CN1818234A - Method for detecting reinforcing bar cage length of concrete pouring pile by electric logging method - Google Patents
Method for detecting reinforcing bar cage length of concrete pouring pile by electric logging method Download PDFInfo
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- CN1818234A CN1818234A CN200610038752.2A CN200610038752A CN1818234A CN 1818234 A CN1818234 A CN 1818234A CN 200610038752 A CN200610038752 A CN 200610038752A CN 1818234 A CN1818234 A CN 1818234A
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000003014 reinforcing effect Effects 0.000 title claims description 74
- 238000005259 measurement Methods 0.000 claims description 26
- 238000001514 detection method Methods 0.000 claims description 10
- 238000005070 sampling Methods 0.000 claims description 4
- 210000003205 muscle Anatomy 0.000 description 5
- 238000005553 drilling Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
- 238000004313 potentiometry Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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Abstract
This is a method to detect the length of concrete bars by an instrument. An electrical instrument detects the altitude potential or potential difference to figure out the length of the concrete bars in a hole in the pile or parallel to it. The working theory is based on the different conductivity between concrete and concrete bars.
Description
One, technical field
The present invention relates to the building foundation detection technique, specifically is exactly the method for judging length of reinforcing cage in the castinplace pile by electrolog.
Two, background technology
Castinplace pile has advantages such as bearing capacity height, construction technology are simple relatively, and quilt is extensively as the basis of industry such as bridge, viaduct, life and production house with civil building.Because of concealed work under the castinplace pile possession, unit in charge of construction's phenomenon of using inferior materials and turning out substandard goods happens occasionally, particularly the length of reinforcing cage situation that can not meet design requirement frequently takes place especially, and stability, anti-seismic performance that this has had a strong impact on bored concrete pile foundation have constituted the hidden danger of building.
At present, castinplace pile integrity detection and bearing capacity detect existing ripe method, but the length of reinforcing cage detection lacks efficient ways always.
Up to now, also there are a collection of experts and scholars to attempt studying, exploring the method that detects length of reinforcing cage both at home and abroad, use the internal flaw that the transient electromagnetic induction well logging method is surveyed the concrete pile reinforcing cage at first as the Korean; Domestic transient state reflective wave method and the geological radar method technology for detection length of reinforcing cage of also once adopting.But owing to be subjected to the restriction of method and technology and instrument itself, these methods still can not solve the problem that length of reinforcing cage detects well, let alone apply.
Three, summary of the invention
1, goal of the invention
Purpose of the present invention aims to provide reinforcement cage length non-destructive test method in a kind of new castinplace pile.
2, technical scheme
The present invention is by drilling through the hole (10) that is parallel to castinplace pile in type castinplace pile (5) or by the stake, utilize existing electric logger (7) test in variation (being similar to the mise-a-la-masse method in the electrical prospecting), and judge the method for reinforcing cage (6) length in view of the above reinforcing cage (6) charge condition lower edge drilling depth direction current potential or potential difference.Its principle is as follows: castinplace pile is by two kinds of media that electrical property feature is different---reinforcing bar and concrete are formed, coagulation penus high resistance class medium wherein, and reinforcing bar belongs to good conductor, both electrical property differences are bigger.
By electric logger (7) the electrodes of A utmost point (1) is connected on the reinforcing bar that ground exposes, and the current electrode B utmost point (2) is placed (suitable 〉=5 times stake is long) beyond the certain distance.When the earth is powered, between two electrodes, produce electric field,, can judge the electrical variation of ambient medium by the isoparametric variation of current potential, potential difference and resistivity in the measurement electrode M utmost point (3) and the measurement electrode N utmost point (4) the measurement electric field.Before detecting earlier in castinplace pile (5) or apart from the place of castinplace pile edge≤1m drill through be parallel to castinplace pile (5) boring (10) one to two, drilling depth should be greater than estimating or design reinforcing cage (6) length 3m.Then, the measurement electrode M utmost point (3) is placed in the boring (10), the N utmost point (4) is placed on a certain position, ground (disturbing but should avoid exchanging), measures along the current potential U of boring (10) different depth
mOr the measurement electrode M utmost point (3), the N utmost point (4) placed boring (pole span of the M utmost point, the N utmost point is advisable with 0.05m-0.5m) simultaneously, measure along the potential difference U of boring (10) direction different depth
Mn
Obviously, reinforcing cage in the pile body (6) its current potential of section or potential difference are relatively stable in a certain number range, and when being positioned at when reinforcing cage and no-reinforcing-bar cage interface are arranged, significant change will take place for current potential or potential difference, and along with away from reinforcing cage, it is relatively stable that its current potential or potential difference are tending towards again.Utilize this variation characteristic of current potential or potential difference can determine the length of reinforcing cage (6) in the castinplace pile comparatively exactly, wherein the bottom interface of reinforcing cage (6) is the measured current potential or sudden change place of potential difference.A kind of method with length of reinforcing cage in the electrical logging detection cast-in-place concrete pile, its detection method step is as follows:
A, in castinplace pile (5) or apart from the castinplace pile edge≤one of 1m ground drill with ferrule is parallel to the boring (10) of castinplace pile (5), hole depth should be greater than the long 3m of castinplace pile (5), the external diameter 1cm of the electrode group that the aperture should be formed greater than the measurement electrode M utmost point (3) or the measurement electrode M utmost point (3), the N utmost point (4);
B, down with the porose pvc pipe of filter screen (11);
C, the A utmost point (1) being connected on certain root reinforcing bar of reinforcing cage (6) by electric logging meter (7), the B utmost point (2) is placed on 〉=and the long place of 5 times of castinplace piles (5) powers;
D, put into the measurement electrode M utmost point (3) in (10), and place the measurement electrode N utmost point (4) ground to avoid exchanging a certain position of interference in boring; Or the M utmost point (3), the N utmost point (4) are formed fixed pole apart from putting into boring (10) for the electrode group of 0.05m-0.5m;
E, the M utmost point (3) is linked to each other with electric logger (7) by depth encoder (9), the N utmost point (4) is also linked to each other with electric logger (7); Or the M utmost point (3) all passes through depth encoder (9) with the N utmost point (4) and links to each other with electric logger (7);
F, from boring (10), carry out current potential U from top to bottom or from the bottom up with the sampling interval of 10-50cm
mOr potential difference U
MnMeasurement;
G, measured value is plotted curve with change in depth, sudden change place of curve, be the bottom interface of reinforcing cage (6), and deep calibration is read on the lead (8) that reinforcing cage (6) length can link to each other according to depth encoder (9) record or by the electrode group of forming with the measurement electrode M utmost point (3) or the measurement electrode M utmost point (3), the N utmost point (4) in the boring (10).
3. beneficial effect
The present invention utilizes detected object---and the electrical property difference of reinforcing bar and two kinds of media of concrete detects length of reinforcing cage in the reinforcing cage, and principle is clear reliable; Because of adopting conventional electric logger just can realize, historical facts or anecdotes is executed and is promoted simply; Because of only needing also to play the similar detection effect, so it is low to detect cost in stake Zhou Tuzhong boring; Because of not needing cumbersome data to handle, so method is intuitively simple.In addition, the present invention still can be applicable to the detection of the old bridge base and the dam foundation degree of depth.
Four, description of drawings
Fig. 1-A is that potentiometry is crossed castinplace pile and drill center sectional view.
Fig. 1-B is that potential differentiation is crossed castinplace pile and drill center sectional view.The mark of each several part title is as follows among the figure:
The 1-A utmost point, the 2-B utmost point, the 3-M utmost point, the 4-N utmost point, 5-castinplace pile, 6-reinforcing cage, 7-electric logger, 8-lead, 9-depth encoder (pulley), 10-boring, 11-PVC pipe.
Fig. 2-A is the schematic diagram of No. 1 castinplace pile of diameter 1m, long 16m.
Fig. 2-B is the schematic diagram of No. 2 castinplace piles of diameter 1m, long 18.6m.
12-master's muscle 24 Φ 16HRB335 reinforcing bars; 13-spiral bar Φ 8; 14-reinforcing rib Φ 16.
Fig. 3 is the potential difference U that surveys in boring 1-1
MnWith the change in depth curve.
Fig. 4 is the potential difference U that surveys in boring 1-2
MnWith the change in depth curve.
Fig. 5 is the potential difference U that surveys in boring 2-1
MnWith the change in depth curve.
Five, the specific embodiment
Fig. 2-A is No. 1 castinplace pile (unit is mm among the figure) of diameter 1m, long 16m, and the situation of No. 1 castinplace pile sees Table 1.
Fig. 2-B is No. 2 castinplace piles (unit is mm among the figure) of diameter 1m, long 18.6m, and the situation of No. 2 castinplace piles sees Table 2.
No. 1 castinplace pile information slip of table 1
| The position | Stake is long | Length of reinforcing cage (m) in the stake | Reinforcing cage situation in the stake |
| Epimere | 8 | 8 | Main muscle (12) is the HRB335 reinforcing bar of 24 diameter of phi 16; Reinforcing rib (14) is the HRB335 reinforcing bar of diameter of phi 16, spacing 2m; Spiral bar (13) is the HPB235 reinforcing bar of diameter of phi 8, spacing 0.2m |
| Hypomere | 8 | 0 | Do not have reinforcing cage, form by concrete |
No. 2 castinplace pile information slips of table 2
| The position | Stake is long | Length of reinforcing cage (m) in the stake | Reinforcing cage situation in the stake |
| Epimere | 8 | 8 | Main muscle (12) is the HRB335 reinforcing bar of 24 diameter of phi 16; Reinforcing rib (14) is the HRB335 reinforcing bar of diameter of phi 16, spacing 2m; Spiral bar (13) is the HPB235 reinforcing bar of diameter of phi 8, spacing 0.2m |
| The stage casing | 8 | 8 | Main muscle (12) is the HRB335 reinforcing bar of 16 diameter of phi 16; Reinforcing rib (14) is the HRB335 reinforcing bar of diameter of phi 16, spacing 2m; Spiral bar (13) is the HPB235 reinforcing bar of diameter of phi 8, spacing 0.2m |
| Hypomere | 2.6 | 0 | Do not have reinforcing cage, form by concrete |
Drill through boring (a 10) 1-1 and a 1-2 who is parallel to castinplace pile (5) respectively at No. 1 castinplace pile (5) center, apart from 0.2m place, No. 1 castinplace pile (5) edge, hole depth is respectively 19m, 21m.Drilling through boring (a 10) 2-1 who is parallel to castinplace pile apart from 0.3m place, No. 2 castinplace piles (5) edge, hole depth is 21m.
The pvc pipe (11) of porose, internal diameter 0.07m, wall thickness 0.005m of band filter screen down in boring 1-1,1-2 and 2-1.Pvc pipe (11) top is with the castinplace pile top is parallel separately, and depth of setting equals hole depth separately.
By electric logger (7) the electrodes of A utmost point (1) is connected on certain root reinforcing bar of 1 or No. 2 castinplace pile (5) reinforcing cage (6), powers and the current electrode B utmost point (2) is placed on from pile center 100m place.
The measurement electrode M utmost point (3) put to the boring end, the measurement electrode N utmost point (4) be placed on, carry out U from the bottom up with the sampling interval of 0.5m apart from a stake 50m place
mMeasurement, wherein the M utmost point (3) is hung down a suspending weight body, is beneficial to the M utmost point (3) transferring in boring, at the bottom of the suspending weight body apart from the M utmost point (3) 0.7m; Apart from putting for the measurement electrode group M utmost point (3) of 0.26m and the N utmost point (4) to holing at the end, also the sampling interval with 0.5m carries out U from the bottom up fixed pole
MnMeasurement, wherein hang a suspending weight body under the electrode group, be beneficial to electrode group transferring in boring, at the bottom of the suspending weight body apart from measurement electrode---M, N utmost point central point 0.6m.
Measured value U
m, U
MnPlot the curve with change in depth, sudden change place of curve is the bottom interface of reinforcing cage (6), and reinforcing cage (6) length can obtain according to the scale on depth encoder (9) record or the measurement electrode lead (8).
Fig. 3 is the current potential U that surveys in boring 1-1
mWith the change in depth curve.
Fig. 4 is the current potential U that surveys in boring 1-2
mWith the change in depth curve.
Fig. 5 is the current potential U that surveys in boring 2-1
mWith the change in depth curve.
Fig. 6 is the potential difference U that surveys in boring 1-1
MnWith the change in depth curve.
Fig. 7 is the potential difference U that surveys in boring 1-2
MnWith the change in depth curve.
Fig. 8 is the potential difference U that surveys in boring 2-1
MnWith the change in depth curve.
Can find from Fig. 3: in degree of depth 0-8.3m scope, potential change is less; Below degree of depth 8.3m, potential change is also less; At the current potential U of degree of depth 8.3m place
mSudden change is arranged, illustrates that the 0-8.3m scope all has reinforcing cage (6) in No. 1 castinplace pile (5), length 8.3m, the bottom interface of reinforcing cage (6) is positioned at the 8.3m place, this with No. 1 castinplace pile (5) in the bottom interface 8m of actual reinforcing cage (6) conform to substantially (table 1).
Can find from Fig. 4: in degree of depth 0-8.3m scope, potential change is less; Below degree of depth 8.3m, potential change is also less; At the current potential U of 8.3m place
mSudden change is arranged, illustrates that the 0-8.3m scope all has reinforcing cage (6) in No. 1 castinplace pile (5), length 8.3m, the bottom interface of reinforcing cage (6) is positioned at the 8.3m place, this with No. 1 castinplace pile in the bottom interface 8m of actual reinforcing cage (6) conform to substantially (table 1).
Can find from Fig. 5: potential curve has two to undergo mutation, and a place is positioned at degree of depth 8.3m place, and another place is positioned at degree of depth 15.7m place.Illustrate in No. 2 castinplace piles (5) and in the 0-15.7m scope reinforcing cage (6) is arranged all, length 15.7m, the bottom interface of reinforcing cage (6) is positioned at the 15.7m place, but 8.3m place up and down number of steel bars changes, this with No. 2 castinplace piles in actual reinforcing cage (6) main muscle quantity begins to reduce and the 16m place is reinforcing cage (6) bottom interface conform to substantially (table 2) at the 8m place.
Can find from Fig. 6: in degree of depth 0-8.4m scope, potential difference changes less; Below degree of depth 8.4m, potential difference changes also less; At the potential difference U of degree of depth 8.4m place
MnSudden change is arranged, illustrates that the 0-8.4m scope all has reinforcing cage (6) in No. 1 castinplace pile (5), length 8.4m, the bottom interface of reinforcing cage (6) is positioned at the 8.4m place, this with No. 1 castinplace pile (5) in the bottom interface 8m of actual reinforcing cage (6) conform to substantially (table 1).
Can find from Fig. 7: in degree of depth 0-8.9m scope, potential difference changes less; Below degree of depth 8.9m, potential difference changes also less; At the potential difference U of 8.9m place
MnSudden change is arranged, illustrates that the 0-8.9m scope all has reinforcing cage (6) in No. 1 castinplace pile (5), length 8.9m, the bottom interface of reinforcing cage (6) is positioned at the 8.9m place, this with No. 1 castinplace pile in the bottom interface 8m of actual reinforcing cage (6) conform to substantially (table 1).
Can find from Fig. 8: in degree of depth 0-15.9m scope, potential difference changes less; Below degree of depth 15.9m, potential difference changes also less; At the potential difference U of 15.9m place
MnSudden change is arranged, illustrate that the 0-15.9m scope all has reinforcing cage (6) in No. 2 castinplace piles (5), length 15.9m, the bottom interface of reinforcing cage (6) is positioned at the 15.9m place, this conform to the bottom interface 16m of actual reinforcing cage (6) in No. 2 castinplace piles (table 2).
Claims (1)
1, a kind of method with length of reinforcing cage in the electrical logging detection cast-in-place concrete pile, its detection method step is as follows:
A, in castinplace pile (5) or apart from the castinplace pile edge≤one of 1m ground drill with ferrule is parallel to the boring (10) of castinplace pile (5), hole depth should be greater than the long 3m of castinplace pile (5), the external diameter 1cm of the electrode group that the aperture should be formed greater than the measurement electrode M utmost point (3) or the measurement electrode M utmost point (3), the N utmost point (4);
B, down with the porose pvc pipe of filter screen (11);
C, the A utmost point (1) being connected on certain root reinforcing bar of reinforcing cage (6) by electric logging meter (7), the B utmost point (2) is placed on 〉=and the long place of 5 times of castinplace piles (5) powers;
D, put into the measurement electrode M utmost point (3) in (10), and place the measurement electrode N utmost point (4) ground to avoid exchanging a certain position of interference in boring; Or the M utmost point (3), the N utmost point (4) are formed fixed pole apart from putting into boring (10) for the electrode group of 0.05m-0.5m;
E, the M utmost point (3) is linked to each other with electric logger (7) by depth encoder (9), the N utmost point (4) is also linked to each other with electric logger (7); Or the M utmost point (3) all passes through depth encoder (9) with the N utmost point (4) and links to each other with electric logger (7);
F, from boring (10), carry out the measurement of current potential Um or potential difference Umn from top to bottom or from the bottom up with the sampling interval of 10-50cm;
G, measured value is plotted curve with change in depth, sudden change place of curve, be the bottom interface of reinforcing cage (6), and deep calibration is read on the lead (8) that reinforcing cage (6) length can link to each other according to depth encoder (9) record or by the electrode group of forming with the measurement electrode M utmost point (3) or the measurement electrode M utmost point (3), the N utmost point (4) in the boring (10).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100387522A CN100519959C (en) | 2006-03-10 | 2006-03-10 | Method for detecting reinforcing bar cage length of concrete pouring pile by electric logging method |
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|---|---|---|---|
| CNB2006100387522A CN100519959C (en) | 2006-03-10 | 2006-03-10 | Method for detecting reinforcing bar cage length of concrete pouring pile by electric logging method |
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| Publication Number | Publication Date |
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| CN1818234A true CN1818234A (en) | 2006-08-16 |
| CN100519959C CN100519959C (en) | 2009-07-29 |
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| CN102061780B (en) * | 2009-09-11 | 2012-05-30 | 虞建放 | Steel plate concrete column and construction method |
| CN102168943A (en) * | 2010-12-21 | 2011-08-31 | 北京中研国辰测控技术有限公司 | Method for detecting embedment depth of ferromagnetic tubes/rods |
| CN110029668A (en) * | 2019-04-30 | 2019-07-19 | 中国科学院武汉岩土力学研究所 | Convenient for the PHC tubular pole and its test method of the long measurement of stake after work |
| CN110029668B (en) * | 2019-04-30 | 2022-07-26 | 中国科学院武汉岩土力学研究所 | PHC pipe pile convenient for measuring post-construction pile length and testing method thereof |
| CN111522066A (en) * | 2020-05-08 | 2020-08-11 | 上海应用技术大学 | Pile body quality electrical method detection method |
| CN115436431A (en) * | 2022-09-02 | 2022-12-06 | 江苏海洋大学 | Foundation pile detection method and system |
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| CN100519959C (en) | 2009-07-29 |
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