JP2015048425A - Lining resin for repairing the inside face of pipe leakage and process for repairing the inside face of pipe leakage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lining resin, in leakage repair for an inner pipe, usable for both of the inner pipe inside of a lamp piped in an exposed state and the inside pipe outside of a lamp piped in a buried state.SOLUTION: There is provided a lining resin used for the repair of the inside face of the leakage in a pipe to close the leakage hole of an object pipe from the inside by carrying a lining resin made to flow from one end of the object pipe toward the other edge by an air flow, in which the characteristic of the frequency of dynamic viscoelasticity (rad/sec)-viscosity (Pa sec) measured at 5 to 40°C satisfy 98 to 605 Pa sec in 0.1 rad/sec and 0.50 to 5.1 Pa sec in 500 rad/sec.

Description

  The present invention relates to a lining resin used for repairing an inner surface of a pipe leak and a method for repairing an inner surface of a pipe leak using the resin.

  As the resin lining method for the inner surface of a pipe line, various methods have been known for a long time as an inner surface repair method for an aged pipe line (for example, see Patent Document 1 below). Such an inner surface repair method is carried out for the purpose of preventing leakage of the pipeline by forming a uniform lining film on the inner surface of the pipeline.

  On the other hand, a leak-proof repair work that requires a high degree of urgency is a method in which liquid resin is sent into the pipe in an air stream and leaked from the inside by this resin to the pipe where leakage has already occurred. It is implemented as a law. This leak repair method does not require uniformity of the lining film itself formed on the inner surface, but the resin that reaches the leak hole by riding on the airflow effectively closes the leak hole from the inner surface, so that the air tightness of the pipeline The purpose is to recover.

JP-A-5-345166

  The above-described leak repair method is effectively implemented in the gas transportation pipeline, and is supplied to the customer's premises via the supply pipe branched from the main pipe buried under the road or via the supply pipe. Applied to leak repair for inner pipes. Here, the inner tube can be divided into a lamp inner tube upstream of the gas meter and a lamp inner tube downstream of the gas meter. However, most of the lamp inner tube is embedded in the ground. In contrast to the pipes, the inner pipe of the lamp is exposed on the ground, and there are differences in the extension distance and caliber, so the characteristics of the lining resin used for leak repair are changed. The construction is done.

  Since the inner tube of the lamp is piped in an exposed state, the leak hole is often formed locally and the hole diameter is relatively small. However, if the viscosity of the lining resin for leak repair is too low, the leak hole is reached. The pushed resin is pushed out by the air flow and blows out, so that the leakage hole cannot be effectively blocked. Accordingly, the lining resin for repairing leakage in the lamp inner tube must be selected to have a relatively high viscosity even at the expense of the conveyance performance in the tube by the airflow. For this reason, when the lining resin for the lamp inner tube is used, the extension distance can be applied only up to about 20 m, and it cannot be applied to a relatively large diameter pipe line such as 40A and 50A.

  On the other hand, the outer pipe of the lamp has a longer extension distance than the inner pipe of the lamp and has a relatively large diameter such as 40A and 50A. Therefore, it is unavoidable to select a material having a relatively low viscosity in order to prioritize the conveyance performance. In addition, the outer-light tube is often buried in the ground, and the outer periphery of the tube is covered with soil, which is an electrolyte, and leakage holes due to corrosion are often formed relatively large. In such a leak repair of the lamp inner tube, even if a lining resin having a low viscosity is used, the soil outside the leak hole can be hardened and adhered with the lining resin, so that the leak hole can be effectively blocked. As described above, the lining resin used for the repair of leakage in the lamp inner tube and the lamp inner tube requires different resin properties due to the difference in the respective laying conditions. Is currently used.

  However, since there are many cases where the leak location cannot be clearly identified without going to the site at the time of gas leak repair construction, when using the lining resin for the inner tube of the lamp and the lining resin for the inner tube of the lamp when going to the site. Both preparations have been made, and there has been a problem that the preparation for construction has to be complicated in spite of the urgent leakage repair.

  This invention makes it a subject to cope with such a situation. In other words, in the repair of leaks in the inner pipe, providing lining resin that can be used for both the lamp inner pipe that is piped in an exposed state and the lamp outer pipe that is piped in an embedded state, simplifies construction preparation. It is an object of the present invention to achieve this.

  In order to achieve such an object, the present invention comprises at least the following configuration.

  A lining resin used for repairing the inner surface of a pipe leak that transports the lining resin flowing from one end of the construction target pipe toward the other end by an air flow and closes the leakage hole of the construction target pipe from the inside, and has a temperature of 5 to 40 ° C The frequency (rad / sec) -viscosity (Pa · sec) characteristics of the dynamic viscoelasticity measured in the above are 98 to 605 Pa · sec at 0.1 rad / sec and 0.50 to 5.1 Pa at 500 rad / sec. -Lining resin for repairing internal surfaces of pipe leaks characterized by sec.

  The dynamic viscoelasticity frequency (rad / sec) -viscosity (Pa · sec) characteristic measured at a temperature of 5 ° C. to 40 ° C. is 98 to 605 Pa · sec at 0.1 rad / sec, and 0 at 500 rad / sec. Using a two-component mixed modified epoxy resin of .50 to 5.1 Pa · sec as a lining resin, the lining resin flowing from one end of the construction target pipe is conveyed toward the other end by an air flow, and a leakage hole of the construction target pipe is formed. Internal repair method for leaking pipes closed from the inside.

  The present invention having such a feature provides a lining resin that can be used for both an inner lamp tube that is piped in an exposed state and an outer lamp inner pipe that is piped in an embedded state in repair of leakage of the inner pipe. This makes it possible to simplify construction preparation.

It is the graph which showed the frequency (rad / sec)-viscosity (Pa * sec) characteristic of the dynamic viscoelasticity measured at the temperature of 5 to 40 degreeC of the lining resin which concerns on one Embodiment of this invention. It is explanatory drawing which showed the inner surface repair construction method of the pipe | tube leak using the lining resin which concerns on embodiment of this invention.

  Embodiments of the present invention will be described below. FIG. 1 shows frequency (rad / sec) -viscosity (Pa · sec) characteristics of dynamic viscoelasticity measured at a temperature of 5 ° C. to 40 ° C. of a lining resin according to an embodiment of the present invention.

  Most of the inner lamps that are piped in a state where most of them are buried in the ground have a diameter of 50 A or less and a relatively long extension distance. Further, the lamp inner tube, which is mostly exposed on the ground, has a diameter of 20 A or less and a relatively short extension distance. Therefore, the lining resin capable of repairing the inner surface of the tube leakage (hereinafter simply referred to as leakage repair) in both the lamp inner tube and the lamp inner tube conveys the lining resin to the end of a relatively long extension distance. It is required to have a fluidity that can be flown and to have a non-fluidity that does not blow out from the leakage hole by an air flow after adhering to the leakage hole. In order for the lining resin to exhibit such properties, it is necessary that the dynamic viscoelasticity of the lining resin exhibits a low viscosity when the movement is fast and exhibits a sufficiently high viscosity when the movement is slow.

  As a result of performing a leak repair test using a lining resin with various dynamic viscoelasticity adjustments, the present invention enables a repair process that closes the leak hole for all the construction objects and test temperatures shown in the table below. The lining resin is found and the appropriate range of its dynamic viscoelastic properties is specified.

  Measure the frequency (rad / sec) -viscosity (Pa · sec) characteristics of dynamic viscoelasticity for a lining resin that can be repaired to close the leak holes at all the construction objects and test temperatures shown in Table 1. The result of fitting the equation of the Cross-WLF viscosity model to the measured value is the graph shown in FIG. In addition, the measurement of the dynamic viscoelastic characteristic used the viscoelasticity measuring apparatus "ARES-G2" by a TA instrument company. Here, the test temperature set at 5 ° C and 40 ° C is added to the condition that construction can be performed regardless of the season by confirming that leakage repair is possible in both mid-winter and mid-summer construction. It is to do. The numerical value of each point in the graph of FIG. 1 is shown in the following table.

  As is apparent from this table, in order to exhibit the air flow performance of the lining resin well in the range of the tube diameter 15A to 50A and the tube extension distance of 30 m or less, the frequency ω is 500 rad / sec and the temperature 5 The viscosity at 40 ° C. needs to be in the range of 0.50 to 5.1 Pa · sec. Further, in order to close the 0.8 mm leak hole of the pipe that is piped in an exposed state, it is necessary that the frequency ω is 0.1 rad / sec and the viscosity at a temperature of 5 to 40 ° C. is in the range of 98 to 605 Pa · sec. become. By using a lining resin having such dynamic viscoelastic characteristics, one type of both the inner tube and the inner tube, which are mostly exposed piping, and the exposed inner tube, which are mostly exposed piping, are used. Leakage repair can be performed with lining resin.

  An example of the lining resin having the dynamic viscoelastic properties described above will be shown. This lining resin is, for example, a two-component mixed epoxy resin in which a main component whose main component is a modified epoxy resin and a curing agent whose main component is a modified alicyclic polyamine are mixed in a ratio of 100: 45. A lining resin having the above-described dynamic viscoelastic properties can be obtained by appropriately mixing a viscosity adjusting agent such as a thixotropic agent in the two-component mixed epoxy resin to adjust the viscosity.

  FIG. 2 is an explanatory diagram showing an inner surface repair method for pipe leakage using the above-described lining resin. In this construction method, the lining resin that has flowed from one end of the construction target pipe P is conveyed toward the other end by an air flow, and the leakage hole of the construction target pipe P is closed from the inside.

  The construction target pipe P may be either a lamp inner pipe buried in the ground or an exposed lamp inner pipe, and both ends thereof are opened during construction. An inlet P1 is formed on one end side of the construction target pipe P by removing a gas meter or the like, and the downstream end of the connection hose 10 is connected to the inlet P1. A discharge port 11 </ b> A of a resin injector (or resin tank) 11 is connected to the upstream end of the connection hose 10. The downstream end of the blower hose 12 is connected to the inlet 11 </ b> B of the resin injector 11, and the outlet 13 </ b> A of the blower 13 is connected to the upstream end of the blower hose 12.

  By driving the blower 13, the lining resin in the resin injector 11 is injected into the construction target pipe P from the injection port P <b> 1, conveyed by the air current, and discharged from the other end of the construction target pipe P. As a result, the lining resin is fed into the entire area indicated by the oblique lines in the construction target pipe P, and the lining resin reaches the leakage holes existing therebetween. At this time, the lining film formed on the inner surface of the construction target pipe P is not uniform, but if there is a leak hole, the air current blows out from there, so the lining resin positively reaches the leak hole by the air flow. The lining resin that did not adhere to the inner surface is discharged from the other end of the construction target pipe P. By arranging the collection container 14 at the other end of the construction target pipe P, the lining resin can be collected without contaminating the periphery.

10: Connection hose,
11: Resin injector (or resin tank), 11A: outlet, 11B: inlet
12: Blower hose, 13: Blower, 13A: Outlet, 14: Collection container,
P: Construction target pipe, P1: Injection port

Claims (3)

It is a lining resin used for repairing the inner surface of a pipe leak that transports the lining resin flowing from one end of the construction target pipe toward the other end by an air flow and closes the leakage hole of the construction target pipe from the inside,
The dynamic viscoelasticity frequency (rad / sec) -viscosity (Pa · sec) characteristic measured at a temperature of 5 ° C. to 40 ° C. is 98 to 605 Pa · sec at 0.1 rad / sec, and 0 at 500 rad / sec. A lining resin for repairing the inner surface of a pipe leak, characterized by being in the range of 50 to 5.1 Pa · sec.   The lining resin for repairing an inner surface of a pipe leak according to claim 1, wherein the main component is a two-component mixed modified epoxy resin. The dynamic viscoelasticity frequency (rad / sec) -viscosity (Pa · sec) characteristic measured at a temperature of 5 ° C. to 40 ° C. is 98 to 605 Pa · sec at 0.1 rad / sec, and 0 at 500 rad / sec. Using a two-component mixed modified epoxy resin of .50 to 5.1 Pa · sec as a lining resin,
An inner surface repair method for pipe leakage, in which the lining resin flowing from one end of the construction target pipe is transported toward the other end by an air flow to close the leakage hole of the construction target pipe from the inside.

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