Push rod clamping device for measuring crustal stress in upward hole by adopting hydraulic fracturing method

Abstract

The utility model provides a push rod clamping device for measuring ground stress in an upward hole by adopting a hydraulic fracturing method, which comprises a base, a support column and a lifting mechanism capable of bearing a push rod body are arranged on the base, and a clamping component capable of stabilizing a rod body of the push rod body is arranged at the upper part of the support column. By means of the stable structure of the base and the supporting column and accurate control over the lifting mechanism, the requirement that manpower directly participates in the pushing process of the push rod body is greatly reduced, safety accidents possibly caused by improper manual operation are avoided, compared with a traditional manual pushing mode, the labor cost is saved, and the labor intensity of workers is lowered. And the operation time is obviously shortened, and the efficiency of the whole measurement work is improved. In addition, the clamping assembly ensures the vertical stability of the push rod body in the lifting process, measurement errors caused by shaking or inclination are avoided, and the accuracy of measured data is improved.

Description

Technical Field

[0002] The utility model relates to the technical field of in-situ stress measurement equipment, in particular to a push rod clamping device for measuring in-situ stress by the hydraulic fracturing method in an upward hole.

Background Art

[0004] In the field of coal mining, for the need of in-situ stress measurement, the small-diameter hydraulic fracturing technology, as an efficient means for rapid evaluation of in-situ stress, has been widely applied. This technology is particularly suitable for on-site measurement of in-situ stress in coal and rock masses.

[0005] During actual measurement, a key link is to arrange the observation hole above the roof, and it is necessary to manually push the supporting push rod in the test equipment to the predetermined measurement depth (about 20 meters inside the roof measurement hole). This process faces major challenges: due to the depth of the measurement hole reaching 20 meters, the combined weight of the finally connected push rods is very high. Relying solely on manpower is not only extremely laborious to operate, but also poses significant safety risks that cannot be ignored, such as personnel injury or accidental slipping of equipment, and it also has a non-negligible impact on the measurement accuracy.

Content of the Utility Model

[0007] The purpose of the utility model is to provide a push rod clamping device for measuring in-situ stress by the hydraulic fracturing method in an upward hole, which can reduce the manpower burden, lower the operation risk, and improve the measurement accuracy, aiming to solve the above problems existing in the current measurement of in-situ stress by the hydraulic fracturing method.

[0008] The utility model is realized by the following technical solutions:

[0009] A push rod clamping device for measuring in-situ stress by the hydraulic fracturing method in an upward hole, comprising a base, a support column arranged on the base, and a lifting mechanism capable of supporting the push rod body, and a clamping assembly capable of stabilizing the rod body of the push rod is arranged on the upper part of the support column.

[0010] As described above, a push rod clamping device for measuring in-situ stress by the hydraulic fracturing method in an upward hole, the clamping assembly comprises a detachably connected fixing block arranged on the upper part of the support column, and a clamp for fixing the rod body of the push rod is connected to one side of the fixing block.

[0011] As described above, a push rod clamping device for measuring in-situ stress by the hydraulic fracturing method in an upward hole, the clamp is a four-jaw chuck.

[0012] As described above, a push rod clamping device for measuring in-situ stress by the hydraulic fracturing method in an upward hole, the support column comprises a lower support column connected to the base, an upper support column is detachably connected to the upper end of the lower support column, and the fixing block is detachably connected to the upper part of the upper support column.

[0013] A push rod clamping device for measuring in-situ stress by hydraulic fracturing method in a vertical upward hole. Multiple assembly holes are evenly arranged along the length direction on the upper part of the upper support column. Fasteners corresponding to the assembly holes are provided on the fixing block to realize the height adjustment of the fixing block.

[0014] A push rod clamping device for measuring in-situ stress by hydraulic fracturing method in a vertical upward hole. The lifting mechanism includes a lifting platform that provides support for the push rod body, and a lifting device is connected between the lifting platform and the base.

[0015] A push rod clamping device for measuring in-situ stress by hydraulic fracturing method in a vertical upward hole. The lifting device includes a hydraulic power device arranged on the base. A hydraulic rod is provided on the hydraulic power device. The hydraulic rod is connected with a cross-shaped lifting frame. The bottom of the cross-shaped lifting frame is connected with the base, and the top is connected with the lifting platform. When the length of the hydraulic rod changes, the height of the cross-shaped lifting frame changes accordingly.

[0016] A push rod clamping device for measuring in-situ stress by hydraulic fracturing method in a vertical upward hole. A positioning device for restricting the horizontal displacement of the lower end of the push rod body is provided at the upper end of the lifting platform.

[0017] A push rod clamping device for measuring in-situ stress by hydraulic fracturing method in a vertical upward hole. The positioning device is a sleeve provided with a positioning hole matching the caliber of the push rod body.

[0018] A push rod clamping device for measuring in-situ stress by hydraulic fracturing method in a vertical upward hole. The sleeve is a conical sleeve with a gradually decreasing cross-sectional area from bottom to top.

[0019] Compared with the prior art, the utility model has the following advantages:

[0020] Through the stable structure of the base and the support column, and the precise control of the lifting mechanism, the need for direct human participation in the pushing process of the push rod body is greatly reduced, thus avoiding potential safety accidents caused by improper manual operation. Compared with the traditional manual pushing method, it not only saves labor costs but also significantly shortens the operation time and improves the efficiency of the overall measurement work. In addition, the clamping assembly ensures the vertical stability of the push rod body during the lifting process, avoids measurement errors caused by shaking or tilting, and improves the accuracy of the measurement data.

Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the utility model, the drawings required for the description of the embodiments will be briefly introduced below.

[0023] Figure 1This is a structural state diagram of the embodiment of the present utility model when pushing the push rod body upward;

[0024] Figure 2 This is a structural state diagram of the embodiment of the present utility model when installing or disassembling the push rod body;

[0025] Figure 3 This is a top view of the clamping assembly in the embodiment of the present utility model;

[0026] Figure 4 This is a top view of the connection state of the positioning device and the lifting platform in the embodiment of the present utility model;

[0027] Figure 5 is Figure 4 a sectional view taken along A-A in

Specific Embodiment

[0029] In order to make the technical problems, technical solutions and beneficial effects solved by the present application clearer, the following further details the present application in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0030] Please refer to Figures 1 to 5 , this embodiment provides a push rod clamping device for measuring in-situ stress by hydraulic fracturing method in an upward hole, including a base 1, a support column 2 is provided on the base 1, and a lifting mechanism 4 for supporting the push rod body 3, and a clamping assembly 5 for stabilizing the rod body of the push rod body 3 is provided on the upper part of the support column 2.

[0031] The base 1 serves as the foundation of the entire device, used to support and fix other components. The base can be made of a strong material. In this embodiment, a steel plate with dimensions of 50 cm * 50 cm * 1 cm in length, width and height is used as the base to ensure the stability of the entire device. In some other embodiments, the base 1 can also be set to other size specifications, and anti-slip pads and adjustable feet can also be added to adapt to different terrains.

[0032] The support column 2 is vertically fixed on the base 1, used to provide vertical support. The support column 2 can be made of metal or other high-strength materials to bear the weight of the push rod body 3 and the forces during the measurement process. In addition, the support column 2 can be selected to be of single-section or multi-section design. When using a multi-section design, each section is connected by high-strength bolts, which is convenient for adjusting the overall height of the device according to the distance to the upward hole.

[0033] The lifting mechanism 4 is installed on one side of the support column 2, and an electric or hydraulic drive mode can be selected, and the push rod body 3 is smoothly lifted and lowered through a precise transmission structure such as a lead screw and a gear.

[0034] The clamping assembly 5 is arranged at the upper part of the support column 2 and is used to stabilize the rod body of the push rod body. The clamping assembly 5 can include clamping jaws, a clamping device or a locking mechanism, etc., to ensure that the push rod body will not shake or shift during the disassembly, assembly and measurement processes.

[0035] Specifically, the setting of the clamping assembly 5 avoids manually grasping the push rod body, making the operation of personnel more convenient, faster and safer during the disassembly and assembly of the measuring equipment; the setting of the lifting mechanism 4 improves the measuring efficiency, makes the test environment more stable, and greatly improves the safety.

[0036] Furthermore, as a preferred implementation manner of this solution rather than a limitation, the clamping assembly 5 includes a fixed block 51 detachably connected to the upper part of the support column 2. A gripper 52 capable of fixing the rod body of the push rod body 3 is connected to one side of the fixed block 51. The gripper 52 is preferably a four-jaw chuck.

[0037] In this embodiment, the fixed block 51 and the support column 2 can be detachably connected by means of bolt connection, pin connection or other methods, which is convenient for replacement or adjustment when needed. The gripper 52 can be welded or bolted to one side of the fixed block 51 to fix the rod body of the push rod body 3, provide a stable clamping force, prevent the push rod body 3 from shaking or shifting, and thus improve the accuracy and reliability of the measurement results. The gripper 52 can adopt various forms, such as a pliers-type gripper, a jaw-type gripper or a cylinder-type gripper, etc. Specifically, it is preferably a four-jaw chuck, which has good adaptability, stable clamping and convenient operation. It can be foreseen that in some other embodiments, a three-jaw chuck can also be used as the gripper 52.

[0038] Furthermore, as a preferred implementation manner of this solution rather than a limitation, the support column 2 includes a lower support column 21 connected to the base 1. The upper end of the lower support column 21 is detachably connected to an upper support column 22, and the fixed block 51 is detachably connected to the upper part of the upper support column 22.

[0039] In this embodiment, the support column 2 is of a two-section design, and the lower support column 21 and the upper support column 22 are connected by a threaded connector, which is convenient for carrying underground.

[0040] Specifically, the lower support column 21 and the upper support column 22 are respectively steel pipes with a length of 1 m, and the lower support column 21 is welded to the base 1. A plurality of assembly holes 221 are uniformly arranged along the length direction at the upper part of the upper support column 22 for cooperating with the fasteners 521 on the fixed block 51 to realize the height adjustment of the fixed block 51. The assembly holes 221 can be threaded holes or through holes, and the fasteners 521 can be bolts or pins corresponding to the form of the assembly holes 221. The settings of the assembly holes 221 and the fasteners 521 further improve the flexibility and adaptability of the push rod clamping device.

[0041] Further, as a preferred implementation manner rather than a limitation of this solution, the lifting mechanism 4 includes a lifting platform 41 that provides support for the push rod body 3, and a lifting device 42 is connected between the lifting platform 41 and the base 1.

[0042] In this embodiment, the lifting platform 41 is used to provide support for the bottom of the push rod body 3 to ensure its stability during the lifting process. The lifting device 42 can be selected from screw jacks, hydraulic cylinders, air cylinders, etc., to provide stable and controllable lifting support for the push rod body 3.

[0043] Further, as a preferred implementation manner rather than a limitation of this solution, the lifting device 42 includes a hydraulic power device 421 provided on the base 1. A hydraulic rod 422 is provided on the hydraulic power device 421. The hydraulic rod 422 is connected to a cross lifting frame 423. The bottom of the cross lifting frame 423 is connected to the base 1, and the top is connected to the lifting platform 41. When the length of the hydraulic rod 422 changes, the height of the cross lifting frame 423 changes accordingly.

[0044] In this embodiment, the hydraulic power device 421 is arranged on the base 1 to provide hydraulic energy and drive the hydraulic rod 422 to perform mechanical telescopic motion. One end of the hydraulic rod 422 is connected to the hydraulic power device 421, and the other end is connected to the upper part of the link mechanism of the cross lifting frame 423. When the hydraulic rod 422 expands and contracts, through the action of the link mechanism, the height of the cross lifting frame 423 changes, thereby driving the lifting platform 41 to rise or fall. Generally speaking, in this embodiment, by adopting the structural design of the hydraulic power device 421 cooperating with the cross lifting frame 423, the stability and reliability of the lifting device 42 are further improved, providing safer and more efficient lifting support for the push rod clamping device to measure in-situ stress by the hydraulic fracturing method in the upward hole.

[0045] Further, as a preferred implementation manner rather than a limitation of this solution, a positioning device 411 for restricting the horizontal displacement of the lower end of the push rod body 3 is provided at the upper end of the lifting platform 41.

[0046] In this embodiment, in order to ensure that the push rod body 3 remains stable on the lifting platform and prevent its horizontal displacement during the lifting process, a positioning device 411 is provided at the upper end of the lifting platform 41. Specifically, the positioning device 411 includes, but is not limited to, limit blocks, clamping claws, and other structures that can play a role in restricting horizontal displacement, further improving the control stability of the push rod clamping device.

[0047] Further, as a preferred implementation manner of this solution rather than a limitation, the positioning device 411 is a sleeve provided with a positioning hole 412 matching the caliber of the push rod body 3. The bottom of the sleeve is welded to the lifting platform 41, and the sleeve is a conical sleeve with a gradually decreasing cross-sectional area from bottom to top.

[0048] In this embodiment, the setting of the positioning hole 412 enables the inner wall of the conical sleeve to fit the push rod body 3, which can automatically center and ensure that the center of the push rod body coincides with the center of the positioning device, further improving the clamping stability of the push rod clamping device. Selecting a conical sleeve means it has a larger bottom area and a more stable connection with the lifting platform 41. Generally speaking, by adopting the positioning device 411 with a conical sleeve structure in this embodiment, the stability and measurement accuracy of the push rod clamping device when measuring in-situ stress by the hydraulic fracturing method in an upward hole are further improved.

[0049] The working principle of the present utility model:

[0050] A push rod clamping device for measuring in-situ stress by the hydraulic fracturing method in an upward hole mainly includes a base, a support column, a lifting mechanism, a clamping assembly, etc.

[0051] Specifically, when pushing the push rod body upward into the upward hole, the gripper, that is, the four-jaw chuck, releases the push rod body, and then the lifting device in the lifting mechanism is used to push it upward.

[0052] When it is necessary to install or disassemble the push rod body, the upper connection of the bottom of the push rod is fixed with the gripper, that is, the four-jaw chuck, and then the lower push rod is manually installed or disassembled.

[0053] When disassembling the last push rod body, after removing the previous push rod body, the lifting platform is raised to near the four-jaw chuck, the conical sleeve is aligned with the gripper, that is, the four-jaw chuck, and then the chuck is loosened to allow the push rod body to freely fall into the positioning hole of the lower conical sleeve.

[0054] The above are the implementation manners provided in combination with specific contents, and it is not considered that the specific implementation of this application is only limited to these descriptions. Any structure similar to the method of this application, or several technical deductions or substitutions made under the premise of the concept of this application, should be regarded as the protection scope of this application.

Claims

1. A push rod clamping device for measuring in-situ stress by hydraulic fracturing method in upward holes, characterized in that: It includes a base (1), on which there are support columns (2) and a lifting mechanism (4) that can support the push rod body (3), and a clamping assembly (5) for stabilizing the rod body of the push rod body (3) is provided on the upper part of the support column (2).

2. The push rod clamping device for measuring in-situ stress by hydraulic fracturing method in a vertical hole according to claim 1, characterized in that, The clamping assembly (5) includes a fixed block (51) detachably connected to the upper part of the support column (2), and a gripper (52) for fixing the rod body of the push rod body (3) is connected to one side of the fixed block (51).

3. The push rod clamping device for measuring in-situ stress by hydraulic fracturing method in vertical holes according to claim 2, characterized in that, The gripper (52) is a four-jaw chuck.

4. The push rod clamping device for measuring in-situ stress by hydraulic fracturing method in vertical holes according to claim 3, characterized in that, The support column (2) includes a lower support column (21) connected to the base (1), an upper support column (22) is detachably connected to the upper end of the lower support column (21), and the fixed block (51) is detachably connected to the upper part of the upper support column (22).

5. A push rod clamping device for measuring in-situ stress by hydraulic fracturing method in vertical holes, characterized in that, A plurality of assembly holes (221) are evenly arranged along the length direction on the upper part of the upper support column (22), and fasteners (521) corresponding to the assembly holes (221) are provided on the fixed block (51) to realize the height adjustment of the fixed block (51).

6. A push rod clamping device for measuring in-situ stress by hydraulic fracturing method in a vertical upward hole, according to any one of claims 1-5, characterized in that, The lifting mechanism (4) includes a lifting platform (41) that provides support for the push rod body (3), and a lifting device (42) is connected between the lifting platform (41) and the base (1).

7. The push rod clamping device for measuring in-situ stress by hydraulic fracturing method in a vertical upward hole according to claim 6, characterized in that, The lifting device (42) includes a hydraulic power device (421) provided on the base (1), a hydraulic rod (422) is provided on the hydraulic power device (421), the hydraulic rod (422) is connected to a cross lifting frame (423), the bottom of the cross lifting frame (423) is connected to the base (1), and the top is connected to the lifting platform (41). When the length of the hydraulic rod (422) changes, the height of the cross lifting frame (423) changes accordingly.

8. A push rod clamping device for measuring in-situ stress by hydraulic fracturing method in vertical holes, characterized in that, A positioning device (411) for restricting the horizontal displacement of the lower end of the push rod body (3) is provided at the upper end of the lifting platform (41).

9. A push rod clamping device for measuring in-situ stress by hydraulic fracturing method in a vertical hole according to claim 8, characterized in that, The positioning device (411) is a sleeve provided with a positioning hole (412) matching the caliber of the push rod body (3).

10. The push rod clamping device for measuring in-situ stress by hydraulic fracturing method in vertical holes according to claim 9, characterized in that, The sleeve is a conical sleeve with a gradually decreasing cross-sectional area from bottom to top.

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