JP3455509B2 - Press-in method - Google Patents
Press-in methodInfo
- Publication number
- JP3455509B2 JP3455509B2 JP2000322723A JP2000322723A JP3455509B2 JP 3455509 B2 JP3455509 B2 JP 3455509B2 JP 2000322723 A JP2000322723 A JP 2000322723A JP 2000322723 A JP2000322723 A JP 2000322723A JP 3455509 B2 JP3455509 B2 JP 3455509B2
- Authority
- JP
- Japan
- Prior art keywords
- press
- insertion tube
- tip
- ground
- fitting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Excavating Of Shafts Or Tunnels (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、杭打機のように挿
入管を地中に圧入し、地中に下水道管路や他の配管を敷
設する際の圧入推進工法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press-fitting propulsion method for press-fitting an insertion pipe into the ground such as a pile driver and laying a sewer pipe or other pipes in the ground.
【０００２】[0002]
【従来の技術】圧入推進工法を用いて地中に配管を敷設
する方法は、先ず、敷設すべき管路の予定敷設線上に発
進立坑と到着立坑を構築し、発進立坑に設置した元押装
置による押込みによって先端装置を地中に押込み、その
後、先端装置に挿入管を接続して再び元押装置により先
端装置を地中に押込むようにしたものである。そして先
端装置が到達立坑に到着したとき、発進立坑と到着立坑
との間に連続した挿入管による管路が形成される。2. Description of the Related Art A method of laying a pipe in the ground by using a press-fitting propulsion method is as follows. First, a starting shaft and an arrival shaft are constructed on a planned laying line of a pipeline to be laid, and an original pushing device installed in the starting shaft. The tip device is pushed into the ground by pushing with, and then the insertion tube is connected to the tip device and the tip device is pushed into the ground again by the former pushing device. When the tip device arrives at the arrival shaft, a continuous pipe line is formed between the starting shaft and the arrival shaft.
【０００３】図１１は従来の圧入推進工法を実施する推
進装置の一例を示している。図１１の推進装置を構成し
ている元押装置１は、地中に形成した発進立坑２の底部
に案内台３を設け、該案内台３に、所要の伸縮ストロー
クを有するシリンダ４の基端を取付けている。更に、シ
リンダ４のシリンダロッド５の先端部には、シリンダ４
の伸縮により案内台３上面に沿って移動するようにした
押し板６を取付けている。FIG. 11 shows an example of a propulsion device for implementing a conventional press-fitting propulsion method. The pusher device 1 constituting the propulsion device of FIG. 11 is provided with a guide base 3 at the bottom of a starting shaft 2 formed in the ground, and the guide base 3 has a base end of a cylinder 4 having a required expansion / contraction stroke. Is installed. Further, at the tip of the cylinder rod 5 of the cylinder 4, the cylinder 4
The push plate 6 is attached so as to move along the upper surface of the guide base 3 by expansion and contraction.
【０００４】図１１中、７は前記押し板６により後端が
押されて地中に推進される先端装置であり、該先端装置
７は、その先端に推進を容易にするための略円錐面８が
形成されており、また、先端装置７は推進を容易にする
ために、内部に図示しない振動発生装置などを備えてい
る。In FIG. 11, reference numeral 7 denotes a tip device whose rear end is pushed by the pushing plate 6 and is propelled into the ground. The tip device 7 has a substantially conical surface at its tip for facilitating the propulsion. 8 is formed, and the tip device 7 is provided with a vibration generator (not shown) or the like therein for facilitating propulsion.
【０００５】９は前記先端装置７の後端に嵌合部を介し
て接続するようにした挿入管であり、該挿入管９は、そ
の後端に別の挿入管９を嵌合部を介して接続することが
でき、後端を前記押し板６により押されて先端装置７と
共に地中に押込まれるようになっている。挿入管９は、
それ自体がトンネルを構成するための鋼管、塩ビ管等で
あったり、或いは後でトンネルを構築するための仮管で
ある場合もある。Reference numeral 9 denotes an insertion tube connected to the rear end of the tip device 7 through a fitting portion. The insertion tube 9 has another insertion tube 9 at its rear end through a fitting portion. It can be connected, and the rear end is pushed by the pushing plate 6 and is pushed into the ground together with the tip device 7. The insertion tube 9 is
It may itself be a steel pipe, a PVC pipe, or the like for forming a tunnel, or a temporary pipe for constructing a tunnel later.
【０００６】前記先端装置７と挿入管９とは略同一長さ
を有しており、更にシリンダ４は、前記先端装置７及び
挿入管９の長さより長い伸縮ストロークを有している。The tip device 7 and the insertion tube 9 have substantially the same length, and the cylinder 4 has a telescopic stroke longer than the length of the tip device 7 and the insertion tube 9.
【０００７】上記推進装置では、先ず、シリンダ４を縮
小して押し板６を最後部まで後退させた状態において、
押し板６の前側に先端装置７を設置する。続いて、シリ
ンダ４を押込み終端（ストロークエンド）まで伸長する
と、先端装置７は押し板６を介して地中に推進される。In the above propulsion device, first, in a state where the cylinder 4 is contracted and the push plate 6 is retracted to the rearmost part,
The tip device 7 is installed on the front side of the push plate 6. Subsequently, when the cylinder 4 is extended to the pushing end (stroke end), the tip device 7 is propelled into the ground via the pushing plate 6.
【０００８】つぎに、シリンダ４を縮小して押し板６を
最後部まで後退させた状態とし、先端装置７の後端に挿
入管９を接続配置する。再び、シリンダ４を押込み終端
（ストロークエンド）まで伸長すると、挿入管９と先端
装置７は押し板６を介して地中に推進される。上記操作
を繰返すことにより、地中に管路を形成する。Next, the cylinder 4 is contracted so that the push plate 6 is retracted to the end, and the insertion tube 9 is connected to the rear end of the tip device 7. When the cylinder 4 is extended again to the push-in end (stroke end), the insertion tube 9 and the tip device 7 are propelled into the ground via the push plate 6. By repeating the above operation, a pipeline is formed in the ground.
【０００９】[0009]
【発明が解決しようとする課題】上記推進装置では、シ
リンダ４が挿入管９の長さ分の伸縮ストロークを有して
いれば、シリンダ４の伸縮によって挿入管９を地中に進
入させることができる。In the above propulsion device, if the cylinder 4 has an expansion / contraction stroke corresponding to the length of the insertion tube 9, the expansion / contraction of the cylinder 4 allows the insertion tube 9 to enter the ground. it can.
【００１０】しかし、図１１に示すように、シリンダ４
を伸長して挿入管９及び先端装置７を押込んだ状態で
は、先端装置７の前側の地中に、非常に高い圧力Ｐ1を
有する高圧力部１０が形成される。従って、一本の挿入
管９の押込みが終了して、次の挿入管９の押込みを行う
ために、図１２に示すようにシリンダ４を縮小して押し
板６を後退させると、高圧力部１０の高い圧力Ｐ1によ
って先端装置７が押し戻され、これに伴って挿入管９が
発進立坑２側に押し戻される後退Ｂが生じる。後退Ｂに
よって高圧力部１０の高い圧力Ｐ1は低い圧力Ｐ2となる
が、この圧力Ｐ2と先端装置７及び挿入管９を押し戻す
際の摩擦抵抗とがバランスする位置まで後退Ｂを生じ
る。However, as shown in FIG. 11, the cylinder 4
In the state in which the insertion tube 9 and the tip device 7 are pushed in after being extended, a high pressure portion 10 having a very high pressure P 1 is formed in the ground on the front side of the tip device 7. Therefore, when the pushing of one insertion tube 9 is completed and the next insertion tube 9 is pushed in, the cylinder 4 is contracted and the push plate 6 is retracted as shown in FIG. The tip device 7 is pushed back by the high pressure P 1 of 10, and the retreat B in which the insertion tube 9 is pushed back to the starting shaft 2 side occurs. Due to the retreat B, the high pressure P 1 of the high pressure portion 10 becomes a low pressure P 2 , but the retreat B occurs up to a position where this pressure P 2 and the friction resistance when pushing back the tip device 7 and the insertion tube 9 are balanced.
【００１１】図１２のように挿入管９の後退Ｂが生じる
と、最後部の挿入管９と後退させた押し板６の前面との
間が、本来あるベき間隔Ｌ1に対して後退Ｂ分だけ小さ
くなった間隔Ｌ2となり、このために長さＬ3の挿入管９
を設置することができなくなり、よって挿入管９の推進
が不可能になってしまう。When the retreat B of the insertion tube 9 occurs as shown in FIG. 12, the retreat B between the rearmost insertion tube 9 and the front surface of the retracted push plate 6 with respect to the original clearance L 1 . The distance L 2 is reduced by that amount, and for this reason, the insertion tube 9 of length L 3 is
Can no longer be installed and thus the insertion tube 9 cannot be propelled.
【００１２】従って、挿入管９の押し込みには、後退Ｂ
を想定してその分だけ余分に押込む必要があり、そのた
めには余分のストロークを有する長いシリンダ４を設置
する必要がある。このために、元押装置１が大型化する
問題がある。更に、元押装置１が大型化すると、地中に
掘削する発進立坑２の前後長さも長くする必要があり、
よって掘削費用が増加したり、或いは用地上の制限を受
けるなどの問題が生じる。Therefore, when pushing the insertion tube 9, the backward movement B
Therefore, it is necessary to push in an extra amount by that amount, and for that purpose, it is necessary to install a long cylinder 4 having an extra stroke. For this reason, there is a problem that the original pushing device 1 becomes large. Furthermore, when the original pusher 1 becomes larger, it is necessary to lengthen the front-rear length of the starting shaft 2 to be excavated in the ground.
As a result, problems such as an increase in excavation costs and restrictions on the site arise.
【００１３】更に、前記した後退Ｂの発生は、操作対象
外の動きであるために作業に危険を伴う可能性がある。Further, the occurrence of the retreat B described above may cause a danger in the work because it is a movement outside the operation target.
【００１４】また、図１１、図１２に示したように、シ
リンダ４の１回のストロークで挿入管９を圧入する方式
以外に、盛替え方式が通常使われている。この盛替え方
式は、横方向に間隔をおいて平行に配置したシリンダと
押し板をピンにて連結する事により押し板を押圧し、シ
リンダに対するピンの連結位置を盛替えることにより、
シリンダストロークの約２倍の推進管を押込むようにし
たものである。この方式によれば、１回のストロークで
挿入管を押込む方法に比して元押装置１の長さを大幅に
短縮することが可能となる。Further, as shown in FIGS. 11 and 12, in addition to the method of press-fitting the insertion tube 9 with one stroke of the cylinder 4, the refilling method is usually used. This rearrangement method presses the push plate by connecting the cylinder and the push plate that are arranged in parallel at a distance in the lateral direction with the pin, and by changing the connecting position of the pin to the cylinder,
The propulsion pipe is pushed in about twice the cylinder stroke. According to this method, the length of the original pushing device 1 can be significantly shortened as compared with the method of pushing the insertion tube with one stroke.
【００１５】しかし、この盛替え方式においても、挿入
管の後退が生じると、やはりその分だけシリンダの長さ
を長くする必要が生じて元押装置が大型化することにな
り、よって発進立坑の前後長さも大きくなるという問題
がある。However, even in this rearrangement method, if the insertion tube is retracted, the cylinder length must be increased by that amount, and the original pushing device becomes large, so that the starting shaft of the starting shaft is increased. There is a problem that the front-rear length also becomes large.
【００１６】本発明は、かかる従来の問題点を解決すべ
くなしたもので、挿入管の後退を防止して、元押装置及
び発進立坑を小型化し、且つ作業の安全性と作業性の向
上とを図れるようにした圧入推進工法を提供することを
目的としている。The present invention has been made to solve the above-mentioned conventional problems, and prevents the insertion tube from retreating, reduces the size of the starting pusher and the starting shaft, and improves work safety and workability. The purpose is to provide a press-fitting propulsion method capable of achieving the following.
【００１７】[0017]
【課題を解決するための手段】本発明は、発進立坑に備
えられる元押装置により挿入管を介して先端装置を地中
に推進させる圧入推進工法であって、圧入先端部と後部
筒体とを伸縮ジャッキにより連結した先端装置を設け、
伸縮ジャッキを伸長して圧入先端部が張出した状態の先
端装置を、元押装置の伸長により挿入管を介して地中に
推進させ、元押装置が押込み終端になった時、伸縮ジャ
ッキを縮小して圧入先端部を引込めた後に元押装置の縮
小を行うことにより、地山からの反力を低減して挿入管
の後退を防止することを特徴とする圧入推進工法、に係
るものである。DISCLOSURE OF THE INVENTION The present invention is a press-fitting propulsion method for propelling a tip device into the ground through an insertion tube by means of a source pushing device provided in a starting shaft, which comprises a press-fitting tip portion and a rear tubular body. Provide a tip device that is connected by a telescopic jack,
When the extension device is extended and the press-fit tip is extended, the extension device pushes the extension device into the ground through the insertion tube, and when the extension device reaches the pushing end, the extension jack shrinks. After the press-fitting tip is retracted, the original pushing device is reduced to reduce the reaction force from the ground and prevent the insertion tube from retracting. is there.
【００１８】本発明は、発進立坑に備えられる元押装置
により挿入管を介して先端装置を地中に推進させる圧入
推進工法であって、圧入先端部と後部筒体とを伸縮ジャ
ッキにより連結した先端装置を設け、伸縮ジャッキを縮
小して圧入先端部が引込められた状態の先端装置を、元
押装置の伸長により挿入管を介して地中に推進させ、元
押装置が押込み終端になった時、伸縮ジャッキを伸長し
て圧入先端部を地中に押込み、続いて伸縮ジャッキを縮
小して圧入先端部を引込めた後に元押装置の縮小を行う
ことにより、地山からの反力を低減して挿入管の後退を
防止することを特徴とする圧入推進工法、に係るもので
ある。The present invention is a press-fitting propulsion method in which the tip end device is propelled into the ground through the insertion tube by the source pushing device provided in the starting shaft, and the press-fitting tip portion and the rear tubular body are connected by the telescopic jack. With the tip device installed, the telescopic jack is reduced and the press-fit tip is retracted, and the tip device is propelled into the ground through the insertion tube by the extension of the former pushing device, and the former pushing device becomes the pushing end. and time, pushing the press fit tip into the ground the telescopic jack extends, followed by press-fitting the distal end portion by reducing the stretch jack after retracting by performing reduction Moto押apparatus, a reaction force from the natural ground To prevent the insertion tube from retracting.
【００１９】本発明は、次のように作用する。The present invention operates as follows.
【００２０】次の挿入管の圧入のために元押装置を縮小
させた時、既に圧入された挿入管が後退するのを防止す
るようにしたので、挿入管の後端と元押装置との間に、
次の挿入管を配置するのに必要な間隔を確実に保持する
ことができる。従って、元押装置の伸縮ストロークを最
低限にすることができるので、装置の小型化を達成する
ことができる。更に、元押装置が小型化することによ
り、地中に掘削する発進立坑の前後長さも短くでき、掘
削費用を削減したり、用地上の制限も軽減できる。When the original pushing device is contracted for the next press-fitting of the insertion tube, the insertion tube already press-fitted is prevented from retracting, so that the rear end of the insertion tube and the original pushing device are prevented. Between,
It is possible to ensure that the space required to place the next insertion tube is maintained. Therefore, since the expansion / contraction stroke of the original pushing device can be minimized, the size of the device can be reduced. Further, the downsizing of the starting device can reduce the front-rear length of the starting shaft to be excavated in the ground, thereby reducing the excavation cost and the restriction on the ground.
【００２１】また、予期しない後退による動きの発生を
防止できるので、従来に比して作業の安全性を高めるこ
とができる。Further, since it is possible to prevent the occurrence of movement due to an unexpected backward movement, it is possible to improve the safety of work as compared with the conventional case.
【００２２】[0022]
【発明の実施の形態】以下、本発明の好適な実施の形態
を図面に基づいて説明する。BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described below with reference to the drawings.
【００２３】図１は、本発明の圧入推進工法に用いられ
る先端装置の一例を示している。図１の先端装置１１
は、前部筒体１２を有する圧入先端部１３と、前部筒体
１２の後端部内側に部分的に嵌合された後部筒体１４と
により構成されている。FIG. 1 shows an example of a tip device used in the press-fitting propulsion method of the present invention. The tip device 11 of FIG.
Is composed of a press-fitting tip portion 13 having a front tubular body 12 and a rear tubular body 14 partially fitted inside the rear end portion of the front tubular body 12.
【００２４】前部筒体１２の前端部内側には球面軸受１
５が固定され、更に該球面軸受１５の後面には取付部１
６が固定されており、該取付部１６を貫通したクランク
軸１７が前記球面軸受１５により回転可能に支持されて
いる。クランク軸１７の先端部には、偏心部１８，１９
が備えられており、外表面が先端に向かって細くなる略
円錐面８を形成する前部ロータ２０が軸受２１により偏
心部１８に回転可能に取付けられており、又、前部ロー
タ２０の後部において前記略円錐面８を形成する後部ロ
ータ２２が軸受２３により偏心部１９に回転可能に取付
けられている。前記取付部１６の後端には、前記クラン
ク軸１７を軸線２４の周りに回転させる駆動機構２５が
設けられており、駆動機構２５を作動することにより、
前記ロータ２０，２２を異なる軌跡で回転させて振動さ
せるようにしている。A spherical bearing 1 is provided inside the front end of the front cylinder 12.
5 is fixed, and a mounting portion 1 is further provided on the rear surface of the spherical bearing 15.
6 is fixed, and a crankshaft 17 penetrating the mounting portion 16 is rotatably supported by the spherical bearing 15. At the tip of the crankshaft 17, eccentric parts 18, 19
A front rotor 20 having an outer surface forming a substantially conical surface 8 that tapers toward the tip, is rotatably attached to the eccentric portion 18 by a bearing 21, and the rear portion of the front rotor 20 is also provided. In, the rear rotor 22 forming the substantially conical surface 8 is rotatably attached to the eccentric portion 19 by a bearing 23. A drive mechanism 25 for rotating the crankshaft 17 around an axis 24 is provided at the rear end of the mounting portion 16, and by operating the drive mechanism 25,
The rotors 20 and 22 are rotated and vibrated in different trajectories.
【００２５】上記した前部筒体１２の前端内側に設けた
球面軸受１５と、後部筒体１４の先端部との間は、伸縮
ジャッキ２６にて連結しており、伸縮ジャッキ２６を伸
縮することにより、後部筒体１４に対して圧入先端部１
３を前側に張出したり、後退させたりできるようにして
いる。また、先端装置７の後部筒体１４の後端には、嵌
合部９ａを介して挿入管９を接続することができ、更に
挿入管９の後端には嵌合部９ａを介して別の挿入管９を
接続できるようにしている。The spherical bearing 15 provided inside the front end of the front cylinder 12 and the tip of the rear cylinder 14 are connected by a telescopic jack 26 so that the telescopic jack 26 can be expanded and contracted. As a result, the press-fitting tip portion 1 is inserted into the rear tubular body 14.
It is designed so that 3 can be projected to the front side or retracted. Further, the insertion tube 9 can be connected to the rear end of the rear tubular body 14 of the tip device 7 via the fitting portion 9a, and the rear end of the insertion tube 9 can be separated via the fitting portion 9a. The insertion tube 9 of 1 can be connected.
【００２６】次に、図１に示した先端装置１１を用いて
本発明の圧入推進工法を実施する第１の形態について説
明する。Next, a first mode for carrying out the press-fitting propulsion method of the present invention by using the tip device 11 shown in FIG. 1 will be described.
【００２７】図２は先端装置１１の後部に既に２本の挿
入管９が接続されて地中に圧入された状態を示してお
り、この状態から３番目の挿入管９を圧入する場合につ
いて説明する。FIG. 2 shows a state in which the two insertion pipes 9 are already connected to the rear portion of the tip device 11 and press-fitted into the ground, and the case where the third insertion pipe 9 is press-fitted from this state will be described. To do.
【００２８】先ず、図２に示すように、シリンダ４を縮
小して押し板６を最後部まで後退させた状態において、
３番目の挿入管９を押し板６の前側にて２番目の挿入管
９の後端に配置する。続いて、押し板６を前進させ、３
番目の挿入管９と押し板６の前側および２番目の挿入管
９の後端を嵌合させる。その後に、図１の伸縮ジャッキ
２６を伸長させて図３に示すように、先端装置１１の圧
入先端部１３を張出させる。この圧入先端部１３の張出
時には、地盤の抵抗によって挿入管９が後方に押される
ことになるが、２番目の挿入管９の後端には既に３番目
の挿入管９が嵌合配置されているので、後方に押す力は
押し板６を介してシリンダ４に伝えられる。First, as shown in FIG. 2, in a state in which the cylinder 4 is contracted and the push plate 6 is retracted to the end,
The third insertion tube 9 is arranged on the front side of the push plate 6 at the rear end of the second insertion tube 9. Then, the push plate 6 is moved forward to 3
The second insertion tube 9 is fitted to the front side of the push plate 6 and the rear end of the second insertion tube 9. After that, the telescopic jack 26 of FIG. 1 is extended to extend the press-fitting tip portion 13 of the tip device 11 as shown in FIG. When the press-fitting tip portion 13 is extended, the insertion tube 9 is pushed backward by the resistance of the ground, but the third insertion tube 9 is already fitted and arranged at the rear end of the second insertion tube 9. Therefore, the rearward pushing force is transmitted to the cylinder 4 via the pushing plate 6.
【００２９】上記したように、圧入先端部１３を張出さ
せた状態で、図４に示すように、シリンダ４を押込み終
端（ストロークエンド）まで伸長する。すると、挿入管
一本の長さ分だけ圧入される。このとき、地中に圧入さ
れる先端装置１１の前側には、非常に高い圧力Ｐ1の高
圧力部１０が形成されている。As described above, the cylinder 4 is extended to the pushing-in end (stroke end) as shown in FIG. 4 in the state where the press-fitting tip portion 13 is extended. Then, it is press-fitted by the length of one insertion tube. At this time, a high pressure portion 10 having an extremely high pressure P 1 is formed on the front side of the tip device 11 that is press-fitted into the ground.
【００３０】続いて、図１の先端装置１１の伸縮ジャッ
キ２６を縮小して、図５に示すように圧入先端部１３を
後退させる。すると、先端装置１１の前側に作用してい
た非常に高い圧力Ｐ1の高圧力部１０が解消され、よっ
て先端装置１１を介して挿入管９を後方へ押す力がなく
なり、挿入管９の後退が生じなくなる。Subsequently, the telescopic jack 26 of the tip device 11 of FIG. 1 is contracted, and the press-fit tip portion 13 is retracted as shown in FIG. Then, the high pressure portion 10 of the extremely high pressure P 1 acting on the front side of the tip device 11 is eliminated, and thus the force pushing the insertion tube 9 rearward through the tip device 11 disappears, and the insertion tube 9 retracts. Will not occur.
【００３１】このために、図６のようにシリンダ４を縮
小して押し板６を後退させても、挿入管９の後退がない
ために、３番目の挿入管９の後端と押し板６の前面との
間に、長さＬ3の挿入管９を配置するのに充分な本来あ
るベき間隔Ｌ1を保持することが可能になる。よって、
引続き４番目の挿入管９を３番目の挿入管９の後端に嵌
合配置して、前記と同様の手順により押込みを行うこと
ができる。この操作を繰返すことにより、地中に管路を
形成する。For this reason, even if the cylinder 4 is contracted and the push plate 6 is retracted as shown in FIG. 6, the insertion tube 9 is not retracted. Therefore, the rear end of the third insertion tube 9 and the push plate 6 are not moved. It is possible to maintain a proper space L 1 between the front surface of the insertion tube 9 and the front surface of the insertion tube 9 which is sufficient for disposing the insertion tube 9 having the length L 3 . Therefore,
Subsequently, the fourth insertion tube 9 can be fitted and arranged at the rear end of the third insertion tube 9, and the pushing can be performed by the same procedure as described above. By repeating this operation, a pipeline is formed in the ground.
【００３２】次に、図１に示した先端装置１１を用いて
本発明の圧入推進工法を実施する第２の形態について説
明する。Next, a second mode for carrying out the press-fitting propulsion method of the present invention using the tip device 11 shown in FIG. 1 will be described.
【００３３】図７は先端装置１１の後部に既に２本の挿
入管９が接続されて地中に圧入された状態を示してお
り、この状態から３番目の挿入管９を圧入する場合につ
いて説明する。FIG. 7 shows a state in which two insertion pipes 9 are already connected to the rear portion of the tip device 11 and press-fitted into the ground, and a case where the third insertion pipe 9 is press-fitted from this state will be described. To do.
【００３４】先ず、図７に示すように、シリンダ４を縮
小して押し板６を最後部まで後退させた状態において、
２番目の挿入管９の後端に３番目の挿入管９を嵌合配置
する。このとき、図１の伸縮ジャッキ２６を縮小させ、
先端装置１１の圧入先端部１３は後退させておく。この
状態で、図８に示すように、シリンダ４を押込み終端
（ストロークエンド）まで伸長する。すると、挿入管９
の一本分の長さだけ圧入される。このとき、地中に圧入
される先端装置１１の前側には、非常に高い圧力Ｐ1の
高圧力部１０が形成されている。First, as shown in FIG. 7, in a state in which the cylinder 4 is contracted and the push plate 6 is retracted to the rearmost part,
The third insertion tube 9 is fitted and arranged at the rear end of the second insertion tube 9. At this time, the expansion jack 26 of FIG.
The press-fitting tip portion 13 of the tip device 11 is retracted. In this state, as shown in FIG. 8, the cylinder 4 is extended to the pushing end (stroke end). Then, the insertion tube 9
It is pressed in only for the length of one. At this time, a high pressure portion 10 having an extremely high pressure P 1 is formed on the front side of the tip device 11 that is press-fitted into the ground.
【００３５】更に、前記シリンダ４による押圧力を保持
した状態において、図９に示すように、図１の先端装置
１１の伸縮ジャッキ２６を伸長して圧入先端部１３を地
中に押込み、続いて図１０に示すように、伸縮ジャッキ
２６を縮小して圧入先端部１３を後退させる。前記伸縮
ジャッキ２６の伸長時には、先端装置１１の前側に非常
に高い圧力Ｐ1の高圧力部１０が形成されるが、次に伸
縮ジャッキ２６を縮小して圧入先端部１３を後退するの
で、先端装置１１の前側に作用していた非常に高い圧力
Ｐ1の高圧力部１０は解消され、よって先端装置１１を
介して挿入管９を後方へ押す力はなくなり、挿入管９の
後退は生じなくなる。Further, in a state in which the pressing force of the cylinder 4 is maintained, as shown in FIG. 9, the telescopic jack 26 of the tip device 11 of FIG. 1 is extended to push the press-fitting tip portion 13 into the ground. As shown in FIG. 10, the telescopic jack 26 is contracted to retract the press-fitting tip portion 13. When the telescopic jack 26 is extended, the high pressure portion 10 having a very high pressure P 1 is formed on the front side of the tip device 11, but the telescopic jack 26 is then contracted and the press-fit tip portion 13 is retracted. The high pressure part 10 of the very high pressure P 1 acting on the front side of the device 11 is eliminated, so that the force pushing the insertion tube 9 rearward through the tip device 11 is eliminated, and the retraction of the insertion tube 9 does not occur. .
【００３６】従って、図１０のようにシリンダ４を縮小
して押し板６を後退させても、３番目の挿入管９の後端
と押し板６の前面との間に、長さＬ3の挿入管９を配置
するのに充分な本来あるベき間隔Ｌ1を保持することが
可能になる。よって、続いて４番目の挿入管９を第３の
挿入管９の後端に嵌合配置して、前記と同様の手順によ
り押込みを行うことができる。この操作を繰返すことに
より、地中に管路を形成する。Therefore, even if the cylinder 4 is contracted and the push plate 6 is retracted as shown in FIG. 10, a length L 3 is provided between the rear end of the third insertion tube 9 and the front face of the push plate 6. It is possible to maintain the original spacing L 1 sufficient for disposing the insertion tube 9. Therefore, subsequently, the fourth insertion tube 9 can be fitted and arranged at the rear end of the third insertion tube 9, and the pushing can be performed by the same procedure as described above. By repeating this operation, a pipeline is formed in the ground.
【００３７】なお、上記説明では、既に２本の挿入管９
が圧入された状態から３番目の挿入管９を圧入する場合
について説明したが、最初に押込みを行う先端装置１１
の場合にも、前記図２〜図６に示した方法、或いは図７
〜図１０に示した方法と同様の方法を用いることによ
り、先端装置１１に後退を生じさせないように押込むこ
とができる。In the above description, the two insertion tubes 9 are already used.
The case where the third insertion tube 9 is press-fitted from the state in which the press-fitting is performed has been described.
In the case of, the method shown in FIGS.
By using a method similar to that shown in FIGS. 10A to 10C, the tip device 11 can be pushed in so as not to retract.
【００３８】また、上記説明では、１回のストロークで
挿入管を押込む方式について説明したが、盛替えを行っ
て２回のシリンダの伸長で挿入管を挿入する方式の場合
にも同様に実施することができる。このとき、挿入管の
後退が防止されるので、盛替え時のピンの挿脱作業を容
易確実にしかも迅速に行うことができる。Further, in the above description, the method of pushing the insertion tube with one stroke has been described, but the same method is also applied to the method of inserting the insertion tube by refilling and extending the cylinder twice. can do. At this time, since the backward movement of the insertion tube is prevented, the work of inserting and removing the pin at the time of the rearrangement can be performed easily, surely, and quickly.
【００３９】なお、本発明は図示した形態例にのみ限定
されるものではなく、先端装置は伸縮できる構造を備え
ていれば種々の構成のものを採用できること、その他本
発明の要旨を逸脱しない範囲内において種々変更を加え
得ること、等は勿論である。The present invention is not limited to the illustrated embodiment, and the tip device can have various structures as long as it has a structure capable of expanding and contracting, and other scopes not departing from the gist of the present invention. It goes without saying that various changes can be made within.
【００４０】[0040]
【発明の効果】本発明によれば、次の挿入管の圧入のた
めに元押装置を縮小させた時、既に圧入された挿入管に
対する地山からの反力を低減して挿入管が後退するのを
防止するようにしたので、挿入管の後端と元押装置との
間に、次の挿入管を配置するのに必要な間隔を確実に保
持することができる。従って、元押装置の伸縮ストロー
クを最低限にすることができるので、装置の小型化を達
成できる効果がある。更に、元押装置が小型化すること
により、地中に掘削する発進立坑の前後長さも短くで
き、掘削費用を削減したり、用地上の制限も軽減できる
という効果がある。According to the present invention, when the original pushing device is contracted for the next press-fitting of the insertion tube, the insertion tube already press-fitted is inserted .
Since the reaction force from the ground against the ground is reduced to prevent the insertion tube from retracting, it is necessary to arrange the next insertion tube between the rear end of the insertion tube and the original pushing device. The distance can be reliably maintained. Therefore, since the expansion / contraction stroke of the original pushing device can be minimized, the size of the device can be reduced. Furthermore, the downsizing of the starter shaft for excavating into the ground can be shortened due to the downsizing of the source pusher device, which has the effect of reducing excavation costs and restrictions on the ground.
【００４１】また、予期しない後退による動きの発生を
防止できるので、従来に比して作業の安全性を高められ
る効果がある。Further, since it is possible to prevent the occurrence of movement due to an unexpected backward movement, there is an effect that the safety of work can be improved as compared with the conventional case.
【図１】本発明の圧入推進工法に用いる先端装置の形態
を示す切断側面図である。FIG. 1 is a cut side view showing a form of a tip device used in a press-fitting propulsion method of the present invention.
【図２】本発明の第１の形態の作動を説明するための側
面図である。FIG. 2 is a side view for explaining the operation of the first mode of the present invention.
【図３】本発明の第１の形態の更に次の作動状態を示す
側面図である。FIG. 3 is a side view showing a further operation state of the first embodiment of the present invention.
【図４】本発明の第１の形態の更に次の作動状態を示す
側面図である。FIG. 4 is a side view showing still another operation state of the first embodiment of the present invention.
【図５】本発明の第１の形態の更に次の作動状態を示す
側面図である。FIG. 5 is a side view showing still another operation state of the first embodiment of the present invention.
【図６】本発明の第１の形態の更に次の作動状態を示す
側面図である。FIG. 6 is a side view showing still another operation state of the first embodiment of the present invention.
【図７】本発明の第２の形態の作動を説明するための側
面図である。FIG. 7 is a side view for explaining the operation of the second mode of the present invention.
【図８】本発明の第２の形態の更に次の作動状態を示す
側面図である。FIG. 8 is a side view showing still another operation state of the second embodiment of the present invention.
【図９】本発明の第２の形態の更に次の作動状態を示す
側面図である。FIG. 9 is a side view showing still another operation state of the second embodiment of the present invention.
【図１０】本発明の第２の形態の更に次の作動状態を示
す側面図である。FIG. 10 is a side view showing still another operation state of the second embodiment of the present invention.
【図１１】従来の圧入推進工法を実施する推進装置の一
例を示す側面図である。FIG. 11 is a side view showing an example of a propulsion device that implements a conventional press-fitting propulsion method.
【図１２】図１１の装置の作動を説明するための側面図
である。12 is a side view for explaining the operation of the device of FIG.
１ 元押装置 ２ 発進立坑 ９ 挿入管 １１ 先端装置 １３ 圧入先端部 １４ 後部筒体 ２６ 伸縮ジャッキ Ｂ 後退 1 original pushing device 2 start shaft 9 Insertion tube 11 Advanced equipment 13 Press-fit tip 14 Rear cylinder 26 Telescopic jack B retreat
───────────────────────────────────────────────────── フロントページの続き (72)発明者 田中 実 東京都千代田区大手町ニ丁目３番１号 日本電信電話株式会社内 (72)発明者 高梨 敏彦 東京都千代田区大手町ニ丁目３番１号 日本電信電話株式会社内 (72)発明者 日野 英則 東京都千代田区大手町ニ丁目３番１号 日本電信電話株式会社内 (56)参考文献 実開 昭50−157707（ＪＰ，Ｕ) 実開 昭51−29606（ＪＰ，Ｕ) 特公 昭52−37683（ＪＰ，Ｂ２) (58)調査した分野(Int.Cl.7，ＤＢ名) E21D 9/06 311 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Minor Tanaka 3-1, Otemachi Ni-chome, Chiyoda-ku, Tokyo Inside Nippon Telegraph and Telephone Corporation (72) Toshihiko Takanashi 3-1-1 Otemachi, Chiyoda-ku, Tokyo No. Nippon Telegraph and Telephone Corp. (72) Inventor Hidenori Hino 3-3 Otemachi Nicho, Chiyoda-ku, Tokyo Within Nippon Telegraph and Telephone Corp. (56) References Showa 50-157707 (JP, U) Actual Show 51-29606 (JP, U) JP-B 52-37683 (JP, B2) (58) Fields investigated (Int.Cl. 7 , DB name) E21D 9/06 311
Claims (2)
入管を介して先端装置を地中に推進させる圧入推進工法
であって、圧入先端部と後部筒体とを伸縮ジャッキによ
り連結した先端装置を設け、伸縮ジャッキを伸長して圧
入先端部が張出した状態の先端装置を、元押装置の伸長
により挿入管を介して地中に推進させ、元押装置が押込
み終端になった時、伸縮ジャッキを縮小して圧入先端部
を引込めた後に元押装置の縮小を行うことにより、地山
からの反力を低減して挿入管の後退を防止することを特
徴とする圧入推進工法。1. A press-fitting propulsion method in which a tip-end device is propelled into the ground through an insertion tube by a source pusher provided in a starting shaft, wherein the press-fit tip part and a rear cylinder are connected by a telescopic jack. Is installed to extend the telescopic jack and push the tip device in the state where the press-fitting tip part is extended to propel it into the ground through the insertion tube by the extension of the original pushing device, and when the original pushing device reaches the pushing end, it expands and contracts. by performing the reduction of Moto押device after retracting press-fit tip by reducing the jack, natural ground
A press-fitting propulsion method characterized by reducing the reaction force from the inside to prevent the insertion tube from retracting.
入管を介して先端装置を地中に推進させる圧入推進工法
であって、圧入先端部と後部筒体とを伸縮ジャッキによ
り連結した先端装置を設け、伸縮ジャッキを縮小して圧
入先端部が引込められた状態の先端装置を、元押装置の
伸長により挿入管を介して地中に推進させ、元押装置が
押込み終端になった時、伸縮ジャッキを伸長して圧入先
端部を地中に押込み、続いて伸縮ジャッキを縮小して圧
入先端部を引込めた後に元押装置の縮小を行うことによ
り、地山からの反力を低減して挿入管の後退を防止する
ことを特徴とする圧入推進工法。2. A press-fitting propulsion method in which a tip-end device is propelled into the ground through an insertion pipe by a source pusher provided in a starting shaft, wherein the press-fit tip end part and a rear cylinder are connected by a telescopic jack. When the end device with the retractable jack retracted and the press-fit tip retracted is propelled into the ground through the insertion tube due to extension of the former push device, when the former push device reaches the push end. Reducing the reaction force from the ground by extending the telescopic jack to push the press-fitting tip into the ground, and then shrinking the telescopic jack to retract the press-fitting tip and then reducing the original pusher. The press-fitting propulsion method is characterized by preventing the backward movement of the insertion tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000322723A JP3455509B2 (en) | 2000-10-23 | 2000-10-23 | Press-in method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000322723A JP3455509B2 (en) | 2000-10-23 | 2000-10-23 | Press-in method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002129879A JP2002129879A (en) | 2002-05-09 |
| JP3455509B2 true JP3455509B2 (en) | 2003-10-14 |
Family
ID=18800554
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000322723A Expired - Lifetime JP3455509B2 (en) | 2000-10-23 | 2000-10-23 | Press-in method |
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| Country | Link |
|---|---|
| JP (1) | JP3455509B2 (en) |
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|---|---|
| JP2002129879A (en) | 2002-05-09 |
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