Geotechnical cloth with waterproof edge and high-speed railway roadbed structure

Abstract

The utility model belongs to the field of geotechnical cloth materials, and discloses geotechnical cloth with waterproof edges and a high-speed railway roadbed structure. The geotextile with the waterproof edges comprises a geotextile layer and a waterproof layer, and the waterproof layer covers all the edges and at least part of the surface of the geotextile layer. The waterproof layers are arranged on all the edges and at least part of the surface of the geotechnical cloth layer, water is prevented from making contact with the edges of the geotechnical cloth through a gap between the track plate and the cement base layer and then being sucked into the geotechnical cloth, and the problem that the interior of the geotechnical cloth is frozen in cold seasons is solved.

Description

Technical Field

[0001] The utility model belongs to the field of geotextile materials, and more specifically relates to a geotextile with waterproof edges and a high-speed railway roadbed structure. Background Art

[0002] The structure of ballastless track is accepted by high-speed railways in various countries around the world for its high smoothness, high stability, high durability and high reliability. Ballastless track structure is also widely used in my country's high-speed railways. In order to ensure the good stability of ballastless track, it is necessary to pour a 50-80cm cement base under the track, and then build the ballastless track on the cement base. The thickness of the cement base is large, and the drying time of cement is long. If you simply wait for the cement base to dry before doing further construction, it will seriously delay the progress of the project. In order to effectively shorten the construction period, a geotextile layer is usually set between the cement base and the ballastless track. The setting of the geotextile layer enables construction workers to carry out the next step of construction when the cement base is not completely dry, and at the same time does not affect the drying of the cement base. However, the design of the geotextile layer does not simply shorten the construction period for the ballastless track. The cement base of the ballastless track is affected by thermal expansion and contraction, and the track height of the ballastless track will change slightly, which will bring certain safety hazards to high-speed trains. The geotextile layer has good elasticity. When the thickness of the cement base of the ballastless track undergoes a slight dimensional change due to thermal expansion and contraction, the geotextile layer can effectively offset the slight dimensional change of the ballastless track by relying on its own good elasticity, and maintain the good stability of the track height of the ballastless track.

[0003] The current construction process of high-speed railway subgrade is: first build a 50cm-80cm cement base, then cover it with a layer of high-strength geotextile, and finally attach the track slab. However, the existing construction method has a disadvantage, that is, due to the thick geotextile and strong lateral water absorption capacity, water can easily pass through the gap between the track slab and the cement base to contact the edge of the geotextile, and then be absorbed into the geotextile. When the weather is cold, the geotextile is very easy to freeze, so that the fiber becomes brittle, the elongation decreases, and the fabric becomes hard and no longer soft. In this way, the geotextile cannot offset the impact of the change in the size of the cement base and loses its original function. This reduces the service life and increases the cost in disguise.

[0004] Therefore, it is urgent to propose a new edge waterproof geotextile and high-speed railway subgrade structure. Utility Model Content

[0005] The purpose of the utility model is to address the deficiencies of the prior art and to propose a geotextile with waterproof edges and a high-speed railway subgrade structure. The utility model provides a waterproof layer on all edges and at least part of the surface of the geotextile layer to prevent water from passing through the gap between the track plate and the cement base and contacting the edge of the geotextile, and then being sucked into the geotextile, thereby solving the problem of ice formation inside the geotextile in cold seasons.

[0006] In order to achieve the above-mentioned purpose, the utility model provides, on one hand, a geotextile with waterproof edges, which comprises a geotextile layer and a waterproof layer, wherein the waterproof layer covers all edges and at least a part of the surface of the geotextile layer.

[0007] Preferably, the waterproof layer covers all edges of the geotextile layer and a portion of the surface extending 5-10 cm inward from the edge.

[0008] Preferably, the waterproof layer has a thickness of 0.5-1.5 mm.

[0009] Preferably, the waterproof layer is a polyurethane waterproof layer.

[0010] Preferably, the material of the geotextile layer is polypropylene spunbond filament needle-punched geotextile.

[0011] Preferably, the polypropylene spunbond filament needle-punched geotextile has a gram weight of 650-750 g / m 2 .

[0012] Preferably, the polypropylene spunbonded filament needle-punched geotextile has a thickness of 3.5-4.5 mm.

[0013] Preferably, the polypropylene spunbond filament needle-punched geotextile is a geotextile that complies with "Q / CR 658 High-speed Railway Isolation Layer Geotextile".

[0014] On the other hand, the utility model provides a high-speed railway roadbed structure, the roadbed structure includes a track plate, an edge waterproof geotextile layer and a cement base layer arranged in sequence from top to bottom;

[0015] The material of the edge waterproof geotextile layer is the above-mentioned edge waterproof geotextile.

[0016] Preferably, the thickness of the cement base layer is 50 cm-80 cm.

[0017] The beneficial effects of the technical solution of the utility model are as follows:

[0018] The utility model arranges a waterproof layer on all edges and at least part of the surface of the geotextile layer to prevent water from contacting the edge of the geotextile through the gap between the track plate and the cement base layer and then being sucked into the geotextile, thereby solving the problem of freezing inside the geotextile in cold seasons, increasing the service life of the project and reducing the project cost in disguised form.

[0019] The polypropylene spunbonded filament needle-punched geotextile of the utility model has the characteristics of high strength, equal strength in the longitudinal and transverse directions, thin thickness, good creep resistance, small friction coefficient, good wear resistance, good seismic performance, good elasticity, etc. It is more suitable for use in high-speed railways, and all technical indicators meet the requirements of "Q / CR 658 High-speed Railway Isolation Layer Geotextile".

[0020] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present invention.

[0022] Figure 1 The utility model shows a structural cross-sectional view of a geotextile with waterproof edges.

[0023] The following are the descriptions of the reference numerals:

[0024] 1. Geotextile layer; 2. Waterproof layer. DETAILED DESCRIPTION

[0025] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0026] On one hand, the utility model provides a geotextile with waterproof edges, wherein the geotextile with waterproof edges comprises a geotextile layer and a waterproof layer, wherein the waterproof layer covers all edges and at least a part of the surface of the geotextile layer.

[0027] In one example, the waterproof layer covers all edges of the geotextile layer and a portion of the surface extending 5-10 cm inward from the edge.

[0028] In one example, the waterproof layer has a thickness of 0.5-1.5 mm.

[0029] In one example, the waterproof layer is a polyurethane waterproof layer.

[0030] In one example, the material of the geotextile layer is polypropylene spunbond filament needle-punched geotextile.

[0031] In one example, the polypropylene spunbond filament needle-punched geotextile has a gram weight of 650-750 g / m 2 .

[0032] In one example, the polypropylene spunbonded filament needle-punched geotextile has a thickness of 3.5-4.5 mm.

[0033] In one example, the polypropylene spunbond filament needle-punched geotextile is a geotextile that complies with "Q / CR 658 High-speed Railway Isolation Layer Geotextile".

[0034] In the present invention, as a preferred embodiment, the polyurethane waterproof layer is sprayed on all edges and at least part of the surface of the geotextile layer. Specifically: the polypropylene spunbonded filament needle-punched geotextile passes through an automatic spraying device consisting of two rows of spray guns, and then passes through a hot air drying system to complete the spraying and drying of the polyurethane waterproof layer. In the present invention, the polypropylene spunbonded filament needle-punched geotextile is prepared by a method known to those skilled in the art.

[0035] On the other hand, the utility model provides a high-speed railway roadbed structure, the roadbed structure includes a track plate, a geotextile layer with waterproof edges, and a cement base layer arranged in sequence from top to bottom;

[0036] The material of the edge waterproof geotextile layer is the above-mentioned edge waterproof geotextile.

[0037] In one example, the thickness of the cement base layer is 50 cm-80 cm.

[0038] The present invention is specifically described below through embodiments.

[0039] Example 1

[0040] This embodiment provides a geotextile with waterproof edges, such as Figure 1 As shown, the edge waterproof geotextile includes a geotextile layer 1 and a waterproof layer 2.

[0041] The waterproof layer 2 covers all edges of the geotextile layer 1 and a portion of the surface extending 5-10 cm inward from the edge ("all edges of the geotextile layer 1 and a portion of the surface extending 5-10 cm inward from the edge" means Figure 1 The overlapping part of 1 and 2 in );

[0042] The thickness of the waterproof layer 2 is 0.5-1.5 mm; the waterproof layer 2 is a polyurethane waterproof layer.

[0043] The material of the geotextile layer 1 is polypropylene spunbonded filament needle-punched geotextile with a gram weight of 700g / m 2 The thickness is 4mm, which meets the requirements of "Q / CR 658 High-speed Railway Isolation Layer Geotextile".

[0044] This embodiment also provides a high-speed railway roadbed structure, the roadbed structure comprising a track plate, an edge waterproof geotextile layer and a cement base layer arranged in sequence from top to bottom;

[0045] The material of the edge waterproof geotextile layer is the above-mentioned edge waterproof geotextile.

[0046] The thickness of the cement base layer is 50cm-80cm.

[0047] Example 2

[0048] This embodiment provides a geotextile with waterproof edges. The difference from Embodiment 1 is that the waterproof layer covers all edges and all surfaces of the geotextile layer.

[0049] The various embodiments of the utility model have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A geotextile with waterproof edges, characterized in that: The edge-waterproof geotextile comprises a geotextile layer and a waterproof layer, wherein the waterproof layer covers all edges and at least a portion of the surface of the geotextile layer; The thickness of the waterproof layer is 0.5-1.5 mm.

2. The edge waterproof geotextile according to claim 1, characterized in that: The waterproof layer covers all edges of the geotextile layer and a portion of the surface extending 5-10 cm inward from the edge.

3. The edge waterproof geotextile according to claim 1 or 2, characterized in that: The waterproof layer is a polyurethane waterproof layer.

4. The edge waterproof geotextile according to claim 1, characterized in that: The material of the geotextile layer is polypropylene spunbonded filament needle-punched geotextile.

5. The edge waterproof geotextile according to claim 4, characterized in that: The polypropylene spunbonded filament needle-punched geotextile has a gram weight of 650-750 g / m 2 .

6. The edge waterproof geotextile according to claim 4, characterized in that: The thickness of the polypropylene spunbonded filament needle-punched geotextile is 3.5-4.5 mm.

7. A high-speed railway roadbed structure, characterized in that: The roadbed structure includes a track slab, an edge waterproof geotextile layer and a cement base layer arranged in sequence from top to bottom; The material of the edge waterproof geotextile layer is the edge waterproof geotextile described in any one of claims 1-6.

8. The high-speed railway roadbed structure according to claim 7, characterized in that: The thickness of the cement base layer is 50cm-80cm.

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