JP2022011792A - Corrosion prevention apparatus for steel materials and corrosion prevention method for steel pipe piles - Google Patents

Corrosion prevention apparatus for steel materials and corrosion prevention method for steel pipe piles Download PDF

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JP2022011792A
JP2022011792A JP2020113152A JP2020113152A JP2022011792A JP 2022011792 A JP2022011792 A JP 2022011792A JP 2020113152 A JP2020113152 A JP 2020113152A JP 2020113152 A JP2020113152 A JP 2020113152A JP 2022011792 A JP2022011792 A JP 2022011792A
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steel pipe
pipe pile
container portion
opening
anticorrosion
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JP7167096B2 (en
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勇司 前田
Yuji Maeda
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Penta Ocean Construction Co Ltd
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Abstract

To provide corrosion prevention means for steel pipe piles with reduced labor and cost and ease of maintenance.SOLUTION: A corrosion prevention apparatus 2, which covers a part of a steel pipe pile 1 driven into the sea bottom SB and whose top end is exposed above the sea surface, comprises a container part 21, a joint part 22, and an open/close part 23. The container part 21 has a first opening 212 that communicates with seawater at a position that is lower than L.W.L. by at least half the maximum wave height in the state of being attached to the steel pipe pile 1 by the joint part 22, and a second opening 213 that communicates with the atmosphere at a point higher than H. W. L., and covers at least the portion of the steel pipe pile 1 that is exposed to the splash zone. The open/close part 23 opens and closes the second opening 213.SELECTED DRAWING: Figure 1

Description

本発明は、鋼材の防食器具、および鋼管杭の防食方法に関する。 The present invention relates to an anticorrosion device for steel materials and an anticorrosion method for steel pipe piles.

海底に打設され、海上の構築物を支持する鋼管杭は、何ら対策が施されなければ、飛沫帯と呼ばれる海水飛沫に晒される部分において容易に腐食が進む。そのような腐食を低減させるための技術として、例えば特許文献1がある。 Steel pipe piles that are placed on the seabed and support structures on the sea easily corrode in areas exposed to seawater droplets, called droplet zones, unless any measures are taken. As a technique for reducing such corrosion, for example, Patent Document 1 is available.

特許文献1には、プラスチック製の防食施工型枠を、鋼管杭の最大海面位置と最小海面位置とを含む範囲を被覆するように配置し、鋼管杭と防食施工型枠との間にポリマーセメントモルタルなどの充填材を充填することで、鋼管杭の腐食を低減する技術が記載されている。 In Patent Document 1, a plastic anticorrosion formwork is arranged so as to cover a range including the maximum sea level position and the minimum sea level position of the steel pipe pile, and polymer cement is provided between the steel pipe pile and the anticorrosion work formwork. A technique for reducing corrosion of steel pipe piles by filling with a filler such as mortar is described.

特開2006-125050号公報Japanese Unexamined Patent Publication No. 2006-1205050

特許文献1に記載の発明による場合、現場において充填材を充填する作業を要し、手間と費用がかかる。 In the case of the invention described in Patent Document 1, the work of filling the filler at the site is required, which is troublesome and costly.

上述の背景に鑑み、本発明は、従来技術と比較し、手間と費用が低減される防食手段を提供する。 In view of the above background, the present invention provides an anticorrosion means that reduces labor and cost as compared with the prior art.

上述した課題を解決するために、本発明は、海底に打設され天端が海水面より上に露出している鋼管杭の一部を覆う防食器具であって、前記鋼管杭と接合される接合部と、前記接合部により前記鋼管杭に取り付けられた状態において、L. W. L.より最大波高の半分以上低い位置において海水と通じる第1の開口部と、H. W. L.より高い位置において大気と通じる第2の開口部とを有し、前記鋼管杭の少なくとも飛沫帯に晒される部分を覆う容器部と、前記第2の開口部を開閉する開閉部とを備える鋼材の防食器具を第1の態様として提供する。
第1の態様の鋼材の防食器具によれば、手間と費用が低減された、メインテナンス性に優れた鋼管杭の防食を実現できる。
In order to solve the above-mentioned problems, the present invention is an anticorrosion device that covers a part of a steel pipe pile that is placed on the sea floor and whose top end is exposed above the seawater surface, and is joined to the steel pipe pile. A first opening that communicates with seawater at a position that is more than half the maximum wave height below the LWL and a second opening that communicates with the atmosphere at a position higher than the HWL when the joint is attached to the steel pipe pile by the joint. A steel pipe anticorrosion device is provided as a first aspect, comprising a container portion having a portion and covering at least a portion of the steel pipe pile exposed to a splash zone, and an opening / closing portion for opening and closing the second opening.
According to the anticorrosion device for steel materials of the first aspect, it is possible to realize anticorrosion of steel pipe piles having excellent maintainability with reduced labor and cost.

第1の態様の防食器具において、前記容器部は、前記開閉部により前記第2の開口部が閉鎖された状態で、前記容器部の内周面と前記鋼管杭の外周面の間の空間に、前記容器部の外側の海水面より高い水位の海水を保持する、という構成が第2の態様として採用されてもよい。
第2の態様の防食器具によれば、鋼管杭の容器部に覆われた部分を一定の海水で満たすことにより、防食を実現できる。
In the anticorrosion device of the first aspect, the container portion is provided in the space between the inner peripheral surface of the container portion and the outer peripheral surface of the steel pipe pile in a state where the second opening is closed by the opening / closing portion. A configuration in which seawater having a water level higher than the sea level outside the container portion is held may be adopted as the second aspect.
According to the anticorrosion device of the second aspect, anticorrosion can be realized by filling the portion covered with the container portion of the steel pipe pile with a certain amount of seawater.

第1又は第2の態様の防食器具において、前記接合部は前記接合部で前記鋼管杭に溶接される鋼製である、という構成が第3の態様として採用されてもよい。
第3の態様の防食器具によれば、溶接により鋼管杭と防食器具との接合を行うことにより、容器部内の密閉性を高めることができる。
In the anticorrosion device of the first or second aspect, the configuration that the joint portion is made of steel welded to the steel pipe pile at the joint portion may be adopted as the third aspect.
According to the anticorrosion device of the third aspect, the airtightness inside the container portion can be improved by joining the steel pipe pile and the anticorrosion device by welding.

第1又は第2の態様の防食器具において、前記容器部はプラスチック製であり、前記接合部はシール材を有する、という構成が第4の態様として採用されてもよい。
第4の態様の防食器具によれば、容易に鋼管杭と防食器具との接合を行うことができる。
In the anticorrosion device of the first or second aspect, the configuration that the container portion is made of plastic and the joint portion has a sealing material may be adopted as the fourth aspect.
According to the anticorrosion device of the fourth aspect, the steel pipe pile and the anticorrosion device can be easily joined.

第4の態様の防食器具において、前記容器部は透明な強化プラスチック製である、という構成が第5の態様として採用されてもよい。
第5の態様の防食器具によれば、透明な容器部を介して、海水が満たされた状態、鋼管杭の腐食状態等を視認することができる。
In the anticorrosion device of the fourth aspect, the configuration that the container portion is made of transparent reinforced plastic may be adopted as the fifth aspect.
According to the anticorrosion device of the fifth aspect, the state of being filled with seawater, the state of corrosion of steel pipe piles, and the like can be visually recognized through the transparent container portion.

また、本発明は、海底に打設され天端が海水面より上に露出している鋼管杭に、L. W. L.より最大波高の半分以上低い位置において海水と通じる第1の開口部と、H. W. L.より高い位置において大気と通じる第2の開口部とを有する容器部を備える防食器具を接合部により接合し、前記容器部で前記鋼管杭の少なくとも飛沫帯に晒される部分を覆う状態に設置するステップと、前記第2の開口部から前記容器部内の空気を吸い出し、前記容器部の内周面と前記鋼管杭の外周面の間の空間に、前記容器部の外側の海水面より高い水位まで揚水するステップと、前記容器部の内周面と前記鋼管杭の外周面の間の空間内の水位が前記容器部の外側の海水面より高い状態において前記第2の開口部を閉鎖するステップとを備える鋼管杭の防食方法を第6の態様として提供する。
第6の態様の鋼管杭の防食方法によれば、手間と費用が低減された、メインテナンス性に優れた鋼管杭の防食を実現できる。
In addition, the present invention has a first opening that communicates with seawater at a position that is more than half the maximum wave height below LWL in a steel pipe pile that is placed on the seabed and whose top is exposed above the seawater surface, and is higher than HWL. A step of joining an anticorrosion device having a container portion having a second opening that communicates with the atmosphere at a position by a joint portion, and installing the container portion so as to cover at least a portion of the steel pipe pile exposed to a splash zone. A step of sucking air inside the container portion from the second opening and pumping water into the space between the inner peripheral surface of the container portion and the outer peripheral surface of the steel pipe pile to a water level higher than the seawater surface outside the container portion. A steel pipe including a step of closing the second opening when the water level in the space between the inner peripheral surface of the container portion and the outer peripheral surface of the steel pipe pile is higher than the seawater surface outside the container portion. A method for preventing corrosion of piles is provided as a sixth aspect.
According to the method for preventing corrosion of steel pipe piles according to the sixth aspect, it is possible to realize corrosion protection of steel pipe piles having excellent maintainability with reduced labor and cost.

第6の態様の鋼管杭の防食方法において、前記接合部は鋼製であり、前記設置するステップは、前記接合部を前記鋼管杭に溶接するステップを含む、という構成が第7の態様として採用されてもよい。
第7の態様の鋼管杭の防食方法によれば、溶接により鋼管杭と防食器具との接合を行い、容器部内に密閉空間を作ることができる。
In the method for preventing corrosion of steel pipe piles in the sixth aspect, the configuration in which the joint portion is made of steel and the step of installing the joint portion includes a step of welding the joint portion to the steel pipe pile is adopted as the seventh aspect. May be done.
According to the method for preventing corrosion of steel pipe piles according to the seventh aspect, the steel pipe piles and the anticorrosion equipment can be joined by welding to create a closed space in the container portion.

第7の態様の鋼管杭の防食方法において、前記容器部は強化プラスチック製であり、前記設置するステップは、前記接合部が有するシール材で前記鋼管杭をシールするステップを含む、という構成が第8の態様として採用されてもよい。
第8の態様の鋼管杭の防食方法によれば、容易に鋼管杭と防食器具との接合を行うことができる。
In the method for preventing corrosion of steel pipe piles according to the seventh aspect, the container portion is made of reinforced plastic, and the installation step includes a step of sealing the steel pipe pile with a sealing material possessed by the joint portion. It may be adopted as the aspect of 8.
According to the method for preventing corrosion of steel pipe piles according to the eighth aspect, the steel pipe piles and the anticorrosion equipment can be easily joined.

一実施形態に係る防食器具を鋼管杭に取り付けた状態を示した図。The figure which showed the state which attached the anticorrosion equipment which concerns on one Embodiment to a steel pipe pile. 一実施形態に係る防食器具の構成を示した図。(a)は上面図、(b)は正面図、(c)は底面図。The figure which showed the structure of the anticorrosion device which concerns on one Embodiment. (A) is a top view, (b) is a front view, and (c) is a bottom view. 一実施形態に係る防食器具の断面を示した図。The figure which showed the cross section of the anticorrosion device which concerns on one Embodiment. 一実施形態に係る容器部の側面開口部とバルブを示した図。The figure which showed the side opening and the valve of the container part which concerns on one Embodiment. 一実施形態に係る防食器具を鋼管杭に取り付けるための構成を示した図。(a)は防食器具の容器部に対してシール部材が取り付けられる様子を示した図、(b)は鋼管杭に対して防食器具の容器部が取り付けられる様子を示した図、(c)は鋼管杭に防食器具が取り付けられた状態を示した図。The figure which showed the structure for attaching the anticorrosion equipment which concerns on one Embodiment to a steel pipe pile. (A) is a diagram showing how the sealing member is attached to the container portion of the anticorrosion equipment, (b) is a diagram showing how the container portion of the anticorrosion equipment is attached to the steel pipe pile, and (c) is a diagram showing how the container portion of the anticorrosion equipment is attached. The figure which showed the state which the anticorrosion equipment was attached to the steel pipe pile. 一実施形態に係る鋼管杭の防食方法における、防食処理を施す工程を示したフローチャート。The flowchart which showed the process of performing the anticorrosion treatment in the anticorrosion method of the steel pipe pile which concerns on one Embodiment. 一実施形態に係る鋼管杭の防食方法における、鋼管杭が海底に打設された状態を示した図。The figure which showed the state which the steel pipe pile was placed on the seabed in the corrosion protection method of the steel pipe pile which concerns on one Embodiment. 一実施形態に係る鋼管杭の防食方法における、鋼管杭の上部に防食器具が被せられて接合された状態を示した図。The figure which showed the state which the corrosion protection equipment was put on the upper part of the steel pipe pile, and was joined in the corrosion protection method of the steel pipe pile which concerns on one Embodiment. 一実施形態に係る鋼管杭の防食方法における、鋼管杭に対して支保工を設置した状態を示した図。The figure which showed the state which the support work was installed for the steel pipe pile in the corrosion protection method of the steel pipe pile which concerns on one Embodiment. 一実施形態に係る鋼管杭の防食方法における、鋼管杭に上部コンクリートを構築した状態を示した図。The figure which showed the state which the upper concrete was constructed on the steel pipe pile in the corrosion protection method of the steel pipe pile which concerns on one Embodiment. 一実施形態に係る鋼管杭の防食方法における、鋼管杭に電気防食陽極を取り付けた状態を示した図。The figure which showed the state which attached the electric corrosion protection anode to the steel pipe pile in the corrosion protection method of the steel pipe pile which concerns on one Embodiment. 一実施形態に係る鋼管杭の防食方法における、防食器具の容器部内の海水を揚水する処理を説明するため断面図。(a)は揚水を開始する前の状態を示した図、(b)はポンプが作動して容器部内の空気が吸い出されている状態を示した図、(c)は容器部内の海水面が上昇した状態を示した図。A cross-sectional view for explaining a process of pumping seawater in a container portion of an anticorrosion device in an anticorrosion method for a steel pipe pile according to an embodiment. (A) is a diagram showing the state before the start of pumping, (b) is a diagram showing the state in which the pump is operated and the air in the container is sucked out, and (c) is the sea level in the container. The figure which showed the state which was raised. 一変形例に係る防食器具を鋼管杭に取り付けた状態を示した図。The figure which showed the state which attached the anticorrosion equipment which concerns on one modification to a steel pipe pile. 一変形例に係る鋼管杭の防食方法における、鋼管杭に対して支保工を設置した状態を示した図。(I) The figure which showed the state which the support work was installed for the steel pipe pile in the corrosion protection method of the steel pipe pile which concerns on a modification.

[実施形態]
以下に本発明の一実施形態に係る鋼管杭1に用いる防食器具2を説明する。図1は、鋼管杭1に防食器具2が取り付けられた状態を示した図である。
[Embodiment]
The anticorrosion device 2 used for the steel pipe pile 1 according to the embodiment of the present invention will be described below. FIG. 1 is a diagram showing a state in which the anticorrosion device 2 is attached to the steel pipe pile 1.

鋼管杭1は、円柱形状の鋼材であり、海底SBに打設され、上部が海面H. W. L. (Hight Water Level、朔望平均満潮面)より上に露出している。 The steel pipe pile 1 is a cylindrical steel material, which is placed on the seabed SB, and the upper part is exposed above the sea level H.W.L. (Hight Water Level).

防食器具2は、円柱形状の容器であり、鋼管杭1の上部の外周面を覆うような状態で取り付けられている。防食器具2は、容器部21、接合部であるシール材22、開閉部であるバルブ23とから構成されている。容器部21は、円筒形状であり、図中の上側に上側開口部211、下側(海底SB側)に下側開口部212(第1の開口部の一例)を有し、さらに、円柱形状の側面に設けられたバルブ23の横に側面開口部213(第2の開口部の一例)を有する。 The anticorrosion device 2 is a cylindrical container, and is attached so as to cover the outer peripheral surface of the upper portion of the steel pipe pile 1. The anticorrosion device 2 is composed of a container portion 21, a sealing material 22 which is a joint portion, and a valve 23 which is an opening / closing portion. The container portion 21 has a cylindrical shape, has an upper opening 211 on the upper side in the drawing, a lower opening 212 (an example of the first opening) on the lower side (seabed SB side), and further has a cylindrical shape. A side opening 213 (an example of a second opening) is provided next to the valve 23 provided on the side surface of the above.

容器部21の下部側の下端位置は、海面L. W. L. (Low Water Level、朔望平均干潮面)よりも、最大波高(図中のWH)の半分以上低い位置となるように設置する。容器部21の上端位置は、鋼管杭1の海面L. W. L.と海面H. W. L.との間の干満帯に晒される部分を覆い、さらに、干満帯の上側の、波が鋼管杭1に衝突し砕けた海水飛沫を浴びる飛沫帯に晒される部分を覆うように設置する。 The lower end position on the lower side of the container portion 21 is installed so as to be at least half the maximum wave height (WH in the figure) below the sea level L.W.L. (Low Water Level). The upper end position of the container portion 21 covers the portion of the steel pipe pile 1 exposed to the tidal zone between the sea surface LWL and the sea surface HWL, and further, the wave on the upper side of the tidal zone collides with the steel pipe pile 1 and crushes the seawater droplets. Install so as to cover the part exposed to the splash zone.

図2は、防食器具2の構成を示した図である。図2(a)は上面図、図2(b)は正面図、図2(c)は底面図である。 FIG. 2 is a diagram showing the configuration of the anticorrosion device 2. 2 (a) is a top view, FIG. 2 (b) is a front view, and FIG. 2 (c) is a bottom view.

防食器具2の容器部21は、透明な円筒形状の強化プラスチックにより構成される。容器部21は、上端側に上側開口部211が形成されており、下端側に下側開口部212が形成されている。すなわち、容器部21は、上端側、下端側ともに開放された状態となっている。容器部21の円筒形状の側面には、バルブ23が取り付けられている。バルブ23は、図1に示したように、海面H. W. L.よりも上方に位置し、さらに飛沫帯より上方に位置することがより望ましい。 The container portion 21 of the anticorrosion device 2 is made of a transparent cylindrical reinforced plastic. The container portion 21 has an upper opening portion 211 formed on the upper end side and a lower opening portion 212 formed on the lower end side. That is, the container portion 21 is in an open state on both the upper end side and the lower end side. A valve 23 is attached to the cylindrical side surface of the container portion 21. As shown in FIG. 1, it is more desirable that the valve 23 is located above the sea level H.W.L. and further above the splash zone.

図3は、図2(a)におけるA-A断面を示した図である。防食器具2の容器部21の側面には、側面開口部213が形成されている。側面開口部213は、容器部21の内周面から外周面へと貫通する穴として形成されている。そして、側面開口部213の外周側にはバルブ23が取り付けられる。バルブ23は、側面開口部213を外側に対して開放したり、閉じたりするために用いられる。シール材22は、容器部21の上側開口部211の内周に沿って配置される。 FIG. 3 is a diagram showing a cross section taken along the line AA in FIG. 2A. A side opening 213 is formed on the side surface of the container 21 of the anticorrosion device 2. The side surface opening 213 is formed as a hole penetrating from the inner peripheral surface to the outer peripheral surface of the container portion 21. A valve 23 is attached to the outer peripheral side of the side opening 213. The valve 23 is used to open and close the side opening 213 to the outside. The sealing material 22 is arranged along the inner circumference of the upper opening 211 of the container portion 21.

図4は、図3の断面図のうち、バルブ23と側面開口部213の付近を拡大して示した図である。容器部21に形成された側面開口部213には、側面開口部213を覆うようにバルブ23が設けられている。バルブ23は、側面開口部213への海水の流れを制御するために側面開口部213の外側を開閉する。 FIG. 4 is an enlarged view showing the vicinity of the valve 23 and the side opening 213 in the cross-sectional view of FIG. The side opening 213 formed in the container 21 is provided with a valve 23 so as to cover the side opening 213. The valve 23 opens and closes the outside of the side opening 213 to control the flow of seawater to the side opening 213.

バルブ23は、容器部21の側面開口部213が形成された位置の外周側に円筒形状の突出管231と、突出管231内に設けられる円形の開閉弁232と、開閉弁232が回転するための回転軸となる弁軸233と、弁軸233を回転させるためのハンドル234とから構成されている。開閉弁232は、弁軸233を中心にして回転可能であり、図4に示すような円形面が紙面に垂直方向となっている位置では、突出管231内を海水が流れるのを止めることができる。開閉弁232の円形面が紙面の垂直方向に対して傾きを持つ位置では、開閉弁232の外周と突出管231の内周面との間に隙間ができ、海水が流れる状態となる。 The valve 23 has a cylindrical protruding pipe 231 on the outer peripheral side of the position where the side opening 213 of the container portion 21 is formed, a circular on-off valve 232 provided in the protruding pipe 231, and an on-off valve 232 to rotate. It is composed of a valve shaft 233 which is a rotation shaft of the above and a handle 234 for rotating the valve shaft 233. The on-off valve 232 can rotate about the valve shaft 233, and at a position where the circular surface is perpendicular to the paper surface as shown in FIG. 4, it is possible to stop the seawater from flowing in the protruding pipe 231. can. At a position where the circular surface of the on-off valve 232 is inclined with respect to the vertical direction of the paper surface, a gap is formed between the outer periphery of the on-off valve 232 and the inner peripheral surface of the protruding pipe 231, and seawater flows.

ハンドル234は、弁軸233と結合されており、ハンドル234を回転させることにより、弁軸233、開閉弁232を回転させることができる。作業者は、ハンドル234を回転操作することにより、開閉弁232を回転させることができ、開閉弁232の位置を、海水の流れを止める位置(以下、閉状態という)と、海水が流れる状態にする位置(以下、開状態という)とを切り換えることができる。 The handle 234 is coupled to the valve shaft 233, and the valve shaft 233 and the on-off valve 232 can be rotated by rotating the handle 234. The operator can rotate the on-off valve 232 by rotating the handle 234, and the position of the on-off valve 232 is set to a position where the flow of seawater is stopped (hereinafter referred to as a closed state) and a state where seawater flows. It is possible to switch between the position to be used (hereinafter referred to as the open state).

突出管231の側面開口部213との反対側は、開口しており、開閉弁232が開状態の位置であるときは、海水は、容器部21の内周側から側面開口部213を介して突出管231から外側へ流れ出ることができる。なお、開閉弁232が閉状態となっているときには、突出管231の外側開口にゴム製等の閉塞用キャップを設置しても良い。 The side of the protruding pipe 231 opposite to the side opening 213 is open, and when the on-off valve 232 is in the open position, seawater flows from the inner peripheral side of the container 21 via the side opening 213. It can flow out from the protruding pipe 231. When the on-off valve 232 is in the closed state, a closing cap made of rubber or the like may be installed in the outer opening of the protruding pipe 231.

図5は、防食器具2を構成するシール材22が容器部21に取り付けられ、さらに、防食器具2が鋼管杭1に取り付けられた状態を示した図である。図5(a)は、容器部21に対してシール材22が取り付けられる様子を示した図である。作業者は、ドーナツ形状のシール材22の外周側に水密封止を行うための塗材であるシーラーを塗る。そして、シール材22を容器部21の上側開口部211に嵌め込み、シール材22を上側開口部211の内周面に接着させる。 FIG. 5 is a diagram showing a state in which the sealing material 22 constituting the anticorrosion device 2 is attached to the container portion 21, and the anticorrosion device 2 is further attached to the steel pipe pile 1. FIG. 5A is a diagram showing how the sealing material 22 is attached to the container portion 21. The operator applies a sealer, which is a coating material for watertight sealing, to the outer peripheral side of the donut-shaped sealing material 22. Then, the sealing material 22 is fitted into the upper opening 211 of the container portion 21, and the sealing material 22 is adhered to the inner peripheral surface of the upper opening 211.

図5(b)は、鋼管杭1に対して、シール材22が取り付けられた容器部21が取り付けられる様子を示した図である。作業者は、シール材22の内周側にシーラーを塗る。そして、鋼管杭1の天端から容器部21を被せ、適切な位置でシール材22を鋼管杭1の外周面に接着させる。このようにして、防食器具2の容器部21が鋼管杭1に取り付けられる。この際に、シール材22は、鋼管杭1と容器部21を接合する接合部としての役割を果たす。 FIG. 5B is a diagram showing how the container portion 21 to which the sealing material 22 is attached is attached to the steel pipe pile 1. The operator applies a sealer to the inner peripheral side of the sealing material 22. Then, the container portion 21 is covered from the top end of the steel pipe pile 1, and the sealing material 22 is adhered to the outer peripheral surface of the steel pipe pile 1 at an appropriate position. In this way, the container portion 21 of the anticorrosion device 2 is attached to the steel pipe pile 1. At this time, the sealing material 22 serves as a joint portion for joining the steel pipe pile 1 and the container portion 21.

図5(c)は、鋼管杭1に防食器具2が取り付けられた状態を示した図である。シール材22を鋼管杭1に接着させる位置は、シール材22が取り付けられた容器部21の上側開口部211を鋼管杭1の天端が上方へ突き抜け、鋼管杭1が容器部21を貫通した位置である。シール材22は、鋼管杭1が海底SBに打設された状態における海面H. W. L.より高い位置に取り付けられ、飛沫帯より高い位置に取り付けられることがより望ましい。 FIG. 5C is a diagram showing a state in which the anticorrosion device 2 is attached to the steel pipe pile 1. At the position where the sealing material 22 is adhered to the steel pipe pile 1, the top end of the steel pipe pile 1 penetrates upward through the upper opening 211 of the container portion 21 to which the sealing material 22 is attached, and the steel pipe pile 1 penetrates the container portion 21. The position. It is more desirable that the sealing material 22 is attached at a position higher than the sea surface H.W.L. in a state where the steel pipe pile 1 is placed on the seabed SB, and is attached at a position higher than the splash zone.

図6は、本実施形態に係る防食器具2を鋼管杭1に取り付けて、防食処理を施す工程を示したフローチャートである。図7乃至図11は、防食処理を施す工程を説明するための図である。 FIG. 6 is a flowchart showing a process of attaching the anticorrosion device 2 according to the present embodiment to the steel pipe pile 1 and performing the anticorrosion treatment. 7 to 11 are diagrams for explaining a process of applying anticorrosion treatment.

まず、鋼管杭1を海底SBに打設して設置する(ステップS601)。図7は、海底SBに打設された複数の鋼管杭1を示している。続いて、作業者は、防食器具2の容器部21にシール材22を取り付ける(ステップS602)。作業者は、シール材22の外周側にシーラーを塗り、容器部21の上側開口部211の内周面にシール材22を取り付けて接着させる。 First, the steel pipe pile 1 is placed and installed on the seabed SB (step S601). FIG. 7 shows a plurality of steel pipe piles 1 placed on the seabed SB. Subsequently, the operator attaches the sealing material 22 to the container portion 21 of the anticorrosion device 2 (step S602). The operator applies a sealer to the outer peripheral side of the sealing material 22, and attaches and adheres the sealing material 22 to the inner peripheral surface of the upper opening 211 of the container portion 21.

続いて、作業者は、鋼管杭1の上部に防食器具2を設置する(ステップS603)。シール材22の内周側にシーラーを塗り、防食器具2を鋼管杭1に天端側から被せ、鋼管杭1に天端が防食器具2の容器部21の上側開口部211を突き抜ける状態とする。そして、シール材22の内周側が鋼管杭1の外周面に接触し、シーラーによって接合される状態とする。以上のようにして、防食器具2は、シール材22を介して鋼管杭1に接合される。
図8は、複数の鋼管杭1の上部の各々に防食器具2が被せられて接合された状態を示している。
Subsequently, the worker installs the anticorrosion device 2 on the upper part of the steel pipe pile 1 (step S603). A sealer is applied to the inner peripheral side of the sealing material 22, and the anticorrosion device 2 is covered with the steel pipe pile 1 from the top end side so that the top end of the steel pipe pile 1 penetrates the upper opening 211 of the container portion 21 of the anticorrosion device 2. .. Then, the inner peripheral side of the sealing material 22 comes into contact with the outer peripheral surface of the steel pipe pile 1 and is joined by a sealer. As described above, the anticorrosion device 2 is joined to the steel pipe pile 1 via the sealing material 22.
FIG. 8 shows a state in which the anticorrosion device 2 is covered and joined to each of the upper portions of the plurality of steel pipe piles 1.

続いて、作業者は、鋼管杭1の上部に支保工3を設置する(ステップS604)。図9は、複数の鋼管杭1に対して支保工3を設置した状態を示している。支保工3は、上部工コンクリートを打設する際に使用する型枠を支持するための仮設構造物である。続いて、作業者は、支保工3上に型枠を設置し(ステップS605)、上部工コンクリート4を打設する(ステップS606)。続いて、作業者は、型枠を取り外す(ステップS607)。図10は、支保工3上に上部工コンクリート4が構築された状態を示している。 Subsequently, the worker installs the support 3 on the upper part of the steel pipe pile 1 (step S604). FIG. 9 shows a state in which the support work 3 is installed for a plurality of steel pipe piles 1. The support work 3 is a temporary structure for supporting the formwork used when placing the superstructure concrete. Subsequently, the worker installs the formwork on the support work 3 (step S605) and places the superstructure concrete 4 (step S606). Subsequently, the worker removes the formwork (step S607). FIG. 10 shows a state in which the superstructure concrete 4 is constructed on the support work 3.

続いて、作業者は、防食器具2の容器部21内のバルブ23より空気を吸い出して、容器部21内に海水を揚水する処理を行う(ステップS608)。続いて、作業者は、鋼管杭1の防食器具2で覆われた部分の下方の海水に浸かった位置に電気防食陽極5を取り付ける処理を行う(ステップS609)。図11は、複数の鋼管杭1の各々に電気防食陽極を取り付けた状態を示している。 Subsequently, the operator sucks air from the valve 23 in the container portion 21 of the anticorrosion device 2 and pumps seawater into the container portion 21 (step S608). Subsequently, the operator performs a process of attaching the electric anticorrosion anode 5 to a position submerged in seawater below the portion of the steel pipe pile 1 covered with the anticorrosion device 2 (step S609). FIG. 11 shows a state in which an electrocorrosion-proof anode is attached to each of the plurality of steel pipe piles 1.

図12は、図6のフローチャートにおけるステップS608の容器部21内の海水を揚水する処理を説明するための図である。 FIG. 12 is a diagram for explaining a process of pumping seawater in the container portion 21 of step S608 in the flowchart of FIG.

図12(a)は、揚水を開始する前の状態を示している。バルブ23は開状態となっており、側面開口部213は開放された状態である。この場合、容器部21内の海水面は、容器部21の外側の海水面と同じ高さとなる。この状態で、作業者は、バルブ23の外側からポンプPを取り付ける。そして、作業者はポンプPを作動させる。 FIG. 12A shows a state before the start of pumping. The valve 23 is in the open state, and the side opening 213 is in the open state. In this case, the sea level inside the container 21 is the same as the sea level outside the container 21. In this state, the operator attaches the pump P from the outside of the valve 23. Then, the operator operates the pump P.

図12(b)は、ポンプPが作動して、側面開口部213から容器部21内の空気が吸い出されている状態を示している。ここで、「容器部21内」とは、容器部21の内周面と鋼管杭1の外周面とシール材22とで囲まれた空間内を意味する。ポンプPにより、容器部21内の空気が吸い出されることにより、容器部21内は負圧がかけられた状態となり、容器部21内の海水面が上昇する。 FIG. 12B shows a state in which the pump P is operated and the air in the container portion 21 is sucked out from the side opening portion 213. Here, "inside the container portion 21" means the inside of the space surrounded by the inner peripheral surface of the container portion 21, the outer peripheral surface of the steel pipe pile 1, and the sealing material 22. By sucking out the air in the container portion 21 by the pump P, a negative pressure is applied to the inside of the container portion 21, and the sea level in the container portion 21 rises.

海水面が側面開口部213の位置まで上昇すると、側面開口部213から外部へと海水が流れ出す。この状態になったとき、作業者は、バルブ23のハンドル234を操作して、バルブ23を閉状態とする。そして、作業者は、ポンプPの作動を止める。そうすると、外部へと流れ出そうとしていた海水が逆流して、側面開口部213から容器部21内へと流れようとする。しかしながら、バルブ23の開閉弁232の働きにより、側面開口部213は閉鎖され、容器部21内には一定の負圧がかかった状態となり、逆流する海水は止められる。この状態で、作業者は、バルブ23からポンプPを外す。なお、容器部21内に負圧が生じた状態となっていることを確認できたら、突出管231の外側開口にゴム製等の閉塞用キャップを設置しても良い。 When the sea level rises to the position of the side opening 213, seawater flows out from the side opening 213. When this state is reached, the operator operates the handle 234 of the valve 23 to close the valve 23. Then, the operator stops the operation of the pump P. Then, the seawater that was about to flow out flows back and tries to flow from the side opening 213 into the container portion 21. However, due to the action of the on-off valve 232 of the valve 23, the side opening 213 is closed, a constant negative pressure is applied to the inside of the container 21, and the backflowing seawater is stopped. In this state, the operator removes the pump P from the valve 23. If it can be confirmed that a negative pressure is generated in the container portion 21, a closing cap made of rubber or the like may be installed in the outer opening of the protruding pipe 231.

その結果、容器部21内が、飛沫帯より高い位置まで常時海水で満たされることになる。図12(c)は、容器部21内の海水面が側面開口部213の位置まで上昇した状態で、バルブ23が閉状態となっている状態を示している。 As a result, the inside of the container portion 21 is constantly filled with seawater up to a position higher than the splash zone. FIG. 12 (c) shows a state in which the valve 23 is in a closed state with the sea level in the container portion 21 rising to the position of the side opening portion 213.

以上説明したような実施形態によれば、以下のような効果が得られる。
(1)防食器具2により、鋼管杭1の干満帯、飛沫帯に対応する表面部分を覆い、それらの部分を常時海水で満たすことができる。その結果、干満帯、飛沫帯の部分に関しても、常に海面下にあって海水に浸されている部分と同様の環境下に置かれることになり、腐食の進行が低減される。また、電気防食が施される場合、その効果によりさらに腐食が抑えられる。なお、防食器具2の内周面と鋼管杭1の外周面との間の隙間は、少なくとも1mm以上であればよい。
According to the embodiment as described above, the following effects can be obtained.
(1) The anticorrosion device 2 can cover the surface portions of the steel pipe pile 1 corresponding to the tidal zone and the splash zone, and can always fill those portions with seawater. As a result, the tidal zone and the splash zone are always placed under the same environment as the part that is under the sea surface and is submerged in seawater, and the progress of corrosion is reduced. Further, when the electric corrosion protection is applied, the effect further suppresses the corrosion. The gap between the inner peripheral surface of the anticorrosion device 2 and the outer peripheral surface of the steel pipe pile 1 may be at least 1 mm or more.

(2)防食器具2の容器部21が透明なプラスチック製であるので、ポンプPを用いて容器部21内に海水を揚水する際に、容器部21内に海水が満たされている様子が確認できる。また、施工後においても、海水が満たされている様子が確認でき、さらに、透明な容器部21を介して鋼管杭1の表面が視認できるため、施工後に鋼管杭1の腐食が生じていないことを、あるいは腐食が生じている場合は腐食の程度を確認することができる。 (2) Since the container portion 21 of the anticorrosion device 2 is made of transparent plastic, it is confirmed that the container portion 21 is filled with seawater when pumping seawater into the container portion 21 using the pump P. can. Further, even after the construction, it can be confirmed that the seawater is filled, and the surface of the steel pipe pile 1 can be visually recognized through the transparent container portion 21, so that the steel pipe pile 1 is not corroded after the construction. Or, if corrosion has occurred, the degree of corrosion can be confirmed.

(3)施工後に、容器部21に汚れが付着して、鋼管杭1が視認しにくくなった場合には、バルブ23を開状態にして容器部21内の海水を抜いた後に容器部21の内側と外側を洗浄することができる。そして、再度容器部21内の海水の揚水を行って、容器部21内を海水で満たした状態に回復することができる。 (3) If the steel pipe pile 1 becomes difficult to see due to dirt adhering to the container portion 21 after construction, the valve 23 is opened, the seawater in the container portion 21 is drained, and then the container portion 21 is used. The inside and outside can be cleaned. Then, the seawater in the container portion 21 can be pumped up again to restore the inside of the container portion 21 to a state of being filled with seawater.

(4)従来のように、鋼管杭の上部に重防食被覆を施した場合(鋼管杭の干満帯、飛沫帯に対応する部分をポリエチレンあるいはポリウレタン等で被覆した場合)と比べて、施工時に鋼管杭の打設の際の低止まり又は高止まりが生じた場合に、本実施形態には以下のような効果がある。 (4) Compared to the case where the heavy anticorrosion coating is applied to the upper part of the steel pipe pile as in the past (when the part corresponding to the tidal zone and the splash zone of the steel pipe pile is covered with polyethylene or polyurethane), the steel pipe is constructed at the time of construction. This embodiment has the following effects when a low stop or a high stop occurs when the pile is driven.

低止まりが生じた場合、すなわち、鋼管杭の打設後に、所望の支持力が得られなかった場合であり、想定の打設深度よりも深い位置まで打設する場合、海面に対して鋼管杭の天端の高さが想定していた高さより低くなる。このため、鋼管杭の天端の上に継ぎ杭を溶接した後に、さらに工事現場で継ぎ杭した部分に重防食を施す必要が生じる。
このような場合でも、本実施形態によれば、継ぎ杭を溶接した後に、継ぎ杭の部分の上から防食器具2の容器部21を被せればよいので、継ぎ杭を施す以外に工程が増えることがない。
When a low stop occurs, that is, when the desired bearing capacity is not obtained after the steel pipe pile is driven, and when the steel pipe pile is driven to a position deeper than the expected driving depth, the steel pipe pile is placed with respect to the sea surface. The height of the top of the stake is lower than expected. Therefore, after welding the joint pile on the top end of the steel pipe pile, it is necessary to further apply heavy corrosion protection to the joint pile portion at the construction site.
Even in such a case, according to the present embodiment, after welding the joint pile, it is sufficient to cover the container portion 21 of the anticorrosion device 2 from the portion of the joint pile, so that the number of steps is increased other than the joint pile. Never.

また、高止まりが生じた場合、すなわち、鋼管杭の打設の際に、想定した深さまで鋼管杭を打ち込めなかった場合、海面に対して鋼管杭の天端の高さが想定していた高さより高くなる。このため、鋼管杭の上部を切断して高さを低くすることになる。この場合、重防食を施した部分が切断されてしまうため、切断した後の鋼管杭の上部の必要な範囲を満たすように、工事現場で重防食を施す必要が生じる。
このような場合でも、本実施形態によれば、切断された後の鋼管杭の天端の上から防食器具2の容器部21を被せればよいので、鋼管杭の上部の切断以外に工程が増えることがない。
In addition, when a high stop occurs, that is, when the steel pipe pile cannot be driven to the expected depth when driving the steel pipe pile, the height of the top of the steel pipe pile with respect to the sea surface is the expected height. It will be higher than that. Therefore, the upper part of the steel pipe pile is cut to lower the height. In this case, since the portion subjected to heavy corrosion protection is cut, it is necessary to provide heavy corrosion protection at the construction site so as to satisfy the required range of the upper part of the steel pipe pile after cutting.
Even in such a case, according to the present embodiment, since the container portion 21 of the anticorrosion device 2 may be covered from above the top end of the steel pipe pile after being cut, a process other than cutting the upper portion of the steel pipe pile can be performed. It will not increase.

[変形例]
上述の実施形態は様々に変形され得る。以下に、それらの変形の例を示す。なお、以下に示す2以上の変形例が適宜組み合わされてもよい。
[Modification example]
The above embodiments can be modified in various ways. An example of these variations is shown below. In addition, two or more modification examples shown below may be combined appropriately.

(1)上述の実施形態においては、防食器具2の容器部21は、強化プラスチックを材料として構成されるものとしたが、鋼材で構成されるものとしてもよい。
図13は、変形例に係る防食器具250を鋼管杭1に取り付けた状態を示した図である。海底SBに打設された鋼管杭1は上述の実施形態と同様の部材である。防食器具250は、容器部251およびバルブ253とから構成されている。
(1) In the above-described embodiment, the container portion 21 of the anticorrosion device 2 is made of reinforced plastic as a material, but may be made of a steel material.
FIG. 13 is a diagram showing a state in which the anticorrosion device 250 according to the modified example is attached to the steel pipe pile 1. The steel pipe pile 1 placed on the seabed SB is a member similar to that of the above-described embodiment. The anticorrosion device 250 is composed of a container portion 251 and a valve 253.

容器部251は、上述の実施形態の容器部21と同様の形状であるが、鋼材により構成されている。容器部251には、上述の実施形態の容器部21と同様に、上側開口部2511、下側開口部2512、および側面開口部2513が設けられている。バルブ253は、上述の実施形態とバルブ23と同様の部材である。上述の実施形態と同様に、容器部251の下部側の下端位置は、海面L. W. L.よりも最大波高の半分(WH/2)以上低い位置となるように設置される。 The container portion 251 has the same shape as the container portion 21 of the above-described embodiment, but is made of a steel material. The container portion 251 is provided with an upper opening 2511, a lower opening 2512, and a side opening 2513, similarly to the container portion 21 of the above-described embodiment. The valve 253 is a member similar to the above-described embodiment and the valve 23. Similar to the above-described embodiment, the lower end position on the lower side of the container portion 251 is installed so as to be lower than the sea surface L.W.L. by half (WH / 2) or more of the maximum wave height.

打設された鋼管杭1に対して鋼管杭1の天端から下側開口部2512、上側開口部2511を介して防食器具250を嵌め込み、所定の位置で仮止めした後に、上側開口部2511の内周面と鋼管杭1の外周面とを溶接で剛接合することで、鋼材で構成された防食器具250を鋼管杭1に取り付けることができる。 The anticorrosion device 250 is fitted into the cast steel pipe pile 1 from the top end of the steel pipe pile 1 via the lower opening 2512 and the upper opening 2511, temporarily fixed at a predetermined position, and then the upper opening 2511. By rigidly joining the inner peripheral surface and the outer peripheral surface of the steel pipe pile 1 by welding, the anticorrosion device 250 made of steel can be attached to the steel pipe pile 1.

以上説明したような変形例によれば、以下のような効果が得られる。
図9~図11に示したように、鋼管杭の上に上部工コンクリート4を打設するためには支保工3が必要となる。この変形例においては、防食器具250の容器部251が鋼製であるため、通常鋼管杭に溶接して設置する支保工を容器部251に溶接して設置することができる。図14は、容器部251の外面にブラケット61を溶接し、そのブラケット61の上に鋼材62を載せることで支保工6を形成する例を示している。図9と図14を比較すると明らかなように、支保工を容器部251に溶接することで、支保工に要する鋼材の数量を少なくすることができる。
According to the modification as described above, the following effects can be obtained.
As shown in FIGS. 9 to 11, a support 3 is required to place the superstructure concrete 4 on the steel pipe pile. In this modification, since the container portion 251 of the anticorrosion device 250 is made of steel, the support work normally installed by welding to the steel pipe pile can be welded to the container portion 251 and installed. FIG. 14 shows an example in which a support work 6 is formed by welding a bracket 61 to the outer surface of a container portion 251 and placing a steel material 62 on the bracket 61. As is clear from a comparison between FIGS. 9 and 14, the number of steel materials required for the support can be reduced by welding the support to the container portion 251.

(2)上述の実施形態においては、工事現場においてシール材22を防食器具2に取り付けた後で、鋼管杭1にシール材22と防食器具2の容器部21を接合するものとしたが、防食器具2の容器部21に予めシール材22を取り付けておいてもよい。この場合、シール材22の外周にシーラーを塗り、上側開口部211の内周面に接着しておく。そして、容器部21を設置する際に容器部21に取り付けられたシール材22の内周にシーラーを塗り、容器部21を鋼管杭1に貫通させ、シール材22の内周側と鋼管杭1の外周面とを接着させる。このようにすることにより、工事現場にて、鋼管杭1にシール材22を取り付ける作業が削減される。 (2) In the above-described embodiment, after the sealing material 22 is attached to the anticorrosion device 2 at the construction site, the sealing material 22 and the container portion 21 of the anticorrosion device 2 are joined to the steel pipe pile 1. The sealing material 22 may be attached to the container portion 21 of the instrument 2 in advance. In this case, a sealer is applied to the outer periphery of the sealing material 22 and adhered to the inner peripheral surface of the upper opening 211. Then, when installing the container portion 21, a sealer is applied to the inner circumference of the sealing material 22 attached to the container portion 21, the container portion 21 is passed through the steel pipe pile 1, and the inner peripheral side of the sealing material 22 and the steel pipe pile 1 are formed. Adhere to the outer peripheral surface of the. By doing so, the work of attaching the sealing material 22 to the steel pipe pile 1 at the construction site is reduced.

(3)上述の実施形態において、容器部21は一体となった形状のものとしたが、垂直方向に複数に分割し、各分割部材を溶接、ボルト等により一体化させるようにしてもよい。一体化した際に接合面に隙間が生じず側面開口部213から負圧をかけた際に圧が漏れ出なければ、容器部21を複数の部材から構成するようにしてもよい。 (3) In the above-described embodiment, the container portion 21 has an integrated shape, but it may be divided into a plurality of parts in the vertical direction, and each divided member may be integrated by welding, bolts, or the like. If the joint surface does not have a gap when integrated and the pressure does not leak when a negative pressure is applied from the side opening 213, the container portion 21 may be composed of a plurality of members.

1…鋼管杭、2…防食器具、3…支保工、4…上部工コンクリート、5…電気防食陽極、6…支保工、21…容器部、22…シール材(接合部)、23…バルブ(開閉部)、61…ブラケット、62…鋼材、211…上側開口部、212…下側開口部、213…側面開口部、231…突出管、232…開閉弁、233…弁軸、234…ハンドル、250…防食器具、251…容器部、253…バルブ、2511…上側開口部、2512…下側開口部、2513…側面開口部、H. W. L. …朔望平均満潮面、L. W. L. …朔望平均干潮面、SB…海底。 1 ... Steel pipe pile, 2 ... Anticorrosion equipment, 3 ... Support work, 4 ... Superstructure concrete, 5 ... Electric anticorrosion anode, 6 ... Support work, 21 ... Container part, 22 ... Sealing material (joint part), 23 ... Valve ( Opening and closing part), 61 ... Bracket, 62 ... Steel material, 211 ... Upper opening, 212 ... Lower opening, 213 ... Side opening, 231 ... Protruding pipe, 232 ... Opening and closing valve, 233 ... Valve shaft, 234 ... Handle, 250 ... Anticorrosion equipment, 251 ... Container, 253 ... Valve, 2511 ... Upper opening, 2512 ... Lower opening, 2513 ... Side opening, HWL ... Sakubo average high tide surface, LWL ... Sakubo average low tide surface, SB ... Seabed ..

Claims (8)

海底に打設され天端が海水面より上に露出している鋼管杭の一部を覆う防食器具であって、
前記鋼管杭と接合される接合部と、
前記接合部により前記鋼管杭に取り付けられた状態において、L. W. L.より最大波高の半分以上低い位置において海水と通じる第1の開口部と、H. W. L.より高い位置において大気と通じる第2の開口部とを有し、前記鋼管杭の少なくとも飛沫帯に晒される部分を覆う容器部と、
前記第2の開口部を開閉する開閉部と
を備える鋼材の防食器具。
It is an anticorrosion device that covers a part of the steel pipe pile that is placed on the seabed and the top is exposed above the sea surface.
The joint to be joined to the steel pipe pile and
When attached to the steel pipe pile by the joint, it has a first opening that communicates with seawater at a position that is at least half the maximum wave height below the LWL and a second opening that communicates with the atmosphere at a position higher than the HWL. Then, the container portion that covers at least the portion of the steel pipe pile exposed to the splash zone, and the container portion.
A steel anticorrosion device provided with an opening / closing portion for opening / closing the second opening.
前記容器部は、前記開閉部により前記第2の開口部が閉鎖された状態で、前記容器部の内周面と前記鋼管杭の外周面の間の空間に、前記容器部の外側の海水面より高い水位の海水を保持する
請求項1に記載の防食器具。
With the second opening closed by the opening / closing portion, the container portion has a seawater surface outside the container portion in the space between the inner peripheral surface of the container portion and the outer peripheral surface of the steel pipe pile. The anticorrosion device according to claim 1, which holds seawater at a higher water level.
前記接合部は前記接合部で前記鋼管杭に溶接される鋼製である
請求項1又は2に記載の防食器具。
The anticorrosion device according to claim 1 or 2, wherein the joint is made of steel that is welded to the steel pipe pile at the joint.
前記容器部はプラスチック製であり、
前記接合部はシール材を有する
請求項1又は2に記載の防食器具。
The container is made of plastic
The anticorrosion device according to claim 1 or 2, wherein the joint has a sealing material.
前記容器部は透明な強化プラスチック製である
請求項4に記載の防食器具。
The anticorrosion device according to claim 4, wherein the container portion is made of transparent reinforced plastic.
海底に打設され天端が海水面より上に露出している鋼管杭に、L. W. L.より最大波高の半分以上低い位置において海水と通じる第1の開口部と、H. W. L.より高い位置において大気と通じる第2の開口部とを有する容器部を備える防食器具を接合部により接合し、前記容器部で前記鋼管杭の少なくとも飛沫帯に晒される部分を覆う状態に設置するステップと、
前記第2の開口部から前記容器部内の空気を吸い出し、前記容器部の内周面と前記鋼管杭の外周面の間の空間に、前記容器部の外側の海水面より高い水位まで揚水するステップと、
前記容器部の内周面と前記鋼管杭の外周面の間の空間内の水位が前記容器部の外側の海水面より高い状態において前記第2の開口部を閉鎖するステップと
を備える鋼管杭の防食方法。
A steel pipe pile that is placed on the seabed and whose top is exposed above the sea surface has a first opening that communicates with seawater at a position that is more than half the maximum wave height below LWL, and a second that communicates with the atmosphere at a position higher than HWL. A step of joining an anticorrosion device having a container portion having an opening of 2 by a joint portion and installing the container portion so as to cover at least a portion of the steel pipe pile exposed to a splash zone.
A step of sucking air in the container portion from the second opening and pumping water into the space between the inner peripheral surface of the container portion and the outer peripheral surface of the steel pipe pile to a water level higher than the sea level outside the container portion. When,
A steel pipe pile including a step of closing the second opening when the water level in the space between the inner peripheral surface of the container portion and the outer peripheral surface of the steel pipe pile is higher than the sea level outside the container portion. Anticorrosion method.
前記接合部は鋼製であり、
前記設置するステップは、前記接合部を前記鋼管杭に溶接するステップを含む
請求項6に記載の防食方法。
The joint is made of steel
The anticorrosion method according to claim 6, wherein the installation step includes a step of welding the joint portion to the steel pipe pile.
前記容器部は強化プラスチック製であり、
前記設置するステップは、前記接合部が有するシール材で前記鋼管杭をシールするステップを含む
請求項6に記載の防食方法。
The container is made of reinforced plastic and is made of reinforced plastic.
The anticorrosion method according to claim 6, wherein the step to be installed includes a step of sealing the steel pipe pile with the sealing material of the joint.
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JPS498777B1 (en) * 1970-01-22 1974-02-28
JPS52152603A (en) * 1976-06-14 1977-12-19 Bridgestone Tire Co Ltd Antiicorrosive cover for steel pipe pile
JPS5565371A (en) * 1978-11-11 1980-05-16 Yamauchi Rubber Ind Co Ltd Corrosion preventing method for steel tube pile for water equipment support
JPS55142810A (en) * 1979-04-20 1980-11-07 Nippon Sheet Glass Co Ltd Forming of cement mortar layer outside underwater structure
JPS61112613A (en) * 1984-11-08 1986-05-30 Nippon Kokan Kk <Nkk> Corrosion resistant covering process for ocean structure
JPS62258022A (en) * 1986-04-30 1987-11-10 Showa Highpolymer Co Ltd Construction work of water-curing type anticorrosive material
JPH02120541U (en) * 1989-03-16 1990-09-28
JP2006125050A (en) * 2004-10-28 2006-05-18 Yoshiyuki Ogushi Corrosion preventive material construction mold and corrosion preventive structure and corrosion preventive method for steel pipe pile by use of it
JP2011184957A (en) * 2010-03-09 2011-09-22 Sumitomo Metal Ind Ltd Anticorrosion steel pipe pile and method of constructing the same

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS498777B1 (en) * 1970-01-22 1974-02-28
JPS52152603A (en) * 1976-06-14 1977-12-19 Bridgestone Tire Co Ltd Antiicorrosive cover for steel pipe pile
JPS5565371A (en) * 1978-11-11 1980-05-16 Yamauchi Rubber Ind Co Ltd Corrosion preventing method for steel tube pile for water equipment support
JPS55142810A (en) * 1979-04-20 1980-11-07 Nippon Sheet Glass Co Ltd Forming of cement mortar layer outside underwater structure
JPS61112613A (en) * 1984-11-08 1986-05-30 Nippon Kokan Kk <Nkk> Corrosion resistant covering process for ocean structure
JPS62258022A (en) * 1986-04-30 1987-11-10 Showa Highpolymer Co Ltd Construction work of water-curing type anticorrosive material
JPH02120541U (en) * 1989-03-16 1990-09-28
JP2006125050A (en) * 2004-10-28 2006-05-18 Yoshiyuki Ogushi Corrosion preventive material construction mold and corrosion preventive structure and corrosion preventive method for steel pipe pile by use of it
JP2011184957A (en) * 2010-03-09 2011-09-22 Sumitomo Metal Ind Ltd Anticorrosion steel pipe pile and method of constructing the same

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