Tunneling construction method for directly removing overpass group piles by using shield machine

A construction method and overpass technology, applied in earthwork drilling, wellbore lining, tunnel lining, etc., can solve the problems of high risk, difficult underpinning, and high cost, and achieve the effects of short construction period, reduced construction risk, and simple process

Active Publication Date: 2012-04-18
CHINA RAILWAY 12TH BUREAU GRP +1
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Problems solved by technology

[0004] In order to solve the problems of difficulty, high cost, and high risk of traditional tree root pile underpinning, the pr

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  • Tunneling construction method for directly removing overpass group piles by using shield machine
  • Tunneling construction method for directly removing overpass group piles by using shield machine

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[0078] The section from Yingbin Road Station to Furong Square Station of Changsha Metro Line 2 has a total length of 550 meters and is constructed with shield tunneling. In this section, shield tunneling needs to cut off 24 bridge piles of the Furong Overpass. The high-voltage cable tunnel is only 1.3 meters away from the shield tunnel.

[0079] The left line of this section began to enter the Furong overpass on May 10, 2011. It took only 10 days to cross the overpass safely, and 3 bridge piles were directly cut off and 15 piles were pierced sideways. The bridge piles did not sink.

[0080] The right line began to enter the bridge area on June 8, 2011. It took only 8 days to successfully complete the removal of 21 piles, with an average daily progress of 15 meters. After monitoring, the bridge piles did not settle, and the maximum settlement of the ground outside the valve plate was also It is only 2mm, which fully proves that the method of the present invention has strong app...

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Abstract

The invention relates to the technical field of tunnel shield construction, in particular to a tunneling construction method for directly removing overpass group piles by using a shield machine, which solves the problems of big risk, high technical requirements, a long construction period, high cost and the like when the conventional bridge pile is underpinned by a shield tunnel boring machine in the prior art. The tunneling construction method comprises the following steps of: assessing the risk and then underpinning pile foundations of the group piles by performing valve plate construction and grouting jointly; performing optimization reconstruction on the shield machine before a bridge pile is removed by the shield machine; slowing down the shield machine before the bridge pile is removed by the shield tunneling machine; adjusting torque dynamically when the bridge pile is removed; tunneling at a low rotation rate after the bridge pile is removed; performing ground tracking grouting after the shield machine passes through the bridge pile; and detecting the inner part of a tunnel by using a radar and then grouting complementally in time. The tunneling construction method for directly removing the overpass group piles by using the shield machine has the advantages of simple process, short construction period, low cost, controllable risk, good economic and social benefits, wide applicable range and the like.

Description

technical field [0001] The invention relates to the technical field of tunnel shield construction, in particular to a tunneling construction method for directly cutting overpass pile group by shield. Background technique [0002] With the continuous construction of urban infrastructure, subway rail transit is showing a trend of rapid development. However, due to the constraints of the original urban planning, the new subway tunnel will inevitably cross the existing overpass partly during construction. In China, tree root piles are generally used to underpin the pile foundation, and then the original bridge piles are manually removed. This technology is a special construction method with high technical difficulty, high cost, long construction period and high risk. In foreign countries, while ensuring the function of the old bridge during construction, remove obstacles that affect the forward advancement of the shield, first reinforce the structure itself, underpin the bridge ...

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Application Information

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IPC IPC(8): E21D9/08E21D9/093E21D11/10
Inventor 王宗勇雷军祁玺剑毋海军
Owner CHINA RAILWAY 12TH BUREAU GRP
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