Connecting structure suitable for tunnel segment longitudinal seam

Abstract

The invention discloses a connecting structure suitable for a tunnel segment longitudinal seam. The connecting structure comprises a connecting tenon component and a mortise component, wherein the connecting tenon component is embedded in a to-be-assembled first segment, and the mortise is embedded in a to-be-assembled second segment; and the longitudinal seam is formed between the to-be-assembled first segment and the to-be-assembled second segment, wherein the distributed direction of the longitudinal seam is the same as the tunneling direction of a tunnel, the to-be-assembled first segment and the to-be-assembled second segment are tightly locked through the interlocking effect between the connecting tenon component in the to-be-assembled first segment and the mortise component in the to-be-assembled second segment, and connection of the first segment and the second segment is achieved. According to the connecting structure suitable for the tunnel segment longitudinal seam, hand holes of seam bolts can be reduced simultaneously under the condition that the rigidity of the seam is ensured, concrete force at the seam position is improved effectively, and the risk of damage of concrete at the seam position due to local compression is lowered.

Description

technical field [0001] The invention belongs to the field of tunnel segment connection structures, and more particularly relates to a connection structure suitable for longitudinal seams of tunnel segments. Background technique [0002] At present, the circumferential and longitudinal joints of the shield tunnel segments in the project are generally connected by assembling first and then installing bolts. According to different types of bolts, it can be divided into bent bolts 4, oblique bolts 5, and short straight bolts 6 (as shown in Figure 1). , in the case of large eccentric compression, the combined action of bending moment and axial force will make the segment joints open. Taking the structure under negative bending moment as an example, the open bolts on the outside of the segment joint are under tension, and the concrete surface inside the joint is under compression, and the joint is in a stable state. In general, the bolts can meet the requirements of the project,...

AI Technical Summary

Problems solved by technology

In general, the bolts can meet the requirements of the project, but in soft ground or when the deformation of the lining ring is large, there are the following problems: 1) When the deformation of the lining ring is large, the joint of the segment under the action of the bending moment M When the gap opening θ increases, the force F of the bolts will increase, which will lead to an increase in the compressive stress σ of the concrete. When this trend continues to increase, the concrete stress σ in the compression zone may exceed the compressive strength of the concrete material, resulting in the Sheet 1 is broken (eg figure 2 shown); 2) The bolt connection method is adopted, for example, if the circumferential bolt 10 and the longitudinal bolt 11 are set, it is necessary to set the hand hole (that is, the hole of the construction bolt), the existence of the hand hole will weaken the segment structure, and the hand hole Located near the joint, especially at the corner of the segment near the connecting bolts of the circular joint and the longitudinal joint, the weakening effect of the hand hole will be superimposed, which will have a significant adverse effect on the compression of the concrete at the joint (such as image 3 shown), the weakening of the structure is greater if short straight bolts are used

[0004] The above-mentioned existing technologies have effectively solved certain engineering problems in practical engineering applications, especially played a significant role in improving the stiffness of the annular seam (ie, longitudinal connection) between the segment ring and the ring. (i.e. longitudinal connection) is a reinforcement measure for structural rigidity, which cannot replace the role of bolts. Bolt connection is still required, and bolt hand holes are reserved on the segments, which will inevitably lead to structural weakening at the joints of the segments. , and the above-mentioned similar tongue-and-groove structure and its implementation cannot be directly adopted in the longitudinal seam (ie, the circumferential connection). Segment structure, the local stress is too large, which leads to the problem of segment damage

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