A recyclable foundation retaining wall and a method of implementing the same

Abstract

The application discloses a recyclable foundation pit retaining wall and an implementation method thereof, which comprises a cement-soil wall, combined type steel core material A, combined type steel core material B, a pull-out steel corbel and a type steel guide wall, combined type steel core materials are alternately arranged in the cement-soil wall in sequence, the combined type steel core materials are divided into the combined type steel core material A and the combined type steel core material B, the combined type steel core material A and the combined type steel core material B, and the two end protrusions of the combined type steel core material A extend into the H-shaped steel flange inside the end part of the combined type steel core material B. The recyclable foundation pit retaining wall and the implementation method thereof adopt the measures of a bottom sealing plate and a rubber gelling belt, so that the cement-soil cannot enter the inside of the type steel core material, the contact area of the type steel core material and the cement-soil is greatly reduced, and the pull-out resistance is effectively reduced. Through the above two measures, the pull-out difficulty of the type steel core material is greatly reduced, the recyclable depth of the type steel core material is not less than 60 m, and the recyclable retaining wall can be applied to the deep foundation pit.

Description

Technical Field

[0001] This invention relates to the field of civil engineering technology, specifically to a recyclable foundation pit retaining wall and its implementation method. Background Technology

[0002] In deep foundation pit engineering in soft soil areas, reinforced concrete retaining walls, represented by diaphragm walls and cast-in-place piles, are the most common retaining structures. However, most foundation pit retaining walls are temporary components, losing their usability once the basement construction is completed. Reinforced concrete retaining walls also suffer from problems such as large amounts of waste concrete and steel bars, high costs, environmental pollution from construction mud discharge, low assembly rates, and slow construction, which restrict the construction level of deep foundation pits in soft soil. Recyclable retaining walls are an important future development trend for soft soil foundation pit retaining. Currently, commonly used recyclable retaining structures include sheet piles and SMW piles, but the bearing capacity of these technologies is far lower than that of reinforced concrete retaining structures such as diaphragm walls or cast-in-place piles, limiting their applicability to shallow foundation pit projects. This significantly restricts the scope of application of recyclable retaining structures. To further improve the green construction level of soft soil foundation pits, reduce project costs, and save resources, this invention provides a recyclable foundation pit retaining wall and its implementation method, which can greatly improve the bearing capacity of the recyclable foundation pit retaining wall and expand the application scenarios of recyclable retaining structures. Summary of the Invention

[0003] The purpose of this invention is to provide a recyclable foundation pit retaining wall and its implementation method to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a recyclable foundation pit retaining wall and its implementation method, comprising a cement-soil wall, a composite steel core material A, a composite steel core material B, a lifting steel bracket, and a steel guide wall. The cement-soil wall contains, alternately arranged composite steel core materials, which are divided into two types: composite steel core material A and composite steel core material B. The two protruding ends of composite steel core material A extend into the H-shaped steel flanges at the ends of composite steel core material B. A lifting steel bracket is provided at the top of composite steel core material A and composite steel core material B. A steel guide wall is provided at the top of the cement-soil wall. The rubber grout-stopping strip and the transverse bracing plate are connected by bolts.

[0005] Preferably, the combined steel core material A includes H-beams, channel steel, transverse bracing plates, convex joints, a bottom sealing plate, and a rubber grout stop strip. The H-beams are located in the middle of the transverse bracing plates, the channel steels are located at both ends of the transverse bracing plates, the flanges of the H-beams and channel steels are connected to the transverse bracing plates, the convex joints are welded to the web of the channel steels, the bottom sealing plate is located at the bottom of the combined steel core material A, and the rubber grout stop strip is disposed in the gap between the flanges of the H-beams and channel steels.

[0006] Preferably, the composite steel core material B includes H-beams, cross braces, a bottom sealing plate, and a rubber grout-stopping strip. The flanges of the H-beams are connected to the cross braces, the bottom sealing plate is located at the bottom of the composite steel core material B, and the rubber grout-stopping strip is disposed in the gaps between the flanges of the H-beams.

[0007] Preferably, the steel guide wall comprises two inverted L-shaped steel box panels.

[0008] Preferably, it includes the following steps:

[0009] Step 1: Construct a cement-soil wall along the edge of the foundation pit, and add a retarder to the cement-soil wall;

[0010] Step 2: Install the steel guide wall on top of the cement-soil wall;

[0011] Step 3: Alternately hoist and place combined steel core material A and combined steel core material B inside the steel guide wall until the entire enclosure wall is completed;

[0012] Step 4: Remove the steel guide wall, excavate the foundation pit and rebuild the basement structure;

[0013] Step 5: Install lifting steel brackets on the sides of combined steel core material A and combined steel core material B;

[0014] Step 6: Drill vertical holes inside the cement-soil wall outside the combined steel core material A and combined steel core material B, and flush the holes with high pressure water.

[0015] Step 7: Use the pulling device to sequentially recover the combined steel core material A and the combined steel core material B.

[0016] Step 8: Grout the gaps left in the cement-soil wall after extraction;

[0017] Step 9: Inspect the recovered combined steel core material A and combined steel core material B, and then apply them to the next foundation pit project.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. The recyclable foundation pit retaining wall and its implementation method can recycle the steel core material inside the retaining wall. After recycling, it can be reused through inspection and maintenance. This technology is economical, green and environmentally friendly, and greatly reduces resource waste.

[0020] 2. The recyclable foundation pit retaining wall and its implementation method provide a composite steel structure as the core material of the retaining wall. Compared with the existing recyclable retaining wall process, the steel core material has a large total cross section and high bearing capacity. Moreover, multiple steel sections are combined and connected into a whole, which greatly enhances the stress stability of the steel core material.

[0021] 3. This recyclable foundation pit retaining wall and its implementation method significantly reduce the pull-out resistance of the steel core material by vertically drilling holes on both sides of the composite steel profile and flushing with high-pressure water. Simultaneously, this patent employs a bottom sealing plate and rubber grout-stopping strips to ensure that cement and soil do not enter the interior of the steel core material, greatly reducing the contact area between the steel core material and the cement and soil, effectively lowering the pull-out resistance. These two measures significantly reduce the difficulty of pulling out the steel core material, and the recyclability depth of the steel core material far exceeds that of existing recyclable retaining wall technologies, making it a recyclable retaining wall suitable for deep foundation pits. Attached Figure Description

[0022] Figure 1 This is a plan view of the enclosure wall of the present invention;

[0023] Figure 2 Figure A shows the combined steel core material of this invention;

[0024] Figure 3 Figure B shows the combined steel core material of this invention;

[0025] Figure 4 This is a diagram of the steel guide wall of the present invention;

[0026] Figure 5 This is a vertical arrangement diagram of the steel bracket and bottom plate for the present invention.

[0027] In the diagram: 1. Cement-soil wall; 2. Composite steel core material; 21. H-beam; 22. Channel steel; 23. Horizontal bracing plate; 24. Bolt; 25. Convex joint; 26. Rubber grout stop; 27. Bottom sealing plate; 3. Steel guide wall; 4. Steel bracket for lifting. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Example 1: This invention provides a technical solution: a recyclable foundation pit retaining wall and its implementation method, comprising a cement-soil wall 1, a combined steel core material 2A, a combined steel core material 2B, a lifting steel bracket 4, and a steel guide wall 3, and a cement-soil mixing pile, a channel-cut cement-soil wall 1, a milled deep mixing cement-soil wall 1, or a jet grouting pile type cement-soil wall 1. The cement-soil wall 1 is arranged along the excavation edge of the foundation pit. A retarder is added inside the cement-soil wall 1. The combined steel core material 2A and the combined steel core material 2B are alternately arranged inside the cement-soil wall 1. The two ends of the combined steel core material 2A extend into the flange of the H-beam 21 at the end of the combined steel core material 2B. The top of the combined steel core material 2A and the combined steel core material 2B is provided with a lifting steel bracket 4. The top of the cement-soil wall 1 is provided with a steel guide wall 3. The rubber grout stop strip 26 and the horizontal bracing plate 23 are connected by bolts 24.

[0030] The composite steel core material 2A includes H-beams 21, channel steel 22, transverse bracing plates 23, convex joints 25, bottom sealing plates 27, and rubber grout-stopping strips 26. The H-beams 21 are located in the middle of the transverse bracing plates 23, and the channel steel 22 is located at both ends of the transverse bracing plates 23. The flanges of the H-beams 21 and channel steel 22 are connected to the transverse bracing plates 23. The convex joints 25 are welded to the web of the channel steel 22. The bottom sealing plate 27 is located at the bottom of the composite steel core material 2A. The rubber grout-stopping strips 26 are located in the gap between the flanges of the H-beams 21 and channel steel 22. The outer surface of the composite steel core material 2A is coated with a lubricant and friction-reducing agent.

[0031] The composite steel core material 2B includes H-beams 21, cross braces 23, bottom sealing plates 27, and rubber grout-stopping strips 26. The flanges of the H-beams 21 are connected to the cross braces 23. The bottom sealing plates 27 are located at the bottom of the composite steel core material 2B. The rubber grout-stopping strips 26 are placed in the gaps between the flanges of the H-beams 21. The outer surface of the composite steel core material 2B is coated with a lubricant and friction-reducing agent.

[0032] The steel guide wall 3 includes two inverted L-shaped steel box panels.

[0033] Example 2 includes the following steps:

[0034] Step 1: Construct cement-soil wall 1 along the edge of the foundation pit, and add retarder to cement-soil wall 1;

[0035] Step 2: Install the steel guide wall 3 on top of the cement-soil wall 1;

[0036] Step 3: Alternately hoist the combined steel core material 2A and combined steel core material 2B inside the steel guide wall 3 until the entire enclosure wall is completed;

[0037] Step 4: Remove steel guide wall 3, excavate the foundation pit and rebuild the basement structure;

[0038] Step 5: Install the lifting steel bracket 4 on the side of the combined steel core material 2A and combined steel core material 2B;

[0039] Step 6: Drill vertical holes inside the cement-soil wall 1 on the outside of the combined steel core material 2A and combined steel core material 2B, and perform high-pressure water flushing inside the holes;

[0040] Step 7: Use the pulling device to sequentially recover the combined steel core material 2A and the combined steel core material 2B.

[0041] Step 8: Grout the gaps left by the cement-soil wall 1 after extraction;

[0042] Step 9: Inspect the recovered combined steel core material 2A and combined steel core material 2B, and then apply them to the next foundation pit project.

[0043] Example 3: The construction process includes the following steps:

[0044] Position the edge of the foundation pit, and construct a cement-soil wall 1 along the edge of the foundation pit. Add a retarder to the cement-soil to extend the curing time of the cement-soil, which will facilitate the hoisting and installation of the combined steel core material 2.

[0045] After the cement-soil wall 1 is completed, a positioning guide wall is constructed on top of the cement-soil wall 1. The positioning guide wall consists of two "inverted L" shaped steel box plates. The net distance between the two "inverted L" shaped steel box plates is 10mm to 20mm greater than the width of the composite steel core material 2A.

[0046] Assemble the combined steel core material 2A and combined steel core material 2B, and apply a lubricant and friction reducer to their outer surfaces.

[0047] Install the combined steel core material 2B and combined steel core material 2A in sequence until the entire enclosure wall is completed.

[0048] After removing the steel guide wall 3, proceed with the foundation pit excavation and basement structure construction.

[0049] After the basement structure is completed, vertical holes are drilled in the cement-soil wall 1 along the inner and outer sides of the composite steel profile on the ground. The cement-soil reinforcement is broken up, and high-pressure water is used to flush the cement-soil in the holes to reduce the frictional resistance between the cement-soil wall 1 and the composite steel core material 2A and composite steel core material 2B.

[0050] 4. The steel bracket was lifted and installed on the ground.

[0051] Using jacks, lift up either the combined steel core material 2A or 2B. Once the lifting height exceeds 0.5m, use a crane to lift and retrieve either the combined steel core material 2A or 2B. Then, grout the gaps in the cement-soil wall 1 after removal.

[0052] Repeat the above process until all composite steel core materials 2A and 2B are recycled.

[0053] The recovered combined steel core materials 2A and 2B are inspected and then used in the next foundation pit project.

[0054] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for implementing a recyclable foundation pit retaining wall, wherein the foundation pit retaining wall comprises a cement-soil wall (1), a composite steel core material A, a composite steel core material B, a lifting steel bracket (4), and a steel guide wall (3), characterized in that: The interior of the cement-soil wall (1) is alternately provided with composite steel core materials. The composite steel core materials are divided into two types: composite steel core material A and composite steel core material B. The two ends of the composite steel core material A extend into the flange of the H-beam (21) at the end of the composite steel core material B. The top of the composite steel core material A and the composite steel core material B are provided with a lifting steel bracket (4). The top of the cement-soil wall (1) is provided with a steel guide wall (3). The combined steel core material A includes an H-beam (21), a channel steel (22), a cross brace (23), a convex joint (25), a bottom sealing plate (27), and a rubber grout stop (26). The H-beam (21) is located in the middle of the cross brace (23), and the channel steel (22) is located at both ends of the cross brace (23). The flanges of the H-beam (21) and the channel steel (22) are connected to the cross brace (23). The convex joint (25) is welded to the web of the channel steel (22). The bottom sealing plate (27) is located at the bottom of the combined steel core material A. The rubber grout stop (26) is located in the gap between the flanges of the H-beam (21) and the channel steel (22). The rubber grout stop (26) and the cross brace (23) are connected by bolts (24). A method for implementing a recyclable and reusable foundation pit retaining wall includes the following steps: Step 1: Construct a cement-soil wall (1) along the edge of the foundation pit, and add a retarder to the cement-soil wall (1); Step 2: Install the steel guide wall (3) on top of the cement-soil wall (1); Step 3: Alternately hoist the combined steel core material A and combined steel core material B inside the steel guide wall (3) until the entire enclosure wall is completed; Step 4: Remove the steel guide wall (3), excavate the foundation pit and rebuild the basement structure; Step 5: Install lifting steel brackets (4) on the sides of the combined steel core material A and the combined steel core material B; Step 6: Drill vertical holes in the cement-soil wall (1) on the outside of the combined steel core material A and the combined steel core material B, and perform high-pressure water flushing in the holes; Step 7: Use the pulling device to sequentially recover the combined steel core material A and the combined steel core material B; Step 8: Grout the gaps left by the cement-soil wall (1) after it is pulled out; Step 9: Inspect the recovered combined steel core material A and combined steel core material B, and then apply them to the next foundation pit project.

2. The method for implementing a recyclable foundation pit retaining wall according to claim 1, characterized in that, The composite steel core material B includes an H-beam (21), a cross brace (23), a bottom sealing plate (27), and a rubber grout stop strip (26). The flanges of the H-beam (21) are connected to the cross brace (23). The bottom sealing plate (27) is located at the bottom of the composite steel core material B. The rubber grout stop strip (26) is placed in the gap between the flanges of the H-beam (21).

3. The method for implementing a recyclable foundation pit retaining wall according to claim 1, characterized in that, The steel guide wall (3) includes two inverted L-shaped steel box panels.

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