JPS6037245B2 - rubber dam - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in rubber dams used for intake of agricultural water, sea walls during high tides, seawater dams at river mouths, and the like.

Steel automatic overturning weirs have long been known as weirs for adjusting water levels, such as taking in agricultural water and damming seawater at river mouths.

However, since this steel automatic overturning weir is operated by hydraulic cylinders or other means, maintenance work is extremely difficult, and furthermore, it is impossible to install on soft ground. Therefore, in recent years, a so-called rubber weir, a water level adjustment weir consisting of a rubber bag body that is operated by direct intake and withdrawal of fluids such as air and water and is easy to install and maintain, has been developed and put into practical use.

However, as shown in Figures 1 and 2, conventional rubber weirs were constructed by constructing rubber sheets in the form of bags on site, so it was not possible to use thick rubber sheets from the viewpoint of workability. This forces the rubber dam to be affected by damage caused by driftwood, rolling stones, etc., and when the dam is relaxed as shown in Figure 2, the downstream part indicated by a in the figure is constantly bent. It has the drawback that it is prone to cracking and other problems and is poor in durability. The object of this invention is to eliminate the above-mentioned drawbacks and provide a rubber dam that is less susceptible to external damage and less prone to cracking.
The gist is that two overlapping strips are joined along their entire length at their negative sides to form a rubber weir body,
The rubber weir has an open side portion of the rubber weir main body airtightly fixed to the cargo bed and river bank by means of mounting fittings.

The rubber weir of the present invention will be explained below based on the drawings.

In FIG. 3, 1 is the rubber weir body, and 2 is a canvas for reinforcing the rubber weir body.

Here, the rubber weir body 1 is made up of two overlapping strips 3 and 4.
are joined along their entire length on one side.

To form such a rubber weir body 1, for example, two raw raw rubber sheets as the strips 3 and 4 are placed one on top of the other on a hot surface plate of a molding press, and between these raw raw rubber sheets, A release agent is interposed along the entire length, leaving only one side, and press vulcanization is performed at the vulcanization temperature of the raw rubber sheet. At this time, if the canvas is properly embedded in the raw rubber sheet, a desired reinforcing layer can be obtained. By manufacturing in this way, the rubber weir body 1
Since it can be formed to a predetermined length, it can always be well adapted to rivers that cannot be standardized.

Also, since it is formed by integral press molding, the band-shaped body 3,
There is also the advantage that the thickness of 4 can be freely selected. Next, a method for fixing this rubber weir body 1 to the riverbed and riverbank will be described.

FIG. 4 shows an example of this, in which the open side of the rubber weir body 1 is positioned facing upstream (the direction of flow is indicated by arrow A in the figure), and then anchor bolts 6 are buried in the riverbed 5 in advance. Then, the holes provided in the open side sides are aligned, and the presser plate 7 is placed on the side part and attached airtightly with nuts 8.

Furthermore, to secure it to the riverbank 9, as shown in FIG. Attach airtight using a holding plate and nuts. The air inlet to the rubber weir body 1, which is attached to the river bed 5 and the river bank 9 in this way, can be made by inserting a flange 10 with a nipple at an appropriate position between the strips 3 and 4, as shown in FIG. 6, for example. This can be constructed by fixing this with a pair of presser members 11 having semicircular curved parts.

It goes without saying that the installation position of the air inlet is not limited to the part of the rubber weir body 1 that corresponds to the river bed, but may be the part that corresponds to the end of the river bank. FIG. 7 is a sectional view showing a state in which the rubber weir is expanded by sealing fluid such as air or water into the main body of the rubber weir from the above-described injection port.

The rubber weir formed in this way has a belt-like body 3,
4 is thick, so it is less susceptible to damage caused by driftwood, etc. Furthermore, since the joint 12 between the strips 3 and 4 acts as a drain, vibrations do not occur in the rubber weir, thus reducing rubber fatigue caused by vibrations. This prevents this from occurring and provides a stable damming effect. Also, when this rubber dam is relaxed, Fig. 4
As shown in FIG.
Since both of the rubber weir body 1 is constructed to be flat, the rubber weir body 1 is located flat on the river bed without any special stress. Therefore, unlike conventional sheet bags, cracks due to stress generation never occur. Furthermore, as mentioned above, the thick band 3 can reliably prevent the effects of external trauma caused by rolling stones or the like during relaxation. 8th
The figure is a cross-sectional view showing a modification of the present invention, in which the width of the upper strip 3 of the strips 3 and 4 forming the rubber weir body 1 is determined by the width of the lower strip 4. When installing it on the floor 5 etc., align the open side green of the rubber weir body 1 and fix it.

By positioning the highly rigid strips 3 and 4 in this way, a space 13 penetrating the inside of the rubber weir is always formed even when the rubber weir is relaxed, and the injection port is located at one end of the rubber weir. Even when the rubber weir is provided only in one portion, incomplete loosening of the rubber weir due to water pressure can be prevented.

This space 13 also serves as a cushioning material against impacts caused by rolling stones and the like. Furthermore, in this embodiment, since the groove 14 having an arcuate cross section is provided adjacent to the joint 12, the above-mentioned lotus effect during relaxation is further ensured, and the fluid is sealed. When expanding the rubber dam, stress can be dispersed in the vicinity of the joint 12, thereby improving the durability of the rubber dam.

Note that the grooves 14 can be easily formed by interposing a nylon rod or the like between the strips 3 and 4 during manufacturing, and the nylon rod can be easily removed because the rubber weir body 1 is open on one side. can do. FIG. 9 shows another modification of the present invention, in which the width of the upper band 3 of the bands 3 and 4 forming the rubber weir body is significantly wider than that of the band 4. Each open side edge is individually connected to the river bed 5.
and those fixed to the river bank 9.

As mentioned above, according to the rubber weir of the present invention, the rubber weir main body is configured in advance to have the same flat shape as the relaxed shape of the rubber weir, and there is no need for on-site processing such as bending during installation. rubber weir can be easily obtained,
This makes the weir less susceptible to trauma.

Furthermore, ``When the rubber dam expands, the weir does not vibrate due to the draining action of the joints and can exert a stable dam-stopping effect, and when it relaxes, no special stress is generated in any part of the rubber dam body. Since there is no fear of cracks occurring due to this, durability can be significantly improved.

[Brief explanation of the drawing]

1 and 2 are cross-sectional views showing a conventional rubber weir, FIG. 3 is a perspective view showing a rubber weir body of the present invention, FIG. 4 is a cross-sectional view showing a rubber weir of the present invention, and FIG. A perspective view showing how the rubber weir main body of the present invention is attached to the same floor and river bank, No. 6
FIG. 7 is a perspective view showing an example of an air inlet, FIG. 7 is a cross-sectional view showing an expanded state of the rubber dam of the present invention, and FIGS. 8 and 9 are cross-sectional views showing modified examples of the present invention. 1...Rubber weir body, 2...Canvas, 3,
4... Band-shaped body, 5... Riverbed, 6...
... Anchor bolt, 7... Holding plate, 8...
... Nut, 9 ... River bank, 10 ... Flange with nipple, 11 ... Pressing member, 23 ... Joint part, 13 ... Space part, 14 ... ...Groove. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9

Claims (1)

[Claims] 1. Two overlapping strips are joined along their entire length at one side to form a rubber weir body, and the open side of the rubber weir body is attached to the riverbed and river bank using a mounting bracket. A rubber dam that is tightly fixed.