A double joint waterproof device with segment bolt joint box shield tunnel segment

Abstract

The invention relates to a duplex joint waterproof device for shield tunnel segments with segment bolt joint boxes. The duplex joint waterproof device is used for sealing of a joint surface between a first segment and a second segment adjacent in a shield tunnel. The first segment is connected with the second segment through a bolt, a first segment bolt joint box is arranged at the bolt joint of the first segment, and a second segment bolt joint box is arranged at the bolt joint of the second segment. The waterproof device comprises a first waterproof unit, a second waterproof unit and joint box waterproof units, the first waterproof unit is arranged on the outer arc side of the joint surface, the second waterproof unit is arranged on the inner arc side of the joint surface, and the joint box waterproof units are arranged around the first segment bolt joint box and the second segment bolt joint box and in lap joint with the second waterproof unit to realize joint sealing. Compared with the prior art, the duplex joint waterproof device has advantages of high waterproof performance, convenience in experimental verification and the like.

Description

technical field [0001] The invention relates to the field of joint waterproofing engineering of existing shield tunnels, in particular to a double-channel joint waterproofing device with segment bolt joints and shield tunnel segments. Background technique [0002] In recent years, with the continuous development of underground space in my country and the continuous improvement of urban rail transit networks, the shield method has been widely used in urban subway tunnels and large underwater tunnels due to its advantages of high degree of mechanization, fast construction speed, and small environmental impact. widely used in engineering. According to the survey, water leakage in shield tunnels has become one of the main problems affecting the safety and operation of shield tunnels, especially for power tunnels, sewage tunnels, and subway tunnels. Water leakage not only brings many safety hazards to daily operations . With the emergence of high-pressure cross-river or sea-cros...

AI Technical Summary

Problems solved by technology

In addition, there is a gap between the bolt and the bolt hole of the joint box, and the bolt hand hole has been grouted and sealed. The actual situation shows that the general treatment methods such as grouting and sealed the bolt hand hole are not effective in waterproofing, and the waterproof ability is far away. Much smaller than elastic gasket

Therefore, in the double-layer waterproof defense line, when the first waterproof line fails, water enters the central cavity under the action of water pressure. At this time, the bolt hole of the joint box in the central cavity becomes the most vulnerable part of the waterproof, and it is quickly damaged under the action of water pressure. If it is punctured, the overall waterproofing of the seams will fail, however, the second waterproofing will hardly work and is meaningless in this case

Therefore, for the joints of shield tunnel segments with double waterproofing, the waterproofing at the bolt holes of the joint box becomes the key to whether the double waterproofing can work effectively. At present, there is no design and device for this part at home and abroad.

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