CN105277442A - Testing device and method for applying lasting axial tension loads to plurality of concrete test pieces - Google Patents
Testing device and method for applying lasting axial tension loads to plurality of concrete test pieces Download PDFInfo
- Publication number
- CN105277442A CN105277442A CN201510827859.4A CN201510827859A CN105277442A CN 105277442 A CN105277442 A CN 105277442A CN 201510827859 A CN201510827859 A CN 201510827859A CN 105277442 A CN105277442 A CN 105277442A
- Authority
- CN
- China
- Prior art keywords
- distribution beam
- concrete sample
- concrete
- load
- groove
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention provides a testing device for applying lasting axial tension loads to a plurality of concrete test pieces. The testing device comprises at least three counter-force frames, an upper transverse beam, a loading distribution beam, a plurality of connection rods which are connected in series, at least two thread connection rods, four limiting buckles, a gear type jack and a pressure sensor, wherein the thread connection rods penetrate through the upper transverse beam and then are fixed by nuts; the thread connection rods are used for hanging the plurality of concrete test pieces to form a concrete test piece cluster; the loading distribution beam is transversely erected under lower beam rods of the three counter-force frames; the limiting buckles are welded at the two ends of the loading distribution beam; the gear type jack is arranged between the bottom of the lower beam rod of the counter-force frame in the middle and the loading distribution beam; and the pressure sensor is arranged on the gear type jack. According to the testing device provided by the invention, lasting axial tension loads can be simultaneously applied to the plurality of concrete test pieces so that the working amount of a test is reduced; an embedded part can be accurately positioned and the precision of the test can be improved; and the device can be rapidly detached and can be circularly utilized.
Description
Technical field
The present invention relates to technical field of buildings, particularly relate to and a kind ofly lasting axle is applied to multiple early-age concrete test specimen draw the damage test unit of load and method.
Background technology
Early stripping formwork system technology is a kind of novel " Fast-dismantle system ", is in engineering and promotes the use the stage.Should " Fast-dismantle system " be exactly when the concrete that certain one deck is built reaches some strength, under the prerequisite ensureing construction safety, except the vertical rod retained and tear open evening except supporting member, beam bottom mother plate be done sth. in advance dismounting, thus accelerating construction progress.In aluminum current alloy early stripping formwork system technology, the dismounting time of beam slab bed die is mainly with reference to external experience, reaches 36 hours namely remove beam slab bed die in the age of concrete.But whether only having the xoncrete structure in the 36 hour length of time to produce under the effect of construction loads, whether damage and damage thereof can have an impact to the performance of later stage xoncrete structure is one of engineering staff's problem of showing great attention to.For this reason, the elastic modulus, strain-stress relation, cleavage strength etc. of the damage mechanics performance of research early-age concrete after axial tension load action especially after tension damage calculate one of indispensable index such as early-age concrete structural strength, rigidity and stability.
At present, some researchers are research concrete axle center tensile modulus of elasticity, have also carried out some experimental studies.
Following list of references:
[1] Zhang Wenbo, Mao Mingjie, Yang Qiuning, Chen Wei. the uniaxial tension elastic modulus of flyash concrete. science and technology and journey, 2015,15 (9): 225-229.
[2] pacify bright, Yang Zhihui, remaining self-possessed, Zhai Yanfeng, Gao Kang. the research of RPC tensile property. railway society, 2010,32 (1): 54-58.
[3] Chen Meng, Bi Suping, Liu Lixin, Peng Shaomin. the experimental study of commerical ready-mixed concrete axial tensile strength and tension elastic modulus. Sichuan architecture science is studied, and 34 (2): 186-189.
[4] Mei Guodong, Xu Lihua, Lu Weimiao, Huang Le. fibers content is to the impact analysis of hybrid fiber concrete axle center tensile property. Wuhan University Journal (engineering version), 2013,46 (6): 752-758.
[5] Han Xuecai, Xu Jiawen. the tensile property experimental study of rubber regeneration concrete axle center. Institutes Of Technology Of Taiyuan's journal, 2014,45 (6): 799-802.
Zhang Wenbo (2015) [1] adopts at the pre-buried deformed bar in prism center, reinforcing bar and concrete adhesive property is utilized to apply axle center pulling force to concrete, thus measure concrete uniaxial tension elastic modulus, as shown in Figure 1, the pre-buried deformed bar tension in cylinder center test unit.Number in the figure annotates: screw cutting-1, coheres end-2, reinforcing bar foil gauge-3, concrete strain sheet-4, test specimen central authorities-5, double-sided belt rib reinforcement-6.
Pacify bright (2010) [2] to adopt and be positioned on chuck carry out axial tension test by falling the concrete sample of 8 fonts, as shown in Figure 2, chuck carries out axial tension test unit.Number in the figure annotates: cruciform bracing-1, grip nut-2, framework pull bar-3, chuck-4, vertical rod-5.
Chen Meng (2008) [3] test specimen adopts pre-buried rod-pulling type, and test specimen two ends respectively set a 230mm length, diameter as the HRB335 reinforcing bar of 12mm is as pull bar, and pulling force is delivered in concrete sample by embedded bar.As shown in Figure 3, pre-buried rod-pulling type axis pulling experiment installation drawing.Number in the figure annotates: 1-HRB335 reinforcing bar.
Mei Guodong (2013) [4] adopt at test piece end built-in type dumb-bell shape test specimen, and adopt fine thread screw mandrel to connect, and are connected with ball pivot by cage with the chuck of universal testing machine, apply axle center pulling force.As shown in Figure 4, test piece end built-in type dumb-bell shape test specimen.Number in the figure annotates: universal test machine grip holder-1, ball pivot-2, steel plate-3, spherical nut-4, dynamometry steel pole-5, data acquisition system (DAS)-6, foil gauge-7, extensometer-8.
After the end of the dumbbell shape concrete sample that Han Xuecai (2014) [5] large centre, two is little adopts adhesive glue and steel plate (band pull bar) to bond, carry out axle center tensile test being clamped in testing machine.As shown in Figure 5, be clamped in testing machine and carry out axle center tensile test.Number in the figure annotates: upper connecting rod-1, upper arm-tie-2, dumbbell shape test specimen-3, lower pulling plate-4, lower link-5.
The shortcoming that existing concrete prism axial tension exists is:
1. the method for variable cross section, test specimen makes and comparatively bothers, and needs to make corresponding template, causes test specimen error in physical dimension comparatively large, and then causes eccentric force.
2. installation of embedded parts, time-consumingly to take a lot of work.Embedded bar requires accurately to bury underground, is that the coupling bolt before preliminary work, making test specimen or test is all cumbersome; Bonding rule requires that the adhesive surface of test specimen will process meticulously, and the sclerosis of cementing agent also needs the regular hour, then inapplicable for the test playing mould after the damage of early-age concrete test specimen and damage.
3. can only test single concrete sample, experiment work amount is heavy.And due to concrete discreteness comparatively large, one group of test specimen often needs to carry out test of many times, if one by one lasting damage load is applied to concrete sample, then the workload tested is very huge.And adopt multiple test specimen to test simultaneously, tricks and the workload of test unit can be reduced.
4. lasting axial load can not be applied to concrete sample.Current test concrete sample being applied to axial tension is disposable failure test mostly.
Summary of the invention
One of the technical problem to be solved in the present invention, is that providing a kind of applies to multiple concrete sample the test unit that lasting axle draws load, reduces the workload of test; And can remove by fast dismantling, turnover uses.
One of problem of the present invention is achieved in that and a kind ofly applies to multiple concrete sample the test unit that lasting axle draws load, and described test unit comprises: at least three reaction frames, entablatures, load distribution beam, multiple serial connection connecting link, at least two whorl brace rods, four spacing fasteners, a gear type jack, a pressure transducer and pressure sensor readings instrument; Described three reaction frame side by side parallel are arranged, and described entablature is erected at the top of three reaction frames; Described whorl brace rod is fixed by nut through after entablature, and whorl brace rod is positioned at the centre of adjacent two reaction frames; Described whorl brace rod hangs multiple concrete samples, form a concrete sample string, described whorl brace rod afterbody is connected with first concrete sample in concrete sample string, connected by described serial connection connecting link between adjacent two concrete samples, in concrete sample string, last concrete sample is connected with the bayonet socket in described loading distribution beam by serial connection connecting link; Described loading distribution beam transverse strands is located at below the lower beam column of three reaction frames, arranges described gear type jack bottom the lower beam column of middle reaction frame and between loading distribution beam; Spacing fastener is welded in the top flange loading distribution beam two ends between two; Described pressure transducer is arranged on gear type jack, and described pressure sensor readings instrument is connected with described pressure transducer.
Further, it is identical that described distribution beam stop means comprises two structures, and symmetrically arranged limit assembly, described limit assembly comprises: the vertical rod of two band grooves, two pulleys and a depression bar; Described spacing fastener is set in vertical rod, and described depression bar is erected between two spacing fasteners, and described loading distribution beam is positioned at below depression bar, and between two vertical rods; Described pulley is installed in the both sides of described loading distribution beam, and allows in the groove of the vertical vertical rod of pulley in distribution beam stop means and move.
Further, described concrete sample comprises a test specimen mould, two connection draw-in grooves and a cruciform card slot type fixed mount; Described two connection draw-in grooves are symmetricly set in test specimen mould; Described connection draw-in groove comprises the steel plate layer with bayonet, structural adhesive layer and the concrete layer that set gradually; Described cruciform card slot type fixed mount comprises a long limit and a minor face, and described minor face both ends all arrange a draw-in groove, the draw-in groove that both ends, long limit are arranged before and after being provided with two; Two draw-in grooves of described minor face are connected with left and right two wall of test specimen mould, and two front bayonet slots on described long limit are connected with front and back two wall of test specimen mould, and after two of long limit, connection draw-in groove is fixed spacing in test specimen mould by draw-in groove.
Further, described loading distribution beam is " work " font.
Further, the afterbody of described whorl brace rod is provided with " one " font positive stop strip.
Further, the rear and front end of described serial connection connecting link is provided with " one " font positive stop strip.
The technical problem to be solved in the present invention two, be that providing a kind of applies to multiple concrete sample the test method that lasting axle draws load, the test unit in the method can carry out fast dismantling and remove, and can carry out turnover and use; The method reduce and the workload that lasting axle draws damage load is applied to concrete sample.
Two of problem of the present invention is achieved in that and a kind ofly applies to multiple concrete sample the test method that lasting axle draws load, described method need provide a test unit, and this test unit comprises: at least three reaction frames, an entablature, one load distribution beam, multiple serial connection connecting link, at least two whorl brace rods, a distribution beam stop means, four spacing fasteners, a gear type jack, a pressure transducer and pressure sensor readings instrument;
Described method specifically comprises the steps:
Step 1, make the concrete sample in multiple length of time morning;
Step 2, described experimental provision is installed, and pulling force is applied to each concrete sample; This step 2 is specially: be connected by the entablature of whorl brace rod with reaction frame top, connected mode is by the upper and lower preformed hole at entablature, whorl brace rod is fixed by nut through rear one end, and utilize nut to make loading distribution beam maintenance level to regulate the height of the right and left concrete sample string, connection draw-in groove in the whorl brace rod other end and concrete sample connects, and hangs concrete sample; Connected by serial connection connecting link and described connection draw-in groove between each concrete sample, form a concrete sample string, and by adjusting the position of the connection draw-in groove in concrete sample, ensure that each concrete sample is on same perpendicular line, the bottom of concrete sample string adopts serial connection connecting link to be connected with the bayonet socket loaded in distribution beam, the lower beam column of three reaction frames arranges distribution beam stop means to be undertaken spacing by loading distribution beam, and spacing fastener is welded in the top flange loading distribution beam two ends between two; Apply downward pressure to loading distribution beam by gear type jack, apply pulling force namely indirectly to the concrete string on both sides, the equal pulling force that both sides string concrete sample is subject to, pulling force size is the half of jack pressure;
Step 3, lasting axle is applied to multiple early-age concrete test specimen draw load; This step 3 is specially: apply to concrete sample the tension load that size is Ultimate Tensile bearing capacity about 8%-12%, check whether each part of experimental provision can normally work, and then unloads; Axle according to drafting applying draws load, adopt the very heavy load application of gear type and utilize pressure transducer and pressure sensor readings instrument directly to read apply load; When in loading procedure due to test piece deformation is inconsistent or Influence from Eccentric time, namely load distribution beam to occur tilting, when the pulley loaded in distribution beam contacts with the groove walls of distribution beam stop means, then by the nut of the connecting thread bar of adjustment entablature, make loading distribution beam get back to horizontal level, ensure that both sides concrete sample is subject to equal-sized axle center pulling force; When after the load being added to expection, pin gear type jack and tightened by distribution beam stop means, gear type jack holds lotus measure as first, and distribution beam stop means holds lotus safeguard measure as second;
Step 4, apply after axle draws load a period of time, whether the load applied by the inspection of pressure sensor readings instrument remains original size, to be loaded if changed by gear type jack;
Step 5, reach and hold the lotus time after, remove distribution beam stop means, shed the load of gear jack, rotate screw thread and remove and load entablature, then each concrete sample of dismounting one by one; Corresponding Mechanics Performance Testing can be carried out as required afterwards to concrete sample.
Further, described step 1 specifically comprises the steps:
The connection draw-in groove of step 11, making concrete sample, described connection draw-in groove comprises steel plate layer with bayonet and concrete layer, and the two is connected by structure glue; Wherein concrete layer surface is through frosting treatment;
Step 12, connect draw-in grooves by two and be placed in a test specimen mould, and to be fixed by a cruciform card slot type fixed mount; Described cruciform card slot type fixed mount comprises a long limit and a minor face, and described minor face both ends all arrange a draw-in groove, the draw-in groove that both ends, long limit are arranged before and after being provided with two; Two draw-in grooves of described minor face are connected with left and right two wall of test specimen mould, and two front bayonet slots on described long limit are connected with front and back two wall of test specimen mould, and after two of long limit, connection draw-in groove is fixed spacing in test specimen mould by draw-in groove;
Step 13, two circular sleeves to be connected with test specimen mould, i.e. brushing release agent on circular sleeve, then by circular sleeve through the preformed hole on test specimen mould, be enclosed within described connection draw-in groove;
Step 14, casting concrete and form removal, namely after test specimen mould filled by concrete, test specimen mould is put on bumper and shakes, immediately cruciform card slot type fixed mount is taken out afterwards, fill concrete hole and with reinforcing bar plug and pound ensure closely knit, at interval of a period of time slewing circle sleeve pipe, after concrete final set, circular sleeve is extracted out, form preformed hole; After concrete sample maintenance reaches striking time, remove the template of test specimen mould, form concrete sample.
Further, described distribution beam stop means can ensure that loading distribution beam does not rotate, it is identical that distribution beam stop means comprises two structures, and symmetrically arranged limit assembly, described limit assembly comprises: the vertical rod of two band grooves, two pulleys and a depression bar; Respectively pulley is installed in loading distribution beam both sides, and allow in the groove of the vertical vertical rod of pulley in distribution beam stop means and move, ensure that horizontal addload distribution beam does not rotate on the one hand, then reflect that loading distribution beam occurs tilting when pulley contacts with the groove walls of vertical rod vertical in distribution beam stop means on the other hand, now make loading distribution beam get back to horizontal level by the nut of the whorl brace rod adjusting entablature.
Further, lotus measure of holding in described distribution beam stop means is made up of gear type jack and two spacing fasteners and depression bar, depression bar is connected with two spacing fasteners, and be welded on loading distribution beam before loading, in loading procedure, distribution beam stop means moves together with loading distribution beam, after being added to predetermined load, tight a bolt, limit by gear type jack and the friction force between spacing fastener and vertical rod the motion loading distribution beam.
Tool of the present invention has the following advantages: the present invention is structural form and the fixing means thereof of tension built-in fitting, and multiple concrete sample strings by it, and the center of guaranteeing each concrete sample is together on straight line; Guarantee to apply not produce bias in the pulling force process of axle center.Guarantee holding in lotus process, load keeps stable, thus improves and apply to concrete sample the degree of accuracy that lasting axle draws the test of damage load, and decreases the workload of test.
Accompanying drawing explanation
Fig. 1 is existing cylinder center pre-buried deformed bar tension test unit.
Existing chuck carries out axial tension test unit to Fig. 2.
Fig. 3 is existing pre-buried rod-pulling type axis pulling experiment installation drawing.
Fig. 4 is existing test piece end built-in type dumb-bell shape test specimen.
Fig. 5 is existingly clamped in testing machine and carries out axle center tensile test.
Fig. 6 is the structural representation of test unit of the present invention.
Fig. 7 is the structural representation of distribution beam stop means of the present invention.
Fig. 8 is the structural representation of concrete sample of the present invention together with circular sleeve assembling.
Fig. 9 is the structural representation of connection draw-in groove of the present invention.
Figure 10 is the cross sectional representation of connection draw-in groove of the present invention.
Figure 11 is cruciform card slot type fixed rack structure schematic diagram of the present invention.
Figure 12 is the syndeton schematic diagram of entablature of the present invention and whorl brace rod.
Sectional view after Figure 13 to be whorl brace rod lower end of the present invention with concrete sample pre-buried be connected connection of draw-in groove.
Figure 14 is the structural representation of serial connection connecting link of the present invention.
Embodiment
Refer to shown in Fig. 6 to Figure 14, of the present inventionly a kind ofly apply to multiple concrete sample the test unit that lasting axle draws load, described test unit comprises: at least three reaction frame 1, entablatures 2, load distribution beam 3, spacing fastener 614, gear type jack 7, pressure transducer 8 of multiple serial connection connecting link 4, at least two whorl brace rod 5, distribution beam stop means 6, four and pressure sensor readings instrument 9; Described three reaction frame 1 side by side parallel are arranged, and described entablature 2 is erected at the top of three reaction frames 1; Described whorl brace rod 5 is fixed by nut through after entablature 2, and whorl brace rod 5 is positioned at the centre of adjacent two reaction frames; Described whorl brace rod 5 hangs multiple concrete samples 10, form a concrete sample string, described whorl brace rod 5 afterbody is connected with first concrete sample 10 in concrete sample string, connected by described serial connection connecting link 4 between adjacent two concrete samples 10, in concrete sample string, last concrete sample 10 is connected with the bayonet socket in described loading distribution beam 3 by serial connection connecting link 4; Described loading distribution beam 3 transverse strands is located at below the lower beam column 11 of three reaction frames 1, and be fixed by described distribution beam stop means 6, arrange described gear type jack 7 bottom the lower beam column 11 of middle reaction frame 1 and between loading distribution beam 3, spacing fastener 614 is welded in the top flange loading distribution beam two ends between two; Described pressure transducer 8 is arranged on gear type jack 7, and described pressure sensor readings instrument 9 is connected with described pressure transducer 8.
It is identical that described distribution beam stop means 6 comprises two structures, and symmetrically arranged limit assembly 61, described limit assembly 61 comprises: vertical rod 611, two pulleys 612 of two band grooves and a depression bar 613; Described spacing fastener 614 is set in vertical rod 611, and described depression bar 613 is erected between two spacing fasteners 614, and described loading distribution beam 3 is positioned at below depression bar 613, and between two vertical rods 611; Described pulley 612 is installed in the both sides of described loading distribution beam 3, and allows in the groove of the vertical vertical rod 611 of pulley 612 in distribution beam stop means 6 and move.
Described concrete sample 10 comprises a test specimen mould 101, two and connects draw-in groove 102 and a cruciform card slot type fixed mount 103; Described two connection draw-in grooves 102 are symmetricly set in test specimen mould 101; Described connection draw-in groove 102 comprises the steel plate layer with bayonet 1021, structural adhesive layer 1022 and the concrete layer 1023 that set gradually; Described cruciform card slot type fixed mount 103 comprises long limit 1031 and a minor face 1032, and described minor face 1032 both ends all arrange a draw-in groove 10321, the draw-in groove 10311 that both ends, long limit 1031 are arranged before and after being provided with two; Two draw-in grooves 10321 of described minor face 1032 are connected with left and right two wall of test specimen mould 101, two front bayonet slots on described long limit 1031 are connected with front and back two wall of test specimen mould 101, and after two of long limit 1031, connection draw-in groove 102 is fixed spacing in test specimen mould 101 by draw-in groove.Wherein, pre-buried fixing simple and convenient, the accurate positioning of draw-in groove 102 is connected.For accurate location and the convenient fixing of built-in fitting, devise a cruciform card slot type fixed mount 103, fixed by 4 notches and test specimen mould 101 wall, can ensure that cruciform card slot type fixed mount 103 is not moved and reverses; Meanwhile, the notch on cruciform card slot type fixed mount 103 is connected draw-in groove 102 again notch with built-in fitting is interconnected, thus guarantees that built-in fitting connects draw-in groove 102 and is not moved and reverses.Meanwhile, owing to being all connected by notch between each part, built-in fitting connects draw-in groove 102 and can locate fast and accurately.In addition, cruciform card slot type fixed mount 103 can be removed immediately after test specimen mould 101 builds full concrete, and turnover uses.
Wherein, described connection draw-in groove 102 comprises the steel plate layer with bayonet 1021, structural adhesive layer 1022 and the concrete layer 1023 that set gradually.The form adopting band bayonet socket steel plate layer 1021 to combine with concrete layer 1023, can reduce the loss of concrete sample 10 tensile bearing capacity to a certain extent; Simultaneously by the sectional area of control linkage draw-in groove 102, cross section is enable to bear the axle center damage load of plan applying.
In the present invention, described loading distribution beam 3 is " work " font.The afterbody of described whorl brace rod 5 is provided with " one " font positive stop strip 51.The rear and front end of described serial connection connecting link 4 is provided with " one " font positive stop strip 51, by positive stop strip 51 thus serial connection connecting link 4 can two concrete samples 10 of card main adjacent.
Of the present inventionly a kind of the test method that lasting axle draws load is applied to multiple concrete sample, described method need provide a test unit, and this test unit comprises: at least three reaction frames, entablatures, load distribution beam, multiple serial connection connecting link, at least two whorl brace rods, a distribution beam stop means, a gear type jack, a pressure transducer and pressure sensor readings instrument;
Described method specifically comprises the steps:
Step 1, make the concrete sample in multiple length of time morning; This step 1 specifically comprises the steps:
The connection draw-in groove of step 11, making concrete sample, described connection draw-in groove comprises steel plate layer with bayonet and concrete layer, and the two is connected by structure glue; Wherein concrete layer surface is through frosting treatment; Consider that the adhesive property between concrete and steel plate is poor, if directly by pre-buried for steel plate layer with bayonet in concrete, concrete weakens more obvious at the tensile bearing capacity of steel plate layer section.For this reason, the form adopting band bayonet socket steel plate layer to combine with concrete layer, can reduce the loss of concrete sample tensile bearing capacity to a certain extent; On the other hand by the sectional area of control linkage draw-in groove, reduce its sectional area meeting in load application situation as far as possible.The utilization of structure glue in engineering of existing market is comparatively ripe, can ensure to be with reliably gluing between bayonet socket steel plate layer and concrete layer.In manufacturing process, precast concrete adopts the higher leveled concreting of strength grade of concrete of test part of having a competition shaping.
Step 12, connect draw-in grooves by two and be placed in a test specimen mould, and to be fixed by a cruciform card slot type fixed mount; Described cruciform card slot type fixed mount comprises a long limit and a minor face, and described minor face both ends all arrange a draw-in groove, the draw-in groove that both ends, long limit are arranged before and after being provided with two; Two draw-in grooves of described minor face are connected with left and right two wall of test specimen mould, and two front bayonet slots on described long limit are connected with front and back two wall of test specimen mould, and after two of long limit, connection draw-in groove is fixed spacing in test specimen mould by draw-in groove; Described minor face both ends all arrange a draw-in groove thus limit the displacement of cruciform card slot type fixed mount along X, Z-direction, and around the rotation of X, Y, Z axis; On the long limit of this external cruciform card slot type fixed mount, (position of corresponding pre-buried connection draw-in groove) arranges 2 notches of front and back respectively.2 notches (position of corresponding pre-buried connection draw-in groove) of this cruciform card slot type fixed mount connect with the notch on pre-buried connection draw-in groove, thus limit the displacement of connection draw-in groove along X, Z-direction, and around the rotation of X, Y, Z axis, reach the object of fixing pre-buried draw-in groove.
Step 13, two circular sleeves to be connected with test specimen mould, i.e. brushing release agent on circular sleeve, then by circular sleeve through the preformed hole on test specimen mould, be enclosed within described connection draw-in groove;
Step 14, casting concrete and form removal, namely after test specimen mould filled by concrete, test specimen mould is put on bumper and shakes, immediately cruciform card slot type fixed mount is taken out afterwards, fill concrete hole and with reinforcing bar plug and pound ensure closely knit, at interval of a period of time slewing circle sleeve pipe, after concrete final set, circular sleeve is extracted out, form preformed hole; After concrete sample maintenance reaches striking time, remove the template of test specimen mould, form concrete sample.
Step 2, described experimental provision is installed, and pulling force is applied to each concrete sample; This step 2 is specially: be connected by the entablature of whorl brace rod with reaction frame top, connected mode is by the upper and lower preformed hole at entablature, whorl brace rod is fixed by nut through rear one end, and utilize nut to make loading distribution beam maintenance level to regulate the height of the right and left concrete sample string, connection draw-in groove in the whorl brace rod other end and concrete sample connects, and hangs concrete sample; Connected by serial connection connecting link and described connection draw-in groove between each concrete sample, form a concrete sample string, and by adjusting the position of the connection draw-in groove in concrete sample, ensure that each concrete sample is on same perpendicular line, the bottom of concrete sample string adopts serial connection connecting link to be connected with the bayonet socket loaded in distribution beam.Described distribution beam stop means can ensure that loading distribution beam does not rotate, it is identical that distribution beam stop means comprises two structures, and symmetrically arranged limit assembly, described limit assembly comprises: the vertical rod of two band grooves, two pulleys, a depression bar and two spacing fasteners; Respectively pulley is installed in loading distribution beam both sides, and allow in the groove of the vertical vertical rod of pulley in distribution beam stop means and move, ensure that horizontal addload distribution beam does not rotate on the one hand, then reflect that loading distribution beam occurs tilting when pulley contacts with the groove walls of vertical rod vertical in distribution beam stop means on the other hand, now make loading distribution beam get back to horizontal level by the nut of the whorl brace rod adjusting entablature.
The lower beam column of three reaction frames arranges distribution beam stop means to be undertaken spacing by loading distribution beam, and spacing fastener is welded in the top flange loading distribution beam two ends between two; Apply downward pressure to loading distribution beam by gear type jack, apply pulling force namely indirectly to the concrete string on both sides, the equal pulling force that both sides string concrete sample is subject to, pulling force size is the half of jack pressure;
Step 3, lasting axle is applied to multiple early-age concrete test specimen draw load; Determine the ultimate tensile strength (UTS) of early-age concrete; This step 3 is specially: apply to concrete sample the tension load that size is Ultimate Tensile bearing capacity 8% ~ 12%, check whether each part of experimental provision can normally work, and then unloads; According to the load that the axle drafting applying draws, adopt the very heavy load application of gear type and utilize pressure transducer and pressure sensor readings instrument directly to read apply load; When in loading procedure due to test piece deformation is inconsistent or Influence from Eccentric time, namely load distribution beam to occur tilting, when the pulley loaded in distribution beam contacts with the groove walls of distribution beam stop means, then by the nut of the connecting thread bar of adjustment entablature, make loading distribution beam get back to horizontal level, ensure that both sides concrete sample is subject to equal-sized axle center pulling force; Thus overcome the impact that test piece deformation discreteness brings.When after the load being added to expection, pin gear type jack and tightened by distribution beam stop means, gear type jack holds lotus measure as first, and distribution beam stop means holds lotus safeguard measure as second; Lotus measure of holding in described distribution beam stop means is made up of gear type jack, two spacing fasteners and depression bar, depression bar is connected with two spacing fasteners, and be welded on loading distribution beam before loading, in loading procedure, distribution beam stop means moves together with loading distribution beam, after being added to predetermined load, tight a bolt, limit by gear jack and the friction force between spacing fastener and vertical rod the motion loading distribution beam.The tensile strength of general concrete is about 1 ~ 2MPa, then its ultimate bearing capacity is about 22.5kN ~ 45kN.Although the pulling force that each concrete sample is subject to is due to the impact of deadweight, slightly difference but can ignore, as taken tensile strength as 1.5MPa, the ultimate load applying 30% is example, a string be 4 test blocks is example, then each string concrete sample is applied to the axial load of 10 ~ 11kN (as: 10.125kN), the Gravitative Loads that one, the top test specimen is subject to 3 test specimens than a bottom test specimen more amounts to 0.486kN, difference 4.8%.
Step 4, apply after axle draws load a period of time, whether the load applied by the inspection of pressure sensor readings instrument remains original size, to be loaded if changed by gear type jack;
Step 5, reach and hold the lotus time after, remove distribution beam stop means, shed the load of gear jack, rotate screw thread and remove and load entablature, then each concrete sample of dismounting one by one; Corresponding Mechanics Performance Testing can be carried out as required afterwards to concrete sample.This Mechanics Performance Testing comprises strain-stress relation, elastic modulus etc.
The present invention can simultaneously to multiple concrete sample applying in age morning axle center pulling force.In order to be strung by multiple early-age concrete test specimen and ensure vertical, devise the form that draw-in groove connects.This connection makes rod member be connected with the bayonet socket of draw-in groove by being rotationally connected bar, and bayonet socket also for adjustment, thus can guarantee that each test specimen is on a perpendicular line in reserved certain space.By arranging reaction frame, whorl brace rod, beading rod, gear type jack, pressure transducer, pressure sensor readings instrument, loading distribution beam and distribution beam stop means etc., apply axial load to multiple concrete sample.Its key point is: ensure that loading distribution beam does not rotate and tilt by distribution beam stop means, include the vertical rod of band groove, pulley, depression bar and spacing fastener, respectively pulley is installed in distribution beam both sides, and allow in the groove of the vertical vertical rod of pulley in distribution beam stop means and move, ensure that horizontal distribution beam does not rotate on the one hand, then reflect that loading distribution beam occurs tilting when pulley contacts with the groove walls of vertical rod vertical in distribution beam stop means on the other hand, now distribution beam is made to get back to horizontal level by threaded rod nut on adjustment crossbeam, namely the permissible error stop means that the groove on stop means tilts as crossbeam.
In addition, the present invention keeps multiple early-age concrete test specimen axial tension load for a long time.By arranging reaction frame, entablature, gear type jack, pressure transducer, loading distribution beam and distribution beam stop means, its axle center pulling force is kept for a long time to two string concrete samples.It is characterized in that: hold lotus measure by pinning gear type jack as first, distribution beam position limit device holds lotus safeguard measure as second.Wherein, lotus measure of holding in distribution beam stop means is made up of two spacing fasteners and depression bar, depression bar is connected with two spacing fasteners, and be welded on distribution beam before loading, in loading procedure, distribution beam stop means moves together with distribution beam, after being added to predetermined load, tighten spiral shell bolt, limited the motion loading distribution beam by the friction force between fastener and vertical rod.Thus improve the degree of accuracy of test that lasting axle draws damage load is applied to concrete sample.
The foregoing is only preferred embodiment of the present invention, all equalizations done according to the present patent application the scope of the claims change and modify, and all should belong to covering scope of the present invention.
Claims (10)
1. the test unit that lasting axle draws load is applied to multiple concrete sample, it is characterized in that: described test unit comprises: at least three reaction frames, entablatures, load distribution beam, multiple serial connection connecting link, at least two whorl brace rods, four spacing fasteners, a gear type jack, a pressure transducer and pressure sensor readings instrument; Described three reaction frame side by side parallel are arranged, and described entablature is erected at the top of three reaction frames; Described whorl brace rod is fixed by nut through after entablature, and whorl brace rod is positioned at the centre of adjacent two reaction frames; Described whorl brace rod hangs multiple concrete samples, form a concrete sample string, described whorl brace rod afterbody is connected with first concrete sample in concrete sample string, connected by described serial connection connecting link between adjacent two concrete samples, in concrete sample string, last concrete sample is connected with the bayonet socket in described loading distribution beam by serial connection connecting link; Described loading distribution beam transverse strands is located at below the lower beam column of three reaction frames, arranges described gear type jack bottom the lower beam column of middle reaction frame and between loading distribution beam; Spacing fastener is welded in the top flange loading distribution beam two ends between two; Described pressure transducer is arranged on gear type jack, and described pressure sensor readings instrument is connected with described pressure transducer.
2. according to claim 1 the test unit that lasting axle draws load is applied to multiple concrete sample, it is characterized in that: it is identical that described distribution beam stop means comprises two structures, and symmetrically arranged limit assembly, described limit assembly comprises: the vertical rod of two band grooves, two pulleys and a depression bar; Described spacing fastener is set in vertical rod, and described depression bar is erected between two spacing fasteners, and described loading distribution beam is positioned at below depression bar, and between two vertical rods; Described pulley is installed in the both sides of described loading distribution beam, and allows in the groove of the vertical vertical rod of pulley in distribution beam stop means and move.
3. according to claim 1 the test unit that lasting axle draws load is applied to multiple concrete sample, it is characterized in that: described concrete sample comprise a test specimen mould, two connect draw-in grooves and a cruciform card slot type fixed mount; Described two connection draw-in grooves are symmetricly set in test specimen mould; Described connection draw-in groove comprises the steel plate layer with bayonet, structural adhesive layer and the concrete layer that set gradually; Described cruciform card slot type fixed mount comprises a long limit and a minor face, and described minor face both ends all arrange a draw-in groove, the draw-in groove that both ends, long limit are arranged before and after being provided with two; Two draw-in grooves of described minor face are connected with left and right two wall of test specimen mould, and two front bayonet slots on described long limit are connected with front and back two wall of test specimen mould, and after two of long limit, connection draw-in groove is fixed spacing in test specimen mould by draw-in groove.
4. according to claim 1 the test unit that lasting axle draws load is applied to multiple concrete sample, it is characterized in that: described loading distribution beam is " work " font.
5. according to claim 1 the test unit that lasting axle draws load is applied to multiple concrete sample, it is characterized in that: the afterbody of described whorl brace rod is provided with " one " font positive stop strip.
6. according to claim 1 the test unit that lasting axle draws load is applied to multiple concrete sample, it is characterized in that: the rear and front end of described serial connection connecting link is provided with " one " font positive stop strip.
7. one kind applies to multiple concrete sample the test method that lasting axle draws load, it is characterized in that: described method need provide a test unit, this test unit comprises: at least three reaction frames, an entablature, one load distribution beam, multiple serial connection connecting link, at least two whorl brace rods, a distribution beam stop means, four spacing fasteners, a gear type jack, a pressure transducer and pressure sensor readings instrument;
Described method specifically comprises the steps:
Step 1, make the concrete sample in multiple length of time morning;
Step 2, described experimental provision is installed, and pulling force is applied to each concrete sample; This step 2 is specially: be connected by the entablature of whorl brace rod with reaction frame top, connected mode is by the upper and lower preformed hole at entablature, whorl brace rod is fixed by nut through rear one end, and utilize nut to make loading distribution beam maintenance level to regulate the height of the right and left concrete sample string, connection draw-in groove in the whorl brace rod other end and concrete sample connects, and hangs concrete sample; Connected by serial connection connecting link and described connection draw-in groove between each concrete sample, form a concrete sample string, and by adjusting the position of the connection draw-in groove in concrete sample, ensure that each concrete sample is on same perpendicular line, the bottom of concrete sample string adopts serial connection connecting link to be connected with the bayonet socket loaded in distribution beam, the lower beam column of three reaction frames arranges distribution beam stop means to be undertaken spacing by loading distribution beam, and spacing fastener is welded in the top flange loading distribution beam two ends between two; Apply downward pressure to loading distribution beam by gear type jack, apply pulling force namely indirectly to the concrete string on both sides, the equal pulling force that both sides string concrete sample is subject to, pulling force size is the half of jack pressure;
Step 3, lasting axle is applied to multiple early-age concrete test specimen draw load; This step 3 is specially: apply to concrete sample the tension load that size is Ultimate Tensile bearing capacity about 8%-12%, check whether each part of experimental provision can normally work, and then unloads; Axle according to drafting applying draws load, adopt the very heavy load application of gear type and utilize pressure transducer and pressure sensor readings instrument directly to read apply load; When in loading procedure due to test piece deformation is inconsistent or Influence from Eccentric time, namely load distribution beam to occur tilting, when the pulley loaded in distribution beam contacts with the groove walls of distribution beam stop means, then by the nut of the connecting thread bar of adjustment entablature, make loading distribution beam get back to horizontal level, ensure that both sides concrete sample is subject to equal-sized axle center pulling force; When after the load being added to expection, pin gear type jack and tightened by distribution beam stop means, gear type jack holds lotus measure as first, and distribution beam stop means holds lotus safeguard measure as second;
Step 4, apply after axle draws load a period of time, whether the load applied by the inspection of pressure sensor readings instrument remains original size, to be loaded if changed by gear type jack;
Step 5, reach and hold the lotus time after, remove distribution beam stop means, shed the load of gear jack, rotate screw thread and remove and load entablature, then each concrete sample of dismounting one by one; Corresponding Mechanics Performance Testing can be carried out as required afterwards to concrete sample.
8. according to claim 7ly a kind of the test method that lasting axle draws load is applied to multiple concrete sample, it is characterized in that: described step 1 specifically comprises the steps:
The connection draw-in groove of step 11, making concrete sample, described connection draw-in groove comprises steel plate layer with bayonet and concrete layer, and the two is connected by structure glue; Wherein concrete layer surface is through frosting treatment;
Step 12, connect draw-in grooves by two and be placed in a test specimen mould, and to be fixed by a cruciform card slot type fixed mount; Described cruciform card slot type fixed mount comprises a long limit and a minor face, and described minor face both ends all arrange a draw-in groove, the draw-in groove that both ends, long limit are arranged before and after being provided with two; Two draw-in grooves of described minor face are connected with left and right two wall of test specimen mould, and two front bayonet slots on described long limit are connected with front and back two wall of test specimen mould, and after two of long limit, connection draw-in groove is fixed spacing in test specimen mould by draw-in groove;
Step 13, two circular sleeves to be connected with test specimen mould, i.e. brushing release agent on circular sleeve, then by circular sleeve through the preformed hole on test specimen mould, be enclosed within described connection draw-in groove;
Step 14, casting concrete and form removal, namely after test specimen mould filled by concrete, test specimen mould is put on bumper and shakes, immediately cruciform card slot type fixed mount is taken out afterwards, fill concrete hole and with reinforcing bar plug and pound ensure closely knit, at interval of a period of time slewing circle sleeve pipe, after concrete final set, circular sleeve is extracted out, form preformed hole; After concrete sample maintenance reaches striking time, remove the template of test specimen mould, form concrete sample.
9. according to claim 7ly a kind of the test method that lasting axle draws load is applied to multiple concrete sample, it is characterized in that: described distribution beam stop means can ensure that loading distribution beam does not rotate, it is identical that distribution beam stop means comprises two structures, and symmetrically arranged limit assembly, described limit assembly comprises: the vertical rod of two band grooves, two pulleys and a depression bar; Respectively pulley is installed in loading distribution beam both sides, and allow in the groove of the vertical vertical rod of pulley in distribution beam stop means and move, ensure that horizontal addload distribution beam does not rotate on the one hand, then reflect that loading distribution beam occurs tilting when pulley contacts with the groove walls of vertical rod vertical in distribution beam stop means on the other hand, now make loading distribution beam get back to horizontal level by the nut of the whorl brace rod adjusting entablature.
10. according to claim 9ly a kind of the test method that lasting axle draws load is applied to multiple concrete sample, it is characterized in that: the lotus measure of holding in described distribution beam stop means is by gear type jack, two spacing fasteners and depression bar composition, depression bar is connected with two spacing fasteners, and be welded on loading distribution beam before loading, in loading procedure, distribution beam stop means moves together with loading distribution beam, after being added to predetermined load, tight a bolt, the motion loading distribution beam is limited by gear type jack and the friction force between spacing fastener and vertical rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510827859.4A CN105277442B (en) | 2015-11-25 | 2015-11-25 | Multiple concrete samples are applied with experimental rig and method that lasting axle draws load |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510827859.4A CN105277442B (en) | 2015-11-25 | 2015-11-25 | Multiple concrete samples are applied with experimental rig and method that lasting axle draws load |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105277442A true CN105277442A (en) | 2016-01-27 |
| CN105277442B CN105277442B (en) | 2018-01-09 |
Family
ID=55146836
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510827859.4A Active CN105277442B (en) | 2015-11-25 | 2015-11-25 | Multiple concrete samples are applied with experimental rig and method that lasting axle draws load |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105277442B (en) |
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106813994A (en) * | 2017-03-22 | 2017-06-09 | 重庆大学 | The large-scale many specimen test devices of MTS CYCLIC LOADINGs single and discreteness discrimination method |
| CN106840731A (en) * | 2017-03-23 | 2017-06-13 | 福州大学 | Test specimen free degree restraint device and its construction method |
| CN106996896A (en) * | 2017-05-23 | 2017-08-01 | 东莞理工学院 | A kind of FRP Concrete Beam Reinforceds hold lotus loading remotely intelligently monitoring device for a long time |
| CN108287113A (en) * | 2018-02-09 | 2018-07-17 | 西南交通大学 | A kind of testing equipment for ring component in slope protection structure |
| CN108469378A (en) * | 2018-06-06 | 2018-08-31 | 重庆大学 | A kind of oblique pull-out test device of lever built-in fitting and its test method |
| CN109540650A (en) * | 2018-12-05 | 2019-03-29 | 河海大学 | A kind of modular multi-function self-balancing reaction frame loading device and its application method |
| CN110702509A (en) * | 2019-09-23 | 2020-01-17 | 重庆大学 | Cement-based material continuous loading device for durability test |
| CN111006998A (en) * | 2019-12-24 | 2020-04-14 | 青岛理工大学 | Concrete loading device for simulating stress state of any point of tunnel |
| CN111504797A (en) * | 2020-05-27 | 2020-08-07 | 黑龙江八一农垦大学 | Small diameter timber tension and compression strength measuring device |
| CN111707541A (en) * | 2020-06-24 | 2020-09-25 | 扬州大学 | Concrete uniaxial tension holding load and testing device and using method thereof |
| CN111982775A (en) * | 2020-08-17 | 2020-11-24 | 河海大学 | Device and method for testing water permeability of concrete under tensile stress |
| CN112284905A (en) * | 2020-12-29 | 2021-01-29 | 中铁科学研究院有限公司 | Concrete detection device and method |
| CN112345355A (en) * | 2020-11-02 | 2021-02-09 | 西南石油大学 | Cement stone tensile strength testing device and method |
| CN112504958A (en) * | 2020-10-15 | 2021-03-16 | 北京工业大学 | Testing device for reinforced concrete bonding slippage |
| CN112683668A (en) * | 2020-12-08 | 2021-04-20 | 信通院(保定)科技创新研究院有限公司 | Static load test device for communication support |
| CN112834320A (en) * | 2020-11-03 | 2021-05-25 | 贵州大学 | Dry-wet cycle triaxial testing machine and use method thereof |
| CN114486500A (en) * | 2022-02-25 | 2022-05-13 | 哈尔滨工业大学 | Concrete creep test device suitable for various stress combinations and test method thereof |
| CN116008060A (en) * | 2023-01-10 | 2023-04-25 | 北京建筑大学 | Prefabricated composite wall insulation layer and mechanical property test device for connecting piece thereof |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000180322A (en) * | 1998-12-18 | 2000-06-30 | Chokoon Zairyo Kenkyusho:Kk | Test piece for biaxial load test of tension and compression, testing device, and testing method |
| CN101271103A (en) * | 2008-05-16 | 2008-09-24 | 东南大学 | Experimental device for concrete multifactor permanent stability under co-action of pulling stress and surroundings |
| CN101387634A (en) * | 2008-10-17 | 2009-03-18 | 东南大学 | Uniaxial tension loading unit for testing concrete carbonizing performance under tensile stress and testing method |
| CN101776555A (en) * | 2010-01-25 | 2010-07-14 | 广州大学 | Loading device for concrete durability test |
| CN102778399A (en) * | 2012-06-29 | 2012-11-14 | 哈尔滨工程大学 | Loading device and method for exposure test of compression concrete |
| CN103175746A (en) * | 2011-12-26 | 2013-06-26 | 珠海市三思泰捷电气设备有限公司 | Multi-head electronic type high-temperature creep permanent strength testing machine |
| CN203785953U (en) * | 2014-03-26 | 2014-08-20 | 中交四航工程研究院有限公司 | Loading system of durability test of concrete sample |
| JP2015004525A (en) * | 2013-06-19 | 2015-01-08 | 株式会社Ihi | Test device |
| CN205175824U (en) * | 2015-11-25 | 2016-04-20 | 福建工程学院 | Apply test device that lasting axle drew damage load to a plurality of concrete samples |
-
2015
- 2015-11-25 CN CN201510827859.4A patent/CN105277442B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000180322A (en) * | 1998-12-18 | 2000-06-30 | Chokoon Zairyo Kenkyusho:Kk | Test piece for biaxial load test of tension and compression, testing device, and testing method |
| CN101271103A (en) * | 2008-05-16 | 2008-09-24 | 东南大学 | Experimental device for concrete multifactor permanent stability under co-action of pulling stress and surroundings |
| CN101387634A (en) * | 2008-10-17 | 2009-03-18 | 东南大学 | Uniaxial tension loading unit for testing concrete carbonizing performance under tensile stress and testing method |
| CN101776555A (en) * | 2010-01-25 | 2010-07-14 | 广州大学 | Loading device for concrete durability test |
| CN103175746A (en) * | 2011-12-26 | 2013-06-26 | 珠海市三思泰捷电气设备有限公司 | Multi-head electronic type high-temperature creep permanent strength testing machine |
| CN102778399A (en) * | 2012-06-29 | 2012-11-14 | 哈尔滨工程大学 | Loading device and method for exposure test of compression concrete |
| JP2015004525A (en) * | 2013-06-19 | 2015-01-08 | 株式会社Ihi | Test device |
| CN203785953U (en) * | 2014-03-26 | 2014-08-20 | 中交四航工程研究院有限公司 | Loading system of durability test of concrete sample |
| CN205175824U (en) * | 2015-11-25 | 2016-04-20 | 福建工程学院 | Apply test device that lasting axle drew damage load to a plurality of concrete samples |
Cited By (29)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106813994B (en) * | 2017-03-22 | 2019-11-15 | 重庆大学 | The discreteness discrimination method of the large-scale more specimen test devices of MTS CYCLIC LOADING single |
| CN106813994A (en) * | 2017-03-22 | 2017-06-09 | 重庆大学 | The large-scale many specimen test devices of MTS CYCLIC LOADINGs single and discreteness discrimination method |
| CN106840731A (en) * | 2017-03-23 | 2017-06-13 | 福州大学 | Test specimen free degree restraint device and its construction method |
| CN106996896A (en) * | 2017-05-23 | 2017-08-01 | 东莞理工学院 | A kind of FRP Concrete Beam Reinforceds hold lotus loading remotely intelligently monitoring device for a long time |
| CN106996896B (en) * | 2017-05-23 | 2023-03-14 | 东莞理工学院 | Long-term load-holding remote intelligent monitoring device for FRP (fiber reinforced Plastic) reinforced concrete beam |
| CN108287113A (en) * | 2018-02-09 | 2018-07-17 | 西南交通大学 | A kind of testing equipment for ring component in slope protection structure |
| CN108287113B (en) * | 2018-02-09 | 2024-06-04 | 西南交通大学 | Test equipment for ring member in slope protection structure |
| CN108469378B (en) * | 2018-06-06 | 2024-01-09 | 重庆大学 | Lever type embedded part oblique drawing test device and test method thereof |
| CN108469378A (en) * | 2018-06-06 | 2018-08-31 | 重庆大学 | A kind of oblique pull-out test device of lever built-in fitting and its test method |
| CN109540650A (en) * | 2018-12-05 | 2019-03-29 | 河海大学 | A kind of modular multi-function self-balancing reaction frame loading device and its application method |
| CN109540650B (en) * | 2018-12-05 | 2021-05-11 | 河海大学 | Modular multifunctional self-balancing reaction frame loading device and application method thereof |
| CN110702509A (en) * | 2019-09-23 | 2020-01-17 | 重庆大学 | Cement-based material continuous loading device for durability test |
| CN110702509B (en) * | 2019-09-23 | 2024-03-12 | 重庆大学 | Cement-based material continuous loading device for durability test |
| CN111006998A (en) * | 2019-12-24 | 2020-04-14 | 青岛理工大学 | Concrete loading device for simulating stress state of any point of tunnel |
| CN111006998B (en) * | 2019-12-24 | 2021-06-29 | 青岛理工大学 | Concrete loading device for simulating stress state of any point of tunnel |
| CN111504797B (en) * | 2020-05-27 | 2023-03-14 | 黑龙江八一农垦大学 | Small diameter timber tension and compression strength measuring device |
| CN111504797A (en) * | 2020-05-27 | 2020-08-07 | 黑龙江八一农垦大学 | Small diameter timber tension and compression strength measuring device |
| CN111707541A (en) * | 2020-06-24 | 2020-09-25 | 扬州大学 | Concrete uniaxial tension holding load and testing device and using method thereof |
| CN111982775A (en) * | 2020-08-17 | 2020-11-24 | 河海大学 | Device and method for testing water permeability of concrete under tensile stress |
| CN111982775B (en) * | 2020-08-17 | 2022-08-12 | 河海大学 | Device and method for testing water permeability of concrete under tensile stress |
| CN112504958A (en) * | 2020-10-15 | 2021-03-16 | 北京工业大学 | Testing device for reinforced concrete bonding slippage |
| CN112345355A (en) * | 2020-11-02 | 2021-02-09 | 西南石油大学 | Cement stone tensile strength testing device and method |
| CN112834320A (en) * | 2020-11-03 | 2021-05-25 | 贵州大学 | Dry-wet cycle triaxial testing machine and use method thereof |
| CN112683668A (en) * | 2020-12-08 | 2021-04-20 | 信通院(保定)科技创新研究院有限公司 | Static load test device for communication support |
| CN112284905A (en) * | 2020-12-29 | 2021-01-29 | 中铁科学研究院有限公司 | Concrete detection device and method |
| CN114486500B (en) * | 2022-02-25 | 2023-11-10 | 哈尔滨工业大学 | Concrete creep test device suitable for various stress combinations and test method thereof |
| CN114486500A (en) * | 2022-02-25 | 2022-05-13 | 哈尔滨工业大学 | Concrete creep test device suitable for various stress combinations and test method thereof |
| CN116008060B (en) * | 2023-01-10 | 2024-01-23 | 北京建筑大学 | Prefabricated composite wall insulation layer and mechanical property test device for connecting piece thereof |
| CN116008060A (en) * | 2023-01-10 | 2023-04-25 | 北京建筑大学 | Prefabricated composite wall insulation layer and mechanical property test device for connecting piece thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105277442B (en) | 2018-01-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105277442A (en) | Testing device and method for applying lasting axial tension loads to plurality of concrete test pieces | |
| CN205175824U (en) | Apply test device that lasting axle drew damage load to a plurality of concrete samples | |
| CN102519871B (en) | Method and device for measuring bonding strength between reinforcing steel and concrete under action of pre-stress | |
| CN103234902B (en) | Device and method for testing adhesive property between fiber reinforce plastic (FRP) rib and concrete under complicated stress state | |
| CN107167378A (en) | Axial tension experimental rig and its test method | |
| CN101806714B (en) | Beam tester of bonding strength of fibre reinforced composite sheet and concrete | |
| CN201788123U (en) | Bond anchorage pull-out test device | |
| CN206696093U (en) | Axial tension experimental rig | |
| CN109060555B (en) | Concrete creep testing device and analysis method based on four-point bending loading | |
| CN103267724B (en) | The beam tester of fiber-reinforced composite muscle material and concrete bonding intensity | |
| CN101824801B (en) | Non-in-situ prepressing method of self-anchored type support frame and self-anchored type support frame thereof | |
| CN111751276A (en) | Loading device and method for bonding performance test of reinforcement and confined concrete | |
| CN106289977B (en) | Bolt concrete tensile test device and test method | |
| CN102914470B (en) | Device and method for testing concrete sample beam stiffness | |
| CN208748712U (en) | A kind of test pile vertical compression detection device | |
| CN103321259B (en) | Testing system for anchor network reinforcement of underground engineering broken surrounding rock | |
| CN107884279A (en) | The horizontal full Digitized Servo Control direct tensile test system of rock | |
| CN205844093U (en) | Multiple concrete samples are applied simultaneously the assay device of lasting shaft pressuring load | |
| CN203231963U (en) | Beam test device for bonding strength of fiber-reinforced composite reinforcement rib material and concrete | |
| Li et al. | Experimental behavior of high strength concrete-filled square steel tube under bi-axial eccentric loading | |
| CN206710210U (en) | Axial tension experimental rig under effect of contraction | |
| Badalamenti et al. | Seismic behavior of hybrid steel trussed concrete beams | |
| CN205175775U (en) | Novel concrete is drawn built -in fitting device | |
| CN105954105B (en) | Multiple concrete samples are applied with the experimental rig of lasting shaft pressuring load simultaneously | |
| CN201637656U (en) | Girder type tester of bonding strength between fiber-reinforced compound sheet and concrete |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |