JPH0814347B2 - Old pipe rehabilitation method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is a method of inserting a rehabilitating pipe into the inner surface of an aged pipe to rehabilitate the aged pipe. The present invention relates to a method for rehabilitating an aged pipe using a branch pipe in which a hose for injecting a filler is inserted and then a gap between the aged pipe and the rehabilitating pipe inserted into the inner surface of the hose is filled with a backfill.

(Prior Art) As a rehabilitation method for aging management, a method of excavating a road and replacing it with a new pipe has been generally used.
From the viewpoint of overcrowding of traffic, prevention of noise and vibration, shortening of construction period, reduction of construction cost, etc. recently, without removing old pipes,
The rehabilitation method, which inserts a slightly smaller diameter rehabilitation pipe into its inner surface and then fills the gap between the aged pipe and the rehabilitation pipe with a backfilling agent, is becoming the mainstream. Actually, as a unit for rehabilitation work between manholes, a rehabilitation pipe with a diameter slightly smaller than that of the aged pipe is inserted into the inner surface of the aged pipe, and the openings of both ends of the aged pipe are sealed. In the gap between the rehabilitation pipe and one of the pipe ends (providing an air vent on the other pipe end)
A method of injecting a backfilling agent with a hose or the like to fill the entire gap is used.

(Problems to be Solved by the Invention) In the above-mentioned conventional aging pipe rehabilitation method, from the viewpoint of shortening the construction period, it has been usual to use a backfilling agent which takes a short time from liquid to gelation.

However, if such a backfilling agent is injected only from one pipe end side, the fluidity of the backfilling agent decreases before reaching the other pipe end side when the distance between the manholes is long. There is a risk that the gap between the aging pipe and the rehabilitation pipe cannot be completely filled.

In order to prevent the occurrence of such a situation, a means of increasing the injection pressure of the backfilling agent and a means of simultaneously injecting the backfilling agent from both sealed pipe end sides of the aging pipe are taken.

However, when the flattening strength of the rehabilitating pipe is not large by the former means, there is a problem that the rehabilitating pipe is flattened by the injection pressure of the backfilling agent. There was a problem that air could not be removed from the gap and an air pool was present in the center.

(Means for Solving the Problem) A method for rehabilitating an aged pipe according to the present invention is to insert the rehabilitating pipe into the inner surface of an aged pipe having a branch pipe and fill the gap between the aged pipe with a backfilling agent to form the aged pipe. In the method of rehabilitation, a plug body in which the hose for backfill agent injection is identified so that the tip of the hose for backfill agent injection opens into the aged pipe, is fixed by inflating it on the end of the aged pipe side of the branch pipe. The above object is achieved by filling the gap between the aging pipe and the rehabilitation pipe with a backfilling agent from the hose.

In this invention, a hose for injecting a backfilling agent is inserted from a branch pipe whose upper end is connected to a sewage box provided between a manhole and a manhole, and the backfilling agent is used to feed the backfilling agent from an old pipe and a rehabilitating pipe. Since the injected backfilling agent is injected into the gap between the tube and the tube, the injected backfilling agent moves toward both tube ends in the above-mentioned gap to uniformly fill the entire gap.

Usually, a plurality of branch pipes are connected to the aged pipe at appropriate intervals, but in the present invention, it is preferable to use a branch pipe provided substantially in the center between manholes.

It is also possible to use two or more branch pipes if the air venting means is appropriately provided.

The material of the rehabilitating pipe inserted into the inner surface of the aged pipe is preferably synthetic resin such as hard vinyl chloride, polyolefin, nylon, acrylic, polyester, etc. Use is desirable.

Further, the stopper is inserted into the end portion of the branch pipe on the aged pipe side in order to prevent the injected backfilling agent from flowing into the branch pipe, and its material has expansion and contraction properties. Possible synthetic rubbers, soft plastics and the like are preferable, and the structure thereof is, for example, a donut-shaped hollow ring-shaped body, and when compressed air is blown into the hollow ring-shaped body, the structure expands and comes into close contact with the inner surface of the branching feeling. Is preferred.

 Further, the central portion of the plug body is a fitting insertion hole for the hose.

The shape of the stopper is appropriately selected according to the sectional shape of the mounting feeling.

The hose for injecting the backfilling agent is a flexible woven fabric,
A material such as synthetic rubber or soft plastics is preferable, and the hose and the plug are inserted as one piece into the aged pipe from the branch pipe to the extent that the tip of the hose slightly protrudes from the inner surface of the aged pipe. It may be a molded structure.

Cement milk, air mortar, ready-mixed concrete, etc. are used as the backfill agent.

(Operation) As described above, the present invention allows the hose for injecting the backfilling agent into the branch pipe so that the tip of the hose for injecting the backfill agent penetrates through the plug tightly fixed to the end portion of the branch pipe on the side of the old pipe. Fixed,
Since the back-filling agent is filled from the hose into the gap between the aging pipe and the rehabilitation pipe, the back-filling agent moves from the end of the hose toward the pipe end direction on the left and right sides in the gap between the aging pipe and the rehabilitation pipe. hand,
The entire gap is filled relatively quickly and uniformly.

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

FIG. 1 is a schematic view showing an embodiment of the present invention, FIG. 2 is a schematic view showing a branch pipe, an aged pipe and a hose, and FIG. 3 is an enlarged cross-sectional view showing the branch pipe. FIG. 4 is a partially cutaway sectional view showing only the plug body.

In the figure, reference numeral 1 is a branch pipe, an end of which is on the ground side is connected to a waste water container 7, and the other end is connected to an aging pipe 2.

A flexible hose 5 is inserted inside the branch pipe 1.

This hose 5 has an external hose 51 for transferring compressed air,
An internal hose 52 for transferring the backfilling agent 4 is formed, and the internal hose 52 is inserted inside the external hose 51 except for the tip portion on the ground side to form an integral structure.

The ground-side ends of the outer hose 51 and the inner hose 52 are separated and connected to the kick pump 9 and the backfill agent injection device 8, respectively.

The end portion of the hose 5 in which the external hose 51 and the internal hose 52 are integrated is attached to the plug 6 by being inserted into the plug 6 which will be described later. As shown, the end of the outer hose 51 is the end of the plug 6 on the side of the aged pipe and the sealing plate 53.
It is sealed by and does not project outside the stopper.

In addition, in the portion where the external hose 51 is inserted into the plug body 6,
A large number of through holes 54 are bored through the inner and outer surfaces of the hose.

On the other hand, the end of the inner hose 52 on the side of the aged pipe is the plug 6
And is attached to the plug body 6 so that its tip slightly projects out of the plug body 6.

A cylindrical stopper 6 made of synthetic rubber having a diameter smaller than the inner diameter of the branch pipe 1 is inserted on the inner surface of the side portion of the branch pipe 1 that is aged.

The plug body 6 expands when a fluid such as compressed air or water sent by the kick pump 9 through the external hose 51 flows into the plug body 6 through the through hole 54,
In the free state, it deforms to the shape shown by the phantom line in FIG. 4, but when it is inserted into the end portion of the aging pipe 1, it is closely fixed to the inner surface of the branch pipe 1.

Further, in order to enhance the adhesion between the plug body 6 and the inner surface of the branch pipe 1, a plurality of O-rings 61 are attached to the outer peripheral surface of the plug body 6.

Both ends of the aged pipe 2 are sealed, and the aged pipe 2 and the rehabilitation pipe 3
The air existing in the gap of (1) is discharged to the outside of the pipe through the air vents 11 and 11 'provided at both ends of the aged pipe together with the filling of the backfilling agent.

 Next, the step of filling the backfilling agent 4 will be described.

 First, the rehabilitation pipe 3 is inserted into the inner surface of the aging pipe 2.

This may be carried out by a conventional pipe-in-pipe method, but if possible, a pipe making machine is installed in the manhole A or manhole B, and a synthetic resin strip is supplied from the ground to these pipe making machines. By this, a spiral pipe is formed by spirally winding the strip-shaped body while adhering or fitting the overlapping both ends, and the spiral pipe is inserted into the aging pipe 2 as the rehabilitation pipe 3 by the propulsive force of this pipe manufacturing machine. It is preferable to adopt the method.

Before inserting the rehabilitation pipe 3, it is necessary to attach a water stopcock to the end of the aged pipe side of another branch pipe (not shown) not used for injecting the backfilling agent by using an appropriate means such as a robot. preferable.

This is to prevent the backfill agent from flowing into the other branch pipe.

Next, the plug 6 is inserted into the branch pipe 1 from the ground side, and when the tip reaches the inner surface of the aging pipe 2, compressed air is blown from the kip pump 9 through the external hose 51 to expand the plug 6. In this case, the inner surface of the branch pipe 1 is closely attached and fixed.

Next, the back-filling agent 4 is pressure-fed from the back-filling agent injection device 8 through the internal hose 52 and injected into the gap 10 between the aging pipe 2 and the rehabilitation pipe 3 from the tip of the internal hose 52. The injected backfilling agent 4 moves toward both pipe ends of the aged pipe 2 and uniformly fills the entire gap 10 between the aged pipe 2 and the rehabilitating pipe 3.

Finally, the air in the plug body 6 expanded with compressed air is removed,
After pulling up the plug body 6 together with the hose 5 to the ground, a snake wire with a cutter of a perforator (not shown) installed on the ground is inserted into the branch pipe 1 and filled between the aging pipe 2 and the rehabilitation pipe 3. By piercing the backfilling agent 4 and the pipe wall of the rehabilitation pipe 3, a series of aging pipe rehabilitation process is completed.

In the above-mentioned embodiment, the hose for injecting the backfilling agent is fixed at a predetermined position by expanding a plug having a diameter smaller than the inner diameter of the branch pipe attached to the tip thereof by an appropriate means. However, the present invention is not limited to this, for example, from the inside of the old floating pipe before inserting the rehabilitation pipe, install a plug body in the branch pipe by using a means such as a robot, and then insert the plug into the branch pipe. The end of the hose may be fixed so as to penetrate the plug.

(Effects of the present invention) Since the present invention is configured as described above, in an excellent rehabilitation construction method in which an aged pipe can be rehabilitated without performing excavation work, the rehabilitation pipe is placed in a gap between the aged pipe and the rehabilitation pipe. The backfilling agent can be completely filled without any adverse effect on.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of the present invention, and FIG. 2 is a schematic view showing a branch pipe, an aged pipe and a hose of the above.
FIG. 3 is a transverse sectional view showing only the branch pipe, and FIG. 4 is a partially cutaway sectional view showing only the plug body. 1 …… Branch pipe, 2 …… Old pipe, 3 …… Rehabilitation pipe, 4 …… Backfilling agent, 5 …… Hose, 6 …… Stopper, 7 …… Massage box, 8 …… Backfilling agent injection device , 9 …… Kick pump.

Claims (1)

[Claims] 1. A method of inserting a rehabilitation pipe into an inner surface of an aged pipe having a branch pipe and filling a gap between the aged pipe and the backfill agent to rehabilitate the aged pipe, wherein a tip of a hose for injecting a backfill agent is used. The hose for injecting the backfilling agent so that the opening of the backfilling agent penetrates into the aged pipe is expanded and fixed at the end of the aged pipe side of the branch pipe, and the backfilling agent is connected to the aged pipe and the rehabilitating pipe from the hose. A method for rehabilitating old pipes, which is characterized by filling the gaps in