JPH0115735Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention is a flexible joint that shuts off water at the joints of culvert boxes when constructing underground waterways or common ditches by connecting culvert boxes, etc. It is related to.

(b) Conventional technology Conventionally, when constructing waterways or common ditches underground by connecting cylindrical concrete culvert boxes horizontally, formwork was assembled on site, asphalt was used as a joint material, and concrete was sequentially poured. It is formed by pouring and connecting culvert boxes. However, when asphalt is used as a joint material, uneven settlement of the ground creates gaps in the joints, which may cause water leakage.

Therefore, in Utility Model Application No. 58-170431, the present inventor has disclosed a flexible water-stop joint in which a seal made of an elastic material with a V-shaped or U-shaped cross section is attached in a watertight manner to the joint of a culvert box. . Discloses that a filler such as urethane foam is filled inside the V or U shape of the V-shaped or U-shaped seal, and a filler such as sand is filled in the gap of the outer culvert box to prevent the seal from deforming. did.

(c) Problems to be solved by the invention In the above-mentioned conventional culvert box joint, if sand is filled into the gap at the joint of the culvert box outside the seal to prevent deformation of the seal, the joint may be damaged due to earthquakes, etc. There is a limit to the compressibility of the sand when the gap in the culvert box changes rapidly and becomes narrow, and if a large compressive stress is applied, there is a risk that the end face of the culvert box will be destroyed.

Therefore, even if the gap between the joints of the culvert box is suddenly narrowed due to an earthquake, etc., the present invention will not deform flexibly and destroy the end face of the culvert box, and even if the gap widens, An object of the present invention is to provide a water-stop flexible joint for a culvert box joint that maintains watertightness.

(d) Means for solving the problem In order to achieve the above purpose, the present inventor conducted repeated tests and found that an elastic seal with a V-shaped or U-shaped cross section was installed inside the joint of the culvert box, and Fill the inner and outer joints of the U-shape or V-shape of the seal with foamed synthetic resin such as foamed polyurethane resin, and fill at least the bottom outer periphery of the joint of the culvert box with liquid rubber. The inventors discovered that the above object could be achieved by providing a device and completed the present invention.

Next, the content of the present invention will be explained in detail with reference to the drawings. Figure 2 is an end view of the end face of the culvert box provided with the flexible joint of the present invention, and Figure 1 is the same.
It is an AA sectional view. 3 and 4 are enlarged sectional views of the upper and lower parts of FIG. 1. 1 in the drawing
is the culvert box forming waterway 2,
3 is a seal that joins the joint portion 4 of the culvert box. The seal 3 has a retractable portion 5 having a V-shaped or U-shaped cross section as shown in FIGS. 3 and 4.
and a mounting part 6 extending from the upper end of the V-shape or U-shape to both sides, and the mounting part 6 is formed in a shape that matches the inner periphery of the end of the culvert box 1. The entire seal 3 is made of an elastic material such as rubber or synthetic rubber such as chloroprene rubber or ethylpropylene rubber, and a reinforcing cloth or the like may be embedded inside as required.

An annular stepped seal mounting step 7 is formed on the inner periphery of the end of the culvert box, and a seal 3 is attached to this seal mounting step 7 by a presser plate 8 and bolts 9.
The mounting portion 6 of the culvert box 1, 1' is attached in a watertight manner over the entire inner circumference of the end.

Reference numeral 10 denotes an inner filling made of a foamed synthetic resin such as a foamed polyurethane resin filled inside the V-shape or U-shape of the seal 3, which is previously molded to the inside shape of the seal 3 and used by fitting. 11 is seal 3
This is an outer filling made of foamed synthetic resin such as foamed polyurethane resin, which is filled in the joint 4 of the outer culvert box, and is either pre-molded to the outer shape of the seal 3 or injected with liquid urethane resin. Use by foaming and curing on site. Reference numeral 12 is a liquid rubber filling made by filling the outer circumference of the joint 4 of the culvert box with liquid rubber and hardening it. When the joint is filled with a known liquid rubber and hardened at the construction site, the liquid rubber The cured product firmly adheres to the end face 17 of the culvert box. This liquid rubber filling is provided at least in the outer periphery of the joint of the culvert boxes, where the bottom surfaces of the culvert boxes are joined, and is also necessary at the joints on both sides and the top of the culvert boxes, as shown in Figure 5. Established accordingly. Protective plates 13, 13' made of thin metal plates or synthetic resin plates are installed on the inside of the inner packing and the outside of the outer packing in the areas where the liquid rubber filling is not present. are attached to the ends of the joints 4 so as to extend over the joints 4 and overlap at the center of the joints, and on the outside thereof thin elastic plates 14 made of rubber or the like are attached.
are overlaid to protect the outer and inner fillings.

The part where the seal 3 is attached to the seal mounting step 7 inside the end of the culvert box is recessed from the inner surface 15 of the culvert box and disturbs the water flow, so make sure that this part is a uniform surface that continues to the inner surface 15 of the culvert box using epoxy resin, etc. When the filling plate 16 made of synthetic resin is fitted, there will be no obstruction to water flow and the joint will be completely protected.

(e) Effect According to the water-stop flexible joint of the culvert box joint of the present invention, the V-shaped or U-shaped seal 3 is elastic, even if the culvert boxes 1, 1', etc. sink unevenly. It easily follows the expansion, contraction and displacement of the joint part 4, and no unreasonable force is applied to the seal 3.
A watertight state can be maintained. The inner and outer fillings 10 and 11 made of foamed synthetic resin filled into the inner and outer joints of the seal 3 have extremely low density, so even if the gap between the joints 4 changes suddenly due to an earthquake, etc. The end face 17 of the culvert box is not affected by large compressive stress like sand.
No damage. The liquid rubber filler 12 filled at least at the bottom of the joint of the culvert box firmly adheres to the end face 17 of the culvert box, and does not separate even if the gap of the joint 4 is extended by 500% or more, so that the gap is opened. Good water-stopping effect when exposed to water.

If the filling plate 16 is fitted to the seal mounting step 7 on the inner surface of the joint portion 4 so that the surface is even with the inner surface 15 of the culvert box, the inner surface of the water channel 2 formed by the culvert box 1 becomes smooth, and the sealing material will be more securely protected.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of the water-stop flexible joint of the present invention at the joint of a culvert box, and Fig. 2 is a cross-sectional view of the flexible joint of the present invention attached to the end face of the culvert box.
3 and 4 are enlarged sectional views of essential parts of the flexible joint of the present invention, and FIG. 5 is a sectional view of another embodiment of the present invention. 1,1'...Culvert box, 2...Waterway,
3... Seal, 4... Seam part, 5... Expandable part, 6
...Mounting part, 7... Seal mounting step part, 8... Pressing plate, 9... Bolt, 10... Inner filling, 11...
...Outer filling, 12...Liquid rubber filling, 13,
13'... Protection plate, 14... Expandable plate, 15... Culvert box inner surface, 16... Filling plate, 17...
…End face.

Claims (1)

[Scope of claims for utility model registration] (1) 2. Installed across a joint consisting of a narrow gap.
At each opposite end of the culvert box,
The mounting portions of an elastic seal consisting of a V-shaped or U-shaped telescopic portion on the end face and a mounting portion extending from the upper end of the V-shaped or U-shaped portion on both sides are respectively attached in a watertight manner with a holding plate and bolts, and
The inside of the V-shape or U-shape of the seal and the joint on the outside of the seal are filled with an inner filler and an outer filler made of foamed synthetic resin, and at least the bottom of the culvert box is filled with the outer periphery of the joint. A water-stop flexible joint for a culvert box joint, characterized in that a liquid rubber filling made by filling and hardening liquid rubber is provided in the joining part. (2) The water-stopping flexibility of the culvert box joint according to claim 1 of the utility model registration claim, in which the liquid rubber filling is provided on the outer periphery of the joint, where the side or top of the culvert box is joined. Fittings. (3) A water-stop flexible culvert box joint according to claim 1 of the utility model registration claim in which a protective plate made of a thin metal plate or a synthetic resin plate is provided on the inside of the inner packing and the outside of the outer packing. Fittings. (4) An annular stepped part for attaching a seal is provided at the inner end of the culvert box, and the attaching part of the seal is attached thereto, and a filling plate is installed so that the inner surface of the joint part is even with the inner surface of the culvert box. A water-stop flexible joint for a culvert box joint according to claim 1 of the registered utility model claim, which is attached with a water-stop flexible joint.