Construction method of recyclable magnetic steel panel retaining wall

Abstract

The present invention belongs to the technical field of retaining wall construction, and specifically relates to a method for constructing a retaining wall with a recyclable magnetic steel panel. The method comprises the following steps: 1. installing embedded connectors; 2. installing and fixing steel beams; 3. installing electromagnets on the top of steel beams; 4. making and fixing steel panels; 5. backfilling and compacting indoor backfill soil in layers; 6. removing and recovering electromagnets; 7. indoor ground construction; 8. backfilling and compacting outdoor backfill soil in sections and recovering steel beams; 9. recovering steel panels; 10. filling with sand. The present invention solves the problem of long construction period of backfill retaining walls. At the same time, the components can continue to be used after being recovered, which reduces construction costs. The construction method is easy to operate, safe and reliable, saves materials, and meets construction requirements.

Description

Technical Field

[0001] The invention belongs to the technical field of retaining wall construction, and in particular relates to a construction method of a retaining wall with recyclable magnetic steel panels. Background Art

[0002] When construction projects are extremely tight and rushing to meet deadlines, the construction of independent foundation pits often involves large, localized excavation. Backfill is performed immediately after the underground structure is completed, and the ground cushion layer is constructed in advance. Upper formwork is then installed to support the construction of the upper structure. However, during backfilling, the outdoor area is often adjacent to temporary construction roads, and the backfill workload is enormous. To save time, a retaining wall is built around the building, with the indoor backfill and upper cushion layer constructed first, relocating the outdoor backfill to a non-critical path. However, the retaining wall is currently on a critical path, and its flow rate is directly impacting the overall construction progress.

[0003] Common retaining wall structures currently used include cast-in-place concrete retaining walls and gangue solid brick retaining walls. When using cast-in-place concrete retaining walls, it is necessary to install a strip foundation between two adjacent independent foundations. The retaining wall reinforcement is then tied to the strip foundation simultaneously with the original frame columns. The wall formwork is then installed, concrete is poured, and the wall formwork is removed. The construction process of cast-in-place concrete retaining walls is complicated, with high costs for labor, materials, and machinery, which is uneconomical. The construction period is long, affecting the overall construction period. When using gangue solid brick retaining walls, to ensure the integrity of the wall, full-length tie bars are installed along the height of the frame columns, and ring beams are installed at the top and middle of the wall. To resist the earth pressure of the backfill soil, supporting columns are also required on the back of the wall. The process is complicated, costly, uneconomical, and the construction period is long, affecting the overall construction period.

[0004] Chinese patent CN106759469A discloses a removable cantilever retaining wall and its construction and recovery methods. The retaining wall consists of a retaining wall base, retaining wall columns, and wedge-shaped steel plates. The retaining wall columns are bolted to the retaining wall base. The retaining wall columns are equipped with slots on both sides, into which the ends of the wedge-shaped steel plates snap. Multiple wedge-shaped steel plates are stacked vertically to form a retaining wall. This patent is primarily intended for use as a retaining structure for temporary soil accumulation during construction pit excavation and cannot be used during pit backfilling operations.

[0005] In summary, the existing retaining wall construction method has the defects of high cost, uneconomical and long construction period. When encountering the foundation pit backfilling operation that is in a hurry to meet the construction deadline, it will affect the total construction period and increase the construction cost. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a construction method for a recyclable magnetic steel panel retaining wall, which solves the problem of long construction period of backfill retaining wall. At the same time, the components can be continued to be used after recycling, reducing construction costs. The construction method is simple to operate, safe and reliable, saves materials, and meets construction requirements.

[0007] The method for constructing a retaining wall with recyclable magnetic steel panels according to the present invention comprises the following steps:

[0008] Step 1: Install embedded connectors:

[0009] Tie the frame column reinforcement on top of the independent foundation. After the frame column reinforcement is tied, locate the embedded connectors. The vertical spacing of the embedded connectors on a single frame column is 300-500mm. Determine the specific position of the embedded connectors, then tie and secure the embedded connectors to the frame column reinforcement. Then, build the frame column formwork and pour concrete.

[0010] Step 2: Install and fix the steel beam:

[0011] After the frame columns meet the conditions for demoulding, remove the frame column formwork and install the steel beams. The two ends of each steel beam are connected and fixed to the embedded connectors on the frame columns on both sides by connecting bolts;

[0012] Step 3: Install the electromagnet on the top of the steel beam:

[0013] (1) After the steel beams are installed, several electromagnets are evenly installed on the top and bottom steel beams, with the horizontal spacing between adjacent electromagnets being 750-1000mm, and several electromagnets are installed every other steel beam vertically;

[0014] (2) The electromagnet is fixedly connected to the steel beam by fixing bolts, and a power switch is provided at the mid-span position of the steel beam to match the electromagnet;

[0015] Step 4: Make and fix the steel panel:

[0016] (1) Determine the size of the steel panel and cut it into shape. The width of the steel panel is the net distance between two adjacent frame columns minus 50mm. The height of the steel panel is the distance from the top elevation of the higher independent foundation of the two adjacent independent foundations to the top elevation of the ground cushion. The thickness of the steel panel is 20~30mm.

[0017] (2) Two steel lifting rings are symmetrically set at 500~1000mm inward from both ends of the top of the steel panel. The two steel lifting rings are made of round steel with a diameter of 20~25mm;

[0018] (3) Use lifting equipment to lift the steel panel to the side of the steel beam facing the interior, and adjust the position of the steel panel so that it is in close contact with the steel beam;

[0019] (4) After the position of the steel panel is adjusted, the electromagnet is energized to adsorb the steel panel onto the steel beam;

[0020] Step 5: Backfill and compact the indoor backfill soil in layers:

[0021] Backfill the interior soil in layers, with each layer being 200-300mm thick. Each layer is mechanically compacted and tested for compaction. Once the compaction coefficient of the interior soil is greater than or equal to 0.94, the next layer can be backfilled. This process is repeated until the design elevation is reached.

[0022] Step 6: Remove the recovery electromagnet:

[0023] After the indoor backfill soil is backfilled to the designed elevation, turn off all power switches and remove all electromagnets;

[0024] Step 7: Indoor floor construction:

[0025] Lay a ground cushion on top of the indoor backfill soil, and set a moisture-proof layer on top of the ground cushion;

[0026] Step 8: Backfill and compact the outdoor backfill soil in sections and recover the steel beams:

[0027] (1) Backfill the lower outdoor backfill soil in layers, perform mechanical tamping on each backfill layer, and conduct a compaction test. After the compaction coefficient of the outdoor backfill soil is greater than or equal to 0.94, proceed to the next layer of backfill until the backfill reaches the designed elevation of the lower outdoor backfill soil, and remove the bottom steel beam;

[0028] (2) Backfill the upper outdoor backfill soil in layers, and perform mechanical tamping on each backfill layer and conduct a compaction test. After the compaction coefficient of the outdoor backfill soil is greater than or equal to 0.94, proceed to the next layer of backfill. Remove one steel beam after each two layers of outdoor backfill soil; and repeat this process until the backfill reaches the designed elevation;

[0029] Step 9: Recycling Steel Panels

[0030] After the outdoor backfill soil is backfilled to the designed elevation and all the steel beams are removed, the steel panels are hoisted out and recycled by lifting the steel rings with steel wire ropes.

[0031] Step 10: Sand filling:

[0032] After the steel panels are hoisted out, the gaps at the original positions of the steel panels are filled with sand in layers.

[0033] in:

[0034] The embedded connecting parts include anchor bars, embedded plates and connecting plates. The diameter of the anchor bars is greater than or equal to 12 mm, the length of the anchor bars is greater than or equal to 15 times the diameter of the anchor bars, the size of the embedded plates is 150×150 mm, and two bolt holes are provided on the connecting plates to match the connecting bolts.

[0035] The elevation of the bottom embedded connector is 300mm above the top elevation of the higher independent foundation among the two adjacent independent foundations; the elevation of the top embedded connector is 150mm below the top elevation of the ground cushion layer, and the number of embedded connectors on a single side frame column is an odd number.

[0036] The steel beam is installed with its opening facing downward.

[0037] The electromagnet is a rectangular DC electromagnet with a suction force of not less than 250 kg. The number of electromagnets on the top and bottom steel beams is not less than 3 respectively.

[0038] The power switch is connected to a DC power supply, and the DC power supply voltage is 12V.

[0039] The net distance between two adjacent frame columns ranges from 2000 to 5000 mm, and the distance from the top elevation of the independent foundation to the top elevation of the ground cushion layer ranges from 1500 to 2500 mm.

[0040] The elevation of the lower outdoor backfill soil is 100~150mm below the bottom elevation of the bottom steel beam; when the upper outdoor backfill soil is backfilled, the backfill thickness of each layer of outdoor backfill soil is evenly distributed according to the vertical spacing of adjacent steel beams, and the backfill thickness of each layer of outdoor backfill soil ranges from 200~300mm.

[0041] The thickness of the layered sand filling is 500-1000 mm. After each layer of sand filling is completed, L-shaped steel bars with a diameter of 20 mm are used for tamping. After the tamping is dense, the next layer of sand filling is carried out.

[0042] The sand filling method uses medium sand with a particle size of 0.25-0.5 mm.

[0043] Compared with the prior art, the present invention has the following beneficial effects:

[0044] (1) Steel panels and steel beams are quickly assembled into retaining walls, and after construction is completed, the steel panels and steel beams can be recycled and reused, effectively solving the problems of long construction period and high construction cost of traditional cast-in-place concrete retaining walls and brick masonry retaining walls;

[0045] (2) Electromagnets are installed on the steel beams to fix the steel panels by magnetic attraction. This makes the construction convenient and facilitates the recycling and reuse of the steel panels in the future.

[0046] (3) The electromagnet and the steel beam are connected with fixed bolts, which is easy to install and disassemble and is conducive to later recovery;

[0047] (4) The steel beams and embedded connectors are connected by connecting bolts, which are easy and quick to install and dismantle, effectively solving the problems of long construction period and unstable welding quality of traditional welding connections;

[0048] (5) Two steel lifting rings are symmetrically set on the top of the steel panel to facilitate recycling and lifting; the steel lifting rings are made of round steel, which is convenient for welding with the steel panel and improves the welding quality;

[0049] (6) The top elevation of the steel panel is consistent with the top elevation of the ground cushion layer. The steel panel can be used as a template for the ground cushion layer, which reduces the template material cost and labor cost, saves materials and is environmentally friendly.

[0050] The invention solves the problem of long construction period of backfill retaining wall, and the components can be reused after being recycled, thereby reducing construction cost. The construction method is simple to operate, safe and reliable, saves materials, and meets construction requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 is a top view of the present invention;

[0052] Figure 2 It is a front view of the present invention;

[0053] Figure 3 is a side view of the present invention;

[0054] Figure 4 yes Figure 1 A magnified view of part A in FIG;

[0055] Figure 5 yes Figure 2 A magnified view of part B in FIG;

[0056] Figure 6 yes Figure 3 Enlarged view of part C in FIG;

[0057] In the figure: 1. Frame column; 2. Embedded connector; 3. Steel beam; 4. Connecting bolts; 5. Fixing bolts; 6. Electromagnet; 7. Power switch; 8. Steel panel; 9. Steel lifting ring; 10. Independent foundation; 11. Indoor backfill; 12. Outdoor backfill; 13. Ground cushion. DETAILED DESCRIPTION

[0058] The present invention is described and illustrated in detail below with reference to the embodiments.

[0059] Example 1

[0060] like Figure 1-6 As shown, the specific steps of the construction method of the recyclable magnetic steel panel retaining wall described in this embodiment are as follows:

[0061] Step 1: Install embedded connector 2:

[0062] Tie the steel bars of the frame column 1 on the top of the independent foundation 10. After the steel bars of the frame column 1 are tied, position the embedded connectors 2. The vertical spacing of the embedded connectors 2 on a single frame column 1 is 300-500 mm. Determine the specific position of the embedded connectors 2, then tie and fix the embedded connectors 2 to the steel bars of the frame column 1, and then build the formwork of the frame column 1 and pour concrete.

[0063] Step 2: Install and fix the steel beam 3:

[0064] After the frame column 1 reaches the demoulding condition, remove the frame column 1 template and install the steel beam 3. Each end of the steel beam 3 is connected and fixed to the embedded connector 2 on the frame column 1 on both sides by connecting bolts 4;

[0065] Step 3: Install the electromagnet 6 on the top of the steel beam 3:

[0066] (1) After the steel beams 3 are installed, several electromagnets 6 are evenly arranged on the top and bottom steel beams 3, with the horizontal spacing between adjacent electromagnets 6 being 750-1000 mm, and several electromagnets 6 are arranged vertically for every steel beam 3;

[0067] (2) The electromagnet 6 is fixedly connected to the steel beam 3 by fixing bolts 5, and a power switch 7 is provided at the mid-span position of the steel beam 3 to match the electromagnet 6;

[0068] Step 4: Make and fix the steel panel 8:

[0069] (1) Determine the size of the steel panel 8 and cut it into shape. The width of the steel panel 8 is the net distance between two adjacent frame columns 1 minus 50 mm. The height of the steel panel 8 is the distance from the top elevation of the higher independent foundation 10 of the two adjacent independent foundations 10 to the top elevation of the ground cushion 13. The thickness of the steel panel 8 is 20-30 mm.

[0070] (2) Two steel lifting rings 9 are symmetrically arranged at a position 500-1000 mm inward from both ends of the top of the steel panel 8. The two steel lifting rings 9 are made of round steel with a diameter of 20-25 mm;

[0071] (3) Use lifting equipment to lift the steel panel 8 to the side of the steel beam 3 facing the interior, and adjust the position of the steel panel 8 so that the steel panel 8 is closely attached to the steel beam 3;

[0072] (4) After the position adjustment of the steel panel 8 is completed, the electromagnet 6 is energized to adsorb the steel panel 8 onto the steel beam 3 through the electromagnet 6;

[0073] Step 5: Backfill and compact the indoor backfill soil in layers 11:

[0074] Backfill the indoor backfill soil 11 in layers, with each layer having a thickness of 200-300 mm. Each backfill layer is mechanically compacted and tested for compaction. When the compaction coefficient of the indoor backfill soil 11 is greater than or equal to 0.94, the next layer of backfill is carried out. This process is repeated until the backfill reaches the designed elevation.

[0075] Step 6: Remove and recycle electromagnet 6:

[0076] After the indoor backfill soil 11 is backfilled to the design elevation, turn off all power switches 7 and remove all electromagnets 6;

[0077] Step 7: Indoor floor construction:

[0078] A ground cushion layer 13 is laid on top of the indoor backfill soil 11, and a moisture-proof layer is provided on top of the ground cushion layer 13;

[0079] Step 8: Backfill and compact the outdoor backfill soil 12 in sections and recover the steel beam 3:

[0080] (1) Backfill the lower outdoor backfill soil 12 in layers, perform mechanical tamping on each backfill layer, and conduct a compaction test. After the compaction coefficient of the outdoor backfill soil 12 is greater than or equal to 0.94, proceed to the next layer of backfill until the backfill reaches the designed elevation of the lower outdoor backfill soil 12, and remove the bottom steel beam 3;

[0081] (2) Backfill the upper outdoor backfill soil 12 in layers, perform mechanical tamping on each backfill layer, and conduct a compaction test. After the compaction coefficient of the outdoor backfill soil 12 is greater than or equal to 0.94, proceed to the next layer of backfill. Remove one steel beam 3 after each two layers of backfill soil 12. Repeat this process until the backfill reaches the design elevation.

[0082] Step 9: Recycling Steel Panel 8:

[0083] After the outdoor backfill soil 12 is backfilled to the design elevation and all the steel beams 3 are removed, the steel panel 8 is lifted out and recovered by lifting the steel eye 9 with a steel wire rope using a lifting device;

[0084] Step 10: Sand filling:

[0085] After the steel panel 8 is hoisted out, the gaps at the original positions of the steel panel 8 are filled with sand in layers.

[0086] The embedded connecting part 2 includes an anchor bar, an embedded plate and a connecting plate. The diameter of the anchor bar is greater than or equal to 12 mm, the length of the anchor bar is greater than or equal to 15 times the diameter of the anchor bar, the embedded plate size is 150×150 mm, and two bolt holes are provided on the connecting plate to match the connecting bolts 4.

[0087] The elevation of the bottom embedded connector 2 is 300 mm above the top elevation of the higher independent foundation 10 among the two adjacent independent foundations 10; the elevation of the top embedded connector 2 is 150 mm below the top elevation of the ground cushion 13, and the number of embedded connectors 2 on a single-side frame column 1 is an odd number.

[0088] The steel crossbeam 3 is installed with its opening facing downward.

[0089] The electromagnet 6 is a rectangular DC electromagnet, the suction value of the electromagnet 6 is not less than 250 kg, and the number of electromagnets 6 on the top and bottom steel beams 3 is not less than 3 respectively.

[0090] The power switch 7 is connected to a DC power supply, and the DC power supply voltage is 12V.

[0091] The net distance between two adjacent frame columns 1 ranges from 2000 to 5000 mm, and the distance from the top elevation of the independent foundation 10 to the top elevation of the ground cushion layer 13 ranges from 1500 to 2500 mm.

[0092] The elevation of the lower outdoor backfill soil 12 is 100~150mm downward from the bottom elevation of the bottom steel beam 3; when the upper outdoor backfill soil 12 is continued to be backfilled, the backfill thickness of each layer of outdoor backfill soil 12 is evenly distributed according to the vertical spacing of adjacent steel beams 3, and the backfill thickness range of each layer of outdoor backfill soil 12 is 200~300mm.

[0093] The thickness of the layered sand filling is 500~1000mm. After each layer of sand filling is completed, L-shaped steel bars with a diameter of 20mm are used for tamping. After the tamping is dense, the next layer of sand filling is carried out.

[0094] The sand used for filling is medium sand with a particle size of 0.25~0.5mm.

Claims

1. A method for constructing a recyclable magnetic steel panel retaining wall, characterized in that: The following steps are involved: Step 1: Install the embedded connector (2): The reinforcement of the frame column (1) is tied on the top of the independent foundation (10). After the reinforcement of the frame column (1) is tied, the embedded connector (2) is positioned. The vertical spacing of the embedded connector (2) on a single frame column (1) is 300 to 500 mm. The specific position of the embedded connector (2) is determined, and the embedded connector (2) is then tied and fixed to the reinforcement of the frame column (1). Then, the formwork of the frame column (1) is built and concrete is poured. Step 2: Install and fix the steel beam (3): After the frame column (1) reaches the demoulding condition, the frame column (1) formwork is removed, and the steel beam (3) is installed. The two ends of each steel beam (3) are respectively connected and fixed to the embedded connecting pieces (2) on the frame columns (1) on both sides by connecting bolts (4); Step 3: Install the electromagnet (6) on the top of the steel beam (3): (i) After the steel beam (3) is installed, a plurality of electromagnets (6) are evenly arranged on the top and bottom steel beams (3), respectively, with the horizontal spacing between adjacent electromagnets (6) being 750 to 1000 mm, and a plurality of electromagnets (6) are arranged vertically for every steel beam (3); (ii) the electromagnet (6) is fixedly connected to the steel beam (3) by means of fixing bolts (5), and a power switch (7) is provided at the mid-span position of the steel beam (3) in coordination with the electromagnet (6); Step 4: Make and fix the steel panel (8): (i) Determine the size of the steel panel (8) and cut it into shape, wherein the width of the steel panel (8) is the net distance between two adjacent frame columns (1) minus 50 mm, the height of the steel panel (8) is the distance from the top elevation of the higher independent foundation (10) of the two adjacent independent foundations (10) to the top elevation of the ground cushion layer (13), and the thickness of the steel panel (8) is 20 to 30 mm; (ii) two steel lifting rings (9) are symmetrically arranged at the positions 500 to 1000 mm inwards from the top ends of the steel panel (8), and the two steel lifting rings (9) are made of round steel with a diameter of 20 to 25 mm; (iii) using a lifting device to lift the steel panel (8) to the side of the steel beam (3) facing the interior, and adjusting the position of the steel panel (8) so that the steel panel (8) is closely attached to the steel beam (3); (iv) after the position adjustment of the steel panel (8) is completed, the electromagnet (6) is energized, and the steel panel (8) is adsorbed onto the steel beam (3) by the electromagnet (6); Step 5: Backfill and compact the indoor backfill soil in layers (11): Backfill the indoor backfill soil (11) in layers, with each layer having a thickness of 200 to 300 mm; perform mechanical compaction on each backfill layer, and perform a compaction test; after the compaction coefficient of the indoor backfill soil (11) is greater than or equal to 0.94, perform the next backfill layer; and so on until the backfill reaches the designed elevation; Step 6: Remove the recovery electromagnet (6): After the indoor backfill soil (11) is backfilled to the designed elevation, all power switches (7) are turned off and all electromagnets (6) are removed; Step 7: Indoor floor construction: A ground cushion layer (13) is laid on the upper part of the indoor backfill soil (11), and a moisture-proof layer is provided on the upper part of the ground cushion layer (13); Step 8: Partially backfill and compact the outdoor backfill soil (12) and recover the steel beam (3): (i) backfilling the lower outdoor backfill soil (12), backfilling the lower outdoor backfill soil (12) in layers, mechanically compacting each backfilled layer, and performing a compaction test, and after the compaction coefficient of the outdoor backfill soil (12) is greater than or equal to 0.94, backfilling the next layer, until the backfill reaches the designed elevation of the lower outdoor backfill soil (12), and removing the bottommost steel beam (3); (ii) backfilling the upper outdoor backfill soil (12), backfilling the upper outdoor backfill soil (12) in layers, mechanically compacting each backfilled layer, and conducting a compaction test, and after the compaction coefficient of the outdoor backfill soil (12) is greater than or equal to 0.94, backfilling the next layer, and removing one steel beam (3) after backfilling two layers of outdoor backfill soil (12); and so on until the backfill reaches the designed elevation; Step 9: Recycling Steel Panel (8): After the outdoor backfill soil (12) is backfilled to the designed elevation and all the steel beams (3) are removed, the steel panel (8) is lifted out and recovered by lifting the steel lifting ring (9) with a steel wire rope using a lifting device; Step 10: Sand filling: After the steel panel (8) is hoisted out, the gaps at the original position of the steel panel (8) are filled with sand in layers.

2. The method for constructing a recyclable magnetic steel panel retaining wall according to claim 1, characterized in that: The embedded connecting piece (2) comprises an anchor bar, an embedded plate and a connecting plate. The diameter of the anchor bar is greater than or equal to 12 mm, the length of the anchor bar is greater than or equal to 15 times the diameter of the anchor bar, the embedded plate has a size of 150×150 mm, and two bolt holes are provided on the connecting plate to match the connecting bolts (4).

3. The method for constructing a recyclable magnetic steel panel retaining wall according to claim 1, characterized in that: The elevation of the bottom embedded connector (2) is 300 mm above the top elevation of the higher independent foundation (10) of the two adjacent independent foundations (10); the elevation of the top embedded connector (2) is 150 mm below the top elevation of the ground cushion layer (13), and the number of embedded connectors (2) on a single-side frame column (1) is an odd number.

4. The method for constructing a recyclable magnetic steel panel retaining wall according to claim 1, characterized in that: The steel crossbeam (3) is installed with its opening facing downward.

5. The method for constructing a recyclable magnetic steel panel retaining wall according to claim 1, characterized in that: The electromagnet (6) is a rectangular DC electromagnet, the suction force of the electromagnet (6) is not less than 250 kg, and the number of the electromagnets (6) on the top and bottom steel beams (3) is not less than 3 respectively.

6. The method for constructing a recyclable magnetic steel panel retaining wall according to claim 1, characterized in that: The power switch (7) is connected to a DC power supply, and the DC power supply voltage is 12V.

7. The method for constructing a recyclable magnetic steel panel retaining wall according to claim 1, characterized in that: The clear distance between two adjacent frame columns (1) ranges from 2000 to 5000 mm, and the distance from the top elevation of the independent foundation (10) to the top elevation of the ground cushion layer (13) ranges from 1500 to 2500 mm.

8. The method for constructing a recyclable magnetic steel panel retaining wall according to claim 1, characterized in that: The elevation of the lower outdoor backfill soil (12) is 100 to 150 mm below the bottom elevation of the bottom steel beam (3); when the upper outdoor backfill soil (12) is backfilled, the backfill thickness of each layer of outdoor backfill soil (12) is evenly distributed according to the vertical spacing between adjacent steel beams (3), and the backfill thickness of each layer of outdoor backfill soil (12) ranges from 200 to 300 mm.

9. The method for constructing a recyclable magnetic steel panel retaining wall according to claim 1, characterized in that: The thickness of the layered sand filling is 500~1000mm. After each layer of sand filling is completed, L-shaped steel bars with a diameter of 20mm are used for tamping. After the tamping is dense, the next layer of sand filling is carried out.

10. The method for constructing a recyclable magnetic steel panel retaining wall according to claim 1, characterized in that: The sand used for filling is medium sand with a particle size of 0.25~0.5mm.

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