CN117341214A

CN117341214A - Construction process for pipeline butt joint

Info

Publication number: CN117341214A
Application number: CN202311198228.1A
Authority: CN
Inventors: 谢锋; 张印; 孙尚兴
Original assignee: China Civil Engineering Construction Corp
Current assignee: China Civil Engineering Construction Corp
Priority date: 2023-09-18
Filing date: 2023-09-18
Publication date: 2024-01-05

Abstract

The invention provides a construction process for pipeline butt joint, which comprises the following steps: fixing two-end pipelines to be butted; cutting and sand blasting marks on the butt joint of the pipeline; the pipeline interfaces are bonded, laminated and butted. Aiming at the butt joint construction of nonmetallic pipelines, the butt joint construction process successfully realizes the advantages of high compression resistance, good seepage resistance, good corrosion resistance and convenient construction of the joints between the pipelines when the pipelines are wrapped by concrete, and prolongs the service life of the pipelines.

Description

Construction process for pipeline butt joint

Technical Field

The invention relates to the technical field of pipeline butt joint, in particular to a pipeline butt joint construction process.

Background

Conventional organic nonmetallic material pipelines are generally subjected to joint connection in the form of flange connection, sleeve connection and the like when joint treatment is carried out. However, when the outside of the pipeline needs to be covered by concrete as protection, the requirements of seepage prevention, corrosion prevention and the like at the joint are considered, and the flange connection and the sleeve connection are often not applicable. After long-time use, the pipeline connected in the traditional way can be corroded and leaked at the joint, and the pressure resistance can be greatly reduced. And when the pipeline inlet is connected, the construction is inconvenient due to different construction environments, and the construction efficiency is low.

Disclosure of Invention

The invention aims to overcome the defects of the prior art, and provides a construction process for pipeline butt joint, which aims to solve the problems of unstable connection of pipeline joints, easy corrosion, leakage and poor compression resistance and low construction efficiency in the prior art.

The invention provides a construction process for pipeline butt joint, which comprises the following steps:

step S1: fixing two-end pipelines to be butted;

step S2: cutting and sand blasting marks on the butt joint of the pipeline;

step S3: the pipeline interfaces are bonded, laminated and butted.

Further, the step of fixing the two-end pipes to be butted specifically includes:

step S11: digging a pipeline tunnel;

step S12: uniformly arranging concrete cushion blocks with consistent sizes, and placing the concrete cushion blocks along an underground tunnel;

step S13: and hoisting and placing the pipeline to be butted on the concrete cushion block.

Further, the step of cutting and sand blasting the mark of the pipeline to the interface specifically comprises the following steps:

step S21: marking a sand blasting position;

step S22: wiping the marked part clean, and checking whether oil stains or other chemical products are immersed in the pipe wall;

step S23: performing sand blasting treatment on the pipe joint, and wiping the sand blasting position after sand blasting is finished;

step S24: the pipe wall at the pipe joint is thinned by 6-12mm, the protective coating on the outer side of the pipe wall is removed, and a chamfer angle is formed at the tail end of the joint.

Further, the step of marking the sandblasted location specifically includes:

step S211: calculating a sand blasting length SL according to the pipeline material;

step S212: determining the inclined plane length CL at the joint according to the pressure-bearing strength of the pipe fitting;

step S213: determining the cutting thickness according to the pipe diameter;

step S214: and performing circumferential cutting treatment on the outer wall of the pipeline connecting port.

Further, the step of calculating the sandblasting length SL according to the material of the pipe specifically includes:

determining a butt joint length LV according to the pipeline material;

sandblasted length SL = butted length LV + preset length AL,

wherein the preset length AL is 100mm.

Further, the step of bonding, laminating and butt-jointing the pipeline interface specifically comprises the following steps:

step S31: configuring an adhesive;

step S32: bonding, winding and connecting the pipeline joint by using an adhesive and a glass fiber tape;

step S33: and (5) reinforcing the joint.

Further, the step of bonding, winding and connecting the pipeline joint by using the adhesive and the glass fiber tape specifically comprises the following steps:

step S321: cleaning a polishing part of a pipeline joint, and uniformly smearing adhesive in a gap of the joint;

step S322: bonding and winding the glass fiber coiled tape coated with the adhesive aiming at the joint position until the tail ends of the left inclined surface and the right inclined surface;

step S323: rolling the glass fiber coiled tape wound on the pipe wall by using a roller, and extruding air;

step S324: continuously winding the glass fiber coiled tape tightly on the outer side of the pipe wall for one circle, brushing the outer surface with an adhesive, rolling by using a roller, and repeating the steps until the glass fiber coiled tape fills up the inclined angle surface, wherein the thickness of the treated pipe wall is the same as that of the original pipe wall;

step S325: the glass fiber tape is wound over the entire sandblasted marking area until a raised area is formed.

Further, the step of reinforcing the joint specifically includes:

step S331: closing two ends of the pipeline;

step S332: heating the channel interface region until the adhesive solidifies;

step S333: maintaining the 125 deg. temperature continues to heat the pipe interface region until a smooth connection is made to the pipe interface region.

Further, after the step of reinforcing the joint, the construction process further includes:

step S34: the inner side of the connecting seam is bonded.

Further, the step of bonding the inside of the connecting seam specifically includes:

step S341: bonding and winding the glass fiber tape coated with the adhesive aiming at the joint position;

step S342: rolling the glass fiber coiled tape wound on the pipe wall by using a roller, and extruding air;

step S343: continuously tightly winding the glass fiber coiled tape on the inner wall of the pipe wall, brushing the outer surface of the glass fiber coiled tape with an adhesive, and then rolling by using a handheld roller;

step S344: after the adhesive has set, the joint is heated for 60 minutes by maintaining a temperature of 125 °.

According to the above embodiment, the construction process for pipeline butt joint provided by the invention has the following advantages: in pipeline construction, especially in the pipeline construction of a underpass roadbed, the pipeline is often required to be wrapped by concrete, so that the effect of protecting the pipeline is achieved. The pipeline butt joint method successfully realizes the advantages of high compression resistance, good seepage resistance and corrosion resistance and convenient construction at the joint between pipelines when the pipelines are wrapped by concrete.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the scope of the invention, as claimed.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and, together with the description, serve to explain the principles of the invention.

Fig. 1 is a schematic diagram of a pipeline cutting position in a pipeline butt joint construction process according to the present invention.

Fig. 2 is a schematic diagram of a pipeline interface slope of a pipeline butt joint construction process according to the present invention.

Fig. 3 is a schematic diagram of preliminary bonding connection of pipeline interfaces in a pipeline butt joint construction process provided by the invention.

Fig. 4 is a schematic diagram of flattening a pipeline joint in a pipeline butt joint construction process according to the present invention.

Fig. 5 is a schematic view of the pipe joint of the construction process for butt joint of pipes, which is provided by the invention, externally wound to a protrusion.

Reference numerals illustrate:

1-pipeline, 2-glass fiber coiled tape;

21-filling part, 22-protruding part, 23-in-tube connecting part.

Detailed Description

Various exemplary embodiments of the invention will now be described in detail, which should not be considered as limiting the invention, but rather as more detailed descriptions of certain aspects, features and embodiments of the invention.

It will be apparent to those skilled in the art that various modifications and variations can be made in the specific embodiments of the invention described herein without departing from the scope or spirit of the invention. Other embodiments will be apparent to those skilled in the art from consideration of the specification of the present invention. The specification and examples are exemplary only.

The invention provides a construction process for pipeline butt joint, which provides an implementation method for pipeline butt joint connection, and can ensure that the pipeline joint is not easy to corrode, has good anti-seepage and anti-compression properties and is convenient to construct. In a specific embodiment of the construction process, the construction process comprises:

step S1: and fixing the pipelines at two ends which need to be butted. Specifically, firstly, two pipelines to be butted need to be fixed in position, and preparation for butt joint of pipeline interfaces is made.

Step S2: and (5) cutting and sand blasting the butt joint of the pipeline. Specifically, as shown in fig. 1, the joint of the pipeline is cut according to the material and the size of the pipeline 1, and then sand blasting marking is performed at the cut. The sand blasting also has the effect of destroying the protective coating on the outer wall of the pipeline, thereby facilitating subsequent adhesive connection.

Step S3: the pipeline interfaces are bonded, laminated and butted. Specifically, the connecting joints are bonded and linked by adopting an adhesive, and then the glass fiber tape with the adhesive is wound at the connecting position of the pipeline for lamination connection. And after the adhesive is cured, the butt joint of the pipelines is realized.

In a specific embodiment of the present invention, the step of fixing the two-end pipes to be butted specifically includes:

step S11: and excavating a pipeline tunnel. Specifically, the tunnel is excavated, and the excavated tunnel bottom is subjected to procedures such as dewatering (if needed), filling and compacting, etc., so that the flatness of the tunnel bottom and the enough compactness are ensured.

Step S12: and uniformly arranging concrete cushion blocks with consistent sizes, and placing the concrete cushion blocks along the tunnel. Specifically, concrete cushion blocks with consistent sizes are placed in the tunnel and are uniformly distributed, the placement at intervals of 4 meters can be considered according to experience, and finally whether the bottoms and the two ends of the lining surfaces of the concrete cushion blocks are branch lines or not is checked, so that the placement is ensured to be neat and consistent.

Step S13: and hoisting and placing the pipeline to be butted on the concrete cushion block. Specifically, two sections of pipelines to be butted are hoisted and placed on the well-arranged concrete cushion blocks, and the gap between the butted ends of the pipelines is not more than 3mm. After the pipeline is placed, checking whether the bottom of the pipeline is in complete contact with the lining surface of the cushion block and whether the cushion block is stable and free of shaking after bearing.

In a specific embodiment of the invention, the step of cutting and sand blasting the mark for the butt joint of the pipeline specifically comprises the following steps:

step S21: marking the sandblasted location. Specifically, the sand blasting length SL in the range of the pipeline joint is determined according to the pipeline material, and marking is carried out.

Step S22: the marked portion is wiped clean and the tube wall is checked for oil or other chemical. In particular, if it is found that the pipe wall is oil-impregnated or other chemical is immersed, the contaminated portion should be excised and sand blast marked again.

Step S23: and (5) carrying out sand blasting on the pipe joint, and wiping the sand blasting position after sand blasting is finished. Specifically, the sand blasting treatment is used for destroying the protective coating on the outer side of the pipe wall, so that the adhesive is convenient for bonding connection.

Step S24: the pipe wall at the pipe joint is thinned by 6-12mm, the protective coating on the outer side of the pipe wall is removed, and a chamfer angle is formed at the tail end of the joint. Specifically, a hand-held grinder is used for grinding the pipe wall at the pipe joint to be 6-12mm, so that the protective coating on the outer side of the pipe wall is thoroughly removed, and a chamfer is ground at the tail end of the joint so as to ensure the lamination butt joint effect. After polishing, floating dust is blown off. In order to ensure the lamination butt joint effect, the interface is prevented from being polluted by impurities such as dust in the air, so that the construction effect is poor, and lamination connection treatment is required within 2 hours after polishing is finished.

Further, the step of marking the sandblasted location specifically includes:

step S211: the blasting length SL is calculated from the pipe material. Specifically, as shown in fig. 1, the lengths of the interfaces of the pipes are different due to different materials of the pipes. According to the pipeline material, the connection length required under different conditions is determined, and then sand blasting marking is carried out on the connection length.

Step S212: and determining the inclined plane length CL at the joint according to the pressure-bearing strength of the pipe fitting. Specifically, as shown in fig. 2, the inclined plane on the outer wall of the pipeline is inclined to the pipeline opening. According to the pressure-bearing strength and the pipe diameter of the pipeline, the length of the inclined plane is different. In addition, the included angle of the inclined plane is 10 degrees plus or minus 2.5 degrees.

The following table is a comparison table of the inclined plane length CL under the conditions of different pipeline bearing strengths and different pipe diameters.

Step S213: and determining the cutting thickness according to the pipe diameter. Specifically, according to the different pipe diameters, the cutting thicknesses are different, and the relation between the cutting thickness and the pipe diameter is shown as the following index;

pipe diameter (mm)	Cutting thickness (mm)
		25-600	6
700-900	8
		1000-1400	12

Step S214: and performing circumferential cutting treatment on the outer wall of the pipeline connecting port. Specifically, according to the obtained sandblasted length SL, inclined plane length CL and cut thickness, circumferential cutting treatment is carried out on the pipeline interface, and the marked sandblasted position is completed.

the abutting length LV is determined according to the pipeline material.

Sandblasted length SL = butted length LV + preset length AL,

wherein the preset length AL is 100mm. Specifically, as shown in fig. 1, the sandblasting length SL is the sum of the abutting length LV and the preset length AL, where the abutting section corresponding to the abutting length LV is close to the pipe joint. The preset length AL is a preset section of the butt-joint section end extending along the pipe axis in a direction away from the pipe joint. Typically, the length of the predetermined segment is 100mm.

In the specific embodiment of the invention, the step of bonding, laminating and butt-jointing the pipeline interfaces specifically comprises the following steps:

step S31: an adhesive is disposed. Specifically, the adhesive is composed of a synthetic resin and a hardener. Before mixing the adhesive, it is checked whether the package of the two reagents is damaged, whether crystals of the reagents are precipitated, etc. The air temperature should be maintained at 20-30 degrees when the synthetic resin and hardener are mixed.

Specifically, small cans of hardener were poured into the synthetic resin and stirred for 3 minutes with the same frequency. After stirring, the mixture should be used as soon as possible. The adhesive pot life varies with temperature. To prevent rapid failure of the adhesive due to excessive air temperature, the adhesive should be kept warm by placing it in water at a suitable temperature.

Step S32: and (3) bonding, winding and connecting the pipeline joint by using an adhesive and a glass fiber tape. Specifically, the gaps between the pipeline connectors are coated with adhesive for connection, and then the glass fiber tape 2 coated with adhesive is wound at the connection part to form a firm connection structure.

Step S33: and (5) reinforcing the joint. Specifically, the adhesive at the joint of the pipeline is cured by using a heating method, so that the joint is reinforced.

In the specific embodiment of the invention, the step of bonding, winding and connecting the pipeline joint by using the adhesive and the glass fiber tape comprises the following steps:

step S321: cleaning the polished part of the pipeline joint and uniformly coating the adhesive in the gap of the joint. Specifically, a proper amount of clear water is dipped in the coarse linen, and the pipeline interface which is cleaned and polished is wetted, so that the adhesiveness of the adhesive is increased. The adhesive is then applied uniformly within the interstices of the interface and onto the fiberglass tape to ensure that the tape is sufficiently saturated with adhesive.

Step S322: and (3) laminating and winding the glass fiber tape coated with the adhesive aiming at the joint position until the tail ends of the left inclined surface and the right inclined surface. Specifically, as shown in fig. 3, the glass fiber tape coated with the adhesive is tightly wound around the joint of the pipeline, and continuously wound around the joint as the center to the tail ends of the left and right inclined planes. In addition, the overlap between the glass fiber tapes must not be less than 75% of the tape width in order to ensure the connection firmness.

Step S323: the roller is used for rolling the glass fiber coiled tape wound on the pipe wall, and air is extruded.

Step S324: and continuously winding the glass fiber coiled tape tightly on the outer side of the pipe wall for one circle, brushing the outer surface with an adhesive, rolling by using a roller, and repeating the steps until the glass fiber coiled tape fills up the inclined angle surface, wherein the thickness of the treated pipe wall is the same as that of the original pipe wall. Specifically, as shown in fig. 4, the glass fiber tape is repeatedly wound at the joint until the concave surface formed by the two inclined planes and the cutting surface outside the inclined planes are filled, so that the thickness of the pipe wall after winding and bonding is ensured to be the same as the thickness of the original pipe wall, namely the diameter of the outer wall of the pipe is the same.

In addition, in order to ensure the firmness of the connection, the lap length of each layer of the glass fiber tape should not be less than half the width of the glass fiber tape.

Step S325: the glass fiber tape is wound over the entire sandblasted marking area until a raised area is formed. Specifically, as shown in fig. 5, a glass fiber tape with an adhesive was wound in the region corresponding to the entire sandblasted mark until the outer wall of the pipe formed a 2cm thick annular protrusion. In addition, the overlap of the glass fiber tape should not be less than 25% of the tape width in order to secure the connection.

In a specific embodiment of the present invention, the step of reinforcing the joint specifically includes:

step S331: and sealing two ends of the pipeline. In particular, the ends of the pipe are closed to avoid temperature drop due to ventilation in the pipe during reinforcement.

Step S332: the channel interface region is heated until the adhesive sets. Specifically, to accelerate the adhesive setting, the interface may be heated to 60 ° with a heat gun until the adhesive is completely set. The heating should be kept uninterrupted during the heating to avoid the generation of bubbles.

Step S333: maintaining the 125 deg. temperature continues to heat the pipe interface region until a smooth connection is made to the pipe interface region. Specifically, after the adhesive was completely cured, heating was continued for 45 minutes, and the temperature was maintained at 125 °. Heating is continued until a smooth joint is formed at the joint, consistent with the outer wall of the tube. In addition, a heating blanket may be used for heating. During heating, the moving pipe is strictly forbidden. After heating, the mixture was allowed to cool naturally.

In a specific embodiment of the present invention, after the step of reinforcing the joint, the construction process further includes:

step S34: the inner side of the connecting seam is bonded. Specifically, when the diameter of the pipeline is large, the pipeline needs to be accessed, the inner side of the connecting seam is connected through the adhesive and the glass fiber tape, the connection strength of the connecting seam is improved, and the leakage is avoided as much as possible. When the pipe diameter is smaller, the pipe is difficult to enter the pipeline, and the bonding treatment can not be carried out at the connecting joint of the pipeline.

In a specific embodiment of the present invention, the step of bonding the inside of the connecting seam specifically includes:

step S341: and (3) aligning the glass fiber tape coated with the adhesive to the joint position for laminating and winding. Specifically, as shown in fig. 5, the pipe inner wall is bonded at the butt joint by a glass fiber tape coated with an adhesive to form an in-pipe joint 23.

Step S342: the roller is used for rolling the glass fiber coiled tape wound on the pipe wall, and air is extruded.

Step S343: continuously winding the glass fiber coiled tape tightly on the inner wall of the pipe wall, brushing the adhesive on the outer surface of the glass fiber coiled tape, and then rolling by using a handheld roller.

The foregoing is merely illustrative of the embodiments of this invention and any equivalent and equivalent changes and modifications can be made by those skilled in the art without departing from the spirit and principles of this invention.

Claims

1. The construction process for the butt joint of the pipelines is characterized by comprising the following steps of:

fixing two-end pipelines to be butted;

cutting and sand blasting marks on the butt joint of the pipeline;

the pipeline interfaces are bonded, laminated and butted.

2. The pipeline butt joint construction process according to claim 1, wherein the step of fixing the two-end pipes to be butt-joined specifically comprises:

digging a pipeline tunnel;

uniformly arranging concrete cushion blocks with consistent sizes, and placing the concrete cushion blocks along an underground tunnel;

and hoisting and placing the pipeline to be butted on the concrete cushion block.

3. The construction process for pipeline butt joint according to claim 1, wherein the steps of pipeline butt joint cutting and sand blasting marking specifically comprise:

marking a sand blasting position;

wiping the marked part clean, and checking whether oil stains or other chemical products are immersed in the pipe wall;

performing sand blasting treatment on the pipe joint, and wiping the sand blasting position after sand blasting is finished;

the pipe wall at the pipe joint is thinned by 6-12mm, the protective coating on the outer side of the pipe wall is removed, and a chamfer angle is formed at the tail end of the joint.

4. A construction process for butt joint of pipelines according to claim 3, wherein the step of marking the sandblasted location comprises:

calculating a sand blasting length SL according to the pipeline material;

determining the inclined plane length CL at the joint according to the pressure-bearing strength of the pipe fitting;

determining the cutting thickness according to the pipe diameter;

and performing circumferential cutting treatment on the outer wall of the pipeline connecting port.

5. The construction process for butt joint of pipelines according to claim 4, wherein the step of calculating the blasting length SL based on the material of the pipeline comprises:

determining a butt joint length LV according to the pipeline material;

sandblasted length SL = butted length LV + preset length AL,

wherein the preset length AL is 100mm.

6. The construction process for pipeline butt joint according to claim 1, wherein the step of bonding and laminating the pipeline interface comprises the following steps:

configuring an adhesive;

bonding, winding and connecting the pipeline joint by using an adhesive and a glass fiber tape;

and (5) reinforcing the joint.

7. The construction process for butt joint of pipelines according to claim 6, wherein the step of bonding, winding and connecting the pipe joints by using the adhesive and the glass fiber tape comprises the steps of:

cleaning a polishing part of a pipeline joint, and uniformly smearing adhesive in a gap of the joint;

bonding and winding the glass fiber coiled tape coated with the adhesive aiming at the joint position until the tail ends of the left inclined surface and the right inclined surface;

rolling the glass fiber coiled tape wound on the pipe wall by using a roller, and extruding air;

continuously winding the glass fiber coiled tape tightly on the outer side of the pipe wall for one circle, brushing the outer surface with an adhesive, rolling by using a roller, and repeating the steps until the glass fiber coiled tape fills up the inclined angle surface, wherein the thickness of the treated pipe wall is the same as that of the original pipe wall;

the glass fiber tape is wound over the entire sandblasted marking area until a raised area is formed.

8. The construction process for butt joint of pipelines according to claim 6, wherein the step of reinforcing the joint comprises:

closing two ends of the pipeline;

heating the channel interface region until the adhesive solidifies;

maintaining the 125 deg. temperature continues to heat the pipe interface region until a smooth connection is made to the pipe interface region.

9. The construction process for butt joint of pipelines according to claim 6, further comprising, after the step of reinforcing the joint:

the inner side of the connecting seam is bonded.

10. The construction process for butt joint of pipelines according to claim 9, wherein the step of bonding the inside of the joint line comprises:

bonding and winding the glass fiber tape coated with the adhesive aiming at the joint position;

continuously tightly winding the glass fiber coiled tape on the inner wall of the pipe wall, brushing the outer surface of the glass fiber coiled tape with an adhesive, and then rolling by using a handheld roller;

after the adhesive has set, the joint is heated for 60 minutes by maintaining a temperature of 125 °.