A recyclable assembled composite ground-connected wall and assembly and dismantling method thereof

Abstract

The present invention is a recyclable assembled composite ground-connected wall and an assembly and dismantling method. The recyclable assembled composite ground-connected wall includes steel sheet piles, prefabricated wall sections, and fluidized solidified soil. During the assembly construction of the ground-connected wall, at the position of the ground-connected wall groove section, a lifting machine is used to put the steel sheet piles into the groove, and inserted into the locking structure of the adjacent steel sheet piles to form a closed steel plate grid; the prefabricated wall section is put into the steel plate grid by a lifting machine, and the fluidized solidified soil is filled between the steel sheet piles and the prefabricated wall section. During the dismantling construction of the ground-connected wall, a vibrating hammer device is used to loosen the steel sheet piles, and a lifting machine is used to pull out the prefabricated wall section. At the same time, fluidized solidified soil is injected during the pulling process. After the fluidized solidified soil hardens, the prefabricated wall sections are pulled out one by one, and then the steel sheet piles are pulled out. The present invention is an assembled composite ground-connected wall structure system that can be recycled and can be recycled, and is easy to implement and has good water-stopping performance and support stiffness.

Description

Technical Field

[0001] The invention relates to the technical field of underground continuous walls of foundation pits, and in particular to a recyclable assembled composite underground continuous wall and an assembly and dismantling method thereof. Background Art

[0002] Underground continuous walls are widely used in deep foundation pit projects. They are a type of support structure with greater structural rigidity and good integrity. According to the construction process, underground continuous walls can be divided into two types: cast-in-place ground-connected walls and prefabricated ground-connected walls. Cast-in-place ground-connected walls have better water-stopping performance and greater lateral rigidity, but require the production of steel cages and concrete pouring, and the construction process is complex; prefabricated ground-connected walls have the characteristics of parametric design and industrialized production, but are prone to water seepage at joints and joints.

[0003] In addition, regardless of whether it is a cast-in-place ground-anchored wall or a prefabricated ground-anchored wall, after the foundation pit construction is completed, most of the ground-anchored walls will be abandoned in situ and cannot be recovered, making it difficult to achieve recycling. These abandoned ground-anchored walls pose potential risks to future urban construction and planning, with far-reaching impacts, and are contrary to the green and low-carbon construction concept. Summary of the invention

[0004] The present invention aims to solve the deficiencies of the prior art and provide a recyclable assembled composite ground-connected wall and an assembly and disassembly method.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A recyclable assembled composite ground-anchored wall comprises steel sheet piles and prefabricated wall sections for assembling underground continuous walls, and fluidized solidified soil for filling gaps between the steel sheet piles and the prefabricated wall sections. The steel sheet piles, prefabricated wall sections and fluidized solidified soil together form a lateral force resistance system of the ground-anchored wall.

[0007] The steel sheet pile includes a web plate, flange plates are provided at both ends of the web plate, the web plate and the flange plates are in an I-shaped structure, one end of the flange plate is provided with a forward locking mouth and the other end is provided with a reverse locking mouth, a grouting pipe is welded in the middle position of the outer side surface of the flange plate, grouting holes are evenly distributed on the grouting pipe, the flange plates corresponding to two adjacent steel sheet piles are connected by a forward locking mouth and a reverse locking mouth, and a closed steel plate grid is formed between the two adjacent steel sheet piles.

[0008] The precast wall section is a precast concrete structure inserted in a closed steel plate area formed between two adjacent steel sheet piles. The surface of the precast wall section is flat and smooth, and has been treated with a surface layer of fair-faced concrete protective agent. The precast wall section includes a wall section web, and wall section flange plates are provided at both ends of the wall section web. The wall section web and the wall section flange plates are in an I-shaped structure. A ground-connected wall inclinometer tube runs through the middle of the wall section web from top to bottom. Two lifting rings are symmetrically provided on the top of each wall section flange plate. An avoidance groove runs through the middle position of the outer side of each wall section flange plate from top to bottom. Through holes are opened on both sides of the two wall section flange plates from top to bottom, and the connection between the forward lock and the reverse lock is located in the avoidance groove.

[0009] Chamfer structures are provided at the contact angles between the wall section web plate and the wall section flange plate, at the four corners of the wall section flange plate, and at the contact angles between the wall section flange plate and the avoidance groove.

[0010] The fluidized solidified soil is composed of the waste soil produced by the trenching of the ground-anchored wall, a solidifying agent and an expanding agent. The solidifying agent is a cementitious material mixed with cement kiln dust and rice husk ash, and the expanding agent is bentonite.

[0011] The above-mentioned method for assembling a recyclable assembled composite ground-connected wall comprises the following specific steps:

[0012] S1. Use the milling equipment to make grooves at the designed position of the ground-connected wall of the foundation pit project;

[0013] S2. When hoisting the steel sheet piles, apply lubricant on the inside and outside of the steel sheet piles, and apply ointment on the positive locking and reverse locking of the steel sheet piles; align the positive locking of the flange plate end of the steel sheet pile with the reverse locking of the adjacent constructed steel sheet piles, and use the lifting machinery to slowly put the steel sheet piles into the ground-connected wall groove section. During the lowering process, ensure the verticality of the steel sheet piles, and form a closed steel plate grid between adjacent steel sheet piles;

[0014] S3. Apply lubricant on the surface of the precast wall segment, use a lifting machine to lift the precast wall segment at the four lifting rings, and slowly place the precast wall segment vertically into the closed steel plate grid formed between adjacent steel sheet piles. The avoidance groove at the flange plate of the wall segment is aligned with the connection between the forward locking and reverse locking of the steel sheet piles. Insert a mud pipe into the ground-connected wall inclinometer tube at the center of the wall segment web. During the sinking process of the precast wall segment, use an external suction pump to pump out the sediment at the bottom. After the sinking of the precast wall segment is completed, set an inclinometer device in the ground-connected wall inclinometer tube at the center of the wall segment web to monitor the verticality at any time.

[0015] S4, using a mud pump to pump the pre-prepared fluidized solidified soil into the gap between the steel sheet pile and the prefabricated wall section, and fill it to the top surface of the ground-connected wall groove section;

[0016] S5, continue to assemble the next ground-connected wall along the direction of the ground-connected wall according to steps S1, S2, S3, and S4, inject cement slurry through the grouting pipe to fill the gap between the ground-connected wall groove wall and the steel sheet piles, and after the grouting is completed, insert a PVC pipe with a wooden plug into the grouting pipe;

[0017] S6. Continuously assemble the composite ground-anchored wall until the entire ground-anchored wall structure is formed.

[0018] In step S3, vibration equipment is used to assist wall sinking during the lowering process of the prefabricated wall section; the height of the steel sheet pile is greater than the depth of the ground-connected wall trench section. After the prefabricated wall section is hoisted, a vibration hammering machine is used to hammer the steel sheet pile to below the top surface of the impermeable layer.

[0019] In step S6, after the assembly is completed, welding is performed on the surface of the steel sheet piles and the support system in the foundation pit is installed.

[0020] The above-mentioned method for dismantling a recyclable assembled composite ground-connected wall comprises the following specific steps:

[0021] P1. Use vibrating lifting equipment to pre-lift the top of the prefabricated wall segment to loosen the prefabricated wall segment and reduce the bonding force between the surface of the prefabricated wall segment and the surrounding materials;

[0022] P2. Remove the inclinometer device in the inclinometer tube of the ground-connected wall of the prefabricated wall segment, use a lifting machine to lift the prefabricated wall segment at the four lifting rings, and slowly pull up the prefabricated wall segment; after pulling up a certain distance, use a pneumatic pick to break and remove the fluidized solidified soil remaining in the through-holes of the flange, and then insert the shoulder pole beam into the through-holes corresponding to the flange plate of the wall segment to maintain the height of the prefabricated wall segment; use a mud pump to pump the pre-prepared fluidized solidified soil through the ground-connected wall inclinometer tube into the vacancy at the bottom after the prefabricated wall segment is pulled out; after the fluidized solidified soil hardens, pull out the shoulder pole beam, and use the lifting machine to continue to pull up to the next height; repeat until the prefabricated wall segment is completely pulled out;

[0023] P3. Insert a PVC pipe with a wooden plug into the grouting pipe. When the prefabricated wall section is removed, use the lifting equipment to remove the steel sheet piles between the prefabricated wall sections, poke open the wooden plug at the PVC pipe in the grouting pipe, and simultaneously inject cement slurry through the PVC pipe in the grouting pipe to reduce the impact of the removal of the steel sheet piles on the surrounding environment;

[0024] P4. Remove the prefabricated wall sections and steel sheet piles in sequence according to step P1, step P2, and step P3 until all the composite ground-connected walls are removed.

[0025] In order to speed up the demolition of the ground-anchored wall, multiple construction work surfaces are carried out along the length of the ground-anchored wall.

[0026] The beneficial effects of the present invention are as follows: the present invention is an assembled composite ground-connected wall structure system that can be recovered and recycled, is easy to implement, and has good water-stopping performance and supporting stiffness. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A three-dimensional diagram of the recyclable assembled composite ground-connected wall of the present invention;

[0028] Figure 2 A plan view of the recyclable assembled composite ground-connected wall in the present invention;

[0029] Figure 3 A three-dimensional diagram of the recyclable steel sheet piles of the assembled composite ground-connected wall of the present invention;

[0030] Figure 4 A plan view of the steel sheet piles of the recyclable assembled composite ground-connected wall of the present invention;

[0031] Figure 5 This is a locking connection diagram of the steel sheet piles of the recyclable assembled composite ground-connected wall in the present invention;

[0032] Figure 6 A three-dimensional diagram of a prefabricated wall segment of a recyclable assembled composite ground-connected wall in the present invention;

[0033] Figure 7 It is a schematic diagram of assembling the recyclable assembled composite ground-connected wall in the present invention;

[0034] Figure 8 A schematic diagram of dismantling the recyclable assembled composite ground-connected wall of the present invention;

[0035] In the figure: 1- steel sheet pile; 2- prefabricated wall section; 3- fluidized solidified soil;

[0036] 11-web plate; 12-flange plate; 13-positive locking port; 14-reverse locking port; 15-grouting pipe;

[0037] 21-wall section web plate; 22-wall section flange plate; 23-ground-connected wall inclinometer tube; 24-lifting ring; 25-through hole; 26-avoidance groove;

[0038] The following is a detailed description of the embodiments of the present invention with reference to the accompanying drawings. DETAILED DESCRIPTION

[0039] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The embodiments are only used to explain the present invention and are not used to limit the scope of the present invention. The present invention is described in more detail by way of example with reference to the accompanying drawings in the following paragraphs. The advantages and features of the present invention will become clearer according to the following description. It should be noted that the accompanying drawings are all in a very simplified form and are not in precise proportions, and are only used to facilitate and clearly assist in explaining the purpose of the embodiments of the present invention.

[0040] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a component centered. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a component centered. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a component centered. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0042] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0043] A recyclable assembled composite ground-anchored wall comprises steel sheet piles 1 and prefabricated wall sections 2 for assembling an underground continuous wall, and fluidized solidified soil 3 for filling the gaps between the steel sheet piles 1 and the prefabricated wall sections 2. The steel sheet piles 1, the prefabricated wall sections 2 and the fluidized solidified soil 3 together form a lateral force resistance system of the ground-anchored wall.

[0044] Both the steel sheet piles 1 and the prefabricated wall sections 2 can be prefabricated in a factory and then transported to the site for assembly; after the prefabricated composite continuous wall is dismantled, the steel sheet piles 1 and the prefabricated wall sections 2 can be transported to other foundation pit projects for assembly.

[0045] The steel sheet pile 1 includes a web 11, and flange plates 12 are provided at both ends of the web 11. The web 11 and the flange plates 12 are in an I-shaped structure. A forward locking port 13 is provided at one end of the flange plate 12 and a reverse locking port 14 is provided at the other end. A grouting pipe 15 is welded at the middle position of the outer side surface of the flange plate 12, and grouting holes are evenly distributed on the grouting pipe 15. The flange plates 12 corresponding to two adjacent steel sheet piles 1 are connected by the forward locking port 13 and the reverse locking port 14, and a closed steel plate grid is formed between the two adjacent steel sheet piles 1.

[0046] The cross-section of the steel sheet pile 1 is an I-shaped steel sheet pile, and the width of the steel sheet pile 1 is the same as the width of the ground-connected wall groove section.

[0047] The grouting pipe 15 is a steel sleeve valve pipe with grouting holes evenly arranged, and the height of the sleeve valve pipe is the same as the depth of the ground-connected wall groove section.

[0048] The grouting pipe 15 is used in conjunction with a PVC pipe with a wooden plug.

[0049] The precast wall section 2 is a precast concrete columnar structure arranged in a closed steel plate grid formed between two adjacent steel sheet piles 1, with a cross-sectional dimension slightly smaller than the net dimension of the steel plate grid and a height the same as the depth of the ground-connected wall groove section.

[0050] The surface of the prefabricated wall section 2 is flat and smooth, and is treated with a surface layer of a clear water concrete protective agent to increase the waterproof and anti-fouling properties of the concrete surface and reduce the bonding effect with the fluidized solidified soil 3.

[0051] The prefabricated wall segment 2 may be a rectangular section, a box section or an I-section. Preferably, the section of the prefabricated wall segment 2 is an I-section to reduce the lifting weight of the prefabricated wall segment 2 and ensure the section bending rigidity of the prefabricated wall segment 2.

[0052] The prefabricated wall section 2 includes a wall section web 21, and wall section flange plates 22 are provided at both ends of the wall section web 21. The wall section web 21 and the wall section flange plates 22 are in an I-shaped structure. A ground-connected wall inclinometer tube 23 penetrates the middle of the wall section web 21 from top to bottom. Two hanging rings 24 are symmetrically provided on the top of each wall section flange plate 22. An avoidance groove 26 penetrates the middle position of the outer side surface of each wall section flange plate 22 from top to bottom. Through holes 25 are correspondingly opened on both sides of the two wall section flange plates 22 from top to bottom, and the connection between the forward locking mouth 13 and the reverse locking mouth 14 is located in the avoidance groove 26.

[0053] When assembling the ground-connected wall, an inclinometer, for example, can be placed in the ground-connected wall inclinometer tube 23 to monitor verticality. When dismantling the ground-connected wall, it can be used as an injection channel for the fluidized solidified soil 3.

[0054] The avoidance groove 26 is used to eliminate the squeezing of the prefabricated wall section on the locking mouth of the steel sheet pile.

[0055] Chamfer structures are provided at the contact angles between the wall segment web 21 and the wall segment flange plate 22 , the four corners of the wall segment flange plate 22 , and the contact angles between the wall segment flange plate 22 and the avoidance groove 26 to reduce the degree of damage to the corners of the prefabricated wall segment 2 .

[0056] The lifting ring 24 penetrates deep into the prefabricated wall section 2 and is reliably welded to the steel frame, and meets the requirements for removing the prefabricated wall section 2.

[0057] The through holes 25 are used to assist in the removal of the prefabricated wall segments.

[0058] When the prefabricated wall segment 2 is produced, a certain number of prestressed tendons are arranged along the height direction, and prestress is applied to improve the crack resistance of the prefabricated wall segment 2 during hoisting and removal.

[0059] The fluidized solidified soil 3 is a low-strength fluidized solidified soil, which is composed of waste soil generated by the trenching of the ground-connected wall, a curing agent and an expansion agent. The curing agent can be a cementitious material mixed with cement kiln dust, rice husk ash, etc., and the low-strength fluidized solidified soil is achieved by increasing the water-solid ratio. The expansion agent can be but is not limited to bentonite.

[0060] The fluidized solidified soil 3 is of low strength and mainly serves as a filling material.

[0061] At present, the research and development and application of low-strength fluidized solidified soil in China have achieved certain results. For example, various low-strength cementitious materials are used, such as metallurgical slag, coal combustion by-products, cement kiln dust, chemical by-products (such as calcium carbide slag, alkali slag, waste gypsum, etc.), agricultural by-products (such as rice husk ash) and other low-quality solid wastes. If they meet environmental protection requirements, they can all be used as curing agents for fluidized solidified soil 3. On the one hand, it reduces the amount of cement used, and at the same time, it also makes full use of solid waste, which can comprehensively reduce construction costs.

[0062] The fluidized solidified soil 3 can be configured as a self-compacting fluidized solidified soil. During the construction of the ground-connected wall, it is used to fill the gap between the steel sheet pile 1 and the prefabricated wall section 2 to ensure reliable force transmission between the steel sheet pile 1 and the prefabricated wall section 2; by increasing the water-solid ratio to reduce the strength of the fluidized solidified soil 3, it is prevented that the fluidized solidified soil 3 has a large bonding effect with the steel sheet pile 1 and the prefabricated wall section 2; during the demolition of the ground-connected wall, it is used to fill the gap generated when the prefabricated wall section 2 is pulled out, and by adjusting the amount of bentonite mixed, the fluidized solidified soil 3 will produce a certain volume expansion when hardening, eliminating the stress loss caused by the removal of the prefabricated wall section 2, and preventing the surrounding environment from being greatly deformed.

[0063] The fluidized solidified soil 3 makes full use of the waste soil generated by the trenching of the ground-connected wall, thus avoiding the transportation of the waste soil.

[0064] The cross-sectional dimensions of the prefabricated wall segments 2 and the steel sheet piles 1 along the ground-connected wall direction can be adjusted according to the configuration of the lifting and removal machinery to meet the feasibility of the ground-connected wall during removal.

[0065] During the assembly construction of the ground-connected wall, at the location of the ground-connected wall groove section, a lifting machine is used to put the steel sheet pile 1 into the groove and insert it into the locking structure of the adjacent steel sheet pile 1 to form a closed steel plate grid; a lifting machine is used to put the prefabricated wall section 2 into the steel plate grid, and fluidized solidified soil 3 is filled between the steel sheet pile 1 and the prefabricated wall section 2, so that the steel sheet pile 1, the prefabricated wall section 2 and the hardened fluidized solidified soil 3 form a composite ground-connected wall, which is continuously assembled to form the overall structure of the ground-connected wall. The specific steps are as follows:

[0066] S1. Use the milling equipment to make grooves at the designed position of the ground-connected wall of the foundation pit project;

[0067] S2. When hoisting the steel sheet pile 1, apply lubricant, such as polytetrafluoroethylene, on the inside and outside of the steel sheet pile 1, and apply ointment, such as a butter-asphalt mixture, on the forward locking opening 13 and the reverse locking opening 14 of the steel sheet pile 1; align the forward locking opening 13 at the end of the flange plate 12 of the steel sheet pile 1 with the reverse locking opening 14 of the adjacent constructed steel sheet pile 1, and use a lifting machine to slowly place the steel sheet pile 1 into the ground-connected wall groove section. During the lowering process, ensure the verticality of the steel sheet pile 1, and form a closed steel plate grid between adjacent steel sheet piles 1;

[0068] S3. Apply lubricant, such as polytetrafluoroethylene, on the surface of the prefabricated wall segment 2 several times, and use a lifting machine to lift the prefabricated wall segment 2 at the four lifting rings 24, and slowly put the prefabricated wall segment 2 vertically into the closed steel plate grid formed between adjacent steel sheet piles 1, with the avoidance groove 26 at the flange plate 22 of the wall segment aligned with the connection between the forward locking opening 13 and the reverse locking opening 14 of the steel sheet pile 1. If necessary, use a vibration device to assist in sinking the wall during the lowering process of the prefabricated wall segment;

[0069] A mud pipe is inserted into the ground-connected wall inclinometer tube 23 at the center of the wall segment web 21. During the sinking process of the prefabricated wall segment 2, an external suction pump is used to extract the sediment at the bottom. After the sinking of the prefabricated wall segment 2 is completed, an inclinometer device is installed in the ground-connected wall inclinometer tube 23 at the center of the wall segment web 21 to monitor the verticality at any time.

[0070] The height of the steel sheet pile 1 is greater than the depth of the ground-connected wall trench section. After the prefabricated wall section 2 is hoisted, the steel sheet pile 1 is hammered below the top surface of the impermeable layer using a vibrating hammering machine. The purpose of cutting off the permeable layer is achieved by hammering down the steel sheet pile 1, which can avoid increasing the depth of the ground-connected wall trench and the length of the prefabricated wall section 2, thereby saving engineering cost investment.

[0071] S4, using a mud pump to pump the pre-prepared fluidized solidified soil 3 into the gap between the steel sheet pile 1 and the prefabricated wall section 2, and fill it to the top surface of the ground-connected wall groove section;

[0072] The fluidized solidified soil 3 is mixed with a small amount of swelling agent. After the fluidized solidified soil 3 expands and hardens, it can fully fill the gaps. On the one hand, it ensures the reliable force transmission between the steel sheet pile 1 and the prefabricated wall section 2, and on the other hand, it improves the water-stopping performance of the composite ground-connected wall.

[0073] S5, continue to assemble the next ground-connected wall along the direction of the ground-connected wall according to steps S1, S2, S3, and S4, inject cement slurry through the grouting pipe 15 to fill the gap between the ground-connected wall groove wall and the steel sheet pile 1, and after the grouting is completed, insert a PVC pipe with a wooden plug into the grouting pipe 15;

[0074] The cement slurry ensures that the surrounding environment of the ground-connected wall does not produce significant deformation;

[0075] The PVC pipe is a reserved grouting path when the steel sheet pile 1 is removed, and the wooden plug prevents the cement slurry from flowing into the PVC pipe and solidifying.

[0076] S6. Continuously assemble the composite ground-anchored wall until the whole ground-anchored wall structure is formed. Subsequently, welding can be performed on the surface of the steel sheet pile 1 to provide construction conditions for the installation of the support system in the foundation pit, and the support system in the foundation pit is installed.

[0077] When dismantling the ground-connected wall, the steel sheet piles 1 are loosened by vibrating hammer equipment, and the prefabricated wall sections 2 are removed by lifting machinery. At the same time, fluidized solidified soil 3 is injected during the removal process. After the fluidized solidified soil 3 hardens, the prefabricated wall sections 2 are removed one by one, and then the steel sheet piles 1 are removed. The specific steps are as follows:

[0078] P1. Use a vibrating lifting device to pre-lift the top of the prefabricated wall segment 2 to loosen the prefabricated wall segment 2 and reduce the bonding force between the surface of the prefabricated wall segment 2 and the surrounding materials;

[0079] P2. Remove the inclinometer device in the inclinometer tube 23 of the ground-connected wall of the prefabricated wall section 2, and use a lifting machine to lift the four lifting rings 24 of the prefabricated wall section 2 to slowly pull up the prefabricated wall section 2; after pulling up a certain distance, use a pneumatic pick to break and remove the fluidized solidified soil 3 remaining in the through holes 25 corresponding to the flange plate 22, and then insert a shoulder pole beam into the through holes 25 corresponding to the flange plate 22 of the wall section to maintain the height of the prefabricated wall section 2; use a mud pump to pump the pre-prepared fluidized solidified soil 3 through the ground-connected wall inclinometer tube 23 into the vacancy generated at the bottom of the prefabricated wall section 2 after it is pulled out; after the fluidized solidified soil 3 hardens, pull out the shoulder pole beam, and continue to pull up to the next height using a lifting machine; repeat the above process until the prefabricated wall section 2 is completely pulled out;

[0080] The fluidized solidified soil 3 is mixed with an expansion agent. By adjusting the amount of bentonite mixed, the volume expansion of the fluidized solidified soil 3 after hardening can be controlled to eliminate the stress loss caused by the removal of the prefabricated wall section 2 and prevent the surrounding environment from being greatly deformed.

[0081] P3. Insert a PVC pipe with a wooden plug into the grouting pipe 15. When the prefabricated wall section 2 is removed, use the lifting equipment to remove the steel sheet piles 1 between the prefabricated wall sections 2, poke open the wooden plug at the PVC pipe in the grouting pipe 15, and simultaneously inject cement slurry through the PVC pipe in the grouting pipe 15 to reduce the impact of the removal of the steel sheet piles 1 on the surrounding environment;

[0082] P4. Remove the prefabricated wall segments 2 and the steel sheet piles 1 in sequence according to step P1, step P2, and step P3 until all the composite ground-connected walls are removed.

[0083] In order to speed up the demolition of the ground-anchored wall, multiple construction work surfaces are carried out along the length of the ground-anchored wall.

[0084] The assembled composite ground-connected wall of the present invention avoids the shortcomings of complex construction process and long construction period of cast-in-place underground continuous wall, and can be easily guaranteed in quality through parametric design and industrialized production; the steel sheet piles 1 and the prefabricated wall sections 2 can be divided according to the transportation and construction machinery of the project site, and have strong project applicability; the steel sheet piles 1 and the fluidized solidified soil 3 jointly ensure the water-stopping performance of the ground-connected wall, and the prefabricated wall sections 2 ensure the bending stiffness of the ground-connected wall; during the construction of the ground-connected wall, it can be quickly assembled and formed, with high construction efficiency, which can shorten the construction period; after the foundation pit construction is completed, the steel sheet piles 1 and the prefabricated wall sections 2 can be recycled to achieve the recycling of the steel sheet piles 1 and the prefabricated wall sections 2; the fluidized solidified soil 3 is taken from the abandoned soil in the trench of the ground-connected wall, and the abandoned soil is backfilled in situ in the form of the fluidized solidified soil 3, which reduces the amount of abandoned soil transported out, and by adjusting the amount of expansion agent mixed, the effect of controlling the deformation of the surrounding environment can be achieved, and it has good application prospects.

[0085] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the present invention, or are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A recyclable assembled composite ground-connected wall, characterized in that: It comprises steel sheet piles (1) and prefabricated wall sections (2) for assembling underground continuous walls, and fluidized solidified soil (3) for filling the gaps between the steel sheet piles (1) and the prefabricated wall sections (2), wherein the steel sheet piles (1), the prefabricated wall sections (2) and the fluidized solidified soil (3) together form a lateral force resistance system of the underground continuous wall; The steel sheet pile (1) comprises a web (11), flange plates (12) are provided at both ends of the web (11), the web (11) and the flange plates (12) are in an I-shaped structure, one end of the flange plate (12) is provided with a forward locking opening (13) and the other end is provided with a reverse locking opening (14), a grouting pipe (15) is welded at the middle position of the outer side surface of the flange plate (12), and grouting holes are evenly distributed on the grouting pipe (15), the flange plates (12) corresponding to two adjacent steel sheet piles (1) are connected via the forward locking opening (13) and the reverse locking opening (14), and a closed steel plate grid is formed between the two adjacent steel sheet piles (1); The precast wall section (2) is a precast concrete structure inserted in a closed steel plate grid formed between two adjacent steel sheet piles (1). The surface of the precast wall section (2) is flat and smooth and has been treated with a surface layer of a clear concrete protective agent. The precast wall section (2) comprises a wall section web (21). Wall section flange plates (22) are provided at both ends of the wall section web (21). The wall section web (21) and the wall section flange plates (22) are in an I-shaped structure. A ground-connected wall inclinometer tube (23) is passed through the middle of the wall section web (21) from top to bottom. Two lifting rings (24) are symmetrically provided at the top of each wall section flange plate (22). An avoidance groove (26) is passed through the middle of the outer side surface of each wall section flange plate (22) from top to bottom. Through holes (25) are correspondingly opened on both sides of the two wall section flange plates (22) from top to bottom. The connection between the forward locking opening (13) and the reverse locking opening (14) is located in the avoidance groove (26). The fluidized solidified soil (3) is composed of waste soil generated during the trenching of the ground-anchored wall, a solidifying agent and an expanding agent. The solidifying agent is a cementitious material mixed with cement kiln dust and rice husk ash, and the expanding agent is bentonite.

2. The recyclable assembled composite ground-connected wall according to claim 1, characterized in that: Chamfer structures are provided at the contact angles between the wall segment web (21) and the wall segment flange plate (22), the four corners of the wall segment flange plate (22), and the contact angles between the wall segment flange plate (22) and the avoidance groove (26).

3. An assembly method of the recyclable assembled composite ground-connected wall according to claim 2, characterized in that: The specific steps are: S1. Use the milling equipment to form a groove at the designed position of the ground-connected wall of the foundation pit project; S2. When hoisting the steel sheet pile (1), apply lubricant on the inside and outside of the steel sheet pile (1), and apply ointment on the positive locking mouth (13) and the reverse locking mouth (14) of the steel sheet pile (1); align the positive locking mouth (13) of the flange plate (12) of the steel sheet pile (1) with the reverse locking mouth (14) of the adjacent constructed steel sheet pile (1), and use a lifting machine to slowly place the steel sheet pile (1) into the ground-connected wall groove section. During the lowering process, ensure the verticality of the steel sheet pile (1), and form a closed steel plate grid between adjacent steel sheet piles (1); S3, apply lubricant on the surface of the prefabricated wall segment (2), use a lifting machine to lift the prefabricated wall segment (2) at the four lifting rings (24), and slowly place the prefabricated wall segment (2) vertically into the closed steel plate grid formed between adjacent steel sheet piles (1), align the avoidance groove (26) at the wall segment flange plate (22) with the connection between the positive locking mouth (13) and the reverse locking mouth (14) of the steel sheet pile (1), insert a mud pipe into the ground-connected wall inclinometer tube (23) at the center of the wall segment web (21), and use an external suction pump to pump out the sediment at the bottom during the sinking process of the prefabricated wall segment (2). After the sinking of the prefabricated wall segment (2) is completed, an inclinometer device is set in the ground-connected wall inclinometer tube (23) at the center of the wall segment web (21) to monitor the verticality at any time; S4, using a slurry pump to pump the pre-prepared fluidized solidified soil (3) into the gap between the steel sheet pile (1) and the prefabricated wall section (2), and fill it to the top surface of the ground-connected wall groove section; S5, continue to assemble the next ground-connected wall along the direction of the ground-connected wall according to steps S1, S2, S3 and S4, inject cement slurry through the grouting pipe (15) to fill the gap between the ground-connected wall groove wall and the steel sheet pile 1, and after the grouting is completed, insert a PVC pipe with a wooden plug into the grouting pipe (15); S6. Continuously assemble the composite ground-anchored wall until the entire ground-anchored wall structure is formed.

4. The assembly method of a recyclable assembled composite ground-connected wall according to claim 3, characterized in that: In step S3, during the lowering process of the prefabricated wall section, a vibration device is used to assist the sinking of the wall; the height of the steel sheet pile (1) is greater than the depth of the ground-connected wall trench section, and after the prefabricated wall section (2) is hoisted, a vibration hammering machine is used to hammer the steel sheet pile (1) to below the top surface of the impermeable layer.

5. The assembly method of the recyclable assembled composite ground-connected wall according to claim 4, characterized in that: In step S6, after the assembly is completed, welding is performed on the surface of the steel sheet pile (1) and the support system in the foundation pit is installed.

6. A method for dismantling the recyclable assembled composite ground-connected wall according to claim 2, characterized in that: The specific steps are: P1. Preliminary lifting is performed on the top of the prefabricated wall segment (2) using a vibrating lifting device to loosen the prefabricated wall segment (2) and reduce the bonding force between the surface of the prefabricated wall segment (2) and surrounding materials; P2. Remove the inclinometer in the inclinometer tube (23) of the ground-connected wall of the prefabricated wall segment (2), use a lifting machine to lift the prefabricated wall segment (2) at the four lifting rings (24), and slowly pull up the prefabricated wall segment (2); after pulling up a certain distance, use a pneumatic pick to break and remove the fluidized solidified soil (3) remaining in the through holes (25) corresponding to the wall segment flange plate (22), and then insert a shoulder pole beam into the through holes (25) corresponding to the wall segment flange plate (22) to maintain the height of the prefabricated wall segment (2); use a mud pump to pump the pre-prepared fluidized solidified soil (3) through the ground-connected wall inclinometer tube (23) into the vacancy at the bottom of the prefabricated wall segment (2) after it is pulled out; after the fluidized solidified soil (3) hardens, pull out the shoulder pole beam, and continue to pull up to the next height using the lifting machine; repeat until the prefabricated wall segment (2) is completely pulled out; P3, insert a PVC pipe with a wooden plug into the grouting pipe (15), and when the prefabricated wall section (2) is removed, use a lifting device to remove the steel sheet piles (1) between the prefabricated wall sections (2), poke open the wooden plug at the PVC pipe in the grouting pipe (15), and simultaneously inject cement slurry through the PVC pipe in the grouting pipe (15) to reduce the impact of the removal of the steel sheet piles (1) on the surrounding environment; P4. Remove the prefabricated wall segments (2) and the steel sheet piles (1) in sequence according to step P1, step P2, and step P3 until all the composite ground-connected walls are removed.

7. A method for dismantling a recyclable assembled composite ground-connected wall according to claim 6, characterized in that: In order to speed up the demolition of the ground-anchored wall, multiple construction work surfaces are carried out along the length of the ground-anchored wall.

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