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Construction method of extra-large diameter shield tunnel penetrating through urban overhead pile foundations in close range

A super-large-diameter, shield tunneling technology, which is applied in the direction of tunnels, infrastructure engineering, and foundation structure tests, can solve the problems of high traffic control costs, poor application, and large construction sites, and reduce soil mass. Disturbance, reduce the impact of traffic, and improve the effect of lateral displacement

Inactive Publication Date: 2012-12-12
TONGJI UNIV
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Problems solved by technology

However, this method requires a large construction site and cannot be well applied to dense areas of traffic and buildings. Urban elevated roads are often located in prosperous areas of the city, and the cost of traffic control is huge, so this method is not suitable for super large diameters. Situation of Shield Tunneling Through Urban Elevated Pile Foundation

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  • Construction method of extra-large diameter shield tunnel penetrating through urban overhead pile foundations in close range
  • Construction method of extra-large diameter shield tunnel penetrating through urban overhead pile foundations in close range

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Embodiment

[0029] Such as Figure 1~2 As shown, the ultra-large diameter shield tunnel of the present invention passes through the pile foundation of the elevated pile foundation in the city at close range, including the method, mainly including the following construction procedures:

[0030] 1. "口"-shaped reinforcement of soil between pile foundations

[0031] Such as figure 1 Shown is a cross-sectional schematic diagram of a "mouth"-shaped reinforcement body 1 of the soil between pile foundations. A test section needs to be set up before crossing. It is required that the soil layer of the test section is distributed similarly to the crossing node. A row of single piles with the same specifications as the crossing node pile foundation are arranged on both sides of the tunnel advancement area of ​​the test section. The inclinometer tube is preset in the hole. When the shield passes through the test section, the lateral displacement mode of the pile foundation is obtained by measuring t...

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Abstract

The invention relates to a construction method of an extra-large diameter shield tunnel penetrating through urban overhead pile foundations in a close range. The construction method includes the following steps: (1) constructing a square-shaped reinforcing body in a soil body among the pile foundations: judging the transverse displacement mode of the pile foundations according to the shielded pile penetration results, choosing the maximum transverse displacement of a first pile foundation on the upper portion of a tunnel to serve as the square-shaped upper portion cross reinforcing position, and performing squared-shaped bottom reinforcing at the position 3m under the bottom of the tunnel; (2) connecting pile foundation bearing platforms to form a large mat foundation: reinforcing the soil body among the pile foundations, excavating the soil bodies among the bearing platforms, enabling the pit bottom elevation to be the bottom of a pit, refilling high-strength concrete after the excavation is finished to form an integral mat foundation, and recovering a road surface; and (3) performing extra large diameter shielding penetration. Compared with the prior art, the construction method of the extra-large diameter shield tunnel penetrating through the urban overhead pile foundations in the close range can effectively reduce soil body turbulence when an extra large diameter shield penetrates through the pile foundations in the close range, ensures safety in the construction process and the like.

Description

technical field [0001] The invention relates to the protection of surrounding buildings (structures) during the construction of urban underground passages, in particular to an elevated pile foundation protection measure in the process of super-large-diameter shield tunneling sideways through urban elevated pile foundations. Background technique [0002] With the development of urban infrastructure construction, the demand for underground space development is gradually increasing. In this process, two prominent contradictions appeared in the construction of underground engineering. One is the gradual increase of tunnel diameter. With the development and maturity of shield technology in recent years and its successful application in China, it is possible to construct super-large-diameter tunnels. With the successful construction of several super-large-diameter cross-river tunnels in the Yangtze River Basin, the demand for super-large-diameter shield tunnels in major cities ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D31/00E02D33/00E21D9/00E21D9/06
Inventor 张子新刘超
Owner TONGJI UNIV
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