Soil box type gravity blocking device and construction method thereof

Abstract

The invention provides a soil box type gravity blocking device and a construction method thereof.The soil box type gravity blocking device comprises multiple sections of box type retaining wall bodies which are sequentially arranged, each box type retaining wall body is of a multi-layer box type structure, and each layer of box type structure comprises two vertical side walls, two transverse side walls and a prefabricated cross beam; a hollow body is arranged between the vertical side wall and the prefabricated cross beam, the hollow body can be filled with filler, and a solid masonry structure of a conventional gravity type retaining wall is replaced by filling the hollow body with the filler, so that the purpose of resisting the pressure of soil behind the wall by virtue of the self weight of the wall body is achieved; the construction method of the soil box type gravity blocking device comprises the steps that after device and component parameters are designed according to engineering requirements, components are prefabricated, a foundation is poured, vertical side walls and transverse side walls are poured layer by layer, and perforated stiffening plates are embedded between box type structures on each layer, and prefabricated cross beams are installed. The technical problems that a traditional gravity type retaining wall is limited in height, a large number of non-renewable resources are consumed, the construction period is long, and a novel overall assembly type retaining wall is poor in stability are solved.

Description

Technical Field

[0001] The invention relates to the technical fields of retaining structures, filling projects and road projects, and in particular to an earth box type gravity barrier device and a construction method thereof. Background Art

[0002] Retaining walls are structures that support roadbed fill or hillside soil and prevent fill or soil from deforming and becoming unstable. They are widely used in highway engineering, railway engineering, filling engineering, and municipal engineering. Common structural forms used in slope support projects include gravity retaining walls, cantilever retaining walls, buttress retaining walls, anchored retaining walls, reinforced soil retaining walls, etc. Gravity retaining walls use the retaining wall's own gravity to resist the lateral pressure of the soil behind the wall to maintain the stability of the slope. Its structure is generally made of blocks, slabs, and precast concrete blocks as masonry, or slabs of stone concrete and concrete are cast as a whole. It is widely used in slope support projects due to its simple structure, local materials, and low cost. The traditional gravity retaining wall structure is a solid structure, which consumes a lot of building materials such as block stones and concrete during the construction process, resulting in a waste of non-renewable resources. In addition, the height of the traditional gravity retaining wall is relatively small, generally 5 to 6 meters, which is not suitable for backfill projects and other high-rise slope support. From the perspective of construction, the construction period of the traditional gravity retaining wall is long, the quality of cast-in-place concrete is difficult to control during the construction process, and the long curing time of concrete affects the progress of the construction period. Affected by the terrain of the construction site, a large number of formwork construction will increase the safety risk of construction, and the structural design and construction defects of the traditional gravity retaining wall are further revealed. With the rapid development of my country's economic construction, the construction of highways, railways and high backfill projects has developed rapidly, and retaining walls are widely used in these projects. In response to the call for green development, it is imperative to optimize the retaining wall structure and construction technology to make it a new retaining wall structure with cost saving, convenient construction, resource environmental protection and wide application.

[0003] The existing patent proposes a filled concrete gravity retaining wall, which consists of a foundation, a concrete wall, a beam and a filler. The gravity retaining wall reduces the use of concrete and sand and gravel materials in terms of structural form, but its overall structure is a cast-in-place reinforced concrete structure, which does not significantly improve the simplification of construction technology and shortening of construction period. Some new gravity retaining walls adopt an integral assembled structure. Since the entire retaining wall structure is assembled, its stability and seismic resistance are relatively low, and it is easy to be damaged in actual engineering applications and earthquake disasters.

[0004] In summary, the existing gravity retaining wall technology fails to simultaneously solve the three major problems of limited retaining wall height, consumption of large amounts of building materials such as blocks and concrete, and long construction period. Summary of the invention

[0005] In view of this, the present invention proposes a soil box type gravity barrier device and a construction method thereof to solve the problems existing in the above-mentioned prior art.

[0006] On the one hand, in order to achieve the above-mentioned purpose, the present invention proposes an earth box type gravity barrier device, comprising a plurality of box-type retaining wall bodies arranged in sequence, wherein the box-type retaining wall bodies comprise a foundation, vertical side walls, transverse side walls, prefabricated cross beams, a top plate and a hollow body, and the box-type retaining wall bodies are multi-layer box-type structures, and each layer of the box-type structure comprises two vertical side walls, two transverse side walls and a plurality of prefabricated cross beams;

[0007] The foundation is set in the stratum, the vertical side walls are fixed to the upper surface of the foundation, the transverse side walls are set on both sides of the vertical side walls and connected to both ends of the vertical side walls, the prefabricated crossbeams are set between the two vertical side walls and connect the two vertical side walls, the top plate is set at the top of the vertical side walls, and the hollow body is located between the vertical side walls and the prefabricated crossbeams.

[0008] Optionally, the length of the box-type retaining wall body is 10 to 15 m, the total wall height is 15 to 20 m, the wall height of each layer of the box-type structure is 2 to 3 m, and expansion joints and settlement joints are provided between two adjacent sections of the box-type retaining wall body, and the width of the expansion joints and settlement joints is 20 to 30 mm.

[0009] Optionally, drainage holes are provided in the vertical side wall, and the drainage holes are arranged in layers along the height direction of the retaining wall, and a drainage ditch is provided below the drainage holes at the bottom layer;

[0010] The drainage holes arranged in layers are spaced 2 to 3 meters apart in the wall height direction, and are arranged in a plum blossom shape in an alternating manner, and the bottom of the drainage holes on the bottom layer is 0.3 meters higher than the ground in front of the wall toe.

[0011] Optionally, a plurality of perforated stiffening plates are arranged at intervals on the inner side of the vertical side wall, and the perforated stiffening plates are connected to the prefabricated cross beams through high-strength bolts.

[0012] Optionally, the vertical side walls and the transverse side walls are both reinforced concrete structures with a wall thickness of 0.2m to 0.25m, and the side walls include vertical steel bars, longitudinal bars, and wall tie bars. The diameter of the vertical steel bars is not less than φ22mm, the diameter of the longitudinal bars is not less than φ20mm, and the diameter of the wall tie bars is not less than φ16mm.

[0013] Optionally, the prefabricated cross beam is a steel-concrete structure, an I-shaped steel is provided in the prefabricated cross beam, and bolt holes are provided at both ends of the I-shaped steel.

[0014] Optionally, the top plate is a reinforced concrete structure, the length of the top plate is set according to the spacing between the two vertical side walls, the width is 1 to 2 m, the thickness is not less than 0.3 m, and the diameter of the steel bar is not less than φ18 mm.

[0015] Optionally, the filler filled in the hollow body is excavated soil or waste building materials.

[0016] Optionally, a geotextile is provided on the vertical side wall of the box-type retaining wall body close to the backfill soil body side of the wall, and the geotextile is vertically arranged along the outer side of the vertical side wall and penetrates several layers of vertically arranged drainage hole inlets.

[0017] On the other hand, in order to achieve the above-mentioned purpose, the present invention proposes a construction method of the above-mentioned soil box type gravity barrier device, comprising:

[0018] S1: Measure and design the slope according to the actual needs of the project, determine the design parameters of the fill slope and the relevant geometric parameters of the box retaining wall body and components;

[0019] S2: According to the geometric parameters of the relevant components of the box-type retaining wall body, the prefabricated beams, top plates and perforated stiffening plates are manufactured in the prefabrication factory;

[0020] S3: Clean the site, drain the construction site and excavate the foundation pit and soil;

[0021] S4: Lay the cushion layer in the foundation pit and support the formwork, pour the foundation, place the vertical steel bars and longitudinal bars at the designated positions, and tie the wall tie bars;

[0022] S5: Cast the vertical side wall and transverse side wall of the bottom box structure to 1.2 times the height of each box structure, and bury the perforated stiffening plate at the junction of the bottom box structure and the upper box structure;

[0023] S6: Remove the foundation formwork, lay an anti-seepage layer on the upper and side surfaces of the foundation, and backfill the foundation pit to be flush with the ground;

[0024] S7: Remove the formwork of the vertical and horizontal side walls of the bottom box structure, fill the hollow body with fillers, fill and compact step by step, and at the same time cast the vertical and horizontal side walls of the upper box structure to 1.2 times the height of each box structure, bury the perforated stiffening plate at the junction of the second and third box structures, and when the fillers are filled to the junction of the bottom box structure and the second box structure, install the prefabricated beams and fill the slope behind the wall step by step.

[0025] S8: Repeat step S7 until the filling height in the hollow body reaches the set height of the box-type retaining wall body, install the top prefabricated beams and top plate, fill the slope behind the wall layer by layer and tamp it until it is flush with the height of the top plate.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] Compared with the traditional gravity retaining wall, the retaining wall in the present invention is a box-type hollow structure. By filling materials in the hollow body to replace the solid masonry structure of the previous gravity retaining wall, the purpose of relying on the deadweight of the wall to resist the soil pressure behind the wall is achieved. The filler in the hollow body is excavated soil or waste building materials, while the traditional gravity retaining wall is mostly a sheet stone concrete structure. In comparison, the earth box type gravity retaining wall greatly reduces the use of non-renewable resources such as concrete and sheet stone. The filling material in the hollow body realizes the recycling of waste building materials and the full utilization of construction waste, solves the problem of the difficulty in handling waste building materials, and is beneficial to environmental protection. Secondly, the wall height of the earth box type gravity retaining wall in the present invention is 15 to 20 meters, which is 2 to 3 times the wall height of the traditional gravity retaining wall, which solves the problem of the height limitation of the traditional gravity retaining wall, making the new retaining wall structure suitable for filling engineering and other high-height slope support, and has a wider range of applications.

[0028] Compared with the existing filled concrete gravity retaining wall, some components of the retaining wall structure in the present invention are prefabricated components. The components can be manufactured in advance in the factory according to relevant parameters, and then assembled during the on-site construction process. This can not only simplify the construction process of the retaining wall but also reduce labor costs, and effectively save the curing time of cast-in-place concrete, which can shorten the construction period to a certain extent.

[0029] Compared with the new integral assembled retaining wall, the retaining wall structure in the present invention is a semi-assembled reinforced concrete structure, which adopts the technology of combining cast-in-place concrete with prefabricated components, and adds some cast-in-place concrete at appropriate locations, which is beneficial to the connection between cast-in-place components and prefabricated components. In addition, the semi-assembled reinforced concrete retaining wall combines the advantages of assembled structure and cast-in-place structure, avoiding the problems of weak connection, poor stability and low seismic performance of the integral assembled retaining wall.

[0030] Compared with the traditional cantilever retaining wall, the retaining wall in the present invention is a soil box structure, and its two vertical side walls are equivalent to the double-layer walls in the cantilever retaining wall, and the two vertical side walls are connected by a cross beam, so the retaining wall structure has a greater anti-overturning ability.

[0031] In the present invention, vehicles can be driven on the top plate of the retaining wall, so that the earth box gravity retaining wall can support the slope and widen the road at the same time. The wall body is a box structure, and the box hollow body is filled with layer-by-layer compacted fillers. The gravity load of the internal fillers and the vehicle load on the top plate both act on the earth box, which greatly increases the anti-overturning moment of the retaining wall. The overburden load increases the friction force at the bottom of the foundation, and the anti-slip ability of the retaining wall is enhanced, which helps to improve the overall stability of the retaining wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0033] Figure 1 It is a front view of a soil box type gravity barrier device in an embodiment of the present invention;

[0034] Figure 2 is a cross-sectional schematic diagram of a soil box type gravity barrier device in an embodiment of the present invention;

[0035] Figure 3 is a schematic diagram of connection details between the vertical side wall and the prefabricated cross beam in an embodiment of the present invention;

[0036] Figure 4 Schematic diagram of the structure of the prefabricated beam in an embodiment of the present invention.

[0037] Figure numerals: 1-foundation, 2-vertical side wall, 3-transverse side wall, 4-precast beam, 5-top plate, 6-hollow body, 7-sleeve hole, 8-drainage ditch, 9-anti-seepage layer, 10-geotextile, 11-backfill soil behind the wall, 12-stiffening plate, 13-I-beam, 14-high-strength bolt, 15-vertical steel bar, 16-longitudinal bar, 17-wall tie bar, 18-bolt hole, 19-expansion joint and settlement joint. DETAILED DESCRIPTION

[0038] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0039] In the description of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. The present invention will be described in detail below with reference to the drawings and in combination with embodiments.

[0040] This embodiment proposes a soil box type gravity barrier device and a construction method thereof, such as Figure 1As shown, it includes multiple sections of box-type retaining wall bodies arranged in sequence. The retaining wall bodies are box-type structures, and their wall bodies are cast-in-place reinforced concrete structures. The length of each section of the retaining wall body is 15 to 20 meters, and settlement joints are arranged between the multiple sections of the retaining wall.

[0041] The box-type retaining wall body includes a foundation 1, vertical side walls 2, transverse side walls 3, prefabricated cross beams 4, a top plate 5 and a hollow body 6; wherein the foundation 1 is placed in the stratum, the two vertical side walls 2 are respectively fixed on the foundation 1, the transverse side walls 3 are arranged at both ends of the vertical side walls 2, and the top plate 5 is arranged on the top of the vertical side walls 2; the retaining wall structure includes a multi-layer box structure, each layer of the box structure includes two vertical side walls 2, two transverse side walls 3, prefabricated cross beams 4 are arranged between the vertical side walls 2 to connect the vertical side walls on both sides, a hollow body 6 is arranged between the two vertical side walls 2 and the prefabricated cross beams 4, and the hollow body 6 is filled with fillers.

[0042] Drain holes 7 are provided on the vertical side walls 2 to drain the accumulated water in the soil behind the retaining wall. The drainage holes 7 penetrate the vertical side walls 2 on both sides and are arranged in layers at intervals of 2 to 3 meters along the height direction of the retaining wall. The bottom of the lowest drainage hole 7 should be 0.3 meters higher than the ground in front of the wall toe.

[0043] A geotextile 10 is arranged on the outer wall of the vertical side wall 2 close to the backfill soil 11 behind the wall. The geotextile 10 penetrates through several layers of vertically arranged drainage hole inlets to prevent the drainage holes 7 from being blocked.

[0044] The cross-sectional view of the box-type retaining wall body of the multi-layer box-type structure of this embodiment is as follows: Figure 2 As shown, the box-type structure includes vertical side walls, transverse side walls, prefabricated beams and a top plate. The bottom and common layer box-type structures include two vertical side walls and two transverse side walls. Prefabricated beams are arranged between the vertical side walls to connect the vertical side walls on both sides. The top layer box-type structure adds a top plate on the basis of the common layer.

[0045] The vertical side wall 2 is connected to the prefabricated cross beam 4 by high-strength bolts 14, and the connection details are as follows: Figure 3 shown.

[0046] The filler in the hollow body 6 is excavated soil or waste building materials, and the filler is compacted and filled in layers, with each layer thickness not greater than 0.25m and a compaction degree not less than 90%.

[0047] An expansion joint and a settlement joint are arranged between two adjacent sections of the box-type retaining wall bodies, and the width of the expansion joint and the settlement joint is 20 to 30 mm.

[0048] The earth-box type gravity barrier device provided in this embodiment combines the technical features of cantilever retaining walls and gravity retaining walls. Compared with traditional cantilever retaining walls, the side wall structure of the box-type retaining wall has greater anti-overturning ability; the gravity load of the filling material inside the box-type structure and the vehicle load on the top plate are added to the earth box, which greatly increases the anti-slip ability and anti-overturning moment of the retaining wall, and helps to improve the overall stability of the retaining wall; compared with traditional gravity retaining walls, the retaining wall height of the earth-box type gravity barrier device is large, generally 15 to 20 meters, which is more suitable for supporting fill slopes, and the filling material in the hollow body of the box-type retaining wall is excavated soil and waste building materials, which has the advantages of full utilization of resources and green environmental protection.

[0049] Embodiment 2

[0050] The present embodiment provides another implementation method of an earth-box type gravity barrier device, comprising a multi-section box-type retaining wall body arranged in sequence, wherein the retaining wall body comprises a foundation 1, vertical side walls 2, transverse side walls 3, prefabricated cross beams 4, a top plate 5 and a hollow body 6; wherein the foundation 1 is placed in the stratum, the two vertical side walls 2 are respectively fixed on the foundation 1, the transverse side walls 3 are arranged at both ends of the vertical side walls 2, and the top plate 5 is arranged on the top of the vertical side walls 2; the retaining wall structure comprises a multi-layer box-type structure, each layer of the box-type structure comprises two vertical side walls 2, two transverse side walls 3, prefabricated cross beams 4 are arranged between the vertical side walls 2 to connect the vertical side walls on both sides, a hollow body 6 is arranged between the two vertical side walls 2 and the prefabricated cross beams 4, and the hollow body 6 is filled with filler.

[0051] Furthermore, drainage holes 7 are provided on the vertical side wall 2, and the drainage holes 7 are arranged in layers along the height direction of the retaining wall.

[0052] Furthermore, a drainage ditch 8 is arranged below the bottom drainage hole 7 at a certain distance from the wall.

[0053] Furthermore, the drainage holes 7 penetrate through the vertical side walls 2 on both sides, and a geotextile 10 is arranged on the outer side of the vertical side walls 2 close to the backfill 11 behind the wall.

[0054] Furthermore, the geotextile 10 is arranged vertically along the outer side of the vertical side wall 2 structure, and penetrates several layers of vertically arranged drainage hole inlets.

[0055] Furthermore, the foundation 1 is buried in the stratum, and an anti-seepage layer 9 is laid on the upper surface and side surfaces of the foundation 1.

[0056] Furthermore, perforated stiffening plates 12 are arranged at intervals along the wall height direction on the inner side of the vertical side wall 2 .

[0057] Further, such as Figure 4As shown, the prefabricated cross beam 4 is a steel-concrete structure, and both ends of the I-shaped steel 13 in the prefabricated cross beam 4 extend out to a certain length, and bolt holes 18 are set at both ends of the I-shaped steel 13.

[0058] Furthermore, the vertical side walls 2 on both sides of the retaining wall body are connected by prefabricated cross beams 4 , and the perforated stiffening plates 12 on the inner sides of the vertical side walls 2 on both sides are connected to the prefabricated cross beams 4 by high-strength bolts 14 .

[0059] Furthermore, transverse side walls 3 are provided at both ends of the vertical side walls 2 of each section of the box-type retaining wall.

[0060] Furthermore, the filler filled in the hollow body 6 is excavated soil or waste building materials.

[0061] Furthermore, the length of the box-type retaining wall body is 10 to 15 m.

[0062] Furthermore, expansion joints and settlement joints 19 are provided between two adjacent sections of the box-type retaining wall bodies.

[0063] Furthermore, the width of the expansion joint and the settlement joint 19 is 20 to 30 mm.

[0064] Furthermore, the earth box type gravity retaining wall has a wall height of 15 to 20 m, and the wall height of each layer of the box structure is 2 to 3 m.

[0065] Furthermore, the vertical side wall 2 and the transverse side wall 3 are both reinforced concrete structures with a wall thickness of 0.2m to 0.25m. The diameter of the vertical steel bars 15 in the side wall is not less than φ22mm, the diameter of the longitudinal bars 16 is not less than φ20mm, and the diameter of the wall tie bars 17 is not less than φ16mm.

[0066] Furthermore, the prefabricated cross beam 4, the top plate 5 and the perforated stiffening plate 12 are all prefabricated components.

[0067] Furthermore, the prefabricated beam 4 is a steel-concrete structure, in which the embedded steel is Q355B I-beam. The prefabricated beam is arranged at the junction between the layers of the box-type structure, and the spacing along the wall height direction is 2 to 3m, and the spacing along the length direction is 3 to 5m.

[0068] Furthermore, the top plate 5 is a reinforced concrete structure, the length of which is determined by the distance between the two vertical side walls of the retaining wall, the width is 1 to 2 m, the thickness is not less than 0.3 m, and the diameter of the steel bar is not less than φ18 mm.

[0069] Furthermore, the drainage holes 7 are spaced 2 to 3 m apart in the wall height direction, and are arranged in a plum blossom shape in an alternating manner. The bottom of the bottom drainage hole should be 0.3 m higher than the ground in front of the wall toe.

[0070] This embodiment also provides a construction method of a soil box type gravity barrier device, the steps are as follows:

[0071] S1: According to the actual needs of the project, measure and design the slope, determine the design parameters of the fill slope, and calculate and determine the relevant geometric parameters of the retaining wall body and components;

[0072] S2: According to the geometric parameters of the retaining wall related components, the prefabricated beams 4, the top plate 5 and the perforated stiffening plate 12 are manufactured in the prefabrication factory;

[0073] S3: Clean the site, drain the construction site and excavate the foundation pit and soil;

[0074] S4: Lay a cushion layer in the foundation pit and support the formwork, pour the foundation 1, place vertical reinforcement 15 and longitudinal reinforcement 16 at the designated position, and tie the wall tie reinforcement 17;

[0075] S5: Cast the vertical side wall 2 and the transverse side wall 3 of the bottom box structure to 1.2 times the height of each box structure, and bury the perforated stiffening plate 12 at the junction of the bottom box structure and the second box structure;

[0076] S6: Remove the formwork of foundation 1, lay an anti-seepage layer 9 on the upper surface and side surface of foundation 1, and backfill the foundation pit to be flush with the ground;

[0077] S7: Remove the formwork of the vertical side wall 2 and the transverse side wall 3 of the bottom box structure, fill the filler in the hollow body 6, fill and compact step by step, and at the same time cast the vertical side wall 2 and the transverse side wall 3 of the second box structure to 1.2 times the height of each box structure, bury the perforated stiffening plate at the junction of the second box structure and the third box structure, when the filler is filled to the junction of the bottom box structure and the second box structure, install the prefabricated beam 4, and fill the slope behind the wall step by step.

[0078] S8: Repeat step 7 until the filling height in the hollow body 6 reaches the set height of the retaining wall body, install the top prefabricated beam 4 and the top plate 5, fill the slope behind the wall layer by layer and tamp it until it is flush with the top plate.

[0079] Embodiment 3

[0080] This embodiment provides a soil box type gravity barrier device, which determines the geometric parameters of the retaining wall according to the actual needs of the project, including the specific size of the retaining wall, the size of the prefabricated beam, the size of the top plate, the size of the perforated stiffening plate, etc., and completes the production of prefabricated components in a prefabrication factory;

[0081] Clean up the site, carry out foundation pit excavation and earthwork excavation on site according to the design requirements, and take relevant drainage measures; cast the foundation in the foundation pit and arrange the reinforcement of the retaining wall side wall; cast the bottom box structure and install the perforated stiffening plate; then remove the foundation formwork, lay the anti-seepage layer on the foundation surface, and backfill the foundation; then remove the formwork of the bottom box structure, fill the filler in layers inside the box structure and compact it, at the same time cast the second box structure with formwork, and install the precast beam when the filler height reaches the set position of the beam; when the filler height reaches the set height of the retaining wall body, install the top precast beam and top plate, and finally cast the top concrete and maintain it.

[0082] The main advantage of the present invention is that it overcomes the technical problems of height limitation of traditional gravity retaining walls, consumption of large amounts of non-renewable resources, lengthy construction period, and poor stability of new integrally assembled retaining walls, and provides a soil box type gravity barrier device, which can greatly reduce the use of block stones, sand and concrete materials, and realize the recycling of waste building materials. The wall height is large and the application surface is wider. The semi-assembled reinforced concrete structure can greatly shorten the construction period and overcome the defect of poor stability of the integrally assembled retaining wall. It has the advantages of being green and environmentally friendly, saving resources, being safe and stable, and being easy to construct and repair.

[0083] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-described embodiments, those skilled in the art should understand that any person skilled in the art can still modify the technical solutions described in the above-described embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or perform equivalent replacements on some of the technical features thereof; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention. They should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A soil box type gravity barrier device, characterized in that: The invention comprises a plurality of box-shaped retaining wall bodies arranged in sequence, wherein the box-shaped retaining wall bodies comprise a foundation (1), a vertical side wall (2), a transverse side wall (3), a prefabricated cross beam (4), a top plate (5) and a hollow body (6); the box-shaped retaining wall body is a multi-layer box-type structure, and each layer of the box-type structure comprises two vertical side walls (2), two transverse side walls (3) and a plurality of prefabricated cross beams (4); The foundation (1) is arranged in the stratum, the vertical side wall (2) is fixed to the upper surface of the foundation (1), the transverse side wall (3) is arranged on both sides of the vertical side wall (2) and is connected to both ends of the vertical side wall (2), the prefabricated cross beam (4) is arranged between the two vertical side walls (2) and connects the two vertical side walls (2), the top plate (5) is arranged at the top of the vertical side wall (2), and the hollow body (6) is located between the vertical side wall (2) and the prefabricated cross beam (4).

2. The soil box type gravity barrier device according to claim 1, characterized in that: The length of the box-type retaining wall body is 10-15m, the total wall height is 15-20m, the wall height of each layer of the box-type structure is 2-3m, and expansion joints and settlement joints (19) are provided between two adjacent sections of the box-type retaining wall body. The width of the expansion joints and settlement joints (19) is 20-30mm.

3. The soil box type gravity barrier device according to claim 1, characterized in that: The vertical side wall (2) is provided with drainage holes (7), the drainage holes (7) are arranged in layers along the height direction of the retaining wall, and a drainage ditch (8) is provided below the drainage holes (7) at the bottom layer; The drainage holes (7) are arranged in layers at intervals of 2 to 3 m in the wall height direction, and are arranged in a staggered manner up and down in a plum blossom shape, and the bottom of the drainage holes (7) at the bottom layer is 0.3 m higher than the ground in front of the wall toe.

4. The soil box type gravity barrier device according to claim 1, characterized in that: A plurality of perforated stiffening plates (12) are arranged at intervals inside the vertical side wall (2), and the perforated stiffening plates (12) are connected to the prefabricated cross beam (4) via high-strength bolts (14).

5. The soil box type gravity barrier device according to claim 1, characterized in that: The vertical side wall (2) and the transverse side wall (3) are both reinforced concrete structures with a wall thickness of 0.2m to 0.25m, and the side wall comprises vertical steel bars (15), longitudinal bars (16), and wall tie bars (17). The diameter of the vertical steel bars (15) is not less than φ22mm, the diameter of the longitudinal bars (16) is not less than φ20mm, and the diameter of the wall tie bars (17) is not less than φ16mm.

6. The soil box type gravity barrier device according to claim 1, characterized in that: The prefabricated cross beam (4) is a steel-concrete structure. An I-shaped steel (13) is provided in the prefabricated cross beam (4). Bolt holes (18) are provided at both ends of the I-shaped steel (13).

7. The soil box type gravity barrier device according to claim 1, characterized in that: The top plate (5) is a reinforced concrete structure. The length of the top plate (5) is set according to the spacing between the two vertical side walls (2). The width is 1 to 2 m, the thickness is not less than 0.3 m, and the diameter of the steel bars is not less than φ18 mm.

8. The soil box type gravity barrier device method according to claim 1, characterized in that: The filler filled in the hollow body (6) is excavated soil or waste building materials.

9. The soil box type gravity barrier device according to claim 1, characterized in that: A geotextile (10) is provided on the vertical side wall (2) of the box-type retaining wall body close to the backfill soil (11) behind the wall. The geotextile (10) is arranged vertically along the outer side of the vertical side wall (2) and penetrates a plurality of vertically arranged layers of drainage hole inlets.

10. A construction method of the soil box type gravity barrier device according to claims 1 to 9, characterized in that: include: S1: Measure and design the slope according to the actual needs of the project, determine the design parameters of the fill slope and the relevant geometric parameters of the box retaining wall body and components; S2: According to the geometric parameters of the relevant components of the box-type retaining wall body, the prefabricated cross beam (4), the top plate (5) and the perforated stiffening plate (12) are manufactured in the prefabrication factory; S3: Clean the site, drain the construction site and excavate the foundation pit and soil; S4: Laying a cushion layer in the foundation pit and supporting the formwork, pouring the foundation (1), placing vertical steel bars (15) and longitudinal bars (16) at designated locations, and tying wall tie bars (17); S5: Casting the vertical side wall (2) and the transverse side wall (3) of the bottom box structure to 1.2 times the height of each box structure, and burying the perforated stiffening plate (12) at the junction of the bottom box structure and the upper box structure; S6: removing the formwork of the foundation (1), laying an anti-seepage layer (9) on the upper surface and side surface of the foundation (1), and backfilling the foundation pit to be flush with the ground; S7: Remove the formwork of the vertical side wall (2) and the transverse side wall (3) of the bottom box structure, fill the hollow body (6) with filler, fill and compact step by step, and simultaneously cast the vertical side wall (2) and the transverse side wall (3) of the upper box structure to 1.2 times the height of each box structure, bury the perforated stiffening plate (12) at the junction of the second box structure and the third box structure, and when the filler is filled to the junction of the bottom box structure and the second box structure, install the prefabricated cross beam (4), and fill the back slope of the wall step by step; S8: Repeat step S7 until the filling height in the hollow body (6) reaches the set height of the box-type retaining wall body, install the top prefabricated beam (4) and the top plate (5), fill the back slope of the wall layer by layer and tamp it until it is flush with the height of the top plate (5).

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