JPH11229790A - Segment and working hole blocking structure for segment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the corrosion of a tubular member, in which a grout hole is formed, due to circulating liquid. SOLUTION: Grout material G is filled from a grout hole (h) in a segment 1, and then the threaded portion 4a of a blocking member 4 is threaded into a threaded hole 3a in a tubular member 3 and the blocking member 4 is fastened until the top 4e of the blocking member 4 corresponds to the inner face 1a of the segment 1 to block the grout hole (h). A seal ring 5 is strongly pushed against an inside hole 1b at the head 4b and put in liquid tightness in this area. Circulating liquid such as water flowing in a cylindrical wall contacts the tubular member 3 which is then prevented from corrosion. As there is no roughness on the inner wall of the cylindrical wall, the circulating liquid smoothly flows without causing stay or turbulence.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a segment used for constructing an underground pipe and the like and a structure for closing a working hole in the segment.

[0002]

2. Description of the Related Art As a method of constructing an underground sewer such as a tunnel or a water channel, a so-called shield method is generally used, in which a segment is assembled in an excavated pit to construct a cylindrical wall. In this shield method, a segment formed in an arc shape is used for primary lining of an underground pipe, and this segment is assembled in an excavation pit to construct a cylindrical wall.

[0003] After the cylindrical wall is constructed in the excavation pit, concrete grout is injected and filled into the gap between the wall of the excavation pit and the outer surface of the cylindrical wall to integrate the ground and the cylindrical wall. Plan. Therefore, as shown in FIG. 4, a grout hole ha for grouting the grout material G is provided substantially at the center of the segment 21.
Are provided so as to penetrate in the thickness direction. The grout hole ha has an outer tapered inner hole 21b opened on the inner surface 21a of the segment 21 and an outer tapered outer hole 21d opened on the outer surface 21c of the segment 21.
And a steel tubular member 23 buried in the segment 21 between the inner hole 21b and the outer hole 21d with both ends communicating with the inner ends thereof.

[0004] Then, in the above grout hole ha,
Screw portion 24a screwed into screw hole 23a of tubular member 23
A closing member 24 provided with a hemispherical head 24b is attached to the end of the tubular member 23 by screwing a screw portion 24a into a screw hole 23a of the tubular member 23 and tightening the closing member 24. Put the attached seal ring 25 on the head 2
The grout hole ha can be closed by the closing member 24 in a liquid-tight manner by compression at 4b. Symbol 24c
Is a rotary operation unit, which is a closing member 24 with a box spanner or the like.
It is for turning.

[0005]

In the conventional grout hole closing structure shown in FIG. 4, the seal ring 25 merely seals the screw hole 23a of the tubular member 23 in a liquid-tight manner so that water or the like flowing through the sewer can be removed. The contact of the flowing liquid with the tubular member 23 cannot be prevented. Therefore, there is a problem that the tubular member 23 is corroded by the flowing liquid depending on the type of the flowing liquid.

The conventional hemispherical head 2 of the closing member 24
4b is extremely smaller than the inner hole 21b as shown in FIG. 4, and when the grout hole ha is closed by the closing member 24, most of the inner hole 21b is left as it is and is opened on the inner surface 21a of the segment 21. However, there is a problem that the flow of the flowing liquid is hindered by the unevenness formed in the inner hole 21b, and the flowing liquid stays in the inner hole 21b.

It is an object of the present invention to provide a segment capable of preventing corrosion of a tubular member by a flowing liquid and a structure for closing a working hole in the segment. It is another object of the present invention to provide a segment in which the flow of the flowing liquid is not hindered by the inner hole or the flowing liquid stays in the inner hole, and a structure for closing the working hole in the segment.

[0008]

To achieve at least one of the above objects, a segment according to claim 1 comprises:
An outer wide tapered inner hole opened on the inner surface and a working hole such as a grout hole mainly composed of a tubular member provided with one end communicating with the inner end of the inner hole are provided in the thickness direction. In a segment for constructing a sewer having a closing member provided with a head in a screw portion screwed into a screw hole of the tubular member in the hole, the head of the closing member is connected to an inner hole of the working hole. The outer peripheral surface of the head is provided with a seal ring which is pressed against the inner peripheral surface of the inner hole to make the portion liquid-tight.

In the above means, when the screw portion is screwed into the screw hole of the tubular member and the closing member is tightened, the seal ring is compressed between the outer peripheral surface of the head and the inner peripheral surface of the inner hole. Make the part liquid tight. Therefore, the flowing liquid does not touch the tubular member. Since the seal ring is mounted on the closing member, it is difficult for the seal ring to drop off from the closing member.

In the above segment, it is preferable that the top surface of the head of the closing member is formed in an arc shape which is flush with the inner surface of the segment when the working hole is closed by the closing member. . In this configuration, the head of the closing member is tightly fitted into the inner hole without leaving any space,
The cross section of the culvert at that portion is made the same as the cross section of the other part. The top surface of the head of the closing member may be formed in a flat shape that is substantially flush with the inner surface of the segment when the working hole is closed by the closing member. In this case, the head of the closing member is fitted into the inner hole, and the cross sectional shape of the culvert at that portion is made substantially the same as the cross sectional shape of the other part. Since the top surface of the head is flat, no trouble is required in manufacturing the closing member.

It is desirable that the seal ring be provided so as to be fitted in a groove formed on the outer peripheral surface of the head of the closing member. With this configuration, the seal ring is correctly compressed at a predetermined position.

According to a fifth aspect of the present invention, the working hole closing structure in the segment mainly comprises a tapered inner hole which is open on the inner surface and a tubular member provided with one end communicating with the inner end of the inner hole. A closing member having a threaded portion having a tapered head substantially matching the inner hole of the working hole is screwed into a threaded hole of a tubular member of the working hole. At the same time, a seal ring was attached between the outer peripheral surface of the head and the inner peripheral surface of the inner hole by liquid-tight compression.

In the above means, contact of the flowing liquid with the tubular member is prevented by the seal ring which is liquid-tightly compressed on the inner peripheral surface of the inner hole by the outer peripheral surface of the tapered head of the closing member.

In the structure for closing the working hole in the segment, the closing member may be the closing member according to any one of claims 1 to 4, wherein a seal ring is mounted on an outer peripheral surface of the head. Claim 6). Alternatively, the seal ring may be mounted on the inner peripheral surface of the inner hole, or may be simply inserted and compressed between the outer peripheral surface of the head and the inner peripheral surface of the inner hole.

[0015]

Embodiments of the present invention will be described with reference to the drawings. FIGS. 1 to 3 show an embodiment of the present invention. A grout hole (working hole) h for injecting grout material G is provided substantially in the center of a segment 1 so as to penetrate in the thickness direction. I have. This grout hole h
As in the case of the grout hole ha of FIG. 4, the tapered inner hole 1b which is open on the inner surface 1a of the segment 1, the tapered outer hole 1d which is open on the outer surface 1c of the segment 1, and the inner hole A tubular member 3 buried in the concrete of the segment 1 is provided between the inner end of the segment 1b and the outer hole 1d so that both ends thereof are linearly communicated with each other. The tubular member 3 is made of metal such as steel,
Is welded to the reinforcing bar 1e.

Reference numeral 4 denotes a closing member, which is made of resin or the like. The closing member 4 closes the grout hole h after injecting and filling the grout material G from the grout hole h between the ground wall and the cylindrical wall constructed in the excavation pit by the many segments 1. , Tubular member 3
The screw portion 4a screwed into the screw hole 3a of the
Is provided with a tapered head 4b corresponding to the inner hole 1b.

On the outer peripheral surface of the head 4b of the closing member 4, a groove 4d is formed concentrically with the screw portion 4a and the head 4b of the closing member 4, and the groove 4d is made of an elastic material such as rubber. A seal ring 5 such as an O-ring is fitted. The top surface (inner end surface) 4e of the head 4b of the closing member 4 is the segment 1 when the grout hole h is closed by the closing member 4.
Is formed in the shape of a circular arc having the same curvature as the inner surface 1a (same surface) as the inner surface 1a, and a square-shaped rotary operation part 4 into which a square projection of a rotary operation tool (not shown) such as a wrench is fitted.
c is formed. After closing the grout hole h with the closing member 4, the rotary operation portion 4c is flattened by fitting a separately prepared fitting member 4f.

As is well known, a large number of the segments 1 having the above-described structure are combined to form a cylindrical wall in an excavation pit, and a grout hole G is inserted between the cylindrical wall and the ground through a grout hole h. Is injected and filled. Immediately after the grout material G is injected and filled, the screw portion 4a of the closing member 4 is screwed into the screw hole 3a of the tubular member 3, and the closing member 4 is rotated until the top surface 4e of the closing member 4 coincides with the inner surface 1a of the segment 1. The grout hole h is closed with the closing member 4 by tightening with an operating tool. Thereafter, the fitting member 4f is fitted to the rotation operation unit 4c.

By the above-mentioned tightening operation of the closing member 4, the seal ring 5 is strongly pressed by the outer peripheral surface of the head 4b against the inner peripheral surface of the inner hole 1b, and the portion is liquid-tight.
Therefore, the flowing liquid such as water flowing in the cylindrical wall body does not contact the tubular member 3 to corrode it, and the loosening rotation of the closing member 4 is prevented by the expansion restoring force of the compression seal ring 5.

The outer peripheral surface of the head 4b of the closing member 4 and the inner peripheral surface of the inner hole 1b are shaped so as to be narrowed from the center of the cylindrical wall toward the ground, and the pressure of the flowing liquid causes Since the outer peripheral surface of the closing member head 4b is configured to be pressed against the inner peripheral surface of the inner hole 1b, good water stoppage can be obtained.

Further, the top surface 4e of the closing member 4 is flush with the inner surface 1a of the segment 1, and does not form any irregularities on the inner wall surface of the cylindrical wall. It will flow smoothly without doing.

Further, since the seal ring 5 is fitted into the groove 4d of the closing member 4 and does not fall off from the closing member 4, the work of closing the grout hole h by the closing member 4 is easy. In addition, since the seal ring 5 does not shift from a predetermined position when the closing member 4 is tightened, the degree of sealing is constant.

Although the rotary operation section 4c in the figure is a square, it may have another shape, for example, a hexagon. When the rotary operation part 4c is formed into a shape other than the one shown in the drawing, the shape of the fitting member 4f is adjusted to that shape.

The top surface 4e of the closing member 4 is
As indicated by the dashed line, when the grout hole h is closed by the closing member 4, the segment 1 may be formed to be substantially flush with the inner surface 1a of the segment 1. This makes it easier to manufacture the closing member 4 as compared with the case where the top surface 4e is formed in an arc shape, does not require labor, and is advantageous in terms of cost.

The materials of the tubular member 3 and the closing member 4 are not limited to the above-mentioned metal such as steel or a synthetic resin, but are determined in consideration of strength, corrosion resistance, cost and the like. In addition, the seal ring 5 can be attached to the closing member 4 by another method such as attaching to the closing member 4 with an adhesive. In some cases, a groove is provided in the inner peripheral surface of the inner hole 1b. It may be configured to be mounted or simply inserted between the outer peripheral surface of the head 4b and the inner peripheral surface of the inner hole 1b and compressed.

The outer hole 1d of the segment 1 makes the diffusion of the grout material G around the periphery good, and its shape is arbitrary and may not be formed.

In the segment 1, in addition to the grout hole h, a tubular member 3 or a similar member may be buried in concrete as a nut member for transportation (however, in this case, FIG. Is usually closed by a lid.) The closing member 4 of the present invention
It can also be used for closing the nut member as described above.

[0028]

As described above, the segment according to the first aspect includes a tapered inner hole which is open on the inner surface and a tubular member provided with one end communicating with the inner end of the inner hole. A sewer construction in which a working hole such as a grout hole as a main body is provided in the thickness direction, and the working hole is provided with a closing member provided with a head portion in a screw portion screwed into the screw hole of the tubular member. In the segment for, the head of the closing member is formed in a tapered shape substantially matching the inner hole of the working hole,
The outer peripheral surface of the head is provided with a seal ring that is pressed against the inner peripheral surface of the inner hole to make the portion liquid-tight, so that the contact of the circulating liquid to the tubular member is cut off by the seal ring. be able to. Therefore, corrosion of the tubular member by the flowing liquid can be prevented. In addition, since the seal ring is attached to the closing member and does not easily fall off the closing member, there is an advantage that the work of closing the grout hole can be easily performed.

In the above segment, if the top surface of the head of the closing member is formed in an arc shape which is flush with the inner surface of the segment when the working hole is closed by the closing member, Since unevenness is not formed in the hole portion, it is possible to construct a pipe with good performance in which the flowing liquid flows smoothly without stagnation or turbulence.

When the top surface of the head of the closing member is formed to be substantially flush with the inner surface of the segment when the working hole is closed by the closing member, substantially the same effect as described above can be obtained. In addition, it is possible to obtain a segment that is easy to manufacture the closing member and that is inexpensive. In addition, when the seal ring is configured to be fitted in a groove formed on the outer peripheral surface of the head of the closing member, the reliability of the seal is improved because the seal ring is correctly compressed at a predetermined position.
There is an effect that the mounting of the seal ring on the closing member is facilitated.

According to a fifth aspect of the present invention, the working hole closing structure of the segment mainly comprises a tapered inner hole which is open on the inner surface and a tubular member provided with one end communicating with the inner end of the inner hole. In a working hole such as a grout hole, a closing member provided with a tapered head in a screw portion that substantially matches the inside hole of the working hole screws the screw portion into a screw hole of a tubular member of the working hole. In addition, since the seal ring is liquid-tightly compressed and attached between the outer peripheral surface of the head and the inner peripheral surface of the inner hole, the tubular member is eroded by contact with the flowing liquid. There is no. Therefore, a sewer with a long service life can be constructed.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part showing an embodiment of the present invention.

FIG. 2 is an external view of a closing member of FIG.

FIG. 3 is a front view of the head of the closing member of FIG. 1;

FIG. 4 is a cross-sectional view showing a grout hole closing structure in a conventional segment.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 segment 1a inner surface 1b inner hole 3 tubular member 3a screw hole 4 closing member 4a screw portion 4b head 4d groove 4e top surface 5 seal ring h grout hole (work hole) G grout material

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Koji Shiraishi, Inventor Koji Shiraishi 2-2-2, Matsuzakicho, Abeno-ku, Osaka-shi, Osaka Okumura Gumi Co., Ltd. (72) Inventor Hiroki Someya 1-12-1, Yurakucho, Chiyoda-ku, Tokyo (72) Inventor Akio Hashiguchi 1-12-1 Yurakucho, Chiyoda-ku, Tokyo Inside Ishikawashima Building Materials Co., Ltd.

Claims (6)

[Claims] A work hole such as a grout hole mainly composed of a tubular member provided with one end communicating with an inner end of the inner hole and an inner end of the inner hole which is open to the outside is formed in the thickness direction. Provided in the working hole, in a segment for constructing a sewer having a closing member provided with a head in a screw portion screwed into the screw hole of the tubular member, wherein the head of the closing member is A seal ring which is formed in a tapered shape substantially coinciding with an inner hole of the working hole, and is mounted on an outer peripheral surface of the head portion by being pressed against an inner peripheral surface of the inner hole to make the portion liquid-tight. Segment to be used. 2. The segment according to claim 1, wherein the top surface of the head of the closing member is formed in an arc shape that is flush with the inner surface of the segment when the working hole is closed by the closing member. 3. The top surface of the head of the closing member is formed to be substantially flush with the inner surface of the segment when the working hole is closed by the closing member.
The described segment. 4. The segment according to claim 1, wherein the seal ring is provided so as to be fitted in a groove formed on an outer peripheral surface of a head of the closing member. 5. A working hole such as a grout hole mainly composed of a tubular member provided with one end communicating with an inner end of the inner hole and an inner end of the inner hole which is open to the outside. A blocking member provided with a tapered head in the screw portion substantially matching the inner hole of the screw hole allows the screw portion to be screwed into the screw hole of the tubular member of the working hole, and the outer peripheral surface of the head and the inner hole of the inner hole are screwed. A structure for closing a working hole in a segment, wherein a seal ring is mounted in a liquid-tight manner between the inner ring and a seal ring. 6. The segment according to claim 5, wherein the closing member is the closing member according to any one of claims 1 to 4, wherein a sealing ring is mounted on an outer peripheral surface of a head. Work hole closure structure.