Submarine vertical jacking riser joint water stop frame and construction method

Abstract

The application discloses a submarine vertical jacking riser pipe joint water stop frame and a construction method. The submarine vertical jacking riser pipe joint water stop frame comprises a water stop frame body arranged below a jacking opening and a water stop layer arranged on the inner side of the water stop frame body. A plurality of grouting holes are arranged around the circumferential side of the water stop frame body. The grouting holes are communicated between the inner and outer sides of the water stop frame body. Grouting valves are arranged at the grouting holes. When a jacking pipe joint passes through the jacking opening, the inner side of the water stop layer abuts against the outer side of the jacking pipe joint, and the gap between the outer side of the jacking pipe joint and the inner side of the water stop frame body is sealed. When the gap between the outer side of the jacking pipe joint and the inner side of the water stop frame body leaks, the grouting valves are opened, and grouting is performed on the inner side of the water stop frame body, so that the water stopping purpose is achieved. The application has the effect of improving the water leakage problem in the vertical jacking construction process.

Description

Technical Field

[0001] This application relates to the field of submarine pipeline engineering, and in particular to a waterstop frame for a submarine vertical lifting riser section and a construction method thereof. Background Technology

[0002] Subsea water intake tunnels are a crucial infrastructure component in coastal areas and island regions with unique geographical features. Traditional water intake methods, such as surface drilling and pumping stations, are costly to construct and maintain, making it difficult to meet the water resource demands of these areas. With technological advancements, subsea shield tunneling has emerged as a promising new method for water intake. This technology not only improves water intake efficiency but also reduces environmental impact, offering high safety and environmental friendliness. Especially in large-scale municipal engineering and water supply and drainage projects, the application of subsea shield tunneling is becoming increasingly widespread, proving to be an effective way to solve water resource problems in coastal areas.

[0003] Vertical jacking technology is widely used in the construction of subsea water intake tunnels. This technology uses a hydraulic system to push out the jacking cover at the jacking opening of the tunnel segment structure, and then gradually jacks it to the designed height, thereby achieving connection between the inside and outside of the tunnel. To prevent water and mud leakage from occurring in the gap between the tunnel segment and the jacking opening at the tunnel segment structure during the jacking process, the conventional method is to install a water-stop strip on the inside of the jacking opening. When the jacking tunnel segment passes through the jacking opening, the water-stop strip seals tightly against the outer wall of the jacking tunnel segment, thereby sealing the gap between the inside of the jacking opening and the outer wall of the jacking tunnel segment to achieve the water-stopping function.

[0004] However, existing waterstop strips have significant drawbacks in practical use. Specifically, during vertical jacking construction, as the pipe sections are continuously lifted, the waterstop strips are prone to wear and even breakage, leading to severe leakage. This problem seriously affects the safety and reliability of construction, thus requiring further improvements to enhance the waterstopping effect. Summary of the Invention

[0005] To improve the water leakage problem during vertical jacking construction, this application provides a water-stop frame for the vertical jacking riser section on the seabed and a construction method therefor.

[0006] The technical solution provided in this application for a waterstop frame and construction method for a vertically lifted subsea riser section is as follows:

[0007] A water-stop frame for a vertically jacking riser section on the seabed includes a water-stop frame body disposed below the jacking opening and a water-stop layer disposed inside the water-stop frame body. The water-stop frame body has several grouting holes around its perimeter, which connect to the inner and outer sides of the water-stop frame body. A grouting valve is installed at each grouting hole. When the jacking section passes through the jacking opening, the inner side of the water-stop layer presses against the outer side of the jacking section, sealing the gap between the outer side of the jacking section and the inner side of the water-stop frame body. When leakage occurs in the gap between the outer side of the jacking section and the inner side of the water-stop frame body, the grouting valve is opened, and grout is applied to the inner side of the water-stop frame body to achieve water-stopping.

[0008] By adopting the above technical solution, the waterstop frame for the vertically jacked riser section can effectively prevent water and mud leakage at the jacking opening during the jacking process. Specifically, the inner side of the waterstop layer is pressed tightly against the outer side of the jacking section, ensuring a tight fit between the jacking section and the inner side of the waterstop frame, effectively sealing the gap between them. In case of accidental leakage, the water stop can be quickly achieved by opening the grouting valve and injecting waterstop grout into the inner side of the waterstop frame. This emergency water stop measure is not only simple and quick to operate, but also effectively prevents safety hazards and construction delays caused by prolonged leakage, improving the safety and reliability of the overall construction process. At the same time, the grouting method can flexibly deal with leakage points of different locations and sizes, ensuring a more thorough and durable water stop effect.

[0009] Preferably, the waterstop layer includes a rubber ring and a plurality of oil-immersed packing rings, which are all arranged around the inner side of the waterstop frame body and distributed from top to bottom.

[0010] By adopting the above technical solution, the combined use of rubber rings and several oil-immersed packing rings can effectively enhance the overall sealing performance of the waterproofing layer. The rubber ring, as the primary initial sealing material, can first form a preliminary seal when the jacking pipe section passes through the jacking opening, preventing a large amount of water and sediment from entering the gap. The oil-immersed packing further strengthens the sealing effect, especially under prolonged use or high pressure conditions. The oil-immersed packing can better adapt to changes in the outer wall of the jacking pipe section, ensuring a long-term reliable sealing effect. At the same time, this multi-layered design also improves the system's reliability; even if one layer fails, the other layers can continue to perform their waterproofing function, thus significantly reducing the risk of leakage.

[0011] Preferably, an adjusting pressure plate is provided at the bottom of the waterstop frame body. The inner side of the adjusting pressure plate protrudes from the inner side of the waterstop frame body. A vertically upward adjusting bolt is threaded to the protruding part of the adjusting pressure plate. The adjusting bolt is located below several oil-immersed packings and is used to press the oil-immersed packings upward.

[0012] By adopting the above technical solution, the design of the adjusting pressure plate and adjusting bolts enables the oil-immersed packing to maintain good sealing performance during the jacking process. Specifically, the adjusting bolts can adjust the compression of the oil-immersed packing, ensuring that it always fits tightly against the outer wall of the jacking pipe section, effectively preventing water leakage caused by wear during the jacking process. At the same time, the protruding design of the adjusting pressure plate increases the stability of the oil-immersed packing, further improving the water-stopping effect.

[0013] Preferably, the bottom of the oil-immersed packing is provided with a packing strip, and the adjusting bolt is used to press the oil-immersed packing against the packing strip by pushing it upward.

[0014] By adopting the above technical solution, a packing strip is installed at the bottom of the oil-immersed packing. The adjusting bolts tighten the oil-immersed packing by pushing the packing strip upwards. This design effectively enhances the sealing performance of the oil-immersed packing, preventing leakage caused by deformation or wear of the packing itself, and further improving the overall reliability and service life of the waterstop frame. Simultaneously, by adjusting the pressure of the adjusting bolts on the packing strip, the tightness of the oil-immersed packing can be flexibly adjusted during construction, ensuring good sealing performance under different working conditions.

[0015] Preferably, a stop block is provided on the inner side of the waterstop frame body, the stop block being located between the rubber ring and the oil-immersed packing to separate the rubber ring and the oil-immersed packing.

[0016] By adopting the above technical solution, the stop block separates the rubber ring and the oil-impregnated packing, effectively preventing them from affecting each other during use and ensuring their respective waterproofing performance. Specifically, the stop block can avoid wear or deformation caused by friction between the rubber ring and the oil-impregnated packing, thereby extending the overall service life of the waterproofing layer and improving its sealing reliability. At the same time, the presence of the stop block allows the rubber ring and the oil-impregnated packing to better maintain their respective positions and shapes under stress, further enhancing the waterproofing effect.

[0017] A construction method for a waterstop frame for a vertically lifted subsea riser section includes the following steps:

[0018] S1: Waterstop frame installation: Set a waterstop layer inside the waterstop frame body and open grouting holes around the waterstop frame body. Install the waterstop frame body below the jacking port of the segment structure, and then connect the top of the jacking pipe section to the bottom of the jacking pipe cover at the jacking port.

[0019] S2: Vertical jacking construction: The jacking pipe section pushes the jacking pipe cover upward out of the jacking opening. The jacking pipe section passes through the jacking opening. The inner side of the waterstop layer inside the waterstop frame body is pressed against the outer side of the jacking pipe section, and the gap between the outer side of the jacking pipe section and the inner side of the waterstop frame body is sealed.

[0020] S3: Emergency water-stopping construction: When water leakage occurs in the gap between the outer side of the jacking pipe section and the inner side of the water-stop frame body, the water-stopping purpose is achieved by opening the grouting valve and injecting water-stopping grout into the inner side of the water-stop frame body.

[0021] By adopting the above technical solution, the water-stop layer inside the water-stop frame can tightly adhere to the outside of the jacking pipe section when it passes through the jacking opening, effectively sealing the gap between them and preventing water and mud leakage. Simultaneously, the design of the grouting holes and grouting valves allows for rapid injection of water-stopping grout in case of leakage, further enhancing the water-stopping effect and ensuring the safety and reliability of the construction process. Furthermore, the water-stop layer consists of rubber rings and oil-immersed packing, with multiple sealing measures improving the overall water-stopping performance. The adjustment bolts and packing strips allow for adjustment of the pressure of the oil-immersed packing as needed, ensuring it is always in optimal working condition and avoiding leakage problems caused by wear. The use of blocks separates the water-stop layers of different materials, ensuring that their respective functions are not interfered with. In summary, this technical solution significantly improves the reliability and effectiveness of water-stopping for subsea vertical jacking riser pipe sections.

[0022] Preferably, in S1, the top of the lifting pipe section and the bottom of the pipe cover are connected by a flange, and a wooden pad is provided in the groove on the outside of the flange. The outside of the wooden pad is flush with the outer wall of the lifting pipe section, and the outside of the wooden pad is pressed against the inner side of the waterstop layer.

[0023] By adopting the above technical solution, the flange connection between the top of the jacking pipe section and the bottom of the jacking pipe cover enhances the overall stability and sealing performance of the structure. The wooden pads placed in the groove on the outside of the flange keep the outer wall of the jacking pipe section flat, which helps to reduce the wear of the components on the waterstop layer during vertical jacking.

[0024] Preferably, in the emergency water-stopping construction of S3, the water-stopping grout is polyurethane.

[0025] By adopting the above technical solution, using polyurethane as the waterproofing grout can effectively improve waterproofing performance. Polyurethane has good adhesion and elasticity, and can cure rapidly in a short time to form a dense waterproofing layer, preventing water penetration. At the same time, polyurethane material also has excellent chemical corrosion resistance and aging resistance, ensuring long-term stable operation in complex marine environments and extending the service life of the waterproofing frame.

[0026] In summary, this application includes at least one of the following beneficial technical effects:

[0027] 1. By setting a water-stop layer on the inner side of the water-stop frame body and utilizing a multi-layer sealing structure of rubber rings and oil-immersed packing, the water-stopping performance during the jacking process is effectively improved, and the risk of leakage caused by wear or breakage of the water-stop strip is reduced.

[0028] 2. The design of the grouting holes and grouting valves allows for the rapid sealing of leaks by injecting grout into the inner side of the waterstop frame when gaps occur during the jacking process, enhancing emergency response capabilities and ensuring construction safety.

[0029] 3. The combination design of the adjusting pressure plate and adjusting bolts can dynamically adjust the pressure of the oil-immersed packing, ensuring that it always fits tightly against the outer wall of the jacking pipe section, further improving the reliability and stability of long-term use. Attached Figure Description

[0030] Figure 1 This is a plan sectional view of the waterstop frame in a waterstop frame of a vertical lifting riser section of the seabed, according to an embodiment of this application.

[0031] Figure 2 yes Figure 1 A schematic diagram showing the connection between the water-stop frame body and the jacking cover at the longitudinal section AA.

[0032] Explanation of reference numerals in the attached drawings: 1. Waterstop frame body; 2. Segment structure; 3. Jacking pipe cover; 4. Jacking port; 5. Flange; 6. Wooden pad; 7. Jacking pipe section; 8. Rubber ring; 9. Stop block; 10. Oil-immersed packing; 11. Adjusting pressure plate; 12. Adjusting bolt; 13. Packing strip; 14. Grouting valve; 15. Grouting hole. Detailed Implementation

[0033] The following is in conjunction with the appendix Figure 1-2 This application will be described in further detail.

[0034] This application discloses a waterstop frame for a submarine vertical lifting riser section, referring to... Figure 1 and Figure 2 The system includes a waterstop frame body 1 installed and fixed below the jacking opening 4 of the segment structure 2, and a waterstop layer surrounding and covering the inner side of the waterstop frame body 1. Several grouting holes 15 are opened around the waterstop frame body 1, connecting the inner and outer sides of the waterstop frame body 1. A grouting valve 14 is installed at each grouting hole 15. When the jacking segment 7 passes through the jacking opening 4, the inner side of the waterstop layer presses against the outer side of the jacking segment 7, sealing the gap between the outer side of the jacking segment 7 and the inner side of the waterstop frame body 1. When leakage occurs in the gap between the outer side of the jacking segment 7 and the inner side of the waterstop frame body 1, the grouting valve 14 is opened, and waterstop grout is injected into the inner side of the waterstop frame body 1 to achieve the purpose of water stoppage, thereby improving the water stoppage effect and reducing the risk of leakage.

[0035] Specifically, the waterstop frame body 1 is a rectangular metal frame, which can be made of high-strength stainless steel or aluminum alloy to ensure its corrosion resistance and strength in seawater. During installation, the top surface of the waterstop frame body 1 is welded to the lower edge of the lifting opening 4 of the segment structure 2. The weld height is 10mm, the weld is straight with the inner wall of the waterstop frame body 1, and watertight treatment is performed. Alternating welding is used to prevent deformation. Additionally, stiffening plates are welded around the outer perimeter of the waterstop frame body 1 and firmly welded to the segment structure 2.

[0036] The water-stop layer includes a rubber ring 8 and several oil-impregnated packing rings 10. The rubber ring 8 is arranged around the inner side of the water-stop frame body 1 and is located at the top, serving as a preliminary seal. The oil-impregnated packing rings 10 are distributed below the rubber ring 8, and their number can be adjusted according to actual needs, for example, three or five. The oil-impregnated packing rings 10 are made of cotton yarn soaked in grease, which has good lubrication and sealing properties, and can effectively prevent water seepage during the jacking process.

[0037] In this embodiment, an adjusting pressure plate 11 is provided at the bottom of the waterstop frame body 1. The inner side of the adjusting pressure plate 11 protrudes from the inner side of the waterstop frame body 1, and a vertically upward adjusting bolt 12 is threadedly connected to the protruding part of the adjusting pressure plate 11. The adjusting bolt 12 is located below several oil-immersed packings 10 and is used to press the oil-immersed packings 10 upward. This allows the pressure to be dynamically adjusted as needed during the jacking process, ensuring that the oil-immersed packings 10 are always in the best sealing state.

[0038] In this embodiment, the oil-immersed packing 10 has a packing strip 13 at its bottom, and the adjusting bolt 12 presses the oil-immersed packing 10 against the packing strip 13 upwards. The packing strip 13 is generally made of metal and its surface is treated with anti-corrosion coating to extend its service life. Alternatively, plastic or composite materials can also be used to reduce weight and lower costs.

[0039] An annular stop block 9 is arranged around the inner side of the waterstop frame body 1. The stop block 9 is located between the rubber ring 8 and the oil-impregnated packing 10 to separate the rubber ring 8 and the oil-impregnated packing 10, effectively preventing them from affecting each other during use and ensuring their respective waterstop performance. The stop block 9 can be made of rigid plastic or metal, and its shape can be circular or square, with a thickness of about 10mm to ensure sufficient rigidity and stability.

[0040] The implementation principle of this embodiment is as follows:

[0041] The subsea vertical jacking riser section waterstop frame significantly improves the water-stopping effect through multi-layered water-stopping measures. First, the rubber ring 8 serves as the first line of defense, quickly forming a preliminary seal. Second, the oil-immersed packing 10 serves as the second line of defense, continuously providing sealing force during the jacking process. Then, by dynamically adjusting the adjusting bolts 12 and the packing strip 13, a stable sealing effect is ensured throughout the jacking process. This design not only effectively solves the problem of easy wear and breakage of traditional waterstop strips, but also allows for rapid water-stopping in case of unexpected leakage by opening the grouting valve 14 and injecting water-stopping grout into the inside of the waterstop frame body 1. This emergency water-stopping measure is not only simple and quick to operate, but also effectively prevents safety hazards and construction delays caused by prolonged leakage, improving the overall safety and reliability of the construction process. Simultaneously, the grouting method can flexibly address leak points of different locations and sizes, ensuring a more thorough and durable water-stopping effect, greatly reducing the risk of leakage and improving the reliability and safety of the entire system.

[0042] The construction method for the waterstop frame of the subsea vertical lifting riser section provided in this application embodiment includes the following steps:

[0043] S1: Waterstop Frame Installation. First, install and fix the waterstop layer inside the waterstop frame body 1. Then, install the waterstop frame body 1 below the jacking opening 4 of the segment structure 2, ensuring that the horizontal and verticality of the waterstop frame body 1 meet the design requirements. Finally, connect the top of the jacking pipe section 7 to the bottom of the jacking pipe cover 3 at the jacking opening 4. The connection method can be a flange 5. Use wooden blocks 6 and quick-setting waterproof cement to smooth the groove on the outside of the flange 5. The outside of the wooden blocks 6 should be flush with the outer wall of the jacking pipe section 7, and the outside of the wooden blocks 6 should be pressed tightly against the inside of the waterstop layer. The outer wall of the jacking pipe section 7 and the joints should also be coated. The wooden blocks 6, quick-setting waterproof cement, and coatings and other fillers make the surface of the entire jacking structure smooth and flat, reducing wear on the waterstop layer during the jacking process.

[0044] S2: Vertical Lifting Construction. Before starting the lifting construction, check that all components are installed correctly. After confirming that everything is in order, start the hydraulic device to slowly raise the lifting pipe section 7 until the jacking pipe cover 3 is completely detached from the jacking opening 4. During this process, the lifting pipe section 7 passes through the jacking opening 4, and the inner side of the waterstop layer on the inner side of the waterstop frame body 1 presses tightly against the outer side of the lifting pipe section 7, forming a tight seal. At this time, observe whether there is any leakage. If necessary, the lifting speed can be adjusted appropriately or the position of the waterstop layer can be readjusted.

[0045] S3: Emergency waterproofing construction

[0046] When leakage occurs at the gap between the outer side of the jacking pipe section 7 and the inner side of the waterstop frame body 1, the jacking device should be immediately shut off, and the grouting valve 14 should be opened to prepare for the injection of waterstop grout. Polyurethane is a commonly used waterstop grout because of its excellent expansion properties and short curing time, allowing it to quickly fill gaps and solidify, thus achieving the purpose of water stoppage. During the injection process, ensure that the grouting valve 14 is unobstructed to avoid blockage. After injection, close the grouting valve 14 and check the water stoppage effect again. Only after confirming there is no leakage should the jacking construction continue.

[0047] The implementation principle of this embodiment is as follows:

[0048] Through detailed construction steps and technical points, this embodiment ensures strict control over every aspect of the installation and jacking process of the waterstop frame. First, a sound foundation is laid through the reasonable setting of the waterstop layer and the arrangement of the grouting holes 15. Second, rigorous installation and commissioning procedures guarantee the precise fit of each component. Finally, effective emergency water-stopping measures ensure timely remediation in case of unforeseen circumstances. This series of optimized designs not only improves construction efficiency but also significantly reduces construction risks, ensuring the quality and safety of the entire project.

[0049] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A waterstop frame for a vertically lifted seabed riser section, characterized in that: It includes a water-stop frame body (1) set below the jacking port (4) and a water-stop layer set inside the water-stop frame body (1). The water-stop frame body (1) has several grouting holes (15) around its perimeter. The grouting holes (15) are connected to the inner and outer sides of the water-stop frame body (1). A grouting valve (14) is set at the grouting hole (15). When the jacking pipe section (7) passes through the jacking port (4), the inner side of the water-stop layer is pressed against the outer side of the jacking pipe section (7) and seals the gap between the outer side of the jacking pipe section (7) and the inner side of the water-stop frame body (1). When water leakage occurs in the gap between the outer side of the jacking pipe section (7) and the inner side of the water-stop frame body (1), the grouting valve (14) is opened and water-stop grout is injected into the inner side of the water-stop frame body (1) to achieve the purpose of water-stopping. The waterstop layer includes a rubber ring (8) and several oil-immersed packing (10). The rubber ring (8) and several oil-immersed packing (10) are arranged around the inner side of the waterstop frame body (1) and distributed from top to bottom. The bottom of the waterstop frame body (1) is provided with an adjusting pressure plate (11). The inner side of the adjusting pressure plate (11) protrudes from the inner side of the waterstop frame body (1). The protruding part of the adjusting pressure plate (11) is threaded with an adjusting bolt (12) that is set vertically upward. The adjusting bolt (12) is located below several oil-immersed packings (10). The adjusting bolt (12) is used to press the oil-immersed packings (10) upward. The bottom of the oil-immersed packing (10) is provided with a packing strip (13), and the adjusting bolt (12) presses against the oil-immersed packing (10) by pushing the packing strip (13) upward; A stop block (9) is provided on the inner side of the waterstop frame body (1). The stop block (9) is located between the rubber ring (8) and the oil-immersed packing (10) to separate the rubber ring (8) and the oil-immersed packing (10).

2. A construction method for a waterstop frame for a vertically lifted subsea pipe section as described in claim 1, characterized in that, Includes the following steps: S1: Waterstop frame installation: Set a waterstop layer inside the waterstop frame body and open grouting holes around the waterstop frame body. Install the waterstop frame body below the jacking port of the segment structure, and then connect the top of the jacking pipe section to the bottom of the jacking pipe cover at the jacking port. S2: Vertical jacking construction: The jacking pipe section pushes the jacking pipe cover upward out of the jacking opening. The jacking pipe section passes through the jacking opening. The inner side of the waterstop layer inside the waterstop frame body is pressed against the outer side of the jacking pipe section, and the gap between the outer side of the jacking pipe section and the inner side of the waterstop frame body is sealed. S3: Emergency water-stopping construction: When water leakage occurs in the gap between the outer side of the jacking pipe section and the inner side of the water-stop frame body, the water-stopping purpose is achieved by opening the grouting valve and injecting water-stopping grout into the inner side of the water-stop frame body.

3. The construction method of the waterstop frame for the vertically lifted seabed riser section according to claim 2, characterized in that: In S1, the top of the lifting pipe section (7) is connected to the bottom of the pipe cover (3) by a flange (5). A wooden block (6) is set in the groove on the outside of the flange (5). The outside of the wooden block (6) is flush with the outer wall of the lifting pipe section (7), and the outside of the wooden block (6) is pressed against the inside of the waterstop layer.

4. The construction method of the waterstop frame for the vertically lifted seabed riser section according to claim 2, characterized in that: In the emergency water-stopping construction of S3, the water-stopping grout is polyurethane.

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