Directly-buried in-situ test device for frost heaving force of frozen soil

Abstract

The utility model relates to the technical field of frozen soil detection, and discloses a directly-buried frozen soil frost heaving force in-situ testing device which comprises a pre-buried cylinder, a measuring through groove is formed in the outer periphery of the pre-buried cylinder, and a motor is installed at the top of an inner cavity of an installation cylinder; the driving gear is coaxially connected to the bottom end of the motor, a transmission gear is inserted in the position, corresponding to the driving gear, of the left side of the interior of the mounting cylinder through a bearing, the lower side of the exterior of the mounting cylinder is sleeved with a clamping ring, and an assembling ring frame is inserted in the clamping ring; and the gear ring is installed at the top end of the assembly ring frame, and a pressure sensor is inserted into the installation ring. According to the direct-buried frozen soil frost heaving force in-situ testing device, a motor drives a driving gear to rotate, so that a transmission gear can drive a gear ring to rotate, the circumferential angles of a mounting ring and a pressure sensor can be adjusted, and the pressure sensor can capture the change of frost heaving force at different angles; this helps to obtain more comprehensive and accurate data.

Description

Technical Field

[0001] The utility model relates to the technical field of frozen soil detection, in particular to a direct-buried in-situ test device for frozen soil frost heaving force. Background Technique

[0002] Under natural conditions, soil cannot reach an absolutely dense state, and the pores in the soil are often filled with water and gas. When the soil moisture content is high enough and the environmental temperature is low enough, the water in the soil will change from a liquid state to a solid state, and then frozen soil is formed. Frozen soil is a special type of soil. The seasonal change of the water state in the soil will form seasonal frozen soil, and the water in the soil remains in a solid state all year round to form permafrost. Due to the change of the water state in the soil, the volume of the frozen soil changes, which in turn causes soil frost heaving. The occurrence of frost heaving will cause changes in the internal stress of the soil. We call this internal stress caused by frost heaving the frost heaving force. When the frost heaving force reaches a certain scale, it will cause irreversible diseases in buildings, pipelines, highways, railways, tunnels, etc. Therefore, in the exploration of frozen soil areas, it is necessary to evaluate the degree of frozen soil frost heaving force.

[0003] The common direct-buried in-situ test device for frozen soil frost heaving force consists of a flange, a measuring rod and a sensor. When in use, the sensor is first installed inside the measuring rod, and then the measuring rod is inserted into the frozen soil to ensure that the device is tightly combined with the frozen soil to accurately simulate the natural state of the frozen soil. Then, the data acquisition system is started to record the temperature and frost heaving force data of the frozen soil in real time.

[0004] However, in this method, since the installation position of the sensor inside the measuring rod is fixed, and since the measuring rod is inserted into the frozen soil when measuring the frost heaving force, it is not convenient to adjust. Therefore, the sensor at a single point position cannot capture the changes in frost heaving force at different depths and angles, which is not conducive to obtaining more comprehensive and accurate data, reduces the accuracy of the frost heaving force test data, increases the test error, and cannot meet the working requirements of frozen soil detection. For this reason, a direct-buried in-situ test device for frozen soil frost heaving force is proposed. Content of the Utility Model

[0005] (1) Technical Problems to be Solved

[0006] Aiming at the deficiencies of the prior art, the utility model provides a direct-buried in-situ test device for frozen soil frost heaving force to solve the technical problem that since the measuring rod is inserted into the frozen soil when measuring the frost heaving force, it is not convenient to adjust, and thus the sensor at a single point position cannot capture the changes in frost heaving force at different depths and angles.

[0007] (2) Technical Solutions

[0008] To achieve the above purpose, the utility model provides the following technical solutions: A direct-buried in-situ test device for frozen soil frost heaving force, comprising:

[0009] Embedded cylinder, a measurement through groove is circumferentially formed on the outer circumference of the embedded cylinder, a end cover is installed at the top end of the embedded cylinder, an assembly column is installed in the middle of the upper surface of the end cover, and a lead screw is screwed inside the assembly column;

[0010] Ball bearing, sleeved at the bottom of the lead screw, a flange is welded to the bottom end of the ball bearing, an installation cylinder is installed at the bottom of the flange, and a motor is installed at the top of the inner cavity of the installation cylinder;

[0011] Drive gear, coaxially connected to the bottom end of the motor, a transmission gear is inserted through a bearing at a position corresponding to the drive gear on the left side inside the installation cylinder, a snap ring is sleeved on the lower side of the outside of the installation cylinder, and an assembly ring frame is inserted inside the snap ring;

[0012] Tooth ring, installed at the top end of the assembly ring frame, an installation ring is connected to the outside of the tooth ring, and a pressure sensor is inserted inside the installation ring.

[0013] Preferably, installation ears are circumferentially installed in the upper part of the inner cavity of the embedded cylinder, and bolts are screwed at positions corresponding to the installation ears inside the end cover, which facilitates the disassembly, installation and fixation of the end cover and is convenient for overhauling the components inside the embedded cylinder.

[0014] Preferably, the number of the measurement through grooves is 4 - 6 groups, a hand wheel is installed at the top end of the lead screw, which facilitates the rotation of the lead screw, and the bottom end of the lead screw is connected to the inner ring of the ball bearing, so that the flange and the installation cylinder will not rotate together when the lead screw rotates.

[0015] Preferably, the transmission gear meshes with the drive gear and the tooth ring, the number of the installation rings is 2 - 6 groups, and the detection ends of the pressure sensors are all arranged towards the measurement through grooves, which facilitates the detection.

[0016] Preferably, a bracket is connected to the bottom of the inner cavity of the installation cylinder, the number of the brackets is 3 - 6 groups, and temperature sensors are installed at the inner ends of the brackets, which can monitor the temperature inside the embedded cylinder and improve the diversity of test data.

[0017] (III) Beneficial effects

[0018] Compared with the prior art, the utility model provides a direct-buried in-situ test device for frost heaving force of frozen soil, which has the following beneficial effects:

[0019] This in-situ test device for frost heaving force of directly buried frozen soil drives the rotation of the driving gear through a motor, so that the rotation of the toothed ring can be driven through the transmission gear, enabling the circumferential angle of the adjustable mounting ring and the pressure sensor to be adjusted. At the same time, the up and down movement of the flange and the mounting cylinder can be driven by rotating the lead screw, enabling the up and down vertical positions of the pressure sensor and the temperature sensor to be adjusted. Furthermore, through multi-directional movement, the pressure sensor can capture the changes in frost heaving force at different depths and angles, which helps to obtain more comprehensive and accurate data. And the dynamic characteristics of the pressure sensor can ensure effective measurement at different stages and different stress states of the frozen soil, improving the representativeness and reliability of the data. Also, during the frost heaving process of the frozen soil, the stress distribution may be uneven, and the flexible movement of the sensor can help reduce the test errors caused by fixed positions. And through the transmission between the transmission gear, the driving gear and the toothed ring, compared with directly rotating through the motor, it prevents the pressure and thrust generated by the frost heaving force from directly acting on the rotor of the motor, ensuring the safety and stability of the device operation. Description of the Drawings

[0020] Figure 1 is a schematic structural diagram of the present utility model;

[0021] Figure 2 is a schematic structural diagram of the end cover and bolts assembly of the present utility model;

[0022] Figure 3 is a schematic structural diagram of the flange and the mounting cylinder of the present utility model;

[0023] Figure 4 is a schematic cross-sectional view of the mounting cylinder of the present utility model.

[0024] In the figure: 1, embedded cylinder; 2, measurement through slot; 3, end cover; 4, assembly column; 5, lead screw; 6, mounting ear; 7, bolt; 8, ball bearing; 9, flange; 10, mounting cylinder; 11, motor; 12, driving gear; 13, transmission gear; 14, snap ring; 15, assembly ring frame; 16, toothed ring; 17, mounting ring; 18, pressure sensor; 19, bracket; 20, temperature sensor. Detailed Embodiment

[0025] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0026] The utility model provides a technical solution, a direct-buried in-situ test device for frost heaving force of frozen soil, including a pre-buried cylinder 1, a measurement through groove 2, an end cover 3, an assembly column 4, a lead screw 5, a mounting ear 6, a bolt 7, a ball bearing 8, a flange 9, a mounting cylinder 10, a motor 11, a driving gear 12, a transmission gear 13, a snap ring 14, an assembly ring frame 15, a toothed ring 16, a mounting ring 17, a pressure sensor 18, a bracket 19 and a temperature sensor 20:

[0027] Please refer to Figure 1 , the pre-buried cylinder 1, a measurement through groove 2 is circumferentially provided on the outer circumference of the pre-buried cylinder 1, an end cover 3 is installed at the top of the pre-buried cylinder 1, an assembly column 4 is installed in the middle of the upper surface of the end cover 3, and a lead screw 5 is screwed inside the assembly column 4. Please refer to Figure 2 , mounting ears 6 are circumferentially installed in the upper part of the inner cavity of the pre-buried cylinder 1, and bolts 7 are screwed at positions corresponding to the mounting ears 6 inside the end cover 3;

[0028] Please refer to Figure 3 , the ball bearing 8, sleeved at the bottom of the lead screw 5, the bottom end of the ball bearing 8 is welded with a flange 9, and a mounting cylinder 10 is installed at the bottom of the flange 9. Please refer to Figure 4 , a motor 11 is installed at the top of the inner cavity of the mounting cylinder 10, the number of the measurement through grooves 2 is 4-6 groups, a hand wheel is installed at the top end of the lead screw 5, and the bottom end of the lead screw 5 is connected to the inner ring of the ball bearing 8;

[0029] The driving gear 12, coaxially connected to the bottom end of the motor 11, a transmission gear 13 is inserted through a bearing at a position corresponding to the driving gear 12 on the left side inside the mounting cylinder 10, a snap ring 14 is sleeved on the lower side of the outside of the mounting cylinder 10, an assembly ring frame 15 is inserted inside the snap ring 14, the toothed ring 16, installed at the top end of the assembly ring frame 15, and the outside of the toothed ring 16 is connected with a mounting ring 17. Please refer to Figure 3, a pressure sensor 18 is inserted inside the mounting ring 17. The transmission gear 13 meshes with the driving gear 12 and the toothed ring 16. By driving the rotation of the driving gear 12 through the motor 11, the rotation of the toothed ring 16 can be driven through the transmission gear 13, so that the circumferential angle of the mounting ring 17 and the pressure sensor 18 can be adjusted. At the same time, the up and down movement of the flange 9 and the mounting cylinder 10 can be driven by rotating the lead screw 5, so that the up and down vertical positions of the pressure sensor 18 and the temperature sensor 20 can be adjusted. Furthermore, through the multi-directional movement, the pressure sensor 18 can capture the changes in frost heaving force at different depths and angles, which helps to obtain more comprehensive and accurate data. And the dynamic characteristics of the pressure sensor 18 can ensure effective measurement at different stages and different stress states of frozen soil, improving the representativeness and reliability of the data. Also, since the stress distribution may be uneven during the frost heaving process of frozen soil, the flexible movement of the pressure sensor 18 can help reduce the test error caused by the fixed position. And by transmitting power through the transmission gear 13, the driving gear 12 and the toothed ring 16 instead of directly through the motor 11, the pressure and thrust generated by the frost heaving force are prevented from directly acting on the rotor of the motor 11, ensuring the safety and stability of the device operation. Please refer to Figure 4 , the number of the mounting rings 17 is 2 - 6 groups, the detection ends of the pressure sensors 18 all face the measurement through groove 2. A bracket 19 is connected to the bottom of the inner cavity of the mounting cylinder 10, the number of the brackets 19 is 3 - 6 groups, and temperature sensors 20 are installed at the inner ends of the brackets 19.

[0030] In this solution, by driving the rotation of the driving gear 12 through the motor 11, the rotation of the toothed ring 16 can be driven through the transmission gear 13, so that the circumferential angle of the mounting ring 17 and the pressure sensor 18 can be adjusted. At the same time, the up and down movement of the flange 9 and the mounting cylinder 10 can be driven by rotating the lead screw 5, so that the up and down vertical positions of the pressure sensor 18 and the temperature sensor 20 can be adjusted. Furthermore, through the multi-directional movement, the pressure sensor 18 can capture the changes in frost heaving force at different depths and angles, which helps to obtain more comprehensive and accurate data. And the dynamic characteristics of the pressure sensor 18 can ensure effective measurement at different stages and different stress states of frozen soil, improving the representativeness and reliability of the data. Also, since the stress distribution may be uneven during the frost heaving process of frozen soil, the flexible movement of the pressure sensor 18 can help reduce the test error caused by the fixed position. And by transmitting power through the transmission gear 13, the driving gear 12 and the toothed ring 16 instead of directly through the motor 11, the pressure and thrust generated by the frost heaving force are prevented from directly acting on the rotor of the motor 11, ensuring the safety and stability of the device operation.

[0031] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device.

[0032] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An in-situ test device for frost heaving force of directly buried frozen soil, characterized in that, include: An embedded tube (1), wherein a measuring groove (2) is provided on the outer circumference of the embedded tube (1), an end cover (3) is installed on the top end of the embedded tube (1), an assembly column (4) is installed in the middle of the upper surface of the end cover (3), and a screw rod (5) is screwed inside the assembly column (4); A ball bearing (8) is sleeved on the bottom of the screw rod (5); a flange (9) is welded to the bottom end of the ball bearing (8); a mounting tube (10) is installed at the bottom of the flange (9); and a motor (11) is installed at the top of the inner cavity of the mounting tube (10); A driving gear (12) is coaxially connected to the bottom end of the motor (11); a transmission gear (13) is inserted into the position corresponding to the driving gear (12) on the left side of the interior of the mounting cylinder (10) through a bearing; a snap ring (14) is sleeved on the lower side of the exterior of the mounting cylinder (10); an assembly ring frame (15) is inserted into the interior of the snap ring (14); A gear ring (16) is mounted on the top of the assembly ring frame (15); the outside of the gear ring (16) is connected to a mounting ring (17); and the inside of the mounting ring (17) is plugged with a pressure sensor (18).

2. The in-situ testing device for frost heaving force of directly buried frozen soil according to claim 1, wherein: The upper portion of the inner cavity of the embedded tube (1) is circumferentially provided with mounting ears (6), and bolts (7) are screwed to positions corresponding to the mounting ears (6) inside the end cover (3).

3. The directly buried in-situ frozen soil frost heave force testing device according to claim 1, characterized in that: The number of the measuring slots (2) is 4-6 groups, the top end of the screw rod (5) is equipped with a hand wheel, and the bottom end of the screw rod (5) is connected to the inner ring of the ball bearing (8).

4. The in-situ testing device for frost heaving force of direct-buried frozen soil according to claim 1, wherein: The transmission gear (13) is meshed with the driving gear (12) and the gear ring (16); the number of the mounting rings (17) is 2-6 groups; and the detection ends of the pressure sensors (18) are all arranged toward the measuring slots (2).

5. The in-situ testing device for frost heaving force of directly buried frozen soil according to claim 1, characterized in that: The bottom of the inner cavity of the installation cylinder (10) is connected with a bracket (19), the number of the brackets (19) is 3-6 groups, and the inner ends of the brackets (19) are all installed with temperature sensors (20).

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