CN106400857A - Model device and method used for field measuring of blockage degree of opening pile interior soil plug - Google Patents
Model device and method used for field measuring of blockage degree of opening pile interior soil plug Download PDFInfo
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- CN106400857A CN106400857A CN201611157439.0A CN201611157439A CN106400857A CN 106400857 A CN106400857 A CN 106400857A CN 201611157439 A CN201611157439 A CN 201611157439A CN 106400857 A CN106400857 A CN 106400857A
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- pile
- opening
- test pile
- counter
- iron ball
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- 239000002689 soil Substances 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 60
- 238000012360 testing method Methods 0.000 claims abstract description 60
- 229910052742 iron Inorganic materials 0.000 claims abstract description 30
- 238000006073 displacement reaction Methods 0.000 claims abstract description 7
- 238000005259 measurement Methods 0.000 claims description 26
- 238000004873 anchoring Methods 0.000 claims description 21
- 239000007787 solid Substances 0.000 claims description 4
- 230000003993 interaction Effects 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 240000002853 Nelumbo nucifera Species 0.000 description 1
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 1
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000002592 echocardiography Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000002372 labelling Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention relates to a model device and method used for field measuring of the blockage degree of an opening pile interior soil plug. The device comprises a test pile, an anchor pile, a datum line beam and a counter-force groove. An opening is formed in the lower end of the test pile. A bearing sheet is fixed to the top of the test pile and provided with a jack. A load sensor is arranged on the top of the jack. The top end of the jack abuts against the lower end face of the counter-force groove. A magnetic force meter base is arranged on the datum line base and provided with an electronic dial indicator used for measuring the displacement of the bearing sheet. The load sensor is connected with a value force measuring instrument. The test pile is provided with a reserved hole. An inner iron ball is arranged in the test pile and connected with a thin rope. The thin rope penetrates the reserved hole and is connected with an outer iron ball located outside the test pile. The model device is simple in structure, easy to operate and convenient to transport, mount and dismount, the requirement for the needed testing environment is low, and the opening pile blockage degrees under various kinds of soil properties can be judged.
Description
Technical field
The present invention relates to Geotechnical Engineering pile foundation field, more particularly, it relates to a kind of be used in in-site measurement opening pile
The model equipment of the inaccessible degree of soil plug and method.
Background technology
Pile foundation is of many uses under soft layer area and skyscraper, and type is divided into steel-pipe pile, concrete prefabricated
Stake, the pile tube of different materials is all divided into closing pile and opening pile.Existing research open-end pipe pile soil plug effect many using scene
In-situ test, but field test be due to will meet being actually needed of engineering in the future, often invest huge and during trying to grind by
All larger in various test parameterss, the equipment taken will be more complicated, and test is difficult to be in full swing, in the case, live mould
Type test can save substantial amounts of human and material resources and financial resources, and due to being field test, the result obtaining also complies with practical situation,
This brings larger advantage to the solution of problem.The piling equipment at scene, counterforce device and soil plug height measuring device are frequently not
Volume is larger to be exactly complex operation, and the later stage is relatively costly, and the cost time is many, installs complicated.
Content of the invention
The technical problem to be solved in the present invention is, provide a kind of easy disassembly, experimentation cost low for in-site measurement
The model equipment of the inaccessible degree of soil plug and method in opening pile.
The technical solution adopted for the present invention to solve the technical problems is：Construction is a kind of to be used for soil in in-site measurement opening pile
The model equipment of the inaccessible degree of plug, includes test pile, anchoring pile, datum line beam and counter-force groove, described test pile positioned at two anchoring piles it
Between, described counter-force groove and datum line beam are arranged on described anchoring pile, and described datum line beam is located at below counter-force groove, under described test pile
There is opening at end, and the top of described test pile is fixed with bearing sheet, and described bearing sheet arranges jack, the top of described jack
It is provided with load transducer, the top of described jack is against the lower surface of described counter-force groove, and described horizontal reference beam is provided with
Magnetic stand, described magnetic stand is installed the electronic centigrade scale for measuring described bearing sheet displacement, described load transducer
Be connected with numerical value dynamometer, described test pile is provided with preformed hole, inside described test pile, be provided with interior iron ball, described interior iron ball with
Cord connects, and described cord is passed through preformed hole and is connected with the outer iron ball outside test pile.
In such scheme, described counter-force groove is provided with rectangular opening, and described anchor pole passes through rectangular opening, and described anchor pole passes through to support
Lock and caging bolt are fixed, and described support lock is stated including four tablets, and the two ends of described tablet are provided with crotch, and one end is fixed on instead
On power groove, the other end is hooked in anchoring pile top open part, and described caging bolt is fixed on described anchoring pile, described caging bolt lower end
Prop up counter-force groove.
In such scheme, described bearing sheet is welded on described test pile.
In such scheme, described interior iron ball and outer iron ball are solid iron ball.
In such scheme, described datum line beam is bolted on described anchor pole by platform.
In a kind of in-site measurement opening pile, the method for the inaccessible degree of soil plug, comprises 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, made marks every 100mm along pile body on test pile with marking pen；
S2, stretch cord to having 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, and repeat step S2 measures test pile
Length L of outer cordsn；Soil plug height change H=Lsn-Ls, calculate the filling rate IFR=dL of the plug that is uneartheds/100×100
(%)；
The loading force of jack is measured by numerical value dynamometer, by electronic centigrade scale during S4, jack pressurization
Record the displacement deflection of test pile stake top；
S5, measurement have the ultimate vertical bearing capacity of the long opening pile of same stake footpath, stake and closing pile, and are compared.
Implement model equipment and the method for filling in inaccessible degree for soil in in-site measurement opening pile of the present invention, have following
Beneficial effect：
1st, simple structure of the present invention, processing ease, convenient transport and handling, require to required experimental enviroment low, can determine that
Opening pile obturation degree under all kinds of soil properties.
2nd, bearing sheet can provide larger instrument work platformses face, convenient operation.
3rd, support the mode of the fixing counter-force groove of lock simple and convenient, allow counter-force groove can preferably be fixed on institute before providing counter-force
Need position, remove and install conveniently simultaneously.
4th, the hanging erection of datum line beam can allow magnetic stand hanging, it is to avoid earth shock is done to percentage meter reading
Disturb.
5th, counter-force groove is spacing by caging bolt, will not produce big deformation while providing larger counter-force.
Brief description
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing：
Fig. 1 is the structural representation that the present invention is used for the model equipment of the inaccessible degree of soil plug in in-site measurement opening pile；
Fig. 2 is the structural representation of datum line beam；
Fig. 3 is the structural representation of counter-force groove.
Specific embodiment
In order to be more clearly understood to the technical characteristic of the present invention, purpose and effect, now comparison accompanying drawing describes in detail
The specific embodiment of the present invention.
As shown in Figure 1-Figure 3, the model equipment being used for the inaccessible degree of soil plug in in-site measurement opening pile in the present invention includes
Test pile 1, anchoring pile 2, counter-force groove 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 pipe stake, and intensity is higher, anti-for supporting
Power apparatus, in the middle of two anchor poles, test pile 1 is squeezed in place, and keeps three piles to be located on the same line, counter-force groove 3 and base
Quasi- beam 6 is arranged on anchoring pile 2.Stake when controlling the embedded depth of this three pile and stake to bury during squeezing into will stand on
In soil.Test pile 1 one end is opening, and during piling, the soil body can enter.
The top of test pile 1 is fixed with bearing sheet 10, bearing sheet 10 arranges jack 9, the top of jack 9 is provided with lotus
Set sensor 8, the top of jack 9 is against the lower surface of counter-force groove 3, and horizontal reference beam 6 is provided with magnetic stand 11, magnetic force
Electronic centigrade scale 12 for measuring bearing sheet 10 displacement is installed on gauge stand 11.Hanging magnetic stand 11 can make dial gauge 12
Reading will be more accurate, reduces the interference of external condition.Load transducer 8 is connected with numerical value dynamometer 16, can measure thousand
The loading force on jin top 9, the applying of control load.
Test pile 1 is provided with preformed hole 13, is provided with interior iron ball 14 inside test pile 1, and interior iron ball 14 is connected with cord 15, carefully
Rope 15 is passed through preformed hole 13 and is connected 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 below counter-force groove 3, and datum line beam 6 is fixed on anchor pole by platform bolt 7.Counter-force groove 3 is channel-section steel
Shape, it can provide larger counter-force not to be deformed, and channel-section steel bottom two ends have rectangular opening in symmetric position, rectangle
The short side dimension in hole should be greater than the diameter of anchoring pile 2.Anchor pole passes through rectangular opening, and anchor pole passes through to support lock 5 and caging bolt 4 fixing,
Lock 5 is supported to state including four tablets, the two ends of tablet are provided with crotch, and one end is fixed on counter-force groove 3, and the other end is hooked in anchoring pile 2
Top open part, caging bolt 4 is fixed on anchoring pile 2, and caging bolt 4 lower end props up counter-force groove 3, to limit the perpendicular of counter-force groove 3
To movement, provide larger counter-force.
Bearing sheet 10 adopts long 150mm and wide 100mm, and the steel plate of thick 15mm is made, and can hold during piling is buried
All impacted and do not produced excessive deformation, the other instruments that the area being simultaneously sent to enables on bearing sheet 10 are in same
On axis, be conducive to the accuracy tested.
Behind the hole that datum line beam 6 is reserved by anchoring pile 2, can vacantly set up and test pile 1 two ends, be easy to the frame of magnetic stand 11
If providing basis to the reading accuracy of dial gauge 12, can at utmost reducing the impact to dial gauge 12 reading for the ground surface vibration.
Present invention also offers a kind of method that in in-site measurement opening pile, soil fills in inaccessible degree, 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, made marks every 100mm along pile body on test pile with marking pen；
S2, stretch cord to having 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, and repeat step S2 measures test pile
The length of outer cord；The value added of cord length is the growth height L of soil plugs, calculate the filling rate IFR=of the plug that is unearthed
dLs/ 100 × 100 (%)；.
The loading force of jack is measured by numerical value dynamometer, by electronic centigrade scale during S4, jack pressurization
Record the displacement deflection of test pile stake top；
S5, measurement have the ultimate vertical bearing capacity of the long opening pile of same stake footpath, stake and closing pile, and are compared.
The invention provides a concrete measurement embodiment is as follows：
This device has carried out soil plug in some row opening piles based on China coastal area distinctive gray structure clay
Height in-site measurement is tested.In process of the test, carry out the measurement of many group model dresses.For example：One stake footpath 40mm, stake of measurement is long
Soil plug height change situation during piling for the steel-pipe pile of 1200mm.Do a labelling every 100mm on pile body, altogether
Do 11 group echos, the high unearthed face 100mm of stake.For this with test pile measurement, every group soil plug height be 102,94,83,76,
72、61、76、63、60、58、57(mm)
According to formula IFR=dLs/ 100 × 100 (%) try to achieve the inaccessible degree of soil plug in stake, the final IFR of this test pile
Close to 60%, it is not entirely shut, record same 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
It is believed that the ultimate bearing capacity of opening pile is equal to the bearing capacity of closing pile when entirely shutting, both numerical value difference are little.This test
Between the bearing capacity of stake, difference is larger, also be can get according to IFR, and in stake, soil plug is in and does not entirely shut.
Above in conjunction with accompanying drawing, embodiments of the invention are described, but the invention is not limited in above-mentioned concrete
Embodiment, above-mentioned specific embodiment is only schematically, rather than restricted, those of ordinary skill in the art
Under the enlightenment of the present invention, in the case of without departing from present inventive concept and scope of the claimed protection, also can make a lot
Form, these belong within the protection of the present invention.
Claims (6)
1. in a kind of opening pile for in-site measurement the inaccessible degree of soil plug model equipment, including test pile, anchoring pile, datum line beam and
Counter-force groove, described test pile is located between two anchoring piles, and described counter-force groove and datum line beam are arranged on described anchoring pile, described benchmark
Beam is located at below counter-force groove, and the lower end of described test pile has opening it is characterised in that the top of described test pile is fixed with cushion cap
Plate, described bearing sheet arranges jack, and the top of described jack is provided with load transducer, and the top of described jack is against
The lower surface of described counter-force groove, described horizontal reference beam is provided with magnetic stand, described magnetic stand is installed for measuring
The electronic centigrade scale of described bearing sheet displacement, described load transducer is connected with numerical value dynamometer, and described test pile is provided with pre-
Box out, inside described test pile, be provided with interior iron ball, described interior iron ball is connected with cord, described cord pass through preformed hole and be located at
Outer iron ball outside test pile connects.
2. in the opening pile for in-site measurement according to claim 1, soil fills in the model equipment of inaccessible degree, and its feature exists
In described counter-force groove is provided with rectangular opening, and described anchor pole passes through rectangular opening, and described anchor pole passes through to support lock and caging bolt solid
Fixed, described support lock is stated including four tablets, and the two ends of described tablet are provided with crotch, and one end is fixed on counter-force groove, the other end
It is hooked in anchoring pile top open part, described caging bolt is fixed on described anchoring pile, described caging bolt lower end props up counter-force groove.
3. in the opening pile for in-site measurement according to claim 1, soil fills in the model equipment of inaccessible degree, and its feature exists
In described bearing sheet is welded on described test pile.
4. in the opening pile for in-site measurement according to claim 1, soil fills in the model equipment of inaccessible degree, and its feature exists
It is solid iron ball in, described interior iron ball and outer iron ball.
5. in the opening pile for in-site measurement according to claim 1, soil fills in the model equipment of inaccessible degree, and its feature exists
In described datum line beam is bolted on described anchor pole by platform.
6. in a kind of in-site measurement opening pile, soil fills in the method for inaccessible degree it is characterised in that comprising 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 along pile body every 100mm on test pile with marking pen；
S2, stretch cord to having 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, and repeat step S2 measures thin outside test pile
Length L of ropesn；Soil plug height change H=Lsn-Ls, calculate the filling rate IFR=dL of the plug that is uneartheds/ 100 × 100 (%)；
Measure the loading force of jack during S4, jack pressurization by numerical value dynamometer, recorded by electronic centigrade scale
The displacement deflection of test pile stake top；
S5, measurement have the ultimate vertical bearing capacity of the long opening pile of same stake footpath, stake and closing pile, and are compared.
Priority Applications (1)
| 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 |
Applications Claiming Priority (1)
| 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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106400857A true CN106400857A (en) | 2017-02-15 |
| CN106400857B CN106400857B (en) | 2018-05-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611157439.0A Expired - Fee Related 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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| Country | Link |
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| CN (1) | CN106400857B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106836317A (en) * | 2017-02-24 | 2017-06-13 | 同济大学 | A kind of pile sinking model test apparatus for considering soil plug effect and its application |
| CN106884441A (en) * | 2017-04-11 | 2017-06-23 | 青岛理工大学 | The open double-walled model pile tube experimental rig of one kind visualization |
| CN110243272A (en) * | 2019-07-12 | 2019-09-17 | 福州大学 | The heavy experimental rig and measurement method for passing through soil plug and water plug height in measurement suction basis |
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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 |
| CN102587423A (en) * | 2012-03-02 | 2012-07-18 | 中国石油大学(华东) | Depth testing device for driven type soil plugs of steel pipe piles of ocean platforms |
| CN105424913A (en) * | 2015-12-29 | 2016-03-23 | 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 |
| CN205224129U (en) * | 2015-12-21 | 2016-05-11 | 武汉科技大学 | Single pile basis vertical bearing capacity's experiment detection device |
| 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 |
-
2016
- 2016-12-15 CN CN201611157439.0A patent/CN106400857B/en not_active Expired - Fee Related
Patent Citations (6)
| 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 |
| CN102587423A (en) * | 2012-03-02 | 2012-07-18 | 中国石油大学(华东) | 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 |
| CN105424913A (en) * | 2015-12-29 | 2016-03-23 | 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 |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106836317A (en) * | 2017-02-24 | 2017-06-13 | 同济大学 | A kind of pile sinking model test apparatus for considering soil plug effect and its application |
| 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 |
| CN106884441A (en) * | 2017-04-11 | 2017-06-23 | 青岛理工大学 | The open double-walled model pile tube experimental rig of one kind visualization |
| CN110243272A (en) * | 2019-07-12 | 2019-09-17 | 福州大学 | The heavy experimental rig and measurement method for passing through soil plug and water plug height in measurement suction basis |
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| Publication number | Publication date |
|---|---|
| CN106400857B (en) | 2018-05-29 |
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| 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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Granted publication date: 20180529 |