CN1818717A - 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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- CN1818717A CN1818717A CN 200610038753 CN200610038753A CN1818717A CN 1818717 A CN1818717 A CN 1818717A CN 200610038753 CN200610038753 CN 200610038753 CN 200610038753 A CN200610038753 A CN 200610038753A CN 1818717 A CN1818717 A CN 1818717A
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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 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 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 bored concrete pile (6) center or apart from the bored concrete pile edge≤one of 1m ground drill with ferrule is parallel to the instrument connection (3) of bored concrete pile (6), hole depth should be greater than steel reinforcement cage (7) 3m, the aperture should be greater than (1) external diameter 1cm of the probe of magnetic well logging instrument (5);
B, 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, hole depth and aperture are with aforementioned instrument connection (3);
C, respectively at instrument connection (3), pvc pipe (2) down in hole (9) relatively;
D, the probe of magnetic well logging instrument (5) (1) is put into instrument connection (3) earlier, carry out the measurement of X, Y, three direction magnetic induction density of Z or magnetic susceptibility from the bottom up or from top to bottom with the sampling interval of 10-50cm, to pop one's head in again behind to be tested the finishing (1) put into comparison hole (9), with instrument connection (3) in identical sampling interval and method test;
E, wherein Z direction magnetic induction density is vertical direction magnetic induction density,
Be horizontal direction magnetic induction density,
Be total magnetic induction density;
F, vertical direction, horizontal direction and total magnetic induction density or magnetic susceptibility plot the curve with change in depth, then magnetic induction density or magnetic susceptibility sudden change place are number of steel bars variation place in the steel reinforcement cage (7), wherein the bottom boundary of steel reinforcement cage (7) is sudden change place that magnetic induction density becomes the regional background geomagnetic field intensity, and the variation characteristic of the variation characteristic of magnetic susceptibility and magnetic induction density roughly the same, that is to say that sudden change place of magnetic susceptibility is the bottom boundary of number of steel bars variation place and steel reinforcement cage (7), the interface location that number of steel bars changes can or be gone up deep calibration by the lead (8) that links to each other with probe (1) in the instrument connection (3) and read with steel reinforcement cage (7) length according to depth encoder (4) record.
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, the 2-PVC pipe, the 3-instrument connection, 4-depth encoder (pulley), 5-magnetic well logging method instrument, the 6-bored concrete pile, the 7-steel reinforcement cage, the 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-master's muscle 24 Φ 16; 11-spiral bar Φ 8; 12-reinforcement Φ 16
Fig. 3 is that the vertical direction magnetic induction density (Z) of surveying in instrument connection 1-1, horizontal direction magnetic induction density (H), total magnetic induction density (M) are with the change in depth curve.
Fig. 4 is that the vertical direction magnetic induction density (Z) of surveying in instrument connection 1-2, horizontal direction magnetic induction density (H), total magnetic induction density (M) are with the change in depth curve.
Fig. 5 is that the vertical direction magnetic induction density (Z) of surveying in instrument connection 2-1, horizontal direction magnetic induction density (H), 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) of surveying in hole 3-1 relatively, horizontal direction intensity (H), total intensity (M) are 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 instrument connection (a 3) 1-1 and a 1-2 who 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 instrument connection (a 3) 2-1 who 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 comparison hole (a 9) 3-1 who 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 the 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 the 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 the 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 of 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 is that the magnetic susceptibility of surveying in instrument connection 2-1 is with the change in depth curve.
Fig. 8 is that the magnetic susceptibility of surveying 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 the 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, its step is as follows:
A, at bored concrete pile (6) center or apart from the bored concrete pile edge≤one of 1m ground drill with ferrule is parallel to the instrument connection (3) of bored concrete pile (6), hole depth should be greater than steel reinforcement cage (7) 3m, the aperture should be greater than the external diameter 1cm of the probe (1) of magnetic well logging instrument (5);
B, 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, hole depth and aperture are with aforementioned instrument connection (3);
C, respectively at instrument connection (3), pvc pipe (2) down in hole (9) relatively;
D, the probe of magnetic well logging instrument (5) (1) is put into instrument connection (3) earlier, carry out the measurement of X, Y, three direction magnetic induction density of Z or magnetic susceptibility from the bottom up or from top to bottom with the sampling interval of 10-50cm, to pop one's head in again behind to be tested the finishing (1) put into comparison hole (9), with instrument connection (3) in identical sampling interval and method test;
E, wherein Z direction magnetic induction density is vertical direction magnetic induction density,
Be horizontal direction magnetic induction density,
Be total magnetic induction density;
F, vertical direction, horizontal direction and total magnetic induction density or magnetic susceptibility plot the curve with change in depth, then magnetic induction density or magnetic susceptibility sudden change place are number of steel bars variation place in the steel reinforcement cage (7), wherein the bottom boundary of steel reinforcement cage (7) is sudden change place that magnetic induction density becomes the regional background geomagnetic field intensity, and the variation characteristic of the variation characteristic of magnetic susceptibility and magnetic induction density roughly the same, sudden change place that is to say magnetic susceptibility is variation place of number of steel bars and the bottom boundary of steel reinforcement cage (7), and the interface location that number of steel bars changes can or be gone up deep calibration by the lead (8) that links to each other with probe (1) in the instrument connection (3) and read with steel reinforcement cage (7) length according to depth encoder (4) record.
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| CN102635129A (en) * | 2012-04-11 | 2012-08-15 | 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 |
| CN106054259A (en) * | 2016-07-05 | 2016-10-26 | 江苏方建质量鉴定检测有限公司 | Method for detecting broken points of wall reinforcements |
| 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 |
| 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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| 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 |
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Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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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| CN102635129A (en) * | 2012-04-11 | 2012-08-15 | 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 |
| 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 |
| CN106054259A (en) * | 2016-07-05 | 2016-10-26 | 江苏方建质量鉴定检测有限公司 | Method for detecting broken points of wall reinforcements |
| 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 |
| 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 |
| CN109884179A (en) * | 2019-04-10 | 2019-06-14 | 中国水利水电科学研究院 | A kind of detection method and device of Prestressed concrete cylinder pipe state |
| CN110261915A (en) * | 2019-06-14 | 2019-09-20 | 北京海创高科科技有限公司 | A kind of armored concrete bar construction scan 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 |
| CN112709267A (en) * | 2020-12-28 | 2021-04-27 | 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 |
| 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 |
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