CN101334368A - Steel tube centrifugal concrete pipe pile integrality endoscopic detection method - Google Patents
Steel tube centrifugal concrete pipe pile integrality endoscopic detection method Download PDFInfo
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- CN101334368A CN101334368A CNA2007100427736A CN200710042773A CN101334368A CN 101334368 A CN101334368 A CN 101334368A CN A2007100427736 A CNA2007100427736 A CN A2007100427736A CN 200710042773 A CN200710042773 A CN 200710042773A CN 101334368 A CN101334368 A CN 101334368A
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Abstract
The invention relates to a detecting method in geotechnical engineering and discloses an endoscopic detecting method of the integrity of a centrifugal concrete tubular pile of a steel pipe. The method of the invention comprises the following steps: a camera is suspended inside an orifice of the centrifugal concrete tubular pile of the steel pipe, wherein, the camera is connected with a computer through a waterproof cable, further connected with a scale string tape, and used for obtaining information inside the tubular pile orifice, displaying camera images on a computer screen, and storing the camera images inside a storage; the endoscopic camera images are processed so as to obtain information of underground water and concrete core as well as information of concrete surface quality inside the tubular pile orifice; recorded construction materials are input so as to obtain piling starting and halting information, recorded geological materials are input so as to obtain stratigraphic distribution and underground water information, and characteristic parameters of the detected pile are input; the computer implements the processing of the information, summarizes total defects of the detected pile, and calculates the integrity factor Beta of the detected pile. The endoscopic detecting method of the invention has the advantaged of convenient in-site operation, simple device structure and lower cost.
Description
Technical field
The present invention relates to a kind of Geotechnical Engineering detection method, relate in particular to the detection method of steel tube centrifugal concrete pipe pile integrality.
Background technology
Steel tube centrifugal concrete pipe pile is the concrete tubular pile that a kind of new development is got up, because the pile tube cross section diameter is less and be open section, the detection method of its pile body integrity does not also have so far.The industry standard JGJ106-2003 of the People's Republic of China (PRC) " building pile foundation inspection specifications " provides core drilling method, sound wave transmission method, low deformation dynamic inspection method and high strain dynamic test method to detect pile body integrity.Core drilling method is to utilize along the means of pile body entire axial length boring coring directly pile concrete and pile end groundwork situation to be detected, and is only applicable to that cross section diameter is big, the less solid concrete stake of length-diameter ratio.Therefore sound wave transmission method is to utilize the transmission principle of sound wave that pile concrete medium situation is detected, and is only applicable to the pre-buried foundation pile of two or two above sound detecting pipes in the form process.Low deformation dynamic inspection method and high strain dynamic test method are to apply the transient impact acting force at place, stake top, and by actual measurement pile body dynamic reflective signal, whether nationality one dimension fluctuation theoretical analysis reflected signal judges the pile body integrity of stake unusually.Because the transient impact acting force that low deformation dynamic inspection method applies is less, the energy attenuation of in stake, propagating in response to the Reeb, at the bottom of causing instrument not detect or than the depths reflected signal, low deformation dynamic inspection method is only applicable to the less or long 30m of stake of length-diameter ratio with interior pile integrity detection.Because the transient impact acting force that the high strain dynamic test method applies is bigger, at the bottom of the energy attenuation that stress wave is propagated in stake is not enough to influence or than the reception of depths reflected signal, the high strain dynamic test method can be carried out pile integrity detection in the axial compression resistance bearing capacity that detects stake, but the high strain dynamic test method is not easy to execute-in-place because of the transient impact acting force that the weight of 3 ~ 8 tons of weights of needs applies.Because low deformation dynamic inspection method and high strain dynamic test method are the pile body integrities that nationality one dimension fluctuation theoretical analysis is judged stake, not exclusively suitable for this heterogeneous material one dimension of steel tube centrifugal concrete pipe pile wave theory, the still to be tested and correction of the integrity detection result of dynamic measurement of pile.
Chinese patent 02139931.X discloses a kind of core drilling method and has measured tubular pile centrifugal high-strength concrete compressive strength method, this method is to utilize probing to obtain shorter core pile concrete compressive strength is detected, be only applicable to driven pile not or near the driven pile top of being convenient to the core boring sampling operation of can basseting behind the excavation pile concrete compressive strength detect.
Summary of the invention
The object of the present invention is to provide a kind of endoscopic detection method of steel tube centrifugal concrete pipe pile integrality, this endoscopic detection method adopts camera to overhang in the steel tube centrifugal concrete pipe pile hole, after pile tube inside detected image is transferred to ground, by Analysis on defects being obtained the pile tube integrality, this detection method execute-in-place is convenient, device construction is simple, and cost is lower.
The present invention is achieved in that a kind of endoscopic detection method of steel tube centrifugal concrete pipe pile integrality, it is characterized in that: camera is overhang in the steel tube centrifugal concrete pipe pile hole, camera links to each other with computing machine through water-proof cable, also be connected with scale rope chi on the camera, camera obtains the information in the hole of post and is shown in photographed images on the computer display and is stored in the storer;
Underground water and core information in the hole of post be can obtain by handling the endoscopic photography image, underground water, sidewall ground water seepage source, underground water table elevation information in the hole of post comprised, and core height, height of water level alteration trend information in the stake hole;
Hole of post inner concrete surface quality information be can obtain by handling the endoscopic photography image, the broken zone of hole of post inner concrete, the broken form of concrete, the broken region height of concrete, width and depth information comprised; And hole of post inner concrete crack, fracture morphology, fracture interval, fracture width and length information;
The construction information of input record can obtain the piling process and stop hammer information; The geologic information of input record can obtain stratigraphic distribution and underground water information;
Import the characteristic parameter of examined stake, comprise the long L of stake, stake external radius R, stake inside radius r, the bending stiffness EJ of stake, the lateral reaction Coefficient m information of foundation soil;
Above-mentioned information is handled, gathered, calculate the integrity factor β of examined stake, β=1-∑ α for whole defectives of examined
if
Ai-∑ α
if
Li,
In the formula: α
i: the defective coefficient;
f
Ai: the axial bearing capacity influence coefficient;
f
Li: side direction bearing capacity influence coefficient.
The present invention is owing to adopted above-mentioned technical scheme, compared with prior art, its good effect is: adopt camera to overhang in the steel tube centrifugal concrete pipe pile hole pile tube inside is detected, can detect the integrality of steel tube centrifugal concrete pipe pile than the position, deep, it is less and for open section to have solved invar pipe centrifugal concrete pipe pile cross section diameter, can't adopt core drilling method, sound wave transmission method is to the problem that concrete pile body integrality detects, and also having solved this heterogeneous material of steel tube centrifugal concrete pipe pile is the low deformation dynamic inspection method and the inapplicable problem of high strain dynamic test method of foundation with the one dimension wave theory.
The endoscopic detection method of steel tube centrifugal concrete pipe pile integrality of the present invention provides a kind of means of observing concrete cracking order, fracture interval, fracture width and length for the beam test of steel tube centrifugal concrete pipe pile member.
The endoscopic detection method execute-in-place of steel tube centrifugal concrete pipe pile integrality of the present invention is convenient, and device construction is simple, and cost is lower.
Description of drawings
Fig. 1 is the endoscopic detection method process flow diagram of steel tube centrifugal concrete pipe pile integrality of the present invention;
Fig. 2 is the device synoptic diagram of the endoscopic detection method of enforcement steel tube centrifugal concrete pipe pile integrality of the present invention.
Among the figure: 1 water-proof CCD camera, 2 water-proof cables (water-proof cable and scale rope chi), 3 drums, 4 computing machines, 5 steel tube centrifugal concrete pipe piles (pile tube).
Embodiment
The invention will be further described below in conjunction with the drawings and specific embodiments.
Referring to Fig. 1, Fig. 2, peep pick-up unit in a kind of steel tube centrifugal concrete pipe pile integrality, comprise small-sized water-proof CCD camera 1, water-proof cable and scale rope chi 2, drum 3, computing machine 4.Water-proof cable 2 is wrapped in and connects camera 1 and computing machine 4 on the drum 3, and scale rope chi is wrapped in and connects camera 1 on the drum 3.
A kind of endoscopic detection method of steel tube centrifugal concrete pipe pile integrality, be that camera 1 is overhang in steel tube centrifugal concrete pipe pile 5 holes, control drum 3 winding water-proof cables and scale rope chi 2 and can descend and promote camera 1, by the position that rope chi scale can be read camera 1, camera 1 obtains the information in pile tube 5 holes and is shown in photographed images on the computer display and is stored in the storer.
Computing machine can obtain underground water and core information in the hole of post by handling the endoscopic photography image, comprises underground water, sidewall ground water seepage source, underground water table elevation information in the hole of post, and information such as core height, height of water level alteration trend in the stake hole.
Computing machine can obtain hole of post inner concrete surface quality information by handling the endoscopic photography image, comprises the broken zone of hole of post inner concrete, the broken form of concrete, the broken region height of concrete, width and depth information; And information such as hole of post inner concrete crack, fracture morphology, fracture interval, fracture width and length.
The construction information of input record can obtain the piling process and stop hammer information, comprises that hammer is heavy, the model and the length of stake, and piling zero-time and stopping the hammer time, every meter piling hammering number, hammer bar height change stops hammering into shape total hammering number, stops hammering into shape information such as pile penetration.
The geologic information of input record can obtain stratigraphic distribution and underground water information, comprises bearing course at pile end mechanical property and distribution situation, soft layer mechanical property and distribution situation, information such as artesian aquifer height of water level and distribution situation.
Import the characteristic parameter of examined stake, comprise the long L of stake, stake external radius R, stake inside radius r, the bending stiffness EJ of stake, the information such as lateral reaction Coefficient m of foundation soil.
Computing machine is handled above-mentioned information, gathers for whole defectives of examined, calculates the integrity factor β of examined stake, β=1-∑ α
if
Ai-∑ α
if
Li,
In the formula: α
i: the defective coefficient;
f
Ai: the axial bearing capacity influence coefficient;
f
Li: side direction bearing capacity influence coefficient.
If β=1.0, decidable is that pile body is complete, i.e. the stake of I class;
If 0.8≤β＜1.0 are judged to be the normal performance that pile body has light defects and can not influence the pile body structural bearing capacity, i.e. II class stake;
If 0.6≤β＜0.8, decidable is that pile body has open defect and influences the pile body structural bearing capacity, be i.e. III class stake;
If β＜0.6, decidable are for there being major defect, i.e. IV class stake.
Specifically, referring to Fig. 1,, import its place depth d for the i place defective of finding examined stake
i, calculate the axial bearing capacity influence coefficient f of defective to Piles for Friction Piles
Ai:
f
ai＝f
ai((L-d
i)/L)，
With defective to side direction bearing capacity influence coefficient f
Li:
f
li＝f
li(exp(-d
i(2Rm/(EJ))
0.2)；
Judge whether defective is that unknown cause infiltration or unknown cause piling hammering pile penetration do not have sudden change, if then get the defective factor alpha
i=1; If not, then import the defective width w of i place that observes
iAnd calculate its defective factor alpha
i=α
i(w
i/ (2 π r)).
Whole defectives for examined stake gather, and calculate the integrity factor β of examined stake:
β＝1-∑α
if
ai-∑α
if
li。
Claims (2)
1. the endoscopic detection method of a steel tube centrifugal concrete pipe pile integrality, it is characterized in that: camera is overhang in the steel tube centrifugal concrete pipe pile hole, camera links to each other with computing machine through water-proof cable, also be connected with scale rope chi on the camera, camera obtains the information in the hole of post and is shown in photographed images on the computer display and is stored in the storer;
Underground water and core information in the hole of post be can obtain by handling the endoscopic photography image, underground water, sidewall ground water seepage source, underground water table elevation information in the hole of post comprised, and core height, height of water level alteration trend information in the stake hole;
Hole of post inner concrete surface quality information be can obtain by handling the endoscopic photography image, the broken zone of hole of post inner concrete, the broken form of concrete, the broken region height of concrete, width and depth information comprised; And hole of post inner concrete crack, fracture morphology, fracture interval, fracture width and length information;
The construction information of input record can obtain the piling process and stop hammer information; The geologic information of input record can obtain stratigraphic distribution and underground water information;
Import the characteristic parameter of examined stake, comprise the long L of stake, stake external radius R, stake inside radius r, the bending stiffness EJ of stake, the lateral reaction Coefficient m information of foundation soil;
Above-mentioned information is handled, gathered, calculate the integrity factor β of examined stake, β=1-∑ α for whole defectives of examined
if
Ai-∑ α
if
1i,
In the formula: α
i: the defective coefficient;
f
Ai: the axial bearing capacity influence coefficient;
f
1i: side direction bearing capacity influence coefficient.
2. the endoscopic detection method of steel tube centrifugal concrete pipe pile integrality according to claim 1 is characterized in that: for the i place defective of finding examined stake, import its place depth d
i, calculate the axial bearing capacity influence coefficient f of defective to Piles for Friction Piles
Ai=f
Ai((L-d
i)/L) and defective are to side direction bearing capacity influence coefficient f
1i=f
1i(exp (d
i(2Rm/ (EJ))
0.2);
Judge whether defective is that unknown cause infiltration or unknown cause piling hammering pile penetration do not have sudden change, if then get the defective factor alpha
i=1; If not then importing the defective width w of i place that observes
iAnd calculate its defective factor alpha
i=α
i(w
i/ (2 π r)).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100427736A CN101334368A (en) | 2007-06-27 | 2007-06-27 | Steel tube centrifugal concrete pipe pile integrality endoscopic detection method |
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|---|---|---|---|
| CNA2007100427736A CN101334368A (en) | 2007-06-27 | 2007-06-27 | Steel tube centrifugal concrete pipe pile integrality endoscopic detection method |
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| Publication Number | Publication Date |
|---|---|
| CN101334368A true CN101334368A (en) | 2008-12-31 |
Family
ID=40197108
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103898931A (en) * | 2014-04-11 | 2014-07-02 | 广州建设工程质量安全检测中心有限公司 | Three-dimensional foundation pile detection device and method based on borehole radar |
| CN106106301A (en) * | 2016-08-15 | 2016-11-16 | 郭伟锋 | Floated automatic lifting Margarita freshwater mussel keeps hanging device and keeps hanging method |
| CN106193027A (en) * | 2016-08-31 | 2016-12-07 | 中建四局第建筑工程有限公司 | A kind of pile for prestressed pipe pile defect restorative procedure and device |
| CN107059957A (en) * | 2017-05-15 | 2017-08-18 | 中国十七冶集团有限公司 | Pile tube mass defect detection means and the method for rectifying deviation using the device |
| CN113466228A (en) * | 2021-06-28 | 2021-10-01 | 水利部交通运输部国家能源局南京水利科学研究院 | Method for detecting quality of lower part of mud surface of in-service pipe pile |
| CN113538366A (en) * | 2021-07-14 | 2021-10-22 | 健研检测集团有限公司 | Method and system for quantitatively evaluating defects of foundation pile based on in-hole imaging |
-
2007
- 2007-06-27 CN CNA2007100427736A patent/CN101334368A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103898931A (en) * | 2014-04-11 | 2014-07-02 | 广州建设工程质量安全检测中心有限公司 | Three-dimensional foundation pile detection device and method based on borehole radar |
| CN103898931B (en) * | 2014-04-11 | 2016-06-08 | 广州建设工程质量安全检测中心有限公司 | A kind of base stake three-dimensional detection device based on boring radar and base stake 3 D detection method |
| CN106106301A (en) * | 2016-08-15 | 2016-11-16 | 郭伟锋 | Floated automatic lifting Margarita freshwater mussel keeps hanging device and keeps hanging method |
| CN106106301B (en) * | 2016-08-15 | 2023-01-10 | 郭伟锋 | Suspension type automatic lifting pearl mussel hanging culture device and method |
| CN106193027A (en) * | 2016-08-31 | 2016-12-07 | 中建四局第建筑工程有限公司 | A kind of pile for prestressed pipe pile defect restorative procedure and device |
| CN107059957A (en) * | 2017-05-15 | 2017-08-18 | 中国十七冶集团有限公司 | Pile tube mass defect detection means and the method for rectifying deviation using the device |
| CN113466228A (en) * | 2021-06-28 | 2021-10-01 | 水利部交通运输部国家能源局南京水利科学研究院 | Method for detecting quality of lower part of mud surface of in-service pipe pile |
| CN113538366A (en) * | 2021-07-14 | 2021-10-22 | 健研检测集团有限公司 | Method and system for quantitatively evaluating defects of foundation pile based on in-hole imaging |
| CN113538366B (en) * | 2021-07-14 | 2024-04-05 | 健研检测集团有限公司 | Foundation pile defect quantitative evaluation method and system based on in-hole imaging |
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Open date: 20081231 |