CN210684813U - Tubular pile-cement soil contact surface sample preparation device and friction characteristic research device thereof - Google Patents
Tubular pile-cement soil contact surface sample preparation device and friction characteristic research device thereof Download PDFInfo
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- CN210684813U CN210684813U CN201921010591.5U CN201921010591U CN210684813U CN 210684813 U CN210684813 U CN 210684813U CN 201921010591 U CN201921010591 U CN 201921010591U CN 210684813 U CN210684813 U CN 210684813U
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Abstract
The utility model discloses a tubular pile-soil cement contact surface system appearance device and friction characteristic research device thereof. The sample preparation device for the tubular pile-cement soil contact surface comprises a tubular pile die and a contact surface sample preparation die and is used for preparing a model tubular pile-cement soil contact surface sample. The shear test device for researching the friction characteristic of the tubular pile-cement soil contact surface comprises a circular model box, a model tubular pile-cement soil contact surface sample, a counter-force beam and a loading motor. A model tubular pile-cement soil contact surface sample is placed at the center of the circular model box, sand is filled in the model box, and a soil pressure sensor is placed in the sand; the model tubular pile is loaded through the motor, and the load and displacement applied by the motor in the loading process can be automatically acquired. The utility model discloses it is rational in infrastructure, easy operation can carry out the system appearance of tubular pile-cement soil contact surface, still can provide an effective means for the research of tubular pile-cement soil contact surface frictional behavior.
Description
Technical Field
The utility model belongs to the geotechnical engineering field, concretely relates to tubular pile-cement soil contact surface system appearance device and friction characteristics research device thereof can be used to the tubular pile-cement soil contact surface friction characteristics of research cement soil intensity asynchronism.
Background
Pile foundations are an important foundation form and are widely applied to high-rise buildings, expressways and some major foundation setting projects. At present, the most widely applied pile foundations are mainly prestressed pipe piles and cast-in-place bored piles, but both pile foundations have some problems in practical engineering application. A large number of deep and thick soft clay layers are distributed in the coastal areas of southeast China, the soil engineering property is poor, and the bearing performance of the traditional prestressed pipe pile and the traditional cast-in-situ bored pile in the areas is poor. With the accumulation of practical engineering experience of pile foundations and the deepening of theoretical research, novel pile foundations such as a squeezed branch pile, a spiral pile, a stiff core mixing pile, a pipe pile cement soil composite pile, a static drilling root planting pile and the like appear in recent years. The stiff core mixing pile, the tubular pile cement-soil composite pile and the static drill root planting pile are all combined pile foundations consisting of an internal core pile and peripheral cement-soil, and the pile side bearing performance of the stiff core mixing pile, the tubular pile cement-soil composite pile and the static drill root planting pile is controlled by a core pile-cement-soil contact surface and a cement-soil body contact surface. The combined pile foundations such as static drilling root-planting piles and the like are successfully applied in coastal areas of eastern China, and obvious social and economic benefits are obtained, so that the method has remarkable popularization value.
At present, the research on the combined pile foundations such as a forced core mixing pile, a tubular pile cement soil composite pile, a static drilling root planting pile and the like is mainly field test and model test, however, the friction characteristic of a cement soil-soil body contact surface is only researched in the field test and the model test, and the friction characteristic of the core pile (prefabricated tubular pile) -cement soil contact surface is not researched. At present, in the design of composite pile foundations such as a stiffened core mixing pile, a tubular pile cement soil composite pile, a static drill root planting pile and the like, a core pile (a prefabricated tubular pile) and cement soil are assumed to be a whole all the time in the load transmission process, and the friction characteristic of a contact surface of the core pile (the prefabricated tubular pile) and the cement soil is not considered. However, the friction characteristic of the core pile (precast tubular pile) -cement-soil contact surface plays an important role in the load transfer process of the composite pile, and detailed research needs to be carried out on the friction characteristic, so that a theoretical basis is provided for the design of composite pile foundations such as a stiff core mixing pile, a tubular pile cement-soil composite pile, a static drill root planting pile and the like in actual engineering.
SUMMERY OF THE UTILITY MODEL
In order to research the friction performance of the prefabricated pipe pile-cement soil contact surface, the utility model provides a tubular pile-cement soil contact surface sample preparation device and friction characteristic research device thereof can be used to simulate the friction characteristic of the prefabricated tubular pile-cement soil contact surface under different cement soil strength conditions.
The utility model provides a technical scheme that its technical problem adopted is:
a kind of tubular pile-cement soil contact surface sample preparation device, including tubular pile mould and contact surface sample preparation mould;
the tubular pile die consists of a circular die and a bottom plate A; the circular mould is formed by connecting and combining two semicircular aluminum alloy plates through bolts A; a circular groove A is formed in the center of the bottom plate A and used for embedding a circular mold; the diameter of the circular groove A is the same as that of the circular die; concrete is poured in the tubular pile die and is used for manufacturing a model tubular pile;
the contact surface sample preparation mold consists of a large-diameter circular mold and a bottom plate B; the large-diameter circular die is formed by connecting and combining two large-diameter semicircular aluminum alloy plates through bolts B; a circular groove B is also formed in the center of the bottom plate B, and the diameter of the circular groove B is consistent with that of the model tubular pile and used for placing the model tubular pile; the bottom plate B is also provided with a concave circular ring, the circle center of the concave circular ring is superposed with the circle center of the circular groove B, and the diameter and the thickness of the concave circular ring are the same as those of the large-diameter circular mold and are used for embedding the large-diameter circular mold; a reserved space is formed between the model tubular pile and the large-diameter circular mold, and a cement soil sample which is uniformly stirred is poured in the reserved space and is used for manufacturing a model tubular pile-cement soil contact surface sample.
In the above technical scheme, further, the diameter ratio of the large-diameter circular die to the model tubular pile is not less than 2.
Further, the water content of the cement soil sample exceeds the liquid limit water content of the soil body.
The utility model also provides a shearing test device for researching the friction characteristic of the tubular pile-cement soil contact surface, which comprises a circular model box, a model tubular pile-cement soil contact surface sample, a counterforce beam and a loading motor, wherein the model tubular pile-cement soil contact surface sample is prepared by adopting the device; the circular model box consists of a model box base and a cylindrical model box frame welded on the base; the circular model box base consists of a bottom plate C and a support, and the bottom plate C is directly welded on the support; a round hole is formed in the center of the bottom plate C, and the diameter of the round hole is the same as that of the model pipe pile;
a model tubular pile-cement soil contact surface sample is placed at the center of the circular model box, and the lower end of the model tubular pile is positioned in the circular hole; a sand layer is filled in the circular model box; a layer of geotextile is arranged at the bottom of the sand layer; a plurality of vertical rigid pipes are fixed on the bottom plate, and a plurality of soil pressure sensors are arranged on the rigid pipes;
the loading motor is positioned above the model tubular pile and fixed on the counter-force beam; the counter-force beam is welded on the model box base through 2I-shaped steel.
Further, the ratio of the diameter of the circular mold box to the diameter of the large-diameter circular mold is not less than 10.
Further, the rigid pipes are uniformly distributed around the sample of the contact surface between the model pipe pile and the cement soil.
Further, the limit loading value of the loading motor is 100kN, and the stroke is 50 mm.
Further, the loading speed range of the loading motor is 0.1-5 mm/min.
The utility model also provides a tubular pile-soil cement contact surface friction characteristic research shear test device's test method, including following step:
firstly, manufacturing a model tubular pile, embedding a circular mold into a circular groove A in the center of a bottom plate A, then putting the uniformly stirred concrete into the circular mold, putting the tubular pile mold on a vibrating table for vibrating for 5 minutes, and taking the model tubular pile out of the tubular pile mold after curing the concrete for 28-60 days;
then, placing the model tubular pile into a circular groove in the center of the bottom plate, embedding a large-diameter circular mold into the concave circular ring, pouring a uniformly stirred cement soil sample into a space between the model tubular pile and the large-diameter circular mold, and taking out the model tubular pile-cement soil contact surface sample from the contact surface sample preparation mold after cement soil maintenance for 28-90 days; placing a model tubular pile-cement soil contact surface sample into the center of a circular model box, wherein the lower end of the model tubular pile is positioned in a circular hole in the center of a bottom plate of the circular model box, and the bottom of the cement soil sample is positioned on the bottom plate; laying a layer of geotextile on the bottom plate; then, a plurality of vertical rigid pipes are arranged on the bottom plate, a plurality of soil pressure sensors are arranged on the rigid pipes, and the rigid pipes are uniformly distributed around the model pipe pile-cement soil contact surface sample; then filling a sand layer in a space between the cylindrical model box frame of the model box and the tubular pile-cement soil contact surface; and loading the model pipe pile by a loading motor.
The inner wall of the circular die is smooth and consistent with the smooth degree of the inner wall of the actual prestressed pipe pile steel die. The utility model discloses a circular mould case is for boundary limit condition circular among the proof test, and tubular pile cement soil receives radial constraining force effect in the testing process.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the tubular pile mould of the utility model can manufacture a model tubular pile with smooth degree consistent with the actual contact surface of the prestressed tubular pile; the contact surface sample preparation mold can be used for preparing a precast tubular pile-cement soil contact surface model, and the form of the contact surface model is consistent with that of a precast pile-cement soil contact surface of a composite pile foundation in actual engineering.
2. The utility model discloses in adopt circular model case to carry out the shear test of precast pile-soil cement contact surface, boundary condition is similar with the boundary condition in the actual pile foundation load transmission process.
3. The utility model discloses in can change the ratio of cement soil and adjust the intensity of cement soil, can carry out the precast pile-cement soil contact surface shear test of cement soil intensity asynchronous.
Drawings
FIG. 1 is a side view of a pipe pile die;
FIG. 2 is a top view of a circular die of the pipe pile die;
FIG. 3 is a schematic view of a bottom plate of the tubular pile die;
FIG. 4 is a side view of a contact surface sampling mold;
FIG. 5 is a top view of a large diameter circular mold of a contact surface sample preparation mold;
FIG. 6 is a schematic view of a contact surface sample preparation mold base plate;
FIG. 7 is a schematic view of a shearing test device for researching friction characteristics of a tubular pile-cement soil contact surface;
in the figure: a tubular pile die 1, a circular die 1-1, a semicircular aluminum alloy plate 1-1, a bolt A1-1-2, a bottom plate A1-2, a circular groove A1-2-1, a model tubular pile 1-3, a contact surface sample preparation die 2, a large-diameter circular die 2-1, a large-diameter semicircular aluminum alloy plate 2-1, a bolt B2-1-2, a bottom plate B2-2, a circular groove B2-2-1, a concave circular ring 2-2, a reserved space 2-3, a cement soil sample 2-4, a model tubular pile-cement soil contact surface sample 2-5, a circular model box 3, a model box base 3-1, a bottom plate C3-1-1, a support 3-1-2, 3-1-3 parts of circular holes, 3-2 parts of a cylindrical model box frame, 3-3 parts of a sandy soil layer, 3-4 parts of rigid pipes, 3-5 parts of a soil pressure sensor, 3-6 parts of geotextile, 4 parts of counterforce beams and 5 parts of a loading motor.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific embodiments.
As shown in fig. 7, the device for preparing a sample of a pipe pile-cement contact surface and a shear test device for researching friction characteristics of the contact surface are provided, wherein the device for preparing a sample of a pipe pile-cement contact surface comprises a pipe pile die 1 and a contact surface sample die 2; the shear test device for the friction characteristic research of the contact surface comprises five parts, namely a circular model box 3, model pipe pile-cement soil contact surface samples 2-5, a counter-force beam 4 and a loading motor 5.
The tubular pile die 1 consists of a circular die 1-1 and a bottom plate A1-2; the circular mold 1-1 is formed by connecting and combining two semicircular aluminum alloy plates 1-1-1 through bolts A1-1-2, and the diameter of the circular mold 1-1 is 100 mm; the side length of the bottom plate A1-2 is 300mm, the thickness of the bottom plate A is 20mm, a circular groove A1-2-1 with the diameter of 100mm exists in the center of the bottom plate A, and the depth of the circular groove A1-2-1 is 10 mm; the contact surface sample preparation mold 2 consists of a large-diameter circular mold 2-1 and a bottom plate B2-2; the large-diameter circular mold 2-1 is formed by connecting and combining two large-diameter semicircular aluminum alloy plates 2-1-1 through bolts B2-1-2, and the diameter of the large-diameter circular mold is 200 mm; the side length of the bottom plate B2-2 of the contact surface sample preparation mold is 400mm, the thickness of the bottom plate is 10mm, a circular groove B2-2-1 is also formed in the center of the bottom plate, the diameter of the circular hole is 100mm, and the depth of the circular hole is 8 mm; the bottom plate B2-2 is also provided with a concave circular ring 2-2-2, the diameter of the concave circular ring is 200mm, and the depth of the concave circular ring is 5 mm.
The circular model box 3 consists of a model box base 3-1 and a cylindrical model box frame 3-2 welded on the base; the model box base 3-1 consists of a bottom plate C3-1-1 and a support 3-1-2; the bottom plate C3-1-1 is directly welded on the support 3-1-2; the bottom plate is a 30mm thick steel plate, the diameter of the bottom plate is 2200mm, a round hole 3-1-3 is formed in the center of the bottom plate C, and the diameter of the round hole 3-1-3 is 105 mm; the circular model box frame 3-2 is made of a steel plate with the thickness of 10mm and the diameter is 2000 mm; a sand layer 3-3 with certain compactness is filled in the circular mould box 3; the sandy soil layer 3-3 is filled by adopting different methods according to the design compactness requirement; the sand layer filling method comprises a sand rain method (when the designed compactness is small) and a layered tamping method (when the designed compactness is large); a layer of geotextile 3-6 is placed at the bottom of the sand layer 3-3, and the thickness of the geotextile is 20 mm; a soil pressure sensor 3-5 is pre-embedded in the sandy soil layer 3-3 to measure horizontal soil pressure, and the soil pressure sensor is fixed on the rigid pipe 3-4; the diameter of the rigid pipe 3-4 is 10mm, the rigid pipe is vertically fixed on a bottom plate C3-1-1, four rigid pipes are arranged in the circular model box 3 and are symmetrically distributed around the model pile; a model tubular pile-cement soil contact surface sample 2-5 is placed at the center of the circular model box 3, and one end of the model tubular pile 1-3 enters a central circular hole 3-1-3 of a bottom plate of the model box; the counter-force beam 4 is welded on the model box base 3-1 through 2I-shaped steels 4-1; the loading motor 5 is fixed on the counter-force beam 4 by a fixing device and is positioned above the model tubular piles 1-3.
The working process of the utility model is as follows:
firstly, a model tubular pile 1-3 needs to be manufactured, in the manufacturing process of the model tubular pile, a circular mold 1-1 is embedded into a circular groove A1-2-1 in the center of a bottom plate A1-2, a uniformly stirred concrete sample is placed into the circular mold 1-1, then the tubular pile mold 1 is placed on a vibrating table to be vibrated for 5 minutes, the tubular pile mold and the model tubular pile are integrally placed into a standard curing chamber to be cured after the vibration is finished, and the model tubular pile 1-3 is taken out of the tubular pile mold 1 after being cured for 28 days.
Then, placing the model tubular pile 1-3 into a circular hole 2-1-1 in the center of a bottom plate of a contact surface sample preparation mold, embedding a large-diameter circular mold 2-1 into a concave circular ring 2-2-2 of the bottom plate, pouring a uniformly stirred cement soil sample 2-4 into a space 2-3 between the model tubular pile 1-3 and the large-diameter circular mold 2-1, placing the whole contact surface sample preparation mold into a standard curing chamber, and taking the model tubular pile-cement soil contact surface sample 2-5 out of the contact surface sample preparation mold 2 after curing for 28 days; placing the model tubular pile-cement soil contact surface 2-5 at the center of the circular model box 3, enabling the protruding part of the model tubular pile 1-3 to enter a circular hole 3-1-3 in the center of a bottom plate of the circular model box, and enabling a cement soil sample 2-4 to be on the bottom plate C3-1-1; filling a sandy soil layer 3-3 with certain compactness in a space between a cylindrical model case frame 3-2 and a tubular pile-cement soil contact surface 2-5 of a circular model case, preparing the sandy soil layer 3-3 by adopting a sand rain method when the compactness of the sandy soil layer is required by design, obtaining the compactness of a soil body required by design by controlling the falling distance between the bottom of a sand falling device and the surface of a test soil body, filling the sandy soil layer by adopting a layered tamping method when the compactness of the sandy soil layer is required by design, and obtaining the compactness of the soil body required by design by controlling the dry density and the volume of the sandy soil; after the test preparation work is finished, the model pile is loaded through the loading motor 5, a certain loading rate is adopted for loading according to test requirements, the change condition of the horizontal soil pressure in the loading process is measured by the soil pressure sensor, the load and the displacement applied by the loading motor 5 can be automatically read and stored, and the change rule of the horizontal soil pressure and the relative displacement relation of the friction resistance of the contact surface of the precast tubular pile and the cement soil in the test process can be measured in the test.
Claims (8)
1. The utility model provides a tubular pile-soil cement contact surface system appearance device which characterized in that: comprises a tubular pile die (1) and a contact surface sample preparation die (2);
the tubular pile die (1) consists of a circular die (1-1) and a bottom plate A (1-2); the circular mold (1-1) is formed by connecting and combining two semicircular aluminum alloy plates (1-1-1) through bolts A (1-1-2); a circular groove A (1-2-1) is formed in the center of the bottom plate A (1-2) and used for embedding a circular mold (1-1); the diameter of the circular groove A (1-2-1) is the same as that of the circular mould (1-1); concrete is poured in the pipe pile die (1) and is used for manufacturing a model pipe pile (1-3);
the contact surface sample preparation mold (2) consists of a large-diameter circular mold (2-1) and a bottom plate B (2-2); the large-diameter circular mold (2-1) is formed by connecting and combining two large-diameter semicircular aluminum alloy plates (2-1-1) through bolts B (2-1-2); a circular groove B (2-2-1) is also formed in the center of the bottom plate B (2-2), and the diameter of the circular groove B (2-2-1) is consistent with that of the model tubular pile (1-3) and used for placing the model tubular pile (1-3); the bottom plate B (2-2) is also provided with a concave circular ring (2-2-2), the circle center of the concave circular ring (2-2-2) is superposed with the circle center of the circular groove B (2-2-1), and the diameter and the thickness of the concave circular ring are the same as those of the large-diameter circular mold (2-1) and are used for embedding the large-diameter circular mold (2-1); the method is characterized in that a reserved space (2-3) is formed between the model tubular pile (1-3) and the large-diameter circular mold (2-1), and a cement soil sample (2-4) which is uniformly stirred is poured in the reserved space (2-3) and is used for manufacturing the model tubular pile-cement soil contact surface sample (2-5).
2. The pile-soil interface sample preparation device according to claim 1, wherein the ratio of the diameter of the large diameter circular mold (2-1) to the diameter of the model pile (1-3) is not less than 2.
3. The tubular pile-cement soil contact surface sample preparation device as claimed in claim 1, wherein the water content of the cement soil sample (2-4) exceeds the water content of the liquid limit of a soil body.
4. The utility model provides a tubular pile-soil cement contact surface friction characteristic research shear test device which characterized in that: the device comprises a circular model box (3), model tubular pile-cement soil contact surface samples (2-5), a reaction beam (4) and a loading motor (5), wherein the model tubular pile-cement soil contact surface samples (2-5) are manufactured by adopting the device as claimed in any one of claims 1-3; the circular model box (3) consists of a model box base (3-1) and a cylindrical model box frame (3-2) welded on the base; the model box base (3-1) consists of a bottom plate C (3-1-1) and a support (3-1-2), and the bottom plate C (3-1-1) is directly welded on the support (3-1-2); a round hole (3-1-3) is formed in the center of the bottom plate C (3-1-1), and the diameter of the round hole (3-1-3) is the same as that of the model tubular pile (1-3);
a model tubular pile-cement soil contact surface sample (2-5) is placed at the center of the circular model box (3), and the lower end of the model tubular pile (1-3) is positioned in the circular hole (3-1-3); a sand layer (3-3) is filled in the circular model box (3); a layer of geotextile (3-6) is arranged at the bottom of the sand layer (3-3); a plurality of vertical rigid pipes (3-4) are fixed on the bottom plate, and a plurality of soil pressure sensors (3-5) are arranged on the rigid pipes (3-4);
the loading motor (5) is positioned above the model tubular pile (1-3) and is fixed on the counter-force beam (4); the reaction beam (4) is welded on the model box base (3-1) through 2I-shaped steel (4-1).
5. The pipe pile-cement soil contact surface friction characteristic research shear test device of claim 4, wherein the ratio of the diameter of the circular mold box (3) to the diameter of the large-diameter circular mold (2-1) is not less than 10.
6. The tubular pile-cement soil contact surface friction characteristic research shear test device of claim 4, wherein the rigid tubes (3-4) are uniformly distributed around the model tubular pile-cement soil contact surface sample (2-5).
7. The shear test device for researching friction characteristics of the tubular pile-cement soil contact surface according to claim 4, wherein the limit loading value of the loading motor is 100kN, and the stroke is 50 mm.
8. The shear test device for researching friction characteristics of the tubular pile-cement soil contact surface according to claim 4, wherein the loading speed range of the loading motor is 0.1-5 mm/min.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921010591.5U CN210684813U (en) | 2019-07-01 | 2019-07-01 | Tubular pile-cement soil contact surface sample preparation device and friction characteristic research device thereof |
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| CN201921010591.5U CN210684813U (en) | 2019-07-01 | 2019-07-01 | Tubular pile-cement soil contact surface sample preparation device and friction characteristic research device thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110359500A (en) * | 2019-07-01 | 2019-10-22 | 浙江大学 | A kind of tubular pole-cement soil contact face sample preparation device and contact surface frictional behavior research shearing test device and test method |
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2019
- 2019-07-01 CN CN201921010591.5U patent/CN210684813U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110359500A (en) * | 2019-07-01 | 2019-10-22 | 浙江大学 | A kind of tubular pole-cement soil contact face sample preparation device and contact surface frictional behavior research shearing test device and test method |
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