CN101692014A - Method for reverse pull detection of prestressing force under anchor of anchor cable - Google Patents
Method for reverse pull detection of prestressing force under anchor of anchor cable Download PDFInfo
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- CN101692014A CN101692014A CN200910191142A CN200910191142A CN101692014A CN 101692014 A CN101692014 A CN 101692014A CN 200910191142 A CN200910191142 A CN 200910191142A CN 200910191142 A CN200910191142 A CN 200910191142A CN 101692014 A CN101692014 A CN 101692014A
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Abstract
The invention discloses a method for the reverse pull detection of a prestressing force under an anchor of an anchor cable. In the method, a pulling force opposite to the direction of the prestressing force of the anchor is adopted, a tensile displacement-pull-up curve is established in a two-dimensional coordinate system, a process of slope changes of the curve is analyzed, a pull force is applied continuously if the slope is stable, and the numerical value of the pulling force corresponding to a catastrophe point on the curve is determined as a numerical value of the prestressing force under the anchor if the slope is suddenly reduced. The method can accurately measures the numerical value of the prestressing force under the anchor by adopting an external reverse pull method and utilizing the characteristics of the prestressing force on the basis of the relationship between the tensile displacement and the pulling force and has a great significance for the control of the construction quality of a newly constructed anchoring engineering and the master of the operation state and safety of the prior anchoring engineering.
Description
Technical field
The present invention relates to a kind of civil engineering work detection method, particularly a kind of method for reverse pull detection of prestressing force under anchor of anchor cable.
Background technology
Prestressing techniques such as anchor cable are used widely in civil engineering work.As it is stable etc. to be used for slope reinforcement, bridge prestress concrete, tunnel and underground works reinforcing and Deformation control, works.
Prestress engineerings such as anchor cable not only use amount are increasing, and are directly connected to the security and stability of engineering.Prestress such as anchor cable are as initiatively applying prestressed engineering, and the security and stability of engineering depends on the reinforcement effect of anchor cable to a great extent.
Anchor lower prestress refers to the tension force of anchor cable, i.e. the actual pulling force numerical value of prestress anchorage cable.For new construction, refer to the effective prestress value behind the construction stretching; To the operation engineering, refer to the work prestress value.
The actual pulling force that anchor cable provided is much, does prestress lose excessive or overload after construction stretching puts, moves a period of time in place? this problem is perplexing anchoring engineering circle always, does not also have reliable detection method at present.Present method be the construction stage with regard to pre-buried force cell, thereby anchor lower prestress is monitored.But,, just can't detect the size of anchor lower prestress if do not have pre-buriedly in the construction stage.And the cost of pre-buried force cell is higher, is difficult to bury underground in a large number, adopts the survival rate of general sensor also lower, is difficult to permanently effective.
Therefore, seek a kind of prestressing force under anchor of anchor rope detection method, and can test out the numerical value of prestressing force under anchor of anchor rope exactly, to the construction quality of controlling newly-built anchoring engineering, grasp the existing anchorage engineering operation conditions and security significant.
Summary of the invention
In view of this, the invention provides a kind of method for reverse pull detection of prestressing force under anchor of anchor cable, can test out the numerical value of anchor lower prestress exactly, to the construction quality of controlling newly-built anchoring engineering, grasp the existing anchorage engineering operation conditions and security significant.
Method for reverse pull detection of prestressing force under anchor of anchor cable of the present invention may further comprise the steps:
A. the revealed section to anchor cable applies the pulling force opposite with the anchor lower prestress direction, gather and record stretching displacement numerical value and pulling force numerical value, with the stretching displacement is horizontal ordinate, pulling force is that ordinate is set up stretching displacement and pulling force two-dimensional coordinate system, sets up stretching displacement-pull-up curve according to stretching displacement numerical value and pulling force numerical value in two-dimensional coordinate system;
B. calculate the slope of stretching displacement-pull-up curve, slope is the ratio of some ordinates and horizontal ordinate on stretching displacement-pull-up curve;
C. judge the slope variation situation,, continue to apply pulling force and repeat the b step if slope is stable; If slope diminishes suddenly, the pulling force numerical value of catastrophe point correspondence is anchor lower prestress numerical value on the curve.
Further, among the step a, the revealed section of anchor cable is applied pulling force realize by lifting jack;
Further, among the step a, be provided with displacement transducer and strain gauge, described displacement transducer is used to gather the stretching displacement of anchor cable, strain gauge is used to gather the pulling force to the revealed section generation of anchor cable, and the stress signal that displacement signal that described displacement transducer is gathered and strain gauge are gathered is all handled the back by data processing equipment and inserted computing machine; Set up among the step a among two-dimensional coordinate system and stretching displacement-pull-up curve, the step b and to judge among slope calculations and the step c that the slope variation situation finishes by computing machine.
Beneficial effect of the present invention: method for reverse pull detection of prestressing force under anchor of anchor cable of the present invention, utilize the characteristic of prestress anchorage cable, relation according to stretching displacement and pulling force, can record anchor lower prestress numerical value accurately, significant to the construction quality of controlling newly-built anchoring engineering with operation conditions and the security of grasping existing anchoring engineering.
Description of drawings
Below in conjunction with drawings and Examples the present invention is further described.
Fig. 1 is a principle of the invention block diagram;
Fig. 2 is stretching displacement and pulling force two-dimensional coordinate figure;
Fig. 3 is apparatus of the present invention structural representation.
Embodiment
Fig. 1 is a principle of the invention block diagram, and Fig. 2 is stretching displacement and pulling force two-dimensional coordinate figure, and Fig. 3 is apparatus of the present invention structural representation, and as shown in the figure: the method for reverse pull detection of prestressing force under anchor of anchor cable of present embodiment may further comprise the steps:
A. the revealed section to anchor cable applies the pulling force opposite with the anchor lower prestress direction, gathers also record stretching displacement numerical value and pulling force numerical value, the revealed section of anchor cable is applied pulling force realize that by punching hydraulic jack 1 simple in structure, cost is low;
The revealed section 31 of described anchor cable 3 passes punching hydraulic jack 1 and fixedlys connected by anchor clamps 4 with the piston 11 of punching hydraulic jack 1, and punching hydraulic jack 1 bottom withstands on the ground tackle 32 of anchor cable by backing plate 5, is beneficial to protection ground tackle 32 and is not damaged;
Be provided with displacement transducer 2 and strain gauge 7, described displacement transducer 2 is used to gather the stretching displacement of anchor cable, just the piston 11 of punching hydraulic jack 1 ejects displacement, strain gauge 7 is used to gather the pulling force that the revealed section 31 of 1 pair of anchor cable 3 of punching hydraulic jack produces, and the stress signal that displacement signal that described displacement transducer 2 is gathered and strain gauge 7 are gathered is all handled back access computing machines 9 by data processing equipment 8; Displacement transducer 2 fixedly installs by Magnetic gauge stand 6; Be horizontal ordinate with stretching displacement S in computing machine 9, tensile force f is that ordinate is set up stretching displacement and pulling force two-dimensional coordinate system, sets up stretching displacement-pull-up curve (as shown in Figure 2) according to stretching displacement numerical value and pulling force numerical value in two-dimensional coordinate system;
B. the slope by COMPUTER CALCULATION stretching displacement-pull-up curve, slope are the ratio of some ordinates and horizontal ordinate on stretching displacement-pull-up curve;
C. judge the slope variation situation by computing machine,, continue to apply pulling force and repeat the b step if slope is stable; If slope diminishes suddenly, the pulling force numerical value of catastrophe point correspondence is anchor lower prestress numerical value on the curve; According to slope variation situation output examining report, visual inspection anchor lower prestress;
As shown in Figure 2: instead draw back when beginning, tensile force f slowly increases, and installs between each components the space and compresses gradually and finish the pretension process, and slope slowly increases, and is curve OA section among the figure; Then along with the space is all compacted, the tension of revealed section 31, the slope of a curve regional stability, be curve A B section among the figure, tensile force f continues to increase, when tensile force f increases to a certain degree, this moment, it is minimum that stiction reaches because the interior external broach of anchor cable is very approaching, and anchor cable 3 is issued to a balance in the tensile force f effect, anchor cable 3 is in a state that is about to be pulled and is not moved, the revealed section 31 of anchor cable 3 is together stressed with free section, and the stretch value of anchor cable is from revealed section elongation becoming revealed section and the common elongation of free section, and rate of curve diminishes, be curve B C section among the figure, the value of thrust that rate of curve catastrophe point B point is corresponding is effective prestress numerical value.
Explanation is at last, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (3)
1. method for reverse pull detection of prestressing force under anchor of anchor cable is characterized in that: may further comprise the steps:
A. the revealed section to anchor cable applies the pulling force opposite with the anchor lower prestress direction, gather and record stretching displacement numerical value and pulling force numerical value, with the stretching displacement is horizontal ordinate, pulling force is that ordinate is set up stretching displacement and pulling force two-dimensional coordinate system, sets up stretching displacement-pull-up curve according to stretching displacement numerical value and pulling force numerical value in two-dimensional coordinate system;
B. calculate the slope of stretching displacement-pull-up curve, slope is the ratio of some ordinates and horizontal ordinate on stretching displacement-pull-up curve;
C. judge the slope variation situation,, continue to apply pulling force and repeat the b step if slope is stable; If slope diminishes suddenly, the pulling force numerical value of catastrophe point correspondence is anchor lower prestress numerical value on the curve.
2. method for reverse pull detection of prestressing force under anchor of anchor cable according to claim 1 is characterized in that: among the step a, the revealed section of anchor cable is applied pulling force realize by lifting jack.
3. method for reverse pull detection of prestressing force under anchor of anchor cable according to claim 2, it is characterized in that: among the step a, be provided with displacement transducer and strain gauge, described displacement transducer is used to gather the stretching displacement of anchor cable, strain gauge is used to gather the pulling force that the revealed section to anchor cable applies, and the stress signal that displacement signal that described displacement transducer is gathered and strain gauge are gathered is all handled the back by data processing equipment and inserted computing machine; Set up among the step a among two-dimensional coordinate system and stretching displacement-pull-up curve, the step b and to judge among slope calculations and the step c that the slope variation situation finishes by computing machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910191142XA CN101692014B (en) | 2009-10-16 | 2009-10-16 | Method for reverse pull detection of prestressing force under anchor of anchor cable |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910191142XA CN101692014B (en) | 2009-10-16 | 2009-10-16 | Method for reverse pull detection of prestressing force under anchor of anchor cable |
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| Publication Number | Publication Date |
|---|---|
| CN101692014A true CN101692014A (en) | 2010-04-07 |
| CN101692014B CN101692014B (en) | 2011-04-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200910191142XA Expired - Fee Related CN101692014B (en) | 2009-10-16 | 2009-10-16 | Method for reverse pull detection of prestressing force under anchor of anchor cable |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102278964A (en) * | 2011-08-03 | 2011-12-14 | 宁夏路桥工程股份有限公司 | Wireless stretching elongation sensor |
| CN103454026A (en) * | 2013-08-30 | 2013-12-18 | 河南省水利勘测设计研究有限公司 | Measuring system and measuring method for multi-beam flat anchor prestress of thin wall concrete structure |
| CN104075850A (en) * | 2013-03-28 | 2014-10-01 | 海洋王（东莞）照明科技有限公司 | Lamp cable introducing device tester |
| CN112461408A (en) * | 2020-09-29 | 2021-03-09 | 河南牛帕力学工程研究院 | Prestressed tendon stress detection method |
| CN114319348A (en) * | 2022-03-14 | 2022-04-12 | 四川交达预应力工程检测科技有限公司 | Rock mass deformation detection method, self-adaptive prestress tensioning method and tensioning system |
| 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 |
-
2009
- 2009-10-16 CN CN200910191142XA patent/CN101692014B/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102278964A (en) * | 2011-08-03 | 2011-12-14 | 宁夏路桥工程股份有限公司 | Wireless stretching elongation sensor |
| CN104075850A (en) * | 2013-03-28 | 2014-10-01 | 海洋王（东莞）照明科技有限公司 | Lamp cable introducing device tester |
| CN103454026A (en) * | 2013-08-30 | 2013-12-18 | 河南省水利勘测设计研究有限公司 | Measuring system and measuring method for multi-beam flat anchor prestress of thin wall concrete structure |
| CN112461408A (en) * | 2020-09-29 | 2021-03-09 | 河南牛帕力学工程研究院 | Prestressed tendon stress detection method |
| CN114319348A (en) * | 2022-03-14 | 2022-04-12 | 四川交达预应力工程检测科技有限公司 | Rock mass deformation detection method, self-adaptive prestress tensioning method and tensioning system |
| 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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| Publication number | Publication date |
|---|---|
| CN101692014B (en) | 2011-04-20 |
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