Carbon fiber plate winding reinforced pipeline

Abstract

The utility model provides a carbon fiber plate winding reinforced pipeline which is used for solving the technical problems that in order to increase the internal pressure resistance of an existing pipeline, the wall thickness of the pipeline needs to be continuously increased, and the cost, the weight and the size of the pipeline are greatly increased. The pipeline comprises a lining pipe, a carbon fiber plate and an outer frame, the carbon fiber plate is spirally wound on the outer wall of the lining pipe, and a protective layer is arranged on the outer side wall of the carbon fiber plate. The carbon fiber plate is spirally wound on the outer wall of the single-layer lining pipe, so that the internal pressure resistance of the pipeline is greatly improved, the carbon fiber plate is small in thickness and light in weight, the weight and the size of the pipeline can be greatly reduced, and the installation and transportation cost of the pipeline can also be reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to pipeline technical field, especially a kind of carbon fiber plate winding reinforced pipeline. BACKGROUND

[0002] In large-diameter, medium-high pressure water supply and drainage pipeline, the existing pipeline adopts metal (steel pipe, ductile cast iron pipe), prestressed concrete cylinder pipe (PCCP for short), composite plastic (PE, PVC, HDPE, etc.) and reinforced concrete pipe, and the internal pressure load that it can bear is closely related to the tensile strength and wall thickness of pipeline material. When the material is selected (i.e. the tensile strength of the material is determined), in order to increase the internal pressure resistance of the pipeline, the wall thickness of the pipeline needs to be increased continuously. The larger the diameter of the pipeline, the greater the wall thickness. For example, the wall thickness of D4000 diameter steel pipe will reach more than 30mm when the working pressure is 2.0MPa, and the weight of each meter of steel pipe is more than 3 tons. Obviously, this greatly increases the cost of the pipeline, and is not conducive to pipeline transportation and installation. For example, if prestressed concrete cylinder pipe (PCCP) is used, the wall thickness will exceed 300mm, and the prestressed steel wire needs to be double-wound, with a weight of more than 10 tons per meter. The cost is not cheap, and transportation and installation are also difficult. As shown in Table 1, theoretical calculation shows that only by increasing the tensile strength of the pipe wall material can the pipe wall thickness be reduced, and the weight and cost of the pipeline can be greatly reduced. The formula for calculating the internal pressure bearing capacity of the pipeline is:

[0003] Table 1 Wall thickness of different types of pipelines under the same internal pressure

[0004]

[0005] The tensile strength of carbon fiber material is extremely high, which is 5-10 times that of steel. It is an excellent material for making pipelines. However, in the prior art, carbon fiber cloth is pasted on the inner wall or outer wall of PCCP pipeline to reinforce the pipeline. This method is currently mainly used for pasting and reinforcing after the pipeline has some problems. The on-site construction of this method depends on the technical level of on-site workers, and the reinforcement quality is not easy to quantify. In addition, there are some carbon fiber pipes, which mainly use carbon fiber wire winding or prepreg winding, but they are small-diameter pipelines, mainly used for fishing rods, bicycle frames, etc., and are not suitable for large-diameter water pipelines.

[0006] Therefore, it is necessary to solve the technical problem of increasing the wall thickness to increase the internal pressure resistance of the pipeline, which greatly increases the weight and cost of the pipeline. CONTENT OF THE UTILITY MODEL

[0007] The utility model discloses a carbon fiber plate winding reinforced pipeline, which is used for solving the technical problem that the wall thickness of the pipeline needs to be continuously increased to increase the internal pressure resistance of the pipeline, thereby greatly increasing the cost and weight of the pipeline.

[0008] The utility model discloses a carbon fiber plate winding reinforced pipeline, which comprises an inner liner pipe, a carbon fiber plate is spirally wound on the outer wall of the inner liner pipe, and a protective layer is arranged on the outer side wall of the carbon fiber plate.

[0009] Optionally, an outer frame is arranged on the outer side of the carbon fiber plate.

[0010] The outer frame is coaxially arranged with the inner liner pipe, and the protective layer is filled between the outer frame and the carbon fiber plate.

[0011] Optionally, the inner liner pipe is any one of a ribless metal single-layer pipe, a ribbed metal single-layer pipe, a non-metal single-layer pipe, a reinforced concrete single-layer pipe and a single-steel cylinder concrete pipe.

[0012] Optionally, the carbon fiber plate is wound in any one of a single-layer sparse winding, a single-layer tight winding, a multi-layer tight winding and a plate-type laminated winding.

[0013] Optionally, the outer frame is a truss structure or a Hauf structure.

[0014] Optionally, the outer frame is a truss structure, and the outer frame comprises a plurality of circular trusses or rectangular trusses arranged at intervals.

[0015] The circular truss comprises an inner circular ring and an outer circular ring arranged coaxially, the inner circular ring and the outer circular ring are connected by a plurality of connecting rods, and the plurality of inner circular rings and the plurality of outer circular rings are connected by support rods.

[0016] The rectangular truss comprises an outer frame and an inclined rod arranged on the outer frame, and a plurality of outer frames are sequentially connected at the head and tail.

[0017] Optionally, the outer frame is a Hauf structure, and the outer frame comprises two polygonal connecting plates arranged symmetrically.

[0018] The two polygonal connecting plates are connected by a flange plate and bolts, and the two polygonal connecting plates form a polygonal tubular sleeve after being connected.

[0019] Optionally, the inner liner pipe is provided with a connecting flange at both ends, and a plurality of bolt holes are arranged in an annular array along the axis of the connecting flange.

[0020] Optionally, the inner liner pipe is provided with a connecting male head and a connecting female head at both ends, respectively.

[0021] The outer wall of the male connector is sleeved with an annular sealing ring, and when the pipelines are connected, the male connector of one pipeline is inserted into the female connector of the other pipeline.

[0022] Optionally, the carbon fiber plate is implanted with an optical fiber sensor.

[0023] Due to the above technical solutions, the utility model has the following advantages:

[0024] 1. The carbon fiber plate is spirally wound on the outer wall of the inner lining pipe, and the carbon fiber plate and the inner lining pipe form a combined structure, which can work together under internal pressure, greatly improve the internal pressure resistance of the pipeline, greatly reduce the weight and cost of the pipeline, and reduce the cost of installation and transportation.

[0025] 2. Relying on the strength and rigidity of the inner lining pipe, the carbon fiber plate can be conveniently wound on the outer wall of the inner lining pipe, and the inner lining pipe does not need to be pulled out, which can greatly improve the production efficiency of the combined pipeline, which is more than 100 times the efficiency of the carbon fiber filament winding process, greatly shortens the product manufacturing cycle, and significantly reduces the cost.

[0026] 3. The carbon fiber plate wound on the inner lining pipe is a finished product carbon fiber plate made by pultrusion process, and the tensile strength is much higher than that of the general on-site wet laying carbon fiber thin-walled shell structure (because the laying angle of the carbon fiber filament is variable, which will greatly reduce the hoop strength), which can fully utilize the high strength performance of carbon fiber to resist high internal pressure of the pipeline.

[0027] 4. Due to the high tensile strength of the carbon fiber plate, the material of the inner lining pipe can be greatly reduced. For example, the original DN4000 steel pipe has a wall thickness of 30mm, and after being replaced by a carbon fiber plate reinforced steel pipe, the carbon fiber thickness is 2mm, and the wall thickness of the inner lining steel pipe can be reduced to 3mm, the weight of the pipeline will be greatly reduced, the cost will be reduced, and the transportation and installation cost will be greatly reduced.

[0028] 5. When the carbon fiber combined pipeline needs to be buried, a ribbed ring can be added on the outer wall of the inner lining steel pipe at intervals to make up for the insufficient external pressure resistance caused by the thinning of the pipe wall; further, an external support frame can be arranged outside the combined pipeline to resist external load and avoid direct bearing of external load by the combined pipeline.

[0029] 6. The carbon fiber plate is corrosion resistant and has excellent durability even in complex soil environment. The risk of pipe burst caused by corrosion and fracture of prestressed steel wire is avoided.

[0030] 7. In order to simplify the processing and assembly of the external support frame, the application adopts a sleeved external support frame or a half structure to realize rapid processing and assembly.

[0031] 8、The application can monitor the pressure of the pipeline, the stress of the carbon fiber plate, the pipeline leakage and other parameters through the optical fiber sensing pre-embedded in the carbon fiber plate, which is beneficial to the long-term health monitoring of the pipeline.

[0032] Other advantages, objects and features of the present application will be apparent from the following specification, and will be apparent to those skilled in the art, based on the teachings herein, or will be learned from the practice of the present application. The objects and other advantages of the present application will be realized and attained by the methods and compositions particularly pointed out in the following specification. BRIEF DESCRIPTION OF DRAWINGS

[0033] The drawings of the present application are as follows.

[0034] Figure 1 It is a structural schematic view of the carbon fiber plate wound by the ribbed metal single-layer pipe of the present application.

[0035] Figure 2 It is a structural schematic view of the carbon fiber plate wound by the ribbed metal single-layer pipe of the present application.

[0036] Figure 3 It is a structural schematic view of the flange bolted connection assembly of the present application.

[0037] Figure 4 It is a structural schematic view of the socket connection assembly of the present application.

[0038] Figure 5 It is a structural schematic view of the rectangular truss of the present application.

[0039] Figure 6 It is a structural schematic view of the haaf structure of the present application.

[0040] In the figure: 1 - inner lining pipe; 2 - carbon fiber plate; 3 - protective layer; 4 - outer frame; 41 - circular truss; 411 - inner circular ring; 412 - outer circular ring; 42 - support rod; 43 - polygonal connecting plate; 44 - rectangular truss; 441 - outer frame; 442 - inclined rod; 5 - connecting flange; 501 - bolt hole; 61 - connecting male head; 62 - connecting female head; 7 - ribbed ring. DETAILED DESCRIPTION

[0041] The present application will be further described below in combination with the drawings and examples.

[0042] Example 1:

[0043] As Figure 1 and Figure 2The carbon fiber plate winding reinforced pipeline shown comprises an inner liner pipe 1, the outer wall of which is spirally wound with a carbon fiber plate 2, and the outer wall of the carbon fiber plate 2 is provided with a protective layer 3.

[0044] In the embodiment, the carbon fiber plate 2 is made by pultrusion process, and the optical fiber sensor is pre-implanted between the carbon fiber filaments during production, which can monitor the data of pipeline cracks, leakage, vibration, pressure, temperature and the like in real time.

[0045] In the embodiment, the carbon fiber plate 2 is spirally wound on the inner liner pipe 1 at a winding angle greater than 85° and less than 90°, and the spirally wound mode is any one of single-layer sparse winding, single-layer tight winding, multi-layer tight winding and plate type overlapping winding. Among them: the single-layer sparse winding is single-layer winding with winding spacing between the side walls of the spirally wound carbon fiber plate 2; the single-layer tight winding is single-layer winding without winding spacing between the side walls of the spirally wound carbon fiber plate 2; the multi-layer tight winding is multi-layer winding without winding spacing between the side walls of the spirally wound carbon fiber plate 2, and the multi-layer winding is spirally wound from the starting end to the end, then spirally wound from the end to the starting end, and the above steps are repeated until the number of winding layers reaches the predetermined number of layers. The plate type overlapping winding is that the adjacent carbon fiber plates 2 are partially overlapped in spirally winding, the width of the overlapping lap is between 2-3mm, and the sealing type of the whole pipeline is improved by setting the lap width, and the mechanical properties of the carbon fiber layer are also improved, and the technical problem of easy breakage caused by weak compression strength of the joint position of the side walls of the adjacent carbon fiber plates 2 or carbon fiber filaments in tight winding is solved.

[0046] In the embodiment, the inner liner pipe 1 is any one of a ribless metal single-layer pipe, a ribbed metal single-layer pipe, a non-metal single-layer pipe, a single-steel cylinder concrete pipe and a reinforced concrete single-layer pipe. Among them: the metal single-layer pipe includes aluminum alloy, steel, stainless steel and cast iron, etc. The ribless metal single-layer pipe is a metal pipe without ribbed rings on the outer wall of the inner liner pipe 1; the ribbed metal single-layer pipe is a metal pipe with a plurality of ribbed rings 7 fixedly installed on the outer wall of the inner liner pipe 1 along the axial direction in sequence; the non-metal single-layer pipe is a pipe made of composite plastic material (PE, PVC, HDPE, etc.); the single-steel cylinder concrete pipe is a pipe with a steel cylinder wrapped with concrete; and the reinforced concrete single-layer pipe is a pipe formed by pouring concrete into a frame composed of steel bars.

[0047] In the embodiment, the protective layer 3 is a filled ordinary foam layer with heat preservation function, which can prevent the water body in the pipeline from freezing in freezing and thawing areas, and effectively prevent the carbon fiber layer from being damaged by direct collision during transportation or installation, thereby affecting the mechanical properties.

[0048] As Figure 1As shown, both ends of the pipe are also provided with connecting components for connecting adjacent pipes. These connecting components are either socket-type or flange-bolted connecting components. In one embodiment of this invention, the socket-type connecting component includes a male connector 61 and a female connector 62 located at both ends of the inner liner pipe 1. An annular sealing ring is fitted onto the outer wall of the male connector 61. During pipe connection, the male connector 61 of one pipe is inserted into the female connector 62 of the other pipe. In another embodiment of this invention, the bolted connecting component includes connecting flanges 5 located at both ends of the inner liner pipe 1. Several bolt holes 501 are arranged in a circular array along the axis of the connecting flanges 5. During pipe connection, the connecting flanges 5 of adjacent pipes are connected by bolts.

[0049] Example 2:

[0050] like Figure 3 , Figure 4 and Figure 5 The carbon fiber plate wound reinforced pipe shown includes an inner liner 1, on the outer wall of the inner liner 1 a carbon fiber plate 2 is spirally wound, and an outer frame 4 is sleeved on the outer side of the carbon fiber plate 2.

[0051] The outer frame 4 is coaxially arranged with the inner liner tube 1, and a protective layer 3 is filled between the outer frame 4 and the carbon fiber plate 2.

[0052] In this embodiment, the carbon fiber plate 2 is made by pultrusion process. During production, optical fiber sensors are pre-embedded between the carbon fiber filaments. The optical fiber sensors can monitor data such as pipe cracks, leaks, vibration, pressure, and temperature in real time.

[0053] In this embodiment, the carbon fiber plate 2 is spirally wound onto the inner liner tube 1 at a winding angle greater than 85° and less than 90°. The spiral winding method can be any one of single-layer sparse winding, single-layer tight winding, multi-layer tight winding, and plate-type overlapping winding. Specifically: single-layer sparse winding is a single-layer winding with a winding gap between the sidewalls of the spiral carbon fiber plate 2; single-layer tight winding is a single-layer winding without a winding gap between the sidewalls of the spiral carbon fiber plate 2; multi-layer tight winding is a multi-layer winding without a winding gap between the sidewalls of the spiral carbon fiber plate 2. In multi-layer winding, the spiral winding begins from the starting end to the end, and then repeats from the end to the starting end until the predetermined number of winding layers is reached. Plate-type overlapping winding involves partial overlap between adjacent spirally wound carbon fiber plates 2, with an overlap width between 2-3 mm. Setting this overlap width improves the overall sealing of the pipe and enhances the mechanical properties of the carbon fiber layer, solving the technical problem of weak compressive strength at the joints of adjacent carbon fiber plates 2 or carbon fiber filament sidewalls during tight winding, leading to easy breakage.

[0054] In the embodiment, the inner lining pipe 1 is any one of a ribless metal single-layer pipe, a ribbed metal single-layer pipe, a non-metal single-layer pipe, a single-steel cylinder concrete pipe and a reinforced concrete single-layer pipe. The metal single-layer pipe includes aluminum alloy, steel, stainless steel, cast iron and the like. The ribless metal single-layer pipe is a metal pipe without ribbed rings on the outer wall of the inner lining pipe 1. The ribbed metal single-layer pipe is a metal pipe with a plurality of ribbed rings 7 fixedly installed along the axis direction of the inner lining pipe 1 in sequence. The non-metal single-layer pipe is a pipe made of composite plastic material (PE, PVC, HDPE and the like). The single-steel cylinder concrete pipe is a pipe with a steel cylinder wrapped with concrete. The reinforced concrete single-layer pipe is a pipe formed by pouring concrete into a frame made of steel bars.

[0055] In the embodiment, the protective layer 3 is a filled ordinary foam insulation layer. By using the large deformation characteristics of the foam, an insulation layer is formed between the outer frame and the carbon fiber reinforced pipe, so that the external load is mainly borne by the outer frame, and the carbon fiber pipe is protected from external load.

[0056] As shown in FIGS. Figure 4 , 5 , 6, the outer frame 4 is a truss structure or a hauf structure. As an embodiment of the present application, the outer frame 4 is a truss structure. The outer frame 4 includes a plurality of circular ring trusses 41 fixedly installed in sequence and a plurality of support rods 42 for connecting the circular ring trusses 41. The plurality of support rods 42 are arranged in a ring array along the axis of the circular ring truss 41. The circular ring truss 41 includes an inner layer circular ring 411 and an outer layer circular ring 412 arranged coaxially. The inner layer circular ring 411 and the outer layer circular ring 412 are connected by a plurality of connecting rods. The plurality of inner layer circular rings 411 and the plurality of outer layer circular rings 412 are connected by the support rods 42, respectively.

[0057] As another embodiment of the present application, the outer frame 4 is a truss structure. The outer frame 4 includes a plurality of rectangular trusses 44. The rectangular truss 44 includes an outer layer frame 441 and a diagonal rod 442 arranged on the outer layer frame 441. The plurality of outer layer frames 441 are connected in sequence.

[0058] As still another embodiment of the present application, the outer frame 4 is a hauf structure. The outer frame 4 includes two polygonal connecting plates 43 arranged symmetrically.

[0059] The two polygonal connecting plates 43 are connected by a flange plate and bolts. After the two polygonal connecting plates 43 are connected, a polygonal tubular sleeve is formed.

[0060] As shown in FIGS. Figure 3 , 4 The two ends of the pipe are also provided with a connecting assembly for connecting adjacent pipes. The connecting assembly is a bolted connecting assembly or a socketed connecting assembly.

[0061] As an embodiment of the present application, the socket connection assembly comprises a male connector 61 and a female connector 62 arranged at both ends of the inner liner pipe 1, and the outer wall of the male connector 61 is sleeved with an annular sealing ring, and when the pipes are connected, the male connector 61 of one pipe is inserted into the female connector 62 of the other pipe.

[0062] In the embodiment, the over connection sections are arranged at both ends of the inner liner pipe 1 for mounting the male connector 61 and the female connector 62.

[0063] As another embodiment of the present application, the bolt connection assembly comprises a connecting flange 5 arranged at both ends of the inner liner pipe 1, and a plurality of bolt holes 501 are arranged along the axis of the connecting flange 5 in an annular array, and when the pipes are connected, the connecting flanges 5 of adjacent pipes are connected by bolts.

[0064] In the embodiment, the inner ring of the connecting flange 5 is fixedly connected with the outer wall of the inner liner pipe 1, and when the outer frame 4 is a truss structure, the end surface of the connecting flange 5 is connected with the support rod 42.

[0065] In the embodiment, for a carbon fiber plate winding combined pipe, the pipe diameter is D, the radius is R, the steel plate thickness is e1, the carbon fiber plate winding thickness is e2, the unit length is L, and the limit pressure bearing capacity is:

[0066]

[0067] The pipe parameters are set as follows: R=400mm, the material is Q355 steel, [σ1]=355MPa, e1=2mm; the first carbon fiber plate, [σ2]=2400MPa, e2=1.2mm; and the limit pressure bearing capacity of the pipe is:

[0068]

[0069] It can be found from the above calculation that the pressure bearing capacity provided by the steel is much smaller than the pressure bearing capacity provided by the carbon fiber plate. Therefore, the use amount of the steel plate can be greatly reduced and the pressure bearing capacity of the pipe can be improved by the carbon fiber plate winding combined pipe.

[0070] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application and not to limit them, although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the specific embodiments of the present application can be modified or replaced, and any modification or equivalent replacement without departing from the spirit and scope of the present application should be covered in the protection scope of the claims of the present application.

Claims

1. A carbon fiber plate wound reinforced pipe, characterized in that, It includes an inner liner tube (1), on the outer wall of the inner liner tube (1) a carbon fiber plate (2) is spirally wound, and on the outer wall of the carbon fiber plate (2) a protective layer (3) is provided. The carbon fiber plate (2) is fitted with an outer frame (4) on the outside. The outer frame (4) is coaxially arranged with the inner liner tube (1). The protective layer (3) is filled between the outer frame (4) and the carbon fiber plate (2). Both ends of the inner liner tube (1) are provided with connecting flanges (5).

2. The carbon fiber plate wound reinforced pipe according to claim 1, characterized in that, The inner lining pipe (1) is any one of the following: unribbed metal single-layer pipe, ribbed metal single-layer pipe, non-metallic single-layer pipe, reinforced concrete single-layer pipe, and single steel cylinder concrete pipe.

3. The carbon fiber plate wound reinforced pipe according to claim 1, characterized in that, The winding of the carbon fiber plate (2) can be any one of single-layer sparse winding, single-layer tight winding, multi-layer tight winding and plate-type composite winding.

4. The carbon fiber plate wound reinforced pipe according to claim 1, characterized in that, The outer frame (4) is a truss structure or a half structure.

5. A carbon fiber plate wound reinforced pipe according to claim 4, characterized in that, The outer frame (4) is a truss structure, and the outer frame (4) includes several circular trusses (41) or rectangular trusses (44) arranged at intervals. The circular truss (41) includes an inner circular ring (411) and an outer circular ring (412) arranged coaxially. The inner circular ring (411) and the outer circular ring (412) are connected by several connecting rods. Several inner circular rings (411) and several outer circular rings (412) are connected by support rods (42). The rectangular truss (44) includes an outer frame (441) and diagonal braces (442) arranged on the outer frame (441), with several outer frames (441) connected end to end in sequence.

6. A carbon fiber plate wound reinforced pipe according to claim 4, characterized in that, The outer frame (4) is a half structure, and the outer frame (4) includes two symmetrically arranged polygonal connecting plates (43). The two polygonal connecting plates (43) are connected by flange plates and bolts, and the two polygonal connecting plates (43) together form a polygonal tubular sleeve.

7. A carbon fiber plate wound reinforced pipe according to claim 1, characterized in that, The connecting flange (5) has a number of bolt holes (501) arranged in a ring array along its axis.

8. A carbon fiber plate wound reinforced pipe according to claim 2, characterized in that, The inner liner tube (1) is provided with a male connector (61) and a female connector (62) at both ends. The outer wall of the male connector (61) is fitted with an annular sealing ring. When connecting pipes, the male connector (61) of one pipe is inserted into the female connector (62) of another pipe.

9. A carbon fiber plate wound reinforced pipe according to claim 1, characterized in that, The carbon fiber plate (2) is embedded with an optical fiber sensor.

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