CN100489560C - Method for detecting reinforcing bar cage length in concrete pouring pile by magnetic logging method - Google Patents
Method for detecting reinforcing bar cage length in concrete pouring pile by magnetic logging method Download PDFInfo
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- 230000005291 magnetic effect Effects 0.000 title claims abstract description 111
- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000003014 reinforcing effect Effects 0.000 title claims description 28
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 68
- 239000010959 steel Substances 0.000 claims abstract description 68
- 230000006698 induction Effects 0.000 claims abstract description 56
- 238000012360 testing method Methods 0.000 claims abstract description 4
- 230000002787 reinforcement Effects 0.000 claims description 54
- 238000005259 measurement Methods 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 9
- 230000005358 geomagnetic field Effects 0.000 claims description 9
- 210000003205 muscle Anatomy 0.000 claims description 8
- 239000000523 sample Substances 0.000 claims description 8
- 238000005070 sampling Methods 0.000 claims description 6
- 238000005553 drilling Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- 230000005415 magnetization Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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Abstract
A method for measuring length of steel bar case in bored concrete pile by magnetic well logging means includes drilling a hole on center of formed-bored concrete pile, utilizing instrument of well logging means to test magnetic induction intensity along drilled hole, judging out length of steel bar cage and quantity variation boundary of steel bar according to magnetic induction intensity variation along depth direction of drilled hole.
Description
One, technical field
The present invention relates to the building foundation detection technique, specifically be exactly to judge that by magnetic induction density in the magnetic well logging method or susceptibility curve number of steel bars in the cast-in-place concrete pile changes the method for interface and length of reinforcing cage.
Two, background technology
Bored concrete 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, overpass, life and production house with civil building.Because of concealed work under the bored concrete 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 buildings.
At present, bored concrete pile integrity detection and bearing capacity detect oneself 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 inherent vice that the transient electromagnetic induction well logging method is surveyed the concrete-pile steel reinforcement 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 the lossless detection method that number of steel bars in a kind of new bored concrete pile changes interface and length of reinforcing cage.
2, technical scheme
The present invention is by bore the hole (3) that is parallel to bored concrete pile in type bored concrete pile (6) center or by the stake, utilize magnetic induction density or the magnetic susceptibility of existing magnetic well logging method instrument (5) test, judge that along the variation of drilling depth direction number of steel bars changes the method for interface and steel reinforcement cage (7) length according to magnetic induction density or magnetic susceptibility along boring (3) depth direction.Its principle is as follows: reinforcing bar belongs to ferromagnetic material, will produce magnetic anomaly on the background of former magnetic field normally owing to magnetization in the terrestrial magnetic field, and the reinforcing bar content in the steel reinforcement cage is high more, and magnetic anomaly is put up with big more in certain distance.
Before detecting earlier at bored concrete pile (6) center or apart from bored concrete pile edge≤1m place drill through be parallel to bored concrete pile instrument connection (3) one to two, hole depth should be greater than estimating or design steel reinforcement cage (7) length 3m.By magnetic well logging method instrument (5) probe (1) is placed in the instrument connection (3), measures magnetic induction density or magnetic susceptibility along instrument connection direction different depth.Obviously, when in the bored concrete pile (6) steel reinforcement cage (7) being arranged, magnetic induction density in the instrument connection (3) equals the stack of the magnetic anomaly that regional background geomagnetic field intensity and steel reinforcement cage (7) cause itself, and magnetic susceptibility equals the ratio of the magnetization and magnetizing field strength (regional background earth magnetism mill intensity); When number of steel bars in the bored concrete pile changes, magnetic induction density in the instrument connection or magnetic susceptibility also will change.Utilize the variation characteristic of magnetic induction density or magnetic susceptibility can determine comparatively exactly that number of steel bars in the steel reinforcement cage changes the length of interface and steel reinforcement cage (7), the wherein bottom boundary of steel reinforcement cage (7) sudden change place that becomes the regional background geomagnetic field intensity for the magnetic induction density that records along instrument connection (3) or magnetic susceptibility, and the above-mentioned variation characteristic of the variation characteristic of magnetic susceptibility and magnetic induction density is similar.For obtaining the regional background geomagnetic field intensity, improve the degree of accuracy that detects, can be parallel to the comparison hole (9) of bored concrete pile at one of the ground drill with ferrule of distance bored concrete pile (6) edge 〉=3m, hole depth equals the instrument connection hole depth.
A kind of method with length of reinforcing cage in the magnetic well logging method detection cast-in-place concrete pile, its step is as follows:
A, at first make the bored concrete pile that diameter is 1m, long 16-18.2m (6), the length of steel reinforcement cage (7) is 8-16m in the stake, and wherein steel reinforcement cage (7) is made by main muscle (10), spiral bar (11) and reinforcement (12);
Secondly B, drill through (3) one of instrument connections that are parallel to bored concrete pile at the center of bored concrete pile (6) or apart from bored concrete pile edge≤1m place, hole depth should be greater than steel reinforcement cage (7) length 3m, and the aperture should be greater than the external diameter 1cm of the probe (1) of magnetic well logging instrument (5);
C, be parallel to the comparison hole (9) of bored concrete pile (6) at one of the ground drill with ferrule of distance bored concrete pile (6) edge 〉=3m then, hole depth and aperture are with aforementioned instrument connection (3);
D, respectively in instrument connection (3), pvc pipe (2) down in hole (9) relatively, the same hole depth of pipe range;
E, the probe (1) of magnetic well logging method instrument (5) is put into instrument connection (3) earlier, sampling interval with 10-50cm up or from last carries out X at the bottom of the hole at the bottom of the hole, Y, the measurement of three direction magnetic induction density of Z or magnetic susceptibility, to pop one's head in again behind to be tested the finishing (1) move and put into comparison hole (9), with with instrument connection (3) in identical sampling interval and method test, record regional background terrestrial magnetic field X, Y, the magnetic induction density or the magnetic susceptibility of three directions of Z, wherein Z direction magnetic induction density is vertical direction magnetic induction density
Be horizontal direction magnetic induction density,
Be total magnetic induction density;
F, respectively instrument connection (3) and hole (9) vertical direction Z of recording relatively, horizontal direction H and total magnetic induction density M or magnetic susceptibility plot the curve with change in depth, compare then, when not having steel reinforcement cage in the bored concrete pile (6), by instrument connection (3) and hole (9) magnetic induction density of recording or magnetic susceptibility no change almost relatively, when in the bored concrete pile (6) steel reinforcement cage being arranged, the magnetic induction density or the magnetic susceptibility that record in instrument connection (3) and the comparison hole (9) have significant change, when the length of bored concrete pile (6) is respectively 16m and 18.6m, when the length of steel reinforcement cage (7) is respectively 8m and 16m in the stake, X in instrument connection (3), Y, the magnetic induction density of three directions of Z or magnetic susceptibility are with the curve of change in depth, at 8.5m and 16.5m place sudden change is arranged respectively, be variation place of number of steel bars in the steel reinforcement cage (7), and arrive the metastable relatively geomagnetic field intensity of the regional background of hole (9) in the magnetic induction density or the magnetic susceptibility variation that reach below the 8.5m below the 16.5m, therefore, the interface location that number of steel bars changes and the length of steel reinforcement cage are respectively 8.5m and 16.5m, these data also can be read from the scale of depth encoder (4) record or lead (8), and the data that this physical length with the middle steel reinforcement cage (7) of bored concrete pile (6) of made is respectively 8m and 16m conform to substantially.
3, beneficial effect
The present invention utilizes detected object---and reinforcing bar detects number of steel bars variation interface and length of reinforcing cage in the bored concrete pile because magnetization will produce magnetic anomaly in the steel reinforcement cage in the terrestrial magnetic field, and principle is clear reliable; Because of adopting conventional magnetic well logging method instrument 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 processing, so method is intuitively simple.In addition, the present invention also can be applicable to the detection of the old bridge base or the dam foundation degree of depth.
Four, description of drawings
Fig. 1 was bored concrete pile and instrument connection central cross-sectional view.The mark of each several part title is as follows among the figure:
1-magnetic well logging method instrument probe, 2-pvc pipe, 3-instrument connection, 4-depth encoder (pulley), 5-magnetic well logging method instrument, 6-bored concrete pile, 7-steel reinforcement cage, 8-lead, 9-is the hole relatively.
Fig. 2-A is the synoptic diagram of No. 1 bored concrete pile of diameter 1m, long 16m.
Fig. 2-B is the synoptic diagram of No. 2 bored concrete piles of diameter 1m, long 18.6m.
10-main muscle 24 Φ 16; 11-spiral bar Φ 8; 12-reinforcement Φ 16
Fig. 3 is that the vertical direction magnetic induction density (Z), horizontal direction magnetic induction density (H) of actual measurement in instrument connection 1-1, total magnetic induction density (M) are with the change in depth curve.
Fig. 4 is that the vertical direction magnetic induction density (Z), horizontal direction magnetic induction density (H) of actual measurement in instrument connection 1-2, total magnetic induction density (M) are with the change in depth curve.
Fig. 5 is that the vertical direction magnetic induction density (Z), horizontal direction magnetic induction density (H) of actual measurement in instrument connection 2-1, total magnetic induction density (M) are with the change in depth curve.
Fig. 6 is that the regional background terrestrial magnetic field vertical direction intensity (Z), horizontal direction intensity (H), total intensity (M) of actual measurement in hole 3-1 relatively is with the change in depth curve.
Five, embodiment
Fig. 2-A is No. 1 bored concrete pile (unit is mm among the figure) of diameter 1m, long 16m, and the situation of No. 1 bored concrete pile sees Table 1.
Fig. 2-B is No. 2 bored concrete piles (unit is mm among the figure) of diameter 1m, long 18.6m, and the situation of No. 2 bored concrete piles sees Table 2.
No. 1 bored concrete pile information slip of table 1
| The position | Stake is long | Length of reinforcing cage (m) in the stake | Steel reinforcement cage situation in the stake |
| Epimere | 8 | 8 | Main muscle (10) is the HRB335 reinforcing bar of 24 diameter of phi 16; Reinforcement (12) is the HRB335 reinforcing bar of diameter of phi 16, spacing 2m; Spiral bar (11) is the HPB235 reinforcing bar of diameter of phi 8, spacing 0.2m |
| Hypomere | 8 | 0 | Do not have steel reinforcement cage, form by concrete |
No. 2 bored concrete pile information slips of table 2
| The position | Stake is long | Length of reinforcing cage (m) in the stake | Steel reinforcement cage situation in the stake |
| Epimere | 8 | 8 | Main muscle (10) is the HRB335 reinforcing bar of 24 diameter of phi 16; Reinforcement (12) is the HRB335 reinforcing bar of diameter of phi 16, spacing 2m; Spiral bar (11) is the HPB235 reinforcing bar of diameter of phi 8, spacing 0.2m |
| The stage casing | 8 | 8 | Main muscle (10) is the HRB335 reinforcing bar of 16 diameter of phi 16; Reinforcement (12) is the HRB335 reinforcing bar of diameter of phi 16, spacing 2m; Spiral bar (11) is the HPB235 reinforcing bar of diameter of phi 8, spacing 0.2m |
| Hypomere | 2.6 | 0 | Do not have steel reinforcement cage, form by concrete |
Drill through an instrument connection (3) 1-1 and 1-2 that is parallel to bored concrete pile respectively at No. 1 bored concrete pile (6) center with apart from 0.2m place, No. 1 bored concrete pile edge, hole depth is respectively 19m, 21m; Drill through an instrument connection (3) 2-1 that is parallel to bored concrete pile apart from 0.3m place, No. 2 bored concrete piles (6) edge, hole depth is 21m; Distance 1, No. 2 bored concrete pile (6) 5m place drills through a comparison hole (9) 3-1 that is parallel to 1, No. 2 bored concrete pile (6), and hole depth is 21m.
The pvc pipe (2) of internal diameter 0.07m, wall thickness 0.005m under in instrument connection (3) 1-1,1-2,2-1 and comparison hole 3-1.Pvc pipe (2) top is with the bored concrete pile top is parallel separately, and setting depth equals hole depth separately.
At the bottom of the probe (1) of three-component magnetometer (1) in the well put into the hole, carry out the measurement of X, Y, three direction magnetic induction density of Z (unit is for receiving the nT of tesla) from the bottom up with the sampling interval of 0.5m.
The magnetic induction density of Z direction is vertical direction magnetic induction density, and horizontal direction and total magnetic induction density are respectively according to formula
Obtain.
Vertical direction, horizontal direction and total magnetic induction density are plotted curve with change in depth, sudden change place of magnetic induction density curve is number of steel bars variation place in the steel reinforcement cage, wherein the bottom boundary of steel reinforcement cage is sudden change place that magnetic induction density becomes the regional background geomagnetic field intensity, and interface location can obtain according to the scale on depth encoder (4) record or the lead (8).
Comparison diagram 3,6 can be found: at the 8.5m place, vertical direction, horizontal direction, total magnetic induction density have sudden change.Below 8.5m, magnetic induction density changes to metastable regional background geomagnetic field intensity.Illustrate that 0-8.5m scope all has steel reinforcement cage (7) in No. 1 bored concrete pile (6), the bottom boundary of steel reinforcement cage (7) is positioned at the 8.5m place, this with No. 1 bored concrete pile in actual length of reinforcing cage 8m conform to substantially (table 1).
Comparison diagram 4,6 can be found: at the 8.5m place, vertical direction, horizontal direction, total magnetic induction density have sudden change.Below 8.5m, magnetic induction density changes to metastable regional background geomagnetic field intensity again.Illustrate that 0-8.5m scope all has steel reinforcement cage (7) in No. 1 bored concrete pile (6), the bottom boundary of steel reinforcement cage (7) is positioned at the 8.5m place, this with No. 1 bored concrete pile in actual length of reinforcing cage 8m conform to substantially (table 1).
Comparison diagram 5,6 can be found: at the 8m place, vertical direction, total magnetic induction density have sudden change, judge that the 8m place has the variation of number of steel bars up and down; At the 16.5m place, vertical direction, horizontal direction, total magnetic induction density all have sudden change, and the following magnetic induction density of 16.5m changes to metastable regional background geomagnetic field intensity again.Illustrate in No. 2 bored concrete piles (6) and in 0-16.5m scope steel reinforcement cage is arranged all, 8m place number of steel bars up and down changes, the bottom boundary of steel reinforcement cage (7) is positioned at the 16.5m place, this with No. 2 bored concrete piles in actual steel reinforcement cage (7) main muscle quantity begins to reduce and 16m place is steel reinforcement cage (7) bottom boundary conform to substantially (table 2) at the 8m place.
The probe of magnetic susceptibility meter is put into respectively at the bottom of the hole in instrument connection 2-1, comparison hole 3-1, also carried out the measurement of magnetic susceptibility from the bottom up with the sampling interval of 0.5m.
Magnetic susceptibility is plotted curve with change in depth, sudden change place of susceptibility curve is number of steel bars variation place in the steel reinforcement cage, wherein the bottom boundary of steel reinforcement cage is that magnetic susceptibility begins to become and sudden change place of comparing the magnetic susceptibility same trend of being surveyed in the hole, and interface location can obtain according to the scale on depth encoder (4) record or the lead (8).
Fig. 7 be in instrument connection 2-1 actual measurement magnetic susceptibility with the change in depth curve.
Fig. 8 is that the magnetic susceptibility of actual measurement in hole 3-1 relatively is with the change in depth curve.
Comparison diagram 7,8 can be found: at the 8.5m place, magnetic susceptibility has sudden change, judges that the 8.5m place has the variation of number of steel bars up and down; Magnetic susceptibility also has sudden change at the 16.5m place, and 16.5m begins, and the variation tendency of magnetic susceptibility is with relatively the hole is identical.Illustrate in No. 2 bored concrete piles (6) and in 0-16.5m scope steel reinforcement cage is arranged all, 8.5m locating up and down, number of steel bars changes, the bottom boundary of steel reinforcement cage (7) is positioned at the 16.5m place, this with No. 2 bored concrete piles in actual steel reinforcement cage (7) main muscle quantity begins to reduce and 16m place is steel reinforcement cage (7) bottom boundary conform to substantially (table 2) at the 8m place.
Claims (1)
1, a kind of method with length of reinforcing cage in the magnetic well logging method detection cast-in-place concrete pile is characterized in that this method step is as follows:
A, at first make the bored concrete pile that diameter is 1m, long 16-18.2m (6), the length of steel reinforcement cage (7) is 8-16m in the stake, and wherein steel reinforcement cage (7) is made by main muscle (10), spiral bar (11) and reinforcement (12);
Secondly B, drill through (3) one of instrument connections that are parallel to bored concrete pile at the center of bored concrete pile (6) or apart from bored concrete pile edge≤1m place, hole depth should be greater than steel reinforcement cage (7) length 3m, and the aperture should be greater than the external diameter 1cm of the probe (1) of magnetic well logging instrument (5);
C, be parallel to the comparison hole (9) of bored concrete pile (6) at one of the ground drill with ferrule of distance bored concrete pile (6) edge 〉=3m then, hole depth and aperture are with aforementioned instrument connection (3);
D, respectively in instrument connection (3), pvc pipe (2) down in hole (9) relatively, the same hole depth of pipe range;
E, the probe (1) of magnetic well logging method instrument (5) is put into instrument connection (3) earlier, sampling interval with 10-50cm up or from last carries out X at the bottom of the hole at the bottom of the hole, Y, the measurement of three direction magnetic induction density of Z or magnetic susceptibility, to pop one's head in again behind to be tested the finishing (1) move and put into comparison hole (9), with with instrument connection (3) in identical sampling interval and method test, record regional background terrestrial magnetic field X, Y, the magnetic induction density or the magnetic susceptibility of three directions of Z, wherein Z direction magnetic induction density is vertical direction magnetic induction density
Be horizontal direction magnetic induction density,
Be total magnetic induction density;
F, respectively instrument connection (3) and hole (9) vertical direction Z of recording relatively, horizontal direction H and total magnetic induction density M or magnetic susceptibility plot the curve with change in depth, compare then, when not having steel reinforcement cage in the bored concrete pile (6), by instrument connection (3) and hole (9) magnetic induction density of recording or magnetic susceptibility no change almost relatively, when in the bored concrete pile (6) steel reinforcement cage being arranged, the magnetic induction density or the magnetic susceptibility that record in instrument connection (3) and the comparison hole (9) have significant change, when the length of bored concrete pile (6) is respectively 16m and 18.6m, when the length of steel reinforcement cage (7) is respectively 8m and 16m in the stake, X in instrument connection (3), Y, the magnetic induction density of three directions of Z or magnetic susceptibility are with the curve of change in depth, at 8.5m and 16.5m place sudden change is arranged respectively, be variation place of number of steel bars in the steel reinforcement cage (7), and arrive the metastable relatively geomagnetic field intensity of the regional background of hole (9) in the magnetic induction density or the magnetic susceptibility variation that reach below the 8.5m below the 16.5m, therefore, the interface location that number of steel bars changes and the length of steel reinforcement cage are respectively 8.5m and 16.5m, these data also can be read from the scale of depth encoder (4) record or lead (8), and the data that this physical length with the middle steel reinforcement cage (7) of bored concrete pile (6) of made is respectively 8m and 16m conform to substantially.
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| CN102635129B (en) * | 2012-04-11 | 2014-09-24 | 中冶交通工程技术有限公司 | Method for detecting steel reinforcement cage pre-buried under cast-in-place pile |
| CN105971031A (en) * | 2016-06-22 | 2016-09-28 | 昆山市建设工程质量检测中心 | Magnetic-induction-based pile length detection device for tubular pile construction and detection method |
| CN106054259B (en) * | 2016-07-05 | 2018-04-17 | 江苏方建质量鉴定检测有限公司 | A kind of wall steel bar breaking point detection method |
| CN106193136A (en) * | 2016-07-25 | 2016-12-07 | 上海宝冶集团有限公司 | Detection method based on electromagnetic field intensity test site filling pile cage of reinforcement length |
| CN108445074B (en) * | 2018-02-05 | 2021-12-28 | 浙江大学宁波理工学院 | Device and method for testing concrete crack repairing effect |
| CN109884179B (en) * | 2019-04-10 | 2021-04-23 | 中国水利水电科学研究院 | Method and device for detecting state of prestressed concrete cylinder pipe |
| CN110261915B (en) * | 2019-06-14 | 2021-02-05 | 北京海创高科科技有限公司 | Reinforced concrete reinforcement structure scanning method and scanner based on electromagnetic induction |
| CN110644540A (en) * | 2019-08-06 | 2020-01-03 | 广州市市政工程试验检测有限公司 | Device and method for detecting length of rock-socketed pile of existing building |
| CN112709267B (en) * | 2020-12-28 | 2022-07-05 | 上海建工二建集团有限公司 | System and construction method for detecting integrity of pile body of underwater cast-in-place pile |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE826125A (en) * | 1974-04-20 | 1975-06-16 | APPARATUS FOR LOCATING STEEL STUDS IN CONCRETE ROAD COATINGS AND FOR LOCATING STUDS ON THE COATING |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE826125A (en) * | 1974-04-20 | 1975-06-16 | APPARATUS FOR LOCATING STEEL STUDS IN CONCRETE ROAD COATINGS AND FOR LOCATING STUDS ON THE COATING |
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