CN113623467B - A kind of directionally reinforced pipe and preparation method thereof - Google Patents

Abstract

The invention discloses a directionally reinforced pipe and a preparation method thereof, wherein the pipe comprises an inner pipe part, an outer pipe part and a transition connecting pipe part which are sleeved with each other, and the transition connecting pipe part is used for connecting the outer wall of the inner pipe part and the inner wall of the outer pipe part so as to reinforce the pipe in a set direction. Compared with the traditional isotropic pipe, the transitional connecting pipe part is arranged between the inner pipe part and the outer pipe part of the pipe provided by the invention, and the pipe can be reinforced in the set direction, so that the strength and rigidity of the pipe in the set direction can be higher than those in other directions, therefore, when the pipe is used in an occasion with higher strength and rigidity requirements in a single direction (main bearing direction), the waste of the strength and rigidity of the pipe in a non-main bearing direction can be avoided, and the light weight level of the product can be improved to a greater extent, so that the current light weight development requirement can be met.

Description

A kind of directionally strengthened pipe and its preparation method

technical field

The invention relates to the technical field of pipe preparation, in particular to a directionally reinforced pipe and a preparation method thereof.

Background technique

At present, the radial properties of conventional pipes are mostly isotropic, that is, the pipes have the same or basically the same rigidity and strength in the circumferential direction. However, in some specific occasions, the pipes are often required to be in a certain radial ( The main bearing direction) has high stiffness and strength. At this time, if an isotropic pipe is used, it will inevitably lead to waste of stiffness and strength in the non-main bearing direction, and it is also not conducive to the lightweight design of the product.

Therefore, how to provide a solution to overcome the above defects is still a technical problem to be solved urgently by those skilled in the art.

Contents of the invention

The object of the present invention is to provide a directionally reinforced pipe and its preparation method, wherein the pipe can be reinforced in a set direction, so as to avoid the waste of strength and stiffness of the pipe in the non-main bearing direction, and facilitate the light weight of the product. Quantitative design.

In order to solve the above-mentioned technical problems, the present invention provides a directionally reinforced pipe, which includes a socketed inner pipe part, an outer pipe part and a transitional connection pipe part, and the transitional connection pipe part is used to connect the outer wall of the inner pipe part and the inner wall of the outer pipe part, so as to strengthen the pipe material in a set direction.

Compared with the traditional isotropic pipe, the pipe provided by the present invention is provided with a transition connecting pipe between the inner pipe and the outer pipe, which can strengthen the pipe in the set direction, so that the pipe can be in the set direction The strength and stiffness of the pipe can be greater than that of other directions. In this way, when used in occasions where the strength and stiffness of the single direction (the main bearing direction) are large, the waste of the strength and stiffness of the pipe in the non-main bearing direction can be avoided, and it can be used to a greater extent. Improve the lightweight level of products to meet the current development needs of lightweight.

Optionally, the transition connecting pipe part includes an elliptical pipe, and the elliptical pipe is overlaid on the inner pipe part; The outer walls at both ends of the shaft are connected to the outer tube; or, the inner wall at one end of the long axis of the oval tube is connected to the inner tube, and the outer wall at the other end of the long axis is connected to the outer tube.

Optionally, the transition connecting pipe part includes more than two oval pipes, each of the oval pipes is socketed with each other, and the innermost oval pipe is overlaid on the inner pipe part, and the transition connecting pipe part The inner wall of the innermost oval tube is connected to the inner tube part, and the outer wall of the outermost oval tube is connected to the outer tube part, and two adjacent layers of the oval tubes are connected.

Optionally, the major axes of each of the elliptical tubes are arranged in the same direction, the innermost elliptical tube is connected to the inner tube part by the inner wall at both ends of the minor axis, and the outermost elliptical tube is connected by its long The outer walls at both ends of the axis are connected to the outer tube; among the two adjacent layers of elliptical tubes, the inner walls at both ends of the short axis of the elliptical tube located in the outer layer are at the two ends of the short axis of the elliptical tube located in the inner layer. The outer wall of the end is connected.

Optionally, the major axes of each of the elliptical tubes are arranged in the same direction, the innermost elliptical tube is connected to the inner tube part by the inner wall of one end of its major axis, and the outermost elliptical tube is connected by its long The outer wall at one end of the shaft is connected with the outer tube part, and the oval tubes of two adjacent layers are connected with the long axis end.

Optionally, the major axes of the two adjacent layers of elliptical tubes are perpendicular to each other, the innermost layer of the elliptical tubes is connected to the inner tube with the inner walls at both ends of the short axis, and the outermost layer of the elliptical tubes is The outer walls at both ends of its major axis are connected to the outer tube; among the two adjacent layers of oval tubes, the inner wall at both ends of the short axis of the oval tube in the outer layer is the same as the length of the oval tube in the inner layer. The outer walls at both ends of the shaft are connected.

Optionally, the transition connecting pipe part includes a transition pipe and more than two elliptical pipes, each of the elliptical pipes is socketed with each other, and the innermost elliptical pipe is connected to the inner pipe by the inner wall at both ends of its minor axis. The outermost layer of the oval tube is connected to the outer tube portion with the outer walls at both ends of its long axis, and the two adjacent layers of oval tubes are connected through the transition tube.

Optionally, the gap between the inner pipe part and the transition connection pipe part and/or the gap between the outer pipe part and the transition connection pipe part and/or the gap in the transition connection pipe part Filling material is provided.

The present invention also provides a method for processing a directionally reinforced pipe, which is suitable for the above-mentioned directionally reinforced pipe. The processing method includes: step S1, configuring an inner mold; step S2, using prepreg to wrap around the inner mold to Forming the inner pipe part; step S3, disposing a transition mold on the outside of the inner pipe part according to the cross-sectional shape of the transition connection pipe part, and using the prepreg to wrap around the transition mold to form the transition Connecting pipe part; step S4, configuring an outer mold on the outside of the transition connecting pipe part; step S5, using prepreg to wrap around the outer mold to form the outer pipe part; wherein, the transition connecting pipe part includes In the case of multiple socketed pipes, the transition mold includes a plurality of split molds, each of which is divided into multiple configurations, and the prepreg is wound around each of the split molds in turn to form the transition connection pipe part Each of the said divisions.

Optionally, in the step S2, the step S3 and the step S5, the prepreg is wound in a non-disconnected manner.

Description of drawings

Fig. 1 is the cross-sectional view of the first embodiment of the directional reinforced pipe provided by the present invention;

Fig. 2 is the cross-sectional view of the second specific embodiment of the directionally reinforced pipe material provided by the present invention;

Fig. 3 is a cross-sectional view of a third specific embodiment of the directionally reinforced pipe material provided by the present invention;

Fig. 4 is a cross-sectional view of a fourth specific embodiment of the directionally reinforced pipe provided by the present invention;

Fig. 5 is a cross-sectional view of a fifth embodiment of the directional reinforced pipe provided by the present invention;

Fig. 6 is a cross-sectional view of the sixth specific embodiment of the directionally reinforced pipe provided by the present invention;

Fig. 7 is a cross-sectional view of the seventh specific embodiment of the directionally reinforced pipe provided by the present invention;

Fig. 8 is a cross-sectional view of the eighth specific embodiment of the directionally reinforced pipe provided by the present invention;

Fig. 9 is a flowchart of a method for preparing a directionally reinforced pipe provided by the present invention.

The reference numerals in Fig. 1-Fig. 9 are explained as follows:

1 inner tube;

2 outer tube;

3 Transition connecting pipe, 31 oval pipe, 32 transition pipe;

A internal mold, B transition mold, B1 split mold, C external mold.

Detailed ways

In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Embodiment one

Please refer to Figures 1-8, Figure 1 is a cross-sectional view of the first specific embodiment of the directional reinforced pipe provided by the present invention, and Figure 2 is a cross-sectional view of the second specific embodiment of the directional reinforced pipe provided by the present invention Fig. 3 is a cross-sectional view of the third specific embodiment of the directional reinforced pipe provided by the present invention, and Fig. 4 is a cross-sectional view of the fourth specific embodiment of the directional reinforced pipe provided by the present invention, and Fig. 5 is the present invention The sectional view of the fifth embodiment of the directional reinforced pipe provided by the invention, Figure 6 is the sectional view of the sixth specific embodiment of the directional reinforced pipe provided by the present invention, and Figure 7 is the directional reinforced pipe provided by the present invention The cross-sectional view of the seventh specific embodiment of the pipe material, Fig. 8 is the cross-sectional view of the eighth specific embodiment of the directionally reinforced pipe material provided by the present invention.

As shown in Figures 1 to 8, the present invention provides a directional reinforced pipe, including a socketed inner pipe part 1, an outer pipe part 2 and a transitional connection pipe part 3, the transitional connection pipe part 3 is used to connect the inner pipe The outer wall of part 1 and the inner wall of outer tube part 2 to reinforce the pipe in the set direction.

Compared with the traditional isotropic pipe, the pipe provided by the present invention is provided with a transition connecting pipe part 3 between the inner pipe part 1 and the outer pipe part 2, which can strengthen the pipe in the set direction, so that the pipe is The strength and stiffness of the set direction can be greater than that of other directions. In this way, when used in occasions where the strength and stiffness of the single direction (the main bearing direction) are required to be large, the waste of the strength and stiffness of the pipe in the non-main bearing direction can be avoided. Moreover, it can be Increase the lightweight level of products to a greater extent to meet the current development needs of lightweight.

Here, the embodiment of the present invention does not limit the specific occasions where the above-mentioned unidirectional strength and rigidity requirements are large. In other words, the embodiment of the present invention does not limit the application scenarios of the above-mentioned pipes; For the main girder of a man-machine wing, its bending resistance requirements in the direction perpendicular to the airfoil are higher than those along the heading direction. For this application scenario, the directional reinforced pipe provided by the present invention can be very good It meets the requirements of its bending resistance in the direction perpendicular to the airfoil, and can also greatly reduce the weight of the main beam to meet the lightweight design requirements, which is of positive significance for reducing loads and extending battery life.

In addition, the above-mentioned setting direction may be a single direction or multiple directions. The direction to be strengthened should be determined in combination with the actual application scenario.

The following embodiments of the present invention will describe the structure of the directional reinforced pipe provided by the present invention in conjunction with several specific implementation methods, wherein the reinforced position of the pipe can refer to the pipe wall pointed by the arrow in the drawings.

As shown in Figure 1, the transitional connecting pipe portion 3 may only include an elliptical pipe 31, the elliptical pipe 31 may be placed outside the inner pipe portion 1, the inner wall of the oval pipe 31 may be connected to the inner pipe portion 1 at both ends of its minor axis, and The outer walls at both ends of the long axis are connected to the outer pipe part 2 , at this time, the pipe wall where the long axis direction of the oval pipe 31 is located can be reinforced.

In conjunction with Fig. 2 again, Fig. 2 is the deformation scheme of Fig. 1, and the inner wall of one end of the oval tube 31 can be connected to the inner pipe part 1, and the outer wall at the other end of its long axis is connected to the outer pipe part 2. At this time, The pipe wall on one side of the pipe can be reinforced.

Except the scheme that there is only one elliptical tube 31, the transitional connection pipe part 3 can also adopt the scheme that includes more than two elliptical tubes 31. Covered in the inner tube part 1, the transition connecting tube part 3 can be connected to the inner tube part 1 by the inner wall of the innermost oval tube 31, and can be connected to the outer tube part 2 by the outer wall of the outermost oval tube 31, and adjacent Two layers of oval tubes 31 can be connected. Compared with the solution of one elliptical tube 31, the solution of multiple elliptical tubes 31 is more suitable for the situation where the tube wall is relatively thick. Since the tube wall is thicker, the gradual superposition of multiple elliptical tubes 31 with gradually increasing sizes can Improve the local anti-destabilization performance of the pipe, and at the same time, ensure the strengthening effect on the pipe.

In one embodiment, as shown in Figure 3, the major axes of the oval tubes 31 can be arranged in the same direction, the innermost oval tube 31 can be connected to the inner tube part 1 with the inner wall at both ends of the minor axis, and the outermost The outer wall of the oval tube 31 can be connected to the outer tube portion 2 at both ends of its major axis; The outer walls at the two ends of the short axis are connected. At this time, the reinforcing position of the pipe is still the two side walls where the long axis direction of the oval tube 31 is located.

In another embodiment, the long axes of the oval tubes 31 can still be arranged in the same direction, the innermost oval tube 31 is connected to the inner tube part 1 with the inner wall at one end of the long axis, and the outermost oval tube 31 is The outer wall at one end of the long axis is connected to the outer tube part 2, and the two adjacent oval tubes 31 can be connected at the end of the long axis.

This kind of embodiment can comprise following two situations again: one, as shown in Figure 4, each oval tube 31 is all connected with the same end (lower end in the accompanying drawing) of major axis, and with this end and inner tube part 1 The other end (upper end in the accompanying drawings) of the long axis of each oval tube 31 is not connected to each other, and the outer wall of the other end (upper end in the accompanying drawing) of the long axis of the outermost oval tube 31 can be connected with The outer tube portion 2 is connected; second, the two ends of the long axis of the elliptical tube 31 can be connected to the inner and outer tubes or the tube portion respectively, taking the scheme of two elliptical tubes 31 shown in Fig. 5 as an example, the innermost The layer oval tube 31 can be connected to the inner tube part 1 with its long axis lower end, and be connected with the long axis upper end of the outermost layer oval tube 31 with its long axis upper end, and the outermost layer oval tube 31 can be connected with the outer tube part at its long axis lower end. 2 connected.

In yet another embodiment, the major axes of adjacent two layers of oval tubes 31 can be perpendicular to each other, the innermost oval tube 31 can be connected to the inner tube part 1 with the inner wall at both ends of the short axis, and the outermost oval tube 31 The outer walls at both ends of its long axis can be connected to the outer tube portion 2; in the two adjacent layers of elliptical tubes 31, the inner wall at both ends of the short axis of the elliptical tube 31 at the outer layer can be connected with the two ends of the long axis of the elliptical tube 31 at the inner layer. The outer walls are connected. With this embodiment, the main reinforcement positions of the pipe material are the two side walls where the long axis direction of the outermost oval pipe 31 is located.

Further, as shown in Fig. 7 and Fig. 8, the transition connecting pipe part 3 can also include a transition pipe 32 and more than two oval pipes 31, each oval pipe 31 can be nested with each other, and the innermost oval pipe 31 can be connected with The inner tube part 1 is connected, the outermost oval tube 31 can be connected with the outer tube part 2, and the above-mentioned transition tube 32 can be provided between the adjacent two layers of oval tubes 31, and the adjacent two layers of oval tubes 31 are all connected to the two layers. The transition pipe 32 between them is connected. With this structure, through the setting of the transition pipe 32, it is actually equivalent to a layered design of the pipe wall between the inner pipe part 1 and the outer pipe part 2, and then, between the transition pipe 32 and the inner pipe part 1 And the layering between the transition pipe 32 and the outer pipe portion 2 (if there are a plurality of transition pipes 32 that are nested, the layering here can also include the space between two adjacent transition pipes 32) and oval pipes are respectively arranged. 31, this scheme is more suitable for the situation of thicker pipe wall, which is beneficial to improve the local anti-destabilization performance of the pipe.

In the above-mentioned solution including the transition tube 32, the connection structure between the oval tube 31 and the transition tube 32, the inner tube part 1, and the outer tube part 2 can be designed with reference to the description that only the part of the oval tube 31 exists, and will not be repeated here. sexual description.

It should be pointed out that the above-mentioned description about the structural form of the transition connection pipe part 3 is only an exemplary description of the embodiment of the present invention, and cannot be used as a limitation of the implementation scope of the directional reinforced pipe provided by the present invention. In practical applications , the structural form of the transitional connection pipe part 3 can be varied, as long as there is a connection between each pipe of the transitional connection pipe part 3 (if a plurality of pipes are included), and the transitional connection pipe part 3 is also connected to the inner pipe part 1 and It is enough that there is a connection between the outer pipe parts 2 and the strength and rigidity of the set direction of the pipe can be strengthened.

In addition, the embodiment of the present invention does not limit the cross-sectional shapes of the inner pipe part 1, the outer pipe part 2 and the transition pipe 32. In the scheme of the drawings, the cross-sectional shapes of the inner pipe part 1, the outer pipe part 2 and the transition pipe 32 are A circle, in fact, can also be a square or other shapes; in the above-mentioned solutions, the oval tube 31, which is the core part of the transitional connection tube part 3, is actually only a specific example that can produce a directional reinforcement effect , in addition, other reinforced tube structures similar to the structure of the oval tube 31 can also be used, such as tubes with a waist-shaped cross-sectional shape, a bar shape, a drum shape, and the like.

Further, the gap between the inner tube part 1 and the transition connecting tube part 3 and/or the gap between the outer tube part 2 and the transition connecting tube part 3 and/or the gap in the transition connecting tube part 3 (the transition connecting tube part The gaps in 3 are generated when there are multiple pipes) can be provided with filling materials, the filling materials can be specifically rigid foam, 3D printing space grids, etc., to fill the above-mentioned gaps, and then improve the durability of the pipes. Local instability performance.

The above-mentioned directional reinforced pipes can be wound and molded at one time through the prepreg in a non-disconnected manner, so that the formed pipes have a higher degree of integration, which can reduce the number of parts in the structural system, greatly shorten the manufacturing cycle, and reduce the production cost. cost.

Embodiment two

Please refer to FIG. 9 . FIG. 9 is a flowchart of a method for preparing a directionally reinforced pipe provided by the present invention.

As shown in Figure 9, the present invention also provides a method for processing a directionally reinforced pipe, which is suitable for the directionally reinforced pipe involved in the various implementations in Example 1. The processing method includes:

Step S1, configuring the internal model A;

The inner mold A is a detachable mold, and its outer surface can be coated with a release agent. The cross-sectional shape of the inner mold A can be set according to the cross-sectional shape requirements of the inner pipe part 1 .

Step S2, using the prepreg to wrap around the inner mold A to form the inner tube part 1;

The above-mentioned prepreg can be a carbon fiber prepreg, and the outer side of the inner mold A can be wound with multiple layers of prepreg to form the inner tube part 1 with a set thickness. The specific value of the set thickness is not limited here. In practical applications, those skilled in the art can set according to actual needs.

Step S3, according to the cross-sectional shape of the transitional connection pipe part 3, arrange the transitional mold B on the outside of the inner pipe part 1, and use prepreg to wind around the transitional mold B to form the transitional connection pipe part 3;

The transitional mold B can be a removable mold. At this time, its outer surface can be coated with a release agent, or the transitional mold B can also be a non-removable mold. At this time, the transitional mold B can exist as a filling material.

In conjunction with Fig. 3, the transitional connection pipe part 3 may actually include a plurality of branched pipes that are nested together. At this time, each branched pipe should be formed separately. Correspondingly, the transitional mold B may also include a plurality of split molds B1. During specific production, The parting mold B1 of the inner layer can be arranged on the outside of the inner tube part 1 first, and the prepreg can be wound around the parting mold B1 of the inner layer to form the oval tube 31 of the inner layer. Then, the oval tube of the inner layer can be The outer side of 31 is configured with the outer layer parting mold B1, and the prepreg is wound around the outer layer parting mold B1 to form the outer layer oval tube 31. The thickness of each branch pipe involved in the transitional connection pipe portion 3 is also not limited here.

Step S4, configuring the outer mold C on the outside of the transitional connection pipe part 3;

Similarly, the outer mold C can be a removable mould, at this time, its outer surface can be coated with a release agent, or the outer mold C can also be a non-removable mold, at this time, the outer mold C can exist as a filling material .

In step S5 , use the prepreg to wind the outer mold C to form the outer tube part 2 , and then use resin to cure the composite material tube to obtain the final tube, and the specific curing method can be heat curing or the like.

Using this method, the directionally strengthened pipe material involved in the first embodiment can be formed. The technical effect of the directionally strengthened pipe material can refer to the first embodiment, and no repeated description is made here.

In step S2, step S3 and step S5, the prepreg can be wound in a non-disconnected manner. In this way, the directional reinforced pipe provided by the present invention is a one-time winding molding, which has a higher degree of integration and can reduce the parts of the structural system The quantity can greatly shorten the manufacturing cycle and reduce the production cost.

The above are only preferred embodiments of the present invention, and it should be pointed out that for those of ordinary skill in the art, some improvements and modifications can also be made without departing from the principle of the present invention, and these improvements and modifications should also be considered Be the protection scope of the present invention.

Claims (10)

1. A method for processing a directionally reinforced bearing pipe, wherein the bearing pipe comprises an inner pipe part (1), an outer pipe part (2) and a transition connecting pipe part (3) which are sleeved with each other, the transition connecting pipe part (3) is used for connecting the outer wall of the inner pipe part (1) and the inner wall of the outer pipe part (2) so as to reinforce the bearing pipe in a set direction, and the processing method comprises the following steps:

s1, configuring an internal mold (A);

s2, winding the inner die (A) by using a prepreg to form the inner pipe part (1);

s3, arranging a transition die (B) on the outer side of the inner pipe part (1) according to the cross-sectional shape of the transition connecting pipe part (3), and winding the prepreg around the transition die (B) to form the transition connecting pipe part (3);

s4, arranging an outer die (C) on the outer side of the transitional connecting pipe part (3);

a step S5 of winding the prepreg around the outer mold (C) to form the outer tube part (2);

when the transition connecting pipe part (3) comprises a plurality of sleeved branch pipes, the transition die (B) comprises a plurality of branch dies (B1), each branch die (B1) is configured for multiple times, and the prepreg is sequentially wound around each branch die (B1) to form each branch pipe of the transition connecting pipe part (3).

2. A method of processing a directionally reinforced load bearing tube as claimed in claim 1, wherein said prepreg is wound without being cut in each of said steps S2, S3 and S5.

3. An oriented reinforced bearing pipe, characterized in that the bearing pipe comprises an inner pipe part (1), an outer pipe part (2) and a transition connecting pipe part (3) which are sleeved with each other, the transition connecting pipe part (3) is used for connecting the outer wall of the inner pipe part (1) and the inner wall of the outer pipe part (2) so as to reinforce the bearing pipe in a set direction, and the bearing pipe is prepared by the processing method of the oriented reinforced bearing pipe according to claim 1 or 2.

4. Directionally reinforced load carrying tube according to claim 3, characterized in that said transitional coupling tube section (3) comprises an oval tube (31), said oval tube (31) being externally fitted over said inner tube section (1);

the inner walls of the two ends of the short axis of the elliptical tube (31) are connected with the inner tube part (1), and the outer walls of the two ends of the long axis of the elliptical tube are connected with the outer tube part (2); or the inner wall of one end of the long shaft of the oval tube (31) is connected with the inner tube part (1), and the outer wall of the other end of the long shaft of the oval tube is connected with the outer tube part (2).

5. Directionally reinforced load carrying tube according to claim 3, characterized in that said transitional connecting tube portion (3) comprises more than two oval tubes (31), each of said oval tubes (31) being sleeved on each other, the innermost oval tube (31) being sleeved on the inner tube portion (1), said transitional connecting tube portion (3) being connected to the inner tube portion (1) with the inner wall of the innermost oval tube (31) and to the outer tube portion (2) with the outer wall of the outermost oval tube (31), and two adjacent layers of said oval tubes (31) being connected.

6. The directionally reinforced load bearing tube as claimed in claim 5, wherein the major axes of the oval tubes (31) are oriented in the same direction, the innermost oval tube (31) is connected to the inner tube portion (1) at the inner wall at both ends of its minor axis, and the outermost oval tube (31) is connected to the outer tube portion (2) at the outer wall at both ends of its major axis;

in the two adjacent layers of the elliptical tubes (31), the elliptical tube (31) positioned at the outer layer is connected with the outer walls at the two ends of the short axis of the elliptical tube (31) positioned at the inner layer through the inner walls at the two ends of the short axis.

7. Directionally reinforced load carrying tube according to claim 5, wherein the major axes of the oval tubes (31) are arranged in the same direction, the inner wall of one end of the major axis of the oval tube (31) at the innermost layer is connected to the inner tube portion (1), the outer wall of one end of the major axis of the oval tube (31) at the outermost layer is connected to the outer tube portion (2), and the ends of the major axes of the oval tubes (31) at two adjacent layers are connected.

8. Directionally reinforced load carrying tube according to claim 5, wherein the long axes of two adjacent layers of said oval tubes (31) are perpendicular to each other, the inner wall of the oval tube (31) at the innermost layer is connected to said inner tube portion (1) at both ends of its short axis, and the outer wall of the oval tube (31) at the outermost layer is connected to said outer tube portion (2) at both ends of its long axis;

in the two adjacent layers of the elliptical tubes (31), the inner walls at the two ends of the short axis of the elliptical tube (31) positioned at the outer layer are connected with the outer walls at the two ends of the long axis of the elliptical tube (31) positioned at the inner layer.

9. The directionally reinforced load-bearing pipe as claimed in claim 3, wherein said transition connecting pipe portion (3) comprises a transition pipe (32) and more than two oval pipes (31), each oval pipe (31) is sleeved with each other, and two adjacent layers of oval pipes (31) are connected through said transition pipe (32).

10. Directionally reinforced load-bearing pipe according to any of claims 3 to 9, characterized in that the gap between the inner pipe section (1) and the transition pipe section (3) and/or the gap between the outer pipe section (2) and the transition pipe section (3) and/or the gap inside the transition pipe section (3) is provided with a filling material.

Images