CN107687558A - A kind of seabed fiber-reinforced composite flexible pipe combined type buckle arrestor - Google Patents

Abstract

The invention discloses a combined buckle arrester for fiber-reinforced composite flexible pipes, which comprises a metal outer ring and a fiber-reinforced inner ring. The metal outer ring includes a main ring, a locking ring and an elastic sealing washer; the fiber-reinforced The inner ring includes a fiber reinforcement layer and a matrix protection layer; the fiber reinforced inner ring is located on the outside of the composite pipe and is hot-melt bonded to it, which is equivalent to locally thickening the pipe to improve the buckling resistance; the metal outer ring passes through The tight fit is wrapped on the outer side of the fiber-reinforced inner ring, which can assist the fiber-reinforced inner ring to achieve the anti-bending function. Enhances the stress concentration of the inner collar. The invention rationally utilizes the bonding properties of the composite pipe material to realize the processing of the fiber-reinforced inner collar, supplemented by a metal outer collar to increase the local structural strength, has the advantages of steel pipe welding and buckling buckle arresters, and is widely popularized and practical value.

Description

A Combined Buckle Stopper for Submarine Fiber Reinforced Composite Flexible Pipe

technical field

The invention relates to the technical field of marine fiber-reinforced composite flexible pipe auxiliary components, in particular to a combined buckle arrester for deep-sea high-pressure fiber-reinforced composite flexible pipe used in oil or water transportation.

Background technique

The offshore oil and gas industry is facing deeper waters, harsher transportation environments, more complex installation conditions and wider application fields. The material properties of traditional marine steel pipes are increasingly insufficient, including their corrosion resistance, weight, flexibility, etc. Performance hinders its further application and development. In order to overcome these defects, a variety of new marine pipelines using plastic materials have emerged, and the most widely used is thermoplastic fiber reinforced bonded composite pipe (RTP) made of thermoplastic material coated plastic fiber tape winding, RTP pipe in the production process The fiber-reinforced layer and the inner and outer plastic matrix protective layers are bonded together as a whole, which has the advantages of high internal pressure resistance, light weight, strong corrosion resistance, and fatigue resistance.

Regardless of whether it is a fiber-reinforced composite flexible pipe or a steel pipeline pipe, during its service period, local pit defects caused by collisions with other objects, local buckling caused by excessive bending during installation or overload service, and local buckling caused by wear and corrosion The reduction of wall thickness will lead to the weakening of the local buckling resistance of the pipeline, resulting in local buckling and crushing of the pipeline. Because the buckling propagation pressure is smaller than the local buckling pressure, once local buckling collapse occurs, the buckling will propagate along the length of the pipeline at high speed, which may eventually destroy the entire pipeline, causing huge economic and ecological hazards. At present, the buckling problem is mainly solved by designing and installing buckle arresters. The existing buckle arresters are mainly configured for steel pipes, but there are few buckle arresters designed for composite pipes.

Steel pipe buckle arresters are mainly divided into welded buckle arresters, additional buckle arresters, winding buckle arresters and inner ring buckle arresters according to different connection methods. The welded buckle arrester is integrated with the pipes at both ends through fine welding. The buckle arrest effect is very good. It is suitable for submarine steel pipes with medium water depth and large water depth. The disadvantage is that it is easy to produce welding defects and stress concentration, and the welding process requires It is very high, and a certain method needs to be taken to overcome the stress concentration; the additional buckle arrester is fixed on the outside of the pipe through interference fit, and the friction force is used to prevent the buckle arrester from slipping, and no welding is required. It is easy to install and low in cost, and can increase the The hoop stiffness is relatively high, but the efficiency of buckling arrest is low, and the pipes in it may have U-shaped crossing phenomena; the winding buckle arrester is to wrap several rounds of steel bars evenly and tightly on the surface of the steel pipe at a certain angle, instead of the buckle-in type The thick-walled ring sleeve of the buckle arrester can also improve the rigidity of the pipeline in the circumferential direction. The two ends of the steel bars are welded together with the pipe to fix the position of the buckle arrester on the pipe and prevent sliding. Its structure is simple and easy to install. Low bending stiffness, generally does not produce bending stress concentration points, but the disadvantage is that the bending arrester efficiency is not high, and the strength is smaller than other bend arresters; the inner ring bend arrester is also a ring sleeve, mainly used Tube in tube.

From the perspective of the use environment, the application conditions of fiber-reinforced composite flexible pipes are more complicated, and they must bear greater bending and longer spanning distances, especially in seabed laying. Composite pipes have created a huge challenge. Fiber-reinforced composite flexible pipes may buckle throughout their service life. Buckling will lead to fiber failure, matrix cracking, plastic yielding or delamination of composite pipes. At present, for small-diameter and applied For composite pipes with low conditions, appropriately increasing the wall thickness of the pipe, especially the thickness of the reinforcement layer, can suppress the buckling of the pipe to a certain extent, but for large-diameter pipes, complex service conditions and external high pressure in deep sea, the thickness must be greatly increased to prevent buckling. The pipe wall does not meet the economic requirements. In summary, it is a more reasonable solution to install a buckle arrester for the composite pipe, and a suitable form of buckle arrester needs to be selected.

For steel pipes, there is little difference in performance in different directions. Different from steel pipes, because the material properties and structural characteristics of fiber reinforced composite flexible pipes are quite different from those of steel pipes, especially the circumferential and radial performances of composite pipes are quite different from the axial performance, so steel pipes Flexors cannot be used directly on fiber reinforced composite flexible pipes. Considering the different buckle arresters, the welded buckle arrester used for steel pipes with better buckling stop effect cannot be directly welded with the composite pipe; the additional buckle stopper must first ensure the interference connection with the pipe body, otherwise the buckle stopper The efficiency is very low, and the large bending of the composite pipe is likely to cause stress concentration at the edge of the additional buckle arrester, and the radial performance of the composite pipe is weak, which is easy to cause large deformation, crushing and cracking of the pipe body; The steel bars of the bender cannot be welded to the pipe body, and cannot cooperate with the composite pipe to form an effective whole. Therefore, it is urgent to propose a buckle arrester specially for composite pipes to overcome the defects in the prior art.

Contents of the invention

The technical problem to be solved by the present invention is to provide a submarine fiber-reinforced composite pipe in view of the fact that there is no buckle arrester suitable for composite pipes in the prior art. The combined buckle arrester for flexible pipes does not cause damage and other failures to the composite pipe body while improving the buckle arrester efficiency.

The present invention is realized by adopting the following technical solutions: a combined buckle arrester for a submarine fiber reinforced composite flexible pipe, the composite flexible pipe includes an outer protective layer, a reinforcement layer and an inner liner sequentially from the outside to the inside, and the combined buckle arrester It includes a fiber-reinforced inner ring and a metal outer ring, the fiber-reinforced inner ring is arranged on the outside of the composite flexible pipe reinforcement layer, and is hot-melt bonded with the composite flexible pipe reinforcement layer; the metal outer ring is arranged in the fiber-reinforced inner Outer side of the collar and an interference fit with the fiber reinforced inner collar.

Further, the metal outer ring includes a main collar and a locking collar, the main collar is a cylindrical sleeve, a raised ring is provided on the inner wall at one end of the main collar, and an inner ring is processed on the inner wall at the other end. screw thread; the locking collar is set between the main collar and the composite flexible pipe processed at one end of the internal thread, and is threadedly connected with the main collar, that is, the outer surface of the locking collar is processed with a The thread matches the external thread.

Further, the fiber-reinforced inner sleeve is manufactured on the outer surface of the reinforced layer of the composite flexible pipe by hot-melt winding technology and bonded thereto. The fiber-reinforced inner sleeve includes a fiber-reinforced layer and a matrix protection layer, and the fiber-reinforced layer is similar to Composite flexible pipe reinforcement layer is a sleeve structure formed by fiber tape pre-impregnated with hot-melt matrix liquid and wound right and left, and there are no restrictions on the type, winding angle, layer density, etc. of the fiber tape. The matrix material of the outer protective layer is the same, and the fiber material can be the same or different; the fiber reinforced layer covers and bonds the outer side of the reinforced layer of the composite flexible pipe, and the matrix protective layer covers and bonds the outer side of the fiber reinforced layer, and is connected with the outer protective layer of the composite flexible pipe. Layer bonding, all adjacent layers are hot-melt bonded without leaving gaps, so that the fiber-reinforced inner collar and the composite flexible pipe are fused into a whole.

Further, the two ends of the fiber-reinforced inner collar transition to the composite flexible pipe through a transition cone respectively, and the raised ring and the locking collar are evenly matched with the transitional tapered surface, such as the protrusion ring and the locking collar The cross-section can be a right-angled trapezoid to match the slope of the transition cone, that is, after the locking collar is screwed between the main collar and the composite flexible pipe, the front slope of the locking collar, the rear slope of the raised ring and the transition The oblique taper cooperates to clamp and lock the fiber-reinforced inner collar in the middle.

Further, the thickness of the fiber reinforced layer is not less than the thickness of the reinforced layer of the composite flexible pipe, the thickness of the matrix protective layer is not less than the thickness of the outer protective layer of the composite flexible pipe, the matrix material is consistent with the matrix material of the fiber reinforced layer, and the thickness of the matrix protective layer The length is consistent with the length of the fiber reinforced layer, and bonded with the fiber reinforced layer to form a complete sleeve.

Further, elastic sealing gaskets are also provided on the inner wall of the raised ring and the inner wall of the locking collar, and the elastic sealing gasket is made of a high-density rubber ring, bonded and connected with the raised ring and the locking collar, and elastic The thickness of the sealing gasket is greater than the thickness of the gap between the raised ring of the main collar and the locking collar and the composite flexible pipe. Therefore, after the metal outer ring is installed, the elastic sealing gasket is squeezed and deformed due to interference, which can form Good sealing effect.

Further, the inner diameter of the main collar is slightly smaller than the outer diameter of the fiber-reinforced inner collar, and the inner diameter of the raised ring is larger than the outer diameter of the composite flexible pipe.

Further, the length of the main collar is greater than the length of the fiber-reinforced inner collar.

Further, the main collar is composed of two symmetrical saddle plates with a semicircular cross-section. The two saddle plates are hinged on one side and bolted on the other side, so that the fiber-reinforced inner collar can be directly buckled and pressed. The internal threads on the plate are interconnected, and the connected main collar has a complete thread path.

Further, the locking collar is formed by splicing two semicircular rings, and intercommunicating external threads are provided on the outer surfaces of the two semicircular rings, and the outer wall of the spliced locking collar has a complete thread path, which can be along The main collar is externally threaded into its interior.

Compared with prior art, advantage and positive effect of the present invention are:

The combined buckle arrester for composite flexible pipe proposed by the present invention includes a fiber-reinforced inner collar and a metal outer collar:

Firstly, a fiber-reinforced inner collar is set outside the outer protective layer of the pipe, and the fiber-reinforced inner collar and the pipe body are bonded together by hot-melt bonding, in which the wound fiber reinforcement layer similar to the reinforcement layer structure is used to lift the local ring of the pipe. It can be regarded as a local thickening of the composite flexible pipe layer after being bonded with the pipe reinforcement layer, which ensures that the performance of the buckle arrester pipe section and other pipe sections maintains the same structural section, effectively improving the buckling resistance of the pipe without weakening Other properties of the pipeline (tensile performance, internal pressure resistance, etc.) are equivalent to welded buckle arresters for steel pipes; from the perspective of local design, the fiber type, density, and winding angle of the fiber reinforcement layer can be based on the actual requirements of the pipeline. It is adjusted to enhance the buckling resistance and has high flexibility; the tapered transition at both ends of the fiber-reinforced layer smoothes the stress distribution and prevents stress concentration in the transition section; the matrix protective layer effectively protects the fiber-reinforced layer and prevents its structure from being worn and corrosion.

The metal outer ring wrapped on the outside of the fiber-reinforced inner ring also has the effect of anti-bending. The interference fit with the fiber-reinforced inner ring is formed by crimping, which further increases the hoop stiffness of the buckle arrester, and through the metal component The rigidity overcomes the bending of the pipe in the buckle arrester section to reduce the local bending stress, and at the same time protects the fiber-reinforced inner collar that is prone to excessive wear and damage due to local protrusion during laying, which plays a very good auxiliary role, similar to steel pipes buckle buckle arrester.

From the point of view of local design, first, the setting of the elastic sealing gasket overcomes the problem that the fiber-reinforced inner ring is easily worn at the non-interference section with the metal outer ring, and also has the function of sealing to prevent the inner interference section from being damaged. Corrosion leads to changes in the structure and its performance; second, the setting of the left and right transition cones is also reasonable. The metal outer ring is axially fixed, and there is no need to form excessive interference pressure on the outer surface of the fiber-reinforced outer ring to use frictional limit. This design takes into account the lack of radial performance of the composite flexible pipe, and will not cause damage to the pipe in the buckle stop section. Excessive radial deformation; third, even if the interference pressure of the metal outer ring on the fiber-reinforced inner ring is too large due to uncontrollable factors, the buckle pressure of the metal ring only acts on the inner ring. Local rigidity enhancement can effectively reduce the radial deformation of the pipe; Fourth, the split structure of the metal outer ring and the locking collar facilitates the installation and removal of the buckle arrester, and the design of the locking collar facilitates the installation and removal of the metal outer ring. Adjustment of the degree of fit with the fiber-reinforced inner collar.

In a word, the present invention combines the fiber-reinforced inner collar and the metal outer collar, which is similar to the combination of the steel pipe welding buckle arrester and buckle buckle arrester. After fully considering the actual structure and material characteristics of the composite flexible pipe, application conditions and other factors, after analyzing the deficiencies of each buckle arrester and rationally utilizing its advantages, a new combined buckle arrester is designed, which greatly increases the composite flexible pipe. the stopping efficiency.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the combined buckle arrester described in the embodiment of the present invention;

Fig. 2 is a schematic exploded view of the structure of the combined buckle arrester described in the embodiment of the present invention;

Fig. 3 is a schematic cross-sectional view of the combined buckle arrester according to the embodiment of the present invention.

detailed description

In order to understand the above-mentioned purpose, features and advantages of the present invention more clearly, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

This embodiment discloses a combined buckle arrester for a submarine fiber-reinforced composite flexible pipe. For the convenience of description, the flexible pipe will be referred to as a composite pipe hereinafter. Referring to Figures 2 and 3, the composite pipe 1 includes external protection from the outside to the inside. Layer 11, reinforced layer 12 and inner liner 13, the combined buckle arrester includes a fiber reinforced inner collar 2 and a metal outer collar 3, as shown in Figure 3, the fiber reinforced inner collar 2 includes a fiber reinforced layer 21 and The structure and manufacturing method of the matrix protection layer 22 and the fiber reinforcement layer 21 are similar to the reinforcement layer 12 of the composite pipe 1, and they are all made of fiber strips pre-impregnated with heated and melted thermoplastic matrix through machine winding. The fiber-reinforced layer 21 covers the surface of the reinforced layer 12, which is equivalent to thickening the reinforced layer 12. After comprehensive consideration of the hoop stiffness enhancement effect, radial deformation performance, and pipeline load of the fiber-reinforced inner jacket, the thickness is set to be 100% to 120% of the reinforcement layer, fiber tape laying density (mass ratio), and fiber tape winding angle can be different from the reinforcement layer 12, depending on the requirements for anti-buckling under different application conditions and environmental conditions. The matrix protective layer 22 is a protective layer covering and bonded to the outer surface of the fiber reinforced layer 21, similar to the outer protective layer 11 of the composite pipe 1, the matrix material is the same, and the thickness is 100% to 120% of the outer protective layer 11 , has the effect of water-proof, anti-corrosion and anti-wear.

Correspondingly, both ends of the fiber-reinforced layer 21 are transitional tapered surfaces 23 from thick to thin, and the tapered angle does not exceed 45°. During processing, the tapered surface is kept as smooth as possible, and the base protective layer 22 is also evenly covered on the tapered surface. face. The fiber reinforced layer 21, the matrix protective layer 22, the reinforced layer 12, and the matrix protective layer 22 and the outer protective layer 11 are thermally bonded through the matrix of the same material without leaving gaps, so that the fiber reinforced inner collar 2 and the composite pipe 1 fused into a whole.

The metal outer collar 3 includes a main collar 31 and a locking collar 32. The metal outer collar 3 covers the outer surface of the fiber-reinforced inner collar 2 to increase the strength of the buckle arrester and resist pipe bending. The main collar 31 is a metal cylinder, preferably made of steel, whose length is slightly longer than that of the fiber-reinforced inner collar 2, and the ratio is about 110%-115%. Both ends of the inner wall are specially processed: one end is provided with a raised ring 33 through a transition cone, the inner diameter of the raised ring 33 is larger than the outer diameter of the composite pipe 1, and the transitional cone between the raised ring 33 and the fiber reinforced layer 22 23 contour matches; the inner wall of the other end is processed with internal thread 34. The inner diameter of the main collar 31 is slightly smaller than the outer diameter of the fiber-reinforced inner collar 2 , and the main collar 31 is buckled in, so an interference contact is produced. The locking collar 32 is a circular ring with a trapezoidal cross-section, and its material is consistent with that of the main collar 31 . The front end surface of the locking collar 32 is a conical surface, matching with the contour of the transitional conical surface 23 . In addition, elastic sealing gaskets 35 are arranged on the inner walls of the locking collar 32 and the raised ring 33. The shape of the elastic sealing gaskets 35 is a thin-walled ring, and the material is high-strength rubber. The rubber is required to be waterproof and corrosion-resistant. Fatigue performance, its thickness is greater than the difference between the inner diameter of the main collar 31 raised ring 35 and the outer diameter of the composite pipe 1, and the difference between the inner diameter of the locking collar 32 and the outer diameter of the composite pipe 1, the purpose is to be between the above two structural gaps Extruded to produce a certain initial interference, in order to protect the pipe body, disperse stress and shock absorption.

For the convenience of installation, the main collar 31 is designed as two saddle plates with a semicircular section, one side (A side) of the two saddle plates is hinged, and the other side (B side) is connected by bolts to form a complete The main collar, the bolt joint is a radially protruding strip flange plate 36, on which a threaded hole 37 is processed. After the two saddle plates are docked, the threaded holes 37 at the same positions are also aligned when the two eye plates 36 are close to each other. The locking collar 32 can be processed into two symmetrical semi-circular rings, and the outer surface of the locking collar 32 spliced by the semi-circular rings forms a complete external thread, which can be docked with the internal thread 34 of the main collar.

For the combined buckle arrester described in this embodiment, when in use, the fiber-reinforced inner collar can be set in various ways, and the outer protective layer of the composite pipe can be stripped off for setting, or it can be placed on the The manufacturing process is directly arranged on the outside of the reinforced layer of the composite pipe for which the outer protective layer has not been prepared. First, select the position of the buckle arrester, and wrap the fiber prepreg wrapping tape in two directions at a certain angle at the specified position until the fiber reinforced layer reaches the specified thickness. During the processing, the starting and ending points of each layer of winding are different, so that the Both ends are processed into a transitional tapered surface, and the fiber reinforced layer is made after the matrix is cooled and solidified; then the matrix protective layer is uniformly processed on the outside of the fiber reinforced layer, and the matrix protective layer is connected with the outer protective layer of the composite pipe, the matrix protective layer and the fiber reinforcement. Layers and the fiber-reinforced layer and composite pipe-reinforced layer are both hot-melt bonded without leaving gaps, so that the fiber-reinforced inner ring and the composite pipe are fused into a whole.

After the preparation of the fiber-reinforced inner sleeve is completed, the main sleeve with the elastic sealing gasket set is buckled and pressed on the outside of the fiber-reinforced inner sleeve, and the raised ring transition cone of the main sleeve is close to the fiber-reinforced inner sleeve by a slight movement Ring transition cone, maintain the structural position and lock the main collar with bolts; then butt the locking collar to complete the thread passage and install the elastic sealing washer, and then screw the locking collar into the gap between the main collar and the composite pipe , until the front end of the locking collar and the transition cone of the fiber-reinforced inner collar fit tightly and produce a certain interference, and finally lock the thread to complete the entire installation process. At this time, the metal outer collar has interference with the fiber-reinforced inner collar The axial displacement is contacted and limited, and the overall structure schematic diagram is shown in Figure 1.

In the combined buckle arrester proposed by the embodiment of the present invention, the fiber-reinforced inner collar is a structure bonded together with the composite pipe, which is used to improve the local strength of the pipe, especially the hoop stiffness, and can be regarded as a part of the reinforcement layer , the pipe section of the buckle arrester maintains the same structural section performance as other pipe sections, which effectively improves the buckling resistance of the pipeline without weakening other performances of the pipeline. In the fiber-reinforced inner sleeve, the fiber type, density, and winding angle of the fiber-reinforced layer can be adjusted according to the actual requirements of the pipeline to enhance the buckling resistance, which has high flexibility; the tapered surface transition at both ends of the fiber-reinforced layer is smooth Stress distribution is improved to prevent stress concentration in the transition section; the matrix protection layer effectively protects the fiber reinforcement layer.

In order to make up for some deficiencies after the fiber-reinforced outer ring is installed, the metal outer ring is added to cooperate with the fiber-reinforced outer ring. The metal outer ring also has the effect of anti-bending, and the interference fit with the fiber-reinforced inner ring is formed by crimping. Reasonably share the internal and external pressure loads on the fiber reinforced layer, further increase the hoop stiffness of the buckle arrester, and overcome the bending of the pipe in the buckle arrester section through the rigidity of the metal components to reduce the local bending stress, and at the same time protect the The fiber-reinforced inner collar, which protrudes locally and is prone to excessive wear and damage, plays a very good auxiliary role. The existence of the metal outer ring increases the overall strength of the buckle arrester, and the structural design is ingenious and reasonable.

In the metal outer ring, the setting of the elastic sealing gasket overcomes the problem that the fiber-reinforced inner ring is easily worn at the non-interference section with the metal outer ring, and also has the function of sealing; On the other hand, the metal outer ring is axially fixed by the interference fit of the tapered surface. It is not necessary to form excessive interference pressure on the outer surface of the fiber-reinforced outer ring to use the friction limit. This design takes into account Insufficient radial performance of the composite pipe will not cause excessive radial deformation of the pipe in the buckle arrester section; because the buckle pressure of the metal collar only acts on the fiber-reinforced inner collar, and the pipe section with the fiber-reinforced inner collar It has higher strength to withstand the radial deformation caused by the crimping of the metal outer ring; the split structure of the metal outer ring and the locking ring facilitates the installation and removal of the buckle arrester, and the design of the locking ring facilitates the metal outer ring Adjustment of the degree of fit between the ring and the fiber-reinforced inner collar.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention to other forms. Any skilled person who is familiar with this profession may use the technical content disclosed above to change or modify the equivalent of equivalent changes. The embodiments are applied to other fields, but any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention still belong to the protection scope of the technical solutions of the present invention without departing from the content of the technical solutions of the present invention.

Claims (10)

1. a kind of seabed fiber-reinforced composite flexible pipe combined type buckle arrestor, composite and flexible pipe includes outer guarantor successively from outside to inside Sheath, enhancement layer and inner liner, it is characterised in that combined type buckle arrestor includes fiber reinforcement inner sleeve and metal-coating ring, institute State the outside that fiber reinforcement inner sleeve is arranged on composite and flexible pipe enhancement layer, and with composite and flexible pipe enhancement layer hot melting cohesion；Institute State metal-coating ring to be arranged on the outside of fiber reinforcement inner sleeve, and be interference fitted with fiber reinforcement inner sleeve.

2. combined type buckle arrestor according to claim 1, it is characterised in that：The metal-coating ring includes the main collar and lock Tight set ring, the main collar are a cylindrical sleeve, and main collar one end inwall is provided with protruding ring, is machined with other end inwall Internal thread；It is described locking the collar be arranged between the main collar and the composite and flexible pipe for being machined with internal thread one end, and with the main collar Threaded connection.

3. combined type buckle arrestor according to claim 2, it is characterised in that：The fiber reinforcement inner sleeve adds including fiber Strong layer and matrix protective layer, fabric reinforcement are covered and are bonded on the outside of composite and flexible pipe enhancement layer, and matrix protective layer covers simultaneously It is bonded on the outside of fabric reinforcement, and is bonded with composite and flexible pipe covering, fiber reinforcement inner sleeve and composite and flexible pipe heat Fusible knot is integral.

4. combined type buckle arrestor according to claim 3, it is characterised in that：The fiber reinforcement inner sleeve both ends lead to respectively A transition conical surface transition is crossed to composite and flexible pipe, and protruding ring and the locking collar are engaged with the transition conical surface.

5. combined type buckle arrestor according to claim 3, it is characterised in that：The thickness of the fabric reinforcement is not less than multiple The thickness of flexible pipe enhancement layer is closed, the thickness of matrix protective layer is not less than the thickness of composite and flexible pipe covering, matrix protection The length of layer is consistent with fabric reinforcement length.

6. the combined type buckle arrestor according to claim 4 or 5, it is characterised in that：The protruding ring inwall and the locking collar Elastic packing packing ring is additionally provided with inwall, the elastic packing packing ring uses high density rubber ring.

7. combined type buckle arrestor according to claim 6, it is characterised in that：The main collar internal diameter is slightly less than fiber reinforcement Inner sleeve external diameter, protruding ring internal diameter are more than composite and flexible pipe external diameter.

8. combined type buckle arrestor according to claim 7, it is characterised in that：The length of the main collar is more than fiber reinforcement The length of inner sleeve.

9. combined type buckle arrestor according to claim 8, it is characterised in that：The main collar is by two symmetrical sections Semicircular saddle plate composition, the side of two saddle plates are hinged, opposite side bolt connection.

10. combined type buckle arrestor according to claim 9, it is characterised in that：The locking collar is spelled by two semicircular rings Connect to be formed, and the external screw thread of intercommunication is provided with two semicircular ring outer surface.