JP2012207373A - Steel slit dam - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steel slit dam greatly excellent in workability and economical efficiency, including self-standing steel pipe materials which can be constructed without welding work for mounting flanges thereon.SOLUTION: A steel slit dam 11 comprises a plurality of self-standing chevron steel pipe materials 10 each of which has an upstream-side steel pipe material 1 and a downstream-side steel pipe material 2 assembled via a girth 3 in a shevron-shape inclining to the flowing direction of river water and installed on a concrete foundation 9, and which are installed at spaces in a direction perpendicular to the flowing direction of the river water. The girth 3 has an upper end integrally joined to the upper end of the upstream-side steel pipe material 1 at a shevron apex angle with welding work, and the downstream-side steel pipe material 2 has an upper portion on the inner face of which a protrusion and a reinforcement are provided and in which concrete 8 can be filled. Into the upper end opening of the downstream-side steel pipe material 2, the lower end of the girth 3 is inserted, and then buried and joined with the concrete 8 filled therein.

Description

  The present invention belongs to the technical field of steel slit dams in which steel materials are connected and arranged at regular intervals to effectively capture a falling material such as driftwood or debris flow. The present invention relates to a steel slit dam which is assembled by connecting steel materials only in the flowing direction, and can easily remove the captured falling material by a heavy machine.

Conventionally, steel slit dams that connect steel materials and arrange them at regular intervals to effectively catch downflows such as driftwood or debris flow are used as countermeasures for driftwood capture or debris flow capture. ing.
This steel slit dam has various shape and structure technologies, but especially when installed as a driftwood capture work measure, it is important to not only capture driftwood but also to easily remove the captured driftwood. Is done. There is a steel slit dam in which a plurality of steel pipe members that do not connect the heads to each other even if arranged continuously in the lateral direction as a shape and structure that makes it easy to remove the captured driftwood (for example, patents) Reference 1).

In Patent Document 1, as shown in FIG. 4 of Patent Document 1, a pair of upstream steel pipe material 1 and downstream steel pipe material 2 are inclined at the same angle, and the tops thereof are connected to each other. A steel slit dam formed by installing a plurality of steel pipe materials (sabo bodies) A which are bolted at the portion 3 and bolted at the midway portion thereof by the connecting member 4 and formed in an A-shaped alphabet when viewed from the side. It is disclosed.
According to this steel slit dam, the steel pipe material A is installed without connecting the heads to each other even in a continuous arrangement in the lateral direction. There is an advantage that the arm can easily enter between the adjacent steel pipe materials A and A and the trapped driftwood can be easily removed.

  Incidentally, the steel pipe material A is transported in a state where the upstream side steel pipe material 1 and the downstream side steel pipe material 2 are separated in consideration of transportation by truck (especially transportation width). The work which joins these steel pipe materials 1 and 2 is performed.

Japanese Utility Model Publication No. 55-10436

  The steel pipe material (sabo body) A constituting the steel slit dam of Patent Document 1 is a structure in which a pair of upstream steel pipe material 1 and downstream steel pipe material 2 are joined at the top of each other. There were problems as described below.

Explaining the joining method between the tops, as shown in FIG. 4 of the same document 1, when the steel pipes 1 and 2 are bolted together, the horizontal direction of the tops of the steel pipes 1 and 2 and A flange having a special shape in the vertical direction is welded, and a number of bolts are joined and connected to the flange. Moreover, since the said flange is provided in a special site | part, the reinforcement rib for hold | maintaining this flange was also welded.
Specifically, the flanges provided in the horizontal direction of the steel pipe materials 1 and 2 are flush with each other, and the cover plate provided with the bolt holes on the flange is the bolt hole of the flange where the bolt holes are flush with each other. The bolts were placed so as to coincide with each other, and bolts were passed through the matched bolt holes and fastened with nuts. At the same time, the flanges (gazette plates) provided in the vertical direction of the steel pipe materials 1 and 2 were overlapped so that the bolt holes coincided with each other, and bolts were passed through the matched bolt holes and fastened with nuts.
Therefore, in order to join the tops of the steel pipe materials 1 and 2, welding work for providing flanges with bolt holes in the horizontal direction and vertical direction, and reinforcing ribs for holding the flanges are provided. In addition to the need for welding work, the cover plate and a large number of bolts are required, and the amount of welding, the amount of processing, and the number of members are large, which is troublesome. In addition, the horizontal flanges of the steel pipe materials 1 and 2 must be flush with each other, and at the same time, a large number of bolt holes provided in the vertical flange must be matched, and the size of the steel pipe material (diameter 40-60 cm) About 2 to 6 m in length, about 1500 to 4300 kg in weight), and high-precision field work was required.
Moreover, the steel pipe material A according to Patent Document 1 needs to perform the work of connecting the midway part in the horizontal direction by using the connecting member 4 in addition to the above-described joining work of the top of the head. Become prominent.

It is an object of the present invention to provide a steel slit dam (bottomed inner surface protrusion) on a downstream side of a steel slit dam that is assembled by connecting steel materials only in the flowing direction of the falling material and can easily remove the captured flowing material by a heavy machine. Insert the connecting material (H-shaped steel, square steel pipe, etc.) joined to the upper end of the upstream steel pipe material into the upper end opening of the steel pipe) and fill (press-fit) the concrete to join Therefore, compared with the above-mentioned Patent Document 1, the cover plate, the reinforcing rib, the flange, and the bolt can be made useless, and it is independent without performing welding work for attaching the flange, flange positioning work, and bolt joining work. It is to provide a steel slit dam that can construct a steel pipe material of a type that is extremely excellent in workability and economy.
Moreover, it is providing the steel slit dam which can reduce the direct hit | damage to the joining site | part of a driftwood, and can improve safety | security further by providing the site | part to join downstream.

As a means for solving the above-mentioned background art problem, the steel slit dam according to the invention described in claim 1 connects the upstream steel pipe member and the downstream steel pipe member by inclining them in the flow direction of the river water. It is a steel slit dam in which a plurality of self-supporting angle-shaped steel pipes that are assembled in a mountain shape via a material and installed on a concrete foundation are spaced apart in a direction perpendicular to the flow direction of river water. ,
The connecting member is integrally joined to the upper end of the upstream steel pipe by welding at an angle that forms the apex angle of the chevron, and the downstream steel pipe has an upper portion thereof. The inner surface is provided with protrusions and reinforcing bars so that it can be filled with concrete, and the lower end of the connecting material is inserted into the upper end opening of the steel pipe material on the downstream side, and the concrete is filled and embedded and joined. It is characterized by being made.

  According to a second aspect of the present invention, in the steel slit dam according to the first aspect, the steel pipe material on the downstream side has a steel pipe with a bottomed inner protrusion at the upper end of the steel pipe material that rises inclined from the concrete foundation. It is characterized by being welded.

  A third aspect of the present invention is the steel slit dam according to the first or second aspect, wherein the connecting material is an H-shaped steel, a square steel pipe, or a round steel pipe having a bearing plate at its lower end. Or an H-shaped steel, a square steel pipe, or a round steel pipe with an external projection.

  The invention described in claim 4 is characterized in that, in the steel slit dam described in any one of claims 1 to 3, heads of the adjacent self-supporting angle steel pipe members are not connected to each other.

According to the steel slit dam according to claims 1 to 4, the following effects can be obtained.
The lower end of a connecting material (H-shaped steel, square steel pipe, etc.) that is integrally joined to the upper end of the upstream steel pipe is inserted into the upper end opening of the downstream steel pipe (bottomed steel pipe with internal protrusion). In addition, it is possible to make the cover plate, the reinforcing rib, the flange, and the bolt useless, and to attach the flange, etc., compared with the above-mentioned Patent Document 1, by carrying out the structure in which the concrete is filled (press-fit) and embedded and joined. A self-supporting angle steel pipe can be constructed without performing welding work, flange positioning work, and bolt joining work. Therefore, it is very excellent in workability and economical efficiency.
Moreover, by providing the site | part to join downstream, the direct hit to the junction site | part of a driftwood can be reduced, and safety can be improved more.

A is the schematic which showed the whole structure of the steel slit dam seen from the upstream, B is the schematic which showed the whole structure of the steel slit dam seen from the downstream, C is from the side direction 1 schematically shows the overall structure of a Mita steel slit dam (self-supporting angle steel pipe). Incidentally, in FIG. 1C, the symbol U indicates the upstream side, the symbol D indicates the downstream side, and the arrow indicates the flow direction of the river water. It is the elevation which expanded and showed the self-supporting angle-shaped steel pipe material which concerns on FIG. 1C. It is the elevation which expanded and showed the joining state of the upper end part of the self-supporting angle-shaped steel pipe material which concerns on FIG. It is a disassembled perspective view of the self-supporting angle-shaped steel pipe material which concerns on FIG. It is the disassembled perspective view which showed the variation of a self-supporting angle-shaped steel pipe material. It is the elevation which expanded and showed the joining state of the upper end part of the self-supporting angle-shaped steel pipe material which concerns on FIG. It is the elevation which expanded and showed the joining state of the upper end part of the self-supporting angle-shaped steel pipe material concerning Example 2. FIG.

  Next, an embodiment of a steel slit dam according to the present invention will be described with reference to the drawings.

As shown in FIGS. 1 to 3, the steel slit dam 11 inclines the upstream steel pipe 1 and the downstream steel pipe 2 in the flow direction of the river water (inclination angle is 60 to 70 degrees). Degree), a plurality of self-supporting angle-shaped steel pipes 10 assembled in a mountain shape via the connecting material 3 and installed on the concrete foundation 9 with an interval in a direction perpendicular to the flow direction of the river water. .
The connecting material 3 is integrally joined to the upper end of the upstream steel pipe 1 by welding at an angle forming the apex angle of the chevron, and the downstream steel pipe 2 is The upper portion is provided with protrusions and reinforcing bars on the inner surface so that it can be filled with concrete. The lower end of the connecting member 3 is inserted into the upper end opening of the steel pipe member 2 on the downstream side, and the concrete 8 Is filled and embedded and joined.
Incidentally, the downstream steel pipe member 2 according to the present embodiment is implemented by a structure in which a steel pipe 2a with a bottomed inner surface projection is welded and joined to an upper end portion of a steel pipe member 2b that rises inclined from a concrete foundation. .
The lower ends of the steel pipe materials 1 and 2 are respectively embedded and fixed almost uniformly in the concrete foundation 9.
In addition, the heads of the adjacent self-supporting angle-shaped steel pipe members are not connected to each other.

In short, as shown in FIG. 4, the self-supporting angle-shaped steel pipe member 10 according to the steel slit dam 11 of the present invention is joined to the upstream side steel pipe member 1 and the connecting structure which are joined in an almost inverted shape. The steel pipe material on the upstream side which is transported to the site in a two-part structure of the material 3 and the steel pipe material 2 on the downstream side (the steel pipe 2a and the steel pipe material 2b having a bottomed inner surface protrusion) and forms the two-part structure on the site 1 and a connecting material 3 and a downstream steel pipe material 2, and the connecting material 3 and a downstream steel pipe material 2 (steel pipe 2 a with a bottomed inner surface protrusion) are joined together through a concrete 8 to form a mountain shape. It implements by the structure formed in.
In addition, the bottomed steel pipe 2a with an inner surface protrusion may be transported to the site in a state separated from the steel pipe material 2b and may be joined by on-site welding.

In the present embodiment, the connecting material 3 is provided with a bearing plate (base plate) 3a at the lower end portion by a welding means such as welding, and the upper end portion is cut into a shape along the outer peripheral surface of the upstream steel pipe material 1 as a joining partner. The processed square steel pipe 3 is used, and the upper end of the square steel pipe 3 is welded and joined to the upper end (top) of the upstream steel pipe 1. The connecting material 3 is not limited to a square steel pipe, and can be implemented by an H-section steel 13 (see FIGS. 5 and 6) provided with a bearing plate 13a at the lower end, or a round steel pipe. This can also be implemented with a square steel pipe (see FIG. 7), an H-shaped steel, or a round steel pipe.
The bottomed inner surface-protruded steel pipe 2a is used for improving adhesion strength with the concrete 8 to be filled, and a veneer plate having a rigidity enough to withstand the internal pressure of the concrete 8 to be filled at the lower end. A plurality of ring-shaped protrusions are provided at equal intervals on the inner surface of the steel pipe provided with the bottom plate member. The steel pipe 2a with an inner surface protrusion has a material cost higher than that of a general steel pipe, so that the length necessary for transmitting a load via the adhesive force with the concrete 8 to be filled (1250 mm in this embodiment). Degree).

  The upstream steel pipe material 1 and the connecting material (square steel pipe in the illustrated example) 3 are inclined at an upper end of the upstream steel pipe material 1 by about 40 to 60 degrees with respect to the pipe axis direction (that is, an angle-shaped steel pipe). The upper end portion of the connecting material 3 is fixed by welding at an angle (vertical angle), and is formed in a substantially inverted letter shape as a whole. A base plate 5 reinforced by reinforcing ribs 6 is fixed to the lower end portion of the upstream steel pipe member 1 by welding.

  The bottomed steel pipe 2a with a protruding inner surface and the steel pipe 2b forming the steel pipe 2 on the downstream side are sized so that the outer diameters coincide with each other. ing. In addition, a joining means is not limited to welding, It can also implement by bolt joining. In the case of carrying out by bolt joining, a pair of flat flanges or ring-shaped flanges are provided on the joining end face portions, and bolts are passed through the bolt holes provided in the outer peripheral edge of the flanges and tightened with nuts. . A base plate 5 reinforced by reinforcing ribs 6 is fixed to the lower end portion of the downstream steel pipe material 2 (steel pipe material 2b) by welding.

Here, reference is made to the dimensions of the self-supporting angle-shaped steel pipe member 10 according to the illustrated example and its constituent members. The height of the self-supporting angle steel pipe 10 is about 3 m excluding the embedding length (about 1 m).
The upstream steel pipe 1 has a length of about 3500 mm, a diameter of about 500 mm, and a thickness of about 12 mm. The bottomed steel pipe 2a with the inner surface projection is about 1250 mm in length, about 500 mm in diameter, about 9 mm in thickness, material SKK490, the height of the inner surface projection 4 is about 2.5 mm, and the interval between the inner surface projections 4 is about 40 mm. . The steel pipe material 2b has a length of about 2000 mm, a diameter of about 500 mm, and a thickness of about 12 mm.
The connecting material (square steel pipe) 3 has a length of about 800 mm, a cross section of a square shape with a side of about 200 mm, and a thickness of about 8 mm. The bearing plate 3a has a square shape with a cross section of about 250 mm on a side and a thickness of about 24 mm.
Of course, the numerical value is not limited to this, and the design can be changed as appropriate according to the width of river water to be installed, the number of freestanding angle-shaped steel pipe members 10, the assumed flow rate of river water, and the like.
Moreover, since the arrangement | positioning space | interval of the said adjacent self-supporting angle-shaped steel pipe material 10 is determined from the investigation result of the installation field, it is not uniform but is suitably changed in design according to a condition, but generally a space | interval of about 1-7m Is adopted.

Thus, the upstream-side steel pipe material 1 and the connecting material (square steel pipe) 3 and the downstream-side steel pipe material 2 (the steel pipe 2a with a bottomed inner surface protrusion and the steel pipe material 2b) having the above-described configuration are the bottomed inner surface. The steel pipe materials 1 and 2 are tilted at the same angle (about 65 degrees) in the state where the connecting material 3 is inserted at a depth of about 50 cm in the central portion in plan view in the protruding steel pipe 2a, and is almost symmetrical. Form in a mountain shape of arrangement. The insertion depth of the connecting material 3 is preferably about twice the diameter of the connecting material 3.
Thereafter, the bottomed inner surface protruding steel pipe 2a is filled (press-fitted) with concrete, and the joining material 3 and the bottomed inner surface protruding steel pipe 2a are joined via the concrete 8 to provide a self-supporting angle steel pipe. The material 10 is constructed.
It is preferable that the central axis of the connecting member 3 and the central axis of the downstream steel pipe member 2 (the steel pipe 2a with a bottomed inner surface protrusion and the steel pipe member 2b) are substantially coincided with each other. Since it is sufficient that the load (pushing force) acting on the steel pipe material 1 (joining material 3) can be reliably transmitted to the steel pipe material 2 on the downstream side, a slight misalignment is allowed. Incidentally, in this embodiment, a misalignment of about 50 mm is allowed.

The construction method of the self-supporting angle-shaped steel pipe material 10 is as follows. First, two divided structures, that is, an upstream steel pipe material 1 with a joining material 3 welded to the upper end portion, and a downstream steel pipe material 2 are provided. The steel pipe materials 1 and 2 are inclined at the same angle (about 65 degrees) in a state where the connecting material 3 is inserted at a depth of about 50 cm in the center portion in a plan view inside the steel pipe 2a with an inner protrusion at the bottom. It is embedded and fixed in the concrete foundation 9 to be independent.
Specifically, in a state where the connecting material 3 is inserted into the bottomed inner surface protruding steel pipe 2a, the two divided structures are erected by a heavy machine such as a crane, and the central axis of the connecting material 3 is The base plates 5 and 5 provided at the lower end portions of the steel pipe materials 1 and 2 are hit to the lower surface of the base plate while maintaining a substantially symmetrical mountain shape in which the central axis of the steel pipe material 2 on the downstream side is substantially coincident. The steel pipe materials 1 and 2 are built by fixing them with anchor bolts 7 on the foundation concrete. After that, the lower ends of the steel pipe materials 1 and 2 are embedded and fixed in the concrete foundation 9 with concrete cast to the top of the foundation. In addition, about each said center axis line, about 50 mm misalignment can transmit a favorable axial force (compressive force) through the concrete 8 on structural mechanics, and is accept | permitted.
Next, embedded joining is performed in which concrete 8 is filled into the bottomed steel pipe 2a with an inner surface protrusion into which the lower half portion of the connecting material 3 is inserted. The concrete filling operation may be a method of filling from the upper end opening of the bottomed inner surface protruding steel pipe 2a, or a method of preliminarily providing a filling hole on the outer periphery of the lower end (bottom) and press-fitting from the filling hole. .

  By the way, such embedded joints allow a center misalignment of about 50 mm with respect to the central axis in terms of structural mechanics. Therefore, a highly accurate joining operation is not required as compared with the flange joining described in Patent Document 1. It is extremely superior. However, if necessary, a position adjusting bolt is screwed into the outer peripheral surface of the upper end portion of the inner surface protruding steel pipe 2a from four directions to restrain horizontal displacement of the connecting member 3 to be inserted, or the inner surface protruding steel tube 2a. At the top of the plate, welding a plate having an opening corresponding to the planar shape of the connecting material 3 at the center, and constraining the horizontal displacement of the connecting material 3 to be inserted, etc. Is performed as appropriate.

  Moreover, the upper part of the self-supporting angle-shaped steel pipe material 10 is preferable for the joining part of the connecting material 3 and the bottomed inner surface protruding steel pipe 2a. This is because, in addition to reducing the material cost of the connecting material 3, it is possible to permanently maintain a strong joined state with a smaller bending moment acting on the upper part than on the lower part, rather than in the lower part. This is because it is less likely to be exposed and the transport width of the divided trucks is taken into consideration.

Therefore, according to the steel slit dam 11 described above, the connecting material (bonded to the upper end portion of the upstream steel pipe material 1 into the upper end opening of the downstream steel pipe material 2 (bottomed inner surface protruding steel pipe 2a) ( By inserting the rectangular steel pipe) 3 and filling (press-fit) the concrete 8 and joining it, the cover plate, the reinforcing rib, the flange, and the bolt can be made useless compared to the above-mentioned Patent Document 1, The self-supporting angle steel pipe member 10 can be constructed without performing welding work for attaching a flange or the like, flange positioning work, and bolt joining work. Therefore, it is very excellent in workability and economical efficiency.
Moreover, by providing the site | part to join downstream, the direct hit to the junction site | part of a driftwood can be reduced, and safety can be improved more.

FIG. 7 shows a different embodiment of the steel slit dam according to the present invention.
The self-supporting angle steel pipe 10 ′ related to the steel slit dam is different from the self-supporting angle steel pipe material 10 according to the first embodiment in that a square steel pipe 23 with an outer surface protrusion 23 a is used as a connecting material. Is different. Incidentally, although the protrusion 23a in the illustrated example is schematically shown, the protrusion height is usually about 2 to 3 mm and the protrusion interval is about 30 to 40 mm.
In Example 1, in order to reliably transmit the load (pushing force) acting on the upstream side steel pipe material 1 (tie material 3) to the downstream side steel pipe material 2, a support plate 3a is provided on the joint material 3, and A certain layer thickness of the concrete 8 located below the bearing plate 3a is provided. However, in the present embodiment of the second embodiment, by using the square steel pipe 23 with the outer surface projection as a connecting material, the adhesion strength of the filled concrete 8 is dramatically increased as compared with the first embodiment, and the upstream steel pipe. A load (pushing force) acting on the material 1 (the connecting material 23) can be reliably transmitted to the steel pipe material 2 on the downstream side. Therefore, the expensive steel pipe 2a with internal protrusions can be shortened to about half, and the amount of the filled concrete 8 can be reduced, which is very economical.
Therefore, according to the second embodiment, in addition to the function and effect of the first embodiment, it is more economical.

The embodiments have been described with reference to the drawings. However, the present invention is not limited to the illustrated embodiments, and design modifications and application variations that are usually made by those skilled in the art are within the scope of the technical idea of the invention. Note that it includes the range.
For example, since the steel slit dam 11 according to the present invention is mainly implemented as a driftwood capture work countermeasure, the internal structure of the self-supporting angle-shaped steel pipe material 10 is implemented with a hollow, but is not limited thereto,
Of course, the upstream steel pipe 1 and the downstream steel pipe 2 may be filled with a filler such as concrete.
Further, in this embodiment, the upper part of the downstream steel pipe material 2 is implemented with a bottomed inner surface protruding steel pipe 2a, but is not limited thereto, and a steel pipe with reinforcing bars arranged on the inner surface is used instead. Any steel pipe that increases the adhesion strength with the filled concrete 8 may be used. The veneer plate that forms the bottom of the steel tube 2a with the inner surface protrusion is not changed to the steel tube 2a side with the inner surface protrusion, but is appropriately changed in design, such as being provided at the upper end of the steel pipe member 2b that rises inclined from the concrete foundation 9. It is where it is said.
Furthermore, the form of the said base plate 5 is not limited to the example of illustration, It can implement with a various variation on the condition that the self-supporting angle-shaped steel pipe material 10 can be installed in the stable state. Of course, the installation quantity and form of the self-supporting angle-shaped steel pipe member 10 are not limited to the illustrated example, and are appropriately increased or decreased according to the width of the river bed to be installed, the estimated flow rate of the river water, etc. Various variations such as two horizontal rows can be implemented.

DESCRIPTION OF SYMBOLS 1 Steel pipe material of an upstream side 2 Steel pipe material of a downstream side 2a Steel pipe with a bottomed inner surface protrusion 2b Steel pipe material 3 Connecting material (square steel pipe)
3a Bearing plate (base plate)
4 Protrusions 5 Base plate 6 Reinforcement rib 7 Anchor bolt 8 Concrete 9 Concrete foundation 10 Self-supporting angle steel pipe 10 'Self-supporting angle steel pipe 11 Steel slit dam 13 Connecting material (H-shaped steel)
13a Bearing plate (base plate)
23 Connecting material (square steel pipe with external projection)
23a protrusion

Claims (4)

A self-supporting mountain-shaped steel pipe, which is installed on a concrete foundation by inclining an upstream steel pipe and a downstream steel pipe in the direction of the flow of river water and forming a mountain shape via a connecting material, Is a steel slit dam that is installed in the direction perpendicular to each other at intervals,
The connecting member is integrally joined to the upper end of the upstream steel pipe by welding at an angle that forms the apex angle of the chevron, and the downstream steel pipe has an upper portion thereof. The inner surface is provided with protrusions and reinforcing bars so that it can be filled with concrete, and the lower end of the connecting material is inserted into the upper end opening of the steel pipe material on the downstream side, and the concrete is filled and embedded and joined. A slit dam made of steel.   2. The steel slit dam according to claim 1, wherein the steel pipe material on the downstream side is formed by welding a steel pipe with a bottomed inner protrusion to a top end portion of a steel pipe material that is inclined and rises from a concrete foundation. .   The connecting material is an H-section steel, a square steel pipe, or a round steel pipe having a bearing plate at the lower end, or an H-section steel, a square steel pipe, or a round steel pipe with an external protrusion. The steel slit dam according to claim 1 or 2. The steel slit dam according to any one of claims 1 to 3, wherein heads of adjacent self-supporting angle-shaped steel pipe members are not connected to each other.

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