CN102941623A - Control method for tension parameters of box girder prestress tension system - Google Patents
Control method for tension parameters of box girder prestress tension system Download PDFInfo
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- CN102941623A CN102941623A CN201210465547XA CN201210465547A CN102941623A CN 102941623 A CN102941623 A CN 102941623A CN 201210465547X A CN201210465547X A CN 201210465547XA CN 201210465547 A CN201210465547 A CN 201210465547A CN 102941623 A CN102941623 A CN 102941623A
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Abstract
The invention relates to a control method for tension parameters of a box girder prestress tension system. The control method for tension parameters of a box girder prestress tension system comprises a controller, a pressure sensor, an oil pump truck, an oil pressure center-hole type jack and a displacement sensor, wherein the controller, the pressure sensor, the oil pump truck, the oil pressure center-hole type jack and the displacement sensor are arranged at both ends of a reinforcing bar to be tensioned. The control method for tension parameters of a box girder prestress tension system is characterized by also comprising a main controller, wherein the main controller not only can control the tension speed and the applied tension force, but also can display the tension curve of the tensioned reinforcing bar, i.e. tension amount-tension force curve, tension time-tension amount curve, and tension time-tension force curve. During normal tensioning, the tension amount-tension force curves at the two ends of the tensioned reinforcing bar are basically coincided. When the friction force and drag of the tensioned reinforcing bar are abnormal, the tension time-tension amount curve generates inflexion point or the reinforcing bar is broken. When the inflexion point is generated, the tension speed or the tension force is reduced. When the reinforcing bar is broken, the broken reinforcing bar is replaced by a new reinforcing bar, and the tension operation is carried out again. The control method provides a good tension technology control method for operators on site.
Description
Technical field
The present invention relates to the box girder pre-stressed tension control system in a kind of Geotechnical Engineering field, particularly disclose a kind of control method of box girder pre-stressed tensioning system stretch-draw parameter.
Background technology
In overpass, bridge construction, need to use prestress box beam as the road basis.The post stretching of using are made In Reinforced Concrete Box Girder more at present.Namely after completing, the case beam carries out again prestressed, reinforced stretch-draw operation.
Stretching process is as follows: use two cover oil pressure punching jack to be set on by on the tendon of stretch-draw, be fixed on case beam two ends, on two cover oil pressure punching jack a displacement transducer is installed separately, be used for measuring in real time the displacement when stretching; Be separately installed with pressure sensor at two hydrant carts, can obtain two ends stretching force value by converting.Two hydrant carts are respectively by the front controller controlling run, and two front controllers are operated by master controller.
Master controller sends two front controllers difference of stretched operation instruction process oil pump truck to two cover oil pressure punching jack oilings pressurizations, so that reinforcing bar is by synchro-draw.In the process that stretches, master controller reads the tendon amount of tension data that two displacement transducers are passed back in real time, also reads in real time the stretching force value at two ends simultaneously.
According to working specification, in stretching process, the amount of tension at two ends should keep synchronously, and it is consistent that the size of stretching force is also wanted.The purpose of doing like this is stressed inconsistent in order to prevent case beam two ends, causes cement to produce the service life that be full of cracks affects the case beam.
Because have inhomogeneous frictional resistance in the case beam steel pipeline, in the time of may causing applying identical stretching force, amount of tension is inconsistent.If fracture of wire appears in reinforcing bar in drawing process, also can cause amount of tension inconsistent.These phenomenons all can be so that the prestress box beam Quality Down.Need operating personnel's Real-Time Monitoring in stretching process, in order to when above-mentioned state occurring, in time adjust.
Automatic control tensioning system does not in the past show amount of tension and the stretching force in the stretching process, and operating personnel also can't judge whether to occur the excessive or fracture of wire phenomenon of frictional resistance.So that box girder pre-stressed stretch-draw difficult quality control.
Summary of the invention
The objective of the invention is to address the deficiencies of the prior art; design a kind of control method of box girder pre-stressed tensioning system stretch-draw parameter; adopt main control in the tendon drawing process, two ends stretching force and amount of tension to be shown in real time, help operating personnel to judge and whether occur the two ends frictional resistance in the tendon drawing process unusually or the fracture of wire phenomenon.
The present invention is achieved in that a kind of control method of box girder pre-stressed tensioning system stretch-draw parameter, comprise the controller, pressure sensor, hydrant cart, oil pressure punching jack and the displacement transducer that are installed in reinforcing bar to be tensioned two ends, it is characterized in that: also comprise master controller, described master controller is not only controlled tensioning speed and apply stretching force,---stretching force curve, stretch-draw time---amount of tension curve, stretch-draw time---the stretching force curve that also shows simultaneously the stretch-draw curve of tension reinforcing steel bar: amount of tension.
A rectangular coordinate system is set on the display screen of described master controller, and wherein abscissa is time shaft, take abscissa as the boundary, designs an ordinate that makes progress, and shows the amount of tension at two ends; Design a downward ordinate, show the stretching force at two ends.In the tendon drawing process, read in real time stretching force and the amount of tension at two ends by master controller, and stretching force and amount of tension simultaneous display under a coordinate system at the two ends that master controller is read in real time.
When normal stretch-draw, drawn stretching force and the amount of tension at reinforcing bar two ends basically identical, then the two ends that screen shows amount of tension---the stretching force curve overlaps substantially.
When the frictional resistance that is drawn reinforcing bar was unusual, then the numerical curve at two ends produced and separates, and the stretch-draw time of the side that wherein frictional resistance is larger---amount of tension curve flex point occurs or produces fracture of wire.When producing flex point, need to reduce tensioning speed or reduce stretching force, the stretching force curve of opposite side can produce a flex point that reduces rate of extension, to keeping the consistent of two ends amount of tension, so that stretching time is elongated.When producing fracture of wire, then the numerical curve at two ends can produce a saltus step, so that stretching time shortens, needs rejecting to renew, and re-starts the stretching operation.The prestressed, reinforced stretch-draw curve record of stretch-draw case beam is put on record with corresponding case beam number record, as box girder pre-stressed pulling test technical data archives.
The invention has the beneficial effects as follows: advantage of the present invention is: by the screen display of master controller; operating personnel can make things convenient for, judge clearly current stretch-draw operation and whether produce frictional resistance unusually or the fracture of wire phenomenon; and in conjunction with variable quantity numeric ratio pair, determine whether to need to re-start the stretching operation.
Description of drawings (please check each curve title)
Fig. 1 is the box girder pre-stressed tensioning system structural representation of the present invention.
Two ends amount of tension when Fig. 2 is normal stretch-draw---stretching force curve synoptic diagram.
Stretch-draw time when Fig. 3 is normal stretch-draw---amount of tension curve, stretch-draw time---stretching force curve synoptic diagram.
Fig. 4 is two ends amount of tension---the stretching force curve synoptic diagram when producing fracture of wire.
Fig. 5 is stretch-draw time---amount of tension curve, stretch-draw time---the stretching force curve synoptic diagram when producing fracture of wire.
Fig. 6 is two ends amount of tension---the stretching force curve synoptic diagram when producing frictional resistance.
Fig. 7 is stretch-draw time---amount of tension curve, stretch-draw time---the stretching force curve synoptic diagram when producing flex point.
Among the figure: 1, master controller; 2, left front side controller; 3, left end pressure sensor; 4, left end hydrant cart; 5, left end oil pressure punching jack; 6, reinforcing bar; 7, left end displacement transducer; 8, case beam; 9, right-hand member displacement transducer; 10, right-hand member oil pressure punching jack; 11, right-hand member hydrant cart; 12, right-hand member pressure sensor; 13, right front ends controller; 14, two ends amount of tension---stretching force curve; Two ends stretch-draw time---amount of tension curve when 15, normal; Two ends stretch-draw time---stretching force curve when 16, normal; Stretch-draw time---amount of tension curve when 17, producing fracture of wire; Stretch-draw time---stretching force curve when 18, producing fracture of wire; Two ends amount of tension---stretching force curve when 19, producing frictional resistance; Stretch-draw time---amount of tension curve when 20, producing flex point; Stretch-draw time---stretching force curve when 21, producing flex point.
The specific embodiment
With reference to the accompanying drawings 1, the present invention has used the box girder pre-stressed tensioning system of a cover.
Its operation principle is as follows:
Front controller 2, right front ends controller 13 send beginning stretch-draw instruction left by master controller 1, each front controller is controlled respectively left end hydrant cart 4,11 operations of right-hand member hydrant cart, respectively to left end oil pressure punching jack 5,10 oilings of right-hand member oil pressure punching jack pressurization, so that left end oil pressure punching jack 5, right-hand member oil pressure punching jack 10 are along case beam 8 outside tension reinforcing steel bars 6.
Left end pressure sensor 3, right-hand member pressure sensor 12 are measured respectively the oil pressure value of left end oil pressure punching jack 5, right-hand member oil pressure punching jack 10, pass to left front side controller 2, right front ends controller 13, pass to again the stretching force that master controller 1 converses hydraulic jack.Simultaneously, left end displacement transducer 7, right-hand member displacement transducer 9 are measured respectively the amount of tension of reinforcing bar, pass to left front side controller 2, right front ends controller 13, pass to master controller 1 again.Master controller is respectively with amount of tension, and---stretching force curve, stretch-draw time---amount of tension curve and stretch-draw time---, the stretching force curve was presented on the screen.
With reference to the accompanying drawings 2 and Fig. 3, show respectively be normal stretch-draw the time two ends amount of tension---stretching force curve, stretch-draw time---amount of tension curve and stretch-draw time---stretching force curve.When drawing process was normal, the two ends amount of tension---the misalignment between the stretching force curve 14 should be in the scope of a permission.And the normal two ends stretch-draw time---amount of tension curve 15 and normal two ends stretch-draw time---, stretching force curve 16 also overlapped substantially.
According to box girder pre-stressed stretch-draw code requirement, stretching process is as follows: the 0.1S length that first steel tendon stretched, held lotus 20 seconds, and redraw 0.1S, held lotus 20 seconds, purpose is to reduce the impact of frictional resistance and steel tendon internal stress; Phase III stretching 0.8S held lotus 2 minutes.Drawing process finishes.Wherein S is the total amount of tension of steel tendon of regulation.So normal two ends stretch-draw time among Fig. 2---amount of tension curve 15 and normal two ends stretch-draw time---, stretching force curve 16 was the syllogic staircase curve.
With reference to the accompanying drawings 4 and Fig. 5, demonstration be two ends amount of tension---stretching force curve, stretch-draw time---amount of tension curve and stretch-draw time---stretching force curve when the steel tendon fracture of wire in stretching process, occurring.In Fig. 4, the two ends amount of tension---stretching force curve 14 is substantially constant, and when producing fracture of wire the stretch-draw time---amount of tension curve 17 produces an obvious saltus step and stretch-draw time shorten in the phase III of stretch-draw; When equally, producing fracture of wire the stretch-draw time---the stretch-draw time of stretching force curve 18 also shortens.Operating personnel can judge the situation that occurs fracture of wire in stretching process accordingly.
With reference to the accompanying drawings 6 and Fig. 7, be two ends amount of tension when in stretching process, frictional resistance occurring---stretching force curve and stretch-draw time---amount of tension curve, stretch-draw time---the stretching force curve when producing flex point of demonstration.When stretching process produced frictional resistance, the rate of extension of the side that frictional resistance is larger can slow down, and this moment, system can turn down the stretching force of opposite side, and is consistent to the rate of extension that keeps two ends.When produce flex point among Fig. 7 this moment the stretch-draw time---two flex points can successively appear in amount of tension curve 20, a curve that flex point wherein occurs first is the stretch-draw time of the larger side of frictional resistance---amount of tension curve, a rear curve that flex point occurs is because system can turn down the stretching force of opposite side, unanimously causes to two ends stretch-draw speed.
In Fig. 6 left side, the two ends amount of tension when producing frictional resistance---in the stretching force curve 19, curve that two flex points occurred is that system has turned down due to the stretching force of the less side of frictional resistance.Equally, in the stretch-draw time when the generation flex point of Fig. 7 lower right side---the stretching force curve 21, curve that two flex points are arranged is that system has turned down due to the stretching force of the less side of frictional resistance.
Can be found out by Fig. 6 and Fig. 7, because the existence of frictional resistance, so that the stretch-draw time of phase III is elongated.
Master controller 1 can by measure when producing fracture of wire among Fig. 5 the stretch-draw time---amount of tension curve 17 judges whether to occur the fracture of wire phenomenon in the variation of phase III amount of tension speed.Also can be by measuring the stretch-draw time when producing flex point among Fig. 7---amount of tension curve 20 and the stretch-draw time when producing flex point---misalignment of stretching force curve 21 is judged the impact of frictional resistance, and adjusts whereby steel stranded wire penetrating adapter technique.
Simultaneously, the present invention puts the prestressed, reinforced stretch-draw curve record of stretch-draw case beam on record with corresponding case beam number record, as box girder pre-stressed pulling test technical data archives.
In sum, advantage of the present invention is by the amount of tension with coordinate simultaneous display two ends---stretching force curve, stretch-draw time---amount of tension curve and stretch-draw time---amount of tension curve, and the variation of rate of extension is calculated in combination and the amount of tension at two ends---the misalignment of stretching force curve judges whether the phenomenon of fracture of wire or frictional resistance.For the site operation personnel provides a good tensioning process control device.
Claims (2)
1. the control method of a box girder pre-stressed tensioning system stretch-draw parameter, comprise the controller, pressure sensor, hydrant cart, oil pressure punching jack and the displacement transducer that are installed in reinforcing bar to be tensioned two ends, it is characterized in that: also comprise master controller, described master controller is not only controlled tensioning speed and apply stretching force,---stretching force curve, stretch-draw time---amount of tension curve, stretch-draw time---the stretching force curve that also shows simultaneously the stretch-draw curve of tension reinforcing steel bar: amount of tension; When normal stretch-draw, drawn that the amount of tension at reinforcing bar two ends---the stretching force curve overlaps substantially, when the frictional resistance that is drawn reinforcing bar is unusual, stretch-draw time---amount of tension curve flex point occurs or produces fracture of wire, when producing flex point, need to reduce tensioning speed or reduce stretching force, when producing fracture of wire, then rejecting renews, and re-starts the stretching operation.
2. the control method of described a kind of box girder pre-stressed tensioning system stretch-draw parameter according to claim 1, it is characterized in that: the prestressed, reinforced stretch-draw curve record of stretch-draw case beam is put on record with corresponding case beam number record, as box girder pre-stressed pulling test technical data archives.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210465547XA CN102941623A (en) | 2012-11-19 | 2012-11-19 | Control method for tension parameters of box girder prestress tension system |
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| CN201210465547XA CN102941623A (en) | 2012-11-19 | 2012-11-19 | Control method for tension parameters of box girder prestress tension system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114323389A (en) * | 2022-03-14 | 2022-04-12 | 四川交达预应力工程检测科技有限公司 | Prestress detection method, non-grading rapid continuous tensioning method and system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2458616Y (en) * | 2000-11-10 | 2001-11-07 | 李珠 | Intellient controlled prestress stretching device |
| CN1373347A (en) * | 2001-12-06 | 2002-10-09 | 王继成 | Integrated autocontrol tester for prestressed stretch-draw anchor |
| CN1424476A (en) * | 2003-01-09 | 2003-06-18 | 李珠 | Automatic prestressing extension devices |
| US20040211268A1 (en) * | 2003-04-25 | 2004-10-28 | Morelli Donald T. | Magnetic force sensor and control circuit for same |
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2012
- 2012-11-19 CN CN201210465547XA patent/CN102941623A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2458616Y (en) * | 2000-11-10 | 2001-11-07 | 李珠 | Intellient controlled prestress stretching device |
| CN1373347A (en) * | 2001-12-06 | 2002-10-09 | 王继成 | Integrated autocontrol tester for prestressed stretch-draw anchor |
| CN1424476A (en) * | 2003-01-09 | 2003-06-18 | 李珠 | Automatic prestressing extension devices |
| US20040211268A1 (en) * | 2003-04-25 | 2004-10-28 | Morelli Donald T. | Magnetic force sensor and control circuit for same |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114323389A (en) * | 2022-03-14 | 2022-04-12 | 四川交达预应力工程检测科技有限公司 | Prestress detection method, non-grading rapid continuous tensioning method and system |
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Application publication date: 20130227 |