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High-strength roadbed structure and construction method

A construction method and high-strength technology, applied in the direction of roads, roads, road repair, etc., can solve problems such as shortening the life of highways

Active Publication Date: 2020-10-23
重庆千变科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, road subgrade settlement has always been a problem, which greatly shortens the life of the road, so we improve a road structure that prolongs the life of the road

Method used

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  • High-strength roadbed structure and construction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The high-strength subgrade of the present invention is obtained by following steps of construction:

[0025] S1. Excavate and level the original foundation to ensure that the surface of the foundation is flat and the slope is uniform;

[0026] S2. Spread the undisturbed soil on the foundation in three layers. The virtual paving thickness of each layer is 22cm, 22cm, and 21 cm respectively, and measure the water content of the undisturbed soil. If the optimal water content of the mixture is 14.5% +6 The high-strength consolidating agent can be paved in the range of %~-1%. Spread the high-strength consolidating agent evenly, and use a road mixer to mix the improved soil evenly. The working speed of the road mixer should be less than 3.3 km / h, the mixing depth should not be less than 0.22m in the paving thickness, and avoid plain soil interlayers, control the water content of the improved soil during mixing, so that the improved soil can reach the optimum water content sta...

Embodiment 2

[0034] The same as the construction method of the high-strength roadbed in Example 1, the difference is that the high-strength consolidation agent includes the following raw materials in parts by weight: 82 parts of Portland cement, 38 parts of composite ultrafine powder, 9 parts of quick-setting agent, polymer 16 parts of cellulose, 24 parts of modified polypropylene, 10 parts of alkali-free glass fiber; the composite ultrafine powder is composed of slag powder, fly ash and desulfurized gypsum with a mass ratio of 30:22:15:8:18:60 , metakaolin, coal gangue and polydimethylsiloxane, the material particle size D50 is below 8μm, the particle size D95 is below 20μm, and the specific surface area is 850-900m 2 / kg;

[0035] Among them, the polymer cellulose is hydroxypropyl methylcellulose and polyvinyl alcohol fiber with a mass ratio of 5:12; the Portland cement is a mixture of sulphoaluminate cement and ordinary Portland cement Compound cement, sulfoaluminate cement accounts fo...

Embodiment 3

[0037] The same as the construction method of the high-strength subgrade in Example 1, the difference is that the high-strength consolidation agent includes the following raw materials in parts by weight: 65 parts of Portland cement, 20 parts of composite ultrafine powder, 6 parts of quick-setting agent, polymer 13 parts of cellulose, 22 parts of modified polypropylene, and 8 parts of alkali-free glass fiber; the composite ultrafine powder is composed of slag powder, fly ash, and desulfurized gypsum with a mass ratio of 22:12:12:6:15:45 , metakaolin, coal gangue and polydimethylsiloxane, the material particle size D50 is below 8μm, the particle size D95 is below 20μm, and the specific surface area is 850-900m 2 / kg;

[0038] Among them, the polymer cellulose is hydroxypropyl methylcellulose and polyvinyl alcohol fiber with a mass ratio of 5:8; the Portland cement is a mixture of sulphoaluminate cement and ordinary Portland cement Compound cement, sulfoaluminate cement account...

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Abstract

The invention relates to the field of road construction, and particularly relates to a high-strength roadbed structure and a construction method. An original foundation is excavated and leveled; an improved layer is laid, and a concrete material is poured and filled; a drainage ditch is arranged; and geotextile is laid to form a high-strength roadbed. Compared with the prior art, by using the high-strength roadbed, a structure is simple, a capillary water transportation channel between foundation soil and a foundation bed can be effectively separated; diseases of salt expansion, turning expansion, melt sinking and the like caused by a fact that saline soil erodes a cutting foundation bed structure are prevented; and compared with a traditional graded broken stone flexible base layer, the structure has higher compression resistance, bending resistance and shearing strength, the arranged geotextile and the drainage ditches on the two sides can rapidly drain water permeating into a roadbed, an influence caused by water damage is reduced, a construction process is simple, construction quality is easy to guarantee, and a high application and popularization value is possessed.

Description

technical field [0001] The invention relates to the field of road construction, in particular to a high-strength roadbed structure and a construction method. Background technique [0002] Subgrade refers to a belt-shaped structure built according to the route position and certain technical requirements as the foundation of the road surface. It is a linear structure built with soil or stone. When the roadbed is damaged by weather, hydrological conditions, human activities and geological movements, etc., it will lose the solidity, stability and durability that the roadbed should have, resulting in the need for frequent maintenance of the roadbed, which is time-consuming and labor-intensive, resulting in the loss of human resources. Waste increases the capital expenditure of roadbed maintenance, hinders traffic and use, and the stability of roadbed is directly related to whether roads and railways can be used normally. According to the existing technology, the roadbed is expos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01C3/00E01C3/04E01C21/00E01C19/48C08F255/02C04B28/04C04B14/42
CPCE01C3/00E01C3/04E01C21/00E01C19/4806C08F255/02C04B28/04C04B14/42C04B2201/50C04B18/141C04B18/08C04B22/145C04B14/106C04B18/12C04B24/42C04B22/0093C04B22/10C04B22/064C04B24/383C04B16/0641C04B24/2611
Inventor 赖文友郑小军周斌
Owner 重庆千变科技有限公司
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