JPH09279989A - Guide pipe for curve jacking method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To measure the accurate position of a drilling machine, even when an embedded pipe has insufficient strength, and place the embedded pipe with long-distance curve advancing on a crossing or snaking road in a technique of advancing a small-bore drilling machine with an initially pushing jack. SOLUTION: As a guide pipe for a curve jacking method in two curve advancing steps of placing the guide pipe and placing an embedded pipe, a guide pipe P1 is formed with a front pipe 1 and a rear pipe 2 and a broken portion R provided at the middle, the front pipe 1 and the rear pipe 2 being connected together via an expandable jack 9 and the broken portion R being freely bent. An outer periphery seal portion T is provided on the periphery to prevent the entry of muddy water therein and a rail 19 is provided in the guide pipe P1 in the axial direction for a measuring robot to run. The measuring robot runs along the rail 19 in the axial direction of the guide pipe P1, so that a signal from the measuring robot is used to perform curve advancing while measuring the accurate position of a drilling machine.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Conventionally, a small diameter (for example, a diameter of about 300 mm to 700 mm) that a person cannot enter the buried pipe.
As a construction method for laying underground pipes for sewage pipes, gas pipes, or communication cable pipes (collectively, “pipes” below) in the ground, the starting shaft provided at the starting point of the excavation There is a non-excavation method in which an excavator and a buried pipe connected to the rear part of the machine are sequentially pushed by a jack, and the buried pipe is laid by excavating up to the reaching shaft provided at the excavation end point.

On the other hand, in recent years, such pipes are often installed underground in cities, and in this case, underground buried objects such as underground foundations in buildings and bridge piers are avoided, and along conduits and meandering paths. There is a need for curving through the ground. In addition, depending on the location of installation, it may be necessary to perform accurate curve propulsion along the cloth design image curve.

[0004]

However, when such curve propulsion is performed by the above-mentioned method, a large thrust force is required to push through the ground, and the lateral reaction force becomes a load during curve propulsion. Therefore, accurate curve propulsion becomes difficult. Therefore, in the curve propulsion method, it is necessary to constantly measure the position of the excavator while making corrections along the planned road, but when the buried pipe has a small diameter, bring a surveying instrument into the pipe. Since it is not possible to measure the position of the machine, it is difficult to accurately propel the machine along the cloth design curve.

In addition, conventionally, since the buried pipe is connected to the rear portion of the excavator and is propelled by the original push jack, the buried pipe can withstand the large thrust during long-distance excavation or curved propulsion in terms of strength. Sometimes you can't.

As a conventional technique for laying such a small-diameter buried pipe, there is an invention described in JP-A-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, and the direction of the buried pipe is bent by this intermediate jack portion and pushed by the original push jack to push the buried pipe. I'm laying. However, in this case, the buried pipe connected to the rear end of the excavator directly receives the force for propelling the excavator. Curve promotion is difficult.

As another conventional technique, Japanese Patent Laid-Open No. 5-52
There is an invention described in Japanese Patent No. 090, and in this invention, a flexible portion which can be bent is provided and joined between a front portion and a rear portion of the buried pipe. Since the buried pipe receives thrust, it is difficult to perform accurate curve propulsion and it is also difficult to prolong the long distance due to strength restrictions.

Further, another prior art is Japanese Patent Laid-Open No. 5-5.
In the invention described in Japanese Patent No. 2093, an attempt is made to perform an accurate curve propulsion method by detecting the bending angle of the buried pipe.
In the invention described in Japanese Patent No. 978, an accurate curve propulsion method is attempted by calculating a moving distance from preliminarily input planned trajectory data and a signal from each detection sensor to control the operation of the opening adjustment jack. However, even in these inventions, the buried pipe connected to the rear end of the excavator directly receives the thrust of the excavator. It is difficult to promote. Moreover, when detecting the bending angle of the buried pipe, there are many detection points, and even if one point cannot be detected, it is not possible to measure the exact position of the machine, and the signals of each detection sensor are used. Even when the moving distance is calculated, it is difficult to accurately measure the position of the excavator because the detection is performed at only a few points, and the curve propulsion method according to these inventions has low reliability.

There is an invention described in Japanese Unexamined Patent Publication No. 61-137996 as a guide tube in this type of construction method. In this invention, both open ends are watertightly closed by plates, and the space between the plates is A plurality of pipes are provided in the guide tube, and it is not a guide tube that can be used in the curved propulsion method targeted by the invention of this application.

As described above, according to the conventional technique, it is difficult to perform long-distance curve propulsion and precise curve propulsion. Therefore, during long-distance propulsion on an intersection or a meandering road, straight-line propulsion is required between a plurality of vertical shafts. The current situation is to lay a pipeline that is similar to curved propulsion by repeating it. Therefore, the construction work will be prolonged and enormous cost will be required.

[0011]

In order to solve the above problems, therefore, the invention according to this application is directed to a guide pipe for a curved propulsion method in which a small-diameter curve propulsion is carried out in two steps: installation of a guide pipe and installation of a buried pipe. As a guide tube, a guide tube is formed from a front tube and a rear tube, a middle fold portion is provided in the middle portion, the middle fold portion can be bent, and an outer peripheral seal portion is formed around the middle fold portion to prevent intrusion of muddy water or the like. A rail continuous in the axial direction is provided in the guide tube so that the surveying robot can travel on the rail. Then, by running the surveying robot along the rail in the axial direction of the guide pipe, the curve propulsion is performed while the accurate position of the excavator is measured by the signal from the surveying robot traveling at the predetermined position of the guide pipe. You can Further, if the strength of the guide tube is increased, it is possible to sufficiently withstand the thrust force during long-distance curve propulsion. Further, if the front pipe and the rear pipe are connected by the forcible bending means, the guide pipe can be bent accurately following the curve propulsion of the excavator.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to this application is a two-step process in which a small-diameter excavator is fed from a starting shaft by a source push jack to lay an induction pipe, and then an embedded pipe is laid in place of the induction pipe. A guide pipe used in the curved propulsion method is formed from a front pipe and a rear pipe, and the front pipe and the rear pipe are connected to each other so as to be bendable in a radial direction to provide a center folding portion, and an outer peripheral seal is provided around the center folding portion. And a rail on which the surveying robot travels in the axial direction in the guide tube is formed, and a portion of the rail located at the center-folded portion is bendable.

Thus, if the guide tube is formed of the front tube and the rear tube, and these can be bent at the center folding portion, the guide tube bends following the curve propulsion of the excavator. The periphery of the middle folded portion is prevented from entering by muddy water and the like by the outer peripheral seal portion. Since the surveying robot can be run along the rails provided in the bendable guide tube in the axial direction, it is possible to accurately measure the position of the excavator if the surveying robot detects the distance traveled and the direction. it can.

If the front tube and the rear tube of the middle folding portion are connected by the forcible bending means so that the middle folding portion can be forcibly bent, the front tube and the rear tube can be connected. It can be bent at an angle that follows the curve propulsion of the excavator.

Further, by disposing the rail above the surface of the front tube and the rear tube that is substantially orthogonal to the bending axis that bends in the radial direction, the bending force acting on the rail can be changed substantially from the lateral direction. Can only be.

Further, if a plurality of pipes are provided in the axial direction of the guide pipe and a bendable seal portion is provided at a position of the pipe located at the center-folded portion, a water supply pipe or the like for supplying to the excavator can be provided. Can be bent according to the bending angle of.

Further, the outer peripheral seal portion around the center folding portion has a double seal structure in which a sealing material is provided on the front tube side and the rear tube side with the bending shaft interposed therebetween, whereby a front tube and a rear tube are provided. A reliable sealing function can be exhibited regardless of which direction the and are bent.

Furthermore, if the hydraulic control valve for the forcible bending means is provided in the guide tube, each guide tube has a structure for controlling its own forcible bending means. Fine bending control is possible.

[0019]

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 (compulsory type) having a telescopic cylinder as a forced bending means in the guide tube for curved propulsion method of the invention according to this application, and FIG. 2 is a main part of FIG. FIG. 2 is an enlarged side sectional view of FIG.
4A, 4B are enlarged cross-sectional views of the sealing portion of the pipe shown in FIG. 2, and FIG. 5 is an enlarged cross-sectional view of the pipe end shown in FIG. FIG. 6 is a cross-sectional view in plan view of FIG. 2, in which the lower half shows the upper pin side and the upper half shows the rail side.

As shown in the figure, the guide tube (compulsory type) P ₁ is composed of a front tube 1 and a rear tube 2 each having a predetermined length. In this embodiment, the rear tube 2 is further divided into a front tube 2A and a rear tube. By forming the tube 2B, the manufacturing efficiency is improved. An end flange f that connects the front pipe 2A and the rear pipe 2B
A sealing material 2a is provided at the rear end of the rear tube 2. The divided formation of the rear pipe 2 may be integrally formed unless there is a problem in manufacturing or assembling, and may be appropriately determined according to the diameter of the excavator or the like. In addition, in this embodiment, a diameter of about 500 mm is illustrated as the guide pipe P ₁ having a small diameter that cannot be entered by a human.

At the connecting portion between the front pipe 1 and the rear pipe 2, 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 connected pins. The center folded portion R is formed by being flexibly connected by 5. Therefore, the front pipe 1 and the rear pipe 2 are connected to each other so as to be bendable in the radial direction with respect to the bending axis S which is the vertical axis of the connecting pin 5 provided above and below.

An outer peripheral seal portion T is formed around the center-folded portion R, and the outer peripheral seal portion T projects from the rear end of the front pipe 1 toward the rear pipe 2 side. With a cylindrical member 6 having a diameter substantially the same as that of the cylindrical member 6, a seal supporting member 7 having a diameter smaller than that of the cylindrical member 6 protruding from the front end of the rear pipe 2 to the front pipe 1 side, and a seal member 8 provided therebetween. The seal member 8 is provided on each of the front pipe 1 side and the rear pipe 2 side with the bending axis S interposed therebetween to form a double seal structure. By providing the sealing material 8 on the front tube 1 side and the rear tube 2 side with the bending axis S sandwiched in this way, the same sealing effect can be obtained regardless of which direction the front tube 1 and the rear tube 2 are bent. I am trying to 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-folded portion R are connected by a telescopic jack 9 which is a forcible bending means. The telescopic jack 9 and a bracket 9a provided on the front tube 1 are connected to each other. Both ends are rotatably supported by a bracket 9b provided on the rear tube 2. Then, by expanding and contracting the elastic jack 9, it is possible to forcibly bend the center folding portion R around the bending axis S.

In this embodiment, a hydraulic control valve 10 for driving and controlling the expansion / contraction jack 9 is provided in the rear portion of the guide pipe P ₁ , and the expansion / contraction jack is operated by electrically operating the hydraulic control valve 10. The guide tube P ₁ can be bent at 9 at an arbitrary angle. By providing the hydraulic control valve 10 in the guide pipe P ₁ , the bending amount of the telescopic jack 9 can be finely controlled by each guide pipe P ₁ . It should be noted that electric parts such as a power supply section for driving the hydraulic control valve 10 may be provided in the guide tube P ₁ .

A plurality of pipes are provided in the axial direction of the guide pipe P ₁ , and in this embodiment, as shown in FIG.
A water supply pipe 11 for supplying water to the cutter head (left side in FIG. 1), a mud discharge pipe 12 for discharging mud, a drain pipe 13 for discharging water from the cutter head, and earth pressure A lubricant injection pipe 14 for injecting lubricant into the cutter head is provided, and these pipes 11, 12,
A bendable seal portion U is provided at a position substantially located in the center-folded portion R of 13 and 14 (see FIGS. 1 and 2). Reference numeral 2b is a coupling hole for coupling with another guide tube P ₁ .

As shown in the cross-sectional views of FIGS. 4 (a) and 4 (b), the seal portion U is provided for the pipes 11, 12, 13, 14 which are cut at a predetermined distance in front of and behind the bending axis S. A slightly large-diameter seal cylinder 15 is provided at the end portion, and a double sealing material 16 provided on the inner circumference of the seal cylinder 15 seals the circumference of a tubular body 17 of a predetermined length provided in the seal cylinder 15. Is configured.

Further, these pipes 11, 12, 13, 1
The end portions of the front pipe 1 and the rear pipe 2 of No. 4 are fixed to the end flange f by welding or the like, as shown in the cross-sectional view of FIG. 5, and a seal member 18 that seals around the fixed portion is used. To seal with the other end flange f.
Note that this configuration is the same for the other end flanges f.

Then, as shown in the cross-sectional view of FIG. 6, the surveying robot V (see FIG. 3) moves axially in the guide pipe P ₁ at the upper part of the horizontal plane which is substantially orthogonal to the bending axis S of the center folding portion R. A rail 19 for traveling is provided. This rail 19
It comprises a front rail 19A that is continuous between the front pipe 1 and the front pipe 2A of 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 part of the front rail 19A is fixed to the front part of the front pipe 1 with a fixing member 20, and the rear end part is fixed to the rear part of the front pipe 2A of the rear pipe 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 width direction and the axial direction, and the fixing of the rail 19A by the support member 22 and the rear fixing member 21 inhibits the movement in the width direction. Is fixed so that it can slide in the axial direction.

The portion of the rail 19A thus provided, which is located at the center-folded portion R, bends between the front tube 1 and the rear tube 2, and when the bending tube S is bent, the supporting members are provided at predetermined intervals. 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 bending is absorbed by sliding the rail 19A in the axial direction other than the position fixed by the fixing member 20.

Since the rail 19A is disposed on the upper surface of the rail substantially orthogonal to the bending axis S, the bending force acting on the rail 19 can be absorbed only by bending force from the lateral direction. Further, the traveling means of the surveying robot V can be easily configured by a known technique using wheels or the like.
The surveying robot V may be a hanging type or the like depending on the position of the rail 19.

Further, as shown in FIGS. 1 to 3, a cable 23 for supplying the control oil to the telescopic jack 9 in the guide pipe P ₁ and the control oil and the power to the excavator is housed. 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 It is supported by a swingable support tool 25 provided on the.

On the other hand, FIG. 7 is a side sectional view showing an embodiment of a guide tube for a curved propulsion method of the invention according to the present application (free type) which does not include a telescopic cylinder as a forced bending means. In the (flexible type) P ₂ , there is no configuration relating to the expansion / contraction jack 9 and the hydraulic control valve 10 for expanding / contracting the expansion / contraction jack 9 in the induction pipe (forced type) P _1, but other configurations include the induction pipe ( (Forced type) P ₁ has the same configuration. The same components are designated by the same reference numerals and the description thereof will be omitted.

Therefore, this guide tube (free type) P ₂ is also configured to be bendable around the bending axis S of the center folding portion R,
The surveying robot V is configured to be able to travel on a rail 19 provided in the axial direction.

FIG. 8 is a schematic diagram showing a two-step curve propulsion method using the guide tube (forced type) P ₁ and the guide tube (free type) P ₂ for the curve propulsion method constructed as described above. Based on the sectional view of the bent state in the sectional view of FIG. 6 shown in FIG. 9 and the sectional view of the bent pipes of FIGS. 4 (a) and (b) shown in FIGS. 10 (a) and (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 part of the excavator M by the push 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 , Every time a predetermined distance is dug, the guide pipe P ₁ is connected and dug. At this time, since it is possible to easily secure a strength that can sufficiently withstand the thrust applied to the excavator M from the source pushing jack J on the guide pipe P ₁ itself, it is also possible to sufficiently withstand the thrust during long-distance excavation. You can

Further, it is difficult to accurately propel a curve along the cloth design image curve due to the side reaction force if the curve is propelled only by the excavator M, but such a guide pipe is provided at the rear part of the excavator M. By connecting the (forced type) P ₁ and bending the center-folded portion R with the telescopic jack 9 so as to follow the curved propulsion of the excavator M, the guide pipe P ₁ can be accurately guided along the curved propulsion of the excavator M. Can be bent and curved.

At this time, as shown in FIGS. 9 and 10,
The rail 19 is bent at the center folded portion R, and the pipes 11, 1
Reference numerals 2, 13 and 14 bend at the position of the seal tube 15 to absorb the displacement caused by the bending of the guide tube P ₁ . In addition, the sealing material 8 of the outer peripheral seal portion T provided around the center folding portion R is compressed on the side that is bent and pressed, and extends on the other side so that the sealing material 8 and the cylindrical member 6 are formed. It securely seals muddy water. The cable receiving member 24 is capable of absorbing a displacement by swinging a supporting member 25 that swingably supports the front and rear ends of the guide tube P ₁ .

Since the rail 19 in the guide pipe P ₁ connected in the axial direction is continuously formed in the guide pipe P ₁ that is curvedly propelled in this way, the rail 19 from the start shaft H is moved along the rail 19. By moving the surveying robot V, the positions of the guide pipe P ₁ and the excavator M can be accurately measured.

The surveying robot V includes a guide tube P₁
A device that travels axially inside to measure its position accurately
For example, the moving distance detection of a rotary encoder, etc.
Equipped with an azimuth detector such as a transmitter and rate gyro
The survey robot V from the predetermined position on the starting shaft side.
The vehicle at a predetermined traveling speed by traveling along the wheel 19.
If you continuously measure the position after the time,
Guide tube P based on ₁Accurately bend and dig position
Can be surveyed. And this survey data and excavation
Based on the signal data from the unique measuring instrument installed in machine M
Therefore, the curved propulsion locus L actually excavated by the machine M is accurately measured.
Can be measured. In this way the machine and induction
Pipe P₁Accurately measure the curved propulsion locus L formed by
If this happens, it is easy to correct the deviation from the cloth design drawing curve.
Can be.

When the guide pipe is laid by the curved propulsion method, preferably, a plurality of guide pipes (compulsory type) P ₁ having the expansion jack 9 are provided at the rear part of the excavator M and the guide pipe P ₁ is excavated. If it is bent accurately along the curved trajectory L of the machine M and is curved, the machine M and this guide pipe P ₁
A predetermined curve propulsion locus L is formed by and.

[0041] After forming a predetermined curved promote locus L in this way the shield machine M and a plurality of guide tube of the (forced type) P ₁ is the guide tube guide tube to the rear of (coercion) P ₁ ( Flexible type) P
_{If 2} is added and propelled by the original push jack J, these guide tubes P ₂ can also be advanced along the curved propulsion locus L. The number of the guide pipes (forced type) P ₁ and the guide pipes (free type) P ₂ depends on the excavation length, but is, for example, 10
In the case of forming a 0 m pipeline, 4 to 5 guide pipes (forced type) P ₁ are connected to the rear of the excavator M, and then the guide pipes (universal type) P ₂ are added to push them forward. By pushing with a jack, it is possible to carry out curve propulsion almost along the cloth design curve. The number of the guide tubes (forced type) P ₁ may be appropriately set according to the bending angle and the excavator diameter, and is not particularly limited.

In this way, the excavator M is provided with a plurality of guide pipes P.
_{Even if 1} and P ₂ are connected to perform long-distance curve propulsion, the guide tube (forced type) P ₁ and the guide tube (free type) P ₂ are provided with rails 19 continuous from the starting shaft H in the axial direction. Therefore, if the surveying 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 , and the actual curve propulsion locus L and laying are installed based on this data. Accurate long-distance curve propulsion is 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 feed pipe 11 to the excavator M and the lubricant injection pipe 1 are used.
4, it is possible to supply the lubricant, 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. There is.

After that, when the machine M reaches the reaching shaft, as a second step, a buried pipe (fume pipe) is connected behind the guiding pipe P ₂ and pushed, and the guiding pipe is taken out from the reaching shaft and started. In the vertical shaft, connect buried pipes sequentially and push with the original push jack, and when all the guiding pipes are taken out from the reaching vertical shaft, the guiding pipe P
It is possible to replace ₁ and P ₂ with a buried pipe. When the buried pipe is pushed, since the conduit is previously formed by the guide pipe, the buried pipe can be laid without requiring a large force that the buried pipe cannot withstand. Therefore, it is possible to accurately lay a long-distance buried pipe that bends without opening the ground between the starting shaft and the reaching shaft without cutting the ground. The extracted guide tubes P ₁ and P ₂ can be reused.

In the above embodiment, the guide tube (forced type) P
An example using ₁ and a guide tube (free type) P ₂ has been described.
Rail 1 that is continuous even if only induction pipe (universal type) P ₂ is used
Since the accurate curve propulsion locus L can be measured by causing the surveying robot V to travel along the line 9, it is possible to perform long-distance curve propulsion as long as it is gentle curve propulsion.

The material of the guide tubes P ₁ and P ₂ may be any material as long as it can withstand the thrust when propelling the long-distance curve, and may be metal or high-strength synthetic resin.

[0047]

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

Since the bendable guide tube is composed of the front tube and the rear tube having a sufficient strength, the curve tube is curved so as to follow the curve curve of the excavator even in the long-distance curve propulsion. Since the position of the excavator can always be measured by the surveying robot that travels on the rail in the guide pipe, it is possible to perform accurate long-distance curve propulsion.

Further, by forcibly bending between the front pipe and the rear pipe by the forcible bending means, the guide pipe can be forcibly bent at an angle along the curve propulsion of the excavator and propelled. Therefore, the guide pipe can be easily followed by the curve propulsion of the excavator.

Further, by disposing the rail on the upper part of the plane substantially orthogonal to the bending axis of the guide tube, the bending force acting on the rail can be made only from the lateral direction, so that the rail can be designed. You can easily.

Further, if a bendable seal portion is provided at a position substantially in the middle of a plurality of pipes provided in the axial direction of the guide pipe, a water supply pipe or the like to be fed to the excavator can be bent at the bend angle of the guide pipe. It becomes possible to bend it according to.

Further, if the seal portion around the center folding portion has a double seal structure, no matter how the front pipe and the rear pipe are bent, a reliable sealing function is exerted and intrusion of muddy water is facilitated. Can be prevented.

Furthermore, if a hydraulic control valve for controlling its own forcible bending means is provided in each guiding tube, each guiding tube equipped with the forcible bending means is bent along the curved propulsion of the excavator. It becomes possible to perform fine curve propulsion control.

[Brief description of drawings]

FIG. 1 is a side cross-sectional view showing a guide tube (forced type) including a telescopic cylinder for a curve propulsion method guide tube according to the invention of this 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;

4A and 4B are enlarged cross-sectional views of a seal portion of the pipe shown in FIG.

5 is an enlarged cross-sectional view of the pipe end portion shown in FIG.

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

FIG. 7 is a side sectional view showing a guide tube for a curved propulsion method according to the invention of this application, which does not include a telescopic cylinder (a flexible type).

FIG. 8 is a schematic view showing a method of curving with a guide tube for curving propulsion method according to the invention of this application.

9 is a cross-sectional view showing a bent state of the cross-sectional view in the plan view shown in FIG.

10 (a) and 10 (b) are sectional views showing a bent state of the 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 mud Pipe 13 ... Drain pipe 14 ... Lubricant injection pipe 15 ... Sealing cylinder 16 ... Sealing material 17 ... Pipe body 18 ... Sealing 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 ... Sealing part V ... Surveying robot M ... Excavator L ... Curved propulsion locus H ... Start vertical shaft J ... Original push jack

 ─────────────────────────────────────────────────── ─── Continuation of the front page (71) Applicant 000160784 Kubota Construction Co., Ltd. 1-8-8 Shinkawa, Chuo-ku, Tokyo (71) Applicant 592089010 1-38-6 Kameido, Koto-ku, Tokyo 71) Applicant 592009133 Nanno Construction Co., Ltd. 2-2-1 Shibata, Kita-ku, Osaka-shi, Shin-Umeda Building (71) Applicant 000154565 Fukuda-Gumi Co., Ltd. 3-10, Ichibanhori-dori-cho, Niigata City, Niigata Prefecture (71) Application People 591214804 Matsumura Gumi Co., Ltd. 1-10-20 Higashitenma, Kita-ku, Osaka-shi, Osaka (71) Applicant 594082604 Maji Construction Co., Ltd. 1-34-143 Hikosan-cho, Kanazawa-shi, Ishikawa (71) Applicant 594186555 Mabuchi Construction Co., Ltd. 2-26 Hananogi-cho, Minami-ku, Yokohama-shi, Kanagawa (71) Applicant 000176785 Mitsubishi Construction Co., Ltd. 3-3-6 Nihonbashi-honcho, Chuo-ku, Tokyo (7) 1) Applicant 591091205 Muramoto Construction Co., Ltd. 1-11 Hirao, Kyoryo-cho, Kitakatsuragi-gun, Nara (71) Applicant 000146928 Morimoto Gumi Co., Ltd. 4-11 Yuhigaoka-cho, Tennoji-ku, Osaka-shi, Osaka (71) Applicant 000000974 Kawasaki Heavy Industries, Ltd. 3-1-1 Higashikawasaki-cho, Chuo-ku, Kobe-shi, Hyogo Prefecture (72) Inventor Ari Nozawa 2-17-3 Shibuya, Shibuya-ku, Tokyo Aoki Construction Co., Ltd. (72) Inventor Norihiro Kimura Osaka 3-24-1, Otsuka-cho, Takatsuki-shi, prefecture (72) Inventor Hayami Noami 12-20 Ikeda-cho, Nishinomiya-shi, Hyogo Arai group (72) Inventor Yoshikatsu Takegaki Osaka-shi, Osaka (11) Okumura-gumi Civil Engineering Co., Ltd. (72) Inventor Riki Sato 298-18 Ehara Shinden, Sakura City, Chiba Prefecture (72) Inventor Tokunori Kato Saiwaicho, Mihama-ku, Chiba Prefecture 2-18-7-406 (72) Inventor Mamoru Yamana 2-2-1 Shibata, Kita-ku, Osaka-shi, Osaka Shin-Umeda Building Minamino Construction Co., Ltd. (72) Invention Kazuyuki Igarashi 3-3, Ichibanhori-dori-cho, Niigata-shi, Niigata Stock Company Fukuda Gumi (72) Inventor Kawaji Jinji 3-8 Shinobiodai 3chome 203, Sakai-shi, Osaka (72) Inventor Katsunobu Takeuchi 1-13-43, Hikosan-cho, Kanazawa, Ishikawa Prefecture Shinara Construction Co., Ltd. (72) Inventor, Koji Katano 1-10-7 Ogawa, Machida, Tokyo (72) Inventor Hiroki Takahashi 3-chome, Nihonbashihoncho, Chuo-ku, Tokyo No. 3-6 Mitsubishi Construction Co., Ltd. (72) Inventor Kinya Morioka 1-543 Shitennoji, Tennoji-ku, Osaka-shi, Osaka Prefecture Muramoto Construction Co., Ltd. (72) Inventor Takahiro Yamazaki Tennoji-ku, Osaka-shi, Osaka Yuhigaoka-cho 4-11 Morimoto Gumi Co., Ltd. (72) Inventor Takashi Mori 1-3-1 Higashikawasaki-cho, Chuo-ku, Kobe-shi, Hyogo Kawasaki Heavy Industries, Ltd. Kobe Head Office

Claims (6)

[Claims] 1. A guide pipe for use in a two-step curved propulsion method, in which a small-diameter excavator is pushed from a starting shaft by a push-pull jack to lay a guide pipe and then an embedded pipe is laid in place of the guide pipe. The guide tube is formed of a front tube and a rear tube, the front tube and the rear tube are connected to each other so as to be bendable in a radial direction to provide a center-folded portion, and an outer peripheral seal portion is provided around the center-folded portion. A guide tube for a curved propulsion method, characterized in that the guide tube is formed and provided with a rail on which the surveying robot runs in the axial direction, and a portion of the rail located at the center-folded portion is bendable. 2. A structure in which the front tube and the rear tube of the center-folded portion are connected by forcible bending means so that the center-folded portion can be forcibly bent. Induction pipe for the curved propulsion method described. 3. The curvilinear propulsion according to claim 1, wherein the rail is disposed above a surface of the front pipe and the rear pipe that is substantially orthogonal to a bending axis that bends in the radial direction. Induction pipe for construction method. 4. A plurality of pipes are provided in an axial direction of the guide pipe, and a bendable seal portion is provided at a position of the pipe located at the center-folded portion. The guide tube for the curved propulsion method according to item 1. 5. The double-sealed structure in which the outer peripheral seal portion around the center-folded portion is provided with a sealing material on the front tube side and the rear tube side with the bending shaft interposed therebetween. The guide tube for the curved propulsion method according to any one of 4 to 4. 6. The guide tube for curved propulsion method according to claim 2, wherein a hydraulic control valve for the forced bending means is provided in the guide tube.