Buoyancy type ocean pile foundation anti-pulling detection device and mounting method thereof

Abstract

The invention relates to the technical field of offshore anti-pulling detection, and discloses a buoyancy type ocean pile foundation anti-pulling detection device and an installation method thereof.The buoyancy type ocean pile foundation anti-pulling detection device comprises a hoop device and two dynamic positioning ship rafts, a girder is arranged between the two dynamic positioning ship rafts, and a disc is fixedly arranged at the position, coaxial with a pile foundation, of the center point of the girder; the top end of the hoop device is fixed below the disc through a plurality of steel bars. The hoop device comprises an inner hoop and an outer hoop which are fixedly connected, the inner hoop tightly holds the pile foundation, a plurality of grooves are correspondingly formed in the outer side of the inner hoop and the inner side of the outer hoop, and compressed springs are arranged in the grooves; a water suction pump on the dynamic positioning ship raft equivalently pumps seawater out of the dynamic positioning ship raft, and pile foundation uplift detection is carried out. The pile foundation spring type hoop device tightly holds the pile foundation, the compressed spring generates acting force between the outer side of the inner hoop and the inner side of the outer hoop, the acting force generated on the outer side of the inner hoop increases the friction force between the inner hoop and the pile, and the problem that the pile and the hoop device in a traditional single hoop detection device slide relatively is effectively solved.

Description

Technical Field

[0001] The invention relates to the field of offshore pull-out pile detection, and in particular to a buoyancy type marine pile foundation pull-out detection device and an installation method thereof. Background Art

[0002] At present, with the construction of a series of offshore infrastructure such as offshore wind turbines, offshore platforms, and cross-sea bridges, offshore buildings are significantly affected by seawater. The lower pile foundation needs to withstand greater uplift buoyancy, and it is very difficult to test pull-out piles in the ocean. At present, there are pile-anchor method, self-balancing method, etc. for testing pull-out piles at sea. The pile-anchor method is the main instrument and equipment for testing the pull-out bearing capacity of foundation piles and is common to all equipment for axial compressive static load tests of single piles. The anchor pile reaction beam device is used to provide reaction force by separately setting a number of anchor piles around the test pile, and the load is applied by a jack. The self-balancing pile test method is a method of burying a load box in the pile body and using the friction resistance above the load box to provide reaction force to the pile body below the load box. The pile-anchor method requires driving multiple anchor piles. The testing cost of large-diameter pile foundations in the ocean is extremely high, and the construction period is long. The main problem with the self-balancing method for testing pile foundations is that the detection device is relatively complicated and the detection device cannot be reused. These methods also lead to a significant increase in the construction cost of single pile foundations.

[0003] Traditional anchoring positioning methods for ships are widely used. Although this type of positioning method has a good effect on the fixation of ships, this type of traditional positioning method will limit the displacement of ships. Clamp devices are widely used in bridge engineering, foundation engineering, and transportation engineering. In recent years, single clamp type detection devices have also been widely used in pull-out pile foundation detection. The detection device of offshore pull-out piles needs to be in contact with seawater, and seawater infiltration may reduce the frictional resistance between the pile foundation and the clamp device. The offshore detection of pull-out piles will be affected by various external environments. During the detection process, wind and waves have a greater impact on the positioning of ordinary ships. If the influence of external factors such as wind and waves is not eliminated, the detection results may be inaccurate and the construction progress may be affected. Summary of the invention

[0004] In order to overcome or alleviate one or more of the above technical problems, the purpose of the present invention is to provide a buoyant marine pile foundation pull-out detection device and its installation method, which adopts the ship buoyancy method instead of the traditional anchor pile method for detection, reduces the detection cost and improves the detection efficiency. It is more economical and convenient than the traditional method, and can effectively overcome the influence of the external environment on the pile foundation pull-out detection. At the same time, the detection ship raft is equipped with a dynamic positioning system to replace the traditional anchoring method to meet the detection needs of pile foundation construction under complex marine environment conditions.

[0005] The present invention provides the following technical solutions:

[0006] In a first aspect, the present invention provides a buoyancy-type marine pile foundation anti-pulling detection device, comprising a clamping device and two dynamic positioning rafts (8), wherein a beam (3) is horizontally arranged between the two dynamic positioning rafts (8), and a disk (4) is fixedly arranged at the center point of the beam (3) coaxially with the pile foundation; the top of the clamping device is fixed to the bottom of the disk (4) by a plurality of steel bars (5); the clamping device comprises an inner hoop (12) and an outer hoop (13) which are fixedly connected, the inner hoop (12) clamps the pile foundation, and the outer side of the inner hoop (12) and the outer hoop (13) are fixedly connected to each other. A plurality of grooves are arranged correspondingly on the inner side, and a compressed spring (14) is arranged in the groove; a dynamic positioning system is arranged on the dynamic positioning raft (8), and the dynamic positioning system calculates and generates thrust to position the dynamic positioning raft (8) in the sea based on external environmental data collected by a sensor group; a seawater storage tank (9) and a water pump (10) are respectively arranged on the dynamic positioning raft (8), and the water pump (10) equally pumps the seawater stored in the seawater storage tank (9) out of the dynamic positioning raft (8) to perform anti-pullout detection of marine pile foundations.

[0007] According to some embodiments, the inner hoop (12) and the outer hoop (13) are both two semicircles, which are connected by symmetrical steel plates extending outward on both sides and fixed by multiple groups of bolts, and reinforcing ribs (15) are provided between the steel plate of the outer hoop (13) and the outer surface of the outer hoop (13).

[0008] According to some embodiments, fixing sleeves (11) are evenly distributed on the outer wall of the inner hoop (12), the lower end of the steel bar (5) is fixed by the fixing sleeve (11), and the upper end passes through the evenly distributed through holes of the disc (4) and is fixed by the sleeve (22).

[0009] According to some embodiments, the dynamic positioning raft (8) is provided with a beam pad (7) for adjusting the horizontal position of the beam (3), and the upper surface of the beam (3) is provided with multiple sets of level rulers; the beam is placed at the middle 1 / 2 length of the seawater storage tank (9).

[0010] According to some embodiments, the beam pads (7) are multiple and vertically stacked, and are made of stone; and the disc (3) is made of steel.

[0011] According to some embodiments, the dynamic positioning system includes a bow thruster (28), an azimuth thruster (29), a sonar positioning system (30), an anemometer (32), a differential GPS (31), a heading sensor (33), a motion sensor (34) and a raft level ruler (35), wherein the bow thruster (28) is located on both sides of the hull of the dynamic positioning raft (8) near the bow and stern, and the azimuth thruster (28) is located in the middle of the bottom of the ship. (8) is equipped with two azimuth thrusters (28), the sonar positioning system (30) is located in the middle of the bottom of the ship away from the azimuth thrusters (28), and the sonar signal receiver (20) is arranged on the seabed mud surface; the anemometer (32) and the differential GPS (31) are both located on the mast; the heading sensor (33) is arranged on the bow and stern line of the dynamic positioning raft (8); the motion sensor (34) is arranged in the cabin near the center of gravity of the ship; the raft level ruler (35) is arranged on the side of the ship.

[0012] In a second aspect, the present invention further provides a method for installing the above-mentioned buoyancy type marine pile foundation anti-pullout detection device, comprising the following steps:

[0013] S1: installing the inner hoop, hoisting the inner hoop (12) to a predetermined position outside the pile foundation, and connecting the two semicircular inner hoops 12 with nuts and screws;

[0014] S2: installing the outer hoop, placing one end of the spring (14) into the outer groove of the inner hoop, then hoisting the outer hoop (13) to a position parallel to the inner hoop (12), and installing the other end of the spring (14) into the inner groove of the outer hoop, again using the ship as a fixed point and using 6 to 9 groups of jacks to clamp the two symmetrical outer hoops (13) to the inner hoop (12) with equal force, then using nuts and screws to connect the two semicircular outer hoops (13), and finally installing the steel bar (5) on the fixed sleeve (11);

[0015] S3: disc installation, erecting the beam (3) before the two dynamic positioning rafts (8), placing the disc (4) at the center of the upper surface of the beam (3) coaxial with the pile foundation, then passing the steel bar (5) through the through hole, and then using the beam pad (7) to adjust the beam (3) to a suitable height, and finally fixing the top end of the steel bar (5) through the sleeve (22);

[0016] S4: Dynamic positioning raft positioning, first place a sonar signal receiver (20) on the seabed mud surface, then use differential GPS (31) and sonar positioning system (30) to accurately position near the pile to be measured, then turn on the bow sensor (33), anemometer (32) and motion sensor (34), control the bow thruster (28) and azimuth thruster (29) according to the data measured by various sensors, and finally start observing the raft level rod (35).

[0017] S5: Pumping out seawater from the seawater storage tank, the two dynamically positioned rafts 8 pump out seawater from the seawater storage tank (9) in equal amounts through the pumping pumps (10);

[0018] S6: If the clamping device (2) needs to be disassembled, firstly, the dynamic positioning raft (8) is used as a fixed point to use multiple sets of jacks to apply external forces to the two outer hoops (13) horizontally and evenly at the same time, then the screw and nut are removed, and then the dynamic positioning raft (8) is used as a fixed point to use multiple sets of jacks to slowly and evenly unload the force horizontally at the same time. When the elastic force of the spring (14) is completely unloaded, the outer hoop (13) is removed, and finally the spring (14) and the inner hoop (12) are removed in sequence.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The present invention uses the principle of ship buoyancy to pump out the seawater on the dynamic positioning raft through a water pump, thereby increasing the buoyancy of the raft to detect the pull-out piles. This method of offshore pile foundation pull-out detection solves the problems of high cost, long construction period, and large pollution caused by the traditional anchor pile method, which requires four anchor piles to be driven near the pile foundation to be detected. It can also solve the problem that the detection device cannot be reused in the self-balancing method, thereby reducing construction costs and accelerating project progress.

[0021] 2. The present invention uses a pile foundation spring-type clamp device to clamp the pile foundation, and the compressed spring generates a force between the outer side of the inner clamp and the inner side of the outer clamp. The force generated on the outer side of the inner clamp increases the friction between the inner clamp and the pile, effectively solving the problem of relative sliding between the pile and the clamp device in the traditional single clamp detection device. The device has a wide range of applications and is suitable for concrete pile foundations, pipe piles, etc., especially for offshore pile foundation pull-out detection, which can effectively reduce the influence of seawater infiltration on the pull-out detection process;

[0022] 3. The present invention adopts a ship raft dynamic positioning system. The dynamic positioning system calculates the external disturbance force on the ship based on the external environment data measured by various sensors of the ship, and then generates thrust through various thruster units. The thrust generated enables the ship to maintain or approach the target position. The pull-out bearing capacity of the pile foundation can still be tested under relatively severe sea conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic structural diagram of a buoyancy type marine pile foundation anti-pullout detection device provided in an embodiment of the present invention.

[0024] Figure 2 A top view of a dynamic positioning raft provided in an embodiment of the present invention.

[0025] Figure 3 A top view of a pile foundation spring type clamp device provided in an embodiment of the present invention.

[0026] Figure 4 A front view of a pile foundation spring type clamp device provided in an embodiment of the present invention.

[0027] Figure 5 This is an overall structural diagram of the pile foundation spring type clamp device provided in an embodiment of the present invention.

[0028] Figure 6 A diagram of the dispersed structure of a pile foundation spring-type clamp device provided in an embodiment of the present invention.

[0029] Figure 7 A front view of the outer side of the inner hoop provided in an embodiment of the present invention.

[0030] Figure 8 A front view of the inner side of an outer hoop provided in an embodiment of the present invention.

[0031] Fig. 9 A schematic structural diagram of a sleeve and a steel disc provided in an embodiment of the present invention.

[0032] Fig.10 A cross-sectional view of a sleeve and a steel disc provided for an embodiment of the present invention.

[0033] In the figure:

[0034] 1-pile foundation; 2-pile foundation spring clamp device; 3-beam; 4-disc; 5-rebar; 6-level ruler; 7-beam pad; 8-dynamic positioning raft; 9-seawater storage tank; 10-water pump; 11-fixed sleeve; 12-inner hoop; 13-outer hoop; 14-spring; 15-reinforcement rib; 16-screw; 17-lifting ring; 18-outer groove of inner hoop; 19-inner groove of outer hoop; 20-sonar signal receiver; 21-through hole; 22-sleeve; 23-inner steel plate of inner hoop; 24-outer steel plate of inner hoop; 25-screw hole; 26-nut; 27-outer steel plate of outer hoop; 28-bow thruster; 29-full-turn thruster; 30-sonar positioning system; 31-differential GPS; 32-anemometer; 33-heading sensor; 34-motion sensor; 35-raft level ruler. DETAILED DESCRIPTION

[0035] The present invention is described in detail below in conjunction with the embodiments and drawings, but it should be understood that the embodiments and drawings are only used to exemplify the present invention and do not constitute any limitation on the protection scope of the present invention. All reasonable changes and combinations within the scope of the inventive concept of the present invention fall within the protection scope of the present invention.

[0036] The present invention adopts the dynamic positioning system technology and the spring clamp device technology. The dynamic positioning system technology calculates the external disturbance force on the ship based on the external environment data measured by various sensors of the ship, and then generates thrust through each thruster unit. The thrust generated enables the ship to maintain or approach the target position, which can effectively eliminate the impact of sea waves on the ship and raft, and does not limit the upward and downward displacement of the ship and raft. The spring clamp device technology uses the force provided by the compressed spring to clamp the pile foundation to prevent the friction between the pile foundation and the clamp from being reduced by seawater, and the spring clamp device is reusable, which reduces the cost of offshore pile foundation detection.

[0037] The present invention will be further described below in conjunction with the accompanying drawings.

[0038] Example 1

[0039] like Figures 1 to 6 As shown, this embodiment provides a buoyant marine pile foundation pull-out detection device, which includes a pile foundation spring-type clamp device 2, a beam 3 and a dynamic positioning raft 8, one on each side of the dynamic positioning raft 8, with the beam 2 horizontally arranged in the middle, and the pile foundation spring-type clamp device 2 fixed in the middle of the beam 3.

[0040] The pile foundation spring type clamp device 2 includes an inner clamp 12 and an outer clamp 13. The inner clamp 12 clamps the pile foundation. A groove is arranged on the outer side of the inner clamp 12 and the inner side of the outer clamp 13. The inner clamp 12 and the outer clamp 13 are connected as a whole by using a plurality of compressed springs 14 fixed in the groove. A beam 3 is horizontally placed on the beam pad 7. A steel disc 4 is placed at a position coaxial with the pile foundation at the center of the upper surface of the beam 3. Fig. 9 Four through holes 21 are provided on the disc 4, and the steel bars 5 pass through the through holes 21. The upper end of the steel bars 5 is fixed by the sleeve 22, and the lower end of the steel bars 5 is fixed by the fixed sleeve 11 provided on the outer wall of the inner hoop 12; a seawater storage tank 9 and a water pump 10 are provided on the dynamic positioning raft 8, and the two rafts pump out seawater from the seawater storage tank 9 in equal amounts through the water pump 10.

[0041] The outer hoop 13 includes an outer reinforcing rib 15, an inner groove 19 of the outer hoop, a spring 14, an outer steel plate 27 of the outer hoop and screw holes 25. The reinforcing rib 15 is arranged in 8 groups between the curved surface and the plane, the inner groove 19 of the outer hoop is arranged in 6-9 groups along the inner circumference of the outer hoop, the spring 14 is fixed in the inner groove 19 of the outer hoop, and 8-10 groups of screw holes 25 are arranged on the outer steel plate 27 of the outer hoop.

[0042] The inner hoop 12 includes a fixing sleeve 11, an outer groove 18 of the inner hoop, a spring 14, screw holes 25, an outer steel plate 24 of the inner hoop and an inner steel plate 23 of the inner hoop. The inner surface of the inner hoop 12 is rough. The fixing sleeve 11 is symmetrically arranged along the circumference of the outer side of the inner hoop 12. The outer groove 18 of the inner hoop is arranged in 6-9 groups along the outer circumference of the inner hoop 12. The spring 14 is fixed to the outer groove 18 of the inner hoop. The thickness of the outer steel plate 24 of the inner hoop is less than the thickness of the inner steel plate 23 of the inner hoop. The number of screw holes 25 provided is greater than the number of screw holes 25 provided on the inner steel plate 23 of the inner hoop. When assembling the entire pile foundation spring clamp type device 2, the thickness of the outer steel plate 27 of the outer hoop is the same as the thickness of the outer steel plate 24 of the inner hoop, which is exactly the same as the thickness of the inner steel plate 23 of the inner hoop. The outer hoop 13 and the inner hoop 12 form a whole with consistent thickness through the thickness difference. The outer hoop outer steel plate 27 improves the rigidity of the connection between the outer hoop 13 and the inner hoop 12 by providing more screw holes 25 , so as to better resist the elastic force between the inner hoop 12 and the outer hoop 13 .

[0043] The beam 3 is placed at the half position in the length direction of the rectangular seawater storage tank 9 on the dynamic positioning raft 8, and multiple levels are arranged on the upper surface of the beam 3. This placement method can ensure that the raft is balanced in force during the detection process.

[0044] The size of the sleeve 22 is larger than the diameter of the through hole 21 on the disc 4. The upper and lower ends of the steel bar 5 have straight threads. The diameter of the steel bar 5 is slightly smaller than the diameter of the through hole 21 on the disc 4. Figures 9-10 The steel bar 5 passes through the through hole 21 on the disc 4 and is connected and fixed with the sleeve 22. The disc 4 is directly placed on the beam 3, and the reaction force provided by the sleeve 22 fixes the steel bar so that the disc 4 and the beam 3 are in close contact.

[0045] The beam pad 7 is a stone rectangular shape, and 1-4 groups are stacked in the vertical direction. The beam pad 7 mainly adjusts the height of the beam 3 so that the upper surface of the beam 3 is in close contact with the sleeve 22 that fixes the steel bar 5.

[0046] like Figure 1The dynamic positioning raft 8 is provided with a dynamic positioning system and a raft level ruler 35. The dynamic positioning system calculates and generates thrust to position the dynamic positioning raft 8 in the sea based on the external environment data collected by the sensor group. The dynamic positioning system includes a bow thruster 28, an azimuth thruster 29, a sonar positioning system 30, a differential GPS 31, an anemometer 32, a heading sensor 33 and a motion sensor 34. The anemometer 32 is used to calculate the wind force, wind speed and wind direction acting on the hull, and to compensate before the wind causes the position and heading of the ship to change. A typical anemometer 32 measures wind force and wind speed, and a wind vane is used to measure wind direction. The motion sensor 34 is used to perform accurate marine dynamic measurements, high-precision sway, turbulence and surge measurements. The bow thruster 28 is located on both sides of the hull near the bow and the stern, with two bow thrusters 28 distributed at the bow and the stern respectively. The azimuth thruster 29 is located in the middle of the bottom of the ship, and each ship is equipped with two azimuth thrusters 29. The sonar positioning system 30 is located in the middle of the bottom of the ship away from the azimuth thruster 29. The anemometer 32 and the differential GPS 31 are both located on the mast; the heading sensor 33 measures the bow and yaw, and is made according to the axis fixity and precession of the gyroscope, combined with the earth's rotation vector and the gravity vector, using control equipment and damping equipment to provide a true north reference, and is set on the bow and stern line of the dynamic positioning raft 8; the motion sensor 34 is set in the cabin of the dynamic positioning raft 8 near the center of gravity of the ship; the raft level ruler 35 is set on the side of the ship.

[0047] like Figures 7-8 As shown, the size of the sleeve 22 is larger than the diameter of the through hole 21 on the disk.

[0048] The upper and lower ends of the steel bar 5 are all provided with straight threads, and the diameter of the steel bar 5 is slightly smaller than the diameter of the through hole 21 on the disc 4. It is ensured that the upper and lower end sleeves 22 can be smoothly connected to the steel bar 5 by using a steel bar sleeve wrench.

[0049] In this embodiment, the pile foundation 1 adopts a large-diameter steel pipe pile, which has a diameter of 5m, a length of 40m, a wall thickness of 0.06m, and a buried depth of 20m.

[0050] The pile foundation spring clamp device 2 includes an inner hoop 12 and an outer hoop 13. The two symmetrical inner hoops 12 have a diameter of 5m and a wall thickness of 0.3m. A total of 42 grooves are arranged on the outer sides of the two symmetrical inner hoops 12. Every three grooves are in the same vertical row. The diameter of the groove is 0.5m. The inner steel plate 23 of the inner hoop is 0.85m long and the wall thickness is 0.3m. There are 258 screw holes on the inner steel plate 23 of the inner hoop. The screw hole 25 has a diameter of 88mm. The outer steel plate 24 of the inner hoop is 258. 2m, wall thickness 0.15m, two symmetrical outer hoops 13 with a diameter of 3.6m and a wall thickness of 0.3m, the outer fixed sleeve 11 of the inner hoop has a diameter of 88mm, 42 grooves are arranged on the inner sides of the two symmetrical outer hoops 13, every three grooves are in the same vertical row, the groove diameter is 0.5m, the outer steel plate 27 of the outer hoop is 2m long and has a wall thickness of 0.15m, and eight groups of reinforcing ribs 15 are arranged on the outer steel plate 27 of the outer hoop with a length of 2.3m, a width of 2m and a thickness of 0.3m.

[0051] The dynamic positioning raft 8 is a raft equipped with a DP2 power and propulsion system. Each ship is equipped with four bow thrusters 28, two full-turn thrusters 29, a sonar positioning system 30, a wind speed meter 32, a differential GPS 31, a heading sensor 33, a motion sensor 34 and a raft level ruler 35. A sonar signal receiver 20 cooperating with the sonar positioning system 30 is arranged on the seabed. Each dynamic positioning raft 8 weighs 700 tons, the beam pad 7 is 2m long, 2m wide and 1m high, and the beam 3 is 5m wide, 20m long and 1m high.

[0052] The steel disc 4 has a diameter of 5.5 m and a thickness of 0.3 m. The steel bar 5 with straight threads at the upper and lower ends is 7 m long. The straight thread at the upper end of the steel bar 5 is 0.5 m long, and the straight thread at the lower end of the steel bar 5 is 0.5 m long.

[0053] It should be noted that the above dimensions are recommended dimensions given in this embodiment, and the specific dimensions can be adjusted according to actual requirements.

[0054] Example 2

[0055] This embodiment provides a method for installing the buoyancy type marine pile foundation anti-pullout detection device provided in Embodiment 1, comprising the following steps:

[0056] Step 1: Install the inner hoop 12 . After hoisting the inner hoop 12 to a predetermined position outside the pile foundation, two symmetrical inner hoops 12 are connected using nuts 26 and screws 16 .

[0057] Step 2: Install the outer hoop 13, put one end of the spring 14 into the outer groove 18 of the inner hoop, then hang the outer hoop 13 to a position parallel to the inner hoop 12, and install the other end of the spring 14 to the inner groove 19 of the outer hoop. Use the ship as a fixed point again and use 6 to 9 groups of jacks to clamp the two symmetrical outer hoops 13 with equal force to the inner hoop 12 through the compression springs 14, then use the nut 26 and the screw 16 to connect the two symmetrical outer hoops 13, and finally use a steel bar wrench to install the steel bar 5 with straight threads on the upper and lower ends on the fixed sleeve 11.

[0058] Step 3: Install the disc 4. Set up the beam 3 between the two dynamic positioning rafts 8. Place the disc 4 at the center of the upper surface of the beam 3 coaxial with the pile foundation. Then pass the steel bar 5 through the through hole 21. Then use the beam pad 7 to adjust the beam 3 to a suitable height. Finally, use a steel bar sleeve wrench to install the steel bar 5 with straight threads on the upper and lower ends on the sleeve 22.

[0059] Step 4: The dynamic positioning vessel 8 is positioned. First, a sonar signal receiver 20 is placed on the seabed mud surface. Then, the differential GPS 31 and the sonar positioning system 30 are used to accurately position the vessel near the pile to be measured. Next, the bow sensor 33, anemometer 32, and motion sensor 34 on the dynamic positioning vessel 8 are turned on. The bow thruster 28 and the azimuth thruster 29 are controlled according to the data measured by various sensors. Finally, the observation vessel level ruler 35 is started.

[0060] Step 5: Pump out the seawater from the seawater storage tank 9 . The two rafts pump out the seawater from the seawater storage tank 9 in equal amounts through the pumps 10 .

[0061] Step 6: If the pile foundation spring clamp device 2 needs to be disassembled, first use 6 to 9 groups of jacks to apply external force to the two symmetrical outer clamps 13 horizontally and evenly at the same time with the dynamic positioning raft 8 as the fixed point, then remove the screw 16 and the nut 26, and then use the ship as the fixed point to slowly and evenly unload the force horizontally with 6 to 9 groups of jacks at the same time. When the elastic force of the spring 14 is unloaded, remove the outer clamp 13, and finally remove the spring 14 and the inner clamp 12 in sequence.

[0062] The above embodiments are only preferred implementations of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A buoyancy type marine pile foundation pull-out detection device, comprising a clamp device, characterized in that: The invention also comprises two dynamic positioning rafts (8), a beam (3) being arranged horizontally between the two dynamic positioning rafts (8), a disc (4) being fixedly arranged at the center point of the beam (3) and coaxially with the pile foundation; the top of the clamping device is fixed to the bottom of the disc (4) by a plurality of steel bars (5); the clamping device comprises an inner hoop (12) and an outer hoop (13) which are fixedly connected, the inner hoop (12) clamps the pile foundation, a plurality of grooves are arranged correspondingly on the outer side of the inner hoop (12) and the inner side of the outer hoop (13), and the grooves are provided with a plurality of grooves. A compressed spring (14) is arranged inside; the dynamic positioning raft (8) is provided with a dynamic positioning system, and the dynamic positioning system calculates and generates thrust to position the dynamic positioning raft (8) in the sea based on external environmental data collected by a sensor group; the dynamic positioning raft (8) is respectively provided with a seawater storage bin (9) and a water pump (10), and the water pump (10) equally pumps the seawater stored in the seawater storage bin (9) out of the dynamic positioning raft (8) to perform anti-pullout detection of marine pile foundations.

2. The buoyancy type marine pile foundation pull-out detection device according to claim 1, characterized in that: The inner hoop (12) and the outer hoop (13) are both two semicircles, which are connected by symmetrical steel plates extending outward on both sides and fixed by multiple groups of bolts. Reinforcing ribs (15) are provided between the steel plate of the outer hoop (13) and the outer surface of the outer hoop (13).

3. The buoyancy type marine pile foundation pull-out detection device according to claim 2, characterized in that: The outer wall of the inner hoop (12) is evenly provided with fixing sleeves (11), the lower end of the steel bar (5) is fixed by the fixing sleeve (11), and the upper end passes through the evenly distributed through holes of the disc (4) and is fixed by the sleeve (22).

4. The buoyancy type marine pile foundation anti-pulling detection device according to claim 3 is characterized in that: The dynamic positioning raft (8) is provided with a beam pad (7) for adjusting the horizontal position of the beam (3), and the upper surface of the beam (3) is provided with multiple sets of level rulers; the beam is placed at the middle 1 / 2 length of the seawater storage tank (9).

5. The buoyancy type marine pile foundation anti-pulling detection device according to claim 4 is characterized in that: The beam pads (7) are multiple and vertically stacked, and are made of stone; the disc (3) is made of steel.

6. The buoyancy type marine pile foundation pull-out detection device according to claim 5, characterized in that: The dynamic positioning system comprises a bow thruster (28), an azimuth thruster (29), a sonar positioning system (30), an anemometer (32), a differential GPS (31), a heading sensor (33), a motion sensor (34) and a raft level ruler (35). The bow thruster (28) is located at both sides of the hull of the dynamic positioning raft (8) near the bow and stern, and the azimuth thruster (28) is located in the middle of the bottom of the ship. Each dynamic positioning raft (8) is equipped with a Two azimuth thrusters (28), the sonar positioning system (30) is located in the middle of the bottom of the ship away from the azimuth thrusters (28), the sonar signal receiver (20) is arranged on the seabed mud surface; the anemometer (32) and the differential GPS (31) are both located on the mast; the heading sensor (33) is arranged on the bow and stern line of the dynamic positioning raft (8); the motion sensor (34) is arranged in the cabin near the center of gravity of the ship; the raft level ruler (35) is arranged on the side of the ship.

7. A method for installing the buoyancy type marine pile foundation anti-pulling detection device according to claim 6, characterized in that: The following steps are involved: S1: installing the inner hoop, hoisting the inner hoop (12) to a predetermined position outside the pile foundation, and connecting the two semicircular inner hoops 12 with nuts and screws; S2: installing the outer hoop, placing one end of the spring (14) into the outer groove of the inner hoop, then hoisting the outer hoop (13) to a position parallel to the inner hoop (12), and installing the other end of the spring (14) into the inner groove of the outer hoop, again using the ship as a fixed point and using 6 to 9 groups of jacks to clamp the two symmetrical outer hoops (13) to the inner hoop (12) with equal force, then using nuts and screws to connect the two semicircular outer hoops (13), and finally installing the steel bar (5) on the fixed sleeve (11); S3: disc installation, erecting the beam (3) before the two dynamic positioning rafts (8), placing the disc (4) at the center of the upper surface of the beam (3) coaxial with the pile foundation, then passing the steel bar (5) through the through hole, and then using the beam pad (7) to adjust the beam (3) to a suitable height, and finally fixing the top end of the steel bar (5) through the sleeve (22); S4: Dynamic positioning raft positioning, first place a sonar signal receiver (20) on the seabed mud surface, then use differential GPS (31) and sonar positioning system (30) to accurately position near the pile to be measured, then turn on the bow sensor (33), anemometer (32) and motion sensor (34), control the bow thruster (28) and azimuth thruster (29) according to the data measured by various sensors, and finally start observing the raft level rod (35). S5: Pumping out seawater from the seawater storage tank, the two dynamically positioned rafts 8 pump out seawater from the seawater storage tank (9) in equal amounts through the pumping pumps (10); S6: If the clamping device (2) needs to be disassembled, firstly, the dynamic positioning raft (8) is used as a fixed point to use multiple sets of jacks to apply external forces to the two outer hoops (13) horizontally and evenly at the same time, then the screw and nut are removed, and then the dynamic positioning raft (8) is used as a fixed point to use multiple sets of jacks to slowly and evenly unload the force horizontally at the same time. When the elastic force of the spring (14) is completely unloaded, the outer hoop (13) is removed, and finally the spring (14) and the inner hoop (12) are removed in sequence.

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