JPH0694163A - Drawing-in construction method for main pipe into propelling pipe - Google Patents

Abstract

PURPOSE:To improve work efficiency for the drawing-in of a main pipe by depositing invert concrete in a lower part inside a propelling pipe passing through a space between shafts in the earth, and painting a skid paint on the surface of the concrete, and then drawing the main pipe such as a gas pipe or the like by a drawing device including a duplex block through a wire. CONSTITUTION:After a space between a start shaft 1 and an arrival shaft 2 is passed through by a propelling pipe 3 composed of a steel pipe and a Hume pipe or the like, invert concrete 5 is deposited in the lower part of the propelling pipe 3, and a skid paint including epoxy resin is painted on the surface of the concrete 5 to form a filmed layer 6 having low coefficient of friction. The drawing-in process of a main pipe 4 is then begun, and in this case, the main pipes 4 are welded in order in the start shaft 1 and mutually connected, and drawn in order and moved by a drawing device 8 installed in the arrival shaft 2. The drawing device 8 has a winch 9 and a duplex pulley 10 formed of a steady pulley 11 and a movable pulley 13, and draws the main pipe 4 as the tip position of a main wire 16 is successively changed by a quick stopper 14 connected to the movable pulley 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a main pipe retraction method for propelling a main pipe such as a gas pipe into a propulsion pipe, and more particularly to facilitating long-distance retraction.

[0002]

2. Description of the Related Art In laying gas pipes, sewer pipes, etc., the open-cut construction method has become difficult in recent years particularly due to traffic conditions and construction pollution. For this reason, for example, when laying a gas pipe, a propulsion pipe consisting of a steel pipe, a Hume pipe, etc. is propelled between the starting vertical shaft and the reaching vertical shaft, and the main pipe is connected by welding at the starting vertical shaft while reaching it. The tip conduit fixed to the tip of the main pipe in the vertical shaft is pulled by a wire and drawn into the propulsion pipe. When pulling this main pipe into the propulsion pipe, an invert concrete is placed in the lower part of the propulsion pipe, and a polyethylene sheet is laid on the surface of the invert concrete,
Oil is applied to the polyethylene sheet directly or on the polyethylene sheet, and the piping smoother fixed to the main pipe at predetermined intervals is slid to move.

[0003]

However, when the polyethylene sheet is spread over the invert concrete, it is attached to the invert concrete with an adhesive or a nail, but the attachment is not easy. . Further, the adhesion between the surface of the invert concrete and the polyethylene sheet is poor, and it is difficult to spread the polyethylene sheet on the invert concrete without a gap, which requires time for construction.

Further, since the polyethylene sheet has low strength, if many piping smoothers are slid in and pulled in on the polyethylene sheet for laying over a long distance, the polyethylene sheet may be cracked or broken. Friction resistance increases due to cracking, turning, etc. Further, since the main pipe is drawn into the propulsion pipe while winding the thick wire with the winch, the length of the wire is limited by the capacity of the winch winding cylinder. For this reason, it is difficult to pull the main pipe into a long distance, and the maximum length of the main pipe is about 100 m.

The present invention has been made in order to solve the above disadvantages, and an object thereof is to provide a main pipe retraction method for propulsion pipes in which the retraction length of the main pipe can be increased and the main pipe can be easily retracted. To do.

[0006]

According to the method for pulling in a main pipe in a propulsion pipe according to the present invention, an invert concrete is placed in the lower portion of the propulsion pipe penetrating between the vertical shafts, and the surface of the invert concrete is formed. To the traction device having a winch and a compound pulley connected to the winch, with a quick stopper connected to the compound pulley of the compound pulley, Inside the propulsion pipe while connecting while changing the position of the tip of the main wire, pulling the moving pulley and sliding the main pipe attached to the leading pipe connected to the other end of the main wire over the lubricant coating. It is characterized by pulling in.

It is preferable that the main wire and the leading conduit are connected by a universal joint, and a roller is provided on the lower surface of the tip of the leading conduit.

[0008]

According to the present invention, the lubricant coating is applied to the surface of the invert concrete placed in the lower portion of the propulsion pipe penetrating between the vertical shafts to apply the invert concrete.
To reduce the friction coefficient of the surface of the grate. Since this lubricant coating material has a good adhesiveness and contains an epoxy resin having a high strength, it can be easily applied to the surface of the invert concrete and the abrasion resistance is enhanced.

After inserting the main wire into the propulsion pipe, the position of the tip of the main wire is fixed by a quick stopper connected to a moving pulley of a traction device having a winch and a compound pulley connected to the winch to move the winch. Pull the pulley and pull in the main pipe connected to the main wire by the lift amount of the double pulley.
After that, the connection between the main wire and the quick stopper is released, the position of the movable pulley is returned, the quick stopper is fixed again at a different position of the main wire, and the main pipe is pulled in by a predetermined distance. By repeating this operation in sequence, the main pipe is drawn into the propulsion pipe only by winding a small amount of wire around the winch.

The main wire and the leading conduit are connected by a universal joint, and a roller is provided on the lower surface of the leading end of the leading conduit to prevent twisting or downward force generated in the main wire when the main pipe is pulled in for a long distance. Eliminate the impact

[0011]

1 is a sectional view showing an embodiment of the present invention. As shown in the figure, a propulsion pipe 3 made of a steel pipe, a Hume pipe or the like is propelled between the starting shaft 1 and the reaching shaft 2. When pulling the main pipe 4 into the propulsion pipe 3, first, as shown in the transverse sectional view of FIG.
Invert concrete 5 is placed and invert concrete 5 is placed.
A lubricant coating material containing an epoxy resin is applied to the surface of to form the coating layer 6 having a low friction coefficient. This Invert Concrete
The cover 5 and the coating layer 6 are attached to the main pipe 4 at regular intervals and are for moving the main pipe 4 by sliding and moving a piping summer 7 having a plurality of protruding sliding surfaces 7a. Is. Since the coating layer 6 is formed of a lubricant coating material containing an epoxy resin having good adhesiveness, it can be applied to the surface of the invert concrete 5 easily and uniformly. Further, since the epoxy resin contained in the lubricant coating material has high adhesive strength and mechanical strength, the coating layer 6
Can be reliably adhered to the surface of the invert concrete 5, and the abrasion resistance of the surface of the coating layer 6 can be enhanced. Therefore, the coating layer 6 is not peeled off by sliding the piping smoother 7 repeatedly, and the piping smoother 7 is not peeled off.
Can be slipped stably.

After the invert concrete 5 is cast to form the coating layer 6, the main pipe 4 is drawn in. In the drawing process of the main pipe 4, the main pipes 4 are sequentially connected by welding in the starting vertical shaft 1, and the main pipe 4 is moved by the traction device 8 installed in the reaching vertical shaft 2. As shown in FIG. 3, the towing device 8 has a winch 9, a compound pulley 10 including a constant pulley 11 and a moving pulley 13 mounted on a carriage 12, and a quick stopper 14. The winch 9 winds the auxiliary wire 15 wound around the compound pulley 10 and moves the moving pulley 13. The quick stopper 14 is for fixing the main wire 16 for pulling in the main pipe 4 by penetrating the main wire 16, and is connected to the moving pulley 13 by a wire 17.

When pulling the main pipe 4 into the propulsion pipe 3 by the pulling device 8, first, the main wire 16 is inserted into the propulsion pipe 3. Next, as shown in FIG.
The tip conduit 18 is welded to the tip of the
6 and 6 are connected by a freely rotatable sieve mechanism 19. After that, the piping summer 7 is attached to the main pipe 4 and the leading conduit 18 at a constant interval. When this piping smoother 7 is attached, a plurality of piping smoothers 7 having sliding surfaces 7a staggered are attached to the tip conduit 18. Further, a rotatable roller 20 is attached to the lower portion of the tip of the leading conduit 18.

On the other hand, in the reaching shaft 2, the main wire 16 is passed through the quick stopper 14 and fixed, and the main wire 16 and the moving pulley 13 are connected. Then, the winch 9 is operated to wind up the auxiliary wire 15 wound around the fixed pulley 11 and the moving pulley 13. By winding the auxiliary wire 15, the moving pulley 13 mounted on the carriage 12 moves toward the constant pulley 11. Due to the movement of the movable pulley 13, the main wire 16 fixed by the quick stopper 14 is pulled, the main pipe 4 connected to the end of the main wire 16 is drawn into the propulsion pipe 3, and the leading conduit 18 and the main pipe 4 are connected. The main pipe 4 is moved while sliding the piping summature 7 attached to the coating layer 6 on the coating layer 6. After moving the main pipe 4 by the unit length, the fixing of the main wire 16 by the quick stopper 14 is released. Then, the quick stopper 14 and the moving pulley 13 are moved in the direction opposite to the constant pulley 11 by a distance corresponding to the unit length of the main pipe 4, and the main wire 16 is fixed to the quick stopper 14 again at that position.
Then, after the main pipe 4 is welded and connected on the side of the starting shaft 1, the winch 9 is operated to move the main pipe 4 by a unit length. By repeating this operation, the main pipe 4 is sequentially moved by the winch 9 having a small winding cylinder, and the propulsion pipe 3 having a long distance is moved.
The main tube 4 can be easily pulled in.

When the main pipe 4 having this weight is pulled in over a long distance, the weight of the main pipe 4 pulled in becomes very large.
For this reason, the main wire 16 needs to have a large outer diameter, for example, 47.5 mm. The weight of the main wire 16 causes a slack in the main wire 16 and a downward force acts on the leading conduit 18. For this reason, the tip portion of the leading conduit 18 comes to rub against the coating layer 6, and the frictional resistance at the time of withdrawal increases. So there is a conduit 1
A rotatable roller 20 is provided at the tip of 8 to prevent an increase in frictional resistance when retracted.

Further, the leading conduit 18 and the main conduit 4 are connected to the main wire 16
When pulling a long distance with, the main wire 16 is inevitably twisted. If the twist of the main wire 16 directly acts on the leading conduit 18, there is a risk that the leading conduit 18 may cause a swinging phenomenon. Therefore, a rotatable swivel mechanism 19 is provided between the front conduit 18 and the main wire 16, and the front conduit 18 due to the twist of the main wire 16 suppresses the swinging phenomenon. This sea
Even if the bell mechanism 19 is provided, a force perpendicular to the traction force acts on the front conduit 18 when pulling in a long distance, so that the front conduit 1
There is a risk that 8 rolls laterally. If the tip conduit 18 rolls and its tip hits the propulsion pipe 3, it cannot be retracted. Therefore, a plurality of piping summers 7 having sliding surfaces 7a staggered are attached to the leading conduit 18
It prevents it from rolling laterally.

As described above, as a result of actually pulling the main pipe 4 into the propulsion pipe 3 while sliding it on the coating layer 6 having a high strength by the pulling device 8, in the past, only about 100 m can be pulled in. The pull-in length could be more than 300m. For this reason, the number of vertical shafts can be reduced by at least two from the conventional one, and the construction efficiency can be improved and the influence of traffic obstacles and pollution can be greatly reduced.

[0018]

As described above, according to the present invention, the lubricant coating is applied to the surface of the invert concrete placed in the lower part of the propulsion pipe penetrating between the vertical shafts to apply the invert concrete. To reduce the friction coefficient of the surface. Since this lubricant coating material has good adhesiveness and contains an epoxy resin having high strength, it can be easily applied to the surface of the invert concrete, and at the same time, it can be improved in abrasion resistance, and the main pipe can be made long. The pretreatment time can be shortened and the main pipe can be reliably pulled in when it is pulled into the propulsion pipe at a distance.

When pulling the main pipe into the propulsion pipe, after inserting the main wire, one position of the main wire is connected by a quick stopper connected to a moving pulley of a traction device having a winch and a compound pulley connected to the winch. Since the main pulley connected to the main wire is pulled in order by pulling the moving pulley with the winch and pulling the lift of the compound pulley, the main wire can be pulled into the propulsion pipe by winding the few wires into the winch. You can use a winch with a small winding cylinder to pull in long distances.

Further, the main wire and the leading conduit are connected by a flexible joint, and a roller is provided on the lower surface of the leading end of the leading conduit so that the main wire is twisted and the downward force is exerted when the main pipe is pulled in for a long distance. It is possible to remove the influence of the above, and to stably pull in the main pipe.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the propulsion pipe of the above embodiment.

FIG. 3 is a configuration diagram of a towing device.

FIG. 4 is a configuration diagram showing a connecting portion between a main pipe and a main wire.

[Explanation of symbols]

 1 Starting shaft 2 Arrival shaft 3 Propulsion pipe 4 Main pipe 5 Invert concrete 6 Coating layer 7 Piping smoother 8 Traction device 9 Winch 10 Compound pulley 11 Fixed pulley 13 Moving pulley 14 Quick stopper 15 Auxiliary wire 16 Main wire

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroya Kishino 15-10 Miyamatsucho, Hiratsuka-shi, Kanagawa Hiratsuka Apt 607 (72) Inventor Naoyuki Masuda 1-2, Marunouchi, Chiyoda-ku, Tokyo Nihon (72) Inventor Masaru Hagiwara 1-4-10 Nishikubo, Musashino City, Tokyo (72) Inventor Kazuhiro Mizuno 1-4-26-111 Kashiori-cho, Asaka-shi, Saitama Prefecture

Claims (2)

[Claims] 1. An invert concrete is placed in a lower portion of a propulsion pipe penetrating between vertical shafts, a lubricant coating material containing an epoxy resin is applied to the surface of the invert concrete, and the inside of the propulsion pipe is provided. Insert the main wire and connect it to a traction device that has a winch and a compound pulley connected to the winch while sequentially changing the position of the tip of the main wire with a quick stopper that is connected to the compound pulley of the compound pulley. A main pipe retraction method in a propulsion pipe, characterized in that the main pipe attached to a leading pipe connected to the other end of the main wire is pulled into the propulsion pipe while sliding on the lubricant paint. 2. The main pipe retraction method for a propulsion pipe according to claim 1, wherein the main wire and the leading conduit are connected by a universal joint, and a roller is provided on the lower surface of the tip of the leading conduit.