CN113945471A - Concrete washout test device under load and environment coupling effect - Google Patents

Concrete washout test device under load and environment coupling effect Download PDF

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Publication number
CN113945471A
CN113945471A CN202111383772.4A CN202111383772A CN113945471A CN 113945471 A CN113945471 A CN 113945471A CN 202111383772 A CN202111383772 A CN 202111383772A CN 113945471 A CN113945471 A CN 113945471A
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China
Prior art keywords
test
concrete
environment
load
loading
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Pending
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CN202111383772.4A
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Chinese (zh)
Inventor
张茂花
马大男
崔继印
许荣华
田泽农
杜琳
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Northeast Forestry University
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Northeast Forestry University
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Priority to CN202111383772.4A priority Critical patent/CN113945471A/en
Publication of CN113945471A publication Critical patent/CN113945471A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
    • G01N3/36—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by pneumatic or hydraulic means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D21/00—Measuring or testing not otherwise provided for
    • G01D21/02—Measuring two or more variables by means not covered by a single other subclass
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/56—Investigating resistance to wear or abrasion

Abstract

The invention discloses a concrete scouring test device under the coupling action of load and environment, which is a loading device for truly reflecting the service state of a concrete structure in a marine environment, simulating the environmental characteristics of a marine underwater region, a tidal region, a splash region and a salt spray region, realizing the synchronous coupling action of load and scouring and provides basic equipment for a system and comprehensively developing the research on the durability of concrete under the coupling action of load, environment and scouring.

Description

Concrete washout test device under load and environment coupling effect
Technical Field
The invention relates to a test device for concrete scouring under the coupling action of load and environment.
Background
The concrete engineering structure in the marine environment is not only eroded by the surrounding environment, but also acted by loads (including static loads and dynamic loads) and scouring, the durability and the load and scouring action of marine concrete are inseparable, the existing device generally carries out simulation tests on the static and dynamic load actions, the scouring action and the environment action separately, or only can simulate load and environment coupling, or scour and environment coupling, and the like, and a test device for concrete scouring under the load and environment coupling action is lacked.
Disclosure of Invention
The invention provides a test device for concrete scouring under the coupling action of load and environment based on the technical problems, so as to fill the blank of the field and solve the problems in the background technology.
In view of the above, the invention provides a concrete erosion test device under the coupling action of load and environment, which comprises a loading device, a test box, an erosion device and a control device. The loading device is an electro-hydraulic servo dynamic and static fatigue testing machine and comprises a frame beam, an upright post, a loading oil cylinder, a lifting cylinder, a pressure plate, a first sealing ring, a rolling shaft, an oil pipe, a hydraulic oil pump, a hydraulic motor, a base, a sliding block and a static pedestal. The inspection box comprises an inner layer plate, a flexible heating sheet, a heat insulation layer, an outer layer plate, a handle type door cover, a second sealing ring, a water inlet with a valve, a water outlet with a valve, an air inlet with a valve, a gas concentration sensor, a mist spraying nozzle and a temperature and humidity sensor. The flushing device comprises fan blades, a belt pulley, a rotating belt and a motor. The control device comprises a temperature and humidity, gas concentration and salt spray spraying control system, an oil pressure loading control system, a digital control system and a turbine rotation control system.
In the above technical scheme, preferably, the loading device is made of a corrosion-resistant material and is coated with a corrosion-resistant material, and the loading device is made of a stainless steel material and is coated with a corrosion-resistant paint.
In the above technical solution, preferably, a first sealing ring is arranged at a lap joint of the lifting cylinder and the test box.
In the above technical solution, preferably, the pressure plate is located at the bottom end of the lifting cylinder, and the rolling shaft is located at the bottom of the pressure plate, so that the test span can be adjusted.
In the above technical solution, preferably, the sliding block is fixedly embedded in the sliding groove of the base to limit and support the test block, and the base is located on the static pedestal.
In the above technical solution, preferably, the flexible heating sheet surrounds the middle lower portion of the inner layer plate.
In the above technical solution, preferably, a heat insulating layer is arranged between the inner-layer board and the outer-layer board.
In the above technical solution, preferably, the heat insulating layer is made of a light material.
In the above technical solution, preferably, the water inlet and the air inlet with the valve are located on two sides of the top of the front side of the test chamber.
In the above technical solution, preferably, the drainage ports with valves are located on both sides of the bottom of the front face of the test chamber.
In the above technical solution, preferably, the front surface of the test chamber is provided with a transparent visible handle-type door cover.
In the above technical solution, preferably, the handle-type door cover is made of a transparent anti-corrosion material.
In the above technical solution, preferably, a second seal ring is attached inside the handle-type door cover.
In the above technical solution, preferably, a gas concentration sensor is arranged at the top of the test chamber, and a mist spray nozzle and a temperature and humidity sensor at one side of the test chamber are arranged at the top side of the test chamber.
In the above technical solution, preferably, the bottom of the test chamber has a base, and the base is located on a base of the loading device.
In the above technical solution, preferably, the fan blade is connected to a pulley.
In the technical scheme, preferably, a rotating bearing is attached to the belt pulley, the outer side of the belt pulley is connected with the motor through a rotating belt, a base of a loading device is arranged in the rotating bearing, the belt pulley is driven to rotate through the motor, the fan blades are used for stirring solution and sand in the test box, and the effect of flushing the concrete test block is achieved.
In the above technical scheme, preferably, the belt pulley with the bearing attached inside is located on the outer side of the bottom of the test box, the belt pulley and the test box are connected by welding, and the joint is subjected to seepage prevention and corrosion resistance treatment.
In the above technical solution, preferably, the fan blade is located at the bottom of the inner side of the test chamber, and the motor is located at one side of the loading device base and is fixedly connected with the loading device base.
Compared with the existing test device, the invention has the beneficial effects that:
the invention provides a concrete scouring test device under the coupling action of load and environment, fills the blank of the related field, can simulate the real situation of marine environment through the temperature and humidity, gas concentration and salt spray spraying control system of a test box, applies cyclic load by using a loading device through a quartering method, more accurately measures the fatigue performance parameters of a concrete test piece, and combines a scouring device to realize the actual service situation of marine concrete under the synchronous coupling action of scouring and load in a corrosive sea area.
Drawings
FIG. 1 is a schematic view of the apparatus of the present invention;
FIG. 2 is a schematic sectional view taken along line A-A of FIG. 1;
FIG. 3 is an enlarged view of the point B in FIG. 1;
in the figure, 1, a loading oil cylinder, 2, an oil pipe, 3, a frame beam, 4, an upright post, 5, a water inlet with a valve, 6, an air inlet with a valve, 7, a lifting cylinder, 8, a pressure plate, 9, a first sealing ring, 10, a rolling shaft, 11, a fog spraying nozzle, 12, a temperature and humidity sensor, 13, a second sealing ring, 14, a handle type door cover, 15, a hydraulic oil pump, 16, an inner layer plate, 17, a flexible heating sheet, 18, a heat insulation layer, 19, an outer layer plate, 20, a water outlet with a valve, 21, a test piece, 22, a sliding block, 23, a fan blade, 24, a belt pulley, 25, a rotating belt, 26, a motor, 27, a hydraulic motor, 28, a control device, 29, a base, 30, a static pedestal, 31, a gas concentration sensor and 32 are arranged.
Detailed Description
For better understanding and implementation, the invention/invention will be further described below with reference to specific test cases and drawings, but the invention device is not limited to these embodiments, and any modification or replacement based on the embodiments will still fall within the scope of the invention device claims.
The technical solution of the present invention is further explained with reference to the drawings and the embodiments.
The device is particularly applied to a test device for concrete scouring under the coupling action of cyclic load and environment in a laboratory, and comprises a loading device, a test box, a scouring device and a control device 28.
Referring to fig. 1, 2 and 3, the loading device is an electro-hydraulic servo dynamic and static fatigue testing machine and comprises a loading frame, a loading system, a hydraulic system and a digital control system, wherein the loading frame comprises a frame beam 3, an upright post 4 and a static pedestal 30; the loading system comprises a loading oil cylinder 1 and a lifting cylinder 7, wherein a pressure plate 8 is arranged at the end of the lifting cylinder, the joint of the pressure plate and a test box is sealed by adopting a first sealing ring 9, the pressure plate is provided with a rolling shaft 10, a static force pedestal 30 is a working platform for a concrete test piece loading test and is positioned on a base 29, and a movable slide block 22 is arranged on the static force pedestal 30 and can limit and support the test piece; the hydraulic system comprises an oil pipe 2, a hydraulic oil pump 15 and a hydraulic motor 27, and an electric control cabinet is additionally arranged to control the opening or closing of an oil source and a loading system. The oil source is supplied to the hydraulic device to drive the loading head of the testing machine to perform compression, bending, pulling and other actions; the digital control system mainly comprises a high-precision load sensor and a deformation measurement digital dial indicator for acquiring data, and a computer displays displacement, load deformation and the like, and has the functions of zero clearing, calibration, gain adjustment, peak value keeping and the like.
II, referring to fig. 1 and 2, the test box comprises an environment box and a control monitoring system, the box structure comprises an inner layer plate 16, a flexible heating sheet 17, a heat preservation and insulation layer 18, an outer layer plate 19, a handle type door cover 14, a second sealing ring 13 attached in the handle type door cover, a water inlet 5 with a valve on the front side of the box, an air inlet 6 with a valve, water outlets 20 with valves on the left side and the right side, a gas concentration sensor 31 and a mist spraying nozzle 11 arranged on the top of the box, and a temperature and humidity sensor 12 arranged on the inner side of the box; the control monitoring system comprises a temperature and humidity control panel, a spraying control switch and a gas concentration control panel, wherein the bottom of the whole box body is provided with a base 32 which is located on a base 29 of the testing device.
III, referring to fig. 1 and 2, the flushing device comprises fan blades 23, a belt pulley 24, a rotating belt 25, a motor 26 and a turbine rotation control system, wherein the turbine rotation control system is mainly a control cabinet, and the flushing speed is controlled by a control cabinet switch and a speed adjusting button.
Example (b): and (3) testing the durability of the concrete under the combined action of fatigue load and wave scouring in the marine environment (simulating the durability of the concrete for seaport maritime workers).
Step 1: according to the size and the number of concrete test blocks required by the test, the size of a required test box is determined, except one 100mm multiplied by 400mm surface of the test piece is reserved, other five surfaces are sealed by paraffin, and the test piece to be scoured is saturated with water and weighed.
Step 2: the concrete test piece of 100mm x 400mm after standard maintenance 28d is put into experimental work platform with opening handle formula flap, adjusts slider and rolling axis in order to fix the test piece, pours into a certain amount of grit in the box simultaneously, closes the sealed proof box of flap, pours into certain concentration (this time adopts the Na Cl solution that the concentration is 3.5%) salt solution into the box, and the concrete test piece is totally submerged to solution.
And step 3: respectively finishing the temperature and humidity system and the loading system according to specific embodiments I, II and III, adjusting the temperature control system according to the appropriate temperature required by the test to enable the test temperature to meet the required environmental requirement, then starting the loading device, wherein the test adopts a 100kN fatigue testing machine, the load carrier wave of the fatigue cycle is a sine wave, the frequency of the fatigue testing machine is 0-10 Hz, four frequencies of 0Hz, 2Hz, 5Hz and 10Hz are selected for testing, and the fatigue load stress level is controlled to be sigmamax/σf＝0.5，σmin/σmaxThe test uniformly adopts 200 ten thousand fatigue loads, and if the concrete sample passes 2 multiplied by 10, the fatigue load is 0.256And after the cyclic loading, the concrete sample still keeps undamaged, and the concrete sample is considered to be capable of bearing infinite cyclic loads. Meanwhile, a switch of the control cabinet and a speed adjusting button are turned on to control the flushing speed.
And 4, step 4: and after the specified age is reached, taking out the concrete test block, collecting test data, and repeating the operation steps until the final test is finished.
And 5: after the test is finished, the control switches are closed in sequence, the concrete sample is taken out from the test box body, the drain valve is opened to drain water, and the cover door is opened to clean sand in the box.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (10)

1. The utility model provides a concrete washout test device under load and environment coupling effect which characterized in that: comprises a loading device, a test box, a flushing device and a control device. The loading device is an electro-hydraulic servo dynamic and static fatigue testing machine and comprises a frame beam, an upright post, a loading oil cylinder, a lifting cylinder, a pressure plate, a first sealing ring, a rolling shaft, an oil pipe, a hydraulic oil pump, a hydraulic motor, a base, a sliding block and a static pedestal. The inspection box comprises an inner layer plate, a flexible heating sheet, a heat insulation layer, an outer layer plate, a handle type door cover, a second sealing ring, a water inlet with a valve, a water outlet with a valve, an air inlet with a valve, a gas concentration sensor, a mist spraying nozzle and a temperature and humidity sensor. The flushing device comprises fan blades, a belt pulley, a rotating belt and a motor. The control device comprises a temperature and humidity, gas concentration and salt spray spraying control system, an oil pressure loading control system, a digital control system and a turbine rotation control system.
2. The concrete washout test device under load and environment coupling effect of claim 1, characterized in that: the loading device is made of corrosion-resistant materials and is coated with corrosion-resistant materials, and the loading device is made of stainless steel materials and is coated with corrosion-resistant paint.
3. The concrete washout test device under load and environment coupling effect of claim 2, characterized in that: and a first sealing ring is arranged at the lap joint of the lifting cylinder and the test box.
4. The concrete washout test device under load and environment coupling effect of claim 3, characterized in that: the pressure plate is positioned at the bottom end of the lifting cylinder, and the rolling shaft is positioned at the bottom of the pressure plate, so that the test span can be adjusted.
5. The concrete washout test device under load and environment coupling effect of claim 4, characterized in that: the slide block is fixedly embedded in the sliding groove of the base to limit and support the test block, and the base is positioned on the static pedestal.
6. A concrete washout test device under load and environment coupling effect of claim 5, characterized in that: the water inlet and the air inlet with the valves are positioned on two sides of the top of the front face of the test box, and the water outlet with the valves is positioned on two sides of the bottom of the front face of the test box.
7. The apparatus for testing concrete scouring under the coupling action of load and environment as claimed in claim 6, wherein a transparent and visible handle type door cover is arranged on the front face of the test box, the handle type door cover is made of transparent anti-corrosion material, and a second sealing ring is attached to the inside of the handle type door cover.
8. A load and environment coupled concrete washout test apparatus as claimed in claim 7, wherein said test chamber has a gas concentration sensor at the top, a misting head at the top and a temperature and humidity sensor at one side.
9. A load and environment coupled concrete washout test apparatus as claimed in claim 8, wherein said test chamber has a base at the bottom thereof, said base being located above the base of said loading means.
10. The apparatus according to claim 9, wherein a rotating bearing is attached to the belt pulley, the outer side of the belt pulley is connected to a motor through a rotating belt, a base of the loading device is arranged in the rotating bearing, and the belt pulley is driven to rotate by the motor, so that the solution and sand in the test chamber are stirred by the fan blades, and the effect of washing the concrete test block is achieved.
CN202111383772.4A 2021-11-22 2021-11-22 Concrete washout test device under load and environment coupling effect Pending CN113945471A (en)

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Application Number Priority Date Filing Date Title
CN202111383772.4A CN113945471A (en) 2021-11-22 2021-11-22 Concrete washout test device under load and environment coupling effect

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Application Number Priority Date Filing Date Title
CN202111383772.4A CN113945471A (en) 2021-11-22 2021-11-22 Concrete washout test device under load and environment coupling effect

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114383952A (en) * 2022-01-21 2022-04-22 重庆大学 Multi-field coupled rock mass degradation simulation test system and test method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114383952A (en) * 2022-01-21 2022-04-22 重庆大学 Multi-field coupled rock mass degradation simulation test system and test method

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