JPH0730671B2 - Buried pipe propulsion method - Google Patents

Description

Description: [Industrial field of application] The present invention relates to a propulsion method for a buried pipe, and more specifically, to the ground without excavating the ground when burying an underground buried pipe such as a sewer pipe. The present invention relates to a so-called propulsion method in which a buried pipe is buried in a buried hole formed while directly forming the buried hole.

[Conventional technology]

Since the propulsion method does not require wide excavation of the ground along the buried route, research and development is being promoted as a preferable method for construction sites where there is a large amount of traffic and it is difficult to restrict traffic.

In the conventional general propulsion method, first, a vertical shaft is excavated and formed in the ground, and a horizontal burying hole is formed on the side surface of the vertical shaft by a device called a front conductor. The method of forming the buried hole includes a method of forming a buried hole by excavating the ground with an excavating means such as an earth auger provided in the front conductor, or a method of consolidating the ground with the conical tip of the front conductor There is a method of forming the soil, and an appropriate method is selected according to the soil quality and construction conditions.

Buried pipes formed to a fixed length are connected to the rear of the leading conductor while being added one after another. At the end of this buried pipe,
Applying propulsive force with the original push jack installed in the vertical shaft,
The formation of the buried hole and the laying of the buried pipe by the leading conductor are carried out while promoting the buried pipe row and the leading conductor.

The use of a fixed length buried pipe in the propulsion method means that there is a limit to the length of the buried pipe that can be handled depending on the width of the shaft in order to propel the prefabricated buried pipe into the buried hole through the shaft. Because there is. In addition, it is necessary to use a fixed length buried pipe in order to transport and store the buried pipe from the manufacturing plant to the construction site.

The seams of the fixed length buried pipes are connected by butt-bonding the end faces of the buried pipes or fitting the end faces of the buried pipes to a collar. In the case of collar fitting, a waterproof rubber is provided on the contact surface between the buried pipe and the collar to prevent the entry of groundwater or the like.

[Problems to be Solved by the Invention]

However, in the conventional propulsion method as described above,
There is a problem that the construction of the joint portion between the buried pipes is troublesome, the watertightness of the joint portion is poor, and the strength is also weak.

This is because every time one buried pipe is propelled into the buried hole, it is necessary to join the next buried pipe to the previous buried pipe. When adhering the end face of the buried pipe, it takes time for the adhesive strength to be fully exerted, and when fitting and connecting with a collar with a waterproof rubber, care must be taken not to damage the waterproof rubber. It was extremely troublesome and complicated work, such as not happening. In addition, since these operations are performed manually in a narrow vertical shaft at the construction site, variations in the finish occur due to the technology of the workers, the joints of the buried pipes are not completely joined, Is often not fully exerted or the strength is reduced.

Furthermore, since the seam is inevitably weaker than the main body of the buried pipe, if the propulsion force from the original push jack or the friction resistance from the ground is applied during propulsion, the seam will peel off. However, there arises a problem that the collar and the water blocking rubber are separated and the end portion of the buried pipe is damaged.

If the joints at the joints are incomplete, groundwater and earth and sand will enter the buried pipe, and when used as sewers, etc.
There is a risk that the planned flow of water in the pipe will not be secured, or the wastes flowing in the pipe will leak into the ground, causing pollution problems.

In particular, in the conventional propulsion method, a pushing force is applied to the tail end of the buried pipe row by the original push jack, and all the buried pipes and the lead conductor are propelled by this propulsion force. Since a large amount of stress is generated, the problem as described above will inevitably occur.

Therefore, an object of the present invention is to eliminate the problem in the conventional propulsion method as described above, by eliminating the joint portion between the buried pipes, eliminating the troublesome joint joining work, and the joint portion is incompletely joined. Another object of the present invention is to provide a propulsion method for buried pipes that can solve problems such as water leakage and strength reduction.

[Means for Solving the Problems]

Among the inventions for solving the above-mentioned problems, in the method for propulsion of a buried pipe according to claim 1, the front conductor is propelled in the ground to form a buried hole, and the buried pipe is driven and buried in the buried hole. In the embedding propulsion method, a long strip-shaped buried pipe made of a plastic material is sequentially curved to join the side edges to form a continuous buried pipe, and then this continuous buried pipe is inserted into the buried hole. Try to promote it.

As the lead conductor, the same one as in the ordinary propulsion method can be used.
As described above, the precursor includes the one provided with an excavating means such as an earth auger, the one provided with a tip for consolidation, the one using both excavation and consolidation, and any structure may be used. Further, it is also possible to use one that circulates and supplies muddy water from the conductor to the ground surface and discharges the excavated earth and sand together with the muddy water. If the leading conductor is provided with a turning means such as a direction control jack for changing the direction of the tip, the direction of the buried hole can be easily corrected. The specific configuration of this diverting means may be the same as that of a normal lead conductor.

In this invention, as a buried pipe, a fixed-length cylindrical pipe is not manufactured in advance as in the conventional propulsion method, but a buried buried pipe material is used to carry out propulsion burial while manufacturing a continuous buried pipe at a construction site. .

The buried pipe material is made of a flexible material such as polyethylene or vinyl chloride, and is formed by continuous molding in a long strip shape.
Use them in the form of a coil for transportation or storage. The width of the buried pipe material is manufactured according to the circumferential length of the buried hole to be constructed, that is, the continuous buried pipe. 1 when a plurality of buried pipe materials are combined to form one continuous buried pipe
The width of one buried pipe material may be the circumferential length of the continuous buried pipe divided by the number of buried pipe materials. In addition, according to the diameter of the buried hole to be constructed, the buried pipe material manufactured in advance with a certain width,
You may make it cut to the required width at the construction site. The buried pipe material may be any plastic material as long as it has plasticity capable of being bent into a cylindrical shape at room temperature or in a heated state, and can exert mechanical strength and durability as the buried pipe in a construction state. When adhering when molding a continuous buried pipe,
Use a material with good adhesiveness or a material with thermal adhesiveness.

In order to bend the strip-shaped buried pipe material into a cylindrical shape, a bending means such as extrusion processing, drawing processing, press processing, etc., which has been conventionally used for bending a synthetic resin plate material or a thin metal plate, is used. For example, if the embedded pipe material is sent between a packing roller having an arcuate curved surface and a spherical roller having a spherical surface corresponding to the curved surface to perform pressure molding, the embedded pipe material is curved in an arc shape. Can be made. Further, by passing the embedded pipe material through the ring-shaped bending frame, the embedded pipe material can be curved with a curvature corresponding to the inner diameter of the bending frame. To make it easier to bend the buried pipe material,
The embedded pipe material may be temporarily softened by means such as heating.

As for the buried pipe material, one buried pipe material may be processed to form the entire circumference of the continuous buried pipe, or a plurality of buried pipe materials may be connected in the circumferential direction to form a continuous buried pipe. .

After bending the embedded pipe material into a cylindrical shape, the side end faces in the longitudinal direction are joined to form a continuous embedded pipe. As a means for joining the side edges of the buried pipe material, a usual joining means for synthetic resin or the like such as adhesion with an adhesive, heat fusion, welding with a resin welding material, ultrasonic pressure welding, or the like can be adopted. Since the side edges in the longitudinal direction are joined while continuously feeding the buried pipe material, a method that allows continuous work is also used as the joining means.

The continuous buried pipe manufactured as described above is pushed into the buried hole. In the present invention, since the continuous buried pipe is continuously manufactured from the buried pipe material and is propelled, it is difficult to apply a large propulsive force to the tail end of the buried pipe with the push jack as in the conventional propulsion method. Therefore, in the present invention, it is preferable that a shaft-shaped propulsion support body is connected to the rear of the front conductor, and a propulsion force is applied to the rear end of the propulsion support body by a pushing jack to propel the front conductor. .

The propulsion support is in the form of a cylindrical shaft that is thinner than the inner diameter of the continuous buried pipe to be laid, and is formed in a fixed length with a fixed length.
The length of the propulsion support is set in consideration of transportation, storage, and handling in the shaft. The propulsion support is connected to the rear of the leading conductor and is sequentially added.

Inside the propulsion support, an auger screw that drives the earth auger of the lead conductor to send the excavated earth and sand backward, hydraulic and pneumatic piping that operates the deflection means of the lead conductor, power cable, etc. Can be stored. Further, in the case of a propulsion support applied to a large-diameter buried pipe, an operator may be allowed to enter the inside of the propulsion support.

In order to propel the continuous buried pipe, if the ground resistance is low, the continuous buried pipe connected to the tip of the buried pipe can be driven by the feeding means such as rollers when continuously bending the buried pipe, It is also possible to fix the tip of the embedded pipe to the rear of the lead conductor and to pull the lead conductor propelled by the propelling support to propel the continuous buried pipe.

However, in the case where the ground resistance is large, or when continuous propulsion for a long distance is performed, the method according to claim 2 of the present invention, which will be described below, is adopted in order to prevent excessive stress from being generated in the continuous buried pipe. Preferably.

In the invention according to claim 2, the continuous buried pipe is fitted and inserted into the outer periphery of the propulsion support body which is sequentially connected to the rear of the leading conductor, and the continuous buried pipe is held and fixed to the propulsion support body, and the continuous support pipe is changed from the propulsion support body to the continuous buried pipe. Try to convey the driving force.

The holding and fixing means holds the continuous buried pipe from the inner surface of the continuous buried pipe in a state where the continuous buried pipe is fitted and inserted into the outer periphery of the propulsion support, and counters the frictional resistance force applied from the ground to the buried pipe during propulsion to continuously The buried pipe may be fixed to the propulsion support. Specifically, for example, an expansion body made of a rubber bag or the like that expands when a pressure medium such as air is supplied is provided on the outer periphery of the propulsion support, and the expansion body is expanded to contact the inner surface of the continuous buried pipe. When pressed in contact, the continuous buried pipe is held and fixed to the expander by the frictional supporting force between the expander and the continuous buried pipe. Further, a friction holding plate that mechanically moves from the outer circumference of the propulsion support to the continuous buried pipe side to press the inner surface of the buried pipe is provided, or an appropriate locking recess or protrusion is provided on the inner surface of the continuous buried pipe. An engagement member that is formed and engages with the engagement concave and convex portion may be installed on the propulsion support, or a holding structure or a fixing structure in various mechanical devices may be applied.

As a concrete structure of the holding and fixing means as described above, Japanese Patent Application No. 63-29, which the present inventors have previously invented and filed a patent application,
The techniques disclosed in Japanese Patent Application No. 1-240408 and 8619 and Japanese Patent Application No. 1-183271 can be used.

A propulsion method using each device member having the above-described structure will be described.

It is normal to form a buried hole by excavating a vertical shaft at an appropriate distance in the ground of the construction route where the buried pipe is to be laid and propelling the front conductor from the side of the vertical shaft into the ground. It is the same as the construction method. However, according to the method of the present invention, the continuous buried pipe is fed into the buried hole while continuously manufacturing the continuous buried pipe from the above-mentioned buried pipe material, instead of adding the fixed length buried pipe to the rear of the leading conductor. Go out. The buried pipe material and a device for producing a continuous buried pipe from the buried pipe material are usually installed in a shaft, but a part of the device may be installed on the surface of the earth.

A propulsion support is connected to the rear of the leading conductor and is sequentially added. The propulsion support is connected to the lead conductor through the center of a continuous buried pipe that is continuously manufactured. If necessary, fix the tip of the continuous buried pipe to the lead conductor, and if the continuous buried pipe is to be held and fixed to the propulsion support, operate the holding and fixing means while sequentially connecting the propulsion supports. Then, the continuous buried pipe in that part is held and fixed.

In this state, a propulsion force is applied to the propulsion support by using a pushing jack or the like. The propulsive force applied to the propulsion support body is sequentially transmitted to the front propulsion support body and the frontmost tip conductor, and is also transmitted to the continuous buried pipe through the holding and fixing means or the front conductor.

By continuously performing the above-described work, the buried hole is formed by the leading conductor and the continuous buried pipe is propulsively buried. In the present invention, the work of connecting and joining each buried pipe as in the conventional method is unnecessary.

When the lead conductor is propelled to the intended shaft, the lead conductor and the propulsion support are removed from the buried hole, leaving only the continuous buried pipe in the buried hole. The propulsion supports are disengaged from each other and the individual standard length propulsion supports are sequentially removed from the burial hole and shaft. Further, the holding and fixing of the continuous buried pipe by the holding and fixing means is also sequentially released. Since the rear end portion of the continuous buried pipe is connected to the buried pipe material, the continuous buried pipe is cut at an appropriate position to separate it from the buried pipe material, or the end surface is finished. The remaining buried pipe material will be used for the next construction. After the lead conductor and the propulsion support are removed, the inner surface of the continuous buried pipe is subjected to finishing treatment, the equipment inside the shaft is removed,
Processes such as constructing manholes in the vertical shaft are performed in the same manner as in the ordinary propulsion method. In addition, since the continuous buried pipe has no axial seam, it is not necessary to perform water sealing treatment on the axial seamed portion as in the conventional propulsion method, but along the longitudinal direction, the side edge of the buried pipe is Since there is a seam, if necessary, finish processing such as reinforcement is performed on this seam.

[Action]

If a continuous buried pipe is formed from a long strip of buried pipe material and the formed continuous buried pipe is continuously fed into the burying hole for propulsion burying, it is not necessary to use a fixed length buried pipe. That is, the long strip of buried pipe material is easy to carry into the shaft if it is wound in a roll or put together.
Further, if the buried pipe material is continuously fed from the surface of the ground to the shaft and the buried hole, it is not necessary to carry the entire buried pipe material into the narrow shaft.

Since the continuous buried pipe according to the present invention is seamless in the axial direction, unlike the conventional propulsion method, there is no need to attach fixed-length buried pipes at the joints or join collars to each other. become. In addition, even in a continuous buried pipe, a seam along the side edge of the buried pipe material can be made, but the joining of this seam part is
Since it can be performed continuously as a part of the work to manufacture a continuous buried pipe from the buried pipe material, it is not necessary to interrupt the propulsion for the joining work, and unlike the conventional propulsion method, the joint part can be manually operated. There is no need to carry out joining work.

If there is no axial seam in the continuous buried pipe, the sealing property of the seam part may be deteriorated or the seam part may be damaged by the axial force such as the propulsive force applied to the continuous buried pipe or the ground resistance force. There is no problem. Note that the continuous buried pipe also has a seam that continues in the longitudinal direction along the side edge of the buried pipe material, but the large force applied to the buried pipe in the propulsion method is that the propulsion force and the ground friction resistance force are The force is predominant and there is no such force that opens the seam along the length of the continuous buried pipe. Moreover, once the continuous buried pipe has entered the buried hole, pressure is applied from the ground in the central direction, and a force is applied in a direction in which the joint portion along the longitudinal direction of the continuous buried pipe is strongly joined. There is no risk of the joint breaking or leaking.

Further, if the continuous buried pipe is held and fixed to the propulsion support body sequentially connected to the rear of the leading conductor, the continuous buried pipe is held and fixed to the propulsion support body at a plurality of positions in the longitudinal direction, and the plurality of holding pipes are held. Propulsion can be transmitted from the propulsion support to the continuous buried pipe at a fixed location. As a result, it is not necessary to apply all the propulsive force to the tail end of the continuous buried pipe, and it is easy to directly drive the continuous buried pipe into the buried hole while continuously manufacturing the continuous buried pipe from the buried pipe material. Become. Further, since the stress generated in the continuous buried pipe is dispersed, the continuous buried pipe is prevented from being damaged or deformed by locally applying an excessive driving force.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a cross-sectional structure of a buried hole in which the propulsion method is being carried out.

First, the leading conductor 10 is arranged at the head. The leading conductor 10 has a cylindrical outer diameter corresponding to the diameter of the buried hole, and is provided with an auger 11 at its tip. The auger 11 excavates the ground while rotating, and the excavated earth and sand is sent to the rear by an auger screw 12 provided behind the auger 11.
On the outer periphery of the rear end of the front conductor 10, there is provided a fitting recess 13 into which the tip of the continuous buried pipe 60 is fitted. A propulsion support 20 is connected to the rear end of the leading conductor 10.

The propulsion support 20 has a shaft-like shape made of a fixed-length steel pipe or the like,
It is connected and fixed to the rear end of the front conductor 10 with a bolt or the like. The propulsion supports 20 are sequentially connected to the rear. The means for connecting the propulsion supports 20 to each other may be, for example, as shown in FIG. 3, by fixing the flange portions 21, 21 provided on the end faces with bolts 22. The trailing end of the propulsion support 20 reaches the starting shaft V and is connected to a propulsive force applying means such as the original push jack 30. The interior of the propulsion support 20 is hollow and the auger screw 23 is inserted therein. The auger screw 23 is sequentially connected to the front and rear, and the tip of the auger screw 23 is connected to the auger screw 12 of the front conductor 10. The earth and sand excavated by the auger 11 of the front conductor 10 is discharged to the rear shaft V via the auger screws 12 and 23.

On the outer periphery of the propulsion support 20, as a holding and fixing means for the continuous buried pipe 60, annular expansion mechanisms are provided near both ends in the axial direction.
50 are provided. FIG. 3 shows the detailed structure of the expansion mechanism 50.

A tubular expansion body 52 made of an elastic material such as rubber is provided so as to surround the outer periphery of the propulsion support body 20. Inflatable body
The inner peripheral side of 52 is fixedly attached to a support frame 54 attached to the propulsion support 20. The expander 52 is provided with a supply / discharge unit 54 for supplying and discharging a pressure medium such as pressure air or pressure oil. The supply / discharge unit 54 is composed of a valve or the like for a normal pressure pipe. In the inflatable body 52 before and after the single propulsion support 20, the supply / discharge sections 54 may be connected to each other by pressure piping. Further, the expansion bodies 52 of the propulsion support body 20 that are connected to each other in the front and rear can also be connected to each other by pressure pipes.

When the pressure medium is introduced into the expander 52 with the continuous buried pipe 60 fitted and inserted in the outer periphery of the propulsion support 20, the expander 52 expands toward the outer periphery, and the outer surface of the expander 52 has the continuous buried pipe 60. It comes into contact with the inner surface of and is pressed (state on the right side in FIG. 3). If a constant pressure is applied to the continuous buried pipe 60 from the expander 52, a friction supporting force is generated between the expander 52 and the continuous buried pipe 60, so that the continuous buried pipe 60 does not shift in the axial direction.
The propulsion support 20 is securely held and fixed. If the amount or pressure of compressed air introduced into the expander 52 is changed,
The pressing force, that is, the holding and fixing force for the continuous buried pipe 60 can be adjusted. When the pressurized air introduced into the expander 52 is released (state on the left side in FIG. 3), the holding and fixing to the continuous buried pipe 60 is released, and the continuous buried pipe 60 is pushed to the propulsion support.
It becomes possible to pull out 20.

As shown in the figure, the structure of the inflatable body 52 is not limited to a tubular shape surrounding the outer periphery of the propulsion support body 20, but also a flat bag-shaped inflatable body extending along the axial direction of the propulsion support body 20 for propulsion support. A plurality of bodies 20 are installed in the circumferential direction of the body 20, and each inflatable body expands in the radial direction to come into contact with the inner surface of the continuous buried pipe 60. As long as it can be held and fixed, a structure other than that shown in the drawing can be adopted.

If the expansion mechanism 50 as described above is used as a holding and fixing means for the continuous buried pipe 60, the expander 52 elastically abuts the inner surface of the continuous buried pipe 60, so that the inner surface of the continuous buried pipe 60 is damaged or deformed. It can be securely held and fixed without causing any trouble, and even if there are variations or errors in the inner diameter of the continuous buried pipe 60, it can be absorbed by the elastic deformation of the expander 52. In addition, since there is no complicated operating mechanism, there is little possibility of failure, and it is possible to easily and reliably hold and fix the continuous buried pipe 60 and release it simply by controlling the supply of pressure medium. You can

Next, in the vertical shaft V, an earth stop wall 42 and a water stop wall 44 are constructed at the opening of the buried hole. Through the through hole 45 in the center of the water stop wall 44, the propulsion support 20 and the continuous buried pipe.
60 is fed into the buried hole. A packing member that abuts the outer peripheral surface of the continuous buried pipe 60 at the peripheral edge of the through hole 45 of the water blocking wall 44.
46 is attached to prevent groundwater or the like that has entered the buried hole from leaking into the vertical shaft V from the through hole 45 of the water blocking wall.

The continuous buried pipe 60 is continuously manufactured in the shaft V from the buried pipe material 62 arranged in a rolled state, and is fed into the buried hole. The structure of the portion for manufacturing the continuous buried pipe 60 from the buried pipe material 62 is shown in detail in FIG.

The embodiment shown in FIG. 2 is a case where one continuous buried pipe 60 is manufactured by using two buried pipe materials 62. Buried pipe material 62
Is made of polyethylene resin or the like, formed into a flat long strip, and used in a state of being rolled into a roll for easy handling.

The embedded pipe material 62 is pulled out from each of the two sets of the embedded pipe material 62 rolls arranged symmetrically with respect to the center line of the embedded hole, and fed between the pair of curving rolls 71, 72.
The curving rolls 71 and 72 are ones having a zigzag roll 71 having an arcuate curved surface recessed in a zigzag shape, and the other is a spherical roll 72 having a spherical surface corresponding to the curving surface.
The flat buried pipe material 62 is curved into an arc shape by passing between the curving rolls 71 and 72.

In front of the bending rolls 71, 72, there are guide rolls 74, 74.
And a cylindrical processing device 76 is provided. Cylindrical processing equipment
The 76 is provided with a bending frame having a processing diameter corresponding to the outer diameter of the continuous buried pipe 60 to be manufactured, and the two buried pipe materials 62 curved to a certain degree of curvature in the previous stage are sent to the cylindrical processing device 76. As a result, the left and right buried pipe members 62 are combined and curved so as to form a complete cylinder, and the desired shape of the continuous buried pipe 60 is obtained. The longitudinal side edges of the buried pipe members 62, 62 are butted against each other, and
It is heat-bonded by a heat fusion mechanism (not shown) provided in 76. The heat fusion mechanism has a structure similar to that of an ordinary heat fusion device for synthetic resins. In this embodiment, since two buried pipe members 62, 62 are used, a longitudinal seam can be formed at two points, the upper end and the lower end in the figure. Therefore, a heat fusion mechanism is provided at a position corresponding to each seam.

The continuous buried pipe 60 sent out by the cylindrical processing device 76 has a perfect cylindrical shape, and a joint portion along the longitudinal direction is also joined. The continuous buried pipe 60 manufactured in this manner is held and fixed from the inner surface side by the holding and fixing mechanism 50 of the propulsion support 20 as shown in FIG. 1, and is propelled into the buried hole.

Next, in the embodiment shown in FIG. 4, one continuous buried pipe 60 is used.
Is a case of manufacturing with one embedded pipe material 62. In this embodiment, in front of the cylindrical processing device 76, a pair of tab-shaped rolls 77, 77 are provided symmetrically with the center line of the embedding hole in between.
The embedded pipe material 62 is fed into the cylindrical processing device 76 through the space between the claw-shaped rolls 77, 77, and the continuous embedded pipe 60 similar to the above is formed. In this embodiment, the cylindrical machining device 76
A heat fusion mechanism for thermally adhering the side edge of the embedded pipe material 62 is provided in the lower part of the.

A propulsion method using each member and device described above will be described.

Propulsion of the front conductor 10 from the side surface of the shaft V into the ground to form a buried hole is performed in exactly the same manner as a normal propulsion method. The propulsion support 20 is sequentially connected to the rear of the front conductor 10. In the vertical shaft V, the buried pipe material 62 is bent into bending processing rolls 71, 7
From 2 to the guide roll 74 and the cylindrical processing device 76, the continuous buried pipe 60 is manufactured and propelled into the buried hole. Therefore, the propulsion support 20 is inserted into the center of the continuous buried pipe 60 from the open portion at the rear end of the continuous buried pipe 60. The continuous buried pipe 60 fed into the buried hole is sequentially held and fixed by the holding and fixing means 50 of the propulsion support 20.

At the end of the propulsion support 20 connected to the rear of the front conductor 10,
If a propulsion force is applied from the source jack in the vertical shaft V, the front conductor 10 and the propulsion support 20 are propelled into the ground,
A buried hole is formed by 10. The continuous buried pipe 60 held and fixed to the propulsion support body 20 is propulsively buried in the embedding hole together with the propulsion support body 20.

When the lead conductor 10 is propelled to the intended vertical shaft, the lead conductor 10 and the thrust support 20 are removed. The propulsion support body 20 is first released from the holding and fixing of the continuous buried pipe 60 by the holding and fixing means 50 and then disassembled and removed one by one. Only the continuous buried pipe 60 remains in the buried hole. In the starting shaft V, the rear end of the continuous buried pipe 60 is cut and separated from the buried pipe material 62 to process the end surface.

As described above, the propulsion burial construction of the burial pipe is completed, but specific steps and work methods other than those described above are
Since it is performed in the same manner as the ordinary propulsion method, detailed description is omitted.

〔The invention's effect〕

According to the buried pipe propulsion method of the present invention described above, the continuous buried pipe is formed from a long strip of buried pipe material, and the continuous buried pipe is continuously fed into the buried hole. In the conventional method, the axial seam for adding the fixed length buried pipe is eliminated, and the work of joining the axial seams is also unnecessary.

The decision is to reduce the time and labor required to join the fixed-length buried pipes, and at the same time eliminate the risk of joint failure and sealing failure at the seam, and reduce the strength at the seam. Therefore, the strength or durability of the entire buried pipe is improved.

Furthermore, if the continuous buried pipe is held and fixed to the propulsion support body that is sequentially connected to the rear of the lead conductor, the continuous buried pipe is manufactured from the buried pipe material, and the continuous buried pipe is continuously fed into the buried hole. However, it is possible to reliably propel the lead conductor, the propulsion support, and the continuous buried pipe. Moreover, by holding and fixing the continuous buried pipe on the propulsion support, it is possible to hold and fix the continuous buried pipe at a plurality of holding and fixing points, and disperse the propulsive force applied to the buried pipe to localize the buried pipe. It is possible to prevent excessive stress from being generated, and to prevent the embedded pipe from being deformed or damaged during propulsion construction.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a construction state showing an embodiment of the present invention, FIG. 2 is a perspective view showing a manufacturing portion of a continuous buried pipe, and FIG.
FIG. 4 is a partially cutaway sectional view showing details of a connecting portion of a propelling support and an expansion mechanism, and FIG. 4 is a perspective view showing a manufacturing portion of a continuous buried pipe in another embodiment. 10 ... Lead conductor, 20 ... Propulsion support, 50 ... Expansion mechanism (holding and fixing means), 60 ... Continuous buried pipe, 62 ... Buried pipe material, 7
1,72 ... Bending roll, 76 ... Cylindrical processing equipment

Claims (2)

[Claims] 1. A long strip-shaped buried pipe material made of a plastic material in a buried pipe propulsion method in which a leading conductor is propelled in the ground to form a buried hole, and a buried pipe is driven and buried in the buried hole. While continuously bending and molding the continuous buried pipe by joining the side edges, the continuous buried pipe is continuously inserted into the buried hole and propelled. Construction method. 2. A continuous buried pipe is fitted and inserted into the outer periphery of a propulsion support body which is sequentially connected to the rear of the lead conductor, and the continuous buried pipe is held and fixed to the propulsion support body, and the propulsive force is applied from the propulsion support body to the continuous buried pipe. The method for propelling a buried pipe according to claim 1, wherein "