CN106400857B - For the model equipment and method of the inaccessible degree of soil plug in in-site measurement opening pile - Google Patents
For the model equipment and method of the inaccessible degree of soil plug in in-site measurement opening pile Download PDFInfo
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- CN106400857B CN106400857B CN201611157439.0A CN201611157439A CN106400857B CN 106400857 B CN106400857 B CN 106400857B CN 201611157439 A CN201611157439 A CN 201611157439A CN 106400857 B CN106400857 B CN 106400857B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
Abstract
The present invention relates to a kind of model equipments and method for the inaccessible degree of soil plug in in-site measurement opening pile, its device includes test pile, anchoring pile, datum line beam and counter-force slot, there is opening in the lower end of the test pile, bearing sheet is fixed at the top of the test pile, jack is set on the bearing sheet, the top of the jack is equipped with load transducer, the top of the jack is against the lower face of the counter-force slot, magnetic stand is provided on the horizontal reference beam, it installs to measure the electronic centigrade scale of the bearing sheet displacement on the magnetic stand, the load transducer is connected with numerical value dynamometer, the test pile is equipped with preformed hole, the test pile is internally provided with interior iron ball, the interior iron ball is connected with cord, the cord is connected through preformed hole and with the outer iron ball outside test pile.Simple structure of the present invention, operation is easy, convenience in transport and handling, low to the requirement of required experimental enviroment, can determine that the opening pile occlusion degree under all kinds of soil properties.
Description
Technical field
The present invention relates to geotechnical engineering pile foundation field, more specifically to one kind in in-site measurement opening pile
The model equipment and method of the inaccessible degree of soil plug.
Background technology
Pile foundation is widely used under soft layer area and skyscraper, and type is divided into steel-pipe pile, concrete prefabricated
Stake, the pile pile of different materials are all divided into closing pile and opening pile.Existing research open-end pipe pile soil plug effect uses scene more
In-situ test, but actual needs of the field test due to meet engineering in the future, often invest it is huge and try grind during by
All larger in various test parameters, the equipment taken will be more complicated, and experiment is difficult to be in full swing, in the case, live mould
Type experiment can save substantial amounts of human and material resources and financial resources, and due to being field test, obtained result also complies with actual conditions,
This brings larger advantage to the solution of problem.Piling equipment, counterforce device and the soil at scene fill in height measuring device and are frequently not
It is exactly complicated for operation that volume is larger, and rear current cost is higher, spends the time more, installation is complicated.
The content of the invention
The technical problem to be solved in the present invention is, provide a kind of easy disassembly, experimentation cost it is low for in-site measurement
The model equipment and method of the inaccessible degree of soil plug in opening pile.
The technical solution adopted by the present invention to solve the technical problems is：Construction is a kind of for soil in in-site measurement opening pile
The model equipment of the inaccessible degree of plug, including test pile, anchoring pile, datum line beam and counter-force slot, the test pile be located at two anchoring piles it
Between, the counter-force slot and datum line beam are mounted on the anchoring pile, and the datum line beam is located at below counter-force slot, under the test pile
There is opening at end, and bearing sheet is fixed at the top of the test pile, jack, the top of the jack are set on the bearing sheet
Equipped with load transducer, the top of the jack is against the lower face of the counter-force slot, is provided on the horizontal reference beam
Magnetic stand, installation is for measuring the electronic centigrade scale of the bearing sheet displacement, the load transducer on the magnetic stand
Be connected with numerical value dynamometer, the test pile is equipped with preformed hole, and the test pile is internally provided with interior iron ball, the interior iron ball with
Cord connects, and the cord is connected through preformed hole and with the outer iron ball outside test pile.
In said program, the counter-force slot is equipped with rectangular opening, and the anchoring pile passes through rectangular opening, and the anchoring pile passes through support
Lock and caging bolt are fixed, and the support lock includes four tablets, and the both ends of the tablet are equipped with crotch, and one end is fixed on counter-force
On slot, the other end is hooked in anchoring pile top open part, and the caging bolt is fixed on the anchoring pile, and the caging bolt lower end is supported
Firmly counter-force slot.
In said program, the bearing sheet is welded on the test pile.
In said program, the interior iron ball and outer iron ball are solid iron ball.
In said program, the datum line beam is fixed on by platform bolt on the anchoring pile.
The method of the inaccessible degree of soil plug, comprises the following steps in a kind of in-site measurement opening pile：
The model equipment for the inaccessible degree of soil plug in in-site measurement opening pile in S1, assembling claim 1；By anchoring pile
It is fixed in soil, is made marks with marking pen on test pile along pile body every 100mm；
S2, stretch cord and have interaction force between interior iron ball and outer iron ball, measure out the outer cord of test pile with a yardstick
Length Ls；
S3, by jack by test pile press-in soil, test pile often buries 100mm, repeats step S2 and measures test pile
The length L of outer cordsn；Soil plug height change H=Lsn-Ls, the filling rate IFR=dL that soil is filled in is calculateds/100×100
(%)；
The loading force of jack is measured during S4, jack pressurization by numerical value dynamometer, passes through electronic centigrade scale
Measure the displacement deflection of experiment stake top；
The ultimate vertical bearing capacity of S5, measurement with the long opening pile of similary stake footpath, stake and closing pile, and be compared.
Implement the model equipment and method for the inaccessible degree of soil plug in in-site measurement opening pile of the present invention, have following
Advantageous effect：
1st, simple structure of the present invention, operation is easy, convenience in transport and handling, low to the requirement of required experimental enviroment, can determine that
Opening pile occlusion degree under all kinds of soil properties.
2nd, bearing sheet can provide larger instrument workbench face, be conveniently operated.
3rd, the mode of the fixed counter-force slot of support lock is simple and convenient, allows counter-force slot that can preferably be fixed on institute before providing counter-force
Position is needed, while is removed and installed conveniently.
4th, hanging set up of datum line beam can allow magnetic stand hanging, avoid earth shock and percentage meter reading is done
It disturbs.
5th, counter-force slot will not generate big deformation by caging bolt /V while larger counter-force is provided.
Description of the drawings
Below in conjunction with accompanying drawings and embodiments, the invention will be further described, in attached drawing：
Fig. 1 is structure diagram of the present invention for the model equipment of the inaccessible degree of soil plug in in-site measurement opening pile；
Fig. 2 is the structure diagram of datum line beam；
Fig. 3 is the structure diagram of counter-force slot.
Specific embodiment
In order to which the technical features, objects and effects to the present invention are more clearly understood, now compare attached drawing and be described in detail
The specific embodiment of the present invention.
As shown in Figure 1-Figure 3, include in the present invention for the model equipment of the inaccessible degree of soil plug in in-site measurement opening pile
Test pile 1, anchoring pile 2, counter-force slot 3, caging bolt 4, support lock 5, datum line beam 6, platform bolt 7, load transducer 8, jack
9th, bearing sheet 10, magnetic stand 11, electronic centigrade scale 12, test pile preformed hole 13, interior iron ball 14, cord 15, digital force-measuring instrument
16th, soil plug 17, outer iron ball 18 in stake.
At interval, one meter of two points squeeze into two anchoring piles 2, and anchoring pile 2 is seamless steel pile pile, and intensity is higher, are used to support anti-
Power apparatus squeezes into test pile 1 in two 2 centre places of anchoring pile, and three piles is kept to be located on the same line, 3 He of counter-force slot
Datum line beam 6 is mounted on anchoring pile 2.Stake is upright when during squeezing into the embedded depth of this three pile and stake being controlled to bury
Yu Tuzhong.1 one end of test pile is opening, and the soil body can enter during piling.
The top of test pile 1 is fixed with bearing sheet 10, and jack 9 is set on bearing sheet 10, and the top of jack 9 is equipped with lotus
Set sensor 8, the top of jack 9 are against the lower face of counter-force slot 3, magnetic stand 11, magnetic force are provided on horizontal reference beam 6
It installs to measure the electronic centigrade scale 12 of 10 displacement of bearing sheet on gauge stand 11.Hanging magnetic stand 11 can cause electronics percentage
12 reading of table will be more accurate, reduces the interference of external condition.Load transducer 8 is connected with numerical value dynamometer 16, can be surveyed
Measure the loading force of jack 9, the application of control load.
Test pile 1 is equipped with preformed hole 13, and test pile 1 is internally provided with interior iron ball 14, and interior iron ball 14 is connected with cord 15, carefully
Rope 15 is connected through preformed hole 13 and with the outer iron ball 18 outside test pile 1.Interior iron ball 14 and outer iron ball 18 are solid iron ball.
The height of soil plug 17 can be measured by interior iron ball 14, outer iron ball 18 and cord 15.
Datum line beam 6 is located at 3 lower section of counter-force slot, and datum line beam 6 is fixed on by platform bolt 7 on anchoring pile 2.Counter-force slot 3 is slot
Steel shape can provide larger counter-force without being deformed, and channel steel bottom both ends are provided with rectangular opening, square in symmetric position
The short side dimension in shape hole should be greater than the diameter of anchoring pile 2.Anchoring pile 2 passes through rectangular opening, and anchoring pile 2 is solid by supporting lock 5 and caging bolt 4
Fixed, support lock 5 is stated including four tablets, and the both ends of tablet are equipped with crotch, and one end is fixed on counter-force slot 3, and the other end is hooked in anchor
2 top open parts of stake, caging bolt 4 are fixed on anchoring pile 2, and 4 lower end of caging bolt props up counter-force slot 3, to limit counter-force slot 3
It is vertically movable, larger counter-force is provided.
Bearing sheet 10 is made, can be held during piling is buried using long 150mm and width 100mm, the steel plate of thick 15mm
By all impacts without generating excessive deformation, while that the other instruments on bearing sheet 10 is enabled to be in is same for larger area
On axis, be conducive to the accuracy of experiment.
Datum line beam 6 by anchoring pile 2 reserve hole after, can suspension frame be arranged on 1 both ends of test pile, convenient for the frame of magnetic stand 11
If providing basis to the reading accuracy of dial gauge 12, it can utmostly reduce influence of the ground surface vibration to 12 reading of dial gauge.
The present invention also provides a kind of methods of the inaccessible degree of soil plug in in-site measurement opening pile, comprise the following steps：
The model equipment for the inaccessible degree of soil plug in in-site measurement opening pile in S1, assembling claim 1；By anchoring pile
It is fixed in soil, is made marks with marking pen on test pile along pile body every 100mm；
S2, stretch cord and have interaction force between interior iron ball and outer iron ball, measure out the outer cord of test pile with a yardstick
Length；
S3, by jack by test pile press-in soil, test pile often buries 100mm, repeats step S2 and measures test pile
The length of outer cord；The value added of cord length is the growth height L of soil plugs, the filling rate IFR=that soil is filled in is calculated
dLs/ 100 × 100 (%)；.
The loading force of jack is measured during S4, jack pressurization by numerical value dynamometer, passes through electronic centigrade scale
Measure the displacement deflection of experiment stake top；
The ultimate vertical bearing capacity of S5, measurement with the long opening pile of similary stake footpath, stake and closing pile, and be compared.
The present invention provides a specific measurement embodiment is as follows：
Using apparatus of the present invention, some row are carried out for the distinctive gray structure clay in China coastal area and have been open
Soil plug height in-site measurement experiment in stake.During experiment, the measurement of multigroup Model Pile has been carried out.Such as：Measure a stake footpath
The soil plug height change situation of 40mm, the steel-pipe pile of the long 1200mm of stake during piling.On pile body one is done every 100mm
Mark is 11 group echos, the high unearthed face 100mm of stake in total.For the measurement of origin test pile, every group of soil plug height for 102,
94、83、76、72、61、76、63、60、58、57(mm)。
According to formula IFR=dLs/ 100 × 100 (%) acquire the inaccessible degree of soil plug in stake, the final IFR of this test pile
It is not entirely shut close to 60%, measures similary stake footpath further according to scene and the long opening pile ultimate vertical bearing capacity of stake is
6.1kN, and the ultimate vertical bearing capacity of closing pile is 7.5kN, the bearing capacity of opening pile is significantly less than closing pile, when soil plug in stake
When entirely shutting, it is believed that the ultimate bearing capacity of opening pile is equal to the bearing capacity of closing pile, and the two numerical value difference is little.This experiment
Difference is larger between the bearing capacity of stake, also can obtain according to IFR, and soil plug, which is in, in stake does not entirely shut.
The embodiment of the present invention is described above in conjunction with attached drawing, but the invention is not limited in above-mentioned specific
Embodiment, above-mentioned specific embodiment is only schematical rather than restricted, those of ordinary skill in the art
Under the enlightenment of the present invention, present inventive concept and scope of the claimed protection are not being departed from, can also made very much
Form, these are belonged within the protection of the present invention.
Claims (5)
1. a kind of model equipment for the inaccessible degree of soil plug in in-site measurement opening pile, including test pile, anchoring pile, datum line beam and
Counter-force slot, the test pile are located between two anchoring piles, and the counter-force slot and datum line beam are mounted on the anchoring pile, the benchmark
Beam is located at below counter-force slot, and there is opening in the lower end of the test pile, which is characterized in that is fixed with cushion cap at the top of the test pile
Plate sets jack on the bearing sheet, and the top of the jack is equipped with load transducer, and the top of the jack is against
The lower face of the counter-force slot is provided with magnetic stand on the datum line beam, and installation is described for measuring on the magnetic stand
The electronic centigrade scale of bearing sheet displacement, the load transducer are connected with numerical value dynamometer, and the test pile is equipped with preformed hole,
The test pile is internally provided with interior iron ball, and the interior iron ball is connected with cord, the cord through preformed hole and with positioned at experiment
Outer iron ball connection outside stake, the counter-force slot are equipped with rectangular opening, and the anchoring pile passes through rectangular opening, and the anchoring pile is locked by supporting
It is fixed with caging bolt, the support lock includes four tablets, and the both ends of the tablet are equipped with crotch, and one end is fixed on counter-force slot
On, the other end is hooked in anchoring pile top open part, and the caging bolt is fixed on the anchoring pile, and the caging bolt lower end props up
Counter-force slot.
2. the model equipment according to claim 1 for the inaccessible degree of soil plug in in-site measurement opening pile, feature exists
In the bearing sheet is welded on the test pile.
3. the model equipment according to claim 1 for the inaccessible degree of soil plug in in-site measurement opening pile, feature exists
In the interior iron ball and outer iron ball are solid iron ball.
4. the model equipment according to claim 1 for the inaccessible degree of soil plug in in-site measurement opening pile, feature exists
In the datum line beam is fixed on by platform bolt on the anchoring pile.
5. a kind of method of the inaccessible degree of soil plug in in-site measurement opening pile, which is characterized in that comprise the following steps：
The model equipment for the inaccessible degree of soil plug in in-site measurement opening pile in S1, assembling claim 1；Anchoring pile is fixed
In soil, made marks with marking pen on test pile along pile body every 100mm；
S2, stretch cord and have interaction force between interior iron ball and outer iron ball, measure out the length of the outer cord of test pile with a yardstick
Ls；
S3, by jack by test pile press-in soil, test pile often buries 100mm, repeat step S2 measure it is thin outside test pile
The length L of ropesn；Soil plug height change H=Lsn-Ls, the filling rate IFR=dL that soil is filled in is calculateds/ 100 × 100 (%)；
The loading force of jack is measured during S4, jack pressurization by numerical value dynamometer, is measured by electronic centigrade scale
Test the displacement deflection of stake top；
The ultimate vertical bearing capacity of S5, measurement with the long opening pile of similary stake footpath, stake and closing pile, and be compared.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611157439.0A CN106400857B (en) | 2016-12-15 | 2016-12-15 | For the model equipment and method of the inaccessible degree of soil plug in in-site measurement opening pile |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611157439.0A CN106400857B (en) | 2016-12-15 | 2016-12-15 | For the model equipment and method of the inaccessible degree of soil plug in in-site measurement opening pile |
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| Publication Number | Publication Date |
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| CN106400857A CN106400857A (en) | 2017-02-15 |
| CN106400857B true CN106400857B (en) | 2018-05-29 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106836317B (en) * | 2017-02-24 | 2018-07-03 | 同济大学 | A kind of pile sinking model test apparatus for considering soil plug effect and its application |
| CN106884441B (en) * | 2017-04-11 | 2022-08-23 | 青岛理工大学 | Visual uncovered double-walled model tubular pile test device |
| CN110243272B (en) * | 2019-07-12 | 2021-01-29 | 福州大学 | Test device and method for measuring height of suction foundation penetration soil plug and water plug |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2284673B (en) * | 1993-12-08 | 1997-01-08 | Precision Monitoring & Control | Pile-testing apparatus |
| GB2429059B (en) * | 2005-07-29 | 2008-07-30 | Peter Hammond | Soil testing apparatus |
| CN102587423B (en) * | 2012-03-02 | 2014-04-16 | 中国石油大学(华东) | Test method of depth testing device for driven type soil plugs of steel pipe piles of ocean platforms |
| CN205224129U (en) * | 2015-12-21 | 2016-05-11 | 武汉科技大学 | Single pile basis vertical bearing capacity's experiment detection device |
| CN105424913B (en) * | 2015-12-29 | 2017-04-19 | 中国科学院武汉岩土力学研究所 | Test apparatus for simulating soil plugging effect generated in pile sinking process of open tube pile |
| CN105862941A (en) * | 2016-05-24 | 2016-08-17 | 武汉科技大学 | Model device and method for measuring time effect of bearing capacity of pile foundations on site |
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| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
Inventor after: Tang Bin Inventor after: Zhou Yajie Inventor after: Fei Jianwu Inventor after: Ruan Yang Inventor before: Zhou Yajie Inventor before: Tang Bin Inventor before: Fei Jianwu |
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