NL2023629B1 - Test device for shearing mechanical properties of interface between pile and soil - Google Patents
Test device for shearing mechanical properties of interface between pile and soil Download PDFInfo
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- NL2023629B1 NL2023629B1 NL2023629A NL2023629A NL2023629B1 NL 2023629 B1 NL2023629 B1 NL 2023629B1 NL 2023629 A NL2023629 A NL 2023629A NL 2023629 A NL2023629 A NL 2023629A NL 2023629 B1 NL2023629 B1 NL 2023629B1
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- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The present disclosure relates to the technical field of civil engineering, in particular to a test device for shearing mechanical properties of interface between pile 5 and soil, including a top plate, a support plate and a bottom plate, and a film box is embedded between the support plate and the bottom plate. The film box includes a rubber film cylinder, a bottom supporting board and a cover plate The bottom supporting board is coaxially embedded in the middle of the bottom plate, the bottom supporting board is disposed at the lower end of the rubber film cylinder. The cover 10 plate is used for sealing the upper port of the rubber film cylinder; and the vertical loading device is disposed in the middle portion of the top plate. The vertical loading device is used for applying vertical pressure to the pile. A set of tightening bands are evenly distributed around the outer periphery of the rubber film cylinder, and each tightening band is in arc shape and tangent to the outer circle of the rubber film 15 cylinder. The present disclosure can realize different experimental comparisons, by controlling the displacement stroke of each telescopic rod, when the strokes of the telescopic rods are the same, the same corresponding horizontal pressures are applied to the piles in the respective directions. When the strokes are the different, the different pressures to different sides are realized, which is flexible and adaptable to 20 different experimental requirements. Figure 1
Description
FIELD OF THE INVENTION The present disclosure relates to the technical field of civil engineering, in particular to a test device for shearing mechanical properties of interface between pile and soil.
BACKGROUND OF THE INVENTION As a main form of foundation, pile foundation is widely used in foundation engineering with the accumulation of practical engineering experience and theoretical research of pile foundation engineering. The calculation formula of the pile side friction resistance given in the existing pile foundation specification is mainly based on the empirical formula given the field test data. In many practical projects, the deviation of the measured side frictional resistance value is large. It is necessary to study the friction performance of pile-soil contact surface of different types of pile foundations in combination with model tests, and provide theoretical basis for pile foundation design in practical engineering.
In test devices of the prior art, the same pressure can only be applied around the pile, different pressures cannot be applied around the pile, and dynamic simulation cannot be performed, such that it is not suitable for different experimental requirements.
SUMMARY OF THE INVENTION In order to make up for the deficiencies of the prior art, the test device for shearing mechanical properties of interface between pile and soil provided by the present disclosure can test the mechanical properties of the pile foundation under different pressures on different sides of the pile.
The technical solution adopted by the present disclosure to solve the technical problems is as follows: A test device for shearing mechanical properties of interface between pile and soil provided by the present disclosure, including a top plate, a support plate and a bottom plate fixedly connected in series from top to bottom through a set of support columns, and a film box is embedded between the supportplate and the bottom plate, and the film box includes a rubber film cylinder, a bottom supporting board and a cover plate; the bottom supporting board is coaxially embedded in the middle of the bottom plate, the bottom supporting board is disposed at the lower end of the rubber film cylinder, the cover plate is used for sealing the upper port of the rubber film cylinder, the cover plate passes through the support plate and is fixedly connected to the top plate through a set of mounting column, and the vertical loading device is disposed in the middle portion of the top plate; the vertical loading device is used for applying vertical pressure to the pile; the bottom of the vertical loading device is provided with a vertical pressure sensor and a displacement sensor; inside the rubber film cylinder is provided with soil, and a set of horizontal pressure sensors are embedded in the sail; A set of tightening bands are evenly distributed around the outer periphery of the rubber film cylinder, and each tightening band is in arc shape and tangent to the outer circle of the rubber film cylinder; each end of the tightening bands is provided with a tightening device.
Preferably, the tightening device includes a rotating shaft, and the upper end of the rotating shaft is rotatably connected to the support plate, and the lower end of the rotating shaft is rotatably connected to the bottom plate, and the two ends of the tightening band are respectively fixedly coupled to the two rotating shafts.
Preferably, an upper end of each rotating shaft is fixedly provided with a gear, an arcuate sliding slot is provided is on the support plate, and an arcuate rack is slidably provided inside the arcuate sliding slot, and the arcuate rack meshes with the gear.
Preferably, two arcuate racks on the same tightening band are driven to synchronously slide away from each other by a synchronizing device.
Preferably, the synchronizing device includes a square guiding rod, the square guiding rod is provided between two opposite arcuate racks, and the square guiding rod is vertically slidably installed on the support plate; the bottom of the top plate is fixedly installed with a telescopic rod corresponding to the square guiding rod, a lower end of the telescopic rod is connected to the square guiding rod, opposite sides of the square guiding rod are each respectively hinged with a connecting rod, and a pushing plate is respectively hinged at the other end of each connecting rod, the pushing plate is slidably installed on the surface of the support plate; the other end of the arcuate rack is fixedly connected to a support spring.
Preferably, one end of each of the arcuate racks is fixedly installed with a fixing rod corresponding to the pushing plate, and a roller is rotatably installed in the middle of the fixing rod. The beneficial effects of the present disclosure are as follows: The present disclosure can realize the comparisons between different tests. By controlling the displacement stroke of each telescopic rod, when the strokes of the telescopic rods are the same, the corresponding horizontal pressures are applied to the piles in the respective directions, and different pressures applied to different sides are realized when the strokes are different, which is flexible and adaptable to different experimental requirements.
BRIEF DESCRIPTION OF THE DRAWINGS The present disclosure will now be further described with reference to the accompanying drawings. Figure 1 is a front view of the present disclosure; Figure 2 is a cross-sectional view taken along line A-A of Figure 1; Figure 3 is a schematic view showing the structure of the present disclosure after removing the vertical loading device; Figure 4 is a partial enlarged view of part E in Figure 3.
DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS In order to make the technical means, creative features, achievement goals and effects achieved by the present disclosure easy to understand, the present disclosure will be further described below in conjunction with specific embodiments. As shown in Figure 1 to Figure 4, the present disclosure is to provide a test device for shearing mechanical properties of interface between pile and soil, including a top plate 11, a support plate 12 and a bottom plate 13 fixedly connected in series from top to bottom through a set of support columns 15. A film box 3 is embedded between the support plate 12 and the bottom plate 13, and the film box 3 includes a rubber film cylinder 31, a bottom supporting board 32 and a cover plate 33. The bottom supporting board 32 is coaxially embedded in the middle of the bottom plate 13, the bottom supporting board 32 is disposed at the lower end of the rubber film cylinder 31 to block a lower port of the rubber film cylinder 31. The cover plate 33 is used for sealing the upper port of the rubber film cylinder 31, the cover plate 33 passes through the support plate 12 and is fixedly connected to the top plate 11 through a set ofmounting column 14. The rubber film cylinder 31 is disposed on the radially outer side of the pile column 22, and when the pile column 22 is inserted into the film box 3, a receiving cavity for accommodating the soil is provided between the rubber film cylinder 31 and the pile column 22. Soil is placed in the receiving cavity, and a set of horizontal pressure sensors are embedded in the soil.
A vertical loading device is disposed in the middle of the top plate 11 for applying vertical pressure to the pile column 22, and the vertical loading device includes a servo hydraulic machine 21 fixedly connected in the middle of the top plate
11. The lower end of the lower pressing rod of the servo hydraulic machine 21 penetrates the top plate 11 and is in contact with the top end of the pile column 22, and the lower pressing rod is provided with a displacement sensor 23 on the end surface contacting the pile column 22. The displacement sensor 23 is connected with the pressure sensor 24, and the pressure sensor 24 is embodied disposed between the displacement sensor 23 and the pile column 22. In the structure, the servo hydraulic machine 21 applies vertical pressure to the pile column 22 through the lower pressing rod. The displacement sensor 23 is used for detecting the displacement of the pile column 22, and the pressure sensor 24 is used for detecting the pressure applied by the servo hydraulic machine 21 to the pile column 22, which is conventionally test means in the prior art, and here is not be described in detail. A set of tightening bands 8 are evenly distributed on the outer periphery of the rubber film cylinder 31, each tightening band 8 has an arc shape and is tangent to the outer periphery of the rubber film cylinder 31. The tightening band 8 is provided with a tightening device 4 at each end, and since the tightening band 8 has elasticity, when the tightening device 4 pulls both ends of the tightening band 8, the middle portion of the curved tightening band 8 tends to be straightened, thereby applying a thrust to the rubber film cylinder 31.A horizontal pressure sensor is embedded in each of the tightening bands 8 in the pile soil for collecting the horizontal thrust applied in different directions.
As an embodiment of the present disclosure, the tightening device 4 includes a rotating shaft 41, and the upper end of the rotating shaft 41 is rotatably connected to the support plate 12, and the lower end of the rotating shaft 41 is rotatably connected to the bottom plate 13, and the two ends of the tightening band 8 are respectively fixedly coupled to the two rotating shafts 41. At each upper end of each rotating shaft 41 is fixedly provided with a gear 42, an arcuate sliding slot 121 is provided is on the support plate 12, and an arcuate rack 43 is slidably provided inside the arcuate sliding slot 121, and the arcuate rack 43 meshes with the gear 42. Thearcuate rack 43 slides and drives the rotating shaft 41 to rotate by the gear 42, so that the tightening band 8 is wound around the rotating shaft 41 by the rotation of the rotating shaft 41, so that the tightening band 8 is straightened.
As an embodiment of the present disclosure, two arcuate racks 43 on the 5 same tightening band 8 are driven to synchronously slide away from each other by a synchronizing device 5. The tightening band 8 is simultaneously pulled at both ends to avoid pressure deviation.
The synchronizing device 5 includes a square guiding rod 51, the square guiding rod 51 is provided between two opposite arcuate racks 43, and the square guiding rod 51 is vertically slidably installed on the support plate 12. The bottom of the top plate 11 is fixedly installed with a telescopic rod 52 corresponding to the square guiding rod 51, a lower end of the rod 52 is connected to the square guiding rod 51, a connecting rod 53 is respectively hinged on opposite sides of the square guiding rod 51, and a pushing plate 54 is respectively hinged at the other end of each connecting rod 53, the pushing plate 54 is slidably installed on the surface of the support plate 12, and the pushing plate 54 is used for pushing the arcuate rack to rotate.
The other end of the arcuate rack 43 is fixedly connected to a support spring 55, and the support spring 55 is located inside the arcuate sliding slot 121. One end of each of the arcuate racks 43 is fixedly installed with a fixing rod 6 corresponding to the pushing plate 54, and a roller 7 is rotatably installed in the middle of the fixing rod 6. The roller 7 is in contact with the surface of the pushing plate 54. When it is required to apply a horizontal thrust in a certain direction, the telescopic rod 52 in the direction protrudes for a stroke, the corresponding square guiding rod 51 moves downward, and the connecting rods 53 on both sides are rotated and the pushing rod pushes the arcuate rack 43 to slide, so that the tightening band 8 is wound around the rotating shaft 41 by the rotation of the rotating shaft 41, so that the tightening band 8 is straightened.
Correspondingly, in order to achieve different test comparisons, the point is that the displacement stroke of each telescopic rod 52 is controlled.
When the strokes are the same, the corresponding horizontal pressures applied to the pile column in the respective directions are the same, and different pressures applied to the different sides of the pile column are realized when the strokes are different, which is flexible.
The working principle of the present disclosure is as follows: The tester prefabricates the pile column 22, inserts the pile column 22 into the film box 3, and after the soil is loaded into the rubber film cylinder 31 and compacted, the cover plate 33 is sealed the upper port of the rubber film cylinder 31.
After the cover plate 33 is sealed, the top plate 11 is fixed on the upper end of the mounting column 14, and the servo hydraulic machine 21 is fixedly connected to the middle of the top plate 11, and the lower pressing rod is provided with a displacement sensor 23 on the end surface contacting the pile column 22. The pressure sensor 24 is disposed between the displacement sensor 23 and the pile column 22.
When simulating the same side pressure on the outer periphery of the pile column 22, the square guiding rod 51 is pushed to move the same stroke by controlling each of the telescopic rods 52. As the square guiding rod 51 moves downward, the connecting rods 53 on both sides thereof are rotated, such that the pushing rod pushes the arcuate rack 43 to slide. Thereby, by rotating the rotating shaft 41, the tightening band 8 is wound on the rotating shaft 41, so that the tightening band 8 is straightened, and the same horizontal pressure is applied to the pile column 22 in different directions.
When simulating different lateral pressures on the outer periphery of the pile column 22, the square guiding rods 51 are driven to rotate different strokes by controlling each of the telescopic rods 52, and correspondingly, the rotating shafts 41 have different rotation ranges, and the corresponding tightening bands 8 have different degrees of straightness. Therefore, different horizontal side pressures are applied to pile column 22 in different directions.
Finally, the servo hydraulic machine 21 is started to apply vertical pressure to the pile column 22, and under the vertical pressure, the pile column 22 moves in the vertical direction, and the pressure and displacement of the pile column 22 are obtained by the pressure sensor 24 and the displacement sensor 23, respectively. And the shear force of the pile-soil contact surface is calculated according to the calculation method of the prior art.
While the present disclosure has been described by way of specific embodiments, it should be understood by the ordinary skilled person in the art that various modifications and equivalent replacement may be made to the present disclosure without departing from the scope of the present disclosure. In addition, various modifications can be made to the present disclosure according to specific situation or materials, which is not out of the scope of the present disclosure. Therefore, the present disclosure is not limited to the specific embodiments disclosed, but all the embodiments falling within the scope of the appended claims.
1. A test device for shearing mechanical properties of interface between pile and soil, comprising a top plate (11), a support plate (12) and a bottom plate (13) fixedly connected in series from top to bottom through a set of support columns (15), wherein, afilm box (3) is embedded between the support plate (12) and the bottom plate (13), and the film box (3) comprises a rubber film cylinder (31), a bottom supporting board (32) and a cover plate (33); the bottom supporting board (32) is coaxially embedded in the middle of the bottom plate (13), the bottom supporting board (32) is disposed at the lower end of the rubber film cylinder (31), the cover plate (33) is used for sealing the upper port of the rubber film cylinder (31), the cover plate (33) passes through the support plate (12) and is fixedly connected to the top plate (11) through a set of mounting column (14); and the vertical loading device is disposed in the middle portion of the top plate (11); the vertical loading device is used for applying vertical pressure to the pile; the bottom of the vertical loading device is provided with a vertical pressure sensor and a displacement sensor; inside the rubber film cylinder (31) is provided with soil , and a set of horizontal pressure sensors are embedded in the soil; wherein a set of tightening bands (8) are evenly distributed around the outer periphery of the rubber film cylinder (31), and each tightening band (8) is in arc shape and tangent to the outer circle of the rubber film cylinder (31); each end of the tightening bands (8) is provided with a tightening device (4).
2. The test device for shearing mechanical properties of interface between pile and soil according to embodiment 1, wherein the tightening device (4) comprises a rotating shaft (41), and the upper end of the rotating shaft (41) is rotatably connected to the support plate (12), and the lower end of the rotating shaft (41) is rotatably connected to the bottom plate (13), and the two ends of the tightening band (8) are respectively fixedly coupled to the two rotating shafts (41).
3. The test device for shearing mechanical properties of interface between pile and soil according to embodiment 2, wherein an upper end of each rotating shaft (41) is fixedly provided with a gear (42), an arcuate sliding slot (121) is provided is on the support plate (12), and an arcuate rack (43) is slidably provided inside the arcuate sliding slot (121), and the arcuate rack (43) meshes with the gear (42).
4. The test device for shearing mechanical properties of interface between pile and soil according to embodiment 3, wherein two arcuate racks (43) on the same tightening band (8) are driven to synchronously slide away from each other by a synchronizing device (5).
5. The test device for shearing mechanical properties of interface between pile and soil according to embodiment 4, wherein the synchronizing device (5) comprises a square guiding rod (51), the square guiding rod (51) is provided between two opposite arcuate racks (43), and the square guiding rod (51) is vertically slidably installed on the support plate (12); the bottom of the top plate (11) is fixedly installed with a telescopic rod (52) corresponding to the square guiding rod (51), a lower end of the telescopic rod (52) is connected to the square guiding rod (51), opposite sides of the square guiding rod (51) are each respectively hinged with a connecting rod (53), and a pushing plate (54) is respectively hinged at the other end of each connecting rod (53), the pushing plate (54) is slidably installed on the surface of the support plate (12); the other end of the arcuate rack (43) is fixedly connected to a support spring (55).
6. The test device for shearing mechanical properties of interface between pile and soil according to embodiment 5, wherein one end of each of the arcuate racks (43) is fixedly installed with a fixing rod (6) corresponding to the pushing plate (54), and a roller (7) is rotatably installed in the middle of the fixing rod (6).
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL2023629A NL2023629B1 (en) | 2019-08-11 | 2019-08-11 | Test device for shearing mechanical properties of interface between pile and soil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL2023629A NL2023629B1 (en) | 2019-08-11 | 2019-08-11 | Test device for shearing mechanical properties of interface between pile and soil |
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| Publication Number | Publication Date |
|---|---|
| NL2023629A NL2023629A (en) | 2019-09-25 |
| NL2023629B1 true NL2023629B1 (en) | 2020-08-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| NL2023629A NL2023629B1 (en) | 2019-08-11 | 2019-08-11 | Test device for shearing mechanical properties of interface between pile and soil |
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| NL (1) | NL2023629B1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111157364A (en) * | 2020-01-19 | 2020-05-15 | 檀俊坤 | Pile-soil contact surface shearing mechanical property testing device |
| CN116519486B (en) * | 2023-05-29 | 2024-03-08 | 广州建筑股份有限公司 | Negative excess pore water pressure model test device and method for following tubular pile drilling while drilling |
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