JP5161948B2 - Promotion method - Google Patents

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JP5161948B2
JP5161948B2 JP2010240653A JP2010240653A JP5161948B2 JP 5161948 B2 JP5161948 B2 JP 5161948B2 JP 2010240653 A JP2010240653 A JP 2010240653A JP 2010240653 A JP2010240653 A JP 2010240653A JP 5161948 B2 JP5161948 B2 JP 5161948B2
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propulsion
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injection hole
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紀男 黒岩
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株式会社コーアエンジニアリング
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本発明は、地表を掘削せずに地中を掘削貫通して管路を構築する技術に係わり、特にネジ蓋を備えた推進管を地中に好適に埋設するための推進工法に関する。 The present invention relates to a technique for constructing a pipeline by excavating through the ground without excavating the ground surface, and particularly relates to a propulsion method for suitably embedding a propulsion pipe having a screw lid in the ground.

従来、地中に下水道その他の管路を構築するための管渠の埋設方法として、地表を筋掘りしてその底面に既製の管を敷設してから埋め戻す開削工法と、地表を掘削することなく地中を掘削貫通する非開削工法とが知られる。   Traditionally, as a method of burying pipes to construct sewers and other pipes in the ground, excavating the ground surface and excavating the ground surface by digging the ground surface and laying a ready-made pipe on the bottom It is also known as a non-open cutting method that excavates and penetrates the ground.

非開削工法には、地中を掘進機により掘進しながら、その後方でセグメントを組み立てて内面を覆工材により仕上げるシールド工法と、推進管と呼ばれる既製の管（ヒューム管、鋼管、ダクタイル管、二重構造鋼管、ボックスカルバートなど）を地中に押し込む推進工法とがある。   The non-open cutting method includes a shield method that digs the ground with a digging machine, assembles segments behind it and finishes the inner surface with a lining material, and a pre-made pipe called a propulsion pipe (fume pipe, steel pipe, ductile pipe, There is a propulsion method that pushes double-structure steel pipes, box culverts, etc.) into the ground.

このうち、推進工法は、管路の両端となる位置に立抗（発進立抗／到達立抗）を掘り、発進立抗から掘進機と推進管とをジャッキで地中に押し込み、掘進機の後続に推進管を順次継ぎ足し、以って発進立抗から到達立抗まで推進管が連なった管路を地中に構築するというものである。   Of these, the propulsion method digs a resisting (starting resisting / reaching resisting) at both ends of the pipeline, pushes the excavator and the propelling pipe into the ground with a jack from the starting resist, After that, propulsion pipes are added one after another, so that a pipe line connecting the propulsion pipes from the start to the end is built in the ground.

ここに、掘進機は、前端部にカッターヘッドを有し、そのカッターヘッドにより後続の掘進機本体や推進管の直径より大きい掘削抗を掘り進めるところ、推進管の管壁には雌ネジ部を有する薬剤注入孔が開口され、その薬剤注入孔を通じて掘削抗の内周と推進管の外周との間の空隙に推進管の内側から所定の薬剤が注入される（特許文献１）。   Here, the excavator has a cutter head at the front end, and the cutter head advances a drilling resistance larger than the diameter of the subsequent excavator main body and the propulsion pipe. A drug injection hole is opened, and a predetermined drug is injected from the inside of the propulsion pipe into the space between the inner periphery of the drilling anti-tube and the outer periphery of the propulsion pipe through the drug injection hole (Patent Document 1).

例えば、上記空隙には、薬剤として掘進機や推進管の推進抵抗を軽減するべく潤滑剤を注入したり、掘進機が到達立抗に達した段階で上記空隙を完全に埋めるべく硬化性の樹脂、セメントペースト、又はセメントモルタルといったグラウト剤（裏込め剤）を充填注入したりする。尚、図９に示すように、薬剤注入孔Ｈ内には、通例として薬剤の逆流を防止するべく逆止弁Ｖが取り付けられる。   For example, a lubricant is injected into the gap as a chemical agent to reduce the propulsion resistance of the excavator or the propelling pipe, or a curable resin is used to completely fill the gap when the excavator reaches the ultimate resistance. Grouting agent (backfilling agent) such as cement paste or cement mortar. As shown in FIG. 9, a check valve V is usually installed in the drug injection hole H in order to prevent the drug backflow.

特開平１１−２５６９８８号公報Japanese Patent Application Laid-Open No. 11-256988

しかしながら、従来の推進工法によれば、図９(ａ)のように推進管Ｐが掘削抗Ｔ内を進行するとき、薬剤注入孔Ｈの外側開口縁に石Ｓが激突して掘進機の進行の妨げになることがあった。又、石Ｓの激突により、図９(ｂ)のように薬剤注入孔Ｈの周辺が変形したり砕けたりして耐圧性、水密性に支障を来たしてしまうという問題があった。   However, according to the conventional propulsion method, when the propulsion pipe P advances in the excavation anti-T as shown in FIG. 9A, the stone S collides with the outer opening edge of the drug injection hole H, and the advancement of the excavation machine proceeds. It could be an obstacle. In addition, there is a problem that the pressure S and water tightness are hindered due to the collision of the stone S, as shown in FIG.

特に、推進管Ｐとして多用されるヒューム管（遠心力鉄筋コンクリート管）では、その内部まで達する亀裂が広範囲に広がって補修を余儀なくされることがあるが、ヒューム管は遠心力により締め固められた高強度で水密性に優れたＰＣコンクリート製であるから、亀裂が生じた部分を補修してもヒューム管本来の高強度、高水密性を回復することはできない。   In particular, in a fume pipe (centrifugal reinforced concrete pipe) often used as the propulsion pipe P, cracks reaching the inside of the fume pipe may spread over a wide area and may be repaired. However, the fume pipe is highly compacted by centrifugal force. Since it is made of PC concrete that is strong and excellent in water tightness, the original high strength and high water tightness of the fume tube cannot be recovered even if the cracked portion is repaired.

本発明は以上のような事情に鑑みて成されたものであり、その目的は掘進機により掘り進まれた掘削抗内での土石による推進管の変形、破壊を防止しながら、その推進管が掘削抗内を円滑に進行し得るようにすることにある。   The present invention has been made in view of the circumstances as described above. The purpose of the present invention is to prevent the propulsion pipe from being deformed or broken by the debris in the excavation shaft dug by the excavator. It is to be able to proceed smoothly in the drilling hole.

本発明は上記目的を達成するため、管壁に雌ネジ部を有する薬剤注入孔が開口された推進管を掘進機の後部に連結し、前記掘進機とその後続に順次継ぎ足される推進管とをジャッキで押圧して地中に進入させることにより、前記推進管による管路を地中に構築する推進工法において、
所定の開口面積を有する吐出口と、前記薬剤注入孔の雌ネジ部に対応する雄ネジ部とが形成された円筒状の胴部の一端に、端板部を備えた断面凹字形のネジ蓋を用い、
前記推進管を地中に進入させる前に、前記ネジ蓋を前記雌ネジ部と前記雄ネジ部との結合により前記推進管の外側から前記薬剤注入孔に装着し、前記端板部を前記推進管の外周側で前記薬剤注入孔の開口端に位置付け、
前記推進管を地中に進入させた後、当該推進管の内側から前記薬剤注入孔と前記ネジ蓋の吐出口とを通じて、前記掘進機により掘り進まれた掘削抗の内周と前記推進管の外周との間の空隙に薬剤を供給することを特徴とする推進工法を提供するものである。 Since the present invention is to achieve the above object, a drug infusion holes propulsion tube having an opening with a female screw portion in the tube wall is connected to the rear of the excavator, the propulsion tube to be sequentially spliced to the excavator to its successor In the propulsion method of constructing a pipe line by the propulsion pipe in the ground by pressing it with a jack and making it enter the ground,
A screw cap having a concave cross section provided with an end plate at one end of a cylindrical body portion in which a discharge port having a predetermined opening area and a male screw portion corresponding to the female screw portion of the drug injection hole are formed. Use
Before the propulsion tube enters the ground, the screw lid is attached to the drug injection hole from the outside of the propulsion tube by coupling the female screw portion and the male screw portion, and the end plate portion is propelled. Positioned at the open end of the drug injection hole on the outer periphery side of the tube,
After allowing the propulsion pipe to enter the ground, the inner circumference of the excavation resistor digged by the excavator through the drug injection hole and the discharge port of the screw lid from the inside of the propulsion pipe and the propulsion pipe The present invention provides a propulsion method characterized by supplying a drug into a gap between the outer periphery.

本発明に係る推進工法では、所定の開口面積を有する吐出口と、推進管の管壁に開口された薬剤注入孔の雌ネジ部に対応する雄ネジ部とが形成された円筒状の胴部の一端に、端板部を備えた断面凹字形のネジ蓋を用い、推進管を地中に進入させる前に、ネジ蓋を雌ネジ部と雄ネジ部との結合により推進管の外側から薬剤注入孔に装着して、端板部を推進管の外周側で薬剤注入孔の開口端に位置付けるようにしていることから、掘進機により掘り進められた掘削抗内を推進管が進行するとき、掘削抗内の石が薬剤注入孔の外側開口縁に食い込んで推進管の進行を妨げることが防止されるため、推進管の進行を円滑にすることができる。 In the propulsion method according to the present invention, a cylindrical body portion in which a discharge port having a predetermined opening area and a male screw portion corresponding to the female screw portion of the drug injection hole opened in the tube wall of the propulsion tube are formed. Using a screw cap with a concave cross section with an end plate at one end of the screw, before the propelling tube enters the ground, the screw cap is connected from the outside of the propelling tube by coupling the female screw portion and the male screw portion. Since it is attached to the injection hole and the end plate portion is positioned at the opening end of the drug injection hole on the outer peripheral side of the propulsion pipe, when the propulsion pipe advances through the excavation tunnel digged by the excavator, It is possible to prevent the stone in the excavation shaft from biting into the outer opening edge of the drug injection hole and hindering the progress of the propulsion tube.

しかも、薬剤注入孔の周辺が石の激突によって破壊されることを防止できるので、推進管を変形、破壊のない状態で地中に埋設することが可能となる。   In addition, since the periphery of the drug injection hole can be prevented from being destroyed by a stone crash, the propulsion pipe can be buried in the ground without being deformed or destroyed.

本発明に係る推進工法を示す説明図Explanatory drawing showing the propulsion method according to the present invention 本発明で用いる推進管の一例を示す斜視概略図Schematic perspective view showing an example of a propelling pipe used in the present invention 図２に示した推進管の軸線に沿う部分断面図であり、（ａ）は薬剤注入孔の部分を示す縦断面図、（ｂ）は薬剤注入孔にネジ蓋を装着した状態を示す縦断面図FIG. 3 is a partial cross-sectional view along the axis of the propelling tube shown in FIG. 2, (a) is a vertical cross-sectional view showing a portion of a drug injection hole, and (b) is a vertical cross-section showing a state where a screw lid is attached to the drug injection hole. Figure 本発明で用いるネジ蓋を示す斜視図The perspective view which shows the screw cover used by this invention 図４に示したネジ蓋の平面図Plan view of the screw cap shown in FIG. 本発明で用いるネジ蓋とその締結用工具を示す斜視図The perspective view which shows the screw lid used by this invention , and its fastening tool 本発明で用いるネジ蓋付き推進管を地中に埋設するときの状態を示す要部断面図Cross-sectional view of relevant parts showing a state when a propulsion pipe with a screw lid used in the present invention is buried in the ground 本発明で用いるネジ蓋付き推進管を用いて構築された管路の部分断面図Partial sectional view of a pipe constructed using a propelling pipe with a screw lid used in the present invention 従来法により推進管が地中に埋設される状態を示す説明図Explanatory drawing showing the state where the propulsion pipe is buried in the ground by the conventional method

以下、図面に基づいて本発明を詳しく説明する。先ず、図１により、地中に管路を構築する推進工法について概説すると、１は管路を構築するための掘進開始端となる位置を掘り下げた発進立抗、２は掘進終了端となる位置を掘り下げた到達立抗であり、このうち発進立抗１内には、複動形のジャッキ３（油圧ジャッキ）が設置され、そのジャッキ３により掘進機Ｍとその後部に連結した推進管４とが到達立抗２に向けて地中に押し込まれる構成とされる。特に、推進管４はクレーン５により地上から発進立抗１内に降ろされて掘進機Ｍの後続に順次継ぎ足され、その継ぎ足しと押し込みが繰り返される。   Hereinafter, the present invention will be described in detail with reference to the drawings. First, referring to FIG. 1, the propulsion method for constructing a pipeline in the ground will be outlined. 1 is a start-up resistance that digs down a position to be an excavation start end for constructing a pipeline, and 2 is a position to be an end excavation end. A double-acting jack 3 (hydraulic jack) is installed in the start-up resistance 1, and a propulsion pipe 4 connected to the excavator M and its rear part by the jack 3. Is configured to be pushed into the ground toward the ultimate resistance 2. In particular, the propulsion pipe 4 is lowered from the ground into the starter 1 by the crane 5 and sequentially added to the succeeding of the excavating machine M, and the addition and pushing are repeated.

掘進機Ｍは、モータなどを内蔵した円筒形の掘進機本体Ｍ１の前端にカッターヘッドＭ２を備えた公知の装置であり、そのカッターヘッドＭ２には回転駆動する超硬ビットなどが設けられている。そして、係る掘進機Ｍは、ジャッキ３から推進管４を介して背圧（推進力）を受けながら地中を掘り進み、これによって掘り進まれた掘削抗Ｔ内を後続の推進管４が進行し、先頭の掘進機Ｍが到達立抗２まで達すると、その掘進機Ｍが地上からクレーン５により吊り上げられて回収され、発進立抗１と到達立抗２との間には推進管４が連なった管路が構築されることとなる。   The excavator M is a known device having a cutter head M2 at the front end of a cylindrical excavator main body M1 with a built-in motor and the like. The cutter head M2 is provided with a carbide bit that is rotationally driven. . Then, the excavating machine M digs in the ground while receiving back pressure (propulsive force) from the jack 3 via the propulsion pipe 4, and the subsequent propulsion pipe 4 advances in the excavation anti-T thus dug. When the leading excavator M reaches the reaching resistance 2, the excavating machine M is lifted from the ground by the crane 5 and collected, and the propulsion pipe 4 is provided between the starting resistance 1 and the reaching resistance 2. A continuous pipeline will be constructed.

図２は、上記のような推進工法に用いられる推進管を示す。図２において、係る推進管４は口径８００ｍｍ、長さ２４３０ｍｍのヒューム管（遠心力鉄筋コンクリート管）であり、その管壁には所定の間隔を隔てて２つの薬剤注入孔４１が開口されている。その薬剤注入孔４１は、掘進機により掘り進められた掘削抗の内周と推進管の外周との間の空隙に対し、推進管４の内側から所定の薬剤を注入するためのものであるが、これは図１のようにクレーン５による吊下げ用孔としても利用される。尚、図１において、５１は薬剤注入孔４１に装着した雄ネジ部材、５２は雄ネジ部材５１に連結した吊桁であり、その吊桁５２の中央部とクレーン５のフックがワイヤ５３により繋がれている。   FIG. 2 shows a propulsion pipe used in the propulsion method as described above. In FIG. 2, the propulsion tube 4 is a fume tube (centrifugal reinforced concrete tube) having a diameter of 800 mm and a length of 2430 mm, and two drug injection holes 41 are opened at predetermined intervals on the tube wall. The drug injection hole 41 is for injecting a predetermined drug from the inside of the propulsion pipe 4 into the gap between the inner periphery of the excavation resist and the outer periphery of the propulsion pipe dug by the excavator. This is also used as a hole for suspending by the crane 5 as shown in FIG. In FIG. 1, 51 is a male screw member attached to the drug injection hole 41, 52 is a hanging girder connected to the male screw member 51, and the central part of the hanging girder 52 and the hook of the crane 5 are connected by a wire 53. It is.

次に、図３は薬剤注入孔の部分の断面を示す。この図から明らかなように、推進管４の管壁にはナット部材Ｎが埋め込まれており、そのナット部材Ｎの内側が薬剤注入孔４１として開口されている。薬剤注入孔４１は、推進管４の内部に開口するナット部材Ｎの内周（雌ネジ部４１ａ）に連通して、推進管４の外周側をテーパ部４１ｂとして外部に開放した貫通孔であり、その雌ネジ部４１ａには推進管４の内側から逆止弁Ｖが装着され、逆止弁Ｖよりも外周側には金属製のネジ蓋６が装着される。尚、逆止弁Ｖは推進管４内への薬剤の逆流や地下水の流入を防止するためのものであり、その弁体Ｖ１を支持する弁座Ｖ２の外周には雌ネジ部４１ａと結合する雄ネジ部が形成されている。   Next, FIG. 3 shows a cross section of the drug injection hole. As is clear from this figure, a nut member N is embedded in the tube wall of the propelling tube 4, and the inside of the nut member N is opened as a drug injection hole 41. The drug injection hole 41 is a through-hole that communicates with the inner periphery (female screw portion 41a) of the nut member N that opens inside the propelling tube 4 and opens to the outside with the outer peripheral side of the propelling tube 4 as a tapered portion 41b. A check valve V is attached to the female screw portion 41a from the inside of the propulsion pipe 4, and a metal screw lid 6 is attached to the outer peripheral side of the check valve V. The check valve V is used to prevent the backflow of the medicine into the propelling tube 4 and the inflow of groundwater, and is coupled to the outer periphery of the valve seat V2 that supports the valve body V1 with the female screw portion 41a. A male thread portion is formed.

一方、ネジ蓋６は、円筒形の胴部６１と当該胴部の一端を塞ぐ端板部６２とを有した断面凹字形の部材であり、端板部６２が無い胴部６１の他端側（開口側）の外周には、雌ネジ部４１ａに結合する雄ネジ部６１ａが形成されている。又、胴部６１には、端板部６２と雄ネジ部６１ａとの間において所定の開口面積（本例において４ｃｍ２程度）を有する横長の吐出口６１ｂが形成され、その吐出口６１ｂから薬剤を流出させ得るようになっている。 On the other hand, the screw lid 6 is a member having a concave cross section having a cylindrical body portion 61 and an end plate portion 62 that closes one end of the body portion, and the other end side of the body portion 61 without the end plate portion 62. On the outer periphery of the (opening side), a male screw portion 61a that is coupled to the female screw portion 41a is formed. Further, the body portion 61 is formed with a horizontally long discharge port 61b having a predetermined opening area (about 4 cm 2 in this example) between the end plate portion 62 and the male screw portion 61a. Can be spilled.

特に、係るネジ蓋６は、推進管４の外周側で端板部６２が薬剤注入孔４１の開口端（外側開口端）に位置付くようにして薬剤注入孔４１に装着され、その状態において薬剤注入孔４１のテーパ部４１ｂの周面部に吐出口６１ｂが臨むような構成とされている。   In particular, the screw cap 6 is attached to the drug injection hole 41 so that the end plate portion 62 is positioned at the opening end (outer opening end) of the drug injection hole 41 on the outer peripheral side of the propelling tube 4. The discharge port 61 b faces the peripheral surface portion of the tapered portion 41 b of the injection hole 41.

尚、本例において、ネジ蓋６を構成する胴部６１と端板部６２は溶接により接合一体化されているが、その両者を金属材料から一体に形成することもできる。   In addition, in this example, although the trunk | drum 61 and the end plate part 62 which comprise the screw cover 6 are joined and integrated by welding, both can also be integrally formed from a metal material.

又、図４および図５から明らかなように、本発明で用いるネジ蓋６において、端板部６２の周縁３箇所には半円状の切欠部６２ａが周方向に等間隔で形成されており、その各切欠部６２ａを利用して、上記薬剤注入孔４１に対するネジ蓋６の締結装着が行われる構成としてある。 As apparent from FIGS. 4 and 5 , in the screw lid 6 used in the present invention , semicircular cutout portions 62 a are formed at equal intervals in the circumferential direction at three peripheral edges of the end plate portion 62. The screw lid 6 is fastened and attached to the drug injection hole 41 by using the notches 62a.

図６は薬剤注入孔にネジ蓋を締結するための工具を示す。係る工具７は、Ｔ字形をなす手回し用のハンドル７１と、ハンドル７１の下端に固着された円筒形の工具本体７２とを有し、その工具本体７２にはネジ蓋６の切欠部６２ａに対応する円柱状の爪７２ａが形成されている。そして、係る工具７によれば、ネジ蓋６の切欠部６２ａに爪７２ａを係止し、その状態でハンドル７１を回すことにより、上記薬剤注入孔４１に対して推進管４の外側からネジ蓋６を容易かつ迅速に装着することができる。   FIG. 6 shows a tool for fastening a screw lid to the drug injection hole. The tool 7 has a handle 71 for turning in a T shape and a cylindrical tool body 72 fixed to the lower end of the handle 71, and the tool body 72 corresponds to the notch 62 a of the screw lid 6. A cylindrical claw 72a is formed. According to the tool 7, the claw 72 a is locked to the notch 62 a of the screw lid 6, and the handle 71 is rotated in this state, whereby the screw lid is formed on the drug injection hole 41 from the outside of the propelling tube 4. 6 can be mounted easily and quickly.

ここで、先に概説した推進工法により、推進管４による管路を地中に構築するには、図１に示した発進立抗１から推進管４をジャッキ３による押圧力で地中に進入させる前に、当該推進管４の薬剤注入孔４１に対し、図３(ｂ)のようにネジ蓋６を雌ネジ部４１ａと雄ネジ部６１ａとの結合により推進管４の外側から薬剤注入孔４１に装着し、ネジ蓋６の端板部６２を推進管４の外周側で薬剤注入孔４１の開口端に位置付けておく。又、図７のように、薬剤注入孔４１には、推進管４の内側から逆止弁Ｖを装着するほか、薬剤給送管８の一端を接続しておく。   Here, in order to construct a pipe line by the propulsion pipe 4 in the ground by the propulsion method outlined above, the propulsion pipe 4 enters the ground by the pressing force by the jack 3 from the starting stand 1 shown in FIG. Before making the drug injection hole 41 of the propulsion tube 4 into the drug injection hole 41 from the outside of the propulsion tube 4 by connecting the screw cap 6 to the female screw part 41a and the male screw part 61a as shown in FIG. 41 and the end plate portion 62 of the screw lid 6 is positioned at the opening end of the drug injection hole 41 on the outer peripheral side of the propelling tube 4. Further, as shown in FIG. 7, a check valve V is attached to the medicine injection hole 41 from the inside of the propelling pipe 4 and one end of the medicine feeding pipe 8 is connected to the medicine injection hole 41.

しかして、その推進管４を地中に進入させた後、薬剤給送管８を通じて地上から薬剤注入孔４１内に所定の薬剤を供給する。すると、薬剤の圧力により逆止弁Ｖの弁体Ｖ１が図７の一点鎖線で示されるようＶ字状に開かれ、これによりネジ蓋６の内部に薬剤が流入する。更に、ネジ蓋６内に流入した薬剤は、吐出口６１ｂを通じて掘削抗Ｔの内周と推進管４の外周との間の空隙Ｇに流出することとなる。   Thus, after the propelling tube 4 has entered the ground, a predetermined medicine is supplied from the ground into the medicine injection hole 41 through the medicine feeding pipe 8. Then, the valve body V1 of the check valve V is opened in a V shape as indicated by a one-dot chain line in FIG. 7 due to the pressure of the medicine, and thereby the medicine flows into the screw lid 6. Furthermore, the medicine that has flowed into the screw cap 6 flows out into the gap G between the inner periphery of the excavation anti-T and the outer periphery of the propelling tube 4 through the discharge port 61b.

尚、推進管４が掘削抗Ｔ内を進行する段階では、上記空隙Ｇに薬剤として潤滑剤が供給されることにより、推進管４の推進抵抗が軽減される。このため、推進管４は掘削抗Ｔ内を低負荷の下で円滑に進行することができる。しかも、本発明によれば、推進管４の外周側で薬剤注入孔４１にネジ蓋６が装着されることにより、掘削抗Ｔ内の石が薬剤注入孔４１の開口縁に食い込んで推進管４の進行を妨げたり、薬剤注入孔４１の周辺が石の激突によって破壊されたりすることが防止される。このため、推進管４を埋設直後に補修する必要がなくなり、推進管４の耐圧性、水密性を所期状態に保つことが可能となる。   Incidentally, when the propulsion pipe 4 advances in the excavation anti-T, the propulsion resistance of the propulsion pipe 4 is reduced by supplying a lubricant as a chemical to the gap G. For this reason, the propulsion pipe 4 can smoothly travel in the excavation anti-T under a low load. In addition, according to the present invention, the screw lid 6 is attached to the drug injection hole 41 on the outer peripheral side of the propulsion tube 4, so that the stone in the excavation anti-T bites into the opening edge of the drug injection hole 41. It is possible to prevent the progress of the above-described process or the surroundings of the drug injection hole 41 from being destroyed by a stone crash. For this reason, it becomes unnecessary to repair the propulsion pipe 4 immediately after embedding, and the pressure resistance and water tightness of the propulsion pipe 4 can be maintained in an expected state.

一方、図１に示す掘進機Ｍが到達立抗２に達した段階では、図８のように、上記空隙Ｇに薬剤として硬化性の樹脂、セメントペースト、又はセメントモルタルといったグラウト剤Ｕが供給され、これにより空隙Ｇが完全に埋められるほか、推進管４の内周側においても薬剤注入孔４１がモルタル等の充填剤ｆにより完全に塞がれ、これにより推進管４の安定性や止水性能が確保されることとなる。   On the other hand, when the excavator M shown in FIG. 1 reaches the ultimate resistance 2, a grouting agent U such as a curable resin, cement paste, or cement mortar is supplied to the gap G as a medicine as shown in FIG. As a result, the gap G is completely filled, and the drug injection hole 41 is also completely closed by the filler f such as mortar on the inner peripheral side of the propulsion tube 4, whereby the stability of the propulsion tube 4 and the water stoppage are improved. Performance will be ensured.

因みに、図７は推進管４の軸線に沿う薬剤注入孔４１の周辺における縦断面を示し、図８は推進管４の軸線に直角な薬剤注入孔４１の周辺における横断面を示している。   7 shows a vertical cross section around the drug injection hole 41 along the axis of the propulsion tube 4, and FIG. 8 shows a cross section around the drug injection hole 41 perpendicular to the axis of the propulsion pipe 4.

以上、本発明の好適な実施形態について説明したが、推進管４はヒューム管（標準品として長さ２４３０ｍｍのほか、１２００ｍｍ、８００ｍｍのものがある）に限らず、鋼管、ダクタイル管、二重構造鋼管などでもよく、その形態も円筒形に限らずボックスカルバートなどの矩形管が用いられる場合もある。尚、既製の推進管として、上記のような薬剤注入孔４１が設けられるものは、口径が８００ｍｍ以上のヒューム管に限られているので、本発明で用いる推進管としても口径８００ｍｍ以上のヒューム管が好適である。 Although the preferred embodiment of the present invention has been described above, the propulsion pipe 4 is not limited to the fume pipe (the standard product includes those of 1200 mm and 800 mm in addition to the length of 2430 mm), but also a steel pipe, a ductile pipe, and a double structure. A steel pipe or the like may be used, and the form is not limited to a cylindrical shape, and a rectangular pipe such as a box culvert may be used. In addition, since the thing provided with the above chemical | medical agent injection holes 41 as an existing propulsion pipe is limited to a fume pipe | tube with a diameter of 800 mm or more, a fume pipe | tube with a diameter of 800 mm or more is also used as a propulsion pipe used by this invention. it is preferred.

Ｍ 掘進機
Ｔ 掘削抗
Ｇ 空隙
３ ジャッキ
４ 推進管
４１ 薬剤注入孔
４１ａ 雌ネジ部
６ ネジ蓋
６１ 胴部
６１ａ 雄ネジ部
６１ｂ 吐出口
６２ 端板部
６２ａ 切欠部
７ 工具
７２ａ 爪
M Excavator T Drilling Anti-G Gap 3 Jack 4 Propulsion Pipe 41 Drug Injection Hole 41a Female Screw 6 Screw Cover 61 Body 61a Male Screw 61b Discharge Port 62 End Plate 62a Notch 7 Tool 72a Claw

Claims (1)

管壁に雌ネジ部を有する薬剤注入孔が開口された推進管を掘進機の後部に連結し、前記掘進機とその後続に順次継ぎ足される推進管とをジャッキで押圧して地中に進入させることにより、前記推進管による管路を地中に構築する推進工法において、
所定の開口面積を有する吐出口と、前記薬剤注入孔の雌ネジ部に対応する雄ネジ部とが形成された円筒状の胴部の一端に、端板部を備えた断面凹字形のネジ蓋を用い、
前記推進管を地中に進入させる前に、前記ネジ蓋を前記雌ネジ部と前記雄ネジ部との結合により前記推進管の外側から前記薬剤注入孔に装着し、前記端板部を前記推進管の外周側で前記薬剤注入孔の開口端に位置付け、
前記推進管を地中に進入させた後、当該推進管の内側から前記薬剤注入孔と前記ネジ蓋の吐出口とを通じて、前記掘進機により掘り進まれた掘削抗の内周と前記推進管の外周との間の空隙に薬剤を供給することを特徴とする推進工法。 A propelling pipe having a female injection hole in the pipe wall and having a drug injection hole opened is connected to the rear part of the excavator, and the excavator and the propelling pipe sequentially added thereafter are pressed with a jack to enter the ground. In the propulsion method of building the pipeline by the propulsion pipe in the ground,
A screw cap having a concave cross section provided with an end plate at one end of a cylindrical body portion in which a discharge port having a predetermined opening area and a male screw portion corresponding to the female screw portion of the drug injection hole are formed. Use
Before the propulsion tube enters the ground, the screw lid is attached to the drug injection hole from the outside of the propulsion tube by coupling the female screw portion and the male screw portion, and the end plate portion is propelled. Positioned at the open end of the drug injection hole on the outer periphery side of the tube,
After allowing the propulsion pipe to enter the ground, the inner circumference of the excavation resistor digged by the excavator through the drug injection hole and the discharge port of the screw lid from the inside of the propulsion pipe and the propulsion pipe A propulsion method characterized by supplying a medicine into a gap between the outer periphery.
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