CN1851157A - Method for detecting reinforcing steel longth of concrete bored pile wsing potential difference meter - Google Patents
Method for detecting reinforcing steel longth of concrete bored pile wsing potential difference meter Download PDFInfo
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- CN1851157A CN1851157A CN200610038754.1A CN200610038754A CN1851157A CN 1851157 A CN1851157 A CN 1851157A CN 200610038754 A CN200610038754 A CN 200610038754A CN 1851157 A CN1851157 A CN 1851157A
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- utmost point
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- reinforcing cage
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 229910001294 Reinforcing steel Inorganic materials 0.000 title abstract 6
- 230000003014 reinforcing effect Effects 0.000 claims description 57
- 238000005259 measurement Methods 0.000 claims description 29
- 238000001514 detection method Methods 0.000 claims description 8
- 238000005070 sampling Methods 0.000 claims description 4
- 238000005553 drilling Methods 0.000 abstract description 4
- 230000000007 visual effect Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 210000003205 muscle Anatomy 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 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
- 238000010586 diagram Methods 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
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000004313 potentiometry Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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Abstract
The invention discloses a method for detecting the length of a reinforcing steel bar cage in poured pile by potential difference meter, drilling a hole parallel with the poured pile in or by the molded poured pipe, detecting the potential or potential difference in the hole depth direction on the condition that the reinforcing steel bar cage is electrified, and finally determining the length of the cage according to the variation of the potential or potential difference in the hole depth direction. And it uses the electric difference between reinforcing steel bars and concrete in the detected object-reinforcing steel bar cage to detect the length of the reinforcing steel bar cage, having characters of clear and reliable principle, easy to spread, low detecting cost, and convenient, visual and simple to process tested data.
Description
One, technical field
The present invention relates to the building foundation detection technique, specifically be exactly to measure current potential U along the drilling depth direction by potential difference meter (as universal meter)
mOr potential difference U
Mn, judge the method for length of reinforcing cage in the castinplace pile then according to current potential or potential difference curve.
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 potential difference meter (as universal meter) (7) test to reinforcing cage (6) charge condition lower edge boring (10) depth direction current potential or potential difference, judge the method for reinforcing cage (6) length then by current potential or potential difference along the variation of boring (10) depth direction.Its principle is as follows: castinplace pile is made up of two kinds of different medium one reinforcing bar and concrete of electrical property feature, coagulation penus high resistance class medium wherein, and reinforcing bar belongs to good conductor, both electrical property differences are bigger.
The A level (anode) (1) of drawing with battery or dry cell batteries is connected on the reinforcing bar that ground exposes, and the current electrode B utmost point (negative electrode) (2) is placed (suitable 〉=5 times stake is long) beyond the certain distance.When the earth is powered, between two electrodes, produce electric field,, judge reinforcing cage (6) length in view of the above by the variation that potential difference meter (as universal meter) (7) is measured current potential, potential difference in the electric field.Before detecting earlier in castinplace pile (5) or apart from the place of castinplace pile (5) edge≤1m drill through be parallel to castinplace pile 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), and extremely go up by just (+) that lead (8) is connected potential difference meter (as universal meter) (7), the N utmost point (4) is placed on ground certain position (disturbing but should avoid exchanging), and extremely go up by negative (-) that lead (8) is connected potential difference meter (as universal meter) (7), measure 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 M, the N utmost point is advisable with 0.05m-0.5m) simultaneously, and just (+) utmost point that is connected to potential difference meter (as universal meter) (7) by lead (8) is extremely gone up the potential difference U of measurement edge boring (10) direction different depth with negative (-)
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 reinforcing cage is arranged (6) and no-reinforcing-bar cage interface, significant change will take place in current potential or potential difference, and along with away from reinforcing cage (6), it is relatively stable that its current potential or potential difference are tending towards again.Utilize the variation characteristic of current potential or potential difference can determine the length of reinforcing cage (6) in the castinplace pile (5) 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 potential difference meter detection cast-in-place concrete pile, its 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 is formed greater than the measurement electrode M utmost point (3) or the measurement electrode M utmost point (3), the N utmost point (4);
B, adopting battery or dry cell batteries to draw A level (anode) (1) and the B utmost point (negative electrode) (2), and the A utmost point (1) is connected on certain root reinforcing bar of reinforcing cage (6), the B utmost point (2) is placed on 〉=and spacing that 5 times of castinplace piles (5) are grown powers in addition;
C, put into the measurement electrode M utmost point (3) in (10) in boring, and place the measurement electrode N utmost point (4) ground to avoid exchanging a certain position ground connection of interference, wherein the M utmost point (3) links to each other by depth encoder (9) and potential difference meter (7) are anodal, and the N utmost point links to each other with potential difference meter (7) negative pole; Or M, the N utmost point form fixed pole and put into boring (10) apart from the electrode group of (0.05m-0.5m), and the M utmost point (3), the N utmost point (4) all pass through just (+) utmost point that depth encoder (9) is connected to potential difference meter (7), bear (-) extremely goes up;
D, 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;
E, 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 potential difference meter (as universal meter) 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, this method 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-potential difference meter (as universal meter), 8-lead, 9-depth encoder (pulley), 10-boring.
Fig. 2 is the castinplace pile of diameter 1m, long 16m and the schematic diagram of reinforcing cage.
11-master's muscle 24 Φ 16HRB335 reinforcing bars; 12-reinforcing rib Φ 16; 13-spiral bar Φ 8.
Fig. 3 is the current potential U of actual measurement in boring 1
mWith the change in depth curve.
Fig. 4 is the current potential U of actual measurement in boring 2
mWith the change in depth curve.
Five, the specific embodiment
Fig. 2 is the castinplace pile (unit is mm among the figure) of diameter 1m, long 16m, and the situation of castinplace pile sees Table 1.
Table 1 castinplace pile information slip
| The position | Stake is long | Length of reinforcing cage (m) in the stake | Reinforcing cage situation in the stake |
| Epimere | 8 | 8 | Main muscle (11) is the HRB335 reinforcing bar of 24 diameter of phi 16; Reinforcing rib (12) is the HRB335 reinforcing bar of diameter of phi 16, spacing 2m; Spiral bar (13) is the HPB235 reinforcing bar of diameter of |
| Hypomere | |||
| 8 | 0 | Do not have reinforcing cage, form by concrete |
Drill through a boring (10) 1 and 2 that is parallel to castinplace pile (5) respectively at castinplace pile (5) center with apart from 0.2m place, castinplace pile edge, hole depth is respectively 18m, 20m.
Anode (the A utmost point) (1) with the 90v dry cell batteries is connected on certain root reinforcing bar of filling pile cage of reinforcement (6), and negative electrode (the B utmost point) (2) places identity distance stake 100m place, ground to power.
The short iron block of the column of band lead (8) is put to (10) 1,2 ends of boring as the measurement electrode M utmost point (3), the M utmost point (3) is connected the positive pole of universal meter (7) by lead (8), the measurement electrode N utmost point (4) is placed on apart from stake 50m place, and be connected the negative pole of universal meter (7) by lead (8), carry out U from the bottom up with the sampling interval of 0.5m
mMeasurement; Connect P
3The A section
Apart from putting for the measurement electrode group M utmost point (3) of 0.3m 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, the M utmost point (3), the N utmost point (4) all pass through just (+) utmost point that depth encoder (9) is connected to potential difference meter (as universal meter) (7), negative (-) extremely goes up.
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 of actual measurement in boring 1
mWith the change in depth curve.
Fig. 4 is the current potential U of actual measurement in boring 2
mWith the change in depth curve.
Fig. 5 is the potential difference U of actual measurement in boring 1
MnWith the change in depth curve.
Fig. 6 is the potential difference U of actual measurement in boring 2
MnWith the change in depth curve.
Can find from Fig. 3: in degree of depth 0-7.5m scope, potential change is less; Below degree of depth 7.5m, potential change is also less; At the current potential U of degree of depth 7.5m place
mSudden change is arranged, illustrates that the 0-7.5m scope all has reinforcing cage (6) in the castinplace pile (5), length 7.5m, the bottom interface of reinforcing cage (6) is positioned at the 7.5m place, this with 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 0-7.5m scope, potential change is less; Below degree of depth 7.5m, potential change is also less; At the current potential U of 7.5m place
mSudden change is arranged, illustrates that the 0-7.5m scope all has reinforcing cage (6) in the castinplace pile, length 7.5m, the bottom interface of reinforcing cage is positioned at the 7.5m place, this with castinplace pile (5) in the bottom interface 8m of actual reinforcing cage (6) conform to substantially (table 1).
Can find from Fig. 5: in degree of depth 0-8m scope, potential difference changes less; Below degree of depth 8m, potential difference changes also less; At the potential difference U of degree of depth 8m place
MnSudden change is arranged, illustrate that the 0-8m scope all has reinforcing cage (6) in the castinplace pile (5), length 8m, the bottom interface of reinforcing cage (6) is positioned at the 8m place, this conform to the bottom interface 8m of actual reinforcing cage (6) in the castinplace pile (5) (table 1).
Can find from Fig. 6: in the degree of depth 0 9m scope, potential difference changes less; Below degree of depth 9m, potential difference changes also less; At the potential difference U of 9m place
MnSudden change is arranged, illustrates that the 0-9m scope all has reinforcing cage (6) in the castinplace pile, length 9m, the bottom interface of reinforcing cage is positioned at the 9m place, this with castinplace pile (5) in the bottom interface 8m of actual reinforcing cage (6) conform to substantially (table 1).
Claims (1)
1, a kind of method with length of reinforcing cage in the potential difference meter detection cast-in-place concrete pile, its 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 is formed greater than the measurement electrode M utmost point (3) or the measurement electrode M utmost point (3), the N utmost point (4);
B, adopting battery or dry cell batteries to draw A level (anode) (1) and the B utmost point (negative electrode) (2), and the A utmost point (1) is connected on certain root reinforcing bar of reinforcing cage (6), the B utmost point (2) is placed on 〉=and distance that 5 times of castinplace piles (5) are grown powers in addition;
C, put into the measurement electrode M utmost point (3) in (10) in boring, and place the measurement electrode N utmost point (4) ground to avoid exchanging a certain position ground connection of interference, wherein the M utmost point (3) links to each other by depth encoder (9) and potential difference meter (7) are anodal, and the N utmost point links to each other with potential difference meter (7) negative pole; Or M, the N utmost point form fixed pole and put into boring (10) apart from the electrode group of (0.05m-0.5m), and the M utmost point (3), the N utmost point (4) all pass through just (+) utmost point that depth encoder (9) is connected to potential difference meter (7), bear (-) extremely goes up;
D, 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;
E, 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 |
|---|---|---|---|
| CN200610038754.1A CN1851157A (en) | 2006-06-14 | 2006-06-14 | Method for detecting reinforcing steel longth of concrete bored pile wsing potential difference meter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106436715A (en) * | 2016-10-14 | 2017-02-22 | 荆门创佳机械科技有限公司 | Device capable of monitoring concrete pouring speed and height of cast-in-place concrete pile |
-
2006
- 2006-06-14 CN CN200610038754.1A patent/CN1851157A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106436715A (en) * | 2016-10-14 | 2017-02-22 | 荆门创佳机械科技有限公司 | Device capable of monitoring concrete pouring speed and height of cast-in-place concrete pile |
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