JP2001234524A - Permeable type checkdam - Google Patents

Abstract

PROBLEM TO BE SOLVED: To economically design a dam body, and to easily exchange damaged first and second cushioning means because collision energy received by the dam body by a collision with a front on the upstream side of the dam body of boulders in the case of a flood is cushioned by the first cushioning means, external force received by the dam body is reduced, and external force received by the dam body by the collision of the boulders passed through the first cushioning means or crossed over the dam body is lightened by installing the second cushioning means at the rear section of the dam body. SOLUTION: In the permeable type checkdam in which the first cushioning means 14 for absorbing the collision energy of the boulders in the case of the flood is mounted detachably on the uppermost stream-side post material 7A of the dam body, the second cushioning means 16 for absorbing the collision energy of the boulders passed through the first cushioning means or crossed over the dam body in the case of the flood is set up detachably to the upper section of the beam material of the dame 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 dam for damping a collision energy received by a dam body due to a boulder colliding with an upstream front surface of the dam body at the time of flooding. By reducing the external force received by the main body and further providing a second buffer means at the rear of the dam main body, the collision of the boulders that passed through the first buffer means and the collision of the boulders that passed over the dam main body caused the collision. The present invention relates to a permeation type sabo dam capable of reducing the external force applied to the dam body, thus making it possible to economically design the dam body and easily replacing the damaged first and second damping 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. 6, a slit type steel sabo dam shown in a perspective view of FIG. 7, 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.

[0005] In Figs. 6 to 8, 1 is a foundation concrete, and 2 is on a foundation concrete 1 (or on the ground).
The column member 3 made of steel pipe fixed to the column 3 is a beam member made of steel tube fixed between the column members 2. In the case of a lattice-type steel sabo dam, there is a diagonal member 4 made of steel pipe. 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. Converted to plastic dent deformation energy of steel pipe at bomb impact point. Converted into plastic deformation energy as a beam of the member that the boulder collided with. Converted to the plastic deformation energy of the dam body.

However, according to the above dam, when the function as a sabo dam is deteriorated due to plastic deformation of the steel pipe member and the dam body due to the boulder collision during the flood, the damaged portion is replaced with a new member. It was necessary to replace or reinforce the damaged part. However, this work includes:
It is very difficult and expensive.

The invention of the present application is disclosed in Japanese Patent Application Laid-Open No. 11-32.
As disclosed in Japanese Patent No. 3883, a transmission type sabo dam in which a damping means is attached to a dam body has been proposed, and a great effect has been achieved. Hereinafter, this dam is referred to as a conventional dam and will be described with reference to the drawings.

FIG. 3 is a side view showing a conventional dam, and FIG.
FIG. 5 is a front view of the conventional dam of FIG. 3 as viewed from the upstream side, and FIG. 5 is a cross-sectional view illustrating another connecting element of the conventional dam.

3 to 5, reference numeral 6 denotes a foundation concrete, reference numeral 7 denotes a steel pipe column member fixed on the foundation concrete 1, and reference numeral 7A denotes a most upstream column member. Reference numeral 8 denotes a steel pipe beam member fixed between the column members 7. The beam member 8 includes a horizontal beam member 8A and an inclined beam member 8 each formed of a steel pipe.
B and a connecting beam 8C. Reference numeral 9 denotes a steel box-shaped connecting element for connecting the column member 7 and the beam member 8 to each other, and the inside thereof is filled with concrete.
9A indicates an upstream binding element. The connecting element 9 is formed of a polyhedral box-shaped member, and the connecting ends of the column member 7 and the beam member 8 are connected to each surface of the box-shaped member as follows.

As shown in FIGS. 3 and 4, the connecting ends of the column member 7 and the beam member 8 penetrate the wall surface of the box-like connecting element 9 and are buried in the concrete 10;
And the axis (l) of each of the beam members 8 is
One point (O). Note that the uppermost connecting element is not concentrated at one point for economic reasons, but may be concentrated at one point like other coupling elements.

By concentrating the axis (l) of each of the column members 7 and the beam members 8 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 the flange element is not used for connecting the connecting element 9 to the column member 7 and the beam member 8, it is easy to manufacture the frame and to install the actual frame.

As shown in FIG. 5, the connecting element 9
Each of them may be constituted by a flange member 11 made of a steel plate, a web member 12, and a reinforcing member 13, and the coupling element 9, the column member 7, and the beam member 8 may be flange-coupled.

Numeral 14 designates a buffer means which is detachably attached to the front surface of the column member 7A on the most upstream side of the dam body via a bracket 15 by bolts. When the boulder collides 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 or a semi-cylindrical steel pipe. However, the buffer means 14 may have a shape other than this shape, for example, a square tubular steel pipe, or may have a divided structure. That is, the horizontal cross-sectional shape may be a closed cross section.
Further, a plurality of buffer means 14 may be attached to one pillar 7A, or the buffer means 14 may be attached to pillar 7A via an elastic buffer such as rubber.

According to the above-mentioned conventional dam, the buffer means 14 for absorbing the collision energy of the boulders during the flood is detachably attached to the dam main body on the upstream front side of the dam main body so that it can be detached from the dam main body. The collision energy received by the dam body due to the boulder collision is buffered by the buffer means 14, so that the external force received by the dam body can be reduced. As a result, it is possible to economically design the dam main body, and to obtain a useful effect that the damaged buffer means 14 can be easily replaced.

[0017]

However, the above-mentioned conventional dam has the following problems. That is, the collision energy of the boulders at the time of the flood can be absorbed, whereby the external force applied to the dam body can be reduced and the damage to the upstream beam 7A can be reduced.
It was not possible to absorb the collision energy due to the boulders that passed through and the boulders falling over the beams 8 (horizontal beams 8A, inclined beams 8B, and connecting beams 8C) after climbing over the dam body.

Accordingly, an object of the present invention is to provide a damping mechanism for damping the collision energy received by the dam body due to the collision of boulders against the upstream front surface of the dam body during a flood, and to reduce the external force received by the dam body. In addition, by providing the second buffer means at the rear part of the dam body, the collision force of the boulder that has passed through the first buffer means and the external force received by the dam body due to the collision of the boulder that has passed over the dam body Accordingly, it is an object of the present invention to provide a permeation type sabo dam which enables economical design of the dam body and facilitates replacement of the damaged first and second damping means.

[0019]

According to the first aspect of the present invention,
In a transmission type sabo dam in which first buffer means for absorbing collision energy of boulders during a flood is attached to the upstream front surface of the dam body, at the rear of the dam body, at the time of the flood, the first buffer means is provided. The present invention is characterized in that a second buffer means for absorbing the collision energy of the boulders that have slipped through and the boulders that have passed over the dam body is attached.

According to a second aspect of the present invention, the dam body includes:
A column material fixed on the foundation concrete or ground,
And a beam material fixed between the columns.

According to a third aspect of the present invention, the dam body includes:
Base concrete, a steel pipe column material fixed on the basic concrete, and a steel pipe beam material fixed between the column materials, the column material and the beam material are connected via a steel coupling element. They are connected to each other and are characterized in that the axis of the pillar and the beam are concentrated at one point in the connecting element.

According to a fourth aspect of the present invention, the first buffer means is detachably attached to the column member on the most upstream side of the dam body, and the second buffer means is mounted on the beam member of the dam body. It is characterized in that it is detachably attached to the.

The invention according to claim 5 is characterized in that the first buffering means and the second buffering means are formed of members whose horizontal cross-sectional shape is a closed cross section.

The invention according to claim 6 is characterized in that deformation restraining means is provided at the ends of the first buffering means and the second buffering means.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an 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.

In FIG. 1, the same numbers as those in FIGS. 3 and 4 indicate the same items. That is, a dam main body composed of a column member 7 and a beam member 8 (a horizontal beam member 8A, an inclined beam member 8B, and a connecting beam member 8C) is constructed on the basic concrete 6. The axes (l) of the column members 7 and the beam members 8 are concentrated at one point (O) in the coupling element 9 filled with the concrete 10.
The first buffer means 14 is detachably attached to the front surface of the column member 7A on the most upstream side via a bracket 14.
Thereby, the external force received by the dam body due to the collision of the boulder with the uppermost stream side column member 7A can be reduced.

The feature of the present invention is that the beam 8 (horizontal beam 8
A, the inclined beam member 8B, and the connecting beam member 8C), the second buffer means 16 is detachably attached via a bracket 17. FIG. 1 shows a case where the second buffer means 16 is mounted on the horizontal beam 8A and the inclined beam 8B. The second buffer means 16 is made of a steel pipe or the like, like the first buffer means 14 attached to the front surface of the most upstream column member 7A.

As described above, the second buffer means 16 is provided on the beam 8.
By attaching the boulder, the boulders that passed through the first buffer means 14 and the dam body (the first buffer means 14)
The external force received by the dam body due to the collision of the boulders that have passed over the beam 8 can be reduced, and the damage to the beam 8 can be reduced. Further, since the second buffer means 16 is freely attached to and detached from the beam member 8, the damaged second buffer means 16 can be easily replaced.

By providing deformation restraining means at the ends of the first buffer means 14 and the second buffer means 16, a further buffer effect can be expected. For example, as shown in FIG. 2, when the first buffering means 14 and the second buffering means 16 are made of a steel pipe, the deformation restraining means is formed by inserting a bolt 18 into the end of the steel pipe and fixing it to a nut 19. Has become.

[0031]

As described above, according to the present invention, the first shock absorbing means is detachably attached to the upstream front surface of the dam body, and the second shock absorbing means is detachably attached to the rear part of the dam body. In addition to absorbing the bombardment impact of boulders on the upstream front of the dam body during floods,
The energy of collision of boulders that have slipped through the damper or over the dam body to the rear of the dam body can be absorbed, so that the dam body can be economically designed, and the damaged first and second damper means can be replaced. This has a useful effect that it can be easily performed.

[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 schematic cross-sectional view showing a buffering unit to which a deformation restricting unit is attached.

FIG. 3 is a side view showing a conventional dam.

FIG. 4 is a front view of a conventional dam viewed from an upstream side.

FIG. 5 is a sectional view showing another connecting element of a conventional dam.

FIG. 6 is a schematic perspective view showing a lattice-type steel sabo dam.

FIG. 7 is a schematic perspective view showing a slit-type steel sabo dam.

FIG. 8 is a schematic perspective view showing a slit type concrete sabo dam.

[Explanation of symbols]

 1: basic concrete 2: pillar 3: beam 4: diagonal 5: connecting beam 6: basic concrete 7: column 7A: most upstream column 8: beam 8A: horizontal beam 8B: inclined beam 8C: Connecting beam 9: Connecting element 9A: Upstream connecting element 10: Concrete 11: Flange 12: Web 13: Reinforcement 14: First buffer 15: Bracket 16: Second buffer 17: Bracket 18: Bolt 19: Nut

Claims (6)

[Claims] 1. A transmission type sabo dam, wherein first damping means for absorbing collision energy of boulders during a flood is attached to an upstream front surface of a dam body. A transmission type sabo dam characterized by being provided with second buffer means for absorbing collision energy of boulders passing through the first buffer means and boulders passing over the dam body. 2. The transmissive sabo according to claim 1, wherein the dam body comprises a pillar fixed on a foundation concrete or a ground and a beam fixed between the columns. dam. 3. The dam body comprises: a foundation concrete;
The steel pipe column material fixed on the foundation concrete, and a steel pipe beam material fixed between the column materials, the column material and the beam material are connected to each other via a steel connection element, The transmission type sabo dam according to claim 1, wherein the axis of the column member and the beam member are concentrated at one point in the coupling element. 4. The first buffer means is detachably attached to the pillar member on the most upstream side of the dam body,
The transmission type sabo dam according to any one of claims 1 to 3, wherein the buffer means is detachably attached to the beam member of the dam body. 5. The device according to claim 1, wherein the first buffering means and the second buffering means are made of a member having a closed cross section in a horizontal cross section. The transmission type sabo dam described in 1. 6. The device according to claim 1, wherein a deformation restraining means is provided at an end of each of the first buffering means and the second buffering means. Transmission type sabo dam.