JP3215731B2 - Non-drilling cutoff method for unused supply pipes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a supply pipe which is branched from a gas pipe conduit (main pipe or branch pipe) buried under a road and drawn into a demanded residential land. The present invention relates to a non-excavation and blocking method for an unused supply pipe in which an inner pipe part is removed and a part of the supply pipe is left buried and left as it is.

[0002]

2. Description of the Related Art In a gas pipe, when a supply pipe branched from the above-mentioned conduit and drawn into a demanded residential land, when the supply pipe is discontinued, the supply pipe is usually separated from the boundary line between the road and the residential land. The inner pipe part piped to is removed. In this case, the part of the incoming supply pipe from the site boundary line to the road branch point on the road is left buried and left as it is, and the remaining pipe is called an unarranged supply pipe or an unused supply pipe. In. This unused supply pipe is prevented from leaking gas from the pipe line because the removal end is clogged, but if left unused for a long time, the remaining pipe wall may be corroded. Progresses, and gas leakage may occur from the corrosion hole.

Conventionally, as a leakage prevention process for such an unused supply pipe, a road is dug up to expose a branch portion of the conduit to the ground, and the branched supply pipe is cut to form a conduit. The work to close the connection opening of this was done. However, in this method, when performing the above-mentioned leakage prevention work, firstly, the traffic was cut off and the pavement was crushed, and then excavation was performed to expose the branch of the conduit to the ground. Because of the work involved, the excavation hole is relatively large, so it is difficult to dig the excavation hole, which takes a lot of time and effort, and backfills the excavation site. There was a problem that it took a lot of time and cost for the whole construction, such as re-paving and re-paving.

Accordingly, the applicant of the present invention has disclosed Japanese Patent Application Laid-Open No. HEI 4-18599.
In JP-A-4, the end of the unused supply pipe is dug at the withdrawal side to form an opening, and the length of the pipe from the opening to the branch point of the conduit is measured to make the pipe inner diameter and the pipe length less useless. Calculate the amount of resin that is clogged and filled in the entire area of the supply pipe, and inject the resin corresponding to the amount into the pipe by fluid pressure from a resin injector connected to the opening to fill the entire area of the unused supply pipe. We have proposed a method for preventing leakage of unused supply pipes that are closed to fill with resin.

[0005]

As the resin filled and filled in the entire area of the unused supply pipe, a two-pack mixed type high-viscosity resin composed of a room temperature-curable main agent and a curing agent is usually used. However, the price is rather expensive, and there is a problem that a large amount of resin is required to fill and fill the entire area of the unused supply pipe, resulting in an increase in cost. on the other hand,
The amount of resin required for hermetically closing the unused supply pipe at a specific position was small, and it was not necessary to fill the entire area of the unused supply pipe with the expensive resin.

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention can completely prevent gas leakage from an unused supply pipe by a relatively simple construction, and can minimize the amount of expensive resin used. It is an object of the present invention to provide a non-exciting cutoff method capable of reducing costs by using the method.

[0007]

In order to achieve the above-mentioned object, the present invention relates to a supply pipe which is branched from a conduit buried under a road and drawn into a residential land of a demand destination. The inner pipe portion is removed, and the supply pipe is closed and cut off by injecting resin into the unused supply pipe which is left buried in the buried state. Excavating the end blockage on the removal side to provide an opening, measuring the length of the pipe from the opening to the branch point of the conduit, calculating the inner diameter of the pipe, the pipe length, and the internal volume of the unused supply pipe, From the part, insert the necessary amount of resin to close and block the pipe, a mixing prevention member made of a material such as sponge, and a fluid filler such as cement or asphalt mortar in order. Branch of conduit to resin It is pushed to near, characterized in that so as to close the resin and flowing the filler is solidified tube at that position.

[0008]

According to the above construction, in the non-exciting and non-excavating method of the unused supply pipe of the present invention, an opening is formed by excavating the removal end on the residential land side, and a resin for closing and blocking the pipe from the opening. It is a method of pushing the unused supply pipe near the branch point of the conduit with the flowing filler and solidifying it together with the flowing filler, so it is necessary to excavate the road side deeply and expose the branch with the conduit to the ground. Therefore, it is not necessary to crush the pavement and dig deep and large excavation holes, and it is not necessary to repave the excavated traces. Can be greatly reduced.

[0009] Further, in this method, the amount of resin necessary for closing and blocking the pipe is removed from the terminal opening on the withdrawal side of the unused supply pipe by an inexpensive fluid filler through a mixing preventing member. This method pushes the pipe near the branch point of the used supply pipe and solidifies it together with the fluid filler, so that a large amount of expensive resin is not required unlike the conventional method of plugging and filling the entire unused supply pipe with resin. Therefore, construction can be performed at low cost. In addition, the resin and the fluid filler are not mixed by the mixing preventing member, and the unused supply pipe portion other than the blockage with the resin is filled with a fluid filler such as cement or asphalt mortar and solidified. Because there is
If the supply tube corrodes, the ground will not collapse as it would be if it were hollow.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 6 is an explanatory view showing a piping system of an unused supply pipe according to the present invention. In the drawing, reference numeral 1 denotes a conduit called a main pipe and a branch pipe laid below a road surface a at a required burial depth. Reference numeral 2 denotes a supply pipe branched from the conduit 1 and drawn into the demand destination residential land b. Due to the suspension, the inner pipe portion indicated by the imaginary line in the residential land b is removed from the boundary line c between the road surface a and the residential land b, and the retracted supply pipe 2 is connected to the conduit 1 on the road side from the removed position d. The part of the supply pipe 2 that reaches is left as it is buried. (The remaining supply pipe 2 is referred to as an unused supply pipe in the following description.)

In the present invention, as shown in FIGS. 1 to 5, a terminal blockage at the removal position d on the residential land b side of the unused supply pipe 2 is dug into a digging hole A, and An opening 2a is provided. When the opening 2a is opened, the pipe length L from the opening 2a to the branch point of the conduit 1 is measured, and the inner diameter e and the pipe length L of the unused supply pipe 2 are used to determine the length of the unused supply pipe 2 as a whole. Calculate the volume.

Then, a transparent hose 3 through which the inside can be seen is connected to the opening 2a, and a resin injector 4 is first connected as shown in FIG. The resin injector 4 is provided with a pump device 5 for accurately feeding the resin therein, so that the resin contained in the tank is fed out by a fixed amount.
From the resin injector 4, a pre-calculated amount of the high-viscosity resin 6 necessary for closing and blocking the unused supply pipe 2 is accurately extruded by the pump device 5 and is supplied through the hose 3. Pushed into tube 2.

As the high-viscosity resin 6, a two-pack type resin (epoxy resin) composed of a room-temperature-curable main agent (2/3) and a curing agent (1/3) is used. The required amount of the resin to be filled into the pipe 2 is determined from the pipe diameter e of the unused supply pipe 2 as described above. The pump device 5 of the resin injector 4 can measure the amount of the resin 6 to be injected.

The predetermined amount of the high-viscosity resin 6 is supplied to the opening 2
a into the unused supply pipe 2, the opening 2
The hose 3 is removed from a, and a pig-shaped mixing preventing member 7 made of a flexible material such as sponge is manually inserted from the rear of the high-viscosity resin 6 injected into the unused supply pipe 2. This state is shown in FIG.

Next, as shown in FIG.
A fluid filler injector 8 is connected via a hose 3 different from that used for the resin injector 4. In the injector 8, a fluid filler 9 such as cement or asphalt mortar, which is much cheaper than the high-viscosity resin 6, is housed, and a pump mechanism 10 provided in the injector 8 is compressed by an air compressor 11. It is operated by air, and the fluid filler 9 is injected into the unused supply pipe 2 from the opening 2a via the hose 3. Then, the high-viscosity resin 6 is pushed by the fluid filler 9 via the mixing preventing member 7, and the injection of the high-viscosity resin 6 is stopped when the high-viscosity resin 6 reaches just before the branch service tee 12. The high-viscosity resin 6 and the fluid filler 9 are solidified and the unused supply pipe 2 is closed (see FIG. 5).

In the non-exciting and non-excavation method of the unused supply pipe constructed in this manner, an opening 2a is formed by digging up the removal end of the unused supply pipe 2 on the residential land side. The amount of the resin 6 necessary for closing and blocking the pipe 2 is pushed by the fluid filler 9 to the vicinity of the branch point 12 of the unused supply pipe 2 and solidified together with the fluid filler 9. It is not necessary to dig deeper to expose the branch with the conduit 1 to the ground. Therefore, it is not necessary to crush the pavement of the road or dig deep and large excavation holes, and it is not necessary to backfill the excavation traces, pressurize, repave, etc., so that the processing work is greatly simplified. The construction period and construction costs can be greatly reduced.

Also, in this method, an amount of resin 6 necessary for closing and blocking the pipe 2 is flow-filled from the terminal opening 2a on the removal side of the unused supply pipe 2 with a mixing preventing member 7 interposed therebetween. Since the material 9 is pushed to the vicinity of the branch point 12 of the unused supply pipe and solidified together with the fluidized filler 9, a large amount of resin is required as in the conventional method of filling the entire unused supply pipe with resin. Therefore, it can be constructed at low cost. Further, when the resin 6 is moved by the mixing preventing member 7, the resin 6 and the fluid filler 9 do not mix with each other.
The airtightness after solidification is ensured, and reliable shutoff of the pipe is achieved.

Further, in this method, the resin 6, the mixing preventing member 7, and the fluid filler 9 are inserted in order from the terminal opening 2a on the removal side of the unused supply pipe 2, and the fluid filler 9 is removed.
As a result, the resin 6 is pushed to the vicinity of the branch point 12 of the conduit, so that the operation can be performed while the conduit 1 is in an active tube state through gas. In addition, since the unused supply pipe portion other than the portion clogged with the resin 6 is filled with the solidified fluid filler 9, even if the unused supply pipe 2 is corroded, as in the case where the unused supply pipe 2 is hollow. It is safe because the ground does not collapse.

Although the embodiment of the present invention has been described above, the present invention is not limited to this.

[0020]

As described above, according to the method of non-excavation and non-use of unused supply pipes of the present invention, an opening is formed by digging up the removal end on the residential land side, and the pipe is opened from this opening. This is a method in which the resin to be blocked or blocked is pushed and solidified by an inexpensive fluid filler to the vicinity of the branch point of the unused supply pipe, so the road side is dug deep and the branch part with the pipe is grounded. There is no need to expose it, so there is no need to crush pavements or dig deep and large holes, and it is not necessary to backfill excavation marks, pressurize, repave, etc., greatly simplifying the processing work. In addition, the construction period and construction costs can be greatly reduced.

[0021] Further, the construction method is such that an amount of resin necessary for closing and blocking a pipe is removed from an end opening on a removal side of an unused supply pipe by an inexpensive fluid filler through a mixing preventing member. This method pushes the pipe near the branch point of the used supply pipe and solidifies it together with the fluid filler, so that a large amount of expensive resin is not required unlike the conventional method of plugging and filling the entire unused supply pipe with resin. Therefore, construction can be performed at low cost. In addition, the resin and the fluid filler are not mixed by the mixing preventing member, so that the resin is not adversely affected. In addition, since the unused supply pipe portion other than the blockage with the resin is filled with the solidifying fluid filler, even if the supply pipe is corroded, the ground sinks as if it were hollow. There is no such thing.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a final step of an embodiment of a construction method according to the present invention.

FIG. 2 is a cross-sectional view showing a first step of the embodiment of the method according to the present invention.

FIG. 3 is a sectional view showing a second step of the embodiment of the method of the present invention.

FIG. 4 is a cross-sectional view showing a fourth step of the working example according to the present invention.

FIG. 5 is a partially enlarged sectional view showing a final step of an embodiment of the method according to the present invention.

FIG. 6 is an explanatory view showing a piping system of an unused supply pipe according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Conduit 2 Unused supply pipe 2a Opening 3 Transparent hose 4 Resin injector 5 Pump device 7 Mixing prevention member 8 Fluid filler injector 9 Fluid filler 10 Pump mechanism 11 Compressor 12 Service tee A Drilling hole

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-4-185994 (JP, A) JP-A-3-113185 (JP, A) JP-A-3-277888 (JP, A) JP-A-6-185 81995 (JP, A) JP-A-62-67385 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16L 1/024

Claims (1)

(57) [Claims] Claims: 1. A supply pipe branched from a conduit buried under a road and drawn into a residential land of a demand destination. The inner pipe portion in the residential land is removed by discontinuing use, and the supply pipe is buried as it is. In the non-excavation blocking method in which resin is injected into the unused supply pipe that has been left unremoved and closed and blocked, the opening of the unused supply pipe is provided by digging out the end blockage on the removal side, The length of the pipe from the opening to the branch point of the conduit is measured to calculate the inner diameter and length of the pipe and the inner volume of the unused supply pipe. From the opening, an amount of the pipe necessary for closing and closing the pipe is calculated. Resin, a mixing prevention member made of a material such as sponge, and a fluid filler such as cement or asphalt mortar are sequentially inserted, and the fluid filler pushes the resin to near a branch point of the conduit, and at that position. Resin and fluid filler Non drilling blocking method unused feed pipe, characterized in that solidified was to close the tube.