1. The construction method of the cement-soil mixing pile type crown beam is characterized by comprising the following steps of:

a1, leveling a construction site, measuring paying-off, axis fixing, pile position of a row pile and grooving;

b1, moving the mixing pile machine in place and leveling;

c1, constructing single-width and row stirring piles by the stirring pile machine;

d1, hoisting the assembled crown beam in place, and positioning and leveling;

c1, inserting the section steel cement soil mixing pile/sheet pile into the blank space inside the assembled crown beam;

d1, after the assembly type crown beam in the range is installed, moving the mixing pile machine to position the assembly type crown beam in the next range;

e1, connecting the assembled crown beams of each section into a whole;

f1, after the foundation pit or the underground structure is constructed, dismantling and recycling the assembled crown beam.

2. The cement-soil mixing pile type crown beam construction method according to claim 1, characterized in that: the fabricated crown beam is of a prefabricated fabricated steel structure/reinforced concrete structure/steel-reinforced concrete structure.

3. The cement-soil mixing pile type crown beam construction method according to claim 1, characterized in that: the step E1 or the step F1 or the step G1 is followed by: and filling the gap between the pile body of the profile steel cement soil mixing pile/plate pile and the assembled crown beam with cement slurry stirred by the mixing pile machine.

4. The cement-soil mixing pile type crown beam construction method according to claim 1, characterized in that: the step E1 includes: and connecting the adjacent assembled crown beams into a whole through anchor bolts, screws, buckles and welding.

5. A cast-in-place pile type crown beam construction method is characterized by comprising the following steps:

a2, leveling a construction site, measuring paying-off, axis fixing, pile position of a row pile and grooving;

b2, placing the assembled crown beam into the groove, hoisting to the position, positioning and leveling, and reserving a pile hole;

c2, moving the mixing pile machine in place and leveling;

d2, filling piles and pipe piles in the pile holes reserved in the assembled crown beam;

e2, after the reinforcement cage is placed on the cast-in-situ bored pile, pouring concrete in the cast-in-situ bored pile to fill the gap between the reserved pile holes of the assembled crown beam;

f2, after the precast tubular pile/sheet pile is constructed to the elevation, filling a gap between the assembled crown beam and the precast tubular pile/sheet pile with concrete/cement soil;

g2, after the assembly type crown beam in the range is installed, moving the machine to position and construct the assembly type crown beam of the next range;

h2, connecting the assembled crown beams of each section into a whole;

i2, after the construction of the foundation pit or the underground structure is finished, dismantling and recovering the assembled crown beam.

6. The cast-in-place pile type crown beam construction method according to claim 5, characterized in that: the fabricated crown beam is of a prefabricated fabricated steel structure/reinforced concrete structure/steel-reinforced concrete structure.

7. The cast-in-place pile type crown beam construction method according to claim 5, characterized in that: the step H2 includes: and connecting the adjacent assembled crown beams into a whole through anchor bolts, screws, buckles and welding.

8. A crown beam system characterized by: the prefabricated top beam is arranged on the top of the pile body, the section steel/cast-in-place pile is arranged in the prefabricated top beam, and concrete/cement soil is arranged between the prefabricated top beam and the section steel/cast-in-place pile.

9. The crown beam system of claim 8, wherein: the assembled crown beam comprises two flange plates which are symmetrically arranged and a plurality of webs which are connected between the two flange plates.

Background

At present, geotechnical engineering is vigorously developed in China, foundation pit engineering is more and more, and various foundation pit supporting technologies are widely applied. Along with deeper excavation and more complex surrounding environment of foundation pit engineering, the vertical foundation pit supporting structure is particularly widely applied.

In the vertical foundation pit supporting technology, the most commonly used are steel sheet piles, section steel cement soil mixing piles, sheet piles, tubular piles, cast-in-place piles, underground continuous walls and the like. The above enclosing structures are in single-piece and single-width structural forms, and the integrity, the continuity, the safety and the effectiveness of the enclosing structures can be ensured only by adopting the crown beams, the connecting beams and the like for connection at the tops of the enclosing structures. The former crown beam is basically of reinforced concrete structure (a small amount of steel structure). This presents the problem of: the construction of the reinforced concrete crown beam is adopted, the traditional procedures of chiseling, binding reinforcing steel bars, supporting a template, pouring concrete and the like on the original pile head are required, a large amount of manpower and material resources are consumed, the construction period is prolonged, the environment is polluted, and meanwhile, the huge waste of resources is caused; as for the crown beam or the purlin adopting the prior profile steel structure, the application range is greatly reduced because the crown beam or the purlin cannot be integrated with structural bodies such as reinforced concrete, cement soil and the like and is stressed only by the strength and the rigidity of the profile steel structure. Therefore, it is very important to adopt a simple and feasible crown beam system which saves resources, manpower, construction period and cost to solve the above problems.

Disclosure of Invention

The invention aims to provide a cement-soil mixing pile type crown beam construction method, a cast-in-place pile type crown beam construction method and an assembly type crown beam system.

In order to solve the technical problem, the invention provides a cement-soil mixing pile type crown beam construction method, which comprises the following steps:

a1, leveling a construction site, measuring paying-off, axis fixing, pile position of a row pile and grooving;

b1, moving the mixing pile machine in place and leveling;

c1, constructing single-width and row stirring piles by the stirring pile machine;

d1, hoisting the assembled crown beam in place, and positioning and leveling;

c1, inserting the section steel cement soil mixing pile/sheet pile into the blank space inside the assembled crown beam;

d1, after the assembly type crown beam in the range is installed, moving the mixing pile machine to position the assembly type crown beam in the next range;

e1, connecting the assembled crown beams of each section into a whole;

f1, after the foundation pit or the underground structure is constructed, dismantling and recycling the assembled crown beam.

Further, the fabricated crown beam is of a prefabricated steel structure/reinforced concrete structure/steel-reinforced concrete structure.

Further, the following step E1, step F1, or step G1 further includes: and filling the gap between the pile body of the profile steel cement soil mixing pile/plate pile and the assembled crown beam with cement slurry stirred by the mixing pile machine.

Further, the step E1 includes: and connecting the adjacent assembled crown beams into a whole through anchor bolts, screws, buckles and welding.

The invention also provides a cast-in-place pile type crown beam construction method, which comprises the following steps:

a2, leveling a construction site, measuring paying-off, axis fixing, pile position of a row pile and grooving;

b2, placing the assembled crown beam into the groove, hoisting to the position, positioning and leveling, and reserving a pile hole;

c2, moving the mixing pile machine in place and leveling;

d2, filling piles and pipe piles in the pile holes reserved in the assembled crown beam;

e2, after the reinforcement cage is placed on the cast-in-situ bored pile, pouring concrete in the cast-in-situ bored pile to fill the gap between the reserved pile holes of the assembled crown beam;

f2, after the precast tubular pile/sheet pile is constructed to the elevation, filling a gap between the assembled crown beam and the precast tubular pile/sheet pile with concrete/cement soil;

g2, after the assembly type crown beam in the range is installed, moving the machine to position and construct the assembly type crown beam of the next range;

h2, connecting the assembled crown beams of each section into a whole;

i2, after the construction of the foundation pit or the underground structure is finished, dismantling and recycling the assembled crown beam.

Further, the fabricated crown beam is of a prefabricated steel structure/reinforced concrete structure/steel-reinforced concrete structure.

Further, the step H2 includes: and connecting the adjacent assembled crown beams into a whole through anchor bolts, screws, buckles and welding.

The invention also provides a crown beam system which comprises a pile body, an assembled crown beam arranged at the top of the pile body, the section steel/cast-in-place pile arranged in the assembled crown beam and concrete/cement arranged between the assembled crown and the section steel/cast-in-place pile.

Further, the assembled crown beam comprises two flange plates which are symmetrically arranged and a plurality of webs which are connected between the two flange plates.

According to the cement-soil mixed pile type crown beam construction method and the cast-in-place pile type crown beam construction method, for pile arrangement structures such as steel sheet piles, section steel cement mixed piles, sheet piles, tubular piles, cast-in-place piles, underground continuous walls and the like, the assembled crown beam is preset at the top of the pile arrangement structure and comprises a steel structure, a reinforced concrete structure or a steel-reinforced concrete combined structure form, so that the traditional procedures of secondary excavation, pile head chiseling, cement soil chiseling, reinforcing steel bar binding, formwork erecting, concrete pouring and the like can be avoided, and the pile arrangement structure is formed at one time. The construction method is simple and feasible, so that the crown beam system and the building envelope are well combined together, the crown beam system and the building envelope can be formed at one time, resources, manpower, construction period and construction cost are saved, meanwhile, environmental pollution is avoided, the assembled crown beam can be recycled, and the purpose of further saving resources and construction cost can be achieved.

Drawings

Fig. 1 to 4 are plan sectional views of a structural steel cemented soil mixing pile/sheet pile and the like which are mixed and then inserted into a building envelope according to the method for constructing a soil cement mixing pile type crown beam of the present invention, in which:

FIG. 1 is a plan view of an assembled crown beam with a rib plate provided every other section steel;

FIG. 2 is a plan view of an assembled crown beam with a rib plate provided at the interval of two structural steels;

FIG. 3 is a cross-sectional view of an assembled crown beam with a rib plate provided every other section steel;

FIG. 4 is a cross-sectional view of an assembled crown beam with a rib plate separating two structural steels;

labeled as: the prefabricated top beam 1, the section steel cement soil mixing pile/sheet pile 2, and the gap 3 between the prefabricated top beam and the pile body;

fig. 5 to 8 are plane sectional views of the cast-in-place pile type crown beam construction method of the present invention in cast-in-place piles, underground continuous walls, pipe piles, sheet piles, etc. which require to form holes and cast reinforced concrete structures or in pile pressing formation, wherein:

FIG. 5 is a plan view of an assembled crown beam having a rib plate spaced from one pile or wall segment;

FIG. 6 is a plan view of an assembled crown beam with a rib plate provided between two spaced piles or wall segments;

FIG. 7 is a cross-sectional view of an assembled crown beam having a rib panel spaced apart from a pile or wall segment;

FIG. 8 is a cross-sectional view of an assembled crown beam with a rib plate separating two piles or wall sections;

labeled as: the method comprises the following steps of (1) assembling type crown beams 4, cast-in-place piles/pipe pile sheet piles 5 and gaps 6 between the assembling type crown beams and pile bodies;

fig. 9 to 12 are examples of four plan views of the fabricated crown beam of the present invention:

FIG. 9 is a plan view of a crown beam of an assembled single-plate steel structure;

FIG. 10 is a plan view of an assembled composite steel structural crown beam;

FIG. 11 is a plan view of an assembled combined reinforced concrete crown beam;

FIG. 12 is a plan view of a matched reinforced concrete crown beam;

labeled as: a web 7 and a flange plate 8.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like 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 illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

As shown in fig. 1 to 4, a construction method of a cement-soil mixed pile type crown beam is suitable for a pile-arranging structure, such as a steel sheet pile, a section steel-soil mixed pile, a sheet pile, a pipe pile, a cast-in-place pile, an underground diaphragm wall and the like, the assembly type crown beam 1 adopts a prefabricated assembly type structure and a steel structure, and can be formed in one step along with the insertion process of a section steel-soil mixed pile/sheet pile 2, the assembly type crown beam 1 of the steel structure adopts a rib plate arranged at intervals of one section steel, and the method specifically comprises the following steps:

a1, leveling a construction site, measuring paying-off, axis fixing, pile position of a row pile and grooving;

b1, moving the mixing pile machine in place and leveling;

c1, constructing single and row stirring piles according to the design requirement by the stirring pile machine;

d1, hoisting the assembled crown beam 1 to a design position, and positioning and leveling;

c1, inserting the section steel cement soil mixing pile/sheet pile 2 into a blank in the assembled crown beam 1;

d1, after the assembly type crown beam 1 in the range is installed, moving the mixing pile machine to position the assembly type crown beam 1 of the next section;

e1, connecting the assembled crown beams 1 into a whole, specifically, connecting the adjacent assembled crown beams 1 into a whole through anchor bolts/screws/buckles/welding;

f1, after the foundation pit or the underground structure is constructed, dismantling and recovering the assembled crown beam 1.

The fabricated crown beam 1 is of a prefabricated fabricated steel structure/reinforced concrete structure/steel-reinforced concrete structure.

The step E1 or the step F1 or the step G1 is followed by: and filling the gap between the pile body of the profile steel cement soil mixing pile/sheet pile 2 and the assembled crown beam 1 with cement slurry stirred by the mixing pile machine.

As shown in fig. 5 to 8. The invention also provides a cast-in-place pile type crown beam construction method, which is used for casting reinforced concrete structures or pressing piles to be formed by forming holes in cast-in-place piles, underground continuous walls, tubular piles, sheet piles and the like, and comprises the following steps:

assembled crown beam 4, cast-in-place pile/pipe pile sheet pile 5, and gap 6 between assembled crown beam and pile body

A2, leveling a construction site, measuring paying-off, axis fixing, pile position of a row pile and grooving;

b2, placing the assembled crown beam 4 into the groove, hoisting to a designed position, positioning and leveling, and reserving a pile hole;

c2, moving the mixing pile machine in place and leveling;

d2, reserving a pile hole of a cast-in-place pile/pipe pile sheet pile 5 in the fabricated crown beam 4 according to design requirements to carry out cast-in-place pile and pipe pile construction;

e2, pouring concrete into the cast-in-place pile to fill the gap between the reserved pile holes of the assembled crown beam 4 after the cast-in-place pile is drilled and the steel reinforcement cage is laid down;

f2, after the precast tubular pile/sheet pile is constructed to the elevation, filling the gap between the fabricated crown beam 4 and the precast tubular pile/sheet pile with concrete/cement soil;

g2, after the assembly type crown beam 4 in the range is installed, moving the machine to position and construct the assembly type crown beam 4 of the next section;

h2, connecting the assembled crown beams 4 of each section into a whole; specifically, the adjacent assembled crown beams 4 are connected through anchor bolts/screws/buckles/welding, and the assembled crown beams of each section are connected into a whole;

i2, after the construction of the foundation pit or the underground structure is finished, dismantling and recycling the assembled crown beam 4.

Further, the fabricated crown beam 4 is a prefabricated fabricated steel structure/reinforced concrete structure/steel-reinforced concrete structure.

To the campshed structure, predetermine at its top assembled hat roof beam, including steel construction, reinforced concrete structure or steel-reinforced concrete integrated configuration form, can avoid traditional processes such as secondary excavation, chisel pile head, chisel soil cement, ligature reinforcing bar, formwork, concreting, along with campshed structure one shot forming like steel sheet pile, shaped steel soil cement mixing pile, sheet pile, tubular pile, bored concrete pile, underground continuous wall etc.. The construction method is simple and feasible, so that the crown beam system and the building envelope are well combined together, the crown beam system and the building envelope can be formed at one time, resources, manpower, construction period and construction cost are saved, meanwhile, environmental pollution is avoided, the assembled crown beam can be recycled, and the purpose of further saving resources and construction cost can be achieved.

As shown in fig. 9 to 12, the present invention also provides a crown beam system including a pile body, a fabricated crown beam disposed on top of the pile body, a section steel/cast-in-place pile disposed in the fabricated crown beam, and concrete/cement disposed between the fabricated crown and the section steel/cast-in-place pile.

The prefabricated assembly type crown beam system in the form of a steel structure, a reinforced concrete structure or a steel-reinforced concrete combined structure is hoisted in place during the construction of the enclosure structure, and cement soil or concrete and the like on the upper part of the enclosure structure are used for filling gaps of the assembly type crown beam system.

The assembled crown beam comprises two flange plates 8 which are symmetrically arranged and a plurality of webs 7 which are connected between the two flange plates 8. Specifically, in fig. 9, the web 7 is a single-plate steel web, and the flange plate 8 is a single-plate steel flange plate, which are connected by welding; in fig. 10, the web 7 is a single-plate steel web, and the flange plate 8 is a double-layer steel flange plate, which are connected by welding; in fig. 11, the web 7 is a single-plate steel web, and the flange plate 8 is a reinforced concrete flange plate, which are connected by welding or embedded connection; in fig. 12, the web 7 is a reinforced concrete web, the flange plate 8 is a reinforced concrete flange plate, and the two are integrally prefabricated. The fabricated crown beam system is used for manufacturing the crown beam system, so that the crown beam system and the enclosure structure can be formed at one time, the traditional processes of secondary pile head chiseling, cement soil chiseling, reinforcing steel bar binding, template supporting, concrete pouring and the like are avoided, the environment pollution is avoided while the resources, the manpower, the construction period and the construction cost are saved, and the crown beam system can be repeatedly utilized, so that the resources and the construction cost are further saved.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and those skilled in the art can make many variations and modifications of the technical solution of the present invention without departing from the scope of the technical solution of the present invention by using the above disclosure, and the technical solution of the present invention is covered by the claims.