Large-diameter shield tunnel concrete segment connecting construction

Abstract

Disclosed is a large-diameter shield tunnel concrete segment connecting construction. According to the large-diameter shield tunnel concrete segment connecting construction, weakening of the connecting construction to a concrete segment structure is reduced effectively, durability is reliable, fabricating is convenient, and the safety of hoisting operation is increased. The connecting construction comprises a first concrete segment and a second concrete segment which are located on the two sides of a joint. The first concrete segment is provided with a first hand hole, a first straight hole and a second straight hole. The outer end of the first straight hole communicates with the first hand hole. The axes of the first straight hole and the second straight hole are staggered. The outer end of the second straight hole communicates with the joint side end wall of the first concrete segment. The second concrete segment is provided with a second hand hole and an arc-shaped hole. One end of the arc-shaped hole communicates with the second hand hole, and the other end of the arc-shaped hole communicates with the joint side end wall of the second concrete segment. Ports of the second straight hole and the arc-shaped hole which are on the two sides of the joint correspond to each other. A first connecting rod provided with a straight section and an arc-shaped section penetrates into the second straight hole and the arc-shaped hole. A second connecting rod penetrates into the first straight hole from the first hand hole, and the rear portion of the second connecting rod penetrates through a connecting hole in the first connecting rod and is connected with the first connecting rod. A thread section is arranged on the front portion of the first connecting rod. A nut and retaining gasket assembly is mounted on the thread section in the second hand hole.

Description

technical field [0001] The invention relates to a shield tunnel, in particular to a large-diameter shield tunnel concrete segment connection structure. Background technique [0002] my country's shield tunnels are in a period of high-speed construction. Shield tunneling generally refers to the assembly of segmented prefabricated segments under the protection of the shield shell of the shield machine to form a permanent support system for the tunnel. The gap between segments is usually Use bolts with certain rigidity to connect. At present, the more commonly used methods mainly include straight bolts, inclined bolts and curved bolts. [0003] The straight bolt connection form is simple and the force system is clear. However, due to the limitation of the assembly principle, the segment structure, especially the concrete segment structure, is greatly weakened. Small impact on the structure and high assembly quality are achieved; the oblique bolts form a certain angle with the j...

AI Technical Summary

Problems solved by technology

[0003] The straight bolt connection form is simple and the force system is clear. However, due to the limitation of the assembly principle, the segment structure, especially the concrete segment structure, is greatly weakened. Small impact on the structure and high assembly quality are achieved; the oblique bolts form a certain angle with the joint, and the force system is not clear. Although the weakening of the segment structure is relatively small due to its assembly principle, it is necessary to pre-embed the threaded sleeve , its durability and ease of assembly are difficult to balance, and it is not suitable when the wall thickness of the segment is small; the bent bolts better combine the advantages of straight bolts and oblique bolts, durability, stress system, weakening of the structure, and difficult assembly However, with the changes in my country's shield tunnel construction requirements and the development of shield machinery technology, in large-diameter, large-block segments, the weakening of the structure by curved bolts is still relatively large, and the large-area distribution The bolt hand holes on the inner arc surface of the segment bring inconvenience to the design and use of vacuum suction cups

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