CN108252334A - A kind of asynchronous carriage and its ground in-situ testing device and test method - Google Patents
A kind of asynchronous carriage and its ground in-situ testing device and test method Download PDFInfo
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- CN108252334A CN108252334A CN201711487244.7A CN201711487244A CN108252334A CN 108252334 A CN108252334 A CN 108252334A CN 201711487244 A CN201711487244 A CN 201711487244A CN 108252334 A CN108252334 A CN 108252334A
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- box body
- steel ball
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- jack
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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
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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)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The present invention provides a kind of asynchronous carriage and its ground in-situ testing device and test method, which ensure that vertical jack does not tilt when level is further applied load, so as to which vertical load be maintained to stablize, it is ensured that the reliability of result of the test.Asynchronous carriage includes box body；The identical steel ball of one layer of diameter of tiling, steel ball cannot move horizontally in box body in box body；It is higher by the top of steel ball at the top of box side wall, steel ball top slide is placed with box cover, and box cover is not contacted with box body.When test specimen is moved horizontally under the impetus of horizontal loading in the present invention, frictional resistance is big between box bottom and test specimen, and box body and steel ball follow test specimen to be moved horizontally together；Vertical frictional resistance is big between very heavy top/bottom part and box cover, and the friction coefficient between steel ball and box cover is relatively small, and steel ball rolls in box body, and vertical jack and box cover are fixed, so as to which level jack and vertical jack can work independently.
Description
Technical field
The invention belongs to industry and civil buildings ground in-situ test field, include the pile foundation level carrying of vertical load
Power is tested and the asynchronous carriage of ground direct shear test, specially a kind of asynchronous carriage and its ground in-situ test dress
It puts and test method.
Background technology
In industry and civilian construction field, many design parameters of foundation need to obtain by live in-situ test,
To ensure that basic engineering is reasonable, economical, safe.Horizontal bearing capacity, subsoil or the friction coefficient of artificial foundation of pile foundation be
The very important design parameter of two of which.
《JGJ106-2014 architecture foundation pile inspection specifications》6th chapter is to (top no-load) under single pile free state
Horizontally loading test is made that regulation, and chapter provision explanation is pointed out：Stake top applies the horizontal translocation experiment reference under vertical load
This chapter provisions perform, but do not add explanation to the particular/special requirement of the latter's experiment.In addition ground direct shear test requirement is pushed up on block basis
Portion applies vertical load, carries out horizontal cyclic static test in block side of the base plate to ask for the parameters such as friction coefficient.Both
Experiment common ground is required carries out horizontally loading test while stake or block basis top apply vertical load.
Apply horizontal force on the basis of pile body or block again since upper load to be maintained is constant, it is necessary to assure it is horizontal and
Vertical jack is respectively worked independently, is not interfere with each other.For these reasons, it is general using under the jack for applying vertical load
It is laid with the method for one layer short round hot-rolled reinforced bar or short round hot finished steel pipe.In real work, short round hot-rolled reinforced bar or short round hot-rolled steel
Pipe easily changes distribution under the action of horizontal thrust and shifts, so as to cause vertical very heavy top rake, it is impossible to tie up
The stabilization of vertical load is held, causes result of the test inaccurate, poor reliability.And it operates in this way, in experimentation
Complexity goes wrong when adjusting with certain danger.Its rolling action cannot be played well,
Invention content
For problems of the prior art, the present invention provides a kind of asynchronous carriage and its ground in-situ test dress
It puts and test method, which ensure that vertical jack does not tilt, so as to which vertical load be maintained to stablize, it is ensured that result of the test
Reliability.Practical requirement of engineering is solved, to ensure that stake top applies the pile foundation level static test or foundation soil of vertical load
In-situ direct shear test real result is reliable, while increases the safety of experiment.
The present invention is to be achieved through the following technical solutions：
A kind of asynchronous carriage for ground in-situ test, including box body；One layer of diameter of tiling is identical in box body
Steel ball, steel ball cannot move horizontally in box body；It is higher by the top of steel ball at the top of box side wall, steel ball top slide is placed with box
Lid, box cover are not contacted with box body.
Preferably, 2~3mm at the top of box side wall is higher by the top of steel ball.
Preferably, lubricating grease is filled between steel ball in gap.
Preferably, it is fixedly installed handle respectively in the opposite two side walls of box body.
Preferably, handle is made of hot-rolled reinforced bar.
Preferably, box body is set in cuboid, is formed using hot rolled steel plate seamless welding, and steel ball is bearing ball, box cover
It is made of hot rolled steel plate.
Further, hot-rolled steel plate thickness 10mm, bearing ball diameter 38mm.
A kind of ground in-situ testing device, including the test specimen, asynchronous carriage, vertical very heavy set gradually from bottom to top
Top, vertical load measuring apparatus and vertical load；
Test specimen side is disposed with spherical hinged-support, cushion block, horizontal loading measuring apparatus and level jack, opposite side
It is disposed with horizontal displacement measuring apparatus and datum line beam；
Wherein, vertical jack is always positioned at when level jack works on asynchronous carriage；Test specimen is stake or block
Body basis.
A kind of ground home position testing method, based on above-mentioned ground in-situ testing device, vertical jack applies certain perpendicular
After load, vertical load is measured by vertical load measuring apparatus and exports vertical load data；
Level jack applies horizontal loading, pushes coupon level movement, is measured by horizontal loading measuring apparatus horizontal
Load and output level payload data；The displacement of test specimen, and output displacement data are measured by horizontal displacement measuring apparatus；
When test specimen is moved horizontally under the impetus of horizontal loading, frictional resistance between box bottom and test specimen
Greatly, box body and steel ball follow test specimen to be moved horizontally together；Vertically between very heavy top/bottom part and box cover frictional resistance it is big, steel ball with
Friction coefficient between box cover is relatively small, and steel ball rolls in box body, and vertical jack and box cover are fixed, so as to level thousand
Jin top and vertical jack can work independently.
Compared with prior art, the present invention has technique effect beneficial below：
The asynchronous carriage of the present invention, which is different from, is laid with the asynchronous sliding types such as short round hot-rolled reinforced bar, short steel pipes, is
Tile one layer of steel ball in box body, and steel ball is limited in box body, will not be as short round hot-rolled reinforced bar and short steel when steel ball rolls
Pipe shifts like that, since the steel ball in box body has gap, box cover activity, replaces or safeguards all very convenient.
Further, since box side wall is equipped with handle, transport, installation and experiment process adjusting are all very convenient.
Further, the hot-rolled steel plate thickness 10mm of deltiod box body and box cover is welded, bearing ball diameter 38mm is computed
Using the hot rolled steel plate of common material, the yield strength of steel is also not up under Ultimate Loads, therefore will not be occurred because of shape
Deform and influence the situation of asynchronous carriage normal work.
Ground in-situ testing device of the present invention, during full size field test, stake when level jack works
Or block basis can be subjected to displacement, at this moment box bottom because with the frictional force of pile cover or block surface of base is bigger will be with stake or block
Body basis moves together, steel ball be limited in box body and can in box body 360 degree roll, therefore will not be slided together with box cover
It is dynamic, it ensure that vertical jack does not tilt, so as to which vertical load be maintained to stablize, it is ensured that the reliability of result of the test.The present apparatus
Theoretically there is feasibility, also fully prove that its rolling effect is substantially better than short round steel combination in the practical application of several engineerings
(or short steel pipes combination).
The present invention is in the pile foundation level static test and the ground direct shear test of vertical load for having vertical load, asynchronous cunning
Dynamic device is placed between pile cover or block basis and vertical jack, ensures examination by the rolling of the steel ball in asynchronous carriage
The vertical force that vertical jack generates in testing does not shift because horizontal direction jack works.If vertical jack inclines
Tiltedly, then load measurement equipment placed on it will unbalance stress, vertical load is caused to measure inaccurate, influences experiment and being normally carried out
Or measurement data is caused to be distorted.
Description of the drawings
Fig. 1 is the sectional view of the asynchronous carriage of the present invention for ground in-situ test.
Fig. 2 is the vertical view of the asynchronous carriage of the present invention for ground in-situ test.
Fig. 3 is the structure diagram of ground in-situ testing device of the present invention.
In figure：1 is block basis；2 be asynchronous carriage；21 be box body；22 be steel ball；23 be box cover；24 be lubrication
Fat；25 be handle；3 be vertical jack；4 be vertical load measuring apparatus；5 be vertical load；6 be level jack；7 be water
Flat load measurement equipment；8 be cushion block；9 be spherical hinged-support；10 be horizontal displacement measuring apparatus；Beam on the basis of 11.
Specific embodiment
With reference to specific embodiment, the present invention is described in further detail, it is described be explanation of the invention and
It is not to limit.
As depicted in figs. 1 and 2, the asynchronous carriage of the present invention for ground in-situ test, including band box body 21
With box cover 23, box body 21 is to surround deltiod steel box by cassette bottom and side wall, and tile the identical steel ball 22 of one layer of diameter in box body 21,
Steel ball 22 is covered with box body 21, and making it that can only be rolled in box body 21 cannot move horizontally with respect to box body 21.Box cover 23 is plate
Structure, the diameter of steel ball 22 is bigger 2~3mm than the height of the side wall of box body 21, so as to have one between box cover 23 and the side wall of box body
Determine gap.
In this example, box body 21 and box cover 23 are made of hot rolled steel plate, the size seamless welding that box body 21 can be on demand
It forms, 23 activity of box cover, i.e., box cover 23 is not welded with box body 21.In this example, steel ball 22 uses bearing ball.Wherein, hot rolling
Steel plate thickness is 10mm, a diameter of 38mm of bearing ball.
Lubricating grease 24 is filled between steel ball 22 built in box body 21 in gap.Box body 21 is welded with respectively on opposite two side
Handle 25 made of hot-rolled reinforced bar, a diameter of 14mm of hot-rolled reinforced bar.
The process of asynchronous carriage of the present invention is as described below：
(1) prepare material；
(2) simultaneously polishing welding seams make its smooth to the box body 21 of welding deltiod；
(3) bearing ball and lubricating grease 24 are loaded；
(4) it processes handle 25 and welds；
(5) box cover 23 is installed.
As shown in figure 3, for the ground in-situ testing device of the present invention for including above-mentioned asynchronous carriage, including under
Block basis 1, asynchronous carriage 2, vertical jack 3, vertical load measuring apparatus 4 and the vertical load set gradually upwards
5；1 side of block basis is disposed with spherical hinged-support 9, cushion block 8, horizontal loading measuring apparatus 7 and level jack 6, separately
Side is disposed with horizontal displacement measuring apparatus 10 and datum line beam 11；Wherein, the area foot of asynchronous 2 horizontal direction of carriage
Enough big, to meet when level jack 6 works, vertical jack 3 is always positioned on asynchronous carriage 2.Vertical load is surveyed
Amount equipment 4 is load sensor.
Using above-mentioned ground in-situ testing device carry out ground in-situ test method, ground in-situ test be included in have it is perpendicular
To the pile foundation level bearingtest of load, ground direct shear test and contact surface Test of Friction, jack 3 vertical first is applied
After adding certain vertical load, vertical load is measured by vertical load measuring apparatus 4 and exports vertical load data；Then it is horizontal
Jack 6 applies horizontal loading, pushes coupon level movement, measures horizontal loading by horizontal loading measuring apparatus 7 and exports
Horizontal loading data；The displacement of test specimen, and output displacement data are measured by horizontal displacement measuring apparatus 10；Vertical jack 3
After applying a constant load, start to apply horizontal loading, when level jack 6 works, 21 bottom surface of box body of asynchronous carriage 2
Frictional resistance will not occur to slide relatively greatly between block basis, between 3 bottom of vertical jack and box cover 23, in box body 21
Steel ball 22 due to can be rolled in the range of 360 degree, make the friction coefficient between steel ball face and box cover face relatively small, box cover 23
It will not together be moved with steel ball 22, simultaneously because the effect of contraction of surrounding box wall, steel ball 22 and box body 21 form an entirety, with
Block basis 1 moves together, and ensures that level 6 and vertical jack 2 work independently in this way, does not interfere with each other.
The operation principle of asynchronous carriage of the present invention in test：It is poor using the friction coefficient between different contact surfaces
Different, the friction coefficient between block basis 1 and box body 21 and box cover 23 and vertical jack 3 is noticeably greater than steel ball 22 and box cover 23
Between friction coefficient, have the block foundation level bearing capacity under the conditions of vertical load, the friction system between all kinds of contact surfaces measuring
It can ensure that horizontal force and vertical force are not interfere with each other when number, foundation soil shearing strength.In the ground direct shear test for having vertical load,
Asynchronous carriage is placed between block basis 1 and vertical jack 3, passes through in the rolling guarantee test of bearing ball vertical thousand
Jin top 3 generate vertical forces not because level jack 6 work and shift, can preferably realize level jack 6 with
It works independently between vertical jack 3, so as to which guarantee test data are true and reliable, while increases the safety of experiment.
Particular embodiments described above has carried out the purpose, technical solution and advantageous effect of invention further in detail
Illustrate, it should be understood that the foregoing is merely the specific embodiment of invention, be not intended to restrict the invention, it is all to send out
Bright spirit and any modification, equivalent substitution, improvement and etc. within principle, done, should be included in protection scope of the present invention
Within.
Claims (9)
1. a kind of asynchronous carriage for ground in-situ test, which is characterized in that including box body (21)；It is put down in box body (21)
The identical steel ball (22) of one layer of diameter is spread, steel ball (22) cannot move horizontally in box body (21)；It is higher by the top of steel ball (22)
Box body (21) top side wall, steel ball (22) top slide are placed with box cover (23), and box cover (23) is not contacted with box body (21).
2. the asynchronous carriage according to claim 1 for ground in-situ test, which is characterized in that steel ball (22) pushes up
Portion is higher by box body (21) 2~3mm of top side wall.
3. the asynchronous carriage according to claim 1 for ground in-situ test, which is characterized in that steel ball (22) it
Between lubricating grease (24) is filled in gap.
4. the asynchronous carriage according to claim 1 for ground in-situ test, which is characterized in that box body (21) phase
To two side walls on be fixedly installed handle (25) respectively.
5. the asynchronous carriage according to claim 1 for ground in-situ test, which is characterized in that handle (25) is adopted
It is made of hot-rolled reinforced bar.
6. the asynchronous carriage according to claim 1 for ground in-situ test, which is characterized in that box body (21) is in
Cuboid is set, and is formed using hot rolled steel plate seamless welding, and steel ball (22) is bearing ball, and box cover is made of hot rolled steel plate.
7. the asynchronous carriage according to claim 6 for ground in-situ test, which is characterized in that hot-rolled steel plate thickness
10mm, bearing ball diameter 38mm.
8. a kind of ground in-situ testing device, which is characterized in that including test specimen, the claim 1-7 set gradually from bottom to top
The asynchronous carriage of any one of them (2), vertical jack (3), vertical load measuring apparatus (4) and vertical load (5)；
Test specimen side is disposed with spherical hinged-support (9), cushion block (8), horizontal loading measuring apparatus (7) and level jack
(6), opposite side is disposed with horizontal displacement measuring apparatus (10) and datum line beam (11)；
Wherein, vertical jack (3) is always positioned at when level jack (6) works on asynchronous carriage (2)；Test specimen is stake
Or block is basic (1).
9. a kind of ground home position testing method, which is characterized in that based on test device according to any one of claims 8, vertical jack
(3) after applying certain vertical load, vertical load is measured by vertical load measuring apparatus (4) and exports vertical load data；
Level jack (6) applies horizontal loading, pushes coupon level movement, and water is measured by horizontal loading measuring apparatus (7)
Flat load and output level payload data；The displacement of test specimen, and output displacement number are measured by horizontal displacement measuring apparatus (10)
According to；
When test specimen is moved horizontally under the impetus of horizontal loading, box body (21) frictional resistance between bottom surface and test specimen
Greatly, box body (21) and steel ball (22) follow test specimen to be moved horizontally together；Vertically between jack (3) bottom and box cover (23)
Frictional resistance is big, and the friction coefficient between steel ball and box cover is relatively small, and steel ball (22) rolls in box body (21), vertical jack
(3) and box cover (23) is fixed, so as to which level jack (6) and vertical jack (2) can work independently.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711487244.7A CN108252334A (en) | 2017-12-29 | 2017-12-29 | A kind of asynchronous carriage and its ground in-situ testing device and test method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711487244.7A CN108252334A (en) | 2017-12-29 | 2017-12-29 | A kind of asynchronous carriage and its ground in-situ testing device and test method |
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| Publication Number | Publication Date |
|---|---|
| CN108252334A true CN108252334A (en) | 2018-07-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711487244.7A Pending CN108252334A (en) | 2017-12-29 | 2017-12-29 | A kind of asynchronous carriage and its ground in-situ testing device and test method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114839357A (en) * | 2022-03-25 | 2022-08-02 | 河海大学 | Device and method for testing frost heaving stress and frost heaving strain of porous asphalt mixture |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005171732A (en) * | 2003-12-15 | 2005-06-30 | Railway Technical Res Inst | Loading test device and its method |
| CN102518210A (en) * | 2011-12-26 | 2012-06-27 | 北京工业大学 | Z-shaped-frame location-type steel ball rolling shock isolation support and manufacture method thereof |
| CN103558147A (en) * | 2013-11-08 | 2014-02-05 | 山东大学 | Vertical loading device and method under combined actions of horizontal load and vertical load |
| CN104005432A (en) * | 2014-06-17 | 2014-08-27 | 郑州大学 | Pile foundation static load testing device and method under vertical and horizontal composite loads |
| CN105334015A (en) * | 2015-10-28 | 2016-02-17 | 洛阳理工学院 | Space steel frame node loading test device and application thereof |
| CN207812517U (en) * | 2017-12-29 | 2018-09-04 | 中国电力工程顾问集团西北电力设计院有限公司 | A kind of asynchronous carriage and its ground in-situ testing device |
-
2017
- 2017-12-29 CN CN201711487244.7A patent/CN108252334A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005171732A (en) * | 2003-12-15 | 2005-06-30 | Railway Technical Res Inst | Loading test device and its method |
| CN102518210A (en) * | 2011-12-26 | 2012-06-27 | 北京工业大学 | Z-shaped-frame location-type steel ball rolling shock isolation support and manufacture method thereof |
| CN103558147A (en) * | 2013-11-08 | 2014-02-05 | 山东大学 | Vertical loading device and method under combined actions of horizontal load and vertical load |
| CN104005432A (en) * | 2014-06-17 | 2014-08-27 | 郑州大学 | Pile foundation static load testing device and method under vertical and horizontal composite loads |
| CN105334015A (en) * | 2015-10-28 | 2016-02-17 | 洛阳理工学院 | Space steel frame node loading test device and application thereof |
| CN207812517U (en) * | 2017-12-29 | 2018-09-04 | 中国电力工程顾问集团西北电力设计院有限公司 | A kind of asynchronous carriage and its ground in-situ testing device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114839357A (en) * | 2022-03-25 | 2022-08-02 | 河海大学 | Device and method for testing frost heaving stress and frost heaving strain of porous asphalt mixture |
| CN114839357B (en) * | 2022-03-25 | 2023-05-16 | 河海大学 | Device and method for testing frost heaving stress and frost heaving strain of porous asphalt mixture |
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