JP2006336436A - Reaming tool and non-cutting pipe burying method using it - Google Patents

Reaming tool and non-cutting pipe burying method using it Download PDF

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JP2006336436A
JP2006336436A JP2005166286A JP2005166286A JP2006336436A JP 2006336436 A JP2006336436 A JP 2006336436A JP 2005166286 A JP2005166286 A JP 2005166286A JP 2005166286 A JP2005166286 A JP 2005166286A JP 2006336436 A JP2006336436 A JP 2006336436A
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relay rod
rod
diameter expansion
expansion jig
jig
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JP4256861B2 (en
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Shinpei Kukida
真平 久木田
Sunao Terunuma
直 照沼
Masao Kawanabe
正男 川鍋
Kazufumi Yamaguchi
一史 山口
Satoshi Obara
智 小原
Shinichi Ebine
進一 海老根
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Fuji Industrial Co Ltd
Fuji Kogyo KK
Keiyo Gas Co Ltd
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Fuji Industrial Co Ltd
Fuji Kogyo KK
Keiyo Gas Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a reaming tool and a non-cutting pipe burying method using the tool to facilitate laying work of a pipe, following pre-reaming work before laying the pipe by using the reaming tool while retracting a propulsion rod excavating a drift in a non-cutting manner. <P>SOLUTION: The reaming tool is detachably fixed to a relay rod connected to the propulsion rod in a manner of being externally fitted to the relay rod. The reaming tool having a through hole part which is externally fitted to the relay rod is divided into a plurality of parts in a connectable manner. A binding means is provided at a connection part between the relay rod and the reaming tool for binding the reaming tool not to slide along the relay rod. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、非開削で坑道を掘削する推進ロッドを引き戻しながら、配管引き込み前に拡径冶具で事前拡径作業を行い、次の工程の配管の引き込みを容易にするための拡径冶具およびこれを用いた非開削管埋設工法に関するものである。   The present invention relates to a diameter expanding jig for facilitating the pulling of a pipe in the next process by performing a pre-expanding operation with a diameter expanding jig before pulling in a pipe while pulling back a propelling rod excavating a tunnel without opening. It relates to the non-cut-off pipe burying method using

従来の非開削の推進工法では、第１工程として、掘削用のヘッドが先端に装着された管状の推進ロッドを、推進機で掘削開始地点となる地上もしくは発進立坑から地中に押し込み、推進ロッドを推進させて地中を掘進し、掘進方向に離間した到達立坑に前記ヘッドを到達させるパイロット削孔を行う。
次いで、第２工程として、この形成された削孔軌道を拡大するために、前記ヘッドを外した推進側のロッドＲ１’に、図８に示すように拡径リーマ４０をネジで接続し、該拡径リーマ４０の後方には接続具４１を介して中継ロッドＲ２’を順次に連結して前記削孔内に引き込み、拡径リーマ４０を通して坑道を広げる事前拡径作業を行う。
この際に前記中継ロッドを到達坑内で順次に繋げて接続しておく。
次に、第３工程として、前記中継ロッドの後端は到達坑内にあるので、該到達坑内で、埋設する管外径に適合したバックリーマを中継ロッドの先端に取付け、バックリーマを拡径された削孔内に引き込み、ＰＥ管などの埋設用の管材を引き込み、埋設を行っている。 In a conventional non-open-cut propulsion method, as a first step, a tubular propulsion rod with a head for excavation attached to the tip is pushed into the ground from the ground or starting shaft where the excavator starts excavation, and the propulsion rod And drilling in the ground, and pilot drilling is performed to reach the head to a reaching shaft separated in the direction of excavation.
Next, as a second step, in order to enlarge the formed drilling track, the enlarged diameter reamer 40 is connected with a screw as shown in FIG. 8 to the propelling side rod R1 ′ from which the head has been removed. A relay rod R2 ′ is sequentially connected to the rear side of the enlarged diameter reamer 40 via a connecting tool 41 and drawn into the drilling hole, and a preliminary diameter expansion operation for expanding the tunnel through the enlarged diameter reamer 40 is performed.
At this time, the relay rods are sequentially connected and connected in the arrival shaft.
Next, as the third step, since the rear end of the relay rod is in the reaching shaft, a back reamer suitable for the outer diameter of the pipe to be embedded is attached to the tip of the relay rod in the reaching shaft, and the diameter of the back reamer is expanded. It is drawn into the drilled hole, and buried pipe material such as PE pipe is buried.

ここで第２工程の拡孔作業では、図示例の場合、拡径リーマ４０は、第３工程で使用するバックリーマと同一構造でやや小さい外径からなっており、先端には推進側のロッドＲ１’と連結するためのネジ孔を有しており、後部には連結用の孔を有する突片４０ａが形成されている。
そして、拡径リーマ４０の突片４０ａと中継ロッドＲ２’との間には、一方側に前記拡径リーマ４０の前記孔に通す連結ピン４２を着脱可能に有する連結ブラケットを有し、他端側に中継ロッドＲ２’の先端に形成されたネジ孔に螺合するネジ部４３を突設した接続具４１を介設して、前記推進側のロッドＲ１’と中継ロッドＲ２’とを拡径リーマ４０および接続具４１とを介して一連に接続している。
そのため第３工程に移行する際に、発進立坑まで牽引された拡径リーマ４０を推進側のロッドＲ１’から外し、同様に接続具４１を中継ロッドＲ２’から外すと、拡径リーマ４０と接続具４１の長さ分だけ推進側のロッドＲ１’と中継ロッドＲ２’との間が離れてしまい、両ロッドＲ１’とＲ２７を相互にネジ止めするには、推進器自体を発進立坑内で移動する必要があり、手間のかかる煩雑な作業となっている。
特開２００１−１１５７７６号 図２参照 特開２００３−２１４０８８号 図１参照 Here, in the hole expansion work in the second step, in the case of the illustrated example, the diameter reamer 40 has the same structure as the back reamer used in the third step and has a slightly smaller outer diameter. A screw hole for connecting to R1 ′ is provided, and a projecting piece 40a having a connecting hole is formed at the rear part.
Between the protruding piece 40a of the enlarged diameter reamer 40 and the relay rod R2 ′, there is a connecting bracket having a connecting pin 42 that can be attached to and detached from the hole of the enlarged diameter reamer 40 on one side. The propulsion side rod R1 ′ and the relay rod R2 ′ are expanded in diameter by a connecting tool 41 having a screw portion 43 projecting into a screw hole formed at the tip of the relay rod R2 ′ on the side. The reamer 40 and the connection tool 41 are connected in series.
Therefore, when moving to the third step, if the diameter-reamed reamer 40 pulled to the start shaft is removed from the propelling rod R1 ′, and similarly the connector 41 is removed from the relay rod R2 ′, the diameter-reamed reamer 40 is connected. The propulsion rod R1 ′ and the relay rod R2 ′ are separated by the length of the tool 41 and the rods R1 ′ and R27 are screwed together to move the propeller itself within the starting shaft. This is a laborious and cumbersome task.
Japanese Patent Laid-Open No. 2001-115777 Refer to FIG. Japanese Patent Laid-Open No. 2003-214088 See FIG.

この発明が解決しようとする課題は、非開削工法における事前の拡孔作業（プレリーミング）において、拡径冶具を外した際に、推進側のロッドと中継ロッドとの連結作業を不要とした拡径冶具を提供することにある。   The problem to be solved by the present invention is that, in the prior hole expansion work (pre-reaming) in the non-opening method, when the diameter expansion jig is removed, the connection work between the propulsion side rod and the relay rod becomes unnecessary. It is to provide a radial jig.

この発明は、上記課題を解決するために、請求項１の拡径冶具の発明では、
推進ロッドに連結される中継ロッドに、該中継ロッドに外嵌して着脱可能に固定される拡径冶具を設け、
拡径冶具が、前記中継ロッドを外嵌する貫通孔部を有して連結可能に複数に分割されており、
前記中継ロッドと拡径冶具との連結個所に、拡径冶具が前記中継ロッドに沿って摺動しないように拘束する拘束手段を設けてなることを特徴とする。
また請求項２の発明では、
前記拘束手段が、中継ロッドの外周壁面に、中継ロッドの軸方向に延びる凹凸係合の一方の構成部、または中継ロッドの軸心を中心とした外周方向に延びる凹凸係合の一方の構成部と、
拡径冶具の貫通孔の内周壁面に、前記一方の構成部に対応する位置で、該一方の構成部と嵌合する他方の構成部とからなることを特徴とする。
更に、請求項３の発明では、
前記中継ロッドの外周面に水などの液体を噴射させる第１噴射孔を設けると共に、
拡径冶具の貫通孔部の内壁面で前記第１噴射孔と整合する位置に該内壁面から拡径冶具の外表面に貫通する第２噴射孔を設けてなることを特徴とする。 In order to solve the above-mentioned problem, the present invention provides a diameter expanding jig according to claim 1,
A relay rod connected to the propulsion rod is provided with a diameter expansion jig that is externally fitted to the relay rod and fixed detachably,
The diameter expansion jig has a through-hole part that externally fits the relay rod, and is divided into a plurality of pieces that can be connected,
The connecting portion between the relay rod and the diameter expansion jig is provided with a restraining means for restraining the diameter expansion jig from sliding along the relay rod.
In the invention of claim 2,
One of the constituent parts of the concave-convex engagement extending in the axial direction of the relay rod on the outer peripheral wall surface of the relay rod, or one constituent part of the concave-convex engagement extending in the outer peripheral direction around the axis of the relay rod. When,
The inner peripheral wall surface of the through-hole of the diameter expanding jig is composed of the other constituent part fitted to the one constituent part at a position corresponding to the one constituent part.
Furthermore, in the invention of claim 3,
While providing a first injection hole for injecting a liquid such as water on the outer peripheral surface of the relay rod,
A second injection hole penetrating from the inner wall surface to the outer surface of the diameter expanding jig is provided at a position aligned with the first injection hole on the inner wall surface of the through hole portion of the diameter expanding jig.

請求項４に記載の非開削管埋設工法の発明では、
推進機から推進ロッドを到達立坑まで推進してパイロット削孔を形成する第１工程と、
到達立坑内で前記推進ロッドに中継ロッドを接続し、該中継ロッドに着脱可能な拡径冶具を固定して前記推進機でパイロット削孔内を引き戻して拡径冶具で前記パイロット削孔を事前拡径すると共に、前記引き込まれる中継ロッドに順次中継ロッドを継ぎ足していく第２工程と、
前記拡径冶具が発進立坑まで引き戻されると拡径冶具を中継ロッドから外し、
中継ロッドに継ぎ足されて到達立坑にある最後尾の中継ロッドの後方にバックリーマを接続し、該バックリーマの後方に埋設管の先端を接続し、推進機により前記事前拡径された坑道内に埋設管を引き込んで埋設する第３工程とからなり、
第２工程で使用する拡径冶具が、前記中継ロッドを外嵌する貫通孔部を有して連結可能に複数に分割されており、
前記中継ロッドと拡径冶具との連結個所に、拡径冶具が前記中継ロッドに沿って摺動しないように拘束する拘束手段を設けてなることを特徴とする。 In the invention of the non-cutting pipe embedding method according to claim 4,
A first step of propelling a propulsion rod from a propulsion device to a shaft and forming a pilot hole;
A relay rod is connected to the propulsion rod in the reach shaft, a diameter expansion jig that can be attached to and detached from the relay rod is fixed, the pilot drill hole is pulled back by the propulsion unit, and the pilot hole is expanded beforehand by the diameter expansion jig. And a second step of sequentially adding a relay rod to the relay rod to be drawn,
When the diameter expansion jig is pulled back to the start shaft, the diameter expansion jig is removed from the relay rod,
A back reamer is connected to the rear of the last relay rod in the reach shaft that is added to the relay rod, and the tip of the buried pipe is connected to the back of the back reamer. And the third step of burying by burying the buried pipe,
The diameter expansion jig used in the second step has a through hole portion that externally fits the relay rod, and is divided into a plurality of pieces that can be connected,
The connecting portion between the relay rod and the diameter expansion jig is provided with a restraining means for restraining the diameter expansion jig from sliding along the relay rod.

この発明の拡径冶具は、中継ロッドに着脱可能に固定することができるので、事前拡径作業においては、推進側のロッドと中継ロッドとを直接に接続し、この接続された中継ロッドに拡径冶具を固定することで、発進立坑まで牽引された拡径冶具を中継ロッドから外すだけで、推進側のロッドと中継ロッドの着脱を再度行うことがなく、次のバックリーマを用いた埋設管引込み作業を容易に行うことができる。
特に、発進立坑内に推進機を設置した場合には、推進機を移動する必要が無く利便性が高い。
また、拡径冶具に、中継ロッドの第１噴射孔と整合する第２噴射孔を設けることで、水などの液体をロッドから拡径冶具を介して地中に噴射することができる。 Since the diameter expansion jig of the present invention can be detachably fixed to the relay rod, in advance diameter expansion work, the propulsion-side rod and the relay rod are directly connected and expanded to the connected relay rod. By fixing the diameter jig, simply removing the diameter expansion jig pulled up to the starting shaft from the relay rod, it is not necessary to reattach and remove the rod and relay rod on the propulsion side, and the buried pipe using the next back reamer The pull-in operation can be easily performed.
In particular, when a propulsion device is installed in the start shaft, there is no need to move the propulsion device, which is highly convenient.
Moreover, by providing the second expansion hole aligned with the first injection hole of the relay rod in the diameter expansion jig, a liquid such as water can be injected from the rod into the ground via the diameter expansion jig.

以下にこの発明の拡径冶具およびこれを用いた非開削管埋設工法の好適実施例について図面を参照しながら説明する。   A preferred embodiment of a diameter expansion jig according to the present invention and a non-open-cut pipe embedding method using the same will be described below with reference to the drawings.

この拡径冶具１は、非開削工法で事前の拡孔作業（プレリーミング）において使用するものである。
本実施例では、推進機３０から地中を推進して到達孔に到達した推進ロッドＲ１の先端のヘッド（図示省略）を外し、先端となる推進側のロッドＲ１に第１段目の中継ロッドＲ２を接続する（図示せず）。 This diameter expansion jig 1 is used in a prior hole expansion operation (pre-reaming) by a non-open cutting method.
In this embodiment, the head (not shown) at the tip of the propulsion rod R1 propelled underground from the propulsion device 30 and reaching the arrival hole is removed, and the first-stage relay rod is connected to the rod R1 on the propulsion side serving as the tip. R2 is connected (not shown).

ここで推進側のロッドＲ１と中継ロッドＲ２とは、図１に示すように同一の接続構造が形成されており、本実施例では一端側の内周面にはネジ孔Ｓ１が形成され、他端側には前記ネジ孔Ｓ１と整合するネジが刻設されたネジ棒部Ｓ２が形成されている。
従って、推進側のロッドＲ１の先端のネジ棒Ｓ２に、前記中継ロッドＲ２のネジ孔Ｓ１を挿入し、ネジ止めして両ロッドＲ１、Ｒ２を接続している。 Here, the rod R1 on the propulsion side and the relay rod R2 have the same connection structure as shown in FIG. 1, and in this embodiment, a screw hole S1 is formed on the inner peripheral surface on one end side. On the end side, a screw rod portion S2 is formed in which a screw aligned with the screw hole S1 is formed.
Therefore, the screw hole S1 of the relay rod R2 is inserted into the screw rod S2 at the tip of the propelling rod R1, and the rods R1, R2 are connected by screwing.

前記第１段目の中継ロッドＲ２には、一方の拘束手段として、その外周壁面に、中継ロッドＲ２の軸方向に延びる第１突部２１と、中継ロッドＲ２の軸心を中心とした外周方向に延びる第２突部２２とが形成されている。
図示例では第１突部２１は、軸心を中心として外周方向に等間隔に２つ形成されているが、１つであっても、３つ以上であってもよい。 The first-stage relay rod R2 has, as one restraining means, a first protrusion 21 extending in the axial direction of the relay rod R2 on the outer peripheral wall surface, and an outer peripheral direction centered on the axis of the relay rod R2. The 2nd protrusion part 22 extended in this is formed.
In the illustrated example, two first protrusions 21 are formed at equal intervals in the outer circumferential direction with the axis as the center, but may be one or three or more.

同様に第２突部２２も１または複数であってもよい。
更に、前記中継ロッドＲ２は第１突部２１、第２突部２２のいずれか一方を設ける構造であってもよいし、突部の形状としては両者を組み合わせた形状などでもよい。
また、この実施例では中継ロッドＲ２側を突部としたが、孔であってよく、あるいは突部と孔とをそれぞれ設けた構成であってもよい。 Similarly, the number of the second protrusions 22 may be one or more.
Further, the relay rod R2 may have a structure in which one of the first protrusion 21 and the second protrusion 22 is provided, and the shape of the protrusion may be a combination of both.
Further, in this embodiment, the relay rod R2 side is a protrusion, but it may be a hole, or a structure provided with a protrusion and a hole, respectively.

次に、拡径冶具１は、図示例の場合、中央が最も大径で両端に向かって徐々に縮径するラグビーボール形状からなっており、中央には前記中継ロッドＲ２に外嵌するための貫通孔５が形成されている。
この形状は、円錐形や角錐形、あるいはこれに準じた形状など、要するに一方向に拡径可能な形状であればよく、図示例に限定されるものではない。 Next, in the case of the illustrated example, the diameter expansion jig 1 has a rugby ball shape having the largest diameter at the center and gradually reducing the diameter toward both ends, and for fitting the relay rod R2 to the center at the center. A through hole 5 is formed.
The shape is not limited to the illustrated example as long as the shape can be expanded in one direction, such as a cone shape, a pyramid shape, or a shape conforming thereto.

そして、この拡径冶具１は、図２に明瞭なように、長手方向に沿って中央で２分割される一対の分割構造体２Ａからなっている。
図示例の場合、この分割構造体２Ａは、一端側でヒンジ部３を介して連結されており、他端側に相互に重なり合う連結片２ａを設け、一対の分割構造体２Ａを固定するための係止構造またはネジ止めなどの固定構造４が設けられ着脱可能に固定されている。 And this diameter-expansion jig | tool 1 consists of a pair of division | segmentation structure 2A divided | segmented into 2 at the center along a longitudinal direction so that it may be clear in FIG.
In the case of the illustrated example, this divided structure 2A is connected to one end side via a hinge portion 3, and is provided with a connecting piece 2a that overlaps the other end side to fix the pair of divided structures 2A. A fixing structure 4 such as a locking structure or screwing is provided and fixed detachably.

また、分割構造体２Ａで２分割された貫通孔５の内周壁面５Ａには、前記中継ロッドＲ２の第１突部２１および第２突部２２に対応した凹部からなる第１凹部１１と第２凹部１２が形成されている。
即ち、第１凹部１１は分割構造体２Ａの長手方向に伸びる溝状の凹部からなっており、第２凹部１２は貫通孔５の軸線を中心にして内周壁面５Ａに沿って半円形に延びる溝状の凹部からなっている。 Further, on the inner peripheral wall surface 5A of the through hole 5 divided into two by the divided structure 2A, the first concave portion 11 and the second concave portion corresponding to the first protruding portion 21 and the second protruding portion 22 of the relay rod R2 are provided. Two recesses 12 are formed.
That is, the first recess 11 is a groove-like recess extending in the longitudinal direction of the divided structure 2A, and the second recess 12 extends in a semicircular shape along the inner peripheral wall surface 5A around the axis of the through hole 5. It consists of a groove-shaped recess.

そして、前記第１突部２１に第１凹部１１を嵌合し、第２突部２２に第２凹部１１を嵌合することで、拡径冶具１が中継ロッドＲ２の軸方向および軸線を中心とした外周方向にずれるのを防止している。
また、拡径冶具１側の受部構造は、前記中継ロッドＲ２に形成された突部に対応するものであるから、中継ロッドＲ２側を受部とした場合にはこれに対応する突部が形成される。 Then, by fitting the first recess 11 to the first protrusion 21 and the second recess 11 to the second protrusion 22, the diameter expanding jig 1 is centered on the axial direction and the axis of the relay rod R2. It is prevented from shifting in the outer peripheral direction.
Moreover, since the receiving part structure by the side of the diameter expansion jig 1 respond | corresponds to the protrusion formed in the said relay rod R2, when the relay rod R2 side is made into a receiving part, the protrusion corresponding to this has a protrusion. It is formed.

本実施例では、前記中継ロッドＲ２に、拡径冶具１の取付個所から離間した位置に水などを噴射させる噴射孔２３が穿設されているので、拡径冶具１から離間した位置で水などを噴射させることができる。
図３には、拡径冶具１を２分割に分離した分割構造体２Ａを示す。
この分割構造体２Ａは、ヒンジ部を設けず、各分割構造体２Ａに相互に重なり合う連結片２ａを設け、ネジ止めなどの固定構造４を用いて着脱可能に固定することができるようになっている。その他の構成は前記実施例と同様である。 In the present embodiment, the relay rod R2 is provided with the injection hole 23 for injecting water or the like at a position separated from the attachment location of the diameter expansion jig 1, so that water or the like is disposed at a position away from the diameter expansion jig 1. Can be injected.
FIG. 3 shows a divided structure 2A in which the diameter expansion jig 1 is divided into two parts.
This divided structure 2A is provided with a connecting portion 2a that overlaps each divided structure 2A without providing a hinge portion, and can be detachably fixed using a fixing structure 4 such as a screw. Yes. Other configurations are the same as those in the above embodiment.

図４に示す拡径冶具１では、中継ロッドＲ２の拡径冶具１を連結する個所に前記噴射孔と同様の第１噴射孔２３が形成されている。
一方、拡径冶具１には、その分割構造体２Ａの貫通孔の内周壁面５Ａで、前記中継ロッドＲ２に固着した際に中継ロッドＲ２の第１噴射孔２３と整合する位置に、前記内周壁面５Ａから拡径冶具１の外表面に貫通する第２噴射孔１３を設けている。
これにより、推進側のロッド内から導入された水などの液体を前記第１噴射孔２３から第２噴射孔１３へ連通させて外部に噴射させることができる。 In the diameter expansion jig 1 shown in FIG. 4, a first injection hole 23 similar to the injection hole is formed at a location where the diameter expansion jig 1 of the relay rod R2 is connected.
On the other hand, in the diameter expansion jig 1, the inner peripheral wall surface 5A of the through hole of the divided structure 2A is positioned at a position aligned with the first injection hole 23 of the relay rod R2 when fixed to the relay rod R2. A second injection hole 13 penetrating from the peripheral wall surface 5A to the outer surface of the diameter expanding jig 1 is provided.
As a result, a liquid such as water introduced from the inside of the rod on the propulsion side can be communicated from the first injection hole 23 to the second injection hole 13 and injected outside.

次に、この拡径冶具を用いた非開削管埋設工法について説明する。
まず第１工程として、図５に示すように、発進立坑３１内に推進機３０をセットし、該推進機３０から掘削用のヘッドが先端に装着された推進ロッドＲ１を地中に押し込み、パイロット削孔Ｈ１を行いながら到達立坑３５へ到達させる。 Next, the non-cutting pipe burying method using this diameter expansion jig will be described.
First, as shown in FIG. 5, as shown in FIG. 5, a propulsion device 30 is set in the start shaft 31, and a propulsion rod R1 having a head for excavation is pushed into the ground from the propulsion device 30 to be piloted. The drill reaches the reaching shaft 35 while performing the drilling H1.

次ぎに、第２工程として、前記ヘッドを外した推進側のロッドＲ１に前記第１段目の中継ロッドＲ２を接続する。
そして、図６（ａ）に示すように、この中継ロッドＲ２に、前記拡径冶具１を固定した状態で、推進機３０で前記パイロット削孔Ｈ１内を引き戻す。
この際に拡径冶具１はパイロット削孔Ｈ１より大径であるので、該孔をやや大きく広げることができる。 Next, as a second step, the first-stage relay rod R2 is connected to the propulsion side rod R1 from which the head has been removed.
Then, as shown in FIG. 6A, the inside of the pilot hole H <b> 1 is pulled back by the propulsion device 30 with the diameter expansion jig 1 fixed to the relay rod R <b> 2.
At this time, since the diameter expansion jig 1 has a larger diameter than the pilot hole H1, the hole can be expanded slightly larger.

また、パイロット削孔Ｈ１内に引き込まれる第１段目の中継ロッドＲ２には、順次、第２段目以降の中継ロッドＲ２ａを同様にネジで接続していく。
このようにして拡径冶具１が発進立坑３１内まで引き戻されると、事前拡径された坑道Ｈ２が形成され作業が終了する（図６（ｂ）参照）。
そこで、この拡径冶具１を中継ロッドＲ２から外す。 Further, the relay rod R2a at the second and subsequent stages is sequentially connected to the first-stage relay rod R2 drawn into the pilot hole H1 by screws in the same manner.
When the diameter expansion jig 1 is pulled back into the start shaft 31 in this way, a diameter H2 having a diameter expanded in advance is formed and the operation is completed (see FIG. 6B).
Therefore, the diameter expansion jig 1 is removed from the relay rod R2.

ここで拡径冶具１が外されても、推進側のロッドＲ１と前記中継ロッドＲ２とはネジ止めされたままの状態であり、且つ到達立坑３５には直前に接続した終端の中継ロッドＲ２ｂの端部が現れているので、該終端の中継ロッドＲ２ｂの端部に拡径冶具１よりやや大径な拡径冶具としてのバックリーマ１０を接続し、該バックリーマ１０には連結具１１を介するなどしてバックリーマ１０とほぼ同径のＰＥ管などの埋設管Ｒ３を接続する（図７（ａ）参照）。   Here, even if the diameter expansion jig 1 is removed, the propulsion-side rod R1 and the relay rod R2 remain screwed, and the terminal shaft 35 has a terminal relay rod R2b connected immediately before it. Since the end portion appears, a back reamer 10 as a diameter expansion jig having a diameter slightly larger than that of the diameter expansion jig 1 is connected to the end portion of the terminal relay rod R2b. Thus, the buried pipe R3 such as a PE pipe having substantially the same diameter as the back reamer 10 is connected (see FIG. 7A).

そして、推進機３０で前記中継ロッドＲ２ｂを介してバックリーマ１０を前記事前拡径された坑道Ｈ２内に引き込み、同様に前記埋設管Ｒ３も引き込んで、バックリーマ１０による拡径を行いながら発進立坑３１内まで坑道Ｈ３を広げながら牽引して埋設管Ｐ３を埋設することができる（図７（ｂ）参照）。
このように、第２工程では、バックリーマのように拡径冶具を推進側のロッドと中継ロッドとの間に介設するのではなく、中継ロッドに着脱可能に固定するだけであるので、簡単に事前拡径作業を行うことができる。
なお、この発明では前述のように拡径冶具の形状や、分割構造体の連結構造等は公知の構造に置き換えることができ、その他、要するにこの発明の要旨を変更しない範囲で種々設計変更しうること勿論である。 The propulsion device 30 pulls the back reamer 10 through the relay rod R2b into the pre-expanded mine shaft H2, similarly pulls the buried pipe R3, and starts up while expanding the diameter by the back reamer 10. The buried pipe P3 can be buried by being pulled while expanding the tunnel H3 into the vertical shaft 31 (see FIG. 7B).
In this way, in the second step, the diameter expansion jig is not interposed between the propulsion side rod and the relay rod as in the case of the back reamer, but is simply detachably fixed to the relay rod. In advance, the diameter can be increased in advance.
In the present invention, as described above, the shape of the diameter expansion jig, the connection structure of the divided structures, and the like can be replaced with known structures, and various other design changes can be made without departing from the scope of the present invention. Of course.

上記実施例では、埋設管を引き込む非削孔工法に用いる場合を例示したが、この発明は、上記用途に限定されず、その他の非削孔工法で坑道を拡径する場合ににも適用できる。   In the above embodiment, the case of using the non-drilling method for pulling in the buried pipe is illustrated, but the present invention is not limited to the above-mentioned use, and can be applied to the case where the diameter of the tunnel is expanded by other non-drilling methods. .

拡径冶具を取り付ける中継ロッドを示す側面図である。It is a side view which shows the relay rod which attaches a diameter expansion jig. （ａ）は図１に用いる拡径冶具の側面から見た断面図、（ｂ）同正面図から見た断面図、（ｃ）は中継ロッドから拡径冶具を外した状態の断面図である。(A) is sectional drawing seen from the side of the diameter expansion jig used for FIG. 1, (b) Sectional drawing seen from the front view, (c) is sectional drawing of the state which removed the diameter expansion jig from the relay rod. . ヒンジ部を設けず２分割された分割構造体からなる拡径冶具の断面図である。It is sectional drawing of the diameter-expansion jig which consists of a division structure divided into 2 without providing a hinge part. （ａ）は第１噴射孔を備えた中継ロッドを示す側面図、（ｂ）は第２噴射口を有する拡径冶具を中継ロッドに取り付けた状態の側面図、（ｃ）は中央縦断面図である。(A) is a side view showing a relay rod provided with a first injection hole, (b) is a side view of a state in which a diameter expansion jig having a second injection port is attached to the relay rod, and (c) is a central longitudinal sectional view. It is. 非開削管埋設工法の第１工程を示す説明図である。It is explanatory drawing which shows the 1st process of a non-cut-off pipe embedding construction method. （ａ）は第２工程の途中を示す説明図、（ｂ）は第２工程が完了し、拡径冶具を取り外す直前の説明図である。(A) is explanatory drawing which shows the middle of a 2nd process, (b) is explanatory drawing just before a 2nd process is completed and removing a diameter expansion jig. （ａ）は第３工程のはじめを示す説明図、（ｂ）は第３工程の途中を示す説明図である。(A) is explanatory drawing which shows the beginning of a 3rd process, (b) is explanatory drawing which shows the middle of a 3rd process. 従来構造の取付状態を説明する分解図である。It is an exploded view explaining the attachment state of the conventional structure.

符号の説明Explanation of symbols

１ 拡径冶具
２Ａ 分割構造体
３ ヒンジ部
４ 固定構造
５ 貫通孔
５Ａ 内周壁面
１１ 第１凹部
１２ 第２凹部
１３ 第２噴射孔
２１ 第１突部
２２ 第２突部
２３ 噴射孔
３１ 発進立坑
３０ 推進機
３５ 到達立坑
Ｈ１ パイロット削孔
Ｈ２ 事前拡径された坑道
Ｈ３ 最終拡径された坑道
Ｒ１ 推進側のロッド
Ｒ２ 第１段の中継ロッド
Ｒ２ａ 第２段目以降の中継ロッド
Ｒ２ｂ 最終段の中継ロッド
Ｒ３ 埋設管 DESCRIPTION OF SYMBOLS 1 Expanding jig 2A Split structure 3 Hinge part 4 Fixing structure 5 Through-hole 5A Inner peripheral wall surface 11 1st recessed part 12 2nd recessed part 13 2nd injection hole 21 1st protrusion 22 2nd protrusion 23 Injection hole 31 Starting shaft 30 Propeller 35 Reaching shaft H1 Pilot drilling hole H2 Pre-expanded tunnel H3 Final expanded tunnel R1 Propulsion side rod R2 First stage relay rod R2a Second stage relay rod R2b Final stage relay Rod R3 buried pipe

Claims (4)

推進ロッドに連結される中継ロッドに、該中継ロッドに外嵌して着脱可能に固定される拡径冶具を設け、
拡径冶具が、前記中継ロッドを外嵌する貫通孔部を有して連結可能に複数に分割されており、
前記中継ロッドと拡径冶具との連結個所に、拡径冶具が前記中継ロッドに沿って摺動しないように拘束する拘束手段を設けてなることを特徴とする拡径冶具。 A relay rod connected to the propulsion rod is provided with a diameter expansion jig that is externally fitted to the relay rod and fixed detachably,
The diameter expansion jig has a through-hole part that externally fits the relay rod, and is divided into a plurality of pieces that can be connected,
A diameter expanding jig characterized in that a constraining means for restraining the diameter expanding jig from sliding along the relay rod is provided at a connecting portion between the relay rod and the diameter expanding jig. 拘束手段が、中継ロッドの外周壁面に、中継ロッドの軸方向に延びる凹凸係合の一方の構成部、または中継ロッドの軸心を中心とした外周方向に延びる凹凸係合の一方の構成部と、
拡径冶具の貫通孔の内周壁面に、前記一方の構成部に対応する位置で、該一方の構成部と嵌合する他方の構成部とからなることを特徴とした請求項１に記載の拡径冶具。 The restraining means is provided on the outer peripheral wall surface of the relay rod with one constituent part of the concave / convex engagement extending in the axial direction of the relay rod, or one constituent part of the concave / convex engagement extending in the outer peripheral direction around the axial center of the relay rod; ,
The inner peripheral wall surface of the through-hole of the diameter expansion jig is composed of the other constituent part fitted to the one constituent part at a position corresponding to the one constituent part. Expanding jig. 中継ロッドの外周面に水などの液体を噴射させる第１噴射孔を設けると共に、
拡径冶具の貫通孔部の内壁面で前記第１噴射孔と整合する位置に該内壁面から拡径冶具の外表面に貫通する第２噴射孔を設けてなることを特徴とする請求項１または２に記載の拡径冶具。 While providing a first injection hole for injecting a liquid such as water on the outer peripheral surface of the relay rod,
The second injection hole penetrating from the inner wall surface to the outer surface of the diameter expansion jig is provided at a position aligned with the first injection hole on the inner wall surface of the through hole portion of the diameter expansion jig. Or the diameter expansion jig of 2. 推進機から推進ロッドを到達立坑まで推進してパイロット削孔を形成する第１工程と、
到達立坑内で前記推進ロッドに中継ロッドを接続し、該中継ロッドに着脱可能な拡径冶具を固定して前記推進機でパイロット削孔内を引き戻して拡径冶具で前記パイロット削孔を事前拡径すると共に、前記引き込まれる中継ロッドに順次中継ロッドを継ぎ足していく第２工程と、
前記拡径冶具が発進立坑まで引き戻されると拡径冶具を中継ロッドから外し、
中継ロッドに継ぎ足されて到達立坑にある最後尾の中継ロッドの後方にバックリーマを接続し、該バックリーマの後方に埋設管の先端を接続し、推進機により前記事前拡径された坑道内に埋設管を引き込んで埋設する第３工程とからなり、
第２工程で使用する拡径冶具が、前記中継ロッドを外嵌する貫通孔部を有して連結可能に複数に分割されており、
前記中継ロッドと拡径冶具との連結個所に、拡径冶具が前記中継ロッドに沿って摺動しないように拘束する拘束手段を設けてなることを特徴とする非開削管埋設工法。 A first step of propelling a propulsion rod from a propulsion device to a shaft and forming a pilot hole;
A relay rod is connected to the propulsion rod in the reach shaft, a diameter expansion jig that can be attached to and detached from the relay rod is fixed, the pilot drill hole is pulled back by the propulsion unit, and the pilot hole is expanded beforehand by the diameter expansion jig. And a second step of sequentially adding a relay rod to the relay rod to be drawn,
When the diameter expansion jig is pulled back to the start shaft, the diameter expansion jig is removed from the relay rod,
A back reamer is connected to the rear of the last relay rod in the reach shaft that is added to the relay rod, and the tip of the buried pipe is connected to the back of the back reamer. And the third step of burying by burying the buried pipe,
The diameter expansion jig used in the second step has a through hole portion that externally fits the relay rod, and is divided into a plurality of pieces that can be connected,
A non-cut-tube embedding method, characterized in that a constraining means for restraining the diameter expansion jig from sliding along the relay rod is provided at a connecting portion between the relay rod and the diameter expansion jig.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7410631B2 (en) 2020-05-20 2024-01-10 株式会社ケー・エフ・シー Ground reinforcement method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7410631B2 (en) 2020-05-20 2024-01-10 株式会社ケー・エフ・シー Ground reinforcement method

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