CN110284533A - Cast-in-place concrete pile stake week thermo parameters method measures experimental rig and method - Google Patents
Cast-in-place concrete pile stake week thermo parameters method measures experimental rig and method Download PDFInfo
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- CN110284533A CN110284533A CN201910552820.4A CN201910552820A CN110284533A CN 110284533 A CN110284533 A CN 110284533A CN 201910552820 A CN201910552820 A CN 201910552820A CN 110284533 A CN110284533 A CN 110284533A
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
- G01K13/10—Thermometers specially adapted for specific purposes for measuring temperature within piled or stacked materials
Abstract
The invention discloses a kind of cast-in-place concrete pile stake week thermo parameters method of cast-in-place concrete pile technical field measurement experimental rig and methods, it is intended to which the testing cost for solving stake week temperature field in the prior art is high, the low technical problem of detection accuracy.Soil box is mounted in heat insulation pedestal, heat-insulated top plate is mounted on soil box, thermal insulation layer is wrapped up outside soil box, there is cast-in-place concrete pile at center, filling soil between soil box and cast-in-place concrete pile, concrete temperature sensor is set inside cast-in-place concrete pile, soil temperature sensor is set inside soil, concrete temperature sensor and soil temperature sensor will test data and be transferred to data logging computers.Device and method of the present invention can simulate a variety of soil property environment and concrete-pile in the lab, reduce testing cost, and flexibility is promoted with economy, and measurement process is controlled by computer, and measurement accuracy is high；Using heat-barrier material, influence of the laboratory ambient temperature to thermo parameters method situation is improved significantly.
Description
Technical field
The invention belongs to cast-in-place concrete pile technical fields, and in particular to a kind of cast-in-place concrete pile stake week thermo parameters method
Measure experimental rig and method.
Background technique
Expanding branch grouting pile is a kind of Novel pile foundation technology, is by pile body, chassis, mid-game, top plate and several branches
Composition has been taken into account and has been required of both economic benefit and difficulty of construction.Compared to common cast-in-place concrete pile, support disk pile exists
There is better mechanical property in practical application, it is adaptable, basic expense can be saved, shortens the construction period and can produce significant economy
Benefit.
The force-mechanism for changing to the branch essence of compacted bearing disk pile pile foundation improves the bearing capacity of pile foundation, prevents
The performances such as deformation.Therefore extruding-enlarging branch tray pile body bearing capacity be largely dependent upon branch at disk diameter and quality.And branch
Stake formation of pile is all in hidden place, it is difficult to detect work progress and pile quality.And pile foundation is the basis of building, once
Basic unstability, will result in the destruction of monolithic architecture object, and the importance of detection of pier foundation is self-evident.Currently, the side of detection of pier foundation
Method mainly has low strain dynamic method, sound wave transmission method, core drilling method, Large strain method etc..Existing method such as low strain dynamic method can be because of bored concrete pile
Lateral dimension effect, will cause the distortion of response wave shape, stake diameter is bigger, be distorted it is more serious.For another example sound wave transmission method is to Party A
It increases testing cost and buries the trouble of sonic tube processed, and detection efficiency is low, detection range is small.
In view of the incomplete of existing pile measurement method, the invention discloses one kind for cast-in-place concrete pile stake in laboratory
All thermo parameters methods measures experimental rig, by by instrument by filling concrete in soil box come simulation concrete grout pile
Column.By a series of sensors of connection temperature and humidity etc., to realize under observation and record various soil mass Parameter Conditions concrete in bored concrete pile
Because of the heat transmitting and distribution over time and space of aquation release, the transmitting and distribution relation obtained with theory is compared
And correction, obtain it is a set of it is practical can be used for production practices about the distribution of bored concrete pile pile body heat and transitive relation
Method.
Summary of the invention
The purpose of the present invention is to provide a kind of cast-in-place concrete pile stake week thermo parameters methods to measure experimental rig and method,
High, the low technical problem of detection accuracy with the testing cost for solving stake week temperature field in the prior art.
In order to achieve the above objectives, the technical scheme adopted by the invention is that: a kind of cast-in-place concrete pile stake week temperature field point
Cloth measures experimental rig, including heat insulation pedestal, soil box are mounted in heat insulation pedestal, and heat-insulated top plate is mounted on soil box, the soil
Thermal insulation layer is wrapped up outside slot, there is cast-in-place concrete pile at the center of the soil box, filling soil between soil box and cast-in-place concrete pile,
Multiple concrete temperature sensors are set inside the cast-in-place concrete pile, multiple soil moisture sensings are set inside the soil
Device, the concrete temperature sensor and soil temperature sensor will test data and be transferred to data logging computers, the number
Environment temperature is obtained by external temperature sensor according to logger computer.
The cast-in-place concrete pile includes no-reinforcing-bar cage concrete bored concrete pile, has steel reinforcement cage cast-in-place concrete pile；Work as use
When having steel reinforcement cage cast-in-place concrete pile, reinforcing bar temperature sensor is set, reinforcing bar temperature sensor will test data biography on steel reinforcement cage
It is defeated by data logging computers.
The soil includes sand and/or clay.
The packed height of the soil and soil box are contour.
The soil box is the cylinder-shaped acrylic chest of a face back cover one side not back cover.
It further include cyclic annular water pipe, cyclic annular water pipe is mounted on inside soil box, and cyclic annular water pipe connects external water by two ports
Source, for manufacturing the soil for being in saturated mode.
A kind of cast-in-place concrete pile stake week thermo parameters method measurement method, comprising the following steps:
Experimental rig is assembled, including soil box is mounted in heat insulation pedestal, superscribes thermal insulation layer in soil box periphery, concrete is filled
Note device is fixed on soil box center, installs cyclic annular water pipe；
Filling soil, including prepared and banketed according to test requirements document selection, and adjust the water content banketed；
Cast-in-place concrete pile is made, including is determined whether that steel reinforcement cage is installed according to test requirements document, prepares satisfactory concrete,
Filling concrete device is taken out after injecting concrete into filling concrete device；
Mounting temperature sensor, including soil temperature sensor, concrete temperature sensor, reinforcing bar temperature are installed according to test requirements document
Spend sensor；
Heat-insulated top plate is mounted on soil box, each temperature sensor including external temperature sensor is connected to data note
Computer is recorded, data acquisition is started；
Change experimental condition, repeats the above steps；
Analyze test data.
The method of the filling soil includes: that will have determined that the uniform stirring that bankets of all kinds of Soil Parameters when filling out composite soil,
And it is uniformly layed between soil box and filling concrete device；When back-up sand soil, the sand of different compactness is prepared using the method for raining；It fills out
When clay, the clay of different overconsolidation ratios is prepared using preconsolidation method；The height of filling soil is equal with soil box.
The method for adjusting the water content banketed is:
If the experimental design soil body is unsaturated state, first using the water content in tensiometer measurement soil box everywhere, and according to
The Soil Parameters known calculate soil body saturation degree, judge whether it is unsaturated state, then check whether water content distribution is uniform, if
Water content distribution has not yet been reached uniformly, and processing test is used again bankets until water content distribution reaches uniformly；
If the experimental design soil body is saturated mode, it is placed on two ports connection external water source of the cyclic annular water pipe in soil box, so that
The soil body is slowly filled with water to sand face or more, keeps head constant at this time, is saturated the soil body sufficiently and stands consolidation 24 hours or more.
The concrete temperature sensor, reinforcing bar temperature sensor, the fitting depth of soil temperature sensor are equal and equal
On a certain radius of cast-in-place concrete pile.
Compared with prior art, advantageous effects of the invention:
(1) cast-in-place concrete pile stake week thermo parameters method measurement experimental rig of the present invention and method can be simulated in the lab
A variety of soil property environment and concrete-pile, substantially reduce testing cost, and flexibility is promoted with economy, and measurement process is by calculating
Machine control, measurement accuracy are high；
(2) cast-in-place concrete pile stake week thermo parameters method measurement experimental rig of the present invention uses heat-barrier material, changes significantly
It has been apt to influence of the laboratory ambient temperature to thermo parameters method situation, has greatly promoted the accuracy of test.
Detailed description of the invention
Fig. 1 is a kind of cast-in-place concrete pile stake week thermo parameters method measurement experimental rig provided in an embodiment of the present invention and side
Level of heat transport diagrammatic cross-section after the cylindrical concrete stake perfusion of method；
Fig. 2 is a kind of cast-in-place concrete pile stake week thermo parameters method measurement experimental rig provided in an embodiment of the present invention and method
Heat transmitting vertical cut-away schematic view after cylindrical concrete stake perfusion；
Fig. 3 is that a kind of solid of cast-in-place concrete pile stake week thermo parameters method measurement experimental rig provided in an embodiment of the present invention is cutd open
Face schematic diagram；
Fig. 4 is a kind of cyclic annular water of cast-in-place concrete pile stake week thermo parameters method measurement experimental rig provided in an embodiment of the present invention
Pipe schematic diagram；
Fig. 5 is that a kind of cast-in-place concrete pile stake week thermo parameters method measurement experimental rig provided in an embodiment of the present invention has reinforcing bar
The vertical cut-away schematic view of cage；
The temperature duration curve that Fig. 6 is the cast-in-place concrete pile stake diameter that obtains through the embodiment of the present invention when being R=0.1m；
The temperature duration curve that Fig. 7 is the cast-in-place concrete pile stake diameter that obtains through the embodiment of the present invention when being R=0.15m；
Fig. 8 is the temperature of cast-in-place concrete pile that the stake diameter that obtains through the embodiment of the present invention is R=0.1m under different analysis durations
Spend distribution curve；
In figure: 1. heat insulation pedestals；2. heat-insulated top plate；3. soil box；4. thermal insulation layer；5. cast-in-place concrete pile；6. concrete temperature passes
Sensor；7. soil temperature sensor；8. external temperature sensor；9. reinforcing bar temperature sensor；10. data logging computers；11.
Cyclic annular water pipe.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.Following embodiment is only used for clearly illustrating the present invention
Technical solution, and not intended to limit the protection scope of the present invention.
It should be noted that in the description of the present invention, term "front", "rear", "left", "right", "upper", "lower", "inner",
The orientation or positional relationship of the instructions such as "outside" is to be merely for convenience of description originally based on orientation or positional relationship shown in the drawings
It invents rather than requires the present invention that must be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.
Term "front", "rear" used in present invention description, "left", "right", "upper", "lower" refer to the direction in attached drawing, term
"inner", "outside" refer respectively to the direction towards or away from geometric center of specific component.
As shown in figure 3, figure 4 and figure 5, a kind of for cast-in-place concrete pile stake week thermo parameters method measurement test in laboratory
Device, including cast-in-place concrete pile, heat insulation pedestal, heat-insulated top plate, soil box and thermal insulation layer.Soil box is mounted in heat insulation pedestal, every
Hot mounting of roof plate wraps up thermal insulation layer, heat insulation bottom board, heat-insulated top plate, thermal insulation layer are using thermal insulation on soil box outside soil box
Good EPE pearl wool material of the same race, heat-barrier material can make the temperature in device during the test not by environment temperature wave
Dynamic influence.There is cast-in-place concrete pile at the center of soil box, and multiple concrete temperature sensors are arranged inside cast-in-place concrete pile, use
In real-time measurement cast-in-place concrete pile different parts be temperature；When being equipped with steel reinforcement cage in cast-in-place concrete pile, set on steel reinforcement cage
Reinforcing bar temperature sensor is set for measuring the real time temperature of reinforcing bar in steel reinforcement cage.Filling meets between soil box and cast-in-place concrete pile
Multiple soil temperature sensors are arranged in the soil of test requirements document, including sand, clay, composite soil, soil inside, for surveying in real time
Measure the soil moisture of different parts.Concrete temperature sensor and soil temperature sensor will test data and be transferred to data record
Computer, the data logging computers obtain environment temperature by external temperature sensor, and record ambient temperature change
Change.According to the difference of test requirements document, cyclic annular water pipe is equipped with inside soil box, cyclic annular water pipe connects external water by two ports
Source, for manufacturing the soil for being in saturated mode.
Soil box is diameter 200cm in the present embodiment, the cylinder acrylic case of a face back cover one side of high 20cm not back cover
The back cover face of son, soil box is arranged on heat insulation pedestal, is wrapped up with thermal insulation layer within one week, and top is covered using heat-insulated top plate, is prevented
Internal during test there are heats to exchange with the external world, influences test effect.
Filling concrete device is placed in soil box center when test, filling concrete device is the not closed cylinder in two bottom surfaces
Shape acrylic bucket, using filling concrete device can make cast-in-place concrete pile be formed and prevent test banket perfusion when unstability collapse
It falls into.The center of filling concrete device one side is overlapped and is fixed with the center of soil box bottom, after fixing will test sand or
Clay paving fills between soil box and filling concrete device, and test sand and soil box are contour；By filling concrete device by coagulation
Soil drainage is in perfusion position, and concrete should be slightly above soil box height at this time, because of coagulation soil flow after can preventing syringe from extracting
It moves property and collapses under the depth of fill.
The round stake of tri- kinds of diameters of diameter 30cm, 50cm, 70cm is respectively adopted in cast-in-place concrete pile in test, it is contemplated that its
It can be using the sand of strength grade different concrete and different parameters or clay etc. when his factor is to temperature profile effect；If
In view of steel reinforcement cage there are the case where when, steel reinforcement cage is designed according to the size of cast-in-place concrete pile.
One kind is for grout pile week thermo parameters method measurement experiment method in laboratory, comprising the following steps:
A, experimental rig is assembled, including soil box is mounted in heat insulation pedestal, superscribes thermal insulation layer in soil box periphery, use is heat-insulated
The heat-barrier material to work well improves influence of the laboratory ambient temperature to thermo parameters method situation significantly, greatly promotes
The accuracy of test.Overall diameter is highly stably fixed at soil box with a thickness of y cm for x cm for the filling concrete device of z cm
Cyclic annular water pipe is installed at center.
B, filling soil, including prepared and banketed according to test requirements document selection, and adjust the water content banketed；
When filling out composite soil, the uniform stirring that bankets of all kinds of Soil Parameters will be had determined that, and be uniformly layed in soil box and concrete filling
It infuses between device；When back-up sand soil, the sand of different compactness is prepared using the method for raining；When filling out clay, prepared using preconsolidation method
The clay of different overconsolidation ratios；The height of filling soil is equal with soil box；
If the experimental design soil body is unsaturated state, first using the water content in tensiometer measurement soil box everywhere, and according to
The Soil Parameters known calculate soil body saturation degree, judge whether it is unsaturated state, then check whether water content distribution is uniform, if
Water content distribution has not yet been reached uniformly, and processing test is used again bankets until water content distribution reaches uniformly；
If the experimental design soil body is saturated mode, it is placed on two ports connection external water source of the cyclic annular water pipe in soil box, so that
The soil body is slowly filled with water to sand face or more, keeps head constant at this time, is saturated the soil body sufficiently and stands consolidation 24 hours or more.
C, cast-in-place concrete pile is made, including is determined whether that steel reinforcement cage is installed according to test requirements document, is prepared satisfactory
Concrete takes out filling concrete device after injecting concrete into filling concrete device；
, to a little higher than soil box height, percussion or vibration coagulation will be used in the concrete penetration concrete syringe for having determined that parameter
The mode of native syringe carrys out concrete compacted by jolting until bubble-free is emerged, and slow at this time to extract filling concrete device out, concrete is slowly
Gap in flowing and being sufficient filling with the concrete as caused by the thickness of filling concrete device and banket, scrapes off after being filled up completely
The extra concrete in top ultimately forms cast-in-place concrete pile, and diameter is equal with the overall diameter of filling concrete device, highly with
Soil box height is equal, if consider that steel reinforcement cage has the influence to thermo parameters method, under increasing before perfusion the step for cage, and steel
Muscle cage should place center position.
D, mounting temperature sensor, including according to test requirements document install soil temperature sensor, concrete temperature sensor,
Reinforcing bar temperature sensor；
Multiple concrete temperature sensors are placed in filling concrete pilespacing pile center different distance by the design of testing programdiCm(i=1,2,3 ... n n and correspondingdiAccording to plan design assignment) and identical depthh At cm；It will be multiple
Soil temperature sensor is placed in by the design of testing program banket in away from pile center's different distancediCm and same depthh cm
Place, if there is the influence to thermo parameters method in view of steel reinforcement cage, it should which depth is on steel reinforcement cagehCertain point is put at cm
Set reinforcing bar temperature sensor.All temperature sensors are arranged on the same radius of cast-in-place concrete pile, with detection with
Increase at a distance from cast-in-place concrete pile, the variation tendency of temperature, as shown in Figure 1 and Figure 2.
E, heat-insulated top plate is mounted on soil box, each temperature sensor including external temperature sensor is connected to
Data logging computers start data acquisition；
By heat-insulated top plate enclosing cover on soil box, and check whether whole device thermal insulation layer each section is bonded closely, if there are
Gap can be filled with other heat-barrier materials and be sealed, and external temperature sensor is placed in around device at this time, is remembered by data
Record computer changes with time to record each temperature sensor institute measured data, until obtained temperature field data no longer becomes
Change, obtain at this time one group grout pile week thermo parameters method physical model.After starting the measurements, computer will monitor in real time
The data of all temperature sensors can meet at computer with full powers since total test period is longer to record data, so that
Test process convenience and high-efficiency.
F, change experimental condition, repeat the above steps；
Change the label of cast-in-place concrete pile and the Soil Parameters or temperature of size, sand or clay according to the design of testing program
The placement location of sensor, repeats the above steps, and obtains multiple groups test data.
G, test data is analyzed；Analyze grout pile week thermo parameters method with concrete grade, bored concrete pile size, sand or
Or not that glutinous soil's water content and steel reinforcement cage are arranged wait the situation of change of variables.
In the case where other conditions are constant, step a ~ d is carried out 3 times altogether, for the first time x=30cm when progress step a ~ d, and y=
1cm, z=25cm；X=50cm, y=1cm, z=25cm when second of progress step a ~ d；Third time carries out x=70cm, y when step a ~ d
=1cm, z=25cm.It is noted that the size of all piles and back-up sand that provide in this specification, parameter can be according to differences
Testing program be designed and modify, size provided herein is intended only as referring to parameter.
Be listed below the temperature field obtained through this embodiment several groups of actual measurement charts and two groups of comparative analyses, wherein owning
Temperature data is the knots modification of measured data Yu initial time data.
(1) temperature duration curve
The concrete-pile of stake diameter 0.2m label C20, back-up sand are the temperature duration curve under conditions of 1.38 kg/m3 fine sand of density
It is as shown in Figure 6 and Figure 7:
It is available to draw a conclusion from figure:
A. the temperature of certain point of stake week is all undergone by being first increased to the process for being basically unchanged and reducing to the end again, and temperature declines process
Curve ratio temperature ramp de curve is slightly gentle.
B. temperature duration curve all reaches peak value after a certain time and remains basicly stable for a period of time later, explanation
Concrete setting initial stage hydration heat rate constantly increases, and the heat that certain point of stake week absorbs is greater than the heat transmitted outward, temperature
Rise.Mid-term hydration heat rate slows down and is basically unchanged whithin a period of time, and stake week, certain point was in thermal equilibrium state.Later period water
Change rate of heat release is very slow, and heat that certain point of stake week absorbs is less than the heat transmitted outward, and temperature declines.
(2) temperature analysis duration
In order to verify in short-term duration, since each measuring point change of temperature field amount of hydration heat of concrete initiation is with the analysis period
Extension and gradually rise this changing rule, have chosen a diameter be R=0.1m bored concrete pile test data, take 6h, 7h, 8h,
Six piecewise analysis duration of 9h, 10h, 11h, image is as shown in Figure 8 after processing.
It is available to draw a conclusion from figure:
A. 9h is increased to by 6h with analysis duration, the temperature difference of concrete central point and room temperature increases to 1.9 DEG C by 1.1 DEG C, internal
Remaining point temperature is also in rising situation；
B. the thermal interaction coverage of concrete and pile peripheral earth is gradually expanded.Coverage is in 0.275m or so when 6h,
9h is at r=0.275m and room temperature still has about 0.9 DEG C of the temperature difference, according to curvilinear trend estimation heated effluent field in 0.45m or so.
The invention discloses one kind for cast-in-place concrete pile stake week thermo parameters method measurement experimental rig in laboratory and
Method, wherein cast-in-place concrete pile includes concrete pile, is simulated by the way that concrete to be poured into soil box by instrument true
Cast-in-place concrete pile pile under real engineering-environment, the circular in cross-section or ellipse (construction simulation of the concrete pile
Non-circular bored concrete pile caused by error), settable steel reinforcement cage；The all thermo parameters method measurement experimental rigs of stake pass through concrete temperature
Sensor and soil temperature sensor measure temperature, can get cast-in-place concrete pile stake week temperature field change with time with
The distribution in space is obtained laboratory ambient temperature variation by external temperature sensor, simulates the soil body by irrigation device
The case where different saturation, measures shadow of the water content of soil to analyze water content to thermo parameters method by tensiometer
It rings.The physical model of multiple groups cast-in-place concrete pile thermo parameters method is obtained by a series of experiments.The present invention utilizes heat-barrier material,
Influence of the laboratory ambient temperature variation to thermo parameters method model is improved significantly；Can a variety of soil property environment of arbitrarily simulate,
And size, label and setting steel reinforcement cage can be changed to concrete-pile, there is flexibility.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations
Also it should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of cast-in-place concrete pile stake week thermo parameters method measures experimental rig, characterized in that including heat insulation pedestal, soil box peace
In heat insulation pedestal, heat-insulated top plate is mounted on soil box, thermal insulation layer is wrapped up outside the soil box, the center of the soil box has mixed
Multiple concrete are arranged in solidifying soil bored concrete pile, filling soil between soil box and cast-in-place concrete pile, the cast-in-place concrete pile inside
Multiple soil temperature sensors, the concrete temperature sensor and the soil moisture is arranged in temperature sensor, the soil inside
Sensor will test data and be transferred to data logging computers, and the data logging computers are obtained by external temperature sensor
Environment temperature.
2. cast-in-place concrete pile stake week thermo parameters method according to claim 1 measures experimental rig, characterized in that described
Cast-in-place concrete pile includes no-reinforcing-bar cage concrete bored concrete pile, has steel reinforcement cage cast-in-place concrete pile；There is steel reinforcement cage coagulation when using
When native bored concrete pile, reinforcing bar temperature sensor is set, reinforcing bar temperature sensor will test data and be transferred to data record on steel reinforcement cage
Computer.
3. cast-in-place concrete pile stake week thermo parameters method according to claim 1 measures experimental rig, characterized in that described
Soil includes sand and/or clay.
4. cast-in-place concrete pile stake week thermo parameters method according to claim 1 measures experimental rig, characterized in that described
The packed height of soil and soil box are contour.
5. cast-in-place concrete pile stake week thermo parameters method according to claim 1 measures experimental rig, characterized in that described
Soil box is the cylinder-shaped acrylic chest of a face back cover one side not back cover.
6. cast-in-place concrete pile stake week thermo parameters method according to claim 1 measures experimental rig, characterized in that also wrap
Cyclic annular water pipe is included, cyclic annular water pipe is mounted on inside soil box, and cyclic annular water pipe connects external water source by two ports, at manufacture
In the soil of saturated mode.
7. a kind of cast-in-place concrete pile stake week thermo parameters method measurement method, characterized in that the following steps are included:
Experimental rig is assembled, including soil box is mounted in heat insulation pedestal, superscribes thermal insulation layer in soil box periphery, concrete is filled
Note device is fixed on soil box center, installs cyclic annular water pipe；
Filling soil, including prepared and banketed according to test requirements document selection, and adjust the water content banketed；
Cast-in-place concrete pile is made, including is determined whether that steel reinforcement cage is installed according to test requirements document, prepares satisfactory concrete,
Filling concrete device is taken out after injecting concrete into filling concrete device；
Mounting temperature sensor, including soil temperature sensor, concrete temperature sensor, reinforcing bar temperature are installed according to test requirements document
Spend sensor；
Heat-insulated top plate is mounted on soil box, each temperature sensor including external temperature sensor is connected to data note
Computer is recorded, data acquisition is started；
Change experimental condition, repeats the above steps；
Analyze test data.
8. cast-in-place concrete pile stake week thermo parameters method measurement method according to claim 7, characterized in that the filling
The method of soil includes: that will have determined that the uniform stirring that bankets of all kinds of Soil Parameters, and be uniformly layed in soil box when filling out composite soil
Between filling concrete device；When back-up sand soil, the sand of different compactness is prepared using the method for raining；When filling out clay, using precompressed
Concretion method prepares the clay of different overconsolidation ratios；The height of filling soil is equal with soil box.
9. cast-in-place concrete pile stake week thermo parameters method measurement method according to claim 7, characterized in that the adjustment
The method for the water content banketed is:
If the experimental design soil body is unsaturated state, first using the water content in tensiometer measurement soil box everywhere, and according to
The Soil Parameters known calculate soil body saturation degree, judge whether it is unsaturated state, then check whether water content distribution is uniform, if
Water content distribution has not yet been reached uniformly, and processing test is used again bankets until water content distribution reaches uniformly；
If the experimental design soil body is saturated mode, it is placed on two ports connection external water source of the cyclic annular water pipe in soil box, so that
The soil body is slowly filled with water to sand face or more, keeps head constant at this time, is saturated the soil body sufficiently and stands consolidation 24 hours or more.
10. cast-in-place concrete pile stake week thermo parameters method measurement method according to claim 7, characterized in that described mixed
Solidifying soil temperature sensor, reinforcing bar temperature sensor, the fitting depth of soil temperature sensor are equal and be respectively positioned on filling concrete
On a certain radius of stake.
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| CN111733787A (en) * | 2020-05-14 | 2020-10-02 | 中电建路桥集团有限公司 | Method and system for detecting karst cave treatment effect in bridge pile foundation construction process |
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