Desert road

Abstract

The utility model discloses a desert road which comprises an aeolian sand roadbed (8), a pavement structure isolation layer (7), a cement stabilized gravel base layer (6) and an asphalt concrete surface layer (5) are sequentially arranged on the aeolian sand roadbed (8), and the pavement structure isolation layer is a sodium silicate sand stabilization shell layer. The bearing capacity of the roadbed can be improved, the overall strength of the desert road is improved, meanwhile, resources can be saved, and the environment is protected.

Description

TECHNICAL FIELD

[0001] The utility model discloses a desert highway relates to road engineering field. BACKGROUND

[0002] The world's second largest desert, Taklimakan Desert, is located in Xinjiang. In order to shorten the distance between the two deserts, it is a choice to build a desert highway through the serious desertification area. The construction of the desert highway promotes the local development and injects new vitality into the economy. The construction of the road in the desertification area often needs to adapt to the local conditions, use local materials and overcome the adverse effects of wind-blown sand.

[0003] The wind-blown sand subgrade is a sand layer formed by long-term weathering and continuous transportation and accumulation under the action of wind. It has the advantages of abundant reserves, convenient material selection and strong compressive strength. The particle size of the wind-blown sand ranges from 0.001 to 0.75 mm, and the main particle size ranges from 0.075 to 0.25 mm, and a large number of them are distributed in vast desert areas.

[0004] The pavement structure isolation layer is an important part of the highway pavement structure, and its construction technology and quality directly affect the service performance, durability and safety of the highway pavement. The traditional pavement structure isolation layer includes granular cushion, slag cushion, stabilized soil cushion and geosynthetic material cushion. The common geosynthetic material cushion includes geotextile cushion or geonet cushion.

[0005] The cement stabilized gravel base is composed of gravel and cement. The broken surface of the gravel is less and the angularity is poor. In engineering practice, the cement dosage is increased and the fine gradation is used to improve the strength of the cement stabilized gravel base and reduce the segregation phenomenon. The cement dosage in engineering practice is usually 4-6%.

[0006] Asphalt concrete pavement refers to the pavement with asphalt concrete as the surface layer. The mineral aggregate with a certain gradation and a certain proportion of road asphalt material are artificially selected and mixed under strict control conditions.

[0007] Chinese patent CN 206635590 U discloses a new desert highway. The highway subgrade is provided with a sand base layer, a polypropylene textile cloth layer, a graded sand and gravel layer, a coarse-grained asphalt concrete layer and a fine-grained asphalt concrete surface layer from bottom to top. The pavement structure isolation layer adopts a polypropylene textile cloth layer. This geotextile not only has high cost, but also pollutes the environment, which is not consistent with the environmental protection concept advocated by modern society. The isolation layer using geotextile is difficult to improve the bearing capacity of the subgrade, and wrinkles are easy to appear, which is not conducive to the close connection between the bottom base layer and the subgrade.

[0008] CN 1766237A discloses a use of sodium silicate aqueous solution as a sand-fixing agent and a sand-fixing method thereof. The invention is to use sodium silicate aqueous solution as a sand-fixing agent, spray it on the surface of sand, and let the sodium silicate aqueous solution penetrate into a certain depth from the surface of sand to cement single sand grains together. After the sodium silicate solidifies, a sodium silicate sand-fixing shell layer can be formed, which can isolate the flowing sand below from the contact with wind force, thereby playing a role of sand fixation. The use of sodium silicate aqueous solution as a sand-fixing agent can slow down the spread of land desertification. Content of the utility model

[0009] The utility model discloses a desert highway, and uses sodium silicate sand-fixing shell layer as a road surface structure isolation layer to improve the bearing capacity of the roadbed and the overall strength of the desert highway, and uses wind-blown sand as raw material, which can also save resources and protect the environment.

[0010] The utility model discloses a desert highway, and uses sodium silicate sand-fixing shell layer as a road surface structure isolation layer to improve the bearing capacity of the roadbed and the overall strength of the desert highway, and uses wind-blown sand as raw material, which can also save resources and protect the environment.

[0011] A desert highway comprises a wind-blown sand roadbed, a road surface structure isolation layer, a cement stabilized gravel base layer and an asphalt concrete surface layer are sequentially arranged on the wind-blown sand roadbed, and the road surface structure isolation layer is a sodium silicate sand-fixing shell layer.

[0012] Further, the thickness of the road surface structure isolation layer is greater than 4 cm and less than 7 cm.

[0013] Further, the strength of the road surface structure isolation layer is not less than 0.3 MPa.

[0014] Further, the wind-blown sand roadbed is filled and compacted in layers.

[0015] Optionally, the road surface structure isolation layer is the sodium silicate sand-fixing shell layer described in CN 1766237A. Further, sodium silicate with a modulus of 2-3.3 is used, a sodium silicate solution is prepared according to a volume ratio of sodium silicate to water of 1:2, the sodium silicate solution is then added to a spraying device, and is uniformly sprayed onto the surface of the wind-blown sand roadbed according to a spraying amount of 0.6-0.8 L / m 2 After the end of the loosening and mixing, a scraping device is used to form a design road crown transverse slope gradient. After 12 h of natural physical and chemical reaction, a road surface structure isolation layer with a strength of not less than 0.3 MPa is formed.

[0016] Further, the road surface structure isolation layer is sequentially paved with the cement stabilized gravel base layer and the asphalt concrete surface layer after being formed.

[0017] Compared with the prior art, the utility model has the beneficial effects as follows:

[0018] 1. The road structure isolation layer in this utility model has high strength, can effectively distribute the load, improve the bearing capacity of the roadbed, and reduce road subsidence.

[0019] 2. The road structure isolation layer in this utility model uses aeolian sand as raw material, which saves costs while ensuring the road surface's durability, stability, and performance.

[0020] 3. The hardening of the road surface structure isolation layer in this utility model improves the overall strength of the desert highway. Attached Figure Description

[0021] Figure 1 This is a structural schematic diagram of a desert highway according to the present invention.

[0022] In the diagram, 1 is the highway boundary, 2 is the guardrail, 3 is the earth shoulder, 4 is the driving lane, 5 is the asphalt concrete surface layer, 6 is the cement-stabilized gravel base layer, 7 is the pavement structure isolation layer, and 8 is the aeolian sand roadbed. Detailed Implementation

[0023] The present invention will be described in detail below with reference to the embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other. Unless otherwise specified, all percentages below refer to mass percentages.

[0024] Example 1

[0025] Aeolian sand was directly used as the filling material for the aeolian sand roadbed, and it was filled and compacted in 5 layers.

[0026] Sodium silicate with a modulus of 3.0 was used, and a sodium silicate solution was prepared at a volume ratio of sodium silicate to water of 1:2. The sodium silicate solution was then added to the spraying equipment at a rate of 0.8 L / m³. 2 The spraying agent is evenly sprayed onto the surface of the aeolian sand roadbed 8, and mixed using a loosening and mixing device to a thickness of 5cm. After loosening and mixing, a leveling device is used to level and shape the surface according to the designed road camber cross slope. After 12 hours of natural physical and chemical reaction, a pavement structure isolation layer 7 with a strength of not less than 0.3MPa is formed.

[0027] After the road structure isolation layer 7 is formed, a cement-stabilized gravel base course 6 with a cement content of 5wt% and an asphalt concrete surface course 5 are laid on top in sequence.

[0028] The desert highway has a gradient of 1:4 and a cross slope of 2% in both directions.

[0029] The above-mentioned embodiments should be understood as being only for more clearly describing the present application, and should not be used to limit the scope of the present application, and after reading the present application, various equivalent modifications of the present application by those skilled in the art all fall within the scope defined by the claims attached herein.

Claims

1. A desert road comprising a wind-blown sand subgrade (8), characterised in that, On the aeolian sand subgrade (8), a pavement structure isolation layer (7), a cement stabilized gravel base (6) and an asphalt concrete surface layer (5) are sequentially arranged, wherein the pavement structure isolation layer (7) is a sodium silicate sand-fixing shell layer.

2. Desert road according to claim 1, characterized in that, The thickness of the pavement structure isolation layer (7) is greater than 4 cm and less than 7 cm.

3. The desert road according to claim 1, characterized in that, The strength of the pavement structure isolation layer (7) is not less than 0.3 Mpa.

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