System and method for testing bearing performance of conduit

Abstract

The invention provides a conduit bearing performance test system and method, and the system comprises an experiment cylinder which is disposed in a support frame and is filled with a soil body; the jet well drilling device is movably arranged on the supporting frame and located at the upper end of the experiment barrel, the jet well drilling device is provided with a jet drill column capable of moving in the axis direction of the experiment barrel, and an experiment guide pipe arranged outside the jet drill column in a sleeving mode can enter the soil body along with the jet drill column; the tension and pressure testing device is movably arranged on the supporting frame and located at the upper end of the experiment barrel, and the tension and pressure testing device is provided with a tension and pressure head capable of driving the experiment catheter to move up and down in the axis direction of the experiment catheter; the transverse tension testing device is connected with the support frame and the experimental conduit and can provide tension along the radial direction of the experimental conduit for the experimental conduit; and the strain sensor module is arranged on the outer side wall of the experimental catheter. The device is used for testing the bearing performance of various different conduits under different soil conditions, and is used for evaluating the stability of the conduits under complex seabed conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of marine drilling equipment, and in particular to a catheter load-bearing performance testing system and a testing method. Background Art

[0002] The extreme environmental conditions faced by deep-sea oil and gas exploration and development, such as low temperature and high pressure in deep water areas, place extremely high technical requirements on drilling equipment and related structures. In this complex context, the guide tube, as the supporting structure of the underwater wellhead and the key component of the oil and gas circulation channel, places extremely high requirements on its stability and reliability under extremely complex conditions.

[0003] Deepwater conduits face multiple challenges during stress, mainly due to the complex coupling between the conduit and the drilling platform, pipe string and other equipment. This may cause the conduit to become unstable and sink under long-term high-intensity stress, which in turn increases the risk of on-site operations, increases overall operating costs, and may even lead to the failure of the entire drilling operation. Especially in the case of soft shallow soil layers in deep water and the risk of geological disasters, it is easy to encounter problems such as long depth of surface conduits into the mud and inadequate injection.

[0004] In order to reduce the occurrence of accidents and ensure the smooth progress of deepwater drilling operations, it is urgent to design a set of devices and methods that can accurately test the load-bearing performance of the conduit. Such a device can not only help evaluate the stability of the conduit under complex seabed conditions, but also provide reliable data for formulating safer and more efficient drilling operation strategies. This testing method is crucial to the technological progress and operational safety of the deepwater oil and gas exploration and development industry. Summary of the invention

[0005] The purpose of the present invention is to provide a catheter load-bearing performance testing system and method for testing the load-bearing performance of various catheters under different soil conditions, so as to evaluate the stability of the catheter under complex seabed conditions.

[0006] In one aspect, the present invention provides a catheter load-bearing performance testing system, comprising:

[0007] An experimental cylinder is arranged in the support frame, and the experimental cylinder can be filled with soil;

[0008] A jet drilling device, which is movably arranged on the support frame and located at the upper end of the experimental tube, the jet drilling device has a jet drill string that can move along the axial direction of the experimental tube, and the experimental conduit arranged outside the jet drill string can be lowered into the soil body along with the jet drill string;

[0009] A tension and pressure test device, which is movably arranged on the support frame and located at the upper end of the test tube, and the tension and pressure test device has a tension and pressure head that can drive the test tube to move up and down along its axial direction;

[0010] A transverse tension test device, which is connected to the support frame and the experimental catheter and can provide a tensile force along the radial direction of the experimental catheter;

[0011] The strain sensor module is arranged on the outer side wall of the experimental catheter and is used to obtain the axial strain and / or bending strain of the experimental catheter.

[0012] The catheter load-bearing performance testing system described in the present invention can simulate various soil parameters in the experimental tube by configuring the soil body, and can simulate the drilling operation under the actual working conditions on site under laboratory conditions by using the jet drilling device. The vertical and lateral load-bearing performance of the experimental catheter can be accurately tested by using the tension and pressure testing device and the lateral tension testing device.

[0013] The catheter load-bearing performance testing system described in the present invention has various test components that are modularly configured to facilitate disassembly and installation, while simplifying the operating steps in a specific experimental process; components such as the experimental catheter and the jet drill string can be flexibly changed in size according to actual requirements, and the experimental catheter can also be equipped with various sensors and components according to test requirements to meet various test needs.

[0014] The catheter load-bearing performance testing system described in the present invention can test and analyze different types of catheters of the same size and / or catheters of the same type but of different sizes, obtain the influence of various catheter parameters on the load-bearing performance, reveal the influencing factors of the load-bearing characteristics, and provide technical support and guidance for actual operations.

[0015] In a preferred embodiment of the present invention, a first transverse track is provided on the top of the support frame, a beam frame is slidably connected to the first transverse track, the beam frame is provided with a longitudinal track perpendicular to the first transverse track, and the jet drilling device and the tensile and compressive testing device are both slidably connected to the longitudinal track.

[0016] In this embodiment, the first transverse track can facilitate the adjustment of the transverse position of the jet drilling device, the tensile and pressure testing device and the transverse tensile testing device, while the longitudinal track can facilitate the adjustment of the longitudinal position of the jet drilling device and the tensile and pressure testing device; the setting of the top track of the support frame can not only realize the drilling operation at different positions in the test tube, but also facilitate the switching of the corresponding devices during the drilling and testing process.

[0017] In a preferred embodiment of the present invention, the tensile and compressive testing device has a tensile and compressive testing machine, which is slidably connected to the longitudinal track through a tensile and compressive mounting plate at the bottom thereof, and the tensile and compressive head on the tensile and compressive testing machine faces the top end of the experimental tube and has a ballast head and a pulling head, the ballast head can be pressed on the top end of the experimental tube and move toward the experimental tube, and the pulling head can be connected to the experimental tube and move away from the experimental tube.

[0018] In this embodiment, the tensile and pressure testing machine performs pressure testing and pull-out testing on the experimental catheter, on which various types of sensors such as displacement sensors and force sensors are arranged. During the specific testing process, the tensile and pressure testing machine can record the corresponding relationship between various relative parameters of the experimental catheter under different states, and then derive the compressive performance of the experimental catheter based on the data analysis recorded on the tensile and pressure testing machine.

[0019] In a preferred embodiment of the present invention, the lateral tension testing device includes a pull cable, and a first pipe clamp and a first fixed pulley opposite to each other in the radial direction of the test cylinder are respectively provided on the outer wall of the test tube and the inner wall of the test cylinder, one end of the pull cable is connected to the first pipe clamp, and the other end of the pull cable passes around the first fixed pulley in the radial direction of the test cylinder, then extends out of the test cylinder and is connected to a counterweight block.

[0020] In this embodiment, the counterweight block connected to the cable provides a tensile force in the lateral direction to the experimental catheter. During the specific test process, the displacement of the experimental catheter under the action of counterweight blocks of different weights (displacement of the counterweight block) is recorded to obtain the horizontal tensile performance of the experimental catheter.

[0021] In a preferred embodiment of the present invention, an adjustment track extending along the axial direction of the test cylinder is provided on the inner side wall, the first fixed pulley is slidably arranged on the adjustment track, and the installation position of the first pipe clamp can be adjusted with the position of the first fixed pulley.

[0022] In this embodiment, since the depth of the experimental conduit during the experiment may vary, the connection position of the lateral tension test device also needs to be adjusted accordingly, and the position of the first fixed pulley is adjusted by adjusting the track to ensure that the cable can always apply horizontal tension to the experimental conduit. On the other hand, the positions of the first pipe clamp and the first fixed pulley can also be adjusted at the same time, thereby simulating the stress conditions of the experimental conduit at different positions.

[0023] In a preferred embodiment of the present invention, a second fixed pulley and a third fixed pulley are provided on the support frame, and the other end of the cable passes through the first fixed pulley, the second fixed pulley and the third fixed pulley in sequence and then extends vertically downward and is connected to the counterweight block.

[0024] In this embodiment, one end of the cable connected to the counterweight is led out to the outside of the test tube and the support frame by the second fixed pulley and the third fixed pulley arranged on the support frame, thereby facilitating the measurement of the position of the counterweight during the test.

[0025] In a preferred embodiment of the present invention, the strain sensor module includes at least one first strain gauge group and / or at least one second strain gauge group;

[0026] The first strain gauge group includes four first strain gauges attached to opposite positions of the side wall of the experimental catheter, and two first strain gauges located on the same side of the experimental catheter are perpendicular to each other;

[0027] The second strain gauge group includes four second strain gauges attached to opposite positions of the side wall of the experimental catheter, and two second strain gauges located on the same side of the experimental catheter are parallel to each other.

[0028] In this embodiment, the strain sensor module can measure the strain of the experimental catheter during the experiment, and then obtain the anti-strain performance of the experimental catheter in different states; wherein the first strain gauge group can obtain the axial strain of the experimental catheter, and the second strain gauge group can obtain the bending strain of the experimental catheter.

[0029] In a preferred embodiment of the present invention, the jet drilling device has a jet mounting plate slidably arranged on the longitudinal track and a jet bracket arranged on the jet mounting plate, the jet bracket is provided with a jet track extending along the axial direction of the experimental catheter, a nut seat is slidably connected to the jet track, and the jet drill string is connected to the nut seat.

[0030] In this embodiment, the main structure of the jet drilling device is connected to the support frame. During the simulated drilling process, the jet drill string can move downward along the jet track and can rise along the jet track after the drilling operation is completed. The jet drilling device is a simulated drilling platform, which can better simulate and reproduce the process of lowering the casing along the drill pipe.

[0031] In a preferred embodiment of the present invention, the injection bracket is also provided with an injection screw parallel to the injection track, the injection screw is threadedly connected to the nut seat, and one end of the injection screw is drivingly connected to the injection track motor.

[0032] In this embodiment, the jet track motor and the jet screw provide power for lowering and recovering the jet drill string. The jet track motor drives the jet screw to rotate, and then drives the nut seat to drive the jet drill string to descend or ascend.

[0033] In a preferred embodiment of the present invention, the jet drill string has a simulated drill rod and a simulated drill bit connected to one end of the simulated drill rod, a rotary joint mounting plate is provided on the nut seat, a rotary joint and a drill rod motor are provided on the rotary joint mounting plate, and the other end of the simulated drill rod can rotatably pass through the rotary joint and is connected to the drill rod motor drive.

[0034] In this embodiment, the drill rod motor provides power for the rotation of the jet drill string, and the rotation of the drill rod motor drives the simulated drill rod and the simulated drill bit to rotate together.

[0035] In a preferred embodiment of the present invention, a water injection channel connected to the simulated drill bit is provided in the simulated drill rod, an opening connected to the water injection channel is provided on the rotary joint, and the opening is connected to a water injection pipe.

[0036] In this embodiment, the water injection pipe is connected to the water pump, and then high-pressure water is introduced into the simulated drill rod and the simulated drill bit. The high-pressure water is ejected through the simulated drill bit, thereby simulating the operation process of jet drilling.

[0037] In a preferred embodiment of the present invention, the first transverse rail includes a transverse rail body and a transverse rail lead screw arranged parallel to the transverse rail body, a transverse rail slider is threadedly connected to the transverse rail lead screw, the beam frame is mounted on the transverse rail slider, and one end of the transverse rail lead screw is drivingly connected to a transverse rail motor.

[0038] In this embodiment, the cross-rail motor provides power for the lateral movement of the beam frame, and the cross-rail motor drives the cross-rail lead screw to rotate together, thereby driving the cross-rail slider to drive the beam frame to slide laterally on the cross-rail body.

[0039] In a preferred embodiment of the present invention, the longitudinal rail includes a longitudinal rail body and a longitudinal rail screw arranged parallel to the longitudinal rail body, a top block is threadedly connected to the longitudinal rail screw, the top block is connected to the tensile and compressive testing device, and one end of the longitudinal rail screw is connected to a shaking handle.

[0040] In this embodiment, the power for the longitudinal movement of the tension and pressure test device is provided by manually rotating the shaking handle, and the shaking handle drives the horizontal rail lead screw to rotate, thereby driving the top block to drive the tension and pressure test device to slide longitudinally on the longitudinal rail body.

[0041] In a preferred embodiment of the present invention, a tube straightening device is provided on the upper part of the experimental cylinder, and the tube straightening device includes a positioning bar provided on the top of the experimental cylinder and a second tube clamp connected to the positioning bar, and the experimental catheter passes through the second tube clamp.

[0042] In this embodiment, due to the limiting effect of the second pipe clamp in the pipe body straightening device, the experimental pipe can be prevented from being significantly tilted during the lowering process of the experimental pipe passing through the second pipe clamp.

[0043] In a preferred embodiment of the present invention, a second transverse track is provided at the bottom of the support frame, and the experimental cylinder is slidably disposed on the second transverse track via rollers at the bottom thereof.

[0044] In this embodiment, the experimental cylinder can be easily moved out of the support frame through the second transverse track, thereby facilitating the replacement of the soil in the experimental cylinder during the experiment, and also facilitating the inspection of the soil and the cleaning of the experimental cylinder.

[0045] In a preferred embodiment of the present invention, a water outlet is provided on the side wall of the bottom of the experimental cylinder.

[0046] In this embodiment, the liquid in the experimental cylinder can be discharged through the drain port to control the experimental conditions during the experiment. It is also convenient to empty the experimental soil in the experimental cylinder after the experiment to avoid a large amount of soil adhering to the inner wall of the experimental cylinder.

[0047] On the other hand, the present invention further provides a method for testing the load-bearing performance of a catheter, the method being implemented by using the catheter load-bearing performance testing system as described above, and comprising:

[0048] Step S1: installing and inspecting the catheter load-bearing performance test system;

[0049] Step S2: placing the test soil in layers in the test cylinder;

[0050] Step S3: arranging the strain sensor module on the experimental catheter and connecting it to a data acquisition instrument;

[0051] Step S4: moving the jet drilling device to a first drilling position, fixing the test pipe on the jet drill string and lowering the test pipe along with the jet drill string to a set depth in the test soil body;

[0052] Step S5: After the soil is left to stand for a target time to recover its strength, the connection between the test pipe and the jet drill string is disconnected, the jet drill string is lifted and the jet drilling device is removed, and the tension and pressure test device is moved above the test pipe;

[0053] Step S6: applying downward pressure to the experimental conduit step by step through the tension and pressure head, recording the load-settlement curve and / or axial strain of the experimental conduit, and stopping the experiment when a steep slope appears in the load-settlement curve.

[0054] The catheter load-bearing performance testing method described in the present invention can test the compressive load resistance of the experimental catheter. The load-settlement curve of the experimental catheter is obtained through a tensile pressure testing device, and the maximum compressive load of the experimental catheter is obtained according to the mutation point of the curve; the axial strain curve of the experimental catheter is obtained through a strain sensor module, and the axial deformation resistance of the experimental catheter is obtained according to the analysis of the curve.

[0055] In a preferred embodiment of the present invention, after completing the above-mentioned ballast test, the catheter load-bearing performance test method further includes:

[0056] Step S7: lowering the test pipe to a set depth of a second drilling position by using the jet drilling device;

[0057] Step S8: After the soil is left to stand for a target time to recover its strength, the connection between the test pipe and the jet drill string is disconnected, the jet drill string is lifted and the jet drilling device is removed, and the tension and pressure test device is moved above the test pipe;

[0058] Step S9: applying tension to the experimental catheter through the tension and pressure head, recording the time-load curve of the experimental catheter, and stopping the experiment when the load begins to decrease.

[0059] In this embodiment, the method can test the axial tensile resistance of the experimental catheter, obtain the time-settlement curve of the experimental catheter through the tension and pressure testing device, and obtain the maximum tensile load of the experimental catheter according to the peak point of the curve.

[0060] In a preferred embodiment of the present invention, after completing the above-mentioned ballasting test or pulling test, it also includes:

[0061] Step S10: lowering the test pipe to a set depth of a third drilling position by using the jet drilling device;

[0062] Step S11: After the soil is left to stand for a target time and recovers its strength, the connection between the test pipe and the jet drill string is disconnected, the jet drill string is lifted and the jet drilling device is removed;

[0063] Step S12: connecting the lateral tension test device to apply horizontal tension to the experimental catheter step by step, and recording the load-displacement curve and / or bending strain of the experimental catheter.

[0064] In this embodiment, the method can test the transverse (horizontal) tensile performance of the experimental catheter, obtain the load-displacement curve of the experimental catheter through a transverse tensile test device, and obtain the maximum tensile load of the experimental catheter based on the mutation point of the curve; obtain the bending strain curve of the experimental catheter through a strain sensor module, and obtain the bending deformation resistance of the experimental catheter based on analysis of the curve. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0066] The accompanying drawings described herein are only for explanation purposes and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the various components in the figures are only schematic, used to help understand the present invention, and are not specifically limited to the shapes and proportional dimensions of the various components of the present invention. Those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to the teachings of the present invention.

[0067] Figure 1 It is a schematic diagram of the overall structure of the catheter load-bearing performance testing system of the present invention;

[0068] Figure 2 It is a structural schematic diagram of the support frame of the present invention;

[0069] Figure 3 It is a schematic diagram of the structure of the tension and pressure test device of the present invention arranged on a longitudinal track;

[0070] Figure 4 It is a structural schematic diagram of the tension and pressure testing device of the present invention;

[0071] Figure 5 It is a structural schematic diagram of the lateral tension testing device of the present invention;

[0072] Figure 6 is a schematic diagram of the distribution structure of the first strain gauge group of the present invention;

[0073] Figure 7 is a schematic diagram of the distribution structure of the second strain gauge group of the present invention;

[0074] Figure 8 It is a structural schematic diagram of the jet drilling device of the present invention;

[0075] Fig. 9 It is a structural schematic diagram of the experimental tube of the present invention;

[0076] Fig.10 It is a structural schematic diagram of the pipe body straightening device of the present invention.

[0077] Description of reference numerals:

[0078] 10. Experimental cylinder; 11. Bottom plate; 12. Drain port; 13. Adjustment track; 15. Roller;

[0079] 20. Support frame; 21. First transverse rail; 211. Transverse rail body; 212. Transverse rail lead screw; 213. Transverse rail slider; 214. Transverse rail motor; 22. Longitudinal rail; 221. Longitudinal rail body; 222. Longitudinal rail lead screw; 223. Top block; 224. Shaking handle; 23. Beam frame; 231. Longitudinal beam; 232. Transverse beam; 24. Second transverse rail;

[0080] 30. Jet drilling device; 31. Jet bracket; 311. Bracket body; 312. Jet mounting plate; 313. Jet track; 314. Nut seat; 315. Jet screw; 316. Jet track motor; 32. Jet drill string; 321. Simulated drill rod; 322. Simulated drill bit; 33. Rotary joint mounting plate; 34. Rotary joint; 35. Drill rod motor;

[0081] 40. Tensile and pressure testing device; 41. Tensile and pressure testing machine; 42. Tensile and pressure head; 43. Tensile and pressure mounting plate;

[0082] 50. Transverse tension test device; 51. Cable; 52. First fixed pulley; 53. Counterweight; 54. Second fixed pulley; 55. Third fixed pulley

[0083] 60. Experimental catheter; 61. First tube clamp;

[0084] 70. strain sensor module; 71. first strain gauge; 72. second strain gauge;

[0085] 80. Pipe body straightening device; 81. Positioning strip; 82. Second pipe clamp. DETAILED DESCRIPTION

[0086] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0087] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0088] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0089] Implementation method 1:

[0090] like Figures 1 to 10 As shown, the present invention provides a catheter load-bearing performance testing system, which includes:

[0091] The test tube 10 is arranged in the support frame 20, and the test tube 10 can be filled with soil;

[0092] The jet drilling device 30 is movably mounted on the support frame 20 and is located at the upper end of the test tube 10. The jet drilling device 30 has a jet drill string 32 that can move along the axis of the test tube 10. The test guide tube 60 disposed outside the jet drill string 32 can be lowered into the soil along with the jet drill string 32.

[0093] A tension and pressure test device 40 is movably disposed on the support frame 20 and located at the upper end of the test tube 10. The tension and pressure test device 40 has a tension and pressure head 42 that can drive the test tube 60 to move up and down along its axial direction;

[0094] A transverse tensile test device 50, which connects the support frame 20 and the test catheter 60 and can provide a tensile force along the radial direction of the test catheter 60;

[0095] The strain sensor module 70 is disposed on the outer side wall of the experimental catheter 60 and is used to obtain the axial strain and / or bending strain of the experimental catheter 60 .

[0096] The catheter bearing performance testing system described in the present invention can simulate various soil parameters in the experimental tube 10 by configuring the soil, and can simulate the drilling operation under actual field conditions under laboratory conditions through the jet drilling device 30. The vertical and lateral bearing performance of the experimental catheter 60 can be accurately tested by using the tension and pressure testing device 40 and the lateral tension testing device 50.

[0097] The catheter load-bearing performance testing system described in the present invention has various test components that are modularly configured to facilitate disassembly and installation, while simplifying the operating steps in a specific experimental process; the experimental catheter 60 and the jet drill string 32 and other components can be flexibly changed in size according to actual requirements, and the experimental catheter 60 can also be equipped with various sensors and components according to test requirements to meet various test needs.

[0098] The catheter load-bearing performance testing system described in the present invention can test and analyze different types of catheters of the same size and / or catheters of the same type but of different sizes, obtain the influence of various catheter parameters on the load-bearing performance, reveal the influencing factors of the load-bearing characteristics, and provide technical support and guidance for actual operations.

[0099] The specific structure, connection relationship, working principle and technical effect of each component in the catheter load-bearing performance testing system described in the present invention will be further explained below.

[0100] First, if Figure 1 and Fig. 9 As shown, the experimental cylinder 10 is a cylindrical structure with an open top, and the interior thereof is used to load the experimental soil configured according to the experimental requirements, and water, salt water or other solutions can be added according to the requirements to simulate different experimental environments. In this embodiment, the experimental cylinder 10 includes a cylinder wall and a bottom plate 11 welded to the bottom of the cylinder wall, the bottom plate 11 seals the bottom of the cylinder wall, and an opening is formed at the top of the cylinder wall, through which the experimental soil and solution are added into the experimental cylinder 10.

[0101] like Figure 1 and Figure 2 As shown, the support frame 20 is the main frame structure of the catheter load-bearing performance test system, and various devices required during the experiment are fixed on the support frame 20. In this embodiment, the support frame 20 includes two side frames arranged opposite to each other, and a rear frame connected between the two side wall frames. An accommodating space is formed between the two side frames and the rear frame, and the experimental tube 10 is placed in the accommodating space. The rear frame is connected to a bottom frame, and the experimental tube 10 is placed on the bottom frame; a top frame is connected between the tops of the two side frames, and a jet drilling device 30 and a tension and pressure test device 40 are installed on the top frame.

[0102] In this embodiment, the support frame 20 can be welded from strip steel, and the specific welding structure on each side wall of the support frame 20 can be determined according to actual needs, as long as the stability of the support frame 20 structure can be guaranteed, and no specific limitation is made here.

[0103] like Figure 1 and Figure 8As shown, the jet drilling device 30 can simulate the drilling process in the soil of the test tube 10, and then lower the test conduit 60 into the test soil, which is equivalent to a reduced and simplified drilling platform. The jet drilling device 30 can be movably arranged on the top frame of the support frame 20, and can be slidably connected by a track slider, or rolled connected by a track roller 15. When it is necessary to lower the test conduit 60 into the soil, the test conduit 60 is sleeved on the jet drill string 32 and the jet drilling device 30 is moved to the top of the drilling position, the test conduit 60 is connected to the jet drill string 32, and the jet drill string 32 is started to drive the test conduit 60 to drill; after the test conduit 60 is lowered into the test soil, the jet drilling device 30 is removed, and various bearing properties of the test conduit 60 are tested by various test devices.

[0104] like Figure 1 , Figure 3 and Figure 4 As shown, the tension and pressure test device 40 is used to test the bearing performance of the test conduit 60 in the axial direction lowered into the test soil. It is movably arranged on the top frame of the support frame 20, and can be slidably connected by a track slider or rolled by a track roller 15. After the test conduit 60 is lowered into the test soil and the jet drilling device 30 is removed, the tension and pressure test device 40 is moved to the top of the test conduit 60, and the tension and pressure head 42 on the tension and pressure test device 40 can move toward the test conduit 60 to perform a ballasting test on the test conduit 60, or the tension and pressure head 42 can be connected to the test conduit 60 and move away from the test conduit 60 to perform a pulling test on the test conduit 60.

[0105] like Figure 1 and Figure 5 As shown, the lateral tension test device 50 is used to test the radial bearing performance of the test conduit 60 lowered into the test soil. The lateral tension test device 50 connects the support frame 20 and the test conduit 60. The lateral tension test device 50 can provide the test conduit 60 with tension along its radial direction through the auxiliary effect of the support frame 20. After the test conduit 60 is lowered into the test soil and the jet drilling device 30 is removed, the lateral tension test device 50 is turned on to perform a lateral tensile test on the test conduit 60.

[0106] like Figure 5As shown, a strain sensor module 70 is provided on the outer wall of the experimental conduit 60, which can monitor the axial strain and / or bending strain of the experimental conduit 60 during the load-bearing performance test. The strain sensor module 70 can be a strain gauge. Before the experimental conduit 60 is lowered into the experimental soil, the strain sensor module 70 is attached to the outer wall of the experimental conduit 60 and electrically connected to the data acquisition instrument. Then, the experimental conduit 60 with the strain sensor module 70 is lowered into the experimental soil along the jet drill string 32; in the subsequent process of carrying out the load-bearing performance test of the experimental conduit 60 through the tension and pressure test device 40 and the lateral tension test device 50, the deformation of the experimental conduit 60 is obtained in real time through the data acquisition instrument.

[0107] The structure and technical effects of the preferred embodiment of the catheter load-bearing performance testing system of the present invention will be further described below.

[0108] According to one embodiment of the present invention, Figures 1 to 3 As shown, a first transverse track 21 is provided on the top of the support frame 20, and a beam frame 23 is slidably connected to the first transverse track 21. The beam frame 23 is provided with a longitudinal track 22 perpendicular to the first transverse track 21, and the jet drilling device 30 and the tension and pressure testing device 40 are both slidably connected to the longitudinal track 22.

[0109] The first transverse track 21 can facilitate the adjustment of the transverse position of the jet drilling device 30, the tension and pressure testing device 40 and the transverse tension testing device 50, and the longitudinal track 22 can facilitate the adjustment of the longitudinal position of the jet drilling device 30 and the tension and pressure testing device 40; the setting of the top track on the support frame 20 can not only realize the drilling operation at different positions in the test tube 10, but also facilitate the sliding switching of the corresponding devices during the drilling and testing process.

[0110] Specifically, Figure 2 As shown, the first transverse track 21 is arranged on the top of the two side frames of the support frame 20, and the beam frame 23 described in this embodiment is the top frame described above; in this embodiment, the beam frame 23 includes two parallel longitudinal beams 231 and a plurality of transverse beams 232 connected between the two longitudinal beams 231, and the two ends of the longitudinal beams 231 are respectively slidably connected to the first transverse track 21 on the top of the two side frames. The longitudinal track 22 is arranged on the two longitudinal beams 231 of the beam frame 23, and the jet drilling device 30 and the tension and pressure testing device 40 are both slidably connected to the longitudinal track 22.

[0111] In a preferred embodiment, if Figure 2 and Figure 3As shown, the first transverse rail 21 includes a transverse rail body 211 and a transverse rail lead screw 212 arranged parallel to the transverse rail body 211, a transverse rail slider 213 is threadedly connected to the transverse rail lead screw 212, the beam 23 is mounted on the transverse rail slider 213, and one end of the transverse rail lead screw 212 is drivingly connected to a transverse rail motor 214.

[0112] The cross-rail motor 214 provides power for the lateral movement of the beam frame 23 . The cross-rail motor 214 drives the cross-rail lead screw 212 to rotate together, thereby driving the cross-rail slider 213 to drive the beam frame 23 to slide horizontally on the cross-rail body 211 .

[0113] Specifically, taking the first transverse rail 21 arranged on the top of a side frame on the support frame 20 as an example, the transverse rail body 211 has two slide rails arranged on the top plane of the side frame, the two slide rails are parallel to each other, and a transverse rail slider 213 is arranged above the slide rails, and the transverse rail slider 213 is clamped on the two slide rails and can slide along the extension direction of the slide rails. A transverse rail lead screw 212 parallel to the extension direction of the slide rail is arranged between the two slide rails, and the two ends of the transverse rail lead screw 212 are axially rotatably connected to the plane at the top of the side frame through bearings. The transverse rail slider 213 is provided with a thread that can mesh with the transverse rail lead screw 212, the transverse rail lead screw 212 passes through the transverse rail slider 213 and one end of it is connected to a transverse rail motor 214, the transverse rail motor 214 is fixed on the support frame 20, and the output shaft of the transverse rail motor 214 is drivingly connected to one end of the transverse rail lead screw 212, and the two are connected together through a coupling. The cross-rail motor 214 drives the cross-rail lead screw 212 to rotate together, thereby driving the cross-rail slider 213 to move along the cross-rail lead screw 212, that is, the cross-rail slider 213 slides on the slide rail, thereby driving the beam frame 23 thereon to move together.

[0114] In a preferred embodiment, if Figure 3 As shown, the longitudinal rail 22 includes a longitudinal rail body 221 and a longitudinal rail lead screw 222 arranged parallel to the longitudinal rail body 221, a top block 223 is threadedly connected to the longitudinal rail lead screw 222, the top block 223 is connected to the tension and pressure testing device 40, and one end of the longitudinal rail lead screw 222 is connected to a shaking handle 224.

[0115] The shaking handle 224 is manually rotated to provide power for the longitudinal movement of the tension and pressure test device 40 . The shaking handle 224 drives the cross rail lead screw 212 to rotate, thereby driving the top block 223 to drive the tension and pressure test device 40 to slide longitudinally on the longitudinal rail body 221 .

[0116] Specifically, the longitudinal rail body 221 includes two slide rails respectively arranged on the top surfaces of the two longitudinal beams 231, the two slide rails are parallel to each other, and the tension and pressure test device 40 is clamped on the two slide rails and can slide along the extension direction of the slide rails. A longitudinal rail lead screw 222 parallel to the slide rail is provided on the side of one of the longitudinal beams 231, and the two ends of the longitudinal rail lead screw 222 are axially rotatably fixed on the longitudinal beam 231 through bearings. A top block 223 is threadedly connected to the longitudinal rail lead screw 222, and rotating the longitudinal rail lead screw 222 can drive the top block 223 to move along the longitudinal rail lead screw 222. The top block 223 is connected to the tension and pressure test device 40, and one end of the longitudinal rail lead screw 222 is connected to a shaking handle 224; the experimenter manually rotates the shaking handle 224 to drive the longitudinal rail lead screw 222 to rotate, thereby driving the top block 223 and the tension and pressure test device 40 to move together, that is, the tension and pressure test device 40 slides along the slide rail on the longitudinal beam 231.

[0117] According to one embodiment of the present invention, Figure 3 and Figure 4 As shown, the tension and pressure testing device 40 has a tension and pressure testing machine 41, which is slidably connected to the longitudinal rail 22 through a tension and pressure mounting plate 43 at the bottom thereof. The tension and pressure head 42 on the tension and pressure testing machine 41 faces the top end of the experimental catheter 60 and has a ballast head and a pulling head. The ballast head can be pressed on the top end of the experimental catheter 60 and move toward the experimental catheter 60, and the pulling head can be connected to the experimental catheter 60 and move away from the experimental catheter 60.

[0118] The tensile and pressure testing machine 41 performs a pressure test and a tensile test on the experimental catheter 60. It is provided with various types of sensors such as displacement sensors and force sensors. During the specific test process, the tensile and pressure testing machine 41 can record the corresponding relationship between various parameters of the experimental catheter 60 under different states, and then analyze the data recorded on the tensile and pressure testing machine to obtain the compressive and tensile properties of the experimental catheter 60.

[0119] Specifically, the tension and compression mounting plate 43 is a rectangular plate, and a slider is connected to each of the two ends of the lower side of the tension and compression mounting plate 43, and the two sliders can be respectively clamped on the two slide rails on the beam frame 23. The tension and compression head 42 on the tension and compression testing machine 41 includes a round pancake-shaped ballast head with a diameter slightly larger than the diameter of the experimental catheter 60, which can evenly apply the pressure of the tension and compression testing machine 41 to the top surface of the experimental catheter 60; the tension and compression head 42 also includes a pulling head with a hook, and a wire passing hole is drilled on the upper part of the experimental catheter 60, which can be connected to the steel wire. The pulling head applies the tension of the tension and compression testing machine 41 to the experimental catheter 60 by hooking the steel wire.

[0120] According to one embodiment of the present invention, Figure 5As shown, the transverse tension test device 50 includes a cable 51, a first pipe clamp 61 is provided on the outer side wall of the test tube 60, and a first fixed pulley 52 is provided on the inner side wall of the test tube 10. The first pipe clamp 61 and the first fixed pulley 52 are arranged opposite to each other in the radial direction of the test tube 10. One end of the cable 51 is connected to the first pipe clamp 61, and the other end of the cable 51 passes through the first fixed pulley 52 in the radial direction of the test tube 10, then extends out of the test tube 10 and is connected to a counterweight 53.

[0121] The counterweight block 53 connected to the cable 51 provides a tensile force in the transverse direction to the experimental catheter 60. During the specific test process, the displacement of the experimental catheter 60 (the displacement of the counterweight block 53) under the action of the counterweight blocks 53 of different weights is recorded, and the transverse tensile resistance of the experimental catheter 60 is then obtained.

[0122] Specifically, the first pipe clamp 61 includes two semicircular parts butted together, which are sleeved on the outer wall of the upper part of the experimental conduit 60 and fastened by bolts; a first fixed pulley 52 corresponding to the first pipe clamp 61 is provided on the inner wall of the experimental cylinder 10, and the first fixed pulley 52 and the first pipe clamp 61 are located on the same horizontal plane; the installation position of the first fixed pulley 52 is relatively high, and the height of the experimental soil filled in the experimental cylinder 10 is lower than the installation height of the first fixed pulley 52.

[0123] In the specific experimental process, the first pipe clamp 61 and the first fixed pulley 52 are installed at the corresponding positions after the experimental conduit 60 is lowered into the soil; since the installation position of the first fixed pulley 52 is fixed, the first fixed pulley 52 is first installed on the inner wall of the experimental tube 10, and then the first pipe clamp 61 is sleeved at the corresponding position on the experimental conduit 60 so that it is located on the same horizontal plane as the first fixed pulley 52.

[0124] In a preferred embodiment, if Figure 5 and Fig. 9 As shown, an adjustment track 13 extending along the axial direction of the test cylinder 10 is provided on the inner side wall thereof, and the first fixed pulley 52 is slidably arranged on the adjustment track 13 , and the installation position of the first pipe clamp 61 can be adjusted with the position of the first fixed pulley 52 .

[0125] Since the depth of the experimental conduit 60 inserted into the soil during the experiment may vary, the connection position of the transverse tension test device 50 also needs to be adjusted accordingly, and the position of the first fixed pulley 52 is adjusted by adjusting the track 13 to ensure that the cable 51 can always apply horizontal tension to the experimental conduit 60. On the other hand, the positions of the first pipe clamp 61 and the first fixed pulley 52 can also be adjusted at the same time, thereby simulating the transverse tension of the experimental conduit 60 at different positions.

[0126] According to one embodiment of the present invention, Figure 5As shown, a second fixed pulley 54 and a third fixed pulley 55 are provided on the support frame 20, and the other end of the cable 51 passes through the first fixed pulley 52, the second fixed pulley 54, and the third fixed pulley 55 in sequence, and then extends vertically downward and connects to the above-mentioned counterweight block 53.

[0127] In this embodiment, the second fixed pulley 54 and the third fixed pulley 55 provided on the support frame 20 are used to lead one end of the cable 51 connected to the counterweight 53 to the outside of the test tube 10 and the support frame 20, thereby facilitating the measurement of the position of the counterweight 53 during the test.

[0128] Specifically, the second fixed pulley 54 is fixed on one of the cross beams 232 of the beam frame 23, and the third fixed pulley 55 is fixed on the cross rail slider 213 at one end of the beam frame 23. One end of the cable 51 is connected to the first pipe clamp 61, and the other end thereof extends horizontally to the first fixed pulley 52, bypasses the first fixed pulley 52 and then extends obliquely upward to the second fixed pulley 54, bypasses the second fixed pulley 54 and then extends horizontally to the third fixed pulley 55, bypasses the third fixed pulley 55 and then extends vertically downward and is connected to a counterweight 53.

[0129] According to one embodiment of the present invention, Figure 6 and Figure 7 As shown, the strain sensor module 70 includes at least one first strain gauge group and / or at least one second strain gauge group; the first strain gauge group includes four first strain gauges 71 attached to relative positions of the side walls of the experimental catheter 60, and the two first strain gauges 71 located on the same side of the experimental catheter 60 are perpendicular to each other; the second strain gauge group includes four second strain gauges 72 attached to relative positions of the side walls of the experimental catheter 60, and the two second strain gauges 72 located on the same side of the experimental catheter 60 are parallel to each other.

[0130] The strain sensor module 70 can measure the strain of the experimental catheter 60 during the experiment, and then obtain the strain resistance performance of the experimental catheter 60 in different states; wherein the first strain gauge group can obtain the axial strain of the experimental catheter 60, and the second strain gauge group can obtain the bending strain of the experimental catheter 60.

[0131] Specifically, Figure 6 As shown, along the length direction of the experimental catheter 60, a plurality of first strain gauge groups are arranged at intervals on its outer surface; taking one of the first strain gauge groups as an example for explanation, the first strain gauge group includes four first strain gauges 71 connected in a full bridge, wherein two of them form a pair, and the two pairs are respectively arranged on opposite sides of the radial direction of the experimental catheter 60, and the two first strain gauges 71 located on the same side are perpendicular to each other, one of which is attached along the axial direction of the experimental catheter 60, and the other is attached along the circumferential direction of the experimental catheter 60.

[0132] like Figure 7As shown, along the length direction of the catheter, a plurality of second strain gauge groups are arranged at intervals on its outer side surface; taking one of the second strain gauge groups as an example for explanation, the second strain gauge group includes four second strain gauges 72 connected in a full bridge, two of which form a pair, and the two pairs are respectively arranged on opposite sides of the radial direction of the experimental catheter 60, wherein the two second strain gauges 72 located on the same side are adjacent and parallel to each other, and are both arranged along the axial direction of the experimental catheter 60.

[0133] In this embodiment, before the experimental catheter 60 is lowered into the soil, the first strain gauge group and the second strain gauge group are attached to the outer wall of the experimental catheter 60 and electrically connected to the data acquisition instrument, and then the experimental catheter 60 with the strain gauges is lowered into the experimental soil; in the subsequent process of carrying performance testing of the experimental catheter 60 by the tension and pressure testing device 40 and the lateral tension testing device 50, the axial strain data and bending strain data of the experimental catheter 60 are respectively obtained by the first strain gauge group and the second strain gauge group.

[0134] According to one embodiment of the present invention, Figure 8 As shown, the jet drilling device 30 has a jet mounting plate 312 slidably arranged on the longitudinal track 22 and a jet bracket 31 arranged on the jet mounting plate 312, the jet bracket 31 is provided with a jet track 313 extending along the axial direction of the experimental catheter 60, the jet track 313 is slidably connected with a nut seat 314, and the jet drill string 32 is connected to the nut seat 314.

[0135] The jet drilling device 30 is connected to the support frame 20. During the simulated drilling process, the jet drill string 32 can move downward along the jet track 313, and can rise along the jet track 313 after the drilling operation is completed; the jet drilling device 30 is a simulated drilling platform, which can better simulate and reproduce the process of lowering the catheter along the drill pipe.

[0136] Specifically, the jet mounting plate 312 is a rectangular plate, and a slider is connected to each of the two ends of the lower side of the jet mounting plate 312, and the two sliders can be respectively clamped on the two slide rails on the beam frame 23. The jet bracket 31 includes a bottom plate and a bracket body 311 vertically arranged on the bottom plate. The bottom plate is a rectangular plate, which is fixed on the upper side of the jet mounting plate 312. The bracket body 311 is a strip extending in the vertical direction, and its bottom end is welded to the bottom plate. The side of the bracket body 311 is provided with a jet track 313 extending along its length direction, and a nut seat 314 is clamped on the jet track 313. The nut seat 314 can slide up and down along the jet track 313. The upper end of the jet drill column 32 is fixed on the nut seat 314, and can then slide up and down following the nut seat 314.

[0137] According to one embodiment of the present invention, Figure 8As shown, the injection bracket 31 is also provided with an injection screw 315 parallel to the injection track 313 , the injection screw 315 is threadedly connected to the nut seat 314 , and one end of the injection screw 315 is drivingly connected to the injection track motor 316 .

[0138] The jet track motor 316 and the jet screw 315 provide power for lowering and recovering the jet drill string 32. The jet track motor 316 drives the jet screw 315 to rotate, thereby driving the nut seat 314 to drive the jet drill string 32 to descend or ascend.

[0139] Specifically, the two ends of the injection screw 315 are respectively connected to the two ends of the bracket body 311 through bearings so as to be rotatable in the axial direction, wherein the length direction of the injection screw 315 is parallel to the extension direction of the injection track 313, and the top of the bracket body 311 is fixed with an injection track motor 316, the output shaft of the injection track motor 316 is drivingly connected to the top of the injection screw 315, and the two are connected together through a coupling, and the injection track motor 316 can drive the injection screw 315 to rotate together. The nut seat 314 is provided with a thread that can mesh with the injection screw 315, and the injection screw 315 passes through the nut seat 314, and the rotation of the injection screw 315 can drive the nut seat 314 to move along the length direction of the injection screw 315, that is, the nut seat 314 slides on the injection track 313.

[0140] According to one embodiment of the present invention, Figure 8 As shown, the jet drill string 32 has a simulated drill rod 321 and a simulated drill bit 322 connected to one end of the simulated drill rod 321, a rotary joint mounting plate 33 is provided on the nut seat 314, a rotary joint 34 and a drill rod motor 35 are provided on the rotary joint mounting plate 33, and the other end of the simulated drill rod 321 can be rotatably passed through the rotary joint 34 and is drivingly connected to the drill rod motor 35.

[0141] The drill rod motor 35 provides power for the rotation of the jet drill string 32 . The rotation of the drill rod motor 35 drives the simulated drill rod 321 and the simulated drill bit 322 to rotate together.

[0142] Specifically, the rotary joint mounting plate 33 is a rectangular plate, which is fixed on the nut seat 314, and the rotary joint mounting plate 33 and the injection track 313 are respectively located on opposite sides of the nut seat 314. A rotary joint 34 is provided on the side of the rotary joint mounting plate 33 away from the nut seat 314, and the injection drill string 32 is rotatably inserted into the rotary joint 34, and the two can be connected through a bearing. The injection drill string 32 includes a simulated drill rod 321 and a simulated drill bit 322 connected together; wherein, the simulated drill rod 321 is rotatably inserted into the rotary joint 34, and its length direction is parallel to the extension direction of the injection track 313, the inner ring of the bearing is fixed on the outer wall surface of the simulated drill rod 321, and the outer ring of the bearing is fixed on the inner side surface of the rotary joint 34. A drill rod motor 35 is also provided on the side of the rotary joint mounting plate 33 away from the nut seat 314. The output shaft of the drill rod motor 35 is drivingly connected to the top end of the simulated drill rod 321. The two are connected together through a coupling. The drill rod motor 35 can drive the simulated drill rod 321 and the simulated drill bit 322 to rotate together.

[0143] According to one embodiment of the present invention, a water injection channel connected to the simulated drill bit 322 is provided in the simulated drill rod 321, and an opening connected to the water injection channel is provided on the rotary joint 34 (not shown in the figure), and the opening is connected to a water injection pipe.

[0144] In this embodiment, the water injection pipe is connected to the water pump, and then high-pressure water flow is introduced into the simulated drill rod 321 and the simulated drill bit 322. The high-pressure water flow is ejected through the simulated drill bit 322, thereby simulating the operation process of jet drilling.

[0145] Specifically, the simulated drill rod 321 is a hollow tubular structure, in which a water injection channel extending along its axial direction is formed. A through hole is opened on the side wall of the simulated drill rod 321 at the position of the rotary joint 34. The opening on the rotary joint 34 is connected to the through hole on the simulated drill rod 321. The opening on the rotary joint 34 is externally connected to a water injection pipe, and the water injection pipe is connected to a water pump.

[0146] When the jet drilling device 30 described in the present invention is drilled, it is necessary to first sleeve the experimental catheter 60 on the outside of the jet drill string 32, and the two are connected together by a bearing, wherein the inner diameter of the bearing is slightly larger than the outer diameter of the jet drill string 32, and the inner ring of the bearing is fixed to the outer wall of the jet drill string 32 by screws; the outer diameter of the bearing is slightly smaller than the inner diameter of the experimental catheter 60, and through holes are drilled on the outer rings of the experimental catheter 60 and the bearing, and the outer ring of the bearing and the inner wall surface of the experimental catheter 60 can be fixed together by bolts.

[0147] According to one embodiment of the present invention, Fig. 9 and Fig.10As shown, a tube straightening device 80 is provided on the upper part of the test tube 10 , and the tube straightening device 80 includes a positioning bar 81 provided on the top of the test tube 10 and a second tube clamp 82 connected to the positioning bar 81 , and the test conduit 60 passes through the second tube clamp 82 .

[0148] By means of the limiting function of the second pipe clamp 82 in the pipe body straightening device 80 , the experimental pipe 60 can be prevented from being significantly tilted during the lowering process of the experimental pipe 60 .

[0149] Specifically, the positioning bar 81 is a strip-shaped piece, and its length is greater than the diameter of the experimental tube 10. The positioning bar 81 is placed on the top of the experimental tube 10. The second pipe clamp 82 is connected to the positioning bar 81. The second pipe clamp 82 is composed of two semicircular pieces, and its structure is basically the same as that of the first pipe clamp 61. The diameter of the second pipe clamp 82 is slightly greater than the outer diameter of the experimental conduit 60. Before the experimental conduit 60 is lowered, the positioning bar 81 is first placed on the top of the experimental tube 10 and moved so that the position of the second pipe clamp 82 is opposite to the position to be drilled, and then the experimental conduit 60 passes through the second pipe clamp 82 from top to bottom. During the lowering process of the experimental conduit 60, it is always confined in the second pipe clamp 82.

[0150] Preferably, the diameter of the second pipe clamp 82 connected to the positioning bar 81 can be adjusted to accommodate the lowering operation of the experimental catheter 60 of different sizes.

[0151] According to one embodiment of the present invention, Figure 2 and Fig. 9 As shown, a second transverse track 24 is provided at the bottom of the support frame 20 , and the test cylinder 10 is slidably disposed on the second transverse track 24 via the rollers 15 at the bottom thereof.

[0152] By providing the second transverse track 24 , the test cylinder 10 can be easily removed from the support frame 20 , thereby facilitating replacement of the soil in the test cylinder 10 during the experiment, and also facilitating inspection of the soil and cleaning of the test cylinder 10 .

[0153] Specifically, the second transverse track 24 includes two guide grooves arranged in parallel. Two groups of rollers 15 are arranged on the lower side of the bottom plate 11 of the experimental cylinder 10. The rollers 15 can roll in the guide grooves.

[0154] According to one embodiment of the present invention, Fig. 9 As shown, a drain port 12 is provided on the side wall of the bottom of the test tube 10. The liquid in the test tube 10 can be discharged through the drain port 12 to control the experimental conditions during the experiment; it can also be convenient to empty the experimental soil in the test tube 10 after the experiment to prevent a large amount of soil from adhering to the inner wall of the test tube 10.

[0155] Preferably, a plurality of drain ports 12 are provided on the side wall of the test tube 10 to accelerate the discharge of the liquid in the test tube 10 .

[0156] Implementation method 2:

[0157] The present invention also provides a method for testing the load-bearing performance of a catheter. The method is implemented using the catheter load-bearing performance testing system described in Embodiment 1, and comprises the following steps:

[0158] Step S1: installing and checking the catheter load-bearing performance test system;

[0159] Step S2: placing the test soil in layers in the test tube 10;

[0160] Step S3: installing a strain sensor module 70 on the experimental catheter 60 and connecting it to a data acquisition instrument;

[0161] Step S4: Move the jet drilling device 30 to the first drilling position, fix the test pipe 60 on the jet drill string 32 and lower it into the test soil body along with the jet drill string 32 to a set depth;

[0162] Step S5: After the soil is left to stand for a target time to recover its strength, disconnect the test pipe 60 from the jet drill string 32, lift the jet drill string 32 and remove the jet drilling device 30, and move the tension and pressure test device 40 to the top of the test pipe 60;

[0163] Step S6: applying downward pressure to the test tube 60 step by step through the tension and pressure head 42, recording the load-settlement curve and / or axial strain of the test tube 60, and stopping the test when a steep slope appears in the load-settlement curve.

[0164] The catheter load-bearing performance testing method of the present invention can test the anti-compression performance of the experimental catheter 60. The load-settlement curve of the experimental catheter 60 is obtained through the tension and pressure testing device 40, and the maximum compressive load of the experimental catheter 60 is obtained according to the mutation point of the curve; the axial strain curve of the experimental catheter 60 is obtained through the strain sensor module 70, and the anti-axial deformation ability of the experimental catheter 60 is obtained according to the analysis of the curve.

[0165] Specifically, in step S2: test soil configured to simulate on-site soil conditions is placed in layers in the test tube 10, and each layer of soil is compacted after placement to ensure uniform soil quality, and no or a calculated volume of water / brine / other solution is injected according to experimental requirements.

[0166] In step S3: a strain gauge is attached to the outer wall surface of the experimental catheter 60, and the wiring connected to the strain gauge is led out, connected to a data acquisition instrument, and connected to a computer.

[0167] In step S4: the jet drilling device 30 is moved to a pre-set first lowering position through the first transverse track 21 and the longitudinal track 22 and the experimental guide tube 60 is fixed on the jet drill string 32, the rotation speed is specified, the drill pipe motor 35 is turned on, the water pump is turned on, the simulated drill bit 322 starts to jet, the jet track motor 316 is turned on, and the experimental guide tube 60 starts to be lowered. After reaching the specified position, the jet track motor 316 is turned off, the lowering is stopped, and the water pump and the drill pipe motor 35 are turned off.

[0168] In step S5: after the soil recovers its strength, the positions of the jet drilling device 30 and the tension and pressure testing device 40 are adjusted through the longitudinal track 22 so that the tension and pressure head 42 on the tension and pressure testing device 40 is vertically opposite to the test conduit 60 in the soil.

[0169] In step S6: install the designed and manufactured ballast head on the tension and pressure testing machine 41, turn on the tension and pressure testing machine 41, and connect it to the computer, control the ballast head to descend until it just contacts the top surface of the test tube 60, reset the displacement sensor, and start the experiment; adopt the form of graded loading, and after each level of loading is stable, proceed to the next level of loading; after each level of loading is completed, record the corresponding data, including the load applied by the ballast head, the displacement of the test tube 60, and the axial strain of the test tube 60, etc.

[0170] According to one embodiment of the present invention, after completing the above-mentioned ballasting test, the catheter load-bearing performance testing method further includes the following steps:

[0171] Step S7: lowering the test pipe 60 to a set depth of the second drilling position through the jet drilling device 30;

[0172] Step S8: After the soil is left to stand for a target time to recover its strength, disconnect the test pipe 60 from the jet drill string 32, lift the jet drill string 32 and remove the jet drilling device 30, and move the tension and pressure test device 40 to the top of the test pipe 60;

[0173] Step S9: Apply tension to the experimental catheter 60 through the tension and pressure head 42, record the time-load curve of the experimental catheter 60, and stop the experiment when the load begins to decrease.

[0174] The above method can test the axial tensile resistance of the experimental catheter 60 , obtain the time-sedimentation curve of the experimental catheter 60 through the tension pressure testing device 40 , and obtain the maximum tensile load of the experimental catheter 60 according to the peak point of the curve.

[0175] In step S7: it actually repeats the above steps S3 and S4, and re-inserts a new test conduit 60 into a different position in the test soil. If the test soil needs to be replaced, the above step S2 is performed at the same time to replace the soil in the test tube 10.

[0176] In step S8: after the soil recovers its strength, the positions of the jet drilling device 30 and the tension and pressure testing device 40 are adjusted through the longitudinal track 22 so that the tension and pressure head 42 on the tension and pressure testing device 40 is vertically opposite to the test conduit 60 in the soil.

[0177] In step S9: install the designed and manufactured pulling head on the tension and pressure testing machine 41 and connect it to the experimental catheter 60, turn on the tension and pressure testing machine 41, connect it to the computer, clear the displacement sensor, and start the experiment; slowly lift the experimental catheter 60 through the tension and pressure testing machine 41 at a fixed speed, and stop the experiment when the load begins to gradually decrease; record the corresponding data during the process of slowly pulling up the experimental catheter 60, including the tension applied by the pulling head (that is, the load borne) and the displacement of the experimental catheter 60.

[0178] The pulling test in the above step S9 is not based on the ballasting test in step S6, and there is no strict order between the two. The ballasting test and the pulling test are independent of each other, and the above two test processes can be selected according to specific test needs.

[0179] In a preferred embodiment of the present invention, after completing the above-mentioned ballasting test or pulling test, the following steps are also included:

[0180] Step S10: lowering the test pipe 60 to a set depth of a third drilling position through the jet drilling device 30;

[0181] Step S11: After the soil is left to stand for a target time to recover its strength, the connection between the test pipe 60 and the jet drill string 32 is disconnected, the jet drill string 32 is lifted and the jet drilling device 30 is removed;

[0182] Step S12: connecting the transverse tension test device 50 to apply horizontal tension to the test conduit 60 step by step, and recording the load-displacement curve and / or bending strain of the test conduit 60 .

[0183] The above method can test the radial (horizontal) tensile performance of the experimental catheter 60. The load-displacement curve of the experimental catheter 60 is obtained through the lateral tension testing device 50, and the horizontal maximum tensile load of the experimental catheter 60 is obtained according to the mutation point of the curve; the bending strain curve of the experimental catheter 60 is obtained through the strain sensor module 70, and the bending deformation resistance of the experimental catheter 60 is obtained according to the analysis of the curve.

[0184] In step S10: it actually repeats the above steps S3 and S4, and reinserts a new test conduit 60 into a different position in the test soil. If the test soil needs to be replaced, the above step S2 is performed at the same time to replace the soil in the test tube 10.

[0185] In step S11 : after the soil recovers its strength, the position of the jet drilling device 30 is adjusted through the longitudinal track 22 .

[0186] In step S12: connect the lateral tension test device 50, connect one end of the cable 51 to the first pipe clamp 61 on the experimental conduit 60, and pass the other end of the cable 51 around the first fixed pulley 52, the second fixed pulley 54 and the third fixed pulley 55 in sequence and then connect to the counterweight 53; start to apply the weight of the counterweight 53 in stages, and after each level of loading is stable, record the weight (load) of the counterweight 53 and the displacement of the counterweight 53, and at the same time record the bending deformation of the experimental conduit 60, and proceed to the next level of loading. After all the heavy-weight levels of loading are completed, end the experiment.

[0187] The transverse tensile test in the above step S12 is not based on the ballasting test in step S6 and the pulling test in step S9. There is no strict sequence among the three. The transverse tensile test, ballasting test and pulling test are independent of each other. The above three test processes can be selected according to specific test needs.

[0188] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A catheter load-bearing performance testing system, characterized in that: include: An experimental cylinder is arranged in the support frame, and the experimental cylinder can be filled with soil; A jet drilling device, which is movably arranged on the support frame and located at the upper end of the experimental tube, the jet drilling device has a jet drill string that can move along the axial direction of the experimental tube, and the experimental conduit arranged outside the jet drill string can be lowered into the soil body along with the jet drill string; A tension and pressure test device, which is movably arranged on the support frame and located at the upper end of the test tube, and the tension and pressure test device has a tension and pressure head that can drive the test tube to move up and down along its axial direction; A transverse tension test device, which is connected to the support frame and the experimental catheter and can provide a tensile force along the radial direction of the experimental catheter; The strain sensor module is arranged on the outer side wall of the experimental catheter and is used to obtain the axial strain and / or bending strain of the experimental catheter.

2. The catheter load-bearing performance testing system according to claim 1, characterized in that: A first transverse track is arranged on the top of the support frame, a beam frame is slidably connected to the first transverse track, a longitudinal track perpendicular to the first transverse track is arranged on the beam frame, and the jet drilling device and the tension and pressure testing device are both slidably connected to the longitudinal track.

3. The catheter load-bearing performance testing system according to claim 2, characterized in that: The tensile and compressive testing device comprises a tensile and compressive testing machine, which is slidably connected to the longitudinal track via a tensile and compressive mounting plate at the bottom thereof. The tensile and compressive head on the tensile and compressive testing machine faces the top end of the experimental tube and comprises a ballast head and a pulling head. The ballast head can be pressed on the top end of the experimental tube and move toward the experimental tube, and the pulling head can be connected to the experimental tube and move away from the experimental tube.

4. The catheter load-bearing performance testing system according to claim 1, characterized in that: The lateral tension testing device includes a cable. A first pipe clamp and a first fixed pulley are respectively provided on the outer wall of the test tube and the inner wall of the test cylinder, which are opposite to each other in the radial direction of the test cylinder. One end of the cable is connected to the first pipe clamp, and the other end of the cable passes around the first fixed pulley in the radial direction of the test cylinder, then extends out of the test cylinder and is connected to a counterweight block.

5. The catheter load-bearing performance testing system according to claim 4, characterized in that: An adjustment track extending along the axial direction of the experimental cylinder is provided on the inner side wall thereof, the first fixed pulley is slidably arranged on the adjustment track, and the installation position of the first pipe clamp can be adjusted with the position of the first fixed pulley.

6. The catheter load-bearing performance testing system according to claim 4 or 5, characterized in that: The support frame is provided with a second fixed pulley and a third fixed pulley, and the other end of the cable passes around the first fixed pulley, the second fixed pulley and the third fixed pulley in sequence, then extends vertically downward and is connected to the counterweight block.

7. The catheter load-bearing performance testing system according to claim 1, characterized in that: The strain sensor module includes at least one first strain gauge group and / or at least one second strain gauge group; The first strain gauge group includes four first strain gauges attached to opposite positions of the side wall of the experimental catheter, and two first strain gauges located on the same side of the experimental catheter are perpendicular to each other; The second strain gauge group includes four second strain gauges attached to opposite positions of the side wall of the experimental catheter, and two second strain gauges located on the same side of the experimental catheter are parallel to each other.

8. The catheter load-bearing performance testing system according to claim 2 or 3, characterized in that: The jet drilling device comprises a jet mounting plate slidably arranged on the longitudinal track and a jet bracket arranged on the jet mounting plate, the jet bracket is provided with a jet track extending along the axial direction of the experimental catheter, a nut seat is slidably connected to the jet track, and the jet drill string is connected to the nut seat.

9. The catheter load-bearing performance testing system according to claim 8, characterized in that: The injection support is also provided with an injection screw parallel to the injection track. The injection screw is threadedly connected to the nut seat, and one end of the injection screw is drivingly connected to the injection track motor.

10. The catheter load-bearing performance testing system according to claim 9, characterized in that: The jet drill string comprises a simulated drill rod and a simulated drill bit connected to one end of the simulated drill rod, a rotary joint mounting plate is provided on the nut seat, a rotary joint and a drill rod motor are provided on the rotary joint mounting plate, and the other end of the simulated drill rod can rotatably pass through the rotary joint and be drivingly connected to the drill rod motor.

11. The catheter load-bearing performance testing system according to claim 10, characterized in that: A water injection channel connected to the simulated drill bit is provided in the simulated drill rod, an opening connected to the water injection channel is provided on the rotary joint, and a water injection pipe is connected to the opening.

12. The catheter load-bearing performance testing system according to claim 2, characterized in that: The first transverse rail comprises a transverse rail body and a transverse rail lead screw arranged parallel to the transverse rail body, a transverse rail slider is threadedly connected to the transverse rail lead screw, the beam frame is mounted on the transverse rail slider, and one end of the transverse rail lead screw is drivingly connected to a transverse rail motor.

13. The catheter load-bearing performance testing system according to claim 2 or 12, characterized in that: The longitudinal rail comprises a longitudinal rail body and a longitudinal rail lead screw arranged parallel to the longitudinal rail body, a top block is threadedly connected to the longitudinal rail lead screw, the top block is connected to the tension and pressure testing device, and one end of the longitudinal rail lead screw is connected to a shaking handle.

14. The catheter load-bearing performance testing system according to claim 1, characterized in that: A tube body straightening device is arranged on the upper part of the experimental cylinder. The tube body straightening device comprises a positioning bar arranged on the top of the experimental cylinder and a second tube clamp connected to the positioning bar. The experimental conduit passes through the second tube clamp.

15. The catheter load-bearing performance testing system according to claim 1 or 2, characterized in that: A second transverse track is arranged at the bottom of the support frame, and the experimental cylinder is slidably arranged on the second transverse track through rollers at the bottom thereof.

16. The catheter load-bearing performance testing system according to claim 1, characterized in that: A water outlet is arranged on the side wall of the bottom of the experimental cylinder.

17. A method for testing the load-bearing performance of a catheter, characterized in that: The test method is implemented by using a catheter load-bearing performance test system as described in any one of claims 1 to 16, and comprises: Install and inspect the catheter load-bearing performance test system; Putting test soil in layers into the experimental cylinder; The strain sensor module is arranged on the experimental catheter and connected to a data acquisition instrument; The jet drilling device is moved to a first drilling position, and the test pipe is fixed on the jet drill string and lowered into the test soil body along with the jet drill string to a set depth; After the soil is left to stand for a target time to recover its strength, the connection between the test conduit and the jet drill string is disconnected, the jet drill string is lifted and the jet drilling device is removed, and the tension and pressure test device is moved above the test conduit; The downward pressure is applied to the experimental conduit step by step through the tension and pressure head, and the load-settlement curve and / or axial strain of the experimental conduit are recorded. The experiment is stopped when a steep slope section appears on the load-settlement curve.

18. The method for testing the load-bearing performance of a catheter according to claim 17, characterized in that: After completing the above ballast test, it also includes: Lowering the test pipe to a set depth of a second drilling position by the jet drilling device; After the soil is left to stand for a target time to recover its strength, the connection between the test conduit and the jet drill string is disconnected, the jet drill string is lifted and the jet drilling device is removed, and the tension and pressure test device is moved above the test conduit; Apply tension to the experimental catheter through the tension and pressure head, record the time-load curve of the experimental catheter, and stop the experiment when the load begins to decrease.

19. The method for testing the load-bearing performance of a catheter according to claim 17 or 18, characterized in that: After completing the above-mentioned ballast test or pull-out test, it also includes: The test pipe is lowered to a set depth of a third drilling position by the jet drilling device; After the soil is left to stand for a target time and recovers its strength, the connection between the test conduit and the jet drill string is disconnected, the jet drill string is lifted and the jet drilling device is removed; The lateral tension test device is connected to apply horizontal tension to the experimental conduit step by step, and the load-displacement curve and / or bending strain of the experimental conduit is recorded.

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