JPS626012A - Flexible banded dam - Google Patents

Abstract

PURPOSE:To reduce the cost of construction by a method in which both ends of a lower flexible banded material traversing river in a shape of being bent toward the downstream side and also of being erected on the river bed are supported by a supporter, and the lower elastic modulus of the banded material is made greater than the upper one. CONSTITUTION:A rubber band 18 is formed in such a way that its strength is stepwise lowered from lower part to upper part. The band 18 is traversed river in a shape of being bent toward the downstream side and erected on the riverbed concrete 12. Both ends of the band 18 are coupled with paired supporters 14 to form a flexible banded dam 10.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flexible band layer laid across a river and used for intake of agricultural water, etc.

Rubber weirs (rubber dams) are known, in which a rubber bag-like body is laid across a river and air or water is supplied and discharged into the bag-like body to make it undulate. A weir using a simple band made of flexible material has not yet been known.

By the way, iron gate weirs (commonly known as roller gates) that are installed on rivers, irrigation canals, etc. for the purpose of intake of agricultural water, etc. need to be painted regularly to prevent corrosion of the iron gates. be. To paint, the iron door must be lifted upwards, and in order to maintain the upstream water level during this time, it is common to install a temporary cofferdam on the upstream side of the iron door type layer. .

As this temporary cofferdam layer, sandbags are piled up, or square timbers are stacked vertically in a row along a frame made of H-shaped steel (commonly known as a corner drop weir), etc.

In both cases, a great deal of labor is required to install the sandbags, and in the former case, there is a risk that the piled up sandbags will collapse due to water pressure, while in the latter case, the holes for installing the frame must be pre-formed in the riverbed. must be kept,
Riverbed construction is troublesome.

1. The object of the present invention is that it can be used as a temporary cofferdam instead of a main weir, or as a wooden weir itself, and has a simple structure.
The present invention also provides a flexible band weir with low construction costs.

The purpose of this is to use a flexible band whose lower part has a larger elastic modulus than its upper part, and by supporting both ends of the flexible band with a pair of supports, the flexible band can be bent downstream. This is achieved by installing the bridge vertically on the riverbed and across the river.

By making the elastic modulus of the lower part of the flexible band larger than that of the upper part, uneven deformation due to water pressure is prevented, and when in use, the flexible band can be placed in an upright position with a slight incline toward the downstream side. By maintaining a flexible band, water pressure can be used to prevent it from lifting off the riverbed.

Hereinafter, one embodiment of the present invention shown in FIGS. 1 to 4 will be described.

Figure 1 shows a flexible band weir 10 laid across a river.
is shown as a perspective view, and the flexible band weir 10 includes a river bed concrete 12, a pair of supports 14 (piers) erected at intervals, and both ends of the supports 14. The rubber band 18 is disposed across the river in a curved shape toward the downstream.

The rubber band 18 is a laminate whose lower part is stronger than the upper part, and is made of a first-class rubber band 20. reinforced with canvas made of polyamide (trade name: nylon). Second class rubber band 22. The third type rubber bands 24 are stacked in two layers with vertical positions shifted as shown in FIG. A plurality of pairs of reinforcing steel plates 26 are fixed along the vertical direction with bolts and nuts in the form of sandwiching wooden rubber plates.

The first type rubber band 20 has a strength of 3ooKg/ctn
(Tensile strength in the longitudinal direction per unit width) The second type rubber band 22 is reinforced with four pieces of polyamide canvas with a strength of 700 kg/α, and the second type rubber band 24 is reinforced with nine sheets of polyamide canvas having a strength of 700'i/cm, and therefore the strength (elastic modulus) distribution in the vertical direction of the rubber band 18 is as follows:
In FIG. 2, it can be represented as indicated by the arrow.

In addition, the rubber band 18 has its lower side connected to the river bed concrete 12.
It stands upright on the riverbed concrete 12 in contact with the riverbed concrete 12, but this expression "standing upright" means that the angle β with respect to the surface of the riverbed concrete 12 is less than 90 degrees (β<90) as shown in FIG.
This means that by tilting the rubber band 18 toward the downstream side, it becomes possible to prevent the rubber band 18 from floating up using water pressure.

Furthermore, locking metal fittings 28 each having a cross-sectional shape are closely attached to both ends of the rubber band 18. By locking in the locking groove 16 formed in the vertical direction on the outer surface of the
The rubber band 18 is fixed.

The present embodiment is constructed as described above, and the structure in which the rubber band 18 is locked to the supporting bodies 14 forming a pair is extremely simple, the construction cost is low, and the construction cost is low. It can be advantageously used as a water intake weir, etc.

As shown in Figure 2, the strength of the rubber band 18 gradually decreases from the bottom to the top, and due to a slight difference in elongation rate in the water depth direction (vertical direction), the strength of the rubber band 18 decreases in stages from the bottom to the top. If the strength distribution is set so that the inclination angle β of the rubber band 18 with respect to the surface is less than 90 degrees in use, the lower side of the rubber band 18 will be strongly pressed against the river bed concrete 12 by water pressure, and the reinforcement as a rigid member will be In conjunction with the action of the steel plate 26, the rubber band 18 can always be maintained in a stable upright position, and the rubber band 18
Shallow water can be effectively blocked between the riverbed concrete and river bed concrete]. Further, according to this structure, there is no need to attach a weight to the rubber band 18 to prevent it from floating up, and the rubber band 18 can be easily handled.

The strength distribution of the rubber band 18 is set so that the elongation rate of the rubber band 18 due to water pressure does not differ in the water depth direction, and by slightly inclining the locking groove 16 of the support body 14 toward the downstream side, the rubber band 18 is It is also possible to incline the band 18 itself at an angle β in advance.

FIG. 5 shows another embodiment of the flexible band
In the weir 30, one support 32 is provided with a winding device 36, and the other support 34 is provided with a pull-out device 38, and by operating the pull-out device 38, the wind-up is carried out via the lobe 42. Device! The rubber band 40 can be pulled out from the i36 and stretched between the supports 32 and 34, and the winding device @36 can be operated to wind up and store the rubber band 40. In this example as well, the strength of the rubber band 40 is set so that the lower part is larger than the upper part, and the inclination angle β with respect to the surface of the riverbed concrete 12 is less than 90 degrees in the used state. The changes will be made in stages.

FIG. 6 shows still another embodiment, in which a flexible band layer 50 has supports 58 attached at intervals to a rubber band 56 similar to the rubber band 18, and a riverbed concrete layer 58 on the upstream side.
Each pillar 58 is supported by three lobes 54 each tied to a plurality of planting pillars 52 provided in 2, and the pillars 58 are
The rubber band 56 is maintained in a vertical position with respect to the surface of the riverbed concrete 12, and the inclination angle β of the rubber band 56 with respect to the surface of the riverbed concrete 12 is less than 90 degrees as in the previous embodiment.

In this example, the lobes 54 are tied (
The flexible strap layer 50 can be assembled by simply locking or locking the loaf 54 and the loaf 54 can be removed from the planting struts 52 and the rubber strap 56 with struts 58 can be stored on land.

As is clear from the above explanation, the flexible band layer according to the present invention uses a flexible band whose lower part has a larger elastic modulus than its upper part. By supporting both ends of the body with a pair of supports, the flexible band was installed across the river, curving toward the downstream side and standing upright on the riverbed, resulting in an extremely simple structure. It is simple and easy to handle, has low construction costs, and can be advantageously used as a temporary cofferdam layer or as a main body layer.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a flexible band layer according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the I[-IF line, and FIG.
-m line sectional view, FIG. 4 is the same <IV-IV line sectional view, and FIGS. 5 and 6 are perspective views of flexible band weirs according to other embodiments, respectively. DESCRIPTION OF SYMBOLS 10... Flexible band layer, 12... Riverbed concrete, 14... Support body, 16... Locking groove, 18... Rubber band, 20... First class rubber band, 22... Second type rubber band, 24... Third type rubber band, 26... Reinforcement steel plate, 2
8... Locking metal fitting, 30... Flexible band weir, 32...
- Support body, 34... Support body, 36... Winding device,
38...Drawer device, 40...Rubber band, 42...
- Lobe, 50... Flexible band layer, 52... Planting strut, 54... Lobe, 56... Rubber band, 58...
Prop.

Claims (1)

[Scope of Claims] A flexible band that crosses a river while curving downstream and standing upright on the river bed is supported at both ends by a pair of supports, the flexible band being The flexible band weir is characterized in that the elastic modulus of the lower part of the elastic band is larger than that of the upper part.