JP3708859B2 - Flexible joint - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to water tunnels for road tunnels, water and sewage systems, agricultural water systems, industrial water systems, etc., flexible joints for underdrains and open channels such as joint grooves, underground passages, etc., and particularly suitable for application to road tunnels and water transmission tunnels. The present invention relates to a flexible joint.
[0002]
[Prior art]
Conventionally, a joint as shown in the partial cross-sectional view of FIG. 5 is known as a flexible joint such as a culvert. The joint a is accommodated between a pair of ring-shaped frames f and f attached to the opposing stepped portions of the underdrains b and b, which are connected bodies to be connected, and a bulging portion c at the center. Both ends of a short cylindrical flexible water-stopping member d made of rubber, synthetic resin or the like provided with an anchor bolt e, e through frame frames f, f at the same distance in the radial direction as viewed from the joint axis It is attached to the part.
[0003]
[Problems to be solved by the invention]
In such a conventional culvert joint, one bulge portion c of the flexible water-stopping member d is not sufficient to follow a large expansion / contraction displacement between opposing culverts. The part c is provided, and therefore the width of the joint must be increased accordingly. For this reason, when this joint is used in a water guide tunnel, there is a high possibility that turbulent flow or the like is generated in the water flow at a wide joint part. Further, the bulging portion c of the flexible water blocking member d bulges to the inner peripheral side of the joint by an external water pressure from outside the tunnel in a normal use state, but there are two bulging portions as shown in FIG. In such a case, the bulging portion c may bulge to the position indicated by the dotted line in FIG. 5 and protrude into the water channel, with the result that smooth water flow may be hindered.
[0004]
Further, when this conventional joint is used for a road tunnel, a portion that becomes a passage such as a middle rail of the joint portion is covered with an iron plate or the like and paved thereon, so that the flexible water-stop member d bulges into the road. However, even in this case, since the width of the joint portion is wide, a large amount of material for covering the joint portion such as an iron plate is required, and the thickness of the iron plate must be increased, resulting in an increase in construction cost.
[0005]
The present invention is considered in view of the problems of the above-mentioned 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 is not flexible due to external water pressure. An object of the present invention is to provide a flexible joint suitable for a road tunnel or a water guide tunnel, in which there is no possibility that the water member swells into the tunnel.
[0006]
[Means for solving the problems]
The flexible joint of the present invention that achieves the above object is a joint interposed between a pair of connected bodies to be connected, and is composed of a short cylindrical flexible member made of rubber, synthetic resin, or the like. One bulging portion that bulges to the side and one bulging portion that bulges to the inner peripheral side are formed continuously in an S-shaped cross section, and the mounting end portion is continuous to the outer end portions of both bulging portions. And a pair of ring-shaped frames that are fixed to the pair of connected bodies and to which the flexible water-stopping member is attached. A ring-shaped frame fixed to one side 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. By bending a ring-shaped frame fixed to the other side at an obtuse angle, a joint axis is formed on a part of the other frame on the inner peripheral side of the inclined surface of the one frame. An inclined surface that is inclined toward the inside of the joint as viewed from above is formed, and either one of the attachment ends of the flexible water-stopping member is attached to the inclined surface of the one frame body by a fastening member. The other attachment end portion of the water stop member is attached to the inclined surface of the other frame body by a fastening member.
The inclination angle of each inclined surface with respect to the joint axis is preferably 45 °.
[0007]
[Action]
According to the present invention, each of the pair of ring-shaped frames is formed with an inclined surface that is inclined inward of the joint as viewed from the joint axis, and the other inclined surface is positioned on the inner peripheral side of the one inclined surface. Since both the mounting end portions of the flexible water-stopping member are attached to these inclined surfaces, the flexible water-stopping member subjected to external water pressure swells obliquely with respect to the joint radial direction, not to the joint radial direction. Put out. Therefore, when compared with the conventional joint in which the flexible water-stopping member bulges in the radial direction of the joint, the bulging portion of the conventional joint protrudes into the tunnel when the expansion / contraction displacement amount of the flexible water-stopping member is the same. Even in this case, in the joint of the present invention, it is possible to suppress the bulging portion from protruding into the tunnel, and a smooth water flow can be ensured in the water guide tunnel.
[0008]
Moreover, since the mounting positions of the both mounting end portions of the flexible water-stopping member are at different positions in the radial direction when viewed from the joint axis, the mounting positions of both mounting end portions are the same distance in the radial direction. The width of the joint can be reduced compared to the joint. Therefore, the occurrence of turbulent flow or the like in the joint portion is reduced in the water guide tunnel, and the material for covering the joint portion such as an iron plate can be saved in the road tunnel.
[0009]
In addition, since the inclined surfaces which are the mounting positions of the flexible water blocking members are different in the radial direction and both inclined surfaces are angled (90 ° in the illustrated embodiment), the direction of the mounting bolt is also angled. The construction space around the mounting bolt at the time of construction is sufficiently secured, and as a result, the workability is improved.
[0010]
DETAILED DESCRIPTION OF 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 a conduit such as a water-conducting tunnel. FIG. 1 is a partial sectional view of a joint, FIG. 2 is a side view of a flexible water-stopping member, and FIG. FIG. 4A is a side view of the pressing plate, and FIG. 4B is a perspective view of the member.
[0011]
In FIG. 1, the upper side of the figure shows the inner peripheral side of the joint, and the lower side shows the outer peripheral side. A flexible joint 1 interposed between a pair of cylindrical concrete culverts 2, 2 ′ which are connected bodies to be connected is a flexible water-stopping member 3 and a flexible water-stopping member 3 attached to the flexible joint 1. A pair of ring-shaped frame bodies 4 and 5 are provided.
[0012]
The flexible water stop member 3 is made of a short cylindrical flexible member made of rubber, synthetic resin, etc., and has one bulging portion 3a bulging on the outer peripheral side and one bulging portion bulging on the inner peripheral side. 3b is formed continuously in an S-shaped cross section, and attachment end portions 3c, 3d are formed continuously at the outer ends of the bulging portions 3a, 3b. As shown in FIG. 2, a water stop protrusion 6 is formed in the circumferential direction on the attachment side of both the attachment end portions 3 c and 3 d to the frame body, and a reinforcing water stop member 3 is provided at the central portion for reinforcement. The fiber sheet 7 is embedded. Further, bolt insertion holes 3e and 3f are formed in the mounting end portions 3c and 3d at predetermined intervals in the circumferential direction.
[0013]
The frame body 4 fixed to the pair of ring-shaped frame bodies 2 on the side of the inner casing 2 has a vertical surface portion 4a extending perpendicularly to the outer side in the radial direction perpendicular to the joint axis, and directed from the vertical surface portion 4a toward the inside of the joint. And an inclined surface portion 4b that is bent and extended at an angle of 135 °. Accordingly, 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 135 ° toward the outside of the joint at the outer peripheral end portion to form a vertical surface portion 4c. A water expansion rubber 8 is disposed in a ring shape on the side of the underside of the vertical surface portion 4c.
[0014]
The frame body 5 fixed to the underside 2 ′ has an inclined surface portion 5a inclined at an inclination angle of 45 ° toward the inner side of the joint as viewed from the joint axis on the inner peripheral side, and an angle of 135 ° from the inclined surface portion 5a. Is provided with a vertical surface portion 5b that is bent in the direction perpendicular to the axis of the joint and extends radially outward. The inclined surface portion 5a is located on the inner peripheral side of the joint with respect to the inclined surface portion 4b, and is disposed perpendicular to the inclined surface portion 4b. A water expansion rubber 9 is disposed in a ring shape on the underside 2 ′ side of the vertical surface portion 5b.
[0015]
Anchor bolt insertion holes (not shown) are formed in the inclined surfaces 4b and 5a of the frames 4 and 5 in the circumferential direction at predetermined intervals. A joint material 10 made of foamed rubber or the like is interposed between the vertical surface portion 4 c of the frame body 4 and the vertical surface portion 5 b of the frame body 5.
[0016]
The flexible waterproofing member 3 is attached to the inclined surface portion 4b of the frame body 4 at the attachment end portion 3c, and attached to the inclined surface portion 5a of the frame body 5 at the attachment end portion 3d.
[0017]
The fastening member on the frame body 4 side is composed of a pressing plate 12, anchor bolts 13 and nuts 14, and the fastening member on the frame body 5 side is composed of a pressing plate 12 ′, anchor bolts 13 and nuts 14.
[0018]
The holding plate 12 is made of steel, and as shown in an enlarged side view in FIG. 4 (a) and a perspective view in FIG. 4 (b), a head 12a having a top surface formed in an arc shape, A plate-like vertical portion 12b extending in the vertical direction from one end face, and a horizontal portion on both sides of the vertical portion 12b so as to form a T-shape with the vertical portion 12b from the opposite end to the head portion 12a of the vertical portion 12b A ring-shaped member having a plate-like horizontal portion 12c extending in the circumferential direction is divided into a plurality of portions in the circumferential direction, and a plurality of bolt holes 12d for inserting anchor bolts penetrate the vertical portion 12b. It is formed at a position corresponding to the anchor bolt insertion hole. A concave portion 11 is formed between a portion of the head portion 12a that does not contact the vertical portion 12b and a corresponding end portion of the horizontal portion 12c.
[0019]
The holding plate 12 ′ has the same shape as the holding plate 12 except that one end portion of the horizontal portion 12 c corresponding to the portion of the holding plate 12 that does not contact the vertical portion 12 b of the head portion 12 a does not exist, and therefore the recessed portion 11 does not exist. is there.
[0020]
In order to attach the flexible waterproofing member 3 to the frames 4 and 5, before placing the concrete of the undercarriage 2 and 2 ', anchor bolts are inserted into the anchor bolt insertion holes of the inclined surface portions 4b and 5a of the frames 4 and 5, respectively. 13 is inserted and the bolt part 13a is welded to the underside surface of the inclined surface parts 4b and 5a for water stop.
[0021]
Next, the flexible water blocking member 3 is arranged so that the anchor bolt 13 is inserted into the anchor bolt insertion holes 3e and 3f of the attachment end portions 3c and 3d of the flexible water blocking member 3. Next, on the frame body 4 side, the presser plate 12 is arranged on the flexible water-stopping member 3 so that the concave portion 11 faces the inner peripheral side of the joint, and an anchor bolt is inserted into the bolt hole 12d.
[0022]
The flexible water blocking member protection member 15 is made of a material having elasticity, such as foam rubber, and is a plate having a size and shape that can be fitted into the recess 11 of the presser plate 12 as shown in the perspective view of FIG. A bolt hole 15 a for inserting an anchor bolt is formed at a position corresponding to the bolt hole 12 d of the presser plate 12. The bolt mounting hole of the flexible water-stopping member 3 is inserted into the anchor bolt 13, and then the presser plate 12 is fitted. Then, the nut 14 is tightened on the anchor bolt 13 to fix the mounting end 3 c of the flexible water-stopping member 3 to the frame. It fixes to the inclined surface part 4b of the body 4. FIG. Next, the bolt hole 15 a of the flexible water-stopping member protection member 15 is inserted into the nut 14 that tightens the presser plate 12, and the flexible water-stopping member protection member 15 is attached to the recess 11 of the presser plate 12. The flexible water blocking member protection member 15 prevents the flexible water blocking member 3 from being damaged by coming into contact with the bolt head when the flexible water blocking member 3 is compressed and displaced.
[0023]
On the frame body 5 side, the mounting end 3d of the flexible water blocking member 3 is attached to the inclined surface portion 5a by the same construction method as that for the frame body 4 except that the mounting of the flexible water blocking member protection member 15 is omitted. .
[0024]
Since the flexible waterproofing member 3 is attached to the inclined surface portions 4b and 5a installed at an angle to each other, the operation of tightening the nut 14 on the anchor bolt 13 is performed only on the inner peripheral surface side of the flexible waterproofing member 3. It can be performed and the workability is good.
[0025]
Next, the frames 4 and 5 are fixed to the culverts 2 and 2 ′ by placing concrete of the culverts 2 and 2 ′, and the construction of the joint 1 is completed. Since the bent portions of the frames 4 and 5 are bent at an obtuse angle, the flow of the concrete is good when pouring the concrete, and the bent portion is bent at a right angle as in the conventional joint shown in FIG. Generation of air pockets can be prevented, and water stoppage can be improved. The water expansion rubbers 8 and 9 make the water stop at the bent portion even more complete.
[0026]
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 swells in a semicircular shape toward the inner peripheral side as shown by the broken line in FIG. 1, but the attachment end 3d is attached to the inclined surface portion 5a. Since the position is located on the inner peripheral side with respect to the mounting position of the mounting end 3c in the inclined surface portion 4b, the flexible water blocking member 3 that has been subjected to external water pressure is 45 ° with respect to the radial direction of the joint instead of the radial direction of the joint. Bulge in the diagonal direction. Further, by adjusting the mounting position of the flexible water blocking member 3, the flexible water blocking member 3 does not protrude to the inner peripheral side from the inner peripheral surfaces 2a, 2'a of the underdrains 2, 2 '.
[0027]
In addition, when the underdrains 2, 2 ′ are moved toward or away from each other or in the shearing direction due to changes in the ground due to an earthquake or the like, the flexible waterproofing member 3 is expanded and contracted following the displacement. Such relative displacement between underdrains can be dealt with.
[0028]
Although the above description has been made for a culvert with a circular cross-sectional shape, the shape of the culvert is not limited to a circle, and may be other shapes such as a square, a rectangle, a polygon, a horseshoe, an ellipse.
[0029]
In addition, the present invention is not limited to underdrains but can be applied to unfolding.
[0030]
【The invention's effect】
As described above, according to the present invention, each of the pair of ring-shaped frame bodies is formed with an inclined surface that is inclined toward the inner side of the joint as viewed from the joint axis, and on the inner peripheral side of one inclined surface. Since the other inclined surfaces are positioned and both mounting ends of the flexible water-stopping member are attached to these inclined surfaces, the flexible water-stopping member subjected to external water pressure is not in the radial direction of the joint but in the radial direction of the joint. On the other hand, it swells in an oblique direction. Therefore, when compared with the conventional joint in which the flexible water-stopping member bulges in the radial direction of the joint, the bulging portion of the conventional joint protrudes into the tunnel when the expansion / contraction displacement amount of the flexible water-stopping member is the same. Even in this case, in the joint of the present invention, it is possible to suppress the bulging portion from protruding into the tunnel, and a smooth water flow can be ensured in the water guide tunnel.
[0031]
Moreover, since the mounting positions of the both mounting end portions of the flexible water-stopping member are at different positions in the radial direction when viewed from the joint axis, the mounting positions of both mounting end portions are the same distance in the radial direction. The width of the joint can be reduced compared to the joint. Therefore, the occurrence of turbulent flow or the like in the joint portion is reduced in the water guide tunnel, and the material for covering the joint portion such as an iron plate can be saved in the road tunnel.
[0032]
In addition, 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 also forms an angle. The construction space around the mounting bolt at the time of construction is sufficiently secured, and as a result, the workability is improved.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional view of a joint according to an 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.
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]
DESCRIPTION OF SYMBOLS 1 Flexible joint 2, 2 'Underdrain 3 Flexible water stop member 4, 5 Frame body 12 Presser plate 13 Anchor bolt 14 Nut 15 Flexible water stop member protection member

Claims (2)

A joint interposed between a pair of connected bodies to be connected, which is composed of a short cylindrical flexible member made of rubber, synthetic resin, etc. One bulging portion that bulges to the side and is formed continuously in an S-shaped cross section, and a flexible water-stopping member in which mounting end portions are continuously formed on the outer ends of both bulging portions; A pair of ring-shaped frame bodies fixed to a pair of connected bodies and to which the flexible water-stopping member is attached, and the ring-shaped frame bodies fixed to one side of the pair of connected bodies at an obtuse angle By bending, an inclined surface inclined toward the inside of the joint as viewed from the joint axis is formed on a part of the frame, and the ring-shaped frame fixed to the other side of the pair of connected bodies is obtuse. Inclination that inclines toward the inside of the joint as viewed from the joint axis on a part of the other frame on the inner peripheral side of the inclined surface of the one frame by bending The mounting end of one of the flexible water-stopping members is attached to the inclined surface of the one frame body by a fastening member, and the other mounting end of the flexible water-stopping member is attached to the other A flexible joint, wherein the flexible joint is attached to an inclined surface of a frame by a fastening member. The flexible joint according to claim 1, wherein an inclination angle of each inclined surface with respect to a joint axis is 45 °.

Images