CN113276439A

CN113276439A - Composite material winding pipe, inflatable core mold and processing method of composite material winding pipe

Info

Publication number: CN113276439A
Application number: CN202110551294.7A
Authority: CN
Inventors: 冯鹏; 李志远; 胡利
Original assignee: Tsinghua University
Current assignee: Tsinghua University
Priority date: 2021-05-19
Filing date: 2021-05-19
Publication date: 2021-08-20

Abstract

The invention discloses a composite material winding pipe, an inflatable core mold and a processing method of the composite material winding pipe, wherein the composite material winding pipe comprises a first structural layer, a second structural layer and a shear key, the second structural layer is connected outside the first structural layer, the shear key comprises a matching part and a fixing part, the matching part is connected between the first structural layer and the second structural layer, one end of the fixing part is connected with the matching part, and the other end of the fixing part extends out of the first structural layer in the direction far away from the second structural layer. The composite material winding pipe provided by the embodiment of the invention is used for pouring concrete inside to form a composite material winding pipe-concrete combined member, the internal shear key is arranged to improve the integrity and mechanical property of the composite material winding pipe-concrete combined member, part of the structure of the shear key extends out of the first structural layer and is cured together with the first structural layer, the shear key cannot damage the composite material winding pipe in the assembling process, and the shear key is tightly combined with the composite material winding pipe, so that the structural strength of the winding pipe is improved.

Description

Composite material winding pipe, inflatable core mold and processing method of composite material winding pipe

Technical Field

The invention belongs to the technical field of building materials, and particularly relates to a composite material winding pipe, an inflatable core mold and a processing method of the composite material winding pipe.

Background

The composite material winding pipe has the advantages of good corrosion resistance, light weight, processability, easy design, stable performance and the like, is widely applied to the industries of oil and gas transportation, petrochemical industry, civil construction and the like, and is usually combined with concrete to form a composite material-concrete combined member (a beam, a column, a shear wall and the like) when being applied to the field of civil construction, wherein the composite material winding pipe is used for restraining concrete, so that the composite material-concrete combined member has good mechanical properties.

However, the composite material winding pipe in the prior art is made of composite materials, so that the surface of the composite material winding pipe is smooth, the composite material winding pipe is easy to have an interface slippage phenomenon in the process of being combined with concrete, and the mechanical property of the composite material-concrete combined member is greatly reduced.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the composite material winding pipe has high structural strength, the mechanical property of the composite material-concrete combined member can be greatly improved when the composite material winding pipe is combined with concrete to form the composite material-concrete combined member, and the technical problem that the interface slippage phenomenon is easy to occur in the process of combining the composite material winding pipe with concrete due to the smooth surface of the composite material winding pipe in the prior art is solved.

A second object of the invention is to provide an inflatable core mould.

The third purpose of the invention is to provide a method for processing the composite material winding pipe.

A composite material wound pipe according to an embodiment of the invention comprises: a first structural layer; the second structural layer is connected outside the first structural layer; the shear key comprises a matching part and a fixing part, the matching part is connected between the first structural layer and the second structural layer, one end of the fixing part is connected with the matching part, and the other end of the fixing part faces away from the second structural layer and extends out of the first structural layer.

According to the composite material winding pipe provided by the embodiment of the invention, the shear key is arranged on the composite material winding pipe, the matching part of the shear key is connected between the first structural layer and the second structural layer, the first structural layer and the second structural layer are matched to limit the position of the shear key, so that the position of the shear key is stable relative to the composite material winding pipe, the structural strength of the composite material winding pipe is increased, one end of the fixing part on the shear key is connected to the matching part, the other end of the fixing part extends out of the first structural layer, when the subsequent composite material winding pipe is combined with concrete to form a composite material-concrete combined member, the shear key can generate stable mechanical anchoring at the contact part of the composite material winding pipe and the concrete, the contact area of the composite material winding pipe and the concrete is increased, the interface performance is greatly improved, and the slippage phenomenon of an interface is avoided, the integrity and the mechanical property of the composite material-concrete combined member are obviously improved. The composite material winding pipe has the advantages of good corrosion resistance, high hoop strength, good integrity and high inner interface shear strength.

According to the composite material winding pipe of one embodiment of the invention, the fitting part is a sheet structure, and the sheet structure is fitted between the first structural layer and the second structural layer.

Optionally, the composite material winding pipe is a cylindrical pipe, the matching portion is a thin sheet with curvature, and two opposite side surfaces of the matching portion are respectively attached to the first structural layer and the second structural layer.

Optionally, the length of the fixing part extending out of the first structural layer is smaller than the radius of the composite material winding pipe, and an anchoring end is formed at one end of the fixing part far away from the matching part.

According to the composite material winding pipe of one embodiment of the invention, the fixing part is rod-shaped or sheet-shaped.

According to one embodiment of the invention, the composite material winding pipe comprises a plurality of shear keys, and the plurality of shear keys are arranged on the first structural layer at intervals; the plurality of matching parts of at least part of the shear key are arranged at intervals along the length direction of the first structural layer.

Optionally, a plurality of the fixing portions are arranged in a matrix form on the first structural layer; or a plurality of fixing parts are arranged on the first structural layer in a staggered mode.

According to the composite material winding pipe, the shear key is at least one of a steel shear key, an FRP shear key or a plastic shear key.

According to one embodiment of the composite wound pipe, the first structural layer and the second structural layer comprise at least one inorganic fiber wound layer and/or at least one organic fiber wound layer.

Optionally, the composite wound tube further comprises at least one resin layer attached to the second structural layer.

An inflatable mandrel according to an embodiment of the present invention, mountable on a winding machine, comprises: the air bag is provided with an air valve capable of inflating and deflating, an inflation cavity is formed inside the air bag, the surface of the air bag is recessed towards the direction of the inflation cavity to form a fixing groove, and the fixing part in the composite material winding pipe can be positioned in the fixing groove.

According to the inflatable core mold disclosed by the embodiment of the invention, the fixing grooves are formed on the surface of the air bag, on one hand, in the process of producing the composite material winding pipe, the fixing grooves are used for positioning the fixing parts in the composite material winding pipe so as to limit the positions of the shear keys, and the stable positions of the shear keys in the process of producing the composite material winding pipe are ensured; on the other hand, the fixing groove can also play a role of avoiding shear keys, so that the other end of the fixing part can be ensured to smoothly extend out of the first structural layer in the process of extending out of the first structural layer in the direction away from the second structural layer, namely, the shear keys are conveniently formed in the composite material winding pipe in the process of producing the composite material winding pipe, and the phenomenon of interface slippage can not occur when the composite material winding pipe is combined with concrete to form a composite material-concrete combined member.

The processing method of the composite material winding pipe comprises the following steps: s1, inflating the inflatable core mold by adopting the inflatable core mold, wherein the inflatable core mold is fixedly arranged on a winding machine; s2, winding continuous long fibers on the inflatable core mold by adopting a wet circumferential winding method to form the uncured first structural layer; s3, placing a plurality of shear keys on the outer peripheral surface of the uncured first structural layer at intervals, and positioning the fitting portions on the outer peripheral surface of the uncured first structural layer, wherein one end of the fixing portion is fitted in the fixing groove; s4, winding continuous long fibers on the matching part and the outer peripheral surface of the uncured first structural layer by adopting a wet circumferential winding method to form an uncured second structural layer, and enabling the matching part to be located between the uncured first structural layer and the uncured second structural layer; s5, removing the inflatable core mould from the winding machine; s6, performing high-temperature curing on the uncured first structural layer and the uncured second structural layer; and S7, exhausting the inflatable core mold, separating the inflatable core mold from the first structural layer and the matching part, and forming the composite material winding pipe by the cured first structural layer, the cured second structural layer and the shear keys.

According to the processing method of the composite material winding pipe provided by the embodiment of the invention, before the composite material winding pipe is produced, the inflatable core mould is inflated and installed on the winding machine, the winding machine can drive the inflatable core mould to rotate in the working process, so that continuous long fibers can be wound on the inflatable core mould and form an uncured first structural layer, then a plurality of shear keys are arranged on the outer peripheral surface of the uncured first structural layer at intervals, fixing parts of the shear keys are matched in fixing grooves on the surface of an air bag, after the fixation of the shear keys is finished, a layer of continuous long fibers is wound on the matching parts and the outer peripheral surface of the uncured first structural layer to form an uncured second structural layer, the first structural layer and the second structural layer are matched to limit the positions of the shear keys, so that the positions of the shear keys are stable relative to the composite material winding pipe, after the winding of the second structural layer is finished, the inflatable core mould is taken down from the winding machine and the first structural layer and the second structural layer are cured at high temperature, and after the high-temperature curing is finished, exhausting the inflatable core mold, wherein the fixing part on the shear key can be separated from the fixing groove, and the cured first structural layer, the cured second structural layer and the shear key can be separated from the inflatable core mold to form the composite material winding pipe. The processing method of the composite material winding pipe is matched with the inflatable core mold to form the composite material winding pipe with the shear key, so that the phenomenon of interface slippage is avoided when the composite material winding pipe and concrete are combined for use, and the structural strength and the mechanical property of the composite material-concrete combined member are improved.

Additional aspects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural view of a composite material wound pipe according to an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a shear key according to an embodiment of the present invention.

FIG. 3 is a partial cross-sectional view of a shear key attached to a wound composite tube according to one embodiment of the invention.

Figure 4 is a schematic view of an inflated mandrel configuration according to one embodiment of the present invention.

Fig. 5 is a schematic flow chart of a method for processing a composite material wound pipe according to an embodiment of the present invention.

Figure 6 is a schematic view of a first structural layer wrapped around an inflated mandrel according to one embodiment of the present invention.

FIG. 7 is a schematic view of a shear key mated to a first structural layer in accordance with one embodiment of the present invention.

Fig. 8 is a schematic view of a composite material winding tube wound around an inflatable mandrel according to an embodiment of the present invention.

Reference numerals:

100. a composite wound tube;

1. a first structural layer;

2. a second structural layer;

3. a shear key;

31. a fitting portion; 32. a fixed part;

200. inflating the core mold;

210. an air bag;

2101. an air valve; 2102. fixing grooves;

220. and (5) fixing the column.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "length", "width", "thickness", "upper", "lower", "inner", "outer", "circumferential", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

A composite wound pipe 100 according to an embodiment of the invention is described below with reference to the drawings.

A composite wound pipe 100, as shown in fig. 1, in accordance with an embodiment of the present invention, comprises: the structural member comprises a first structural layer 1, a second structural layer 2 and a shear key 3.

As shown in fig. 1, the second structural layer 2 is connected to the outside of the first structural layer 1. Here, the second structural layer 2 is located outside the first structural layer 1.

As shown in fig. 1 and 2, the shear key 3 includes a fitting portion 31 and a fixing portion 32, the fitting portion 31 is connected between the first structural layer 1 and the second structural layer 2, one end of the fixing portion 32 is connected to the fitting portion 31, and the other end of the fixing portion 32 extends from the first structural layer 1 toward a direction away from the second structural layer 2. Here, the fixing portion 32 passes through the first structural layer 1 and extends toward a side of the first structural layer 1 away from the second structural layer 2.

As can be seen from the above structure, in the composite material winding pipe 100 according to the embodiment of the present invention, the second structural layer 2 is connected to the outside of the first structural layer 1, so that the second structural layer 2 can protect the first structural layer 1 in a first aspect, and the service life of the first structural layer 1 is prolonged; in a second aspect, the second structural layer 2 may enhance the structural strength of the composite material winding pipe 100, and improve the mechanical properties of the composite material winding pipe 100; in a third aspect, the second structural layer 2 and the first structural layer 1 cooperate to define the position of the shear key 3, ensuring that the shear key 3 is positioned stably on the composite wound pipe 100.

By connecting the matching part 31 between the first structural layer 1 and the second structural layer 2, the first structural layer 1 and the second structural layer 2 are matched to define the position of the matching part 31, that is, the position of the shear key 3, so that after the subsequent composite material winding pipe 100 is produced, the position of the shear key 3 can be fixed without arranging other fixing pieces, and the position of the shear key 3 relative to the composite material winding pipe 100 is stable.

One end of the fixing part 32 on the shear key 3 extends out of the first structural layer 1 towards the direction far away from the second structural layer 2, the fixing part 32 is used for increasing the roughness of the surface of the composite material winding pipe 100, after concrete is poured inside the composite material winding pipe 100 to form a composite material-concrete combined component, the fixing part 32 extending out of the first structural layer 1 can provide stable mechanical anchoring, the interface performance is greatly improved, the interface slippage phenomenon is avoided, and meanwhile, the integrity and the mechanical performance of the composite material-concrete combined component can be obviously improved by the shear key 3.

The mechanical properties include rigidity, strength, deformability, and the like.

It can be understood that, for the composite material winding pipe 100 of the present application, compared with the prior art, a part of the structure of the shear key 3 is embedded into the composite material winding pipe 100, and another part of the structure of the shear key 3 extends out from the first structural layer 1 towards the direction away from the second structural layer 2, so as to obtain the composite material winding pipe 100 with good integrity and high internal interface shear strength.

Specifically, the first structural layer 1 and the second structural layer 2 are formed by winding continuous long fibers.

It should be noted that, in other examples, the composite material winding pipe 100 is not limited to the first structural layer 1 and the second structural layer 2, and may also include a third structural layer, a fourth structural layer, and the like, which are not limited herein. For example: the third structural layer is connected outside the second structural layer 2, and the fourth structural layer is connected outside the third structural layer, as long as guarantee that the cooperation portion 31 of shear force key 3 is located between two-layer structural layer, the fixed part 32 orientation of shear force key 3 is kept away from the direction of outermost structural layer and is stretched out from first structural layer 1 can.

In the description of the invention, features defined as "first", "second", "third" and "fourth" may explicitly or implicitly include one or more of the features for distinguishing between the described features, whether sequential or not.

In some embodiments of the present invention, as shown in fig. 2 and 3 in combination, the fitting portion 31 is a sheet structure that fits between the first structural layer 1 and the second structural layer 2. Here, the matching portion 31 has a certain length and width, but the thickness of the matching portion 31 is much smaller than the length or width of the matching portion 31, so that the contact area between the matching portion 31 and the first structural layer 1 and the second structural layer 2 can be increased, the connection strength between the matching portion 31 and the first structural layer 1 and the second structural layer 2 can be improved, and the distance between the first structural layer 1 and the second structural layer 2 can be reduced by the matching portion 31 with a smaller thickness, and the first structural layer 1 and the second structural layer 2 can be closely attached together after being cured at a high temperature to form an integral structure, so as to increase the structural strength of the composite material winding pipe 100.

Alternatively, as shown in fig. 1 and 3, the composite material winding pipe 100 is a cylindrical pipe, the fitting portion 31 is a thin sheet with curvature, and two opposite sides of the fitting portion 31 are respectively attached to the first structural layer 1 and the second structural layer 2. In the first aspect, the fitting portion 31 is more tightly connected between the first structural layer 1 and the second structural layer 2, that is, the shear key 3 is ensured to be firmly fixed, the structural stability of the composite material wound pipe 100 is improved, and the structural strength of the composite material wound pipe 100 is increased; in the second aspect, the distance between the first structural layer 1 and the second structural layer 2 can be further reduced, and the subsequent first structural layer 1 and the second structural layer 2 can be closely attached together after being cured at a high temperature to form an integral structure, so as to increase the structural strength of the composite material winding pipe 100; in a third aspect, after the thin sheet with curvature is fixed on the first structural layer 1, the shear key 3 does not affect the winding of the subsequent second structural layer 2.

Optionally, the curvature of the fitting portion 31 is equal to the curvature of the first structural layer 1 and the second structural layer 2. After the matching part 31 is connected between the first structural layer 1 and the second structural layer 2, two opposite side surfaces of the matching part 31 can be respectively and tightly attached to the first structural layer 1 and the second structural layer 2.

It should be noted that the composite material winding pipe 100 is not limited to the above cylindrical pipe, in other examples, the composite material winding pipe 100 may also be a square pipe or a pipe with other shape, when the composite material winding pipe 100 is formed into a square pipe, the matching portion 31 may be a sheet with a rectangular shape, and it is ensured that two opposite side surfaces of the matching portion 31 can respectively fit the first structural layer 1 and the second structural layer 2.

Optionally, the length of the anchoring portion 32 extending beyond the first structural layer 1 is less than the radius of the composite wound pipe 100. Here means that when the composite material winding pipe 100 is a cylindrical pipe, the length of the fixing part 32 extending out of the first structural layer 1 is smaller than the radius of the composite material winding pipe 100, and by setting the length of the fixing part 32, on the first hand, the volume of the fixing part 32 can be reduced, the material of the fixing part 32 can be reduced, and the production cost of the composite material winding pipe 100 can be saved; in the second aspect, the fixing portion 32 with a smaller volume occupies less internal space of the composite material winding pipe 100, so that more concrete can be poured into the composite material winding pipe 100, and the structural strength of the composite material-concrete combined member is increased; in a third aspect, a plurality of shear keys 3 may be disposed on the composite material winding pipe 100, and the plurality of shear keys 3 may not be in contact with each other, so that the fixing grooves 2102 for fitting the fixing portion 32 may be conveniently disposed on the inflatable core mold 200, and the plurality of fixing grooves 2102 are independent from each other, that is, it is ensured that the inflatable core mold 200 does not leak air after being inflated.

In the description of the present invention, "a plurality" means two or more unless otherwise specified.

Of course, the length of the fixing portion 32 is not too short, and it is necessary to ensure that a part of the structure of the fixing portion 32 can be extended into the interior of the concrete when the concrete is poured into the interior of the composite material winding pipe 100. The specific length of the fixing portion 32 is not particularly limited, and the skilled person can select the length according to the size of the composite material wound pipe 100 and the number and positions of the shear keys 3 arranged on the composite material wound pipe 100.

Optionally, an end of the fixation portion 32 remote from the mating portion 31 forms an anchoring end. After the composite material winding pipe 100 is combined with concrete to form a composite material-concrete combined member, the anchoring end extends into the concrete, and stable mechanical anchoring is generated at the interface of the composite material winding pipe 100 and the concrete, so that the interface performance is greatly improved, and the integrity and the mechanical performance of the composite material-concrete combined member are improved.

In some embodiments of the present invention, the fixing portion 32 is rod-shaped or sheet-shaped. The fixing portion 32 is formed in a rod-like structure as shown in fig. 2, so that the fixing portion 32 has a certain length, and when the composite material winding pipe 100 is combined with concrete to form a composite material-concrete combined member, the fixing portion 32 having a certain length can be anchored in the concrete, increase the contact area between the concrete and the composite material winding pipe 100, provide the shearing resistance of the interface, generate a stable mechanical anchoring at the interface between the composite material winding pipe 100 and the concrete, greatly improve the interface performance, and avoid the occurrence of the interface slip phenomenon.

In other examples, the shape of the fixing portion 32 is not limited to the rod-like shape or the sheet-like shape, and the shape of the fixing portion 32 may be selected according to practical engineering requirements, and is not particularly limited herein.

In some embodiments of the present invention, as shown in fig. 1, the shear key 3 includes a plurality of shear keys 3 arranged at intervals on the first structural layer 1; the plurality of fitting portions 31 of at least some of the shear keys 3 are arranged at intervals in the longitudinal direction of the first structural layer 1. The plurality of shear keys 3 are matched, so that the structural strength of the composite material winding pipe 100 can be further improved, and the mechanical property of the composite material winding pipe 100 can be improved; on the other hand, when the composite material winding pipe 100 is combined with concrete to form a composite material-concrete combined member, the part of the fixing portions 32 of the plurality of shear keys 3 can simultaneously extend into the concrete, and a stable mechanical anchoring is generated between the interface of the composite material winding pipe 100 and the concrete, thereby greatly improving the interface performance.

Alternatively, a plurality of fixing portions 32 are arranged in a matrix form on the first structural layer 1. That is, a plurality of shear keys 3 are arranged in a matrix form on the composite wound pipe 100, so that the shear keys 3 can produce stable mechanical anchoring at the interface between the composite wound pipe 100 and concrete.

In specific examples, the plurality of fixing portions 32 are provided at intervals in the circumferential direction and the longitudinal direction of the first structural layer 1. Such that a plurality of anchoring portions 32 are arranged in a matrix form on the first structural layer 1, increasing the structural strength of the composite material wound pipe 100.

In other examples, a plurality of fastening portions 32 are arranged offset on the first structural layer 1. Here, the plurality of fixing portions 32 are provided at intervals on the first structural layer 1, and are mainly used to increase the structural strength of the composite material winding pipe 100 and to generate a stable mechanical anchor at the interface between the composite material winding pipe 100 and the concrete, thereby greatly improving the interface performance.

In some embodiments of the invention, the shear key 3 is at least one of a steel shear key, an FRP (Fiber Reinforced composite) shear key, or a plastic shear key. The above structure can increase the structural strength of the shear key 3, so that the shear key 3 can generate stable mechanical anchoring between interfaces.

Optionally, the shear key 3 is a steel shear key, and the steel shear key is manufactured by adopting a welding process. The steel shear key has the advantages of high strength, good toughness, simple and convenient manufacture and the like, and the steel shear key is arranged on the composite material winding pipe 100, so that the structural strength of the composite material winding pipe 100 can be improved.

In other examples, the shear key 3 is an FRP shear key, and the FRP shear key is manufactured by a vacuum infusion process. The FRP shear key has the advantages of high tensile strength, strong corrosion resistance and the like, so that the service life of the shear key 3 is prolonged, and the service life of the composite material-concrete combined member is further prolonged.

In other examples, the shear key 3 is a plastic shear key, and the plastic shear key is manufactured by an injection molding process. The plastic shear key has the advantages of strong corrosion resistance, low cost and the like, and the production cost of the composite material winding pipe 100 can be saved.

Alternatively, when the shear key 3 is made of a steel shear key, the fixing portion 32 may be connected to the mating portion 31 by welding, so as to increase the connection strength between the fixing portion 32 and the mating portion 31, so that the assembled shear key 3 is structurally stable.

Of course, in other examples, the shear key 3 may be formed by an integral molding process. The integral forming process can ensure that the matching part 31 and the fixing part 32 do not need to be subjected to machining such as welding, polishing and grinding in the early stage in the assembly process of the shear key 3, the assembly process is effectively simplified, and the production efficiency of the shear key 3 is improved.

In some embodiments of the present invention, the first structural layer 1 and the second structural layer 2 comprise at least one inorganic fiber winding layer and/or at least one organic fiber winding layer. Here, the first structural layer 1 and the second structural layer 2 each comprise at least one inorganic fiber winding layer and at least one organic fiber winding layer; or, the first structural layer 1 and the second structural layer 2 comprise at least one wound layer of inorganic fibers; alternatively, the first and second

structural layers

1, 2 comprise at least one organic fiber wound layer.

That is, the first structural layer 1 and the second structural layer 2 may be one of an inorganic fiber winding layer and an organic fiber winding layer, and the first structural layer 1 and the second structural layer 2 may also be a combination of an inorganic fiber winding layer and an organic fiber winding layer. When the first structural layer 1 and the second structural layer 2 adopt organic fiber winding layers, the organic fiber winding layers can be flax fiber winding layers or aramid fiber winding layers; when the first structural layer 1 and the second structural layer 2 adopt the inorganic fiber winding layer, the inorganic fiber winding layer can be a glass fiber winding layer, a carbon fiber winding layer or a basalt fiber winding layer. The specific materials of the first structural layer 1 and the second structural layer 2 are not particularly limited, and the skilled person may select them according to the actual engineering requirements.

Optionally, the composite lay-up tube 100 further comprises at least one resin layer (not shown) attached to the second structural layer 2. In the process of curing the subsequent composite material winding pipe 100, the resin layer can bond the first structural layer 1 and the second structural layer 2 together to form the composite material winding pipe 100, so that the integrity of the composite material winding pipe 100 is good and the structural stability of the composite material winding pipe 100 is improved.

An inflatable mandrel 200 according to an embodiment of the present invention is described below with reference to the drawings of the specification.

According to an embodiment of the present invention, an inflatable core mold 200, the inflatable core mold 200 being mountable on a winding machine (not shown in the drawings), as shown in fig. 4, includes: an air bag 210.

As shown in fig. 4, an inflatable/deflatable valve 2101 is disposed on the balloon 210, an inflation cavity is formed inside the balloon 210, a fixing groove 2102 is formed by recessing the surface of the balloon 210 in the direction of the inflation cavity, and the fixing portion 32 in the composite material winding pipe 100 can be positioned in the fixing groove 2102.

As can be seen from the above structure, in the inflatable core mold 200 according to the embodiment of the present invention, by providing the air gate 2101 on the air bag 210, when the inflatable core mold 200 is needed, the air bag 210 can be inflated through the air gate 2101, and then continuous long fibers are wound on the inflatable core mold 200 to form the uncured composite material winding tube 100; when the uncured composite wrap tube 100 is to be removed from the inflation mandrel 200 after high temperature curing, the bladder 210 can be deflated through the air port 2101 to facilitate removal of the inflation mandrel 200 from the first structural layer 1 and mating portion 31.

By arranging the concave fixing groove 2102 on the surface of the airbag 210, in the process of producing the composite material winding pipe 100, the fixing groove 2102 is used for positioning the fixing portion 32 in the composite material winding pipe 100 to limit the position of the shear key 3, so that the position of the shear key 3 is stable in the process of producing the composite material winding pipe 100, the fixing groove 2102 can also play a role of avoiding the shear key 3, the other end of the fixing portion 32 can be ensured to smoothly extend out from the first structural layer 1 in the process of extending out from the second structural layer 2 in the direction away from the second structural layer, namely, the shear key 3 can be conveniently formed in the composite material winding pipe 100 in the process of producing the composite material winding pipe 100, and when the composite material winding pipe 100 is combined with concrete to form a composite material-concrete combined member, the interface slippage phenomenon cannot occur.

It will be appreciated that the inflatable mandrel 200 of the present application, in contrast to the prior art, has recessed retaining grooves 2102 formed in the surface of the bladder 210, and the retaining grooves 2102 are used to position and avoid the retaining portions 32 in the composite winding tube 100, so as to facilitate the formation of the shear keys 3 on the composite winding tube 100 that protrude towards the inside of the composite winding tube 100.

In a specific example, the airbag 210 has a cylindrical shape, fixing grooves 2102 are uniformly distributed on the outer surface of the cylindrical shape, and the fixing grooves 2102 are recessed towards the inside of the airbag 210 for installing the shear key 3.

Alternatively, the bladder 210 may be made of a material having a high deformability, such as rubber. So that the airbag 210 has the ability to deform under the action of the gas.

Alternatively, the gas filled in the airbag 210 may be nitrogen. The nitrogen has stable performance, does not react or decompose at high temperature, has no potential safety hazard problems of flammability, explosiveness and the like, and improves the safety of the inflatable core mold 200.

It should be noted that the air port 2101 has to have good sealing performance to facilitate the transportation and discharge of the gas, and when the gas is transported in the inflation cavity and the airbag 210 does not need to be deflated, the air port 2101 further ensures that the gas in the inflation cavity is not discharged from the air port 2101. The specific structure and material of the valve 2101 are not specifically limited herein, and the skilled person may select the valve according to the actual engineering requirements.

Optionally, as shown in figure 4, the inflatable plug 200 further includes a securing post 220. The fixing posts 220 are disposed on opposite sides of the airbag 210, and the fixing posts 220 are mainly used to connect the inflatable core mold 200 to a winding machine, so as to ensure that the winding machine can drive the inflatable core mold 200 to rotate during operation, thereby preparing for subsequent winding of the first structural layer 1 and the second structural layer 2.

Alternatively, the fixing post 220 may be a steel bearing. The steel bearing itself has sufficient stiffness and strength for connection to a winding machine.

Alternatively, the fixing grooves 2102 may include a plurality of fixing grooves 2102, the number of the fixing grooves 2102 corresponding to the number of the shear keys 3, and each fixing groove 2102 may position the fixing portion 32 in one composite material winding pipe 100.

A method of manufacturing the composite material wound pipe 100 according to the embodiment of the present invention will be described with reference to the drawings.

According to the method for processing the composite material winding pipe 100 of the embodiment of the present invention, the inflatable core mold 200 is adopted, the inflatable core mold 200 is the inflatable core mold 200, and the structure of the inflatable core mold 200 is not described herein again. As shown in fig. 5, the method of processing the composite material wound pipe 100 includes the steps of:

in step S1, the inflatable core mold 200 is inflated by using the inflatable core mold 200, and the inflatable core mold 200 is fixedly attached to the winding machine.

Step S2 is to wind the continuous filament onto the inflatable mandrel 200 by wet hoop winding to form an uncured first structural layer 1 (see fig. 6).

Step S3 is to place a plurality of shear keys 3 (refer to fig. 7) at intervals on the outer peripheral surface of the uncured first structural layer 1, and to locate the fitting portions 31 on the outer peripheral surface of the uncured first structural layer 1, with one ends of the fixing portions 32 fitted in the fixing grooves 2102.

Step S4, winding the continuous filament on the mating portion 31 and the outer peripheral surface of the uncured first structural layer 1 by using a wet hoop winding method to form an uncured second structural layer 2 (refer to fig. 8), and positioning the mating portion 31 between the uncured first structural layer 1 and the second structural layer 2.

Step S5 is to remove the inflated core mold 200 from the winding machine.

And step S6, carrying out high-temperature curing on the uncured first structural layer 1 and the uncured second structural layer 2.

Step S7 is to exhaust the inflatable core mold 200, and the inflatable core mold 200 is detached from the first structural layer 1 and the mating portion 31, and the cured first structural layer 1, the cured second structural layer 2, and the shear key 3 form the composite material winding pipe 100.

As can be seen from the above processing method, in the processing method of the composite material winding pipe 100 according to the embodiment of the present invention, before the composite material winding pipe 100 is produced, the inflatable core mold 200 is inflated through the air valve 2101 on the inflatable core mold 200 to prepare for the subsequent winding of the first structural layer 1 and the second structural layer 2, after the inflation of the inflatable core mold 200 is completed, the inflatable core mold 200 is fixedly mounted on the winding machine through the fixing post 220 on the inflatable core mold 200 to ensure that the winding machine can drive the inflatable core mold 200 to rotate during the operation, during the rotation of the inflatable core mold 200, continuous long fibers are wound on the inflatable core mold 200 by the wet hoop winding method to form the uncured first structural layer 1, the structural schematic diagram of the first structural layer 1 and the inflatable core mold 200 after the winding is completed can be seen in fig. 6, and then, a plurality of shear keys 3 are spaced apart on the outer circumferential surface of the uncured first structural layer 1, and the fixing portions 32 of the shear keys 3 are fitted in the fixing grooves 2102 on the surface of the airbag 210 The schematic structural diagram after the shear key 3 is fixed can be seen in fig. 7, after the shear key 3 is fixed, a layer of continuous filament is wound on the matching part 31 and the outer peripheral surface of the uncured first structural layer 1 to form an uncured second structural layer 2, the specific structural diagram of the wound second structural layer 2 can be seen in fig. 8, the first structural layer 1 and the second structural layer 2 are matched to define the position of the shear key 3, so that the position of the shear key 3 relative to the composite material winding pipe 100 is stable, after the second structural layer 2 is wound, the inflatable core mold 200 is taken down from the winding machine and the first structural layer 1 and the second structural layer 2 are cured at high temperature, after the curing at high temperature is finished, the inflatable core mold 200 is exhausted through the air valve 2101 on the inflatable core mold 200, at this time, the fixing part 32 on the shear key 3 can be separated from the fixing groove 2102, and the cured first structural layer 1, the uncured second structural layer, The cured second structural layer 2 and shear keys 3 can be released from the inflated mandrel 200 and form a wound composite pipe 100. The processing method of the composite material winding pipe 100 is matched with the inflatable core mold 200 to form the composite material winding pipe 100 with the shear key 3, so that the phenomenon of interface slippage can be avoided when the composite material winding pipe 100 is combined with concrete for use, and the structural strength and the mechanical property of a composite material-concrete combined member are improved.

It should be emphasized that the first structural layer 1 and the second structural layer 2 are cured after the shear key 3 is assembled, so as to ensure that the shear key 3 does not damage the composite material winding pipe 100 in the assembling process, and the shear key is tightly combined with the composite material winding pipe 100, thereby increasing the structural strength of the composite material winding pipe 100.

It can be understood that, compared with the prior art, the composite material wound pipe 100 of the present application embeds part of the shear key 3 between the first structural layer 1 and the second structural layer 2 of the composite material wound pipe 100 from the internal structure, and the embedding stage is before the composite material wound pipe 100 is cured, so that the embedding of the shear key 3 is more compact; from the aspect of mechanical properties, the composite material winding pipe 100 with the built-in shear key 3 still has the advantages of corrosion resistance, high hoop tensile strength and the like which are the same as those of the traditional composite material winding pipe, and meanwhile, the composite material winding pipe 100 with the built-in shear key 3 can form stronger and more reliable interface connection with concrete when being used in combination with the concrete, so that the integrity and the mechanical properties of the composite material-concrete combined member are greatly improved.

The wet hoop winding method is a method in which continuous long fibers are wetted and then wound directly around the inflatable core mold 200 under tension control. Compared with the dry winding, the cost of the wet winding is 40% lower than that of the dry winding, and the redundant resin glue solution extrudes bubbles due to the winding tension and fills gaps, so that the product wound by the wet winding has good air tightness, and the resin glue solution on the continuous long fibers can reduce the abrasion of the continuous long fibers in the wet winding process; after the wet winding is finished, the resin glue solution on the continuous long fiber can enable the first structural layer 1 and the second structural layer 2 to form an integral structure under the high-temperature curing.

The specific structure of the composite material winding tube 100 and the inflated core mold 200 in the specific embodiment of the present invention will be described with reference to the drawings attached to the specification. The embodiments of the present invention may be all embodiments obtained by combining the foregoing technical solutions, and are not limited to the following specific embodiments, which fall within the scope of the present invention.

Example 1

A composite wound pipe 100, as shown in fig. 1, comprising: the structural member comprises a first structural layer 1, a second structural layer 2 and a shear key 3.

As shown in fig. 1, the second structural layer 2 is connected to the outside of the first structural layer 1.

As shown in fig. 1 and 2, the shear key 3 includes a fitting portion 31 and a fixing portion 32, the fitting portion 31 is connected between the first structural layer 1 and the second structural layer 2, one end of the fixing portion 32 is connected to the fitting portion 31, and the other end of the fixing portion 32 extends from the first structural layer 1 toward a direction away from the second structural layer 2.

Example 2

A wound composite material pipe 100, which is different from embodiment 1 in that, as shown in fig. 1, the wound composite material pipe 100 is a cylindrical pipe comprising: the structural member comprises a first structural layer 1, a second structural layer 2 and a shear key 3.

As shown in fig. 1 and 2, the shear key 3 includes a plurality of shear keys 3, the plurality of shear keys 3 are arranged on the first structural layer 1 at intervals, the shear key 3 includes a fitting portion 31 and a fixing portion 32, the fitting portion 31 is a thin sheet with curvature, and the fitting portion 31 is connected between the first structural layer 1 and the second structural layer 2; the fixing portion 32 is rod-shaped, one end of the fixing portion 32 is connected with the matching portion 31, the other end of the fixing portion 32 extends out of the first structural layer 1 in the direction away from the second structural layer 2, two opposite side surfaces of the matching portion 31 are respectively attached to the first structural layer 1 and the second structural layer 2, and the plurality of fixing portions 32 are arranged on the first structural layer 1 in a matrix form.

Example 3

An inflatable mandrel 200, as shown in figure 4, comprising: an air bag 210 and a fixing post 220.

As shown in fig. 4, the fixing posts 220 are disposed on opposite sides of the air bag 210, the air bag 210 is provided with an inflatable/deflatable valve 2101, the air bag 210 is cylindrical as a whole and has an inflatable chamber formed therein, the surface of the air bag 210 is recessed toward the inflatable chamber to form a plurality of fixing slots 2102, and the fixing portions 32 in the composite material winding pipe 100 of embodiment 2 can be positioned in the fixing slots 2102.

Example 4

A method for processing the winding pipe 100 of the composite material in example 2 by using the inflatable core mold 200 in example 3, comprising the following steps:

in step S1, the inflatable core mold 200 is inflated, and the inflatable core mold 200 is fixedly mounted on the winding machine.

Step S5 is to remove the inflated core mold 200 from the winding machine.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; either mechanically or electrically. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Other constructions of the composite winding tube 100, the inflatable mandrel 200, and the method of manufacturing the composite winding tube 100 according to the embodiments of the present invention, such as the structure and the operation principle of the winding machine, are known to those skilled in the art and will not be described in detail herein.

In the description herein, references to the description of the terms "embodiment," "example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A composite wound pipe, comprising:

a first structural layer;

the second structural layer is connected outside the first structural layer;

the shear key comprises a matching part and a fixing part, the matching part is connected between the first structural layer and the second structural layer, one end of the fixing part is connected with the matching part, and the other end of the fixing part faces away from the second structural layer and extends out of the first structural layer.

2. The wound composite material pipe of claim 1, wherein the mating portion is a sheet structure that is mated between the first structural layer and the second structural layer.

3. The wound composite material pipe of claim 2, wherein the wound composite material pipe is a cylindrical pipe, the fitting portion is a thin sheet with curvature, and two opposite sides of the fitting portion are respectively attached to the first structural layer and the second structural layer.

4. The wound composite material pipe of claim 3, wherein the length of the anchoring portion extending beyond the first structural layer is less than the radius of the wound composite material pipe, and the end of the anchoring portion distal from the mating portion forms an anchoring end.

5. The wound composite tube of claim 1, wherein the anchoring portion is rod-shaped or sheet-shaped.

6. The wound composite material pipe of any one of claims 1-5, wherein the shear key comprises a plurality of shear keys arranged in spaced relation on the first structural layer; the plurality of matching parts of at least part of the shear key are arranged at intervals along the length direction of the first structural layer.

7. The wound composite material pipe according to claim 6, wherein a plurality of the anchoring portions are arranged in a matrix form on the first structural layer; or a plurality of fixing parts are arranged on the first structural layer in a staggered mode.

8. The wound composite pipe of any one of claims 1-5, wherein the shear key is at least one of a steel, FRP, or plastic shear key.

9. The wound composite material pipe according to any one of claims 1 to 5, wherein the first structural layer and the second structural layer comprise at least one wound layer of inorganic fibers and/or at least one wound layer of organic fibers.

10. The wound composite pipe of claim 9, further comprising at least one resin layer attached to the second structural layer.

11. An inflatable mandrel mountable on a winding machine, comprising:

an air bag, wherein an inflatable and deflatable valve is arranged on the air bag, an inflatable cavity is formed inside the air bag, the surface of the air bag is concave towards the direction of the inflatable cavity to form a fixing groove, and the fixing part in the composite material winding pipe according to any one of claims 1-10 can be positioned in the fixing groove.

12. A processing method of a composite material winding pipe is characterized by comprising the following steps:

s1, inflating the inflated core mold with the inflated core mold of claim 11, the inflated core mold being fixedly mounted on a winding machine;

s2, winding continuous long fibers on the inflatable core mold by adopting a wet circumferential winding method to form the uncured first structural layer;

s3, placing a plurality of shear keys on the outer peripheral surface of the uncured first structural layer at intervals, and positioning the fitting portions on the outer peripheral surface of the uncured first structural layer, wherein one end of the fixing portion is fitted in the fixing groove;

s4, winding continuous long fibers on the matching part and the outer peripheral surface of the uncured first structural layer by adopting a wet circumferential winding method to form an uncured second structural layer, and enabling the matching part to be located between the uncured first structural layer and the uncured second structural layer;

s5, removing the inflatable core mould from the winding machine;

s6, performing high-temperature curing on the uncured first structural layer and the uncured second structural layer;

and S7, exhausting the inflatable core mold, separating the inflatable core mold from the first structural layer and the matching part, and forming the composite material winding pipe by the cured first structural layer, the cured second structural layer and the shear keys.