JP3798332B2 - Method for assembling tunnel lining segments - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method of assembling segment tunnel lining.
[0002]
[Prior art]
Conventionally, tunnel lining segments that introduce pre-stress form a segment ring, insert a circumferential strand over one circumference, and apply tension to this circumferential strand to form an integral ring However, this was pressed from the face side to the existing segment ring with a jack or the like to maintain the position, and a plurality of rows of integral rings were connected in the tunnel propulsion direction.
[0003]
When forming the above tunnel segment,
(1) While assembling the segment while pressing it against the existing segment ring with a shield jack from the face side, the segment ring is stable only after the circumferential strand is inserted. Met.
(2) In addition, the propulsion direction is strained by inserting a tension material through a plurality of rows of segment rings, but the operation is not easy.
(3) Since the circumferential tension of the segment ring is performed at one place on the circumference, it takes time to insert the circumferential strand, the notch provided in the anchoring segment is large, and the tension is strong and heavy equipment It was necessary to wear a jack, and workability was inferior.
[0004]
[Problems to be solved by the invention]
The present invention uses the tunnel lining for segments arranged an X-shape PC steel for the tunnel propulsion direction, so that assembly of the segment ring can be safely and stably carried out easily be The aim is to provide improved technology.
[0005]
[Means for Solving the Problems]
The present invention has been made to solve the above problems, is disposed in the segment through a substantially central portion in an X shape for the tunnel propulsion direction of the segment, the post having a connector on both ends using tunnel lining for segment with PC steel tension method provides a technique to work stably. Here, the arrangement in the X shape in the tunnel propulsion direction means that, in the development view of the segments, oblique PC steel materials having the same positive and negative inclination angles with respect to the tunnel propulsion direction are arranged on the adjacent segments and the back side. When the entire segment is attached, it means that the PC steel material is arranged in a rhombus network.
[0006]
The segment assembling method of the present invention is as follows. In other words, using a tunnel lining segment in which a post-tension PC steel material with connectors at both ends passes through the center of the segment and is arranged in the segment in an X shape with respect to the tunnel propulsion direction. Each segment piece of the segment ring is pressed against the existing segment ring with a shield jack from the face side one by one, and the PC steel material built in the pressed segment piece is connected to the end of the PC steel material of the existing segment ring, and a temporary tension is assumed. after completion of assembly of the newly established segment ring, while the entire the segment ring pressed together with the shield jack fixed to the tension the PC steel stress introduction and fixing of the tunnel propulsion direction and the circumferential direction of the segment A method for assembling a tunnel lining segment, which is achieved simultaneously.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0008]
FIG. 1 is a schematic front view of a segment piece 100 according to one embodiment of the present invention. This segment piece 100 incorporates a PC steel material 2 in an X shape in the tunnel propulsion direction, and the PC steel material 2 has a connector 3 at one end. The segment pieces 110 of the existing segment ring adjacent to the segment pieces 100 are in contact with the segment pieces 100 in a staggered arrangement, and the PC steel materials 2 are arranged at positions where they can be connected to each other.
[0009]
2 to 4 are process diagrams showing an assembly process of the segment 100 of the embodiment. 2 to 4 show development views of the tunnel lining. As shown in FIG. 2, the new segment piece 100 a is attached to the face side of the existing segment ring 110. At this time, the segment piece 100a is pressed from the excavation head 31 of the shield machine by the shield jack 33, and the PC steel material 2a built in the X shape is coupled to the PC steel material 2a of the existing segment ring 110 using the electric torque wrench 34. Let me be tense. The excavation head 31 has a cutter bit 32 in contact with the face.
[0010]
FIG. 3 shows a state in which another segment piece 100b is installed next to the segment piece 100a connected in FIG. The electric steel or air torque wrench 34 is used to connect the PC steel material 2 and the PC steel material 2a of the existing segment ring 110, and the process of temporarily tensioning is the same as in FIG. Install the segment pieces one after another. FIG. 4 shows a state in which one row of segment rings 100 is connected to the existing segment ring 110, the PC steel material 2 is coupled, and tension is introduced into the PC steel material 2 of the new segment ring 100 by the hydraulic torque wrench 43 or the like. In this way, it is possible to apply an appropriate prestress uniformly in the tunnel propulsion direction and the circumferential direction of the segment.
[0011]
【The invention's effect】
According to the present invention, a PC steel material is formed in an X shape in a segment piece and connected to an existing PC steel material, whereby the segment piece can be easily and safely connected to an existing segment ring. The segment piece can be fixed by temporarily tensioning the PC steel material. Since tension is applied on the face side, no cutout is required on the inner surface of the segment. It is possible to introduce the propulsion direction and the circumferential prestress uniformly evenly by fully tensioning each PC steel material of the segment ring. Since tension is tensioned with a torque wrench, there is an advantage that the work required for tension is simple and light, and requires a small space.
[Brief description of the drawings]
FIG. 1 is a schematic front view of a segment piece of an embodiment.
FIG. 2 is an assembly process diagram of the segment piece of the embodiment.
FIG. 3 is an assembly process diagram of the segment piece of the embodiment.
FIG. 4 is an assembly process diagram of the segment piece of the embodiment.
[Explanation of symbols]
2 PC steel 3 Connecting device 31 Excavation head 32 Cutter bit 33 Shield jack 34 Electric or air torque wrench 43 Hydraulic torque wrench 100 New segment piece 110 Existing segment ring

Claims (1)

A new segment ring using a tunnel lining segment in which post-tensioned PC steel with connectors at both ends passes through the center of the segment and is arranged in the segment in an X-shape with respect to the tunnel propulsion direction. Each segment piece is pressed into the existing segment ring with a shield jack from the face side, and the PC steel contained in the pressed segment piece is connected to the end of the PC steel material of the existing segment ring. After the assembly of the segment ring, the PC steel material is fully tensioned and fixed while pressing the entire segment ring together with a shield jack, and simultaneously introduces and fixes the stress in the tunnel propulsion direction and the circumferential direction of the segment. A method for assembling a tunnel lining segment.

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