阅读说明：本技术 一种新型水下管道渗漏快速修复施工方法 (Novel construction method for quickly repairing leakage of underwater pipeline ) 是由 陆志华 陈丽萍 于 2020-06-11 设计创作，主要内容包括：本发明提供一种新型水下管道渗漏快速修复施工方法,通过在渗漏管道的拟浇筑区域安装U型钢制护套并浇灌聚合物树脂混凝土实现水下管道渗漏快速修复,还提供了所述聚合物树脂混凝土的组成配比：聚合物树脂基体12-20％,水泥7-15％,石子30-40％,促进剂0.07-0.12％,引发剂0.07-0.12％,余量为砂子,所述聚合物树脂基体为环氧树脂、聚氨酯预聚体与不饱和聚酯、取代乙烯的组合物；所述聚合物树脂混凝土可以促进界面浸润从而获得较好的湿粘结强度。(The invention provides a novel construction method for rapidly repairing leakage of an underwater pipeline, which realizes rapid repair of leakage of the underwater pipeline by installing a U-shaped steel sheath in a to-be-poured area of the leakage pipeline and pouring polymer resin concrete, and also provides a composition ratio of the polymer resin concrete: 12-20% of polymer resin matrix, 7-15% of cement, 30-40% of stones, 0.07-0.12% of accelerator, 0.07-0.12% of initiator and the balance of sand, wherein the polymer resin matrix is a composition of epoxy resin, polyurethane prepolymer, unsaturated polyester and substituted ethylene; the polymer resin concrete can promote interface infiltration so as to obtain better wet bonding strength.)

1. A novel construction method for rapidly repairing leakage of an underwater pipeline is characterized by comprising the following steps:

(1) positioning and cleaning foundation for leakage part

After the leakage position is found out, the leakage position and the peripheral area are integrally cleaned by a high-pressure water gun, surface sundries are removed, and the base of the bottom of the leakage position of the pipeline is cleaned within a certain range;

(2) sheath installation

Installing a U-shaped steel sheath in a to-be-poured area of the pipeline, wherein side plates are arranged on the front and the back of the top of the U-shaped steel sheath, a cover plate is arranged on the top of the U-shaped steel sheath, and after the U-shaped steel sheath is installed, a large amount of stones are thrown below the underwater pipeline and the U-shaped steel sheath, so that the underwater pipeline and the U-shaped steel sheath are in a stable fixed state;

(3) irrigation repair

Pouring the mixed polymer resin concrete into the U-shaped steel sheath, covering the cover plate after the U-shaped steel sheath is fully poured, fastening, and finishing leakage repair after the poured polymer resin concrete is cured;

the polymer resin concrete comprises a polymer resin matrix, stones, sand, cement, an accelerant and an initiator, and the composition ratio is as follows: 12-20% of polymer resin matrix, 7-15% of cement, 30-40% of stones, 0.07-0.12% of accelerator, 0.07-0.12% of initiator and the balance of sand, wherein the polymer resin matrix is a composition of epoxy resin, polyurethane prepolymer, unsaturated polyester and substituted ethylene;

the preparation method of the polyurethane prepolymer comprises the following steps: slowly adding diisocyanate with the molar ratio of-NCO/-OH of 2.2 into dehydrated and dried castor oil while stirring, controlling the reaction temperature at 60-70 ℃, stirring for reaction for 1h, and cooling to obtain the polyurethane prepolymer.

2. The novel rapid repair construction method for underwater pipeline leakage according to claim 1, wherein in the step (3), if the leakage position is large, a sheet of sheet iron is used to cover the seam surface before pouring, and then concrete is poured.

3. The novel rapid repair construction method for underwater pipeline leakage according to claim 1, characterized in that in the step (3), the rubber layer and the metal coil layer are sequentially coated on the to-be-poured area on the pipeline, and after the periphery is fastened by a hoop, a sheath is installed for pouring.

4. The novel construction method for rapidly repairing the leakage of the underwater pipeline according to claim 1, wherein the mixing method of the polymer resin concrete comprises the following steps: adding the well-stirred polymer resin matrix into the accelerant according to the proportion, uniformly stirring, adding the initiator, uniformly stirring, pouring the mixture into the dried pebbles, the sands and the cement which are uniformly mixed in advance, and uniformly stirring again to obtain the polymer resin concrete.

5. The construction method for rapidly repairing the leakage of the underwater pipeline according to claim 1, wherein the epoxy resin is a composition of bisphenol A epoxy resin and a reactive diluent.

6. The construction method for rapidly repairing the leakage of the underwater pipeline according to claim 1, wherein the initiator is an azo initiator or an organic peroxide initiator.

7. The novel construction method for rapidly repairing the leakage of the underwater pipeline as claimed in claim 6, wherein the initiator is a microcapsule initiator using polyurethane as a wall material and azodiisobutyronitrile as a core material.

8. The novel construction method for rapidly repairing the leakage of the underwater pipeline according to claim 7, wherein the microcapsule initiator is prepared by the following steps:

mixing isophorone diisocyanate and azobisisobutyronitrile according to a molar mixing ratio of 3-4:1, adding 0.5-1% of amphoteric surfactant into 1-2% of polyvinyl alcohol aqueous solution as an oil phase system, and adding the oil phase system and the water phase system according to a volume ratio of 1: (0.4-0.6), rapidly stirring at 6000-8000rpm for 5min, dropwise adding dibutyltin dilaurate with the volume of 0.01 percent of the mixed system, magnetically stirring at the constant temperature of 60-70 ℃ for reaction for 2-3h, separating insoluble substances after the reaction is finished, washing and drying to obtain the microcapsule initiator.

Technical Field

The invention relates to the technical field of underwater pipeline repair, in particular to a novel construction method for quickly repairing leakage of an underwater pipeline.

Background

Leakage of the underwater line not only causes waste but also causes environmental pollution. Taking an offshore oil platform caisson pipe as an example, the caisson pipe can be corroded by seawater and then perforated and leaked, thereby polluting the marine environment. If the leaking part is on water, the leaking part can be repaired by using common repairing materials, but an effective repairing method is still lacked for the pipeline under water, and the pipeline under water is generally treated by only adopting a temporary method, such as wrapping and covering, so that the leakage can be slowed down, and the leakage problem cannot be solved. There is a need for a rapid underwater leak repair technique to solve the problem of leakage in underwater pipelines and to solve the potential safety hazard caused by thinning of the pipe wall.

Disclosure of Invention

Aiming at the problems, the invention provides a novel construction method for quickly repairing leakage of an underwater pipeline.

The purpose of the invention is realized by adopting the following technical scheme:

a novel construction method for rapidly repairing leakage of an underwater pipeline comprises the following steps:

(1) positioning and cleaning foundation for leakage part

After the leakage position is found out, the leakage position and the peripheral area are integrally cleaned by a high-pressure water gun, surface sundries are removed, and the base of the bottom of the leakage position of the pipeline is cleaned within a certain range;

(2) sheath installation

Installing a U-shaped steel sheath in a to-be-poured area of the pipeline, wherein side plates are arranged on the front and the back of the top of the U-shaped steel sheath, a cover plate is arranged on the top of the U-shaped steel sheath, and after the U-shaped steel sheath is installed, a large amount of stones are thrown below the underwater pipeline and the U-shaped steel sheath, so that the underwater pipeline and the U-shaped steel sheath are in a stable fixed state;

(3) irrigation repair

Pouring the mixed polymer resin concrete into the U-shaped steel sheath, covering the cover plate after the U-shaped steel sheath is fully poured, fastening, and finishing leakage repair after the poured polymer resin concrete is cured;

the polymer resin concrete comprises a polymer resin matrix, stones, sand, cement, an accelerant and an initiator, and the composition ratio is as follows: 12-20% of polymer resin matrix, 7-15% of cement, 30-40% of stones, 0.07-0.12% of accelerator, 0.07-0.12% of initiator and the balance of sand, wherein the polymer resin matrix is a composition of epoxy resin, polyurethane prepolymer, unsaturated polyester and substituted ethylene;

the epoxy resin is a composition of bisphenol A epoxy resin and a reactive diluent;

the preparation method of the polyurethane prepolymer comprises the following steps: slowly adding diisocyanate with the molar ratio of-NCO/-OH of 2.2 into dehydrated and dried castor oil while stirring, controlling the reaction temperature at 60-70 ℃, stirring for reaction for 1h, and cooling to obtain a polyurethane prepolymer;

preferably, in the step (3), if the leakage position is large, a sheet of sheet iron is required to cover the seam surface before pouring, and then concrete is poured;

more preferably, in the step (3), the rubber layer and the metal coil layer are sequentially coated on the to-be-poured area on the pipeline, and after the periphery of the to-be-poured area is fastened by the hoop, the sheath is installed for pouring.

Preferably, the mixing method of the polymer resin concrete comprises the following steps: adding the well-stirred polymer resin matrix into the accelerant according to the proportion, uniformly stirring, adding the initiator, uniformly stirring, pouring the mixture into the dried pebbles, the sands and the cement which are uniformly mixed in advance, and uniformly stirring again to obtain the polymer resin concrete.

Preferably, the initiator is an azo initiator or an organic peroxy initiator.

More preferably, the initiator is a microcapsule initiator with polyurethane as a wall material and azodiisobutyronitrile as a core material.

Further preferably, the preparation method of the microcapsule initiator comprises the following steps:

mixing isophorone diisocyanate and azobisisobutyronitrile according to a molar mixing ratio of 3-4:1, adding 0.5-1% of amphoteric surfactant into 1-2% of polyvinyl alcohol aqueous solution as an oil phase system, and adding the oil phase system and the water phase system according to a volume ratio of 1: (0.4-0.6), rapidly stirring at 6000-8000rpm for 5min, dropwise adding dibutyltin dilaurate with the volume of 0.01 percent of the mixed system, magnetically stirring at the constant temperature of 60-70 ℃ for reaction for 2-3h, separating insoluble substances after the reaction is finished, washing and drying to obtain the microcapsule initiator.

The invention has the beneficial effects that:

(1) this application realizes that pipeline seepage is restoreed fast under water through the regional installation U shaped steel system sheath of pouring and pouring polymer resin concrete in the planning of seepage pipeline.

(2) The composite of epoxy resin, polyurethane prepolymer, unsaturated polyester and substituted ethylene is used as a polymer resin matrix, and polymers generated after curing are intertwined to form an interpenetrating structure, so that the curing toughness is improved, a certain amount of introduced hydroxyl and isocyanate groups quickly destroy a water film in the infiltration process, water in gaps also participates in the curing reaction of the binder, infiltration and diffusion are smoothly carried out, and interface infiltration is promoted, so that better wet bonding strength is obtained.

(3) By arranging the rubber layer and the metal coil layer on the pipeline, the advantages of good bonding property between the polymer resin concrete and the metal material and high curing strength can be fully exerted, and the repairing effect is greatly improved.

Drawings

The invention is further illustrated by means of the attached drawings, but the embodiments in the drawings do not constitute any limitation to the invention, and for a person skilled in the art, other drawings can be obtained on the basis of the following drawings without inventive effort.

FIG. 1 is a schematic view of the connection of the U-shaped steel sheath with an underwater pipeline;

figure 2 is a schematic view of the underwater pipeline processing before installation of the sheath in embodiment 2.

Reference numerals: 1, -an underwater pipeline; 2-making a sheath by U-shaped steel; 3-side plate; 4-cover plate; 5-a rubber layer; 6-a metal coil layer; 7-a hoop.

Detailed Description

The invention is further described with reference to the following examples.

The embodiment of the application relates to a novel construction method for quickly repairing leakage of an underwater pipeline, which comprises the following steps:

(1) positioning and cleaning foundation for leakage part

After the leakage position is found out, the leakage position and the peripheral area are integrally cleaned by a high-pressure water gun, surface sundries are removed, and the base of the bottom of the leakage position of the pipeline is cleaned within a certain range;

(2) sheath installation

Installing a U-shaped steel sheath in a to-be-poured area of the pipeline, wherein side plates are arranged on the front and the back of the top of the U-shaped steel sheath, a cover plate is arranged on the top of the U-shaped steel sheath, and after the U-shaped steel sheath is installed, a large amount of stones are thrown below the underwater pipeline and the U-shaped steel sheath, so that the underwater pipeline and the U-shaped steel sheath are in a stable fixed state;

(3) irrigation repair

Pouring the mixed polymer resin concrete into the U-shaped steel sheath, covering the cover plate after the U-shaped steel sheath is fully poured, fastening, and finishing leakage repair after the poured polymer resin concrete is cured;

the polymer resin concrete comprises a polymer resin matrix, stones, sand, cement, an accelerant and an initiator, and the composition ratio is as follows: 12-20% of polymer resin matrix, 7-15% of cement, 30-40% of stones, 0.07-0.12% of accelerator, 0.07-0.12% of initiator and the balance of sand, wherein the polymer resin matrix is a composition of epoxy resin, polyurethane prepolymer, unsaturated polyester and substituted ethylene;

the epoxy resin is a composition of bisphenol A epoxy resin and a reactive diluent;

the preparation method of the polyurethane prepolymer comprises the following steps: slowly adding diisocyanate with the molar ratio of-NCO/-OH of 2.2 into dehydrated and dried castor oil while stirring, controlling the reaction temperature at 60-70 ℃, stirring for reaction for 1h, and cooling to obtain the polyurethane prepolymer.

The polymer resin concrete is prepared by using an organic polymer material and cement as cementing materials. Usually, a certain amount of organic high molecular polymer is added while concrete is stirred, hydration of cement and solidification of the polymer are carried out simultaneously, and the polymers and the cement are mutually filled to form an integral structure, but no chemical reaction occurs between the polymers and the cement, and compared with common concrete, the polymer cement concrete has the characteristics of high tensile strength and breaking strength, high solidification speed, good ductility, cohesiveness, impermeability, impact resistance, wear resistance and the like.

The polymer resin concrete is firmly bonded with metal, can carry out rapid repair treatment on an underwater metal pipeline, the underwater bonding process can be divided into two steps, firstly, a cementing material realizes contact wetting on an adherend in water, then, bonding is realized between the cementing material wetted adherend, however, in an underwater environment, water molecules firstly cover a layer of water film on the surface of the adherend, and because of different crude sugar degrees of the surface of a bonded substrate, wetting capacity of small molecular water on an inorganic material, capillary action and the like, the water on the surface of the bonded substrate is difficult to be completely discharged, water molecule penetration is easy to occur on an interface after curing, so that the actual bonding strength is far lower than ideal strength, the application takes the composition of epoxy resin, polyurethane prepolymer, unsaturated polyester and substituted ethylene as a polymer resin matrix, and the polymers generated after curing are mutually wound to form an interpenetrating structure, the curing toughness is improved, a certain amount of hydroxyl and isocyanate groups are introduced, so that a water film is rapidly damaged in the infiltration process, water in gaps participates in the curing reaction of the binder, infiltration and diffusion are smoothly carried out, and interface infiltration is promoted, so that better wet bonding strength is obtained.

The stone and sand are used after being dried, otherwise the performance is affected, the grading of the aggregate can be adjusted according to local conditions, if the sleeve is larger, the particle size of part of the sleeve can be not more than 40mm, generally not more than 10mm, the dosage of the accelerant and the initiator is required to be adjusted according to the temperature, the dosage is required to be reduced when the temperature is higher in summer, and the dosage is required to be increased when the temperature is lower in winter.

Preferably, in the step (3), if the leakage position is large, a sheet of sheet iron is required to cover the seam surface before pouring, and then concrete is poured;

the initial wrapping of the leakage part can prevent poured polymer resin concrete from being extruded into the pipe in a large amount, reduce the pouring amount and avoid the influence of the polymer resin concrete on the pipe;

more preferably, in the step (3), the rubber layer and the metal coil layer are sequentially coated on the to-be-poured area on the pipeline, and after the periphery of the to-be-poured area is fastened by the hoop, the sheath is installed for pouring.

Generally, underwater pipelines need to be subjected to anticorrosion treatment, corrosion-resistant materials are mostly adopted or anticorrosion layers are arranged outside the pipelines, the adhesion between the polymer resin concrete and the corrosion-resistant materials or the anticorrosion layers is inferior to that between the polymer resin concrete and metal materials, and when direct pouring is adopted, a cured adhesion interface is easily damaged by water molecule penetration, so that repair failure occurs; the rubber layer and the metal coil layer are arranged on the pipeline, wherein the rubber layer directly blocks the seam surface, the metal coil layer replaces the surface to be repaired of the underwater pipeline to be in direct contact with the polymer resin concrete, the good bonding performance between the polymer resin concrete and the metal material is exerted to the maximum extent, the rubber layer and the metal coil layer are fastened in a pouring area through the high strength of the cured concrete, the good bonding performance between the polymer resin concrete and the metal material and the high curing strength can be fully exerted, and the repairing effect is greatly improved.

Preferably, the mixing method of the polymer resin concrete comprises the following steps: adding the well-stirred polymer resin matrix into the accelerant according to the proportion, uniformly stirring, adding the initiator, uniformly stirring, pouring the mixture into the dried pebbles, the sands and the cement which are uniformly mixed in advance, and uniformly stirring again to obtain the polymer resin concrete.

Preferably, the initiator is an azo initiator or an organic peroxy initiator.

More preferably, the initiator is a microcapsule initiator with polyurethane as a wall material and azodiisobutyronitrile as a core material.

The polymer resin concrete poured needs to have good fluidity so as to meet construction conditions, realize self leveling and self compaction, and simultaneously needs to be capable of being quickly cured, generally speaking, the curing speed and the concrete consistency can be realized by adjusting the proportion of an accelerant, an initiator and aggregate, but because the curing speed is higher, the viscosity is quickly increased, the fluidity is reduced, and the gypsum performance is reduced, polyurethane is taken as a wall material in the application, the initiator is separated from a polymer resin matrix, when in mixing, microcapsules can be broken under the action of a diluent and shearing force to participate in curing, the cross-linking curing of the concrete during mixing can be slowed down on the basis of not influencing the final curing strength, and the constructability of the concrete is improved; meanwhile, the wall material polyurethane is dispersed in a curing system and is used as a toughening modifier of a cured product, so that the abrasion resistance of the cured product is improved.

Further preferably, the preparation method of the microcapsule initiator comprises the following steps:

mixing isophorone diisocyanate and azobisisobutyronitrile according to a molar mixing ratio of 3-4:1, adding 0.5-1% of amphoteric surfactant into 1-2% of polyvinyl alcohol aqueous solution as an oil phase system, and adding the oil phase system and the water phase system according to a volume ratio of 1: (0.4-0.6), rapidly stirring at 6000-8000rpm for 5min, dropwise adding dibutyltin dilaurate with the volume of 0.01 percent of the mixed system, magnetically stirring at the constant temperature of 60-70 ℃ for reaction for 2-3h, separating insoluble substances after the reaction is finished, washing and drying to obtain the microcapsule initiator.