A steel epoxy sleeve top-in and top-out pouring device and pouring method thereof

Abstract

The present invention belongs to the technical field of oil and gas pipeline repair, and discloses a steel epoxy sleeve top-in and top-out filling device, including a sleeve and a filling device, the filling device including a feed assembly, a vacuum connecting pipe, a buffer tank and an exhaust assembly; a buffer tank is obliquely arranged above the sleeve, and the buffer tank and the sleeve are connected through at least two vacuum connecting pipes; the discharge port of the feed assembly is connected to the feed port of the sleeve, and the feed port of the sleeve is arranged adjacent to the vacuum connecting pipe with the lowest height; the exhaust assembly is connected to the high end of the buffer tank; and a steel epoxy sleeve top-in and top-out filling method is also disclosed. The present invention solves the problem that bubbles in the filling material are difficult to eliminate when repairing the steel epoxy sleeve by the existing filling method, and avoids the disturbance of the filling material during feeding due to too small a space, and can replenish the cavity formed when the filling material in the sleeve is cured and shrunk from the buffer tank and the vacuum connecting pipe.

Description

Technical Field

[0001] The invention belongs to the technical field of oil and gas pipeline repair, and in particular relates to a steel epoxy sleeve top-in and top-out pouring device and a pouring method thereof. Background Art

[0002] In recent years, with the increasing demand for energy, the mileage of oil and gas pipelines in China has also increased. Due to the effects of corrosion, fatigue, mechanical damage, etc., as well as defects caused by the production, welding and installation of new pipelines, the strength and overall life of the pipelines have been greatly reduced, posing huge safety hazards to downstream production and life and the lives and property of the people.

[0003] Steel epoxy sleeve reinforcement repair technology is widely used in the repair of oil and gas pipeline defects due to its strong resistance to bending moment, resistance to axial shear, excellent defect stress sharing effect, no fire and easy and reliable installation. In order to ensure the repair effect, it is necessary to ensure that the filling material can fill the gap between the pipeline and the steel epoxy sleeve, as well as the density of the filling material.

[0004] However, there are two main methods of perfusion for steel epoxy sleeves that are commonly used: positive pressure perfusion and negative pressure perfusion. During positive pressure perfusion, a large amount of air will be brought in due to the stirring of the filling material and the pump injection into the steel epoxy sleeve, forming bubbles. The filling material has a certain viscosity, and the bubbles formed are wrapped in the filling material, which is extremely difficult to remove, causing the performance of the filling material to drop significantly. During negative pressure perfusion, the pump injection link is removed, and the filling material directly enters the steel epoxy sleeve from the bottom through the connecting pipe from the barrel containing the filling material, reducing the bubbles generated by the pump. The bubbles generated by stirring can be eliminated by vacuum to some of the bubbles on the interface, but the internal bubbles are still difficult to eliminate. Summary of the invention

[0005] The invention aims to provide a steel epoxy sleeve top-in and top-out perfusion device and a perfusion method thereof, so as to solve the problem that bubbles in the filling material are difficult to eliminate when repairing the steel epoxy sleeve by the existing perfusion method.

[0006] The technical solution adopted by the present invention is:

[0007] A top-in and top-out perfusion device for a steel epoxy sleeve comprises a sleeve and a perfusion device, wherein the perfusion device comprises a feed assembly, a vacuum connecting pipe, a buffer tank and an exhaust assembly; a buffer tank is obliquely arranged above the sleeve, and the buffer tank and the sleeve are connected through at least two vacuum connecting pipes; the outlet of the feed assembly is connected to the feed inlet of the sleeve, and the feed inlet of the sleeve is arranged adjacent to the vacuum connecting pipe with the lowest height; the exhaust assembly is connected to the high end of the buffer tank.

[0008] In a preferred technical solution, the feed assembly includes a stuffing barrel, a stuffing connecting pipe and a first valve; the stuffing barrel is connected to the top of the sleeve through a longitudinal stuffing connecting pipe; the first valve is arranged on the stuffing connecting pipe, and the connection between the stuffing barrel and the sleeve is controlled by the first valve.

[0009] In a preferred technical solution, the vacuum assembly includes a vacuum pump, a second valve and a vacuum gauge, and the top of the buffer tank is connected to the vacuum pump via a vacuum pipe; the second valve and the vacuum gauge are respectively provided on the vacuum pipe.

[0010] In a preferred technical solution, three vacuum connecting pipes are provided, and the vacuum connecting pipes are respectively provided at the left end, the middle part, and the right end of the sleeve with increasing heights from left to right.

[0011] A filling method based on the above-mentioned steel epoxy sleeve top-in and top-out filling device comprises the following steps:

[0012] Step S1: close the first valve, pour the evenly stirred filling material into the filling barrel, and then open the second valve to evacuate the vacuum;

[0013] Step S2: when the sleeve is in a negative pressure state, the first valve is opened, and the filling material continuously enters the sleeve through the filling connecting pipe;

[0014] Step S3: When the filling material enters the vacuum connecting tube in sequence, the bubbles are discharged in sequence under the action of negative pressure and enter the buffer tank until they are flush with the vacuum connecting tube with the highest height;

[0015] Step S4: Turn off the vacuum pump, the filling is completed, and wait for the filling material in the sleeve to solidify and release heat.

[0016] In a preferred technical solution, the first valve is opened when the negative pressure of the sleeve reaches a negative pressure state of 0.08 MPa.

[0017] Beneficial effects of the present invention:

[0018] (1) By arranging a buffer exhaust device on the sleeve, after the filler enters the sleeve, it can be buffered through multiple vacuum connecting pipes and the space of the buffer tank, thereby avoiding the disturbance of the filler during feeding due to too small a space, and the cavity formed when the filler in the sleeve solidifies and shrinks can be supplemented from the buffer tank and the vacuum connecting pipe.

[0019] (2) The buffer exhaust device is axially connected to the top of the sleeve through multiple points, which solves the problem that the exhaust end of the sleeve must be installed at the highest point of the pipeline when using the existing perfusion method. This can effectively discharge the bubbles accumulated on the top and avoid the formation of a cavity on the top of the sleeve.

[0020] (3) Negative pressure is used to pour the filler from the top end face of the sleeve. Under the action of gravity, the filler will flow downward along the inner surface of the sleeve and the surface of the pipe. The thickness is thin, and the area in contact with the vacuum environment is greatly increased, which is very conducive to the discharge of bubbles wrapped in the filler due to stirring.

[0021] (4) The filler enters the sleeve from the top of the sleeve, and the filler will be exposed to the vacuum for the first time, thereby solving the problem that the filler enters the sleeve from the bottom and the bubbles are not easy to be discharged. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the state of the present invention when the filling material is added into the filling barrel;

[0023] Figure 2 It is a schematic diagram of the state of the present invention when the filling material enters the sleeve;

[0024] Figure 3 It is a schematic diagram of the direction of bubble discharge after the filling material enters the sleeve of the present invention;

[0025] Figure 4 It is a schematic diagram of the state of the present invention when the filling material enters the low-end vacuum connecting pipe;

[0026] Figure 5 This is a schematic diagram of the present invention in a state where the filling material is exhausted and filled;

[0027] Figure 6 It is a schematic diagram of the state of the solidification shrinkage compensation inside the sleeve of the present invention.

[0028] In the figure: 1-sleeve; 2-vacuum connecting pipe; 3-buffer tank; 4-vacuum gauge; 5-second valve; 6-filling connecting pipe; 7-first valve; 8-filling material; 9-filling barrel. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0032] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0033] In the description of the embodiments of the present invention, it should be noted that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the invention product is usually placed when in use, or the orientation or positional relationship commonly understood by those skilled in the art, or the orientation or positional relationship in which the invention product is usually placed when in use, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0034] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium. For ordinary technicians in this field, the above terms can be understood in specific circumstances in the drawings in the specific embodiments of the present invention, and the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings herein can be arranged and designed in various different configurations.

[0035] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0036] The invention provides a steel epoxy sleeve top-in and top-out pouring device.

[0037] Combination Figure 1-6 As shown, a steel epoxy sleeve top-in and top-out perfusion device comprises a sleeve 1 and a buffer exhaust device, wherein the buffer exhaust device comprises a feed assembly, a vacuum connecting pipe 2, a buffer tank 3 and an exhaust assembly; a buffer tank 3 is obliquely arranged above the sleeve 1, and the buffer tank 3 is connected to the sleeve 1 through at least two vacuum connecting pipes 2; the discharge port of the feed assembly is connected to the feed port of the sleeve 1, and the feed port of the sleeve 1 is adjacent to the vacuum connecting pipe 2 with the lowest height; the exhaust assembly is connected to the high end of the buffer tank 3.

[0038] The buffer tank 3 is arranged obliquely above the sleeve 1 and is connected to the sleeve 1 through at least two vacuum connecting tubes 2 of different heights, so that the buffer tank 3, the vacuum connecting tube 2 and the sleeve 1 can be connected to form a connected filling space, so that when the filling material 8 in the sleeve 1 is nearly full, it can enter the vacuum connecting tube 2 and the buffer tank 3, avoiding the disturbance of the filling material 8 during feeding due to too small space. By arranging the buffer tank 3 obliquely, the extracted air is more convenient to be gathered together, avoiding the problem of bubbles being dispersed and difficult to eliminate. The discharge port of the feeding assembly is arranged adjacent to the vacuum connecting tube 2 with the lowest height, and the filling material can overflow from one end to the other end after entering the sleeve 1, so that the air in the sleeve 1 and the air extracted by negative pressure in the filling material 8 can be discharged through the vacuum connecting tube 2, so that the discharge is more thorough. The interconnected filling spaces also facilitate the filling material 8 in the sleeve 1 to supplement the cavity formed during curing shrinkage from the buffer tank 3 and the vacuum connecting tube 2, so that the repair is more complete.

[0039] Furthermore, by placing the feed assembly above the sleeve, negative pressure is used to pour the filler 8 from the top end face of the sleeve 1. The filler 8 will flow downward along the inner surface of the sleeve 1 and the surface of the pipe under the action of gravity. The thickness is relatively thin, and the area in contact with the vacuum environment is greatly increased, which is very conducive to the discharge of bubbles wrapped by the filler 8 due to stirring. The filler 8 enters the sleeve 1 from the top of the sleeve 1, and the filler 8 will contact the vacuum for the first time, thereby solving the problem that the filler 8 enters the sleeve 1 from the bottom and the bubbles are not easy to be discharged.

[0040] In order to better feed when the sleeve 1 is in a negative pressure state, such as Figure 1 As shown, in a preferred embodiment, the feeding assembly includes a filling barrel 9, a filling connecting pipe 6 and a first valve 7; the filling barrel 9 is arranged above the sleeve 1 through the longitudinal filling connecting pipe 6, and the longitudinal filling connecting pipe 6 enables the filling material 8 to flow into the sleeve 1 under the action of gravity; the first valve 7 is arranged on the filling connecting pipe 6, and the connection between the filling barrel 9 and the sleeve 1 is controlled by the first valve 7.

[0041] In order to better evacuate and control the sleeve 1, Figure 1 As shown, in a preferred embodiment, the vacuum pump assembly includes a vacuum pump, a second valve 5 and a vacuum gauge 4, and the top of the buffer tank 3 is connected to the vacuum pump through a vacuum pipe; the second valve 5 and the vacuum gauge 4 are respectively arranged on the vacuum pipe, the vacuum gauge 4 is used to display the air pressure value, and the second valve 5 is used to control the connection between the buffer tank 3 and the vacuum pump.

[0042] In order to better facilitate the discharge of gas, Figure 1As shown, in a preferred embodiment, three vacuum connecting pipes 2 are provided, and are respectively arranged at the left end, middle part and right end of the sleeve 1 with increasing height from left to right. The three vacuum connecting pipes 2 are all arranged vertically on the sleeve 1 longitudinally, and are distributed at the left end, middle part and right end of the sleeve 1 at intervals from each other, so that the air in different parts of the sleeve 1 can be discharged easily.

[0043] The present invention further provides a filling method for the steel epoxy sleeve top-in and top-out filling device according to any one of the above embodiments, comprising the following steps:

[0044] Step S1: Close the first valve 7, pour the mixed filling material 8 into the filling barrel 9, and then open the second valve 5 to evacuate the vacuum. Figure 1 As shown;

[0045] Step S2: When the sleeve 1 is in a negative pressure state, the first valve 7 is opened, and the filling material 8 continuously enters the sleeve 1 through the filling connecting pipe 6. Figure 2-3 As shown;

[0046] As more and more filler 8 enters the interior of the sleeve 1, the bubbles wrapped in the filler 8 are vacuumed out on the surface of the pipe and the inner surface of the sleeve 1. After the filler 8 enters the sleeve, it will adhere to the inner wall of the sleeve 1 and the outer wall of the pipe and flow downward under the action of gravity.

[0047] Step S3: As the filling material 8 enters the vacuum connecting tube 2 in sequence, the bubbles are discharged in sequence under the action of negative pressure and enter the buffer tank until they are flush with the vacuum connecting tube 2 with the largest height. Figure 4-5 As shown;

[0048] When the poured filling material 8 enters the vacuum connecting tube 2 at the lowest axial end of the pipeline, the filling material 8 has viscosity, which slows down its rising speed, so that the filling material can smoothly enter the higher vacuum connecting tubes 2 in sequence. At the same time, the gas wrapped in the filling material 8 will continue to be discharged along the vacuum connecting tube 2.

[0049] Step S4: Turn off the vacuum pump, and the filling is completed, and wait for the filling material 8 in the sleeve 1 to solidify and release heat. Figure 6 shown.

[0050] During the curing process of the filling material, there will be a certain shrinkage. Since there is less potting material in the buffer exhaust device, the heat released during curing is not as much as that inside the sleeve 1. Therefore, the curing time will be longer than that inside the sleeve 1. The shrinkage volume caused by the curing inside the sleeve 1 can be supplemented by the filling material 8 in the buffer exhaust device, thereby avoiding the formation of cavities due to the shrinkage of the filling material 8.

[0051] In order to facilitate the filling material 8 to enter the sleeve 1 under a suitable negative pressure state, as shown in FIG. Figure 1As shown, in a preferred embodiment, the first valve 7 is opened when the negative pressure of the sleeve 1 reaches a negative pressure state of 0.08 MPa.

[0052] The present invention is not limited to the above-mentioned optional implementation modes. Anyone can derive other various forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, all technical solutions that fall within the scope defined by the claims of the present invention fall within the protection scope of the present invention.

Claims

1. A filling method for a steel epoxy sleeve top-in and top-out filling device, characterized in that: The pouring device comprises a sleeve (1) and a buffer exhaust device, wherein the buffer exhaust device comprises a feed assembly, a vacuum connecting pipe (2), a buffer tank (3) and an exhaust assembly; a buffer tank (3) is arranged obliquely above the sleeve (1), and the buffer tank (3) and the sleeve (1) are connected via at least two vacuum connecting pipes (2); an outlet of the feed assembly is connected to an inlet of the sleeve (1), and the inlet of the sleeve (1) is arranged adjacent to the vacuum connecting pipe (2) with the lowest height; and the exhaust assembly is connected to the high end of the buffer tank (3); The feed assembly comprises a stuffing barrel (9), a stuffing connecting pipe (6) and a first valve (7); the stuffing barrel (9) is connected to the top of the sleeve (1) via the longitudinal stuffing connecting pipe (6); the first valve (7) is arranged on the stuffing connecting pipe (6), and controls the communication between the stuffing barrel (9) and the sleeve (1) via the first valve (7); The vacuum assembly comprises a vacuum pump, a second valve (5) and a vacuum gauge (4); the top end of the buffer tank (3) is connected to the vacuum pump via a vacuum pipe; the second valve (5) and the vacuum gauge (4) are respectively arranged on the vacuum pipe; The following steps are involved: Step S1: close the first valve (7), pour the evenly stirred filling material (8) into the filling barrel (9), and then open the second valve (5) to evacuate the vacuum; Step S2: when the sleeve (1) is in a negative pressure state, the first valve (7) is opened, and the filling material (8) continuously enters the sleeve (1) through the filling material connecting pipe (6); Step S3: When the filling material (8) enters the vacuum connecting tube (2) in sequence, the bubbles are discharged in sequence under the action of negative pressure and enter the buffer tank until they are flush with the vacuum connecting tube (2) with the highest height; Step S4: Turn off the vacuum pump, and the filling is completed, and wait for the filling material (8) in the sleeve (1) to solidify and release heat.

2. The filling method of the steel epoxy sleeve top-in and top-out filling device according to claim 1 is characterized in that: The vacuum connecting pipes (2) are provided in three numbers, and are respectively provided at the left end, the middle part, and the right end of the sleeve (1) in increasing heights from left to right.

3. The filling method of the steel epoxy sleeve top-in and top-out filling device according to claim 1 is characterized in that: When the negative pressure of the sleeve (1) reaches a negative pressure state of 0.08 MPa, the first valve (7) is opened.

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