JP2002188400A - Cut-off structure for joint in buried conduit, and method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cut-off structure for a joint capable of stopping water at a joint part in a tunnel and speedily draining it downward by a simple structure and at easy workability. SOLUTION: To end edge parts of segments 12 and 12 positioned to face each other on both sides of a joint 18, recessed locking grooves 28 and 28 opened toward the joint are formed. A sheet type cover plate 30 which can be curved or bent at a center part is curved or bent to insert width direction end edge parts 42 and 424 of the cover plate 30 to opening parts in the locking grooves 28 and 28 formed on both sides of the joint 18 to close the joint with the cover plate 30. A water introducing passage is simultaneously formed by the joint 18 positioned on the outer circumferential side of the cover plate 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a tunnel such as a shield tunnel or a box culvert tunnel, a shield tunnel for a cable, or a variety of underground pipelines having a wall formed by abutting a plurality of segments made of concrete or the like. In connection with joint stoppage technology, in particular, it is possible to prevent water leakage from a joint into a pipeline with a simple structure and excellent workability, and to drain water on the outer peripheral side of the wall quickly downward. The present invention relates to a joint water-stop structure and a joint water-stop method for a newly constructed underground pipeline.

[0002]

BACKGROUND ART Conventionally, various underground pipelines such as shield tunnels, box culvert tunnels, buried tunnels, general tunnels, shield tunnels for cables, etc.
A plurality of curved plate-shaped or box-shaped segments made of concrete or the like are assembled by abutting respective end faces of each other.

In an underground pipe having such a segment-assembled structure, water leakage into the pipe through joints formed at abutting portions of the segments is prevented, and at the same time, wall portions are formed by spring water or permeation. It is necessary to quickly drain the water existing on the outer peripheral side downward.

Therefore, conventionally, for example, Japanese Unexamined Patent Publication No.
As disclosed in, for example, Japanese Patent No. 6399, a sealing structure in which a sealing material is filled between joint end surfaces of segments to seal joints, and an opening of a gap formed between joint end surfaces of segments. 2. Description of the Related Art There is known a headrace structure in which a sealing material is loaded and a joint is used as a headrace.

[0005] However, the former sealing structure requires complete sealing of joints, so that it is difficult to construct, and in addition, water easily stays on the outer peripheral side of the segment, and the ground supporting force due to the staying water is high. There is a problem that a problem such as a decrease may occur, and there is a problem that water leakage easily occurs from a portion where sealing of the joint is incomplete due to aging or the like.

On the other hand, in the latter water channel structure, it is necessary to insert a backup material into a gap between joints and then fill and seal a sealing material from the inner peripheral side of the pipeline.
There was a problem that construction was difficult. In addition, there is also a risk that the backup material may slide on the inner surface of the joint and fall into the pipeline due to the water pressure of the water channel and the like. Also, after all,
Since the joint opening needs to be sealed with a sealing material, there has been a problem that water leakage easily occurs due to imperfect sealing work or aging of the sealing material.

[0007]

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a method for quickly draining water on the outer peripheral side of a pipeline downward. A new joint water-stop structure and a joint water-stop method for underground pipes that can realize waterways with a simple structure and easy workability, and can exhibit excellent water-stop function over a long period of time Is to provide.

[0008]

An embodiment of the present invention which has been made to solve such a problem will be described below. The components employed in each of the embodiments described below can be employed in any combination as possible. In addition, aspects or technical features of the present invention are not limited to those described below, but are described in the entire specification and drawings, or based on the invention ideas that can be understood by those skilled in the art from the descriptions. It should be understood that it is recognized on the basis of.

That is, a feature of the first aspect of the present invention relating to an underground pipe is that the end faces of a plurality of segments are assembled with each other so that joints are formed at the joint portions of the segments. In the formed underground pipe, a concave locking groove that opens toward the joint side is formed at each end of the segment facing each other on both sides of the joint, and The plate-shaped cover plate, which is curved or bendable at a portion thereof, is bent or bent so that both edges in the width direction of the cover plate are opened at respective locking grooves formed on both sides of the joint. By locking the joint with the cover plate, the joint is formed so that a water passage is formed by the joint positioned on the outer peripheral side of the cover plate. Lies in the fact.

[0010] In the water stopping structure constructed in accordance with the present invention, locking grooves are formed on both sides of the joint.
Since the both side edges of the cover plate are inserted and locked therein, the joint gap at the abutting portion of the segments can be sealed with sufficient strength and durability. Moreover, on the outside of the lid plate,
Since the drainage channel can be formed by using the gap between the segments, stagnation of groundwater on the outer surface of the wall can be advantageously avoided.

According to a second aspect of the present invention relating to an underground pipeline, the sealing groove is filled with a sealing material in the underground pipeline having the structure according to the first aspect. Is the feature. In this embodiment, it is possible to easily and advantageously secure the sealing property at the locking portion between the cover plate and the locking grooves on both sides.

According to a third aspect of the present invention relating to an underground pipe, the underground pipe having a structure according to the first or second aspect is positioned opposite to the joint. It is characterized in that each locking groove is opened at the inner peripheral side corner of the opposing portion. In this aspect, it is possible to easily insert and lock both edge portions of the cover plate in the locking groove, and the workability can be improved.

According to a fourth aspect of the present invention relating to an underground pipeline, in the underground pipeline having a structure according to any of the first to third aspects, a widthwise intermediate portion of the cover plate is provided. In the portion, at least one notch is formed so as to extend in the circumferential direction on one side of the pipe inner surface side and the pipe outer surface side, and the cut is formed on the other side of the pipe inner surface side and the pipe outer surface side. At least one notch groove is formed at a corresponding position so as to extend in the circumferential direction. In this embodiment, the work of bending the cover plate is facilitated, and the workability can be improved.

In a fifth aspect of the present invention relating to an underground pipeline, the locking groove is formed in an underground pipeline having a structure according to any of the first to fourth aspects. The support frame member is formed separately from the segment, and is post-fixed to the segment. In such an embodiment, as compared with the case where the locking groove is formed integrally with the segment, the manufacture of the segment is facilitated, and the application of the present invention to an existing segment can be easily realized.

According to a sixth aspect of the present invention relating to an underground pipe, in the underground pipe having the structure according to any one of the first to fifth aspects, the formation section of the water blocking groove is provided. And a projecting ridge protruding from each opposing surface of the segment located on both sides sandwiching the joint, and from the side edges in the width direction of the cover plate to the pipe outer surface side with respect to the cover plate, respectively. An eaves-like portion that protrudes and covers the outer peripheral side of the ridge is integrally formed. In this aspect, the eaves-shaped portion integrally formed on the cover plate exerts an action of preventing the cover plate from coming off, and also exerts a retaining effect on the locking portion of the cover plate in the locking groove. .

According to a seventh aspect of the present invention relating to an underground pipeline, in the underground pipeline having a structure according to any one of the first to sixth aspects, the locking groove; A stopper mechanism is provided between both ends of the cover plate inserted in the locking groove in the width direction so as to exert a resistance against the cover plate coming out of the locking groove. . In this embodiment, since the cover plate is prevented from falling out of the locking groove, the cover plate is prevented from coming off due to the action of external force or the like, thereby being reduced or prevented, and the joint seal structure is further stabilized. Can be realized.

On the other hand, a feature of the present invention relating to a method of stopping water for joints of underground pipes is that the end faces of a plurality of segments are assembled with each other so that joints are formed at the joint portions of the segments. In the formed underground pipe, with respect to each edge of the segment facing each other on both sides of the joint,
A concave locking groove that opens toward the joint side is formed, and each locking groove is filled with a sealing material, and a plate-shaped cover plate that is bent or bendable at the center portion is bent or formed. By bending and inserting both edges of the cover plate in the width direction into the openings of the locking grooves formed on both sides of the joint, the joint is closed with the cover plate. And a joint stopping water method for an underground pipe buried in which a headrace channel is formed by the joint positioned on the outer peripheral side of the cover plate.

According to the method of the present invention, the joint gap at the abutting portion of the segments can be sealed with sufficient strength and durability. In particular, since the locking portion between the cover plate and the locking groove is filled with the sealing material, the waterproofness of the joint gap can also be highly achieved. Moreover,
Since the drainage channel can be formed using the gap between the segments outside the cover plate, stagnation of groundwater on the outer surface of the wall can be advantageously avoided.

In the method of the present invention, any of the structures according to the first to seventh aspects of the present invention relating to the joint waterproofing structure in the underground pipe can be appropriately adopted as necessary. That is, of course.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings.

First, FIG. 1 is a perspective explanatory view of a tunnel 10 as a specific example of an underground pipe provided with a joint water stopping structure according to the present invention. In addition, the tunnel 10
The cross-sectional view of the main part of the joint water stopping structure in
Is shown in

More specifically, the tunnel 10 of the present embodiment
Represents a plurality of segments 12a, 12b, 12c, 12d
Are provided so as to cover the inner peripheral surface 14 of the hole drilled in the soil,
2a, 12b, 12c, 12d,... Are attached to each other with their end faces facing each other.
As a whole, it has a hollow structure or a tubular structure. The plurality of segments 12a, 12b, 1
Are connected and fixed to each other by bolts or the like.

Each segment 12a, 12b, 12
In the butted surface portion 16 in c, 12d,.
As shown in FIG. 2, each segment 12a, 12a
There are gaps between the butting surfaces b, 12c, 12d,..., and joints 18 are formed by the gaps. In addition, each segment 12a, 12b, 12c, 12d,.
Has a notch 20 cut out in a rectangular shape at the inner peripheral edge, and the notch 20,
20 cooperate to form a sealing recess 22. That is, the sealing recess 22 is provided in the segment 1
2a, 12b, 12c, 12d,... Are continuously formed along the abutting surface portion 16.

A joint waterproof structure 24 is employed at the opening of the sealing recess 22 into the tunnel. This joint water stopping structure 24 is provided for each segment 1
A support frame 26 as a support frame member fixed by bolts, anchors, adhesives, or the like to the opening portions of the cutout portions 20 in 2, 2 is provided. The support frame 26 is
It has a substantially trapezoidal cross section, and is disposed continuously over the entire length of the cutout portion 20 of the segment 12. In addition, the support frame 26 has a portion where the segments 12 and 12 abut each other.
A pair of locking grooves 28 having a rectangular cross-section that opens toward the inside of the oblique tunnel in the facing direction are formed, each of which is opposed to each other at the opening of the sealing recess 22.

The joint water stopping structure 24 includes a cover plate 30. The cover plate 30 is used for the joints 18.
And has a strip shape extending continuously at a predetermined width along the width direction, and hook-shaped hooking projections 32 are integrally formed on both sides in the width direction. Further, in the center of the cover plate 30 in the width direction, a notch groove 36 that opens in a V-shape on one surface (the outer surface that is the upper side in FIG. 2) 34 is continuously formed over the entire length in the longitudinal direction of the strip. Is formed. On the other surface (the lower inner surface in FIG. 2) 38 of the cover plate 30, a slit-like cut 40 is formed continuously over the entire length of the strip in the longitudinal direction. The notch groove 36 and the notch 40 allow the cover plate 30 to be easily bent to one side (the direction in which the notch 40 becomes convex) at the center as shown in FIG. is there.

The joint water stopping structure 24 is provided with the segments 12, 1 disposed at the opening of the sealing recess 22.
After filling the locking grooves 28, 28 in the support frames 26, 26 with the sealing material, the cover plate 30 is bent at the center as shown in FIG. The edge portions 42, 42 are locked by fitting them into the locking grooves 28, 28, and restored to the open state as shown in FIG.

The cover plate 30 and the support frame 26,
26 can generally be formed of a suitable synthetic resin material. Particularly preferably, a thermoplastic elastomer (TPE,
It is preferable to use PP-based TPE) and PP and EPDM as its raw materials. Furthermore, urethane-based TPE, ethylene-α-olefin copolymer, and styrene-based TPE are advantageously used as TPE, and particularly PP-based% TPE.
Is preferred.

The segment 12 can be generally formed of a concrete material.

The joint water stopping structure 24 having such a structure.
In this case, the opening of the joint 18 into the tunnel is covered by the cover plate 30 in a fluid-tight manner.
Further, in such a state, a drainage channel is formed outside the cover plate 30 and is formed as a headrace channel by the sealing recess 22. Through this drainage channel, water is quickly drained downward. It will be.

Further, the joint water stopping structure 24 having the structure as described above is used.
In, by appropriately selecting the material,
Toughness, lightness, flexibility, cold resistance, weather resistance, heat resistance,
Aging resistance and the like can be easily obtained.

Moreover, the construction is easy, and the support frame
If the cover plates 6 and 26 are provided, the cover plate 30 can be quickly constructed by one-touch operation.

Although the embodiment of the present invention has been described above, this is a literal example, and the present invention is not limited to the embodiment.

For example, as shown in FIG. 4, the hooking projections 32 of the cover plate 30 are
It is also possible to adjust the width of the cover plate 30 so as to substantially engage with the opening portions of the 26 locking grooves 28, 28.

The notch 3 in the cover plate 30
The notch 6 and the cut 40 may be formed inside and outside to make it easy to bend outward. In this case, the locking grooves 28, 28
Is preferably opened at the outer corner. Further, by employing the cover plate 30 having such an externally bent structure, it is possible to improve the strength against external force from the outside.

Further, in the present invention, the cover plate 30 is bendable at one place. However, the cover plate 30 may be bendable as a whole, or may be bendable or bendable at a plurality of places.

The present invention is also applicable to repair work for cracks, cracks, cracks, and the like caused by construction causes, accidents, and the like due to temporal changes that occur in portions other than joints. And in this range,
The scope of the present invention can be easily inferred by those skilled in the art.

In addition, although not enumerated one by one, the present invention
Based on the knowledge of those skilled in the art, various changes, modifications, improvements, and the like can be made, and unless such embodiments depart from the spirit of the present invention.
Both are included in the scope of the present invention,
Needless to say.

[0038]

As is apparent from the above description, in the water stopping structure constructed in accordance with the present invention, locking grooves are formed on both sides of the joint, and both side edges of the cover plate are inserted into the locking grooves. The gap between the joints at the butted portion of the segments can be sealed with sufficient strength and durability. In addition, since the drainage channel can be formed using the gap between the segments outside the cover plate, stagnation of groundwater on the outer surface of the wall can be advantageously avoided.

[Brief description of the drawings]

FIG. 1 is an overall schematic view of a tunnel provided with a joint water stopping structure according to the present invention.

FIG. 2 is an enlarged sectional view showing a main part of a joint water stopping structure as one embodiment of the present invention employed in the tunnel shown in FIG. 1;

FIG. 3 is an explanatory diagram for explaining a construction method of the joint water stop structure shown in FIG. 2;

FIG. 4 is a sectional view corresponding to FIG. 2 and showing an enlarged main part of a joint water stopping structure as another embodiment of the present invention that can be employed in the tunnel shown in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Tunnel 12 Segment 16 Butted part 26 Support frame 28 Locking groove 30 Cover plate

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor: Shoichi Kodera 255 Kannonji-cho, Tsu-shi, Mie Pref.

Claims (8)

[Claims] 1. An underground pipe having joints formed at abutting portions of a plurality of segments by assembling the end surfaces of a plurality of segments with each other so as to be opposed to both sides of the joint. A concave locking groove that opens toward the joint side is formed at each end portion of the segment, and a plate-shaped cover plate that can be bent or bent at a center portion is bent or bent. Then, by inserting the both ends in the width direction of the cover plate into the openings of the locking grooves formed on both sides of the joint and locking the joint, the joint is closed with the cover plate, A joint water stopping structure in an underground buried conduit, wherein a water conduit is formed by the joint positioned on the outer peripheral side of the cover plate. 2. The joint stopping water structure in an underground pipe according to claim 1, wherein a sealing material is filled in the locking groove. 3. The joint stopping water in an underground pipe according to claim 1, wherein each of the locking grooves opposed to each other with the joint interposed therebetween is opened at an inner peripheral side corner of the opposed portion. Construction. 4. An intermediate portion of the cover plate in the width direction, at least one notch is formed on one of an inner surface side of the conduit and an outer surface side of the conduit so as to extend in a circumferential direction. The joint in a buried underground pipe according to any one of claims 1 to 3, wherein at least one notch groove is formed so as to extend in a circumferential direction at a position corresponding to the cut on the other side of the pipe outer surface side. Water structure. 5. The underground ground according to claim 1, wherein a support frame member forming the locking groove is formed separately from the segment, and is rear-fixed to the segment. Joint water stop structure in buried pipeline. 6. The formation portion of the locking groove is formed as a ridge projecting from each of the opposing surfaces of the segment facing each other on both sides of the joint. The joint stopping water in the underground conduit according to any one of claims 1 to 5, wherein eaves-like portions projecting from both side edges in the width direction to the outer surface of the conduit and covering the outer peripheral side of the ridge are integrally formed. Construction. 7. Between the locking groove and both ends in the width direction of the cover plate inserted into the locking groove, exerts resistance against the cover plate coming out of the locking groove. The joint stopping water structure in the underground pipe according to any one of claims 1 to 6, further comprising a stopper mechanism for obtaining the joint. 8. An underground conduit having joints formed at the butting portions of the plurality of segments by assembling the end surfaces of the plurality of segments with each other so as to oppose each other across the joint. A concave locking groove that opens toward the joint side is formed at each end of the segment, and each locking groove is filled with a sealing material, while being bent or bent at a central portion. Curved or bent, and inserts and locks the edge portions in the width direction of the cover plate into the openings of the respective locking grooves formed on both sides of the joint. Wherein the joint is closed by the cover plate, and a water conduit is formed by the joint positioned on the outer peripheral side of the cover plate. Construction method.