CN105547856A - Concrete material high temperature bending test machine and high temperature bending test method - Google Patents
Concrete material high temperature bending test machine and high temperature bending test method Download PDFInfo
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- CN105547856A CN105547856A CN201510959841.XA CN201510959841A CN105547856A CN 105547856 A CN105547856 A CN 105547856A CN 201510959841 A CN201510959841 A CN 201510959841A CN 105547856 A CN105547856 A CN 105547856A
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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
- G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
Abstract
The present invention provides a concrete material high temperature bending test machine and high temperature bending test method, and the concrete material high temperature bending test machine includes a loading device for applying pressure to a concrete specimen, a heating device for heating the concrete specimen and a displacement collection device for measuring the amount of deformation of the concrete specimen. The concrete material high temperature bending test machine ingeniously combines the loading device and the heating device, and is additionally provided with the displacement collection device, a comprehensive test system used for concrete specimen high temperature bending tests is formed, a real environment of concrete at high temperature can be simulated by collaborative heating and loading and synchronous loading and measurement, results obtained by concrete material tests in the concrete material high temperature bending test machine are very close to actual bending property of the concrete at high temperature in a fire, and a guarantee is provided for study on high temperature and fire resistance performance of a concrete material.
Description
Technical field
The present invention relates to a kind of concrete material testing machine for mechanical properties, especially a kind of testing machine for rupture strength and bent toughness in the material at high temperature such as normal concrete, fiber concrete, regeneration concrete, high-strength concrete; Also relate to the mechanical test method of concrete material, especially the test method of rupture strength and bent toughness in concrete high temperature.
Background technology
Concrete is the building materials that in engineering construction, purposes is the widest, consumption is maximum.In recent years, along with concrete material high-rise, towering, greatly across etc. the going deep into of particular service requirement and harsh and unforgiving environments application, new requirement is proposed to concrete material high temperature fire resistance, is badly in need of corresponding high-temperature test facility to research and develop the high temperature fire resistance of concrete material.Temperature elevation system and the loading system of existing concrete hot bend test equipment are separated often, Bending Concrete performance test in proper high temperature can not be carried out, Bending Concrete performance test in Bending Concrete performance test and approximate high temperature can only to be carried out after high temperature.After high temperature, Bending Concrete performance test is put in heating device by concrete material to heat, and stops heating after reaching desired value, loads after concrete material cooling on loading equipemtn.In approximate high temperature, Bending Concrete performance test is then after concrete temperature in heating device reaches desired value, to be put on Apparatus for Bending at low-temp by the concrete material being in the condition of high temperature immediately to load with instruments such as special high temperature-resistant pliers.Find in practical application, no matter be bending test after high temperature, or bending test in approximate high temperature, in the concrete high temperature of gained, in bending test result and high temperature of fire, the bending property of concrete reality all has larger difference.
In order to solve above Problems existing, people are seeking a kind of desirable technical solution always.
Summary of the invention
Technician, through long research of technique, finds the reason producing the problems referred to above finally.The reason that concrete hot bend test result differs greatly with the bending property of concrete reality in high temperature of fire is: in concrete high temperature, the temperature elevation system of bending test equipment is separated with loading system, can not realize heating up and working in coordination with of loading, during loading the temperature of concrete sample always in various degree lower than target temperature during heating, concrete sample is in temperature-fall period, outside cooling is fast, internal cooling is slow, thus produce thermal stress gradient, cause the stress damage of concrete material, and then make concrete actual flexion performance in obtained experimental result and high temperature of fire produce difference.For Bending Concrete performance test after high temperature, during loading, the temperature of concrete sample is down to normal temperature, and thermal stress damage clearly.For Bending Concrete performance test in approximate high temperature, although concrete sample loads after taking out from heating device immediately, temperature declines less, but environment temperature during owing to loading is far below the temperature in heating device, the thermal stress gradient of concrete sample is comparatively large, and thermal stress damage is very important equally.In addition, in the process of research and development, technician also runs into a technical matters, and the displacement meter namely measuring concrete deformation amount is put into heating device and can be burned.
In addition, according to the existing relevant test methods standards and norms of China, concrete material performance (such as, compressive strength) be determine according to the test findings of lower 3 concrete samples of the same terms, therefore, the problem that 3 identical concrete samples heat up and load under same high temperature environment must be solved.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is: Apparatus for Bending at low-temp in concrete material high temperature, comprises for executing stressed loading equipemtn to concrete sample, for heating the heating device of concrete sample and the displacement acquisition device for measuring concrete sample bending deformation quantity;
Described loading equipemtn comprises base, be fixed on the column on this base, to be located on described column and to move up and down and the crossbeam of locating along described column, be fixed on the top board bottom crossbeam, be fixed on the high temperature resistant seaming chuck bottom top board, be located at the lower platen on described base, be located at the high temperature resistant push-down head on described lower platen, be located at the high temperature resistant cushion block on described push-down head and the loading power source for applying upwards acting force to described lower platen, the lower end of described high temperature resistant seaming chuck be arranged two in parallel for executing stressed strip convex part downwards in the middle part of concrete sample, the upper end of described high temperature resistant cushion block be arranged two in parallel for upwards executing stressed strip convex part to concrete sample both ends, strip convex part on strip convex part on described high temperature resistant seaming chuck and described high temperature resistant cushion block be arranged in parallel and common four fulcrums formed for applying acting force to concrete sample,
The heater that described heating device comprises high temperature furnace bracing frame, is located at the high temperature furnace on this high temperature furnace bracing frame and is located in high temperature furnace, described high temperature furnace is between described top board and described lower platen, the top board of described high temperature furnace arranges the upper perforation penetrating high temperature furnace inside for described high temperature resistant seaming chuck downwards, the base plate of described high temperature furnace arranges the lower perforation upwards penetrating high temperature furnace inside for described high temperature resistant push-down head, and described upper perforation and described lower perforation in the vertical direction are just to setting;
Described displacement acquisition device comprises three displacement meters be located on described high temperature resistant seaming chuck, gather the displacement meter collecting cassette of the information of three described displacement meters, two end guide rod structures and middle part guide rod structure, the center pit of the described high temperature resistant seaming chuck that the high temperature resistant guide rod in the vertical direction of described middle part guide rod structure slides through gos deep in high temperature furnace, the high temperature resistant guide rod of end guide rod structure described in two gos deep into downwards in high temperature furnace from the both sides of described high temperature resistant seaming chuck respectively, high temperature furnace top is provided with the pilot hole passed for each described high temperature resistant guide rod, be located at the described displacement meter of high temperature resistant seaming chuck both sides and corresponding described end guide rod structure top press fit for measuring the deflection at concrete sample two ends, be located at described displacement meter on described top board and the guide rod structure top press fit of described middle part for measuring the deflection in the middle part of concrete sample.
Preferably, described high temperature resistant seaming chuck comprises the seaming chuck bearing be fixedly arranged on described top board and the seaming chuck body be fixedly arranged on described seaming chuck bearing, described high temperature resistant push-down head comprises the push-down head bearing be fixedly arranged on described lower platen and the push-down head body be fixedly arranged on described push-down head bearing, and corresponding described strip convex part is positioned on described seaming chuck body.
Preferably, described column top is provided with screw thread, and the two ends on described crossbeam are rotated and are provided with nut, and described crossbeam is provided with the motor for driving nut rotation described in two, and described crossbeam is by realizing moving up and down and locating with the threaded engagement of described column.
Preferably, described heating device also comprises temperature control system and is located at the temperature sensor in described high temperature furnace, and described heater is globar, and described temperature control system is connected with described temperature sensor sampling, and described temperature control system is electrically connected with described Elema.
Preferably, described end guide rod structure comprise be located at described seaming chuck bearing bottom surface on and there is the described high temperature resistant guide rod that described stage clip bottom is located at the spring base of stage clip and top, the outside of described spring base is in axial direction provided with guide slit, the upper end of described high temperature resistant guide rod arranges horizontal pressing plate, described horizontal pressing plate slide be plugged in guide slit and this horizontal pressing plate for the probe portion top press fit with corresponding described displacement meter, high temperature resistant guide rod described in two respectively with the described strip convex part on high temperature resistant push-down head just to setting; Described middle part guide rod structure comprises the lever be rotatably connected on described high temperature resistant seaming chuck, the described high temperature resistant guide rod being located at lever inner end and extension spring, the upper/lower terminal of described extension spring is individually fixed on lever outer end and described top board, the probe portion top press fit of described lever outer end and corresponding described displacement meter.
Preferably, also comprise thrust unit comprise be located at described high temperature furnace plate inner surface on and with the vertically disposed high temperature resistant guide rail of fire door, slide the catch bar that is inserted on high temperature furnace sidewall and drive the reciprocating power source of described catch bar, the bottom of described high temperature resistant cushion block is provided with the chute coordinated with described high temperature resistant slide, and described catch bar slides on described high temperature resistant slide rail for promoting described high temperature resistant cushion block.
Preferably, described power source comprises electric machine support and is located at the motor on electric machine support, described electric machine support comprises and is arranged at the horizontally disposed leading screw of on rear side of described high temperature furnace two, and motor drives with the screw on described leading screw and is connected, and leading screw is other is provided with rule.
Preferably, also comprise computing machine, described computing machine is connected the displacement signal for gathering displacement meter collecting cassette with described displacement meter collecting cassette information, and described computing machine and testing machine control box control linkage are to apply upwards acting force by testing machine control box controlled loading power source to described lower platen and the load signal that feeds back of acceptance test machine control enclosure.
Utilize Apparatus for Bending at low-temp in concrete high temperature concrete to be carried out to the method for bending test in high temperature, it is characterized in that comprising the steps:
test 3 concrete samples used are put on the high temperature resistant cushion block in high temperature furnace;
open fire door, the high temperature resistant cushion block 3 being placed with concrete sample along the high temperature resistant guide rail in high temperature furnace shifts high temperature furnace body of heater the inside onto, i.e. position shown in Fig. 2, now outmost 1st concrete sample is just positioned at the loading position that directly can load and carry out testing;
close high temperature furnace fire door, set temperature Protonation constant on temperature control system, i.e. programming rate and constant temperature time, and start heating;
after the target temperature that stove inner concrete test specimen reaches regulation and constant temperature time, start-up loading equipment, makes lower platen move up, stop after push-down head body jack-up is high temperature resistant cushion block, start crossbeam, top board is moved down, stop when seaming chuck body contacts with concrete sample;
the position of adjustment displacement meter and high temperature resistant guide rod, makes three high temperature resistant guide rods withstand the mid point of concrete sample upper surface and two fulcrum places at both ends respectively;
pressure-loaded system is set on computers and starts to load; Now lower platen constantly can move up according to the loading velocity of setting, and transfer the load on concrete sample by push-down head bearing, push-down head body and high temperature resistant cushion block successively, three displacement meters measure the displacement of concrete sample two fulcrum and midpoint respectively, and the difference of two fulcrum place moving averages and midpoint displacement is amount of deflection and the bending deformation quantity of concrete sample;
1st concrete sample stores test figure after loading and terminating; Then move down lower platen, high temperature resistant cushion block to fall back on guide rail and push-down head body and high temperature resistant cushion block disengage rear stop mobile; Then move up crossbeam, and 3 high temperature resistant guide rods and concrete sample disengage rear stopping and moving;
start the power source of thrust unit, high temperature resistant cushion block moves along guide rail to fire door direction under the effect of catch bar, moves to after loading position stop moving until the 2nd concrete sample;
repeat step
~
, the 2nd concrete sample is loaded; Loading terminates rear repetition step
~
, the 3rd concrete sample is moved to loading position, again repeats step
~
, the 3rd concrete sample is loaded;
after 3 whole loadeds of concrete sample, lower platen falls back to the end, then closes loading equipemtn and high temperature furnace, and opens fire door, and take out in stove after concrete sample cooling, test completes.
Hinge structure of the present invention has substantive distinguishing features and progress, specifically, Apparatus for Bending at low-temp in concrete material high temperature, by the heating device of concrete test with loading equipemtn is ingenious combines, and be aided with displacement acquisition device, define the comprehensive test system that can be used for bending test in concrete sample high temperature, high temperature furnace is located between top board and lower platen by high temperature furnace bracing frame, on high temperature furnace is provided with, lower perforation and pilot hole etc., make high temperature resistant on, push-down head and the deep enough high temperature furnace inside of high temperature resistant guide rod energy, achieve heat up with loading synchronous, can concrete true environment in simulated fire high temperature truly, measure the length travel amount of concrete sample two fulcrum and central spot respectively, solve the problem that displacement meter can not be used in hot environment to measure concrete sample distortion well, the bending property of concrete reality in test findings that in concrete material high temperature, bending test draws and high temperature of fire is carried out closely, for the high temperature and fire resistance studying concrete material provides guarantee by Apparatus for Bending at low-temp in this concrete material high temperature.
Further, column top is provided with screw thread, and crossbeam is by realizing moving up and down and locating with the threaded engagement of column, and structure is simple, very easy to use.
Further, heating device also comprises temperature control system and is located at the temperature sensor in high temperature furnace, also automatically can keep design temperature by design temperature according to demand.
Further, thrust unit, high temperature resistant cushion block in high temperature furnace can be moved forward and backward, thus reach and once heat up, successively to the object that 3 concrete sample high temperature load, meet the requirement of 1 group of bending test, 3 test specimens specified in mechanical performance of concrete test method standard.
Further, the movement of high temperature resistant guide rod is converted into the movement of displacement meter probe portion by guide rod structure dexterously, and displacement meter can be located at outside high temperature furnace, prevents displacement meter be subject to high temperature failure or be subject to temperatures involved and affect measuring accuracy.
Further, power source comprises electric machine support and is located at the motor on electric machine support, electric machine support comprises and is arranged at the horizontally disposed leading screw of on rear side of described high temperature furnace two, motor drives with the screw on described leading screw and is connected, motor is mobile very convenient on leading screw, leading screw is other is provided with rule, for monitoring the distance of motor and catch bar movement.
Further, computing machine is connected the displacement signal for gathering displacement meter collecting cassette with displacement meter collecting cassette information, and computing machine and testing machine control box control linkage are to apply upwards acting force by testing machine control box controlled loading power source to lower platen and the load signal that feeds back of acceptance test machine control enclosure.
Of the present inventionly Apparatus for Bending at low-temp in concrete material high temperature is utilized concrete to be carried out to the method for bending test in high temperature, Apparatus for Bending at low-temp in concrete high temperature can be utilized, simply complete bending test in concrete high temperature efficiently, for the high temperature and fire resistance studying concrete material provides guarantee.
Accompanying drawing explanation
Fig. 1 is the main TV structure schematic diagram of Apparatus for Bending at low-temp in high temperature in the embodiment of the present invention.
Fig. 2 is the side-looking structural representation of Apparatus for Bending at low-temp in high temperature in the embodiment of the present invention.
Fig. 3 is the enlarged drawing at Figure 1A place.
Embodiment
Below by embodiment, technical scheme of the present invention is described in further detail.
Apparatus for Bending at low-temp in concrete material high temperature, as shown in FIG. 1 to 3, comprise for concrete sample is executed stressed loading equipemtn, for heat concrete sample heating device, for measure concrete sample deflection displacement acquisition device and for promoting the thrust unit that concrete sample moves to fire door direction, loading equipemtn comprises base 6, be fixed on the column 7 on this base 6, to be located on column 7 and to move up and down and the crossbeam 9 of locating along column 7, be fixed on the top board 10 bottom crossbeam, be fixed on the high temperature resistant seaming chuck bottom top board, be located at the lower platen 11 on base 6, be located at the high temperature resistant push-down head on lower platen 11, be located at the high temperature resistant cushion block 18 on described push-down head and the loading power source for applying upwards acting force to lower platen 11, the lower end of high temperature resistant seaming chuck be arranged two in parallel for executing stressed strip convex part 32 in the middle part of concrete sample downwards, the upper end of high temperature resistant cushion block 18 be arranged two in parallel for upwards executing stressed strip convex part 21 to concrete sample both ends, strip convex part 32 on high temperature resistant seaming chuck and the strip convex part 21 on high temperature resistant cushion block 18 be arranged in parallel and jointly form four fulcrums for applying acting force to concrete sample 20, column 7 upper end is connected by cross bar 8 to increase stability, 1 column 7 top is provided with screw thread, two ends on crossbeam 9 are rotated and are provided with nut (not shown), crossbeam 9 is provided with the motor (not shown) for driving nut rotation described in two, and crossbeam 9 is by realizing moving up and down and locating with the threaded engagement of column 7.High temperature resistant seaming chuck comprises the seaming chuck bearing 16 be fixedly arranged on top board 10 and the seaming chuck body 14 be fixedly arranged on seaming chuck bearing 16, high temperature resistant push-down head comprises the push-down head bearing 17 be fixedly arranged on lower platen 11, the push-down head body 15 be fixedly arranged on push-down head bearing 17, strip convex part lays respectively on seaming chuck body 14 and high temperature resistant cushion block 18, high temperature resistant seaming chuck and high temperature resistant push-down head are made by silicon nitride combined silicon carbide material, have the excellent properties such as high rigidity, high strength, high temperature resistant and high temperature creep-resisting; The temperature sensor 4 that heating device comprises high temperature furnace bracing frame 2, is located at the high temperature furnace 1 on this high temperature furnace bracing frame 2, the heater be located in high temperature furnace, temperature control system 5 and is located in high temperature furnace, heater is globar, U-shaped globar 3 is specially in the present embodiment, temperature control system 5 is sampled with temperature sensor 4 and is connected, temperature control system 5 is electrically connected with U-shaped globar, temperature sensor 4 is corundum thermopair, the front end of high temperature furnace body of heater has fire door 28, for taking, putting concrete sample 20, fire door has 2 small sircle holes, observes situation in stove for when heating and test.High temperature furnace 1 is between top board 10 and lower platen 17, the top board of high temperature furnace arranges the upper perforation penetrating high temperature furnace inside for high temperature resistant seaming chuck downwards, the base plate of high temperature furnace arranges the lower perforation upwards penetrating high temperature furnace inside for high temperature resistant push-down head, and upper perforation and lower perforation in the vertical direction are just to setting, displacement acquisition device comprises three displacement meters be located on high temperature resistant seaming chuck, gather the displacement meter collecting cassette 23 of the information of three displacement meters, two end guide rod structures and middle part guide rod structure, the center pit of high temperature resistant seaming chuck that high temperature resistant guide rod 35 in the vertical direction of middle part guide rod structure slides through gos deep in high temperature furnace 1, the high temperature resistant guide rod 24 of two end guide rod structures gos deep in high temperature furnace 1 downwards from the both sides of high temperature resistant seaming chuck respectively, high temperature furnace top is provided with for each high temperature resistant guide rod 24, 35 pilot holes passed, the displacement meter 22 being located at high temperature resistant seaming chuck both sides with corresponding end guide rod structure top press fit for measuring the deflection at concrete sample two ends, be located at displacement meter on top board 10 33 with middle part guide rod structure top press fit for measuring the deflection in the middle part of concrete sample.End guide rod structure to comprise on the bottom surface being located at and comprising and be located at seaming chuck bearing 16 and has the high temperature resistant guide rod 24 that stage clip bottom is located at the spring base 30 of stage clip 29 and top, the outside of spring base 30 is in axial direction provided with guide slit, two high temperature resistant guide rods 24 respectively with the strip convex part on high temperature resistant push-down head just to setting, the upper end of high temperature resistant guide rod 24 arranges horizontal pressing plate 31, horizontal pressing plate 31 slide be plugged in guide slit and this horizontal pressing plate 31 for the probe portion top press fit with corresponding displacement meter 22, concrete, displacement meter is located on the sidewall of seaming chuck bearing 16 both sides, middle part guide rod structure comprises the lever 34 be rotatably connected on high temperature resistant seaming chuck, the high temperature resistant guide rod 35 being located at lever inner end and extension spring 36, the upper/lower terminal of extension spring 36 is individually fixed on lever outer end and top board 10, the probe portion top press fit of lever outer end and corresponding displacement meter 33, displacement meter 22 is grating displacement meter.Thrust unit comprise be located at high temperature furnace 1 plate inner surface on and high temperature resistant guide rail 19 vertically disposed with fire door 28, slide the catch bar 25 and the reciprocating power source of driving catch bar 25 that are inserted on high temperature furnace sidewall, the bottom of high temperature resistant cushion block 18 is provided with the chute be slidably matched with high temperature resistant guide rail 19, catch bar slides on high temperature resistant slide rail 19 for promoting high temperature resistant cushion block 18, power source comprises electric machine support 27 and is located at the motor 26 on electric machine support 27, electric machine support comprises and is arranged at the horizontally disposed leading screw of on rear side of high temperature furnace two, motor drives with the screw on described leading screw and is connected, leading screw is other is provided with rule.Computing machine is connected the displacement signal for gathering displacement meter collecting cassette with displacement meter collecting cassette information, computing machine 13 applies upwards acting force with testing machine control box 12 control linkage so that by testing machine control box 12 controlled loading power source to lower platen 17 and the load signal that feeds back of acceptance test machine control enclosure 12, and loading power source is hydraulic cylinder.
Apparatus for Bending at low-temp in the concrete material high temperature of the present embodiment, by the heating device of concrete test with loading equipemtn is ingenious combines, and be aided with displacement acquisition device, define the comprehensive test system that can be used for bending test in concrete sample high temperature, high temperature furnace is located between top board and lower platen by high temperature furnace bracing frame, on high temperature furnace is provided with, lower perforation and pilot hole, make high temperature resistant on, push-down head and the deep enough high temperature furnace inside of high temperature resistant guide rod energy, achieve heat up with loading synchronous, can concrete true environment in simulation high temperature of fire, the bending property of concrete reality in test findings that in concrete material high temperature, bending test draws and high temperature of fire is carried out closely by Apparatus for Bending at low-temp in this concrete material high temperature, for the high temperature and fire resistance of studying concrete material provide guarantee.Column top is provided with screw thread, and crossbeam is by realizing moving up and down and locating with the threaded engagement of column, and structure is simple, very easy to use.Heating device also comprises temperature control system and is located at the temperature sensor in high temperature furnace, also automatically can keep design temperature by design temperature according to demand.Thrust unit, high temperature resistant cushion block in high temperature furnace can be moved forward and backward, thus reach and once heat up successively with the object loaded 3 concrete sample high temperature, meet the requirement of 1 group of bending test, 3 test specimens specified in mechanical performance of concrete test method standard.The movement of high temperature resistant guide rod is converted into the movement of displacement meter probe portion by guide rod structure dexterously, and displacement meter can be located at outside high temperature furnace, prevents displacement meter be subject to high temperature failure or be subject to temperatures involved and affect measuring accuracy.Power source comprises electric machine support and is located at the motor on electric machine support, electric machine support comprises and is arranged at the horizontally disposed leading screw of on rear side of described high temperature furnace two, motor drives with the screw on described leading screw and is connected, motor is mobile very convenient on leading screw, leading screw is other is provided with rule, for monitoring the distance of motor and catch bar movement.Computing machine is connected the displacement signal for gathering displacement meter collecting cassette with displacement meter collecting cassette information, and computing machine and testing machine control box control linkage are to apply upwards acting force by testing machine control box controlled loading power source to lower platen and the load signal that feeds back of acceptance test machine control enclosure.
In other embodiments, with above-described embodiment unlike, crossbeam can also be fixed by jackscrew, high temperature resistant seaming chuck and high temperature resistant push-down head column integrative-structure, end guide rod structure is high temperature resistant guide rod and now the probe portion of the displacement meter of high temperature resistant seaming chuck both sides directly connects high temperature resistant guide rod; In other embodiments, with above-described embodiment unlike, power source can also be electric pushrod or pneumatic cylinder etc.
Utilize Apparatus for Bending at low-temp in concrete high temperature concrete to be carried out to the method for bending test in high temperature, comprise the steps:
test 3 concrete samples used are put on the high temperature resistant cushion block in high temperature furnace;
open fire door, the high temperature resistant cushion block 3 being placed with concrete sample along the high temperature resistant guide rail in high temperature furnace shifts high temperature furnace body of heater the inside onto, i.e. position shown in Fig. 2, now outmost 1st concrete sample is just positioned at the loading position that directly can load and carry out testing;
close high temperature furnace fire door, set temperature Protonation constant on temperature control system, i.e. programming rate and constant temperature time, and start heating;
after the target temperature that stove inner concrete test specimen reaches regulation and constant temperature time, start-up loading equipment, makes lower platen move up, stop after push-down head body jack-up is high temperature resistant cushion block, start crossbeam, top board is moved down, stop when seaming chuck body contacts with concrete sample;
the position of adjustment displacement meter and high temperature resistant guide rod, makes three high temperature resistant guide rods withstand the mid point of concrete sample upper surface and two fulcrum places at both ends respectively;
pressure-loaded system is set on computers and starts to load; Now lower platen constantly can move up according to the loading velocity of setting, and transfer the load on concrete sample by push-down head bearing, push-down head body and high temperature resistant cushion block successively, three displacement meters measure the displacement of concrete sample two fulcrum and midpoint respectively, and the difference of two fulcrum place moving averages and midpoint displacement is amount of deflection and the bending deformation quantity of concrete sample;
1st concrete sample stores test figure after loading and terminating; Then move down lower platen, high temperature resistant cushion block to fall back on guide rail and push-down head body and high temperature resistant cushion block disengage rear stop mobile; Then move up crossbeam, and 3 high temperature resistant guide rods and concrete sample disengage rear stopping and moving;
start the power source of thrust unit, high temperature resistant cushion block moves along guide rail to fire door direction under the effect of catch bar, moves to after loading position stop moving until the 2nd concrete sample;
repeat step
~
, the 2nd concrete sample is loaded; Loading terminates rear repetition step
~
, the 3rd concrete sample is moved to loading position, again repeats step
~
, the 3rd concrete sample is loaded;
after 3 whole loadeds of concrete sample, lower platen falls back to the end, then closes loading equipemtn and high temperature furnace, and opens fire door, and take out in stove after concrete sample cooling, test completes.
The present embodiment utilizes Apparatus for Bending at low-temp in concrete high temperature concrete to be carried out to the method for bending test in high temperature, Apparatus for Bending at low-temp in concrete high temperature can be utilized, simply complete bending test in concrete high temperature efficiently, for the high temperature and fire resistance studying concrete material provides guarantee.。
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; Although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or carry out equivalent replacement to portion of techniques feature; And not departing from the spirit of technical solution of the present invention, it all should be encompassed in the middle of the technical scheme scope of request of the present invention protection.
Claims (9)
1. Apparatus for Bending at low-temp in concrete material high temperature, is characterized in that: comprise for executing stressed loading equipemtn to concrete sample, for heating the heating device of concrete sample and the displacement acquisition device for measuring concrete sample bending deformation quantity;
Described loading equipemtn comprises base, be fixed on the column on this base, to be located on described column and to move up and down and the crossbeam of locating along described column, be fixed on the top board bottom crossbeam, be fixed on the high temperature resistant seaming chuck bottom top board, be located at the lower platen on described base, be located at the high temperature resistant push-down head on described lower platen, be located at the high temperature resistant cushion block on described push-down head and the loading power source for applying upwards acting force to described lower platen, the lower end of described high temperature resistant seaming chuck be arranged two in parallel for executing stressed strip convex part downwards in the middle part of concrete sample, the upper end of described high temperature resistant cushion block be arranged two in parallel for upwards executing stressed strip convex part to concrete sample both ends, strip convex part on strip convex part on described high temperature resistant seaming chuck and described high temperature resistant cushion block be arranged in parallel and common four fulcrums formed for applying acting force to concrete sample,
The heater that described heating device comprises high temperature furnace bracing frame, is located at the high temperature furnace on this high temperature furnace bracing frame and is located in high temperature furnace, described high temperature furnace is between described top board and described lower platen, the top board of described high temperature furnace arranges the upper perforation penetrating high temperature furnace inside for described high temperature resistant seaming chuck downwards, the base plate of described high temperature furnace arranges the lower perforation upwards penetrating high temperature furnace inside for described high temperature resistant push-down head, and described upper perforation and described lower perforation in the vertical direction are just to setting;
Described displacement acquisition device comprises three displacement meters be located on described high temperature resistant seaming chuck, gather the displacement meter collecting cassette of the information of three described displacement meters, two end guide rod structures and middle part guide rod structure, the center pit of the described high temperature resistant seaming chuck that the high temperature resistant guide rod in the vertical direction of described middle part guide rod structure slides through gos deep in high temperature furnace, the high temperature resistant guide rod of end guide rod structure described in two gos deep into downwards in high temperature furnace from the both sides of described high temperature resistant seaming chuck respectively, high temperature furnace top is provided with the pilot hole passed for each described high temperature resistant guide rod, be located at the described displacement meter of high temperature resistant seaming chuck both sides and corresponding described end guide rod structure top press fit for measuring the deflection at concrete sample two ends, be located at described displacement meter on described top board and the guide rod structure top press fit of described middle part for measuring the deflection in the middle part of concrete sample.
2. Apparatus for Bending at low-temp in concrete material high temperature according to claim 1, it is characterized in that: described high temperature resistant seaming chuck comprises the seaming chuck bearing be fixedly arranged on described top board and the seaming chuck body be fixedly arranged on described seaming chuck bearing, described high temperature resistant push-down head comprises the push-down head bearing be fixedly arranged on described lower platen and the push-down head body be fixedly arranged on described push-down head bearing, and corresponding described strip convex part is positioned on described seaming chuck body.
3. Apparatus for Bending at low-temp in concrete material high temperature according to claim 1, it is characterized in that: described column top is provided with screw thread, two ends on described crossbeam are rotated and are provided with nut, described crossbeam is provided with the motor for driving nut rotation described in two, and described crossbeam is by realizing moving up and down and locating with the threaded engagement of described column.
4. Apparatus for Bending at low-temp in concrete material high temperature according to claim 1, it is characterized in that: described heating device also comprises temperature control system and is located at the temperature sensor in described high temperature furnace, described heater is globar, described temperature control system is connected with described temperature sensor sampling, and described temperature control system is electrically connected with described Elema.
5. Apparatus for Bending at low-temp in wanting described in 1 concrete material high temperature according to right, it is characterized in that: described end guide rod structure comprise be located at described seaming chuck bearing bottom surface on and there is the described high temperature resistant guide rod that described stage clip bottom is located at the spring base of stage clip and top, the outside of described spring base is in axial direction provided with guide slit, the upper end of described high temperature resistant guide rod arranges horizontal pressing plate, described horizontal pressing plate slide be plugged in guide slit and this horizontal pressing plate for the probe portion top press fit with corresponding described displacement meter, high temperature resistant guide rod described in two respectively with the described strip convex part on high temperature resistant push-down head just to setting, described middle part guide rod structure comprises the lever be rotatably connected on described high temperature resistant seaming chuck, the described high temperature resistant guide rod being located at lever inner end and extension spring, the upper/lower terminal of described extension spring is individually fixed on lever outer end and described top board, the probe portion top press fit of described lever outer end and corresponding described displacement meter.
6. Apparatus for Bending at low-temp in wanting described in 1 concrete material high temperature according to right, it is characterized in that: also comprise thrust unit comprise be located at described high temperature furnace plate inner surface on and with the vertically disposed high temperature resistant guide rail of fire door, slide the catch bar that is inserted on high temperature furnace sidewall and drive the reciprocating power source of described catch bar, the bottom of described high temperature resistant cushion block is provided with the chute coordinated with described high temperature resistant slide, and described catch bar slides on described high temperature resistant slide rail for promoting described high temperature resistant cushion block.
7. Apparatus for Bending at low-temp in concrete material high temperature according to claim 6, it is characterized in that: described power source comprises electric machine support and is located at the motor on electric machine support, described electric machine support comprises and is arranged at the horizontally disposed leading screw of on rear side of described high temperature furnace two, motor drives with the screw on described leading screw and is connected, and leading screw is other is provided with rule.
8. Apparatus for Bending at low-temp in concrete material high temperature according to claim 7, it is characterized in that: also comprise computing machine, described computing machine is connected the displacement signal for gathering displacement meter collecting cassette with described displacement meter collecting cassette information, and described computing machine and testing machine control box control linkage are to apply upwards acting force by testing machine control box controlled loading power source to described lower platen and the load signal that feeds back of acceptance test machine control enclosure.
9. utilize Apparatus for Bending at low-temp in concrete high temperature concrete to be carried out to the method for bending test in high temperature, it is characterized in that comprising the steps:
test 3 concrete samples used are put on the high temperature resistant cushion block in high temperature furnace;
open fire door, the high temperature resistant cushion block 3 being placed with concrete sample along the high temperature resistant guide rail in high temperature furnace shifts high temperature furnace body of heater the inside onto, i.e. position shown in Fig. 2, now outmost 1st concrete sample is just positioned at the loading position that directly can load and carry out testing;
close high temperature furnace fire door, set temperature Protonation constant on temperature control system, i.e. programming rate and constant temperature time, and start heating;
after the target temperature that stove inner concrete test specimen reaches regulation and constant temperature time, start-up loading equipment, makes lower platen move up, stop after push-down head body jack-up is high temperature resistant cushion block, start crossbeam, top board is moved down, stop when seaming chuck body contacts with concrete sample;
the position of adjustment displacement meter and high temperature resistant guide rod, makes three high temperature resistant guide rods withstand the mid point of concrete sample upper surface and two fulcrum places at both ends respectively;
pressure-loaded system is set on computers and starts to load; Now lower platen constantly can move up according to the loading velocity of setting, and transfer the load on concrete sample by push-down head bearing, push-down head body and high temperature resistant cushion block successively, three displacement meters measure the displacement of concrete sample two fulcrum and midpoint respectively, and the difference of two fulcrum place moving averages and midpoint displacement is amount of deflection and the bending deformation quantity of concrete sample;
1st concrete sample stores test figure after loading and terminating; Then move down lower platen, high temperature resistant cushion block to fall back on guide rail and push-down head body and high temperature resistant cushion block disengage rear stop mobile; Then move up crossbeam, and 3 high temperature resistant guide rods and concrete sample disengage rear stopping and moving;
start the power source of thrust unit, high temperature resistant cushion block moves along guide rail to fire door direction under the effect of catch bar, moves to after loading position stop moving until the 2nd concrete sample;
repeat step
~
, the 2nd concrete sample is loaded; Loading terminates rear repetition step
~
, the 3rd concrete sample is moved to loading position, again repeats step
~
, the 3rd concrete sample is loaded;
after 3 whole loadeds of concrete sample, lower platen falls back to the end, then closes loading equipemtn and high temperature furnace, and opens fire door, and take out in stove after concrete sample cooling, test completes.
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