CN215406206U - Diameter-variable test model pile end resistance tester - Google Patents
Diameter-variable test model pile end resistance tester Download PDFInfo
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- CN215406206U CN215406206U CN202121114212.4U CN202121114212U CN215406206U CN 215406206 U CN215406206 U CN 215406206U CN 202121114212 U CN202121114212 U CN 202121114212U CN 215406206 U CN215406206 U CN 215406206U
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Abstract
The utility model provides a diameter-variable test model pile end resistance tester, belongs to the technical field of geotechnical engineering, and is used for solving the technical problem that the existing pile end resistance testing device cannot accurately test the pile end resistance of test piles with different diameter models. Including lower loading board, pressure sensor, go up loading board and aluminium system fixed plate, pressure sensor sets up under between loading board and the last loading board, and the aluminium system fixed plate sets up the up end at last loading board, has seted up the spring sliding tray on the last loading board, installs the spring in the spring sliding tray, and the tip of spring is provided with the buckle, and the aluminium system fixed plate is connected with the buckle, and the aluminium system fixed plate can be along the radial removal of spring sliding tray, and the inboard rectangular foil formula foil strain gauge that pastes of aluminium system fixed plate. The position of aluminium system fixed plate is adjusted through the spring sliding tray, makes its stake end resistance test that can satisfy different diameter test model piles, and is not fragile, repeatedly usable, and application range is wide, has good economic nature, and the measuring result degree of accuracy is high.
Description
Technical Field
The utility model belongs to the technical field of geotechnical engineering, and particularly relates to a diameter-variable test model pile tip resistance tester.
Background
In the technical field of geotechnical engineering, the measurement of pile end pressure is always a main standard for measuring the strength of a pile body.
With the development of scientific technology in the geotechnical field, engineering is continuously developed to higher quality, the requirement on the strength of a pile body is continuously improved, but when an optimized pile model is designed and the resistance of a pile end is tested, a traditional strain test method is adopted, namely a strain gauge is adhered to concrete on the surface or the surface of an organic glass pile body. In an indoor model test, the test of the pile end resistance is generally realized by strain gauges arranged on a pile body, strain values of all sections of the pile body are obtained by connecting strain testers, and then the pile end resistance is obtained through conversion. In the existing testing mode, the strain gauge is easy to damage, so that the testing result is influenced, and the measuring result is inaccurate.
Adopt the main shortcoming of testing laboratory model stake end resistance of traditional mode to have: for some small-radius piles and some club-footed piles with overlarge pile end radius, because the mutual contact is unstable due to the fact that the radius of the pile end is not matched with the radius of a pressure tester, the contact area is not the actual effective area of the pile end, and the phenomenon that the pile end is not full-section bearing is shown, so that the difference exists between the measurement result and the actual working condition of the pile foundation. Secondly, in some gravel soil foundations, small-particle-size gravel is easily doped on the contact surface of the tester and the pile end to pad the pile, so that the axis of the pile deviates from the normal direction. And thirdly, when the pile is buried in the soil, because the pile end is positioned at a deeper position of the earth surface, the traditional model pile adopts a concrete surface to paste a strain gauge, so that the traditional model pile is easily corroded by underground water, and the resistance strain gauge arranged on the outer side of the precast concrete pile is easily damaged in filling. Due to various defects, the accuracy of data acquired by tests is low, and the uniformity of the data measured by the same set of instruments for multiple times in the same set of tests is poor.
Therefore, a tester for testing the pile-end resistance of the model pile, which has a variable diameter, is not easy to damage and can be reused, needs to be designed to accurately measure the pile-end resistance of the model pile.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the problems in the prior art, and provides a diameter-variable test model pile end resistance tester, which aims to solve the technical problems that: how to realize the measurement of the pile end resistance of the test model piles with different diameters.
The purpose of the utility model can be realized by the following technical scheme:
the utility model provides a changeable test model pile tip resistance tester of diameter, including lower loading board, pressure sensor, go up loading board and a plurality of aluminium system fixed plate, pressure sensor sets up under between loading board and the last loading board, the aluminium system fixed plate sets up the up end at last loading board, a plurality of spring sliding tray have been seted up on the last loading board, install the spring in the spring sliding tray, the tip of spring is provided with the buckle, the aluminium system fixed plate is connected with the buckle, the aluminium system fixed plate can be along the radial removal of spring sliding tray, the inboard rectangular foil formula foil gage that pastes of aluminium system fixed plate.
Four spring sliding grooves are formed in the upper bearing plate, the number of the aluminum fixing plates is four, each spring sliding groove is correspondingly provided with one aluminum fixing plate, and the four aluminum fixing plates are uniformly distributed on the upper bearing plate.
The one end welded fastening of spring is on the inner wall of spring sliding tray, and the other end and the buckle welding of spring, the size of spring sliding tray are greater than the diameter of spring, guarantee that the spring can slide in the spring sliding tray, and the spring adopts the great spring of coefficient of stiffness to guarantee to be closely laminated by compressed back aluminium system fixed plate and test stake.
The spring sliding groove can be internally oiled, so that the sliding of the buckle is facilitated.
The cylindrical pile is tested, the cross section of the pile end is circular, the adopted aluminum fixing plate is arc-shaped, and the aluminum fixing plate can be set to be quarter circular according to the diameter of the cylindrical pile, so that the aluminum fixing plate is tightly attached to the pile end face.
The cylindrical pile is tested, the cross section of the pile end is square, and the aluminum fixing plate is arranged in a horseshoe shape, so that the fitting degree of the connecting surface is guaranteed.
The aluminum fixing plate is fixed on the buckle in a welding mode, the inner side of the aluminum fixing plate is pasted with the strip foil type strain gauge, and epoxy resin is smeared on the surface of the strain gauge for protection after the strain gauge is pasted.
The centers of the lower bearing plate, the pressure sensor and the upper bearing plate are located on the same axis, and the accuracy of measuring data of the pressure sensor is improved.
The pressure sensor is connected with the upper bearing plate and the lower bearing plate through high-strength bolts, the upper end face and the lower end face of the pressure sensor are provided with the high-strength bolts, and the lower end face of the upper bearing plate and the upper end face of the lower bearing plate are provided with threaded holes connected with the high-strength bolts; the upper bearing plate and the lower bearing plate are fixed together through high-strength bolts and pressure sensors to form a stable structure.
The pressure sensor is preferably a column type wireless pull pressure sensor, and the model is ZNLBM pull pressure sensor.
Preferably, the radius of the upper bearing plate and the radius of the lower bearing plate are the same as or larger than the radius of the pressure sensor, the side surface of the pressure sensor is provided with a wiring hole, and the lead of the pressure sensor is directly led out along the circumferential radial direction of the lead.
Preferably, the upper bearing plate and the lower bearing plate are both made of Q40 high-strength steel plates.
Compared with the prior art, the diameter-variable test model pile end resistance tester has the following advantages:
1. the utility model provides a diameter-variable test model pile end resistance tester, which adopts an aluminum fixing plate capable of sliding along a spring sliding groove to fix a pile body, and adjusts a telescopic spring to adapt to piles of different sizes, so that the radius of a pile end is matched with the measuring radius of the resistance tester and the contact is kept stable, the contact area is close to the actual effective area of the pile end, the full-section bearing is shown, and the measurement error of the pile end resistance caused by the contact area error is effectively reduced.
2. This stake end resistance tester pastes the foil gage on through aluminium system fixed plate, marks the deformation when being connected the initial with the stake end, thereby later corresponds variable data analysis in the experiment loading process and can judge whether the pile axis deviates from the normal direction to obtain accurate test pile shaft power data, guarantee the accuracy of stake end resistance data.
3. The pile end pressure tester is easy to mount and dismount, can be used for testing the pile end resistance of test model piles with different diameters, is convenient to use and high in applicability, and improves the pile end pressure testing precision; the pile testing device is not easy to damage, can be repeatedly used, is low in cost, and is convenient for testing and using the geotechnical engineering laboratory test model pile.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic disassembled view of the present invention;
in the figure: 1-lower bearing plate, 11-bolt hole, 2-pressure sensor, 21-wiring hole, 3-upper bearing plate, 31-spring sliding groove, 4-spring, 5-buckle, 6-aluminum fixing plate and 7-high-strength bolt.
Detailed Description
The technical solution of the present patent will be described in further detail with reference to the following embodiments.
Reference will now be made in detail to embodiments of the present patent, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present patent and are not to be construed as limiting the present patent.
In the description of this patent, it is to be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for the convenience of describing the patent and for the simplicity of description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the patent.
In the description of this patent, it is noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "disposed" are to be construed broadly and can include, for example, fixedly connected, disposed, detachably connected, disposed, or integrally connected and disposed. The specific meaning of the above terms in this patent may be understood by those of ordinary skill in the art as appropriate.
Referring to fig. 1-2, the present embodiment provides a diameter-variable test model pile end resistance tester, which includes a lower bearing plate 1, a pressure sensor 2, an upper bearing plate 3, and a plurality of aluminum fixing plates 6, wherein the pressure sensor 2 is disposed between the lower bearing plate 1 and the upper bearing plate 3, the aluminum fixing plates 6 are disposed on the upper end surface of the upper bearing plate 3, the upper bearing plate 3 is provided with a plurality of spring sliding grooves 31, springs 4 are installed in the spring sliding grooves 31, end portions of the springs 4 are provided with buckles 5, the aluminum fixing plates 6 are connected with the buckles 5, the aluminum fixing plates 6 can move along the spring sliding grooves 31 in the radial direction, and the inner sides of the aluminum fixing plates 6 are adhered with strip foil type strain gauges.
In this embodiment, four spring sliding grooves 31 are formed in the upper bearing plate 3, the number of the aluminum fixing plates 6 is four, each spring sliding groove 31 is correspondingly provided with one aluminum fixing plate 6, and the four aluminum fixing plates 6 are uniformly distributed on the upper bearing plate 3.
Spring 4's one end welded fastening is on the inner wall of spring sliding tray 31, and spring 4's the other end and 5 welding of buckle, and spring sliding tray 31's size is greater than spring 4's diameter, guarantees that spring 4 can slide in spring sliding tray 31, and spring 4 adopts the great spring of the coefficient of stiffness to guarantee that aluminium system fixed plate 6 is closely laminated with the test stake after being compressed.
In this embodiment, the spring sliding groove 31 can be oiled, which is beneficial to the sliding of the buckle 5.
In this embodiment, a cylindrical pile is tested, the cross section of the pile end is circular, and the aluminum fixing plate 6 is arc-shaped and can be set to be quarter circular according to the diameter of the cylindrical pile, so that the aluminum fixing plate 6 is tightly attached to the pile end surface.
If square pile is measured, the cross section of the pile end is square, and the aluminum fixing plate 6 is in a horseshoe shape, so that the attaching degree of the connecting surface is guaranteed.
The aluminum fixing plate 6 is fixed on the buckle 5 by welding, the inner side of the aluminum fixing plate 6 is pasted with a strip foil type strain gauge, and the surface of the strain gauge is coated with epoxy resin for protection after the strain gauge is pasted.
The centers of the lower bearing plate 1, the pressure sensor 2 and the upper bearing plate 3 are located on the same axis, so that the accuracy of the data measured by the pressure sensor 2 is improved.
The pressure sensor 2 is connected with the upper bearing plate 3 and the lower bearing plate 1 through high-strength bolts 7, the upper end face and the lower end face of the pressure sensor 2 are provided with the high-strength bolts 7, and the lower end face of the upper bearing plate 3 and the upper end face of the lower bearing plate 1 are provided with threaded holes 11 connected with the high-strength bolts 7; the upper bearing plate and the lower bearing plate are fixed together through the high-strength bolt 7 and the pressure sensor 2 to form a stable structure.
The pressure sensor 2 is preferably a column type wireless pull pressure sensor with model number ZNLBM pull pressure sensor.
Preferably, the radius of the upper bearing plate 3 and the radius of the lower bearing plate 1 are the same as or larger than the radius of the pressure sensor 2, the side of the pressure sensor 2 is provided with a wiring hole 21, and the lead of the pressure sensor 2 is directly led out along the circumference radial direction.
Preferably, the upper bearing plate 3 and the lower bearing plate 1 are both made of Q40 high-strength steel plate.
The working principle of the utility model is as follows:
the utility model provides a changeable test model stake end resistance tester of diameter, through the position that changes aluminium system fixed plate 6, makes its stake end resistance that can satisfy the test model stake of different diameters test, has exerted the effective area of stake end completely, has improved measurement accuracy simultaneously, closely laminates with the pile surface after pasting the foil gage on aluminium system fixed plate 6, has guaranteed that the stake axis is in vertical direction, has protected the foil gage on the pile concrete surface simultaneously, has improved measurement accuracy.
When the club-footed model pile is measured, the clamping radius of the aluminum fixing plate 6 can be enlarged by moving the buckle 5 in the upper bearing plate 3, so that the aluminum fixing plate 6 is tightly attached to the surface of the pile, the strain gauges on the aluminum fixing plate 6 are uniformly distributed on the surface of the pile, and after the pile is stably installed, the existing data of the strain gauges are cleared. When the pile body is loaded in a grading manner, data are required to be recorded at each grade, the reading of the strain gauge and the reading of the pressure sensor 2 are recorded at the same time, whether the amplitude of the data image of the strain gauge is changed excessively or not is observed, and if sudden change occurs, the loading is stopped to check the test model structure.
When the small-radius model pile is measured, after the model pile is installed, the pile end is fixed in the middle of four aluminum fixing plates 6, at the moment, the joint position of strain gauges on the inner side of each aluminum fixing plate 6 is bonded from dense to sparse from two ends to the center axis, the pressure sensor 2, the upper bearing plate 3 and the lower bearing plate 2 are connected through high-strength bolts, the pile end is placed on the top surface of the upper bearing plate 3, the pile is loaded in a grading manner, and axial force test data and strain data are obtained through the pressure sensor 2 and the strain gauges of the aluminum fixing plates 6; according to the size of the model pile, a spring with proper stiffness coefficient is selected in a certain range, and the size of the aluminum fixing plate 6 is set so as to more accurately test pile end resistance data.
The utility model provides a diameter-variable test model pile end resistance tester, which adopts an aluminum fixing plate 6 capable of sliding along a spring sliding groove 31 to fix a pile body, and adjusts a telescopic spring to adapt to piles of different sizes, so that the radius of the pile end is matched with the measuring radius of the resistance tester and the contact is kept stable, the contact area is close to the actual effective area of the pile end, the full-section bearing is shown, and the pile end resistance measuring error caused by the contact area error is effectively reduced; the strain gauge is adhered to the aluminum fixing plate 6, the strain is calibrated when the aluminum fixing plate is initially connected with the pile end, and then corresponding variable data are analyzed in the experimental loading process so as to judge whether the pile axis deviates from the normal direction, so that accurate test pile body axial force data are obtained, and the accuracy of pile end resistance data is ensured; meanwhile, the test model pile end resistance tester provided by the utility model is easy to install and disassemble, can be used for testing the pile end resistance of test model piles with different diameters, is convenient to use and strong in applicability, and improves the pile end resistance testing precision; the pile testing device is not easy to damage, can be repeatedly used, is low in cost, and is convenient for testing and using the geotechnical engineering laboratory test model pile.
Although the preferred embodiments of the present patent have been described in detail, the present patent is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present patent within the knowledge of those skilled in the art.
Claims (9)
1. The utility model provides a changeable test model pile tip resistance tester of diameter, includes loading board (1) down, pressure sensor (2), goes up loading board (3) and a plurality of aluminium system fixed plate (6), a serial communication port, pressure sensor (2) set up under between loading board (1) and last loading board (3), aluminium system fixed plate (6) set up the up end at last loading board (3), go up and seted up a plurality of spring sliding tray (31) on loading board (3), install spring (4) in spring sliding tray (31), the tip of spring (4) is provided with buckle (5), aluminium system fixed plate (6) are connected with aluminium system fixed plate (6) through buckle (5), aluminium system fixed plate (6) can be along spring sliding tray (31) along radial movement, aluminium system fixed plate (6) inboard has pasted rectangular foil formula foil gage.
2. The diameter-variable test model pile tip resistance tester as claimed in claim 1, wherein the upper bearing plate (3) is provided with four spring sliding grooves (31), the number of the aluminum fixing plates (6) is four, each spring sliding groove (31) is correspondingly provided with one aluminum fixing plate (6), and the four aluminum fixing plates (6) are uniformly distributed on the upper bearing plate (3); one end of the spring (4) is welded and fixed on the inner wall of the spring sliding groove (31), and the other end of the spring (4) is welded with the buckle (5).
3. The diameter-variable test model pile tip resistance tester as claimed in claim 2, wherein the pile tip cross-section is circular and the aluminum fixing plate (6) is arc-shaped.
4. The diameter-variable test model pile end resistance tester as claimed in claim 2, wherein the pile end cross-section is square, and the aluminum fixing plate (6) is horseshoe-shaped.
5. The pile tip resistance tester of the test model with the variable diameter as claimed in claim 2, wherein the aluminum fixing plate (6) is fixed on the buckle (5) by welding, and epoxy resin is coated on the surface of the aluminum fixing plate (6) after the strain gauge on the inner side is adhered.
6. The diameter-variable test model pile tip resistance tester as claimed in claim 1 or 2, characterized in that the centers of the lower bearing plate (1), the pressure sensor (2) and the upper bearing plate (3) are located on the same axis.
7. The diameter-variable test model pile tip resistance tester as claimed in claim 6, wherein the pressure sensor (2) is connected with the upper bearing plate (3) and the lower bearing plate (1) through high-strength bolts (7), the upper end face and the lower end face of the pressure sensor (2) are provided with the high-strength bolts (7), and the lower end face of the upper bearing plate (3) and the upper end face of the lower bearing plate (1) are provided with threaded holes (11) connected with the high-strength bolts (7).
8. The diameter-variable test model pile tip resistance tester as claimed in claim 7, wherein the pressure sensor (2) is a column type wireless tension pressure sensor.
9. The diameter-variable test model pile tip resistance tester as claimed in claim 1, wherein the upper bearing plate (3) and the lower bearing plate (1) are both made of Q40 high-strength steel plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121114212.4U CN215406206U (en) | 2021-05-24 | 2021-05-24 | Diameter-variable test model pile end resistance tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121114212.4U CN215406206U (en) | 2021-05-24 | 2021-05-24 | Diameter-variable test model pile end resistance tester |
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| Publication Number | Publication Date |
|---|---|
| CN215406206U true CN215406206U (en) | 2022-01-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121114212.4U Active CN215406206U (en) | 2021-05-24 | 2021-05-24 | Diameter-variable test model pile end resistance tester |
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| CN (1) | CN215406206U (en) |
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2021
- 2021-05-24 CN CN202121114212.4U patent/CN215406206U/en active Active
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