阅读说明：本技术 用于周围赋存高压气体的水下管廊气体泄漏的带压封堵复合结构及封堵方法 (Pressurized plugging composite structure and plugging method for gas leakage of underwater pipe gallery with high-pressure gas around ) 是由 郭成超 王超杰 赵鹏 郝燕洁 孙博 马雪 于 2020-03-23 设计创作，主要内容包括：本发明属于水下管廊泄漏封堵技术领域,涉及一种用于周围赋存高压气体的水下管廊气体泄漏的带压封堵复合结构及封堵方法。该复合结构包括以水下管廊内壁为基底从内到外依次粘贴多层压敏胶带、多层纤维胶带和浸润浸渍胶的碳纤维布形成的防气层、增强层和加固层；所述防气层的厚度不小于0.15mm；所述增强层的厚度不小于1.5~2mm；所述加固层的厚度不小于1.2mm。采用本发明该复合结构进行水下管廊气体泄露封堵,所用材料厚度薄,自重轻,柔韧性较好,形状尺寸可自行裁剪选择,各层之间粘结良好,耐久性优异,保证结构安全。(The invention belongs to the technical field of leakage plugging of an underwater pipe gallery, and relates to a pressurized plugging composite structure and a plugging method for gas leakage of the underwater pipe gallery with high-pressure gas around. The composite structure comprises an air-proof layer, a reinforcing layer and a reinforcing layer, wherein the air-proof layer, the reinforcing layer and the reinforcing layer are formed by sequentially sticking a plurality of layers of pressure-sensitive adhesive tapes, a plurality of layers of fiber adhesive tapes and carbon fiber cloth soaked with impregnating adhesive from inside to outside by taking the inner wall of an underwater pipe gallery as a substrate; the thickness of the air-proof layer is not less than 0.15 mm; the thickness of the enhancement layer is not less than 1.5-2 mm; the thickness of the reinforcing layer is not less than 1.2 mm. The composite structure is adopted to plug gas leakage of the underwater pipe gallery, the used material is thin in thickness, light in dead weight, good in flexibility, capable of being automatically cut and selected in shape and size, good in bonding among layers, excellent in durability and capable of guaranteeing the safety of the structure.)

1. A belt pressure plugging composite structure for gas leakage of an underwater pipe gallery with high-pressure gas around is characterized by comprising a gas-proof layer, a reinforcing layer and a reinforcing layer, wherein the gas-proof layer, the reinforcing layer and the reinforcing layer are formed by sequentially sticking a plurality of layers of pressure-sensitive adhesive tapes, a plurality of layers of fiber adhesive tapes and carbon fiber cloth soaked with impregnating adhesive from inside to outside by taking the inner wall of the underwater pipe gallery as a substrate; the thickness of the air-proof layer is not less than 0.15mm, two sides of the inner pressure-sensitive adhesive tape exceed two sides of the leakage part of the underwater pipe gallery respectively by 0.1-0.5 m, and two sides of the upper pressure-sensitive adhesive tape are widened by 0.05-0.1 m layer by layer; the thickness of the enhancement layer is not less than 1.5-2 mm, two sides of the inner fiber adhesive tape exceed two sides of the outer pressure sensitive adhesive tape respectively by 0.1-0.5 m, and two sides of the upper fiber adhesive tape are widened by 0.05-0.1 m layer by layer; the thickness of the reinforcing layer is not less than 1.2mm, and the two sides of the carbon fiber cloth soaked with the impregnating adhesive exceed the two sides of the outer fiber adhesive tape respectively by 0.05-1 m and surround the inner wall of the underwater pipe gallery by a circle.

2. The plugged composite structure with pressure of claim 1, wherein the pressure sensitive adhesive tape has a tensile strength of not less than 3MPa and a tensile elongation of not less than 350%.

3. The plugged-under-pressure composite structure according to claim 1, wherein the fiber tape has a tensile strength of not less than 200MPa and a tensile elongation of not less than 1%.

4. The pressurized plugging composite structure of claim 1, wherein said carbon fiber cloth impregnated with impregnating gel has a tensile strength of not less than 3400MPa and an elastic modulus of not less than 2.4 × 10⁵MPa, and the tensile rate is not less than 1.7 percent.

5. The method for blocking the gas leakage under pressure of the underwater pipe gallery with the pressure blocking composite structure for the gas leakage of the underwater pipe gallery with the high-pressure gas around the underwater pipe gallery is characterized by comprising the following steps of:

1) substrate treatment: cleaning the inner walls of the pipe pieces within 1m of the left and right leakage parts of the underwater pipe gallery, removing floating slurry and oil stains, or wiping the pipe pieces for 2-3 times by using absorbent cotton dipped with acetone;

2) sticking a pressure-sensitive adhesive tape: adhering multiple layers of pressure sensitive tapes to the leakage part of the underwater pipe gallery to form an air-proof layer, pressing forcibly during adhering to enable the air-proof layer to be tightly attached to the pipe piece, wherein two sides of the inner layer of pressure sensitive tape exceed two sides of the leakage part of the underwater pipe gallery respectively by 0.1-0.5 m, and two sides of the upper layer of pressure sensitive tape are widened by 0.05-0.1 m layer by layer;

3) pasting a fiber tape: adhering a fiber adhesive tape on the air-proof layer to form a reinforcing layer, pressing forcibly during adhering to enable the reinforcing layer to be tightly adhered to the pressure-sensitive adhesive tape, wherein two sides of the inner fiber adhesive tape exceed two sides of the outer pressure-sensitive adhesive tape respectively by 0.1-0.5 m, and two sides of the upper fiber adhesive tape are widened by 0.05-0.1 m layer by layer;

4) pasting carbon fiber cloth: and (3) coating impregnating glue on the carbon fiber cloth to enable the impregnating glue to completely infiltrate the carbon fiber cloth, adhering the infiltrated carbon fiber cloth on the enhancement layer to form a reinforcing layer, wherein two sides of the carbon fiber cloth infiltrated with the impregnating glue exceed two sides of the outer layer fiber adhesive tape respectively by 0.05-1 m and surround the inner wall of the underwater pipe gallery for a circle.

Technical Field

The invention belongs to the technical field of leakage plugging of an underwater pipe gallery, and relates to a pressurized plugging composite structure and a plugging method for gas leakage of the underwater pipe gallery with high-pressure gas around.

Background

With the vigorous development of the infrastructure field in China in recent years, the sea/river-crossing tunnel has great development and application in the traffic construction engineering in China due to the advantages of solving the problem of difficult river-crossing traffic, relieving the traffic pressure of cities, facilitating the communication among the cities, reducing the construction influence, reducing the influence on the shipping, facilitating the maintenance and the like. However, geological conditions of the river/seabed are complex and variable, particularly, part of the river bottom is a soft soil layer rich in high-pressure harmful gas, which has a significant influence on the safety of the tunnel structure, and since the harmful gas in the stratum is difficult to completely remove, air bags with different sizes and higher pressure are distributed around the tunnel structure, if the air bags break, the soft soil body deforms, so that the stratum is unevenly settled, the segment is likely to crack, the joint is opened, and at the moment, the harmful gas such as methane enters the tunnel through the crack, the tube joint and other parts, which is very likely to cause major accidents such as explosion. Although the tunnel is internally provided with safety devices such as intelligent monitoring alarm and exhaust, the leakage part still needs to be blocked and reinforced in time, and methane and the like belong to flammable and explosive toxic gases, so that the mode of no open fire and no emission of high temperature is adopted for blocking in time under pressure. As the leakage position may not be provided with a reserved grouting hole, the leakage position cannot be plugged in a drilling grouting mode, and the pressure of gas at the leakage position is generally more than 1MPa, so that the conventional liquid repairing material can be dispersed after being injected into the leakage position even if the conventional liquid repairing material is cured quickly, and the leakage position is difficult to be plugged effectively. And because the inside section of jurisdiction of tunnel can not be changed, still need strengthen the structure in the fracture department after the shutoff, ensure the long-term structure safety of tunnel.

Disclosure of Invention

The invention aims to provide a pressurized plugging composite structure for gas leakage of an underwater pipe gallery with high-pressure gas around and a plugging method thereof.

In order to achieve the purpose, the invention adopts the following technical scheme:

the invention provides a pressurized plugging composite structure for gas leakage of an underwater pipe gallery with high-pressure gas around, which comprises a gas-proof layer, a reinforcing layer and a reinforcing layer, wherein the gas-proof layer, the reinforcing layer and the reinforcing layer are formed by sequentially sticking a plurality of layers of pressure-sensitive adhesive tapes, a plurality of layers of fiber adhesive tapes and carbon fiber cloth soaked with impregnating adhesive from inside to outside by taking the inner wall of the underwater pipe gallery as a substrate; the thickness of the air-proof layer is not less than 0.15mm, two sides of the inner pressure-sensitive adhesive tape exceed two sides of the leakage part of the underwater pipe gallery respectively by 0.1-0.5 m, and two sides of the upper pressure-sensitive adhesive tape are widened by 0.05-0.1 m layer by layer; the thickness of the enhancement layer is not less than 1.5-2 mm, two sides of the inner fiber adhesive tape exceed two sides of the outer pressure sensitive adhesive tape respectively by 0.1-0.5 m, and two sides of the upper fiber adhesive tape are widened by 0.05-0.1 m layer by layer; the thickness of the reinforcing layer is not less than 1.2mm, and the two sides of the carbon fiber cloth soaked with the impregnating adhesive exceed the two sides of the outer fiber adhesive tape respectively by 0.05-1 m and surround the inner wall of the underwater pipe gallery by a circle.

Further, the tensile strength of the pressure-sensitive adhesive tape is not less than 3MPa, and the tensile rate is not less than 350%.

Further, the tensile strength of the fiber adhesive tape is not less than 200MPa, and the tensile rate is not less than 1%.

Furthermore, the tensile strength of the carbon fiber cloth soaked with the impregnating adhesive is not less than 3400MPa, and the elastic modulus is not less than 2.4 × 10⁵MPa, and the tensile rate is not less than 1.7 percent.

The invention also provides an underwater pipe gallery gas leakage under-pressure plugging method based on the under-pressure plugging composite structure for the underwater pipe gallery gas leakage with high-pressure gas around, which comprises the following steps:

1) substrate treatment: cleaning the inner walls of the pipe pieces within 1m of the left and right leakage parts of the underwater pipe gallery, removing floating slurry and oil stains, or wiping the pipe pieces for 2-3 times by using absorbent cotton dipped with acetone;

2) sticking a pressure-sensitive adhesive tape: adhering multiple layers of pressure sensitive tapes to the leakage part of the underwater pipe gallery to form an air-proof layer, pressing forcibly during adhering to enable the air-proof layer to be tightly attached to the pipe piece, wherein two sides of the inner layer of pressure sensitive tape exceed two sides of the leakage part of the underwater pipe gallery respectively by 0.1-0.5 m, and two sides of the upper layer of pressure sensitive tape are widened by 0.1-0.2 m layer by layer;

3) pasting a fiber tape: adhering a fiber adhesive tape on the air-proof layer to form a reinforcing layer, pressing forcibly during adhering to enable the reinforcing layer to be tightly adhered to the pressure-sensitive adhesive tape, wherein two sides of the inner fiber adhesive tape exceed two sides of the outer pressure-sensitive adhesive tape respectively by 0.1-0.5 m, and two sides of the upper fiber adhesive tape are widened by 0.1-0.2 m layer by layer;

4) pasting carbon fiber cloth: and (3) coating impregnating glue on the carbon fiber cloth to enable the impregnating glue to completely infiltrate the carbon fiber cloth, adhering the infiltrated carbon fiber cloth on the enhancement layer to form a reinforcing layer, wherein two sides of the carbon fiber cloth infiltrated with the impregnating glue exceed two sides of the outer layer fiber adhesive tape respectively by 0.05-1 m and surround the inner wall of the underwater pipe gallery for a circle.

Compared with the prior art, the invention has the beneficial effects that:

the composite structure is adopted for plugging gas leakage of the underwater pipe gallery, the used material is thin in thickness, light in dead weight, good in flexibility, capable of being automatically cut and selected in shape and size, good in bonding among layers and excellent in durability, and the safety of the underwater structure is guaranteed; the construction method is simple to operate and quick in construction, adverse effects such as naked fire and high temperature cannot be caused in the construction process, the structure cannot be affected, and the construction method is particularly suitable for emergency rescue.

Drawings

Fig. 1 is a schematic view of the gas leakage part of an underwater pipe gallery with pressure and the expanded section.

The reference numbers in the drawings: 1 is a duct piece, 2 is a joint, 3 is an air-proof layer, 4 is a reinforcing layer, and 5 is a reinforcing layer.

Detailed Description

The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention. Unless otherwise specified, the technical means used in the examples are conventional means well known to those skilled in the art. The test methods in the following examples are conventional methods unless otherwise specified.

When plugging is carried out, the pressure-sensitive adhesive tape used as the air-proof layer 3 is a 3015# special adhesive tape produced by 3M company, and has the characteristics of good air tightness, 5MPa of tensile strength and 472.96% of tensile rate, wherein ① has good flexibility, the surface of a concrete pipe gallery is uneven under a microscopic angle, so that the adhesive tape with good flexibility can be selected to be tightly attached to the concrete pipe gallery, the adhesive layer on the surface of ② has good wettability and can penetrate into pores in a base material to improve the adhesive strength, ③ has high adhesive strength with the concrete base, ④ has high tensile strength and good ductility, ④ is of a closed-cell structure and can effectively prevent further gas leakage, ⑤ is quick to take effect, can be used after being torn open, and has no curing time.

The fiber tape of the reinforcing layer 4 was 898# tape manufactured by 3M company, tensile strength was 260MPa, and elongation was 1.80%.

The carbon fiber cloth and the impregnating compound of the reinforcing layer 5 are both products produced by Guangzhou Germany administration building science and technology Limited, the model of the fiber cloth is DZH20, the model of the impregnating compound is DZH101, the carbon fiber cloth and the mating impregnating compound have excellent mechanical property after being compounded, the tensile strength exceeds 3400MPa, and the tensile elastic modulus is 2.41 × 10⁵MPa, the tensile rate is 1.70%, the tensile strength of the steel plate is ten times that of the steel plate, the dead weight is light, and the structural load is hardly increased; the elasticity is good, and the material can be flexibly applied to bending resistance, shearing resistance and closed hoop reinforcement; the cutting and lapping can be carried out randomly, the crossing is easy, and the operation can be carried out in a narrow space; the flexibility is good, and the material is suitable for the surfaces of components with various shapes; it is resistant to acid, alkali and salt corrosion and does not need regular maintenance.

The test system adopts a concrete gas permeability test system (Z L201020047017. X), the test system uses methane as a permeation medium to measure the permeability coefficient of the material, the test system adopts the principle that the side surface of a cylindrical or disc-shaped test piece is sealed, stable air pressure is applied to two end surfaces, the gas permeability coefficient of the material is calculated by recording the gas flow under the action of the pressure difference between the two end surfaces, the size of the test piece is 50mm in diameter, and the gas tightness test result of the test piece is shown in Table 1.

TABLE 1 test piece airtightness test measurement results

As can be seen from Table 1, under different permeation pressures, the apparent gas permeability of 2 materials is 0, and the inherent gas permeability of the calculated material is 0, which shows that the material has good gas tightness for methane and can be used for pressurized plugging of gas leakage of an underwater pipe gallery.