Socket-type continuous winding glass fiber reinforced plastic sand-filled pipe

Abstract

The present invention provides a spigot-and-socket type continuously wound glass fiber reinforced plastic sand-filled pipe, which relates to the technical field of glass fiber reinforced plastic sand-filled pipes. It includes a main body, an insert assembly, a sealing ring, and a spigot-and-socket pipe body. The insert assembly is integrally formed at one end of the main body. The insert assembly includes an insert body, and two sealing grooves are provided on the outer circumferential surface of the insert body; the sealing ring is provided in the sealing groove, and the sealing ring is "O"-shaped; the spigot-and-socket pipe body is integrally formed at the other end of the main body, and the spigot-and-socket pipe body is provided with a secondary expansion portion, a sealing fitting portion, and a primary expansion portion in sequence from the outside to the inside. By providing the insert assembly, the spigot-and-socket pipe body, the sealing groove, and the sealing ring, and utilizing the spigot-and-socket connection method of two "O"-shaped sealing rings, a double-layer sealing effect can be provided, which can withstand higher internal water pressure.

Description

Technical Field

[0001] The invention relates to the technical field of glass fiber reinforced plastic sand-filled pipes, in particular to a spigot-and-socket type continuously wound glass fiber reinforced plastic sand-filled pipe. Background Art

[0002] Compared with traditional steel pipes and cast iron pipes, glass fiber reinforced plastic sand-filled pipes have the characteristics of low specific gravity and high strength. Due to the addition of resin mortar in the middle layer of the pipe wall, the rigidity of the pipe is greatly improved, making it suitable for laying in various soil environments and on the seabed.

[0003] Related art, such as patent publication number CN106969211B, describes a high-strength fiberglass reinforced plastic (FRP) sand-filled pipe, comprising a fiber-resin mixed layer on the inner and outer pipe walls. A quartz sand-resin mixed layer, consisting of a mixture of quartz sand and resin, and a fiber-quartz sand mixed layer are disposed between the inner and outer pipe walls. The fiber-quartz sand mixed layer in this patent is formed by mixing quartz sand with glass fibers (1-5 mm in length), which improves the elongation at break of the sand-filled layer.

[0004] Another example is a construction method for connecting a steel pipe and a glass fiber reinforced plastic sand-filled pipe with the announcement number CN108131506B. During the pipe connection construction, multiple steps such as inserting a rubber ring, welding, and grouting are required to complete the pipe connection.

[0005] Another example is a glass fiber reinforced plastic sand-filled jacking pipe based on continuous winding with the announcement number CN220228144U. This patent achieves a sealing effect by inflating the inflation cavity.

[0006] In the prior art, the connection method of the continuously wound glass fiber reinforced plastic sand-filled pipe is usually the socket type, and an elastic rubber ring is placed on the stop seal of the pipe socket to seal the stop seal. After the pipe is buried and backfilled with soil, the connection parts of the pipe body are prone to different deformations, resulting in different forces at different positions of the rubber ring, which affects the sealing performance of the connection and cannot withstand relatively high internal water pressure. Summary of the Invention

[0007] In view of the shortcomings of the existing technology, the present invention provides a socket-type continuously wound glass fiber reinforced plastic sand-filled pipe, which solves the problem of the existing continuously wound glass fiber reinforced plastic sand-filled pipe that the connection is prone to water leakage during connection and cannot withstand high internal water pressure.

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: a socket-type continuously wound glass fiber reinforced plastic sand-filled pipe includes a main body and further includes:

[0009] An insert assembly is integrally formed at one end of the main body, and includes an insert body, wherein two sealing grooves are provided on the outer circumference of the insert body;

[0010] A sealing ring, which is arranged in the sealing groove and is O-shaped;

[0011] A bell-and-spigot pipe body, the bell-and-spigot pipe body being integrally formed at the other end of the main pipe body, the inner wall of the bell-and-spigot pipe body being interference-fitted with the outer circumferential surface of the insert pipe body;

[0012] An end seal assembly, comprising an end seal cavity provided at the end of the inserted pipe body, and an elastic end ring fixedly mounted on the inner side of the socket pipe body, wherein the outer side surface of the end seal cavity is provided with an annular mating opening, and the elastic end ring can be inserted into the end seal cavity through the mating opening;

[0013] The mating assembly, located on the outer surface of the main body near the insert, strengthens the seal on the outside of the main body's socket. The insert assembly, the socket body, the sealing groove, and the sealing ring, combined with the two O-ring socket connections, provide a double-layer seal, preventing water leaks and capable of withstanding high internal water pressures.

[0014] Preferably, the main pipe body, insert pipe body and socket pipe body are integrally formed and solidified by continuously layering resin, continuous fiber and chopped fiber on the circumferential surface of a fixed-length mold using a circumferential winding method, and the main pipe body is also filled with quartz sand.

[0015] Preferably, an accommodating cavity is provided inside the elastic end ring, and a conical cylinder shell is evenly fixedly connected to the inner wall of the accommodating cavity. The conical cylinder shell is in a cone shape with a larger bottom and a smaller top. Openings are provided at the upper and lower ends of the conical cylinder shell, and a liquid inlet is evenly provided on the inner side of the end sealing cavity, and the opening on the lower side is connected to the liquid inlet.

[0016] Preferably, the cone shell is provided with a magnetic part, an elastic contraction part, and a connecting part in sequence from top to bottom, and the magnetic part is composed of two symmetrical parts with opposite magnetic properties.

[0017] Preferably, the shape of the longitudinal section of the accommodating cavity is elliptical, and the maximum value L1 of the difference between the inner and outer diameters of the end sealing cavity is greater than the difference L2 between the inner and outer diameters of the fitting opening.

[0018] Preferably, the socket pipe body is provided with a secondary expansion part, a sealing fitting part, and a primary expansion part in sequence from the outside to the inside; the inner circular surface of the sealing fitting part is interference fit with the outer circular surface of the inserted pipe body, and an annular inner contact surface is provided on the inner side of the connection between the sealing fitting part and the primary expansion part, and the inner contact surface is fixedly connected to the elastic end ring.

[0019] Preferably, the mating component includes a mating tube body, a mating cavity is provided inside the mating tube body, an entrance is provided at the top of the mating cavity, an inner ring surface is provided on the inner side of the mating tube body, and a side surface of the mating tube body close to the insertion tube body is a mating surface.

[0020] Preferably, the mating surface can contact the end surface of the secondary expansion portion, the inner ring surface can contact the outer surface of the insertion tube body, and the mating tube body is made of elastic material.

[0021] The present invention provides a spigot-and-socket continuously wound glass fiber reinforced plastic sand-filled pipe. It has the following beneficial effects:

[0022] 1. The present invention provides a double-layer sealing effect by arranging an insert assembly, a socket pipe body, a sealing groove, and a sealing ring, and utilizes a socket connection method of two "O"-shaped sealing rings, so as to prevent water leakage and withstand higher internal water pressure.

[0023] 2. The present invention provides an end sealing assembly by providing an adaptive end face sealing effect by utilizing a relatively high internal water pressure, and can fully utilize the internal water pressure to ensure good sealing performance of the paving.

[0024] 3. The present invention provides a matching component, which can form a sealing surface on the outside to improve the sealing performance of the paving. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a cross-sectional view of the present invention;

[0026] Figure 2 is a cross-sectional view of an insert assembly of the present invention;

[0027] Figure 3 is a cross-sectional view of a mating component of the present invention;

[0028] Figure 4 is a cross-sectional view of the bell-and-spigot pipe body of the present invention;

[0029] Figure 5 for Figure 1 Enlarged view of point A in the middle;

[0030] Figure 6 for Figure 1 Enlarged view of point B in the middle;

[0031] Figure 7 A perspective view of a third embodiment of the present invention;

[0032] Figure 8 A sectional perspective view of a connection state of a third embodiment of the present invention;

[0033] Figure 9 for Figure 8 Enlarged view of point C in the middle;

[0034] Figure 10 A perspective view of a second embodiment of the present invention;

[0035] Figure 11It is a sectional perspective view of the connection state of the second embodiment of the present invention;

[0036] Figure 12 A perspective view of a first embodiment of the present invention;

[0037] Figure 13 A sectional perspective view of a connection state of the first embodiment of the present invention;

[0038] Figure 14 is a cross-sectional view of the cone shell of the present invention;

[0039] Figure 15 This is a diagram showing the magnetic pole distribution of the magnetic portion of the present invention when viewed from above.

[0040] Among them, 1. main body; 2. insertion assembly; 3. matching assembly; 4. socket pipe body; 5. end seal assembly; 201. insertion pipe body; 202. sealing groove; 301. matching pipe body; 302. entry port; 303. matching cavity; 304. matching surface; 305. inner ring surface; 401. secondary expansion part; 402. sealing matching part; 403. primary expansion part; 404. inner contact surface; 501. liquid inlet; 502. end seal cavity; 503. matching port; 504. elastic end ring; 505. opening; 506. conical shell; 507. accommodating cavity; 5061. magnetic part; 5062. elastic contraction part; 5063. connecting part. DETAILED DESCRIPTION

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0042] Example 1

[0043] like Figures 1-6 、 Figure 12 、 Figure 13 As shown, the embodiment of the present invention provides a spigot-and-socket continuously wound glass fiber reinforced plastic sand-filled pipe, comprising a main body 1, and further comprising:

[0044] Insertion assembly 2, which is integrally formed at one end of main body 1, includes an insertion tube body 201, and two sealing grooves 202 are provided on the outer circumference of the insertion tube body 201;

[0045] refer to Figure 1 、 Figure 2The sealing groove 202 is used to accommodate the sealing ring. The shape of the longitudinal section of the sealing groove 202 can be any one of U-shape, square, circle, ellipse, and trapezoid, and can be selected according to the actual production shape.

[0046] Sealing ring, which is arranged in the sealing groove 202 and is "O" shaped;

[0047] refer to Figure 12 The sealing ring is made of elastic material, such as rubber, which can provide elastic deformation when socketing and provide a good sealing surface. The two sealing rings can provide two layers of sealing protection surfaces. The inner sealing protection surface can meet the sealing needs, and the outer sealing protection surface is used for backup use. After the inner sealing protection surface fails, it provides sealing function again, thereby increasing the service life of the continuously wound glass fiber reinforced plastic sand-filled pipe and ensuring reliable sealing.

[0048] The cross-sectional diameter of the sealing ring has been rigorously calculated and verified in practice, and is set between 17 and 30 mm. This ensures sufficient compressive elastic deformation to adapt to different working conditions, while also providing strong sealing pressure. In actual applications, when the pipe is subjected to internal water pressure, the water pressure will act evenly on the sealing ring, making its contact surface with the socket and the spigot tighter. The greater the pressure, the better the sealing effect. In terms of the ability to bear internal water pressure, tests by professional testing agencies have shown that the leakage rate of this connection method is almost zero when the working pressure is as high as 2.0 MPa, far exceeding that of traditional connection methods. In a high-pressure water supply project in a certain city, this pipe and connection method have been used and have been operating stably for many years at a long-term working pressure of 1.6 MPa without any leakage problems, fully verifying its high internal water pressure bearing capacity and reliability.

[0049] The bell-and-spigot pipe body 4 is integrally formed at the other end of the main pipe body 1. The inner wall of the bell-and-spigot pipe body 4 is interference-fitted with the outer circumferential surface of the insert pipe body 201. The bell-and-spigot pipe body 4 is provided with a secondary expansion portion 401, a sealing fitting portion 402, and a primary expansion portion 403 in sequence from the outside to the inside.

[0050] Specifically, the inner circumference of the sealing fitting portion 402 is interference-fitted with the outer circumference of the insert tube 201;

[0051] refer to Figure 4 The socket pipe body 4 is located on the side away from the insertion component 2, ensuring that the socket pipe body 4 can cooperate with the insertion component 2 to complete the splicing and arrangement operation; the secondary expansion part 401 is used to cooperate with the matching component 3. When used alone, it can provide guidance for the socket operation, facilitate the socket operation, and improve the smoothness of the operation.

[0052] The main body 1, the insert body 201 and the socket body 4 are formed by continuously layering resin, continuous fiber and chopped fiber on the circumferential surface of a fixed-length mold using a hoop winding method and then solidified as a whole. The main body 1 is also filled with quartz sand.

[0053] refer to Figure 12 、 Figure 13 The "continuously wound glass fiber reinforced plastic sand-filled pipe" with a double "O" type rubber sealing ring wound on a fixed-length mold not only has the high strength and high flexibility of the continuously wound glass fiber reinforced plastic sand-filled pipe, but also has the high sealing performance of the fixed-length wound glass fiber reinforced plastic sand-filled pipe with a double "O" type rubber sealing ring connection method; the double "O" type rubber sealing ring can be used to perform a water pressure test on the sealing of the socket interface immediately after the pipe is connected to ensure the sealing safety of the interface; the main body 1, the inserted pipe body 201 and the socket pipe body 4 are molded into one piece at one time and have high ring stiffness, which can ensure that the connection part will not be deformed due to the influence of internal and external loads after installation, and can meet the requirements of normal operation under high pressure; at the same time, due to the flexibility of its socket and double "O" type sealing ring interface, the interface has a large rotation angle, generally about 3 degrees, which can adapt to long-term operation under soft foundation conditions such as beaches. The traditional sleeve connection is limited by its interface rotation angle, which is small and generally needs to be controlled within 0.5-1 degrees. It has very high requirements for foundation settlement, especially for coastal pipelines and soft foundation conditions, which need to be selected with caution. Among them, the pipeline interface rotation angle refers to the angle at which the pipe mouth is allowed to deviate from the original pipeline centerline.

[0054] Example 2

[0055] Reference Figure 11 、 Figure 10 、 Figure 14 、 Figure 15 , which is different from the first embodiment in that:

[0056] The sealing fitting portion 402 and the primary expansion portion 403 are connected to each other at the inner side thereof and an annular inner contact surface 404 is provided;

[0057] refer to Figure 4 The annular inner contact surface 404 can provide a contact area for the end face of the socket connection, forming a sealing surface at the end face.

[0058] The end seal assembly 5 further includes an end seal cavity 502 provided at the end of the insertion tube body 201, and an elastic end ring 504 fixedly mounted on the inner contact surface 404. The outer side of the end seal cavity 502 is provided with an annular mating opening 503, and the elastic end ring 504 can be inserted into the end seal cavity 502 through the mating opening 503.

[0059] refer to Figure 5 、 Figure 6The end sealing cavity 502 is in an annular shape as a whole, and the elastic end ring 504 is in an annular shape as a whole. By inserting the elastic end ring 504 into the end sealing cavity 502, a sealing surface can be formed on the end surface, which can provide a new layer of sealing surface before the double "O" type sealing ring, and is easy to install.

[0060] An accommodating cavity 507 is provided inside the elastic end ring 504. A conical shell 506 is evenly fixedly connected to the inner side of the accommodating cavity 507. The conical shell 506 is larger at the bottom and smaller at the top. Openings 505 are provided at the upper and lower ends of the conical shell 506. Liquid inlets 501 are evenly provided on the inner side of the end sealing cavity 502. The lower openings 505 are connected to the liquid inlet 501.

[0061] The conical shell 506 is provided with a magnetic portion 5061, an elastic contraction portion 5062, and a connecting portion 5063 in order from top to bottom. The magnetic portion 5061 is composed of two symmetrical parts with opposite magnetic properties.

[0062] refer to Figure 14 、 Figure 15 When no water enters the conical shell 506, the elastic contraction part 5062 is in a contracted state. When water enters the sand-filled tube, the water pressure in the sand-filled tube is greater than the pressure in the accommodating chamber 507, and the elastic contraction part 5062 is stretched open by the water, and water enters the accommodating chamber 507 through the conical shell 506; when the pressure in the accommodating chamber 507 is the same as the water pressure in the sand-filled tube, the elastic contraction part 5062 is in a contracted state again. In the contracted state, the two symmetrical parts of the magnetic part 5061 approach and attract each other, so that the inner wall of the elastic contraction part 5062 is fully in contact, so that the water in the accommodating chamber 507 will not be discharged from the conical shell 506. If the water flow in the sand-filled tube disappears, then the pressure in the accommodating chamber 507 is greater than the pressure in the sand-filled tube. This pressure can further increase the fit of the inner wall of the elastic contraction part 5062, thereby preventing the water in the accommodating chamber 507 from flowing out, so that the elastic end ring 504 is always in a filled state, ensuring good sealing at the elastic end ring 504.

[0063] The longitudinal cross-section of the accommodating cavity 507 is elliptical, the end of the elastic end ring 504 away from the inner contact surface 404 is contracted, and the maximum value L1 of the inner and outer diameter difference of the end sealing cavity 502 is greater than the inner and outer diameter difference L2 of the mating opening 503;

[0064] refer to Figure 5 、 Figure 6 、 Figure 9When high-pressure water flow is introduced into the interior, the water flow will enter the accommodating chamber 507 from the liquid inlet 501 through the lower opening 505 and the conical shell 506, causing the elastic end ring 504 to be pressurized and expanded by the high-pressure water flow, thereby providing secondary pressurization to the outer sealing surface of the elastic end ring 504, forming a high-pressure sealing surface, thereby improving the sealing performance of the elastic end ring 504, and the conical shell 506 is larger at the bottom and smaller at the top. Therefore, after the water flow in the sand-filled pipe disappears, the water in the accommodating chamber 507 will exert pressure on the side wall of the conical shell 506, so that the water flow will not flow out of the conical shell 506, thereby always maintaining the good sealing performance of the elastic end ring 504; since the maximum value L1 of the inner and outer diameter difference of the end sealing chamber 502 is greater than the inner and outer diameter difference L2 of the matching opening 503, there is a difference between the two. Therefore, even if there is no water flow in the accommodating chamber 507, the elasticity of the elastic end ring 504 itself can meet the pressure required for sealing, ensuring a good sealing effect.

[0065] Example 3

[0066] Reference Figure 9 、 Figure 8 、 Figure 7 , which is different from the second embodiment in that:

[0067] The mating assembly 3 is further included. The mating assembly 3 is disposed on the outer surface of the main body 1 and adjacent to the insertion tube 201. The mating assembly 3 includes a mating tube 301, a mating cavity 303 is defined within the mating tube 301, an inlet 302 is defined at the top of the mating cavity 303, an inner ring surface 305 is defined on the inner side of the mating tube 301, and a mating surface 304 is defined on the side of the mating tube 301 adjacent to the insertion tube 201. The mating surface 304 can contact the end surface of the secondary expansion portion 401, and the inner ring surface 305 can contact the outer surface of the insertion tube 201. The mating tube 301 is made of an elastic material.

[0068] refer to Figure 8 、 Figure 7 The inlet 302 can be one or more, and the number can be selected according to actual needs. The inlet 302 is located at the top of the matching cavity 303, and liquid or high-strength non-shrinkage grouting material can be easily added to the matching cavity 303 through the inlet 302. The liquid or high-strength non-shrinkage grouting material is used to expand the matching pipe body 301, thereby increasing the sealing pressure between the matching pipe body 301 and the inserted pipe body 201 of the connected sand-filled pipe, and improving the sealing performance of the inserted pipe body 201, thereby providing an additional sealing part on the outside of the double "O" sealing ring to avoid the influence of the external environment on the sealing performance. For example, when laying on the seabed, this method can be selected to use the water pressure of seawater to achieve the effect of pressurized sealing.

[0069] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A spigot-and-socket continuously wound glass fiber reinforced plastic sand-filled pipe, comprising a main body (1), characterized in that: Also includes: An insert assembly (2), the insert assembly (2) being integrally formed at one end of the main pipe (1), the insert assembly (2) comprising an insert pipe (201), and two sealing grooves (202) being provided on the outer circumferential surface of the insert pipe (201); A sealing ring, the sealing ring being arranged in the sealing groove (202), the sealing ring being an "O" shape; A socket pipe body (4), wherein the socket pipe body (4) is integrally formed at the other end of the main pipe body (1), and the inner wall of the socket pipe body (4) is interference-fitted with the outer circumferential surface of the insert pipe body (201); An end sealing assembly (5) is provided, wherein the end sealing assembly (5) comprises an end sealing cavity (502) provided at the end of the inserting tube body (201), and an elastic end ring (504) fixedly installed on the inner side of the socket tube body (4); the outer side surface of the end sealing cavity (502) is provided with an annular fitting opening (503); the elastic end ring (504) can be inserted into the end sealing cavity (502) through the fitting opening (503); the interior of the elastic end ring (504) is provided with an accommodating cavity (507), and the inner side wall of the accommodating cavity (507) is evenly fixedly connected to the conical shell (5 06), the conical shell (506) is in a conical shape with a larger bottom and a smaller top, and openings (505) are provided at both the upper and lower ends of the conical shell (506), and a liquid inlet (501) is evenly provided on the inner side of the end sealing cavity (502), and the opening (505) on the lower side is communicated with the liquid inlet (501), and the conical shell (506) is provided with a magnetic part (5061), an elastic contraction part (5062), and a connecting part (5063) in sequence from top to bottom, and the magnetic part (5061) is composed of two symmetrical parts with opposite magnetic properties; A mating component (3) is provided on the outer surface of the main pipe body (1) and close to the side of the inserted pipe body (201), and is used to strengthen the sealing of the outer side of the socket of the main pipe body (1); the mating component (3) includes a mating pipe body (301), a mating cavity (303) is provided inside the mating pipe body (301), an inlet (302) is provided at the top of the mating cavity (303), an inner ring surface (305) is provided on the inner side of the mating pipe body (301), and a side surface of the mating pipe body (301) close to the inserted pipe body (201) is a mating surface (304).

2. The spigot-and-socket type continuously wound glass fiber reinforced plastic sand-filled pipe according to claim 1, characterized in that: The main pipe body (1), the insert pipe body (201) and the socket pipe body (4) are integrally formed and solidified by continuously layering resin, continuous fibers and chopped fibers on the circumferential surface of a fixed-length mold using a circumferential winding method. The main pipe body (1) is also filled with quartz sand.

3. The socket-and-spigot continuous winding glass fiber reinforced plastic sand-filled pipe according to claim 1, characterized in that: The longitudinal cross-section of the accommodating cavity (507) is elliptical, and the maximum value L1 of the inner and outer diameter difference of the end sealing cavity (502) is greater than the inner and outer diameter difference L2 of the fitting opening (503).

4. The spigot-and-socket continuously wound glass fiber reinforced plastic sand-filled pipe according to claim 1, characterized in that: The socket pipe body (4) is provided with a secondary expansion portion (401), a sealing fitting portion (402), and a primary expansion portion (403) in sequence from the outside to the inside; the inner circular surface of the sealing fitting portion (402) is interference-fitted with the outer circular surface of the insert pipe body (201); an annular inner contact surface (404) is provided on the inner side of the connection between the sealing fitting portion (402) and the primary expansion portion (403); and the inner contact surface (404) is fixedly connected to the elastic end ring (504).

5. The spigot-and-socket continuously wound glass fiber reinforced plastic sand-filled pipe according to claim 4, characterized in that: The mating surface (304) can contact the end surface of the secondary expansion portion (401), and the inner ring surface (305) can contact the outer surface of the insertion tube body (201). The mating tube body (301) is made of elastic material.

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