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Method for treating bridgehead bumping through transverse guide hole expansion jacking

A bridge head jumping and hole expansion technology, which is applied to roads, roads, buildings, etc., can solve problems such as abutment stability hazards, road surface subsidence, and uneven longitudinal settlement of road-bridge joints, achieving precise lifting and reset, durable and compressible , the effect of lower compressibility

Active Publication Date: 2021-08-10
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this patented technology does not provide a solution to the following problems: the longitudinal settlement of the road-bridge junction is non-uniform, the differential uplift effect caused by the uneven expansion between the hole position and its gap, the road surface subsides again in the road-bridge transition section after the uplift, and Harm of Horizontal Expansion at Abutment to Abutment Stability
In addition, vertically downward or inclined drilling on the road requires traffic control, which affects the normal operation of the road

Method used

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  • Method for treating bridgehead bumping through transverse guide hole expansion jacking
  • Method for treating bridgehead bumping through transverse guide hole expansion jacking
  • Method for treating bridgehead bumping through transverse guide hole expansion jacking

Examples

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Comparison scheme
Effect test

Embodiment 1

[0081] Example 1——Repair of differential settlement after bridge head lamination

[0082] There is a 10m-long bridge head slab in the transitional section of a high-grade highway. There is a maximum differential settlement of 10cm between the end of the bridge head slab and the junction of the subgrade, and "bridge head jumping" mainly occurs at the end of the bridge slab. In this regard, excavate and level the site to form an operation platform at the foot of the subgrade side slope within 5m from the end of the slab to the direction of the slab at the bridge head.

[0083] Since the differential settlement is relatively small, only a single layer of boreholes needs to be laid. Use a threaded drilling rig with a hole diameter of 60mm for construction; (below the top surface of the subgrade) the maximum hole depth is 1.50m, and the horizontal distance between adjacent holes is 100mm. In the longitudinal direction, the depth distribution curve of the drilled holes matches the ...

Embodiment 2

[0091] Example 2——repair of hollowing out disease of bridge head lap slab

[0092] There is a 6m-long bridgehead slab in the transitional section of a secondary highway. There is a gap of up to 24cm under the bridgehead slab, and the slab is seriously damaged under the action of heavy vehicles. In this regard, excavate and level the site to form an operation platform at the foot of the subgrade slope within 6m of the slab at the bridgehead section.

[0093] Due to the relatively large differential settlement, it is necessary to lay out two layers of boreholes, and the distance between the upper and lower layers of drill holes is 30cm. Use a threaded drilling rig with a hole diameter of 100mm for construction; (below the top surface of the subgrade) the maximum hole depth is 1.20m, and the horizontal distance between adjacent holes is 60mm. In the longitudinal direction, the depth distribution curve of the drilled holes matches the surface deformation curve of the void.

[00...

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Abstract

The invention discloses a method for treating bridgehead bumping through transverse guide hole expansion jacking, and belongs to an expansion jacking treatment technology for the ''bridgehead bumping disease'' induced by differential settlement of a road-bridge transition section under a traffic condition. The method comprises the following steps of 1) preparing construction; 2) measuring and setting out; 3) preparing an expansion material dry powder; 4) using a roadbed slope transverse spiral drilling machine to drill holes; 5) placing a dendritic grouting steel pipe and a directional expansion component; 6) performing high-pressure blow-filling on the expansion material dry powder, sealing holes and synchronously injecting water; and 7) carrying out side slope earthing and greening. The method is suitable for uneven settlement treatment construction of the filling subgrade of the road-bridge transition section of each grade of highway / urban road / (high-speed) railway.

Description

technical field [0001] The invention belongs to the technical field of post-construction settlement treatment in geotechnical engineering, and in particular relates to an expansion jacking treatment method for the "jumping at bridge head" disease induced by differential settlement of a road-bridge transition section under the condition of opening to traffic. Background technique [0002] At present, my country's highway construction is still in the stage of rapid development. For highways in soft soil areas, within a few years after opening to traffic, the differential settlement of the road-bridge transition section is relatively large, and the disease of vehicle jumping at the bridge head (the longitudinal slope mutation of the road-bridge transition section) is more prominent. In the section where the vehicle jumps at the bridge head, the vehicle jumps violently when it arrives here, which seriously threatens the safety and comfort of driving, reduces the service life of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01C3/00
CPCE01C3/00
Inventor 刘萌成周佳俊
Owner ZHEJIANG UNIV OF TECH
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