CN109826246A - One kind intending bidirectional circulating load loading device and test method for Model Pile - Google Patents
One kind intending bidirectional circulating load loading device and test method for Model Pile Download PDFInfo
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- CN109826246A CN109826246A CN201910014727.8A CN201910014727A CN109826246A CN 109826246 A CN109826246 A CN 109826246A CN 201910014727 A CN201910014727 A CN 201910014727A CN 109826246 A CN109826246 A CN 109826246A
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- wirerope
- stake
- loading device
- pile
- mass block
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Abstract
The invention discloses one kind to intend bidirectional circulating load loading device and test method for Model Pile.It includes the simulation box, the first wirerope and the second wirerope for fixed-analog stake of banketing that this, which intends bidirectional circulating load loading device for Model Pile,；The both ends of second wirerope are connected to the both ends that on the first wirerope and junction of two wirerope is located at the simulation stake by steel wire clamp, one end of first wirerope is connected and fixed support by weight beam, and the other end of first wirerope connects the pallet for placing mass block around fixed pulley.The device forms horizontal whirl-sprayed pile by increasing mass block in pallet and reducing mass block original in pallet by the elasticity of weight beam；By increasing mass block in control pallet and reducing the speed of mass block come the frequency of control loop.It is influenced to study stake under horizontal whirl-sprayed pile by loading frequency, cycle-index, cycle period with this loading method, analyzes the bearer properties of stake.
Description
Technical field:
The present invention relates to one kind to intend bidirectional circulating load loading device and test method for Model Pile, belongs to field of civil engineering
Pile foundation engineering research field.
Background technique:
With the exploitation of China's marine resources and the continuous construction of ocean engineering, the application of pile foundation has obtained development in an all-round way,
Concern of the load-carrying properties of stake by a large amount of scholars under horizontal whirl-sprayed pile effect.Pile foundation will be not only able to bear by top
Xial feed caused by structure and pile body self weight etc., and be required to bear by wave load, wind load, vehicle braking force lotus
Horizontal loading caused by load etc..Under afloat particular surroundings, if the Long-term Cyclic Loading of stormy waves acts on, to the load-carrying properties of stake
There are influences.Pile peripheral earth accumulated deformation and plastic strain can be caused to increase under cyclic load so that the level that stake generates
It is displaced excessive, pile peripheral earth, which is disturbed, leads to body Stiffness, and bearing capacity of pile foundation reduces.
The bearer properties of research stake usually use model test, can preferably reflect that the carrying of stake is special by model test
Property.Due to being limited by lateral loading facilities condition and the complexity of problem itself, recycled both at home and abroad to by horizontal bidirectional
The scene of load stake and indoor experimental study are less.The level of short-term static load is rested on to the research overwhelming majority of stake at present
On, many problems not yet solve, and many problems are to be resolved.At present for by horizontal whirl-sprayed pile effect under loading device compared with
It is few, and loading device is more complicated, and operate control, is easy to be influenced by extraneous factor.
Summary of the invention
The object of the present invention is to provide one kind to intend bidirectional circulating load loading device and test method for Model Pile, i.e., logical
The elasticity for crossing weight beam forms horizontal cyclic by increasing mass block in pallet and reducing mass block original in pallet
Load；By increasing mass block in control pallet and reducing the speed of mass block come the frequency of control loop.With this loading method
It is influenced to study stake under horizontal whirl-sprayed pile by loading frequency, cycle-index, cycle period, analyzes the bearer properties of stake.
Above-mentioned purpose is achieved through the following technical solutions:
Intend bidirectional circulating load loading device for Model Pile, including simulation box, the first steel wire for fixed-analog stake of banketing
Rope and the second wirerope；The both ends of second wirerope are connected on first wirerope simultaneously by steel wire clamp
And the junction of two wirerope is located at the both ends of the simulation stake, one end of first wirerope is connected by weight beam
Hold-down support is connect, the other end of first wirerope connects the pallet for placing mass block around fixed pulley.
Described intends bidirectional circulating load loading device for Model Pile, described to add for the quasi- bidirectional circulating load of Model Pile
The laser shooting system set further include for shooting simulation stake displacement is carried, the laser shooting system includes laser light source, CCD
Camera and camera support for fixing CCD camera.
Described intends bidirectional circulating load loading device, first wirerope and second wirerope for Model Pile
Diameter it is equal.
Described intends bidirectional circulating load loading device for Model Pile, and the first wirerope, the parameter of the second wirerope are full
Sufficient the following conditions:
L 1 +L 2 +L 3 +a≤L 1 +L 2 +L 3 +a +h-L 4 ,
In formulaL 1 The distance between simulation box is arrived for hold-down support；
L 2 The distance between simulation box is arrived for fixed pulley；
L 3 For the upper surface banketed in simulation box and the distance between the first wirerope or the second wirerope；
L 4 By test institute permission weight beam spring extend maximum length；
aFor the width of simulation box；
hFor the height of simulation box.
Described intends bidirectional circulating load loading device for Model Pile, and the bore of the simulation box is that the simulation stake is straight
5 times or more of diameter.
Intend the method that bidirectional circulating load loading device is tested, this method for Model Pile with above-mentioned are as follows: apply water
When flat cyclic load, weight beam is first stretched to the maximum value more than or equal to amplitude, then by simulation stake by filling out
Soil is fixed in simulation box, then is increased mass block original in mass block and reduction pallet in pallet and formed horizontal cyclic lotus
It carries；By increasing mass block in control pallet and reducing the speed of mass block come the frequency of control loop.
The method further includes increasing mass block in control pallet to carry out control loop with the speed for reducing mass block
Laser is opened during frequency, and CCD camera is fixed on camera support, is obtained by adjusting camera position and focal length
The picture of shooting simulation stake is carried out after suitable visual field, a cycle shoots four, after every grade of load is stablized, then shoots the grade
Model image under load；The image that load front and back is shot is handled by PIV software, load front and back pile peripheral earth can be obtained
Displacement field.
The utility model has the advantages that
1. the present invention generates scheduled pulling force by weight beam in heavy object box pre-add mass block, using this state as initial shape
State；Then add mass block with mass block is subtracted in heavy object box to realize that horizontal cyclic loads.
2. compared with the mode of other shock insulation vibration dampings, the present invention has loading device structure simple, is easy to control, can be with
It is convenient that low-frequency quasi- bidirectional circulating load is applied to Model Pile.
Detailed description of the invention
Fig. 1 is the device of the invention structural schematic diagram.
Fig. 2 is the power loop control loading device schematic diagram of apparatus of the present invention.
Specific embodiment
With reference to embodiment, the present invention is furture elucidated, it should be understood that following specific embodiments are only used for
It is bright the present invention rather than limit the scope of the invention.
As shown in Figure 1, one kind of the present embodiment intends bidirectional circulating load loading device for Model Pile, including for banketing
The simulation box 5 of fixed-analog stake 12, the first wirerope 3 and the second wirerope 4；The both ends of second wirerope pass through steel wire
Rope clamp is connected to the both ends that on the first wirerope and junction of two wirerope is located at the simulation stake, described
One end of first wirerope is connected and fixed support 1 by the meter of spring dynamometry 2, and the other end of first wirerope bypasses fixed pulley
6 connect the pallet 8 for placing mass block 7.
Described intends bidirectional circulating load loading device for Model Pile, described to add for the quasi- bidirectional circulating load of Model Pile
Carry set further include for shoot simulation stake displacement laser shooting system, the laser shooting system include laser light source 9,
CCD camera 10 and camera support 11 for fixing CCD camera.
Described intends bidirectional circulating load loading device, first wirerope and second wirerope for Model Pile
Diameter it is equal.
Described intends bidirectional circulating load loading device for Model Pile, and the first wirerope, the parameter of the second wirerope are full
Sufficient the following conditions:
L 1 +L 2 +L 3 +a≤L 1 +L 2 +L 3 +a +h-L 4 ,
In formulaL 1 The distance between simulation box is arrived for hold-down support；
L 2 The distance between simulation box is arrived for fixed pulley；
L 3 For the upper surface banketed in simulation box and the distance between the first wirerope or the second wirerope；
L 4 By test institute permission weight beam spring extend maximum length；
aFor the width of simulation box；
hFor the height of simulation box.
Described intends bidirectional circulating load loading device for Model Pile, and the bore of the simulation box is that the simulation stake is straight
5 times or more of diameter.
Intend the method that bidirectional circulating load loading device is tested, this method for Model Pile with above-mentioned are as follows: apply water
When flat cyclic load, weight beam is first stretched to the maximum value more than or equal to amplitude, then by simulation stake by filling out
Soil is fixed in simulation box, then is increased mass block original in mass block and reduction pallet in pallet and formed horizontal cyclic lotus
It carries；By increasing mass block in control pallet and reducing the speed of mass block come the frequency of control loop.
The specific operation method is as follows:
1) size of Model Pile, the size of model casing, the range of weight beam, wirerope are determined according to the model test of design
Length, mass block gravity；
2) soil in model casing is determined according to testing program；
3) it according to the property of testing program control soil, then bankets in model casing, reaches the position of setting model stake lower end；
4) Model Pile is placed on the soil being embedded to, then proceedes to banket in model casing；
5) weight beam is fixed on hold-down support, with wirerope connecting spring dynamometer and pallet；
6) calculating needs peak load to be loaded, and corresponding mass block is then added in pallet according to calculated result；
7) then multistage loadings and unloading, makes stake generate cyclic load in the horizontal direction.
Embodiment 1
In order to study FRPC built pile in the macro microcosmic mechanism of stake soil of horizontal cyclic female die stake, using of the invention a kind of for mould
Bidirectional circulating load loading device is intended in type stake, realizes horizontal quasi- CYCLIC LOADING；
Realize FRPC combination half module stake horizontal cyclic the following steps are included:
1) determine that a length of 1.6m of stake of Model Pile, stake diameter are 0.07m, the size of model casing according to the model test of design are as follows:
1.6m × 0.4m × 1.2m, the range 2.4kN of weight beam, the gravity 0.1kg that the length of wirerope is 2.6m, mass block；
(as shown in the figure)；
2) determine to be sand in model casing according to testing program；
3) compactness of sand is controlled according to testing program placement in layers sand, then each 0.02m is pressed after filling in model casing
It is real, reach the height of 0.4m；
4) Model Pile is placed on the soil bought in, then proceedes to placement in layers, every layer of height is 0.02m；
5) weight beam is fixed on hold-down support, with wirerope connecting spring dynamometer and pallet；
6) it is 2kN that calculating, which needs peak load to be loaded, and 10 mass blocks are then added in pallet；
7) test is chosen and carries out that camera being fixed on bracket to provide stable luminous environment at night, during entire test
Each device relative position is kept to fix；
8) laser is opened, and CCD camera is fixed on camera support, is suitble to by adjusting camera position and focal length acquisition
Visual field；
9) a cycle shoots four, after every grade of load is stablized, then shoots the model image under this grade of load；
10) image shot by PIV software processing load front and back, can be obtained the displacement field of load front and back pile peripheral earth.
Claims (7)
1. one kind intends bidirectional circulating load loading device for Model Pile, it is characterised in that: including for fixed-analog stake of banketing
Simulation box, the first wirerope and the second wirerope；The both ends of second wirerope are connected to institute by steel wire clamp
On the first wirerope stated and junction of two wirerope be located at it is described simulation stake both ends, the one of first wirerope
End is connected and fixed support by weight beam, and the other end of first wirerope connects around fixed pulley for placing quality
The pallet of block.
2. according to claim 1 intend bidirectional circulating load loading device for Model Pile, it is characterised in that: described to be used for
It further includes the laser shooting system for shooting simulation stake displacement that Model Pile, which intends bidirectional circulating load loading device, and the laser is clapped
The system of taking the photograph includes laser light source, CCD camera and the camera support for fixing CCD camera.
3. according to claim 1 intend bidirectional circulating load loading device for Model Pile, it is characterised in that: described first
Wirerope is equal with the diameter of second wirerope.
4. according to claim 1 intend bidirectional circulating load loading device for Model Pile, it is characterised in that: the first steel wire
It restricts, the parameter of the second wirerope meets the following conditions:
L 1 +L 2 +L 3 +a≤L 1 +L 2 +L 3 +a +h-L 4 ,
In formulaL 1 The distance between simulation box is arrived for hold-down support；
L 2 The distance between simulation box is arrived for fixed pulley；
L 3 For the upper surface banketed in simulation box and the distance between the first wirerope or the second wirerope；
L 4 By test institute permission weight beam spring extend maximum length；
aFor the width of simulation box；
hFor the height of simulation box.
5. according to claim 1 intend bidirectional circulating load loading device for Model Pile, it is characterised in that: the simulation
The bore of case is 5 times or more of the simulation stake diameter.
6. a kind of intend the method that bidirectional circulating load loading device is tested for Model Pile with above-mentioned, it is characterised in that: should
Method are as follows: when applying horizontal whirl-sprayed pile, weight beam is first stretched to the maximum value more than or equal to amplitude, then will
Simulation stake is fixed in simulation box by banketing, then is increased mass block original in mass block and reduction pallet in pallet and formed
Horizontal whirl-sprayed pile；By increasing mass block in control pallet and reducing the speed of mass block come the frequency of control loop.
7. according to the method described in claim 6, it is characterized by also including increase mass block in control pallet and reduce matter
The speed of gauge block is opened laser during the frequency of control loop, and CCD camera is fixed on camera support, passes through
Adjustment camera position and focal length carry out the picture that stake is simulated in shooting after obtaining suitable visual field, and a cycle shoots four, to every
After grade load is stablized, then shoot the model image under this grade of load；The image that load front and back is shot is handled by PIV software, i.e.,
It can obtain the displacement field of load front and back pile peripheral earth.
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| Application Number | Priority Date | Filing Date | Title |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910014727.8A CN109826246A (en) | 2019-01-08 | 2019-01-08 | One kind intending bidirectional circulating load loading device and test method for Model Pile |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110344452A (en) * | 2019-07-16 | 2019-10-18 | 广东工业大学 | A kind of bending measuring device and its measurement method |
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| CN102518152A (en) * | 2011-11-18 | 2012-06-27 | 同济大学 | Test device simulating bridge pile foundation under bidirectional cyclic load effect |
| CN103398910A (en) * | 2013-07-06 | 2013-11-20 | 浙江大学 | Novel model testing platform for interaction of offshore wind turbine upper structure-foundation-soil power |
| CN104155190A (en) * | 2014-08-08 | 2014-11-19 | 同济大学 | Test system for simulation of long-term cyclic loading effect |
| CN107829451A (en) * | 2017-11-11 | 2018-03-23 | 广州环保投资集团有限公司 | Horizontal bidirectional cyclic load loading device and test method based on model casing |
| CN108396790A (en) * | 2018-04-02 | 2018-08-14 | 青岛理工大学 | A kind of two-way dynamic loading test device and method of foundation |
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2019
- 2019-01-08 CN CN201910014727.8A patent/CN109826246A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102518152A (en) * | 2011-11-18 | 2012-06-27 | 同济大学 | Test device simulating bridge pile foundation under bidirectional cyclic load effect |
| CN103398910A (en) * | 2013-07-06 | 2013-11-20 | 浙江大学 | Novel model testing platform for interaction of offshore wind turbine upper structure-foundation-soil power |
| CN104155190A (en) * | 2014-08-08 | 2014-11-19 | 同济大学 | Test system for simulation of long-term cyclic loading effect |
| CN107829451A (en) * | 2017-11-11 | 2018-03-23 | 广州环保投资集团有限公司 | Horizontal bidirectional cyclic load loading device and test method based on model casing |
| CN108396790A (en) * | 2018-04-02 | 2018-08-14 | 青岛理工大学 | A kind of two-way dynamic loading test device and method of foundation |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110344452A (en) * | 2019-07-16 | 2019-10-18 | 广东工业大学 | A kind of bending measuring device and its measurement method |
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Application publication date: 20190531 |