JPH08177393A - Shield segment - Google Patents

Abstract

(57) [Summary] [Purpose] The structure of the joint part of the shield segment used for the shield construction is a single bolt type, and there are structural weak points or cracks occur at the contact points of the segment and the bolt box. As a result, water leakage can be reduced by half, the labor of combining the bolt and the nut can be eliminated, and the workability can be maintained such that fastening failure due to co-rotation of the bolt and the nut can be eliminated. [Structure] One shield segment 1 to be joined to each other
A bolt box 2 is formed inside the joint plate 3 in which the bolt insertion hole 5 is formed, and a female screw hole 7 formed by an embedded screw pipe 6 is formed on the joint surface of the opposite shield segment 1 on the joint surface. , Both are joined with the joint bolt 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield segment used for shield work, and more particularly to a shield segment having an improved joint portion.

[0002]

2. Description of the Related Art In the construction of underground structure tunnels for railways, underpasses, water and sewage systems, electric power, communication telephones, etc., an assembled type lining segment for primary lining, a so-called shield segment is used. In the shield construction method, this shield segment is a space inside the tail of a shield excavator that excavates in a circular shape and is assembled in an annular shape to form the inner wall of the tunnel. There is.

The structure of the shield segment 1 made of concrete will be described with reference to FIG. A bolt box 2 is provided in the. Further, the backfill injection hole 8 is provided so as to penetrate the surface parallel to the inner wall when the segment is annularly installed. Although illustration is omitted, this joint plate 3 has an anchor, and is embedded and set when the frame of the shield segment 1 is formed.

As shown in FIG. 4, the shield segment 1 is joined by inserting the joint bolt 4 into the bolt insertion hole 5 of the joint plate 3 while leaving the bolt head 4a side in the bolt box 2 of the joint portion of one shield segment 1. Then, the tip of the joint bolt 4 is inserted as it is into the bolt insertion hole 5 of the joint plate 3 provided in the bolt box 2 of the other shield segment 1 opposite thereto, and is screwed and fastened to the joint nut 9 here.

[0005]

However, in this conventional shield segment, the section where the bolt box is provided has a thin cross section, which is a structural weak point. Further, since there is a bolt box, cracks are likely to occur at the contact portion between the segment and the bolt box, causing water leakage. Further, since the nuts are used for fastening, it takes time and effort to combine the bolts and the nuts, and co-rotation between the bolts and the nuts easily occurs.

The object of the present invention is to eliminate the disadvantages of the conventional example described above, review the structure of the shield segment, and halve the water leakage resulting from the weakness after construction and the ease with which cracks occur due to the structure of the shield segment, Another object of the present invention is to provide a shield segment having improved workability and work efficiency in joining the shield segments.

[0007]

According to the present invention, in order to achieve the above object, the joint surface of one shield segment of the shield segments to be connected to each other has a bolt box formed inside a joint plate having a bolt insertion hole. The gist of the invention is that a female screw hole is formed in the joint surface of the other shield segment by an embedded screw pipe.

[0008]

According to the present invention, both shield segments are joined by inserting the joint bolt into the bolt insertion hole of the joint plate provided in the bolt box of the one shield segment, and joining the joints of the segments where the tips of the joint bolts face each other. The surface is screwed into the female screw hole by the embedded screw tube, and is fastened to the embedded screw tube to complete the joining.

As a result, the cross-section missing portion of the shield segment due to the bolt box is halved as compared with the conventional one.
The end of the shield segment is strengthened, the strength of the joint is increased, the number of cracks that are likely to occur in this part is reduced, and the risk of water leakage is reduced by half.

Further, by using the embedded screw tube,
The co-rotation by the bolt and the nut is eliminated, and the workability is significantly improved, and when there is no secondary lining, the filling material filling the inside of the bolt box for the purpose of preventing the corrosion of the bolt and the nut is halved, and the cost is reduced.

[0011]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a vertical sectional side view of an essential part showing one embodiment of a concrete shield segment of the present invention, and FIG. 2 is a perspective view, in which the same components as those of the conventional example are designated by the same reference numerals.

Bolt insertion holes 5 are formed on each of the vertical and horizontal joint surfaces of the shield segment 1, and the bolt box 2 is concreted inside the joint plate 3 provided by welding side plates and anchor bars. It is formed by removing the box when placing. If necessary, the joint plate 3 may be provided on the entire circumference of the shield segment.

Further, a female screw hole 7 made of a metal embedded screw pipe 6 is formed on the joint surface of the other shield segment 1 which faces the other shield segment 1. A joint plate may be provided around the embedded screw tube 6. Further, the embedded screw pipe 6 may have an anchor, and it is also conceivable to directly weld it to the reinforcing bar instead of the anchor.

Further, a backfill injection hole 8 is provided so as to penetrate a surface which is parallel to the inner wall when the shield segment 1 is installed.

To join the shield segments 1 to each other, the joint bolt 4 is inserted into the bolt insertion hole 5 of the joint plate 3 while leaving the head 4a side in the bolt box 2 of the joint portion of one shield segment 1, and the joint bolt is directly attached. The tip end of 4 is screwed into the female screw hole 7 of the other shield segment 1 which is opposite to the other, and the embedded screw pipe 6 and the joint plate 3 are fastened.

In the above embodiment, both the bolt box 2 having the joint plate 3 and the female screw hole 7 are provided in one sealed segment 1, but the joint surface structure is all bolt box type. Shield segment, or
It is also possible to combine it with a shield segment that is a female screw hole type with all embedded screw tubes.

[0017]

As described above, in the shield segment of the present invention, the bolt box of the joint portion is located on one side of the bolt as compared with the conventional shield segment, so that it is a weak point in structure. Also, the occurrence of cracks at the contact points between the segments and the bolt box and water leakage is reduced by half.

Further, it is possible to maintain the superiority of workability such as eliminating the trouble of assembling the bolt and the nut and eliminating the fastening failure due to the co-rotation of the bolt and the nut.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional side view of essential parts showing one embodiment of a shield segment of the present invention.

FIG. 2 is a perspective view showing an embodiment of the shield segment of the present invention.

FIG. 3 is a perspective view showing a conventional example.

FIG. 4 is a vertical sectional side view showing a joined state of a conventional shield segment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Shield segment 2 ... Bolt box 3 ... Joint plate 4 ... Joint bolt 4a ... Bolt head 5 ... Bolt insertion hole 6 ... Embedded screw tube 7 ... Female screw hole 8 ... Back-filling injection hole 9 ... Joint nut

Claims (1)

[Claims] 1. The joint surface of one shield segment of the shield segments to be joined to each other forms a bolt box inside a joint plate having a bolt insertion hole, and the joint surface of the other shield segment is formed by an embedded screw pipe. A shield segment having a female screw hole.