CN213809441U - Plastic corrugated pipe joint for prestress - Google Patents

Abstract

The utility model provides a corrugated plastic tubing connects for prestressing force, including connecting the body, connect body both ends to be connected with two sections corrugated plastic tubing pipe joints for prestressing force respectively, still include heat shrinkage bush and sealing washer, the cladding is just extended to the outer circumference of joint body to the heat shrinkage bush cladding the outer wall of corrugated plastic tubing pipe joint, connect the body with corrugated plastic tubing pipe joint complex inner wall sets up the toper structure that reduces gradually from shallow to dark diameter. The utility model has the advantages of simple structure, when can solving the pipe-sealing problem to make the junction have certain pliability, greatly improved the quality of prestressing force with plastic corrugated pipe connection, more accord with operating condition's application, the electrical monitoring of prestressing force steel beam provides basic guarantee in more the pipeline.

Description

Plastic corrugated pipe joint for prestress

Technical Field

The utility model belongs to prestressing force construction field, a plastic corrugated pipe connects for prestressing force.

Background

The corrugated pipes for prestressing are mainly classified into two categories: the corrugated pipe comprises a first corrugated metal pipe and a second corrugated plastic pipe. The metal corrugated pipe is manufactured by taking a metal steel strip as a raw material through a winding and pressing forming process, and has the defects of poor sealing property and corrosion resistance. The plastic corrugated pipe is formed by one-step extrusion molding through the die, the water tightness and the air tightness are good, and the formed closed space not only improves the durability of the prestressed reinforcement in the pipeline, but also provides conditions for electrical monitoring of the prestressed steel bundles. The friction coefficient of the plastic corrugated pipe is lower than that of the metal corrugated pipe, so that the friction loss of the prestressed tendons in the stress process is reduced, and the application of the plastic corrugated pipe has an active promoting effect on the technology of lifting prestressed pipelines. When a plastic corrugated pipeline is used for forming a closed space, the problem of connection between two sections of pipes needs to be solved, and the connected nodes also need to have good tightness.

In the prior art, a plurality of corrugated pipe connection node structures exist, for example, a round pipe sealing joint which is disclosed in Chinese patent CN205136927U and is used for connecting bamboo-like prestressed plastic pipes and provided with exhaust pipes is formed by butting a first semi-round pipe and a second semi-round pipe; an exhaust pipe is arranged at the outer edge of the first semicircular pipe; the inner rings of the first semicircular pipe and the second semicircular pipe are respectively provided with two large annular grooves, two small annular grooves and a sealing gasket groove; a sealing gasket groove is respectively arranged on two sides of each large annular groove; the two large annular grooves are respectively wrapped on large annular ribs at the end parts of the bamboo-shaped prestressed plastic pipes; the two small annular grooves are respectively wrapped on small annular ribs at the end parts of the bamboo-shaped prestressed plastic pipes; and sealing gaskets are respectively arranged in the sealing gasket grooves.

The circular pipe joint mentioned in the structure or the current standard JT/T529 and 2016 plastic corrugated pipe for prestressed concrete bridges has the following defects: the sealing ring is composed of a plurality of parts, namely semicircular clamping flaps with exhaust holes (clamping flaps need to be provided with sealing ring grooves, clamping grooves and exhaust holes and need to be manufactured by independent die sinking), semicircular clamping flaps without exhaust holes (clamping flaps need to be provided with sealing ring grooves and clamping grooves and need to be manufactured by independent die sinking), sealing rings (the sealing rings are special-shaped sealing rings and need to be manufactured by independent die sinking), and two locking wedge-shaped inserting plates (need to be manufactured by independent die sinking), and the sealing ring is complex in structure and needs to be opened by 4 die sinking; two-segment sealing is adopted, the sealing failure risk is enlarged, and the requirement on the matching of sealing rings of two segments is high; the locking wedge-shaped inserting plates are weak, when the sealing ring is used, the sealing ring is completely compressed by the two thinner locking wedge-shaped inserting plates, the two semicircular clamping flaps are buckled, stress is concentrated at the folding angle, the folding angle is deformed or cracked, and sealing is invalid; fourthly, the locking wedge-shaped inserting plates are difficult to install, after the locking wedge-shaped inserting plate on one side is installed firstly, the other half is tilted due to the fact that one side of the locking wedge-shaped inserting plate is tightly pressed, the other side of the locking wedge-shaped inserting plate is difficult to install, and the two locking wedge-shaped inserting plates are required to be installed and simultaneously follow; and fifthly, when the whole structure is applied, the stress is unreasonable. When the water pressure or air pressure tightness detection is carried out in the assembled pipeline, annular external extrusion force is formed in the pipeline, and is transmitted to the locking wedge-shaped inserting plate through the two semicircular clamping flaps to increase the concentrated stress, so that the locking wedge-shaped inserting plate is easy to deform, and the sealing is ineffective; sixth, the overall structure is poor in flexibility, when the prestressed pipeline is designed, installed and applied, the prestressed pipeline cannot be a straight line, bending at a certain angle exists, transverse force is applied when the prestressed pipeline is bent, the buckling stress of the structure is longitudinal force (namely, the two semicircular clamping flaps and the locking wedge-shaped inserting plate are in longitudinal rigid connection), and the prestressed pipeline cannot adapt to the transverse load applied in practical application.

The flat pipe joint and the circular pipe joint in the existing standard JT/T529 and 2016 (Plastic corrugated pipe for prestressed concrete bridge) have different joint structures and connection principles, and have the following defects: the structure is complex, and 4 die sinking are needed; and the water tightness and the air tightness are unreliable, and the connection part is in direct surface contact with the flat clamp respectively and directly with the flat plastic pipe joint, the flat tee joint and the flat straight through without sealing measures.

In conclusion, the connection between two sections of plastic corrugated pipes is solved, the function of the plastic corrugated pipes is greatly exerted, and the connection of the two sections of corrugated pipes has good sealing performance and good flexibility. For the production and construction costs, the structure is simple, easy to manufacture and easy to install.

SUMMERY OF THE UTILITY MODEL

The utility model provides a plastic corrugated pipe joint for prestressing force, this structure and when can solving the pipe-line sealing problem to make the junction have certain pliability, can reduce the influence of installation error to the construction betterly, very big degree has improved the quality of plastic corrugated pipe connection for prestressing force, more accords with operating condition's application, and the electrical monitoring of prestressing force strand in the pipeline provides basic guarantee.

The technical scheme of the utility model as follows:

a plastic corrugated pipe joint for prestress comprises a joint body, wherein two ends of the joint body are respectively connected with two plastic corrugated pipe joints which are connected in advance, the joint body further comprises a heat-shrinkable sleeve and a sealing ring, the heat-shrinkable sleeve is coated on the outer circumference of the joint body and extends to coat the outer wall of the plastic corrugated pipe joints, and the inner wall of the joint body matched with the plastic corrugated pipe joints is of a conical structure with the diameter gradually reduced from shallow to deep;

the top of the first wave crest of the plastic corrugated pipe joint is in interference fit connection with the joint body, the top of the second wave crest of the plastic corrugated pipe joint is in clearance fit connection with the joint body, the first wave crest is defined as the deepest wave crest, and the second wave crest is defined as the second deep wave crest;

an inner boss is arranged in the middle of the inner wall of the joint body in the axial direction, and the inner boss is in sealing butt joint with the side wall of the wave crest at the innermost side of the plastic corrugated pipe section through a sealing ring.

The utility model discloses a heat shrinkage bush adopts double seal with the combined seal who connects the body, and sealing performance is good.

The utility model discloses a connect two places of body and adopt interference fit and clearance fit respectively, both guaranteed sealing performance, guaranteed flexibility. The joints are in clearance fit or flexible connection, and the whole system is stressed annularly, so that the whole system has certain impact resistance, flexibility, bending resistance and construction convenience, and the sealing performance of the pipeline system is more reliable in application and easy to popularize and apply.

The utility model discloses an integral joint body compares original structure and need open 3 ~ 4 moulds, and this connector only need open 1 mould can, the structure is also simple, with low costs, easily popularizes and applies.

Preferably, the inner diameter of the sealing ring is in interference fit with the outer diameter of the trough of the plastic corrugated pipe joint, the outer diameter of the sealing ring when the sealing ring is sleeved on the trough of the plastic corrugated pipe joint is larger than the outer diameter of the wave crest of the plastic corrugated pipe joint, the outer diameter of the sealing ring is in interference fit with the inside of the connector body 3, and the inner wall and the outer wall of the sealing ring are in interference fit to ensure the sealing performance.

Preferably, the sealing ring is one of an O-shaped rubber or a silica gel sealing ring. Simple structure, convenient installation and low cost.

Preferably, the number of wave crests sleeved on the plastic corrugated pipe joints at any one side of the joint body is more than 2, so that the sealing performance is better ensured.

Preferably, the inner wall of the heat-shrinkable tube is coated with the hot melt adhesive, and the inner wall of the heat-shrinkable tube contains the hot melt adhesive, and is tightly attached to the plastic corrugated tube joint and the connector body after installation, so that the capability of resisting longitudinal force and transverse force of the whole connecting system can be enhanced, and a double-sealing effect is achieved. The wrapping range after the installation of the heat-shrinkable sleeve needs to be larger than the wave crest of at least one plastic corrugated pipe joint outside either side single edge of the joint body, and the sealing performance of connection is further improved.

Preferably, the inner boss is constructed in a full-ring structure arranged on the inner wall of the joint body, and the joint is simple in structure, convenient to process and low in cost.

Preferably, the joint body is a plastic product, so that the joint is low in cost, good in flexibility and convenient to install

Preferably, the inner boss is an axially arranged inner boss arranged on the inner wall of the joint body, the number of the inner bosses is more than 3, the inner bosses are uniformly distributed on the circumferential surface, and a rib form is adopted, so that the structure is simplified, the size of the inner boss is smaller, and the light weight is facilitated.

The utility model has the advantages that:

1. the circular connector without the exhaust holes of the prestressed plastic corrugated pipe is sealed by the combination of the heat-shrinkable sleeve and the connector body, adopts double sealing, and has the advantages of good sealing performance, simple structure and low cost.

2. Compare original structure and need open 3 ~ 4 moulds, this connector only need open 1 mould that circular no exhaust hole connects can.

3. The utility model discloses a there is clearance fit or flexonics, entire system in the junction for the hoop atress, makes the entire system have the convenience of certain impact resistance, pliability, bending resistance, construction to make pipe-line system's leakproofness more reliable when using, easily promote and use.

4. The utility model discloses a structure can adopt the same principle, adapts to circular plastic tubing coupling and flat plastic tubing coupling simultaneously, and this structure has great using value, easily promotes and uses.

Drawings

Fig. 1 is a schematic structural view of a plastic corrugated pipe joint for prestressing according to the present invention.

Fig. 2 is a schematic sectional structure view of the joint body according to the present invention.

Fig. 3 is a schematic structural diagram of the sealing ring of the present invention mounted on a plastic corrugated pipe joint.

Fig. 4 is a schematic structural diagram of the sealing ring of the present invention.

Fig. 5 is a perspective view of a joint body according to embodiment 3 of the present invention.

Fig. 6 is a schematic structural view of a sealing sleeve according to embodiment 5 of the present invention.

Fig. 7 is a structural view of the sealing boot of embodiment 5 of the present invention mounted on a plastic bellows joint.

Fig. 8 is a schematic view of the overall structure of embodiment 5 of the present invention.

Fig. 9 is a schematic view of the overall structure of embodiment 6 of the present invention.

Fig. 10 is a schematic structural view of a plastic bellows joint according to embodiment 7 of the present invention.

Fig. 11 is a schematic structural view of a joint body according to embodiment 7 of the present invention.

Fig. 12 is a schematic perspective view of a joint body according to embodiment 2 of the present invention.

In the figure: 1-plastic corrugated pipe joint, 11-first wave crest, 12-second wave crest, 2-heat-shrinkable sleeve, 3-joint body, 31-inner boss, 32-vent hole, 4-sealing ring and 5-sealing sleeve.

Detailed Description

The invention will be further described with reference to the accompanying drawings and specific embodiments, which are illustrative of the invention and are not to be construed as unduly limiting the invention.

In the description of the present invention, it is to be understood that the terms "left", "right", "upper", "lower", "front", "rear", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply specific orientations that the device or structure indicated must have, be constructed in specific orientations, and operations, and therefore, should not be construed as limiting the present invention.

Example 1:

as shown in fig. 1 and 2, a plastic bellows joint for prestressing, comprising a joint body 3, the two ends of the joint body 3 are respectively connected with two pre-connected plastic corrugated pipe joints 1, and the joint further comprises a heat-shrinkable sleeve 2 and a sealing ring 4, the heat-shrinkable sleeve 2 is coated on the outer circumference of the joint body 3 and extends to coat the outer wall of the plastic corrugated pipe joint 1, the inner wall of the joint body 3 matched with the plastic corrugated pipe joint 1 is set to be a conical structure with the diameter gradually reduced from shallow to deep, the top of the first wave crest 11 of the plastic corrugated pipe joint 1 is connected with the joint body 3 in an interference fit manner, the top of the second wave crest 12 of the plastic corrugated pipe joint 1 is in clearance fit connection with the joint body 3, an inner boss 31 is arranged in the axial middle of the inner wall of the joint body 3, and the inner boss 31 is in sealing abutting connection with the side wall of the wave crest at the innermost side of the plastic corrugated pipe joint 1 through a sealing ring 4.

Example 2:

as shown in fig. 1 and 2, a plastic corrugated pipe joint for prestressing comprises a joint body 3, wherein two ends of the joint body 3 are respectively connected with two plastic corrugated pipe joints 1 which are connected in advance.

In this embodiment, the plastic bellows joint 1 is a circular plastic bellows joint 1, and the joint body 3 is configured as a circular joint without an exhaust hole.

The heat-shrinkable tube 2 is wrapped on the outer circumference of the joint body 3 and extends to wrap the outer wall of the plastic corrugated tube joint 1, and the inner wall of the joint body 3 matched with the plastic corrugated tube joint 1 is of a tapered structure with the diameter gradually reduced from shallow to deep;

as shown in fig. 2 and 3, the top of the first peak 11 of the plastic corrugated pipe joint 1 is connected with the joint body 3 in an interference fit manner, i.e., Φ a is greater than Φ F, so that the plastic corrugated pipe joint 1 can be conveniently inserted into the joint body 3; the top of a second wave crest 12 of the plastic corrugated pipe joint 1 is in clearance fit connection with the joint body 3, namely phi B is less than phi F, so that the plastic corrugated pipe joint 1 can be clamped conveniently, the first wave crest 11 is defined as the wave crest at the deepest part, and the second wave crest is defined as the wave crest at the second depth part;

an inner boss 31 is arranged in the axial middle of the inner wall of the joint body 3, and the inner boss 31 is in sealing abutting connection with the side wall of the wave crest at the innermost side of the plastic corrugated pipe joint 1 through a sealing ring 4.

This embodiment is sealed through the combination of heat shrinkage bush 2 and joint body 3, adopts double seal, and sealing performance is good.

This embodiment adopts 3 places of joint body to adopt interference fit and clearance fit respectively, has both guaranteed sealing performance, has guaranteed the flexibility. The joints are in clearance fit or flexible connection, and the whole system is stressed annularly, so that the whole system has certain impact resistance, flexibility, bending resistance and construction convenience, and the sealing performance of the pipeline system is more reliable in application and easy to popularize and apply.

This embodiment adopts integral joint body 3, compares original structure and need open 3 ~ 4 moulds, this connector only need open 1 mould can, the structure is also simple, with low costs, easily popularizes and applies.

As shown in fig. 2 to 4, in this embodiment, the inner diameter of the sealing ring 4 is in interference fit with the outer diameter of the wave trough of the plastic corrugated pipe joint 1, that is, Φ G is greater than Φ D, so that the sealing ring 4 is tightly sleeved on the wave trough of the outer diameter of the plastic corrugated pipe joint 1; the outer diameter of the sealing ring 4 when the sealing ring is sleeved on the wave trough of the plastic corrugated pipe joint 1 is larger than the outer diameter of the wave crest of the plastic corrugated pipe joint 1, namely the outer diameter of the sealing ring 4 is in interference fit with the small diameter of the inner cone of the joint body 3, phi L is larger than phi F, and phi B is smaller than phi F, the outer diameter of the sealing ring 4 is in interference fit with the inside of the joint body 3, and the inner wall and the outer wall are in interference fit, so that the sealing performance is guaranteed.

As shown in fig. 2 and 3, the inner boss 31 has an inner diameter smaller than the peak of the outer diameter of the plastic bellows tube joint and larger than the valley of the outer diameter of the plastic bellows tube joint 1, i.e., phid < phic < phif, for positioning the insertion of the plastic bellows tube joint 1 and facilitating the positioning of the seal ring 4.

In this embodiment, the sealing ring 4 is made of O-shaped rubber, and has a simple structure, convenience in installation and low cost.

In this embodiment, the number of wave crests sleeved on any one side of the joint body 3 by the plastic corrugated pipe joint 1 is more than 2, so that the sealing performance is better ensured.

In this embodiment, the inner wall of the heat-shrinkable tube 2 is coated with a hot melt adhesive, and the wrapping range after the heat-shrinkable tube 2 is installed needs to be larger than the wave crest of at least one plastic corrugated tube section 1 outside any side single edge of the joint body 3, so that the connection sealing performance is further improved.

As shown in fig. 12, in the present embodiment, the inner boss 31 is configured as a whole ring structure provided on the inner wall of the joint body 3, and has a simple structure, easy processing, and low cost.

In this embodiment, the joint body 3 is a plastic product, and has low cost, good flexibility and convenient installation

Example 3:

the difference between this embodiment and the above embodiment 2 is that the sealing ring 4 is a silica gel sealing ring.

As shown in fig. 5, the inner bosses 31 are configured as axially-disposed inner boss bosses, the number of which is 3 or more, provided on the inner wall of the joint body 3, the inner boss bosses being uniformly provided on the circumferential surface.

Example 4:

the present embodiment is the installation method of embodiment 2, which includes the following steps:

the method comprises the following steps: firstly, sleeving a trough position at one end of a pre-connected plastic corrugated pipe joint 1 at one side with a sealing ring 4;

step two: the plastic corrugated pipe joint 1 sleeved with the sealing ring 4 is integrally inserted into the joint body 3, and the sealing ring 4 is ensured to be inserted into the shoulder position of the inner boss 31 of the joint body 3 until the shoulder of the inner boss 31 abuts against the sealing ring 4;

step three: sleeving a wave trough at one end of the plastic corrugated pipe joint 1 at the other side with a sealing ring 4, and then integrally inserting the sealing ring 4 into the joint body 3 to ensure that the sealing ring 4 is inserted to the position of an inner boss 31 of the joint body 3 until the inner boss 31 abuts against the sealing ring 4;

step four: and sleeving the heat-shrinkable tubing 2 to the outer wall of the connector body 3 and the outer walls of the two pre-connected plastic corrugated pipe joints 1, shrinking the heat-shrinkable tubing 2 by using a tool, and simultaneously wrapping the connector body 3 and the plastic corrugated pipe joints 1 into a whole.

Further, in step 4 of this embodiment, in step four, the wrapping range of the heat-shrinkable tube 2 needs to be larger than the wave crest of at least one plastic corrugated tube joint 1 outside the single edge on any side of the joint body 3, and the wave crest is adopted to perform interference sealing fit, so as to further ensure the sealing performance of the connection.

Example 5:

as shown in fig. 6 and 7, the difference between this embodiment and embodiment 2 is: the seal 4 is replaced by a gland 5. The sealing ring 4 in the embodiment 2 is sleeved at the wave trough position of the plastic corrugated pipe joint 1, and the sealing sleeve 5 in the embodiment 5 is sleeved at the wave crest position of the plastic corrugated pipe joint 1.

As shown in fig. 7 and 8, the sealing sleeve 5 is further characterized in that: the material is rubber or silica gel. The inner diameter of the sealing sleeve 5 is in interference fit with the wave trough of the outer diameter of the plastic corrugated pipe joint 1, namely phi K is less than phi D. The outer diameter phi M of the sealing sleeve 5 when the sealing sleeve is sleeved on the wave crest of the outer diameter of the plastic corrugated pipe joint 1 is larger than the wave crest phi F of the outer diameter of the plastic corrugated pipe joint 1, namely the outer diameter phi M of the sealing sleeve 5 when the sealing sleeve is sleeved on the wave crest of the outer diameter of the plastic corrugated pipe joint 1 is in interference fit with the small diameter phi B of the inner cone of the joint body 3, wherein phi M is larger than phi F, and phi B is smaller than phi M.

The mounting method of the present embodiment is as follows

The method comprises the following steps: firstly, sleeving a sealing sleeve 5 on the wave crest position at one end of a section of plastic corrugated pipe joint 1;

step two: the plastic corrugated pipe joint 1 sleeved with the sealing sleeve 5 is integrally inserted into the joint body 3 until the inner boss 31 of the joint body 3 abuts against the sealing sleeve 5.

Step three: on the other end, the wave crest position at one end of the other section of the plastic corrugated pipe joint 1 is sleeved with a sealing sleeve 5, and then the whole joint body 3 is inserted until an inner boss 31 of the joint body 3 props against the sealing sleeve 5.

Step four: sleeving the heat-shrinkable sleeve 2 to the position of the joint body 3, shrinking the heat-shrinkable sleeve 2 by using a tool, and simultaneously wrapping the joint body 3 and the plastic corrugated pipe joint 1 into a whole. The wrapping range of the heat-shrinkable sleeve 2 is required to be larger than the wave crest of at least one plastic corrugated pipe joint 1 outside the single edge of the joint body 3.

After the installation is completed, the structure is shown in fig. 8.

Example 6:

this embodiment is different from embodiment 2 described above in that:

because the prestressed duct needs to be provided with an exhaust hole and a grouting hole during grouting, the exhaust hole needs to be arranged between the pipelines, and the prestressed duct can be used as the exhaust hole or the grouting hole during grouting. As shown in fig. 9, in example 6, the vent hole (32) is opened in the middle of the joint body 3 mentioned in example 2, that is, the joint body 3 is configured as a circular vent joint structure.

Example 6 is the same as example 4 from step one to step three.

Example 6, step four: the two ends of the circular connector with the vent hole are respectively sleeved with a heat-shrinkable sleeve 2 to the interface position of the circular connector with the vent hole and the plastic corrugated pipe joint 1, the heat-shrinkable sleeve 2 is shrunk by a tool, and the circular connector with the vent hole and the plastic corrugated pipe joint 1 are wrapped into a whole. The wrapping range of the heat-shrinkable sleeve 2 is required to be larger than the wave crest of at least one plastic corrugated pipe joint 1 outside the round single side with the exhaust hole joint.

Example 7:

as shown in fig. 10, the present embodiment is different from the above embodiment 6 in that the plastic bellows tube joint 1 of the present embodiment is configured as a flat plastic bellows tube joint, which has the same principle as that of connecting the circular plastic bellows tube joint 1, except that the joint body 3 is configured as a flat non-exhaust hole joint and a flat exhaust hole joint suitable for the flat plastic bellows tube joint according to the external shape characteristics of the flat plastic bellows tube joint.

The application procedure of the joint body 3 of this embodiment is the same as that of embodiment 6, and as shown in fig. 11, the flat vent-hole-equipped joint of this embodiment is the same as that of embodiment 6.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the technical solutions described in the foregoing embodiments, or some technical features may be equivalently replaced. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (7)

1. The utility model provides a plastics corrugated pipe connects for prestressing force, includes and connects body (3), connect body (3) both ends to be connected its characterized in that with two plastics corrugated pipe tube coupling (1) of pre-connection respectively: the plastic corrugated pipe joint further comprises a heat-shrinkable sleeve (2) and a sealing ring (4), wherein the heat-shrinkable sleeve (2) is coated on the outer circumference of the joint body (3) and extends to coat the outer wall of the plastic corrugated pipe joint (1), the inner wall of the joint body (3) matched with the plastic corrugated pipe joint (1) is set to be a conical structure with the diameter gradually reduced from shallow to deep, the top of the first wave crest (11) of the plastic corrugated pipe joint (1) is connected with the joint body (3) in an interference fit manner, the top of the second wave crest (12) of the plastic corrugated pipe joint (1) is in clearance fit connection with the joint body (3), an inner boss (31) is arranged at the axial middle part of the inner wall of the joint body (3), the inner boss (31) is in sealing and abutting connection with the side wall of the wave crest at the innermost side of the plastic corrugated pipe joint (1) through a sealing ring (4).

2. A prestressed plastic bellows joint as claimed in claim 1, wherein: the inner diameter of the sealing ring (4) is in interference fit with the outer diameter of the trough of the plastic corrugated pipe joint (1), the outer diameter of the sealing ring (4) when the sealing ring is sleeved on the trough of the plastic corrugated pipe joint (1) is larger than the outer diameter of the wave crest of the plastic corrugated pipe joint (1), and the outer diameter of the sealing ring (4) is in interference fit with the inside of the joint body (3).

3. A prestressed plastic bellows joint according to claim 1 or 2, wherein: the sealing ring (4) is one of O-shaped rubber or silica gel sealing ring.

4. A prestressed plastic bellows joint according to claim 1 or 2, wherein: the number of wave crests sleeved on the plastic corrugated pipe joint (1) at any one side of the joint body (3) is more than 2.

5. A prestressed plastic bellows joint according to claim 1 or 2, wherein: the inner wall of the heat-shrinkable sleeve (2) is coated with hot melt adhesive, and the wrapping range after the heat-shrinkable sleeve (2) is installed needs to be larger than the wave crest of at least one plastic corrugated pipe joint (1) outside any side single edge of the joint body (3).

6. A prestressed plastic bellows joint according to claim 1 or 2, wherein: the inner boss (31) is configured as a full ring structure provided on the inner wall of the joint body (3).

7. A prestressed plastic bellows joint according to claim 1 or 2, wherein: the inner bosses (31) are configured as axially arranged inner boss ribs provided on the inner wall of the joint body (3), and the number of the inner boss ribs is 3 or more.

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