Jet flow auxiliary system for underwater screw anchor installation

Abstract

The invention discloses a jet flow auxiliary system for underwater screw anchor installation, relates to the technical field of ocean engineering foundation installation, and solves the technical problems that traditional screw anchor installation depends on large equipment, installation is difficult due to super-large torque, and popularization of the traditional screw anchor in ocean engineering is restricted. The system comprises a fluid pump, a high-pressure fluid rotating structure and a hollow spiral anchor rod. A fluid inlet of the fluid pump is connected with the fluid storage container, a fluid outlet of the fluid pump is connected with a fluid inlet of the high-pressure fluid rotating structure, the top of the high-pressure fluid rotating structure is connected with the spiral anchor driving device, and a sealing output connector is installed at the bottom of the high-pressure fluid rotating structure. The hollow spiral anchor rod is inserted into the sealed output connector, and a plurality of jet flow spraying holes are formed in the bottom of the hollow spiral anchor rod. The end penetration resistance and the side wall friction resistance of the spiral anchor are reduced through the hydraulic action, and therefore the torque needed in the installation process of the spiral anchor is adaptively reduced.

Description

A jet-assisted system for underwater helical anchor installation Technical Field

[0001] This invention relates to the field of marine engineering foundation installation technology, and more specifically, to a jet-assisted system for underwater spiral anchor installation. Background Technology

[0002] With the increasing global demand for marine resource development, especially in the areas of deep-sea oil and gas extraction and offshore wind power generation, higher requirements are being placed on the reliability and economy of deep-sea anchoring foundations. As a highly efficient form of marine anchoring foundation, helical anchors offer significant advantages over traditional large-diameter steel pipe piles, suction barrels, or towed anchors, including lower cost, higher pull-out bearing capacity, lower installation noise, and less impact on the marine ecosystem. They are widely recognized as one of the most promising new foundation types in marine engineering. However, the large-scale application of helical anchors in deep-sea engineering faces key technical bottlenecks: their installation process relies entirely on screwing and penetration, requiring the application of enormous rotational torque and vertical thrust. This necessitates the availability of installation devices and construction methods for efficient and environmentally friendly installation of helical anchor foundations at sea. As marine engineering gradually expands into deeper waters, the size of anchoring foundations is increasing, often requiring installation torques of tens or even hundreds of mega-Newton-meters. In deep water conditions, especially when facing dense sand, hard clay or hard interlayer geology, the huge penetration resistance causes the installation torque required for the helical anchor to increase dramatically. The equipment that provides ultra-high torque in deep water environments is bulky, complex, and extremely expensive, and it also greatly affects construction safety and efficiency.

[0003] Traditional installation methods typically involve deck cranes in conjunction with underwater hydraulic hammers or hydraulic motors. These methods suffer from drawbacks such as short working windows, significant impact on marine life, high construction noise, high costs, and heavy reliance on large engineering vessels. Furthermore, for helical anchor foundations, the application of high torque by the construction vessel at sea level inevitably leads to torque reaction forces, hindering efficient installation and ensuring operational safety. To address these challenges, even with efficient torque application equipment, the drilling and penetration into high-strength seabed soil still requires extremely large and powerful installation drive devices. The resulting engineering costs and difficulties directly impact the widespread application of helical anchor foundations in marine engineering. Therefore, for the ultra-high torque installation requirements of large helical anchors in marine engineering, simply increasing the drive torque of the installation device is not the only solution. The key technological challenge that urgently needs to be overcome in this field is how to proactively reduce the soil's penetration resistance to the anchor body while ensuring that the helical anchor foundation's bearing capacity is not significantly affected, thereby effectively reducing the installation torque and achieving efficient installation of helical anchors in marine engineering. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a jet-assisted system for underwater spiral anchor installation, which addresses the shortcomings of the existing technology and solves the technical problems that traditional spiral anchor installation relies on large equipment and is difficult to install under ultra-high torque, thus restricting its promotion in marine engineering.

[0005] The present invention discloses a jet-assisted system for underwater helical anchor installation. The system includes a fluid pump, a high-pressure fluid rotating structure, and a hollow helical anchor rod. The fluid inlet of the fluid pump is connected to a fluid storage container, the fluid outlet of the fluid pump is connected to the fluid inlet of the high-pressure fluid rotating structure, the top of the high-pressure fluid rotating structure is connected to a helical anchor drive device, a sealed output connector is installed at the bottom of the high-pressure fluid rotating structure, the hollow helical anchor rod is inserted into the sealed output connector, and the bottom of the hollow helical anchor rod is provided with multiple jet nozzles.

[0006] The system also includes a controller that, when the jet-assisted system is running, performs the following:

[0007] Set a safe upper limit threshold for installation torque. Soft soil protection lower limit threshold and the benchmark penetration rate threshold Establish initial circulation flow and initial fluid pressure and control the fluid pump at the initial circulation flow rate. and initial fluid pressure Spraying is used to lubricate the tip of the hollow spiral anchor bolt;

[0008] Obtain the real-time installation torque T and the real-time penetration depth D of the helical anchor output by the power head;

[0009] The current instantaneous penetration rate is calculated based on the real-time penetration depth D. According to the aforementioned security upper limit threshold Soft soil protection lower limit threshold Reference penetration rate threshold Instantaneous penetration rate The system identifies geological conditions based on the real-time installation torque T and triggers fluid control measures accordingly.

[0010] As a further improvement, the high-pressure fluid rotating structure includes a stator housing, and the side wall of the stator housing is provided with an anti-rotation fixing rod and a radial water inlet interface communicating with the inside of the stator housing. The radial water inlet interface is connected to the fluid outlet of the fluid pump.

[0011] The stator housing has an upper connecting part at the top and a lower connecting part at the bottom. The upper connecting part is connected to the spiral anchor drive device, and the lower connecting part is connected to the sealing output joint to form a sealed cavity inside the stator housing.

[0012] The cavity contains a rotor spindle, and the drive part of the spiral anchor drive device passes through the connecting part and is connected to the rotor spindle. The bottom of the rotor spindle is connected to the sealed output connector. An axial fluid flow channel is provided inside the rotor spindle, and the axial fluid flow channel is connected to the radial water inlet interface. Multiple sets of rolling bearings are arranged on the inner wall of the cavity, and the rolling bearings are rotatably connected to the rotor spindle.

[0013] Furthermore, the upper and lower side walls of the cavity are provided with high-pressure resistant sealing rings, which are in close contact with the surface of the rotor spindle.

[0014] Furthermore, the sealed output connector is provided with a polygonal sealed output interface, and the bottom of the rotor spindle is inserted into the polygonal sealed output interface.

[0015] Furthermore, the hollow spiral anchor rod includes an internally hollow rod body, the top of the rod body is provided with a polygonal sealing connection joint, the top of the polygonal sealing connection joint is provided with a fluid inlet hole, the polygonal sealing connection joint is inserted into the polygonal sealing output interface and is connected to the bottom of the rotor core shaft, the bottom of the rod body is provided with an anchor tip and a spiral anchor disc blade, and the end of the rod body near the anchor tip is provided with multiple jet nozzles.

[0016] Furthermore, a sealing gasket is provided at the connection between the polygonal sealing connector and the rotor spindle.

[0017] Furthermore, the fluid inlet of the fluid pump is connected to the fluid storage container via a high-pressure resistant flexible pipe, and the fluid outlet of the fluid pump is connected to the fluid inlet of the high-pressure fluid rotating structure via a high-pressure resistant flexible pipe.

[0018] Furthermore, the method for identifying the geological conditions is to set the safety upper limit threshold. Soft soil protection lower limit threshold The reference penetration rate threshold is compared with the real-time installation torque T. With instantaneous penetration rate Compare;

[0019] When the real-time installation torque T is greater than or equal to the safety upper limit threshold and instantaneous penetration rate Less than the reference penetration rate threshold If so, the geological condition is identified as a hard soil layer tackling condition;

[0020] When the real-time installation torque T is greater than or equal to the safety upper limit threshold and instantaneous penetration rate When the value is zero, the geological condition is identified as a clay mud condition.

[0021] When the real-time installation torque T is less than the lower threshold value for soft soil protection If so, the geological condition is identified as a soft soil bearing condition;

[0022] When the real-time installation torque T is less than the safety upper limit threshold And greater than or equal to the lower limit threshold for soft soil protection and instantaneous penetration rate Less than the reference penetration rate threshold If so, the geological conditions are identified as normal penetration conditions.

[0023] Furthermore, the fluid control measures are as follows:

[0024] When the geological condition is identified as a hard soil layer tackling condition, the initial fluid pressure at the fluid pump outlet is... Increase the fluid pressure to the preset maximum value, and increase the initial circulating flow rate of the fluid pump outlet. Increase to the preset maximum jet flow rate;

[0025] When the geological condition is identified as clay mud condition, the fluid pump is controlled to output high-frequency flow pulsation.

[0026] When the geological condition is identified as soft soil bearing condition, the initial circulation flow rate of the fluid pump outlet is adjusted. Reduce to the preset minimum jet flow rate ;

[0027] When the geological conditions are identified as normal penetration conditions, the initial fluid pressure at the fluid pump outlet is maintained. and initial circulation flow .

[0028] Furthermore, when the real-time penetration depth D is greater than or equal to the preset target penetration depth... When the fluid pump is turned off, the spiral anchor is screwed in at a constant speed to complete the installation of the spiral anchor.

[0029] Beneficial effects

[0030] The advantages of this invention are:

[0031] This invention utilizes a fluid pump, a high-pressure fluid rotating structure, and a hollow spiral anchor rod. The fluid inlet of the fluid pump is connected to a fluid storage container, and the fluid outlet of the fluid pump is connected to the fluid inlet of the high-pressure fluid rotating structure. The top of the high-pressure fluid rotating structure is connected to the spiral anchor drive device, and the bottom of the high-pressure fluid rotating structure is connected to the hollow spiral anchor rod through a sealed output joint. The hollow spiral anchor rod and jet nozzles serve as fluid channels. Combined with the specially designed high-pressure fluid rotating structure, an auxiliary high-pressure jet is applied during the spiral anchor's twisting and penetration process. This structurally achieves a rotating dynamic seal transmission of the high-pressure fluid. The hydraulic action reduces the penetration resistance at the spiral anchor end and the sidewall friction resistance, thereby adaptively reducing the torque required during installation and achieving simultaneous operation of the spiral anchor's "twisting and penetration" and "jet resistance reduction." Attached Figure Description

[0032] Figure 1 is a front view of the overall structure of the jet-assisted system for underwater helical anchor installation according to the present invention;

[0033] Figure 2 is a top view of the overall structure of the jet-assisted system for underwater helical anchor installation according to the present invention;

[0034] Figure 3 is a perspective view of the high-pressure fluid rotation structure of the jet-assisted system of the present invention;

[0035] Figure 4 is a cross-sectional view of the high-pressure fluid rotation structure of the jet-assisted system of the present invention;

[0036] Figure 5 is a cross-sectional view of the high-pressure fluid rotating structure of the jet-assisted system of the present invention;

[0037] Figure 6 is a perspective view of the sealed output connector of the jet-assisted system of the present invention;

[0038] Figure 7 is a schematic diagram of the hollow spiral anchor bolt structure of the jet-assisted system of the present invention;

[0039] Figure 8 is a schematic diagram of the polygonal sealed connection joint structure of the hollow spiral anchor bolt structure of the jet-assisted system of the present invention.

[0040] Figure 9 is a schematic diagram of the first embodiment of the anchor tip structure of the hollow spiral anchor bolt structure of the jet-assisted system of the present invention;

[0041] Figure 10 is a schematic diagram of the anchor tip structure of the hollow spiral anchor bolt structure of the jet-assisted system of the present invention in a second embodiment.

[0042] Figure 11 is a schematic diagram of the third embodiment of the anchor tip structure of the hollow spiral anchor bolt structure of the jet-assisted system of the present invention;

[0043] Figure 12 is a flowchart of the control method of the jet-assisted system for underwater helical anchor installation according to the present invention.

[0044] Among them: 1-High-pressure fluid rotating structure, 2-Sealed output joint, 3-Hollow spiral anchor rod, 4-Experimental tank, 5-High-pressure resistant flexible pipe, 6-Fluid pump, 7-Fluid storage container, 11-Upper connecting part, 12-Anti-rotation fixing rod, 13-Radial water inlet interface, 14-Stator housing, 15-Lower connecting part, 16-First bolt hole, 17-Rotor spindle, 18-Axial fluid flow channel, 19-Rolling bearing, 21-Polygonal sealed output interface, 20-Sealing ring, 22-Second bolt hole, 30-Rod body, 31-Polygonal sealed connection joint, 32-Jet nozzle, 33-Anchor tip, 34-Spiral anchor disc blade. Detailed Implementation

[0045] The present invention will be further described below with reference to embodiments, but this does not constitute any limitation on the present invention. Any limited modifications made by any person within the scope of the claims of the present invention are still within the scope of the claims of the present invention.

[0046] Referring to Figures 1-12, a jet-assisted system for underwater spiral anchor installation according to the present invention is shown in the schematic diagram of the overall structure of the jet-assisted installation system in Figures 1 and 2. The fluid transmission path of the jet-assisted installation system provided by the present invention passes through: a fluid supply and control unit (including a high-pressure resistant flexible pipe 5, a fluid pump 6, and a fluid storage container 7), a high-pressure fluid rotation structure 1, and a hollow spiral anchor rod 3 with nozzles.

[0047] Fluid Supply and Control Unit: In experimental or engineering applications, the liquid storage container 7 is used to hold water or drag-reducing fluids; the fluid pump 6 (as shown in the figure, a controllable experimental pump set or an engineering high-pressure plunger pump) is connected to the liquid storage container via a high-pressure resistant flexible tube 5. This fluid pump 6 integrates a flow regulation module and a pressure monitoring module, and can output fluid at a precise flow rate according to the set flow requirements. One end of the high-pressure resistant flexible tube 5 is connected to the fluid outlet of the fluid pump 6, and the other end is connected to the radial water inlet 13 of the high-pressure fluid rotating structure 1. A flexible connection is used to accommodate positional movement during installation. In experiments, a pagoda joint or other fixing method can be used; in engineering applications, the fixing method can be set as needed.

[0048] High-pressure fluid rotating structure (refer to Figures 3, 4, and 5):

[0049] This structure is the core component for achieving "simultaneous screwing and jetting" during the installation of the spiral anchor, solving the problem of transferring fluid from the fixed pipeline to the rotating anchor rod. A three-dimensional view of the external structure of the high-pressure fluid rotating structure is shown in Figure 3. This unit includes an external stator housing 14 with a protruding radial water inlet 13 on its side wall, which is used to connect to the high-pressure resistant flexible pipe 5. The top of the stator housing 14 has an upper connecting part 11, and the bottom of the stator housing 14 has a lower connecting part 15. Multiple first bolt holes 16 are provided on the side walls of both the upper connecting part 11 and the lower connecting part 15. The side wall of the sealed output connector 2 has second bolt holes 22 corresponding to the first bolt holes 16. The upper connecting part 11 is connected and secured to the upper drive part of the spiral anchor installation device by bolts screwed into the first bolt holes 16, and the lower connecting part 15 and the sealed output connector 2 are connected and secured by bolts screwed into the first bolt holes 16 and the second bolt holes 22, thereby forming a closed internal cavity within the stator housing 7.

[0050] The longitudinal sectional view of the dynamic seal inside the high-pressure fluid rotary joint is shown in Figures 4 and 5. The rotor spindle 17 is located at the center of the stator housing 14 and can rotate at high speed relative to the stator housing 14. An axial fluid flow channel 18 (a combination of a central blind hole and a side hole as shown in the figure) is opened at the center of the spindle. The fluid enters the cavity from the radial water inlet 13, then enters the axial fluid flow channel 18, and finally flows out from the lower end outlet of the spindle. The fluid is sent to the sealed output joint 2, which is directly connected to the hollow spiral anchor rod 3. The bearing support system is arranged axially between the stator housing 14 and the rotor spindle 17, with multiple sets of rolling bearings 19 (two sets of bearing positions are visible in Figure 4). This bearing set is used to withstand the radial swing load and part of the axial reaction force generated during the installation of the spiral anchor, thereby ensuring smooth rotational transmission. The high-pressure sealing components are respectively set on the upper and lower sides of the cavity. The high-pressure sealing components are all high-pressure resistant sealing rings 20. The sealing rings 20 are tightly attached to the rotor spindle 17 and can prevent high-pressure fluid from leaking towards the bearings during rotation, and ensure the tight connection between the upper and lower components. A lower connecting part 15 is provided at the bottom end of the stator housing 14, with a dustproof ring inside. This not only connects the high-pressure fluid rotating structure 1 to the hollow spiral anchor rod 3, but also prevents mud and water from the external environment from entering the joint and damaging the bearing.

[0051] Hollow spiral anchor bolt and connection interface (refer to Figures 6, 7, and 8):

[0052] The top of the hollow spiral anchor bolt 3 is designed as a polygonal sealing connection joint 31 (such as a hexagonal joint). This polygonal sealing connection joint 31 is used to cooperate with the upper power drive component of the spiral anchor drive device, receive rotational torque, and transmit fluid under sealed conditions. A fluid inlet hole is provided at the center of the top of the drive head 31. A high-pressure resistant rotating end face sealing ring is provided around this hole (as shown in the contact surface design in Figure 6). When the lower end of the rotor spindle 17 mates with the polygonal sealing connection joint 31, a static seal is achieved at the end face through an O-ring or sealing gasket, ensuring that the fluid is transported into the interior of the anchor bolt without damage.

[0053] The schematic diagram of the hollow spiral anchor rod structure (overall view) is shown in Figure 7. The rod body of the hollow spiral anchor rod 3 is made of high-strength steel pipe and is hollow inside, serving as a fluid delivery channel. After the fluid enters the spiral anchor, it goes directly to the anchor tip 33 at the bottom and the jet nozzle 32.

[0054] Diverse jet anchor tip configurations (refer to Figures 9, 10, and 11):

[0055] This invention designs three optional jet nozzle arrangements to achieve different jet directions and hydraulic effects, taking into account different characteristics and working conditions of seabed engineering (simulation experiments).

[0056] Example 1 is a schematic diagram of a lateral jet anchor tip structure for scouring soil along the anchor plate, as shown in Figure 9. Lateral jet nozzles 32 (shown as jet nozzles on the blade edges) are provided on the conical surface of the anchor tip 33 or on the cutting surfaces of the first and multiple spiral anchor plate blades 34. Working principle: The high-pressure jet directly impacts the soil along the anchor tip's penetration path, utilizing hydraulic scouring to affect the soil structure and strength, thereby reducing the penetration resistance at the end and sides of the spiral anchor.

[0057] Example 2 is a schematic diagram of a lateral four-hole soil-flushing type jet anchor tip structure, as shown in Figure 10. On the side wall of the anchor tip rod, there are four lateral jet nozzles 32 evenly distributed along the circumference, and the fluid is ejected radially along the jet nozzles 32.

[0058] Example 3 is a schematic diagram of a lateral eight-hole scouring jet anchor tip structure, as shown in Figure 11 (refer to a variant of Figure 10). Eight nozzles in double rows or with denser arrangement are arranged on the side wall of the anchor tip rod. The jet fluid forms a continuous water film or action path between the rod 30 and the surrounding soil.

[0059] In actual operation, the jet auxiliary system pipeline is first connected and pressure and flow tests are conducted. The fluid supply unit is started, and an initial low flow rate is set to prevent nozzle blockage and drive the auger anchor to begin rotating and penetrating. The system continuously monitors the auger anchor installation parameters such as installation torque and pressure: when the torque is within the normal range, a low flow rate jet is maintained, mainly for fluid lubrication; when a sharp increase in torque is detected (encountering hard soil layers or complex working conditions), the fluid pump automatically increases the pumping pressure and flow rate, and high-pressure fluid is ejected at high speed from the anchor tip nozzle to enhance the soil flushing ability; when the torque drops or the installation is in place, the low flow rate is restored or the jet is shut off to avoid excessive disturbance to the soil, ensuring that the soil can be quickly consolidated after installation and guaranteeing the pull-out bearing capacity of the auger anchor.

[0060] Figure 12 shows the control method flowchart of the jet-assisted system. To address the operational challenges of single torque feedback control under complex geological conditions in deep water, the system also includes a controller. During operation of the jet-assisted system, the controller executes a control method based on "torque-penetration rate (TPR)". A dual-parameter coupled geological condition real-time identification and adaptive jet flow rate classification control mechanism. This mechanism relies on the central control module built into the fluid supply and control unit. Its core technical points and control process are detailed below: After the system starts, the initialization program is executed first; the preset target penetration depth is read. Based on the structural strength of the helical anchor bolt and geological survey data, a safe upper limit threshold for the installation torque is set. Soft soil protection lower limit threshold and the benchmark penetration rate threshold Establish initial circulation flow and initial fluid pressure Based on the initial circulation flow and initial fluid pressure The fluid pump 6 is controlled to pre-spray fluid to ensure unobstructed pipeline flow and lubricate the anchor tip. After the fluid circulation stabilizes, the power unit is driven to begin turning and inserting the auger anchor. During operation, the system uses a multi-source data acquisition module to synchronously acquire dynamic and fluid parameters at high frequency, including the real-time installation torque T output by the power head and the real-time penetration depth D of the auger anchor. The current instantaneous penetration rate is calculated based on the real-time penetration depth D. Meanwhile, the central control module performs differential calculations on the depth data. Instantaneous penetration rate. The expression is: According to the aforementioned security upper limit threshold Soft soil protection lower limit threshold Reference penetration rate threshold Instantaneous penetration rate The system identifies geological conditions based on the real-time installation torque T and triggers fluid control measures accordingly.

[0061] The control logic analyzes the torque T and penetration rate together. The relationship between "and" is used to classify geological conditions into four categories and automatically match the corresponding execution strategies: the safety upper limit threshold is set. Soft soil protection lower limit threshold The reference penetration rate threshold is compared with the real-time installation torque T. Comparison with instantaneous penetration rate (ROP).

[0062] (1) When the real-time installation torque T is detected to be greater than or equal to the safety upper limit threshold and instantaneous penetration rate Less than the reference penetration rate threshold When penetration is slow, the system determines that the anchor tip has encountered dense sand or a hard interlayer, identifying the geological condition as a hard soil layer attack condition. The controller instructs the pump station to enter the "high-pressure soil flushing mode," which increases the initial fluid pressure at the fluid pump outlet. Increase the fluid pressure to the preset maximum value, and increase the initial circulating flow rate of the fluid pump outlet. The jet flow rate is increased to the preset maximum value, thereby using high-energy jets to hydraulically jettison and cut the soil in front of the anchor tip, in order to assist the power equipment in twisting and breaking through the hard layer barrier.

[0063] (2) When the real-time installation torque T is greater than or equal to the safety upper limit threshold and instantaneous penetration rate When the thrust is zero, the system determines that viscous mud or drill clogging has occurred, identifying the geological condition as a clay mud condition. In this case, simply increasing thrust is ineffective. The controller instructs the pump station to enter "pulse flushing mode," controlling the fluid pump to output high-frequency flow pulses. The impact fatigue effect of the unsteady jet is used to peel off the mud clumps adhering to the blades and shaft, and lateral lubrication is enhanced, restoring hydraulic cutting capability.

[0064] (3) When the real-time installation torque T is monitored to be less than the lower limit threshold for soft soil protection When the torque is too low, the geological condition is identified as soft soil bearing condition, and the system determines that it has entered a weak clay or silt layer. The controller instructs the pump station to enter "low-flow micro-disturbance mode" to quickly reduce the initial circulation flow. Reduce to the minimum jet flow rate required to prevent nozzle clogging This minimizes the disturbance and liquefaction of the jet on the soft soil, prevents the loss of strength of the soil around the anchor due to excessive scouring, and thus ensures the ultimate pull-out bearing capacity of the spiral anchor.

[0065] (4) When the real-time installation torque T is less than the safety upper limit threshold And greater than or equal to the lower limit threshold for soft soil protection and instantaneous penetration rate Less than the reference penetration rate threshold If the geological conditions are identified as normal penetration conditions, the controller maintains the dynamic balance of the current fluid parameters and operates in "steady flow reference mode" to ensure the continuity and stability of the helical anchor penetration installation.

[0066] While the main control process described above is running, the system executes the safety monitoring loop in parallel. By monitoring the flow resistance characteristics of the pipeline in real time, when an abnormally sharp increase in pipeline pressure P and a simultaneous sudden drop in flow rate Q are detected, the system determines that the nozzle has become physically blocked. At this time, the main control program is immediately interrupted, triggering the anti-blockage processing subroutine, automatically pausing the screw anchor's tightening and penetration, and executing reverse pressure relief or high-pressure impact cleaning commands. After the pressure sensor feedback value returns to normal, it automatically resets and continues the original screwing and penetration operation; if multiple cleaning attempts are ineffective, a fault alarm is triggered and the system shuts down.

[0067] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention, and these will not affect the effectiveness of the implementation of the present invention or the practicality of the patent.

Claims

1. A jet-assisted system for underwater spiral anchor installation, characterized in that, The system includes a fluid pump (6), a high-pressure fluid rotating structure (1), and a hollow spiral anchor rod (3); the fluid inlet of the fluid pump (6) is connected to a fluid storage container (7), the fluid outlet of the fluid pump (6) is connected to the fluid inlet of the high-pressure fluid rotating structure (1), the top of the high-pressure fluid rotating structure (1) is connected to a spiral anchor drive device, a sealed output connector (2) is installed at the bottom of the high-pressure fluid rotating structure (1), the hollow spiral anchor rod (3) is inserted into the sealed output connector (2), and the bottom of the hollow spiral anchor rod (3) is provided with multiple jet nozzles (32); the system also includes a controller, which performs the following when the jet-assisted system is running: setting the safety upper limit threshold of the installation torque. Soft soil protection lower limit threshold and the benchmark penetration rate threshold Establish initial circulation flow and initial fluid pressure and control the fluid pump (6) to the initial circulation flow rate. and initial fluid pressure Spraying is used to lubricate the tip (33) of the hollow helical anchor bolt (3); the real-time installation torque T output by the power head and the real-time penetration depth D of the helical anchor are obtained; the current instantaneous penetration rate is calculated based on the real-time penetration depth D. According to the aforementioned security upper limit threshold Soft soil protection lower limit threshold Reference penetration rate threshold Instantaneous penetration rate The system identifies geological conditions based on the real-time installation torque T and triggers fluid control measures accordingly.

2. The jet-assisted system for underwater spiral anchor installation according to claim 1, characterized in that, The high-pressure fluid rotating structure (1) includes a stator housing (14), on which a rotation-stopping rod (12) and a radial water inlet (13) communicating with the interior of the stator housing (14) are provided. The radial water inlet (13) is connected to the fluid outlet of the fluid pump (6). The top of the stator housing (14) is provided with an upper connecting part (11), and the bottom of the stator housing (14) is provided with a lower connecting part (15). The upper connecting part (11) is connected to the spiral anchor drive device, and the lower connecting part (15) is connected to the sealed output connector (2). A sealed cavity is formed inside the stator housing (14); a rotor spindle (17) is provided in the cavity, the drive part of the spiral anchor drive device passes through the upper connecting part (11) and is connected to the rotor spindle (17), the bottom of the rotor spindle (17) is connected to the sealed output connector (2); an axial fluid flow channel (18) is provided inside the rotor spindle (17), the axial fluid flow channel (18) is connected to the radial water inlet interface (13); multiple sets of rolling bearings (19) are arranged on the inner wall of the cavity, and the rolling bearings (19) are rotatably connected to the rotor spindle (17).

3. A jet-assisted system for underwater spiral anchor installation according to claim 2, characterized in that, The upper and lower side walls of the cavity are provided with high-pressure resistant sealing rings (20), and the sealing rings (20) are in close contact with the surface of the rotor spindle (17).

4. A jet-assisted system for underwater spiral anchor installation according to claim 2, characterized in that, The sealed output connector (2) is provided with a polygonal sealed output interface (21), and the bottom of the rotor spindle (17) is inserted into the polygonal sealed output interface (21).

5. A jet-assisted system for underwater spiral anchor installation according to claim 4, characterized in that, The hollow spiral anchor rod (3) includes a hollow rod body (30). The top of the rod body (30) is provided with a polygonal sealing connection joint (31). The top of the polygonal sealing connection joint (31) is provided with a fluid inlet hole. The polygonal sealing connection joint (31) is inserted into the polygonal sealing output interface (21) and docks with the bottom of the rotor spindle (17). The bottom of the rod body (30) is provided with an anchor tip (33) and a spiral anchor disc blade (34). The end of the rod body (30) near the anchor tip (33) is provided with multiple jet nozzles (32).

6. A jet-assisted system for underwater spiral anchor installation according to claim 5, characterized in that, A sealing gasket is provided at the connection between the polygonal sealing connector (31) and the rotor spindle (17).

7. A jet-assisted system for underwater spiral anchor installation according to claim 1, characterized in that, The fluid inlet of the fluid pump (6) is connected to the fluid storage container (7) through a high-pressure resistant flexible pipe (5), and the fluid outlet of the fluid pump (6) is connected to the fluid inlet of the high-pressure fluid rotating structure (1) through a high-pressure resistant flexible pipe (5).

8. A jet-assisted system for underwater spiral anchor installation according to claim 1, characterized in that, The method for identifying the geological conditions is to set the safety upper limit threshold. Soft soil protection lower limit threshold The reference penetration rate threshold is compared with the real-time installation torque T. With instantaneous penetration rate Comparison; when the real-time installation torque T is greater than or equal to the safety upper limit threshold. and instantaneous penetration rate Less than the reference penetration rate threshold When the geological condition is identified as a hard soil layer tackling condition, and the real-time installation torque T is greater than or equal to the safety upper limit threshold, then the geological condition is identified as a hard soil layer tackling condition. and instantaneous penetration rate When the value is zero, the geological condition is identified as clay slurry condition; when the real-time installation torque T is less than the lower limit threshold for soft soil protection... If so, the geological condition is identified as a soft soil bearing condition; When the real-time installation torque T is less than the safety upper limit threshold And greater than or equal to the lower limit threshold for soft soil protection and instantaneous penetration rate Less than the reference penetration rate threshold If so, the geological conditions are identified as normal penetration conditions.

9. A jet-assisted system for underwater spiral anchor installation according to claim 8, characterized in that, The fluid control measure is as follows: when the geological condition is identified as a hard soil layer attack condition, the initial fluid pressure at the fluid outlet of the fluid pump (6) is adjusted. Increase the fluid pressure to the preset maximum value, and increase the initial circulating flow rate of the fluid pump (6) at the fluid outlet. Increase the jet flow rate to the preset maximum value; when the geological condition is identified as clay slurry condition, control the fluid pump (6) to output high-frequency flow pulsation; when the geological condition is identified as soft soil bearing condition, increase the initial circulating flow rate of the fluid pump (6) outlet. Reduce to the preset minimum jet flow rate When the geological conditions are identified as normal penetration conditions, the initial fluid pressure at the fluid outlet of the fluid pump (6) is maintained. and initial circulation flow 。 10. A jet-assisted system for underwater spiral anchor installation according to claim 9, characterized in that, When the real-time penetration depth D is greater than or equal to the preset target penetration depth When the fluid pump (6) is turned off, the spiral anchor is screwed in at a constant speed and the installation of the spiral anchor is completed.

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