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Highway widened roadbed structure and construction method thereof

A technology for highways and construction methods, applied in the direction of roads, roads, road repairs, etc., can solve the problems of difficult skeleton manufacturing, low reliability, and poor mechanical properties, and achieve simple structure, increased mechanical properties, and low production costs Effect

Active Publication Date: 2019-02-01
广东云津工程建设有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the problems that the existing technology has not solved the defects of poor mechanical properties such as shear resistance, bending resistance and fatigue resistance of the graded crushed stone layer, the reliability is not high, and the skeleton used is difficult to be popularized on a large scale due to manufacturing difficulties. The invention provides a highway widening subgrade structure and its construction method. A special skeleton is added to the graded crushed stone layer of the widened road surface and arranged in a specific way, which can effectively improve the mechanical properties of the graded crushed stone layer. , thereby reducing damage such as reflection cracks when the widened roadbed is in service; moreover, this kind of skeleton is simple to manufacture, high in reliability, and low in production cost, and is suitable for large-scale promotion

Method used

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  • Highway widened roadbed structure and construction method thereof
  • Highway widened roadbed structure and construction method thereof
  • Highway widened roadbed structure and construction method thereof

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Effect test

Embodiment 1

[0040] Such as figure 1 As shown, a highway widening subgrade structure includes a semi-rigid old road and an expanded new road on the side of the old road. The semi-rigid old road includes an upper asphalt surface layer 1, a middle asphalt surface layer 2, and a lower asphalt surface layer 3, from top to bottom. Semi-rigid material upper base 4, semi-rigid material lower base 5, and semi-rigid material sub-base 6; from top to bottom, the structural layers corresponding to the expanded new road and the semi-rigid old road are asphalt surface layer 7, asphalt middle surface layer 8, Asphalt lower layer 9, graded crushed stone layer 10, lower semi-rigid material base 11 and bottom semi-rigid material base 12; wherein, the bottom elevation of the graded crushed stone layer 10 is 5-5% lower than the bottom elevation of the corresponding old road structure layer 10cm; the skeleton 13 is laid in the graded crushed stone layer 10, the skeleton 13 is a circular or polygonal frame stru...

Embodiment 2

[0044] Since the framework adopted is a closed frame structure, although the mechanical properties of the graded crushed stone layer 10 can be improved, and it has the advantages of simple manufacture, low production cost, and high reliability; Laying will greatly increase the construction cost and affect the construction efficiency; and no device for laying the above-mentioned skeleton has been found at present. In order to solve this technical problem, this embodiment discloses a construction device for widening the roadbed of the expressway, such as Figure 4-9 As shown, it includes a base 14 and a material storage device 16. The material storage device 16 includes a main rod 1601, a telescopic rod 1602 and a connecting rod 1603; the base 14 is used as a support carrier, and a riser 1401 is provided on it; The top of the vertical plate 1401 is fixed on the top plate protruding obliquely upwards, so that the angle between the main rod 1601 and the bottom surface is between 45...

Embodiment 3

[0049] A kind of construction method of expressway widening subgrade described in embodiment 1, the following is the specific construction description to expressway widening subgrade: milling out splicing steps on semi-rigid old road, laying each structural layer of expanding new road successively , where the laying steps of the graded crushed stone layer are:

[0050] A. The graded crushed stone layer 10 is paved, shaped, and rolled several times. Before each paving, the skeleton 13 is laid in advance. The thickness of the graded crushed stone layer 10 laid each time is 5-15 cm.

[0051] B. The bottom elevation of the graded crushed stone layer 10 is 5-10cm lower than the bottom elevation of the corresponding old road structure layer.

[0052] The bottom elevation of the graded crushed stone layer 10 is lower than the bottom elevation of the corresponding old road structure layer, which is conducive to the discharge of water in the old road structure layer through the crushed...

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Abstract

The invention discloses a highway widened roadbed structure and a construction method thereof and belongs to the technical field of road engineering. From top to bottom, structural layers, corresponding to a semi-rigid old highway, of a widened new highway are an asphalt surface course, an asphalt middle surface course, an asphalt lower surface course, a graded broken stone course, a lower semi-rigid material base course and a bottom semi-rigid material base course in sequence, wherein frameworks are laid in the graded broken stone course; the frameworks are of circular ring-shaped or polygonal frame body structures; multiple layers of frameworks are laid; and the framework in each layer and the framework in an adjacent layer are partially staggered from each other. According to the highway widened roadbed structure, the mechanical property of the graded broken stone course can be effectively improved so that damages, such as reflection cracks, of the widened roadbed in service are reduced; and moreover, the highway widened roadbed structure has the advantages that the making is simple, the production cost is lower, the highway widened roadbed structure is suitable for large-scalepopularization and so on.

Description

technical field [0001] The invention belongs to the technical field of road engineering, and more specifically relates to an expressway widening subgrade structure and a construction method thereof. Background technique [0002] my country began to build high-grade highways represented by expressways in the mid-1980s, including rigid pavement and semi-rigid pavement. Among the highways that have been built, 95% are pavements with semi-rigid materials as the base layer and asphalt concrete as the surface layer. The semi-rigid base has high strength and bearing capacity, good overall stability and durability. As people's material living standards are getting higher and higher, and there are more and more self-driving cars, in order to meet the needs of traffic growth, it is necessary to widen and rebuild existing expressways. In reconstruction and expansion projects, some road sections with better road conditions are usually treated with simple disease, and the original stru...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01C3/00E01C3/04E01C21/00E01C19/52
CPCE01C3/00E01C3/006E01C3/04E01C19/522E01C21/00
Inventor 武钦培闫淑华封艳琴杨祎阎世龙张斌李雪利王鑫王杰王慧龙
Owner 广东云津工程建设有限公司
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