CN109932246B - A geosynthetic material top pressure creep test device - Google Patents

Abstract

The utility model discloses a geosynthetic material jacking creep test device which comprises a workbench, a hanging part, a guiding part, a clamp part, a control part and a counterweight part, wherein the workbench is connected with the hanging part; the workbench comprises a base, a lever suspension bracket and a stable cross beam, and plays a role of stabilizing the whole device; the hanging part comprises a lever, a weight frame, a pressing hammer and a lever clamp holder, and can realize the effect of pressing geotechnical cloth after leveling; the guiding part comprises a pressing block, a pressure sensor, a force turning direction device, a directional barrel and a connecting rod, and keeps the force acting on the geosynthetic material in the same vertical direction all the time; the clamp part comprises a clamp cover, a bracket and plum blossom nails and is used for fixing the geosynthetic material; the control part comprises a data acquisition workstation, a displacement sensor, an electromagnetic fixing instrument, a sensor transfer station and an SIS426 digital double-shaft inclination sensor, and is used for data acquisition, processing, storage, output and the like; the counterweight part comprises a water level leveling dish and an intelligent water supply pump, so that the force acting on the geosynthetic material is kept constant.

Description

A geosynthetic material top pressure creep test device

Technical field

The invention relates to the field of geosynthetic material performance testing, specifically a geosynthetic material top pressure creep test device.

Background technique

The study of dynamic creep properties of geosynthetic materials is closely related to construction design and project quality. At present, the experimental equipment for researching the creep properties of geosynthetic materials only has experimental equipment for testing the creep performance under conventional tensile conditions. There is no experimental equipment for testing the creep performance of geosynthetic materials under top pressure.

Products similar to the present invention mainly include various experimental devices for measuring the creep properties of geosynthetics, which are mainly used for conventional tensile experiments, creep experiments or experiments to test related creep properties. For example, Chinese patent CN107356482A publishes a test The test platform for creep properties of geosynthetic materials can measure the creep mechanical properties of geosynthetic materials in soil. This type of experimental device is used to measure the creep mechanical properties in soil. It is a typical experimental device for measuring the creep properties of geosynthetic materials in a tensile state. However, the use of geosynthetic materials in actual engineering is not simple. Limited to applications in the tensile state, the current experimental device cannot test the creep characteristics of geosynthetic materials with different jacking blocks under jacking conditions. Therefore, the application of an experimental device that can measure creep characteristics under top pressure will bring new developments to the research of geosynthetic materials.

In view of the currently existing experimental devices that can only measure creep properties under conventional tensile conditions, this utility model can realize experimental research on the creep properties of geosynthetic materials under top pressure. It breaks through the functions of the existing devices that are rarely discussed. The utility model is used to work with various devices to ensure that various indicators (such as the size of the force, the direction of the force, etc.) remain stable during the experiment, so that The experimental data is more accurate, greatly reducing the occurrence of errors, and there is no need to connect to a socket during the experiment, which ensures that functions such as data recording, data transmission, and data storage can still be achieved in the event of a power outage.

Contents of the invention

The purpose of the present invention is to overcome the shortcomings of the existing technology and provide a geosynthetic material top pressure creep test device, which can study the complex action mechanism of geosynthetic materials under different top pressure states, is easy to use, and has accurate measurement. Long-term creep performance experimental tests can be completed without plugging in the power supply.

The technical solution to achieve the purpose of the present invention is:

A geosynthetic material top pressure creep test device, including a workbench, a suspension part, a guide part, a clamp part, a control part and a counterweight part;

The workbench includes a base, a lever suspension frame, and a stable beam. The lower ends of the two lever suspension frames are fixed on the base, and the stable beam is fixed on the upper ends of the two lever suspension frames;

The suspension part includes a lever, a weight frame, a pressure hammer, and a lever holder. The lever holder is fixed on the lower surface of the stable beam, the lever is clamped on the lever holder, and the pressure hammer is located at one end of the lever. , the weight is set up at the other end of the lever;

The guide part includes a pressing block, a pressure sensor, a torque direction device, a directional barrel, and a connecting rod; the upper end of the connecting rod is connected to the lever, and the lower end is connected to the upper surface of the steering director; the lower surface of the steering director is connected to the pressure The upper end of the sensor is connected, the lower end of the pressure sensor is connected to the pressure block, and the output line of the pressure sensor is also connected to the control part. The pressure block is located in the directional barrel, and there is a pressure plate below the directional barrel that is integrated with the directional barrel;

The clamp part includes a bracket and a clamp cover. The bracket is located on the base of the workbench. The clamp cover covers the pressure plate under the directional bucket. The pressure plate under the directional bucket is fixed on the bracket through plum-shaped nails;

The control part includes a data acquisition workstation, a sensor transfer station, an electromagnetic fixator, a displacement sensor, and a microelectromechanical gyroscope. The electromagnetic fixator is located on the clamp cover, and the displacement sensor is located on the pressure sensor and is connected to the electromagnetic fixator. The displacement The sensor is connected to the sensor transfer station through a data line. The microelectromechanical gyroscope is installed on the connecting rod of the guide part and connected to the data collection workstation through the data line. The sensor transfer station is connected to the data collection station workstation through the data line. The sensor transfer station passes The data line is also connected to the pressure sensor;

The counterweight part includes a water level leveling dish and an intelligent water supply pump. The horizontal leveling dish is located below the weight rack and is connected to the weight rack. The water level leveling dish is connected to the smart water supply pump through a water pipe. The smart water supply pump is connected to the data via a data line. Collection workstation connection.

In the lever suspension frame, the lower ends of the two lever suspension frames are vertically and symmetrically fixed on the base.

The lever holder is fixed on the lower surface of the center of the stable beam.

The upper surface of the torque director is movably connected to the connecting rod, and the lower surface is provided with a chute. A pulley is provided in the chute, and is connected to the pressure sensor through the pulley. The length of the torque director is greater than 5cm.

The directional barrel has a layer of polytetrafluoroethylene attached inside the barrel.

The bracket is an annular three-legged frame, and the annular center is located directly below the directional bucket cover.

The lever, weight holder, and water level leveling dish are made of carbon fiber.

The microelectromechanical gyroscope is a SIS426 digital dual-axis inclination sensor.

The sensor transfer station is a strain gauge.

The data collection workstation is a computer, and the computer is a desktop computer or a laptop computer.

The invention provides a geosynthetic material top pressure creep test device. The device is provided with a guide part and is assisted by polytetrafluoroethylene, so that stress concentration will not occur during the descent of the top pressure block, thereby making the experimental data more accurate. Accurate; at the same time, a counterweight part is added to ensure that the force remains constant during the experiment; this device can measure the creep state of geosynthetic materials under top pressure and is used to study the creep performance indicators of geosynthetic materials under top pressure. Compared with the existing experimental device for measuring creep properties under ordinary tensile conditions, it is a completely new design; it has the following beneficial effects:

1. Reasonable design and accurate measurement. This device adds a measurement system with a rotational force director so that the pressing block will not deflect and stress concentration, thereby making the experimental data more accurate;

2. Use SIS426 digital dual-axis inclination sensor for angle monitoring to ensure that the force acting on the geotextile always maintains the same value, making the measurement data more accurate;

3. It is easy to use and operate, realizes the connection between various sensors and the overall structure, and is connected to the computer system. The test results will be displayed in detail and recorded on the computer working end;

4. During the entire process of testing the creep properties of geosynthetic materials, there is no need for personnel to watch on site and record data. The computer will record and save various measured data according to the recording mode set by the experimenter;

5. Using this device, the entire experimental process can be completed by a small number of people, which not only reduces human resources, but also improves the efficiency of experimental operations;

6. This device is easy to disassemble and move, making the experimental data more accurate. The lever and weight frame are made of carbon fiber material, which meets the high requirements of most experimenters in terms of handling and measurement accuracy;

7. This device solves the problem that other experimental devices cannot be used during power outages. By replacing the computer battery, this device can be used for experiments without plugging in the power supply for a long time.

Description of drawings

Figure 1 is a schematic diagram of the overall structure of a geosynthetic material top pressure creep test device of the present invention;

Figure 2 is a schematic structural diagram of the workbench and suspension part;

Figure 3 is a schematic structural diagram of the guide part;

Figure 4 is a schematic structural diagram of the clamp part;

Figure 5 is a schematic structural diagram of the control part and counterweight part;

Figure 6 shows replaceable pressing heads of different shapes;

In the picture, 1. Workbench 2. Suspension part 3. Guide part 4. Clamp part 5. Control part 6. Counterweight part 1-1. Base 7. Data cable 1-2. Lever suspension frame 1-3. Stable beam 2-1. Lever 2-2. Weight holder 2-3. Lever holder 2-4. Pressure hammer 3-1. Connecting rod 3-2. Torque direction device 3-3. Pressure sensor 3-4. Top pressure block 3-5. Directional bucket cover 3-6. Pressure plate 4-1. Bracket 4-2. Clamp cover 4-3. Torx nail 5-1. Electromagnetic fixator 5- 2. Displacement sensor 5-3. SIS426 Digital dual-axis inclination sensor 5-4. Sensor transfer station 5-5. Data collection workstation 6-1. Water level leveling dish 6-2. Intelligent water supply pump.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and examples, but the invention is not limited.

As shown in Figure 1, a geosynthetic material top pressure creep test device includes a workbench 1, a suspension part 2, a guide part 3, a clamp part 4, a control part 5 and a counterweight part 6;

As shown in Figure 2, the workbench 1 plays the role of stabilizing the entire device, including a base 1-1, a lever suspension frame 1-2, a stable beam 1-3, and the lower ends of the two lever suspension frames 1-2 are fixed On the base 1-1, the stable beam 1-3 is fixed to the upper ends of the two lever suspension frames 1-2 through bolts and nuts;

As shown in Figure 2, the suspension part 2 can realize the function of compressing the geotextile after leveling, including a lever 2-1, a weight frame 2-2, a pressure hammer 2-4, and a lever holder 2-3 , the lever holder 2-3 is fixed on the lower surface of the stable beam 1-3 through bolts, the lever 2-1 is clamped on the lever holder 2-3 through bolts, and the pressure hammer 2-4 is hung on the lever 2- 1 has one end with spiral pattern, and the weight frame 2-2 is located at the other end of the lever;

As shown in Figure 3, the guide part 3 keeps the force acting on the geosynthetic material in the same vertical direction, including the pressing block 3-4, the pressure sensor 3-3, the rotation force director 3-2, the orientation Bucket 3-5, connecting rod 3-1; the upper end of connecting rod 3-1 is connected to lever 2-1, and the lower end is connected to the upper surface of steering director 3-2; the lower surface of steering director 3-2 is connected to the pressure sensor The upper end of 3-3 is connected, the lower end of the pressure sensor 3-3 is connected to the pressing block 3-4, the output line of the pressure sensor 3-3 is also connected to the control part 5, the pressing block 3-4 is located in the directional barrel 3-4 5, a pressure plate 3-6 is provided below the directional barrel 3-5 and is integrated with the directional barrel 3-5;

As shown in Figure 4, the clamp part 4 plays the role of fixing geosynthetic materials, and includes a bracket 4-1 and a clamping cover 4-2. The bracket 4-1 is located on the base 1-1 of the workbench 1. Cover 4-2 covers the pressure plate 3-6 of the directional barrel 3-5, and fix the pressure plate 3-6 under the directional barrel 3-5 to the bracket 4-1 through the plum blossom nails 4-3. The plum blossom nails 4-3 can Ensure that the pressure plate 3-6 under the directional barrel 3-5 is clamped more tightly;

As shown in Figure 5, the control part 5 is used for data collection, processing, storage, output, etc., including a data collection workstation 5-5, a sensor transfer station 5-4, an electromagnetic fixation device 5-1, and a displacement sensor. 5-2. SIS426 digital dual-axis inclination sensor 5-3, electromagnetic fixation device 5-1 is set on the clamp cover 4-2, and displacement sensor 5-2 is set on the pressure sensor 3-3 and connected to the electromagnetic fixation device 5-1 , the displacement sensor 5-2 is connected to the sensor transfer station 5-4 through the VGA data line 7, and transmits the data to the sensor transfer station 5-5; the SIS426 digital dual-axis inclination sensor 5-3 is located on the connecting rod of the guide part 3 3-1 is directly connected to the data acquisition workstation 5-5 through the VGA data cable 7, the sensor transfer station 5-4 is connected to the data acquisition station workstation 5-5 through the data cable, and the sensor transfer station 5-4 is connected to the data acquisition station 5-5 through the VGA data cable 7 It is also connected to the pressure sensor 3-3; the data collection station workstation 5-5 is responsible for analyzing, processing, saving and outputting data;

As shown in Figure 5, the counterweight part 6 keeps the force of the geosynthetic material constant and includes a water level leveling dish 6-1 and an intelligent water supply pump 6-2. The horizontal leveling dish 6-1 is located on the weight frame 2- 2 is connected to the weight rack 2-2, the water level leveling dish 6-1 is connected to the intelligent water supply pump 6-2 through a water pipe, the intelligent water supply pump 6-2 is connected to the data acquisition workstation 5-5 through the VGA data cable 7, and the data The acquisition workstation 5-5 calculates the amount of water required to maintain pressure balance through the real-time angle measured by the SIS426 digital dual-axis inclination sensor 5-3, and sends a set of commands to the intelligent water supply pump 6-2, and the intelligent water supply pump 6-2 ejects A certain amount of water is added to the water level to level the pan 6-1 to ensure that the top pressure on the geosynthetic material remains at a constant value during the experiment.

The lower ends of the two lever suspension racks 1-2 are vertically and symmetrically fixed on the base 1-1.

The lever holder 2-3 is fixed on the lower surface of the center of the stable beam 1-3.

The upper surface of the torque director 3-2 is movably connected to the connecting rod 3-1, and the lower surface is provided with a chute. A pulley is provided in the chute. The pulley is connected to the pressure sensor 3-3 to reduce the pressure sensor. The friction between 3-3 and the torque director 3-2, the length of the torque director 3-2 is greater than 5cm.

The directional barrel 3-4 has a layer of polytetrafluoroethylene attached inside the barrel, so that the pressure block 3-4 will not produce stress concentration during the descent process, thereby making the experimental data more accurate.

The bracket 4-1 is an annular three-legged bracket, which plays a role in fixing and stabilizing the clamping cover. The annular center is located directly below the pressing block 3-4.

The lever 2-1, the weight frame 2-2, and the water level leveling dish 6-1 are made of carbon fiber material, so that their mass is negligible.

The pressing blocks 3-4 can be replaced with different shapes of pressing heads as shown in Figure 6.

The sensor transfer station 5-4 is a strain gauge, used for dynamic strain measurement of any deformation of the structure. Example 1

The data collection workstation 5-5 is a computer. The computer is a desktop or a notebook. A notebook computer with sufficient power supply is used to complete the experiment under the condition of power outage. The computer is installed with the Youtai software driver corresponding to the strain gauge, and the smart computer is installed. The water supply pump software driver corresponds to the intelligent water supply pump, and the installed SIS426 software driver corresponds to the SIS426 digital dual-axis inclination sensor.

The test methods for this device are:

Example 1

1. The test method for measuring the top pressure creep performance of CBR geosynthetic materials using the above device includes the following steps:

1-1) Leveling lever

Before the experiment, use a lever leveler to level the lever. Place the lever leveler on the lever and adjust the position of the hammer so that the small water droplet of the lever leveler is in the middle of the leveler to level the lever;

1-2) Fixation of geosynthetic materials

The geosynthetic material is tightened and placed under the pressure plate of the directional bucket. The clamping cover is covered on the pressure plate of the directional bucket. The geosynthetic material and the pressure plate are fixed on the bracket through plum blossom nails. The plum blossom nails can ensure that the directional bucket cover is clamped securely. tighter;

1-3) Adjust the position of the clamp part

Adjust the position of the clamp part so that the mouth of the directional barrel cover is directly below the pressing block, which can ensure that the pressing block just enters the directional barrel cover during the pressing process;

1-4) Data settings

Use the installed software in the computer to set the units, measurement gaps, calculation formulas, etc. of the data measured by each sensor in the software, and start the experiment;

1-5) Add weights

Calculate the weight according to the experimental requirements and carefully place the weight in the center of the weight rack. At this time, ensure that the fixed workbench does not tip sideways;

1-6) Pressure maintenance

During the downward movement of the jacking block, due to the deflection of the connecting rod, the force in the vertical direction of the connecting rod decreases. The reduced force is analyzed by the computer and a certain amount of water is sprayed out by the intelligent water supply pump to balance it. The pressure remained consistent throughout the experiment.

1-7) Test results

According to the time required for the experiment, the computer has been recording various data of the geosynthetic material during the top pressure creep process;

1-8) Test completed

Remove the weights, remove the creeping geosynthetics, clean the experimental device, and prepare for the next set of experiments.

Example 2

2. The test method for measuring the puncture strength of geosynthetic materials using the above device includes the following steps:

2-1) Leveling lever

Before the experiment, use a lever leveler to level the lever. Place the lever leveler on the lever and adjust the position of the hammer so that the small water droplet of the lever leveler is in the middle of the leveler to level the lever;

2-2) Fixation of geosynthetic materials

The geosynthetic material is tightened and placed under the directional bucket cover, and the clamping cover is placed on the directional bucket cover. The geosynthetic material and the directional bucket cover are fixed on the bracket through plum blossom nails. The plum blossom nails can ensure that the directional bucket cover is clamped. tighter;

2-3) Adjust the position of the clamp part

Adjust the position of the clamp part so that the mouth of the directional barrel cover is directly below the pressing block, which can ensure that the pressing block just enters the directional barrel cover during the pressing process;

2-4) Data settings

Use the installed software in the computer to set the units, measurement gaps, calculation formulas, etc. of the data measured by each sensor in the software, and start the experiment;

2-5) Add weights

Calculate the weight according to the experimental requirements and carefully place the weight in the center of the weight holder. At this time, ensure that the fixed workbench does not tip sideways;

2-6) Pressure maintenance

During the downward movement of the pressing block, due to the deflection of the connecting rod, the force in the vertical direction of the connecting rod is reduced. The reduced force is analyzed in real time by the computer, and a certain amount of water is sprayed out through the intelligent water supply pump. The equilibrium pressure remained consistent throughout the experiment.

2-7) Test results

According to the time required for the experiment, the computer has been recording various data of the geosynthetic material during the puncture strength test process;

2-8) Test completed

Remove the weight, remove the punctured geosynthetic material, clean the experimental device, and prepare for the next set of experiments.

Claims (6)

1. The geosynthetic material jacking creep test device is characterized by comprising a workbench, a hanging part, a guiding part, a clamp part, a control part and a counterweight part;

the workbench comprises a base, lever hanging frames and a stable cross beam, wherein the lower ends of the two lever hanging frames are fixed on the base, and the stable cross beam is fixed at the upper ends of the two lever hanging frames;

the hanging part comprises a lever, a weight frame, a pressing hammer and a lever clamp holder, wherein the lever clamp holder is fixed on the lower surface of the stable cross beam, the lever is clamped on the lever clamp holder, the pressing hammer is arranged at one end of the lever, and the weight frame is arranged at the other end of the lever;

the guide part comprises a pressing block, a pressure sensor, a force turning direction device, a directional barrel and a connecting rod; the upper end of the connecting rod is connected with the lever, and the lower end of the connecting rod is connected with the upper surface of the steering direction device; the lower surface of the steering gear is connected with the upper end of the pressure sensor, the lower end of the pressure sensor is connected with the pressing block, the output line of the pressure sensor is also connected with the control part, the pressing block is arranged in the orientation barrel, and the pressing plate is arranged below the orientation barrel and is connected with the orientation barrel into a whole;

the clamp part comprises a bracket and a clamp cover, the bracket is arranged on a base of the workbench, the clamp cover is covered on a pressing plate under the orientation barrel, and the pressing plate under the orientation barrel is fixed on the bracket through plum blossom nails;

the control part comprises a data acquisition workstation, a sensor transfer station, an electromagnetic fixing instrument, a displacement sensor and a micro-electromechanical gyroscope, wherein the electromagnetic fixing instrument is arranged on the clamping cover, the displacement sensor is arranged on the pressure sensor and is connected with the electromagnetic fixing instrument, the displacement sensor is connected with the sensor transfer station through a data line, the micro-electromechanical gyroscope is arranged on a connecting rod of the guide part and is connected with the data acquisition workstation through a data line, the sensor transfer station is connected with the data acquisition workstation through the data line, and the sensor transfer station is also connected with the pressure sensor through the data line;

the counterweight part comprises a water level leveling dish and an intelligent water supply pump, wherein the water level leveling dish is arranged below the weight frame and is connected with the weight frame, the water level leveling dish is connected with the intelligent water supply pump through a water pipe, and the intelligent water supply pump is connected with the data acquisition workstation through a data line;

the lower ends of the two lever hanging frames are vertically and symmetrically fixed on the base;

the lever clamp holder is fixed on the lower surface of the center of the stable cross beam;

the upper surface of the force turning direction device is movably connected with the connecting rod, the lower surface of the force turning direction device is provided with a chute, a pulley is arranged in the chute, the force turning direction device is connected with the pressure sensor through the pulley, and the length of the force turning direction device is more than 5cm.

2. The geosynthetic material top pressure creep test apparatus of claim 1 wherein the directional bucket has a layer of polytetrafluoroethylene attached to the interior of the bucket.

3. The geosynthetic material top pressure creep test apparatus of claim 1 wherein the support is a three leg support having an annular shape with an annular center positioned directly below the directional bucket cover.

4. The geosynthetic material top pressure creep test apparatus of claim 1 wherein the lever, weight rack, and water level plate are made of carbon fiber.

5. The geosynthetic material top pressure creep test apparatus of claim 1 wherein the microelectromechanical gyroscope is a SIS426 digital biaxial tilt sensor.

6. The geosynthetic material top pressure creep test apparatus of claim 1 wherein the sensor docking station is a strain gauge.