JPH1082290A - Rectangular concrete segment and joining structure thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reinforce a joining force against the pressure directed outward from the center of a tunnel. SOLUTION: Two rectangular concrete segments 1 are arranged to butt their mutual end joining faces 1c and 1d so that they may be connected to each other in the shape of a ring where one side joining face 1a of another rectangular concrete segment is arranged to butt the side joining faces 1b and 1c on one side of the two rectangular concrete segments 1 while a joining pin 3a provided on one steel-made plate 3 forming the side joining face 1a is fitted into a joining hole 4a provided on the other steel-made plate 4. The screw of a joining bolt inserted into an Insertion hole of one rectangular concrete segment 1 is screwed into the screwed hole of the joining bolt 6 inserted into the insertion hole of the other rectangular concrete segment 1 and integrally joined staggeringly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a rectangular concrete segment used for constructing a tunnel-like wall or the like,
And a joint structure between rectangular concrete segments.

[0002]

2. Description of the Related Art When a large number of segments are joined together to construct, for example, a tunnel wall, joint fittings are generally embedded in the joining surfaces of the segments, bolts are inserted through holes in the joint fittings, and nuts are inserted. Adjacent segments are joined together by screwing and fastening the fittings together.

[0003]

The above-described conventional joint structure of segments has sufficient strength against the pressure of earth and sand applied from the outside of the tunnel toward the center. There is a problem that the joining force to the water pressure toward the direction is weak, and the water leaks easily.

[0004] It is an object of the present invention to provide a rectangular concrete segment capable of providing a strong bonding force against a pressure outward from the center of the tunnel.

[0005] It is another object of the present invention to provide a joint structure of rigidly joined rectangular concrete segments.

[0006]

In order to achieve the above object, a rectangular concrete segment according to the present invention is provided with steel plates formed on the left and right circular arc-shaped side portions of a concrete slab by forming side joint surfaces. A joining pin protrudes from an outer surface of the one steel plate, and a joining hole is provided in the other steel plate for fitting a joining pin of another rectangular concrete segment in a staggered arrangement. In the above, it is possible to adopt a configuration in which an insertion hole through which the joining bolt is inserted is provided through both the steel plates and the concrete plate.

The joint structure of the rectangular concrete segments according to the present invention is formed by joining a plurality of end joining surfaces of each other to form a ring shape, and any two of the rectangular concrete segments having the above structure. The other one of the rectangular concrete segments having the above-mentioned configuration is joined to the segment, and a side joint surface of one side thereof is brought into contact with a side joint surface of one side of the two rectangular concrete segments connected in a ring shape. A joining pin provided on the other steel plate was fitted into a joining hole provided on one steel plate having a side joining surface, and joined. In this case, the joining bolts can be inserted into the insertion holes of the rectangular concrete segments and screwed to each other.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on embodiments with reference to the drawings. 1 to 4 show one embodiment of a rectangular concrete segment and a joint structure thereof according to the present invention. In these figures, reference numeral 1 denotes a rectangular concrete segment, and a steel plate 3 having a joining pin 3a protruding and a steel plate 4 having a joining hole 4a formed on the left and right arc-shaped side portions of a reinforced concrete plate 2. Each of the steel plates 3 and 4 and the concrete plate 2 are provided with an insertion hole 1e. The joint hole 4a extends into the concrete slab 2. Reference numerals 1c and 1d are end joining surfaces.

The steel plates 3 and 4 form side joint surfaces 1a and 1b of the rectangular concrete segment 1,
Concrete slab 2 with dowels welded to them
To increase the tensile strength and the bending strength of the rectangular concrete segment 1.

As shown in FIG. 3, the joining pin 3a is fitted into the joining hole 4a of the other rectangular concrete segment 1, and the outer diameter of the joining pin 3a is fitted into the joining hole 4a without looseness. The tip is formed to be approximately the same as the inner diameter of the connecting hole 4a, and the tip is tapered to facilitate the fitting into the joining hole 4a.

The joining pin 3a and the joining hole 4a are
In the longitudinal direction of the steel plates 3, 4, the steel plates 3, 4
At intervals of 1/4 of the length of the steel plates 3 and 4
1 are provided symmetrically with respect to the intermediate line L in the length direction of FIG.

Accordingly, the two rectangular concrete segments 1, 1 are connected to their end joining surfaces 1c, 1c, 1c.
d, 1d are aligned in a straight line, and the side joint surfaces 1a,
1b can be joined in parallel, or one rectangular concrete segment 1 can be joined to two rectangular concrete segments 1, 1 joined in a ring shape by joining end joining surfaces 1c, 1d. The joining surface 1a is abutted against the side joining surfaces 1b, 1b of the two rectangular concrete segments 1, 1 and two joining holes 4a of the two rectangular concrete segments 1, 1 or one of the two One joint hole 4a of the rectangular concrete segment 1 and 3 of another rectangular concrete segment 1
The four joining pins 3a can be fitted into the individual joining holes 4a and joined in a staggered manner.

If the above staggered joining is possible, the joining pins 3
The number and arrangement of the “a” and the joining holes 4 a are not limited to the embodiment shown in the drawings, but may be changed arbitrarily.

The insertion holes 1e are for inserting the connection bolts 6, and are provided at two intermediate positions between the connection pins 3a and the connection holes 4a at the end and the connection pins 3a and the connection holes 4a inside them. .

For this reason, the rectangular concrete segment 1
In both the parallel joining and the former staggered joining, the insertion holes 1e and 1e of the two rectangular concrete segments 1 and 1 communicate with each other in a straight line. The number and the arrangement of the insertion holes 1e are not limited to the embodiment shown in the drawing, as in the case of the joining pins 3a and the like, and may be variously changed.

The joining bolt 6 has a screw 6a at one end and a large-diameter head 6c having a screw hole 6b at the other end. As shown in FIG. 4, the joining bolt 6 is inserted into the insertion hole 1 e of the rectangular concrete segment 1, and is inserted into the screw hole 6 b of the other joining bolt 6 inserted into the insertion hole 1 e of the other rectangular concrete segment 1. The screws 6a are screwed together and integrally connected to join the two rectangular concrete segments 1 and 1 together.

In order to construct a tunnel by joining the rectangular concrete segments 1 having the above-described structure, a plurality of end joining surfaces 1c and 1d are joined to each other and connected to form a ring. One of the two rectangular concrete segments 1 and 1 is connected to the other one of the rectangular concrete segments 1 by a side joint surface 1a (or 1).
b) is connected to the side joint surfaces 1b, 1b (or 1) on one side of the two rectangular concrete segments 1, 1 in a ring connection.
a, 1a) and the side joint surface 1
a into the joining pin 3a provided in one steel plate 3 and the joining hole 4a provided in the other steel plate 4.
And one rectangular concrete segment 1
Screw 6a of the joining bolt 6 inserted through the insertion hole 1e of
The other rectangular concrete segment 1 is screwed into the screw hole 6b of the joining bolt 6 inserted into the insertion hole 1e of the other rectangular concrete segment 1 and integrally joined in a staggered manner.

FIGS. 5 and 6 show examples of the most common staggered joining. In FIG. 5, the upper side is the wellhead side, and the lower side is the face side.

In the staggered joint structure shown in FIGS. 5 and 6,
The steel plates 3, 3 (or 4, 4) on one side of the two rectangular concrete segments 1, 1 connected in a ring shape with the end joining surfaces 1c, 1d abutting each other are connected to the rectangular concrete segments 1, 1 respectively. Are joined by the steel plate 4 (or 3) of another rectangular concrete segment 1 joined by joining the side joining surfaces 1b (or 1a) to the side joining surfaces 1a, 1a (or 1b, 1b). In addition, a strong bonding force can be obtained against a pressure directed outward from the center of the tunnel. Further, since the steel plates 3 and 4 are provided on the side of the concrete slab 2, the strength of the segment 1 itself is high.

The present invention is not limited to the above embodiment, but can be modified as follows, for example. That is, as shown in FIG. 7, both or one of the steel plates 3 and 4 can be channel steel. In this case, the flanges 3f and 4f are arranged on the surface of the concrete slab 2.

The height of the steel plates 3 and 4 in FIG. 7 is the same as the thickness of the concrete slab 2.
For example, as shown in FIG. 8, the height of one or both of the steel plates 3 and 4 can be made smaller than the thickness of the concrete slab 2. This is the same for the flat steel plates 3 and 4 shown in FIG.

In the embodiment shown in the figure, one steel plate 3 is provided with only the joining pins 3a, and the other steel plate 4 is provided with only the joining holes 4a. 4 can also be provided with a joining pin and a joining hole, respectively.

If necessary, at least one groove is provided on the outer periphery of the rectangular concrete segment 1, and a water-stop packing is fitted into the groove to increase the water-stop performance.

[0024]

As described above, in the rectangular concrete segment according to the present invention, the steel plates are provided on the left and right arc-shaped side portions of the concrete slab so as to form the side joint surfaces. A joining pin protrudes from the outer surface of the plate, and a joining hole is provided on the other steel plate for joining a joining pin of another rectangular concrete segment arranged in a staggered manner. The steel plates can be firmly connected to each other in a ring shape by the fitting. Therefore, a strong joining force is obtained, and it can be used for lining a tunnel which is a waterway. Further, since the steel plate increases the strength of the segment itself, a strong tunnel can be constructed.

When the insertion holes through which the joining bolts are inserted are formed by penetrating the steel plates and the concrete plate, it is possible to surely join the rings between the segments.

Further, the joint structure of the rectangular concrete segments according to the present invention is formed by joining a plurality of end joining surfaces to each other to form a ring shape, and any two of the rectangular concrete segments having the above-described structure. The other one of the rectangular concrete segments having the above-described configuration has one side joining surface thereof abutted against one side joining surface of the two rectangular concrete segments in a ring-like connection. Since the joining holes provided in one steel plate forming the side joining surfaces are joined by joining the joining pins provided in the other steel plate, the tunnel of the water channel is formed. It can withstand water pressure and prevent water leakage.

If the joining bolts are inserted into the insertion holes of the rectangular concrete segments and screwed to each other, the segments are firmly joined between the rings, so that the joining pins do not come off from the joining holes. .

[Brief description of the drawings]

FIG. 1 is a partially broken front view showing an embodiment of a rectangular concrete segment according to the present invention.

FIG. 2 is an external view of the rectangular concrete segment of FIG.

FIG. 3 is a cross-sectional view showing a state where a joining pin is fitted into a joining hole.

FIG. 4 is a cross-sectional view showing a screwed state of the joining bolts.

FIG. 5 is a schematic view showing a staggered joining state of rectangular concrete segments.

FIG. 6 is also an external view.

FIG. 7 is a cross-sectional view of a rectangular concrete segment according to the present invention using a steel plate as a channel steel.

FIG. 8 is a cross-sectional view of a rectangular concrete segment according to the present invention in which a channel steel having a height smaller than the thickness of a concrete slab is made of a steel plate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rectangular concrete segment 1a, 1b Side connection surface 1c, 1d End connection surface 1e Insertion hole 2 Concrete plate 3 Steel plate 3a Connection pin 4 Steel plate 4a Connection hole 6 Connection bolt

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Koji Shiraishi, Inventor Koji Shiraishi 2-2-2 Matsuzaki-cho, Abeno-ku, Osaka-shi, Japan Okumura Gumi Co., Ltd. (72) Inventor Hiroki Someya 2-6-12, Yaesu, Chuo-ku, Tokyo (72) Inventor Akio Hashiguchi 2-6-21, Yaesu, Chuo-ku, Tokyo Inside Ishikawajima Construction Materials Industry Co., Ltd.

Claims (4)

[Claims] 1. A steel plate is formed on left and right arc-shaped side portions of a concrete slab so as to form a side joint surface. A joint pin is projected from an outer surface of the one steel plate, and the other steel plate is formed. A rectangular concrete segment having a joint hole into which a joint pin of another rectangular concrete segment arranged in a staggered manner is fitted. 2. The rectangular concrete segment according to claim 1, wherein an insertion hole through which the joining bolt is inserted is provided through the steel plates and the concrete slab. 3. The joining structure of rectangular concrete segments according to claim 1, wherein a plurality of end joining surfaces are joined to each other and connected to form a ring. One or two rectangular concrete segments, another rectangular concrete segment,
The one side joint surface is abutted with the one side joint surface of the two rectangular concrete segments of the ring-shaped connection, and is provided on one steel plate forming the side joint surface. A joining structure of rectangular concrete segments, wherein a joining pin provided on the other steel plate is fitted into the joining hole and joined. 4. The joining structure of a rectangular concrete segment according to claim 3, wherein the joining bolts inserted into the insertion holes of the rectangular concrete segments are screwed to each other.