Bow-shaped combined retaining wall structure provided with outer cantilever arms and construction method of bow-shaped combined retaining wall structure

Abstract

The invention provides a bow-shaped combined retaining wall structure provided with an outer cantilever arm and a construction method thereof.The bow-shaped combined retaining wall structure comprises a bow-shaped retaining wall, a plurality of reinforced concrete stand columns, the bow-shaped retaining wall and the outer cantilever arm, the bow-shaped retaining wall comprises a cast-in-place front chord wall, a prefabricated rear chord wall and a bottom plate, and the two ends of the rear chord wall are hinged to the two reinforced concrete stand columns respectively; the bottom plate comprises a heel plate extending to one side of filling soil and a toe plate extending to one side of retaining soil, and a tenon is arranged at the bottom of the heel plate; the multiple reinforced concrete stand columns are arranged between the arch-shaped retaining walls at intervals and are integrally poured with the front chord walls and the bottom plates of the arch-shaped retaining walls. A reinforcing framework is arranged in the reinforced concrete stand column. Connecting joints are reserved at the upper ends of the reinforced concrete stand columns; the outer cantilever arm is arranged on the free side of the top of each reinforced concrete stand column and comprises a steel structure beam lattice, a prefabricated sidewalk slab and subsidiary facilities, the prefabricated sidewalk slab is laid on the steel structure beam lattice, and the subsidiary facilities are arranged on the two sides of the prefabricated sidewalk slab.

Description

Technical Field

[0001] This invention relates to the field of civil engineering technology, and in particular to an arch-shaped composite retaining wall structure with cantilevered arms and its construction method. Background Technology

[0002] Retaining walls are commonly used support structures for handling elevation differences and stabilizing slopes in municipal roads, highways, and other infrastructure construction. Currently, reinforced concrete retaining walls are widely used, mainly including cantilever retaining walls and buttress retaining walls. Reinforced concrete retaining walls have advantages such as good integrity, superior load-bearing capacity, and reliable durability. However, their application also has certain limitations: cantilever retaining walls have a relatively simple structure and are easy to construct, but their economically reasonable support height is usually below 6 meters. As the wall height increases, the bending moment and shear force at the base of the wall increase sharply, leading to excessive cross-sectional dimensions and reinforcement, significantly reducing economic efficiency. Buttress retaining walls enhance the connection between the wall body and the base slab by adding buttresses, improving the overall stiffness and load-bearing capacity of the structure. They are suitable for higher retaining walls above 6 meters, but their disadvantages are also quite obvious: complex structural formwork, large amount of formwork work, dense reinforcement arrangement, and cumbersome construction procedures.

[0003] In urban renewal and road widening projects, complex site conditions are often encountered. For example, the construction of retaining walls may require avoiding existing buildings, underground pipelines, or other important structures, necessitating the setback of the retaining walls. This avoidance behavior directly encroaches on the planned road width, resulting in insufficient space for carriageways or sidewalks, thus affecting the road's traffic capacity and service level.

[0004] Therefore, how to provide an arch-shaped composite retaining wall structure with cantilevered arms and its construction method is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] To address the aforementioned problems in existing technologies, this invention proposes an arch-shaped composite retaining wall structure with cantilever arms and its construction method. By hinged an arc-shaped rear chord wall to a reinforced concrete column in a typical section of the retaining wall, the horizontal earth pressure acting on the retaining wall structure can be significantly reduced. Furthermore, a steel cantilever arm is installed at the top of the column, enabling the retaining wall to achieve a greater support height and good overall stability with a smaller footprint. Simultaneously, the cantilever arm serves as a sidewalk load-bearing component to expand the road cross-section. The structure is simple, occupies little space, and can extend the road width outwards, especially the sidewalk width, thereby effectively avoiding existing structures and improving the traffic efficiency and safety of municipal roads.

[0006] The technical solution of the present invention for an arch-shaped composite retaining wall structure with cantilevered arms and its construction method is as follows:

[0007] An arch-shaped composite retaining wall structure with cantilevered arms includes:

[0008] An arched retaining wall includes a front chord wall, a rear chord wall, and a base slab. The front chord wall is a cast-in-place reinforced concrete structure, and the rear chord wall is a precast reinforced concrete structure with an arc-shaped plan. The two ends of the rear chord wall are respectively hinged to two reinforced concrete columns. The base slab includes a heel plate extending towards the backfill side and a toe plate extending towards the retaining side. The bottom of the heel plate is provided with a tenon.

[0009] Multiple reinforced concrete columns are spaced apart between the arched retaining walls and are integrally cast with the front chord wall and the base plate of the arched retaining walls; the reinforced concrete columns are equipped with a reinforcing frame inside; and connection nodes are reserved at the upper end of the reinforced concrete columns.

[0010] The cantilever arm is located on the top open side of each of the reinforced concrete columns. The cantilever arm includes a steel structure beam grid, a precast sidewalk slab, and auxiliary facilities. The precast sidewalk slab is laid on the steel structure beam grid, and the auxiliary facilities are located on both sides of the precast sidewalk slab.

[0011] Furthermore, the steel structure beam grid includes welded transverse H-beams and longitudinal H-beams. The connection nodes between the transverse H-beams and the upper end of the reinforced concrete column are formed by full welding or high-strength bolts to form rigid joints. The joints are provided with web plates and flange stiffening ribs.

[0012] Furthermore, the radius of the arc of the rear chord wall is 4 to 8 meters.

[0013] Furthermore, the interval between the reinforced concrete columns is 4 to 5 meters.

[0014] Furthermore, the ancillary facilities include railings and sidewalk paving.

[0015] Furthermore, the cross-section of the reinforced concrete column is rectangular, I-shaped, or box-shaped.

[0016] Furthermore, the supporting structure of the precast sidewalk slab includes a concrete curbstone cast after the top surface of the arched retaining wall, and two longitudinal H-beams on the steel structure beam grid, with the precast sidewalk slab resting on the curbstone and the longitudinal H-beams.

[0017] Furthermore, the railing is connected to the cantilever arm via a railing base. The railing base is a rectangular steel pipe, welded to the upper flange of the longitudinal H-beam of the outermost cantilever arm. The railing is welded or bolted to the railing base.

[0018] The present invention also provides a construction method for an arch-shaped composite retaining wall structure with cantilevered arms, the construction method comprising the following steps:

[0019] Step S1, Construction of the arched retaining wall and pre-embedded column structure: First, foundation excavation and ground treatment are carried out; then, a reinforced concrete base slab is poured, the base slab including a heel plate and a toe plate, and an anti-slip tenon is formed at the bottom of the heel plate; next, when pouring the base slab, the construction positions and reinforcing bars of the reinforced concrete columns are reserved at preset intervals along the direction of the retaining wall; finally, the front chord wall reinforcing bars are tied and the formwork is erected for the in-situ construction of the front chord wall;

[0020] Step S2, constructing reinforced concrete columns: First, at the reserved column position, hoist the H-shaped steel reinforcing frame, anchor its lower end in the base plate, extend its upper end vertically to the design height, and connect it with the reserved steel bars of the base plate and the front chord wall; then erect the column formwork, and pour concrete as a whole with the front chord wall and the base plate to form a reinforced concrete column with an internal H-shaped steel reinforcing frame.

[0021] Step S3, Installation of rear chord wall and backfilling: First, hoist the prefabricated rear chord wall so that its two ends are respectively connected to the two reinforced concrete columns; then backfill soil behind the rear chord wall and fill the arch-shaped cavity formed by the front chord wall, rear chord wall and bottom plate with lightweight material.

[0022] Step S4, Install the cantilever arm: First, install a horizontal H-beam on the top of the reinforced concrete column on the open side, rigidly connecting it with the H-beam reinforcement frame inside the column to form a horizontal load-bearing component; then weld longitudinal H-beams onto the horizontal H-beams to form a steel structure beam grid; next, pour concrete curb stones on the top surface of the retaining wall; then lay precast sidewalk slabs on the concrete curb stones and the longitudinal H-beams of the steel structure beam grid; finally, install railings on the outermost side of the steel structure beam grid.

[0023] The arch-shaped composite retaining wall structure with cantilevered arms and its construction method have the following advantages:

[0024] 1. The arch-shaped combined retaining wall structure with cantilevered arms of the present invention can significantly reduce the earth pressure acting on the retaining wall structure by setting an arc-shaped rear chord wall, thereby significantly increasing the support height of the retaining wall. At the same time, the cross-section of the columns can be adopted as I-shaped, box-shaped, etc., depending on the situation, which significantly reduces the amount of engineering materials used and improves economy;

[0025] 2. The bow-shaped combined retaining wall structure with cantilevered arms of the present invention utilizes the strong bearing capacity of reinforced concrete columns to cantilever a pedestrian platform to the open side. This allows the retaining wall foundation to avoid existing structures while the superstructure can "cross" the restrictions, restoring or increasing the road width, thus solving common land use conflicts in urban construction and possessing extremely high engineering practical value.

[0026] 3. The bow-shaped combined retaining wall structure with cantilever arms of the present invention can achieve factory prefabrication of core load-bearing components (reinforcing frame, cantilever beam grid, rear chord wall) and surface components (precast sidewalk slabs). On-site welding and hoisting are the main methods, which reduces a lot of on-site wet work and complex formwork support system, significantly simplifies the construction process, improves construction efficiency and shortens the construction period. Attached Figure Description

[0027] Figure 1 This is a cross-sectional schematic diagram of an arch-shaped combined retaining wall structure with cantilevered arms in one embodiment of the present invention;

[0028] Figure 2 This is an elevation view of an arched retaining wall with cantilevered arms, according to an embodiment of the present invention.

[0029] Figure 3 This is a cross-sectional view of a steel-concrete composite retaining wall with cantilevered arms in one embodiment of the present invention.

[0030] Figure 4 This is a cross-sectional view of the cantilever arm of an arch-shaped combined retaining wall structure with cantilever arms in one embodiment of the present invention;

[0031] Figure 5 This is an exterior elevation view of an arch-shaped combined retaining wall structure with cantilevered arms according to an embodiment of the present invention;

[0032] Figure 6 This is a schematic diagram of the prefabricated rear chord wall installation joint of an arch-shaped combined retaining wall structure with cantilevered arms in one embodiment of the present invention.

[0033] Figure 7 This is an embodiment of the present invention of a prefabricated rear chord wall and column connection method for an arch-shaped combined retaining wall structure with cantilevered arms;

[0034] Figure 8 This is a schematic diagram of the stress on a retaining wall with an outwardly cantilevered arch-shaped combined retaining wall structure according to an embodiment of the present invention.

[0035] In the picture:

[0036] 10-General section arched retaining wall; 11-Front chord wall; 12-Rear chord wall; 20-Base slab; 21-Heel slab; 22-Toe slab; 23-Tenon; 30-Reinforced concrete column; 31-Reinforcing frame; 40-Cantilever arm; 41-Transverse H-beam of cantilever arm; 42-Longitudinal H-beam of cantilever arm; 43-Precast sidewalk slab; 44-Guardrail; 45-Sidewalk paving; 46-Concrete curbstone; 47-Guardrail base. Detailed Implementation

[0037] The following detailed description, in conjunction with the accompanying drawings and specific embodiments, provides a further detailed account of the arch-shaped composite retaining wall structure with cantilevered arms and its construction method according to the present invention. The advantages and features of the present invention will become clearer from the following description and claims. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0038] Example 1

[0039] refer to Figures 1 to 8 This invention provides a detailed description of the structural composition of the bow-shaped combined retaining wall structure with cantilevered arms of the present invention.

[0040] Please continue to refer to this. Figures 1 to 8 A cantilevered arch-shaped composite retaining wall structure (support height H = 8m) includes an arch-shaped retaining wall, reinforced concrete columns 30, and cantilevered arms 40. The arch-shaped retaining wall, specifically the general section arch-shaped retaining wall 10, is a reinforced concrete structure consisting of a front chord wall 11, a rear chord wall 12, and a base slab 20. The front chord wall 11 is a cast-in-place reinforced concrete structure; the rear chord wall 12 is a precast reinforced concrete structure with a circular arc shape and a radius of 4–8m. The two ends of the rear chord wall 12 are hinged to two reinforced concrete columns 30, respectively. According to the structural stress diagram of the retaining wall (see...),... Figure 8 This structure significantly reduces the horizontal earth pressure acting on the reinforced concrete column 30. The base plate 20 includes a heel plate 21 extending towards the backfill side and a toe plate 22 extending towards the retaining side. The bottom of the heel plate 21 may be provided with a tenon to improve anti-sliding stability. The concrete strength grade is C30 to C40, and the reinforcement uses HRB400.

[0041] In this embodiment, more preferably, reinforced concrete columns 30 are spaced 4-5 meters apart between the general section arched retaining walls 10, and are integrally cast with the front chord wall 11 and the base plate 20 of the general section arched retaining walls 10. The cross-section of the reinforced concrete columns 30 can be rectangular, I-shaped, box-shaped, etc. To increase the bending strength of the reinforced concrete columns 30, a reinforcing frame 31 can be set inside the reinforced concrete columns 30. The reinforcing frame 31 can be made of H-beams, I-beams, channel steel, etc. A welding node or high-strength bolt connection node is reserved at the upper end of the reinforced concrete columns 30 for connection with the transverse H-beams 41 of the cantilever arm. The H-beam material is preferably Q355 or Q390.

[0042] In this embodiment, more preferably, the cantilever arm 40 is disposed on the top open side of each steel-concrete column 30, and the cantilever arm 40 includes:

[0043] (1) Steel structure beam grid: A transverse H-beam is set at the top of each reinforced concrete column 30, which is connected to the H-beam inside the reinforced concrete column 30 by full welding or high-strength bolts to form a rigid connection node. The node is provided with web plate and flange stiffening ribs; Two longitudinal H-beams 42 are welded to the middle and outer ends of the transverse H-beam 41 of the cantilever arm respectively. The longitudinal H-beam 42 of the cantilever arm is connected to the transverse H-beam 41 of the cantilever arm of the adjacent column to form a beam grid, forming a sidewalk load-bearing beam grid system.

[0044] (2) Precast sidewalk slab 43: It is made of reinforced concrete and is laid in sections on the steel structure beam grid of the cantilever arm 40.

[0045] (3) Ancillary facilities: including the railing 44 set on the outermost side of the cantilever arm 40 and the sidewalk paving 45 laid on the precast sidewalk slab 43.

[0046] In this embodiment, more preferably, the supporting structure of the precast sidewalk slab 43 includes a concrete curbstone 46 cast post-cast on the top surface of the retaining wall, and two cantilevered longitudinal H-beams 42 on the steel structure beam. The precast sidewalk slab 43 rests on the concrete curbstone 46 and the cantilevered longitudinal H-beams 42.

[0047] In this embodiment, more preferably, the railing 44 is connected to the cantilever arm 40 via a railing base 47. The railing base 47 is a rectangular steel pipe, welded to the upper flange of the outermost longitudinal H-beam 42 of the cantilever arm, and the railing 44 is welded or bolted to the railing base 47.

[0048] In this embodiment, more preferably, the thickness of the prefabricated sidewalk slab 43 is 8cm to 10cm, the planar dimensions are 0.5m to 1.0m in width and 1.5m to 2.0m in length, which facilitates hoisting and laying.

[0049] Please continue to refer to this. Figures 1 to 8This embodiment also provides a construction method for an arch-shaped composite retaining wall structure with cantilevered arms (taking a retaining wall with a support height of 8m as an example). The method mainly includes the following steps:

[0050] Step S1: Construction of the arched retaining wall: First, excavate the foundation and treat the ground. Then, construct the reinforced concrete base slab 20, which consists of a heel plate 21, a toe plate 22, and an anti-slip tenon 23 at the bottom. The base slab 20 is 0.4m thick, the toe plate 22 is 1m wide, and the heel plate 21 is 3m wide. When pouring the concrete for the base slab 20, according to the design drawings, reserve the positions of reinforced concrete columns 30 every 4-5 meters along the direction of the retaining wall. Subsequently, tie the reinforcement and erect the formwork for the front chord wall 11, which is 0.3m thick. At the same time, prefabricate the rear chord wall 12 on the construction site or in the factory, with each section being 1m long and 0.2m thick. The concrete strength grade is C30-C40, and the reinforcement uses HRB400. The rear chord wall 12 has an arc shape with a radius of 5m. The two ends of the rear chord wall 12 are hinged to two reinforced concrete columns 30, respectively. Figure 8 The design of this structure can significantly reduce the horizontal earth pressure acting on the reinforced concrete column 30;

[0051] Step S2: Construction of Reinforced Concrete Column 30: In this example, the reinforced concrete column 30 adopts an I-shaped section with a height of 0.9m, a flange width of 0.7m and a thickness of 0.2m, and a web thickness of 0.3m. To increase the bending strength of the reinforced concrete column 30, a reinforcing frame 31 is installed inside the column 30. The reinforcing frame 31 is made of H-beams. In the wall construction area, the prefabricated H-beam frame is hoisted into place. The lower end of the H-beam frame is anchored in the base plate 20, and the upper end extends vertically through the height of the wall. Studs with a diameter of 16mm and a length of 80mm have been pre-welded to the web and flanges of the H-beam frame. The studs are spaced 200mm apart and arranged in a staggered pattern to enhance the bond between the steel and the concrete. After the H-beam frame is in place, it is securely connected to the reserved reinforcing bars of the wall and the base plate 20. Finally, the formwork in the column area is closed together with the wall formwork, and the concrete for the wall and column is poured as a whole (see...). Figure 1 This forms an integral structure consisting of a steel-concrete composite column 30 and a general arched retaining wall 10. The elevation of the steel-concrete composite column retaining wall is shown below. Figure 3 ;

[0052] Step S3: Backfilling Construction: After the arched retaining wall and reinforced concrete column 30 are poured, the precast rear chord wall 12 is hoisted. The two ends of the rear chord wall 12 are hinged to the reinforced concrete column 30 (see...). Figure 7 After the rear chord wall 12 is hoisted, backfill soil is added behind the wall. After the backfilling of the rear chord wall 12 is completed, the arch-shaped cavity is filled with a permeable lightweight material. For the caulking construction of the precast rear chord wall, see [link to caulking instructions]. Figure 6 .

[0053] Step S4: Installation of the cantilever arm 40:

[0054] After the backfilling work was completed, the 40mm cantilever arm was installed.

[0055] 1. Installation of the steel structure beam grid: At the top of each steel-concrete composite column, on the open side, a cantilevered transverse H-beam 41 is fully welded or connected to the flange of the pre-embedded H-beam frame within the column using welding or high-strength bolts. The H-beam connection nodes are reinforced with web and flange stiffeners. Subsequently, two parallel cantilevered longitudinal H-beams 42 are welded to the middle and outer ends of all the cantilevered transverse H-beams 41. These two longitudinal H-beams 42 extend along the retaining wall, connecting with all the transverse H-beams to form a stable steel structure beam grid.

[0056] 2. Casting the curbstone: On the top surface of the retaining wall, near the side of the cantilever arm, cast a concrete curbstone 46 on site as the inner support of the precast sidewalk slab 43.

[0057] 3. Installation of Precast Sidewalk Slabs 43: After the concrete curbstone 46 has cured for 7 days and reached a certain strength, the precast reinforced concrete sidewalk slabs (10cm thick, 0.8m wide, and 1.8m long) are hoisted one by one. Two sidewalk slabs are installed on each sidewalk section. One slab rests at one end on the post-cast curbstone and at the other end on the upper flange of the two longitudinal H-beams 42 of the cantilever arms. The other slab rests at both ends on the upper flange of the two longitudinal H-beams 42 of the cantilever arms. Elastic pads are placed under the precast sidewalk slabs 43, and the joints are sealed.

[0058] 4. Install the railing 44: Weld a rectangular steel pipe as the railing base 47 to the upper flange of the outermost longitudinal H-beam 42 of the cantilever arm. The rectangular steel pipe has dimensions of 15cm × 20cm and a wall thickness of 3mm. Then, weld the finished steel railing posts onto these bases to form a continuous safety railing.

[0059] 5. Laying the pavement layer: After all the precast sidewalk slabs 43 are installed, lay a sidewalk pavement layer such as anti-slip tiles or asphalt on them to complete the construction of the entire cantilever arm 40 (see...). Figure 4 ).

[0060] Through the above steps, the construction of a steel-concrete composite retaining wall with cantilevered arms is completed. See the exterior elevation drawing. Figure 5 The retaining wall of this invention is suitable for conventional roadbed retaining walls with a height range of 6 to 15 meters. For special geological conditions (soft soil, landslides, and highly expansive soil), foundation treatment or special stability analysis is required first.

[0061] The above description is merely a description of preferred embodiments of the present invention and is not intended to limit the scope of the present invention in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the protection scope of the claims.

Claims

1. A bow-shaped composite retaining wall structure with cantilevered arms, characterized in that, include: An arched retaining wall includes a front chord wall, a rear chord wall, and a base slab. The front chord wall is a cast-in-place reinforced concrete structure, and the rear chord wall is a precast reinforced concrete structure with an arc-shaped plan. The two ends of the rear chord wall are respectively hinged to two reinforced concrete columns. The base slab includes a heel plate extending towards the backfill side and a toe plate extending towards the retaining side. The bottom of the heel plate is provided with a tenon. Multiple reinforced concrete columns are spaced apart between the arched retaining walls and are integrally cast with the front chord wall and the base plate of the arched retaining walls; the reinforced concrete columns are equipped with a reinforcing frame inside; and connection nodes are reserved at the upper end of the reinforced concrete columns. The cantilever arm is located on the top open side of each of the reinforced concrete columns. The cantilever arm includes a steel structure beam grid, a precast sidewalk slab, and auxiliary facilities. The precast sidewalk slab is laid on the steel structure beam grid, and the auxiliary facilities are located on both sides of the precast sidewalk slab.

2. The arch-shaped combined retaining wall structure with cantilevered arms according to claim 1, characterized in that, The steel structure beam grid includes welded transverse H-beams and longitudinal H-beams. The connection nodes between the transverse H-beams and the upper end of the reinforced concrete columns are formed by full welding or high-strength bolts to form rigid joints. The joints are provided with web plates and flange stiffening ribs.

3. The arch-shaped combined retaining wall structure with cantilevered arms according to claim 1, characterized in that, The radius of the arc of the rear chord wall is 4 to 8 meters.

4. The arch-shaped combined retaining wall structure with cantilevered arms according to claim 1, characterized in that, The interval between the reinforced concrete columns is 4 to 5 meters.

5. The arch-shaped combined retaining wall structure with cantilevered arms according to claim 1, characterized in that, The ancillary facilities include railings and sidewalk paving.

6. The arch-shaped combined retaining wall structure with cantilevered arms according to claim 1, characterized in that, The reinforced concrete column has a rectangular, I-shaped, or box-shaped cross-section.

7. The arch-shaped combined retaining wall structure with cantilevered arms according to claim 1, characterized in that, The supporting structure of the precast sidewalk slab includes a concrete curbstone cast on the top surface of the arched retaining wall and two longitudinal H-beams on the steel structure beam grid. The precast sidewalk slab rests on the curbstone and the longitudinal H-beams.

8. The arch-shaped combined retaining wall structure with cantilevered arms according to claim 1, characterized in that, The railing is connected to the cantilever arm via a railing base. The railing base is a rectangular steel pipe, welded to the upper flange of the longitudinal H-beam of the outermost cantilever arm. The railing is welded or bolted to the railing base.

9. A construction method for an arch-shaped composite retaining wall structure with cantilevered arms, characterized in that, Includes the following steps: Step S1, Construction of the arched retaining wall and pre-embedded column structure: First, foundation excavation and ground treatment are carried out; then, a reinforced concrete base slab is poured, the base slab including a heel plate and a toe plate, and an anti-slip tenon is formed at the bottom of the heel plate; next, when pouring the base slab, the construction positions and reinforcing bars of the reinforced concrete columns are reserved at preset intervals along the direction of the retaining wall; finally, the front chord wall reinforcing bars are tied and the formwork is erected for the in-situ construction of the front chord wall; Step S2, constructing reinforced concrete columns: First, at the reserved column position, hoist the H-shaped steel reinforcing frame, anchor its lower end in the base plate, extend its upper end vertically to the design height, and connect it with the reserved steel bars of the base plate and the front chord wall; then erect the column formwork, and pour concrete as a whole with the front chord wall and the base plate to form a reinforced concrete column with an internal H-shaped steel reinforcing frame. Step S3, Installation of rear chord wall and backfilling: First, hoist the prefabricated rear chord wall so that its two ends are respectively connected to the two reinforced concrete columns; then backfill soil behind the rear chord wall and fill the arch-shaped cavity formed by the front chord wall, rear chord wall and bottom plate with lightweight material. Step S4, Install the cantilever arm: First, install a horizontal H-beam on the top of the reinforced concrete column on the open side, rigidly connecting it with the H-beam reinforcement frame inside the column to form a horizontal load-bearing component; then weld longitudinal H-beams onto the horizontal H-beams to form a steel structure beam grid; next, pour concrete curb stones on the top surface of the retaining wall; then lay precast sidewalk slabs on the concrete curb stones and the longitudinal H-beams of the steel structure beam grid; finally, install railings on the outermost side of the steel structure beam grid.

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