CN211453270U - Test block mounting device and measuring device for measuring air permeability of concrete - Google Patents
Test block mounting device and measuring device for measuring air permeability of concrete Download PDFInfo
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- CN211453270U CN211453270U CN201921177818.5U CN201921177818U CN211453270U CN 211453270 U CN211453270 U CN 211453270U CN 201921177818 U CN201921177818 U CN 201921177818U CN 211453270 U CN211453270 U CN 211453270U
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Abstract
The utility model provides a test block mounting device and a measuring device for measuring the air permeability of concrete, wherein the measuring device at least comprises an air compressor, a constant pressure container and a test block mounting device; the test block mounting device comprises an upper cavity and a lower cavity, and the interior of the upper cavity is communicated with the interior of the lower cavity through a test block mounting port; the top of the upper cavity is provided with a sealing cover, and a test block mounting rack is arranged in the cavity; the test block mounting rack comprises a bottom support and a top ring which are rigidly connected through a supporting piece; the bottom support annularly covers around the test block mounting opening; the inner surface of the sealing cover is provided with a convex spigot; the upper cavity is provided with an air inlet pipe joint; the sealing cover is provided with a pressing piece; the constant pressure container is provided with an air inlet and an air outlet; the air compressor is connected with the air inlet of the constant pressure container, and the air outlet of the constant pressure container is connected with the air inlet pipe joint of the test block mounting device. The measuring device has small volume, good test block sealing effect and high measuring precision of the measuring method.
Description
Technical Field
The utility model relates to a concrete performance measurement device especially relates to a concrete gas permeability measurement device and measuring method.
Background
The permeability of concrete refers to the ease with which gas, liquid or ions can permeate, diffuse or migrate under pressure, chemical potential or electric field in the porous structure of concrete. The permeability of concrete is closely related to the durability of the concrete, and the existence of pores not only affects the strength of the concrete, but also affects various performances of the concrete, such as impermeability, air tightness, corrosion resistance and the like.
The air permeability of the concrete is measured by using air as a medium, and the microstructure and the composition of a test block are not changed. Research shows that the gas tightness of the concrete to the gas is approximately the same order of magnitude or slightly higher than the gas tightness to the air, and the gas tightness to the gas can be indirectly evaluated by measuring the gas tightness of the concrete to the air, so that the gas permeation test of the concrete is not only applied to the aspect of research on the durability of the concrete, but also applied to the gas leakage prevention of the concrete in tunnel engineering. So the experimental study of the air permeability of the concrete is receiving wide attention.
In the prior art, the standard for measuring the air permeability of the concrete is a method for measuring the air permeability coefficient of the concrete in TB10120-2002 railway gas tunnel technical specification in the railway standard of the front railway department, the air permeability pressure of the test method is high, the original U-shaped glass tube is used for measuring the air permeability, and the air permeability coefficient is calculated by pressing the liquid level difference in the U-shaped tube. The disadvantages of this method include: 1. the test block has large size and large ventilation pressure; 2. sealing is not easy, and the test success rate is low; 3. the U-shaped pipe is used for measuring the ventilation pressure, manual measurement and calculation are needed, the test time is long, and the reading precision is low; 4. the U-shaped pipe measures the ventilation pressure, and the gas is dissolved in the water along with the time, so that the volume of the gas is reduced, and the ventilation pressure is lost.
Therefore, it is necessary to develop a new apparatus and method for measuring the air permeability of concrete, which facilitates the measurement and further improves the accuracy of the measurement result.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a: the concrete air permeability measuring device is smaller in size, better in test block sealing effect and higher in measuring precision.
The utility model discloses a realize that the technical scheme that above-mentioned purpose adopted does:
the test block mounting device for measuring the air permeability of the concrete is integrally in a hollow barrel shape and comprises an upper cavity and a lower cavity; the upper cavity body and the lower cavity body are communicated with each other through a test block mounting port in the test block mounting device; the top of the upper cavity is provided with a sealing cover, and a test block mounting rack is placed in the upper cavity; the test block mounting rack comprises a bottom support and a top ring, and the bottom support and the top ring are rigidly connected through a supporting piece; the bottom support is annularly covered around the test block mounting opening and is used for bearing a block to be tested, and a sealing ring is arranged between the lower surface of the bottom support and the bottom surface of the upper cavity; the inner surface of the sealing cover is provided with a convex spigot used for contacting and pressing the top ring downwards when the sealing cover is closed so as to ensure that the sealing between the lower surface of the bottom support and the bottom surface of the upper cavity body is achieved; the upper cavity is provided with a gas inlet pipe joint for leading external gas into the upper cavity through a closed pipeline; the sealing cover is also provided with a pressing piece for pressing the sealing cover and the upper cavity body to isolate external air.
During measurement, a test block is arranged in the test block mounting rack, and a connecting gap between the test block and the bottom support is sealed by adopting an adhesive, so that gas is prevented from passing through the connecting gap; then, placing the test block mounting rack with the test block in the upper cavity to ensure that the bottom support covers around the test block mounting opening; then closing and pressing the sealing cover at the top of the upper cavity to isolate the upper cavity from the outside air, wherein the convex spigot on the inner surface of the sealing cover contacts and presses the whole test block mounting rack downwards to ensure that the sealing ring between the bottom support and the bottom surface of the upper cavity realizes sealing; when gas is introduced from the outside through the gas inlet pipe joint of the upper cavity, the gas entering the upper cavity can only diffuse towards the lower cavity through the porous structure of the test block under the preset pressure, and the air permeability of the test block can be obtained based on a general calculation method by measuring the change of the air pressure of the lower cavity.
The utility model discloses among the preferred test block installation device, the epicoele in vivo, can also set up pressure spring in test block installation device, during the test pressure spring be located the test block with sealed lid between, work as sealed lid closure can pass through when compressing tightly pressure spring to test block transmission pressure to guarantee the sealing in gap between test block bottom surface and collet.
The utility model discloses among the preferred test block installation device, the lower cavity further be equipped with the pressure measurement device for the internal atmospheric pressure of survey lower cavity. In a more preferred embodiment, said pressure measuring means is an airtight pressure measuring chamber mounted on the wall of said lower chamber; one end of the airtight pressure measuring cabin is communicated with the lower cavity, and the other end of the airtight pressure measuring cabin is provided with an airtight jack; a pressure sensor and a data storage and transmission module are arranged in the airtight pressure measuring chamber; the airtight jack is internally connected with the data storage and transmission module, and the data storage and transmission module can be externally connected with a measurement and control system through a data line with a plug and used for transmitting measurement results.
Test block installation device in, the collet lower surface with go up the sealing washer between the cavity bottom surface and can fix on the collet lower surface, also can fix go up on the cavity bottom surface, be around the test block installing port promptly. For the convenience of processing, the utility model discloses it is preferred to fix on the collet lower surface.
The utility model discloses among the preferred test block installation device, sealed lid on further be equipped with the barometer for the pressure warning of cavity is gone up in the provision, avoids the mistake to uncap.
The utility model discloses in the preferred test block installation device, sealed lid on further be equipped with the relief valve for get rid of the internal pressure of epicoele.
The utility model discloses in the preferred test block installation device, the external surface of cavity of resorption further be equipped with the relief valve.
The utility model discloses in the preferred test block installation device, sealed epaxial compressing tightly of covering constitute by clamp ring and compression bolt cooperation.
The utility model discloses in the preferred test block installation device, the intake-tube connection of last cavity be single-end quick connector.
On the basis, the utility model further provides a concrete air permeability measuring device, which at least comprises an air compressor, a constant pressure container and a test block mounting device provided with the airtight pressure measuring chamber; the constant pressure container is provided with an air inlet and an air outlet; the output end of the air compressor is connected with the air inlet of the constant pressure container through an air pipeline, and the air outlet of the constant pressure container is connected with the air inlet pipe joint of the test block mounting device through the air pipeline.
When the air permeability of the concrete is measured, the air compressor transmits compressed air to the constant pressure container to enable the constant pressure container to reach the pressure required by measurement; the constant pressure container is used for measuring the required pressure and conveying gas to the test block mounting device, and the pressure is kept constant in real time; the gas penetrates through the test block in the test block mounting device under the measurement pressure within a certain time, and the airtight pressure measuring chamber measures and stores or transmits the air pressure data generated by the gas.
In order to control the atmospheric pressure of compressed air to the transmission of constant pressure container better, the utility model discloses in the preferred survey device, further be equipped with pressure controller between air compressor and the constant pressure container for through measuring pressure in the gas transmission pipeline comes the pressure value in the real-time adjustment constant pressure container. In a more preferable scheme, a component with a feedback loop, such as a PID controller, is arranged in the pressure controller to realize high-precision control and intelligent regulation of air pressure, the control precision is +/-2%, and the exhaust volume can reach 0.3m3/min。
In order to control compressed air's temperature in suitable scope, the utility model discloses in the more preferred survey device, further be equipped with cold machine of doing between air compressor and the constant voltage container, cold machine of doing entry and export respectively through the gas transmission pipeline with air compressor and constant voltage container connect for carry out the gas after the cooling to the constant voltage container after the heat transfer with air compressor output gas. In a more preferable scheme, a filtering device is further arranged between the cold dryer and the constant pressure container, and an inlet and an outlet of the filtering device are respectively connected with the cold dryer and the constant pressure container through gas transmission pipelines, so as to ensure that gas entering the constant pressure container does not contain excessive impurities.
In order to make the testing experiment process more simple and flexible, in the preferred embodiment of the present invention, the testing device is provided with a plurality of test block mounting devices provided with airtight pressure measuring chambers, the gas outlets of the constant pressure containers are valves with the same number as the test block mounting devices and are respectively connected with the gas inlet pipe joints of the test block mounting devices through gas transmission pipelines, and the constant pressure containers are provided with relays electrically connected with the valves; the measuring device is further provided with a central control system which is electrically connected with the relay to control the opening and closing of each valve of the constant pressure container so as to realize multi-channel switching. Therefore, the test of a plurality of channels can be simultaneously carried out or some channels can be independently tested, the test object and the test condition do not need to be changed by repeatedly disassembling and assembling the test block, and the whole experiment process becomes simple, convenient and flexible.
The further preferred measuring device of the utility model can be also provided with a touch control panel, the control panel is electrically connected with the central control system, and the central control system is electrically connected with the air compressor, the pressure controller, the relay for controlling each outlet valve of the constant pressure container and the airtight pressure measuring cabin of each test block mounting device; the central control system is used for receiving pressure measurement data from the airtight pressure measurement cabin, calculating the volume of the permeation gas of the test block based on an embedded calculation program, and transmitting the volume of the permeation gas to the control panel for displaying; on the other hand, the control panel is responsible for controlling the air pressure in the constant pressure container and the multi-channel switching among a plurality of valves according to the parameters input by the control panel.
The conventional use method of the concrete air permeability measuring device is as follows:
1) mounting a test block in an upper cavity of the test block mounting device and completing sealing; measuring the volume v0 of the lower cavity of the test block mounting device;
2) starting an air compressor, delivering compressed gas to a constant pressure container, delivering gas to the upper cavity of the test block mounting device in the step 1) by the constant pressure container according to preset measurement pressure, and permeating the gas to the lower cavity through the test block in the upper cavity under the preset pressure;
3) starting the air compressor, and simultaneously measuring an initial pressure value in the lower cavity by using the airtight pressure measuring cabin of the lower cavity, and marking the initial pressure value as p 1; continuously measuring a series of pressure values which change continuously in the lower cavity, and recording as p 2;
4) based on v measured in 1)0And 3) measured p1、p2Calculating the volume of the test block passing through the gas
For the measuring device of the utility model, which is provided with a plurality of test block mounting devices at the same time, when in use, the gas outlets of the constant pressure container are valves with the same number as the test block mounting devices and are respectively connected with the gas inlet pipe joints of the test block mounting devices through gas transmission pipelines, and the constant pressure container is provided with relays electrically connected with the valves; the measuring device is further provided with a central control system which is electrically connected with the relay; the test process comprises the following steps:
① installing different test blocks in the upper cavities of the test block installation devices respectively and sealing the test blocks, and measuring the volume v of the lower cavity of each test block installation device0；
Starting an air compressor, delivering compressed gas to a constant pressure container, delivering gas to the upper cavity of any test block mounting device in the step I by the constant pressure container according to the instruction of the central control system and preset pressure, and allowing the gas to permeate into the lower cavity through the test block under the preset pressure in the upper cavity;
③ starting the air compressor, measuring the initial pressure value in the lower cavity of the test block mounting device by the airtight pressure measuring cabin,is denoted by p1(ii) a Then continuously measuring the continuously changing series of pressure values in the lower cavity, and recording the pressure values as p2；
Controlling the valve of the constant-pressure container to be opened and closed through a relay according to the instruction of the central control system, and switching other test block mounting devices to complete the processes from the second step to the third step until a preset experimental scheme is completed;
⑤ Each v measured based on ①0And each group p corresponding thereto1、p2Calculating the volume of gas passing through the test block at each measurement
The pressure controller can be internally provided with a component with a feedback loop, such as a PID controller, and can realize intelligent and accurate regulation of pressure, the precision is +/-2%, and the air displacement is 0.3m3/min。
4) Or ⑤
The calculation process may be as follows:
on the premise that the test temperature in the test process is constant, the following steps are carried out:
4.1) v measured based on 1) or ①0And 3) p measured by ③1、p2Calculate p at the beginning of the test1Volume v of gas let outxThe calculation formula is shown in the following formula (I):
p1(v0+vx)＝p2v0(I)
4.2) v obtained according to 4.1)xFurther calculate each p2Test block permeation gas volume corresponding to value
The calculation formula is shown in the following formula (II):
compared with the prior art, the utility model discloses a concrete gas permeability survey device has many-sided beneficial effect, mainly embodies:
1. the test block size need not be too big, and test block simple to operate, the leakproofness is strong.
2. The measurement process is automatically measured by a precision sensor under a good sealing condition, and various defects of manual measurement by using a U-shaped pipe in the traditional measurement process are overcome.
3. The utility model discloses in install the survey that is used for different test blocks with a plurality of test block installation device simultaneously, can show the systematic error that reduces the survey, improve the accuracy of testing result.
4. In the measuring process, the pressure applied to the test block is stable and accurate through the real-time adjustment of the feedback loop of the pressure controller, and the accuracy of the measuring result is high.
Drawings
Fig. 1 is an external structure diagram of a concrete test block mounting device in embodiment 1 of the present invention.
Fig. 2 is the schematic view of the cross section of the internal structure of the concrete test block installation device in embodiment 1 of the present invention.
Fig. 3 is a schematic structural diagram of a concrete test block mounting device in embodiment 2 of the present invention.
Fig. 4 is a schematic view of the overall structure of the apparatus for measuring the air permeability of concrete according to embodiment 3 of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and specific embodiments, but the present invention is not limited to these embodiments.
Example 1
A test block mounting device for measuring the air permeability of concrete is disclosed, as shown in figures 1 and 2, and comprises an upper cavity 1 and a lower cavity 2; the upper cavity and the lower cavity are communicated with each other through a test block mounting port 20 in the test block mounting device; the upper cavity 1 is provided with a sealing ring 6 at the bottom and around the test block mounting port 20, the top is provided with a sealing cover 9, and a test block mounting rack 15 is arranged in the cavity; the test block mounting rack 15 comprises a bottom support 151 and a top ring 152, wherein the bottom support 151 and the top ring 152 are rigidly connected through a support 153; the bottom support 151 completely covers the sealing ring 6 in an annular shape and is used for bearing the block 7 to be tested; the inner surface of the sealing cover 9 is provided with a convex spigot 11, and a sealing ring 6 is arranged on the plane of the upper cavity 1 contacted with the sealing cover 9; the male spigot 11 is used for contacting and pressing the top ring 152 downwards when the sealing cover 9 is closed, and the pressure is transmitted to the bottom support 151 through the rigid support member 153, so that the sealing ring 6 below the bottom support 151 is pressed, and the sealing between the bottom support 151 and the bottom surface of the upper cavity body is ensured; the upper cavity 1 is provided with a single-head quick connector 14 for guiding external air into the upper cavity 1 through a closed pipeline; the sealing cover 9 is further provided with a pressing piece 16 for pressing the sealing cover and the upper cavity 1 to isolate external air, and the pressing piece 16 is formed by matching a pressing ring and a pressing bolt. The air pressure meter 12 and the first pressure release valve 10 are further arranged on the sealing cover 9, the air pressure meter 12 is used for providing pressure warning of the upper cavity and avoiding mistaken opening of the cover, and the first pressure release valve 10 is used for discharging pressure in the upper cavity before the sealing cover 9 is opened. The outer surface of the lower cavity 2 is further provided with a second pressure release valve 3 through an external thread butt joint 4; the bottom of the wall of the lower cavity 2 is provided with an airtight pressure measuring cabin 19; one end of the airtight pressure measuring cabin 19 is communicated with the lower cavity 2 through a double-head external thread 18, and the other end is provided with an airtight insertion hole 21; a pressure measuring circuit board 22 is arranged in the airtight pressure measuring cabin 19, and a pressure sensor and a data storage and transmission module are arranged on the pressure measuring circuit board 22; the airtight insertion hole 21 is internally connected with the data storage and transmission module of the pressure measuring circuit board 22, and the data storage and transmission module can be externally connected with a measurement and control system through a data line with a plug and used for transmitting measurement results.
During measurement, the test block 7 is arranged in the test block mounting frame 15, and a connecting gap between the test block 7 and the bottom support 151 is sealed by adopting an adhesive 5, so that gas is prevented from passing through the connecting gap; then, placing the test block mounting rack 15 loaded with the test block 7 in the upper cavity 1 to ensure that the bottom support 151 completely covers the sealing ring 6; then closing and pressing the sealing cover 9 at the top of the upper cavity to isolate the upper cavity from the outside air, and at the moment, the convex spigot 11 on the inner surface of the sealing cover 9 contacts and presses the whole test block mounting rack 15 downwards to ensure that the bottom support 151 and the sealing ring 6 are sealed; when the single-end quick connector 14 of the upper cavity 1 introduces gas from the outside, the gas entering the upper cavity 1 can only diffuse to the lower cavity 2 through the porous structure of the test block 7 under the preset pressure, and the gas permeability of the test block 7 can be obtained based on a general calculation method by measuring the change of the gas pressure of the lower cavity 2.
Example 2
A block mounting apparatus for measuring air permeability of concrete, as shown in fig. 1, 2 and 3, having the same overall structure as the block mounting apparatus of example 1 except that: in the upper cavity, a pressure spring 23 is arranged in the test block mounting frame 15, the pressure spring 23 is positioned between the test block 7 and the sealing cover 9 during testing, and when the sealing cover 9 is closed and compressed, pressure can be transmitted to the test block 7 through the pressure spring 23 so as to ensure the sealing of a gap between the bottom surface of the test block 7 and the bottom support 151.
Example 3
A concrete air permeability measuring device, as shown in figure 4, it is by the control host 30, air compressor 40, cool dry machine 50, air filter 60, constant pressure regulating valve 70, constant pressure container 80, and 6 test block mounting devices 90 described in embodiment 2 form;
the constant pressure container 80 is provided with an air inlet 801 and 6 air outlets 802, a relay is arranged in the constant pressure container 80, 6 electromagnetic valves 803 are arranged outside the constant pressure container, and the 6 air outlets 802 are respectively connected with the single-end quick connectors 14 of the 6 test block mounting devices 90 through air transmission pipelines; the 6 electromagnetic valves 803 respectively control the opening and closing of the 6 air outlets 802; an airtight plug 804 is arranged on the side wall of the constant-pressure container 80, the airtight plug 804 is internally connected with the relay, and the relay is electrically connected with 6 electromagnetic valves 803 in the constant-pressure container;
the control host 30 is provided with a built-in control circuit and a touch control panel 301, the control panel 301 is electrically connected with the control circuit, and the control circuit is electrically connected with the air compressor 30, the constant pressure regulating valve 70, the airtight plug 804 of the constant pressure container and the airtight pressure measuring chamber 19 of each test block mounting device 80.
The output end of the air compressor 40 is connected with the inlet of the cold dryer 50 through a gas transmission pipeline 0, and the outlet of the cold dryer 50 passes through the air through the gas transmission pipeline 0The filter 60 is further connected to the air inlet 801 of the constant pressure vessel 80. A constant pressure regulating valve 70 is also arranged between the air filter 60 and the constant pressure container 80, the cold dryer 50 is used for transferring cooled gas to the constant pressure container after exchanging heat with the gas output by the air compressor, and the air filter 60 is used for filtering impurities in the transferred air; the constant pressure regulating valve 70 is used for adjusting the pressure value reaching the constant pressure container in real time by measuring the pressure in the gas transmission pipeline, the PID controller is arranged in the constant pressure regulating valve 70 to realize high-precision control and intelligent regulation of the air pressure, the control precision is +/-2 percent, and the air displacement can reach 0.3m3/min。
When the air permeability of the concrete is measured, the control host 30 starts the air compressor 40, the compressed air from the air compressor 40 enters the constant pressure container 80 after being subjected to heat exchange and temperature reduction by the cold dryer 50 and filtered by the air filter 60, and when the constant pressure container 80 reaches a set value, the constant pressure regulating valve 70 sends a signal to the control host 30 through the PID controller, and the control host 30 controls the air compressor 40 to stop working. The constant pressure container 80 supplies pressure to the upper chambers of the plurality of test block mounting devices, and the constant pressure adjusting valve keeps the constant pressure container at a set value all the time. According to the parameter setting information received by the touch control panel 301, the control host 30 controls the relay to open one or more solenoid valves 803 of the constant pressure container 80, and supplies gas with constant pressure to the upper cavity of the test block mounting device 90 connected to the corresponding gas outlet 802, so that the pressure required for measurement in the upper cavity of the test block mounting device 90 is always achieved; the gas passes through the test block in the test block mounting device 90 for a predetermined period of time under a measured pressure, and the airtight pressure measuring chamber 19 measures pressure data generated by the gas passing therethrough and stores or transmits the measured data to the control main unit. A control circuit in the control host 30, which is responsible for receiving the pressure measurement data from the airtight pressure measuring cabin 19, calculating the volume of the gas passing through the test block based on an embedded calculation program, and transmitting the volume to the control panel 301 for display; on the other hand, the multi-channel switching among the valves of the constant pressure container 80 is controlled according to the parameters input by the control panel 301, so that the testing of a plurality of channels can be simultaneously carried out or some channels can be independently tested, the test object and the test conditions do not need to be changed by repeatedly disassembling and assembling test blocks, and the whole experiment process becomes simple, convenient and flexible.
The parts not mentioned in the utility model can be realized by adopting or using the prior art for reference.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "back", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (13)
1. The utility model provides a test block installation device for concrete gas permeability survey which characterized in that: the whole body of the device is in a hollow barrel shape and comprises an upper cavity and a lower cavity; the upper cavity body and the lower cavity body are communicated with each other through a test block mounting port in the test block mounting device; the top of the upper cavity is provided with a sealing cover, and a test block mounting rack is placed in the upper cavity; the test block mounting rack comprises a bottom support and a top ring, and the bottom support and the top ring are rigidly connected through a supporting piece; the bottom support is annularly covered around the test block mounting opening and is used for bearing a block to be tested, and a sealing ring is arranged between the lower surface of the bottom support and the bottom surface of the upper cavity; the inner surface of the sealing cover is provided with a convex spigot used for contacting and pressing the top ring downwards when the sealing cover is closed so as to ensure that the sealing between the lower surface of the bottom support and the bottom surface of the upper cavity body is achieved; the upper cavity is provided with a gas inlet pipe joint for leading external gas into the upper cavity through a closed pipeline; the sealing cover is also provided with a pressing piece for pressing the sealing cover and the upper cavity body to isolate external air.
2. The test block mounting apparatus according to claim 1, wherein: be equipped with pressure spring in the test block installation device, during the test pressure spring be located the test block with sealed lid between, when sealed lid closed compresses tightly can pass through pressure spring to the test block transmission pressure to guarantee the sealed of gap between test block bottom surface and collet.
3. The test block mounting apparatus according to any one of claims 1 or 2, wherein: the lower cavity is further provided with a pressure measuring device for measuring the air pressure in the lower cavity.
4. The test block mounting apparatus according to claim 3, wherein: the pressure measuring device is an airtight pressure measuring cabin arranged on the wall of the lower cavity body; one end of the airtight pressure measuring cabin is communicated with the lower cavity, and the other end of the airtight pressure measuring cabin is provided with an airtight jack; a pressure sensor and a data storage and transmission module are arranged in the airtight pressure measuring chamber; the airtight jack is internally connected with the data storage and transmission module, and the data storage and transmission module can be externally connected with a measurement and control system through a data line with a plug and used for transmitting measurement results.
5. The test block mounting apparatus according to claim 1, wherein: the sealing cover is further provided with an air pressure gauge and a pressure release valve; the pressing piece on the sealing cover is formed by matching a pressing ring and a pressing bolt; the air inlet pipe joint of the upper cavity is a single-head quick connector.
6. A concrete air permeability measuring apparatus comprising at least an air compressor, a constant pressure container, and the test block mounting apparatus according to claim 3; the constant pressure container is provided with an air inlet and an air outlet; the output end of the air compressor is connected with the air inlet of the constant pressure container through an air pipeline, and the air outlet of the constant pressure container is connected with the air inlet pipe joint of the test block mounting device through the air pipeline.
7. The assay device of claim 6, wherein: and a pressure controller is further arranged between the air compressor and the constant pressure container and used for adjusting the pressure value in the constant pressure container in real time by measuring the pressure in the gas transmission pipeline.
8. The assay device of claim 7, wherein: the pressure controller is internally provided with a component with a feedback loop.
9. The assay device of claim 7, wherein: and a PID controller is arranged in the pressure controller.
10. The assay device according to any one of claims 6 or 7, wherein: the air compressor and the constant pressure container are further provided with a cold dryer, an inlet and an outlet of the cold dryer are respectively connected with the air compressor and the constant pressure container through gas transmission pipelines, and the cold dryer is used for conveying cooled gas to the constant pressure container after heat exchange is carried out on the gas output by the air compressor.
11. The assay device of claim 10, wherein: the cold machine of doing and constant pressure vessel between further be equipped with filtration equipment, filtration equipment entry and export respectively through gas transmission pipeline with cold machine of doing and constant pressure vessel be connected for the gas that the guarantee got into the constant pressure vessel does not contain too much impurity.
12. The assay device of any one of claims 6, 7 or 11, wherein: the measuring device is provided with a plurality of test block mounting devices, the air outlets of the constant pressure container are valves with the same number as the test block mounting devices and are respectively connected with the air inlet pipe joints of the test block mounting devices through air transmission pipelines, and the constant pressure container is provided with a relay electrically connected with each valve; the measuring device is further provided with a central control system which is electrically connected with the relay to control the opening and closing of each valve of the constant pressure container so as to realize multi-channel switching.
13. The assay device of claim 12, wherein: a touch control panel is further arranged, the control panel is electrically connected with the central control system, and the central control system is electrically connected with an air compressor, a pressure controller, the relay for controlling each outlet valve of the constant pressure container and the airtight pressure measuring cabin of each test block mounting device; the central control system is used for receiving pressure measurement data from the airtight pressure measurement cabin, calculating the volume of the permeation gas of the test block based on an embedded calculation program, and transmitting the volume of the permeation gas to the control panel for displaying; on the other hand, the control panel is responsible for controlling the air pressure in the constant pressure container and the multi-channel switching among a plurality of valves according to the parameters input by the control panel.
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| CN201921177818.5U CN211453270U (en) | 2019-07-24 | 2019-07-24 | Test block mounting device and measuring device for measuring air permeability of concrete |
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| CN201921177818.5U CN211453270U (en) | 2019-07-24 | 2019-07-24 | Test block mounting device and measuring device for measuring air permeability of concrete |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110320146A (en) * | 2019-07-24 | 2019-10-11 | 北京耐尔得智能科技有限公司 | A kind of concrete air permeability apparatus and measuring method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110320146A (en) * | 2019-07-24 | 2019-10-11 | 北京耐尔得智能科技有限公司 | A kind of concrete air permeability apparatus and measuring method |
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