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Method and device for lifting roadbed settlement of existing road

A technology for subgrades and roads, applied in roads, roads, buildings, etc., can solve the problems that restrict the speed, comfort and safety of the road, shorten the service life of the road, increase the investment in road maintenance, etc., to achieve a large lifting height, easy entry into the soil, fast construction effect

Inactive Publication Date: 2013-04-10
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Many road surface problems caused by uneven subgrade settlement are very harmful. It restricts the express, comfortable and safe overall function of the highway, and even leads to major traffic accidents of car crashes and deaths.
At the same time, it also increases the maintenance investment of the road, shortens the service life of the road, causes the country to suffer economic losses, and causes a bad influence on the society

Method used

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  • Method and device for lifting roadbed settlement of existing road
  • Method and device for lifting roadbed settlement of existing road
  • Method and device for lifting roadbed settlement of existing road

Examples

Experimental program
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Effect test

specific Embodiment 1

[0060] According to the investigation report of a vehicle jumping treatment project at the bridge head, the subgrade soil layer of the road is cohesive soil, the total thickness of the pavement (u) structure is 60cm, and the height of the subgrade is 5m. Both sides of the road are open, which is convenient for construction. There is a settlement of the entire road surface at the bridge head, the maximum settlement is 31mm, the degree of subsidence is inversely proportional to the distance from the bridge head, and the width of the road surface is 30m

[0061] (1) Adopt the method of simultaneous construction on both sides of the road. In the subsidence section of the road surface at the junction of the road and bridge, a mechanical lifter A1 with an end baffle (10) is horizontally implanted about 50cm below the bottom layer of the road surface structure (such as Figure 3a and Figure 3b ). Use the small drill screw mechanical drilling method to drill holes in the road in the...

specific Embodiment 2

[0066] A road renovation project, according to the survey report: the project site is sandy soil, the total thickness of the road surface structure is 40cm, the height of the roadbed is 4m, the road is built along the riverbed, the construction conditions on both sides of the road are sufficient, the density of the roadbed is not good, the roadbed The maximum settlement is 50mm, and the settlement form of the road surface is half-width road settlement. Road width 20m

[0067] (1) Use the method of half-width construction on the subsidence section of the road. In the subsidence section of the road surface, a single-row hydraulic lifter A2 (such as Figure 4a and Figure 4b ) are welded with end baffles (10). Use the auger earth drilling machine produced by a company in Bazhou City to carry out the soil-discharging method to drill holes in the road on both sides of the road horizontally. The designed hole length is 10m in half width of the road, the width of the hole is 25cm, ...

specific Embodiment 3

[0072] A road comprehensive treatment project, according to the survey report: the project site is sandy clay, the total thickness of the pavement structure is 50cm, the height of the subgrade is 4.5m, the road surface settlement form is uneven partial subsidence, and the settlement area is an irregular area with a diameter of 8m , the maximum settlement of the road surface is 50mm, and the road surface width is 50m.

[0073] (1) In the way of construction on one side of the road in the subsidence area, use the small drill screw mechanical dumping method to drill holes horizontally into the road at 50cm below the bottom of the road surface (u). The hole diameter is 35cm wide and 15cm high; Press the expansion material into the groove (p) of the lifter A3, and at the same time fasten the upper lifting slot plate (m) with the lower lifting slot plate (n). Here, the double-slot expansion lifter A3 (such as Figure 5b ), in the subsidence section of the road surface, the expansion...

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Abstract

The invention provides a method and a device for lifting roadbed settlement of the existing road. The method comprises the following steps: horizontally inserting a plurality of plate-shaped lifters capable of performing one-dimensional expansion into the roadbed sequentially according to the position and the quantity required by the design in the zone where the roadbed of the road is settled non-uniformly and in the certain distance below the contact interface between the road surface and the foundation, wherein the lifters are gradually expanded vertically according to the sequence, and the expansion rate and the expansion amplitude required by the design, so that the settled roadbed is lifted and recovered to the roadbed design target value; sequentially substituting block materials with sufficient strength and grouting holes for the plate-shaped lifters; and injecting a proper amount of known gel materials so as to fill the gap of the block materials, form holes in soil in the lifting process and fulfill the aim of lifting the roadbed settlement of the existing road.

Description

technical field [0001] The invention belongs to the technical field of road and bridge construction engineering, and relates to a method and a device for raising the settlement of an existing road subgrade. Background technique [0002] Uneven settlement of subgrade is one of the common diseases of subgrade engineering, which is common in domestic and foreign highways and has not been effectively solved for a long time. The uneven settlement of the subgrade will inevitably cause the unevenness of the road surface, which is mainly manifested as joint steps, road settlement at the ends of bridge heads or culverts, and uneven settlement caused by local subgrade diseases. [0003] Many road surface problems caused by uneven subsidence of the roadbed are very harmful. It restricts the express, comfortable and safe overall function of the highway, and even leads to major traffic accidents involving vehicle crashes and fatalities. At the same time, it also increases the maintenanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01C3/00E01C3/04
Inventor 杨建伟李建猛刘金龙黄新
Owner BEIHANG UNIV
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