Prefabricated retaining wall structure

Abstract

This utility model relates to the technical field of foundation pit support, and in particular to a prefabricated assembled retaining wall structure. It includes H-steel columns installed at equal intervals at the top of the foundation pit capping beam along its extension direction. Retaining wall units are installed between adjacent H-steel columns, with backfill soil blocked behind each unit. The retaining wall units are sealed to the H-steel columns and the foundation pit capping beam. The thickness of the retaining wall unit is less than the clear distance between the two flanges of the H-steel column. A mating joint is provided between the front of the retaining wall unit and its corresponding flange, and fastening kits for positioning and fixing the retaining wall unit are provided at the mating joint. This utility model's prefabricated assembled retaining wall structure uses a prefabricated unit on-site assembly structure instead of a traditional cast-in-place concrete structure, which not only reduces construction costs and improves construction efficiency, but also facilitates dismantling after temporary support use. The prefabricated retaining wall units are constrained and fixed using fastening kits, increasing stability, and the operation is simple and safe.

Description

Technical Field

[0001] This utility model relates to the technical field of foundation pit engineering, and in particular to a prefabricated assembled retaining wall structure. Background Technology

[0002] A retaining wall for an excavation pit is a temporary or permanent support structure used in excavation pit engineering to support the soil wall of the pit, prevent soil collapse, and control the deformation of the surrounding strata. It is a core component of the excavation pit support system, ensuring the safety and stability of the excavation pit during construction, while protecting the safety of surrounding buildings, underground facilities, and personnel.

[0003] Traditional retaining walls are constructed using monolithic concrete casting and are rigidly connected to the underlying foundation structure (the foundation pit capping beam). This type of retaining wall requires on-site reinforcement binding, formwork erection, and concrete pouring, followed by formwork removal once the concrete has reached its strength. This process involves large quantities of cast-in-place concrete, high-strength reinforcement requirements, and reliance on skilled workers. Simultaneous construction with the capping beam and formwork erection is cumbersome, making construction time-consuming and labor-intensive. It also necessitates the use of large trenching machines, drilling rigs, and concrete pumping equipment, resulting in high rental and maintenance costs. If temporary support is required, demolishing the cast-in-place wall necessitates demolition work, generating construction waste and potentially disturbing the surrounding soil. Utility Model Content

[0004] In order to reduce construction costs, improve construction efficiency, and facilitate the dismantling of temporary supports after use, this utility model provides a prefabricated assembled retaining wall structure.

[0005] The prefabricated assembled retaining wall structure provided by this utility model adopts the following technical solution: A prefabricated retaining wall structure includes H-steel columns installed at equal intervals on the top of the foundation pit capping beam along the extension direction of the foundation pit capping beam. A retaining wall unit is installed between two adjacent H-steel columns. The back of the retaining wall unit is used to block backfill soil. The retaining wall unit is sealed to the H-steel column and the foundation pit capping beam. The thickness of the retaining wall unit is less than the clear distance between the two flange plates of the H-steel column. A mating joint is left between the front of the retaining wall unit and the corresponding flange plate. Fastening kits for positioning and fixing the retaining wall unit are provided at the mating joint.

[0006] By adopting the above technical solution, the prefabricated retaining wall structure of this utility model uses a prefabricated unit on-site assembly structure instead of a traditional cast-in-place concrete structure, which not only reduces construction costs and improves construction efficiency, but also makes it easy to dismantle after temporary support is used; the prefabricated retaining wall unit is constrained and fixed with fastening kits, which increases stability, and is simple to operate and safe and reliable.

[0007] Preferably, the fastening kit includes a fixing seat fixed to the outside of the flange plate, a right-angle base detachably inserted into the mating seam, a wedge block fixed to the inside corner of the right-angle base, the inclined surface of the wedge block being used to contact the end of the flange plate, a screw fixed to the side of the right-angle base near the fixing seat, a slot is provided on the fixing seat, the screw slides through the slot, and a preload nut is threaded on the screw, the preload nut being located on the side of the fixing seat away from the right-angle base.

[0008] By adopting the above technical solution, the front end of the right-angle base is inserted into the mating joint and further pressed until the wedge block is squeezed to the maximum extent. At this time, the pre-tightening nut is tightened with a wrench to make the wedge block as tight as possible, so as to completely constrain the freedom of the front and rear gap of the retaining wall unit. The operation is simple. When disassembly is required, the pre-tightening nut is loosened and removed.

[0009] Preferably, a fastening nut is also threaded onto the screw, and the fastening nut is located on the side of the preload nut away from the fixed seat.

[0010] By adopting the above technical solution, the fastening nut is used to suppress the loosening of the pre-tightening nut and improve the stability of the right-angle base.

[0011] Preferably, the screw is also threaded with a release nut, which is located between the fixed seat and the right-angle base.

[0012] By adopting the above technical solution, when it is necessary to dismantle the retaining wall unit, after loosening the fastening nut and the pre-tightening nut, tighten the release nut. The release nut will drive the wedge block out of the mating joint, which is convenient for dismantling.

[0013] Preferably, the fixing seat includes a fixing plate that is vertically fixed to the outer wall of the flange, a rib plate is fixed between the fixing plate and the flange, and a slot is formed on the fixing plate.

[0014] By adopting the above technical solution, the fixed base has a simple structure, is easy to manufacture, and the slots are easy to open.

[0015] Preferably, the retaining wall unit has several sealing grooves on its sides and bottom, and sealing strips are embedded and fixed in the sealing grooves.

[0016] By adopting the above technical solution, the sealing strip is embedded in the sealing groove, which facilitates the sealing of the side and bottom surfaces of the retaining wall and achieves a good sealing effect.

[0017] Preferably, the sealing strip is a water-swellable sealing strip.

[0018] By adopting the above technical solution, the water-swellable sealing strip expands upon contact with water, thus improving the sealing effect.

[0019] Preferably, multiple receiving slots are arranged in a matrix behind the retaining wall unit, and reinforcing ribs are formed between the receiving slots.

[0020] By adopting the above technical solution, after the backfill soil fills the receiving trench, the retaining wall unit will also have downward pressure in addition to lateral pressure, so as to ensure the stability of the retaining wall unit after installation in conjunction with its own weight.

[0021] Preferably, pre-embedded bolts are pre-embedded at the top of the foundation pit capping beam, and the H-steel column is fixed to the foundation pit capping beam by the pre-embedded bolts.

[0022] By adopting the above technical solution, it is easy to fix the H-steel column on the top of the foundation pit cap beam, thereby improving construction efficiency. Attached Figure Description

[0023] Figure 1 This is a side view of a prefabricated retaining wall structure according to an embodiment of the present invention.

[0024] Figure 2 This is a front view of the prefabricated retaining wall structure according to an embodiment of this utility model.

[0025] Figure 3 This is a structural schematic diagram of the retaining wall unit according to an embodiment of the present utility model.

[0026] Figure 4 This is a structural schematic diagram of the fastening kit according to an embodiment of the present invention.

[0027] Explanation of reference numerals in the attached drawings: 1. Pit sidewall; 10. Pit capping beam; 2. H-beam column; 20. Embedded bolt; 3. Retaining wall unit; 30. Sealing groove; 31. Receiving groove; 32. Reinforcing rib; 4. Sealing strip; 5. Fastening kit; 50. Fixing seat; 500. Fixing plate; 5000. Slot; 501. Rib plate; 51. Right-angle base; 52. Wedge block; 53. Screw; 54. Preload nut; 55. Fastening nut; 56. Retrieval nut. Detailed Implementation

[0028] The following combination Figures 1-4 The present invention will be described in further detail below.

[0029] This utility model discloses a prefabricated assembled retaining wall structure. (Refer to...) Figures 1-4 The top of the foundation pit sidewall 1 is cast with a foundation pit cap beam 10. A prefabricated retaining wall structure is installed on the top of the foundation pit cap beam 10. The retaining wall structure includes H-steel columns 2 that are vertically arranged at equal intervals along the extension direction of the foundation pit cap beam 10. The bottom of the H-steel columns 2 is fixed by pre-embedded bolts 20 embedded in the foundation pit cap beam 10.

[0030] A retaining wall unit 3 is installed between two adjacent H-steel columns 2. The side of the retaining wall unit 3 closest to the backfill soil is designated as the rear of the retaining wall unit 3, and the side of the retaining wall unit 3 away from the backfill soil is designated as the front of the retaining wall unit 3. The left and right ends of the retaining wall unit 3 are inserted into the openings of the H-steel columns 2. Two sealing grooves 30 are respectively provided on the left and right sides and the bottom surface of the retaining wall unit 3.

[0031] A waterproof sealing strip 4 is embedded in the sealing groove 30. In this embodiment, the sealing strip 4 is a water-swellable sealing strip. After the retaining wall unit 3 is fully fitted and installed with the H-steel column 2, the side sealing strip 4 is tightly fitted with the side wall of the web of the H-steel column 2, and the bottom sealing strip 4 is tightly fitted with the top surface of the foundation pit cap beam 10, forming a waterproof sealing structure to prevent backfill soil from seeping into the foundation pit.

[0032] Multiple receiving slots 31 are arranged in a matrix behind the retaining wall unit 3. Reinforcing ribs 32 are formed between adjacent receiving slots 31. After the backfill soil fills the receiving slots 31, it exerts downward pressure on the retaining wall unit 3 in addition to lateral pressure, in order to cooperate with the weight of the retaining wall unit 3 to ensure the stability of the retaining wall unit 3 after installation.

[0033] The thickness of retaining wall unit 3 is less than the clear distance between the two flange plates of H-steel column 2, so as to facilitate the hoisting of retaining wall unit 3 into the opening slot of H-steel column 2. In order to facilitate the subsequent positioning of retaining wall unit 3, during hoisting, the back of retaining wall unit 3 should be as close as possible to the corresponding flange plate, and a mating joint should be left between the front of retaining wall unit 3 and the corresponding flange plate.

[0034] The retaining wall structure also includes a fastening kit 5 used at the joint to eliminate the gap between the rear of the retaining wall unit 3 and the corresponding flange plate, and to position and reinforce the retaining wall unit 3. The fastening kit 5 includes a fixing seat 50 fixed to the end of the flange plate near the front of the retaining wall unit 3. The fixing seat 50 includes a fixing plate 500 vertically fixed to the outside of the flange plate. The height of the fixing plate 500 is the same as the height of the H-steel column 2. Multiple ribs 501 are fixed at equal intervals between the fixing plate 500 and the flange plate. Multiple slots 5000 are evenly opened on the fixing plate 500 along the height direction.

[0035] Multiple right-angle bases 51 are evenly installed along the height direction at the joint. The right-angle base 51 is an L-shaped plate structure. A wedge block 52 is fixed at the inside corner of the right-angle base 51. The inclined surface of the wedge block 52 is used to contact the end of the flange plate. The wedge block 52 serves to increase the structural strength of the right-angle base 51 and also serves to cooperate with the H-steel column 2 to squeeze the right-angle base 51, thereby pressing and fixing the retaining wall unit 3.

[0036] A screw 53 is horizontally fixed to the side of the right-angle base 51 near the fixing plate 500. The screw 53 is perpendicular to the fixing plate 500 and slides through the slot 5000. A preload nut 54, a fastening nut 55, and a release nut 56 are threaded onto the screw 53. The preload nut 54 and the fastening nut 55 are located on the side of the fixing plate 500 away from the right-angle base 51. The preload nut 54 is located between the fastening nut 55 and the fixing plate 500, and the release nut 56 is located between the fixing plate 500 and the right-angle base 51.

[0037] The implementation principle of the prefabricated retaining wall structure in this embodiment of the utility model is as follows: H-steel columns 2 are fixed to the foundation pit cap beam 10 by pre-embedded bolts 20. The retaining wall unit 3 equipped with sealing strips 4 is hoisted between two adjacent H-steel columns 2, so that the back of the retaining wall unit 3 is as close as possible to the corresponding flange plate. When positioning and fixing the retaining wall unit 3, first loosen the pre-tightening nut 54 and the fastening nut 55, insert the front end of the right-angle base 51 into the mating joint, and further press it until the wedge block 52 is maximally tightened. At this time, use a wrench to tighten the pre-tightening nut 54 so that the wedge block 52 is at its tightest, so as to completely constrain the freedom of the front and rear gap of the retaining wall unit 3. Then tighten the fastening nut 55 to prevent loosening. When it is necessary to remove the retaining wall unit 3, loosen the fastening nut 55 and the pre-tightening nut 54 in sequence, and then tighten the release nut 56. Since the release nut 56 is on the other side of the fixing plate 500, after tightening, the release nut 56 drives the wedge block 52 to exit the mating joint, which facilitates disassembly.

[0038] The prefabricated retaining wall structure of this utility model adopts a prefabricated unit on-site assembly structure instead of a traditional cast-in-place concrete structure, which not only reduces construction costs and improves construction efficiency, but also makes it easy to dismantle after temporary support is used. The prefabricated retaining wall unit 3 is constrained and fixed by fastening kit 5 to increase stability. The fastening kit 5 has the characteristics of quick tightening and quick dismantling, and is easy to operate and safe and reliable.

[0039] The above are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape and principle of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A precast retaining wall structure, characterized by: The structure includes H-steel columns (2) installed at equal intervals on the top of the foundation pit capping beam (10) along the extension direction of the foundation pit capping beam (10). A retaining wall unit (3) is installed between two adjacent H-steel columns (2). The back of the retaining wall unit (3) is used to block backfill soil. The retaining wall unit (3) is sealed to the H-steel column (2) and the foundation pit capping beam (10). The thickness of the retaining wall unit (3) is less than the net distance between the two flange plates of the H-steel column (2). A mating joint is left between the front of the retaining wall unit (3) and the corresponding flange plate. A fastening kit (5) for positioning and fixing the retaining wall unit (3) is provided at the mating joint.

2. The prefabricated retaining wall structure according to claim 1, wherein: The fastening kit (5) includes a fixing seat (50) fixed to the outside of the flange plate, a right-angle base (51) detachably inserted into the mating seam, a wedge block (52) fixed to the inside corner of the right-angle base (51), the inclined surface of the wedge block (52) is used to contact the end of the flange plate, a screw (53) is fixed to the side of the right-angle base (51) near the fixing seat (50), a slot (5000) is opened on the fixing seat (50), the screw (53) slides through the slot (5000), a preload nut (54) is threaded on the screw (53), the preload nut (54) is located on the side of the fixing seat (50) away from the right-angle base (51).

3. The prefabricated retaining wall structure according to claim 2, wherein: A fastening nut (55) is also threaded onto the screw (53), and the fastening nut (55) is located on the side of the preload nut (54) away from the fixed seat (50).

4. The prefabricated retaining wall structure according to claim 3, wherein: A release nut (56) is also threaded onto the screw (53), and the release nut (56) is located between the fixed seat (50) and the right-angle base (51).

5. The prefabricated retaining wall structure according to claim 4, wherein: The mounting base (50) includes a mounting plate (500) that is vertically fixed to the outer wall of the flange plate. A rib (501) is fixed between the mounting plate (500) and the flange plate. A slot (5000) is formed on the mounting plate (500).

6. The prefabricated retaining wall structure according to claim 1, wherein: The retaining wall unit (3) has several sealing grooves (30) on its side and bottom, and a sealing strip (4) is embedded and fixed in the sealing groove (30).

7. The prefabricated retaining wall structure according to claim 1 or 6, wherein: The sealing strip (4) is a water-swellable sealing strip.

8. The prefabricated retaining wall structure according to claim 1, wherein: The retaining wall unit (3) has multiple receiving slots (31) arranged in a matrix behind it, and reinforcing ribs (32) are formed between the receiving slots (31).

9. The prefabricated retaining wall structure according to claim 1, wherein: The top of the foundation pit capping beam (10) is pre-embedded with pre-embedded bolts (20), and the H-steel column (2) is fixed to the foundation pit capping beam (10) by the pre-embedded bolts (20).

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