JPH07122473B2 - Connection method for mounting pipe in old pipe rehabilitation method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Use) The present invention relates to a method of rehabilitating an aged underground pipe by using an aged underground underground pipe as a sheath pipe and inserting a new pipe into the sheath pipe. The present invention relates to a method of connecting a mounting pipe branched from an aged buried pipe and the new pipe and lining an inner surface of the mounting pipe.

(Prior Art) The water and sewage pipelines in Japan, which have reached a high penetration rate, have already entered the age of maintenance, and the method of rehabilitating dilapidated pipelines is drawing attention.

As a method of rehabilitating aged pipes, the replacement of new pipes has been the most common method, but the recent overcrowding of road traffic, damage to other underground buried objects, noise, vibration, etc. It is becoming very difficult to implement the replacement construction method by excavating the road surface because of pollution to residents, construction period and cost. Due to such circumstances,
Recently, the rehabilitation method has become the main method, in which old pipes are used as a sheath pipe without being removed, a new pipe with a slightly smaller diameter is inserted into the pipe, and then mortar is injected into the gap between the old pipe and the new pipe. It's starting. However, the inner diameters of old and new pipes are
If the size of the pipe is as small as 800 mm or less and the operator cannot work in it, it is difficult to liquid-tightly connect the mounting pipe branched from the old pipe and the new pipe. However, if a large number of mounting pipes are diverged, the work will be carried out over the entire surface, and the advantages of the rehabilitation method described above will be fully utilized. The current situation is not.

In order to solve such a problem, Japanese Unexamined Patent Publication No. 58-160693 discloses an insertion pipe in which a taper-shaped reducer having a seal packing having a V-shaped cross section on its outer peripheral surface is integrally connected to a rehabilitation single pipe. A connection construction method has been proposed in which the joint is connected to the existing pipe branch with a seal structure by packing, and the joint with the rehabilitation pipe (new pipe) is a welded structure.

(Problems to be solved by the invention) However, in the above-mentioned connection construction method, the insertion pipe has to be inserted from the side of the rehabilitation pipe (new pipe) due to its expanded diameter shape. Inner diameter of rehabilitation pipe (new pipe) is 80
If it is as small as 0 mm or less and a worker cannot enter it into the work, the insertion and welding work become extremely difficult, and it must be said that construction is virtually impossible. As described above, when a small diameter aged pipe buried deep in the ground is to be rehabilitated, various problems are inherent in the above-described connection construction method.

(Means for Solving Problems) The present invention solves the problems of the above-described conventional technology, and easily connects a new pipe and a mounting pipe without performing excavation work even for an aged pipe having a small diameter. The purpose of the present invention is to provide a construction method that is capable of lining the inner surface of the mounting pipe at the same time, and its gist is to install a rehabilitation new pipe inside an aged pipe where the mounting pipe is branched. In the old pipe rehabilitation method that inserts and fills the gap between the old pipe and the new old pipe with a backfilling agent, a flexible lining tube with an outer diameter that is almost the same as the inner diameter of the mounting pipe is used. In a state where it is applied and folded along the longitudinal direction, insert it into the inside of the attachment tube with the adhesive applied to the inner surface so that the tip projects from the round hole drilled in the rehabilitation new tube and lining it. Compressed air inside the tube A step of deforming by blowing air to bring it into contact with the mounting inner surface and the end surface of the round hole opening. A rubber air plug inserted into the lining tube is provided inside the branch hole of the round hole and the mounting tube near its root. It is inflated by sending compressed air to the inside of the lining tube, and the process of crimping the vicinity of the tip of the lining tube to the inner surface around the round hole of the rehabilitated new pipe, the open end surface of the round hole, and the inner surface of the branch root of the mounting tube is characterized. A method of connecting the mounting pipe in the old pipe rehabilitation method, and a flexible and pressure-expandable lining tube having an outer diameter smaller than the inner diameter of the mounting pipe in the old pipe rehabilitation method. In this state, the step of inserting the tip into the inside of the mounting tube having the adhesive applied on its inner surface so that the tip projects into the inside from the round hole formed in the rehabilitation new tube. The rubber air plug inserted in the lining tube is inflated by sending compressed air into the inside of the round hole and near the branch root of the mounting pipe, and the vicinity of the tip of the lining tube near the round hole of the rehabilitation new pipe. Inside,
Step of crimping to the end surface of the opening of the round hole and the inner surface of the branch root of the mounting pipe. In the state where the rubber air plug is inflated, the inside of the lining tube is pressurized with compressed air to expand its diameter, and the lining tube is bonded with an adhesive. And a step of crimping to the inner surface of the attachment pipe.

(Operation) In the present invention, the air plug inserted into the lining tube is inflated by sending compressed air into the inside of the round hole and the branch root of the mounting pipe in the vicinity thereof. It can be crimped to the inner surface around the round hole, the end surface of the through hole of the round hole, and the inner surface of the branch root of the mounting pipe.

It is possible to prevent the backfilling agent filled in the gap between the aged pipe and the rehabilitated pipe from flowing into the rehabilitated new pipe through the round holes or into the mounting pipe.

The tip of the lining tube will be closed, and the compressed air can apply pressure inside the lining tube.

And the like.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory view showing one step of one embodiment of the present invention, and FIG. 2 is an enlarged sectional view of an essential part thereof, in which 1 is an aging pipe, 2 is a mounting pipe, 3 is a rehabilitation new pipe, 4 is a The lining tube 5 is an air plug.

Here, the previous stage of the present invention will be briefly described with reference to FIG.

First, the rehabilitation new pipe 3 is inserted into the old pipe 1.

This may be performed by a known pipe-in-pipe construction method, but by installing a pipe making machine in the human hole A or the human hole B and supplying a synthetic resin strip from the ground to the pipe making machine, A method in which a body is spirally wound and overlapping ends are adhered or fitted to each other to form a spiral tube, and the spiral tube is inserted into the aged tube 1 as a rehabilitation new tube 3 by a propulsive force during the pipe manufacturing It is preferably used.

Here, the rehabilitation new pipe 3 is concentrically held inside the aged pipe 2 by a spacer 61 with wheels and the like.

Further, synthetic resin such as hard vinyl chloride, polyolefin, nylon, acryl and polyester is preferable as the material of the rehabilitated new pipe 3, and when the aged pipe 1 is severely corroded and strength cannot be expected, glass fiber reinforced synthetic resin It is preferable to use a composite tube.

Next, a round hole having a size substantially equal to the inner diameter of the mounting pipe 2 is drilled at a position corresponding to the mounting pipe 2 of the rehabilitation new pipe 3.

As shown in FIG. 4 (a), a snake wire 71 is installed from a drilling machine 7 (manufactured by Cantool Co., Ltd., a product name Electric Flexi Rodder) installed on the ground, and a snake wire 71 is passed through a guide roller 73 and a sewage basin 21 to attach the pipe 2. Insert inside. Then, by rotating the drum 74, the cutter 72 attached to the tip of the snake wire 71 is rotated to punch the rehabilitation new pipe 3.

As means for perforating the rehabilitated new pipe 3, not only the above-mentioned method but also a method for perforating the rehabilitated new pipe 3 from the inside by remote control as described in JP-A-61-44509 is adopted. May be.

After removing the sludge adhering to the inner surface of the mounting pipe 2 using a brush or the like, as shown in FIG. 4 (b), the mounting pipe 2
The adhesive 8 is applied to the inner surface of the.

It is preferable that the adhesive 8 has a low viscosity and a relatively slow curing speed, and a rubber / vinyl evaporation adhesive, a pressure-sensitive adhesive,
Phenol / epoxy reactive adhesive is used.

The above is the description of the previous stage of the present invention, and the present invention is not limited to the above method, and other known methods may be adopted.

In this way, the lining tube 4 is drawn into the mounting tube 2 having the adhesive 8 applied to the inner surface. (Refer to FIG. 3) To briefly explain this drawing method, first, a float such as a balloon ball is tied to the tip of the octopus thread, and this is made to flow down to the mounting pipe 2 while pouring water from the sewage basin 21, and the rehabilitation new pipe 3 To reach the downstream-side entrance hole B through the inside of. The tip of the octopus thread on the side of the dirty water basin 21 is tied to the wire cable 9, and the octopus thread is drawn from the human hole B to replace the octopus thread and the wire cable 9.

Next, the lining tube 4 is attached to the tip of the wire cable 9 on the sewage basin 21 side, and the wire cable 9 is pulled from the human hole B to draw the lining tube 4 into the mounting tube 2. When the tip of the lining tube 4 slightly goes out of the round hole of the rehabilitation new tube 3, the drawing is stopped.

This is preferably done while watching the image from the television camera 8 installed inside the rehabilitation new pipe 3.

The lining tube 4 may have a diameter substantially the same as the inner diameter of the mounting tube 2 and may be retracted in a folded state as shown in the drawing. Alternatively, the lining tube 4 has an outer diameter smaller than the inner diameter of the mounting tube 2 and an internal pressure is applied thereto. A tube having a property of easily expanding the diameter may be drawn in as it is, and therefore, a thin flexible tube made of a soft vinyl chloride resin, synthetic rubber or the like is required.

When folded and retracted, compressed air is blown into the lining tube 4 in order to restore the original shape and follow the inner surface of the mounting tube 2. Although not shown, rehabilitation new pipe 3
It is preferable to seal both ends of each of them with air plugs because the effect of blowing compressed air is further promoted.

Further, it is necessary to apply an adhesive to the outer peripheral surface of the distal end of the lining tube 4 in order to bond it with the rehabilitated new tube.

In this way, the air plug 5 is inserted into the inner end portion of the lining tube 4 inserted into the mounting tube 2 having the inner surface coated with the adhesive 8 on the rehabilitation new tube 3 side.

The air plug 5 is preferably made of rubber and has a cylindrical capsule shape having an outer diameter larger than the inner diameter of the mounting tube 2 when the air plug 5 is filled with air or the like. An air hose 51 is attached to one end of the air plug 5 so that air is sent from a compressor 7 installed on the ground. First, the air plug 5 is attached to the tip of the air hose 51 in a state where air is removed, and this is inserted into the lining tube 4. Observing with the television camera 8, the insertion is stopped with the air plug 5 slightly protruding from the tube end of the lining tube 4. Air plug 5 in this state
It is inflated by sending compressed air from the compressor 7 to the inside of. The gauge pressure inside the air plug 5 may be 0.5 Kg / cm ² or more when the backfilling agent 6 injected into the gap between the old pipe 1 and the rehabilitation new pipe 3 is air mortar or cement milk. If it is ready-mixed concrete, 2 Kg / cm ² or more is required. As the air plug 5 expands, the vicinity of the tip of the lining tube 4 is pressure-bonded to the inner surface around the round hole of the rehabilitation new pipe 3, the end surface of the round hole and the inner surface of the branch root of the mounting pipe 2 with an adhesive agent. .

In this state, the backfilling agent 6 such as air mortar, cement milk, fresh concrete, etc., in the gap between the old pipe 1 and the new rehabilitation pipe 3.
Inject.

The presence of the air plug 5 prevents the backfilling agent 6 from flowing into the rehabilitation new pipe 3 or the mounting pipe 2 through the round hole.

When the lining tube 4 has an outer diameter smaller than the inner diameter of the mounting tube 2, air is introduced into the lining tube 4 before the backfilling agent 6 is injected or before the backfilling agent 6 is cured. The compressed air is sent from the hose 41 to expand the diameter, and adhere to the inner surface of the mounting pipe 2 via the adhesive 8.

When the lining tube 4 has an outer diameter that is substantially the same as the inner diameter of the mounting tube 2, since it is adhered along the inner surface of the mounting tube 2 in the previous stage, the inside of the lining tube 4 is as described above. It is preferable to feed compressed air again to increase the reliability of the adhesive strength, but it is not always necessary.

When the backfilling agent 6 has hardened to some extent, the air plug 5
Pull out after releasing the pressure inside it. However, if the compressed air inside is not released and is gradually pulled out while adjusting the pressure, the air plug 5 presses the lining tube 4 against the inner surface of the mounting pipe 2 and from the rehabilitation new pipe 3 side to the wastewater basin 21 side. This is preferable because the air pool remaining at the bonding interface is removed to the outside by further moving to, and the bonding becomes stronger.

Finally, the construction is completed by cutting and finishing the lining tube 4 protruding from the end of the mounting pipe 2 on the side of the dirty water column 21.

(Effects of the Invention) Since the present invention is configured as described above, even if an aged pipe has a small diameter so that an operator cannot enter the inside, there is no need to open or close the mounting pipe, and therefore traffic restrictions on the road are restricted. It is possible to reliably and easily connect the rehabilitation new pipe and the mounting pipe without performing the above, and at the same time, it is possible to line the inner surface of the mounting pipe. Therefore, it is possible to significantly reduce the construction cost and the construction period.

[Brief description of drawings]

FIG. 1 is an explanatory view showing one step of one embodiment of the present invention, and FIG.
The drawing is an enlarged cross-sectional view of the main part of FIG. 1, FIG. 3 is an explanatory view showing a state in which the lining tube is pulled into the mounting pipe, and FIGS. 4 (a) and 4 (b) are for explaining a front stage of the present invention. FIG. 1 ... Aged pipe, 2 ... Mounting pipe, 3 ... Refurbished new pipe, 4 ... Lining tube, 5 ... Air plug, 6 ... Backfilling agent

Claims (2)

[Claims] 1. In an aged pipe rehabilitation method in which a rehabilitation new pipe is inserted into an aged pipe having a branched installation pipe, and a backfilling agent is filled in a gap between the aged pipe and the rehabilitation new pipe, the inner diameter of the attachment pipe is almost equal to that of the old pipe. A flexible lining tube having the same outer diameter is applied to the outer peripheral surface of the tip and folded along the longitudinal direction, and the tip is regenerated inside the mounting tube with the adhesive applied to the inner surface. Insert the new pipe so that it projects into the inside from the round hole drilled, and blow the compressed air into the inside to restore the shape and make it contact the inner surface of the mounting pipe and the end surface of the round hole. Process The rubber air plug inserted in the lining tube is inflated by sending compressed air into the inside of the round hole and near the branch root of the mounting tube, and the vicinity of the tip of the lining tube is rehabilitated new pipe. The inner surface of the peripheral round hole,
A method for connecting a mounting pipe in an aged pipe rehabilitation method, which comprises the step of crimping the end face of a round hole and the inner surface of a branch root of a mounting pipe. 2. In an aging rehabilitation method in which a rehabilitation new pipe is inserted inside an aged pipe having a branched installation pipe, and a backfilling agent is filled in a gap between the aged pipe and the rehabilitation new pipe, the diameter is smaller than the inner diameter of the attachment pipe. A flexible and pressure-expandable lining tube having an outer diameter is used, with at least the outer peripheral surface of the tip having an adhesive applied, and the inside of the mounting tube having the adhesive applied to the inner surface of the tube. Inserting the rubber air plug inserted into the lining tube into the circular hole and the vicinity of the branch root of the mounting pipe so that compressed air is fed into the inside of the lining tube so as to protrude from the round hole punched in The inner surface of the rehabilitation new pipe around the round hole,
Step of crimping to the end surface of the opening of the round hole and the inner surface of the branch root of the mounting pipe. In the state where the rubber air plug is inflated, the inside of the lining tube is pressurized with compressed air to expand its diameter, and the lining tube is bonded with an adhesive. And a step of crimping the inner surface of the attachment pipe to the inside of the attachment pipe.