JP6832496B2 - Construction method of intake / discharge port structure - Google Patents

Description

本発明は、例えば発電施設などで冷却用の水を取水／放水するための取放水口構造の施工方法に関する。 The present invention relates to a method of constructing an intake / discharge port structure for taking / discharging cooling water, for example, in a power generation facility.

従来、発電施設などには、冷却用の水を取水あるいは放水するための取水設備や放水設備が設けられている（例えば、特許文献１参照）。 Conventionally, a power generation facility or the like is provided with a water intake facility or a water discharge facility for taking in or discharging cooling water (see, for example, Patent Document 1).

また、この種の取水設備や放水設備の取水口構造、放水口構造（取放水口構造）は、例えば、地上の取水ピットや放水ピットから海底や湖底などの水底まで取水路や放水路をシールドトンネルとして構築し、このシールドトンネルを到達／接続するようにして水底に構築される。 In addition, this type of water intake facility and water discharge facility intake structure and water discharge port structure (water intake / discharge port structure) shields the intake channel and the water discharge channel from the water intake pit and the water discharge pit on the ground to the water bottom such as the seabed and the lake bottom, for example. It is constructed as a tunnel, and is constructed on the bottom of the water so as to reach / connect this shield tunnel.

具体的に、水底（水中）に構築される取放水口構造は、図３１、図３２に示すように、水上から水底Ｇ１の地盤Ｇに鋼矢板１を打設し、水底管路接続部（水中立坑）Ｓの施工領域を区画するとともに鋼矢板１で囲まれた内部の水底地盤Ｇを所定深度まで掘削除去し、水中立坑を構築する。そして、水中立坑の内側にＪ型の接続管（放水用の鋼製管）２ａ（２）やＳ型の接続管（取水用の鋼製管）２ｂ（２）を架台３に支持させて位置決め設置し、この接続管２の後端部に取り付けた鞘管（流水路連結管）４にシールドトンネル５を到達させて接続する。 Specifically, as shown in FIGS. 31 and 32, the intake / discharge port structure constructed on the bottom of the water (underwater) is formed by placing a steel sheet pile 1 on the ground G of the bottom G1 from above the water and connecting the bottom pipeline (underwater). Underwater shaft) The construction area of S is divided, and the inner underwater ground G surrounded by the steel sheet pile 1 is excavated and removed to a predetermined depth to construct an underwater shaft. Then, a J-shaped connecting pipe (steel pipe for water discharge) 2a (2) and an S-shaped connecting pipe (steel pipe for water intake) 2b (2) are supported and positioned inside the underwater shaft by the gantry 3. The shield tunnel 5 is made to reach and be connected to the sheath pipe (flow channel connecting pipe) 4 which is installed and attached to the rear end of the connecting pipe 2.

ここで、水底管路接続部Ｓにシールドマシンが到達し、接続管２の後端側にシールドトンネル５を接続した後、シールドマシンは解体して撤去することが必要になる。このとき、シールドマシンの解体撤去作業をダイバーによる水中作業にすると多大な時間と労力が生じるとともに、空中作業に比べ危険を伴う。 Here, after the shield machine reaches the submerged pipe connection portion S and the shield tunnel 5 is connected to the rear end side of the connection pipe 2, it is necessary to disassemble and remove the shield machine. At this time, if the dismantling and removal work of the shield machine is performed underwater by a diver, a great deal of time and labor is required, and it is more dangerous than the aerial work.

これに対し、例えば、Ｊ型（図３１）やＳ型（図３２）の接続管２を架台３で支持しながら位置決め設置した後、接続管２の先端部に蓋６を取り付けて接続管２の内部の水を抜き、接続管２内をドライ環境にする。そして、シールドマシンが水底管路接続部Ｓに到達するとともに接続管２に取り付けた鞘管４とシールドトンネル５を接続し、接続管２の内部のドライ環境下でシールドマシンを解体するとともにシールドトンネル５を通じてシーツ度マシンの解体部材、機器等を順次地上に撤去する手法が提案、実用化されている。 On the other hand, for example, after positioning and installing the J-type (FIG. 31) or S-type (FIG. 32) connection pipe 2 while supporting it with the gantry 3, a lid 6 is attached to the tip of the connection pipe 2 to connect the connection pipe 2. Drain the water inside the connection pipe 2 and make the inside of the connection pipe 2 a dry environment. Then, when the shield machine reaches the underwater pipeline connection portion S, the sheath pipe 4 attached to the connection pipe 2 and the shield tunnel 5 are connected, and the shield machine is disassembled in a dry environment inside the connection pipe 2 and the shield tunnel is used. A method of sequentially removing the dismantling members, equipment, etc. of the sheet degree machine to the ground through 5 has been proposed and put into practical use.

特開２００３−２８６７１４号公報Japanese Unexamined Patent Publication No. 2003-286714

しかしながら、接続管２の端部に蓋６を取り付け、その後管内の水を排水してドライ作業とする手法においては、鋼製蓋６が接続管２の先端部に設置されている（シールドマシン側に鋼製蓋６を設置すると取外しが困難となる）ため、接続管２内の水を排水するとともに、必然的に接続管２に外部水圧が作用する。これにより、本来、取放水路として設計すべき接続管２を外部水圧に耐える構造にする必要が生じ、要求される強度やコストに対して過大になるという不都合があった。 However, in the method of attaching the lid 6 to the end of the connecting pipe 2 and then draining the water in the pipe for dry work, the steel lid 6 is installed at the tip of the connecting pipe 2 (shield machine side). If the steel lid 6 is installed on the connecting pipe 6, it becomes difficult to remove it), so that the water in the connecting pipe 2 is drained and an external water pressure inevitably acts on the connecting pipe 2. As a result, it becomes necessary for the connecting pipe 2 originally designed as an intake / discharge channel to have a structure that can withstand external water pressure, which has the disadvantage of being excessive with respect to the required strength and cost.

また、横方向に大きく延出するＪ型やＳ型の接続管２を用いることで、且つこれらの接続管２を支持する架台３によって、土留め壁１で取り囲む水底管路接続部Ｓの領域が大きくなり、すなわち、大規模な水中立坑が必要になり、これが工期の長期化、施工コストの増大を招く一要因となっていた。 Further, the area of the submersible pipeline connection portion S surrounded by the earth retaining wall 1 by using the J-type or S-type connection pipes 2 that extend greatly in the lateral direction and by the gantry 3 that supports these connection pipes 2. In other words, a large-scale underwater shaft was required, which was one of the factors leading to a longer construction period and an increase in construction cost.

本発明は、上記事情に鑑み、従来と比較し、施工性、経済性に優れた取放水口構造の施工方法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 a method of constructing an intake / discharge port structure which is superior in workability and economy as compared with the conventional one.

上記の目的を達するために、この発明は以下の手段を提供している。 To achieve the above object, the present invention provides the following means.

本発明の取放水口構造の施工方法は、水底から所定深度の地盤中に土留め壁を設置する土留め壁設置工程と、前記土留め壁で囲まれた内部地盤を掘削する水底地盤掘削工程と、上下方向に軸線方向を向けて配設される縦管、及び前記縦管を貫通するように且つ前記縦管と互いの軸線が交差するようにして前記縦管に一体に配設された流水路連結管からなる接続管を、前記水底地盤掘削工程で形成された前記土留め壁内の水底管路接続部の所定位置に設置する接続管設置工程とを備え、前記水底管路接続部の所定位置に設置した前記接続管の前記流水路連結管の内側端部と外側端部にそれぞれ蓋体を取り付けて前記流水路連結管の内部を密閉する蓋体取付工程と、前記蓋体で密閉した前記流水路連結管の内部の水を抜きつつ前記流水路連結管の内部に充填材を充填する流水路連結管内充填工程と、前記流水路連結管の内部に前記充填材を充填した後、前記外側端部に取り付けた蓋体を撤去する蓋体撤去工程と、前記流水路連結管の外側端部に取水路あるいは放水路となる流水路を接続するとともに、少なくとも一部の前記充填材を除去して前記流水路連結管の内部と前記流水路の内部を連通させる流水路構築工程と、前記流水路及び前記流水路連結管の内部に注水するとともに前記流水路連結管の内側端部に取り付けた蓋体を撤去する流水路連通工程とを備えることを特徴とする。 The construction method of the intake / discharge port structure of the present invention includes a retaining wall installation step of installing a retaining wall in the ground at a predetermined depth from the water bottom and a submerged ground excavation step of excavating the internal ground surrounded by the retaining wall. And the vertical pipes arranged so as to face the axial direction in the vertical direction, and the vertical pipes are integrally arranged so as to penetrate the vertical pipes and intersect the vertical pipes with each other. a connection tube made flowing water channel connection pipe, and a connection pipe installation step of installing a predetermined position of the underwater pipeline connecting portion of the sea bed soil excavation process the soil retaining wall formed in the bottom of the water pipe connecting portion A lid attachment step of attaching lids to the inner and outer ends of the flow channel connecting pipe of the connecting pipe installed at a predetermined position to seal the inside of the flowing channel connecting pipe, and the lid. After filling the inside of the flowing water channel connecting pipe with a filling material while draining water from the inside of the closed flowing water channel connecting pipe, and filling the inside of the flowing water channel connecting pipe with the filling material. , The lid removing step of removing the lid attached to the outer end, and the water passage serving as an intake channel or a drainage channel are connected to the outer end of the flow channel connecting pipe, and at least a part of the filler is used. A flow channel construction step of communicating the inside of the flow channel connecting pipe with the inside of the flow channel, and water is injected into the flow channel and the inside of the flow channel connection pipe and the inner end of the flow channel connection pipe. It is characterized in that it is provided with a flow channel communication process for removing the lid attached to the pipe.

さらに、本発明の取放水口構造の施工方法において、前記流水路構築工程では、シールドマシンを用いて水底地盤に流水路を構築するとともに、前記シールドマシンで前記流水路連結管の外側端部の開口から前記流水路連結管内の充填材を掘削して前記流水路連結管の内部と前記流水路の内部を連通させ、前記流水路を通じ、前記シールドマシンをドライ環境で解体撤去することがより望ましい。 Further, in the construction method of the intake / discharge port structure of the present invention, in the flow channel construction step, a flow channel is constructed on the bottom ground by using a shield machine, and the shield machine is used to construct the outer end of the flow channel connecting pipe. It is more desirable to excavate the filler in the flow channel connecting pipe from the opening to communicate the inside of the flowing channel connecting pipe with the inside of the flowing channel, and to dismantle and remove the shield machine in a dry environment through the flowing channel. ..

また、本発明の取放水口構造の施工方法においては、前記水底地盤掘削工程で形成された前記土留め壁内の水底管路接続部にガイド部材を上下方向に立設するガイド部材設置工程を備え、前記接続管設置工程では、前記ガイド部材に案内させつつ前記水底管路接続部の所定位置に前記接続管を設置することが望ましい。 Further, in the construction method of the water intake / discharge port structure of the present invention, a guide member installation step of erection of a guide member in the vertical direction at the bottom pipe connection portion in the earth retaining wall formed in the bottom ground excavation step is performed. In addition, in the connection pipe installation step, it is desirable to install the connection pipe at a predetermined position of the bottom pipe connection portion while guiding the guide member.

さらに、本発明の取放水口構造の施工方法においては、前記ガイド部材と前記接続管の縦管を固定部で一体に固定し、前記固定部よりも上方の前記ガイド部材を切断撤去し、前記ガイド部材の残部を支持杭とすることがより望ましい。 Further, in the construction method of the water intake / discharge port structure of the present invention, the guide member and the vertical pipe of the connecting pipe are integrally fixed by a fixing portion, and the guide member above the fixing portion is cut and removed. the remainder of the guide member is more preferable that the supporting piles.

また、本発明の取放水口構造の施工方法においては、前記ガイド部材で案内させつつ架台を前記水底管路接続部の所定位置に設置する架台設置工程を備え、前記接続管設置工程では、前記ガイド部材に案内させつつ前記架台上に前記接続管を設置することがさらに望ましい。 Further, the construction method of the water intake / discharge port structure of the present invention includes a pedestal installation step of installing the gantry at a predetermined position of the bottom pipe connection portion while being guided by the guide member, and in the connection pipe installation step, the above-mentioned It is more desirable to install the connecting pipe on the gantry while guiding the guide member.

本発明の取放水口構造の施工方法によれば、従来と比較し、施工性、経済性、安全性に優れた取放水口構造を実現、提供することが可能になる。
According to the construction method of the intake / discharge port structure of the present invention, it is possible to realize and provide an intake / discharge port structure having excellent workability, economy, and safety as compared with the conventional one.

本発明の第１実施形態に係る取放水口構造（取水口構造）を示す断面図である。It is sectional drawing which shows the intake and discharge port structure (intake port structure) which concerns on 1st Embodiment of this invention. 本発明の第１実施形態に係る取放水口構造（取水口構造）の接続管を示す正面図である。It is a front view which shows the connection pipe of the intake / discharge port structure (intake port structure) which concerns on 1st Embodiment of this invention. 図２のＸ１−Ｘ１線矢視図である。It is the X1-X1 line arrow view of FIG. 本発明の第１、第２実施形態に係る取放水口構造（取水口構造／放水口構造）の施工方法において、鋼矢板を水底地盤に打設した状態を示す断面図である。It is sectional drawing which shows the state which the steel sheet pile was placed in the bottom ground in the construction method of the intake / discharge port structure (intake port structure / water discharge port structure) which concerns on 1st and 2nd Embodiment of this invention. 本発明の第１、第２実施形態に係る取放水口構造（取水口構造／放水口構造）の施工方法において、鋼矢板の内側の水底地盤を掘削した状態を示す断面図である。It is sectional drawing which shows the state which excavated the underwater ground inside the steel sheet pile in the construction method of the intake / discharge port structure (intake port structure / water outlet structure) which concerns on 1st and 2nd Embodiment of this invention. 本発明の第１、第２実施形態に係る取放水口構造（取水口構造／放水口構造）の施工方法において、ガイド杭を打ち込むとともにガイド杭にブラケットを水中溶接等で取り付けた状態を示す断面図である。In the construction method of the intake / discharge port structure (intake port structure / water discharge port structure) according to the first and second embodiments of the present invention, a cross section showing a state in which a guide pile is driven and a bracket is attached to the guide pile by underwater welding or the like. It is a figure. 本発明の第１、第２実施形態に係る取放水口構造（取水口構造／放水口構造）の施工方法において、架台を設置した状態を示す断面図である。It is sectional drawing which shows the state which installed the gantry in the construction method of the intake / discharge port structure (intake port structure / water discharge port structure) which concerns on 1st and 2nd Embodiment of this invention. 本発明の第１、第２実施形態に係る取放水口構造（取水口構造／放水口構造）の架台を示す平面図である。It is a top view which shows the frame of the intake / discharge port structure (intake port structure / water outlet structure) which concerns on 1st and 2nd Embodiment of this invention. 本発明の第１、第２実施形態に係る取放水口構造（取水口構造／放水口構造）の施工方法において、１次コンクリートを打設するとともにガイド鋼管の中にグラウトを充填した状態を示す断面図である。In the construction method of the intake / discharge port structure (intake port structure / water discharge port structure) according to the first and second embodiments of the present invention, a state in which primary concrete is cast and grout is filled in the guide steel pipe is shown. It is a sectional view. 本発明の第１実施形態に係る取放水口構造（取水口構造）の施工方法において、接続管を設置した状態を示す断面図である。It is sectional drawing which shows the state which installed the connection pipe in the construction method of the intake / discharge port structure (intake port structure) which concerns on 1st Embodiment of this invention. 本発明の第１実施形態に係る取放水口構造（取水口構造）の施工方法において、２次コンクリートを打設するとともに接続管の流水路連結管に蓋体を取り付けた状態を示す断面図である。In the construction method of the intake / discharge port structure (intake port structure) according to the first embodiment of the present invention, it is a cross-sectional view showing a state in which secondary concrete is placed and a lid is attached to the flow channel connecting pipe of the connecting pipe. is there. 本発明の第１実施形態に係る取放水口構造（取水口構造）の施工方法において、流水路連結管の内部にモルタルを充填した状態を示す断面図である。It is sectional drawing which shows the state which filled the inside of the flow channel connecting pipe with mortar in the construction method of the intake / discharge port structure (intake port structure) which concerns on 1st Embodiment of this invention. 本発明の第１実施形態に係る取放水口構造（取水口構造）の施工方法において、流水路連結管の外側端部の蓋体を撤去するとともに３次コンクリートを打設した状態を示す断面図である。In the construction method of the intake / discharge port structure (intake port structure) according to the first embodiment of the present invention, a cross-sectional view showing a state in which the lid at the outer end of the water flow channel connecting pipe is removed and the tertiary concrete is placed. Is. 本発明の第１実施形態に係る取放水口構造（取水口構造）の施工方法において、砕石を敷設した状態を示す断面図である。It is sectional drawing which shows the state which crushed stone was laid in the construction method of the intake / discharge port structure (intake port structure) which concerns on 1st Embodiment of this invention. 本発明の第１実施形態に係る取放水口構造（取水口構造）の施工方法において、鋼矢板を撤去するとともに砕石を敷設した状態を示す断面図である。It is sectional drawing which shows the state which the steel sheet pile was removed and crushed stone was laid in the construction method of the intake / discharge port structure (intake port structure) which concerns on 1st Embodiment of this invention. 本発明の第１実施形態に係る取放水口構造（取水口構造）の施工方法において、流水路連結管の内部にシールドマシンが到達した状態を示す断面図である。It is sectional drawing which shows the state which the shield machine reached the inside of the flow channel connecting pipe in the construction method of the intake / discharge port structure (intake port structure) which concerns on 1st Embodiment of this invention. 本発明の第１実施形態に係る取放水口構造（取水口構造）の施工方法において、止水処理を施した状態を示す断面図である。It is sectional drawing which shows the state which performed the water stop treatment in the construction method of the intake / discharge port structure (intake port structure) which concerns on 1st Embodiment of this invention. 本発明の第１実施形態に係る取放水口構造（取水口構造）の施工方法において、取水路に水を注水するとともに流水路連結管の内側端部の蓋体を撤去した状態を示す断面図である。In the construction method of the intake / discharge port structure (intake port structure) according to the first embodiment of the present invention, a cross-sectional view showing a state in which water is injected into the intake channel and the lid at the inner end of the flow channel connecting pipe is removed. Is. 本発明の第２実施形態に係る取放水口構造（放水口構造）を示す断面図である。It is sectional drawing which shows the intake / discharge port structure (water discharge port structure) which concerns on 2nd Embodiment of this invention. 本発明の第２実施形態に係る取放水口構造（放水口構造）の接続管を示す正面図である。It is a front view which shows the connection pipe of the intake / discharge port structure (water discharge port structure) which concerns on 2nd Embodiment of this invention. 図２０のＸ１−Ｘ１線矢視図である。It is the X1-X1 line arrow view of FIG. 本発明の第２実施形態に係る取放水口構造（放水口構造）の施工方法において、接続管を設置した状態を示す断面図である。It is sectional drawing which shows the state which installed the connection pipe in the construction method of the intake / discharge port structure (water discharge port structure) which concerns on 2nd Embodiment of this invention. 本発明の第２実施形態に係る取放水口構造（放水口構造）の施工方法において、２次コンクリートを打設するとともに接続管の流水路連結管に蓋体を取り付けた状態を示す断面図である。In the construction method of the intake / discharge port structure (water discharge port structure) according to the second embodiment of the present invention, it is a cross-sectional view showing a state in which secondary concrete is placed and a lid is attached to the flow channel connecting pipe of the connecting pipe. is there. 本発明の第２実施形態に係る取放水口構造（放水口構造）の施工方法において、流水路連結管の内部にモルタルを充填した状態を示す断面図である。It is sectional drawing which shows the state which filled the inside of the flow channel connecting pipe with mortar in the construction method of the intake / discharge port structure (water discharge port structure) which concerns on 2nd Embodiment of this invention. 本発明の第２実施形態に係る取放水口構造（放水口構造）の施工方法において、流水路連結管の外側端部の蓋体を撤去するとともに３次コンクリートを打設した状態を示す断面図である。In the construction method of the intake / discharge port structure (water discharge port structure) according to the second embodiment of the present invention, a cross-sectional view showing a state in which the lid at the outer end of the flow channel connecting pipe is removed and the tertiary concrete is placed. Is. 本発明の第２実施形態に係る取放水口構造（放水口構造）の施工方法において、放水管を敷設する部分の水底地盤を開削した状態を示す断面図である。It is sectional drawing which shows the state which excavated the bottom ground of the part where the water discharge pipe is laid in the construction method of the water intake / discharge port structure (water discharge port structure) which concerns on 2nd Embodiment of this invention. 本発明の第２実施形態に係る取放水口構造（放水口構造）の施工方法において、放水管敷設部周辺の鋼矢板を撤去するとともに放水管を敷設した状態を示す断面図である。FIG. 5 is a cross-sectional view showing a state in which a steel sheet pile around a water discharge pipe laying portion is removed and a water discharge pipe is laid in the construction method of the water intake / discharge port structure (water discharge port structure) according to the second embodiment of the present invention. 本発明の第２実施形態に係る取放水口構造（放水口構造）の施工方法において、砕石を敷設した状態を示す断面図である。It is sectional drawing which shows the state which crushed stone was laid in the construction method of the intake / discharge port structure (water discharge port structure) which concerns on 2nd Embodiment of this invention. 本発明の第２実施形態に係る取放水口構造（放水口構造）の施工方法において、鋼矢板を撤去するとともに流水路連結管の内部にシールドマシンが到達した状態を示す断面図である。FIG. 5 is a cross-sectional view showing a state in which a steel sheet pile is removed and a shield machine reaches the inside of a flow channel connecting pipe in a construction method of an intake / discharge port structure (water discharge port structure) according to a second embodiment of the present invention. 本発明の第２実施形態に係る取放水口構造（放水口構造）の施工方法において、止水処理を施した状態を示す断面図である。It is sectional drawing which shows the state which performed the water stop treatment in the construction method of the water intake / discharge port structure (water discharge port structure) which concerns on 2nd Embodiment of this invention. 従来の取放水口構造（取水口構造）を示す図である。It is a figure which shows the conventional intake / discharge port structure (intake port structure). 従来の取放水口構造（放水口構造）を示す図である。It is a figure which shows the conventional water intake / discharge port structure (water discharge port structure).

以下、図１から図１８を参照し、本発明の第１実施形態に係る取放水口構造及び取放水口構造の施工方法について説明する。ここで、本実施形態は、例えば発電施設などの冷却用の水を取水するための取水設備の取水口構造に関するものである。 Hereinafter, the construction method of the intake / discharge port structure and the intake / discharge port structure according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 18. Here, the present embodiment relates to an intake structure of an intake facility for taking in cooling water of, for example, a power generation facility.

本実施形態の取放水口構造／取水口構造Ａは、図１に示すように、水底Ｇ１の地盤Ｇ中に埋設される接続管１０と、シールドマシンで推進掘削し、接続管１０に接続させて構築されたシールドトンネル５からなる取水路／流水路と、水中に配された接続管１０の一端に取り付けられた取水口１１とを備えて構成されている。 As shown in FIG. 1, the intake / discharge port structure / intake port structure A of the present embodiment is propulsively excavated with a connection pipe 10 buried in the ground G of the bottom G1 and connected to the connection pipe 10. It is configured to include an intake channel / running channel composed of a shield tunnel 5 constructed in the above manner and an intake port 11 attached to one end of a connecting pipe 10 arranged in water.

接続管１０は、図１から図３に示すように、上下方向に軸線Ｏ１方向を向けて配設される縦管１２と、縦管１２を貫通するように水平方向に軸線Ｏ２方向を向けて配設される流水路連結管（シールド到達部鞘管）１３と、縦管１２の下端に一体に取り付けられた縦管補強材１４と、接続管１０の設置時に使用する縦管ガイド枠１５とを備えて形成されている。 As shown in FIGS. 1 to 3, the connecting pipe 10 has a vertical pipe 12 arranged so as to face the axis O1 direction in the vertical direction and a vertical pipe 12 having the axis O2 direction so as to penetrate the vertical pipe 12. A flow channel connecting pipe (shield reaching portion sheath pipe) 13 to be arranged, a vertical pipe reinforcing material 14 integrally attached to the lower end of the vertical pipe 12, and a vertical pipe guide frame 15 used when installing the connecting pipe 10. Is formed with.

本実施形態の取放水口構造／取水口構造Ａを施工する際には、図４に示すように、まず、水底Ｇ１から所定の深度まで鋼矢板を打ち込み、所定領域の地盤Ｇを囲繞する土留め壁１を設置する（土留め壁設置工程）。 When constructing the intake / discharge port structure / intake port structure A of the present embodiment, as shown in FIG. 4, first, a steel sheet pile is driven from the bottom G1 to a predetermined depth, and the soil surrounding the ground G in a predetermined area is formed. Install the retaining wall 1 (earth retaining wall installation process).

次に、図５に示すように、土留め壁１で周囲の地盤Ｇを支持しつつ、土留め壁１で囲まれた内部地盤Ｇを所定深度まで水中で掘削除去する（水底地盤掘削工程）。 Next, as shown in FIG. 5, while the surrounding ground G is supported by the retaining wall 1, the internal ground G surrounded by the retaining wall 1 is excavated and removed in water to a predetermined depth (underwater ground excavation step). ..

次に、図６に示すように、土留め壁１内の水底管路接続部Ｓにガイド杭１６を打ち込む（ガイド杭設置工程）。本実施形態では、ガイド杭１６としてＨ形鋼を用い、軸線方向を上下方向に向け、土留め壁１内の地盤Ｇに下端側を打ち込んで設置する。また、ガイド杭１６は、その上端側が水面Ｗ１よりも上方に配される長さで形成されるとともに、後工程で設置する架台１８を支持するためのブラケット１７を下端側の所定位置に水中溶接等で一体に取り付けて形成されている。さらに、本実施形態では３本のガイド杭１６を設置する。 Next, as shown in FIG. 6, the guide pile 16 is driven into the submerged pipe connection portion S in the earth retaining wall 1 (guide pile installation step). In the present embodiment, H-shaped steel is used as the guide pile 16, the axial direction is directed in the vertical direction, and the lower end side is driven into the ground G in the earth retaining wall 1 for installation. Further, the guide pile 16 is formed with a length such that the upper end side thereof is arranged above the water surface W1, and the bracket 17 for supporting the gantry 18 installed in the subsequent process is underwater welded at a predetermined position on the lower end side. It is formed by being integrally attached with or the like. Further, in the present embodiment, three guide piles 16 are installed.

次に、図７に示すように、３本のガイド部材１６にそれぞれ取り付けられた３つのブラケットに支持させつつ溶接などで固着して鋼製の架台１８を位置決め設置する（架台設置工程）。 Next, as shown in FIG. 7, the steel pedestal 18 is positioned and installed while being supported by the three brackets attached to the three guide members 16 and fixed by welding or the like (frame installation process).

ここで、本実施形態の架台１８は、図８に示すように、Ｈ形鋼などの鋼材１８ａを平面視略三角形状を呈するように組み付けるとともに、平面視略三角形状の３つの角部にそれぞれ、軸線方向を上下方向に向けてガイド鋼管１８ｂを溶接などで一体に固着して形成されている。そして、架台１８は、図７及び図８に示すように、各ガイド鋼管１８ｂにガイド部材１６を挿通し、３本のガイド部材１６と３つのガイド鋼管１８ｂで上下方向に案内しながらブラケット１７に支持される所定位置に設置される。 Here, as shown in FIG. 8, the gantry 18 of the present embodiment is assembled with steel materials 18a such as H-shaped steel so as to exhibit a substantially triangular shape in a plan view, and is attached to each of the three corners having a substantially triangular shape in a plan view. , The guide steel pipe 18b is integrally fixed by welding or the like with the axial direction directed in the vertical direction. Then, as shown in FIGS. 7 and 8, the gantry 18 inserts the guide member 16 into each guide steel pipe 18b, and guides the pedestal 18 to the bracket 17 in the vertical direction by the three guide members 16 and the three guide steel pipes 18b. It is installed in a predetermined position to be supported.

次に、図９に示すように、ブラケット１７を埋設し、架台１８の上面を露出させるようにして、土留め壁１内の底部側に根固め用の１次コンクリート１９を打設する（１次コンクリート打設工程）。これとともに、本実施形態では架台１８のガイド鋼管１８ｂの内部にモルタルを充填し、架台１８とガイド部材１６を一体化する（架台／ガイド部材固着工程）。 Next, as shown in FIG. 9, the bracket 17 is embedded so that the upper surface of the gantry 18 is exposed, and the primary concrete 19 for rooting is placed on the bottom side in the retaining wall 1 (1). Next concrete placing process). At the same time, in the present embodiment, the inside of the guide steel pipe 18b of the gantry 18 is filled with mortar, and the gantry 18 and the guide member 16 are integrated (the gantry / guide member fixing step).

次に、図１０（図２、図３参照）に示すように、接続管１０を設置する（接続管設置工程）。このとき、３つの縦管ガイド枠１５にそれぞれガイド部材１６を挿通し、縦管１２の軸線Ｏ１方向が上下方向に沿うように、３本のガイド部材１６で案内させながら水上から下方の水中に接続管１０を沈設してゆき、架台１８上に載置するようにして所定位置に設置する（接続管設置工程）。 Next, as shown in FIG. 10 (see FIGS. 2 and 3), the connection pipe 10 is installed (connection pipe installation step). At this time, the guide member 16 is inserted into each of the three vertical pipe guide frames 15, and the three guide members 16 guide the vertical pipe 12 into the water below the water so that the axis O1 direction of the vertical pipe 12 is along the vertical direction. The connection pipe 10 is sunk and installed at a predetermined position so as to be placed on the gantry 18 (connection pipe installation step).

このようにガイド杭１６と縦管ガイド枠１５を用いて上下方向に案内しながら設置することにより、接続管１０を容易に位置決め設置することができる。また、本実施形態では、事前にガイド杭１６の出来形測量を実施しておき、その測量結果を基にして縦管ガイド枠１５の中に配備されている位置調整治具２０を微調整して、縦管１２を架台１８上の所定位置に配置する。縦管１２と架台１８、ガイド杭１６を溶接するなどして一体に固定する（接続管固定工程）。これにより、精度よく接続管１０を位置決め設置することができる。 By using the guide pile 16 and the vertical pipe guide frame 15 to guide the pipe in the vertical direction in this way, the connecting pipe 10 can be easily positioned and installed. Further, in the present embodiment, the finished shape survey of the guide pile 16 is performed in advance, and the position adjusting jig 20 provided in the vertical pipe guide frame 15 is finely adjusted based on the survey result. The vertical pipe 12 is arranged at a predetermined position on the gantry 18. The vertical pipe 12, the gantry 18, and the guide pile 16 are integrally fixed by welding or the like (connecting pipe fixing step). As a result, the connection pipe 10 can be positioned and installed with high accuracy.

次に、図１１に示すように、縦管１２とガイド部材１６を固定した固定部よりも上方（本実施形態では位置調整枠２０よりも上方）のガイド部材１６を切断して撤去する（ガイド部材切断撤去工程）。位置調整枠２０や架台１８を埋設するように、１次コンクリート１９上に２次コンクリート２１を打設する（２次コンクリート打設工程）。これにより、１次コンクリート１９、２次コンクリート２１、地盤Ｇにガイド部材１６の残部が埋設され、このガイド部材１６の残部が支持杭として機能することになる。 Next, as shown in FIG. 11, the guide member 16 above the fixed portion where the vertical pipe 12 and the guide member 16 are fixed (above the position adjusting frame 20 in this embodiment) is cut and removed (guide). Member cutting and removal process). The secondary concrete 21 is placed on the primary concrete 19 so as to bury the position adjusting frame 20 and the gantry 18 (secondary concrete placing process). As a result, the remaining portion of the guide member 16 is embedded in the primary concrete 19, the secondary concrete 21, and the ground G, and the remaining portion of the guide member 16 functions as a support pile.

これとともに、接続管１０の流水路連結管１３の内側端部１３ａと外側端部１３ｂにそれぞれ鋼製の蓋体２２を取り付け、流水路連結管１３の内部を密閉する（蓋体取付工程）。本実施形態では、流水路連結管１３の両端部にフランジが設けられ、各蓋体２２を流水路連結管１３の外側からフランジにボルト接合して取り付ける。また、流水路連結管１３の内側端部１３ａには、外側端部１３ｂに取り付ける蓋体２２よりも高耐力の蓋体２２を取り付けるようにする。 At the same time, steel lids 22 are attached to the inner end 13a and the outer end 13b of the flow channel connecting pipe 13 of the connecting pipe 10, respectively, and the inside of the flowing channel connecting pipe 13 is sealed (lid attachment step). In the present embodiment, flanges are provided at both ends of the water flow channel connecting pipe 13, and each lid 22 is attached by bolting to the flange from the outside of the water flow channel connecting pipe 13. Further, a lid 22 having a higher yield strength than the lid 22 attached to the outer end 13b is attached to the inner end 13a of the water flow channel connecting pipe 13.

次に、図１２に示すように、蓋体２２で密閉した流水路連結管１３の内部の水Ｗを抜きつつモルタル２３を注入し、流水路連結管１３の内部にモルタル（充填材）２３を充填する（流水路連結管内充填工程）。 Next, as shown in FIG. 12, the mortar 23 is injected while draining the water W inside the flow channel connecting pipe 13 sealed by the lid 22, and the mortar (filler) 23 is placed inside the flowing channel connecting pipe 13. Filling (filling process in the running water channel connecting pipe).

流水路連結管１３の内部のモルタル２３が硬化し所定の強度を発現した段階で、図１３に示すように、外側端部１３ｂに取り付けた蓋体２２を撤去し（蓋体撤去工程）、流水路連結管１３が埋設されるように、縦管１２と土留め壁１の間に３次コンクリート２４を打設する（３次コンクリート打設工程）。 When the mortar 23 inside the water flow channel connecting pipe 13 is hardened and develops a predetermined strength, as shown in FIG. 13, the lid 22 attached to the outer end 13b is removed (lid removal step), and running water The tertiary concrete 24 is placed between the vertical pipe 12 and the retaining wall 1 so that the road connecting pipe 13 is buried (tertiary concrete placing step).

次に、図１４、図１５に示すように、３次コンクリート２４の上方の縦管１２と土留め壁１の間に捨石（砕石）２５を充填する（砕石充填／敷設工程）。さらに、土留め壁１を形成する鋼矢板を引き抜いて撤去するとともに（土留め壁撤去工程）、縦管１２の周囲及び水底Ｇ１上に捨石２５を投入して敷き均す（砕石充填／敷設工程）。 Next, as shown in FIGS. 14 and 15, crushed stone (crushed stone) 25 is filled between the vertical pipe 12 above the tertiary concrete 24 and the earth retaining wall 1 (crushed stone filling / laying step). Further, the steel sheet pile forming the earth retaining wall 1 is pulled out and removed (earth retaining wall removing step), and rubble stone 25 is thrown around the vertical pipe 12 and on the water bottom G1 and spread evenly (crushed stone filling / laying step). ).

ここで、本実施形態では、図１６に示すように、シールドマシン３０を用い、セグメント３１を組み付けつつシールドマシン３０を推進させ、水底地盤Ｇに取水路（シールドトンネル）５を構築する（流水路構築工程）。そして、シールド到達部の流水路連結管１３にシールドマシン３０を到達させる。このとき、シールドマシン３０で縦管１２の周囲の地盤Ｇから３次コンクリート２４、さらに流水路連結管１３の外側端部１３ｂの開口を通じて流水路連結管１３内のモルタル２３を掘削し、内側端部１３ａの蓋体２２直近までシールドマシン３０を推進させる。本実施形態では、流水路連結管１３内をコンクリートではなくモルタル２３で充填することにより、シールドマシン３０の掘進時（充填材の除去時）のビットの消耗／損傷を抑えることができる。 Here, in the present embodiment, as shown in FIG. 16, the shield machine 30 is used, the shield machine 30 is propelled while assembling the segment 31, and the intake channel (shield tunnel) 5 is constructed in the bottom ground G (flow channel). Construction process). Then, the shield machine 30 is brought to reach the flow channel connecting pipe 13 of the shield reaching portion. At this time, the shield machine 30 excavates the tertiary concrete 24 from the ground G around the vertical pipe 12 and the mortar 23 in the water flow channel connecting pipe 13 through the opening of the outer end portion 13b of the flowing water channel connecting pipe 13, and the inner end. The shield machine 30 is propelled to the immediate vicinity of the lid 22 of the portion 13a. In the present embodiment, by filling the inside of the water flow channel connecting pipe 13 with mortar 23 instead of concrete, it is possible to suppress wear / damage of the bit at the time of digging (when removing the filler) of the shield machine 30.

流水路連結管１３の内側端部１３ａに取り付けた蓋体２２の直近までシールドマシン３０が到達した段階で、シールドマシン３０の外殻の周囲、外殻と流水路連結管１３の境界部分（接合部）に止水モルタル／止水グラウト３２を充填するなどし、この部分の止水処理を施す（止水処理工程）。なお、止水処理の手法は特に限定する必要はない。 When the shield machine 30 reaches the immediate vicinity of the lid 22 attached to the inner end 13a of the water flow channel connecting pipe 13, the periphery of the outer shell of the shield machine 30 and the boundary portion (joining) between the outer shell and the flowing water channel connecting pipe 13. Part) is filled with water-stopping mortar / water-stopping grout 32 to perform water-stopping treatment on this part (water-stopping treatment step). The method of water stop treatment does not need to be particularly limited.

次に、図１７に示すように、シールドマシン３０の外殻を残し、シールドマシン３０の他の装置、部材、機器等を解体するとともにシールドトンネル５を通じて外部に搬出して除去する（シールドマシン解体撤去工程）。これにより、シールドマシン３０の解体撤去をシールドトンネル５の取水路内のドライ環境で行うことができる。 Next, as shown in FIG. 17, the outer shell of the shield machine 30 is left, and other devices, members, devices, etc. of the shield machine 30 are disassembled and carried out through the shield tunnel 5 to be removed (disassembly of the shield machine). Removal process). As a result, the shield machine 30 can be disassembled and removed in a dry environment in the intake channel of the shield tunnel 5.

次に、図１８に示すように、シールドトンネル５の内部に注水し、流水路連結管１３の内側端部１３ａに取り付けた蓋体２２を撤去する（流水路連通工程）。このとき、流水路連結管１３ひいては取水路（シールドトンネル）５の径よりも縦管１２の径が大きいことにより、取り外した蓋体２２を縦管１２の上部から引き抜いて撤去することができる。 Next, as shown in FIG. 18, water is injected into the shield tunnel 5 and the lid 22 attached to the inner end 13a of the flow channel connecting pipe 13 is removed (flow channel communication step). At this time, since the diameter of the vertical pipe 12 is larger than the diameter of the water flow channel connecting pipe 13 and thus the intake channel (shield tunnel) 5, the removed lid 22 can be pulled out from the upper part of the vertical pipe 12 and removed.

次に、図１に示すように、縦管１２の上端部側に取水口１１を取り付ける（取水口取付工程）。また、必要に応じて障害物侵入防止網３３を、取水口１１を覆うように取り付ける。これにより、本実施形態の取水口構造Ａが完成する。 Next, as shown in FIG. 1, the water intake port 11 is attached to the upper end side of the vertical pipe 12 (water intake port attachment step). Further, if necessary, an obstacle intrusion prevention net 33 is attached so as to cover the water intake port 11. As a result, the intake structure A of the present embodiment is completed.

そして、上記構成からなる本実施形態の取放水口構造（取水口構造）Ａ及び取放水口構造Ａの施工方法においては、従来のＪ型やＳ型の接続管ではなく、軸線Ｏ１が上下方向に延びる縦管１２に、軸線Ｏ１、Ｏ２が交差するように一体に流水路連結管１３を取り付けて接続管１０を構成したことにより、接続管１０の幅（横方向の寸法）を従来よりも小さくすることができる。また、接続管１０を縦管１２と流水路連結管１３で構成し、その幅が小さくなることで、これを支持するための架台１８も小さく簡易な構造とすることができる。 Then, in the construction method of the intake / discharge port structure (intake port structure) A and the intake / discharge port structure A of the present embodiment having the above configuration, the axis O1 is in the vertical direction instead of the conventional J-type or S-type connection pipe. The width (horizontal dimension) of the connecting pipe 10 is made wider than before by integrally attaching the flowing water channel connecting pipe 13 to the vertical pipe 12 extending to the above so that the axes O1 and O2 intersect. It can be made smaller. Further, the connecting pipe 10 is composed of the vertical pipe 12 and the flowing water channel connecting pipe 13, and the width thereof is reduced, so that the gantry 18 for supporting the connecting pipe 10 can be made small and have a simple structure.

これにより、従来と比較し、土留め壁１で囲まれた水底管路接続部Ｓの領域を小さくすることができ、すなわち、水中立坑の規模を小さくすることができ、工期の短期化、低コスト化、安全性の向上を図ることが可能になる。 As a result, the area of the submerged pipe connection portion S surrounded by the retaining wall 1 can be reduced, that is, the scale of the underwater shaft can be reduced, and the construction period can be shortened and reduced as compared with the conventional case. It is possible to reduce costs and improve safety.

また、本実施形態の取放水口構造Ａの施工方法においては、接続管１０の流水路連結管１３の両端部１３ａ、１３ｂに蓋体２２を取り付けて流水路連結管１３の内部を密閉するとともにモルタル２３を充填した後、流水路連結管１３の外側端部１３ｂの蓋体２２を取り外してシールドマシン３０を流水路連結管１３の内部まで掘進／到達させるようにした。これにより、シールドマシン３０で構築した流水路５と流水路連結管１３の内部を連通させることができ、シールドマシン３０をドライ環境で解体し、流水路５を通じて外部に搬出除去することが可能になる。 Further, in the construction method of the intake / discharge port structure A of the present embodiment, the lids 22 are attached to both ends 13a and 13b of the water flow channel connecting pipe 13 of the connecting pipe 10 to seal the inside of the water flow channel connecting pipe 13. After filling the mortar 23, the lid 22 of the outer end 13b of the flow channel connecting pipe 13 was removed so that the shield machine 30 could be dug / reached to the inside of the flowing water channel connecting pipe 13. As a result, the flow channel 5 constructed by the shield machine 30 can communicate with the inside of the flow channel connecting pipe 13, and the shield machine 30 can be disassembled in a dry environment and carried out and removed through the flow channel 5. Become.

すなわち、縦管１２の内部に水が満たされ、縦管１２の内部に突出する流水路連結管１３の内側端部１３ａ側、及び内側端部１３ａに取り付けた蓋体２２で水圧を受けるようにすればよいため、従来のように取放水路として設計すべき接続管１０を大きな外部水圧に耐える構造にする必要がなく、要求される強度やコストに応じた接続管１０を用いて取放水口構造Ａを構築することが可能になる。 That is, the inside of the vertical pipe 12 is filled with water, and the water pressure is received by the inner end 13a side of the flow channel connecting pipe 13 protruding inside the vertical pipe 12 and the lid 22 attached to the inner end 13a. Therefore, it is not necessary to make the connection pipe 10 to be designed as an intake / discharge channel into a structure that can withstand a large external water pressure as in the conventional case, and the intake / discharge port is used according to the required strength and cost. It becomes possible to construct the structure A.

したがって、本実施形態の取放水口構造Ａ及び取放水口構造Ａの施工方法によれば、従来と比較し、施工性、経済性、安全性に優れた取放水口構造Ａを実現、提供することが可能になる。 Therefore, according to the construction method of the intake / discharge port structure A and the intake / discharge port structure A of the present embodiment, the intake / discharge port structure A having excellent workability, economy, and safety as compared with the conventional one is realized and provided. Will be possible.

また、本実施形態の取放水口構造Ａの施工方法（及び取放水口構造Ａ）においては、よれば、土留め壁１内の水底管路接続部Ｓにガイド部材１６を建て込んで上下方向に立設し、このガイド部材１６に案内させて、架台１８や接続管１０（縦管１２）を設置することにより、容易に且つ精度よく架台１８、接続管１０を水中の所定位置に位置決め設置することが可能になる。 Further, in the construction method of the intake / discharge port structure A (and the intake / discharge port structure A) of the present embodiment, according to this, the guide member 16 is built in the bottom pipe connection portion S in the retaining wall 1 in the vertical direction. By installing the gantry 18 and the connecting pipe 10 (vertical pipe 12) by guiding the pedestal 18 and the connecting pipe 10 to the guide member 16, the pedestal 18 and the connecting pipe 10 can be easily and accurately positioned and installed at a predetermined position in the water. It becomes possible to do.

さらに、３本のガイド部材１６を設置し、架台１８や接続管１０を３点で支持しながらガイド部材１６で案内して所定位置に設置するようにしたことで、安定した状態を容易に且つ確実に維持しながら架台１８、接続管１０を沈設することができる。 Further, by installing three guide members 16 and supporting the gantry 18 and the connecting pipe 10 at three points and guiding them with the guide members 16 to install them at a predetermined position, a stable state can be easily achieved. The gantry 18 and the connecting pipe 10 can be sunk while being reliably maintained.

また、このように３本のガイド部材１６（複数のガイド部材１６）で案内することにより、Ｈ形鋼などの鋼材１８ａを組み付けるとともにガイド鋼管１８ｂを一体に固着して架台１８を形成し、ガイド鋼管１８ｂにガイド部材１６を挿通し、ガイド部材１６とガイド鋼管１８ｂで上下方向に案内しながら架台１８を所定位置に設置することができる。
同じく、縦管１２に縦管ガイド枠１５を一体に固着して接続管１０を形成し、縦管ガイド枠１５にガイド部材１６を挿通し、ガイド部材１６と縦管ガイド枠１５で上下方向に案内しながら接続管１０を所定位置に設置することができる。
これにより、より容易に台１８、接続管１０を所定位置に沈設することが可能になる。 Further, by guiding with three guide members 16 (a plurality of guide members 16) in this way, a steel material 18a such as H-shaped steel is assembled, and the guide steel pipe 18b is integrally fixed to form a pedestal 18 to form a guide. The guide member 16 can be inserted into the steel pipe 18b, and the gantry 18 can be installed at a predetermined position while being guided in the vertical direction by the guide member 16 and the guide steel pipe 18b.
Similarly, the vertical pipe guide frame 15 is integrally fixed to the vertical pipe 12 to form the connecting pipe 10, the guide member 16 is inserted into the vertical pipe guide frame 15, and the guide member 16 and the vertical pipe guide frame 15 are used in the vertical direction. The connecting pipe 10 can be installed at a predetermined position while guiding.
This makes it possible to more easily lay the base 18 and the connecting pipe 10 at predetermined positions.

さらに、架台１８、接続管１０を位置決め設置した段階で、縦管１２とガイド部材１６を固定した固定部よりも上方のガイド部材１６を切断して撤去することにより、地盤Ｇ（１次コンクリート１９、２次コンクリート２１）にガイド部材１６の残部を埋設した状態で残すことができる。これにより、このガイド部材１６の残部を支持杭として活用することが可能になる。 Further, at the stage where the gantry 18 and the connecting pipe 10 are positioned and installed, the ground G (primary concrete 19) is removed by cutting and removing the guide member 16 above the fixed portion where the vertical pipe 12 and the guide member 16 are fixed. The remaining portion of the guide member 16 can be left embedded in the secondary concrete 21). This makes it possible to utilize the remaining portion of the guide member 16 as a support pile.

また、本実施形態の取放水口構造Ａの施工方法（及び取放水口構造Ａ）においては、流水路連結管１３内をコンクリートではなくモルタル２３で充填することにより、流水路連結管１３内にシールドマシン３０を掘進させる際に、シールドマシン３０の掘進時のビットの消耗／損傷を抑えることができる。 Further, in the construction method of the water intake / discharge port structure A (and the water intake / discharge port structure A) of the present embodiment, the inside of the water flow channel connecting pipe 13 is filled with mortar 23 instead of concrete, so that the inside of the water flow channel connecting pipe 13 is filled. When digging the shield machine 30, it is possible to suppress wear / damage of bits during digging of the shield machine 30.

以下、図４から図９、図１９から図３０を参照し、本発明の第２実施形態に係る取放水口構造及び取放水口構造の施工方法について説明する。ここで、本実施形態は、例えば発電施設などの冷却用の水を放水する放水設備の放水口構造に関するものである。 Hereinafter, the construction method of the intake / discharge port structure and the intake / discharge port structure according to the second embodiment of the present invention will be described with reference to FIGS. 4 to 9 and 19 to 30. Here, the present embodiment relates to an outlet structure of a water discharge facility that discharges cooling water such as a power generation facility.

本実施形態の取放水口構造／放水口構造Ｂは、図１９に示すように、水底Ｇ１の地盤Ｇ中に埋設される接続管４０と、シールドマシンで推進掘削し、接続管４０に接続させて構築されたシールドトンネル５からなる放水路（放水導水路）／流水路と、水底地盤を開削し、接続管４０に接続して設置された放水管（放水口）４１とを備えて構成されている。 As shown in FIG. 19, the intake / discharge port structure / discharge port structure B of the present embodiment is connected to the connection pipe 40 by propulsion excavation with a connection pipe 40 buried in the ground G of the water bottom G1 and a shield machine. It is configured to include a floodway (flooding channel) / running channel composed of a shield tunnel 5 constructed in the above manner, and a drainage pipe (drainage port) 41 installed by excavating the bottom ground and connecting to a connecting pipe 40. ing.

接続管４０は、図１９から図２１に示すように、上下方向に軸線Ｏ１方向を向けて配設される縦管１２と、縦管１２を貫通するように水平方向に軸線Ｏ２方向を向けて配設される流水路連結管（シールド到達部鞘管）１３と、流水路連結管１３よりも上方に配設されるとともに、縦管１２を貫通するように水平方向に軸線Ｏ３方向を向けて配設される放水管連結管４２と、縦管１２の下端に一体に取り付けられた縦管補強材１４と、接続管４０の設置時に使用する縦管ガイド枠１５とを備えて形成されている。 As shown in FIGS. 19 to 21, the connecting pipe 40 has a vertical pipe 12 arranged so as to face the axis O1 direction in the vertical direction and an axis O2 direction in the horizontal direction so as to penetrate the vertical pipe 12. The flow channel connecting pipe (shield reaching portion sheath pipe) 13 to be arranged and the flowing water channel connecting pipe 13 are arranged above the flowing water channel connecting pipe 13, and the axis line O3 is directed in the horizontal direction so as to penetrate the vertical pipe 12. It is formed to include a water discharge pipe connecting pipe 42 to be arranged, a vertical pipe reinforcing material 14 integrally attached to the lower end of the vertical pipe 12, and a vertical pipe guide frame 15 used when installing the connecting pipe 40. ..

本実施形態の取放水口構造／放水口構造Ｂを施工する際には、第１実施形態の取水口構造Ａの施工方法と同様に（図４、図５、図６、図７、図８、図９に示したように）、土留め壁設置工程、水底地盤掘削工程、ガイド部材設置工程、架台設置工程、１次コンクリート打設工程、架台／ガイド部材固着工程を順次行ってゆく。 When constructing the intake / discharge port structure / outlet structure B of the present embodiment, the same as the construction method of the intake port structure A of the first embodiment (FIGS. 4, 5, 6, 7, 7, 8). , As shown in FIG. 9), the earth retaining wall installation process, the underwater ground excavation process, the guide member installation process, the gantry installation process, the primary concrete placing process, and the gantry / guide member fixing process are sequentially performed.

そして、図２２（図２０、図２１参照）に示すように、接続管４０を設置する（接続管設置工程）。第１実施形態と同様、３つの縦管ガイド枠１５にそれぞれガイド部材１６を挿通し、縦管１２の軸線Ｏ１方向が上下方向に沿うように、３本のガイド部材１６で案内させながら水上から下方の水中に接続管４０を沈設してゆき、架台１８上に載置するようにして所定位置に設置する。 Then, as shown in FIG. 22 (see FIGS. 20 and 21), the connection pipe 40 is installed (connection pipe installation step). Similar to the first embodiment, the guide members 16 are inserted into the three vertical pipe guide frames 15, respectively, and the three guide members 16 guide the vertical pipe 12 so that the axis O1 direction is along the vertical direction from the water. The connecting pipe 40 is submerged in the water below and placed at a predetermined position so as to be placed on the gantry 18.

このようにガイド杭１６と縦管ガイド枠１５を用いて上下方向に案内しながら設置することにより、接続管４０を容易に位置決め設置することができる。また、本実施形態では、事前にガイド杭１６の出来形測量を実施しておき、その測量結果を基にして縦管ガイド枠１５の中に配備されている位置調整治具２０を微調整して、縦管１２を架台１８上の所定位置に配置する。縦管１２と架台１８、ガイド杭１６を溶接するなどして一体に固定する（接続管固定工程）。これにより、精度よく接続管１０を位置決め設置することができる。 By using the guide pile 16 and the vertical pipe guide frame 15 to guide the pipes in the vertical direction in this way, the connecting pipe 40 can be easily positioned and installed. Further, in the present embodiment, the finished shape survey of the guide pile 16 is performed in advance, and the position adjusting jig 20 provided in the vertical pipe guide frame 15 is finely adjusted based on the survey result. The vertical pipe 12 is arranged at a predetermined position on the gantry 18. The vertical pipe 12, the gantry 18, and the guide pile 16 are integrally fixed by welding or the like (connecting pipe fixing step). As a result, the connection pipe 10 can be positioned and installed with high accuracy.

次に、図２３に示すように、縦管１２とガイド部材１６を固定した固定部よりも上方（本実施形態では位置調整枠２０よりも上方）のガイド部材１６を切断して撤去する（ガイド部材切断撤去工程）。そして、第１実施形態と同様、位置調整枠２０や架台１８を埋設するように、１次コンクリート１９上に２次コンクリート２１を打設する（２次コンクリート打設工程）。これにより、１次コンクリート１９、２次コンクリート２１、地盤Ｇにガイド部材１６の残部が埋設され、このガイド部材１６の残部が支持杭として機能することになる。 Next, as shown in FIG. 23, the guide member 16 above the fixed portion where the vertical pipe 12 and the guide member 16 are fixed (above the position adjusting frame 20 in this embodiment) is cut and removed (guide). Member cutting and removal process). Then, as in the first embodiment, the secondary concrete 21 is placed on the primary concrete 19 so as to bury the position adjusting frame 20 and the gantry 18 (secondary concrete placing step). As a result, the remaining portion of the guide member 16 is embedded in the primary concrete 19, the secondary concrete 21, and the ground G, and the remaining portion of the guide member 16 functions as a support pile.

また、第１実施形態と同様、接続管４０の流水路連結管１３の内側端部１３ａと外側端部１３ｂにそれぞれ鋼製の蓋体２２を取り付け、流水路連結管１３の内部を密閉する（蓋体取付工程）。 Further, as in the first embodiment, the steel lids 22 are attached to the inner end 13a and the outer end 13b of the flow channel connecting pipe 13 of the connecting pipe 40, respectively, to seal the inside of the flowing channel connecting pipe 13 ( Lid mounting process).

次に、図２４に示すように、蓋体２２で密閉した流水路連結管１３の内部の水Ｗを抜きつつモルタル２３を注入し、流水路連結管１３の内部にモルタル（充填材）２３を充填する（流水路連結管内充填工程）。 Next, as shown in FIG. 24, the mortar 23 is injected while draining the water W inside the flow channel connecting pipe 13 sealed by the lid 22, and the mortar (filler) 23 is placed inside the flowing channel connecting pipe 13. Filling (filling process in the running water channel connecting pipe).

流水路連結管１３の内部のモルタル２３が硬化し所定の強度を発現した段階で、図２５に示すように、外側端部１３ｂに取り付けた蓋体２２を撤去し（蓋体撤去工程）、流水路連結管１３が埋設されるように、縦管１２と土留め壁１の間に３次コンクリート２４を打設する（３次コンクリート打設工程）。 When the mortar 23 inside the water flow channel connecting pipe 13 is hardened and develops a predetermined strength, as shown in FIG. 25, the lid 22 attached to the outer end 13b is removed (lid removal step), and running water The tertiary concrete 24 is placed between the vertical pipe 12 and the retaining wall 1 so that the road connecting pipe 13 is buried (tertiary concrete placing step).

次に、図２６、図２７に示すように、放水管４１を敷設する位置の地盤Ｇを開削するとともに、この部位に対向する土留め壁１の鋼矢板を引き抜いて除去する。さらに、基礎砕石（及び／又は基礎コンクリート）４３を敷設するとともに放水管４１を設置し、放水管４１を接続管４０の放水管連結管４２に接続する。 Next, as shown in FIGS. 26 and 27, the ground G at the position where the water discharge pipe 41 is laid is excavated, and the steel sheet pile of the earth retaining wall 1 facing this portion is pulled out and removed. Further, a foundation crushed stone (and / or foundation concrete) 43 is laid and a water discharge pipe 41 is installed, and the water discharge pipe 41 is connected to the water discharge pipe connecting pipe 42 of the connecting pipe 40.

次に、図２８に示すように、３次コンクリート２４の上方の縦管１２と土留め壁１の間に捨石（砕石）２５を充填する（砕石充填／敷設工程）。土留め壁１を形成する鋼矢板を引き抜いて撤去する（土留め壁撤去工程）。また、放水管４１、放水管連結管４２の上方に捨石２５を投入して敷き均す（砕石充填／敷設工程）。 Next, as shown in FIG. 28, rubble (crushed stone) 25 is filled between the vertical pipe 12 above the tertiary concrete 24 and the retaining wall 1 (crushed stone filling / laying step). The steel sheet pile forming the earth retaining wall 1 is pulled out and removed (earth retaining wall removing step). Further, the rubble 25 is thrown above the water discharge pipe 41 and the water discharge pipe connecting pipe 42 and spread evenly (crushed stone filling / laying step).

次に、第１実施形態と同様、図２９、図３０に示すように、シールドマシン３０を用い、セグメント３１を組み付けつつシールドマシン３０を推進させ、水底地盤Ｇに放水路（シールドトンネル）５を構築する（流水路構築工程）。そして、シールド到達部の流水路連結管１３にシールドマシン３０を到達させる。このとき、シールドマシン３０で縦管１２の周囲の地盤Ｇから３次コンクリート２４、さらに流水路連結管１３の外側端部１３ｂの開口を通じて流水路連結管１３内のモルタル２３を掘削し、内側端部１３ａの蓋体２２直近までシールドマシン３０を推進させる。 Next, as in the first embodiment, as shown in FIGS. 29 and 30, the shield machine 30 is used to propel the shield machine 30 while assembling the segment 31, and the flood channel (shield tunnel) 5 is provided in the submerged ground G. Build (flow channel construction process). Then, the shield machine 30 is brought to reach the flow channel connecting pipe 13 of the shield reaching portion. At this time, the shield machine 30 excavates the tertiary concrete 24 from the ground G around the vertical pipe 12 and the mortar 23 in the water flow channel connecting pipe 13 through the opening of the outer end portion 13b of the flowing water channel connecting pipe 13, and the inner end. The shield machine 30 is propelled to the immediate vicinity of the lid 22 of the portion 13a.

流水路連結管１３の内側端部１３ａに取り付けた蓋体２２の直近までシールドマシン３０が到達した段階で、シールドマシン３０の外殻の周囲、外殻と流水路連結管１３の境界部分（接合部）に止水モルタル／止水グラウト３２を充填するなどし、この部分の止水処理を施す（止水処理工程）。 When the shield machine 30 reaches the immediate vicinity of the lid 22 attached to the inner end 13a of the water flow channel connecting pipe 13, the periphery of the outer shell of the shield machine 30 and the boundary portion (joining) between the outer shell and the flowing water channel connecting pipe 13. Part) is filled with water-stopping mortar / water-stopping grout 32 to perform water-stopping treatment on this part (water-stopping treatment step).

次に、シールドマシン３０の外殻を残し、シールドマシン３０の他の装置、部材、機器等を解体するとともにシールドトンネル５を通じて外部に搬出して除去する（シールドマシン解体撤去工程）。これにより、シールドマシン３０の解体撤去をシールドトンネル５の取水路内のドライ環境で行うことができる。 Next, the outer shell of the shield machine 30 is left, and other devices, members, devices and the like of the shield machine 30 are disassembled and carried out through the shield tunnel 5 to be removed (shield machine disassembly and removal step). As a result, the shield machine 30 can be disassembled and removed in a dry environment in the intake channel of the shield tunnel 5.

次に、図１９に示すように、シールドトンネル５の内部に注水し、流水路連結管１３の内側端部１３ａに取り付けた蓋体２２を撤去する（流水路連通工程）。このとき、流水路連結管１３ひいては取水路（シールドトンネル）５の径よりも縦管１２の径が大きいことにより、取り外した蓋体２２を縦管１２の上部から引き抜いて撤去することができる。 Next, as shown in FIG. 19, water is injected into the shield tunnel 5 and the lid 22 attached to the inner end 13a of the flow channel connecting pipe 13 is removed (flow channel communication step). At this time, since the diameter of the vertical pipe 12 is larger than the diameter of the water flow channel connecting pipe 13 and thus the intake channel (shield tunnel) 5, the removed lid 22 can be pulled out from the upper part of the vertical pipe 12 and removed.

さらに、縦管１２の上端部に鋼製の蓋体４４を取り付けて封止する。 Further, a steel lid 44 is attached to the upper end of the vertical pipe 12 and sealed.

最後に、縦管１２の周囲、縦管１２に取り付けた蓋体４４上及び水底Ｇ１上に捨石２５を投入して敷き均し、本実施形態の放水口構造Ｂが完成する。 Finally, the rubble 25 is thrown and leveled around the vertical pipe 12, on the lid 44 attached to the vertical pipe 12, and on the water bottom G1, and the water discharge port structure B of the present embodiment is completed.

したがって、本実施形態の取放水口構造（放水口構造）Ｂ及び取放水口構造Ｂの施工方法においても、従来のＪ型やＳ型の接続管ではなく、軸線Ｏ１が上下方向に延びる縦管１２に、軸線Ｏ１、Ｏ２が交差するように一体に流水路連結管１３を取り付けて接続管４０を構成したことにより、接続管４０の幅（横方向の寸法）を従来よりも小さくすることができる。また、接続管４０を縦管１２と流水路連結管１３、放水管連結管４２で構成し、その幅が小さくなることで、これを支持するための架台１８も小さく簡易な構造とすることができる。 Therefore, even in the construction method of the water intake / discharge port structure (water discharge port structure) B and the water intake / discharge port structure B of the present embodiment, the vertical pipe whose axis line O1 extends in the vertical direction is not the conventional J-type or S-type connection pipe. By integrally attaching the flow channel connecting pipe 13 to the 12 so that the axes O1 and O2 intersect to form the connecting pipe 40, the width (horizontal dimension) of the connecting pipe 40 can be made smaller than before. it can. Further, the connecting pipe 40 is composed of a vertical pipe 12, a water flow channel connecting pipe 13, and a water discharge pipe connecting pipe 42, and the width thereof is reduced so that the gantry 18 for supporting the connecting pipe 40 can be made a small and simple structure. it can.

これにより、従来と比較し、土留め壁１で囲まれた水底管路接続部Ｓの領域を小さくすることができ、すなわち、水中立坑の規模を小さくすることができ、工期の短期化、低コスト化、安全性の向上を図ることが可能になる。 As a result, the area of the submerged pipe connection portion S surrounded by the retaining wall 1 can be reduced, that is, the scale of the underwater shaft can be reduced, and the construction period can be shortened and reduced as compared with the conventional case. It is possible to reduce costs and improve safety.

また、本実施形態の取放水口構造Ｂの施工方法においては、接続管１０の流水路連結管１３の両端部１３ａ、１３ｂに蓋体２２を取り付けて流水路連結管１３の内部を密閉するとともにモルタル２３を充填した後、流水路連結管１３の外側端部１３ｂの蓋体２２を取り外してシールドマシン３０を流水路連結管１３の内部まで掘進／到達させるようにした。これにより、シールドマシン３０で構築した流水路５と流水路連結管１３の内部を連通させることができ、シールドマシン３０をドライ環境で解体し、流水路５を通じて外部に搬出除去することが可能になる。 Further, in the construction method of the intake / discharge port structure B of the present embodiment, the lids 22 are attached to both ends 13a and 13b of the water flow channel connecting pipe 13 of the connecting pipe 10 to seal the inside of the water flow channel connecting pipe 13. After filling the mortar 23, the lid 22 of the outer end 13b of the flow channel connecting pipe 13 was removed so that the shield machine 30 could be dug / reached to the inside of the flowing water channel connecting pipe 13. As a result, the flow channel 5 constructed by the shield machine 30 and the inside of the flow channel connecting pipe 13 can be communicated with each other, and the shield machine 30 can be disassembled in a dry environment and carried out and removed through the flow channel 5. Become.

すなわち、縦管１２の内部に水が満たされ、縦管１２の内部に突出する流水路連結管１３の内側端部１３ａ側、及び内側端部１３ａに取り付けた蓋体２２で水圧を受けるようにすればよいため、従来のように取放水路として設計すべき接続管４０を大きな外部水圧に耐える構造にする必要がなく、要求される強度やコストに応じた接続管４０を用いて取放水口構造Ｂを構築することが可能になる。 That is, the inside of the vertical pipe 12 is filled with water, and the water pressure is received by the inner end 13a side of the flow channel connecting pipe 13 protruding inside the vertical pipe 12 and the lid 22 attached to the inner end 13a. Therefore, it is not necessary to make the connection pipe 40, which should be designed as an intake / discharge channel, a structure that can withstand a large external water pressure as in the conventional case, and the connection pipe 40 according to the required strength and cost is used for the intake / discharge port. It becomes possible to construct the structure B.

したがって、本実施形態の取放水口構造Ｂ及び取放水口構造Ｂの施工方法によれば、従来と比較し、施工性、経済性、安全性に優れた取放水口構造Ｂを実現、提供することが可能になる。 Therefore, according to the construction method of the intake / discharge port structure B and the intake / discharge port structure B of the present embodiment, the intake / discharge port structure B having excellent workability, economy, and safety as compared with the conventional one is realized and provided. Will be possible.

なお、本実施形態は、上記の作用効果だけでなく、第１実施形態と同様の作用効果を得ることができる。 In addition, this embodiment can obtain not only the above-mentioned effects but also the same effects as those of the first embodiment.

以上、本発明に係る取水口構造及び取水口構造の施工方法の第１、第２実施形態について説明したが、本発明は上記の第１、第２実施形態に限定されるものではなく、その趣旨を逸脱しない範囲で適宜変更可能である。 Although the first and second embodiments of the intake structure and the method of constructing the intake structure according to the present invention have been described above, the present invention is not limited to the above first and second embodiments. It can be changed as appropriate without departing from the purpose.

例えば、本発明に係る取水口構造及び取水口構造の施工方法は、発電施設の取水設備、放水設備に限定して適用する必要はなく、取水、放水を必要とするあらゆる施設、設備に適用可能である。 For example, the method of constructing the intake structure and the intake structure according to the present invention does not have to be applied only to the intake equipment and the water discharge equipment of the power generation facility, and can be applied to all the facilities and equipment requiring water intake and water discharge. Is.

また、流水路５は必ずしもシールドマシンを用いて構築しなくてもよい。 Further, the running water channel 5 does not necessarily have to be constructed by using a shield machine.

１ 土留め壁（鋼矢板）
２ 従来の接続管
２ａ Ｊ型の接続管
２ｂ Ｓ型の接続管
３ 従来の架台
４ 鞘管（流水路連結管）
５ シールドトンネル（流水路、取水路、放水路）
６ 蓋
１０ 接続管（取水口）
１１ 取水口
１２ 縦管
１３ 流水路連結管（シールド到達部鞘管）
１３ａ 内側端部
１３ｂ 外側端部
１４ 縦管補強材
１５ 縦管ガイド枠
１６ ガイド杭（ガイド部材）
１７ ブラケット
１８ 架台
１８ａ 鋼材
１８ｂ ガイド鋼管
１９ １次コンクリート
２０ 位置調整治具
２１ ２次コンクリート
２２ 蓋体
２３ モルタル
２４ ３次コンクリート
２５ 捨石（砕石）
３０ シールドマシン
３１ セグメント
３２ 止水モルタル
３３ 障害物侵入防止網
４０ 接続管（放水口）
４１ 放水管（放水口）
４２ 放水管連結管
４３ 基礎砕石
４４ 蓋体
Ａ 取放水口構造（取水口構造）
Ｂ 取放水口構造（放水口構造）
Ｇ 水底地盤
Ｇ１ 水底
Ｏ１ 軸線
Ｏ２ 軸線
Ｏ３ 軸線
Ｓ 水底管路接続部（水中立坑）
Ｗ 水
Ｗ１ 水面 1 Retaining wall (steel sheet pile)
2 Conventional connection pipe 2a J-type connection pipe 2b S-type connection pipe 3 Conventional pedestal 4 Sheath pipe (flow channel connection pipe)
5 Shield tunnel (flow channel, intake channel, flood channel)
6 Lid 10 Connection pipe (water intake)
11 Intake port 12 Vertical pipe 13 Flow channel connecting pipe (shield reaching part sheath pipe)
13a Inner end 13b Outer end 14 Vertical pipe reinforcement 15 Vertical pipe guide frame 16 Guide pile (guide member)
17 Bracket 18 Stand 18a Steel 18b Guide steel pipe 19 Primary concrete 20 Position adjustment jig 21 Secondary concrete 22 Lid 23 Mortar 24 Tertiary concrete 25 Crushed stone
30 Shield machine 31 Segment 32 Water stop mortar 33 Obstacle intrusion prevention net 40 Connection pipe (water outlet)
41 Water pipe (water outlet)
42 Water discharge pipe connecting pipe 43 Foundation crushed stone 44 Lid body A Water intake / discharge port structure (water intake structure)
B Intake / discharge port structure (water discharge port structure)
G Underwater ground G1 Underwater O1 Axis line O2 Axis line O3 Axis line S Underwater pipeline connection (underwater shaft)
W water W1 water surface

Claims (5)

水底から所定深度の地盤中に土留め壁を設置する土留め壁設置工程と、
前記土留め壁で囲まれた内部地盤を掘削する水底地盤掘削工程と、
上下方向に軸線方向を向けて配設される縦管、及び前記縦管を貫通するように且つ前記縦管と互いの軸線が交差するようにして前記縦管に一体に配設された流水路連結管からなる接続管を、前記水底地盤掘削工程で形成された前記土留め壁内の水底管路接続部の所定位置に設置する接続管設置工程とを備え、
前記水底管路接続部の所定位置に設置した前記接続管の前記流水路連結管の内側端部と外側端部にそれぞれ蓋体を取り付けて前記流水路連結管の内部を密閉する蓋体取付工程と、
前記蓋体で密閉した前記流水路連結管の内部の水を抜きつつ前記流水路連結管の内部に充填材を充填する流水路連結管内充填工程と、
前記流水路連結管の内部に前記充填材を充填した後、前記外側端部に取り付けた蓋体を撤去する蓋体撤去工程と、
前記流水路連結管の外側端部に取水路あるいは放水路となる流水路を接続するとともに、少なくとも一部の前記充填材を除去して前記流水路連結管の内部と前記流水路の内部を連通させる流水路構築工程と、
前記流水路及び前記流水路連結管の内部に注水するとともに前記流水路連結管の内側端部に取り付けた蓋体を撤去する流水路連通工程とを備えることを特徴とする取放水口構造の施工方法。 The earth retaining wall installation process to install the earth retaining wall in the ground at a predetermined depth from the seabed,
Underwater ground excavation process for excavating the internal ground surrounded by the earth retaining wall, and
A vertical pipe arranged so as to face the axial direction in the vertical direction, and a running water channel integrally arranged in the vertical pipe so as to penetrate the vertical pipe and intersect the vertical pipes with each other. It is provided with a connecting pipe installation step of installing a connecting pipe made of a connecting pipe at a predetermined position of a submerged pipeline connecting portion in the retaining wall formed in the submerged ground excavation step .
A lid attachment step of attaching lids to the inner and outer ends of the flow channel connecting pipe of the connecting pipe installed at a predetermined position of the bottom conduit connecting portion to seal the inside of the flowing channel connecting pipe. When,
A filling step in the flow channel connecting pipe, which fills the inside of the flowing channel connecting pipe with a filler while draining water from the inside of the flowing water channel connecting pipe sealed with the lid.
A lid removing step of filling the inside of the flow channel connecting pipe with the filler and then removing the lid attached to the outer end portion.
A water flow channel serving as an intake channel or a water discharge channel is connected to the outer end of the water flow channel connecting pipe, and at least a part of the filler is removed to communicate the inside of the water flow channel connecting pipe and the inside of the water flow channel. The flow channel construction process and
Construction of an intake / discharge port structure including a flow channel communication step of injecting water into the flow channel and the flow channel connecting pipe and removing a lid attached to the inner end of the flow channel connecting pipe. Method. 請求項１に記載の取放水口構造の施工方法において、
前記流水路構築工程では、シールドマシンを用いて水底地盤に流水路を構築するとともに、前記シールドマシンで前記流水路連結管の外側端部の開口から前記流水路連結管内の充填材を掘削して前記流水路連結管の内部と前記流水路の内部を連通させ、前記流水路を通じ、前記シールドマシンをドライ環境で解体撤去するようにしたことを特徴とする取放水口構造の施工方法。 In the construction method of the intake / discharge port structure according to claim 1,
In the flow channel construction step, a shield machine is used to construct a flow channel on the bottom ground, and the shield machine excavates a filler in the flow channel connection pipe from an opening at the outer end of the flow channel connection pipe. A method for constructing an intake / discharge port structure, characterized in that the inside of the water flow channel connecting pipe and the inside of the water flow channel are communicated with each other, and the shield machine is disassembled and removed in a dry environment through the water flow channel. 請求項１または請求項２に記載の取放水口構造の施工方法において、
前記水底地盤掘削工程で形成された前記土留め壁内の水底管路接続部にガイド部材を上下方向に立設するガイド部材設置工程を備え、
前記接続管設置工程では、前記ガイド部材に案内させつつ前記水底管路接続部の所定位置に前記接続管を設置することを特徴とする取放水口構造の施工方法。 In the construction method of the intake / discharge port structure according to claim 1 or 2.
It is provided with a guide member installation process for vertically installing a guide member at the submersible pipeline connection portion in the earth retaining wall formed in the submerged ground excavation process.
In the connection pipe installation step, a method of constructing an intake / discharge port structure, characterized in that the connection pipe is installed at a predetermined position of the bottom pipeline connection portion while being guided by the guide member. 請求項３記載の取放水口構造の施工方法において、
前記ガイド部材と前記接続管の縦管を固定部で一体に固定し、前記固定部よりも上方の前記ガイド部材を切断撤去し、前記ガイド部材の残部を支持杭とすることを特徴とする取放水口構造の施工方法。 In the construction method of the intake / discharge port structure according to claim 3,
Said guide member and the vertical tube of said connection tube is integrally fixed to the fixed portion, the said guide member upper cut removed than the fixed portion, characterized in that the supporting piles the remainder of the guide member Construction method of intake / discharge port structure. 請求項３または請求項４に記載の取放水口構造の施工方法において、
前記ガイド部材で案内させつつ架台を前記水底管路接続部の所定位置に設置する架台設置工程を備え、
前記接続管設置工程では、前記ガイド部材に案内させつつ前記架台上に前記接続管を設置することを特徴とする取放水口構造の施工方法。 In the construction method of the intake / discharge port structure according to claim 3 or 4.
It is provided with a pedestal installation step of installing the gantry at a predetermined position of the submarine pipeline connection portion while guiding it with the guide member.
In the connection pipe installation step, a method of constructing an intake / discharge port structure, characterized in that the connection pipe is installed on the gantry while being guided by the guide member.

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