CN101532918A - Calibration system of core-through type prestressed tensioning hoisting jack - Google Patents
Calibration system of core-through type prestressed tensioning hoisting jack Download PDFInfo
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- CN101532918A CN101532918A CN200910068632A CN200910068632A CN101532918A CN 101532918 A CN101532918 A CN 101532918A CN 200910068632 A CN200910068632 A CN 200910068632A CN 200910068632 A CN200910068632 A CN 200910068632A CN 101532918 A CN101532918 A CN 101532918A
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Abstract
The invention discloses a calibration system of core-through type prestressed tensioning hoisting jacks. The system comprises a stress sensor and a reaction device, wherein the stress sensor is a core-through type sensor; at least one prestressed tendon is at the position of the central pore canal of calibrated core-through hoisting jack; the core-through sensor is sleeved on the prestressed tendon, and is tightly contacted with one end of the core-through type hoisting jack; the outer ends of both the core-through type sensor and the core-through type hoisting jack are provided with clamps with self-locking anchors sleeved on the prestressed tendon; and the reaction device is composed of the prestressed tendon and the self-locking anchors. The invention can completely simulate the tension operating condition of prestressed concrete structure member, can detect the corresponding value of oil pressure gauge under certain tensioning force, and further can eliminate the interference of stranded steel wire or anchor clamp and the like in tension working process to a great extent, thereby being capable of improving calibration precision.
Description
Technical field
The present invention relates to a kind of calibration system of prestressed stretch-draw lifting jack, particularly a kind of calibration system of core-through type prestressed tensioning hoisting lifting jack.
Background technology
Prestressed reinforced concrete construction is that high tensile reinforcement and high-strength concrete combine and a kind of new version that forms, utilize this version can give full play to the performance of high tensile reinforcement and high-strength concrete, and can set up the stress or the deformation state of expection according to structural engineer's requirement, to resist the effect of external load, adopt this version both economical with materials, the energy, structural behaviour be can improve again, thereby the crack and the problem on deformation of reinforced concrete structure solved.Thereby prestressed concrete is widely used in all kinds of special engineering structures such as building, bridge, municipal infrastructure, hydraulic engineering in civil engineering field.
Prestressed structure construction is that strongly professional, with high content of technology a, operation requires tight operation.Especially the stretch-draw anchor of presstressed reinforcing steel is highly professional, and quality requirements is higher.The stretch-draw of presstressed reinforcing steel is the important procedure in the pre-stress construction, and its tensioning equipment is made up of hydraulic tensioning lifting jack, electric oil pump and external oil pipe, tensimeter etc.The stretch-draw machine is mainly used in the production of prestressed reinforced concrete member, by the stretch-draw machine reinforcing bar is applied predetermined pulling force, makes its prestress reach designing requirement.In prestressed concrete member was produced, tensioning equipment was measured by tensimeter the acting force that reinforcing bar applies.Reading on the tensimeter is the oil pressure in the jack cylinder, it can be multiply by the piston area of lifting jack in theory, tries to achieve the size of acting force.But the power that in fact acts on the reinforcing bar is less than theoretical value, because of a part of acting force is consumed by the friction force of jack cylinder and piston space, the size of friction force is then relevant with the machining precision of the degree of wear, oil cylinder and the piston of oil pressure height, O-ring seal etc., and concrete being difficult to measured.And whether the stretching force value of tensioning equipment reaches designing requirement, is directly connected to the safe handling of pre-stressed structural member.Therefore, for guaranteeing construction quality, guarantee the accuracy of stretching force value, tensioning equipment should be calibrated the supporting numbering of electric oil pump, tensimeter of lifting jack and use thereof before use, actual force during with mensuration stretch-draw and the relation between the tensimeter are used during for stretch-draw.
In the pre-stress construction, what at first will do is exactly the verification work of stretch-draw lifting jack.6.1.2 bar regulation among State Standard of the People's Republic of China's " concrete structure engineering construction quality acceptance specification " GB 50204-2002: tension of prestressed tendon plant and instrument, answer periodic maintenance and verification.Tensioning equipment is answered supporting demarcation, and supporting use.The demarcation time limit of tensioning equipment should not surpass half a year.When in use abnormal phenomena occurring or after the lifting jack maintenance, should demarcate again.Not only national regulation has regulation, in a lot of special standards and guide, the demarcation of stretch-draw lifting jack is had strict more regulation.Such as requiring in the support cast-in-place box girder construction job instruction of abideing by " passenger dedicated railway line construction of bridge and culvert inspection of quality tentative standard ", " passenger dedicated railway line construction of bridge and culvert technical manual " establishment: lifting jack is demarcated the term of validity can not be above one month.In addition, in viaduct construction construction be: must proofread and correct the oil meter recast during following situation: use above three months to the common requirement of the demarcation of prestress tensioning equipment; Stretch-draw 300 bundle presstressed reinforcing steels; In use find above after the permissible error or the maintenance of breaking down; Transportation, deposit with use in prevent Exposure to Sunlight, make moist and shake, otherwise must proofread and correct.
In the technology, the calibration steps of prestress tensioning equipment has two kinds now, and a kind of is to calibrate the stretch-draw machine with testing machine, and another kind is to calibrate stretch-draw machine hydropress with standard dynamometer tensioning equipment is carried out verification.Wherein, utilizing testing machine to demarcate lifting jack is to make hydropress circle reading and oil pressure gauge reading set up one-to-one relationship, using the dynamometry frame to demarcate lifting jack is to make the electronic instrument of standard dynamometer and oil pressure gauge reading set up one-to-one relationship, all can draw stretching force and the oil pressure gauge reading mathematical relation between the two with above-mentioned two kinds of methods, thereby reach the purpose of verification tensioning equipment, the difference of above-mentioned two kinds of methods is on counterforce device and the dynamometry instrument.
No matter be to use testing machine also to be to use standard dynamometer to demarcate, at first connect the oil circuit and the circuit of tensioning equipment, lifting jack is vertically stood on pressing machine central authorities, start oil pump then, make that jack piston is pulled out, backhaul several times, discharge the air in oil circuit and the lifting jack, note observing the whether leakage of oil of oil pipe and junction, should in time change oil pipe or cushioning is handled if any oil leakage phenomenon.
The operating process of selecting for use testing machine to demarcate, as Figure 1-1, the starting pressure machine, rampiston 6 is risen, fall pressing machine top board 5, top board 5 is pressed on the lifting jack 1, certainly be placed with backing plate 4 and 2 respectively at the two ends, upper end of standard dynamometer, turn off pressing machine delivery valve (the oil meter reading of stretch-draw this moment oil pump and the circle reading of pressing machine should be zero) then, start the stretch-draw oil pump, open the pressurization of oil pump feed valve.The roof pressure masterpiece of lifting jack 1 is used for pressing machine, and pressing machine reacts on lifting jack 1, and the oil meter number of the scale numerical value of pressing machine and the stretch-draw oil pump rising of starting from scratch like this is along with two numerical value of lasting fuel feeding of stretch-draw oil pump also increase in succession.In the oil pressure propagation process, the numerical value that the every interval of pressing machine scale is certain, the reading to stretch-draw oil meter and pressing machine carries out record simultaneously, so just can obtain two groups of numbers one to one, presses the different stroke verifications three times of lifting jack, and data are recorded in the form.Because the requirement of testing machine itself, timing signal allows the working piston of lifting jack tell the top in contact pressure machine pressing plate state bottom not earlier, and lifting jack stops initiatively work then, starts pressing machine again, clamp down on the jack piston surface and increase pressure, until predetermined maximum pressure value with compression piston.Carry out in the calibration process at above-mentioned service-test machine, though can calculate the pairing manometric reading of stretching force value at any time, but error is bigger, it produces reasons of error and is: the lifting jack that should initiatively work but is in passive duty, the traffic direction of timing signal jack piston be with actual stretch-draw duty be inconsistent, cause unavoidably because of mill resistance in the lifting jack, oil pipe transmission loss and oil pump, tensimeter output relation difference and bring some errors.In addition, the timing signal lifting jack is vertical placement, rather than common horizontal during site work, and this has also brought error.Same lifting jack is when the different operating state, and piston is different with the friction force direction of oil cylinder inner wall, and be identical two kinds of different duty downforce with the same supporting use of tensimeter, and externally actual force is inequality.In addition, adopt in the above-mentioned scaling method, because the immovability of pressing machine, unit in charge of construction need use lorry a complete set of equipment such as the oil pump of the lifting jack of hundreds of kilogram weight and kilogram weights up to a hundred and oil pipe to be moved to the check unit that is positioned at the urban district of lorry restricted driving on daytime, retract again after the demarcation all through the night, cause manpower and burden economically to unit in charge of construction, simultaneously, also caused no small waste in time.
The operating process that the selection standard dynamometer is demarcated, shown in Fig. 1-2, lifting jack 1 is put into calibration stretch-draw machine special framework 5, on lifting jack 1, put standard dynamometer 3, two ends up and down at standard dynamometer prevent pad 4 or 2, and installation should make the geometric center lines of lifting jack 1 and the main axis of standard dynamometer 3 coincide.Lifting jack 1 and standard dynamometer 3 installed be adjusted to duty after, start oil pump, apply preload twice with 1 pair of standard dynamometer 3 of lifting jack, return to initial trial power after being added to required specified test power at every turn, then from initial trial power, apply test power by incremental order, up to specified test power.Put out stretch-draw machine stretch-draw overhead control power relative pressure in order with least square method at last and represent the straight-line equation that is worth.Also can be according to design and construction process requirement, calculating needs the stretching force value used in the construction, try to achieve corresponding manometric reading by required stretching force value then.Though, may inconsistent problem when selecting for use above-mentioned standard dynamometer to demarcate can to solve lifting jack to be subjected to force direction and actual stretch-draw work, and compare the measuring accuracy height of traditional testing machine, its measuring accuracy can reach 2%.Therefore, demarcation mode of praising highly very much the electronics dynamometer in the field of business, present above-mentioned dynamometer has been subjected to promoting the use of widely, but dynamometer is to realize counter-force by the steel pull bar, systems bulky is used inconvenience.And, adopt this force measuring machine to demarcate still the actual state at construction simulation scene fully, influence factor in the time of can't embodying the actual pre-stress construction of each building site and steel strand wires, ground tackle, temperature and construction gimmick etc. inequality, this shows, except convenience, on accuracy and real directiveness, use the above-mentioned force measuring machine that constitutes by dynamometry frame and dynamometer to demarcate frame and still exist deficiency.
Summary of the invention
At above-mentioned prior art, the invention provides a kind of calibration system of core-through type prestressed tensioning hoisting lifting jack, calibration system of the present invention uses light simple, and the stretch-draw duty of construction simulation state lower prestress concrete structure member fully, can detect the response of oil pressure gauge under certain stretching force, the interference of steel strand wires and intermediate plate etc. makes the demarcation occasion have more authenticity in the time of can also eliminating stretch-draw work fully; Use calibration system of the present invention to demarcate, make calibration value more accurate, be convenient to the technical operation of the actual examination of management personnel unit in charge of construction prestressed stretch-draw, material, equipment, personnel's level and the construction method etc. of relevant prestressed structure construction are influenced each key element of construction quality, better guidance, examination and role of inspection are arranged; Use the present invention demarcates, steel strand wires and anchor clamp that the scene of can adopting provides, like this in calibration process, the engineering problem that has reflected each engineering to use the material of different quality to greatest extent and caused, get rid of hidden danger, satisfy Structural Design Requirement, provide better guarantee for guaranteeing construction quality, the present invention provides convenient to greatest extent can for owner, design, construction, supervision, management etc.
In order to solve the problems of the technologies described above, the technical scheme that the present invention is achieved is: use core-theaded type transducer calibration core-through type prestressed tensioning hoisting lifting jack, be provided with at least one presstressed reinforcing steel by in the core-theaded type lifting jack central duct of demarcating; Described core-theaded type sensor sleeve is contained on the above-mentioned presstressed reinforcing steel, and closely contacts with an end of above-mentioned core-theaded type lifting jack; The outer end of described core-theaded type sensor and core-theaded type lifting jack is provided with the self-locking anchor clamp that is sleeved on the presstressed reinforcing steel; Described counterforce device is made of above-mentioned presstressed reinforcing steel and self-locking anchor clamp.
The calibration system of core-through type prestressed tensioning hoisting lifting jack of the present invention, wherein, described presstressed reinforcing steel comprises high strength low relaxed steel strand wires, heat-treated steel bar, high tensile steel wire or carbon fiber rod.Described self-locking anchor clamp is made of presstressed reinforcing steel anchor slab and intermediate plate, is provided with backing plate between described core-theaded type sensor and the anchor slab.Be provided with backing plate between described core-theaded type lifting jack and the described core-theaded type sensor.
Compared with prior art, the invention has the beneficial effects as follows:
The calibration system of core-through type prestressed tensioning hoisting lifting jack of the present invention can be simulated the stretch-draw duty of prestressed reinforced concrete construction member fully, not only can detect the respective value of oil pressure gauge under certain stretching force, can also eliminate the interference of steel strand wires or anchor clamp etc. in the stretch-draw course of work to a large extent, thereby can improve the degree of accuracy of demarcation, and provide convenient to greatest extent for owner, design, construction, supervision, supervisor etc.During use, on-the-spot steel strand wires and the anchor clamp that provides is provided, like this in calibration process, the engineering problem that has reflected each engineering to use the material of different quality to greatest extent and caused, get rid of the unsettled hidden danger of quality, for satisfying Structural Design Requirement, guaranteeing that construction quality provides better guarantee.
Description of drawings
Fig. 1-the 1st, the synoptic diagram that service-test machine is demarcated in the prior art;
Fig. 1-2 is the synoptic diagram that uses the dynamometry frame to demarcate in the prior art;
Fig. 2-the 1st, the structural representation of calibration system one embodiment of core-through type prestressed tensioning hoisting lifting jack of the present invention;
Fig. 2-the 2nd, the structural representation of another embodiment of calibration system of core-through type prestressed tensioning hoisting lifting jack of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments the present invention is done to describe in further detail.
Main parts size of the present invention and specification specified: 100. computing machines, 200. strainometers, 300. steel strand wires (steel wire bundle), 400. core-theaded type lifting jack, 500. backing plates, 600. core-theaded type sensors, 700. anchor slabs.
Shown in Fig. 2-1 and Fig. 2-2, the calibration system of core-through type prestressed tensioning hoisting lifting jack of the present invention, this system stress sensor and counterforce device constitute, and described strain gauge is made of computing machine 100, strainmeter 200 and core-theaded type sensor 600; By the stress rib that is provided with in the central duct of the core-theaded type lifting jack demarcated, described presstressed reinforcing steel can be selected high strength low relaxed steel strand wires, heat-treated steel bar, high tensile steel wire or carbon fiber rod for use.For example: presstressed reinforcing steel wherein adopts steel wire bundle just to constitute the demarcation mode of the demarcation group anchor lifting jack shown in Fig. 2-2 if adopt steel strand wires just to constitute the demarcation mode of the single anchor lifting jack of demarcation shown in Fig. 2-1.Described core-theaded type sensor 600 is to be sleeved on the above-mentioned presstressed reinforcing steel, and closely contacts with an end of above-mentioned core-theaded type lifting jack 400; The outer end that is positioned at described core-theaded type sensor 600 and core-theaded type lifting jack 400 is provided with and is sleeved on having from the lockset anchor clamp on the presstressed reinforcing steel, and described self-locking anchor clamp is made of presstressed reinforcing steel anchor slab 700 and intermediate plate.Inventive point of the present invention is exactly the counterforce device that has adopted a kind of new structure in the calibration system of core-through type prestressed tensioning hoisting lifting jack, and this counterforce device mainly is to be made of above-mentioned presstressed reinforcing steel and self-locking anchor clamp.
Usually, one end of described core-theaded type sensor 600 directly contacts with an end of described core-theaded type lifting jack 400, but big or small matching relationship according to this sensor end face and lifting jack surface of contact area, between described core-theaded type lifting jack 400 and described core-theaded type sensor 600, backing plate 500 can also be set selectively, to adapt to the lifting jack of different big ting models.In like manner, according to the area matched relation between the anchor slab 700 of described core-theaded type sensor 600 and contact with it, between also can selectively be provided with backing plate 500.
What demarcated in the calibration system of core-through type prestressed tensioning hoisting lifting jack of the present invention is the core-theaded type lifting jack, is mainly used in single steel bar or steel hinge line that stretch-draw has anchor clamp, heat-treated steel bar or steel wire bundle, carbon fiber rod etc.
An embodiment of the calibration system of core-through type prestressed tensioning hoisting lifting jack of the present invention is: construction equipment and material composition counterforce devices such as the high strength low relaxed steel strand wires at application strain gauge coordinative construction scene, self-locking anchor clamp, form the demarcation means of light easy-to-use core-through type prestressed tensioning hoisting lifting jack, this system can be widely used in tensioning construction with in the calibration operation of jack device.
Worker's process of utilizing the calibration system of core-through type prestressed tensioning hoisting lifting jack of the present invention that group's anchor core-theaded type lifting jack is demarcated is:
Shown in Fig. 2-2, at first high strength low relaxed steel wire bundle 300 is passed core-theaded type lifting jack 400 and core-theaded type sensor 600, and it is with anchor clamp that above-mentioned high strength low relaxed steel wire bundle 300 is fixing with auto-lock function at the two ends of core-theaded type sensor 600 and core-theaded type lifting jack 400, thereby formation self-locking, consider the area matched relation between the anchor slab 700 of the big ting model of core-theaded type lifting jack 400 and core-theaded type sensor 600 and contact with it, can selectively backing plate 500 be set at core-theaded type sensor 600 two ends.Secondly, the strainometer 200 that connects computing machine 100 is linked to each other with core-theaded type sensor 600, then can open fuel tap, start 400 pairs of steel wire bundles 300 of core-theaded type lifting jack and apply pre-tensile stress, because the effect of two ends anchor slab 700, steel wire bundle 300 two ends are by locked, steel wire bundle 300 together deforms with core-theaded type sensor 600, deflection is shown in the screen of computing machine 100 by strainometer 200, the prestress that this process can will put on the steel wire bundle 300 is mapped one by one with the oil pressure of being marked core-theaded type lifting jack 400, and the formation data relationship, thereby reach the purpose of demarcation.
The calibration process of the course of work of the demarcation of the single anchor core-theaded type lifting jack shown in Fig. 2-1 and above-mentioned group's anchor core-theaded type lifting jack is similar, does not do at this and gives unnecessary details.
Specific embodiment:
Below the calibration system that core-through type prestressed tensioning hoisting lifting jack of the present invention is described in the tabulation mode to specification be 2500kN demarcated resulting relevant data by mark core-theaded type lifting jack, see Table 1, table 2 and table 3.
Table 1 nominal data
Table 2 error analysis contrast
Table 3 data computation
In sum, utilizing calibration system of the present invention to demarcate near simulated field construction concrete condition, is a kind of scaling method of the lightest easy-to-use core-through type prestressed tensioning hoisting lifting jack.
After utilizing calibration system of the present invention to carry out a large amount of tests, the major technique, economic target and the range of application that draw calibration system of the present invention are:
1. consistent with the duty of lifting jack in the practice of construction in demarcating operation;
2. can demarcate the tensioning equipment of two cover same specifications simultaneously, increase work efficiency;
3. can be provided to the service of demarcating to the doorstep of construction operation face for the working-yard, better service is saved construction cost in construction enterprises.
4. measuring accuracy (is seeing Table 2) more than 0.5%, improves stated accuracy more than one times than scaling method of the prior art.
Although top invention has been described in conjunction with figure; but the present invention is not limited to above-mentioned embodiment; above-mentioned embodiment only is schematic; rather than it is restrictive; those of ordinary skill in the art is under enlightenment of the present invention; under the situation that does not break away from aim of the present invention, can also make a lot of distortion, these all belong within the protection of the present invention.
Claims (4)
1. the calibration system of a core-through type prestressed tensioning hoisting lifting jack comprises strain gauge and counterforce device, it is characterized in that:
Described strain gauge is the core-theaded type sensor;
By at least one presstressed reinforcing steel that be provided with in the central duct of the core-theaded type lifting jack demarcated;
Described core-theaded type sensor sleeve is contained on the above-mentioned presstressed reinforcing steel, and closely contacts with an end of above-mentioned core-theaded type lifting jack;
The outer end of described core-theaded type sensor and core-theaded type lifting jack is provided with to be sleeved on has a self-locking anchor clamp on the presstressed reinforcing steel;
Described counterforce device is made of above-mentioned presstressed reinforcing steel and self-locking anchor clamp.
2. the calibration system of core-through type prestressed tensioning hoisting lifting jack according to claim 1 is characterized in that: described presstressed reinforcing steel comprises high strength low relaxed steel strand wires, heat-treated steel bar, high tensile steel wire or carbon fiber rod.
3. the calibration system of core-through type prestressed tensioning hoisting lifting jack according to claim 1 is characterized in that: described self-locking anchor clamp is made of presstressed reinforcing steel anchor slab and intermediate plate, is provided with backing plate between described core-theaded type sensor and the anchor slab.
4. the calibration system of core-through type prestressed tensioning hoisting lifting jack according to claim 1 is characterized in that: be provided with backing plate between described core-theaded type lifting jack and the described core-theaded type sensor.
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| CN2009100686320A CN101532918B (en) | 2009-04-27 | 2009-04-27 | Calibration system of core-through type prestressed tensioning hoisting jack |
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| CN2009100686320A CN101532918B (en) | 2009-04-27 | 2009-04-27 | Calibration system of core-through type prestressed tensioning hoisting jack |
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Cited By (8)
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| CN104949849A (en) * | 2015-04-27 | 2015-09-30 | 同济大学 | Jack demarcating and calibrating methods |
| CN107542272A (en) * | 2017-09-25 | 2018-01-05 | 沈阳工业大学 | Novel portable prestressed draw-bar tensioning equipment |
| CN107830973A (en) * | 2017-09-28 | 2018-03-23 | 中国核工业华兴建设有限公司 | A kind of jack calibration device and scaling method |
| CN108195709A (en) * | 2017-12-25 | 2018-06-22 | 中铁六局集团有限公司 | A kind of static load anchoring test machine method of calibration |
| CN109343591A (en) * | 2018-09-15 | 2019-02-15 | 北京市建筑工程研究院有限责任公司 | Post-tensioned prestressing tensioning Precise control device and method based on intelligent steel strand |
| CN109374168A (en) * | 2018-09-17 | 2019-02-22 | 武汉希萌科技有限公司 | A method of accurately using load cell in tensioning construction |
| CN111189657A (en) * | 2020-01-13 | 2020-05-22 | 安徽工业大学 | Method for correcting hydraulic jack by using axial compression steel pipe |
| CN117723379A (en) * | 2024-02-07 | 2024-03-19 | 中筋(辽宁)建设工程有限公司 | Steel strand prestress detection device and detection method for bridge construction |
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| CN2597610Y (en) * | 2003-01-28 | 2004-01-07 | 山东建筑工程学院 | Towing equipment for translation of whole building |
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| CN104949849A (en) * | 2015-04-27 | 2015-09-30 | 同济大学 | Jack demarcating and calibrating methods |
| CN107542272A (en) * | 2017-09-25 | 2018-01-05 | 沈阳工业大学 | Novel portable prestressed draw-bar tensioning equipment |
| CN107542272B (en) * | 2017-09-25 | 2023-09-22 | 沈阳工业大学 | Novel portable prestressed pull rod tensioning device |
| CN107830973A (en) * | 2017-09-28 | 2018-03-23 | 中国核工业华兴建设有限公司 | A kind of jack calibration device and scaling method |
| CN108195709A (en) * | 2017-12-25 | 2018-06-22 | 中铁六局集团有限公司 | A kind of static load anchoring test machine method of calibration |
| CN109343591A (en) * | 2018-09-15 | 2019-02-15 | 北京市建筑工程研究院有限责任公司 | Post-tensioned prestressing tensioning Precise control device and method based on intelligent steel strand |
| CN109374168A (en) * | 2018-09-17 | 2019-02-22 | 武汉希萌科技有限公司 | A method of accurately using load cell in tensioning construction |
| CN111189657A (en) * | 2020-01-13 | 2020-05-22 | 安徽工业大学 | Method for correcting hydraulic jack by using axial compression steel pipe |
| CN111189657B (en) * | 2020-01-13 | 2021-06-15 | 安徽工业大学 | Method for correcting hydraulic jack by using axial compression steel pipe |
| CN117723379A (en) * | 2024-02-07 | 2024-03-19 | 中筋(辽宁)建设工程有限公司 | Steel strand prestress detection device and detection method for bridge construction |
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