CN218444904U - Building foundation pile strength detection experimental device - Google Patents
Building foundation pile strength detection experimental device Download PDFInfo
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- CN218444904U CN218444904U CN202222462981.4U CN202222462981U CN218444904U CN 218444904 U CN218444904 U CN 218444904U CN 202222462981 U CN202222462981 U CN 202222462981U CN 218444904 U CN218444904 U CN 218444904U
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Abstract
Building foundation pile intensity detection experimental apparatus relates to the vertical static test equipment of pile foundation. The device comprises a test foundation pile (1), a bearing platform seat (2), a cross beam (3), a bearing block (4) and a main jack (5), wherein the bearing platform seat is arranged on the left side and the right side of the test foundation pile, the cross beam is arranged at the top end of the bearing platform seat, and the main jack is arranged in the center position on the cross beam; the loading device is characterized by further comprising a loading disc (7) and auxiliary jacks (6), wherein the loading disc is arranged under the main jack, a piston rod of the main jack is fixed at the circle center position of the loading disc, at least three auxiliary jacks are arranged on the periphery of the main jack, a cylinder body of each auxiliary jack is fixed on the cross beam, a piston rod of each auxiliary jack is connected with the upper surface of the loading disc, and connecting points of the piston rods of the auxiliary jacks and the loading disc are located on the same circumference with the piston rod of the main jack as the circle center and are uniformly distributed. The device solves the problems that the existing pile foundation vertical static load test device applies pressure by adopting a jack, and the experimental data is inaccurate due to unstable stress of the pile foundation in the pressure stabilizing process.
Description
Technical Field
The utility model relates to a vertical static test equipment of pile foundation, concretely relates to vertical resistance to compression static of single pile maintains load method at a slow speed to pile foundation experimental apparatus's improvement technique.
Background
At present, when a plurality of quality supervision departments and engineering supervision units control the construction quality and the strength of a pile foundation, the design strength grade is still used as a quality acceptance standard, and when the pile strength does not reach the design strength grade, the construction quality of the pile foundation engineering is considered to be unqualified.
The vertical static load test of the existing common pile foundation detection method adopts a test method close to the actual working condition of a vertical compression pile to determine the vertical (compression) ultimate bearing capacity of a single pile, which is used as a design basis, or sample test and evaluation are carried out on the bearing capacity of an engineering pile. When the measuring elements for counter-force at the bottom of pile, stress and strain of pile body are buried, the limit side resistance and limit end resistance of each soil layer around pile can be directly measured. Except that the test loading of the engineering pile with the limit bearing capacity controlled by the pile body bearing capacity is 1.5-2 times of the design value of the bearing capacity, other test piles are loaded to be damaged.
Chinese patent document ZL20191063 main top oil return control valve 1196.7 discloses a single-pile vertical compression-resistant static load test method and a test device thereof. According to the technology, the jack device is used for applying pressure to jack up the other part of the pressure beam, and the auger stem, the pull rod and the pressure beam are matched to generate reaction force to the pile foundation to be tested, so that the vertical compression bearing capacity of a single pile of the pile foundation to be tested is tested.
The test method of the vertical compression-resistant static load test of the single pile is divided into a slow-speed load maintaining method and a fast load maintaining method. The load maintaining time, the loading measurement and reading interval time, the settling relative stability convergence standard and the unloading measurement and reading of each stage of the two test methods are different. The slow method is a standard test method which is generally accepted in China and is used for decades, is the only reference standard of the vertical compression resistance bearing capacity acceptance detection method of other engineering piles, and is the most credible method for obtaining the design parameter specified value of the industry or local standard related to pile foundation design.
The method for maintaining the load of the single-pile vertical compression-resistant static load at a low speed comprises the following steps: load is added to the test pile in sections according to certain requirements, each stage of load is kept unchanged until the sinking amount of the pile top reaches a certain specified relatively stable standard (the sinking amount per hour does not exceed 0.1mm and appears for 2 times continuously), and then the next stage of load is continuously added. When the specified test termination condition is reached, the loading is stopped, the classification is unloaded until the zero load, and the test period is generally 3-7d.
The test steps are as follows: 1. and measuring and reading the settlement amount of the pile top according to 5, 15, 30, 45 and 60min after each level of load is applied, and measuring and reading once every 30min later. 2. The test pile settlement is relatively stable standard, the pile top settlement in each hour is not more than 0.1mm, and the test pile settlement occurs twice continuously (from the 30 th min after the application of the classified load, the settlement observation value of every 30min is calculated according to three times of 1.5h continuously). 3. And when the settlement rate of the pile top reaches a relatively stable standard, applying the next stage of load. 4. And (3) during unloading, maintaining the load of each stage for lh, and measuring and reading the settlement of the pile top according to 15, 30 and 60min, so that the load of the stage one can be unloaded. And after unloading to zero, measuring and reading the residual settlement of the pile top, wherein the maintaining time is 3h, the measuring and reading time is 15 th and 30min, and the measuring and reading are carried out once every 30min later. The test steps show that the pressure stabilizing process is very important in the single-pile vertical compression-resistant static load slow-speed load maintaining experiment.
The existing experimental device including the above patent technology applies pressure by adopting a jack which is arranged on a supporting structure built on a pile foundation. Most of experimental devices need to be provided with a concrete balancing weight on a supporting structure according to needs so as to ensure that the acting force applied to the pile foundation by the jack reaches the experimental requirements. Because bearing structure is temporary construction, in addition the balancing weight of steady voltage, can not guarantee the experimental apparatus equilibrium, carry out the steady voltage in-process at the jack, apply for the power of pile foundation can not guarantee to hang down straightness (as shown in fig. 3), pile foundation atress is unstable, consequently can cause the experimental data inaccurate.
SUMMERY OF THE UTILITY MODEL
The utility model provides a building foundation pile intensity testing experimental apparatus, it has solved the vertical static test device of current pile foundation and has exerted pressure and all adopt a jack, and the steady voltage in-process, pile foundation atress is unstable, causes the unsafe problem of experimental data.
In order to solve the above problem, the utility model adopts the following technical scheme: the building foundation pile strength detection experimental device comprises a test foundation pile 1, a bearing platform seat 2, a cross beam 3, a bearing block 4 and a main jack 5, wherein the bearing platform seat 2 is arranged on the left side and the right side of the test foundation pile 1, the cross beam 3 is arranged at the top end of the bearing platform seat 2, and the main jack 5 is arranged in the center of the cross beam 3; the device is characterized by further comprising a loading disc 7 and auxiliary jacks 6, wherein the loading disc 7 is arranged under the main jack 5, piston rods of the main jack 5 are fixed at the circle center positions of the loading disc 7, at least three auxiliary jacks 6 are arranged on the periphery of the main jack 5, cylinder bodies of the auxiliary jacks 6 are fixed on the cross beam 3, piston rods of the auxiliary jacks 6 are connected with the upper surface of the loading disc 7, and connection points of the piston rods of the auxiliary jacks 6 and the loading disc 7 are located on the same circumference with the piston rods of the main jack 5 as the circle center and are uniformly distributed.
Furthermore, the oil-saving type oil-water separator further comprises an oil tank 8 and an oil pump 9, wherein the oil pump is connected with the oil tank 8 through a pipeline, the oil pump is also connected with a main jack 5 through a main top oil supply pipe 5-1, a main top oil inlet control valve 10 is installed on the main top oil supply pipe 5-1, the oil tank 8 is connected with the main jack 5 through a main top oil return pipe 5-2, and a main top oil return control valve 11 is installed on the main top oil return pipe 5-2; the oil tank 8 is also respectively connected with an auxiliary top oil supply pipe 6-1 and an auxiliary top oil return pipe 6-2, the auxiliary top oil supply pipe 6-1 and the auxiliary top oil return pipe 6-2 are respectively connected with each auxiliary jack 6 through a branch pipe, an auxiliary top oil inlet one-way valve 12 is installed on the auxiliary top oil supply pipe 6-1, and an auxiliary top oil return control valve 13 is installed on the auxiliary top oil return pipe 6-2; a pipeline is connected between the main top oil supply pipe 5-1 and the auxiliary top oil supply pipe 6-1, and a pressure control valve 14 is installed on the pipeline.
The utility model discloses the advantage: 1. the loading device for the prior similar technology is improved, a horizontal loading disc is adopted to vertically apply static load to the test foundation pile for experiment, and meanwhile, auxiliary jacks arranged around a main jack are simultaneously loaded at the same pressure, so that the pressure on the test foundation pile is kept, the pile foundation is stressed stably and balanced, and the accuracy of experiment data is ensured.
2. The hydraulic oil supply pipeline is improved aiming at the prior similar technology, the hydraulic oil supply pipeline which can drive the main jack and the auxiliary jack to work simultaneously is adopted to provide static pressure for the loading disc, and meanwhile, the loading disc can be continuously loaded, the operation is convenient, the loading disc is protected to accept balance, and the reliability of the work is improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the structure of the oil supply pipeline of the present invention;
FIG. 3 is a schematic diagram of a loading experiment implemented by a single jack in the background art;
FIG. 4 is a schematic diagram of an embodiment implementing a balanced loading experiment.
The symbols in the drawings illustrate that: the device comprises a test foundation pile 1, a bearing platform base 2, a cross beam 3, a bearing block 4, a main jack 5, a main jacking oil supply pipe 5-1, a main jacking oil return pipe 5-2, an auxiliary jack 6, an auxiliary jacking oil supply pipe 6-1, an auxiliary jacking oil return pipe 6-2, a loading disc 7, an oil tank 8, an oil pump 9, a main jacking oil inlet control valve 10, a main jacking oil return control valve 11, an auxiliary jacking oil inlet one-way valve 12, an auxiliary jacking oil return control valve 13, a pressurizing control valve 14, a displacement sensor 15 and a reference point position sensor 16.
Detailed Description
The present invention will be described in detail with reference to the preferred embodiments.
As shown in fig. 1, 2 and 4, the building foundation pile strength detection experimental device comprises a test foundation pile 1, a bearing platform seat 2, a cross beam 3, a bearing block 4 and a main jack 5, wherein the bearing platform seat 2 is arranged on the left side and the right side of the test foundation pile 1, the cross beam 3 is arranged at the top end of the bearing platform seat 2, and the main jack 5 is arranged in the center position on the cross beam 3; and a bearing block 4 is arranged above the cross beam 3, and the weight of the bearing block 4 ensures that the acting force of the test foundation pile 1 is completely applied to the test foundation pile 1. The device is characterized by further comprising a loading disc 7 and auxiliary jacks 6, wherein the loading disc 7 is arranged under the main jack 5, piston rods of the main jack 5 are fixed at the circle center positions of the loading disc 7, at least three auxiliary jacks 6 are arranged on the periphery of the main jack 5, cylinder bodies of the auxiliary jacks 6 are fixed on the cross beam 3, piston rods of the auxiliary jacks 6 are connected with the upper surface of the loading disc 7, and connection points of the piston rods of the auxiliary jacks 6 and the loading disc 7 are located on the same circumference with the piston rods of the main jack 5 as the circle center and are uniformly distributed.
During operation, the levelness of the loading disc 7 is measured through a level meter and the like, so that the loading disc 7 is kept horizontal, the loading disc descends and vertically applies static load to the test foundation pile 1 for experiment, and meanwhile, the auxiliary jacks 6 around the main jack 5 are simultaneously loaded under the same pressure, so that the pressure on the test foundation pile 1 is kept, the pile foundation is stressed stably, and the accuracy of experimental data is ensured.
The loading plate 7 is provided with a displacement sensor 15, a reference pile may be provided, and a reference position sensor or a magnetic base may be attached, or a reference position sensor or a magnetic base may be attached to the pedestal 2. The testing device records the displacement data of the pile foundation to be tested in the test through the displacement sensor 15, judges whether the vertical bearing capacity of the foundation pile to be tested is qualified or not according to the displacement data, and can also adopt a precise dial indicator.
The utility model discloses still including the hydraulic pressure that drives the work of main jack 5 and vice jack 6 and supply oil pipe way, this hydraulic means includes oil tank 8 and oil pump 9, and the oil pump passes through pipeline connection oil tank 8, and the oil pump still supplies oil pipe 5-1 through main top and connects main jack 5, installs main top oil inlet control valve 10 on the main top oil pipe 5-1, and oil tank 8 returns oil pipe 5-2 through main top and connects main jack 5, and main top returns oil control valve 11 of installation on the oil pipe 5-2 returns oil pipe 5-2 of main top.
The oil tank 8 is also respectively connected with an auxiliary top oil supply pipe 6-1 and an auxiliary top oil return pipe 6-2, the auxiliary top oil supply pipe 6-1 and the auxiliary top oil return pipe 6-2 are respectively connected with each auxiliary jack 6 through a branch pipe, an auxiliary top oil inlet one-way valve 12 for supplying oil to the auxiliary jack 6 is arranged on the auxiliary top oil supply pipe 6-1, and an auxiliary top oil return control valve 13 for controlling oil return is arranged on the auxiliary top oil return pipe 6-2. And a pipeline is connected between the main jacking oil supply pipe 5-1 and the auxiliary jacking oil supply pipe 6-1, two connecting points of the pipeline are respectively positioned behind the auxiliary jacking oil check valve 12 and in front of the main jacking oil control valve 10, and a pressure control valve 14 is arranged on the pipeline.
The working process is as follows:
the loading preparation process comprises the following steps: when the test device works, the oil pump 9 is started, the main jack oil return control valve 11 is started to supply oil to the main jack 5, and the piston rod of the main jack 5 moves downwards to the upper end of the test foundation pile 1; in the process, the piston rod of the auxiliary jack 6 moves downwards passively, the auxiliary jacking oil inlet one-way valve 12 on the auxiliary jacking oil supply pipe 6-1 connected with the auxiliary jack 6 is opened, and oil is sucked from the oil tank 8 into the auxiliary jack 6.
(II) a load maintaining process: and (3) opening the pressurizing control valve 14, simultaneously supplying oil to the main jack 5 and the auxiliary jack 6 by the oil pump 9 through the main jack oil inlet control valve 10 and the pressurizing control valve 14, and closing the auxiliary jack oil inlet one-way valve 12 by increasing the oil pressure in the auxiliary jack. All the auxiliary jacks 6 are supplied with oil through a set of pipelines, so that the oil supply pressure is the same, and the loading disc 7 can be kept in a balanced loading state. The oil pump 9 adopts a frequency conversion technology, and the increase of the next stage load is realized by increasing the power of the oil pump 9.
(III) unloading process: and (3) closing the main jack oil inlet control valve 10 and the pressurization control valve 14, opening the main jack oil return control valve 11 and the auxiliary jack oil return control valve 13, enabling the main jack 5 and the auxiliary jack 6 to flow into the oil return tank 8 to achieve unloading, and installing the oil tank on the ground to achieve smooth oil return. After unloading, the experiment of the test foundation pile 1 is completed, and the whole equipment can be disassembled.
Claims (2)
1. The building foundation pile strength detection experimental device comprises a test foundation pile (1), a bearing platform seat (2), a cross beam (3), a bearing block (4) and a main jack (5), wherein the bearing platform seat (2) is arranged on the left side and the right side of the test foundation pile (1), the cross beam (3) is arranged at the top end of the bearing platform seat (2), and the main jack (5) is arranged in the center position on the cross beam (3); the device is characterized by further comprising a loading disc (7) and auxiliary jacks (6), wherein the loading disc (7) is arranged under the main jack (5), a piston rod of the main jack (5) is fixed at the circle center position of the loading disc (7), at least three auxiliary jacks (6) are arranged on the periphery of the main jack (5), a cylinder body of each auxiliary jack (6) is fixed on the cross beam (3), a piston rod of each auxiliary jack (6) is connected with the upper surface of the loading disc (7), and connection points of the piston rods of the auxiliary jacks (6) and the loading disc (7) are located on the same circumference with the piston rod of the main jack (5) as the circle center and are uniformly distributed.
2. The building foundation pile strength detection experimental device according to claim 1, further comprising an oil tank (8) and an oil pump (9), wherein the oil pump is connected with the oil tank (8) through a pipeline, the oil pump is further connected with the main jack (5) through a main top oil supply pipe (5-1), a main top oil inlet control valve (10) is installed on the main top oil supply pipe (5-1), the oil tank (8) is connected with the main jack (5) through a main top oil return pipe (5-2), and the main top oil return control valve (11) is installed on the main top oil return pipe (5-2);
the oil tank (8) is also respectively connected with an auxiliary top oil supply pipe (6-1) and an auxiliary top oil return pipe (6-2), the auxiliary top oil supply pipe (6-1) and the auxiliary top oil return pipe (6-2) are respectively connected with each auxiliary jack (6) through a branch pipe, an auxiliary top oil inlet check valve (12) is installed on the auxiliary top oil supply pipe (6-1), and an auxiliary top oil return control valve (13) is installed on the auxiliary top oil return pipe (6-2);
a pipeline is connected between the main top oil supply pipe (5-1) and the auxiliary top oil supply pipe (6-1), and a pressure control valve (14) is installed on the pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222462981.4U CN218444904U (en) | 2022-09-18 | 2022-09-18 | Building foundation pile strength detection experimental device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222462981.4U CN218444904U (en) | 2022-09-18 | 2022-09-18 | Building foundation pile strength detection experimental device |
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| Publication Number | Publication Date |
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| CN218444904U true CN218444904U (en) | 2023-02-03 |
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| CN202222462981.4U Active CN218444904U (en) | 2022-09-18 | 2022-09-18 | Building foundation pile strength detection experimental device |
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- 2022-09-18 CN CN202222462981.4U patent/CN218444904U/en active Active
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