CN1424568A - Tubular pile centrifugal high strength concrete compression strength testing method by drill core - Google Patents
Tubular pile centrifugal high strength concrete compression strength testing method by drill core Download PDFInfo
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- CN1424568A CN1424568A CN 02139931 CN02139931A CN1424568A CN 1424568 A CN1424568 A CN 1424568A CN 02139931 CN02139931 CN 02139931 CN 02139931 A CN02139931 A CN 02139931A CN 1424568 A CN1424568 A CN 1424568A
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Abstract
A method of measuring the pressure resistant strength of centrifugated high strength concrete of pipe piles using core drilling method can measure and determine correctly the pressure resistant strength centrifugated high strength concrete hardened by the body structure of the pipe pile bodies, the measuring result is in good consistence with the result from the standard method for the standard cube test sample. The result of this method is 20%-100% higher than the results from the Standard YBJ 209-86 of the Metallurgy Ministry "The Technical Specification for Measuring Pressure Resistant Strength of the Structural Concrete Using Core Drilling Method" and the standard CECS 03:88 of the standardization committe of Engineering Construction of China "The Technical Specification for Measuring the Strength of Concrete Using core Drilling Method".
Description
Affiliated technical field
The present invention relates to maturing intensity test method in a kind of building structure.
Background technology
In the prior art, with maturing compressive strength method in the core drilling method mensuration structure following two kinds of methods are arranged: a kind of method is that former national Ministry of Metallurgical Industry is at the industry standard YBJ209-86 of Ministry of Metallurgical Industry of in October, 1986 promulgation " the core boring sampling method is measured structural concrete compressive strength technical regulation "; Another kind method is that the Chinese engineering construction standard council is at the Chinese engineering construction standard standard C ECS03:88 of the council of in November, 1988 promulgation " core drilling method detects concrete strength technical regulation ".The content of above-mentioned binomial method is identical, and the scope of application only refers to the normal concrete and the ordinary reinforced concrete of industry and covil construction, and its concrete strength grade is C10～C60, and concrete unit dry weight is 1900kg/m
3～2500kg/m
3For the pretensioned prestressed concrete pipe pile that China in recent years greatly develops, its strength grade of concrete is C60～C100, and concrete unit dry weight is 2500kg/m
3～2600kg/m
3, and be the high-strength concrete of centrifugal forming, xoncrete structure is because high speed centrifugation and serious layering, and promptly the outermost layer of pile tube wall thickness is that concrete layer, middle layer are screed, are the cement paste layer toward interior again, and the most inboard is centrifugal laitance layer.A large amount of detection practices over past ten years show that above-mentioned two kinds of methods are not suitable for the mensuration of tubular pile centrifugal high-strength concrete compressive strength.
Summary of the invention
The object of the present invention is to provide a kind of core drilling method to measure tubular pile centrifugal high-strength concrete compressive strength method, can measure the compressive strength of tubular pile body structure hardening centrifugal high-strength concrete with this method.
Technical scheme of the present invention is: a kind of core drilling method is measured tubular pile centrifugal high-strength concrete compressive strength method, at the tubular pile body middle part core machine that bores is installed, and before the brill core rig is fixed on the special-purpose fixed mount.The internal diameter of cartridge type drill bit adopts the specification of 70mm～ 100mm.Consider to be worth doing with tap water cooling drill bit and eliminating concrete material when advancing to bore.Carry out the core sawing after core drills through, laitance, cement paste and the screed of core inboard must be cut during sawing and amputate.After the core sawing, should adopt Plane surface grinding machine that the core both ends of the surface are polished processing, should control the core flatness especially, make it less than 0.06mm.Core is tackled the technical indicators such as distance in reinforcing bar axle center in mean diameter, core height, core flatness, the core depth of parallelism, core verticality, core cylindricity, core end face and the core and is measured before carrying out compressive strength test.Bore the compressive strength pressure testing of core and can adopt standard GB J81-1985 " normal concrete mechanical test method ", rule of thumb formula is calculated then.
The present invention compared with prior art has the following advantages: a kind of core drilling method is measured tubular pile centrifugal high-strength concrete compressive strength method, utilize this method can correctly measure the compressive strength of tubular pile body structure hardening centrifugal high-strength concrete, fine with the consistance of the standard method measurement result of cube standard specimen, than high by 20%～100% with the result of industry standard YBJ209-86 of Ministry of Metallurgical Industry " the core boring sampling method is measured structural concrete compressive strength technical regulation " and the Chinese engineering construction standard standard C ECS03:88 of the council " core drilling method detects concrete strength technical regulation " test.
Embodiment
A kind of core drilling method is measured tubular pile centrifugal high-strength concrete compressive strength method, should be at the tubular pile body middle part and be convenient to bore the core machine position with operation is installed, simultaneously beyond two end 1.5m, avoid deformed bar, spiral bar close around position and pile body punching block commissure.Bore the preceding fixed mount of making different pile tube specifications of core, fixed mount is fixed around the tensioning of pile body elder generation, and then rig is fixed on the special-purpose fixed mount.The internal diameter of cartridge type drill bit adopts the specification of 70mm～ 100mm.When advancing to bore, drill bit keeps vertical with the concrete surface of drilled goods, makes drill bit stressed even all around, and the speed of drilling through should be even, and the speed of propelling stroke should not be greater than 5mm/min.The pressure that is used to cool off drill bit when boring core and gets rid of the chilled water of concrete material bits is not less than 0.1MPa, and flow is not less than 3L/min.
Carry out the core sawing after core drills through, the height and the diameter ratio of core compressive strength test specimen are controlled at 1.0～1.2.During sawing machine processing core, core should be fixed, and make the vertical core axis in sawing plane.Laitance, cement paste and the screed of core inboard must be cut during sawing and amputate.Should adopt water cooling saw blade and core in the sawing process.After the core sawing, should adopt Plane surface grinding machine that the core both ends of the surface are polished processing.Polish and to guarantee in the processing procedure that the smooth and core end face of core end face and axis are perpendicular.Core is tackled its physical dimension before carrying out the compressive strength pressure testing, form and position tolerance is made following items and measured:
A) mean diameter:, get with the orthogonal six place's diameters in three positions, vernier caliper measurement core upper, middle and lower
Its arithmetic mean is accurate to 0.1mm;
B) core height:, get with 0 °, 90 °, 180 °, 270 ° height everywhere of vernier caliper measurement core end face
Its arithmetic mean is accurate to 0.1mm;
C) core flatness: Steel Ruler is erected on the traverse core end face, slowly rotate 360 ° then, measure with clearance gauge
Its maximal clearance is accurate to 0.01mm;
D) the core depth of parallelism: use maximal value, the minimum value of the height of vernier caliper measurement core, ask its difference, accurately
To 0.1mm;
E) core verticality: two pin of vernier protractor are close to core side and end face respectively, measure its maximum
Deviation is surveyed the other end after an end face has been surveyed again, is accurate to 0.1 °;
F) core cylindricity: Steel Ruler is leaned against on the bus of core, and along the circumferential direction rotates, with clearance gauge measure its with
Maximum slit between the core surface is accurate to 0.1mm;
G) distance in core end face and reinforcing bar axle center:, then should measure reinforcing bar axle center and core end face if core includes reinforcing bar
A nearer end apart from glass, be accurate to 0.1mm.
Presentation quality and form and position tolerance after the core processing should meet the following requirements:
A) core must not have visible crack, arrisdefect, hole;
B) the core cylindricity must not be greater than 1.5mm;
C) the core flatness must not be greater than 0.06mm;
D) the core depth of parallelism must not be greater than 1.0mm;
E) the core verticality must not be greater than 2.0 °.
The compressive strength determination that bores core is undertaken by the regulation to the test cube compressive strength test referring to standard GB J81-1985 " normal concrete mechanical test method ".But loading speed is controlled at the scope of 0.2MPa/s～0.4MPa/s, until peak load.During pressure testing, core is in room temperature natural air drying state.
Core test specimen concrete crushing strength R presses the calculating of following experimental formula:
R＝〔4F/(πd
2))·f
1·f
2????………………………………………(1)
In the formula:
R---core test specimen concrete crushing strength, MPa;
F---the maximum pressure that records during the core compression test, kN;
The mean diameter of d---core, mm;
f
1---core ratio of height to diameter correction factor;
f
1＝2.5/(1.5+1/α)?……………………………………(2)
f
2---core includes the reinforcing bar correction factor;
If only contain a reinforcing bar, then:
f
2＝1.0+1.5d
sh
s/(dh)?…………………………………(3)
If contain two reinforcing bars, then:
f
2＝1.0+1.5(d
s1h
s1+d
s2h
s2)/(dh)…………………………(4)
The ratio of height to diameter of α---core:
α＝H/d??……………………………………………………(5)
The height of H---core, mm;
d
s---core includes the diameter of reinforcing bar, mm;
h
s---core includes the distance of reinforcing bar axle center and the nearer end of core end face, mm.
The present invention compared with prior art has the following advantages: a kind of core drilling method is measured tubular pile centrifugal high-strength concrete compressive strength method, utilize this method can correctly measure the compressive strength of tubular pile body structure hardening centrifugal high-strength concrete, fine with the consistance of the testing result of cube specimen, higher by 20%～100% than the result who detects with industry standard YBJ209-86 of Ministry of Metallurgical Industry " the core boring sampling method is measured structural concrete compressive strength technical regulation " and the Chinese engineering construction standard standard C ECS03:88 of the council " core drilling method detects concrete strength technical regulation ".
Embodiment 1
A kind of core drilling method is measured tubular pile centrifugal high-strength concrete compressive strength method, with this method and the industry standard YBJ209-86 of Ministry of Metallurgical Industry " the core boring sampling method is measured structural concrete compressive strength technical regulation ", China engineering construction standard standard C ECS03:88 of the council " core drilling method detects concrete strength technical regulation " and cubic compressive strength standard test method are 600mm to diameter, wall thickness is 110mm, centrifugal concrete Intensity Design grade is C80, prestress reinforcement is that the pile body centrifugal concrete compressive strength of the prestressed high-strength concrete pile of 12 φ 10.7mm is measured.After boring core, sawing, polishing, core is made size and the morpheme error determine the results are shown in Table shown in 1.Above-mentioned 4 kinds of concrete strength test method results are shown in Table 2.
Table 1
| Core mean diameter d, mm | ????70 |
| Core height H after the end portion treatment, mm | ????80 |
| The core flatness (≤0.06mm) | ????0.04 |
| The core depth of parallelism (≤1.0mm) | ????0.8 |
| Core verticality (≤2 °) | ????1.5° |
| Core garden post degree (≤1.5mm) | ????1.0 |
| Core bar diameter d s | ????10.7 |
| Core reinforcement location h s | ????4.5 |
| The core number of steel bars | ????1 |
Table 2 unit: MPa
| The present patent application method | The cube standard test method | CECS03：88 | ?YBJ209-86 |
| ????89.4 | ?????88.6 | ????56.8 | ????52.3 |
Claims (4)
1. a core drilling method is measured tubular pile centrifugal high-strength concrete compressive strength method, bores the core machine in the installation of tubular pile body middle part, before the brill core rig is fixed on the special-purpose fixed mount, cools off drill bit and eliminating concrete material bits with tap water when advancing to bore.After the core sawing, should adopt Plane surface grinding machine that the core both ends of the surface are polished processing.Bore the compressive strength pressure testing of core and can adopt standard GB J81-1985 " normal concrete mechanical test method ", rule of thumb formula is calculated then.
2. a kind of core drilling method according to claim 1 is measured tubular pile centrifugal high-strength concrete compressive strength method, and its described feature is: the internal diameter of cartridge type drill bit adopts the specification of 70mm～ 100mm.
3. a kind of core drilling method according to claim 1 is measured tubular pile centrifugal high-strength concrete compressive strength method, and its described feature is: laitance, cement paste and the screed of core inboard must be cut during the core sawing and amputate.
4. a kind of core drilling method according to claim 1 is measured tubular pile centrifugal high-strength concrete compressive strength method, and its described feature is: should control the core flatness, make it less than 0.06mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 02139931 CN1424568A (en) | 2002-12-30 | 2002-12-30 | Tubular pile centrifugal high strength concrete compression strength testing method by drill core |
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| CN 02139931 CN1424568A (en) | 2002-12-30 | 2002-12-30 | Tubular pile centrifugal high strength concrete compression strength testing method by drill core |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101419144B (en) * | 2008-11-25 | 2011-07-27 | 同济大学 | Micro-crack on site concrete strength detecting method and implementing device thereof |
| CN102879266A (en) * | 2012-09-17 | 2013-01-16 | 山东省交通科学研究所 | Method for testing uniaxial compression elasticity modulus of inorganic binder stabilizing material |
| CN103822826A (en) * | 2013-07-22 | 2014-05-28 | 建研科技股份有限公司 | Method and instrument for detecting concrete compression strength with pulling escape method |
| CN104132846A (en) * | 2014-06-30 | 2014-11-05 | 安徽省建筑科学研究设计院 | Tube pile body concrete total cross section intensity examination method |
| CN104237489A (en) * | 2014-09-29 | 2014-12-24 | 华南理工大学 | Method for measuring self-healing property of pipe pile concrete |
| CN105699116A (en) * | 2016-01-22 | 2016-06-22 | 中国长江三峡集团公司 | Concrete dam coring method |
| CN105807007A (en) * | 2016-05-04 | 2016-07-27 | 广州建设工程质量安全检测中心有限公司 | Drilled core method detection system and detection method thereof |
| CN106226119A (en) * | 2016-07-20 | 2016-12-14 | 辽宁省水利水电科学研究院 | A kind of concrete undisturbed harvester |
-
2002
- 2002-12-30 CN CN 02139931 patent/CN1424568A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101419144B (en) * | 2008-11-25 | 2011-07-27 | 同济大学 | Micro-crack on site concrete strength detecting method and implementing device thereof |
| CN102879266A (en) * | 2012-09-17 | 2013-01-16 | 山东省交通科学研究所 | Method for testing uniaxial compression elasticity modulus of inorganic binder stabilizing material |
| CN102879266B (en) * | 2012-09-17 | 2015-04-08 | 山东省交通科学研究所 | Method for testing uniaxial compression elasticity modulus of inorganic binder stabilizing material |
| CN103822826A (en) * | 2013-07-22 | 2014-05-28 | 建研科技股份有限公司 | Method and instrument for detecting concrete compression strength with pulling escape method |
| CN104132846A (en) * | 2014-06-30 | 2014-11-05 | 安徽省建筑科学研究设计院 | Tube pile body concrete total cross section intensity examination method |
| CN104132846B (en) * | 2014-06-30 | 2016-03-23 | 安徽省建筑科学研究设计院 | A kind of tubular pile body concrete total cross-section ruggedness test method |
| CN104237489B (en) * | 2014-09-29 | 2016-01-20 | 华南理工大学 | A kind of method measuring tubular pile concrete self-healing performance |
| CN104237489A (en) * | 2014-09-29 | 2014-12-24 | 华南理工大学 | Method for measuring self-healing property of pipe pile concrete |
| CN105699116A (en) * | 2016-01-22 | 2016-06-22 | 中国长江三峡集团公司 | Concrete dam coring method |
| CN105699116B (en) * | 2016-01-22 | 2018-03-27 | 中国长江三峡集团公司 | A kind of concrete dam coring method |
| CN105807007A (en) * | 2016-05-04 | 2016-07-27 | 广州建设工程质量安全检测中心有限公司 | Drilled core method detection system and detection method thereof |
| CN106226119A (en) * | 2016-07-20 | 2016-12-14 | 辽宁省水利水电科学研究院 | A kind of concrete undisturbed harvester |
| CN106226119B (en) * | 2016-07-20 | 2023-07-04 | 辽宁省水利水电科学研究院有限责任公司 | Concrete undisturbed sample collection system |
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