CN104763000A - Detection method for completeness of foundation pile - Google Patents
Detection method for completeness of foundation pile Download PDFInfo
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- CN104763000A CN104763000A CN201510151564.XA CN201510151564A CN104763000A CN 104763000 A CN104763000 A CN 104763000A CN 201510151564 A CN201510151564 A CN 201510151564A CN 104763000 A CN104763000 A CN 104763000A
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- 238000001514 detection method Methods 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 claims abstract description 43
- 230000001133 acceleration Effects 0.000 claims abstract description 25
- 229920006351 engineering plastic Polymers 0.000 claims abstract description 6
- 238000007405 data analysis Methods 0.000 claims description 15
- 238000013480 data collection Methods 0.000 claims description 15
- 238000004458 analytical method Methods 0.000 claims description 7
- 238000009434 installation Methods 0.000 claims description 5
- 230000005284 excitation Effects 0.000 abstract 1
- 230000005540 biological transmission Effects 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention provides a detection method for completeness of a foundation pile. The method comprises the steps 1, symmetrically mounting a plurality of acceleration sensors which are connected to a detection data acquiring analyzing instrument on the outer side surface of the foundation pile, close to the pile top; 2, providing a semispherical engineering plastic head heavy hammer being not less than 50kg in weight, lifting the heavy hammer and setting the lowering distance of the heavy hammer during detecting; 3, knocking within the grinding and treating range of the top surface of the foundation pile through the heavy hammer, transmitting the resulting stress wave to the detection data acquiring analyzing instrument through the acceleration sensor to acquire and analyze the data; 4, determining whether the acquired data are repeated; if not, knocking again; if so, entering step 5; 5, determining whether an obvious pile bottom signal appears; if so, calculating and analyzing and preparing detection report; if not so, increasing the lowering distance or increasing the weight of the heavy hammer, and returning to step 3. According to the method, the completeness of the pile body can be detected through the stress wave generated by medium energy excitation, so that no deviation occurs, and moreover, high-frequency interference can be reduced.
Description
Technical field
The present invention relates to a kind of construction work detection technique, particularly a kind of detection method of the foundation pile integrity between Large strain method and low strain dynamic method.
Background technology
The integrity detection of pile foundation is the guarantee of pile foundation trouble free service, for building provides epochmaking safety guarantee.At present, the method of pile detection is divided into two large classes, one class is loading test method, and another kind of is integrity detection method, and that commonly uses at present in integrity detection method has: core drilling method, sound wave transmission method, Large strain method (simultaneously also for loading test) and low strain dynamic method detection method.These detection methods respectively have its applicable elements.Core drilling method, sound wave transmission method detection method are applicable to castinplace pile, and these two kinds of methods and Large strain method cost all higher, be difficult to require that engineering adopts them to generally investigate, and low strain dynamic method cost low velocity is fast, but because the energy excited is very little, limitation is strong, has significant limitation, even have very large supposition composition to the detection of long stake, large diameter pile.
The inventive method is that the stress wave utilizing medium energy exciting to produce between Large strain method and low strain dynamic method is to a kind of detection method of pile integrity detection.
Summary of the invention
The technical problem to be solved in the present invention, is the detection method providing a kind of foundation pile integrity, utilizes stress wave that medium energy exciting produces to pile integrity detection, bias can not occur, convenient operation, and can reduce High-frequency Interference.
The present invention is achieved in that a kind of detection method of foundation pile integrity, comprising:
Step 1, near the lateral surface place on stake top, a plurality of acceleration transducer is installed at foundation pile symmetrically; And a plurality of acceleration transducer is all connected to detection data collection and analysis instrument;
Step 2, adopt the nose heave hammer of hemispherical engineering plastics, and weight weight is not less than 50kg; Lift weight during detection and set the distance that falls of weight;
In step 3, the scope that allows weight knock to cross in foundation pile end face grinding process, the stress wave that weight knocks generation is delivered in described detection data collection and analysis instrument by acceleration transducer and carries out data acquisition and analysis;
Whether the data that step 4, judgement collect have repeatability, no, then again knock, be, then carry out next step;
Step 5, judging whether visible obviously signal at the bottom of stake, is then carry out computation and analysis and go out examining report, no, then strengthen apart from or strengthen weight weight, getting back to step 3.
Further, the installation site distance foundation pile end face 10 ± 1cm of described acceleration transducer.
Further, described a plurality of acceleration transducer all connects described detection data collection and analysis instrument by snap joint, and the stress wave that described weight knocks generation is delivered to detect in data collection and analysis instrument by this snap joint by described acceleration transducer and carries out data acquisition and analysis.
Further, in step 1, in 2 ~ 3 foundation stakes, installing acceleration transducer simultaneously, when detecting, being connected with described detection data collection and analysis instrument by the acceleration transducer on the different foundation pile of snap joint rotation dismounting.
Further, described weight weight is also not more than 200kg, to ensure the quick of detection speed.
Further, the lifting of described weight is fixed on the enough horizontal cross bars of rigidity by weight by guiding conduit into, this horizontal cross bar by machinery or artificial Fulcrum carry, and weight by one tripping gear adjust fall distance.
Tool of the present invention has the following advantages:
1, the inventive method is that a kind of stress wave utilizing medium energy exciting to produce between Large strain method and low strain dynamic method is to a kind of detection method of pile integrity detection, both can carry out pile foundation quality generaI investigation with lower cost, proterties at the bottom of pile quality and stake can be judged more accurately again.
2, the inventive method is different from low strain dynamic method, current low strain dynamic method is still at end face sensor installation, for preventing damaging sensor, the limited extent that the size of power hammer and weight increase, current maximum, force hammer weight is 15kg, sensor is arranged on the lateral surface place of foundation pile near stake top by the inventive method, thus more sufficient position can be had to knock, power bell weight is minimum is 50kg, according to the increase of pile length, diameter, also can strengthen weight, but quick in order to what detect, should not 200kg be greater than.
3, the inventive method is also different from Large strain method, and high strain monitoring method equipment is huge, and need mechanical assistance time mobile, cost is high, cannot generally investigate foundation pile.Because drop hammer, bottom is flat, needs large-scale saddle to prevent bias of dropping hammer.The power hammer average weight of the inventive method, can be operated by two workmans, the head of power hammer adopts hemispherical engineering plastic stub bar, bias can not occur, and can reduce High-frequency Interference.
Accompanying drawing explanation
The present invention is further illustrated in conjunction with the embodiments with reference to the accompanying drawings.
Fig. 1 is the checkout gear figure of foundation pile integrity of the present invention.
Fig. 2 is the flowchart of foundation pile integrity method of the present invention.
Detailed description of the invention
As depicted in figs. 1 and 2, the detection method of foundation pile integrity of the present invention, comprising:
Step 1, near the lateral surface place on stake top, a plurality of acceleration transducer 1 is installed at foundation pile A symmetrically; Preferably described acceleration transducer 1 is arranged on below foundation pile A end face 10 ± 1cm, and namely the installation site distance foundation pile end face of described acceleration transducer is 9-11cm place.Excavation is not needed to install to below ground like this.And a plurality of acceleration transducer 1 is all connected to detection data collection and analysis instrument 3 by snap joint 2.
Step 2, adopt the nose heave hammer 4 of hemispherical engineering plastics, and weight 4 weight is not less than 50kg; Make heavy bell weight medium like this, and be hemispherical, bias can not occur when knocking, therefore, foundation pile A pile crown large volume can not be caused to destroy, can not be corrupted to the concrete of foundation pile in the darker scope in side place yet, therefore sensor does not need to arrange excessively dark.In addition, for ensureing the quick of detection speed, also can limit weight weight and being not more than 200kg.
Lift weight 4 during detection and set the distance that falls of weight 4; The lifting of described weight 4 is fixed on the enough horizontal cross bars of rigidity 6 by weight 4 by guiding conduit 5 into, this horizontal cross bar 6 by machinery or artificial Fulcrum 52 carry, and weight 4 by one tripping gear 7 adjust fall distance.
In step 3, the scope that allows weight 4 knock to cross in foundation pile end face grinding process, the stress wave that weight 4 knocks generation to be delivered in described detection data collection and analysis instrument 3 by this snap joint 2 by acceleration transducer 1 and to carry out data acquisition;
Step 4, judge to detect the data that data collection and analysis instrument 3 collects and whether have repeatability, no, then getting back to step 3 and again knock and image data, is then carry out next step;
Step 5, judging to detect the whether visible obviously signal at the bottom of stake of data that data collection and analysis instrument 3 collects, is then carry out computation and analysis and go out examining report, no, then strengthen apart from or strengthen weight 4 weight, getting back to step 3.
Wherein, for improving detection efficiency, in step 1, in 2 ~ 3 foundation stake A, installing acceleration transducer 1 simultaneously, when detecting, being connected with described detection data collection and analysis instrument 3 by the acceleration transducer 1 on the different foundation pile of snap joint 2 rotation dismounting.
Tool of the present invention has the following advantages:
1, the inventive method is that the stress wave utilizing medium energy exciting to produce between Large strain method and low strain dynamic method is to a kind of detection method of pile integrity detection, both can carry out pile foundation quality generaI investigation with lower cost, proterties at the bottom of pile quality and stake can be judged more accurately again.
2, the inventive method is different from low strain dynamic method, current low strain dynamic method is still at stake end face sensor installation, for preventing damaging sensor, the limited extent that the size of power hammer and weight increase, current maximum, force hammer weight is 15kg, sensor is arranged on the lateral surface place of foundation pile near stake top by the inventive method, thus more sufficient position can be had to knock, power bell weight is minimum is 50kg, according to the increase of pile length, diameter, also can strengthen weight, but quick in order to what detect, should not 200kg be greater than.
3, the inventive method is also different from Large strain method, and high strain monitoring method equipment is huge, and need mechanical assistance time mobile, cost is high, cannot generally investigate foundation pile.Because drop hammer, bottom is flat, needs large-scale saddle to prevent bias of dropping hammer.The power hammer average weight of the inventive method, can be operated by two workmans, the head of power hammer adopts hemispherical engineering plastic stub bar, bias can not occur, and can reduce High-frequency Interference
Although the foregoing describe the specific embodiment of the present invention; but be familiar with those skilled in the art to be to be understood that; specific embodiment described by us is illustrative; instead of for the restriction to scope of the present invention; those of ordinary skill in the art, in the modification of the equivalence done according to spirit of the present invention and change, should be encompassed in scope that claim of the present invention protects.
Claims (6)
1. a detection method for foundation pile integrity, is characterized in that: comprising:
Step 1, near the lateral surface place on stake top, a plurality of acceleration transducer is installed at foundation pile symmetrically; And a plurality of acceleration transducer is all connected to detection data collection and analysis instrument;
Step 2, adopt the nose heave hammer of hemispherical engineering plastics, and weight weight is not less than 50kg; Lift weight during detection and set the distance that falls of weight;
In step 3, the scope that allows weight knock to cross in foundation pile end face grinding process, the stress wave that weight knocks generation is delivered in described detection data collection and analysis instrument by acceleration transducer and carries out data acquisition and analysis;
Whether the data that step 4, judgement collect have repeatability, no, then again knock, be, then carry out next step;
Step 5, judging whether visible obviously signal at the bottom of stake, is then carry out computation and analysis and go out examining report, no, then strengthen apart from or strengthen weight weight, getting back to step 3.
2. the detection method of a kind of foundation pile integrity according to claim 1, is characterized in that: the installation site distance foundation pile end face 10 ± 1cm of described acceleration transducer.
3. the detection method of a kind of foundation pile integrity according to claim 1 and 2, it is characterized in that: described a plurality of acceleration transducer all connects described detection data collection and analysis instrument by snap joint, the stress wave that described weight knocks generation is delivered to detect in data collection and analysis instrument by this snap joint by described acceleration transducer and carries out data acquisition and analysis.
4. the detection method of a kind of foundation pile integrity according to claim 3, it is characterized in that: in step 1, in 2 ~ 3 foundation stakes, install acceleration transducer simultaneously, when detecting, be connected with described detection data collection and analysis instrument by the acceleration transducer on the different foundation pile of snap joint rotation dismounting.
5. the detection method of a kind of foundation pile integrity according to claim 1, is characterized in that: described weight weight is also not more than 200kg.
6. the detection method of a kind of foundation pile integrity according to claim 1 or 5, it is characterized in that: the lifting of described weight is fixed on the enough horizontal cross bars of rigidity by weight by guiding conduit into, this horizontal cross bar by machinery or artificial Fulcrum carry, and weight by one tripping gear adjust fall distance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510151564.XA CN104763000A (en) | 2015-04-02 | 2015-04-02 | Detection method for completeness of foundation pile |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510151564.XA CN104763000A (en) | 2015-04-02 | 2015-04-02 | Detection method for completeness of foundation pile |
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| CN104763000A true CN104763000A (en) | 2015-07-08 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107326943A (en) * | 2017-08-14 | 2017-11-07 | 厦门市工程检测中心有限公司 | A kind of method that low strain dynamic for realizing pile foundation gathers signal conformance |
| CN107842045A (en) * | 2017-11-29 | 2018-03-27 | 长沙宏宇建筑工程检测有限公司 | It is a kind of to shake punching hammer hammer systems and its application method |
| CN108625391A (en) * | 2018-08-14 | 2018-10-09 | 广东电网有限责任公司 | A kind of electric power pylon foundation structure integrality low strain dynamic upgoing wave detection device |
| CN108732244A (en) * | 2018-08-14 | 2018-11-02 | 广东电网有限责任公司 | A kind of striking mechanism |
| CN109537649A (en) * | 2018-12-20 | 2019-03-29 | 九江职业技术学院 | A kind of pile's integrity testing small strain detection robot |
| CN114592550A (en) * | 2022-03-02 | 2022-06-07 | 山东省水利科学研究院 | A fully automatic foundation pile integrity test force hammer |
| CN115752989A (en) * | 2022-11-07 | 2023-03-07 | 江苏中禧建设有限公司 | Device and method for detecting building foundation piles |
| CN119373166A (en) * | 2024-12-26 | 2025-01-28 | 中汽建工(洛阳)检测有限公司 | An automatic drop-hammer vibration device for high-strain pile testing that is easy to assemble and install |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107326943A (en) * | 2017-08-14 | 2017-11-07 | 厦门市工程检测中心有限公司 | A kind of method that low strain dynamic for realizing pile foundation gathers signal conformance |
| CN107842045A (en) * | 2017-11-29 | 2018-03-27 | 长沙宏宇建筑工程检测有限公司 | It is a kind of to shake punching hammer hammer systems and its application method |
| CN108625391A (en) * | 2018-08-14 | 2018-10-09 | 广东电网有限责任公司 | A kind of electric power pylon foundation structure integrality low strain dynamic upgoing wave detection device |
| CN108732244A (en) * | 2018-08-14 | 2018-11-02 | 广东电网有限责任公司 | A kind of striking mechanism |
| CN108732244B (en) * | 2018-08-14 | 2023-11-07 | 广东电网有限责任公司 | a percussion mechanism |
| CN109537649A (en) * | 2018-12-20 | 2019-03-29 | 九江职业技术学院 | A kind of pile's integrity testing small strain detection robot |
| CN114592550A (en) * | 2022-03-02 | 2022-06-07 | 山东省水利科学研究院 | A fully automatic foundation pile integrity test force hammer |
| CN115752989A (en) * | 2022-11-07 | 2023-03-07 | 江苏中禧建设有限公司 | Device and method for detecting building foundation piles |
| CN115752989B (en) * | 2022-11-07 | 2025-06-27 | 江苏中禧建设有限公司 | Building foundation pile detection device and method |
| CN119373166A (en) * | 2024-12-26 | 2025-01-28 | 中汽建工(洛阳)检测有限公司 | An automatic drop-hammer vibration device for high-strain pile testing that is easy to assemble and install |
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Application publication date: 20150708 |