Shear test device for vane

Abstract

The utility model discloses a vane shear test device. The vane shear test device comprises a top cover, a shell, a vane shear instrument, a locking device and a flange plate, a screen and a keyboard are embedded in the middle of the top of the top shell, and a screen and keyboard protection device is hinged to the top of the top shell. An external power supply and a data interface are arranged on the shell; the vane shear apparatus comprises a motor, a speed reducer, a torque sensor and a controller, the motor, the speed reducer, the torque sensor and the controller are arranged in the shell, and an output shaft of the motor is inserted into an input shaft hole of the speed reducer; an output shaft of the reducer is connected with one end of a torque sensor, and the other end of the torque sensor is connected with a central rotating shaft; the bottom end of the central rotating shaft is connected with a cross plate head, and a torsion limiter is arranged at the joint of the central rotating shaft and the cross plate head; the central rotating shaft is sleeved with an outer sleeve, the bottom end of the outer sleeve is connected with a pipe shoe, and the cross plate head is contained in the pipe shoe; the locking device comprises a locking outer sleeve and a locking handle.

Description

TECHNICAL FIELD

[0001] The utility model relates to geotechnical engineering investigation and ground treatment technical field, especially relate to a cross board shear test device. BACKGROUND

[0002] Cross board shear test is widely used for determining the shearing strength of saturated soft clay, and is an indispensable in-situ testing method for calculating ground mechanics parameters such as ground bearing capacity, dike stability, soft clay sensitivity and consolidation history. The physical and mechanical properties of soft soil determine that cross board shear test is the most suitable in-situ testing method for determining the undrained shear strength and sensitivity of saturated soft clay.

[0003] In recent years, with the rapid development of China's economy, reclamation engineering, wharf yard engineering and logistics park engineering are increasing, and most of these projects located in coastal, river and lake areas have saturated soft soil with large thickness. Therefore, there is a new demand for how to quickly and accurately determine the undrained shear strength of soft soil and to meet the requirements of building site deformation and bearing capacity of reinforced soft soil foundation.

[0004] At present, the cross board shear test equipment at home and abroad has the following shortcomings: mechanical type uses manual rotation, manual torque application is too fast or uneven, which can lead to incomplete or non-representative data collection, and cannot well reflect the process of soil shear failure. In addition, there are inclination and cross board head bottom affected by gravity and human factors during the test, and the deep soil removal time after the test is long, which affects the test efficiency. The sensor of electric type is arranged at the head of cross board blade, the cable is arranged in the drill pipe on the upper part of cross board blade, and the electric sensor is electrically connected with external equipment through cable. When the soil layer test depth is deep, the cable needs to be frequently introduced into the drill pipe, which is tedious and time-consuming. When using resistance strain gauge sensor, the temperature drift and zero drift problems of the sensing system are difficult to overcome. The probe is used in natural soil filled with underground water, and the waterproof packaging requirement of the sensor is high, and the durability is insufficient. In addition, the multi-core cable is used for signal transmission, and the electromagnetic interference and shielding performance have great influence on data.

[0005] Therefore, in view of the above series of problems, it is urgent to provide a recyclable new cross board shear test device and test method. Utility model content

[0006] The purpose of the present application is to solve the problems of the existing mechanical vane shear tester, which is manually operated, and the manual application of torque is too fast or uneven, resulting in incomplete or non-representative data collection, and the sensor of the electric vane shear tester is arranged at the head of the vane blade, and the cable is arranged in the drill pipe of the vane blade, and the electric sensor is electrically connected with the external equipment through the cable, and when the soil test depth is deep, the cable needs to be frequently threaded into the drill pipe, which is complicated and time-consuming.

[0007] The technical scheme adopted to achieve the purpose of the present application is:

[0008] A vane shear test device, comprising a top cover, a shell, a vane shear tester, a locking device and a flange plate, the flange plate is arranged at the bottom of the locking device.

[0009] The middle position of the top of the top shell is embedded with a screen and a keyboard, and the top of the top shell is hinged with a screen and keyboard protection device; an external power supply and a data interface are arranged on the shell, the external power supply is connected with the electric wire to supply power for the vane shear test device, and the data interface is connected with a storage device to export the test data;

[0010] The vane shear tester comprises a motor, a speed reducer, a torque sensor and a controller, the motor, the speed reducer, the torque sensor and the controller are arranged inside the shell, the output shaft of the motor is inserted into the input shaft hole of the speed reducer; the output shaft of the speed reducer is connected with one end of the torque sensor, the other end of the torque sensor is connected with a center shaft; the bottom end of the center shaft is connected with a vane head, a torque limiter is arranged at the connection between the center shaft and the vane head; an outer sleeve is arranged outside the center shaft, the bottom end of the outer sleeve is connected with a pipe shoe, and the vane head is accommodated in the pipe shoe; the motor, the speed reducer and the torque sensor are connected with the controller through a circuit;

[0011] The locking device comprises a locking outer sleeve and a locking handle, the locking handle is arranged at equal intervals in the circumferential direction outside the locking outer sleeve; the locking outer sleeve is sleeved outside the outer sleeve.

[0012] In the above technical scheme, the material of the shell is iron or high-strength plastic.

[0013] In the above technical scheme, the motor adopts a low-speed large-torque servo motor, the speed reducer adopts a turbine speed reducer, and the torque sensor adopts a dynamic high-precision torque sensor.

[0014] In the above technical scheme, the controller comprises a data receiving module, a data processing module and a data sending module, is used for receiving the instruction transmitted by the keyboard and transmitting the instruction to the motor and the speed reducer, and sending the data of the torque sensor received to the screen for display.

[0015] In the above technical scheme, the controller further comprises a Bluetooth module, the Bluetooth module can be connected with the smart phone, receives the instruction of the smart phone and controls the motor and the speed reducer according to the instruction, and sends the data of the torque sensor received to the smart phone through the Bluetooth module.

[0016] The beneficial effects of the utility model are as follows:

[0017] 1, the utility model discloses a motor as the power of the cross plate shear instrument, and the torque is steadily continuous, overcomes the traditional cross plate shear instrument to adopt manpower hand shake, and the manual torque is too fast or the force application speed is uneven, and the data acquisition is not complete or not representative.

[0018] 2, the utility model discloses a high-precision torque sensor as the data acquisition module, and the data acquisition is accurate and rapid, and the torque sensor is arranged in the cross plate shear instrument, and the frequent cable threading in the drill rod is overcome, and the operation is complicated, and the time and labor are saved.

[0019] 3, the utility model discloses a Bluetooth module and smart phone are connected, can operate the cross plate shear instrument in the mobile phone end, and the analysis data are shown, and the intelligentization and automation of the cross plate shear test are realized. DRAWINGS

[0020] In order to more clearly illustrate the technical scheme in the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are only some embodiments of the application, and those skilled in the art can obtain other drawings according to the drawings without paying creative labor.

[0021] Figure 1 It is a spatial structure schematic view of the cross plate shear test device of the utility model.

[0022] Figure 2 It is a cross-sectional view of the cross plate shear test device of the utility model.

[0023] Figure 3 It is a top cover schematic view of the utility model.

[0024] Figure 4 It is a cross-sectional view of the outer sleeve, the pipe shoe, the center rotating shaft and the cross plate head of the utility model.

[0025] In the figure: 1 - top cover, 2 - motor, 3 - reducer, 4 - torque sensor, 5 - housing, 6 - controller, 7 - locking device, 8 - locking handle, 9 - flange, 10 - screen and keyboard, 11 - screen and keyboard protection device, 12 - crosshead, 13 - torque limiter, 14 - central rotating shaft, 15 - outer sleeve, 16 - pipe shoe, 17 - external power supply, 18 - locking outer sleeve. DETAILED DESCRIPTION

[0026] In order to make the person in the art better understand the technical scheme of the present application, the technical scheme of the present application will be further described in combination with specific embodiments.

[0027] Embodiment 1

[0028] A cross shear test device, referring to Figure 1 , Figure 2 , comprising: a top cover 1, a housing 5, a cross shear tester, a locking device 7 and a flange 9, the flange 9 is arranged at the bottom of the locking device 7, connected with the flange of the drilling casing locking device through bolts, realizing the fixed connection of the cross shear test device and the drilling casing.

[0029] The middle position of the top of the top shell 1 is embedded with a screen and keyboard 10, and the top of the top shell 1 is hinged with a screen and keyboard protection device 11. When the screen and keyboard 10 is not used, the screen and keyboard protection device 11 is in a closed state, which is used to protect the screen and keyboard 10. When the screen and keyboard 10 is used, the screen and keyboard protection device 11 is in an open state, which is convenient for the operator to realize the on-off of the cross shear test device, adjust the speed of the cross shear soil body and start and end the test through the operation of the keyboard. The material of the housing 5 is iron or high-strength plastic.

[0030] The vane shear apparatus comprises a motor 2 (the motor 2 adopts a low-speed large-torque servo motor), a speed reducer 3 (the speed reducer 3 adopts a turbine speed reducer), a torque sensor 4 (the torque sensor 4 adopts a dynamic high-precision torque sensor) and a controller 6, the motor 2, the speed reducer 3, the torque sensor 4 and the controller 6 are arranged inside a shell 5, the output shaft of the motor 2 is inserted into the input shaft hole of the speed reducer 3, and the motor 2 outputs power and is adjusted to a pre-set (in accordance with test requirements) rotating speed through the speed reducer 3; the output shaft of the speed reducer 3 is connected with one end of the torque sensor 4 through a key, and the other end of the torque sensor 4 is connected with a central rotating shaft 14, wherein the other end of the torque sensor 4 is connected with the central rotating shaft 14 through a key, for transmitting the torque generated by the rotation of the motor 2 to the central rotating shaft 14, and measuring the moment of the central rotating shaft 14 in real time through the torque sensor 4; the bottom end of the central rotating shaft 14 is connected with a vane head 12, and a moment limiter 13 is arranged at the connection between the central rotating shaft 14 and the vane head 12, the moment of the moment limiter 13 is adjusted by a moment spring to limit the moment, and when the moment transmitted by the central rotating shaft 14 to the vane head 12 exceeds the moment set by the moment limiter 13, the connection between the vane head 12 and the central rotating shaft 14 is immediately disabled to protect the blades of the vane head 12; an outer sleeve 15 is arranged outside the central rotating shaft 14, and a pipe shoe 16 (which is circular) is connected to the bottom end of the outer sleeve 15, the vane head 12 is received in the pipe shoe 16, and when the vane head 12 is inserted into the soil body, the pipe shoe 16 can avoid the vane head 12 from directly contacting with hard objects (such as stones or hard soil layers), thereby reducing the risk of damage.

[0031] The motor 2, the speed reducer 3 and the torque sensor 4 are connected with the controller 6 through lines, the controller 6 comprises a data receiving, processing and sending module, for receiving the instructions transmitted by a keyboard and transmitting the instructions to the motor 2 and the speed reducer 3, and sending the data received by the torque sensor 4 to a screen for display.

[0032] The locking device 7 comprises a locking outer sleeve 18 and locking handles 8, the locking handles 8 are arranged at equal intervals in the circumferential direction outside the locking outer sleeve 18, and the number of the locking handles 8 is set according to experimental requirements; the locking outer sleeve 18 is arranged outside the outer sleeve 15, and the outer sleeve 15 is locked by rotating the locking handles 7.

[0033] Further, an external power supply 17 and a data interface are arranged on the shell 5, the external power supply 17 supplies power to the vane shear test device by being connected with wires, and the data interface is connected with a storage device to export test data.

[0034] A vane shear test method, comprising the following steps:

[0035] Step 1, drill a hole at the test point location according to the pre-set test depth, lower the center shaft 14 with the outer sleeve 15 and the pipe shoe 16 and the cross plate head 12 to the bottom of the hole, the cross plate head 12 is received in the pipe shoe 16 during the lowering process to prevent the cross plate head 12 and the center shaft 14 from being deformed, after the cross plate head 12 reaches the bottom of the hole, the center shaft 14 is pressed down to make the cross plate head 12 extend out of the pipe shoe 16 and enter the soil body.

[0036] Step 2, install the cross plate shear instrument directly above the center shaft 14, the center shaft 14 is connected with the torque sensor 4, the rotating locking handle 8 is used to lock the outer sleeve 15, then align the flange plate 9 with the flange plate of the drilling sleeve locking device and fix them by bolts.

[0037] Step 3, connect the power cable to the external power source 17 to power the cross plate shear instrument, open the screen and keyboard protection device 11, and turn on the cross plate shear instrument by operating the keyboard.

[0038] Step 4, input the project name, drilling number and test depth through the keyboard, click the start test button, the motor 2 rotates to drive the center shaft 14 to rotate, thereby driving the cross plate head 12 to rotate to start the cross plate shear test, and the speed of the motor 2 is adjusted to the pre-set value through the reducer 3, the cross plate shear test is carried out on the undisturbed soil and the remolded soil respectively, and the sensitivity of the cross plate shear test at this depth is calculated after the test is completed.

[0039] Step 5, during the cross plate shear test, the torque sensor 4 is used to measure the torque of the center shaft 14 in real time, when the torque of the center shaft 14 transmitted to the cross plate head 12 exceeds the torque limit set by the torque limiter 13, the connection between the cross plate head 12 and the center shaft 14 is immediately disabled to protect the blades of the cross plate head 12.

[0040] Step 6, after the cross plate shear test is completed, insert the storage device into the data interface, click export data, select the storage device, and import the test data into the storage device.

[0041] Step 7, loosen the bolts on the flange plate, unscrew the locking handle 8, and remove the connection between the center shaft 14 and the torque sensor 4.

[0042] Step 8, repeat steps 1-7 until the cross plate shear test of all test points is completed.

[0043] Example 2

[0044] On the basis of embodiment 1, the controller 6 further comprises a Bluetooth module, which can be connected with a smart phone, accept instructions of the smart phone and control the motor 2 and the speed reducer 3 according to the instructions, and send the received data of the torque sensor 4 to the smart phone through the Bluetooth module.

[0045] The above merely describes the preferred embodiments of the present application, and it should be noted that, for those skilled in the art, some improvements and refinements can be made without departing from the principles of the present application, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A vane shear test apparatus characterized by, It comprises a top cover, a shell, a vane shear device, a locking device and a flange plate arranged at the bottom of the locking device; A screen and a keyboard are embedded in the middle of the top of the top shell, and a screen and keyboard protection device is hinged to the top of the top shell; an external power supply and a data interface are arranged on the shell, the external power supply is connected with a wire to supply power to the vane shear test device, and the data interface is connected with a storage device to export test data; The vane shear device comprises a motor, a speed reducer, a torque sensor and a controller, which are arranged inside the shell, the output shaft of the motor is inserted into the input shaft hole of the speed reducer, the output shaft of the speed reducer is connected with one end of the torque sensor, the other end of the torque sensor is connected with a center shaft, the bottom end of the center shaft is connected with a vane head, a torque limiter is arranged at the connection between the center shaft and the vane head, an outer sleeve is sleeved outside the center shaft, a pipe shoe is connected to the bottom end of the outer sleeve, and the vane head is accommodated in the pipe shoe; the motor, the speed reducer and the torque sensor are connected with the controller through a circuit; The locking device comprises a locking outer sleeve and a locking handle, the locking handle is arranged at equal intervals in the circumferential direction outside the locking outer sleeve, and the locking outer sleeve is sleeved outside the outer sleeve.

2. The vane shear test apparatus of claim 1, wherein, The shell is made of iron or high-strength plastic.

3. The vane shear test apparatus of claim 1, wherein The motor is a low-speed large-torque servo motor, the speed reducer is a turbine speed reducer, and the torque sensor is a dynamic high-precision torque sensor.

4. The vane shear test apparatus of claim 1, wherein The controller comprises a data receiving, processing and sending module for receiving instructions transmitted by the keyboard and transmitting them to the motor and the speed reducer, and sending the received torque sensor data to the screen for display.

5. The vane shear test apparatus of claim 1, wherein The controller further comprises a Bluetooth module which can be connected with a smart phone, accept instructions from the smart phone and control the motor and the speed reducer according to the instructions, and send the received torque sensor data to the smart phone through the Bluetooth module.

Images