JP2019085807A - Installation structure for drifting wood catching body - Google Patents

Abstract

To provide an installation structure for drifting wood catching body in which there is of course no need of large-scale work such as notching or rising a check dam 10, and that does not require a concrete foundation by realizing a structure that can support a drifting wood catching body 1 in a cantilevered state only by using the check dam 10, and that is superior in workability, economic efficiency and stability.SOLUTION: The present invention is an installation structure for a drifting wood catching body 1 with respect to a check dam 10, the installation structure being provided with a plurality of steel column members 2 each provided so as to project in a cantilevered state via a base member 3 that protrudes from an upstream lateral surface part of the check dam to the upstream side. As an example, the steel column member 2 is formed of the heads of a drifting wood catching prop (upstream vertical member) 2a and a downstream support prop (diagonal member) 2b that slopes forward on the upstream side being integrated by means of welding, the steel column member 2 being formed in an inverted U shape that opens toward the flowing direction of a river.SELECTED DRAWING: Figure 1

Description

The present invention provides a driftwood trapping work consisting of steel column members and the like on the upstream side of a dam (hereinafter collectively referred to as "sabo dams") constructed in the cross direction of the river for the purpose of erosion control and bank management. Belongs to the technical field of the structure to be installed.
The sabo dams may be established or newly built. In addition, it does not matter whether the full sand or the less sand condition on the upstream side of the sabo dam.

In recent years, there has been a demand for improving the above-mentioned sand control levee so as to add a driftwood catching function to the sand control levee in order to prevent disasters on the downstream side more efficiently.
The above-mentioned means for adding the driftwood catching function to the sandbanks has pointed out the problem that a large-scale operation such as notching or raising the sandbanks is required. As shown, at this year, a technology is disclosed that can introduce driftwood capture work to a sabo dam without the need for the large-scale work.

  In the patent document 1, a catchment body for catching driftwood flowing from the upstream of the river is installed in the vicinity of the river's sweep section, having a water passage portion through which running water flows and in the vicinity of the embankment on which the sediment has accumulated In the installation method of the capturing body, when the distance from the water passing portion along the flow direction of the river to the capturing body is L1, the length of the driftwood is L, and the movement limit particle diameter is D, 2 × D ≦ The capturing body is installed on the sediment deposited on the upstream side of the dam in a position facing the entire opening surface of the water passing portion so as to satisfy the relationship of the mathematical expression of L1 ≦ 1/2 × L. A method of installing the capture body is disclosed (see the description of claim 1 and FIGS. 1 and 2).

  The above-mentioned Patent Document 2 is an improved sabo-dikes improved structure in which a driftwood capture work is provided to an existing impermeable type sand control breakwater to improve it, and a driftwood capture member formed by joining a steel pipe column and a steel pipe beam vertically and horizontally. The sandbank improved structure according to the present invention, characterized in that the driftwood catching member is provided so as to project upstream from the sandbank by joining with a jointing material which protrudes to the upstream side from both sleeves of the sandbank. Are disclosed (see the description of claim 1 and FIGS. 1 to 3).

  According to the item of [effect of the invention] of the patent documents 1 and 2, since the driftwood capturing body can be installed without requiring a large-scale work such as cutting or raising the sabo dam, the workability, A statement stating that the economy is excellent is accepted.

JP, 2017-72020, A JP, 2017-101507, A

However, as is clear from the drawings of the documents 1 and 2, both the techniques according to the Patent Documents 1 and 2 described above are based on a concrete foundation (a foundation part) using driftwood capture work (capture body 3 etc., driftwood capture member 3). Installation on concrete foundation 9) is an essential requirement.
Therefore, it takes time and cost for placing concrete, and it also takes time and cost for excavating deposited soil (bed excavation of a concrete foundation part) in a sand control dam with full sand condition. It is obvious that if the driftwood trapping work can be realized without using, the above-mentioned labor and cost will be eliminated and the workability and economy will be improved.

  In addition, in the technology according to the Patent Document 1, since only the foundation portion made of concrete supports the capturing body, the supporting force of the foundation (structure) is insufficient when installing on sedimentation. There is concern about sinking, falling, spilling, etc. In addition, in the case of a sandbank with less sand, the required trap height is high, which is uneconomical.

  Therefore, the present invention has been devised in view of the problems of the background art described above, and the purpose thereof is that there is no need for a large-scale operation such as notching or raising the sabo dam. Besides, by realizing a structure that can support the driftwood trapping work in a cantilevered state only with the sabo dams, the concrete foundation is made useless, and the installation structure of the driftwood trapping work excellent in construction efficiency, economy, and stability It is to provide.

  As a means for solving the above problems, the installation structure of the driftwood trapping work according to the invention described in claim 1 is an installation structure of the driftwood trapping work on the sand control levee, wherein a plurality of steel column members are respectively the above-mentioned It is characterized in that it is provided in a cantilevered state via a base member that protrudes to the upstream side from the upstream side surface portion of the sabo dam.

  According to the invention set forth in claim 2, in the installation structure of the driftwood trapping work described in claim 1, the plurality of steel column members are set at a distance of 1/2 or less of the maximum possible driftwood length between each other. It is characterized by being.

  The invention described in claim 3 is that in the installation structure of the driftwood trapping work described in claim 1 or 2, two or more steel column members are arranged in the upstream front direction of the water passing portion of the sand control dam It is characterized in that

  The invention described in claim 4 is the installation structure of the driftwood trapping work described in any one of claims 1 to 3, wherein two or more steel columns are respectively provided in the front side of the upstream side of both sleeves of the sabo dam It is characterized in that the member is arranged.

  The installation structure of the driftwood catching work according to the invention according to the fifth aspect is the setting structure of the driftwood catching work on the sand control levee, wherein the steel column and the steel beam are joined longitudinally and horizontally to be integrated. The driftwood capturing body is provided in a cantilevered state through support members on the left and right sides respectively protruding upstream from both sleeves of the sandbank.

  According to a sixth aspect of the present invention, in the installation structure of the driftwood trapping work according to the fifth aspect, the steel pillars of the driftwood trapping body have a mutual distance of 1/2 or less of the maximum possible driftwood length. It is characterized in that it is set to.

  The invention according to claim 7 is the installation structure of the driftwood trapping work according to claim 5 or 6, wherein the steel pillar material of the driftwood trapping body is the upstream of the drifting portion of the sand control dam It is characterized in that two or more steel columns are arranged in the front side direction.

  The invention according to claim 8 is the installation structure of the driftwood trapping work according to any one of claims 5 to 7, wherein the steel pillars and / or the steel beam members of the driftwood trapping body are sandbanks It is characterized in that it is supported by a base member protruding from the upstream side surface portion of the main body to the upstream side.

  The invention according to claim 9 is that in the installation structure of the driftwood trapping work according to any one of claims 1 to 8, the base member and the support member are anchored to the sand control levee main body It features.

According to the installation structure of the driftwood catching work according to the present invention, it is possible to support the driftwood catching work in a cantilever state only by the sand control breakwater, as well as eliminating the need for large-scale work such as notching or raising the sand control breakwater. It is possible to realize the installation structure of the driftwood trapping work which can make the concrete foundation useless and is excellent in workability, economy and stability.
Specifically, since it can be realized by omitting a large-scale work such as notching or raising the sand control levee, it is extremely excellent in construction efficiency and economy. In addition, since the driftwood trapping work is carried out in a configuration in which the drifting catcher projects in a cantilevered state upstream from the sabo dam, it is possible to effectively catch drifting articles such as driftwood without blocking the water passing portion. Become. Furthermore, it will be possible to install driftwood capture work not only on new constructions, but also on less-than-existing sand conditions.
Since the drifting material such as driftwood is captured by the driftwood trapping work extended out of the surface direction of the erosion control levee, in the removal work after trapping driftwood, the presence of both sleeves of the erosion control dam is not an obstacle in the open space Work can be realized. Therefore, it is excellent in work efficiency.
In the case where the above-mentioned sabo dam is in a full sand state, since the earth and sand work for constructing a concrete foundation which has been conventionally required is not required at all, the workability and the economy are very excellent.
In addition, since the important point of the driftwood capture work is carried out by flange connection, it is very excellent in maintainability, such as easy removal and maintenance work at the time of replacement.

A is a side view showing Example 1 of the installation structure of the driftwood catching work according to the present invention, B is a front view seen from the downstream side, and C is a plan view. A is a side view showing Example 2 of the installation structure of the driftwood catching work according to the present invention, B is a front view as viewed from the downstream side, and C is a plan view. A is a side view showing Example 3 of the installation structure of the driftwood trapping work according to the present invention, B is a front view seen from the downstream side, and C is a plan view. A is a side view showing Example 4 of the installation structure of the driftwood catching work according to the present invention, B is a front view seen from the downstream side, and C is a plan view. A is a front view seen from the downstream side showing Example 5 of the installation structure of the driftwood trapping work according to the present invention, B is a B-B arrow sectional view of A, C is A It is a top view.

  Next, an embodiment of the installation structure of the driftwood trapping work according to the present invention will be described based on the drawings.

1A to 1C show the installation structure of the driftwood trapping work according to the first embodiment.
The installation structure of the driftwood catching work 1 according to the illustrated example is the setting structure of the driftwood catching work 1 with respect to the sand control levee 10, and the plurality of steel column members 2 are respectively upstream from the upstream side surface portion of the sand control levee It is provided projecting in a cantilever state via the protruding base member 3.
That is, the installation structure of the driftwood trapping work 1 according to the present invention is largely characterized by the configuration in which there is no (concrete) concrete foundation for supporting the driftwood trapping work 1.

  The steel column member 2 can be supported by the base member 3 in a cantilevered state, and further, the driftwood capturing work 1 consisting of the steel column member 2 and the base member 3 is, in its entirety, a driftwood etc. On the condition that a slit capable of capturing the falling-off material can be formed, the design can be appropriately changed to a flexible form regardless of the illustrated example.

In the steel column member 2 according to the illustrated example, as an example only, the driftwood capturing support (upstream-side vertical member) 2a and the downstream support post (diagonal member) 2b inclined forward to the upstream are welded to each other at the head It is formed in the shape of an inverted letter which is united by this and opens in the flow direction of the river. On the other hand, the base member 3 is provided with a horizontal member 3a having two projecting end portions coaxially connected to the lower end portions of the driftwood capturing support column 2a and the downstream side support support column 2b, and a square wand member (brick material) 3b. Are integrally formed by welding one end portions. Then, the flowwood capture support column 2a and the downstream side support support column 2b of the steel column member 2 and the two projecting end portions of the horizontal member 3a are flange-joined 6, 7, and the horizontal member 3a and the square cane member 3b The component members of the driftwood catching work 1 are constructed by being fixed to the upstream side surface of the sand control dam 10 by the anchor bolt 5 via the common base plate 4 provided at the other end (proximal end) of the Ru.
Incidentally, reference numeral 11 in the figure indicates a water-passing portion, reference numeral 11 a indicates a sleeve butt which constitutes both end portions of the water-passing portion 11, and reference numeral 12 indicates a sleeve.

  In the present embodiment, three members of the same shape and size as the steel column member 2 and the base member 3 having the above-described configuration are prepared, and in the area of the water passing portion 11 of the sand control dam 10 They are installed to coincide with each other when viewed from the side direction, and the driftwood trapping work 1 is constructed. Taking into consideration that the maximum driftwood length assumed in the present embodiment is about 5 m in the present embodiment, the equal intervals are set to about 2.5 m, which is 1/2 of that.

In addition, the height of the said steel-made pillar member 2 is implemented by about 2.5 m which aligned the top end with the sleeve top end of the sabo dam 10. As shown in FIG. As an example, STK 490 having an outer diameter (φ) of 318.5 mm and a wall thickness of 10.3 is preferably used for all steel pipes used.
Further, the distance between the steel column member 2 and the sabo dam 10 is set (determined) based on the assumed maximum driftwood length. By the way, in the present embodiment, the maximum driftwood length is assumed to be about 5 m, and the distance between the axial core (dam axis) of the driftwood catching post 2a and (the upstream side surface portion of) the sandbag 10 is set to 2.5m. It is carried out.
Incidentally, the upstream side of the sleeve portion 12 of the sand control dam 10 has a side view vertical shape (see FIG. 1A) as one of the significance of using the driftwood capture support column 2a perpendicular to the dam axis of the steel column member 2 In particular, it is possible to effectively capture falling materials such as driftwood by arranging them in a substantially parallel arrangement. Therefore, if the upstream side of the sleeve portion 12 is to be implemented in the side view inclined shape, it is possible to substitute the vertical driftwood capturing support column 2a and realize an arrangement in parallel with the sleeve portion 12 in the downstream direction. It is preferable to use a fixed driftwood capture support.

Of course, the number and size of the steel column member 2 and the base member 3 (drift wood trapping work 1) used are not limited to the above, and the size of the sabo dam 10, the water passing portion, as well as the assumed maximum drift length. The design can be changed as appropriate based on the width of 11 and the characteristics of the river at the time of flood (estimated water level, assumed flow rate, drifting width of driftwood), and trapping simulation of driftwood by image analysis.
In particular, it should be noted that the base member 3 is implemented with a structure having sufficient strength and rigidity to support the steel column member 2 sufficiently even in a cantilever state, such as using the square cane 3b.
Incidentally, although the height of the steel column member 2 is about 2.5 m in this embodiment, it is suitably in the range of 1 to 5 m depending on the amount of trapped driftwood assumed and the depth of the weir raised by driftwood trapping. Design change is possible. The diameter of the steel pipe (φ) to be used is preferably about 20 to 50 cm, and the thickness of the steel pipe is preferably in the range of about 8 to 16 mm.
The bottom width dimension of the water-permeable portion 11 according to the present embodiment is about 5 m, and the width dimension of the sleeve butt is about 1 m or less.

Therefore, according to the installation structure of the driftwood trapping work according to the first embodiment, it is not only necessary to carry out the large-scale work such as notching or raising the sand control dam 10, but only the driftwood trapping work 1 is Since a structure that can be supported in a cantilevered state can be realized, a concrete foundation can be rendered useless, and an installation structure of driftwood trapping with excellent workability, economy, and stability can be realized.
In particular, since the driftwood catching work 1 is carried out in a configuration in which the drifting catchment 1 projects in a cantilevered state upstream from the erosion control levee 10, it effectively catches a drifting material such as driftwood without blocking the water passing portion 11. It becomes possible.
If it explains concretely, the position which the said driftwood catcher 1 overhangs 2.5m which is 1/2 or less of the maximum driftwood length in the front (upstream side front direction) side by the side of water passage 11 (bottom width about 5m) The three steel column members 2 (especially, the driftwood capturing support columns 2a) are implemented in a structure in which they are erected in a cantilever state by the base member 3 with a well-balanced distance of 2.5 m between the left and right.
Therefore, the drifting material such as driftwood flowing down the river is reliably captured by the steel column member 2 installed at a distance (2.5 m) equal to or less than half of the assumed maximum driftwood length, and hence the driftwood trapping work 1 The drifting material such as driftwood which is going to wrap around behind (backward) the driftwood trapping work 1 is secured by the steel column member 2 and the base member 3 (in particular, the downstream support strut 2b) of the driftwood trapping work 1 It is possible to effectively prevent the outflow of downstream materials such as driftwood.

2: A-C have shown the installation structure of the driftwood trapping work which concerns on Example 2. FIG.
The installation structure of the driftwood trapping work 20 according to the second embodiment is the same as that of the first embodiment except that the steel column member 2 (and the base member 3), which is a component of the driftwood trapping work 20, Not only the upstream side front direction of the sleeves 12 but also the upstream side front direction of the both sleeves 12 is increased by two or more (two in the illustrated example).
Therefore, the installation structure of the driftwood catching work 20 according to the second embodiment is carried out with the same concept as the first embodiment, for example, with the configuration without a concrete foundation for supporting the driftwood catching work 20. The same effect as that of the first embodiment can be obtained (see the above paragraph [0028]). In addition, there is also an advantage that it can be applied to a river where the flow width of the driftwood is wider than that of the first embodiment. In addition, it also plays a role of protecting both sleeves 12, 12 near the water passage 11.

FIGS. 3A to 3C illustrate the installation structure of the driftwood trapping work according to the third embodiment.
The installation structure of the driftwood catching work 30 according to the third embodiment is the setting structure of the driftwood catching work 30 with respect to the sabo dam 10, and the steel column 31 and the steel beam 32 are joined in a longitudinal and transverse direction to be integrated. A driftwood catching body formed in a cantilevered manner is provided by being provided in a cantilever state via the left and right supporting members 33 which respectively project to the upstream side from the both sleeves 12 of the sabo dam 10.
That is, the installation structure of the driftwood catching work 30 according to the present invention is also characterized largely by the configuration in which there is no concrete foundation for supporting the driftwood catching work 30.

  The driftwood trapping body, which is a main component of the driftwood trapping work 30, is, in essence, a structure that can be supported in a cantilever state by the support member 33, and more specifically, a driftwood trapping body composed of the driftwood trapping body and the support member 33 The design can be appropriately changed to a flexible form regardless of the illustrated example, on the condition that the work 30 can form a mesh structure capable of capturing the falling material such as driftwood as a whole.

The driftwood capturing body according to the illustrated example is implemented by a configuration in which two steel column members 31 and two steel beam members 32 are appropriately joined by flange joint 34 at necessary places and arranged vertically and horizontally There is. Incidentally, in the illustrated example, two steel pillars 31 are provided in a well-balanced manner in the out-of-plane direction of the water passing portion 11 with an interval of 2.5 m which is 1/2 of the maximum driftwood length. .
Further, the two steel beam members 32 are joined at their both ends to upper and lower two-tiered support members 33 which project substantially horizontally from the two sleeves 12 of the sand control dam 10 in the upstream front direction. Therefore, it is fixed to the said Sabo dam 10. The base end of the supporting member 33 is fixed by placing the base plate 35 on the upstream side surface of the sand control dam 10 and driving an anchor bolt 36, and the tip end of the supporting member 33 is the steel beam 32. It is joined by welding to the both ends of.

The "necessary point" related to the flange joint 34 refers to a portion suitable for easily replacing a damaged or deteriorated steel pipe material, and further, a portion capable of replacing concrete without breaking as much as possible. For example, the steel beam member 32 is flange-joined so that it can be separated and exchanged with the support member 33 and the like protruding from the sabo dam 10.
Thus, the driftwood capturing body has a cantilevered overhang structure in which both arm portions (both ends of the steel beam 2) are firmly joined to the sand control barrier 10 through the support members 33, and the planar direction is obtained. From the perspective of drawing, the configuration is such that a substantially frame-like pocket P is formed by the steel beam 32, the erosion control levee 10, and the support member 33 connecting these.

In addition, the height of the said steel-made column material 31 is implemented by about 2.5 m arrange | equalizing the top end to the sleeve top end (sleeve crotch shoulder in the example of illustration) of the sand control dam 10. As shown in FIG. As an example, STK 490 having an outer diameter (φ) of 318.5 mm and a wall thickness of 10.3 is preferably used for all steel pipes used.
Moreover, the driftwood trapping body provided with the steel pillars 31 sets (determines) the distance to the sabo dam 10 based on the assumed maximum driftwood length. By the way, in the present embodiment, assuming that the maximum driftwood length is about 5 m, the distance between the shaft core (dam axis) of the steel column 31 and (the upstream side surface portion of) the sandbag 10 is 2.5 m. It is set and carried out.
Incidentally, the upstream side of the sleeve portion 12 of the sand control dam 10 has a side view vertical shape (see FIG. 3A) as one of the meanings of carrying out the steel pillars 31 (dam axis) of the driftwood capturing body in the vertical direction. In order to effectively capture falling materials such as driftwood by arranging them in a substantially parallel arrangement. Therefore, if the upstream side of the sleeve portion 12 is to be implemented in an inclined shape in a side view, the steel pillars 31 of the driftwood capturing body are also inclined so as to be disposed substantially parallel to the sleeve portion 12 It is preferable to carry it out.

Of course, the number and size of the steel pillars 31, steel beams 32, or support members 33 (drift wood trapping work 30) used are not limited to the above, and the sandbanks 10 are considered to have a maximum possible driftwood length. Scale, width of the water-passing part 11, river characteristics at the time of flood (expected water level, assumed flow rate, drifting width of driftwood), appropriate distance for trapping driftwood, and simulation of trapping driftwood by image analysis etc. Based on, design change is possible suitably.
In particular, it should be noted that the support member 33 is implemented in a structure with sufficient strength and rigidity to sufficiently support the driftwood capturing body even in a cantilever state.
Incidentally, although the height of the steel column 31 is about 2.5 m in this embodiment, the height is appropriately in the range of 1 to 5 m depending on the amount of trapped driftwood assumed and the depth of weir raising by driftwood trapping. Design change is possible. However, the top position of the steel column 31 and the height position of the upper steel beam 32 joined to the top are slightly higher than the water level of the river so that falling objects such as driftwood can be effectively captured. It is set high. The diameter of the steel pipe (φ) to be used is preferably about 20 to 50 cm, and the thickness of the steel pipe is preferably in the range of about 8 to 16 mm.

Thus, the installation structure of the driftwood capturing work 30 constitutes the support member 33 provided with the base plate 35 of the above-described configuration on both sleeves 12 and 12 of the sand control dam 10, and the end of the steel beam 32. By joining with the L-shaped steel pipe material, a foundation on which the main body (central portion) of the driftwood catching work 30 can be installed is constructed.
Thereafter, the main body of the driftwood catching work 30 is positioned on the flanges of the base at various places, and the corresponding portions are flanged 34 so that the horizontally long girder-like driftwood catching work 30 takes on the sandbanks. It is possible to realize an overhanging structure that overhangs in a cantilever state from 10 on the upstream side.

Therefore, according to the installation structure of the driftwood trapping work according to the third embodiment, it is not only necessary to perform a large-scale work such as cutting or raising the sand control dam 10, but the driftwood trapping work 30 is limited to the sandbank 10 only. Since a structure that can be supported in a cantilevered state can be realized, a concrete foundation can be rendered useless, and an installation structure of driftwood trapping with excellent workability, economy, and stability can be realized.
In particular, since the driftwood capturing work 30 is carried out in a configuration in which the drifting catcher 30 projects in a cantilevered state upstream from the sand control dike 10, it effectively captures a drifting material such as driftwood without blocking the water passing portion 11. It becomes possible.
Specifically, after securing the area of the pocket P, the driftwood catching work 30 overhangs the front (upstream side front direction) 2.5 m on the water passing portion 11 (bottom width about 5 m) side. The two steel column members 31 are spaced 2.5 m apart in a balanced manner from side to side, and the supporting members 33 are erected in a cantilevered state.
Therefore, the drifting material such as driftwood flowing down the river can be reliably captured by the steel pillars 31 installed at intervals (2.5 m) of the estimated maximum driftwood length (2.5 m), and thus the driftwood trapping work 30. The drifting material such as driftwood which is going to wrap around behind (rearward) the driftwood trapping work 30 can be reliably captured by the support member 33 of the driftwood trapping work 30, and thereby downstream of the drifting flow of the driftwood etc. Spills can be effectively prevented.
In addition, even if the driftwood capturing work 30 is blocked by a drifting material such as driftwood, the river water overflowing from the blocking site flows into the area of the pocket P and passes through the water passing portion 11. In other words, since the driftwood capturing work 30 plays the role of a filter, there is no possibility that the water passage part 11 is blocked, and it is possible to maintain safe and good running water.

4A to 4C show the installation structure of the driftwood trapping work according to the fourth embodiment.
The installation structure of the driftwood catching work 40 according to the fourth embodiment is similar to that of the third embodiment in the same manner as the second embodiment with respect to the first embodiment, but is different from the third embodiment, and according to the form of the sand control levee 10 With the provision of 31 not only in the upstream front side direction of the water passage portion 11 but also in the upstream side front direction of the both sleeve portions 12, the number of steel column members 31 used is changed from 2 to 7 as a whole. The main difference is the increased point, the elongated steel beam 32.
Therefore, the installation structure of the driftwood catching work 40 according to the fourth embodiment can realize a structure which can support the driftwood catching work 40 in a cantilever state only by the sand control dam 10, so that the concrete foundation can be rendered unusable. Since the installation structure of the driftwood trapping work excellent in economy and stability can be realized, the same concept as in the third embodiment is applied, so the same effect as the third embodiment can be achieved. (See above paragraph [0037]). Furthermore, there is also an advantage that it can be applied to a river where the flow width of driftwood is greater than that of the third embodiment.

  In addition, as shown in FIG. 5, when there is a concern about stabilization of the whole driftwood capture work 40 by having made steel beam material 32 long (especially increase of the width of the water passage part 11, etc.) The steel pillars 31 and / or the steel beams 32 (in particular, the steel pillars 31 disposed in the central portion) of the driftwood capturing body project from the upstream side surface of the main body of the sabo dam 10 to the upstream side Of course, it can also be implemented with a structure that is stiffened by the provided base member 3 (horizontal member 3a and square cane member 3b). As a result, the load that the steel beam member 32 bears can be shared, the span can be shortened, the member dimensions can be prevented from increasing, and a rational structural design can be achieved.

As described above, the first to fifth embodiments have been described based on the drawings, but the present invention is not limited to the examples shown in the drawings, and variations in design changes and applications normally made by those skilled in the art without departing from the technical concept thereof. It is mentioned just to include the scope of.
For example, the driftwood trapping works 1, 20, 30, 40 are all installed in a line symmetrical arrangement with the axis of symmetry of the water passage portion extending in the flow direction of the river as the axis of symmetry, but it is not limited thereto . Of course, it can also be carried out in a non-linearly symmetrical arrangement according to the nature of the river at the time of flood (the assumed water level, the assumed flow rate, the sweep section, etc.).

1 driftwood capture work 2 steel column member 2a vertical member 2b diagonal member 3 base member 3a horizontal member 3b square wand member 4 base plate 5 anchor bolt 6 flange joint (flange)
7 Flange connection (flange)
DESCRIPTION OF SYMBOLS 10 Sabo dam 11 Watering part 11a Sleeve Small part 12 Sleeve part 20 Slug capture work 30 Slug capture work 31 Steel pillar 32 Steel beam 33 Support member 34 Flange connection (flange)
35 Base plate 36 Anchor bolt 40 Driftwood trap

Claims (9)

It is the installation structure of driftwood capture work for the Sabo dam,
A plurality of steel column members are respectively provided in a cantilevered state via a base member protruding upstream from the upstream side surface of the sand control levee, and the installation structure of the driftwood trapping work is characterized. .   The installation structure of the driftwood trapping work according to claim 1, wherein a distance between each of the plurality of steel column members is set to 1/2 or less of the assumed maximum driftwood length.   The installation structure of the driftwood trapping work according to claim 1 or 2, characterized in that two or more steel column members are arranged in the upstream front side direction of the water passing portion of the sabo dam. .   The two or more steel column members are each arrange | positioned in the upstream front direction of the both sleeves of the said sabo dam, It was comprised so that it described in any one of Claims 1-3 characterized by the above-mentioned. Installation structure of driftwood capture work. It is the installation structure of driftwood capture work for the Sabo dam,
A driftwood capturing body formed by joining steel pillars and steel beams vertically and horizontally and integrated, is cantilevered via the left and right support members which respectively project upstream from the both sleeves of the sand control levee. The installation structure of the driftwood trap, which is characterized in that it is provided by overhanging.   The installation structure of the driftwood trap according to claim 5, characterized in that the steel pillars of the driftwood trap are set to have a distance of 1/2 or less of the assumed maximum driftwood length. .   The driftwood capture body according to claim 5 or 6, characterized in that two or more steel pillars are disposed in the front direction on the upstream side of the water passage portion of the sabo dam. Installation structure of capture work.   The steel pillars and / or steel beams of the driftwood capturing body are supported by a base member protruding from the upstream side surface portion of the sand control dike main body to the upstream side. The installation structure of the driftwood trap described in any one of ~ 7.   The installation structure of a driftwood trap according to any one of claims 1 to 8, wherein the base member and the support member are anchored to the sand control dike main body by an anchor.

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