JPS61290126A - Protection work for inner wall of existing pipeline - Google Patents

Abstract

PURPOSE:To make the renewal of existing pipelines easier by a method in which a powdery hardening agent is sprayed from the jet part of a coating head onto the inner wall of an existing pipeline and heated to bond it to the inner wall to form new inner wall. CONSTITUTION:A connecting shaft 7 attached with an excavating head 8 is penetrated into an existing pipeline 3 by operation of the shaft of the cyclone decelerator 5 of a driver 4 and also by operation of a propeller to excavate the inner wall of the pipeline 3. When the excavation of the inner wall of the pipeline 3 for one-stroke of the decelerator 5 by the head 8 is ended, the rear end of the shaft 7 is attached to the shaft and the inside of the pipeline 3 is likewise excavated. When the head 8 reaches from a manhole 2 to a manhole 2', the head 8 and the shaft 7 are drawn out of the pipeline 3, and a coating head 11 is inserted into the hole 10. A hardening agent is sprayed from the head 11 onto the inner wall of the pipeline 3 while the head 11 is dragged from the manhole 2 to the manhole 2' and heated to bond it to the inner wall to form new wall 23.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is intended to renew existing conduits mainly for wiring underground cables, etc., which are constructed using centrifugal reinforced concrete pipes (hereinafter simply referred to as Huyum pipes). This relates to a construction method for replacing pipes with pipes.

(Prior art) Normally, when wiring electric wires, telephone lines, etc. underground across roads and buildings, an appropriate number of manholes are installed underground along the wiring direction, and the manholes are installed underground along the wiring direction. and the manhole are connected by a conduit such as a hump pipe, and the electric wire 5 is inserted into the conduit.
Gas pipes, etc. were installed. However, the existing conduit may become obsolete, a collapsed part may appear on its inner wall, trouble may occur with the underground cable wired within the conduit, or a new line may be installed within the conduit. If the capacity of the pipeline became insufficient, the only option was to replace it with a new pipeline.

(Problem to be Solved by the Invention) However, the conventional method of replacing the existing pipe with a new pipe is to excavate the ground from the ground surface to the buried location of the existing pipe, and then replace the pipe with a new pipe. After the replacement, the excavated portion had to be backfilled, which took more time and effort than necessary, making the work cost extremely high.

(Means and effects for solving the problem) The present invention has been made in order to eliminate the drawbacks of the above-mentioned conventional method of replacing existing pipes with new pipes, and provides When the existing pipeline installed with VJt becomes obsolete and needs to be replaced, the pipeline can be left as is,
If necessary, the inner periphery of the pipe is cut to an appropriate size using a rotary cutting head, etc. to create a hole for the new pipe in the existing pipe, and the inside of the hole in the pipe is hardened. To spray the agent, the coating head, which is equipped with a curing agent and a heater, is connected to a high-pressure hose for pumping the curing agent and an electric wire for heating the heater, and is pulled from one manhole to the other using a traction wire or the like. During this process, the hardening agent is sprayed from the coating head by using the high-pressure hose to pump the hardening agent provided in powder form into the coating head, and spraying the hardening agent from the part to the inner circumferential wall of the through hole. At the same time, the hardening agent sprayed onto the inner peripheral wall of the through hole is heated by the heater of the coating head and welded to the inner peripheral wall of the through hole. It was designed to form and move forward.

(Example) The present invention will be described in detail below based on an example shown in the drawings.

FIG. 1 is a schematic side view showing an embodiment of the method of protecting the inner wall of an existing pipeline according to the present invention. In this case, first, the inner wall is excavated and enlarged, and then the present invention is implemented.

In the figure, the existing pipe 3 installed between manholes 2 and 2' in underground 1 is composed of a humid pipe, and the pipe 3 is already severely deteriorated and needs to be replaced. do. At this time, the worker of the relevant construction must first
Remove all the underground cables etc. that were wired inside the manhole, and then insert the underframe 4 into one of the manholes 2 and 2', and slide the underframe 4 back and forth in the longitudinal direction in the figure. A drive device 6 configured with a cyclone reducer 5 is disposed,
After attaching the connecting shaft 7 to the shaft of the cyclone reducer 5 of the drive device 6, attaching the cutting head 8 to the tip of the connecting shaft 7, and attaching the center ring bearing 9 to the appropriate position in the middle thereof. , by rotating this using the cyclone reducer 5 and sliding the cyclone reducer 5 into the introduction part of the existing pipe 3 using a propulsion device (not shown). The circumference is cut to an appropriate size to create a through hole 10 for the new conduit. When the slide of the cyclone reducer 5 in the direction of the existing pipeline 3 is completed in one stroke, the shaft of the reducer 5 is removed from the connecting shaft 7, slid on the underframe 4 and returned to its original position, and then After connecting the tip of the next connecting shaft 7 to the rear of the connecting shaft 7 using the universal joint 11, the rear end of the connecting shaft 7 is attached to the shaft of the cyclone reducer 5, and then connected again. It is rotated and pushed into the existing pipe line 3.

After repeating the above operation a necessary number of times, when the tip of the connecting shaft 6 reaches from one manhole 2, the cutting head 8,
The connecting shafts 7 connected to the rear of the heads are extracted from the manhole 2' side through the through-holes 10 for the interior walls of the existing pipe 3 (next, the present invention When removing the cutting head 8 and the plurality of connecting shafts 7 connected to the rear from the other manhole 2', a traction wire or the like is attached to the rear end of the connecting shaft 7. Attach the tips of a high-pressure hose for pumping the curing agent and an electric wire for heating the heater, and connect these towing wires, high-pressure hoses, electric wires, etc. to the cutting head 8 and the connecting shaft 7 through the manhole 2. When all of the pipes are removed from the through hole 10 for the new pipe on the ' side, the new pipe is placed in the through hole 10 for the new pipe, and then the new pipe is removed from the manhole 2 side. A coating head 11 is inserted into the through-hole 10, and the traction wire, high-pressure hose, electric wire, etc. are attached to the tip thereof, and the members necessary for coating, which will be described later, are connected and inserted into the rear end. As shown in FIG. 2, the coating head 11 is provided with rollers 13...
A suitable number of bearings 14 are installed using bearings 14, and a fitting 16 such as a traction wire 15 is provided at a suitable position on the tip of the outer periphery of the main body 12, and an electric wire is installed at a suitable position in the middle. 17, a socket 20 for coupling the high pressure hose 19 is installed at the tip of the main body 12, and a heater 21 is integrally installed at the rear end. 21 is connected to the connector 18 of the electric wire 17, and furthermore, a curing agent spraying part 22 is provided on the outer periphery of the main body part 12 in front of the heater 2I by making a number of small holes. When the coating head 11 is towed from one manhole 2 to the other manhole 2' using a towing machine (not shown) using the towing wire 15, etc. A curing agent such as powdered Styrofoam is press-fitted into the main body 12 of the coating head 11 via the high-pressure hose 19 from a curing agent supply device (not shown) using compressed air from an air pump or the like, and the curing agent is cured. The curing agent is sprayed onto the inner peripheral wall of the through hole 10 from the small hole in the part 22, and the curing agent is heated by the heater 21 to be welded to the inner peripheral wall of the through hole 10, as shown in FIG. Then, an inner wall 23 of an appropriate thickness is formed on the inner circumferential wall of the existing pipe line 3 using the hardening agent.

(Effects of the Invention) The present invention provides the existing pipe 3 using the Huum pipe as described above.
Since the internal wall 23 is formed using a hardening agent, the ground where the pipe 3 is buried must be dug up, unlike the conventional method of replacing the existing pipe 3 with a new pipe. Since there is no need to replace the pipeline and then backfill the excavated ground, this helps to shorten the construction period and reduce construction costs. In addition, when forming the interior wall 23 using a hardening agent on the inner circumference of the existing pipe 3, a powdered hardening agent is used, and the hardening agent is transported to a target position within the old pipe 10. The method uses compressed air from an air pump or the like and a high-pressure hose 19, and the method for welding the hardening agent to the inner circumferential wall of the old pipe line at the desired location requires part 2 to spray the hardening agent at the appropriate location.
2 and a heater 21
1, and while the coating head 11 is being towed from one manhole 2 to the other manhole 2' in the old pipe using a pulling wire 15, etc., the spraying is carried out from part 22. A powdered hardening agent is sprayed onto the inner circumferential wall of the old pipe, and the hardening agent is heated and welded by the heater 21 of the same coating head 11, so the hardening agent is applied to the desired position. It has the advantage of being able to quickly and reliably form the desired interior wall 23 by easily transporting it to the surface, injecting it into cracks, etc., and welding it.

(Other Embodiments) The present invention does not need to be limited to the above-mentioned embodiments, and if it is not necessary, it is not necessary to excavate the inner wall of the existing pipeline.

Furthermore, in the above embodiment, the case where the coating head is inserted and pulled again after the cutting head is pulled out is shown.
Instead, remove only the excavation head at the manhole shown in Figure 1, 2', attach the tip of the coating head to the tip of the shaft, and insert it into the existing pipeline using the shaft, connecting shaft, and drive device used for cutting. coating head,
It is more efficient to tow from the manhole 2' in FIG. 1 to the manhole 2.

[Brief explanation of drawings]

FIG. 1 is a schematic side view showing an embodiment of the method of replacing an existing pipe with a new pipe according to the present invention, and FIG. 2 is a partially cutaway side view showing an embodiment of the coating head used in the method. Third
The figure is a partially cutaway schematic side view showing the state in which the existing pipeline was replaced with a new pipeline using the same construction method. In the diagram 1...underground, 2.2'...manhole, 3
... Existing pipe line, 4 ... Underframe, 5 ... Cyclone reducer, 6 ... Drive device, 7 ... Connection shaft,
8...Cutting head, 9...Centering bearing, 10...Through hole of old pipeline, II...Coating head, I2...Main body, 13...・Bearing, 1
4... Roller, 15... Traction wire, etc., 1
6... Mounting tool, 17... Electric wire, 18... Connection tool, 19... High pressure hose, 20... Socket, 21... Heater, 22... Jet Attached part, 23.
...New inner wall. Patent applicant Mikio Hirose 2'1 Figure

Claims (1)

[Claims] A coating head equipped with a curing agent spray part and a heater, a high-pressure hose for pumping the curing agent, electric wires for heating the heater, etc. are installed on the inner periphery of the existing pipeline buried underground between the manholes. At the same time, a hardening agent in powder form is pumped to the spraying part of the coating head using the high-pressure hose. While spraying the curing agent from the spraying part onto the inner circumferential wall of the old pipe, the curing agent is heated by the heater of the coating head and welded to the inner circumferential wall of the old pipe, and the curing agent is applied to the inside of the old pipe as appropriate. A method for protecting the inner wall of an existing conduit, characterized by forming a new inner wall with a thickness of .