JPH089951B2 - Method and device for burial of buried pipe - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method and apparatus for propulsion and embedding a buried pipe,
Specifically, in the construction of buried pipes such as vinyl chloride pipes in the construction of sewers, etc., when burying a buried hole in the ground while excavating the buried pipe, the buried pipe is sequentially pushed into the buried hole and buried, The present invention relates to an apparatus used for implementation.

[Conventional technology]

As a construction method for underground pipes, a method of excavating a buried hole in the ground with an excavator equipped with an excavating mechanism such as an auger at the tip and then digging the excavator to excavate the buried pipe is used. Yes, it is called the so-called auger method or propulsion method.

On the other hand, as a material for underground pipes, soft underground pipes such as vinyl chloride pipes, which are lightweight and inexpensive to manufacture, have come to be used in place of steel pipes and fume pipes that have been conventionally used. It is also considered to adopt the above-mentioned propulsion method for burying a soft buried pipe.

FIG. 6 schematically shows a conventional buried pipe propulsion method. After excavating a vertical hole V in the ground E, a horizontal buried hole H is excavated from the vertical hole V. Buried hole H
In order to excavate, the excavation device 1 provided with an excavation mechanism 10 such as an auger that is rotationally driven at the tip is propelled forward while excavating the ground E to excavate a horizontal buried hole H.
Behind the excavator 1 is connected a drive shaft 2 that houses an auger screw 11 for supplying a rotational drive force to the excavation mechanism 10 and discharging the excavated soil.
Since the drive shaft body 2 needs to pass through the vertical hole V and be inserted into the embedded hole H, the drive shaft bodies 2 of fixed lengths matching the dimensions of the vertical hole V are successively added. Excavator 1
At the same time as excavating the embedded hole H, the embedded pipe 3 is inserted into the outer periphery of the drive shaft body 2 to propel the embedded pipe 3 into the embedded hole H. As for the buried pipe 3, similarly to the drive shaft body 2, one manufactured to a fixed length is successively added.

In order to propel the excavation device 1 and the buried pipe 3 forward against the frictional resistance of the ground E and the like, thrust is provided by a hydraulic jack or the like provided in the vertical hole V at the end of the row of the buried pipes 3. In addition to propelling the buried pipe 3 forward, the excavation device 1 that abuts the tip of the buried pipe 3 is also propelled forward.

[Problems to be Solved by the Invention]

However, when the number of additional pipes 3 of the buried pipe 3 increases and the total length of the buried pipe 3 buried in the ground becomes long, the frictional resistance between the buried pipe 3 and the ground E increases, so that the thrust force applied to the tailmost buried pipe 3 is increased. Also needs to be increased, and the stress generated in the buried pipe 3 by this thrust also increases.

However, in the case of the soft buried pipe 3, since there is no proof stress like the steel pipe and the fume pipe, there is a problem that deformation or damage occurs at a place where high stress occurs, such as at the tail end of the buried pipe 3.

In order to solve the above-mentioned problems, the tip end of the buried pipe 3 is fixed to the excavator 1 without applying thrust to the tail end of the buried pipe 3, and the drive connected to the rear of the excavator 1 A method of pushing the excavation device 1 with the drive shaft body 2 and at the same time pulling the row of the buried pipes 3 with the excavation device 1 by applying a thrust force to the tail end of the shaft body 2 with a hydraulic jack or the like has been considered.

However, even in the above method, since the friction resistance generated when the entire three rows of the subsequent embedded pipes propel the ground E is added to the tip of the embedded pipe 3 fixed to the excavation device 1, the tip of the embedded pipe 3 is Very large stress was generated and deformation and damage were likely to occur. That is, in any of the methods, the thrust (or traction force) is applied only to the rearmost or the most distal end of the buried pipe 3 and the entire row of the buried pipes 3 in front or behind the thrust is attempted to be propelled. The frictional resistance of the ground E acts concentratedly on all the places to which thrust is applied, and large stress is generated there, causing deformation and damage.

Due to such a problem, the conventional propulsion method cannot perform long-distance burying of the soft burying pipe, and it is necessary to repeat the burying work for a relatively short distance. Therefore, there is a drawback that the work efficiency of the burial construction is low and the construction cost is high. In addition, the above problems,
Not only the buried pipe 3 made of a soft material, but also a steel pipe or a fume pipe, a thin pipe is used, or when the caliber of the pipe is increased to increase the necessary propulsion force, that is, compared with the caliber. If the wall thickness is small, the end portion is likely to be damaged or deformed, and the same problem as described above occurs.

Therefore, an object of the present invention is to prevent the buried pipe from being deformed or damaged in the propulsion and burying method for the buried pipe as described above so that a high stress is not locally generated in the buried pipe, and the buried pipe is continuously extended over a long distance. It is an object of the present invention to provide a method and a device that enable the burial construction.

[Means for solving the problem]

The method for propulsion and embedding a buried pipe according to claim 1 of the present invention comprises:
It includes an excavating process, a connecting process, an inserting process, a fixing process, and a burying process. In the excavation process, the buried hole is excavated by the excavation means. In the connecting step, the drive shaft body is sequentially connected to the rear of the excavating means. In the inserting step, the embedded pipes are connected to each other while inserting the embedded pipes around the outer periphery of the drive shaft. In the fixing step, a plurality of expansion bags fixed to the tips of a plurality of columns extending radially from the drive shaft and arranged at intervals in the circumferential direction are inflated and pressed against the inner wall surface of the embedded pipe. Then, the embedded pipe is held and fixed to the drive shaft. In the burying step, the drive shaft is advanced to excavate the burial hole and bury the buried pipe.

A propulsion embedding device for an embedding pipe according to claim 2 of the present invention comprises:
A buried embedding device for excavating an embedding hole and for sequentially embedding and embedding an embedding pipe that is connected to the embedding hole.The embedding means excavates the embedding hole, and is sequentially connected behind the excavating means. A drive shaft that drives the excavating means and transmits a forward propulsive force to the excavating means, a plurality of expansion bags that are installed separately along the outer periphery of the drive shaft, and a pressure medium to the expansion bag. A pressure medium supply means for supplying the pressure medium and an expansion mechanism including a plurality of columns extending in the radial direction from the drive shaft and arranged at intervals in the circumferential direction and having expansion bags respectively fixed to the ends thereof are provided.

As the excavation means, a normal excavation means similar to that used in the conventional propulsion method is used, and for example, an excavation mechanism such as an auger for excavating the ground while rotating is provided, and the rear end of the excavation means is used. A drive shaft is attached to the. The excavation means may be provided with a direction correction jack mechanism or the like for correcting the excavation direction.

The drive shaft basically has the same structure as a normal drive shaft used in a conventional propulsion method. For example, the auger screw for driving the auger of the excavating means and discharging the soil excavated by the auger etc. is accommodated, the tip of the auger screw is connected to the auger of the excavating means, and the auger screw is accommodated. A cylindrical body is adapted to be connected to the rear end of the excavating means, and by applying a propulsive force to the drive shaft,
It is designed to be propelled forward together with the excavation means at the tip.

The expansion mechanism installed on the outer periphery of the drive shaft has an expansion bag. The expansion bag body is formed of a material such as rubber that is elastically inflatable into a bag shape, and has a pressure medium supply port in a part thereof, and the supply port has pressure air, pressure water, pressure oil, or the like. Is supplied, the inflatable bag body can be inflated. The inflatable bag body is attached to the drive shaft body in a state of being inflatable at least in the outer peripheral direction of the drive shaft body,
A supply pipe for supplying a pressure medium is connected to the supply port of the expansion bag.

A plurality of expansion bags are installed along the outer periphery of the drive shaft, and each expansion bag expands in the outer peripheral direction to press the inner wall surface of the embedded pipe inserted in the outer periphery of the drive shaft, The embedded pipe can be held and fixed to the drive shaft by the friction holding force between the outer surface of the expansion bag and the embedded pipe. In the state where the pressure medium is not supplied to the expansion bag, the outer diameter of the expansion bag is smaller than the inner diameter of the embedded pipe, and the embedded pipe can be freely inserted into the outer periphery of the drive shaft. .

The number of expansion bags to be installed on the outer periphery of the drive shaft can be freely set in consideration of the inner diameter of the buried pipe, the shape and size of the expansion bag, and the like. The expansion bag may be installed at equal angular intervals along the outer periphery of the drive shaft, or if the pressing force can act uniformly on the buried pipe in the entire circumferential direction, the expansion bag is not necessarily the same. It does not have to be an interval. In the case where the excavation means is provided with a collimation target for measuring the excavation direction of the buried hole, the expansion bag is arranged so as not to interfere with the optical path of the laser beam with which the collimation target is irradiated. .
Further, it is also necessary to dispose the expansion bag body between the expansion bag bodies so as to secure a wiring / pipe space such as an electric cable or a hydraulic hose for operating the excavating means.

The expansion bag may be provided over the entire length in the axial direction of the drive shaft, or if sufficient holding and fixing force is obtained,
It may be provided only in a part in the axial direction. Further, one inflatable bag may be provided over the entire length of the drive shaft in the axial direction, or an inflatable bag divided into a plurality of pieces in the axial direction may be provided.

If the outer diameter when the expansion bag is attached to the drive shaft can be changed, it is possible to easily cope with buried pipes having different inner diameters. If the inner diameter of the buried pipe is slightly different,
It is possible to deal with this by simply adjusting the amount of pressure medium supplied to the expansion bag and the supply pressure.

If the outer circumference of the expansion bag is covered with a covering member that is fixed to the drive shaft, and this covering member is pressed against the inner wall surface of the buried pipe by the expansion of the expansion bag, the covering member will expand. It is possible to protect the bag body and prevent an axial force from being applied to the inflatable bag body.

When constructing a single row of buried pipes, if all of the buried pipes are held and fixed to the drive shaft by an expansion mechanism, it can be held and fixed most reliably, but the frictional resistance of the ground is small and the work is simplified. In order to achieve this, it is possible to carry out by merely holding and fixing only a part of the embedded pipes in the embedded pipe row to the drive shaft body by the expansion mechanism. In this case, a drive shaft body having an expansion mechanism and a drive shaft body not having an expansion mechanism can be used together as the drive shaft body.

As the buried pipe, those made of various pipe materials commonly used for sewer pipes and the like can be used, but in particular, as those capable of satisfactorily exerting the effect of the present invention, such as soft vinyl chloride pipe and polyethylene pipe Other examples include synthetic resin tubes and other soft materials having relatively poor durability. Further, the present invention is a FRP pipe, a FRP pipe having a resin concrete layer in the intermediate layer, a metal pipe and a fume pipe (particularly,
It can also be applied to the burial construction of pipes whose wall thickness is smaller than the diameter. The diameter of the buried pipe is usually about φ200 mm to φ800 mm, but if necessary, a diameter outside the above range can be used.

[Action]

An expansion mechanism that presses the inner wall surface of the buried pipe at an appropriate point in the middle of the buried pipe row that connects a large number of buried pipes when burying the buried pipes one after another for propulsion and burying. If the drive shaft is held and fixed from the inside, a large stress does not occur only at the last position or the most advanced position of the buried pipe row, unlike the conventional method. This is because the thrust on the buried pipe acts in the middle of the buried pipe row,
The stress generated at the holding point where thrust is applied is only the frictional resistance applied to the buried pipe in front of or behind it,
The frictional resistance of the entire buried pipe row is much smaller than that of the conventional method in which a concentrated stress acts at one location. Since the expansion mechanism presses the inner wall surface of the buried pipe to hold the buried pipe, it is possible to hold an arbitrary part in the middle of the buried pipe row, and to hold a plurality of parts of one buried pipe. It becomes possible to hold and reduce the frictional resistance, that is, the thrust, which is borne by one holding point, and as a result, the stress generated at each holding point of the buried pipe can be greatly reduced. Further, since the drive shaft is provided with a column extending in the radial direction and the respective expansion bags are fixed to the ends thereof, the embedded pipe can be sufficiently pressed even if the expansion bag is made small.

The expansion bag of the expansion mechanism is elastically deformed along the shape of the inner wall surface of the embedded pipe and presses against the embedded pipe in a close contact with a wide area, so that the embedded pipe can be held and fixed securely. Hard to scratch the buried pipe.

The expansion mechanism is divided into a plurality of parts along the outer circumference of the drive shaft, and the buried pipe can be evenly held and fixed at a plurality of positions in the radial direction from the inside. Even if some of the expansion bags are damaged or the pressure drops, the remaining expansion bags can hold and fix the buried pipe. Since there is a space between the plurality of inflatable bags, it is possible to pass a wire or the like for operating the excavating means through this space.

If the diameter of the buried pipe is changed, change the outer diameter of the expansion bag to be installed on the drive shaft, change the number of installations, or change the supply pressure of the pressure medium supplied to the expansion bag. Can be dealt with.

In addition, if the expansion bag is provided continuously over the entire outer circumference of the drive shaft, if a hole is made even at one location on the expansion bag, the pressing force in the entire circumferential direction will be lost and the buried pipe will be retained. It cannot be fixed. Also, since the pressure medium inside the expansion bag that is interposed between the buried pipe and the drive shaft moves freely in the circumferential direction,
The centers of the embedded pipe and the drive shaft are not fixed, and the centers of the drive shaft and the embedded pipe are misaligned. It is not possible to pass a surveying laser beam or various wiring and piping. When the diameter of the buried pipe changes, the entire expansion bag must be recreated.

〔Example〕

Next, embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 schematically shows the buried state of the buried pipe 3. First, a vertical hole V is excavated in the ground E, and the vertical hole V is then cut.
From the middle of the step, the buried hole H is excavated in the horizontal direction. For excavating the horizontal buried hole H, the auger, that is, the excavating means 1 including the excavating mechanism 10 is driven while being driven by the drive shaft body 2 connected to the rear of the auger mechanism. The auger screw 11 is housed in the and is adapted to rotate the auger 10 and discharge the excavated soil. This is exactly the same as the conventional method.

In the method according to the present invention, the expansion mechanism 4 for holding and fixing the embedded pipe 3 is provided at an appropriate position of the drive shaft body 2, and the expansion mechanism 4 expands to the outer peripheral side to thereby expand the expansion mechanism. The outer peripheral surface of 4 presses the inner wall of the buried pipe 3,
The embedded pipe 3 is held and fixed from the inside by the expansion mechanism 4, that is, the drive shaft 2.

2 to 4 show the detailed structures of the drive shaft body 2 and the expansion mechanism 4. The drive shaft body 2 has a tubular shape as a whole, and has a normal auger screw 11 or an excavator inside. A soil discharge path is provided, and at the front and rear ends,
Connection flange parts 20 and 20 for connecting the drive shaft bodies 2 to each other
Is provided. A plurality of expansion mechanisms 4 are provided on the outer peripheral surface at substantially circumferential intervals over substantially the entire length of the drive shaft 2 in the longitudinal direction. Guide members 22 fixed so as to project from the outer peripheral surface are provided outside the expansion mechanism 4 and at positions near both ends of the drive shaft 2. The guide member 22 has an arcuate curved surface whose outer peripheral surface is substantially along the inner wall surface of the embedded pipe 3, and when the drive shaft body 2 is inserted into the embedded pipe 3, the guide member 22 is attached to the inner wall surface of the embedded pipe 3. The drive shaft body 2 can be smoothly inserted and guided by being slid along it.

The expansion mechanism 4 has a plurality of struts 41 projecting in the radial direction on the outer periphery of the drive shaft body 2 along the axial direction. The struts 41 are attached to the upper end of the struts 41. An expansion bag 40 made of an elastic material such as rubber is attached. Inflatable bag
Reference numeral 40 denotes a slender flat shape along the axial direction of the drive shaft body 2. Both ends of the expansion bag body 40 are sandwiched by tightening plates 45 and sealed to be fixed to the receiving plate portion 42. A valve 43 is attached to each. By supplying a pressure medium such as air, water or oil from the valve 43 into the expansion bag body 40, the expansion bag body 40 is inflated toward the outer peripheral side. In the state where the pressure medium is not supplied to the expansion bag body 40, the outer diameter of the expansion bag body 40 is smaller than the inner diameter of the buried pipe 3 and smaller than the outer diameter of the guide member 22. When the pressure medium is supplied and the expansion bag body 40 expands in the outer peripheral direction, the outer diameter of the expansion bag body 40 becomes larger than the outer diameter of the guide member 22, and the inner wall surface of the buried pipe 3 is pressed. There is. The inflatable bag body 40 has an elongated flat shape along the axial direction as described above, and is miniaturized in the circumferential direction and the radial direction, respectively. Even if the expansion bag body 40 is miniaturized in this way, since the expansion bag body 40 is fixed to the tip of the support column 41 and arranged near the inner wall of the buried pipe 3, the expansion bag body 40 is not The force pressing against the inner wall is sufficient.

In order to supply the pressure medium to the expansion bag body 40, the pressure medium pipe 5 is connected to the valve 43, and the pressure medium pipe 5 is supplied from a pressure medium source (not shown) installed inside the standing hole V or on the surface of the ground.
Supply the pressure medium. As shown in FIG. 4, in the state where a plurality of drive shafts 2 are connected, the valves 43 of the front and rear expansion bags 40 are sequentially connected by the pressure medium pipe 5, and the entire drive shaft row 2 is All the inflation bags 40 connected in the axial direction can be inflated at the same time, or the pressure can be released to deflate the inflation bags 40 after the completion of construction.

In the illustrated embodiment, six expansion bags 40 are installed along the circumferential direction of the drive shaft body 2, but the number of expansion bags 40 installed can be arbitrarily changed. As the number of expansion bags 40 installed in the circumferential direction of the drive shaft 2 increases, the entire circumference of the buried pipe 3 can be pressed uniformly and securely held, but if the expansion bags 40 increase, the number of parts increases. It takes more time to manufacture and handle.
The expansion bags 40 are arranged substantially evenly in the circumferential direction of the drive shaft 2, but as shown in FIG. 3, they are provided in the excavation mechanism 10 when measuring the linearity of the buried hole H. The expansion bag body 40 is not provided in the optical path portion for irradiating the collimation target 6 with the laser beam. Further, the expansion bag 40 is not provided at the symmetrical position of the collimation target 6, but this is for the purpose of removing the variation of the expansion pressing force in the radial direction and passing various wirings and pipes to the excavation means 1. It is made available.

In order to hold and fix the embedded pipe 3 to the drive shaft body 2, the expansion pressing force applied from the expansion bag body 40 to the embedded pipe body 3 is set by setting the outer diameter of the expansion bag body 40 with respect to the inner diameter of the buried pipe body 3, and the expansion bag body. body
It can be adjusted by the supply pressure of the pressure medium supplied to 40.

Since the diameter of the buried pipe 3 to be buried is various, the outer diameter of the expansion bag body 40 installed on the drive shaft body 2 is also designed according to the inner diameter of the buried pipe 3, but the inner diameter of the buried pipe 3 is small. The difference can be absorbed by the supply pressure of the pressure medium. Also,
When changing the outer diameter of the expansion bag 40 to match the inner diameter of the buried pipe 3, the shape and size of the expansion bag 40 itself may be changed, but the expansion bag 40 is not changed and It can also be adapted by changing the length. If the pillar 41 is structured to be expandable and contractible in the radial direction, one drive shaft body 2
And the expansion mechanism 4 is provided with a plurality of types of buried pipes 3 having different inner diameters
Can be easily accommodated.

On the outer peripheral surface of the expansion bag 40, in order to enhance the holding and fixing force of the buried pipe 3, a fine concavo-convex shape is formed to increase the coefficient of friction, or a reinforcing member is attached to reinforce the outer peripheral surface. You can also keep it.

A propulsion embedding method using the above device will be described.

It is the same as the conventional method to excavate the buried hole H by horizontally excavating from the vertical hole v while adding the drive shaft 2 to the rear of the excavating means 1. The embedded pipe 3 is held and fixed to the drive shaft body 2 before being propelled into the embedded hole H. In order to hold and fix the embedded pipe 3 on the drive shaft 2, first, the drive shaft 2 is inserted into the embedded pipe 3 in a state where the expansion bag 40 of the drive shaft 2 is contracted. At this time, since the guide member 22 of the drive shaft body 2 abuts on the inner wall surface of the buried pipe 3 and slides,
Can be inserted smoothly. After the embedded pipe 3 is completely inserted into the outer periphery of the drive shaft body 2, the pressure medium pipe 5 is connected to the expansion bag body 40 to inflate the expansion bag body 40. By pressing the inner wall surface, the embedded pipe 3 is held and fixed to the drive shaft body 2. In this state, if the embedded pipe 3 is propelled into the embedded hole H together with the drive shaft 2, the ground E
The buried pipe 3 is propelled and buried in the buried hole H against the frictional resistance. When the embedded pipe 3 and the drive shaft body 2 are replenished, the valves 43 of the respective expansion bags 40 are sequentially connected by the pressure medium pipe 5. A specific example of the set pressure of the pressure medium supplied to the expansion bag 40 is 7.0 kg / in the pressure supply source.
Supply a pressure medium of about cm ² to the expansion bag 40 and
When the internal pressure of 2.5 kg / cm ² is used normally and 5.0 kg / cm ² at maximum, the thrust that can be applied to the buried pipe 3 is 7.45 to
It will be about n.

When the buried hole H reaches the intended vertical hole V and the buried pipe 3 is buried in the entire buried hole H, the expansion bag body 40 of the drive shaft body 2
The pressure is released, the holding and fixing of the buried pipe 3 to the expansion bag 40 and the drive shaft body 2 is released, and the drive shaft body 2 is removed from the buried hole H, whereby the burying construction of the buried pipe 3 is completed. .

Next, in the embodiment shown in FIG. 5, the outer periphery of the expansion bag body 40 is covered with a covering member 47 for transmitting frictional force. Cover member 47
Consists of a rubber material etc. with excellent strength and wear resistance,
Both ends of the covering member 47 have receiving plates 42 fixed to the drive shaft 2.
And is fixed to the tightening plate 45. The covering member 47 and the inflatable bag body 40 are not directly fixed. The inflatable bag body 40 on the lower side in FIG. 5 is in a non-inflated state, the inflatable bag body 40 is contracted to be flat, and a gap is formed between the inflatable bag body 40 and the covering member 47. In this state, the friction holding force does not work between the covering member 47 and the inner wall surface of the buried pipe 3, and the buried pipe 3 can freely move in the axial direction. As shown in the upper side of FIG. 5, when the expansion bag body 40 expands in the outer peripheral direction, the expansion bag body 40
Presses the inner wall surface of the buried pipe 3 via the covering member 47. The axial frictional resistance force applied from the buried pipe 3 is transmitted from the tightening plate 45 to the drive shaft body 2 via the covering member 47, so that no axial force is applied to the expansion bag body 40. The outer surface of the covering member 47 may be provided with irregularities or the like in order to enhance the friction holding force.

According to the above-described embodiment, the expansion bag 40 need only act in the radial direction with respect to the buried pipe 3, and does not require so much strength. Therefore, use a material having excellent elasticity or a relatively thin material. Will be possible. Further, if the expansion bag body 40 is protected by the covering member 47 having excellent strength, it is possible to prevent the expansion bag body 40 from being damaged during handling of the drive shaft body 2. In particular, since the covering member 47 abuts on the inner wall surface of the buried pipe 3, there is no fear of the expansion bag 40 coming into contact with the buried pipe 3 at the time of inserting the buried pipe 3 and damaging the expansion bag 40.

〔The invention's effect〕

According to the method and device for burying a buried pipe according to the present invention described above, the buried pipe is held and fixed to the drive shaft body by the expansion mechanism from the inside, and the drive shaft body and the excavating means are driven together. The thrust is applied to the embedded pipe fixed to the drive shaft to propel it forward. for that reason,
Since the thrust can be transmitted to an arbitrary position in the middle of the buried pipe line, it is not necessary to apply the thrust to only the last position or the most distal end of the many buried pipe lines as in the conventional case.
Therefore, in the structure of the buried pipe, it is possible to avoid both ends where stress concentration is likely to occur and to apply a thrust to the middle part, and by holding a plurality of positions in the middle of the buried pipe row to disperse the thrust, The stress generated in the buried pipe can be significantly reduced. As a result, it is possible to reliably prevent the embedded pipe from being deformed or damaged due to the stress during propulsion. Further, since the drive shaft is provided with a column extending in the radial direction and the respective expansion bags are fixed to the ends thereof, the embedded pipe can be sufficiently pressed even if the expansion bag is made small.

Further, according to the present invention, since the expansion bag body expanded by the supply of the pressure medium presses the inner wall surface of the embedded pipe, the embedded pipe is held and fixed to the drive shaft body. It can be held and fixed to the embedded pipe without damaging or locally deforming it.

In particular, since a plurality of inflatable bags that are dividedly installed along the outer periphery of the drive shaft are pressed against the embedded pipe to hold and fix them, the entire circumferential direction of the embedded pipe can be uniformly pressed and held and fixed. It is possible and there is no risk of distortion or deformation of the buried pipe. Even if some of the plurality of inflation bags are damaged or the pressure drops, the remaining inflation bags can hold and fix the buried pipe, which is also safe and reliable. Are better.
The space between the plurality of expansion bags can be used as an optical path of a collimating laser beam and a passage for various wirings, and the expansion bag does not interfere with the operation of the excavating means or the collimation work. Even if the diameter of the embedded pipe changes, it is only necessary to change the position of the outside diameter of the expansion bag body with respect to the drive shaft, so that the change in pipe diameter can be easily accommodated.

As described above, according to the method and the device according to the present invention, a long-distance propulsion burying method is used by using a burial pipe made of a soft material having relatively low yield strength or a burial pipe having a wall thickness thinner than the caliber. It can also be carried out, the efficiency of the burial construction can be improved, the construction cost can be reduced, and the application of the burial construction for the promotion and burial of the buried pipe can be greatly contributed.

[Brief description of drawings]

FIG. 1 is a sectional view showing a construction state of an embodiment according to the present invention, FIG. 2 is an enlarged structural view of a drive shaft, FIG. 3 is a vertical sectional view, FIG. 4 is a structural view in use, and FIG. FIG. 6 is a structural view of a drive shaft body showing another embodiment, and FIG. 6 is a sectional view showing a construction state of a conventional example. 1 ... Excavating means, 2 ... Drive shaft, 3 ... Buried pipe, 4 ...
… Expansion mechanism, 40 …… Expansion bag, 43 …… Valve, 5 …… Pressure medium piping, H …… Buried hole

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Keisuke Izaki 1-20-4 Takinocho, Nagaokakyo City, Kyoto Prefecture (56) References JP-A-58-153896 (JP, A) SAIKAI Sho-58-69088 (JP) , U) Actual development Sho 48-103602 (JP, U)

Claims (2)

[Claims] 1. A digging step of digging a buried hole by digging means, a connecting step of sequentially connecting a drive shaft body to the rear of the digging means, and buried pipes while inserting a buried pipe into the outer periphery of the drive shaft body. And the insertion process of connecting the two, and inflating a plurality of expansion bags fixed to the tips of a plurality of columns extending in the radial direction from the drive shaft and arranged at intervals in the circumferential direction to bury the buried pipe. Propulsion of the embedded pipe, which includes a fixing process of pressing the embedded pipe to the drive shaft body by holding it against the inner wall surface, and a burying process of advancing the drive shaft body to excavate the buried hole and bury the buried pipe. Buried method. 2. A propulsion embedding device for an embedding pipe, comprising excavating an embedding hole and propelling successively embedding embedding pipes to the embedding hole, the excavating means excavating the embedding hole, and a rear part of the excavating means. Drive shaft for driving the excavating means and transmitting forward propulsive force to the excavating means, a plurality of expansion bags arranged separately along the outer periphery of the drive shaft, and an expansion bag An expansion mechanism comprising a pressure medium supply means for supplying a pressure medium to the body, and a plurality of columns extending in the radial direction from the drive shaft body and arranged at intervals in the circumferential direction and having inflation bag bodies fixed to the tips respectively. , A buried pipe propulsion and burying device.