CN110630822A

CN110630822A - Oil-gas multiphase flow multi-cavity heat-preservation combined pipeline structure system and construction method

Info

Publication number: CN110630822A
Application number: CN201910879125.9A
Authority: CN
Inventors: 张云峰; 计静; 马令勇; 杨毛毛; 李岩; 刘迎春
Original assignee: Northeast Petroleum University
Current assignee: Northeast Petroleum University
Priority date: 2019-09-18
Filing date: 2019-09-18
Publication date: 2019-12-31
Anticipated expiration: 2039-09-18
Also published as: CN110630822B

Abstract

A multi-cavity heat-preservation combined pipeline structure system with oil-gas multiphase flow and a construction method relate to the technical field of pipelines and are formed by sequentially connecting three pipelines through GFRP anti-buckling energy dissipation dampers, the axes of the three pipelines are sequentially connected to form an equilateral triangle, each pipeline comprises a pipeline monomer and an integral node, and the pipeline monomer comprises an outer-layer GFRP circular pipe, an inner-layer GFRP circular pipe, a self-compaction fine stone concrete layer and a heat preservation plate; the outer wall of the outer layer GFRP circular pipe is provided with an outer layer GFRP circular pipe reserved bolt hole; the two pipeline monomers are connected through an integral node, and the outer wall of the integral node is provided with concrete pouring holes and exhaust holes which are distributed at intervals. The oil-gas multi-phase flow multi-cavity heat-preservation combined pipeline structure system and the construction method solve the problems of small diameter, poor stability and impermeability, low transportation efficiency, single transportation mode and poor heat preservation performance of transportation media in cold regions of the traditional pipeline.

Description

Oil-gas multiphase flow multi-cavity heat-preservation combined pipeline structure system and construction method

The technical field is as follows:

the invention relates to the technical field of pipelines, in particular to an oil-gas multiphase flow multi-cavity heat-preservation combined pipeline structure system and a construction method.

Background art:

conventional long-distance pipelines are mostly round steel pipe pipelines and reinforced concrete round pipelines, the diameters of the pipelines are mostly within the range of 0.5-1.5 m, one ends of the pipelines adopt the form of enlarged heads, and the pipelines are connected through end sockets. Liquid is conveyed in the steel pipe all the year round, the steel pipe is easy to rust, the effective thickness of the pipe wall can be reduced due to long-term erosion, the rigidity of the pipe wall is reduced, and local buckling is easy to occur under the action of soil and external pressure. Meanwhile, as the inner wall of the pipeline is corroded by liquid, more and more impurities are generated, the quality inspection is difficult to reach the standard, and the pipeline cannot be replaced when the designed service life is reached. The reinforced concrete pipeline is easy to rust under the liquid erosion for a long time, the impermeability of the pipe wall is difficult to ensure, and the leakage phenomenon can be formed for a long time. After the pipeline area experiences slight vibration, the conventional connection of the reinforced concrete pipeline port is easy to loosen, and the tightness of the pipeline is difficult to ensure. Traditional pipeline is mostly the single tube, and the conveying medium is single and conveying efficiency is lower. Later to avoid pipe leakage, steel pipes were placed in the middle of concrete pipes to form built-in steel pipe concrete composite pipes, which, while increasing the rigidity and strength of the pipes, presented a greater challenge to reliable connections between the pipes. In addition, the heat insulation performance of the steel pipelines is poor, and the steel pipelines cannot play a heat insulation effect on transported gas or liquid in cold regions. Later, people began to wrap one deck heated board outside the pipeline, but along with the time, outer heated board suffered destruction gradually to it is more difficult to maintain.

The invention content is as follows:

the invention aims to overcome the defects of the prior art, provides an oil-gas multi-phase flow multi-cavity heat-preservation combined pipeline structure system and a construction method thereof, is used for solving the problems of small diameter, poor stability and impermeability, low transportation efficiency, single transportation mode and poor heat preservation performance of transportation media in cold regions of the traditional pipeline, and also provides the construction method of the oil-gas multi-phase flow multi-cavity heat-preservation combined pipeline structure system.

The technical scheme adopted by the invention is as follows: an oil-gas multiphase flow multi-cavity heat preservation combined pipeline structure system and a construction method are formed by sequentially connecting three pipelines through GFRP anti-buckling energy dissipation dampers, the axes of the three pipelines are sequentially connected to form an equilateral triangle, each pipeline comprises a pipeline monomer and an integral node, the pipeline monomer comprises an outer GFRP circular pipe, an inner GFRP circular pipe, a self-compaction fine stone concrete layer and a heat preservation plate, a plurality of anti-shearing connecting keys are uniformly distributed on the inner wall of the outer GFRP circular pipe in the circumferential direction, the inner GFRP circular pipe surrounds the outer GFRP circular pipe, an interlayer is arranged between the outer GFRP circular pipe and the inner GFRP circular pipe, the heat preservation plate is arranged in the interlayer, the self-compaction fine stone concrete layer is filled between the heat preservation plate and the pipe wall, a plurality of GFRP high-strength bolts are uniformly distributed on the outer wall of the inner GFRP circular pipe in the circumferential direction, the heat preservation plate and the inner GFRP circular pipe, the bolt holes penetrate through the outer layer GFRP circular tube, the inner layer GFRP circular tube, the self-compacting fine stone concrete layer and the heat insulation board; the outer wall of the outer layer GFRP circular pipe is provided with an outer layer GFRP circular pipe reserved bolt hole; through integral nodal connection between two pipeline monomers, integral node is through the bolt hole connection of high strength bolt and two pipeline monomer tip, is equipped with concrete placement hole and exhaust hole on the integral node outer wall, concrete placement hole and exhaust hole interval distribution.

Integral node include outer GFRP pipe, inlayer GFRP pipe, self-compaction pea gravel concrete layer and heated board, outer GFRP pipe inner wall circumference equipartition distributes has a plurality of shear connector, encircles inlayer GFRP pipe in the outer GFRP pipe, is equipped with the intermediate layer between outer GFRP pipe and the inlayer GFRP pipe, is equipped with the heated board in the intermediate layer, is full of self-compaction pea concrete layer between heated board and the pipe wall, the impartial a plurality of GFRP high-strength bolt that distributes of inlayer GFRP pipe outer wall circumference, GFRP high-strength bolt is fixed heated board and inlayer GFRP pipe through two set nut.

The outer diameter of the inner GFRP circular pipe of the integral node is equal to the inner diameter of the inner GFRP circular pipe of the pipeline monomer; the inner diameter of the outer layer GFRP circular pipe of the integral node is equal to the outer diameter of the outer layer GFRP circular pipe of the single pipeline.

Concrete pouring holes and exhaust holes are formed in the outer wall of the outer layer GFRP circular tube of the integral node and are distributed at intervals; concrete pouring holes and exhaust holes are also formed in the heat insulation plates of the integral nodes, and the concrete pouring holes and the exhaust holes are in one-to-one correspondence in the up-down positions.

The single pipeline is a single pipe, and the section of the single pipeline is circular; the outer layer GFRP circular tube and the inner layer GFRP circular tube are seamless winding type GFRP circular tubes.

The pipeline is three pipes, the cross sections of the three pipes are circular, and the centers of the cross sections of the three pipes are sequentially connected to form an equilateral triangle.

The pipeline monomer is one of a linear pipeline monomer, a curved pipeline monomer or a crossing pipeline monomer.

The lateral surface of the pipeline monomer is horizontally and symmetrically provided with GFRP anti-buckling energy dissipation dampers, one ends of the GFRP anti-buckling energy dissipation dampers are connected with the outer wall of the pipeline monomer through claw-type connecting pieces, and the other ends of the GFRP anti-buckling energy dissipation dampers are hinged with the foundation; one end of the claw type connecting piece is provided with a circular ring and is hinged with the GFRP buckling-restrained energy dissipation damper, the other end of the claw type connecting piece is provided with a reserved bolt hole, and the reserved bolt hole is connected with a reserved bolt hole of an outer-layer GFRP circular tube through a high-strength bolt.

And a GFRP buckling-restrained energy-dissipation damper is arranged between every two of the three pipelines, two ends of the GFRP buckling-restrained energy-dissipation damper are respectively hinged with one end of a claw-type connecting piece, and the other end of the claw-type connecting piece is respectively connected with the reserved bolt holes of the outer layer GFRP circular pipe of the corresponding pipeline monomer through high-strength bolts.

The method comprises the following steps:

1) prefabricating a pipeline monomer in a factory, manufacturing an inner layer GFRP circular pipe, an outer layer GFRP circular pipe and a heat insulation plate according to the size requirement, arranging shear-resistant connecting keys on the inner side of the outer layer GFRP circular pipe according to a certain rule, arranging GFRP high-strength bolts on the outer side of the inner layer GFRP circular pipe according to a certain rule, arranging heat insulation plate bolt holes in advance on the heat insulation plate to enable the positions of the heat insulation plate bolt holes to correspond to the positions of the GFRP high-strength bolts, fixing the heat insulation plate and the inner layer GFRP circular pipe through double positioning nuts, reserving bolt holes at two ends of the inner layer GFRP circular pipe and the heat insulation plate, reserving bolt holes on the outer layer GFRP circular pipe, connecting a claw type connecting piece with the outer layer GFRP circular pipe through the reserved bolt holes on the outer layer GFRP circular pipe and the high-strength bolts, concentrically and vertically placing the fixed inner layer GFRP circular pipe and the heat insulation plate in the outer, A self-compacting fine stone concrete layer is filled between the inner layer GFRP circular tube and the outer layer GFRP circular tube, after the concrete is initially set, the high-strength bolt is loosened and repeatedly twisted to form a bolt hole, and a pipeline single body is formed after maintenance;

2) the method comprises the steps that an inner layer GFRP circular pipe, an outer layer GFRP circular pipe and a heat insulation board for forming an integral node are prefabricated in a factory, a shear-resistant connecting key is arranged on the inner side of the outer layer GFRP circular pipe according to a certain rule, GFRP high-strength bolts are arranged on the inner layer GFRP circular pipe, heat insulation board bolt holes are reserved in the heat insulation board, the positions of the heat insulation board bolt holes and the positions of the GFRP high-strength bolts correspond to each other, the heat insulation board and the inner layer GFRP circular pipe are fixedly connected through double positioning nuts, bolt holes are reserved in two end portions of the inner layer GFRP circular pipe and the outer layer GFRP circular pipe, concrete pouring holes and exhaust holes are reserved in the top of the outer layer;

3) transporting the prefabricated pipe single body and the inner GFRP circular pipe and the outer GFRP circular pipe of the integral node to a site, arranging two pipe single bodies of a lower layer on site soil, then placing the inner GFRP circular pipe of the integral node into the outer GFRP circular pipe, concentrically inserting the inner GFRP circular pipe and the outer GFRP circular pipe into the pipe single body, fixedly connecting the pipe single body and the inner GFRP circular pipe and the outer GFRP circular pipe of the integral node by using a high-strength bolt, then using a concrete pump to pour the stirred self-compacting fine stone concrete into an interlayer between the inner GFRP circular pipe and the outer GFRP circular pipe through a concrete pouring hole, stopping pouring when the concrete at an exhaust hole overflows, sequentially connecting the pipe single bodies through the integral node, connecting the claw type connecting pieces between the two pipes at the lower part by the GFRP anti-buckling energy dissipation damper in a hinged mode, and connecting one end of the GFRP anti-buckling energy dissipation damper for connecting the pipe and the foundation with the circular ring of the claw type connecting pieces, the other end of the pipeline is connected with a foundation, the two ends of the pipeline are hinged, after the bottom GFRP buckling-restrained energy-dissipation damper is completed, the two pipelines are connected with the GFRP buckling-restrained energy-dissipation damper connected with the top pipeline, and then soil is buried to the designed height;

4) arranging an upper layer of pipeline monomer on the field soil after the field is finished, then placing an inner layer GFRP circular pipe of an integral node into an outer layer GFRP circular pipe, concentrically inserting the inner layer GFRP circular pipe and the outer layer GFRP circular pipe into the pipeline monomer, fixedly connecting the pipeline monomer with the inner layer GFRP circular pipe and the outer layer GFRP circular pipe of the integral node by using a high-strength bolt, then using a concrete pump to pour the stirred self-compacting fine stone concrete into an interlayer between the inner layer GFRP circular pipe and the outer layer GFRP circular pipe through a concrete pouring hole, stopping pouring when the concrete at an exhaust hole overflows, sequentially connecting the pipeline monomer through the integral node, connecting two lower pipelines with a GFRP buckling-preventing energy-dissipating damper connected with a top pipeline through claw type connecting pieces in a hinged mode, adopting a construction method of constructing the upper layer of two lower pipelines and then constructing the upper layer of pipelines, and arranging the GFRP buckling-preventing energy-dissipating dampers at intervals along the pipeline, namely, the construction of the oil-gas multiphase flow multi-cavity heat-preservation combined pipeline structure system is completed.

The invention has the beneficial effects that:

1) the assembly type connection of the pipelines is realized by using local cast-in-place self-compacting concrete, the connection mode of the traditional pipeline is changed, the pipeline can have good long-term tightness and is durable, and the requirement of the design service life is met;

2) the combined section form of GFRP and self-compacting concrete is adopted, the mechanical properties of two materials are fully utilized, the bearing capacity and the stability of the pipeline are greatly improved, and the self-compacting concrete is suitable for a conveying pipeline with a large pipe diameter;

3) the GFRP buckling-restrained energy-dissipation damper is adopted, so that the fixing connection effect can be achieved, the energy-dissipation and shock-absorption effects can be achieved during an earthquake, and the anti-seismic performance of the pipeline is improved;

4) three pipelines are adopted to simultaneously convey media, one medium can be conveyed, two or three media can be conveyed simultaneously, conveying modes are enriched, and conveying efficiency is improved;

5) the adopted GFRP circular tube has high tensile strength, light weight, good construction manufacturability, good corrosion resistance, insensitivity to temperature change and good heat insulation property, is convenient to be applied in high-stringency cold regions and saline-alkali regions, can convey liquid and gas which cannot be conveyed by a steel pipeline, and simultaneously ensures the stability of a conveyed medium;

6) the heat preservation plate is arranged between the inner GFRP circular tube and the outer GFRP circular tube, so that the heat preservation effect on gas or liquid transported in a severe cold area can be achieved, and the mobility of a transport medium is kept;

7) the pipeline has strong applicability, can be arranged in a straight line, a curve and a crossing way, solves the problem of limitation of the traditional pipeline, can be buried underground or arranged on the ground, can be flexibly arranged aiming at complex terrains, and can avoid mountains, rivers and the like;

8) the inner surface of the pipeline is smooth, the resistance to the conveying medium is small, the deposited medium is relatively less, and the conveying efficiency of the pipeline can be greatly improved;

9) the single pipeline and the integral node can be prefabricated in a factory and installed on site, so that the construction period is greatly shortened;

10) the pipeline has good waterproof performance and strong freeze-thaw resistance in the underground complex environment, can obviously improve the fatigue resistance of the pipeline and meet the requirement of the design service life.

Description of the drawings:

FIG. 1 is a schematic view of a pipe connection structure of a linear pipe cell according to the present invention;

FIG. 2 is a schematic view showing a pipe connection structure of a single curved pipe according to the present invention;

FIG. 3 is a schematic view of a pipe connection structure of the crossing type pipe unit according to the present invention;

FIG. 4 is a schematic cross-sectional view of a single pipe of the present invention

FIG. 5 is a schematic cross-sectional view of a three-tube configuration of the present invention;

FIG. 6 is a cross-sectional view of the connection and fixation of the single pipe body with the integral node of the un-poured concrete according to the present invention;

FIG. 7 is a sectional view of the pipe unit of the present invention attached to a cast concrete integral joint;

FIG. 8 is a schematic cross-sectional view of an outer GFRP tube of the integral node of the invention;

FIG. 9 is a schematic cross-sectional view of an outer GFRP tube of the integral node of the invention;

FIG. 10 is a schematic cross-sectional view of an inner GFRP tubular of the integral node of the invention;

FIG. 11 is a schematic cross-sectional view of an inner GFRP tubular of the integral node of the invention;

FIG. 12 is a schematic cross-sectional view of the connection of a single curved pipe and an integral joint according to the present invention;

FIG. 13 is a cross-sectional view of the cross-over type pipe monolith and integral node connection of the present invention;

FIG. 14 is a schematic view of the outer layer GFRP circular tube preformed bolt hole structure of the single pipe body of the invention;

FIG. 15 is a schematic view of the claw coupling of the present invention;

FIG. 16 is a cross-sectional view of the jaw connection of the present invention;

fig. 17 is a schematic view of the GFRP energy-dissipating buckling restraint of the present invention.

The specific implementation mode is as follows:

referring to the figures, an oil-gas multiphase flow multi-cavity heat preservation combined pipeline structure system and a construction method are formed by sequentially connecting three pipelines through GFRP anti-buckling energy dissipation dampers 17, the axes of the three pipelines are sequentially connected to form an equilateral triangle, each pipeline comprises a pipeline monomer 1 and an integral node 4, the pipeline monomer 1 comprises an outer GFRP circular pipe 12, an inner GFRP circular pipe 13, a self-compaction fine stone concrete layer 15 and a heat preservation plate 14, a plurality of anti-shearing connecting keys 5 are uniformly distributed on the inner wall of the outer GFRP circular pipe 12 in the circumferential direction, the inner GFRP circular pipe 13 is surrounded by the outer GFRP circular pipe 12, an interlayer is arranged between the outer GFRP circular pipe 12 and the inner GFRP circular pipe 13, the heat preservation plate 14 is arranged in the interlayer, the self-compaction fine stone concrete layer 15 is filled between the heat preservation plate 14 and the pipe wall, a plurality of GFRP high-strength bolts 7 are uniformly distributed on the outer wall of the inner GFRP circular pipe 13 in the circumferential direction, the GF, the two end parts of the pipeline monomer 1 are respectively provided with bolt holes 6, and the bolt holes 6 penetrate through an outer layer GFRP circular pipe 12, an inner layer GFRP circular pipe 13, a self-compacting fine stone concrete layer 15 and a heat insulation board 14; the outer wall of the outer layer GFRP circular pipe 12 is provided with an outer layer GFRP circular pipe reserved bolt hole 19; connect through integral node 4 between two pipeline monomers 1, integral node 4 is connected through the bolt hole 6 of high strength bolt 8 with two pipeline monomer 1 tip, is equipped with concrete placement hole 10 and exhaust hole 11 on the 4 outer walls of integral node, and concrete placement hole 10 and exhaust hole 11 interval distribution. The integral type node 4 comprises an outer layer GFRP circular pipe 12, an inner layer GFRP circular pipe 13, a self-compaction fine stone concrete layer 15 and a heat insulation board 14, a plurality of shear connection keys 5 are evenly distributed on the inner wall of the outer layer GFRP circular pipe 12 in the circumferential direction, the inner layer GFRP circular pipe 13 surrounds the outer layer GFRP circular pipe 12 in the circumferential direction, an interlayer is arranged between the outer layer GFRP circular pipe 12 and the inner layer GFRP circular pipe 13, the heat insulation board 14 is arranged in the interlayer, the self-compaction fine stone concrete layer 15 is filled between the heat insulation board 14 and the pipe wall, a plurality of GFRP high-strength bolts 7 are evenly distributed on the outer wall of the inner layer GFRP circular pipe 13 in the circumferential direction, and the GFRP high-strength bolts 7 fix. The outer diameter of the inner GFRP circular tube 13 of the integral node 4 is equal to the inner diameter of the inner GFRP circular tube 13 of the pipeline monomer 1; the inner diameter of the outer GFRP circular tube 12 of the integral node 4 is equal to the outer diameter of the outer GFRP circular tube 12 of the single pipeline 1. Concrete pouring holes 10 and exhaust holes 11 are formed in the outer wall of an outer GFRP circular tube 12 of the integral node 4, and the concrete pouring holes 10 and the exhaust holes 11 are distributed at intervals; the heat insulation plate 14 of the integral node 4 is also provided with concrete pouring holes 10 and exhaust holes 11, and the concrete pouring holes 10 correspond to the exhaust holes 11 in the vertical position one by one. The single pipeline 1 is a single pipe with a circular section; the outer layer GFRP circular tube 12 and the inner layer GFRP circular tube 13 are seamless winding type GFRP circular tubes. The pipeline is three pipes, the cross sections of the three pipes are circular, and the centers of the cross sections of the three pipes are sequentially connected to form an equilateral triangle. The pipeline monomer 1 is one of a linear pipeline monomer, a curved pipeline monomer 2 or a crossing pipeline monomer 3. The lateral surface of the pipeline single body 1 is horizontally and symmetrically provided with GFRP anti-buckling energy dissipation dampers 17, one end of each GFRP anti-buckling energy dissipation damper 17 is connected with the outer wall of the pipeline single body 1 through a claw type connecting piece 16, and the other end of each GFRP anti-buckling energy dissipation damper 17 is hinged with a foundation 18. One end of the claw type connecting piece 16 is provided with a circular ring and is hinged with the GFRP anti-buckling energy dissipation damper 17, the other end of the claw type connecting piece 16 is provided with a reserved bolt hole, and the reserved bolt hole is connected with an outer layer GFRP circular pipe reserved bolt hole 19 through a high-strength bolt 8. And a GFRP buckling-restrained energy-dissipation damper 17 is arranged between every two of the three pipelines, two ends of the GFRP buckling-restrained energy-dissipation damper 17 are respectively hinged with one end of a claw-type connecting piece 16, and the other end of the claw-type connecting piece 16 is respectively connected with the outer-layer GFRP circular tube reserved bolt hole 19 of the corresponding pipeline single body 1 through a high-strength bolt 8.

The method comprises the following steps:

1) firstly prefabricating a pipeline monomer 1 in a factory, manufacturing an inner layer GFRP circular pipe 13, an outer layer GFRP circular pipe 12 and a heat insulation plate 14 according to the size requirement, arranging a shear connection key 5 on the inner side of the outer layer GFRP circular pipe 12 according to a certain rule, arranging a GFRP high-strength bolt 7 on the outer side of the inner layer GFRP circular pipe 13 according to a certain rule, arranging a heat insulation plate bolt hole on the heat insulation plate 14 in advance to enable the position of the heat insulation plate bolt hole to correspond to the position of the GFRP high-strength bolt 7, fixing the heat insulation plate 14 and the inner layer GFRP circular pipe 13 through a double positioning nut 9, reserving bolt holes 6 at two ends of the inner layer GFRP circular pipe, the outer layer GFRP circular pipe 12, reserving an outer layer GFRP circular pipe reserved bolt hole 19 on the outer layer GFRP circular pipe 12, connecting a claw type connecting piece 16 with the outer layer GFRP circular pipe reserved bolt hole 19 and the high-strength bolt 8, vertically placing the fixed inner, screwing the high-strength bolts 8 at two ends, pouring a self-compacting fine stone concrete layer 15 among the heat preservation plate 14, the inner layer GFRP circular tube 13 and the outer layer GFRP circular tube 12 from top to bottom, loosening and repeatedly twisting the high-strength bolts 8 after the concrete is initially set to form bolt holes 6, and forming the pipeline single body 1 after maintenance;

2) prefabricating an inner layer GFRP circular pipe 13, an outer layer GFRP circular pipe 12 and a heat insulation plate 14 for forming the integral node 4 in a factory, arranging a shear connection key 5 on the inner side of the outer layer GFRP circular pipe 12 according to a certain rule, arranging a GFRP high-strength bolt 7 on the inner layer GFRP circular pipe 13, reserving a heat insulation plate bolt hole on the heat insulation plate 14 to enable the positions of the heat insulation plate bolt hole and the GFRP high-strength bolt 7 to be corresponding, connecting and fixing the heat insulation plate 14 and the inner layer GFRP circular pipe 13 through a double positioning nut 9, reserving bolt holes 6 at two end parts of the inner layer GFRP circular pipe and the outer layer GFRP circular pipe, reserving a concrete pouring hole 10 and an exhaust hole 11 at the top of the outer layer GFRP circular pipe 12 of the integral node 4, and reserving the concrete pouring hole 10;

3) transporting the prefabricated pipe single body 1 and the inner GFRP circular pipe 13 and the outer GFRP circular pipe 12 of the integral node 4 to the site, arranging the two pipe single bodies 1 at the lower layer on the site soil, then placing the inner GFRP circular pipe 13 of the integral node 4 into the outer GFRP circular pipe 12, concentrically inserting the two pipes into the pipe single body 1, fixedly connecting the pipe single body 1 and the inner GFRP circular pipe 13 and the outer GFRP circular pipe 12 of the integral node 4 by using a high-strength bolt 8, then using a concrete pump to fill the stirred self-compacting fine stone concrete into an interlayer between the inner GFRP circular pipe 13 and the outer GFRP circular pipe 12 through a concrete filling hole 10, stopping filling when the concrete at an exhaust hole 11 overflows, sequentially connecting the pipe single bodies 1 through the integral node 4, connecting a claw type connecting piece 16 between the two pipes at the lower part by a GFRP buckling-prevention energy dissipation damper 17, the connection modes are hinged, one end of a GFRP anti-buckling energy-consumption damper 17 for connecting the pipeline and the foundation 18 is connected with the circular ring of the claw-type connecting piece 16, the other end of the GFRP anti-buckling energy-consumption damper is connected with the foundation 18, the connection modes of the two ends are hinged, after the GFRP anti-buckling energy-consumption damper 17 at the bottom layer is completed, the two pipelines and the GFRP anti-buckling energy-consumption damper 17 connected with the top pipeline are connected well, and then the two pipelines are buried to the designed height;

4) after the field is finished, arranging an upper layer of pipeline monomer 1 on the field soil, then placing an inner layer GFRP circular pipe 13 of an integral node 4 into an outer layer GFRP circular pipe 12, inserting the two into the pipeline monomer 1 concentrically, fixedly connecting the pipeline monomer 1 with the inner layer GFRP circular pipe 13 and the outer layer GFRP circular pipe 12 of the integral node 4 by using a high-strength bolt 8, then using a concrete pump to pour the stirred self-compacting fine stone concrete into an interlayer between the inner layer GFRP circular pipe 13 and the outer layer GFRP circular pipe 12 through a concrete pouring hole 10, stopping pouring when the concrete at an exhaust hole 11 overflows, sequentially connecting the pipeline monomer 1 through the integral node 4, connecting two pipelines at the lower part with a GFRP anti-buckling damper 17 connected with a top pipeline through a claw type connecting piece 16 in a hinged mode, and adopting a construction method of constructing the two pipelines at the bottom layer and then constructing the upper layer pipeline, and arranging GFRP anti-buckling energy-dissipation dampers 17 at intervals along the direction of the pipeline, so that the construction of the oil-gas multi-phase flow multi-cavity heat-preservation combined pipeline structure system is completed.

The pipe monomers are organically combined together through the formed integral node. The GFRP anti-buckling energy dissipation damper is symmetrically arranged on the side face of the pipeline monomer at a certain distance, when the pipeline is disturbed by the outside to move, the GFRP anti-buckling energy dissipation damper can stop the movement of the pipeline monomer in real time, the energy of the pipeline monomer is consumed, the pipeline monomer is guaranteed not to be damaged, and when the pipeline vibrates, the damper can play a role in controlling the whole pipeline in real time.

The inner layer GFRP circular pipe and the heat insulation board are concentrically and vertically placed in the outer layer GFRP circular pipe, self-compacting fine stone concrete is poured from top to bottom, a pipeline single body is formed, and connection with an integral node is facilitated.

The pipeline monomer adopts integral nodal connection, fine assurance whole pipeline structure's leakproofness.

The heat preservation plate is arranged to play a heat preservation role in media conveyed in the pipeline, and meanwhile, the heat preservation plate is arranged between the inner layer of GFRP circular pipe and the outer layer of GFRP circular pipe, so that damage cannot occur easily.

The GFRP anti-buckling energy dissipation dampers are horizontally and symmetrically arranged on the side faces of the pipeline, one ends of the GFRP anti-buckling energy dissipation dampers are connected with the single pipeline through claw type connecting pieces, the other ends of the GFRP anti-buckling energy dissipation dampers are connected with the foundation in a hinged mode, and therefore the GFRP anti-buckling energy dissipation dampers can only provide damping force and do not provide redundant restraint. The GFRP anti-buckling energy dissipation damper can play a role in connection and fixation and can play an energy dissipation and shock absorption role in the coming earthquake, and the anti-seismic performance of the single pipeline is greatly improved.

Arranging GFRP anti-buckling energy-dissipation dampers among the three pipelines can play a role in connection and mutual fixation; three pipelines are adopted to simultaneously convey media, one medium can be conveyed, two or three media can be conveyed simultaneously, conveying modes are enriched, and conveying efficiency is improved.

The single pipe body can be one of a straight pipe body, a curved pipe body or a crossing pipe body. The pipeline monomer can arrange in multiple forms, changes the direction of pipeline as required, can avoid complex topography such as mountain range and river, shortens construction cycle greatly.

The pipeline can adopt one or a combination of a plurality of forms of a straight pipeline monomer, a curved pipeline monomer or a crossing pipeline monomer.

Example one

Referring to fig. 1, the oil-gas multiphase flow multi-cavity heat preservation combined pipeline structure system is formed by connecting three pipelines through GFRP buckling-restrained energy dissipation dampers, the three pipelines are arranged on three vertexes of an equilateral triangle, a single pipeline is formed by connecting straight pipeline monomers through integral type nodes, as shown in fig. 4 and 5, each straight pipeline monomer is formed by inner and outer layers of seamless winding type GFRP circular pipes, a heat preservation plate and interlayer self-compaction fine stone concrete, as shown in fig. 8, 9, 10 and 11, GFRP anti-shearing connecting keys are arranged on the inner side of each outer layer of GFRP circular pipe according to a certain rule, GFRP high-strength bolts are arranged on the outer side of each inner layer of GFRP circular pipe according to a certain rule, bolt holes are arranged on the heat preservation plate in advance, the heat preservation plate and the inner layer of GFRP circular pipes are fixed through double positioning nuts, the straight pipeline monomers are connected in situ through the integral type nodes, as shown in fig. 6 and 7, each integral type node is formed by, the integral node of the un-poured concrete is connected and fixed with the two sections of pipeline monomers through the high-strength bolt, and self-compacting fine stone concrete is poured into the fixed connecting node. With reference to fig. 1, GFRP buckling-restrained energy-dissipation dampers are symmetrically arranged between three pipes and outside the pipes at a certain distance, so as to control the displacement deformation of the pipes within an allowable range, thereby ensuring the structural safety and smooth transportation of the pipes. The GFRP circular tube material adopted by the oil-gas multiphase flow multi-cavity heat-preservation combined pipeline structure has high tensile strength, light weight, good construction manufacturability, good corrosion resistance, insensitivity to temperature change and good heat insulation, is convenient to apply in high-stringency cold regions and saline-alkali regions, can convey liquid and gas which cannot be conveyed by a steel pipeline, and simultaneously ensures the stability of a conveyed medium; three pipelines are adopted to transport media simultaneously, so that the conveying mode is enriched and the conveying efficiency is improved.

As shown in fig. 4, bolt holes are reserved at two ends of the inner and outer layers of GFRP round pipes and the insulation board, bolt holes are reserved in the side surface of the outer layer of GFRP round pipe, GFRP high-strength bolts are arranged on the inner layer of GFRP round pipe in advance, bolt holes are reserved in corresponding positions on the insulation board, the insulation board is sleeved on the inner layer of GFRP round pipe to enable the bolt holes to correspond to the positions of the GFRP high-strength bolts on the inner layer of GFRP round pipe, then the insulation board and the inner layer of GFRP round pipe are fixedly connected through mounting nuts, and the claw-type connecting piece is connected with the outer layer. Set up annular baffle in the accurate position of inlayer GFRP pipe and heated board bottom that has fixed, then will fix inlayer GFRP pipe and heated board concentric vertical putting in outer GFRP pipe, from the top down pour into self-compaction pea gravel concrete, form both ends pipeline monomer, be convenient for with being connected of integral node. The large-diameter long-distance heat-insulation combined pipeline has smooth inner surface, small resistance to conveying media and relatively less deposited media, and can greatly improve the conveying efficiency of the pipeline.

As shown in fig. 6 and 7, the integral node is composed of inner and outer layers of GFRP round pipes, a heat-insulating plate and self-compacting fine-stone concrete, GFRP high-strength bolts are arranged on the inner layer of GFRP round pipe in advance, GFRP shear-resistant connecting keys are arranged on the inner side of the outer layer of GFRP round pipe according to a certain rule, bolt holes are reserved on the heat-insulating plate, the bolt holes correspond to the positions of the GFRP high-strength bolts on the inner layer of GFRP round pipe, the heat-insulating plate and the inner layer of GFRP round pipe are fixed through double positioning nuts, the fixed inner layer of GFRP round pipe and heat-insulating plate are placed in the outer layer of GFRP round pipe, the fixed inner layer of GFRP round pipe and heat-insulating plate are connected with a GFRP interlayer self-compacting fine-stone concrete combined pipeline monomer. The pipeline adopts integral nodal connection, fine assurance whole pipeline structure's leakproofness. The assembly type connection of pipelines is realized by local cast-in-place self-compaction fine aggregate concrete, and the connection mode of the traditional pipelines is changed. The pipeline is durable and meets the requirement of the design service life.

As shown in fig. 14, 15, 16 and 17, GFRP buckling-restrained energy-dissipation dampers are arranged between three pipelines and on the outer side of the oil-gas multiphase flow multi-cavity heat-insulation combined pipeline structure, two ends of the GFRP buckling-restrained energy-dissipation dampers between the pipelines are connected with claw-type connecting pieces which are pre-installed on outer GFRP round pipes of the pipelines, and the connecting modes are hinged; one end of a GFRP buckling-restrained energy-dissipation damper horizontally arranged on the outer side of the pipeline is connected with the pipeline through a claw-type connecting piece, the other end of the GFRP buckling-restrained energy-dissipation damper is connected with the foundation, and the two ends of the GFRP buckling-restrained energy-dissipation damper are hinged. The GFRP buckling-restrained energy-dissipation damper can play a role in lateral fixation in an oil-gas multiphase flow multi-cavity heat-preservation combined pipeline structure system, can play a role in energy dissipation and shock absorption during an earthquake, and effectively improves the anti-seismic performance of the pipeline.

The construction method of the oil-gas multiphase flow multi-cavity heat-preservation combined pipeline structure system provided by the embodiment comprises the following steps: the construction method is the construction steps as described above.

Example two

Referring to fig. 2, the oil-gas multiphase flow multi-cavity heat preservation combined pipeline structure system is formed by connecting three pipelines through GFRP buckling-restrained energy dissipation dampers, wherein the three pipelines are arranged on three vertexes of an equilateral triangle. Wherein, the single pipeline is formed by connecting a straight pipeline monomer and a curved pipeline monomer through an integral node, as shown in figure 12, the curved pipeline monomer is formed by an inner layer and an outer layer of seamless winding type GFRP circular pipe, a heat insulation plate and interlayer self-compacting fine stone concrete, as shown in figure 9 and figure 11, GFRP shearing resistant connecting keys are arranged on the inner side of the outer layer GFRP circular pipe according to a certain rule, GFRP high-strength bolts are arranged on the outer side of the inner layer GFRP circular pipe according to a certain rule, bolt holes are prearranged on the heat insulation plate, the heat insulation plate is fixed with the inner layer GFRP circular pipe through double positioning nuts, the straight pipeline monomer and the curved pipeline monomer are connected in site by adopting the integral node, as shown in figure 6 and figure 7, the integral node is formed by the inner layer GFRP circular pipe, the heat insulation plate and the self-compacting fine stone concrete, the GFRP shearing resistant connecting keys are arranged on the inner side of the outer layer GFRP circular pipe according to, the self-compaction fine aggregate concrete composite pipe is characterized in that bolt holes are arranged in advance in the heat insulation plate, the heat insulation plate is fixed with the inner layer GFRP circular pipe through the double positioning nuts, the fixed inner layer GFRP circular pipe and the heat insulation plate are placed into the outer layer GFRP circular pipe, the heat insulation plate and the GFRP interlayer self-compaction fine aggregate concrete composite pipe are connected through the high-strength bolt, and the self-compaction fine aggregate concrete is poured into the fixed integral node without pouring concrete. Referring to fig. 2, GFRP buckling-restrained energy-dissipation dampers are symmetrically arranged between the pipes and outside the pipes at a certain distance, so as to control the displacement deformation of the pipes within an allowable range, thereby ensuring the structural safety and smooth transportation of the pipes. The large-diameter long-distance heat-insulation combined pipeline has strong applicability, the pipeline can be linearly and curvedly arranged and combined, the problem of limitation of the traditional pipeline is solved, the pipeline can be buried underground and can also be arranged on the ground, the pipeline can be flexibly arranged aiming at complex terrains, mountains, rivers and the like can be avoided, and the construction period is greatly shortened.

The construction method of the oil-gas multiphase flow multi-cavity heat-preservation combined pipeline structure system provided by the embodiment comprises the following steps:

at prefabricated bent pipe monomer in mill, according to size requirement to inner curve GFRP pipe, outer curve GFRP pipe and heated board unloading, the inboard at outer GFRP pipe sets up the connection key that shears, set up GFRP high-strength bolt in the outside of inner GFRP pipe, reserve the bolt hole on the heated board, then two set nut connect the heated board fixedly, including, the bolt hole is reserved to two tip of outer GFRP pipe and heated board, reserve the bolt hole on outer GFRP pipe, be connected claw formula connecting piece and outer GFRP pipe through high-strength bolt. The fixed inner layer GFRP circular tube and the fixed heat insulation plate are concentrically placed in the outer layer GFRP circular tube, the high-strength bolts at two ends are screwed, the curved pipeline which is assembled with un-poured concrete is vertically arranged and is reliably fixed, self-compacting fine stone concrete is poured among the heat insulation plate, the inner layer GFRP circular tube and the outer layer GFRP circular tube from the higher end, after the concrete is initially set, the high-strength bolts are loosened and repeatedly twisted to form bolt holes, and a pipeline single body is formed after maintenance. The other construction methods are the same as the first embodiment.

EXAMPLE III

Referring to fig. 3, the oil-gas multiphase flow multi-cavity heat preservation combined pipeline structure system is formed by connecting three pipelines through GFRP buckling-restrained energy dissipation dampers, wherein the three pipelines are arranged on three vertexes of an equilateral triangle. Wherein the single pipeline is formed by connecting a straight pipeline monomer and a crossing pipeline monomer through an integral node, as shown in a combined figure 13, the crossing pipeline monomer is formed by an inner layer and an outer layer of seamless winding type GFRP circular pipe and self-compacting fine stone concrete clamped in a heat-insulating plate, as shown in figures 9 and 11, GFRP shearing-resistant connecting keys are arranged on the inner side of the outer layer GFRP circular pipe according to a certain rule, GFRP high-strength bolts are arranged on the outer side of the inner layer GFRP circular pipe according to a certain rule, the heat-insulating plate is fixed with the inner layer GFRP circular pipe through double positioning nuts, the straight pipeline monomer and the crossing pipeline monomer are connected in situ by adopting the integral node, as shown in figures 6 and 7, the integral node is formed by the inner layer GFRP circular pipe, the outer layer GFRP shearing-resistant connecting keys are arranged on the inner side of the outer layer GFRP circular pipe according to a certain rule, and the GFRP high-strength bolts, fix heated board and inlayer GFRP pipe through two set nut, put outer GFRP pipe with heated board fixed inlayer GFRP pipe in, through high strength bolt with it with GFRP intermediate layer self-compaction pea gravel concreten combination pipeline monomer connection, pour into self-compaction pea gravel concreten in the integral node of the not concrete of fixing. Referring to fig. 3, GFRP buckling-restrained energy-dissipation dampers are symmetrically arranged between the pipes and outside the pipes at a certain distance to control the displacement deformation of the pipes within an allowable range, thereby ensuring the structural safety and smooth transportation of the pipes. The large-diameter long-distance heat-insulation combined pipeline has strong applicability, the pipeline can be arranged linearly, curvedly and in a crossing manner, the problem of limitation of the traditional pipeline is solved, the pipeline can be buried underground and can also be arranged on the ground, the pipeline is flexibly arranged aiming at complex terrains, mountains, rivers and the like can be avoided, and the construction period is greatly shortened.

prefabricated strideing formula pipeline monomer in mill, prefabricated inlayer curve GFRP pipe according to size requirement, outer curve GFRP pipe and heated board, the inboard at outer GFRP pipe sets up the connection key that shears, set up GFRP high-strength bolt in the outside of inlayer GFRP pipe, reserve the bolt hole on the heated board, then two set nut connect the heated board fixedly, including, the bolt hole is reserved to two tip of outer GFRP pipe and heated board, reserve the bolt hole on outer GFRP pipe, be connected claw formula connecting piece and outer GFRP pipe through high-strength bolt. The well-fixed inner-layer GFRP circular pipe and the well-fixed heat-insulation board are concentrically placed in the outer-layer GFRP circular pipe, the high-strength bolts at two ends are screwed, the pipeline is arranged in a concave mode, meanwhile, self-compacting fine stone concrete is filled among the heat-insulation board, the inner-layer GFRP circular pipe and the outer-layer GFRP circular pipe from one side, after the concrete is initially set, the high-strength bolts are loosened and repeatedly twisted to form bolt holes, and a crossing type pipeline monomer is formed after maintenance. The other construction methods are the same as the first embodiment.

In conclusion, the oil-gas multiphase flow multi-cavity heat-preservation combined pipeline structure system and the construction method realize the assembly type connection of the pipelines by using the local cast-in-place self-compacting concrete, change the connection mode of the traditional pipelines, have good long-term tightness and are durable, and meet the requirement of the design service life; the combined section form of GFRP and self-compacting concrete is adopted, the mechanical properties of two materials are fully utilized, the bearing capacity and the stability of the pipeline are greatly improved, and the self-compacting concrete is suitable for a conveying pipeline with a large pipe diameter; the GFRP buckling-restrained energy-dissipation damper is adopted, so that the fixing connection effect can be achieved, the energy-dissipation and shock-absorption effects can be achieved during an earthquake, and the anti-seismic performance of the pipeline is improved; three pipelines are adopted to simultaneously convey media, one medium can be conveyed, two or three media can be conveyed simultaneously, conveying modes are enriched, and conveying efficiency is improved; the adopted GFRP circular tube has high tensile strength, light weight, good construction manufacturability, good corrosion resistance, insensitivity to temperature change and good heat insulation property, is convenient to be applied in high-stringency cold regions and saline-alkali regions, can convey liquid and gas which cannot be conveyed by a steel pipeline, and simultaneously ensures the stability of a conveyed medium; the heat preservation plate is arranged between the inner GFRP circular tube and the outer GFRP circular tube, so that the heat preservation effect on gas or liquid transported in a severe cold area can be achieved, and the mobility of a transport medium is kept; the pipeline has strong applicability, can be arranged in a straight line, a curve and a crossing way, solves the problem of limitation of the traditional pipeline, can be buried underground or arranged on the ground, can be flexibly arranged aiming at complex terrains, and can avoid mountains, rivers and the like; the inner surface of the pipeline is smooth, the resistance to the conveying medium is small, the deposited medium is relatively less, and the conveying efficiency of the pipeline can be greatly improved; the single pipeline and the integral node can be prefabricated in a factory and installed on site, so that the construction period is greatly shortened; the pipeline has good waterproof performance and strong freeze-thaw resistance in the underground complex environment, can obviously improve the fatigue resistance of the pipeline and meet the requirement of the design service life.

Claims

1. A multi-cavity heat-preservation combined pipeline structure system for oil-gas multiphase flow is characterized in that: the anti-bending energy-consumption damper is formed by sequentially connecting three pipelines through GFRP anti-bending energy-consumption dampers (17), the axes of the three pipelines are sequentially connected to form an equilateral triangle, each pipeline comprises a pipeline monomer (1) and an integral node (4), the pipeline monomer (1) comprises an outer GFRP circular pipe (12), an inner GFRP circular pipe (13), a self-compacting fine stone concrete layer (15) and a heat-insulation board (14), a plurality of anti-shearing connecting keys (5) are uniformly distributed on the inner wall of the outer GFRP circular pipe (12) in the circumferential direction, the inner GFRP circular pipe (13) is surrounded in the outer GFRP circular pipe (12), an interlayer is arranged between the outer GFRP circular pipe (12) and the inner GFRP circular pipe (13), the heat-insulation board (14) is arranged in the interlayer, the self-compacting fine stone concrete layer (15) is filled between the heat-insulation board (14) and the pipe wall, and a plurality of GFRP high-strength, the heat-insulating plate (14) is fixed with the inner-layer GFRP circular tube (13) through the GFRP high-strength bolt (7) through the double positioning nuts (9), bolt holes (6) are respectively formed in two end portions of the pipeline single body (1), and the bolt holes (6) penetrate through the outer-layer GFRP circular tube (12), the inner-layer GFRP circular tube (13), the self-compacting fine stone concrete layer (15) and the heat-insulating plate (14); the outer wall of the outer layer GFRP circular pipe (12) is provided with an outer layer GFRP circular pipe reserved bolt hole (19); connect through integral node (4) between two pipeline monomer (1), integral node (4) are connected through bolt hole (6) of high strength bolt (8) and two pipeline monomer (1) tip, are equipped with concrete placement hole (10) and exhaust hole (11) on integral node (4) outer wall, and concrete placement hole (10) and exhaust hole (11) interval distribution.

2. The oil-gas multiphase flow multi-cavity heat-preservation combined pipeline structure system as claimed in claim 1, wherein: integral node (4) including outer GFRP pipe (12), inlayer GFRP pipe (13), self-compaction pea gravel concrete layer (15) and heated board (14), outer GFRP pipe (12) inner wall circumference equipartition distributes has a plurality of shear connector (5), outer GFRP pipe (12) inner ring is around inlayer GFRP pipe (13), be equipped with the intermediate layer between outer GFRP pipe (12) and inlayer GFRP pipe (13), be equipped with heated board (14) in the intermediate layer, be full of self-compaction pea gravel concrete layer (15) between heated board (14) and the pipe wall, inlayer GFRP pipe (13) outer wall circumference equipartition distribute a plurality of GFRP high strength bolt (7), GFRP high strength bolt (7) are fixed heated board (14) and inlayer GFRP pipe (13) through two set nut (9).

3. The oil-gas multiphase flow multi-cavity heat-preservation combined pipeline structure system as claimed in claim 2, wherein: the outer diameter of the inner GFRP circular tube (13) of the integral node (4) is equal to the inner diameter of the inner GFRP circular tube (13) of the pipeline single body (1); the inner diameter of the outer GFRP circular tube (12) of the integral node (4) is equal to the outer diameter of the outer GFRP circular tube (12) of the pipeline single body (1).

4. The oil-gas multiphase flow multi-cavity heat-preservation combined pipeline structure system as claimed in claim 2, wherein: concrete pouring holes (10) and exhaust holes (11) are formed in the outer wall of an outer GFRP circular pipe (12) of the integral node (4), and the concrete pouring holes (10) and the exhaust holes (11) are distributed at intervals; concrete pouring holes (10) and exhaust holes (11) are also formed in the heat insulation plates (14) of the integral nodes (4), and the concrete pouring holes (10) and the exhaust holes (11) are in one-to-one correspondence in the upper and lower positions.

5. The oil-gas multiphase flow multi-cavity heat-preservation combined pipeline structure system as claimed in claim 1, wherein: the single pipeline (1) is a single pipe with a circular section; the outer layer GFRP circular tube (12) and the inner layer GFRP circular tube (13) are seamless winding type GFRP circular tubes.

6. The oil-gas multiphase flow multi-cavity heat-preservation combined pipeline structure system as claimed in claim 1, wherein: the pipeline is three pipes, the cross sections of the three pipes are circular, and the centers of the cross sections of the three pipes are sequentially connected to form an equilateral triangle.

7. The oil-gas multiphase flow multi-cavity heat-preservation combined pipeline structure system as claimed in claim 1, wherein: the pipeline monomer (1) is one of a linear pipeline monomer, a curved pipeline monomer (2) or a crossing pipeline monomer (3).

8. The oil-gas multiphase flow multi-cavity heat-preservation combined pipeline structure system as claimed in claim 1, wherein: GFRP anti-buckling energy-dissipation dampers (17) are horizontally and symmetrically arranged on the side face of the pipeline single body (1), one end of the GFRP anti-buckling energy-dissipation damper (17) is connected with the outer wall of the pipeline single body (1) through a claw-type connecting piece (16), and the other end of the GFRP anti-buckling energy-dissipation damper (17) is hinged with a foundation (18); one end of the claw type connecting piece (16) is provided with a circular ring and is hinged with the GFRP buckling-restrained energy dissipation damper (17), the other end of the claw type connecting piece (16) is provided with a reserved bolt hole, and the reserved bolt hole is connected with an outer layer GFRP circular tube reserved bolt hole (19) through a high-strength bolt (8).

9. The oil-gas multiphase flow multi-cavity heat-preservation combined pipeline structure system as claimed in claim 1, wherein: and a GFRP buckling-restrained energy-dissipation damper (17) is arranged between every two of the three pipelines, two ends of the GFRP buckling-restrained energy-dissipation damper (17) are respectively hinged with one end of a claw-type connecting piece (16), and the other end of the claw-type connecting piece (16) is respectively connected with an outer layer GFRP circular tube reserved bolt hole (19) of the corresponding pipeline single body (1) through a high-strength bolt (8).

10. The construction method of the oil-gas multiphase flow multi-cavity heat-preservation combined pipeline structure system according to claim 1, characterized by comprising the following steps of: the method comprises the following steps:

firstly, prefabricating a pipeline monomer (1) in a factory, manufacturing an inner layer GFRP circular pipe (13), an outer layer GFRP circular pipe (12) and a heat-insulating plate (14) according to size requirements, arranging shear connection keys (5) on the inner side of the outer layer GFRP circular pipe (12) according to a certain rule, arranging GFRP high-strength bolts (7) on the outer side of the inner layer GFRP circular pipe (13) according to a certain rule, arranging heat-insulating plate bolt holes in advance on the heat-insulating plate (14) to enable the positions of the heat-insulating plate bolt holes and the positions of the GFRP high-strength bolts (7) to correspond, fixing the heat-insulating plate (14) and the inner layer GFRP circular pipe (13) through double positioning nuts (9), reserving bolt holes (6) at two ends of the inner layer GFRP circular pipe, the outer layer GFRP circular pipe and the heat-insulating plate (14), reserving bolt holes (19) on the outer layer GFRP circular pipe (12), and connecting a claw type connecting piece (16) with the, the well-fixed inner layer GFRP circular tube (13) and the heat insulation plate (14) are concentrically and vertically placed in the outer layer GFRP circular tube (12), the high-strength bolts (8) at two ends are screwed, a self-compaction fine stone concrete layer (15) is filled among the heat insulation plate (14), the inner layer GFRP circular tube (13) and the outer layer GFRP circular tube (12) from top to bottom, after the concrete is initially set, the high-strength bolts (8) are loosened and repeatedly twisted to form bolt holes (6), and a pipeline single body (1) is formed after maintenance;

an inner layer GFRP circular tube (13), an outer layer GFRP circular tube (12) and a heat insulation plate (14) for forming the integral node (4) are prefabricated in a factory, the inner side of the outer GFRP circular tube (12) is provided with shear connection keys (5) according to a certain rule, a GFRP high-strength bolt (7) is arranged on the inner layer GFRP circular tube (13), the heat insulation plate bolt holes are reserved on the heat insulation plate (14) to enable the positions of the heat insulation plate bolt holes to correspond to the positions of the GFRP high-strength bolts (7), the heat-insulating plate (14) is connected and fixed with the inner layer GFRP circular tube (13) through the double positioning nuts (9), bolt holes (6) are reserved at two ends of the inner and outer GFRP circular tubes, a concrete pouring hole (10) and an exhaust hole (11) are reserved at the top of the outer GFRP circular tube (12) of the integral node (4), reserving concrete pouring holes (10) and exhaust holes (11) at corresponding positions on the heat insulation board (14) at the integral node (4);

transporting the prefabricated pipe single body (1) and the inner GFRP circular pipe (13) and the outer GFRP circular pipe (12) of the integral node (4) to the site, arranging the two pipe single bodies (1) on the site, then placing the inner GFRP circular pipe (13) of the integral node (4) into the outer GFRP circular pipe (12), inserting the pipe single bodies (1) and the inner GFRP circular pipe (13) and the outer GFRP circular pipe (12) of the integral node (4) into the pipe single bodies (1) concentrically, using a high-strength bolt (8) to fixedly connect the pipe single bodies (1) and the inner GFRP circular pipe (13) and the outer GFRP circular pipe (12) of the integral node (4), then using a concrete pump to pour the stirred self-compacting fine stone concrete into an interlayer between the inner GFRP circular pipe (13) and the outer GFRP circular pipe (12) through a concrete pouring hole (10), stopping pouring when the concrete at the exhaust hole (11) overflows, sequentially connecting the pipe single bodies (1) through the integral node (4), connecting a claw type connecting piece (16) between two lower pipelines through a GFRP (glass fiber reinforced plastic) buckling-restrained energy-dissipation damper (17), wherein the connecting modes are hinged, one end of the GFRP buckling-restrained energy-dissipation damper (17) for connecting the pipelines and a foundation (18) is connected with a circular ring of the claw type connecting piece (16), the other end of the GFRP buckling-restrained energy-dissipation damper is connected with the foundation (18), the connecting modes of the two ends are hinged, after the GFRP buckling-restrained energy-dissipation damper (17) at the bottom layer is completed, the two pipelines and the GFRP buckling-restrained energy-dissipation damper (17) connected with the top pipeline are connected, and then the two pipelines are buried to the designed height;

after the field is finished, arranging an upper layer of pipeline monomer (1) on the field soil, then placing an inner layer GFRP circular pipe (13) of an integral node (4) into an outer layer GFRP circular pipe (12), concentrically inserting the inner layer GFRP circular pipe and the outer layer GFRP circular pipe (12) of the integral node (4) into the pipeline monomer (1), fixedly connecting the pipeline monomer (1) and the inner layer GFRP circular pipe (13) and the outer layer GFRP circular pipe (12) of the integral node (4) by using a high-strength bolt (8), then using a concrete pump to pour the stirred self-compacting fine stone concrete into an interlayer between the inner layer GFRP circular pipe (13) and the outer layer GFRP circular pipe (12) through a concrete pouring hole (10), stopping pouring when the concrete at an exhaust hole (11) overflows, sequentially connecting the pipeline monomer (1) through the integral node (4), and connecting two lower pipelines with a GFRP buckling-preventing energy-consuming damper (17) connected with a top pipeline through a claw-type connecting piece (16), the connection modes are hinged, a construction method that two pipelines at the bottom layer are constructed firstly and then an upper layer pipeline is constructed is adopted, and GFRP buckling-restrained energy-dissipation dampers (17) are arranged at intervals along the direction of the pipelines, so that the construction of the oil-gas multiphase flow multi-cavity heat-preservation combined pipeline structure system is completed.