CN105510132A - Sustained load application device and method for concrete chemically planted bar - Google Patents
Sustained load application device and method for concrete chemically planted bar Download PDFInfo
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- CN105510132A CN105510132A CN201510891679.2A CN201510891679A CN105510132A CN 105510132 A CN105510132 A CN 105510132A CN 201510891679 A CN201510891679 A CN 201510891679A CN 105510132 A CN105510132 A CN 105510132A
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- spring
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- backing plate
- cover plate
- concrete
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
Abstract
The invention provides a sustained load application device and method for a concrete chemically planted bar. A backing plate and a bearing cover plate of the load application device can be fixed after the space between the backing plate and the bearing cover plate is adjusted; a pressure sensor, a jack, a concrete planted bar test piece and a spring backing plate are sequentially and coaxially placed between the backing plate and the bearing cover plate from bottom to top; one end of an anchor bar is inserted into the concrete planted bar test piece; threads are formed in the free end of the anchor bar, which extends out of the bearing cover plate; a spring sleeves the anchor bar and is clamped between the concrete planted bar test piece and the spring backing plate. The sustained load application process is as follows: the space between the bearing cover plate and the backing plate is set, the jack pressurizes to obtain the preset pressure, the spring backing plate is supported on the bearing cover plate, the spring is compressed to be shorter, the threads in the free end of the anchor bar are exposed out, an anchoring nut is mounted and tightened till the reading of the pressure sensor is zero, an integral test piece consisting of the concrete planted bar test piece, the compressed spring, the spring backing plate and the anchoring nut is taken out to complete sustained load application. The equipment structure is simple, load application is easy, and mass operation can be realized.
Description
Technical field
The present invention relates to chemistry of concrete bar planting continuing load bringing device and applying method thereof.
Background technology
Chemical method bar planting is called for short bar planting, is effective reinforcement again, is the linking technical ability of anchoring application construction glue effect after the current a kind of reinforcing bar built on structure aseismatic reinforcement engineering.Intend using bar gauge with suitable bore diameter and the degree of depth according to engineering on existing xoncrete structure or component, adopt chemical adhesive make the plan reinforcing bar that increases newly and former concrete conglutination firm, make newly-increased reinforcing bar as embedded bar, the intensity of reinforcing bar is fully utilized, and plays to the performance desired by design.In view of the widespread use of embedding re-bar technique in construction work, bar planting performance just seems particularly important.Significant to research for the concrete drawing experimental features under continuing load during bar planting performance study.Publication number is CN102998174A, and name is called the patented claim of the long-term charger of a kind of concrete sample endurancing.By reaction frame, test specimen, iron and steel sliding panel, butterfly spring, counter-force nut, slide bolt, the device that sensor parts are formed.This device can apply pressure load and moment load to test specimen, but too high to the performance requirement of reaction frame, and experimentation cost significantly promotes.
Summary of the invention
The object of the invention is, in order to overcome above problem, to provide chemistry of concrete bar planting continuing load bringing device and applying method thereof.
To achieve these goals, the present invention is by the following technical solutions:
Chemistry of concrete bar planting continuing load bringing device, comprises backing plate and load cover plate, and both pass through load screw rod and the nut space distance control at four angles; Between backing plate and load cover plate, placement force sensor, lifting jack, planting reinforced bar into concrete test specimen, spring, spring backing plate successively from bottom to up, planting reinforced bar into concrete test specimen is inserted in dowel one end, and free end is provided with screw thread and stretches out load cover plate; Spring is placed on dowel, is stuck between planting reinforced bar into concrete test specimen and spring backing plate; Backing plate, load cover plate, lifting jack, dowel, spring require coaxial setting;
Described spring backing plate center drilling, aperture is less than spring inside diameter, and is greater than the external diameter of bolt type dowel;
The perforate of described load cover plate central, aperture should be less than spring pad board size and be greater than anchoring nut size.
Described chemistry of concrete bar planting continuing load bringing device, spring inside diameter is not less than 30mm.
Described chemistry of concrete bar planting continuing load bringing device, described backing plate, load cover plate, spring backing plate adopts steel matter.
Described chemistry of concrete bar planting continuing load bringing device, load screw rod clear spacing is greater than concrete sample size.
Chemistry of concrete bar planting continuing load applying method, step is as follows:
(1) first load screw rod and backing plate are fixed, on load screw rod, then install the downside nut of load cover plate, height of nut meets the space requirement that test specimen is installed; Load cover plate is installed, then the upside nut of load cover plate is installed, after nut screwing clamping, the spacing of fixing slide cover and backing plate;
(2) between load cover plate and backing plate, from the bottom to top, coaxial setting pressure sensor, lifting jack, planting reinforced bar into concrete test specimen, spring, spring backing plate successively, dowel free end stretches out spring backing plate;
(3) lifting jack cylinder body stretches out pressurization, and test specimen moves, until spring shim is supported on load cover plate, now spring starts pressurized, and its length shortens, lifting jack persistent pressure, until pressure sensor readings reaches preset pressure, stops pressurization;
(4) install anchoring nut at dowel free end screw thread place, being screwed to pressure transducer reading is 0; Now, spring is to the reversed load that dowel provides the payload values that lifting jack applies;
(5) lifting jack cylinder body retraction, the overall test specimen that test specimen, the spring by compressing, spring backing plate, dowel, anchoring nut form being taken out, completing the applying to test specimen continuing load, in this overall test specimen, because spring is in pressured state, provide lasting pulling force to dowel.
The present invention is applicable to performance pull-out test under planting reinforced bar into concrete long duration load, can in building site, and the scenes, the ground side of adding such as exposure test station load, and the structure of equipment is simple, is easy to load application, can operates in batches, reduces error.
Accompanying drawing explanation
Fig. 1 is the structural representation of load bringing device of the present invention.
Fig. 2 is the assembling schematic diagram of load bringing device of the present invention.
Fig. 3 is the loading schematic diagram of load bringing device of the present invention.
Fig. 4 is the unloading schematic diagram of load bringing device of the present invention.
The overall test specimen schematic diagram that Fig. 5 is planting reinforced bar into concrete test specimen of the present invention, the spring by compressing, spring backing plate, anchoring nut form.
The explanation of main mark in accompanying drawing: 1-backing plate, 2-load screw rod, 3-pressure transducer, 4-lifting jack, 5-planting reinforced bar into concrete test specimen, 6-spring, 7-dowel, 8-spring backing plate, nut on the downside of 9-load cover plate, 10-load cover plate, nut on the upside of 11-load cover plate, 12-anchoring nut, 13-pressure sensor readings instrument, 14-lifting jack controller.
Embodiment
the embodiment now provided by reference to the accompanying drawings and below, illustrates technical scheme of the present invention.
In embodiment, the planting reinforced bar into concrete test specimen of institute's load application is diameter 120mm, high 160mm right cylinder.
Embodiment 1
Fig. 1 is the structural representation of load bringing device of the present invention, Fig. 2 is the assembling schematic diagram of load bringing device of the present invention, Fig. 3 is the loading schematic diagram of load bringing device of the present invention, Fig. 4 is the unloading schematic diagram of load bringing device of the present invention, the overall test specimen schematic diagram that Fig. 5 is planting reinforced bar into concrete test specimen of the present invention, the spring by compressing, spring backing plate, anchoring nut form.
With reference to shown in Fig. 1,2,3,4,5, load bringing device comprises backing plate 1 and load cover plate 10, both are by nut 11 space distance control on the upside of nut 9, load cover plate on the downside of the load screw rod 2 at four angles and load cover plate, and wherein backing plate 1 length, width and height are of a size of 200mm × 200mm × 10mm; Load cover plate 10 is of a size of 200mm × 200mm × 10mm.
Between backing plate 1 and load cover plate 10, place lifting jack 4 successively from bottom to up, pressure transducer 3, planting reinforced bar into concrete test specimen 5, dowel 7, spring 6, spring backing plate 8, pressure transducer 3 Bonding pressure sensor reading instrument 13, one end of dowel 7 is placed in the top of planting reinforced bar into concrete test specimen 5 and does not contact the anchoring adhesive overflowed in bar planting hole, the other end stretches out the preset hole of load cover plate 10, be convenient to apply anchoring nut 12 at dowel 7 top, reach meets anchoring, load requirement, spring 6 to be placed on dowel 7 and to be stuck between planting reinforced bar into concrete test specimen 5 and spring backing plate 8, in order to ensure stability during load application, lifting jack 4, planting reinforced bar into concrete test specimen 5, dowel 7 requires coaxial setting, and the center superposition of trying one's best with backing plate 1 and load cover plate 10.Spring backing plate 8 size 100mm × 100mm × 10mm.
Described spring backing plate 8 center drilling, aperture is less than spring 6 internal diameter, and slightly larger than the external diameter of dowel 7, can make that dowel 7 is just contactless to be passed.Load cover plate 10 center drilling, aperture is less than spring backing plate 8 length of side and much larger than anchoring nut 12 size, and the dismounting of load cover plate 10 after being convenient to load application.Spring inside diameter should not be less than 20mm, avoids directly contacting with the anchoring adhesive of the spilling around bar planting hole, causes discontinuity.
Backing plate 1, load cover plate 10, spring backing plate 8 should adopt steel matter, avoids damaging in pressure process.Load screw rod 2 is symmetrically distributed in distance backing plate 1 four jiaos of 20mm places, ensures in pressure process unanimously stressed.Two slidingtype bolt 2 spacing are greater than the diameter of planting reinforced bar into concrete test specimen 5, conveniently test assembling.
Process is applied to the load of test specimen as follows:
(1) first load screw rod and backing plate are fixed, on load screw rod, then install the downside nut 9 of load cover plate, height of nut meets the space requirement that test specimen is installed; Load cover plate is installed, four load screw rod bolts 2 at load cover plate 10 4 angles place applies nut 11 on the upside of load cover plate, tightens, the spacing of fixing load cover plate 10 and backing plate 1;
(2) between load cover plate and backing plate, from the bottom to top, coaxial setting pressure sensor, lifting jack, planting reinforced bar into concrete test specimen, spring, spring backing plate successively; Planting reinforced bar into concrete test specimen is inserted in dowel one end, and free end is provided with screw thread and stretches out spring backing plate 1mm, and now anchoring nut is not installed temporarily.
(3) lifting jack 4 cylinder body stretches out pressurization, and spring 6 pressurized shortens, lifting jack 4 persistent pressure, until pressure sensor readings instrument 13 reading reaches preset pressure, stop pressurization, apply anchoring nut 12 at screw thread place, dowel 7 top, being screwed to pressure transducer reading is 0, fixing spring backing plate 8;
(4) nut 11 on the upside of four the load cover plates unclamping load cover plate 10 top, dismounting load cover plate 10, because anchoring nut 12 is applied on the screw thread of dowel 7 top, spring backing plate 8 moves on cannot continuing again, and spring is in and produces acting force by contracting state.Fix to the distance of planting reinforced bar into concrete test specimen 5 upper surface bottom anchoring nut 12, this distance is the height sum of spring 6 and spring backing plate 8.From top to bottom, anchoring nut 12, spring backing plate 8, spring 6 by compressing, planting reinforced bar into concrete test specimen 5, bar planting are in planting reinforced bar into concrete test specimen 5 and dowel 7 transmitting forces run through with upper-part, form an one-piece construction, take out this entirety, as Fig. 5, so far the pressure process to planting reinforced bar into concrete test specimen 5 continuing load is completed, in this entirety, because spring is in pressured state, there is provided continuous to test specimen, the dowel length in planting reinforced bar into concrete test specimen is made up of the bar planting degree of depth, its length and spring pad plate thickness three part.It is simple that pressure of the present invention applies process, and can be test specimen in enormous quantities and carry out applying to continue onesize load.
Claims (5)
1. chemistry of concrete bar planting continuing load bringing device, is characterized in that comprising backing plate and load cover plate, and both pass through load screw rod and the nut space distance control at four angles;
Between backing plate and load cover plate, placement force sensor, lifting jack, planting reinforced bar into concrete test specimen, spring, spring backing plate successively from bottom to up, planting reinforced bar into concrete test specimen is inserted in dowel one end, and free end is provided with screw thread and stretches out load cover plate; Spring is placed on dowel, is stuck between planting reinforced bar into concrete test specimen and spring backing plate; Backing plate, load cover plate, lifting jack, dowel, spring require coaxial setting;
Described spring backing plate center drilling, aperture is less than spring inside diameter, and is greater than the external diameter of bolt type dowel;
The perforate of described load cover plate central, aperture should be less than spring pad board size and be greater than anchoring nut size.
2. chemistry of concrete bar planting continuing load bringing device according to claim 1, is characterized in that spring inside diameter is not less than 30mm.
3. chemistry of concrete bar planting continuing load bringing device according to claim 1, is characterized in that described backing plate, load cover plate, and spring backing plate adopts steel matter.
4. chemistry of concrete bar planting continuing load bringing device according to claim 1, is characterized in that load screw rod clear spacing is greater than concrete sample size.
5., based on the chemistry of concrete bar planting continuing load applying method of chemistry of concrete bar planting continuing load bringing device according to claim 1, it is characterized in that step is as follows:
(1) first load screw rod and backing plate are fixed, on load screw rod, then install the downside nut of load cover plate, height of nut meets the space requirement that test specimen is installed; Load cover plate is installed, then the upside nut of load cover plate is installed, after nut screwing clamping, the spacing of fixing slide cover and backing plate;
(2) between load cover plate and backing plate, from the bottom to top, coaxial setting pressure sensor, lifting jack, planting reinforced bar into concrete test specimen, spring, spring backing plate successively; Dowel free end micro stretching goes out spring backing plate, and now anchoring nut is not installed temporarily;
(3) lifting jack cylinder body stretches out pressurization, and test specimen moves, until spring shim is supported on load cover plate, now spring starts pressurized, and its length shortens, lifting jack persistent pressure, until pressure sensor readings reaches preset pressure, stops pressurization;
(4) install anchoring nut at dowel free end screw thread place, being screwed to pressure transducer reading is 0; Now, spring is to the reversed load that dowel provides the payload values that lifting jack applies;
(5) lifting jack cylinder body retraction, the overall test specimen that test specimen, the spring by compressing, spring backing plate, dowel, anchoring nut form being taken out, completing the applying to test specimen continuing load, in this overall test specimen, because spring is in pressured state, provide lasting pulling force to dowel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510891679.2A CN105510132B (en) | 2015-12-07 | 2015-12-07 | Chemistry of concrete bar planting continuing load bringing device and its applying method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510891679.2A CN105510132B (en) | 2015-12-07 | 2015-12-07 | Chemistry of concrete bar planting continuing load bringing device and its applying method |
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| Publication Number | Publication Date |
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| CN105510132A true CN105510132A (en) | 2016-04-20 |
| CN105510132B CN105510132B (en) | 2019-03-29 |
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| CN201510891679.2A Expired - Fee Related CN105510132B (en) | 2015-12-07 | 2015-12-07 | Chemistry of concrete bar planting continuing load bringing device and its applying method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107807039A (en) * | 2017-11-28 | 2018-03-16 | 湖南大学 | Lever long duration load tests loading frame |
| CN109540669A (en) * | 2018-12-03 | 2019-03-29 | 北京工业大学 | A kind of FRP tendons continue compression lock test device |
| CN110702509A (en) * | 2019-09-23 | 2020-01-17 | 重庆大学 | Cement-based material continuous loading device for durability test |
| CN114958396A (en) * | 2022-05-29 | 2022-08-30 | 五冶集团上海有限公司 | Coke oven brace spring pressurizing method |
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| CN201689016U (en) * | 2010-04-12 | 2010-12-29 | 青岛理工大学 | Concrete constant tensile holding and composite corrosion test device |
| CN102564916A (en) * | 2012-01-16 | 2012-07-11 | 河海大学 | Fast load testing device and method for chloride ion migration coefficient of concrete |
| CN102998174A (en) * | 2011-09-09 | 2013-03-27 | 中交四航工程研究院有限公司 | Long-term loading apparatus system for concrete sample durability tests |
| CN203191293U (en) * | 2013-04-23 | 2013-09-11 | 金陵科技学院 | Bonding performance test device for FRP (Fiber Reinforced Plastic) rib and concrete under complex stress state |
| CN204536179U (en) * | 2015-05-07 | 2015-08-05 | 济南臻固土木工程有限公司 | Thermal-mechanical Coupling experiment all-in-one |
| CN105181588A (en) * | 2015-10-21 | 2015-12-23 | 江苏城市职业学院 | Device for determining adhesive property of steel bars and concrete in extruding manner and testing method of device |
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2015
- 2015-12-07 CN CN201510891679.2A patent/CN105510132B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201689016U (en) * | 2010-04-12 | 2010-12-29 | 青岛理工大学 | Concrete constant tensile holding and composite corrosion test device |
| CN102998174A (en) * | 2011-09-09 | 2013-03-27 | 中交四航工程研究院有限公司 | Long-term loading apparatus system for concrete sample durability tests |
| CN102564916A (en) * | 2012-01-16 | 2012-07-11 | 河海大学 | Fast load testing device and method for chloride ion migration coefficient of concrete |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107807039A (en) * | 2017-11-28 | 2018-03-16 | 湖南大学 | Lever long duration load tests loading frame |
| CN109540669A (en) * | 2018-12-03 | 2019-03-29 | 北京工业大学 | A kind of FRP tendons continue compression lock test device |
| CN109540669B (en) * | 2018-12-03 | 2021-08-17 | 北京工业大学 | FRP muscle lasts compressive stress locking test device |
| 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 |
| CN114958396A (en) * | 2022-05-29 | 2022-08-30 | 五冶集团上海有限公司 | Coke oven brace spring pressurizing method |
| CN114958396B (en) * | 2022-05-29 | 2024-04-05 | 五冶集团上海有限公司 | Coke oven brace spring pressurization method |
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| CN105510132B (en) | 2019-03-29 |
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Granted publication date: 20190329 Termination date: 20211207 |