A composite reinforcing structure for a cracked pipeline, a construction tool and a construction method thereof

Abstract

The present application relates to oilfield oil pipeline reinforcing technical field, specifically relates to a kind of composite reinforcing structure for cracked pipeline, construction tool and its construction method, wherein composite reinforcing structure includes high polymer solidification layer, glass fiber layer and carbon fiber layer;The high polymer solidification layer, glass fiber layer and carbon fiber layer are all cylindrical structure, and are sequentially stacked from inside to outside and wrapped on cracked pipeline, and the glass fiber layer is spliced by two half-cylinder structures.This application is convenient to reinforce construction to pipeline crack, and welding is not needed in construction, to avoid introducing open fire, more safe and reliable.

Description

Technical Field

[0001] This invention relates to the field of oilfield pipeline reinforcement technology, specifically to a composite reinforcement structure, construction tools, and construction method for cracked pipelines. Background Technology

[0002] Steel pipelines are currently the most economical and safest long-distance gas and liquid transportation tool. According to statistics, as of 2019, the total length of oil and gas pipelines in my country reached 139,000 kilometers, and it is expected to reach 240,000 kilometers by 2025.

[0003] Steel pipelines for gas-liquid transportation have been in service for a long time and have been subjected to harsh conditions such as pressure, corrosive media, high temperature and humid environment, which has led to defects such as corrosion, thinning of pipe wall and cracks.

[0004] There are two traditional techniques for reinforcing cracked pipes:

[0005] The first method involves replacing the pipe with a new one by cutting and welding. This method requires stopping the pipeline and emptying it, which presents significant construction difficulties. In addition, the welding process introduces open flames, making it unsuitable for oil pipeline construction.

[0006] The second method involves using a plugging clamp to reinforce the crack, as disclosed in Chinese Utility Model Patent No. CN201620495343.4, which discloses a pipe plugging clamp that includes: a support, a screw, a steel strip, an oil-resistant rubber sheet, and a support plate.

[0007] The pipe sealing clamp has a rotating screw positioned inside the support. The lower middle end of the support is connected to one end of a steel strip, and the other end of the steel strip rotates and passes through the gap between the steel strip and the screw.

[0008] The screw in the aforementioned pipe sealing clamp has an internal hexagonal nut at the end and a trapezoidal thread on the rod body that engages with the threaded hole on the steel strip.

[0009] The steel strip threaded hole in the aforementioned pipe sealing clamp is a rectangular oblique hole with a round head, the angle of which is the same as the trapezoidal thread on the screw. The center of the steel strip has an arc, the curvature of which is the same as the outer diameter of the screw.

[0010] Although this utility model can be used as a reinforcing tool to be installed on cracked pipes, the coverage of the steel strip is relatively narrow, generally less than 10cm. For some pipes with long cracks, multiple clamps need to be installed, which not only increases the assembly cost and lengthens the installation period, but also results in a large gap between two adjacent clamps, leading to inadequate protection. Summary of the Invention

[0011] The purpose of this invention is to address the shortcomings of existing technologies by providing a composite reinforcement structure, construction tools, and construction method for cracked pipes. This facilitates the reinforcement of cracked pipes, eliminates the need for welding during construction, avoids the introduction of open flames, and is therefore safer and more reliable.

[0012] The technical solution of this invention is:

[0013] A composite reinforcement structure for cracked pipes includes a polymer curing layer, a glass fiber layer, and a carbon fiber layer.

[0014] The polymer curing layer, glass fiber layer, and carbon fiber layer are all cylindrical structures, and are arranged in a sequential order from the inside to the outside, wrapped around the cracked pipe. The glass fiber layer is composed of two semi-cylindrical structures joined together.

[0015] Preferably, it includes a first side plate and a second side plate arranged in parallel;

[0016] The first side plate and the second side plate are respectively provided with pipe holes in the middle that are adapted to the outer diameter of the cracked pipe, and a set of through holes arranged in a ring are also provided on the outside of the pipe holes. A first screw is connected to two through holes on the first side plate and the second side plate respectively in the axial direction. The two ends of the first screw pass through the first side plate and the second side plate respectively and are threaded with limit bolts.

[0017] On the opposite side of the first and second side plates, multiple circumferentially arranged limiting strips are respectively placed, and the circumferentially arranged limiting strips support the cracked pipe and the glass fiber layer, forming an annular grouting cavity for accommodating the polymer curing layer.

[0018] The second side plate is provided with grouting holes that communicate with the grouting cavity.

[0019] Preferably, both the first side plate and the second side plate include an upper plate and a lower plate arranged symmetrically.

[0020] The first side plate and the second side plate are respectively provided with vertical through grooves on both sides of the pipe hole, which penetrate the upper plate and the lower plate. A second lead screw is inserted into the through groove, and the two ends of the second lead screw are respectively connected to locking nuts that clamp and fix the upper plate and the lower plate.

[0021] Preferably, the limiting strip is made of a flexible material.

[0022] Preferably, the limiting strip is made of plastic or rubber.

[0023] Preferably, the thickness of the limiting strip is 1.5-3.5 mm.

[0024] Preferably, both the first side plate and the second side plate are rectangular structures, and both the first side plate and the second side plate have four through holes.

[0025] A construction method for a composite reinforcement structure for cracked pipes includes the following steps:

[0026] Step 1: Grind and clean the areas on the outer surface of the cracked pipe that require reinforcement.

[0027] Step 2: Attach circumferentially arranged limiting strips to the front and back sides of the area on the outer surface of the cracked pipe that needs reinforcement;

[0028] Step 3: The glass fiber layer, which is formed by assembling two semi-cylindrical structures into a cylindrical shape, is placed over the outside of the cracked pipe, and a grouting cavity is formed between the surrounding limiting strips, the glass fiber layer, and the cracked pipe.

[0029] Step 4: The resin-impregnated carbon fiber cloth is wrapped in a ring around the outside of the glass fiber layer, and after curing, the carbon fiber layer is formed.

[0030] Step 5: Apply release agent to the opposite end faces of the first side plate and the second side plate, then fit them onto the cracked pipe, and clamp the first side plate and the second side plate on both sides of the glass fiber layer by tightening the limiting bolts.

[0031] Step 6: Inject the polymer into the grouting cavity through the grouting hole. After the polymer solidifies, it forms the polymer solidified layer.

[0032] Step 7: Remove the first and second side plates from the cracked pipe.

[0033] Compared with the prior art, the present invention has the following advantages:

[0034] The present invention forms an annular grouting cavity by covering the outside of a cracked pipe with a cylindrical glass fiber layer and then filling the space between the cracked pipe and the glass fiber layer with surrounding limiting strips.

[0035] The carbon fiber cloth, which is impregnated with resin, is wrapped in a ring around the outside of the glass fiber layer. After curing, the carbon fiber layer is formed and tightly wraps and fixes the glass fiber layer.

[0036] Finally, by injecting polymer grouting material into the grouting cavity, the polymer grouting material adheres to the outer circumferential surface of the cracked pipe.

[0037] After the polymer grouting material cures and expands, the carbon fiber layer and glass fiber layer are under tensile stress. The carbon fiber layer constrains the cured and expanded polymer layer, and the expansion of the polymer grouting material applies prestress to the cracked pipe, putting the pipe under pressure. This inhibits the development of pipe cracks and reduces the stress at the crack tip, thereby significantly improving the pipe's load-bearing capacity and long-term service performance.

[0038] Meanwhile, after construction is completed, a hard outer shell is formed by the polymer curing layer, glass fiber layer and carbon fiber layer wrapped around the outside of the cracked pipe, thereby improving the overall structural strength and preventing leakage problems after the crack continues to crack. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the composite reinforcement structure;

[0040] Figure 2 This is a structural diagram of the construction tools;

[0041] Figure 3 This is a structural schematic diagram of the side panel;

[0042] In the diagram: 1. Limiting strip, 2. Carbon fiber layer, 3. Glass fiber layer, 4. Polymer curing layer, 5. Cracked pipe, 6. First side plate, 7. Second side plate, 8. First lead screw, 9. Limiting bolt, 10. Through hole, 11. Second lead screw, 12. Locking nut, 13. Upper plate, 14. Lower plate, 15. Pipe hole, 16. Grouting hole. Detailed Implementation

[0043] The present invention will be further described below with reference to the accompanying drawings and embodiments. Example 1

[0044] See Figures 1 to 3 A composite reinforcement structure for cracked pipes includes a polymer curing layer 4, a glass fiber layer 3, and a carbon fiber layer 2.

[0045] The polymer curing layer 4, glass fiber layer 3, and carbon fiber layer 2 are all cylindrical structures and are arranged in a sequential manner from the inside to the outside, wrapped around the cracked pipe 5.

[0046] The fiberglass layer 3 is composed of two semi-cylindrical structures joined together.

[0047] Among them, the polymer curing layer 4 is a cylindrical structure formed on the outside of the cracked pipe 5 after the polymer is cured.

[0048] Carbon fiber layer 2 is carbon fiber cloth impregnated with resin, which is cured to form carbon fiber layer 2. This carbon fiber layer 2 has the advantages of light weight, high strength and corrosion resistance.

[0049] The construction of a cylindrical structure by winding carbon fiber cloth impregnated with resin is convenient, and the construction process does not require high temperature and can be carried out under pressure, overcoming the shortcomings of traditional repair methods. Example 2

[0050] A composite reinforcement structure for cracked pipes includes a polymer curing layer 4, a glass fiber layer 3, and a carbon fiber layer 2.

[0051] The polymer curing layer 4, glass fiber layer 3, and carbon fiber layer 2 are all cylindrical structures and are arranged in a sequential manner from the inside to the outside, wrapped around the cracked pipe 5.

[0052] The fiberglass layer 3 is composed of two semi-cylindrical structures joined together.

[0053] This embodiment describes a construction tool for a composite reinforcement structure used in the cracked pipe 5 described in the previous embodiment. Specifically:

[0054] A construction tool for a composite reinforcement structure for a cracked pipe 5 includes a first side plate 6 and a second side plate 7 arranged in parallel.

[0055] The first side plate 6 and the second side plate 7 are respectively provided with pipe holes 15 that are adapted to the outer diameter of the cracked pipe 5 in the middle part, and a set of through holes 10 arranged in a ring are also provided on the outside of the pipe holes 15.

[0056] A first lead screw 8 is connected to two corresponding through holes 10 on the first side plate 6 and the second side plate 7 respectively. The two ends of the first lead screw 8 pass through the first side plate 6 and the second side plate 7 respectively and are threadedly connected to limit bolts 9.

[0057] On the opposite side of the first side plate 6 and the second side plate 7, there are also multiple circumferentially arranged limiting strips 1, which are supported between the cracked pipe 5 and the glass fiber layer 3 by the limiting strips 1, to form an annular grouting cavity for accommodating the polymer curing layer 4. The second side plate 7 is provided with grouting holes 16 that communicate with the grouting cavity. Example 3

[0058] A construction tool for a composite reinforcement structure for cracked pipes includes a first side plate 6 and a second side plate 7 arranged in parallel.

[0059] The first side plate 6 and the second side plate 7 are respectively provided with pipe holes 15 that are adapted to the outer diameter of the cracked pipe 5 in the middle part, and a set of through holes 10 arranged in a ring are also provided on the outside of the pipe holes 15.

[0060] A first lead screw 8 is connected to two corresponding through holes 10 on the first side plate 6 and the second side plate 7 respectively. The two ends of the first lead screw 8 pass through the first side plate 6 and the second side plate 7 respectively and are threadedly connected to limit bolts 9.

[0061] On the opposite side of the first side plate 6 and the second side plate 7, multiple circumferentially arranged limiting strips 1 are respectively placed, and are supported between the cracked pipe 5 and the glass fiber layer 3 by the circumferentially arranged limiting strips 1, in order to form an annular grouting cavity for accommodating the polymer curing layer 4.

[0062] The second side plate 7 is provided with a grouting hole 16 that communicates with the grouting cavity.

[0063] This embodiment is a further optimization based on embodiment 2, specifically:

[0064] The first side plate 6 and the second side plate 7 are rectangular structures. The number of through holes 10 on the first side plate 6 and the second side plate 7 is four. The first side plate 6 and the second side plate 7 both include an upper plate body 13 and a lower plate body 14 arranged symmetrically.

[0065] The first side plate 6 and the second side plate 7 are provided with vertical through grooves on both sides of the tube hole 15, which pass through the upper plate 13 and the lower plate 14. A second lead screw 11 is inserted into the through groove, and the two ends of the second lead screw 11 are respectively connected to locking nuts 12 that clamp and fix the upper plate 13 and the lower plate 14.

[0066] By making the first side plate 6 and the second side plate 7 into a split structure, it is easier to install on the outside of the cracked pipe 5 and is more suitable for some parts where the crack is far from the pipe opening. Example 4

[0067] A construction tool for a composite reinforcement structure for cracked pipes includes a first side plate 6 and a second side plate 7 arranged in parallel.

[0068] The first side plate 6 and the second side plate 7 are respectively provided with pipe holes 15 that are adapted to the outer diameter of the cracked pipe 5 in the middle part, and a set of through holes 10 arranged in a ring are also provided on the outside of the pipe holes 15.

[0069] A first lead screw 8 is connected to two corresponding through holes 10 on the first side plate 6 and the second side plate 7 respectively. The two ends of the first lead screw 8 pass through the first side plate 6 and the second side plate 7 respectively and are threadedly connected to limit bolts 9.

[0070] On the opposite side of the first side plate 6 and the second side plate 7, multiple circumferentially arranged limiting strips 1 are respectively placed, and are supported between the cracked pipe 5 and the glass fiber layer 3 by the circumferentially arranged limiting strips 1, in order to form an annular grouting cavity for accommodating the polymer curing layer 4.

[0071] The second side plate 7 is provided with a grouting hole 16 that communicates with the grouting cavity.

[0072] This embodiment is a further optimization based on embodiment 2, specifically:

[0073] The limiting strips 1 are all made of flexible materials, specifically plastic or rubber, and the thickness of the limiting strips 1 is 1.5-3.5mm.

[0074] The flexible material limiting strip 1 has a certain degree of elasticity, which allows it to fill more tightly between the cracked pipe and the glass fiber layer 3. Example 5

[0075] This embodiment describes a construction method for a composite reinforcement structure for cracked pipes, as described in the above embodiments, including the following steps:

[0076] Step 1: The outer surface of the cracked pipe 5 that needs reinforcement is sanded with sandpaper and then cleaned with alcohol.

[0077] Step 2: Attach the surrounding limiting strips 1 to the front and back sides of the area on the outer surface of the cracked pipe 5 that needs reinforcement.

[0078] Step 3: The two semi-cylindrical structures are joined together to form a cylindrical glass fiber layer 3, which is then placed over the outside of the cracked pipe 5. An annular grouting cavity is formed by the surrounding limiting strips 1 and the cylindrical glass fiber layer 3.

[0079] Step 4: The carbon fiber cloth impregnated with resin is wrapped in a ring around the outside of the glass fiber layer 3, and the carbon fiber layer 2 is formed after curing.

[0080] Step 5: Apply release agent to the opposite end faces of the first side plate 6 and the second side plate 7, then fit them onto the cracked pipe 5, and clamp the first side plate 6 and the second side plate 7 on both sides of the glass fiber layer 3 by tightening the limiting bolts 9.

[0081] Step 6: The polymer is injected into the grouting cavity through the grouting hole 16, and the polymer solidifies to form a polymer solidified layer 4.

[0082] Step 7: Remove the first side plate 6 and the second side plate 7 from the cracked pipe 5.

[0083] The present invention covers the outside of the cracked pipe with a cylindrical glass fiber layer 3, and then fills the space between the cracked pipe and the glass fiber layer 3 with a surrounding arrangement of limiting strips 1 to form an annular grouting cavity.

[0084] Carbon fiber cloth impregnated with resin is wrapped in a ring around the outside of glass fiber layer 3, and after curing, carbon fiber layer 2 is formed, which tightly wraps and fixes glass fiber layer 3.

[0085] Finally, by injecting polymer grouting material into the grouting cavity, the polymer grouting material adheres to the outer circumferential surface of the cracked pipe.

[0086] After the polymer grouting material cures and expands, the carbon fiber layer 2 and the glass fiber layer 3 are under tensile stress. The carbon fiber layer 2 constrains the cured and expanded polymer layer, and the expansion of the polymer grouting material applies prestress to the cracked pipe, which is then under pressure. This inhibits the development of pipe cracks and reduces the stress at the crack tip, thereby significantly improving the pipe's load-bearing capacity and long-term service performance.

[0087] Meanwhile, after construction is completed, a hard outer shell is formed by the polymer curing layer 4, glass fiber layer 3 and carbon fiber layer 2 wrapped around the outside of the cracked pipe, thereby improving the overall structural strength and preventing leakage problems after the crack continues to crack.

Claims

1. A construction tool for a composite reinforcement structure of cracked pipes, characterized in that: Includes a first side plate and a second side plate arranged in parallel; The first side plate and the second side plate are respectively provided with pipe holes in the middle that are adapted to the outer diameter of the cracked pipe, and a set of through holes arranged in a ring are also provided on the outside of the pipe holes. A first screw is connected to two through holes on the first side plate and the second side plate respectively in the axial direction. The two ends of the first screw pass through the first side plate and the second side plate respectively and are threaded with limit bolts. The composite reinforcement structure includes a polymer curing layer, a glass fiber layer, and a carbon fiber layer; The polymer curing layer, glass fiber layer and carbon fiber layer are all cylindrical structures and are arranged in a sequential manner from the inside to the outside, wrapped around the cracked pipe. On the opposite side of the first side plate and the second side plate, a plurality of circumferentially arranged limiting strips are respectively placed, and the circumferentially arranged limiting strips support the cracked pipe and the glass fiber layer, forming an annular grouting cavity for accommodating the polymer curing layer. The second side plate is provided with grouting holes that communicate with the grouting cavity.

2. The construction tool for the composite reinforcement structure of cracked pipes according to claim 1, characterized in that: Both the first side plate and the second side plate include an upper plate and a lower plate arranged symmetrically. The first side plate and the second side plate are respectively provided with vertical through grooves on both sides of the pipe hole, which penetrate the upper plate and the lower plate. A second lead screw is inserted into the through groove, and the two ends of the second lead screw are respectively connected to locking nuts that clamp and fix the upper plate and the lower plate.

3. The construction tool for the composite reinforcement structure of cracked pipes according to claim 1, characterized in that: The limiting strip is made of flexible material.

4. The construction tool for the composite reinforcement structure of cracked pipes according to claim 1, characterized in that: The limiting strip is made of plastic or rubber.

5. The construction tool for the composite reinforcement structure of cracked pipes according to claim 1, characterized in that: The thickness of the limiting strip is 1.5-3.5mm.

6. The construction tool for the composite reinforcement structure of cracked pipes according to claim 1, characterized in that: Both the first side plate and the second side plate are rectangular structures, and each of the first side plate and the second side plate has four through holes.

7. A construction method for a construction tool used in the composite reinforcement structure of the cracked pipe as described in claim 1, characterized in that: Includes the following steps: Step 1: Grind and clean the areas on the outer surface of the cracked pipe that require reinforcement. Step 2: Attach circumferentially arranged limiting strips to the front and back sides of the area on the outer surface of the cracked pipe that needs reinforcement; Step 3: The glass fiber layer, which is formed by assembling two semi-cylindrical structures into a cylindrical shape, is placed over the outside of the cracked pipe, and a grouting cavity is formed between the surrounding limiting strips, the glass fiber layer, and the cracked pipe. Step 4: The resin-impregnated carbon fiber cloth is wrapped in a ring around the outside of the glass fiber layer, and after curing, the carbon fiber layer is formed. Step 5: Apply release agent to the opposite end faces of the first side plate and the second side plate, then fit them onto the cracked pipe, and clamp the first side plate and the second side plate on both sides of the glass fiber layer by tightening the limiting bolts. Step 6: Inject the polymer into the grouting cavity through the grouting hole. After the polymer solidifies, it forms the polymer solidified layer. Step 7: Remove the first and second side plates from the cracked pipe.

8. A composite reinforcement structure for cracked pipes, characterized in that: It is produced by the construction method of claim 7; The composite reinforcement structure includes a polymer curing layer, a glass fiber layer, and a carbon fiber layer; The polymer curing layer, glass fiber layer, and carbon fiber layer are all cylindrical structures and are arranged in a sequential manner from the inside to the outside, wrapping around the cracked pipe.

9. A composite reinforcement structure for cracked pipes according to claim 8, characterized in that: The fiberglass layer is composed of two semi-cylindrical structures joined together. The carbon fiber layer is formed by wrapping resin-impregnated carbon fiber cloth around the outside of a glass fiber layer and then curing it. The polymer-cured layer is formed by curing polymer between the glass fiber layer and the cracked pipe.

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