JPH0566444B2 - - Google Patents

Description

[Detailed description of the invention] Industrial applications The present invention relates to a temporary cofferdam construction method for a weir.

BACKGROUND OF THE INVENTION Normally, weirs are provided with water gates to adjust the amount of water, and temporary coffer gates (also referred to as backup gates) are provided to perform maintenance and inspection of the main gates that make up the water gates. Conventionally, such temporary closing gates include those shown in FIGS. 3 to 5. The temporary coffer gates 21 and 31 shown in FIGS. 3 and 4 are constructed by being divided into a plurality of upper and lower parts, and are installed in the door grooves formed in each pier 22 and 32 along the length along the span direction. Shaku division body 21
A, 31a are dropped in order, intermediate door stop 23,
33 and weir slab 24, 34 management bridge 25, 35
It is supported by The temporary coffer gate 41 shown in FIG. 5 is constituted by a floating body (also referred to as a floating gate), and is towed and fixed between piers 42 and 42 by a tugboat when in use.

Problems to be solved by the invention Temporary coffer gate 21 shown in FIGS. 3 and 4 above,
According to No. 31, it is necessary to provide a door groove in each pier 22, 32 and to provide an intermediate door stop 23, 33, and it is time-consuming to drop the long divided bodies 21a, 31a in order. There were problems such as the need to bury supporting hardware for supporting the bodies 21a, 31a in the weir floor slabs 24, 34 and the management bridges 25, 35. Further, according to the temporary coffer gate 41 shown in FIG. 5, no special equipment is required for the weir, but a space for storing the floating body or for pulling it up is required.
There were also other problems, such as the need for a tugboat for installation. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a weir temporary cofferdam construction method that can solve the above-mentioned problems.

Means for Solving the Problems In order to solve the above problems, the weir temporary cofferdam construction method of the present invention involves stretching a plurality of cables across the entire width of the weir at predetermined intervals in the vertical direction, and then This is a construction method in which a plurality of vertical support beams are attached to these cables, and then a waterproof sheet is attached to the upstream front surfaces of these support beams to temporarily close the weir.

Function According to the above temporary coffering method, temporary coffering can be performed by simply stretching the cable on the upstream side of the weir and attaching a water-stop sheet to the cable via the support beam, so it is not necessary to use the conventional cofferdam method. There is no need to provide door grooves, support fittings, etc., and there is no need to use tugboats or the like for installation.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. 1 is a water gate installed, for example, at an estuary weir, and has a plurality of piers 2 and these piers 2, 2.
It is composed of a plurality of main gates 3 arranged in between. And this water gate 1 has main gate 3.
For maintenance and inspection purposes, a temporary closing device 4 is provided to shut off the waterway of any main gate 3. This temporary coffering device 4 includes a plurality of winches 6 installed on the embankment bodies 5 on both sides of the waterway, and is wound around these winches 6 and covers the entire width of the weir, that is, both embankment bodies 5.
5 canes, and multiple canes above and below (for example, 4 canes)
A rope body 7 that can be stretched, a plurality of support beams 8 that can be attached and detached from the upstream front surfaces of these rope bodies 7, and a stop that can be attached and detached from the upstream front surfaces of these support beams 8. It is composed of a water sheet 9 and a plurality of guiding pulleys 10 for the cables 7 provided on the front surface of both piers 2 on the bank body 5 side.

Next, we will explain the temporary cofferdam construction method for maintenance and inspection of the main gate. For example, in FIGS. 1 and 2, when closing off the waterway at the second main gate 3A from the left, the winches 6 on both sides are operated to stretch multiple ropes 7 vertically across the entire width of the weir. do. Next, the piers 2, 2 on both sides of the main gate 3A
A plurality of support beams 8 are vertically attached at predetermined intervals to the front surface of each cable body 7 using fixing fittings (not shown). Next, a water stop sheet 9 is placed on the front surface of these support beams 8 to block the waterway between the predetermined piers 2 . If the main gate 3 is raised in this state, the water will be stopped by the water stop sheet 9. The water pressure applied to the water stop sheet 9 is supported by the pier 2 and the winch via the cable 7, and the tension of the cable 7 is adjusted by the winch 6. Since the water pressure is thus supported through the cables 7, there is little negative effect on the pier or weir compared to the case where it is supported by the doorway and intermediate doorstop.

Once the maintenance and inspection of the main gate is completed,
After lowering the main gate 3A, the water-stopping sheet 9, support beam 8, and cable body 7 may be removed by the reverse procedure to the above.

Incidentally, in the above embodiment, a plurality of support beams 8 are provided at predetermined intervals, but they may be provided close together, for example, so that adjacent ones are in contact with each other.

Effects of the Invention According to the above temporary cofferdam construction method of the present invention, a rope is stretched in front of a weir and a water-stop sheet is attached to this rope via a support beam. There is no need to form a bridge or install an intermediate door stop, there is no need to bury support hardware for the long divided body, and there is also no need for storage docks and tugboats unlike with floating bodies.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the present invention, FIG. 1 is an overall front view, FIG. 2 is a plan view of the same, and FIGS. 3 to 5 are sectional views of a conventional example. . 4... Temporary coffering device, 5... Embankment body, 6... Winch, 7... Cable body, 8... Support beam, 9... Water stop sheet.

Claims (1)

[Claims] 1. A plurality of cables are strung across the entire width of the weir at predetermined intervals in the vertical direction, and then a plurality of vertical support beams are attached to these cables. A temporary cofferdam construction method for a weir, which is characterized by installing a water sheet and temporarily closing the weir.