CN114414454B - Control method of concrete impermeability instrument - Google Patents
Control method of concrete impermeability instrument Download PDFInfo
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- CN114414454B CN114414454B CN202210041917.0A CN202210041917A CN114414454B CN 114414454 B CN114414454 B CN 114414454B CN 202210041917 A CN202210041917 A CN 202210041917A CN 114414454 B CN114414454 B CN 114414454B
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000012360 testing method Methods 0.000 claims abstract description 240
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 76
- 238000007789 sealing Methods 0.000 claims description 28
- 238000002347 injection Methods 0.000 claims description 15
- 239000007924 injection Substances 0.000 claims description 15
- 230000005540 biological transmission Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 2
- 230000000630 rising effect Effects 0.000 claims description 2
- 239000004568 cement Substances 0.000 description 6
- 238000006073 displacement reaction Methods 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 4
- 230000003487 anti-permeability effect Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/0806—Details, e.g. sample holders, mounting samples for testing
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D16/00—Control of fluid pressure
- G05D16/20—Control of fluid pressure characterised by the use of electric means
- G05D16/2006—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means
- G05D16/2013—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means
- G05D16/2026—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means with a plurality of throttling means
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- General Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Health & Medical Sciences (AREA)
- Dispersion Chemistry (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The invention discloses a control method of a concrete impermeability instrument, which comprises the following steps: loading test blocks, performing impervious test, unloading the test blocks, reloading the test blocks and the like. And placing the test block in the center of the base, and lowering the upper layer test platform to close the test cabin and lock the test platform. The combined high-pressure air bag is pressurized, so that the side wall of the test block is sealed, water is injected into the test cabin, the test cabin is pressurized and maintained, and the impervious test condition of the test block is judged through the water level sensor. And when the test is finished, the water pressure and the air pressure are withdrawn, the test platform is unlocked, the test platform is lifted, and the test block is taken out, so that the test is finished. The invention provides an open test platform which can realize multi-batch, multi-grade and running type test operation. The test station is particularly suitable for places of test stations, and meets the requirements of places with large batch and uninterrupted work, thereby reducing the test cost.
Description
Technical Field
The invention relates to a control method of a concrete impermeability instrument, in particular to a control method of a concrete impermeability instrument which is operated continuously.
Background
The method provides a method and steps for the cement concrete impermeability test according to the method for the cement concrete impermeability test in the standard JTG E30-2005 for highway engineering cement and cement concrete test procedure of the traffic industry of the people's republic of China. The method is suitable for detecting the waterproof performance of the hardened cement concrete and measuring the impervious grade of the cement concrete. The content comprises: instrument and equipment requirements, test piece preparation requirements, test steps and test result judgment.
Prior art invention patent application 202010330028.7, an air bag sealing device for concrete test block penetration test, discloses a sealing device for a concrete test piece:
the air bag comprises a base for bearing a test block, a sleeve arranged on the base, an air bag with an annular cross section arranged in the sleeve, and an upper cover covering the sleeve, wherein the height of the air bag is higher than or equal to that of the test block, an air filling cavity is arranged in the air bag, a gap is reserved between the inner wall of the air bag and the side surface of the test block before the air bag is inflated, the inner wall of the air bag is tightly attached to the side surface of the test block after the air bag is inflated, an inflation inlet communicated with the air filling cavity is arranged on the outer wall of the air bag, an opening is arranged on the corresponding position of the side wall of the sleeve and the inflation inlet, at least one water filling channel is arranged on the base, and the water filling opening of the water filling channel is arranged on the peripheral wall of the base.
The prior art patent CN104897547B 'lifting device and full-automatic concrete impermeability instrument adopting the same' discloses a full-automatic concrete impermeability instrument adopting the lifting device, which mainly comprises the following components:
a full-automatic concrete impermeability instrument adopting a lifting device comprises a lifting device, a pressure providing mechanism, a concrete test block sealing device and a test monitoring module. Wherein, the concrete test block sealing device is arranged on the lifting device; the concrete test block sealing device comprises a sealing base and a sealing sleeve matched with the shape of the concrete test block, a boss is arranged on the upper surface of the sealing base, the shape of the boss is matched with the bottom of the sealing sleeve, and a water injection through hole is arranged in the center of the boss; the lifting device comprises a first fixing frame, an up-down displacement driving device, a lifting column, at least two fixing seats and locking pieces, wherein the first fixing frame comprises a lower fixing frame and vertical fixing pieces vertically arranged on the lower fixing frame, the up-down displacement driving device is fixed on the lower fixing frame, one end of the lifting column is fixedly connected with the telescopic end of the up-down displacement driving device, the lifting column are vertical to the lower fixing frame of the first fixing frame, clamping grooves are formed in the lifting column, the number of the clamping grooves corresponds to that of the fixing seats, penetrating holes are formed in the fixing seats, the free ends of the lifting column sequentially penetrate through the penetrating holes of the at least two fixing seats, the upper parts of sealing sleeves of the locking pieces and the concrete test block sealing device are fixedly connected with the lower surface of the fixing seats above, the lower surface of the sealing base of the concrete test block sealing device is fixedly contacted with the fixing seats below, and the clamping ends of the locking pieces are opposite to the clamping grooves on the lifting column when the sealing base arranged on the fixing seats below reach a sealing state. The test monitoring module is used for responding to the input operation of an operator, controlling the clamping end of the locking piece to be clamped into the clamping groove of the lifting column, controlling the up-down displacement driving device to work so as to separate the sealing sleeve from the sealing base or enable the sealing sleeve to be buckled on the sealing base, and controlling the pressure providing mechanism to inject water with preset pressure through the water injection through hole on the sealing base so as to test the impermeability of the concrete test block in the concrete test block sealing device.
Wherein the test monitor module is only described in general terms of functionality.
Disclosure of Invention
In view of the problems of the prior art, the invention provides a control method of a concrete impermeability instrument. In particular to an automatic test control method of a concrete impermeability instrument.
The technical scheme of the invention is as follows:
the invention provides a control method of a concrete impermeability instrument. The method comprises the following steps:
first step, test block loading
The multi-layer test platform is horizontally arranged, a first layer, namely a bottom layer test platform, is fixed on the frame, and other layers of test platforms can be lifted along the vertical upright post; the multiple bases are arranged on the test platform, the sleeves corresponding to the bases are arranged on the upper layer of test platform, the bases are lifted along with the upper layer of test platform, and the bases are in one-to-one correspondence with the sleeves; the base, the test blocks and the sleeve form a test cabin, and a plurality of test blocks on the same layer are tested simultaneously, so that the test is completed simultaneously. Generally, each layer of test platform is provided with 6 groups of seats or 12 groups of seats, and the lower plane of the upper layer of test platform matched with the seats is provided with the same number of sleeves. The first layer, i.e. the bottom layer, test platform is a non-movable fixture with only a base and no sleeve. Only the sleeve on the top test platform is matched with the base of the lower layer.
And (3) starting a certain layer of test platform loading test blocks, respectively placing the test blocks in the center of the base, sending a closed test cabin instruction by the control main board, and driving the servo motor to drive the chain and the roller screw rod through the output interface circuit so that all the test platforms at the upper layer synchronously descend along the upright post. At this time, all the layers above the layer are integrally moved.
The lower limit sensor sends out limit signals, the limit signals enter the control main board through the input interface circuit, the control main board sends out platform stop instructions, and the output interface circuit controls the servo motor to stop descending of all upper test platforms along the upright post; the sleeve arranged on the lower plane of the upper layer of test platform is correspondingly sleeved on the test block, and the test cabin is closed. The top layer test platform moves up and down along with loading or unloading test blocks on any layer test platform, so that the mounting positions of the upper limit sensor and the lower limit sensor can be selected at the upper end and the lower end of the displacement range of the top layer test platform.
The control main board sends out a platform locking instruction, and the air cylinder electromagnetic valve is controlled through the output interface circuit to enable air cylinder air pressure to push the safety lock catch to lock the upper layer of test platform to inhibit movement, and at the moment, all the test platforms are in a safety lock locking state. Each layer of experiment platform except the bottom layer is provided with an independent safety lock mechanism, locking and unlocking are controlled independently, all layers of experiment platforms are in a locking state in the impermeability test process, and when a certain layer of experiment platform is tested, only the layer of experiment platform is unlocked, so that the test block can be replaced conveniently.
Second step, impervious test
The control main board sends out a sealing test block instruction, the sealing electromagnetic valve is opened through the output interface circuit, so that the high-pressure air source enters the combined high-pressure air bag through the air hole on the side wall of the sleeve, the combined high-pressure air bag is positioned between the inner side of the side wall of the sleeve and the side surface of the test block, and the side wall of the test block is pressurized after the combined high-pressure air bag is inflated, so that the effect of sealing the side wall of the test block is achieved. A group of 6 test cabins is provided with a pneumatic passage, and a group of test cabins are pressurized and sealed at the same time and unsealed at the same time.
The control main board sends out a water injection pressurizing instruction, the water injection pressurizing electromagnetic valve is opened through the output interface circuit, the high-pressure water pump is used for injecting water into the test cabin through the water injection hole below the base, water injection pressure from the bottom surface of the test block to the top surface direction of the test block is formed in the test cabin, the control main board reads the water pressure signal of the water pressure sensor through the input interface circuit, and the water pump stops working to enter a pressure maintaining state after the water pressure reaches a test value. Considering the discreteness of the impervious grade of the test block, each test cabin is provided with an independent water injection pressurizing passage and an independent water level sensor.
A water level sensor is arranged above the sleeve, a water level signal acquired by the water level sensor is input into a control main board through an input interface circuit, and the control main board judges the impervious test condition of the test block.
Third step, unloading test block
When the test is completed, the control main board sends out a command for canceling the water pressure, the electromagnetic valve for canceling the water pressure is controlled by the output interface circuit, and the water pressure is removed by the water injection hole of the base through the electromagnetic valve for canceling the water pressure.
The air pressure canceling instruction sent by the control main board is controlled to open by the output interface circuit, and air bag gas between the sleeve and the test block is discharged through the air holes on the side face of the sleeve, so that the air bag is separated from the test block, and the sleeve is conveniently withdrawn upwards from the test block.
The control main board sends out a platform unlocking instruction, and the air cylinder electromagnetic valve is controlled by the output interface circuit to push the safety lock catch to unlock, so that all test platforms on the upper layer are allowed to lift along the upright post. At this time, all the platforms above the layer are in a locking state and can be in a pressurizing test state.
The control main board sends a platform up-moving instruction, the servo motor is started through the output interface circuit, and the transmission chain drives the roller screw rod to enable all test platforms on the upper layer to move up along the upright post synchronously.
The upper limit sensor sends out limit signals, the limit signals enter the control main board through the input interface circuit, the control main board sends out platform stop instructions, and the servo motor is enabled to rotate through the output interface circuit to drive the chain and the transmission shaft so that all test platforms at the upper layer stop rising along the lifting column; at this time, the sleeve moves upwards along with the upper layer test platform to separate from the test block, and the test block is taken out to finish the unloading operation of the layer test block.
Fourth step, reloading test block
And loading the test blocks on the test platform from which the test blocks are unloaded under the condition that the test of other test platforms is not influenced, and then carrying out a new round of test on the test platform.
In the second step, water is injected into the test cabin to press, the water pressure starts from 0.1MPa, the water pressure is increased by 0.1MPa every 8 hours until the target value of the water pressure setting is reached, the designed anti-permeability grade is obtained, at the moment, the water level sensor signal is not detected by less than or equal to 2 test blocks in a group of 6 test blocks, and the anti-permeability test of the group of test blocks is completed.
And (3) injecting water into the test cabin to press, stopping pressing and removing water pressure when the water level sensor signals of 3 test blocks are detected in a group of 6 test blocks, and finishing the impermeability test of the group of test blocks, wherein the water pressure value at the moment corresponds to the impermeability grade of the group of test blocks.
The invention has the beneficial effects that:
each layer of test platform of the concrete impermeability instrument works independently, and the loading and unloading test blocks of one layer of test platform do not influence the continuous work of the other layers of test platforms. Therefore, the invention provides an open test platform which can realize multi-batch, multi-grade and running water type test. The test station is particularly suitable for places of test stations, and can meet the requirement of large-batch uninterrupted place work, thereby reducing the test cost and improving the detection efficiency.
Drawings
FIG. 1 is a general flow chart of the present invention;
FIG. 2 is a block loading flow chart of the present invention;
FIG. 3 is a flow chart of an anti-permeation test of the present invention;
FIG. 4 is a flow chart of the invention for test block unloading;
FIG. 5 is a schematic view of the appearance of a permeation resistant engine according to the present invention;
FIG. 6 is a schematic diagram of a control motherboard according to the present invention;
FIG. 7 is a schematic view of a driving lift mechanism according to the present invention;
fig. 8 is a cross-sectional view of a test chamber of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1, the overall flowchart of the present invention mainly includes three steps: test block loading, permeation resistance testing and test block unloading. According to the multi-layer test platform, each layer of test flow is independently completed. After the test block test is completed by one layer of test platform, the test block can be independently unloaded, and a new test block is loaded for testing, so that the test flow of other test platform layers can not be interrupted.
As shown in FIG. 2, the block loading flow chart of the present invention. The test block is placed on a base of the test platform, the upper layer test platform descends, the test cabin is closed, and the test platform is locked.
As shown in FIG. 3, a flow chart of the permeation resistance test according to the present invention. The water level sensor mainly comprises a test block in a sealed test cabin, water is injected into the test cabin to press and keep the water pressure, and the water level sensor collects water level signals.
As shown in FIG. 4, the present invention is a block unloading flowchart. The method mainly comprises the steps of removing the water pressure of the test cabin, removing the air pressure of the test cabin, unlocking the test platform, lifting the test platform and taking out the test block.
As shown in FIG. 5, the permeation resistant engine of the present invention is shown in a schematic external view. Six layers of six test cabins, namely one group, can simultaneously perform impervious tests of 36 test blocks.
As shown in fig. 6, the control motherboard of the present invention is schematically shown. The control main board comprises a CPU, a memory, a display operation panel, an input interface circuit and an output interface circuit.
As shown in fig. 7, the driving lifting mechanism of the present invention is schematically shown. The servo motor is utilized to rotate and drive the chain to drive the roller screw rod to enable the platform to lift.
As shown in fig. 8, a cross-sectional view of the test chamber of the present invention. The high-pressure air source is communicated with the combined high-pressure air bag through the sealing electromagnetic valve and the air holes on the side wall of the sleeve. The high-pressure water pump is communicated with the water injection hole below the base through the water injection pressurizing electromagnetic valve. A water level sensor and the like are arranged above the test cabin.
Claims (4)
1. A control method of a concrete impermeability instrument is characterized by comprising the following steps:
step 1: test block loading
The multi-layer test platform is horizontally arranged, a first layer, namely a bottom layer test platform, is fixed on the frame, and other layers of test platforms can be lifted along the vertical upright post; the multiple bases are arranged on the test platform, the sleeves corresponding to the bases are arranged on the upper layer of test platform, the bases are lifted along with the upper layer of test platform, and the bases are in one-to-one correspondence with the sleeves; the base, the test blocks and the sleeve form a test cabin, and a plurality of test blocks on the same layer are tested simultaneously to finish the test simultaneously;
starting a certain layer of test platform to load test blocks, respectively placing the test blocks in the center of a base, sending a closed test cabin instruction by a control main board, and driving a servo motor to drive a chain and a roller screw rod through an output interface circuit so that all test platforms on the upper layer synchronously descend along an upright post;
the lower limit sensor sends out limit signals, the limit signals enter the control main board through the input interface circuit, the control main board sends out platform stop instructions, and the output interface circuit controls the servo motor to stop descending of all upper test platforms along the upright post; the sleeve arranged on the lower plane of the upper layer of test platform is correspondingly sleeved on the test block, and the test cabin is closed;
the control main board sends out a platform locking instruction, and the output interface circuit controls the air cylinder electromagnetic valve to enable air cylinder air pressure to push the safety lock catch to lock the upper layer of test platform to inhibit movement, and at the moment, all the test platforms are in a safety lock locking state;
step 2: impervious test
The control main board sends out a sealing test block instruction, the sealing electromagnetic valve is opened through the output interface circuit, so that the high-pressure air source enters the combined high-pressure air bag through the air hole on the side wall of the sleeve, the combined high-pressure air bag is positioned between the inner side of the side wall of the sleeve and the side surface of the test block, and the side wall of the test block is pressurized after the combined high-pressure air bag is inflated, so that the effect of sealing the side wall of the test block is achieved;
the control main board sends out a water injection pressurizing instruction, the water injection pressurizing electromagnetic valve is opened through the output interface circuit, the high-pressure water pump injects water into the test cabin through the water injection hole below the base, water injection pressure from the bottom surface of the test block to the top surface of the test block is formed in the test cabin, the control main board reads the water pressure signal of the water pressure sensor through the input interface circuit, and the water pump stops working to enter a pressure maintaining state after the water pressure reaches a test value;
a water level sensor is arranged above the sleeve, a water level signal acquired by the water level sensor is input into a control main board through an input interface circuit, and the control main board judges the impervious test condition of the test block;
step 3: test block unloading
When the test is completed, the control main board sends out a command for canceling the water pressure, the electromagnetic valve for canceling the water pressure is controlled by the output interface circuit, and the water pressure is removed by the water injection hole of the base through the electromagnetic valve for canceling the water pressure;
the control main board sends out an air pressure withdrawal instruction, the output interface circuit controls the opening of the pressure relief electromagnetic valve, air bag gas between the sleeve and the test block is discharged through the air hole on the side surface of the sleeve, so that the air bag is separated from the test block, and the sleeve is conveniently withdrawn upwards from the test block;
the control main board sends out a platform unlocking instruction, and the output interface circuit controls the air cylinder electromagnetic valve to push the safety lock catch to unlock, so that all test platforms on the upper layer are allowed to lift along the upright post;
the control main board sends a platform up-shifting instruction, the servo motor is started through the output interface circuit, and the transmission chain drives the roller screw rod to enable all test platforms on the upper layer to synchronously move up along the upright post;
the upper limit sensor sends out limit signals, the limit signals enter the control main board through the input interface circuit, the control main board sends out platform stop instructions, the servo motor is enabled to rotate through the output interface circuit to drive the chain and the roller screw rod, and all test platforms at the upper layer stop rising along the lifting column; at the moment, the sleeve moves upwards along with the upper layer test platform to separate from the test block, and the test block is taken out to finish the unloading operation of the layer test block;
step 4: test block reloading
And loading the test blocks on the test platform from which the test blocks are unloaded under the condition that the test of other test platforms is not influenced, and then carrying out a new round of test on the test platform.
2. The method for controlling a concrete permeation resistance meter according to claim 1, wherein: each layer of test platform is provided with 6 groups of bases or 12 groups of bases, and the lower plane of the upper layer of test platform matched with the bases is provided with the same number of sleeves.
3. The method for controlling a concrete permeation resistance instrument according to claim 2, wherein: in the impermeability test of step 2, water is injected into the test cabin to press, the water pressure starts from 0.1MPa, the water pressure is increased by 0.1MPa every 8 hours until the target value of the water pressure setting is reached, namely the designed impermeability grade is achieved, at the moment, the water level sensor signal is not detected by less than or equal to 2 test blocks in a group of 6 test blocks, and the impermeability test of the group of test blocks is completed.
4. A method of controlling a concrete permeation resistance meter according to claim 3, wherein: and (3) injecting water into the test cabin to press, stopping pressing and removing water pressure when the water level sensor signals of 3 test blocks are detected in a group of 6 test blocks, and finishing the impermeability test of the group of test blocks, wherein the water pressure value at the moment corresponds to the impermeability grade of the group of test blocks.
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| CN202210041917.0A CN114414454B (en) | 2022-01-14 | 2022-01-14 | Control method of concrete impermeability instrument |
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| CN202210041917.0A CN114414454B (en) | 2022-01-14 | 2022-01-14 | Control method of concrete impermeability instrument |
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| CN114414454B true CN114414454B (en) | 2024-03-19 |
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| CN115266537A (en) * | 2022-09-29 | 2022-11-01 | 南京研华智能科技有限公司 | Full-automatic concrete impermeability detection system |
| CN116465814B (en) * | 2023-06-19 | 2023-09-22 | 四川省兴冶岩土工程检测有限责任公司 | Concrete impermeability instrument control system, method and computer readable storage medium |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103076266A (en) * | 2012-11-27 | 2013-05-01 | 宁夏新三思检测设备有限公司 | Automatic concrete penetration detection apparatus |
| WO2018090540A1 (en) * | 2016-11-15 | 2018-05-24 | 广东中科华大工程技术检测有限公司 | Concrete impermeable test-piece sleeve and impermeability performance measurement apparatus |
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- 2022-01-14 CN CN202210041917.0A patent/CN114414454B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103076266A (en) * | 2012-11-27 | 2013-05-01 | 宁夏新三思检测设备有限公司 | Automatic concrete penetration detection apparatus |
| WO2018090540A1 (en) * | 2016-11-15 | 2018-05-24 | 广东中科华大工程技术检测有限公司 | Concrete impermeable test-piece sleeve and impermeability performance measurement apparatus |
Non-Patent Citations (1)
| Title |
|---|
| 混凝土抗渗性试验探索与分析;丁莉;王锋;朱政兴;;山东水利;20200315(03);全文 * |
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