JP6258022B2

JP6258022B2 - Temporary deadline structure

Info

Publication number: JP6258022B2
Application number: JP2013249006A
Authority: JP
Inventors: 井上　哲夫; 哲夫井上; 水野　正彦; 正彦水野; 昌弘増田; 満支倉; 良介朝倉
Original assignee: Kajima Corp
Current assignee: Kajima Corp
Priority date: 2013-12-02
Filing date: 2013-12-02
Publication date: 2018-01-10
Anticipated expiration: 2033-12-02
Also published as: JP2015105547A

Description

本発明は、水中に設けられた既設の水中構造物に対して工事を実施するための作業空間を形成する仮締切構造体に関する。 The present invention relates to a temporary closing structure that forms a work space for performing construction on an existing underwater structure provided in water.

このような分野の技術として特許文献１がある。特許文献１には、水中に構築された橋脚の周囲に作業空間を確保するための仮締切り構造物が記載されている。この仮締切り構造物は、橋脚を取り囲むように構築される筒状仮設体を備え、筒状仮設体の下端部は橋脚のフーチングに固定されている。 There exists patent document 1 as a technique of such a field | area. Patent Document 1 describes a temporary closing structure for securing a work space around a pier constructed in water. The temporary closing structure includes a cylindrical temporary body constructed so as to surround the pier, and the lower end portion of the cylindrical temporary body is fixed to the footing of the pier.

特開平９−２２１７６０号公報JP-A-9-221760

しかし、特許文献１に記載された仮締切り構造物では、橋脚等の水中構造物の全周を取り囲むように仮締切り構造体をなす筒状仮設体を構築する。この仮締切り構造物によれば、工事の対象となる領域が水中構造物の一部分であったとしても、水中構造物の全周を取り囲むように筒状仮設体を設置する。従って、水中構造物が大型化すると仮締切り構造物も大型化して仮締切り構造物の施工が複雑化及び長期化するため、作業空間の形成における施工効率の向上を図り難かった。 However, in the temporary closing structure described in Patent Document 1, a cylindrical temporary structure that forms the temporary closing structure is constructed so as to surround the entire circumference of the underwater structure such as a bridge pier. According to this temporary closing structure, the cylindrical temporary structure is installed so as to surround the entire circumference of the underwater structure even if the region to be constructed is a part of the underwater structure. Accordingly, when the underwater structure is enlarged, the temporary closing structure is also enlarged, and the construction of the temporary closing structure is complicated and prolonged. Therefore, it is difficult to improve the construction efficiency in forming the work space.

そこで、本発明は、水中構造物の工事に要する作業空間を形成するときの施工効率を向上させることが可能な仮締切構造体を提供することを目的とする。 Accordingly, an object of the present invention is to provide a temporary closing structure capable of improving the construction efficiency when forming a work space required for the construction of the underwater structure.

本発明は、水中に設けられた水中構造物の周辺に作業空間を形成する仮締切構造体において、水中構造物に取り付けるための第１及び第２の取付端部を有し、水中構造物の一部を覆うように円弧状に延びて作業空間を形成する隔壁部と、第１の取付端部と水中構造物との間、及び第２の取付端部と水中構造物との間の少なくとも一方に配置され、隔壁部を水中構造物に連結すると共に、隔壁部と水中構造物との間を止水する連結止水部と、を備え、連結止水部は、水中構造物に固定される受け部と、隔壁部に固定され、受け部に対して押し付けられる押圧部と、を有していることを特徴とする仮締切構造体。 The present invention relates to a temporary closing structure that forms a work space around an underwater structure provided in water, and has first and second attachment end portions for attachment to the underwater structure. At least between the partition wall portion extending in an arc shape so as to cover a part and forming a work space, between the first attachment end portion and the underwater structure, and between the second attachment end portion and the underwater structure. Disposed on one side, and connected to the underwater structure, and connected to a water stop between the partition and the underwater structure, and the connected water stop is fixed to the underwater structure. And a pressing portion that is fixed to the partition wall and pressed against the receiving portion.

この仮締切構造体では、隔壁部が、連結止水部によって水中構造物に連結され、隔壁部と水集構造物との間は止水されている。従って、隔壁部を水中に配置して隔壁部内の水を排出することにより作業空間を形成することができる。また、隔壁部における第１及び第２の取付端部が水中構造物に取り付けられて、工事の対象となる水中構造物の一部が隔壁部により覆われる。従って、水中構造物の全体を取り囲むように隔壁部を設置する必要がないため、作業空間の形成における施工効率を向上させることができる。さらに、連結止水部では、水中構造物に取り付けられる受け部に対して、隔壁部に固定された押圧部が押し付けられることにより、隔壁部が水中構造物に取り付けられている。従って、水中構造物に対する工事を完了した後に、隔壁部を容易に取り外すことができ、水中構造物に対する工事全体の施工効率を向上させることができる。 In this temporary shut-off structure, the partition wall is connected to the underwater structure by the connection water stop, and the space between the partition and the water collecting structure is stopped. Therefore, the work space can be formed by disposing the partition wall in water and discharging the water in the partition wall. Moreover, the 1st and 2nd attachment edge part in a partition part is attached to an underwater structure, and a part of underwater structure used as construction object is covered by a partition part. Therefore, since it is not necessary to install a partition part so that the whole underwater structure may be surrounded, the construction efficiency in formation of a work space can be improved. Furthermore, in the connection water stop part, the partition part is attached to the underwater structure by pressing the pressing part fixed to the partition part against the receiving part attached to the underwater structure. Therefore, after completing the construction for the underwater structure, the partition wall can be easily removed, and the construction efficiency of the entire construction for the underwater structure can be improved.

また、押圧部は、上下方向に延在し受け部に向かって凸状となる押圧湾曲面を有し、受け部は、上下方向に延在し押圧部に向かって凹状となる受け湾曲面を有し、押圧湾曲面と受け湾曲面との間には弾性を有する止水部材が配置されていることを特徴とする。 The pressing portion has a pressing curved surface extending in the vertical direction and convex toward the receiving portion, and the receiving portion has a receiving curved surface extending in the vertical direction and concave toward the pressing portion. And a water stop member having elasticity is disposed between the pressing curved surface and the receiving curved surface.

連結止水部は、押圧部の押圧湾曲面が受け部の受け湾曲面に対して押し付けられて連結されるヒンジ構造を有している。この構造によれば、上下方向を軸線とした受け湾曲面に対する押圧湾曲面の揺動が可能であるため、押圧部と受け部の間で遊びを持たせることができる。また、押圧湾曲面と受け湾曲面との間には弾性を有する止水部材が配置されているため、受け部に対して押圧部が柔軟に揺動可能であり、且つ押圧部と受け部の間の止水性を確保することができる。さらに、押圧湾曲面が凸状であり受け湾曲面が凹状であるため、受け部に対して押圧部が揺動しても押圧部が受け部から外れることがない。従って、止水性が確保され、水圧により第１及び第２の取付端部に生じる応力が緩和される接続構造を維持することができる。 The connection water stop portion has a hinge structure in which the pressing curved surface of the pressing portion is pressed against the receiving curved surface of the receiving portion to be connected. According to this structure, since the pressing curved surface can swing with respect to the receiving curved surface with the vertical direction as the axis, play can be provided between the pressing portion and the receiving portion. Moreover, since the water stop member which has elasticity is arrange | positioned between a press curved surface and a receiving curved surface, a press part can rock | fluctuate flexibly with respect to a receiving part, and a pressing part and a receiving part It is possible to ensure a waterstop between. Furthermore, since the pressing curved surface is convex and the receiving curved surface is concave, the pressing portion does not come off the receiving portion even if the pressing portion swings with respect to the receiving portion. Accordingly, it is possible to maintain a connection structure in which water-stopping is ensured and stress generated in the first and second attachment end portions is relieved by water pressure.

また、隔壁部には、上下方向に互いに離間し、周方向に延在する周方向補強部材と、隔壁部の中心軸線を挟んで互いに対向し、上下方向に延在する補強柱部材と、が取り付けられていることを特徴とする。この構成によれば、作業空間を形成したときに水圧により隔壁部に作用する力に対して、隔壁部の形状を維持可能な強度を確保することができる。 The partition wall includes a circumferential reinforcing member that is spaced apart from each other in the vertical direction and extends in the circumferential direction, and a reinforcing column member that is opposed to each other across the central axis of the partition wall and extends in the vertical direction. It is attached. According to this configuration, it is possible to ensure the strength capable of maintaining the shape of the partition wall against the force acting on the partition due to water pressure when the work space is formed.

また、水中構造物は、堰柱であることを特徴とする。この構成によれば、堰柱の補修工事を効率よく実施することができる。 The underwater structure is a weir pillar. According to this structure, the repair work of a dam pillar can be implemented efficiently.

また、押圧部は、上下方向に延在し、受け部に向かって凹状となる押圧湾曲面を有し、受け部は、上下方向に延在し、押圧部に向かって凸状となる受け湾曲面を有し、押圧湾曲面と受け湾曲面との間には弾性を有する止水部材が配置されていてもよい。この構造であっても、止水性が確保され、水圧により第１及び第２の取付端部に生じる応力が緩和される接続構造を維持することができる。 The pressing portion has a pressing curved surface that extends in the vertical direction and is concave toward the receiving portion, and the receiving portion extends in the vertical direction and is convex toward the pressing portion. A water stop member having a surface and having elasticity may be disposed between the pressing curved surface and the receiving curved surface. Even with this structure, it is possible to maintain a connection structure in which water-stopping is ensured and stress generated at the first and second attachment end portions is alleviated by water pressure.

本発明によれば、水中構造物の工事に要する作業空間を形成するときの施工効率を向上させることができる。 ADVANTAGE OF THE INVENTION According to this invention, construction efficiency when forming the working space required for construction of an underwater structure can be improved.

本発明に係る仮締切構造体を利用した工事が行われる可動堰を示す全体平面図である。It is a whole top view which shows the movable weir where the construction using the temporary closing structure which concerns on this invention is performed. 図１の可動堰に係る改修工事の一工程を示す平面図である。It is a top view which shows 1 process of the repair work which concerns on the movable weir of FIG. 本発明の第１実施形態に係る仮締切構造体を示す斜視図である。It is a perspective view which shows the temporary cutoff structure concerning 1st Embodiment of this invention. 図３の仮締切構造体を堰柱に取り付けた平面図である。It is the top view which attached the temporary cutoff structure of FIG. 3 to the weir pillar. 図３の仮締切構造体の一部を拡大した断面図である。FIG. 4 is an enlarged cross-sectional view of a part of the temporary cutoff structure in FIG. 3. 図５のＫ部を拡大した断面図である。It is sectional drawing to which the K section of FIG. 5 was expanded. 図３の仮締切構造体の連結止水部の平面図である。It is a top view of the connection water stop part of the temporary closing structure of FIG. 本発明の第２実施形態に係る仮締切構造体を示す平面図である。It is a top view which shows the temporary deadline structure which concerns on 2nd Embodiment of this invention. 本発明の第３実施形態に係る仮締切構造体を示す平面図である。It is a top view which shows the temporary deadline structure which concerns on 3rd Embodiment of this invention.

以下、本発明に係る仮締切構造体の好適な実施形態について、図面を参照して詳細に説明する。 DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of a temporary closing structure according to the present invention will be described in detail with reference to the drawings.

［第１実施形態］
まず、本発明に係る仮締切構造体が取り付けられる水中構造物について説明する。図１に示されるように、可動堰Ｄは、河川の川幅方向に沿って構築されて、上流から下流への流れや潮汐や津波による下流から上流への遡上を制御するものである。可動堰Ｄは、水中に孤立して配置された水中構造物としての堰柱Ｐ１と、河川の両岸にそれぞれ配置された水中構造物としての堰柱Ｐ２と、３台のゲートＧＡとを備えている。可動堰Ｄの改修工事では、可動堰Ｄの機能維持と耐震性の向上を目的として、堰柱Ｐ１，Ｐ２の補強工事とゲートＧＡの交換工事とが行われる。 [First Embodiment]
First, the underwater structure to which the temporary closing structure according to the present invention is attached will be described. As shown in FIG. 1, the movable weir D is constructed along the river width direction of the river, and controls the flow from the upstream to the downstream, the upstream from the downstream to the upstream due to tides and tsunamis. The movable weir D includes a weir pillar P1 as an underwater structure arranged separately in the water, a weir pillar P2 as an underwater structure arranged on both banks of the river, and three gates GA. ing. In the repair work of the movable weir D, the reinforcement work of the weir pillars P1 and P2 and the replacement work of the gate GA are performed for the purpose of maintaining the function of the movable weir D and improving the earthquake resistance.

改修工事の概略工程について説明する。まず、図２（ａ）に示されるように、仮締切ゲート３（図２（ｂ）参照）を堰柱Ｐ１，Ｐ２へ取り付けるための事前工事を実施する。事前工事では、仮締切ゲート戸当たり部２を堰柱Ｐ１，Ｐ２の上流側端部及び下流側端部のそれぞれに形成する。この事前工事にあたっては、施工箇所が水中であるため、作業空間としての仮締切空間を形成する必要がある。そこで、本発明に係る仮締切構造体を用いる。 The outline process of renovation work will be explained. First, as shown in FIG. 2 (a), preliminary construction for attaching the temporary closing gate 3 (see FIG. 2 (b)) to the weir pillars P1, P2 is performed. In the preliminary construction, the temporary closing gate door contact portion 2 is formed on each of the upstream end portion and the downstream end portion of the weir pillars P1, P2. In this preliminary construction, since the construction site is underwater, it is necessary to form a temporary closing space as a work space. Therefore, the temporary closing structure according to the present invention is used.

続いて、図２（ｂ）に示されるように、一方の堰柱Ｐ２と一方の堰柱Ｐ１との間、一方の堰柱Ｐ１と他方の堰柱Ｐ１との間のそれぞれに仮締切ゲート３を取り付ける。また、仮締切ゲート３は、堰柱Ｐ１，Ｐ２の上流側端部の仮締切ゲート戸当たり部２と下流側端部の仮締切ゲート戸当たり部２のそれぞれに取り付けられる。仮締切ゲート３を配置した後に、仮締切ゲート３と堰柱Ｐ１，Ｐ２に囲まれた空間の水を排出して、仮締切空間Ｓを形成する。 Subsequently, as shown in FIG. 2B, the temporary closing gate 3 is provided between the one dam pillar P2 and the one dam pillar P1, and between the one dam pillar P1 and the other dam pillar P1. Install. Further, the temporary closing gate 3 is attached to each of the temporary closing gate door contact portion 2 at the upstream end portion of the weir pillars P1 and P2 and the temporary closing gate door contact portion 2 at the downstream end portion. After the provisional deadline gate 3 is disposed, the water in the space surrounded by the temporary deadline gate 3 and the weir pillars P1 and P2 is discharged to form the temporary deadline space S.

続いて、図２（ｃ）に示されるように既設のゲートＧＡを取り外して新設のゲートＧＢに交換する。また、ゲートＧＢへの交換作業と並行して、堰柱Ｐ１，Ｐ２の補強工事を行う。ゲートＧＢへの交換と堰柱Ｐ１，Ｐ２の補強工事が完了した後に、仮締切空間Ｓに水を注入する。そして、仮締切ゲート３を撤去して改修工事が完了する。ここで、事前工事から仮締切ゲート３を撤去するまでの間は、安全管理のため、施工エリアの土中間隙水圧をモニタリングする。 Subsequently, as shown in FIG. 2C, the existing gate GA is removed and replaced with a new gate GB. In parallel with the replacement work to the gate GB, reinforcement work for the weir pillars P1 and P2 is performed. After the replacement to the gate GB and the reinforcement work of the weir pillars P1 and P2 are completed, water is injected into the temporary closing space S. Then, the temporary deadline gate 3 is removed and the repair work is completed. Here, for the purpose of safety management, the pore water pressure in the soil in the construction area is monitored until the temporary closing gate 3 is removed from the preliminary construction.

図１に示されるように、本発明の第１実施形態に係る仮締切構造体１Ａは、水中に孤立して配置されている堰柱Ｐ１に取り付けられて、事前工事を行うための仮締切空間Ｓ１（図４参照）を形成するものである。堰柱Ｐ１の周辺に仮締切空間Ｓ１を形成する仮締切構造体１Ａは、円筒形状を有し、一例として直径が約７ｍであり高さが約５ｍである。仮締切構造体１Ａの直径は、作業に要する仮締切空間Ｓ１の広さなどに応じて設定され、高さは仮締切構造体１Ａが設置される場所の水深などに応じて設定される。以下、堰柱Ｐ１の下流側端部に取り付けられる仮締切構造体１Ａについて詳細に説明する。 As shown in FIG. 1, a temporary closing structure 1 A according to the first embodiment of the present invention is attached to a weir pillar P 1 that is arranged so as to be isolated in water, and a temporary closing space for performing preliminary work. S1 (see FIG. 4) is formed. The temporary cutoff structure 1A that forms the temporary cutoff space S1 around the weir pillar P1 has a cylindrical shape, and has a diameter of about 7 m and a height of about 5 m as an example. The diameter of the temporary deadline structure 1A is set according to the size of the temporary deadline space S1 required for work, and the height is set according to the water depth at the place where the temporary deadline structure 1A is installed. Hereinafter, the temporary closing structure 1A attached to the downstream end of the weir pillar P1 will be described in detail.

図３に示されるように、仮締切構造体１Ａは、堰柱Ｐ１の下流側端部を部分的に囲って作業空間をなす仮締切空間Ｓ１を形成するものである。仮締切構造体１Ａは、水中において水から隔てられた仮締切空間Ｓ１を形成するための隔壁部１１と、隔壁部１１を堰柱Ｐ１に連結するための連結止水部１２（図４参照）とを有している。 As shown in FIG. 3, the temporary closing structure 1 A forms a temporary closing space S 1 that partially surrounds the downstream end of the weir pillar P 1 and forms a work space. The temporary cutoff structure 1A includes a partition wall portion 11 for forming a temporary cutoff space S1 separated from water in water, and a connection water stop portion 12 for connecting the partition wall portion 11 to the weir pillar P1 (see FIG. 4). And have.

図４に示されるように、円筒状の隔壁部１１は、円周方向の一部が切り欠かれた形状をなしている。言い換えれば、隔壁部１１は、周方向の端部である第１の取付端部１３と第２の取付端部１４とを有しており、第１の取付端部１３と第２の取付端部１４との間には、周方向の一部が開放された開放部Ｇ１が形成されている。仮締切構造体１Ａは、これら第１及び第２の取付端部１３，１４で堰柱Ｐ１の下流側端部を挟むようにして堰柱Ｐ１に取り付けられている。第１及び第２の取付端部１３，１４のなす開口割合Ｅは、隔壁部１１の中心軸線ＡＸを基準とし開放部Ｇ１が設けられていない場合を０％として、およそ２０％〜８０％（角度換算：７２度〜２８８度）の範囲に設定されている。この開口割合Ｅは、隔壁部１１が取り付けられる水中構造物の形状や必要な作業空間の容積・形状などに応じて設定されるものであり、仮締切構造体１Ａでは、開口割合Ｅは２０％（角度換算：７２度）である。 As shown in FIG. 4, the cylindrical partition wall 11 has a shape in which a part in the circumferential direction is cut away. In other words, the partition wall portion 11 includes a first attachment end portion 13 and a second attachment end portion 14 that are circumferential end portions, and the first attachment end portion 13 and the second attachment end portion. Between the part 14, the open part G1 by which a part of circumferential direction was open | released is formed. The temporary cutoff structure 1A is attached to the dam pillar P1 so that the first and second attachment ends 13 and 14 sandwich the downstream end of the dam pillar P1. The opening ratio E formed by the first and second attachment end portions 13 and 14 is approximately 20% to 80% (0% when the open portion G1 is not provided with reference to the central axis AX of the partition wall portion 11). (Angle conversion: 72 degrees to 288 degrees). The opening ratio E is set according to the shape of the underwater structure to which the partition wall 11 is attached and the required volume / shape of the work space. In the temporary closing structure 1A, the opening ratio E is 20%. (Angle conversion: 72 degrees).

図３及び図５に示されるように、隔壁部１１は、複数のライナープレート１６が止水用ゴム部材１５を挟んでボルト（不図示）により締結されて構成されている。ライナープレート１６は、矩形状の薄鋼板を長手方向に湾曲させた形状を有し、ライナープレート１６同士はそれぞれの縁部に取り付けられているフランジ１６ａによって互いに連結可能とされている。このようなライナープレート１６によれば、ライナープレート１６単品の形状と組み合わせる数とを設定することにより、任意の高さと開口割合Ｅとを有する隔壁部１１を容易に構成することができる。また、ライナープレート１６で構築された隔壁部１１は、工事終了後に容易に分解することもできる。 As shown in FIGS. 3 and 5, the partition wall portion 11 is configured by a plurality of liner plates 16 being fastened by bolts (not shown) with a water stop rubber member 15 interposed therebetween. The liner plate 16 has a shape obtained by curving a rectangular thin steel plate in the longitudinal direction, and the liner plates 16 can be connected to each other by flanges 16a attached to respective edges. According to such a liner plate 16, the partition wall portion 11 having an arbitrary height and an opening ratio E can be easily configured by setting the shape of the liner plate 16 alone and the number to be combined. Moreover, the partition part 11 constructed | assembled with the liner plate 16 can also be decompose | disassembled easily after construction completion.

図４に示されるように、隔壁部１１は、水中において作業空間を形成したときには、周囲の水から水圧Ｆを受けるため、水圧Ｆに耐え得る所定の強度を確保する必要がある。そこで、図３に示されるように、隔壁部１１には、上下方向に互いに離間し、円周方向に延在する補強リング（周方向補強部材）１７と、隔壁部１１の中心軸線ＡＸを挟んで互いに対向し、上下方向に延在するバーチカルスチフネス（補強柱部材）１８と、が取り付けられている。 As shown in FIG. 4, the partition wall 11 receives the water pressure F from the surrounding water when the work space is formed in the water, so it is necessary to ensure a predetermined strength that can withstand the water pressure F. Therefore, as shown in FIG. 3, the partition wall 11 sandwiches a reinforcing ring (circumferential reinforcing member) 17 that is spaced apart from each other in the vertical direction and extends in the circumferential direction, and the central axis AX of the partition wall 11. The vertical stiffness (reinforcing column member) 18 facing each other and extending in the vertical direction is attached.

補強リング１７は、隔壁部１１おいて第１の取付端部１３から第２の取付端部１４に亘って延びた円弧状のＨ型鋼（図５参照）である。補強リング１７は、隔壁部１１の上端に配置されると共に、隔壁部１１の上端から下方に向かって約２ｍ間隔で配置されている。また、補強リング１７は、ライナープレート１６に挟まれて、ボルト締結によって隔壁部１１に取り付けられている（図５参照）。 The reinforcing ring 17 is an arc-shaped H-shaped steel (see FIG. 5) that extends from the first attachment end 13 to the second attachment end 14 in the partition wall 11. The reinforcing ring 17 is disposed at the upper end of the partition wall 11 and is disposed at an interval of about 2 m downward from the upper end of the partition wall 11. The reinforcing ring 17 is sandwiched between the liner plates 16 and attached to the partition wall 11 by bolt fastening (see FIG. 5).

バーチカルスチフネス１８は、隔壁部１１の内周面及び外周面に配置された山形鋼（Ｌ型鋼）であり、バーチカルスチフネス１８の長手方向が上下方向に沿うように、隔壁部１１の上端から下端に亘って隔壁部１１に取り付けられている。また、バーチカルスチフネス１８は、一例として、隔壁部１１の中心軸線ＡＸに対して約１５度の中心角を持って複数配置されている（図４参照）。そして、隔壁部１１の中心軸線ＡＸを挟んで略対向する位置に配置されたバーチカルスチフネス１８の位置には、隔壁部１１を吊り上げるための吊り部材１９が取り付けられている。 The vertical stiffness 18 is an angle steel (L-shaped steel) disposed on the inner and outer peripheral surfaces of the partition wall 11 and extends from the upper end to the lower end of the partition 11 so that the longitudinal direction of the vertical stiffness 18 is along the vertical direction. Attached to the partition wall 11. Further, as an example, a plurality of vertical stiffnesses 18 are arranged with a central angle of about 15 degrees with respect to the central axis AX of the partition wall 11 (see FIG. 4). A suspension member 19 for lifting the partition wall 11 is attached to a position of the vertical stiffness 18 that is disposed substantially opposite to the center axis AX of the partition wall 11.

隔壁部１１は、水から隔離された作業空間を形成するため、隔壁部１１とフーチング２１（図３参照）との間と、隔壁部１１と堰柱Ｐ１，Ｐ２との間（図４参照）とは水の出入りがないように止水された状態で連結する必要がある。 The partition wall 11 forms a work space isolated from water, so that it is between the partition wall 11 and the footing 21 (see FIG. 3) and between the partition wall 11 and the weir pillars P1 and P2 (see FIG. 4). Must be connected in a state where the water is stopped so that there is no water going in and out.

隔壁部１１とフーチング２１との間の連結構造について説明する。図５に示されるように、バーチカルスチフネス１８の下端には隔壁部１１の半径方向に延在する連結板２２が取り付けられている。連結板２２とフーチング２１の間には、ブチルを含むスポンジゴムからなる止水用ゴム部材２３が挟み込まれている。この連結板２２には、ボルト穴が形成され、ボルト穴にはフーチング２１に配置された埋め込みボルトＢが挿通されている。ボルト穴に挿通された埋め込みボルトＢには上端部からナットＮが取り付けられて、ナットＮはフーチング２１に向かう方向に締め付けられている。 A connection structure between the partition wall 11 and the footing 21 will be described. As shown in FIG. 5, a connecting plate 22 extending in the radial direction of the partition wall 11 is attached to the lower end of the vertical stiffness 18. Between the connecting plate 22 and the footing 21, a water-stopping rubber member 23 made of sponge rubber containing butyl is sandwiched. Bolt holes are formed in the connecting plate 22, and embedded bolts B arranged in the footing 21 are inserted into the bolt holes. A nut N is attached to the embedded bolt B inserted through the bolt hole from the upper end, and the nut N is tightened in a direction toward the footing 21.

この埋め込みボルトＢによれば、浮力に対抗するように隔壁部１１の全体がフーチング２１に固定される。また、止水用ゴム部材２３によれば、隔壁部１１が取り付けられるコンクリート製のフーチング２１表面に凹凸がある場合でも、ナットＮの締め付けにより止水用ゴム部材２３が圧縮されて凹凸に倣うため、隔壁部１１とフーチング２１との間を確実に止水することができる。 According to the embedded bolt B, the entire partition wall 11 is fixed to the footing 21 so as to oppose buoyancy. Further, according to the water-stopping rubber member 23, even when the surface of the concrete footing 21 to which the partition wall 11 is attached has irregularities, the water-stopping rubber member 23 is compressed by tightening the nut N to follow the irregularities. The water between the partition wall 11 and the footing 21 can be reliably stopped.

また、図６に示されるように、隔壁部１１の最下段に配置されたライナープレート１６のフランジ１６ａはフーチング２１に対してボルトＢ及びナットＮにより固定されている。そして、フランジ１６ａと連結板２２との間には、止水部材としてのブチルゴムシート２４が挟み込まれている。 Further, as shown in FIG. 6, the flange 16 a of the liner plate 16 disposed at the lowermost stage of the partition wall 11 is fixed to the footing 21 by bolts B and nuts N. A butyl rubber sheet 24 as a water stop member is sandwiched between the flange 16a and the connecting plate 22.

次に、隔壁部１１と堰柱Ｐ１，Ｐ２との間の連結構造について説明する。図４に示されるように、隔壁部１１の第１の取付端部１３は堰柱Ｐ１の側壁Ｐ１ａに対して連結止水部１２によって連結されている。また、隔壁部１１の第２の取付端部１４は堰柱Ｐ１の側壁Ｐ１ｂに対して別の連結止水部１２によって連結されている。ここで、第１の取付端部１３と側壁Ｐ１ａの間の連結止水部１２と、第２の取付端部１４と側壁Ｐ１ｂの間の連結止水部１２と、は互いに同様の構成を有する。従って、以下、第２の取付端部１４と側壁Ｐ１ｂの間の連結止水部１２について説明し、第１の取付端部１３と側壁Ｐ１ａの間の連結止水部１２の説明を省略する。 Next, a connection structure between the partition wall 11 and the weir pillars P1 and P2 will be described. As shown in FIG. 4, the first attachment end portion 13 of the partition wall portion 11 is connected to the side wall P1a of the weir pillar P1 by the connection water stop portion 12. Moreover, the 2nd attachment end part 14 of the partition part 11 is connected with the side wall P1b of the dam pillar P1 by another connection water stop part 12. FIG. Here, the connection water stop part 12 between the 1st attachment end part 13 and the side wall P1a, and the connection water stop part 12 between the 2nd attachment end part 14 and the side wall P1b have the mutually same structure. . Therefore, hereinafter, the connection water stop portion 12 between the second attachment end portion 14 and the side wall P1b will be described, and the description of the connection water stop portion 12 between the first attachment end portion 13 and the side wall P1a will be omitted.

図７に示されるように、連結止水部１２は、堰柱Ｐ１の側壁Ｐ１ｂに固定された受け部２６と、隔壁部１１の第２の取付端部１４に固定された押圧部２７とを有している。受け部２６に対して押圧部２７が水圧で押し付けられるヒンジ構造をなして、隔壁部１１が堰柱Ｐ１に取り付けられている。また、押圧部２７の押し付け方向Ｈ１と側壁Ｐ１ｂとの間の角度ＥＢは、略９０度であるが、押圧部２７と受け部２６との間には、上下方向を中心軸線とする揺動方向Ｈ２に沿った遊びが設けられているため、水圧分布の変化に応じて押し付け方向Ｈ１と側壁Ｐ１ｂとの間の角度ＥＢは変化する。 As shown in FIG. 7, the connection water stop portion 12 includes a receiving portion 26 fixed to the side wall P1b of the dam pillar P1 and a pressing portion 27 fixed to the second attachment end portion 14 of the partition wall portion 11. Have. The partition portion 11 is attached to the dam pillar P1 in a hinge structure in which the pressing portion 27 is pressed against the receiving portion 26 with water pressure. In addition, the angle EB between the pressing direction H1 of the pressing portion 27 and the side wall P1b is approximately 90 degrees, but between the pressing portion 27 and the receiving portion 26, the swinging direction with the vertical axis as the central axis. Since play along H2 is provided, the angle EB between the pressing direction H1 and the side wall P1b changes according to the change in the water pressure distribution.

受け部２６は、押圧部２７が押し付けられる断面半円状の受け湾曲面Ｃ１を有する本体部２８と、本体部２８と側壁Ｐ１ｂとの間に挟み込まれた止水ゴム２９とを有している。本体部２８は、上下方向（水深方向）に延在し、押圧部２７に向かって凹状となる受け湾曲部２８ａと、受け湾曲部２８ａを隔壁部１１の半径方向に挟むと共に上下方向に延在するフランジ２８ｂとを有している。このフランジ２８ｂに設けられたボルト穴には、堰柱Ｐ１に設けられた埋め込みボルトＢが挿通され、ナットＮが締め付けられている。受け湾曲部２８ａは、フランジ２８ｂに対して隔壁部１１側に突出すると共に凹状の受け湾曲面Ｃ１が形成されている。受け湾曲面Ｃ１には、止水ゴムパッキン３１が取り付けられている。 The receiving portion 26 includes a main body portion 28 having a receiving curved surface C1 having a semicircular cross section to which the pressing portion 27 is pressed, and a water stop rubber 29 sandwiched between the main body portion 28 and the side wall P1b. . The main body 28 extends in the vertical direction (water depth direction), and receives the curved curved portion 28a that is concave toward the pressing portion 27, and sandwiches the curved curved portion 28a in the radial direction of the partition wall 11 and extends in the vertical direction. And a flange 28b. The embedded bolt B provided on the weir pillar P1 is inserted into the bolt hole provided on the flange 28b, and the nut N is tightened. The receiving curved portion 28a protrudes toward the partition wall 11 with respect to the flange 28b and has a concave receiving curved surface C1. A water stop rubber packing 31 is attached to the receiving curved surface C1.

この構造によれば、ナットＮを締め付けることにより、本体部２８が側壁Ｐ１ｂ側に押し付けられ、更に本体部２８と側壁Ｐ１ｂとの間の止水ゴム２９が圧縮されるため、側壁Ｐ１ｂ表面に凹凸がある場合であっても本体部２８と側壁Ｐ１ｂとの間の止水性を高めることができる。 According to this structure, by tightening the nut N, the main body portion 28 is pressed against the side wall P1b, and the waterproof rubber 29 between the main body portion 28 and the side wall P1b is compressed, so that the surface of the side wall P1b is uneven. Even in the case where there is, the water stoppage between the main body 28 and the side wall P1b can be increased.

押圧部２７は、上下方向に延在し、受け部２６に向かって凸状となる押圧湾曲面Ｃ２を有する押圧凸部２７ａと、押圧凸部２７ａを隔壁部１１の半径方向に挟むと共に上下方向に延在するフランジ２７ｂとを有している。揺動方向Ｈ２に沿った遊びを持たせるため、押圧湾曲面Ｃ２の半径は、受け湾曲面Ｃ１の半径よりも小さくされている。第２の取付端部１４は、ライナープレート１６を挟むように補強リング１７に固定された断面コ字状の固定チャンネル３２を有している。この固定チャンネル３２のフランジ３２ａに対して、押圧部２７のフランジ２７ｂがボルトにより固定されている。押圧凸部２７ａには、フランジ２７ｂに対して堰柱Ｐ１側に突出するように凸状の押圧湾曲面Ｃ２が形成されている。押圧湾曲面Ｃ２には、断面半円状の止水ゴムパッキン３３が取り付けられている。 The pressing portion 27 extends in the vertical direction and has a pressing convex portion 27a having a pressing curved surface C2 that is convex toward the receiving portion 26, and the pressing convex portion 27a is sandwiched in the radial direction of the partition wall portion 11 and in the vertical direction. And a flange 27b extending to the center. In order to have play along the swing direction H2, the radius of the pressing curved surface C2 is made smaller than the radius of the receiving curved surface C1. The second attachment end 14 has a fixed channel 32 having a U-shaped cross section fixed to the reinforcing ring 17 so as to sandwich the liner plate 16. The flange 27b of the pressing portion 27 is fixed to the flange 32a of the fixed channel 32 by a bolt. A convex pressing curved surface C2 is formed on the pressing convex portion 27a so as to protrude toward the weir pillar P1 with respect to the flange 27b. A waterproof rubber packing 33 having a semicircular cross section is attached to the pressing curved surface C2.

仮締切構造体１Ａを用いた事前工事の工程について説明する。図３に示されるように、陸上において、ライナープレート１６の間に止水用ゴム部材１５を挟み込みつつ、ボルトにより連結して隔壁部１１を形成する。このとき、補強リング１７をライナープレート１６同士の間に挟み込む。続いて、隔壁部１１の外周面及び内周面にバーチカルスチフネス１８を取り付けると共に、所定のバーチカルスチフネス１８の上端部に吊り部材１９を取り付ける。また、第１及び第２の取付端部１３，１４に、連結止水部１２をなす押圧部２７を取り付ける。また、堰柱Ｐ１の側壁Ｐ１ｂにボルトＢを埋め込み、止水ゴム２９を挟んで連結止水部１２をなす本体部２８を固定する。 The preliminary construction process using the temporary closing structure 1A will be described. As shown in FIG. 3, on the land, the partition wall 11 is formed by connecting the rubber member 15 for water stop between the liner plates 16 and connecting them with bolts. At this time, the reinforcing ring 17 is sandwiched between the liner plates 16. Subsequently, the vertical stiffness 18 is attached to the outer peripheral surface and the inner peripheral surface of the partition wall portion 11, and the suspension member 19 is attached to the upper end portion of the predetermined vertical stiffness 18. Further, a pressing portion 27 that forms the connection water stop portion 12 is attached to the first and second attachment end portions 13 and 14. Further, the bolt B is embedded in the side wall P1b of the dam pillar P1, and the main body 28 forming the connection water stop portion 12 is fixed with the water stop rubber 29 interposed therebetween.

続いて、隔壁部１１を堰柱Ｐ１に取り付ける。より詳細には、第１の取付端部１３における押圧部２７の押圧湾曲面Ｃ２を堰柱Ｐ１の側壁Ｐ１ａに固定された受け部２６における受け湾曲面Ｃ１に嵌めこむ。更に、第２の取付端部１４における押圧部２７の押圧湾曲面Ｃ２を堰柱Ｐ１の側壁Ｐ１ｂに固定された受け部２６における受け湾曲面Ｃ１に嵌めこむ。そして、隔壁部１１の下端部をフーチング２１に固定する。以上の工程により、堰柱Ｐ１の作業対象領域Ｐ１Ｌのための仮締切空間Ｓ１が形成される。 Subsequently, the partition wall 11 is attached to the weir pillar P1. More specifically, the pressing curved surface C2 of the pressing portion 27 at the first attachment end 13 is fitted into the receiving curved surface C1 of the receiving portion 26 fixed to the side wall P1a of the weir pillar P1. Further, the pressing curved surface C2 of the pressing portion 27 in the second attachment end portion 14 is fitted into the receiving curved surface C1 in the receiving portion 26 fixed to the side wall P1b of the weir pillar P1. Then, the lower end of the partition wall 11 is fixed to the footing 21. Through the above steps, the temporary closing space S1 for the work target area P1L of the weir pillar P1 is formed.

続いて、隔壁部１１の内部の水を排出する。図４に示されるように、水を排出していくと、隔壁部１１には、隔壁部１１の中心軸線ＡＸに向かう水圧Ｆが作用するようになる。ここで、堰柱Ｐ１に取り付けるための開放部Ｇ１には水圧が作用しないが、開放部Ｇ１に対向する隔壁部１１の領域Ｇ２には水圧Ｆａが作用する。従って、この領域Ｇ２に作用する水圧により隔壁部１１が押し付けられることになる。 Subsequently, the water inside the partition wall 11 is discharged. As shown in FIG. 4, when the water is discharged, the water pressure F toward the central axis AX of the partition wall 11 acts on the partition wall 11. Here, the water pressure does not act on the open portion G1 to be attached to the dam pillar P1, but the water pressure Fa acts on the region G2 of the partition wall portion 11 facing the open portion G1. Accordingly, the partition wall 11 is pressed by the water pressure acting on the region G2.

この仮締切構造体１Ａでは、隔壁部１１が、連結止水部１２によって堰柱Ｐ１に連結され、隔壁部１１と堰柱Ｐ１との間は止水されている。従って、隔壁部１１を水中に配置して隔壁部１１内の水を排出することにより仮締切空間Ｓ１を形成することができる。 In the temporary cutoff structure 1A, the partition wall 11 is connected to the weir pillar P1 by the connection water stop part 12, and the space between the partition wall 11 and the weir pillar P1 is stopped. Accordingly, the temporary cutoff space S1 can be formed by disposing the partition wall 11 in water and discharging the water in the partition wall 11.

また、隔壁部１１における第１及び第２の取付端部１３，１４が堰柱Ｐ１に取り付けられて、工事の対象となる堰柱Ｐ１の一部が隔壁部１１により覆われる。従って、堰柱Ｐ１の全体を取り囲むように隔壁部１１を設置する必要がないため、仮締切空間Ｓ１の形成における施工効率を向上させることができる。 Further, the first and second attachment end portions 13 and 14 in the partition wall portion 11 are attached to the dam pillar P 1, and a part of the dam pillar P 1 to be constructed is covered with the partition wall portion 11. Therefore, since it is not necessary to install the partition wall 11 so as to surround the entire weir pillar P1, it is possible to improve the construction efficiency in the formation of the temporary closing space S1.

ところで、隔壁部１１を堰柱Ｐ１，Ｐ２に対して連結する構造として、例えば、堰柱Ｐ１，Ｐ２の側壁に止水コンクリート製の凸部を形成し、この凸部に隔壁部１１の第１及び第２の取付端部１３，１４を埋め込む比較例に係る構成が考えられる。しかし、止水コンクリートへの埋め込み構造では、堰柱Ｐ１への隔壁部１１の取付剛性が高くなる。また、隔壁部１１の設置個所が河川中である場合には、水圧の状態も常時変化する。止水コンクリートへの埋め込み構造では、隔壁部１１に作用する水圧の分布が変化に応じて隔壁部１１の連結姿勢が変化することが難しく、第１及び第２の取付端部１３，１４に大きな応力が生じることになる。 By the way, as a structure which connects the partition part 11 with respect to the dam pillars P1 and P2, for example, a convex part made of water-stopping concrete is formed on the side walls of the dam pillars P1 and P2, and the first part of the partition part 11 is formed on this convex part. And the structure which concerns on the comparative example which embeds the 2nd attachment edge parts 13 and 14 can be considered. However, in the structure embedded in still water concrete, the mounting rigidity of the partition wall 11 to the weir pillar P1 is increased. Moreover, when the installation location of the partition part 11 is in a river, the state of water pressure always changes. In the structure embedded in still water concrete, it is difficult for the connection posture of the partition wall portion 11 to change according to the change in the distribution of the water pressure acting on the partition wall portion 11, and the first and second mounting end portions 13 and 14 are large. Stress will occur.

仮締切構造体１Ａの連結止水部１２は、押圧部２７の押圧湾曲面Ｃ２が受け部２６の受け湾曲面Ｃ１に対して押し付けられて連結されるヒンジ構造を有している。この構造によれば、上下方向を軸線とした受け湾曲面Ｃ１に対する押圧湾曲面Ｃ２の揺動が可能であるため、押圧部２７と受け部２６の間で揺動方向Ｈ２（図７参照）に沿った遊びを持たせることができる。 The connection water stop portion 12 of the temporary cutoff structure 1 A has a hinge structure in which the pressing curved surface C 2 of the pressing portion 27 is pressed against the receiving curved surface C 1 of the receiving portion 26. According to this structure, the pressing curved surface C2 can be swung with respect to the receiving curved surface C1 with the vertical direction as an axis, and therefore, the rocking direction H2 (see FIG. 7) between the pressing portion 27 and the receiving portion 26. You can have play along.

さらに、押圧湾曲面Ｃ２と受け湾曲面Ｃ１との間には弾性を有する止水ゴムパッキン３１，３３が配置されているため、受け部２６に対して押圧部２７が柔軟に揺動可能であり、且つ押圧部２７と受け部２６の間の止水性を確保することができる。 Furthermore, since the waterproof rubber packings 31 and 33 having elasticity are disposed between the pressing curved surface C2 and the receiving curved surface C1, the pressing portion 27 can swing flexibly with respect to the receiving portion 26. And the water stop property between the pressing part 27 and the receiving part 26 can be ensured.

また、押圧湾曲面Ｃ２が凸状であり受け湾曲面Ｃ１が凹状であるため、受け部２６に対して押圧部２７が揺動方向Ｈ２に沿って揺動しても押圧部２７が受け部２６から外れることがない。従って、止水性が確保され、水圧により第１及び第２の取付端部１３，１４に生じる応力が緩和される接続構造を維持することができる。 Further, since the pressing curved surface C2 is convex and the receiving curved surface C1 is concave, even if the pressing portion 27 swings along the swinging direction H2 with respect to the receiving portion 26, the pressing portion 27 remains in the receiving portion 26. It will not come off. Accordingly, it is possible to maintain a connection structure in which water-stopping is ensured and stress generated in the first and second attachment end portions 13 and 14 is relieved by water pressure.

さらに、連結止水部１２では、堰柱Ｐ１に取り付けられた受け部２６に対して、隔壁部１１に固定された押圧部２７が押し付けられることにより、隔壁部１１が堰柱Ｐ１に取り付けられている。従って、堰柱Ｐ１に対する工事を完了した後に、隔壁部１１を容易に取り外すことができ、堰柱Ｐ１に対する工事全体の施工効率を向上させることができる。 Furthermore, in the connection water stop part 12, when the press part 27 fixed to the partition part 11 is pressed with respect to the receiving part 26 attached to the dam pillar P1, the partition part 11 is attached to the dam pillar P1. Yes. Therefore, after completing the construction for the dam pillar P1, the partition wall portion 11 can be easily removed, and the construction efficiency of the whole construction for the dam pillar P1 can be improved.

また、補強リング１７及びバーチカルスチフネス１８によれば、仮締切空間Ｓ１を形成したときに隔壁部１１に作用する水圧Ｆに対して、隔壁部１１の形状を維持可能な強度を確保することができる。 Further, according to the reinforcing ring 17 and the vertical stiffness 18, it is possible to ensure the strength capable of maintaining the shape of the partition wall portion 11 against the water pressure F acting on the partition wall portion 11 when the temporary closing space S1 is formed. .

また、仮締切構造体１Ａは、作業性のよい陸上で構築されるため、水中における作業を連結止水部１２における連結作業と、隔壁部１１とフーチング２１との連結作業とにすることができる。従って、仮締切空間の施工効率を向上させることができる。 In addition, since the temporary closing structure 1A is constructed on land with good workability, the work in water can be used as a connection work in the connection water stop part 12 and a connection work between the partition wall part 11 and the footing 21. . Therefore, the construction efficiency of the temporary closing space can be improved.

また、仮締切構造体１Ａの隔壁部１１は円筒状であるため、水中において隔壁部１１には中心軸線ＡＸに向かう水圧を隔壁部１１に対して均等に作用させることができる。 In addition, since the partition wall 11 of the temporary cutoff structure 1A is cylindrical, the water pressure toward the central axis AX can be applied to the partition wall 11 evenly in the partition wall 11 in water.

［第２実施形態］
図８に示されるように、第２実施形態に係る仮締切構造体１Ｂは、開口割合Ｅが５０％（角度換算：１８０度）である点で仮締切構造体１Ａと相違している。仮締切構造体１Ｂは、河川の両岸に設置された堰柱Ｐ２の上流側端部の作業対象領域Ｐ２Ｍを囲むように配置される（図１参照）。仮締切構造体１Ｂの第１の取付端部３４は連結止水部１２によって堰柱Ｐ２の側壁Ｐ２ａに取り付けられ、第２の取付端部３６は別の連結止水部１２によって河川岸に設置された矢板３７に取り付けられている。 [Second Embodiment]
As shown in FIG. 8, the temporary closing structure 1B according to the second embodiment is different from the temporary closing structure 1A in that the opening ratio E is 50% (angle conversion: 180 degrees). The temporary cutoff structure 1B is disposed so as to surround the work target area P2M at the upstream end of the weir pillar P2 installed on both banks of the river (see FIG. 1). The first attachment end 34 of the temporary cutoff structure 1B is attached to the side wall P2a of the weir pillar P2 by the connection water stop 12, and the second attachment end 36 is installed on the riverbank by another connection water stop 12. Attached to the sheet pile 37.

仮締切構造体１Ｂであっても、第１及び第２の取付端部３４，３６を、連結止水部１２を介して堰柱Ｐ２及び矢板３７に取り付けることができる。仮締切構造体１Ｂは、隔壁部１１に作用する水圧Ｆによって、隔壁部１１に固定されたそれぞれの押圧部２７が、堰柱Ｐ２側及び矢板３７側に押し付けられるため、止水コンクリートによる埋め込み構造によらず、作業対象領域Ｐ２Ｍのための仮締切空間Ｓ２を形成することができる。従って、第１実施形態に係る仮締切構造体１Ａと同様の効果を得ることができる。 Even in the temporary cutoff structure 1 B, the first and second attachment end portions 34 and 36 can be attached to the dam pillar P 2 and the sheet pile 37 via the connection water stop portion 12. The temporary cutoff structure 1B is embedded in water-stopped concrete because each pressing portion 27 fixed to the partition wall portion 11 is pressed against the dam pillar P2 side and the sheet pile 37 side by the water pressure F acting on the partition wall portion 11. Regardless, the provisional deadline space S2 for the work target area P2M can be formed. Therefore, the same effect as that of the temporary closing structure 1A according to the first embodiment can be obtained.

図９に示されるように、第３実施形態に係る仮締切構造体１Ｃは、開口割合Ｅが７５％（角度換算：２７０度）である点で仮締切構造体１Ａと相違している。仮締切構造体１Ｃは、河川の両岸に設置された堰柱Ｐ２の下流側端部の作業対象領域Ｐ２Ｎを囲むように配置される（図１参照）。仮締切構造体１Ｃの第１の取付端部３８は連結止水部１２によって堰柱Ｐ２の側壁Ｐ２ａに取り付けられ、第２の取付端部３９は別の連結止水部１２によって河川岸から川幅方向に向かって並設された矢板４１に取り付けられている。 As shown in FIG. 9, the temporary closing structure 1C according to the third embodiment is different from the temporary closing structure 1A in that the opening ratio E is 75% (angle conversion: 270 degrees). The temporary cutoff structure 1C is disposed so as to surround the work target region P2N at the downstream end portion of the weir pillar P2 installed on both banks of the river (see FIG. 1). The first attachment end portion 38 of the temporary cutoff structure 1C is attached to the side wall P2a of the weir pillar P2 by the connection water stop portion 12, and the second attachment end portion 39 is connected to the river bank from the riverbank by another connection water stop portion 12. It is attached to a sheet pile 41 arranged side by side in the direction.

仮締切構造体１Ｃであっても、第１及び第２の取付端部３８，３９を、連結止水部１２を介して堰柱Ｐ２及び矢板４１に取り付けることができる。仮締切構造体１Ｃは、隔壁部１１に作用する水圧Ｆによって隔壁部１１に固定されたそれぞれの押圧部２７が、堰柱Ｐ２側及び矢板４１側に押し付けられるため、止水コンクリートによる埋め込み構造によらず、作業対象領域Ｐ２Ｎのための仮締切空間Ｓ３を形成することができる。従って、第１実施形態に係る仮締切構造体１Ａと同様の効果を得ることができる。 Even in the temporary cutoff structure 1 C, the first and second attachment end portions 38 and 39 can be attached to the dam pillar P 2 and the sheet pile 41 via the connection water stop portion 12. The temporary cutoff structure 1C has an embedded structure of water-stopped concrete, because the respective pressing portions 27 fixed to the partition wall portion 11 by the water pressure F acting on the partition wall portion 11 are pressed against the dam pillar P2 side and the sheet pile 41 side. Regardless, the temporary closing space S3 for the work target area P2N can be formed. Therefore, the same effect as that of the temporary closing structure 1A according to the first embodiment can be obtained.

本発明は、前述した実施形態に限定されず、本発明の要旨を逸脱しない範囲で、下記のような種々の変形が可能である。 The present invention is not limited to the above-described embodiment, and various modifications as described below are possible without departing from the gist of the present invention.

連結止水部１２は、隔壁部１１の第１及び第２の取付端部１３，１４のいずれか一方に配置され、他方は止水コンクリートへの埋め込み構造やボルト連結構造により水中構造物へ連結されてもよい。このような構造であっても、仮締切構造体１Ａは遊びを生じさせる連結止水部１２を備えているので水圧分布の変化に対応して、隔壁部１１に過大な応力が生じることを抑制できる。 The connection water stop part 12 is arrange | positioned in any one of the 1st and 2nd attachment edge parts 13 and 14 of the partition part 11, and the other is connected to an underwater structure by the embedding structure to a water stop concrete, or a bolt connection structure. May be. Even in such a structure, the temporary closing structure 1A includes the connection water stop portion 12 that causes play, and therefore, it is possible to suppress an excessive stress from being generated in the partition wall portion 11 in response to a change in the water pressure distribution. it can.

また、連結止水部１２では、押圧湾曲面Ｃ２が受け部２６に向かって凹状であり、受け湾曲面Ｃ１が押圧部２７に向かって凸状であってもよい。 Moreover, in the connection water stop part 12, the pressing curved surface C2 may be concave toward the receiving part 26, and the receiving curved surface C1 may be convex toward the pressing part 27.

また、仮締切構造体１Ａ〜１Ｃが取り付けられる水中構造物は、可動堰の堰柱に限定されず、橋梁の橋脚等その他の水中構造物に取り付けて工事のための作業空間を形成するために用いてもよい。 In addition, the underwater structure to which the temporary closing structures 1A to 1C are attached is not limited to the weir pillar of the movable weir, but is attached to other underwater structures such as bridge piers to form a work space for construction. It may be used.

１Ａ〜１Ｃ…仮締切構造体、１１…隔壁部、１２…連結止水部、１３…第１の取付端部、１４…第２の取付端部、１７…補強リング（周方向補強部材）、１８…バーチカルスチフネス（補強柱部材）、２６…受け部、２７…押圧部、Ｃ１…受け湾曲面、Ｃ２…押圧湾曲面、Ｐ１，Ｐ２…堰柱、Ｓ１〜Ｓ３…仮締切空間。 DESCRIPTION OF SYMBOLS 1A-1C ... Temporary cutoff structure, 11 ... Partition part, 12 ... Connection water stop part, 13 ... 1st attachment end part, 14 ... 2nd attachment end part, 17 ... Reinforcement ring (circumferential reinforcement member), 18 ... Vertical stiffness (reinforcing column member), 26 ... receiving portion, 27 ... pressing portion, C1 ... receiving curved surface, C2 ... pressing curved surface, P1, P2 ... weir pillar, S1 to S3 ... temporary closing space.

Claims

In the temporary closing structure that forms a work space around the underwater structure provided in the water,
A partition portion having first and second attachment end portions for attachment to the underwater structure, extending in an arc shape so as to cover a part of the underwater structure, and forming the work space;
It arrange | positions at least one between the said 1st attachment edge part and the said underwater structure, and between the said 2nd attachment edge part and the said underwater structure, and connects the said partition part to the said underwater structure. And the connection water stop part which stops water between the partition and the underwater structure,
With
The connection water stop part is
A receiving part fixed to the underwater structure;
A pressing part fixed to the partition part and pressed against the receiving part by water pressure,
The pressing portion has a pressing curved surface that extends in the vertical direction and is convex toward the receiving portion,
The receiving part has a receiving curved surface that extends in the vertical direction and becomes concave toward the pressing part,
The temporary closing structure according to claim 1, wherein a radius of the pressing curved surface is smaller than a radius of the receiving curved surface.

In the temporary closing structure that forms a work space around the underwater structure provided in the water,
A partition portion having first and second attachment end portions for attachment to the underwater structure, extending in an arc shape so as to cover a part of the underwater structure, and forming the work space;
It is arrange | positioned at least one between the said 1st attachment end part and the said underwater structure, and between the said 2nd attachment end part and the said underwater structure, and connects the said partition part to the said underwater structure. And the connection water stop part which stops water between the partition and the underwater structure,
With
The connection water stop part is
A receiving part fixed to the underwater structure;
A pressing part fixed to the partition part and pressed against the receiving part by water pressure,
The pressing portion has a pressing curved surface that extends in the vertical direction and is concave toward the receiving portion,
The receiving portion has a receiving curved surface that extends in the vertical direction and is convex toward the pressing portion,
The temporary fastening structure according to claim 1, wherein a radius of the receiving curved surface is smaller than a radius of the pressing curved surface.

The temporary closing structure according to claim 1 or 2, wherein a water-stopping member having elasticity is disposed between the pressing curved surface and the receiving curved surface.

In the temporary closing structure that forms a work space around the underwater structure provided in the water,
A partition portion having first and second attachment end portions for attachment to the underwater structure, extending in an arc shape so as to cover a part of the underwater structure, and forming the work space;
It arrange | positions at least one between the said 1st attachment edge part and the said underwater structure, and between the said 2nd attachment edge part and the said underwater structure, and connects the said partition part to the said underwater structure. With
A connection water stop portion for stopping water between the partition wall portion and the underwater structure;
With
The connection water stop part is
A receiving part fixed to the underwater structure;
A pressing part fixed to the partition part and pressed against the receiving part by water pressure,
The underwater structure is a dam pillar constituting a movable weir,
A temporary closing structure characterized in that the upstream end portion or the downstream end portion of the weir pillar is sandwiched between the first attachment end portion and the second attachment end portion.

The circumferential partition member that is spaced apart from each other in the vertical direction and extends in the circumferential direction and the reinforcing column member that extends in the vertical direction are attached to the partition wall. The temporary closing structure according to any one of 4 .

The connection water stop portion is disposed between the first attachment end portion and the underwater structure, and between the second attachment end portion and the underwater structure, respectively. The temporary cutoff structure according to any one of claims 1 to 5 .