Opening method of underwater glass fiber reinforced plastic exhaust tee joint

Abstract

An opening method of an underwater glass fiber reinforced plastic exhaust tee joint comprises the following steps that a protection pipe is installed, specifically, the protection pipe is pressed on a main pipe from the upper portion of the main pipe, an operation space is defined, and a first joint is formed between the lower end of the protection pipe and the surface of the main pipe; sealing the first joint with an underwater curing agent; glass fiber reinforced plastic is manually pasted, after the underwater curing agent is cured, resin and glass fiber are manually pasted on the inner wall of the protective pipe and the outer wall of the main pipe in the operation space to form a glass fiber reinforced plastic connecting part, and the glass fiber reinforced plastic connecting part covers the first joint; and drilling: drilling holes in the main pipe in the operation space, and drilling exhaust holes in the main pipe. The protection pipe separates outside underground water to form a dry operation space, and a waterproof space and time for glass fiber reinforced plastic hand pasting operation are provided. The exhaust structure is made of hand lay-up glass fiber reinforced plastics, has no metal parts, is not easy to corrode and has long service life. And the exhaust hole can be opened without stopping the main pipe, so that the loss caused by stopping of the main pipe is effectively avoided.

Description

Technical Field

[0001] The invention relates to the field of glass fiber reinforced plastic pipes, in particular to an opening method for an underwater glass fiber reinforced plastic exhaust tee. Background Art

[0002] At present, a small amount of exhaust is required during the water supply and drainage process of the FRP pipe system, and a large amount of air intake and exhaust is required during the hydraulic transition. If the FRP main pipe does not have a reserved exhaust hole, it is necessary to punch holes in the FRP main pipe and install an exhaust tee. When the FRP main pipe is laid underwater or below the groundwater level, drilling holes in the FRP main pipe and pasting the tee cannot be done underwater.

[0003] At present, there are mainly the following ways to solve this problem: Patent application number 2017212806342, named "Groove-type Half Joint Tee", discloses a Half Joint Tee, where an upper Half Joint and a lower Half Joint that can be clasped on the main pipe are installed at the pipe opening, and the two sides of the upper Half Joint and the lower Half Joint are connected by bolts and nuts through multiple bolt holes. This method can be used for a short period of time, but long-term use of rigid parts such as bolts and nuts is susceptible to corrosion by external media and has a short life. The main pipe stops running to ensure that no water flows out of the pipe when the hole is opened, and precipitation is used to create dry FRP pasting conditions for the FRP pipe exhaust tee pasting. This method has certain limitations. When the main pipe cannot stop running or the precipitation method outside the pipe does not meet the FRP pasting conditions, the exhaust port cannot be opened. The existing exhaust port openings have shortcomings and need further improvement. Summary of the invention

[0004] The purpose of the present invention is to overcome the above-mentioned shortcomings and provide an opening method for an underwater fiberglass exhaust tee with a long exhaust structure life and no main pipe shutdown requirement.

[0005] To achieve the above object, the technical solution of the present invention is: a method for opening an underwater fiberglass exhaust tee, comprising the following steps: The protective pipe is installed by pressing the protective pipe onto the main pipe from above to enclose a working space, and a first joint is formed between the lower end of the protective pipe and the surface of the main pipe; the first joint is sealed with an underwater curing agent; Hand lay-up of FRP: after the underwater curing agent is cured, hand lay-up of resin and glass fiber on the inner wall of the protective pipe and the outer wall of the main pipe in the working space to form a FRP connection part, and the FRP connection part covers the first joint; Open holes, drill holes in the main pipe in the working space, and drill exhaust holes on the main pipe.

[0006] The protective pipe separates the external groundwater to form a dry working space. The hole opening and hand lay-up of FRP in the working space can be carried out in the waterless space. The exhaust structure is made of hand lay-up FRP, which has no metal parts, is not easily corroded, and has a long service life. The exhaust hole can be opened without stopping the main pipe, which effectively avoids the loss caused by the main pipe stopping.

[0007] Preferably, the method further comprises the following steps: Branch pipe installation: place the branch pipe on the main pipe in the working space; In the hand lay-up FRP step, the FRP connection portion extends to the outer wall of the branch pipe; In the hole-opening step, an exhaust hole is opened in the main pipe from the branch pipe.

[0008] When there is no requirement for the diameter of the exhaust tee, directly use the protective pipe as the exhaust tee. When there is a requirement for the diameter of the exhaust tee, use a branch pipe with a small diameter as the exhaust tee.

[0009] Preferably, in the step of installing the protective tube, the first seam is covered from the outside of the protective tube with an underwater curing agent to form an outer closed portion; the first seam is covered from the inside of the protective tube with an underwater curing agent to form an inner closed portion; the underwater curing agent is a mixture of 70-100 parts by mass of an underwater epoxy curing agent and 0-30 parts of putty powder; In the hand lay-up FRP step, the FRP connecting part covers the inner closing part.

[0010] The underwater epoxy curing agent can be cured underwater, and the putty powder is a water-based putty powder that can absorb moisture and react with water to form a colloid. After the underwater epoxy curing agent and putty powder are mixed, they can be cured in a water environment and seal the first joint.

[0011] Preferably, before the hand lay-up of the fiberglass reinforced plastics step, the following steps are also included: Dry, drain the water in the working space, wipe the water on the inner wall of the protective pipe and the outer wall of the main pipe in the working space to reduce the interference of moisture on the curing of resin.

[0012] Preferably, a flexible rubber skirt is provided on the outer side of the lower end of the protection tube, and when the protection tube is pressed on the main tube, the rubber skirt covers the first seam and the lower end of the rubber skirt is attached to the outer wall of the main tube; In the steps of installing the protective pipe, after the protective pipe is pressed onto the main pipe, the top of the protective pipe is covered with an upper cover to seal the working space; air is filled into the working space to discharge the water in the working space from the first joint until the water in the working space is emptied, and then the air filling is stopped; the upper cover is opened, and the first joint is covered from the inside of the protective pipe with an underwater curing agent to form an inner closed portion; the lower end of the rubber skirt is grasped, the rubber skirt is flipped up, and the first joint is covered from the outside of the protective pipe with an underwater curing agent to form an outer closed portion, and the rubber skirt is lowered to cover the outer closed portion.

[0013] The working space is filled with air, and water in the working air can be discharged from the first joint. The lower end of the rubber skirt can be attached to the outer wall of the main pipe, and the first joint can be sealed from the outside of the protective pipe under the external water pressure. The inner sealing part can be cured and sealed in a water-less environment. The rubber skirt can cover the outer sealing part of the first joint to prevent the underwater environment outside the main pipe from affecting the outer sealing part.

[0014] Preferably, before the hand lay-up of the fiberglass reinforced plastics step, the following steps are also included: Drying, cover the top of the protective tube with the upper cover to close the working space; the upper cover includes a cover body and a fan, the cover body is provided with an air inlet pipe and an exhaust passage, the air inlet pipe is connected with the fan; when the upper cover covers the protective tube, the exhaust passage connects the working space with the outside, and the lower end of the air inlet pipe extends into the working space; open the exhaust passage, and the fan blows hot air into the working space through the air inlet pipe.

[0015] The first joint is sealed with an underwater curing agent. After the first joint is sealed, the water in the working space is drained, and a waterless environment suitable for hand lay-up FRP operations can be created in the working space. However, when the water in the working space is drained, there will still be a certain amount of residue after it is drawn out and wiped dry, and the main pipe continues to run, and condensation water is generated on the outer wall. After hot air is introduced into the working space, the curing of the underwater curing agent can be accelerated, and the drying of the working space can be accelerated.

[0016] Preferably, after the hand lay-up of the fiberglass reinforced plastics step, the following steps are also included: Cover the top of the protective tube with the upper cover to seal the working space; a UV light source is provided at the bottom of the upper cover, which irradiates the FRP joints, and pressurized air is filled into the working space through the upper cover to keep the air pressure in the working space within the set pressure range. After the FRP joints are cured, turn off the UV light source and open the upper cover. Ordinary FRP resins take a long time to cure, and construction requires a long waiting time. Over time, some first joints that are not well sealed will leak. The resin of hand-laid FRP can be mixed with UV light-curing resin to accelerate the curing of the FRP joints and speed up construction.

[0017] By adopting the above technical solution, the beneficial effects of the present invention are as follows: the protective pipe of the present invention isolates the external groundwater to form a dry working space, providing a space and time for water-proof hand-laid fiberglass operation. The exhaust structure is made of hand-laid fiberglass, has no metal parts, is not easily corroded, and has a long service life. The exhaust hole can be opened without stopping the main pipe, effectively avoiding the loss caused by the main pipe stopping. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of embodiment 1 of the present invention; Figure 2 is a schematic diagram of the method of the present invention; Figure 3 This is a schematic diagram of the structure of Embodiment 2 of the present invention; Figure 4 This is a schematic diagram of the structure of Example 3 of the present invention.

[0019] Description of main reference numerals: Main pipe 1; protective pipe 2; working space 3; first joint 4; inner closed part 51; outer closed part 52; glass fiber reinforced plastic connecting part 6; branch pipe 7; upper cover 8; fan 81; air inlet pipe 82; exhaust channel 83; UV light source 84. DETAILED DESCRIPTION

[0020] The present invention is further described below with reference to the accompanying drawings and specific embodiments.

[0021] Embodiment 1: like Figure 1-Figure 2 As shown, the present invention provides an opening method for an underwater fiberglass reinforced plastic exhaust tee, comprising the following steps: S1: Installation of the protection pipe: the vertical protection pipe 2 is pressed onto the horizontal main pipe 1 from above the main pipe 1 to enclose a working space 3. A first joint 4 is formed between the lower end of the protection pipe 2 and the outer surface of the main pipe 1; The first joint is sealed with an underwater curing agent. The first joint 4 is covered with the underwater curing agent from the inner side of the protection tube 2 to form an inner closed portion 51. The first joint 4 is covered with the underwater curing agent from the outer side of the protection tube 2 to form an outer closed portion 52. The underwater curing agent is a mixture of 70-100 parts of underwater epoxy curing agent and 0-30 parts of putty powder by mass.

[0022] S2 drying: after the underwater curing agent is cured and the inner sealing part 51 and the outer sealing part 52 seal the first joint, the water in the working space is drained and the water on the inner wall of the protective pipe and the outer wall of the main pipe in the working space is wiped dry.

[0023] S3 hand lay-up of FRP, where resin and glass fiber are hand laid on the inner wall of the protective tube 2 and the outer wall of the main tube 1 in the working space to form a FRP connecting part 6, which covers the first joint position and covers the inner closed part 51.

[0024] S4 drilling, drilling holes in the main pipe in the working space, and drilling exhaust holes on the main pipe.

[0025] Embodiment 2: like Figure 2-Figure 3 As shown, the present invention provides an opening method for an underwater fiberglass reinforced plastic exhaust tee, comprising the following steps: S1: Installation of the protection pipe: the vertical protection pipe 2 is pressed onto the horizontal main pipe 1 from above the main pipe 1 to enclose a working space 3. A first joint 4 is formed between the lower end of the protection pipe 2 and the outer surface of the main pipe 1; The first joint is sealed with an underwater curing agent. The first joint 4 is covered with the underwater curing agent from the inner side of the protection tube 2 to form an inner closed portion 51. The first joint 4 is covered with the underwater curing agent from the outer side of the protection tube 2 to form an outer closed portion 52. The underwater curing agent is a mixture of 70-100 parts of underwater epoxy curing agent and 0-30 parts of putty powder by mass.

[0026] S2 drying: after the underwater curing agent is cured and the inner sealing part 51 and the outer sealing part 52 seal the first joint, the water in the working space is drained and the water on the inner wall of the protective pipe and the outer wall of the main pipe in the working space is wiped dry.

[0027] S3 branch pipe installation, place the branch pipe on the main pipe in the working space.

[0028] S4 hand lay-up of FRP, hand lay-up of resin and glass fiber on the inner wall of the protection pipe 2 and the outer wall of the main pipe 1 in the working space to form a FRP connection part 6, the FRP connection part 6 covers the first joint position, and the FRP connection part 6 covers the inner closed part 51. The FRP connection part 6 extends to the outer wall of the branch pipe 7.

[0029] S5: Drilling. After the glass fiber reinforced plastic connecting part 6 is solidified, a drill is inserted from the branch pipe to open an exhaust hole in the main pipe.

[0030] Embodiment 3: like Figure 2 and Figure 4 As shown, the present invention provides an opening method for an underwater fiberglass reinforced plastic exhaust tee, comprising the following steps: S1 protective tube installation, the vertical protective tube 2 is pressed on the horizontal main tube 1 from above the main tube 1, and an operating space 3 is enclosed. A first seam 4 is formed between the lower end of the protective tube 2 and the outer surface of the main tube 1. A flexible rubber skirt 21 is provided on the outer side of the lower end of the protective tube 2. When the protective tube 2 is pressed on the main tube 1, the rubber skirt 21 covers the first seam 4, and the lower end of the rubber skirt 21 is attached to the outer wall of the main tube 1.

[0031] Cover the top of the protective tube with the upper cover 8 to seal the working space. Close the exhaust passage 83 of the upper cover, and the fan 81 fills air into the working space 3 through the air inlet pipe 82, so that the water in the working space 3 is discharged from the first joint 4, until the water in the working space is emptied, and the fan stops filling air into the working space 3. Open the upper cover 8, and cover the first joint 4 from the inner side of the protective tube 2 with an underwater curing agent to form an inner closed portion 51. The upper cover includes a cover body and a fan. The cover body is provided with an air inlet pipe and an exhaust passage, and the air inlet pipe is connected to the fan; when the upper cover covers the protective tube, the exhaust passage connects the working space and the outside, and the lower end of the air inlet pipe extends into the working space; After the inner sealing part 51 is cured, the lower end of the rubber skirt is grasped, the rubber skirt is turned up, and the first seam 4 is covered from the outside of the protective tube 2 with an underwater curing agent to form an outer sealing part 52, and the rubber skirt 21 is lowered to cover the outer sealing part 52. The rubber skirt 21 is pressed from the outside to make the rubber skirt fit the outer sealing part 52.

[0032] S2 drying, wiping off the water on the inner wall of the protection tube and the outer wall of the main tube in the working space. Cover the upper end of the protection tube 2 with an upper cover, open the exhaust passage 83 of the upper cover, and the fan 81 blows hot air into the working space through the air inlet pipe.

[0033] S3 hand lay-up FRP, after the working space is dry, open the upper cover, hand lay up the resin and glass fiber on the inner wall of the protective tube 2 and the outer wall of the main tube 1 in the working space to form the FRP connection part 6, the FRP connection part 6 covers the first joint position, and the FRP connection part 6 covers the inner closed part 51. Cover the top of the protective tube 2 with the upper cover to close the working space 3; a UV light source is provided at the bottom of the upper cover, the UV light source irradiates the FRP connection part 6, and pressurized air is filled into the working space through the upper cover to keep the air pressure in the working space within the set pressure range. After the FRP connection part 6 is cured, turn off the UV light source and open the upper cover.

[0034] S4 is a process of drilling a hole in the main pipe in the working space, and drilling an exhaust hole 11 on the main pipe 1.

[0035] The above-mentioned are only preferred embodiments of the present invention and cannot limit the scope of implementation of the present invention. All equivalent changes and decorations made according to the scope of the patent application of the present invention should still fall within the scope of the present invention.

Claims

1. A method for opening an underwater fiberglass exhaust tee, characterized in that: The following steps are involved: The protective pipe is installed by pressing the protective pipe onto the main pipe from above to enclose a working space, and a first joint is formed between the lower end of the protective pipe and the surface of the main pipe; the first joint is sealed with an underwater curing agent; Hand lay-up of FRP: after the underwater curing agent is cured, hand lay-up of resin and glass fiber on the inner wall of the protective pipe and the outer wall of the main pipe in the working space to form a FRP connection part, and the FRP connection part covers the first joint; Open holes, drill holes in the main pipe in the working space, and drill exhaust holes on the main pipe.

2. The method for opening an underwater FRP exhaust tee according to claim 1, characterized in that: The following steps are also included: Branch pipe installation: place the branch pipe on the main pipe in the working space; In the hand lay-up FRP step, the FRP connection portion extends to the outer wall of the branch pipe; In the hole-opening step, an exhaust hole is opened in the main pipe from the branch pipe.

3. The method for opening an underwater FRP exhaust tee according to claim 1, characterized in that: In the step of installing the protection tube, the first joint is covered from the outside of the protection tube with an underwater curing agent to form an outer closed portion; the first joint is covered from the inside of the protection tube with an underwater curing agent to form an inner closed portion; the underwater curing agent is a mixture of 70-100 parts by mass of an underwater epoxy curing agent and 0-30 parts of putty powder; In the hand lay-up FRP step, the FRP connecting part covers the inner closing part.

4. The method for opening an underwater FRP exhaust tee according to claim 1, characterized in that: Before the hand lay-up of FRP, the following steps are also included: Dry, drain the water in the working space, and wipe the water on the inner wall of the protective pipe and the outer wall of the main pipe in the working space.

5. The method for opening an underwater FRP exhaust tee according to claim 1, characterized in that: A flexible rubber skirt is provided on the outer side of the lower end of the protection tube. When the protection tube is pressed on the main tube, the rubber skirt covers the first seam and the lower end of the rubber skirt is attached to the outer wall of the main tube. In the steps of installing the protective pipe, after the protective pipe is pressed onto the main pipe, the top of the protective pipe is covered with an upper cover to seal the working space; air is filled into the working space to discharge the water in the working space from the first joint until the water in the working space is emptied, and then the air filling is stopped; the upper cover is opened, and the first joint is covered from the inside of the protective pipe with an underwater curing agent to form an inner closed portion; the lower end of the rubber skirt is grasped, the rubber skirt is flipped up, and the first joint is covered from the outside of the protective pipe with an underwater curing agent to form an outer closed portion, and the rubber skirt is lowered to cover the outer closed portion.

6. The method for opening an underwater FRP exhaust tee according to claim 1, characterized in that: Before the hand lay-up of FRP, the following steps are also included: Drying, cover the top of the protective tube with the upper cover to close the working space; the upper cover includes a cover body and a fan, the cover body is provided with an air inlet pipe and an exhaust passage, the air inlet pipe is connected with the fan; when the upper cover covers the protective tube, the exhaust passage connects the working space with the outside, and the lower end of the air inlet pipe extends into the working space; open the exhaust passage, and the fan blows hot air into the working space through the air inlet pipe.

7. The method for opening an underwater FRP exhaust tee according to claim 1, characterized in that: After the hand lay-up of FRP, the following steps are also included: Cover the top of the protective tube with an upper cover to seal the working space; a UV light source is provided at the bottom of the upper cover, which irradiates the FRP connection, and pressurized air is filled into the working space through the upper cover to keep the air pressure in the working space within the set pressure range. After the FRP connection is cured, turn off the UV light source and open the upper cover.

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