CN104132846B - A kind of tubular pile body concrete total cross-section ruggedness test method - Google Patents
A kind of tubular pile body concrete total cross-section ruggedness test method Download PDFInfo
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- CN104132846B CN104132846B CN201410310097.6A CN201410310097A CN104132846B CN 104132846 B CN104132846 B CN 104132846B CN 201410310097 A CN201410310097 A CN 201410310097A CN 104132846 B CN104132846 B CN 104132846B
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Abstract
The present invention relates to a kind of tubular pile body concrete total cross-section ruggedness test method.First the present invention extracts a root canal pile by often criticizing pile tube, is cut into three standard specimens that ratio of height to diameter is 1:1, carries out compressive strength test respectively, calculate compressive strength mean value to three standard specimens in pile tube stirrup non-encrypted area; Then the compression strength value of a certain standard specimen is deducted compressive strength mean value, namely obtain the intensity extreme difference of this standard specimen; If when the absolute value of the intensity extreme difference of arbitrary standard specimen and the ratio of compressive strength mean value are within 30%, getting compressive strength mean value is pile concrete compressive strength; If when the absolute value of the intensity extreme difference of arbitrary standard specimen and the ratio of compressive strength mean value are greater than 30%, getting minimum compression strength value is pile concrete compressive strength.Selection science of the present invention, step is simple and method reasonable, the tubular pile body concrete crushing strength that the concrete crushing strength that obtains of inspection institute is more realistic simultaneously.
Description
Technical field
The present invention relates to a kind of tubular pile body concrete total cross-section ruggedness test method.
Background technology
Pretensioned prestressed concrete pipe pile, refers to a kind of slender hollow body concrete prefabricated element adopting pretensioned prestressing and centrifugal casting to make.Such stake have be suitable for that the raw quality of industrial scale is easy to ensure, bearing capacity of single pile is high, fast to engineering geologic condition strong adaptability, speed of application, the on-the-spot advantage such as pollution-free; therefore, the application of pretensioned prestressed concrete pipe pile in engineering is more and more extensive.
Tubular pile body strength grade of concrete is generally C60 or C80, the construction of pile tube generally adopts hammering method or static pressure method at present, two kinds of method requirements to tubular pile body intensity are high, as tubular pile body intensity is not enough, easily cause cracking of pipe pile or quick-fried stake accident in work progress.Due to the existing pile concrete compressive strength method of inspection check and obtain compressive strength with actual pile concrete compressive strength and do not meet, therefore when there is cracking of pipe pile or quick-fried stake accident in work progress, often initiation pile tube manufacturer and tube pile construction unit are to the dispute of on-the-spot tubular pile body compressive strength.
In order to accurately detect and reflect actual pile concrete compressive strength, in the urgent need to improving the ruggedness test method of pile concrete.
Summary of the invention
The object of this invention is to provide a kind of tubular pile body concrete total cross-section ruggedness test method.Method of inspection selection science in the present invention, method is reasonable, and assay is comparatively accurate.
For achieving the above object, the present invention adopts following technical scheme:
A kind of tubular pile body concrete total cross-section compressive strength method of inspection, it comprises the steps:
1), a root canal pile is extracted by often criticizing pile tube, three standard specimens are made in the pile tube stirrup non-encrypted area cutting processing of this pile tube, height and the external diameter ratio of described three standard specimens are 1:1, then respectively compressive strength test is carried out to three standard specimens, obtain the compression strength value of each standard specimen;
2) the compressive strength mean value of three standard specimens, is calculated; Then to each standard specimen, the compression strength value of this standard specimen is deducted described compressive strength mean value, namely obtain the intensity extreme difference of this standard specimen;
3) if when the ratio of the absolute value of the intensity extreme difference of each standard specimen and described compressive strength mean value is within 30%, getting described compressive strength mean value is pile concrete compressive strength; If when the ratio of the absolute value of the intensity extreme difference of any one standard specimen and described compressive strength mean value is greater than 30%, the minimum compression strength value got in three standard specimens is pile concrete compressive strength.
Preferably, step 1) in, pile tube cuts the core obtained and first carries out end face processing, namely adopt epoxy mortar or polymer cement mortar levelling, can standard specimen be obtained.
Beneficial effect of the present invention is: selection science of the present invention, and step is simple and method reasonable, the tubular pile body concrete crushing strength that the concrete crushing strength that obtains of inspection institute is more realistic simultaneously.
Accompanying drawing explanation
Fig. 1 is the test section schematic diagram intercepting ratio of height to diameter 1:1 in this explanation in pile tube stirrup non-encrypted area.
Fig. 2 is the end face machining sketch chart of the pile tube test section intercepted in this explanation.
In figure, the implication of label symbol is as follows:
1-end plate, 2-spiral bar, 3-prestressed steel bar
4-pile protection hoop, 5-test section
The long L1 of L-pipe pile-pile tube hoop reinforcement length
L2-pile tube stirrup non-encrypted area length
D-pile tube overall diameter H-test section height t-pile tube wall thickness
Embodiment
As shown in Figure 1, the pile tube of disputing on from there being intensity or the pile tube of same batch, extract a root canal pile, pile tube length is L, specification specifies, the pitch of pile tube two ends 2000mm scope inside spin muscle is 45mm (being pile tube hoop reinforcement), and the pitch of remainder spiral bar is 80mm (being pile tube stirrup non-encrypted area).Shown in Fig. 1, the region at length L1 place, pile tube hoop reinforcement is pile tube hoop reinforcement, L1=2000mm; And the region at length L2 place, pile tube stirrup non-encrypted area is pile tube stirrup non-encrypted area.
Intercept test section 5 i.e. standard specimen in the region at length L2 place, pile tube stirrup non-encrypted area, test section height H is identical with pile tube overall diameter D, and namely the ratio of height to diameter of test section 5 pile body is 1:1.
First test section 5 after sawing carries out end face processing, and namely two end faces of test section 5 all adopt epoxy mortar or polymer cement mortar is levelling obtains end plate 1, and the ratio of height to diameter of test section 5 pile body containing end plate 1 remains 1:1.
Should by the following specifying measurement test section 5 i.e. size of standard specimen before carrying out compressive strength test:
(1) mean diameter
Orthogonal two positions are measured in the middle part of test section 5 with vernier caliper, the arithmetic mean getting measurement, as the diameter of test section 5, is accurate to 0.5mm;
(2) highly
By steel tape or Steel Ruler, test section 5 is measured, be accurate to 1mm;
(3) verticality
Measure the angle of test section 5 two end faces and bus with vernier protractor, be accurate to 0.1 °;
(4) flatness
Abut against on the end face of test section 5 with Steel Ruler or angle square, one side rotates Steel Ruler, and the gap between Steel Ruler and test section 5 end face measured by one side clearance gauge; Also other specialized equipments can be adopted to measure.
When the dimensional discrepancy of test section 5 and presentation quality exceed following numerical value, corresponding test data is invalid:
(1) when the actual ratio of height to diameter (H/D) of test section 5 is less than 0.95 of requirement ratio of height to diameter or is greater than 1.05;
(2) along test section 5 height arbitrary diameter and mean diameter differ by more than 2mm;
(3) irregularity degree of test section 5 end face is greater than 0.1mm in 100mm length;
(4) non-perpendicularity of test section 5 end face and axis is greater than 1 °;
(5) test section 5 has crack or has other larger defects.
The concrete crushing strength of test section 5 can be calculated as follows:
f
cu,cor＝Nc/A
In formula: f
cu, corthe concrete crushing strength value (MPa) of-test section 5;
The maximum pressure (N) that the compression test of Nc-test section 5 records;
A-test section 5 resisting cross-sections area (mm
2);
To the same model pile tube of same engineering, at least carry out more than three groups to test, when ratio between the absolute value and the compressive strength mean value of three standard specimens of the intensity extreme difference of three standard specimens is all within 30%, getting compressive strength mean value is pile concrete compressive strength; Otherwise the minimum compression strength value got in three standard specimens is pile concrete compressive strength.
In order to have better understanding to technical characteristic of the present invention, object and beneficial effect, below in conjunction with specific embodiment, the present invention will be further described, but the present invention is not restricted to the present embodiment.
Embodiment 1
Common drill core test concrete vertical compression Strength Testing Methods, its core diameter got out is 75 ~ 100mm, differ comparatively large with the size of conventional tubular pile body diameter 400 ~ 800mm, and subsized specimen can not react the vertical compression bearing capacity of tubular pile body all-sidedly and accurately.
The ruggedness test method in the present invention is now adopted to contrast with conventional core drilling method.
The pile tube that specimen sample adopts is PHC400-AB-95 model, and its parameter is: the PHC piles that pile tube overall diameter D is 400mm, pile tube wall thickness t is 95mm, centrifugal concrete Intensity Design grade is C80, prestress reinforcement is 7 Φ 10.7mm.
The total cross-section pile body compressive strength standard test specimen and test section 5 that 3 height and overall diameter (ratio of height to diameter) are 1:1 is processed into according to the cutting method in the present invention, first test section 5 after sawing carries out end face processing, adopt epoxy mortar or polymer cement mortar levelling, finally make test section 5 Pass Test canonical sized; In order to better compare the accuracy of two kinds of methods, it is the sample of 75mm that same root canal pile drills through 3 diameters; Two groups of samples carry out compressive strength test respectively the most at last, and interpretation of result is as table 1.
Table 1 tubular pile body total cross-section compressive strength
For the ruggedness test method in the present invention, its result of calculation is as follows:
1) the compressive strength mean value of standard specimen 1#, 2#, 3# is:
2) compressive strength of standard specimen 1# and the difference of compressive strength mean value and intensity extreme difference are:
F
Δ 1=f
1#-f
flat=92.3-89.0=3.3MPa;
Can obtain
The intensity extreme difference that can be regarded as out standard specimen 2#, 3# sample is successively respectively-1.8MPa and-1.5MPa, and the intensity extreme difference of three standard specimens is all less than 30% (0.3f of compressive strength mean value
flat).
Therefore, the pile tube total cross-section concrete strength f of the final gained of ruggedness test method in the present invention is adopted
1=89.0MPa, and the concrete strength f that can calculate employing core-drilling method according to " the centrifugal strong concrete compressive strength test method of drilling core checking " and obtain
2=72.6MPa; The concrete strength of the pile tube adopted in this test is C80, and the compressive strength according to the cube concrete anti-compression test gained tubular pile concrete at scene, pile tube field is f
c=80.0MPa.
It is to be noted, the main muscle of prestress is contained in institute's accepted standard test specimen in ruggedness test method of the present invention, and reinforcing bar has certain compressive strength, therefore in ruggedness test method of the present invention, the concrete strength of gained should be greater than the actual concrete strength of pile tube, and the pile tube total cross-section concrete strength f in the present embodiment
1be greater than the actual compressive strength f of tubular pile concrete
c, thus the concrete crushing strength of the method gained of present patent application meets the actual concrete strength of pile tube more, and intensity is about 1.22 ~ 1.24 times of core drilling method concrete crushing strength value.
Claims (1)
1. a tubular pile body concrete total cross-section compressive strength method of inspection, is characterized in that comprising the steps:
1), a root canal pile is extracted by often criticizing pile tube, three standard specimens are made in the pile tube stirrup non-encrypted area cutting processing of this pile tube, height and the external diameter ratio of described three standard specimens are 1:1, then respectively compressive strength test is carried out to three standard specimens, obtain the compression strength value of each standard specimen;
2) the compressive strength mean value of three standard specimens, is calculated; Then to each standard specimen, the compression strength value of this standard specimen is deducted described compressive strength mean value, namely obtain the intensity extreme difference of this standard specimen;
3) if when the ratio of the absolute value of the intensity extreme difference of each standard specimen and described compressive strength mean value is within 30%, getting described compressive strength mean value is pile concrete compressive strength; If when the ratio of the absolute value of the intensity extreme difference of any one standard specimen and described compressive strength mean value is greater than 30%, the minimum compression strength value got in three standard specimens is pile concrete compressive strength;
Step 1) in, pile tube cuts the core obtained and first carries out end face processing, namely adopt epoxy mortar or polymer cement mortar levelling, can standard specimen be obtained.
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| CN201410310097.6A CN104132846B (en) | 2014-06-30 | 2014-06-30 | A kind of tubular pile body concrete total cross-section ruggedness test method |
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| CN104132846B true CN104132846B (en) | 2016-03-23 |
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| CN108627397A (en) * | 2018-05-11 | 2018-10-09 | 建研科技股份有限公司 | Structural performance inspection method for large prefabricated reinforced concrete column member |
| CN111323257A (en) * | 2020-04-09 | 2020-06-23 | 中国海洋大学 | Method for detecting compressive strength of sintered common bricks in masonry and application |
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|---|---|---|---|---|
| CN1424568A (en) * | 2002-12-30 | 2003-06-18 | 蒋元海 | Tubular pile centrifugal high strength concrete compression strength testing method by drill core |
| CN1896712A (en) * | 2006-06-14 | 2007-01-17 | 郭杨 | Planar loading testing method and tester for self-balanced deep foundation piles |
| CN102877490A (en) * | 2012-09-18 | 2013-01-16 | 河海大学 | Method for detecting quality of large-diameter tubular pile at low strain |
| CN103185682A (en) * | 2011-12-27 | 2013-07-03 | 上海市第七建筑有限公司 | Loading method for axial forces of pre-stressed pipe pile |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6080619A (en) * | 1983-10-06 | 1985-05-08 | Inayoshi Kogyo:Kk | Method and apparatus for measuring bearing capacity of pile in piling work |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1424568A (en) * | 2002-12-30 | 2003-06-18 | 蒋元海 | Tubular pile centrifugal high strength concrete compression strength testing method by drill core |
| CN1896712A (en) * | 2006-06-14 | 2007-01-17 | 郭杨 | Planar loading testing method and tester for self-balanced deep foundation piles |
| CN103185682A (en) * | 2011-12-27 | 2013-07-03 | 上海市第七建筑有限公司 | Loading method for axial forces of pre-stressed pipe pile |
| CN102877490A (en) * | 2012-09-18 | 2013-01-16 | 河海大学 | Method for detecting quality of large-diameter tubular pile at low strain |
Non-Patent Citations (1)
| Title |
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| 《塑性混凝土弹性模量的试验研究》;李清富等;《水力发电》;20050331;第31卷(第3期);第30-32页 * |
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