1. The utility model provides a water blocking device that water is gushed to steel sheet pile cofferdam gap, comprises the steel sheet pile, its characterized in that: the water blocking device for the gap water burst of the steel sheet pile cofferdam comprises a gap inflation water blocking structure or an inflation extrusion inner water blocking structure.

2. The apparatus of claim 1, wherein: the gap inflation water shutoff structure is composed of a groove and an inflatable bag, the groove is longitudinally arranged at the lock catch of the steel sheet pile, and the inflatable bag is arranged in the groove.

3. The apparatus of claim 2, wherein: the upper side end and the lower side end of the groove are arranged at intervals from the corresponding positions of the upper end face and the lower end face of the steel sheet pile, the opening end of the groove is located on the corresponding steel sheet pile face, an inflatable bag is arranged in the groove, one end of the inflatable bag is provided with an air injection port, the air injection port is located in a top groove at the upper end of the steel sheet pile, and the bottom end of the inflatable bag is located in a bottom groove at the lower end of the steel sheet pile.

4. The apparatus of claim 2 or 3, wherein: the opening end of the groove is positioned on the corresponding steel plate pile surface, or the opening end of the groove is provided with a sealing cover, and the outer end surface of the sealing cover and the corresponding steel plate pile surface are in the same plane.

5. The apparatus of claim 1, wherein: the gap inflation water shutoff structure is composed of an inflation bag, the inflation bag is longitudinally arranged at the lock catch of the steel sheet pile, one end of the inflation bag is provided with an air injection port, and the outer end of the inflation bag is provided with a protective layer.

6. The apparatus of claim 5, wherein: the protective layer is made of a wear-resistant and extrusion-resistant synthetic thin plastic film, and adhesive layers attached to the corresponding steel plate pile faces are arranged at the inner end edges of the two sides of the protective layer.

7. The apparatus of claim 1, wherein: the gap inflation water shutoff structure is an expansion bag, the expansion bag is longitudinally arranged at a lock catch of the steel sheet pile, the outer end face of the expansion bag is made of a wear-resistant and extrusion-resistant synthetic thin plastic film, the inner end face of the expansion bag is made of an elastic material or made of a wear-resistant and extrusion-resistant synthetic thin plastic film, four sides of the inner end face and the outer end face of the expansion bag are hermetically connected to form the expansion bag of the hollow part, an injection opening is formed in one end of the expansion bag and communicated with the interior of the hollow part, an adhesive layer attached to the steel sheet pile face is arranged on the outer side of the inner end face of the expansion bag, and an anti-sticking film layer is arranged on the outer end face of the adhesive layer.

8. The apparatus of claim 1, wherein: the inflatable extrusion internal water plugging structure consists of a U-shaped steel plate, an extrusion plate, a water stop, a screw, a plurality of internal thread holes and a handle, wherein two ends of the U-shaped steel plate are respectively arranged on two adjacent steel plate piles at the water leakage position of the lock catch;

or the inflatable extrusion inner water plugging structure consists of a U-shaped steel plate and an inflatable bag, two ends of the U-shaped steel plate are respectively arranged on two adjacent steel plate piles at the water leakage position of the lock catch, the inflatable bag is arranged in the U-shaped steel plate, one end of the inflatable bag is provided with a gas injection port, and the gas injection port is positioned outside the U-shaped steel plate.

9. A method for plugging water in a gap of a steel sheet pile cofferdam by using the apparatus of claim 1, comprising the steps of:

(1) preparing a gap inflation water plugging structure or an inflation extrusion internal water plugging structure;

(2) the following method can be selected for water plugging of the gap water burst of the steel sheet pile cofferdam by using the gap inflation water plugging structure;

(a) using an expansion bag: removing the anti-sticking film layer outside the adhesive layer, longitudinally attaching the expansion bag to the lock catch at one side of the steel sheet pile through the adhesive layer, wherein an injection opening of the expansion bag is positioned on the water surface at the upper end of the steel sheet pile after the pile is formed, and the lower end of the expansion bag is positioned in a river bed which is 1-1.5 m below the lower waterline of the steel sheet pile after the pile is formed or is positioned at the lower part of the steel sheet pile after the pile is formed;

only one expansion bag is needed to be arranged at the lock catch of the adjacent steel sheet pile, the steel sheet pile and the adjacent steel sheet pile are driven into the steel sheet pile to form a steel sheet pile cofferdam, construction in the cofferdam is carried out, if water leaks from the lock catch of the steel sheet pile, gas or liquid is injected into the expansion bag positioned at the water leaking lock catch through an injection opening to enable the expansion bag to expand to block a water leaking gap at the lock catch of the steel sheet pile, the water leaking is blocked, the water blocking of water gushing from the gap of the steel sheet pile cofferdam is completed, and then the injection opening is closed;

(b) using an inflatable bag: an inflatable bag is longitudinally arranged at the lock catch where the steel sheet piles are butted, an air injection port is arranged at one end head of the inflatable bag, a protective layer is arranged at the outer end of the inflatable bag, the protective layer is made of a wear-resistant and extrusion-resistant synthetic thin plastic film, and adhesive layers attached to the corresponding steel sheet pile surfaces are arranged at the inner end edges of two sides of the protective layer; longitudinally attaching adhesive layers on two sides of the protective layer of the inflatable bag to a lock catch at one side of the steel sheet pile, wherein a gas injection port of the inflatable bag is positioned on the water surface of the upper end of the steel sheet pile after pile forming, and the lower end of the inflatable bag is positioned in a river bed which is 1-1.5 m below the lower waterline of the steel sheet pile after pile forming or is positioned at the lower part of the steel sheet pile after pile forming;

only one inflatable bag needs to be arranged at the lock catch of the adjacent steel sheet pile, the steel sheet pile and the adjacent steel sheet pile are driven into the steel sheet pile to form a steel sheet pile cofferdam, construction in the cofferdam is carried out, if water leaks from the lock catch of the steel sheet pile, gas or liquid is injected into the inflatable bag at the water leakage lock catch through the gas injection port, so that the inflatable bag expands to block a water leakage gap at the lock catch of the steel sheet pile, the water leakage is blocked, the water inrush from the gap of the steel sheet pile cofferdam is blocked, and then the gas injection port is closed;

(c) with the structure of recess and gas cell: a groove is longitudinally formed in the position of a lock catch in butt joint with the steel sheet pile, an inflatable bag is arranged in the groove, the upper side end and the lower side end of the groove are arranged at intervals with the positions corresponding to the upper end face and the lower end face of the steel sheet pile, the opening end of the groove is located on the corresponding steel sheet pile face, the inflatable bag is arranged in the groove, one end of the inflatable bag is provided with an air injection port, the air injection port is located in a top groove at the upper end of the steel sheet pile, and the bottom end of the inflatable bag is located in a bottom groove at the lower end of the steel sheet pile;

only one inflatable bag needs to be arranged at the lock catch of the adjacent steel sheet pile, the steel sheet pile and the adjacent steel sheet pile are driven into the steel sheet pile to form a steel sheet pile cofferdam, construction in the cofferdam is carried out, if water leaks from the lock catch of the steel sheet pile, gas or liquid is injected into the inflatable bag at the water leakage lock catch through the gas injection port to enable the inflatable bag to expand towards the groove, the expansion part blocks the gap of the steel sheet pile at the lock catch, the water leakage is blocked, water blocking of water flowing in the gap of the steel sheet pile cofferdam is completed, and then the gas injection port is closed;

(3) the water plugging structure in the cofferdam by inflation extrusion is used for plugging the water gushing from the gap of the steel sheet pile cofferdam: fixing two end edges of a U-shaped steel plate of a screw on steel plate piles at two sides of a lock catch water gushing position of a steel plate pile in the cofferdam, arranging a water stop at the front end of an extrusion plate in the U-shaped steel plate, supporting the rear end of the extrusion plate by the front end of each screw, and screwing each screw inwards into the U-shaped steel plate, so that the water stop is gradually attached to the water gushing position of the lock catch through the extrusion plate to block external water gushing;

or the two ends of the U-shaped steel plate are respectively arranged on two adjacent steel plate piles at the water leakage position of the lock catch, an inflatable bag is arranged in the U-shaped steel plate, gas or liquid is injected into the inflatable bag positioned in the U-shaped steel plate through the gas injection port to enable the inflatable bag to expand to block the water leakage gap at the lock catch position of the steel plate pile, the water leakage is blocked, the water blocking of water flowing to the gap of the steel plate pile cofferdam is completed, and then the gas injection port is closed.

10. The method of claim 9, wherein: and a gap inflation water plugging structure is arranged at the lock catch of the same side edge of each steel plate pile.

Background

The steel sheet pile is a supporting structure below a river bed formed by continuous and tight occlusion at lock catches positioned at two sides of the steel sheet pile, and the steel sheet pile cofferdam is a temporary closed space enclosed by U-shaped steel sheet piles, so that water and silt can be prevented from flowing into the cofferdam, and the smooth development of the engineering construction (such as bridge piers or bearing platforms) inside the cofferdam can be guaranteed. Usually, the pier or the bearing platform is arranged in a stratum below a river bed, the cofferdam formed by the steel sheet piles with the height of 12m can create ideal construction conditions of the pier or the bearing platform, and the steel sheet pile cofferdam has the advantages of high strength, good waterproof performance, variable shapes, deep water construction and reutilization.

However, in the construction of the steel sheet pile cofferdam, the locking positions of the steel sheet piles above and below the river bed (i.e. the locking seams at the two sides where the steel sheet piles are butted) have water leakage conditions of different degrees, so that the normal construction in the cofferdam can not be realized. The traditional water blocking method for water burst of the steel sheet pile cofferdam gap comprises a series of water blocking modes, such as using fiber-rich cotton wool to block the gap, adopting hemp root mixed with grease to block the gap for water blocking when the two side gaps of the butt joint of the steel sheet piles are wider, or backfilling fine sand or plastic cloth on the outer side of the steel sheet pile to suck the fine sand or the plastic cloth into the locking gap of the steel sheet pile with water leakage through the difference of internal and external water pressure to tightly fill the fine sand or the plastic cloth into the locking gap of the steel sheet pile with water leakage so as to achieve the water blocking effect.

For example, chinese patent publication No. CN101457527A describes that a leakage blocking admixture, coarse sand, sawdust powder, cement, etc., is put down to the upper part to be blocked by a leakage blocking pipe, and the leakage blocking admixture is sucked into a locking seam of a steel sheet pile to be tightly filled, thereby realizing leakage blocking.

For example, chinese patent publication nos. CN111535345A and CN211113691U both disclose that plastic film is laid outside the steel sheet pile cofferdam to cover the whole lock joint of the steel sheet pile for water leakage, thereby achieving leakage stoppage.

The series of water blocking and stopping modes have little effect by adopting a seam plugging mode when facing a large amount of water gushes at the locking part of the steel sheet pile below the riverbed, the traditional seam plugging method by utilizing hemp ropes, canvas and other materials has poor water stopping effect, the plugged hemp ropes, canvas and other materials are easily washed away by the outside gushing water, so that water stopping cannot be carried out, when water stopping cannot be completed, a plurality of water pumps can only be adopted for water pumping operation at the same time, but water seepage in the cofferdam cannot be pumped out, the resource waste is large, and the normal construction in the cofferdam cannot be carried out. At present, the part of the steel sheet pile cofferdam riverbed under water shutoff has no internal advanced mode for reference, and the external grouting water shutoff has high cost, long construction period and difficult construction.

Disclosure of Invention

The invention aims to design a water blocking method and a water blocking device for water gushing of a gap of a steel sheet pile cofferdam, so as to overcome the defects of the prior art.

Therefore, the water plugging device for the water burst of the steel sheet pile cofferdam gap consists of steel sheet piles, and comprises a gap inflation water plugging structure or an inflation extrusion internal water plugging structure.

As a preferred technical scheme of the invention: the gap inflation water shutoff structure is composed of a groove and an inflatable bag, the groove is longitudinally arranged at the lock catch of the steel sheet pile, and the inflatable bag is arranged in the groove. The upper side end and the lower side end of the groove are arranged at intervals from the corresponding positions of the upper end face and the lower end face of the steel sheet pile, the opening end of the groove is located on the corresponding steel sheet pile face, an inflatable bag is arranged in the groove, one end of the inflatable bag is provided with an air injection port, the air injection port is located in a top groove at the upper end of the steel sheet pile, and the bottom end of the inflatable bag is located in a bottom groove at the lower end of the steel sheet pile. The opening end of the groove is positioned on the corresponding steel plate pile surface, or the opening end of the groove is provided with a sealing cover, and the outer end surface of the sealing cover and the corresponding steel plate pile surface are in the same plane.

As a preferred technical scheme of the invention: the gap inflation water shutoff structure is composed of an inflation bag, the inflation bag is longitudinally arranged at the lock catch of the steel sheet pile, one end of the inflation bag is provided with an air injection port, and the outer end of the inflation bag is provided with a protective layer. The protective layer is made of a wear-resistant and extrusion-resistant synthetic thin plastic film, and adhesive layers attached to the corresponding steel plate pile faces are arranged at the inner end edges of the two sides of the protective layer.

As a preferred technical scheme of the invention: the gap inflation water shutoff structure is an expansion bag, the expansion bag is longitudinally arranged at a lock catch of the steel sheet pile, the outer end face of the expansion bag is made of a wear-resistant and extrusion-resistant synthetic thin plastic film, the inner end face of the expansion bag is made of an elastic material or made of a wear-resistant and extrusion-resistant synthetic thin plastic film, four sides of the inner end face and the outer end face of the expansion bag are hermetically connected to form the expansion bag of the hollow part, an injection opening is formed in one end of the expansion bag and communicated with the interior of the hollow part, an adhesive layer attached to the steel sheet pile face is arranged on the outer side of the inner end face of the expansion bag, and an anti-sticking film layer is arranged on the outer end face of the adhesive layer.

As a preferred technical scheme of the invention: the inflatable extrusion internal water plugging structure consists of a U-shaped steel plate, an extrusion plate, a water stop, a screw, a plurality of internal thread holes and a handle, wherein two ends of the U-shaped steel plate are respectively arranged on two adjacent steel plate piles at the water leakage position of the lock catch;

or the inflatable extrusion internal water plugging structure consists of a U-shaped steel plate and an inflatable bag, two ends of the U-shaped steel plate are respectively arranged on two adjacent steel plate piles at the water leakage position of the lock catch, the inflatable bag is arranged in the U-shaped steel plate, one end of the inflatable bag is provided with a gas injection port, and the gas injection port is positioned outside the U-shaped steel plate;

the water plugging method for the water inrush of the gap of the steel sheet pile cofferdam by using the device comprises the following steps:

(1) preparing a gap inflation water plugging structure or an inflation extrusion internal water plugging structure;

(2) the following method can be selected for water plugging of the gap water burst of the steel sheet pile cofferdam by using the gap inflation water plugging structure;

(a) using an expansion bag: removing the anti-sticking film layer outside the adhesive layer, longitudinally attaching the expansion bag to the lock catch at one side of the steel sheet pile through the adhesive layer, wherein an injection opening of the expansion bag is positioned on the water surface at the upper end of the steel sheet pile after the pile is formed, and the lower end of the expansion bag is positioned in a river bed which is 1-1.5 m below the lower waterline of the steel sheet pile after the pile is formed or is positioned at the lower part of the steel sheet pile after the pile is formed;

only one expansion bag is needed to be arranged at the lock catch of the adjacent steel sheet pile, the steel sheet pile and the adjacent steel sheet pile are driven into the steel sheet pile to form a steel sheet pile cofferdam, construction in the cofferdam is carried out, if water leaks from the lock catch of the steel sheet pile, gas or liquid is injected into the expansion bag positioned at the water leaking lock catch through an injection opening to enable the expansion bag to expand to block a water leaking gap at the lock catch of the steel sheet pile, the water leaking is blocked, the water blocking of water gushing from the gap of the steel sheet pile cofferdam is completed, and then the injection opening is closed;

(b) using an inflatable bag: an inflatable bag is longitudinally arranged at the lock catch where the steel sheet piles are butted, an air injection port is arranged at one end head of the inflatable bag, a protective layer is arranged at the outer end of the inflatable bag, the protective layer is made of a wear-resistant and extrusion-resistant synthetic thin plastic film, and adhesive layers attached to the corresponding steel sheet pile surfaces are arranged at the inner end edges of two sides of the protective layer; longitudinally attaching adhesive layers on two sides of the protective layer of the inflatable bag to a lock catch at one side of the steel sheet pile, wherein a gas injection port of the inflatable bag is positioned on the water surface of the upper end of the steel sheet pile after pile forming, and the lower end of the inflatable bag is positioned in a river bed which is 1-1.5 m below the lower waterline of the steel sheet pile after pile forming or is positioned at the lower part of the steel sheet pile after pile forming;

only one inflatable bag needs to be arranged at the lock catch of the adjacent steel sheet pile, the steel sheet pile and the adjacent steel sheet pile are driven into the steel sheet pile to form a steel sheet pile cofferdam, construction in the cofferdam is carried out, if water leaks from the lock catch of the steel sheet pile, gas or liquid is injected into the inflatable bag at the water leakage lock catch through the gas injection port, so that the inflatable bag expands to block a water leakage gap at the lock catch of the steel sheet pile, the water leakage is blocked, the water inrush from the gap of the steel sheet pile cofferdam is blocked, and then the gas injection port is closed;

(c) with the structure of recess and gas cell: a groove is longitudinally formed in the position of a lock catch in butt joint with the steel sheet pile, an inflatable bag is arranged in the groove, the upper side end and the lower side end of the groove are arranged at intervals with the positions corresponding to the upper end face and the lower end face of the steel sheet pile, the opening end of the groove is located on the corresponding steel sheet pile face, the inflatable bag is arranged in the groove, one end of the inflatable bag is provided with an air injection port, the air injection port is located in a top groove at the upper end of the steel sheet pile, and the bottom end of the inflatable bag is located in a bottom groove at the lower end of the steel sheet pile;

only one inflatable bag needs to be arranged at the lock catch of the adjacent steel sheet pile, the steel sheet pile and the adjacent steel sheet pile are driven into the steel sheet pile to form a steel sheet pile cofferdam, construction in the cofferdam is carried out, if water leaks from the lock catch of the steel sheet pile, gas or liquid is injected into the inflatable bag at the water leakage lock catch through the gas injection port to enable the inflatable bag to expand towards the groove, the expansion part blocks the gap of the steel sheet pile at the lock catch, the water leakage is blocked, water blocking of water flowing in the gap of the steel sheet pile cofferdam is completed, and then the gas injection port is closed;

(3) the water plugging structure in the cofferdam by inflation extrusion is used for plugging the water gushing from the gap of the steel sheet pile cofferdam: fixing two end edges of a U-shaped steel plate of a screw on steel plate piles at two sides of a lock catch water gushing position of a steel plate pile in the cofferdam, arranging a water stop at the front end of an extrusion plate in the U-shaped steel plate, supporting the rear end of the extrusion plate by the front end of each screw, and screwing each screw inwards into the U-shaped steel plate, so that the water stop is gradually attached to the water gushing position of the lock catch through the extrusion plate to block external water gushing;

or the two ends of the U-shaped steel plate are respectively arranged on two adjacent steel plate piles at the water leakage position of the lock catch, an inflatable bag is arranged in the U-shaped steel plate, gas or liquid is injected into the inflatable bag positioned in the U-shaped steel plate through the gas injection port to enable the inflatable bag to expand to block the water leakage gap at the lock catch position of the steel plate pile, the water leakage is blocked, the water blocking of water flowing to the gap of the steel plate pile cofferdam is completed, and then the gas injection port is closed.

As a preferred technical scheme of the invention: and a gap inflation water plugging structure is arranged at the lock catch of the same side edge of each steel plate pile.

The above-described apparatus and method achieve the objects of the present invention.

Compared with the prior art, the invention has the following advantages and positive effects:

(1) the invention has better water-blocking effect, because the water leakage condition of the steel sheet pile cofferdam only exists at the locking position of the steel sheet pile, the invention arranges an inflatable bag or an expansion bag at the locking position of the steel sheet pile, the inflatable bag or the expansion bag is implanted into the same-position riverbed or river along with the steel sheet pile, if the locking position of the steel sheet pile leaks water, gas or liquid is injected into the inflatable bag or the expansion bag which is positioned at the locking position and leaks water through the gas injection port, so that the inflatable bag or the expansion bag expands towards the locking position to block the gap at the locking position of the steel sheet pile, thereby realizing the blocking of the water leakage. The water plugging structure can also be used for plugging water gushing from the gaps of the steel sheet pile cofferdam in the cofferdam by inflating and extruding the inner water plugging structure.

Practice shows that: the invention is characterized in that the full bridge length of a bridge on a river valley Hanjiang highway is 4701m, and the bridge comprises an old river mouth side approach bridge, a main bridge, a cross-dike hole bridge and a valley city side approach bridge, wherein the main bridge length is 420m, and the underwater bearing platform construction of the main bridge adopts the design construction of a steel sheet pile cofferdam; and the steel sheet pile cofferdams of the 22#, 23#, 24# piers of the main bridge select Larsen IVw type steel sheet piles with better stress, and in the construction of the steel sheet pile cofferdams of Larsen IV type project for the No. 25 pier, the steel sheet pile locking positions above and below the riverbed have the leakage conditions of different degrees, and by adopting the invention, a large amount of water burst at the steel sheet pile locking positions above and below the riverbed is successfully stopped, and the smooth operation in the cofferdam is ensured.

(2) The invention has novel and simple structure and design, good use effect, low water plugging cost and quick water stopping. The invention has low manufacturing cost, the cost of the inflatable bag and the expansion bag is only tens of yuan, and the inflatable extrusion inner water plugging structure can be processed by waste materials or leftover materials. The invention does not need special equipment, has simple operation, good use effect, low water plugging cost and quick water stopping.

(3) The invention can reduce the safety risk of cofferdam construction, the device and the method can greatly and rapidly block the water leakage at the lock catch positions above and below the riverbed, the water-stopping effect is good, after a large amount of water gushes are successfully blocked, the water leakage in the cofferdam can be pumped out by only using 1 water pump for operation, and constructors can normally operate in the cofferdam. The traditional seam plugging method by utilizing the hemp ropes, the canvas and other materials is poor in water stopping effect, the plugged hemp ropes, the canvas and other materials are easily washed away by outside water burst, water stopping cannot be conducted, when water stopping cannot be completed, seepage in the cofferdam cannot be drained by adopting a plurality of water pumps to operate simultaneously, resource waste is large, and normal construction cannot be conducted in the cofferdam. Compared with the conventional plugging method, the method has the advantages of more obvious water stopping effect, higher practicability, construction resource saving, quick completion of water stopping, guarantee of normal construction operation in the cofferdam and acceleration of construction progress of underwater engineering. The invention has low implementation cost and short time for equipment arrangement, and can greatly improve the construction speed and reduce the construction cost.

Drawings

FIG. 1 is a partial enlarged structural schematic view of a conventional steel sheet pile cofferdam and a lock catch;

FIG. 2 is a schematic view of the groove and the airbag of the present invention in use;

FIG. 3 is a schematic view of the construction of the groove and the airbag of the present invention;

FIG. 4 is a schematic structural view showing the distribution of the grooves and the air bags according to the present invention;

FIG. 5 is a schematic structural view of the balloon of the present invention;

FIG. 6 is a schematic view of the construction of the covered recess and bladder of the present invention;

FIG. 7 is a schematic view of the structure of the airbag and protective layer of the present invention;

FIG. 8 is a schematic view of the structure of the present invention showing the distribution of the airbag and the protective layer;

FIG. 9 is a schematic view of the construction of the inflation bladder of the present invention;

FIG. 10 is a schematic view of the state structure of the blocking lock of the present invention;

FIG. 11 is a schematic view of an inflatable squeeze internal water shutoff structure of the present invention;

fig. 12 is a schematic view of the use state of the inflatable extrusion internal water plugging structure of the invention.

Wherein: 1. steel sheet piles; 2. locking the position; 3. a groove; 4. an air-filled bag; 5. sealing the cover; 6. an inflation inlet; 7. a protective layer; 8. an adhesive layer; 9. an inner end face of the expansion bag; 10. the outer end face of the expansion bag; 11. an anti-adhesive film layer; 12. a U-shaped steel plate; 13. a handle; 14. a screw; 15. an internally threaded bore; 16. a pressing plate; 17. a water stop.

Detailed Description

The present invention will be further described with reference to specific embodiments for the purpose of facilitating an understanding of technical means, characteristics of creation, objectives and functions realized by the present invention, but the following embodiments are only preferred embodiments of the present invention, and are not intended to be exhaustive. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative efforts belong to the protection scope of the present invention. The experimental methods in the following examples are conventional methods unless otherwise specified, and materials, devices, equipments, reagents and the like used in the following examples are commercially available unless otherwise specified.

As shown in fig. 1 to 12, the water shutoff device for the water burst of the gap of the steel sheet pile cofferdam consists of a steel sheet pile 1, and comprises a gap inflation water shutoff structure or an inflation extrusion internal water shutoff structure. The gap inflation water plugging structure or the inflation extrusion inner water plugging structure can be used independently, and can also be used together for plugging water gushing from the gap of the steel sheet pile cofferdam.

Example 1: as shown in fig. 1 to 6, the gap inflation water shutoff structure is composed of a groove 3 and an inflation bag 4, the groove 3 is longitudinally arranged at a lock catch 2 where steel sheet piles 1 are butted, the inflation bag 4 is arranged in the groove, and the groove is used for protecting the inflation bag and preventing the inflation bag from being damaged when the piles are planted.

The upper side end and the lower side end of the groove are arranged at intervals corresponding to the upper end face and the lower end face of the steel sheet pile 1, namely the upper end face and the lower end face of the groove are respectively 5-10 cm away from the upper end face and the lower end face of the steel sheet pile, so that the inflatable bag is prevented from being damaged when the pile is planted.

The opening end of the groove is positioned on the corresponding steel plate pile surface and can be positioned on the steel plate pile surface of the locking part 2 at any side. Experiments show that the diameter of the inflated airbag can effectively block the water leakage of the gap at the locking position of the steel sheet pile after being expanded by 2-8 cm, so that the width of the opening end of the groove can be 0.5-0.8 cm, namely the width of the opening end is the best and is smaller than the thickness of the steel sheet pile, the inflatable airbag is arranged in the groove, one end of the inflatable airbag is provided with a gas injection port 6, the gas injection port 6 is positioned in a top groove at the upper end of the steel sheet pile, and the bottom end of the inflatable airbag extends and is positioned in a bottom groove at the lower end of the steel sheet pile. The size of the groove is suitable for being placed into the inflatable bag, and the width of the opening end of the groove is based on the fact that the inflatable bag can be flushed out of the groove from the opening end after being expanded to effectively block the gap water leakage at the lock catch of the steel sheet pile.

The opening end of the groove is positioned on the corresponding steel plate pile surface, a sealing cover 5 can be arranged at the opening end of the groove for protecting the inflatable bag, the groove is rectangular at the moment, the rear inner parts of two side edges of the sealing cover 5 are propped against the bottom surface of the groove, and the outer end surface of the sealing cover and the corresponding steel plate pile surface are in the same plane.

The inflatable bag is made of thin elastic materials or compression-resistant and wear-resistant synthetic plastics, the thickness of the inflatable bag is 0.02-0.08 mm, and the compression-resistant and wear-resistant synthetic plastics can be PE, PPS, PPSU and the like, or engineering plastics reinforced by glass fibers or carbon fibers.

The lock catches on the same side of each steel sheet pile are provided with a gap inflation water shutoff structure, namely, the lock catches on the same side of the steel sheet piles are only provided with the gap inflation water shutoff structures, so that the lock catches of each steel sheet pile are provided with one gap inflation water shutoff structure after the cofferdam is formed, and water leakage at any lock catch is blocked.

As shown in fig. 2 and 10, in use, the inflatable bags for preparing the gap inflatable water shutoff structure and the grooves at the locking parts on the same side of each steel sheet pile are prepared, that is, only one groove 3 and one inflatable bag 4 need to be arranged at the locking parts of adjacent steel sheet piles. And (3) driving the steel sheet piles and the adjacent steel sheet piles into the steel sheet pile cofferdam to form the steel sheet pile cofferdam, performing construction in the cofferdam, if water leaks from the lock catches of the steel sheet piles, injecting gas or liquid into the inflatable bags positioned at the water leakage lock catches through the gas injection ports to enable the inflatable bags to expand outwards from the grooves, punching the grooves or punching the sealing covers 5 for sealing the opening ends of the grooves, blocking the water leakage gaps at the lock catches of the steel sheet piles by the expanded inflatable bags, realizing the blocking of water leakage, completing the water blocking of water flowing in the gaps of the steel sheet pile cofferdam, and then sealing the gas injection ports.

Example 2: as shown in fig. 7 and 8, different from embodiment 1, the gap inflation water shutoff structure may not have a groove, but only consist of the inflatable bag 4, or only have a shallow semicircular groove according to the thickness of the inflatable bag and the protective layer 7, the inflatable bag is longitudinally arranged at the lock catch 2 of the steel sheet pile, or in the shallow semicircular groove, one end of the inflatable bag is provided with an air injection port 6, and the outer end of the inflatable bag 4 is provided with the protective layer 7. The protective layer 7 is made of a wear-resistant and extrusion-resistant synthetic thin plastic film such as PE, PPS, PPSU, etc.; the inner end edges of the two sides of the protective layer are provided with adhesive layers 8 which are attached to the corresponding steel plate pile surfaces. The adhesive layers of the inflatable bag passing through the two sides of the protective layer can be longitudinally attached to the lock catch at one side of the steel sheet pile or sealed in the shallow semicircular groove at the lock catch. And the gas injection port of the gas-filled bag is positioned on the water surface of the upper end of the steel sheet pile after the pile is formed, and the lower end of the gas-filled bag is positioned in a river bed which is 1-1.5 m below the waterline of the lower part of the steel sheet pile after the pile is formed or is positioned at the lower part of the steel sheet pile after the pile is formed.

As shown in fig. 10, when in use, only one air bag needs to be arranged at the lock catch of the adjacent steel sheet pile, the steel sheet pile and the adjacent steel sheet pile are driven into the lock catch to form the steel sheet pile cofferdam, the cofferdam is constructed, if water leaks from the lock catch of the steel sheet pile, gas or liquid is injected into the air bag at the water leaking lock catch through the air injection port to enable the air bag to expand to block the water leaking gap at the lock catch of the steel sheet pile, so that the water leaking is blocked, the water flowing from the gap of the steel sheet pile cofferdam is blocked, and then the air injection port is closed.

Example 3: as shown in fig. 9, unlike embodiment 2, the gap water-filling and water-stopping structure is an expansion bag, the expansion bag is longitudinally arranged at the lock catch of the steel sheet pile, the outer end surface 10 of the expansion bag is made of a wear-resistant and extrusion-resistant synthetic thin plastic film, and the inner end surface 9 of the expansion bag is made of an elastic material or a wear-resistant and extrusion-resistant synthetic thin plastic film. The four sides of the inner end surface and the outer end surface of the expansion bag are hermetically connected to form the expansion bag with a hollow part, and one end of the expansion bag is provided with an injection port communicated with the hollow part. The outer side of the inner end face of the expansion bag is provided with an adhesive layer 8 attached to the pile face of the steel plate, and the outer end face of the adhesive layer is provided with an anti-sticking film layer 11, such as anti-sticking paper, plastic cloth and the like, for protecting the adhesive layer 8. The adhesive layer 8 is made of biological glue, epoxy resin glue, organic silicon gel and the like.

When the anti-sticking film layer 11 is used, the outside of the adhesive layer is removed, the expansion bag is longitudinally attached to the lock catch on one side of the steel sheet pile through the adhesive layer, the injection port of the expansion bag is positioned on the water surface of the upper end of the steel sheet pile after pile forming, and the lower end of the expansion bag is positioned in a river bed which is 1-1.5 m below the lower waterline of the steel sheet pile after pile forming or is positioned at the lower part of the steel sheet pile after pile forming. The lock catch of the adjacent steel sheet pile only needs to arrange an expansion bag, the steel sheet pile and the adjacent steel sheet pile are driven into the lock catch to form a steel sheet pile cofferdam, construction in the cofferdam is carried out, if the lock catch of the steel sheet pile leaks water, gas or liquid is injected into the expansion bag positioned at the leaking lock catch through the filling opening to enable the expansion bag to expand to block a water leakage gap at the lock catch of the steel sheet pile, the water leakage is blocked, water blocking of water gushing from the gap of the steel sheet pile cofferdam is completed, and then the filling opening is closed.

Example 4: as shown in fig. 11 to 12, the difference from the embodiment 1 is that the air-inflation extrusion inner water plugging structure is used for plugging water gushing from the gap of the steel sheet pile cofferdam in the cofferdam. The inflatable extrusion internal water plugging structure consists of a U-shaped steel plate 12, an extrusion plate 16, a water stop belt 17, a screw 14, an internal threaded hole 15 and a handle 13. The two ends of the U-shaped steel plate are respectively arranged on two adjacent steel sheet piles at the water leakage position of the lock catch, namely the two end edges of the U-shaped steel plate 12 with the screw rods 14 fixed on the steel sheet piles at the two sides of the water burst position of the lock catch of the steel sheet pile in the cofferdam are fixed in a welding, inserting and clamping mode (clamping lugs are arranged on the steel sheet piles and the like) which is the traditional technology, so the description is not repeated. A plurality of internal thread holes 15 are arranged in the longitudinal middle of the U-shaped steel plate at intervals, each screw 14 is respectively screwed in each internal thread hole 15, an extrusion plate 16 is arranged in the U-shaped steel plate, a water stop 17 is arranged in the U-shaped steel plate at the front end of the extrusion plate, and the water stop 1 is made of rubber or felt blocks. The front ends of the screws in the U-shaped steel plates respectively prop against the rear end faces of the extrusion plates of the corresponding parts, and the rear ends of the screws outside the U-shaped steel plates are provided with handles 13.

When the cofferdam is used, the steel sheet piles at two sides of the water gushing position of the lock catch of the steel sheet pile in the cofferdam are fixed with two end edges of the U-shaped steel sheet of the screw, the front end of the extrusion plate in the U-shaped steel sheet is provided with the water stop, the front end of each screw props against the rear end of the extrusion plate, the handle 13 is rotated to inwards screw each screw 14 into the U-shaped steel sheet, so that the water stop 17 is gradually attached to the water gushing position of the lock catch through the extrusion plate 16 to block external water gushing.

Example 5: as shown in fig. 11 to 12, different from embodiment 4, two ends of the U-shaped steel plate 12 are respectively disposed on two adjacent steel plate piles at the water leakage position of the lock catch, the U-shaped steel plate 12 may be a strip-shaped semi-cylindrical groove, and the fixing manner, such as welding, inserting and clamping (providing a clamping lug on the steel plate pile) is a conventional technique, so that the description is not repeated. An inflatable bag is arranged in the U-shaped steel plate.

When the device is used, gas or liquid is injected into the inflatable bag positioned in the U-shaped steel plate 12 through the gas injection port to enable the inflatable bag to expand to block a water leakage gap at the locking position of the steel plate pile, so that water leakage is blocked, water inrush from the gap of the steel plate pile cofferdam is blocked, and then the gas injection port is closed.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the preferred embodiments of the present invention are described in the above embodiments and the description, and are not intended to limit the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.