JPH0254095A - Laying changing construction for ready-set pipe - Google Patents

Abstract

PURPOSE:To eliminate an influence upon an embedded pipe by connecting newly set pipes to pilot pipes in order to be fed, after the pilot pipes with fitted cutting edges are inserted through the outer periphery of a rod with the guide of the auger rod. CONSTITUTION:In a ready-set pipe 2, from an advancing vertical pit 22 to a reaching vertical pit 23, an auger rod is rotated and is fed, and an pipe interior is cleaned. After that, a pilot pipe 18b with a cutting edge 18a fitted at the tip is inserted through the rod 17, and the rod 17 is rotated with a drill head 21, and at the same time, the pipe 18b is rotated and is fed with a drill head 20, and the pipe 2 is crushed with the cutting edge 18a. After that, when the cutting edge 18a reaches the vertical pit 23, then the cutting edge 18a is removed, and the rod 17 is pulled out. Then, to the pipe 18b, a newly set pipe 3 is connected one after another and is fed with the head 20, and the pipe 18b is converted to the pipe 3. Accordingly, without damaging embedded pipes or the like near said pipes, the pipe 18b can be changed to the new pipe to be laid.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a method for replacing existing pipes such as ceramic pipes and humid pipes buried underground with new pipes without excavating from the ground. It is related to construction methods.

[Prior Art] As shown in Fig. 4, a conventional method for replacing existing pipes involves laying pipes at the rear end of an excavator 1, which has a body portion 1a with a tapered tip and a larger outer diameter than the existing pipe 2. A new pipe 3 to be replaced is installed, a jack is used to apply pressure force forward from a starting shaft (not shown), and while the excavator 1 is pulled from the front by a cable 4 such as a wire lobe, it is sent from the rear via an air hose 5. The air hammer inside the excavator 1 is actuated by the pressurized air, and the excavator 1 and the newly installed pipe 3 move forward together, and the excavator 1
A method is disclosed in which a part of the taper at the tip of the pipe enters into the existing pipe, crushing it and expanding the gap outward to replace the existing pipe 3 with the new pipe 2. In this case, the taper portion 1b is provided with a cutting blade IC that expands radially outward from the outer periphery, and this is expanded by hydraulic pressure or the like to effectively crush the wall of the existing pipe. ing.

Further, as shown in FIG. 5, a glans-shaped water intake device 12 matching the inner diameter of the existing pipe 2 is connected to the front of the excavator main body 1), and the excavator main body 1) has a spoke-shaped cutter 1 on the front. ) is driven to rotate, and the existing pipe crushed by the spoke-shaped cutter 1) a and the surrounding earth and sand are crushed by a crusher built into the excavator body 1) and discharged to the rear. A newly installed pipe 3, which is biased forward by a pressing force by a jack in the starting shaft, approaches the rear end of the excavator main body 1) and is fed. If the existing pipe is a sewage pipe, the sewage that entered the water intake device 12 from the head of the water intake device 12 passes through the connecting pipe 13, passes through the excavator body 1), and then enters the starting shaft from the sewage pipe 14. A pump sends it to the ground. Also, spoke type cutter 1)
The existing pipe 2 and earth and sand crushed by the rotation of a are transferred to the mud water pipe 1.
It is mixed with the muddy water sent into the excavator main body 11 in step 5, and is discharged to the ground by a pump through a mud discharge pipe 16.

[Problems to be Solved by the Invention] However, the conventional method of replacing existing pipes using an excavator as shown in FIG. Since this is a method of press-fitting new pipes, the gas pipes buried nearby during consolidation,
There is a risk of damaging buried cable pipes, etc., and since the earth and sand surrounding the new pipe is consolidated, there is a drawback that the new pipe can only be replaced with a diameter smaller than the existing pipe.

Next, in the method of replacing existing pipes using a conventional excavator shown in Fig. 5, if the existing pipe is a pipe with reinforcing bars such as a Huyum pipe, the reinforcing bars are removed by the spoke-shaped cutter 1 as the excavator advances.
) If it wraps around a and solidifies forward, or even if it passes through there, there is a risk of damaging the crusher blade, and furthermore, it is difficult to pass through the mud removal pipe 16 or the pump (not shown), so the existing pipe The drawback is that it can only be applied to ceramic pipes that do not contain reinforcing bars.

The present invention has been made in view of the above-mentioned circumstances.

[Means for Solving the Problems] The method for re-laying existing pipes of the present invention rotates and feeds an auger rod into the existing pipe from a starting shaft, and after the tip of the auger rod penetrates into the reaching shaft, A rod of a predetermined length is connected to the base end of the auger rod, and a pilot tube of a predetermined length attached to the tip of the cutting edge that cuts the end of the existing pipe is inserted into the outer periphery of the rod to form a set, and the auger rod is started. While rotating on the shaft side, the pilot pipe is rotated and fed from the starting shaft side separately from the auger rod, the existing pipe is crushed with a cutting edge at the tip of the pilot pipe, and the one set is fed. After that, the rod is removed, and a pilot pipe is inserted into the outer periphery of the rod to form one set, and the sets are sequentially connected from the starting shaft side, and the pilot pipe is rotated and fed while rotating the auger rod, After the cutting edge reaches the reaching shaft, the cutting edge is removed at the reaching shaft, and then the auger rod is pulled out toward the starting shaft and removed,
Next, a new pipe is connected to the pilot pipe from the starting shaft side, and the pilot pipes are sequentially fed, and the pilot pipes that appear in the arrival shaft are sequentially collected, thereby replacing all the pilot pipes with the new pipe. and rotating and feeding an auger rod from the reaching shaft into the existing pipe, and after the tip of the auger rod penetrates into the starting shaft, the auger rod is rotated from the reaching shaft and the end face of the existing pipe is inserted from the starting shaft side. A pilot pipe with a cutting edge attached to the tip is rotated and fed, the existing pipe is crushed with the cutting edge, and after the cutting edge reaches the reaching shaft, the cutting edge and the base of the auger rod are separated from each other in the reaching shaft. Remove the one on the end side, then pull out the auger rods one by one to the arrival shaft and collect them, connect the new pipes to the pilot pipe from the starting shaft side and feed them one by one, and sequentially feed the pilot pipes that appeared in the arrival shaft. By recovering the pilot pipe, all of the pilot pipes are replaced with new pipes.

[Operation] Until the cutting tip is attached, the inside of the existing pipe is cleaned by the spiral blade of the auger rod, and the contents inside the pipe are discharged to the starting shaft side or the destination shaft side. In addition, the auger rod serves as a guide to rotate and advance the cutting edge, and the crushed fragments of the existing pipe and the earth and sand around the cutting edge are discharged to the destination (reaching shaft) through the existing pipe using the spiral blades of the auger rod. be done. Further, when the existing pipe is a hump pipe or the like, the reinforcing steel is wound around the auger shaft along the spiral blade of the auger rod, and the auger rod rotates in this state.

[Example] Hereinafter, an example of the present invention will be described in detail based on the accompanying drawings.

FIGS. 1(a) to 1(f) are process diagrams showing an embodiment of the first aspect of the method for replacing existing pipes of the present invention.

First, as shown in FIG. 1(a), the auger rod 17 is rotated and fed into the existing pipe 2 from the starting shaft 22 to the reaching shaft 23. At this time, the auger rods 17 having a predetermined length are successively added in the starting shaft 22.

Next, when the tip of the auger rod 17 reaches the reaching shaft, a rod 17c of a predetermined length is connected to the base end of the auger rod 17, and a cutting edge 18a for cutting the end surface of the existing pipe is attached to the tip of the rod 17c on the outer periphery. The installed pilot pipes 18b of a predetermined length are inserted into one set, and while the auger rod 17 is rotated by the drill head 21 on the starting shaft side, the pilot pipe 18b is rotated and fed by the drill head 20, The existing pipe is crushed by the cutting edge 18a, and the one set is fed. FIG. 1(b) and FIG. 1(c) show a state in which the pilot pipes 18b are sequentially added and rotated and fed after feeding the one group, and after feeding the one group, As shown in FIG. 1(c), the drill head 20 is moved back, the rod 17c is removed, and one new pilot pipe 18b is inserted into the outer periphery of the rod 17c to form a set.
This is connected between the drill head 20 and the drill rod 17 and the pilot pipe 18b, the end of which looks into the starting shaft 22, and while the drill rod 17 is being rotated, the pilot pipe 18b is rotated and fed. By repeating this operation, when the cutting edge 18a reaches the reaching shaft 23 as shown in FIG. 1(d), the cutting edge 18a is removed from the reaching shaft (FIG. 1(e)). As shown in Figure (e), the rod 17a and the auger rod 17 are pulled out toward the starting shaft and removed. Next, as shown in FIG. 1(f), a new pipe 3 is installed from the starting shaft 22 side to the pilot pipe 18b.
are sequentially connected and fed by the drill head 20, the pilot pipes 18b appearing in the reaching shaft are sequentially collected, and all the pilot pipes 18b are replaced with the newly installed pipes 3.

In FIG. 1(f), 18c is a joint that connects the pilot pipe 18b and the newly installed pipe 3.

FIGS. 2(a) to 2(f) are process diagrams showing an embodiment of the second aspect of the method for replacing existing pipes of the present invention.

The difference from the method of the first claim is that (1) the auger rod 17 is rotated and fed toward the starting shaft 22 by the drill head 21 installed in the reaching shaft 23;
It is not necessary to attach or detach the rod 17C shown in a), ■ To crush and feed the existing pipe 2 using the pilot pipe 18b, simply add the pilot pipe 18b on the starting shaft side. ■ Furthermore, to remove the auger rod 17, Next, to explain according to the diagram, the auger rod 17 is rotated and fed toward the starting shaft 22 with the drill head 21 on the reaching shaft 23 side (Fig. 2(a)). , the pilot pipe 18b with the cutting edge 18a attached to its tip is rotated and fed by the drill head 20 from the starting shaft 22 (Fig. 2(b)).
In this case, the pilot pipes 18b are sequentially connected on the starting shaft 22 side (Fig. 2(C)).
When the feeding of b is completed (Fig. 2 (d)), the reaching shaft 23
Remove the cutting edge 18a on the side, pull out the auger rod 17 toward the reaching shaft 23 side, and collect it one by one (Fig. 2 (e))
. Next, the newly installed pipes 3 are sequentially added and fed from the start shaft 22 side, and the pilot pipe 18b is recovered at the arrival shaft 23 (FIG. 2(f)).

In FIG. 2(f), 18c is a joint that connects the pilot pipe 18b and the newly installed pipe 3.

When the tip of the new pipe 3 is seen on the reaching shaft 23 side, the replacement of the existing pipe 2 with the new pipe 3 is completed.

In addition, as shown in FIG. 3, in the case of FIG. 1 in the method of replacing existing pipes of the present invention, if this is applied, for example, to replacing sewer pipes, it will be possible to Existing pipes can be replaced with new pipes. To explain this using the diagram below, the replacement section is where wastewater is transferred to the auger rod 1.
7. Since the rod 17c can be passed through, the inside of the arrival shaft 23 is connected to the vibrator 26a inserted into the backer 26 in the end of the existing pipe through the water swivel 25, and the waste water is passed through the inside of the starting shaft 22. The hose 29 passes through the hollow shaft 28a of the drilling machine 28, and is connected to the submersible pump 30a inserted into the water bag 3o via the water swivel 29.
Connect with a. Sewage flowing into the water bag 30 from the new pipe 3 passes through the rod 17C and the auger rod 17 by the submersible pump 30a, and is pumped into the existing pipe 2. Therefore, the sewer pipe can be used while the existing pipe 2 is being crushed and the cutting edge 18a is being fed.

Furthermore, during the connection of the pilot pipe 18b shown in FIG. 1(C),
During the auger rod 17 recovery and the first
During the connection of the newly installed pipe 3 shown in FIG. Allow sewage to pass through.

In addition, in FIG. 3, the existing pipe 2 may be a newly installed pipe, and the newly installed pipe 3 may be an existing pipe.

[Effects of the Invention] As explained above, the method for replacing existing pipes of the present invention provides the following effects.

(2) Compared to the conventional construction method shown in FIG. 4, the present invention has no risk of damaging nearby gas pipes, buried cable pipes, etc. Further, the method according to the first aspect of the present invention can be carried out even when the pipe is in use.

■ Compared to the conventional construction method shown in Fig. 5, when crushing an existing pipe containing reinforcing bars such as a humid pipe, the reinforcing bars are gradually moved along the spiral blades from near the tip of the blade at the base end of the auger rod. However, the spiral blades of the auger rod 17 are continuous from the starting shaft to the reaching shaft, and the reinforcing bars are wrapped along the spiral blades without clumping together on the way, so the auger rod's spiral blades are continuous from the starting shaft to the reaching shaft. It can be removed during recovery, and even existing pipes with reinforcing bars can be replaced. Furthermore, the structure is simple because there is no built-in crusher, prime mover, etc. inside the excavator. Furthermore, if the crusher or prime mover inside the excavator breaks down during construction, it would be difficult to repair it with conventional models, but according to the construction method of the present invention, the machine for rotation and feeding is located inside the shaft, so repair is easy. Furthermore, the frequency of failures is low, which increases work efficiency. Furthermore, since the construction method of the present invention is a dry method that does not use water, no pumps are required and there is no pollution caused by mud.

[Brief explanation of the drawing]

1(a) to 1(f) are process diagrams showing an embodiment of the first claim of the method for re-laying existing pipes of the present invention, and FIG. 2(a)
~(f) is a process diagram showing an embodiment of the second claim of the method for replacing existing pipes of the present invention, and FIG. 3 outlines the case where the method of the present invention is constructed while the pipe is in use. Floor plan, 4th
FIG. 5 is an explanatory diagram showing a conventional construction method. 2...Existing pipe, 3...New pipe, 17...Auger rod, 17c...Rod, 18a...Blade mouth, 18b...
Pilot pipe, 22... Starting shaft, 23... Arrival shaft. Patent applicant: Nippon Steel Pipe Works Co., Ltd. Koken Kogyo Co., Ltd.

Claims (2)

[Claims] (1) Rotate the auger rod from the starting shaft into the existing pipe.
After the tip of the auger rod penetrates the reaching shaft, a rod of a predetermined length is connected to the base end of the auger rod, and a pilot of a predetermined length is attached to the tip of the auger rod with a cutting edge for cutting the end surface of the existing pipe. A tube is inserted into the outer periphery of the rod to form a set, and while the auger rod is rotated on the starting shaft side,
The pilot pipe is rotated and fed from the starting shaft side separately from the auger rod, the existing pipe is crushed with a cutting edge at the tip of the pilot pipe, and after feeding the one set, the rod is removed. At the same time, a pilot pipe is inserted into the outer periphery of the rod to form one set, and the sets are sequentially connected from the starting shaft side, and the pilot pipe is rotated and fed while the auger rod is rotated, so that the blade opening reaches the reaching shaft. After reaching the destination, remove the blade in the reaching shaft, then pull out the auger rod to the starting shaft side and remove it, then connect a newly installed pipe to the pilot pipe from the starting shaft side and sequentially feed it to the reaching shaft. 1. A method for replacing existing pipes, characterized in that all pilot pipes are replaced with new pipes by sequentially collecting the pilot pipes that have appeared. (2) Rotate the auger rod from the reaching shaft into the existing pipe.
After the tip of the auger rod penetrates the starting shaft, the auger rod is rotated from the reaching shaft, and the pilot pipe, which is equipped with a cutting edge for cutting the end face of the existing pipe from the starting shaft side, is rotated and fed. advance and crush the existing pipe with the cutting edge, and after the cutting edge reaches the reaching shaft, remove the cutting edge and one of the proximal auger rods in the reaching shaft, and then sequentially remove the auger rod. The pilot pipes are all replaced with new pipes by pulling them out to the reaching shaft and collecting them, connecting new pipes to the pilot pipes from the starting shaft side and sequentially feeding them, and sequentially collecting the pilot pipes that appear in the reaching shaft. A method for replacing existing pipes.