CN111257215A - Pile body freeze-drawing force testing device - Google Patents
Pile body freeze-drawing force testing device Download PDFInfo
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- CN111257215A CN111257215A CN202010097769.5A CN202010097769A CN111257215A CN 111257215 A CN111257215 A CN 111257215A CN 202010097769 A CN202010097769 A CN 202010097769A CN 111257215 A CN111257215 A CN 111257215A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
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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
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
Abstract
The invention discloses a pile body freeze-drawing force testing device which comprises a model box, a water tank, a cold bath box, a heat insulation box, a sensor reserved hole, a water permeable partition plate, a water replenishing bottle, a dynamometer, a test pile and a data collector, wherein scales are marked on the inner side of the model box, the sensor hole is reserved on the side surface of the model box, the water permeable partition plate is fixedly installed in the model box, the water tank is arranged at the bottom in the model box, the dynamometer is installed on a dynamometer connecting base, the test pile is fixedly installed on the dynamometer, a hydrothermal sensor is installed in the sensor reserved hole, the cold bath box is fixedly installed at the bottom of the model box, the water replenishing bottle is communicated to the water tank through a pipeline, and the dynamometer and the hydrothermal sensor are respectively and externally connected. The test device is simple to manufacture, has a clear principle, and is more reliable and accurate in result by using the dynamometer to measure the freeze-pull force principle of the pile body compared with the traditional strain gauge.
Description
The technical field is as follows:
the invention belongs to the field of indoor model testing of frozen soil mechanics, and particularly relates to a pile body frozen-pulling force testing device.
Background art:
the freeze-drawing mainly takes place in the column basis or the structure that buries depth, the quality is light of cold district, like wire pole, solar panel's among the photovoltaic power generation shallow thin pile foundation etc. but to burying deeply, in the heavy pile foundation of quality, also can have the freeze-drawing power to destroy the overall structure nature of pile foundation as the additional force, bring latent risk for the engineering.
In a structure in a cold region, a pile foundation is in direct contact with a soil body, when the temperature reaches negative temperature, the soil body on the upper part of the periphery of the pile reaches freezing temperature first, the pile begins to freeze, the volume is expanded, under the action of negative temperature gradient, unfrozen water on the lower part of the soil body can migrate and accumulate to a freezing frontal surface through pores in the soil body, the pile foundation loses stability due to continuous increase of the frost-pulling force during continuous migration of unfrozen water, and phenomena such as uplifting, inclination and even breakage of a pile body occur, for example, a wire pole in a Qinghai region and a northeast permafrost region is uplifted, a support of a photovoltaic power generation solar panel in a high-latitude high-altitude region is uplifted, and phenomena such as uplifting of the pile foundation of a small bridge and a bearing platform foundation of a lakeshore structure are all caused by. The pile body or the rod body is the main freezing injury problem faced by projects such as electric power, roads and energy sources in cold regions, the mechanism of the freezing and pulling force action and the size of the freezing and pulling force are fully known in the design of the pile foundation in the cold regions, and the premise of the work is to accurately measure the freezing and pulling force of the pile body in the projects and tests, so that the accurate measurement of the freezing and pulling force in the projects and the tests is an important index for realizing the freezing and pulling prevention and control, and is an important basis for guiding the design and calculation of the freezing and pulling measures.
In the freeze-drawing force indoor model test of the pile body, a strain gauge method, a reaction beam method and a drawing method are commonly used.
The strain gauge method is characterized in that strain gauges are adhered to a pile body, and tangential frost heaving force borne by the pile body is obtained through stress values corresponding to two adjacent strain gauges of the pile body, but the test method has the following defects: the strain gauge is greatly influenced by temperature, and the temperature compensation effect needs to be considered; the strain gauge can only measure the strain of a single point, and cannot carry out global measurement, so that a large error exists when the strain gauge is converted into the freeze-drawing force borne by the whole pile body; in addition, the testing method for pasting the strain gauge on the pile body is limited by the shape of the pile body, and the strain gauge cannot be pasted on special-shaped piles such as spiral piles, bamboo-joint piles and the like.
The counter-force beam method is that a dynamometer is arranged at the top of a tested pile body, a cross beam is placed at the top of the tested pile body to serve as a counter-force frame, and the frozen pulling force at the top of the pile body in the frozen swelling process is tested through the dynamometer on the counter-force frame. This test method has the following disadvantages: if the counterforce beam support is arranged in the model box, the contact with the soil body in the test can also generate the freezing and pulling effect, and the measured freezing and pulling force cannot be accurately explained as the freezing and pulling force of the pile body; if the counterforce beam is arranged on the outer side of the model box, the vertical height of the test model can be increased, and more space is occupied; in addition, if the pile body inclines under the action of the frozen-pulling force, the frozen-pulling force tested at the top of the pile body is not the vertical frozen-pulling force actually borne by the pile body.
The drawing method is a method for pulling out or pressing in a pile body in frozen soil at negative temperature to test the force required when the pile body is separated from the frozen soil, and has the following defects: the pile body in the frozen soil is pulled out or pressed in, the damaged cementing force of the ice soil interface is not the freezing pulling force in a strict sense; the freeze-drawing force is a quantity which changes continuously along with time, and is also influenced by factors such as water content, temperature and the like, the integrity of the pile soil is damaged by adopting a drawing method, the change condition of the freeze-drawing force in the water replenishing and temperature changing processes cannot be tested, and only a single shearing force limit value of a pile soil contact surface can be obtained in one test.
Therefore, it is particularly necessary to develop a freezing and pulling force testing device and a testing method which have reliable testing principles, can adapt to various pile types, meet water replenishing and temperature control conditions in the testing process, can simulate actual working conditions and can detect the change rule of the freezing and pulling force in real time.
The invention content is as follows:
the technical problem to be solved by the invention is as follows: aiming at the defects of unreliable testing principle of the prior art, inaccurate testing of the freezing-pulling force of the prior art and the like, the pile freezing-pulling force testing device and the testing method are provided, the testing principle is reliable, the pile freezing-pulling force testing device can adapt to various pile types, the water supplementing and temperature controlling conditions are met in the testing process, the actual working condition can be simulated, and the change rule of the freezing-pulling force can be monitored in real time.
In order to solve the technical problems, the invention is realized by the following technical scheme: a pile body freeze-drawing force testing device comprises a mold box, a water tank, a cold bath box, a heat insulation box, a sensor preformed hole, a water permeable partition, a water replenishing bottle, a dynamometer, a test pile and a data collector, wherein the inner side of the mold box is marked with scales, the sensor hole is preformed in the side surface of the mold box, the water permeable partition is fixedly installed inside the mold box, the water tank is arranged at the bottom in the mold box and is positioned at the upper part of the water tank, the heat insulation box is arranged outside the mold box in a covering mode, meshes are formed in the water permeable partition, a dynamometer connecting base is welded on the water permeable partition, the dynamometer is installed on the dynamometer connecting base, the test pile is fixedly installed on the dynamometer, a hydrothermal sensor is installed in the sensor preformed hole, the cold bath box is fixedly installed at the bottom of the mold box, and the water, the dynamometer and the hydrothermal sensor are respectively externally connected to the data acquisition unit through leads.
Preferably, the water replenishing bottle is a Mariotte bottle, and scales are marked on the water replenishing bottle.
Preferably, the dynamometer and the dynamometer connecting base are fixedly installed in a threaded connection mode.
Preferably, the dynamometer is sleeved with a pile casing, and the lower part of the pile casing is fixedly welded on the water-permeable partition plate.
Preferably, filter paper is laid on the upper part of the water-permeable partition.
The water-permeable partition plate comprises an upper partition plate, a lower partition plate and bolts, the water-permeable holes are correspondingly formed in the upper partition plate and the lower partition plate, waist-shaped holes are formed in the upper partition plate, threaded holes are formed in the lower partition plate, the bolts are installed in the waist-shaped holes and the threaded holes, and the upper partition plate and the lower partition plate are fixedly connected through the bolts.
Preferably, the inner side wall of the mold box 1 is provided with scales.
Compared with the prior art, the invention has the advantages that:
1. the test device is simple to manufacture, has a clear principle, and is more reliable and accurate in result by using the dynamometer to measure the freeze-pull force principle of the pile body compared with the traditional strain gauge. Compared with the method for testing the freeze-drawing force by the counter-force frame, the method has the advantages that the dynamometer is installed inside the model box and at the bottom of the pile body, so that the volume of the horizontal and vertical space occupied by the model box is reduced;
2. one end of the dynamometer is fixed at a dynamometer connecting seat on the waterproof bottom plate, the other end of the dynamometer is directly connected with the pile bottom, the freezing-pulling force of the pile body is the pulling force borne by the dynamometer, and the dynamometer is externally connected with a data collector, so that the change rule of the freezing-pulling force of the pile body and the maximum total freezing-pulling force in the freezing process under various conditions can be tested, and the dissipation rule of the freezing-pulling force in the arbitrary melting process can also be tested;
3. the outer side of the model box is wrapped by a heat insulation box, the heat insulation box on the outer side prevents heat transfer, the cold bath box at the bottom can be disassembled, the temperature of water in the water tank at the bottom of the model box can be controlled after the cold bath box is installed, and when the cold bath box is disassembled, the water in the water tank can be kept at a constant temperature under the action of five-surface heat insulation;
4. the water tank at the bottom of the model box is separated from the soil body by using the water permeable partition plate, the filter paper is laid on the water permeable partition plate to prevent the soil body from falling, the size of the meshes of the water permeable partition plate can be regulated, the water replenishing speed can be regulated by changing the size of the meshes, any water replenishing condition can be realized on the whole bottom area of the soil body during test, the process of underground water migration at a certain underground plane in different projects can be widely simulated, compared with the single-point water replenishing test condition, the actual water replenishing working condition is better met, and the obtained water distribution rule has more guiding value on the entity project;
5. after being wrapped by the heat insulation box, the bottom surface and five sides around the whole device are heat-insulated, the device can be directly placed in a simple refrigerator to meet the one-way freezing or melting condition without other temperature control devices or cold baths, the environmental temperature in the refrigerator is adjusted in advance during the test, then the refrigerator is cooled to cool the soil on the surface of the model box, the ground surface cooling process can be simulated, the temperature change process in the test is close to the actual temperature change working condition, and the obtained temperature change rule has guiding significance for the engineering practice;
6. the side surface of the water tank is connected with a water replenishing bottle, the water replenishing bottle is a Mariotte bottle and is marked with scales, and the water replenishing amount can be monitored in real time through the scale change of the liquid level of the water replenishing bottle in the freezing process;
7. sensor holes are reserved in the side face of the model box, and in the process of the pile body freeze-drawing force test, other sensors such as moisture, temperature and the like are buried through the sensor holes, so that other parameter change processes of a soil body can be monitored at the same time;
8. in the device, the pile body and the dynamometer are fixedly connected on a dynamometer connecting seat at the position of the water-permeable partition plate, so that the pile body has no displacement, and the soil body around the pile can be frozen and expanded freely, thereby directly observing the frozen and expanded displacement change of the top surface of the soil body through the scale marked on the inner side of the model box;
9. the device can respectively carry out the frozen-pulling force test and the frozen-pulling displacement test (without a dynamometer) on two pile bodies with the same size, thereby establishing the relation between the frozen-pulling force and the frozen-pulling quantity and guiding the research and development of the frozen-pulling measures;
10. the device can be connected with a plurality of dynamometer bases at the positions of the water-permeable partition plates, and can simultaneously carry out the comparison test of the freezing and pulling forces of pile bodies with various sizes under the same soil body and the same hydrothermal condition by mounting a plurality of dynamometers on the dynamometer bases;
11. the testing device can adapt to model piles in various shapes, the testing piles can be set into various special-shaped piles such as cylindrical piles, tapered piles, spiral piles or bamboo joint piles and the like according to testing conditions, if the testing piles are concrete piles, the provided idea is that embedded bolts are connected with a dynamometer, and if the testing piles are piles made of other materials, the testing piles can be flexibly changed and applied by referring to the connection mode of the concrete piles according to the characteristics of the materials;
12. the method for testing the freezing-pulling force by adopting the dynamometer can also be directly applied to in-situ freezing-pulling force monitoring of the actual engineering pile body (in the actual engineering, the lowest part of the pile body is buried below a freezing depth line).
13. The dynamometer outside is protected by a pile casing, prevents dynamometer and soil body direct contact, and can avoid experimental stake bottom and soil body contact, guarantees that the data of dynamometer test are the power of pulling out of freezing of stake side soil body.
Description of the drawings:
the invention is further described below with reference to the accompanying drawings.
Fig. 1 is a schematic perspective view of the present invention.
Fig. 2 is a schematic cross-sectional structure of the present invention.
FIG. 3 is a diagram showing the variation law of the freezing force during the freezing process.
FIG. 4 is a graph showing the change of freezing and pulling force during melting at-30 ℃.
Fig. 5 is a schematic view of the structure of the water-permeable partition.
The specific implementation mode is as follows:
the present invention will be described in detail with reference to specific embodiments below:
as shown in figures 1 and 2, the pile body freeze-drawing force testing device comprises a model box 1, a water tank 2, a cold bath box 3, a heat insulation box 4, a sensor reserved hole 5, a water permeable partition plate 6, a water replenishing bottle 7, a dynamometer 8, a test pile 9 and a data collector 11, wherein the model box 1 is made by welding steel plates, scales are marked on the inner side of the model box 1, the sensor hole 5 is reserved on the side surface, the water permeable partition plate 6 is fixedly installed inside the model box 1, scales are arranged on the inner side wall of the model box 1, the frost heaving displacement change of the top surface of a soil body can be directly observed through the scales marked on the inner side of the model box 1 in the testing process, the water tank 2 is arranged at the bottom inside the model box 1, the water permeable partition plate 6 is positioned at the upper part of the water tank 2, the water replenishing bottle 7 is installed on the side surface of the water tank 2, the heat insulation box 4 is coated and, due to the heat insulation effect of the heat insulation box 4, the device is directly placed into a common refrigerator to be frozen or melted, so that the unidirectional freezing and unidirectional melting processes can be realized without other temperature control devices; meanwhile, as the heat insulation box is detachable, the whole experimental device of the steel mold box, the test soil body and the pile body can be pre-loaded in the heat insulation box for freezing and melting tests at any initial temperature field, the water permeable partition 6 is provided with meshes, the water permeable partition 6 comprises an upper partition 61, a lower partition 62 and bolts 63, the upper partition 61 and the lower partition 62 are correspondingly provided with water permeable holes, the upper partition 61 is provided with waist-shaped holes, the lower partition 62 is provided with threaded holes, the bolts 63 are installed in the waist-shaped holes and the threaded holes, the bolts 63 connect and fix the upper partition 61 and the lower partition 62, the mesh size of the water permeable partition 6 can be adjusted, different water replenishing rates can be controlled by adjusting the mesh size, the water permeable partition is a double-layer partition, the bolts 63 are installed on two sides of the lower partition 62, and the waist-shaped holes are arranged on two sides of the upper partition 61 to serve as, the area of the lower partition plate 62 is smaller than that of the upper partition plate 61, and the bolts of the lower partition plate 63 can slide in the sliding grooves of the upper partition plate 61, so that the upper and lower partition plates are fixed by the bolts 63. The bolt 63 is unscrewed, the relative dislocation of the upper and lower partition plates changes the size of the water permeable holes, when the meshes of the upper and lower partition plates coincide, the contact area of the sample and water is the largest, and the water replenishing rate is the largest. During testing, the densely distributed meshes can uniformly replenish water to the whole bottom area of a soil body at multiple points, the water replenishing is closer to the actual working condition than single-point water replenishing, a plurality of dynamometer connecting bases 12 are welded at different positions on the water-permeable partition plate 6, the dynamometers 8 are connected through the bases 12, meanwhile, pile bodies of various sizes are subjected to freezing-pulling force comparison testing under the same soil body and the same hydrothermal condition, the dynamometer 8 is installed on the dynamometer connecting base 12, the test pile 9 is fixedly installed on the dynamometer 8, the dynamometer 8 is fixed on the base 12 and is directly connected with the pile bottom of the test pile 9, a protective cylinder 13 is sleeved on the dynamometer 8, the lower part of the protective cylinder 13 is fixedly installed on the water-permeable partition plate 6 in a welding mode, the protective cylinder 13 plays a role in protecting the dynamometer 8, the tester 8 and the soil body filling are kept isolated, and the data tested by the dynamometer 8 are the freezing-pulling force of the soil body on, the freeze-drawing force of the pile body is the pulling force borne by the dynamometer, the change rule of the freeze-drawing force of the pile body in the freezing process, the maximum total freeze-drawing force and the dissipation rule of the freeze-drawing force in the melting process under various conditions can be directly measured, a hydrothermal sensor 10 is installed in a sensor preformed hole 5, the hydrothermal sensor 10 monitors the change of temperature and moisture in the soil body in the freezing process, a cold bath box 3 is installed at the bottom of a model box 1, the cold bath box 3 below the model box 1 can be disassembled, when the cold bath box 3 is disassembled, a heat insulation box 4 wrapped outside the model box 1 enables the temperature of water in a water tank 2 to be kept constant, the cold bath box 3 can be subjected to temperature control through a program, a water replenishing bottle 7 is communicated to the water tank 2 through a pipeline, the water replenishing amount can be observed in real time through the change of the liquid level of the water replenishing bottle 7 in the freezing process, and the, the water replenishing bottle 7 is a Mariotte bottle, scales are marked on the water replenishing bottle 7, the dynamometer 8 and the dynamometer connecting base 12 are fixedly installed in a threaded connection mode, and in the test process, filter paper is laid on the upper portion of the water permeable partition plate 6, so that the soil body can be prevented from falling.
The test pile 9 can be a cylindrical pile, a conical pile, a spiral pile, a bamboo joint pile and the like made of different materials, if the pile is a concrete cylindrical pile or a conical pile, the invention provides an implementation method for connecting an embedded bolt with a dynamometer, if the pile is an iron pile or a steel pile, the invention provides an implementation method for connecting a welding bolt at the bottom of the pile with the dynamometer, and if the pile is a pile made of other materials, a reasonable connection mode is selected according to the characteristics of the materials. As a preferred embodiment, the device selects a steel box body with the size of 60cm in length, the width of 40cm and the height of 50cm, the thickness of the heat insulation box is 5cm, the device wraps the model box, the test pile body is a concrete conical pile, the diameter of the top of the concrete conical pile is 4cm, the diameter of the bottom of the concrete conical pile is 6cm, the height of the concrete conical pile is 25cm, and bolts are embedded in the concrete conical pile.
In the test process, the outer surface of the model box 1 is wrapped by the heat insulation box 4 to prevent heat transfer around the model box 1 and on the bottom surface of the model box 1, the cold bath box 3 at the lower part of the water tank 2 is installed or disassembled according to whether the water temperature needs to be regulated, when the device is integrally placed in a low-temperature control room or a common refrigeration refrigerator, the test can meet the conditions of unidirectional freezing and unidirectional melting, meanwhile, the heat insulation box 4 can be disassembled, and the whole experimental device of the steel model box 1, the test soil body and the pile body can be reloaded into the heat insulation box in advance to realize any initial temperature field to perform unidirectional freezing and melting tests.
A sensor hole is reserved on the outer side of a model box 1, a hydrothermal sensor 10 can be buried in a reserved sensor hole 5 according to test requirements, the hydrothermal sensor 10 can simultaneously measure the moisture temperature change condition of soil around a pile in the freezing process, a comparison pile can also be buried in the model box 1 in the test, the comparison pile and the test pile are arranged at different positions in the same horizontal height in the model box, the comparison pile is not connected with a dynamometer, a displacement sensor is arranged above the comparison pile, the freezing and pulling displacement data of the comparison pile can also be collected, and therefore the relation between freezing and pulling force and freezing and pulling displacement is established. In addition, the bottom plate can be simultaneously connected with a plurality of pile bodies with the same size, and the change rule of the freezing and pulling force of the pile bodies with different sizes can be tested under the same soil body and the same hydrothermal condition.
Before the test, water is injected into the water tank 2 until the water just submerges the water-permeable partition 6, the filter paper is laid on the bottom plate of the water-permeable partition 6, the bottom of the test pile is connected with the dynamometer, the configured soil is uniformly filled and compacted in a layered mode around the pile, and sensors of water, temperature and the like are buried in the appropriate position of the soil around the pile in the period. And after the soil body is filled, filling water into the water replenishing bottle, and recording the initial scale. Then the switch of the refrigerator is turned on, the temperature is adjusted to the set negative temperature, the surface of the soil body is a cold end in the cooling process of the refrigerator, if the temperature of the water in the bottom layer water tank 2 in the model box 1 needs to be adjusted, the cold bath box 3 needs to be installed, the water tank 2 supplies water to the sample, and the sample is frozen in a one-way mode. In the test process, the whole process of the change of the frozen pulling force in the freezing and melting processes is recorded by an external data collector, the hydrothermal change condition in the soil body is observed by the arranged moisture temperature sensor, and in addition, the frost heaving amount of the top surface of the soil body can also be observed by the scale marks on the inner side of the model box. FIG. 3 is a diagram showing the variation law of the frozen-out force during the freezing process, and FIG. 4 is the data of the frozen-out force test of the concrete test pile at-30 ℃.
The first embodiment is as follows:
1. and manufacturing a test pile, and configuring a soil sample with initial water content.
2. And (3) connecting the dynamometer 8 to a base 12 on the water-permeable partition plate 6 in the model box 1, connecting and fixing the test pile 9 and the dynamometer 8, and externally connecting a lead to a data acquisition unit 11.
3. A hydrothermal sensor 10 penetrates into the model box 1 through a sensor preformed hole 5 in the side face of the model box 1, and the hydrothermal sensor 10 is a temperature sensor and a moisture sensor and can measure temperature and moisture data.
4. Injecting water into a water tank 2 in the model 1, stopping injecting water when water just exceeds a water-permeable partition plate 6, laying a layer of filter paper above a water-proof bottom plate 6, then loading soil samples into the model box 1 in a layered mode, embedding a water heat sensor in soil around the pile at a certain interval in the soil loading process, and compacting the soil in a layered mode.
5. After the soil is filled, the model box 1, the test soil and the whole experimental device of the test pile 9 are placed in a preset temperature field to realize an initial temperature condition, then the whole device is wrapped by the heat insulation box 4 (if the water temperature of the water tank 2 needs to be controlled, the cold bath box 3 is installed at the bottom of the steel model box 1, if the water temperature does not need to be controlled, the cold bath box 3 does not need to be installed), the whole device wrapping the heat insulation box is placed in a refrigeration refrigerator, the temperature of the refrigerator is adjusted to a set negative temperature before the test, the temperature in the refrigerator is a cold end, the heat insulation box 4 prevents heat transfer around and at the bottom of the heat insulation box 1, a unidirectional freezing condition is realized, and the sample starts to be frozen.
6. The initial height of soil filling is recorded according to the scales of the inside scales of the model box 1, the dynamometer 8 and the hydrothermal sensor 10 are electrified, the change rule of the frozen-out force, the change conditions of temperature and water at different positions and the frost heaving amount of the surface of the soil are recorded in the freezing process, and in addition, the water replenishing quantity can be monitored through the change of the scales of the liquid level of the Mariotte water replenishing bottle 7.
It is to be emphasized that: it will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (7)
1. The utility model provides a pile body power testing arrangement that freezes pulls out which characterized in that: comprises a model box (1), a water tank (2), a cold bath box (3), a heat insulation box (4), a sensor preformed hole (5), a water permeable partition plate (6), a water replenishing bottle (7), a dynamometer (8), a test pile (9) and a data acquisition unit (11), wherein the inner side of the model box (1) is marked with scales and the side surface is preformed with the sensor hole (5), the water permeable partition plate (6) is fixedly arranged inside the model box (1), the water tank (2) is arranged at the inner bottom of the model box (1), the water permeable partition plate (6) is positioned at the upper part of the water tank (2), the heat insulation box (4) is coated outside the model box (1), meshes are arranged on the water permeable partition plate (6), a dynamometer connecting base (12) is welded on the water permeable partition plate (6), the dynamometer (8) is arranged on the dynamometer connecting base (12), the test pile (9) is fixedly arranged on the dynamometer (8), the water heating device is characterized in that a water heating sensor (10) is installed in the sensor preformed hole (5), the cold bath box (3) is installed at the bottom of the model box (1), the water replenishing bottle (7) is communicated to the water tank (2) through a pipeline, and the dynamometer (8) and the water heating sensor (10) are externally connected to the data collector (11) through leads respectively.
2. The pile body freeze-drawing force testing device according to claim 1, characterized in that: the water replenishing bottle (7) is a Mariotte bottle, and scales are marked on the water replenishing bottle (7).
3. The pile body freeze-drawing force testing device according to claim 1, characterized in that: the dynamometer (8) and the dynamometer connecting base (12) are fixedly installed in a threaded connection mode.
4. The pile body freeze-drawing force testing device according to claim 1, characterized in that: and filter paper is laid on the upper part of the water permeable partition (6).
5. The pile body freeze-drawing force testing device according to claim 1, characterized in that: the water permeable partition board (6) comprises an upper partition board (61), a lower partition board (62) and bolts (63), water permeable holes are correspondingly formed in the upper partition board (61) and the lower partition board (62), waist-shaped holes are formed in the upper partition board (61), threaded holes are formed in the lower partition board (62), the bolts (63) are installed in the waist-shaped holes and the threaded holes, and the bolts (63) connect and fix the upper partition board (61) and the lower partition board (62).
6. The pile body freeze-drawing force testing device according to claim 1, characterized in that: a pile casing (13) is sleeved on the dynamometer (8), and the lower part of the pile casing (13) is fixedly welded on the water-permeable partition plate (6).
7. The pile body freeze-drawing force testing device according to claim 1, characterized in that: scales are arranged on the inner side wall of the model box (1).
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| CN202010097769.5A CN111257215A (en) | 2020-02-17 | 2020-02-17 | Pile body freeze-drawing force testing device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112325944A (en) * | 2020-11-10 | 2021-02-05 | 李卫东 | Engineering pile construction monitoring device based on BIM and monitoring method thereof |
| CN114755092A (en) * | 2022-03-23 | 2022-07-15 | 哈尔滨商业大学 | Special device and method for seasonal frozen soil indoor test |
-
2020
- 2020-02-17 CN CN202010097769.5A patent/CN111257215A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112325944A (en) * | 2020-11-10 | 2021-02-05 | 李卫东 | Engineering pile construction monitoring device based on BIM and monitoring method thereof |
| CN114755092A (en) * | 2022-03-23 | 2022-07-15 | 哈尔滨商业大学 | Special device and method for seasonal frozen soil indoor test |
| CN114755092B (en) * | 2022-03-23 | 2023-02-03 | 哈尔滨商业大学 | Special device and method for seasonal frozen soil indoor test |
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