Light soil retaining wall roadbed splicing structure

Abstract

The utility model discloses a light soil retaining wall roadbed splicing structure, and belongs to the technical field of road construction. The structure comprises the old roadbed, excavation steps are arranged on a side slope of the old roadbed, a water permeable cushion layer is arranged on the step face, with the lowest elevation, of the excavation steps, and an outer retaining wall is arranged on the water permeable cushion layer. A light soil retaining wall, a waterproof assembly and a pavement structure layer are sequentially arranged in a space defined by the excavation step, the permeable cushion layer and the outer retaining wall from bottom to top. The waterproof assembly is arranged between the light soil retaining wall and the pavement structure layer, water on the pavement structure layer is prevented from seeping into the light soil retaining wall, meanwhile, the water permeable cushion layer is arranged at the bottom of the light soil retaining wall so that the water seeping into the bottom of the light soil retaining wall can be drained in time through the water permeable cushion layer, and it is ensured that the roadbed is kept stable.

Description

Technical Field

[0001] The utility model relates to a lightweight soil retaining wall roadbed splicing structure, belonging to the technical field of road construction. Background Art

[0002] After the road is widened, the settlement of the new and old roadbeds at the junction is different, resulting in a certain settlement difference. In particular, under the action of the deadweight load of the new roadbed pavement and the vehicle load, the settlement of the new foundation will be much higher than that of the old foundation, while the old roadbed has completed a considerable post-construction settlement. This will inevitably produce a sudden change point of settlement difference at the junction. The differential settlement of the new and old foundations will be mapped to the road surface, increasing the road cross-section slope change rate. In severe cases, longitudinal cracks in the road surface or even roadbed instability will occur, threatening driving comfort and safety.

[0003] To this end, Chinese patent document CN114232402A discloses a roadbed filling method for road reconstruction and expansion in restricted road sections. This method is particularly suitable for roadbed filling in road reconstruction and expansion projects when the road width is limited. Since the bubble-mixed lightweight soil has an extremely small bulk density and most of it is lighter than water, it greatly reduces the load near the foundation and reduces the difficulty of treating the original foundation.

[0004] However, this method involves laying HDPE anti-seepage geotextile on the bottom foundation of the pouring area, which results in the water seeping into the roadbed not being discharged in time, and is not conducive to maintaining the stability of the roadbed. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a lightweight soil retaining wall roadbed splicing structure.

[0006] The utility model is achieved through the following technical solutions:

[0007] A lightweight earth retaining wall roadbed splicing structure includes an old roadbed, an excavation step is provided on the slope of the old roadbed, a permeable cushion layer is provided on the step surface with the lowest elevation on the excavation step, an outer retaining wall is provided on the permeable cushion layer, and a lightweight earth retaining wall, a waterproof component and a pavement structure layer are provided in sequence from bottom to top in the space enclosed by the excavation step, the permeable cushion layer and the outer retaining wall.

[0008] The permeable cushion layer comprises a crushed stone cushion layer and a permeable geotextile arranged on the crushed stone cushion layer.

[0009] A concrete slope protection layer is provided on the surface of the permeable cushion layer, and the concrete slope protection layer is located on a side of the outer retaining wall away from the excavation step.

[0010] The outer retaining wall comprises a concrete base and a prefabricated concrete panel wall arranged on the concrete base.

[0011] The surface of the excavated steps is sprayed with a C20 concrete protective layer.

[0012] The lightweight soil retaining wall is a bubble mixed lightweight soil retaining wall.

[0013] Multiple layers of steel wire mesh are arranged at equal intervals from bottom to top in the lightweight earth retaining wall.

[0014] The spacing between the multiple layers of steel wire mesh in the lightweight soil retaining wall is 50 cm, and the mesh size of the steel wire mesh is 10 cm x 10 cm.

[0015] A gravel blind ditch is provided on one side of the old roadbed close to the excavation step. The gravel blind ditch is arranged longitudinally along the old roadbed and at the same elevation as the waterproof component.

[0016] The waterproof component comprises a waterproof geomembrane and a reinforced concrete layer arranged on the waterproof geomembrane.

[0017] A reinforced concrete foundation is provided on the reinforced concrete layer at an edge away from the gravel blind ditch, and a shoulder is provided on the reinforced concrete foundation. The reinforced concrete foundation is located in the pavement structure layer, and a drainage pipe B is provided at the bottom of the reinforced concrete foundation along the transverse direction of the old roadbed. The shoulder is partially located in the pavement structure layer and partially extends to above the pavement structure layer. A drainage pipe A is provided on the upper side of the pavement structure layer in the shoulder, and one end of the drainage pipe A away from the pavement structure layer extends to the slope outside the outer retaining wall.

[0018] The beneficial effect of the present invention is that a waterproof component is set between the lightweight earth retaining wall and the pavement structure layer to prevent water on the pavement structure layer from seeping into the lightweight earth retaining wall. At the same time, a permeable cushion layer is set at the bottom of the lightweight earth retaining wall so that water that has seeped into the bottom of the lightweight earth retaining wall can be discharged in time through the permeable cushion layer to ensure that the roadbed remains stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural diagram of the present utility model.

[0020] In the figure: 1- old roadbed, 2- gravel blind ditch, 3- pavement structure layer, 4- waterproof geomembrane, 5- steel wire mesh, 6- reinforced concrete layer, 7- shoulder, 8- drain pipe A, 9- reinforced concrete foundation, 10- drain pipe B, 11- precast concrete panel wall, 12- lightweight earth retaining wall, 13- concrete slope protection layer, 14- concrete base, 15- gravel cushion layer, 16- excavation step, 17- permeable geotextile. DETAILED DESCRIPTION

[0021] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the described solution.

[0022] like Figure 1As shown, the utility model discloses a lightweight earth retaining wall roadbed splicing structure, comprising an old roadbed 1, an excavation step 16 provided on the side slope of the old roadbed 1, a permeable cushion layer provided on the lowest step surface of the excavation step 16, an outer retaining wall provided on the permeable cushion layer, and a lightweight earth retaining wall 12, a waterproof assembly, and a pavement structure layer 3 provided in sequence from bottom to top in the space enclosed by the excavation step 16, the permeable cushion layer, and the outer retaining wall. When in use, a new roadbed is formed by filling the space enclosed by the excavation step 16, the permeable cushion layer, and the outer retaining wall with the lightweight earth retaining wall 12. By utilizing the lightweight characteristics of the lightweight earth retaining wall 12, the load of the new roadbed on the excavation step 16 can be effectively reduced, thereby reducing roadbed settlement and preventing road cracking that affects driving safety. A waterproof component is set between the lightweight soil retaining wall 12 and the pavement structure layer 3 to prevent water on the pavement structure layer 3 from seeping into the lightweight soil retaining wall 12. At the same time, a permeable cushion layer is set at the bottom of the lightweight soil retaining wall 12 so that water that has seeped into the bottom of the lightweight soil retaining wall 12 can be discharged in time through the permeable cushion layer to ensure that the roadbed remains stable.

[0023] The permeable cushion layer includes a crushed stone cushion layer 15 and a permeable geotextile 17 arranged on the crushed stone cushion layer 15 .

[0024] The surface of the permeable cushion is provided with a concrete slope protection layer 13, and the concrete slope protection layer 13 is located on the side of the outer retaining wall away from the excavation step 16. The concrete slope protection layer 13 provides protection for the permeable geotextile 17 and the crushed stone cushion layer 15. The concrete slope protection layer 13 does not completely cover the slope of the crushed stone cushion layer 15, ensuring that water that seeps into the bottom of the lightweight earth retaining wall 12 can be discharged promptly through the crushed stone cushion layer 15.

[0025] The outer retaining wall includes a concrete base 14 and a prefabricated concrete panel wall 11 arranged on the concrete base 14 .

[0026] The surface of the excavated step 16 is sprayed with a C20 concrete protective layer.

[0027] The lightweight soil retaining wall 12 is a bubble mixed lightweight soil retaining wall.

[0028] Multiple layers of steel mesh 5 are arranged at equal intervals from bottom to top in the lightweight earth retaining wall 12 .

[0029] The spacing between the multiple layers of steel mesh 5 in the lightweight earth retaining wall 12 is 50 cm, and the mesh size of the steel mesh 5 is 10 cm x 10 cm.

[0030] A gravel blind ditch 2 is provided on one side of the old roadbed 1 near the excavation step 16. The gravel blind ditch 2 is arranged longitudinally along the old roadbed 1 and at the same elevation as the waterproof component.

[0031] The waterproof assembly includes a waterproof geomembrane 4 and a reinforced concrete layer 6 arranged on the waterproof geomembrane 4.

[0032] A reinforced concrete foundation 9 is provided on the reinforced concrete layer 6 at an edge away from the gravel blind ditch 2, and a shoulder 7 is provided on the reinforced concrete foundation 9. The reinforced concrete foundation 9 is located within the pavement structure layer 3, and a drainage pipe B10 is provided at the bottom of the reinforced concrete foundation 9 along the transverse direction of the old roadbed 1. The shoulder 7 is partially located within the pavement structure layer 3 and partially extends above the pavement structure layer 3. A drainage pipe A8 is provided on the upper side of the pavement structure layer 3 within the shoulder 7, and the end of the drainage pipe A8 away from the pavement structure layer 3 extends to the slope outside the outer retaining wall. Water accumulated on the road surface is drained through the drainage pipe A8, and water that has seeped into the reinforced concrete layer 6 is drained through the drainage pipe B10.

Claims

1. A lightweight soil retaining wall roadbed splicing structure, characterized by: The invention comprises an old roadbed (1), wherein an excavation step (16) is provided on the side slope of the old roadbed (1), a permeable cushion layer is provided on the lowest step surface of the excavation step (16), an outer retaining wall is provided on the permeable cushion layer, and a lightweight earth retaining wall (12), a waterproof component and a pavement structure layer (3) are provided in sequence from bottom to top in the space enclosed by the excavation step (16), the permeable cushion layer and the outer retaining wall.

2. The lightweight soil retaining wall roadbed splicing structure according to claim 1, characterized in that: The permeable cushion layer comprises a crushed stone cushion layer (15) and a permeable geotextile (17) arranged on the crushed stone cushion layer (15).

3. The lightweight soil retaining wall roadbed splicing structure according to claim 1, characterized in that: A concrete slope protection layer (13) is provided on the surface of the permeable cushion layer, and the concrete slope protection layer (13) is located on a side of the outer retaining wall away from the excavation step (16).

4. The lightweight soil retaining wall roadbed splicing structure according to claim 1, characterized in that: The outer retaining wall comprises a concrete base (14) and a prefabricated concrete panel wall (11) arranged on the concrete base (14).

5. The lightweight soil retaining wall roadbed splicing structure according to claim 1, characterized in that: The surface of the excavation step (16) is sprayed with a C20 concrete protective layer.

6. The lightweight soil retaining wall roadbed splicing structure according to claim 1, characterized in that: The lightweight soil retaining wall (12) is a bubble mixed lightweight soil retaining wall.

7. The lightweight soil retaining wall roadbed splicing structure according to claim 1, characterized in that: Multiple layers of steel wire mesh (5) are arranged at equal intervals from bottom to top in the lightweight earth retaining wall (12).

8. The lightweight soil retaining wall roadbed splicing structure according to claim 7, characterized in that: The spacing between the multiple layers of steel mesh (5) in the lightweight earth retaining wall (12) is 50 cm, and the mesh size of the steel mesh (5) is 10 cm x 10 cm.

9. The lightweight soil retaining wall roadbed splicing structure according to claim 1, characterized in that: A gravel blind ditch (2) is provided on one side of the old roadbed (1) near the excavation step (16), and the gravel blind ditch (2) is arranged longitudinally along the old roadbed (1) and at the same elevation as the waterproof component; The waterproof component comprises a waterproof geomembrane (4) and a reinforced concrete layer (6) provided on the waterproof geomembrane (4).

10. The lightweight soil retaining wall roadbed splicing structure according to claim 9, characterized in that: A reinforced concrete foundation (9) is provided on the reinforced concrete layer (6) at an edge away from the gravel blind ditch (2), and a shoulder (7) is provided on the reinforced concrete foundation (9). The reinforced concrete foundation (9) is located in the pavement structure layer (3), and a drainage pipe B (10) is provided at the bottom of the reinforced concrete foundation (9) along the transverse direction of the old roadbed (1). The shoulder (7) is partially located in the pavement structure layer (3) and partially extends above the pavement structure layer (3). A drainage pipe A (8) is provided on the upper side of the pavement structure layer (3) in the shoulder (7), and one end of the drainage pipe A (8) away from the pavement structure layer (3) extends to the slope outside the outer retaining wall.

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