JP6653405B1 - How to install the capturing body - Google Patents

Abstract

An object of the present invention is to provide a method of installing a capturing body that can effectively capture driftwood. A method of installing a capturing body is a method of installing a capturing body 1 for capturing driftwood flowing from an upstream of a river on an upstream side of an impermeable type sabo dam 2. A plurality of capturing bodies are arranged so as to be arranged in a direction inclined with respect to the flow direction. [Selection diagram] Fig. 1

Description

  The present invention relates to a method for installing a capturing body.

  DESCRIPTION OF RELATED ART Conventionally, in order to catch the driftwood which flows from the upper stream of a river, the capture body installed in the upstream of the existing impermeable type sabo dam, for example is known (for example, refer patent document 1). The capturing body of Patent Literature 1 includes one beam portion extending along the extending direction of the bank and a plurality of pillar portions connected at predetermined intervals along the extending direction of the beam portion. Have.

  The length of the trapping body in the extending direction is smaller than the water passage width of the water passage part of the dam so that driftwood flowing from the upstream does not pass between the trapping body and the dam and does not flow downstream. It is set to be long.

JP 2017-72020A

  In the capturing body, since the capturing surface facing the upstream side is formed in a straight line in the extending direction, when the driftwood captured by the capturing surface increases, the water passage on the capturing surface is blocked by the driftwood. I will go. Therefore, while the water flowing from the upstream becomes difficult to pass through the capturing surface, the amount of water passing between the capturing body and the shore increases. If the water path on the catching surface is almost completely blocked by driftwood, the water flowing from the upstream will not be able to pass sufficiently downstream from between the catching body and both banks. Will overflow the body. As a result, there is a problem that driftwood flowing from the upstream also overflows the capturing body, and the driftwood cannot be effectively captured.

  In particular, if the penetration width of the penetration part of the impermeable type sabo dam is larger than the river width, the distance between the trapping body and both banks will be small, so the water flowing from the upstream will be trapped. Overflowing easily, and the above-mentioned problem occurs remarkably.

  Then, this invention is made | formed based on the said subject, The objective is to provide the installation method of the capturing body which can capture a driftwood effectively.

Installation of the captor according to the present invention, there is provided a method of installing captor installing the captor for capturing a driftwood flowing from upstream of the river upstream of opaque type Sabo dams, located on the most upstream side A plurality of capturing bodies are installed at intervals in a direction inclined with respect to the flow direction of the river so that the capturing bodies approaching both banks toward the downstream side with the capturing body as a vertex .

According to this configuration, the plurality of capturing bodies are arranged so as to be spaced apart from each other and arranged in a direction inclined with respect to the flow direction of the river. Therefore, even if a water path is blocked by driftwood in one capturing body, a water path is secured between the capturing body and the adjacent capturing body. Furthermore, depending on the flow of the river, the driftwood flowing from the upstream is captured by a plurality of capturing bodies so as to be divided into two in the transverse direction orthogonal to the flow direction of the river, or one in the transverse direction. Are trapped by a plurality of traps so as to be biased toward. Therefore, a water passage is easily secured between the adjacent capturing bodies, so that water flowing from the upstream hardly overflows the capturing body. Therefore, driftwood flowing from the upstream can be effectively captured. In addition, some capture bodies may be arrange | positioned in the position which overlaps in the cross direction.

  In particular, when a catching body is installed on the upstream side of a weir where the water passing width of the water passing part is large with respect to the river width, water cannot sufficiently escape from the space between the catching body and the shore to the downstream side. In addition, since water can escape to the downstream side between the adjacent capturing bodies, water flowing from the upstream hardly overflows the capturing body. Therefore, the driftwood flowing from the upstream can be effectively captured.

  In the above-described configuration, an interval in the flow direction of the river between the adjacent capturing bodies may be set to an interval of １ ／ to の of the set driftwood length.

  According to this configuration, it is possible to secure a water passage between the adjacent capturing bodies while maintaining the capturing effect of the driftwood by the plurality of capturing bodies. That is, if the distance between the adjacent capturing bodies is larger than 1/2 of the set driftwood length, the driftwood easily flows to the downstream side from between the adjacent capturing bodies. In addition, when the distance between the adjacent capturing bodies is smaller than 1/3 of the set driftwood length, the water path between the adjacent capturing bodies is easily blocked by the driftwood. The driftwood length is set according to the width of the river and the height of the trees growing upstream.

In the above configuration, a plurality of capturing bodies may be installed at an interval from each other so as to be inclined in one direction with respect to the flow direction of the river. An interval in the flow direction of the river between the trapping body installed on the most upstream side and the impermeable sabo dam may be set to an interval equal to or longer than a set driftwood length. An interval in a transverse direction orthogonal to a flow direction of the river between the capturing body installed on the most upstream side and a shore may be set to an interval of 1/2 or less of the set driftwood length.

  According to this configuration, since the transverse distance between the capturing body installed at the most upstream side and the shore is set to be equal to or less than 1/2 of the set driftwood length, the capturing body closest to the shore and the shore The interval between is reduced. Therefore, it is possible to make it difficult for the driftwood flowing from the upstream to pass downstream from between the capturing body closest to the shore and the shore. In addition, the interval in the flow direction of the river between the adjacent capturing bodies is set to an interval of 1/3 to 1/2 of the set driftwood length. Therefore, it is possible to secure a water path while obtaining the effect of capturing driftwood. Therefore, even if the interval in the flow direction of the river between the capturing body on the most upstream side and the impervious sabo dam is set to an interval equal to or longer than the set driftwood length, driftwood will be downstream of the impermeable sabo dam. Outflow can be suppressed. In addition, some capture bodies may be arrange | positioned in the position which overlaps in the cross direction.

  ADVANTAGE OF THE INVENTION According to this invention, the installation method of the capturing body which can capture a driftwood effectively can be provided.

It is a top view showing the state where a capture object was installed by an installation method of an acquisition object concerning a 1st embodiment of the present invention. It is a side view showing the state where a capture object was installed by an installation method of a capture object concerning a 1st embodiment of the present invention. It is an outline top view showing the state where a capture object was installed by an installation method of an acquisition object concerning a modification of a 1st embodiment of the present invention. FIG. 7 is a simplified plan view showing a state where a capturing body according to a modification of the first embodiment of the present invention is installed. It is an outline top view showing the state where a capture object was installed by an installation method of an acquisition object concerning a 2nd embodiment of the present invention. It is an outline top view showing the state where a capture object was installed by an installation method of an acquisition object concerning a 3rd embodiment of the present invention. It is an outline top view showing the state where a capture object was installed by an installation method of an acquisition object concerning a 4th embodiment of the present invention.

  Hereinafter, first to fourth embodiments of the present invention will be described with reference to the drawings. However, each drawing referred to below shows, for convenience of description, main components necessary for explaining the capturing body 1 used in the method of installing the capturing body according to the first to fourth embodiments of the present invention. This is shown in a simplified manner. Therefore, the capturing body 1 used in the method for installing the capturing body according to the first to fourth embodiments of the present invention may include arbitrary components not shown in the drawings referred to in this specification.

(1st Embodiment)
In the method for installing a catcher of the first embodiment, a catcher 1 for catching driftwood flowing from an upstream of a river is placed upstream of an existing impermeable sabo dam 2. The dam 2 has a bottom part buried in the ground and extends along a direction (hereinafter, simply referred to as “transverse direction D2”) orthogonal to the flow direction of the river (hereinafter, simply referred to as “flow direction D1”). It is built as follows.

  The dam 2 has a water passage portion 8 which is cut out at the upper end so as to be recessed downward from a central portion in the transverse direction, and a sleeve portion provided to extend from both sides of the water passage portion 8 in the transverse direction D2 to both banks. And 9. The water passage section 8 is formed to allow water flowing from the upstream to flow downstream of the bank 2.

  As shown in FIGS. 1 and 2, the capturing body 1 includes a plurality of pillars 3 arranged at intervals in the transverse direction D2, and extends in the transverse direction D2 to connect the plurality of pillars 3 in the transverse direction D2. It has a horizontal beam member 4 and a support portion 5 that supports each pillar 3 from the downstream side.

  The plurality of pillars 3 are formed of a steel pipe. The interval between the pillar portions 3 adjacent to each other in the transverse direction D2 is set to an interval corresponding to １ ／ or less of the set driftwood length. The driftwood length is set according to the width of the river and the height of the tree growing upstream, and can be set to, for example, 1.3 times the width of the river.

  In this embodiment, three pillars 3 are provided, but at least two pillars are sufficient. The shape of each column 3 may be, for example, a column or a prism as long as it is formed to extend upward. Further, the column 3 may be formed of an H-shaped steel.

  The support part 5 is formed of a steel pipe. In addition, the support part 5 may be formed of H-shaped steel. The shape of the support 5 may be a column or a prism as long as the column 3 can be supported. As shown in FIG. 2, the support portion 5 extends in a horizontal direction from a surface facing the downstream side of each pillar portion 3 and extends so as to be bent obliquely downward. In addition, the support part 5 may extend in a horizontal direction from a surface facing the downstream side of each column part 3 and may be bent vertically and extend straight downward. Note that the support portion 5 may be omitted.

  The capturing body 1 captures driftwood by the pillars 3 and the horizontal rails 4 adjacent in the transverse direction, and forms a water passage in a gap between the adjacent pillars 3 and the horizontal rails 4.

  The capturing body 1 is connected to a base 6 buried in a riverbed of a river. The base part 6 is formed by combining H-shaped steel in a frame shape. The base part 6 is for securing stability when the capturing body 1 is installed on a riverbed. In addition, the base part 6 may be formed of a steel pipe.

  The base part 6 has a first connecting part 6a extending in the flow direction D1 and a second connecting part 6b extending in the transverse direction D2. The lower end of the pillar 3 and the lower end of the support 5 are connected by a first connecting portion 6a. The lower ends of the plurality of pillars 3 are connected by a second connecting part 6b. The lower ends of the plurality of support portions 5 are connected by a second connection portion 6b.

  A portion of the first connecting portion 6a extends in the flow direction D1 from the lower end of the pillar portion 3 to a position protruding in the upstream direction, and extends in the flow direction D1 to a position protruding downstream from the lower end of the support portion 5. ing. A part of the first connecting portion 6a connects the capturing body 1 and the capturing body 1 installed at an interval from each other in a direction inclined with respect to the flow direction D1 in the flow direction D1. Hereinafter, the capturing bodies 1 and 1 that are installed at an interval from each other in a direction inclined with respect to the flow direction D1 are referred to as adjacent capturing bodies 1 and 1.

  A concrete block includes a portion protruding upstream from the lower end of the column portion 3 in the first connecting portion 6a of the base portion 6 and a portion protruding downstream from the lower end of the supporting portion 5 in the first connecting portion 6a. 7 is placed. Thereby, the self-weight of the base part 6 is gained, and the stability when the capturing body 1 is installed on the riverbed is improved.

  The capturing body 1 configured as described above is installed on the upstream side of the existing impermeable type sabo dam 2 as follows.

  First, at the installation site, a determination step of determining an installation position of the capturing body 1 to arrange the plurality of capturing bodies 1 at predetermined positions is performed. In the determination step, the installation position of the capturing bodies 1 is determined so that the plurality of capturing bodies 1 are arranged at intervals in the direction inclined with respect to the flow direction D1. The installation position is determined so that the center of each capturing body 1 (in the example of FIG. 1, the middle pillar 3) is spaced apart in the direction inclined in the flow direction D <b> 1. In the example of FIG. 1, a plurality of capturing bodies 1 are spaced apart in a direction inclined with respect to the flow direction D1 so that the capturing body 1 located at the most upstream side is located at the apex and approaching both banks toward the downstream side. This is an example of a case in which the positioning is performed in a line. In this case, the distance L1 between the adjacent capturing bodies 1, 1 in the flow direction D1 is set based on the column portion 3. The interval L1 is set to an interval of 1/3 to 1/2 of the set driftwood length.

  In addition, as shown in FIG. 1, the pillars 3, 3 of the adjacent capturing bodies 1, 1 may be installed at positions where the pillars 3, 3 of the adjacent capturing bodies 1, 1 overlap with each other in the flow direction D <b> 1. They may be installed so that they do not overlap in the flow direction D1. Moreover, you may install so that the adjacent capture bodies 1 and 1 may not overlap in the flow direction D1.

  Further, the installation positions of the two capturing bodies 1 located at the most downstream side are set to positions overlapping with the sleeve 9 of the bank 2 in the flow direction D1 in addition to the above installation positions. In the present embodiment, a portion corresponding to about half in the transverse direction in the capturing body 1 is set at a position overlapping the sleeve 9 in the flow direction D1. Furthermore, the installation position of the two capturing bodies 1 located at the most downstream side is such that the distance L2 in the flow direction D1 between the pillar 3 and the sleeve 9 of the capturing body 1 is 1/3 of the set driftwood length. The interval is set to １ ／.

  When the setting step is completed, an installation step of installing the plurality of capturing bodies 1 at the installation positions set in the setting step is performed. In the installation step, first, an excavation operation for burying the base portion 8 in the riverbed is performed so that the plurality of capturing bodies 1 can be installed at the installation position. The excavation depth is set to such a depth that the base portion 8 and the lower end portions of the plurality of capturing bodies 1 can be buried in the riverbed.

  Next, the base 6 is placed on the excavated portion so that each capturing body 1 is located at the installation position, and a portion protruding upstream from the lower end of the column 3 in the base 6; The concrete block 7 is placed on the portion protruding downstream from the lower end of the support 5. In this state, the lower end of the capturing body 1 is buried in the riverbed together with the base 6 and the concrete block 7 (see FIG. 2).

  The portion buried in the riverbed may be only the base portion 6. In addition, if the capturing body 1 can be stabilized on the riverbed only by the weight of the concrete block 7, the operation of excavating the riverbed may be omitted. In this case, the base part 6 is merely mounted on the riverbed. Further, the concrete blocks 7, 7 adjacent in the flow direction D1 may be connected by a connecting member such as a chain.

  In the method for installing a capturing body according to the first embodiment, a plurality of capturing bodies 1 are installed at intervals from each other in a direction inclined with respect to the flow direction D1. Therefore, even if a water path is blocked by driftwood in one capturing body 1, a water path is secured between the capturing body 1 and the adjacent capturing body 1. Therefore, water flowing from the upstream hardly overflows the capturing body 1. Therefore, driftwood flowing from the upstream can be effectively captured.

  In particular, when the capturing body 1 is installed on the upstream side of the bank 2 where the water width of the water-permeable portion 8 is large, the distance between the capturing body 1 installed on the most downstream side and the shore becomes short. Therefore, even if the water cannot be sufficiently released to the downstream side from between the capturing body 1 closest to the shore and the shore, the water can be released downstream through the space between the adjacent capturing bodies 1. Can be. Therefore, water flowing from the upstream hardly overflows the capturing body 1. Therefore, driftwood flowing from the upstream can be effectively captured.

  In the method for installing a catcher of the first embodiment, the interval L1 in the flow direction D1 between the adjacent catchers 1 is set to 1/3 to 1/2 of the set driftwood length. Therefore, it is possible to secure the water passage between the adjacent capturing bodies 1 while maintaining the capturing effect of the driftwood by the plurality of capturing bodies 1. That is, if the distance between the adjacent capturing bodies 1 is larger than 1/2 of the set driftwood length, the driftwood is likely to flow out from between the adjacent capturing bodies 1 to the downstream side. When the distance L1 between the adjacent capturing bodies 1 is smaller than 1/3 of the set driftwood length, the water path between the adjacent capturing bodies 1 is blocked by the driftwood. It is easy to come off.

  In the method of installing the capturing body according to the first embodiment, when the shape of the river on the upstream side of the bank 2 is straight, the driftwood flowing from the upstream flows straight toward the capturing body 1, Driftwood flowing through the center of the trapping body 1 is trapped in contact with the trapping body 1 located at the center in the transverse direction D2 of the plurality of trapping bodies 1. Driftwood flowing near both sides of the river is captured by contacting the capturing body 1 near both sides of the river. That is, the driftwood flowing from the upstream is captured by the plurality of capturing bodies 1 so as to be divided in both the transverse direction D2. Further, when the shape of the river on the upstream side of the bank 2 is curved, the driftwood flowing from the upstream comes obliquely to the trapping body 1, so that the driftwood is biased in one of the transverse directions D2. Is captured by a plurality of capturing bodies 1. Therefore, a water passage is easily secured between the adjacent capturing bodies 1, and water flowing from the upstream hardly overflows the capturing body 1.

  The method of installing the capturing body described above is an embodiment of the present invention, and the specific configuration can be appropriately changed without departing from the spirit of the present invention. Hereinafter, a modified example of the first embodiment of the present invention will be described. In the modified example of the first embodiment, elements corresponding to the capturing body 1 of the first embodiment are denoted by the same reference numerals as those of the capturing body 1 of the first embodiment, and description thereof will be omitted.

(Modification of First Embodiment)
In the method for installing the capturing bodies according to the first embodiment, the adjacent capturing bodies 1 and 1 are all arranged so as to be spaced apart from each other in a direction inclined with respect to the flow direction D1, as shown in FIG. In addition, the two capturing bodies 1, 1 located in the central part of the river may be installed so as to overlap in the transverse direction D2. In this case, an interval L3 in the transverse direction D2 between the capturing bodies 1 installed at positions overlapping in the transverse direction D2 is set to be equal to or less than 1/2 of the set driftwood length.

  In the method of installing the capturing body according to the first embodiment, the downstream capturing body 1 is installed such that only the end pillars 3 overlap the upstream capturing body 1 in the flow direction D1. May be installed so that the area overlapping with the capturing body 1 in the flow direction D1 increases. In the example of FIG. 3, one of the two capturing bodies 1 on the downstream side is configured such that the two pillars 3 overlap the upstream capturing body 1 in the flow direction D1. It is installed in.

  In the method for installing the capturing body according to the first embodiment, the capturing body 1 is configured to include the column 3, the crosspiece 4, and the support 5, but the capturing body 11 according to the modified example is configured as shown in FIG. As shown in (1), the horizontal rail member 4 and the support portion 5 are omitted, and two pillar portions 3, 3 are arranged at intervals in the transverse direction D2. In this case, two pillars 3 are erected on the basis of the concrete block 7 cast on the riverbed. The capturing body 11 according to the modified example captures driftwood by the two pillars 3 and 3 adjacent in the transverse direction D2, and has water in a gap between the pillars 3 and 3 adjacent in the transverse direction D2. Form a path for

  The plurality of capturing bodies 11 according to the modified example configured as described above are installed such that the central portions of the two pillars 3, 3 adjacent in the transverse direction D2 are arranged in a direction inclined in the flow direction D1. . In the example of FIG. 4, the plurality of capturing bodies 11 are set such that the capturing body 11 located at the most upstream side is a vertex such that only one pillar 3, 3 in the adjacent capturing bodies 11, 11 overlaps in the flow direction D <b> 1. It is installed so that it approaches both banks toward the downstream side. In addition, you may install so that the adjacent capture bodies 11 and 11 may not overlap in the flow direction D1.

  An interval L1 in the flow direction D1 between the adjacent capturing bodies 11, 11 is set based on the column 3 as in the first embodiment. The interval L1 is set to an interval of 1/3 to 1/2 of the set driftwood length.

  Further, the two capturing bodies 11 located at the most downstream side are installed at positions overlapping with the sleeve 9 of the bank 2 in the flow direction D1, as in the first embodiment. Further, an interval L2 in the flow direction D1 between the pillar 3 and the sleeve 9 of the two capturing bodies 11 located at the most downstream side is set to an interval of 1/3 to 1/2 of the set driftwood length. Is done.

(2nd Embodiment)
Next, a method for installing the capturing body according to the second embodiment will be described. Hereinafter, in the second embodiment, elements corresponding to those in the first embodiment will be denoted by the same reference numerals as those in the first embodiment, and description thereof will be omitted.

  In the method of installing the capturing bodies according to the second embodiment, as shown in FIG. 5, a plurality of capturing bodies 1 are installed in a concave shape at intervals in a direction inclined with respect to the flow direction D1. That is, the plurality of capturing bodies 1 are installed so that the capturing body 1 located at the most downstream side is located at the apex and approaches both banks toward the upstream side. In the method for installing a catcher of the second embodiment, the interval L4 in the transverse direction D2 between the catcher 1 located at the most upstream side and the shore is set to be equal to or less than 1/2 of the set driftwood length. ing. Further, an interval L5 in the flow direction D1 between the pillar 3 of the capturing body 1 located at the most upstream side and the sleeve 9 of the dam 2 is set to be equal to or longer than the set driftwood length.

  In addition, in the method of installing the capturing body according to the second embodiment, the capturing body 1 located at the most downstream side is installed in the water-permeable portion 8 of the dam 2, but is spaced apart from the water-permeable portion 8 on the upstream side. May be installed. Moreover, you may install so that the adjacent capture bodies 1 and 1 may not overlap in the flow direction D1. Some of the capturing bodies 1 may be installed at positions overlapping each other in the transverse direction D2, as in the modification of the first embodiment. Further, the capturing body 1 may have a configuration in which the crosspiece member 4 and the support portion 5 are omitted and two or more pillar portions 3 are arranged at intervals in the transverse direction D2.

  In the method for installing the catcher of the second embodiment, the interval L4 in the transverse direction D2 between the catcher 1 installed on the most upstream side and the shore is set to be equal to or less than 1/2 of the set driftwood length. Therefore, the distance between the capturing body 1 closest to the shore and the shore is small. For this reason, driftwood flowing from the upstream does not easily pass downstream from between the capturing body 1 closest to the shore and the shore. Moreover, the distance L1 between the adjacent capturing bodies 1 is set to an interval of 1/3 to 1/2 of the set driftwood length. Therefore, it is possible to secure a water path while obtaining the effect of capturing driftwood. Therefore, even if the distance L5 in the flow direction D1 between the most upstream capturing body 1 and the dam 2 is set to be equal to or longer than the set driftwood length, the driftwood may flow downstream of the dam 2. Can be suppressed.

(Third embodiment)
Next, a method for installing the capturing body according to the third embodiment will be described. Hereinafter, in the third embodiment, elements corresponding to those in the first embodiment will be denoted by the same reference numerals as those in the first embodiment, and the description thereof will be omitted.

  In the method for installing the capturing bodies according to the third embodiment, the plurality of capturing bodies 1 are installed so as to be inclined in one direction with respect to the flow direction D1 and are spaced apart from each other so as to be arranged in an oblique straight line. In the example of FIG. 6, the plurality of capturing bodies 1 are obliquely linear from the capturing body 1 installed at a position closest to the rightmost bank to the capturing body 1 installed at the most downstream side and near the left bank. It is installed to line up. The capturing body 1 located at the most downstream side is arranged at a position overlapping the sleeve 9 of the bank 2 in the flow direction D1. An interval L2 in the flow direction D1 between the pillar 3 and the sleeve 9 of the capturing body 1 located at the most downstream side is 1/3 to 1/2 of the set driftwood length as in the first embodiment. Is set to the interval. An interval L6 in the flow direction D1 between the capturing body 1 installed on the most upstream side and the sleeve 9 of the bank 2 is set to be equal to or longer than the set driftwood length, as in the second embodiment. An interval L4 in the transverse direction D2 between the capturing body 1 installed on the most upstream side and the shore is set to an interval equal to or less than 1/2 of the set driftwood length, as in the second embodiment.

  Note that the plurality of capturing bodies 1 are arranged in a diagonal straight line from the capturing body 1 installed at a position closest to the left bank to the capturing body 1 installed farthest downstream and near the right bank. It may be installed. Moreover, you may install so that the adjacent capture bodies 1 and 1 may not overlap in the flow direction D1. Some of the capturing bodies 1 may be installed at positions overlapping each other in the transverse direction D2, as in the modification of the first embodiment. Further, the capturing body 1 may have a configuration in which the crosspiece member 4 and the support portion 5 are omitted and two or more pillar portions 3 are arranged at intervals in the transverse direction D2.

  In the method for installing the catcher of the third embodiment, the distance L4 in the transverse direction D2 between the catcher 1 installed on the most upstream side and the shore is set to be equal to or less than 1/2 of the set driftwood length. Therefore, the distance between the capturing body 1 closest to the shore and the shore is narrow. Therefore, it is difficult for driftwood flowing from the upstream to pass downstream between the capturing body 1 closest to the shore and the shore. In addition, the interval L1 in the flow direction D1 between the adjacent capturing bodies 1 is set to an interval of 1/3 to 1/2 of the set driftwood length. Therefore, it is possible to secure a water path while obtaining the effect of capturing driftwood. Therefore, even if the distance L6 in the flow direction D1 between the most upstream capturing body 1 and the dam 2 is set to be equal to or longer than the set driftwood length, the driftwood may flow downstream of the dam 2. Can be suppressed.

(Fourth embodiment)
Next, a method for installing the capturing body according to the fourth embodiment will be described. Hereinafter, in the fourth embodiment, components corresponding to those in the first embodiment are denoted by the same reference numerals as in the first embodiment, and description thereof will be omitted.

  In the method for installing a capturing body according to the fourth embodiment, as shown in FIG. 7, a plurality of capturing bodies 1 are installed so as to be arranged in a W-shape at intervals from each other in a direction inclined with respect to the flow direction D1. Go.

  In the example of FIG. 7, three capturing bodies 1 located at the most downstream side are set as the first row, and three are installed at intervals in the transverse direction D2. The two capturing bodies 1 are arranged in a second row with an interval L1 in the transverse direction D2. When the river width is wide, for example, a plurality of capturing bodies 1 are installed so as to be continuous in the transverse direction D2 such that the first row and the second row are alternately arranged.

  Note that the number of the capturing bodies 1 installed in the first and second rows is not limited to three and two, respectively. The number of the capturing bodies 1 installed in the first row and the second row may be opposite, or may be one or two.

  In addition, in the method of installing the capturing bodies according to the fourth embodiment, if the plurality of capturing bodies 1 are arranged so as to be arranged in a W shape, the plurality of capturing bodies 1 are installed so as to be arranged in three or more rows in the flow direction D1. You may. In this case, when the distance in the flow direction D1 between the pillar 3 of the capturing body 1 closest to the shore and the sleeve 9 of the dam 2 is set to be equal to or longer than the set driftwood length, The distance between the catcher 1 and the shore in the transverse direction D2 is set to be equal to or less than 1/2 of the set driftwood length.

  Moreover, you may install so that the adjacent capture bodies 1 and 1 may not overlap in the flow direction D1. Some of the capturing bodies 1 may be installed at positions overlapping each other in the transverse direction D2, as in the modification of the first embodiment. Further, the capturing body 1 may have a configuration in which the horizontal rail member 4 and the support portion 5 are omitted, and two or more pillar portions 3 are arranged at intervals in the transverse direction D2.

  In the method of installing the capturing body according to the fourth embodiment, the transverse direction D2 can be obtained without increasing the interval in the flow direction D1 between the capturing body 1 located on the most upstream side and the capturing body 1 located on the most downstream side. The distance in the transverse direction D2 between the capture bodies 1 and 1 located at both ends of the dam 2 can be increased, so that, for example, when an installation such as a bridge exists on the upstream side of the dam 2, it does not come into contact with the installation. It is easy to install a plurality of capturing bodies 1 on a vehicle.

(Other modifications)
In each of the above embodiments, three or more capturing bodies 1 are arranged at intervals in the direction inclined with respect to the flow direction D1, but at least two capturing bodies 1 are inclined with respect to the flow direction D1. It suffices if they are installed at intervals in the direction.

  In each of the above embodiments, the capturing body 1 is stabilized on the riverbed by placing the concrete block 7 on the base 6 of the capturing body 1 placed on the riverbed. The trapping body 1 may be stabilized on the riverbed by placing a substance containing soil and the like on the base portion 6 of the trapping body 1. Alternatively, the capturing body 1 may be stabilized on the riverbed by placing concrete on the riverbed and fixing the base portion 6 to the cast concrete. Note that soil cement may be used instead of concrete.

DESCRIPTION OF SYMBOLS 1 Capture body 2 Impermeable type sabo dam L1 interval L2 interval L4 interval L6 interval

Claims (3)

A method of installing a capturing body that installs a capturing body that captures driftwood flowing from an upstream of a river on an upstream side of an impermeable type sabo dam,
Most so as to approach the both sides toward the downstream side upstream the catching member located in the as the vertex, installing multiple captor at intervals in a direction inclined with respect to the flow direction of the river, captor Installation method. An interval in the flow direction of the river between the adjacent capturing body and the capturing body is set to an interval of 1/3 to 1/2 of the set driftwood length,
A method for installing the capturing body according to claim 1. A method of installing a capturing body that installs a capturing body that captures driftwood flowing from an upstream of a river on an upstream side of an impermeable type sabo dam,
An interval in the flow direction of the river between the adjacent capturing body and the capturing body is set to an interval of 1/3 to 1/2 of a set driftwood length,
A plurality of capturing bodies are installed at intervals from each other so as to incline in one direction with respect to the flow direction of the river,
An interval in the flow direction of the river between the trapping body and the impervious type sabo dam installed on the most upstream side is set to an interval equal to or longer than the set driftwood length,
Set to 1/2 or less of the distance between the spacing of transverse the set driftwood length perpendicular to the flow direction of the river between the most the installed upstream captor and shore installation captor Method.

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