CN103335897A - Concrete creep test apparatus and method - Google Patents
Concrete creep test apparatus and method Download PDFInfo
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- CN103335897A CN103335897A CN2013102134453A CN201310213445A CN103335897A CN 103335897 A CN103335897 A CN 103335897A CN 2013102134453 A CN2013102134453 A CN 2013102134453A CN 201310213445 A CN201310213445 A CN 201310213445A CN 103335897 A CN103335897 A CN 103335897A
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Abstract
The invention relates to a loading apparatus and a method for a concrete creep test, and aims at solving the problems of too high cost, large occupied space, complex operations and poor loading stability of a conventional creep test apparatus. The apparatus comprises a loading pedestal formed by three steel beams and a set of two-level levers, wherein the two-level levers comprise a first-level lever steel beam and a second-level lever steel beam. Compared with a conventional single-level lever test apparatus, the apparatus provided by the invention has the beneficial effects that by adopting the two-level lever loading mechanism, the lever loading efficiency for the creep test can be greatly increased, the loading lever length is shortened, the size of the balancing weight and the area of the test site can be reduced, requirements for installing hoisting equipment are lowered, and establishment for large-size concrete pedestal test platforms can be saved.
Description
Technical field
The invention belongs to technical field of civil engineering, relate to concrete creep test technology, the charger that is specifically related to the test of a kind of concrete creep with and the creep test method.
Background technology
Concrete creep test is important material test work of field of civil engineering, and its content of the test mainly is by concrete sample being applied long-term constant load, and measures its compressive strain growth in time, thereby determines the concrete characteristic of creeping.
Concrete creep test to the requirement of loading equipemtn is: load is stable, need not adjust load after loading or transfer the lotus number of times the least possible, load range ability big, simple to operate, survey read accurate convenience, be subjected to temperature/humidity influence little, volume is little etc.Because the restriction of technical conditions, the loading equipemtn that satisfies above-mentioned requirements simultaneously is the comparison difficulty.Present creep test charger is broadly divided into 4 kinds of lever, spring, spring lever formula and fluid pressure types.Wherein, the fluid pressure type charger is expensive, uses very limited.And spring and spring lever formula test unit load by spring, easy to operate, volume is less, but the long-term compression deformation meeting of concrete sample causes the spring unloading, thereby cause that the test load that applies changes, therefore need regularly to adjust in the test, concrete sample is carried out ftercompction.This increases the complicacy of test to a certain extent greatly.Load adjustment simultaneously needs carry out according to the actual measured value of concrete sample load, so measuring error can influence the precision of loading, and then influences the reliability of test findings.
The lever charger is to use Creep Loading Equipment comparatively widely at present, by a girder steel nature counterweight is amplified, and presses on the concrete sample.Described leverage one end links to each other with the Reinforced Concrete base stage by steel strand wires, other end lifting balancing weight.This principle of device is simple, and is easy to process, loads to stablize, and duration of test does not need repeatedly to adjust.But, for obtaining test required loading (being generally hundreds of thousand Ns), have problems such as balancing weight is big, lever is long, base plate platform volume of concrete is big, floor area is big usually.
Summary of the invention
For solving too high, the problems such as occupied ground is big, complicated operation, loading less stable of available coagulation soil creep test installation cost, the present invention proposes a kind of charger and method of concrete creep test.
For achieving the above object, technical scheme of the present invention is: a kind of concrete creep test unit, it is characterized in that, comprise three girder steels, described girder steel is layered arrangement spatially, form a loaded seat and a cover two-stage lever, described two-stage lever comprises one-level lever girder steel and second lever girder steel; Wherein, be used for installing concrete sample between loaded seat girder steel and the one-level lever girder steel, the loaded seat girder steel aligns with first end of one-level lever girder steel, and link together by first coupling assembling, second end of loaded seat girder steel arranges the ground counterweight, and the second lever girder steel aligns with second end of base girder steel, and connects by second coupling assembling, the second lever girder steel is by exert pressure second end of one-level lever girder steel of pressure transmission hinged-support, and second end of second lever girder steel is established the test counterweight.
Further, described girder steel all adopts the Two bors d's oeuveres channel cross-section, comprises first channel-section steel and second channel-section steel, first channel-section steel and the second channel-section steel opening positioned opposite, also comprise the connection batten plate between the channel-section steel, wherein be positioned on the connection batten plate at channel-section steel two ends and have anchor hole, be used for the anchoring of coupling assembling.
Further, described coupling assembling comprises finish rolling deformed bar pull bar and ground tackle, and described finish rolling deformed bar pull bar passes the girder steel anchor hole, and utilizes ground tackle to be connected with girder steel.
A kind of concrete creep test method is characterized in that may further comprise the steps:
A, addressing and smooth ground;
Place the base girder steel on b, the ground, and place the ground counterweight at second end of base girder steel;
On c, the loaded seat girder steel concrete sample is installed, the one-level lever girder steel parallel with the loaded seat girder steel is installed above concrete sample, first end of one-level lever girder steel aligns with first end of loaded seat girder steel, and is connected by coupling assembling;
D, one-level lever girder steel second end pressure transmission hinged-support is set, and the second lever girder steel parallel with one-level lever girder steel is installed above the pressure transmission hinged-support, first end of second lever girder steel aligns with second end of loaded seat girder steel and is connected by coupling assembling;
The second end installation test counterweight of e, second lever girder steel.
Further, described counterweight is the reinforced concrete saddle weight.
Beneficial effect of the present invention: concrete creep test unit of the present invention is by adopting the second lever loading structure, than single-stage lever test unit commonly used at present, can significantly improve the lever loading efficiency of creep test, shorten simultaneously and load lever length, reduce balancing weight volume and test site area, also can reduce the requirement that hoisting device is installed, but also the construction that can save mass concrete base test platform.
Description of drawings
Fig. 1 is the test unit structure principle chart of embodiments of the invention;
Fig. 2 is steel beam structure schematic diagram embodiment illustrated in fig. 1;
Fig. 3 is the sectional view of girder steel shown in Figure 2;
Fig. 4 is the structure principle chart of pressure transmission hinged-support.
Description of reference numerals: girder steel 11, the first channel-section steels 111, the second channel-section steels 112, connect batten plate 12, anchoring hole slot 13, scale 14, coupling assembling 21, finish rolling deformed bar pull bar 211, ground tackle 212, pressure transmission hinged-support 22, backup rolls 221, billet 222, limit stick 223, ground counterweight 31, pre-buried duct 311, test counterweight 32, concrete sample 4.
Embodiment
Below in conjunction with drawings and Examples the present invention is further described.
As shown in Figure 1, a kind of concrete creep test unit of body embodiments,
Comprise three girder steels 11, described girder steel is layered arrangement spatially, form a loaded seat and a cover two-stage lever, namely three girder steels 11 are parallel to each other is positioned at same perpendicular, press differing heights and distribute, and regulation is followed successively by loaded seat girder steel, one-level lever bar girder steel and second lever girder steel from bottom to top.Described two-stage lever comprises one-level lever girder steel and second lever girder steel; Wherein, be used for installing concrete sample 4 between loaded seat girder steel and the one-level lever girder steel, concrete sample 4 is tested concrete and surveys concrete sample, the loaded seat girder steel aligns with first end of one-level lever girder steel, and link together by first coupling assembling 21, second end of loaded seat girder steel arranges ground counterweight 31, the second lever girder steel aligns with second end of base girder steel, and by 21 connections of second coupling assembling, the second lever girder steel is by exert pressure second end of one-level lever girder steel of pressure transmission hinged-support 22, and second end of second lever girder steel is established test counterweight 32.In the present embodiment, counterweight adopts the joints cement pier to realize, because ground counterweight 31 need press second end of first lever crossbeam, so in ground counterweight 31, need pre-pipe laying 311, so that can passing counterweight, coupling assembling 21 realizes being connected of first lever crossbeam and the 3rd lever crossbeam.
As shown in Figures 2 and 3, described girder steel 11 all adopts the Two bors d's oeuveres channel cross-section, comprise first channel-section steel 111 and second channel-section steel 112, first channel-section steel 111 and second channel-section steel, 112 openings are staggered relatively, also comprise the connection batten plate 12 between the channel-section steel, described first channel-section steel links together by being connected batten plate 12 with second channel-section steel, wherein is positioned on the connection batten plate at channel-section steel two ends to have anchor hole, is used for the anchoring of coupling assembling.
In order to reduce the difficulty of perforate, can when first channel-section steel and the splicing of second channel-section steel, reserve certain clearance between two blocks of channel-section steels, so that the finish rolling deformed bar pull bar 211 of coupling assembling 21 passes.The size in gap is also because deciding for the diameter of the finish rolling deformed bar pull bar 211 that is connected and fixed.For the device that makes present embodiment has the adjustment space when the load test, described anchor hole is set to anchoring hole slot 13, i.e. anchoring hole slot 13 as described in Figure 2, this anchoring hole slot is for connecting the groove shape through hole (the groove shape through hole of reserving in the time of also can being two channel-section steels splicings) that batten plate upper edge lever arm direction is offered.In the present embodiment, for make load load adjusting more quick and precisely, also have the scale 14 that is used to indicate ground tackle position on the lever girder steel on the anchoring hole slot 13, be used for auxiliary quick adjustment load to meeting the requirements.
As Fig. 1, Fig. 2 and shown in Figure 3, present embodiment also provides a kind of coupling assembling 21, and this coupling assembling comprises finish rolling deformed bar pull bar 211 and ground tackle 212, and the anchor hole that finish rolling deformed bar pull bar 211 passes girder steel is anchored by ground tackle and lever crossbeam 11.
As Fig. 1, Fig. 2, Fig. 3 and shown in Figure 4, in order to improve the accuracy that load loads, the concrete creep test unit of present embodiment comprises a pressure transmission hinged-support 22 between second lever crossbeam and concrete sample 4, also transmit pressure by a pressure transmission hinged-support 22 between second lever crossbeam and the 3rd lever crossbeam.Described pressure transmission hinged-support 22 comprises backup rolls 221 and billet 222, described billet 222 is dull and stereotyped steel disc, and backup rolls 221 is a round steel, and described billet is positioned at the relative both sides of backup rolls, contact with pressure-bearing surface with the face of exerting pressure respectively, effect is to make acting force more even.Backup rolls is between billet, and its role is to make between force application object and the stressed object is the line contact, so guarantee when carrying out the LOAD FOR that lever exerts pressure more consistent with calculated value, the reduction systematic error.Cause structural instability in order to prevent that backup rolls from rolling, the pressure transmission hinged-support of present embodiment further comprises limit stick 223, and described limit stick 223 is welded in respectively and is positioned at the backup rolls two sides, is used for preventing that backup rolls from rolling.
In conjunction with above-mentioned concrete creep test unit, present embodiment further provides a kind of concrete creep test method, it is characterized in that may further comprise the steps:
A, addressing and smooth ground;
Place the base girder steel on b, the ground, and place the ground counterweight at second end of base girder steel;
On c, the loaded seat girder steel concrete sample is installed, the one-level lever girder steel parallel with the loaded seat girder steel is installed above concrete sample, first end of one-level lever girder steel aligns with first end of loaded seat girder steel, and is connected by coupling assembling;
D, one-level lever girder steel second end pressure transmission hinged-support is set, and the second lever girder steel parallel with one-level lever girder steel is installed above the pressure transmission hinged-support, first end of second lever girder steel aligns with second end of loaded seat girder steel and is connected by coupling assembling;
The second end installation test counterweight of e, second lever girder steel.
Wherein counterweight is the concreting piece.
The concrete creep test unit of above embodiment and the test method structure by adopting multi-grade lever to load, solved creep proving installation or cost is too high or occupied ground is big of available coagulation soil, construction is complicated, load shakiness etc. problem, stable than loading, single-stage lever test unit with low cost has significantly reduced to load the lever length of usefulness, while balancing weight volume, the occupied ground area also significantly dwindles with respect to single-stage lever test unit, installation process reduces the requirement of hoisting device, reduction by a relatively large margin the concrete creep test cost and improve loading efficiency.
The above is the specific embodiment of the present invention only, one skilled in the art will appreciate that can carry out various modifications, replacement and change to the present invention in the disclosed technical scope of the present invention.Therefore the present invention should not limited by above-mentioned example, and should limit with the protection domain of claims.
Claims (10)
1. a concrete creep test unit is characterized in that, comprises three girder steels, and described girder steel is layered arrangement spatially, forms a loaded seat and a cover two-stage lever, and described two-stage lever comprises one-level lever girder steel and second lever girder steel; Wherein, be used for installing concrete sample between loaded seat girder steel and the one-level lever girder steel, the loaded seat girder steel aligns with first end of one-level lever girder steel, and link together by first coupling assembling, second end of loaded seat girder steel arranges the ground counterweight, and the second lever girder steel aligns with second end of base girder steel, and connects by second coupling assembling, the second lever girder steel is by exert pressure second end of one-level lever girder steel of pressure transmission hinged-support, and second end of second lever girder steel is established the test counterweight.
2. a kind of concrete creep test unit according to claim 1, it is characterized in that, described girder steel all adopts the Two bors d's oeuveres channel cross-section, comprise first channel-section steel and second channel-section steel, first channel-section steel and the second channel-section steel opening positioned opposite, also comprise the connection batten plate between the channel-section steel, wherein be positioned on the connection batten plate at channel-section steel two ends and have anchor hole, be used for the anchoring of coupling assembling.
3. a kind of concrete creep test unit according to claim 2 is characterized in that, has the gap between described first channel-section steel and second channel-section steel.
4. a kind of concrete creep test unit according to claim 2 is characterized in that, described anchor hole is the anchoring hole slot, and described anchoring hole slot is for connecting the groove shape through hole that batten plate upper edge lever arm direction is offered.
5. a kind of concrete creep test unit according to claim 2 is characterized in that, has the scale that is used to indicate ground tackle position on the lever girder steel on the described anchoring hole slot.
6. a kind of concrete creep test unit according to claim 1 is characterized in that described coupling assembling comprises finish rolling deformed bar pull bar and ground tackle, and described finish rolling deformed bar pull bar passes lever girder steel anchor hole, and utilizes ground tackle to be connected with girder steel.
7. according to the described a kind of concrete creep test unit of each claim of claim 1-6, it is characterized in that, between second lever crossbeam and concrete sample, comprise the pressure transmission hinged-support, described pressure transmission hinged-support comprises backup rolls and billet, described billet is dull and stereotyped steel disc, backup rolls is round steel, and described billet is positioned at the backup rolls both sides, contacts with pressure-bearing surface with the face of exerting pressure respectively.
8. according to the described a kind of concrete creep test unit of each claim of claim 1-6, it is characterized in that, comprise the pressure transmission hinged-support between described second lever crossbeam and the 3rd lever crossbeam, be used for transmitting pressure.
9. concrete creep test method is characterized in that may further comprise the steps:
A, addressing and smooth ground;
Place the base girder steel on b, the ground, and place the ground counterweight at second end of base girder steel;
On c, the loaded seat girder steel concrete sample is installed, the one-level lever girder steel parallel with the loaded seat girder steel is installed above concrete sample, first end of one-level lever girder steel aligns with first end of loaded seat girder steel, and is connected by coupling assembling;
D, one-level lever girder steel second end pressure transmission hinged-support is set, and the second lever girder steel parallel with one-level lever girder steel is installed above the pressure transmission hinged-support, first end of second lever girder steel aligns with second end of loaded seat girder steel and is connected by coupling assembling;
The second end installation test counterweight of e, second lever girder steel.
10. a kind of concrete creep test method according to claim 9 is characterized in that described counterweight is the reinforced concrete saddle weight.
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Cited By (17)
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|---|---|---|---|---|
| CN104034609A (en) * | 2014-06-04 | 2014-09-10 | 许昌学院 | Test method for researching influence of stress gradient on creep property of concrete beam |
| CN104181033A (en) * | 2014-08-26 | 2014-12-03 | 华中科技大学 | Gravity load amplifier |
| CN104677745A (en) * | 2015-03-27 | 2015-06-03 | 重庆交通大学 | Concrete lever type tension-compression creep device provided with static pulley |
| CN105486840A (en) * | 2015-12-28 | 2016-04-13 | 中国科学院武汉岩土力学研究所 | Solidification and permeation combined experimental device |
| CN105510158A (en) * | 2016-01-11 | 2016-04-20 | 河南理工大学 | Anchor solid dynamic tensile testing device and method |
| 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 |
| CN107621402A (en) * | 2017-10-11 | 2018-01-23 | 太原理工大学 | A kind of lever Analysis of Concrete Tensile Creep Loading Equipment |
| CN107748108A (en) * | 2017-10-16 | 2018-03-02 | 河海大学 | It is a kind of to determine experimental rig and the method for testing that Analysis of Concrete Tensile is crept |
| CN107860644A (en) * | 2017-10-11 | 2018-03-30 | 太原理工大学 | It is a kind of can simulating natural environment condition concrete creep test apparatus |
| CN107884268A (en) * | 2017-10-11 | 2018-04-06 | 太原理工大学 | Consider the Creep of Concrete-filled Steel Tube test device of steel pipe primary stress |
| CN108072567A (en) * | 2017-12-08 | 2018-05-25 | 广州特种承压设备检测研究院 | A kind of plastics constant temperature stress etching experiment device and method |
| CN108106939A (en) * | 2017-12-22 | 2018-06-01 | 中原工学院 | A kind of gravity compensation formula anchoring body creep effect pilot system based on lever principle |
| CN108896406A (en) * | 2018-09-25 | 2018-11-27 | 贵州顺康路桥咨询有限公司 | A kind of concrete crushing strength and shrinkage and creep testing equipment |
| CN110470542A (en) * | 2019-09-12 | 2019-11-19 | 辽宁科技大学 | Hold lotus reinforced beam durability loading device |
| CN113310811A (en) * | 2021-04-21 | 2021-08-27 | 北京工业大学 | Cement-based material axial pressure creep testing device capable of regulating temperature, humidity and load |
| CN113532691A (en) * | 2021-07-15 | 2021-10-22 | 威海建设集团股份有限公司 | Bulky concrete temperature automatic acquisition and cooling processing system thereof |
| CN114112671A (en) * | 2021-11-26 | 2022-03-01 | 西南交通大学 | Creep test piece for simultaneously measuring component-level multi-stress sections and test method thereof |
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| CN104034609A (en) * | 2014-06-04 | 2014-09-10 | 许昌学院 | Test method for researching influence of stress gradient on creep property of concrete beam |
| CN104034609B (en) * | 2014-06-04 | 2016-05-11 | 许昌学院 | A kind of test method of stress gradient on the impact of beams of concrete Creep Characteristics of studying |
| CN104181033A (en) * | 2014-08-26 | 2014-12-03 | 华中科技大学 | Gravity load amplifier |
| CN104677745A (en) * | 2015-03-27 | 2015-06-03 | 重庆交通大学 | Concrete lever type tension-compression creep device provided with static pulley |
| CN104677745B (en) * | 2015-03-27 | 2017-03-01 | 重庆交通大学 | A kind of concrete lever tension and compression creep equipment with quiet pulley |
| CN105486840A (en) * | 2015-12-28 | 2016-04-13 | 中国科学院武汉岩土力学研究所 | Solidification and permeation combined experimental device |
| CN105486840B (en) * | 2015-12-28 | 2018-08-14 | 中国科学院武汉岩土力学研究所 | A kind of consolidation infiltration Collaborative experiment device |
| CN105510158B (en) * | 2016-01-11 | 2018-04-03 | 河南理工大学 | Anchoring body dynamic tensile test device and experimental method |
| CN105510158A (en) * | 2016-01-11 | 2016-04-20 | 河南理工大学 | Anchor solid dynamic tensile testing device 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 |
| 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 |
| CN107621402A (en) * | 2017-10-11 | 2018-01-23 | 太原理工大学 | A kind of lever Analysis of Concrete Tensile Creep Loading Equipment |
| CN107860644A (en) * | 2017-10-11 | 2018-03-30 | 太原理工大学 | It is a kind of can simulating natural environment condition concrete creep test apparatus |
| CN107884268B (en) * | 2017-10-11 | 2019-10-11 | 太原理工大学 | Consider the Creep of Concrete-filled Steel Tube test device of steel pipe primary stress |
| CN107884268A (en) * | 2017-10-11 | 2018-04-06 | 太原理工大学 | Consider the Creep of Concrete-filled Steel Tube test device of steel pipe primary stress |
| CN107860644B (en) * | 2017-10-11 | 2019-11-12 | 太原理工大学 | A kind of concrete creep test apparatus of analog natural environmental condition |
| CN107748108A (en) * | 2017-10-16 | 2018-03-02 | 河海大学 | It is a kind of to determine experimental rig and the method for testing that Analysis of Concrete Tensile is crept |
| CN108072567A (en) * | 2017-12-08 | 2018-05-25 | 广州特种承压设备检测研究院 | A kind of plastics constant temperature stress etching experiment device and method |
| CN108106939A (en) * | 2017-12-22 | 2018-06-01 | 中原工学院 | A kind of gravity compensation formula anchoring body creep effect pilot system based on lever principle |
| CN108106939B (en) * | 2017-12-22 | 2020-10-20 | 中原工学院 | Gravity compensation type anchoring body creep effect test system based on lever principle |
| CN108896406A (en) * | 2018-09-25 | 2018-11-27 | 贵州顺康路桥咨询有限公司 | A kind of concrete crushing strength and shrinkage and creep testing equipment |
| CN110470542A (en) * | 2019-09-12 | 2019-11-19 | 辽宁科技大学 | Hold lotus reinforced beam durability loading device |
| CN110470542B (en) * | 2019-09-12 | 2024-03-08 | 辽宁科技大学 | Durable loading device for load-holding reinforced concrete beam |
| CN113310811A (en) * | 2021-04-21 | 2021-08-27 | 北京工业大学 | Cement-based material axial pressure creep testing device capable of regulating temperature, humidity and load |
| CN113310811B (en) * | 2021-04-21 | 2024-01-26 | 北京工业大学 | Cement-based material axial pressure creep testing device capable of regulating temperature, humidity and load |
| CN113532691A (en) * | 2021-07-15 | 2021-10-22 | 威海建设集团股份有限公司 | Bulky concrete temperature automatic acquisition and cooling processing system thereof |
| CN113532691B (en) * | 2021-07-15 | 2024-05-28 | 威海建设集团股份有限公司 | Automatic temperature collection and cooling treatment system for mass concrete |
| CN114112671A (en) * | 2021-11-26 | 2022-03-01 | 西南交通大学 | Creep test piece for simultaneously measuring component-level multi-stress sections and test method thereof |
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Application publication date: 20131002 |