CN101614518A - Method for measuring length of reinforcing cage of concrete poured pile by potentials - Google Patents
Method for measuring length of reinforcing cage of concrete poured pile by potentials Download PDFInfo
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- CN101614518A CN101614518A CN200910032647A CN200910032647A CN101614518A CN 101614518 A CN101614518 A CN 101614518A CN 200910032647 A CN200910032647 A CN 200910032647A CN 200910032647 A CN200910032647 A CN 200910032647A CN 101614518 A CN101614518 A CN 101614518A
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Abstract
The present invention relates to method for measuring length of reinforcing cage of concrete poured pile by potentials.Step comprises: 1) lay the Kong Jing that center line is parallel with the poured pile center line, and at this Kong Jingzhong some measurement points are set; 2) on the ground of the positive pole of measurement power supply and negative pole difference connecting reinforcement cage and steel reinforcement cage outer rim; 3) with the potential electrode connecting reinforcement cage on the potential measurement instrument, potential electrode link expander, expander is put into Kong Jingzhong by rope, the current potential V of its each measurement point of upper contact head point-to-point measurement
n, write down the pairing current potential V of each measurement point n
n, and draw out electric potential gradient curve H-V; 4), find out the hole depth H of this knee point place correspondence according to electric potential gradient curve H-V
nThereby, draw the physical length of steel reinforcement cage.Its advantage is: method is simple and feasible, and testing cost is low, and the quality supervision of being convenient to a large amount of building operation detects, and can stop shoddy engineering thus, the heavy life cost that significantly reduces the wasting of resources that produces owing to shoddy engineering even pay.
Description
Technical field
The present invention relates to the measuring technique in the building operation, relate in particular to method for measuring length of reinforcing cage of concrete poured pile by potentials.
Background technology
When the concrete poured pile was constructed, tend to occur following problems: 1) the steel reinforcement cage placement location not just crooked certain position of the borehole wall that is stuck in do not occur, and causes steel reinforcement cage can not descend designated depth at present; 2) in the embedded rock pile area of Rock Conditions more complicated, the poured pile well depth in each place differs, the length of corresponding stake different, should arrive the poured pile of correspondence in the corresponding well down during construction, but often owing to pursue speed simply in the construction, managerial confusion in addition, the placement of steel reinforcement cage is usually fastened one person's story upon another person, and the non-length of steel reinforcement cage that causes into behind the post is promptly short; 3) the minority builder is a unlawful profit-making, gives short weight when making steel reinforcement cage, and length of reinforcing cage does not reach designing requirement, causes down the stake degree of depth not reach requirement, has a strong impact on the quality of reinforced concrete pile.
Also do not have at present the method for simple possible to detect the concrete poured pile of having finished already its degree of depth of constructing and whether reach designing requirement.And the detection method of length of reinforcing cage of concrete poured columnar pile through of designing a kind of simple possible is very important to stopping shoddy engineering, because it was just strangled shoddy engineering cradle from the construction initial stage, can significantly reduce the huge resource wave that is brought after finishing by shoddy engineering thus, take very heavy life cost.
Summary of the invention
The objective of the invention is to overcome the deficiency of above-mentioned prior art, a kind of method for measuring length of reinforcing cage of concrete poured pile by potentials of simple possible is provided, it is achieved through the following technical solutions:
Comprise the steps:
1) in the position of distance poured pile outer rim 0.5m, lay the boring that center line is parallel with the poured pile center line, boring aperture 6～9cm, hole depth is steel reinforcement cage projected depth 3m at least downwards again, sidewall at this Kong Jing is provided with some measurement point n, the corresponding hole depth position H of each measurement point
n
2) do the measurement power supply with direct current or the AC power of 50～60V, the positive pole of this measurement power supply is connected on the described steel reinforcement cage, negative pole places apart from 5 times of steel reinforcement cage outer rims on the ground of length of reinforcing cage;
3) potential electrode on the potential measurement instrument is connected on the steel reinforcement cage on stake top, another potential electrode links to each other with contact on the expander, this expander is connected a rope end that is provided with scale, expander is put into the bottom of described Kong Jing by this rope, from bottom to top according to the measurement point point-to-point measurement that is provided with,, send electric signal then to expander at each measurement point, make described contact stretch to the hole wall of Kong Jing, record the current potential V of this measurement point n
n, perhaps the initial measurement point of aboveground end begins to end to the hole bottom from the hole with described expander by this rope, and the current potential of the described measurement point of point-to-point measurement writes down the pairing current potential V of each measurement point n from top to bottom
n, and according to the pairing hole of measurement point n well depth H
nDraw out electric potential gradient curve H-V;
4), find out the hole depth H of this knee point place correspondence according to electric potential gradient curve H-V
nThereby, draw the physical length of steel reinforcement cage.
Further design is, when having the weak soil layer around Kong Jing, at Kong Jingzhong pvc pipe is set, and the pvc pipe internal diameter is not less than 6cm, is provided with on tube wall and measures the some and corresponding measured hole of measurement point.
Further design is, when underground water table was dark, water filling in boring contacted so that potential electrode can have preferably with hole wall.
It is the characteristics of a good conductor that the present invention utilizes steel reinforcement cage integral body, supply with a burning voltage at tip position, make it to become an equipotential body and decay with the increase of distance current potential body distance, after the degree of depth measures the steel reinforcement cage bottom, the current potential difference descends suddenly, can accurately record length of reinforcing cage in view of the above, method is simple and feasible, testing cost is low, be convenient to detect in the face of the quality supervision of a large amount of building operation, shoddy engineering can be strangled in cradle thus, can significantly reduce thus finish by shoddy engineering after the wasting of resources that brings, the heavy cost that expense is very given one's life for.
Description of drawings
Synoptic diagram when Fig. 1 is the inventive method enforcement.
Fig. 2 is the synoptic diagram of potential electrode by contact contact hole wall.
Fig. 3, the 4th, (H-Z) curve that electric potential gradient distributes on the steel reinforcement cage.
Among the figure, the 1st, steel reinforcement cage, the 2nd, Kong Jing, 2a are hole walls, 3a, 3b are power leads, the 4th, the potential measurement instrument, 4a, 4b potential electrode, the 5th, pvc pipe, 5a are the measured holes on the pvc pipe wall, the 6th, rope, the 7th, expander.
Embodiment
Embodiment 1
Present embodiment is whether the length of reinforcing cage of finishing concrete poured pile construction is reached designing requirement and the quality supervision carried out detects.Type potential measurement instrument and M306580 type expander have been adopted in this test.DWJ-3A potential measurement instrument can demonstrate each measurement point potential value in real time, and can show along the Potential distribution curve of each measurement point on the well depth direction of hole, i.e. electric potential gradient distribution curve H-V.Power supply is the direct supply voltage of 140W, 40V, has the potential electrode reverse connecting protection, electric current is crossed and put defencive function.The depth survey precision set of this measurement is 5cm, and the projected depth of the steel reinforcement cage that architectural design side provides is 10m.
At first, bore a hole well 3 that center line is parallel with the poured pile center line, see also Fig. 1, boring aperture 6.5cm, hole depth 13.2m in the position of distance steel reinforcement cage 1 outer rim 0.5m.In this boring, according to measuring accuracy the measurement point of minimum spacing is set, promptly the spacing of measurement point is 5cm.Because of soil layer around the boring is soft,,, be that 6cm pvc pipe 5 places this boring 2 with an internal diameter for the protection boring well can not stop up because of the earth that caves in for preventing the hole of collapsing.According to above-mentioned measurement point, on the tube wall of pvc pipe, beat some measured hole 5as corresponding with measurement point.Measurement point can be uniform equally spacedly, also can different spacing ground uniform.The spacing point of the measurement that general hole is aboveground section can be suitably bigger, so not only can guarantee measuring accuracy but also can improve efficiency of measurement.In the present embodiment, the measurement point spacing more than the well depth 5m of hole is 10cm, and the following measurement point spacing of 5m is 5cm.The spacing setting of measured hole 5a on the pvc pipe is corresponding with the measurement point of Kong Jing.Owing to the underground water table of soil layer around the boring is darker, water filling in boring contacts so that potential electrode can have preferably with hole wall simultaneously.
Then with the positive pole of above-mentioned direct supply 2 by being connected on the steel reinforcement cage by power lead 3a, it is on the ground at L=50m place that negative pole places apart from steel reinforcement cage outer rim distance by power lead 3b, as ignores the resistance value of steel reinforcement cage, steel reinforcement cage at this moment is the equipotential body.A potential electrode of potential measurement instrument 4 is connected on the steel reinforcement cage at place, top by connecting line 4a, another potential electrode 4b links to each other with contact 7a on the expander 7 by connecting line 3b again.Expander connection 7 is connected the end of rope 6, and rope 6 is provided with scale.
During test expander 7 is connected the end of rope 6, sees also Fig. 2.This rope 6 is provided with the length scale.Expander 7 is inserted in the hole well 2.Make expander 7 to the landing of hole bottom, the scale reading on rope 6 is 13m at least.Upwards spurring rope 6 then tests, the degree of depth by scale reading on the rope 6 or the demonstration of potential measurement instrument, when the every measurement point of expander, send electric signal to it, contact 7a is stretched out, and touch the hole wall 2a of Kong Jing by the corresponding measured hole 5a on the pvc pipe 5, obtain the current potential V of this measurement point n
nWrite down the pairing current potential V of each measurement point n
n, and according to the pairing hole of measurement point n well depth H
nDraw electric potential gradient distribution curve H-V.Simultaneously, the potential measurement instrument also can be from bottom to top according to each the measurement point n of measurement point point-to-point measurement and the pairing current potential V that are provided with
n, record one by one, and draw out electric potential gradient distribution curve H-V, see also Fig. 3.
Originally because the bottom section of the hole well 5 that places of expander 7, in the bottom of poured pile steel reinforcement cage, it is almost nil that the contact 7a on it stretches out the current potential that touches hole wall.Along with expander 7 constantly moves up, when moving to a measurement point, the current potential that its upper contact head 7a detects becomes greatly suddenly, is 22mV, i.e. V
n≈ 21.8mV.Illustrate that contact 7a has entered the equipotential electric field of steel reinforcement cage, this measurement point is pairing hole depth H
nBe the steel reinforcement cage degree of depth of living in, the corresponding hole depth H of contact 7a
nBe the steel reinforcement cage degree of depth of living in.According to the electric potential gradient distribution curve H-V of potential measurement instrument 4, the origination point of this abrupt change (flex point) is n=205 at the 205th measurement point, and the pairing hole depth of this measurement point is 10.05m, i.e. H
205=10.05m.
Can learn thus, be that 10.05 measurement point magnetic field intensity has produced abrupt change in hole depth.Be about 10.05 so judge the physical length of the steel reinforcement cage of surveying, the steel reinforcement cage of this bored concrete pile adheres to specification.
Embodiment 2
Present embodiment also is whether the length of reinforcing cage of finishing concrete poured pile construction is reached designing requirement and the quality supervision carried out detects, and the steel reinforcement cage design length is 12m.Potential measurement instrument and expander same as the previously described embodiments have been adopted in this test, and measuring accuracy is set at 5cm.
At first bore the Kong Jing that center line is parallel with the poured pile center line, the aperture 9cm of Kong Jing, hole depth 15.1m in the position of distance poured pile outer rim 0.5m.The spacing of measurement point is 5cm.Soil layer is harder around the boring, does not need the pvc pipe of pegging graft at Kong Jingzhong.The measurement point of Kong Jing is provided with same as the previously described embodiments.
Test is that initial measurement point beginning to hole bottom is ended from the upper end of hole well 5.The pairing current potential V of each measurement point n of contact 7a from top to down point-to-point measurement on the expander 7
n, write down the pairing current potential V of each measurement point n
n, and according to the pairing hole of measurement point n well depth H
nDraw electric potential gradient distribution curve H-V.Simultaneously, 4 in potential measurement instrument is with measurement point n and pairing current potential V
nRecord one by one, and draw out magnetic field intensity gradient distribution curve H-V, see also Fig. 4.
The potential value of the corresponding hole wall 2a that contact 7a on the expander 7 records in the equipotential electric field of poured pile steel reinforcement cage is basic identical, is 22.0mV, i.e. V
n≈ 22.0mV.4b constantly moves down along with magnetic probe, when moving to a measurement point, and field strength values V
nSuddenly diminish, go to zero, its corresponding hole depth H
nBe the steel reinforcement cage degree of depth of living in.According to magnetic field intensity measuring instrument 4 and draw out electric potential gradient distribution curve H-V, the origination point of this abrupt change (flex point), at the 214th measurement point (n=214), corresponding hole depth is 10.70m, H
214=10.70m.
Can learn thus, be that the measurement point current potential of 10.7m has produced abrupt change in hole depth.Be about 10.7m so judge the physical length of the steel reinforcement cage of surveying, the steel reinforcement cage of this bored concrete pile does not meet the design length requirement.
Claims (3)
1. method for measuring length of reinforcing cage of concrete poured pile by potentials is characterized in that comprising the steps:
1) in the position of distance poured pile outer rim 0.5m, lay the boring that center line is parallel with the poured pile center line, boring aperture 6～9cm, hole depth is steel reinforcement cage projected depth 3m at least downwards again, sidewall at this Kong Jing is provided with some measurement point n, the corresponding hole depth position H of each measurement point
n
2) do the measurement power supply with direct current or the AC power of 50～60V, the positive pole of this measurement power supply is connected on the described steel reinforcement cage, negative pole places apart from 5 times of steel reinforcement cage outer rims on the ground of length of reinforcing cage;
3) potential electrode on the potential measurement instrument is connected on the steel reinforcement cage on stake top, another potential electrode links to each other with contact on the expander, this expander is connected a rope end that is provided with scale, expander is put into the bottom of described Kong Jing by this rope, from bottom to top according to the measurement point point-to-point measurement that is provided with,, send electric signal then to expander at each measurement point, make described contact stretch to the hole wall of Kong Jing, record the current potential V of this measurement point n
n, perhaps the initial measurement point of aboveground end begins to end to the hole bottom from the hole with described expander by this rope, and the current potential of the described measurement point of point-to-point measurement writes down the pairing current potential V of each measurement point n from top to bottom
n, and according to the pairing hole of measurement point n well depth H
nDraw out magnetic field intensity gradient distribution curve H-Z;
4), find out the hole depth H of this knee point place correspondence according to electric potential gradient curve H-V
nThereby, draw the physical length of steel reinforcement cage.
2. method for measuring length of reinforcing cage of concrete poured pile by potentials according to claim 1, when it is characterized in that around Kong Jing, having the weak soil layer, at Kong Jingzhong pvc pipe is set, the pvc pipe internal diameter is not less than 6cm, is provided with to measure the some and corresponding measured hole of measurement point on tube wall.
3. the method for measuring length of reinforcing cage of concrete poured pile by potentials of stating according to claim 1 is characterized in that water filling in boring contacts so that electrode can have preferably with hole wall when underground water table is dark.
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| CN200910032647A CN101614518A (en) | 2009-06-30 | 2009-06-30 | Method for measuring length of reinforcing cage of concrete poured pile by potentials |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103015971A (en) * | 2012-12-12 | 2013-04-03 | 江苏方建工程质量鉴定检测有限公司 | Underground earth potential measuring method and electrode |
| CN106948387A (en) * | 2017-04-17 | 2017-07-14 | 中国电建集团贵阳勘测设计研究院有限公司 | A kind of method and device for having run bridge pile foundation length detection |
| CN108445074A (en) * | 2018-02-05 | 2018-08-24 | 浙江大学宁波理工学院 | The verifying attachment and method of distress in concrete repairing effect |
-
2009
- 2009-06-30 CN CN200910032647A patent/CN101614518A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103015971A (en) * | 2012-12-12 | 2013-04-03 | 江苏方建工程质量鉴定检测有限公司 | Underground earth potential measuring method and electrode |
| CN106948387A (en) * | 2017-04-17 | 2017-07-14 | 中国电建集团贵阳勘测设计研究院有限公司 | A kind of method and device for having run bridge pile foundation length detection |
| CN108445074A (en) * | 2018-02-05 | 2018-08-24 | 浙江大学宁波理工学院 | The verifying attachment and method of distress in concrete repairing effect |
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Open date: 20091230 |