JPH084094A - Flexible water stop board for joint of concrete structure - Google Patents

Abstract

PURPOSE:To prevent the occurrence of a cracking, the separation of a joint part, and the like so as to improve the water stop performance and durability since stress concentration can be relaxed even if the stress is concentrated on a right-angled corner part by the own weight of a water stop board main body. CONSTITUTION:A water stop board main body 11 in the sectional form is constituted of a hollow center part 12 formed into approximately hexagonal cross section, and sheet-like embedded parts 13a, 13b formed continuously on both sides of the center part 12. This water stop board main body 11 is used with the angle part of the center part 12 placed on the inside and with the trapezoidal part placed on the outside, and a curved face part of circular arc shape with a radius of 10mm-30mm is formed at the angle part of the right-angled corner part of the water stop body 11 supposing the fitting construction time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible water stop plate for a joint of a concrete structure buried in a drainage channel, a common channel for an irrigation channel, and the like, and more particularly to a stop formed in a rectangular shape and an endless shape. The present invention relates to a flexible water stop plate for a joint of a concrete structure, which effectively prevents stress from concentrating inside the corner portion of the water stop plate body when the water plate body is attached.

[0002]

2. Description of the Related Art Conventionally, a box culvert used for a drainage channel, an irrigation channel, etc. (Culvert refers to a structure provided under a road or in a ground to obtain a space for a road, a channel, etc .: a corporation. As a flexible water stop plate for seams (edited by the Japan Road Association), the box culvert is molded endlessly with a rubber-like elastic member, and the box culvert is mainly formed in a hollow cross section. The water blocking plate body 1 embedded in the end face of the above has a structure having a right-angled corner portion R as shown in FIG.

As shown in FIG. 5, the water blocking plate body 1 is attached to the water blocking plate body 1 made of a flexible material by connecting a wire 2 or the like to one side of the water blocking plate body 1 and suspending it with a crane or the like. As shown in FIG. 6, it is suspended in the underdrain 3 excavated on the road surface. In order to place concrete G on the lower side (bottom part), the water blocking plate body 1 is installed by assembling a braided bar 4 with reinforcing bars 4a below the bottom and side walls, and the bar 4 is drawn. As shown in FIG. 6 and FIG. 7, the mounting holes 5 provided in the water blocking plate body 1 are used to assemble and fix.

Then, concrete G is cast once to the reinforcing bar 4 at the bottom of the water blocking plate body 1 to a height of about 1 m. Then, after that, similarly to the above, the knitted bar arrangement 4 is sequentially assembled from the bottom by the reinforcing bars 4a, concrete G is placed, and one side of the water blocking plate body 1 as shown in FIG. To build. After building one box culvert 6,
The other box culvert to be connected to is constructed in the same order as described above, but it is also possible to pour concrete G while simultaneously constructing the bar culverts 6 facing each other and arranging the reinforcements 4.

[0005]

By the way, when the water blocking plate body 1 is mounted as described above, the underdrain is hung while the water blocking plate body 1 formed in the endless shape as described above is suspended. In order to hang it in the inside of 3, the stress δ such as a tearing force is applied to the right-angled corner portion R by its own weight W of the water blocking plate body 1.
However, there is a problem in that the water resistance is impaired by the occurrence of cracks and the like.

Further, the water blocking plate main body 1 is formed by cutting a strip-shaped one into a predetermined length and processing it into an endless shape. If provided, its own weight W when suspended as described above
As a result, the stress δ concentrates on the joint portion, that is, the right-angled corner portion R, which causes peeling or the like. The present invention
It was devised in view of such a conventional problem.By forming the inside of the right-angled corner portion of the water blocking plate body into an arc-shaped curved surface portion to reinforce it, the right angled corner portion is formed by the weight of the water blocking plate body. Even if stress is concentrated on the concrete, the stress concentration can be relieved, so it is possible to prevent cracks, peeling of joints, etc., and to improve water resistance and durability. It is an object of the present invention to provide a flexible water stop plate for seams.

[0007]

In order to achieve the above object, the present invention provides an endless flexible water stop plate which is embedded along a joint portion of a concrete box having a hollow cross section, The gist is that an arcuate curved surface portion is formed inside the corner portion or inside the T-shaped portion of the water blocking plate body. The arcuate curved surface portion is formed with a radius of 10 mm to 30 mm.

[0008]

The present invention is constructed as described above, and when the inside of the right-angled corner portion of the water blocking plate body is formed into a curved surface portion having an arc shape to reinforce it, when the water blocking plate body is suspended, Stress such as tearing force is concentrated on the right-angled corner due to the weight of the water blocking plate itself, but by forming the inside of the right-angled corner into an arc-shaped curved surface as described above, tensile force acts and stress concentration. Can be alleviated. Since the strength of the rubber-like elastic member, that is, the tensile force, is about 5 times as much as the tearing force, the load bearing property is improved by that amount, and the durability of the water blocking plate body can be improved. .

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The same components as those in the conventional example are designated by the same reference numerals and the description thereof will be omitted. FIG. 1 is a front view of a water blocking plate body 11 embodying the present invention, and FIG. 2 is about 20 mm to 30 mm.
1 is a cross-sectional view taken along the line AA of FIG. 1 showing a water blocking plate main body 11 embedded in a seam portion Z of a box culvert 6 that is arranged to face each other with a gap of mm between the water blocking plate main body 11 Is formed in a band shape by a rubber-like elastic member such as rubber, and is formed in an endless shape corresponding to the circumferential length of the end surface of the box culvert 6.

As shown in FIGS. 3 and 4, the cross-sectional shape of the water blocking plate body 11 in this embodiment is a hollow central portion 12 formed in a substantially hexagonal cross section and continuous on both sides thereof. Sheet-like buried portions 13a and 13b formed by the above, the mountain portion 12a of the central portion 12 is used as the inner side, and the trapezoidal portion 12b is used as the outer side.
In the mountain-shaped portion 12a of the right-angled corner portion 1 of FIG. 1, an arc-shaped curved surface portion 1 with a radius of 10 mm to 30 mm is presumed for installation.
4 (see FIG. 1) are formed.

The radius of the curved surface portion 14 having an arc shape is the same as that of the slide bar 4 which is constructed at the same time when the water blocking plate body 11 is attached.
Considering the position of b, 10 mm to 30 mm is preferable, and the radius is 3
If it is 0 mm or more, it comes into contact with the slide bar 4b. The arc-shaped curved surface portion 14
Even if the stress δ such as the tearing force is concentrated on the right-angled corner portion R due to the weight of the water blocking plate body 1, the arc-shaped curved surface portion 14
Since a tensile force acts on, stress concentration can be relaxed. By the way, since the strength of the rubber-like elastic member constituting the water blocking plate body 1, that is, the tensile force is about 5 times as much as the tearing force, the load bearing property is improved correspondingly, and the water blocking plate body 1 The durability can be improved.

Further, the sheet-like embedded portions 13a, 13
A plurality of ribs 15 (two ribs in this embodiment) are formed in the longitudinal direction in b to increase the rigidity, and the embedded portion 1
A plurality of mounting holes 5 to be mounted on the reinforcing bar 4a are formed at the side edges of 3a and 13b. The water blocking plate body 11
As shown in FIGS. 3 and 4, it is preferable that the central portion 12 has a hexagonal cross section,
The size of the central portion 12 is determined by the amount of mutual deformation of the box culverts 6.

As described above, according to the present invention, when the water blocking plate body 11 is suspended by forming the inside of the right-angled corner portion R of the water blocking plate body 11 into the arc-shaped curved surface portion 14 for reinforcement. Although the stress δ such as the tearing force is concentrated on the right-angled corner portion R due to the weight of the water blocking plate body 11, the tensile force can be increased by forming the inside of the right-angled corner portion R into the arc-shaped curved surface portion 14 as described above. Acts to reduce stress concentration. Further, as shown in FIG. 2, by arranging the water blocking plate body 11 so as to be embedded between the box culverts 6, water will not leak even when the box culverts 6 are displaced back and forth and left and right. .

[0014]

As described above, the present invention is an endless flexible water stop plate which is embedded along the seam of a box culvert having a hollow cross-section rectangular shape as described above. Since an arcuate curved surface is formed inside the corner or inside the T-shaped part, even if stress concentrates on the right-angled corner due to the weight of the water blocking plate body, stress concentration can be relieved, so cracks, etc. There is an effect that it is possible to prevent the occurrence of cracks and peeling of the bonded portion, and to improve the waterproofness and the durability.

[Brief description of drawings]

FIG. 1 is a front view of a water blocking plate body embodying the present invention.

FIG. 2 is a cross-sectional view taken along the line AA in FIG. 1 of the water blocking plate main body embedded in the joint portion of the box culvert.

FIG. 3 is a partial cross-sectional view of a water blocking plate body embodying the present invention.

FIG. 4 is a partial cross-sectional view of a water blocking plate body showing a modified example of the present invention.

FIG. 5 is an explanatory view showing a state in which a conventional water blocking plate body is suspended.

FIG. 6 is an explanatory diagram of a case where a conventional water blocking plate body is installed in an underdrain.

7 is an enlarged perspective view of a portion X in FIG.

FIG. 8 is an explanatory view showing a state in which the water blocking plate body is installed in the underdrain, and the reinforcing bars are arranged and concrete is partially placed.

FIG. 9 is an explanatory diagram showing a state in which a box culvert in which concrete is partially cast is constructed.

[Explanation of symbols]

 4a Reinforcing bar 4a Slide bar 6 Box culvert 11 Water stop plate body 12 Central part 12a Mountain part 13a, 13b Embedded part 14 Curved part R Right angle corner part δ Stress

Claims (2)

[Claims] 1. An endless flexible water stop plate which is embedded along a joint of a box culvert having a hollow cross section and has a corner inner side or a T-shaped part inner side of the water stop plate main body. A flexible water stop plate for a joint of a concrete structure, characterized in that an arcuate curved surface portion is formed on the. 2. A radius of 10 mm to 3 in the arcuate curved surface portion.
The flexible water stop plate for a joint of a concrete structure according to claim 1, which is formed to have a thickness of 0 mm.