CN103046583A - Cone penetration test detection method for cement mixing pile with preset guide pipe - Google Patents
Cone penetration test detection method for cement mixing pile with preset guide pipe Download PDFInfo
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- CN103046583A CN103046583A CN201210588721XA CN201210588721A CN103046583A CN 103046583 A CN103046583 A CN 103046583A CN 201210588721X A CN201210588721X A CN 201210588721XA CN 201210588721 A CN201210588721 A CN 201210588721A CN 103046583 A CN103046583 A CN 103046583A
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Abstract
The invention discloses a cone penetration test detection method for a cement mixing pile with a preset guide pipe. The method includes the steps: firstly, perpendicularly inserting a PVC (polyvinyl chloride) pipe with the bottom closed into the center of the a cement mixing pile within half an hour after cement mixing pile construction, so that a reserved detection hole is formed; and secondly, continuously detecting the pile body strength of the cement mixing pile by means of cone penetration test detection when the cement mixing pile reaches a certain age. The invention further discloses a cement mixing pile body quality evaluation method. The cone penetration test detection method for the cement mixing pile with the preset guide pipe retains the advantages of convenience in implementation, rapidness and low cost, overcomes the defect that a probe is easy to deflect out of the pile so as to be incapable of detecting the pile body completely, and is capable of effectively guaranteeing the angle of the probe.
Description
Technical field
The invention belongs to the technical field of civil engineering, be specifically related to a kind of cement mixing pile static sounding detection method that presets conduit.
Background technology
Cement mixing pile is Soft Ground engineering Scheme of Strengthening commonly used, and it is its important Quality link that pile detects.Detect the to hole compressive strength test of core of current specifications regulation, cement mixing pile is main, and the sampling observation ratio is 3%-5%.The detection method of the loosing core cycle is long, and efficient is low, and cost is high, can't reach the purpose of fast detecting agitation pile quality.
The static sounding test can obtain the continuous strength characteristic information of tested object, has advantages of that enforcement is convenient, fast, cost is low.Conventional Using Cone Penetration Test is for detection of cement mixing pile, and the easy deflection of popping one's head in goes out stake can not complete detection pile body.
Therefore, need a kind of new cement mixing pile to visit detection method to address the above problem.
Summary of the invention
Goal of the invention: the present invention is directed to the defective of cement mixing pile detection method of the prior art, a kind of cement mixing pile static sounding detection method that presets conduit is provided.
Technical scheme: for solving the problems of the technologies described above, the cement mixing pile static sounding detection method that presets conduit of the present invention adopts following technical scheme:
A kind of cement mixing pile static sounding detection method that presets conduit may further comprise the steps:
1), after finishing, the cement mixing pile driving construction in half an hour, inserts the pvc pipe of bottom lock in the central vertical of described cement mixing pile, formation reservation detection hole;
2), when reaching certain length of time, adopts cement mixing pile the strength of the mixing pile of the described cement mixing pile of static sounding detection method continuous detecting.
Preferably, the diameter of pvc pipe described in the step 1) is 40 ± 1mm.
Preferably, step 2) concrete steps of the strength of the mixing pile of the described cement mixing pile of employing static sounding detection method continuous detecting are as follows in: the hole heart that the described reservation of alignment probe is detected the hole, described probe is fixed on the sounding rod, utilize static press device that described sounding rod at the uniform velocity is pressed into described cement mixing pile along described pvc pipe, utilize described probe to detect static point resistance and sidewall resistance.
Preferably, also comprise quiet spy data collecting instrument, wire connects described quiet spy data collecting instrument and described probe.Quiet spy data collecting instrument is used for showing static point resistance and the sidewall resistance of popping one's head in and recording.
Preferably, the static point resistance of pvc pipe described in the step 1) is less than 0.5MPa, and sidewall resistance is less than 5kPa.
Be 7 days the length of time of the cement mixing pile preferably, step 2).
Preferably, described sounding rod is 0.5-1.2m/mim along the press-in speed that described pvc pipe at the uniform velocity is pressed into described cement mixing pile.
The invention also discloses a kind of quality evaluating method of cement mixing pile, may further comprise the steps:
A, in the test pile stage of cement mixing pile, by each described cement mixing pile static sounding detection method that presets conduit of claim 1-6 cement mixing pile is detected;
B, the testing result that step a is obtained are set up corresponding relation with 28 days core compressive strength, estimate the pile quality of the pile body of cement mixing pile.
Inventive principle: detect the hole because probe diameter is slightly larger than to reserve, probe can detect static point resistance and sidewall resistance simultaneously, sets up corresponding relation with this core compressive strength with 28 days, estimates the pile quality of pile body.Owing to there being sense channel, avoided appearance because of probe 3 shift phenomenons that the unequal factor of strength of the mixing pile causes, be detected as power and reach 100%.
Beneficial effect: the cement mixing pile static sounding detection method that presets conduit of the present invention, namely kept and implemented the advantage convenient, fast, that cost is low, solve again the easy deflection of popping one's head in and gone out the defective that stake can not complete detection pile body, can effectively guarantee the angle of popping one's head in.
Description of drawings
Fig. 1 schematic flow sheet that presets the cement mixing pile static sounding detection method of conduit of the present invention.
Fig. 2 structural representation that presets the cement mixing pile of conduit of the present invention.
The specific embodiment
Below in conjunction with the drawings and specific embodiments, further illustrate the present invention, should understand these embodiment only is used for explanation the present invention and is not used in and limits the scope of the invention, after having read the present invention, those skilled in the art all fall within the application's claims limited range to the modification of the various equivalent form of values of the present invention.
See also illustrated in figures 1 and 2ly, the cement mixing pile static sounding detection method that presets conduit of the present invention may further comprise the steps:
1), after finishing, cement mixing pile 1 construction in half an hour, inserts the pvc pipe 2 of bottom lock in the central vertical of cement mixing pile 1, formation reservation detection hole; Wherein, the diameter of pvc pipe 2 is 40 ± 1mm.The static point resistance of pvc pipe 2 is less than 0.5MPa, and sidewall resistance is less than 5kPa.
2), when cement mixing pile 1 reaches certain length of time, adopt the strength of the mixing pile of static sounding detection method continuous detecting cement mixing pile 1, wherein be 7 days the length of time of cement mixing pile 1.Wherein adopt the concrete steps of strength of the mixing pile of static sounding detection method continuous detecting cement mixing pile 1 as follows: will pop one's head in and 3 aim at and reserve the hole heart that detects holes, probe 3 is fixed on the sounding rod 4, utilize static press device 5 that sounding rod 4 at the uniform velocity is pressed into cement mixing pile 1 along pvc pipe 2, utilize probe 3 to detect static point resistance and sidewall resistance, wire 6 connects probe 3 and quiet spy data collecting instrument 7, utilizes quiet spy data collecting instrument 7 to show static point resistance and the sidewall resistance that records.Wherein, the press-in speed of sounding rod 4 is 0.5-1.2m/mim.
Detect the hole because probe diameter is slightly larger than to reserve, probe can detect static point resistance and sidewall resistance simultaneously, sets up corresponding relation with this core compressive strength with 28 days, estimates the pile quality of pile body.Owing to there being sense channel, avoided appearance because of probe 3 shift phenomenons that the unequal factor of strength of the mixing pile causes, in the test section scope, choose at random 24 in 120 piles and detect, be detected as power and reach 100%.
The cement mixing pile 1 static sounding detection method that presets conduit of the present invention has namely kept and has implemented the advantage convenient, fast, that cost is low, has solved again the 3 easy deflections of popping one's head in and has gone out the defective that stake can not complete detection pile body, and 3 angle can effectively guarantee to pop one's head in.
See also illustrated in figures 1 and 2, the agitation pile pile quality static sounding detection method that presets conduit of the present invention is to insert minor diameter pvc pipe 2 at the pile body center in the short time after cement mixing pile 1 construction is finished, wherein, the diameter of pvc pipe 2 is 40 ± 1mm, forms to reserve to detect hole.Adopt conventional Using Cone Penetration Test continuous detecting strength of the mixing pile during the length of time in regulation, wherein, be 7 days regulation length of time of cement mixing pile among the present invention.The method that presets conduit is that in half an hour, cement-soil not yet solidifies after cement mixing pile 1 construction is finished, still be in liquid state at the pile body center, the vertical pvc pipe 2 that inserts bottom lock, anhydrous mud is composed and is deposited in managing, and pvc pipe 2 becomes the reservation detection hole of cement soil pile after solidifying.Pvc pipe 2 chosen material intensity are lower, diameter is than the pop one's head in finished industrial product of 3 smaller (being about 40mm) of quiet spy, and length is long and decide according to stake, and the length of pvc pipe 2 is identical with the length of cement mixing pile 1.
During detection, probe 3 is aimed at and is reserved the hole heart that detects the hole, utilizes static press device 5 at the uniform velocity to be pressed into along pvc pipe 2 with the sounding rod 4 of probe 3 and detects stake, and wherein, press-in speed is 0.5-1.2m/mim.Because probe 3 slightly larger in diameter detect the hole in reserving, probe 3 can detect static point resistance and sidewall resistance simultaneously, quiet spy data collecting instrument 7 connects probe 3 by wire 6, utilize quiet spy data collecting instrument 7 to show static point resistance and the sidewall resistance that records, set up corresponding relation with this core compressive strength with 28 days, estimate the pile quality of pile body.Owing to there being sense channel, probe 3 shift phenomenons of having avoided appearance to cause because of the unequal factor of strength of the mixing pile, in the test section scope, choosing at random 24 in 120 piles detects, the testing result of the method and drilled drawing-core result of the test are in full accord, be detected as power and reach 100%, prove that the method is successfully.
The agitation pile test pile stage, Using Cone Penetration Test detects and boring core unconfined compression strength test by cement mixing pile 1 is carried out, associating static sounding static point resistance and 28d unconfined compression strength, the corresponding relation of different soil static point resistance and unconfined compression strength is formulated calibration curve under the definite technique of foundation.During the rear large-area construction of test pile success, can detect the static point resistance that obtains by static sounding, the establishing criteria curve is determined the 28d unconfined compression strength, estimates pile quality.
This method is tried out in engineering, and the engineering effect is good, has solved the partially stake problem of popping one's head in when static sounding detects, and can detect quickly and easily the quality of pile body, and cost is low, has widely popularizing application prospect.
Claims (8)
1. a cement mixing pile static sounding detection method that presets conduit is characterized in that, may further comprise the steps:
1), after finishing, the cement mixing pile driving construction in half an hour, inserts the pvc pipe of bottom lock in the central vertical of described cement mixing pile, formation reservation detection hole;
2), when reaching certain length of time, adopts cement mixing pile the strength of the mixing pile of the described cement mixing pile of static sounding detection method continuous detecting.
2. the cement mixing pile static sounding detection method that presets conduit as claimed in claim 1 is characterized in that, the diameter of pvc pipe described in the step 1) is 40 ± 1mm.
3. the cement mixing pile static sounding detection method that presets conduit as claimed in claim 1, it is characterized in that, step 2) concrete steps of the strength of the mixing pile of the described cement mixing pile of employing static sounding detection method continuous detecting are as follows in: the hole heart that the described reservation of alignment probe is detected the hole, described probe is fixed on the sounding rod, utilize static press device that described sounding rod at the uniform velocity is pressed into described cement mixing pile along described pvc pipe, utilize described probe to detect static point resistance and sidewall resistance.
4. the cement mixing pile static sounding detection method that presets conduit as claimed in claim 3 is characterized in that, also comprise quiet spy data collecting instrument, wire connects described quiet spy data collecting instrument and described probe.
5. the cement mixing pile static sounding detection method that presets conduit as claimed in claim 1 is characterized in that, the static point resistance of pvc pipe described in the step 1) is less than 0.5MPa, and sidewall resistance is less than 5kPa.
6. the cement mixing pile static sounding detection method that presets conduit as claimed in claim 1 is characterized in that step 2) described in length of time of cement mixing pile be 7 days.
7. the cement mixing pile static sounding detection method that presets conduit as claimed in claim 3 is characterized in that, described sounding rod is 0.5-1.2m/mim along the press-in speed that described pvc pipe at the uniform velocity is pressed into described cement mixing pile.
8. the quality evaluating method of a cement mixing pile is characterized in that, may further comprise the steps:
A, in the test pile stage of cement mixing pile, by each described cement mixing pile static sounding detection method that presets conduit of claim 1-7 cement mixing pile is detected;
B, the testing result that step a is obtained are set up corresponding relation with 28 days core compressive strength, estimate the pile quality of the pile body of cement mixing pile.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103835323A (en) * | 2014-03-21 | 2014-06-04 | 金陵科技学院 | Loading and measurement device for static-pressure pile model test |
| CN115726406A (en) * | 2022-12-08 | 2023-03-03 | 上海勘察设计研究院(集团)有限公司 | Pile length detection comprehensive evaluation method for existing construction engineering pile |
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| JP2004279285A (en) * | 2003-03-18 | 2004-10-07 | Port & Airport Research Institute | Evaluation method for glogging state of open end pile tip using cone penetration test |
| KR100895875B1 (en) * | 2007-07-16 | 2009-04-30 | 김용기 | Load test method in multi-layered soils and rocks |
| CN101705678A (en) * | 2009-11-04 | 2010-05-12 | 广东永基建筑基础有限公司 | Cone penetration method |
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| JP2004279285A (en) * | 2003-03-18 | 2004-10-07 | Port & Airport Research Institute | Evaluation method for glogging state of open end pile tip using cone penetration test |
| KR100895875B1 (en) * | 2007-07-16 | 2009-04-30 | 김용기 | Load test method in multi-layered soils and rocks |
| CN101705678A (en) * | 2009-11-04 | 2010-05-12 | 广东永基建筑基础有限公司 | Cone penetration method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103835323A (en) * | 2014-03-21 | 2014-06-04 | 金陵科技学院 | Loading and measurement device for static-pressure pile model test |
| CN115726406A (en) * | 2022-12-08 | 2023-03-03 | 上海勘察设计研究院(集团)有限公司 | Pile length detection comprehensive evaluation method for existing construction engineering pile |
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| CN103046583B (en) | 2014-12-10 |
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Inventor after: Li Guowei Inventor after: Zhang Guobing Inventor after: Jiang Wei Inventor after: Wei Shuhong Inventor after: Zhou Yang Inventor after: Lu Xiaocen Inventor after: Lu Ji Inventor before: Li Guowei Inventor before: Zhang Guobing Inventor before: Jiang Wei Inventor before: Wei Shuhong Inventor before: Zhou Yang |
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Free format text: CORRECT: INVENTOR; FROM: LI GUOWEI ZHANG GUOBING JIANG WEI WEI SHUHONG ZHOU YANG TO: LI GUOWEI ZHANG GUOBING JIANG WEI WEI SHUHONG ZHOU YANG LU XIAOCEN LU JI |
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