1. A water-plugging supporting device for open TBM tunnel construction comprises a steel arch frame (1) for supporting surrounding rocks (9), the grouting device is characterized in that the steel arch frames (1) are annularly arranged in a tunnel, a plurality of bent thin steel plates (2) are arranged between the two steel arch frames (1), the thin steel plates (2) are fixed on the lower portions of flange plates of the steel arch frames (1) through pressing strips (4), rubber plates (3) used for sealing are arranged at the joints of the thin steel plates (2) and the flange plates of the steel arch frames (1), the pressing strips (4) and the steel arch frames (1) are detachably connected through studs (7), sealed grouting spaces are formed between the thin steel plates (2) and surrounding rocks (9) after installation, grouting pipes (6) are arranged on the thin steel plates (2), the grouting pipes (6) are communicated with the grouting spaces, and concrete layers (11) are sprayed in the spaces below the thin steel plates (2) and the steel arch frames (1).

2. The water plugging support device for the construction of the open type TBM tunnel according to claim 1, wherein the steel arch (1) is made of H-shaped steel, the stud (7) is welded and fixed at the lower part of the flange plate of the H-shaped steel, the rubber plate (3) is bonded at the lower part of the flange plate of the H-shaped steel, and the single steel arch (1) is spliced into a ring shape through a plurality of H-shaped steel splicing sections formed by bending.

3. The water plugging support device for the construction of the open TBM tunnel according to claim 2, wherein connecting holes matched with the studs (7) are formed in two ends of the pressing bar (4), the studs (7) penetrate through the connecting holes of the pressing bar (4), the lower ends of the studs are fixed through nuts, and the pressing bar (4) is located at the joint of the two thin steel plates (2).

4. The water plugging and supporting device for the open type TBM tunnel construction according to claim 3, wherein a plurality of grabbing ribs (5) for reinforcing the sprayed concrete layer (11) are arranged at the lower part of the thin steel plate (2).

5. The water plugging support device for the open TBM tunnel construction according to claim 4, wherein a chemical grouting hole (8) is formed in the thin steel plate (2), and the grouting pipe (6) is welded and fixed at the chemical grouting hole (8).

6. The construction method of the water plugging support device for the construction of the open type TBM tunnel according to any one of claims 1 to 5, which comprises the steps of,

the method comprises the following steps that firstly, a plurality of thin steel plates (2) are prepared to be bent, chemical grouting holes (8) are formed in the thin steel plates (2), grouting pipes (6) are welded in the chemical grouting holes (8), and a plurality of grabbing ribs (5) are welded on the inner sides of the thin steel plates (2);

welding (7) studs on the inner sides of the splicing sections of the steel arches (1), wherein the splicing sections of the steel arches (1) are formed by pressing H-shaped steel, the studs (7) are welded and fixed on the lower portions of flange plates of the H-shaped steel, and rubber plates (3) are bonded on the lower portions of the flange plates of the H-shaped steel;

splicing the steel arch frames (1) into a ring in the tunnel, wherein each ring-shaped steel arch frame (1) is supported in the tunnel;

fourthly, a thin steel plate (2) is installed between two steel arch frames (1), the thin steel plate (2) is attached to a rubber plate (3) of a flange plate of the steel arch frame (1) and is fixed by a pressing strip (4), the pressing strip (4) is located at the joint of the two thin steel plates (2), a stud (7) penetrates through a connecting hole of the pressing strip (4), the lower end of the stud is fixed through a nut, and the stud is fixed for one circle in a reciprocating mode;

fifthly, spraying concrete on the thin steel plates (2) between the steel arch frames (1), after the spraying is finished, the sprayed concrete is solidified below the thin steel plates (2), and forms a sprayed concrete layer (11) together with the grab ribs (5);

sixthly, pouring a chemical grouting material (10) into the chemical grouting space between the thin steel plate (2) and the surrounding rock (9) through a grouting pipe (6);

and seventhly, repeating the steps, and constructing in the tunnel by adopting the water plugging support device according to the steps to achieve the purposes of plugging and reinforcing the broken water burst points of the surrounding rock (9).

7. The construction method of the water plugging support device for the open type TBM tunnel construction according to the claim 6 is characterized in that in the fourth step, when the thin steel plate (2) is installed on the steel arch (1), the middle part of the steel arch (1) is a TBM horizontal support area (12), the thin steel plate (2) is not installed in the TBM horizontal support area (12) firstly, so that the thin steel plate (2) at the horizontal support position is prevented from being deformed by horizontal support pressure during TBM tunneling; if the surrounding rock (9) is very broken and gushes water, the horizontal support cannot support the rock surface, and concrete is lined at the position; if the surrounding rock (9) is relatively complete, after the TBM is tunneled and step-changed to horizontally support the area without the thin steel plate (2), the thin steel plate (2) is installed at the TBM horizontal support area (12).

8. The construction method of the water plugging support device for the open-type TBM tunnel construction according to claim 6, wherein in the sixth step, when consolidation grouting needs to be further performed on the inside of the surrounding rock (9), consolidation grouting holes are drilled through the grouting pipe (6), and then consolidation grouting is performed on the surrounding rock (9).

Background

The TBM is a full-face tunnel boring machine, the hard rock TBM is a hard rock TBM which utilizes a hob on a rotary cutter disc to extrude and shear broken rocks, picks up rock debris through dipper teeth on the rotary cutter disc, falls into a main belt conveyor to be conveyed backwards, and then transports the rock debris out of the tunnel through a traction slag car or a tunnel continuous belt conveyor; the open type TBM tunnel boring machine does not need to lay segments when a tunnel is excavated, integrates excavation, supporting and slag tapping, can realize one-step forming of the tunnel, and is mainly applied to construction of long and large hard rock tunnels.

In an open type TBM tunnel, when surrounding rocks are broken and a large amount of water gushes during tunneling, supporting and water plugging are very troublesome, firstly, a hanging net, anchor rods, reinforcing steel bars and steel arches are generally adopted for supporting, but due to the fact that the surrounding rocks are broken and rich in water, holes are not formed in anchor rod holes easily, a large amount of water gushes out in the holes, the anchor rods cannot be anchored, and the surrounding rocks are prone to collapse. When water is blocked for broken surrounding rocks, grout can be diffused everywhere along broken cracks of the surrounding rocks, most of the grout can flow into a tunnel, the water blocking effect is very poor, the broken cracks of the surrounding rocks are blocked through chemical grouting in the prior art, the method is characterized in that a plurality of points are wide, time is consumed, materials are wasted, the blocking effect is poor, and in addition, the water blocking process is broken due to the surrounding rocks, and even if supporting measures such as reinforcing steel bar rows and the like are provided, the danger that people are injured due to chipping is caused.

Disclosure of Invention

The invention aims to solve the problems in the prior art, and provides a water plugging support device for open type TBM tunnel construction and a construction method thereof, wherein the device aims to solve the technical problems that: how to realize providing good supporting construction when open-type TBM tunnel construction has good water shutoff effect simultaneously.

The purpose of the invention can be realized by the following technical scheme:

a water-plugging supporting device for open TBM tunnel construction comprises steel arch frames for supporting surrounding rocks, wherein the steel arch frames are annularly arranged in a tunnel, a plurality of bent thin steel plates are arranged between the two steel arch frames, the thin steel plates are fixed on the lower portions of flange plates of the steel arch frames through pressing strips, rubber plates for sealing are arranged at the joints of the thin steel plates and the flange plates of the steel arch frames, the pressing strips and the steel arch frames are detachably connected through studs, sealed grouting spaces are formed between the thin steel plates and the surrounding rocks after the thin steel plates are installed, grouting pipes are arranged on the thin steel plates and communicated with the grouting spaces, and the lower portions of the thin steel plates and the steel arch frames are sprayed with concrete layers.

Preferably, the steel arch frame is made of H-shaped steel, the stud is welded and fixed to the lower portion of the flange plate of the H-shaped steel, the rubber plate is bonded to the lower portion of the flange plate of the H-shaped steel, and the single steel arch frame is spliced into a ring through a plurality of bent H-shaped steel splicing sections.

By adopting the structure, the rubber plate is used for sealing and stopping water, the sealing performance of the chemical irrigation space is ensured, the thin steel plate and the pressing strip are fixed through the stud, the operation is convenient, and the connection is reliable.

Connecting holes matched with the studs are formed in the two ends of the pressing strip, the studs penetrate through the connecting holes of the pressing strip, the lower ends of the studs are fixed through nuts, and the pressing strip is located at the joint of the two thin steel plates.

After the steel arch frames are spliced into a ring, the bent thin steel plate is attached to the rubber plate of the flange plate of the steel arch frame, the thin steel plate is fixed by the pressing strip, the welding stud and the nut, the thin steel plate is fixed for a circle in a reciprocating mode, the seam between the thin steel plate block and the thin steel plate block is located at the pressing strip, the thin steel plate is fixed on the steel arch frame by the pressing strip, and meanwhile two steel arch frames can be connected to strengthen the stability of a supporting structure.

And the lower part of the thin steel plate is provided with a plurality of grabbing ribs for reinforcing the sprayed concrete layer.

By adopting the structure, after the thin steel plate is installed, concrete is sprayed below the thin steel plate, and after the spraying is finished, the sprayed concrete is solidified on the thin steel plate and forms a reinforced concrete layer together with the grab bars, so that the supporting strength and the stability of the supporting structure are enhanced.

And the thin steel plate is provided with chemical grouting holes, and the grouting pipes are welded and fixed at the chemical grouting holes.

By adopting the structure, the chemical grouting material is poured into the chemical grouting space between the thin steel plate and the surrounding rock through the grouting pipe, the chemical grouting material is chemical slurry for water plugging, the chemical grouting material enters the rear surface of the thin steel plate to react, the purpose of plugging cracks of the rock surface and gushing water is achieved, the gushing water of the surrounding rock surface is plugged, and meanwhile, the surrounding rock can be punched through the grouting pipe to be solidified and grouted, so that the surrounding rock is reinforced.

A construction method of a water plugging support device for open TBM tunnel construction comprises the following steps,

the method comprises the following steps of preparing a plurality of thin steel plates to be bent, forming chemical grouting holes in the thin steel plates, welding grouting pipes in the chemical grouting holes, and welding a plurality of grabbing ribs on the inner sides of the thin steel plates.

And secondly, welding studs on the inner sides of the steel arch splicing sections, wherein the steel arch splicing sections are formed by pressing H-shaped steel, the studs are welded and fixed on the lower parts of the flange plates of the H-shaped steel, and rubber plates are bonded on the lower parts of the flange plates of the H-shaped steel.

And step three, splicing the steel arch frames into a ring in the tunnel, wherein each ring-shaped steel arch frame is supported in the tunnel.

Fourthly, a thin steel plate is installed between the two steel arches, the thin steel plate is attached to a rubber plate of a flange plate of the steel arch and is fixed by a pressing strip, the pressing strip is located at the joint of the two thin steel plates, a stud penetrates through a connecting hole of the pressing strip, the lower end of the stud is fixed by a nut, and the stud is fixed for a circle in a reciprocating mode; when the thin steel plate is installed behind the shield body, the middle part of the steel arch is a TBM horizontal supporting area, and the thin steel plate is not installed in the TBM horizontal supporting area, so that the thin steel plate at the horizontal supporting position is prevented from being deformed by horizontal supporting pressure during TBM tunneling; if the surrounding rock is broken and gushes water, the horizontal support cannot support the rock surface, and concrete can be lined at the position; if the surrounding rock is relatively complete, after the TBM is tunneled and step-changed to horizontally support the area without the thin steel plate, the thin steel plate is installed at the horizontal support area of the TBM.

And fifthly, spraying concrete on the thin steel plates among the steel arches, solidifying the sprayed concrete below the thin steel plates after spraying is finished, forming a sprayed concrete layer together with the grab bars, and enabling the solidified concrete structure layer to strengthen the supporting strength and stability of the supporting structure.

And step six, pouring a chemical grouting material into the chemical grouting space between the thin steel plate and the surrounding rock through the grouting pipe, wherein the chemical grouting material enters the rear surface of the thin steel plate to react, so that the purpose of blocking water gushing from rock surface cracks is achieved, the water gushing from the surrounding rock surface is blocked, and a good water plugging effect is achieved. If the inside of the surrounding rock is further subjected to consolidation grouting, a consolidation grouting hole can be punched through a grouting pipe, and then the surrounding rock is subjected to consolidation grouting.

And seventhly, repeating the steps, and constructing in the tunnel by adopting the water plugging support device according to the steps to achieve the purposes of plugging and reinforcing the broken water burst points of the surrounding rock.

Compared with the prior art, the water plugging support device for the open type TBM tunnel construction and the construction method thereof have the following advantages:

1. the water plugging support device can play a good support role in a tunnel through an annular support structure formed by matching the arch frames, the thin steel plates and the pressing strips, after the installation is completed, concrete is sprayed on the thin steel plates among the steel arch frames, after the spraying is completed, the sprayed concrete is solidified below the thin steel plates and forms a sprayed concrete layer together with the grab bars, and the solidified concrete structure layer can strengthen the support strength and the stability of the support structure; and then, grouting a grouting material into the grouting space between the thin steel plate and the surrounding rock through the grouting pipe so as to plug water gushing on the surrounding rock surface and achieve a good water plugging effect.

2. The water plugging support device is adopted during the construction of the open type TBM tunnel, the operation is simple, the construction is convenient, the support stability is good, the structural strength is high, the collapse of the tunnel roof and surrounding rocks on two sides can be prevented, the good water plugging effect is achieved, the construction efficiency can be improved, the construction cost is reduced, and the safety protection performance of the support structure is improved.

Drawings

FIG. 1 is a schematic view of the present invention after installation;

FIG. 2 is a schematic structural view of the present invention;

FIG. 3 is a schematic structural view of section A in FIG. 2;

FIG. 4 is an enlarged schematic view of section I of FIG. 3;

FIG. 5 is a schematic structural view of the present invention in a horizontal supporting state;

in the figure: 1-steel arch frame, 2-thin steel plate, 3-rubber plate, 4-layering, 5-grabbing rib, 6-grouting pipe, 7-stud, 8-grouting hole, 9-surrounding rock, 10-grouting material, 11-sprayed concrete layer and 12-TBM horizontal supporting area.

Detailed Description

The technical solution of the present patent will be described in further detail with reference to the following embodiments.

Reference will now be made in detail to embodiments of the present patent, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present patent and are not to be construed as limiting the present patent.

In the description of this patent, it is to be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for the convenience of describing the patent and for the simplicity of description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the patent.

In the description of this patent, it is noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "disposed" are to be construed broadly and can include, for example, fixedly connected, disposed, detachably connected, disposed, or integrally connected and disposed. The specific meaning of the above terms in this patent may be understood by those of ordinary skill in the art as appropriate.

Referring to fig. 1-5, the embodiment provides a water plugging support device for open type TBM tunnel construction and a construction method thereof, and the water plugging support device comprises steel arch frames 1 for supporting surrounding rocks 9, the steel arch frames 1 are annularly arranged in a tunnel, a plurality of bent thin steel plates 2 are arranged between the two steel arch frames 1, the thin steel plates 2 are fixed at the lower parts of flange plates of the steel arch frames 1 through pressing strips 4, rubber plates 3 for sealing are arranged at the joints of the thin steel plates 2 and the flange plates of the steel arch frames 1, the pressing strips 4 are detachably connected with the steel arch frames 1 through studs 7, sealed grouting spaces are formed between the thin steel plates 2 and the surrounding rocks 9 after the thin steel plates 2 are installed, grouting pipes 6 are arranged on the thin steel plates 2, the grouting pipes 6 are communicated with the grouting spaces, and the space at the lower parts of the thin steel plates 2 and the steel arch frames 1 is a sprayed concrete layer 11. The annular supporting structure formed by matching the steel arch frames 1, the thin steel plates 2 and the pressing strips 4 can play a good supporting role in a tunnel, after the installation is finished, concrete is sprayed on the thin steel plates 2 among the steel arch frames 1, after the spraying is finished, the sprayed concrete is solidified below the thin steel plates 2 to form a sprayed concrete layer 11 together with the grab bars 5, and the solidified concrete structure layer can strengthen the supporting strength and the stability of the supporting structure; and then, a grouting material 10 is poured into the grouting space between the thin steel plate 2 and the surrounding rock 9 through the grouting pipe 6, so that water gushing on the surrounding rock surface is blocked, and a good water blocking effect is achieved.

Preferably, the steel arch frame 1 is made of H-shaped steel, the stud 7 is welded and fixed at the lower part of a flange plate of the H-shaped steel, the rubber plate 3 is bonded at the lower part of the flange plate of the H-shaped steel, and the single steel arch frame 1 is spliced into a ring shape through a plurality of H-shaped steel splicing sections formed by bending; the rubber plate 3 is used for sealing and stopping water, the sealing performance of the chemical irrigation space is guaranteed, the thin steel plate 2 and the pressing strip 4 are fixed through the stud 7, operation is convenient, and connection is reliable.

Connecting holes matched with the studs 7 are formed in the two ends of the pressing strip 4, the studs 7 penetrate through the connecting holes of the pressing strip 4, the lower end of each stud 7 is fixed through a nut, and the pressing strip 4 is located at the joint of the two thin steel plates 2; after the steel arch centering 1 is spliced into a ring, the bent thin steel plate 2 is attached to a rubber plate 3 of a flange plate of the steel arch centering 1, the thin steel plate 2 is fixed by a pressing strip 4, a welding stud 7 and a nut, the thin steel plate 2 is fixed for a circle in a reciprocating mode, seams among the thin steel plate 2 blocks are located at the pressing strip 4, the thin steel plate 2 is fixed on the steel arch centering 1 by the pressing strip 4, and meanwhile two steel arch centering 1 can be connected to strengthen the stability of a supporting structure.

The lower part of the thin steel plate 2 is provided with a plurality of grab ribs 5 for reinforcing the sprayed concrete layer 11; and after the thin steel plate 2 is installed, spraying concrete below the thin steel plate 2, and after the spraying is finished, the sprayed concrete is solidified on the thin steel plate 2 and forms a reinforced concrete layer together with the grab bar 5, so that the supporting strength and the stability of the supporting structure are enhanced.

The thin steel plate 2 is provided with chemical grouting holes 8, and the grouting pipes 6 are welded and fixed at the chemical grouting holes 8; and (3) pouring a chemical grouting material 10 into the chemical grouting space between the thin steel plate 2 and the surrounding rock 9 through the grouting pipe 6, wherein the chemical grouting material 10 is chemical slurry for water plugging, and the chemical grouting material 10 enters the rear surface of the thin steel plate 2 to react to achieve the purpose of plugging rock surface cracks and gushing water, so that the gushing water on the surrounding rock surface is plugged, and meanwhile, the surrounding rock is perforated through the grouting pipe 6 to be solidified and grouted to reinforce the surrounding rock.

The construction method of the invention comprises the following steps:

the method comprises the steps of preparing a plurality of thin steel plates 2 to be bent, forming chemical grouting holes 8 in the thin steel plates 2, welding grouting pipes 6 in the chemical grouting holes 8, and welding a plurality of grabbing ribs 5 on the inner sides of the thin steel plates 2.

And secondly, welding 7 studs on the inner side of the splicing section of the steel arch frame 1, pressing and forming the splicing section of the steel arch frame 1 by adopting H-shaped steel, welding and fixing the studs 7 on the lower part of the flange plate of the H-shaped steel, and bonding a rubber plate 3 on the lower part of the flange plate of the H-shaped steel.

And step three, splicing the steel arch frames 1 into a ring in the tunnel, wherein the ring-shaped steel arch frames 1 are supported in the tunnel.

Fourthly, a thin steel plate 2 is installed between two steel arches 1, the thin steel plate 2 is attached to a rubber plate 3 of a flange plate of the steel arch 1 and is fixed by a pressing strip 4, the pressing strip 4 is positioned at the joint of the two thin steel plates 2, a stud 7 penetrates through a connecting hole of the pressing strip 4, the lower end of the stud is fixed by a nut, and the stud is fixed for a circle in a reciprocating mode; when the thin steel plate 2 is installed behind the shield body, as shown in fig. 5, the middle part of the steel arch 1 is a TBM horizontal supporting area 12, and the thin steel plate 2 is not installed in the TBM horizontal supporting area 12, so that the thin steel plate 2 at the horizontal supporting position is prevented from being deformed by horizontal supporting pressure during TBM tunneling; if the surrounding rock 9 is very broken and gushes water, the horizontal support cannot support the rock surface, and concrete can be lined at the position; if the surrounding rock 9 is relatively complete, after the TBM is driven to move and horizontally support the area without the steel sheet 2, the steel sheet 2 is installed at the TBM horizontal support area 12, as shown in figure 3.

And fifthly, spraying concrete on the thin steel plates 2 among the steel arch frames 1, solidifying the sprayed concrete below the thin steel plates 2 after spraying is finished, forming a sprayed concrete layer 11 together with the grab bars 5, and reinforcing the supporting strength and the stability of the supporting structure by the solidified concrete structure layer.

Step six, pouring a chemical pouring material 10 into a chemical pouring space between the thin steel plate 2 and the surrounding rock 9 through a grouting pipe 6, wherein the chemical pouring material 10 enters the rear part of the thin steel plate 3 to react, so that the aim of blocking cracks and water gushes on the rock surface is fulfilled, the water gushes on the surrounding rock surface are blocked, and a good water blocking effect is achieved; if the inside of the surrounding rock 9 needs to be further subjected to consolidation grouting, a consolidation grouting hole can be punched through the grouting pipe 6, and then the surrounding rock 9 is subjected to consolidation grouting.

And seventhly, repeating the steps, and constructing in the tunnel by adopting the water plugging support device according to the steps to achieve the purposes of plugging and reinforcing the broken water burst points of the surrounding rock 9.

The water plugging support device can play a good support role in a tunnel through an annular support structure formed by matching the arch centering 1, the thin steel plate 2 and the pressing strip 4, after the installation is finished, concrete is sprayed on the thin steel plate 2 among the steel arch centering 1, after the spraying is finished, the sprayed concrete is solidified below the thin steel plate 2 and forms a sprayed concrete layer 11 together with the grabbing bar 5, and the support strength and the stability of the support structure can be enhanced by a solidified concrete structure layer; then, pouring a chemical filling material 10 into the chemical filling space between the thin steel plate 2 and the surrounding rock 9 through a grouting pipe 6, so as to plug water gushing on the surrounding rock surface and achieve a good water plugging effect; the water plugging support device is adopted during the construction of the open type TBM tunnel, the operation is simple, the construction is convenient, the support stability is good, the structural strength is high, the collapse of the tunnel roof and surrounding rocks on two sides can be prevented, the good water plugging effect is achieved, the construction efficiency can be improved, the construction cost is reduced, and the safety protection performance of the support structure is improved.

Although the preferred embodiments of the present patent have been described in detail, the present patent is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present patent within the knowledge of those skilled in the art.