CN109932246B - Geosynthetic material roof pressure creep test device - Google Patents

Geosynthetic material roof pressure creep test device Download PDF

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CN109932246B
CN109932246B CN201910323732.7A CN201910323732A CN109932246B CN 109932246 B CN109932246 B CN 109932246B CN 201910323732 A CN201910323732 A CN 201910323732A CN 109932246 B CN109932246 B CN 109932246B
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lever
sensor
geosynthetic material
clamp
pressing
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CN109932246A (en
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吴迪
赵阳
吴建建
李晓
李倩
张耀文
程峰
苏春晖
唐咸远
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Guilin University of Electronic Technology
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Guilin University of Electronic Technology
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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

Geosynthetic material roof pressure creep test device
Technical Field
The utility model relates to the field of geosynthetic material performance testing, in particular to a geosynthetic material top pressure creep test device.
Background
The research on the dynamic creep property of the geosynthetic material has a close and indispensible relation with the construction design and engineering quality. At present, only a creep performance test experimental device under a conventional tensile state is used for researching and testing the creep performance of the geosynthetic material, and no experimental device for testing the creep performance of the geosynthetic material under a jacking state exists.
Products similar to the utility model mainly have various experimental devices for measuring the creep properties of the geosynthetic material, and are mainly used for conventional tensile experiments, creep experiments or experiments for testing related creep properties, for example, chinese patent CN107356482A discloses a test platform for testing the creep properties of the geosynthetic material, and can measure the creep mechanical properties of the geosynthetic material in soil. The test device realizes the condition of measuring the creep mechanical property, namely the test device is used for measuring the creep property of the geosynthetic material in the soil under a typical stretching state, but the use of the geosynthetic material in the practical engineering is not limited to the application under the stretching state, and the current test device can not test the creep property of different pressure blocks on the geosynthetic material under the pressure condition. Therefore, the application of an experimental device capable of measuring the creep characteristics under the top pressure state can bring about brand new development for the research of geosynthetic materials.
Aiming at the existing experimental device which can only measure the creep performance under the conventional tensile state, the utility model can realize the creep performance experimental study of the geosynthetic material under the top pressure state. The utility model breaks through the functions of the existing fresh and popular devices, ensures that various indexes (such as the force, the direction of force and the like) in the experimental process are kept at a stable degree by the cooperation processing work of various devices, ensures that experimental data are more accurate, greatly reduces error generation, does not need a connecting socket in the experimental process, and can still realize the functions of data recording, data transmission, data storage and the like under the condition of power failure.
Disclosure of Invention
The utility model aims to overcome the defects of the prior art, and provides a geosynthetic material jacking creep test device which can study complex action mechanisms of geosynthetic materials in different jacking states, is convenient to use and accurate in measurement, and can complete long-time creep performance experiment tests without power supply insertion.
The technical scheme for realizing the aim of the utility model is as follows:
a geosynthetic material jacking creep test device comprises a workbench, a suspension part, a guide 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.
The directional barrel is internally attached with a layer of polytetrafluoroethylene.
The support is an annular three-leg support, and the annular center is positioned right below the directional barrel cover.
The lever, the weight rack and the water level leveling dish are made of carbon fiber materials.
The micro electromechanical gyroscope is an SIS426 digital double-shaft inclination angle sensor.
The sensor rotating station is a strain gauge.
The data acquisition workstation is a computer, and the computer is a desktop computer or a notebook computer.
According to the geosynthetic material jacking creep test device provided by the utility model, the guiding part is arranged and is assisted by polytetrafluoroethylene, so that stress concentration can not be generated in the descending process of the jacking block, and experimental data are more accurate; meanwhile, a counterweight part is added, so that the force is always kept constant in the experiment; the device can determine the creep state of the geosynthetic material in the jacking state, is used for researching the creep performance index of the geosynthetic material in the jacking state, and is a brand new design compared with the existing experimental device for determining the creep performance in the common tensile state; the method has the following advantages:
1. the device has reasonable design and accurate measurement, and the measuring system of the force turning direction device is added to ensure that the pressing block cannot deviate and concentrate stress, so that experimental data is more accurate;
2. an SIS426 digital double-shaft inclination sensor is adopted for angle monitoring so as to ensure that the force acting on geotechnical cloth always keeps the same value, so that the measurement data is more accurate;
3. the device is convenient to use and easy to operate, realizes the connection of various sensors and the whole structure, is connected with a computer system, and can display and record test results in detail at a working end of the computer;
4. in the whole process of testing the creep property of the geosynthetic material, personnel are not required to watch on site, record data and other operations, and a computer end can record and store various measured data according to a recording mode set by an experimenter;
5. by using the device, the whole experiment process can be completed by a small number of people, so that the manpower resources are reduced, and the experiment operation efficiency is improved;
6. the device is simple and convenient to detach and convenient to move, experimental data are more accurate, the lever and the weight rack are made of carbon fiber materials, and high requirements of most experimenters on carrying and measuring accuracy are met;
7. the device solves the problem that other experimental devices cannot be used under the condition of power failure, and can be used for testing for a long time under the condition of not plugging in a meter power supply by replacing a battery of a computer.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a geosynthetic material roof pressure creep test apparatus according to the present utility model;
FIG. 2 is a schematic view of the structure of the table and the hanging portion;
fig. 3 is a schematic structural view of the guide portion;
FIG. 4 is a schematic structural view of a clamp portion;
FIG. 5 is a schematic view of the structure of the control section and the counterweight section;
FIG. 6 is a differently shaped replaceable roof head;
in the figure, a workbench 2, a hanging part 3, a guide part 4, a clamp part 5, a control part 6, a counterweight part 1-1, a base 7, a data wire 1-2, a lever hanging bracket 1-3, a stable cross beam 2-1, a lever 2-2, a weight frame 2-3, a lever clamp holder 2-4, a pressure hammer 3-1, a connecting rod 3-2, a force turning direction device 3-3, a pressure sensor 3-4, a top pressing block 3-5, an orientation barrel cover 3-6, a pressing plate 4-1, a bracket 4-2, a clamping cover 4-3, a plum bolt 5-1, an electromagnetic fixing instrument 5-2, a displacement sensor 5-3, an SIS426 digital double-shaft inclination sensor 5-4, a sensor rotating station 5-5, a data acquisition work station 6-1, a water level leveling dish 6-2 and an intelligent water supply pump.
Detailed Description
The utility model is further illustrated, but not limited, by the following figures and examples.
As shown in fig. 1, a geosynthetic material top pressure creep test apparatus includes a table 1, a suspension portion 2, a guide portion 3, a clamp portion 4, a control portion 5, and a weight portion 6;
as shown in FIG. 2, the workbench 1 plays a role of a stabilizing device as a whole and comprises a base 1-1, lever hanging frames 1-2 and a stable cross beam 1-3, wherein the lower ends of the two lever hanging frames 1-2 are fixed on the base 1-1, and the stable cross beam 1-3 is fixed at the upper ends of the two lever hanging frames 1-2 through bolts and nuts;
as shown in fig. 2, the hanging part 2 can realize the function of pressing geotechnical cloth after leveling, and comprises a lever 2-1, a weight frame 2-2, a pressing hammer 2-4 and a lever clamp 2-3, wherein the lever clamp 2-3 is fixed on the lower surface of the stable cross beam 1-3 through bolts, the lever 2-1 is clamped on the lever clamp 2-3 through bolts, the pressing hammer 2-4 is hung on one end of the lever 2-1 with spiral threads, and the weight frame 2-2 is arranged on the other end of the lever;
as shown in fig. 3, the guiding part 3 keeps the force acting on the geosynthetic material in the same vertical direction all the time, and comprises a pressing block 3-4, a pressure sensor 3-3, a force turning direction device 3-2, a directional bucket 3-5 and a connecting rod 3-1; the upper end of the connecting rod 3-1 is connected with the lever 2-1, and the lower end is connected with the upper surface of the steering direction device 3-2; the lower surface of the steering gear 3-2 is connected with the upper end of the pressure sensor 3-3, the lower end of the pressure sensor 3-3 is connected with the pressing block 3-4, the output line of the pressure sensor 3-3 is also connected with the control part 5, the pressing block 3-4 is arranged in the directional barrel 3-5, and the pressing plate 3-6 is arranged below the directional barrel 3-5 and is connected with the directional barrel 3-5 into a whole;
as shown in fig. 4, the clamp part 4 plays a role in fixing geosynthetic materials, and comprises a bracket 4-1 and a clamp cover 4-2, wherein the bracket 4-1 is arranged on a base 1-1 of a workbench 1, the clamp cover 4-2 covers a pressing plate 3-6 of an orientation barrel 3-5, the pressing plate 3-6 under the orientation barrel 3-5 is fixed on the bracket 4-1 through a plum blossom nail 4-3, and the plum blossom nail 4-3 can ensure that the pressing plate 3-6 under the orientation barrel 3-5 is clamped more tightly;
as shown in fig. 5, the control part 5 is used for collecting, processing, storing, outputting and the like of data, and comprises a data collecting workstation 5-5, a sensor transfer station 5-4, an electromagnetic fixing instrument 5-1, a displacement sensor 5-2 and an SIS426 digital double-shaft inclination sensor 5-3, wherein the electromagnetic fixing instrument 5-1 is arranged on a clamping cover 4-2, the displacement sensor 5-2 is arranged on a pressure sensor 3-3 and is connected with the electromagnetic fixing instrument 5-1, the displacement sensor 5-2 is connected with the sensor transfer station 5-4 through a VGA data wire 7, and the data is transmitted to the sensor transfer station 5-5; the SIS426 digital double-shaft inclination sensor 5-3 is arranged on a connecting rod 3-1 of the guide part 3 and is directly connected with the data acquisition workstation 5-5 through a VGA data line 7, the sensor transfer station 5-4 is connected with the data acquisition workstation 5-5 through a data line, and the sensor transfer station 5-4 is also connected with the pressure sensor 3-3 through the VGA data line 7; the data acquisition station workstation 5-5 is responsible for analyzing, processing, storing and outputting data;
as shown in FIG. 5, the counterweight part 6 keeps the force of the geosynthetic material constant, and comprises a water level leveling dish 6-1 and an intelligent water supply pump 6-2, wherein the water level leveling dish 6-1 is arranged below the weight frame 2-2 and is connected with the weight frame 2-2, the water level leveling dish 6-1 is connected with the intelligent water supply pump 6-2 through a water pipe, the intelligent water supply pump 6-2 is connected with a data acquisition workstation 5-5 through a VGA data line 7, the data acquisition workstation 5-5 calculates the required water quantity for keeping the pressure balanced through the real-time angle measured by a SIS426 digital double-shaft inclination sensor 5-3, a group of commands are transmitted to the intelligent water supply pump 6-2, and the intelligent water supply pump 6-2 ejects a certain amount of water to the water level leveling dish 6-1, so that the top pressure born by the geosynthetic material in the experimental process is always kept at a constant value.
The lower ends of the two lever hanging frames 1-2 are vertically and symmetrically fixed on the base 1-1.
The lever clamp holder 2-3 is fixed on the lower surface of the center of the stable cross beam 1-3.
The upper surface of the force turning direction device 3-2 is movably connected with the connecting rod 3-1, 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 3-3 through the pulley, friction between the pressure sensor 3-3 and the force turning direction device 3-2 is reduced, and the length of the force turning direction device 3-2 is larger than 5cm.
The directional barrel 3-4 is internally attached with a layer of polytetrafluoroethylene, so that the pressure block 3-4 can not generate stress concentration in the descending process, and experimental data are more accurate.
The support 4-1 is an annular three-leg support, plays a role in fixing and stabilizing the clamping cover, and is positioned right below the pressing block 3-4.
The lever 2-1, the weight rack 2-2 and the water level leveling dish 6-1 are made of carbon fiber materials, so that the mass of the lever is negligible.
The pressing blocks 3-4 can be replaced with pressing blocks with different shapes as shown in figure 6.
The sensor rotating station 5-4 is a strain gauge and is used for dynamically measuring the strain of any deformation of the structure. Example 1
The data acquisition workstation 5-5 is a computer, the computer is a desk type or notebook type computer, the notebook type computer with sufficient power supply is adopted, the experiment can be completed under the condition of power failure, the computer is provided with a Youtai software driver corresponding to the strain gauge, an intelligent water supply pump software driver corresponding to the intelligent water supply pump is provided, and an SIS426 software driver corresponding to the SIS426 digital double-shaft inclination sensor is provided.
The test method of the device comprises the following steps:
example 1
1. The test method for measuring the CBR jacking creep performance of the geosynthetic material by using the device comprises the following steps:
1-1) leveling lever
Before an experiment, a lever leveling instrument is used for leveling a lever, the lever leveling instrument is placed on the lever, and the position of a pressing hammer is adjusted, so that small water drops of the lever leveling instrument are positioned at the middle position of the leveling instrument, and the lever can be leveled;
1-2) immobilization of geosynthetic materials
The geosynthetic material is tensioned and placed below the pressing plate of the orientation barrel, the clamping cover covers the pressing plate of the orientation barrel, the geosynthetic material and the pressing plate are fixed on the bracket through the plum blossom nails, and the plum blossom nails can ensure that the orientation barrel cover is clamped more tightly;
1-3) adjusting the position of the clamp portion
The position of the clamp part is adjusted to ensure that the bung hole of the directional bung is right below the pressing block, so that the pressing block can be ensured to just enter the directional bung in the pressing process;
1-4) data set
Setting a unit of data measured by each sensor, a measurement gap, a calculation formula and the like in the software by using installed software in a computer, and starting a test;
1-5) adding weights
According to the weight of the weight required by the experiment, carefully placing the weight in the center of the weight frame, and ensuring that the fixed workbench cannot fall sideways at the moment;
1-6) pressure maintenance
In the downward moving process of the pressing block, the force on the vertical direction of the connecting rod is reduced due to the deviation of the connecting rod, the reduced force is analyzed by a computer, and a certain amount of water is sprayed out through the intelligent water supply pump to balance the pressure and keep the pressure consistent in the whole experimental process.
1-7) test results
According to the time required by the experiment, the computer always records various data of the geosynthetic material in the jacking creep process;
1-8) completion of the test
And taking down the weight, taking down the creep-processed geosynthetic material, cleaning the experimental device, and preparing the next group of experiments.
Example 2
2. The test method for measuring the puncture strength of the geosynthetic material by using the device comprises the following steps:
2-1) leveling lever
Before an experiment, a lever leveling instrument is used for leveling a lever, the lever leveling instrument is placed on the lever, and the position of a pressing hammer is adjusted, so that small water drops of the lever leveling instrument are positioned at the middle position of the leveling instrument, and the lever can be leveled;
2-2) immobilization of geosynthetic materials
The geosynthetic material is tensioned and placed below the directional bucket cover, the clamping cover covers the directional bucket cover, the geosynthetic material and the directional bucket cover are fixed on the bracket through the plum blossom nails, and the plum blossom nails can ensure that the directional bucket cover is clamped more tightly;
2-3) adjusting the position of the clamp portion
The position of the clamp part is adjusted to ensure that the bung hole of the directional bung is right below the pressing block, so that the pressing block can be ensured to just enter the directional bung in the pressing process;
2-4) data set
Setting a unit of data measured by each sensor, a measurement gap, a calculation formula and the like in the software by using installed software in a computer, and starting a test;
2-5) adding weights
According to the weight of the weight required by the experiment, carefully placing the weight in the center of the weight frame, and ensuring that the fixed workbench cannot fall sideways at the moment;
2-6) pressure maintenance
In the downward moving process of the pressing block, the force on the vertical direction of the connecting rod is reduced due to the deviation of the connecting rod, the reduced force is analyzed in real time by a computer, and a certain amount of water is sprayed out by the intelligent water supply pump to balance the pressure and keep the pressure consistent in the whole experimental process.
2-7) test results
According to the time required by the experiment, the computer always records various data of the geosynthetic material in the puncture strength test process;
2-8) completion of the test
And taking down the weight, taking down the pierced geosynthetic material, cleaning the experimental device, and preparing the next group 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.
CN201910323732.7A 2019-04-22 2019-04-22 Geosynthetic material roof pressure creep test device Active CN109932246B (en)

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CN113049399B (en) * 2021-03-12 2023-11-21 广西科技大学 Multifunctional creep deformation instrument for geosynthetic material and test method thereof
CN114508986B (en) * 2022-02-18 2024-06-25 湖南省计量检测研究院 Lever ratio measuring method of lever-type geosynthetic material thickness gauge

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