Box-raft pressure-bearing type foundation underpinning and construction reinforcing method for tunnel across pile foundation of bridge above river

A river-crossing, pressure-bearing technology, applied in infrastructure engineering, infrastructure repair, sheet pile walls, etc., can solve problems such as construction period, cost, and surrounding environment with higher requirements, ground traffic impact, and negative social effects. , to achieve the effect of underpinning technology and pile removal technology to promote, improve the level of subway construction, and speed up the construction progress

Inactive Publication Date: 2010-06-30
TONGJI UNIV +1
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Problems solved by technology

Although this method is more feasible when the construction scale is small and the traffic impact time is short, the disadvantages are: (1) it has high requirements for the construction period, cost and surrounding environment; (2) it needs to demolish two Bridges and building two bridges are not only time-consuming and labor-intensiv

Method used

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  • Box-raft pressure-bearing type foundation underpinning and construction reinforcing method for tunnel across pile foundation of bridge above river
  • Box-raft pressure-bearing type foundation underpinning and construction reinforcing method for tunnel across pile foundation of bridge above river
  • Box-raft pressure-bearing type foundation underpinning and construction reinforcing method for tunnel across pile foundation of bridge above river

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Embodiment 1

[0031] The present invention includes: foundation reinforcement of abutment 8 on both sides of the bridge, construction of cofferdam 10, river bed reinforcement 11 outside the scope of the bridge foundation, reinforcement of under-bridge support 17, excavation of foundation pit 23 under the bridge in cofferdam 10, expansion of slab type in foundation pit 23 Foundation and under-slab foundation reinforcement 22, shield tunneling 26 advancement and obstacle pile foundation removal.

[0032] (1) The gravity retaining wall 2 is formed through foundation reinforcement. The foundation reinforcement adopts the high-pressure rotary grouting pile 1 of the triple pipe method, the cement content is 25%, the pile diameter is Φ1600mm, and the overlap between piles is 300mm. In order to increase the strength of the gravity retaining wall 2, 300×300×10×15 H-shaped steel 3 is inserted into the inner and outer rows of piles of the rotary grouting pile 1 retaining wall. The row of piles 5 is "...

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Abstract

The invention relates to a geotechnical and underground engineering technology field, particularly to a box-raft pressure-bearing type foundation underpinning and construction reinforcing method for tunnels across pile foundations of a bridge above a river. The method of the invention comprises: reinforcing abutment foundation of both sides of the bridge, reinforcing the riverbed outside the cofferdam construction and abutment, strengthening bridge supports, excavating pits under cofferdam bridges, strengthening expanding plate-type foundations inside the pits and ground base under the plates, as well as shield tunneling and removing obstructive file base. The method can smoothly complete construction and guarantee smooth shield tunneling while ensuring normal passage of existing bridge structure, further can effectively reduce construction risk, accelerate construction process, reduce cost and reduce influence to environment to a maximal extent.

Description

technical field [0001] The invention belongs to the technical field of geotechnical and underground engineering, and in particular relates to a box-raft pressure-bearing foundation underpinning and construction reinforcement method for a bridge pile foundation above a river where a tunnel crosses. Background technique [0002] With the acceleration of urbanization, traffic congestion is becoming a bottleneck restricting its development, and the ever-increasing passenger flow has put forward higher requirements for the development of Shanghai's urban construction. In view of the fact that rail transit, as a large-capacity rapid transit system, is playing an increasingly important role in the entire urban passenger flow transportation, major cities in the world have taken the construction of rail transit networks as the focus of urban infrastructure construction, and the construction of rail transit has entered the a period of concentrated development. Represented by the cons...

Claims

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Application Information

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IPC IPC(8): E02D5/00E02D5/64E02D37/00
Inventor 马险峰马忠政徐前卫王秀志杨洪杰刘朝明王磊
Owner TONGJI UNIV
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