JP7424623B2 - bayonet fitting - Google Patents

bayonet fitting Download PDF

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JP7424623B2
JP7424623B2 JP2020076548A JP2020076548A JP7424623B2 JP 7424623 B2 JP7424623 B2 JP 7424623B2 JP 2020076548 A JP2020076548 A JP 2020076548A JP 2020076548 A JP2020076548 A JP 2020076548A JP 7424623 B2 JP7424623 B2 JP 7424623B2
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square tube
square
displacement plate
locking
rectangular
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JP2021173314A (en
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剛 寺阪
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Kyowa Rubber KK
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Kyowa Rubber KK
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  • Laying Of Electric Cables Or Lines Outside (AREA)
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Description

この発明は、合成樹脂製の角型のケーブル保護管をハンドホールに接続する際に好適に用いられるような差し込み継手に関する。 The present invention relates to a plug-in joint that is suitably used when connecting a square cable protection tube made of synthetic resin to a hand hole.

角型のケーブル保護管は、断面形状円形の円形部と断面形状角形の角形部が交互に連続形成されたものである。角型構造を有するので、角型のケーブル保護管は高い外圧強度を有し、多条敷設の際に位置安定性が良い。このため敷設に際して円筒管の場合のような管台は不要となり、コンパクトに多条管路を形成することができる。 The rectangular cable protection tube is formed by alternately and continuously forming circular parts with a circular cross-section and square parts with a rectangular cross-section. Since it has a rectangular structure, the rectangular cable protection tube has high external pressure strength and has good positional stability when laying multiple strips. Therefore, when installing the pipe, there is no need for a nozzle stand as in the case of a cylindrical pipe, and a multi-line pipe can be formed in a compact manner.

多条敷設される角型ケーブル保護管をハンドホールに接続する際には、下記特許文献１に開示されている管接続具が用いられる。 When connecting a rectangular cable protection tube laid in multiple strips to a hand hole, a tube connector disclosed in Patent Document 1 below is used.

この管接続具は、ハンドホールに設けられた設置孔と略同一の外径を有するコンクリート基部と、コンクリート基部内に一部が埋設される複数の筒状体で構成されている。筒状体は、コンクリート基部に埋設される埋設部と、ケーブル保護管の端部が差し込まれる管接続口を同一軸線上に有している。 This pipe connector is comprised of a concrete base having approximately the same outer diameter as the installation hole provided in the hand hole, and a plurality of cylindrical bodies partially buried within the concrete base. The cylindrical body has a buried part buried in the concrete base and a pipe connection port into which the end of the cable protection tube is inserted on the same axis.

複数の筒状体の埋設部は、コンクリート基部に対して、縦横に並べられた状態で固定されている。また管接続口は、角型のケーブル保護管における角形部が嵌る断面略四角形状である。 The buried portions of the plurality of cylindrical bodies are fixed to the concrete base in a state in which they are arranged vertically and horizontally. Further, the tube connection port has a substantially square cross section into which the square portion of the square cable protection tube fits.

このような管接続具は、工場で製造されて現場に搬入され、設置したハンドホールの側壁にあらかじめ形成された設置孔に嵌めたのち、設置孔とコンクリート基部との間にモルタル等の充填材を充填して固定される。 Such pipe fittings are manufactured in a factory and delivered to the site, and are fitted into a pre-formed installation hole in the side wall of the installed hand hole, and then a filling material such as mortar is placed between the installation hole and the concrete base. is filled and fixed.

しかし、管接続具は筒状体の一部を型枠に入れてからコンクリートを流し込んで製造されるので、製造するのに時間がかかる。しかもコンクリート基部は重いので運搬とハンドホールに対する固定は容易ではない。 However, since pipe fittings are manufactured by placing a portion of the cylindrical body in a form and then pouring concrete, it takes time to manufacture. Moreover, since the concrete base is heavy, it is not easy to transport and fix it to the handhole.

この点、円筒管をハンドホールに接続するための管継手であるが、下記特許文献２に開示されたものがある。この管継手は、受け継手の基端をハンドホールの側壁に形成された丸穴に挿入したのち、丸穴の周囲をベルマウスと締め付け部材で内外に挟みつけて容易に固定する構造である。 In this regard, a pipe joint for connecting a cylindrical pipe to a hand hole is disclosed in Patent Document 2 below. This pipe joint has a structure in which the proximal end of the joint is inserted into a round hole formed in the side wall of the hand hole, and then the round hole is easily fixed by sandwiching the round hole inside and outside with a bell mouth and a tightening member.

また、特許文献１の筒状体の管接続口に対してケーブル保護管の差し込み端部を接続する際には、ケーブル保護管の差し込み端部の外周面に別体の抜止部材を嵌合させてから管接続口に差し込む必要がある。このため、抜止部材を現場で嵌合する手間が必要であり、作業性は良くない。 Furthermore, when connecting the insertion end of the cable protection tube to the pipe connection port of the cylindrical body of Patent Document 1, a separate retaining member is fitted to the outer peripheral surface of the insertion end of the cable protection tube. After that, you need to insert it into the pipe connection port. For this reason, it is necessary to take the effort to fit the retaining member on-site, and the workability is not good.

この点、下記特許文献３には、ケーブル保護管を差し込むだけで接続できる接続雌部構造が開示されている。接続雌部構造は、ケーブル保護管の端部が挿入される角筒状部の開口部側の内面に抜け止め部材を有している。この抜け止め部材は、角筒状部とは別体の板バネで構成されている。 In this regard, Patent Document 3 listed below discloses a connection female part structure that can be connected simply by inserting a cable protection tube. The connection female part structure has a retaining member on the inner surface of the opening side of the rectangular tubular part into which the end of the cable protection tube is inserted. This retaining member is composed of a leaf spring separate from the rectangular tubular portion.

抜け止め部材を備えているので、特許文献３の構造では、現場においてはケーブル保護管を差し込むだけで接続ができる。しかも、角筒状部の開口部とは反対側の内面には吸水膨張布が貼着されているので、埋め戻したときに吸水膨張布が膨張して、水の侵入を阻止できる。 Since a retaining member is provided, the structure of Patent Document 3 allows connection at the site simply by inserting the cable protection tube. Furthermore, since the water-absorbing and expanding fabric is adhered to the inner surface of the rectangular tubular portion on the opposite side from the opening, the water-absorbing and expanding fabric expands when it is backfilled, thereby preventing water from entering.

しかしながら、特許文献３の構造は別体の板バネからなる抜け止め部材を角筒状部に対して固定する必要があるので、製造において手間がかかる。 However, in the structure of Patent Document 3, it is necessary to fix the retaining member made of a separate leaf spring to the rectangular tubular part, which takes time and effort in manufacturing.

特許第５０８５９４４号公報Patent No. 5085944 特許第４９６１１７４号公報Patent No. 4961174 特許第５１８３２８１号公報Patent No. 5183281

この発明は、例えば多条敷設される角型のケーブル保護管をハンドホールに接続するための構成が、コンクリートの打設なしに容易に製造でき、接続作業も容易であるようにすることを主な目的とする。 The main object of this invention is to enable a structure for connecting, for example, a rectangular cable protection pipe laid in multiple strips to a hand hole, to be easily manufactured without pouring concrete, and to facilitate the connection work. purpose.

そのための手段は、断面形状円形の円形部と断面形状角形の角形部を長手方向に交互に有する角型管の端部が差し込まれる角筒部と、前記角筒部に一体形成されて受け継手に差し込まれる円筒部を有する差し込み継手であって、前記角筒部が、少なくとも２個の前記角形部を挿入可能な長さに形成されるとともに、前記角筒部における差し込まれた前記角型管の前記円形部に対応する部位に、前記角筒部の入り口側の一部を除いた周囲に切り欠き溝を有し内外に弾性変位する変位板が一体形成され、前記変位板の内面に、内方へ突出する係止突起が幅方向に沿って複数並設され、前記係止突起における前記角筒部の入り口側の面に、奥ほど内方に傾く傾斜面が形成された差し込み継手である。 The means for this purpose includes a square tube part into which the end of a square tube is inserted, which has circular parts with a circular cross-section and square parts with a square cross-section alternately in the longitudinal direction, and a receiver formed integrally with the square tube part. An insertion joint having a cylindrical portion inserted into the rectangular tube, wherein the rectangular tube portion is formed to a length that allows insertion of at least two of the rectangular portions, and the rectangular tube inserted into the rectangular tube portion. A displacement plate is integrally formed in a portion corresponding to the circular portion of the rectangular tube portion, and has a cutout groove around the periphery of the rectangular tube portion except for a part on the entrance side, and is elastically displaced inward and outward, and on an inner surface of the displacement plate, A plug-in joint in which a plurality of locking protrusions projecting inward are arranged in parallel along the width direction, and an inclined surface that slopes inward toward the back is formed on a surface of the locking protrusions on the entrance side of the square tube part. be.

この構成では、角型管をハンドホール等に接続するのに際しては、角型管の差し込み端部を角筒部に差し込んで接続してから、円筒部を適宜の受け継手に接続する。円筒部を受け継手に接続したのち、角型管の差し込み端部を角筒部に接続してもよい。 In this configuration, when connecting the square tube to a hand hole or the like, the insertion end of the square tube is inserted into the square tube section and connected, and then the cylindrical section is connected to an appropriate joint. After connecting the cylindrical part to the handle, the insertion end of the square tube may be connected to the square tube part.

角型管の差し込み端部を角筒部に差し込むと、角型管の角形部に係止突起が押されて、変位板が外方に弾性変形し、先端の角形部が通過した時点で変位板が弾性復帰する。これによって、係止突起が円形部に嵌り、先端の角形部における反差し込み方向側の面に対して抜け止めを行う。 When the insertion end of the square tube is inserted into the square tube part, the locking protrusion is pressed against the square part of the square tube, the displacement plate is elastically deformed outward, and the displacement plate is displaced when the square part at the tip passes through. The plate returns elastically. As a result, the locking protrusion fits into the circular portion and prevents the protrusion from coming off against the surface of the square portion at the tip on the side opposite to the insertion direction.

変位板の幅方向に複数存在する係止突起は、幅広い範囲に抜け止め作用を発揮する。また、係止突起の傾斜面は、角型管の差し込みを容易にするとともに、係止突起の強度を高める。 A plurality of locking protrusions that exist in the width direction of the displacement plate exhibit a retaining effect over a wide range. Further, the inclined surface of the locking projection facilitates insertion of the square tube and increases the strength of the locking projection.

この発明によれば、円筒部を有し、円筒部を適宜の受け継手に差し込んで接続するので、コンクリートに埋設した継手を用いずとも多条敷設の角型管の接続が容易に行える。 According to this invention, since the pipe has a cylindrical part and is connected by inserting the cylindrical part into a suitable joint, it is possible to easily connect square pipes laid in multiple strips without using a joint buried in concrete.

また円筒部と一体の角筒部は、一体の変位板と係止突起を有しており、角型管を差し込むだけで接続できるので、現場での接続作業は容易である。 Furthermore, the rectangular cylindrical portion that is integrated with the cylindrical portion has an integral displacement plate and a locking protrusion, and can be connected by simply inserting the rectangular tube, so the connection work on site is easy.

角型管と差し込み継手の斜視図。A perspective view of a square pipe and a bayonet joint. 角型管をハンドホールに接続する概要を示す斜視図。The perspective view which shows the outline of connecting a square tube to a hand hole. 角型管のハンドホールへの接続状態を示す断面図。FIG. 3 is a cross-sectional view showing how the square tube is connected to the hand hole. 差し込み継手の本体部の各面と断面を表す図。A diagram showing each surface and cross section of the main body of the insertion joint. 角型管を差し込み継手に接続する際の動きを示す断面図。A cross-sectional view showing the movement when connecting a square pipe to a plug joint. 角型管を差し込み継手に接続した状態の一部断面側面図。FIG. 3 is a partially cross-sectional side view of the square pipe connected to the insertion joint. 差し込み継手を受け継手に接続する態様を示す正面図。The front view which shows the aspect which connects a insertion joint to a receiver. 他の例に係る差し込み継手の斜視図。FIG. 7 is a perspective view of a plug-in joint according to another example. 図８の差し込み継手における本体部の各面と断面を表す図。9 is a diagram showing each surface and cross section of the main body portion of the insertion joint of FIG. 8. FIG.

この発明を実施するための一形態を、以下図面を用いて説明する。 One embodiment of the present invention will be described below with reference to the drawings.

図１に、角型管１１と、角型管１１の差し込み先端部１１ａに装着される差し込み継手３１の斜視図を示す。 FIG. 1 shows a perspective view of the square tube 11 and the insertion joint 31 attached to the insertion tip 11a of the square tube 11.

角型管１１は、断面形状円形の円形部１２と断面形状角形の角形部１３を長手方向に沿って交互に有する構造であり、内部の空間１４にケーブルが挿通され収容される。円形部１２は角形部１３よりも小径である。また、角形部１３は正面視略長方形のものを図示したが、八角形に近い形状のものであってもよい。 The rectangular tube 11 has a structure in which circular portions 12 having a circular cross-section and square portions 13 having a rectangular cross-section are alternately arranged along the longitudinal direction, and a cable is inserted into an internal space 14 and accommodated therein. The circular portion 12 has a smaller diameter than the square portion 13. Further, although the square portion 13 is illustrated as being substantially rectangular when viewed from the front, it may have a shape close to an octagon.

差し込み継手３１は、図２に示したように角型管１１をハンドホール５１に接続するための構成の一部であり、角型管１１の差し込み先端部１１ａが差し込まれる角筒部３２と、角筒部３２に一体形成されて受け継手７１に差し込まれる円筒部３３を有している。すなわち、差し込み継手３１は、先端側の円筒部３３をハンドホール５１に固定された受け継手７１に対して接続され、これによって後端側の角筒部３２部に装着した角型管１１をハンドホール５１に接続する。 The insertion joint 31 is a part of the structure for connecting the square tube 11 to the hand hole 51 as shown in FIG. It has a cylindrical part 33 that is integrally formed with the square cylindrical part 32 and inserted into the handle 71. That is, the insertion joint 31 connects the cylindrical part 33 on the distal end side to the handle 71 fixed to the hand hole 51, thereby allowing the square tube 11 attached to the square cylindrical part 32 on the rear end side to be inserted into the hand. Connect to hole 51.

まず、受け継手７１の概略構造を説明する。受け継手７１は、図３に示したように、円筒状の本体部材７２と、ハンドホール５１の側壁５２の内面側に固定されるベルマウス７３と、外面側に固定される締め付け部材７４で構成されている。 First, the schematic structure of the handle 71 will be explained. As shown in FIG. 3, the handle 71 is composed of a cylindrical main body member 72, a bell mouth 73 fixed to the inner surface of the side wall 52 of the hand hole 51, and a tightening member 74 fixed to the outer surface. has been done.

本体部材７２は、ハンドホール５１の側壁５２の厚さよりも長く形成され、長手方向の基部側にねじ部７５が形成されている。ねじ部７５は内周面に雌ねじ７５ａを、外周面に雄ねじ７５ｂを有している。 The main body member 72 is formed longer than the thickness of the side wall 52 of the hand hole 51, and has a threaded portion 75 formed on the base side in the longitudinal direction. The threaded portion 75 has a female thread 75a on its inner peripheral surface and a male thread 75b on its outer peripheral surface.

他方、長手方向の遊端には、差し込み継手３１の円筒部３３が差し込まれる受け筒部７６が形成されている。受け筒部７６には長手方向の中間部における内周面に、拡径する方向に弾性変形する環状の係止リング７７が装着されている。 On the other hand, a receiving cylinder part 76 into which the cylindrical part 33 of the insertion joint 31 is inserted is formed at the free end in the longitudinal direction. An annular locking ring 77 that is elastically deformed in the direction of diameter expansion is attached to the inner circumferential surface of the receiving cylinder portion 76 at the intermediate portion in the longitudinal direction.

ベルマウス７３は、円環板状をなしハンドホール５１の側壁５２における内面に当接する当接面部７３ａと、当接面部７３ａの内周位置から当接面部７３ａに対して垂直に延びる円筒状部７３ｂを有している。当接面部７３ａにおける円筒状部７３ｂを有する側の面には、水分を吸収すると膨張する水膨張性シート７８が装着されている。円筒状部７３ｂの外周面には、本体部材７２のねじ部７５に形成された雌ねじ７５ａに螺合する雄ねじ７３ｃが形成されている。 The bell mouth 73 has an annular plate shape and a contact surface portion 73a that contacts the inner surface of the side wall 52 of the hand hole 51, and a cylindrical portion that extends perpendicularly to the contact surface portion 73a from the inner peripheral position of the contact surface portion 73a. 73b. A water-expandable sheet 78 that expands when it absorbs moisture is attached to the surface of the contact surface portion 73a on the side having the cylindrical portion 73b. A male thread 73c is formed on the outer circumferential surface of the cylindrical portion 73b, and is threaded into a female thread 75a formed in the threaded portion 75 of the main body member 72.

締め付け部材７４は、短円筒状であり、本体部材７２のねじ部７５の外周面に螺合する大きさである。つまり、内周面には本体部材７２のねじ部７５に形成された雄ねじ７５ｂに螺合する雌ねじ７４ａが形成されている。雌ねじ７４ａはその面に水膨張性シート７９を有している。また、一方の端面には、鍔状にわずかに広がりハンドホール５１の側壁５２における外面に当接する締め付け面７４ｂが形成されている。この締め付け面７４ｂは、ベルマウス７３の当接面部７３ａと同様に水膨張性シート７８を有している。 The tightening member 74 has a short cylindrical shape and is sized to be screwed onto the outer peripheral surface of the threaded portion 75 of the main body member 72 . That is, a female thread 74a is formed on the inner circumferential surface to be screwed into a male thread 75b formed in the threaded portion 75 of the main body member 72. The female thread 74a has a water-expandable sheet 79 on its surface. Furthermore, a tightening surface 74b that slightly expands like a brim and comes into contact with the outer surface of the side wall 52 of the hand hole 51 is formed on one end surface. This tightening surface 74b has a water-expandable sheet 78 similarly to the contact surface portion 73a of the bell mouth 73.

このような受け継手７１に接続される差し込み継手３１は、合成樹脂で一体成形された本体部３１ａと、本体部３１ａに取り付けられる水膨張性シート３４で構成される。本体部３１ａは、前述のように角筒部３２と円筒部３３を有し、円筒部３３の少なくとも先端側の部分は受け筒部７６に挿入嵌合可能な大きさの円筒状である。円筒部３３は先端部に、前述した受け継手７１の係止リング７７が係止する円環状の係止凹溝３５を有している。また係止凹溝３５よりも先端の外周面には、先端側ほど小径となるテーパ面３６が形成されている。 The insertion joint 31 connected to such a handle 71 is composed of a main body part 31a integrally molded from synthetic resin and a water-expandable sheet 34 attached to the main body part 31a. The main body portion 31a has the rectangular tube portion 32 and the cylindrical portion 33 as described above, and at least the distal end side portion of the cylindrical portion 33 is cylindrical in a size that can be inserted and fitted into the receiving tube portion 76. The cylindrical portion 33 has an annular locking recessed groove 35 at its tip, into which the locking ring 77 of the aforementioned handle 71 locks. Further, a tapered surface 36 is formed on the outer circumferential surface at the tip end of the locking groove 35, and the diameter becomes smaller toward the tip end.

図４に、差し込み継手３１の本体部３１ａの正面、平面、側面の各面と、断面（図４の（ｃ）におけるＡ－Ａ断面図）を示す。 FIG. 4 shows the front, plane, and side surfaces of the main body portion 31a of the insertion joint 31, as well as a cross section (AA cross-sectional view in FIG. 4(c)).

この図に示したように、差し込み継手３１の円筒部３３は、大径部３３ａと、大径部３３ａよりも若干小径の小径部３３ｂを有し、小径部３３ｂが受け継手７１の受け筒部７６に挿入される部分である。大径部３３ａと小径部３３ｂとの間には段差面３３ｃが形成されている。大径部３３ａを有する部分の内部は、差し込まれた角型管１１の円形部１２が入る部分である。大径部３３ａと小径部３３ｂとの間に相当する部分の内部には、角型管１１の円形部１２よりも小径となる内周方向に突出したリブ状の環状突部３３ｄが形成されている。 As shown in this figure, the cylindrical portion 33 of the insertion joint 31 has a large diameter portion 33a and a small diameter portion 33b that is slightly smaller in diameter than the large diameter portion 33a, and the small diameter portion 33b is the receiving cylinder portion of the handle 71. This is the part inserted into 76. A stepped surface 33c is formed between the large diameter portion 33a and the small diameter portion 33b. The inside of the portion having the large diameter portion 33a is a portion into which the circular portion 12 of the inserted rectangular tube 11 is inserted. A rib-shaped annular protrusion 33d that has a smaller diameter than the circular portion 12 of the square tube 11 and protrudes in the inner circumferential direction is formed inside a portion corresponding to the large diameter portion 33a and the small diameter portion 33b. There is.

差し込み継手３１の角筒部３２は、角型管１１の角形部１３が嵌る大きさの略断面四角形であり、隣接する少なくとも２個の角形部１３が挿入可能な長さに形成されている。角筒部３２は四隅にアール部３２ａを有している。 The rectangular tube portion 32 of the insertion joint 31 has a substantially rectangular cross section large enough to fit into the rectangular portion 13 of the rectangular tube 11, and is formed to have a length that allows insertion of at least two adjacent rectangular portions 13. The square tube portion 32 has rounded portions 32a at four corners.

角筒部３２における差し込まれた角型管１１の角形部１３間に位置する円形部１２に対応する部位、換言すれば、角筒部３２における軸方向の中間部に相当する部位には、切り欠き溝３７の形成により得られる変位板３８が設けられている。つまり、変位板３８は、角筒部３２の入り口側の一部を除いた周囲に厚み方向に貫通する切り欠き溝３７に囲まれて、角筒部３２に対して内外に弾性変位可能に一体形成されている。この例では、変位板３８は四角形であり、切り欠き溝３７は軸方向に延びる平行な２本の縦線部３７ａと縦線部３７ａの先端同士を連結する横線部３７ｂで構成されている。 A portion of the square tube portion 32 corresponding to the circular portion 12 located between the square portions 13 of the square tube 11 inserted, in other words, a portion corresponding to the axially intermediate portion of the square tube portion 32 is provided with a cut. A displacement plate 38 obtained by forming notch grooves 37 is provided. That is, the displacement plate 38 is surrounded by the notch groove 37 that penetrates in the thickness direction around the periphery of the square tube part 32 except for a part on the entrance side, and is integrally configured to be elastically displaceable in and out of the square tube part 32. It is formed. In this example, the displacement plate 38 is square, and the notch groove 37 is composed of two parallel vertical line parts 37a extending in the axial direction and a horizontal line part 37b connecting the tips of the vertical line parts 37a.

変位板３８が、角筒部３２の幅方向の中間位置に形成され、その幅方向の長さは、角筒部３２の幅方向における長さの３分の１より大きく平らである。具体的には、４隅にアール部３２ａを有しているので、アール部３２ａに近い位置に、前述した２本の縦線部３７ａが形成されている。 The displacement plate 38 is formed at an intermediate position in the width direction of the square tube portion 32, and its length in the width direction is larger than one-third of the length of the square tube portion 32 in the width direction and is flat. Specifically, since the four corners have rounded portions 32a, the two vertical line portions 37a described above are formed near the rounded portions 32a.

このような変位板３８は、角筒部３２の中心線（角筒部３２の中心の仮想の軸線）を挟んで一対設けられている。つまり、角筒部３２の断面形状が略四角形であるので、角筒部３２を横向きに置いたときに上下になる２面、または左右になる２面に形成されている。 A pair of such displacement plates 38 are provided with the center line of the square tube section 32 (imaginary axis of the center of the square tube section 32) interposed therebetween. That is, since the cross-sectional shape of the rectangular tube part 32 is substantially square, it is formed on two sides, which are the upper and lower sides, or two sides, which are the left and right sides when the rectangular tube part 32 is placed horizontally.

そして、変位板３８の内面には、内方へ突出する係止突起３９が幅方向に沿って複数並設されている。この例では、係止突起３９は変位板３８の幅方向の両側縁に一対形成されている。 On the inner surface of the displacement plate 38, a plurality of locking protrusions 39 that protrude inward are arranged in parallel along the width direction. In this example, a pair of locking protrusions 39 are formed on both sides of the displacement plate 38 in the width direction.

係止突起３９は三角形状であり、係止突起３９における角筒部３２の入り口側の面に、奥ほど内方に傾く傾斜面３９ａを有している。係止突起３９における角筒部３２の奥側の面は、垂直に切り立つ垂直面３９ｂであり、切り欠き溝３７の横線部３７ｂと面一である。 The locking projection 39 has a triangular shape, and has an inclined surface 39a on the surface of the locking projection 39 on the entrance side of the rectangular tube portion 32, which slopes inward toward the rear. The surface of the locking protrusion 39 on the back side of the rectangular tube portion 32 is a vertical surface 39b that stands vertically, and is flush with the horizontal line portion 37b of the notch groove 37.

また係止突起３９は、変位板３８における角筒部３２の長手方向の途中から先端側にかけて形成されている。換言すれば、係止突起３９の変位板３８に接する部分の長さは、切り欠き溝３７の縦線部３７ａよりも短い。なお、係止突起３９の高さや大きさは、接続する角型管１１の各部の大きさによって適宜設定される。 Further, the locking protrusion 39 is formed from halfway in the longitudinal direction of the rectangular tube portion 32 on the displacement plate 38 to the distal end side. In other words, the length of the portion of the locking protrusion 39 that contacts the displacement plate 38 is shorter than the vertical line portion 37a of the notch groove 37. Note that the height and size of the locking protrusion 39 are appropriately set depending on the size of each part of the square tube 11 to be connected.

前述した水膨張性シート３４は、水分を吸収すると膨張するものであり、例えば、水分を吸収して膨張する水膨張材を不織布内に含有させることで得られる。水膨張材としては、粉粒状のもの、シート状のもの、液状のものなどが適宜使用できるが、繊維状のものを用いると、不織布を構成する繊維との一体性が高まるのでよい。水膨張性シート３４は水膨張性の不織布以外のもので構成してもよい。 The water-swellable sheet 34 described above expands when it absorbs moisture, and can be obtained, for example, by incorporating a water-swellable material that expands by absorbing moisture into a nonwoven fabric. As the water-expanding material, powder-like materials, sheet-like materials, liquid materials, etc. can be used as appropriate, but it is preferable to use fibrous materials because they enhance the integrity with the fibers constituting the nonwoven fabric. The water-swellable sheet 34 may be made of something other than water-swellable nonwoven fabric.

この水膨張性シート３４は、本体部３１ａの角筒部３２の内面における切り欠き溝３７の横線部３７ｂに接する位置から奥側に備えられている。水膨張性シート３４の取付け位置は、四角筒状をなす内周面の全周であり、貼着などの適宜手段で取り付けられる。 This water-expandable sheet 34 is provided on the inner surface of the rectangular tube portion 32 of the main body portion 31a from a position in contact with the horizontal line portion 37b of the notch groove 37 on the back side. The water-swellable sheet 34 is attached to the entire circumference of the inner peripheral surface of the rectangular cylindrical shape, and is attached by an appropriate means such as adhesion.

以上のように構成された差し込み継手３１を用いて角型管１１をハンドホール１５に接続する作業は次のように行う。 The operation of connecting the square tube 11 to the hand hole 15 using the insertion joint 31 configured as described above is performed as follows.

まず、角型管１１の差し込み先端部１１ａを差し込み継手３１の角筒部３２に差し込んで接続する。その後、差し込み継手３１の円筒部３３をハンドホール５１の側壁５２に固定した受け継手７１に接続する。手順は逆にして、差し込み継手３１の円筒部３３を受け継手７１に接続したのち、角型管１１の差し込み先端部１１ａを角筒部３２に接続してもよい。 First, the insertion end portion 11a of the square tube 11 is inserted into the square tube portion 32 of the insertion joint 31 for connection. Thereafter, the cylindrical portion 33 of the insertion joint 31 is connected to the handle 71 fixed to the side wall 52 of the hand hole 51. The procedure may be reversed, and after connecting the cylindrical portion 33 of the insertion joint 31 to the handle 71, the insertion tip portion 11a of the square tube 11 may be connected to the square tube portion 32.

角型管１１は適宜位置の円形部１２において端部側を切除して、差し込み先端部１１ａが準備される。 The end portion of the square tube 11 is cut off at the circular portion 12 at an appropriate position to prepare the insertion tip portion 11a.

角型管１１の差し込み先端部１１ａを角筒部３２に差し込むと、角型管１１の角形部１３に係止突起３９が押されて、図５に仮想線で示したように、変位板３８が縦線部３７ａの入り口側の基端部を支点にして外方に弾性変形する。係止突起３９は傾斜面３９ａを有するので、角型管１１の差し込みは容易である。また、傾斜面３９ａを有することにより係止突起３９と変位板３８の一体化されている部位を長くすることができるので、係止突起３９の強度を高めることができる。 When the insertion tip 11a of the square tube 11 is inserted into the square tube section 32, the locking protrusion 39 is pushed against the square section 13 of the square tube 11, and the displacement plate 38 is pushed as shown by the imaginary line in FIG. is elastically deformed outward using the proximal end of the vertical line portion 37a on the entrance side as a fulcrum. Since the locking protrusion 39 has an inclined surface 39a, the rectangular tube 11 can be easily inserted. Further, by having the inclined surface 39a, the portion where the locking projection 39 and the displacement plate 38 are integrated can be lengthened, so that the strength of the locking projection 39 can be increased.

係止突起３９は変位板３８における角筒部３２の長手方向の途中から先端側にかけて形成されているので、変位板３８の変位は、係止突起３９を変位板３８の基部から先端側に形成する場合に比して、変形しやすくできる。このため、所望に応じて差し込み易さが得られる。 Since the locking protrusion 39 is formed from the midway in the longitudinal direction of the rectangular tube portion 32 on the displacement plate 38 to the tip side, the displacement of the displacement plate 38 is caused by forming the locking protrusion 39 from the base of the displacement plate 38 to the tip side. It can be easily deformed compared to the case where the This provides ease of insertion as desired.

差し込み先端部１１ａにおける先端の角形部１３が係止突起３９を通過すると、変位板３８は弾性復帰して係止突起３９を内方に突き立てる。これによって、係止突起３９が角型管１１の円形部１２に嵌り、先端の角形部１３の反差し込み方向側の面に対して抜け止めを行う。 When the square portion 13 at the tip of the insertion tip portion 11a passes the locking projection 39, the displacement plate 38 elastically returns to push the locking projection 39 inward. As a result, the locking protrusion 39 fits into the circular portion 12 of the square tube 11, and prevents it from coming off against the surface of the square portion 13 at the tip on the side opposite to the insertion direction.

図６は、角筒部３２に角型管１１の角形部１３を係止した状態を示す、角筒部３２の入り口側から見た断面図である。 FIG. 6 is a sectional view of the rectangular tube portion 32 viewed from the entrance side, showing a state in which the rectangular portion 13 of the rectangular tube 11 is locked to the rectangular tube portion 32.

この図に示すように、係止突起３９は変位板３８の幅方向の両側縁に存在するので、幅広い範囲に抜け止め作用を発揮する。また、変位板３８は角筒部３２の中心線を挟んで一対設けられているので、バランスよく抜け止めが行える。 As shown in this figure, since the locking protrusions 39 are present on both sides of the displacement plate 38 in the width direction, they exhibit a retaining effect over a wide range. Moreover, since a pair of displacement plates 38 are provided with the center line of the square tube part 32 interposed therebetween, the displacement plates 38 can be prevented from coming off in a well-balanced manner.

つぎに、図７に示したように、ハンドホール５１の側壁５２に形成された丸穴５３に固定された受け継手７１の受け筒部７６に対して、差し込み継手３１を挿し込む。多条敷設の場合、図２に示したように複数の受け継手７１がハンドホール５１の側壁５２に対して縦横に定間隔で並べて取り付けられる。受け継手７１の間隔は角型管１１を縦横に重ねられる間隔である。 Next, as shown in FIG. 7, the insertion joint 31 is inserted into the receiving cylinder portion 76 of the handle 71 fixed in the round hole 53 formed in the side wall 52 of the hand hole 51. In the case of multi-strip installation, a plurality of handles 71 are attached to the side wall 52 of the hand hole 51 at regular intervals vertically and horizontally, as shown in FIG. The spacing between the joints 71 is such that the square tubes 11 can be stacked vertically and horizontally.

これらの受け継手７１に対して複数本の角型管１１の差し込み継手３１を順次差し込むと、接続が完了する。受け継手７１に対する差し込み継手３１の接続においては、円筒部３３の先端部に、受け継手７１に設けられた係止リング７７が係止する円環状の係止凹溝３５を有した構成であるので、受け継手７１と差し込み継手３１の相対角度は適宜変更可能である。つまり、角型管１１が軸周りに傾いていても接続ができる。 When the insertion joints 31 of the plurality of rectangular tubes 11 are sequentially inserted into these joints 71, the connection is completed. When connecting the insertion joint 31 to the handle 71, the cylindrical portion 33 has an annular locking recessed groove 35 at the tip end thereof, into which a locking ring 77 provided on the handle 71 locks. , the relative angle between the handle 71 and the insertion joint 31 can be changed as appropriate. In other words, the connection can be made even if the square tube 11 is tilted around the axis.

複数の角型管１１をハンドホール５１に接続したのち埋め戻すと、地中の水分を受け継手７１の水膨張性シート７８、７９と同様に、差し込み継手３１の水膨張性シート３４も吸収して膨張する。膨張することによって、それぞれ対向部位との間で止水を行う。 When a plurality of rectangular pipes 11 are connected to the hand hole 51 and then backfilled, the water-swellable sheet 34 of the insertion joint 31 absorbs moisture in the ground, similar to the water-swellable sheets 78 and 79 of the handle 71. and expand. By expanding, water is stopped between each opposing part.

差し込み継手３１の水膨張性シート３４の場合には、図３に示したように、対向部位である角型管１１の円形部１２と角形部１３に密着して止水する。そしてこれと同時に、水膨張性シート３４は角筒部３２と円筒部３３の間の段差部３１ｂを支えにして角形部１３を角筒部３２の入り口側に後退させて、角形部１３と係止突起３９とを密着させる。つまり、止水が行えるうえに安定した固定状態が得られる。 In the case of the water-swellable sheet 34 of the insertion joint 31, as shown in FIG. 3, it comes into close contact with the circular part 12 and the square part 13 of the square pipe 11, which are opposing parts, to stop water. At the same time, the water-expandable sheet 34 supports the stepped portion 31b between the square tube portion 32 and the cylindrical portion 33 and retreats the square portion 13 toward the entrance side of the square tube portion 32 to engage the square portion 13. The stop projection 39 is brought into close contact with the stop projection 39. In other words, water can be stopped and a stable fixed state can be obtained.

特に係止突起３９は、図５に示したように幅方向に間隔を隔てて広い範囲に抜け止め作用を発揮するので、より安定した固定状態が得られる。 In particular, as shown in FIG. 5, the locking protrusions 39 exhibit a locking effect over a wide range at intervals in the width direction, so that a more stable fixed state can be obtained.

しかも、水膨張性シート３４は、角筒部３２の内面における切り欠き溝３７に接する位置から奥側、具体的には切り欠き溝３７の横線部３７ｂに接して設けられているので、水分の吸収は速やかに行われ、所望の効果を確実に得られる。 Moreover, since the water-swellable sheet 34 is provided on the inner surface of the rectangular tube part 32 from the position in contact with the notch groove 37, specifically in contact with the horizontal line part 37b of the notch groove 37, the water-swellable sheet 34 is Absorption occurs quickly, ensuring the desired effect.

以上のように、角型管１１をハンドホール５１に対して接続する作業は、ハンドホール５１に丸穴５３を形成して受け継手７１を固定して、この受け継手７１に差し込み継手３１を差し込むだけでよい。つまり、コンクリートに埋設した継手を用いる必要はなく、コンクリートの打設が不要であり、従来とは異なって製造に時間はかからない。しかも、接続作業に重量物の移動は不要であるため、従来に比べて極めて容易で、迅速に行える。 As described above, the work of connecting the square tube 11 to the hand hole 51 involves forming the round hole 53 in the hand hole 51, fixing the handle 71, and inserting the joint 31 into the handle 71. Just that is enough. In other words, there is no need to use joints buried in concrete, there is no need to cast concrete, and unlike conventional methods, manufacturing does not take much time. Moreover, since there is no need to move heavy objects for connection work, the connection work is much easier and faster than in the past.

しかも、差し込み継手３１の角筒部３２は、角型管１１を係止するための構成である変位板３８と係止突起３９を一体に有しているので、角型管１１を差し込むだけで容易に接続できる。このため、現場での接続作業は容易である。しかも、前述したように強固に安定した接続状態を維持できる。 Moreover, since the square tube part 32 of the insertion joint 31 integrally has a displacement plate 38 and a locking protrusion 39 that are configured to lock the square tube 11, the square tube 11 can be simply inserted. Easy to connect. Therefore, connection work on site is easy. Furthermore, as described above, a strong and stable connection state can be maintained.

以下、他の例に係る差し込み継手３１について説明する。この説明において、前述の構成と同一の部位については同一の符号を付してその詳しい説明を省略する。 Hereinafter, a plug-in joint 31 according to another example will be described. In this description, parts that are the same as those in the above-mentioned configuration are given the same reference numerals, and detailed description thereof will be omitted.

図８は他の例に係る差し込み継手３１の斜視図であり、図９は、その本体部３１ａの正面、平面、側面の各面と、断面（図９の（ｃ）におけるＢ－Ｂ断面図）を示す。前述例の差し込み継手３１と同様に、本体部３１ａと水膨張性シート３４を有し、本体部３１ａは角筒部３２と円筒部３３を有している。 FIG. 8 is a perspective view of a plug-in joint 31 according to another example, and FIG. 9 is a front, plane, and side surface of the main body 31a, and a cross section (BB sectional view in (c) of FIG. 9). ) is shown. Similar to the insertion joint 31 in the above example, it has a main body part 31a and a water-expandable sheet 34, and the main body part 31a has a rectangular tube part 32 and a cylindrical part 33.

円筒部３３は前述例とは異なり、全体が受け継手７１の受け筒部７６に差し込まれる部分である。円筒部３３の係止凹溝３５より角筒部３２側の部分が角型管１１の円形部１２が嵌る部分であるので、円筒部３３の内周面における係止凹溝３５に対応する部位にリブ状の環状突部３３ｄが形成されている。 The cylindrical portion 33 is a portion that is entirely inserted into the receiving cylindrical portion 76 of the handle 71, unlike the previous example. Since the part of the cylindrical part 33 closer to the square tube part 32 than the locking groove 35 is the part into which the circular part 12 of the square tube 11 fits, the part on the inner peripheral surface of the cylindrical part 33 that corresponds to the locking groove 35 A rib-shaped annular protrusion 33d is formed on the.

この差し込み継手３１は、呼び径が、例え１００ｍｍのように大きい角型管１１の接続に適したものであり、角筒部３２の係止突起３９は、幅広に形成されている。このため、係止突起３９にはぬすみが形成される。 This insertion joint 31 is suitable for connecting a rectangular tube 11 having a large nominal diameter, such as 100 mm, and the locking projection 39 of the rectangular tube portion 32 is formed wide. Therefore, a gap is formed in the locking protrusion 39.

以上のように構成された差し込み継手３１においても、前述例の差し込み継手３１と同様の作用を有し、効果を発揮する。 The plug-in joint 31 configured as described above also has the same function and effect as the plug-in joint 31 of the above-mentioned example.

前述の構成はこの発明を実施するための一形態を示し、この発明は前述の構成のみに限定されるものではなく、その他の構成を採用することができる。 The above-described configuration represents one form for carrying out the present invention, and the present invention is not limited to only the above-described configuration, and other configurations may be adopted.

例えば、差し込み継手３１は、ハンドホール５１に固定された受け継手７１に接続するほか、角型管１１同士の接続のために角型管１１に設けられた受け継手に接続するものであってもよい。 For example, the insertion joint 31 may be connected to a joint 71 fixed to the hand hole 51 or to a joint provided on the square tubes 11 for connecting the square tubes 11 to each other. good.

変位板３８は、四角形以外の形状であってもよく、角筒部３２の幅方向に複数備えてもよい。 The displacement plates 38 may have a shape other than a rectangle, and a plurality of displacement plates 38 may be provided in the width direction of the rectangular tube portion 32.

１１…角型管１１
１１ａ…差し込み先端部
１２…円形部
１３…角形部
３１…差し込み継手
３２…角筒部
３３…円筒部
３４…水膨張性シート
３５…係止凹溝
３７…切り欠き溝
３８…変位板
３９…係止突起
３９ａ…傾斜面
５１…ハンドホール
５３…丸穴
７１…受け継手
７７…係止リング 11... Square tube 11
11a...Plug-in tip part 12...Circular part 13...Square part 31...Plug-in joint 32...Square cylindrical part 33...Cylindrical part 34...Water-expandable sheet 35...Latching groove 37...Notch groove 38...Displacement plate 39...Engagement Retaining protrusion 39a...Slanted surface 51...Hand hole 53...Round hole 71...Handle 77...Latching ring

Claims (5)

断面形状円形の円形部と断面形状角形の角形部を長手方向に交互に有する角型管の端部が差し込まれる角筒部と、前記角筒部に一体形成されて受け継手に差し込まれる円筒部を有する差し込み継手であって、
前記角筒部が、少なくとも２個の前記角形部を挿入可能な長さに形成されるとともに、
前記角筒部における差し込まれた前記角型管の前記円形部に対応する部位に、前記角筒部の入り口側の一部を除いた周囲に切り欠き溝を有し内外に弾性変位する変位板が一体形成され、
前記変位板の内面に、内方へ突出する係止突起が幅方向に沿って複数並設され、
前記係止突起における前記角筒部の入り口側の面に、奥ほど内方に傾く傾斜面が形成され、
前記係止突起が、前記変位板における前記角筒部の長手方向の途中から先端側にかけて形成された
差し込み継手。 A square tube part into which the end of a square tube is inserted, which has circular parts with a circular cross section and square parts with a square cross section alternately in the longitudinal direction, and a cylindrical part integrally formed with the square tube part and inserted into the receiver. A bayonet joint having
The square tube part is formed to a length that allows insertion of at least two of the square parts, and
A displacement plate that has a notch groove around the periphery of the square tube part except for a part on the entrance side of the square tube part in a part corresponding to the circular part of the inserted square tube, and is elastically displaced inward and outward. are integrally formed,
A plurality of locking projections protruding inward are arranged in parallel along the width direction on the inner surface of the displacement plate,
An inclined surface is formed on a surface of the locking protrusion on the entrance side of the rectangular tube portion, which slopes inward toward the back ;
The locking protrusion is formed from the middle in the longitudinal direction of the square tube part of the displacement plate to the tip side.
Plug-in fitting. 前記変位板が前記角筒部の中心線を挟んで一対設けられた
請求項１に記載の差し込み継手。 2. The insertion joint according to claim 1, wherein a pair of said displacement plates are provided with a center line of said square tube section interposed therebetween. 前記変位板が、前記角筒部の幅方向の中間位置に、前記角筒部の幅方向における長さの３分の１より大きく平らに形成されるとともに、
前記係止突起が前記変位板の幅方向の両側縁に形成された
請求項１または請求項２に記載の差し込み継手。 The displacement plate is formed flat at an intermediate position in the width direction of the square tube part, and is larger than one-third of the length of the square tube part in the width direction,
The insertion joint according to claim 1 or 2, wherein the locking projections are formed on both widthwise edges of the displacement plate. 前記角筒部の内面における前記切り欠き溝に接する位置から奥側に水膨張性シートが備えられた
請求項１から請求項３のうちいずれか一項に記載の差し込み継手。 The insertion joint according to any one of claims 1 to 3 , wherein a water-expandable sheet is provided on the inner surface of the rectangular tube portion on the back side from a position in contact with the notch groove. 前記受け継手がハンドホールに形成された丸穴に固定されたものであり、
前記円筒部の先端部に、前記受け継手に設けられた係止リングが係止する円環状の係止凹溝が形成された
請求項１から請求項４のうちいずれか一項に記載の差し込み継手。 The handle is fixed to a round hole formed in the hand hole,
The insert according to any one of claims 1 to 4 , wherein the tip of the cylindrical portion is formed with an annular locking groove into which a locking ring provided on the handle is locked. Fittings.
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* Cited by examiner, † Cited by third party
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JP3089320B2 (en) 1997-02-24 2000-09-18 カナフレックスコーポレーション株式会社 Connection fitting
JP3430396B2 (en) 1998-11-12 2003-07-28 東拓工業株式会社 Bellmouth with joint, its block body and handhole
JP2003240175A (en) 2002-02-01 2003-08-27 Cable Management Products Ltd Coupling for pipe
JP2005172233A (en) 2003-11-20 2005-06-30 Totaku Industries Inc Structure of pipe connection part, and pipe joint
JP3947987B2 (en) 1998-06-09 2007-07-25 東拓工業株式会社 Connector for connecting helical tube to wall
JP2008014455A (en) 2006-07-07 2008-01-24 Kyowa Rubber Kk Tube joint structure
JP2008175304A (en) 2007-01-18 2008-07-31 Mirai Ind Co Ltd Pipe connector and pipe block body
JP2008185197A (en) 2007-01-31 2008-08-14 Mirai Ind Co Ltd Pipe fixture, and pipe fixing structure and pipe fixing method using the pipe fixture
JP2009250343A (en) 2008-04-04 2009-10-29 Totaku Industries Inc Connecting female part structure of corrugated resin pipe
JP5806565B2 (en) 2011-09-12 2015-11-10 株式会社利川プラスチック Block body mold

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3089320B2 (en) 1997-02-24 2000-09-18 カナフレックスコーポレーション株式会社 Connection fitting
JP3947987B2 (en) 1998-06-09 2007-07-25 東拓工業株式会社 Connector for connecting helical tube to wall
JP3430396B2 (en) 1998-11-12 2003-07-28 東拓工業株式会社 Bellmouth with joint, its block body and handhole
JP2003240175A (en) 2002-02-01 2003-08-27 Cable Management Products Ltd Coupling for pipe
JP2005172233A (en) 2003-11-20 2005-06-30 Totaku Industries Inc Structure of pipe connection part, and pipe joint
JP2008014455A (en) 2006-07-07 2008-01-24 Kyowa Rubber Kk Tube joint structure
JP2008175304A (en) 2007-01-18 2008-07-31 Mirai Ind Co Ltd Pipe connector and pipe block body
JP2008185197A (en) 2007-01-31 2008-08-14 Mirai Ind Co Ltd Pipe fixture, and pipe fixing structure and pipe fixing method using the pipe fixture
JP2009250343A (en) 2008-04-04 2009-10-29 Totaku Industries Inc Connecting female part structure of corrugated resin pipe
JP5806565B2 (en) 2011-09-12 2015-11-10 株式会社利川プラスチック Block body mold

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