Anti-scour construction process for offshore structure foundation

Abstract

The invention discloses an anti-scour construction process for an offshore structure foundation, which comprises the following steps of: 1, scanning and marking a scour pit construction range; 2, manufacturing an anti-scour material pouring device; 3, a filling pump is connected with a filling hose, the filling hose is connected with a filling hard pipe through a universal joint, the filling hard pipe is connected vertically from the ship edge to the upper portion of the seabed mud surface by 2-5 m, the upper portion of the filling hard pipe is hung by a crane, a camera with a cable is fixed to the bottom of the hard pipe, the filling hard pipe is sleeved with a cellular board, and the cellular board naturally falls to the scouring position; 4, judging a scour area through a camera, and pouring an anti-scour material into the scour area, 5, repeating the step 4 until the position of a scour pit is filled with the cellular board, and the anti-scour material is poured to cover the whole scour pit area, 6, waiting for the anti-scour material in contact with the cellular board to be bonded with the cellular board, 7, recovering the tool, and 5, carrying out inspection. And the process plays a role in protecting the offshore structure foundation, and the waste of materials is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore construction foundations, and in particular to an anti-scouring construction process for offshore structure foundations. Background Art

[0002] Offshore structures refer to man-made structures held at sea. Our offshore structure installation services include the installation of large components such as offshore jackets and modules, as well as the design, manufacture, and installation of smaller structures such as tee protection frames.

[0003] However, existing methods for protecting offshore structures from scour mainly rely on three methods: 1. riprap; 2. silt-stabilized soil; and 3. bionic aquatic plants. The construction process for silt-stabilized soil is relatively simple and crude, typically using vessels to directly dump or pour silt-stabilized soil and other scour-proof materials into the target area. This method is relatively crude, requiring significant material waste to achieve full coverage of the target area. Furthermore, the material is exposed to a large underwater area, and its bonding state is unknown. If the material is washed away by waves before it bonds with the seabed sediment, this results in ineffective construction and material waste. Summary of the Invention

[0004] The purpose of the present invention is to provide an anti-scouring construction process for offshore structure foundations to solve the above technical problems.

[0005] To achieve the above object, the present invention provides the following technical solution: a construction process for anti-scour of offshore structure foundation, comprising the following steps: Step 1: Use scanning equipment to conduct seabed scanning of offshore structures to preliminarily determine the scope of scour pit construction; Step 2: After the construction vessel moves to the construction location, an anti-scour material pouring device is manufactured according to the construction range of the scour pit, and the anti-scour material pouring device covers the scour pit location flatly.

[0006] The anti-scour material pouring device includes a pouring device body, which includes a sleeve structure arranged in the center of the pouring device body and a plurality of honeycomb panels arranged on the circumferential side of the sleeve structure. A sleeve hole for receiving a pouring pipe is provided in the sleeve structure, and a protective cover is also provided on the outside of the honeycomb panel.

[0007] Step 3: Prepare the anti-scour material, grouting equipment, grouting hose, grouting pipe, grouting pump, and anti-scour material grouting device on the construction vessel. Connect the grouting pump to the grouting hose, and then connect the grouting pipe through a universal joint. The grouting pipe (the grouting pipes are connected by threads or welding, without large diameter changes or flanges) is connected straight up and down from the edge of the ship to 2-5 meters above the seabed mud surface. Use a crane to lift the upper part of the grouting pipe and fix the camera with a cable to the bottom of the pipe. The honeycomb panel is wrapped around the grouting pipe and naturally falls to the scour position. The side of the honeycomb panel can be cut, inserted, and roughly restored to its original shape, and then naturally falls to the grouting area.

[0008] Step 4: Use the camera to check whether the location of the injection pipe outlet is a scouring area. If it is a scouring area, inject the anti-scouring material to cover the scouring area. The anti-scouring material is injected onto the honeycomb plate and sinks to the seabed mud surface through the honeycomb gap until the anti-scouring material completely covers the scouring pit. If it is not a scouring area, the crane's boom moves, and the injection hard pipe follows the movement and is adjusted until the camera observes the corresponding scouring area. Then inject the anti-scouring material to cover the scouring area. The anti-scouring material is injected onto the honeycomb plate and sinks to the seabed mud surface through the honeycomb gap until the anti-scouring material completely covers the scouring pit.

[0009] Step 5: Repeat step 4 until the scour pits in the honeycomb panel are fully filled, and the anti-scour material is poured to cover the entire scour pit area.

[0010] Step 6: Wait for one to two hours and observe through the camera that the anti-scour material will be bonded with the seabed mud and sand. At the same time, the anti-scour material in contact with the honeycomb panel will be bonded with the honeycomb panel to form a complete bonded covering surface covering the scour pit.

[0011] Step 7: Recover the grouting equipment, grouting pipelines, and grouting pumps to the construction vessel, and drive the vessel away from the construction site.

[0012] Preferably, in step 1, a scanning device is used for scanning, and the scanning device is a multi-beam scanning instrument, which returns data to the engine room of the construction vessel after scanning.

[0013] Preferably, the perfusion hard pipe in step three is a long steel pipe, a universal joint for connecting a perfusion hose is welded on the long steel pipe, the sleeve hole is used to insert the connecting long steel pipe, and a fixing ring is also provided on the sleeve hole for assisting in fixing the long steel pipe.

[0014] Preferably, the honeycomb panel and the sleeve structure are both made of degradable materials.

[0015] Preferably, the density of the sleeve structure and the honeycomb panel are both greater than the density of seawater.

[0016] Preferably, the diameter of the sleeve hole is 100 mm-120 mm.

[0017] Preferably, the nozzle of the perfusion hard tube is designed to be trumpet-shaped.

[0018] Preferably, the anti-scour material is composed of cement, fly ash, cellulose, silica fume and curing agent material.

[0019] Compared with the prior art, the present invention has the following beneficial effects: 1. Accurate seabed scanning and positioning ensure the accuracy of anti-scour construction, reducing material waste and construction time; 2. The design of the anti-scour material pouring device makes the material pouring more uniform and efficient. By designing the honeycomb panel and casing structure, the honeycomb panel will flatly cover the scour pit. The anti-scour material is poured onto the honeycomb panel and sinks to the seabed mud surface through the honeycomb gap until the anti-scour material completely covers the scour pit. The honeycomb panel and anti-scour components have a certain turbulence effect. The surge will not immediately wash away the anti-scour material. The anti-scour material can be bonded with the seabed mud. At the same time, the anti-scour material in contact with the honeycomb panel is bonded to the honeycomb panel to form a complete bonded cover, covering the scour pit and protecting the foundation. It can improve the effectiveness of anti-scour material pouring and reduce material waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 This is a step diagram of a construction process for preventing scour of an offshore structure foundation according to this embodiment; Figure 2 This is a construction diagram of an anti-scour construction process for an offshore structure foundation according to this embodiment; Figure 3 Schematic diagram of the structure of the perfusion device body of this embodiment; In the accompanying drawings, the components represented by the reference numerals are as follows: 1. Construction vessel; 2. Anti-scour material pouring device; 3. Pouring device body; 4. Casing structure; 5. Honeycomb panel; 6. Casing hole; 16. Protective cover; 17. Pouring hose; 18. Pouring pipe; 19. Pouring pump; 20. Universal joint; 21. Camera; 22. Fixing ring. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0023] See also Figure 1-3 The present invention provides a technical solution: a construction process for preventing scour of offshore structure foundation, comprising the following steps: Step 1: Use scanning equipment to conduct seabed scanning of offshore structures to preliminarily determine the scope of scour pit construction; In the above steps, a scanning device is used for scanning, and the scanning device is a multi-beam scanning instrument. After scanning, the data is returned to the engine room of the construction vessel 1.

[0024] Step 2: After the construction vessel 1 moves to the construction location, an anti-scour material pouring device 2 is manufactured according to the construction range of the scour pit, and the anti-scour material pouring device 2 covers the scour pit location.

[0025] The anti-scour material pouring device 2 includes a pouring device body 3, which includes a sleeve structure 4 arranged in the center of the pouring device body 3 and a plurality of honeycomb panels 5 arranged on the periphery of the sleeve structure 4. A sleeve hole 6 for receiving the pouring pipe is provided in the sleeve structure 4, and a protective cover 16 is also provided on the outside of the honeycomb panel 5.

[0026] Specifically, the protective cover 16 is a cylindrical structure, and its inner diameter is slightly larger than the outer diameter of the injection device body 3. The upper end of the protective cover 16 is flush with the upper end of the sleeve structure 4, and its lower end extends to the bottom of the honeycomb panel 5. By setting the protective cover 16 as a cylindrical structure and extending its lower end to the bottom of the honeycomb panel 5, while ensuring that its inner diameter is slightly larger than the outer diameter of the injection device body 3, the injection device can be effectively protected from direct impact of waves and water currents in severe sea conditions.

[0027] Step 3: Prepare the anti-scour material, grouting equipment, grouting hose 17, grouting hard pipe 18, grouting pump 19, and anti-scour material grouting device 2 on the construction vessel 1. The grouting pump 19 is connected to the grouting hose 17, and the grouting hose 17 is connected to the grouting hard pipe 18 through the universal joint 20. The grouting hard pipe 18 (the grouting hard pipes 18 are connected by threads or welding, without large diameter changes or flanges) is connected straight up and down from the edge of the ship to 2-5 meters above the seabed mud surface. The crane lifts the upper part of the grouting hard pipe 18, and fixes the camera 21 with a cable to the bottom of the hard pipe. The honeycomb panel 5 is covered with the grouting hard pipe 18 and naturally falls to the scour position. The side of the honeycomb panel 5 can be cut, put in, and roughly restored to its original state, and naturally falls to the grouting area.

[0028] Specifically, the diameter of the casing hole 6 is 100mm-120mm, and a fixing ring 22 for assisting in fixing the perfusion pipe is provided on the casing hole 6. By providing the fixing ring 22, the perfusion hard pipe 18 is more stably connected to the casing hole 6, preventing the perfusion hard pipe 18 from shaking violently or falling out of the casing hole 6 due to the impact of seawater.

[0029] Step 4: Use the camera 21 to see whether the location of the outlet of the perfusion pipe is a scouring area. If it is a scouring area, the anti-scouring material is poured to cover the scouring area. The anti-scouring material is poured onto the honeycomb panel 5 and sinks to the seabed mud surface through the honeycomb gap until the anti-scouring material completely covers the scouring pit; if it is not a scouring area, the crane's boom moves and the perfusion hard pipe 18 follows the movement and is adjusted until the camera 21 observes the corresponding scouring area, and then the anti-scouring material is poured to cover the scouring area. The anti-scouring material is poured onto the honeycomb panel 5 and sinks to the seabed mud surface through the honeycomb gap until the anti-scouring material completely covers the scouring pit.

[0030] Specifically, the cable of the camera 5 should start from the top of the perfusion hard tube 18 to the bottom of the perfusion hard tube 18, and the cable must not affect the insertion and falling of the honeycomb panel 5 into the perfusion hard tube 18, and is also fixed inside the perfusion hard tube 18. It should be noted that the camera 5 will not affect the falling of the honeycomb panel 5. The hole in the middle of the honeycomb panel 5 can be set with a bevel chamfer to play a diversion role, so that it is not easy to get stuck during the falling process.

[0031] Specifically, the anti-scour material is composed of the above-mentioned materials such as cement, fly ash, cellulose, silica fume and curing agent, so that the anti-scour material can be bonded with the seabed mud and sand. Materials such as water reducers can also be added to enhance the use effect of the anti-scour material. At the same time, the anti-scour material in contact with the honeycomb panel 5 is bonded with the honeycomb panel 5 to form a complete bonded covering surface, covering the scour pit and protecting the foundation.

[0032] Step 5: Repeat step 4 until the scour pits in the honeycomb panel 5 are fully filled, and the anti-scour material is poured to cover the entire scour pit area.

[0033] Step 6: Wait for one to two hours and observe through the camera 21 that the anti-scour material can be bonded with the seabed mud and sand. At the same time, the anti-scour material in contact with the honeycomb panel 5 is bonded with the honeycomb panel 5 to form a complete bonded covering surface covering the scour pit.

[0034] Step 7: Recover the grouting equipment, grouting pipelines, and grouting pump 19 to the construction vessel 1, and drive the vessel away from the construction site.

[0035] Furthermore, in step three, the perfusion hard pipe 18 is a long steel pipe, on which a universal joint 20 for connecting the perfusion hose 17 is welded, and the sleeve hole 6 is used to insert the connecting long steel pipe, and the sleeve hole 6 is also provided with a fixing ring 22 for assisting in fixing the long steel pipe.

[0036] Specifically, the honeycomb panel 5 and the sleeve structure 4 are both made of degradable materials, such as polylactic acid material, chitosan material and DPA material, which can be degraded in the ocean and then corroded in the seawater and eventually disappear.

[0037] Furthermore, the density of the sleeve structure 4 and the honeycomb panel 5 is greater than the density of seawater. The sleeve structure 4 and the honeycomb panel 5 naturally sink to the seabed. The density of the polylactic acid material is 1.28g / cm3, the density of the DPA material is 1.6g / cm3, and the density of the chitosan material is 1.35~1.75g / cm3, all of which are higher than the density of seawater.

[0038] Specifically, the nozzle of the perfusion hard pipe 18 is designed to be trumpet-shaped. The trumpet-shaped design of the nozzle of the perfusion hard pipe 18 can further increase the coverage area of ​​the anti-scour material.

[0039] A specific application example of this embodiment is: The priming pump 19 is connected to the priming hose 17, which is then connected to the priming tube 18 via a universal joint 20. The priming tube 18 is connected straight up and down from the edge of the ship to 2-5 meters above the seabed mud surface. The outlet of the tube can be a micro-flare to increase the coverage area of ​​the anti-scour material. The center of the casing hole 6 is a round hole, which is used to enclose the priming tube 18 and naturally fall to the scour pit position. A camera 21 with a cable is fixed to the bottom of the priming tube 18 so that it can be seen at any time whether the priming tube outlet is located in the scour pit area. The crane is used to lift the upper part of the priming tube 18. As the boom moves, the target priming area and position can be adjusted during the priming or lowering of the honeycomb panel 5, so that the honeycomb panel 5 is fully covered in the scour pit position, and the anti-scour material is poured into and covered in the scour pit area to ensure that it is evenly laid. During the priming process, the operator can observe the priming situation in real time through the monitoring camera 21 to ensure that the anti-scour material accurately covers the scour pit area. When the grouting is completed, the crane slowly lifts the grouting pipe 18 while keeping the grouting pipe mouth aligned with the scouring pit to prevent the grouting material from overflowing or being unevenly distributed.

[0040] The casing hole 6 can also be cut according to actual needs. At the same time, the structural shape of the honeycomb panel 5 can be cut. According to the size of the scour pit, multiple pieces can be covered until the target area is fully covered, and then the anti-scour material is poured.

[0041] In the description of the present invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends", etc., indicating orientations or positional relationships, are orientations or positional relationships based on the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0042] In the present invention, unless otherwise clearly stipulated and limited, the terms "install", "set", "connect", "fix", "screw" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0043] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes may be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A construction process for preventing scour of offshore structure foundation, characterized in that The following steps are involved: Step 1: Use scanning equipment to conduct seabed scanning of offshore structures to preliminarily determine the construction scope of the scouring pit and mark it; Step 2: After the construction vessel (1) moves to the construction location, an anti-scour material pouring device (2) is manufactured according to the construction range of the scour pit, and the anti-scour material pouring device (2) covers the scour pit location flatly; The anti-scour material pouring device (2) comprises a pouring device body (3), the pouring device body (3) comprises a sleeve structure (4) arranged at the center of the pouring device body (3) and a plurality of honeycomb panels (5) arranged on the periphery of the sleeve structure (4), a sleeve hole (6) for receiving a pouring pipe is arranged in the sleeve structure (4), and a protective cover (16) is further arranged on the outside of the honeycomb panel (5), and the side of the honeycomb panel (5) can be cut open, inserted, and roughly restored to its original shape, and naturally fall to the pouring area; Step 3: Prepare the anti-scouring material, grouting equipment, grouting hose (17), grouting hard pipe (18), grouting pump (19), and anti-scouring material grouting device (2) on the construction vessel (1). The grouting pump (19) is connected to the grouting hose (17). The grouting hose (17) is connected to the grouting hard pipe (18) through the universal joint (20). The grouting hard pipe (18) (the grouting hard pipes (18) are connected by threaded connection or welding, without large diameter change or flange) and are connected straight up and down from the edge of the ship to 2-5 meters above the seabed mud surface. The crane hoists the upper part of the grouting hard pipe (18), fixes the camera (21) with a cable to the bottom of the hard pipe, and the honeycomb panel (5) covers the grouting hard pipe (18) and naturally falls to the scouring position. Step 4: Use the camera (21) to see whether the location of the pouring pipe outlet is a scouring area. If it is a scouring area, pour the anti-scouring material to cover the scouring area. The anti-scouring material is poured onto the honeycomb plate (5) and sinks to the seabed mud surface through the honeycomb gap until the anti-scouring material completely covers the scouring pit. If it is not a scouring area, the crane's boom moves, and the pouring hard pipe (18) moves accordingly, and is adjusted until the camera (21) observes the corresponding scouring area, and then pour the anti-scouring material to cover the scouring area. The anti-scouring material is poured onto the honeycomb plate (5) and sinks to the seabed mud surface through the honeycomb gap until the anti-scouring material completely covers the scouring pit. Combined with the camera, it is judged whether the construction area has been completed with pouring and covering. Step 5: Repeat step 4 until the scour pit is fully filled in the honeycomb panel (5) and the anti-scour material is poured to cover the entire scour pit area; Step 6: Wait for one to two hours and observe through the camera (21) that the anti-scour material can be bonded with the seabed mud and sand, and at the same time, the anti-scour material in contact with the honeycomb panel (5) is bonded with the honeycomb panel (5) to form a complete bonded covering surface, covering the scour pit; Step 7: Recover the grouting equipment, grouting pipeline, and grouting pump (19) to the construction vessel (1), and drive the vessel away from the construction site.

2. The anti-scour construction process for offshore structure foundation according to claim 1, characterized in that: In step 1, a scanning device is used for scanning, and the scanning device is a multi-beam scanning instrument. After scanning, the data is returned to the engine room of the construction vessel (1).

3. The anti-scour construction process for offshore structure foundation according to claim 1, characterized in that: The perfusion hard pipe (18) in step 3 is a long steel pipe, on which a universal joint (20) for connecting to the perfusion hose (17) is welded, and the sleeve hole (6) is used to insert the long steel pipe for connection, and the sleeve hole (6) is also provided with a fixing ring (22) for assisting in fixing the long steel pipe.

4. The anti-scour construction process for offshore structure foundation according to claim 1, characterized in that: The honeycomb panel (5) and the sleeve structure (4) are both made of degradable materials.

5. The anti-scour construction process for offshore structure foundation according to claim 1, characterized in that: The densities of the sleeve structure (4) and the honeycomb panel (5) are both greater than the density of seawater.

6. The anti-scour construction process for offshore structure foundation according to claim 1, characterized in that: The diameter of the sleeve hole (6) is 100 mm-120 mm.

7. The anti-scour construction process for offshore structure foundation according to claim 1, characterized in that: The pipe opening of the perfusion hard pipe (18) is designed to be trumpet-shaped.

8. The anti-scour construction process for offshore structure foundation according to claim 1, characterized in that: The anti-scour material is composed of cement, fly ash, cellulose, silica fume and curing agent materials.

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