CN103362149A - Method for detecting construction quality of cement mixing pile - Google Patents
Method for detecting construction quality of cement mixing pile Download PDFInfo
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- CN103362149A CN103362149A CN2013102892013A CN201310289201A CN103362149A CN 103362149 A CN103362149 A CN 103362149A CN 2013102892013 A CN2013102892013 A CN 2013102892013A CN 201310289201 A CN201310289201 A CN 201310289201A CN 103362149 A CN103362149 A CN 103362149A
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Abstract
A method for detecting the construction quality of a cement mixing pile comprises the five steps such as providing of a sampling device, on-site sampling, sample manufacturing and maintaining, strength testing, and data analysis, wherein the sampling device comprises four parts, namely an outer pipe, an inner pipe, a bolt and a conical head, wherein the inner pipe is arranged in the outer pipe, and is connected with the top of the outer pipe through the bolt; the conical head is arranged at the bottoms of the outer pipe and the inner pipe; partition boards are arranged in the inner pipe at certain intervals, so as to divide the inner pipe into a plurality of small spaces. The sampling device is adopted for on-site sampling, sample manufacturing and maintaining, strength testing, and data analysis of a just constructed cement mixing pile, so as to judge the construction quality of the cement mixing pile. The method is a new method for detecting the construction quality of the cement mixing pile; mechanical cutting is avoided; time and labor are saved.
Description
[technical field]
The present invention relates to technical field of civil engineering, specifically refer to a kind of detection method of cement mixing pile construction quality.
[background technology]
Cement mixing pile be utilize construction machinery with cement flour or cement paste action of forced stirring in foundation soil, after cement and the soil body reaction, form the pile body that intensity is higher, permeability is lower, comparatively commonly used in Soft Ground, pattern foundation pit supporting structure.In whipping process, cement jet is mapped in the soil body, if construction processing is bad, cement occurs easily and sprays inhomogeneous problem, causes agitation pile to have the lower zone of some intensity, reduces Bearing Capacity of Cement Deep Mixing Piles.
In order to check pile body continuity and uniformity, after cement-soil reaches design strength, usually adopting cement mixing pile to get core carries out unconfined compression strength test and tests, adopt the drive sampling of core sampling rig, because cement-soil has some strength, also will utilize machinery to cut sample after the taking-up, this mode of creeping into wastes time and energy.Also having a kind of method is to adopt sonic method to test, and sonic method is subjected to external influence factor numerous, and reliability is lower.
In view of this, the defective that the present invention is directed to prior art is furtherd investigate, and then has this case to produce.
[summary of the invention]
Technical problem to be solved by this invention is to provide a kind of detection method of cement mixing pile construction quality easy to use, has characteristics time saving and energy saving, that cost is relatively low.
The present invention is achieved in that
A kind of detection method of cement mixing pile construction quality is characterized in that: comprise the steps:
Step 1: a kind of sampler is provided:
This sampler comprises outer tube, inner tube, latch, conehead; Described inner tube places in the described outer tube; Described inner tube be connected the top of outer tube and adopt described latch to connect; Described conehead is positioned at below, described inner tube bottom; Described inner tube arranges a dividing plate at a certain distance, and inner tube is separated into some little spaces; Be equipped with a hole on the inner tubal wall of described each dividing plate below;
Step 2: field sampling:
When treating that the firm construction of cement mixing pile is complete, described conehead is placed on the center position of cement mixing pile, described inner tube and described outer effective described latch are connected, sling with crane, the bottom is stuck in the top of described conehead, then above-mentioned sampler is pressed to it in cement mixing pile along the cement mixing pile center, so that the bottom surface of sampler flushes with the bottom surface of cement mixing pile, open described latch, described outer tube is extracted, described inner tube is extracted described inner tube with crane stop 1-2 hour in cement mixing pile after;
Step 3: sample making and maintenance:
Adopt little spoon that the cement-soil in the little space of described inner tube is taken out, then insert in the pvc pipe of internal diameter 2cm, high 4cm and carry out maintenance, the pvc pipe inwall is coated with lubrication oil; The pvc pipe of inserting cement-soil is packed in the polybag, and sealing, prevents that the aqueous dispersion in the cement-soil from sending; Put into thermostatic chamber and carry out maintenance; Maintenance is taken out cement-soil after reaching some strength after 2 days in pvc pipe, continue to put into the polybag sealed maintenance, maintenance 28 days; Cement-soil in each little space is made 3 cement-soil samples;
Step 4: strength test:
The cement-soil sample that maintenance is good is put into and carries out the unconfined compression strength test on the universal testing machine, gets the average of 3 cement-soil sample strengths as the Compressive Strength of Soil-cement Mixture of corresponding depth.
Further, also comprise:
Step 5: data analysis:
Analyze the intensity of each cement-soil sample, if 10% soil cement intensity less than design strength, then the uniformity of cement mixing pile driving construction is relatively poor, can not meet design requirement.
The invention has the advantages that: because the complete soil cement intensity of just having constructed is lower, has certain flowability, the cement-soil at different depth place can flow into along the hole of inner tube in the little space at respective depth place, when inner tube is extracted, the cement-soil at different depth place is taken out of on the ground, the preparation standard sample is tested, the uniformity of test water earth.Therefore, the method has the characteristics convenient, that expense is lower of implementing, for a kind of new approach that provides is provided the cement-soil stirring pile construction uniformity.
[description of drawings]
The invention will be further described in conjunction with the embodiments with reference to the accompanying drawings.
Fig. 1 is sampler structural representation used in the present invention.
[specific embodiment]
See also shown in Figure 1ly, a kind of sampler for the cement mixing pile detection of construction quality comprises outer tube 1, inner tube 2, latch 3, conehead 4.Inner tube 2 places in the described outer tube 1; Inner tube 2 is connected the top and is adopted latch 3 to connect with outer tube; Conehead 4 is positioned at outer tube 1 and inner tube 2 bottoms; Inner tube 2 arranges a dividing plate 21 every 50cm, and inner tube 2 is separated into some little spaces; Be equipped with a hole 22 on each dividing plate 21 below inner tubes 2 wall.The external diameter of outer tube 1 is 114mm.It is conical that conehead 4 is, and the top is entrapped in inner tube 2 bottoms.
After above-mentioned sampler is made, carry out successively field sampling, sample making and maintenance, strength test and data analysis step.Below by three embodiment specific implementation process of the present invention is described.
Embodiment one:
Certain highway soft soil ground adopts cement mixing pile to process, and the embankment filled soil height is 2.2m, and weak soil is from the earth's surface, and thickness is 6.7m, and water content is 65%, and engineering properties is relatively poor.Cement mixing pile adopts powder spray piling, and cement mixing content is 12%, and the stake footpath is 0.5m, and pilespacing is 1.2m, and the stake end adopts square to lay out pile to the Soft Soil Layer bottom, and cement mixing pile pile body compressive strength design load is 1.00MPa.In order to detect along the pile body construction quality that stirs of cement mixing pile up and down, whether have weak band exist, adopt the method for this invention to detect if differentiating.
Adopt above-mentioned sampler, when the firm construction of on-the-spot cement mixing pile is complete, conehead 4 is placed on the center position of cement mixing pile, inner tube 2 and outer tube 1 usefulness latch 3 are connected, sling with crane, the bottom is stuck in the top of conehead 4, then sampler is pressed to it in cement mixing pile along the cement mixing pile center, so that the flushing of the bottom surface of sampler and cement mixing pile.Open latch 3, outer tube 1 is extracted, inner tube 2 stops after 1-2 hour in cement mixing pile, with crane inner tube 2 is extracted.
Adopt little spoon that the cement-soil in the inner tube 2 little spaces is taken out, then insert in the pvc pipe of internal diameter 2cm, high 4cm and carry out maintenance, the pvc pipe inwall is coated with lubrication oil; The pvc pipe of inserting cement-soil is packed in the polybag, and sealing, prevents that the aqueous dispersion in the cement-soil from sending; Put into thermostatic chamber and carry out maintenance; Maintenance is taken out cement-soil after reaching some strength after 2 days in pvc pipe, continue to put into the polybag sealed maintenance, maintenance 28 days; Cement-soil in each little space is made 3 cement-soil samples, has made altogether 39 cement-soil samples.
The cement-soil that maintenance is good is put into and carries out the unconfined compression strength test on the universal testing machine, obtain its compressive strength, the 3 cement-soil sample intensity that each little space makes are averaged, along pile body up and down each depth Compressive Strength of Soil-cement Mixture be respectively 1.23MPa, 1.14MPa, 1.33MPa, 1.24MPa, 1.31MPa, 1.23MPa, 1.27MPa, 1.35MPa, 1.43MPa, 1.41MPa, 1.42MPa, 1.24MPa, 1.13MPa.
To the data analysis of above-mentioned test, the soil cement intensity of each degree of depth meets the requirements all greater than design load, illustrates that this cement mixing construction quality of pile is good.
Embodiment two:
Certain frame house, foundation soil is respectively from top to bottom: silty clay, thickness are 2.0m; Muddy soft soil, thickness are 3.5m; Clay, thickness are 5.5m, below are granite.Because the intensity of muddy soft soil is lower, compressibilty is larger, adopts cement mixing pile to process this ground.Cement mixing pile adopts wet shot, and cement mixing content is 18%, and the stake footpath is 0.5m, and pilespacing is 1.2m, and the stake end adopts square to lay out pile to the Soft Soil Layer bottom, and cement mixing pile pile body compressive strength design load is 1.50MPa.In order to detect along the pile body uniformity and the construction quality that stir of cement mixing pile up and down, adopt the method for this invention to detect.
Adopt above-mentioned sampler, when the firm construction of on-the-spot cement mixing pile is complete, conehead 4 is placed on the center position of cement mixing pile, inner tube 2 and outer tube 1 usefulness latch 3 are connected, sling with crane, the bottom is stuck in the top of conehead 4, then sampler is pressed to it in cement mixing pile along the cement mixing pile center, so that the flushing of the bottom surface of sampler and cement mixing pile.Open latch 3, outer tube 1 is extracted, inner tube 2 stops after 1-2 hour in cement mixing pile, with crane inner tube 2 is extracted.
Adopt little spoon that the cement-soil in the inner tube 2 little spaces is taken out, then insert in the pvc pipe of internal diameter 2cm, high 4cm and carry out maintenance, the pvc pipe inwall is coated with lubrication oil; The pvc pipe of inserting cement-soil is packed in the polybag, and sealing, prevents that the aqueous dispersion in the cement-soil from sending; Put into thermostatic chamber and carry out maintenance; Maintenance is taken out cement-soil after reaching some strength after 2 days in pvc pipe, continue to put into the polybag sealed maintenance, maintenance 28 days; Cement-soil in each little space is made 3 cement-soil samples, has made altogether 21 cement-soil samples.
The cement-soil that maintenance is good is put into and carries out the unconfined compression strength test on the universal testing machine, obtain its compressive strength, the 3 cement-soil sample intensity that each little space makes are averaged, along pile body up and down the unconfined compression strength of each cement-soil be respectively 1.63MPa, 1.89MPa, 1.33MPa, 1.83MPa, 1.67MPa, 1.72MPa, 1.78MPa.
To the data analysis of above-mentioned test, the soil cement intensity of 1 degree of depth is arranged less than design load, disqualification rate is 14.3%, greater than 10%, so this cement mixing construction quality of pile is not good.
Case study on implementation three:
Certain project site is the soft plastic clay ground of homogeneous, and soil body severe is 19kN/m
3, characteristic value of foundation bearing capacity is 70kPa, adopts cement mixing pile to process, stake footpath 600mm, and pilespacing is 1.2m, and square lays out pile, and stake is long to be 10m, and the pile strength design load is 1.20MPa.In order to detect along the pile body uniformity and the construction quality that stir of cement mixing pile up and down, adopt the method for this invention to detect.
Adopt above-mentioned sampler, when the firm construction of on-the-spot cement mixing pile is complete, conehead 4 is placed on the center position of cement mixing pile, inner tube 2 and outer tube 1 usefulness latch 3 are connected, sling with crane, the bottom is stuck in the top of conehead 4, then sampler is pressed to it in cement mixing pile along the cement mixing pile center, so that the flushing of the bottom surface of sampler and cement mixing pile.Open latch 3, outer tube 1 is extracted, inner tube 2 stops after 1-2 hour in cement mixing pile, with crane inner tube 2 is extracted.
Adopt little spoon that the cement-soil in the inner tube 2 little spaces is taken out, then insert in the pvc pipe of internal diameter 2cm, high 4cm and carry out maintenance, the pvc pipe inwall is coated with lubrication oil; The pvc pipe of inserting cement-soil is packed in the polybag, and sealing, prevents that the aqueous dispersion in the cement-soil from sending; Put into thermostatic chamber and carry out maintenance; Maintenance is taken out cement-soil after reaching some strength after 2 days in pvc pipe, continue to put into the polybag sealed maintenance, maintenance 28 days; Cement-soil in each little space is made 3 cement-soil samples, has made altogether 60 cement-soil samples.
The cement-soil that maintenance is good is put into and carries out the unconfined compression strength test on the universal testing machine, obtain its compressive strength, the 3 cement-soil sample intensity that each little space makes are averaged, along pile body up and down the unconfined compression strength of each cement-soil be respectively 1.65MPa, 1.29MPa, 1.35MPa, 1.53MPa, 1.53MPa, 1.22MPa, 1.18MPa, 1.35MPa, 1.39MPa, 1.32MPa, 1.43MPa, 1.54MPa, 1.55MPa, 1.46MPa, 1.25MPa, 1.42MPa, 1.45MPa, 1.43MPa, 1.63MPa, 1.52MPa.
To the data analysis of above-mentioned test, the soil cement intensity of 1 degree of depth is arranged less than design load, disqualification rate is 5%, less than 10%, so this cement mixing construction quality of pile is differentiated for good.
The method that the present invention adopts is because the complete soil cement intensity of just having constructed is lower, has certain flowability, the cement-soil at different depth place can flow into along the hole of inner tube in the little space at respective depth place, when inner tube is extracted, the cement-soil at different depth place is taken out of on the ground, the preparation standard sample is tested, the uniformity of test water earth.Therefore, the method has the characteristics convenient, that expense is lower of implementing, for a kind of new approach that provides is provided the cement-soil stirring pile construction uniformity.
Claims (2)
1. the detection method of a cement mixing pile construction quality is characterized in that: comprise the steps:
Step 1: a kind of sampler is provided:
This sampler comprises outer tube, inner tube, latch, conehead; Described inner tube places in the described outer tube; Described inner tube be connected the top of outer tube and adopt described latch to connect; Described conehead is positioned at below, described inner tube bottom; Described inner tube arranges a dividing plate at a certain distance, and inner tube is separated into some little spaces; Be equipped with a hole on the inner tubal wall of described each dividing plate below;
Step 2: field sampling:
When treating that the firm construction of cement mixing pile is complete, described conehead is placed on the center position of cement mixing pile, described inner tube and described outer effective described latch are connected, sling with crane, the bottom is stuck in the top of described conehead, then above-mentioned sampler is pressed to it in cement mixing pile along the cement mixing pile center, so that the bottom surface of sampler flushes with the bottom surface of cement mixing pile, open described latch, described outer tube is extracted, described inner tube is extracted described inner tube with crane stop 1-2 hour in cement mixing pile after;
Step 3: sample making and maintenance:
Adopt little spoon that the cement-soil in the little space of described inner tube is taken out, then insert in the pvc pipe of internal diameter 2cm, high 4cm and carry out maintenance, the pvc pipe inwall is coated with lubrication oil; The pvc pipe of inserting cement-soil is packed in the polybag, and sealing, prevents that the aqueous dispersion in the cement-soil from sending; Put into thermostatic chamber and carry out maintenance; Maintenance is taken out cement-soil after reaching some strength after 2 days in pvc pipe, continue to put into the polybag sealed maintenance, maintenance 28 days; Cement-soil in each little space is made 3 cement-soil samples;
Step 4: strength test:
The cement-soil sample that maintenance is good is put into and carries out the unconfined compression strength test on the universal testing machine, gets the average of 3 cement-soil sample strengths as the Compressive Strength of Soil-cement Mixture of corresponding depth.
2. the detection method of a kind of cement mixing pile construction quality as claimed in claim 1 is characterized in that:
Also comprise:
Step 5: data analysis:
Analyze the intensity of each cement-soil sample, if 10% soil cement intensity less than design strength, then the uniformity of cement mixing pile driving construction is relatively poor, can not meet design requirement.
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| CN2013102892013A CN103362149A (en) | 2013-07-10 | 2013-07-10 | Method for detecting construction quality of cement mixing pile |
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| CN2013102892013A CN103362149A (en) | 2013-07-10 | 2013-07-10 | Method for detecting construction quality of cement mixing pile |
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Cited By (3)
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| CN106337448A (en) * | 2016-10-26 | 2017-01-18 | 佛山市禅城区建设工程质量安全检测站 | Extracting method for test engineering piles |
| CN110130419A (en) * | 2019-05-29 | 2019-08-16 | 华侨大学 | A kind of cement mixing pile detection of construction quality device and method |
| CN110308291A (en) * | 2018-06-26 | 2019-10-08 | 沈阳阿尔洛科技有限公司 | Cement quality intelligent control laboratory |
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Cited By (4)
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| CN106337448A (en) * | 2016-10-26 | 2017-01-18 | 佛山市禅城区建设工程质量安全检测站 | Extracting method for test engineering piles |
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Application publication date: 20131023 |