JP7360777B2 - Installation structure of driftwood trap - Google Patents

Installation structure of driftwood trap Download PDF

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JP7360777B2
JP7360777B2 JP2022186516A JP2022186516A JP7360777B2 JP 7360777 B2 JP7360777 B2 JP 7360777B2 JP 2022186516 A JP2022186516 A JP 2022186516A JP 2022186516 A JP2022186516 A JP 2022186516A JP 7360777 B2 JP7360777 B2 JP 7360777B2
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driftwood
trap
installation structure
steel
dam
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ひろし 國領
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Nippon Steel Metal Products Co Ltd
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Description

この発明は、砂防、治山等の目的で河川の横断方向に構築される堰堤（以下、「砂防堰堤」と総称する。）に対し、その上流側に鋼製柱部材等からなる流木捕捉工を設置する構造の技術分野に属する。
なお、前記砂防堰堤は、既設、新設を問わない。また、砂防堰堤上流側の満砂、未満砂状態も問わない。 This invention provides for a dam (hereinafter collectively referred to as "sabo dam") constructed in the transverse direction of a river for the purpose of erosion control, forest conservation, etc., to have a driftwood trapping structure made of steel pillar members, etc. on the upstream side of the dam. It belongs to the technical field of the structure to be installed.
The sabo dam may be existing or newly constructed. Also, it does not matter whether the upstream side of the erosion control dam is full of sand or less than sand.

近年、前記砂防堰堤について、下流側での災害をより効率よく防止するべく、当該砂防堰堤に流木捕捉機能を付加するように改良する要請がある。
前記したような砂防堰堤に流木捕捉機能を付加する手段は、砂防堰堤に対して切欠き又は嵩上げする等の大掛かりな作業が必要になる課題が指摘されていたが、例えば特許文献１、２に示すように、今年になって、前記大掛かりな作業を必要とすることなく砂防堰堤に流木捕捉工を導入できる技術が開示されている。 In recent years, there has been a demand to improve the erosion control dam by adding a driftwood trapping function to the erosion control dam in order to more efficiently prevent disasters on the downstream side.
It has been pointed out that the means for adding a driftwood trapping function to the sabo dam as described above requires large-scale work such as cutting out or raising the height of the sabo dam. As shown, a technology has been disclosed this year that allows the introduction of driftwood traps into sabo dams without requiring the above-mentioned large-scale work.

前記特許文献１には、流水を通す水通し部を有し、上流側に土砂が堆積した堰堤の近傍に河川の上流から流れてくる流木を捕捉する捕捉体を河川の掃流区間に設置する捕捉体の設置方法であって、河川の流れ方向に沿った前記水通し部から前記捕捉体までの距離をＬ１、流木長をＬ、移動限界粒径をＤとしたときに、２×Ｄ≦Ｌ１≦１／２×Ｌの数式の関係を満たすように、前記捕捉体を前記水通し部の開口面全域に対向する位置で前記堰堤の上流側に堆積した土砂に設置することを特徴とする捕捉体の設置方法が開示されている（請求項１、及び図１、図２の記載等を参照）。 According to Patent Document 1, a trapping body that has a water passage section for passing running water and that traps driftwood flowing from the upstream side of a river is installed in a sweep section of a river near a dam where sediment is deposited on the upstream side. A method for installing a trapping body, where L1 is the distance from the water passage part to the trapping body along the flow direction of the river, L is the driftwood length, and D is the migration limit particle size, 2×D≦ The trapping body is installed in the earth and sand accumulated on the upstream side of the dam at a position facing the entire opening surface of the water passage part so as to satisfy the mathematical relationship of L1≦1/2×L. A method for installing a capture body is disclosed (see claim 1 and the descriptions of FIGS. 1 and 2, etc.).

前記特許文献２には、既設の不透過型砂防堰堤に流木捕捉工を設けて改良する砂防堰堤改良構造であって、鋼管柱材と鋼管梁材とを縦横に接合してなる流木捕捉部材を、前記砂防堰堤の両袖部からそれぞれ上流側へ突き出した繋ぎ材と接合することにより、当該流木捕捉部材が前記砂防堰堤から上流側へ張り出して設けられてなることを特徴とする砂防堰堤改良構造が開示されている（請求項１、及び図１～図３の記載等を参照）。 Patent Document 2 discloses a sabo dam improvement structure in which an existing impermeable sabo dam is improved by providing a driftwood trapping structure, and the driftwood trapping member is made by vertically and horizontally joining steel pipe columns and steel pipe beams. , a sabo dam improvement structure characterized in that the driftwood trapping member is provided to extend upstream from the sabo dam by joining with connecting members that respectively protrude from both sleeves of the sabo dam to the upstream side. is disclosed (see claim 1 and the descriptions in FIGS. 1 to 3).

前記特許文献１、２の［発明の効果］の項によれば、砂防堰堤に対して切欠き又は嵩上げする等の大掛かりな作業を必要とすることなく流木捕捉体を設置できるので、施工性、経済性に優れている旨の記載が認められる。 According to the [Effects of the Invention] section of Patent Documents 1 and 2, the driftwood trap can be installed without requiring large-scale work such as notching or raising the level of the erosion control dam, which improves workability. The statement that it is economically efficient is accepted.

特開２０１７－７２０２０号公報JP2017-72020A 特開２０１７－１０１５０７号公報Japanese Patent Application Publication No. 2017-101507

しかしながら、前記特許文献１、２に係る技術はともに、同文献１、２の各図面から明らかなように、流木捕捉工（捕捉体３等、流木捕捉部材３）をコンクリート製の基礎（基礎部３３等、コンクリート基礎９）に設置することを必須の構成要件としている。
よって、コンクリートを打設するための手間やコストが掛かり、加えて満砂状態の砂防堰堤では堆積土の掘削（コンクリート基礎部の床掘）作業のための手間やコストも掛かるので、仮にコンクリート基礎を用いないで流木捕捉工を実現することができれば、必然的に前記した手間やコストがなくなり、施工性、経済性が向上することは明らかである。 However, as is clear from the respective drawings of Patent Documents 1 and 2, the techniques according to Patent Documents 1 and 2 do not allow the driftwood trapping work (the trapping body 3, etc., the driftwood trapping member 3) to be attached to a concrete foundation (foundation part 33 etc., it is an essential component that it must be installed on a concrete foundation9).
Therefore, it takes time and cost to place concrete, and in addition, if the sabo dam is full of sand, it also takes time and cost to excavate the piled soil (excavating the floor of the concrete foundation). It is clear that if a driftwood trapping system can be realized without using a driftwood trap, the above-mentioned labor and cost will inevitably be eliminated, and construction efficiency and economic efficiency will be improved.

その他、前記特許文献１に係る技術においては、捕捉体を支持しているのはコンクリート製の基礎部だけなので、堆砂上で設置する場合においては基礎（構造物）の支持力が不足することによる沈下、転倒、流出等が懸念される。さらに、未満砂状態の砂防堰堤では、必要となる捕捉体高さが高くなり不経済となる。 In addition, in the technology according to Patent Document 1, only the concrete foundation supports the trapping body, so when installing on sediment, the supporting force of the foundation (structure) is insufficient. There are concerns about subsidence, overturning, spillage, etc. Furthermore, in the case of sabo dams that are less than sandy, the required height of the trapping body becomes high, making it uneconomical.

したがって、本発明は、上述した背景技術の課題に鑑みて案出されたものであり、その目的とするところは、前記砂防堰堤を切欠き又は嵩上げする等の大掛かりな作業の必要性がないことはもとより、流木捕捉工を砂防堰堤だけで片持ち状態で支持可能な構造を実現することにより、コンクリート基礎を無用化し、施工性、経済性、及び安定性に優れた流木捕捉工の設置構造を提供することにある。 Therefore, the present invention has been devised in view of the problems of the background art described above, and its purpose is to eliminate the need for large-scale work such as notching or raising the sabo dam. In addition, by realizing a structure that can support the driftwood trap in a cantilevered state using only the erosion control dam, we have eliminated the need for a concrete foundation and created an installation structure for the driftwood trap that is easy to construct, economical, and stable. It is about providing.

上記課題を解決するための手段として、請求項１に記載した発明に係る流木捕捉工の設置構造は、砂防堰堤に対する流木捕捉工の設置構造であって、複数の鋼製柱部材がそれぞれ、前記砂防堰堤の上流側側面部から上流側へ突き出した土台部材を介して片持ち状態で張り出して設けられて成ることを特徴とする。 As a means for solving the above problem, an installation structure for a driftwood trap according to the invention as set forth in claim 1 is an installation structure for a driftwood trap on an erosion control dam, wherein a plurality of steel column members each have a It is characterized in that it is provided in a cantilevered manner extending from the upstream side surface of the erosion control dam via a base member that projects upstream.

請求項２に記載した発明は、請求項１に記載した流木捕捉工の設置構造において、前記複数の鋼製柱部材は、互いの間隔が、想定される最大流木長の１／２以下に設定されていることを特徴とする。 The invention described in claim 2 is the installation structure of the driftwood trap described in claim 1, in which the plurality of steel column members are set at intervals of 1/2 or less of the assumed maximum driftwood length. It is characterized by being

請求項３に記載した発明は、請求項１又は２に記載した流木捕捉工の設置構造において、前記砂防堰堤の水通し部の上流側正面方向に２以上の鋼製柱部材が配置されるように構成されていることを特徴とする。 The invention described in claim 3 is the installation structure of the driftwood trap described in claim 1 or 2, in which two or more steel column members are arranged in the upstream front direction of the water passage part of the sabo dam. It is characterized by being configured as follows.

請求項４に記載した発明は、請求項１～３のいずれか１項に記載した流木捕捉工の設置構造において、前記砂防堰堤の両袖部の上流側正面方向にそれぞれ２以上の鋼製柱部材が配置されるように構成されていることを特徴とする。 The invention described in claim 4 is the installation structure of the driftwood trap described in any one of claims 1 to 3, in which two or more steel columns are provided in the upstream front direction of both sleeves of the sabo dam. It is characterized by being configured such that the members are arranged.

請求項５に記載した発明に係る流木捕捉工の設置構造は、砂防堰堤に対する流木捕捉工の設置構造であって、鋼製柱材と鋼製梁材とを縦横に接合して一体化されてなる流木捕捉体が、前記砂防堰堤の両袖部からそれぞれ上流側へ突き出した左右の支持部材を介して片持ち状態で張り出して設けられて成ることを特徴とする。 The installation structure of a driftwood trap according to the invention described in claim 5 is an installation structure of a driftwood trap for an erosion control dam, and is an installation structure in which steel columns and steel beams are joined vertically and horizontally to be integrated. The driftwood traps are provided in a cantilevered manner and protrude from both sleeves of the sabo dam via left and right support members that respectively protrude toward the upstream side.

請求項６に記載した発明は、請求項５に記載した流木捕捉工の設置構造において、前記流木捕捉体の鋼製柱材は、互いの間隔が、想定される最大流木長の１／２以下に設定されていることを特徴とする。 The invention described in claim 6 is the installation structure of the driftwood trap described in claim 5, in which the steel pillars of the driftwood trap are spaced apart from each other by 1/2 or less of the assumed maximum driftwood length. It is characterized by being set to .

請求項７に記載した発明は、請求項５又は６に記載した流木捕捉工の設置構造において、前記流木捕捉体の鋼製柱材は、前記流木捕捉体は、砂防堰堤の水通し部の上流側正面方向に鋼製柱材が２本以上配置されるように構成されていることを特徴とする。 The invention described in claim 7 is the installation structure of the driftwood trapping work described in claim 5 or 6, in which the steel column material of the driftwood trap is located upstream of the water passage part of the erosion control dam. It is characterized by being configured so that two or more steel pillars are arranged in the side front direction.

請求項８に記載した発明は、請求項５～７のいずれか１項に記載した流木捕捉工の設置構造において、前記流木捕捉体の鋼製柱材及び／又は鋼製梁材は、砂防堰堤本体の上流側側面部から上流側へ突設された土台部材で支持されていることを特徴とする。 The invention described in claim 8 is the installation structure of the driftwood trapping structure described in any one of claims 5 to 7, in which the steel column material and/or the steel beam material of the driftwood trapping body is installed on an erosion control dam. It is characterized in that it is supported by a base member that projects upstream from the upstream side surface of the main body.

請求項９に記載した発明は、請求項１～８のいずれか１項に記載した流木捕捉工の設置構造において、前記土台部材及び支持部材は、砂防堰堤本体にアンカーで固定されていることを特徴とする。 The invention described in claim 9 is the installation structure of the driftwood trap described in any one of claims 1 to 8, wherein the foundation member and the support member are fixed to the erosion control dam body with an anchor. Features.

本発明に係る流木捕捉工の設置構造によれば、砂防堰堤を切欠き又は嵩上げする等の大掛かりな作業の必要性がないことはもとより、流木捕捉工を砂防堰堤だけで片持ち状態で支持可能な構造を実現できるので、コンクリート基礎を無用化でき、施工性、経済性、及び安定性に優れた流木捕捉工の設置構造を実現することができる。
具体的には、前記砂防堰堤を切欠き又は嵩上げする等の大掛かりな作業を省略して実現できるので、施工性、経済性に非常に優れている。また、前記流木捕捉工が、前記砂防堰堤から上流側へ片持ち状態で張り出した構成で実施するので、水通し部を閉塞させることなく流木等の流下物を効果的に捕捉することが可能となる。さらに、新設だけでなく、既設の未満砂状態でも流木捕捉工を設置することが可能となる。
流木等の流下物を砂防堰堤の面外方向へ張り出した流木捕捉工で捕捉する構成なので、流木捕捉後の除木作業においては、砂防堰堤の両袖部の存在が邪魔にならないオープンスペースでの作業を実現できる。よって、作業効率性に優れる。
前記砂防堰堤が満砂状態の場合に従来必須であったコンクリート基礎を構築するための土砂浚渫作業は一切必要としないので、作業性、経済性に非常に優れている。
その他、前記流木捕捉工の要所はフランジ接合で実施しているので、交換時の脱着作業や維持管理が容易である等、メンテナンス性にも非常に優れている。 According to the installation structure of the driftwood trapping structure according to the present invention, there is no need for major work such as notching or raising the erosion control dam, and the driftwood trapping structure can be supported in a cantilevered state by the erosion control dam alone. Since a concrete foundation can be realized, a concrete foundation can be made unnecessary, and a driftwood trap installation structure with excellent workability, economy, and stability can be realized.
Specifically, it can be realized without major work such as notching or raising the sabo dam, so it is extremely easy to construct and economically efficient. Furthermore, since the driftwood trapping structure is constructed so as to extend in a cantilevered manner toward the upstream side from the erosion control dam, it is possible to effectively catch falling objects such as driftwood without clogging the water passage. Become. Furthermore, it becomes possible to install driftwood traps not only in new constructions but also in existing constructions that are under sandy conditions.
Since the structure is such that driftwood and other debris are captured by a driftwood trap that extends out of the surface of the sabo dam, the removal work after catching the driftwood can be carried out in an open space where the presence of both sides of the sabo dam will not interfere. Can accomplish the task. Therefore, work efficiency is excellent.
Since there is no need for any earth and sand dredging work to construct a concrete foundation, which was conventionally required when the sabo dam is full of sand, it is extremely efficient and economical.
In addition, since important parts of the driftwood trapping work are carried out by flange joints, it is very easy to maintain, such as easy attachment/detachment work during replacement and easy maintenance.

Ａは、本発明に係る流木捕捉工の設置構造の実施例１を示した側面図であり、Ｂは、同下流側からみた正面図であり、Ｃは、同平面図である。A is a side view showing Example 1 of the installation structure of a driftwood trap according to the present invention, B is a front view of the same as seen from the downstream side, and C is a plan view of the same. Ａは、本発明に係る流木捕捉工の設置構造の実施例２を示した側面図であり、Ｂは、同下流側からみた正面図であり、Ｃは、同平面図である。A is a side view showing Example 2 of the installation structure for a driftwood trap according to the present invention, B is a front view of the same as seen from the downstream side, and C is a plan view of the same. Ａは、本発明に係る流木捕捉工の設置構造の実施例３を示した側面図であり、Ｂは、同下流側からみた正面図であり、Ｃは、同平面図である。A is a side view showing Example 3 of the installation structure for a driftwood trap according to the present invention, B is a front view of the same as seen from the downstream side, and C is a plan view of the same. Ａは、本発明に係る流木捕捉工の設置構造の実施例４を示した側面図であり、Ｂは、同下流側からみた正面図であり、Ｃは、同平面図である。A is a side view showing Example 4 of the installation structure for a driftwood trap according to the present invention, B is a front view of the same as seen from the downstream side, and C is a plan view of the same. Ａは、本発明に係る流木捕捉工の設置構造の実施例５を示した下流側からみた正面図であり、Ｂは、ＡのＢ－Ｂ線矢視断面図であり、Ｃは、Ａの平面図である。A is a front view of Example 5 of the installation structure for a driftwood trap according to the present invention as seen from the downstream side, B is a cross-sectional view of A taken along line BB, and C is a cross-sectional view of A as viewed from the line B-B. FIG.

次に、本発明に係る流木捕捉工の設置構造の実施例を図面に基づいて説明する。 Next, an example of an installation structure for a driftwood trapping device according to the present invention will be described based on the drawings.

図１Ａ～Ｃは、実施例１に係る流木捕捉工の設置構造を示している。
図示例に係る流木捕捉工１の設置構造は、砂防堰堤１０に対する流木捕捉工１の設置構造であって、複数の鋼製柱部材２がそれぞれ、前記砂防堰堤の上流側側面部から上流側へ突き出した土台部材３を介して片持ち状態で張り出して設けられて構成されている。
すなわち、本発明に係る流木捕捉工１の設置構造は、当該流木捕捉工１を支持するためのコンクリート基礎が（存在し）ない構成を大きな特徴としている。 1A to 1C show an installation structure of a driftwood trap according to a first embodiment.
The installation structure of the driftwood trap 1 according to the illustrated example is an installation structure of the driftwood trap 1 with respect to the erosion control dam 10, in which a plurality of steel column members 2 are respectively installed from the upstream side surface of the erosion control dam to the upstream side. It is constructed so as to extend in a cantilevered manner via a protruding base member 3.
That is, the installation structure of the driftwood trap 1 according to the present invention is characterized by the absence of a concrete foundation for supporting the driftwood trap 1.

前記鋼製柱部材２は、前記土台部材３で片持ち状態で支持可能な構成、さらにいえば、当該鋼製柱部材２と土台部材３とからなる流木捕捉工１が、全体で、流木等の流下物を捕捉可能なスリットを形成できることを条件に、図示例にかかわらず自在な形態に適宜設計変更して実施できる。 The steel column member 2 has a structure that can be supported in a cantilever state by the base member 3, and more specifically, the driftwood trap 1 consisting of the steel column member 2 and the base member 3 can be used as a whole to catch driftwood, etc. Regardless of the illustrated example, the design can be modified and implemented as appropriate, provided that a slit capable of catching falling objects can be formed.

図示例に係る鋼製柱部材２は、あくまでも一例として、流木捕捉支柱（上流側鉛直材）２ａと、上流側へ前傾させた下流側支え支柱（斜材）２ｂとが頭部同士を溶接により一体化されて河川の流れ方向に開脚する倒立レの字状に形成されている。一方、土台部材３は、前記流木捕捉支柱２ａおよび下流側支え支柱２ｂの各下端部と同軸上に接合する２つの突出端部を備えた水平材３ａと、方杖材（斜材）３ｂとが一端部同士を溶接により一体化して形成されている。そして、前記鋼製柱部材２の流木捕捉支柱２ａおよびと下流側支え支柱２ｂと、前記水平材３ａの２つの突出端部とがフランジ接合６、７され、当該水平材３ａおよび方杖材３ｂの他端部（基端部）に設けられた共通のベースプレート４を介してアンカーボルト５により砂防堰堤１０の上流側側面部に固定されることにより、前記流木捕捉工１の構成部材が構築される。
ちなみに図中の符号１１は、水通し部、符号１１ａは、水通し部１１の両端部を構成する袖小口、符号１２は、袖部を示している。 In the steel column member 2 according to the illustrated example, the heads are welded to each other, with a driftwood capture column (upstream vertical member) 2a and a downstream support column (diagonal member) 2b tilted forward toward the upstream side. It is integrated into an inverted V-shape that opens in the direction of the river flow. On the other hand, the base member 3 includes a horizontal member 3a having two protruding ends coaxially connected to the lower ends of the driftwood capturing column 2a and the downstream support column 2b, and a diagonal member 3b. The two ends are integrally formed by welding together. Then, the driftwood catching strut 2a and the downstream support strut 2b of the steel column member 2 and the two protruding ends of the horizontal member 3a are flange-jointed 6, 7, and the horizontal member 3a and the cane member 3b are joined by flanges 6, 7. The constituent members of the driftwood trap 1 are constructed by being fixed to the upstream side surface of the erosion control dam 10 with anchor bolts 5 via a common base plate 4 provided at the other end (base end). Ru.
Incidentally, the reference numeral 11 in the figure indicates a water passage portion, the reference numeral 11a indicates a sleeve edge constituting both ends of the water passage portion 11, and the reference numeral 12 indicates a sleeve portion.

本実施例では、上述した構成の鋼製柱部材２及び土台部材３と同形・同大のものを３つ用意し、前記砂防堰堤１０の水通し部１１の領域内にバランスよく等間隔に、側面方向から見て一致するように設置して流木捕捉工１を構築している。前記等間隔とは、本実施例では想定される最大流木長が５ｍ程度であることを勘案し、その１／２の２．５ｍ程度に設定して実施している。 In this embodiment, three pieces of the same shape and size as the steel column members 2 and base members 3 having the above-mentioned configuration are prepared, and they are placed at equal intervals in a well-balanced manner within the area of the water passage part 11 of the erosion control dam 10. Driftwood trap 1 is constructed by installing them so that they match when viewed from the side. The above-mentioned equal intervals are set to 1/2 of that length, about 2.5 m, in consideration of the assumed maximum length of driftwood being about 5 m in this embodiment.

なお、前記鋼製柱部材２の高さは、その天端を砂防堰堤１０の袖天端に揃えた２．５ｍ程度で実施されている。使用する鋼管はすべて、一例として、外径（φ）３１８．５ｍｍ、肉厚１０．３のＳＴＫ４９０が好適に用いられている。
また、前記鋼製柱部材２は、前記砂防堰堤１０との距離を、想定される最大流木長を基準に設定（決定）されている。ちなみに本実施例では、最大流木長を５ｍ程度と想定し、前記流木捕捉支柱２ａの軸芯（ダム軸）と前記砂防堰堤１０（の上流側側面部）との距離を、２．５ｍに設定して実施している。
ちなみに、前記鋼製柱部材２の前記ダム軸に鉛直な流木捕捉支柱２ａを用いている意義の１つとして、砂防堰堤１０の袖部１２の上流側が側面視鉛直形状（図１Ａ参照）であることに合致させ、略平行配置とすることにより流木等の流下物を効果的に捕捉することが挙げられる。よって、仮に、前記袖部１２の上流側を側面視傾斜形状で実施する場合は、前記鉛直な流木捕捉支柱２ａに代えて、同袖部１２と略平行な配置を実現する下流側へ前傾させた流木捕捉支柱を用いることが好ましい。 The height of the steel column member 2 is approximately 2.5 m, with its top end aligned with the top end of the sleeve of the sabo dam 10. For all the steel pipes used, for example, STK490 having an outer diameter (φ) of 318.5 mm and a wall thickness of 10.3 mm is preferably 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. Incidentally, in this embodiment, the maximum length of driftwood is assumed to be approximately 5 m, and the distance between the axis (dam axis) of the driftwood capture strut 2a and (the upstream side surface of) the sabo dam 10 is set to 2.5 m. We are implementing the following measures.
Incidentally, one of the reasons for using the driftwood trapping strut 2a that is perpendicular to the dam axis of the steel column member 2 is that the upstream side of the sleeve portion 12 of the erosion control dam 10 has a vertical shape in side view (see FIG. 1A). By arranging them substantially parallel to each other, it is possible to effectively catch falling objects such as driftwood. Therefore, if the upstream side of the sleeve section 12 is to have an inclined shape when viewed from the side, instead of the vertical driftwood capturing support 2a, a structure that is tilted forward toward the downstream side to achieve an arrangement substantially parallel to the sleeve section 12 may be used. It is preferable to use a driftwood capture post that has a vertical structure.

前記鋼製柱部材２及び前記土台部材３（流木捕捉工１）の使用本数、大きさは勿論上記に限定されず、想定される最大流木長はもとより、前記砂防堰堤１０の規模、水通し部１１の幅寸、洪水時の河川の性状（想定水位、想定流量、流木の流下幅）、および画像解析による流木の捕捉シミュレーション等を基に、適宜設計変更可能である。
特に、前記土台部材３は、方杖材３ｂを用いる等、前記鋼製柱部材２を片持ち状態でも十分に支持可能な強度・剛性を備えた構造で実施することに留意する。
ちなみに、前記鋼製柱部材２の高さは本実施例では２．５ｍ程度で実施しているが、想定される捕捉流木量、流木捕捉による堰上げ水深に応じ、１～５ｍの範囲で適宜設計変更可能である。使用する鋼管径（φ）は２０～５０ｃｍ程度、鋼管肉厚は８～１６ｍｍ程度の範囲内が好ましい。
本実施例に係る水通し部１１の底幅寸は５ｍ程度、袖小口の幅寸は各１ｍ弱程度で実施されている。 The number and size of the steel column members 2 and the base members 3 (driftwood trapping structure 1) are not limited to the above, and may vary depending on the expected maximum driftwood length, the scale of the erosion control dam 10, and the water passage area. The design can be changed as appropriate based on the width dimension of 11, the characteristics of the river at the time of flood (estimated water level, estimated flow rate, drift width of driftwood), and driftwood capture simulation based on image analysis.
In particular, it is noted that the base member 3 has a structure having sufficient strength and rigidity to support the steel column member 2 even in a cantilevered state, such as by using a cane member 3b.
Incidentally, the height of the steel column member 2 is set at about 2.5 m in this example, but it can be adjusted as appropriate in the range of 1 to 5 m depending on the expected amount of captured driftwood and the depth of water raised by the weir due to the driftwood capture. Design changes are possible. The diameter (φ) of the steel pipe used is preferably about 20 to 50 cm, and the wall thickness of the steel pipe is preferably about 8 to 16 mm.
The bottom width of the water passage part 11 according to this embodiment is about 5 m, and the width of each sleeve edge is about 1 m.

したがって、本実施例１に係る流木捕捉工の設置構造によれば、砂防堰堤１０を切欠き又は嵩上げする等の大掛かりな作業の必要性がないことはもとより、流木捕捉工１を砂防堰堤１０だけで片持ち状態で支持可能な構造を実現できるので、コンクリート基礎を無用化でき、施工性、経済性、及び安定性に優れた流木捕捉工の設置構造を実現できる。
特には、前記流木捕捉工１が、前記砂防堰堤１０から上流側へ片持ち状態で張り出した構成で実施するので、水通し部１１を閉塞させることなく流木等の流下物を効果的に捕捉することが可能となる。
具体的に説明すると、前記流木捕捉工１が、水通し部１１（底幅５ｍ程度）側の前方（上流側正面方向）に最大流木長の１／２以下である２．５ｍの張り出した位置に３つの鋼製柱部材２（特には流木捕捉支柱２ａ）が左右にバランスよく２．５ｍの間隔をあけて、土台部材３によって片持ち状態で立ち上がる構造で実施されている。
よって、河川を流下する流木等の流下物は、想定される最大流木長の１／２以下の間隔（２．５ｍ）に設置した前記鋼製柱部材２、ひいては流木捕捉工１によって確実に捕捉でき、当該流木捕捉工１の背後（後方）に回り込もうとする流木等の流下物は、流木捕捉工１の鋼製柱部材２及び土台部材３（特には下流側支え支柱２ｂ）によって確実に捕捉でき、もって、流木等の流下物の下流側への流出を効果的に防止することができる。 Therefore, according to the installation structure of the driftwood trapping structure according to the first embodiment, not only is there no need for large-scale work such as notching or raising the erosion control dam 10, but also the driftwood trapping structure 1 can be installed only at the erosion control dam 10. Since it is possible to realize a structure that can be supported in a cantilevered state, a concrete foundation can be made unnecessary, and an installation structure for a driftwood trap that is excellent in workability, economy, and stability can be realized.
In particular, since the driftwood trap 1 is configured to extend in a cantilevered manner toward the upstream side from the erosion control dam 10, it is possible to effectively catch falling objects such as driftwood without clogging the water passage 11. becomes possible.
Specifically, the driftwood trap 1 is located at a position where the driftwood trap 1 protrudes 2.5 m in front (in the upstream front direction) of the water passage section 11 (bottom width approximately 5 m), which is 1/2 or less of the maximum driftwood length. The structure is such that three steel column members 2 (particularly the driftwood trapping column 2a) are cantilevered from the base member 3 with a well-balanced interval of 2.5 m left and right.
Therefore, objects such as driftwood flowing down a river can be reliably captured by the steel column members 2 installed at intervals (2.5 m) or less of 1/2 of the expected maximum length of driftwood, and by extension by the driftwood trap 1. Driftwood and other fallen objects that try to get behind (backwards) the driftwood trap 1 can be reliably secured by the steel column members 2 and foundation members 3 (especially the downstream support column 2b) of the driftwood trap 1. Therefore, it is possible to effectively prevent falling objects such as driftwood from flowing downstream.

図２Ａ～Ｃは、実施例２に係る流木捕捉工の設置構造を示している。
この実施例２に係る流木捕捉工２０の設置構造は、上記実施例１と比し、当該流木捕捉工２０の構成部材である鋼製柱部材２（及び土台部材３）を、水通し部１１の上流側正面方向だけではなく、両袖部１２の上流側正面方向にもそれぞれ２以上（図示例では２つ）増量させた点が相違する。
よって、この実施例２に係る流木捕捉工２０の設置構造は、流木捕捉工２０を支持するためのコンクリート基礎がない構成で実施する等、上記実施例１と同様のコンセプトで実施していることに変わりはないので、やはり上記実施例１と同様の作用効果を奏する（前記段落［００２８］参照）。加えて、上記実施例１よりも流木の流下幅が広大な河川に対しても適用可能という利点もある。その他、水通し部１１近傍の両袖部１２、１２を保護する役割も果たす。 FIGS. 2A to 2C show the installation structure of a driftwood trap according to the second embodiment.
The installation structure of the driftwood trap 20 according to this second embodiment is different from that of the first embodiment, in which the steel column member 2 (and the base member 3), which is a component of the driftwood trap 20, is connected to the water passage part 11. The difference is that the amount is increased by two or more (two in the illustrated example) not only in the upstream front direction of both sleeve portions 12 but also in the upstream front direction of both sleeve portions 12.
Therefore, the installation structure of the driftwood trapping structure 20 according to this second embodiment is implemented based on the same concept as the above-mentioned example 1, such as implementing it without a concrete foundation for supporting the driftwood trapping structure 20. There is no change, so the same effect as in Example 1 is achieved (see paragraph [0028] above). In addition, there is an advantage that this embodiment can be applied to rivers where driftwood flows down a wider width than in the first embodiment. In addition, it also plays a role of protecting both sleeve parts 12, 12 near the water passage part 11.

図３Ａ～Ｃは、実施例３に係る流木捕捉工の設置構造を示している。
この実施例３に係る流木捕捉工３０の設置構造は、砂防堰堤１０に対する流木捕捉工３０の設置構造であって、鋼製柱材３１と鋼製梁材３２とを縦横に接合して一体化されてなる流木捕捉体が、前記砂防堰堤１０の両袖部１２、１２からそれぞれ上流側へ突き出した左右の支持部材３３を介して片持ち状態で張り出して設けられて構成されている。
すなわち、本発明に係る流木捕捉工３０の設置構造もまた、当該流木捕捉工３０を支持するためのコンクリート基礎が（存在し）ない構成を大きな特徴としている。 3A to 3C show the installation structure of a driftwood trap according to the third embodiment.
The installation structure of the driftwood trap 30 according to this third embodiment is an installation structure of the driftwood trap 30 on the erosion control dam 10, in which a steel column material 31 and a steel beam material 32 are joined vertically and horizontally to be integrated. The driftwood trap formed by the driftwood trap is provided in a cantilevered manner and extends from both sleeve portions 12, 12 of the sabo dam 10 via left and right support members 33, which respectively protrude toward the upstream side.
That is, the installation structure of the driftwood trap 30 according to the present invention is also characterized by the absence of a concrete foundation for supporting the driftwood trap 30.

前記流木捕捉工３０の主たる構成要素である前記流木捕捉体は、要するに、前記支持部材３３で片持ち状態で支持可能な構成、さらにいえば、当該流木捕捉体と支持部材３３とからなる流木捕捉工３０が、全体で、流木等の流下物を捕捉可能なメッシュ構造を形成できることを条件に、図示例にかかわらず自在な形態に適宜設計変更して実施できる。 In short, the driftwood trapping body, which is a main component of the driftwood trapping device 30, has a configuration that can be supported in a cantilevered state by the support member 33, and more specifically, a driftwood trapping body consisting of the driftwood trapping body and the support member 33. As long as the construction 30 as a whole can form a mesh structure capable of catching falling objects such as driftwood, the design can be appropriately changed and implemented in any form regardless of the illustrated example.

図示例にかかる流木捕捉体は、２本の鋼製柱材３１と２本の鋼製梁材３２とを、要所でフランジ接合３４により適宜継ぎ足して縦横に配置してなる構成で実施されている。ちなみに図示例では、２本の鋼製柱材３１を最大流木長の１／２である２．５ｍの間隔をあけて、前記水通し部１１の面外方向にバランスよく設けて実施している。
また、前記２本の鋼製梁材３２は、その両端部が、前記砂防堰堤１０の両袖部１２、１２から上流側正面方向に略水平に突き出した上下２段の支持部材３３と接合することにより当該砂防堰堤１０に固定されている。前記支持部材３３は、その基端部が、ベースプレート３５を前記砂防堰堤１０の上流側側面部に当てがいアンカーボルト３６を打設することにより固定され、その先端部が、前記鋼製梁材３２の両端部と溶接により接合されている。 The driftwood catcher according to the illustrated example has a structure in which two steel columns 31 and two steel beams 32 are appropriately joined by flange joints 34 at important points and arranged vertically and horizontally. There is. Incidentally, in the illustrated example, two steel pillars 31 are spaced apart by 2.5 m, which is 1/2 of the maximum driftwood length, and are provided in a well-balanced manner in the out-of-plane direction of the water passage section 11. .
Further, both ends of the two steel beam members 32 are joined to upper and lower support members 33 that protrude substantially horizontally from both sleeve portions 12, 12 of the sabo dam 10 in the upstream front direction. As a result, it is fixed to the erosion control dam 10. The base end of the support member 33 is fixed by driving the base plate 35 to the upstream side surface of the erosion control dam 10 with an anchor bolt 36, and the distal end thereof is fixed to the steel beam 32. It is joined by welding to both ends of.

前記フランジ接合３４に係る「要所」とは、損傷又は老朽化した鋼管材を容易に交換するのに適した部位、さらに言えばコンクリートを極力破砕せずに交換できる部位を指す。例えば、前記鋼製梁材３２は、前記砂防堰堤１０から突き出した支持部材３３等と切り離して交換できるようにフランジ接合されている。
かくして、前記流木捕捉体は、その両腕部（鋼製梁材２の両端部）は支持部材３３を介して前記砂防堰堤１０に強固に接合された片持ち状態の張り出し構造とされ、平面方向からみると、鋼製梁材３２と砂防堰堤１０とこれらを繋ぐ支持部材３３とで、略枠状のポケットＰを形成する構成で実施されている。 The "key point" regarding the flange joint 34 refers to a location suitable for easily replacing damaged or aged steel pipe material, and more specifically, a location that can be replaced without crushing concrete as much as possible. For example, the steel beam material 32 is flange-jointed to the supporting member 33 etc. protruding from the sabo dam 10 so that it can be separated and replaced.
Thus, the driftwood trap has a cantilever structure in which both arms (both ends of the steel beam 2) are firmly connected to the sabo dam 10 via the support member 33, and When viewed from above, the steel beam 32, the sabo dam 10, and the support member 33 connecting these components form a substantially frame-shaped pocket P.

なお、前記鋼製柱材３１の高さは、その天端を砂防堰堤１０の袖天端（図示例では袖小口肩）に揃えた２．５ｍ程度で実施されている。使用する鋼管はすべて、一例として、外径（φ）３１８．５ｍｍ、肉厚１０．３のＳＴＫ４９０が好適に用いられている。
また、前記鋼製柱材３１を備えた流木捕捉体は、前記砂防堰堤１０との距離を、想定される最大流木長を基準に設定（決定）されている。ちなみに本実施例では、最大流木長を５ｍ程度と想定し、前記鋼製柱材３１の軸芯（ダム軸）と前記砂防堰堤１０（の上流側側面部）との距離を、２．５ｍに設定して実施している。
ちなみに、前記流木捕捉体の前記鋼製柱材３１（ダム軸）を鉛直方向で実施している意義の１つとして、砂防堰堤１０の袖部１２の上流側が側面視鉛直形状（図３Ａ参照）であることに合致させ、略平行配置とすることにより流木等の流下物を効果的に捕捉することが挙げられる。よって、仮に、前記袖部１２の上流側を側面視傾斜形状で実施する場合は、同袖部１２と略平行な配置となるように、やはり前記流木捕捉体の前記鋼製柱材３１を傾斜させて実施することが好ましい。 The height of the steel pillar material 31 is approximately 2.5 m, with its top end aligned with the top end of the sleeve of the erosion control dam 10 (in the illustrated example, the shoulder of the sleeve edge). For all the steel pipes used, for example, STK490 having an outer diameter (φ) of 318.5 mm and a wall thickness of 10.3 mm is preferably used.
Further, the distance between the driftwood trapping body including the steel pillar material 31 and the sabo dam 10 is set (determined) based on the assumed maximum driftwood length. Incidentally, in this example, the maximum driftwood length is assumed to be about 5 m, and the distance between the axis of the steel column 31 (dam axis) and the sabo dam 10 (upstream side side part thereof) is set to 2.5 m. It has been set up and implemented.
Incidentally, one of the reasons why the steel pillars 31 (dam shafts) of the driftwood trapping bodies are arranged vertically is that the upstream side of the sleeve portion 12 of the erosion control dam 10 has a vertical shape in side view (see FIG. 3A). It is possible to effectively catch falling objects such as driftwood by arranging them substantially parallel to each other. Therefore, if the upstream side of the sleeve section 12 is to have an inclined shape in side view, the steel pillar material 31 of the driftwood trapping body should be inclined so that it is arranged substantially parallel to the sleeve section 12. It is preferable to carry out the process by

前記鋼製柱材３１、鋼製梁材３２、又は支持部材３３（流木捕捉工３０）の使用本数、大きさは勿論上記に限定されず、想定される最大流木長はもとより、前記砂防堰堤１０の規模、水通し部１１の幅寸、洪水時の河川の性状（想定水位、想定流量、流木の流下幅）、流木を捕捉するのに適正な間隔、および画像解析による流木の捕捉シミュレーション等を基に、適宜設計変更可能である。
特に、前記支持部材３３は、前記流木捕捉体を片持ち状態でも十分に支持可能な強度・剛性を備えた構造で実施することに留意する。
ちなみに、前記鋼製柱材３１の高さは本実施例では２．５ｍ程度で実施しているが、想定される捕捉流木量、流木捕捉による堰上げ水深に応じ、１～５ｍの範囲で適宜設計変更可能である。もっとも、前記鋼製柱材３１の頂部、及び同頂部へ接合される上段の鋼製梁材３２の高さ位置は、流木等の流下物を効果的に捕捉できるように河川の水位よりも若干高く設定されている。使用する鋼管径（φ）は２０～５０ｃｍ程度、鋼管肉厚は８～１６ｍｍ程度の範囲内が好ましい。 Of course, the number and size of the steel columns 31, steel beams 32, or support members 33 (driftwood trapping work 30) are not limited to the above, and the expected maximum driftwood length as well as the sabo dam 10 size, the width of the drainage section 11, the characteristics of the river during a flood (estimated water level, estimated flow rate, drift width of driftwood), appropriate spacing for catching driftwood, and driftwood capture simulation using image analysis, etc. Based on this, the design can be changed as appropriate.
In particular, it should be noted that the support member 33 has a structure with sufficient strength and rigidity to support the driftwood trap even in a cantilevered state.
Incidentally, the height of the steel pillar material 31 is set at about 2.5 m in this embodiment, but it can be adjusted as appropriate within the range of 1 to 5 m depending on the expected amount of captured driftwood and the depth of water raised by the weir due to the driftwood capture. Design changes are possible. However, the height position of the top of the steel column 31 and the upper steel beam 32 connected to the top is 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 (φ) of the steel pipe used is preferably about 20 to 50 cm, and the wall thickness of the steel pipe is preferably about 8 to 16 mm.

かくして、前記流木捕捉工３０の設置構造は、前記砂防堰堤１０の両袖部１２、１２にそれぞれ、上記構成のベースプレート３５を備えた支持部材３３と、鋼製梁材３２の端部を構成するＬ字状鋼管材とを接合することにより、もって、前記流木捕捉工３０の本体（中央部）を設置できる土台を構築する。
しかる後、前記流木捕捉工３０の本体を前記土台の各所のフランジへ位置決めし、対応する部位をフランジ接合３４することにより、もって、水平方向に長い略井桁状の流木捕捉工３０が前記砂防堰堤１０から上流側に片持ち状態で張り出した張り出し構造を実現することができる。 Thus, the installation structure of the driftwood trap 30 includes a support member 33 provided with the base plate 35 having the above configuration on both sleeves 12, 12 of the sabo dam 10, and an end portion of the steel beam 32. By joining the L-shaped steel pipe materials, a foundation on which the main body (center portion) of the driftwood trap 30 can be installed is constructed.
Thereafter, by positioning the main body of the driftwood trap 30 to flanges at various locations on the foundation and flange-joining the corresponding parts 34, the horizontally long, generally cross-shaped driftwood trap 30 is attached to the erosion control dam. It is possible to realize an overhanging structure that overhangs in a cantilevered manner toward the upstream side from 10.

したがって、本実施例３に係る流木捕捉工の設置構造によれば、砂防堰堤１０を切欠き又は嵩上げする等の大掛かりな作業の必要性がないことはもとより、流木捕捉工３０を砂防堰堤１０だけで片持ち状態で支持可能な構造を実現できるので、コンクリート基礎を無用化でき、施工性、経済性、及び安定性に優れた流木捕捉工の設置構造を実現できる。
特には、前記流木捕捉工３０が、前記砂防堰堤１０から上流側へ片持ち状態で張り出した構成で実施するので、水通し部１１を閉塞させることなく流木等の流下物を効果的に捕捉することが可能となる。
具体的に説明すると、前記流木捕捉工３０が、前記ポケットＰの領域を確保した上で、水通し部１１（底幅５ｍ程度）側の前方（上流側正面方向）２．５ｍの張り出した位置に２本の鋼製柱材３１が左右にバランスよく２．５ｍの間隔をあけて、支持部材３３によって片持ち状態で立ち上がる構造で実施されている。
よって、河川を流下する流木等の流下物は、想定される最大流木長の１／２の間隔（２．５ｍ）に設置した前記鋼製柱材３１、ひいては流木捕捉工３０によって確実に捕捉でき、当該流木捕捉工３０の背後（後方）に回り込もうとする流木等の流下物は、流木捕捉工３０の支持部材３３によって確実に捕捉でき、もって、流木等の流下物の下流側への流出を効果的に防止することができる。
加えて、仮に流木捕捉工３０が流木等の流下物で閉塞されても、当該閉塞部位から溢れた河川水は、前記ポケットＰの領域内へ流れ込んで水通し部１１を通過する。言うなれば、前記流木捕捉工３０がフィルターの役割を果たすので、水通し部１１が閉塞する虞はなく、安全で良好な流水を維持すること可能となる。 Therefore, according to the installation structure of the driftwood trapping structure according to the third embodiment, not only is there no need for large-scale work such as notching or raising the erosion control dam 10, but also the driftwood trapping structure 30 can be installed only on the erosion control dam 10. Since it is possible to realize a structure that can be supported in a cantilevered state, a concrete foundation can be made unnecessary, and an installation structure for a driftwood trap that is excellent in workability, economy, and stability can be realized.
In particular, since the driftwood trap 30 is configured to extend in a cantilevered manner toward the upstream side from the erosion control dam 10, it is possible to effectively catch falling objects such as driftwood without clogging the water passage section 11. becomes possible.
To be more specific, the driftwood trap 30 secures the area of the pocket P and then extends 2.5 m forward (in the upstream front direction) of the water passage section 11 (bottom width approximately 5 m). The structure is such that two steel columns 31 stand up in a cantilevered manner by supporting members 33 with a well-balanced interval of 2.5 m left and right.
Therefore, objects such as driftwood flowing down a river can be reliably captured by the steel pillars 31 installed at intervals of 1/2 of the expected maximum driftwood length (2.5 m), and by extension by the driftwood trap 30. , falling objects such as driftwood that try to go behind (backward) the driftwood trap 30 can be reliably caught by the support member 33 of the driftwood trap 30, thereby preventing the fallen objects such as driftwood from flowing downstream. Outflow can be effectively prevented.
In addition, even if the driftwood catcher 30 is blocked by falling objects such as driftwood, river water overflowing from the blockage portion flows into the region of the pocket P and passes through the water passage section 11. In other words, since the driftwood catcher 30 plays the role of a filter, there is no possibility that the water passage section 11 will be clogged, and safe and good water flow can be maintained.

図４Ａ～Ｃは、実施例４に係る流木捕捉工の設置構造を示している。
この実施例４に係る流木捕捉工４０の設置構造は、上記実施例１に対する実施例２の関係と同様に、上記実施例３と比し、砂防堰堤１０の形態に応じて、鋼製柱材３１を水通し部１１の上流側正面方向だけではなく、両袖部１２の上流側正面方向にも設けたことに伴い、全体として、鋼製柱材３１の使用本数を２本から７本に増大させた点、鋼製梁材３２を長尺化させた点が主に相違するに過ぎない。
よって、この実施例４に係る流木捕捉工４０の設置構造は、流木捕捉工４０を砂防堰堤１０だけで片持ち状態で支持可能な構造を実現できるので、コンクリート基礎を無用化でき、施工性、経済性、及び安定性に優れた流木捕捉工の設置構造を実現できる等、上記実施例３と同様のコンセプトで実施していることに変わりはないので、やはり上記実施例３と同様の作用効果を奏する（前記段落［００３７］参照）。さらに言えば、上記実施例３よりも流木の流下幅が広大な河川に対しても適用可能という利点もある。 4A to 4C show the installation structure of a driftwood trap according to the fourth embodiment.
Similar to the relationship between Example 2 and Example 1, the installation structure of the driftwood trap 40 according to Example 4 differs from Example 3 in that it uses steel pillars according to the form of the erosion control dam 10. 31 not only in the upstream front direction of the water passage section 11 but also in the upstream front direction of both sleeve sections 12, the number of steel columns 31 used as a whole has been reduced from two to seven. The only difference is that the steel beam material 32 is increased in length and the length of the steel beam material 32 is made longer.
Therefore, the installation structure of the driftwood trap 40 according to the fourth embodiment can realize a structure in which the driftwood trap 40 can be supported in a cantilevered state only by the erosion control dam 10, so a concrete foundation can be made unnecessary, and construction efficiency is improved. Since the implementation is based on the same concept as in Example 3 above, such as being able to realize an installation structure for a driftwood trap with excellent economic efficiency and stability, it also has the same effects as Example 3 above. (See paragraph [0037] above). Furthermore, there is an advantage that this embodiment can be applied to rivers where the width of the driftwood is wider than that of the third embodiment.

なお、図５に示したように、鋼製梁材３２を長尺化させたことに伴う流木捕捉工４０全体の安定化が懸念される場合（特には水通し部１１の幅の増大等）は、流木捕捉体の鋼製柱材３１及び／又は鋼製梁材３２（特には中央部に配置する鋼製柱材３１）に対し、砂防堰堤１０本体の上流側側面部から上流側へ突設された土台部材３（水平材３ａ及び方杖材３ｂ）で補剛した構造で実施することも勿論できる。これにより鋼製梁材３２が負担する荷重を分担し、スパンを短くすることができ、部材寸法が大きくなるのを防止し、合理的な構造設計とすることができる。 In addition, as shown in FIG. 5, when there is a concern about the stability of the entire driftwood trap 40 due to the lengthening of the steel beam material 32 (in particular, an increase in the width of the water passage part 11, etc.) , the steel column 31 and/or the steel beam 32 (particularly the steel column 31 placed in the center) of the driftwood trap are protruded from the upstream side surface of the main body of the sabo dam 10 to the upstream side. Of course, it is also possible to implement a structure reinforced by the provided base member 3 (horizontal member 3a and rod member 3b). As a result, the load borne by the steel beam material 32 can be shared, the span can be shortened, the dimensions of the members can be prevented from increasing, and a rational structural design can be achieved.

以上、上記実施例１～５を図面に基づいて説明したが、本発明は、図示例の限りではなく、その技術的思想を逸脱しない範囲において、当業者が通常に行う設計変更、応用のバリエーションの範囲を含むことを念のために言及する。
たとえば、前記流木捕捉工１、２０、３０、４０はすべて、河川の流れ方向に延在する水通し部中央ラインを対称軸とする線対称配置に設置して実施しているがこれに限定されない。洪水時の河川の性状（想定水位、想定流量、掃流区間）等に応じて非線対称配置で実施することも勿論できる。 Although the above embodiments 1 to 5 have been described based on the drawings, the present invention is not limited to the illustrated examples, but includes design changes and application variations that are commonly made by those skilled in the art within the scope of the technical idea thereof. I mention this just to be sure that it includes the range of.
For example, the driftwood traps 1, 20, 30, and 40 are all installed in a symmetrical arrangement with the center line of the water passage extending in the flow direction of the river as the axis of symmetry; however, the present invention is not limited to this. . Of course, it is also possible to use a non-axisymmetric arrangement depending on the characteristics of the river during a flood (estimated water level, estimated flow rate, sweep section), etc.

１ 流木捕捉工
２ 鋼製柱部材
２ａ 鉛直材
２ｂ 斜材
３ 土台部材
３ａ 水平材
３ｂ 方杖材
４ ベースプレート
５ アンカーボルト
６ フランジ接合（フランジ）
７ フランジ接合（フランジ）
１０ 砂防堰堤
１１ 水通し部
１１ａ 袖小口
１２ 袖部
２０ 流木捕捉工
３０ 流木捕捉工
３１ 鋼製柱材
３２ 鋼製梁材
３３ 支持部材
３４ フランジ接合（フランジ）
３５ ベースプレート
３６ アンカーボルト
４０ 流木捕捉工 1 Driftwood trap 2 Steel column member 2a Vertical member 2b Diagonal member 3 Foundation member 3a Horizontal member 3b Cane member 4 Base plate 5 Anchor bolt 6 Flange connection (flange)
7 Flange connection (flange)
10 Sabo dam 11 Water passage part 11a Sleeve edge 12 Sleeve part 20 Driftwood trap 30 Driftwood trap 31 Steel pillar material 32 Steel beam material 33 Support member 34 Flange joint (flange)
35 Base plate 36 Anchor bolt 40 Driftwood catcher

Claims (7)

砂防堰堤に対する流木捕捉工の設置構造であって、
複数の鋼製柱材がそれぞれ、前記砂防堰堤の上流側側面部に設けられた斜材を少なくとも有する土台部材を介して上流側へ片持ち状態で張り出して設けられ、隣接する前記鋼製柱材は鋼製梁材で連結されて成ることを特徴とする、流木捕捉工の設置構造。 An installation structure of a driftwood trap for an erosion control dam,
A plurality of steel pillars are each provided so as to cantilever toward the upstream side via a base member having at least a diagonal member provided on the upstream side surface of the sabo dam, and the adjacent steel pillars is an installation structure for a driftwood trap, which is characterized by being connected by steel beams . 前記鋼製柱材及び／又は前記鋼製梁材は、前記砂防堰堤の両袖部の上流側側面部に上流側へ突き出して設けられた左右の支持部材に連結されていることを特徴とする、請求項１に記載した流木捕捉工の設置構造。 The steel column material and/or the steel beam material are connected to left and right support members provided on upstream side surfaces of both sleeves of the sabo dam so as to protrude toward the upstream side. , An installation structure for a driftwood trap according to claim 1. 前記鋼製柱材は、互いの間隔が、想定される最大流木長の１／２以下に設定されてい
ることを特徴とする、請求項１又は２に記載した流木捕捉工の設置構造。 3. The installation structure of a driftwood trap according to claim 1, wherein the steel pillars are spaced apart from each other to be 1/2 or less of an assumed maximum length of driftwood. 前記砂防堰堤の水通し部の上流側正面方向に２以上の前記鋼製柱材が配置されるように構成されていることを特徴とする、請求項１～３のいずれか１項に記載した流木捕捉工
の設置構造。 The structure according to any one of claims 1 to 3, characterized in that two or more of the steel columns are arranged in the front direction on the upstream side of the water passage part of the sabo dam. Installation structure of driftwood trap. 前記砂防堰堤の両袖部の上流側正面方向にそれぞれ２以上の前記鋼製柱材が配置されるように構成されていることを特徴とする、請求項１～４のいずれか１項に記載した流木
捕捉工の設置構造。 According to any one of claims 1 to 4, the structure is such that two or more of the steel pillars are arranged in the upstream front direction of both sleeves of the erosion control dam. Installation structure of driftwood trap. 前記土台部材は、前記砂防堰堤にアンカーで固定されていることを特徴とする、請求項１～５のいずれか１項に記載した流木捕捉工の設置構造。 The installation structure for a driftwood trap according to any one of claims 1 to 5, wherein the foundation member is fixed to the erosion control dam with an anchor. 前記支持部材は、前記砂防堰堤にアンカーで固定されていることを特徴とする、請求項２に記載した流木捕捉工の設置構造。3. The installation structure for a driftwood trap according to claim 2, wherein the support member is fixed to the erosion control dam with an anchor.
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