JP2878180B2 - Guidance pipe for curved propulsion method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a guide pipe laid before laying a small-diameter buried pipe in the ground in a two-step curve propulsion method, and is particularly useful for long-distance curve propulsion. The present invention relates to a guide pipe for a curve propulsion method.

[0002]

2. Description of the Related Art Conventionally, a small diameter (for example, a diameter of about 300 mm to 700 mm) so that a human cannot enter a buried pipe.
As a method of laying underground pipes for sewage pipes, gas pipes, or communication cable pipes (hereinafter collectively referred to as “pipe pipes”) underground, the main shaft is pushed from the starting shaft provided at the starting point of excavation. There is a non-cutting method in which a jack is used to sequentially push an excavator and a buried pipe connected to a rear portion thereof, excavate a space up to an arrival shaft provided at an excavation end point, and lay a buried pipe.

On the other hand, in recent years, such pipes are often provided underground in cities. In this case, underground buried objects such as underground foundations in buildings and piers are avoided, and along intersections and meandering paths. There is a need to curve the ground. In addition, there is a case where it is necessary to perform accurate curve propulsion along a cloth design drawing curve depending on a laying place.

[0004]

However, when such a curve propulsion is performed by the above-described method, a large thrust for piercing underground is required, and a side reaction force becomes a load during the curve propulsion. This makes accurate curve propulsion difficult. Therefore, in the curve propulsion method, it is necessary to always measure the position of the excavator accurately while digging while correcting along the planned road, but if the buried pipe is small in diameter, bring a surveying instrument into the pipe It is not possible to measure the position of the excavator by using the method, so that it is difficult to accurately propell the excavator along the cloth design drawing curve.

Further, conventionally, since the buried pipe is connected to the rear of the excavator and propelled by the main push jack, the buried pipe can withstand a large thrust during long distance excavation or curved propulsion. It may not be possible.

As a conventional technique for laying such a small-diameter buried pipe, there is an invention described in Japanese Patent Application Laid-Open No. 58-120995. In the present invention, an intermediate jack portion composed of a plurality of jacks is provided in the middle of the buried pipe provided at the rear of the excavator, the direction of the buried pipe is bent at the intermediate jack portion, and the buried pipe is pushed by the original push jack to feed the buried pipe. Has been laid. However, in this case, the buried pipe connected to the rear end of the excavator is directly subjected to the power to propel the excavator. Curve propulsion is difficult.

Another conventional technique is disclosed in Japanese Patent Laid-Open No. 5-52.
There is an invention described in Japanese Patent Publication No. 090, in which a bendable flexible portion is provided and joined between a front portion and a rear portion of a buried pipe. Accurate curve propulsion is difficult because the buried pipe receives the thrust, and long-distance propulsion is difficult due to strength restrictions.

Further, another prior art disclosed in Japanese Patent Laid-Open No.
In the invention described in Japanese Patent Publication No. 2093, an attempt is made to perform an accurate curve propulsion method by detecting a bending angle of a buried pipe.
In the invention described in Japanese Patent No. 978, an accurate curve propulsion method is attempted by calculating the moving distance from the previously input planned trajectory data and the signal from each detection sensor and controlling the operation of the opening adjustment jack. However, even in these inventions, the buried pipe connected to the rear end of the excavator is directly subjected to the thrust of the excavator. Difficult to promote. In addition, when detecting the bending angle of a buried pipe, there are many detection points, and even if one point cannot be detected, the exact position of the excavator cannot be measured. Even when calculating the travel distance, it is difficult to measure the position of the excavator accurately because only the detection is performed at several points, and the curve propulsion method according to these inventions has low reliability.

There is an invention described in Japanese Patent Application Laid-Open No. 61-137996 as a guide tube in this type of construction method. Is provided with a plurality of pipes, and is not a guide pipe that can be used in the curve propulsion method targeted by the invention of this application.

As described above, according to the conventional technology, it is difficult to perform long-distance curve propulsion and accurate curve propulsion. Therefore, during long-distance propulsion on an intersection or meandering road, straight propulsion is performed between a plurality of shafts. At present, it is laying a pipeline similar to curve propulsion by repeating. For this reason, enormous costs are required along with prolonged construction.

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the invention according to the present application is directed to a guide pipe for a curve propulsion method in which a small-diameter curve propulsion is performed in two steps of installation of an induction pipe and installation of a buried pipe. The guide tube is formed from a front tube and a rear tube, and a middle bent portion is provided in an intermediate portion, and the middle bent portion is bendable and an outer peripheral seal portion is formed around the guide tube to prevent intrusion of muddy water and the like. An axially continuous rail is provided in the guide tube so that the survey robot can travel on the rail. Then, by running the survey robot in the axial direction of the guide pipe along the rail, the curve propulsion is performed while surveying the exact position of the excavator by a signal from the survey robot traveling at a predetermined position of the guide pipe. Can be. In addition, if the strength of the guide tube is increased, it can sufficiently withstand the thrust during long-distance curve propulsion. Further, if the front pipe and the rear pipe are connected by the forced bending means, the guide pipe can be bent accurately following the curve propulsion of the excavator.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to this application is a two-step process of laying a guide pipe by pushing a small-diameter excavator from a starting shaft with a main jack, and then laying a buried pipe in place of the guide pipe. A guide tube used in the curve propulsion method is formed from a front tube and a rear tube, and the front tube and the rear tube are connected so as to be able to bend in the radial direction to provide a middle bent portion, and an outer peripheral seal is provided around the middle bent portion. Forming a portion, a rail on which the surveying robot travels is provided on an upper portion of a surface substantially orthogonal to a bending axis in which the front tube and the rear tube bend in the radial direction in the guide tube, and the front tube is provided on the rail. A front rail continuous with the rear pipe is provided, and a front end of the front rail is fixed to the front pipe with a fixing member, and a rear end side is fixed to the rear pipe with a fixing member. Fixing by the fixing member on the rear end side so that it does not move in the width direction and the axial direction. The movement in the width direction of the rail is fixed so as to be slidable in arresting the axial direction, it is flexibly configured a portion located in the center-folding portion of the rail.

As described above, the guide tube is formed from the front tube and the rear tube, and if these are made bendable at the center bent portion, the guide tube bends following the curve propulsion of the excavator. The middle folded portion is prevented from entering muddy water and the like by a peripheral seal portion around the center bent portion. Since the surveying robot can run along the rail provided in the axial direction in the guide tube that can be bent, if the traveling distance and azimuth are detected by this surveying robot, the position of the excavator can be accurately measured. it can.

At this time, the rail is disposed on an upper portion of a surface substantially orthogonal to a bending axis where the front pipe and the rear pipe bend in the radial direction.
Therefore , the bending force acting on the rail can be substantially limited to the bending force from the lateral direction.

[0015] A plurality of pipes are provided in the axial direction of the guide pipe.
At the position of the pipe located at the mid-fold,
At the end of the pipe that was cut at a predetermined interval before and after
A large-diameter seal cylinder is provided on the inner periphery of the seal cylinder.
A pipe of a predetermined length provided in a sealing cylinder by a heavy sealing material
A bendable seal that seals around the body
If provided, the water supply pipe and the like supplied to the excavator can be bent in accordance with the bending angle of the guide pipe.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the invention according to the present application will be described below with reference to the drawings. FIG. 1 is a side sectional view showing an embodiment of a guide tube (forced type) having a telescopic cylinder as a forced bending means in the guide tube for a curved propulsion method of the invention according to the present application, and FIG. 2 is a main part of FIG. FIG. 3 is an enlarged side sectional view of FIG.
4 (a) and 4 (b) are enlarged sectional views of a seal portion of the pipe shown in FIG. 2, and FIG. 5 is an enlarged sectional view of a pipe end shown in FIG. FIG. 6 is a cross-sectional view in plan view of FIG. 2, in which the lower half is a cross-sectional view showing the upper pin side, and the upper half is a cross-sectional view showing the rail side.

[0017] As illustrated, the guide tube (coercion) P ₁ is a predetermined length of the front tube 1 is formed from the rear tube 2 which includes a further front tube 2A and the rear tube 2 in this embodiment the rear By forming the tube from the tube 2B, manufacturing efficiency is improved. An end flange f connecting the front tube 2A and the rear tube 2B.
A sealing material 2a is provided at the rear end of the rear tube 2. The division of the rear pipe 2 may be formed integrally if there is no problem in production or assembly, and may be appropriately determined according to the diameter of the excavator or the like. Further, in this embodiment, 500 mm illustrate the size of the front and rear as an induction pipe P ₁ of small diameter, such as a human can not enter.

A connecting member 3 protruding from the rear end of the front pipe 1 and a connecting member 4 protruding from the front end of the rear pipe 2 are provided at connecting portions between the front pipe 1 and the rear pipe 2. The center bending part R is formed by being flexibly connected by 5. Therefore, the front pipe 1 and the rear pipe 2 are connected to bend in the radial direction with respect to the bending axis S which is the vertical axis of the connecting pins 5 provided above and below.

An outer peripheral seal portion T is formed around the center bent portion R. The outer peripheral seal portion T is provided on the front pipe 1 projecting from the rear end of the front pipe 1 toward the rear pipe 2. A cylindrical member 6 having substantially the same diameter as the above, a seal supporting member 7 having a smaller diameter than the cylindrical member 6 protruding from the front end of the rear pipe 2 to the front pipe 1 side, and a sealing material 8 provided therebetween. The sealing material 8 is provided on the front pipe 1 side and the rear pipe 2 side with the bending axis S interposed therebetween, thereby forming a double sealing structure. By providing the sealing material 8 on the front pipe 1 side and the rear pipe 2 side with the bending axis S interposed therebetween, the same sealing effect can be obtained regardless of which direction the front pipe 1 and the rear pipe 2 bend. I can demonstrate it. In this embodiment, the outer periphery of the support member 7 is formed in a spherical shape so that the support member 7 and the cylindrical member 6 do not come into contact with each other even when bent at about 5 degrees.

The front tube 1 and the rear tube 2 of the center bent portion R are connected by a telescopic jack 9 which is a forcible bending means, and this telescopic jack 9 is connected to a bracket 9a provided on the front tube 1. Both ends are rotatably supported by a bracket 9b provided on the rear tube 2. Then, by expanding and contracting the telescopic jack 9, it is possible to forcibly bend at the center folding part R around the bending axis S.

The telescopic jack by this embodiment, the hydraulic control valve 10 for controlling the driving of the telescopic jack 9 is provided on the rear portion of the guide tube P _1, for operating the hydraulic control valve 10 electrically the induction pipe P ₁ can be bent at any angle 9. By providing the oil pressure control valve 10 to the induction pipe P _1, it is possible to perform finer bending amount control of the telescopic jack 9 with individual induction pipe P _1. It is also possible to provide a hydraulic control valve 10 electric equipment such as a power unit for driving also the induction pipe P _1.

Further, in the axial direction of the guide tube P ₁ has a plurality of pipes are provided, in this embodiment, as shown in FIG. 3,
A water supply pipe 11 for supplying water to the cutter head (left side in FIG. 1), a drain pipe 12 for discharging mud, a drain pipe 13 for discharging water from the cutter head, and an earth pressure. A lubricant injection pipe 14 for injecting lubricant into the cutter head is provided.
A bendable seal portion U is provided at a position substantially located at the middle bent portion R of each of the 13 and 14 (see FIGS. 1 and 2). 2b is a coupling hole for coupling with other guide tube P _1.

As shown in the sectional views of FIGS. 4 (a) and 4 (b), the seal portion U is formed of pipes 11, 12, 13, 14 which are cut at predetermined intervals before and after the bending axis S. A slightly large-diameter seal cylinder 15 is provided at an end portion, and a double-sided sealing material 16 provided on the inner periphery of the seal cylinder 15 seals around a pipe 17 of a predetermined length provided in the seal cylinder 15. It is configured as follows.

Further, these pipes 11, 12, 13, 1
As shown in the sectional view of FIG. 5, the ends of the front tube 1 and the rear tube 2 are fixed to the end flange f by welding or the like, and a seal member 18 for sealing around the fixed portion is provided. To seal with the other end flange f.
This configuration is the same for the other end flanges f.

[0025] Then, as shown in the sectional view of FIG. 6, the center-folding unit surveying the axial direction of the guide tube P ₁ substantially orthogonal with the upper horizontal plane and the bending axis S of the R robot V (see FIG. 3) A traveling rail 19 is provided. This rail 19
It comprises a front rail 19A continuous between the front pipe 2A of the front pipe 1 and the rear pipe 2 and a rear rail 19B having the same length as the rear pipe 2B of the rear pipe 2. The front rail 19A has a front end fixed to a front part of the front tube 1 with a fixing member 20, and a rear end side fixed to a rear part of the front tube 2A of the rear tube 2 with a fixing member 21. Are supported by support members 22 provided at predetermined intervals. The support members 22 are not provided on the bending axis S but are provided at predetermined intervals with the bending axis S interposed therebetween. The fixing of the rail 19A by the front fixing member 20 is firmly fixed so as not to move in the axial direction together with the width direction, and the fixing of the rail 19A by the support member 22 and the rear fixing member 21 suppresses the movement in the width direction. Are slidably fixed in the axial direction.

The bent portion R of the rail 19A provided between the front pipe 1 and the rear pipe 2 has a support member provided at a predetermined interval with the bending axis S interposed therebetween. It is possible to bend within the range of the elastic limit of the rail 19A between 22. The amount of displacement of the guide tube in the axial direction caused by the bending is absorbed when the rail 19A other than the portion fixed by the fixing member 20 slides in the axial direction.

Since the rail 19A is disposed above the surface substantially perpendicular to the bending axis S, the bending force acting on the rail 19 can be reduced to substantially only the bending force from the lateral direction to facilitate displacement absorption. Also, the traveling means of the survey robot V can be easily configured by a known technique using wheels or the like.
The surveying robot V may be of a suspension type or the like according to the position where the rail 19 is provided.

Furthermore, as shown in FIGS. 1 to 3, the guide tube control oil and power for housing the cables 23 for supplying to the supply and excavator control oil to the telescopic jack 9 in P ₁ cable bracket as 24 is provided on the upper portion of the guide tube P _1, the cable bracket as 24 is provided a U-shaped cross section of the plate so as upwardly to open, the tip of the induction pipe P ₁ and a rear end Is supported by a swingable support member 25 provided in the first position.

On the other hand, FIG. 7 is a side sectional view showing an embodiment of a guide tube (free type) which is not provided with a telescopic cylinder as a forcible bending means in the guide tube for curved propulsion method according to the invention of the present application. in (universal type) P _2, but not constituting a hydraulic control valve 10 for expanding and contracting the telescopic jack 9 of the telescopic jack 9 Toko in the induction pipe (coercion) P _1, other configurations are the induction pipe ( coercion) are provided with a same configuration as P _1. The same components are denoted by the same reference numerals and description thereof will be omitted.

Therefore, the guide tube (free type) P ₂ is also configured to be bendable about the bending axis S of the center bent portion R.
The survey robot V can run on a rail 19 provided in the axial direction.

The above as the configuration guide tube for curve jacking method (forced type) P ₁ and the induction pipe (universal type) P ₂ and by the two-step curve jacking method, the schematic diagram shown in FIG. 8, Based on the cross-sectional view of the bent state in the cross-sectional view of FIG. 6 shown in FIG. 9, and the cross-sectional view of the bent state of the pipes of FIGS. 4 (a) and (b) shown in FIGS. 10 (a) and 10 (b). This will be described below.

That is, the guide tube P of the invention according to this application
_In the first step of laying ₁ , the guide pipe P connected to the rear of the excavator M by the main pushing jack J provided in the starting shaft H
₁ drilled by pressing the presses the rear portion of the guide tube P ₁ at a predetermined distance connecting the following guide tube P ₁ to the rear of the guide tube P ₁ at the stage of excavation and to the original pressing jack J, then causes excavation by connecting the induction pipe P ₁ each time the excavation by a predetermined distance. At this time, since a sufficient endure intensity from the original pressing jack J in the induction pipe P ₁ itself thrust applied to the excavator M can be easily secured, to withstand sufficiently against the thrust of the long distance excavation Can be.

It is difficult to accurately propell a curve along a fabric design curve by a lateral reaction force if the excavator M is used for curve propulsion only. However, such a guide pipe is provided at the rear of the excavator M. if you ask (coercion) is bent-folding portion R stretchable jack 9 so as to connect the P ₁ along a curve promoting excavator M, guide tube P ₁ exactly along the curve promoting excavator M It can be bent and curved.

At this time, as shown in FIGS. 9 and 10,
The rail 19 is bent at the center fold R, and the pipes 11, 1
2,13,14 absorbs displacement due to the bending of the guide tube P ₁ is bent at the position of the seal cylinder 15. In addition, the sealing material 8 of the outer peripheral sealing portion T provided around the center folded portion R has its periphery compressed on the side that is bent and pressed, and its periphery extends on the other side, so that the sealing member 8 extends between itself and the cylindrical member 6. Seals muddy water etc. securely. Incidentally, the cable bracket as 24 can support 25 which is pivotably supported by the front and rear ends of the guide tube P ₁ absorbs the displacement and rocking.

[0035] In the induction pipe P ₁ that this way curve promoted, since the rails 19 of the induction pipe P ₁ which is coupled to the shaft direction is formed continuously from the starting pit H along the rails 19 the position of the guide tube P ₁ and the shield machine M by moving the surveying robot V can be accurately survey.

The surveying robot V includes a guide tube P ₁
As a device that travels in the axial direction and accurately measures its own position, for example, a moving distance detector such as a rotary encoder and an azimuth detector such as a rate gyro are equipped. When the predetermined position of the starting pit side by traveling along the rail 19 to continuously measure the position after a predetermined time at a predetermined running speed, accurate flexion and excavation position of the guide tube P ₁ on the basis of the measured data Can be measured. Then, the curved propulsion trajectory L actually excavated by the excavator M can be accurately measured based on the survey data and signal data from a unique measuring device provided in the excavator M. This way, the curved promote locus L formed by the excavator and the induction pipe P ₁ is measured accurately, it is possible to easily correct the shift between the laying plan curve.

When the guide pipe is laid by the curve propulsion method, preferably, a plurality of guide pipes (forced type) P ₁ having the telescopic jack 9 are provided at the rear of the excavator M, and the guide pipe P ₁ is dug. If the machine M is bent accurately along the curved propulsion trajectory L and is propelled in a curved manner, the excavator M and this guide pipe P ₁
Thus, a predetermined curved propulsion trajectory L is formed.

After the predetermined propulsion trajectory L is formed by the excavator M and the plurality of guide tubes (forced type) P ₁ in this manner, the guide tube (forced type) P ₁ is attached to the rear of the guide tube (forced type) P _1. Swivel type) P
_{If two} are added and propelled by the main pushing jack J, these guide tubes P ₂ can also be advanced along the curved propulsion locus L. The guide tube number of (coercion) P ₁ and the induction pipe (universal type) P _2, depending on the drilling length, for example 10
In the case of forming a conduit 0 m, 4 to 5 pieces of the guide tube to the rear of the shield machine M (the forced type) P ₁ is connected, then press based by replenishing the guide tube (universal type) P ₂ If it is pushed by a jack, curve propulsion almost along the cloth design drawing curve becomes possible. Incidentally, the number of the guide tube (coercion) P ₁ may be appropriately set according to the angle and excavator diameter of the bending, is not particularly limited.

In this manner, a plurality of guide tubes P
_1, even if the curve promote long distance by connecting P _2, rails 19 continuous in the axial direction from the starting pit H is provided on the guide tube (coercion) P ₁ and the guide tube (universal type) P ₂ Therefore, if the survey robot V is run from the starting shaft H, it is possible to continuously measure the inside of the guide pipes P ₁ and P ₂ . Accurate long-distance curve propulsion becomes possible while correcting the deviation from the planned curve.

Further, according to the guide pipes P ₁ and P ₂ of this embodiment, the water supply to the excavator M by the water supply pipe 11 and the lubricating material injection pipe 1
4 can supply the lubricating material, and the earth and sand excavated by the excavator M can be discharged by the mud pipe 12 and the water can be discharged by the drain pipe 13. I have.

[0041] Thereafter, when the shield machine M has reached the arrival pit, as a second step, the guide tube and pusher connect the buried pipe (Hume pipe) after the P _2, issues a guide tube from arrival pit, starting In the shaft, connect the buried pipes sequentially and push with the main push jack.
Can be replaced _every other, the P ₂ to buried pipe. When the buried pipe is pushed in, the conduit is formed by the guide pipe in advance, so that the buried pipe can be laid without requiring such a large force that the buried pipe cannot withstand. Therefore, it is possible to accurately lay a long-distance buried pipe that bends without cutting without opening the ground between the starting shaft and the reaching shaft. The extracted guide tubes P ₁ and P ₂ can be reused.

In the above embodiment, the guide tube (forced type) P
_Although the example using ₁ and the guide tube (free type) P ₂ has been described,
Rail 1 be only the guide tube (universal type) P ₂ consecutive
By running the surveying robot V along 9, the accurate curve propulsion trajectory L can be measured, so that long-distance curve propulsion can be performed with gentle curve propulsion.

The guide pipes P ₁ and P ₂ may be made of any material that can withstand the thrust during long-distance curve propulsion, such as metal or high-strength synthetic resin.

[0044]

The invention according to this application is implemented in the form described above, and has the following effects.

Since the guide tube having sufficient strength is constituted by the front tube and the rear tube which can be bent, the bend is made so as to follow the curve propulsion of the excavator even in the case of long-distance curve propulsion. Since the position of the excavator can always be measured by the surveying robot running on the rail in the guide pipe, it is possible to perform long-distance accurate curve propulsion.

[0046] At this time, Ri by the placing the rails on top of the substantially perpendicular surfaces and bending axis of the guide tube, since the bending forces acting on the rails can be only bending forces from substantially horizontal direction, Easy rail design.

Further, if a bendable seal portion is provided at a location substantially located at the middle bend of a plurality of pipes provided in the axial direction of the guide pipe, a water supply pipe or the like supplied to the excavator can be bent at a bending angle of the guide pipe. Can be bent in accordance with

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a guide tube (forced type) having a telescopic cylinder in a guide tube for a curved propulsion method according to the invention of the present application.

FIG. 2 is an enlarged side sectional view of a main part of FIG.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

4 (a) and 4 (b) are enlarged sectional views of a seal portion of the pipe shown in FIG. 2;

FIG. 5 is an enlarged sectional view of a pipe end shown in FIG. 2;

FIG. 6 is a cross-sectional view in plan view of FIG. 2, wherein a lower half is a cross-sectional view showing an upper pin, and an upper half is a cross-sectional view showing a rail.

FIG. 7 is a side sectional view showing a guide tube (flexible type) having no telescopic cylinder in the guide tube for a curved propulsion method according to the invention according to the present application.

FIG. 8 is a schematic view showing a method of performing curve propulsion using the guide tube for a curve propulsion method of the invention according to the present application.

9 is a sectional view showing a bent state of the sectional view in plan view shown in FIG. 6;

10 (a) and 10 (b) are cross-sectional views showing a bent state of a seal portion of the pipe shown in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Front pipe 2 ... Rear pipe 3 ... Connection member 4 ... Connection member 5 ... Connection pin 6 ... Cylindrical member 7 ... Seal support member 8 ... Seal material 9 ... Telescopic jack 10 ... Hydraulic control valve 11 ... Water supply pipe 12 ... Drainage Pipe 13 ... Drain pipe 14 ... Sliding material injection pipe 15 ... Seal cylinder 16 ... Seal material 17 ... Tube 18 ... Seal material 19 ... Rail 19a ... Front rail 19b ... Rear rail 20 ... Fixing member 21 ... Fixing member 22 ... Support member 23 ... cable 24 ... cable receiving fixture 25 ... support f ... end flanges P ₁ ... guide pipe (coercion) P ₂ ... guide pipe (universal type) R ... center-folding unit S ... bending axis T ... seal portion U: seal part V: survey robot M: excavator L: curved propulsion trajectory H: starting shaft J: main push jack

Continued on the front page (73) Patent holder 000160784 Kubota Corporation 1-8-8 Shinkawa, Chuo-ku, Tokyo (73) Patent holder 592089010 Daito Kogyo Co., Ltd. 1-36-6 Kameido, Koto-ku, Tokyo (73 ) Patent holder 592009133 Minamino Construction Co., Ltd. Shin-Umeda Building, 2-2-1 Shibata, Kita-ku, Osaka-shi, Osaka (73) Patentee 000154565 Fukuda-gumi Co., Ltd. 3-10 Ichibanoridoricho, Niigata City, Niigata Prefecture (73) Patent holder 591214804 Matsumura Gumi Co., Ltd. 1-10-20 Higashitenma, Kita-ku, Osaka-shi, Osaka (73) Patent holder 594082604 Magarashi Construction Co., Ltd. 1-13-43 Hikomicho, Kanazawa-shi, Ishikawa (73) Patent Authority 594186555 Mabuchi Construction Co., Ltd. 2-26 Hananogi-cho, Minami-ku, Yokohama-shi, Kanagawa Prefecture (73) Patent holder 000176785 Mitsubishi Construction Co., Ltd. 3-6-1 Nihonbashi Honcho, Chuo-ku, Tokyo (73) Patent holder 591091205 Muramoto Construction Co., Ltd. 1 (73) Patentee 000146928 Morimoto Gumi Company 4-11, Yuyooka-cho, Tennoji-ku, Osaka-shi, Osaka (73) Patent owner 000000974 Kawasaki Heavy Industries, Ltd. 2-17-3, Shibuya, Shibuya-ku, Japan Aoki Construction Co., Ltd. (72) Inventor Kimura Nobuhiro 3-24-1, Otsukacho, Takatsuki City, Osaka Prefecture Co., Ltd. Asanuma Gumi Co., Ltd. (72) Inventor Hayao Noami Nishinomiya, Hyogo Prefecture 12-20 Ikedacho Arai Gumi Co., Ltd. (72) Yoshikatsu Takegaki 1-11-18 Sannichi, Minato-ku, Osaka City, Osaka Prefecture Inside Okumura Gumi Civil Engineering Co., Ltd. 298-18 Nitta (72) Inventor Toshinori Kato 2-18-7-406, Saimachi, Mihama-ku, Chiba-shi, Chiba-shi (72) Inventor Mamoru 2-2-1 Shibata, Kita-ku, Osaka-shi, Osaka Shin-Umeda Building Minami Construction Co., Ltd. (72) Inventor Kazuyuki Igarashi 3-10, Ichibanoridoricho, Niigata City, Niigata Prefecture Fukuda Gumi Co., Ltd. (72) Inventor Koji Kawashima Osaka Prefecture (72) Inventor Katsunobu Takeuchi 1-13-43 Hikomicho, Kanazawa-shi, Ishikawa Pref.Shin Pattern Construction Co., Ltd. (72) Inventor Koji Katano Machida, Tokyo 1-10-7 Ogawa (72) Inventor Hiroki Takahashi 3-3-6 Nihonbashi Honcho, Chuo-ku, Tokyo Inside Mitsubishi Construction Corporation (72) Inventor Kinya Morioka 1-5-5 Shitennoji, Tennoji-ku, Osaka, Osaka No. 43 Inside Muramoto Construction Co., Ltd. No. 3 Kawasaki Heavy Industries, Ltd. Kobe Head Office Hei 5-79288 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) E21D 9/06 311

Claims (2)

(57) [Claims] 1. A guide pipe used in a two-step curve propulsion method in which a small-diameter excavator is pushed from a starting shaft by a main push jack to lay a guide pipe, and then a buried pipe is laid instead of the guide pipe. The guide tube is formed of a front tube and a rear tube, and the front tube and the rear tube are connected so as to be able to bend in the radial direction to provide a middle fold portion, and an outer peripheral seal portion is provided around the middle fold portion. A rail on which a surveying robot travels is provided on an upper surface of a plane substantially orthogonal to a bending axis in which the front pipe and the rear pipe bend in the radial direction in the guide pipe, and the front pipe and the rear pipe are provided on the rail. Between the front rail and the front rail, the front end of the front rail is fixed to the front tube with a fixing member, and the rear end side is fixed to the rear tube with a fixing member, and fixed by the fixing member at the front end To prevent it from moving in the axial direction as well as in the width direction. The width direction of the movement is fixed so as to be slidable in arresting the axial direction, the curve jacking method for inducing tube, characterized in that the flexibly configured a portion located in the center-folding portion of the rail. 2. A plurality of pipes are provided in an axial direction of a guide pipe.
At the position of the pipe located at the mid-fold,
Slightly larger diameter at the end of the pipe which was cut at a predetermined interval later
And a double seal provided on the inner periphery of the seal cylinder.
Around the pipe of a predetermined length provided in the seal cylinder
A bendable seal is provided to seal the enclosure
The guidance for a curve propulsion method according to claim 1, wherein
tube.