A kind of full prefabricated steel underground continuous wall structure and construction method of dismantling and recycling

Abstract

The application discloses a kind of full prefabricated steel underground continuous wall structure and construction method of dismantling and recycling, belong to foundation pit engineering field, a kind of full prefabricated steel underground continuous wall structure of dismantling and recycling, including soil body and foundation trench, the foundation trench is opened in soil body surface, the bottom surface of the foundation trench is provided with groove section, bottom wall body, standard section wall body and top wall body are sequentially arranged in the groove section from bottom to top, the bottom wall body and top wall body are all fixedly connected with standard section wall body;The bottom wall body, standard section wall body and top wall body respectively include three wall body longitudinal beams, wall body keel is fixedly connected between the wall body longitudinal beam, it can be realized, hollow steel structure is replaced traditional reinforced concrete structure, reduce the weight of the notice to reduce wall size, maintain the advantage of the stiffness of traditional underground continuous wall structure, while ensuring that it has good operability in construction site, while providing recycling scheme after use.

Description

A Demountable and Recyclable Fully Precast Steel Diaphragm Wall Structure and Construction Method Technical Field

[0001] This invention relates to the field of foundation pit engineering, and more specifically, to a detachable and recyclable prefabricated steel diaphragm wall structure and its construction method. Background Technology

[0002] In traditional deep foundation pit engineering, temporary support structures are usually required to ensure the safety of the foundation pit, such as underground continuous walls or piles. The above-mentioned solutions are simple and intuitive in terms of mechanical analysis, and convenient and effective in practical operation, so their application is very mature.

[0003] However, according to current specifications, the contribution of temporary retaining structures is not considered in the design of underground permanent structures (although temporary retaining structures objectively provide continuous support for the permanent structure). This results in the thickness of the exterior walls of underground buildings far exceeding theoretical requirements, causing a huge waste of building materials and construction time, and also resulting in a large amount of reinforced concrete structure being permanently buried underground, forming black pollution that is difficult to deal with. Therefore, for shallower temporary retaining structures, sheet piles or steel pipe piles can be used. This involves inserting steel sheets or pipes into the soil as temporary support structures and then pulling them out for recycling after the main structure is completed. This method can effectively solve the waste and pollution problems caused by temporary retaining structures, but it cannot be applied to deeper temporary retaining structures.

[0004] In addition to the aforementioned problems of waste and pollution that are difficult to solve, existing fully prefabricated diaphragm walls also have the following issues that make large-scale application on construction sites difficult:

[0005] 1. Fully prefabricated diaphragm walls are large in volume and weight, making transportation and hoisting difficult.

[0006] 2. The assembly process takes place underground, making it difficult to guarantee the quality of the assembly process. Summary of the Invention

[0007] 1. Technical problems to be solved

[0008] To address the problems existing in the prior art, the purpose of this invention is to provide a detachable and recyclable fully prefabricated steel diaphragm wall structure and construction method. It can replace the traditional reinforced concrete structure with a hollow steel structure, reduce the self-weight and reduce the wall size, maintain the high rigidity advantage of the traditional diaphragm wall structure, ensure good operability on the construction site, and provide a solution for recycling and reuse after use.

[0009] 2. Technical Solution

[0010] To solve the above problems, the present invention adopts the following technical solution.

[0011] A detachable and recyclable prefabricated steel underground continuous wall structure includes soil and a foundation trench. The foundation trench is opened on the surface of the soil, and a trench section is opened on the bottom surface of the foundation trench. A bottom wall, a standard section wall and a top wall are arranged sequentially from bottom to top in the trench section. The bottom wall and the top wall are fixedly connected to the standard section wall.

[0012] The bottom wall, standard section wall, and top wall each include three longitudinal wall beams. Wall studs are fixedly connected between the longitudinal wall beams. Wall panels are fixedly connected to the outer walls of the longitudinal wall beams and wall studs. Connecting components are provided on the top surfaces of the bottom wall and standard section wall. Limiting components are provided on the bottom wall, standard section wall, and top wall.

[0013] Furthermore, the connecting assembly includes insertion holes, which are respectively opened on the side walls of the longitudinal beams of the bottom wall and the standard section wall. The insertion holes penetrate the top end face of the longitudinal beam. Two reinforcing plates are symmetrically fixedly connected to the inner wall of the longitudinal beam near the top. The side walls of the reinforcing plates are respectively provided with pin holes. The top surface of the wall panel is provided with a reserved hole at the insertion hole. The front and rear side walls of the wall panel are respectively provided with three storage holes, which are concentric with the pin holes. The bottom front and rear sides of the standard section wall and the top wall are respectively symmetrically fixedly connected with three ear plates, which correspond to the reserved holes.

[0014] Furthermore, the limiting component includes a first card plate, with two first card plates symmetrically arranged above and below each other. The first card plates are fixedly connected to the right side wall of the rightmost longitudinal beam of the wall, and a second card plate corresponding to the first card plate is fixedly connected to the left side wall of the leftmost longitudinal beam of the wall. Both the first card plate and the second card plate are U-shaped.

[0015] Furthermore, two lifting lugs are symmetrically fixedly connected to the wall panel at the top of the top wall.

[0016] Furthermore, several water-stop grooves are provided on the wall panels at the bottom of the wall and the top of the standard section wall, and several water-stop protrusions are fixedly connected to the bottom surfaces of the standard section wall and the top wall, with the water-stop grooves and water-stop protrusions matching each other.

[0017] Furthermore, a number of evenly distributed short piles are fixedly connected to the bottom surface of the wall panel at the bottom of the bottom wall, and the short piles are arranged in a conical shape.

[0018] Furthermore, guide walls are cast on the front and rear side walls of the foundation trench, and the guide walls are flush with the soil.

[0019] A construction method for a detachable and recyclable fully prefabricated steel diaphragm wall structure, comprising the following steps:

[0020] S1: First, excavate a foundation trench at the designated location in the soil, and then pour guide walls on the sidewalls of the foundation trench.

[0021] S2: Excavate a trench section at the bottom of the foundation trench. The width of the trench section should be 90%-100% of the wall thickness, and the length of the trench section should be 120%-130% of the wall length.

[0022] S3: Use mud slurry to protect the walls in the trench section, and then excavate to the required depth of the wall;

[0023] S4: After cleaning the bottom of the trench section, use external hoisting equipment to place the bottom wall on the top of the trench and press it into the trench section;

[0024] S5: When the top surface of the bottom wall is 500mm-1200mm above the top of the foundation trench, hoist and assemble the standard wall section above it and tighten it with prefabricated bolts. Then repeat the above steps to form the entire wall, and then excavate the soil and build the main structure.

[0025] S6: After the main structure is completed, the wall can be pulled out and recycled. After each section of the wall is pulled out of the ground, the prefabricated bolts can be removed before the next section is pulled out. After all the walls are pulled out, the trenches can be backfilled.

[0026] 3. Beneficial effects

[0027] Compared with the prior art, the advantages of this invention are:

[0028] (1) This technical solution retains the structural form of traditional underground continuous walls in a macroscopic way by cooperating with the wall longitudinal beams, wall panels and limiting components, thus ensuring the mechanical performance and waterproof and seepage-resistant performance of the enclosure structure.

[0029] (2) This technical solution uses a separate prefabricated steel structure to replace the reinforced concrete structure through the cooperation between the bottom wall, standard section wall, top wall and connecting components, thereby reducing the self-weight and thickness of a single wall and enhancing the operability on the construction site.

[0030] (3) By transferring a large number of on-site construction operations to the factory, the construction progress is accelerated while meeting the requirements of green construction, and it also provides the possibility for the standardization and industrialization of related processes. Attached Figure Description

[0031] Figure 1 is a schematic diagram of the structure of the present invention after assembly in soil.

[0032] Figure 2 is a schematic diagram of the bottom wall structure in this invention;

[0033] Figure 3 is a structural schematic diagram of the standard section wall in this invention;

[0034] Figure 4 is a schematic diagram of the top wall structure in this invention;

[0035] Figure 5 is a schematic diagram of the standard section wall structure from below in this invention;

[0036] Figure 6 is an enlarged view of point A in Figure 2 of this invention;

[0037] Figure 7 is an enlarged view of section B in Figure 5 of this invention.

[0038] Explanation of the labels in the diagram:

[0039] 1. Soil; 2. Trench section; 3. Bottom wall; 4. Standard section wall; 5. Top wall; 6. Foundation trench; 7. Longitudinal beam of the wall; 8. Wall joists; 9. Wall panel; 10. Insertion hole; 11. Reinforcing plate; 12. Shaft pin hole; 13. Reserved hole; 14. Storage hole; 15. Ear plate; 16. Lifting lug; 17. First clamping plate; 18. Second clamping plate; 19. Water-stop groove; 20. Water-stop protrusion; 21. Short pile; 22. Guide wall. Detailed Implementation

[0040] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0041] Example 1:

[0042] Please refer to Figures 1-7. A detachable and recyclable prefabricated steel underground continuous wall structure includes a soil body 1 and a foundation trench 6. The foundation trench 6 is opened on the surface of the soil body 1. A trench section 2 is opened on the bottom surface of the foundation trench 6. Guide walls 22 are poured on the front and rear side walls of the foundation trench 6 respectively. The guide walls 22 are flush with the soil body 1, which can prevent the soil at the edge of the foundation trench 6 from falling off during the wall assembly process and causing backfilling of the trench section 2. The trench section 2 is arranged from bottom to top as a bottom wall 3, a standard section wall 4, and a top wall 5. The bottom wall 3 and the top wall 5 are fixedly connected to the standard section wall 4. Two lifting lugs 16 are symmetrically fixedly connected to the wall panel 9 at the top of the top wall 5.

[0043] The bottom wall 3, standard section wall 4 and top wall 5 each include three wall longitudinal beams 7, and wall studs 8 are fixedly connected between the wall longitudinal beams 7. Wall panels 9 are fixedly connected to the outer walls of the wall longitudinal beams 7 and the wall studs 8. Connecting components are provided on the top surface of the bottom wall 3 and standard section wall 4. Limiting components are provided on the bottom wall 3, standard section wall 4 and top wall 5 respectively.

[0044] Using prefabricated steel structures instead of reinforced concrete structures reduces the weight and thickness of individual wall sections, enhances on-site operability, and accelerates construction progress while meeting green construction requirements by transferring a large number of on-site construction operations to the factory. It also makes it possible to standardize and industrialize related processes.

[0045] Referring to Figures 2 and 6, the connecting assembly includes a socket 10, which is respectively opened on the side wall of the longitudinal beam 7 of the bottom wall 3 and the standard section wall 4. The socket 10 penetrates the top end face of the longitudinal beam 7. Two reinforcing plates 11 are symmetrically fixedly connected to the inner wall of the longitudinal beam 7 near the top. The side wall of the reinforcing plate 11 is provided with axle pin holes 12. The top surface of the wall panel 9 is provided with a reserved hole 13 at the socket 10. The front and rear side walls of the wall panel 9 are respectively provided with three storage holes 14. The storage holes 14 are concentric with the axle pin holes 12. The bottom front and rear of the standard section wall 4 and the top wall 5 are respectively symmetrically fixedly connected with three ear plates 15. The ear plates 15 correspond to the reserved holes 13.

[0046] Referring to Figures 2 and 7, the limiting component includes a first locking plate 17, with two first locking plates symmetrically arranged vertically. The first locking plates 17 are fixedly connected to the right side wall of the rightmost longitudinal beam 7. The left side wall of the leftmost longitudinal beam 7 is fixedly connected to a second locking plate 18 corresponding to the first locking plate 17. Both the first locking plates 17 and the second locking plates 18 are U-shaped. Through the cooperation between the longitudinal beam 7, the wall panel 9, and the limiting component, the structural form of the traditional underground continuous wall is preserved macroscopically, ensuring the mechanical performance and waterproof and seepage-resistant performance of the enclosure structure.

[0047] Referring to Figures 5 and 7, several water-stop grooves 19 are provided on the wall panels 9 at the top of the bottom wall 3 and the standard section wall 4. Several water-stop protrusions 20 are fixedly connected to the bottom surfaces of the standard section wall 4 and the top wall 5. The water-stop grooves 19 and the water-stop protrusions 20 match each other. After the bottom wall 3, the standard section wall 4 and the top wall 5 are assembled, the water-stop grooves 19 and the water-stop protrusions 20 are in an engaged state, which enhances the sealing between the walls and has a good anti-seepage effect. This method can ensure the waterproof reliability of the joint.

[0048] Referring to Figure 2, several evenly distributed short piles 21 are fixedly connected to the bottom surface of the wall panel 9 at the bottom of the bottom wall 3. The short piles 21 are set in a conical shape. By setting the short piles 21, the friction between the bottom wall 3 and the soil 1 can be increased, thereby improving its stability. On the other hand, it can also adapt to the unevenness at the bottom of the trench section 2.

[0049] A construction method for a detachable and recyclable fully prefabricated steel diaphragm wall structure, comprising the following steps:

[0050] S1: First, excavate the foundation trench 6 at the designated location of soil 1, and pour guide wall 22 on the side wall of the foundation trench 6;

[0051] S2: Excavate trench section 2 at the bottom of foundation trench 6. The width of trench section 2 should be 90%-100% of the wall thickness, and the length of trench section 2 should be 120%-130% of the wall length.

[0052] S3: Use mud slurry to protect the walls in section 2, and then excavate to the required depth of the wall;

[0053] S4: After cleaning the bottom of the trench section 2, when using external hoisting equipment, electromagnetic chucks or magnetic chucks should be used to first place the bottom wall 3 on the top of the trench 6 and press it into the trench section 2.

[0054] S5: When the top surface of the bottom wall 3 is 500mm-1200mm above the top of the foundation trench 6, hoist and assemble the standard section wall 4 above it and tighten it with prefabricated bolts. Then repeat the above steps to form the entire wall. After that, excavate the soil 1 and build the main structure.

[0055] S6: After the main structure is completed, the wall can be pulled out and recycled. After each section of the wall is pulled out of the ground, the prefabricated bolts can be removed before the next section is pulled out. After all the walls are pulled out, the trench section 2 will be backfilled.

[0056] In use: First, excavate the foundation trench 6 at the designated location in the soil 1, and pour guide walls 22 on the sidewalls of the foundation trench 6. After the guide walls 22 have solidified, excavate section 2 at the bottom of the foundation trench 6. The width of section 2 should be 90%-100% of the wall thickness, and the length of section 2 should be 120%-130% of the wall length. Use mud slurry to protect the walls of section 2. Then excavate to the required depth of the wall. After cleaning the bottom of section 2, use external hoisting equipment, such as electromagnetic chucks or magnetic chucks, to place the bottom wall 3 on top of the foundation trench 6 and press it into section 2. Wait until the top surface of the bottom wall 3 is 500m above the top of the foundation trench 6. When the height is 1200mm, the standard section wall 4 is hoisted and assembled above it. The ear plate 15 at the bottom of the standard section wall 4 is inserted into the reserved hole 13 on the bottom wall 3. At this time, the hole, shaft pin hole 12 and storage hole 14 on the ear plate 15 are on the same axis. Then, the prefabricated bolts are inserted and tightened. Then, the above steps are repeated to install the standard section wall 4 and the top wall 5 to form a whole wall. Then, the soil 1 is excavated and the main structure is built. After the main structure is completed, the wall can be pulled out and retrieved. After each section of the wall is pulled out of the ground, the prefabricated bolts can be removed before the next section is pulled out. After all the walls are pulled out, the trench 2 is backfilled.

[0057] If multiple rows of walls are required, the first card plate 17 and the second card plate 18 can be used to limit and lock the walls on both sides, ensuring that the walls are firm while also making the walls on both sides in close contact and enhancing their sealing effect.

[0058] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concepts, should be covered within the scope of protection of the present invention.

Claims

1. A detachable and recyclable precast steel diaphragm wall structure, comprising soil (1) and a foundation trench (6), the foundation trench (6) being formed on the surface of the soil (1), characterized in that: The bottom surface of the foundation trench (6) is provided with a trench section (2). From bottom to top, a bottom wall (3), a standard section wall (4), and a top wall (5) are arranged within the trench section (2). The bottom wall (3) and the top wall (5) are both fixedly connected to the standard section wall (4). Each of the bottom wall (3), standard section wall (4), and top wall (5) includes three longitudinal wall beams (7). Wall studs (8) are fixedly connected between the longitudinal wall beams (7). Wall panels (9) are fixedly connected to the outer walls of the wall keel (8). Connecting components are provided on the top surfaces of the bottom wall (3) and the standard section wall (4). Limiting components are provided on the bottom wall (3), the standard section wall (4), and the top wall (5). The limiting components include first locking plates (17). Two first locking plates (17) are symmetrically arranged on the top and bottom. The first locking plates (17) are fixedly connected to the right side wall of the rightmost wall longitudinal beam (7). The leftmost wall longitudinal beam (7) 7) A second card (18) corresponding to the first card (17) is fixedly connected to the left side wall. Both the first card (17) and the second card (18) are U-shaped. The connecting component includes a socket (10). The socket (10) is opened on the side wall of the longitudinal beam (7) of the bottom wall (3) and the standard section wall (4). The socket (10) penetrates the top end face of the longitudinal beam (7). Two reinforcing plates are symmetrically fixedly connected to the inner wall of the longitudinal beam (7) near the top. 11) The side wall of the reinforcing plate (11) is provided with axle pin holes (12), the top surface of the wall panel (9) is provided with a reserved hole (13) at the insertion hole (10), the front and rear side walls of the wall panel (9) are provided with three storage holes (14), the storage holes (14) are concentric with the axle pin holes (12), the bottom front and rear of the standard section wall (4) and the top wall (5) are symmetrically fixed with three ear plates (15), the ear plates (15) correspond to the reserved holes (13).

2. The fully prefabricated steel diaphragm wall structure that can be disassembled and recycled according to claim 1, characterized in that: Two lugs (16) are symmetrically fixedly connected to the wall panel (9) at the top of the top wall (5).

3. The fully prefabricated steel diaphragm wall structure that can be disassembled and recycled according to claim 1, characterized in that: Several water-stop grooves (19) are provided on the wall panel (9) at the top of the bottom wall (3) and the standard section wall (4). Several water-stop protrusions (20) are fixedly connected to the bottom surface of the standard section wall (4) and the top wall (5). The water-stop grooves (19) and the water-stop protrusions (20) match each other.

4. The fully prefabricated steel diaphragm wall structure that can be disassembled and recycled according to claim 1, characterized in that: The bottom wall panel (9) at the bottom of the bottom wall (3) is fixedly connected with several evenly distributed short piles (21), which are arranged in a conical shape.

5. A detachable and recyclable prefabricated steel diaphragm wall structure according to claim 1, characterized in that: The front and rear side walls of the foundation trench (6) are respectively cast with guide walls (22), and the guide walls (22) are flush with the soil (1).

6. A construction method for a detachable and recyclable fully prefabricated steel diaphragm wall structure, characterized in that: The construction method employs a detachable and recyclable fully prefabricated steel diaphragm wall structure as described in any one of claims 1-5. Includes the following steps: S1: First, excavate the foundation trench (6) at the designated location in the soil (1), and pour guide walls (22) on the sidewalls of the foundation trench (6); S2: Excavate the trench section (2) at the bottom of the foundation trench (6). The width of the trench section (2) should be 90%-100% of the wall thickness, and the length of the trench section (2) should be 120%-130% of the wall length; S3: Use mud slurry to protect the wall in the trench section (2), and then excavate to the required depth of the wall; S4: After cleaning the bottom of the trench section (2), use external hoisting equipment to place the bottom wall (22) on the top of the foundation trench (6). 3), and press it into the trench section (2); S5: When the top surface of the bottom wall (3) is 500mm-1200mm above the top of the trench (6), hoist and assemble the standard section wall (4) above it and tighten it with prefabricated bolts. Then repeat the above steps to form the whole wall, and then excavate the soil (1) and build the main structure; S6: After the main structure is built, pull out the wall and recycle it. After each section of the wall is pulled out of the ground, remove the prefabricated bolts and continue to pull out the next section. After all the walls are pulled out, backfill the trench section (2).

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