JP2003113699A - Flexible joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flexible joint requiring less width for the joint part thereof and not having such a possibility that a flexible water sealing member is swelled into a tunnel by an external hydraulic pressure. SOLUTION: This flexible joint comprises a flexible water sealing member 3 having one swelling part 3a formed of a short tubular flexible member and swelling to an outer peripheral side and the other swelling part 3b swelling to the inner peripheral side continuously formed in S-shape in cross section and having mounting end parts 3c and 3d continuously formed at the outer end parts of both swelling parts and a pair of ring-shaped frame bodies 4 and 5 fixed to a pair of culverts 2 and 2' and having a flexible water sealing member 3 installed thereon. A slanted surface part 4b slanting toward the inside of the joint is formed by bending the frame body 4 to an obtuse angle, and a slanted surface 5a slanting toward the inside of the joint is formed on the inner peripheral side of the slanted surface part 4b of the frame body 4 by bending the frame body 5 to an obtuse angle. A mounting end part 3c is installed on the slanted surface part 4b through a anchoring member, and the mounting end part 3d is installed on the slanted surface part 5a through the anchoring member.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a road tunnel, a water supply / sewerage system, an agricultural water supply system, an industrial water supply system, a water conduit tunnel, a shared trench, an underground conduit, etc. The present invention relates to a flexible joint suitable for being applied to a tunnel.

[0002]

2. Description of the Related Art As a flexible joint for an underdrain, a joint shown in the partial sectional view of FIG. 5 has been known. This joint a
Is a rubber that is housed between a pair of ring-shaped frame bodies f, which are attached to opposite step portions of the underdrain b, b, which is a connected body to be connected, and which has a bulging portion c in the central portion. Attaching both ends of a flexible water blocking member d in the form of a short tube made of synthetic resin or the like to anchor tube ends with anchor bolts e, e at the same distance in the radial direction as seen from the axis of the joint via frames f, f It is a thing.

[0003]

In such a conventional underdrain joint, one bulge portion c of the flexible water blocking member d is not sufficient to follow a large expansion and contraction displacement between the opposite underdrain. Therefore, normally two bulges c are provided, and therefore the width of the joint must be increased accordingly. Therefore, when this joint is used for a water tunnel, turbulence or the like is likely to occur in the water flow in the wide joint. Further, the bulging portion c of the flexible water blocking member d bulges toward the inner peripheral side of the joint due to external water pressure from outside the tunnel in a normal use state, but there are two bulging portions as shown in FIG. In this case, the bulging portion c may bulge to the position shown by the dotted line in FIG. 5 and project into the water channel, which may hinder the smooth flow of water.

Further, when this conventional joint is used for a road tunnel, a portion of the joint such as a middle vehicle is covered with an iron plate or the like and paved thereover, so that the flexible water blocking member d is used in the road. Although there is no danger of swelling in this case, even in this case, since the width of the joint is wide, a large amount of material for covering the joint such as an iron plate is required, and the thickness of the iron plate must be increased, which increases the construction cost. is there.

The present invention has been made in view of the above-mentioned problems of the conventional flexible joint, and does not increase the width of the joint portion of the flexible joint while having a sufficient amount of expansion / contraction displacement, and also depends on the external water pressure. An object of the present invention is to provide a flexible joint suitable for road tunnels and water tunnels, in which the flexible water blocking member does not swell into the tunnel.

[0006]

A flexible joint of the present invention which achieves the above object is a joint interposed between a pair of objects to be connected, which is a short tubular shape made of rubber, synthetic resin or the like. One bulging part that bulges toward the outer peripheral side and one bulge part that bulges toward the inner peripheral side are continuously formed in an S-shaped cross section, and the outer ends of both the bulging parts are formed. Includes a flexible water blocking member whose mounting end portions are continuously formed, and a pair of ring-shaped frame bodies fixed to the pair of connected bodies and to which the flexible water blocking member is attached.
A ring-shaped frame body fixed to one side of the pair of connected bodies is bent at an obtuse angle to form an inclined surface that is inclined toward the inside of the joint as viewed from the joint axis, in a part of the frame body,
The ring-shaped frame body fixed to the other side of the pair of connected bodies is bent at an obtuse angle to form a part of the other frame body on the inner peripheral side of the inclined surface of the one frame body from the joint axis line. When viewed, an inclined surface that inclines toward the inside of the joint is formed, and one of the mounting end portions of the flexible water blocking member is attached to the inclined surface of the one frame body by an anchoring member, and The other mounting end of the water member is attached to the inclined surface of the other frame by an anchoring member. The inclination angle of each of the inclined surfaces with respect to the joint axis is preferably 45 °.

[0007]

According to the present invention, each of the pair of ring-shaped frame bodies is formed with an inclined surface which inclines toward the inside of the joint as viewed from the joint axis line, and the other inclined surface is arranged on the inner peripheral side of one inclined surface. Since the surfaces are positioned and both mounting ends of the flexible waterproof member are attached to these inclined surfaces, the flexible waterproof member that receives external water pressure is not inclined in the radial direction of the joint but in the radial direction of the joint. Bulge in the direction. Therefore, in comparison with the conventional joint in which the flexible waterproof member bulges in the radial direction of the joint, when the amount of expansion and contraction displacement of the flexible waterproof member is the same, the bulge portion protrudes into the tunnel in the conventional joint. Even in such a case, in the joint of the present invention, it is possible to prevent the bulging portion from protruding into the tunnel, and it is possible to secure a smooth water flow in the water guiding tunnel.

Further, according to the above structure, since the mounting positions of both mounting ends of the flexible water blocking member are different from each other in the radial direction when viewed from the axis of the joint, the mounting positions of both mounting ends are at the same radial distance. The width of the joint can be reduced compared to some conventional joints. Therefore, the occurrence of turbulence or the like in the joint portion is reduced in the water tunnel, and the material covering the joint portion such as the iron plate can be saved in the road tunnel.

Further, since the inclined surface at which the flexible water blocking member is mounted is different in the radial direction and both inclined surfaces form an angle (90 ° in the illustrated embodiment), the direction of the mounting bolt also has an angle. Therefore, the construction space around the mounting bolts during construction is sufficiently secured, and as a result, the workability is improved.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 4 show an embodiment in which the present invention is applied to an underdrain such as a water guiding tunnel. FIG. 1 is a partial sectional view of a joint, FIG. 2 is a side view of a flexible water blocking member, and FIG. 3 is protection. 4A is a side view of the pressing plate, and FIG. 4B is a perspective view.

In FIG. 1, the upper part of the drawing shows the inner circumference side of the joint, and the lower part shows the outer circumference side. A flexible joint 1 interposed between a pair of cylindrical concrete underdrains 2 and 2'which are connected bodies to be connected is provided with a flexible water stop member 3 and the flexible water stop member 3 attached thereto. It is provided with a pair of ring-shaped frames 4 and 5.

The flexible water blocking member 3 is made of a short tubular flexible member made of rubber, synthetic resin or the like, and has one bulging portion 3a bulging to the outer peripheral side and one bulging portion 3a to the inner peripheral side. The bulging portion 3b is continuously formed in an S-shape in cross section, and mounting ends 3c and 3d are continuously formed at the outer end portions of both the bulging portions 3a and 3b. As shown in FIG. 2, watertight projections 6 are formed in the circumferential direction on the mounting sides of both the mounting end portions 3c and 3d to the frame body, and the flexible watertight member 3 is reinforced at the central portion thereof for reinforcement. The fiber sheet 7 is embedded. Further, bolt mounting holes 3e and 3f are formed in the mounting end portions 3c and 3d at predetermined intervals in the circumferential direction.

The frame body 4 fixed to the inner underdrain 2 side of the pair of ring-shaped frame bodies has a vertical surface portion 4a extending outward in the radial direction perpendicular to the axis of the joint, and a vertical surface portion 4a of this joint surface. It is provided with an inclined surface portion 4b that bends and extends inward at an angle of 135 °. Therefore, the inclined surface portion 4b is inclined at an inclination angle of 45 ° toward the inside of the joint as viewed from the joint axis. The frame body 4 is further bent at the outer peripheral end toward the outside of the joint by 135 ° to form a vertical surface portion 4c. A water expansion rubber 8 is arranged in a ring shape on the side of the underdrain 2 of the vertical surface portion 4c.

The frame 5 fixed to the underdrain 2'side has an inclined surface portion 5a which is inclined at an inclination angle of 45 ° toward the inside of the joint as viewed from the joint axis on the inner peripheral side, and the inclined surface portions 5a to 135. It is provided with a vertical surface portion 5b which is bent at an angle of ° and extends outward in the radial direction perpendicular to the axis of the joint. The inclined surface portion 5a is located closer to the inner peripheral side of the joint than the inclined surface portion 4b, and is arranged perpendicular to the inclined surface portion 4b. A water-expansion rubber 9 is arranged in a ring shape on the side of the underdrain 2'of the vertical surface portion 5b.

Anchor bolt insertion holes (not shown) are formed in the inclined surfaces 4b and 5a of the frames 4 and 5 at predetermined intervals in the circumferential direction. A joint material 10 made of foamed rubber or the like is interposed between the vertical surface portion 4c of the frame body 4 and the vertical surface portion 5b of the frame body 5.

The flexible water blocking member 3 is attached to the inclined surface portion 4b of the frame body 4 at the attachment end portion 3c and to the inclined surface portion 5a of the frame body 5 at the attachment end portion 3d by anchoring members.

The anchoring member on the frame 4 side is composed of a holding plate 12, anchor bolts 13 and nuts 14, and the anchoring member on the frame 5 side is composed of a holding plate 12 ', anchor bolts 13 and nuts 14.

The holding plate 12 is made of steel and is shown in FIG.
As shown in an enlarged side view and a perspective view in FIG. 4 (b), a head 12a having a top surface formed in an arc shape, and a plate-shaped vertical portion extending vertically from one end surface of the head 12a 12b and a ring-shaped horizontal portion 12c extending horizontally from both ends of the vertical portion 12b opposite to the head portion 12a to form a T shape with the vertical portion 12b. The member is divided into a plurality of pieces in the circumferential direction, and a plurality of bolt holes 12d for inserting anchor bolts are formed at positions corresponding to the anchor bolt inserting holes of the frame body 4 by penetrating the vertical portion 12b. . A recess 11 is formed between a portion of the head 12a that does not contact the vertical portion 12b and a corresponding end of the horizontal portion 12c.

The holding plate 12 'is the same as the holding plate 12 except that one end of the horizontal portion 12c corresponding to the portion of the holding plate 12 which does not contact the vertical portion 12b of the head 12a does not exist, and therefore the recess 11 does not exist. It has the same shape.

In order to attach the flexible water blocking member 3 to the frames 4 and 5, the anchor bolt insertion holes of the inclined surface portions 4b and 5a of the frames 4 and 5 are placed before the concrete of the underdrain 2, 2'is placed. Anchor bolt 13 is inserted through and the bolt portion 13a is welded to the surface of the inclined surface portions 4b and 5a on the side of the underdrain to stop water.

Next, the mounting ends 3c and 3d of the flexible water blocking member 3 are attached.
Anchor bolt 1 in the anchor bolt insertion holes 3e, 3f of
The flexible water blocking member 3 is arranged such that the flexible water blocking member 3 is inserted therethrough. Next, on the frame body 4 side, the pressing plate 12 is arranged on the flexible water blocking member 3 such that the recess 11 faces the inner peripheral side of the joint, and the anchor bolt is inserted into the bolt hole 12d.

The flexible water blocking member protection member 15 is made of an elastic material such as foamed rubber, and as shown in the perspective view of FIG.
The holding plate 12 is a plate-shaped member having a size and shape that can be fitted into the recess 11 of the holding plate 12, and bolt holes 15a for inserting anchor bolts are formed at positions corresponding to the bolt holes 12d of the holding plate 12. After inserting the bolt mounting hole of the flexible water blocking member 3 into the anchor bolt 13 and then inserting the pressing plate 12,
The mounting end 3c of the flexible water blocking member 3 is fixed to the inclined surface portion 4b of the frame body 4 by tightening the nut 14 on the anchor bolt 13. Next, the bolt hole 15a of the flexible water blocking member protection member 15 is inserted into the nut 14 to which the pressing plate 12 is tightened, and the flexible water blocking member protection member 1 is inserted into the recess 11 of the pressing plate 12.
Install 5. The flexible water blocking member protection member 15 prevents the flexible water blocking member 3 from coming into contact with the bolt head and being damaged when the flexible water blocking member 3 is compressed and displaced.

Also on the frame body 5 side, the mounting end 3d of the flexible water blocking member 3 is formed by the same construction method as that on the frame body 4 side except that the mounting of the flexible water blocking member protection member 15 is omitted. Attach to 5a.

Since the flexible water blocking member 3 is attached to the inclined surface portions 4b and 5a which are installed at an angle to each other, the work of tightening the nut 14 into the anchor bolt 13 is performed by the inner peripheral surface of the flexible water blocking member 3. It can be performed only on the side and the workability is good.

Next, the frames 4 and 5 are fixed to the underdrain 2, 2'by placing concrete in the underdrain 2, 2'and the joint 1
Complete the construction. Since the bent portions of the frames 4 and 5 are bent at obtuse angles, the flow of concrete is good at the time of placing concrete, and the bent portions are bent at right angles as in the conventional joint shown in FIG. Generation of air pockets can be prevented, and water blocking performance can be improved. The water-expansion rubbers 8 and 9 serve to make the water stop at the bent portion more complete.

Next, the operation of the joint 1 will be described.
When external water pressure is applied in a normal use state after construction, the flexible water blocking member 3 bulges in a semicircular shape toward the inner peripheral side as shown by the broken line in FIG. 1, but the mounting end portion 3d of the inclined surface portion 5a is mounted. Since the position is located on the inner circumferential side of the mounting position of the mounting end portion 3c on the inclined surface portion 4b, the flexible water blocking member 3 that receives external water pressure is 45 ° with respect to the radial direction of the joint, not the radial direction of the joint. Bulges diagonally. Further, by adjusting the mounting position of the flexible water blocking member 3, the flexible water blocking member 3 does not project to the inner circumference side of the inner circumferential surfaces 2a, 2'a of the underdrain 2, 2 '.

When the underdrain 2 or 2'displaces in a direction toward or away from each other or in a shearing direction due to a change in the ground due to an earthquake or the like, the flexible water blocking member 3 follows the displacement and expands or contracts. By doing so, it is possible to cope with such relative displacement between the underdrain.

Although the above description has been made for the case where the cross-sectional shape of the underdrain is circular, the shape of the underdrain is not limited to the circular shape, and other shapes such as a square, a rectangle, a polygon, a horseshoe and an ellipse may be used. Good.

Further, the present invention can be applied not only to the underdrain but also to the open underdrain.

[0030]

As described above, according to the present invention, 1
An inclined surface that inclines toward the inside of the joint when viewed from the joint axis is formed on each of the pair of ring-shaped frame bodies, and the other inclined surface is located on the inner peripheral side of one of the inclined surfaces. Since both mounting ends of the flexible water blocking member are attached, the flexible water blocking member that receives external water pressure swells not in the radial direction of the joint but in an oblique direction with respect to the radial direction of the joint. Therefore, in comparison with the conventional joint in which the flexible waterproof member bulges in the radial direction of the joint, when the amount of expansion and contraction displacement of the flexible waterproof member is the same, the bulge portion protrudes into the tunnel in the conventional joint. Even in such a case, in the joint of the present invention, it is possible to prevent the bulging portion from protruding into the tunnel, and it is possible to secure a smooth water flow in the water guiding tunnel.

Further, since the mounting positions of both mounting ends of the flexible waterproof member are different from each other in the radial direction when viewed from the axis of the joint, the mounting positions of both mounting ends are the same in the radial direction. The width of the joint can be reduced compared to some conventional joints. Therefore, the occurrence of turbulence or the like in the joint portion is reduced in the water tunnel, and the material covering the joint portion such as the iron plate can be saved in the road tunnel.

Further, since both inclined surfaces which are the mounting positions of the flexible water blocking members are different in the radial direction and both inclined surfaces form an angle (90 ° in the illustrated embodiment), the direction of the mounting bolt is also angled. The construction space around the mounting bolts during construction is sufficiently secured, and as a result, construction efficiency is improved.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a joint according to one embodiment of the present invention.

FIG. 2 is a side view of a flexible water blocking member.

FIG. 3 is a perspective view of a flexible water blocking member protection member.

FIG. 4A is a side view of a pressing plate, and FIG. 4B is a perspective view.

FIG. 5 is a partial cross-sectional view of a conventional flexible joint.

[Explanation of symbols]

1 Flexible joint 2,2 'Underdrain 3 Flexible water blocking member 4, 5 frame 12 Presser plate 13 Anchor bolt 14 nuts 15 Flexible water blocking member protection member

Claims (2)

[Claims] 1. A joint interposed between a pair of objects to be connected, comprising a flexible member in the form of a short cylinder made of rubber, synthetic resin or the like, and a bulge bulging toward the outer peripheral side. A swelling portion and one bulging portion that bulges toward the inner peripheral side are continuously formed in an S-shaped cross section, and mounting ends are continuously formed at the outer ends of both bulging portions. A water member, and a pair of ring-shaped frame members fixed to the pair of connected members and to which the flexible water blocking member is attached,
An inclined surface that is inclined toward the inside of the joint when viewed from the joint axis is formed in a part of the frame body by bending the ring-shaped frame body fixed to one side of the pair of connected bodies at an obtuse angle,
The ring-shaped frame body fixed to the other side of the pair of connected bodies is bent at an obtuse angle to form a part of the other frame body on the inner peripheral side of the inclined surface of the one frame body from the joint axis line. When viewed, an inclined surface that inclines toward the inside of the joint is formed, and one of the mounting end portions of the flexible water blocking member is attached to the inclined surface of the one frame body by an anchoring member, and A flexible joint characterized in that the other mounting end of the water member is mounted on the inclined surface of the other frame by an anchoring member. 2. The flexible joint according to claim 1, wherein an inclination angle of each inclined surface with respect to the joint axis is 45 °.