Testing device for geotechnical test

Abstract

The utility model relates to a testing device for geotechnical test, including base, sliding plate, support table, motor and eccentric plate, the base is equipped with the guide post, the sliding plate is equipped with the guide hole, the sliding plate is connected with the guide post through the guide hole in a sliding manner, the support table is vertically installed on the base, the support table can abut against the sliding plate, and the motor is connected with the eccentric plate. The motor is transversely installed on the base, the eccentric plate is eccentrically installed at the output end of the motor, the eccentric plate can rotationally abut against and lift the sliding plate, and the eccentric plate and the supporting table alternately abut against the sliding plate. A soil sample collected in a soil test is placed on the sliding plate, the eccentric plate and the supporting table alternately abut against the sliding plate under periodic rotation of the eccentric plate, the sliding plate continuously lifts and then falls on the supporting table again, and the soil sample on the supporting table is compacted through vibration.

Description

Technical Field

[0001] The utility model relates to the technical field of geotechnical tests, and particularly relates to a test device for geotechnical tests. Background Art

[0002] Geotechnical tests are used to determine the physical, mechanical, chemical and other engineering properties of soil for use in geotechnical engineering design and construction control. The indoor tests of geotechnical tests include relative density tests, which are used to measure the minimum and maximum unit weights of cohesionless soil in the loosest and densest states to calculate its maximum and minimum void ratios and relative density, providing important references for engineering design and construction. The most commonly used method for measuring the unit weight of soil samples is the vibration method. The vibration method usually uses a vibrator, but its vibration force is insufficient, making it difficult to test the unit weight of the collected soil samples in the limit state and unable to provide limit data as a reference for engineering design and construction control. Summary of the Utility Model

[0003] To solve the above technical problems, the utility model provides a test device for geotechnical tests, which can compact soil samples with high strength to obtain the unit weight data of soil samples in the limit state.

[0004] The technical solution of the utility model is as follows: A test device for geotechnical tests includes a base, a sliding plate, a support platform, a motor and an eccentric plate. The base is provided with guide columns, and the sliding plate is provided with guide holes. The sliding plate is slidably connected to the guide columns through the guide holes. The support platform is vertically installed on the base and can abut against the sliding plate. The motor is horizontally installed on the base, and the eccentric plate is eccentrically installed at the output end of the motor. The eccentric plate can rotate and abut against and lift the sliding plate, and the eccentric plate and the support platform alternately abut against the sliding plate.

[0005] Further, the arc surface of the eccentric plate is a variable-diameter arc surface, and there is a drop between the starting point and the ending point of the variable-diameter arc surface.

[0006] Further, a roller group is provided at the bottom of the sliding plate, and the eccentric plate can rotate and abut against the roller group.

[0007] Further, the support platform is threadedly connected to the base.

[0008] Further, a first nut is threadedly connected to the support platform, and the first nut abuts against the base.

[0009] Further, a bracket is provided on the base, and the motor is installed on the bracket.

[0010] Further, a circular frame is provided at the upper end of the sliding plate, and the circular frame is provided with internal threads.

[0011] Further, a second nut is provided on the guiding column. The second nut is located above the sliding plate. A spring is sleeved on the guiding column and is located between the second nut and the sliding plate.

[0012] Further, a sleeve is provided on the base, and the guiding column is installed in the sleeve.

[0013] Further, a control panel is provided on the side of the base, and the control panel is electrically connected to the motor.

[0014] Compared with the prior art, the advantages of the present utility model are as follows: The soil sample collected for the geotechnical test is placed on the sliding plate. Driven by the motor, the eccentric plate can rotate to abut against and lift the sliding plate. When the sliding plate is lifted, the sliding plate located on the support platform is lifted by the eccentric plate. As the eccentric plate rotates, the sliding plate is supported by the support platform again. When the sliding plate touches the support platform, vibration is generated, and the vibration is transmitted to the soil sample at the upper end of the sliding plate; under the periodic rotation of the eccentric plate, the eccentric plate and the support platform alternately abut against the sliding plate, causing the sliding plate to continuously lift and then fall back onto the support platform again, compacting the soil sample on the support platform. Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0016] Figure 1 is a structural schematic diagram of the present utility model;

[0017] Figure 2 is a working principle diagram of the present utility model.

[0018] Wherein: 1. Base; 2. Sliding plate; 201. Guide hole; 3. Support platform; 4. Motor; 5. Eccentric plate; 6. Circular frame; 601. Internal thread; 7. Second nut; 8. Spring; 9. Guiding column; 10. Sleeve; 11. Bracket; 12. First nut; 13. Roller group; 14. Control panel. Detailed Embodiments

[0019] To further elaborate on the technical means and effects adopted by the present utility model to achieve the predetermined invention purpose, the following, in combination with the drawings and preferred embodiments, details the specific embodiments, structures, features, and effects of the present utility model as follows.

[0020] As Figure 1-2As shown in the figure, a testing device for geotechnical tests includes a base 1, a sliding plate 2, a support platform 3, a motor 4, and an eccentric plate 5. A guide post 9 is provided on the base 1, and a guide hole 201 is provided on the sliding plate 2. The sliding plate 2 is slidably connected to the guide post 9 through the guide hole 201. The soil sample collected for the geotechnical test is placed on the sliding plate 2. The support platform 3 is vertically installed on the base 1. The support platform 3 can abut against the sliding plate 2. The motor 4 is horizontally installed on the base 1. The eccentric plate 5 is eccentrically installed at the output end of the motor 4. Driven by the motor 4, the eccentric plate 5 can rotate to abut against and lift the sliding plate 2. When the sliding plate 2 is lifted, the sliding plate 2 located on the support platform 3 is lifted by the eccentric plate 5. As the eccentric plate 5 rotates, the sliding plate 2 is supported by the support platform 3 again. When the sliding plate 2 touches the support platform 3, vibration is generated, and the vibration is transmitted to the soil sample at the upper end of the sliding plate 2. Under the periodic rotation of the eccentric plate 5, the eccentric plate 5 and the support platform 3 alternately abut against the sliding plate 2, causing the sliding plate 2 to continuously lift and then fall back onto the support platform 3, compacting the soil sample on the support platform 3.

[0021] In the above embodiment, the arc surface of the eccentric plate 5 is a variable-diameter arc surface. The starting point and the ending point of the variable-diameter arc surface form a section with a drop. After the eccentric plate 5 rotates to lift the sliding plate 2, it loses support at the section and then drops onto the support platform 3, further enhancing the compaction effect on the soil sample. A roller group 13 is provided at the bottom of the sliding plate 2. The eccentric plate 5 can rotate to abut against the roller group 13, making it smoother and with less resistance when the eccentric plate 5 lifts the sliding plate 2. The support platform 3 is threadedly connected to the base 1, and the height of the support platform 3 can be adjusted, thereby adjusting the height difference between the sliding plate 2 and the support platform 3 when the sliding plate 2 loses the support of the eccentric plate 5 and drops onto the support platform 3, and further adjusting the vibration intensity. It can also adjust and avoid the roller group 13 hitting the eccentric plate 5. A first nut 12 is threadedly connected to the support platform 3. The first nut 12 abuts against the base 1, which is used to assist the support platform 3 in bearing force and further fixes the support platform 3. A bracket 11 is provided on the base 1, and the motor 4 is installed on the bracket 11, which is used to raise the motor 4, prevent the eccentric plate 5 from rubbing against the base 1, and also increase the space at the motor 4, facilitating operation and maintenance.

[0022] In the above embodiment, the upper end of the sliding plate 2 is provided with a circular frame 6, and the circular frame 6 is provided with an internal thread 601, which can adapt to the sampling box containing soil, and the sampling box is fixed by the external thread of the sampling box to prevent the sampling box from detaching from the sliding plate 2 or jumping off the circular frame 6 during the vibration process. The guide column 9 is provided with a second nut 7, and the second nut 7 is located above the sliding plate 2. The guide column 9 is sleeved with a spring 8, and the spring 8 is located between the second nut 7 and the sliding plate 2. When the sliding plate 2 is lifted, the spring 8 is compressed and stored. When the sliding plate 2 loses the support of the eccentric plate 5, the sliding plate 2 is accelerated to descend under the release of the elastic force of the spring 8, so that the sliding plate 2 hits the support platform 3 and generates greater vibration, further enhancing the compaction effect on the soil sample. The base 1 is provided with a sleeve 10, and the guide column 9 is installed in the sleeve 10, which is used to assist in fixing the guide column 9 and provide force support for the guide column 9. A control panel 14 is provided on the side of the base 1. The control panel 14 is electrically connected to the motor 4. The motor 4 can be started and stopped through the control panel 14. The control panel 14 also has a counting function, and the motor 4 can stop automatically after a certain number of vibrations.

[0023] Description of the working method of this utility model:

[0024] At the soil sample collection site, the soil sample is collected in a standardized manner using a ring knife and a special circular container. The volume of the soil sample is read and recorded using the scale line of the circular container. The initial bulk density is calculated in combination with the weight of the soil sample. The circular container in which the soil sample is collected is installed into the circular frame 6 of the sliding plate 2 through threads. The test is started after a manual inspection of whether the sliding plate 2 slides smoothly. In the initial state, the sliding plate 2 is supported by the support platform 3. The number of vibrations is set through the control panel 14 and the motor 4 is started. Driven by the motor 4, the eccentric plate 5 rotates counterclockwise and receives the sliding plate 2 on the support platform 3. The sliding plate 2 is then rotated to the left of the support platform 3. The plate 2 is lifted as the eccentric plate 5 rotates, and the spring 8 is compressed at the same time. When the cross-section of the eccentric plate 5 moves to the abutment between the eccentric plate 5 and the roller group 13, the roller group 13 passes over the cross-section of the eccentric plate 5, and the sliding plate 2 loses support and becomes suspended in the air. At the same time, under the release of the elastic force of the spring 8, the sliding plate 2 accelerates downward and hits the support platform 3, generating vibrations for the sliding plate 2 and transmitting them to the soil sample in the circular container, thereby compacting the soil sample. With the continuous rotation of the eccentric plate 5, the sliding plate 2 is periodically lifted and smashed down from the support platform 3, thereby continuously compacting the soil sample in the circular container. In the above test process, the vibration number set by the control panel 14 is 60 times, each vibration corresponds to a rotation cycle of the eccentric plate 5, and 60 vibrations are a test cycle. After each test cycle, the volume of the soil sample is read and recorded on the scale line of the circular container, and the stage bulk density is calculated in combination with the weight of the soil sample to finally obtain the test data; through the test data, the change in bulk density of the soil sample from the most relaxed to the most dense state can be known, the physical and mechanical properties of the soil sample can be judged, and important data reference can be provided for geotechnical engineering design and construction control.

[0025] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A test device for geotechnical testing, comprising a base, a sliding plate, a support table, a motor and an eccentric plate, characterized in that: The base is provided with a guide column, and the sliding plate is provided with a guide hole. The sliding plate is slidably connected to the guide column through the guide hole. The support platform is vertically installed on the base, and the support platform can abut the sliding plate. The motor is horizontally installed on the base, and the eccentric plate is eccentrically installed at the output end of the motor. The eccentric plate can rotate to abut and lift the sliding plate. The eccentric plate and the support platform alternately abut the sliding plate.

2. The test device for geotechnical testing according to claim 1, characterized in that: The arc surface of the eccentric plate is a variable diameter arc surface, and there is a drop between the starting point and the end point of the variable diameter arc surface.

3. The testing device for geotechnical testing according to claim 1, characterized in that: A roller group is arranged at the bottom of the sliding plate, and the eccentric plate can rotatably abut against the roller group.

4. The testing device for geotechnical testing according to claim 1, characterized in that: The support platform is connected to the base through threads.

5. The testing device for geotechnical testing according to claim 4, characterized in that: The support platform is threadedly connected with a first nut, and the first nut abuts against the base.

6. The testing device for geotechnical testing according to claim 1, characterized in that: A bracket is arranged on the base, and the motor is installed on the bracket.

7. The testing device for geotechnical testing according to claim 1, characterized in that: A circular frame is provided on the upper end of the sliding plate, and the circular frame is provided with an internal thread.

8. The testing device for geotechnical testing according to claim 1, characterized in that: The guide column is provided with a second nut, the second nut is located above the sliding plate, the guide column is sleeved with a spring, and the spring is located between the second nut and the sliding plate.

9. The testing device for geotechnical testing according to claim 1, characterized in that: A sleeve is arranged on the base, and the guide column is installed in the sleeve.

10. The testing device for geotechnical testing according to claim 1, characterized in that: A control panel is provided on the side of the base, and the control panel is electrically connected to the motor.

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