JPH0455073Y2 - - 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 specifically 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. 4A. "Sand drain pipe" (1987-)
(No. 64436) In addition, if the dam is not large enough to have a sand discharge pipe, wear and tear may occur due to the dynamic energy of the mixed sand and gravel flowing over the concrete downstream channel bed or, in some cases, the weir itself. It becomes necessary to protect the surface from

Conventional technologies proposed in response to this request include the ``weir protector'' (Figure 5A of Utility Model Application Publication No. 58-171920) and the ``river bed protector'' (Japanese Unexamined Patent Publication No. 61-186604).
A series of proposals can be found, such as the following:

[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 first cited prior art, what is shown as an example is a rectangular thin flat plate 1a as shown in FIG. 4B, in which several mounting bolt holes 6a are drilled in a metal plate. The feature is that a cone hole 13 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 and the binding force between the lining material and the foundation is lost, or even the lining material may float and flow out. Furthermore, if the bolt head is subjected to an impact by dirt or stones, the ridges on the bolt thread surface may break and the bolt may become difficult to remove when replacing the lining material.

Next, in the cited prior art, as shown in FIG. 5B, the lining material 1b consists of a rubber material 14 and a reinforcing steel plate 15,
It is connected to the mounting hole 6b. 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 problem] In the structure for attaching 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, and the four corners of each flat plate are
A notch with a step is provided in an arc shape with four circumferences, and a circular hole with a step is formed by a collection of the notches at the center point of four lining materials arranged in a square shape.
By inserting a cylindrical retainer with a flange into the mounting bolt hole drilled in the retainer plate and into the mounting seat by sinking the head of the mounting bolt deeply from the retainer plate surface and screwing it into the foundation. The above problems have been solved.

[Function] The function of the present invention will be explained based on FIG. 1 (plan view), FIG. 2 (plan view before screwing), and FIG. 3 (plane sectional view after screwing) showing an embodiment. .

The lining material 1 is a rectangular metal plate, and the four corners of this rectangle are provided with stepped notches in the shape of an arc of 1/4 circumference, so if the four lining materials are arranged in a square, the center A circular hole 3 with a step 2 is formed. A cylindrical retainer 5 with a matching flange 4 is fitted into the circular hole 3, and the head of the mounting bolt 8 is sunk deeply into the mounting bolt 6 and mounting seat 7 drilled in the center of the retainer 5. Adjust the length as shown and screw it into the mounting nut 9 fixed to 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 10. This prevents direct contact with earth and sand, resulting in a kind of self-lining effect.

[Example] 1 to 3 show embodiments 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. Further, since the retaining material 5 also falls under the same wear conditions as the lining material, it is preferable to select the same material. Alternatively, for economical reasons, it is conceivable to use ordinary steel (SS41) for the restraining material and replace the restraining material and mounting bolts at a shorter cycle than the lining material. Both have simple shapes, and if possible, the bolt holes 6 and mounting seats 7 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 addition, in FIG. 3, the mounting nut 9 is fixed in a predetermined position in advance, and this nut 9 and the lining material 1 are connected together.
The mounting bolt 8 inserted into the mounting bolt hole 6 is screwed together to fix the lining material. When the lining material has been arranged in a certain unit, cement mortar 12 is poured and filled between the lining material and the foundation concrete 11 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)
The minimum amount is enough.

Furthermore, in the present invention, the lining material itself is not attached with the mounting bolts, but is only indirectly pressed by the retaining material, so even if the area around the mounting bolt hole becomes abnormally eroded, only the retaining material can be replaced. Bye.

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 deeper than the thickness itself.

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 lifting means (such as a crane truck).

[Brief explanation of drawings]

Fig. 1 is a plan view of the embodiment of the present invention, Fig. 2 is a plan view before screwing, Fig. 3 is a front sectional view after screwing,
Figures 4A and B are an overall front sectional view and a plan view of the lining material showing an example of the prior art, and Figures 5A and B
FIG. 2 is 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... Step, 3... Circular hole, 4... Tsuba, 5... Holding material, 6... Mounting bolt hole, 7... Mounting seat, 8... Mounting bolt.

Claims (1)

[Scope of utility model registration request] This is a lining installed on the waterway floor surface and waterway side of the downstream waterway of a dam.The lining material is made of rectangular metal flat plates, and the four corners of each flat plate are cut with steps in the shape of an arc of 1/4 circumference. Create a gap,
A cylindrical retainer with a brim is inserted into a stepped circular hole formed by a collection of the notches at the center point of four pieces of lining material arranged in a square shape, and a mounting bolt hole is drilled in the retainer plate. and a mounting structure for lining material on the waterway floor and waterway side, characterized in that the head of the mounting bolt is sunk deeply from the surface of the holding plate into the mounting seat and is inserted and screwed into the foundation.