JPH0742690B2 - Flexible membrane weir - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible membrane weir generally called a rubber weir used for a weir for intake of agricultural water.

2. Description of the Related Art In a rubber weir 01 having a smooth outer peripheral surface as shown in FIG. 10, a water flow overflowing the rubber weir adheres to a low point A on the downstream surface of the rubber weir. It was peeled off from the surface of the rubber weir in the vicinity of A.

In the vicinity of the separation point A of this water flow, the external pressure that acts on the surface of the rubber weir acts as a negative pressure, so the upstream water level increases due to the height of the weir, and when the energy of the water flow that overflows the rubber weir increases, As the negative pressure increased, the position of the separation point A fluctuated due to slight turbulence of the flow, and the rubber dam was vibrated.

In addition, as shown in FIG. 11, there was a defect that the bent portion bulged during the fall and the stone was locally damaged or worn due to a boulder or the like.

Therefore, a rubber weir has been considered, which is a plate-shaped bag body in which two rubber sheets are vertically stacked and side edges thereof are integrally molded.

This is because there is no swelling due to bending when lying down, and when standing up, the integrally molded side edges form a ridge 02 across the river width as shown in Fig. 12, and the water flow that overflows the rubber weir 01 is always the same. Since it is forcibly separated from the rubber weir 01 by the ridges 02, it is possible to prevent the vibration of the rubber weir due to the change of the separation point.

Problems to be Solved by the Invention However, since the force applied to the ridge 02 by the water flow is considerably large, a certain amount of strength is required.

In particular, the ridge 02 is weaker than other main body parts when the rubber weir itself becomes large, and thus requires some kind of reinforcement.

In addition, since the main body of the conventional rubber weir is directly exposed to the water flow,
There was a problem in abrasion resistance and impact resistance because it directly received the collision of boulders and driftwood.

The present invention has been made in view of the above point, and an object of the present invention is to cover a flexible film structure in which a ridge is formed on a flexible film main body so that a vibration of a flexible film weir is generated. It is possible to provide a flexible membrane weir capable of preventing the above-mentioned problems and strengthening the ridges and preventing damage to the main body of the flexible membrane weir at a low cost by a simple installation work.

Means and Actions for Solving Problems The present invention relates to a flexible membrane weir that is laid across a river and stands up by feeding in a fluid and falls down by discharging the fluid. The entire outer surface of the flexible membrane body is covered with the flexible membrane structure without being integrated with the flexible membrane body, and the overlapping both ends of the flexible membrane body are covered with the flexible membrane structure. Both ends of the object are clamped, and the clamps are fixed together on the river bed by a fixture, and the flexible membrane structure stands up along with the standing of the flexible membrane main body and is perpendicular to the river flow on the surface. It is a flexible membrane weir in which one ridge oriented in the direction of is formed.

Therefore, the main body is not directly damaged by boulders and driftwood, and by selecting a structurally strong flexible membrane structure, it is possible to strengthen abrasion resistance and impact resistance and strengthen the ridges. It also has the effect of preventing vibration.

Moreover, since both ends of the flexible membrane structure are sandwiched between both ends of the flexible membrane structure and the sandwiched portions are fixed to the river bed together by the fixing tool, the fixing tool only needs to be provided at one place, The installation work is easy without requiring labor and time, the cost can be reduced, and the maintenance is easy.

Embodiments Embodiments according to the present invention shown in FIGS. 1 to 5 will be described below.

In the rubber weir 1 in this embodiment, a bag-shaped rubber sheet 2 which is the main body is covered with a protective rubber sheet 3 having projections 4 on its surface (see FIG. 2), and the respective edge portions 2a, 3a are It is fixed on the riverbed surface all at once.

Concrete is driven into the riverbed where the rubber weir is laid, and the rubber sheet 2 is stretched over the top surface 5a of the concrete riverbed 5 and the slopes 5b adjacent to both banks of the river as shown in FIG.
Also, the edge portions 2a, 3a of the protective rubber sheet 3 are arranged toward the upstream side, the presser foot 6 is applied to the edge portion and the anchor bolt 7 is driven and fixed with the nut 8 to collectively form the concrete layer. Fix it firmly.

Therefore, the fixtures such as the anchor bolt 7 and the presser foot 6 need only be provided at one place, the number of parts is small, and the installation work does not require labor and time, and is easy and inexpensive.

In addition, maintenance is easy.

The inside of the main body of the rubber sheet 2 is kept airtight, so that the rubber sheet 2 stands up when a fluid is fed in and falls down when it is discharged.

A slight margin should be provided between the rubber sheet 2 and the protective rubber sheet 3 so that the protective rubber sheet 3 can expand when the rubber sheet 2 expands.
Make sure that no tension is applied to the.

The rubber sheet 2, which is the main body of the rubber dam, has a structure in which raw rubber is impregnated into a reinforcing layer 9 made of a plurality of woven fabrics or fiber cords made of cotton, synthetic fibers or the like and vulcanized and molded (fourth). See figure).

Therefore, when the fluid is sent into the rubber sheet 2 and expanded, the reinforcing layer 9 has a structure that is strong against tensile force.

The ratio of the reinforcing layer 9 to the rubber sheet 2 is large and the tensile strength is excellent.

On the other hand, in the protective rubber sheet 3, the tensile strength is not a serious problem, and the proportion of the reinforcing layer 10 made of synthetic fiber or the like may be small (see FIG. 5), and the rubber sheet 2 may be protected by boulders or driftwood. It can be protected from direct abrasion impact and the like.

Further, in order to make the protective rubber sheet 3 itself excellent in abrasion resistance and impact resistance, by inserting the wire chip 11 near the surface of the protective rubber sheet 3 as shown in FIG. The above performance can be improved.

In particular, it is strong against usually fatal damage such as knife cutting due to mischief, and can withstand damages due to collisions such as boulders and driftwood, and can firmly protect the rubber sheet 2.

Therefore, as shown in FIG. 7, it is possible to sufficiently protect the rubber sheet 2 even if a rolling stone or the like collides with the bent portion on the downstream side being slightly raised when the rubber weir falls.

Further, as shown in FIG. 8 and FIG. 9, it is conceivable that the wire 12 is inserted into the protective rubber sheet 3 so as to be oriented in the direction of water flow and integrally molded.

By thus inserting the wire 12 in the direction of water flow, it becomes more resistant to shocks and increases in rigidity, so that the protrusions 4 become stronger and can withstand the water flow even when the rubber dam is large and the flow rate is high.

Further, the rigidity of the entire protective rubber sheet 3 is increased, so that it effectively acts to prevent vibration.

EFFECTS OF THE INVENTION The present invention has a structure in which the main body of a flexible membrane weir is covered with a protective flexible membrane structure having a ridge on the surface thereof, so that vibration can be prevented even when the flexible membrane weir is enlarged. It is possible to firmly maintain the ridges of.

Further, the flexible membrane weir main body can be protected from the collision of boulders and driftwood, and the durability can be improved.

Furthermore, the flexible membrane weir body can be protected from damage such as knife cutting.

Since both ends of the flexible membrane structure are sandwiched between the both ends of the flexible membrane structure and the sandwiched portions are fixed to the river bed together by the fixing tool, the fixing tool may be provided at only one place. The work is easy without requiring labor and time, cost can be reduced, and maintenance is also easy.

[Brief description of drawings]

FIG. 1 is a sectional view of a rubber weir at the time of standing according to an embodiment of the present invention, FIG. 2 is a view showing a state in which a rubber sheet for protection is combined with a rubber weir body of the embodiment, and FIG. 3 is the same. FIG. 4 is a cross-sectional view showing the structure of the rubber sheet of the main body of the rubber weir, and FIG. 5 is the structure of the protective rubber sheet of the rubber weir. 6 is a sectional view showing the structure of a protective rubber sheet according to another embodiment,
FIG. 7 is a sectional view showing a state in which the rubber weir falls in the same embodiment, FIG. 8 is a sectional view showing a structure of a protective rubber sheet in another embodiment, and FIG. 9 is a standing view of the same embodiment. FIG. 10, FIG. 11, FIG. 11 and FIG. 12 are cross-sectional views of a conventional rubber weir, showing such a situation. 1 ... rubber weir, 2 ... rubber sheet, 3 ... protective rubber sheet,
4 ... Projection, 5 ... Concrete riverbed, 6 ... Presser foot, 7 ... Anchor bolt, 8 ... Nut, 9, 10 ... Reinforcing layer, 11 ... Wire tip, 12 ... Wire.

Claims (1)

[Claims] 1. A flexible membrane weir that is laid across a river or the like and stands up by the inflow of a fluid and falls down by discharging the fluid. Outside the flexible membrane main body that stands up and down by the inflow and outflow of the fluid. The entire surface is covered with a flexible membrane structure without being integrated with the flexible membrane body, and both ends of the flexible membrane body are sandwiched by both ends of the flexible membrane structure. The sandwiching part is fixed to the river bed together by a fixture, and the flexible membrane structure stands up along with the standing up of the flexible membrane body, and one surface of the flexible membrane structure is oriented in a direction perpendicular to the river flow. A flexible membrane weir characterized in that a ridge is formed.