Offshore static sounding method

Abstract

The invention relates to the technical field of static sounding, and discloses an offshore static sounding method which comprises the following steps: 1) floating a frame on the sea, the frame being provided with a floating structure, a sounding rod and a driving structure; the floating structure and the frame are of an integrated structure, and a sensor is arranged on the sounding rod. 2) dragging the frame to a set working position on the sea; (3) the floating structure is subjected to air exhaust, so that the frame sinks to sediments on the seabed; (4) the driving structure drives the sounding rod to longitudinally penetrate through the set depth in the sediment, and the sensor detects acting force data and transmits the acting force data to the control center; (5) the driving structure drives the feeler lever to be longitudinally lifted up in the sediment till the feeler lever is separated from the sediment; (6) the floating structure is inflated, so that the frame floats upwards to the seawater; through the arrangement of the floating structure, the integration of the integrated frame and the sounding rod, and the real-time data acquisition and transmission technology, the operation efficiency during beach and shallow sea sediment strength in-situ detection is improved.

Description

Technical Field

[0001] This invention patent relates to the technical field of static cone penetration test, and more specifically, to a method for static cone penetration test in the sea. Background Art

[0002] The technology of static cone penetration test in the sea emerged in the 1960s of the 20th century and has a history of more than 50 years. The technology of static cone penetration test in the sea in China started relatively late and is still in the development stage. Although some research institutes and universities in China have developed some equipment for static cone penetration test in the sea, there are generally problems such as low technical maturity and insufficient equipment reliability.

[0003] In the prior art, most of the seabed static cone penetration test equipment requires a complex installation and debugging process. Especially in a complex environment, the deployment and recovery of the equipment require a lot of time and manpower. For example, the drilling type static cone penetration test equipment needs to drill holes first and then conduct the penetration test. This time-sharing operation method not only increases the operation time but also may cause soil disturbance, affecting the accuracy of test data, thus reducing the overall measurement operation efficiency.

[0004] In addition, in the prior art, the degree of automation of data collection and transmission is relatively low, and some equipment still relies on manual operation, resulting in slow data processing speed and poor real-time performance. After the equipment completes the detection, the recovery process is relatively complex. Especially in a complex environment, additional auxiliary devices are required for the floating and fixing of the equipment. Summary of the Invention

[0005] The purpose of the present invention is to provide a method for static cone penetration test in the sea, aiming to solve the problem of low operation efficiency in the prior art during the in-situ detection of the strength of shallow sea sediments.

[0006] The present invention is implemented as follows. A method for static cone penetration test in the sea for in-situ detection of the strength of shallow sea sediments includes the following steps:

[0007] 1), floating the frame on the sea water. The frame is provided with a floating structure that can be inflated to increase buoyancy or deflated to reduce buoyancy, a sounding rod that longitudinally moves to insert into the sediments on the seabed, and a driving structure that drives the sounding rod to longitudinally move;

[0008] The floating structure is fixedly integrated with the frame. The sounding rod is provided with a sensor, and the sensor communicates with the control center;

[0009] 2), dragging the frame on the sea to a set working position;

[0010] 3), deflating the floating structure to make the frame sink into the sea water and sink onto the sediments on the seabed;

[0011] 4) The driving structure drives the feeler rod to penetrate longitudinally into the sediment to a set depth. When the feeler rod penetrates into the sediment, the sensor detects force data and transmits the force data to the control center;

[0012] 5) The driving structure drives the feeler rod to be lifted longitudinally in the sediment until the feeler rod is separated from the sediment;

[0013] 6) Inflate the floating structure to make the frame float on the sea water.

[0014] Furthermore, in step 1), the frame is hollowed out, and both sides of the frame have side parts respectively, and the floating structure is arranged in the side parts and forms an integral structure with the frame;

[0015] In the step 3), the floating structures in the two side parts are simultaneously evacuated to allow the frame to sink synchronously as a whole in the seawater.

[0016] Furthermore, in step 6), the floating structures in the two side parts are inflated synchronously so that the frame floats synchronously as a whole in the seawater.

[0017] Furthermore, the driving structure has a sliding plate that moves longitudinally and a hydraulic structure that drives the sliding plate to move longitudinally, and the sliding plate is provided with a clamping head that clamps the feeler rod longitudinally, and when the clamping head clamps the feeler rod, the feeler rod and the sliding plate are connected as a whole;

[0018] In the step 4), during the process in which the hydraulic structure drives the sliding plate to move longitudinally downward, the feeler rod moves longitudinally downward synchronously with the sliding plate, and the feeler rod penetrates longitudinally downward into the sediment;

[0019] In the step 5), when the hydraulic structure drives the sliding plate to move longitudinally upward, the feeler rod moves longitudinally upward synchronously with the sliding plate, and the feeler rod is lifted longitudinally until the feeler rod is separated from the sediment.

[0020] Furthermore, the hydraulic structure includes an oil cylinder and a pulley block, a cable is wound around the pulley block, the cable has a longitudinal section, and the longitudinal section is connected to the sliding plate;

[0021] In step 4) and step 5), the penetration cylinder drives the pulley block to rotate longitudinally, and the longitudinal section moves longitudinally synchronously, driving the sliding plate to move longitudinally, so that the feeler rod penetrates longitudinally downward or lifts longitudinally.

[0022] Further, the pulley block includes two upper fixed pulleys and two lower fixed pulleys, and the two upper fixed pulleys and the two lower fixed pulleys are arranged at intervals up and down; an upper movable pulley is provided between the two upper fixed pulleys, and a lower movable pulley is provided between the two lower fixed pulleys; the upper movable pulley and the lower movable pulley are arranged at intervals up and down, and the cable is wound around the outer circumferences of the upper fixed pulley, the upper movable pulley, the lower fixed pulley and the lower movable pulley;

[0023] In step 4) and step 5), the penetration oil cylinder drives the lower movable pulley and the upper movable pulley to move longitudinally synchronously, the upper fixed pulley and the lower fixed pulley rotate longitudinally synchronously, and the longitudinal section moves longitudinally synchronously, driving the sliding plate to move longitudinally, so that the sounding rod penetrates or lifts longitudinally.

[0024] Further, the upper movable pulley and the lower movable pulley are relatively fixed to each other and are connected to the penetration oil cylinder, and are driven by the penetration oil cylinder to move longitudinally synchronously.

[0025] Further, the two ends of the cable are fixedly connected, and the longitudinal section is formed in the middle of the cable; in step 4) and step 5), during the process that the lower movable pulley and the upper movable pulley move longitudinally synchronously, the upper fixed pulley and the lower fixed pulley rotate longitudinally synchronously, and the longitudinal section moves longitudinally synchronously.

[0026] Further, the middle part of the frame has a middle position, the driving structure and the sounding rod are arranged in the middle position, and the sounding rod is arranged coincident with the center of the frame; the floating structure includes a plurality of longitudinal cylinders arranged on the frame, and a flexible longitudinal airbag is wrapped on the longitudinal cylinders, and the longitudinal airbag is arranged along the height direction of the longitudinal cylinder and is arranged in a circumferential direction around the longitudinal cylinder;

[0027] The inner side of the longitudinal airbag has an inner circumferential surface, the inner circumferential surface is fixed on the outer circumference of the longitudinal cylinder, the outer side of the longitudinal airbag has an outer circumferential surface, the outer circumferential surface is freely arranged, and the longitudinal airbag is connected to the air charging and pumping device; the bottom surface of the frame has a bottom surface, and an elastic layer is covered on the bottom surface, and a weight mesh layer arranged in a criss-cross manner is provided in the elastic layer, and the weight mesh layer is laid along the transverse direction of the elastic layer;

[0028] The longitudinal airbag penetrates through the elastic layer and has a lower part extending below the elastic layer; in step 3), after the air charging and pumping device pumps air out of the longitudinal airbag, the outer circumferential surface contracts inwards and abuts against the inner circumferential surface, and the lower part contracts into the elastic layer; in step 6), after the air charging and pumping device inflates the longitudinal airbag, the outer circumferential surface expands outwards away from the longitudinal cylinder, and the lower part is inflated into a longitudinal strip shape and extends below the elastic layer.

[0029] Furthermore, the adjacent longitudinal cylinders are arranged at intervals to form a deformation interval. A floating rod with a density smaller than that of seawater is provided in the deformation interval. A plurality of elastic bands are provided on the outer periphery of the floating rod, and the plurality of elastic bands are arranged around the circumference of the floating rod; the inner end of the elastic band is connected to the floating rod, and the outer end of the elastic band is connected to the outer side annular surface;

[0030] In step 3), after the air charging and pumping device pumps air out of the longitudinal airbag, the elastic band is in a stretched state, and the floating plate is pulled and suspended between the plurality of longitudinal airbags; in step 6), after the air charging and pumping device inflates the longitudinal airbag, the elastic band is in a relaxed state, and the floating rod freely floats between the plurality of longitudinal airbags.

[0031] Compared with the prior art, the offshore static cone penetration test method provided by the present invention is used for in-situ detection of the strength of shallow sea sediments. Through the setting of the floating structure, the frame can quickly float and position on the sea surface, and the sinking and floating of the frame can be easily adjusted through inflation and deflation operations, greatly reducing the deployment and recovery time of the equipment. At the same time, the integrated frame structure and the automated operation of driving the cone penetration rod further improve the efficiency and accuracy of the detection process;

[0032] In addition, the real-time communication function between the sensor and the control center ensures the instant transmission and analysis of the acting force data, thereby reducing manual intervention during the detection process, further improving the operation efficiency, and providing a more efficient and convenient technical means for marine engineering exploration. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a schematic flow chart of the offshore static cone penetration test method provided by the present invention for in-situ detection of the strength of shallow sea sediments;

[0034] Figure 2 is a front view schematic diagram of the frame provided by the present invention;

[0035] Figure 3 is a schematic structural diagram of the hydraulic structure provided by the present invention;

[0036] Figure 4 is a schematic structural diagram of the driving structure and the longitudinal airbag provided by the present invention;

[0037] Figure 5 is a demonstration schematic diagram of air pumping and inflation of the longitudinal airbag provided by the present invention;

[0038] In the figure: frame 100, cone penetration rod 101, side part 102, sliding plate 103, clamping head 104, bottom surface 105, elastic layer 106, middle part 107;

[0039] Cable 200, upper fixed pulley 201, lower fixed pulley 202, upper movable pulley 203, lower movable pulley 204, penetration oil cylinder 205, longitudinal section 206;

[0040] Longitudinal cylinder 300, longitudinal airbag 301, inner circumferential surface 302, outer circumferential surface 303, deformation interval 304, floating rod 305, elastic band 306, lower part 307. Detailed implementation mode

[0041] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0042] The implementation of the present invention will be described in detail below with reference to specific embodiments.

[0043] In the attached drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the 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. Therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and cannot be construed as limiting this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0044] Refer to Figures 1-5 As shown, it is a preferred embodiment provided by the present invention.

[0045] A marine static cone penetration test method for in-situ detection of the strength of shallow sea sediments, comprising the following steps:

[0046] 1), floating the frame 100 on the sea water, the frame 100 is provided with a floating structure that can be inflated to increase buoyancy or deflated to reduce buoyancy, a sounding rod 101 that moves longitudinally to insert into the sediments on the seabed, and a driving structure for driving the sounding rod 101 to move longitudinally;

[0047] The floating structure is fixedly integrated with the frame 100, and a sensor is provided on the sounding rod 101, and the sensor communicates with the control center;

[0048] 2), dragging the frame 100 on the sea to a set working position;

[0049] 3), deflating the floating structure to make the frame 100 sink into the sea water and sink onto the sediments on the seabed;

[0050] 4) The driving structure drives the feeler rod 101 to penetrate the sediment longitudinally to a set depth. When the feeler rod 101 penetrates the sediment, the sensor detects the force data and transmits the force data to the control center;

[0051] 5) The driving structure drives the feeler rod 101 to be lifted longitudinally in the sediment until the feeler rod 101 is separated from the sediment;

[0052] 6) Inflate the floating structure to make the frame 100 float on the sea water.

[0053] The offshore static penetration method provided above is used for in-situ detection of the strength of shallow sea sediments. By setting a floating structure, the frame 100 can quickly float and position on the sea surface, and the sinking and floating of the frame 100 can be easily adjusted by inflation and exhaust operations, which greatly reduces the deployment and recovery time of the equipment. At the same time, the integrated frame 100 structure and the automated operation of driving the penetration rod 101 further improve the efficiency and accuracy of the detection process.

[0054] In addition, the real-time communication function between the sensor and the control center ensures the instant transmission and analysis of force data, thereby reducing human intervention in the detection process, further improving operational efficiency, and providing more efficient and convenient technical means for marine engineering surveys.

[0055] In this embodiment, in step 1), the frame 100 is hollowed out, and the two sides of the frame 100 have side parts 102 respectively, and the floating structure is arranged in the side parts 102 and forms an integral structure with the frame 100;

[0056] In step 3), the floating structures in the two side parts 102 are simultaneously evacuated to allow the frame 100 to sink synchronously in the seawater as a whole.

[0057] By setting floating structures on both sides of the frame 100, it is possible to ensure that the frame 100 maintains good balance and stability in the seawater. Synchronous air pumping allows the frame 100 to sink quickly and smoothly as a whole to above the seabed sediment, reducing shaking and deviation during the sinking process and improving the accuracy of equipment positioning, thereby providing a more stable platform for subsequent detection work and improving work efficiency.

[0058] In this embodiment, in step 6), the floating structures in the two side parts 102 are inflated synchronously, so that the frame 100 floats synchronously as a whole in the seawater.

[0059] In this way, the frame 100 can float to the sea surface quickly and smoothly as a whole, reducing shaking and deviation during the floating process, which not only improves the efficiency of equipment recovery, but also reduces potential risks caused by unstable equipment recovery, further improving the overall efficiency of the operation.

[0060] In this embodiment, the driving structure has a sliding plate 103 that moves longitudinally and a hydraulic structure that drives the sliding plate 103 to move longitudinally. A clamping head 104 for longitudinally clamping the sounding rod 101 is provided on the sliding plate 103. After the clamping head 104 clamps the sounding rod 101, the sounding rod 101 is connected to the sliding plate 103 as a whole;

[0061] In step 4), during the process that the hydraulic structure drives the sliding plate 103 to move longitudinally downward, the sounding rod 101 synchronously moves longitudinally downward with the sliding plate 103, and the sounding rod 101 longitudinally penetrates into the sediment;

[0062] In step 5), during the process that the hydraulic structure drives the sliding plate 103 to move longitudinally upward, the sounding rod 101 synchronously moves longitudinally upward with the sliding plate 103, and the sounding rod 101 is longitudinally lifted until it disengages from the sediment.

[0063] By driving the longitudinal movement of the sliding plate 103 through the hydraulic structure, the precise penetration and lifting operations of the sounding rod 101 are realized, which not only improves the movement accuracy of the sounding rod 101, but also reduces the error of manual operation, ensuring the reliability of the detection data. In addition, the automated operation of hydraulic drive further improves the operation efficiency and reduces the time and labor costs during the detection process.

[0064] In this embodiment, the hydraulic structure includes a penetration oil cylinder 205 and a pulley block. A cable 200 is wound around the pulley block. The cable 200 has a longitudinal section 206, and the longitudinal section 206 is connected to the sliding plate 103;

[0065] In step 4) and step 5), the penetration oil cylinder 205 drives the pulley block to rotate longitudinally, and the longitudinal section 206 synchronously moves longitudinally, driving the sliding plate 103 to move longitudinally, so that the sounding rod 101 penetrates longitudinally downward or is longitudinally lifted.

[0066] Through the combined action of the penetration oil cylinder 205 and the pulley block, the output of hydraulic power can be effectively amplified, ensuring that the sliding plate 103 has sufficient driving force during the longitudinal movement, thereby increasing the penetration and lifting speeds of the sounding rod 101, reducing the risk of operation failure caused by insufficient power, and improving the efficiency and reliability of the detection process.

[0067] In this embodiment, the pulley block includes two upper fixed pulleys 201 and two lower fixed pulleys 202. The two upper fixed pulleys 201 and the two lower fixed pulleys 202 are arranged at intervals up and down; there is an upper movable pulley 203 between the two upper fixed pulleys 201, and there is a lower movable pulley 204 between the two lower fixed pulleys 202; the upper movable pulley 203 and the lower movable pulley 204 are arranged at intervals up and down, and the cable 200 is wound around the outer circumferences of the upper fixed pulley 201, the upper movable pulley 203, the lower fixed pulley 202, and the lower movable pulley 204;

[0068] In step 4) and step 5), under the drive of the penetration oil cylinder 205, the lower movable pulley 204 and the upper movable pulley 203 move longitudinally synchronously, the upper fixed pulley 201 and the lower fixed pulley 202 rotate longitudinally synchronously, and the longitudinal section 206 moves longitudinally synchronously, driving the sliding plate 103 to move longitudinally, so that the sounding rod 101 penetrates vertically downward or is lifted vertically upward.

[0069] Through the design of the multi-pulley group, the force distribution of the cable 200 is further optimized, and the friction and wear of the cable 200 during movement are reduced. This design not only improves the service life of the equipment, but also ensures the smoothness of the sliding plate 103 during longitudinal movement, further improving the penetration and lifting efficiency of the sounding rod 101 and reducing the energy loss during operation.

[0070] In this embodiment, the upper movable pulley 203 and the lower movable pulley 204 are relatively fixed to each other and are connected to the penetration oil cylinder 205, and are driven by the penetration oil cylinder 205 to move longitudinally synchronously.

[0071] In this way, it can effectively avoid the problems of cable 200 twisting or jamming caused by asynchronous operation of the pulley group during operation, improve the stability and reliability of the equipment operation, and reduce the risk of operation interruption caused by equipment failure.

[0072] In this embodiment, both ends of the cable 200 are fixedly connected, and the longitudinal section 206 is formed in the middle of the cable 200; in step 4) and step 5), during the synchronous longitudinal movement of the lower movable pulley 204 and the upper movable pulley 203, the upper fixed pulley 201 and the lower fixed pulley 202 rotate longitudinally synchronously, and the longitudinal section 206 moves longitudinally synchronously.

[0073] The design of fixedly connecting both ends of the cable 200 ensures the stability of the longitudinal section 206 during movement and reduces the telescopic deformation of the cable 200 during force application. This design not only improves the service life of the cable 200, but also ensures the accuracy of the sliding plate 103 during longitudinal movement, further improving the penetration and lifting efficiency of the sounding rod 101 and reducing the error during detection.

[0074] In this embodiment, the middle part of the frame 100 has a middle position 107, the driving structure and the sounding rod 101 are arranged in the middle position 107, and the sounding rod 101 is arranged concentrically with the center of the frame 100; the floating structure includes a plurality of longitudinal cylinders 300 arranged on the frame 100, and a flexible longitudinal airbag 301 is wrapped on the longitudinal cylinders 300. The longitudinal airbag 301 is arranged along the height direction of the longitudinal cylinder 300 and is arranged circumferentially around the longitudinal cylinder 300;

[0075] The inner side of the longitudinal airbag 301 has an inner annular surface 302, and the inner annular surface 302 is fixed to the outer periphery of the longitudinal cylinder 300. The outer side of the longitudinal airbag 301 has an outer annular surface 303, and the outer annular surface 303 is freely arranged. The longitudinal airbag 301 is connected to the air charging and pumping device; the bottom of the frame 100 has a bottom surface 105, and an elastic layer 106 is covered on the bottom surface 105. A weight net layer with a criss-cross pattern is provided in the elastic layer 106, and the weight net layer is laid along the transverse direction of the elastic layer 106;

[0076] The longitudinal airbag 301 passes through the elastic layer 106 and has a lower part 307 extending below the elastic layer 106; in step 3), after the air charging and pumping device evacuates the longitudinal airbag 301, the outer annular surface 303 shrinks inward and abuts against the inner annular surface 302, and the lower part 307 shrinks into the elastic layer 106; in step 6), after the air charging and pumping device inflates the longitudinal airbag 301, the outer annular surface 303 expands circumferentially away from the longitudinal cylinder 300, and the lower part 307 is inflated into a longitudinal strip shape and extends below the elastic layer 106.

[0077] By arranging a driving structure and a sounding rod 101 in the middle of the frame 100 and making them coincide with the center of the frame 100, the balance and stability of the device during operation can be ensured. The design of the longitudinal airbag 301 not only provides adjustable buoyancy, but also further enhances the stability of the frame 100 on the seabed through the cooperation of the elastic layer 106 and the weight net layer. This design not only improves the adaptability of the device under different water depth conditions, but also reduces the detection error caused by the shaking of the device, and improves the operation efficiency and data reliability.

[0078] In this embodiment, the adjacent longitudinal cylinders 300 are arranged at intervals to form a deformation interval 304. A floating rod 305 with a density smaller than that of seawater is provided in the deformation interval 304. A plurality of elastic bands 306 are provided on the outer periphery of the floating rod 305, and the plurality of elastic bands 306 are arranged around the floating rod 305 circumferentially; the inner ends of the elastic bands 306 are connected to the floating rod 305, and the outer ends of the elastic bands 306 are connected to the outer annular surface 303;

[0079] In step 3), when the air charging and pumping device evacuates the longitudinal airbag 301, the elastic bands 306 are in a stretched state, and the floating plate is pulled and suspended between the plurality of longitudinal airbags 301; in step 6), when the air charging and pumping device inflates the longitudinal airbag 301, the elastic bands 306 are in a relaxed state, and the floating rod 305 freely floats between the plurality of longitudinal airbags 301.

[0080] By arranging the floating rod 305 and the elastic band 306 between the longitudinal cylinder 300, the buoyancy distribution of the equipment can be optimized. During the vacuuming process, the stretched state of the elastic band 306 can ensure that the floating rod 305 is stably suspended, reducing the shaking of the equipment during the sinking process; and during the inflation process, the relaxed state of the elastic band 306 can ensure that the floating rod 305 is freely suspended, reducing the resistance of the equipment during the floating process, which not only improves the stability of the equipment in different operation stages, but also further improves the operating efficiency.

[0081] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for marine static cone penetration test, characterized in that, For in-situ detection of the strength of shallow sea sediments, it includes the following steps: 1). Float the frame on the sea water. The frame is provided with a floating structure that can be inflated to increase buoyancy or deflated to reduce buoyancy, a sounding rod that longitudinally moves to insert into the sediments on the seabed, and a driving structure that drives the sounding rod to longitudinally move; The floating structure is fixedly integrated with the frame. The sounding rod is provided with sensors, and the sensors communicate with the control center; 2). Drag the frame on the sea to the set working position; 3). Deflate the floating structure so that the frame sinks into the sea water and sinks onto the sediments on the seabed; 4). The driving structure drives the sounding rod to longitudinally penetrate a set depth in the sediments. During the process of the sounding rod penetrating into the sediments, the sensors detect the acting force data and transmit the acting force data to the control center; 5). The driving structure drives the sounding rod to longitudinally lift in the sediments until the sounding rod disengages from the sediments; 6). Inflate the floating structure so that the frame floats onto the sea water.

2. The offshore static cone penetration test method according to claim 1, characterized in that, In step 1), the frame is in a hollow shape. Both sides of the frame respectively have side parts. The floating structure is arranged in the side parts and forms an integrated structure with the frame; In step 3), the floating structures in the two side parts are deflated synchronously so that the frame sinks synchronously as a whole in the sea water.

3. The offshore static cone penetration test method according to claim 2, characterized in that, In step 6), the floating structures in the two side parts are inflated synchronously so that the frame floats synchronously as a whole in the sea water.

4. The offshore static cone penetration test method according to any one of claims 1-3, characterized in that The driving structure has a sliding plate that longitudinally moves and a hydraulic structure that drives the sliding plate to longitudinally move. The sliding plate is provided with a clamping head that longitudinally clamps the sounding rod. After the clamping head clamps the sounding rod, the sounding rod is connected to the sliding plate as an integrated body; In step 4), during the process of the hydraulic structure driving the sliding plate to longitudinally move downward, the sounding rod synchronously moves longitudinally downward with the sliding plate, and the sounding rod longitudinally penetrates into the sediments; In step 5), during the process of the hydraulic structure driving the sliding plate to longitudinally move upward, the sounding rod synchronously moves longitudinally upward with the sliding plate, and the sounding rod longitudinally lifts until the sounding rod disengages from the sediments.

5. The offshore static cone penetration test method according to claim 4, wherein The hydraulic structure includes a penetration oil cylinder and a pulley block. A cable is wound around the pulley block. The cable has a longitudinal section, and the longitudinal section is connected to the sliding plate; In step 4) and step 5), the penetration oil cylinder drives the pulley block to longitudinally rotate, and the longitudinal section synchronously moves longitudinally, driving the sliding plate to longitudinally move, so that the sounding rod longitudinally penetrates or longitudinally lifts.

6. The offshore static cone penetration test method according to claim 5, wherein, The pulley block includes two upper fixed pulleys and two lower fixed pulleys. The two upper fixed pulleys and the two lower fixed pulleys are arranged at intervals up and down; there is an upper movable pulley between the two upper fixed pulleys, and there is a lower movable pulley between the two lower fixed pulleys; the upper movable pulley and the lower movable pulley are arranged at intervals up and down, and the cable is wound around the outer circumferences of the upper fixed pulley, the upper movable pulley, the lower fixed pulley, and the lower movable pulley; In step 4) and step 5), under the drive of the penetration oil cylinder, the lower movable pulley and the upper movable pulley move longitudinally synchronously, the upper fixed pulley and the lower fixed pulley rotate longitudinally synchronously, and the longitudinal section moves longitudinally synchronously, driving the sliding plate to move longitudinally, so that the sounding rod penetrates or lifts longitudinally.

7. The marine static cone penetration test method according to claim 6, characterized in that, The upper movable pulley and the lower movable pulley are relatively fixed to each other and connected to the penetration oil cylinder, and are driven by the penetration oil cylinder to move longitudinally synchronously.

8. The offshore static cone penetration test method according to any one of claims 5-7, characterized in that, The two ends of the cable are fixedly connected, and the longitudinal section is formed in the middle of the cable; in step 4) and step 5), during the synchronous longitudinal movement of the lower movable pulley and the upper movable pulley, the upper fixed pulley and the lower fixed pulley rotate longitudinally synchronously, and the longitudinal section moves longitudinally synchronously.

9. The offshore static cone penetration test method according to any one of claims 1 to 3, characterized in that The middle part of the frame has a middle position, the driving structure and the sounding rod are arranged in the middle position, and the sounding rod is arranged coincident with the center of the frame; the floating structure includes a plurality of longitudinal cylinders arranged on the frame, and a flexible longitudinal airbag is wrapped on the longitudinal cylinder. The longitudinal airbag is arranged along the height direction of the longitudinal cylinder and surrounds the longitudinal cylinder circumferentially; The inner side of the longitudinal airbag has an inner ring surface, the inner ring surface is fixed on the outer periphery of the longitudinal cylinder, the outer side of the longitudinal airbag has an outer ring surface, the outer ring surface is freely arranged, and the longitudinal airbag is connected to the air charging and pumping device; the bottom of the frame has a bottom surface, and an elastic layer is covered on the bottom surface. A weight net layer with criss-cross arrangement is provided in the elastic layer, and the weight net layer is laid along the transverse direction of the elastic layer; The longitudinal airbag passes through the elastic layer and has a lower part extending below the elastic layer; in step 3), after the air charging and pumping device pumps air out of the longitudinal airbag, the outer ring surface contracts inwards and abuts against the inner ring surface, and the lower part contracts into the elastic layer; in step 6), after the air charging and pumping device inflates the longitudinal airbag, the outer ring surface expands circumferentially away from the longitudinal cylinder towards the outside, and the lower part is inflated into a longitudinal strip shape and extends below the elastic layer.

10. The offshore static cone penetration test method according to claim 9, wherein, Adjacent longitudinal cylinders are arranged at intervals, forming a deformation interval, and a floating rod with a density smaller than that of seawater is arranged in the deformation interval. A plurality of elastic bands are arranged on the outer periphery of the floating rod, and the plurality of elastic bands surround the floating rod circumferentially; the inner end of the elastic band is connected to the floating rod, and the outer end of the elastic band is connected to the outer ring surface; In step 3), after the air charging and pumping device pumps air out of the longitudinal airbag, the elastic band is in a stretched state, and the floating plate is pulled and suspended between the plurality of longitudinal airbags; in step 6), after the air charging and pumping device inflates the longitudinal airbag, the elastic band is in a relaxed state, and the floating rod freely floats between the plurality of longitudinal airbags.

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