Method for adjusting bridge floor-road surface differential settlement at road-bridge joint of in-service highway

A technology of differential settlement and junction, applied in the direction of roads, roads, road repairs, etc., can solve the problems of reducing vehicle life, vehicle overturning, occupant injury, etc., and achieve the effect of simple construction method, economical construction materials and low cost

Inactive Publication Date: 2013-03-27
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem of vehicle jumping at the bridge head has always been one of the problems that plague the road and bridge engineering technology. It directly affects the comfort of the passengers and the safety

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] According to the survey report, the soil layer of the project site is sandy soil, the thickness of the subgrade pavement structure is 0.65m, the compactness of the subgrade is 93%, and the maximum settlement of the road surface at the bridgehead is 26mm. Use static pressure non-drainage drilling method to drill horizontally into the road at a distance of 0.3m below the bottom of the subgrade pavement structure on both sides of the road. The designed drilling length is half the width of the road at the bridge head and 6m, and the first hole is drilled at a distance of 50mm from the bridge head. Holes, with a diameter of 70mm, are arranged in a row at a distance of 90mm to drill holes away from the bridge head in sequence. Three holes are drilled for each diameter, and the diameters of the holes are 70mm, 60mm, and 50mm respectively, and the pipes with end seals are drilled; The mass percentage of the expansion material is: industrial lime (obtained by calcining at 1150°C,...

Embodiment 2

[0029] According to the survey report, the soil layer of the project site is silty clay, the thickness of the subgrade pavement structure is 0.60m, the degree of subgrade compaction is 92%, and the maximum settlement of the road surface at the bridgehead reaches 27mm; The non-drainage method is used to drill holes in the road horizontally at a distance of 0.35m below the bottom of the subgrade road on both sides of the road with a pipe with end seals. The designed hole length is half of the road width at the bridge head and 5m, and the first hole is drilled at a distance of 45mm from the bridge head. The holes are arranged in a row at a distance of 90 mm and drilled in sequence away from the bridge head. The hole diameter is 60 mm, and the holes are respectively marked as hole 1, hole 2, hole 3, hole 4, hole 5, and hole from near to far from the bridge head. 6, hole 7, hole 8, hole 9; hole 1, hole 2 and hole 3 use expansion material 1, hole 4, hole 5 and hole 6 use expansion ma...

Embodiment 3

[0035] A project site is silty clay, the subgrade pavement structure thickness is 0.68m, the maximum settlement of the road surface at the bridge head is 29mm, the subgrade compaction degree is 92%, and because the foundation is not compact, the foundation void ratio is 0.63, so it needs to be extruded The foundation is dense, so the following two procedures are used:

[0036] (1) Using the spiral screw-in drilling method, use a pipe with an end block at a distance of 0.5m below the bottom of the subgrade pavement structure on both sides of the road to drill holes obliquely toward the inside of the road, and start drilling the first hole at a distance of 60mm from the bridge head, and Drill holes away from the bridge head at a distance of 80mm, the hole diameter is uniformly 50mm, the inclination of the holes is 30 degrees from the road surface, and the drilling depth is 7m. Mix a certain amount of expansion material evenly, introduce it into a barrel-shaped mold with a length...

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Abstract

The invention discloses a method for adjusting the bridge floor-road surface differential settlement at a road-bridge joint of an in-service highway, belonging to the technical field of road and bridge building engineering. The method comprises the following steps of: punching on proper parts in a section experiencing road surface settlement at the road-bridge joint at the bridgehead; placing an expansion material into the hole and extruding densely; sealing the orifice with soil or other materials; and extruding the soil body around by the volume expansion of the expansion material to push the soil body above to move upward so as to generate upward displacement of the sunk road surface and achieve the aim of recovering flatness of the sunk road surface. According to the invention, the expansion material has controllable delay expansion property, and the differential settlement at the road-bridge joint of the in-service highway can be accurately recovered. The construction material is economical, the construction method is simple, the construction is finished without influencing vehicle operation, and the method is a processing method which has low cost and can accurately control the foundation settlement amount and increase the road surface height.

Description

technical field [0001] The invention relates to a method for adjusting the differential settlement of bridge and road surfaces at road-bridge junctions of active highways, and belongs to the technical field of road and bridge construction engineering. Background technique [0002] The connection between the road and the bridge in the middle of the road usually causes differential settlement between the bridge surface and the road surface due to the settlement of the road, resulting in bumpy driving, which is the so-called "bridge head jumping" phenomenon. The problem of vehicle jumping at the bridge head has always been one of the problems that plague the road and bridge engineering technology. It directly affects the comfort of the passengers and the safety of the cargo, and at the same time reduces the life of the vehicle. At present, there is no economical and effective technical measure to eliminate the phenomenon of vehicle jumping at bridgeheads in service. Contents ...

Claims

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Application Information

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IPC IPC(8): E01C23/10C04B28/10C04B28/06
Inventor 刘金龙杨建伟李建猛黄新
Owner BEIHANG UNIV
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