CN101298783B - Method for detecting and checking anchorage cable engineering quality - Google Patents
Method for detecting and checking anchorage cable engineering quality Download PDFInfo
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- CN101298783B CN101298783B CN200710102327XA CN200710102327A CN101298783B CN 101298783 B CN101298783 B CN 101298783B CN 200710102327X A CN200710102327X A CN 200710102327XA CN 200710102327 A CN200710102327 A CN 200710102327A CN 101298783 B CN101298783 B CN 101298783B
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Abstract
A method of detecting and checking anchor engineering quality comprises the anti-drawing force at the anchoring section of the anchor rope; detecting the length of the steel stranded wire at the free section of the anchor rope; accounting the distance between the beginning position of the anchoring section and the aperture according to the detected length of the steel stranded wire at the free section of the anchor rope so as to get the anchoring beginning position of the anchor rope; finally respectively comparing the detected result of the anti-drawing force at the anchoring section of the anchor rope and the detected result of the anchoring beginning position of the anchor rope with the designed anti-drawing force of the anchoring section of the anchor rope and anchoring beginning position of the anchor rope to synthetically judge the engineering quality of the anchor rope. Combined with the existent strength detection of anti-drawing force, the invention detects the anchoring beginning position of the anchor rope by simply detecting the length of the steel stranded wire at the free section of the anchor rope, thereby synthetically detecting the engineering quality of anchor rope, and eliminating huge hidden accidents of quality that omits improper anchoring beginning position of anchor rope in the existent detection method.
Description
Technical field
The present invention relates to the method for detecting and checking anchorage cable engineering quality, be specifically related to a kind of by measuring a kind of method of anchorage cable anchoring section tension pull out force and anchorage cable anchoring original position multifactorial evaluation anchorage engineering quality.
Background technology
Along with the continuous expansion of the national scale of capital construction, the anchor cable engineering structures obtains widely applying in permanent building stabilization workss such as landslide, high slope, cavern, tunnel, dam foundation, deep foundation ditch reinforcing.
As shown in Figure 1, the work progress of anchor cable engineering is roughly as follows:
1, the anchor hole that spuds in the side slope relevant position of need anchoring;
2, work out anchor cable with steel strand;
3, anchor cable is lowered in the anchor hole, the steel strand 122 that the anchor hole aperture is reserved (also claim the stretch-draw section, as the C section among Fig. 1) expose to outside the anchor hole aperture 123, in detecting, the anchor cable workmanship utilize this section exposed parts to detect, promptly free section 12 (121+122) steel strand of A section peripheral hardware sleeve pipe 13 among the figure, be called the i.e. B section among the figure of anchoring section 11 remaining the branch to the bottom, hole; Anchoring section 11 is arranged in below the slope sliding face (figure dotted portion), and the length of free section 12 (121+122) is determined the anchoring original position of anchoring section 11, and free section 12 (121+122) are the anchorage cable anchoring original position with the intersection 14 of anchoring section 11.
3, mortar 4 is injected in the anchor holes until overflowing, anchoring section steel strand 11 are all solidified by mortar, and free section steel strand 12 (being the 121+122 section) are because peripheral hardware sleeve pipe and directly contact with mortar 4, therefore freedom relatively.
Whether the anchor cable engineering of finishing according to above step can really play the requirement that whether gets a desired effect of anchorage effect or anchorage effect to the engineering that need are reinforced, and also needs just know by inspection and acceptance.And because anchor cable engineering construction relative complex, difficulty of construction is big under the part complex geological condition, and be concealed work, so anchor cable engineering structures easy some quality problems of generation in work progress, and then cause safety first engineering accidents such as side slope unstability, cavern cave in that generation is arranged more.Therefore inspection of quality and the detection for the anchor cable engineering structures seems particularly important.
At present, quality examination acceptance method to the anchor cable engineering only limits to anchorage cable anchoring section resistance to plucking test acceptance method, it also is the detection acceptance method that present current national codes regulation is adopted, promptly by stretch-draw instruments such as jack, oil pumps the anchor cable steel strand are carried out stretch-draw, whether the tension pull out force of check anchorage cable anchoring section reaches the uplift resistance that design standard requires.But pull-out test is just checked the tension pull out force of anchoring section, but can not detect for the position whether the anchoring original position reaches designing requirement.
The anchor cable structure action principle is: the tension pull out force that provides by anchoring section is stabilized in the unstable soil body to be stablized on the soil body, and whether anchor cable structure can reach the anchoring purpose two main key points: 1, anchoring section must be positioned at and stablize on the soil body; 2, anchoring section provides enough tension pulls out force.Existing tension pull out force acceptance test has just checked be whether the tension pull out force of anchoring section reaches designing requirement at the 2nd, but fails check for whether being anchored at good ground.Therefore acceptance(check) can occur, but the anchoring original position of anchor cable does not reach the problem of design attitude, therefore existing acceptance method can cause serious hidden danger of quality.And can play as long as guarantee that anchoring section intensity is enough, whether enough whether free section steel strand length or anchoring original position reach the wrong direction that designing requirement can be ignored or reduce.Artificially jerry behavior in the construction of free section steel strand of certain existence in the practice of construction is because this kind behavior can not be found by examination under present acceptance method.
Summary of the invention
The present invention is intended to the deficiency at existing anchor cable acceptance of engineering quality method, development in conjunction with the characteristics and the existing detection technique of anchor cable structure, propose by detecting anchorage cable anchoring section tension pull out force and anchorage cable anchoring original position multifactorial evaluation anchor cable method for quality, to remedy the defective of existing detection method.
The present invention adopts following technical scheme:
A kind of method for detecting and checking anchorage cable engineering quality comprises: the tension pull out force of measuring the anchorage cable anchoring section; Measure the length of the free section of anchor cable steel strand; According to the original position of the free section of the anchor cable that determines steel strand length computation anchoring section distance, obtain the anchoring original position of anchor cable thus to the aperture; At last according to the results of measuring of the measurement result of anchorage cable anchoring section tension pull out force and anchorage cable anchoring original position respectively with the anchorage cable anchoring section tension pull out force of design and the anchorage cable anchoring original position multifactorial evaluation anchor cable workmanship that compares.
For saving unnecessary manpower, material resources and waste of time, calculate the original position of anchoring preferably before mensuration to the mensuration of the free section of anchor cable steel strand length and according to free section steel strand length to anchorage cable anchoring section tension pull out force, the promptly first original position of measuring anchor cable free section steel strand length and calculating anchorage cable anchoring according to this length, to not meeting the anchor cable that the anchoring original position requires, it is defective promptly to pass judgment on this anchor cable workmanship, do not need to carry out again next step anti-pulling test, and to the anchor cable of anchoring original position acceptance(check), carry out next step existing anti-pulling test again, check and accept the tension pull out force of anchoring section.
The concrete steps of measuring the free section of anchor cable steel strand length and measuring and calculating anchoring original position are as follows:
b
1, the installation and measuring assembly: the shockwave sensor that will detect usefulness is connected with the steel strand termination that the anchor hole aperture is reserved, and the stress wave detector is connected with shockwave sensor again;
b
2, knock parts to be detected and excite stress wave: knock the steel strand termination of reserving in the anchor hole aperture and excite stress wave, excitation wave produces back wave in the free section of steel strand with the anchoring section boundary, and shockwave sensor is gathered back wave and also sent to the stress wave detector;
c
1, the measuring and calculating anchorage point: read the stress wave detector and detect the excitation signal collect and the time between the reflected signal, multiply by the spread speed of stress wave in steel strand, obtain the distance that stress wave is propagated back and forth in free section, 1/2 of this propagation distance is the length of free section steel strand, deduct the steel strand length that the anchor hole aperture is reserved, obtain the distance of anchoring section original position, promptly obtain the anchoring original position of anchor cable apart from the aperture.
Contrast is judged according to testing result at last: compare with the anchoring original position that meets design, judge whether anchor cable reaches the anchoring original position that adheres to specification.
At above b
2, c
1In the step, be to use wave propagation and principle of reflection, i.e. the propagation of ripple in homogeneous medium when medium changes, will produce a back wave at the variation interface.Utilize the stress wave detector, can record the time between excitation wave signal and the reflection wave signal, this time be multiply by the spread speed of ripple in this medium, can obtain the propagation distance of ripple in this medium.In the anchor cable engineering, the steel strand termination of reserving in the anchor hole aperture excites stress wave, stress wave is propagated in free section, when arriving, ripple reflects when the free section position, boundary with anchoring section is the anchoring original position, thereby multiply by the speed that ripple is propagated with the time of the detected reception back wave of stress wave detector in steel strand, obtaining is the distance that ripple is propagated in free section steel strand, 1/2 of this distance should be the length of free section steel strand, deduct the steel strand length that the anchor hole aperture is reserved again, obtain the distance of anchoring section original position, promptly obtain the anchoring original position apart from the aperture.
In addition, in anchor cable engineering construction process, because when mortar being injected in the anchor cable hole, can be stained with unavoidably on some steel strand of reserving to the anchor hole aperture and influence testing result, when therefore the steel strand of reserving in the anchor hole aperture speckle with mortar or other foul, be step b carrying out installation steps
1The preceding steel strand that should clean the reservation of anchor hole aperture.
Further, for the qualified anchor cable of anchor cable original position, also to carry out the tension pull out force and check and accept experiment, whether could intactly measure the anchor cable workmanship adheres to specification, because it is qualified only to detect the anchor cable original position, and do not mean that the anchor cable engineering is qualified, also must carry out tension pull out force acceptance test, and the tension pull out force is checked and accepted experiment according to existing general test method, generally comprises following steps:
E, installation tensioning equipment, construction concrete counter-force structure, after concrete reached the length of time, beginning tension pull out force was checked and accepted experiment;
F, according to checking and accepting the load grading tension, the displacement of record anchor head obtains the stretch-draw curve;
G, when load reach check and accept load after, stop test, judge that then the tension pull out force is qualified; Otherwise, do not check and accept load and when causing anchor cable that infringement takes place, this anchor cable engineering is defective when load reaches.
Because tension pull out force acceptance test has been the detection method commonly used of present anchor cable acceptance of engineering quality, therefore, repeats no more in the present invention for its specific implementation process and step.
The present invention calculates the anchorage cable anchoring original position by the length that detects the free section of anchor cable steel strand simply, detect in conjunction with existing anchorage cable anchoring section tension pull out force test, the workmanship of multifactorial evaluation anchor cable has been eliminated in the existing detection method and has been omitted the detection of anchoring original position and the great hidden danger of quality that causes thus.
Description of drawings
For further setting forth technological means and the effect that the present invention takes for the predetermined purpose of realization, the present invention has been described in detail in conjunction with following accompanying drawing, purpose of the present invention, feature and characteristics, can obtain thus going deep into and concrete understanding, yet accompanying drawing only provides reference and explanation usefulness, is not to be used for the present invention is limited.
Fig. 1 is the structural representation of prior art anchor cable engineering;
Fig. 2 is the present invention's stress wave propagation oscillogram in steel strand when adopting the stress wave detector to measure free section steel strand length;
Fig. 3 is the schematic flow sheet of method for detecting and checking anchorage cable engineering quality of the present invention.
The specific embodiment
Below in conjunction with drawings and Examples the present invention is described in further detail.
As shown in Figure 1, a speedway high slope adopts anchor cable engineering 1 to reinforce persistent erection decomposed granite stratum.The installation process of anchor cable engineering does not repeat them here as mentioned before.Needing that now this anchor cable engineering 1 is carried out quality examination checks and accepts.
The design standard of this anchor cable engineering is: the anchor cable design length: 28 meters, and free segment length As:18 rice, anchoring section length: 10 meters, design tension pull out force: (qualified tension pull out force standard) 600KN.
By existing detection method, promptly adopt pull-out test to carry out an acceptance inspection, the tension pull out force that obtains this anchor cable reaches: 720KN is 120% of design tension pull out force.
The examination way of only checking and accepting pulling capacity according to present standard: this anchor cable pull-out test tension pull out force 720KN is greater than qualified tension pull out force standard 600KN, and it is up-to-standard therefore ought to pass judgment on this anchor cable.
But by adopting the stress wave detector, after calculating to the steel strand length detection of free section and to the anchoring original position, discovery tangible reflection wave signal occurs 16.7 meters positions, and free section steel strand 12 long A:16.7 rice are described, detailed process is calculated as follows:
Show by the detected oscillogram of stress wave detector (Fig. 2):
Excitation wave during to 6.524 milliseconds, detects back wave since the time 0; Stress wave spread speed in steel strand is 5120 meter per seconds, and the length A that then calculates the free section 12 of steel strand length is:
6.524 millisecond * 5120 meter per seconds * 1/2=16.70 rice.
Deduct the length C of the 1.5 meters long steel strand of reserving in the anchor hole aperture 122 (being the stretch-draw section), is 15.2 meters from the aperture to the degree of depth of anchoring section original position 14, and the design standard position should be 18 meters, therefore shallow 2.8 meters than design attitude of the anchoring original positions of judging this anchor cable engineering can not reach the design attitude requirement.Therefore this anchor cable quality is seriously defective.
Put other anchor cable engineering worker and repeatedly to find this problem in the detection.Unit in charge of construction utilizes the deficiency that detects acceptance method at present, and construction anchor cable degree of depth deficiency causes numerous serious hidden danger of quality.
The length measurment of above free section steel strand and as follows to the measuring and calculating concrete steps of anchoring original position:
b
1, steel strand 122 terminations reserved, shockwave sensor 2 and the anchor hole aperture that will detect usefulness are connected, again stress wave detector 3 is connected with shockwave sensor 2;
b
2, knock steel strand 12 terminations of reserving in the anchor hole aperture and excite stress wave, excitation wave will be that the anchoring original position 14 that this area is commonly called as produces back wave at free section 12 of steel strand and anchoring section 11 boundarys, and shockwave sensor 2 is gathered back wave and sent to stress wave detector 3;
c
1, read stress wave detector 3 and detect the excitation signal that collects and the time between the reflected signal, multiply by the spread speed of stress wave in steel strand, obtain the distance that stress wave is propagated back and forth at free section steel strand, 1/2 of this propagation distance is the length A of free section steel strand, deduct the steel strand C that the anchor hole aperture is reserved, obtain the distance of anchoring section original position, promptly obtain the original position of anchoring apart from the aperture.
For the steel strand 122 that the anchor hole aperture is reserved can transmit stress wave preferably, generally before step a, to clean the steel strand 122 that the anchor hole aperture is reserved earlier.
In addition, for saving unnecessary manpower, material resources and waste of time, to the mensuration of the free section of anchor cable steel strand length and to the measuring and calculating of anchoring original position preferably before mensuration to anchorage cable anchoring section tension pull out force, promptly measure anchor cable free section steel strand length earlier and calculate the anchoring original position with this, to not meeting the anchor cable that the anchoring original position requires, promptly directly this anchor cable workmanship of evaluation is defective, do not need to carry out again next step anti-pulling test, and to the anchor cable of anchoring original position acceptance(check), carry out next step existing anti-pulling test again, measure the tension pull out force of checking and accepting anchoring section.
Therefore, adopt in the method for comprehensive detection anchor cable workmanship of the present invention, order detects below general the employing:
1, after anchor cable construction finishes, the characteristics of utilizing the free section of anchor cable steel strand to be subjected to casing protection and isolating with mortar on every side, adopt existing stress wave detecting instrument accurately to detect the length of the free section of anchor cable steel strand, the anchoring section original position of calculating anchor cable by the length that detects free section promptly obtains the anchoring original position to the distance in aperture and whether reaches design attitude;
2, after the acceptance(check) of anchoring original position, carry out next step existing anti-pulling test again, measure the tension pull out force of checking and accepting anchoring section, check and accept underproof anchor cable for the anchoring original position and judge directly that then it is off quality.
The groundwork step that stretching resistance is checked and accepted experiment is:
E, installation tensioning equipment;
F, grading tension;
G, judge according to the stretch-draw result whether the uplift resistance of anchorage cable anchoring section reaches designing requirement.
Comprehensively check and accept by 1,2, will check and accept the comprehensive anchoring effect of comprehensively passing judgment on anchor cable structure of the two combination of tension pull out force that anchoring original position and anchoring section provide, guarantee the safety of anchor cable engineering structures.
Fig. 3 describes each implementation step of the present invention in detail for the schematic flow sheet of method for detecting and checking anchorage cable engineering quality of the present invention.
As known by the technical knowledge, the present invention can realize by other the embodiment that does not break away from its spiritual essence or essential feature.Therefore, above-mentioned disclosed embodiment with regard to each side, all just illustrates, and is not only.All within the scope of the present invention or the change in being equal to scope of the present invention all be included in the invention.
Claims (6)
1. method for detecting and checking anchorage cable engineering quality comprises step a, measures the tension pull out force of anchorage cable anchoring section, it is characterized in that, and is further comprising the steps of:
The length of b, the free section of mensuration anchor cable steel strand;
The original position of c, the free section of the anchor cable steel strand length computation anchoring section that goes out according to the b step measurements obtains the anchoring original position of anchor cable thus to the distance in aperture;
D, with the results of measuring of the measurement result of anchorage cable anchoring section tension pull out force and anchorage cable anchoring original position respectively with designed anchorage cable anchoring section tension pull out force and the anchorage cable anchoring original position multifactorial evaluation anchor cable workmanship that compares.
2. method for detecting and checking anchorage cable engineering quality according to claim 1 is characterized in that, carries out the mensuration to the free section of anchor cable steel strand length before anchorage cable anchoring section tension pull out force is measured earlier.
3. method for detecting and checking anchorage cable engineering quality according to claim 2 is characterized in that, described mensuration to the free section of anchor cable steel strand length adopts stress wave to detect.
4. method for detecting and checking anchorage cable engineering quality according to claim 3 is characterized in that, further may further comprise the steps to the mensuration that detects the free section of anchor cable steel strand length with to the measuring and calculating of the anchoring original position of anchor cable in described b, the c step:
b
1, the installation and measuring assembly: the shockwave sensor that will detect usefulness is connected with the steel strand termination that the anchor hole aperture is reserved, and the stress wave detector is connected with shockwave sensor again;
b
2, knock parts to be detected and excite stress wave: knock the steel strand termination of reserving in the anchor hole aperture and excite stress wave, excitation wave produces back wave in the free section of steel strand with the anchoring section boundary, and shockwave sensor is gathered back wave and also sent to the stress wave detector;
c
1, measuring and calculating anchoring original position: read the stress wave detector and detect the excitation signal that collects and the time between the reflected signal, multiply by the spread speed of stress wave in steel strand, obtain the distance that stress wave is propagated back and forth in free section, 1/2 of this propagation distance is the length of free section steel strand, deduct the steel strand length that the anchor hole aperture is reserved, obtain the distance of anchoring section original position, promptly obtain the anchoring original position of anchor cable apart from the aperture.
5. method for detecting and checking anchorage cable engineering quality according to claim 4 is characterized in that, is carrying out b
1Clean the steel strand that the anchor hole aperture is reserved before the step earlier.
6. according to each described method for detecting and checking anchorage cable engineering quality of claim 1 to 5, it is characterized in that described mensuration to anchorage cable anchoring section tension pull out force may further comprise the steps:
E, installation tensioning equipment;
F, grading tension;
G, judge according to the stretch-draw result whether the tension pull out force of anchorage cable anchoring section reaches designing requirement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710102327XA CN101298783B (en) | 2007-04-30 | 2007-04-30 | Method for detecting and checking anchorage cable engineering quality |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710102327XA CN101298783B (en) | 2007-04-30 | 2007-04-30 | Method for detecting and checking anchorage cable engineering quality |
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| Publication Number | Publication Date |
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| CN101298783A CN101298783A (en) | 2008-11-05 |
| CN101298783B true CN101298783B (en) | 2011-03-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200710102327XA Expired - Fee Related CN101298783B (en) | 2007-04-30 | 2007-04-30 | Method for detecting and checking anchorage cable engineering quality |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103499320A (en) * | 2013-10-22 | 2014-01-08 | 中铁西北科学研究院有限公司深圳南方分院 | Anchoring engineering quality detector and analysis method |
| CN104089695A (en) * | 2014-07-04 | 2014-10-08 | 南华大学 | Method for measuring spreading speed of stress waves in anchor rod |
| CN104265338B (en) * | 2014-09-17 | 2016-09-21 | 刘冰 | A kind of roadway support unit efficiencies determines method |
| CN105672310B (en) * | 2016-01-28 | 2018-04-20 | 中冶建筑研究总院（深圳）有限公司 | Anchor pole displacement measuring means and method |
| CN113159486A (en) * | 2021-01-19 | 2021-07-23 | 深圳市都信建设监理有限公司 | Electronic prevention and control project quality supervision method and system |
| CN114059602A (en) * | 2021-10-21 | 2022-02-18 | 西南交通大学 | Anchor cable prestress nondestructive detection system and detection method |
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2007
- 2007-04-30 CN CN200710102327XA patent/CN101298783B/en not_active Expired - Fee Related
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