CN103088850B - Cycle friction sleeve barrel device for evaluating periodic load pile side friction - Google Patents
Cycle friction sleeve barrel device for evaluating periodic load pile side friction Download PDFInfo
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- CN103088850B CN103088850B CN201310017631.XA CN201310017631A CN103088850B CN 103088850 B CN103088850 B CN 103088850B CN 201310017631 A CN201310017631 A CN 201310017631A CN 103088850 B CN103088850 B CN 103088850B
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- friction
- friction sleeve
- circulation
- pile side
- pusher
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Abstract
The invention discloses a cycle friction sleeve barrel device for evaluating periodic load pile side friction. A hollow shaft rod(1), an annular hydraulic cylinder (4), a pusher (5), a cycle friction sleeve barrel (7), a side wall friction barrel (9), a hole pressure filtering ring (11) and a cone probe (12) are arranged on the evaluation period load pile side friction cycle friction sleeve barrel device from up to down, wherein flexible pipes (2), the first cables (3.1) and the second cables (3.2) are arranged on the left side and the right side of the upper hollow shaft rod (1), the annular hydraulic cylinder (4) is connected on the lower portion of each of the flexible pipes (2), the pusher (5) is arranged below the annular hydraulic cylinder (4), a displacement sensor (6) is mounted on the pusher (5), the displacement sensor (6) is connected with the first cable (3.1), the cycle friction sleeve barrel (7) is arranged below the pusher (5), the cycle friction sleeve barrel (7) is connected with the second cable (3.2), a stainless steel spring (8) is attached to the inner side of the cycle friction sleeve barrel (7), the side wall friction barrel (9), the hole pressure filtering ring (11) and the cone probe (12) are arranged below the stainless steel spring (8) in sequence, and a hole water pressure sensor (10) is arranged in the inner part of the side wall friction barrel (9). The cycle friction sleeve barrel device for evaluating the periodic load pile side friction has the advantages of normal position, rapidness, accuracy, quantification and the like, and supplies an effective detecting tool to period load pile side friction and evaluation of soil body shear strength and the like.
Description
Technical field
The present invention relates to a kind of circulation friction sleeve static sounding element, belong to a kind of in geotechnical engineering field can original position, fast, accurately, the static sounding device of pile side friction and soil body shear strength under test period load quantitatively.
Background technology
Along with the development of world industry process, the application of pile foundation in the construction fields such as industry, traffic is more and more extensive.Pile foundation under certain condition is not only born the dead load that top-out transmits, also bearing the dynamic load of certain type simultaneously, as thering is the industrial premises pile foundation of crane, pile body must bear the cyclic loading that crane handling running brings in bearing factory building and crane girder etc. self dead load; Pile Foundation of Offshore Platforms plinth, except bearing upper brace load, also needs to bear the circulation impact load of ocean wave; The vehicular load that speedway bears itself is exactly a kind of loop cycle load.This just requires geotechnical engineering worker, and to the mechanical property of pile foundation under cyclic loading, there is a profound understanding, and wherein pile side friction is exactly a very important aspect.At present, the method for measuring pile side friction under cyclic load mainly contains two kinds, and one is theoretical calculation, and another kind is static sounding in-situ test method.Theoretical calculation common are estimation algorithm, the finite element numerical calculating etc. based on experience, although this method convenience of calculation exists more assumed condition and modifying factor, larger with the actual gap of engineering, the accuracy of result of calculation is poor.Static sounding in-situ testing technique refers to and utilizes pressure apparatus by the sounding rod indentation test soil layer with contact probe, throughput examining system is tested native static point resistance, side friction power, pore water pressure etc., can determine some basic physical mechanics properties of soil, as the allowable bearing etc. of native modulus of deformation, soil.Static sounding technology is the history of existing more than 80 year so far, is used widely in the world, has partly or entirely replaced probing and the sampling in engineering exploration.First China succeeded in developing electric measuring type static sounding and be applied to prospecting in nineteen sixty-five.Static sounding in-situ testing technique can, by analyzing the circulation load-bearing feature of feeler lever in the soil body, obtain the side friction of pile body at condition of similarity.
The present invention is based on conventional static cone penetration equipment, proposed a kind of in-situ test circulation friction ferrule element that can be quick, accurate, quantitative, for the quantitative assessment such as pile side friction, soil shear strength under cyclic loading provides effective tool.
Summary of the invention
Technical problem: the technical problem to be solved in the present invention is the in situ quantitation evaluation that cannot carry out pile side friction under cyclic loading for domestic, propose a kind of can be used for geotechnical engineering field can in situ quantitation evaluation cycle load under the circulation friction sleeve static sounding element of pile side friction.
Technical scheme: under a kind of evaluation cycle load of the present invention, the circulation friction sleeve cartridge of pile side friction is taking hollow axis pole as main body, be provided with flexible pipe and the first cable in the left and right sides on hollow axis pole top, the second cable, the below of flexible pipe is connected with annular hydraulic cylinder, the below of annular hydraulic cylinder is provided with pusher, displacement transducer is housed on pusher, displacement transducer is connected with the first cable, the below of pusher is circulation friction sleeve, circulation friction sleeve is connected with the second cable, the inwall of being close to circulation friction sleeve is provided with stainless steel spring, the below of stainless steel spring is disposed with sidewall friction cylinder, hole press filtration ring and circular cone probe, the inside of sidewall friction cylinder is provided with pore water pressure sensor.
The external diameter of hollow axis pole is 35.7mm.
The interior defeated hydraulic oil that has of flexible pipe, forms hydraulic top pushing device jointly with annular hydraulic cylinder and pusher, and the cyclic loading frequency that hydraulic top pushing device provides is 1Hz, and maximum displacement is 5mm, and precision is greater than 1/100mm.
The first cable is connected with displacement transducer, for measuring the displacement of circulation friction sleeve; The second cable is connected with circulation friction sleeve, for measuring the contact stress of circulation friction sleeve and the soil body.
Circulation friction sleeve is connected with stainless steel spring, and the surface area of circulation friction sleeve is 200cm
2, external diameter is 42.4mm, length is 150mm.
The surface area of sidewall friction cylinder is 150cm
2, length is 133.7mm.
The cone angle of circular cone probe is 60 °, and cone basal cross section amasss as 10cm
2.
The test degree of depth of each Cyclic Loading Test must not exceed 10m, and the cyclic loading number of times applying must not be less than 1000 times.
Beneficial effect: pile foundation not only will be born the dead load that superstructure transmits, also will bear the cycle dynamic load that crane load, ocean wave load and traffic loading etc. produce.Under quantitative assessment cyclic loading, the method for pile side friction mainly contains theoretical calculation and static sounding in-situ test method at present.Although theoretical calculation is simple, convenient, calculates hypothesis and the larger gap of engineering physical presence, result of calculation accuracy is poor, scarcely meets engineering design requirement.Static sounding in-situ test has continuously, accurately, the feature such as easily and fast, by analyzing the circulation load-bearing characteristic of feeler lever in soil, obtain pile body side friction under cyclic loading.
The invention solves domestic existing in-situ testing technique cannot quantitative assessment cyclic loading under the defect of pile side friction, can original position, continuously, the variation of pile side friction under quantitative assessment cyclic loading accurately.Make static sounding technology can more fully serve geotechnical engineering field.
Brief description of the drawings
Fig. 1 is the structural representation of device of the present invention.
Wherein have: hollow axis pole 1, flexible pipe 2, the first cables 3.1, the second cable 3.2, annular hydraulic cylinder 4, pusher 5, displacement transducer 6, circulation friction sleeve 7, stainless steel spring 8, sidewall friction cylinder 9, pore water pressure sensor 10, hole press filtration ring 11, circular cone probe 12.
Detailed description of the invention
Of the present invention a kind of can in situ quantitation evaluation cycle load under the circulation friction ferrule element of pile side friction, this element is provided with hollow axis pole from top to bottom, the left and right sides of hollow axis pole is provided with the cable of flexible pipe and two different purposes, the below of flexible pipe is connected with annular hydraulic cylinder, the below of annular hydraulic cylinder is provided with pusher, displacement transducer is installed on pusher, displacement transducer is connected with a cable, the below of pusher is circulation friction sleeve, circulation friction sleeve is connected with another root cable, the inwall of being close to circulation friction sleeve is provided with stainless steel spring, the below of stainless steel spring is disposed with sidewall friction cylinder, hole press filtration ring and circular cone probe, the inside of sidewall friction cylinder is provided with pore water pressure sensor.
The external diameter of described hollow axis pole is 35.7mm.
Described sidewall friction cylinder surface area is 150cm
2, length is 133.7mm, and the cone angle of circular cone probe is 60 °, and cone basal cross section amasss as 10cm
2.
The interior defeated hydraulic oil that has of described flexible pipe, with annular hydraulic cylinder and pusher composition hydraulic top pushing device.The cyclic loading frequency that hydraulic top pushing device provides is 1Hz, and maximum displacement is 5mm, and precision is greater than 1/100mm.
On described pusher, displacement transducer is housed, and is connected with data acquisition cable, composition displacement measuring means, for measuring the circulate change in displacement of friction cylinder of process of the test.Circulation friction sleeve gathers cable with another single data and is connected, and composition stress measuring equipment, for measuring process of the test circulation friction sleeve and the STRESS VARIATION that contacts the soil body around.
Described circulation friction sleeve is connected with stainless steel spring, and the surface area of circulation friction sleeve is 200cm
2, external diameter is 42.4mm, length is 150mm.
The test degree of depth of each Cyclic Loading Test must not exceed 10m, and the cyclic loading number of times applying must not be less than 1000 times.
Before cyclic loading test, by the feeler lever injection with circulation friction ferrule element to assigned address, until pore pressure dissipation completely after, start test and record the related datas such as sleeve displacement, stress and cylinder pressure value that rub that circulate.Result of the test is owing to being subject to the factor such as camber of spring, flexible pipe expansion to affect and must revise.By correlated results finishing analysis such as the displacement of revised circulation friction sleeve, sleeve lateral wall frictional resistance and hydraulic pressure, obtain pile body side friction under cyclic loading.
Claims (7)
1. the circulation friction sleeve cartridge of pile side friction under an evaluation cycle load, it is characterized in that this device is taking hollow axis pole (1) as main body, be provided with flexible pipe (2) and the first cable (3.1) in the left and right sides on hollow axis pole (1) top, the second cable (3.2), the below of flexible pipe (2) is connected with annular hydraulic cylinder (4), the below of annular hydraulic cylinder (4) is provided with pusher (5), displacement transducer (6) is housed on pusher (5), displacement transducer (6) is connected with the first cable (3.1), the below of pusher (5) is circulation friction sleeve (7), circulation friction sleeve (7) is connected with the second cable (3.2), the inwall of being close to circulation friction sleeve (7) is provided with stainless steel spring (8), the below of stainless steel spring (8) is disposed with sidewall friction cylinder (9), hole press filtration ring (11) and circular cone probe (12), the inside of sidewall friction cylinder (9) is provided with pore water pressure sensor (10).
2. the circulation friction sleeve cartridge of pile side friction under evaluation cycle load according to claim 1, the external diameter that it is characterized in that hollow axis pole (1) is 35.7mm.
3. the circulation friction sleeve cartridge of pile side friction under evaluation cycle load according to claim 1, it is characterized in that the interior defeated hydraulic oil that has of flexible pipe (2), jointly form hydraulic top pushing device with annular hydraulic cylinder (4) and pusher (5), the cyclic loading frequency that hydraulic top pushing device provides is 1Hz, maximum displacement is 5mm, and precision is greater than 1/100mm.
4. the circulation friction sleeve cartridge of pile side friction under evaluation cycle load according to claim 1, it is characterized in that the first cable (3.1) is connected with displacement transducer (6), for measuring the displacement of circulation friction sleeve (7); The second cable (3.2) is connected with circulation friction sleeve (7), for measuring the contact stress of circulation friction sleeve (7) and the soil body.
5. the circulation friction sleeve cartridge of pile side friction under evaluation cycle load according to claim 1, is characterized in that circulation friction sleeve (7) is connected with stainless steel spring (8), and the surface area of circulation friction sleeve is 200cm
2, external diameter is 42.4mm, length is 150mm.
6. the circulation friction sleeve cartridge of pile side friction under evaluation cycle load according to claim 1, the surface area that it is characterized in that sidewall friction cylinder (9) is 150cm
2, length is 133.7mm.
7. the circulation friction sleeve cartridge of pile side friction under evaluation cycle load according to claim 1, is characterized in that the cone angle of circular cone probe (12) is 60 °, and cone basal cross section amasss as 10cm
2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310017631.XA CN103088850B (en) | 2013-01-17 | 2013-01-17 | Cycle friction sleeve barrel device for evaluating periodic load pile side friction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310017631.XA CN103088850B (en) | 2013-01-17 | 2013-01-17 | Cycle friction sleeve barrel device for evaluating periodic load pile side friction |
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| Publication Number | Publication Date |
|---|---|
| CN103088850A CN103088850A (en) | 2013-05-08 |
| CN103088850B true CN103088850B (en) | 2014-09-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310017631.XA Expired - Fee Related CN103088850B (en) | 2013-01-17 | 2013-01-17 | Cycle friction sleeve barrel device for evaluating periodic load pile side friction |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104746538B (en) * | 2013-06-04 | 2016-08-24 | 天津大学 | In-situ measurement bucket foundation sinks the method passing through end resistance and frictional resistance |
| CN105547841B (en) * | 2015-12-11 | 2018-03-20 | 中国科学院武汉岩土力学研究所 | Confined pressure controllable rock side friction test device and its method |
| CN106906815B (en) * | 2017-03-08 | 2019-01-04 | 中交第二航务工程局有限公司 | Foundation bearing capacity and side friction measuring device and its application method |
| CN107100214A (en) * | 2017-06-16 | 2017-08-29 | 中交第航务工程勘察设计院有限公司 | Stake resistance simulation test device |
| CN111593717A (en) * | 2020-05-28 | 2020-08-28 | 东南大学 | Novel pore pressure static sounding device for pile foundation performance test |
| CN112097979B (en) * | 2020-08-28 | 2021-07-13 | 清华大学 | Method for measuring motion resistance of hydraulic cylinder of driving mechanism |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5587540A (en) * | 1994-02-01 | 1996-12-24 | Meyer; Robert D. | Soil sampling device with latch assembly having a variable circumferential shape |
| AU2001280587A1 (en) * | 2000-07-18 | 2002-01-30 | Georgia Tech Research Corporation | Multi-friction sleeve penetrometer apparatus and method |
| CN1234012C (en) * | 2003-03-25 | 2005-12-28 | 中国海洋大学 | Detector for solibody in-situ hole pressure and affecting depth under wave action |
| GB2443647A (en) * | 2006-11-10 | 2008-05-14 | Univ Belfast | Method and apparatus for determining the plastic limit of soil |
| CN102518106B (en) * | 2011-12-13 | 2014-01-08 | 东南大学 | Method for determining the lateral earth pressure based on the multi-functional piezocone penetration test probe |
| CN102839641A (en) * | 2012-08-27 | 2012-12-26 | 东南大学 | Nuclear density pore pressure static cone penetration test probe for testing density of soil mass |
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Granted publication date: 20140910 Termination date: 20170117 |