CN208056133U - A kind of experimental rig of unitary variant assessment tapered pile anti_freeze uplift performance - Google Patents
A kind of experimental rig of unitary variant assessment tapered pile anti_freeze uplift performance Download PDFInfo
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- CN208056133U CN208056133U CN201820034546.2U CN201820034546U CN208056133U CN 208056133 U CN208056133 U CN 208056133U CN 201820034546 U CN201820034546 U CN 201820034546U CN 208056133 U CN208056133 U CN 208056133U
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Abstract
The utility model discloses the experimental rigs that a kind of permafrost region unitary variant assesses tapered pile anti_freeze uplift performance, it includes test specimen tube, fixing bracket and pedestal for fixing test specimen tube, freezing liquid circulation pipe is equipped with below test specimen tube, side is equipped with moisture transducer, the other side equipped with temperature sensor on test specimen tube inner wall；The top of pile body sample is equipped with load transducer, fixing bracket top is equipped with crossbeam, the crossbeam includes A-frame and the trapezoidal stress dispersion cushion block between load transducer and A-frame, and the displacement sensor for monitoring beam deformation being fixed on loading device is equipped with above A-frame.This unitary variant of cone angle is only considered when being tested using this experimental rig, this unitary variant of change cone angle measures, avoid the influence of weight and pile body lateral area to pile body anti_freeze uplift performance, it can accurately, reasonably obtain influence of the different cone angle to pile body anti_freeze uplift performance, there is directive significance to the construction of Practical Project.
Description
Technical field
The utility model is related to the experimental rigs that a kind of unitary variant assesses tapered pile anti_freeze uplift performance, more specifically,
It refer to a kind of experimental rig of permafrost region unitary variant cone angle assessment tapered pile anti_freeze uplift performance.
Background technology
China's frozen soil is widely distributed, and frozen soil area accounts for about 3/4ths of national territorial area, and with the propulsion of construction, China exists
Frozen soil section planning and the infrastructure built are also more and more, and the problem of appearance is also more and more, wherein the lifting by frost disease of pile foundation
Evil problem be exactly one of them it is extremely important and be difficult solve the problems, such as.Tapered pile is as a kind of novel pile foundation, freeze proof
Good effect is shown in terms of the timeliness pulled out, but one is obtained not yet for the anti_freeze uplift mechanism of taper pile foundation at present
A unified conclusion, so the anti_freeze uplift mechanism of taper pile foundation is studied from the angle of quantitative theory analysis, for
The development of China's frozen soil engineering has very important value.
Currently, relatively more for the research of tapered pile both at home and abroad, although be directed to the resistance to plucking effect of different cone angle respectively from
Laboratory test, field test and numerical simulation are analyzed, but the research in relation to tapered pile at present is not using cone angle as single
One variable is analyzed, and when analysis does not consider the influence of gravity and pile body lateral area to lifting by frost power, therefore the cone angle that analysis obtains
Accuracy with the relationship of pile body anti_freeze uplift performance is difficult with convincingness.Therefore, it is necessary to be directed to existing experimental rig, design
Go out a kind of novel experimental rig to measure influence of this unitary variant of cone angle to taper pile body anti_freeze uplift performance.
Invention content
The technical problems to be solved in the utility model is for current permafrost region tapered pile cone angle to pile body anti_freeze uplift performance
Influence, provide a kind of and consider tapered pile anti_freeze uplift Performance Evaluation experimental rig of the cone angle as unitary variant, can be with
Accurately, influence of the different cone angle to pile body anti_freeze uplift performance is reasonably obtained.
In order to solve the above technical problems, the technical solution adopted in the utility model is：A kind of permafrost region unitary variant assessment
The experimental rig of tapered pile anti_freeze uplift performance, key technology are：It includes test specimen tube, the fixed branch for fixing test specimen tube
Frame and the pedestal of the pile body sample lower part in test specimen tube, the test specimen tube lower section are equipped with freezing liquid circulation pipe, the examination
Side is equipped with moisture transducer on sample cylinder inner wall, the other side is equipped with temperature sensor；The top of pile body sample is sensed equipped with load
Device, the fixing bracket top be equipped with crossbeam, the crossbeam include the A-frame being fixed on fixing bracket and be set to load
Trapezoidal stress between sensor and A-frame disperses cushion block, is equipped with and is fixed on loading device above the A-frame
Displacement sensor for monitoring beam deformation.
Preferably, the pile body specimen height is 25~35cm, and axis of small circle is 2~8cm, and cone angle is 0~11 °；Stake
Light polyurethane foam is equipped in body sample.
Preferably, pile body sample periphery soil sample use heave susceptibility soil silty clay, compaction Control be 93%~
97%, shaving and be layered hit reality；Soil sample is filled in the process every the embedding moisture transducer of 10cm, every 5~6cm embedding one
Root temperature sensor.
Preferably, the pile body sample on the basis of 0 ° of stake need to scratch except design to pile body volume；
When carrying out pile body design, ensure that pile body side surface area is equal first, i.e.,
dθ=d0-h tanθ
Secondly, the volume that the pile body is carried out according to calculated diameter calculates, i.e.,
Again, it due to requiring the quality of different cone angle pile body equal, carries out excavating volume according to calculated pile body volume
Calculating, i.e.,
Vθ is dug=Vθ-V0
Finally, according to the specification excavated volume and determine cutouts being calculated, i.e.,
Wherein, d0For the diameter (unit cm) of 0 ° of stake, dθFor the axis of small circle (unit cm) for the tapered pile that angle is θ,
H is the height (unit cm) of pile body, and θ is the angle (unit is °) of tapered pile, VθFor the volume (list for the tapered pile that cone angle is θ
Position is cm3), V0For volume (the unit cm of 0 ° of stake3), Vθ is dugThe tapered pile for being θ for cone angle needs the volume excavated (unit is
cm3), hθ is dugThe tapered pile for being θ for cone angle needs the height (unit cm) excavated, dθ is dugThe tapered pile needs for being θ for cone angle are excavated
Axis of small circle (unit cm).
It is using advantageous effect caused by above-mentioned technical proposal：
(1) only consider this unitary variant of cone angle when using the experiment of this experimental rig, change this unitary variant of cone angle into
Row measures, and avoids the influence of weight and pile body lateral area to pile body anti_freeze uplift performance, can accurately, reasonably obtain different cones
Influence of the angle to pile body anti_freeze uplift performance has directive significance to the construction of Practical Project；
(2) the utility model is suitable for laboratory test and the cone angle of the middle-size and small-size pile foundation of test in situ is freeze proof to pile body
Pull out the test of performance influence.
Description of the drawings
Fig. 1 is the structural schematic diagram of the utility model；
Fig. 2 is pile body sample side view in the utility model；
Fig. 3 is 5 ° of pile body sample side views in the utility model；
Fig. 4 is 9 ° of pile body sample side views in the utility model；
Wherein:1-1, moisture transducer；1-2, pile body anti_freeze uplift performance test experimental apparatus (cryostat dish in dismounting)；1-3,
Crossbeam；1-4, displacement sensor；1-5, load transducer；1-6, temperature sensor；1-7, test specimen tube；1-8, freezing liquid cycle
Pipe；2-1, pile body sample；2-2, polyurethane foam；
Specific implementation mode
It is new with reference to this practicality to make the above-mentioned purpose of the utility model, feature and advantage can be more obvious and easy to understand
Drawings and examples in type, are clearly and completely described the technical solution of the utility model.Obviously, described reality
A part of the embodiment that example is only the utility model is applied, instead of all the embodiments.Based on the implementation in the utility model
Example, every other embodiment obtained by those of ordinary skill in the art without making creative efforts belong to
The range of the utility model protection.
The utility model provides a kind of new approaches that test cone angle influences pile body anti_freeze uplift performance, and this method passes through only
This unitary variant of change cone angle measures, and avoids the influence of weight and pile body lateral area to pile body anti_freeze uplift performance.This
Experimental rig in utility model is improved based on existing pile body anti_freeze uplift performance testing device, referring to attached drawing 1, such as
Number of patent application is 2015102967574, entitled " a kind of pile body anti_freeze uplift performance test experimental apparatus and its experimental method "
In pile body anti_freeze uplift performance test experimental apparatus.
It includes specific taper pile body sample and improved novel pile body anti_freeze uplift performance testing device.It improves
Pile body anti_freeze uplift performance testing device include former pile body anti_freeze uplift performance testing device (top cryostat pan portion of dismantling
Point), various sensors and displacement constraint bracing means, displacement constraint bracing means is to be welded with trapezoidal stress to disperse cushion block and triangle
The stainless gooseneck of holder.When carrying out the measurement of lifting by frost power, the crossbeam of trapezoidal stress dispersion cushion block and A-frame is added, and is increased
Add the displacement sensor of monitoring beam deformation；When carrying out lifting by frost displacement measurement, stake top directly arranges displacement sensor stake
The lifting by frost displacement of body.
Specially：Referring to attached drawing 1 comprising test specimen tube 1-7, the fixing bracket 1-2 for fixing test specimen tube 1-7 and
The pedestal of the lower parts pile body sample 2-1 in test specimen tube 1-7, the lower sections test specimen tube 1-7 are equipped with freezing liquid circulation pipe 1-8,
The difference is that side is equipped with moisture transducer 1-1 on the test specimen tube inner wall, the other side is equipped with temperature sensor 1-6；Pile body tries
The top of sample 2-1 is equipped with load transducer 1-5, and the fixing bracket top is equipped with crossbeam, which includes being fixed on fixed branch
A-frame on frame and the trapezoidal stress between load transducer 1-5 and A-frame disperse cushion block, the triangle
The displacement sensor 1-4 for monitoring beam deformation being fixed on loading device is equipped with above holder.
To keep this experimental rig inner conical pile body anti_freeze uplift significant effect, soil around pile sample glutinous using heave susceptibility soil silty
Soil, compaction Control are 93%~97%, and shaving is simultaneously layered and hits reality, is passed every the embedding moisture of 10cm during filling soil sample
Sensor 1-1, every the embedding temperature sensor 1-6 of 5~6cm.To ensure the Unidirectional Freezing of tapered pile, normal direction frost heave need to be eliminated
Influence of the power to pile body ensures that pile body bottom perseverance is 1 DEG C by freezing liquid circulation pipe 1-8.The data of various sensors can be used
DT85 data collectors are acquired.
Referring to attached drawing 2, the pile body sample 2-1 height be 25~35cm, axis of small circle be 2~8cm, cone angle be 0~
11 °, to ensure this unitary variant of cone angle, pile body volume need to be repaiied in the case where ensureing that pile body side surface area is constant
Change.
When carrying out pile body anti_freeze uplift performance test, to ensure that cone angle is the unitary variant of experiment, it is ensured that pile quality, height
Degree, stress lateral area are constant, on the basis of 0 ° of stake need to scratch except design to pile body volume.
When carrying out the measurement of lifting by frost power, the trapezoidal stress dispersion block purpose added is so that counter-force crossbeam avoids generating stress collection
In；The A-frame purpose added is so that the rigidity of counter-force crossbeam becomes larger；The purpose of the displacement sensor 1-4 added is monitoring
Beam deformation is to ensure crossbeam zero shift；It when carrying out lifting by frost displacement measurement, needs to remove reaction frame, displacement sensor effect is
Measure pile body lifting by frost displacement.
The experiment that unitary variant assesses tapered pile anti_freeze uplift performance is carried out using above-mentioned pile body sample, specific steps are such as
Under：
The first step：Prepare test pile；Pile body sample 2-1 height is 25~35cm, and axis of small circle is 2~8cm, and cone angle is
0~11 °, to ensure this unitary variant of cone angle, pile body volume need to be carried out in the case where ensureing that pile body side surface area is constant
Modification.As shown in Fig. 2, to ensure that cone angle is the unitary variant of experiment, it is ensured that pile quality, height, stress lateral area are constant, need
Pile body volume on the basis of 0 ° of stake scratch except design.Ensure that pile body side surface area is equal first, i.e.,
dθ=d0-h tanθ
Secondly, the volume that the pile body is carried out according to calculated diameter calculates, i.e.,
Again, it due to requiring the quality of different cone angle pile body equal, carries out excavating volume according to calculated pile body volume
Calculating, i.e.,
Vθ is dug=Vθ-V0
Finally, according to the specification excavated volume and determine cutouts being calculated, i.e.,
Wherein, d0For the diameter (unit cm) of 0 ° of stake, dθFor the axis of small circle (unit cm) for the tapered pile that angle is θ,
H is the height (unit cm) of pile body, and θ is the angle (unit is °) of tapered pile, VθFor the volume (list for the tapered pile that cone angle is θ
Position is cm3), V0For volume (the unit cm of 0 ° of stake3), Vθ is dugThe tapered pile for being θ for cone angle needs the volume excavated (unit is
cm3), hθ is dugThe tapered pile for being θ for cone angle needs the height (unit cm) excavated, dθ is dugThe tapered pile needs for being θ for cone angle are excavated
Axis of small circle (unit cm).
Scratch except volume shape be with angle tapered pile, scratch except tapered pile size needs basis excavate volume into
Row calculates, and fills intensity after excavating and meet the requirements, and the light polyurethane foam with heat preservation and fire resistance characteristic.
Second step：Embedding test pile；Pile body is positioned in experimental provision, to keep this experimental rig inner conical pile body freeze proof
Significant effect is pulled out, it is 93%~97% that soil around pile sample, which uses heave susceptibility soil silty clay, compaction Control, and shaving is simultaneously layered
Reality is hit, filling soil sample is in the process every the embedding moisture transducer 1-1 of 10cm, every the embedding temperature sensor of 5~6cm
1-6；
Third walks：Pile body lifting by frost power is tested during Unidirectional Freezing；Guarantee test device Unidirectional Freezing simultaneously uses counter-force steel
Frame and load transducer measure lifting by frost power, as shown in Figure 1, to eliminate the influence of Normal frost heave, it is ensured that pile body bottom freeze
Liquid circulation pipe temperature perseverance is 1 DEG C, sample bucket periphery is wrapped up using heat-preservation cotton, and a whole set of experimental rig is placed in high/low temperature alternation
In Frozen-thawed cycled case, carries out cooling and freeze；
4th step：The content for repeating second step and third step, obtains the size of the pile body lifting by frost power under different cone angle.
By above-mentioned experiment process, cone angle this unitary variant is only changed, and then obtain different cone angle to pile body lifting by frost
The influence of power avoids the influence of pile body lateral area and pile body weight to test result so that test data is more accurate.
The above process is the relationship measured between lifting by frost power and cone angle, if removing counter-force steelframe and load in the third step
Displacement sensor is directly laid in stake top and repeats the first step to the 4th step, can accurately obtain cone angle to stake by sensor
The influence of body lifting by frost displacement.
Not only influence of this unitary variant of measurable cone angle to pile body lifting by frost power of this experimental rig, but also cone angle is can measure to stake
The influence of body lifting by frost displacement, but two kinds of test method processes are similar, below only in conjunction with embodiment 1 to this unitary variant pair of cone angle
The experiment process that pile body lifting by frost power influences is illustrated.
Embodiment 1：
The first step：Prepare test pile；It is (2~8) cm that pile body specimen height, which takes 30cm, axis of small circle, and cone angle takes respectively
It 0 °, 5 °, 9 ° and 11 °, need to be in the case where ensureing that pile body side surface area is constant, to pile body to ensure this unitary variant of cone angle
Volume is modified.As shown in Fig. 2, to ensure that cone angle is the unitary variant of experiment, it is ensured that pile quality, height, stress side
Product is constant, on the basis of 0 ° of stake need to scratch except design to pile body volume.Ensure that pile body side surface area is equal, takes 0 ° of stake first
A diameter of 8cm ensures that pile body side surface area is equal, i.e., first
dθ=d0-h tanθ
Secondly, the volume that the pile body is carried out according to calculated diameter calculates, i.e.,
Again, it due to requiring the quality of different cone angle pile body equal, carries out excavating volume according to calculated pile body volume
Calculating, i.e.,
Vθ is dug=Vθ-V0
Finally, according to the specification excavated volume and determine cutouts being calculated, i.e.,
Wherein, d0For the diameter (unit cm) of 0 ° of stake, dθFor the axis of small circle (unit cm) for the tapered pile that angle is θ,
H is the height (unit cm) of pile body, and θ is the angle (unit is °) of tapered pile, VθFor the volume (list for the tapered pile that cone angle is θ
Position is cm3), V0For volume (the unit cm of 0 ° of stake3), Vθ is dugThe tapered pile for being θ for cone angle needs the volume excavated (unit is
cm3), hθ is dugThe tapered pile for being θ for cone angle needs the height (unit cm) excavated, dθ is dugThe tapered pile needs for being θ for cone angle are excavated
Axis of small circle (unit cm).
Scratch except volume shape be with angle tapered pile, scratch except tapered pile size needs basis excavate volume into
Row calculates, and fills intensity after excavating and meet the requirements, and the light polyurethane foam 2-2 with heat preservation and fire resistance characteristic.Institute
The data of calculating such as table 1-1, designed 5 ° of stakes such as Fig. 3, designed 9 ° of stake such as Fig. 4.
Table 1-1 pile body specification tables
Second step：Embedding test pile；Pile body is positioned over 1-2 in experimental provision, to make this experimental rig inner conical pile body
Anti_freeze uplift significant effect, it is 93%~97% that soil around pile sample, which uses heave susceptibility soil silty clay, compaction Control, and shaving is simultaneously
Reality is hit in layering, and filling soil sample is in the process every the embedding moisture transducer 1-1 of 10cm, every the embedding temperature of (5~6) cm
Sensor 1-6；
Third walks：Pile body lifting by frost power is tested during Unidirectional Freezing；Ensure experimental provision Unidirectional Freezing and uses counter-force steel
Frame 1-3 and load transducer 1-5 measure lifting by frost power, as shown in Figure 1, to eliminate the influence of Normal frost heave, it is ensured that pile body bottom
Portion's freezing liquid circulation pipe 1-8 temperature perseverances be 1 DEG C, and on reaction frame cloth displacement sensor 1-4 to monitor the displacement of reaction frame
Sample bucket periphery is wrapped up using heat-preservation cotton, and a whole set of experimental rig is placed in high/low temperature alternation Frozen-thawed cycled case by situation, into
Row cooling is freezed；
4th step：4th step：The content for repeating second step and third step, obtains the big of the pile body lifting by frost power under different cone angle
It is small.
The utility model mainly solves in addition to cone angle this variable, influence of the dependent variable to pile body anti_freeze uplift performance
Problem.The stingy method except the different size of volume of tapered pile that this experiment is taken can be to avoid stake side surface area and stake again to pile body
The influence of anti_freeze uplift performance more specific can observe influence of this unitary variant of cone angle to pile body anti_freeze uplift performance.
The foregoing description of the disclosed embodiments enables professional and technical personnel in the field to realize or use this practicality new
Type is created.Various modifications to these embodiments will be apparent to those skilled in the art, herein
Defined General Principle can be in the case where not departing from the spirit or scope of the utility model creation, in other embodiments
It realizes.Therefore, the utility model creation is not intended to be limited to the embodiments shown herein, and is to fit to and this paper institutes
Principle disclosed and the consistent widest range of features of novelty.
Claims (3)
1. a kind of experimental rig of unitary variant assessment tapered pile anti_freeze uplift performance comprising test specimen tube (1-7) is tried for fixed
The fixing bracket (1-2) of sample cylinder (1-7) and the pedestal of lower part pile body sample (2-1) in test specimen tube (1-7), the examination
Freezing liquid circulation pipe (1-8) is equipped with below sample cylinder (1-7), it is characterised in that：Side is passed equipped with moisture on the test specimen tube inner wall
Sensor (1-1), the other side are equipped with temperature sensor (1-6)；The top of pile body sample (2-1) is equipped with load transducer (1-5), institute
State fixing bracket top be equipped with crossbeam, the crossbeam include the A-frame being fixed on fixing bracket and be set to load transducer
The trapezoidal stress of (1-5) between A-frame disperses cushion block, is equipped with and is fixed on loading device above the A-frame
Displacement sensor (1-4) for monitoring beam deformation.
2. the experimental rig of unitary variant assessment tapered pile anti_freeze uplift performance according to claim 1, it is characterised in that：Institute
It is 25~35cm to state pile body sample (2-1) highly, and axis of small circle is 2~8cm, and cone angle is 0~11 °；It is equipped in pile body sample
Light polyurethane foam (2-2).
3. the experimental rig of unitary variant assessment tapered pile anti_freeze uplift performance according to claim 1, it is characterised in that：Stake
It is 93%~97% that the periphery body sample (2-1) soil sample, which uses heave susceptibility soil silty clay, compaction Control, and shaving is simultaneously layered
Hit reality；Soil sample is filled in the process every the embedding moisture transducer (1-1) of 10cm, every the embedding temperature sensing of 5~6cm
Device (1-6).
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| CN201820034546.2U CN208056133U (en) | 2018-01-09 | 2018-01-09 | A kind of experimental rig of unitary variant assessment tapered pile anti_freeze uplift performance |
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| CN201820034546.2U CN208056133U (en) | 2018-01-09 | 2018-01-09 | A kind of experimental rig of unitary variant assessment tapered pile anti_freeze uplift performance |
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| Publication Number | Publication Date |
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| CN208056133U true CN208056133U (en) | 2018-11-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112064627A (en) * | 2019-06-10 | 2020-12-11 | 中国科学院寒区旱区环境与工程研究所 | Freeze-proofing taper cylinder pile foundation in frozen soil area and construction process thereof |
-
2018
- 2018-01-09 CN CN201820034546.2U patent/CN208056133U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112064627A (en) * | 2019-06-10 | 2020-12-11 | 中国科学院寒区旱区环境与工程研究所 | Freeze-proofing taper cylinder pile foundation in frozen soil area and construction process thereof |
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