JP2852618B2 - Resin transfer pig for existing pipe lining repair method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention aims at repairing a supply pipe branched from a conduit, and in a first step, supplies a necessary amount of liquid resin required for lining the inside of the supply pipe to a level above the end of the supply pipe. The entire amount of the resin plug is transferred to the branch position on the conduit side by a liquid flow which is introduced into the pipe through the opening in a plug shape and press-fitted from the rear, and in the second step, the inside of the pipe is suctioned by the suction pump connected to the above-mentioned opening. During the first step of the lining method, the liquid flow is sucked and discharged, and the resin plug is drawn back to the end side of the supply pipe by the suction force to apply resin to the inner surface of the pipe to form a lining. The present invention relates to a resin transport pig used for transferring the entire amount of the resin plug to a branch position on the conduit side.

[0002]

2. Description of the Related Art As a lining method as described above, the present applicant has proposed a repair method as described in Japanese Patent Application Laid-Open No. 4-114773.

[0003] In this repair method, when a supply pipe branched toward a demand from a pipe laid under a road is targeted, a meter provided at the end side of the supply pipe is used as a repair method by non-digging. In the first step, a required amount of liquid resin required for lining the inside of the supply pipe is introduced into the pipe in a plug form and the liquid is pressed into the rear pipe from the above-mentioned opening. The entire amount of the resin plug is transferred to the branch position on the conduit side by the flow, and in the second step, the liquid flow is suctioned and discharged by the suction pump connected to the ground opening, and the resin drawn back to the end side of the supply pipe by the suction force Repair work is carried out so that a required lining film is formed by applying resin to the inner surface of the pipe by the flow of the plug.

[0004]

However, when lining is performed by the above-described method, the following troubles occur. That is, in the first step described above, in order to transfer the entire amount of the resin plug to the branch position on the conduit side,
A resin transport pig located at the rear of the resin plug to push the resin along the transport direction by the pressure of the liquid flow, and a liquid shielding pig located between the liquid flow to prevent the liquid flow from being mixed into the resin. In addition, a liquid absorbing material located between the resin transport pig and the liquid shielding pig is required so as to absorb the liquid leaking forward from a peripheral gap of the liquid shielding pig.

In the above-described construction method, the resin transport pig, the liquid absorbing material, and the liquid-shielding pig are simultaneously introduced into the pipe, and the entire amount of the resin plug is transferred to the branch position on the conduit side by the liquid flow pressed into the pipe behind the pipe. The three adjacent resin transport pigs, the liquid absorbing material, and the liquid shielding pig have poor friction when moving in the pipe because the respective frictional forces are generated, and the resin plug reaches the branch position on the conduit side. The time required for this becomes longer.

Further, at the time of the suction lining in the second step, the suction lining cannot be carried out smoothly because the number of the pigs as described above is large and the frictional force with the inner surface of the pipeline is large. I do.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems. In order to reduce the frictional force when a resin plug is transported in a pipe by a liquid flow, the present invention not only has a resin conveying function but also has a liquid shielding function. It is an object to provide a resin transport pig having the same.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention aims at repairing a supply pipe branched from a conduit and using a required amount of liquid resin required for lining the inside of the supply pipe. In the first step, the entire amount of the resin plug is transferred to the branch position on the side of the conduit by a liquid flow which is introduced into the pipe from the above-mentioned opening at the end of the supply pipe in a plug form and is injected from the rear thereof. The liquid flow in the pipe is suctioned and discharged by a suction pump connected to the opening, and the resin is applied to the pipe inner surface by the flow of the resin plug drawn back to the end side of the supply pipe by the suction force, thereby forming a lining of the pipe inner surface. In the lining repair method, in the first step, the pigs used to transfer the entire amount of the resin plug to the branch position on the conduit side are one resin transport pig, and the resin transport pig is The inside of the spherical elastic material is divided by a single liquid-shielding material, and the liquid-shielding material is interposed on the divided surface formed in this manner.

Further, according to the present invention, the liquid shielding material interposed in the resin transport pig is a circular thin material having a diameter equal to the inner diameter of the supply pipe to be repaired for lining, Another characteristic is that the resin transport pig is interposed at a cross-sectional position having the diameter.

[0010]

According to the present invention constructed as described above, in the first step, the pigs used to transfer the entire amount of the resin plug to the branch position on the conduit side are one resin transport pig. The frictional force with respect to the inner surface of the pipe caused by the single pig is the friction with the inner surface of the pipe caused by three pigs of the prior art (the three adjacent resin transport pigs, the liquid absorbing material and the liquid-shielding pig). Since the force is smaller than the force, the mobility when the resin transport pig moves in the pipe is improved, and the time required for the resin plug to reach the branch position on the conduit side is reduced. Further, at the time of the suction lining in the second step, the number of the pigs is reduced as described above, so that the frictional force with the inner wall of the pipeline is reduced, so that the suction lining can be performed smoothly.

Further, the resin transport pig is formed by dividing the inside of a spherical elastic material by one liquid shielding material and interposing the one liquid shielding material on the divided surface thus formed. And the liquid barrier material is a circular thin material having a diameter equal to the inner diameter of the supply pipe to be repaired for lining, and interposed at a cross-sectional position having the diameter of the resin transport pig. Therefore, the resin transport pig always faces the same surface in the traveling direction without receiving a rotational force when the resin is pressed forward by the fluid pressure behind, so that the surface of the liquid shielding material is aligned with the axis of the pipeline. If the resin transport pig is introduced into the pipe so as to be perpendicular to the core wire (actually, it may be inserted slightly deviated from the vertical position), the surface of the liquid barrier material is always perpendicular to the flow direction of the rear liquid. And the liquid flow comes into contact with the inner wall of the pipeline, It can be reliably prevented from entering the grayed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows a construction state of a first step (injection / transfer of resin into a pipe by a liquid flow). In the first step, the leveling pig 3 for lining work is introduced into the pipe so as to be located at the leading side of the resin plug introduced into the pipe. Then, using the resin injection device 11, the resin A is injected into the ground opening 1 with the hydraulic pressure obtained by the operation of the liquid feed pump 10.
Inject into the tube from 4. Thereafter, the resin transport pig 4 is introduced into the pipe at the same liquid pressure using the pig cassette 8. next,
Subsequently, by operating the liquid feed pump 10, the liquid B is sucked and pressurized from the liquid tank 9, and is injected into the supply pipe 7 through the liquid flow control device 20, so that the resin A is provided on the conduit 1 side. It is transported to branch position 2. R in the figure is a hose for returning excess liquid to the liquid tank so as to maintain a constant liquid pressure during liquid supply.

In the first step, pigs used for transferring the entire amount of the resin plug to the branch position on the conduit side include:
One resin transport pig 4 is provided. The resin transport pig 4
Is configured such that the inside of a spherical elastic member 5 is divided by a single liquid shielding material 6 and the single liquid shielding material 6 is interposed on the divided surface formed in this manner. Preferably, the liquid shielding material 6 is a circular thin material, has a diameter the same as the inner diameter of the supply pipe 7, and is interposed at a cross-sectional position having the diameter of the resin transport pig 4. Further, the liquid shielding material 6 is a resin film having a liquid shielding property, but may be formed by applying a resin adhesive to the above-described divided surface.

The resin transporting pig 4 formed as described above
When the resin A is pushed forward by the fluid pressure at the rear, the same surface always faces in the traveling direction without receiving a rotational force, so that the surface of the liquid shielding material 6 is perpendicular to the axis of the pipeline. When the resin transport pig 4 is introduced into the pipe as described above (actually, it may be inserted slightly deviated from the vertical position), the surface of the liquid shielding material 6 always has a vertical relationship with the flow direction of the rear liquid B. , Liquid shielding material 6
The liquid flow can be reliably prevented from being mixed into the resin plug by contacting the outer peripheral surface with the inner wall surface of the conduit.

FIG. 2 shows the second step (suction lining).
Shows the state of construction. In the second step, the pig stopper 18, the liquid recovery tank 17, and the suction pump 16 are connected in series to the pipe side. Suction pump 16
, The liquid flow B in the pipe is sucked and discharged, and the resin is applied to the pipe inner surface by the flow of the resin plug pulled back to the end side of the supply pipe 7 by the suction force to form a lining film.

[0016]

The pigs used for transferring the entire amount of the resin plug to the branch position on the side of the conduit at the time of the injection into the resin pipe in the first step need only be one resin transport pig, so that only one pig is required. Since the frictional force generated by the three pigs of the prior art (the three adjacent resin transporting pigs, the liquid absorbing material and the liquid-absorbing pig) is smaller than the frictional force generated by the three prior art pigs (the three adjacent pigs). Mobility when the transport pig moves in the pipe is improved, and the time required for the resin plug to reach the branch position on the conduit side is reduced. Further, at the time of the suction lining in the second step, since the number of the pigs is reduced as described above, the frictional force with the inner wall of the pipeline is reduced.
The suction lining work can be performed smoothly.
Therefore, the efficiency of the existing pipe lining repair work is improved.

Further, the resin transport pig is formed by dividing the inside of a spherical elastic material with one sheet of liquid-shielding material and interposing the one sheet of liquid-shielding material on the divided surface thus formed. And the liquid barrier material is a circular thin material having a diameter equal to the inner diameter of the supply pipe to be repaired for lining, and interposed at a cross-sectional position having the diameter of the resin transport pig. Therefore, the resin transport pig always faces the same surface in the traveling direction without receiving a rotational force when the resin is pressed forward by the fluid pressure behind, so that the surface of the liquid shielding material is aligned with the axis of the pipeline. If the resin transport pig is introduced into the pipe so as to be perpendicular to the core wire (actually, it may be inserted slightly deviated from the vertical position), the surface of the liquid barrier material is always perpendicular to the flow direction of the rear liquid. And the liquid flow comes into contact with the inner wall of It can be reliably prevented from being mixed into. Therefore, there is no need for a liquid absorbing material or a liquid shielding pig made of an expensive polymer-based resin material, so that the cost of the existing pipe lining construction can be reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a first step (injection / transfer of resin into a pipe by a liquid flow) using a resin transport pig of the present invention.

FIG. 2 is an explanatory view showing a second step (suction lining).

[Explanation of symbols]

 Reference Signs List 1 conduit 2 branching position 3 leveling pig 4 resin transport pig 5 spherical elastic material 6 liquid shielding material 7 supply pipe A resin B liquid

Continuation of front page (56) References JP-A-8-150363 (JP, A) JP-A-6-226185 (JP, A) JP-A-6-226184 (JP, A) JP-A-61-120674 (JP) JP-A-6-126233 (JP, A) JP-A-6-126231 (JP, A) JP-A-6-126247 (JP, A) JP-A-4-114773 (JP, A) 6-126248 (JP, A) JP 1-39833 (JP, B2) JP 2-25080 (JP, B2) German patent invention 3204386 (DE, A1) (58) Fields investigated (Int. Cl) . ^6, DB name) B05C 7/00 - 21/00 B05D 7/22 F16L 55/16 - 55/18 F16L 58/10

Claims (2)

(57) [Claims] In a first step, a required amount of liquid resin required for lining the inside of the supply pipe is plugged into the pipe from a ground opening at the end of the supply pipe. The entire amount of the resin plug is transferred to the branch position on the side of the conduit by the liquid flow which is introduced in the form of a liquid and press-fitted from the rear thereof, and in the second step, the liquid flow in the pipe is suctioned and discharged by the suction pump connected to the above-mentioned opening. In the lining repair method of the inner surface of the pipe, in which the resin is applied to the inner surface of the pipe by the flow of the resin plug pulled back to the end side of the supply pipe by the suction force to form a lining, the first step includes: The pigs used for transferring to the side branch position are one resin transport pig, and the resin transport pig is formed by dividing the inside of a spherical elastic material with one sheet of liquid shielding material. Formed was divided surfaces existing pipe lining method of the resin conveying pig, characterized in that it is constituted by interposing the 該Ichi sheets of barrier liquid material as. 2. The liquid shielding material interposed inside the resin transport pig according to claim 1, is a circular thin material, and has a diameter which is the same as the inner diameter of a supply pipe to be subjected to lining repair. A resin transport pig of an existing pipe lining method, which is interposed at a cross-sectional position having the diameter of the resin transport pig.