JP4010539B2 - Steel frame structure - Google Patents

Description

[0001]
[Technical field belonging to the invention]
The present invention relates to a steel frame structure suitable for application to a sabo dam or the like in an area where an impact load such as a debris flow occurs.
[0002]
[Prior art]
Conventionally, a cubic lattice-shaped steel frame assembled by connecting a large number of column members, horizontal materials in the left-right direction and depth materials in the front-rear direction by bolt joints, and a screen material on the front and rear surfaces of the steel frame Installation and filling of the inside filling material to construct a steel frame dam such as a sabo dam.
[0003]
Steel frame dams are superior to concrete structure dams in that they are easy to construct, have a shorter construction period, are less expensive to construct, and are water permeable. In addition, it is a structure that consists of subdivided members connected with bolts, so it can be installed only in places that require urgency, places that are difficult to transport concrete, places that have poor ground conditions, and steel frame structures such as landslide belts It is ideal for building a sabo dam.
However, the steel frame dam is constructed in the area where impact load such as debris flow occurs because the steel frame dam is constructed with a steel frame of bolted connection structure, because the strength is insufficient for impact load. It is generally regarded as not suitable as a sabo dam.
[0004]
For this reason, when a steel frame dam is constructed as a sabo dam in an area where an impact load such as debris flow occurs, it is necessary to provide a buffer structure on the upstream surface of the steel frame dam. As a steel frame dam provided with such a buffer structure, as shown in FIG. 11, steel provided with a buffer wall 32 made of a porous material, bubble mortar, or foamed resin on the upstream surface of the steel frame dam body 31. A frame dam 30 has been proposed (see Japanese Patent Application Laid-Open No. 2000-144692).
[0005]
[Problems to be solved by the invention]
In the conventional steel frame dam 30, since the buffer wall 32 is provided on the upstream surface, damage to the steel frame dam main body 31 can be prevented.
However, when a wall (buffer wall 32) is installed on the upstream surface of the steel frame dam main body 31, there is a problem that water permeability, which is a feature of the steel frame dam, is impaired. In addition, the buffer wall 32 made of porous material, foam mortar, or foamed resin is larger than each member such as a pillar material constituting the steel frame, and is not easy to transport and manufacture. It is unsuitable for sabo dams constructed in places that require urgency or can be installed only with steel frame structures.
[0006]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a steel frame structure suitable for application to a sabo dam constructed in an area where an impact load such as a debris flow occurs.
[0007]
[Means for Solving the Problems]
The present invention for solving the above-mentioned problems is that the left and right columns of at least the front and rear surfaces of a cubic lattice-shaped steel frame assembled by connecting a large number of column members, horizontal members in the left and right direction and depth members in the front and rear direction by bolt joining. As a steel frame dam that can be subjected to impact loads such as debris flow from the front side, which is constructed by installing multiple screen materials horizontally with vertical spacing between materials and filling the inside with filling materials . A steel frame structure,
A column auxiliary member having a plate-like portion perpendicular to the flange surface of the column member and functioning as a spacing member is integrally attached to the front surface of the H-shaped steel column member on the front side of the steel frame. a plurality of steel pipes as a buffer material to the front, to cover the front steel frame in a plane, is attached at intervals in the vertical becomes of
The column auxiliary material is fixed by welding to the front flange of the column material that is H-shaped steel,
The mounting structure of the steel pipe to the column auxiliary material is such that the mounting member having mounting holes on the upper and lower parts is fixed to the back surfaces of both ends of the steel pipe in such a manner that the mounting hole part extends up and down the steel pipe, and the mounting The structure is characterized in that the member is attached to the column auxiliary member with a bolt passing through the attachment hole .
[0008]
According to a second aspect of the present invention, the column auxiliary member in the steel frame structure of the first aspect is a T-shaped cross-section member, and the T-shaped vertical portion is welded and fixed to the front flange of the column member made of H-shaped steel. It is characterized by.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment in which the present invention is applied as a sabo dam installed in an upstream area of a river will be described with reference to FIGS.
FIG. 8 is a schematic front view of the sabo dam 21 constructed by applying the present invention (viewed from the upstream side of the river), and FIG. 9 is a schematic sectional view (left side is upstream). 10 is a perspective view schematically showing a steel frame 13 constituting the sabo dam 21, FIG. 1 is a perspective view showing a detailed structure of one box frame 6 constituting the steel frame 13, FIG. 1 is a front view of FIG. 1, and FIG. 3 is a cross-sectional view taken along line AA of FIG. The box frame 6 shown in FIGS. 1 to 3 is the uppermost box frame 6 of FIG. 9 and includes a buffer structure 15 described later.
As shown in these drawings, the steel frame 13 connects the upper and lower portions of the column members 1 and 2 made of, for example, H-shaped steel provided in the front and back, respectively, with a depth material 3 made of, for example, groove-shaped steel. The upper and lower portions of the column members 1, 1 (or 2, 2) are connected by a horizontal member 5 made of, for example, grooved steel, and the upper and lower portions of the column members 1, 2 are, for example, grooved steel or angle steel. As shown in FIG. 10, the box frame 6 is continuously formed in the left, right, front, rear, top and bottom and assembled as necessary. Then, a plurality of screen materials 9 are mounted horizontally with vertical spacing between the left and right column members 1, 1 (or 2, 2) on at least the front and rear surfaces of the steel frame 13, and the steel is formed at an appropriate stage. The inside of the frame 13 is filled with a filling material, and a lid screen material (not shown) is provided on the uppermost upper surface to construct a sabo dam. In addition, although the detail of the connection structure of each member is abbreviate | omitted, all are bolt joining (joining by a volt | bolt nut). Moreover, the screen material 9 shown in the figure is a lightweight grooved steel, and is fixed to the inner side surface of the outer flange of the column members 1 and 2 that are H-shaped steel with bolts 20 and nuts.
[0011]
In the present invention, the aforementioned buffer structure 15 is provided on the front surface (upstream surface) of the steel frame 13 as necessary. As shown in detail in FIGS. 5 to 7, the buffer structure 15 has a T-shaped column auxiliary material 14 having a T-shaped cross section on the front-side flange surface 1 a of the front-side column material 1 made of H-shaped steel. The vertical portion 14a is welded, and a plurality of steel pipes, for example, square steel pipes 16 are vertically attached to the front surface of the front surface portion 14b of the column auxiliary material 14 with bolts.
[0012]
The specific mounting structure of the rectangular steel pipe 16 to the column auxiliary member 14 will be described. The L-shaped mounting members 18 having bent portions 18a are welded and fixed to the back surfaces of both ends of the rectangular steel pipe 16, The bent portion 18 a of the mounting member 18 is abutted against the edge of the flange 14 b of the column auxiliary material 14, and is fixed to the front surface portion 14 b of the column auxiliary material 14 with a bolt 19.
Thus, since the attachment member 18 is L-shaped, the L-shaped bent portion 18a serves as a guide for attachment to the column auxiliary material 14, and the attachment workability is good. However, a simple flat mounting member without the bent portion 18a can also be used.
[0013]
In the sabo dam 21, when a debris flow occurs on the upstream side and the debris flow rushes to the sabo dam, the debris flow collides with the square steel pipe 16 constituting the buffer structure 15, and the impact is absorbed by the square steel pipe 16. . In this case, the square steel pipe 16 having a hollow cross section deforms in a concave shape when a debris flow collides, and therefore has a greater impact mitigating action than a shaped steel that causes local deformation. Therefore, the square steel pipe 16 can effectively absorb the impact of the debris flow, reduce the impact acting on the bolt joint portion of the steel frame 13, and prevent the steel frame 13 itself from being damaged. As a result, it is possible to construct a sabo dam using a steel frame even in an area where an impact load such as a debris flow occurs.
Further, the square steel pipe 16 is fixed to the pillar material 1 via the column auxiliary material 14, and corresponds to a space (a portion of the vertical portion 14 a of the column auxiliary material 14) between the square steel pipe 16 and the steel frame main body 13. Since this space is a space that allows deformation when the square steel pipe 16 is deformed by applying an impact load to the square steel pipe 16, an impact mitigating action is effectively ensured in this respect as well. . Further, since there is a space, the deformation state of the square steel pipe 16 due to the impact load remains, and the influence (deformation, breakage, etc.) of the impact load on the steel frame body 13 can be easily and clearly investigated.
In addition, since the square steel pipes 16 are horizontally arranged with a space in the vertical direction, unlike the conventional structure in which a buffer wall made of mortar or the like is provided, it is possible to ensure the high water permeability that is characteristic of the steel frame dam. it can.
In addition, since the portion of the bolt 19 that fixes the square steel pipe 16 to the column auxiliary member 14 is in the recessed portion between the vertically adjacent square steel pipes 16, there is little possibility that boulders collide directly with the bolt 19. Breakage can be prevented.
Moreover, since the screen material 9 and the buffer material (square steel pipe 16) are provided in the same horizontal direction, it is simpler than the complicated appearance when a horizontal buffer material is provided for the vertical screen material. Appearance is excellent and the scenery is excellent.
[0014]
In the embodiment, since a square steel pipe is used as the buffer material, it is appropriate in terms of the mounting portion structure, mounting work, handleability, and the like, but a round steel pipe can also be used. In this case, the attachment member 18 may be fixed by flaring welding to the round steel pipe.
Moreover, the buffer structure 15 does not necessarily need to be provided in all the box frames of an upstream surface, and may be provided in a part.
Moreover, although this invention is suitable for application to a sabo dam, it is not necessarily limited to this, For example, it can be applied also to a river, a coastal revetment, etc. In short, the present invention can be applied to a steel frame structure that is installed in a place where an impact load such as a debris flow may be received from the front side .
[0015]
【The invention's effect】
According to the steel frame structure of the present invention , the following effects can be obtained.
(1) Steel pipes with a hollow cross-section have a greater impact mitigating action due to dent deformation than steels that cause local deformation. Therefore, when a debris flow collides, the steel pipe effectively absorbs the impact, The impact acting on the bolt joint can be mitigated and the steel frame itself can be prevented from being damaged. As a result, it is possible to construct a sabo dam using a steel frame even in an area where an impact load such as a debris flow occurs.
(2) Since a space by the column auxiliary material is formed between the steel pipe and the steel frame main body, this space becomes a space that allows deformation when the steel pipe is deformed by an impact load applied to the steel pipe. Even in this respect, the impact relaxation action is effectively secured. Moreover, since the deformation state of the steel pipe is left in this space, it is possible to estimate the impact load applied to the steel pipe based on the deformation of the steel pipe, and the influence (deformation, breakage, etc.) of the debris flow on the steel frame body The survey can be done easily and clearly.
(3) Since it is a buffer structure in which a plurality of steel pipes are arranged at intervals, unlike the conventional structure in which a buffer wall made of mortar or the like is provided, it is possible to ensure high water permeability, which is a feature of a steel frame dam. .
(4) Since the screen material and the buffer material (steel pipe) are provided in the same horizontal direction, it has a simple appearance and is excellent in scenery.
(5) In addition, there is a bolt joint part for fixing the steel pipe to the column auxiliary material in the deepened part between the steel pipes adjacent to each other vertically, and there is little possibility that boulders directly collide with this bolt joint part. There is little risk of damage.
[Brief description of the drawings]
FIG. 1 is a perspective view of a box frame provided with a buffer structure, showing a part of the box frame constituting a steel frame of a steel frame structure according to an embodiment of the present invention.
FIG. 2 is a front view of FIG. 1 (viewed from the upstream side of a river).
3 is a cross-sectional view taken along the line AA in FIG.
4 is a partially cutaway perspective view showing only the buffer structure portion in FIG. 1. FIG.
FIG. 5 is an enlarged view of a main part of FIG. 3;
6 is a left side view of FIG. 5 (viewed from the upstream side of the river).
7 is a cross-sectional view taken along the line BB in FIG.
FIG. 8 is a schematic front view (seen from the upstream side of a river) of a sabo dam using a steel frame structure according to an embodiment of the present invention.
9 is an enlarged cross-sectional view of FIG.
FIG. 10 is a perspective view schematically showing a steel frame in the steel frame structure.
FIG. 11 is a side view schematically showing an example of a conventional steel frame dam using a buffer wall.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 (front side) pillar material 2 (back side) pillar material 3 depth beam 5 horizontal material 6 box frame 7 brace 9 screen material 13 steel frame 14 pillar auxiliary material 14b front surface part 15 buffer structure 16 square steel pipe (steel pipe)
18 Mounting member 18a Bending part 19, 20 Bolt 21 Sabo dam (steel frame structure)

Claims (2)

A plurality of screen materials are placed between the left and right column members of at least the front and rear surfaces of a cubic lattice-shaped steel frame assembled by connecting a large number of column members, horizontal members in the left and right direction, and depth members in the front and rear direction by bolt joining. It is a steel frame structure as a steel frame dam that is installed horizontally with a gap in the vertical direction and filled with filling material inside, which may receive impact loads such as debris flow from the front side ,
A column auxiliary member having a plate-like portion perpendicular to the flange surface of the column member and functioning as a spacing member is integrally attached to the front surface of the H-shaped steel column member on the front side of the steel frame. a plurality of steel pipes as a buffer material to the front, to cover the front steel frame in a plane, is attached at intervals in the vertical becomes of
The column auxiliary material is fixed by welding to the front flange of the column material that is H-shaped steel,
The mounting structure of the steel pipe to the column auxiliary material is such that the mounting member having mounting holes on the upper and lower parts is fixed to the back surfaces of both ends of the steel pipe in such a manner that the mounting hole part extends up and down the steel pipe, and the mounting A steel frame structure having a structure in which a member is attached to a column auxiliary member with a bolt passing through the attachment hole .   2. The steel frame structure according to claim 1, wherein the column auxiliary member is a T-shaped cross-section member, and a vertical portion of the T shape is welded and fixed to a front flange of a column member made of H-shaped steel. .

Images