JP2002180442A - Permeable sand control dam - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow the economical design of a dam body by buffering collision energy received by the dam body due to the collision of boulders in a flood, by a buffer means to reduce external force received by the dam body, and to allow the easy replacement of the damaged buffer means. SOLUTION: The buffer means 14 for absorbing the collision energy of boulders in a flood is provided at the upstream face of the dam body detachably from the dam body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission type sabo dam, and more particularly to a damping means for damping impact energy received by a dam body due to boulder impact during flooding, thereby reducing external force received by the dam body. The present invention relates to a permeation type sabo dam which enables an economic design of a dam body and easily replaces a damaged buffer means.

[0002]

2. Description of the Related Art Permeable sabo dams prevent large floods and debris flows, allow sediment to flow downstream during normal and medium and small floods, systematically secure the dam's empty capacity, and provide natural control. It has advantages that are not found in impermeable dams that do not allow earth and sand to flow down.

A typical transmission type sabo dam includes a lattice type steel sabo dam shown in a perspective view of FIG. 16, a slit type steel sabo dam shown in a perspective view of FIG. 17, and a perspective view of FIG. And a slit-type concrete sabo dam.

[0004] The lattice-type steel sabo dam has an opening which is partitioned in the vertical and horizontal directions, and the slit-type dam has an opening in the vertical direction. As an example of a steel transmission type sabo dam, a base concrete 1, a steel pipe column 2 fixed on the base concrete 1 (or on the ground), and a steel pipe beam 3 fixed between the columns 2 In the case of lattice-type steel sabo dams, steel pipe diagonal members 4
There is. The frame constituted by the column member 2 and the beam member 3 or the diagonal member 4 is connected to an adjacent frame by a steel pipe connecting beam member 5, and the ends of the members are flanged to each other. Note that the column material, the beam material, and the connecting beam material are not limited to steel pipes, but may be other steel materials, for example, shaped steel materials such as H-shaped steel.

In the above-described steel transmission type sabo dam,
The impact energy of boulders during a flood is absorbed as follows. (1) Converted to plastic dent deformation energy of steel pipe at bomb impact point. (2) Converted into plastic deformation energy as a beam of the member that the boulder collided with. (3) Converted to the plastic deformation energy of the dam body.

[0006]

When the function as a sabo dam is deteriorated due to the plastic deformation of the steel pipe member and the dam body due to the collision of the boulders during the flood, the damaged part is replaced with a new member. Or it was necessary to reinforce the damaged part. However, this task is very difficult and expensive.

Accordingly, an object of the present invention is to reduce the external force received by the dam body by damping the collision energy received by the dam body due to the collision of the boulders during a flood, thereby reducing the economical design of the dam body. It is an object of the present invention to provide a permeation type sabo dam which enables the damping means to be easily replaced.

[0008]

According to the first aspect of the present invention,
It is characterized in that a buffer means for absorbing collision energy of boulders during a flood is detachably attached to the dam body on the upstream surface of the dam body.

According to a second aspect of the present invention, the dam body includes:
It is characterized by comprising a steel column fixed on the foundation concrete or the ground, and a steel beam fixed between the columns.

[0010] According to a third aspect of the present invention, the buffer means includes:
It is characterized in that its horizontal cross section is made of a member having a closed cross section.

[0011] According to a fourth aspect of the present invention, the buffer means includes:
It is characterized by being made of a cylindrical steel pipe.

[0012] According to a fifth aspect of the present invention, the buffer means includes:
It is characterized by being made of a semi-cylindrical steel pipe.

According to a sixth aspect of the present invention, the buffering means includes:
It is characterized by being divided into a plurality of lines.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the transmission type sabo dam of the present invention will be described with reference to the drawings.

FIG. 1 is a side view showing a transmission type sabo dam of the present invention, FIG. 2 is a front view of the transmission type sabo dam of FIG. 1 viewed from an upstream side, and FIG. 3 is a transmission type sabo dam of the present invention. FIG. 4 is a cross-sectional view taken along the line AA of FIG. 1, FIG. 5 is a cross-sectional view showing another buffer means, and FIG. 6 is a cross-sectional view showing still another buffer means. 7, FIG. 7 is a sectional view showing the buffer means fixed to the column member by another method, FIG. 8 is a sectional view showing the buffer means fixed to the connecting element, and FIG. 9 is a sectional view showing the buffer means fixed to the connecting element. 10 is a partial side view, FIG. 10 is a sectional view showing the buffer means fixed to the coupling element by another method, FIG. 11 is a partial side view showing the buffer means fixed to the coupling element by another method, FIG.
Is a partial side view showing a transmission type sabo dam of the present invention provided with divided buffer means, FIG. 13 is a side view showing another transmission type sabo dam of the present invention, and FIG. FIG. 15 is a side view showing still another transmission type sabo dam of the present invention.

In FIG. 1 to FIG. 15, 1 is a foundation concrete, and 6 is a steel pipe column fixed on the foundation concrete 1. In addition, 6A shows an upstream column material. 7
Is a steel pipe beam member fixed between the column members 6. Beam 7
Is composed of a horizontal beam 7A, an inclined beam 7B, and a connecting beam 7C, each of which is made of a steel pipe. 8
Is a steel box-shaped connecting element for connecting the column member 6 and the beam member 7 to each other, and is filled with concrete 9 inside. 8A indicates an upstream binding element. The coupling element 8 is made of a polyhedral box-like member,
The connecting ends of the column member 6 and the beam member 7 are connected to each surface of the box-shaped member as follows.

The column member 6 and the beam member 7 (horizontal beam member 7)
A, the inclined beam member 7B, and the connecting beam member 7C) may be a section steel such as an H-section steel in addition to a steel pipe having a circular or square cross section.

The connecting ends of the column member 6 and the beam member 7 penetrate the wall surface of the box-shaped connecting element 8 and are buried in the concrete 9.
Are concentrated at one point (O) in the coupling element 8, as shown in FIGS. In addition, if the steel plate 10 is fixed to the outer surfaces of the ends of the column members 6 and the beam members 7, the framework can be easily constructed.

By concentrating the axis (l) of each of the column member 6 and the beam member 7 at one point (O) in the box-shaped coupling element 8, the transmission of force becomes clear and simple. Thus, a reasonable and economical dam design is possible. In addition, since no flange connection is used for connecting the connecting element 8 to the column member 6 and the beam member 7, the production of the frame and the installation of the frame are facilitated.

As shown in FIG. 1, the connecting element 8 at the top may be structured so that the axes do not always coincide with each other in terms of economy. Of course, the axes may be aligned as indicated by the two-dot chain line in the figure.

As shown in FIG. 3, the connecting element 8
Each of the connecting element 8, the column member 6, and the beam member 7 may be formed by a flange member 11, a web member 12, and a reinforcing member 13 made of a steel plate.

Reference numeral 14 denotes a buffering means which is detachably attached to the front surface of the pillar 6A on the upstream side of the dam body by bolts 16 via brackets 15. When boulders collide with the buffer means 14, the buffer means 14 is dented and deformed. Thereby, the collision energy is absorbed, and the plastic deformation of the dam body is prevented or reduced.

The buffer means 14 is made of a cylindrical steel pipe as shown in FIG. 4 or a semi-tubular steel pipe as shown in FIG. 5, but other than this shape, for example, a square tubular steel pipe or the like. May be. Further, a split structure may be used. That is, the horizontal cross-sectional shape may be a closed cross section. In addition, this includes the case where it is attached to the column member 6A, and as a result, the combination results in a closed cross section. As shown in FIG. 6, a plurality of buffer means 14 may be attached to one pillar 6A. Further, as shown in FIG. 7, the buffer means 14 may be attached to the pillar 6A via an elastic buffer 17 such as rubber. In this case, the elastic cushioning member 17 is sandwiched between the brackets 15.

As shown in FIGS. 8 and 9, the buffer means 14 can be detachably attached to the upstream coupling element 8A via a bracket 15 with a bolt 16 in addition to the column member 6A as described above. May be attached. When the buffer means 14 is attached to the coupling element 8A, the transmission and dispersion of the collision energy can be performed more smoothly. Also in this case, as shown in FIGS. 10 and 11, an elastic cushioning material 17 such as rubber may be interposed between the bracket 15 and the coupling element 8A.

Further, the buffer means 14 may be divided into a plurality of pieces as shown in FIG. Dividing the buffer means 14 into a plurality of parts has the following advantages. That is, the buffer means 1
If 4 is one, even if the buffer means 14 is partially damaged, it is necessary to replace one buffer means with a completely new one, which is wasteful. In addition, only the damaged buffer means can be replaced, which is economical.

The above is a lattice-type steel sabo dam in which the buffer means 14 is attached to the dam body having a structure in which the axis of the column member 6 and the beam member 7 are concentrated at one point in the coupling element 8. As shown, the buffer means 14 may be attached to the conventional lattice-type steel sabo dam body of FIG. 16 in which the axis of the column member 6 and the beam member 7 are not concentrated at one point. Further, as shown in FIG. 14, the buffer means 14 may be attached to the slit-type steel sabo dam body of FIG. 17, and as shown in FIG.
Buffer means 14 on the slit type concrete sabo dam body
May be attached.

In any case, when boulders collide with the buffer means 14, the buffer means 14 is dented and deformed. Thereby, the collision energy is absorbed, and the plastic deformation of the dam body is prevented or reduced. Damaged buffer means 14 may include bolt 1
6 can be easily replaced with a new one by loosening.

[0028]

As described above, according to the present invention, a buffer means for absorbing the collision energy of boulders during a flood is detachably mounted on the upstream surface of the dam body with respect to the dam body. The impact energy received by the dam body due to the boulder collision during the flood is buffered by the damping means to reduce the external force applied to the dam body, thus enabling the economical design of the dam body, and furthermore, the damped damping means Useful effects such as easy replacement are provided.

[Brief description of the drawings]

FIG. 1 is a side view showing a transmission type sabo dam of the present invention.

FIG. 2 is a front view of the transmission type sabo dam of FIG. 1 as viewed from an upstream side.

FIG. 3 is a sectional view showing another connecting element of the transmission type sabo dam of the present invention.

FIG. 4 is a sectional view taken along line AA of FIG. 1;

FIG. 5 is a sectional view showing another buffer means.

FIG. 6 is a sectional view showing still another buffer means.

FIG. 7 is a cross-sectional view showing a buffering means fixed to a pillar by another method.

FIG. 8 is a sectional view showing the buffer means fixed to the coupling element.

FIG. 9 is a partial side view showing the buffer means fixed to the coupling element.

FIG. 10 is a cross-sectional view showing the buffer means fixed to the coupling element by another method.

FIG. 11 is a partial side view showing the buffer means fixed to the coupling element by another method.

FIG. 12 is a partial side view showing the transmission type sabo dam of the present invention provided with divided buffer means.

FIG. 13 is a side view showing another transmission type sabo dam of the present invention.

FIG. 14 is a perspective view showing still another transmission type sabo dam of the present invention.

FIG. 15 is a side view showing still another transmission type sabo dam of the present invention.

FIG. 16 is a perspective view showing a lattice-type steel sabo dam.

FIG. 17 is a perspective view showing a slit type steel sabo dam.

FIG. 18 is a perspective view showing a slit-type concrete sabo dam.

[Explanation of symbols]

 1: Basic concrete 2: Column material 3: Beam material 4: Diagonal material 5: Connecting beam material 6: Column material 6A: Upstream beam material 7: Beam material 7A: Horizontal beam material 7B: Inclined beam material 7C: Connecting beam material 8: Connecting element 8A: Upstream connecting element 9: Concrete 10: Steel plate 11: Flange material 12: Web material 13: Reinforcement material 14: Buffer means 15: Bracket 16: Bolt 17: Elastic buffer material

Claims (6)

[Claims] 1. A transmission type sabo dam, wherein a buffer means for absorbing collision energy of boulders during a flood is detachably attached to an upstream surface of the dam body with respect to the dam body. 2. The dam body according to claim 1, wherein the dam body comprises a steel column fixed on a foundation concrete or a ground, and a steel beam fixed between the columns.
The transparent sabo dam described. 3. The transmission type sabo dam according to claim 1, wherein said buffer means is made of a member having a closed cross section in a horizontal cross section. 4. The transmission type sabo dam according to claim 1, wherein said buffer means comprises a cylindrical steel pipe. 5. The transmission type sabo dam according to claim 1, wherein said buffer means is made of a semi-cylindrical steel pipe. 6. The apparatus according to claim 1, wherein said buffer means is divided into a plurality of pieces.
The transmission type sabo dam described above.