阅读说明：本技术 一种管道插口、具有该插口的管道及插口制备方法 (Pipeline socket, pipeline with socket and socket manufacturing method ) 是由 叶柃 张淑娴 姜夏云 翁赟 邱乾胜 于 2019-11-29 设计创作，主要内容包括：本发明公开了一种管道插口,包括内衬层,还包括分别缠绕于所述内衬层外部的竹篾层和玻纤层；其中,所述竹篾层从最内层竹篾至最外层竹篾靠近插口的端部呈阶梯状,每层所述竹篾层端部至插口端部设有所述玻纤层,所述玻纤层的一端与所述竹篾层搭接并且呈平整对齐,另一端与插口端部平齐；所述玻纤层外部环向设有至少两个凹槽其中每个管道插口中,距离插口端部最远的凹槽为第一凹槽,距离插口端部最近的凹槽为第二凹槽。本发明还公开了一种管道及一种管道插口的制备方法。本发明的管道插口,采用阶梯状的竹篾层与玻纤层分别缠绕于内衬层并搭接而成,在全玻纤结构上切割形成凹槽,在在防止漏水的同时能够保证整体插口结构的稳定性。(The invention discloses a pipeline socket, which comprises an inner liner layer, and further comprises a bamboo skin layer and a glass fiber layer which are respectively wound outside the inner liner layer; the glass fiber layer is arranged from the end part of each bamboo skin layer to the end part of the socket, one end of the glass fiber layer is lapped with the bamboo skin layer and is in flat alignment, and the other end of the glass fiber layer is flush with the end part of the socket; the glass fiber layer is provided with at least two grooves in the circumferential direction, wherein in each pipeline socket, the groove farthest from the socket end is a first groove, and the groove closest to the socket end is a second groove. The invention also discloses a pipeline and a preparation method of the pipeline socket. The pipeline socket is formed by respectively winding the stepped bamboo skin layer and the glass fiber layer on the inner liner layer and overlapping, and grooves are formed in the full glass fiber structure in a cutting mode, so that the stability of the whole socket structure can be guaranteed while water leakage is prevented.)

1. A pipeline socket comprises an inner liner (1), and is characterized by further comprising a bamboo skin layer (2) and a glass fiber layer (3) which are respectively wound outside the inner liner (1); wherein the content of the first and second substances,

the end, close to the socket, of the bamboo skin layer (2) from the innermost layer of bamboo skin (201) to the outermost layer of bamboo skin (202) is in a step shape, the glass fiber layer (3) is arranged from the end of each layer of bamboo skin layer (2) to the end of the socket, one end of the glass fiber layer (2) is in lap joint with the bamboo skin layer (2) and is in flat alignment, and the other end of the glass fiber layer is flush with the end of the socket;

the glass fiber layer (3) is provided with at least two grooves in the circumferential direction, wherein in each pipeline socket, the groove farthest from the socket end is a first groove (5), and the groove closest to the socket end is a second groove (6).

2. The pipe socket according to claim 1, wherein the bamboo split layer (2) is stepped in a decreasing manner from the innermost bamboo split (201) to the end of the outermost bamboo split (202) near the socket.

3. The pipe socket according to claim 1, wherein the bamboo split layer (2) is in a step shape which increases from the end of the innermost bamboo split (201) to the end of the outermost bamboo split (202) close to the socket.

4. The pipe socket according to any one of claims 1 to 3, wherein the radially corresponding structure of the second groove (6) is a glass fiber layer (3), i.e. the end of the thin bamboo strip layer (2) cannot axially break through to the second groove (6).

5. The pipe socket according to claim 1 or 2, wherein a boss (4) is wound on the outer side of the glass fiber layer (3), namely on the side of the first groove (5) close to the thin bamboo strip layer (2), and the boss (4) and the glass fiber layer (3) are of an integrally formed structure.

6. The pipe socket according to claim 5, wherein the first groove (5) is located on one side of the innermost bamboo strip (201) axially close to the socket end or the end of the innermost bamboo strip (201) is radially located between the first grooves (5) or the first groove (5) is located on one side of the innermost bamboo strip (201) axially close to the boss (4).

7. A pipe socket according to claim 3, wherein the innermost end of the glass fibre layer (3) is provided with a local reinforcing end (201).

8. A pipe having a pipe socket according to any one of claims 1 to 7, wherein the pipe is female at one end and female at the other end, and the intermediate section is a pipe section.

9. A pipe having a pipe socket according to any one of claims 1 to 7, comprising a pipe structure section and a collar (7), wherein the pipe structure section has the pipe socket at both ends, and the corresponding two pipe structure sections are coaxially clamped at one end in the collar (7).

10. A method of making a pipe socket according to any one of claims 1 to 9, comprising the steps of:

s1: paving or coating a demoulding material on the cylindrical core mould;

s2: winding or bonding an inner liner (1) on the periphery of the core mold;

s3: the inner liner is characterized in that a bamboo skin layer (2) and a glass fiber layer (3) are respectively wound along the outer side of the inner liner (1), the end part, close to the socket, of the bamboo skin layer (2) from the innermost layer of bamboo skin (201) to the outermost layer of bamboo skin (202) is in a step shape, one end of the glass fiber layer (2) is in lap joint with the bamboo skin layer (2) and is aligned flatly, and the other end of the glass fiber layer is flush with the end part of the socket;

s4: when the lap joint of the glass fiber layer (3) and the outermost layer of the bamboo skin (202) is wound to the same thickness, the glass fiber layer (3) or the bamboo skin layer (2) is continuously wound to form a boss (4);

s6: heating and curing the formed pipe socket structure;

s7: and demolding and finishing the cured and molded pipeline socket structure, and forming a plurality of grooves on the periphery of the glass fiber layer (2), wherein the grooves are of circular ring structures formed along the circumferential direction.

Technical Field

The invention belongs to the technical field of pipeline connection, and particularly relates to a pipeline socket, a pipeline with the socket and a socket preparation method.

Background

The pipeline is widely applied in daily life and industrial production of people. When the pipeline is used conventionally, the pipelines with the same pipe diameter need to be connected, and the common pipeline connection modes comprise threaded connection, flange connection, welding, pipeline bell and spigot connection, cutting sleeve type connection, hot melt connection, groove connection and the like. These connections are widely used in various kinds of pipe work in many fields.

However, bamboo composite pipes are mainly made of bamboo, and due to the particularity of bamboo, the existing connection method cannot be effectively applied.

Disclosure of Invention

In view of the above-mentioned drawbacks and needs of the prior art, the present invention provides a pipe faucet that can prevent water leakage while ensuring the stability of the overall faucet structure.

In order to achieve the above object, according to one aspect of the present invention, a pipe socket is provided, which includes an inner liner, and further includes a thin bamboo strip layer and a glass fiber layer respectively wound around the outside of the inner liner; wherein the content of the first and second substances,

the bamboo skin layers are in a step shape from the innermost layer to the outermost layer, close to the end of the socket, the glass fiber layers are arranged from the end of each bamboo skin layer to the end of the socket, one end of each glass fiber layer is in lap joint with the bamboo skin layers and is in flat alignment, and the other end of each glass fiber layer is flush with the end of the socket;

the glass fiber layer is provided with at least two grooves in the circumferential direction, wherein in each pipeline socket, the groove farthest from the end part of the socket is a first groove, and the groove closest to the end part of the socket is a second groove.

Furthermore, the bamboo skin layer is in a descending ladder shape from the innermost layer to the end part of the outermost layer close to the insertion opening.

Furthermore, the bamboo skin layer is in an increasing ladder shape from the innermost layer to the end part of the outermost layer close to the insertion opening.

Further, the structures corresponding to the second groove in the radial direction are all glass fiber layers, namely, the end part of the bamboo skin layer cannot break through to the second groove in the axial direction.

Further, the fine layer outside of glass, promptly first recess is close to one side winding on thin bamboo strips used for weaving layer has the boss, the boss with fine layer of glass is the integrated into one piece structure.

Further, the first groove is located the innermost layer thin bamboo strip is close to socket tip one side in the axial direction or the tip of the innermost layer thin bamboo strip radially is located between the first groove or first groove is located the innermost layer thin bamboo strip is close to boss one side in the axial direction.

Further, the end part of the innermost layer of the glass fiber layer is provided with a local reinforcing end.

According to another aspect of the invention there is provided a pipe having said pipe socket, the pipe having a female end at one end and a female end at the other end, and a pipe section in the middle section.

According to another aspect of the present invention, there is provided a pipe having the pipe socket, comprising a pipe structure section and a bundle section, wherein the pipe structure section has the pipe socket at two ends, and the two corresponding pipe structure sections are coaxially clamped at one end in the bundle section.

According to still another aspect of the present invention, there is provided a method for manufacturing the pipe socket, including the steps of:

s1: paving or coating a demoulding material on the cylindrical core mould;

s2: winding or bonding an inner liner layer on the periphery of the core mold;

s3: respectively winding a bamboo skin layer and a glass fiber layer along the outer side of the inner liner layer, wherein the bamboo skin layer is in a step shape from the innermost layer to the outermost layer, the end part of the bamboo skin layer close to the socket, one end of the glass fiber layer is lapped with the bamboo skin layer and is aligned with the bamboo skin layer in a flat and smooth mode, and the other end of the glass fiber layer is flush with the end part of the socket;

s4: when the lap joint of the glass fiber layer and the outermost layer of the thin bamboo strip is wound to the same thickness as the lap joint, the glass fiber layer or the thin bamboo strip layer is continuously wound to form a boss;

s6: heating and curing the formed pipe socket structure;

s7: and demolding and finishing the cured and molded pipeline socket structure, and forming a plurality of grooves on the periphery of the glass fiber layer, wherein the grooves are of circular ring structures formed along the circumferential direction.

In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:

(1) the pipeline socket is formed by respectively winding the stepped thin bamboo strip layer and the glass fiber layer on the inner liner layer and overlapping the two layers, so that on one hand, the axial length of the glass fiber layer overlapped with the stepped thin bamboo strip layer can be increased as much as possible, the contact area of the glass fiber layer is increased, on the other hand, compared with the condition that the whole end part of the thin bamboo strip layer is flush with the end part on the outermost side, a part of the glass fiber layer is wound on the surface of the thin bamboo strip layer, the whole stability cannot be influenced due to the reduction of the thin bamboo strip layer at the socket, and the fitting degree of the thin bamboo strip layer and the glass fiber layer can be further.

(2) According to the pipeline socket, the groove is formed in the full-glass fiber structure in a cutting mode, and compared with the mode of forming the groove in the bamboo skin structure, the groove is prevented from leaking water, so that the durability and the service life of the pipeline socket are improved.

(3) According to the pipeline socket, the boss is formed by continuously winding the glass fiber layer after the glass fiber layer is wound to be flush with the outermost bamboo skin, and the boss and the glass fiber layer are integrally formed, so that a boss structure is prevented from being independently wound, and the integral structure is more compact; the boss 4 and each groove are formed by winding glass fibers, the contact area of the glass fiber layer and the bundle section or the socket to be spliced is large, and the socket made of the glass fiber material is not easy to leak water

(4) The preparation method of the pipeline socket is simple and convenient to prepare, can determine whether the bamboo skin layer is wound firstly or the glass fiber layer is wound firstly according to the descending stair-like or ascending stair-like shape of the bamboo skin layer, can flexibly select the arrangement of the groove and the boss before or after demoulding of the socket structure, and is beneficial to improving the efficiency of the pipeline processing process.

Drawings

Fig. 1 is a sectional view of a pipe socket according to embodiment 1 of the present invention;

fig. 2 is a sectional view of a pipe socket according to embodiment 2 of the present invention;

fig. 3 is a schematic view of the stress direction of the resultant force exerted on the glass fibers and the contact surface between the glass fibers and the thin bamboo strips involved in the pipeline with the socket in embodiment 1 of the present invention;

fig. 4 is a schematic view of the stress direction of the resultant force on the glass fibers and the contact surface between the glass fibers and the thin bamboo strips involved in the pipeline with the socket in embodiment 2 of the present invention;

FIG. 5 is a schematic view of a pipe having spigots at both ends according to example 1 of the present invention;

fig. 6 is a schematic structural view of a socket connection segment according to embodiment 1 of the present invention;

FIG. 7 is a schematic view of a pipe having spigots at both ends according to example 2 of the present invention;

fig. 8 is a schematic structural view of a socket connection segment according to embodiment 2 of the present invention.

In all the figures, the same reference numerals denote the same features, in particular: 1-an inner liner layer, 2-a thin bamboo strip layer, 3-a glass fiber layer, 4-a boss, 5-a first groove, 6-a second groove, 7-a bundle section and 8-a pipeline; 201-innermost bamboo skin, 202-outermost bamboo skin; 301-local reinforcement ends; 701-pier for restraining the thrust source.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

The invention provides a pipeline socket which can be connected with a socket of a pipeline corresponding to the next section by adopting a binding section and can also be connected with a socket of a pipeline corresponding to the next section by adopting a socket joint. Fig. 1 and 2 show two different specific socket structures, respectively, and as shown in fig. 1 and 2, the pipe socket of the present invention includes an inner liner 1, a thin bamboo strip layer 2, a glass fiber layer 3, a boss 4, a first groove 5, and a second groove 6. In the following, two different embodiments are described, respectively.

Specifically, fig. 1 is a sectional structure diagram of a pipeline socket in embodiment 1 of the present invention, and as shown in fig. 1, the pipeline socket of the present invention includes an inner liner layer 1, a thin bamboo strip layer 2, and a glass fiber layer 3. The bamboo skin layer 2 and the glass fiber layer 3 are respectively wound outside the inner liner layer 1.

Wherein, thin bamboo strips used for weaving layer 2 has a plurality of layers, and inner liner 1 is hugged closely to its inlayer thin bamboo strips used for weaving 201, and from inlayer thin bamboo strips used for weaving 201 to outermost thin bamboo strips used for weaving 202, the length that is close to the socket end diminishes gradually, inlayer thin bamboo strips used for weaving 201 has the certain distance between the tip that is close to the tip of socket and the tip of socket, and every layer of thin bamboo strips used for weaving layer tip to socket tip winding has fine layer 3 of glass, and the butt lap of fine layer 3 and every layer of thin bamboo strips used for weaving layer of glass is and level and smooth the alignment.

The 3 outside rings of fine layer of glass are equipped with two at least recesses, and wherein in every pipeline socket, the recess furthest apart from the socket tip is first recess 5, and the recess nearest apart from the socket tip is second recess 6, and the recess that sets up on the fine layer of glass is used for connecting the rubber ring. In addition, the fine layer 3 outside of glass is that one side winding that first recess 5 is close to bamboo thin bamboo strips layer 2 has the boss, is equivalent to after fine layer 3 of glass twines to the thickness (being located the same as the plane parallel and level) with outermost bamboo thin bamboo strips 202 with outermost bamboo strips 202 overlap joint department, continues to twine fine layer 3 of glass and forms the boss 4 structure shown in fig. 1 promptly. Of course, it is within the protection scope of the present invention to continue to wind the thin bamboo strip layer 2 outside the glass fiber layer 3.

In thin bamboo strips layer 2, the axial of the tip that inlayer thin bamboo strips layer 201 is close to the socket and second recess 6 is gone up apart distance L1, and outermost thin bamboo strips layer 202 is the axial of 5 first recesses upward apart distance L3, and L1 and L3's numerical value size is related to pressure level, pipeline pipe diameter, ring rigidity, and pressure is big more, and the pipe diameter is big more, and ring rigidity is big more, and the corresponding thicker length that is of thickness that fine layer socket of glass needs is located. For example, several pipe socket models in practical use are as follows: for DN1000, the axial distance between the end part of the bamboo skin at the innermost layer and the second groove is 30mm (or the same as the second groove), and for DN1500, the axial distance between the bamboo skin layer at the innermost layer and the first groove is 0.

Preferably, L3 is greater than or equal to 0, and first groove 5 is located on one side of innermost bamboo split 201 in the axial direction, which is close to the end of the socket. Of course, the end part of the innermost layer of the thin bamboo strip 201 can be located between the first grooves 5 in the radial direction, and the first grooves 5 are located on one side, close to the boss 4, of the innermost layer of the thin bamboo strip 201 in the axial direction, within the protection scope of the invention, only the radially corresponding structures of the second grooves 6 are required to be guaranteed to be the glass fiber layers 3, namely, the thin bamboo strip layers 2 cannot break through the second grooves 6, and the water leakage risk at the socket caused by the fact that the circulating pressure is increased is avoided.

Further, the axial distance L2 between the outermost bamboo split 202 and the boss 4 is not necessarily related to the value of L1 and L2, but more preferably, the size range of L1 is 30-100mm, and L1 is greater than L2, so as to ensure that the wound glass fiber layer 3 can cover the area with water leakage risk.

Preferably, the distance between the two end parts of the glass fiber layer on the outermost side is 2 times greater than the distance between the two end parts of the glass fiber layer on the innermost side, so that the contact area between the glass fiber layer in the faucet and the beam section or the bell and spigot can be ensured.

Further preferably, the end of the pipe socket is provided with a chamfer structure along the circumferential direction, so that the pipe socket 1 can be conveniently inserted into the bundle section 2.

In embodiment 1 of the invention, on one hand, the boss 4 and each groove are formed by winding glass fibers, the contact area between the glass fiber layer and the bundle section or the bell and spigot to be spliced is large, and the socket made of the glass fiber material is not easy to leak water; on the other hand, the boss continues to twine after the fine layer of glass twines to with the thin bamboo strips used for weaving parallel and level in the outside and forms, and boss and the fine layer of glass are integrated into one piece, have avoided winding boss structure alone for overall structure is more inseparable.

When the pipe socket is arranged, not only the problem of water leakage needs to be considered, but also the problem of stability needs to be considered, the thin bamboo strip layer in embodiment 1 of the invention adopts a stepped structure, and the thin bamboo strip layer is gradually decreased outwards along the axial direction along the innermost layer, so that on one hand, the axial length of the glass fiber layer lapped with the thin bamboo strip layer can be increased as much as possible, and the contact area of the glass fiber layer is increased, on the other hand, the end part of the thin bamboo strip layer is gradually decreased in a stepped manner, and compared with the condition that the whole end part of the thin bamboo strip layer is completely flush with the end part at the outermost side in fig. 1, a part of the glass fiber layer is wound on the surface of the thin bamboo strip layer, the whole stability cannot be influenced by the reduction of the thin bamboo strip layer at the socket, and the fitting.

Fig. 3 is a schematic view of the stress direction of the resultant force of the glass fibers and the contact surface between the glass fibers and the thin bamboo strips involved in the pipe with the socket in embodiment 1 of the present invention, and it is understood that the pipe connection can be not only the joint connection as shown in fig. 3, but also the flange connection, the socket connection, etc., and the stress conditions are all as shown in fig. 3, and a joint 7 is disposed between the sockets corresponding to two pipes 8 as an example, in embodiment 1 of the present invention, the a direction is the thrust of the joint or the socket along the axial direction, the b direction is the force of the abutment along the radial direction, as 701 in fig. 3 is the abutment from the thrust of the joint, the c direction is the resultant force of the glass fibers, and d is the contact surface (step-shaped step-like) of the glass fiber thin bamboo strips in embodiment 1 of the present invention, as can be seen in fig. 3, the resultant force c of the glass fibers and the contact surface d of the thin bamboo strips are nearly perpendicular, and the resultant force, therefore, the structure of the embodiment 1 is stable from the stress angle, and a reinforcing structure is not needed to be additionally arranged.

Preferably, the acute angle formed by the intersection of the glass fiber bamboo strip contact surface d and the glass fiber resultant force c is greater than 45 degrees, that is, the requirement of stable structural stress can be met, and more preferably, the acute angle formed by the intersection of the glass fiber bamboo strip contact surface d and the glass fiber resultant force c is greater than 60 degrees.

In addition, fig. 5 is a schematic view of a pipe having sockets at two ends in embodiment 1 of the present invention, fig. 6 is a schematic view of a structure of a socket connection section related to embodiment 1 of the present invention, and with reference to fig. 5 and 6, in addition to the bundle joint connection shown in fig. 3, one end of the pipe may be a bell-shaped socket end, the other end is a socket end shown in fig. 1, the middle section is a pipe section, and the socket end and the pipe section are formed by winding bamboo splits. The socket end is matched with the socket end of another pipeline structure, and the two opposite shafts are clamped into the socket end, so that the connection between the pipeline and the socket structure end can be realized.

Preferably, the inner diameter of the pipe of the socket section is slightly larger than the outer diameter of the socket end, and the outer diameter of the boss is larger than the outer diameter of the socket end, so that when the socket end is in butt joint with the socket end, the side wall surface of the boss can abut against the end surface of the socket end.

In conclusion, by adopting the socket structure of the embodiment of the invention, when the pipeline is circularly pressed and changed, firstly, the groove is cut on the full glass fiber structure, and the groove does not leak water relative to the groove formed on the bamboo skin structure; secondly, because the contact area of the glass fiber layer is increased, and the cyclic strain resultant force is basically vertical to the contact surface of the glass fiber layer and the bamboo skin layer, the shearing motion cannot be generated at the contact surface. The stability of the whole socket structure can be ensured while water leakage is prevented.

Further, the method for preparing the pipe socket in the embodiment 1 comprises the following steps:

s1: paving or coating a demoulding material on the cylindrical core mould;

s2: winding or bonding an inner liner layer 1 on the periphery of the core mold, wherein the inner liner layer 1 comprises 1 layer of bamboo fiber, 2 layers of knitted felt and 1 layer of grid cloth which are wound and bonded from inside to outside in sequence in a preferred embodiment;

s3: a distance is reserved between the outer wall of the inner lining layer 1 and the port of the insertion opening, and the bamboo skin layer 2 is wound, wherein the bamboo skin at the innermost layer is sequentially wound to the end part of the bamboo skin at the outermost layer, close to the insertion opening, in a descending step shape;

s4: sequentially winding a glass fiber layer 2 from the bamboo skin layer 2 to the end part of the socket along the outer side of the inner liner layer 1, wherein the glass fiber layer is in lap joint with the joint surface of the bamboo skin layer 2 and is aligned flatly;

s5: when the lap joint of the glass fiber layer 3 and the outermost bamboo skin 202 is wound to the thickness (flush with the plane) equal to that of the outermost bamboo skin 202, the glass fiber layer is continuously wound to form a boss 4;

s6: heating and curing the formed pipeline socket structure, wherein the curing temperature selected in the preferred embodiment is 80-85 ℃, and the curing time is 2 hours;

s7: demolding and finishing the cured socket structure, and forming a plurality of grooves on the periphery of the glass fiber layer 2, wherein the grooves are of circular ring structures formed along the circumferential direction, and preferably at least two grooves are formed at intervals along the axial direction; meanwhile, the groove can be formed before or after the demoulding of the pipeline inner liner. Further preferably, an end face chamfer is provided in the end ring direction.

The boss 4 in S5 may be provided after the mold is removed.

Further, fig. 2 is a sectional structure diagram of a pipe socket in embodiment 2 of the present invention. In this embodiment, the tip of thin bamboo strips layer 2 is cascaded progressively from innermost thin bamboo strips 201 to outermost thin bamboo strips 202 to socket department, and 2 tip of thin bamboo strips layer reduce gradually from inside to outside and the distance of socket tip promptly, and different with embodiment 1, outermost thin bamboo strips 202 is minimum with socket tip axial distance, and the design of boss can contain two kinds of situations: the first is that shown in fig. 2, the boss 4 is located outmost thin bamboo strip 202, and after outmost thin bamboo strip and outmost fine glass twine to the parallel and level (thickness such as coplanar), continue to twine the thin bamboo strip layer on outmost thin bamboo strip 202 is close to fine layer one side of glass, form as fig. 2 boss 4 structure. At this moment, boss 4 and thin bamboo strips used for weaving layer 2 are integrated into one piece structure, can guarantee holistic compactness.

Of course, the second boss setting mode, that is, the mode of forming the boss 4 structure by winding the glass fibers, is also within the protection scope of the present invention, on one hand, the glass fiber layer can be directly wound on the outer portion of the outermost bamboo skin 202 close to the glass fiber layer, and on the other hand, the outermost bamboo skin layer at the bottom of the boss 4 in fig. 2 can also be replaced by the glass fiber layer, and at this time, the glass fiber layer is continuous.

Correspondingly, fig. 4 is a schematic view of the resultant force exerted on the glass fibers and the force exerted on the contact surface between the glass fibers and the thin bamboo strips used for manufacturing the pipeline with the socket in embodiment 2 of the present invention. Similarly, taking the example of arranging the joint 7 between the sockets corresponding to the two pipes 8, in embodiment 2 of the present invention, the direction a is the thrust of the joint or the socket along the axial direction, the direction b is the force along the radial direction, as shown in 701 in fig. 4, the direction c is the resultant force exerted on the glass fibers, and the direction d is the contact surface (incremental step shape) of the glass fiber bamboo strip in embodiment 2 of the present invention, as can be seen from fig. 3, unlike embodiment 1, the resultant force exerted on the glass fibers c and the contact surface d of the glass fiber bamboo strip are approximately parallel, the acute angle in the included angle formed between the both is generally less than 45 °, even less than 30 °, at this time, the resultant force of the cyclic strain is approximately parallel to the contact surface, and at this time, the contact surface is likely to generate the shearing motion. Therefore, the local reinforcing end 301 needs to be arranged at the end of the glass fiber, so that the angle between the resultant force c exerted on the glass fiber and the contact surface d of the glass fiber and the bamboo skin approaches to be vertical as much as possible (at least the formed acute angle is larger than 45 °), and the stress is more stable.