Retaining wall

Abstract

According to the retaining wall, an inserting part matched with a hollow cavity or the outer contour of a box beam is arranged on a seat body, so that the box beam is rapidly and accurately positioned and fixed to the seat body in an inserting mode. The function conversion from a bridge member to a retaining wall is completed on the premise that the main body structure of the concrete box beam obtained by dismantling the simply supported beam bridge is not changed; therefore, the problems of high resource consumption, long construction period and environmental pressure caused by low-valued treatment of waste bridge components in the construction process of a traditional retaining wall are solved. Meanwhile, a plurality of bridge conversion retaining wall components are continuously arranged along the direction of a line to form a linear soil retaining structure, and good overall stability and space continuity are achieved. The whole structure is convenient for mechanical construction, the field operation time is shortened, and the engineering construction efficiency is improved.

Description

Technical Field

[0001] This invention generally relates to the field of retaining wall structure technology, and more particularly to a retaining wall. Background Technology

[0002] Retaining walls are a widely used support structure in the construction of highways, railways, and municipal engineering projects. Retaining walls are structures that support roadbed fill or hillside soil, preventing deformation and instability of the fill or soil. Based on their structural characteristics, retaining walls can be classified into gravity retaining walls, counterweight retaining walls, cantilever retaining walls, reinforced soil lightweight retaining walls, and concrete semi-gravity retaining walls, among others.

[0003] In related technologies, retaining walls are constructed using either cast-in-place concrete or precast concrete in factories. Cast-in-place retaining walls have disadvantages such as long construction periods, large on-site workload, difficulty in quality control, and significant environmental impact; while precast retaining walls can partially overcome these disadvantages, their production costs remain relatively high. Summary of the Invention

[0004] The present invention provides a retaining wall, comprising: prefabricated splicing components and a base.

[0005] The precast splice is a concrete box girder disassembled from a simply supported beam bridge, and the concrete box girder has a hollow cavity; The base includes a base body, on which a plug-in portion adapted to the hollow cavity is provided, and the hollow cavity is plugged into the plug-in portion. Alternatively, the base body is provided with a plug-in portion adapted to the outer contour of the concrete box girder, and the concrete box girder is plugged into the plug-in portion, so that the concrete box girder is fixedly connected to the base body.

[0006] As one possible implementation, the concrete box girder includes a first web and a second web of the box girder arranged opposite to each other. Several concrete box girders are arranged in the same direction, with the first web of one of the adjacent concrete box girders close to each other, or the first web of one of the adjacent concrete box girders close to each other.

[0007] As an alternative implementation, the concrete box girder further includes a box girder top plate and a box girder bottom plate disposed opposite each other, wherein the box girder top plate, the box girder first web plate, the box girder bottom plate, and the box girder second web plate are connected end to end in sequence to form the hollow cavity. The base has a plurality of insertion protrusions arranged in the same direction. The insertion protrusions are configured as insertion parts. Each insertion protrusion includes a positioning surface, which is in contact with the inner surface of the top plate of the box girder or the inner surface of the bottom plate of the box girder.

[0008] As an implementation method, the cross-section of the insertion protrusion gradually decreases along its extension direction, and the length of the insertion protrusion is less than the length of the hollow cavity.

[0009] As an implementation method, the base body is provided with an installation cavity with one end open, the opening being used for the concrete box girder to enter the installation cavity, and the installation cavity is at least partially configured as the insertion part for positioning the concrete box girder.

[0010] In one possible implementation, the mounting cavity includes a lower support platform located below the base body and an upper support platform located above the base body. The lower support platform has a lower mounting cavity, and the upper support platform has an upper mounting cavity. The upper mounting cavity and the lower mounting cavity communicate to form the mounting cavity, and the lower mounting cavity is the insertion part. There is a first pouring space between the concrete box girder and the cavity sidewall of the upper mounting cavity. Concrete is poured into the first pouring space so that the base body and each of the concrete box girders are connected as one unit.

[0011] As an alternative implementation, a capping annular beam is also included, wherein the cross-sectional shape of the capping annular beam is the same as that of the concrete box girder. The capping annular beam is cast and connected to the other end of the concrete box girder along its length. The capping annular beam includes a first segment, a second segment, a third segment, and a fourth segment connected end to end in sequence. The first segment and the third segment are arranged parallel to each other, the second segment is arranged parallel to the first web of the box girder, and the fourth segment is arranged parallel to the second web of the box girder. The second segment is positioned vertically opposite to the first web of one of the several concrete box girders, and the fourth segment is positioned vertically opposite to the second web of another of the several concrete box girders.

[0012] As an implementation method, the second segment is arranged vertically opposite to the first web of the outermost of the several concrete box girders, and the fourth segment is arranged vertically opposite to the second web of the other outermost of the several concrete box girders.

[0013] As an alternative method, concrete is poured into a third pouring space formed by the capping annular beam and the other end of the concrete box girder along their length. The retaining wall also includes a guardrail, which is connected to the capping ring beam by concrete pouring.

[0014] As an implementation method, when the first web of one of the adjacent concrete box girders and the second web of the other box girder are close to each other... The concrete box girder also includes a box girder top plate and a box girder bottom plate arranged opposite each other. The box girder top plate, the box girder first web plate, the box girder bottom plate, and the box girder second web plate are connected end to end to form the hollow cavity. A first flange plate and a second flange plate extend outward from both sides of the box girder top plate. The first flange plate is located close to the box girder first web plate, and the second flange plate is located close to the box girder second web plate. The first web and first flange of one of the adjacent concrete box girders, together with the second web and second flange of the other, form a second casting space. Concrete is poured into the second casting space to connect the adjacent concrete box girders into one unit.

[0015] The above-mentioned solution, in this application, utilizes interlocking parts on the base that are adapted to the hollow cavity or external contour of the box girder, enabling the box girder to be quickly and accurately positioned and fixed to the base via interlocking. The concrete box girder obtained from the demolition of a simply supported beam bridge is transformed from a bridge component into a retaining wall without altering the main structure of the concrete box girder; thus solving the problems of high resource consumption, long construction period, and environmental pressure caused by the low-value disposal of discarded bridge components in traditional retaining wall construction. Simultaneously, multiple first precast splice components are continuously arranged along the route, forming a linear retaining structure with good overall stability and spatial continuity. The entire structure facilitates mechanized construction, shortens on-site operation time, and improves project construction efficiency. Attached Figure Description

[0016] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram of a retaining wall provided in an embodiment of the present invention; Figure 2 This is an exploded structural diagram of a retaining wall provided in an embodiment of the present invention; Figure 3 A schematic cross-sectional view of a retaining wall provided in an embodiment of the present invention; Figure 4 for Figure 3 Schematic diagram of the cross-section at point AA; Figure 5 for Figure 3 Schematic diagram of the cross-section at point BB; Figure 6 A cross-sectional schematic diagram of another retaining wall provided in an embodiment of the present invention; Figure 7 A top view schematic diagram of another type of retaining wall provided in an embodiment of the present invention; Figure 8A schematic diagram of the installation cavity structure of another retaining wall provided in an embodiment of the present invention; 10. Concrete box girder, 11. Box girder top plate, 12. Box girder bottom plate, 13. Box girder first web plate, 14. Box girder second web plate, 15. First flange plate, 16. Hollow cavity, 101. Drainage hole, 102. Base 20, seat body 21, insertion protrusion 22, positioning surface 221, upper support platform 231, lower support platform 232, mounting cavity 2301; The capping ring beam 30, the first section 31, the second section 32, the third section 33, and the fourth section 34; Guardrail 40, second pouring space C, third pouring space D. Detailed Implementation

[0017] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0018] like Figures 1-8 As shown, this application proposes a retaining wall, including: precast splicing components and a base 20. The precast splicing components are concrete box girders 10 disassembled from a simply supported beam bridge, and the concrete box girders 10 have a hollow cavity 101. The base 20 includes a seat body 21, on which a plug-in portion adapted to the hollow cavity 101 is provided, and the hollow cavity 101 is plugged into the plug-in portion. Alternatively, the seat body 21 is provided with a plug-in portion adapted to the outer contour of the concrete box girders 10, and the concrete box girders 10 are plugged into the plug-in portion, so that the concrete box girders 10 are fixedly connected to the seat body 21. The concrete box girders 10 constitute the wall body of the retaining wall.

[0019] Among them, the concrete box girder 10 dismantled from the simply supported beam bridge requires visual inspection and load testing to ensure the structural safety and service reliability of the reused concrete box girder 10. Visual inspection includes visual examination or auxiliary instrument detection of surface cracks, concrete spalling, steel reinforcement corrosion, and damage to the prestressed anchorage zone of the concrete box girder 10 to determine whether there are obvious defects affecting structural integrity. For example, if cracks exist on the surface of the concrete box girder 10, the crack width should be less than or equal to 0.15 mm, the depth less than or equal to 30 mm, and the cracks should be pressure-sealed and filled with sealant. Load testing includes testing the strength grade of the concrete box girder 10; the strength grade of the concrete box girder 10 must be at least greater than or equal to C30. Only after both visual inspection and load testing are deemed qualified can the concrete box girder 10 be allowed to enter the subsequent modification and installation process. This quality access mechanism constructs a complete closed loop for reuse technology, effectively avoiding safety risks caused by component aging or hidden damage.

[0020] The base 20 includes a seat 21, which is a cast-in-place reinforced concrete structure. In one embodiment, such as... Figures 3-5 As shown, the seat 21 is provided with a plug-in portion that fits the hollow cavity 101. The plug-in portion is a protrusion extending upward from the upper surface of the seat 21, and the cross-sectional profile of the protrusion matches the inner profile of the hollow cavity 101 of the concrete box girder 10. The plug-in portion can be integrally formed with the seat 21 by cast-in-place molding, or it can be assembled with the seat 21 by separate molding. Alternatively, In another embodiment, such as Figures 7-8 As shown, the seat 21 is provided with an insertion part that is adapted to the outer contour of the concrete box girder 10. The insertion part is either a ring extending upward from the upper surface of the seat 21 or a groove recessed from the upper surface of the seat 21 to its lower surface.

[0021] The plug-in part is plugged into the hollow cavity 101, or the concrete box girder 10 is plugged into the plug-in part, so that the concrete box girder 10 is fixedly connected to the base 21, and the concrete box girder 10 is used as the wall body of the retaining wall. In this way, the function of the concrete box girder 10 is switched from a bridge component to a retaining wall without changing the main structure of the concrete box girder 10.

[0022] In summary, this application, by providing an insertion part on the base 21 that matches the hollow cavity 101 or external contour of the box girder, enables the box girder to be quickly and accurately positioned and fixed to the base 21 via an insertion method. The concrete box girder 10 obtained from the demolition of the simply supported beam bridge is transformed from a bridge component into a retaining wall without altering its main structure; thus solving the problems of high resource consumption, long construction period, and environmental pressure caused by the low-value disposal of discarded bridge components in traditional retaining wall construction. Simultaneously, multiple first precast splice components are continuously arranged along the route to form a linear retaining structure, exhibiting good overall stability and spatial continuity. The entire structure facilitates mechanized construction, shortens on-site operation time, and improves project construction efficiency.

[0023] The following examples illustrate the structure of retaining walls in detail: The concrete box girder 10 includes a first web 13 and a second web 14 arranged opposite to each other. Several concrete box girders 10 are arranged in the same direction, with the first web 13 of one adjacent concrete box girder 10 being close to the first web 13 of another adjacent concrete box girder 10, or the first web 13 of one adjacent concrete box girder 10 being close to the second web 14 of another adjacent concrete box girder 10.

[0024] In the first specific embodiment, reference is made to Figure 6 As shown, the concrete box girder 10 includes a box girder top plate 11 and a box girder bottom plate 12 arranged opposite to each other, and a box girder first web plate 13 and a box girder second web plate 14 arranged opposite to each other. The box girder top plate 11, the box girder first web plate 13, the box girder bottom plate 12 and the box girder second web plate 14 are connected end to end in sequence to form the hollow cavity 101.

[0025] Several concrete box girders 10 are arranged in the same direction, with the first web 13 of one box girder close to the first web 13 of another box girder. Correspondingly, the base 21 is provided with several insertion protrusions 22 arranged in the same direction, which are configured as the aforementioned insertion parts. In this way, a continuous retaining wall is formed by splicing multiple concrete box girders 10 side by side.

[0026] In the second specific embodiment, refer to Figures 3-5 As shown, several concrete box girders 10 are arranged in the same direction, with the first web 13 of one box girder and the second web 14 of another box girder close to each other. Correspondingly, the base 21 is provided with several insertion protrusions 22 arranged in the same direction, which are configured as the aforementioned insertion parts. In this way, a continuous retaining wall is formed by splicing multiple concrete box girders 10 side by side.

[0027] Furthermore, such as Figure 4 or Figure 5 As shown, the length of the insertion protrusion 22 is less than the length of the hollow cavity 101, and the cross-section of the insertion protrusion 22 gradually decreases along its extension direction. The insertion protrusion 22 can be, but is not limited to, conical, and facilitates the rapid insertion of the insertion protrusion 22 into the hollow cavity 101 of the concrete box girder 10 during on-site hoisting. The remaining space in the hollow cavity 101 is filled with crushed stone, which can improve the overall lateral stiffness, overturning stability, and structural integrity of the retaining wall under long-term service.

[0028] Furthermore, in practical applications, such as Figure 4 or Figure 5 As shown, the insertion protrusion 22 includes a positioning surface 221, which is in contact with the inner surface of the top plate 11 or the bottom plate 12 of the box girder. The insertion protrusion 22, in contact with one of the inner surfaces of the box girder, forms a positioning reference surface. During hoisting, as long as the insertion protrusion 22 is in contact with the preset inner surface during insertion, the concrete box girders 10 can be aligned in the arrangement direction, achieving rapid and accurate positioning of the concrete box girders 10, greatly improving assembly efficiency and precision.

[0029] Furthermore, a first flange plate 15 and a second flange plate 16 are formed extending outward from both sides of the top plate 11 of the box girder. The first flange plate 15 is located near the first web plate 13 of the box girder, and the second flange plate 16 is located near the second web plate 14 of the box girder.

[0030] like Figure 3 As shown, the first web 13 and first flange 15 of one of the adjacent concrete box girders 10, together with the second web 14 and second flange 16 of the other, form a second casting space C. Concrete is poured into the second casting space C to connect the adjacent concrete box girders 10 into a single unit. In this way, each concrete box girder 10 is no longer an independent load-bearing unit, but is connected into a whole, thereby improving the overall lateral stiffness, overturning stability, and structural integrity of the retaining wall under long-term service.

[0031] In the third specific embodiment, such as Figures 7-8 As shown, the base 21 is provided with an installation cavity 2301 with one end open. The opening is for the concrete box girder 10 to enter the installation cavity 2301, and the opening is positioned opposite to the bottom wall of the installation cavity 2301. The installation cavity 2301 is at least partially configured as the aforementioned insertion part for positioning the concrete box girder 10.

[0032] For example, refer to Figure 8An upper support platform 231 is formed protruding from the upper surface of the base 21. The upper support platform 231 has an upper mounting cavity, configured as the aforementioned mounting cavity 2301, which can be used to install and position the concrete box girder 10. Alternatively, a lower support platform 232 is formed protruding from the lower surface of the base 21. The lower support platform 232 has a lower mounting cavity, configured as the aforementioned mounting cavity 2301, which can be used to install and position the concrete box girder 10. Or, as... Figure 8 As shown, an upper support platform 231 is formed protruding from the upper surface of the base 21, and a lower support platform 232 is formed protruding from the lower surface of the base 21. The lower mounting cavity of the lower support platform 232 and the upper mounting cavity of the upper support platform 231 are connected to form the aforementioned mounting cavity 2301. The lower support platform 232 is buried underground.

[0033] The following embodiment describes the connection between the lower mounting cavity of the lower support platform 232 and the upper mounting cavity of the upper support platform 231 to form a mounting cavity 2301: The height of the upper bearing platform 231 is less than half the height of the concrete box girder 10. The height of the lower bearing platform 232 can be selected by those skilled in the art based on the actual situation, such as 1m, 1.5m, 2m, etc.

[0034] The mounting cavity 2301 can hold several concrete box girders 10 arranged in the same direction. The first web 13 of one adjacent concrete box girder 10 is close to the first web 13 of another box girder, or the first web 13 of one adjacent concrete box girder 10 is close to the second web 14 of another box girder. In this way, by splicing multiple concrete box girders 10 side by side, a continuous retaining wall is formed. The hollow cavity 101 is filled with crushed stone, which can improve the overall lateral stiffness, overturning stability and structural integrity of the retaining wall under long-term service.

[0035] Further, refer to Figures 7-8 A first pouring space exists between the concrete box girder 10 located within the mounting cavity 2301 and the sidewall of the upper mounting cavity. This space, defined as a pre-defined gap, serves as the first pouring space. Concrete is poured into this first pouring space to connect the base 21 with each concrete box girder 10 as a single unit. Simultaneously, during the hoisting of the concrete box girder 10, the first pouring space allows for a certain degree of freedom, preventing collisions with the sidewall of the upper mounting cavity.

[0036] The lower mounting cavity of the lower support platform 232 engages with the end of the concrete box girder 10 along its length. The lower mounting cavity of the lower support platform 232 restricts and constrains the horizontal position of the concrete box girder 10, allowing it to be hoisted to a preset position. This ensures that each concrete box girder 10 is aligned in the arrangement direction, achieving rapid and accurate positioning and greatly improving assembly efficiency and precision.

[0037] The first pouring space serves two purposes: firstly, it provides sufficient space for the hoisting of the concrete box girder 10, allowing for error tolerance during the hoisting process; secondly, the concrete structure within the first pouring space connects each concrete box girder 10 to the base 21, thereby improving the overall lateral stiffness, overturning stability, and structural integrity of the retaining wall under long-term service.

[0038] Furthermore, when the first web 13 of one of the adjacent concrete box girders 10 and the second web 14 of the other box girder approach each other, a first flange 15 and a second flange 16 are formed extending outward from both sides of the top plate 11 of the box girder. The first flange 15 is set close to the first web 13 of the box girder, and the second flange 16 is set close to the second web 14 of the box girder.

[0039] The first web 13 and first flange 15 of one of the adjacent concrete box girders 10, together with the second web 14 and second flange 16 of the other, form a second casting space C. Concrete is poured into this second casting space C to connect the adjacent concrete box girders 10 into a single unit. In this way, each concrete box girder 10 is no longer an independent load-bearing unit, but rather connected as a whole, thereby improving the overall lateral stiffness, overturning stability, and structural integrity of the retaining wall under long-term service.

[0040] In the second or third specific embodiment, such as Figure 1 and Figure 2 As shown, the retaining wall also includes a capping ring beam 30. The cross-sectional shape of the capping ring beam 30 is the same as that of the concrete box girder 10, and the capping ring beam 30 is cast and connected to the other end of the concrete box girder 10 in the longitudinal direction.

[0041] The capping ring beam 30 includes a first segment 31, a second segment 32, a third segment 33, and a fourth segment 34 connected end to end. The first segment 31 and the third segment 33 are arranged parallel to the top plate 11 or the bottom plate 12 of the box girder. The second segment 32 is arranged parallel to the first web plate 13 of the box girder. The fourth segment 34 is parallel to the second web plate 14 of the box girder. The second segment 32 is vertically aligned with the first web plate 13 of one of the several concrete box girders 10, and the fourth segment 34 is vertically aligned with the second web plate 14 of another of the several concrete box girders 10.

[0042] It should be noted that the capping ring beam 30 can be set in correspondence with two concrete box beams 10, three concrete box beams 10, or all concrete box beams 10, etc.

[0043] The capping ring beam 30 is cast in place. The capping ring beam 30 is connected to the concrete box beam 10 by reinforcing bars at the other end along its length, thus forming a single unit. This improves the overall bending and torsional strength of the wall when subjected to horizontal forces.

[0044] Preferably, such as Figure 1 and Figure 2 As shown, the second segment 32 is vertically aligned with the first web 13 of the outermost of several concrete box girders 10, and the fourth segment 34 is vertically aligned with the second web 14 of the other outermost of several concrete box girders 10. This arrangement of the capping ring beam 30 with all the concrete box girders 10 efficiently redistributes and transfers concentrated forces or asymmetrical earth pressures acting on the ends of the wall, preventing excessive stress concentration at the ends and thus ensuring the bending stiffness and torsional resistance of the entire retaining wall.

[0045] Furthermore, such as Figure 1 and Figure 2 As shown, the retaining wall also includes a guardrail 40. Concrete is poured into the third pouring space D formed by the capping ring beam 30 and the concrete box beam 10 at the other end along the length direction, and the guardrail 40 is connected to the capping ring beam 30 by the pouring of concrete.

[0046] Pouring concrete in the third pouring space D allows the top of the retaining wall to serve as the support surface for the guardrail 40. As retaining walls used in highway, railway, and municipal engineering projects, the guardrail 40 at the top prevents people or vehicles from falling. Simultaneously, the guardrail 40 is installed on the capping ring beam 30, and the concrete in the third pouring space D is poured concurrently, creating an inseparable integrated load-bearing system between the guardrail 40 and the main structure, thereby improving the installation strength and impact resistance of the guardrail 40.

[0047] Among them, such as Figure 2 As shown, the top plate 11 and bottom plate 12 of the box girder are provided with several drainage holes 102.

[0048] The drainage holes 102 can be arranged in a rectangular array. The diameter of the drainage holes 102 can be, but is not limited to, 50–120 mm, and the spacing between the holes can be 300–800 mm. The drainage holes 102 together form a drainage network, which effectively alleviates the buoyancy force and lateral water pressure generated by water accumulation behind the wall on the box girder components, reducing the risk of structural overturning and slippage; at the same time, it avoids the accumulation of water inside the box body, which can cause steel corrosion, concrete freeze-thaw deterioration and microbial erosion, and significantly extends the service life of the concrete box girder 10.

[0049] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A retaining wall, characterized in that, include: The prefabricated splice is a concrete box girder (10) disassembled from a simply supported beam bridge, and the concrete box girder (10) has a hollow cavity (101). The base (20) includes a seat body (21), on which a plug-in part adapted to the hollow cavity (101) is provided. The hollow cavity (101) is plugged into the plug-in part. Alternatively, the seat body (21) is provided with a plug-in part adapted to the outer contour of the concrete box beam (10), and the concrete box beam (10) is plugged into the plug-in part so that the concrete box beam (10) is fixedly connected to the seat body (21).

2. The retaining wall according to claim 1, characterized in that, The concrete box girder (10) includes a first web (13) and a second web (14) of the box girder arranged opposite to each other. Several concrete box girders (10) are arranged in the same direction, with the first web (13) of one of the adjacent concrete box girders (10) being close to each other, or the first web (13) of one of the adjacent concrete box girders (10) being close to each other.

3. The retaining wall according to claim 2, characterized in that, The concrete box girder (10) also includes a box girder top plate (11) and a box girder bottom plate (12) arranged opposite to each other. The box girder top plate (11), the box girder first web plate (13), the box girder bottom plate (12) and the box girder second web plate (14) are connected end to end in sequence to form the hollow cavity (101). The base (21) is provided with a plurality of insertion protrusions (22) arranged in the same direction. The insertion protrusions (22) are configured as the insertion part. The insertion protrusions (22) include a positioning surface (221). The positioning surface (221) is in contact with the inner surface of the top plate (11) of the box beam or the inner surface of the bottom plate (12) of the box beam.

4. The retaining wall according to claim 3, characterized in that, The cross-section of the insertion protrusion (22) gradually decreases along its extension direction, and the length of the insertion protrusion (22) is less than the length of the hollow cavity (101).

5. The retaining wall according to claim 2, characterized in that, The base (21) is provided with an installation cavity (2301) with an opening at one end, the opening being used for the concrete box girder (10) to enter the installation cavity (2301). The mounting cavity (2301) is at least partially configured as the insertion part for positioning the concrete box girder (10).

6. The retaining wall according to claim 5, characterized in that, The mounting cavity (2301) includes a lower support platform (232) located below the base (21) and an upper support platform (231) located above the base (21). The lower support platform (232) has a lower mounting cavity, and the upper support platform (231) has an upper mounting cavity. The upper mounting cavity and the lower mounting cavity communicate to form the mounting cavity (2301). The lower mounting cavity is the insertion part. There is a first pouring space between the concrete box girder (10) and the cavity sidewall of the upper mounting cavity. Concrete is poured into the first pouring space so that the seat (21) and each of the concrete box girders (10) are connected as one unit.

7. The retaining wall according to claim 2, characterized in that, It also includes a capping ring beam (30), the cross-sectional shape of which is the same as that of the concrete box girder (10). The capping ring beam (30) is cast and connected to the other end of the concrete box girder (10) along its length. The capping ring beam (30) includes a first segment (31), a second segment (32), a third segment (33), and a fourth segment (34) connected end to end in sequence. The first segment (31) is parallel to the third segment (33), the second segment (32) is parallel to the first web plate (13) of the box girder, and the fourth segment (34) is parallel to the second web plate (14) of the box girder. The second segment (32) is arranged vertically opposite to the first web (13) of one of the several concrete box girders (10), and the fourth segment (34) is arranged vertically opposite to the second web (14) of the other of the several concrete box girders (10).

8. The retaining wall according to claim 7, characterized in that, The second segment (32) is positioned vertically opposite to the first web (13) of the outermost of the several concrete box girders (10), and the fourth segment (34) is positioned vertically opposite to the second web (14) of the outermost of the several concrete box girders (10).

9. The retaining wall according to claim 7, characterized in that, Concrete is poured into the third pouring space (D) formed by the other end of the length direction of the capping ring beam (30) and the concrete box beam (10). The retaining wall also includes a guardrail (40), which is connected to the capping ring beam (30) by concrete pouring.

10. The retaining wall according to claim 2, characterized in that, When the first web (13) of one of the adjacent concrete box girders (10) and the second web (14) of the other box girder approach each other, The concrete box girder (10) also includes a box girder top plate (11) and a box girder bottom plate (12) arranged opposite to each other. The box girder top plate (11), the box girder first web plate (13), the box girder bottom plate (12) and the box girder second web plate (14) are connected end to end to form the hollow cavity (101). A first flange plate (15) and a second flange plate (16) extend outward from both sides of the box girder top plate (11). The first flange plate (15) is arranged close to the box girder first web plate (13), and the second flange plate (16) is arranged close to the box girder second web plate (14). The first web (13) and first flange (15) of one of the adjacent concrete box girders (10) form a second casting space (C) with the second web (14) and second flange (16) of the other. Concrete is poured into the second casting space (C) so that the adjacent concrete box girders (10) are connected into one.

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