CN108411951B - A kind of stake top compliant rotational constrained test device and method - Google Patents
A kind of stake top compliant rotational constrained test device and method Download PDFInfo
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- CN108411951B CN108411951B CN201810118471.0A CN201810118471A CN108411951B CN 108411951 B CN108411951 B CN 108411951B CN 201810118471 A CN201810118471 A CN 201810118471A CN 108411951 B CN108411951 B CN 108411951B
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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 provides a kind of stake top compliant rotational constrained test device and method, belongs to the technical field of pile foundation engineering, which includes guide rail bracket assembly, horizontal addload module and stake top rotational restraint module；Stake top rotational restraint module is arranged between two crossbeams, including the curb girder being slidably connected with crossbeam and using the center line of Model Pile as symmetrically arranged two transmission rods of symmetry axis, two groups of teeth wheel group and two groups of torsion spring groups；Horizontal addload module includes electrohydraulic servo system, the separator box for being set in model stake top and the bottom plate being arranged between two crossbeams.The device can simulate the constraint of stake top compliant rotational, and the horizontal bearing characteristic for stake under the conditions of research stake top flexible constraint provides experimental test means.
Description
Technical field
The present invention relates to the technical field of pile foundation engineering, more particularly to a kind of stake top compliant rotational constrained test device and
Method.
Background technique
Stake top constraint condition is generally provided by pile foundation superstructure or cushion cap, and being commonly divided into sliding constraint, (stake top cannot
Rotate but can move horizontally) and completely free two class situations.It is insufficient for marine jacket steel pipe pile foundation or pile crown anchoring
Prefabricated tubular pile, ideal stake top build-in situation will be weaker than by the constraint of superstructure or cushion cap, in the horizontal lotus such as wave, macroseism
It easily leads to pile crown under load effect to rotate together with structure or rotate in cushion cap, stake top is connected as flexible constraint company at this time
It connects.When stake top and cushion cap are anchored secured, stake top also tends to rotate with cushion cap, does not limit rotation because stake top is fixed.On
It states in situation, stake top is connected as the connection of the flexible constraint between build-in and freedom, and rotational stiffness will significantly affect stake
Horizontal force characteristic, and it is generally existing in practical projects.Horizontal displacement under identical horizontal loads, when stake top is free
Four times when about stake top sliding constrains, and in the case of identical horizontal displacement, required external load is not as good as stake top when stake top is free
Slide the half of constraint.If still carried out Design of Foundation by completely clamped situation, relatively practical displacement result less than normal will be obtained, if
Meter will be partially dangerous.Therefore, for the Design of Foundation in said circumstances, it is necessary to take into account stake top physical constraint condition is taken
Reasonable inverted constraint rigidity is beneficial to improve designed reliability and safety of structure.
Chinese invention patent " CN201210497143.9 " discloses a kind of stake top sliding restraint device and method, including position
Reaction frame and track frame assembly around pile foundation, the interior setting cuff of track frame assembly is in the separate type fixed case of stake top.Due to
Separator box can only be along guide rail horizontal movement, and when stake top is by horizontal force, stake top only generates horizontal displacement, without generating rotation, from
And it realizes stake top and slides constraint condition.Chinese invention patent " CN201410751620.9 " discloses a kind of simulation pile foundation flexing resistance
Energy experimental rig applies a pair of of couple, the load of implementation model stake Based on Pure Bending Moment to stake top by transmission rod in loading system.In a word
Come, has the model test apparatus of stake, substantially freely or sliding restraint condition for stake top, and stake top compliant rotational constraint condition
The horizontal bearing characteristic research of lower stake is also limited to theory analysis, there is no analog loading device related to this.And in practical work
Cheng Zhong, the working performance of stake suffer from the influence of stake top flexible constraint, it is therefore necessary to design a kind of for stake in this case
Horizontal addload experimental rig.
Summary of the invention
The purpose of the present invention is to provide a kind of stake top compliant rotational constrained test devices, to simulate stake top compliant rotational about
Beam, the horizontal bearing characteristic for stake under the conditions of research stake top flexible constraint provide experimental test means, and based on the device,
A kind of stake top compliant rotational constrained test method is provided, obtains the functional relation of stake top restraining moment Yu stake top corner.
The present invention provides a kind of stake top compliant rotational constrained test device, including guide rail bracket assembly, horizontal addload module and
Stake top rotational restraint module；Guide rail bracket assembly includes using the center line of Model Pile as symmetrically arranged two crossbeams of symmetry axis；Stake
It pushes up rotational restraint module to be arranged between two crossbeams, including the curb girder being slidably connected with crossbeam and with the center line of Model Pile
For symmetrically arranged two transmission rods of symmetry axis, two groups of teeth wheel group and two groups of torsion spring groups；Horizontal addload module includes electro-hydraulic
Servo-system, the separator box for being set in model stake top and the bottom plate being arranged between two crossbeams；Gear set includes setting
The first horizontal axis and the second horizontal axis between two curb girders and be respectively sleeved on the first horizontal axis and the second horizontal axis and it is mutual
The first gear and second gear of engagement；Second gear is located at except first gear and diameter is less than the diameter of first gear；It turns round
Square groups of springs includes the two sections of torsion springs for being set on the second horizontal axis and being located at second gear two sides；The first end of torsion spring
It is fixed in second gear, second end is fixed on the second horizontal axis or curb girder；In transmission rod and first gear and second gear
The heart is concordant, and first end is fixed on separator box, and second end is connect with first gear；There are two load bars for setting on separator box；Two
A load bar is located at Model Pile two sides, and end is plugged in the groove of curb girder, and the line and two biographies of two load bars
The line of power bar is vertical；Electrohydraulic servo system includes the hydraulic loaded machine for being fixed on bottom plate and being symmetrically distributed in transmission rod two sides
Structure；The telescopic end of hydraulic loading mechanism is hinged with load bar.
Further, the second end of transmission rod is provided with for first gear to be fastened on to interior snap-gauge；On snap-gauge laterally
It is provided with the strip through-hole that both ends are arc end；The cylinder that the two sides of first gear are arranged for being plugged in strip through-hole connects
Head.
Further, the groove of curb girder is the strip groove that both ends are arc end, and vertically arranged；The end of load bar is
It is cylindric.
Further, stake top rotational restraint module further includes spring clamp mechanism；Spring clamp mechanism includes fixed block, rotation
The threaded rod stretched out from fixed block and the switch block being set on threaded rod；It is provided with annular groove on fixed block and spill spin block and cuts
Face is semicircular connectivity slot；Annular groove is arranged along threaded rod；The first end of connectivity slot is connected to annular groove, second end setting
At fixed block or the edge of spill spin block.
Further, electrohydraulic servo system further include data for acquiring hydraulic loading mechanism and by data feedback to outer
Meet the Electric signal processing mechanism of processor.
Further, first gear is set on the first horizontal axis by first bearing；Second gear passes through second bearing set
It is located on the second horizontal axis；The inner ring of first bearing and the first horizontal axis are interference fitted, and outer ring and first gear are interference fitted；Second axis
The inner ring held and the second horizontal axis are interference fitted, and outer ring and second gear are interference fitted.
Further, guide rail bracket assembly further includes the half circular track being arranged on the top and bottom of crossbeam；On curb girder
It is provided with the driving wheel being slidably matched with half circular track.
Further, stake top compliant rotational constrained test device further includes reaction frame；Reaction frame includes support column and Z-shaped branch
Support；The quantity of support column is four, and the bottom surface of top and crossbeam connects, and bottom end is fixed on the support surface；The quantity of Z-shaped support is
Two, it is arranged in and connect respectively with two crossbeams and between two adjacent support columns；It is Z-shaped support include twice cross-brace with
And one of diagonal brace between twice cross-brace is set.
Further, guide rail bracket assembly, stake top rotational restraint module and reaction frame are made of Steel material.
The present invention also provides a kind of stake top compliant rotational constrained test method, this method is based on above-mentioned stake top compliant rotational about
Beam experimental rig is implemented, and includes the following steps:
Start hydraulic loading mechanism, horizontal loading applied to the stake top of Model Pile,
According to the mechanics of materials, every section of torsion spring torqueTAnd torsion angleαBetween relationship are as follows:
(1)
In formula,EFor the elasticity modulus of torsion spring, unit GPa；dFor the diameter of torsion spring material, unit m；D 0
For the initial diameter of torsion spring, unit m；N 0For the effective turn of torsion spring,αFor the corner of torsion spring, unit is
Degree；
The total torque of four sections of torsion springsT 1It is as follows:
(2)
According to gear set radius and transmission rod length relation, stake top inverted constraint moment of flexure can be obtainedMAre as follows:
(3)
In formula,rFor the radius of second gear, unit m；LFor the length of transmission rod, unit m；
In view of stake top corner is small, the displacement of transmission rod second end is approximately equal to the displacement of the lines of gear set, stake top turns
AngleθAre as follows:
() (4)
In formula, △hFor the displacement of transmission rod second end；
Joint type (1) ~ (4), can obtainM and θRelational expression:
() (5)
In formula,kFor stake top rotational restraint.
Compared with prior art, present invention has an advantage that
1, stake top is applied by stake top rotational restraint module in stake top compliant rotational constrained test device provided by the invention
Add inverted constraint moment of flexure, realize the simulation of stake top compliant rotational constraint, for the level of stake under the conditions of research stake top flexible constraint
Bearer properties provide experimental test means, and specifically hydraulic loading mechanism applies horizontal loading to the stake top of Model Pile, in water
Stake top rotates under flat load action, and transmission rod will generate identical with stake top corner, and the rotation of mate gear group is by stake
Rotational response is pushed up to torsion spring, stake top corner is converted to torsion spring torsion angle, and the test method provided according to the present invention can
The relationship between torsion spring torsion angle and stake top corner and torsion spring torque and stake top inverted constraint moment of flexure is established, and most
The functional relation of stake top inverted constraint moment of flexure Yu stake top corner is obtained eventually；
2. by adjusting torsion spring parameter and power transmission pole length, settable difference stake top rotational restraint is improved
The flexibility and applicability of test；
3. being amplified the small corner displacement of stake top by transmission rod, first gear and second gear, and reflects and arrive torque
On the torsion angle of spring, the loading accuracy of inverted constraint moment of flexure is improved；
If 4, the curb girder in stake top rotational restraint module is fixedly connected with crossbeam, when stake top corner is larger, two power transmissions
One, bar tension one is pressurized, and will affect the rotation of gear, and the curb girder and crossbeam in the present invention in stake top rotational restraint module are sliding
Dynamic connection, stake top and the displacement of stake top rotational restraint module level are identical, then do not interfere with the rotation of gear, make the rotation of stake top
It is substantially completely reacted in gear rotation, improves the amplification effect of the rotation of gear mesh stake top.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing, in which:
Fig. 1 is the structural schematic diagram for the stake top compliant rotational constrained test device that the embodiment of the present invention 1 provides；
Fig. 2 is the sectional view of the constrained test device of stake top compliant rotational shown in Fig. 1；
Fig. 3 is the semisymmetric graph of the constrained test device of stake top compliant rotational shown in Fig. 1；
Fig. 4 is the structural schematic diagram of stake top rotational restraint module in the constrained test device of stake top compliant rotational shown in Fig. 1；
Fig. 5 is the structural schematic diagram of horizontal addload module in the constrained test device of stake top compliant rotational shown in Fig. 1；
Fig. 6 is the structural schematic diagram of curb girder and driving wheel in the module of stake top rotational restraint shown in Fig. 4；
Fig. 7 is scheme of installation of the spring clamp mechanism in second gear in the module of stake top rotational restraint shown in Fig. 4；
Fig. 8 is the structural schematic diagram of spring clamp mechanism in the module of stake top rotational restraint shown in Fig. 4；
Fig. 9 is the structural schematic diagram of separator box in horizontal addload module shown in Fig. 5.
Label: 101- crossbeam；102- half circular track；201- curb girder；202- transmission rod；The first horizontal axis of 203-；204-
Two horizontal axis；205- first gear；206- second gear；207- torsion spring；208- snap-gauge；209- fixed block；210- threaded rod；
211- spill spin block；212- driving wheel；301- separator box；302- bottom plate；303- load bar；304- hydraulic loading mechanism；401- branch
Dagger；The support of 402-Z shape；501- model casing；502- model clay；600- Model Pile.
Specific embodiment
Embodiment 1
The present embodiment provides a kind of stake top compliant rotational constrained test devices, and as shown in Figures 1 to 6, including guide rail bracket is total
At, horizontal addload module and stake top rotational restraint module；Guide rail bracket assembly includes using the center line of Model Pile 600 as symmetry axis pair
Claim two crossbeams 101 of setting；Stake top rotational restraint module is arranged between two crossbeams 101, including slides and connect with crossbeam 101
The curb girder 201 that connects and using the center line of Model Pile 600 as symmetrically arranged two transmission rods 202 of symmetry axis, two groups of teeth wheel group
With two groups of torsion spring groups；Horizontal addload module includes electrohydraulic servo system, the separator box 301 for being set in 600 stake top of Model Pile
And the bottom plate 302 between two crossbeams 101 is set；Gear set includes the first horizontal axis being arranged between two curb girders 201
203 and second horizontal axis 204 and be respectively sleeved on the first horizontal axis 203 and the second horizontal axis 204 and intermeshing first tooth
Wheel 205 and second gear 206；Second gear 206 is located at except first gear 205 and diameter is less than the diameter of first gear 205；
Torsion spring group includes the two sections of torsion springs 207 for being set on the second horizontal axis 204 and being located at 206 two sides of second gear；Torque
The first end of spring 207 is fixed in second gear 206, and second end is fixed on the second horizontal axis 204 or curb girder 201, so that the
Energy band dynamic torque spring 207 reverses when two gears 206 rotate；In transmission rod 202 and first gear 205 and second gear 206
The heart is concordant, and first end is fixed on separator box 301, and second end is connect with first gear 205；On separator box 301 there are two settings
Load bar 303；Two load bars 303 are located at 600 two sides of Model Pile, and end is plugged in the groove of curb girder 201, and two
The line of load bar 303 is vertical with the line of two transmission rods 202；Electrohydraulic servo system is on bottom plate 302 and right including being fixed on
Claim the hydraulic loading mechanism 304 for being distributed in 202 two sides of transmission rod；The telescopic end and load bar 303 of hydraulic loading mechanism 304 are hinged
It connects, when so that stake top rotating, hydraulic loading mechanism 304 and 303 junction of load bar are free to rotate, remain load
Direction is horizontal.
Further, the connection type of the second end with first gear 205 of transmission rod 202 can be such as shaft and turn hole and match
The flexible connection of conjunction.
Further, as shown in figure 4, the second end of transmission rod 202 be provided with for by first gear 205 be fastened in
Snap-gauge 208；Laterally (in the same direction with crossbeam 101) is provided with the strip through-hole that both ends are arc end on snap-gauge 208；First gear 205
Two sides column joint for being plugged in strip through-hole is set.When gear set rotates, column joint can be in strip through-hole
Sliding reduces the limitation that the pulling force generated when transmission rod 202 rotates rotates first gear 205, but since column joint is in item
Sliding, is effectively equivalent to the minute elongation of transmission rod 202 in shape through-hole.Items displacement is all smaller when due to device work,
So transmission rod 202 is still by former long calculating.
Further, as shown in figs. 5 and 9, the groove of curb girder 201 is the strip groove that both ends are arc end, and vertical
(axial in the same direction with Model Pile 600) setting；The end of load bar 303 is cylindric.The resolution of displacement of load bar 303 is horizontal position
It moves and vertical displacement, vertical displacement is presented as that load bar 303 slides in strip groove, load bar 303 drives in horizontal direction
Stake top and stake top rotational restraint module synchronization are mobile, to guarantee that stake top and the displacement of stake top rotational restraint module level are identical, reduce
Limitation to gear set rotation.
Further, as shown in Figure 7 and Figure 8, stake top rotational restraint module further includes spring clamp mechanism；Spring clamp machine
Structure includes fixed block 209, the threaded rod stretched out from fixed block 209 210 and the spill spin block 211 being set on threaded rod 210；Gu
Determine to be provided with annular groove on block 209 and spill spin block 211 and section is semicircular connectivity slot；Annular groove is set along threaded rod 210
It sets；The first end of connectivity slot is connected to annular groove, and the edge of fixed block 209 or spill spin block 211 is arranged in second end.Fixed block
209 for being fixed at second gear 206, the second horizontal axis 204 or curb girder 201, and the end of torsion spring 207 is from connectivity slot
After protruding into annular groove, tightens the nut on spill spin block 211 and make spill spin block 211 and fixed block 209 by the end of torsion spring 207
It clamps.
Further arrive, as shown in figure 9, the inner peripheral surface of separator box 301 and the circumferential surface of Model Pile 600 agree with, it can by two
The separation box body of pairing and the Screw arbor with nut at both-ends for locking separator box cabinet are constituted, and are tightened the nut of Screw arbor with nut at both-ends, are made two points
From the fastening that box body pairing realizes separator box 301 and 600 stake top of Model Pile.
Further, electrohydraulic servo system further includes data for acquiring hydraulic loading mechanism 304 and by data feedback
To the Electric signal processing mechanism of external processor.In the present embodiment, hydraulic loading mechanism 304 mainly includes HS01 210L pull rod
Type hydraulic cylinder and the device to match with it.
Further, first gear 205 is set on the first horizontal axis 203 by first bearing；Second gear 206 passes through the
Two bearings are set on the second horizontal axis 204；The inner ring of first bearing and the first horizontal axis 203 are interference fitted, outer ring and first gear
205 interference fits；The inner ring of second bearing and the second horizontal axis 204 are interference fitted, and outer ring and second gear 206 are interference fitted.It is logical
Cross bearing connection gear and frictional resistance when horizontal axis can reduce gear rotation.After bearing heating expansion, inner ring is covered in time
Onto corresponding horizontal axis, after bearing cooling, gear is heated in rear enclosure to bearing outer ring, it can limiting gear edge cross after cooling deflation
Axis is mobile, realizes interference fit.
The mode being slidably connected between curb girder 201 and crossbeam 101 can be the modes such as the cooperation of sliding slot and sliding block, in this reality
It applies in example, specifically, as shown in fig. 6, guide rail bracket assembly further includes that the semicircle being arranged on the top and bottom of crossbeam 101 is led
Rail 102；The driving wheel 212 being slidably matched with half circular track 102 is provided on curb girder 201, to reduce friction resistance when sliding
Power.
Further, as depicted in figs. 1 and 2, stake top compliant rotational constrained test device further includes reaction frame；Reaction frame packet
It includes and is used to support guide rail bracket assembly, the support column 401 of horizontal addload module and stake top rotational restraint module and for enhancing support
The Z-shaped support 402 of 401 stability of column；The quantity of support column 401 is four, and top is connect with the bottom surface of crossbeam 101, and bottom end is solid
Determine on the support surface；The quantity of Z-shaped support 402 is two, is arranged in and connect respectively with two crossbeams 101 and two adjacent branch
Between dagger 401；Z-shaped support 402 includes twice cross-brace and one of diagonal brace being arranged between twice cross-brace.
Further, guide rail bracket assembly, stake top rotational restraint module and reaction frame are made of Steel material.Crossbeam 101 is
I-steel is connect by bolt with support column 401；Half circular track 102 is welded on the edge of a wing of I-steel；First horizontal axis 203
It is welded with curb girder 201 with the second horizontal axis 204；Bottom plate 302 is connect by bolt with the bottom surface of crossbeam 101.
Further, as shown in figure 3, stake top compliant rotational constrained test device further includes the model for fixed model stake
Case 501, model casing 501 are made of Steel material, and model clay 502 has been filled in case.
Embodiment 2
The present embodiment provides a kind of stake top compliant rotational constrained test method, it is soft that this method is based on stake top described in embodiment 1
Property rotational restraint experimental rig implement, include the following steps:
(1) Model Pile 600 is vertically placed among model casing 501 by allocation models soil 502；
(2) 600 stake top height of Model Pile is adjusted, so that separator box 301 is securely socketed on stake top, and be layered into model casing
Model clay 502 is filled, design height is densified to；
(3) first gear 205 and the engagement of second gear 206 are adjusted, guarantees torsion spring 207 and each junction switching performance
Well, non-loosening phenomenon；
(4) start hydraulic loading mechanism 304, horizontal loading applied to the stake top of Model Pile 600,
According to the mechanics of materials, every section of 207 torque of torsion springTAnd torsion angleαBetween relationship are as follows:
(1)
In formula,EFor the elasticity modulus of torsion spring, unit GPa；dFor the diameter of torsion spring material, unit m；D 0
For the initial diameter of torsion spring, unit m；N 0For the effective turn of torsion spring,αFor the corner of torsion spring, unit is
Degree；
The total torque of four sections of torsion springs 207T 1It is as follows:
(2)
According to gear set radius and 202 length relation of transmission rod, stake top inverted constraint moment of flexure can be obtainedMAre as follows:
(3)
In formula,rFor the radius of second gear, unit m；LFor the length of transmission rod, unit m；
In view of stake top corner is small, column joint can be in the strip through-hole of 202 second end of transmission rod in first gear 205
Interior movement is equivalent to the elongation of transmission rod 202, since the various displacements of this process are all smaller, therefore when calculating, still presses power transmission pole length
L remains unchanged calculating, and the displacement of 202 second end of transmission rod is approximately equal to the displacement of the lines of gear set, stake top cornerθAre as follows:
() (4)
In formula, △hFor the displacement of transmission rod second end；
Joint type (1) ~ (4), can obtainM and θRelational expression:
() (5)
In formula,kFor stake top rotational restraint.
Embodiment 3
The present embodiment combination specific value illustrates that stake top inverted constraint moment of flexure and stake top corner calculated in the present embodiment 2
Journey.Torsion spring 207 is carbon steel wire material, elastic modulus E 200GPa, initial diameter D0For 80mm, effective turn N0For
15, material diameter d are 8mm, and pinion gear radius r is 100mm, and power transmission pole length L is 500mm.
Above-mentioned parameter is substituted into the formula (5) in embodiment 2, stake top rotational restraint can be obtainedkFor
Therefore stake topM-θRelationship are as follows:。
As it can be seen that stake top inverted constraint moment of flexure and stake top corner are linearly proportional, thus for stake under stake top flexible constraint
Horizontal bearing characteristic provide means of testing.
The above is only the embodiment of the present invention, are not intended to limit the scope of the invention, all to be said using the present invention
Equivalent structure or equivalent flow shift made by bright book content is applied directly or indirectly in other relevant technical fields,
Similarly it is included within the scope of the present invention.
Claims (10)
1. a kind of stake top compliant rotational constrained test device, it is characterised in that: including guide rail bracket assembly, horizontal addload module and stake
Push up rotational restraint module；
The guide rail bracket assembly includes using the center line of Model Pile (600) as symmetrically arranged two crossbeams (101) of symmetry axis；
The stake top rotational restraint module is arranged between two crossbeams (101), including slides and connect with the crossbeam (101)
The curb girder (201) that connects and using the center line of the Model Pile (600) as symmetrically arranged two transmission rods (202) of symmetry axis,
Two groups of teeth wheel group and two groups of torsion spring groups；
The horizontal addload module includes electrohydraulic servo system, the separator box (301) for being set in Model Pile (600) stake top and sets
Set the bottom plate (302) between two crossbeams (101)；
The gear set include be arranged the first horizontal axis (203) between two curb girders (201) and the second horizontal axis (204) with
And it is respectively sleeved on first horizontal axis (203) and the second horizontal axis (204) and intermeshing first gear (205) and
Two gears (206)；
The second gear (206) is located at except the first gear (205) and diameter is less than the straight of the first gear (205)
Diameter；
The torsion spring group includes being set on second horizontal axis (204) and being located at the second gear (206) two sides
Two sections of torsion springs (207)；
The first end of the torsion spring (207) is fixed on the second gear (206), and it is horizontal that second end is fixed on described second
On axis (204) or the curb girder (201)；
The transmission rod (202) is concordant with the center of the first gear (205) and second gear (206), and first end is fixed on
On the separator box (301), second end is connect with the first gear (205)；
There are two load bar (303) for setting on the separator box (301)；
Two load bars (303) are located at the Model Pile (600) two sides, and end is plugged in the curb girder (201)
In groove, and the line of two load bars (303) is vertical with the line of two transmission rods (202)；
The electrohydraulic servo system includes being fixed on the bottom plate (302) and being symmetrically distributed in the transmission rod (202) two sides
Hydraulic loading mechanism (304)；
The telescopic end of the hydraulic loading mechanism (304) is hinged with the load bar (303).
2. stake top compliant rotational constrained test device according to claim 1, which is characterized in that the transmission rod (202)
Second end be provided with for the first gear (205) to be fastened on to interior snap-gauge (208)；
The strip through-hole that both ends are arc end is horizontally arranged on the snap-gauge (208)；
The column joint for being plugged in the strip through-hole is arranged in the two sides of the first gear (205).
3. stake top compliant rotational constrained test device according to claim 1 or 2, which is characterized in that the curb girder (201)
Groove be strip groove that both ends are arc end, and it is vertically arranged；
The end of the load bar (303) is cylindric.
4. stake top compliant rotational constrained test device according to claim 3, which is characterized in that the stake top rotational restraint
Module further includes spring clamp mechanism；
The spring clamp mechanism includes fixed block (209), the threaded rod (210) stretched out from the fixed block (209) and set
The spill spin block (211) being located on the threaded rod (210)；
It is provided with annular groove on the fixed block (209) and spill spin block (211) and section is semicircular connectivity slot；
The annular groove is arranged along the threaded rod (210)；
The first end of the connectivity slot is connected to the annular groove, and second end is arranged in the fixed block (209) or spill spin block
(211) edge.
5. stake top compliant rotational constrained test device according to claim 4, which is characterized in that the electrohydraulic servo system
It further include the data for acquiring the hydraulic loading mechanism (304) and the Electric signal processing by data feedback to external processor
Mechanism.
6. stake top compliant rotational constrained test device according to claim 1, which is characterized in that the first gear
(205) it is set on first horizontal axis (203) by first bearing；
The second gear (206) is set on second horizontal axis (204) by second bearing；
The inner ring of the first bearing and first horizontal axis (203) are interference fitted, outer ring and the first gear (205) interference
Cooperation；
The inner ring of the second bearing and second horizontal axis (204) are interference fitted, outer ring and the second gear (206) interference
Cooperation.
7. stake top compliant rotational constrained test device according to claim 5, which is characterized in that the guide rail bracket assembly is also
Including the half circular track (102) being arranged on the top and bottom of the crossbeam (101)；
The driving wheel (212) being slidably matched with the half circular track (102) is provided on the curb girder (201).
8. stake top compliant rotational constrained test device according to claim 7, which is characterized in that further include reaction frame；
The reaction frame includes support column (401) and Z-shaped support (402)；
The quantity of the support column (401) is four, and top is connect with the bottom surface of the crossbeam (101), and bottom end is fixed on support
On face；
The quantity of the Z-shaped support (402) is two, and setting is being connect with two crossbeams (101) and two adjacent branch respectively
Between dagger (401)；
The Z-shaped support (402) includes twice cross-brace and one of diagonal brace being arranged between twice cross-brace.
9. stake top compliant rotational constrained test device according to claim 8, which is characterized in that the guide rail bracket assembly,
Stake top rotational restraint module and reaction frame are made of Steel material.
10. a kind of stake top compliant rotational constrained test method, which is characterized in that the method is based on any one of claim 1-9
The stake top compliant rotational constrained test device is implemented, and includes the following steps:
Start hydraulic loading mechanism (304), horizontal loading applied to the stake top of Model Pile (600),
According to the mechanics of materials, every section of torsion spring (207) torqueTAnd torsion angleαBetween relationship are as follows:
(1)
In formula,EFor the elasticity modulus of torsion spring, unit GPa；dFor the diameter of torsion spring material, unit m；D 0To turn round
The initial diameter of square spring, unit m；N 0For the effective turn of torsion spring；αFor the corner of torsion spring, unit is degree；
The total torque of four sections of torsion springs (207)T 1It is as follows:
(2)
According to gear set radius and transmission rod (202) length relation, stake top inverted constraint moment of flexure can be obtainedMAre as follows:
(3)
In formula,rFor the radius of second gear, unit m；LFor the length of transmission rod, unit m；
In view of stake top corner is small, the displacement of transmission rod (202) second end is approximately equal to the displacement of the lines of gear set, stake top turns
AngleθAre as follows:
() (4)
In formula, △hFor the displacement of transmission rod second end；
Joint type (1) ~ (4), can obtainM and θRelational expression:
() (5)
In formula,kFor stake top rotational restraint.
Priority Applications (1)
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| KR20150070843A (en) * | 2013-12-17 | 2015-06-25 | 건국대학교 산학협력단 | Micro pile construction method for horizontal capacity increasing |
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