JP3798331B2 - 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]
To assemble a tunnel lining segment that introduces pre-stress in the tunnel,
(A) The segment pieces are arranged in a line in the circumferential direction to form a segment ring,
(B) Press the formed segment ring from the face side to the existing segment ring with a jack or the like to keep the position,
(C) Insert a circumferential PC steel wire through the formed segment ring over one circumference, apply tension to the PC steel wire, and fix both ends with fixing notches etc. to form an integral ring And
(D) The tunnel propulsion direction PC steel wire was inserted into the formed plural rows of integrated rings, and the segment wire was attached to the existing segment ring by assembling the PC steel wire and assembled.
[0003]
[Problems to be solved by the invention]
When assembling the above tunnel segments,
(1) Although the segment piece is assembled while pressing the segment piece with a shield jack or the like from the face side, the segment ring is stabilized only after the wire is inserted from the circumferential direction PC steel. Therefore, until then, the unstable elements were large and it was a dangerous work.
(2) The coupling of the segment rings in the tunnel propulsion direction is made easy by inserting a tension material through a plurality of rows of segment rings to stabilize the tension, 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 wire from the circumferential PC steel, and the notch provided in the anchoring segment is large. It was necessary to wear a powerful heavy equipment jack, and workability was inferior.
[0004]
The present invention solves such problems, and has improved the technology so that the assembly work of the tunnel lining segment ring can be performed safely and stably and the circumferential tension can be easily performed with a simple device. The purpose is to provide.
[0005]
[Means for Solving the Problems]
The present invention has been made to solve the above problem, the present invention, the segment ring plurality met segment tunnel lining made by dividing the circumferentially tunnel to each segment piece along the propulsion direction with advance through the PC steel bars screwed to the nut connecting member, from the circular circumferential PC steel 2-3 segment piece of the divided segment pieces the the plurality using tunnel lining for segments is provided with a connecting portion housing recess of the line. Here, the long nut connecting member is a member having a female screw on the inner diameter and having an outer shape of a hexagonal nut shape and a long length in the screw direction, and is connected by screwing two male screw bolts from both sides. In addition, the connecting portion storage recess is a recess for storing a connector that divides a circumferential PC steel strand into a plurality of arcuate PC steel strands and connects the PC steel strands at the divided portions. It is the recessed part provided in. The concave portions are provided only in a necessary plurality of segment pieces constituting the segment ring. As this connection tool, a tension fixing body separately disclosed by the present inventor may be used.
[0006]
The method for assembling the segments is as follows. That is, the present invention is a tunnel lining segment obtained by dividing a segment ring into a large number in the circumferential direction, and each segment piece is a PC steel screwed with a long nut connecting member along the tunnel propulsion direction. A tunnel cover in which a rod is inserted in advance into each segment piece, and two to three segment pieces out of the segment pieces are provided with connecting portions containing recesses in the circumferential direction PC steel wires. Ru using the factory for the segment. And the PC steel rod of each segment piece is connected to the PC steel rod of the existing segment ring in order and temporarily tensioned, and the connecting portion of the circumferential PC steel strand is attached after the third piece or the fourth piece. Insert in a circular arc from the storage recess, or after forming a new segment ring of one circumference, insert it into the new segment ring, and fix the tension of the PC steel wire in the above-mentioned 2-3 connection recesses A method for assembling a tunnel lining segment characterized by connecting to each other through a body and then tensioning the PC steel wire by the tension fixing body and then tensioning the temporarily tensioned propulsion direction PC steel bar. It is. As the tension fixing body used here, it is preferable to use a tension fixing body provided with a pair of fixing members and a tension means for pulling the tension member separately proposed by the present applicant.
[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 showing a segment piece 1 according to one embodiment of the present invention. This segment piece 1 incorporates a PC steel bar 2 in parallel along the tunnel propulsion direction, and a long nut connecting member 3 is screwed to one end of the PC steel bar 2. This long nut connecting member 3 is attached in a state in which approximately half of the length of the internal thread of the inner diameter is screwed into the end portion of the PC steel rod 2 along the screw propulsion direction. The segment pieces of the segment ring (not shown) adjacent to the segment piece 1 are in contact with the segment piece 1 in a staggered arrangement, and the PC steel bars are arranged at positions where they can be connected to each other. The PC steel bar built in the adjacent segment piece is screwed into the long nut connecting member 3 to connect the PC steel bars.
[0009]
Further, a sheath 11 for inserting a wire from a circumferential PC steel is embedded in the segment piece 1. The segment piece 1 in FIG. 1 shows a circumferentially-oriented PC steel wire provided with a connecting part accommodating recess 12, and this connecting part accommodating recess 12 is a segment piece that forms a circumferential segment ring. Of these, only two to three segment pieces are provided. Further, a through hole 13 for injecting grouting on the back surface of the segment is provided in a substantially central portion of the segment piece 1.
[0010]
2 and 5 to 8 are process diagrams showing the assembly process of the segments of the embodiment, and FIGS. 3 and 4 are views taken along arrows AA and BB in FIG. 2, respectively. 2 and 5 to 8 show development views of the tunnel lining.
[0011]
As shown in FIG. 2, the new segment piece 21 is attached to the face side of the existing segment ring 41. At this time, the segment piece 21 is pressed by the shield jack 33 from the excavation head 31 of the shield machine, and the PC steel rod 2 incorporated along the tunnel propulsion direction is electrically or air torque wrench 34 using the PC steel of the existing segment ring. Combine with the rod and temporarily tension (see FIG. 3). The excavation head 31 has a cutter bit 32 in contact with the face.
[0012]
In this embodiment, the circumferentially-oriented PC steel twisted wire insertion sheath 11 and the circumferentially-oriented PC steel twisted wire connecting portion receiving recess 12 are provided at two locations on one circumferential segment ring (FIGS. 2 and 4). reference).
[0013]
FIG. 5 shows a state in which the segment piece 21b is installed next to the segment piece 21a connected in FIG. The process of connecting the PC steel rod with the electric or air torque wrench 34 and temporarily tensioning is the same as that shown in FIG. FIG. 6 shows that the segment pieces 21a and 21b are followed by the third segment piece 21c, and a PC steel rod is joined with an electric or air torque wrench 34 to be temporarily tensioned, and then the circumferential PC steel strand 11 is connected to the segment piece 21a. , 21b, 21c are shown inserted.
[0014]
Further, the segment pieces are attached one after another, and a row of segment rings 42 is formed as shown in FIG. 7 and connected to the existing segment ring 41. FIG. 7 shows that the circumferential direction PC steel strand 11 is inserted into the circumferential sheath at this stage. However, as explained in FIG. 6, the circumferential direction PC steel strand 11 is inserted. The timing to perform may be the time when the third or fourth segment piece is attached. The circumferential direction PC steel strand is inserted easily because the strand of PC steel divided into one circle is inserted into the sheath between the connecting portion accommodating recesses 12 in an arc shape. The PC steel stranded wire 11 is coupled in the connecting portion housing recess 12 and is tensioned by an electric or air torque wrench 43 or the like through the double gear box in this recess to give pre-stress to the segment ring.
[0015]
FIG. 8 shows a process in which the PC steel material in the tunnel propulsion direction is tightened again with the hydraulic torque wrench 44 and is in full tension.
[0016]
【The invention's effect】
According to the present invention, the PC steel material in the tunnel propulsion direction is installed in advance in the segment piece, and the segment piece is easily and safely connected to the existing segment ring by connecting with the existing PC steel material by the long nut connecting member. be able to. 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. By separating the temporary tension and the main tension, it is possible to reliably introduce the propulsion direction prestress.
[0017]
By dividing the length of the circumferential direction PC steel strand into a plurality of pieces such as 1/2 or 1/3 of the circumference, the length can be easily inserted by hand. By using the mutual fixing member accommodated in the connecting and accommodating recess, the wire can be tensioned in the circumferential direction PC steel easily and lightly with a torque wrench. Therefore, there is no loss of tension due to set loss. When compared with the same tension, the PC steel diameter can be reduced compared to the conventional method. Tensioning with a torque wrench makes the work required for tension simple and light. The notch in the connecting portion can be repaired by embedding using a grout having the same strength as the segment, and can be considered in the same manner as the segment.
[Brief description of the drawings]
FIG. 1 is a schematic front view of a segment of an embodiment.
FIG. 2 is a development view of the inner surface of the tunnel showing the assembly process of the segments of the embodiment.
FIG. 3 is a view taken along arrow AA in FIG. 2;
4 is a view taken along arrow BB in FIG. 2;
FIG. 5 is a development view of the inner surface of the tunnel showing the segment assembling process of the embodiment.
FIG. 6 is a development view of the inner surface of the tunnel showing the segment assembling process of the embodiment.
FIG. 7 is a development view of the inner surface of the tunnel showing the segment assembling process of the embodiment.
FIG. 8 is a development view of the inner surface of the tunnel showing the segment assembling process of the embodiment.
[Explanation of symbols]
1 Segment 2 PC steel bar (propulsion direction)
3 Long nut connecting member 11 Circumferential PC steel strand (sheath)
12 Fixing portion 13 Through hole 21 Segment piece 31 Excavation head 32 Cutter bit 33 Shield jack 34 Electric or air torque wrench 41 Existing segment ring 42 New segment ring 43 Electric or air torque wrench 44 Hydraulic torque wrench

Claims (1)

The segment ring plurality met segment tunnel lining made by dividing the circumferentially to each segment piece the PC steel bars screwed to the nut connecting member along the tunnel propulsion direction to each segment piece By using a tunnel lining segment that has been inserted in advance and provided with a connecting portion accommodating recess of a circumferential direction PC steel strand in two to three segment pieces among the segment pieces divided into a plurality of pieces. ,
The PC steel bar of each segment piece is connected to the PC steel bar of the existing segment ring one after another and temporarily tensioned, and the PC steel stranded wire in the circumferential direction is connected to the connecting portion storage recess after the third piece or the fourth piece is attached. Is inserted in a circular arc shape, or a new segment ring of one circumference is formed and then inserted into the new segment ring, and the PC steel strand is inserted into the above-mentioned two or three connecting portion housing recesses. The tunnel lining segment assembling method is characterized in that after being connected to each other through the tension fixing body and then tensioning the strands of the PC steel by the tension fixing body, the temporarily tensioned PC steel bars in the propulsion direction are fully tensioned .

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