JP3753881B2

JP3753881B2 - Branch pipe mounting structure

Info

Publication number: JP3753881B2
Application number: JP03537999A
Authority: JP
Inventors: 武彦渡部; 英治古川
Original assignee: Mitsubishi Plastics Inc
Current assignee: Mitsubishi Chemical Corp
Priority date: 1999-02-15
Filing date: 1999-02-15
Publication date: 2006-03-08
Anticipated expiration: 2019-02-15
Also published as: JP2000230687A

Description

【０００１】
【発明の属する技術分野】
本発明は枝管の取付構造に関し、詳しくは、地中に埋設されている既存の管路に枝管を接続するための取付構造に関する。
【０００２】
【従来の技術】
地中に埋設された既設の管路（埋設管）に新たな管路（枝管）を接続する方法として、特開平４−３４３９９８号公報等に記載された方法が知られている。この方法は、枝管より大径のパイプ（推進鋼管）を、埋設管の枝管接合部に向けて埋設管の近傍にまで至る所定の位置まで推進させ、該推進鋼管内の土砂を排出した後、推進鋼管内にホルソーを挿入して埋設管の周壁を穿孔することにより開口を形成し、次いでこの開口に枝管の先端部を挿入して接続し、最後に推進鋼管を抜取って枝管の外周部に土砂やモルタルを注入して固定するようにしている。
【０００３】
【発明が解決しようとする課題】
しかし、上述の方法では、枝管の先端部にカラーを装着して埋設管開口内への枝管先端部の挿入量を規制するようにしているため、強い力で枝管を押込むとカラーがずれてしまうことがあり、また、中心線がずれてしまうこともあった。したがって、埋設管と枝管との間の密着性が十分に得られなくなるおそれがあった。
【０００４】
そこで本発明は、枝管先端部を埋設管開口の所定位置に確実に取付けることができ、十分な密着性を得ることができる枝管の取付構造を提供することを目的としている。
【０００５】
【課題を解決するための手段】
上記目的を達成するため、本発明の枝管の取付構造は、埋設管の近傍にまで至る推進鋼管を通して穿孔した埋設管の開口に枝管を取付けるための構造において、前記枝管の先端に、外周面に前記推進鋼管の内径に対応したガイド突起が突設されるとともに先端部の外径が前記開口より僅かに小径に形成された接続用ソケットを装着し、該接続用ソケットの先端部外周に、開口内周面との間の隙間を閉塞可能な接着剤を塗布したことを特徴としている。
【０００６】
さらに、前記接続用ソケットの先端部外周に塗布した接着剤塗布部と接続用ソケットの受口外周の段部との間に、接続用ソケット先端の埋設管内への突出を規制する短管を装着したことを特徴としている。
【０００７】
【発明の実施の形態】
図１は、本発明の枝管の取付構造の一形態例を示す断面図、図２乃至図５は、枝管を取付ける手順を説明するための断面図であって、図２は推進鋼管を推進させてから枝管取付部の土砂を取除いた段階、図３は埋設管の周壁を穿孔している段階、図４は穿孔した開口に枝管先端の接続用ソケットを挿入する段階、図５は接続用ソケットを開口内に挿入した段階をそれぞれ示している。
【０００８】
まず、図１に示すように、埋設管１０への枝管１１の取付は、埋設管１０の周壁所定位置に穿孔された開口１２に対して、枝管１１の先端に装着した接続用ソケット１３を介して行われる。接続用ソケット１３は、枝管１１の先端が挿入される受口１４と、内径が枝管１１の内径と同一に形成された挿入管部１５と、受口１４の外周に適当な間隔で突設した複数のガイド突起１６とを有しており、開口１２への挿入に際しては、挿入管部１５の先端外周に接着剤１７が塗布されるとともに、該接着剤塗布部と前記受口１４の外周に形成されている段部１８との間に、挿入管部１５の外径に対応した内径を有する短管１９が装着される。
【０００９】
次に、上記取付構造により枝管１１を埋設管１０に取付ける手順を説明する。まず、図２に示すように、埋設管１０の近傍まで枝管１１より大径の推進鋼管２１を推進させ、推進鋼管２１内及び埋設管１０の周囲の土砂を排出する。そして、推進鋼管２１の先端周縁部と埋設管１０の外周との間にセメントミルク２０を充填する。
【００１０】
次いで図３に示すように、推進鋼管２１を通してホルソー２２を挿入し、埋設管１０の周壁を枝管１１の内径に対応した径で穿孔し、開口１２を形成する。このとき、ホルソー２２によって抜取られたコア２３は、ホルソー２２と共に抜取られる。
【００１１】
そして、図４に示すように、接続する枝管１１の先端に接続用ソケット１３を装着し、さらに、短管１９を装着して接着剤１７を塗布した状態で枝管１１を推進鋼管２１内に挿入していく。このとき、接続用ソケット１３の先端は、抜取ったコア２３の内周側形状に対応した湾曲形状に加工し、短管１９の先端は、コア２３の外周側形状に対応した湾曲形状に加工しておくことが好ましい。また、枝管１１の挿入に際しては、接続用ソケット１３に突設したガイド突起１６が推進鋼管２１の内周面に沿って進んでいくので、枝管１１及び接続用ソケット１３を推進鋼管２１の中心に合わせて挿入することができ、接続用ソケット１３の先端を埋設管１０の開口１２内に確実に挿入することができる。
【００１２】
図４の状態から更に枝管１１を挿入していくと、図５に示すように、埋設管１０の外面と短管１９の先端面との間に接着剤１７の一部が挟み込まれ、短管１９の後端は段部１８によって位置決めされているので、通常の挿入力（押込力）では、それ以上枝管１１を押込めない状態となる。
【００１３】
これにより、接続用ソケット１３の挿入管部１５の先端外周が接着剤１７を介して開口１２内に挿入され、短管１９の先端面と埋設管１０の外面との間にも接着剤１７が介在する状態となり、接着剤１７の乾燥固化によって埋設管１０と接続用ソケット１３とが強固にかつ密封状態で接続された状態となる。接着剤１７が十分に固化したら、推進鋼管２１の内周面と枝管１１の外周面との間にセメントミルクを充填して枝管１１の取付作業が終了する。
【００１４】
なお、接着剤１７には、硬化時間等を考慮すると、エポキシ系接着剤を使用することが望ましい。また、接続用ソケット１３の受口１４と枝管１１の先端との間は、通常の配管の接続と同じように接着剤等を用いて固定しておけばよい。さらに、前記コア２３の形状に合わせて接続用ソケット１３（挿入管部１５）の先端と短管１９の先端とを加工し、位置決めして組付けておくことにより、短管１９の先端湾曲形状が埋設管１０の外面に対応した位置になったときに、挿入管部１５の先端が埋設管１０の内面に対応した状態となり、埋設管１０内への突出を無くすことができる。この位置あわせは、図５の状態で枝管１１を左右に回動させることによって容易に行うことができる。
【００１５】
したがって、図６の断面図に示すように、推進鋼管の位置ずれなどによって開口１２が埋設管１０の中心に対して偏心した位置に形成されたとしても、回収したコアの形状に基づいて挿入管部１５の先端や短管１９の先端を加工しておくことにより、所定の接合状態で埋設管１０に枝管１１を取付けることができる。
【００１６】
図７は、本発明の他の形態例を示す断面図である。本形態例は、枝管１１の先端に装着する接続用ソケットを、両側に受口３１を有するとともに外周面に軸線方向の複数のリブ（ガイド突起）３２を設けたソケット３３と、該ソケット３３の一方の受口３１に装着した接続用パイプ３４とで形成したものである。
【００１７】
本形態例においても、前記接続用パイプ３４の先端部に接着剤１７を塗布し、該接着剤塗布部とソケット３３の先端との間に前記同様の短管１９を装着することにより、前記同様の手順で枝管１１を埋設管１０に取付けることができる。
【００１８】
また、図８は、本発明の更に他の形態例を示す断面図であって、図７に示したものと同様のソケット３３と接続用パイプ３４とで接続用ソケットを形成し、ソケット３３の先端から突出する接続用パイプ３４の先端外周に接着剤１７を塗布するようにしたものである。このように形成しても、前記同様の手順で枝管１１を埋設管１０に取付けることができる。
【００１９】
【発明の効果】
以上説明したように、本発明の枝管の取付構造によれば、埋設管に形成した開口の所定位置に枝管先端部を確実に取付けることができる。
【図面の簡単な説明】
【図１】本発明の枝管の取付構造の一形態例を示す断面図である。
【図２】推進鋼管を推進させてから枝管取付部の土砂を取除いた段階を示す断面図である。
【図３】埋設管の周壁を穿孔している段階を示す断面図である。
【図４】穿孔した開口に枝管先端の接続用ソケットを挿入する段階を示す断面図である。
【図５】接続用ソケットを開口内に挿入した段階を示す断面図である。
【図６】枝管が偏心して取付けられた状態を示す断面図である。
【図７】本発明の他の形態例を示す断面図である。
【図８】本発明の更に他の形態例を示す断面図である。
【符号の説明】
１０…埋設管、１１…枝管、１２…開口、１３…接続用ソケット、１４…受口、１５…挿入管部、１６…ガイド突起、１７…接着剤、１８…段部、１９…短管、２１…推進鋼管、２２…ホルソー、２３…コア、３１…受口、３２…リブ、３３…ソケット、３４…接続用パイプ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a branch pipe mounting structure, and more particularly to a mounting structure for connecting a branch pipe to an existing pipe line buried in the ground.
[0002]
[Prior art]
As a method for connecting a new pipe (branch pipe) to an existing pipe (buried pipe) buried in the ground, a method described in JP-A-4-343998 is known. In this method, a pipe (propulsion steel pipe) having a diameter larger than that of the branch pipe is propelled to a predetermined position reaching the vicinity of the buried pipe toward the branch pipe joint of the buried pipe, and the earth and sand in the propulsion steel pipe is discharged. After that, a hole saw is inserted into the propulsion steel pipe and an opening is formed by drilling the peripheral wall of the buried pipe, and then the tip of the branch pipe is inserted and connected to this opening, and finally the propulsion steel pipe is pulled out and branched. Sediment or mortar is poured into the outer periphery of the tube and fixed.
[0003]
[Problems to be solved by the invention]
However, in the above-described method, the collar is attached to the tip of the branch pipe so that the amount of the branch pipe tip inserted into the embedded pipe opening is regulated. May shift, and the center line may shift. Therefore, there is a possibility that sufficient adhesion between the buried pipe and the branch pipe cannot be obtained.
[0004]
SUMMARY OF THE INVENTION An object of the present invention is to provide a branch pipe mounting structure that can securely attach a tip of a branch pipe to a predetermined position of an opening of a buried pipe and obtain sufficient adhesion.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the branch pipe attachment structure of the present invention is a structure for attaching a branch pipe to an opening of a buried pipe drilled through a propulsion steel pipe reaching the vicinity of the buried pipe. A guide projection corresponding to the inner diameter of the propulsion steel pipe is provided on the outer peripheral surface, and a connection socket having an outer diameter slightly smaller than the opening is mounted. Further, an adhesive capable of closing a gap between the inner peripheral surface of the opening is applied.
[0006]
In addition, a short pipe is mounted between the adhesive application part applied to the outer periphery of the front end of the connection socket and the stepped part of the outer periphery of the connection socket to restrict the protrusion of the front end of the connection socket into the buried pipe. It is characterized by that.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a cross-sectional view showing an embodiment of an attachment structure of a branch pipe according to the present invention, FIGS. 2 to 5 are cross-sectional views for explaining a procedure for attaching a branch pipe, and FIG. FIG. 3 shows a stage where a peripheral wall of a buried pipe is drilled, FIG. 4 shows a stage where a branch socket connection socket is inserted into the drilled opening, and FIG. Reference numeral 5 denotes a stage where the connection socket is inserted into the opening.
[0008]
First, as shown in FIG. 1, the branch pipe 11 is attached to the buried pipe 10 by connecting the connection socket 13 attached to the distal end of the branch pipe 11 with respect to the opening 12 drilled at a predetermined position on the peripheral wall of the buried pipe 10. Is done through. The connection socket 13 protrudes from the receiving port 14 into which the tip of the branch tube 11 is inserted, the insertion tube portion 15 having an inner diameter that is the same as the inner diameter of the branch tube 11, and the outer periphery of the receiving port 14 at appropriate intervals. A plurality of guide protrusions 16 are provided, and when inserting into the opening 12, an adhesive 17 is applied to the outer periphery of the distal end of the insertion tube portion 15, and the adhesive application portion and the receiving port 14 A short tube 19 having an inner diameter corresponding to the outer diameter of the insertion tube portion 15 is mounted between the step portion 18 formed on the outer periphery.
[0009]
Next, a procedure for attaching the branch pipe 11 to the buried pipe 10 using the above-described attachment structure will be described. First, as shown in FIG. 2, the propulsion steel pipe 21 having a larger diameter than the branch pipe 11 is propelled to the vicinity of the buried pipe 10, and the earth and sand in the propulsion steel pipe 21 and around the buried pipe 10 are discharged. Then, cement milk 20 is filled between the peripheral edge of the tip of the propulsion steel pipe 21 and the outer periphery of the buried pipe 10.
[0010]
Next, as shown in FIG. 3, the hole saw 22 is inserted through the propulsion steel pipe 21, and the peripheral wall of the buried pipe 10 is drilled with a diameter corresponding to the inner diameter of the branch pipe 11 to form the opening 12. At this time, the core 23 extracted by the horso 22 is extracted together with the horso 22.
[0011]
Then, as shown in FIG. 4, the connection socket 13 is attached to the tip of the branch pipe 11 to be connected, and further, the short pipe 19 is attached and the adhesive 17 is applied to the branch pipe 11 in the propulsion steel pipe 21. Insert into. At this time, the tip of the connection socket 13 is processed into a curved shape corresponding to the inner peripheral side shape of the extracted core 23, and the tip of the short tube 19 is processed into a curved shape corresponding to the outer peripheral side shape of the core 23. It is preferable to keep it. Further, when inserting the branch pipe 11, the guide protrusion 16 projecting from the connection socket 13 advances along the inner peripheral surface of the propulsion steel pipe 21, so that the branch pipe 11 and the connection socket 13 are connected to the propulsion steel pipe 21. It can be inserted in alignment with the center, and the tip of the connection socket 13 can be reliably inserted into the opening 12 of the buried tube 10.
[0012]
When the branch pipe 11 is further inserted from the state of FIG. 4, as shown in FIG. 5, a part of the adhesive 17 is sandwiched between the outer surface of the buried pipe 10 and the tip surface of the short pipe 19, and Since the rear end of the pipe 19 is positioned by the step portion 18, the branch pipe 11 cannot be pushed any further with a normal insertion force (pushing force).
[0013]
As a result, the outer periphery of the distal end of the insertion tube portion 15 of the connection socket 13 is inserted into the opening 12 via the adhesive 17, and the adhesive 17 is also applied between the distal end surface of the short tube 19 and the outer surface of the embedded tube 10. As a result, the buried tube 10 and the connection socket 13 are firmly connected in a sealed state by drying and solidifying the adhesive 17. When the adhesive 17 is sufficiently solidified, cement milk is filled between the inner peripheral surface of the propulsion steel pipe 21 and the outer peripheral surface of the branch pipe 11, and the mounting operation of the branch pipe 11 is completed.
[0014]
For the adhesive 17, it is desirable to use an epoxy adhesive in consideration of curing time and the like. Moreover, what is necessary is just to fix between the receptacle 14 of the socket 13 for connection, and the front-end | tip of the branch pipe 11 using an adhesive etc. similarly to the connection of normal piping. Furthermore, the tip of the short tube 19 is curved by processing the tip of the connection socket 13 (insertion tube portion 15) and the tip of the short tube 19 in accordance with the shape of the core 23, positioning and assembling them. When a position corresponding to the outer surface of the embedded tube 10 is reached, the distal end of the insertion tube portion 15 is in a state corresponding to the inner surface of the embedded tube 10, and protrusion into the embedded tube 10 can be eliminated. This alignment can be easily performed by rotating the branch pipe 11 left and right in the state of FIG.
[0015]
Therefore, as shown in the cross-sectional view of FIG. 6, even if the opening 12 is formed at a position eccentric with respect to the center of the buried pipe 10 due to the displacement of the propulsion steel pipe, the insertion pipe is based on the recovered core shape. By processing the tip of the portion 15 and the tip of the short pipe 19, the branch pipe 11 can be attached to the buried pipe 10 in a predetermined joined state.
[0016]
FIG. 7 is a sectional view showing another embodiment of the present invention. In this embodiment, a connection socket to be attached to the tip of the branch pipe 11, a socket 33 having a receiving port 31 on both sides and a plurality of axial ribs (guide protrusions) 32 on the outer peripheral surface, and the socket 33 This is formed by a connecting pipe 34 attached to one of the receiving ports 31.
[0017]
Also in this embodiment, the adhesive 17 is applied to the tip of the connection pipe 34, and the short tube 19 similar to that described above is mounted between the adhesive applicator and the tip of the socket 33. The branch pipe 11 can be attached to the buried pipe 10 by the following procedure.
[0018]
FIG. 8 is a cross-sectional view showing still another embodiment of the present invention. A socket 33 and a connection pipe 34 similar to those shown in FIG. The adhesive 17 is applied to the outer periphery of the tip of the connection pipe 34 protruding from the tip. Even if formed in this way, the branch pipe 11 can be attached to the buried pipe 10 in the same procedure as described above.
[0019]
【The invention's effect】
As described above, according to the branch pipe attachment structure of the present invention, the branch pipe tip can be reliably attached to a predetermined position of the opening formed in the buried pipe.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an embodiment of a branch pipe mounting structure according to the present invention.
FIG. 2 is a cross-sectional view showing a stage in which earth and sand at a branch pipe mounting portion is removed after propelling a propulsion steel pipe.
FIG. 3 is a cross-sectional view showing a stage in which a peripheral wall of an embedded pipe is drilled.
FIG. 4 is a cross-sectional view showing a step of inserting a connecting socket at the tip of a branch pipe into a perforated opening.
FIG. 5 is a cross-sectional view showing a stage in which the connection socket is inserted into the opening.
FIG. 6 is a cross-sectional view showing a state where the branch pipe is attached eccentrically.
FIG. 7 is a sectional view showing another embodiment of the present invention.
FIG. 8 is a cross-sectional view showing still another embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Embedded pipe, 11 ... Branch pipe, 12 ... Opening, 13 ... Connection socket, 14 ... Receptacle, 15 ... Insertion pipe part, 16 ... Guide protrusion, 17 ... Adhesive, 18 ... Step part, 19 ... Short pipe 21 ... Propulsion steel pipe, 22 ... Holso, 23 ... Core, 31 ... Receptor, 32 ... Rib, 33 ... Socket, 34 ... Connection pipe

Claims

In the structure for attaching the branch pipe to the opening of the buried pipe drilled through the propulsion steel pipe extending to the vicinity of the buried pipe, a guide projection corresponding to the inner diameter of the propulsion steel pipe is projected on the outer peripheral surface of the branch pipe. In addition, an adhesive that attaches a connection socket having an outer diameter slightly smaller than that of the opening and closes a gap between the outer periphery of the connection socket and the inner peripheral surface of the opening on the outer periphery of the connection socket A branch pipe mounting structure characterized in that is applied.

A short pipe that restricts the protrusion of the connecting socket tip into the buried pipe was mounted between the adhesive application part applied to the outer periphery of the tip of the connecting socket and the stepped part of the outer periphery of the receiving socket of the connecting socket. The attachment structure of the branch pipe of Claim 1 characterized by these.