JPS597385Y2 - Connecting block for earth waterways - Google Patents

Description

[Detailed description of the invention] This invention relates to an improved shape of a connecting block for earth waterways.

In general, connecting blocks for waterways are used for riverbed protection, bank protection, etc. by laying concrete on riverbeds and surface slopes.

As shown in Fig. 1, the conventional connection block 1 for water supply channels has a shape of a flat quadrangular truncated pyramid with a height shorter than the length of the base, and is symmetrical front to back and left and right with respect to the water flow direction. It becomes.

As shown in FIG. 2, the system is used in such a way that a plurality of connecting blocks 1 for water canals are connected and laid on the river bed and slope with cement or the like.

By the way, the conventional flat earth canal connecting block mentioned above is
In the case of slopes, it is used to prevent riverbeds from lowering, to prevent turbulence, and to control the flow velocity.

However, from an economical point of view, for the bank protection of small and medium-sized rivers, it is not necessary to completely cover three sides of the connecting blocks for water canals up to the planned high water level.
It is not uncommon for water to stop up to a level where the probability of flooding is relatively high, or in localized areas such as curved areas or the bottom of slopes.

Therefore, if the water level is higher than the area where the earth canal connecting block is installed, the difference in roughness between the water canal and the water canal connecting block is large, so the area where the block part and the unclad block part are adjacent This may cause local turbulence, which could damage the non-covered block portion of the slope, which could even damage the connecting blocks for earth canals and cause the river to burst.

The purpose of this invention is to improve the roughness coefficient of the conventional flat water canal connecting blocks and the roughness of the earth canal itself during heavy rains, that is, when the water level is higher than the part of the slope where the earth canal block is installed. The purpose is to prevent the turbulence of flowing water that occurs locally due to large differences in the degree coefficients, thereby preventing damage to earth canals.

That is, this device consists of a flat approximately truncated pyramid shape with a rectangular base, and when the long side of the base of the connecting block for earth canals is placed parallel to the flowing water direction, the surface facing the flowing water and the The opposite sides are shaped to have different inclination angles with the bottom, and furthermore, holes for connecting iron wires are provided at predetermined positions on the bottom of this earth waterway connecting block. It is a summary.

This invention will be explained in more detail below with reference to the drawings.

FIG. 3A shows an example of this invention, and this earth channel connecting block 2 has a flat substantially truncated pyramid shape with a rectangular bottom. The angle of inclination of the inclined surface 24 with respect to the bottom surface of the block is smaller than the angle of inclination of the inclined surface 26 on the opposite side.

Furthermore, the periphery of the base 28 of this connecting block for earth canals is protruded so that the contact surface between the blocks becomes small in order to provide flexibility when the connecting blocks 2 for earth canals are connected. .

Further, this base portion 28 is provided with a connecting wire hole 22 shaped in a direction crossing the water flow direction W.

FIGS. 4A, B, and C show the state in which the connecting block 2 for earth canals of this invention is used, that is, the connection mode.

In FIG. 4A, the connecting blocks 2 for earth canals of this invention are arranged side by side so that the inclined surfaces 24 having a small angle of inclination with the block bottom face in the same direction.

In this case, both inclined surfaces 2 of the connection block 2 for water supply channel
4. 26 should be selected to face the water depending on the roughness of the earth channel.

Incidentally, the method of combining the earth canal blocks of this invention is not limited to the above case, and the slopes 24.
26 may be alternately arranged in parallel so as to face each other in the direction of water flow, or may be combined with the conventional connection block 1 for water supply channels as shown in FIG. 4C, and there are various ways of combining them.

By using the connecting blocks for earth canals in the form of this invention, block-lined earth canals can freely obtain roughness coefficients close to the roughness coefficient of the water canal itself by combining various connecting blocks for earth canals. became.

Therefore, even during heavy rain, that is, when the water level reaches the unclad block part of the slope, the roughness coefficients of the unclad block part and the block laying part are similar, so the unclad block part and the block laying part are similar. This eliminates the possibility of local turbulence occurring near adjacent areas of the river, and the risk of damage to the non-covered block portion of the slope, or even damage to the block-laying portion, which would cause the river to burst.

[Brief explanation of the drawing]

Figure 1 is a perspective view showing a conventional earth canal connecting block.
Figure 2 is a cross-sectional view of a river in which a connecting block for water canals has been installed, Figure 3 is a perspective view showing an example of the connecting block for earth canals of this invention, and Figures 4 A, B, and C are views of this invention. FIG. 3 is a partial plan view showing the state in which the connecting block for earth waterways is used. 2... Connecting block for earth waterways, 24.26...
...Block slope, 28...Block base, 22...Connection wire hole, W...Water flow direction, S...Soil.

Claims (2)

[Scope of utility model registration request] (1) A connecting block for earth canals consisting of a flat substantially truncated pyramid with a rectangular bottom, characterized in that the front and rear slopes 24 and 26 have different slope angles in the direction of water flow. . (2) The connecting block for earth canals according to claim 1, wherein the center of the periphery of the block base 28 is protruded and a hole 22 for conducting the connecting wire is provided at a predetermined position of the base.