JP6266821B2

JP6266821B2 - Deadline structure and deadline method

Info

Publication number: JP6266821B2
Application number: JP2017047359A
Authority: JP
Inventors: 山下　徹; 徹山下; 浩一朗安野; 慎塚本; 敦夫木井
Original assignee: Penta Ocean Construction Co Ltd
Current assignee: Penta Ocean Construction Co Ltd
Priority date: 2017-03-13
Filing date: 2017-03-13
Publication date: 2018-01-24
Anticipated expiration: 2037-03-13
Also published as: JP2017166314A

Description

本発明は、水中構造物周囲の水中部にドライな作業空間を形成する技術に関する。 The present invention relates to a technique for forming a dry work space in an underwater portion around an underwater structure.

水中構造物の周囲を止水壁で囲い、水中構造物周囲の水中部にドライな作業空間を形成する技術が知られている。例えば、特許文献１には、水中構造物の水面下にある床台の上に所定の間隔で立設された複数の支柱の間に分割止水プレートを挿入し、締結手段で床台と分割止水プレートの間、及び、支柱と分割止水プレートの間の少なくとも一方を止水用のシール材を介在して締結して締切用壁体を構築した後、締切用壁体の内側の水を排水することで、水中構造物周囲の水中部にドライな作業空間を形成する技術が提案されている。 2. Description of the Related Art A technique is known in which a periphery of an underwater structure is surrounded by a water blocking wall and a dry work space is formed in an underwater portion around the underwater structure. For example, in Patent Document 1, a split water stop plate is inserted between a plurality of support columns erected at a predetermined interval on a floor base under the water surface of an underwater structure, and is divided from the floor base by fastening means. After constructing a shutoff wall body by fastening at least one of the waterstop plates and between the support column and the split waterstop plate with a sealant for waterstop, water inside the shutoff wall body A technique for forming a dry work space in an underwater area around an underwater structure has been proposed.

特開２０１３−１０８３１６号公報JP 2013-108316 A

沿岸部や河川等の流れのある水中において、例えば既設の橋脚周りの補修、補強等のために、作業対象の水中構造物の周囲に所望のドライな作業空間を確保したい場合がある。流れのある水中において特許文献１に記載の発明を用いると、床台の上に立設された支柱に対し作業空間の外側から作用する静水圧のみでなく、水流による力（流体力）も加わる。その結果、支柱がその合力に抗しきれず、締切用壁体が容易に破損してしまう、という問題がある。 In submerged water such as coastal areas and rivers, for example, there is a case where a desired dry work space is desired to be secured around an underwater structure to be worked for, for example, repair and reinforcement around an existing pier. When the invention described in Patent Document 1 is used in flowing water, not only the hydrostatic pressure acting from the outside of the work space but also the force (fluid force) due to the water flow is applied to the support column erected on the floor base. . As a result, there is a problem that the column cannot resist the resultant force and the wall for closing is easily damaged.

本発明は、上記の事情に鑑み、流れのある水中において、水中構造物周囲の水中部にドライな作業空間を確保する手段を提供することを目的とする。 In view of the above circumstances, an object of the present invention is to provide means for ensuring a dry work space in an underwater portion around an underwater structure in flowing water.

上記の目的を達成するため、本発明は、水中構造物周囲の水中部にドライな作業空間を形成する締切構造物であって、前記作業空間に外側から作用する流体力を減勢する築堤と、前記築堤の内側に間隔をあけて配置され、前記作業空間の少なくとも下面の高さから上に向かい延伸する複数の縦部材と、前記複数の縦部材のうち隣り合う２本の間に各々挿入され、内部に水を収容できる中空の函体である複数の止水壁とを備え、前記複数の縦部材は前記複数の止水壁を起立した状態で支持する締切構造物を第１の態様として提案する。 In order to achieve the above object, the present invention provides a deadline structure that forms a dry work space in an underwater portion around an underwater structure, and a embankment that reduces fluid force acting on the work space from the outside. A plurality of vertical members arranged at intervals inside the embankment and extending upward from a height of at least the lower surface of the work space, and inserted between two adjacent ones of the plurality of vertical members. And a plurality of water blocking walls that are hollow boxes capable of containing water therein , wherein the plurality of vertical members support a cutoff structure that supports the plurality of water blocking walls in a standing state. Propose as.

上記の第１の態様に係る締切構造物によれば、築堤により流体力が減勢された環境下に配置された縦部材により止水壁が支持されるため、流れのある水中においても、水中構造物周囲の水中部にドライな作業空間を確保することができる。また、止水壁が軽量な中空の函体であるため、その配置の作業が容易である。 According to the deadline structure according to the first aspect, the water blocking wall is supported by the vertical member disposed in the environment where the fluid force is reduced by the embankment. A dry work space can be secured in the underwater area around the structure. Moreover, since the water blocking wall is a lightweight hollow box, the arrangement work is easy.

また、上記の第１の態様に係る締切構造物において、前記縦部材と一体化されたフレームを構成する横部材と斜部材とを備え、前記作業空間をドライにした状態において、前記フレーム及び前記止水壁が前記水中構造物からの反力を受けることなく自立する、という構成が本発明の第２の態様として採用されてもよい。 The deadline structure according to the first aspect further includes a horizontal member and a slant member constituting a frame integrated with the vertical member, and in the state where the working space is dry, the frame and the A configuration in which the water blocking wall is self-supporting without receiving a reaction force from the underwater structure may be employed as the second aspect of the present invention.

上記の第２の態様に係る締切構造物によれば、縦部材と水中構造物の間に切梁を配置する必要がなく、作業性の高い作業空間が確保される。 According to the deadline structure according to the second aspect described above, it is not necessary to arrange a beam between the vertical member and the underwater structure, and a work space with high workability is ensured.

また、上記の第１又は第２の態様に係る締切構造物において、前記水中構造物周囲に、上面の少なくとも一部が水平面となるように形成された台座を備え、前記複数の縦部材は前記水平面の上に配置されている、という構成が本発明の第３の態様として採用されてもよい。
また、本発明は、水中構造物周囲の水中部にドライな作業空間を形成する締切方法であって、前記作業空間に外側から作用する流体力を減勢する築堤を配置した後、前記築堤の内側に間隔をあけて、前記作業空間の少なくとも下面の高さから上に向かい延伸する複数の縦部材を配置し、前記複数の縦部材のうち隣り合う２本の縦部材の間の各々に、内部に水を収容できる中空の函体である止水壁を挿入し、前記複数の縦部材により前記複数の止水壁を起立した状態で支持させ、前記止水壁の各々に水を注入し、前記作業空間内の水を排出する締切方法を第４の態様として提案する。 Further, in the deadline structure according to the first or second aspect, the underwater structure includes a pedestal formed so that at least a part of an upper surface thereof is a horizontal plane around the underwater structure, and the plurality of vertical members are The configuration of being arranged on a horizontal plane may be adopted as the third aspect of the present invention.
Further, the present invention is a deadline method for forming a dry work space in an underwater portion around an underwater structure, and after the embankment for reducing fluid force acting from the outside is disposed in the work space, A plurality of vertical members extending upward from the height of at least the lower surface of the work space with an interval inside, and arranged between each of the two adjacent vertical members among the plurality of vertical members, A water blocking wall that is a hollow box capable of containing water is inserted therein, and the plurality of water blocking walls are supported in an upright state by the plurality of vertical members, and water is injected into each of the water blocking walls. Then, a deadline method for discharging water in the work space is proposed as a fourth aspect.

上記の第４の態様に係る締切方法によれば、流れのある水中においても、水中構造物周囲の水中部にドライな作業空間を確保することができる。また、止水壁の配置の作業が容易である。 According to the deadline method according to the fourth aspect, a dry working space can be secured in the underwater portion around the underwater structure even in flowing water. Moreover, the work of disposing the water blocking wall is easy.

本発明によれば、流れのある水中において、水中構造物周囲の水中部に所望のドライな作業空間が確保される。 According to the present invention, in a flowing water, a desired dry work space is ensured in an underwater portion around an underwater structure.

一実施形態に係る締切構造物及び消波構造物の平面図。The top view of the deadline structure and wave-breaking structure which concern on one Embodiment. 一実施形態に係る締切構造物の断面図。Sectional drawing of the deadline structure which concerns on one Embodiment. 一実施形態に係る消波構造物の断面図。Sectional drawing of the wave-absorbing structure which concerns on one Embodiment. 一実施形態に係るシール材の配置位置を示した図。The figure which showed the arrangement position of the sealing material which concerns on one Embodiment. 一実施形態に係るシール材の配置位置を示した図。The figure which showed the arrangement position of the sealing material which concerns on one Embodiment. 一実施形態に係るシール材の配置位置を示した図。The figure which showed the arrangement position of the sealing material which concerns on one Embodiment. 一実施形態に係るシール材の配置位置を示した図。The figure which showed the arrangement position of the sealing material which concerns on one Embodiment. 一実施形態に係る締切構造物の構築が開始される前の状態の断面図。Sectional drawing of the state before construction of the deadline structure which concerns on one Embodiment is started. 一実施形態に係る締切構造物の構築途中の状態の断面図。Sectional drawing of the state in the middle of construction of the deadline structure concerning one embodiment. 一実施形態に係る締切構造物の構築途中の状態の断面図。Sectional drawing of the state in the middle of construction of the deadline structure concerning one embodiment. 一実施形態に係る締切構造物の構築が完了した状態の断面図。The sectional view in the state where construction of the deadline structure concerning one embodiment was completed. 一実施形態に係る消波構造物の構築が開始される前の状態の断面図。Sectional drawing of the state before construction of the wave-absorbing structure which concerns on one Embodiment is started. 一実施形態に係る消波構造物の構築途中の状態の断面図。Sectional drawing of the state in the middle of construction of the wave-absorbing structure which concerns on one Embodiment. 一実施形態に係る消波構造物の構築途中の状態の断面図。Sectional drawing of the state in the middle of construction of the wave-absorbing structure which concerns on one Embodiment. 一実施形態に係る消波構造物の構築途中の状態の断面図。Sectional drawing of the state in the middle of construction of the wave-absorbing structure which concerns on one Embodiment. 一実施形態に係る消波構造物の構築途中の状態の断面図。Sectional drawing of the state in the middle of construction of the wave-absorbing structure which concerns on one Embodiment. 一実施形態に係る消波構造物の構築途中の状態の断面図。Sectional drawing of the state in the middle of construction of the wave-absorbing structure which concerns on one Embodiment. 一実施形態に係る消波構造物の構築が完了した状態の断面図。A sectional view in the state where construction of a wave-absorbing structure concerning one embodiment was completed.

［実施形態］
以下に本発明の一実施形態に係る締切構造物１及び消波構造物２を説明する。図１は締切構造物１及び消波構造物２の平面図である。図２は図１に示すＡ−Ａ線における締切構造物１の断面図（以下、Ａ−Ａ断面図という）である。図３は図１に示すＢ−Ｂ線における消波構造物２の断面図（以下、Ｂ−Ｂ断面図という）である。ただし、図２において、締切構造物１の後方に位置する消波構造物２の図示は省略されている。また、図３において、消波構造物２の後方に位置する締切構造物１の図示は省略されている。 [Embodiment]
The deadline structure 1 and the wave-dissipating structure 2 according to an embodiment of the present invention will be described below. FIG. 1 is a plan view of the deadline structure 1 and the wave-dissipating structure 2. 2 is a cross-sectional view (hereinafter referred to as an AA cross-sectional view) of the cutoff structure 1 taken along the line AA shown in FIG. 3 is a cross-sectional view (hereinafter referred to as a BB cross-sectional view) of the wave-absorbing structure 2 taken along the line BB shown in FIG. However, in FIG. 2, illustration of the wave-dissipating structure 2 located behind the deadline structure 1 is omitted. In FIG. 3, the illustration of the cutoff structure 1 located behind the wave-dissipating structure 2 is omitted.

以下に、図１〜図３に示される構造物等を説明する。Ｇは地盤であり、Ｗは海水である。本図において海底地盤とは、地盤Ｇのうち上面を海水Ｗに覆われている部分を意味する。図１に示される地盤Ｇは上面を海水Ｗで覆われていない陸部分の地盤である。図１及び図２における左側が陸側、右側が沖側である。 The structure shown in FIGS. 1 to 3 will be described below. G is the ground and W is seawater. In this figure, the seabed ground means a portion of the ground G whose upper surface is covered with seawater W. The ground G shown in FIG. 1 is the ground of the land part whose upper surface is not covered with seawater W. The left side in FIGS. 1 and 2 is the land side, and the right side is the offshore side.

Ｐ₁及びＰ₂は橋脚である。橋脚Ｐ₁及び橋脚Ｐ₂は作業対象の水中構造物の一例であり、橋脚Ｐ₁及び橋脚Ｐ₂に対して、例えば耐震補強等の作業が行われる。Ｆは台座であり、台座Ｆの上に橋脚Ｐ₁及び橋脚Ｐ₂が配置されている。以下、橋脚Ｐ₁及び橋脚Ｐ₂を橋脚Ｐと総称する。 P ₁ and P ₂ are piers. The pier P ₁ and the pier P ₂ are examples of the underwater structure to be worked, and work such as seismic reinforcement is performed on the pier P ₁ and the pier P ₂ . F is a pedestal, and the pier P ₁ and the pier P ₂ are arranged on the pedestal F. Hereinafter, the pier P ₁ and the pier P ₂ are collectively referred to as the pier P.

締切構造物１は、橋脚Ｐ周囲の水中部に所望のドライな作業空間Ｓを形成する構造物である。締切構造物１は、作業空間Ｓに外側から作用する流体力を減勢する築堤１１と、築堤１１の内側に間隔をあけて配置される複数のフレーム１２と、複数のフレーム１２のうち隣り合う２つのフレーム１２の間に各々挿入される複数の止水壁１３と、止水壁１３と台座Ｆの間及び止水壁１３と縦部材１２１の間に配置されるシール材１４を備える。 The deadline structure 1 is a structure that forms a desired dry work space S in the underwater portion around the pier P. The deadline structure 1 is adjacent to the embankment 11 that reduces the fluid force that acts on the work space S from the outside, the plurality of frames 12 that are spaced apart from the inside of the embankment 11, and the plurality of frames 12. A plurality of water blocking walls 13 each inserted between the two frames 12, and a seal member 14 disposed between the water blocking wall 13 and the base F and between the water blocking wall 13 and the vertical member 121 are provided.

築堤１１は、図２に示すように、海底地盤の上に配置された基礎マウンド１１１と、基礎マウンド１１１の２つの法面のうち作業空間Ｓからみて外側の法面を覆うように配置される複数の築堤マット１１２と、基礎マウンド１１１の平坦な上面を覆う粒度調整砕石１１３を有する。 As shown in FIG. 2, the embankment 11 is disposed so as to cover the outer slope as viewed from the work space S out of the two slopes of the foundation mound 111 and the foundation mound 111 arranged on the seabed ground. A plurality of embankment mats 112 and a particle size-adjusted crushed stone 113 covering the flat upper surface of the foundation mound 111 are provided.

基礎マウンド１１１は、Ａ−Ａ断面図において概ね等脚台形となるように海底地盤上に石材を積み上げて築造された構造物であり、築堤１１による流体力の減勢機能の主要部分を担う。築堤マット１１２は、樹脂製、金属製等の籠に多数の石材を収容したもので、基礎マウンド１１１の外側の法面の波浪による破損のリスクを低減する。粒度調整砕石１１３は、基礎マウンド１１１を構成する石材より粒径の小さい石材であり、基礎マウンド１１１の平坦な上面を覆うことにより、その上を重機等が通行可能とする。 The foundation mound 111 is a structure that is built by stacking stones on the seabed so as to have a substantially isosceles trapezoidal shape in the AA cross-sectional view, and plays a major part in the fluid force depressing function of the embankment 11. The embankment mat 112 accommodates a large number of stones in a cage made of resin, metal, etc., and reduces the risk of breakage due to waves on the slope outside the foundation mound 111. The particle size-adjusted crushed stone 113 is a stone material having a particle size smaller than that of the stone material constituting the foundation mound 111, and covers the flat upper surface of the foundation mound 111, thereby allowing heavy machinery or the like to pass therethrough.

フレーム１２は、台座Ｆの上に配置され、止水壁１３を台座Ｆ上で支持する役割を果たす。図１に示す例では、フレーム１２は平面図において概ね矩形の作業空間Ｓの陸側の端辺と、当該陸側の端辺に隣接する２つの端辺に概ね等間隔で配置されている。 The frame 12 is disposed on the base F and plays a role of supporting the water blocking wall 13 on the base F. In the example shown in FIG. 1, the frames 12 are arranged at substantially equal intervals on the land side edge of the substantially rectangular work space S in the plan view and on the two side edges adjacent to the land side edge.

フレーム１２の各々は、作業空間Ｓの少なくとも下面の高さから上に向かい延伸する縦部材１２１と、縦部材１２１の下端部から作業空間Ｓの内側に向かい延伸する横部材１２２と、縦部材１２１と横部材１２２に架け渡すように斜めに配置される斜部材１２３とが一体化された部材である。縦部材１２１、横部材１２２及び斜部材１２３の材料はＨ鋼であり、互いに溶接等により連結されている。また、横部材１２２はアンカーボルト等により台座Ｆに固定されている。 Each of the frames 12 includes a vertical member 121 extending upward from at least the height of the lower surface of the work space S, a horizontal member 122 extending from the lower end of the vertical member 121 toward the inside of the work space S, and a vertical member 121. And a slant member 123 that is disposed obliquely so as to span the cross member 122. The material of the vertical member 121, the horizontal member 122, and the diagonal member 123 is H steel, and is connected to each other by welding or the like. Further, the lateral member 122 is fixed to the base F with anchor bolts or the like.

図１に示されるように、縦部材１２１は、Ｈ形状の開口部分が隣接する他の縦部材１２１のＨ形状の開口部分と互いに対向する方向となるように、横部材１２２に対し連結されている。縦部材１２１は、隣接する他の縦部材１２１との間に挿入される止水壁１３をその凹部に受容し、止水壁１３を台座Ｆ上に起立した状態で支持する。 As shown in FIG. 1, the vertical member 121 is connected to the horizontal member 122 so that the H-shaped opening portion faces the H-shaped opening portion of another adjacent vertical member 121. Yes. The vertical member 121 receives the water blocking wall 13 inserted between the adjacent vertical members 121 in the recess, and supports the water blocking wall 13 in a standing state on the base F.

横部材１２２と斜部材１２３は、縦部材１２１を台座Ｆ上に起立した状態で支持する役割を果たす。作業空間Ｓをドライにした状態において、フレーム１２及び止水壁１３には作業空間Ｓの外側から内側へ向かい海水Ｗの水圧力が加わるが、横部材１２２と斜部材１２３があるため、フレーム１２及び止水壁１３は海水Ｗの水圧力に抗することができる。すなわち、フレーム１２及び止水壁１３は橋脚Ｐからの反力を受けることなく自立するため、例えば橋脚Ｐとフレーム１２の間に切梁を配置する必要はない。 The horizontal member 122 and the oblique member 123 serve to support the vertical member 121 in a state where the vertical member 121 stands on the base F. In a state where the work space S is dry, the water pressure of the seawater W is applied to the frame 12 and the water blocking wall 13 from the outside to the inside of the work space S. However, since there are the lateral member 122 and the oblique member 123, the frame 12 And the water stop wall 13 can resist the water pressure of the seawater W. That is, since the frame 12 and the water blocking wall 13 are self-supporting without receiving a reaction force from the pier P, for example, it is not necessary to arrange a cut beam between the pier P and the frame 12.

止水壁１３の各々は、内部に水を収容できる中空の函体である。止水壁１３は、隣り合う２本の縦部材１２１の間に挿入され、作業空間Ｓがドライにされた状態において、作業空間Ｓに対する海水Ｗの浸入を遮断する役割を果たす。 Each of the water blocking walls 13 is a hollow box that can accommodate water therein. The water blocking wall 13 is inserted between the two adjacent vertical members 121 and plays a role of blocking the intrusion of the seawater W into the work space S in a state where the work space S is dried.

なお、図１に示されるように、止水壁１３のうち作業空間Ｓの陸側の隅角部に配置される止水壁１３は、平面図において概ねＬ字形状を示す。その他の止水壁１３は、平面図において概ね直線形状（細長い矩形）を示す。ただし、止水壁１３の形状は作業空間Ｓの形状に応じて適宜変更されてよい。 In addition, as FIG. 1 shows, the water blocking wall 13 arrange | positioned in the corner part by the side of the work space S among the water blocking walls 13 shows a substantially L shape in a top view. The other water blocking wall 13 has a generally straight shape (elongated rectangle) in the plan view. However, the shape of the water blocking wall 13 may be appropriately changed according to the shape of the work space S.

シール材１４は、止水壁１３と台座Ｆの隙間、及び、止水壁１３とフレーム１２の隙間を水密に塞ぐことにより、ドライにされた作業空間Ｓに対し海水Ｗが漏れ入ることを防止する。シール材１４の材料としては、例えば弾性のあるスポンジゴム等が用いられる。 The sealing material 14 prevents the seawater W from leaking into the dried work space S by watertightly closing the gap between the water blocking wall 13 and the base F and the gap between the water blocking wall 13 and the frame 12. To do. As the material of the sealing material 14, for example, elastic sponge rubber or the like is used.

図４及び図５は、シール材１４が配置される位置を示した図である。シール材１４は、台座Ｆの上面のうち、止水壁１３の底面が接する部分に配置されるシール材１４１と、縦部材１２１の表面のうち、止水壁１３の作業空間Ｓ側の面が接する部分に配置されるシール材１４２を含む。 4 and 5 are views showing positions where the sealing material 14 is arranged. The seal material 14 includes a seal material 141 disposed on a portion of the upper surface of the base F that contacts the bottom surface of the water blocking wall 13, and a surface of the vertical member 121 on the work space S side of the surface of the vertical wall 121. It includes a sealing material 142 disposed on the contacting portion.

隣り合う２本の縦部材１２１の間に、内部に水の注入されていない止水壁１３が挿入された後、止水壁１３の内部に水（例えば、止水壁１３の周りの海水Ｗ）が注入されると、内部に水を収容した状態の止水壁１３の底面は、止水壁１３の自重によりシール材１４１に対し下方に強く押しつけられる。その際、シール材１４１は変形し、台座Ｆと止水壁１３の隙間を塞ぐ。 After the water blocking wall 13 into which water is not injected is inserted between two adjacent vertical members 121, water (for example, seawater W around the water blocking wall 13 is inserted into the water blocking wall 13. ) Is injected, the bottom surface of the water blocking wall 13 in a state where water is contained therein is strongly pressed downward against the sealing material 141 by the dead weight of the water blocking wall 13. At that time, the sealing material 141 is deformed and closes the gap between the base F and the water blocking wall 13.

その後、作業空間Ｓ内の海水Ｗが排水されると、止水壁１３に対し作業空間Ｓの外側から内側に向かう方向に、海水Ｗの水圧力が加わる。この力を受けて、止水壁１３が縦部材１２１に対し水平方向に強く押しつけられる。その際、シール材１４２は変形し、縦部材１２１と止水壁１３の隙間を塞ぐ。 Thereafter, when the seawater W in the work space S is drained, the water pressure of the seawater W is applied to the water blocking wall 13 in the direction from the outside to the inside of the work space S. In response to this force, the water blocking wall 13 is strongly pressed against the vertical member 121 in the horizontal direction. At that time, the sealing material 142 is deformed and closes the gap between the vertical member 121 and the water blocking wall 13.

続いて、図１及び図３を参照しつつ、消波構造物２の構成を説明する。消波構造物２は、沿岸部の海底地盤の上方に配置されるフレーム２１と、フレーム２１を安定させ、かつ消波機能を有する築堤２２と、フレーム２１の陸側に隣接して配置される複数の縦方向支持部材２３と、縦方向支持部材２３とフレーム２１とを連結する連結部材２４と、隣り合う２本の縦方向支持部材２３の間の各々に挿入される止水壁２５と、止水壁２５と台座Ｆの間及び止水壁２５と縦方向支持部材２３の間に配置されるシール材２６を備える。 Then, the structure of the wave-absorbing structure 2 is demonstrated, referring FIG.1 and FIG.3. The wave-dissipating structure 2 is disposed adjacent to the frame 21 disposed above the seabed in the coastal area, the embankment 22 that stabilizes the frame 21 and has a wave-dissipating function, and the land side of the frame 21. A plurality of vertical support members 23, a connecting member 24 that connects the vertical support members 23 and the frame 21, a water blocking wall 25 that is inserted between each of the two adjacent vertical support members 23, The sealing material 26 arrange | positioned between the water blocking wall 25 and the vertical direction supporting member 23 between the water blocking wall 25 and the base F is provided.

フレーム２１は、陸側から沖側に向かい延伸する複数の横部材２１１と、各々がいずれかの横部材２１１の陸側の端部から上に向かい延伸する複数の縦部材２１２と、互いに連結される横部材２１１と縦部材２１２に架け渡すように斜めに配置される斜部材２１３と、縦部材２１２に取り付けられる壁状部材２１４と、隣り合う２本の横部材２１１に架け渡すように配置される複数の横方向補強部材２１５とが一体化された部材である。 The frame 21 is connected to a plurality of horizontal members 211 extending from the land side to the offshore side, and a plurality of vertical members 212 each extending upward from the land-side end of any of the horizontal members 211. The horizontal member 211 and the vertical member 212 are arranged obliquely so as to be bridged between the horizontal member 211 and the vertical member 212, the wall member 214 attached to the vertical member 212, and the two horizontal members 211 adjacent to each other. And a plurality of lateral reinforcing members 215 integrated with each other.

横部材２１１の底面はフレーム２１及びその上の基礎マウンド２２１の重力を受けて築堤２２を構成する石材に接する。従って、横部材２１１の底面と築堤２２の石材との摩擦力が大きい程、フレーム２１が築堤２２に埋設された状態で安定するため望ましい。従って、石材との摩擦力を増すために、横部材２１１の底面がコンクリート等で被覆されていてもよい。 The bottom surface of the horizontal member 211 is in contact with the stone material constituting the embankment 22 by receiving the gravity of the frame 21 and the foundation mound 221 on the frame 21. Therefore, the larger the frictional force between the bottom surface of the transverse member 211 and the stone material of the embankment 22, the more stable the frame 21 is embedded in the embankment 22. Therefore, in order to increase the frictional force with the stone, the bottom surface of the transverse member 211 may be covered with concrete or the like.

なお、図１の例では、消波構造物２が備えるフレーム２１の数は４つであるが、この数は作業空間Ｓの沖側の辺の長さに応じて適宜変更される。また、図１の例では、１つのフレーム２１が備える横部材２１１、縦部材２１２及び斜部材２１３は各３本であるが、この数も適宜変更されてよい。 In the example of FIG. 1, the number of frames 21 included in the wave-dissipating structure 2 is four, but this number is appropriately changed according to the length of the offshore side of the work space S. In the example of FIG. 1, the number of the horizontal members 211, the vertical members 212, and the diagonal members 213 included in one frame 21 is three, but this number may be changed as appropriate.

横部材２１１、縦部材２１２及び斜部材２１３の材料はＨ鋼であり、横方向補強部材２１５の材料は溝形鋼であり、これらは互いに溶接等により連結されている。壁状部材２１４の材料は鋼板又は木製等の板状部材である。本実施形態において、壁状部材２１４は、隣り合う２本の縦部材２１２の間に挿入された状態で、それらの縦部材２１２に取り付けられる。従って、図１の例では、１つのフレーム２１は２枚の壁状部材２１４を有する。 The material of the horizontal member 211, the vertical member 212 and the diagonal member 213 is H steel, and the material of the horizontal reinforcing member 215 is channel steel, which are connected to each other by welding or the like. The material of the wall member 214 is a plate member such as a steel plate or wood. In the present embodiment, the wall-like member 214 is attached to the vertical members 212 in a state of being inserted between two adjacent vertical members 212. Therefore, in the example of FIG. 1, one frame 21 has two wall members 214.

壁状部材２１４が縦部材２１２に取り付けられる、とは、壁状部材２１４が沖側から陸側に向かう方向に移動しないように縦部材２１２によって支持されることを意味し、壁状部材２１４が縦部材２１２に固定連結されている必要はない。従って、本実施形態では、上述したように、隣り合う２本の縦部材２１２の間に壁状部材２１４が挿入される構成が採用されている。ただし、壁状部材２１４が２本の縦部材２１２の間に挿入される代わりに、壁状部材２１４が、例えば縦部材２１２の作業空間Ｓ側の面上に、溶接等により取り付けられてもよい。 The wall-like member 214 is attached to the vertical member 212 means that the wall-like member 214 is supported by the vertical member 212 so as not to move in the direction from the offshore side toward the land side. It is not necessary to be fixedly connected to the vertical member 212. Therefore, in this embodiment, as described above, a configuration in which the wall-like member 214 is inserted between two adjacent vertical members 212 is employed. However, instead of the wall-shaped member 214 being inserted between the two vertical members 212, the wall-shaped member 214 may be attached to the surface of the vertical member 212 on the working space S side by welding or the like, for example. .

築堤２２は、海底地盤の上に配置された基礎マウンド２２１と、基礎マウンド２２１の平坦な上面を覆うように配置される複数の築堤マット２２２と、築堤マット２２２の上面を覆う粒度調整砕石２２３と、基礎マウンド２２１の沖側の法面を覆うように配置される複数の消波ブロック２２４を有する。 The embankment 22 includes a foundation mound 221 disposed on the submarine ground, a plurality of embankment mats 222 disposed so as to cover the flat upper surface of the foundation mound 221, and a particle size-adjusted crushed stone 223 that covers the upper surface of the embankment mat 222 And a plurality of wave-dissipating blocks 224 arranged to cover the slope on the offshore side of the foundation mound 221.

フレーム２１の少なくとも横部材２１１は、基礎マウンド２２１に埋設されている。すなわち、築堤２２は、海底面から横部材２１１の上面以上までの高さ範囲に配置されている。 At least the lateral member 211 of the frame 21 is embedded in the foundation mound 221. That is, the embankment 22 is arranged in a height range from the sea bottom to the upper surface of the transverse member 211.

基礎マウンド２２１は、Ｂ−Ｂ断面図における陸側の底角が概ね９０度、沖側の底角が鋭角の台形となるように海底地盤上に石材を積み上げて築造された構造物であり、築堤２２による消波機能の主要部分を担う。基礎マウンド２２１の陸側の側面は、下方部分が台座Ｆの沖側の側面によって支持され、また、上方部分がフレーム２１の壁状部材２１４によって支持されて、概ね鉛直に切り立っている。 The foundation mound 221 is a structure built by stacking stones on the seabed ground so that the land-side base angle in the BB cross-sectional view is approximately 90 degrees and the base angle on the offshore side is an acute angle. It plays the main part of the wave extinguishing function by the embankment 22. The land-side side surface of the foundation mound 221 has a lower part supported by the off-shore side surface of the base F, and an upper part supported by the wall-like member 214 of the frame 21 so as to stand substantially vertically.

築堤マット２２２は、樹脂製、金属製等の籠に多数の石材を収容したもので、基礎マウンド２２１の上面の波浪による破損のリスクを低減する。粒度調整砕石２２３は、築堤マット２２２の籠に収容される石材より粒径の小さい石材であり、基礎マウンド２２１の上に平坦に配置されている築堤マット２２２の上面を覆うことにより、その上を重機等が通行可能とする。消波ブロック２２４は、築堤２２の消波機能を増強するとともに、基礎マウンド２２１の沖側の法面の波浪による破損のリスクを低減する。 The embankment mat 222 contains a large number of stones in a cage made of resin, metal, etc., and reduces the risk of damage due to waves on the upper surface of the foundation mound 221. The particle size-adjusted crushed stone 223 is a stone material having a particle diameter smaller than that of the stone material accommodated in the ridge of the embankment mat 222, and covers the upper surface of the embankment mat 222 disposed flat on the foundation mound 221 so as to cover it. Allows heavy machinery to pass. The wave-dissipating block 224 enhances the wave-dissipating function of the embankment 22 and reduces the risk of breakage due to waves on the slope off the foundation mound 221.

縦方向支持部材２３は、台座Ｆの上に配置され、止水壁２５を台座Ｆ上で支持する役割を果たす。図１に示す例では、縦方向支持部材２３は平面図において概ね矩形の作業空間Ｓの沖側の端辺に概ね等間隔で配置されている。 The vertical support member 23 is disposed on the base F and plays a role of supporting the water blocking wall 25 on the base F. In the example shown in FIG. 1, the longitudinal support members 23 are arranged at substantially equal intervals on the offshore side edge of the substantially rectangular work space S in the plan view.

縦方向支持部材２３の材料はＨ鋼であり、台座Ｆ上に起立した状態で連結部材２４によりいずれかのフレーム２１の縦部材２１２に連結されている。図１に示されるように、縦方向支持部材２３は、Ｈ形状の開口部分が隣接する他の縦方向支持部材２３のＨ形状の開口部分と互いに対向する方向となるように配置されている。縦方向支持部材２３は、隣接する他の縦方向支持部材２３との間に挿入される止水壁２５をその凹部に受容し、止水壁２５を台座Ｆ上に起立した状態で支持する。 The material of the vertical support member 23 is H steel, and is connected to the vertical member 212 of any one of the frames 21 by the connection member 24 while standing on the base F. As shown in FIG. 1, the vertical support members 23 are arranged so that the H-shaped opening portions are opposed to the H-shaped opening portions of other adjacent vertical support members 23. The vertical support member 23 receives the water blocking wall 25 inserted between the adjacent vertical support members 23 in the recess, and supports the water blocking wall 25 in a standing state on the base F.

連結部材２４は縦方向支持部材２３とフレーム２１を連結する。図３の例では、連結部材２４の各々は２本の横方向連結部材２４１と３つのチェーンブロック２４２を有しているが、これらの数は適宜変更されてよい。 The connecting member 24 connects the vertical support member 23 and the frame 21. In the example of FIG. 3, each of the connecting members 24 includes two lateral connecting members 241 and three chain blocks 242, but these numbers may be changed as appropriate.

横方向連結部材２４１は長さ調整が可能であり、縦方向支持部材２３の沖側の側面と、その側面に対向する位置にあるフレーム２１の縦部材２１２の陸側の側面の間に配置され、フレーム２１に対する縦方向支持部材２３の位置決めを行う役割を果たす。 The lateral connection member 241 can be adjusted in length, and is disposed between the offshore side surface of the vertical support member 23 and the land side surface of the vertical member 212 of the frame 21 at a position facing the side surface. The vertical support member 23 is positioned relative to the frame 21.

チェーンブロック２４２は横方向連結部材２４１が間に配置された状態の縦部材２１２と縦方向支持部材２３に架け渡されたチェーンを締め上げ、縦方向支持部材２３をフレーム２１に対し固定する役割を果たす。 The chain block 242 serves to fix the longitudinal support member 23 to the frame 21 by tightening the chain spanned between the longitudinal member 212 and the longitudinal support member 23 with the lateral connection member 241 disposed therebetween. Fulfill.

上記のように、縦方向支持部材２３は連結部材２４によりフレーム２１に連結された状態で台座Ｆ上に起立した状態で支持される。作業空間Ｓをドライにした状態において、縦方向支持部材２３及び止水壁２５には作業空間Ｓの外側から内側へ向かい海水Ｗの水圧力が加わるが、縦方向支持部材２３がフレーム２１に連結されているため、縦方向支持部材２３及び止水壁２５は海水Ｗの水圧力に抗することができる。従って、例えば海水Ｗの水圧力に抗するために橋脚Ｐと縦方向支持部材２３の間に切梁を配置する必要はない。 As described above, the vertical support member 23 is supported in a state where the vertical support member 23 stands on the base F while being connected to the frame 21 by the connecting member 24. In the state where the work space S is dry, water pressure of seawater W is applied to the vertical support member 23 and the water blocking wall 25 from the outside to the inside of the work space S, but the vertical support member 23 is connected to the frame 21. Therefore, the vertical support member 23 and the water blocking wall 25 can withstand the water pressure of the seawater W. Therefore, for example, in order to resist the water pressure of the seawater W, it is not necessary to arrange a beam between the bridge pier P and the longitudinal support member 23.

止水壁２５の各々は、内部に水を収容できる中空の函体である。止水壁２５は、隣り合う２本の縦方向支持部材２３の間に挿入され、作業空間Ｓがドライにされた状態において、作業空間Ｓに対する海水Ｗの浸入を遮断する役割を果たす。なお、図１に示されるように、止水壁２５は平面図において概ね直線形状（細長い矩形）を示す。ただし、止水壁２５の形状は作業空間Ｓの形状に応じて適宜変更されてよい。 Each of the water blocking walls 25 is a hollow box that can accommodate water therein. The water blocking wall 25 is inserted between the two adjacent longitudinal support members 23 and plays a role of blocking the intrusion of the seawater W into the work space S in a state where the work space S is dried. In addition, as FIG. 1 shows, the water stop wall 25 shows a substantially linear shape (elongated rectangle) in a top view. However, the shape of the water blocking wall 25 may be appropriately changed according to the shape of the work space S.

シール材２６は、止水壁２５と台座Ｆの隙間、及び、止水壁２５と縦方向支持部材２３の隙間を水密に塞ぐことにより、ドライにされた作業空間Ｓに対し海水Ｗが漏れ入ることを防止する。シール材２６の材料としては、例えば弾性のあるスポンジゴム等が用いられる。 The sealing material 26 seals the gap between the water blocking wall 25 and the pedestal F and the gap between the water blocking wall 25 and the longitudinal support member 23 in a watertight manner, so that the seawater W leaks into the dry work space S. To prevent that. As a material of the sealing material 26, for example, elastic sponge rubber or the like is used.

図６及び図７は、シール材２６が配置される位置を示した図である。シール材２６は、台座Ｆの上面のうち、止水壁２５の底面が接する部分に配置されるシール材２６１と、縦方向支持部材２３の表面のうち、止水壁２５の作業空間Ｓ側の面が接する部分に配置されるシール材２６２を含む。 6 and 7 are views showing positions where the sealing material 26 is arranged. The sealing material 26 includes a sealing material 261 disposed on a portion of the upper surface of the pedestal F that is in contact with the bottom surface of the water blocking wall 25 and a surface of the vertical support member 23 on the work space S side of the water blocking wall 25. It includes a sealing material 262 disposed at a portion where the surface contacts.

隣り合う２本の縦方向支持部材２３の間に、内部に水の注入されていない止水壁２５が挿入された後、止水壁２５の内部に水（例えば、止水壁２５の周りの海水Ｗ）が注入されると、内部に水を収容した状態の止水壁２５の底面は、止水壁２５の自重によりシール材２６１に対し下方に強く押しつけられる。その際、シール材２６１は変形し、台座Ｆと止水壁２５の隙間を塞ぐ。 After a water blocking wall 25 into which water is not injected is inserted between two adjacent vertical support members 23, water (for example, around the water blocking wall 25 around the water blocking wall 25). When the seawater W) is injected, the bottom surface of the water blocking wall 25 in a state where water is accommodated therein is strongly pressed downward against the sealing material 261 by the weight of the water blocking wall 25. At that time, the sealing material 261 is deformed and closes the gap between the base F and the water blocking wall 25.

その後、作業空間Ｓ内の海水Ｗが排水されると、止水壁２５に対し作業空間Ｓの外側から内側に向かう方向に、海水Ｗの水圧力が加わる。この水圧力を受けて、止水壁２５が縦方向支持部材２３に対し水平方向に強く押しつけられる。その際、シール材２６２は変形し、縦方向支持部材２３と止水壁２５の隙間を塞ぐ。 Thereafter, when the seawater W in the work space S is drained, the water pressure of the seawater W is applied to the water blocking wall 25 in the direction from the outside to the inside of the work space S. In response to this water pressure, the water blocking wall 25 is strongly pressed against the vertical support member 23 in the horizontal direction. At that time, the sealing material 262 is deformed and closes the gap between the vertical support member 23 and the water blocking wall 25.

図１に示されるように、締切構造物１が備える止水壁１３は作業空間Ｓの陸側の側面と当該側面に隣接する２つの側面を囲むように配置される。また、消波構造物２が備える止水壁２５は作業空間Ｓの沖側の側面を囲むように配置される。これらの止水壁に加え、締切構造物１の最も沖側に配置される縦部材１２１と、それらの縦部材１２１に隣り合う消波構造物２の縦方向支持部材２３との間には、止水壁３１が挿入される。また、止水壁３１と台座Ｆの間及び止水壁３１と縦部材１２１又は縦方向支持部材２３の間には、シール材３２が配置される。 As shown in FIG. 1, the water blocking wall 13 provided in the cutoff structure 1 is disposed so as to surround a land side surface of the work space S and two side surfaces adjacent to the side surface. Further, the water blocking wall 25 provided in the wave-dissipating structure 2 is disposed so as to surround the side surface on the offshore side of the work space S. In addition to these water blocking walls, between the vertical member 121 arranged on the most offshore side of the cutoff structure 1 and the vertical support member 23 of the wave-dissipating structure 2 adjacent to the vertical member 121, The water blocking wall 31 is inserted. Further, the sealing material 32 is disposed between the water blocking wall 31 and the base F and between the water blocking wall 31 and the vertical member 121 or the vertical support member 23.

なお、止水壁３１は平面図において概ねＬ字形状を示す。ただし、止水壁３１の形状は作業空間Ｓの形状に応じて適宜変更されてよい。 The water blocking wall 31 is generally L-shaped in a plan view. However, the shape of the water blocking wall 31 may be appropriately changed according to the shape of the work space S.

止水壁３１は、止水壁１３及び止水壁２５と同様に、内部に水を収容できる中空の函体である。シール材３２は、シール材１４及びシール材２６と同様に、スポンジゴム等の弾性体であり、止水壁３１と台座Ｆの隙間及び止水壁３１と縦部材１２１又は縦方向支持部材２３の隙間を塞ぐ。作業空間Ｓは、止水壁１３、止水壁２５及び止水壁３１によってその全周を囲まれ、外側からの海水Ｗの浸入を受けることなくドライな状態が保たれる。 The water blocking wall 31 is a hollow box that can accommodate water in the same manner as the water blocking wall 13 and the water blocking wall 25. Similar to the sealing material 14 and the sealing material 26, the sealing material 32 is an elastic body such as sponge rubber, and the clearance between the water blocking wall 31 and the base F and the water blocking wall 31 and the vertical member 121 or the vertical support member 23. Close the gap. The work space S is surrounded by the water blocking wall 13, the water blocking wall 25, and the water blocking wall 31, so that the work space S is kept dry without receiving the intrusion of the seawater W from the outside.

以上が、締切構造物１及び消波構造物２の構成の説明である。続いて、上記の構成を備える締切構造物１及び消波構造物２の構築方法を説明する。以下、便宜的に締切構造物１の構築方法を説明した後、消波構造物２の構築方法を説明するが、これらの構造物の構築が同時並行で行われてもよい。 The above is the description of the configuration of the deadline structure 1 and the wave-dissipating structure 2. Then, the construction method of the deadline structure 1 and the wave-dissipating structure 2 provided with said structure is demonstrated. Hereinafter, for convenience, the construction method of the deadline structure 1 will be described, and then the construction method of the wave-dissipating structure 2 will be described. However, the construction of these structures may be performed in parallel.

図８は、締切構造物１の構築が開始される前の状態のＡ−Ａ断面図である。まず、台座Ｆの近傍の海底地盤の上に石材を投下し、均して、基礎マウンド１１１を築造する。続いて、基礎マウンド１１１の外側の法面の上に、当該法面を覆うように築堤マット１１２を並べて配置する。続いて、基礎マウンド１１１の上面の平坦な部分に粒度調整砕石１１３を投下し、均す。なお、築堤マット１１２の配置と粒度調整砕石１１３の配置の順序は問わない。これにより、築堤１１の配置が完了する。図９は、築堤１１の配置が完了した状態のＡ−Ａ断面図である。 FIG. 8 is a cross-sectional view taken along the line AA in a state before the construction of the deadline structure 1 is started. First, a stone material is dropped on the seabed near the base F, and the foundation mound 111 is constructed. Subsequently, the embankment mat 112 is arranged on the slope outside the foundation mound 111 so as to cover the slope. Subsequently, the particle size-adjusted crushed stone 113 is dropped on the flat portion of the upper surface of the foundation mound 111 and leveled. In addition, the order of arrangement | positioning of the embankment mat 112 and arrangement | positioning of the particle size adjustment crushed stone 113 is not ask | required. Thereby, arrangement | positioning of the embankment 11 is completed. FIG. 9 is a cross-sectional view taken along line AA in a state where the arrangement of the embankment 11 is completed.

続いて、台座Ｆ上にフレーム１２を配置し、アンカーボルト等で固定する。続いて、シール材１４を配置する。図１０は、フレーム１２とシール材１４の配置が完了した状態のＡ−Ａ断面図である。 Subsequently, the frame 12 is arranged on the base F and fixed with anchor bolts or the like. Subsequently, the sealing material 14 is disposed. FIG. 10 is a cross-sectional view taken along line AA in a state where the arrangement of the frame 12 and the sealing material 14 is completed.

続いて、隣り合うフレーム１２の間に、まだ水の注入されていない止水壁１３を挿入する。続いて、止水壁１３に水（例えば、周りの海水Ｗ）を注入する。図１１は、止水壁１３の配置が完了した状態のＡ−Ａ断面図である。これにより、締切構造物１の構築が完了する。 Subsequently, the water blocking wall 13 into which water has not yet been injected is inserted between the adjacent frames 12. Subsequently, water (for example, surrounding seawater W) is injected into the water blocking wall 13. FIG. 11 is a cross-sectional view taken along the line AA in a state where the arrangement of the water blocking wall 13 is completed. Thereby, the construction of the deadline structure 1 is completed.

図１２は、消波構造物２の構築が開始される前の状態のＢ−Ｂ断面図である。まず、台座Ｆに近接する海底地盤の上に、上面の高さが台座Ｆの上面と概ね同じ高さとなるまで石材を投下し、均して、基礎マウンド２２１の下層部分２２１１を築造する。図１３は、基礎マウンド２２１の下層部分２２１１の築造が完了した状態のＢ−Ｂ断面図である。 FIG. 12 is a BB cross-sectional view of a state before the construction of the wave-dissipating structure 2 is started. First, stone material is dropped on the seabed ground close to the pedestal F until the height of the upper surface is substantially the same as the upper surface of the pedestal F, and the lower layer portion 2211 of the foundation mound 221 is constructed. FIG. 13 is a cross-sectional view taken along the line B-B in a state where the lower layer portion 2211 of the foundation mound 221 is completely built.

続いて、下層部分２２１１の上にフレーム２１を配置する。続いて、フレーム２１に連結部材２４の横方向連結部材２４１を取り付ける。なお、横方向連結部材２４１が予め取り付けられた状態のフレーム２１が下層部分２２１１の上に配置されてもよい。図１４は、フレーム２１の配置及び横方向連結部材２４１の取り付けが完了した状態のＢ−Ｂ断面図である。 Subsequently, the frame 21 is disposed on the lower layer portion 2211. Subsequently, the lateral direction connecting member 241 of the connecting member 24 is attached to the frame 21. Note that the frame 21 with the lateral connecting member 241 attached in advance may be disposed on the lower layer portion 2211. FIG. 14 is a cross-sectional view taken along the line BB in a state where the arrangement of the frame 21 and the attachment of the lateral connection member 241 are completed.

続いて、下層部分２２１１の上に配置されたフレーム２１の横部材２１１と、斜部材２１３の少なくとも一部が基礎マウンド２２１内に埋設されるように、下層部分２２１１の上に石材を投下し、均して、基礎マウンド２２１の上層部分２２１２を築造する。これにより、基礎マウンド２２１の築造が完了する。図１５は、基礎マウンド２２１の築造が完了した状態のＢ−Ｂ断面図である。 Subsequently, the stone member is dropped on the lower layer portion 2211 so that the horizontal member 211 of the frame 21 disposed on the lower layer portion 2211 and at least a part of the oblique member 213 are embedded in the foundation mound 221. Equally, the upper layer portion 2212 of the foundation mound 221 is constructed. Thereby, the construction of the foundation mound 221 is completed. FIG. 15 is a cross-sectional view taken along the line B-B in a state where the foundation mound 221 is completely built.

続いて、基礎マウンド２２１の上面の平坦な部分を覆うように築堤マット２２２を並べて配置した後、築堤マット２２２の上に粒度調整砕石２２３を投下し、均す。続いて、基礎マウンド２２１の沖側の法面を覆うように消波ブロック２２４を配置する。これにより、築堤２２の配置が完了する。図１６は、築堤２２の配置が完了した状態のＢ−Ｂ断面図である。 Subsequently, the embankment mat 222 is arranged side by side so as to cover the flat portion of the upper surface of the foundation mound 221, and then the particle size-adjusted crushed stone 223 is dropped on the embankment mat 222 and leveled. Subsequently, the wave-dissipating block 224 is disposed so as to cover the slope on the offshore side of the foundation mound 221. Thereby, arrangement | positioning of the embankment 22 is completed. FIG. 16 is a cross-sectional view taken along the line B-B in a state where the arrangement of the embankment 22 is completed.

続いて、台座Ｆ上に縦方向支持部材２３を配置し、チェーンブロック２４２で縦方向支持部材２３をフレーム２１に対し固定する。続いて、シール材２６を配置する。図１７は、縦方向支持部材２３とシール材２６の配置が完了した状態のＢ−Ｂ断面図である。 Subsequently, the longitudinal support member 23 is disposed on the base F, and the longitudinal support member 23 is fixed to the frame 21 by the chain block 242. Subsequently, the sealing material 26 is disposed. FIG. 17 is a cross-sectional view taken along the line B-B in a state in which the arrangement of the vertical support member 23 and the sealing material 26 is completed.

続いて、隣り合う縦方向支持部材２３の間に、まだ水の注入されていない止水壁２５を挿入する。続いて、止水壁２５に水（例えば、周りの海水Ｗ）を注入する。図１８は、止水壁２５の配置が完了した状態のＢ−Ｂ断面図である。これにより、消波構造物２の構築が完了する。 Subsequently, the water blocking wall 25 into which water has not yet been injected is inserted between the adjacent vertical support members 23. Subsequently, water (for example, surrounding seawater W) is injected into the water blocking wall 25. FIG. 18 is a cross-sectional view taken along the line BB in a state where the arrangement of the water blocking wall 25 is completed. Thereby, construction of the wave-dissipating structure 2 is completed.

続いて、作業空間Ｓの沖側の隅角部の縦部材１２１と縦方向支持部材２３、及びそれらの間の台座Ｆ上にシール材３２を配置する。続いて、作業空間Ｓの沖側の隅角部の縦部材１２１と縦方向支持部材２３の間に止水壁３１を挿入する。続いて、止水壁３１に水（例えば、周りの海水Ｗ）を注入する。これにより、作業空間Ｓの側面の全周が、止水壁１３、止水壁２５及び止水壁３１によって止水された状態で囲まれることになる。 Subsequently, the seal member 32 is disposed on the vertical member 121 and the vertical support member 23 at the corners on the offshore side of the work space S and the pedestal F therebetween. Subsequently, the water blocking wall 31 is inserted between the vertical member 121 and the vertical support member 23 at the corner on the offshore side of the work space S. Subsequently, water (for example, surrounding seawater W) is injected into the water blocking wall 31. As a result, the entire circumference of the side surface of the work space S is surrounded by the water stop wall 13, the water stop wall 25, and the water stop wall 31.

続いて、作業空間Ｓ内の水を排出する。これにより、図２及び図３に示されるように、作業空間Ｓがドライな状態となる。 Subsequently, the water in the work space S is discharged. Thereby, as shown in FIGS. 2 and 3, the work space S is in a dry state.

以上が、締切構造物１及び消波構造物２の構築方法の説明である。締切構造物１及び消波構造物２の撤去方法は、上述した構築方法における順序と概ね逆の作業を行う方法となり、上述した締切構造物１及び消波構造物２の構築方法に照らせば当業者にとって自明であるため、その説明を省略する。 The above is the description of the construction method of the deadline structure 1 and the wave-dissipating structure 2. The removal method of the deadline structure 1 and the wave-dissipating structure 2 is a method of performing a work substantially reverse to the order in the construction method described above. Since it is self-explanatory to the contractor, the description is omitted.

締切構造物１によれば、水流を伴う水中において、ドライな状態の作業空間Ｓが確保される。また、止水壁１３が軽量な中空の函体であるため、その配置の作業が容易である。さらに、フレーム１２は自立するため、橋脚Ｐとフレーム１２の間に切梁を配置する必要がなく、高い作業性の作業空間Ｓが確保される。 According to the deadline structure 1, the work space S in a dry state is secured in the water accompanied by the water flow. Moreover, since the water blocking wall 13 is a lightweight hollow box, the arrangement | positioning operation | work is easy. Furthermore, since the frame 12 is self-supporting, it is not necessary to arrange a beam between the pier P and the frame 12, and a work space S with high workability is secured.

上述の実施形態は本発明に一具体例であって、本発明の技術的思想の範囲内において様々に変形可能である。例えば、締切構造物１は沿岸部、すなわち波浪を伴う海域に配置されるものとしたが、水流を伴う水域であれば、例えば河川等に配置されてもよい。また、上述の実施形態において採用されている部材の数、配置位置、形状、大きさ等は例示であって、適宜変更されてよい。例えば、上述した実施形態において縦部材１２１及び縦方向支持部材２３の材料として採用されているＨ鋼に代えて、２本の溝形鋼を溶接等により接合した材料等の他の材料が採用されてもよい。 The above-described embodiments are specific examples of the present invention, and various modifications can be made within the scope of the technical idea of the present invention. For example, the deadline structure 1 is disposed in a coastal area, that is, in a sea area with waves, but may be disposed in a river or the like as long as it is a water area with a water current. Moreover, the number of members, the arrangement position, the shape, the size, and the like employed in the above-described embodiment are examples, and may be changed as appropriate. For example, in place of the H steel employed as the material of the longitudinal member 121 and the longitudinal support member 23 in the above-described embodiment, other materials such as a material obtained by joining two channel steels by welding or the like are employed. May be.

築堤マット１１２、築堤マット２２２、粒度調整砕石１１３、粒度調整砕石２２３についても本発明の技術的思想の範囲内において様々に変形可能である。例えば流体力の減勢に直接寄与しない築堤マット１１２、築堤マット２２２、粒度調整砕石１１３、粒度調整砕石２２３は、それらの機能を代替する他の材料に置き換えられてもよいし、それらの材料そのものが省略されてもよい。 The embankment mat 112, the embankment mat 222, the particle size adjusted crushed stone 113, and the particle size adjusted crushed stone 223 can be variously modified within the scope of the technical idea of the present invention. For example, the embankment mat 112, the embankment mat 222, the particle size-adjusted crushed stone 113, and the particle-size-adjusted crushed stone 223 that do not directly contribute to the reduction of fluid force may be replaced with other materials that substitute their functions, or the materials themselves. May be omitted.

１…締切構造物、２…消波構造物、１１…築堤、１２…フレーム、１３…止水壁、１４…シール材、２１…フレーム、２２…築堤、２３…縦方向支持部材、２４…連結部材、２５…止水壁、２６…シール材、３１…止水壁、３２…シール材、１１１…基礎マウンド、１１２…築堤マット、１１３…粒度調整砕石、１２１…縦部材、１２２…横部材、１２３…斜部材、２１１…横部材、２１２…縦部材、２１３…斜部材、２１４…壁状部材、２１５…横方向補強部材、２２１…基礎マウンド、２２２…築堤マット、２２３…粒度調整砕石、２２４…消波ブロック、２４１…横方向連結部材、２４２…チェーンブロック DESCRIPTION OF SYMBOLS 1 ... Deadline structure, 2 ... Wave-breaking structure, 11 ... Embankment, 12 ... Frame, 13 ... Water blocking wall, 14 ... Sealing material, 21 ... Frame, 22 ... Embankment, 23 ... Longitudinal support member, 24 ... Connection 25, water blocking wall, 26 ... sealing material, 31 ... water blocking wall, 32 ... sealing material, 111 ... foundation mound, 112 ... embankment mat, 113 ... particle size-adjusted crushed stone, 121 ... vertical member, 122 ... horizontal member, 123 ... Diagonal member, 211 ... Horizontal member, 212 ... Vertical member, 213 ... Diagonal member, 214 ... Wall-like member, 215 ... Lateral reinforcement member, 221 ... Foundation mound, 222 ... Embankment mat, 223 ... Grain size-adjusted crushed stone, 224 ... wave-dissipating block, 241 ... transverse connecting member, 242 ... chain block

Claims

A deadline structure that forms a dry work space in the underwater area around the underwater structure,
Embankment to reduce the fluid force acting on the working space from the outside;
A plurality of vertical members arranged at intervals inside the embankment and extending upward from the height of at least the lower surface of the work space;
A plurality of water blocking walls that are each inserted between two adjacent ones of the plurality of vertical members and are hollow boxes capable of containing water therein , and
The plurality of vertical members are cutoff structures that support the plurality of water blocking walls in an upright state .

A transverse member and an oblique member constituting a frame integrated with the longitudinal member;
The deadline structure according to claim 1, wherein the frame and the water blocking wall stand independently without receiving a reaction force from the underwater structure in a state where the work space is dry.

Around the underwater structure, provided with a pedestal formed so that at least a part of the upper surface becomes a horizontal plane,
The plurality of vertical members are disposed on the horizontal plane.
The deadline structure according to claim 1 or 2.

A deadline method for forming a dry work space in the underwater area around an underwater structure,
After arranging the embankment to reduce the fluid force acting from the outside in the work space,
A plurality of vertical members extending upward from the height of at least the lower surface of the work space, with an interval inside the embankment,
A water blocking wall, which is a hollow box capable of containing water inside, is inserted between two adjacent vertical members among the plurality of vertical members, and the plurality of water blocking members are inserted by the plurality of vertical members. Support the wall upright,
Water is poured into each of the water blocking walls,
A deadline method for discharging water in the work space.