A reinforced soil retaining wall for recycled waste tires with a return wrapping structure and its construction method

Abstract

The present invention discloses a wrapped-back waste tire reinforced soil retaining wall and its construction method. The retaining wall includes waste tires, a wall bottom plate, geogrids, connecting pieces, self-locking nylon tie mesh, temporary baffles and backfill materials. The waste tires are laid horizontally and stacked vertically in a staggered manner. Reserved holes are provided on the bottom and top surfaces of the tires. Adjacent tires are connected by connecting pieces to form a tire wall. Tires are laid in the grooves on the surface of the wall bottom plate, and backfill materials are filled and compacted by rolling. The geogrids include reinforcing geogrids and wrapped-back geogrids. The construction method comprises the following steps: component preparation; earth excavation; foundation construction; laying of reinforcing geogrids; laying of wrapped-back geogrids and the first layer of upper waste tires; laying of the second layer of upper waste tires, and backfill materials are filled in the tires; laying of wrapped-back geogrids; arranging temporary baffles; filling backfill materials behind the wall; repeating until the design height is reached. The present invention can reduce the environmental pollution caused by waste tires and reduce the engineering cost.

Description

Technical Field

[0001] The present invention relates to the field of reinforcement, and particularly to a wrapped-back waste tire reinforced soil retaining wall and a construction method thereof. Background Art

[0002] In recent years, China has ranked first in the world in the annual production of waste tires for many years, and the annual production of waste tires has increased sharply. Long-term open stacking of waste tires not only occupies a large amount of land resources, but also is extremely likely to breed mosquitoes and spread diseases, deteriorate the natural environment, and may cause fires, threatening people's lives and property safety. How to "turn waste into treasure" is the biggest challenge we face.

[0003] At present, the main way to recycle waste tires in China is to use waste tires as fuel, but the resource utilization rate is not high, and secondary pollution will be caused if there is a slight carelessness during the operation process. The main way to utilize waste tires in engineering is to incorporate tire particles or cut tire strips into the soil to improve the mechanical properties of the soil. However, volatile pollutants will be generated during the process of grinding tires into particles, and the process of cutting waste tires into strips will also increase the engineering cost. Chinese Patent with the application number 201811078560.3 discloses a retaining wall and a construction method thereof, in which tires are stacked staggeredly and connected by steel wires to form a tire wall. This structure is simple and easy to construct. However, the tires are only connected by steel wire binding, resulting in extremely low stiffness and integrity of the tire wall. Moreover, this structure has no foundation, and the tire wall does not have anti-overturning performance. Summary of the Invention

[0004] Object of the Invention: In order to overcome the deficiencies in the prior art, the object of the present invention is to provide a wrapped-back waste tire reinforced soil retaining wall with high stiffness and good stability for the tire retaining wall, and another object of the present invention is to provide a simple and easy construction method for the wrapped-back waste tire reinforced soil retaining wall.

[0005] Technical Solution: A wrapped-back geogrid reinforced soil retaining wall according to the present invention includes waste tires, a wall bottom plate, geogrids, connecting pieces, self-locking nylon tie net sheets, temporary baffles and backfill materials; the waste tires are laid horizontally and stacked vertically in a staggered manner, and reserved holes are provided on the bottom and top surfaces of the waste tires. Adjacent waste tires are connected by connecting pieces to form a tire wall; grooves are provided on the surface of the wall bottom plate, and waste tires are laid in the grooves, filled with backfill materials and compacted; the geogrids include reinforcing geogrids and wrapped-back geogrids; the geogrids are laid horizontally in the backfill materials and wrapped back around the waste tires, and the reinforcing geogrids and the wrapped-back geogrids are connected by self-locking nylon tie net sheets; the connecting pieces are used to connect adjacent waste tires and geogrids; the temporary baffles play a role in temporarily fixing the retaining wall when laying waste tires and filling backfill materials, and the backfill materials are backfilled layer by layer inside the waste tires and behind the tire wall and compacted.

[0006] To ensure that the waste tire retaining wall has sufficient stiffness, strength and stability, the radius of the waste tire is not less than 320 mm, the cross-sectional width is not less than 215 mm, the number of reserved holes at the bottom and top surfaces of the waste tire is 8 each, and the diameter of the reserved holes is 4 mm - 6 mm.

[0007] The wall base plate is a precast component. To improve the anti-overturning performance of the waste tire retaining wall and facilitate construction, the cross-sectional width of the groove of the wall base plate is 20 - 40 mm larger than the diameter of the waste tire, and the height h = 2t + 150 mm, where t is the cross-sectional width of the waste tire. The geogrid is a high-density polyethylene biaxial geogrid added with 2% anti-corrosive carbon black with a particle size of 15 nm - 25 nm.

[0008] The connecting piece includes a main connecting piece, screws, nuts and washers, all made of cold heading steel. There are 8 screw holes provided on the main connecting piece, evenly distributed on the upper flange and the lower flange. The screws are self-piercing self-tapping screws, with a nominal radius of 4 mm - 6 mm and a length of 500 mm - 700 mm. The performance grade of the nuts is 4.8 - 5.6, and the performance grade of the screws is 3.6 - 4.6.

[0009] The length of the self-locking nylon tie wire mesh is 800 mm - 1000 mm, and the width is 500 mm - 800 mm more than the width of the geogrid. The self-locking nylon tie wire mesh is made of PA66, and its unit grid includes nylon ties and cross-shaped ribs. The nylon ties are located at the nodes of the cross-shaped ribs. The width of the nylon ties is 2 mm - 3 mm, and the length is 8 mm - 12 mm. The side length of the unit grid of the self-locking nylon tie wire mesh is 4 - 5 times that of the unit grid of the geogrid.

[0010] The temporary baffle is a steel plate or a wooden board, which is close to the front end of the retaining wall and plays a role of temporary support.

[0011] The construction method of the above-mentioned retaining wall includes the following steps:

[0012] a. Component preparation: Precast the wall base plate according to the specifications of the used waste tires, reserve holes on the bottom and top surfaces of the waste tires, and cut the geogrid and the self-locking nylon tie wire mesh according to the design;

[0013] b. Earth excavation: Carry out earth excavation according to the design drawings;

[0014] c. Foundation construction: Hoist and place the wall bottom slab to the designed elevation. After laying the first layer of waste tires in the groove of the wall bottom slab, connect the bottoms of the first-layer waste tires with connecting pieces. Then fill the groove with backfill material and vibrate and compact it until it is backfilled to a position 30 mm - 50 mm away from the top surface of the first-layer waste tires. Next, lay the second-layer waste tires of the foundation. The second-layer waste tires of the foundation and the first-layer waste tires of the foundation are arranged vertically and staggeredly. Install connecting pieces at the connection between the bottom surface of the second-layer waste tires of the foundation and the top surface of the first-layer waste tires of the foundation to connect the first-layer waste tires of the foundation and the second-layer waste tires of the foundation into one body. Then fill the groove with backfill material and vibrate and compact it until it is backfilled to a position 30 mm - 50 mm away from the top surface of the second-layer waste tires of the foundation. Reserve connecting pieces on the top surface of the second-layer waste tires of the foundation. Then continue to fill the backfill material to the designed elevation of the ground floor;

[0015] d. Laying the geogrid: Level the geogrid before laying it and reserve the laying length for the wrapped-back geogrid. The width of the geogrid is 5D - 8D, where D is the diameter of the waste tire. First, lay the reinforced geogrid. When laying, the reinforced geogrid is perpendicular to the wall height, and its laying length behind the wall is 0.7H - 1.2H, where H is the wall height;

[0016] e. Laying the wrapped-back geogrid and the first-layer waste tires on the upper part: The reserved length of the wrapped-back geogrid is 4D + 4t + 500 mm, where D and t are the diameter and cross-sectional width of the waste tire respectively. Lay the first-layer waste tires on the upper part on the reserved wrapped-back geogrid. The first-layer waste tires on the upper part and the second-layer waste tires of the foundation are arranged vertically and staggeredly. Connect the second-layer waste tires of the foundation, the wrapped-back geogrid, and the first-layer waste tires on the upper part with the reserved connecting pieces;

[0017] f. Laying the second-layer waste tires on the upper part and backfilling the waste tires with backfill material: Fill the first-layer waste tires on the upper part with backfill material until it is backfilled to a position 30 mm - 50 mm away from the top surface of the first-layer waste tires on the upper part. Then lay the second-layer waste tires on the upper part. The second-layer waste tires on the upper part and the first-layer waste tires on the upper part are arranged vertically and staggeredly. Install connecting pieces at the connection between the bottom surface of the second-layer waste tires on the upper part and the top surface of the first-layer waste tires on the upper part to connect the first-layer waste tires on the upper part and the second-layer waste tires on the upper part into one body. Then fill the second-layer waste tires on the upper part with backfill material until it is backfilled to a position 30 mm - 50 mm away from the top surface of the second-layer waste tires on the upper part. Reserve connecting pieces on the top surface of the second-layer waste tires on the upper part. Then continue to fill the backfill material to the top surface of the second-layer waste tires on the upper part;

[0018] g. Laying and wrapping the geogrid: Wrap the first layer of waste tires on the upper part and the periphery of the second layer of waste tires on the upper part with the wrapping geogrid. At the elevation of the bottom surface of the first layer of waste tires on the upper part, the wrapping geogrid is laid horizontally and bonded to the reinforcing geogrid. Connect the wrapping geogrid and the reinforcing geogrid with a self-locking nylon tie mesh. Then, apply a tensile force to the end of the reinforcing geogrid. After the reinforcing geogrid is tightened, fix the end of the reinforcing geogrid in the soil with pins, and connect the adjacent geogrids in the horizontal direction with a self-locking nylon tie mesh;

[0019] h. Arranging temporary baffles: Arrange the temporary baffles at the front end of the retaining wall to make them close to the tire wall to prevent large displacements of the tire wall when backfill is filled behind the tire wall;

[0020] i. Filling backfill behind the wall: Fill backfill behind the wall up to the top surface of the second layer of waste tires on the upper part, and vibrate and compact it;

[0021] j. Repeat the above steps (d) to (i) until the wall reaches the designed height.

[0022] Working principle: The waste tires are firmly connected together by connecting pieces with high strength and corrosion resistance, and the waste tires are wrapped by the geogrid. Due to the friction between the reinforcement and the soil, the tire wall is subjected to tension, so the pressure on the tire wall can be offset, and thus the horizontal deformation of the tire wall can be reduced; the tread of the waste tire has a strong lateral restraint effect on the soil, and the side surface of the tire also has a certain restraint effect on the soil. The frictional force between the side surfaces of the tires weakens the horizontal deformation caused by the lateral earth pressure; this structural form can significantly improve the integrity and stiffness of the retaining wall. The retaining wall can withstand large shear forces and bending moments and has good seismic performance.

[0023] Beneficial effects: Compared with the prior art, the present invention has the following remarkable features:

[0024] 1. Using waste tires as the retaining wall can not only solve the problem of the accumulation of a large number of waste tires, reduce the environmental pollution caused by waste tires, but also greatly reduce the engineering cost;

[0025] 2. The waste tires are wrapped by the geogrid, and the wrapping geogrid and the reinforcing geogrid are connected by a self-locking nylon tie mesh, which can significantly improve the stiffness and stability of the tire retaining wall;

[0026] 3. The components such as the wall bottom slab used are precast components or components that can be processed in advance. The construction is simple and easy, which not only improves the construction efficiency, but also occupies less land, and the construction has less impact on the environment;

[0027] 4. The waste tires and the geogrid are light in weight and low in price, and have good physical and mechanical properties, and are good engineering building materials;

[0028] 5. The adjacent tires are firmly connected together by connecting pieces, which not only greatly improves the stiffness and stability of the tire retaining wall, but also makes the construction simple and easy.

[0029] 6. Setting the wall bottom plate can significantly improve the anti-overturning force of the tire wall, reduce the foundation settlement, and improve the stability of the retaining wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a perspective view of the present invention;

[0031] Figure 2 is a schematic structural view of the geogrid 3 wrapping the waste tire 1 of the present invention;

[0032] Figure 3 is a schematic structural view of the waste tire 1 of the present invention;

[0033] Figure 4 is a schematic structural view of the wall bottom plate 2 of the present invention;

[0034] Figure 5 is a schematic structural view of the connecting piece 4 of the present invention;

[0035] Figure 6 is a schematic structural view of the self-tapping screw 402 of the present invention

[0036] Figure 7 is a schematic view of the connection of the waste tires 1 on the same layer of the present invention;

[0037] Figure 8 is a schematic view of the connection of the waste tires 1 on different layers of the present invention;

[0038] Figure 9 is a schematic view of the connection of the adjacent waste tires 1 in the same layer of the geogrid wrapping layer of the present invention;

[0039] Figure 10 is a schematic view of the connection of the reinforced geogrid 301 and the wrapping geogrid 302 of the present invention;

[0040] Figure 11 is a schematic structural view of the self-locking nylon tie net 5 of the present invention;

[0041] Figure 12 is a schematic structural view of the unit grid of the self-locking nylon tie net 5 of the present invention;

[0042] Figure 13 is a schematic structural view of the support of the temporary baffle 6 of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0043] The directions shown in the accompanying drawings of the specification are defined as up, down, left, and right.

[0044] As shown in Figure 1-2 , the waste tires 1 are laid horizontally and stacked vertically in a staggered manner. The adjacent waste tires 1 are connected by connecting pieces 4 to form a tire wall. Two layers of waste tires 1 are laid in the groove 204 of the wall bottom plate 2, and the backfill 7 is filled and compacted by rolling. The geogrid 3 is laid horizontally in the backfill 7 and wraps the waste tires 1. The reinforced geogrid 301 and the wrapped geogrid 302 are connected by a self-locking nylon tie mesh 5. The backfill 7 is backfilled in layers inside the waste tires and behind the tire wall and compacted by rolling. Every two layers of waste tires 1 are wrapped with one layer of the wrapped geogrid 302. The reinforced geogrid 301 and the wrapped geogrid 302 are an integral geogrid 3.

[0045] The width of the geogrid 3 is 5D - 8D, where D is the diameter of the waste tire 1. The laying length of the reinforced geogrid (3-1) behind the wall is 0.7H - 1.2H, where H is the wall height. The geogrid 3 is a high-density polyethylene biaxial geogrid added with 2% anti-corrosive carbon black with a particle size of 15nm - 25nm. The material used for the self-locking nylon tie mesh 5 is new PA66, and the self-locking nylon tie mesh 5 is composed of unit meshes. The unit mesh is composed of a nylon tie 501 and a cross-shaped rib 502. For the convenience of construction, the length of the self-locking nylon tie mesh 5 is 800mm - 1000mm, its width is 500mm - 800mm more than the width of the geogrid 3, the side length of its unit mesh is 4 - 5 times that of the unit mesh of the geogrid 3. In the unit mesh, the nylon tie 501 is located at the node of the cross-shaped rib 502, the width of the nylon tie 501 is 2mm - 3mm, and the length is 8mm - 12mm.

[0046] As shown in Figure 3 , eight reserved holes 8 are provided on the top and bottom surfaces of the waste tire 1 for connection with the connecting piece 4. The radius of the waste tire 1 is not less than 320mm, and the section width is not less than 215mm.

[0047] As shown in Figure 4 , in order to improve the anti-overturning performance of the waste tire retaining wall and facilitate construction, the wall bottom plate 2 includes a wall heel 201, a wall toe 202, a tenon 203 and a groove 204. The width of the wall bottom plate 2 is 3D - 5D. The length of the wall heel 201 is determined by checking the anti-slip stability of the wall body, and the thickness is 1 / 18H - 1 / 16H. The length of the wall toe 202 is 1 / 9H - 1 / 6H, and the thickness is 1 / 18H - 1 / 16H. The section width of the tenon 203 is 20mm larger than the diameter of the waste tire 1, and the height is determined by checking the anti-slip stability of the wall body. The section width of the groove 204 is 20 - 40mm larger than the diameter of the waste tire 1, and the height h of the groove 204 = 2t + 150mm (t is the section width of the waste tire).

[0048] As Figure 5 , four reserved holes 8 are also provided on the surface of the connecting piece 4, and the diameters are all 4 mm to 6 mm.

[0049] As Figure 6 , the connecting piece 4 is composed of a main connecting piece 401, a screw 402, a nut 403 and a washer 404, and is used to connect adjacent waste tires 1 and geogrids 3. The material used is cold heading steel. The screw 402 is a self-extruding and self-tapping screw, with a nominal diameter of 4 mm to 6 mm and a length of 500 mm to 700 mm. The performance grade of the nut 403 is one level higher than that of the screw 402.

[0050] As Figures 7-13 , the construction method of the retaining wall specifically includes the following steps:

[0051] Step 1, component preparation: Prefabricate the wall bottom plate 2, set reserved holes 8 on the top and bottom surfaces of the waste tire 1, cut the geogrid 3 and the self-locking nylon tie net sheet 5 according to the design, and stack the materials separately at the construction site. The geogrid 3 and the self-locking nylon tie net sheet 5 should be protected from direct sunlight;

[0052] Step 2, earth excavation: Carry out earth excavation according to the design drawings. If the foundation is a soft soil layer, materials such as gravel and crushed stone should be used for replacement filling to make the bearing capacity of the foundation reach the design requirements;

[0053] Step 3, foundation construction: Lift and place the wall bottom plate 2 to the design elevation. Lay the first layer of waste tire (1) in the groove 204 of the wall bottom plate 2. The bottom surface of the first layer of waste tire 1 is connected by the connecting piece 4, and then backfill material 7 is filled in the groove 204 and vibrated and compacted. Backfill to a position 30 mm to 50 mm from the top surface of the first layer of waste tire 1. Then lay the second layer of waste tire 1. The second layer of waste tire 1 and the first layer of waste tire 1 are arranged vertically and staggered. Install the connecting piece 4 at the connection between the top surface of the first layer of waste tire 1 and the bottom surface of the second layer of waste tire 1 to connect the first layer of waste tire 1 and the second layer of waste tire 1 into one body. Then fill backfill material 7 in the groove 204 and vibrate and compact it. Backfill to a position 30 mm to 50 mm from the top surface of the second layer of waste tire 1. Reserve the connecting piece 4 on the top surface of the second layer of waste tire 1, and then fill backfill material 7 to the design elevation of the ground floor;

[0054] Step 4, laying the reinforced geogrid 301: Before laying the geogrid 3, level the paving first and reserve the length for the return-wrapped geogrid 302. First, lay the reinforced geogrid 301, which is perpendicular to the wall height. The cutting length of the reinforced geogrid 301 is truncated based on the design length plus a surplus of 1000 mm to 2000 mm. The overlapping length shall not be less than 500 mm, and the geogrid 3 at the overlapping part is firmly connected with a self-locking nylon tie net 5.

[0055] Step 5, laying the return-wrapped geogrid 302 and the first layer of upper waste tires 1: The reserved length of the return-wrapped geogrid 302 is 4D + 4t + 500 mm, where D and t are the diameter and cross-sectional width of the waste tire 1 respectively. Lay the first layer of upper waste tires 1 on the reserved return-wrapped geogrid 302. The first layer of upper waste tires 1 and the second layer of foundation waste tires 1 are arranged vertically and staggeredly, and connect the second layer of foundation waste tires 1 and the return-wrapped geogrid 302 with the reserved connecting piece 4;

[0056] Step 6, laying the second layer of upper waste tires 1 and filling the backfill material 7 in the waste tires 1: Fill the backfill material 7 in the first layer of upper waste tires 1 until it is 30 mm to 50 mm away from the top surface of the first layer of upper waste tires 1. Then lay the second layer of upper waste tires 1. The second layer of upper waste tires 1 and the first layer of upper waste tires 1 are arranged vertically and staggeredly. Install the connecting piece 4 at the connection between the top surface of the first layer of upper waste tires 1 and the bottom surface of the second layer of upper waste tires 1 to connect the first layer of upper waste tires 1 and the second layer of upper waste tires 1 into one body. Then fill the backfill material 7 in the second layer of upper waste tires 1 until it is 30 mm to 50 mm away from the top surface of the second layer of upper waste tires 1. Reserve the connecting piece 4 at the top surface of the second layer of upper waste tires 1, and then fill the backfill material 7 to the top surface of the second layer of upper waste tires 1;

[0057] Step 7, laying the return-wrapped geogrid 302: Wrap the first layer of upper waste tires 1 and the second layer of upper waste tires 1 around with the return-wrapped geogrid 302. At the elevation of the bottom surface of the first layer of upper waste tires 1, the return-wrapped geogrid 302 is laid horizontally and fits together with the reinforced geogrid 301. Connect the reinforced geogrid 301 and the return-wrapped geogrid 302 with a self-locking nylon tie net 5. Apply a tensile force to the end of the reinforced geogrid 301. After the reinforced geogrid 301 is tightened, fix the end of the reinforced geogrid 301 in the soil with a pin, and connect the horizontally adjacent geogrids 3 with a self-locking nylon tie net 5;

[0058] Step 8, arranging the temporary baffle 6: To prevent the tire retaining wall from tilting during construction, arrange the temporary baffle 6 at the front end of the retaining wall to make it close to the tire retaining wall. The temporary baffle 6 can be removed after the tire retaining wall construction is completed;

[0059] Step 9, backfill material 7 behind the infilled wall: Backfill behind the wall with backfill material 7 up to the top surface of the second layer of waste tires 1 in the upper part. Backfill in layers according to the principle of "first on both sides, then in the middle", and vibrate and compact it densely.

[0060] Step 10, repeat the above steps 4 to 9 until the wall reaches the designed height.

Claims

1. A wrapped-back type waste tire reinforced soil retaining wall, characterized in that: It includes waste tires (1), wall floor slabs (2), geogrids (3), connecting pieces (4), self-locking nylon tie mesh sheets (5), temporary baffles (6) and backfill (7); the waste tires (1) are laid horizontally and stacked vertically in a staggered manner, with reserved holes (8) provided on the bottom and top surfaces of the waste tires, and adjacent waste tires (1) are connected by connecting pieces (4) to form a tire wall; the surface of the wall floor slab (2) is provided with grooves (204), in which the waste tires (1) are laid, the backfill (7) is filled and compacted by rolling; the geogrid (3) includes a reinforced geogrid (301) and a wrapped-back geogrid (302); the geogrid (3) is horizontally laid in the backfill (7) and wraps back the waste tires (1), and the reinforced geogrid (301) and the wrapped-back geogrid (302) are connected by the self-locking nylon tie mesh sheet (5); the connecting piece (4) is used to connect adjacent waste tires (1) and the geogrid (3); the temporary baffle (6) plays a role in temporarily fixing the retaining wall when laying waste tires and filling the backfill; The cross-sectional width of the groove (204) is 20 - 40 mm larger than the diameter of the waste tire (1), and the height h = 2t + 150 mm, where t is the cross-sectional width of the waste tire; The connecting piece (4) includes a main connecting piece (401), a screw (402), a nut (403) and a washer (404), all made of cold heading steel; Screw holes are provided on the main connecting piece (401), which are evenly distributed on the upper flange and the lower flange; The self-locking nylon tie mesh sheet (5) is made of PA66, and its unit grid includes nylon ties (501) and cross-shaped ribs (502); The nylon tie (501) is located at the node of the cross-shaped ribs (502), and the width of the nylon tie (501) is 2 mm - 3 mm, and the length is 8 mm - 12 mm.

2. The wrapped-back type waste tire reinforced soil retaining wall according to claim 1, characterized in that: The number of reserved holes (8) on the bottom and top surfaces of the waste tire (1) is 8 each, and the diameter of the reserved hole (8) is 4 mm - 6 mm.

3. The wrapped-back type waste tire reinforced soil retaining wall according to claim 1, characterized in that: The length of the self-locking nylon tie mesh sheet (5) is 800 mm - 1000 mm, and the width is 500 mm - 800 mm more than the width of the geogrid (3).

4. The wrapped-back type waste tire reinforced soil retaining wall according to claim 1, characterized in that: The side length of the unit grid of the self-locking nylon tie mesh sheet (5) is 4 - 5 times that of the unit grid of the geogrid (3).

5. A construction method of the wrapped-back type waste tire reinforced soil retaining wall according to claim 1, characterized in that It includes the following steps: (a) Component preparation: Prefabricate the wall floor slab (2), set reserved holes (8) on the bottom and top surfaces of the waste tire (1), and cut the geogrid (3) and the self-locking nylon tie mesh sheet (5); (b) Earth excavation: Carry out earth excavation according to the design drawings; (c) Foundation construction: Lay the first layer of waste tires (1) in the groove (204) of the wall base plate (2). Connect the bottoms of adjacent first-layer waste tires (1) of the foundation with connecting pieces (4). Then fill the groove (204) with backfill (7), vibrate and compact it until it is backfilled to a position 30 mm - 50 mm from the top surface of the first-layer waste tires (1) of the foundation. Next, lay the second layer of waste tires (1) of the foundation. The second-layer waste tires (1) of the foundation and the first-layer waste tires (1) of the foundation are arranged vertically and staggeredly. Then install a connecting piece (4) at the intersection of the top surface of the first-layer waste tires (1) of the foundation and the bottom surface of the second-layer waste tires (1) of the foundation, so that the first-layer waste tires (1) of the foundation and the second-layer waste tires (1) of the foundation are connected into one body. Then fill the groove (204) with backfill (7), vibrate and compact it until it is backfilled to a position 30 mm - 50 mm from the top surface of the second-layer waste tires (1) of the foundation. Reserve a connecting piece (4) on the top surface of the second-layer waste tires (1) of the foundation. Then fill the backfill (7) to the design elevation of the ground floor; (d) Laying the reinforced geogrid (301): Level the geogrid (3) before laying it, and reserve the laying length of the wrapped-back geogrid (302). First, lay the reinforced geogrid (301). When laying, the reinforced geogrid (301) is perpendicular to the wall height, and its laying length behind the wall is 0.7 - 1.2 times the wall height; (e) Laying the wrapped-back geogrid (302) and the first layer of upper waste tires (1): Lay the first layer of upper waste tires (1) on the reserved wrapped-back geogrid (302). The first layer of upper waste tires (1) and the second layer of waste tires (1) of the foundation are arranged vertically and staggeredly. Connect the second layer of waste tires (1) of the foundation, the wrapped-back geogrid (302) and the first layer of upper waste tires (1) with the reserved connecting piece (4); (f) Laying the second layer of upper waste tires (1) and backfilling the backfill (7) in the waste tires (1): Fill the backfill (7) in the first layer of upper waste tires (1) until it is backfilled to a position 30 mm - 50 mm from the top surface of the first layer of upper waste tires (1). Next, lay the second layer of upper waste tires (1). The second layer of upper waste tires (1) and the first layer of upper waste tires (1) are arranged vertically and staggeredly. Install a connecting piece (4) at the intersection of the top surface of the first layer of upper waste tires (1) and the bottom surface of the second layer of upper waste tires (1), so that the first layer of upper waste tires (1) and the second layer of upper waste tires (1) are connected into one body. Then fill the backfill (7) in the second layer of upper waste tires (1) until it is backfilled to a position 30 mm - 50 mm from the top surface of the second layer of upper waste tires (1). Reserve a connecting piece (4) on the top surface of the second layer of upper waste tires (1). Then fill the backfill (7) to the top surface of the second layer of upper waste tires (1); (g) Laying the wrapped geogrid (302): Surround the upper first layer of waste tires (1) and the upper second layer of waste tires (1) with the wrapped geogrid (302). After the wrapped geogrid (302) wraps the waste tires (1), the end of the wrapped geogrid (302) is horizontally laid at the elevation of the bottom surface of the upper first layer of waste tires (1) and is bonded to the reinforced geogrid (301). Connect the wrapped geogrid (302) and the reinforced geogrid (301) with a self-locking nylon tie mesh (5). Apply a tensile force to the end of the reinforced geogrid (301). After the reinforced geogrid (301) is tightened, fix the end of the reinforced geogrid (301) in the soil with a pin, and connect the horizontally adjacent geogrids (3) with a self-locking nylon tie mesh (5); (h) Arranging the temporary baffle (6): Arrange the temporary baffle (6) at the front end of the retaining wall to make it close to the tire wall to prevent the tire wall from having a large displacement when backfilling the backfill material (7) behind the tire wall; (i) Backfilling the backfill material (7) behind the wall: Backfill the backfill material (7) behind the wall to the top surface of the upper second layer of waste tires (1) and vibrate and compact it; (j) Repeat the above steps (d) to (i) until the wall reaches the designed height.

Images