CN106769602B - An automatic testing device and method for axial distribution of corroded steel bar sections - Google Patents
An automatic testing device and method for axial distribution of corroded steel bar sections Download PDFInfo
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- CN106769602B CN106769602B CN201611217580.5A CN201611217580A CN106769602B CN 106769602 B CN106769602 B CN 106769602B CN 201611217580 A CN201611217580 A CN 201611217580A CN 106769602 B CN106769602 B CN 106769602B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/006—Investigating resistance of materials to the weather, to corrosion, or to light of metals
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Abstract
本发明公开了一种锈蚀钢筋截面轴向分布的自动测试装置和方法，自动测试装置包括机架、称重仪、计算机系统和钢筋下降装置，钢筋下降装置包括钢筋夹头和夹头下降机构；夹头下降机构包括浮子、水箱、吊索、通气管和三个定滑轮；水箱上部封闭，下部包括出水口；通气管穿过水箱竖直地插入至水箱下部；水箱布置在容器上方，浮子松套在通气管上；第一定滑轮布置在通气管的下方，第二定滑轮布置在通气管的上方，第三定滑轮位于钢筋夹头的正上方；吊索的下端与钢筋夹头连接，从钢筋夹头引出的吊索先后绕过第三定滑轮和第二定滑轮后再绕过第一定滑轮，上端与浮子连接。本发明结构简单、不需要动力、操作简便，测试精度可以满足检测需要。
The invention discloses an automatic testing device and method for the axial distribution of corroded steel bar sections. The automatic testing device includes a frame, a weighing instrument, a computer system and a steel bar lowering device. The steel bar lowering device includes a steel bar chuck and a chuck lowering mechanism; The chuck lowering mechanism includes a float, a water tank, a sling, a vent pipe and three fixed pulleys; the upper part of the water tank is closed, and the lower part includes a water outlet; the vent pipe is inserted vertically through the water tank to the lower part of the water tank; the water tank is arranged above the container, and the float is loose Set on the vent pipe; the first fixed pulley is arranged below the vent pipe, the second fixed pulley is arranged above the vent pipe, and the third fixed pulley is located directly above the steel bar chuck; the lower end of the sling is connected to the steel bar chuck. The sling led from the steel bar clamp successively goes around the third fixed pulley and the second fixed pulley, and then around the first fixed pulley, and the upper end is connected to the float. The invention has a simple structure, does not require power, is easy to operate, and the test accuracy can meet the detection needs.
Description
[ technical field ]
The invention relates to measurement of a corrosion condition of a steel bar, in particular to an automatic testing device and method for axial distribution of a section of a corroded steel bar.
[ background Art ]
In the civil engineering field, steel bars and concrete are the most widely used building materials in the world at present, and statistics shows that 80% of building structures are poured by concrete at present. However, the corrosion of the steel bars in the concrete is caused by the corrosion of external environment factors such as chloride ions, carbon dioxide and the like, the section of the steel bars is reduced due to the corrosion, the stress concentration and the mechanical property of the steel bars are reduced, and the safety and the durability of the structure are seriously affected. The corrosion rate of the steel bar and the axial distribution condition of the rest section of the steel bar along the section are important parameters for researching the corrosion of the steel bar.
The invention discloses a measuring device and a measuring method for corrosion rate of steel bars, which are disclosed in the patent number CN 201410151435.6. The measuring device for the corrosion rate of the steel bar comprises a weighing instrument, a computer system, a clamp and a container for containing liquid, wherein the computer system comprises a processor, an input device and a display device, the data output end of the weighing instrument is connected with the processor of the computer system, the measuring device comprises a steel bar lifting device, the steel bar lifting device comprises a frame, the clamp, a clamp lifting mechanism and a linear displacement sensor for sensing the lifting distance of the clamp, and the displacement data output end of the linear displacement sensor is connected with the processor of the computer system. The method has the advantages of simple operation, high detection efficiency and high detection precision, and can accurately obtain the maximum corrosion rate along the length direction of the steel bar and the corrosion rate curve along the length direction of the steel bar. However, the device for measuring the corrosion rate of the steel bar has a complex structure and consumes power.
[ summary of the invention ]
The invention aims to provide an automatic testing device for axial distribution of a section of a rusted steel bar, which is simple in structure and does not need power.
The invention further aims to provide an automatic testing method for the axial distribution of the section of the rusted steel bar, which is simple in structure and does not need power.
In order to solve the technical problem, the technical scheme adopted by the invention is that the automatic testing device for the axial distribution of the section of the rusted steel bar comprises a frame, a weighing instrument, a computer system, a steel bar descending device and a container for containing liquid, wherein the computer system comprises a processor, an input device and a display device, and the data output end of the weighing instrument is connected with the processor of the computer system; the steel bar descending device comprises a steel bar clamping head and a clamping head descending mechanism; the chuck descending mechanism comprises a floater, a water tank, a sling, a vent pipe, a first fixed pulley, a second fixed pulley and a third fixed pulley; the upper part of the water tank is closed, and the lower part of the water tank comprises a water outlet; the vent pipe vertically penetrates through the top plate of the water tank from top to bottom and is inserted into the lower part of the water tank; the water tank is arranged above the container, the floater is arranged in the water tank, and the floater is loosely sleeved on the breather pipe; the first fixed pulley is arranged below the vent pipe, the second fixed pulley is arranged above the vent pipe, and the third fixed pulley is arranged right above the steel bar clamping head; the lower end of the sling is connected with the steel bar clamping head, the sling led out from the steel bar clamping head passes through the vent pipe after sequentially bypassing the third fixed pulley and the second fixed pulley, then bypasses the first fixed pulley, and the upper end is connected with the floater.
In the automatic testing device, the floats are foam blocks.
In the automatic test device, the float is hemispherical.
The automatic testing device is characterized in that the weighing instrument is an automatic weighing recorder.
The automatic testing device is characterized in that the water outlet of the water tank is provided with the measuring hole and the valve.
The automatic testing device comprises a rubber plug, wherein the middle part of a top plate of the water tank comprises a rubber plug hole, and the rubber plug is embedded into the rubber plug hole; the vent pipe is inserted into the water tank through the through hole in the middle of the rubber plug.
The automatic testing device comprises a sling, wherein the sling comprises two sub-ropes, the first fixed pulley comprises two parallel pulleys, after the sling downwards passes through the vent pipe, the two sub-ropes respectively bypass one pulley, and the upper ends of the sub-ropes are connected with the floater.
The automatic testing method for the axial distribution of the sections of the rusted steel bars comprises the automatic testing device, and the testing process comprises the following steps:
801. the container is filled with test liquid, and the lower end of the tested steel bar is inserted into the liquid level of the test liquid;
802. opening a water outlet of the water tank, and gradually enabling the tested steel bars to enter the test liquid of the container along with the descending of the liquid level in the water tank; the automatic weighing recorder is used for reading the quality data according to the set time interval and transmitting the quality data and the corresponding time value to the computer system;
803. and the computer system calculates the data and/or the corrosion rate of the residual section value of the corrosion steel bar along the axial distribution according to the descending speed, the mass data and the corresponding time value of the measured steel bar.
The automatic test method comprises the following test steps of the steel bar descending rate:
901. a measuring cup is placed below the water outlet of the water tank, the water outlet is opened, and timing is performed; allowing water in the water tank to flow into the measuring cup through the water outlet, and measuring the flow of the water outlet of the water tank according to the water inflow in the measuring cup and the water outlet time of the water outlet:
902. and calculating the descending speed of the liquid level in the water tank when the water flows out of the water outlet according to the flow of the water outlet and the cross section area inside the water tank, wherein the descending speed of the steel bar is equal to the descending speed of the liquid level in the water tank.
The automatic testing device for the axial distribution of the sections of the rusted steel bars has the advantages of simple structure, no power, simple and convenient operation and capability of meeting the detection requirement of the testing precision.
[ description of the drawings ]
The invention will be described in further detail with reference to the drawings and the detailed description.
Fig. 1 is a schematic structural diagram of an automatic testing device for axial distribution of a section of a rusted steel bar according to an embodiment of the present invention.
Detailed description of the preferred embodiments
The structure of the automatic testing device for the axial distribution of the section of the rusted steel bar in the embodiment of the invention is shown in fig. 1, and the automatic testing device comprises a frame 10, an automatic weighing recorder 13, a computer system (not shown in the figure), a steel bar descending device and a container 11 for containing liquid. The container 11 is placed on the table of the automatic weight recorder 13.
The computer system comprises a processor, an input device and a display device, and the data output end of the automatic weighing recorder 13 is connected with the processor of the computer system.
The steel bar descending device comprises a steel bar clamping head 1 and a clamping head descending mechanism.
The chuck descending mechanism comprises a floater 3, a water tank 4, a sling 5, a vent pipe 2, a fixed pulley 6, a fixed pulley 7 and a fixed pulley 8.
The upper part of the water tank 4 is closed, the lower part is provided with a water outlet, and the water outlet is provided with a measuring hole and a valve 9. The middle part of the water tank top plate 401 is provided with a rubber plug hole, and the rubber plug 402 is plugged into the rubber plug hole. The vent pipe 2 is vertically inserted into the lower portion of the water tank 4 through a through hole in the middle of the rubber stopper 402.
The water tank 4 is arranged on the frame 10 and above the container 11, the floater 3 is arranged in the water tank 4, the floater 3 is a hemispherical foam block, a vertical through hole is arranged in the middle of the floater 3, and the floater 3 is loosely sleeved on the vent pipe 2 and is in sliding fit with the vent pipe 2. The diameter of the buoyancy 3 is slightly smaller than the inner diameter of the water tank 4.
The fixed pulley 6 is arranged below the ventilation pipe 2, the fixed pulley 7 is arranged above the ventilation pipe 2, and the fixed pulley 8 is positioned right above the steel bar clamping head 1.
The fixed pulley 6 is provided with two parallel pulleys, the sling 5 consists of two nylon wires 501, the lower end of the sling 5 is connected with the steel bar clamping head 1, and the sling 5 led out from the steel bar clamping head 1 passes through the ventilation pipe 2 after bypassing the fixed pulley 8 and the fixed pulley 7. After the sling 5 passes through the breather pipe 2 downwards, two nylon wires 501 respectively bypass one pulley of the fixed pulley 6, and the upper end of the nylon wires 501 is connected with the floater 3.
The water tank 4 is filled with a large amount of saturated saline 401, and the top of the water tank 4 is a closed air chamber. The water tank 4 is a constant flow device, the height distance between the lower end Q of the ventilation pipe 2 and the water outlet P of the water tank determines the water level difference between the lower end Q of the ventilation pipe and the water outlet P of the water tank, and the flow rate of the water outlet of the water tank can be adjusted by adjusting the insertion depth of the ventilation pipe 2. The flow value of the water outlet of the water tank can be measured by a measuring cup and a stopwatch.
When the water outlet of the water tank discharges water, the liquid level in the water tank 4 and the descending speed of the floater can be calculated through the flow value of the water outlet of the water tank and the cross-sectional area of the water tank. When the water outlet of the water tank discharges water, the descending speed of the steel bar clamping head 1 is the same as the descending speed of the floater.
The steel bar clamping head 1 is clamped at the top end of the steel bar 100 to be tested, the container 11 is filled with the test liquid 1101, the steel bar 100 to be tested falls down, and the lower end of the steel bar is placed under the liquid level of the test liquid. The test liquid 1101 is preferably a liquid having a small specific gravity such as methanol, ethanol, or gasoline.
The invention relates to an automatic testing device for axial distribution of a section of a rusted steel bar, which comprises the following steps:
1) Measuring the descending speed of the steel bar in advance:
the rate of steel bar drop can be calculated by the related principle of the constant flow bottle, but because the flow rate can be influenced by other factors such as liquid viscosity, in order to obtain more accurate test results, test errors are reduced, and the embodiment carries out actual measurement on the flow rate of liquid: a measuring cup is placed below the water outlet of the water tank, the water outlet is opened, and timing is performed; allowing water in the water tank to flow into the measuring cup through the water outlet, and measuring the flow of the water outlet of the water tank according to the water inflow in the measuring cup and the water outlet time of the water outlet:
and calculating the descending speed of the liquid level in the water tank when the water flows out of the water outlet according to the flow of the water outlet and the cross section area inside the water tank, wherein the descending speed of the steel bar is equal to the descending speed of the liquid level in the water tank.
2) After measuring the rate of decline of the steel bar, testing the data and/or the rust rate of the axial distribution of the values of the rest section of the rust-corroded steel bar:
the container is filled with test liquid, and the lower end of the tested steel bar is inserted into the liquid level of the test liquid;
opening a water outlet of the water tank, and gradually enabling the tested steel bars to enter the test liquid of the container along with the descending of the liquid level in the water tank; the automatic weighing recorder is used for reading the quality data according to the set time interval and transmitting the quality data and the corresponding time value to the computer system;
and the computer system calculates the data and/or the corrosion rate of the residual section value of the corrosion steel bar along the axial distribution according to the descending speed, the mass data and the corresponding time value of the measured steel bar.
The water tank of the above embodiment of the invention is a constant flow device, and water is discharged through the water outlet of the water tank, so that the liquid level of the saturated saline solution 401 in the water tank 4 is lowered, and the float 3 floating on the liquid level in the water tank 4 is lowered, so that the tested steel bar 100 is immersed in the test solution 1101 in the container 11. The flow of water discharged from the water outlet of the water tank determines the water inlet rate of the steel bar, and errors caused by visual observation of the descending depth of the steel bar by test operators can be avoided. The adopted automatic weighing recorder 13 not only can weigh data, but also can automatically record the read quality data according to a certain time interval, so that complicated manual operation is avoided.
The light foam plate with large area is used as the floater, so that the floater is ensured to float on the liquid surface with enough buoyancy, and the test error is reduced. The upper part of the floater of the hemisphere is large and small, so that the influence of the buoyancy of the test liquid on the moving precision of the tested steel bar is reduced, and the bubbles can conveniently rise into the space at the upper part of the water tank.
The test liquid contained in the container 11 is methanol, ethanol or gasoline.
Weighing value m of i displacement interval values of steel bar drop i The cross-sectional area Si of the steel bar is reduced by i displacement interval values:
wherein m is i -weighing value at time i;
g-gravitational acceleration;
ρ—density of liquid;
h, the descending distance of the steel bar in unit time;
let the original cross-sectional area of the steel bar be S 0 According to S 0 And S is i Obtaining the rust ratio C when i set displacement interval values are reduced along the length direction of the steel bar i ：
The automatic testing device for the corrosion rate of the steel bar is simple and easy, does not need power, is simple to operate, high in detection efficiency and high in detection precision, is fully automatic in whole detection, does not need manual operation except starting equipment at the beginning of a test, can accurately obtain the maximum corrosion rate along the length direction of the steel bar, and can meet the detection requirement in the detection precision.
Claims (8)
1. The automatic testing method for the axial distribution of the section of the rusted steel bar is characterized in that the used automatic testing device comprises a rack, a weighing instrument, a computer system, a steel bar descending device and a container for containing liquid, wherein the computer system comprises a processor, an input device and a display device, and the data output end of the weighing instrument is connected with the processor of the computer system; the steel bar descending device comprises a steel bar clamping head and a clamping head descending mechanism; the chuck descending mechanism comprises a floater, a water tank, a sling, a vent pipe and three fixed pulleys; the upper part of the water tank is closed, and the lower part of the water tank comprises a water outlet; the vent pipe vertically penetrates through the top plate of the water tank from top to bottom and is inserted into the lower part of the water tank; the water tank is arranged above the container, the floater is arranged in the water tank, and the floater is loosely sleeved on the breather pipe; the first fixed pulley is arranged below the vent pipe, the second fixed pulley is arranged above the vent pipe, and the third fixed pulley is arranged right above the steel bar clamping head; the lower end of the sling is connected with the steel bar clamping head, the sling led out from the steel bar clamping head passes through the vent pipe after sequentially bypassing the third fixed pulley and the second fixed pulley, then bypasses the first fixed pulley, and the upper end is connected with the floater; the test process comprises the following steps:
101 The container is filled with test liquid, and the lower end of the tested steel bar is inserted into the liquid level of the test liquid;
102 Opening the water outlet of the water tank, and gradually entering the tested steel bar into the test liquid of the container along with the decline of the liquid level in the water tank; the weighing instrument reads the quality data according to the set time interval and transmits the quality data and the corresponding time value to the computer system;
103 The computer system calculates the data and/or the corrosion rate of the residual section value of the corrosion steel bar along the axial distribution according to the descending speed, the quality data and the corresponding time value of the measured steel bar.
2. The automated test method of claim 1, wherein the float is a foam block.
3. The automated test method of claim 1, wherein the float is hemispherical.
4. The automated test equipment of claim 1, wherein the weigh scale is an automated weigh recorder.
5. The automatic test method of claim 1 wherein the water outlet of the water tank is provided with a metering orifice and a valve.
6. The automatic test method of claim 1 including a rubber plug, the middle of the tank top plate including a plug hole into which the rubber plug is inserted; the vent pipe is inserted into the water tank through the through hole in the middle of the rubber plug.
7. The automatic test method of claim 1 wherein the sling includes two split ropes, the first fixed pulley includes two side-by-side pulleys, the two split ropes each bypass one pulley after the sling passes down through the vent pipe, and the upper ends of the split ropes are connected to the float.
8. The automatic test method of claim 1 including the step of testing the rate of descent of the rebar:
801 A measuring cup is placed below the water outlet of the water tank, the water outlet is opened, and timing is performed; allowing water in the water tank to flow into the measuring cup through the water outlet, and measuring the flow of the water outlet of the water tank according to the water inflow in the measuring cup and the water outlet time of the water outlet:
802 According to the flow of the water outlet and the cross-sectional area inside the water tank, calculating the descending speed of the liquid level in the water tank when the water flows out of the water outlet, wherein the descending speed of the steel bar is equal to the descending speed of the liquid level in the water tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611217580.5A CN106769602B (en) | 2016-12-26 | 2016-12-26 | An automatic testing device and method for axial distribution of corroded steel bar sections |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611217580.5A CN106769602B (en) | 2016-12-26 | 2016-12-26 | An automatic testing device and method for axial distribution of corroded steel bar sections |
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| Publication Number | Publication Date |
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| CN106769602A CN106769602A (en) | 2017-05-31 |
| CN106769602B true CN106769602B (en) | 2023-12-26 |
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| CN201611217580.5A Expired - Fee Related CN106769602B (en) | 2016-12-26 | 2016-12-26 | An automatic testing device and method for axial distribution of corroded steel bar sections |
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| CN111444629B (en) * | 2020-04-15 | 2023-07-18 | 中国二冶集团有限公司 | A Prediction Method of Reinforcement Corrosion Parameters Based on Support Vector Machine |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201788000U (en) * | 2010-08-17 | 2011-04-06 | 中国南方航空工业(集团)有限公司 | Flow measuring device and float thereof |
| CN203692107U (en) * | 2014-02-17 | 2014-07-09 | 山东商业职业技术学院 | Multi-head constant flowing flower pot drip irrigation device |
| CN103983558A (en) * | 2014-04-16 | 2014-08-13 | 深圳大学 | Determination apparatus and determination method for reinforcing steel bar corrosion rate |
| CN104709802A (en) * | 2015-03-13 | 2015-06-17 | 重庆交通大学 | Elevator lifted by adopting ship lock water delivery theory and operation control method thereof |
| CN206311457U (en) * | 2016-12-26 | 2017-07-07 | 深圳大学 | The automatic testing equipment that a kind of Corrosion Reinforcement section is axially distributed |
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2016
- 2016-12-26 CN CN201611217580.5A patent/CN106769602B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201788000U (en) * | 2010-08-17 | 2011-04-06 | 中国南方航空工业(集团)有限公司 | Flow measuring device and float thereof |
| CN203692107U (en) * | 2014-02-17 | 2014-07-09 | 山东商业职业技术学院 | Multi-head constant flowing flower pot drip irrigation device |
| CN103983558A (en) * | 2014-04-16 | 2014-08-13 | 深圳大学 | Determination apparatus and determination method for reinforcing steel bar corrosion rate |
| CN104709802A (en) * | 2015-03-13 | 2015-06-17 | 重庆交通大学 | Elevator lifted by adopting ship lock water delivery theory and operation control method thereof |
| CN206311457U (en) * | 2016-12-26 | 2017-07-07 | 深圳大学 | The automatic testing equipment that a kind of Corrosion Reinforcement section is axially distributed |
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