CN219221514U

CN219221514U - FRP-concrete-steel double-wall hollow composite pipeline

Info

Publication number: CN219221514U
Application number: CN202320085080.XU
Authority: CN
Inventors: 张树琛; 杨勇; 陈世敬; 杨仕聪; 黄锦豪; 许嘉豪
Original assignee: Xian University of Architecture and Technology
Current assignee: Xian University of Architecture and Technology
Priority date: 2023-01-29
Filing date: 2023-01-29
Publication date: 2023-06-20
Anticipated expiration: 2033-01-29

Abstract

The utility model discloses an FRP-concrete-steel double-wall hollow composite pipeline, which is prefabricated in sections along the length direction, and adjacent pipeline section units form a pipeline through connecting nodes. The pipe section unit comprises an inner first steel pipe, an outer FRP pipe and sandwich concrete filled between the first steel pipe and the FRP pipe. The connecting node comprises a flange plate and a high-strength bolt. The outer wall of the first steel pipe is provided with a pin connecting piece. The utility model fully exerts the advantages of the combined structure, the first steel tube and the FRP tube bear the tensile force, the interlayer concrete bears the pressure, and the utility model has the advantages of high bearing capacity, good ductility, good durability and the like, the stud strengthens the cooperative working capacity of the first steel tube and the concrete, the FRP outer tube restrains the concrete, and the corrosion resistance of the pipeline is improved. The adjacent pipe section units are connected by bolts, so that the construction is convenient and the connection is reliable.

Description

FRP-concrete-steel double-wall hollow composite pipeline

Technical Field

The utility model belongs to the technical field of gas pipelines, and particularly relates to an FRP-concrete-steel double-wall hollow composite pipeline.

Background

In the long-distance transportation process of the fuel gas, the fuel gas needs to pass through a region with severe natural environment and complex geological conditions, and all the adverse factors put higher requirements on the fuel gas pipeline,

at present, the gas pipeline mainly comprises a steel pipe, the steel pipe has high strength and good seepage resistance, but the problems of low rigidity, large deformation, poor corrosion resistance and the like exist, and most of the gas pipeline adopts an underground laying method, so that the steel pipe is more easy to generate serious corrosion.

For example, patent CN214948277U discloses a gas pipeline, which is wrapped with an annular protective layer outside the pipeline, but which is still a monolithic structure, the pipeline is not segmented, and the annular protective layer is made of a self-adhesive tape wound in multiple layers, and obviously does not have the protection capability for the steel pipe. As it is described, "at present, the gas pipeline is generally made of polyethylene material", which refers to the indoor portion of the gas pipeline, not the long-distance transportation pipeline buried underground. CN206973270U discloses a gas leakage preventing pipeline, which segments the pipeline, but on one hand, the whole protection of the steel pipe is not involved, and on the other hand, the connection structure between the pipe sections is complex, and is not suitable for large-scale underground deep burying application.

Disclosure of Invention

In order to overcome the defects in the prior art, the utility model aims to provide the FRP-concrete-steel double-wall hollow composite pipeline, so that the bearing capacity, the ductility and the stability of the whole pipeline are improved while the first steel pipe is integrally protected, the construction is convenient, and the connection is reliable.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

the FRP-concrete-steel double-wall hollow composite pipeline is characterized in that the pipeline is prefabricated in a segmented mode along the length direction, and adjacent pipeline section units are connected through connecting nodes;

the pipe section unit includes: the concrete filling system comprises an inner first steel pipe, an outer FRP pipe and interlayer concrete filled between the first steel pipe and the FRP pipe;

the connecting node comprises a flange plate; the flange plate is formed by welding an annular steel plate and a second steel pipe; in each pipe section unit, two ends of the first steel pipe are respectively welded with a second steel pipe, one end of each second steel pipe far away from the first steel pipe is welded with the end face of the annular steel plate, and two annular steel plates are connected between adjacent pipe section units through welding or bolts so as to realize connection;

the outer wall of the first steel pipe is provided with a bolt connecting piece along the radial direction, the bolt connecting piece is arranged in a square shape or a plum blossom shape, and the length of the bolt connecting piece is smaller than half of the thickness of the sandwich concrete.

In one embodiment, the sandwich concrete casting mode is prefabricated or cast-in-place.

In one embodiment, the sandwich concrete is a high strength concrete, preferably an ultra high performance concrete.

In one embodiment, the inner diameter of the annular steel plate and the inner diameter of the second steel tube are equal to the inner diameter of the first steel tube.

In one embodiment, when two annular steel plates are connected through bolts, the connecting node further comprises a high-strength bolt, the end faces of the annular steel plates are provided with reserved holes, and the connection is achieved by penetrating the high-strength bolt into the reserved holes in the two annular steel plates.

In one embodiment, the high-strength bolts are arranged at equal intervals along the circumferential direction of the pipe section; a plurality of stiffening rib plates are welded between the outer wall of the second steel pipe and one surface, close to the first steel pipe, of the inner portion of the end face of the annular steel plate, and the stiffening rib plates and the reserved holes are alternately arranged.

In one embodiment, the flange plate is outboard of the post-cast filler material.

In one embodiment, the filler material is ultra-high performance concrete.

Compared with the prior art, the utility model has the beneficial effects that:

1. performance enhancement

The FRP-concrete-steel double-wall hollow composite pipeline structure fully plays the advantages of a combined structure, has the advantages of high bearing capacity, good ductility, good durability and the like, the first steel pipe and the concrete are mutually restrained, the first steel pipe prevents the concrete from cracking, the concrete improves the stability of the first steel pipe, the stud strengthens the cooperative working capacity of the first steel pipe and the concrete, the FRP outer pipe restrains the concrete, and the corrosion resistance of the pipeline is improved.

2. Convenient construction

The FRP-concrete-steel double-wall hollow composite pipeline is prefabricated in sections along the length direction, the structural form of the pipeline section is simple, the pipeline section units are connected by high-strength bolts, the installation is convenient, and the connection is reliable. All components are prefabricated in a factory, the first steel pipe and the FRP pipe serve as templates for pouring sandwich concrete, construction procedures are simplified, and construction period is shortened. The workability will be greatly improved.

3. Reducing the cost

The FRP-concrete-steel double-wall hollow composite pipeline fully plays the material property of FRP, steel and concrete, has high bearing capacity and high rigidity, effectively reduces the steel consumption compared with the traditional steel structure pipeline, replaces a casting concrete template with the FRP pipe and the first steel pipe, utilizes good durability of the FRP outer pipe, reduces maintenance cost, reduces engineering cost and has good economic benefit.

In general, the FRP-concrete-steel double-wall hollow composite pipeline fully plays the material properties of FRP, steel and concrete, has the advantages of high bearing capacity, good ductility, good durability and the like, and the stud enhances the cooperative working capacity of the first steel pipe and the concrete. The pipe section units are connected by high-strength bolts, so that the installation is convenient and the connection is reliable. Meanwhile, the steel consumption and the maintenance cost are effectively reduced, the engineering cost is reduced, and the method has good economic benefit.

Drawings

FIG. 1 is a schematic view of a splice of FRP-concrete-steel double-walled hollow composite pipe segment units of the present utility model.

FIG. 2 is an overall schematic view of the FRP-concrete-Steel double-walled hollow composite pipe section unit of the present utility model.

Fig. 3 is an overall schematic diagram of a connection node of the present utility model.

FIG. 4 is a schematic cross-sectional view of the FRP-concrete-Steel double-walled hollow composite pipe section unit of the present utility model.

Fig. 5 is an overall schematic view of the FRP-concrete-steel double-wall hollow composite pipe of the present utility model.

Icon: 1-a pipe section unit; 2-connecting nodes; 3-a first steel pipe; 4-FRP pipe; 5-interlayer concrete; a flange plate 6; 7-high-strength bolts; 8-a peg connection; 9-a circumferential steel plate; 10-a second steel pipe; 11-preformed holes; 12-stiffening rib plates; 13-filling material.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present application, it should be noted that, the azimuth or positional relationship indicated by the terms "upper", "lower", etc. are based on the azimuth or positional relationship shown in the drawings, or the azimuth or positional relationship in which the product is conventionally put in use, are merely for convenience of describing the present application and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and therefore should not be construed as limiting the present application.

Referring to fig. 1, the utility model provides an FRP-concrete-steel double-wall hollow composite pipe, the whole pipe adopts the idea of sectionally prefabricating along the length direction, and adjacent pipe section units 1 are connected through connecting nodes 2.

Referring to fig. 2, the pipe section unit 1 mainly includes a first steel pipe 3 and an FRP pipe 4 coaxially provided inside and outside, and a sandwich concrete 5 is filled between the first steel pipe 3 and the FRP pipe 4.

In the utility model, through the structure of the first steel pipe-interlayer concrete-FRP pipe, the first steel pipe and the concrete are mutually restrained, the first steel pipe can prevent the concrete from cracking, the concrete can improve the stability of the first steel pipe, and the FRP pipe restrains the concrete from the outside, thereby improving the corrosion resistance of the pipeline. The first steel pipe and the FRP pipe are subjected to tensile force and the sandwich concrete is subjected to compressive force as a whole. And finally, the overall bearing capacity, ductility, durability and other performances of the pipeline can be greatly improved.

In addition, the FRP pipe and the first steel pipe in the structure can directly replace a pouring concrete template, and the good durability of the FRP outer pipe is utilized, so that the maintenance cost is reduced, and meanwhile, the steel consumption is reduced.

Referring to fig. 3, the connecting node 2 mainly comprises a flange plate 6; the flange plate 6 is formed by welding an annular steel plate 9 and a shorter second steel pipe 10; in each pipe section unit 1, two ends of the first steel pipe 3 inside are respectively welded with a second steel pipe 10, one end, far away from the first steel pipe 3, of each second steel pipe 10 is welded with the end face of the annular steel plate 9, and two annular steel plates 9 are connected between adjacent pipe section units 1 through welding or bolts, so that connection is achieved.

In the utility model, the connecting node 2 and the pipe section unit 1 are in a welding relationship, so that the stability is very good. Adjacent pipe section units 1 are connected through welding or bolting of the annular steel plates 9, so that the construction is simple and convenient, and the connection stability and the compactness can be ensured.

According to the utility model, the idea of sectionally prefabricating along the length direction is adopted, the structural form of the pipe section is simple, the pipe section units are connected by welding or high-strength bolts, the installation is convenient, and the connection is reliable. All the components can be prefabricated in a factory, the first steel pipe and the FRP pipe serve as templates for pouring sandwich concrete, construction procedures are simplified, and construction period is shortened. The workability will be greatly improved.

In some embodiments of the utility model, the length of each pipe segment unit 1 is typically 2-4m.

In some embodiments of the utility model, referring to fig. 4, the outer wall of the first steel pipe 3 is provided with a peg-shaped connector 8, the length direction of the peg-shaped connector 8 is preferably radial to the pipeline, square arrangement or quincuncial arrangement can be adopted, and the length of the peg-shaped connector 8 is generally less than half the thickness of the interlayer concrete 5.

In this embodiment, the co-operative ability of the first steel pipe 3 and the sandwich concrete 5 can be further enhanced by the peg connection 8.

In some embodiments of the present utility model, the interlayer concrete 5 may be high-strength concrete, preferably ultra-high performance concrete UHPC, and particularly recycled concrete, self-compacting concrete, fiber reinforced concrete, and reactive powder concrete may be used, which are selected according to the actual engineering requirements. The pouring mode can be prefabricated or cast-in-situ, and the pouring mode is selected according to the dead weight of the actual engineering pipeline unit, so that the transportation efficiency is improved.

In some embodiments of the present utility model, the inner diameter of the annular steel plate 9 and the inner diameter of the second steel pipe 10 are equal to the inner diameter of the first steel pipe 3, so that good fluidity of pipeline transportation is ensured, and equal strength design of the pipeline is realized by controlling the wall thickness of the annular steel plate 9 and the wall thickness of the second steel pipe 10.

In some embodiments of the present utility model, when two ring-shaped steel plates 9 are connected by bolts, the connection node 2 should obviously also comprise high-strength bolts 7, and in this case, a preformed hole 11 may be provided on the end surface of the ring-shaped steel plates 9, and in the field or in a factory, the connection of the adjacent pipe section units 1 may be achieved by penetrating the high-strength bolts 7 into the preformed holes 11 on the two ring-shaped steel plates 9. The flange has high connection strength, good fatigue performance, better stability and safety,

obviously, the high-strength bolts 7 should be arranged at equal intervals along the circumferential direction of the pipe section, and a plurality of stiffening rib plates 12 can be welded between the outer wall of the second steel pipe 10 and one surface of the first steel pipe 3, which is close to the inner end surface of the annular steel plate 9, at this time, the stiffening rib plates 12 and the reserved holes 11 are arranged at intervals, i.e. one reserved hole 11 is arranged between the adjacent stiffening rib plates 12. The rigidity of the pipeline connection joint can be obviously improved by adopting the rigid flange connection and the welded stiffening rib, so that the prying force effect is obviously reduced when the joint is pulled.

In some embodiments of the present utility model, referring to fig. 5, the filling material 13 is post-poured outside the flange plate 6, and the filling material 13 may be ultra-high performance concrete UHPC, specifically, fiber reinforced cement based composite ECC or non-shrinkage self-compaction high strength grouting CGM may be used. The UHPC has high strength and good fatigue resistance, the ECC has high toughness and good crack resistance, the CGM has high self-fluidity and good durability, and the like, so as to meet different requirements of actual engineering on concrete performance.

In some embodiments of the present utility model, when two ring-shaped steel plates 9 are connected by welding, the outer end surfaces of the ring-shaped steel plates 9 are directly welded without providing the preformed holes 11.

The foregoing is merely a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and variations may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. The FRP-concrete-steel double-wall hollow composite pipeline is characterized in that the pipeline is prefabricated in a segmented mode along the length direction, and adjacent pipeline section units (1) are connected through connecting nodes (2);

the pipe section unit (1) comprises: an inner first steel pipe (3), an outer FRP pipe (4), and a sandwich concrete (5) filled between the first steel pipe (3) and the FRP pipe (4);

the connecting node (2) comprises a flange plate (6); the flange plate (6) is formed by welding an annular steel plate (9) and a second steel pipe (10); in each pipe section unit (1), two ends of the first steel pipe (3) are respectively welded with a second steel pipe (10), one end, far away from the first steel pipe (3), of each second steel pipe (10) is welded with the end face of the annular steel plate (9), and two annular steel plates (9) are connected between adjacent pipe section units (1) through welding or bolting, so that connection is achieved;

the outer wall of the first steel pipe (3) is provided with a bolt connecting piece (8) along the radial direction, the bolt connecting piece (8) is arranged in a square shape or a quincuncial shape, and the length of the bolt connecting piece (8) is smaller than half of the thickness of the sandwich concrete (5).

2. The FRP-concrete-steel double-wall hollow composite pipe according to claim 1, characterized in that the sandwich concrete (5) is poured in a prefabricated or cast-in-place manner.

3. The FRP-concrete-steel double-wall hollow composite pipe according to claim 1 or 2, characterized in that the interlayer concrete (5) is a high-strength concrete.

4. The FRP-concrete-steel double-walled hollow composite pipe according to claim 1 characterized in that the inner diameter of the annular steel plate (9) and the inner diameter of the second steel pipe (10) are equal to the inner diameter of the first steel pipe (3).

5. The FRP-concrete-steel double-wall hollow composite pipeline according to claim 1, wherein when two annular steel plates (9) are connected through bolts, the connecting node (2) further comprises a high-strength bolt (7), the end face of the annular steel plate (9) is provided with a reserved hole (11), and the connection is realized through the reserved hole (11) penetrating into the two annular steel plates (9) through the high-strength bolt (7).

6. The FRP-concrete-steel double-wall hollow composite pipe according to claim 5, characterized in that the high-strength bolts (7) are arranged at equal intervals in the circumferential direction of the pipe section; a plurality of stiffening rib plates (12) are welded between the outer wall of the second steel pipe (10) and one surface, close to the inner first steel pipe (3), of the end surface of the annular steel plate (9), and the stiffening rib plates (12) and the reserved holes (11) are alternately arranged.

7. The FRP-concrete-steel double-walled hollow composite pipe according to claim 1 characterized in that the flange plate (6) is externally post-cast with a filler material (13).

8. The FRP-concrete-steel double-walled hollow composite pipe of claim 7 characterized in that the filler material is ultra-high performance concrete.