JP2022012707A - Sheath connection structure - Google Patents

Sheath connection structure Download PDF

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JP2022012707A
JP2022012707A JP2020114731A JP2020114731A JP2022012707A JP 2022012707 A JP2022012707 A JP 2022012707A JP 2020114731 A JP2020114731 A JP 2020114731A JP 2020114731 A JP2020114731 A JP 2020114731A JP 2022012707 A JP2022012707 A JP 2022012707A
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sheath
cylinder axis
cross
connection structure
flat inner
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JP7485558B2 (en
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剛史 川村
Takashi Kawamura
一治 宇田川
Kazuharu Udagawa
光尚 阪井
Mitsuhisa Sakai
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Kurimoto Ltd
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Abstract

To connect sheaths with a simple constitution and simple work.SOLUTION: A sheath connection structure includes: a first cylindrical sheath 20 embedded in a first concrete member 1; a second cylindrical sheath 30 embedded in a second concrete member 2; a cylindrical intermediate sheath 40 for connecting the first sheath 20 and the second sheath 30; a first flat inner face part 24 which is provided in the inner surface of the first sheath 20, is parallel to a cylindrical shaft in any longitudinal section passing through the cylindrical shaft, and holds the first sheath 20 and the intermediate sheath 40 so as to be relatively movable in the cylindrical shaft direction; a stopper part 25 which is provided at an end on the back side of the first flat inner face part 24 and regulates the entry of the intermediate sheath 40; and holding means 60 for regulating movement of the intermediate sheath 40 to the second sheath 30 side in a state where the entry of the intermediate sheath 40 is regulated by the stopper part 25.SELECTED DRAWING: Figure 3

Description

この発明は、シースの接続構造に関するものである。 The present invention relates to a sheath connection structure.

従来から、工場や専用のヤード等において予めコンクリート部材を製作し、そのコンクリート部材を現場に運搬して一体化する工法がある。この工法はプレキャスト工法と呼ばれ、各種建築物をはじめ、橋梁、床版、地下構造物、その他各種土木構造物にも用いられている。このプレキャスト工法によって構築された構造をプレキャスト構造という。 Conventionally, there has been a construction method in which concrete members are manufactured in advance in a factory or a dedicated yard, and the concrete members are transported to the site and integrated. This construction method is called the precast construction method, and is used not only for various buildings, but also for bridges, decks, underground structures, and various other civil engineering structures. The structure constructed by this precast method is called a precast structure.

プレキャスト工法で用いられるコンクリート部材には、PC鋼材挿通用の管であるシースが埋設されている。コンクリート部材を現場に搬入し、互いに隣接するコンクリート部材のシース同士を接続して、その内部にPC鋼材を挿通してプレストレスを導入する。その後、シースの内部にモルタル等の充填剤を流し込んで、コンクリート部材同士を一体化している。 A sheath, which is a pipe for inserting a PC steel material, is embedded in the concrete member used in the precast method. The concrete members are brought to the site, the sheaths of the adjacent concrete members are connected to each other, and the PC steel material is inserted inside the sheaths to introduce prestress. After that, a filler such as mortar is poured into the sheath to integrate the concrete members.

シース同士の接続は、一方のコンクリート部材のシースと他方のコンクリート部材のシースとが、中間の接続用シースによって接続されているものが一般的である。例えば、特許文献1では、中間の接続用シースとして用いられる間詰シースの外周に、一対の筒状パッキンを摺動自在としたものを採用している。一対の筒状パッキンの外周面は、それぞれ外端方向を肉薄とし対向方向を肉厚としたテーパ状であり、そのテーパ状の外周面が、両側のコンクリート部材(第1の橋桁及び第2の橋桁)に埋設されたシース(シース本体)の内面に隙間なく密着するようになっている。 As for the connection between the sheaths, the sheath of one concrete member and the sheath of the other concrete member are generally connected by an intermediate connecting sheath. For example, Patent Document 1 employs a slidable pair of tubular packings on the outer periphery of a padded sheath used as an intermediate connecting sheath. The outer peripheral surfaces of the pair of tubular packings are tapered with the outer end direction being thin and the facing direction being thick, and the tapered outer peripheral surfaces are the concrete members (first bridge girder and second bridge girder) on both sides. The sheath (sheath body) embedded in the bridge girder) is in close contact with the inner surface without any gaps.

また、例えば、特許文献2では、中間の接続用シースとして用いられる内継ぎシースが、その外面に螺旋を有しており、内継ぎシースの外面の螺旋に螺合する定着駒を、コンクリート部材(コンクリートユニット)の対向面に圧接して、内継ぎシースがコンクリート部材に埋設されたシース(外シース)に接続されている。また、例えば、特許文献3では、中間の接続用シースとして用いられるシース用継手を、一方のコンクリート部材(コンクリート床版)のシースに連結される第1接続管と、他方のコンクリート部材(コンクリート床版)のシースに連結される第2接続管とで構成している。そして、第1接続管と第2接続管の端部同士を、互いに管軸方向に移動可能な状態で嵌合している。 Further, for example, in Patent Document 2, the inner joint sheath used as the intermediate connection sheath has a spiral on the outer surface thereof, and the fixing piece screwed into the spiral on the outer surface of the inner joint sheath is a concrete member ( The inner joint sheath is connected to the sheath (outer sheath) embedded in the concrete member by pressure contacting the facing surface of the concrete unit). Further, for example, in Patent Document 3, a first connecting pipe for connecting a sheath joint used as an intermediate connecting sheath to the sheath of one concrete member (concrete deck) and the other concrete member (concrete floor). It is composed of a second connecting pipe connected to the sheath of the plate). Then, the ends of the first connecting pipe and the second connecting pipe are fitted to each other in a state where they can move in the direction of the pipe axis.

特公平6-39764号公報Special Fair 6-39764 Gazette 特開平11-343702号公報Japanese Unexamined Patent Publication No. 11-343702 特開2003-301560号公報Japanese Patent Application Laid-Open No. 2003-301560

特許文献1,2に示すシースの接続構造では、テーパ状の外面を有する筒状パッキンや、特殊な形状を有する定着駒など、いずれも特殊な形状を有する専用部品を製作する必要がある。専用部品を用いることは、コスト高に繋がるので改善の余地がある。また、特許文献3に示すシースの接続構造では、専用部品への依存は少ないといえる。しかし、隣接するコンクリート部材同士の隙間が場所に応じて異なる状況で、作業中に接続用のシース用継手がコンクリート部材のシースの内部にどの程度入り込んでいるのかがわかりにくいという問題がある。 In the sheath connection structure shown in Patent Documents 1 and 2, it is necessary to manufacture special parts having a special shape, such as a tubular packing having a tapered outer surface and a fixing piece having a special shape. There is room for improvement because using special parts leads to high costs. Further, it can be said that the sheath connection structure shown in Patent Document 3 is less dependent on dedicated parts. However, in a situation where the gap between adjacent concrete members differs depending on the location, there is a problem that it is difficult to understand how much the sheath joint for connection has entered the inside of the sheath of the concrete member during work.

そこで、この発明の課題は、できる限り簡素な構成で且つ簡単な作業で、コンクリート部材に埋設されるシース同士を接続できるようにすることである。 Therefore, an object of the present invention is to enable the sheaths embedded in the concrete member to be connected to each other with the simplest possible configuration and simple operation.

上記の課題を解決するために、この発明は、第1のコンクリート部材に埋設される筒状の第1シースと、第2のコンクリート部材に埋設される筒状の第2シースと、前記第1シース及び前記第2シースを接続する筒状の中間シースと、前記第1シースの内面に設けられ、筒軸を通る任意の縦断面で筒軸に平行であり、前記第1シースと前記中間シースとを筒軸方向に沿って相対移動可能に保持する第1平坦内面部と、前記第1平坦内面部の奥側の端部に設けられ前記中間シースの侵入を規制するストッパ部と、前記中間シースが前記ストッパ部により侵入を規制された状態で、前記第2シース側への前記中間シースの移動を規制する保持手段と、を備えているシースの接続構造を採用した。 In order to solve the above problems, the present invention has a tubular first sheath embedded in a first concrete member, a tubular second sheath embedded in a second concrete member, and the first sheath. A cylindrical intermediate sheath connecting the sheath and the second sheath, and an arbitrary vertical cross section provided on the inner surface of the first sheath and parallel to the cylindrical shaft, the first sheath and the intermediate sheath are parallel to the cylinder shaft. A first flat inner surface portion that holds the concrete so as to be relatively movable along the cylindrical axis direction, a stopper portion provided at an end portion on the inner side of the first flat inner surface portion and restricting the intrusion of the intermediate sheath, and the intermediate portion. A sheath connection structure comprising a holding means for restricting the movement of the intermediate sheath to the second sheath side while the sheath is restricted from entering by the stopper portion is adopted.

ここで、前記第1シースは、その内面が前記第1平坦内面部を形成する筒状部材と、前記筒状部材を外側から保持する断面拡大部と、前記断面拡大部に接続され前記断面拡大部の内面よりも小断面の内面を有する一般部と、を備え、前記ストッパ部は、前記断面拡大部の内面と前記一般部の内面との間に設けられた段部又はテーパ部である構成を採用することができる。 Here, the first sheath is connected to a tubular member whose inner surface forms the first flat inner surface portion, a cross-sectional enlarged portion that holds the tubular member from the outside, and the cross-sectional enlarged portion. A general portion having an inner surface having a smaller cross section than the inner surface of the portion is provided, and the stopper portion is a stepped portion or a tapered portion provided between the inner surface of the cross-sectional enlarged portion and the inner surface of the general portion. Can be adopted.

これらの各態様において、前記第2シースの内面に、筒軸を通る任意の縦断面で筒軸に平行であり、前記保持手段による前記中間シースの侵入の規制が解除された状態で、前記第2シースと前記中間シースとを筒軸方向に沿って相対移動可能に保持する第2平坦内面部を備えている構成を採用することができる。 In each of these embodiments, the second sheath is parallel to the inner surface of the second sheath with an arbitrary vertical cross section passing through the cylinder shaft, and the restriction on the invasion of the intermediate sheath by the holding means is released. A configuration having a second flat inner surface portion that holds the two sheaths and the intermediate sheath so as to be relatively movable along the cylinder axis direction can be adopted.

このとき、前記中間シースの外面に、前記第1平坦内面部及び前記第2平坦内面部にそれぞれ摺接するシール部材を備えている構成を採用することができる。また、前記シール部材は、水膨張性能を有している素材である構成を採用することができる。 At this time, it is possible to adopt a configuration in which the outer surface of the intermediate sheath is provided with a seal member that is in sliding contact with the first flat inner surface portion and the second flat inner surface portion, respectively. Further, the seal member can adopt a structure which is a material having water expansion performance.

これらの各態様において、前記保持手段は、前記中間シースの外周にねじ結合されて筒軸回りに回転させることで前記中間シースに対して筒軸方向へ相対移動するナットを備えている構成を採用することができる。 In each of these embodiments, the holding means adopts a configuration including a nut that is screwed to the outer periphery of the intermediate sheath and is rotated around the cylinder axis to move relative to the intermediate sheath in the cylinder axis direction. can do.

また、前記保持手段は、前記第2シースと前記中間シースとを筒軸方向へ相対移動可能にねじ結合するねじ部を備えている構成を採用することができる。 Further, the holding means can adopt a configuration including a screw portion for screw-coupling the second sheath and the intermediate sheath so as to be relatively movable in the tubular axis direction.

さらに、前記中間シースは、前記第2シースに接続される筒状の本体部と、前記本体部に接続される筒状の延長部とを備え、前記本体部の内面に、筒軸を通る任意の縦断面で筒軸に平行であり、前記本体部と前記延長部とを筒軸方向に沿って相対移動可能に保持する中間平坦内面部を備えている構成を採用することができる。 Further, the intermediate sheath includes a cylindrical main body portion connected to the second sheath and a tubular extension portion connected to the main body portion, and is arbitrarily formed on the inner surface of the main body portion through a cylindrical shaft. It is possible to adopt a configuration having an intermediate flat inner surface portion which is parallel to the cylinder axis in the vertical cross section of the above and holds the main body portion and the extension portion so as to be relatively movable along the cylinder axis direction.

この発明によれば、簡素な構成で且つ簡単な作業で、コンクリート部材に埋設されるシース同士を接続できるようになる。 According to the present invention, the sheaths embedded in the concrete member can be connected to each other with a simple structure and a simple operation.

この発明の第1の実施形態を示し、中間シースを第2シースに挿入した状態を示す縦断面図A vertical cross-sectional view showing a first embodiment of the present invention and showing a state in which an intermediate sheath is inserted into a second sheath. 同実施形態を示し、中間シースを第1シースに挿入した状態を示す縦断面図A vertical cross-sectional view showing the same embodiment and showing a state in which the intermediate sheath is inserted into the first sheath. 同実施形態を示し、保持手段を第2シース側に締め付けた状態を示す縦断面図A vertical sectional view showing the same embodiment and showing a state in which the holding means is tightened to the second sheath side. 同実施形態の変形例を示す縦断面図Vertical sectional view showing a modified example of the same embodiment 同実施形態の変形例を示す縦断面図Vertical sectional view showing a modified example of the same embodiment この発明の第2の実施形態を示し、中間シースを第2シースに挿入した状態を示す縦断面図A vertical sectional view showing a second embodiment of the present invention and showing a state in which an intermediate sheath is inserted into the second sheath. 同実施形態を示し、中間シースを第1シースに挿入した状態を示す縦断面図A vertical cross-sectional view showing the same embodiment and showing a state in which the intermediate sheath is inserted into the first sheath.

この発明の実施形態を、図面に基づいて説明する。この実施形態は、プレキャスト工法で使用されるコンクリート部材(プレキャストコンクリート)に埋設されるシース同士を接続するシースの接続構造10及びその接続工法について説明する。この実施形態のシースの接続構造10は、隣接する第1のコンクリート部材1及び第2のコンクリート部材2を一体化するために用いられるものである。実施形態では、隣り合う2つのコンクリート部材を接続するものであるが、並列する3つ以上のコンクリート部材を接続するものであってもよい。 An embodiment of the present invention will be described with reference to the drawings. This embodiment describes a sheath connection structure 10 for connecting sheaths embedded in a concrete member (precast concrete) used in the precast method, and a connection method thereof. The sheath connection structure 10 of this embodiment is used to integrate the adjacent first concrete member 1 and the second concrete member 2. In the embodiment, two adjacent concrete members are connected, but three or more concrete members in parallel may be connected.

第1の実施形態を図1~図5に示す。第1のコンクリート部材1には筒状の第1シース20が埋設されている。また、第2のコンクリート部材2には筒状の第2シース30が埋設されている。また、第1シース20と第2シース30とを接続するために、筒状の中間シース40が用いられる。各シースの素材は、コンクリートの打ち込みの際に変形しにくく、その継目からセメントペーストが流入しないものが好ましく、例えば、ポリエチレン等の可撓性のある軟質樹脂が多用される。また、シースには、その内部をPC鋼材が通過し得る断面形状を有する筒状体(チューブ)が採用され、この実施形態のように、通常は円形断面のものが用いられる。 The first embodiment is shown in FIGS. 1 to 5. A cylindrical first sheath 20 is embedded in the first concrete member 1. Further, a tubular second sheath 30 is embedded in the second concrete member 2. Further, a tubular intermediate sheath 40 is used to connect the first sheath 20 and the second sheath 30. The material of each sheath is preferably one that is not easily deformed when concrete is poured and cement paste does not flow in from the seam, and for example, a flexible soft resin such as polyethylene is often used. Further, as the sheath, a tubular body (tube) having a cross-sectional shape through which the PC steel material can pass is adopted, and as in this embodiment, a sheath having a circular cross section is usually used.

第1シース20は、図1に示すように、筒軸を通る任意の縦断面で筒軸に平行である第1平坦内面部24と、その第1平坦内面部24の奥側の端部に設けられるストッパ部25とを備えている。第1平坦内面部24は、金属製又は硬質樹脂製の筒状部材23の内面で構成されている。筒状部材23は断面円形であるので、第1平坦内面部24は円筒面である。また、第1シース20は、筒状部材23を外側から保持する断面拡大部22と、その断面拡大部22に接続されて、断面拡大部22の内面よりも小断面の内面を有する一般部21を備えている。一般部21も断面円形であるが、その強度を高めるために一般部21の全周に螺旋状のリブ21aが設けられている。一般部21と断面拡大部22は可撓性のある樹脂の成型品である。断面拡大部22は、筒状部材23の圧入によって一般部21よりも外径側へ膨出した形状となっている。ストッパ部25は、断面拡大部22の内面と一般部21の内面との間に設けられた段部で構成されている。断面拡大部22の外面と一般部21の外面との間は、両者を取り付けるテーパ面26となっている。第1シース20は、断面拡大部22の開口側の端縁が、第1のコンクリート部材1の端面(対向面)1aと面一になるように、第1のコンクリート部材1を構成するコンクリートC内に埋設されている。なお、この実施形態では、ストッパ部25を、断面拡大部22の内面と一般部21の内面との間に設けられた段部で構成しているが、これを断面拡大部22の内面と一般部21の内面との間に設けられたテーパ部等としてもよい。 As shown in FIG. 1, the first sheath 20 is formed on a first flat inner surface portion 24 that is parallel to the tubular axis in an arbitrary vertical cross section passing through the tubular axis and a rear end portion of the first flat inner surface portion 24. It is provided with a stopper portion 25 provided. The first flat inner surface portion 24 is composed of the inner surface of a tubular member 23 made of metal or hard resin. Since the tubular member 23 has a circular cross section, the first flat inner surface portion 24 is a cylindrical surface. Further, the first sheath 20 is connected to a cross-section expanding portion 22 that holds the tubular member 23 from the outside, and a general portion 21 that is connected to the cross-section expanding portion 22 and has an inner surface having a smaller cross section than the inner surface of the cross-section expanding portion 22. It is equipped with. The general portion 21 also has a circular cross section, but a spiral rib 21a is provided on the entire circumference of the general portion 21 in order to increase its strength. The general portion 21 and the cross-section enlarged portion 22 are molded products of a flexible resin. The cross-sectional enlarged portion 22 has a shape that bulges toward the outer diameter side of the general portion 21 due to the press fitting of the tubular member 23. The stopper portion 25 is composed of a step portion provided between the inner surface of the cross-section enlarged portion 22 and the inner surface of the general portion 21. Between the outer surface of the cross-section enlarged portion 22 and the outer surface of the general portion 21, there is a tapered surface 26 to which both are attached. The concrete C constituting the first concrete member 1 is such that the edge of the first sheath 20 on the opening side of the cross-section enlarged portion 22 is flush with the end surface (opposing surface) 1a of the first concrete member 1. It is buried inside. In this embodiment, the stopper portion 25 is composed of a stepped portion provided between the inner surface of the cross-section enlarged portion 22 and the inner surface of the general portion 21, but this is the inner surface of the cross-section enlarged portion 22 and the general portion. It may be a tapered portion or the like provided between the inner surface and the inner surface of the portion 21.

また、第2シース30は、図1に示すように、筒軸を通る任意の縦断面で筒軸に平行である第2平坦内面部34を備えている。第2平坦内面部34は、金属製又は硬質樹脂製の筒状部材33の内面で構成されている、筒状部材33は断面円形であるので、第2平坦内面部34は円筒面である。また、第2シース30は、筒状部材33を外側から保持する断面拡大部32と、その断面拡大部32に接続されて、断面拡大部32の内面よりも小断面の内面を有する一般部31とを備えている。一般部31及び断面拡大部32は断面円形であるが、その強度を高めるためにそれぞれの全周に螺旋状のリブ31aが設けられている。一般部31と断面拡大部32は可撓性のある樹脂の成型品である。断面拡大部32は、筒状部材33の圧入によって一般部31よりも外径側へ膨出した形状となっている。第2シース30には、断面拡大部32の内面と一般部31の内面との間にストッパ部38が設けられている。ストッパ部38は、第1シース20の場合と同様に、段部又はテーパ部等で構成することができる(実施形態ではストッパ部38をテーパ部で構成している)。断面拡大部32の外面と一般部31の外面との間は、両者を取り付けるテーパ面36となっている。第2シース30は、断面拡大部32の開口側の端縁が、第2のコンクリート部材2の端面(対向面)2a側に開口するように、第2のコンクリート部材2を構成するコンクリートC内に埋設されている。なお、上記の断面拡大部22,32における筒状部材23,33の圧入は、樹脂等の構成素材を加熱した後に行うことで容易に可能である。 Further, as shown in FIG. 1, the second sheath 30 includes a second flat inner surface portion 34 that is parallel to the cylinder axis in an arbitrary vertical cross section passing through the cylinder axis. The second flat inner surface portion 34 is composed of the inner surface of the tubular member 33 made of metal or hard resin. Since the tubular member 33 has a circular cross section, the second flat inner surface portion 34 is a cylindrical surface. Further, the second sheath 30 is connected to a cross-section expanding portion 32 that holds the tubular member 33 from the outside, and a general portion 31 that is connected to the cross-section expanding portion 32 and has an inner surface having a smaller cross section than the inner surface of the cross-section expanding portion 32. And have. The general portion 31 and the cross-section enlarged portion 32 have a circular cross-section, but spiral ribs 31a are provided on the entire circumference thereof in order to increase the strength thereof. The general portion 31 and the cross-section enlarged portion 32 are molded products of a flexible resin. The cross-sectional enlarged portion 32 has a shape that bulges toward the outer diameter side of the general portion 31 due to the press fitting of the tubular member 33. The second sheath 30 is provided with a stopper portion 38 between the inner surface of the cross-section enlarged portion 32 and the inner surface of the general portion 31. The stopper portion 38 can be formed of a stepped portion, a tapered portion, or the like as in the case of the first sheath 20 (in the embodiment, the stopper portion 38 is composed of the tapered portion). Between the outer surface of the cross-section enlarged portion 32 and the outer surface of the general portion 31, there is a tapered surface 36 to which both are attached. The second sheath 30 is formed in the concrete C constituting the second concrete member 2 so that the edge on the opening side of the cross-section enlarged portion 32 opens to the end surface (opposing surface) 2a side of the second concrete member 2. It is buried in. It should be noted that the press-fitting of the tubular members 23 and 33 in the cross-section enlarged portions 22 and 32 can be easily performed after heating the constituent material such as resin.

第2のコンクリート部材2には、第2シース30の開口部付近に、対向面2aに開口する作業用空間(切り欠き空間)3が設けられている。作業用空間3は、対向面2aから第2シース30の奥側へ向かって奥端面3aに至っている。第2シース30の断面拡大部32の開口側の端縁は、第2のコンクリート部材2の作業用空間3の奥端面3aと面一になっている。 The second concrete member 2 is provided with a work space (notch space) 3 that opens to the facing surface 2a in the vicinity of the opening of the second sheath 30. The working space 3 reaches the back end surface 3a from the facing surface 2a toward the back side of the second sheath 30. The edge of the second sheath 30 on the opening side of the cross-section enlarged portion 32 is flush with the back end surface 3a of the working space 3 of the second concrete member 2.

中間シース40は、その全長に亘って本体部41を備えている。本体部41は断面円形であるが、同じくその強度を高めるためにそれぞれの全周に螺旋状のリブ41aが設けられている。また、中間シース40は、その外周にねじ結合されているナット42を備えている。ナット42の内周の雌ねじが、本体部41の外周のリブ41a(雄ねじ)にねじ合っているので、ナット42を筒軸回りに回転させることでナット42は中間シース40に対して筒軸方向へ相対移動する。このナット42は、後述の保持手段60として機能する。本体部41及びナット42は樹脂の成型品である。このナット42は本体部41の外周にねじ合うものであればよく、例えば、ナット42として、第1シース20や第2シース30の一般部21,31の部材を、筒軸方向に対して所定の長さに切断したものを用いることができる。これにより、既存の部材を活用してナット42を製作できるので、コストダウンを図ることができる。 The intermediate sheath 40 includes a main body portion 41 over its entire length. The main body 41 has a circular cross section, but spiral ribs 41a are provided on the entire circumference thereof in order to increase its strength. Further, the intermediate sheath 40 includes a nut 42 screwed to the outer periphery thereof. Since the female screw on the inner circumference of the nut 42 is screwed on the rib 41a (male screw) on the outer circumference of the main body 41, by rotating the nut 42 around the cylinder axis, the nut 42 is oriented in the cylinder axis direction with respect to the intermediate sheath 40. Move relative to. The nut 42 functions as a holding means 60, which will be described later. The main body 41 and the nut 42 are molded resin products. The nut 42 may be screwed to the outer periphery of the main body 41. For example, as the nut 42, the members of the general portions 21 and 31 of the first sheath 20 and the second sheath 30 are designated in the tubular axial direction. It can be cut to the length of. As a result, the nut 42 can be manufactured by utilizing the existing member, so that the cost can be reduced.

中間シース40の外面には、その中間シース40が第1シース20及び第2シース30内に挿入された状態で、第1平坦内面部24及び第2平坦内面部34にそれぞれ摺接するシール部材43a,43bを備えている。シール部材43a,43bの素材は、シース内に充填されるモルタル等のグラウトが外部に漏れ出ないように、樹脂やゴム、不織布、フェルト等、ある程度の水密性を発揮するものが望ましい。特に、シール部材43a,43bの素材として、水分を含むことによりその体積が膨張する水膨張性能を有している素材(例えば、水膨張性能を有する不織布シール材)を採用すれば、その水密性をさらに高めることができる。 On the outer surface of the intermediate sheath 40, the seal member 43a is in sliding contact with the first flat inner surface portion 24 and the second flat inner surface portion 34, respectively, with the intermediate sheath 40 inserted into the first sheath 20 and the second sheath 30. , 43b. It is desirable that the materials of the sealing members 43a and 43b exhibit a certain degree of watertightness such as resin, rubber, non-woven fabric, and felt so that grout such as mortar filled in the sheath does not leak to the outside. In particular, if a material having a water-expanding performance (for example, a non-woven fabric sealing material having a water-expanding performance) whose volume expands when it contains water is adopted as the material of the sealing members 43a and 43b, the watertightness thereof. Can be further enhanced.

この第1シース20、第2シース30及び中間シース40を用いたシースの接続構造10、シースの接続方法、コンクリート部材の一体化方法について説明する。図1に示すように、第1シース20が埋設される第1のコンクリート部材1と、第2シース30が埋設される第2のコンクリート部材2とが、対向面1a,2a間の所定の隙間を介して隣接した状態である。この隙間の大きさは、現場の状況に応じて適宜増減する。第1シース20と第2シース30は、その筒軸が同一直線上になるように配置されている。 The sheath connection structure 10, the sheath connection method, and the concrete member integration method using the first sheath 20, the second sheath 30, and the intermediate sheath 40 will be described. As shown in FIG. 1, a predetermined gap between the first concrete member 1 in which the first sheath 20 is embedded and the second concrete member 2 in which the second sheath 30 is embedded is provided between the facing surfaces 1a and 2a. It is in an adjacent state via. The size of this gap may be increased or decreased as appropriate according to the situation at the site. The first sheath 20 and the second sheath 30 are arranged so that their cylinder axes are on the same straight line.

まず、図1に示すように、中間シース40の他端46を、第2シース30内に挿入する。このとき、第2平坦内面部34は、全周に亘って筒軸に平行な母線を有する円筒面で構成されているので、第2シース30と中間シース40との筒軸方向への相対移動可能がスムーズである。すなわち、第2平坦内面部34は、第2シース30と中間シース40とを筒軸方向に沿って相対移動可能に保持している。また、第2平坦内面部34には中間シース40のシール部材43bが摺動するので、その相対移動が案内されている。中間シース40の他端46は、第2平坦内面部34の奥端部に合致する位置まで挿入される。なお、このときナット42の押圧端面42aは、作業用空間3の奥端面3aよりも対向面2a側にあり、保持手段60による侵入の規制は解除された状態である。ここで、中間シース40は、その他端46がストッパ部38に当たることでそれ以上の挿入が規制されるので、中間シース40が過度に第2シース30の内部に入り込むことが防止されている。なお、第2シース30側のストッパ部38の設置は、必要に応じて省略することが可能である。 First, as shown in FIG. 1, the other end 46 of the intermediate sheath 40 is inserted into the second sheath 30. At this time, since the second flat inner surface portion 34 is composed of a cylindrical surface having a bus line parallel to the cylinder axis over the entire circumference, the second sheath 30 and the intermediate sheath 40 move relative to each other in the cylinder axis direction. The possibilities are smooth. That is, the second flat inner surface portion 34 holds the second sheath 30 and the intermediate sheath 40 so as to be relatively movable along the tubular axis direction. Further, since the seal member 43b of the intermediate sheath 40 slides on the second flat inner surface portion 34, its relative movement is guided. The other end 46 of the intermediate sheath 40 is inserted to a position corresponding to the inner end portion of the second flat inner surface portion 34. At this time, the pressing end surface 42a of the nut 42 is on the facing surface 2a side of the back end surface 3a of the work space 3, and the restriction on intrusion by the holding means 60 is released. Here, since the intermediate sheath 40 is restricted from being further inserted by the other end 46 hitting the stopper portion 38, it is prevented that the intermediate sheath 40 excessively enters the inside of the second sheath 30. The installation of the stopper portion 38 on the second sheath 30 side can be omitted if necessary.

つぎに、図2に示すように、中間シース40の一端45を、第1シース20内に挿入する。この挿入は、作業用空間3内に作業者が手や工具等を入れて、中間シース40を図中の矢印のように、第1シース20側へ引っ張ることにより可能である。第1のコンクリート部材1と第2のコンクリート部材2との間には、このような作業者が手や工具等を入れることができる空間が確保されている。このとき、第1平坦内面部24は、全周に亘って筒軸に平行な母線を有する円筒面で構成されているので、第1シース20と中間シース40との筒軸方向への相対移動がスムーズである。すなわち、第1平坦内面部24は、第1シース20と中間シース40とを筒軸方向に沿って相対移動可能に保持している。また、第1平坦内面部24には中間シース40のシール部材43aが摺動するので、その相対移動が案内されている。中間シース40の一端45は、第1平坦内面部24の奥部のストッパ部25に当接する位置まで挿入される。ストッパ部25が中間シース40の筒軸方向への位置決めを行うので、作業が容易である。 Next, as shown in FIG. 2, one end 45 of the intermediate sheath 40 is inserted into the first sheath 20. This insertion is possible by a worker inserting a hand, a tool, or the like into the work space 3 and pulling the intermediate sheath 40 toward the first sheath 20 as shown by an arrow in the drawing. A space is secured between the first concrete member 1 and the second concrete member 2 so that such a worker can put his / her hand, a tool, or the like. At this time, since the first flat inner surface portion 24 is composed of a cylindrical surface having a bus line parallel to the cylinder axis over the entire circumference, the first sheath 20 and the intermediate sheath 40 move relative to each other in the cylinder axis direction. Is smooth. That is, the first flat inner surface portion 24 holds the first sheath 20 and the intermediate sheath 40 so as to be relatively movable along the tubular axis direction. Further, since the seal member 43a of the intermediate sheath 40 slides on the first flat inner surface portion 24, its relative movement is guided. One end 45 of the intermediate sheath 40 is inserted to a position where it abuts on the stopper portion 25 at the inner portion of the first flat inner surface portion 24. Since the stopper portion 25 positions the intermediate sheath 40 in the tubular axis direction, the work is easy.

そして、図3に示すように、ナット42を筒軸回りに回転させて第2シース30側へ移動させる。ナット42の押圧端面42aが、作業用空間3の奥端面3aに当接すれば、中間シース40はそれ以上第2シース30側へは移動できない状態となる。これにより、保持手段60による中間シース40の第2シース30内への侵入の規制が行われる。これにより、中間シース40は、ストッパ部25により第1シース20側へのそれ以上の侵入が規制された状態であり、また、保持手段60により、第2シース30側への移動が規制された状態となる。このため、中間シース40は、第1シース20と第2シース30のそれぞれにしっかりと固定された状態となる。ナット42の押圧端面42aが奥端面3aに当接するまでナット42を回せばよいので、締め付け不足や締め付け過ぎが生じにくく、その作業が容易である。 Then, as shown in FIG. 3, the nut 42 is rotated around the cylinder axis and moved to the second sheath 30 side. When the pressing end surface 42a of the nut 42 comes into contact with the back end surface 3a of the working space 3, the intermediate sheath 40 is in a state where it cannot move further to the second sheath 30 side. As a result, the holding means 60 regulates the invasion of the intermediate sheath 40 into the second sheath 30. As a result, the intermediate sheath 40 is in a state in which further intrusion into the first sheath 20 side is restricted by the stopper portion 25, and movement to the second sheath 30 side is restricted by the holding means 60. It becomes a state. Therefore, the intermediate sheath 40 is firmly fixed to each of the first sheath 20 and the second sheath 30. Since the nut 42 may be turned until the pressing end surface 42a of the nut 42 comes into contact with the back end surface 3a, undertightening or overtightening is unlikely to occur, and the work is easy.

このように、中間シース40を介して第1シース20と第2シース30とを接続した後、その内部にPC鋼材を挿通してプレストレスを導入する。プレストレスの導入は、第1のコンクリート部材1と第2のコンクリート部材2に反力を取って、PC鋼材を引っ張る(緊張する)ことにより行うことができる。PC鋼材を緊張状態に固定した後、シースの内部にモルタル等の充填材を流し込んで、充填材を硬化させることでPC鋼材とコンクリートCとの付着力を高め、第1のコンクリート部材1と第2のコンクリート部材2を一体化する。このとき、第1平坦内面部24には中間シース40のシール部材43aが、第2平坦内面部34には中間シース40のシール部材43bがそれぞれ密着しているので、充填材の漏出を抑えることができる。 In this way, after connecting the first sheath 20 and the second sheath 30 via the intermediate sheath 40, a PC steel material is inserted therein to introduce prestress. The introduction of prestress can be performed by applying a reaction force to the first concrete member 1 and the second concrete member 2 and pulling (tensioning) the PC steel material. After fixing the PC steel material in a tense state, a filler such as mortar is poured into the sheath to harden the filler, thereby increasing the adhesive force between the PC steel material and the concrete C, and the first concrete member 1 and the first. The concrete member 2 of 2 is integrated. At this time, since the seal member 43a of the intermediate sheath 40 is in close contact with the first flat inner surface portion 24 and the seal member 43b of the intermediate sheath 40 is in close contact with the second flat inner surface portion 34, leakage of the filler is suppressed. Can be done.

なお、図4及び図5に示す変形例のように、操作手段50を用いることもできる。図4における操作手段50は、中間シース40を図中の矢印のように、第1シース20側へ引っ張るための引張り手段51である。引張り手段51には、樹脂や金属などからなる紐状部材、ワイヤ、帯状部材その他変形可能な素材からなる長手状部材を採用することができる。図5における操作手段50は、ナット42を筒軸回りに回転させる引張り手段52である。ナット42を筒軸回りに回転させることで、ナット42を第2シース30側へ移動させることができる。引張り手段52には、樹脂や金属などからなる紐状部材、ワイヤ、帯状部材、その他変形可能な素材からなる長手状部材を採用することができる。作業用空間3内に作業者が手や工具等を入れることができない場合は、このような操作手段50が有効である。特に、図4及び図5に示すように、作業用空間3の側面3bが中間シース40の外面に接近している場合に便利である。 It should be noted that the operating means 50 can also be used as in the modified examples shown in FIGS. 4 and 5. The operating means 50 in FIG. 4 is a pulling means 51 for pulling the intermediate sheath 40 toward the first sheath 20 as shown by an arrow in the figure. As the pulling means 51, a string-shaped member made of resin, metal, or the like, a wire, a strip-shaped member, or a longitudinal member made of a deformable material can be adopted. The operating means 50 in FIG. 5 is a pulling means 52 that rotates the nut 42 around the cylinder axis. By rotating the nut 42 around the cylinder axis, the nut 42 can be moved to the second sheath 30 side. As the pulling means 52, a string-shaped member made of resin, metal, or the like, a wire, a strip-shaped member, or a longitudinal member made of a deformable material can be adopted. When the worker cannot put a hand, a tool, or the like in the work space 3, such an operation means 50 is effective. In particular, as shown in FIGS. 4 and 5, it is convenient when the side surface 3b of the working space 3 is close to the outer surface of the intermediate sheath 40.

この発明の第2の実施形態を、図6及び図7に示す。以下、この実施形態を、第1の実施形態との相違点を中心に説明する。 A second embodiment of the present invention is shown in FIGS. 6 and 7. Hereinafter, this embodiment will be described focusing on the differences from the first embodiment.

第1シース20は、図6に示すように、第1平坦内面部24と、その第1平坦内面部24の奥側の端部に設けられるストッパ部25とを備えている。第1平坦内面部24は、断面拡大部22を構成する樹脂の内面で構成されているが、これを第1の実施形態と同様に、金属製又は硬質樹脂製の筒状部材23の内面で構成してもよい。第2シース30は、一般部31と、その一般部31の開口側の端部に接続される延長筒部37で構成している。一般部31の外面及び延長筒部37の内面にはそれぞれ螺旋状のリブ31a,37aが形成されているので、そのリブ31a,37aをねじ部として、延長筒部37は一般部31の開口側の端部の外周にねじ結合されている。延長筒部37は、樹脂の成型品である。 As shown in FIG. 6, the first sheath 20 includes a first flat inner surface portion 24 and a stopper portion 25 provided at an end portion on the inner side of the first flat inner surface portion 24. The first flat inner surface portion 24 is composed of the inner surface of the resin constituting the cross-section enlarged portion 22, which is the inner surface of the tubular member 23 made of metal or hard resin, as in the first embodiment. It may be configured. The second sheath 30 is composed of a general portion 31 and an extension cylinder portion 37 connected to an end portion of the general portion 31 on the opening side. Since spiral ribs 31a and 37a are formed on the outer surface of the general portion 31 and the inner surface of the extension cylinder portion 37, respectively, the ribs 31a and 37a are used as screw portions, and the extension cylinder portion 37 is on the opening side of the general portion 31. It is screwed to the outer circumference of the end of the. The extension cylinder portion 37 is a molded product of resin.

中間シース40は、第2シース30に接続される筒状の本体部41と、本体部41に接続される筒状の延長部48とを備えている。本体部41は、一端側に設けられた断面拡大部47bと、その断面拡大部47bの他端に接続されて、断面拡大部47bの内面よりも小断面の内面を有する一般部47aとを備えている。断面拡大部47bの内面に、筒軸を通る任意の縦断面で筒軸に平行であり、本体部41と延長部48とを筒軸方向に沿って相対移動可能に保持する中間平坦内面部44を備えている。中間平坦内面部44は、断面拡大部47bを構成する樹脂の内面で構成されているが、これを第1の実施形態と同様に、金属製又は硬質樹脂製の筒状部材の内面で構成してもよい。 The intermediate sheath 40 includes a tubular main body 41 connected to the second sheath 30 and a tubular extension 48 connected to the main body 41. The main body portion 41 includes a cross-section enlarged portion 47b provided on one end side, and a general portion 47a connected to the other end of the cross-section enlarged portion 47b and having an inner surface having a smaller cross section than the inner surface of the cross-section enlarged portion 47b. ing. An intermediate flat inner surface portion 44 that is parallel to the cylinder axis in an arbitrary vertical cross section passing through the cylinder axis and holds the main body portion 41 and the extension portion 48 so as to be relatively movable along the cylinder axis direction on the inner surface of the cross-section enlarged portion 47b. It is equipped with. The intermediate flat inner surface portion 44 is composed of the inner surface of the resin constituting the cross-section enlarged portion 47b, which is composed of the inner surface of a tubular member made of metal or hard resin as in the first embodiment. You may.

まず、図6に示すように、中間シース40の他端46を、第2シース30内に挿入する。この挿入は、延長筒部37のリブ(ねじ部)37aを雌ねじとし、中間シース40の本体部41のリブ(ねじ部)41aを雄ねじとして、延長筒部37の開口側の端部の内周に中間シース40をねじ込んでいくことで行うことができる。このとき、中間平坦内面部44は、全周に亘って筒軸に平行な母線を有する円筒面で構成されているので、本体部41と延長部48との接続範囲(重複範囲)が筒軸方向に長くなって、その接続がより確実である。また、中間平坦内面部44は、本体部41と延長部48とを筒軸方向に沿って相対移動可能に保持しているので、その抜き差しが容易である。また、中間平坦内面部44には延長部48の外周全周に設けたOリング48aが摺接するので、その相対移動が案内されている。 First, as shown in FIG. 6, the other end 46 of the intermediate sheath 40 is inserted into the second sheath 30. In this insertion, the rib (screw portion) 37a of the extension cylinder portion 37 is a female screw, and the rib (thread portion) 41a of the main body portion 41 of the intermediate sheath 40 is a male screw, and the inner circumference of the end portion on the opening side of the extension cylinder portion 37 is used. This can be done by screwing the intermediate sheath 40 into the screw. At this time, since the intermediate flat inner surface portion 44 is composed of a cylindrical surface having a bus line parallel to the cylinder axis over the entire circumference, the connection range (overlapping range) between the main body portion 41 and the extension portion 48 is the cylinder shaft. The longer in the direction, the more secure the connection. Further, since the intermediate flat inner surface portion 44 holds the main body portion 41 and the extension portion 48 so as to be relatively movable along the cylinder axis direction, it is easy to insert and remove them. Further, since the O-ring 48a provided on the entire outer circumference of the extension portion 48 is in sliding contact with the intermediate flat inner surface portion 44, its relative movement is guided.

つぎに、図7に示すように、中間シース40の一端45を、第1シース20内に挿入する。この挿入は、同じく、中間シース40を筒軸回りに回転させて、本体部41と延長部48とを第1シース20側へ移動させることにより可能である。第2シース30の延長筒部37と、中間シース40の本体部41とは、ねじ部37a,41a同士のねじ結合によって筒軸方向へ相対移動可能であるが、延長筒部37と本体部41とを筒軸方向へ相反する方向へ引っ張っても、対向する方向へ押し込んでも、両者は相対移動できない。このため、ねじ部37a,41a同士のねじ結合が、保持手段60として機能している。 Next, as shown in FIG. 7, one end 45 of the intermediate sheath 40 is inserted into the first sheath 20. This insertion is also possible by rotating the intermediate sheath 40 around the cylinder axis and moving the main body portion 41 and the extension portion 48 toward the first sheath 20 side. The extension cylinder portion 37 of the second sheath 30 and the main body portion 41 of the intermediate sheath 40 can move relative to each other in the tubular axial direction by screw coupling between the screw portions 37a and 41a, but the extension cylinder portion 37 and the main body portion 41 Even if they are pulled in opposite directions in the tubular axis direction or pushed in opposite directions, they cannot move relative to each other. Therefore, the screw connection between the screw portions 37a and 41a functions as the holding means 60.

また、第1平坦内面部24は、全周に亘って筒軸に平行な母線を有する円筒面で構成されているので、第1シース20と延長部48との筒軸方向への相対移動がスムーズである。すなわち、第1平坦内面部24は、第1シース20と中間シース40の延長部48とを筒軸方向に沿って相対移動可能に保持している。また、第1平坦内面部24には延長部48のOリング48aが摺接するので、その相対移動が案内されている。中間シース40の一端45は、第1平坦内面部24の奥部のストッパ部25に当接する位置まで挿入される。ストッパ部25が中間シース40の筒軸方向への位置決めを行うので、作業が容易である。これにより、中間シース40は、ストッパ部25により第1シース20側へのそれ以上の侵入が規制された状態であり、また、保持手段60により、第2シース30側への移動が規制された状態となる。このため、中間シース40は、第1シース20と第2シース30のそれぞれにしっかりと固定された状態となる。さらに、中間シース40の一端45、すなわち延長部48の一端45がストッパ部25に当接し、延長部48の他端48bが奥端面49に当接するまで中間シース40の本体部41を回せばよいので、締め付け不足や締め付け過ぎが生じにくく、その作業が容易である。 Further, since the first flat inner surface portion 24 is composed of a cylindrical surface having a bus line parallel to the cylinder axis over the entire circumference, the relative movement of the first sheath 20 and the extension portion 48 in the cylinder axis direction can occur. It's smooth. That is, the first flat inner surface portion 24 holds the first sheath 20 and the extension portion 48 of the intermediate sheath 40 so as to be relatively movable along the tubular axis direction. Further, since the O-ring 48a of the extension portion 48 is in sliding contact with the first flat inner surface portion 24, its relative movement is guided. One end 45 of the intermediate sheath 40 is inserted to a position where it abuts on the stopper portion 25 at the inner portion of the first flat inner surface portion 24. Since the stopper portion 25 positions the intermediate sheath 40 in the tubular axis direction, the work is easy. As a result, the intermediate sheath 40 is in a state in which further intrusion into the first sheath 20 side is restricted by the stopper portion 25, and movement to the second sheath 30 side is restricted by the holding means 60. It becomes a state. Therefore, the intermediate sheath 40 is firmly fixed to each of the first sheath 20 and the second sheath 30. Further, the main body 41 of the intermediate sheath 40 may be rotated until one end 45 of the intermediate sheath 40, that is, one end 45 of the extension portion 48 abuts on the stopper portion 25, and the other end 48b of the extension portion 48 abuts on the back end surface 49. Therefore, under-tightening and over-tightening are unlikely to occur, and the work is easy.

中間シース40を介して第1シース20と第2シース30とを接続した後、その内部にPC鋼材を挿通してプレストレスを導入する。さらに、シースの内部にモルタル等の充填材を流し込んで、充填材を硬化させる。このとき、第1平坦内面部24には中間シース40の延長部48のOリング48aが、中間平坦内面部44にも延長部48のOリング48aがそれぞれ密着しているので、充填材の漏出を抑えることができる。なお、このOリング48aに代えて、樹脂やゴム、不織布、フェルト等のシール部材を採用でき、さらにそのシール部材の素材として、前述の実施形態と同様に、水分を含むことによりその体積が膨張する水膨張性能を有している素材(例えば、水膨張性能を有する不織布シール材)を採用することができる。 After connecting the first sheath 20 and the second sheath 30 via the intermediate sheath 40, a PC steel material is inserted therein to introduce prestress. Further, a filler such as mortar is poured into the sheath to cure the filler. At this time, the O-ring 48a of the extension portion 48 of the intermediate sheath 40 is in close contact with the first flat inner surface portion 24, and the O-ring 48a of the extension portion 48 is in close contact with the intermediate flat inner surface portion 44, so that the filler leaks. Can be suppressed. In addition, instead of this O-ring 48a, a sealing member such as resin, rubber, non-woven fabric, or felt can be adopted, and as the material of the sealing member, the volume expands by containing water as in the above-described embodiment. A material having water expansion performance (for example, a non-woven fabric sealing material having water expansion performance) can be adopted.

なお、上記の第2の実施形態において、延長筒部37を用いずに、第2シース30を全長に亘って一般部31としてもよい。このとき、一般部31が作業用空間3の奥端面3aに開口し、その一般部31の内部に中間シース40がねじ結合される形態となる。この第2の実施形態において、第1の実施形態で用いた操作手段50を用いることもできる。 In the second embodiment described above, the second sheath 30 may be the general portion 31 over the entire length without using the extension cylinder portion 37. At this time, the general portion 31 opens in the inner end surface 3a of the work space 3, and the intermediate sheath 40 is screwed to the inside of the general portion 31. In this second embodiment, the operating means 50 used in the first embodiment can also be used.

1 第1のコンクリート部材
2 第2のコンクリート部材
10 シースの接続構造
20 第1シース
21 一般部
22 断面拡大部
24 第1平坦内面部
25 ストッパ部
30 第2シース
31 一般部
34 第2平坦内面部
37a ねじ部
40 中間シース
41 本体部
41a ねじ部
43a,43b シール部材
44 中間平坦内面部
48 延長部
50 操作手段
60 保持手段
1 1st concrete member 2 2nd concrete member 10 Sheath connection structure 20 1st sheath 21 General part 22 Cross-section expansion part 24 1st flat inner surface part 25 Stopper part 30 2nd sheath 31 General part 34 2nd flat inner surface part 37a Threaded part 40 Intermediate sheath 41 Main body 41a Threaded part 43a, 43b Sealing member 44 Intermediate flat inner surface 48 Extension 50 Operating means 60 Holding means

Claims (8)

第1のコンクリート部材(1)に埋設される筒状の第1シース(20)と、
第2のコンクリート部材(2)に埋設される筒状の第2シース(30)と、
前記第1シース(20)及び前記第2シース(30)を接続する筒状の中間シース(40)と、
前記第1シース(20)の内面に設けられ、筒軸を通る任意の縦断面で筒軸に平行であり、前記第1シース(20)と前記中間シース(40)とを筒軸方向に沿って相対移動可能に保持する第1平坦内面部(24)と、
前記第1平坦内面部(24)の奥側の端部に設けられ前記中間シース(40)の侵入を規制するストッパ部(25)と、
前記中間シース(40)が前記ストッパ部(25)により侵入を規制された状態で、前記第2シース(30)側への前記中間シース(40)の移動を規制する保持手段(60)と、
を備えているシースの接続構造。
A cylindrical first sheath (20) embedded in the first concrete member (1), and
A cylindrical second sheath (30) embedded in the second concrete member (2), and
A cylindrical intermediate sheath (40) connecting the first sheath (20) and the second sheath (30),
It is provided on the inner surface of the first sheath (20) and is parallel to the cylinder axis in an arbitrary vertical cross section passing through the cylinder axis, and the first sheath (20) and the intermediate sheath (40) are aligned along the cylinder axis direction. The first flat inner surface portion (24) that is held so as to be relatively movable,
A stopper portion (25) provided at the inner end of the first flat inner surface portion (24) and restricting the intrusion of the intermediate sheath (40), and a stopper portion (25).
A holding means (60) for restricting the movement of the intermediate sheath (40) to the second sheath (30) side in a state where the intermediate sheath (40) is restricted from entering by the stopper portion (25).
The sheath connection structure is equipped with.
前記第1シース(20)は、その内面が前記第1平坦内面部(24)を形成する筒状部材(23)と、前記筒状部材(23)を外側から保持する断面拡大部(22)と、前記断面拡大部(22)に接続され前記断面拡大部(22)の内面よりも小断面の内面を有する一般部(21)と、を備え、
前記ストッパ部(25)は、前記断面拡大部(22)の内面と前記一般部(21)の内面との間に設けられた段部又はテーパ部である請求項1に記載のシースの接続構造。
The first sheath (20) has a tubular member (23) whose inner surface forms the first flat inner surface portion (24) and a cross-sectional enlarged portion (22) that holds the tubular member (23) from the outside. And a general portion (21) connected to the cross-section enlarged portion (22) and having an inner surface having a smaller cross section than the inner surface of the cross-section enlarged portion (22).
The sheath connection structure according to claim 1, wherein the stopper portion (25) is a stepped portion or a tapered portion provided between the inner surface of the cross-sectional enlarged portion (22) and the inner surface of the general portion (21). ..
前記第2シース(30)の内面に、筒軸を通る任意の縦断面で筒軸に平行であり、前記保持手段(60)による前記中間シース(40)の侵入の規制が解除された状態で、前記第2シース(30)と前記中間シース(40)とを筒軸方向に沿って相対移動可能に保持する第2平坦内面部(34)を備えている請求項1又は2に記載のシースの接続構造。 In a state where the inner surface of the second sheath (30) is parallel to the cylinder axis in an arbitrary vertical cross section passing through the cylinder axis, and the restriction on the intrusion of the intermediate sheath (40) by the holding means (60) is released. The sheath according to claim 1 or 2, further comprising a second flat inner surface portion (34) that holds the second sheath (30) and the intermediate sheath (40) so as to be relatively movable along the tubular axis direction. Connection structure. 前記中間シース(40)の外面に、前記第1平坦内面部(24)及び前記第2平坦内面部(34)にそれぞれ摺接するシール部材(43a,43b)を備えている請求項3に記載のシースの接続構造。 The third aspect of the present invention, wherein the outer surface of the intermediate sheath (40) is provided with a sealing member (43a, 43b) that is in sliding contact with the first flat inner surface portion (24) and the second flat inner surface portion (34), respectively. Sheath connection structure. 前記シール部材(43a,43b)は、水膨張性能を有している素材である請求項4に記載のシースの接続構造。 The sheath connection structure according to claim 4, wherein the sealing member (43a, 43b) is a material having water expansion performance. 前記保持手段(60)は、前記中間シース(40)の外周にねじ結合されて筒軸回りに回転させることで前記中間シース(40)に対して筒軸方向へ相対移動するナット(42)を備えている請求項1から5のいずれか一つに記載のシースの接続構造。 The holding means (60) screw-couples the nut (42) to the outer periphery of the intermediate sheath (40) and rotates it around the cylinder axis to move the nut (42) relative to the intermediate sheath (40) in the tubular axis direction. The sheath connection structure according to any one of claims 1 to 5. 前記保持手段(60)は、前記第2シース(30)と前記中間シース(40)とを筒軸方向へ相対移動可能にねじ結合するねじ部(37a,41a)を備えている請求項1又は2に記載のシースの接続構造。 1. 2. The sheath connection structure according to 2. 前記中間シース(40)は、前記第2シース(30)に接続される筒状の本体部(41)と、前記本体部(41)に接続される筒状の延長部(48)とを備え、
前記本体部(41)の内面に、筒軸を通る任意の縦断面で筒軸に平行であり、前記本体部(41)と前記延長部(48)とを筒軸方向に沿って相対移動可能に保持する中間平坦内面部(44)を備えている請求項1又は2に記載のシースの接続構造。
The intermediate sheath (40) includes a tubular main body portion (41) connected to the second sheath (30) and a tubular extension portion (48) connected to the main body portion (41). ,
The inner surface of the main body (41) is parallel to the cylinder axis in an arbitrary vertical cross section passing through the cylinder axis, and the main body portion (41) and the extension portion (48) can be relatively moved along the cylinder axis direction. The connection structure of the sheath according to claim 1 or 2, which comprises an intermediate flat inner surface portion (44) to be held on the surface.
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