An integrated device and method for marine cross plate testing and coring

Abstract

The present invention discloses an integrated device and method for marine cross plate test and coring, the device comprises a cross plate, a first drive device and a second drive device, the cross plate comprises a coring barrel and a plurality of cross plate blades, each cross plate blade is cross-connected together, the coring barrel is fixedly connected to each cross plate blade and is located at the cross connection of each cross plate blade, the coring barrel is a hollow structure, the central axis of the coring barrel and the cross plate coincide, the first drive device is used to connect with the upper end of the cross plate after the coring barrel completes sampling, so as to drive the cross plate to move forward in a straight line along the central axis of the cross plate, so as to push the sample out of the coring barrel, and the second drive device is used to connect with the lower end of the cross plate during sampling, so as to drive the cross plate to rotate, so as to complete the cross plate shear test. The present invention can simultaneously perform coring and cross plate shear tests, and the operation mode is efficient and economical, saving engineering costs and time.

Description

Technical Field

[0001] The invention relates to the technical field of cross plate test and sampling devices, in particular to an integrated device and method for marine cross plate test and coring. Background Art

[0002] The marine in-situ cross plate is usually used in the field test of seawater engineering. This test adopts the cross plate shear test. The equipment can be directly tested without sampling, which basically avoids the disturbance of the cross plate to the soil sample. The so-called cross plate shear test means that at the test site, the cross plate is inserted into the soil layer and a torque is applied to the cross plate, so that the cross plate is twisted at a constant speed in the soil layer until the soil layer is sheared, so as to measure the maximum torque formed on the surface of the cylinder on the cross plate during rotation, so as to calculate the undrained shear strength value of the soil layer, and obtain the real mechanical strength index.

[0003] In the process of marine engineering exploration, not only a cross-plate shear test is required, but also drilling and coring, that is, sampling is also required. Drilling and coring can obtain more realistic physical parameters. In existing devices and operation modes, drilling is usually performed first, and then a coring tool or a cross-plate is placed in the borehole to perform coring and cross-plate tests respectively, that is, in-situ tests, but they cannot be performed at the same time, which is inefficient. Therefore, it is hoped that there is a device and a corresponding method that can simultaneously obtain undisturbed soil samples and complete cross-plate shear tests. Summary of the invention

[0004] In view of the deficiencies of the prior art, an object of the present invention is to provide an integrated device for marine cross plate testing and coring, which can solve the problem of simultaneously performing sampling and cross plate shear testing.

[0005] The technical solution to achieve the purpose of the present invention is: an integrated device for marine cross plate testing and coring, comprising a cross plate, a first driving device and a second driving device,

[0006] The cross plate includes a core barrel and a plurality of cross plate blades, each cross plate blade is cross-connected together, the core barrel is fixedly connected to each cross plate blade and is located at the cross connection of each cross plate blade, the core barrel is a hollow structure, and the central axis of the core barrel and the cross plate coincide.

[0007] The first driving device is used to connect with the upper end of the cross plate after the core barrel completes sampling, so as to push the sample out of the core barrel.

[0008] The second driving device is connected to the lower end of the cross plate when sampling to drive the cross plate to rotate, thereby completing the cross plate shear test.

[0009] Furthermore, the number of the cross plate blades is four, and the four cross plate blades are cross-connected together in a standard cross shape.

[0010] Furthermore, the first driving device includes a hydraulic pump, a hydraulic joint and a piston, a piston rod is installed in the piston, the hydraulic pump is connected to the piston, the piston rod extends into the coring barrel, and the hydraulic pump is used to drive the piston rod in the piston to perform linear motion in the coring barrel.

[0011] Furthermore, the hydraulic pump is connected to the piston via a hydraulic joint, and the hydraulic joint is fixedly mounted on one end of the piston.

[0012] Furthermore, the piston rod is connected to a push rod, and the push rod is used to push the sample out of the cavity of the coring barrel.

[0013] Furthermore, a sealing ring is provided at the connection between the piston rod and the piston.

[0014] Furthermore, the second driving device includes an electronic warehouse, the electronic warehouse includes a torque sensor and a motor, the motor is used to drive the cross plate to rotate, and the torque sensor is used to measure the maximum torque on the core barrel surface of the cross plate during rotation.

[0015] Furthermore, the electronic warehouse is fixedly connected to the end of the core barrel through a joint, and a sealing ring, a one-way ball valve, a water hole and a drain hole are installed at the connection between the joint and the core barrel. The sealing ring is fixedly installed on the inner wall of the core barrel, the one-way ball valve is located between the water hole and the drain hole, and the drain holes are installed on both sides of the connection between the joint and the core barrel to discharge water entering from the water hole.

[0016] Furthermore, it also includes a communication cable connector for communication between an external working platform and the integrated device for marine cross plate testing and coring, and the communication cable connector is connected to one end of the electronic warehouse.

[0017] The present invention also provides a method for using the integrated device for marine cross plate testing and coring, comprising the following steps:

[0018] Step 1: After the cross plate blades and the core barrel are connected and installed, the upper and lower ends of the cross plate are connected to the first drive device and the second drive device respectively, and the cross plate and the first drive device and the second drive device are placed together in a predetermined position at the bottom of the well;

[0019] Step 2: The cross plate is driven forward by the first driving device. After the cross plate reaches a preset depth, the sample is squeezed into the coring barrel of the cross plate. After the sampling is completed, the cross plate is retracted to the initial position;

[0020] Step 3: The cross plate is driven to rotate by the second driving device to perform a cross plate shear strength test, and the maximum torque is measured in real time by the torque sensor on the second driving device;

[0021] Step 4: Push the cross plate out again through the first driving device to push the sample out of the coring barrel. After the sample is taken out, pull the cross plate back to its original position to reset it and prepare for the next test.

[0022] The beneficial effects of the present invention are as follows: the present invention combines the marine in-situ cross-plate test with the coring operation, and can simultaneously perform coring and cross-plate shear tests. The operation mode is efficient and economical, saving engineering costs and time. The formed integrated test device has a simple structure and is easy to use and operate. The micro-coring samples obtained are samples from the in-situ cross-plate test. Physical index test analysis is performed on the micro-coring samples, which can realize the comparison and comparison of the marine in-situ cross-plate test data and the micro-coring sample test data. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is the structural schematic diagram of the cross plate;

[0024] Figure 2 It is a structural schematic diagram of the connection between the cross plate and the second driving device;

[0025] Figure 3 It is a structural schematic diagram of the connection between the cross plate and the second driving device;.

[0026] In the figure, 1-coring barrel, 2-cross plate blades, 3-first driving device, 4-hydraulic joint, 5-piston, 6-sealing ring, 7-piston rod, 8-one-way ball valve, 9-water hole, 10-drain hole, 11-second driving device, 12-communication cable connector. Specific implementation plan

[0027] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments:

[0028] like Figure 1-Figure 3As shown, a device for integrating marine cross plate test and coring includes a cross plate, a first drive device 3 and a second drive device 11. The cross plate includes a coring barrel 1 and a plurality of cross plate blades 2, each cross plate blade 2 is cross-connected together in a cross shape, the coring barrel 1 is fixedly connected to each cross plate blade 2 and is located at the cross connection of each cross plate blade 2, and four cross plate blades 2 are usually selected, and the four cross plate blades 2 are just cross-connected together in a standard cross shape. The coring barrel 1 is a hollow structure, and the coring barrel 1 is also the shaft rod of the cross plate, and the central axis of the coring barrel 1 coincides with the cross plate. The first drive device 3 is used to connect with the upper end of the cross plate after the coring barrel 1 completes sampling, so as to push the sample out of the coring barrel 1, thereby obtaining the sample, that is, to make the sample be pushed out of the coring barrel 1. The second drive device 11 is used to connect with the lower end of the cross plate when sampling, so as to drive the cross plate to rotate, so as to complete the cross plate shear test.

[0029] The first driving device 3 includes a hydraulic pump, a hydraulic joint 4 and a piston 5. A piston rod 7 is installed in the piston 5. The hydraulic pump is connected to the piston 5 through the hydraulic joint 4. The hydraulic joint 4 is fixedly installed at one end of the piston 5. The hydraulic pump is used to drive the piston 5 to move linearly. The piston rod 7 extends into the cavity of the coring barrel 1 through the push rod. The push rod contacts the inner wall of the coring barrel. The piston rod 7 drives the push rod to move linearly in the cavity of the coring barrel 1. When the piston 5 is subjected to the force of the hydraulic pump, the piston rod 7 in the piston 5 moves linearly. The piston rod 7 pushes the sample in the coring barrel 1 out of the coring barrel 1 through the push rod, thereby obtaining the sample to complete the subsequent physical index test. Among them, the hydraulic pump is connected to the hydraulic joint 4 through an oil pipe, and oil is injected into the piston 5 through the oil pipe to increase the pressure and drive the piston rod 7 to move linearly.

[0030] Only after the coring barrel 1 completes sampling, that is, the sample has entered the coring barrel 1 and the cross plate has been recovered from the soil (for example, the cross plate has been recovered from the soil to the working platform), the first driving device 3 is connected to the upper end of the cross plate, and the first driving device 3 pushes the sample out of the coring barrel 1.

[0031] A sealing ring 6 is provided at the connection between the piston rod 7 and the piston 5, and the sealing ring 6 plays a sealing role.

[0032] The second driving device 11 includes an electronic warehouse and a communication cable connector 12. The electronic warehouse includes a torque sensor and a motor. The motor is used to drive the cross plate to rotate. The torque sensor is used to measure the maximum torque on the surface of the coring barrel 1 of the cross plate during rotation. The electronic warehouse is fixedly connected to the end of the coring barrel 1 through a connector. A sealing ring 6, a one-way ball valve 8, a water hole 9 and a drain hole 10 are installed at the connection between the connector and the coring barrel 1. The sealing ring 6 is fixedly installed on the inner wall of the coring barrel 1. A one-way ball valve 8 is installed between the water hole 9 and the drain hole 10. The one-way ball valve 8 allows water and other substances to pass only in one direction. The drain hole 10 is installed on both sides of the connection to discharge the water entering from the water hole 9. When the coring barrel 1 is coring in a seabed environment, the environment usually contains seawater, so that the seawater can be discharged from the coring barrel 1. The one-way ball valve 8 and the sealing ring 6 can effectively ensure that the sealing effect is achieved during the lifting process after each cross plate takes a sample.

[0033] When a cross-plate shear test is required, the second driving device 11 is connected to the lower end of the cross-plate, and then the cross-plate and the second driving device 11 are pushed into the soil from the upper end of the cross-plate by other power devices or manually. Then, the second driving device 11 is started, and the second driving device 11 drives the cross-plate to rotate, completing the cross-plate shear test.

[0034] The communication cable connector 12 is used for the device to communicate with the working platform, for example, to communicate with the deck of an exploration vessel.

[0035] In actual use, based on the method for using the integrated device for marine cross plate testing and coring, the following steps may be included:

[0036] Step 1: After the cross plate blades 2 and the core barrel 1 are connected and installed by screws and other connectors, the lower end of the cross plate is connected to the second drive device 11, and the cross plate and the second drive device 11 are placed together in a predetermined position at the bottom of the well.

[0037] At the same time, the cross plate is pushed forward into the soil through other power devices or manually. After the cross plate reaches the designed depth, the sample is squeezed into the coring barrel 1 of the cross plate, that is, the sample is pushed into the cavity of the coring barrel 1 to complete micro-coring.

[0038] Step 2: The cross plate is driven to rotate by the second driving device 11 to perform a cross plate shear strength test. The maximum torque is measured in real time by the torque sensor on the second driving device 11, thereby completing the cross plate shear strength test.

[0039] Step 3: Recover the cross plate and the second driving device 11 from the bottom of the well to the working platform as a whole, and remove the cross plate and the coring barrel 1 on the cross plate from the second driving device 11.

[0040] Connect the first drive device 3 to the upper end of the cross plate, and push the sample out of the coring barrel 1 of the cross plate through the first drive device 3. That is, the piston 5 and the piston rod 7 in the piston 5 are pushed out by the hydraulic pump, and then the sample is pushed out of the coring barrel 1. Take the sample out of the coring barrel 1. After the sample is taken out, the hydraulic pump pulls the piston 5 and the piston rod 7 back to their original position for reset. Then the sample is tested for physical indicators such as water content and porosity of the soil to complete the final experiment. Then you can continue to prepare for the next test.

[0041] The present invention combines the marine in-situ cross-plate test with the coring operation, and can simultaneously perform coring and cross-plate shear tests. The operation mode is efficient and economical, saving engineering costs and time. The integrated test device formed has a simple structure and is easy to use and operate. The micro-coring samples obtained are samples at the in-situ cross-plate test site. Physical index test analysis is performed on the micro-coring samples, which can realize the comparison and comparison of the marine in-situ cross-plate test data and the micro-coring sample test data.

[0042] The embodiment disclosed in this specification is only an example of a unilateral feature of the present invention, and the protection scope of the present invention is not limited to this embodiment, and any other functionally equivalent embodiments fall within the protection scope of the present invention. For those skilled in the art, various other corresponding changes and deformations can be made according to the technical solutions and concepts described above, and all of these changes and deformations should fall within the protection scope of the claims of the present invention.

Claims

1. An integrated device for marine cross plate testing and coring, characterized in that: It includes a cross plate, a first driving device and a second driving device, The cross plate includes a core barrel and a plurality of cross plate blades, each cross plate blade is cross-connected together, the core barrel is fixedly connected to each cross plate blade and is located at the cross connection of each cross plate blade, the core barrel is a hollow structure, and the central axis of the core barrel and the cross plate coincide. The first driving device is used to connect with the upper end of the cross plate after the core barrel completes sampling, so as to push the sample out of the core barrel. The second driving device is used to connect with the lower end of the cross plate when sampling to drive the cross plate to rotate, thereby completing the cross plate shear test. The second driving device includes an electronic warehouse, the electronic warehouse includes a torque sensor and a motor, the motor is used to drive the cross plate to rotate, and the torque sensor is used to measure the maximum torque on the surface of the coring barrel of the cross plate during rotation. The electronic warehouse is fixedly connected to the end of the core barrel through a joint. A sealing ring, a one-way ball valve, a water hole and a drain hole are installed at the connection between the joint and the core barrel. The sealing ring is fixedly installed on the inner wall of the core barrel, the one-way ball valve is located between the water hole and the drain hole, and the drain holes are installed on both sides of the connection between the joint and the core barrel to discharge water entering from the water hole.

2. The integrated device for marine cross plate testing and coring according to claim 1, characterized in that: The number of the cross plate blades is four, and the four cross plate blades are cross-connected together in a standard cross shape.

3. The integrated device for marine cross plate testing and coring according to claim 1, characterized in that: The first driving device includes a hydraulic pump, a hydraulic joint and a piston. A piston rod is installed in the piston. The hydraulic pump is connected to the piston. The piston rod extends into the coring barrel. The hydraulic pump is used to drive the piston rod in the piston to perform linear motion in the coring barrel.

4. The integrated device for marine cross plate testing and coring according to claim 3 is characterized in that: The hydraulic pump is connected to the piston via a hydraulic joint, and the hydraulic joint is fixedly mounted on one end of the piston.

5. The integrated device for marine cross plate testing and coring according to claim 3 is characterized in that: The piston rod is connected to a push rod, and the push rod is used to push the sample out of the cavity of the coring barrel.

6. The integrated device for marine cross plate testing and coring according to claim 3 is characterized in that: A sealing ring is arranged at the connection between the piston rod and the piston.

7. The integrated device for marine cross plate testing and coring according to claim 1, characterized in that: It also includes a communication cable connector for communication between an external working platform and the integrated device for marine cross plate testing and coring, and the communication cable connector is connected to one end of the electronic warehouse.

8. A method for using the integrated device for marine cross plate testing and coring according to claim 1, comprising the following steps: Step 1: After the cross plate blades and the core barrel are connected and installed, the lower end of the cross plate is connected to the second drive device, and the cross plate and the second drive device are placed in a predetermined position at the bottom of the well as a whole. Drive the cross plate forward into the soil. When the cross plate reaches the preset depth, the sample is squeezed into the core barrel of the cross plate, and the sampling is completed; Step 2: The cross plate is driven to rotate by the second driving device to perform a cross plate shear strength test, and the maximum torque is measured in real time by the torque sensor on the second driving device; Step 3: Recover the cross plate and the second drive unit as a whole, and remove the second drive unit from the cross plate. The first driving device is connected to the upper end of the cross plate, and the sample is pushed out from the core barrel of the cross plate through the first driving device to prepare for the next test.

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