GRP pipeline connecting method

Abstract

The invention relates to the technical field of GRP pipelines, in particular to a GRP pipeline connection method which comprises the following steps: firstly, judging the connection type of the GRP pipelines, and if the connection is straight pipe section connection of the GRP pipelines, adopting a socket and spigot joint type connection method; if the bent pipe sections of the GRP pipeline are connected, a winding type connecting method is adopted; if the GRP pipeline is connected with the water pump and the valve, a flange connection method is adopted. According to the GRP pipeline connecting method, the construction flexibility is improved, the construction period is shortened, the cost is reduced, meanwhile, the structure of a pipeline system is simplified, the GRP pipeline connecting method is particularly suitable for complex working conditions of large-diameter and large-weight GRP pipelines, and the problems that a traditional single connecting method is long in construction time consumption or large in cost consumption, high in labor cost consumption and the like are solved.

Description

Technical Field

[0001] The invention relates to the technical field of GRP pipes, and in particular to a GRP pipe connection method. Background Art

[0002] GRP pipes (GRP pipes, also known as polyester FRP pipes) have the advantages of excellent corrosion resistance, light weight, high strength, and long service life. They are widely used in petroleum, chemical, water treatment and other fields.

[0003] During the installation and use of GRP pipes, multiple pipe sections need to be connected to avoid environmental obstacles or arrange the pipeline direction according to actual working conditions. However, there is no connection method for large-diameter (diameter exceeding 3000mm) and heavy-weight (GRP pipe deadweight exceeding 20 tons) GRP pipes. If the conventional GRP pipe connection method is directly applied, it will lead to problems such as high GRP pipe construction costs, low pipeline layout flexibility, and difficult pipeline connection. Summary of the invention

[0004] The purpose of the present invention is to overcome the lack of a connection method for large-diameter and heavy-weight GRP pipes in the prior art. If the conventional GRP pipe connection method is directly applied, it will lead to the shortcomings of high GRP pipe construction cost and low flexibility in pipe layout. A GRP pipe connection method is provided.

[0005] In a first aspect, the present invention provides a GRP pipe connection method, firstly determining the GRP pipe connection type, if it is a GRP pipe straight pipe section connection, a socket connection method is adopted; if it is a GRP pipe curved pipe section connection, a winding connection method is adopted; if the GRP pipe is connected to a water pump or a valve, a flange connection method is adopted;

[0006] The socket connection method comprises the following steps:

[0007] A1. Fix the first GRP pipe and the second GRP pipe to be connected with the hand chain hoist, fix the socket sleeve, and use the hand chain hoist to insert one end of the first GRP pipe into the socket sleeve;

[0008] A2. Adjust the elevation of the second GRP pipeline so that the elevation and axis of the second GRP pipeline are consistent with those of the first GRP pipeline;

[0009] A3. Use a hand chain hoist to insert one end of the second GRP pipe into the socket sleeve;

[0010] The winding connection method comprises the following steps:

[0011] B1. Position the first GRP pipe and the second GRP pipe to be connected, and ensure that the elevation and axis centerline of the first GRP pipe and the second GRP pipe to be connected are consistent;

[0012] B2. Prepare the mixed glue and mix the expected amount of resin and curing agent evenly according to the proportion;

[0013] Sealing and polishing: Use the prepared mixed glue to seal the first GRP pipe and the second GRP pipe, and polish the interface surface of the first GRP pipe and the second GRP pipe;

[0014] B3. Coat the polished interface surface with resin and wrap the interface between the first GRP pipe and the second GRP pipe with glass cloth;

[0015] The flange connection method comprises the following steps:

[0016] C1. Flange alignment: Position the third GRP pipe and the flange to ensure that the elevation and axis of the third GRP pipe and the flange are consistent;

[0017] C2. Divide the flange plate of the flange into four areas, which are marked as the first area, the second area, the third area and the fourth area in a clockwise direction, and tighten all bolts in a clockwise direction;

[0018] The first cycle is: first tighten the first bolt of the first area, then tighten the first bolt of the third area, then tighten the first bolt of the fourth area, and finally tighten the first bolt of the second area;

[0019] The second cycle is: first tighten the second bolt of the first area, then tighten the second bolt of the third area, then tighten the second bolt of the fourth area, and finally tighten the second bolt of the second area;

[0020] Tighten all bolts in this cycle.

[0021] The GRP pipe connection method provided by the present invention significantly improves the adaptability and flexibility of pipe connection by judging different GRP pipe connection scenarios (straight pipe sections, curved pipe sections, and connections between pipes and equipment such as water pumps and valves) and using different connection methods (socket-type, winding-type, and flange connection). This method can effectively avoid the problems of poor connection flexibility and high cost of connection efficiency caused by blindly applying a single connection method (for example, in the prior art, pipes that are fully connected by socket-type are easy to connect, but due to their poor rigidity, they have poor strength during pipe layout, especially when encountering complex pipe directions or obstacles, they are difficult to adjust, and additional anchors are required to fix the pipes, resulting in high construction costs. Although fully winding-type connections can provide higher flexibility and sealing, the construction process is time-consuming, especially the winding and curing resin operation steps are relatively complicated, resulting in extended construction period and increased construction costs), thereby ensuring the stability and safety of the pipeline system under various working conditions;

[0022] For the socket-and-spigot connection of the straight pipe section, a hand chain hoist is used so that the pipe can be plugged in under high-precision control, ensuring the firmness and precision of the connection and reducing the error caused by human operation; the hand chain hoist pulls the GRP pipe to be connected for plugging, reducing the dependence on large lifting equipment during the construction process and reducing the cost of equipment rental and operation; the curved pipe section adopts a winding connection, and the sealing treatment of the mixed glue and the winding of the glass cloth further enhances the strength and sealing of the pipe interface, adapting to the stress concentration and deformation requirements that may exist in the curved pipe section; the flange connection method adopts the method of tightening the bolts step by step in different areas, which avoids the displacement and deformation of the flange caused by uneven force on the bolts for large-diameter GRP pipes, and effectively improves the stability and safety of the flange connection;

[0023] In traditional pipeline systems, anchor piers (also called fixed piers or anchor piers) are usually used to withstand the pressure or stress at the pipe joints, especially in curved pipe sections. However, the installation of anchor piers will increase the construction cost and complexity, while taking up more space and reducing the flexibility of pipeline layout. This method uses socket joints in straight pipe sections and wrap-around joints in curved pipe sections, and utilizes the high strength and flexibility of wrap-around joints to cope with the stress requirements of curved pipe sections, thus avoiding the use of anchor piers. This not only simplifies the design and construction of the pipeline system, but also reduces the floor space, improving the economy and operability of the project.

[0024] The GRP pipe connection method provided by the present invention simplifies the structure of the pipe system while improving construction flexibility, shortening construction period and reducing costs. It is particularly suitable for complex working conditions of large-diameter and heavy-weight GRP pipes, and overcomes the problems that the traditional single GRP pipe connection method is difficult to deal with when dealing with large pipes, such as high construction cost, low construction efficiency, unstable connection, and great construction difficulty.

[0025] Preferably, A1 comprises:

[0026] The tensioning ring is fixedly connected to the first GRP pipe and the second GRP pipe, and the hand chain hoist is fixedly connected to the tensioning ring;

[0027] An X-shaped baffle is used to fix the socket sleeve, the X-shaped baffle is abutted against one end of the socket sleeve away from the first GRP pipe, the hook of the hand chain hoist is connected to the X-shaped baffle, and the hand chain hoist is used to insert one end of the first GRP pipe into the socket sleeve.

[0028] The hand chain hoist is connected to the GRP pipe through a tension ring, providing a stable and efficient tension transmission path. The hand chain hoist applies tension evenly to the outer wall of the GRP pipe through the tension ring, making the plug-in operation smoother and more precise. Compared with the tension directly acting on the pipe, the use of the tension ring avoids the concentration of tension on a single part, reducing the deformation or damage of the pipe caused by excessive local force. A buffer layer such as sponge can also be laid between the tension ring and the GRP pipe to avoid damage to the brittle GRP pipe.

[0029] The X-shaped baffle abuts against the end of the socket sleeve away from the pipe, fixing the relative position of the socket sleeve, ensuring that the sleeve remains stationary while the hand chain hoist pulls the pipe. This design not only ensures the efficiency of the splicing operation, but also reduces the need for other tools or manpower during the splicing process, making the whole process easier.

[0030] Preferably, the four ends of the X-shaped baffle are connected to a hand chain hoist, and one end of the first GRP pipe is inserted into the socket sleeve using a four-point pulling method.

[0031] Preferably, A3 includes: fixing a hand chain hoist to the tensioning ring of the first GRP pipe, connecting the hook of the hand chain hoist to the tensioning ring of the second GRP pipe, and inserting one end of the second GRP pipe into the socket sleeve using the hand chain hoist.

[0032] With this setting, the combination of the chain hoist and the tension ring can accurately control the magnitude and direction of the pulling force. The use of the chain hoist makes the pulling force during the pipe splicing process more gentle and controllable, avoiding damage or misalignment of the pipe caused by sudden excessive force. By manually operating the chain hoist, the pulling force can be applied gradually to ensure that the pipe maintains a smooth movement when inserted into the socket sleeve, thereby greatly improving the accuracy and reliability of the splicing.

[0033] Preferably, before A1, the GRP pipe and the socket to be connected are inspected and the sealing ring is installed, including:

[0034] Check that the socket of the socket-and-spigot and the socket of the GRP pipe to be connected are smooth and have no protrusions; check that there is no stratification in the sealing ring groove of the socket-and-spigot; apply lubricant on the surface of the sealing ring, install the sealing ring into the sealing ring groove of the socket-and-spigot, and install four sealing rings on the same socket-and-spigot. The side of the sealing ring that contacts the GRP pipe to be connected has serrations, and the direction of the serrations is opposite to the direction in which the GRP pipe to be connected is inserted into the socket-and-spigot.

[0035] Before step A1, check the GRP pipe and socket to be connected and install the sealing ring to ensure the flatness of the connection surface, thereby improving the sealing effect. Check the flatness of the socket and GRP pipe socket to avoid poor sealing or damage to the sealing ring due to uneven surface, ensure smooth connection of the interface and reduce wear of the sealing ring. Check the sealing ring groove of the socket to prevent the groove from stratifying and causing displacement or damage of the sealing ring to ensure sealing stability. Applying lubricant on the surface of the sealing ring can reduce installation resistance, prevent the sealing ring from being worn or deformed during installation, and improve the overall sealing performance. The multiple sealing design of four sealing rings enhances the reliability of the interface and can effectively prevent the risk of leakage caused by wear of a single sealing ring, especially in the use of large-diameter pipes. In addition, the serrated structure of the sealing ring fits tightly with the contact surface of the pipe, further improving the sealing effect. Its directional design prevents backflow and leakage, and enhances the sealing and stability of the pipeline system under high pressure.

[0036] Preferably, B2 comprises:

[0037] Prepare the mixed glue. When the ambient temperature is 33±3 degrees Celsius, the ratio of resin to curing agent is 75:1. When the ambient temperature is 40±3 degrees Celsius, the ratio of resin to curing agent is 125:1. The curing agent is triethylenetetramine. Mix the expected amount of resin and curing agent in proportion and evenly; Sealing and polishing: polish and chamfer the interface between the first GRP pipe and the second GRP pipe, and seal the first GRP pipe and the second GRP pipe with the prepared mixed glue; remove excess mixed glue after the mixed glue is cured; polish the interface surface of the first GRP pipe and the second GRP pipe.

[0038] Adjusting the ratio of resin to curing agent according to the ambient temperature can adapt to the construction requirements under different temperature conditions and ensure the curing effect of the mixed glue. When the ambient temperature is low (33±3 degrees Celsius), the curing process is accelerated by increasing the proportion of curing agent to avoid long curing time or insufficient colloid strength caused by low temperature; under higher temperature conditions (40±3 degrees Celsius), the operating time of the mixed glue is ensured by appropriately increasing the proportion of resin to prevent excessive curing from affecting the flexibility of operation; the curing agent triethylenetetramine can better cure the resin; sealing grinding and chamfering can ensure that the interface between the first GRP pipe and the second GRP pipe is smoother, which is conducive to the uniform coating of the mixed glue, reducing the stress concentration of the interface, and preventing cracks or water leakage in the stress concentration area; grinding the interface surface can ensure a close fit with the pipe when the glass cloth is wrapped in the next step, and enhance the overall strength and durability of the wrapped connection.

[0039] Preferably, B3 comprises:

[0040] Resin is coated on the polished interface surface, and glass cloth is used to wrap the interface between the first GRP pipe and the second GRP pipe. The resin coating and glass cloth wrapping are performed alternately. During the wrapping process, a pressure roller is used to continuously roll the glass cloth to drive out the bubbles inside.

[0041] The method of alternating between coating resin and winding glass cloth can improve wrapping efficiency while ensuring that each layer of resin and glass cloth is evenly covered, thereby optimizing the overall strength and durability of the connection area; using a pressure roller to continuously roll the glass cloth during the wrapping process can effectively drive out internal bubbles and prevent bubbles from forming weaknesses or defects after the resin is cured.

[0042] Preferably, before B1, the pipe ends of the first GRP pipe and the second GRP pipe to be connected are cleaned and dried, and the first GRP pipe and the second GRP pipe to be connected are cut and blanked.

[0043] With this setup, dirt, grease, dust and other impurities on the pipe surface can be removed by cleaning and drying the pipe ends to ensure that there is no moisture on the pipe surface. These impurities will affect the bonding effect of the resin and the quality of the connection. A clean connection surface can ensure good contact between the resin and the pipe material, thereby improving the bonding strength. The winding connection method is suitable for connecting GRP pipe elbows. The pipe to be connected is cut and blanked to ensure that the pipe end meets the connection requirements.

[0044] Preferably, in C2, a torque wrench is used to tighten the bolts in increments of 6N / m-8N / m, and the torque value of the bolts gradually reaches 35N / m.

[0045] Using a torque wrench to gradually tighten the bolts in increments of 6N / m to 8N / m, and finally reaching a setting of 35N / m ensures uniform force application, reduces the risk of uneven connection surfaces or local uneven force due to excessive torque applied at one time, and thus enhances the sealing performance of the flange connection. In addition, this gradual tightening method effectively prevents material damage and reduces the risk of fatigue or fracture of the flange surface and bolt materials caused by excessive instantaneous torque. By precisely controlling the applied torque, construction personnel can ensure close contact between the flange surfaces, improve the reliability and durability of the connection, ensure the safety of the pipeline system under working conditions, and reduce the need for subsequent maintenance.

[0046] Preferably, the flange is cleaned before C1, and the O-ring is installed in the flange groove of the flange.

[0047] The installation of O-rings ensures the sealing performance of flange connections, improves the reliability of connections, and reduces the risk of leakage caused by poor connections. By ensuring the cleanliness and good condition of flanges and O-rings, the safety and efficiency of the pipeline system during operation are ensured.

[0048] Compared with the prior art, the present invention has the following beneficial effects:

[0049] 1. The GRP pipe connection method provided by the present invention significantly improves the adaptability and flexibility of pipe connection by judging different GRP pipe connection scenarios (straight pipe sections, curved pipe sections, and connections between pipes and equipment such as water pumps and valves) and using different connection methods (socket-type, winding-type, and flange connection). This method can effectively avoid the problems of poor connection flexibility and high cost of connection efficiency caused by blindly applying a single connection method (for example, in the prior art, pipes that are fully connected by socket-type are easy to connect, but due to their poor rigidity, they have poor flexibility in pipe layout, especially when encountering complex pipe directions or obstacles, adjustments are difficult, and additional anchors are required to fix the pipes, resulting in high construction costs. Although fully winding-type connections can provide higher flexibility and sealing, the construction process is time-consuming, especially the winding and curing resin operation steps are relatively complicated, resulting in extended construction period and increased construction costs), thereby ensuring the stability and safety of the pipeline system under various working conditions;

[0050] 2. The GRP pipe connection method provided by the present invention uses a hand chain hoist for the socket-type connection of the straight pipe section, so that the pipe can be plugged in under high-precision control, ensuring the firmness and precision of the connection and reducing the error caused by human operation; the hand chain hoist pulls the GRP pipe to be connected for plugging, reducing the dependence on large-scale lifting equipment during the construction process and reducing the cost of equipment rental and operation; the curved pipe section adopts a winding connection, and the strength and sealing of the pipe interface are further enhanced through the sealing treatment of the mixed glue and the winding of the glass fiber cloth, which adapts to the stress concentration and deformation requirements that may exist in the curved pipe section; the flange connection method adopts the method of tightening the bolts step by step in different areas, which avoids the displacement and deformation of the flange caused by uneven force on the bolts for large-diameter GRP pipes, and effectively improves the stability and safety of the flange connection;

[0051] 3. In traditional pipeline systems, anchor piers (also called fixed piers or anchor piers) are usually used to withstand the pressure or stress at the pipeline connection, especially in the curved pipe section. However, the setting of anchor piers will increase the construction cost and complexity, while taking up more space and reducing the flexibility of pipeline layout. This method uses socket joints in straight pipe sections and wrap-around joints in curved pipe sections, and utilizes the high strength and flexibility of wrap-around joints to cope with the stress requirements of curved pipe sections, thus avoiding the use of anchor piers. This not only simplifies the design and construction of the pipeline system, but also reduces the floor space, improving the economy and operability of the project.

[0052] 4. The GRP pipe connection method provided by the present invention simplifies the structure of the pipe system while improving construction flexibility, shortening construction period and reducing costs. It is particularly suitable for complex working conditions of large-diameter and heavy-weight GRP pipes, and overcomes the problems of traditional single connection methods such as long construction time or high cost consumption and high labor costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 A flow chart of the GRP pipeline connection method provided by the present invention;

[0054] Figure 2 This is a flow chart of the method for connecting the GRP pipe in a straight pipe section in Example 1;

[0055] Figure 3 This is a flow chart of the method for connecting the GRP pipe at the bend section in Example 2;

[0056] Figure 4 This is a flow chart of the method for connecting the GRP pipe, water pump and valve in Example 3;

[0057] Figure 5 It is a schematic diagram of the connection between the first GRP pipe and the socket sleeve;

[0058] Figure 6It is a schematic diagram of the socket sleeve structure;

[0059] Figure 7 It is a cross-sectional view of the socket sleeve;

[0060] Figure 8 It is a schematic diagram of the connection between the first GRP pipe, the second GRP pipe and the socket sleeve;

[0061] Fig. 9 This is a schematic diagram of sealing and grinding the first GRP pipe and the second GRP pipe;

[0062] Fig.10 Schematic diagram of wrapping glass cloth around the interface between the first GRP pipe and the second GRP pipe;

[0063] Fig.11 This is a schematic diagram of the third GRP pipe connected to the valve through a flange;

[0064] Fig.12 It is a partial cross-sectional view of the connection between the third GRP pipe and the flange;

[0065] Fig.13 Schematic diagram of the tightening sequence of flange bolts.

[0066] Markings in the figure:

[0067] 11-first GRP pipe, 12-second GRP pipe, 13-third GRP pipe, 14-tensioning ring, 15-X-shaped baffle, 2-socket sleeve, 21-sealing ring, 3-hand chain hoist, 4-flange, 41-first area, 42-second area, 43-third area, 44-fourth area, 45-O-ring, 5-glass cloth, 6-valve. DETAILED DESCRIPTION

[0068] The present invention is further described in detail below in conjunction with specific embodiments. However, this should not be understood as the scope of the above subject matter of the present invention being limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0069] Unless otherwise specified, in the description of the specific embodiments of the present invention, the terms indicating the orientation or position relationship such as "up", "down", "left", "right", "center", "inside", "outside", etc. are all based on the expression of the orientation or position relationship shown in the drawings, or are the orientation or position relationship when the invented product / equipment / device is usually used. These terms of orientation or position relationship are only for the convenience of describing the scheme of the present invention or simplifying the description in the specific embodiments, so as to facilitate the technicians to quickly understand the scheme, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific position relationship, and therefore cannot be understood as a limitation on the present invention.

[0070] In addition, if the terms "horizontal", "vertical", "overhanging", "parallel" and the like appear, it does not mean that the corresponding devices / components / elements are required to be absolutely horizontal or vertical or overhanging or parallel, but may be slightly tilted or have deviations. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but may be slightly tilted. Alternatively, it can be simplified to mean that the corresponding devices / components / elements are set in directions such as "horizontal", "vertical", "overhanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably an error / deviation within ±8%, more preferably an error / deviation within ±6%, more preferably an error / deviation within ±5%, and more preferably an error / deviation within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its role in the scheme of the present invention.

[0071] In addition, the expressions “first”, “second”, “third”, etc., which appear in the terms, are merely used to distinguish the description of the same or similar components and should not be understood as emphasizing or implying the relative importance of specific components.

[0072] In addition, in the description of the embodiments of the present invention, "several", "plurality" and "a number" represent at least 2. It can be any number such as 2, 3, 4, 5, 6, 7, 8, 9, and even more than 9.

[0073] In addition, in the description of the technical solution of the present invention, unless otherwise clearly specified / defined / restricted, the terms "set", "install", "connect", "connected", "provided with", "laid", and "arranged" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, and can be welding, riveting, bolting, threading, and other commonly used connection means in the field. This connection can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the internal connection of two elements.

[0074] Example 1

[0075] like Figure 1-Figure 13 As shown, this embodiment provides a GRP pipe connection method. First, the GRP pipe connection type is determined. If it is a GRP pipe straight section connection, a socket connection method is adopted; if it is a GRP pipe curved section connection, a winding connection method is adopted; if the GRP pipe is connected to a water pump or a valve, a flange connection method is adopted;

[0076] Specifically, Figure 2 As shown, the socket connection method includes the following steps:

[0077] A1. The first GRP pipe 11 and the second GRP pipe 12 to be connected are fixedly connected to the hand chain hoist 3. Specifically, Figure 5 As shown, the tension ring 14 can be fixedly connected to the first GRP pipe 11 and the second GRP pipe 12, and the hand chain hoist 3 is fixedly connected to the tension ring 14; the tension ring 14 can be specifically a clamp, which symmetrically clamps the GRP pipe from both sides, and the tension ring 14 is provided with symmetrical force points to facilitate the installation of the hand chain hoist 3. For example, the tension ring 14 can be symmetrically provided with two, four, or six force points. Sponge, thick cotton cloth or rubber can be filled between the tension ring 14 and the first GRP pipe 11 and the second GRP pipe 12 for buffering and increasing the friction between the tension ring 14 and the GRP pipe.

[0078] Fix the socket sleeve 2, and insert one end of the first GRP pipe 11 into the socket sleeve 2 using the hand chain hoist 3; specifically, an X-shaped baffle 15 can be used to fix the socket sleeve 2, and the X-shaped baffle 15 can be welded by two cross-shaped steel sections; the X-shaped baffle 15 abuts against the end of the socket sleeve 2 away from the first GRP pipe 11 (for example Figure 5 The first GRP pipe 11 is inserted into the socket sleeve 2 from right to left, and the X-shaped baffle 15 is located at the left end of the socket sleeve 2). The hook of the hand winch 3 is connected to the X-shaped baffle 15, and the hand winch 3 is used to insert one end of the first GRP pipe 11 into the socket sleeve 2.

[0079] The hand chain hoist 3 is connected to the GRP pipe through the tension ring 14, providing a stable and efficient tension transmission path. The hand chain hoist 3 applies the tension evenly to the outer wall of the GRP pipe through the tension ring 14, making the plug-in operation smoother and more precise. Compared with the tension directly acting on the pipe, the use of the tension ring 14 avoids the concentration of tension on a single part, reducing the deformation or damage of the pipe caused by excessive local force. A buffer layer such as sponge can also be laid between the tension ring 14 and the GRP pipe to avoid damage to the brittle GRP pipe.

[0080] The X-shaped baffle 15 abuts against the end of the socket sleeve 2 away from the pipe, fixing the relative position of the socket sleeve 2, ensuring that the sleeve remains stationary while the hand chain hoist 3 pulls the pipe. This design not only ensures the efficiency of the plug-in operation, but also reduces the need for other tools or manpower during the plug-in process, making the entire process more convenient.

[0081] Furthermore, the four ends of the X-shaped baffle 15 are connected to the hand winch 3, and one end of the first GRP pipe 11 is inserted into the socket sleeve 2 using the four-point pulling method. That is, in the socket connection process of the GRP pipe, the four-point pulling method connects the cables of the hand winch 3 to the four ends of the X-shaped baffle 15 respectively, and uses four points to apply force to the socket sleeve 2 at the same time, so as to evenly insert the GRP pipe into the sleeve.

[0082] A2. Before inserting the second GRP pipe 12, adjust the elevation of the second GRP pipe 12 so that the elevation and axis of the second GRP pipe 12 are consistent with those of the first GRP pipe 11, and ensure that the two pipes are completely aligned and leveled to avoid extrusion damage to the sealing ring in the socket sleeve 2;

[0083] A3. The hand chain hoist 3 is fixedly connected to the tensioning ring 14 of the first GRP pipe 11 , the hook of the hand chain hoist 3 is connected to the tensioning ring 14 of the second GRP pipe 12 , and one end of the second GRP pipe 12 is inserted into the socket sleeve 2 using the hand chain hoist 3 .

[0084] The combined use of the hand chain hoist 3 and the tension ring 14 can accurately control the magnitude and direction of the pulling force. The use of the hand chain hoist 3 makes the pulling force applied during the pipe splicing process more gentle and controllable, avoiding damage or dislocation of the pipe caused by sudden excessive force. By manually operating the hand chain hoist 3, the pulling force can be gradually applied to ensure that the pipe maintains a smooth movement when inserted into the socket sleeve 2, thereby greatly improving the accuracy and reliability of the splicing.

[0085] Further, such as Figure 2 As shown, before step A1, the GRP pipe and the socket sleeve 2 to be connected can be inspected and the sealing ring 21 can be installed, including: checking that the socket of the socket sleeve 2 and the GRP pipe spigot to be connected are smooth and have no protrusions; checking that the sealing ring groove of the socket sleeve 2 has no stratification phenomenon; the sealing ring 21 has no defects such as cracks, bubbles, and impurities; using a brush or other tools to clean the socket, spigot and socket sleeve 2 of the docking pipe; applying lubricant on the surface of the sealing ring 21, and using uniform pressure to install the sealing ring 21 into the sealing ring groove of the socket sleeve 2, during which the socket sleeve 2 and the sealing ring 21 should be kept clean and free of sand particles.

[0086] like Figure 6 , Figure 7 As shown, four sealing rings 21 are installed on the same socket sleeve 2. The side of the sealing ring 21 that contacts the GRP pipe to be connected is serrated. The direction of the serrated is opposite to the direction in which the GRP pipe to be connected is inserted into the socket sleeve 2. Specifically, for example Figure 7 As shown, Figure 7 The pipe on the left side of the middle bell sleeve 2 is inserted into the bell sleeve 2 from left to right. Figure 7The serrations of the two sealing rings 21 on the left side are both oriented to the left. Figure 7 The pipe on the right side of the middle bell sleeve 2 is inserted into the bell sleeve 2 from right to left. Figure 7 The serrations of the two sealing rings 21 on the middle right side are both oriented toward the right side.

[0087] Before step A1, the GRP pipe and the socket sleeve 2 to be connected are checked and the sealing ring 21 is installed to ensure the flatness of the connection surface, thereby improving the sealing effect. Check the flatness of the socket sleeve 2 and the GRP pipe socket to avoid poor sealing or damage to the sealing ring 21 due to uneven surfaces, ensure smooth insertion of the interface, and reduce wear of the sealing ring 21. Check the groove of the sealing ring 21 of the socket sleeve 2 to prevent the groove from being delaminated and causing displacement or damage to the sealing ring 21, and ensure the stability of the seal. Coating the surface of the sealing ring 21 with lubricant can reduce the installation resistance, prevent the sealing ring 21 from being worn or deformed during the installation process, and improve the overall sealing performance. The multiple sealing design of the four sealing rings 21 enhances the reliability of the interface and can effectively prevent the risk of leakage caused by wear of a single sealing ring 21, especially in the use of large-diameter pipes. In addition, the serrated structure of the sealing ring 21 fits tightly with the contact surface of the pipe, further improving the sealing effect. Its directional design prevents backflow and leakage, and enhances the sealing and stability of the pipeline system under high pressure.

[0088] After step A3, a review may be performed to recheck whether the first GRP pipe 11, the second GRP pipe 12, and the socket sleeve 2 are tightly connected to ensure that there is no leakage.

[0089] like Fig. 9 , Fig.10 As shown, the winding connection method comprises the following steps:

[0090] B1. Align and level the pipes, position the first GRP pipe 11 and the second GRP pipe 12 to be connected, make the gap between the two GRP pipes to be connected as small as possible, and the maximum allowable gap between the first GRP pipe 11 and the second GRP pipe 12 in the curved pipe section is ≤15mm, and ensure that the elevation and axis centerline of the first GRP pipe 11 and the second GRP pipe 12 to be connected are consistent;

[0091] B2. Prepare the mixed glue and mix the expected amount of resin and curing agent evenly according to the proportion;

[0092] Sealing and polishing: Use the prepared mixed glue to seal the first GRP pipe 11 and the second GRP pipe 12, and polish the interface surface of the first GRP pipe 11 and the second GRP pipe 12;

[0093] B3. Coat the polished interface surface with resin, and wrap the interface of the first GRP pipe 11 and the second GRP pipe 12 with glass cloth 5;

[0094] like Figure 11-13 As shown, the flange connection method comprises the following steps:

[0095] C1. Flange alignment: Position the third GRP pipe 13 and flange 4 to ensure that the elevation and axis of the third GRP pipe 13 and flange 4 are consistent;

[0096] C2. Fig.13 As shown, the flange plate of the flange 4 is divided into four areas, which are marked as the first area 41, the second area 42, the third area 43 and the fourth area 44 in a clockwise direction, and all bolts are tightened cyclically in a clockwise direction;

[0097] The first cycle is: first tighten the first bolt of the first area 41 (for example Fig.13 Then tighten the first bolt of the third area 43 (for example Fig.13 2 in the fourth area), and then tighten the first bolt of the fourth area 44 (for example Fig.13 3 in the figure), and finally tighten the first bolt in the second area (for example Fig.13 Bolt No. 4 in the figure);

[0098] The second cycle is: first tighten the second bolt of the first area 41 (for example Fig.13 5 in the figure), and then tighten the second bolt in the third area 43 (e.g. Fig.13 6 in the fourth area), and then tighten the second bolt of the fourth area 44 (e.g. Fig.13 Finally, tighten the second bolt in the second area (for example Fig.13 Tighten all the bolts in this way.

[0099] Fig.11 The third GRP pipe 13 is connected to the valve 6 via the flange 4 as an example. Fig.13 The flange is shown with 52 bolts. Fig.13 Just tighten the bolts in the order of the numbers marked on the bolts.

[0100] The GRP pipe connection method provided in this embodiment significantly improves the adaptability and flexibility of pipe connection by judging different GRP pipe connection scenarios (straight pipe sections, curved pipe sections, and connections between pipes and equipment such as water pumps and valves) and using different connection methods (socket-type, winding type, and flange 4 connection). This method can effectively avoid the problems of poor connection flexibility and high cost of connection efficiency caused by blindly applying a single connection method (for example, in the prior art, pipes that are fully connected by socket-type are easy to connect, but due to their poor rigidity, they have poor strength during pipe layout, especially when encountering complex pipe directions or obstacles, adjustments are difficult, and additional anchors are required to fix the pipes, resulting in high construction costs. Although fully winding connections can provide higher flexibility and sealing, the construction process is time-consuming, especially the winding and curing resin operation steps are more complicated, resulting in extended construction period and increased construction costs), ensuring the stability and safety of the pipeline system under various working conditions;

[0101] For the socket-and-spigot connection of the straight pipe section, the hand chain hoist 3 is used so that the pipe can be plugged in under high-precision control, ensuring the firmness and precision of the connection and reducing the error caused by human operation; the hand chain hoist 3 pulls the GRP pipe to be connected for plugging, reducing the dependence on large lifting equipment during the construction process and reducing the cost of equipment rental and operation;

[0102] The curved pipe section adopts winding connection, and the strength and sealing of the pipe interface are further enhanced through the sealing treatment of the mixed glue and the winding of the glass cloth 5, which adapts to the stress concentration and deformation requirements that may exist in the curved pipe section;

[0103] The flange 4 connection method adopts the method of tightening bolts in a step-by-step cycle in different areas. A special bolt tightening sequence is used for large-diameter GRP pipes to avoid the displacement and deformation of the flange 4 caused by uneven bolt force, effectively improving the stability and safety of the flange 4 connection;

[0104] In traditional pipeline systems, anchor piers (also called fixed piers or anchor piers) are usually used to withstand the pressure or stress at the pipe joints, especially in curved pipe sections. However, the installation of anchor piers will increase the construction cost and complexity, while taking up more space and reducing the flexibility of pipeline layout. This method uses socket joints in straight pipe sections and wrap-around joints in curved pipe sections, and utilizes the high strength and flexibility of wrap-around joints to cope with the stress requirements of curved pipe sections, thus avoiding the use of anchor piers. This not only simplifies the design and construction of the pipeline system, but also reduces the floor space, improving the economy and operability of the project.

[0105] The GRP pipe connection method provided by the present invention simplifies the structure of the pipe system while improving construction flexibility, shortening construction period and reducing costs. It is particularly suitable for complex working conditions of large-diameter and heavy-weight GRP pipes, and overcomes the problems that the traditional single GRP pipe connection method is difficult to deal with when dealing with large pipes, such as high construction cost, low construction efficiency, unstable connection, and great construction difficulty.

[0106] Example 2

[0107] On the basis of Example 1, step B2 in this embodiment includes: preparing a mixed glue, the solidification time of the mixed glue is preferably between 20 minutes and 40 minutes, when the ambient temperature is 33±3 degrees Celsius, the ratio of the resin to the curing agent is 75:1, when the ambient temperature is 40±3 degrees Celsius, the ratio of the resin to the curing agent is 125:1, specifically, the curing agent can be triethylenetetramine (TETA), and the expected amount of resin and curing agent are stirred evenly according to the proportion; as shown in Table 1, the ratio of the resin at different temperatures and the solidification time test data.

[0108] Table 1 Resin ratio and solidification time test at different temperatures

[0109]

[0110] Sealing polishing: Fig. 9 As shown, a polishing machine can be used to grind and chamfer the interface of the first GRP pipe 11 and the second GRP pipe 12, and the first GRP pipe 11 and the second GRP pipe 12 are sealed with the prepared mixed glue (for example Fig. 9 The upper interface of the first GRP pipe 11 and the second GRP pipe 12 is painted black); after the mixed glue is cured, the excess mixed glue is removed until the surface is flat; a polishing machine can be used to polish the portion to be wound on the interface surface of the first GRP pipe 11 and the second GRP pipe 12.

[0111] Adjusting the ratio of resin to curing agent according to the ambient temperature can adapt to the construction requirements under different temperature conditions and ensure the curing effect of the mixed glue. When the ambient temperature is low (33±3 degrees Celsius), the curing process is accelerated by increasing the proportion of curing agent to avoid long curing time or insufficient colloid strength caused by low temperature; under higher temperature conditions (40±3 degrees Celsius), the resin ratio is appropriately increased to ensure the operability time of the mixed glue and prevent too fast curing from affecting the flexibility of operation;

[0112] Sealing grinding and chamfering can ensure that the interface between the first GRP pipe and the second GRP pipe is smoother, which is conducive to the uniform coating of the mixed glue, reduces the stress concentration on the interface, and prevents cracks or water leakage in the stress concentration area;

[0113] Polishing the interface surface can ensure a close fit between the pipe and the glass cloth when it is wrapped in the next step, thus enhancing the overall strength and durability of the wrapped connection.

[0114] Furthermore, B3 includes: ensuring that both sides of the GRP pipe interface are flat before wrapping, coating the polished interface surface with resin, wrapping the interface of the first GRP pipe 11 and the second GRP pipe 12 with glass cloth, coating the resin and wrapping the glass cloth alternately, and using a pressure roller to continuously roll the glass cloth during wrapping to drive out the bubbles inside, ensuring that the glass cloth is completely soaked with resin.

[0115] The method of alternately coating resin and winding glass cloth 5 can improve the wrapping efficiency while ensuring that each layer of resin and glass cloth 5 is evenly covered, thereby optimizing the overall strength and durability of the connection area; using a pressure roller to continuously roll the glass cloth 5 during the wrapping process can effectively drive out internal bubbles and prevent bubbles from forming weaknesses or defects after the resin is cured.

[0116] like Figure 3 As shown, before starting step B1, the ends of the first GRP pipe 11 and the second GRP pipe 12 to be connected can be cleaned and dried. For example, if the pipe has been exposed to grease, etc., a rag dipped in dichloromethane is required to remove all dust, oil and moisture; if the joint is too wet, it is necessary to heat the joint after wiping it dry; during rain or sandstorms, a rainproof cloth is required to be set up in the construction area to prevent rain and prevent the joint from being too wet. Cut the first GRP pipe 11 and the second GRP pipe 12 to be connected to ensure that the pipe ports meet the connection requirements.

[0117] Furthermore, after step B3, the gel can be left to stand: before the mixed glue is completely solidified, a dedicated person is assigned to supervise and timely add glue. Where glue is accumulated, use a brush to spread the glue evenly until it gels. After the seal is completely solidified, check the seal quality to ensure that there are no defects such as bubbles and cracks.

[0118] Example 3

[0119] On the basis of Example 1, in step C2 of this embodiment, a torque wrench can be further used to tighten the bolts in increments of 6N / m-8N / m, so that the torque value of the bolts gradually reaches 35N / m. It is better to use a torque wrench to tighten the bolts in increments of 7N / m.

[0120] Using a torque wrench to gradually tighten the bolts in increments of 6N / m to 8N / m, and finally reaching a setting of 35N / m ensures uniform force application, reduces the risk of uneven connection surfaces or local uneven force due to excessive torque applied at one time, and thus enhances the sealing performance of the flange 4 connection. In addition, this gradual tightening method effectively prevents material damage and reduces the risk of fatigue or fracture of the flange 4 surfaces and bolt materials caused by excessive instantaneous torque. By precisely controlling the applied torque, construction personnel can ensure close contact between the 4 flange surfaces, improve the reliability and durability of the connection, ensure the safety of the pipeline system under working conditions, and reduce the need for subsequent maintenance.

[0121] Further, such as Figure 4 As shown, the flange 4 may be cleaned before step C1, and Fig.12 As shown, the O-ring 45 is installed in the flange groove of the flange 4. The installation of the O-ring 45 ensures the sealing performance of the flange 4 connection, improves the reliability of the connection, and reduces the risk of leakage caused by poor connection. By ensuring that the flange 4 and the O-ring 45 are clean and in good condition, the safety and efficiency of the pipeline system during operation are ensured.

[0122] Further, after step C2, the torque of the flange 4 can be checked again. The bolt torque can be checked again after one hour to determine whether the torque value has changed. If there is a change, it is necessary to adjust to reach the previous maximum torque value.

[0123] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A GRP pipe connection method, characterized in that: First, determine the GRP pipe connection type. If it is a GRP pipe straight section connection, use the socket connection method; if it is a GRP pipe curved section connection, use the winding connection method; If the GRP pipe is connected to the water pump and valve, the flange connection method is used; The socket connection method comprises the following steps: A1. The first GRP pipe (11) and the second GRP pipe (12) to be connected are fixedly connected with the hand chain hoist (3), the socket sleeve (2) is fixed, and one end of the first GRP pipe (11) is inserted into the socket sleeve (2) using the hand chain hoist (3); A2. Adjust the elevation of the second GRP pipe (12) so that the elevation and axis of the second GRP pipe (12) are consistent with those of the first GRP pipe (11); A3. Use a hand chain hoist (3) to insert one end of the second GRP pipe (12) into the socket sleeve (2); The winding connection method comprises the following steps: B1. Positioning the first GRP pipe (11) and the second GRP pipe (12) to be connected, ensuring that the elevation and axis line of the first GRP pipe (11) and the second GRP pipe (12) to be connected are consistent; B2. Prepare the mixed glue and mix the expected amount of resin and curing agent evenly according to the proportion; Sealing and polishing: using the prepared mixed glue to seal the first GRP pipe (11) and the second GRP pipe (12), and polishing the interface surface of the first GRP pipe (11) and the second GRP pipe (12); B3. Coating the polished interface surface with resin, and wrapping the interface between the first GRP pipe (11) and the second GRP pipe (12) with glass cloth (5); The flange connection method comprises the following steps: C1. Flange alignment: Position the third GRP pipe (13) and the flange (4) to ensure that the elevation and axis of the third GRP pipe (13) and the flange (4) are consistent; C2. Divide the flange plate of flange (4) into four areas, which are marked as the first area (41), the second area (42), the third area (43) and the fourth area (44) in a clockwise direction, and tighten all bolts in a clockwise direction; The first cycle is: first tighten the first bolt of the first area (41), then tighten the first bolt of the third area (43), then tighten the first bolt of the fourth area (44), and finally tighten the first bolt of the second area; The second cycle is: first tighten the second bolt of the first area (41), then tighten the second bolt of the third area (43), then tighten the second bolt of the fourth area (44), and finally tighten the second bolt of the second area; Tighten all bolts in this cycle.

2. A GRP pipe connection method according to claim 1, characterized in that A1 include: The tensioning ring (14) is fixedly connected to the first GRP pipe (11) and the second GRP pipe (12), and the hand chain hoist (3) is fixedly connected to the tensioning ring (14); An X-shaped baffle (15) is used to fix the socket sleeve (2), the X-shaped baffle (15) is in contact with one end of the socket sleeve (2) away from the first GRP pipe (11), the hook of the hand chain hoist (3) is connected to the X-shaped baffle (15), and the hand chain hoist (3) is used to insert one end of the first GRP pipe (11) into the socket sleeve (2).

3. A GRP pipe connection method according to claim 2, characterized in that: The four ends of the X-shaped baffle (15) are connected to the hand chain hoist (3), and one end of the first GRP pipe (11) is inserted into the socket sleeve (2) using a four-point pulling method.

4. A GRP pipe connection method according to claim 2, characterized in that: A3 comprises: fixing a hand chain hoist (3) to a tensioning ring (14) of a first GRP pipe (11), connecting a hook of the hand chain hoist (3) to a tensioning ring (14) of a second GRP pipe (12), and using the hand chain hoist (3) to insert one end of the second GRP pipe (12) into a socket sleeve (2).

5. A GRP pipe connection method according to any one of claims 1 to 4, characterized in that: Before A1, the GRP pipe and the socket sleeve (2) to be connected are inspected and the sealing ring (21) is installed, including: Check that the socket of the socket sleeve (2) and the GRP pipe spigot to be connected are smooth and have no protrusions; Check that there is no delamination in the sealing ring groove of the socket sleeve (2); A lubricant is applied to the surface of the sealing ring (21), and the sealing ring (21) is installed in the sealing ring groove of the socket sleeve (2). Four sealing rings (21) are installed on the same socket sleeve (2). The side of the sealing ring (21) in contact with the GRP pipe to be connected is serrated, and the direction of the serrated is opposite to the direction in which the GRP pipe to be connected is inserted into the socket sleeve (2).

6. A GRP pipe connection method according to claim 1, characterized in that: B2 includes: Prepare the mixed glue. When the ambient temperature is 33±3 degrees Celsius, the ratio of resin to curing agent is 75:

1. When the ambient temperature is 40±3 degrees Celsius, the ratio of resin to curing agent is 125:

1. The curing agent is triethylenetetramine. Mix the expected amount of resin and curing agent in proportion. Sealing and polishing: grinding and chamfering the interface between the first GRP pipe (11) and the second GRP pipe (12), and sealing the first GRP pipe (11) and the second GRP pipe (12) with the prepared mixed glue; After the mixed glue is solidified, remove the excess mixed glue; The interface surfaces of the first GRP pipe (11) and the second GRP pipe (12) are polished.

7. A GRP pipe connection method according to claim 1, characterized in that B3 include: The polished interface surface is coated with resin, and the interface of the first GRP pipe (11) and the second GRP pipe (12) is wrapped with glass cloth. The coating of resin and the wrapping of glass cloth are performed alternately. During the wrapping, the glass cloth is continuously rolled with a pressure roller to drive out the bubbles inside.

8. A GRP pipe connection method according to claim 1, characterized in that: Prior to B1, the pipe ends of the first GRP pipe (11) and the second GRP pipe (12) to be connected are cleaned and dried, and the first GRP pipe (11) and the second GRP pipe (12) to be connected are cut and blanked.

9. A GRP pipe connection method according to claim 1, characterized in that: In C2, a torque wrench is used to tighten the bolts in increments of 6N / m-8N / m, and the torque value of the bolts gradually reaches 35N / m.

10. A GRP pipe connection method according to claim 1, characterized in that: C1 Before installation, clean the flange (4) and install the O-ring (45) in the flange groove of the flange (4).

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