JPH0332616Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a drop block for adjusting the excess head when designing a waterway to ensure the safety of the waterway.

If an excessive head still occurs even after proper slope distribution and route selection in the design of a canal system in a field, adjusting this head will ensure the safety of the canal and improve the overall canal system. A drop structure is installed in a waterway in order to perform various functions.In recent years, as farm fields have expanded from flatlands to mountainous areas, the need for drop structures has increased, and there are many creative ideas related to this. They can be divided into three types: large type, upright type, diagonal type, and still water tank type.

The upright type uses a vertical pipe or basin, and has a simple structure, light weight, and is widely used, but it is difficult to remove the sediment that accumulates at the bottom. There is a drawback. In addition, the diagonal type has the disadvantage that the speed of the water flow increases because it is formed by an inclined part, and the water scatters and scatters at the falling point, collapsing the surrounding ridge slope. Furthermore, the still water tank type requires a large still water pond to serve as a water cushion, which results in a large tank structure, which is not only inefficient but also expensive.

The drop structure of the present invention is located between an upright type and a still water tank type by using a drop block formed in a gate shape and forming a bottom plate at the open bottom of this block. We provide a drop block that has a structure that prevents the splashing of falling water from scattering, is easy to remove settled earth and sand that accumulates inside the drop from the downstream side, is easy to clean, and has sufficient strength because it has beams made of precast products. It is something to do.

To explain the drop structure block of the present invention with reference to the accompanying drawings, FIG. 1 is a side view of a gate-shaped block constituting the drop structure of the present invention, and FIG. 2 is a plan view of the block shown in FIG. 1. . Reference numerals 1 and 1 denote left and right side walls, which have a flat rectangular shape and are vertically opposed to each other, and reinforcing beams 2, 2 are wide and integrated at the front and rear upper ends of both side walls 1, 1. It is molded to form part of the top plate, and both end faces of this block are formed into a gate shape. Reference numeral 3 denotes an opening formed in the center of the top plate surface, into which a lid 6 is fitted as necessary to form a planar top plate. Reference numeral 7 denotes a baffle plate, which is integrally formed in an L-shape on the lower surface of the lid 6 and reduces the force of water flowing down from upstream.

A is the frium on the upstream side, and B is the frium on the downstream side. Naturally, the frium A on the upstream side is in contact with the top surface of the gate-shaped block, and the frium B on the downstream side is in contact with the bottom surface of the gate-shaped block. It is in contact with and forms a head l.

Reference numeral 4 denotes an earth retaining plate attached to the lower surface of the upstream frium A to prevent soil from entering. Referring to FIGS. 3 and 4, the upper surface of the downstream frium B is hollow, making it convenient to discharge and clean the settled earth and sand accumulated at the bottom of the drop block.

Figures 5 and 6 show examples of a drop using the drop block of the present invention, and there is a bottom plate 8 at the open bottom of the gate-shaped block, and this bottom plate 8 is as shown in Figure 5. In some cases, cast-in-place concrete may be used, or as shown in FIG. 6, a precast concrete plate 8' may be used, and 9 in the figure is a weir mountain to reduce the force of the water flow. Further, K is a still water reservoir that constitutes the cushion section.

The drop block of the present invention has the above-mentioned configuration, in particular, the side wall plates 1, 1 are rectangular flat plates facing each other and vertically formed, and reinforcing beams are installed at both the front and rear upper ends of the side walls 1, 1. 2 and 2 are provided wide and large and integrally molded to form a part of the top plate, and both end faces are gate-shaped, so when a large head l is required, that is, the height of the block is high. In addition, it is possible to not only prevent the splashing of water droplets, but also to attach the lid body 6 to the opening 3 of the top plate to prevent danger in case of heavy splashing. The drop using the gate-shaped block of the present invention has a large hollow section 5 on the downstream side, so it is convenient for draining and cleaning the settled earth and sand accumulated in the block, and can be used extremely effectively for managing the waterway structure.

[Brief explanation of the drawing]

FIG. 1 shows a side view of the drop block of the present invention, and FIG. 2 shows a plan view thereof. FIG. 3 shows a block diagram from the upstream side, FIG. 4 shows a block diagram from the downstream side, and FIGS. 5 and 6 show examples of drop construction. 1... Side plate, 2... Beam, 3... Top plate opening, 4
... Earth retaining board, 5... Hollow part, 6... Lid, 7... Baffle plate, 8... Bottom plate.

Claims (1)

[Claims for Utility Model Registration] 1. A top plate with flat left and right side walls 1, 1 facing each other perpendicularly, and reinforcing beams 2, 2 integrally provided at the front and back upper ends of both side walls 1, 1. forming part of
The center of the top plate surface excluding the beams 2 and 2 is made into an open shape 3, and drainage friums A and B are connected above and below the front and back of the end gate-shaped space formed by the left and right side walls to create a head l. A precast drop block characterized in that a retaining plate 4 is provided on the lower surface of an upstream frium A, and the upper surface of the downstream frium B is open-shaped 5. 2. The drop block according to claim 1, which has been registered as a utility model, in which the top plate surface is formed by fitting the lid body 6 into the open shape 3 at the center of the top plate surface. 3. A drop block according to claim 1, which is registered as a utility model and uses a lid 6 having an L-shaped cross section by integrally molding a baffle plate 7 on the lower surface of the lid 6 forming a top plate surface.