CN113932697A - Sensor positioning tool and displacement measurement method for focus of geotechnical experiment pile body - Google Patents
Sensor positioning tool and displacement measurement method for focus of geotechnical experiment pile body Download PDFInfo
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- CN113932697A CN113932697A CN202111029493.8A CN202111029493A CN113932697A CN 113932697 A CN113932697 A CN 113932697A CN 202111029493 A CN202111029493 A CN 202111029493A CN 113932697 A CN113932697 A CN 113932697A
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- 238000006073 displacement reaction Methods 0.000 title claims abstract description 42
- 238000002474 experimental method Methods 0.000 title claims description 36
- 238000000691 measurement method Methods 0.000 title abstract description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 11
- 239000010959 steel Substances 0.000 claims description 11
- 239000002689 soil Substances 0.000 claims description 8
- 238000005520 cutting process Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 238000009933 burial Methods 0.000 claims description 4
- 238000009826 distribution Methods 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 238000011160 research Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract 1
- WSNMPAVSZJSIMT-UHFFFAOYSA-N COc1c(C)c2COC(=O)c2c(O)c1CC(O)C1(C)CCC(=O)O1 Chemical compound COc1c(C)c2COC(=O)c2c(O)c1CC(O)C1(C)CCC(=O)O1 WSNMPAVSZJSIMT-UHFFFAOYSA-N 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a sensor positioning tool and a displacement measurement method for a focus point of a geotechnical test pile body, relates to the field of displacement sensor fixing devices of geotechnical tests, and solves the problems that the displacement of different positions of the pile body is difficult to measure in geotechnical model tests. The technical scheme is characterized by comprising a model box, a fixing frame, supporting legs, a vertical height adjusting assembly and a horizontal adjusting assembly, wherein the model box provides a fixing platform for the supporting legs of the base; the vertical height adjusting assembly comprises a movable support and a fixing nut, and the horizontal height adjusting assembly is connected with the fixing frame through bolts. The technical effect is that the specific position of the displacement sensor is adjusted through the vertical height adjusting assembly and the horizontal adjusting assembly so as to adapt to different pile diameters, different pile lengths and different experimental test requirements.
Description
Technical Field
The invention relates to the field of geotechnical test equipment, in particular to a sensor positioning tool and a displacement measurement method of a point to be measured.
Background
An LVDT displacement sensor is a full-scale linear variable differential transformer and belongs to a linear displacement sensor. The working principle is simply that of a movable iron core transformer. The device consists of a primary coil, two secondary coils, an iron core, a coil framework, a shell and the like, and is widely applied to displacement measurement of geotechnical experiment objects. However, manufacturers only provide cutting sleeves for fixing the LVDT and do not provide corresponding clamps, most of objects tested by the LVDT in the geotechnical experiment are special-shaped components, and in order to measure the displacement deformation condition of the concerned point, the support which is flexible in adjustment in all directions, stable in fixation and strong in adaptability to different working conditions is needed. The existing support is simple in structure, low in degree of freedom and single in adaptive experimental working condition.
Disclosure of Invention
The invention aims to provide a sensor positioning tool which has the functions of fixing and adjusting the position of an LVDT (linear variable differential transformer), fixing the position of the LVDT according to different experimental requirements, measuring the displacement deformation condition of a concerned point and further analyzing an experimental result.
The technical purpose of the invention is realized by the following technical scheme:
a sensor positioning tool: comprises a model box, a fixed frame with the center for placing a piece to be tested, and supporting legs for connecting the model box and the fixed frame;
the fixing frame is provided with a plurality of stations for installing the LVDT displacement sensors on the outer ring of the to-be-detected piece in a surrounding mode, and the fixing frame is provided with a horizontal adjusting assembly and a vertical height adjusting assembly, wherein the linkage stations move along the to-be-detected piece in the opposite direction, and the vertical height adjusting assembly drives the horizontal adjusting assembly to move up and down.
By adopting the technical scheme, in an experiment, the horizontal position of the displacement sensor is adjusted by adjusting the horizontal adjusting assembly, and the vertical position of the displacement sensor is adjusted by matching with the vertical height adjusting assembly to measure the displacement conditions of measuring points at different positions; the linkage station on the fixing frame can simultaneously measure the displacement conditions of different positions of the piece to be measured in the experiment.
Further setting: the vertical height adjusting assembly comprises a moving support, a bracket connected to the fixed frame in a sliding mode, a sliding groove for sliding of the bracket on the fixed frame, and a locking structure I for limiting the movement of the bracket.
By adopting the technical scheme, the movable support can slide up and down to the required height along the supporting leg sliding groove in the experiment so as to adapt to measuring pieces with different burial depths and deeper soil layer depths; meanwhile, the vertical position of the bracket can be adjusted on the fixing frame, and the bracket is locked by the first locking structure after being adjusted to the height required by the experiment.
Further setting: the locking structure I comprises a bolt, a positioning plate and a fixing nut, wherein the fixing bolt penetrates through the positioning plate and the fixing frame and is locked with the bracket through the fixing nut.
Through adopting above-mentioned technical scheme, the locating plate passes through bolt and fixation nut in the mount locking, has very high intensity, rigidity and stability, has guaranteed in the experiment that the condition influence experiment accuracy such as locking point is not hard up can not take place.
Further setting: the horizontal adjusting assembly comprises a sliding frame which is connected to the bracket in a sliding mode, a locking structure II for locking the position of the sliding frame and a sleeve ring.
By adopting the technical scheme, the sliding frame can horizontally slide on the bracket sliding groove to be adjusted to a proper position and is locked by the locking structure II; the lantern ring is used for fixed LVDT displacement sensor position, prevents that the displacement sensor from appearing sliding in the experiment and influencing the experimental result.
Further setting: the second locking structure comprises a pentagonal flange nut and a pentagonal bolt, wherein the pentagonal flange nut penetrates through the cutting grooves of the bracket and the sliding frame and is locked with the bracket through the pentagonal flange nut.
Through adopting above-mentioned technical scheme, the grooving that pentagonal flange nut passed bracket and carriage passes through pentagonal flange nut and bracket locking, has very high intensity, rigidity and stability in the experiment, has avoided taking place to become flexible in the experiment and has influenced the experimental result.
Further setting: the bracket and the sliding frame are channel steels; the movable support is a channel steel; the supporting legs are L-shaped channel steel, and the lower end parts of the supporting legs are connected with the bottom plate of the model box through bolts.
By adopting the technical scheme, the channel steel has high strength, is not easy to deform, reduces the whole weight of the device and is convenient to carry and store; the lower end parts of the supporting legs are connected with the bottom plate of the model box through bolts, so that the supporting legs are firmly connected with the model box and are not loosened during an experiment.
Further setting: the mount includes the apical ring, and the vertical stand of a plurality of that the end ring was arranged is followed to the end ring, and the bracket slides and is connected to this vertical stand on, and apical ring and end ring are through sliding locking structure sliding connection to vertical stand on, and sliding locking structure includes the lantern ring and lock nut.
By adopting the technical scheme, the vertical upright posts are connected with the top ring and the bottom ring in a sliding manner, so that the device has strong flexibility; the position of being convenient for adjust vertical stand before the experiment begins between top ring and end ring and locking in order to adapt to more complicated experimental operating mode, a plurality of vertical stand is located different position, can record the displacement condition of the different positions of piece that awaits measuring simultaneously in the experiment, and the experimental operating mode who is suitable for is wide.
Further setting: the bottom ring is provided with a level gauge.
By adopting the technical scheme, the gradienter can judge whether the device is inclined or not in the test, and if the device is inclined, the heights of the supporting legs at different positions are adjusted in time to restore the level of the device.
Further setting: the supporting legs are connected with the bottom plate of the model box through bolts, and the bottom plate of the model box is provided with a plurality of bolt positioning holes.
Through adopting above-mentioned technical scheme, can adjust the position of supporting legs according to the experiment needs, adapt to more experiment operating modes.
The invention aims to provide a displacement measurement method for a pile body focus point of a geotechnical experiment, which can measure the displacement conditions of a plurality of different focus points in the experiment, and further can process different data of points to be measured, and provides a pile foundation optimization design method.
The technical purpose of the invention is realized by the following technical scheme:
a method for measuring displacement of a point of interest of a geotechnical experiment pile body is characterized by comprising the following steps:
s1, preparation phase
S1.1, determining experimental working conditions such as distribution of different types of soil layers, burial depth of a piece to be tested and the like according to research needs;
s1.2, debugging and calibrating the LVDT displacement sensor, and pre-installing the LVDT displacement sensor on the sliding frame.
S2, experimental stage
S2.1, positioning and installing supporting legs on a bottom plate of the model box;
s2.2, filling soil in the model box layer by layer and tamping to a preset height, adjusting the fixing frame to a proper position through the movable support, adjusting the vertical upright post to the preset position and then locking, observing the level gauge and ensuring the level of the device;
s2.3, positioning and arranging a piece to be detected at the center of the fixing frame;
s2.4, adjusting the brackets on the vertical upright post sliding grooves of the fixing frames to the required height, adjusting the horizontal position of the sliding frame, and locking the sliding frame through a locking structure after the adjustment is finished.
S2.5, connecting the displacement sensor with a data acquisition instrument;
s2.6 starts loading.
S4 end stage
And S4.1, processing the data acquired by the data acquisition instrument after the loading is finished.
In conclusion, the invention has the following beneficial effects:
1. the vertical height adjusting assembly and the horizontal adjusting assembly realize two-way adjustment of the vertical position and the horizontal position of the LVDT, and displacement deformation measurement of various experimental object focus points can be realized; the arrangement of a plurality of linkage stations can measure the displacement conditions of different positions of the piece to be detected simultaneously in the test, and the displacement detection is carried out on the attention point of the piece to be detected in an all-round mode.
2. The supporting legs and the movable support are connected through the detachable locking structure, the positioning plate and the bracket are connected through the detachable locking structure, and the positioning plate and the bracket can be detached after the experiment is completed, so that the positioning plate is convenient to place and store.
3. The model box, the supporting legs, the movable support and the fixed frame are firmly connected, so that the position is prevented from relative dislocation in the experiment, and the accuracy of the experiment is improved; the supporting legs can adjust the position at the bottom of the model box, and the vertical upright posts can freely adjust the position between the top ring and the bottom ring, so that the applicable test working condition is wider.
Drawings
FIG. 1 is a schematic structural view of a first preferred embodiment;
FIG. 2 is a detailed view of the horizontal adjustment assembly and bracket structure of the first preferred embodiment;
in the figure, 1, model box; 2. supporting legs; 3. a vertical height adjustment assembly; 31. moving the support; 32. a first locking structure; 321. a bolt; 322. positioning a plate; 323. fixing a nut; 33. a bracket; 4. a horizontal adjusting component; 41. a carriage; 42. a locking structure II; 421. a pentagonal flange nut; 422. a pentagonal bolt; 43. a collar; 5. a fixed mount; 51. a top ring; 52. a vertical column; 53. a bottom ring; 54. a slide lock structure; 541. a collar; 542. locking the nut; 6. a level gauge; 7. and (7) positioning the holes.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings
First preferred embodiment:
a sensor positioning tool is shown in figure 1 and comprises a model box 1, a fixing frame 5 for placing a piece to be measured at the center, and supporting legs 2 for connecting the model box 1 and the fixing frame 5; the supporting legs 2 are connected with the model box 1 through bolts 321, and a plurality of positioning holes 7 are formed in the bottom plate of the model box 1, so that the fixing frame 5 can be conveniently positioned under different working conditions; the supporting feet 2 are arranged in a plurality in the orthogonal direction, and provide stable support for the device.
Mount 5 closes in enclosing and has a plurality of stations of installation LVDT displacement sensor in a piece outer lane that awaits measuring, be equipped with the linkage station on mount 5 along the level that awaits measuring a piece relative movement to adjusting part 4, drive the level to adjusting part 4 oscilaltion motion's vertical altitude mixture control subassembly 3, can adjust displacement sensor's vertical and level as required in the experiment to the position in order to adapt to the experiment demand, the deformation displacement condition that is located the many places of focus of a piece that awaits measuring can be surveyed simultaneously to the linkage station on mount 5.
As shown in fig. 1, the vertical height adjusting assembly 3 includes a bracket 33 slidably connected to the fixed frame 5, a sliding groove for sliding the bracket 33 on the fixed frame 5, and a first locking structure 32 for limiting the movement of the bracket 33, and the vertical position of the bracket 33 can be adjusted on the sliding groove on the fixed frame 5 in an experiment, and the bracket 33 is locked by the first locking structure 32 after being adjusted to a proper position, so as to meet the test requirements of different positions of the to-be-tested piece.
The first locking structure 32 comprises a bolt 321, a positioning plate 322 and a fixing nut 323, the bolt 321 penetrates through the positioning plate 322 and a cutting groove of the vertical upright column 52 of the fixing frame 5, and the first locking structure is locked with the bracket 33 through the nut after being adjusted to a preset position in an experiment, so that errors caused by dislocation in the experiment process are prevented.
As shown in fig. 2, the horizontal adjusting assembly 4 includes a sliding frame 41 connected to the bracket 33 in a sliding manner and a second locking structure 42 for locking the position of the sliding frame.
The second locking structure 42 comprises a pentagonal flange nut 421 and a pentagonal bolt 422, the pentagonal flange nut 421 penetrates through the bracket 33 and the side cutting groove of the sliding frame 41, and is locked with the bracket 33 through the pentagonal flange nut 421, and in an experiment, the sliding frame 41 can be adjusted to a preset position at will, and the pentagonal flange nut 421 is screwed to be locked.
As shown in fig. 2, a plurality of radius adjustable lantern rings 43 are connected to the sliding rack 41, so that displacement sensors of different models can be fixed in an experiment; the bracket 33 and the carriage 41 are channel steels; the movable support 31 is a channel steel; the supporting legs 2 are L-shaped channel steel, and the channel steel has high strength, so that the influence on the accuracy of the experiment caused by the accidental deformation of the movable support 31 and the supporting legs 2 in the experiment is prevented; the lower end of the supporting leg 2 is connected with the bottom plate of the model box 1 through a bolt 321, so that the connection is firm and stable, and the disassembly and the assembly are convenient.
As shown in fig. 1, the fixing frame 5 comprises a top ring 51, a bottom ring 53 and a plurality of vertical columns 52 arranged along the bottom ring 53, the bracket 33 is connected to the vertical columns 52 in a sliding manner, and the vertical columns 52 are connected with the top ring 51 and the bottom ring 53 in a sliding manner through a sliding locking structure 54, so that the fixing frame has strong flexibility and cannot generate relative dislocation in an experiment; the bottom ring 53 is provided with a level gauge 6 which is used for monitoring whether the whole device is horizontal in an experiment, and if the device is inclined, the movable support 31 is adjusted in time to keep the device horizontal.
Second preferred embodiment: a displacement measurement method for a point of interest of a piece to be measured comprises the following steps:
s1, preparation phase
S1.1, determining experimental working conditions such as distribution of different types of soil layers, burial depth of a piece to be tested and the like according to research needs;
s1.2, debugging and calibrating the LVDT displacement sensor, and pre-installing the LVDT displacement sensor on the sliding frame 41.
S2, experimental stage
S2.1, positioning and installing supporting legs 2 on a bottom plate of the model box 1;
s2.2, filling soil in the model box 1 in layers and tamping the soil to a preset height, adjusting the fixing frame 5 to a proper position through the movable support 31, adjusting the vertical upright post to a preset position and then locking the vertical upright post, observing the level gauge 6 and ensuring the level of the device;
s2.3, positioning and arranging a piece to be detected in the center of the fixing frame 5;
s2.4, adjusting the brackets 33 on the sliding grooves of the vertical upright posts 52 of each fixing frame 5 to a required height, adjusting the horizontal position of the sliding frame 41, and locking the sliding frame through a locking structure after the adjustment is finished.
S2.5, connecting the displacement sensor with a data acquisition instrument;
s2.6 starts loading.
S4 end stage
And S4.1, processing the data acquired by the data acquisition instrument after the loading is finished.
The above-mentioned embodiments are merely illustrative and not restrictive, and those skilled in the art can make modifications to the embodiments without inventive contribution as required after reading the present specification, but only protected by the patent laws within the scope of the claims.
Claims (10)
1. The utility model provides a sensor location frock which characterized in that: comprises a model box (1), a fixed frame (5) with the center for placing a part to be tested, and a supporting leg (2) for connecting the model box (1) and the fixed frame (5);
the fixing frame (5) is enclosed to be closed and is provided with a plurality of stations for installing the LVDT displacement sensors on the outer ring of the piece to be measured, and the fixing frame (5) is provided with a linkage station which moves towards the adjusting component (4) along the level of the piece to be measured and a vertical height adjusting component (3) which drives the level to move up and down towards the adjusting component (4).
2. The sensor positioning tool according to claim 1, characterized in that: the vertical height adjusting assembly (3) comprises a moving support (31), a bracket (33) connected to the fixed frame (5) in a sliding mode, a sliding groove for sliding of the bracket on the fixed frame (5), and a first locking structure (32) for limiting the movement of the bracket.
3. The sensor positioning tool according to claim 2, characterized in that: the first locking structure (32) comprises a bolt (321), a positioning plate (322) and a fixing nut (323), and the fixing bolt (321) penetrates through the positioning plate (322) and the fixing frame (5) and is locked with the bracket (33) through the fixing nut (323).
4. The sensor positioning tool according to claim 1, characterized in that: the horizontal adjusting assembly (4) comprises a sliding frame (41) which is connected to the bracket (33) in a transverse sliding mode, a second locking structure (42) for locking the position of the sliding frame, and a plurality of lantern rings (43) positioned on the sliding frame (41), wherein the lantern rings (43) are adjustable in radius.
5. The sensor positioning tool according to claim 4, characterized in that: the second locking structure (42) comprises a pentagonal flange nut (421) and a pentagonal bolt (422), the pentagonal flange nut (421) penetrates through the bracket (33) and the cutting groove of the sliding frame (41), and is locked with the bracket (33) through the pentagonal flange nut (421).
6. The sensor positioning tool according to claim 1, characterized in that: the bracket (33) and the sliding frame (41) are both channel steel; the movable support (31) is a channel steel; the supporting legs (2) are L-shaped channel steel, and the lower end parts of the supporting legs (2) are connected with the bottom plate of the model box (1) through bolts.
7. The sensor positioning tool according to claim 1, characterized in that: the fixing frame (5) comprises a top ring (51), a bottom ring (53) and a plurality of vertical columns (52) arranged along the bottom ring (53), the brackets are connected to the vertical columns (52) in a sliding mode, the top ring (51) and the bottom ring (53) are connected to the vertical columns (52) in a sliding mode through sliding locking structures (54), and the sliding locking structures (54) comprise lantern rings (541) and locking nuts (542).
8. The sensor positioning tool according to claim 1, characterized in that: the bottom ring (53) is provided with a level gauge (6).
9. The sensor positioning tool according to claim 1, characterized in that: the supporting legs (2) are connected with a bottom plate of the model box (1) through bolts, and a plurality of bolt positioning holes (7) are formed in the bottom plate of the model box (1).
10. A method for measuring displacement of a point of interest of a geotechnical experiment pile body is characterized by comprising the following steps:
s1, preparation phase
S1.1, determining experimental working conditions such as distribution of different types of soil layers, burial depth of a piece to be tested and the like according to research needs;
s1.2, debugging and calibrating the LVDT displacement sensor, and pre-installing the LVDT displacement sensor on a sliding frame (41);
s2, experimental stage
S2.1, positioning and installing supporting legs (2) on a bottom plate of the model box (1);
s2.2, filling soil in a layered mode in the model box (1) and tamping to a preset height, adjusting the fixing frame (5) to a proper position through the movable support (31), adjusting the vertical upright post to a preset position and then locking, observing the level gauge (6) and ensuring the level of the device;
s2.3, positioning and arranging a piece to be detected in the center of the fixing frame (5);
s2.4, adjusting the brackets (33) on the sliding grooves of the vertical upright posts (52) of the fixing frames (5) to a required height, adjusting the horizontal position of the sliding frame (41), and locking the sliding frame through a locking structure after the adjustment is finished;
s2.5, connecting the displacement sensor with a data acquisition instrument;
s2.6, starting loading;
s4 end stage
And S4.1, processing the data acquired by the data acquisition instrument after the loading is finished.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111029493.8A CN113932697B (en) | 2021-09-03 | 2021-09-03 | Sensor positioning tool and geotechnical experiment pile body attention point displacement measurement method |
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|---|---|---|---|
| CN202111029493.8A CN113932697B (en) | 2021-09-03 | 2021-09-03 | Sensor positioning tool and geotechnical experiment pile body attention point displacement measurement method |
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| CN113932697A true CN113932697A (en) | 2022-01-14 |
| CN113932697B CN113932697B (en) | 2023-12-19 |
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