CN107271648B - Consider the shrinkage stress measuring device that concrete creep influences - Google Patents

Consider the shrinkage stress measuring device that concrete creep influences Download PDF

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Publication number
CN107271648B
CN107271648B CN201710560263.1A CN201710560263A CN107271648B CN 107271648 B CN107271648 B CN 107271648B CN 201710560263 A CN201710560263 A CN 201710560263A CN 107271648 B CN107271648 B CN 107271648B
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China
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plate
concrete
shrinkage stress
test specimen
steel
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CN107271648A (en
Inventor
尚仁杰
曾滨
寅志强
许庆
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Central Research Institute of Building and Construction Co Ltd MCC Group
China Jingye Engineering Corp Ltd
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Central Research Institute of Building and Construction Co Ltd MCC Group
China Jingye Engineering Corp Ltd
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/38Concrete; ceramics; glass; bricks
    • G01N33/383Concrete, cement

Abstract

The invention discloses the shrinkage stress measuring devices for considering that concrete creep influences, it includes: square frame-shaped rigid mount, test specimen supporting steel plate, two anchoring type connectors and two tension sensors being welded by two steel compression legs and two pieces of steel end plates;It mutually welds inside of the two sides of the test specimen supporting steel plate respectively with two steel compression legs, the inside of two pieces of steel end plates is connected separately with the tension sensor by bolt and nut, and two tension sensors are separately connected the anchoring type connector by bolt.The present invention considers that the shrinkage stress measuring device that concrete creep influences, structure are simple, easy to use.

Description

Consider the shrinkage stress measuring device that concrete creep influences
Technical field
The present invention relates to concrete field of measuring technique, in particular to a kind of shrinkage stress for considering concrete creep and influencing Measuring device.
Background technique
Cement in concrete can generate contraction in hydration process, and the corresponding concrete structure to suffer restraints shrinks meeting The tensile stress for causing concrete causes the cracking of concrete slab, beams of concrete.Therefore, " Code for design of concrete structures " The clear stipulaties length of concrete structure in GB500010-2011.If length has been more than specification specified value, concrete due to Too long, the constraint of the vertical pillar and shear wall that are subject to is excessive, and tensile stress caused by concrete shrinkage and temperature, which crosses conference, to be made to mix Xtah Crude Clay structure generates crack, therefore, needs to take measures to control the cracking of concrete when being more than measured lengths.
Currently, almost all of experimental data is all the shrinkage of concrete in a free state, if according to this receipts Contracting amount, which calculates the stress that concrete shrinkage generates, can be far longer than actual value, it is important to due to creeping for concrete, that is, with The extension of time, the stress under same strain can be gradually reduced, and Creep Coefficient with concrete strength be gradually increased by It is decrescence small, it is one with the value of time change, the contraction of concrete is also how to measure consideration Xu as the time is changing The concrete shrinkage stress that becoming influences is always the problem of perplexing everybody, and there is presently no see the coagulation for measuring and considering to creep The measuring device of native shrinkage stress.
Summary of the invention
The purpose of the present invention is to provide a kind of structures, and contraction that consideration concrete creep simple, easy to use influences is answered Force measuring device.
For achieving the above object, the present invention adopts the following technical scheme:
Consider the shrinkage stress measuring device that concrete creep influences, which is characterized in that it include: by two steel compression legs and Square frame-shaped rigid mount, test specimen supporting steel plate, two anchoring type connectors and two tension sensors that two pieces of steel end plates are welded into; Inside of the two sides of the test specimen supporting steel plate respectively with two steel compression legs is mutually welded, the inside of two pieces of steel end plates It is connected separately with the tension sensor by bolt and nut, two tension sensors are separately connected one by bolt A anchoring type connector.
The tension sensor is spoke type strain tension sensor.
Rubber pad is equipped on the test specimen supporting steel plate.
The rubber pad is two layers.
The anchoring type connector by end connecting plate, two pieces of end side connecting plates and 4~6 radicles connect reinforcement welding and At, two pieces of end side connecting plates are vertical with the end connecting plate and are respectively welded on the forward and backward side of the end connecting plate, The end connection reinforcing bar is vertical with the end connecting plate and is welded on the end connecting plate.
It further includes a data collecting instrument, and two tension sensors pass through data line respectively and the data acquire Instrument connection.
The rubber pad is equipped with concrete sample, and the both ends of the concrete sample are connected with anchoring type connector respectively It connects.
The length of the concrete sample is no less than 4 meters.
After the square frame-shaped rigid mount is connect with two tension sensors, two anchoring type connectors and test specimen supporting steel plate Overall stiffness not less than 20 times of rigidity of concrete sample.
The beneficial effect of the technical scheme provided by the present invention is that:
The present invention considers the shrinkage stress measuring device that concrete creep influences, it includes: by two steel compression legs and two pieces Square frame-shaped rigid mount, test specimen supporting steel plate, two anchoring type connectors and two tension sensors that steel end plate is welded into;It is described Inside of the two sides of test specimen supporting steel plate respectively with two steel compression legs is mutually welded, and is passed through on the inside of two pieces of steel end plates Bolt and nut is connected separately with the tension sensor, and two tension sensors are separately connected an institute by bolt State anchoring type connector.In use, concrete sample is poured between two anchoring type connectors, from being completed casting concrete sample The value of thrust of two tension sensors, the average value and coagulation of the value of thrust of two tension sensors are acquired by tension sensor The ratio between sectional area of native test specimen is the shrinkage stress of concrete sample, and continuous acquisition 2 years obtained each shrinkage stresses are to examine Consider the shrinkage stress that concrete creep influences.It can be seen that the present invention considers that the shrinkage stress that concrete creep influences measures dress It is simple to set structure, it is easy to use.
Detailed description of the invention
Fig. 1 is schematic structural view of the invention.
Fig. 2 is schematic cross-sectional view of the present invention.
Appended drawing reference: 1-steel compression leg;2-steel end plates;3, test specimen supporting steel plate;4-tension sensors;5-bolts; 6-nuts;7-concrete samples;8-rubber pads;9-end connecting plates;10-end side connecting plates;11-ends connect steel Muscle;12-data collecting instruments;13-data lines.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention Formula is described in further detail.
As shown in Figure 1 and Figure 2, the present invention considers the shrinkage stress measuring device that concrete creep influences, it includes: by two 3, two square frame-shaped rigid mount that root steel compression leg 1 and two pieces of steel end plates 2 are welded into, test specimen supporting steel plate anchoring type connectors and two A tension sensor 4;Inside of the two sides of the test specimen supporting steel plate 3 respectively with two steel compression legs 1 is mutually welded, and two pieces The inside of the steel end plate 2 is connected separately with the tension sensor 4, two pull sensing by 5 nut 6 of bolt Device 4 is separately connected the anchoring type connector by bolt.
The tension sensor 4 is spoke type strain tension sensor.
Rubber pad 8 is equipped on the test specimen supporting steel plate 3.
The rubber pad 8 is two layers.
The anchoring type connector connects reinforcing bar 11 by 9, two pieces of radicles of end side connecting plate 10 and 4~6 of end connecting plate and welds Connect, two pieces of end side connecting plates 10 it is vertical with the end connecting plate 9 and before being respectively welded at the end connecting plate 9, On back, the end connection reinforcing bar 11 is vertical with the end connecting plate 9 and is welded on the end connecting plate 9.
It further includes a data collecting instrument 12, and two tension sensors 4 pass through data line 13 and the number respectively It is connected according to Acquisition Instrument 12.
The rubber pad 8 be equipped with concrete sample 7, the both ends of the concrete sample 7 respectively with anchoring type connector It is connected.The concrete sample 7 forms for cast-in-site, and the end connection reinforcing bar 11 of the anchoring type connector is embedded at described In concrete sample 7, the inside of the inside of the end connecting plate 9 of the anchoring type connector and end side connecting plate 10 respectively with it is described 7 phase of concrete sample bonding.
The length of the concrete sample 7 is 4 meters or longer.The longer effect of the length of concrete sample 7 is better, accordingly The cost of measuring device also can be higher.
After the square frame-shaped rigid mount is connect with two tension sensors, two anchoring type connectors and test specimen supporting steel plate Overall stiffness be 20 times or 20 times or more of rigidity of concrete sample, the square frame-shaped rigid mount and two pull sensing The constraint more connect that overall stiffness more high concrete test specimen after device, two anchoring type connectors and the connection of test specimen supporting steel plate is subject to Nearly Complete Bind, measurement result is more accurate, but the cost of corresponding measuring device also can be higher.
The present invention considers the shrinkage stress measuring device that concrete creep influences, and can also be used as and considers what swelling agent influenced Shrinkage stress measuring device.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.

Claims (4)

1. considering the shrinkage stress measuring device that concrete creep influences, which is characterized in that it includes: by two steel compression legs and two Square frame-shaped rigid mount, test specimen supporting steel plate, two anchoring type connectors and two tension sensors that block steel end plate is welded into;Institute It states inside of the two sides of test specimen supporting steel plate respectively with two steel compression legs mutually to weld, the inside of two pieces of steel end plates is logical It crosses bolt and nut and is connected separately with the tension sensor, two tension sensors are separately connected one by bolt The anchoring type connector;
The anchoring type connector is formed by end connecting plate, two pieces of end side connecting plates and 4~6 radicles connection reinforcement welding, and two End side connecting plate described in block is vertical with the end connecting plate and is respectively welded on the forward and backward side of the end connecting plate, institute It is vertical with the end connecting plate and be welded on the end connecting plate to state end connection reinforcing bar;
Rubber pad is equipped on the test specimen supporting steel plate;
The rubber pad is equipped with concrete sample, and the both ends of the concrete sample are connected with anchoring type connector respectively;
The length of the concrete sample is no less than 4 meters;
The square frame-shaped rigid mount connect with two tension sensors, two anchoring type connectors and test specimen supporting steel plate after it is whole Body rigidity is not less than 20 times of the rigidity of concrete sample.
2. the shrinkage stress measuring device according to claim 1 for considering concrete creep and influencing, which is characterized in that described Tension sensor is spoke type strain tension sensor.
3. the shrinkage stress measuring device according to claim 1 for considering concrete creep and influencing, which is characterized in that described Rubber pad is two layers.
4. the shrinkage stress measuring device according to claim 1 for considering concrete creep and influencing, which is characterized in that it is also Including a data collecting instrument, two tension sensors pass through data line respectively and connect with the data collecting instrument.
CN201710560263.1A 2017-07-11 2017-07-11 Consider the shrinkage stress measuring device that concrete creep influences Active CN107271648B (en)

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CN108761048A (en) * 2018-05-30 2018-11-06 重庆大学 A kind of complete set of equipments for detecting concrete shrinkage stress

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1247983C (en) * 2004-01-19 2006-03-29 哈尔滨工业大学 Concrete early shrinkage stress tester
CN1270170C (en) * 2004-07-30 2006-08-16 哈尔滨工业大学 Device for measuring early shrinkage stress of concrefe
CN2857009Y (en) * 2005-07-13 2007-01-10 同济大学 Constrained contraction testing machine for concrete
CN201035000Y (en) * 2007-04-27 2008-03-12 同济大学 Concrete active constraint shrinkage test machine
CN101221164B (en) * 2008-01-16 2011-04-13 哈尔滨工业大学 Cement concrete self-restriction contraction stress test approach
CN101738459B (en) * 2010-01-25 2014-06-18 江苏苏博特新材料股份有限公司 Expansion/shrinkage stress testing device for cement-based material
CN103149100A (en) * 2013-02-18 2013-06-12 东南大学 Concrete axis stretching creep tester and test method thereof
CN203148937U (en) * 2013-03-13 2013-08-21 浙江建设职业技术学院 System for testing self-constriction of early-age concrete
CN203719614U (en) * 2014-02-12 2014-07-16 常州工学院 Concrete free swell ratio and shrinking ratio testing device
CN103837413B (en) * 2014-03-07 2017-01-25 中南大学 Concrete tensile creep testing device and concrete shrinkage stress creep testing method
CN203881765U (en) * 2014-05-25 2014-10-15 长安大学 Concrete self-contraction measuring device
CN106771097A (en) * 2016-12-16 2017-05-31 中国建筑材料科学研究总院 Concrete shrinkage and drying shrinkage pressure tester and test method
CN106932559A (en) * 2017-04-06 2017-07-07 燕山大学 A kind of test method for evaluating cement paste shrinkage

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