JPH04333722A - Method for jointing propeller pipe and existent man-hole to each other - Google Patents
Method for jointing propeller pipe and existent man-hole to each otherInfo
- Publication number
- JPH04333722A JPH04333722A JP3101498A JP10149891A JPH04333722A JP H04333722 A JPH04333722 A JP H04333722A JP 3101498 A JP3101498 A JP 3101498A JP 10149891 A JP10149891 A JP 10149891A JP H04333722 A JPH04333722 A JP H04333722A
- Authority
- JP
- Japan
- Prior art keywords
- propulsion
- pipe
- hole
- manhole
- annular body
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 31
- 229920005989 resin Polymers 0.000 claims abstract description 28
- 239000011347 resin Substances 0.000 claims abstract description 28
- 239000006260 foam Substances 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 2
- 238000005187 foaming Methods 0.000 abstract description 19
- 229920001971 elastomer Polymers 0.000 abstract description 17
- 239000005060 rubber Substances 0.000 abstract description 16
- 239000011800 void material Substances 0.000 abstract 2
- 238000007796 conventional method Methods 0.000 description 7
- 238000002347 injection Methods 0.000 description 6
- 239000007924 injection Substances 0.000 description 6
- 238000009412 basement excavation Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000004570 mortar (masonry) Substances 0.000 description 4
- 239000002689 soil Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 229920000459 Nitrile rubber Polymers 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 239000011083 cement mortar Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 239000002990 reinforced plastic Substances 0.000 description 2
- 229920003048 styrene butadiene rubber Polymers 0.000 description 2
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000002174 Styrene-butadiene Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000006261 foam material Substances 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 239000012948 isocyanate Substances 0.000 description 1
- 150000002513 isocyanates Chemical class 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- 150000003077 polyols Chemical class 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Landscapes
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は推進管と既設人孔との接
続方法、すなわち地表の土を開削することなく推進工法
によって地中に埋設された管を既設の人孔に接続させる
方法に関する。[Field of Industrial Application] The present invention relates to a method for connecting a propulsion pipe to an existing manhole, that is, a method for connecting a pipe buried underground by the propulsion method to an existing manhole without excavating the surface soil. .
【０００２】0002
【従来の技術】例えば、地中に排水管を埋設する場合、
先端にオーガー等の掘削機構を備えた掘削装置によって
地中に埋設孔を掘削しながら、掘削装置の掘削推進につ
づいて管（この明細書において推進管という）を推進さ
せ、これによって推進管を埋設していく推進工法と言わ
れる方法が採用されることがある。[Prior Art] For example, when burying a drainage pipe underground,
While excavating an underground hole with a drilling device equipped with an auger or other excavation mechanism at the tip, a pipe (referred to as a propulsion tube in this specification) is propelled following the excavation movement of the excavation device, whereby the propulsion tube is A method known as the burying method is sometimes used.
【０００３】この種の工法においては、立坑内に設置さ
れた推進機によって推進管を進行させ、その先端部を所
定の人孔に到達させて、最終的には推進管と人孔とを所
定の状態に接続するが、そのような到達側の人孔として
既設のマンホールを利用することが多い。特に、口径が
８００ｍｍ程度の小口径推進管の場合には、到達側人孔
として既設マンホールがしばしば利用される。[0003] In this type of construction method, the propulsion pipe is advanced by a propulsion machine installed in the shaft, and its tip reaches a predetermined manhole, and finally the propulsion pipe and the manhole are moved to a predetermined position. However, existing manholes are often used as manholes on the reaching side. In particular, in the case of a small-diameter propulsion pipe with a diameter of about 800 mm, an existing manhole is often used as the reaching side manhole.
【０００４】その場合、従来においては、既設マンホー
ルの壁部に推進管の管径よりも大きな管取り付け用の穴
を斫り、この穴（以下、斫り穴という）に推進管の先端
部を到達させた後、推進管と斫り穴との隙間にセメント
モルタルや樹脂モルタル等を充填して固結させる方法が
採られている。In that case, conventionally, a hole for attaching a pipe larger than the diameter of the propulsion pipe is cut in the wall of the existing manhole, and the tip of the propulsion pipe is inserted into this hole (hereinafter referred to as the "drilled hole"). After reaching the target, the gap between the propulsion tube and the drilled hole is filled with cement mortar, resin mortar, etc. and solidified.
【０００５】[0005]
【発明が解決しようとする課題】然るに、斫り穴と推進
管との隙間をセメントモルタルや樹脂モルタルで充填固
結させる上記のような従来の方法によると、マンホール
と推進管との接続部への応力集中により接続部に亀裂が
生じ、その接続部から漏水したり推進管が抜けたりする
ことがあった。そのため、推進管の外側にカラーを被せ
て強度を高めることも行われているが、既設のマンホー
ル内でカラー装着するために推進管をＲカットし、カラ
ー装着が容易に行えるようにそのカット面をサンダーで
更にテーパ状に加工する必要があった。[Problems to be Solved by the Invention] However, according to the above-mentioned conventional method of filling and solidifying the gap between the manhole and the propulsion pipe with cement mortar or resin mortar, it is difficult to The stress concentration caused cracks to occur in the joints, which could cause water to leak or the propulsion tube to come off. For this reason, a collar is placed on the outside of the propulsion tube to increase its strength, but the propulsion tube is R-cut in order to attach the collar inside an existing manhole, and the cut surface is cut so that the collar can be easily attached. It was necessary to further process it into a tapered shape using a sander.
【０００６】しかも、現状では、これらの作業を全て既
設マンホール内の手加工に頼っていることから作業性が
悪く、特に管底部のテーパ加工はスペースが小さいため
作業に長時間を要するという問題があった。[0006] Moreover, at present, all of these operations rely on manual machining inside the existing manhole, which results in poor work efficiency. In particular, tapering the bottom of the pipe requires a long time to complete because the space is small. there were.
【０００７】また、カラー装着後において、斫り穴とカ
ラーとの隙間にモルタルを充填する際、斫り穴は通常は
真円ではなくギザギザ断面となっているため、推進管を
良好な状態に接続するのは困難であった。[0007] Furthermore, when filling the gap between the drilled hole and the collar with mortar after the collar is attached, it is necessary to keep the propulsion tube in good condition because the drilled hole is usually not a perfect circle but has a jagged cross section. It was difficult to connect.
【０００８】尚、実公平１ー２８１５０号公報には、上
記のような推進管とマンホールとの接続部に使用される
マンホール用継手が記載されており、これによれば接続
部の強度を向上させることができる。しかし、この種の
継手を用いる接続方法では、マンホールの周囲の土を取
り除かないと継手を設置できず、特に推進管の埋設位置
が深い場合には作業が困難なものとなる。従って、この
ようなマンホール専用の継手を使用して推進管とマンホ
ールとを接続する方法は、非開削工法とは言えないもの
である。Furthermore, Utility Model Publication No. 1-28150 describes a manhole joint used for the connection between the propulsion pipe and the manhole as described above, which improves the strength of the connection. can be done. However, with this type of connection method using a joint, the joint cannot be installed unless the soil around the manhole is removed, making the work particularly difficult when the propulsion pipe is buried deep. Therefore, the method of connecting the propulsion pipe and the manhole using such a joint exclusively for manholes cannot be called a trenchless construction method.
【０００９】本発明は、従来における上記のような問題
に対処するもので、カラーを用なくても、また熟練者で
なくても簡単に、しかも確実に推進管と既設人孔とを接
続できる方法を提供することにより、この種の接続作業
の作業性の向上を図ることを目的とする。[0009] The present invention addresses the above-mentioned problems in the prior art, and allows the propulsion pipe and the existing manhole to be easily and reliably connected without using a collar or without being an expert. The present invention aims to improve the workability of this type of connection work by providing a method.
【００１０】0010
【課題を解決するための手段】上記目的達成のため、本
発明は、地中に埋設された推進管と既設の人孔とを接続
する方法において、次のように構成したことを特徴とす
る。[Means for Solving the Problems] In order to achieve the above object, the present invention provides a method for connecting a propulsion pipe buried underground and an existing manhole, characterized by the following configuration. .
【００１１】すなわち、伸縮性を有する材料からなる断
面中空の環状体を用い、人孔に予め設けられた管取り付
け用の斫り穴に上記推進管の接続すべき部分を位置させ
た状態で、その接続すべき部分と斫り穴との間に環状体
を配置し、次いで環状体内に発泡性樹脂を注入して発泡
硬化させることにより、推進管の接続すべき部分と人孔
との間の隙間をシールする。That is, using an annular body made of a stretchable material and having a hollow cross section, the portion to be connected to the propulsion tube is positioned in a pre-drilled hole for attaching the tube to the manhole. An annular body is placed between the part to be connected and the borehole, and then a foamable resin is injected into the annular body and foamed and hardened. Seal the gaps.
【００１２】環状体を構成する材料としては、スチレン
ーブタジエンラバー（ＳＢＲ）、アクリルニトリルーブ
タジエンラバー（ＮＢＲ）等のゴムがよい。また、発泡
性樹脂の注入によって環状体を発泡（膨張）させた時に
、環状体が推進管及び斫り穴周面にそれぞれ確実に密着
するように、環状体の内側及び外側にシールゴムを設け
てもよい。[0012] As the material constituting the annular body, rubbers such as styrene-butadiene rubber (SBR) and acrylonitrile-butadiene rubber (NBR) are preferable. In addition, sealing rubber is provided on the inside and outside of the annular body so that when the annular body is foamed (expanded) by injection of foamable resin, the annular body will firmly adhere to the propulsion tube and the circumferential surface of the borehole. Good too.
【００１３】この種のシールゴムとしては、通常、パイ
プの受口に用いられている加硫されたＳＢＲでもよく、
水膨張性ゴム、シリコンゴム等の一般に用いられるゴム
が使用されるが、斫り穴の形状が真円でないため、クッ
ション性のあるゴムが好ましい。その場合、推進管への
密着に問題のない範囲でシールゴムの内径を推進管の外
径よりも僅かに大きくしておけば、推進管に被せやすく
なる。また、シールゴムの外径は斫り穴の内径よりも所
定量だけ小径とし、環状体の発泡により拡径した時に斫
り穴周面に密着する構成とする。[0013] As this type of seal rubber, vulcanized SBR, which is usually used for pipe sockets, may be used.
Commonly used rubbers such as water-swellable rubber and silicone rubber are used, but since the shape of the drilled hole is not a perfect circle, a rubber with cushioning properties is preferred. In that case, if the inner diameter of the seal rubber is made slightly larger than the outer diameter of the propulsion tube within a range that does not cause problems in adhesion to the propulsion tube, it will be easier to cover the propulsion tube. Further, the outer diameter of the seal rubber is made smaller than the inner diameter of the drilled hole by a predetermined amount, so that when the annular body is expanded by foaming, it comes into close contact with the circumferential surface of the drilled hole.
【００１４】シールゴムの作用をする材料で環状体を構
成すれば、特にシールゴムを用いる必要がないことは勿
論である。一方、発泡性樹脂としては、例えば二液性の
発泡ウレタン樹脂で発泡倍率が約４〜７倍程度のものが
好ましい。Of course, if the annular body is made of a material that acts as a seal rubber, there is no need to use a seal rubber. On the other hand, as the foamable resin, for example, a two-component foamed urethane resin having an expansion ratio of about 4 to 7 times is preferable.
【００１５】発泡性樹脂の一回の注入量は、斫り穴の径
と推進管の接続すべき部分との間の隙間体積を勘案して
決める。環状体への発泡性樹脂の注入は、例えば、専用
の注入ポンプによる加圧注入器を用いて行うことができ
るが、二液性の発泡性樹脂の場合は、これを構成する各
液専用のカートリッジタンクをエア圧縮又はエアシリン
ダにより圧縮させ、注入する方法を用いて行ってもよい
。[0015] The amount of foamable resin injected at one time is determined by taking into account the volume of the gap between the diameter of the drilled hole and the portion to be connected to the propulsion pipe. Injecting the foamable resin into the annular body can be carried out, for example, using a pressurized syringe using a dedicated injection pump, but in the case of a two-component foamable resin, a special injector for each component A method may also be used in which a cartridge tank is compressed with air or an air cylinder and then injected.
【００１６】[0016]
【作用】上記の構成においては、既設人孔の斫り穴と推
進管の接続すべき部分、つまり管端部との間に環状体を
配置した状態で、環状体内に発泡性樹脂を注入して発泡
させることで環状体が膨張し、その結果、環状体の外径
側及び内径側が管端部及び斫り穴周面にそれぞれ圧着す
る。そして、その状態で発泡樹脂が硬化することにより
、推進管の接続すべき管端部と人孔との間の隙間がシー
ルされる。[Operation] In the above configuration, with the annular body placed between the borehole of the existing manhole and the part where the propulsion pipe should be connected, that is, the pipe end, foamed resin is injected into the annular body. By foaming the annular body, the annular body expands, and as a result, the outer diameter side and the inner diameter side of the annular body are crimped to the tube end and the circumferential surface of the bored hole, respectively. Then, by hardening the foamed resin in this state, the gap between the end of the propulsion tube to be connected and the manhole is sealed.
【００１７】この場合において、環状体は上記のように
発泡性樹脂の発泡圧により膨張しながら推進管の管端部
及び斫り穴周面に圧着されるから、斫り穴の形状が真円
でなくても、或いは推進管の管端部と斫り穴周面との間
の隙間が大きくても、それらの間が、発泡硬化物の充填
された環状体によって隙間なく確実に埋められることに
なる。In this case, as described above, the annular body expands due to the foaming pressure of the foaming resin and is pressed against the end of the propulsion tube and the circumferential surface of the borehole, so that the shape of the borehole is a perfect circle. Even if the gap between the tube end of the propulsion tube and the circumferential surface of the drilled hole is large, the gap can be reliably filled without any gap by the annular body filled with the cured foam material. become.
【００１８】従って、上記の構成によれば、環状体を所
定の状態に配置し、その環状体内に発泡性樹脂を注入し
て発泡硬化させるという簡単な作業を行うだけで、推進
管と人孔とを所定の状態に接続することができるので、
推進管の管端部にカラーを装着する作業や、そのカラー
装着時に必要であった管端面のＲカット後のテーパ加工
を全く行う必要がなく、作業性を大幅に向上させること
ができる。Therefore, according to the above structure, the propulsion tube and the manhole can be connected by simply arranging the annular body in a predetermined state, injecting the foamable resin into the annular body, and foaming and hardening it. and can be connected to a predetermined state,
There is no need to attach a collar to the end of the propulsion tube or to perform taper processing after R-cutting the end surface of the tube, which was necessary when attaching the collar, and work efficiency can be greatly improved.
【００１９】言い換えれば、熟練者でなくても簡単に作
業を行うことができ、しかも短時間で既設人孔と推進管
とを接続できることになる。もちろん、人孔の周囲の土
を開削して取り除く作業（いわゆる空ぶせ工程）などは
全く行う必要がない。In other words, even an unskilled person can easily carry out the work, and the existing manhole and propulsion pipe can be connected in a short time. Of course, there is no need to excavate and remove the soil around the manhole (the so-called emptying process).
【００２０】[0020]
【実施例】以下、本発明の実施例を説明する。先ず、本
発明方法を実施するに当たり、推進管を既設の人孔に到
達させるまでの作業について予め説明する。[Examples] Examples of the present invention will be described below. First, in carrying out the method of the present invention, the work required to bring the propulsion pipe to the existing manhole will be explained in advance.
【００２１】先端にオーガー等の掘削機構を備えた掘削
装置によって地中に埋設孔を掘削しながら、これに続け
て強化プラスチック製の推進管（外径６３８ｍｍ×長さ
２４３５ｍｍ）を既設の人孔たるマンホールに向けて推
進機で推進させる。この場合、既設マンホールの到達側
の壁部には、推進管を接続させるべき部分として、略７
３０ｍｍの穴径の斫り穴を予め形成しておく。While excavating an underground hole using a drilling device equipped with an auger or other excavation mechanism at the tip, a reinforced plastic propulsion tube (outer diameter 638 mm x length 2435 mm) was then inserted into the existing manhole. It is propelled by a propulsion device toward the barrel manhole. In this case, the wall on the reaching side of the existing manhole has approximately 70 mm as the part to which the propulsion pipe should be connected.
Drill a hole with a diameter of 30 mm in advance.
【００２２】そして、推進管を所定量だけ推進させた時
点で、その後端にカラー継手を介して同種の推進管を順
次接続し、このようにして最先端部の推進管を既設の人
孔２まで到達させる。その際、推進管の推進方向を適宜
修正しながら、マンホールの斫り穴の周面と最先端部の
推進管の管端部との間に所定の隙間が形成されるように
斫り穴及び管端部の両中心をできるだけ一致させ、更に
既設マンホール内に推進管の管端部を約３０ｃｍほど進
入させた時点で、推進管の推進作業を停止する。[0022] When the propulsion tube has been propelled by a predetermined amount, the same type of propulsion tubes are sequentially connected to the rear end via the collar joint, and in this way, the tip of the propulsion tube is inserted into the existing manhole 2. reach it. At that time, while adjusting the propulsion direction of the propulsion tube as appropriate, drill the hole and When the centers of the tube ends are aligned as much as possible, and the tube end of the propulsion tube has entered about 30 cm into the existing manhole, the propulsion tube propulsion operation is stopped.
【００２３】次に、この状態で、本発明方法によって上
記マンホールと推進管とを接続するのであるが、その場
合、先ず、上述のマンホール内に進入された推進管の管
端部の外周に図１及び図２に示すような環状体１を被せ
て、斫り穴と推進管との間の隙間に配置する。Next, in this state, the above-mentioned manhole and the propulsion pipe are connected by the method of the present invention. An annular body 1 as shown in FIGS. 1 and 2 is placed over the gap between the bored hole and the propulsion tube.
【００２４】この環状体１は、図例では中空部１ａを有
する伸縮可能なチューブ状のゴムによって構成されてお
り、その所定位置に発泡性樹脂注入用の注入口１ｂが設
けられている。また、環状体１には、その外径側及び内
径側に既設マンホールの壁部の肉厚（２５０ｍｍ）に相
当する幅を有するシールゴム２、３がそれぞれ備えられ
ている。尚、環状体１を推進管の管端部に嵌め込む際は
環状体中空部１ａには何も充填されていないため容易に
装着できる。[0024] In the illustrated example, the annular body 1 is made of a stretchable rubber tube having a hollow portion 1a, and an injection port 1b for injecting the foamable resin is provided at a predetermined position. Further, the annular body 1 is provided with seal rubbers 2 and 3 having a width corresponding to the wall thickness of the existing manhole (250 mm) on the outer diameter side and the inner diameter side, respectively. Incidentally, when fitting the annular body 1 into the tube end portion of the propulsion tube, the annular body hollow portion 1a is not filled with anything, so that the annular body 1 can be easily attached.
【００２５】次いで、上記のように環状体１を所定位置
に配置した状態で、図３に示すように、地上の注入ポン
プ５によって下記主剤（Ａ液）と硬化剤（Ｂ液）とが所
定割合に混合加圧され、注入ポンプ５に接続された加圧
注入器６によって、その注入口１ｂから中空部１ａ内に
発泡性樹脂４を注入して充填し、中空部１ａ内で発泡硬
化させる。Next, with the annular body 1 placed at a predetermined position as described above, as shown in FIG. The foamable resin 4 is mixed and pressurized in a proportion, and is injected and filled into the hollow part 1a from the injection port 1b using a pressurizing injector 6 connected to the injection pump 5, and is foamed and hardened in the hollow part 1a. .
【００２６】この場合において、符号７で示す部分は推
進管、符号８で示す部分はマンホール、符号８ａで示す
部分は斫り穴である。また、５ａはＡ液のタンク、５ｂ
はＢ液のタンクを示す。In this case, the portion designated by numeral 7 is a propulsion pipe, the portion designated by numeral 8 is a manhole, and the portion designated by numeral 8a is a bored hole. Also, 5a is a tank for liquid A, 5b
indicates the B liquid tank.
【００２７】また、上記発泡性樹脂４の組成及びその発
泡硬化物の基本特性は、表１及び表２にそれぞれ示す通
りである。The composition of the foamable resin 4 and the basic properties of the foamed cured product are shown in Tables 1 and 2, respectively.
【００２８】[0028]
【表１】[Table 1]
【００２９】[0029]
【表２】
表１に示すように、本実施例で使用した発泡性樹脂４は
、二液性の発泡ウレタン樹脂（東海ゴム製：商品名「セ
ルシーラＳ」）であり、その発泡硬化物の発泡倍率は、
表２に示すように約４倍、発泡時間は常温で約５分であ
る。また、発泡性樹脂４の一回の注入量については、斫
り穴８ａと推進管７との間の隙間体積を勘案して約７ｋ
ｇとし、Ａ液（主剤ポリオール）とＢ液（硬化剤イソシ
アネート）の比率を重量比で１：１．４にした。[Table 2] As shown in Table 1, the foamable resin 4 used in this example is a two-component foamed urethane resin (manufactured by Tokai Rubber Co., Ltd., trade name "Cell Seala S"), and its foamed cured product is The foaming ratio is
As shown in Table 2, the foaming time is about 4 times, and the foaming time is about 5 minutes at room temperature. In addition, the amount of foamable resin 4 injected at one time is approximately 7k, taking into account the volume of the gap between the drilled hole 8a and the propulsion pipe 7.
g, and the ratio of liquid A (base polyol) to liquid B (curing agent isocyanate) was 1:1.4 by weight.
【００３０】尚、この発泡性樹脂４の発泡時における発
熱量は少ないため、環状体１、シールゴム２、３及び推
進管７を軟化させることはない。また、反応の立ち上が
り速度が速いため、短時間で発泡が開始（注入充填後、
１分で反応が開始）し、５分後には反応が終了する。更
に、環状体１の片膨れを防止するために既設マンホール
８側に当て板等を用いる必要もなかった。Furthermore, since the amount of heat generated during foaming of the foamable resin 4 is small, the annular body 1, the seal rubbers 2 and 3, and the propulsion tube 7 are not softened. In addition, because the reaction start-up speed is fast, foaming starts in a short time (after injection and filling,
The reaction starts in 1 minute) and ends in 5 minutes. Further, there is no need to use a patch plate or the like on the existing manhole 8 side to prevent the annular body 1 from bulging on one side.
【００３１】環状体１の中空部１ａ内で発泡性樹脂４の
発泡が開始すると、その発泡圧により環状体１が膨張す
る。この時、環状体１においては、発泡前に比べると外
径は大きく、内径は小さくなる。その結果、図４に示す
ように、環状体１の内径側及び外径側はシールゴム３及
び２を介して推進管７の外面及び斫り穴８ａの周面に強
固にそれぞれ圧着される。When foaming of the foamable resin 4 starts within the hollow portion 1a of the annular body 1, the annular body 1 expands due to the foaming pressure. At this time, the annular body 1 has a larger outer diameter and a smaller inner diameter than before foaming. As a result, as shown in FIG. 4, the inner and outer diameter sides of the annular body 1 are firmly pressed to the outer surface of the propulsion tube 7 and the circumferential surface of the bored hole 8a via the seal rubbers 3 and 2, respectively.
【００３２】そして、この状態で発泡性樹脂４の発泡が
終了して硬化することにより、図５に拡大して示すよう
に、推進管７の外面と斫り穴８ａの周面との間が環状体
１及びシールゴム２、３によって隙間なく埋められた状
態でシールされる。In this state, when the foaming of the foamable resin 4 is completed and hardened, the gap between the outer surface of the propulsion tube 7 and the circumferential surface of the bored hole 8a is increased, as shown in an enlarged view in FIG. The annular body 1 and the seal rubbers 2 and 3 are sealed with no gaps.
【００３３】このような方法によれば、斫り穴の形状が
真円でなくても、或いは推進管７の管端部と斫り穴８ａ
の周面との間の隙間が大きくても、その隙間に環状体を
配置した後、その中空部１ａ内に発泡性樹脂４を注入し
て発泡硬化させるという簡単な作業を行うだけで、それ
らの間を環状体１及び内部の発泡硬化物によって隙間な
く充分に埋めることができて、推進管７とマンホール８
とを所定の状態に接続することができる。According to such a method, even if the shape of the drilled hole is not a perfect circle, or even if the shape of the drilled hole is not a perfect circle, or the tube end of the propulsion tube 7 and the drilled hole 8a
Even if the gap between the annular body and the circumferential surface of The space between the annular body 1 and the cured foam inside can be sufficiently filled without any gaps, and the propulsion pipe 7 and the manhole 8
and can be connected to a predetermined state.
【００３４】これにより、推進管７の管端部にカラーを
装着する作業や、そのカラー装着時に必要であったＲカ
ット後のテーパ加工を行わなくても済むこととなり、作
業性を大幅に向上させることができる。従って、熟練者
でなくても簡単に作業を行うことができ、しかも短時間
でマンホール８と推進管７とを接続できることになる。
もちろん、マンホール８の周囲の土を開削して取り除く
作業（いわゆる空ぶせ工程）などは全く行う必要がない
。[0034] This eliminates the need to attach a collar to the end of the propulsion tube 7 and the taper processing after R-cutting that was necessary when attaching the collar, greatly improving work efficiency. can be done. Therefore, even an unskilled person can easily carry out the work, and moreover, the manhole 8 and the propulsion pipe 7 can be connected in a short time. Of course, there is no need to excavate and remove the soil around the manhole 8 (so-called emptying process).
【００３５】更に、本実施例で使用した環状体１は構造
が簡単で耐食性も良く、しかも安価に製作できるという
利点がある。一方、発泡性樹脂４は低発泡タイプであり
、その発泡固形物も実用上十分な強度を有し、しかも吸
水率が少ない。従って、長期にわたって安定した性能を
保持することができ、発泡硬化後に収縮することもない
。Furthermore, the annular body 1 used in this embodiment has the advantage of having a simple structure, good corrosion resistance, and can be manufactured at low cost. On the other hand, the foamable resin 4 is of a low foaming type, and its foamed solid material also has sufficient strength for practical use and has a low water absorption rate. Therefore, stable performance can be maintained over a long period of time, and there is no shrinkage after foaming and curing.
【００３６】ここで、推進管と人孔（マンホール）との
接続作業に要する時間について、本発明方法による場合
と従来法による場合とを比較してみた。従来法は、推進
管到達後、余分に推進した管をＲカットし、カット面は
サンダーによりテーパ加工を管全周にわたって施した後
、専用のカラーを差し込み、斫り穴との間隙にエポキシ
系樹脂モルタルを手詰め充填する方法であるが、一箇所
当たりの作業時間は全部で３時間で、そのうちＲカット
部のテーパ加工が約１時間要した。また、テーパ加工が
既設人孔内で行うため充分には行えず、カラー装着に多
大な時間を要した。[0036] Here, a comparison was made between the method of the present invention and the conventional method regarding the time required for the connection work between the propulsion pipe and the manhole. In the conventional method, after reaching the propulsion tube, the extra propelled tube is R-cut, the cut surface is tapered with a sander around the entire circumference of the tube, a special collar is inserted, and an epoxy resin is applied to the gap with the drilled hole. This method involved hand-filling with resin mortar, and the working time for each location was 3 hours in total, of which approximately 1 hour was required for tapering the R-cut portion. In addition, since the taper process was carried out inside the existing manhole, it could not be performed satisfactorily, and it took a lot of time to attach the collar.
【００３７】これに対して、本発明方法によれば、Ｒカ
ット部のテーパ加工が不要のため大幅に時間短縮され、
一箇所当たりの作業時間は約１時間で終了した。これら
の作業時間の比較結果を表３に示す。On the other hand, according to the method of the present invention, there is no need to taper the R-cut portion, so the time is significantly shortened.
The work took about 1 hour to complete each location. Table 3 shows the comparison results of these working times.
【００３８】[0038]
【表３】
次に、本発明方法による場合及び従来法による場合
の各々について、仕上がり後の推進管とマンホールとの
接続部の曲げ強度試験を行った。[Table 3] Next, a bending strength test was conducted on the joint between the propulsion pipe and the manhole after finishing, using the method of the present invention and the conventional method.
【００３９】試験方法は、図６に示すように、マンホー
ルの壁部の厚みに相当するコンクリート２０に斫り穴２
０ａをあけ、その穴２０ａにそれぞれ従来法及び本発明
方法で推進管２１を固定させ、アングルフレーム２２に
取り付けられたロードセル２３によって推進管２１の上
部から矢印Ａの方向に載荷板２４を介して荷重を加える
ことにより行った。そして、その荷重と推進管２１の撓
み或いは破損の状況との関係を調べた。その結果を表４
に示す。The test method is as shown in FIG.
0a, the propulsion tube 21 is fixed in the hole 20a by the conventional method and the method of the present invention, and the load cell 23 attached to the angle frame 22 is used to move the propulsion tube 21 from the top in the direction of arrow A through the loading plate 24. This was done by applying a load. Then, the relationship between the load and the state of deflection or damage of the propulsion tube 21 was investigated. Table 4 shows the results.
Shown below.
【００４０】[0040]
【表４】
この表４に示すように、上記試験の結果、推進管が
、強化プラスチック管（ガラス繊維強化複合管）である
場合及び推進用ヒューム管である場合のいずれにおいて
も、管とマンホールとの接続部について、本発明方法に
よっても従来法による場合と同等か若しくはそれ以上の
強度が得られることが判明した。これにより、本発明方
法によって接続された部分の強度は、実用上も問題がな
いことが確認された。[Table 4] As shown in Table 4, as a result of the above test, whether the propulsion tube is a reinforced plastic tube (glass fiber reinforced composite tube) or a propulsion fume tube, the tube and manhole It has been found that the method of the present invention can provide a strength equal to or greater than that of the conventional method with respect to the connection portion. This confirmed that the strength of the parts connected by the method of the present invention poses no practical problems.
【００４１】[0041]
【発明の効果】以上のように本発明方法によれば、環状
体を既設人孔と推進管との接続部に使用することで、カ
ラーを用なくても、また熟練者でなくても簡単且つ確実
に推進管と既設人孔とを接続することができ、この種の
接続作業における作業性を従来に比べて大幅に向上させ
ることができる。[Effects of the Invention] As described above, according to the method of the present invention, by using the annular body at the connection part between the existing manhole and the propulsion pipe, it is easy to use without using a collar or without being an expert. Moreover, the propulsion pipe and the existing manhole can be reliably connected, and the workability in this type of connection work can be greatly improved compared to the conventional method.
【図１】本発明の実施例で使用した環状体の正面図であ
る。FIG. 1 is a front view of an annular body used in an example of the present invention.
【図２】図１のＩＩーＩＩ線で切断した断面図である。FIG. 2 is a sectional view taken along line II-II in FIG. 1;
【図３】既設人孔（既設マンホール）に推進管を挿入し
て、その隙間に環状体を配置した状態で中空部内に発泡
性樹脂を注入している状態を示す上記実施例における一
工程図である。[Fig. 3] A process diagram of the above embodiment showing a state in which a propulsion pipe is inserted into an existing manhole (existing manhole) and foamed resin is injected into the hollow part with an annular body placed in the gap. It is.
【図４】上記発泡性樹脂の発泡により環状体が膨張して
推進管と既設人孔（既設マンホール）との間の隙間がシ
ールされた状態を示す工程図である。FIG. 4 is a process diagram showing a state in which the annular body expands due to the foaming of the foamable resin and the gap between the propulsion pipe and the existing manhole is sealed.
【図５】図４の要部を拡大して示す拡大図である。FIG. 5 is an enlarged view showing the main part of FIG. 4;
【図６】本発明方法で得られたマンホール接続部の強度
を調べるため、その曲げ強度試験において使用した試験
装置の概略説明図である。FIG. 6 is a schematic explanatory diagram of a testing device used in a bending strength test to examine the strength of a manhole connection obtained by the method of the present invention.
１・・・環状体、
４・・・発泡性樹脂、
７・・・推進管、
８・・・既設人孔（既設マンホール）、８ａ・・・斫り
穴。DESCRIPTION OF SYMBOLS 1... Annular body, 4... Foaming resin, 7... Propulsion pipe, 8... Existing manhole (existing manhole), 8a... Digging hole.
Claims (1)
とを接続するに当たり、伸縮性を有する材料からなる断
面中空の環状体を用い、人孔に予め設けられた管取り付
け用の斫り穴に上記推進管の接続すべき部分を位置させ
た状態で、その接続すべき部分と斫り穴との間に環状体
を配置し、次いで環状体内に発泡性樹脂を注入して発泡
硬化させることにより、推進管の接続すべき部分と人孔
との間の隙間をシールすることを特徴とする推進管と既
設人孔との接続方法。Claim 1: When connecting a propulsion pipe buried underground to an existing manhole, a ring-shaped body with a hollow cross section made of a stretchable material is used to connect a pipe installed in advance in the manhole. With the part of the propulsion pipe to be connected in the drilled hole positioned, an annular body is placed between the part to be connected and the bored hole, and then a foamable resin is injected into the annular body to form foam. A method for connecting a propulsion pipe and an existing manhole, characterized by sealing a gap between a part of the propulsion pipe to be connected and the manhole by curing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3101498A JPH04333722A (en) | 1991-05-07 | 1991-05-07 | Method for jointing propeller pipe and existent man-hole to each other |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3101498A JPH04333722A (en) | 1991-05-07 | 1991-05-07 | Method for jointing propeller pipe and existent man-hole to each other |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04333722A true JPH04333722A (en) | 1992-11-20 |
Family
ID=14302305
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3101498A Pending JPH04333722A (en) | 1991-05-07 | 1991-05-07 | Method for jointing propeller pipe and existent man-hole to each other |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04333722A (en) |
-
1991
- 1991-05-07 JP JP3101498A patent/JPH04333722A/en active Pending
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