JPS5873609A - Rubber dam - Google Patents

Abstract

PURPOSE:To raise the durability of a rubber dam by a method in which two double rubber strips are bonded the selvages with each other over the whole longitudinal direction on their one sides to form a rubber dam body, and the selvages of opened side of the rubber dam body is fixed to the bad and bank of a river by using fitting metals. CONSTITUTION:The selvages of two doubled rubber strips 3 and 4 are bonded with each other over whole longitudinal direction on their one sides to form a rubber dam body 1. Then, the opened side of the rubber dam body 1 is positioned toward the upstream side, the hole provided in the selvages of opened side of the rubber dam body is connected with an another bolt 6 buried in the river bed 5, and a push plate 7 is contacted with the selvages of the rubber dam body and fixed airtightly by nuts 8. Then to fix the dam body to the bank of the rever, both ends of the rubber dam body 1 are slantly cut off toward the downstream side, and the opened sides are airtightly attached by means of the anchor bolt 6, the push plate 7, and nuts 8 as in the case of the river bed 5.

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 iron overturning weir is operated by a hydraulic cylinder or other means, maintenance work is extremely difficult and difficult, and it also has the disadvantage that it cannot be installed on soft ground.

Therefore, in recent years, a water level A'M weir, a so-called rubber weir, has been developed and put into practical use, which is activated by the direct flow of fluid such as air or water, and consists of a rubber bag body that is easy to install and maintain. has been done. However, conventional rubber weirs were constructed by constructing rubber sheets in the form of bags on site, as shown in Figures 1 and 79, so it was not possible to use thick rubber sheets from the viewpoint of workability. This forces the rubber weir to be affected by trauma caused by driftwood, rolling stones, etc., and when it is relaxed as shown in d4Bwi,
There was a drawback that the downstream part shown by is always in a state of being cracked, easily cracking and other problems occur, and durability is poor.

The purpose of this invention is to eliminate the above-mentioned drawbacks and to provide a rubber dam that is not easily affected by external trauma and is less prone to cracking. , their negative sides are joined over the entire length to form a rubber weir body, and the open side of the rubber weir body is airtightly fixed to the riverbed ν and the riverbank by means of mounting fittings.

The rubber salt of the present invention will be described below with reference to the drawings.

Here, the rubber base $4cl is two overlapping strips 3
．． In order to form such a rubber weir body l, which is formed by joining two strips 8.4 along their entire length at one side thereof, for example, two strips 8.4 are placed on a hot surface plate of a forming press. Raw rubber sheets made of raw materials are placed one on top of the other, and a II shape material is interposed between these raw rubber sheets along the entire length, leaving only one side of the sheets, and once the raw rubber sheets are vulcanized. Press vulcanize. At this time, a desired reinforcing layer can be obtained by appropriately embedding the canvas in the raw rubber sheet.

By manufacturing in this way, the rubber base 41 can be formed to a desired length, so that it can always be well adapted to rivers where standardization is not possible. Furthermore, since it is formed by integral press molding, there is an advantage that the thickness of the band-shaped body of 8°t can be freely selected.

Next, a method of fixing this rubber base i11 to the river bed ν and the river bank will be described.

FIG. 4 shows an example of this, in which anchor bolts 6 are placed with the open side of the rubber weir body l facing upstream (the direction of flow is indicated by arrow A in the figure), and then buried in the riverbed 5 in advance. Fit the hole provided on the open side of the plate, then press the presser plate 7 onto the side and attach it airtight with the nut 8.Furthermore, fixing to the river bank 9 is as shown in Figure 5g5. Then, cut both ends of the rubber weir body l diagonally toward the downstream side, and attach the open side part airtightly with anchor bolts, retaining plates, and nuts in the same way as in the case of the river bed 5. In this way, the river bed' For example, as shown in Fig. 6, the air inlet to the rubber weir main body l attached to the river bank 9 can be made by inserting a flange Io with a nipple at an appropriate position between the strips 8.4. It can be constructed by fixing it with a pair of presser members 11 having semicircular bowl portions. Of course, the mounting 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 also be the part that corresponds to the river bank, which is the end thereof.

FIG. 7 is a sectional view showing a state in which a fluid such as air or water is sealed into the rubber weir body l through the injection port as described above to expand the rubber salt. Since the rubber salt formed in this way has a thick main body strip 8.4, it is not susceptible to damage caused by driftwood or the like, and furthermore, the joint 1g of the strips 8 and 4 is difficult to drain. Since the rubber salt does not vibrate, the rubber salt does not suffer from rubber fatigue due to vibration, and has a reliable damming effect. Furthermore, when the rubber salt is relaxed, the strips 8.4 are both flattened with the joint 12 as a boundary as shown in FIG. The bag lies flat on the river bed without causing any stress, so it never cracks due to stress, unlike conventional sheet bags.

Furthermore, the thick band 8 can reliably prevent the effects of external trauma caused by rolling stones or the like during relaxation, as mentioned above.

FIG. 8 is a sectional view showing a modification of the present invention, in which the width of the upper strip 8 of the strips 8.4 forming the rubber weir body 1 is determined by the width of the lower strip 4. When installing it on a river bed 5, etc., the open side edges of the rubber weir body L should be aligned and fixed.

By positioning the highly rigid strip 8.4 in this way, a space lδ penetrating the inside of the rubber weir is always formed even when the rubber salt is relaxed, and the injection port is located on one side of the rubber salt. Even when the rubber salt is provided only at the end, incomplete relaxation of the rubber salt due to water pressure can be prevented.

This space 18 also serves as a cushioning material against impacts caused by rolling stones and the like.

Furthermore, in this embodiment, since the strip t1114 having an arcuate cross section is provided adjacent to the joint portion 12, the communication effect at the time of relaxation described above is further ensured.

When enclosing fluid to expand the rubber salt, the joint 12
The durability of the rubber salt can be improved by dispersing stress in the vicinity of . The two-strip groove 14 can be easily formed by interposing a piece of nylon zelkova or the like between the strips 8 and 4 during manufacturing, and the nylon piece 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 8 of the band 8.4 forming the rubber weir body l is compared with that of the weight of the band. It is widened and its open side edges are individually fixed to the river bed 5v and the river bank 9.

As described above, the rubber weir body of the present invention is configured in advance to have the same flat shape as the relaxed shape of the rubber salt, and there is no need for on-site processing such as bending during installation. Gum salt can be easily obtained,
As a result, the weir is less likely to be affected by external trauma.11.
When the rubber salt expands, the rubber salt does not vibrate due to the draining action of the joints and exhibits a stable dam-stopping effect, and when it relaxes, no special stress is generated in any part of the rubber dam body.・L of occurrence of cracks etc.
・Durability can be improved considerably as there is no need for metal parts.

[Brief explanation of drawings]

Figure i1 and Figure 8 are sectional views showing a conventional rubber salt, and Figure 8 is a perspective view showing the rubber dam body of the present invention. @Figure 4 is a cross-sectional view showing the rubber salt of this invention. Fig. 5 is a perspective view showing how the main body of the rubber weir of the present invention is attached to the river bed ν and the riverbank, Fig. 6 is a perspective view showing an example of an air inlet, and Fig. 7 is a perspective view of the rubber salt of the present invention. 8 and M9 are cross-sectional views showing modified examples of the present invention. 1...Rubber weir body 2...Canvas 8.4...
Band-shaped body 5... River bed 6... Anchor bolt )... Holding plate 8... Nut 1.・・□゛
9...River bank lO...with nipple 7 '7''','>
11... Pressing member 12... Joint part
18... Space portion 14... Groove. Figure 5 Figure 6 Figure 8 Heel 1 9th Shil

Claims (1)

[Claims] L The two recombined strips are joined along their entire length at their negative sides to form a rubber weir body, and the open side of the rubber weir body is attached to the river bed 2 and river bank using a mounting bracket. A tightly fixed rubber weir.