JPS6027140Y2 - rubber dam - Google Patents

Description

[Detailed description of the invention] This invention relates to a rubber salt used for weirs to take in agricultural water, sea walls at high tides, seawater dams at river mouths, etc.

Acts as a dam for water level adjustment, such as intake of agricultural water and seawater damming at estuaries, by allowing fluids such as air and water to enter and exit.
BACKGROUND OF THE INVENTION Water level adjustment weirs with rubber bags that are easy to install and maintain, so-called rubber salts, have been known for some time.

In general, rubber salt is made by cutting flexible rubber sheets reinforced with plain woven fabric, pasting them together to size, and fixing them airtight to the riverbed or riverbank. Shown in FIGS. 1 and 2.

FIG. 1 is a front view of the rubber salt R seen from the downstream side, and FIG. 2 is a perspective view seen diagonally from above on the upstream side.

The direction of water flow is indicated by arrows in Figure 2. As is clear from Figures 1 and 2, when rubber salt R is spread between riverbanks and inflated to form a weir, the rubber salt R slides at a point between the part where it crosses the riverbed and the part where it spans the riverbank. A phenomenon occurs.

This phenomenon is unavoidable due to the design requirement that the rubber salt must be in close contact with the riverbed and riverbank during lodging.

In conventional rubber salt, due to the sliding phenomenon that occurs during swelling, the weir height at the sliding portion a decreases, and as a result, water leaks from the upstream side to the downstream side at the sliding portion a. The original purpose of the dam, which is to block water flow, is not fulfilled.

Further, when the vicinity of the sliding portion a is exposed to direct sunlight, cracks are likely to occur, which may lead to damage to the rubber salt.

For this reason, in order to suppress the sliding phenomenon as much as possible, improvements have been made to the cutting of the sheet and the way it is attached to the riverbed, but at present, nothing satisfactory has been achieved.

This invention aims to eliminate the above-mentioned drawbacks,
In a rubber salt consisting of a swollen part that becomes tubular by enclosing a fluid and a mounting part that fixes the swollen part to a riverbed across a river, etc., at least the swollen part is reinforced with bias woven fabric. We provide rubber salt with special characteristics.

The rubber salt of this invention will be explained below according to the drawings.

In FIG. 3, numeral 1 is a band-shaped hollow body used to construct the rubber salt of this invention.

As shown in FIG. 4, the band-shaped hollow body 1 has an expanded portion 1a that becomes tubular by filling a fluid such as air or water, and a mounting portion 1b that is integrally provided on one side of the expanded portion 1a and extends in the longitudinal direction. It consists of a bias woven fabric 2 that reinforces the swollen portion 1a.

In order to form the belt-shaped hollow body 1 as shown in FIG.
As shown in the figure, first, two raw raw rubber sheets 3 are placed one on top of the other on a molding press heat platen 4, and a region is defined between the raw raw rubber sheets 3 along the longitudinal direction of the intermediate region. A rubberized bias woven fabric 2 is inserted into the material, a mold release sheet 5 is interposed therein, and a corrected raw rubber 6 forming the mounting portion 1b is inserted as appropriate, and then the pressure heating plate 7 is lowered and the material raw rubber is inserted. The sheet 3 may be pressed between the pressure heating plate 7 and the heating surface plate 4.

The bias woven fabric 2 used to be buried around the bulge 1a to reinforce it is a plain woven fabric made of synthetic fibers such as nylon or Tetron, cut at a predetermined bias angle, and tire reinforcement. This is made by pasting together an even number of blind cords, which are commonly used in the industry, at a desired bias angle.

There are various possible bias angles for the bias woven fabric 2, but it is determined by the slope of the river bank, and is 54°.
It is desirable that the angle is within a range of 44' (rest angle) or less.

FIG. 6 shows a state in which the band-shaped hollow body 1 according to the present invention is fixed to a river bed 8 and a river bank 9 as a rubber weir body, and is inflated by filling the bulge with fluid, as seen from the downstream side.

In order to fix the rubber weir body to the river bed, for example, an anchor bolt buried in the river bed 8 in advance may be passed through a hole provided in the attachment part 1b of the band-shaped hollow body 1, and then screwed with a nut through the abutment plate. .

In this case, the band-shaped hollow body 1 is arranged so that the mounting portion 1b is located on the upstream side.

Next, when a fluid such as air or water is sealed in the swollen part 1a of the band-shaped hollow body 1, the bias woven fabric 2 buried around the swollen part 1a starts to contract, and as a result, as shown in FIG. A rubber weir without sliding portion a is formed.

In order to form such a rubber weir without sliding, the bias angle of the bias woven fabric to be buried is determined as follows.

That is, the cause of the sliding is that, as shown in FIG. 6, the length L of the top of the rubber weir is different from the length of the portion fixed to the riverbed or riverbank (l□+f2 +W).

Therefore, if the bias angle is determined so as to absorb this length difference (11+12+w)-t, no sliding will occur.

In other words, since the length to be shrunk is determined by the slope of the slope and the height of the rubber weir, the bias angle that causes the shrunk to match this can be selected.

For example, when the slope is α (tan α=A), the bias angle may be approximately 45°.

Next, the degree of shrinkage when bias woven fabric is used will be described using an experimental example.

Figure 7 shows a 175 model rubber weir with a length of about 3 m and a height of about 30 cm, in which a nylon bias woven fabric having a bias angle (θ) of 45° with respect to the horizontal direction is buried around the bulge. Four measurement points, including the two points at the top, located approximately in the center, were used as measurement points, and changes in the distance between the points relative to the pressure within the distended portion were measured, and the results shown in the table below were obtained.

From the results in the above table, as the internal pressure of the distended part increases, the bias angle approaches the rest angle (50°44'), shrinking distances A and B in the length direction of the rubber weir, and increasing the height direction C.
, D can be lengthened and height H) can be increased.

This indicates that the bias woven fabric acts to eliminate sliding.

As shown in FIG. 3, when the belt-shaped hollow body 1 is manufactured by belt-shaped integral press molding, when a fluid is sealed in the swollen part,
Due to the effect of the buried bias woven fabric 2, folds are formed in the tongue portion 1c as shown in FIG. 4.

These folds have a sufficient effect in draining the dammed water, and as a result, vibration of the rubber dam body is suppressed, noise prevention and durability are improved.

In the illustrated example, the rubber dam body is manufactured by belt-shaped integral press molding, so it has excellent airtightness, can easily be made to any thickness, and is easy to construct, and can quickly take on a flat shape when it is toppled. It has excellent advantages such as not interfering with water flow in any way, and furthermore, a bias woven fabric can be easily interposed around the bulge, and it is also easy to embed a plurality of bias woven fabrics as required.

This invention is not limited to the illustrated rubber weir, but can also be applied to a rubber weir in which a bag body is formed by on-site processing of a rubber sheet reinforced with bias woven fabric.

In the comb salt of this invention, by reinforcing at least the periphery of the bulge where the fluid is sealed with bias woven fabric, the length of the comb salt shrinks as the fluid is pumped into the bulge. The unavoidable rubbing phenomenon of the surface of comb salt can be completely prevented.

Therefore, it is possible to prevent the leakage of water from the upstream side to the downstream side at the sliding part and the occurrence of cracks, maintain an appropriate height of the weir, and create a rubber weir with good weather resistance, making it practical. It is extremely excellent.

[Brief explanation of the drawing]

Figures 1 and 2 are a front view and a perspective view, respectively, of a conventional comb salt, Figure 3 is a perspective view of a belt-shaped hollow body constituting the invented comb salt, and Figure 4 is a belt-shaped hollow body of Figure 3. Fig. 5 is an explanatory diagram showing the manufacturing process of the belt-shaped hollow body shown in Fig. 3, and Fig. 6 shows the state in which the Qom salt of this invention is installed on a riverbed. FIG. 7 is a front view showing the comb salt used in the experiment. 1... Band-shaped hollow body, 2... Bias woven fabric, 3... Material raw rubber sheet, 4...
Heat surface plate, 5...Release sheet, 6...Correction raw comb, 7...Pressure heating plate, 8...River bed, 9... ····river bank.

Claims (1)

[Scope of utility model registration request] In a rubber salt consisting of a swollen part that becomes tubular by enclosing a fluid and a mounting part that fixes the swollen part to a riverbed across a river, etc., at least the swollen part is reinforced with bias woven fabric. Characteristic rubber salt.