JP2852617B2 - 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.

[0005] In the construction method described above, 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. Since the resin transport pig, the liquid absorbing material, and the liquid-shielding pig which are adjacent to each other generate frictional force, the mobility when moving in the pipe is poor, 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 a spherical elastic material is equally and spatially symmetrically divided by a plurality of liquid shielding materials, and a plurality of divided surfaces formed in this way are provided with the plurality of liquid shielding materials interposed therebetween. It is characterized by being.

Further, according to the present invention, the resin transporting pig is divided into three parts by uniformly and spatially symmetrically dividing the interior of the spherical elastic member into eight parts by three liquid shielding materials. Another feature is that the three liquid shielding materials are interposed.

[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 between the single pig and the inner surface of the pipe is caused by the friction between the three prior art pigs (the three adjacent resin transporting 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.

[0011] Further, the resin transport pig is divided equally and spatially symmetrically into a spherical elastic material by a plurality of liquid-shielding materials, and the plurality of divided surfaces are formed on a plurality of divided surfaces thus formed. Even if the transport pig rotates in the pipe while transporting the resin, the transporting pig always rotates among the plurality of fluid shielding materials symmetrically arranged in each direction and space because of being configured with the liquid shielding material interposed therebetween. One of the surfaces is perpendicular to the direction of the liquid flow behind it, and it is ensured that the liquid flow is mixed into the resin plug by the outer peripheral surface of the liquid shielding material coming into contact with the inner wall surface of the conduit. Can be prevented.

[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 the excess liquid to the liquid supply tank so as to maintain the liquid pressure during liquid supply constant.

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 constructed such that the inside of a spherical elastic material is equally and spatially symmetrically divided by a plurality of liquid shielding materials, and the several liquid shielding materials are interposed on a plurality of divided surfaces thus formed. ing. Preferably, as shown in FIG. 1, the inside of a spherical elastic member 5 is equally and spatially symmetrically divided into eight by three liquid shielding members 6 and the three divided surfaces are formed on three divided surfaces thus formed. Liquid barrier material 6
Are interposed. 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 transport pig 4 constructed as described above
, The inside thereof is equally and spatially symmetrically divided into eight by three liquid shielding materials 6, and the three liquid shielding materials 6 are interposed on the three divided surfaces thus formed. Therefore, even if the transport pig rotates in the pipe while transporting the resin, any one surface of the three liquid shielding materials 6 arranged symmetrically in each direction and space is always behind the surface. The liquid flow is perpendicular to the direction of the liquid flow, so that the liquid flow can be reliably prevented from being mixed into the resin plug by the outer peripheral surface of the liquid shielding material being in contact 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, 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. Therefore, the efficiency of the existing pipe lining repair work is improved.

Further, the resin transporting pig is divided equally and spatially symmetrically with respect to a spherical elastic material by a plurality of liquid shielding materials, and the plurality of divided surfaces are formed on a plurality of divided surfaces thus formed. Even if the transport pig rotates in the pipe while transporting the resin, any one of the plurality of liquid shield materials arranged symmetrically in each direction and space, because the transport pig is configured to have the liquid shield material interposed therebetween. One surface must be perpendicular to the direction of the liquid flow behind it, making sure that the liquid flow mixes with the resin plug when the outer peripheral surface of the liquid barrier material contacts the inner wall of the conduit. Can be prevented. Therefore, there is no need for a liquid-absorbing material or 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-8-150364 (JP, A) JP-A-6-226185 (JP, A) JP-A-6-226184 (JP, A) JP-A-6-226184 126233 (JP, A) JP-A-6-126247 (JP, A) JP-A-4-114773 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) B05C 7/00-21 / 00 B05D 7/22 F16L 58/10 F16L 55/16-55/18

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 pipe and pressed from behind, 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 repairing method for the inner surface of the pipe, in which the resin is applied to the inner surface of the pipe by a flow of the resin plug pulled back to the end side of the supply pipe due to the suction force, a lining is formed on the inner surface of the pipe. The pigs used for transferring to the side branch position are one resin transport pig, and the resin transport pig has a spherical elastic material that is uniformly and internally provided by a plurality of liquid barrier materials. Spatial symmetrically divided thus formed existing pipe lining method of the resin conveying pig, characterized in that it is constituted by interposing a plurality number of sheets of barrier liquid material into a plurality of divided surfaces. 2. The resin transport pig according to claim 1, wherein the inside of the spherical elastic member is equally and spatially symmetrically divided into eight parts by three liquid-shielding members and formed into three divided surfaces. A resin transport pig of an existing pipe lining method, wherein the three liquid barrier materials are interposed between the resin transport pigs.