Green land-saving composite roadbed structure

Abstract

The utility model discloses a kind of green land-saving type composite roadbed structures, including old roadbed and new roadbed, new roadbed is spliced in the side of old roadbed, new roadbed includes retaining wall type retaining wall, bubble light soil layer located above retaining wall type retaining wall and pavement layer laid above bubble light soil layer, retaining wall type retaining wall is set on the slope of old roadbed, and gravel soil layer is backfilled between the back of retaining wall type retaining wall and the slope of old roadbed.The utility model is aimed at the roadbed height greater roadbed extension widening construction, retaining wall type retaining wall and bubble light soil layer are set on the slope of old roadbed, new roadbed does not need to increase land, old roadbed is basically in stable state, at the same time, the bearing capacity requirement of new roadbed setting retaining wall type retaining wall to old roadbed is low, the static load of old roadbed is smaller, does not affect existing roadbed stability.The utility model does not set up slope, does not newly increase highway land, and construction is simple and fast, and construction efficiency is high.

Description

Technical Field

[0001] This utility model relates to the field of highway reconstruction and expansion technology, and in particular to a green and land-saving composite roadbed structure. Background Technology

[0002] In common highway reconstruction and expansion projects, it is necessary to construct a new roadbed outside the old roadbed. Since the road surface of a highway is generally higher than the ground, if a normal slope protection scheme is adopted for the roadbed slope, many highways require a large amount of land. For roadbeds with a small fill height, in order to save land, a single method such as aerated lightweight soil or buttress retaining walls is often used to widen the new and old roadbeds. For roadbeds with a large height, since they are located on high slopes, a large amount of backfill soil is required and a lot of land is occupied.

[0003] Therefore, for roadbed expansion projects with large roadbed heights, there is an urgent need for a new type of green and land-saving composite roadbed structure. Utility Model Content

[0004] The purpose of this utility model is to provide a green and land-saving composite roadbed structure. For roadbed expansion and widening construction with a large roadbed height, a buttress retaining wall and a layer of aerated lightweight soil are set on the slope of the old roadbed. The new roadbed does not require additional land, and the old roadbed is basically in a stable state. At the same time, the buttress retaining wall on the new roadbed has low requirements on the bearing capacity of the old roadbed. The composite roadbed widening splicing structure scheme of filling the buttress retaining wall with aerated lightweight soil has a small static load on the old roadbed and does not affect the stability of the existing roadbed, thus effectively solving the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A green and land-saving composite roadbed structure includes an old roadbed and a new roadbed. The new roadbed is spliced ​​to one side of the old roadbed. The new roadbed includes a buttress retaining wall, a layer of aerated lightweight soil above the buttress retaining wall, and a pavement layer laid on top of the aerated lightweight soil layer. The buttress retaining wall is set on the slope of the old roadbed, and a layer of crushed stone soil is backfilled between the abutment of the buttress retaining wall and the slope of the old roadbed.

[0007] Furthermore, the old roadbed and the new roadbed are joined by a stepped structure.

[0008] Furthermore, the transverse slope of the stepped structure located between the bubble-bubble lightweight soil layer and the old roadbed is 1:1.

[0009] Furthermore, the bottom of the new roadbed is supported by sheet piles, which are located between the buttress retaining wall and the old roadbed.

[0010] Furthermore, the slope of the old roadbed is equipped with several grouting steel pipes located below the buttress retaining wall, and the top of the grouting steel pipes is connected to the foundation of the buttress retaining wall.

[0011] Furthermore, a reinforced concrete slab is provided on top of the crushed stone soil layer.

[0012] Furthermore, the thickness of the reinforced concrete slab is set to 20cm to 40cm.

[0013] Furthermore, the bubble-filled lightweight soil layer is poured in layers on top of the reinforced concrete slab.

[0014] Furthermore, the height of the bubble-bubbled lightweight soil layer is set to 2m to 10m.

[0015] Furthermore, the height of the buttress retaining wall is set to 2m to 10m.

[0016] Compared with the prior art, this utility model provides a green and land-saving composite roadbed structure, which has the following beneficial effects:

[0017] This utility model addresses the widening and expansion of roadbeds with significant height. It employs a method of placing buttress retaining walls and a layer of aerated lightweight soil on the slope of the old roadbed. The new roadbed does not require additional land, and the old roadbed remains essentially stable. Furthermore, the buttress retaining walls placed low demands on the bearing capacity of the old roadbed, and the composite widening roadbed splicing structure of filling the buttress retaining walls with aerated lightweight soil results in a smaller static load on the old roadbed, without affecting its stability.

[0018] This utility model does not require slope protection, does not require additional land for highway construction, and is simple, quick, and efficient to construct. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of this utility model.

[0021] Attached reference numerals: 1. Old roadbed; 2. New roadbed; 21. Buttress retaining wall; 22. Aerated lightweight soil layer; 23. Pavement layer; 24. Crushed stone soil layer; 25. Steel sheet pile support; 26. Grouting steel pipe; 27. Reinforced concrete slab; 3. Step structure. Detailed Implementation

[0022] The technical solution of this utility model will be clearly and completely described below through detailed embodiments and in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0023] Please refer to Figure 1 For roadbed widening and expansion construction with a large roadbed height, this embodiment provides a green and land-saving composite roadbed structure, including an old roadbed 1 and a new roadbed 2. The new roadbed 2 is spliced ​​to one side of the old roadbed 1. The new roadbed 2 includes a buttress retaining wall 21, an aerated lightweight soil layer 22 located above the buttress retaining wall 21, and a pavement layer 23 laid on top of the aerated lightweight soil layer 22. The buttress retaining wall 21 is set on the slope of the old roadbed 1, and a crushed stone soil layer 24 is backfilled between the abutment of the buttress retaining wall 21 and the slope of the old roadbed 1. Because the new roadbed uses buttress retaining walls and aerated lightweight soil layers on the slopes of the old roadbed, no additional land is needed for the new roadbed, and the old roadbed remains basically stable. At the same time, the buttress retaining walls on the new roadbed place low demands on the bearing capacity of the old roadbed, and the composite roadbed widening and splicing structure scheme of filling aerated lightweight soil on the buttress retaining walls results in a small static load on the old roadbed, without affecting the stability of the existing roadbed.

[0024] In some specific implementation methods, such as Figure 1 As shown, the bottom of the new roadbed 2 is supported by sheet piles 25, which are located between the buttress retaining wall 21 and the old roadbed 1. Sheet pile support is constructed on the old roadbed, followed by excavation of the foundation pit and pouring of the buttress retaining wall. Specifically, as an example, the height of the sheet pile support is 9m.

[0025] In some specific implementation methods, such as Figure 1 As shown, the slope of the old roadbed 1 is equipped with several grouting steel pipes 26 located below the buttress retaining wall 21, and the top of the grouting steel pipes 26 is connected to the foundation of the buttress retaining wall 21. By constructing and installing the grouting steel pipes, the foundation bearing capacity of the buttress retaining wall can be improved.

[0026] As an improved implementation method, such as Figure 1 As shown, the old roadbed 1 and the new roadbed 2 are joined by a stepped structure 3. The old roadbed is stepped at the joint, which makes the connection surface at the joint between the old and new roadbeds larger, ensuring the quality of the roadbed joint. No significant settlement will occur at the junction of the new and old roadbeds, thus effectively avoiding the height difference at the junction of the new and old roadbeds.

[0027] Specifically, as an example, the transverse slope of the stepped structure 3 located between the bubble-bubble lightweight soil layer 22 and the old roadbed 1 is 1:1.

[0028] To prevent rainwater from seeping into the gravelly soil layer, and to increase the pressure of the gravelly soil backfilled into the buttress retaining wall, as an improved implementation method, such as... Figure 1 As shown, a reinforced concrete slab 27 is provided on top of the gravel soil layer 24.

[0029] In some specific embodiments, the thickness of the reinforced concrete slab 27 is set to 20cm to 40cm. Specifically, as an example, the reinforced concrete slab 27 is cast using C30 concrete, and the thickness of the reinforced concrete slab 27 is set to 30cm.

[0030] In some specific implementation methods, such as Figure 1 As shown, the bubble-bubble lightweight soil layer 22 is poured in layers above the reinforced concrete slab 27. The height of the bubble-bubble lightweight soil layer 22 is set to 2m to 10m. Specifically, as an example, the height of the bubble-bubble lightweight soil layer 22 is set to 8m.

[0031] In some specific embodiments, the height of the buttress retaining wall 21 is set to 2m to 10m. Specifically, as an example, the height of the buttress retaining wall 21 is set to 8m, and the buttress retaining wall 21 is made of C30 concrete.

[0032] refer to Figure 1 During construction, sheet pile support 25 is constructed on the slope of the old roadbed 1, foundation pit is excavated and grouting steel pipe 26 is constructed, and the foundation of the buttress retaining wall 21 is poured. A stepped structure 3 is constructed at the slope splicing point of the old roadbed 1. Then, the buttress retaining wall 21 is constructed, and a layer of crushed stone soil 24 is backfilled between the back of the buttress retaining wall 21 and the slope of the old roadbed 1. A reinforced concrete slab 27 is then poured on the crushed stone soil layer 24. After that, a layer of aerated lightweight soil 22 is poured in stages and layers on the reinforced concrete slab 27. After the aerated lightweight soil layer 22 is completed, the pavement layer 23 is constructed, and the splicing of the new roadbed 2 and the old roadbed 1 is completed.

[0033] The above embodiments are merely illustrative of the concept and technical solution of this utility model, and are not intended to limit this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

[0034] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A green land-saving composite roadbed structure comprising an old roadbed and a new roadbed, characterized in that, The new roadbed is spliced ​​to one side of the old roadbed. The new roadbed includes a buttress retaining wall, a layer of aerated lightweight soil above the buttress retaining wall, and a pavement layer laid on top of the aerated lightweight soil layer. The buttress retaining wall is set on the slope of the old roadbed, and a layer of crushed stone soil is backfilled between the abutment of the buttress retaining wall and the slope of the old roadbed.

2. The green land-saving composite roadbed structure according to claim 1, characterized in that, The old roadbed and the new roadbed are joined by a stepped structure.

3. The green land-saving composite roadbed structure according to claim 2, characterized in that, The transverse slope of the stepped structure located between the bubble-bubble lightweight soil layer and the old roadbed is 1:

1.

4. The green and land-saving composite roadbed structure according to claim 1, characterized in that, The bottom of the new roadbed is supported by sheet piles, which are located between the buttress retaining wall and the old roadbed.

5. The green and land-saving composite roadbed structure according to claim 1, characterized in that, The slope of the old roadbed is equipped with several grouting steel pipes located below the buttress retaining wall, and the top of the grouting steel pipes is connected to the foundation of the buttress retaining wall.

6. The green and land-saving composite roadbed structure according to claim 1, characterized in that, A reinforced concrete slab is installed on top of the gravelly soil layer.

7. The green and land-saving composite roadbed structure according to claim 6, characterized in that, The thickness of the reinforced concrete slab is set to 20cm to 40cm.

8. The green and land-saving composite roadbed structure according to claim 6, characterized in that, The bubble-filled lightweight soil layer is poured in layers on top of the reinforced concrete slab.

9. The green and land-saving composite roadbed structure according to claim 1, characterized in that, The height of the bubble-bubbled lightweight soil layer is set to 2m to 10m.

10. The green and land-saving composite roadbed structure according to claim 1, characterized in that, The height of the buttress retaining wall is set to 2m to 10m.

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