JPH057303Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The invention of the present application is a new technology relating to linings laid on the concrete surface of the waterway bed and the side surface of the waterway on the downstream side of a dam.

[Prior Art] Large-scale dams have a structure in which a sand discharge pipe that communicates between the upstream side and the downstream side is particularly provided to discharge the sediment deposited in the reservoir to the downstream side. In such cases, a technique has already been proposed in which a lining material is attached to part or all of the inner surface of the lining steel plate, as shown in FIG. 3A. "Sand drain pipe" (1987-)
(No. 64436) In addition, if the dam is not large enough to install sand drain pipes, the concrete downstream waterway bed or, in some cases, the dam itself may be damaged by wear and tear caused by the dynamic energy of mixed sand and gravel water that has overflowed into the dam itself. It becomes necessary to protect the surface.

Conventional techniques proposed in response to this demand include the "Dike Protector" (Japanese Utility Model Application Publication No. 58-171920, Figure 4A) and the "Riverbed Protector" (Japanese Patent Application Publication No. 61-186604,
A series of proposals can be found in the publications such as:

[Problems to be solved by the invention] If the lining material (metal wear-resistant material) itself, which is already known for large-scale sand discharge pipes, becomes worn over time, it will naturally need to be replaced. In the prior art cited at the beginning, what is shown as an embodiment is a rectangular thin flat plate 1a as shown in FIG. 3B, in which several mounting bolt holes 4a are drilled in a metal plate. The feature is that a cone hole 11 is provided for detecting the amount of wear, and the progress of wear can be determined by the size of the hole, but as a member that faces wear, there are still problems.

That is, when a mounting bolt is inserted into a flat plate and tightened with a nut below, the head of the mounting bolt protrudes from the surface of the flat plate, and is subjected to the most intensive wear due to the passage of earth and sand. As a result, the bolt head quickly disappears, the binding force between the lining material and the foundation is lost, and even the lining material may float and flow out. If the bolt head is subjected to an impact by dirt or stones, the threaded surface of the bolt may break, causing problems such as the bolt becoming unable to be removed when replacing the lining material.

Furthermore, in the conventional technology cited below, as shown in FIG.
b, and the mounting hole 4b. It is hard to deny that this method involves problems similar to those of the prior art cited above, except that the material is rubber. Although it has the advantage of being applicable to uneven foundations by utilizing the flexibility and elastic deformation of rubber, it cannot help but think that there are still problems with wear itself.

In order to solve the above problems, the present invention prevents a significant shortening of the service life due to early wear of the mounting bolt head, can withstand long-term use, and is easy to replace after the service life has been exceeded. The purpose is to provide a mounting structure for metal lining materials.

[Means for Solving the Problems] In the mounting structure of the lining material on the waterway bed and waterway side surface according to the present invention, the lining material is made of a rectangular metal plate shape, and a cross section is formed at the corners of two opposing sides of the rectangle. An L-shaped groove is provided, and a holding plate with a T-shaped cross section is fitted into the groove of each of the two adjacent lining materials, and the head of the mounting bolt is inserted into the mounting bolt hole drilled in the holding plate and into the mounting seat. The above-mentioned problem was solved by holding down the part and sinking it deeply from the surface of the board, inserting it and screwing it into the foundation.

[Operation] The operation of the present invention will be explained based on FIG. 1 (perspective view) and FIG. 2 (front sectional view) showing an embodiment.

The lining material 1 is a rectangular metal plate-like body, and grooves 2, 2 having an L-shaped cross section are provided at the corners of two opposing sides of the rectangle. The restraining plate 3, which is commonly fitted into this groove, is an elongated member having a T-shaped cross section as shown in the figure, and has the required number of mounting bolt holes 4 and bolt mounting seats 5 drilled therein. The length of the mounting bolt 6 is adjusted so that the head of the bolt 6 is sunk deeper than the surface of the restraining plate, and the bolt 6 is screwed into the foundation.

When actually facing overflowing earth and sand in such a state, the head of the mounting bolt does not show its face at all on the falling surface of the earth and sand, but rather the difference in level between the surface of the thick part and the head of the mounting bolt. Relatively fine earth and sand enters and accumulates in the space to form the earth and sand layer 7. This prevents direct contact with earth and sand, resulting in a kind of self-lining effect.

[Example] Fig. 1 (perspective view) and Fig. 2 (front sectional view) show an example of the present application.

The material of this lining material 1 may be selected depending on the amount and condition of the earth and sand passing on the channel bed and the channel side, but most preferably, for example, 27% Cr cast iron, 12% Mn cast steel, etc. Furthermore, since the restraining plate 3 is subjected to the same wear conditions as the lining material, it is preferable to select the same material. Alternatively, for economic reasons, it may be possible to replace only the restraining plate with SS41 (ordinary steel material) and replacing the restraining plate and mounting bolts at a shorter cycle than the lining material. Both have simple shapes, and if possible, the bolt holes 4 and mounting seats 5 to be drilled in the holding plate should be cast by casting to avoid machining of difficult-to-cut materials (almost all wear-resistant materials are difficult to machine).

In this example, the long restraining plate 3 is three times the length of one side of the lining material, and when fitted between the lining materials, it is screwed to the foundation with one mounting bolt per side length of the lining material. The position of the mounting hole was set as follows.

As an example of dimensions, for a square lining material with a length of 40 cm, the grooves provided at the corners are 2.5 cm deep.
The width should be 1.5cm. On the other hand, an example of a holding board is 1m20cm long, 6cm wide, and 2.5cm high and wide on the left and right sides of the top.
The 1.5cm convex part is evenly protruded. With this size example, the unit weight of the liner hanging material is approximately 40Kg, and the unit weight of the holding plate is approximately 30Kg.

In addition, in FIG. 2, the mounting nut 8 is fixed in a predetermined position in advance, and this nut 8 and the lining material 1 are connected together.
The mounting bolt 6 inserted into the mounting bolt hole 4 of is screwed together to fix the lining material. When the lining material has been arranged in a certain unit, cement mortar 9 is poured and filled between the lining material and the foundation concrete 10 that has been constructed on the surface of the canal floor and the sides of the canal, thereby stabilizing the lining material on the surface of the canal bed and the sides of the canal. adhere to the surface.

[Effects of the invention] Since the invention of the present application has the structure and operation described above, it can be used for a long period of time without causing troubles such as wear of the mounting bolts of the lining material or loss of binding force. Further, in this embodiment, the number of mounting bolts is reduced to one for each lining material, which greatly improves the advantage against wear. In addition, it is easy to install and replace, which is advantageous in terms of process, and auxiliary materials (mounting bolts)
is also minimal.

Furthermore, in the present invention, the lining material itself is not attached with mounting bolts, but is only indirectly pressed by the retaining plate, so even if the area around the mounting bolt hole becomes abnormally eroded, only the retaining plate can be replaced. That's fine. Furthermore, the advantage of this structure is that there is no restriction on the thickness of the lining material used to sink the head of the mounting bolt deeply; It is also possible to sink the head of the mounting bolt even deeper.

Further, as an advantage specific to the embodiment, if the dimensions are set to the extent shown above, the installation or replacement can be easily carried out by a worker by hand without the need for any particular hanging means (such as a crane truck).

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an embodiment of the present invention, FIG. 2 is a front sectional view, FIGS. 3 A and B are an overall front sectional view and a plan view of the lining material showing an embodiment of the prior art, and FIG. Figures A and B are an overall front sectional view and a front sectional view of a lining material showing another example of the prior art. 1... Lining material, 2... Concave groove, 3... Holding plate, 4... Mounting bolt hole, 5... Mounting seat.

Claims (1)

[Scope of utility model registration request] A lining installed on the waterway floor surface and waterway side of the downstream waterway of a dam, the lining material is made of a rectangular metal flat plate, and the lining material is made of a rectangular metal flat plate,
A concave groove having an L-shaped cross section is provided at the corner of the side, a retaining plate having a T-shaped cross section is inserted into the concave groove of each of the two adjacent lining materials, and a mounting bolt hole and a mounting seat are drilled in the retaining plate. A structure for attaching lining material to the waterway floor and waterway side, characterized by inserting the head of the mounting bolt inward and sinking it deeply from the surface of the board, and screwing it into the foundation.