JPS6154895B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an open channel joint used for connecting open channels such as agricultural waterways, drainage channels, and general waterways.

In conventional open channel joints, both ends of a flexible water stop member made of an elastic material such as rubber or synthetic resin and having a hollow part for expansion and contraction in the middle are attached between the inner surfaces of the opposing ends of the open channel. Some systems are designed to cut off water to the outside of the open channel. When such an open channel joint is used to connect two open channels that are buried in a place where external water pressure such as groundwater is applied, the flexible water stop member bulges inward and deforms, causing this flexible stop. There is a risk that the durability of the water member may decrease or the flexible water stop member may be damaged.
In addition, such bulging deformation of the flexible water-stopping member causes internal water flow resistance, which poses a problem of greatly impeding hydraulic conditions.

It is an object of the present invention to provide an open channel joint that eliminates these problems.

The present invention provides a frame body having a substantially square cross section consisting of a large step part and a small step part on each of the inner surfaces of the end portions of a pair of open channels to be connected, and straddles between the pair of open channels and the frame body. An external flexible water-stopping member and an internal flexible water-stopping member made of an elastic material such as rubber or synthetic resin are provided at the inner position of the
Between the external flexible water-stopping member and the internal flexible water-stopping member, there is a cross section corresponding to the large step portion and the small step portion of the frame body.
A push plate is placed on the inner surface of the internal flexible water-stopping member at the small step at the inner end of the frame body, and the frame body and the external flexible plate are connected with a fastener such as a bolt. By fastening the flexible water stop member, the intermediate load-bearing plate, and the internal flexible water stop member, the flexible water stop member can be easily replaced in the event of water leakage, and even if large external water pressure is applied, the flexible water stop member can be easily replaced. The inward bulge of the member can be prevented, and the extension force acting on the external flexible water-stopping member can be prevented from directly acting on the fastening bolt penetration part of the external flexible water-stopping member, thereby improving waterstopping properties. It is possible to provide an open channel joint that can be greatly improved.

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numerals 1 and 1' denote a pair of concrete open conduits having a U-shaped cross section facing each other, and 2 a joint material interposed between the open conduits 1 and 1'. In FIG. 2, the open channel joint 3 has frames 4, 4' fixed to the inner surfaces of opposite ends of the open channels 1, 1'. The frames 4, 4' have large step parts 4a, 4'a and a small step part 4.
b, 4'b, and the connecting part 4 that connects them
c, 4'c, and flange portions 4d, 4'd protruding inward from the open channel at the ends of the small step portions 4b, 4'b, and have a cross-sectional shape. The inner end surfaces of these flange portions 4d, 4'd are the inner surfaces 1 of the open channels 1, 1'.
It is formed flush with a and 1'a.

Further, the open channel joint 3 has an external flexible water-stopping member 5 and an internal flexible water-stopping member 6 made of an elastic material such as rubber or synthetic resin. These flexible water stop members 5, 6
are fitted together. Both ends of this external flexible water-stopping member 5 are made up of a small step part A, a connecting part B, and a large step part C, which are shaped along the inner surfaces of the frames 4, 4'. is mated to. Moreover,
A constricted portion 5a having a rounded cross-section facing inward is formed in the center of the flexible water stop member 5, and a generally round-shaped concave portion 5b facing inward is formed on the outer surface of the constricted part 5a. Furthermore, if the open channels 1 and 1' are displaced in the direction in which the joints open in the axial direction of the open channels 1 and 1' due to an earthquake, etc., the external earth and sand of the open channels 1 and 1' will enter the recess 5b through the gap between the joints. However, a foamed elastic body such as a sponge may be placed in the concave portion 5b so that the constricted portion 5a of the external flexible water-stopping member 5 is not inhibited from following displacement due to uneven subsidence or the like. Also,
The internal flexible water stop member 6 has an inner surface 6a formed to be substantially smooth. Moreover, on the outside of the internal flexible water stop member 6, there are approximately U-shaped protrusions 6b, 6' extending outward.
b is formed, and cavities 6c, 6'c extending along the protrusions 6b, 6'b are formed inside the protrusions 6b, 6'b. The constricted portion 5a is closely fitted between the protrusions 6b and 6'b. At both ends of the internal flexible water stop member 6, there are push plate fitting holes 6 which open toward the inner side of the inner surface 6a and have a substantially square cross section.
d, 6'd are formed.

Intermediate load-bearing plates 7 and 7' are interposed between both ends of the flexible water stop members 5 and 6. These intermediate load-bearing plates 7, 7' are large step parts 7c, 7'c along the large step parts 4a, 4'a of the frames 4, 4', and connecting parts 7b, 7' along the connecting parts 4c, 4'c. b, and small step portions 7a, 7'a. A push plate D is fitted into the push plate grooves 6d and 6'd.

Reference numerals 8 and 8' indicate anchor bolts, one end of which is buried in the open conduits 1 and 1'. The threaded portions of these anchor bolts 8, 8' are connected to the small stepped portions 4 of the frames 4, 4'.
b, 4'b, a small stepped portion A of the external flexible water stop member 5;
It passes through the small steps 7a, 7'a of the intermediate load-bearing plate 7, the end of the internal flexible water stop member 6, and the pusher plate D, and nuts 9, 9' are fastened to the tips thereof. .

In such a structure, the interval t ₁ between the connecting parts 4c and 7b is formed to be slightly larger than the interval t ₂ between the large step parts 4a and 7c, and the interval t ₁ is determined by the tightening of the external flexible water stop member 5. It is formed slightly smaller than the previous thickness.

Next, the usage conditions and advantages of the open-drain joint with this configuration will be described.

When the open conduits 1 and 1' connected using the open conduit joint 3 are buried in the ground with a lot of groundwater, etc., the constriction 5a of the external flexible water stop member 5 is inflated inwardly. External water pressure is applied to deform the external flexible water stop member 5, but the large stepped portion C of the external flexible water stop member 5 that is about to deform is held between the large stepped portions between the frames 4, 4' and the intermediate load-bearing plates 7, 7'. Further, the connecting portions 4c, 4'c and 7b, 7'b prevent extension toward the constricted portion 5a. Therefore, the end portion of the external flexible water stop member 5 does not extend in the longitudinal direction of the open channels 1, 1' due to the external water pressure acting as the bulging deformation force in this case. Moreover, the bulging force is caused by the bolt 8 of the external flexible water stop member 5,
Since it does not act on the circumferential surface of 8', the watertightness of this part is maintained.

When a large uneven settlement occurs in the ground and the open channels 1 and 1' undergo a large relative displacement as shown in FIG. 3, the constriction of the flexible water stop member 5 and the flexible water stop member 6
The middle part of the area expands to absorb the large unequal settlement. Moreover, the external flexible water stop member 5 can support large external water pressure because both ends of the constricted portion 5a having a rounded cross section are supported by the large stepped portion of the intermediate load-bearing plate 7.

Although the embodiments have been described above, the present invention is not limited thereto and includes the following.

(1) In the above embodiment, a case has been described in which the open ditch joint 3 is applied to an open ditch made of concrete, but the present invention is not limited to this and can be applied to open ditches made of other materials. For example, it can be applied to a material made of only steel or a combination of steel and concrete.

(2) In the above embodiment, the shape of the open channel is U-shaped in cross section, but this is not limited to this, and for example, the shape is semicircular in cross section, semielliptical in cross section, polygonal in cross section with a partially open area. It can also be applied to

(3) In the above embodiment, the shape of the protrusion of the internal flexible water stop member is U-shaped in cross section, but it is not limited to this.
Alternatively, it may have a trapezoidal cross section.

[Brief explanation of the drawing]

Figure 1 is a perspective view of the open channel. FIG. 2 is a partially enlarged sectional view of FIG. 1. FIG. 3 is a partially enlarged sectional view for explaining the function of the open channel joint according to the present invention. 1, 1'...Open channel, 3...Open channel joint, 4,
4'... Frame body, 5... External flexible water stop member, 6...
Internal flexible water stop member, 7, 7'... intermediate load-bearing plate,
8, 8'...Anchor bolt.

Claims (1)

[Claims] 1. On each of the inner surfaces of the ends of the pair of open channels to be connected,
A frame body with a cross-section of approximately the same shape as a large step part and a small step part is provided, and an external flexible water stopper made of an elastic material such as rubber or synthetic resin is provided at an inner position of the frame body, spanning between the pair of open channels. and an internal flexible water-stopping member, and between the external flexible water-stopping member and the internal flexible water-stopping member, there is provided an intermediate load-bearing plate having a substantially square cross-sectional shape corresponding to the large step portion and the small step portion of the frame body. A press plate is placed on the inner surface of the internal flexible water-stopping member at the small step at the inner end of the frame body, and the frame body and the external flexible water-stopping member are connected with a fastener such as a bolt. A joint for an open channel characterized by fastening an intermediate load-bearing plate and an internal flexible water stop member.