Bottom hole static penetration device

Abstract

The present invention discloses a bottom hole static sounding penetration device, comprising: a casing assembly; a hoisting assembly, which is movably sleeved in the casing assembly; a positioning assembly, which is detachably limited and sleeved in the casing assembly, and the positioning assembly is fixed to the hoisting assembly; a screw drive assembly, which comprises: a motor cylinder, which is fixed on the positioning assembly, a motor is provided in the motor cylinder along the axial sliding direction, and the motor drives the screw to rotate; a screw cylinder, which is connected and fixed to the lower end of the motor cylinder, the upper end of the screw cylinder is fixed to a nut on the screw, a bearing assembly is provided in the screw cylinder along the axial sliding direction, and the lower end of the screw is fixed to the bearing assembly; a sounding assembly, which comprises a probe and a probe, and the upper end of the probe is fixed to the bearing assembly. The present invention changes the complex hydraulic system oil supply and the huge mechanical power transmission system of traditional penetration equipment, reduces construction intensity, improves exploration and construction efficiency, controls the consistency of penetration and lifting speed, and makes the measured side wall friction resistance more accurate.

Description

Technical Field

[0001] The present invention relates to the field of marine geological exploration, and more particularly to a bottom hole static penetration device. Background Art

[0002] Offshore wind farm construction requires a detailed understanding of the soil characteristics of each seabed layer within the project area, determining the engineering properties of each layer and determining pile foundation parameters. At first-level offshore engineering survey sites, static cone penetration (CPT) using probes is one of the most accurate methods. Traditional CPT penetration techniques primarily utilize equipment such as cylinder penetration and extrusion wheel penetration. These devices require numerous probes and are prone to bending and breaking. Construction in deeper waters requires frequent probe replacement, reducing efficiency. Traditional CPT equipment is complex, bulky, and difficult to precisely control and provide penetration force and speed. This results in variable sidearm friction resistance values ​​measured by the probe depending on the velocity difference between the probe lifting and penetration. Comparing the sidewall friction resistance values ​​measured during penetration and lifting at the same probe speed is a crucial metric for data analysis. The smaller the difference between the penetration and lifting speeds, the more accurate the values ​​are. Therefore, existing CPT equipment requires further improvement to overcome these limitations. Summary of the Invention

[0003] An object of the present invention is to solve at least the above problems and to provide at least the advantages which will be described hereinafter.

[0004] In order to achieve these purposes and other advantages according to the present invention, a bottom hole static penetration device is provided, comprising:

[0005] casing assembly;

[0006] A lifting assembly, which is movably sleeved in the sleeve assembly;

[0007] A positioning assembly, wherein a detachable limiting sleeve is arranged in the sleeve assembly, and the positioning assembly is fixed to the lifting assembly;

[0008] A screw drive assembly comprising:

[0009] A motor cylinder is fixed to the positioning assembly, wherein a motor is axially slidably arranged in the motor cylinder, and the motor drives a lead screw to rotate;

[0010] A screw cylinder, which is connected and fixed to the lower end of the motor cylinder, the upper end of the screw cylinder is fixed to the nut on the screw, a bearing assembly is provided in the screw cylinder for axial sliding, and the lower end of the screw is fixed to the bearing assembly;

[0011] The feeler assembly comprises a probe rod and a probe fixed to the lower end of the probe rod, and the upper end of the probe rod is fixed to the bearing assembly.

[0012] Preferably, the positioning component includes:

[0013] A boss, which is annular in shape, is provided on the sleeve assembly and is located above the boss;

[0014] A sliding sleeve is fixed to the hoisting assembly and is axially slidably inserted into the sleeve assembly, wherein a waist-shaped groove is formed on a side wall of the sliding sleeve;

[0015] A connecting sleeve is axially slidably inserted into the sliding sleeve, an accommodating groove is provided on the outer wall of the connecting sleeve, a limiting screw is provided on the accommodating groove and radially extends into the waist-shaped groove, wherein the motor cylinder is fixed to the connecting sleeve;

[0016] A positioning block, the lower end of which is radially rotatably connected to the connecting sleeve and located inside the accommodating groove, and the upper end of which is fixed to the side wall of the accommodating groove via a spring, the outer side wall of the positioning block being configured as an inclined surface, and the radial dimension of the positioning block increasing sequentially from bottom to top;

[0017] When the connecting sleeve moves upward to the end point relative to the sliding sleeve, the upper end of the positioning block extends out of the waist-shaped groove and abuts against the bottom surface of the boss, the limit screw abuts against the sliding sleeve, and the positioning assembly is in a positioning state;

[0018] When the sliding sleeve moves upward to the end point relative to the connecting sleeve, the lower end of the sliding sleeve presses the positioning block radially inward, and the spring is compressed until the positioning block is accommodated in the sliding sleeve, and the positioning assembly is in a released positioning state.

[0019] Preferably, it also includes:

[0020] a magnet induction sleeve, which is provided on the sleeve assembly and located above the boss;

[0021] The magnetic sensing element is arranged on the sounding assembly. When the sounding assembly reaches a preset position on the seabed, the magnetic sensing element senses the magnetic induction sleeve and emits a magnetic induction electrical signal.

[0022] Preferably, it also includes a connecting sleeve, which has threads on its upper outer wall and lower inner wall, and corresponding threads on the lower inner wall of the motor cylinder and the upper outer wall of the screw cylinder, and the upper and lower ends of the connecting sleeve are respectively fixed to the motor cylinder and the screw cylinder threads.

[0023] Preferably, the radial cross-sections of the inner cavities of the motor cylinder and the screw cylinder are both waist-shaped holes, and the radial cross-sections of the motor and the bearing assembly are circumferentially waist-shaped holes that are adapted to the radial cross-sections of the motor cylinder and the screw cylinder.

[0024] Preferably, a plurality of threaded holes are provided on the lower end surface of the bearing assembly, an annular plate is radially protruded on the upper end surface of the probe rod, a plurality of through holes are provided on the annular plate, and the plurality of through holes and the plurality of threaded holes are fixed one by one by bolts.

[0025] Preferably, it also includes a guide sealing sleeve, which is axially slidably arranged in the sleeve assembly, and the guide sealing sleeve includes a guide sleeve axially slidably sleeved on the outside of the probe rod and a plurality of sealing rings fixed on the guide sleeve, the sealing rings are sealingly and slidably connected to the side wall of the probe rod, and the upper end of the guide sleeve is fixed to the lower end of the screw cylinder.

[0026] Preferably, the casing assembly comprises a plurality of casings that are detachably connected in sequence and a casing drill bit screwed onto the casing at the bottom.

[0027] Preferably, the boss is formed by expanding the side wall of the lower end of one of the sleeves outward.

[0028] Preferably, the hoisting assembly includes a housing fixed to the positioning assembly and an umbilical cable provided on the housing, the umbilical cable includes a steel wire rope, a data cable, and a sealing layer for sealing the steel wire rope and the data cable, the data cable sequentially passes through the housing and the positioning assembly and is connected to a data cable connector located in the motor cylinder, and a section of the data cable located in the motor cylinder is spiral-shaped;

[0029] The motor shaft of the motor, the lead screw, the bearing assembly, and the probe rod are all provided with axial through holes, and the data cable connected to the other end of the data cable connector passes through the through holes and is connected to the probe.

[0030] The present invention has at least the following beneficial effects:

[0031] First, traditional probe penetration mainly uses equipment such as oil cylinder penetration and extrusion wheel penetration. The use of these devices requires a large number of probes, and the probes are prone to bending and breaking. In construction in deeper waters, it is necessary to switch probes many times, which reduces construction efficiency. The structure of traditional penetration equipment is complex, and the volume and mass are both large. The present invention uses an electric motor as power to penetrate the probe in the casing, replacing the complex hydraulic system oil supply and the huge mechanical power transmission system of the traditional penetration equipment, reducing construction intensity, and improving exploration and construction efficiency. It is suitable for static penetration surveys in deeper waters.

[0032] Second, improve the collection and analysis of penetration data: the penetration force and penetration speed of traditional penetration equipment cannot be accurately controlled and provided, resulting in different differences in the side arm friction resistance collected by the probe due to the speed difference between the probe rod lifting and penetration; the comparison of the side wall friction resistance collected when the probe rod penetrates and lifts at the same speed is an important indicator for data analysis. Only when the difference between the penetration speed and the lifting speed is smaller, the collected before and after values ​​will be more accurate; this device controls the penetration and lifting speeds of the screw rod by the motor to be consistent, thereby reducing the influence of various external factors such as oil pressure and water pressure on the penetration or lifting speed of traditional penetration equipment, thereby making the detected side wall friction resistance more accurate than that of traditional penetration equipment, so that the accuracy of data collection can be guaranteed, and the analysis results of the data collected by the probe rod can accurately reflect the geological conditions of the surveyed stratum.

[0033] Third, the use of this device to replace traditional probe rod penetration equipment has changed the construction process of traditional probe rods, and a 2-4m probe rod has replaced the 70-80m probe rod required in traditional deep-sea probe rod penetration construction; during the construction of this device, the problems of traditional probe rod penetration due to the large number of probe rods and low construction efficiency have been eliminated; traditional probe rod penetration equipment is prone to problems such as probe rod bending and breaking, complex and bulky survey equipment, and low construction efficiency; this device and traditional probe rod penetration equipment have a simple equipment structure, significantly simplified construction process, significantly improved construction efficiency, and significantly shortened construction period in the survey of wind power projects in deeper waters.

[0034] Other advantages, objectives and features of the present invention will be reflected in part from the following description and will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 An axial cross-sectional view of the sleeve assembly according to one of the technical solutions of the present invention;

[0036] Figure 2 This is a schematic diagram of the overall structure of the penetration device according to one of the technical solutions of the present invention;

[0037] Figure 3 A schematic side structural diagram of the hoisting assembly according to one of the technical solutions of the present invention;

[0038] Figure 4 A detailed view of the positioning assembly according to one of the technical solutions of the present invention;

[0039] Figure 5 A detailed view of the screw drive assembly according to one of the technical solutions of the present invention;

[0040] Figure 6 A detailed view of the bearing assembly and the guide seal sleeve according to one of the technical solutions of the present invention;

[0041] Figure 7 This is a schematic diagram of the positioning assembly in one of the technical solutions of the present invention when it is in a positioning state;

[0042] Figure 8 This is a schematic diagram of the positioning assembly according to one of the technical solutions of the present invention when it is in a released positioning state;

[0043] Figure 9 This is a schematic diagram of the connection between the screw cylinder and the probe rod according to one of the technical solutions of the present invention;

[0044] Figure 10 This is a schematic diagram of the connection between the motor cylinder and the motor according to one of the technical solutions of the present invention. DETAILED DESCRIPTION

[0045] The present invention will be described in further detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0046] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified; in the description of the present invention, the orientation or positional relationship indicated by the terms is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0047] like Figures 1 to 10 As shown, the meanings of the accompanying drawings in the specification of the present invention are as follows: casing assembly 100, lifting assembly 200, positioning assembly 300, screw drive assembly 400, motor cylinder 40, motor 41, screw 42, screw cylinder 43, nut 44, bearing assembly 45, probe assembly 500, probe rod 50, probe 51, boss 30, sliding sleeve 31, waist-shaped groove 32, connecting sleeve 33, accommodating groove 34, limit screw 35, positioning block 36, spring 37, magnet sensing sleeve 56, connecting sleeve 46, annular plate 52, guide sealing sleeve 55, guide sleeve 53, sealing ring 54, casing 11, casing drill bit 12, housing 20, umbilical cable 21, data cable 22, data cable connector 23.

[0048] like Figures 1 to 10 As shown, the present invention provides a bottom hole static penetration device, comprising:

[0049] Casing assembly 100; specifically, the casing assembly 100 comprises multiple sections of detachably connected casing 11, with a casing drill bit 12 threaded onto the bottom section of casing 11. The casing 11 are also threaded together, facilitating both removal and connection. The casing drill bit 12 is used to drill into the seabed to the depth of one (or more) sections of the sounding rod 50, reaching the static survey surface, before the sounding rod 50 is used for penetration survey.

[0050] The hoisting assembly 200 is movably mounted within the sleeve assembly 100. The hoisting assembly 200 is used to bear the load of multiple components, including the probe 50, and to transmit data. Specifically, the hoisting assembly 200 includes a housing 20 fixed to the positioning assembly 300 and an umbilical cable 21 mounted on the housing 20. The umbilical cable 21 includes a steel wire rope, a data cable 22, and a sealing layer that seals the steel wire rope and the data cable 22. The steel wire rope is fixed to the housing 20 and is used to bear the weight load. The data cable 22 is used to transmit various collected signals.

[0051] The positioning assembly 300, whose detachable limiting sleeve is arranged in the casing assembly 100, is fixed to the hoisting assembly 200. The positioning assembly 300 is used to position and fix the screw drive assembly 400 in the casing 11 during the penetration of the probe rod 50, so that the probe rod 50 can penetrate downward for investigation. After the investigation is completed, the positioning and fixation can be quickly released and then hoisted onto the deck of the construction vessel to complete the preparation work before the next frequency investigation and construction.

[0052] Specifically, the positioning component 300 can be implemented in the following ways, including:

[0053] The boss 30 is in the shape of a circular ring and is arranged on the sleeve assembly 100. The boss 30 is used to axially abut and limit the upward movement of the screw drive assembly 400, thereby playing a positioning and fixing role; specifically, the boss 30 is formed by the outward expansion of the side wall of the lower end of one of the sleeves, so that the setting of the boss 30 will not affect the lifting assembly 200, the screw drive assembly 400 and the probe assembly 500. When the positioning state is released, they can smoothly enter and exit the sleeve assembly 100.

[0054] At least one pair of radial linear actuators is provided, with fixed ends of the pair of radial linear actuators being fixed to the screw drive assembly 400 and movable ends being provided with abutment blocks. When the radial linear actuators are activated to drive the movable ends radially outward, the radial distance between the movable ends of the pair of radial linear actuators is greater than the inner diameter of the boss 30, thereby axially positioning the screw drive assembly 400. When the radial linear actuators are driven to retract the movable ends radially inward, the radial distance between the movable ends of the pair of radial linear actuators is less than the inner diameter of the boss 30, thereby releasing the axial positioning state of the screw drive assembly 400. Specifically, the radial linear actuators may be electric cylinders.

[0055] Preferably, the positioning component 300 is implemented in the following manner, including:

[0056] The positioning assembly 300 includes:

[0057] The boss 30 is in the shape of a circular ring and is arranged on the sleeve assembly 100. The boss 30 is used to axially abut and limit the upward movement of the screw drive assembly 400, thereby playing a positioning and fixing role; specifically, the boss 30 is formed by the outward expansion of the lower end side wall of one of the sleeves 11, so that the setting of the boss 30 will not affect the lifting assembly 200, the screw drive assembly 400 and the probe assembly 500. When the positioning state is released, they can smoothly enter and exit the sleeve assembly 100.

[0058] A sliding sleeve 31 is fixed to the hoisting assembly 200 and is axially slidably inserted into the sleeve assembly 100. A waist-shaped groove 32 is formed on the side wall of the sliding sleeve 31.

[0059] The connecting sleeve 33 is axially slidably inserted into the sliding sleeve 31. A receiving groove 34 is provided on the outer wall of the connecting sleeve 33. A limiting screw 35 is provided on the receiving groove 34 and radially extends into the waist-shaped groove 32. The limiting screw 35 is used to limit the relative sliding distance between the connecting sleeve 33 and the sliding sleeve 31.

[0060] The positioning block 36 has a lower end radially rotatably connected to the connecting sleeve 33 and positioned within the receiving groove 34. Its upper end is secured to the sidewall of the receiving groove 34 via a spring 37. The outer wall of the positioning block 36 is designed as an inclined surface, and the radial dimension of the positioning block 36 increases from bottom to top. Specifically, the positioning block 36 is rotatably connected via a pin. The upper end of the positioning block 36 is spring-loaded by the spring 37, causing it to rotate radially outward and extend out of the kidney-shaped groove 32, thereby abutting against the lower end surface of the boss 30, achieving axial positioning, i.e., assuming a positioned state. At this time, the limit screw 35 abuts the sliding sleeve 31. When the sliding sleeve 31 slides upward onto the inclined surface of the positioning block 36, it slides on the inclined surface, compressing the positioning block 36 and the spring 37. This simultaneously compresses the positioning block 36, causing the upper end of the positioning block 36 to rotate radially inward and eventually retract into the kidney-shaped groove 32, thereby releasing the abutment against the lower end surface of the boss 30, i.e., assuming a released position.

[0061] The screw drive assembly 400 is used to drive the probe assembly 500, that is, to drive the penetration and retraction of the probe rod 50. Specifically, the screw drive assembly 400 includes:

[0062] The motor cylinder 40 is fixed to the positioning assembly 300. A motor 41 is provided in the motor cylinder 40 along the axial direction. The motor 41 drives the lead screw 42 to rotate. Specifically, the motor cylinder 40 is fixed to the connecting sleeve 33. Specifically, the radial cross section of the inner cavity of the motor cylinder 40 is a waist-shaped hole. The motor 41

[0063] The radial cross section is circumferentially in the shape of a waist-shaped hole that matches the radial cross section of the motor cylinder 40 , and the motor 41 and the motor cylinder 40 are clearance-fitted, so that the motor 41 does not rotate relative to the motor cylinder 40 , but can slide up and down in the motor cylinder 40 .

[0064] The screw cylinder 43 is connected and fixed to the lower end of the motor cylinder 40, and the upper end of the screw cylinder 43 is fixed to the nut 44 on the screw 42. A bearing assembly 45 is provided in the screw cylinder 43 along the axial sliding direction, and the lower end of the screw 42 is fixed on the bearing assembly 45; specifically, the screw cylinder 43 and the motor cylinder 40 are fixed by a connecting sleeve 46, and the connecting sleeve 46 has threads on the upper outer wall and the lower inner wall. The lower inner wall of the motor cylinder 40 and the upper outer wall of the screw cylinder 43 are provided with corresponding threads, and the upper and lower ends of the connecting sleeve 46 are threadedly fixed to the motor cylinder 40 and the screw cylinder 43 respectively. Specifically, the radial cross-section of the inner cavity of the screw cylinder 43 is a waist-shaped hole, and the radial cross-section of the bearing assembly 45 is a waist-shaped hole that matches the radial cross-section of the screw cylinder 43. The bearing assembly 45 and the inner cavity of the screw cylinder 43 are clearance-fitted, so that the bearing assembly 45 does not rotate relative to the screw cylinder 43, but can slide up and down within the screw cylinder 43. The upper end of the screw cylinder 43 is bolted to the nut 44 on the screw 42. When the motor 41 is operating, the screw 42 rotates in the nut 44 and moves downward (or upward), driving the bearing assembly 45 to move downward (or upward).

[0065] The probe assembly 500 includes a probe rod 50 and a probe head 51 fixed to the lower end of the probe rod 50. The upper end of the probe rod 50 is fixed to the bearing assembly 45. Specifically, the lower end surface of the bearing assembly 45 is provided with multiple threaded holes. The upper end surface of the probe rod 50 is provided with a radially protruding annular plate 52. The annular plate 52 is provided with multiple through holes. The through holes and the threaded holes are fixed to each other by corresponding bolts. Therefore, the downward and upward movement of the bearing assembly 45 can drive the penetration and retraction of the probe rod 50.

[0066] In the above technical solution, this device is a soil sampling device for deeper waters, and static penetration is performed using a probe rod 50 at the bottom of the casing 11. The penetration power of the probe rod 50 is provided by a motor 41, which rotates a lead screw 42, which is fixed by a nut 44 that cooperates with the lead screw 42. When the motor 41 rotates in the forward direction, the lead screw 42 and the motor 41 move downward, and the probe rod 50 connected to the lead screw 42 penetrates downward. Then, a high-precision probe 51 under the probe rod 50 penetrates the soil layer to obtain various geological data required for the surveyed soil layer. When the motor 41 rotates in the reverse direction, the lead screw 42 and the motor 41 move upward, causing the probe rod 50 to rise, thus completing the penetration of the probe rod 50.

[0067] Furthermore, the assembly 100 further includes a guide seal 55, which is axially slidably disposed within the sleeve assembly 100. The guide seal 55 comprises a guide sleeve 53, which is axially slidably disposed on the exterior of the probe rod 50 along the axially sliding sleeve 31, and a plurality of sealing rings 54 fixed to the guide sleeve 53. The sealing rings 54 are in sealed sliding connection with the sidewall of the probe rod 50. The upper end of the guide sleeve 53 is fixed to the lower end of the screw cylinder 43. Specifically, the sealing ring 54 may be a rubber ring, which provides a seal to prevent water from entering the screw cylinder 43. The probe rod 50 is inserted and retracted within the guide seal 55, preventing the probe rod 50 from being deflected by penetration resistance.

[0068] Furthermore, it also includes:

[0069] A magnetic induction sleeve 56 is provided on the sleeve assembly 100 and is located above the boss 30;

[0070] A magnetic sensing element, mounted on the sounding assembly 500, generates a magnetic sensing electrical signal when it senses the magnetic sensing sleeve 56. The function of the magnetic sensing sleeve 56 is to sense the magnetic sensing electrical signal when the sounding assembly 500 reaches a predetermined position on the seabed. This signal is then transmitted via the data line 22 to a computer on the construction vessel, indicating that preparations for penetration are complete.

[0071] Furthermore, the data cable 22 passes through the housing 20, the positioning assembly 300 (sliding sleeve 31, connecting sleeve 33) and is connected to a data cable connector 23 located in the motor cylinder 40. A section of the data cable 22 located in the motor cylinder 40 is spiral-shaped, and the data cable connector 23 is arranged on the motor 41; the data cable 22 in the motor cylinder 40 is spiral-shaped, which is convenient for the probe rod 50 to extend when penetrating, and the probe rod 50 retracts before preparing to penetrate, and the data cable 22 can retract automatically.

[0072] The motor shaft of the motor 41, the probe rod 50, the bearing assembly 45, and the lead screw 42 are all provided with axial through holes. The data cable 22 connected to the other end of the data cable connector 23 passes downward through the through hole and is connected to the probe 51, so that the various collected signals can be transmitted to the outside.

[0073] The specific operation process of this device:

[0074] S1. The casing assembly 100 is hoisted from the construction vessel to the seabed surface, and the bottom hole static penetration equipment (the bottom hole static penetration equipment includes a hoisting assembly 200, a positioning assembly 300, a screw drive assembly 400, a probing assembly 500, etc.) is hoisted from the casing 11 hole to the seabed surface position, and the probe rod 50 and the probe 51 are in contact with the seabed surface (exploration surface).

[0075] S2. Start the motor 41. Under the reaction force of the penetration of the probe rod 50 and the probe 51, the guide sealing sleeve 55, the screw cylinder 43, the motor cylinder 40, and the connecting sleeve 33 move upward, thereby causing the positioning block 36 to move upward relative to the sliding sleeve. When it moves to the end point, the upper end of the positioning block 36 is bounced open by the spring 37 so that its upper end rotates radially outward and extends out of the waist-shaped groove 32, so that it can abut against the lower end surface of the boss 30 to achieve axial positioning, that is, it is in a positioned state. At this time, the limit screw 35 abuts against the sliding sleeve 31, completing the preparation for the penetration of the probe rod 50 and the probe 51.

[0076] S3, the motor 41 continues to run. In the positioning state, the guide sealing sleeve 55, the screw cylinder 43, the motor cylinder 40, and the connecting shaft sleeve 33 are fixed, and the probe rod 50 and the probe 51 are penetrated downward until they are in place, completing the static penetration of the current soil layer.

[0077] S4. When the bottom hole static penetration equipment (the bottom hole static penetration equipment includes a lifting assembly 200, a positioning assembly 300, a screw drive assembly 400, a probe assembly 500, etc.) is lifted out of the casing assembly 100, the umbilical cable 21 pulls the outer shell 20 upward, driving the sliding sleeve 31 to move upward, and the connecting sleeve 33 is first in a stationary state because the positioning block 36 is in contact with the boss 30 and is positioned. At this time, a process of upward sliding of the sliding sleeve 31 relative to the connecting sleeve 33 is formed. During this process, the sliding sleeve 31 slides upward on the inclined plane, the positioning block 36 is compressed, and the spring 37 is compressed at the same time, causing the upper end of the positioning block 36 to rotate radially inward and finally retract into the waist-shaped groove 32, thereby releasing the contact state with the lower end face of the boss 30, that is, it is in a released positioning state. When the positioning state is released, the connecting sleeve 33 and all the components connected below the connecting sleeve 33 can be pulled out of the casing assembly 100 together, and finally lifted onto the deck of the construction ship to prepare for the next frequency penetration construction.

[0078] S5. After the casing assembly 100 is drilled into the seabed to the length of the probe rod 50, steps S1 to S4 are repeated until the exploration task of the probe rod 50 and the probe 51 of all depth soil layers is completed.

[0079] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. The bottom hole static penetration device is characterized by: include: casing assembly; A lifting assembly, which is movably sleeved in the sleeve assembly; A positioning assembly, wherein a detachable limiting sleeve is arranged in the sleeve assembly, and the positioning assembly is fixed to the lifting assembly; A screw drive assembly comprising: A motor cylinder is fixed to the positioning assembly, wherein a motor is axially slidably arranged in the motor cylinder, and the motor drives a lead screw to rotate; A screw cylinder is connected and fixed to the lower end of the motor cylinder, the upper end of the screw cylinder is fixed to the nut on the screw, a bearing assembly is provided in the screw cylinder for axial sliding, and the lower end of the screw is fixed to the bearing assembly; A feeler assembly comprising a probe rod and a probe fixed to the lower end of the probe rod, wherein the upper end of the probe rod is fixed to the bearing assembly; Wherein, the positioning component includes: a boss in a circular ring shape, the boss being arranged on the sleeve assembly; A sliding sleeve is fixed to the hoisting assembly and is axially slidably inserted into the sleeve assembly, wherein a waist-shaped groove is formed on a side wall of the sliding sleeve; A connecting sleeve is axially slidably inserted into the sliding sleeve, an accommodating groove is provided on the outer wall of the connecting sleeve, a limiting screw is provided on the accommodating groove and radially extends into the waist-shaped groove, wherein the motor cylinder is fixed to the connecting sleeve; A positioning block, the lower end of which is radially rotatably connected to the connecting sleeve and located in the receiving groove, and the upper end of which is fixed to the side wall of the receiving groove by a spring, the outer side wall of the positioning block being configured as an inclined surface, and the radial dimension of the positioning block increasing sequentially from bottom to top; When the connecting sleeve moves upward to the end point relative to the sliding sleeve, the upper end of the positioning block extends out of the waist-shaped groove and abuts against the bottom surface of the boss, the limit screw abuts against the sliding sleeve, and the positioning assembly is in a positioned state; When the sliding sleeve moves upward to the end point relative to the connecting sleeve, the lower end of the sliding sleeve presses the positioning block radially inward, and the spring is compressed until the positioning block is accommodated in the sliding sleeve, and the positioning assembly is in a released positioning state.

2. The bottom hole static penetration device according to claim 1, characterized in that: Also includes: a magnet induction sleeve, which is provided on the sleeve assembly and located above the boss; The magnetic sensing element is arranged on the sounding assembly. When the sounding assembly reaches a preset position on the seabed, the magnetic sensing element senses the magnetic induction sleeve and emits a magnetic induction electrical signal.

3. The bottom hole static penetration device according to claim 1, characterized in that: It also includes a connecting sleeve, which has threads on its upper outer wall and lower inner wall. Corresponding threads are provided on the lower inner wall of the motor cylinder and the upper outer wall of the screw cylinder. The upper and lower ends of the connecting sleeve are respectively fixed to the motor cylinder and the screw cylinder with threads.

4. The bottom hole static penetration device according to claim 3, characterized in that: The radial cross-sections of the inner cavities of the motor cylinder and the screw cylinder are both waist-shaped holes, and the radial cross-sections of the motor and the bearing assembly are circumferentially waist-shaped holes that are adapted to the radial cross-sections of the motor cylinder and the screw cylinder.

5. The bottom hole static penetration device according to claim 1, characterized in that: The lower end surface of the bearing assembly is provided with a plurality of threaded holes, the upper end surface of the probe rod is provided with an annular plate protruding radially, the annular plate is provided with a plurality of through holes, and the plurality of through holes and the plurality of threaded holes are fixed one by one by bolts.

6. The bottom hole static penetration device according to claim 1, characterized in that: It also includes a guide sealing sleeve, which is axially slidably arranged in the sleeve assembly. The guide sealing sleeve includes a guide sleeve axially slidably sleeved on the outside of the probe rod and a plurality of sealing rings fixed on the guide sleeve. The sealing rings are sealingly and slidably connected to the side wall of the probe rod. The upper end of the guide sleeve is fixed to the lower end of the screw cylinder.

7. The bottom hole static penetration device according to claim 1, characterized in that: The casing assembly comprises a plurality of casings which are detachably connected in sequence and a casing drill bit which is screwed onto the casing at the bottom.

8. The bottom hole static penetration device according to claim 7, characterized in that: The boss is formed by expanding the side wall of the lower end of one of the sleeves outwards.

9. The bottom hole static penetration device according to claim 1, characterized in that: The hoisting assembly includes a housing fixed to the positioning assembly and an umbilical cable arranged on the housing. The umbilical cable includes a steel wire rope, a data cable, and a sealing layer that seals the steel wire rope and the data cable. The data cable passes through the housing and the positioning assembly in sequence and is connected to a data cable connector located in the motor cylinder. A section of the data cable located in the motor cylinder is spiral-shaped. The motor shaft of the motor, the lead screw, the bearing assembly, and the probe rod are all provided with axial through holes, and the data cable connected to the other end of the data cable connector passes through the through hole and is connected to the probe.

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