JP2000230394A - Joint structure for concrete segment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a segment-joint structure wherewith manufacture of form is easy and works can be done efficiently while being free from section defection. SOLUTION: An insert metal fixture 3 having a bolt hole 3b attached to the end face of a segment 1A on one side of adjoining segments and an indented part 13 formed at the end face of the other segment 1B of the adjoining segments are fitted together. Then a bolt 17 is inserted into a bolt hole 15 which is provided so as to penetrate through the indented part 13 from the inside of the segment 1B, and the bolt is screwed down into the bolt hole 3b of the insert metal fixture 3, and thereby the adjoining segments are joined together.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a segment joint structure.

[0002]

2. Description of the Related Art As joint structures for connecting concrete segments in the axial direction of a tunnel, those using so-called through bolts combining long bolts and short bolts and those using so-called tenoned segments forming a concrete tenon are known. . FIG. 6 is an explanatory diagram for explaining a case using a through bolt (long bolt). As shown in FIG. 6, in the through bolt structure, the adjacent segments 31,
A bolt box 31a, 33a is formed in each of the bolts 33, and a bolt 35 is inserted between the bolt boxes 31a, 33a and fastened with nuts 37, 39.

As shown in FIG. 7, the segmented structure with a tenon has a convex male tenon 41 formed on one of adjacent segments and a concave female tenon 43 fitted on the male tenon on the other. Forming a male tenon 41 and a female tenon 43
Are fitted.

[0004]

However, each of the above-mentioned prior arts has the following problems. First, in the through-bolt structure, it is necessary to form a large number of bolt boxes in each segment, so that it takes time and cost to manufacture a mold. Further, since the cross-sectional defect becomes large and stress concentration occurs, it is necessary to design in consideration of these points, and the segment becomes large.
Further, when connecting the segments, it is necessary to tighten the nuts from both sides, which is troublesome and poor in workability.

In the segment structure with a tenon, a tenon is generally formed over the entire circumference of each segment. However, in order to form the tenon, a tenon shape is cut when a steel mold is manufactured. It is necessary to perform a machining process, which is troublesome and costly. In the case of a concrete tenon, since the strength of the concrete is not so high, it is necessary to increase its cross-sectional area. Therefore, there is a problem that the method can be applied only to a segment having a high digit height. Furthermore, in the case of connection by a tenon, there is no connection in the tunnel axial direction, and thus it is not suitable, for example, when the ground is loose and an axial displacement is considered.

As described above, in the conventional segment joint structure, both the through-bolt structure and the segment structure with the tenon are provided.
There is a common problem that it takes time and cost to manufacture the formwork, and there are inherent problems such as cross-section loss and workability in the through bolt structure, and furthermore, in the segment structure with tenon, it can only be applied to segments with high girder height In addition, there is an inherent problem that it is not suitable when the ground is loose.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to obtain a joint structure of a segment which is easy to manufacture a formwork, has no problem of cross-sectional defect, and has good workability. I have.

[0008]

According to the present invention, there is provided a segment joint structure for sequentially connecting end faces of a concrete segment in a tunnel axial direction, wherein a metal protrusion having a bolt hole provided at an end face of one adjacent segment is provided. The member and the concave portion formed on the end surface of the other adjacent segment are fitted together, and a bolt is inserted into a bolt hole provided so as to penetrate the concave portion from the inner surface side of the other segment. The adjacent segments are connected to each other by being screwed into holes.

[0009] Further, the bolt hole penetrating the concave portion is formed obliquely from the inner surface side of the other segment toward the concave portion.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a perspective view of a segment according to an embodiment of the present invention (a segment in this specification includes a segment piece). First, the overall configuration of a segment will be outlined based on FIG.

In the figure, reference numeral 1 denotes a segment, and 3 denotes a male tenon insert metal fitting which is provided at a predetermined interval on one end face (hereinafter, simply referred to as "end face") of the segment 1 in the tunnel axis direction. is there. Details of the insert 3 will be described later.

Reference numeral 5 denotes a bolt box for oblique bolts formed on the inner surface of the segment near the end face opposite to the end face on which the insert fitting 3 is installed in the segment 1. The bolt boxes 5 are formed in the number corresponding to the positions corresponding to the insert fittings 3. Numeral 7 is an injection hole that also serves as an erector hole to be gripped by the erector when assembling the segments and for injecting concrete. Reference numeral 9 denotes a seal member provided on the end face of the segment and the end face between the pieces.

FIG. 2 is a cross-sectional view of a joint between two segments 1A and 1B adjacent in the tunnel axis direction. Next, the detailed configuration of the segments and the joint structure will be described with reference to FIG. 11 is a reinforcing bar installed inside the segment. The insert fitting 3 is buried in the segment end face with a part of one end protruding from the segment end face.

FIG. 3 is a side view of the insert fitting 3, FIG. 4 is a view A in FIG. 3, and FIG. 5 is a view B in FIG. Here, the shape of the insert fitting 3 will be described. The insert fitting 3 has a rectangular head 3a formed on the base end side, and a circular shape with a larger diameter on the distal end side than the head 3a,
An oblique bolt hole 3b is formed in the end face. In addition, a tapered portion 3c whose diameter is reduced toward the tip is formed at the tip. Further, a reinforcing rib 3d is provided on the lower side of the insert fitting 3 from the base end side to the distal end side.

Next, the function of the insert fitting 3 will be described. The tip of the insert 3 functions as a male tenon, but since it is made of steel, its strength is higher than that of a conventional concrete tenon, so that the area of the tenon can be reduced. In addition, in the manufacture of the steel formwork, the insertion hole of the insert metal fitting 3 may be simply provided in the formwork, so that the time and effort as in the related art is not required, and the cost of manufacturing the formwork can be reduced.

Again, referring to FIG.
1 that is connected to the segment 1A where
The configuration of B will be described. A tapered recess 13 into which the tip of the insert fitting 3 is fitted is provided on the end face of the segment 1B.
Are formed. Although the recess 13 functions as a female tenon, as described above, the area thereof can be reduced by using a metal insert fitting as the male tenon, so that the area of the recess 13 is reduced. 1
The area around 3 can be increased, and the strength as a female tenon can be secured. For this reason, since the digit height is not required, the present invention can be applied to a segment having a small digit height.

Reference numeral 15 denotes a bolt insertion hole that penetrates from the bolt box 5 to the recess 13. Reference numeral 17 denotes a diagonal screw that is inserted from the bolt box 5 side toward the recess 13, and whose tip is screwed into the bolt hole 3 b of the insert fitting 3. Bolts
The segment 1A and the segment 1B are connected by a slant 17.

The procedure for connecting the segments configured as described above will be outlined. The position of the tip of the insert 3 of the segment 1A is aligned with the position of the recess 13 of the segment 1B, and the tip of the insert 3 and the recess 13 are fitted. At this time, the tip of the insert fitting 3 and the recess 13
Are formed in a tapered shape, so that smooth fitting is possible.

Next, a bolt is inserted from the bolt box 5 and screwed into a bolt hole 3b formed at the tip of the insert fitting 3 for fastening. As described above, the connection work is extremely simple, and the workability is excellent.

In the present embodiment, the tip of the insert fitting and the recess are tapered, so that the positioning is facilitated. In addition, since a bolt hole 3b is provided at an end of the insert fitting 3, and the insert fitting 3 has both functions of a male tenon and a bolt fastening part, the joint part by the borrow and the joint part by the bolt can be matched. The shear force generated between the adjacent segments can be basically covered by the tenon, and the bolt does not break due to shear.

[0021]

As described above, in the present invention,
The metal convex member having a bolt hole installed on the end surface of one adjacent segment and the concave portion formed on the end surface of the other adjacent segment are fitted to each other. It is only necessary to provide a hole in which a convex member functioning as a buried member can be embedded, which facilitates the production of a mold. In addition, by using a metal member as the convex member, the convex member can be reduced in area, and as a result, the concave portion can be reduced in area. Therefore, it is not necessary to increase the girder height so that the concave portion can function as a female tenon, and the present invention can be applied to a segment having a lower girder height. Further, since the adjacent segments are connected by inserting a bolt into a bolt hole provided so as to penetrate the concave portion from the inner surface side of the other segment and screwing the bolt into the bolt hole of the convex member, the bolt is connected. It only has to be inserted and screwed in, and the workability is extremely good.

Further, since the bolt hole penetrating the concave portion is formed obliquely from the inner surface side of the other segment toward the concave portion, the concave portion provided on the inner surface of the segment as a bolt box can be reduced in volume, and the cross section can be reduced. Defects can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of a segment according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a joint in an adjacent segment according to one embodiment of the present invention.

FIG. 3 is a side view of the insert according to the embodiment of the present invention.

FIG. 4 is a diagram viewed from the arrow A in FIG. 3;

FIG. 5 is a diagram viewed from an arrow B in FIG. 3;

FIG. 6 is an explanatory view of a conventional technique (through bolt structure).

FIG. 7 is an explanatory diagram of a conventional technology (segment structure with a tenon).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Segment 3 Insert fitting 3b Bolt hole 5 Bolt box 13 Recess

Claims (2)

[Claims] 1. A segment joint structure for sequentially connecting end faces of a concrete segment in a tunnel axial direction, comprising: a metal convex member having a bolt hole installed on an end face of one adjacent segment; The adjacent segments are fitted by fitting the formed recesses and inserting bolts into bolt holes provided to penetrate the recesses from the inner surface side of the other segment and screwing into bolt holes of the convex member. A joint structure for concrete segments, characterized in that they are interconnected. 2. The concrete segment joining structure according to claim 1, wherein a bolt hole penetrating the concave portion is formed obliquely from an inner surface side of the other segment toward the concave portion.