JPH0941875A - Underground propelling device and underground propelling method - Google Patents
Underground propelling device and underground propelling methodInfo
- Publication number
- JPH0941875A JPH0941875A JP19875395A JP19875395A JPH0941875A JP H0941875 A JPH0941875 A JP H0941875A JP 19875395 A JP19875395 A JP 19875395A JP 19875395 A JP19875395 A JP 19875395A JP H0941875 A JPH0941875 A JP H0941875A
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- shaft
- buried pipe
- buried
- conduit
- 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
Landscapes
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、発進立坑から到達立
坑に向けて埋設管を推進して地中に埋設管を設置する地
中推進装置と地中推進方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underground propulsion device and a underground propulsion method for propelling a buried pipe from a starting shaft to a reaching shaft to install the buried pipe in the ground.
【０００２】[0002]
【従来の技術】発進立坑から到達立坑に向けて埋設管を
推進して該埋設管を地中に設置する地中推進方法におい
ては、まず比較的小径の先導管を推進しておき、この先
導管を案内として埋設管を推進する２工程式の地中推進
工法が知られている。図９は、従来の２工程式の地中推
進方法の一例を示す。2. Description of the Related Art In an underground propulsion method of propelling a buried pipe from a starting shaft to a reaching shaft and installing the buried pipe in the ground, first, a leading pipe having a relatively small diameter is first driven, and then this leading pipe is used. A two-step underground propulsion method is known in which a buried pipe is propelled by using as a guide. FIG. 9 shows an example of a conventional two-step underground propulsion method.
【０００３】この工法においては、図１２（ａ），
（ｂ）に示すように、まず先導管１００が推進機１０１
によって発進立坑１０２から到達立坑１０３に向けて推
進される。先導管１００が到達立坑１０３に到達した
ら、発進立坑１０２の側において掘削ビット１０４を先
導管１００に固定し、スクリュー１０５を掘削ビット１
０４の後方で先導管１００に固定する。図１２（ｃ）に
示すように、先導管１００と掘削ビット１０４とスクリ
ュー１０５を回転しながら推進すると共に、埋設管１０
６をスクリュー１０５に外挿して順次継ぎ足しながら推
進する。スクリュー１０５は埋設管１０６の内部で回転
しながら推進され、先導管１００は推進の進捗に応じて
到達立坑１０３に押し出されて順次回収されていく。埋
設管１０６が到達立坑１０３に到達したら、スクリュー
１０５を発進立坑１０２で回収する。In this construction method, as shown in FIG.
As shown in (b), first, the leading conduit 100 is the propulsion unit 101.
Is propelled from the starting shaft 102 toward the reaching shaft 103. When the leading conduit 100 reaches the reaching shaft 103, the drill bit 104 is fixed to the leading conduit 100 on the side of the starting shaft 102, and the screw 105 is mounted on the drill bit 1.
After 04, it is fixed to the front conduit 100. As shown in FIG. 12 (c), the tip pipe 100, the drill bit 104, and the screw 105 are rotated and propelled, and the buried pipe 10
6 is externally inserted into the screw 105, and is sequentially added and propelled. The screw 105 is propelled while rotating inside the buried pipe 106, and the leading conduit 100 is pushed out by the reaching vertical shaft 103 according to the progress of propulsion and is sequentially recovered. When the buried pipe 106 reaches the reaching shaft 103, the screw 105 is recovered in the starting shaft 102.
【０００４】[0004]
【発明が解決しようとする課題】前述した従来の２工程
式の地中推進方法によれば、スクリュー１０５が直接埋
設管１０６の内周面に接触して回転しながら土砂を搬送
するため、埋設管１０６の内周面に著しい傷が発生する
という問題があった。また、到達立坑１０３において先
導管１００を回収する必要があるため、到達立坑１０３
に人員やクレーン等の機器を配置する必要があり、不経
済であった。また、先導管１００の回収作業のために埋
設管１０６の推進作業を中断する必要があるという問題
もあった。また、発進立坑１０２と到達立坑１０３で同
時に作業を行うため、工事に必要な専有面積が大きく、
交通の妨げになるという問題もあった。また、埋設管１
０６の推進時には、先導管１００を同時に回転させなが
ら推進するため、過大な推進設備が必要であるという問
題があった。また、埋設管１０６の推進が進み、到達間
際になると、埋設管１０６を支持していた先導管１００
が短くなって支持力が低下するため、埋設管１０６の到
達精度が低下するという問題があった。According to the conventional two-step underground propulsion method described above, since the screw 105 directly contacts the inner peripheral surface of the buried pipe 106 and conveys the earth and sand while rotating, the buried There was a problem that the inner peripheral surface of the tube 106 was significantly scratched. Further, since it is necessary to collect the leading conduit 100 at the reaching shaft 103, the reaching shaft 103
It was uneconomical to arrange personnel and equipment such as cranes in the area. In addition, there is a problem in that it is necessary to interrupt the propulsion work of the buried pipe 106 for the recovery work of the leading conduit 100. Further, since the work is carried out at the starting shaft 102 and the reaching shaft 103 at the same time, a large occupation area is required for the construction,
There was also the problem of obstructing traffic. Also, the buried pipe 1
In the propulsion of 06, the propulsion equipment is too large because the propulsion is performed while simultaneously rotating the leading conduit 100, which is a problem. In addition, when the burial pipe 106 is promoted and is about to reach the destination, the front pipe 100 that was supporting the burial pipe 106 was reached.
Is shortened and the supporting force is reduced, so that there is a problem in that the arrival accuracy of the buried pipe 106 is reduced.
【０００５】本発明は、埋設管の内面に傷を付けず、小
さな推進力で精度の高い効率的な推進作業が行える２工
程式の地中推進装置及び地中推進方法を提供することを
目的としている。It is an object of the present invention to provide a two-step underground propulsion device and a underground propulsion method capable of performing highly accurate and efficient propulsion work with a small propulsion force without damaging the inner surface of the buried pipe. I am trying.
【０００６】[0006]
【課題を解決するための手段】請求項１に記載された地
中推進装置は、発進立坑から到達立坑に向けて埋設管を
推進して発進立坑と到達立坑の間の地中に埋設管を埋設
する地中推進装置において、発進立坑の内部に設置され
た推進機と、前記推進機によって発進立坑から到達立坑
に推進されて先端が到達立坑に固定される先導管と、前
記先導管を外挿しながら前記推進機によって推進される
前記埋設管の前端部の近傍に前記先導管を外挿した状態
で配置され、前記推進機によって回転しながら推進され
て地中を掘削する掘削体と、前記埋設管の内部において
前記先導管を外挿した状態で配置され、前記掘削体と前
記推進機とを連結して回転しながら推進されると共に、
前記掘削体が掘削した土砂を発進立坑に搬送する螺旋構
造を内周面に備えた内管とを有することを特徴としてい
る。An underground propulsion device according to claim 1 propels an embedded pipe from a starting vertical shaft to a reaching vertical shaft to insert the embedded pipe into the ground between the starting vertical shaft and the reaching vertical shaft. In the underground propulsion device to be buried, a propulsion device installed inside the starting shaft, a leading conduit that is propelled from the starting shaft to the reaching shaft by the propulsion device, and the tip is fixed to the reaching shaft, and the leading pipe An excavation body for excavating the ground by arranging the tip conduit in the vicinity of the front end portion of the buried pipe propelled by the propulsion device while being inserted, and being propelled while being rotated by the propulsion device to excavate in the ground; Arranged in a state where the tip conduit is externally inserted inside the buried pipe, and is propelled while rotating by connecting the excavator and the propulsion unit,
An inner pipe having a spiral structure on an inner peripheral surface for transporting the earth and sand excavated by the excavation body to a starting shaft.
【０００７】請求項２に記載された地中推進方法は、発
進立坑から到達立坑に向けて埋設管を推進して発進立坑
と到達立坑の間の地中に埋設管を埋設する地中推進方法
において、発進立坑から到達立坑に先導管を推進して先
導管の先端を到達立坑に固定し、掘削体と、前記掘削体
に連動連結されると共に前記掘削体が掘削した土砂を発
進立坑に搬送する螺旋構造を内周面に備えた内管とを、
前記先導管を外挿した状態で回転しながら推進すると共
に、前記内管を外挿して埋設管を推進することを特徴と
している。The underground propulsion method according to a second aspect of the present invention is an underground propulsion method in which a buried pipe is propelled from the starting shaft to the reaching shaft and the buried pipe is buried in the ground between the starting shaft and the reaching shaft. In, the propelling pipe from the starting shaft to the reaching shaft is fixed, and the tip of the leading pipe is fixed to the reaching shaft. An inner tube having a spiral structure on the inner peripheral surface,
It is characterized in that the tip conduit is externally inserted and rotated while being propelled, and the inner pipe is externally inserted to propel the embedded pipe.
【０００８】[0008]
【実施例】図１〜図８を参照して第１実施例の地中推進
装置１と、この地中推進装置１を利用した地中推進方法
を説明する。まず図１及び図２を参照して、第１実施例
の地中推進装置１の構造を説明する。この地中推進装置
１は、発進立坑から到達立坑に向けて先導管２と呼ばれ
る案内用の管を推進して固定し、固定された先導管２を
案内として埋設管３を推進し、発進立坑と到達立坑の間
の地中に埋設管３を埋設する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An underground propulsion apparatus 1 of the first embodiment and an underground propulsion method using the underground propulsion apparatus 1 will be described with reference to FIGS. First, the structure of the underground propulsion apparatus 1 of the first embodiment will be described with reference to FIGS. 1 and 2. This underground propulsion device 1 propels and fixes a guide pipe called a front conduit 2 from a start shaft to an arrival shaft, and guides a buried pipe 3 using the fixed front conduit 2 as a guide to start the shaft. The buried pipe 3 is buried in the ground between the and the reaching shaft.
【０００９】先導管２は発進立坑から到達立坑に向けて
推進される案内用の管である。先導管２は、発進立坑に
設置される推進機によって推進される。先導管２は、到
達立坑に到達した後に、その先端部が到達立坑に固定さ
れ、その後端部は推進機から切り離される。なお、推進
機は図１及び図２には示されていないが、推進力と回転
力を有している。先導管２の後端部には盲栓２ａが設け
られている。The leading conduit 2 is a guide pipe propelled from the starting shaft to the reaching shaft. The leading conduit 2 is propelled by a propulsion device installed in the starting shaft. After reaching the reaching shaft, the leading end of the leading conduit 2 is fixed to the reaching shaft, and the trailing end thereof is separated from the propulsion unit. Although not shown in FIGS. 1 and 2, the propulsion device has a propulsive force and a rotational force. A blind plug 2a is provided at the rear end of the front conduit 2.
【００１０】地中を掘削する掘削体としての拡大ヘッド
４が先導管２を外挿して設けられる。拡大ヘッド４は、
前後両端面が開口した円筒形の外筒体５を有しており、
その内径は埋設管３の外径よりも大きい。拡大ヘッド４
の外筒体５の前端の内面には、等角度間隔で複数本（本
実施例では３本）のステー６が設けられている。各ステ
ー６は、先導管２を案内する円筒形の案内部７を保持し
ている。案内部７の中心と外筒体５の中心は一致してお
り、案内部７の内面には先導管２に摺動自在に接触する
シール７ａが設けられている。外筒体５の前端部乃至ス
テー６には、掘削する土質等に応じて掘削ビットを設け
てもよい。An expansion head 4 as an excavation body for excavating the ground is provided by externally inserting the tip conduit 2. The expansion head 4
It has a cylindrical outer cylinder body 5 having open front and rear end surfaces,
The inner diameter is larger than the outer diameter of the buried pipe 3. Enlarging head 4
On the inner surface of the front end of the outer cylindrical body 5, a plurality of stays 6 (three in this embodiment) are provided at equal angular intervals. Each stay 6 holds a cylindrical guide portion 7 that guides the leading conduit 2. The center of the guide portion 7 and the center of the outer cylindrical body 5 are aligned with each other, and a seal 7a that slidably contacts the leading conduit 2 is provided on the inner surface of the guide portion 7. An excavation bit may be provided on the front end portion of the outer tubular body 5 or the stay 6 depending on the soil to be excavated.
【００１１】拡大ヘッド４の外筒体５は、その内部に後
述する内管２０の取り付け部８を有している。取り付け
部８は外筒体５と軸芯が一致した円筒体であり、その内
径は後述する内管２０の内径と同一である。取り付け部
８の内周面には掘削された土砂を搬送する螺旋構造とし
てのスパイラル９が設けられている。取り付け部８の内
部には、滑材が流通する滑材供給道１０が形成されてい
る。滑材供給道１０は取り付け部８の後端部に開口し、
また逆止弁１１を介して外筒体５の外周面に連通してい
る。取り付け部８の内部には、水が流通する注水道１２
が形成されている。注水道１２は取り付け部８の後端部
に開口し、また逆止弁１３を介して取り付け部８の前端
面に連通している。The outer cylinder body 5 of the expansion head 4 has a mounting portion 8 for an inner tube 20 described later therein. The mounting portion 8 is a cylindrical body whose axial center coincides with the outer cylindrical body 5, and the inner diameter thereof is the same as the inner diameter of the inner pipe 20 described later. A spiral 9 having a spiral structure that conveys excavated earth and sand is provided on the inner peripheral surface of the attachment portion 8. Inside the mounting portion 8, a lubricant supply passage 10 through which the lubricant circulates is formed. The lubricant supply passage 10 opens at the rear end of the mounting portion 8,
Further, it communicates with the outer peripheral surface of the outer cylindrical body 5 via a check valve 11. Water is circulated inside the mounting portion 8 through which water flows.
Are formed. The water supply 12 opens at the rear end of the mounting portion 8 and communicates with the front end surface of the mounting portion 8 via a check valve 13.
【００１２】拡大ヘッド４の取り付け部８の後端部に
は、先導管２を外挿した内管２０の先端部が連結され
る。内管２０の後端部は推進機に連動連結される。推進
機は、内管２０及び拡大ヘッド４を回転しながら推進す
る。内管２０は推進の進捗につれて継ぎ足されていく。
内管２０の内周面には掘削された土砂を搬送する螺旋構
造としてのスパイラル２１が設けられている。拡大ヘッ
ド４が掘削した土砂は取り付け部８から取り込まれ、回
転する内管２０のスパイラル２１によって内管２０の推
進方向と反対方向の発進立坑に向けて搬送される。To the rear end of the mounting portion 8 of the expansion head 4, the front end of the inner pipe 20 into which the front conduit 2 is inserted is connected. The rear end of the inner pipe 20 is interlockingly connected to the propulsion unit. The propulsion device propels the inner tube 20 and the expansion head 4 while rotating them. The inner pipe 20 is replenished as the promotion progresses.
On the inner peripheral surface of the inner pipe 20, a spiral 21 having a spiral structure that conveys the excavated earth and sand is provided. The earth and sand excavated by the expansion head 4 is taken in from the mounting portion 8 and conveyed by the spiral 21 of the rotating inner pipe 20 toward the starting shaft in the direction opposite to the propulsion direction of the inner pipe 20.
【００１３】内管２０の外周面には、滑材が流通する滑
材注入管２２が取り付けられている。滑材注入管２２は
拡大ヘッド４の取り付け部８の滑材供給道１０に連結さ
れている。内管２０の外周面には、水が流通する注水管
２３が取り付けられている。注水管２３は拡大ヘッド４
の取り付け部８の注水道１２に連結されている。滑材と
水は、発進立坑から拡大ヘッド４に向けて供給される。A lubricant injection pipe 22 through which a lubricant flows is attached to the outer peripheral surface of the inner pipe 20. The lubricant injection pipe 22 is connected to the lubricant supply passage 10 of the mounting portion 8 of the expansion head 4. A water injection pipe 23 through which water flows is attached to the outer peripheral surface of the inner pipe 20. The water injection pipe 23 is the expansion head 4
It is connected to the water supply 12 of the mounting part 8. The lubricant and water are supplied from the starting shaft to the expansion head 4.
【００１４】埋設管３は、内管２０を外挿した状態で推
進機によって地中に推進される。埋設管３の先端部は、
拡大ヘッド４の外筒体５の後端部に挿入されてシール１
５に接触している。埋設管３の内周面は、内管２０の外
周面に設けられた接触部材２４に接触している。本実施
例の接触部材２４は、内管２０及び埋設管３の軸線と平
行な軸線を中心に回転する樹脂製のころである。埋設管
３は、内管２０に対して周方向に回動自在である。The buried pipe 3 is propelled into the ground by a propulsion device with the inner pipe 20 inserted therein. The tip of the buried pipe 3 is
The seal 1 is inserted into the rear end of the outer cylindrical body 5 of the expansion head 4.
Touching 5. The inner peripheral surface of the embedded pipe 3 is in contact with the contact member 24 provided on the outer peripheral surface of the inner pipe 20. The contact member 24 of the present embodiment is a resin roller that rotates about an axis parallel to the axes of the inner pipe 20 and the buried pipe 3. The embedded pipe 3 is rotatable in the circumferential direction with respect to the inner pipe 20.
【００１５】図３〜図８を参照して第１実施例の地中推
進装置１を利用した地中推進方法を説明する。図３に示
すように、発進立坑３０の内部に推進機２５を設置す
る。図４に示すように、先導管２を推進機２５によって
推進する。先導管２は必要に応じて継ぎ足す。先導管２
の先端には斜切り管２ａを設け、推進方向に対して傾斜
した前面の向きを適宜に設定することによって推進方向
を修正する。An underground propulsion method using the underground propulsion apparatus 1 of the first embodiment will be described with reference to FIGS. As shown in FIG. 3, the propulsion unit 25 is installed inside the starting shaft 30. As shown in FIG. 4, the leading conduit 2 is propelled by the propulsion device 25. The tip conduit 2 is added as needed. Tip conduit 2
A slanting tube 2a is provided at the tip of the, and the propulsion direction is corrected by appropriately setting the direction of the front surface inclined with respect to the propulsion direction.
【００１６】図５に示すように、先導管２が到達立坑３
１に到達したら、到達立坑で斜切り管２ａを先端の先導
管２ｂから外して回収する。先端の先導管２ｂの先端部
を、到達立坑３１の側壁３１ａに固定金具３２で固定す
る。後端の先導管２ｃを推進機２５から外す。As shown in FIG. 5, the leading conduit 2 reaches the vertical shaft 3
When it reaches 1, the oblique cutting tube 2a is removed from the tip conduit 2b at the tip of the reaching shaft and recovered. The tip portion of the tip conduit 2b at the tip is fixed to the side wall 31a of the reaching shaft 31 with a fixing member 32. The front conduit 2c at the rear end is removed from the propulsion unit 25.
【００１７】図６に示すように、連結した拡大ヘッド４
と内管２０で先導管２を外挿すると共に、内管２０に埋
設管３を外挿して推進を行う。即ち、連結した拡大ヘッ
ド４と内管２０を回転しながら、固定された先導管２を
案内に推進して地盤を掘削し、推進する拡大ヘッド４に
続けて埋設管３を推進していく。As shown in FIG. 6, the expansion head 4 is connected.
The outer pipe 2 is externally inserted by the inner pipe 20, and the embedded pipe 3 is externally inserted in the inner pipe 20 to perform propulsion. That is, while rotating the expansion head 4 and the inner pipe 20 connected to each other, the fixed leading conduit 2 is guided as a guide to excavate the ground, and the buried pipe 3 is propelled following the expanding head 4 which is propelled.
【００１８】拡大ヘッド４で掘削された土砂は、取り付
け部８から内管２０の内部に取り込まれ、回転する内管
２０のスパイラル２１によって内管２０及び埋設管３の
推進方向と反対方向の発進立坑３０に向けて搬送されて
いく。The earth and sand excavated by the expansion head 4 is taken into the inside of the inner pipe 20 from the mounting portion 8 and is started by the spiral 21 of the rotating inner pipe 20 in the direction opposite to the propulsion direction of the inner pipe 20 and the buried pipe 3. It is conveyed toward the vertical shaft 30.
【００１９】従来のように埋設管の内部でスクリューを
直接回転させるのと異なり、本実施例の埋設管３は、回
転する内管２０に接触部材２４を介して接触するのみで
あり、鋭利なスクリューや掘削ズリとは接触せず、その
内面に使用上問題になるような傷は付かない。特に、埋
設管３が傷つきやすい塩化ビニール製の管である場合等
に、本実施例の工法は有効である。Unlike the conventional method in which the screw is directly rotated inside the buried pipe, the buried pipe 3 of the present embodiment only comes into contact with the rotating inner pipe 20 through the contact member 24, which is sharp. It does not come into contact with the screw or excavator and does not have scratches on its inner surface that may cause problems in use. In particular, the construction method of this embodiment is effective when the buried pipe 3 is a pipe made of vinyl chloride that is easily damaged.
【００２０】推進時、注水管２３に供給された水は、拡
大ヘッド４の取り付け部８の注水道１２に供給され、逆
止弁１３を開放して拡大ヘッド４の内部に供給され、土
砂の搬送を容易にする。また、滑材注入管２２に供給さ
れた滑材は、拡大ヘッド４の取り付け部８の滑材供給道
１０に供給され、逆止弁１１を開放して拡大ヘッド４の
外周面に供給され、埋設管３の外周面が受ける推進抵抗
を低減する。即ち埋設管３に過大な推進力が加わること
がない。At the time of propulsion, the water supplied to the water injection pipe 23 is supplied to the water supply 12 of the mounting portion 8 of the expansion head 4, the check valve 13 is opened, and the water is supplied to the inside of the expansion head 4. Make it easy to transport. Further, the lubricant supplied to the lubricant injection pipe 22 is supplied to the lubricant supply passage 10 of the mounting portion 8 of the expansion head 4, the check valve 11 is opened, and the lubricant is supplied to the outer peripheral surface of the expansion head 4. The propulsive resistance applied to the outer peripheral surface of the buried pipe 3 is reduced. That is, no excessive propulsive force is applied to the buried pipe 3.
【００２１】本実施例では、拡大ヘッド４、内管２０及
び埋設管３の推進時の案内部材である先導管２が固定さ
れているので、推進が進んで拡大ヘッド４が到達立坑３
１に近接した位置にきて先導管２に大きな力が加わるよ
うになっても、先導管２の位置がずれることがなく、推
進方向の精度を高く保つことができる。In the present embodiment, the expansion head 4, the inner pipe 20, and the leading conduit 2, which is a guide member for propelling the buried pipe 3, are fixed, so that the expansion head 4 reaches the vertical shaft 3 by the propulsion.
Even when a large force is applied to the front conduit 2 when it comes to a position close to 1, the position of the front conduit 2 does not shift, and the accuracy of the propulsion direction can be kept high.
【００２２】図７に示すように、拡大ヘッド４が到達立
坑３１に到達したら、該拡大ヘッド４を到達立坑３１で
回収する。また、先導管２及び内管２０を推進機２５に
よって発進立坑３０に引き抜き、回収する。そして、図
８に示すように推進機２５を発進立坑３０から撤去す
る。発進立坑３０と到達立坑３１の間の地中には、埋設
管３が設置される。As shown in FIG. 7, when the expanding head 4 reaches the reaching shaft 31, the expanding head 4 is recovered in the reaching shaft 31. Further, the leading conduit 2 and the inner pipe 20 are pulled out to the starting shaft 30 by the propulsion device 25 and collected. Then, as shown in FIG. 8, the propulsion device 25 is removed from the starting shaft 30. The buried pipe 3 is installed in the ground between the starting shaft 30 and the reaching shaft 31.
【００２３】図９〜図１１を参照して第２実施例の地中
推進装置５０と、この地中推進装置５０を利用した地中
推進方法を説明する。まず図９を参照して、第２実施例
の地中推進装置５０の構造を説明する。この地中推進装
置は、第１実施例と同一の先導管２を案内として埋設管
３を推進し、発進立坑３０と到達立坑３１の間の地中に
埋設管３を埋設するものである。なお、本実施例におい
て、前記第１実施例と構成が略同一の部分については、
図中に第１実施例と同一の符号を付して詳細な説明は省
略する。A subsurface propulsion apparatus 50 of the second embodiment and a subsurface propulsion method using the subsurface propulsion apparatus 50 will be described with reference to FIGS. 9 to 11. First, the structure of the underground propulsion apparatus 50 of the second embodiment will be described with reference to FIG. This underground propulsion device propels the buried pipe 3 by using the same leading conduit 2 as that of the first embodiment as a guide, and burys the buried pipe 3 in the ground between the starting shaft 30 and the reaching shaft 31. In addition, in the present embodiment, as for the portion having substantially the same configuration as the first embodiment,
In the figure, the same reference numerals as those in the first embodiment are attached and detailed description is omitted.
【００２４】地中を掘削する掘削体としての拡大ヘッド
５１が先導管２を外挿して設けられる。拡大ヘッド５１
は、前後両端面が開口した円筒形の外筒体５２を有して
おり、その外径は埋設管３の外形と略同一である。拡大
ヘッド４の外筒体５２の前端の内面には、複数本のステ
ー６に支えられた円筒形の案内部７が設けられている。
外筒体５２の前端部外周面乃至ステー６には、掘削する
土質等に応じて掘削ビットが設けられている。An enlarged head 51 as an excavation body for excavating the ground is provided by externally inserting the front conduit 2. Enlarging head 51
Has a cylindrical outer cylindrical body 52 having open front and rear end surfaces, and its outer diameter is substantially the same as the outer shape of the buried pipe 3. A cylindrical guide portion 7 supported by a plurality of stays 6 is provided on the inner surface of the front end of the outer cylindrical body 52 of the expansion head 4.
An excavation bit is provided on the outer peripheral surface of the front end portion of the outer tubular body 52 to the stay 6 depending on the soil to be excavated.
【００２５】拡大ヘッド４の外筒体５２の後端には、内
管２０を取り付ける小径の取り付け部５３が同軸に設け
られている。取り付け部５３の内周面には掘削された土
砂を搬送する螺旋構造としてのスパイラル９が設けられ
ている。取り付け部５３の外部には、滑材が流通する滑
材供給道１０と、水が流通する注水道１２が形成されて
いる。At the rear end of the outer cylindrical body 52 of the expansion head 4, a small-diameter mounting portion 53 for mounting the inner tube 20 is coaxially provided. On the inner peripheral surface of the mounting portion 53, a spiral 9 having a spiral structure that conveys excavated earth and sand is provided. Outside the attachment portion 53, a lubricant supply passage 10 through which the lubricant flows and a water supply 12 through which water flows are formed.
【００２６】拡大ヘッド５１の取り付け部５３の後端部
には、先導管２を外挿した内管２０の先端部が連結され
る。内管２０の構造及び駆動機構、内管２０の継ぎ足し
方法等は第１実施例と同一である。To the rear end of the mounting portion 53 of the expansion head 51, the front end of the inner pipe 20 into which the front conduit 2 is inserted is connected. The structure and drive mechanism of the inner pipe 20, the method of adding the inner pipe 20, and the like are the same as in the first embodiment.
【００２７】埋設管３は、内管２０を外挿した状態で推
進機によって地中に推進される。埋設管３の先端部には
ねじ部３ａが形成されている。埋設管３の先端のねじ部
３ａは、バックアップパイプ５５の後端部のねじ部５５
ａにねじ込まれている。バックアップパイプ５５は、埋
設管３や前記拡大ヘッド４と略同一の外径を有する管で
あり、その先端はパッキン５６を介して拡大ヘッド５１
の取り付け部５３を外挿する。バックアップパイプ５５
により、埋設管３と拡大ヘッド５１の間から土砂が流入
することが防止される。埋設管３の内周面は、内管２０
の外周面に設けられた接触部材２４に接触している。The buried pipe 3 is propelled into the ground by a propulsion device with the inner pipe 20 inserted externally. A threaded portion 3 a is formed at the tip of the embedded pipe 3. The threaded portion 3 a at the tip of the buried pipe 3 is the threaded portion 55 at the rear end of the backup pipe 55.
It is screwed into a. The backup pipe 55 is a pipe having an outer diameter substantially the same as that of the buried pipe 3 and the expansion head 4, and the tip of the backup pipe 55 is covered with a packing 56.
The attachment portion 53 of is attached. Backup pipe 55
Thereby, the inflow of earth and sand from between the buried pipe 3 and the expansion head 51 is prevented. The inner peripheral surface of the buried pipe 3 is the inner pipe 20.
Is in contact with the contact member 24 provided on the outer peripheral surface of the.
【００２８】本実施例によっても、前述した第１実施例
と略同様の手順で埋設管の推進作業を行うことができ
る。即ち、図１０及び図１１に示すように、到達坑３１
に固定された先導管２を案内として拡大ヘッド５１及び
内管２０を回転しながら推進し、内管２０を外挿する埋
設管３を拡大ヘッド５１の後方から推進していく。掘削
された土砂は、拡大ヘッド５１に取り込まれ、内管２０
のスパイラル２１によって発進坑３０内に搬送される。Also in this embodiment, the propulsion work of the buried pipe can be carried out in substantially the same procedure as in the first embodiment. That is, as shown in FIG. 10 and FIG.
The expansion head 51 and the inner tube 20 are rotated and propelled while the front conduit 2 fixed to the inner tube 20 is guided, and the embedded tube 3 into which the inner tube 20 is externally inserted is propelled from the rear of the expansion head 51. The excavated earth and sand is taken into the expansion head 51, and the inner pipe 20
The spiral 21 is carried into the starting pit 30.
【００２９】埋設管３の先端は、拡大ヘッド５１を直接
外挿しておらず、バックアップパイプ５５及びパッキン
５６を介して拡大ヘッド５１に取り付けられている。従
って、埋設管３の先端部の内面には傷がつきにくい。ま
た、埋設管３の内部に土砂が入り込むこともない。な
お、埋設管３と内管２０との間には接触部材２４がある
ので、第１実施例と同様に埋設管３の内面には傷がつき
にくい。The tip of the buried pipe 3 is attached to the expansion head 51 via a backup pipe 55 and a packing 56 without directly inserting the expansion head 51. Therefore, the inner surface of the tip portion of the buried pipe 3 is not easily scratched. Further, the earth and sand do not enter the inside of the buried pipe 3. Since the contact member 24 is provided between the buried pipe 3 and the inner pipe 20, the inner surface of the buried pipe 3 is not easily scratched as in the first embodiment.
【００３０】[0030]
【発明の効果】本発明によれば、固定した先導管を外挿
して、掘削体と内周に螺旋構造を有する内管とによって
掘削を行い、埋設管は内管を外挿して推進するようにし
たので、次のような効果が得られる。According to the present invention, a fixed tip conduit is externally inserted, and excavation is performed by an excavation body and an inner pipe having a spiral structure on the inner circumference, and a buried pipe is inserted and propelled by inserting the inner pipe. As a result, the following effects can be obtained.
【００３１】スクリューが直接埋設管の内周面に接触し
て回転しながら土砂を搬送するため、埋設管の内周面に
著しい傷が発生する前述した従来の２工程式の地中推進
方法と異なり、埋設管の内面には傷が付かない。Since the screw directly contacts the inner peripheral surface of the buried pipe and conveys the earth and sand while rotating, a significant damage is generated on the inner peripheral surface of the buried pipe. Unlike, the inner surface of the buried pipe is not scratched.
【００３２】到達立坑において先導管を回収する必要が
ないため、到達立坑に多くの人員やクレーン等の機器を
配置する必要がなく、経済的である。また、先導管回収
作業のために埋設管の推進作業を中断する必要がなく、
埋設管の連続推進ができる。Since it is not necessary to recover the leading conduit in the reaching shaft, it is economical because it is not necessary to arrange many personnel and equipment such as cranes in the reaching shaft. In addition, it is not necessary to interrupt the work of promoting the buried pipe for the work of collecting the front pipe,
The continuous promotion of the buried pipe is possible.
【００３３】発進立坑と到達立坑で同時に作業を行う必
要が殆どなく、埋設管推進時の作業は発進立坑だけで行
うので、工事に必要な専有面積が小さく、交通の障害が
少ない。There is almost no need to perform work simultaneously on the starting shaft and the reaching shaft, and since the work at the time of propulsing the buried pipe is performed only on the starting shaft, the occupation area required for construction is small and there are few traffic obstacles.
【００３４】先導管は固定されて推進されず、埋設管の
推進時には掘削体と内管のみの荷重に対する設備が必要
であり、過大な推進設備が必要ない。埋設管が到達する
間際になって埋設管を支持していた先導管が短くなって
も、先導管が固定されているため支持力が低下すること
がなく、埋設管の到達精度が高い。The tip conduit is fixed and not propelled, and when propelling the buried pipe, equipment for the load of only the excavation body and the inner pipe is required, and no excessive propelling equipment is required. Even if the leading pipe that supported the buried pipe becomes short in time just before the buried pipe arrives, since the leading pipe is fixed, the supporting force does not decrease and the arrival accuracy of the buried pipe is high.
【図１】（ａ）は第１実施例の地中推進装置の断面図、
（ｂ）は（ａ）のａ−ａ切断線における断面図、（ｃ）
は（ａ）のｃ−ｃ切断線における断面図である。FIG. 1A is a sectional view of an underground propulsion device according to a first embodiment,
(B) is sectional drawing in the aa cutting line of (a), (c)
FIG. 7A is a cross-sectional view taken along line cc of (a).
【図２】第１実施例の地中推進装置の断面図である。FIG. 2 is a cross-sectional view of the underground propulsion device of the first embodiment.
【図３】第１実施例の地中推進方法の一工程を示す断面
図である。FIG. 3 is a cross-sectional view showing one step of the underground propulsion method of the first embodiment.
【図４】第１実施例の地中推進方法の一工程を示す断面
図である。FIG. 4 is a cross-sectional view showing one step of the underground propulsion method of the first embodiment.
【図５】第１実施例の地中推進方法の一工程を示す断面
図である。FIG. 5 is a cross-sectional view showing a step of the underground propulsion method of the first embodiment.
【図６】第１実施例の地中推進方法の一工程を示す断面
図である。FIG. 6 is a cross-sectional view showing one step of the underground propulsion method of the first embodiment.
【図７】第１実施例の地中推進方法の一工程を示す断面
図である。FIG. 7 is a cross-sectional view showing one step of the underground propulsion method of the first embodiment.
【図８】第１実施例の地中推進方法の一工程を示す断面
図である。FIG. 8 is a cross-sectional view showing one step of the underground propulsion method of the first embodiment.
【図９】第２実施例の地中推進装置の断面図である。FIG. 9 is a sectional view of an underground propulsion device of a second embodiment.
【図１０】第２実施例の地中推進装置による地中推進方
法の一工程を示す断面図である。FIG. 10 is a cross-sectional view showing a step in the underground propulsion method by the underground propulsion device of the second embodiment.
【図１１】第２実施例の地中推進装置による地中推進方
法の一工程を示す断面図である。FIG. 11 is a cross-sectional view showing one step of an underground propulsion method by the underground propulsion device of the second embodiment.
【図１２】従来の２工程式の地中推進方法の一例を示す
断面図である。FIG. 12 is a cross-sectional view showing an example of a conventional two-step underground propulsion method.
１，５０ 地中推進装置 ２ 先導管 ３ 埋設管 ４，５１ 掘削体としての拡大ヘッド ２０ 内管 ２１ 螺旋構造としてのスパイラル ２５ 推進機 1,50 Underground propulsion device 2 Front conduit 3 Buried pipe 4,51 Expansion head as excavation body 20 Inner pipe 21 Spiral as spiral structure 25 Propulsion device
Claims (2)
推進して発進立坑と到達立坑の間の地中に埋設管を埋設
する地中推進装置において、 発進立坑の内部に設置された推進機と、 前記推進機によって発進立坑から到達立坑に推進されて
先端が到達立坑に固定される先導管と、 前記先導管を外挿しながら前記推進機によって推進され
る前記埋設管の前端部の近傍に前記先導管を外挿した状
態で配置され、前記推進機によって回転しながら推進さ
れて地中を掘削する掘削体と、 前記埋設管の内部において前記先導管を外挿した状態で
配置され、前記掘削体と前記推進機とを連結して回転し
ながら推進されると共に、前記掘削体が掘削した土砂を
発進立坑に搬送する螺旋構造を内周面に備えた内管とを
有する地中推進装置。1. A submersible propulsion device for propelling a buried pipe from a starting vertical shaft to a reaching vertical shaft and burying the buried pipe in the ground between the starting vertical shaft and the reaching vertical shaft. Machine, a leading conduit whose tip is fixed to the reaching shaft by being propelled from the starting shaft to the reaching shaft by the propulsion device, and a front end portion of the buried pipe which is propelled by the propulsion device while extrapolating the leading conduit. Is arranged in a state where the tip conduit is extrapolated to, an excavation body that is propelled while being rotated by the propulsion device to excavate in the ground, and is arranged in a state where the tip conduit is extrapolated inside the buried pipe, Underground propulsion having an inner pipe having a spiral structure on the inner peripheral surface, which is connected to the excavator and is propelled while rotating, and is propelled while transporting the earth and sand excavated by the excavator to a starting shaft. apparatus.
推進して発進立坑と到達立坑の間の地中に埋設管を埋設
する地中推進方法において、 発進立坑から到達立坑に先導管を推進して先導管の先端
を到達立坑に固定し、掘削体と、前記掘削体に連動連結
されると共に前記掘削体が掘削した土砂を発進立坑に搬
送する螺旋構造を内周面に備えた内管とを、前記先導管
を外挿した状態で回転しながら推進すると共に、前記内
管を外挿して埋設管を推進することを特徴とする地中推
進方法。2. In the underground propulsion method of burying a buried pipe in the ground between the starting shaft and the reaching shaft by propelling the buried pipe from the starting shaft to the reaching shaft, a leading conduit is provided from the starting shaft to the reaching shaft. The tip of the leading conduit is fixed to the reaching shaft by propelling it, and the inner peripheral surface of the excavation body is provided with a spiral structure that is interlocked with the excavation body and that conveys the earth and sand excavated by the excavation body to the starting shaft. A pipe and a pipe are propelled while rotating in a state where the tip conduit is externally inserted, and the inner pipe is externally inserted to propel a buried pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19875395A JPH0941875A (en) | 1995-08-03 | 1995-08-03 | Underground propelling device and underground propelling method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19875395A JPH0941875A (en) | 1995-08-03 | 1995-08-03 | Underground propelling device and underground propelling method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0941875A true JPH0941875A (en) | 1997-02-10 |
Family
ID=16396396
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19875395A Pending JPH0941875A (en) | 1995-08-03 | 1995-08-03 | Underground propelling device and underground propelling method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0941875A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008013927A (en) * | 2006-07-03 | 2008-01-24 | Nippon Densetsu Kogyo Co Ltd | Pipe jacking method and pipe jacking device |
-
1995
- 1995-08-03 JP JP19875395A patent/JPH0941875A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008013927A (en) * | 2006-07-03 | 2008-01-24 | Nippon Densetsu Kogyo Co Ltd | Pipe jacking method and pipe jacking device |
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