JP7405786B2 - Bed protection work - Google Patents

Bed protection work Download PDF

Info

Publication number
JP7405786B2
JP7405786B2 JP2021034562A JP2021034562A JP7405786B2 JP 7405786 B2 JP7405786 B2 JP 7405786B2 JP 2021034562 A JP2021034562 A JP 2021034562A JP 2021034562 A JP2021034562 A JP 2021034562A JP 7405786 B2 JP7405786 B2 JP 7405786B2
Authority
JP
Japan
Prior art keywords
steel sheet
sheet piles
river
protection work
pier
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
JP2021034562A
Other languages
Japanese (ja)
Other versions
JP2022135008A (en
Inventor
政幸 神田
進 中島
太亮 佐名川
達貴 藤本
弘之 伊藤
新一 田島
雄介 井出
宏延 林
裕亮 吉田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kajima Corp
Railway Technical Research Institute
Original Assignee
Kajima Corp
Railway Technical Research Institute
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kajima Corp, Railway Technical Research Institute filed Critical Kajima Corp
Priority to JP2021034562A priority Critical patent/JP7405786B2/en
Publication of JP2022135008A publication Critical patent/JP2022135008A/en
Application granted granted Critical
Publication of JP7405786B2 publication Critical patent/JP7405786B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00—Adapting or protecting infrastructure or their operation
    • Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways

Landscapes

  • Bridges Or Land Bridges (AREA)

Description

本発明は、橋脚を保護し洗掘を防止する護床工に関する。 The present invention relates to bed protection work that protects bridge piers and prevents scouring.

河川に設置された鉄道橋や道路橋等の橋脚において、河川の水流による洗掘を防止するために、橋脚の周囲の河床部に護床工が設置されている。殊に近年は豪雨の規模が拡大しており、洪水による激流から洗掘を防止することが求められている。 BACKGROUND OF THE INVENTION At piers of railway bridges, road bridges, etc. installed on rivers, bed protection works are installed in the river bed around the piers to prevent scouring by river water flow. Especially in recent years, the scale of heavy rains has increased, and there is a need to prevent scouring from torrents caused by floods.

従来、河川に設置された橋脚の洗掘防止対策として、例えば特許文献１等に開示されているように、橋脚の周囲の河床部にコンクリートブロックを敷き詰めた護床工が広く施工されている。 BACKGROUND ART Conventionally, as a measure to prevent scouring of bridge piers installed in a river, a bed protection work in which concrete blocks are spread over the river bed around the bridge piers has been widely constructed, as disclosed in, for example, Patent Document 1.

特開平１１－８１２７８号公報Japanese Patent Application Publication No. 11-81278

しかしながら、コンクリートブロックは重量が大きく、殊に山間部の鉄道橋など、狭隘な場所に設置する場合には、設置場所までの運搬や設置作業が困難であったり、大がかりな作業となり大きな負担が生じるという問題点がある。 However, concrete blocks are heavy and, especially when installed in a narrow space such as a railway bridge in a mountainous area, transporting them to the installation site and installing them may be difficult or require large-scale work, resulting in a heavy burden. There is a problem.

本発明は上記事情に鑑みてなされたものであり、橋脚の河床部の洗掘を効果的に防止することができ、且つ、設置現場までの運搬や設置作業が簡易な護床工を提供することを目的とする。 The present invention has been made in view of the above circumstances, and provides a bed protection work that can effectively prevent scouring of the river bed of a bridge pier and that is easy to transport to the installation site and install. The purpose is to

上記問題を解決するため、本発明は、河川に設けられた橋脚の周囲に設置され、洗掘を防止する護床工であって、前記河川の幅方向および水流方向に連結された鋼矢板で形成され、連結された前記鋼矢板の上端部にコンクリート板が取り付けられていることを特徴としている。
In order to solve the above problem, the present invention is a bed protection work installed around a bridge pier installed in a river to prevent scouring, which comprises steel sheet piles connected in the width direction and water flow direction of the river. It is characterized in that a concrete plate is attached to the upper end of the formed and connected steel sheet piles .

連結された前記鋼矢板のうち、隣接しない一部の鋼矢板の上端がそれ以外の鋼矢板の上端よりも高い位置に打設されており、前記コンクリート板は、下面に窪みが設けられ、前記窪みに前記一部の鋼矢板の上端がはめ込まれてもよい。 Among the connected steel sheet piles, the upper ends of some non-adjacent steel sheet piles are placed at a higher position than the upper ends of the other steel sheet piles, and the concrete plate is provided with a depression on the lower surface, The upper ends of some of the steel sheet piles may be fitted into the depressions.

連結された前記鋼矢板が、前記橋脚に対して前記河川の上流側と下流側とに打設されてもよい。 The connected steel sheet piles may be installed on the upstream side and downstream side of the river with respect to the bridge pier.

また、前記河川の幅方向の前記橋脚の寸法をＤ（ｍｍ）としたとき、河川の水流による最大洗掘深さＺｓ（ｍｍ）、前記橋脚の洗掘に影響する水流の範囲を前記橋脚からの最大距離で表す洗掘範囲Ｌ（ｍｍ）は、それぞれ
Ｚｓ＝１．４５Ｄ
Ｌ＝Ｚｓ／tanθ，θ＝３０°
で求められ、前記鋼矢板は、前記洗掘範囲内に、前記最大洗掘深さまで設置されていることが好ましい。 Further, when the dimension of the pier in the width direction of the river is D (mm), the maximum scouring depth Zs (mm) by the river water flow, and the range of water flow that affects the scouring of the pier from the pier. The scour range L (mm) expressed as the maximum distance is Zs=1.45D, respectively.
L=Zs/tanθ, θ=30°
It is preferable that the steel sheet pile is installed within the scour range up to the maximum scour depth.

本発明によれば、橋脚の河床部の洗掘を効果的に防止することができるとともに、運搬や設置が簡易な護床工を提供することができる。 According to the present invention, it is possible to effectively prevent scouring of the riverbed portion of a bridge pier, and to provide a bed protection work that is easy to transport and install.

本発明の実施の形態の一例を示す平面図である。FIG. 1 is a plan view showing an example of an embodiment of the present invention. 図１の側面図である。FIG. 2 is a side view of FIG. 1; 水流が洗掘に影響する範囲を説明する平面図である。FIG. 3 is a plan view illustrating a range where water flow affects scouring. 水流が洗掘に影響する範囲を説明する側面図である。FIG. 3 is a side view illustrating a range where water flow affects scouring. 水流が洗掘に影響する範囲を説明する正面図である。FIG. 3 is a front view illustrating a range where water flow affects scouring. 護床工の設置例を示す平面図である。FIG. 3 is a plan view showing an example of installing a bed guard. 護床工の設置例を示す側面図である。It is a side view which shows the example of installation of a bed protection work. コンクリート板と鋼矢板との取り付け例を示す図であり、（ａ）はコンクリート板の下面図、（ｂ）は鋼矢板を（ａ）のコンクリート板にはめ込んだ状態を示す断面図である。It is a figure which shows the example of attachment of a concrete board and a steel sheet pile, (a) is a bottom view of a concrete board, (b) is a sectional view which shows the state where the steel sheet pile was fitted into the concrete board of (a).

以下、本発明の実施の形態を、図を参照して説明する。なお、本明細書および図面において、実質的に同一の機能構成を有する要素においては、同一の符号を付することにより重複説明を省略する。 Embodiments of the present invention will be described below with reference to the drawings. Note that in this specification and the drawings, elements having substantially the same functional configuration are designated by the same reference numerals and redundant explanation will be omitted.

図１および図２は、本発明の実施形態の一例を示し、図１は上方から見た図、図２は側方から見た図である。 1 and 2 show an example of an embodiment of the present invention, with FIG. 1 being a view seen from above and FIG. 2 being a view seen from the side.

本発明の実施形態にかかる護床工１は、鋼矢板１１を連結して構成され、河川に設置された鉄道橋や道路橋等の橋脚２の直接基礎２１の周囲、殊に河川の上流側および下流側等、水流が洗掘に影響することが想定される位置に設置される。直接基礎２１が構築されている場所は、通常、河床３から基盤面４までがあまり深くなく、また堅固な基盤面４は洗掘されにくい。そのため、護床工１は、河床３から基盤面４までの深さに設ければよいので、護床工１を形成する鋼矢板は、それほど長尺のものは必要がなく、数ｍ程度の長さとされる。 The bed protection work 1 according to the embodiment of the present invention is constructed by connecting steel sheet piles 11, and is used around the direct foundation 21 of a bridge pier 2 of a railway bridge or road bridge installed in a river, especially on the upstream side of the river. They are installed in locations where water flow is expected to affect scouring, such as on the downstream side. In the place where the direct foundation 21 is constructed, the distance from the river bed 3 to the base surface 4 is usually not very deep, and the solid base surface 4 is not easily scoured. Therefore, the bed protection work 1 only needs to be installed at a depth from the river bed 3 to the foundation surface 4, so the steel sheet piles that form the bed protection work 1 do not need to be very long, and are approximately several meters long. It is considered to be the length.

本実施形態では、護床工１は、図１に示すように、鋼矢板１１を、河川の幅方向Ｘおよび水流方向Ｙの二方向に、格子状に連結して形成される。このように鋼矢板１１を水流方向Ｙにも連結して設けることにより、河川の水流に抵抗できる剛性を確保できる。なお、水流に抵抗する剛性を得ることができれば、連結構造は格子状に限らず、例えばハニカム状に連結してもよい。 In this embodiment, the bed protection work 1 is formed by connecting steel sheet piles 11 in a lattice shape in two directions, the width direction X of the river and the water flow direction Y, as shown in FIG. By connecting and providing the steel sheet piles 11 also in the water flow direction Y in this way, rigidity capable of resisting river water flow can be ensured. Note that the connection structure is not limited to a lattice shape, but may be connected in a honeycomb shape, for example, as long as rigidity to resist water flow can be obtained.

護床工１は、上記のように鋼矢板１１を格子状に連結して打設するだけでもよいが、鋼矢板１１の上端部に、適宜厚さのコンクリート板１２を取り付けてもよい。これにより、鋼矢板１１同士の隙間を埋め、隙間から洗掘されるのを防止することができ、さらに水流による鋼矢板１１の流出を防ぐことができる。コンクリート板１２は、例えば、下面側に鋼矢板１１をはめ込むための窪みまたは溝を設けておくことで、鋼矢板１１の上端部に載置した際に、窪みまたは溝に鋼矢板１１の上端部がはめ込まれ、鋼矢板１１と一体化させることができる。なお、鋼矢板１１の上端部に取り付ける部材としては、コンクリートが好適であるが、水よりも比重が大きく、水流に対して十分な抵抗力を発揮できるものであれば、コンクリート以外の材質でもよい。 The bed protection work 1 may be simply constructed by connecting the steel sheet piles 11 in a lattice shape as described above, but a concrete plate 12 of an appropriate thickness may be attached to the upper end of the steel sheet piles 11. Thereby, it is possible to fill the gaps between the steel sheet piles 11 and prevent the steel sheet piles 11 from being scoured through the gaps, and it is also possible to prevent the steel sheet piles 11 from flowing out due to water flow. For example, the concrete board 12 is provided with a depression or a groove in which the steel sheet pile 11 is fitted on the lower surface side, so that when it is placed on the upper end of the steel sheet pile 11, the upper end of the steel sheet pile 11 is inserted into the depression or groove. can be fitted and integrated with the steel sheet pile 11. Although concrete is suitable as a member to be attached to the upper end of the steel sheet pile 11, materials other than concrete may be used as long as the material has a higher specific gravity than water and can exert sufficient resistance against water flow. .

以上のように形成された護床工１は、橋脚２に対して河川の上流側に設けられ、下流側にも設けることが好ましい。河川の水流に対して平行方向となる橋脚の側方には、設けた方が洗掘防止効果は高くなるが、無くても構わない。 It is preferable that the bed protection structure 1 formed as described above is provided on the upstream side of the river with respect to the pier 2, and also provided on the downstream side. It is better to provide a scouring prevention effect on the side of the bridge pier that is parallel to the water flow of the river, but it is not necessary.

図３～図５は、河川の水流が洗掘に影響すると考えられる範囲を示す図である。図３は平面図、図４は側面図、図５は正面図であり、河川の水流方向は図３および図４に示す通りである。河川の幅方向すなわち水流に対して垂直方向となる橋脚２の幅をＤ（ｍｍ）、河床からの最大洗掘深さをＺｓ（ｍｍ）、洗掘範囲（橋脚２の洗掘に影響する水流の範囲の、橋脚２の側面からの最大距離）をＬ（ｍｍ）としたとき、
Ｚｓ＝１．４５Ｄ
Ｌ＝Ｚｓ／tanθ，一般にθ＝３０°
と想定することができる。したがって、護床工１は、最大洗掘深さＺｓまでの深さ、且つ、洗掘範囲Ｌまでの範囲に設けることが好ましい。 FIGS. 3 to 5 are diagrams showing the range where river water flow is thought to affect scouring. 3 is a plan view, FIG. 4 is a side view, and FIG. 5 is a front view, and the water flow direction of the river is as shown in FIGS. 3 and 4. The width of the pier 2 in the width direction of the river, that is, the direction perpendicular to the water flow, is D (mm), the maximum scouring depth from the riverbed is Zs (mm), the scouring range (water flow that affects the scouring of the pier 2) When L (mm) is the maximum distance from the side of the pier 2 in the range of
Zs=1.45D
L=Zs/tanθ, generally θ=30°
It can be assumed that Therefore, it is preferable that the bed protection work 1 is provided at a depth up to the maximum scour depth Zs and in a range up to the scour range L.

図６は、上記計算によって求めた洗掘範囲Ｌに基づく護床工１の設置例を示す平面図であり、図７は最大洗掘深さＺｓに基づく護床工１の設置例を示す側面図である。本実施形態では、護床工１は、洗掘範囲Ｌのうち、橋脚２に対して河川の水流の上流側および下流側に、それぞれ鋼矢板１１を格子状に連結して設けられている。橋脚２の側方については、護床工１を設けた方が洗掘防止効果が向上するが、無くても構わない。 FIG. 6 is a plan view showing an installation example of the bed protection work 1 based on the scour range L determined by the above calculation, and FIG. 7 is a side view showing an installation example of the bed protection work 1 based on the maximum scour depth Zs. It is a diagram. In this embodiment, the bed protection work 1 is provided by connecting steel sheet piles 11 in a lattice pattern on the upstream and downstream sides of the river water flow with respect to the pier 2 in the scour area L. Regarding the sides of the piers 2, the anti-scouring effect will be improved if the bed protection works 1 are provided, but they may not be provided.

なお、橋脚２のスパンと橋脚２の径との関係にもよるが、各橋脚２の周囲に設ける護床工１同士は、連続してもよいし、橋脚２毎に護床工１が分離していてもよい。護床工１を橋脚２同士の間に連続して形成した場合には、構造上は強固な構造物となるが、洗掘防止の観点からは、洗掘範囲Ｌの範囲外には護床工１を設けなくてもよい。 Note that depending on the relationship between the span of the pier 2 and the diameter of the pier 2, the bed protection work 1 provided around each pier 2 may be continuous, or the bed protection work 1 may be separated for each pier 2. You may do so. If the bed protection work 1 is formed continuously between the piers 2, it will become a structurally strong structure, but from the viewpoint of preventing scouring, the bed protection work is not required outside the scouring range L. It is not necessary to provide the workpiece 1.

以下、本発明の実施形態にかかる護床工１の施工手順の例について説明する。 Hereinafter, an example of the construction procedure of the bed protection work 1 according to the embodiment of the present invention will be described.

対象とする橋脚２の最大洗掘深さＺｓまで打設可能な長さの鋼矢板１１を施工場所まで運搬し、橋脚２の周囲の洗掘範囲に打設する。鋼矢板１１の打設は、通常鋼矢板を地中へ圧入する際に用いられる一般の杭圧入機等によって行えばよい。鋼矢板１１は、洗掘範囲内において、河川の幅方向および水流方向に格子状に連結して打設する。鋼矢板１１同士の連結は、通常の鋼矢板の連結方法と同様、セクション部で連結すればよい。 A steel sheet pile 11 of a length that can be driven up to the maximum scour depth Zs of the target pier 2 is transported to the construction site and is driven in the scour area around the pier 2. The steel sheet piles 11 may be driven using a general pile press-in machine or the like that is normally used when press-fitting steel sheet piles into the ground. The steel sheet piles 11 are installed in a lattice-like manner connected in the width direction of the river and in the water flow direction within the scour area. The steel sheet piles 11 may be connected to each other at the section portions in the same manner as a normal method for connecting steel sheet piles.

そして、連結された鋼矢板１１の上端部に、コンクリート板１２を取り付ける。コンクリート板１２は、平面部の面積が、連結された複数の鋼矢板１１の適宜範囲を覆うサイズであり、下面側に、例えば図８（ａ）に示すように、１体の鋼矢板１１の断面の外周よりも少し大きい窪み１３を設けておく。一方、打設される鋼矢板１１のうち、上端部をコンクリート板１２の窪み１３にはめ込む鋼矢板１１ａを、コンクリート板１２の面積に応じて、隣接しないように適宜間隔で選択し、選択された鋼矢板１１ａは、他の鋼矢板１１よりも、上端の位置がコンクリート板１２の窪み１３の深さと略同程度、例えば３０ｃｍ程度高くなるように打設する。そして、上端が高く打設された鋼矢板１１ａの上端部の位置と、コンクリート板１２の窪み１３の位置とを合わせてコンクリート板１２を載置し、図８（ｂ）に示すように、コンクリート板１２を鋼矢板１１ａの上端部にはめ込む。これにより、鋼矢板１１同士を連結したままで、打設後の全ての鋼矢板１１の上端部にコンクリート板１２を取り付けることができる。 Then, a concrete plate 12 is attached to the upper end of the connected steel sheet piles 11. The concrete plate 12 has a planar area of a size that covers an appropriate range of a plurality of connected steel sheet piles 11, and has a surface area of one steel sheet pile 11 on the lower surface side, for example, as shown in FIG. 8(a). A recess 13 slightly larger than the outer periphery of the cross section is provided. On the other hand, among the steel sheet piles 11 to be placed, the steel sheet piles 11a whose upper ends are to be fitted into the recesses 13 of the concrete plate 12 are selected at appropriate intervals according to the area of the concrete plate 12 so as not to be adjacent to each other. The steel sheet pile 11a is placed so that the upper end position is approximately the same as the depth of the depression 13 of the concrete plate 12, for example, approximately 30 cm higher than the other steel sheet piles 11. Then, the concrete plate 12 is placed so that the upper end of the steel sheet pile 11a, whose upper end is cast high, and the position of the recess 13 of the concrete plate 12 are aligned, and as shown in FIG. The plate 12 is fitted into the upper end of the steel sheet pile 11a. Thereby, the concrete plates 12 can be attached to the upper ends of all the steel sheet piles 11 after being placed, while the steel sheet piles 11 remain connected to each other.

本発明は、橋脚２自体の構造を補強するものではなく、洗掘防止のために設置するものである。したがって、鋼矢板１１を橋脚２に連結する必要はなく、上記のように、橋脚２の周囲に鋼矢板１１を打設するだけで施工できる。 The present invention is not intended to reinforce the structure of the pier 2 itself, but is installed to prevent scouring. Therefore, there is no need to connect the steel sheet piles 11 to the pier 2, and the construction can be performed simply by driving the steel sheet piles 11 around the pier 2 as described above.

以上のように、例えば洪水の被害が想定される場所の橋脚２において、渇水期に鋼矢板１１を河床部に打設して護床工１を施工しておくことで、橋脚２の基礎部分の洗掘防止を図り、洪水時の橋脚２の転倒等の被害を防ぐことができる。本実施形態では、鋼矢板１１を河川の水流に対して垂直方向および平行方向に配置して格子状に連結することで、流水に対する抵抗力が向上し、十分な洗掘防止効果を発揮することができる。 As described above, for example, at a bridge pier 2 in a place where flood damage is expected, by driving the steel sheet piles 11 into the river bed and constructing the bed protection work 1 during the dry season, the foundation of the pier 2 can be It is possible to prevent damage such as overturning of the bridge pier 2 during floods. In this embodiment, by arranging the steel sheet piles 11 in a direction perpendicular and parallel to the water flow of the river and connecting them in a lattice shape, the resistance to flowing water is improved and a sufficient scour prevention effect is achieved. I can do it.

しかも、従来のコンクリートブロック製の護床工に比べて軽量な鋼矢板１１を用いることで、狭隘な山間部等に施工する場合でも、運搬や施工が簡易になり、作業性が向上する。さらに、鋼矢板１１の上端部にコンクリート板１２をはめ込めば、鋼矢板１１同士の隙間からの洗掘を防ぐとともに、軽量な鋼矢板１１が洪水時等に流されるのを防止することができる。 Moreover, by using the steel sheet pile 11, which is lighter than conventional concrete block bed protection construction, even when construction is carried out in narrow mountainous areas, transportation and construction are simplified, and work efficiency is improved. Furthermore, by fitting the concrete plate 12 into the upper end of the steel sheet piles 11, it is possible to prevent scouring from the gaps between the steel sheet piles 11 and to prevent the lightweight steel sheet piles 11 from being washed away during floods or the like.

なお、護床工１は、通常、水中に設置された橋脚２に対して施工されるが、洪水時に水流の発生が想定される橋台の周囲に設置してもよい。 Note that the bed protection work 1 is normally constructed on the bridge piers 2 installed in the water, but it may be installed around the bridge abutments where water flow is expected to occur during a flood.

以上、本発明の好適な実施形態について説明したが、本発明はかかる例に限定されない。当業者であれば、特許請求の範囲に記載された技術的思想の範疇内において、各種の変更例または修正例に想到しうることは明らかであり、それらについても当然に本発明の技術的範囲に属するものと了解される。 Although the preferred embodiments of the present invention have been described above, the present invention is not limited to such examples. It is clear that those skilled in the art can come up with various changes or modifications within the scope of the technical idea described in the claims, and these naturally fall within the technical scope of the present invention. It is understood that it belongs to

本発明は、鉄道橋や道路橋の橋脚の洗掘防止対策として有用である。 INDUSTRIAL APPLICABILITY The present invention is useful as a measure to prevent scouring of piers of railway bridges and road bridges.

１ 護床工
２ 橋脚
３ 河床
４ 基盤面
１１ 鋼矢板
１２ コンクリート板
１３ 窪み 1 Bed protection work 2 Pier 3 Riverbed 4 Foundation surface 11 Steel sheet pile 12 Concrete plate 13 Hollow

Claims (4)

河川に設けられた橋脚の周囲に設置され、洗掘を防止する護床工であって、
前記河川の幅方向および水流方向に連結された鋼矢板で形成され、
連結された前記鋼矢板の上端部にコンクリート板が取り付けられていることを特徴とする、護床工。 A bed protection work installed around bridge piers installed in a river to prevent scouring.
Formed by steel sheet piles connected in the width direction and water flow direction of the river ,
A bed protection work, characterized in that a concrete plate is attached to the upper end of the connected steel sheet piles . 連結された前記鋼矢板のうち、隣接しない一部の鋼矢板の上端がそれ以外の鋼矢板の上端よりも高い位置に打設されており、
前記コンクリート板は、下面に窪みが設けられ、
前記窪みに前記一部の鋼矢板の上端がはめ込まれていることを特徴とする、請求項１に記載の護床工。 Among the connected steel sheet piles, the upper ends of some non-adjacent steel sheet piles are driven at a higher position than the upper ends of other steel sheet piles,
The concrete plate is provided with a depression on the lower surface,
The bed protection work according to claim 1 , wherein the upper end of the part of the steel sheet pile is fitted into the recess. 連結された前記鋼矢板が、前記橋脚に対して前記河川の上流側と下流側とに打設されていることを特徴とする、請求項１または２のいずれか一項に記載の護床工。 The bed protection work according to claim 1 or 2 , wherein the connected steel sheet piles are cast on the upstream side and downstream side of the river with respect to the bridge pier. . 前記河川の幅方向の前記橋脚の寸法をＤ（ｍｍ）としたとき、河川の水流による最大洗掘深さＺｓ（ｍｍ）、前記橋脚の洗掘に影響する水流の範囲を前記橋脚からの最大距離で表す洗掘範囲Ｌ（ｍｍ）は、それぞれ
Ｚｓ＝１．４５Ｄ
Ｌ＝Ｚｓ／tanθ，θ＝３０°
で求められ、
前記鋼矢板は、前記洗掘範囲内に、前記最大洗掘深さまで設置されていることを特徴とする、請求項１～３のいずれか一項に記載の護床工。
When the dimension of the pier in the width direction of the river is D (mm), the maximum scouring depth by the river water flow Zs (mm), and the range of water flow that affects the scouring of the pier is the maximum from the pier. The scour range L (mm) expressed in distance is Zs = 1.45D, respectively.
L=Zs/tanθ, θ=30°
is required,
The bed protection work according to any one of claims 1 to 3 , wherein the steel sheet pile is installed within the scour range up to the maximum scour depth.
JP2021034562A 2021-03-04 2021-03-04 Bed protection work Active JP7405786B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2021034562A JP7405786B2 (en) 2021-03-04 2021-03-04 Bed protection work

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2021034562A JP7405786B2 (en) 2021-03-04 2021-03-04 Bed protection work

Publications (2)

Publication Number Publication Date
JP2022135008A JP2022135008A (en) 2022-09-15
JP7405786B2 true JP7405786B2 (en) 2023-12-26

Family

ID=83231418

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2021034562A Active JP7405786B2 (en) 2021-03-04 2021-03-04 Bed protection work

Country Status (1)

Country Link
JP (1) JP7405786B2 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005290869A (en) 2004-03-31 2005-10-20 Yukitake Shioi Reinforcing structure of structure on water
JP2016037840A (en) 2014-08-12 2016-03-22 Ｊｆｅスチール株式会社 Scour prevention structure for abutment and bridge pier
JP2016094776A (en) 2014-11-17 2016-05-26 株式会社技研製作所 Coastal levee

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005290869A (en) 2004-03-31 2005-10-20 Yukitake Shioi Reinforcing structure of structure on water
JP2016037840A (en) 2014-08-12 2016-03-22 Ｊｆｅスチール株式会社 Scour prevention structure for abutment and bridge pier
JP2016094776A (en) 2014-11-17 2016-05-26 株式会社技研製作所 Coastal levee

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
佐溝昌彦，ほか３名，統計的手法による鉄道橋梁の増水時における被災注意橋脚抽出手法，土木学会論文集Ｄ３（土木計画学），Vol. 69, No. 3，日本，2013年，第237-249頁
宇多高明，ほか２名，治水上から見た橋脚問題に関する検討，土木研究所資料，第3225号，日本，建設省土木研究所河川部河川研究室，1993年11月

Also Published As

Publication number Publication date
JP2022135008A (en) 2022-09-15

Similar Documents

Publication Publication Date Title
CN204039977U (en) A kind of antidetonation disappears unrestrained bank protection
JP7405786B2 (en) Bed protection work
JP5407995B2 (en) Filling reinforcement structure
KR200452943Y1 (en) Butler's Square Dam with Mixed Screen
CN104963323A (en) Scour-preventing groove for chain precast block protective surface
KR20120073623A (en) Connecting structure of steel pipe sheet pile
JP5983436B2 (en) Gravity breakwater
CN109930559B (en) Dam reinforcing structure and construction method thereof
JP2608018B2 (en) Transmission type driftwood generation control
JP5889102B2 (en) Tide structure
JPH0529217Y2 (en)
KR100935219B1 (en) Fabrication method for replaceable revetment blocks
CN215925602U (en) Pier protection device capable of reducing local scouring
CN217678934U (en) Be applied to novel energy dissipater behind many silt river diversion pivot floodgate
CN204728288U (en) Chain prefabricated section mask anti-scour trench
CN211816340U (en) Riverway slope protection cofferdam structure
JP7141157B1 (en) Blocks for forming slopes, slope structures, and flood control structures
JP6884912B1 (en) Embankment reinforcement structure using PC sheet pile
KR200338418Y1 (en) Cassion safeguard structure of bridge's basis using urethane band
JP4121669B2 (en) Revetment wall piles and revetment structures
KR100478774B1 (en) Block
JP3619953B2 (en) River structure using composite pile for river structure and back split levee using the river structure
JP2017106161A (en) Hollow-part water-flowing type bank
JP4067705B2 (en) Transmission type breakwater made of steel plate cell type structure
KR100477379B1 (en) Breast wall structure of embankment for river

Legal Events

Date Code Title Description
A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20210317

A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20230206

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20230915

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20230926

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20231025

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20231205

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20231214

R150 Certificate of patent or registration of utility model

Ref document number: 7405786

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150