JP2009275454A - U-shaped concrete block - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a U-shaped concrete block of high strength with side slabs erected on both sides of a bottom slab. <P>SOLUTION: A hole 5 is provided penetrating the bottom slab 2. The hole 5 is shaped to reduce its width dimension on the side slab side to enlarge the cross-sectional area of the bottom slab, and a hole inner peripheral surface 8 is slightly inclined. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a U-shaped concrete block that can be stably installed and has improved bottom plate strength without using a special reinforcing material.

  U-shaped concrete blocks are generally used as water channels and have a wide variety of uses. For example, they are used for drainage channels in paddy fields and side ditches of roads. Compared to the case where concrete is placed in a framed formwork to create a waterway, the concrete canal can be easily constructed by arranging concrete blocks shaped in a predetermined U shape. Many types of concrete blocks are used.

  For a long time, the channel has been an inverted trapezoidal shape with three sides of the side walls and the bottom made of earth and sand, but it is necessary to make the slope of the slope gentle to prevent the collapse of the side earth and sand. It becomes. As a result, the effective area of the land on the surface is reduced, and weeding work is necessary because weeds grow in large quantities in and around the waterway. Therefore, in recent years, by using the U-shaped concrete block, the direct construction cost including construction is low, and in addition to being excellent in productivity in factories and the like, the effective area of the land is increased, a reliable flow rate is ensured, Prevents weed growth.

  FIG. 5 shows the appearance of a general U-shaped concrete block. The U-shaped concrete block is composed of a bottom plate (I) and side plates (B) and (B) to form a U-shape. The U-shaped concrete blocks are arranged and installed on a flat foundation surface made of concrete, and concrete is placed on the bottom plate (a) to form the bottom surface of the water channel.

  FIG. 6 shows a cross section of the water channel when a U-shaped concrete block is installed. The U-shaped concrete block is placed on a flat foundation (c), and concrete is cast on the bottom to form the bottom surface (d) of the water channel, and the concrete (e) is provided on the bottom plate (b). The hole (f) is filled. Accordingly, the concrete (e) is integrated with the foundation (c), and the U-shaped concrete block is fixed to the foundation (c).

  A plurality of reinforcing bars (g) are embedded in the side plate (b) to ensure the strength of the side plate (b). However, when a large amount of water flows through the water channel and the water depth increases, the water pressure acts on the side plate (b) and a crack occurs at the side edge of the bottom plate (b). That is, by forming a hole (f) in the bottom plate (A), the strength of the side end region is weakened. On the other hand, when the U-shaped concrete block is buried in the ground, the side edge of the bottom plate is also weakened by the earth pressure acting on the outer surface of the side plate (b).

  Thus, the conventional U-shaped concrete block has the above-described problems. The problem to be solved by the present invention is this problem, and provides a U-shaped concrete block in which the side edge strength of the bottom plate is enhanced.

  The U-shaped concrete block according to the present invention includes a bottom plate and both side plates, and the side plate stands vertically on both sides of the bottom plate and has a U-shaped cross-sectional shape. The bottom plate is provided with a hole therethrough, and the shape of this hole is substantially rectangular, and the width dimension on both sides of the plate is small. Accordingly, the cross-sectional area on the side plate side of the bottom plate is increased and the bending strength is improved. Here, the length and height of the U-shaped concrete block (the length of the bottom plate and the side plate, the height of the bottom plate) are not limited.

  The number of roughly rectangular holes formed in the bottom plate is one or more, and half holes (half holes) are formed at the ends. That is, when U-shaped concrete blocks are arranged, they are combined with adjacent U-shaped concrete blocks to form a substantially rectangular hole. Furthermore, the inner peripheral surface of the hole is slightly inclined, and is inclined so that the approximate rectangle on the upper surface side becomes larger. Here, the specific shapes of the holes and the half holes are not limited, and any shape may be used as long as the width dimension on the side plate side is reduced. For example, it is possible to make it an approximately oval shape.

  The U-shaped concrete block of the present invention has a U-shape in which side plates are erected vertically on both sides of a bottom plate, and a water channel can be formed by arranging them on a concrete foundation. And, concrete is cast on the bottom plate of the U-shaped concrete block placed on the foundation to form a water channel bottom, but the bottom plate is provided with holes and half-holes, so that the concrete has no holes. And integrated with the foundation.

  Therefore, the U-shaped concrete block can be stably installed. On the other hand, the hole provided in the bottom plate is a substantially rectangular shape or a substantially oval shape extending in the both-side plate direction, but the width dimension is reduced on the side plate side, the cross-sectional area of the bottom plate is increased on the side plate side, and the bending strength is improved. To do. Therefore, the bottom plate is not cracked by the hydraulic pressure acting on the inside of the side plate or the earth pressure acting on the outside of the side plate. In the present invention, the bending strength of the bottom plate is improved by devising the shape of the through hole without embedding a special reinforcing material in the bottom plate.

  FIG. 1 is an embodiment showing the appearance of a U-shaped concrete block 1 according to the present invention. In the figure, reference numeral 2 denotes a bottom plate, 3 denotes a side plate, and the side plates 3 and 3 stand vertically on both sides of the bottom plate 2 and the shape thereof is U-shaped. Upper lid engaging grooves 4, 4 are continuously provided in the longitudinal direction at the upper ends of the side plates 3, 3, and both side ends of the upper lid (not shown) straddling the side plates 3, 3 are upper lid engaging grooves 4, 4 Is engaged and placed.

  The U-shaped concrete blocks 1 can be arranged and installed in the longitudinal direction to form a predetermined water channel. This is installed on a foundation made of concrete, and concrete is placed on the bottom plate 2 to form a water channel bottom. The U-shaped concrete block 1 in FIG. 1 is formed to form upper lid engaging grooves 4 and 4 so that the upper lid can be attached to the upper end of the side plate, and is used as a side groove for roads. In many cases, the upper lid is not attached. Therefore, when the upper lid is not attached, it is not necessary to form the upper lid engaging grooves 4 and 4 at the upper end of the side plate.

  By the way, a substantially rectangular hole 5 is formed in the bottom plate 2 so as to penetrate therethrough, and half holes 6 and 6 formed in combination with the bottom plate 2 of the adjacent U-shaped concrete block 1 when arranged at the end of the bottom plate. Provided. FIG. 2 is a plan view of the U-shaped concrete block 1. As shown in FIG. 2, the substantially rectangular hole 5 extends in the direction of the both side plates, and the width dimension M on the side plate side is small.

  For this reason, the cross-sectional area of the bottom plate 2 on the side plate side is enlarged, and the strength against bending at this portion is improved. Similarly, in the case of the half holes 6 and 6 formed at the end portion of the bottom plate 2, the width dimension M / 2 on the side plate side is reduced. By the way, the shape of the hole 5 is not limited to the case shown in the figure, and may be a shape whose width dimension is reduced on the side plate side. For example, an oval hole 5 may be used. In this case, the half hole 6 also has a semi-oval shape.

  FIG. 3 shows a longitudinal section of the U-shaped concrete block 1, and reinforcing bars 7 are embedded in the side plate 3 to enhance the strength of the side plate 3. Of course, the reinforcing bars 7, 7,... Are also embedded in the bottom plate 2. However, by providing the holes 5 and the half holes 6, 6, the number of the reinforcing bars 7, 7,. As a result, since the bending strength of the bottom plate 2 is lowered, in the present invention, a substantially rectangular hole or a substantially oval hole is provided to reinforce the strength on the side plate side.

  And the inner peripheral surface 8 of the hole 5 formed in the bottom plate 2 is slightly inclined, and the upper surface side of the substantially rectangular shape is large. Therefore, if the U-shaped concrete block 1 is placed on the foundation and placed on the cement and the bottom, the concrete is filled in the hole 5 and fixed and integrated with the foundation. Is fixed without rising.

  Similarly, the half hole 6 is filled and connected to the adjacent U-shaped concrete blocks 1, 1. Therefore, the U-shaped concrete blocks 1, 1... Are stably installed and are not displaced from the adjacent U-shaped concrete blocks 1, 1. And the connecting inserts 9, 9,... Are embedded in the upper outer surfaces of the side plates 3, 3,... And can be connected by a connecting plate (not shown).

  Further, fixing inserts 11, 11,... Are embedded in the groove bottoms 10, 10 of the upper cover engaging grooves 4, 4 formed at the upper ends of the both side plates 3, 3, and the upper cover 12 to be placed is used for the fixing. Screwed into the insert. FIG. 4 shows a case where the upper lids 12 and 12 are placed and attached to the upper end of the U-shaped concrete block 1.

The external view which shows the U-shaped concrete block concerning this invention. The top view of a U-shaped concrete block. The longitudinal cross-sectional view of a U-shaped concrete block. When an upper lid is placed on the upper end of a U-shaped concrete block. Conventional U-shaped concrete block. The longitudinal cross-sectional view at the time of installing a U-shaped concrete block.

Explanation of symbols

1 U-shaped concrete block 2 Bottom plate 3 Side plate 4 Upper lid engaging groove 5 Hole 6 Half hole 7 Reinforcing bar 8 Inner peripheral surface 9 Connecting insert
10 Groove bottom
11 Insert for fixing
12 Top cover

Claims (4)

In a U-shaped concrete block with side plates standing on both sides of the bottom plate, the bottom plate cross-sectional area is increased by penetrating a hole in the bottom plate, reducing the shape of the hole on the side plate side, and the inner circumference of the hole A U-shaped concrete block characterized in that the surface is slightly inclined. In a U-shaped concrete block with side plates standing on both sides of the bottom plate, the bottom plate cross-sectional area is increased by penetrating a hole in the bottom plate and reducing the width of the shape of the hole on the side plate side. A U-shaped concrete block provided with a half hole penetrating at the end, and the hole inner peripheral surface and the half hole inner peripheral surface are slightly inclined. The U-shaped concrete block according to claim 1 or 2, wherein the shape of the hole is a substantially rectangular shape extending in both side plate directions. The U-shaped concrete block according to claim 1, wherein the shape of the hole is a substantially oval shape extending in both side plate directions.

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