CN104949888A - Multiscale loading device for recycled concrete long-term crack test - Google Patents
Multiscale loading device for recycled concrete long-term crack test Download PDFInfo
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Abstract
The invention discloses a multiscale loading device for a recycled concrete long-term crack test. The loading device comprises a specially-shaped bearing platform, wherein two positioning columns are arranged on the specially-shaped bearing platform and can slide relative to the specially-shaped bearing platform in the horizontal direction; a member is supported by the two positioning columns and positioned on the positioning column; a loading device is arranged above the member. According to the device, through the adjustment of the whole position of the positioning columns and the member, the loading of the member at different positions can be realized by the loading device according to different loading requirements, and one-third point loading or partial loading can be realized, so that the application range of the loading and measuring device is widened; through the lever principle, the total weight of a balancing weight can be enlarged to a certain multiple to be applied to a member to be measured, then the whole device can form a self-balancing system to ensure that the loading of the member can be constant under the long-term loading effect, and the operation method is convenient and feasible, so that the measuring result is closer to the actual situation, and the obtained conclusion is more convincing.
Description
Technical field
The present invention relates to a kind of charger, be specifically related to the many Proportional valve load equipments of the long-term crack test of a kind of regeneration concrete.
Technical background
Regeneration concrete is as the important component part of concrete material, because it is from heavy and light, fire performance is strong, wide material sources, the advantageous feature such as environmental protection and energy saving, more and more be subject to building materials enterprise, the concern of scientific research institutions, the cement cementitious body minute aperture existed due to regenerated coarse aggregate surface in regeneration concrete and micro-crack, the crack Changing Pattern of Recycled Concrete Beams under long term constant load action and normal concrete beams be there are differences, and the Changing Pattern in crack has very important impact to Recycled Concrete Beams long-term behaviour and permanance, current Chinese scholars has carried out comparatively comprehensive and systematic Research And Engineering explorative research to regeneration concrete, but it is still not enough for the research in recycled concrete component regular pattern of fractures under the effect of long term constant load etc., therefore the research in the crack of Recycled Concrete Beams under long term constant load action just seems particularly important.
The loading method in current Recycled Concrete Beams crack under long term constant load action has several frequently seen survey method such as lifting jack pressurization, big spring force method and the direct method of piling of weight etc.For lifting jack pressurization, limitation due to lifting jack self structure causes the phenomenon easily occurring " oil return " in long-term pressure process, and after component deforms, the support distances of lifting jack is elongated, jack pressure value is changed, thus can not meet component load under action of long-term load this key request constant.For big spring force method, after component generation deformation, the length of big spring is changed, thus can not ensure that the load applied to component keeps constant equally.For the direct method of piling of weight, pile up and load to reach huge force value, very high to the density requirements piling up balancing weight, very strict to the requirement of test site, implementation process is very difficult, load mode is dumb, component is piled up a large amount of weight and brings the problems such as very large potential safety hazard to process of the test.
Summary of the invention
For above-mentioned problems of the prior art or defect, the object of the invention is to, provide the long-term crack test of a kind of regeneration concrete many Proportional valve load equipments.
For achieving the above object, the present invention adopts following technical scheme:
The many Proportional valve load equipments of a kind of long-term crack test of regeneration concrete, comprise special-shaped cushion cap, two reference columns that can slide in the horizontal direction relative to special-shaped cushion cap are provided with above described special-shaped cushion cap, top common support component of two described reference columns, the top of described component arranges charger.
Further, described special-shaped cushion cap is provided with chute along its Width, and described reference column can along slide.
Particularly, described charger comprises and being horizontally disposed with and the girder steel vertical with described component, and described girder steel is marked with scale; Described girder steel one end is connected with special-shaped cushion cap by the steel arm vertically arranged, and girder steel is connected with steel arm is movable;
The weighted platform that can slide along girder steel length direction is installed below the other end of described girder steel.
Particularly, described girder steel is provided with pulley, described pulley can slide along girder steel length direction, connects described weighted platform below described pulley.
Further, a distribution beam is provided with between described girder steel and component; Be provided with circular shaft bearing and triangular support base between described distribution beam and component, described circular shaft bearing and triangular support base are symmetrical arranged about distribution beam centre position.
Further, triangular support base is provided with between described reference column and component.
Alternatively, described girder steel is connected by pin with steel arm.
Alternatively, described special-shaped cushion cap is symmetrical polygon.
Compared with prior art, the present invention has following technique effect:
1, arrange reference column for supporting the component of top, its position can adjust according to the size of different component, makes two reference columns lay respectively at the below at component two ends with supporting member; Regulate the position of reference column and member integrated, make charger can require according to different loadings to load the diverse location of component, realize three branches and load or partially load, thus improve the usable range of loading and measurement mechanism.
2, charger is set, utilizing lever principle the general assembly (TW) of balancing weight can be amplified certain multiple is applied on component to be measured, whole device forms a self-balancing system, ensure that component load under action of long-term load is invariable, method of operating facilitates feasible, make measurement result more close to actual conditions, the conclusion drawn has more cogency.
3, pulley driving weighted platform is utilized to slide along girder steel length direction, thus when the weight of balancing weight is constant, change the enlargement factor of balancing weight general assembly (TW), thus change the size of the pressure be applied on component, thus make the stressed more flexible of component; And girder steel is marked with scale, for accurately reading weighted platform position, be convenient to calculate component pressure.
4, arranging special-shaped cushion cap is the polygon deformed bar concrete bearing platform connected, and ensures that reference column has sufficiently long displacement on special-shaped cushion cap, makes reference column can support the component of different size; And special-shaped cushion cap extends along girder steel length direction part, thus enable special-shaped cushion cap bear the moment of flexure brought in loading procedure, ensure the stability of whole experimental provision.
Accompanying drawing explanation
Fig. 1 is front elevation of the present invention;
Fig. 2 is vertical view of the present invention;
Fig. 3 is side view of the present invention;
Fig. 4 is weighted platform structural representation;
Number in the figure represents: 1-steel rib, 2-pulley, 3-weighted platform, 4-girder steel, 5-special-shaped cushion cap, 6-reference column, 7-steel arm, 8-plain bar, 9-component, 10-distribution beam, 11-chute, 12-circular shaft bearing, 13-triangular support base, 14-triangular support base, 15-steel plate, 16-bolt, 17-vertically reinforcing bar, 18-U-shaped reinforcing bar.
Below in conjunction with the drawings and the specific embodiments the solution of the present invention done and explain in further detail and illustrate.
Embodiment
Defer to technique scheme, see Fig. 1-4, regeneration concrete constant load crack test charger of the present invention, comprise special-shaped cushion cap 5, two reference columns 6 that can slide in the horizontal direction relative to special-shaped cushion cap 5 are provided with above described special-shaped cushion cap 5, top common support component 9 of two described reference columns 6, the top of described component 9 arranges charger.
Described component 9 is a bar shaped beams of concrete, and its length direction is parallel to the line of described two reference columns 6.
Described charger is used for applying pressure to component 9; Described two reference columns 6 are for supporting the component 9 of top, and its position can adjust according to the size of different component 9, makes two reference columns 6 lay respectively at the below at component 9 two ends with supporting member 9.
After two reference columns 6 and the relative position of component 9 are fixing, the position of adjustable reference column 6 and component 9 entirety, make charger can require according to different loadings to load the diverse location of component 9, realize three branches load or partially load, thus improve the usable range of loading and measurement mechanism.
Particularly, described special-shaped cushion cap 5 is provided with chute 11 along its Width, and described reference column 6 can slide along chute 11.Described chute 11 is arranged with two in parallel.Cross-sectional area 20mm × the 20mm of described special-shaped cushion cap 5 upper hopper chute 11, length is 2200mm, employing same size
section steel manufacture forms.Described reference column 6 slides along chute 11, makes the spacing change between 2 reference columns 6 flexible, easy to operate.
Particularly, described charger comprises and being horizontally disposed with and the girder steel 4 vertical with described component 9, and described girder steel 4 is marked with scale; Described girder steel 4 one end is connected with special-shaped cushion cap 5 by the steel arm 7 vertically arranged, and girder steel 4 is connected with steel arm 7 is movable, installs the weighted platform 3 that can slide along girder steel 4 length direction below the other end of described girder steel 4.The longitudinal section of described girder steel 4 is I shape.
Particularly, the both sides being positioned at girder steel 4 above the bottom surface of described girder steel 4 vertically arrange a pulley 2 respectively, connected by a U-shaped reinforcing bar 18 below pulley 2 described in two, the outside that the top of described U-shaped reinforcing bar 18 is positioned at pulley 2 is connected a vertical reinforcing bar 17, and described vertical reinforcing bar 17 upper end is horizontally disposed with a bolt 16; The weighted platform 3 described in the connection of below of described U-shaped reinforcing bar 18.Further, the subjacent of described girder steel 4 has been horizontally disposed with a steel plate 15, for increasing the rigidity of girder steel 4.
Described pulley 2 can slide along the length direction of girder steel 4 on girder steel 4, and drives described U-shaped reinforcing bar 18 and the weighted platform 3 below it to slide, and when pulley 2 moves to desired location on girder steel 4, fixes pulley 2 by the mode of screwing bolts 16.
Above-mentioned charger utilizes lever principle can be applied on component 9 by the general assembly (TW) of balancing weight amplification certain multiple, whole device forms a self-balancing system, ensure that component 9 load under action of long-term load is invariable, method of operating facilitates feasible, make measurement result more close to actual conditions, the conclusion drawn has more cogency.
Described pulley for changing the position of weighted platform 3 on girder steel 4, thus when the weight of balancing weight is constant, changes the enlargement factor of balancing weight weight, changes the size of the pressure be applied on component 9, thus makes the stressed more flexible of component 9; And girder steel 4 is marked with scale, for accurately reading weighted platform 3 position, be convenient to adopt formula 1 to calculate component 9 pressure.
Alternatively, a distribution beam 10 is provided with between described girder steel 4 and component 9; Be provided with circular shaft bearing 12 and triangular support base 14 between described distribution beam 10 and component 9, described circular shaft bearing 12 and triangular support base 14 are symmetrical arranged about distribution beam 10 centre position.Described girder steel 4 will make a concerted effort to be divided into equal-sized component to load component 9 by distribution beam 10, circular shaft bearing 12 and triangular support base 14.
Described circular shaft bearing 12 and triangular support base 14 are jointly formed and support the freely-supported of distribution beam 10, and the vertical load that distribution beam 10 is born is divided equally and vertically transmits downwards.
Further, the centre position of described distribution beam 10 is positioned at directly over the centre position of component 9, and described circular shaft bearing 12 and triangular support base 14 lay respectively at directly over three branch positions of component 9, ensures that described girder steel 4 pairs of components 9 carry out three branch loadings.
Further, described girder steel 4 inside is provided with steel rib 1, to ensure the rigidity of girder steel 4 to component 9 force place.Described distribution beam 10 inside is provided with steel rib 1, to ensure the rigidity of distribution beam 10.
Further, triangular support base 13 is provided with between described reference column 6 and component 9.The forced position accurately determining component 9 is convenient in the setting of described triangular support base 13.
Further, described girder steel 4 is connected by pin with steel arm 7.Girder steel 4 can be rotated relative to steel arm 7, be convenient to placement member 9 and distribution beam 10 below girder steel 4.
Particularly, described reference column 6 bottom surface is provided with two plain bars 8 along chute 11 length direction, and described plain bar 8 can slide along chute 11.
Described reference column 6 is of a size of 400mm × 400mm × 450mm, its manufacturing process is as follows: adopt four root type number to be φ 10, length is that the deformed bar of 450mm vertically distributes with rhombus, on the steel plate adopting pressure welding method to be welded on above-mentioned reinforcing bar bottom to be of a size of 400mm × 400mm × 10mm, again along the template at steel plate edge, form height is 450mm, then makes it shaping to template cast inside concrete; Finally, bottom steel plate, weld two root type number along chute direction pressure welding method is φ 20, and length is the plain bar of 400mm, and plain bar is placed in chute 11 and ensures that reference column 6 can slide along chute 11.
Described special-shaped cushion cap 5 bottom surface is provided with many bending resistance reinforcing bars, and described bending resistance reinforcing bar cross interlocks, and in net distribution, described bending resistance reinforcing bar is used for bearing in loading procedure, to the huge Bending Moment that special-shaped cushion cap 5 brings, ensures that special-shaped cushion cap 5 normally works.
Described special-shaped cushion cap 5 is symmetrical polygon, alternatively, be provided with 10 limits, be respectively a1 ~ a10, see Fig. 3, the line of described limit a3 and a9 arranges described chute 11, ensures that reference column 6 has sufficiently long displacement on special-shaped cushion cap 5, make reference column 8 can support the component 6 of different size; The part of the special-shaped cushion cap 5 that described limit a5, a6 and a7 surround, makes special-shaped cushion cap 5 be extended along girder steel 4 length direction, thus makes special-shaped cushion cap 5 can bear the moment of flexure brought in loading procedure, ensure the stability of whole experimental provision.
Described special-shaped cushion cap 5 single side size is respectively the polygon deformed bar concrete bearing platform connected of 400mm × 1000mm × 400mm × 1000mm × 600mm × 400mm × 600mm × 1000mm × 400mm × 1000mm, be convenient to formwork make, and save a large amount of spaces while meeting measurement requirement.
Device whole height of the present invention is 1800mm, and the widest part width is 2200mm, and the narrowest place is 400mm, length is 3300mm.
The many Proportional valve load equipments of the long-term crack test of regeneration concrete of the present invention, its concrete load step is as follows:
(1) this test design contrast specimen natural aggregate beams of concrete 1, Replacement rate 50% Recycled Concrete Beams 1,100% Recycled Concrete Beams 2, wherein 1 100% regeneration concrete test specimen carries out short-term loading to determine this batch of test specimen ultimate limit state and serviceability limit stage ultimate limit state.Test method requires to perform in strict accordance with " Standard for test methods of concrete structures " GB50152-92, make three sizes and be 400mm × 400mm × 2000mm, reinforcement manner is vertical muscle 4B12, stirrup φ 8@125, starts to carry out long-term load test research after putting into standard curing room maintenance 28d after being built by three test specimens.
(2) add the dark lubricating oil of 5mm in the chute 11 on special-shaped cushion cap 5, promote two concrete reference columns 6, make spacing inside it be 1600mm, then component 9 is moved on reference column 6.
(3) girder steel 4 is pressed in distribution beam 10 and loads making a concerted effort to be divided into two equal-sized component to carry out three branches to component 9, then on weighted platform 3, balancing weight is loaded, causing loading numerical value change because absorbing water for preventing loading balancing weight in test of long duration process, the concrete blocks of discarded more than 2 years being weighed again and demarcates as loading counterweight.First carry out prestrain during on-test, testing tool normally unloads afterwards, reloads until stop when component normal section fracture width reaches 0.2mm, assert that now test specimen is in serviceability limit state and sustained loading is constant enters the test of long duration phase.The general assembly (TW) of the balancing weight added by three components to be measured is followed successively by G
1=1320kg, G
2=963kg, G
3=832kg, in long-term loading procedure, main measuring content is: (1) experimental enviroment humiture.In view of humiture is on the impact of test component long-term behaviour, humiture change in monitoring test district in test measurement, and take measures to ensure that its fluctuating range is less than in final mean value 10% scope; (2) recycled concrete component normal section crack is measured.First that surface of test piece is white before test, and be divided into the square grid of 5cm × 5cm to observe and record crack situation.Crack progressing and form is recorded, record fracture width numerical value during each observation.
See formula 1:
F
close=G × (L
read÷ L
1) formula 1
F
closerepresent the suffered size of making a concerted effort of component; G represents the weight of added balancing weight
L
1=500mm, L
readfor the reading on girder steel, this tests L
read=4000mm,
Three actual resultant pressures be subject to of component are respectively F
close 1=10560kg, F
close 2=7704kg, F
close 3=6656kg, above-mentioned resultant pressure is 8 times of balancing weight weight, is divided into 1 week the loading phase, within 1 month, 3 months, 1 year, 2 years, is total to double teacher.
Above-mentioned charger shows the advantage of stability and good integrity in the loading of long period, and concrete test findings is as shown in table 1:
Table 1 fracture width contrast table (mm)
| Observation time | 1 day | 1 week | 1 month | 3 months | 1 year | 2 years |
| Normal concrete maximum crack width | 0.180 | 0.205 | 0.225 | 0.245 | 0.250 | 0.260 |
| Normal concrete average crack width | 0.081 | 0.085 | 0.105 | 0.125 | 0.140 | 0.150 |
| 50% regeneration concrete maximum crack width | 0.190 | 0.210 | 0.235 | 0.265 | 0.270 | 0.280 |
| 50% regeneration concrete average crack width | 0.090 | 0.102 | 0.108 | 0.125 | 0.130 | 0.140 |
| 100% regeneration concrete maximum crack width | 0.180 | 0.210 | 0.235 | 0.269 | 0.290 | 0.310 |
| 100% regeneration concrete average crack width | 0.090 | 0.105 | 0.121 | 0.143 | 0.143 | 0.154 |
Claims (8)
1. the many Proportional valve load equipments of the long-term crack test of regeneration concrete, it is characterized in that, comprise special-shaped cushion cap (5), described special-shaped cushion cap (5) top is provided with two reference columns (6) that can slide in the horizontal direction relative to special-shaped cushion cap (5), top common support component (9) of two described reference columns (6), the top of described component (9) arranges charger.
2. the many Proportional valve load equipments of the long-term crack test of regeneration concrete as claimed in claim 1, it is characterized in that, described special-shaped cushion cap (5) is provided with chute (11) along its Width, and described reference column (6) can slide along chute (11).
3. the many Proportional valve load equipments of the long-term crack test of regeneration concrete as claimed in claim 1, it is characterized in that, described charger comprises and being horizontally disposed with and the girder steel (4) vertical with described component (9), and described girder steel (4) is marked with scale; Described girder steel (4) one end is connected with special-shaped cushion cap (5) by the steel arm (7) vertically arranged, and girder steel (4) is connected with steel arm (7) is movable;
The weighted platform (3) that can slide along girder steel (4) length direction is installed below the other end of described girder steel (4).
4. the many Proportional valve load equipments of the long-term crack test of regeneration concrete as claimed in claim 3, it is characterized in that, described girder steel (4) is provided with pulley (2), described pulley (2) can slide along girder steel (4) length direction, and described pulley (2) below connects described weighted platform (3).
5. the many Proportional valve load equipments of the long-term crack test of regeneration concrete as claimed in claim 3, is characterized in that, be provided with a distribution beam (10) between described girder steel (4) and component (9); Be provided with circular shaft bearing (12) and triangular support base (14) between described distribution beam (10) and component (9), described circular shaft bearing (12) and triangular support base (14) are symmetrical arranged about distribution beam (10) centre position.
6. the many Proportional valve load equipments of the long-term crack test of regeneration concrete as claimed in claim 1, is characterized in that, be provided with triangular support base (13) between described reference column (6) and component (9).
7. the many Proportional valve load equipments of the long-term crack test of regeneration concrete as described in as arbitrary in claim 3 to 6, it is characterized in that, described girder steel (4) is connected by pin with steel arm (7).
8. the many Proportional valve load equipments of the long-term crack test of regeneration concrete as described in as arbitrary in claim 1 to 6, is characterized in that, described special-shaped cushion cap (5) is symmetrical polygon.
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| CN105890981B (en) * | 2016-06-23 | 2018-11-06 | 中国航空工业集团公司北京航空材料研究院 | A kind of Izod test device for transparent material |
| CN106679910A (en) * | 2016-12-29 | 2017-05-17 | 交通运输部公路科学研究所 | Test beam long-term loading system and method |
| CN106679910B (en) * | 2016-12-29 | 2018-02-13 | 交通运输部公路科学研究所 | The long-term loading system and method for a kind of test beam |
| CN107664602A (en) * | 2017-10-24 | 2018-02-06 | 山东科技大学 | A kind of mechanical load formula Experiments of Machanics system and application method |
| CN107664602B (en) * | 2017-10-24 | 2024-01-12 | 山东科技大学 | Mechanical loading type mechanical experiment system and use method |
| CN112504587A (en) * | 2020-12-02 | 2021-03-16 | 西安建筑科技大学 | Device and method for testing bending creep strain of concrete continuous beam bridge under lever holding load |
| CN112504587B (en) * | 2020-12-02 | 2022-09-16 | 西安建筑科技大学 | Device and method for testing bending creep strain of concrete continuous beam bridge under lever holding load |
| CN114414405A (en) * | 2022-01-17 | 2022-04-29 | 中国矿业大学 | Vertical force applying equipment and method for open-pit mine rock in-situ test |
| CN114414405B (en) * | 2022-01-17 | 2023-12-05 | 中国矿业大学 | Strip mine rock in-situ test vertical force application device and application method |
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