CN103046583B - 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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- CN103046583B CN103046583B CN201210588721.XA CN201210588721A CN103046583B CN 103046583 B CN103046583 B CN 103046583B CN 201210588721 A CN201210588721 A CN 201210588721A CN 103046583 B CN103046583 B CN 103046583B
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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 of preset conduit.
Background technology
Cement mixing pile is the conventional Scheme of Strengthening of Soft Ground engineering, and it is its important Quality link that pile detects.Current specifications regulation, cement mixing pile detect the to hole compressive strength test of core is main, sampling observation ratio is 3%-5%.The detection method of the loosing core cycle is long, and efficiency is low, and cost is high, cannot reach the object of fast detecting agitation pile quality.
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 defect of cement mixing pile detection method of the prior art, a kind of cement mixing pile static sounding detection method of preset conduit is provided.
Technical scheme: for solving the problems of the technologies described above, the cement mixing pile static sounding detection method of preset conduit of the present invention adopts following technical scheme:
A cement mixing pile static sounding detection method for preset conduit, comprises the following steps:
1), after completing, cement mixing pile driving construction in half an hour, in the central vertical of described cement mixing pile, inserts the pvc pipe of bottom lock, the reserved hole of detecting of formation;
2), when reaching certain length of time, cement mixing pile adopts the strength of the mixing pile of cement mixing pile described in static sounding detection method continuous detecting.
Preferably, the diameter of pvc pipe described in step 1) is 40 ± 1mm.
Preferably, step 2) in, described in employing static sounding detection method continuous detecting, the concrete steps of the strength of the mixing pile of cement mixing pile are as follows: will described in alignment probe, reserve the hole heart that detects hole, described probe is fixed on sounding rod, utilize static press device that described sounding rod is at the uniform velocity 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.Static point resistance and the sidewall resistance of quiet spy data collecting instrument for showing that probe records.
Preferably, the static point resistance of pvc pipe described in 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, the press-in speed that described sounding rod is at the uniform velocity pressed into described cement mixing pile along described pvc pipe is 0.5-1.2m/mim.
The quality evaluating method that the invention also discloses a kind of cement mixing pile, comprises the following steps:
A, in the test pile stage of cement mixing pile, the cement mixing pile static sounding detection method by the preset conduit described in claim 1-6 any one detects cement mixing pile;
B, the testing result that step a is obtained are set up corresponding relation with the core compressive strength of 28 days, evaluate the pile quality of the pile body of cement mixing pile.
Inventive principle: because probe diameter is slightly larger than the reserved hole of detecting, probe can detect static point resistance and sidewall resistance simultaneously, and the core compressive strength with this with 28 days is set up corresponding relation, evaluates the pile quality of pile body.Owing to there is 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 of preset conduit of the present invention, retained and implemented the advantage convenient, fast, cost is low, solve again the easy deflection of popping one's head in and gone out the defect that stake can not complete detection pile body, can effectively guarantee the angle of probe.
Accompanying drawing explanation
The schematic flow sheet of the cement mixing pile static sounding detection method of Fig. 1 preset conduit of the present invention.
The structural representation of the cement mixing pile of Fig. 2 preset 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 is only not used in and limits the scope of the invention for the present invention is described, 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.
Refer to shown in Fig. 1 and Fig. 2, the cement mixing pile static sounding detection method of preset conduit of the present invention, comprises the following steps:
1), after having constructed, cement mixing pile 1 in half an hour, in the central vertical of cement mixing pile 1, inserts the pvc pipe 2 of bottom lock, the reserved hole of detecting of formation; 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, be wherein 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: probe 3 is aimed to the reserved hole heart that detects hole, probe 3 is fixed on sounding rod 4, utilize static press device 5 that sounding rod 4 is at the uniform velocity 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 recording.Wherein, the press-in speed of sounding rod 4 is 0.5-1.2m/mim.
Because probe diameter is slightly larger than the reserved hole of detecting, probe can detect static point resistance and sidewall resistance simultaneously, and the core compressive strength with this with 28 days is set up corresponding relation, evaluates the pile quality of pile body.Owing to there is sense channel, avoided appearance because of probe 3 shift phenomenons that the unequal factor of strength of the mixing pile causes, within the scope of test section, in 120 piles, choose at random 24 and detect, be detected as power and reach 100%.
The cement mixing pile 1 static sounding detection method of preset conduit of the present invention, has retained and has implemented the advantage convenient, fast, cost is low, has solved again the 3 easy deflections of popping one's head in and has gone out the defect that stake can not complete detection pile body, and 3 angle can effectively guarantee to pop one's head in.
embodiment 1
Refer to shown in Fig. 1 and Fig. 2, the agitation pile pile quality static sounding detection method of preset conduit of the present invention is after cement mixing pile 1 has been constructed, in the short time, at pile body center, to have inserted minor diameter pvc pipe 2, wherein, the diameter of pvc pipe 2 is 40 ± 1mm, forms the reserved hole that detects.In regulation, during the length of time, adopt conventional Using Cone Penetration Test continuous detecting strength of the mixing pile, wherein, in the present invention, be 7 days regulation length of time of cement mixing pile.The method of preset conduit is that in half an hour, cement-soil is not yet curing after cement mixing pile 1 has been constructed, at pile body center still in liquid state, the vertical pvc pipe 2 that inserts bottom lock, in pipe, anhydrous mud is composed and is deposited, and after solidifying, pvc pipe 2 becomes the reserved detection hole of cement soil pile.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 determine 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 the reserved hole heart that detects hole, utilizes static press device 5 that the sounding rod 4 with probe 3 is at the uniform velocity pressed into and detects stake along pvc pipe 2, and wherein, press-in speed is 0.5-1.2m/mim.Because probe 3 slightly larger in diameter are in the reserved hole of detecting, 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 recording, core compressive strength with this with 28 days is set up corresponding relation, evaluates 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, within the scope of test section, in 120 piles, choosing at random 24 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 successful.
The agitation pile test pile stage, by cement mixing pile 1 being carried out to Using Cone Penetration Test detection and boring core unconfined compression strength test, associating static sounding static point resistance and 28d unconfined compression strength, under the definite technique of foundation, the corresponding relation of different soil static point resistance and unconfined compression strength, formulates calibration curve.During the rear large-area construction of test pile success, can detect the static point resistance obtaining by static sounding, establishing criteria curve is determined 28d unconfined compression strength, evaluates pile quality.
This method is tried out in engineering, and engineering effect is good, probe stake problem partially when having solved static sounding and detecting, and can detect quickly and easily the quality of pile body, cost is low, has popularizing application prospect widely.
Claims (6)
1. a cement mixing pile static sounding detection method for preset conduit, is characterized in that, comprises the following steps:
1), after completing, cement mixing pile driving construction in half an hour, in the central vertical of described cement mixing pile, inserts the pvc pipe of bottom lock, the reserved hole of detecting of formation;
2), when reaching certain length of time, cement mixing pile adopts the strength of the mixing pile of cement mixing pile described in static sounding detection method continuous detecting, wherein, be 7 days the length of time of described cement mixing pile, described in employing static sounding detection method continuous detecting, the concrete steps of the strength of the mixing pile of cement mixing pile are as follows: will described in alignment probe, reserve the hole heart that detects hole, described probe is fixed on sounding rod, utilize static press device that described sounding rod is at the uniform velocity pressed into described cement mixing pile along described pvc pipe, utilize described probe to detect static point resistance and sidewall resistance.
2. the cement mixing pile static sounding detection method of preset conduit as claimed in claim 1, is characterized in that step 1) described in the diameter of pvc pipe be 40 ± 1mm.
3. the cement mixing pile static sounding detection method of preset conduit as claimed in claim 1, is characterized in that, also comprises quiet spy data collecting instrument, and wire connects described quiet spy data collecting instrument and described probe.
4. the cement mixing pile static sounding detection method of preset conduit as claimed in claim 1, is characterized in that step 1) described in the static point resistance of pvc pipe be less than 0.5MPa, sidewall resistance is less than 5kPa.
5. the cement mixing pile static sounding detection method of preset conduit as claimed in claim 3, is characterized in that, the press-in speed that described sounding rod is at the uniform velocity pressed into described cement mixing pile along described pvc pipe is 0.5-1.2m/mim.
6. a quality evaluating method for cement mixing pile, is characterized in that, comprises the following steps:
A, in the test pile stage of cement mixing pile, the cement mixing pile static sounding detection method by the preset conduit described in claim 1-5 any one detects cement mixing pile;
B, the static point resistance that step a is obtained or sidewall resistance are set up respectively corresponding relation with the core compressive strength of 28 days, evaluate the pile quality of the pile body of cement mixing pile.
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| CN103835323B (en) * | 2014-03-21 | 2015-09-23 | 金陵科技学院 | The loading of static pressed pile model testing and measurement mechanism |
| 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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| CN101705678A (en) * | 2009-11-04 | 2010-05-12 | 广东永基建筑基础有限公司 | Cone penetration method |
| CN201722711U (en) * | 2010-05-13 | 2011-01-26 | 机械工业勘察设计研究院 | Internal force testing device for PHC tubular pile load test |
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| JP4124342B2 (en) * | 2003-03-18 | 2008-07-23 | 独立行政法人港湾空港技術研究所 | Evaluation method of open-ended pile tip blockage using cone penetration test |
| KR100895875B1 (en) * | 2007-07-16 | 2009-04-30 | 김용기 | Load test method in multi-layered soils and rocks |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101705678A (en) * | 2009-11-04 | 2010-05-12 | 广东永基建筑基础有限公司 | Cone penetration method |
| CN201722711U (en) * | 2010-05-13 | 2011-01-26 | 机械工业勘察设计研究院 | Internal force testing device for PHC tubular pile load test |
Non-Patent Citations (3)
| Title |
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| 《浅谈水泥土搅拌桩的试验测试技术》;李芳珍;《科技信息》;20111230(第7期);全文 * |
| JP特开2004-279285A 2004.10.07 * |
| 李芳珍.《浅谈水泥土搅拌桩的试验测试技术》.《科技信息》.2011,(第7期),全文. * |
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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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