JP3523993B6 - Liner for seismic propulsion pipe - Google Patents

Liner for seismic propulsion pipe Download PDF

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Publication number
JP3523993B6
JP3523993B6 JP1997303224A JP30322497A JP3523993B6 JP 3523993 B6 JP3523993 B6 JP 3523993B6 JP 1997303224 A JP1997303224 A JP 1997303224A JP 30322497 A JP30322497 A JP 30322497A JP 3523993 B6 JP3523993 B6 JP 3523993B6
Authority
JP
Japan
Prior art keywords
pipe
liner
propulsion
propulsion pipe
intermediate piece
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP1997303224A
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Japanese (ja)
Other versions
JPH11141278A (en
JP3523993B2 (en
Inventor
範行 荒川
孝浩 石原
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kubota Corp
Original Assignee
Kubota Corp
Filing date
Publication date
Application filed by Kubota Corp filed Critical Kubota Corp
Priority to JP1997303224A priority Critical patent/JP3523993B6/en
Publication of JPH11141278A publication Critical patent/JPH11141278A/en
Application granted granted Critical
Publication of JP3523993B2 publication Critical patent/JP3523993B2/en
Publication of JP3523993B6 publication Critical patent/JP3523993B6/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Description

【0001】
【発明の属する技術分野】
この発明は、耐震推進管用ライナに関する。
【0002】
【従来の技術】地中埋設管の敷設工法として、推進管工法が知られている。この推進工法は、推進管の単管を挿入できる断面積に穿った発進立て坑の側面より管路に沿う方向に管を順次接続しつつ押入推進していくもので、管路に沿って地表を掘削する開削工法に比べ工事のための地表占有面積が非常に小さく、特に都市部の管施工法として非常に有用である利点を有する。
【0003】
ところで、推進管工法では既挿入管の挿口を新規挿入管の受口奥端に当接させこの当接部分から先行管に推進力を伝えて行くため、通常の工法では敷設管路の管継手部の軸方向押込み代は全くゼロとなる。
【0004】
しかし、近年推進管工法で耐震管路を敷設する場合が増加しており、この場合上記工法そのままでは適当でなく、地盤の変動に対応して継手部の伸縮を可能にする何らかの手段が必要となる。
【0005】
このため、図5に示すように推進管1の挿口1A先端と受口1B奥端との間に伸縮代を形成するライナ2を介挿して管1を推進工法で推進させ、管路敷設後上記ライナ2を除去することにより必要な伸縮代用の隙間Sを設けることが行なわれている。
【0006】
なお、図5において、1Cはダクタイル推進管1の内面セメントライニング層、1Dは離脱防止リング、1Eはゴム輪、1Fは押し輪、1Gは押し輪1F及び締結ボルト1Hを土砂やグラウトから保護するカバーを示す。
【0007】
【発明が解決しようとする課題】
しかしながら、推進管1の敷設後ライナ2を取り外す場合、前後に接続された推進管1、1は管軸方向の推進力と管周囲と地盤との摩擦による推進抗力とが作用するため、ライナ2には矢印で示すように強大な軸方向圧縮力が作用しており、このような状況下でライナ2を無理に管内方向に牽引して取り外すと図6に示すようにダクタイル管管端部の内面ライニング層1Cがライナ2との摩擦力によって剥離することがある問題があった。
【0008】
また、このような事故が生じれば剥離部の補修などが必要となり、敷設後の点検補修作業に非常に手間もかかる欠点もあった。本発明は、上記欠点を解消することを目的としてなされたものであり、推進管工法で耐震管を敷設した場合、管相互の圧縮代を確保するために介挿されるライナを、内面ライニング層の剥離の恐れなく取り外すことができるようにすることを目的としてなされたものである。
【0009】
【課題を解決するための手段】
この発明の耐震推進管用ライナは、耐震管路を推進管工法で敷設する場合、推進 管の挿口先端と受口奥端との間に伸縮代を形成しつつ推 進するために介挿されるライナであって、周方向に等角分割されたブロック状をなし、かつ該ブロック状体は軸方向に三分割され、中間片の軸方向断面が管中心側が長辺、管外面側が短辺の台形状をなし、該中間片を挟む両側片は前記台形状の斜片と接する面を有し、さらに前記中間片の管内面側に該中間片の径方向引き抜き治具用の係止部が設けられ、前記中間片には、両側片方向へボル トが貫通して設けられ、両側片には前記ボルトを径方向 にガイドする径方向ガイドがそれぞれ設けられ、前記中 間片と前記両側片とが前記ボルトで連接されたまま径方 向に相対変位可能とされていることを特徴とするものである。
【0010】
【発明の実施の形態】
次にこの発明の耐震推進管用ライナの実施の形態について説明する。図1はこの発明の一実施の形態の軸方向断面図、図2は受口開口から奥方向を見た正面図、図3は拡大正面図、図4は分解斜視図である。
【0011】
この発明の耐震推進管用ライナは、推進管1の挿口1A先端と受口1B奥端との間に介挿されるライナ2であって、図2に示すように周方向に等角分割されたブロック状2Aをなし、かつ該ブロック状体2Aは図1に示すように軸方向に三分割され、中間片3の軸方向断面が図1、図3に示すように管中心側が長辺3A、管外面側が短辺3Bの台形状をなし、該中間片3を挟む両側片4、4は前記台形状の斜片3C、3Cと接する面を有し、さらに前記中間片3の管内面側3Aに該中間片3の径方向引き抜き治具4用の係止部6が設けられて構成されている。
【0012】
上記において耐震推進管用ライナ2を構成するブロック状体2Aとして、推進管の周囲に四等分配置とした場合を示したが、これに限らず、管内方向に相互の干渉なく引き抜き可能な周方向の分割長さであれば三等分、五等分などの配置状態としても良い。
【0013】
また、中間片3の係止部6は引き抜き治具5のフック5Aと係合容易な環状体とした場合を示したが、引き抜き治具4との係合が容易に可能であれば、図示は省略するが、フック状、あり溝のように奥方が拡大された係合溝、係合孔などであっても良い。
【0014】
三分割された分割片3、4、4は、図示のようにボルト7で一体に連接されている。このように構成することで後述するように、脱着時に各構成部材が散乱するのが防げ都合が良い。
【0015】
図1において、ボルト7は中間片3を軸方向に貫通して設けられ、このボルト7に対し両側片4、4に設けた径方向の長孔ガイド8、8を介して係合され、中間片3と両側片4、4と径方向相対変位可能とされている。
【0016】
次に、この発明の耐震推進管用ライナ2の使用状態について説明する。まず耐震推進管用ライナ2の各構成部材を組み立て、図1に示すようにボルト7を締結して一体化する。
【0017】
これを図1に示すように推進管の挿口1A先端と受口1B奥端との間に介挿し、管に推進力を加えて常法に従い管路に沿って推進していく。そして所定の管路に管を敷設後、ライナ2を除去する。
【0018】
このライナ2の除去は、中間片3の係止部6に引き抜き治具5を係止し、中間片3のみを管中心方向へ引き抜く。この時、中間片3と両側片4、4は管中心方向へ向かって開き勝手の斜面で接しているため両側辺4、4を残したまま中間片3のみが抜け出、次いで両側片4、4が中間片3側へ変位して介挿部から抜け出る。
【0019】
従って、ライナ2を除去する際、挿口1A先端と受口1B奥端は共に両側片4、4で保護され引き抜き時の摩擦力が作用せず、剥離損傷を受けることがない。なお、中間片3と両側片4、4とをボルト7で締結した場合であっても、ボルト7は両側片4、4の長孔ガイド8に沿って変位するので中間片3の抜き出しは容易に行なえる。
【0020】
また、外した後も中間片3と両側片4、4はボルト7を介して連接したままであるから分解して散乱してしまうこともない。
【0021】
【発明の効果】
この発明は以上説明したように、耐震管路を推進管工法で敷設する場合、管継手部の管軸方向の押し込み代を設定するライナを三分割構成とし、中間片を台形状として抜き勝手の良い形状としたため、敷設後の推進管の継手部からライナを外す場合、ライナの除去が非常に簡単となり、しかも挿口端面の内面ライニングは両側片によって保護された状態となるので損傷することはない。 また、外した後も中間片3と両側片4、4 はボルト7を介して連接したままであるから分解して散 乱してしまうこともない。
【0022】
従って、耐震管路を推進管工法で敷設しても、敷設後の点検補修の手間が大幅に省略可能となる。
【図面の簡単な説明】
【図1】この発明の一実施の形態の軸方向断面図である。
【図2】受口開口から奥方向を見た正面図である。
【図3】この発明の一実施の形態の拡大正面図である。
【図4】この発明の一実施の形態の分解斜視図である。
【図5】従来例の説明断面図である。
【図6】従来例の説明断面図である。
【符号の説明】
1 推進管
1A 挿口
1B 受口
2 ライナ
2A ブロック状体
3 中間片
3A 長辺
3B 短辺
3C 斜片
4 両側片
5 径方向引き抜き治具
6 係止部
7 ボルト
8 長孔ガイド
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a liner for a seismic propulsion pipe.
[0002]
2. Description of the Related Art As a method of laying underground pipes, a propulsion pipe method is known. This propulsion method involves pushing in the pipe while sequentially connecting the pipes in the direction along the pipeline from the side of the starting shaft with a cross-sectional area that can insert a single pipe of the propulsion pipe. The surface area occupied by the construction is very small as compared with the open-cutting method for excavating the ground.
[0003]
By the way, in the propulsion pipe method, the insertion port of the already inserted pipe is brought into contact with the back end of the new insertion pipe, and the propulsion force is transmitted from this abutting part to the preceding pipe. The axial pushing allowance of the joint is completely zero.
[0004]
However, in recent years, the number of cases of laying seismic pipes by the propulsion pipe method has been increasing, and in this case, the above method is not appropriate as it is, and some means is required to enable the joint to expand and contract in response to changes in the ground. Become.
[0005]
For this reason, as shown in FIG. 5, the pipe 1 is propelled by the propulsion method by interposing a liner 2 which forms an expansion and contraction between the end of the insertion port 1A of the propulsion pipe 1 and the back end of the reception port 1B, and lays the pipeline. Thereafter, by removing the liner 2, a necessary gap S for expansion and contraction is provided.
[0006]
In FIG. 5, 1C is an inner surface cement lining layer of the ductile propulsion pipe 1, 1D is a separation prevention ring, 1E is a rubber ring, 1F is a push ring, 1G is a push ring 1F and a fastening bolt 1H is protected from earth and sand and grout. Show the cover.
[0007]
[Problems to be solved by the invention]
However, when the liner 2 is removed after the laying of the propulsion pipe 1, the propulsion pipes 1 and 1 connected before and after the propulsion in the pipe axis direction and the propulsion drag due to the friction between the circumference of the pipe and the ground act. A strong axial compressive force acts on the end of the ductile pipe as shown in FIG. 6 when the liner 2 is forcibly pulled inward and removed in such a situation as shown by the arrow in FIG. There is a problem that the inner lining layer 1C may be peeled off by frictional force with the liner 2.
[0008]
In addition, if such an accident occurs, it is necessary to repair the peeled portion, and the inspection and repair work after the laying is very troublesome. The present invention has been made for the purpose of solving the above-mentioned drawbacks, and when an earthquake-resistant pipe is laid by a propulsion pipe method, a liner inserted to secure a compression allowance between the pipes is formed on an inner lining layer. The purpose is to enable removal without fear of peeling.
[0009]
[Means for Solving the Problems]
Seismic propulsion pipe liner of the invention, when laying seismic line in propulsion tube method, interposed to promote while forming a stretch margin between the spigot tip and socket inner end of the propulsion tube A liner, which is formed in a block shape that is equiangularly divided in the circumferential direction, and the block-shaped body is divided into three in the axial direction, and the axial section of the intermediate piece has a long side on the tube center side and a short side on the tube outer surface side. A trapezoidal shape, both side pieces sandwiching the intermediate piece have surfaces in contact with the oblique piece of the trapezoidal shape, and further, a locking portion for a radial drawing jig of the intermediate piece is provided on the inner surface of the pipe of the intermediate piece. provided, said the intermediate piece, bolts are provided through the sides unidirectional, on both sides piece provided radially guide for guiding the bolt in the radial direction, respectively, the two side pieces and the during piece Doo is characterized in that it is capable displaced relative to the radial direction toward remain connected with the bolt Than it is.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of a seismic propulsion pipe liner according to the present invention will be described. FIG. 1 is an axial sectional view of an embodiment of the present invention, FIG. 2 is a front view as viewed from a receptacle opening in a depth direction, FIG. 3 is an enlarged front view, and FIG. 4 is an exploded perspective view.
[0011]
The liner for an earthquake-resistant propulsion pipe according to the present invention is a liner 2 interposed between a front end of an insertion port 1A of a propulsion pipe 1 and a rear end of a receiving port 1B, and is circumferentially equiangularly divided as shown in FIG. As shown in FIG. 1, the block-shaped body 2A is divided into three parts in the axial direction, and the axial section of the intermediate piece 3 is a long side 3A as shown in FIGS. The outer surface of the tube has a trapezoidal shape with a short side 3B, and both side pieces 4, 4 sandwiching the intermediate piece 3 have surfaces in contact with the oblique pieces 3C, 3C of the trapezoidal shape. And a locking portion 6 for the jig 4 for radially pulling out the intermediate piece 3 is provided.
[0012]
In the above, the case where the block-shaped body 2A constituting the liner 2 for the earthquake-resistant propulsion pipe is arranged in quadrants around the propulsion pipe has been described. However, the present invention is not limited to this. If the division length is, the arrangement state may be divided into three equal parts, five equal parts, or the like.
[0013]
Also, the case where the engaging portion 6 of the intermediate piece 3 is an annular body that is easily engaged with the hook 5A of the extraction jig 5 is shown. May be omitted, but may be an engagement groove, an engagement hole, or the like, whose back is enlarged like a hook-shaped groove.
[0014]
The three divided pieces 3, 4, 4 are integrally connected by bolts 7 as shown . With this configuration, as will be described later, it is convenient to prevent the components from scattering when detached.
[0015]
In FIG. 1, a bolt 7 is provided to penetrate the intermediate piece 3 in the axial direction, and is engaged with the bolt 7 through radial long hole guides 8, 8 provided on both side pieces 4, 4. The piece 3 and the side pieces 4, 4 can be relatively displaced in the radial direction.
[0016]
Next, the use state of the seismic propulsion pipe liner 2 of the present invention will be described. First, the components of the seismic propulsion pipe liner 2 are assembled, and bolts 7 are fastened and integrated as shown in FIG.
[0017]
As shown in FIG. 1, this is inserted between the distal end of the insertion port 1A of the propulsion pipe and the rear end of the reception port 1B, and a propulsion force is applied to the pipe to propel it along the pipe in a conventional manner. After laying a pipe in a predetermined pipe line, the liner 2 is removed.
[0018]
To remove the liner 2, the pull-out jig 5 is locked to the locking portion 6 of the intermediate piece 3, and only the intermediate piece 3 is pulled out toward the pipe center. At this time, the intermediate piece 3 and both side pieces 4 and 4 open toward the center of the pipe and are in contact with each other on an inclined surface, so that only the intermediate piece 3 comes out while leaving both sides 4 and 4, and then both side pieces 4 and 4 Is displaced toward the intermediate piece 3 and comes out of the insertion portion.
[0019]
Therefore, when the liner 2 is removed, the distal end of the insertion opening 1A and the back end of the receiving opening 1B are both protected by the side pieces 4, 4, and no frictional force is exerted when the liner 2 is pulled out. Even when the intermediate piece 3 and the side pieces 4, 4 are fastened with bolts 7, the bolt 7 is displaced along the long hole guide 8 on both side pieces 4, 4, so that the extraction of the intermediate piece 3 is easy. Can be done.
[0020]
Further, even after being removed, the intermediate piece 3 and the side pieces 4, 4 are still connected via the bolt 7, so that they are not disassembled and scattered.
[0021]
【The invention's effect】
INDUSTRIAL APPLICABILITY As described above, when laying an earthquake-resistant pipe by the propulsion pipe method, the present invention has a liner for setting a plunge allowance in a pipe axis direction of a pipe joint portion, and has a trapezoidal shape of an intermediate piece so that it can be easily pulled out. Because of the good shape, when removing the liner from the joint part of the propulsion pipe after laying, it is very easy to remove the liner, and the inner lining of the insertion end face is protected by the pieces on both sides, so it will not be damaged. Absent. Nor that disturbs dispersed decomposed because the intermediate piece 3 and the both side pieces 4 and 4 remains connected through the bolt 7 even after removal.
[0022]
Therefore, even if the seismic pipe is laid by the propulsion pipe method, the time and labor for inspection and repair after the laying can be greatly reduced.
[Brief description of the drawings]
FIG. 1 is an axial sectional view of an embodiment of the present invention.
FIG. 2 is a front view of the interior viewed from a receiving opening.
FIG. 3 is an enlarged front view of one embodiment of the present invention.
FIG. 4 is an exploded perspective view of one embodiment of the present invention.
FIG. 5 is an explanatory sectional view of a conventional example.
FIG. 6 is an explanatory sectional view of a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Propulsion pipe 1A Insertion opening 1B Reception opening 2 Liner 2A Block-shaped body 3 Intermediate piece 3A Long side 3B Short side 3C Sloped side 4 Side piece 5 Radial pull-out jig 6 Locking part 7 Bolt 8 Long hole guide

Claims (1)

耐震管路を推進管工法で敷設する場合、推進管の挿口先端と受口奥端との間に伸縮代を形成しつつ推進するために介挿されるライナであって、周方向に等角分割されたブロック状をなし、かつ該ブロック状体は軸方向に三分割され、中間片の軸方向断面が管中心側が長辺、管外面側が短辺の台形状をなし、該中間片を挟む両側片は前記台形状の斜辺と接する面を有し、さらに前記中間片の管内面側に該中間片の径方向引き抜き治具用の係止部が設けられ、前記中間片には、両側片方向へボルトが貫通して設けられ、両側片には前記ボルトを径方向にガイドする径方向ガイドがそれぞれ設けられ、前期中間片と前記両側片とが前記ボルトで連接されたまま径方向に相対変位可能とされていることを特徴とする耐震推進管用ライナ。 When laying seismic pipes by the propulsion pipe method, it is a liner that is inserted for propulsion while forming an expansion / contraction allowance between the insertion end of the propulsion pipe and the back end of the propulsion pipe. It forms a divided block shape, and the block-shaped body is divided into three in the axial direction, and the axial section of the intermediate piece has a trapezoidal shape with the long side on the tube center side and the short side on the tube outer surface side, and sandwiches the middle piece. Both side pieces have a surface in contact with the oblique side of the trapezoidal shape, and further, a locking portion for a radial drawing jig of the middle piece is provided on the inner surface side of the pipe of the middle piece. Bolts are provided in the direction, and radial guides for guiding the bolt in the radial direction are provided on both side pieces, respectively, and the intermediate piece and the both side pieces are connected in the radial direction while being connected by the bolt. A liner for seismic propulsion pipes characterized by being displaceable .
JP1997303224A 1997-11-06 Liner for seismic propulsion pipe Expired - Fee Related JP3523993B6 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1997303224A JP3523993B6 (en) 1997-11-06 Liner for seismic propulsion pipe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1997303224A JP3523993B6 (en) 1997-11-06 Liner for seismic propulsion pipe

Publications (3)

Publication Number Publication Date
JPH11141278A JPH11141278A (en) 1999-05-25
JP3523993B2 JP3523993B2 (en) 2004-04-26
JP3523993B6 true JP3523993B6 (en) 2004-08-18

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