JP2525847B2 - Old pipe rehabilitation method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a process of rehabilitating an aged pipe by inserting a rehabilitating pipe, and more particularly, a backfill agent in a gap between the inserted rehabilitating pipe and the aged pipe. Rehabilitation method for aged pipes to reliably fill pipes.

(Prior Art) As a method of rehabilitating aged pipes, a method of excavating the 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 the inside of the rehabilitation pipe and then fills the gap between the aged pipe and the rehabilitation pipe with a backfilling agent, is becoming the mainstream. In practice, a rehabilitation pipe with a diameter slightly smaller than that of the aged pipe was inserted into the aged pipe as a unit of rehabilitation work between the manholes, and the openings of both ends of the aged pipe were sealed (one pipe (Air vent holes are provided on the end side)
After that, in the gap between the aging pipe and the rehabilitating pipe, a backfilling agent is injected from the other pipe end side where no air vent hole is provided to the other pipe end side with a hose etc., and the whole gap is filled. Is being done.

(Problems to be Solved by the Invention) In the above-described 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 to reach a gel state from a liquid state.

However, if such a backfilling agent is injected only from one pipe end side, when the distance between the manholes is long, the fluidity of the backfilling agent decreases before reaching the other pipe end side. Therefore, there is a possibility 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, and by the latter means, there is a problem of deterioration between the old pipe and the rehabilitating pipe. There is a problem that air cannot be sufficiently removed from the gap, and an air pool in which the backfilling agent is not filled occurs in the center of the gap.

Further, a means for injecting the backfill agent from the hose while inserting the hose for injecting the backfill agent into the gap between the aging pipe and the rehabilitation pipe and pulling out the hose from the gap is also conceivable. There was a problem that the hose could not be pulled out smoothly if the reinforcing rib was projected or if the inner peripheral surface of the aged pipe had irregularities such as sludge.

(Means for Solving the Problem) The method for rehabilitating an aged pipe according to the present invention is made to solve the above-mentioned problems of the conventional technique. In the method of rehabilitating an aged pipe by filling the gap between the aged pipe and the rehabilitated pipe, a hose with a backflow prevention sealing material fixed near the tip is inserted into the pipe wall with many injection holes. A sheath tube having
After locating in the gap between the aging pipe and the rehabilitating pipe, sealing both ends of the aging pipe in the state where the hose is inserted by the sealing plate provided with the air vent hole, the hose is sequentially While pulling out from the inside of the sheath tube, through the injection hole of the sheath tube from the hose, the backfill agent is sequentially filled into the gap between the aged pipe, the rehabilitating pipe and the sealing plate while preventing backflow with the sealing material, and then the backfill agent. The above-mentioned object is achieved by the step of removing the sealing plate when the is cured.

In the present invention, after inserting a sheath tube having a large number of injection holes in the gap between the aging pipe provided between the manhole and the manhole and the rehabilitation pipe and the sealing plate inserted inside the aging pipe, While inserting a hose to which a sealing material for backflow prevention is fixed near the tip part into the inside of the sheath tube and backfilling material transferred in the hose through the injection hole of the sheath tube to prevent backflow by the sealing material Fill the gap.

A sealing material for preventing backflow is fixed near the tip of the hose. The sealing material is preferably a material such as synthetic rubber having flexibility, and its outer diameter is the inner diameter of the sheath tube. Is used.

The hose is inserted so as to almost reach the other tube end side from one tube end side of the sheath tube, while the injection of the backfilling agent is started, while sequentially moving inside the sheath tube in the direction of being withdrawn from the sheath tube, Through the injection hole of the sheath pipe, the backfilling agent is sequentially filled in the gap between the aging pipe, the rehabilitation pipe and the sealing plate while preventing backflow by the sealing material.

The sheath tube is preferably made of a material having low surface friction resistance, and a plastic tube such as a hard vinyl chloride tube is suitable.

The means for locating the sheath tube in the gap between the aging tube and the rehabilitating tube is appropriately selected from the following two methods.

The first is a means for inserting a rehabilitation pipe into an aging pipe and then inserting it into a gap between the two by using a tow rope or the like.
The second is a means for inserting a rehabilitating pipe into the inside of an aged pipe in which a sheath pipe has been previously inserted using a tow rope or the like.

The sheath pipe inserted into the gap between the aged pipe and the rehabilitating pipe is fixed in contact with the upper part of the outer peripheral surface of the rehabilitating pipe and the upper part of the inner peripheral surface of the aged pipe.

The sheath tubes may be inserted one by one in the left-right direction of the rehabilitation tube.

The shape of the injection hole formed in the sheath tube is preferably circular or oval with a small passage resistance so that the backfilling agent can be injected quickly without interruption. It is determined as appropriate according to the width of the gap with the back filling agent, the filling distance of the back-filling agent, the injection amount, and the like.

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

(Operation) As described above, the backfilling agent is backed by the sealing material in the gap between the aged pipe, the rehabilitating pipe and the sealing plate from the tip of the hose that sequentially moves inside the sheath pipe through the injection hole of the sheath pipe. Since the sequential injection is performed while preventing the flow, the distance that the backfilling agent flows in the gap is shortened, and gelation does not occur while flowing in the gap.

Since the hose moves inside the sheath pipe, the hose does not come into direct contact with the inner surface of the aged pipe or the outer surface of the rehabilitated pipe, and the flow becomes extremely smooth.

Further, since the sealing material is fixed near the tip of the hose, the back-filling agent is prevented from wrapping around in the drawing direction of the hose, and the hose moves more smoothly.

Further, the air existing in the gap between the aging pipe and the rehabilitation pipe is sequentially discharged from the air vent hole as the backfilling agent is injected, so that the inclusion of air in the backfilling agent is prevented and the generation of voids is prevented. suppress.

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 cross-sectional view showing a ZZ cross section of the above, FIG. 3 is a sheath tube,
FIG. 4 is a cross-sectional view showing the sealing material and the hose, and FIG. 4 is a schematic view showing only the sheath tube.

In the figure, 1 is an aging pipe, and 2 is a rehabilitating pipe inserted inside the aging pipe 1.

Numeral 3 is a sheath pipe, and as shown in FIG. 2, one is inserted into each of the left and right sides slightly above the gap 8 between the aging pipe 1 and the rehabilitation pipe 2, and a number of circular injection holes are provided around the gap. 31 is bored (see FIG. 4), and the hose 4 for injecting the backfill material 6 is inserted therein.

Reference numeral 5 is a donut-shaped sealing material that is fixed near the tip of the hose 4.

 Next, the step of filling the backfill material 6 will be described.

 First, the rehabilitation pipe 2 is inserted into the aging pipe 1.

This may be carried out by the conventional pipe-in-pipe construction method, but a pipe manufacturing machine is installed in the manhole A or manhole B, and synthetic resin strips are supplied from the ground to these pipe manufacturing machines. The 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 the pipe manufacturing machine. The method is preferred.

Next, inside the sheath tube 3 inserted into the gap 8 between the aging pipe 1 and the rehabilitating pipe 2, a hose 4 having a donut-shaped sealing material 5 fixed near the tip end thereof From the end side, the tip is inserted so that it almost reaches the other pipe end side of the aged pipe 1.

Similarly, the other sheath pipe 3 ′ is used for the old pipe 1 and the rehabilitation pipe 2.
A hose 4'to which a sealing material is fixed is inserted in the sheath pipe 3 ', and the sheath pipe 3 and the rehabilitation pipe 2 are inserted in a gap 8 between them to face each other.

Next, both pipe ends of the aging pipe 1 are sealed by the sealing plates 10 and 10 'provided with the air vent holes 9 and 9', and the rehabilitation pipe 2 is floated or deformed as the backfilling agent 6 is filled. To prevent
After the inside of the rehabilitation pipe 2 is filled with water, the injection pump 7 is operated to start the injection of the backfill material 6.

With the filling of the backfill material 6, the hose 4 is sequentially moved in the direction of pulling out from the sheath tube 3, and the backfill agent 6 is uniformly filled in the entire gap 8 between the aged pipe 1 and the rehabilitation pipe 2.

Stop the movement of the hose 4 just before the tip of the hose 4 passes through the end of the aged pipe 1, and use the backfilling agent 6 from the air vent holes 9 and 9 '.
The injection of the backfilling agent 6 is continued until the liquid flows out.

The speed at which the hose 4 is pulled out is determined by the injection amount, the size of the gap 8 and the like.

Then, when the backfilling agent 6 has hardened, the sealing plates 10 and 10 'at both ends of the rehabilitation tube are removed to drain the water from the rehabilitation tube 2, and then the air vent holes 9 and 9'and the sheath tube 3 The backfilling agent 6 is closed to complete a series of aging pipe rehabilitation steps.

Therefore, the sheath tube 3 is directly embedded in the backfill material 6.

(Effects of the Invention) Since the present invention has been rehabilitated as described above, it is possible to rehabilitate an aged pipe without performing excavation work, and the backfilling agent filled in the gap between the aged pipe, the rehabilitated pipe and the sealing plate is Since the hose with the sealing material fixed near the tip inserted into the inner surface of the sheath tube is injected while moving, the hose does not come into contact with the inner or outer surface of the aged pipe, and the resistance of the backfilling agent is high. It is possible to freely move the inside of the sheath tube in the insertion direction without receiving the stress, and it is possible to fill a long-distance void before the backfilling agent gels.

In addition, the back-filling agent is prevented from flowing back into the gap between the aging pipe, the rehabilitating pipe and the sealing plate in the hose withdrawal direction by the sealing material, and the air existing during the period is sequentially discharged from the air vent hole. However, voids are not generated in the filled backfilling agent.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of the present invention, FIG. 2 is a cross-sectional view showing a ZZ cross section, FIG.
FIG. 4 is a schematic view showing the sealing material and the hose, and FIG. 4 is a schematic view showing only the sheath tube. 1 ... Aged pipe, 2 ... Rehabilitation pipe, 3,3 '... Sheath pipe, 4,4' ... Hose, 5
… Sealant, 6… Backfilling agent, 7… Injection pump, 8… Gap, 9,9 ′
… Air vent holes.

Claims (1)

(57) [Claims] 1. A method for inserting a rehabilitation pipe into an aged pipe and inserting a backfilling agent into the gap between the aged pipe and the rehabilitated pipe to rehabilitate the aged pipe. Place a sheath pipe with a large number of injection holes in the pipe wall where a hose fixed in the vicinity is inserted inside the gap between the aged pipe and the rehabilitated pipe, and then remove air from both pipe ends of the aged pipe. A step of hermetically sealing the hose with a sealing plate provided with a hole, and a step of successively pulling the hose from the inside of the sheath tube, and through the injection hole of the sheath tube from the hose, backing the backfill agent with a sealing material. A method for rehabilitating an aged pipe, which comprises a step of sequentially filling a gap between an aged pipe, a rehabilitating pipe and a sealing plate while preventing a flow, and then removing the sealing plate when the backfilling agent hardens.