JPS62141298A - Method of bonding concrete segment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a concrete joining method, and particularly to an inter-ring joining method for joining segments in the axial direction of a tunnel.

<Conventional technology> The conventional method of joining concrete segments is Pol 1.
- There are two methods: the one-Nandt joining method and the pin-tenon joining method, but in both cases, it is barely possible to ensure the pressure resistance of the segment as a whole, and the strength of each joining point is not considered, and stress is applied to this point. This concentration caused cracks to occur in the notches, and this weakened joints not only made it impossible to maintain the strength of the tunnel as a whole, but also caused water to flood into the tunnel.

<Problems to be Solved by the Invention> The present invention aims to solve the above-mentioned drawbacks, and its purpose is to eliminate notches and cracks at joints as much as possible, and to reduce shear strength compared to conventionally joined concrete segments. The present invention aims to provide a method for joining concrete segments that is resistant to road forces.

Means for Solving the Problems The present invention solves the above problems, and its gist is to connect segments in the circumferential direction and axial direction of the tunnel to connect segments for lining the inside of the tunnel. In the method, the connection in the axial direction of the tunnel is achieved by using a plurality of prestressed steel wires planted in the ring portion of one adjacent segment 1- with a required length left, and connecting the prestressed steel wires to the other adjacent segment. A through hole is formed in the link part of segment 1- of the PC steel wire corresponding to the planting part of the PC steel wire, and the adjacent segments are fixed by tensioning the PC steel wire that has passed through the link part. There is a method for joining concrete segments.

Here, the concrete segment is reinforced concrete,
It is a general term for prestressed concrete and composite segments made of steel plates and reinforced concrete, which meet the purpose of the present invention, have the structure, and can also achieve the effects.

The ring part of the segment is also called the main girder part at the joint part extending in the axial direction of the tunnel.

<Example> An example of the present invention will be explained with reference to the accompanying drawings. Figure 1 is a partially cutaway schematic diagram showing a concrete segment lined by the method of the present invention, and Figure 2 is a vertical cross-section of the main part of the present invention. FIG. 3 is a partially enlarged view of FIG. 2.

In the figure, reference numeral 1 is a concrete segment, and this concrete segment is constructed by joining the ends, or joints, in the circumferential direction of the tunnel with bolt donuts in the conventional manner for each ring excavated by jacking in the shield method, and the ring portion That is, the main girder parts are joined in the axial direction of the tunnel and lined. Regarding the joining of the ring portion in the axial direction of the tunnel in this case, the structure and joining method will be described below.

As before, the concrete segment consists of a main body part 2, a ring part 3, an end part 4, and a rib part 5 provided in the axial direction of the tunnel between the ring parts 3 and 3. ).

A substantially arc-shaped PC steel wire 6 is planted diagonally from the upper right end to the lower left end, leaving the necessary length for segment forming, and a substantially arc-shaped PC steel wire 6 is planted from the lower right end to the upper left end so as to cross this. A through hole 7 is provided corresponding to the part where the PCM wire 6 is installed. In addition, the end of the buried PC steel wire 6 is
A stopper 8 such as a clasp may also be provided to prevent the PC steel wire from coming off.

To explain the axial connection of the segments having such a structure, that is, the connection between the rings, first, the PC steel wire 6 planted in the ring part 3 of the concrete segment 1 that has already been lined with one ring is connected to the concrete that will be lined from now on. After inserting the segment into the through hole of the segment 1 and tensioning it using a tensioning tool such as a jack, the through hole 7 is inserted into the through hole.
An injection material 9 is injected into the gap between the PC steel wire 6 and the PC steel wire 6 to fix them together. In the figure, numeral 10 is a stem for fastening the PC steel wire into the through hole 7.

Note that the arrangement and number of the pcSW4 wires 6 and the through holes 7 can be arbitrarily selected under the condition that both are arranged at corresponding positions in the ring portion. Further, in this case, even if adjacent segments are arranged in a staggered manner as shown in FIG. 1, it goes without saying that the relationship between the PC steel wire 6 and the through hole 7 must correspond in the ring portion.

<Effects of the Invention> In the method of the present invention, the lining is completed by sequentially repeating the above-mentioned joining method, but the joining in the axial direction of the tunnel is not done with a bolt donut or pin-tenon as in the past, but with PC steel. Since the wire applies prestress and tension, cracks are less likely to occur due to notches at the connecting surface of the ring part. Furthermore, since the concrete segments are integrally joined in the axial direction of the tunnel using prestressed steel, the entire concrete segment can withstand external pressure from the ground, resulting in a more solid structure than conventional partial joints.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway schematic diagram showing the joining method of the present invention, and FIG.
The figure is a vertical sectional view of the main part of the present invention, and FIG. 3 is a partially enlarged view of FIG. 2. 1... Concrete segment, 2... Main body of concrete segment, 3... Ring part of concrete segment, 4... End part of concrete segment, 5
... Rib part of concrete segment, 6. PCM wire, 7. Through hole, 9. Injection material.

Claims (1)

[Claims] In a segment joining method that connects segments in the circumferential direction and axial direction of the tunnel to line the inside of the tunnel, the joining in the axial direction of the tunnel has a required length at a required location of the ring part of one of the adjacent segments. Using a plurality of PC steel wires that were left and planted, the PC steel wires were penetrated into a through hole provided in the ring part of the other adjacent segment corresponding to the planted part of the PC steel wire, and A method for joining concrete segments, characterized in that the mutually adjacent segments are fixed by tensioning a PC steel wire.