CN110630825A

CN110630825A - Oil-gas multiphase flow multi-cavity intelligent heat-insulation pipeline structure and construction method

Info

Publication number: CN110630825A
Application number: CN201910879296.1A
Authority: CN
Inventors: 马令勇; 计静; 张云峰; 姜良芹; 王莉莉; 梁媛
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: CN110630825B

Abstract

An oil-gas multiphase flow multi-cavity intelligent heat preservation pipeline structure and a construction method relate to the technical field of pipelines and are formed by sequentially connecting three pipelines through GFRP buckling-restrained 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-compacting fine stone concrete layer and an annular heat transfer plate; the outer wall of the outer-layer GFRP circular pipe is provided with an outer-layer GFRP circular pipe reserved bolt hole and a heat conduction pipe mounting hole, and the heat conduction pipe mounting hole is connected with the temperature control device through a steel anchor bracket; be equipped with concrete placement hole and exhaust hole on connecting the integral node outer wall through integral node between two pipeline monomers. The oil-gas multiphase flow multi-cavity intelligent heat-insulation pipeline structure and the construction method solve the problems of small diameter, poor stability and impermeability, low conveying efficiency, single conveying mode and poor heat insulation performance of conveying media in severe cold regions of the traditional pipeline.

Description

Oil-gas multiphase flow multi-cavity intelligent heat-insulation pipeline structure 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 intelligent heat-insulation pipeline structure 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. 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 insulate the transported gas or liquid in severe cold areas. Later, people began to wrap the thermal insulation material outside the pipeline, but as time goes on, the outer layer thermal insulation material gradually suffers from the erosion and damage of the environment, so that the maintenance and the replacement are needed irregularly, and the maintenance cost of the pipeline is increased unintentionally. And conventional pipeline structure is mostly the single tube, and the transportation mode is more single to conveying efficiency also can not satisfy the industrial demand gradually.

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 intelligent heat-insulation pipeline structure and a construction method thereof, is used for solving the problems of small diameter, poor stability and impermeability, low conveying efficiency, single conveying mode and poor heat insulation performance of conveying media in severe cold areas of the traditional pipeline, and also provides a construction method of the oil-gas multi-phase flow multi-cavity intelligent heat-insulation pipeline structure system.

The technical scheme adopted by the invention is as follows: an intelligent multi-cavity heat-insulating pipeline structure with multiphase oil-gas flow and a construction method thereof 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-compacting fine stone concrete layer and an annular heat transfer 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 annular heat transfer plate is arranged in the interlayer, the self-compacting fine stone concrete layer is filled between the annular heat transfer 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 annular heat transfer plate and the inner GFRP, 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 annular heat transfer plate; the outer wall of the outer layer GFRP circular pipe is provided with an outer layer GFRP circular pipe reserved bolt hole and a heat conduction pipe mounting hole, a steel anchor frame is mounted outside the heat conduction pipe mounting hole, a temperature control device is arranged on the steel anchor frame, and the temperature control device is connected with the annular heat transfer plate; 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.

The integral type node comprises an outer layer GFRP circular tube, an inner layer GFRP circular tube, a self-compaction pea gravel concrete layer and an annular heat transfer plate, wherein a plurality of shear connection keys are uniformly distributed on the inner wall of the outer layer GFRP circular tube in the circumferential direction, the inner layer GFRP circular tube surrounds the outer layer GFRP circular tube, an interlayer is arranged between the outer layer GFRP circular tube and the inner layer GFRP circular tube, the annular heat transfer plate is arranged in the interlayer, the self-compaction pea gravel concrete layer is filled between the annular heat transfer plate and the tube wall, a plurality of GFRP high-strength bolts are uniformly distributed on the outer wall of the inner layer GFRP circular tube in the circumferential direction, and the GFRP high-strength bolts fix the annular.

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; the annular heat transfer plate of the integral joint is also provided with concrete pouring holes and exhaust holes, and the concrete pouring holes and the exhaust holes are in one-to-one correspondence in the upper and lower positions.

The temperature control device comprises a solar photovoltaic panel, an electric heating converter, a conducting wire and a heat conducting pipe, wherein the solar photovoltaic panel is connected with the electric heating converter through the conducting wire, the electric heating converter is connected with an annular heat transfer plate through the heat conducting pipe, an upper round steel pipe maintenance structure and a lower round steel pipe maintenance structure are sleeved outside the conducting wire and the heat conducting pipe respectively, and the lower round steel pipe maintenance structure is fixed on the outer wall of the pipeline monomer through a steel anchor frame; the upper part of the lower circular steel tube maintenance structure, the electric heating converter, the upper circular steel tube maintenance structure and the solar photovoltaic panel are located on the ground.

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) firstly prefabricating a combined pipeline monomer in a factory, manufacturing an inner layer GFRP circular pipe, an outer layer GFRP circular pipe, a shearing resistant connecting key, a GFRP high-strength bolt, a double positioning nut matched with the GFRP high-strength bolt, an annular heat transfer plate, a claw type connecting piece, a steel anchor frame and a temperature control device according to the size requirement, arranging the GFRP high-strength bolt on the inner layer GFRP circular pipe, reserving bolt holes on the annular heat transfer plate to enable the bolt holes to correspond to the GFRP high-strength bolt on the inner layer GFRP circular pipe, then adopting the double positioning nut to connect and fix the annular heat transfer plate and the inner layer GFRP circular pipe, arranging the shearing resistant connecting key on the inner side of the outer layer GFRP circular pipe, reserving bolt holes at two end parts of the inner layer GFRP circular pipe and the outer layer GFRP circular pipe, reserving bolt holes and heat conduction pipe mounting holes on the outer layer GFRP circular pipe at designed positions, connecting and fixing the claw type connecting piece and the steel anchor frame with the outer layer GFRP circular pipe through the high-strength, connecting a heat conduction pipe with an annular heat transfer plate between an inner layer of GFRP circular pipe and an outer layer of GFRP circular pipe through a heat conduction pipe mounting hole, welding a lower circular steel pipe maintenance structure on a steel anchor frame, leading out the heat conduction pipe through the lower circular steel pipe maintenance structure, screwing high-strength bolts at two ends, then simultaneously pouring a self-compacting fine stone concrete layer among the annular heat transfer plate, the inner layer of GFRP circular pipe and the outer layer of GFRP circular pipe from top to bottom, loosening and repeatedly twisting the high-strength bolts after the concrete is initially set to form bolt holes, and forming a combined pipeline monomer after maintenance;

2) prefabricating an inner layer GFRP circular tube, an outer layer GFRP circular tube and an annular heat transfer plate for forming an integral node in a factory, arranging a GFRP high-strength bolt on the inner layer GFRP circular tube of the integral node, reserving bolt holes on the annular heat transfer plate of the integral node, enabling the bolt holes to correspond to the GFRP high-strength bolt on the inner layer GFRP circular tube, then connecting and fixing the annular heat transfer plate and the inner layer GFRP circular tube through double positioning nuts, arranging a shear-resistant connecting key on the inner side of the outer layer GFRP circular tube of the integral node, reserving bolt holes at two end parts of the inner layer GFRP circular tube and the outer layer GFRP circular tube, reserving a concrete pouring hole and an exhaust hole at the top of the outer layer GFRP circular tube of the integral node, and reserving a concrete pouring hole and an;

3) transporting the prefabricated pipe monomer and the inner layer GFRP circular pipe, the outer layer GFRP circular pipe and the annular heat transfer plate of the integral node to the site, arranging two pipe monomers of a lower layer on site soil, then placing the inner layer GFRP circular pipe and the annular heat transfer plate which are connected and fixed with the integral node into the outer layer GFRP circular pipe, concentrically inserting the pipe monomers and the integral node which is not cast with concrete into the pipe monomers, fixedly connecting the pipe monomers and the integral node which is not cast with concrete by using a high-strength bolt, then using a concrete pump to fill the stirred self-compacting fine stone concrete between the annular heat transfer plate of the integral node and the inner layer GFRP circular pipe through a concrete filling hole on the annular heat transfer plate, stopping filling when the concrete at the exhaust hole on the annular heat transfer plate overflows, then filling the self-compacting fine stone concrete between the annular heat transfer plate of the integral node and the outer layer GFRP circular pipe through the concrete filling hole on the outer, stopping pouring when concrete at the exhaust hole on the outer layer GFRP circular pipe overflows, and sequentially connecting the pipeline monomers by adopting integral nodes;

4) connecting the claw type connecting piece between the two lower pipelines through the GFRP anti-buckling energy dissipation damper in a hinged mode, connecting one end of the GFRP anti-buckling energy dissipation damper for connecting the pipelines and the foundation with a circular ring of the claw type connecting piece, connecting the other end of the GFRP anti-buckling energy dissipation damper for connecting the pipelines and the foundation with the foundation in a hinged mode, connecting the two pipelines and the GFRP anti-buckling energy dissipation damper connected with the top pipeline after the bottom layer of the GFRP anti-buckling energy dissipation damper is completed, and burying soil to a designed height;

5) after the field is finished, arranging an upper layer of pipeline monomer on the field soil, then placing an inner layer GFRP circular pipe of the 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, the single pipeline body is fixedly connected with the integral node inner and outer GFRP circular pipes by high-strength bolts, then, a concrete pump is used for pouring the stirred self-compacting fine stone concrete into the GFRP circular tube interlayers at the inner layer and the outer layer of the integral node through the concrete pouring hole, stopping pouring when concrete at the exhaust hole overflows, sequentially connecting pipeline monomers through integral nodes, connecting the two pipelines at the lower part with the GFRP buckling-restrained energy-dissipation damper connected with the pipeline at the top part through claw-type connecting pieces in a hinged mode, adopting a construction method of constructing the two pipelines at the bottom layer and then constructing the pipeline at the upper layer, and arranging the GFRP buckling-restrained energy-dissipation dampers at intervals along the direction of the pipelines;

6) the lower round steel pipe maintenance structure and the heat conduction pipe which are installed are connected with the electric heating converter on site, the electric heating converter is connected with the solar photovoltaic power generation plate through the upper round steel pipe maintenance structure and the electric lead, and the intelligent temperature control device is arranged on the pipeline at intervals according to the above mode, so that the construction of the oil-gas multiphase flow multi-cavity intelligent heat preservation pipeline structure 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) three pipelines are adopted to simultaneously convey media, one medium can be conveyed, and two or three media can be conveyed simultaneously, so that the conveying mode is enriched, and the conveying efficiency is improved;

4) 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;

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

6) the pipeline is provided with the temperature control device, and the device can store and convert absorbed solar energy into heat energy in daytime and transmit the heat energy to the whole pipeline through the heat conduction pipe and the annular heat transfer plate, so that intelligent temperature control is realized;

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, and can obviously improve the fatigue resistance of the pipeline.

Description of the drawings:

FIG. 1 is a schematic view of a linear duct unit according to the present invention;

FIG. 2 is a schematic view of a single structure of the curved pipeline of the present invention;

FIG. 3 is a schematic structural diagram of a cross-over type pipeline monomer of 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 schematic cross-sectional view of an integral joint connection of the single pipe body of the present invention with no concrete poured;

FIG. 7 is a schematic cross-sectional view of the connection of the pipe elements of the present invention to the 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 structure of the mounting hole of the outer GFRP circular tube reserved heat conducting pipe of the single pipe of the present invention;

FIG. 16 is a schematic view of the claw coupling of the present invention;

FIG. 17 is a cross-sectional schematic view of the jaw connection of the present invention;

FIG. 18 is a schematic view of a GFRP anti-buckling energy-consuming damper of the present invention;

FIG. 19 is a schematic view of a temperature control device according to the present invention.

The specific implementation mode is as follows:

referring to the figures, the oil-gas multi-phase flow multi-cavity intelligent heat preservation pipeline structure and the construction method are formed by sequentially connecting three pipelines through GFRP anti-buckling energy dissipation dampers 25, 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 23 and an annular heat transfer plate 14, a plurality of shear connection 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 annular heat transfer plate 14 is arranged in the interlayer, the self-compacting fine stone concrete layer 23 is filled between the annular heat transfer 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 GFRP, the two end parts of the pipeline single body 1 are respectively provided with bolt holes 6, 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 23 and the annular heat transfer plate 14; the outer wall of the outer layer GFRP circular tube 12 is provided with an outer layer GFRP circular tube reserved bolt hole 28 and a heat conduction pipe mounting hole 22, a steel anchor frame 21 is mounted outside the heat conduction pipe mounting hole 22, a temperature control device is arranged on the steel anchor frame 21, and the temperature control device is connected with the annular heat transfer plate 14; 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 tube 12, an inner layer GFRP circular tube 13, a self-compaction fine stone concrete layer 23 and an annular heat transfer plate 14, wherein a plurality of shear connection keys 5 are evenly distributed on the inner wall of the outer layer GFRP circular tube 12 in the circumferential direction, the inner layer GFRP circular tube 13 surrounds the outer layer GFRP circular tube 12, an interlayer is arranged between the outer layer GFRP circular tube 12 and the inner layer GFRP circular tube 13, the annular heat transfer plate 14 is arranged in the interlayer, the self-compaction fine stone concrete layer 23 is filled between the annular heat transfer plate 14 and the tube wall, a plurality of GFRP high-strength bolts 7 are evenly distributed on the outer wall of the inner layer GFRP circular tube 13 in the circumferential direction, and the annular heat transfer plate 14 and the inner layer GFRP. 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 annular heat transfer plate 14 of the integral joint 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 temperature control device comprises a solar photovoltaic electric plate 15, an electric heating converter 16, a conducting wire 17 and a heat conduction pipe 18, wherein the solar photovoltaic electric plate 15 is connected with the electric heating converter 16 through the conducting wire 17, the electric heating converter 16 is connected with an annular heat transfer plate 14 through the heat conduction pipe 18, the conducting wire 17 and the heat conduction pipe 18 are respectively sleeved with an upper round steel pipe maintenance structure 19 and a lower round steel pipe maintenance structure 20, and the lower round steel pipe maintenance structure 20 is fixed on the outer wall of the pipeline monomer 1 through a steel anchor frame 21. The upper part of the lower round steel tube maintenance structure 20, the electrothermal converter 16, the upper round steel tube maintenance structure 19 and the solar photovoltaic panel 15 are positioned on the ground 27. 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 25, one end of each GFRP anti-buckling energy-dissipation damper 25 is connected with the outer wall of the pipeline single body 1 through a claw-type connecting piece 24, and the other end of each GFRP anti-buckling energy-dissipation damper 25 is hinged with a foundation 26. One end of the claw type connecting piece 24 is provided with a circular ring and is hinged with the GFRP buckling-restrained energy dissipation damper 25, the other end of the claw type connecting piece 24 is provided with a reserved bolt hole, and the reserved bolt hole is connected with an outer layer GFRP circular pipe reserved bolt hole 28 through a high-strength bolt 8. And a GFRP buckling-restrained energy-dissipation damper 25 is arranged between every two of the three pipelines, two ends of the GFRP buckling-restrained energy-dissipation damper 25 are respectively hinged with one end of a claw-type connecting piece 24, and the other end of the claw-type connecting piece 24 is respectively connected with an outer layer GFRP circular tube reserved bolt hole 28 of the corresponding pipeline single body 1 through a high-strength bolt 8.

The method comprises the following steps:

1) firstly prefabricating a combined pipeline monomer 1 in a factory, manufacturing an inner layer GFRP circular pipe 13, an outer layer GFRP circular pipe 12, a shear connection key 5, a GFRP high-strength bolt 7, a double positioning nut 9 matched with the GFRP high-strength bolt 7, an annular heat transfer plate 14, a claw type connecting piece 24, a steel anchor frame 21 and a temperature control device according to the size requirement, arranging the GFRP high-strength bolt 7 on the inner layer GFRP circular pipe 13, reserving bolt holes on the annular heat transfer plate 14 to enable the bolt holes to correspond to the GFRP high-strength bolt 7 on the inner layer GFRP circular pipe 13, then adopting the double positioning nut 9 to connect and fix the annular heat transfer plate 14 and the inner layer GFRP circular pipe 13, arranging the shear connection key 5 on the inner side of the outer layer GFRP circular pipe 12, reserving bolt holes 6 at two end parts of the inner and outer layer GFRP circular pipes, reserving bolt holes 28 and a heat conduction pipe mounting hole 22 on the outer layer GFRP circular pipe 12, connecting the claw type connecting piece 24 and the steel anchor frame 21 with the outer layer, an inner layer GFRP circular tube 13 with an annular heat transfer plate 14 is concentrically and vertically placed in an outer layer GFRP circular tube 12, a heat conduction tube 18 is connected with the annular heat transfer plate 14 between the inner layer GFRP circular tube and the outer layer GFRP circular tube through a heat conduction tube mounting hole 22, a lower circular tube maintenance structure 20 is welded on a steel anchor frame 21, the heat conduction tube 18 is led out through the lower circular tube maintenance structure 20, high-strength bolts 8 at two ends are screwed, then a self-compaction fine stone concrete layer 23 is simultaneously filled among the annular heat transfer plate 14, the inner layer GFRP circular tube 13 and the outer layer GFRP circular tube 12 from top to bottom, after initial setting of concrete, the high-strength bolts are loosened and repeatedly twisted to form bolt holes, and after maintenance, a combined pipeline monomer 1 is formed;

2) prefabricating an inner layer GFRP circular tube 13, an outer layer GFRP circular tube 12 and an annular heat transfer plate 14 for forming the integral node 4 in a factory, arranging a GFRP high-strength bolt 7 on the inner layer GFRP circular tube 13 of the integral node 4, reserving bolt holes on the annular heat transfer plate 14 of the integral node 4, enabling the bolt holes to correspond to the GFRP high-strength bolt 7 on the inner layer GFRP circular tube 13, then connecting and fixing the annular heat transfer plate 14 and the inner layer GFRP circular tube 13 through a double-positioning nut 9, arranging a shear-resistant connecting key 5 on the inner side of the outer layer GFRP circular tube 12 of the integral node 4, reserving bolt holes 6 at two end parts of the inner layer GFRP circular tube and the outer layer GFRP circular tube, reserving a concrete pouring hole 10 and an exhaust hole 11 at the top part of the outer layer GFRP circular tube 12 of the integral node 4, and reserving a concrete pouring hole 10 and;

3) transporting the prefabricated pipe single body 1 and the inner layer GFRP circular pipe 13, the outer layer GFRP circular pipe 12 and the annular heat transfer plate 14 of the integral node 4 to the site, arranging the two lower layer pipe single bodies 1 on the site soil, then placing the inner layer GFRP circular pipe 13 and the annular heat transfer plate 14 which are connected and fixed with the integral node 4 into the outer layer GFRP circular pipe 12, concentrically inserting the three into the pipe single body 1, fixedly connecting the pipe single body 1 and the integral node 4 which is not cast with concrete by using a high-strength bolt 8, then utilizing a concrete pump to firstly pour the stirred self-compacting fine stone concrete between the annular heat transfer plate 14 and the inner layer GFRP circular pipe 13 of the integral node 4 through the concrete pouring hole 10 on the annular heat transfer plate 14, stopping pouring when the concrete at the exhaust hole 11 on the annular heat transfer plate 14 overflows, and then pouring the self-compacting fine stone concrete into the annular heat transfer plate 14 and the outer layer GFRP circular heat transfer plate 14 and the annular heat transfer plate 14 of the integral node 4 through the concrete Between the GFRP circular pipes 12, when concrete at the exhaust holes 11 on the outer-layer GFRP circular pipe 12 overflows, the pouring is stopped, and the pipeline single bodies 1 are sequentially connected by adopting the integral nodes 4;

4) connecting the claw type connecting piece 24 between the two lower pipelines through the GFRP anti-buckling energy dissipation damper 25 in a hinged mode, connecting one end of the GFRP anti-buckling energy dissipation damper 25 for connecting the pipelines and the foundation 26 with a circular ring of the claw type connecting piece 24, connecting the other end of the GFRP anti-buckling energy dissipation damper 25 for connecting the pipelines and the foundation 26 with the foundation 26 in a hinged mode, connecting the two pipelines and the GFRP anti-buckling energy dissipation damper 25 connected with the top pipeline after the GFRP anti-buckling energy dissipation damper 25 at the bottom layer is completed, and burying soil to a designed height;

5) after the field is finished, arranging the upper layer of the pipeline monomer 1 on the field soil, then placing the inner layer GFRP circular tube 13 of the integral node 4 into the outer layer GFRP circular tube 12, concentrically inserting the two into the pipeline monomer 1, the single pipeline 1 is fixedly connected with the GFRP circular pipes on the inner layer and the outer layer of the integral node 4 by high-strength bolts 8, then, a concrete pump is used for pouring the stirred self-compacting fine stone concrete into the GFRP circular tube interlayers of the inner layer and the outer layer of the integral node 4 through the concrete pouring hole 10, stopping pouring when concrete at the exhaust holes 11 overflows, sequentially connecting the pipeline monomers 1 through the integral joints 4, connecting the two pipelines at the lower part with the GFRP anti-buckling energy-dissipation damper 25 connected with the pipeline at the top part through the claw-type connecting piece 24 in a hinged mode, adopting a construction method of constructing the two pipelines at the bottom layer and then constructing the pipeline at the upper layer, and arranging the GFRP anti-buckling energy-dissipation dampers 25 at intervals along the direction of the pipelines;

6) the lower round steel pipe maintenance structure 20 and the heat conduction pipe 18 which are installed are connected with the electric heating converter 16 on site, the electric heating converter 16 is connected with the solar photovoltaic power generation plate 15 through the upper round steel pipe maintenance structure 19 and the electric lead 17, and the intelligent temperature control devices are arranged on the pipeline at intervals according to the above mode, so that the construction of the oil-gas multiphase flow multi-cavity intelligent heat preservation pipeline structure is completed.

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

The inner layer GFRP circular tube and the annular heat transfer plate are concentrically and vertically placed in the outer layer GFRP circular tube, and self-compacting fine stone concrete is poured from top to bottom to form a single pipeline body, so that the single pipeline body is conveniently connected with the integral node.

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

Protect conductor wire and heat pipe through upper and lower circular steel tube maintenance structure, the device can be with the solar energy storage of absorbing daytime and change into heat energy, transmits for whole pipeline through the annular heat transfer plate to realize pipeline intelligence accuse temperature, annular heat transfer plate can not take place easily to destroy between inside and outside two-layer GFRP pipe simultaneously.

The GFRP anti-buckling energy dissipation dampers are horizontally and symmetrically arranged on the side faces of the pipeline monomers, one ends of the GFRP anti-buckling energy dissipation dampers are connected with the pipeline monomers 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.

The GFRP buckling restrained energy dissipation damper is arranged between the three pipelines to play a role in mutual fixation, and the three pipelines are adopted to convey media simultaneously, so that 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 intelligent heat preservation pipeline structure 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 straight pipeline monomers through integral joints, as shown in fig. 4 and 5, the straight pipeline monomers are formed by inner and outer layers of seamless winding type GFRP circular pipes, annular heat transfer plates and interlayer self-compacting fine stone concrete, as shown in fig. 8, 9, 10 and 11, GFRP shear connection 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 annular heat transfer plates are fixed with the inner layer GFRP circular pipe through double positioning nuts, the straight pipeline monomers are connected in situ by adopting the integral joints, as shown in fig. 6 and 7, the integral joints are formed by the inner and outer layers of GFRP circular pipes and the annular heat transfer plates by clamping concrete, the integral joints without pouring concrete are connected and fixed with the two sections of pipeline monomers, the annular heat transfer plates in the pipeline monomers and the annular heat transfer, and pouring self-compacting fine stone concrete into the fixed connecting joint. Referring to fig. 1, GFRP buckling-restrained energy-dissipation dampers are symmetrically arranged at intervals between the outer sides of three pipelines and between the pipelines, and intelligent temperature control devices (the temperature control devices are solar energy-electricity-heat conversion temperature control devices) are arranged at intervals on the pipelines, and each intelligent temperature control device is composed of a solar photovoltaic power generation board, an electric heat converter, a conductive wire, a heat conduction pipe and upper and lower round steel pipe maintenance structures, wherein the lower part of the heat conduction pipe is reliably connected with an annular heat transfer board, the upper part of the heat conduction pipe is connected with the electric heat converter, and the electric heat converter is connected with the solar. The conductor wire and the heat conduction pipe are protected by the upper round steel pipe maintenance structure and the lower round steel pipe maintenance structure. The device can be with the solar energy storage of daytime absorbing and change into heat energy, transmits whole pipeline for through annular heat transfer plate to realize pipeline intelligence accuse temperature. The displacement deformation of the pipeline is controlled within an allowable range, and the structural safety and smooth conveying of the pipeline are ensured. This kind of intelligent heat preservation pipeline structure of multiphase flow multicavity of oil gas sets up three pipelines and carries the medium simultaneously, can improve conveying efficiency, also can enrich the transport mode, the GFRP pipe material tensile strength that this kind of intelligent heat preservation pipeline structure of multiphase flow multicavity of oil gas adopted is high, the quality is light, good construction manufacturability has, corrosion resisting property is good, it is insensitive to temperature variation, the heat-proof quality is good, be convenient for in high and severe cold district and saline and alkaline region application, can carry the liquid and the gas that steel pipeline can not carry simultaneously, can ensure the stability of carrying the medium simultaneously.

As shown in fig. 4, bolt holes are reserved at two ends of the inner and outer layers of GFRP round pipes and the annular heat transfer plate, as shown in fig. 14 and 15, bolt holes are reserved at two ends of the inner and outer layers of GFRP round pipes and the annular heat transfer plate, bolt holes and heat pipe mounting holes are reserved on the side surface and the upper surface of the outer layer of GFRP round pipe, a shear-resistant connecting key is arranged at the inner side of the outer layer of GFRP round pipe, GFRP high-strength bolts are arranged in advance at the outer side of the inner layer of GFRP round pipe, bolt holes are reserved at corresponding positions on the annular heat transfer plate, so that the bolt holes correspond to the positions of the GFRP high-strength bolts on the inner layer of GFRP round pipe, then the annular heat transfer plate is connected and fixed with the inner layer of GFRP round. An inner layer GFRP circular pipe with an annular heat transfer plate is concentrically and vertically placed in an outer layer GFRP circular pipe, and bolt holes reserved in the inner layer GFRP circular pipe and the outer layer GFRP circular pipe are guaranteed to be in one-to-one correspondence. And the lower round steel tube maintenance structure is fixed on the outer layer GFRP circular tube through the steel anchor frame, one end of the heat conduction tube is connected with the annular heat transfer plate through the heat conduction tube mounting hole, and the other end of the heat conduction tube is led out through the lower round steel tube maintenance structure. Self-compacting fine stone concrete is poured from top to bottom to form a pipeline monomer, so that the pipeline monomer is conveniently connected with the integral node. The oil-gas multiphase flow multi-cavity intelligent heat-insulation pipeline has a smooth inner surface, small resistance to a conveying medium and relatively less deposited medium, 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, an annular heat transfer plate and self-compacting fine aggregate concrete, GFRP shear-resistant connecting keys are arranged on the inner side of the outer layer of the GFRP round pipe according to a certain rule, GFRP high-strength bolts are arranged on the outer side of the inner layer of the GFRP round pipe according to a certain rule, bolt holes are reserved on the annular heat transfer plate to enable the bolt holes to correspond to the positions of the GFRP high-strength bolts, the annular heat transfer plate and the inner layer of the GFRP round pipe are fixed through double positioning nuts, bolt holes are reserved at two end parts of the inner and outer layers of the GFRP round pipe, the multi-cavity multi-phase flow intelligent heat-insulation pipeline monomer is connected through the high-strength bolts. 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 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, 16, 17 and 18, GFRP buckling-restrained energy-dissipation dampers are arranged between three pipelines and outside the three pipelines in the oil-gas multiphase flow multi-cavity intelligent heat-insulating 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 three 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 intelligent heat-insulation pipeline structure, can play a role in energy dissipation and shock absorption during an earthquake, and effectively improves the anti-seismic performance of the pipeline.

As shown in fig. 19, the solar-electric heat converter is arranged on the oil-gas multiphase flow multi-cavity intelligent heat preservation pipeline, the device is composed of a solar photovoltaic power generation plate, an electric heat converter, a conducting wire, a heat conduction pipe and an upper round steel pipe and a lower round steel pipe maintenance structure, the lower portion of the heat conduction pipe is reliably connected with an annular heat transfer plate, the upper portion of the heat conduction pipe is connected with the electric heat converter, and the electric heat converter is connected with the solar photovoltaic power generation plate through the conducting. The conductor wire and the heat conduction pipe are protected by the upper round steel pipe maintenance structure and the lower round steel pipe maintenance structure. The device can be with the solar energy storage of daytime absorbing and change into heat energy, transmits whole pipeline for through annular heat transfer plate to realize pipeline intelligence accuse temperature.

The construction method comprises the following steps: the construction steps are as described above.

Example two

Referring to fig. 2, the oil-gas multiphase flow multi-cavity intelligent heat preservation pipeline structure is formed by connecting three pipelines through GFRP buckling-restrained energy dissipation dampers, and 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, an annular heat transfer plate and interlayer self-compacting fine stone concrete, 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 annular heat transfer 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 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 annular heat transfer plate and the self-compacting fine stone concrete, the GFRP high-strength bolts are arranged on the outer side of the node inner layer GFRP circular pipe according to a certain rule, bolt holes are reserved on, the annular heat transfer plate is fixed with the inner layer GFRP circular tube through the double positioning nuts, bolt holes are reserved at two end parts of the inner and outer layer GFRP circular tubes, the annular heat transfer plate is connected with the oil-gas multi-phase flow multi-cavity intelligent heat preservation pipeline monomer through the high-strength bolt, pouring self-compacting fine stone concrete into the fixed integral node of the un-poured concrete, and combining with the figure 2, GFRP buckling restrained energy dissipation dampers are symmetrically arranged between the outer sides of the two pipelines and the pipelines at certain intervals, solar energy-electric heat converters are arranged on the pipelines at certain intervals, the device is maintained the structure by photovoltaic power generation board, electric heat converter, conductor wire, heat pipe and upper and lower circular steel tube and constitutes, and the heat pipe lower part is reliably connected with annular heat transfer plate, and upper portion links to each other with the electric heat converter, and the electric heat converter passes through the conductor wire and links to each other with solar photovoltaic power generation board, maintains the structure protection with conductor wire and heat pipe through upper and lower circular steel tube. The device can be with the solar energy storage of daytime absorbing and change into heat energy, transmits whole pipeline for through annular heat transfer plate to realize pipeline intelligence accuse temperature. The intelligent multi-cavity heat-insulation pipeline for oil-gas multiphase flow has strong applicability, the pipeline can be linearly and curvilinearly arranged and combined, the problem of limitation of the traditional pipeline is solved, the intelligent multi-cavity heat-insulation pipeline can be buried underground and can also be arranged on the ground, the intelligent multi-cavity heat-insulation pipeline is flexibly arranged aiming at complex terrains, mountains, rivers and the like can be avoided, and the construction period is greatly shortened.

The construction method comprises the following steps: firstly, prefabricating a single curved pipeline in a factory, and manufacturing an inner layer GFRP circular pipe, an outer layer GFRP circular pipe, a GFRP shearing-resistant connecting key, a GFRP high-strength bolt, a matched nut, an annular heat transfer plate, a claw type connecting piece, a steel anchor frame and a temperature control device according to the size requirement. And arranging a GFRP high-strength bolt on the inner-layer GFRP circular pipe, reserving bolt holes on the annular heat transfer plate, enabling the bolt holes to correspond to the GFRP high-strength bolt on the inner-layer GFRP circular pipe, and then connecting and fixing the annular heat transfer plate by adopting double positioning nuts. The inner side of the outer layer GFRP circular pipe is provided with a GFRP shearing-resistant connecting key, bolt holes are reserved at two end parts of the inner layer GFRP circular pipe and the outer layer GFRP circular pipe, bolt holes and heat conduction pipe mounting holes are reserved at designed positions on the outer layer GFRP circular pipe, and the claw type connecting piece, the steel anchor frame and the outer layer GFRP circular pipe are fixedly connected through the high-strength bolt. The inner GFRP circular tube with the annular heat transfer plate is concentrically placed in the outer GFRP circular tube, the heat transfer pipe is connected with the annular heat transfer plate between the inner GFRP circular tube and the outer GFRP circular tube through the heat transfer pipe mounting hole, the lower circular steel tube maintenance structure is welded on the steel anchor frame, and the heat transfer pipe is led out through the lower circular steel tube maintenance structure. The method comprises the steps of arranging the assembled non-cast concrete curved pipeline in a vertical mode, reliably fixing, screwing high-strength bolts at two ends, pouring self-compacting fine stone concrete among the annular heat transfer plate, the inner layer GFRP circular pipe and the outer layer GFRP circular pipe from the higher end, loosening and repeatedly twisting the high-strength bolts after initial setting of the concrete to form bolt holes, and forming a curved pipeline monomer 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 intelligent heat preservation pipeline structure is formed by connecting three pipelines through GFRP buckling-restrained energy dissipation dampers, and 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 figure 13, the crossing pipeline monomer is formed by inner and outer seamless winding type GFRP circular pipes and self-compacting fine stone concrete clamped in an annular heat transfer plate, as shown in figures 9 and 11, GFRP shearing resistant connecting keys are arranged on the inner side of the outer GFRP circular pipe according to a certain rule, GFRP high-strength bolts are arranged on the outer side of the inner GFRP circular pipe according to a certain rule, the annular heat transfer plate is fixed with the inner 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 and outer GFRP circular pipes, the annular heat transfer plate and the self-compacting fine stone concrete, the GFRP high-strength bolts are arranged on the outer side of the inner GFRP circular pipe according to a certain rule, bolt holes are reserved on the annular heat transfer plate, so, the annular heat transfer plate is fixed with the inner-layer GFRP circular tube through the double-positioning nut, bolt holes are reserved in two end portions of the inner-layer GFRP circular tube and the outer-layer GFRP circular tube, the annular heat transfer plate and the oil-gas multi-phase flow multi-cavity intelligent heat-insulation pipeline are connected through the high-strength bolts, and self-compacting fine aggregate concrete is poured into the fixed integral node without pouring concrete. Referring to fig. 3, GFRP buckling-restrained energy-dissipation dampers are horizontally arranged at intervals between the outer sides of two pipes and the pipes, and solar-electric heat converters are arranged at intervals on the pipes, the device is composed of a photovoltaic power generation plate, an electric heat converter, a conducting wire, a heat conducting pipe and an upper round steel pipe maintenance structure and a lower round steel pipe maintenance structure, the lower portion of the heat conducting pipe is reliably connected with an annular heat transfer plate, the upper portion of the heat conducting pipe is connected with the electric heat converter, and the electric heat converter is connected with the solar photovoltaic power generation. The conductor wire and the heat conduction pipe are protected by the upper round steel pipe maintenance structure and the lower round steel pipe maintenance structure. The device can be with the solar energy storage of daytime absorbing and change into heat energy, transmits whole pipeline for through annular heat transfer plate to realize pipeline intelligence accuse temperature. The intelligent heat-insulating pipeline of oil gas multiphase flow multicavity has strong applicability, and the pipeline can be arranged linearly, curvilinearly and stridedly, solves the problem of single limitation of the traditional pipeline, can be buried underground, can also be arranged on the ground, is arranged flexibly aiming at complex terrains, can avoid mountains, rivers and the like, and greatly shortens the construction period.

The construction method comprises the following steps: prefabricating a crossing type pipeline monomer in a factory, and manufacturing an inner layer GFRP circular pipe, an outer layer GFRP circular pipe, a GFRP shearing-resistant connecting key, a GFRP high-strength bolt, a matched nut, an annular heat transfer plate, a claw type connecting piece, a steel anchor frame and a temperature control device according to the size requirement. And arranging a GFRP high-strength bolt on the inner-layer GFRP circular pipe, reserving bolt holes on the annular heat transfer plate, enabling the bolt holes to correspond to the GFRP high-strength bolt on the inner-layer GFRP circular pipe, and then connecting and fixing the annular heat transfer plate by adopting double positioning nuts. The inner side of the outer layer GFRP circular pipe is provided with a GFRP shearing-resistant connecting key, bolt holes are reserved at two end parts of the inner layer GFRP circular pipe and the outer layer GFRP circular pipe, bolt holes and heat conduction pipe mounting holes are reserved at designed positions on the outer layer GFRP circular pipe, and the claw type connecting piece, the steel anchor frame and the outer layer GFRP circular pipe are fixedly connected through the high-strength bolt. Then an inner GFRP circular tube with an annular heat transfer plate is concentrically placed in an outer GFRP circular tube, the heat transfer tube is connected with the annular heat transfer plate between the inner GFRP circular tube and the outer GFRP circular tube through a heat transfer tube mounting hole, a lower circular steel tube maintenance structure is welded on the steel anchor frame, and the heat transfer tube is led out through the lower circular steel tube maintenance structure. The crossing type pipeline which is assembled with the un-cast concrete is arranged in a concave shape and is reliably fixed, the arrangement is opposite to that in practical engineering application, high-strength bolts at two ends are screwed, self-compaction fine stone concrete is filled among the annular heat transfer plate, the inner layer GFRP circular pipe and the outer layer GFRP circular pipe from the other end, 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 intelligent heat-insulation pipeline structure 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 pipeline, 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; three pipelines are adopted to simultaneously convey media, one medium can be conveyed, and two or three media can be conveyed simultaneously, so that the conveying mode is enriched, and the conveying efficiency is improved; 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; the adopted GFRP circular tube non-metal material has high tensile strength, light weight, good construction manufacturability, good corrosion resistance, insensitivity to temperature change and good heat insulation, is convenient to be applied in high-stringency cold regions and saline-alkali regions, can convey liquid and gas which cannot be conveyed by steel pipelines, and simultaneously ensures the stability of conveyed media; the pipeline is provided with the temperature control device, and the device can store and convert absorbed solar energy into heat energy in daytime and transmit the heat energy to the whole pipeline through the heat conduction pipe and the annular heat transfer plate, so that intelligent temperature control is realized; 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, and can obviously improve the fatigue resistance of the pipeline.

Claims

1. The utility model provides an intelligent heat preservation pipeline structure of multiphase flow multicavity of oil gas which characterized in that: the anti-buckling energy dissipation device is formed by sequentially connecting three pipelines through GFRP anti-buckling energy dissipation dampers (25), 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 layer GFRP circular pipe (12), an inner layer GFRP circular pipe (13), a self-compacting fine stone concrete layer (23) and an annular heat transfer plate (14), a plurality of anti-shearing connecting keys (5) are uniformly distributed on the inner wall of the outer layer GFRP circular pipe (12) in the circumferential direction, the inner layer GFRP circular pipe (13) is surrounded in the outer layer GFRP circular pipe (12), an interlayer is arranged between the outer layer GFRP circular pipe (12) and the inner layer GFRP circular pipe (13), the annular heat transfer plate (14) is arranged in the interlayer, the self-compacting fine stone concrete layer (23) is filled between the annular heat transfer plate (14) and the pipe wall, and a plurality of GFRP, the GFRP high-strength bolt (7) fixes the annular heat transfer plate (14) and the inner-layer GFRP circular tube (13) through the double-positioning nut (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 (23) and the annular heat transfer 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 (28) and a heat conduction pipe mounting hole (22), a steel anchor frame (21) is mounted outside the heat conduction pipe mounting hole (22), a temperature control device is arranged on the steel anchor frame (21), and the temperature control device is connected with the annular heat transfer plate (14); 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 intelligent heat-insulating pipeline structure according to claim 1, characterized in that: integral node (4) include outer GFRP pipe (12), inlayer GFRP pipe (13), self-compaction pea gravel concrete layer (23) and annular heat transfer plate (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 annular heat transfer plate (14) in the intermediate layer, be full of self-compaction pea gravel concrete layer (23) between annular heat transfer plate (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 with inlayer GFRP pipe (13) with annular heat transfer plate (14) through two set nut (9).

3. The oil-gas multiphase flow multi-cavity intelligent heat-insulating pipeline structure according to claim 2, characterized in that: 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 intelligent heat-insulating pipeline structure according to claim 2, characterized in that: 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; the annular heat transfer plate (14) of the integral joint (4) is also provided with a concrete pouring hole (10) and an exhaust hole (11), and the concrete pouring hole (10) and the exhaust hole (11) are in one-to-one correspondence in the upper and lower positions.

5. The oil-gas multiphase flow multi-cavity intelligent heat-insulating pipeline structure according to claim 1, characterized in that: the temperature control device comprises a solar photovoltaic panel (15), an electric heating converter (16), a conducting wire (17) and a heat conducting pipe (18), the solar photovoltaic panel (15) is connected with the electric heating converter (16) through the conducting wire (17), the electric heating converter (16) is connected with an annular heat transfer plate (14) through the heat conducting pipe (18), an upper round steel pipe maintenance structure (19) and a lower round steel pipe maintenance structure (20) are respectively sleeved outside the conducting wire (17) and the heat conducting pipe (18), and the lower round steel pipe maintenance structure (20) is fixed on the outer wall of the pipeline single body (1) through a steel anchor frame (21); the upper part of the lower round steel tube maintenance structure (20), the electric heating converter (16), the upper round steel tube maintenance structure (19) and the solar photovoltaic panel (15) are located on the ground (27).

6. The oil-gas multiphase flow multi-cavity intelligent heat-insulating pipeline structure according to claim 1, characterized in that: 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.

7. The oil-gas multiphase flow multi-cavity intelligent heat-insulating pipeline structure according to claim 1, characterized in that: 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 intelligent heat-insulating pipeline structure according to claim 1, characterized in that: GFRP anti-buckling energy-dissipation dampers (25) are horizontally and symmetrically arranged on the side face of the pipeline single body (1), one end of each GFRP anti-buckling energy-dissipation damper (25) is connected with the outer wall of the pipeline single body (1) through a claw-type connecting piece (24), and the other end of each GFRP anti-buckling energy-dissipation damper (24) is hinged to a foundation (26); one end of the claw type connecting piece (24) is provided with a circular ring and is hinged with the GFRP buckling-restrained energy dissipation damper (25), the other end of the claw type connecting piece (24) is provided with a reserved bolt hole, and the reserved bolt hole is connected with an outer layer GFRP circular tube reserved bolt hole (28) through a high-strength bolt (8).

9. The oil-gas multiphase flow multi-cavity intelligent heat-insulating pipeline structure according to claim 1, characterized in that: and a GFRP buckling-restrained energy-dissipation damper (25) is arranged between every two of the three pipelines, two ends of the GFRP buckling-restrained energy-dissipation damper (25) are respectively hinged with one end of a claw-type connecting piece (24), and the other end of the claw-type connecting piece (24) is respectively connected with an outer layer GFRP circular tube reserved bolt hole (28) 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 intelligent heat-insulation pipeline structure according to claim 1, characterized by comprising the following steps of: the method comprises the following steps:

firstly prefabricating a combined pipeline monomer (1) in a factory, manufacturing an inner layer GFRP circular pipe (13), an outer layer GFRP circular pipe (12), a shear-resistant connecting key (5), a GFRP high-strength bolt (7), a double positioning nut (9) matched with the GFRP high-strength bolt (7), an annular heat transfer plate (14), a claw type connecting piece (24), a steel anchor frame (21) and a temperature control device according to the size requirement, arranging the GFRP high-strength bolt (7) on the inner layer GFRP circular pipe (13), reserving bolt holes on the annular heat transfer plate (14), enabling the bolt holes to correspond to the GFRP high-strength bolt (7) on the inner layer GFRP circular pipe (13), then adopting the double positioning nut (9) to fixedly connect the annular heat transfer plate (14) with the inner layer GFRP circular pipe (13), arranging the shear-resistant connecting key (5) on the inner side of the outer layer GFRP circular pipe (12), reserving bolt holes (6) at two end parts of the inner and outer layer GFRP circular pipes, reserving bolt holes (28) at the designed positions on the outer Pipe mounting holes (22), connecting and fixing a claw type connecting piece (24) and a steel anchor frame (21) with an outer GFRP circular pipe (12) through a high-strength bolt (8), concentrically and vertically placing an inner GFRP circular pipe (13) with an annular heat transfer plate (14) in the outer GFRP circular pipe (12), connecting a heat conduction pipe (18) with the annular heat transfer plate (14) between the inner GFRP circular pipe and the outer GFRP circular pipe through the heat conduction pipe mounting holes (22), welding a lower round steel pipe maintenance structure (20) on the steel anchor frame (21), leading out the heat conduction pipe (18) through a lower round steel pipe maintenance structure (20), screwing the high-strength bolts (8) at two ends, then simultaneously filling a self-compacting fine stone concrete layer (23) among the annular heat transfer plate (14), the inner GFRP circular pipe (13) and the outer GFRP circular pipe (12) from top to bottom, loosening and repeatedly twisting the high-strength bolts after initial concrete setting to form bolt holes, forming a combined pipeline monomer (1) after maintenance;

an inner layer GFRP circular tube (13), an outer layer GFRP circular tube (12) and an annular heat transfer plate (14) for forming an integral node (4) are prefabricated in a factory, GFRP high-strength bolts (7) are arranged on the inner layer GFRP circular tube (13) of the integral node (4), bolt holes are reserved in the annular heat transfer plate (14) of the integral node (4) and correspond to the GFRP high-strength bolts (7) on the inner layer GFRP circular tube (13), then the annular heat transfer plate (14) and the inner layer GFRP circular tube (13) are fixedly connected through double positioning nuts (9), a shear-resistant connecting key (5) is arranged on the inner side of the outer layer GFRP circular tube (12) of the integral node (4), bolt holes (6) are reserved at two end portions of the inner layer GFRP circular tube and the outer layer GFRP circular tube, concrete pouring holes (10) and exhaust holes (11) are reserved at the top portion of the outer layer GFRP circular tube (12) of the integral node (4), and concrete pouring holes are reserved at corresponding positions on the annular heat (10) And an exhaust hole (11);

transporting the prefabricated pipeline single body (1) and the inner GFRP circular tube (13), the outer GFRP circular tube (12) and the annular heat transfer plate (14) of the integral node (4) to the site, arranging the two lower-layer pipeline single bodies (1) on the site soil, then placing the inner GFRP circular tube (13) and the annular heat transfer plate (14) which are connected and fixed with the integral node (4) into the outer GFRP circular tube (12), concentrically inserting the three into the pipeline single body (1), fixedly connecting the pipeline single body (1) and the integral node (4) which is not poured with concrete by using a high-strength bolt (8), then pouring the stirred self-compacting fine stone concrete between the annular heat transfer plate (14) and the inner GFRP circular tube (13) of the integral node (4) through a concrete pouring hole (10) on the annular heat transfer plate (14) by using a concrete pump, and stopping pouring when the concrete overflows from the exhaust hole (11) on the annular heat transfer plate (14), then self-compacting fine stone concrete is poured between the annular heat transfer plate (14) of the integral node (4) and the outer layer GFRP circular tube (12) through the concrete pouring hole (10) on the outer layer GFRP circular tube (12), when the concrete overflows from the exhaust hole (11) on the outer layer GFRP circular tube (12), the pouring is stopped, and the pipeline single bodies (1) are sequentially connected by adopting the integral node (4);

connecting a claw type connecting piece (24) between two lower pipelines through a GFRP (glass fiber reinforced plastic) buckling-restrained energy-dissipation damper (25), wherein the connecting modes are hinged, one end of the GFRP buckling-restrained energy-dissipation damper (25) for connecting the pipelines and a foundation (26) is connected with a circular ring of the claw type connecting piece (24), the other end of the GFRP buckling-restrained energy-dissipation damper is connected with the foundation (26), the connecting modes of the two ends are hinged, after the GFRP buckling-restrained energy-dissipation damper (25) at the bottom layer is completed, the two pipelines and the GFRP buckling-restrained energy-dissipation damper (25) 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 into the pipeline monomer (1), fixedly connecting the pipeline monomer (1) with the inner layer GFRP circular pipe and the outer layer GFRP circular pipe 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 of the inner layer GFRP circular pipe and the outer layer GFRP circular pipe of the integral node (4) 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 lower pipelines with a GFRP buckling-preventing energy-consuming damper (25) connected with a top pipeline through a claw type connecting piece (24), wherein the connecting modes are hinged, and adopting a construction method of constructing the upper layer of pipelines, arranging GFRP buckling restrained energy-dissipation dampers (25) at intervals along the direction of the pipeline;

the lower round steel pipe maintenance structure (20) and the heat conduction pipe (18) which are installed are connected with the electric heating converter (16) on site, the electric heating converter (16) is connected with the solar photovoltaic power generation board (15) through the upper round steel pipe maintenance structure (19) and the electric lead (17), and the intelligent temperature control device is arranged on the pipeline at intervals according to the above mode, so that the construction of the oil-gas multiphase flow multi-cavity intelligent heat preservation pipeline structure is completed.