Roadbed structure suitable for expansive soil
By designing the roadbed structure of the panel layer and support unit, the deformation problem caused by repeated extrusion of the road gene in the expanded soil in the expanded soil is solved, the effect of improving the bearing capacity is achieved, and the construction period and difficulty are simplified.
Patent Information
- Application Number
- CN202421173545.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-28
- Publication Date
- 2025-02-14
- Estimated Expiration
- 2034-05-28
AI Technical Summary
The roadbeds in the expansive soil area are prone to displacement, inclination and cracking due to repeated extrusion of the expansive soil under the action of the rainfall-evaporation cycle, which has severe safety problems, and the existing water barrier method has limited bearing capacity.
A roadbed structure including a panel layer and a support unit is designed. The panel layer extends along the road surface, including horizontal sections and inclined sections. A drain pipe and drain holes are provided at the bottom of the inclined section. The support unit is composed of a bearing column and a beam and is wrapped on the outside. Rubber sleeve to support the panel layer and guide rainwater toward farther areas.
By guiding rainwater to faraway areas, the moisture absorbed by the expanded soil is reduced, the deformation of the expanded soil is reduced, the bearing capacity of the roadbed is improved, the construction period and difficulty are simplified, and the strength of the panel layer is enhanced.
Smart Images
Figure CN222477131U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of concrete roadbed, in particular to a roadbed structure suitable for expansive soil. Background Art
[0002] Expansive soil is also called swelling and shrinking soil. It is a kind of highly plastic clay because it contains more clay minerals such as montmorillonite and illite. It has the characteristics of swelling when absorbing water, shrinking when losing water, repeated swelling and shrinking, and cracking. Under the action of rainfall-evaporation cycle, the roadbed built in the expansive soil area is repeatedly squeezed by the expansive soil, which can easily lead to displacement, tilting, cracking of the roadbed, deformation, bulging, settlement of the bearing plate and track on the roadbed, etc., which poses serious safety problems. Common solutions include soil replacement, soil improvement, additional foundation piles, pre-wetting expansion, and water isolation. Among them, the water isolation method has the advantages of low cost and convenient construction, but the disadvantage is that it is only applicable to shallow expansive soil and has limited bearing capacity. Utility Model Content
[0003] The utility model aims to provide a roadbed structure suitable for expansive soil with improved bearing capacity.
[0004] To achieve the above-mentioned purpose, the utility model provides a roadbed structure suitable for expansive soil, comprising: a panel layer extending along the forward direction of the road surface and a plurality of support units for supporting the panel layer, the upper surface of the panel layer is provided with a waterproof coating, the panel layer comprises a horizontal section and an inclined section located on the left and right sides of the horizontal section and inclined downward, the panel layer is provided with a plurality of drainage pipes at the lowest point of the inclined section, the plurality of drainage pipes are distributed at intervals along the extension direction of the road surface, the axial direction of the drainage pipes extends along the width direction of the road surface, rainwater is guided downward by the inclined section and collected into the drainage pipe, and rainwater flows through the drainage pipe to an area away from the panel layer, the support unit comprises a plurality of bearing columns and at least three beams located at different heights of the bearing columns, each of the beams is simultaneously connected to the same group of bearing columns, the head and tail ends of the beams are respectively connected to the inclined sections, and the beam located at the top fits the lower surface of the horizontal section.
[0005] As an improvement of the above solution, a plurality of drainage holes are provided at the bottom of the inclined section.
[0006] As an improvement of the above solution, the bottom of the inclined section is raised to form a temporary water storage tank.
[0007] As an improvement of the above solution, the outer side of the support unit is wrapped with a rubber sleeve, the thickness of the rubber sleeve is 5-10 cm, the diameter of the support unit is 0.2-0.4 m, the spacing between two adjacent upper and lower beams is 0.2-0.4 m, and the spacing between two adjacent support units is 3-5 m.
[0008] As an improvement of the above solution, the panel layer and the support unit are both cast by reinforced concrete, and the steel bars of the crossbeam are connected to the steel bars of the panel layer.
[0009] As an improvement of the above solution, a plurality of auxiliary columns and auxiliary cross bars are arranged in the area between each two adjacent support units. The auxiliary columns are arranged vertically and support the bottom of the panel layer through the auxiliary cross bars. The depth of the bottom of the auxiliary columns is shallower than the depth of the bottom of the support unit.
[0010] As an improvement of the above solution, the auxiliary columns and the auxiliary cross bars are both made of a mixture of sand and gravel, and the diameter of the auxiliary columns is 0.2-0.3m.
[0011] The utility model has the following beneficial effects: the scheme is based on the water-proof method, and the optimized panel layer can simultaneously support the road surface and guide rainwater. After the rainwater is guided, it flows to a farther area, reducing the water that the expansive soil can absorb, and naturally reducing the deformation of the expansive soil. The panel layer is laid on the expansive soil as the foundation, which greatly reduces the construction period and construction difficulty; at the same time, the panel layer is also fully supported by the support unit in three dimensions, and its own strength is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 is a cross-sectional view of a roadbed structure in a support unit region under an embodiment;
[0013] Figure 2 is a cross-sectional view of a roadbed structure in the area of auxiliary columns under an embodiment;
[0014] Figure 3 It is a side view of the roadbed structure of an embodiment.
[0015] Explanation of the reference numerals: 10, panel layer; 11, horizontal section; 12, inclined section; 21, drain pipe; 22, drain hole; 31, support unit; 32, crossbeam; 33, auxiliary column; 34, rubber sleeve. DETAILED DESCRIPTION
[0016] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "top", "bottom", "top surface", "bottom surface", "inside", "outside", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0017] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If the terms "first", "second", "third" are described, they are only used for the purpose of description and distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.
[0018] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The following is a description of the embodiments of the present invention based on its overall structure.
[0019] Reference Figures 1 to 3 The utility model discloses a roadbed structure suitable for expansive soil, comprising: a panel layer 10 extending along the forward direction of the road surface and a plurality of supporting units for supporting the panel layer 10, the upper surface of the panel layer 10 is provided with a waterproof coating, the panel layer 10 comprises a horizontal section 11 and an inclined section 12 located on the left and right sides of the horizontal section 11 and inclined downward, the panel layer 10 is provided with a plurality of drainage pipes 21 at the lowest point of the inclined section 12, the plurality of drainage pipes 21 are distributed at intervals along the extension direction of the road surface, the axial direction of the drainage pipe 21 extends along the width direction of the road surface, rainwater is guided downward by the inclined section 12 and collected into the drainage pipe 21, and the rainwater then flows through the drainage pipe 21 to an area away from the panel layer 10, it should be noted that the drainage pipe 21 is slightly inclined (the side away from the roadbed structure is at a low position). The support unit includes a plurality of load-bearing columns and at least three beams 32 located at different heights of the load-bearing columns. Each of the beams 32 is connected to the same group of the load-bearing columns at the same time. The head and tail ends of the beams 32 are respectively connected to the inclined sections 12, and the beam 32 located at the top is in contact with the lower surface of the horizontal section 11.
[0020] The solution is based on the water-proof method. The optimized panel layer 10 can support the road surface and guide rainwater at the same time. After being guided, rainwater flows to a farther area, reducing the amount of water that the expansive soil can absorb, and naturally reducing the deformation of the expansive soil. The panel layer 10 is laid on the expansive soil as the foundation, which greatly reduces the construction period and difficulty. At the same time, the panel layer 10 also receives all-round three-dimensional support from the support unit, and its own strength is guaranteed.
[0021] During construction, earthwork is excavated at intervals, and the support unit is cast first, and the end surface of the crossbeam 32 extends the steel bar so as to be subsequently connected with the steel bar of the panel layer 10. Then the panel layer 10 is cast, and finally the road surface is cast on the panel layer 10.
[0022] As an improvement of the above solution, a plurality of drainage holes 22 are provided at the bottom of the inclined section 12 for draining away part of the moisture that penetrates into the interior of the panel layer 10 .
[0023] As an improvement of the above solution, the bottom of the inclined section 12 is raised to a smaller height to form a temporary water storage tank. With the above solution, the water storage tank plays a role of temporarily collecting rainwater, which makes it more convenient for the drainage pipe 21 to drain.
[0024] As an improvement of the above solution, the outer side of the support unit 31 is wrapped with a rubber sleeve 34, the thickness of the rubber sleeve 34 is 5-10 cm, and when the expansive soil around the support unit 31 is deformed, the rubber sleeve 34 absorbs a small amount of extrusion force. The diameter of the support unit 31 is 0.2-0.4m, the spacing between the two adjacent beams 32 is 0.2-0.4m, and the spacing between two adjacent support units is 3-5m.
[0025] As an improvement of the above solution, the panel layer 10 and the support unit are both cast by reinforced concrete, and the steel bars of the crossbeam 32 are connected to the steel bars of the panel layer 10 .
[0026] As an improvement of the above solution, a plurality of auxiliary columns 33 and auxiliary cross bars are provided in the area between each two adjacent support units. The auxiliary columns 33 are vertically arranged and support the bottom of the panel layer 10 through the auxiliary cross bars. The depth of the bottom of the auxiliary columns 33 is shallower than the depth of the bottom of the support unit 31.
[0027] As an improvement of the above scheme, the auxiliary columns 33 and the auxiliary crossbars are both made of a mixture of sand and gravel, and the diameter of the auxiliary columns 33 is 0.2-0.3m. By adopting the above scheme, the rigidity of the auxiliary columns 33 is slightly reduced, and they are arranged in the shallow layer (the depth that is more severely affected by the atmosphere), which can not only meet the support effect of the panel layer 10, but also facilitate excavation and repeated pouring, and also facilitate observation and prediction of the movement trend of expansive soil, providing guidance for subsequent maintenance of the roadbed.
[0028] The foregoing description of specific exemplary embodiments of the utility model is for the purpose of illustration and illustration. These descriptions are not intended to limit the utility model to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the utility model and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the utility model and various different options and changes. The scope of the utility model is intended to be defined by the claims and their equivalents.
Claims
1. A roadbed structure suitable for expansive soil, characterized in that: include: A panel layer extending along the forward direction of a road surface and a plurality of supporting units for supporting the panel layer, the upper surface of the panel layer is provided with a waterproof coating, the panel layer includes a horizontal section and inclined sections located on the left and right sides of the horizontal section and inclined downward, the panel layer is provided with a plurality of drainage pipes at the lowest point of the inclined section, the plurality of drainage pipes are distributed at intervals along the extension direction of the road surface, the axial direction of the drainage pipes extends along the width direction of the road surface, rainwater is guided downward by the inclined sections and collected into the drainage pipes, and rainwater flows through the drainage pipes to an area away from the panel layer, the supporting unit includes a plurality of load-bearing columns and at least three beams located at different heights of the load-bearing columns, each of the beams is simultaneously connected to the same group of load-bearing columns, the head and tail ends of the beams are respectively connected to the inclined sections, and the beam located at the top fits the lower surface of the horizontal section.
2. The roadbed structure suitable for expansive soil according to claim 1, characterized in that: A plurality of drainage holes are arranged at the bottom of the inclined section.
3. The roadbed structure suitable for expansive soil according to claim 2, characterized in that: A ridge is arranged at the bottom of the inclined section to form a temporary water storage tank.
4. The roadbed structure suitable for expansive soil according to claim 3, characterized in that: The outer side of the support unit is wrapped with a rubber sleeve, the thickness of the rubber sleeve is 5-10 cm, the diameter of the support unit is 0.2-0.4 m, the spacing between two adjacent upper and lower beams is 0.2-0.4 m, and the spacing between two adjacent support units is 3-5 m.
5. The roadbed structure suitable for expansive soil according to claim 4, characterized in that: The panel layer and the support unit are both cast by reinforced concrete, and the steel bars of the crossbeam are connected to the steel bars of the panel layer.
6. The roadbed structure suitable for expansive soil according to claim 1, characterized in that: A plurality of auxiliary columns and auxiliary cross bars are arranged in the area between each two adjacent support units. The auxiliary columns are arranged vertically and support the bottom of the panel layer through the auxiliary cross bars. The depth of the bottom of the auxiliary columns is shallower than the depth of the bottom of the support units.
7. The roadbed structure suitable for expansive soil according to claim 6, characterized in that: The auxiliary columns and the auxiliary crossbars are both made of a mixture of sand and gravel, and the diameter of the auxiliary columns is 0.2-0.3m.