CN112962685A - Pile pressing verticality control injection device for pile foundation centrifugal test - Google Patents
Pile pressing verticality control injection device for pile foundation centrifugal test Download PDFInfo
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- CN112962685A CN112962685A CN202110138614.6A CN202110138614A CN112962685A CN 112962685 A CN112962685 A CN 112962685A CN 202110138614 A CN202110138614 A CN 202110138614A CN 112962685 A CN112962685 A CN 112962685A
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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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- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
Abstract
The invention discloses a pile pressing verticality control injection device for a pile foundation centrifugal test. The perpendicularity control system comprises a fixed upper plate and a fixed lower plate which are arranged in parallel, the fixed upper plate and the fixed lower plate are both circular plates, and the model pile is positioned at the circle center of each circular plate; 4 guide grooves are formed in the upper fixed plate along the radial direction, and the same guide grooves are formed in the lower fixed plate and the position corresponding to the upper fixed plate and used for providing restraint for the guide plates; the upper end and the lower end of the guide plate are both positioned in the guide groove and can move in the guide groove along the radial direction, so that the installation requirements of different pile diameters are met. The device can be used for injecting the pile foundation into a seabed soil body, can be suitable for pile pressing penetration with different pile diameters by changing the distance between the guide plates, and can ensure the verticality of the pressed pile in the injection process so as to meet the test requirement of the later period.
Description
Technical Field
The invention belongs to the technical field of centrifugal tests, and particularly relates to a pile pressing verticality control injection device for a pile foundation centrifugal test. The device can be used for injecting the pile foundation into a seabed soil body, can be suitable for pile pressing penetration with different pile diameters by changing the distance between the guide plates, and can ensure the verticality of the pressed pile in the injection process so as to meet the test requirement of the later period.
Background
The offshore pile foundation is an important foundation type, which is installed on the seabed surface in a driving or static pressure injection mode and is used for supporting upper structures such as offshore wind turbines, fixed offshore oil and gas platforms and the like, and the foundation type plays an important role in the foundation form of shallow sea structures at present.
In order to explore the bearing capacity of the pile foundation, a model test mode is generally adopted to determine the bearing capacity of the pile foundation, and if the test is carried out under a normal gravity condition, the difference from an actual result is large because soil is a material related to self weight. In geotechnical engineering, the self-weight stress of soil generally dominates, the mechanical property of soil changes with the stress level, and the conventional small scale model cannot reproduce the property of a prototype because the self-weight stress is far lower than that of the prototype. The supergravity centrifugal model test compensates the dead weight loss of the geotechnical structure caused by the scale reduction of the model by enabling the model to bear the action of centrifugal acceleration higher than the gravity acceleration, thereby reproducing the characteristics of the prototype rock-soil body and structure. The soil body material in the hypergravity simulation can better reflect the characteristics of the prototype soil body such as the particle scattering property, the stress correlation, the friction characteristic, the strong nonlinearity, the shear expansion property, the heterogeneity, the stress history correlation and the like. The supergravity centrifugal model test is particularly effective in simulating the characteristics of rock-soil structures with dead weight as a main load, so that the supergravity centrifugal model test is widely applied.
However, in a centrifugal model test, a pile needs to be statically installed in a seabed soil body, and at present, a jack is generally adopted for directly pressing in, but the pile is likely to incline in the pressing-in process by adopting the mode, so that an initial test error is caused, and even if some devices capable of controlling the verticality of the pile are provided, the device cannot be suitable for the situations of different pile diameters.
Disclosure of Invention
The invention provides a pile pressing verticality control injection device for a pile foundation centrifugal test, which can inject a pile foundation into a seabed soil body, is suitable for pile pressing and soil injection with different pile diameters by changing the distance between guide plates, and ensures the verticality of the pile pressing in the injection process so as to meet the test requirement of the later stage.
The invention adopts the following technical scheme:
a pile pressing verticality control injection device for a pile foundation centrifugal test comprises a model pile, a loading injection system, a verticality control system and a centrifuge model box; a top plate is arranged at the top of the centrifuge model box, and soil is filled in the centrifuge model box; the model pile is a tested rigid pile pipe pile, the specific size of the model pile is determined by the test requirement, and the model pile is partially buried in the soil; the loading and injecting system is used for loading the model pile so as to inject the model pile into a seabed soil body;
the verticality control system comprises a guide plate, a guide plate fixing rod, a guide groove, a fixing lower plate, a fixing upper plate, an upper plate connecting rod, a lower plate connecting rod, a support rod and a support fixing device; the support fixing device is fixed on the top plate, is fixedly connected with the support rods and is used for supporting the verticality control system, the support rods are arranged in the circumferential direction of the model pile, and the bottoms of the support rods are fixedly connected with the upper fixing plate; the fixed upper plate and the fixed lower plate are arranged in parallel and are circular ring-shaped plates, and the model pile is positioned at the circle center of the circular ring-shaped plates; 4 guide grooves are formed in the upper fixed plate along the radial direction, and the same guide grooves are formed in the lower fixed plate and the position corresponding to the upper fixed plate and used for providing restraint for the guide plates; the upper end and the lower end of the guide plate are positioned in the guide grooves and can move in the guide grooves along the radial direction, so that the installation requirements of different pile diameters are met; the fixed upper plate is fixedly connected with the fixed lower plate through 4 upper and lower plate connecting rods; the inboard and the model stake in close contact with of deflector, the outside is spacing through the deflector dead lever.
In the above technical solution, further, the loading penetration system includes a hydraulic jack, a jack fixing device, a jack guide rod, and a pile buffer plate; hydraulic jack passes through jack fixing device to be fixed on the roof, and hydraulic jack is perpendicular downwards, and jack guide arm one end is connected the jack, and the top of stake buffer board and then contact model is connected to one end, and the stake buffer board is used for buffering jack load, prevents that pile tip stress is too big to lead to buckling failure.
Furthermore, a guide bearing is arranged on one side of the guide plate close to the pile, and the guide bearing is used for reducing resistance in the penetration process; balls are arranged on the front and back surfaces of the upper side and the lower side of the guide plate and used for reducing friction between the guide plate and the guide groove.
Further, the guide groove is divided into two parts, and the two parts jointly penetrate through the fixed upper plate and the fixed lower plate: the first part is the area where the guide plate is located, and the groove depth is 1/3 the thickness of the fixed upper plate and the fixed lower plate; the second part is used for fixing a guide plate fixing rod, the guide plate fixing rod penetrates through guide grooves of the fixed lower plate and the fixed upper plate so as to limit the upper guide rod and the lower guide rod, and the groove width of the second part is smaller than that of the first part; the two ends of the guide plate fixing rod are fixed through upper and lower bolts.
Further, the angle between any two adjacent guide grooves is 90 °.
Further, the jack fixing device is fixed on the top plate through four bolt screws.
The invention has the following advantages:
according to the pile pressing verticality control injection device for the pile foundation centrifugal test, the pile foundation can be injected into a seabed soil body through the device, the pile pressing burial with different pile diameters can be further suitable through changing the distance between the guide plates, and the verticality of the pile pressing is ensured in the injection process, so that the later test requirement is met.
Drawings
FIG. 1 is a schematic view of a sub-module of the present invention;
FIG. 2 is a front view of the present invention;
FIG. 3 is a top view of section A-A of the present invention;
FIG. 4 is a top view of section B-B of the present invention;
FIG. 5 is a front view of the deflector of the present invention;
FIG. 6 is a top view of the deflector of the present invention;
the device comprises a model pile 1, a loading injection system 2, a verticality control system 3, a centrifuge model box 4, a hydraulic jack 5, a jack fixing device 6, a jack guide rod 7, a pile buffer plate 8, a top plate 9, a guide plate 10, a guide plate fixing rod 11, a guide groove 12, a fixing lower plate 13, a fixing upper plate 14, an upper plate connecting rod 15, a lower plate connecting rod 15, a support rod 16, a support fixing device 17, an upper bolt 18, a lower bolt 18, a bolt channel 19, a guide bearing 20 and a ball 21.
Detailed Description
Fig. 1 and 2 show a pile-pressing verticality control injection device for a pile foundation centrifugal test, which comprises a model pile 1, a loading injection system 2, a verticality control system 3 and a centrifuge model box 4; a top plate 9 is arranged at the top of the centrifuge model box 4, and soil is filled in the centrifuge model box; the model pile 1 is a tested rigid pile pipe pile, the specific size of the model pile 1 is determined by the test requirement, and the model pile 1 is partially buried in the soil; the loading and injecting system 2 is used for loading the model pile 1 so as to inject the model pile 1 into the seabed soil body;
the verticality control system 3 comprises a guide plate 10, a guide plate fixing rod 11, a guide groove 12, a fixing lower plate 13, a fixing upper plate 14, an upper plate connecting rod 15, a lower plate connecting rod 15, a support rod 16 and a support fixing device 17; the support fixing device 17 is fixed on the top plate 9, is fixedly connected with the support rods 16 and is used for supporting the verticality control system 3, 4 support rods 16 are arranged along the annular direction of the model pile 1, and the bottom of each support rod is fixedly connected with the upper fixing plate 14; the fixed upper plate 14 and the fixed lower plate 13 are arranged in parallel and are circular plates, and the model pile 1 is positioned at the circle center of the circular plates; 4 guide grooves 12 are formed in the upper fixed plate 14 in the radial direction, and the same guide grooves 12 are formed in the lower fixed plate 13 and correspond to the upper fixed plate 14, so that constraint is provided for the guide plates 10; the upper end and the lower end of the guide plate 10 are both positioned in the guide groove 12 and can move in the guide groove 12 along the radial direction, so that the installation requirements of different pile diameters are met; the fixed upper plate 14 is fixedly connected with the fixed lower plate 13 through 4 upper and lower plate connecting rods 15; the inner side of the guide plate 10 is closely contacted with the model pile 1, and the outer side is limited by a guide plate fixing rod 11.
The loading penetration system 2 comprises a hydraulic jack 5, a jack fixing device 6, a jack guide rod 7 and a pile buffer plate 8; hydraulic jack 5 passes through jack fixing device 6 to be fixed on roof 9, and hydraulic jack 5 is perpendicular downwards, and jack 7 one end connection jack of jack guide arm, one end connection pile buffer board 8 and then the top of contact model stake 1, pile buffer board 8 are used for buffering jack load, prevent that pile tip stress is too big to lead to buckling failure.
The guide plate 10 is provided with a guide bearing 20 on one side close to the pile, and the guide bearing 20 is used for reducing the resistance in the penetration process; balls 21 are arranged on both the upper and lower front and back sides of the guide plate 10 for reducing friction between the guide plate 10 and the guide groove 12.
The guide groove 12 is divided into two parts, which jointly penetrate through the fixed upper plate 14 and the fixed lower plate 13: the first part is the area where the guide plate 10 is located, and the groove depth is 1/3 the thickness of the fixed upper plate 14 and the fixed lower plate 13; the second part is a bolt channel 19 for fixing the guide plate fixing rod 11, the guide plate fixing rod 11 passes through the fixing lower plate 13 and the guide groove 12 of the fixing upper plate 14 so as to limit the upper guide rod 17 and the lower guide rod 18, and the groove width of the second part is smaller than that of the first part; both ends of the guide plate fixing rod 11 are fixed by upper and lower bolts 18.
The angle between any two adjacent guide grooves 12 is 90 °.
The jack fixing device 6 is fixed on the top plate 9 by four bolt screws.
Claims (5)
1. A pile pressing verticality control injection device for a pile foundation centrifugal test is characterized by comprising a model pile (1), a loading injection system (2), a verticality control system (3) and a centrifuge model box (4); a top plate (9) is arranged at the top of the centrifuge model box (4), and soil is filled in the centrifuge model box; the model pile (1) is a tested rigid pile pipe pile, the specific size of the model pile (1) is determined by the test requirement, and the model pile (1) is partially buried in the soil; the loading and injecting system (2) is used for loading the model pile (1) so as to inject the model pile (1) into a seabed soil body;
the verticality control system (3) comprises a guide plate (10), a guide plate fixing rod (11), a guide groove (12), a fixing lower plate (13), a fixing upper plate (14), an upper and lower plate connecting rod (15), a support rod (16) and a support fixing device (17); the support fixing device (17) is fixed on the top plate (9), is fixedly connected with the support rods (16) and is used for supporting the verticality control system (3), 4 support rods (16) are arranged in the circumferential direction of the model pile (1), and the bottom of each support rod is fixedly connected with the fixed upper plate (14); the fixed upper plate (14) and the fixed lower plate (13) are arranged in parallel and are both circular plates, and the model pile (1) is positioned at the circle center of the circular plates; 4 guide grooves (12) are formed in the upper fixing plate (14) in the radial direction, and the same guide grooves (12) are formed in the lower fixing plate (13) at positions corresponding to the upper fixing plate (14) and used for providing restraint for the guide plates (10); the upper end and the lower end of the guide plate (10) are both positioned in the guide groove (12) and can move in the guide groove (12) along the radial direction, so that the installation requirements of different pile diameters are met; the fixed upper plate (14) is fixedly connected with the fixed lower plate (13) through 4 upper and lower plate connecting rods (15); the inner side of the guide plate (10) is tightly contacted with the model pile (1), and the outer side of the guide plate is limited by a guide plate fixing rod (11); the guide groove (12) is divided into two parts, and the two parts jointly penetrate through the fixed upper plate (14) and the fixed lower plate (13): the first part is the area where the guide plate (10) is located, and the groove depth of the first part is 1/3 of the thickness of the fixed upper plate (14) and the fixed lower plate (13); the second part is used for fixing a guide plate fixing rod (11), the guide plate fixing rod (11) penetrates through a fixing lower plate (13) and a guide groove (12) of a fixing upper plate (14) so as to limit an upper guide rod (17) and a lower guide rod (18), and the groove width of the second part is smaller than that of the first part; two ends of the guide plate fixing rod (11) are fixed through upper and lower bolts (18).
2. The pile driving verticality control injection device for pile foundation centrifugal test according to claim 1, wherein the loading injection system (2) comprises a hydraulic jack (5), a jack fixing device (6), a jack guide rod (7) and a pile buffer plate (8); hydraulic jack (5) are fixed on roof (9) through jack fixing device (6), and hydraulic jack (5) are perpendicular downwards, and jack is connected to jack guide arm (7) one end, and stake buffer board (8) and then the top of contact model stake (1) are connected to one end, and stake buffer board (8) are used for buffering the jack load, prevent that pile tip stress is too big to lead to buckling failure.
3. The device for controlling the verticality of the pressed pile for the centrifugal test of the pile foundation according to claim 1, wherein the guide plate (10) is provided with a guide bearing (20) at one side close to the pile, and the guide bearing (20) is used for reducing the resistance in the process of penetration; balls (21) are arranged on the front and back surfaces of the upper side and the lower side of the guide plate (10) and used for reducing friction between the guide plate (10) and the guide groove (12).
4. The apparatus for controlling penetration of verticality of pile-pressing for centrifugal test of pile foundation according to claim 1, wherein the angle between any two adjacent guide slots (12) is 90 °.
5. The pile pressing verticality control penetration device for the pile foundation centrifugal test according to claim 1, wherein the jack fixing device (6) is fixed on the top plate (9) by four bolt screws.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110138614.6A CN112962685B (en) | 2021-02-01 | 2021-02-01 | Pile pressing verticality control injection device for pile foundation centrifugal test |
| PCT/CN2021/080898 WO2022160424A1 (en) | 2021-02-01 | 2021-03-16 | Penetration device capable of pile pressing perpendicularity control for pile foundation centrifugal test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110138614.6A CN112962685B (en) | 2021-02-01 | 2021-02-01 | Pile pressing verticality control injection device for pile foundation centrifugal test |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112962685A true CN112962685A (en) | 2021-06-15 |
| CN112962685B CN112962685B (en) | 2022-04-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110138614.6A Active CN112962685B (en) | 2021-02-01 | 2021-02-01 | Pile pressing verticality control injection device for pile foundation centrifugal test |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN112962685B (en) |
| WO (1) | WO2022160424A1 (en) |
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| SU975916A1 (en) * | 1981-03-16 | 1982-11-23 | Sev Vnii Str Magistralnykh Tru | Apparatus for static testing of foundations |
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| CN202577380U (en) * | 2012-05-29 | 2012-12-05 | 中国建筑第四工程局有限公司 | Steel member perpendicularity correcting device for construction of upright column piles |
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| CN105714861A (en) * | 2016-04-18 | 2016-06-29 | 青岛理工大学 | Vertical loading method for simulating pile sinking process of static pressure pile |
| CN207891932U (en) * | 2017-12-28 | 2018-09-21 | 浙江大学 | A kind of controllable confining pressure is used to simulate the experimental provision of closing pile installation process |
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| CN111456117A (en) * | 2020-04-02 | 2020-07-28 | 中北大学 | Pile forming loading model test device and method for stiff composite pile |
| CN112160353A (en) * | 2020-09-01 | 2021-01-01 | 温州大学 | Pile-soil interaction indoor test device under combined cyclic loading effect and installation method |
| CN112160349A (en) * | 2020-09-01 | 2021-01-01 | 温州大学 | Full-life-cycle geotechnical centrifuge test device for driven pile and operation method thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BR102015003467B1 (en) * | 2015-02-18 | 2023-04-25 | Marcos Silva Carceles | IMPACT GENERATING EQUIPMENT FOR DYNAMIC LOADING TEST |
| SG11202009729VA (en) * | 2018-05-25 | 2020-10-29 | Jibanshikenjo Co Ltd | Pile rapid loading testing device |
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2021
- 2021-02-01 CN CN202110138614.6A patent/CN112962685B/en active Active
- 2021-03-16 WO PCT/CN2021/080898 patent/WO2022160424A1/en active Application Filing
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU975916A1 (en) * | 1981-03-16 | 1982-11-23 | Sev Vnii Str Magistralnykh Tru | Apparatus for static testing of foundations |
| KR100914058B1 (en) * | 2008-04-24 | 2009-08-28 | 백규호 | Static loading apparatus for pile load test with removable forcing device and its testing method thereof |
| CN102912812A (en) * | 2011-08-03 | 2013-02-06 | 同济大学 | Model test device for simulating jacked pile driving process |
| CN202577380U (en) * | 2012-05-29 | 2012-12-05 | 中国建筑第四工程局有限公司 | Steel member perpendicularity correcting device for construction of upright column piles |
| CN103953074A (en) * | 2014-04-28 | 2014-07-30 | 青岛理工大学 | Opened tubular pile hammering injection and static load simulation experiment device and method |
| CN204690808U (en) * | 2015-06-09 | 2015-10-07 | 长安大学 | A kind of stake position restraint device for pile foundation model testing |
| CN204803928U (en) * | 2015-07-21 | 2015-11-25 | 中铁隧道集团有限公司 | Major diameter overlength test pile disappears and hinders sleeve |
| CN105714861A (en) * | 2016-04-18 | 2016-06-29 | 青岛理工大学 | Vertical loading method for simulating pile sinking process of static pressure pile |
| CN207891932U (en) * | 2017-12-28 | 2018-09-21 | 浙江大学 | A kind of controllable confining pressure is used to simulate the experimental provision of closing pile installation process |
| CN210049296U (en) * | 2019-03-22 | 2020-02-11 | 福建荔建工程技术有限公司 | Pile foundation high strain detection device |
| CN111456117A (en) * | 2020-04-02 | 2020-07-28 | 中北大学 | Pile forming loading model test device and method for stiff composite pile |
| CN112160353A (en) * | 2020-09-01 | 2021-01-01 | 温州大学 | Pile-soil interaction indoor test device under combined cyclic loading effect and installation method |
| CN112160349A (en) * | 2020-09-01 | 2021-01-01 | 温州大学 | Full-life-cycle geotechnical centrifuge test device for driven pile and operation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2022160424A1 (en) | 2022-08-04 |
| CN112962685B (en) | 2022-04-26 |
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