CN105019485A - Static load test detection method for foundation pit excavation pile foundation - Google Patents
Static load test detection method for foundation pit excavation pile foundation Download PDFInfo
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- CN105019485A CN105019485A CN201510490250.2A CN201510490250A CN105019485A CN 105019485 A CN105019485 A CN 105019485A CN 201510490250 A CN201510490250 A CN 201510490250A CN 105019485 A CN105019485 A CN 105019485A
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Abstract
The invention relates to a static load test detection method for a foundation pit excavation pile foundation. According to the static load test detection method for the foundation pit excavation pile foundation, test pile data of the pile foundation designed elevation position can be accurately checked and the true mechanical characteristics of a pile body are acquired. According to the technical scheme, the method includes the steps that filling pile hole forming and construction are preformed in the pile foundation position on the ground of a planned site, when construction is performed to the designed elevation corresponding to the excavation depth of a foundation pit, a stress detector is embedded in the section of the pile body, and displacement meters are embedded in the side face of the pile body; broaching is performed on a stratum above the designed elevation of the pile foundation, the hole diameter is enlarged to be not smaller than 150 mm, an inner casing pipe and an outer casing pipe are sent, following filling construction of the pile foundation is preformed in the inner casing pipe, and materials are poured to the elevation of the ground of the planned site till filling pile construction is finished; and in the pile foundation static load detection process, an upper load is applied to the top of the filled pile on the ground of the planned site, welding angle steel is cut, and therefore the inner casing pipe and the outer casing pipe cannot make contact with each other.
Description
Technical field
The present invention relates to a kind of excavation of foundation pit dead load test on pile foundation detection method.Be applicable to the boring of the deep big foundation pit engineering pile foundation engineering of Deep Thick Soft Ground, tube-sinking cast-in-situ pile vertical compression and anti-pulling capacity detect.
Background technology
In recent years, the feature of engineering construction field is that depth of building is more and more higher, span is increasing, foundation depth is more and more darker, the single-column maximum axial load of basis end face is also increasing, large diameter borehole, tube-sinking cast-in-situ pile quantity required also increase thereupon, Pile Diameter and buried depth also increase thereupon, its Vertical Bearing Capacity is more and more important, vertical compression and anti-pulling capacity must carry out synthetic determination according to test pile result, and then instruct pile foundation engineering to design, therefore the engineering problem such as the dead load test on pile foundation faced construction and detection method is comparatively outstanding.
In the pile foundation engineering having deep big foundation pit, due to the requirement such as duration, technology, be generally and first carry out pile foundation construction planning to build place, after carry out the design elevation excavation of deep big foundation pit again.Do not carry out excavation of foundation pit after pile foundation construction before, namely need to carry out static load test pile, to determine whether bearing capacity of pile foundation meets design requirement.
But bearing capacity of pile foundation actual value should at excavation of foundation pit to foundation ditch bottom surface, carry out test pile at Pile Foundations Design absolute altitude end face (at the bottom of corresponding Foundation Pit absolute altitude) to obtain, owing to not excavating the side friction impact of the soil body, cause the resistance to compression of pile foundation and anti-pulling capacity all bigger than normal compared with actual value.If foundation depth is comparatively dark, the engineering geology better performances on stratum, during test pile, the load transfer law of pile foundation will change, and bearing capacity error will increase, relatively dangerous for engineering.The excavation of foundation pit degree of depth as darker in East China is more than 35m, and stake end embedded depth, more than 80m, if designed by the test pile bearing capacity before not excavating, just there will be the risk of buildings pile resistance to compression or anti-pulling capacity deficiency, brings larger potential safety hazard.
Some engineering staffs consider the impact of above-mentioned factor, provide some solutions, as disclosed " boring static load test bilayer sleeve " (201020659539.5), it eliminates the method for the high stratum side friction impact of stake top mark for arranging certain measure on top, excavation of foundation pit stratum, but its key issue do not considered is: 1, measured be the data such as the payload values of not excavating front stake top construction elevation and shift value, its test value contains the compressed value of the above pile body of Pile Foundations Design absolute altitude, do not represent the true mechanical characteristic of effective pile foundation, the Stress and displacement of design of pile top elevation location does not have measured data, although the side friction that 2 can eliminate upper formation, the Ultimate Bearing Capacity obtained, fails to consider the impact of pile body deadweight on effective pile body of more than Pile Foundations Design absolute altitude.
Summary of the invention
The technical problem to be solved in the present invention is: provide a kind of excavation of foundation pit dead load test on pile foundation detection method, to play Precision Test Pile Foundations Design absolute altitude place test pile data, obtains the true mechanical characteristics of pile body.
The technical solution adopted in the present invention is: excavation of foundation pit dead load test on pile foundation detection method, is characterized in that comprising the following steps:
1, pouring pile hole and construction is carried out in the pile foundation position of planning to build earth's surface, place, when constructing to Pile Foundations Design absolute altitude, when namely corresponding to the cutting depth of foundation ditch, at the pre-buried stressometer of pile body section, at the pre-buried displacement meter in pile body side;
2, described stress is taken into account displacement meter to be connected by data wire, and earth's surface, place is planned to build in data wire extraction, be connected with computer, so that the static load of pile foundation reading peg Ji Shejibiaogaochu detects data;
3, carry out Pile Foundations Design absolute altitude again with the reaming of overlying strata, borehole enlargement is not less than 150mm, and transfers inner sleeve and outer tube, carries out the pouring construction of follow-up pile foundation in inner sleeve, builds to planning to build earth's surface, place elevation until filling pile construction is complete;
The bottom of above-mentioned inner sleeve and outer tube is to Pile Foundations Design absolute altitude place, and the gap between inside and outside sleeve pipe is not less than 50mm, and the top of inside and outside sleeve pipe is welded to connect by angle steel;
4, when static load of pile foundation detects, upper load is applied at the castinplace pile top of planning to build earth's surface, place, and the angle steel of cutting welding, make between inside and outside sleeve pipe contactless;
5, the data of Pile Foundations Design absolute altitude place's stressometer and displacement meter are read by computer, record the Stress and displacement feature of effective pile foundation, and the vertical load above for Pile Foundations Design absolute altitude pile body weight is thought of as vertically downward, during compressive static load test, upper load need add pile body weight on it, during resistance to plucking static loading test, upper load need deduct pile body weight on it.
The invention has the beneficial effects as follows: 1, consider Pile Foundations Design absolute altitude above pile foundation own wt value, this part is also as top static load value; 2, stress value and the shift value at Pile Foundations Design absolute altitude place can be obtained, but not only have stress value and the shift value on stake top, earth's surface place, can read the Mechanical Data of reflection Practical Project stake; 3, adopt the mode that double-jacket tube and pre-buried stress, displacement meter are combined, operability and applicability strong, accuracy is high, has higher application value.
Accompanying drawing explanation
Fig. 1 is vertical cross-sectional of the present invention.
Detailed description of the invention
As shown in Figure 1, the static loading test detection method of the present embodiment comprises the following steps:
1, castinplace pile 2 pore-forming and construction is carried out in the pile foundation position of planning to build earth's surface, place 1, when constructing to Pile Foundations Design absolute altitude 3, when namely corresponding to the cutting depth of foundation ditch 4, at the pre-buried stressometer 5 of pile body section, the pre-buried displacement meter 6 in pile body side;
2, described stressometer 5 and displacement meter 6 are connected by data wire 7, and earth's surface, place 1 is planned to build in data wire 7 extraction, be connected with computer 8, so that the static load of pile foundation reading peg base design elevation 3 place detects data;
3, Pile Foundations Design absolute altitude 3 is carried out again with the reaming of overlying strata 9, borehole enlargement is not less than 150mm, and transfer inner sleeve 10 and outer tube 11, in inner sleeve 10, carrying out the pouring construction of follow-up pile foundation, building to planning to build earth's surface, place 1 elevation until castinplace pile 2 is constructed complete;
The bottom of above-mentioned inner sleeve 10 and outer tube 11 is supported to Pile Foundations Design absolute altitude 3 place, and the spacing between inside and outside sleeve pipe should be greater than 50mm, and ensure between inside and outside sleeve pipe smooth without friction, the top of inside and outside sleeve pipe is welded to connect by angle steel 12;
4, when static load of pile foundation detects, upper load 13 is applied at castinplace pile 2 top of planning to build earth's surface, place 1, and the angle steel 12 of cutting welding, make between inside and outside sleeve pipe contactless, now inner sleeve 10 conjugates with pile body, outer tube 11 has then cut off castinplace pile 2 and the contact on stratum 9, can play the effect eliminating upper formation 9 side friction;
5, the data of Pile Foundations Design absolute altitude 3 place stressometer 5 and displacement meter 6 are read by computer 8, record the Stress and displacement feature of effective pile foundation, and vertical load Pile Foundations Design absolute altitude more than 3 pile body weight is thought of as vertically downward, during compressive static load test, upper load 13 need add pile body weight on it, during resistance to plucking static loading test, upper load (oppositely) 13 need deduct pile body weight on it.
To sum up, pile foundation compressive ultimate bearing capacity is: during the state that reaches capacity, the upper load 13 applied adds Pile Foundations Design absolute altitude more than 3 pile body weight, and corresponding shift value is that the data reading displacement meter 6 surveyed by computer 8, and corresponding Internal forces is that the data reading stressometer 5 surveyed by computer 8; Same principle, pile foundation CAPO test is: during the state that reaches capacity, and the upper load (oppositely) 13 of applying deducts the pile body weight of Pile Foundations Design absolute altitude more than 3.The load-displacement obtained with this-stress mornitoring data are pile foundation authentic testing value.
Claims (1)
1. an excavation of foundation pit dead load test on pile foundation detection method, is characterized in that comprising the following steps:
1.1, castinplace pile (2) pore-forming and construction is carried out in the pile foundation position of planning to build earth's surface, place (1), when construction is to Pile Foundations Design absolute altitude (3), when namely corresponding to the cutting depth of foundation ditch (4), at the pre-buried stressometer of pile body section (5), in the pre-buried displacement meter in pile body side (6);
1.2, described stressometer (5) and displacement meter (6) are connected by data wire (7), and earth's surface, place (1) is planned to build in data wire (7) extraction, be connected with computer (8), so that the static load of pile foundation reading peg base design elevation (3) place detects data;
1.3, Pile Foundations Design absolute altitude (3) is carried out again with the reaming of overlying strata (9), borehole enlargement is not less than 150mm, and transfer inner sleeve (10) and outer tube (11), in inner sleeve (10), carrying out the pouring construction of follow-up pile foundation, building to planning to build earth's surface, place (1) elevation until castinplace pile (2) is constructed complete;
The bottom of above-mentioned inner sleeve (10) and outer tube (11) is to Pile Foundations Design absolute altitude (3) place, and the gap between inside and outside sleeve pipe is not less than 50mm, and the top of inside and outside sleeve pipe is welded to connect by angle steel (12);
1.4, when static load of pile foundation detects, upper load (13) is applied at castinplace pile (2) top of planning to build earth's surface, place (1), and the angle steel (12) of cutting welding, make between inside and outside sleeve pipe contactless;
1.5, the data of Pile Foundations Design absolute altitude (3) place stressometer (5) and displacement meter (6) are read by computer (8), record the Stress and displacement feature of effective pile foundation, and the vertical load above for Pile Foundations Design absolute altitude (3) pile body weight is thought of as vertically downward, during compressive static load test, upper load (13) need add pile body weight on it, during resistance to plucking static loading test, upper load (13) need deduct pile body weight on it.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106592652A (en) * | 2016-12-27 | 2017-04-26 | 中船第九设计研究院工程有限公司 | Test method for ultimate bearing capacity of cast-in-situ bored uplift pile in deep foundation pit |
| CN108589808A (en) * | 2018-07-26 | 2018-09-28 | 大成科创基础建设股份有限公司 | Pile for prestressed pipe bearing capacity of pile tip test device |
| CN108643251A (en) * | 2018-06-26 | 2018-10-12 | 浙江理工大学 | A kind of pile foundation pulling resistance testing device and pullout tests method |
| CN109577387A (en) * | 2018-12-27 | 2019-04-05 | 深圳市建筑设计研究总院有限公司 | A kind of pile testing method and test pile structure |
| CN113622426A (en) * | 2021-08-19 | 2021-11-09 | 中国十七冶集团有限公司 | Pile top elevation control construction process for static pressure prestressed pipe pile test by non-pile cutting method |
| CN115233747A (en) * | 2022-07-13 | 2022-10-25 | 青岛理工大学 | Device and method for testing stress of micro steel pipe pile in miscellaneous filled stratum |
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| CN201933516U (en) * | 2010-12-15 | 2011-08-17 | 上海市基础工程有限公司 | Double-layer steel sleeve for drilled pile static load test |
| CN102720221A (en) * | 2012-06-29 | 2012-10-10 | 中国建筑第八工程局有限公司 | Double casing pipe and pile testing method for eliminating lateral frictional resistance of portion above top pile elevation of test pile |
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| CN101545270A (en) * | 2009-04-17 | 2009-09-30 | 上海隧道工程股份有限公司 | Double sleeve for pile foundation test and construction technique thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106592652A (en) * | 2016-12-27 | 2017-04-26 | 中船第九设计研究院工程有限公司 | Test method for ultimate bearing capacity of cast-in-situ bored uplift pile in deep foundation pit |
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| CN108643251A (en) * | 2018-06-26 | 2018-10-12 | 浙江理工大学 | A kind of pile foundation pulling resistance testing device and pullout tests method |
| CN108589808A (en) * | 2018-07-26 | 2018-09-28 | 大成科创基础建设股份有限公司 | Pile for prestressed pipe bearing capacity of pile tip test device |
| CN109577387A (en) * | 2018-12-27 | 2019-04-05 | 深圳市建筑设计研究总院有限公司 | A kind of pile testing method and test pile structure |
| CN113622426A (en) * | 2021-08-19 | 2021-11-09 | 中国十七冶集团有限公司 | Pile top elevation control construction process for static pressure prestressed pipe pile test by non-pile cutting method |
| CN115233747A (en) * | 2022-07-13 | 2022-10-25 | 青岛理工大学 | Device and method for testing stress of micro steel pipe pile in miscellaneous filled stratum |
| CN115233747B (en) * | 2022-07-13 | 2024-02-27 | 青岛理工大学 | Device and method for testing stress of miniature steel pipe pile in miscellaneous fill stratum |
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| CN105019485B (en) | 2017-03-01 |
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Effective date of registration: 20180509 Address after: No. 82, Hudong Road, Gulou District, Fuzhou, Fujian Province Patentee after: China Electric Power Construction Group aviation Port Construction Co., Ltd. Address before: 310014 Chao Wang Road, Xiacheng City, Hangzhou, Zhejiang Province, No. 22 Patentee before: Co., Ltd of East China Investigation and Design Institute of electricity Jian group of China |
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