Improved method for connection tensioning and dismantling of adjacent tunnel pipe segments

Abstract

The invention provides an improved method for connection tensioning and dismantling of adjacent tunnel pipe segments. According to the improved method, pipe segment bolts, small connecting plates, hexagonal threaded sleeves, forward threaded nut bolts and reverse threaded nut bolts are used. By means of the method, the construction difficulty of connection tensioning or dismantling of the adjacentpipe segments can be solved, the potential safety hazards, caused by a damp working environment, to butt welding or gas cutting are eliminated, and the construction cost and time are saved. By meansof pure physical construction, and damage caused by welding slags and electric arcs to the pipe segments, and welding high-temperature cracking are avoided; and in addition, construction can be conducted in the damp environment, and the damp-environment safety electric shock hazard is eliminated. By means of the improved method, the construction time is short, some auxiliary welding machines and cutting gun tools are omitted, the adjacent pipe segments are connected and tensioned after tunnel holing-through, semi-connecting plates are physically dismantled, secondary damage of previous hot cutting to the pipe segments is avoided, and the safety reliability of adjacent tunnel pipe segment connection tensioning construction is improved.

Description

technical field [0001] The invention belongs to the technical field of reinforcing and tensioning adjacent segments, in particular to an improved method for connecting, tightening and removing adjacent segments of a tunnel. Background technique [0002] The segments installed at the initial and final stages of tunnel excavation need to be connected by segment bolts and half-connection plates, combined with figure 1 , the existing connection tensioning mode of adjacent segments is: [0003] After the first segment 1 is docked with the second segment 2, pass the segment bolt 3 through the first segment 1 and the second segment 2 through the reserved hole, and then put half The connecting plate 4 is prepared and tightened by a nut, and finally the prepared two and a half connecting plates 4 are welded together to complete the connection and tightening of adjacent segments. [0004] The semi-connecting plate can only be removed after the secondary grouting and all segments are...

AI Technical Summary

Problems solved by technology

[0006] Whether it is the connection tensioning process or the dismantling process, butt welding or gas cutting must be performed on the two and a half connecting plates 4. Since the temperature of butt welding or gas cutting exceeds 1000°C, it is easy to cause high-temperature cracks to the segment, and at the same time, the butt welding Arc welding slag or gas cutting is also easy to cause local damage to the segment, especially when the adjacent segment is located at the bottom of the tunnel and is affected by damp water, butt welding or gas cutting cannot be performed, which poses a greater safety hazard to welding personnel

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