CN214250953U - Layering subsides mark for centrifugal model test - Google Patents
Layering subsides mark for centrifugal model test Download PDFInfo
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- CN214250953U CN214250953U CN202120504021.2U CN202120504021U CN214250953U CN 214250953 U CN214250953 U CN 214250953U CN 202120504021 U CN202120504021 U CN 202120504021U CN 214250953 U CN214250953 U CN 214250953U
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Abstract
The utility model discloses a mark is subsided with layering to centrifugal model test, concretely relates to fill engineering monitoring field, including the sleeve, subside the base, subside transmission pole and laser reflecting plate, subside the top of base and the bottom welding of subsiding the transmission pole, the inboard of spacing snap ring cup joints with the outside activity of subsiding the transmission pole, and the outside of subsiding the transmission pole cup joints with telescopic inboard activity, and the outside of mounting thread and mounting nut's inboard threaded connection. The utility model discloses a sleeve, settlement base, the structural design who subsides transmission pole and laser reflecting plate make subside the mark through the dismouting and the sleeve of subsiding transmission pole and laser reflecting plate and the mutual motion of subsiding the transmission pole in the monitoring process to reduce earth's surface ponding to the harmful effects of monitoring to a certain extent, promoted laser displacement sensor's result of use, reduced monitoring error, improve the monitoring gained layering and subside numerical accuracy.
Description
Technical Field
The utility model relates to a fill engineering monitoring technology field, more specifically say, the utility model particularly relates to a centrifugal model is experimental with layering subsides mark.
Background
In filling subgrades, earth dams, airport filling subgrades and filling engineering foundations in urban construction, layered settlement data are important data for monitoring, and the layered settlement data have important reference and guiding effects in optimizing design parameters before filling foundation construction, controlling construction rate in the middle period of filling construction and ensuring construction quality in the later period of construction.
The field in-situ monitoring period is long, the influence factors are various, the monitoring device is complicated to bury, the manufacturing cost is high, the measuring result is not ideal, a centrifugal model test can be adopted for testing, the layered settlement is monitored, and the current methods for monitoring the surface settlement in the centrifugal process are mainly two types: laser displacement sensor monitoring and differential displacement sensor monitoring, laser displacement sensor monitoring is non-contact measurement, and differential displacement sensor is contact measurement, compares with differential displacement sensor, and laser displacement sensor monitors characteristics such as high sensitivity, high accuracy and quick and real-time, but this kind of method all has certain shortcoming:
1. the existing soil layer centrifugal model test is used for monitoring the surface layer sedimentation of the soil layer, the method is that a laser displacement sensor is directly hit on the surface of the soil, the surface sedimentation is large, the laser displacement sensor can monitor the surface sedimentation, but the sedimentation and the layered sedimentation of the deep layer in the soil body cannot be monitored, the deep layer sedimentation can only be estimated by identifying the position change generated after the centrifugal test, the direction and the trend of the sedimentation displacement are estimated, and the numerical error of the layered sedimentation in the soil body is large;
2. whether the monitoring is carried out by a laser displacement sensor and a differential displacement sensor, a soil layer is required to be soaked and saturated before the monitoring is carried out, water is accumulated on the surface of the ground in the process of a simulated consolidation centrifugal test, and if the monitoring is carried out by adopting a contact type differential displacement sensor, the soil body is too soft after being saturated and cannot be measured; if the non-contact laser displacement sensor is directly adopted to monitor the ground surface settlement, the accumulated water on the ground surface can cause the laser to have serious reflection and refraction, the displacement measurement value can be seriously disturbed, and the measured data can not meet the requirement.
SUMMERY OF THE UTILITY MODEL
In order to overcome prior art's above-mentioned defect, the embodiment of the utility model provides a mark is subsided with layering to centrifugal model test, through setting up the sleeve, subside the base, subside transmission pole and laser-reflecting plate, utilize the inside sleeve that is equipped with spacing snap ring, the outside overlaps telescopic subsides the transmission pole, dismantled and assembled subsides transmission pole and laser-reflecting plate and the laser-reflecting plate that the surface roughening was handled, make subside the mark through the dismouting and the sleeve of subsiding transmission pole with the laser-reflecting plate and the mutual motion of subsiding the transmission pole in the monitoring process, subside the process and the separation of layering settlement process of the inside deep layer of the soil body, in order to solve the problem that proposes in the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme: a layered settlement mark for a centrifugal model test comprises a sleeve, a settlement base, a settlement transmission rod and a laser reflection plate, wherein a centrifugal model test box is arranged on the outer sides of the sleeve, the settlement base, the settlement transmission rod and the laser reflection plate, the top end of the settlement base is welded with the bottom end of the settlement transmission rod, the sleeve comprises a sleeve body, the inner side of the sleeve body is provided with a limiting snap ring, the inner side of the limiting snap ring is movably sleeved with the outer side of the settlement transmission rod, the outer side of the settlement transmission rod is movably sleeved with the inner side of the sleeve, the top end of the settlement transmission rod is provided with an installation thread, the bottom end of the laser reflection plate is welded with an installation nut, the outer side of the installation thread is in threaded connection with the inner side of the installation nut, the sleeve is a small-density high-strength metal pipe, and the settlement base is a small-density high-strength aluminum plate, the settlement transfer rod is a light high-strength aluminum thin rod, the laser reflection plate is a light material plate, and the inner side of the sleeve is subjected to water seepage prevention treatment.
Preferably, the number of the limiting snap rings is three, and the three limiting snap rings are respectively distributed at the upper part, the middle part and the lower part of the inner side of the sleeve body.
Preferably, the size of a gap between the inner side of the limiting clamp ring and the outer side of the settlement transfer rod is 1mm, and vaseline is smeared on the outer side of the settlement transfer rod.
Preferably, the bottom surface of the sedimentation base is circular or square, and the diameter or the side length of the sedimentation base is one tenth of the width of the centrifugal model test box.
Preferably, the length of the sedimentation transfer rod is smaller than the height of the centrifugal model test chamber.
Preferably, the surface of the laser reflector is roughened, and the surface roughness of the laser reflector is 1.6-12.5 μm.
The utility model discloses a technological effect and advantage:
the utility model discloses a sleeve, subside the base, subside the structural design of transmission pole and laser reflecting plate, utilize the inside sleeve that is equipped with spacing snap ring, the outside telescopic transmission pole that subsides that is overlapped, dismantled and assembled subsides transmission pole and laser reflecting plate and the laser reflecting plate of surface roughening treatment, make and subside the mark through the dismouting and the sleeve of subsiding transmission pole and laser reflecting plate and the mutual motion of subsiding the transmission pole in the monitoring process, subside the process separation with the inside deep settlement of the soil body and layering, and reduced earth's surface ponding to a certain extent and to the harmful effects of monitoring, laser displacement sensor's result of use has been promoted, the monitoring error has been reduced, improve the monitoring gained layering and subside numerical accuracy.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of the overall internal structure of the present invention;
fig. 3 is a schematic structural diagram of the utility model at a in fig. 2;
fig. 4 is a schematic diagram of the position of the present invention during operation.
The reference signs are:
1. a sleeve; 2. a sedimentation base; 3. a settlement transfer rod; 4. a laser reflecting plate; 11. a sleeve body; 12. a limit snap ring; 41. and (6) mounting the nut.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The layered settlement mark for the centrifugal model test shown in the attached figures 1-4 comprises a sleeve 1, a settlement base 2, a settlement transmission rod 3 and a laser reflection plate 4, wherein the outer sides of the sleeve 1, the settlement base 2, the settlement transmission rod 3 and the laser reflection plate 4 are provided with a centrifugal model test box, the top end of the settlement base 2 is welded with the bottom end of the settlement transmission rod 3, the sleeve 1 comprises a sleeve body 11, the inner side of the sleeve body 11 is provided with a limit snap ring 12, the inner side of the limit snap ring 12 is movably sleeved with the outer side of the settlement transmission rod 3, the outer side of the settlement transmission rod 3 is movably sleeved with the inner side of the sleeve 1, the top end of the settlement transmission rod 3 is provided with a mounting thread, the bottom end of the laser reflection plate 4 is welded with a mounting nut 41, the outer side of the mounting thread is connected with the inner side thread of the mounting nut 41, the sleeve 1 is made of a small-density high-strength metal pipe, the settlement base 2 is made of a small-density high-strength aluminum plate, the settlement transfer rod 3 is a light high-strength aluminum thin rod, the laser reflection plate 4 is a light material plate, and the inner side of the sleeve 1 is subjected to water seepage prevention treatment.
As shown in fig. 2, the number of the limit snap rings 12 is three, and the three limit snap rings 12 are respectively distributed at the upper part, the middle part and the lower part of the inner side of the sleeve body 11;
particularly, the arrangement of the limiting snap ring 12 enables the settlement transfer rod 3 to be vertical in the deep settlement process or the layered settlement process during monitoring, so that the numerical accuracy of the layered settlement obtained by monitoring is improved.
Wherein, the size of a gap between the inner side of the limit snap ring 12 and the outer side of the settlement transfer rod 3 is 1mm, and vaseline is smeared on the outer side of the settlement transfer rod 3;
specifically, the arrangement of the gap and the vaseline enables the sedimentation transfer rod 3 to slide on the inner side of the sleeve 1, so that a sedimentation process and a layered sedimentation process of a deep layer in a soil body are separated, and friction between the sedimentation transfer rod 3 and the limiting clamp ring 12 is reduced.
Wherein, the bottom surface of the sedimentation base 2 is round or square, and the diameter or side length of the sedimentation base 2 is one tenth of the width of the centrifugal model test box;
specifically, the setting of the sedimentation base 2 enables the sedimentation base 2 to be sedimentated together with the soil around the sedimentation base 2, if the area of the sedimentation base 2 is too small, the volume of the soil contacting with the surroundings is too small, and the sedimentation base is easy to incline during monitoring, and has adverse effect on the obtained layered sedimentation result.
As shown in fig. 4, the length of the sedimentation transfer rod 3 is less than the height of the centrifugal model test chamber;
specifically, the arrangement of the sedimentation transfer rod 3 enables the sedimentation transfer rod 3 to be kept vertical in a centrifugal state during monitoring, and a moving space is reserved for a laser displacement sensor at the top of the centrifugal model test box.
Wherein, the surface of the laser reflecting plate 4 is roughened, and the surface roughness of the laser reflecting plate 4 is 1.6-12.5 μm;
specifically, the laser reflecting plate 4 is arranged, so that the laser reflecting plate 4 is more easily detected by the laser displacement sensor, the adverse effect of surface water on monitoring is reduced to a certain extent, and the using effect of the laser displacement sensor is improved.
The utility model discloses the theory of operation:
a layered settlement mark for a centrifugal model test comprises a sleeve 1, a settlement base 2, a settlement transfer rod 3 and a laser reflection plate 4;
the sleeve 1 is sleeved outside the sedimentation transfer rod 3. The settlement transfer rod 3 is separated from the surrounding soil body, so that the settlement base 2 cannot settle synchronously with the soil body due to the friction force generated by the contact between the settlement transfer rod 3 and the surrounding soil body, and the measurement result of the layered settlement amount of the soil body has larger error. The sleeve 1 is made of a metal pipe with high strength and low density. The centrifugal model test has the advantages that as the centrifugal acceleration of the centrifugal model test is very large, the centrifugal acceleration rate is often dozens to hundreds, huge lateral static soil pressure can be generated, the strength is high so as to prevent the sleeve 1 from being crushed and deformed, the density is low so as to reduce the sedimentation of the sleeve 1 in the centrifugal state and avoid influencing sedimentation monitoring, and 3 limiting snap rings 12 are arranged at the upper, middle and lower positions in the sleeve 1 so as to ensure that the sedimentation transfer rod 3 is kept vertical;
settling base 2: aluminum plates or other similar materials with high strength and low density are adopted. The diameter or the side length of the circular or square centrifugal model test box is one tenth of the width of the centrifugal model test box, so that the sedimentation base 2 can be sedimented together with soil around the sedimentation base, and if the area of the sedimentation base 2 is too small, the volume of the soil contacting with the periphery is too small and the soil is easy to incline;
the settlement transfer rod 3: this rod connects the sedimentation base 2 and the laser reflection plate 4. Similarly, a light and high-strength aluminum slender rod is welded with the sedimentation base 2 and is connected with the laser reflection plate 4 through a threaded nut, the length of a transmission rod cannot exceed the top of a centrifugal model box, the wind of a laboratory outside the centrifugal model box is particularly large and can shake under a centrifugal state, in addition, due to the limitation of the upper space and the lower space of a platform for placing the centrifugal model test box, a bracket of a laser displacement sensor cannot be too high, the space from the laser displacement sensor to the laser reflection plate 4 is limited, the sedimentation transmission rod 3 is uniformly coated with vaseline to reduce the friction with a limiting snap ring 12 in a sleeve, and the gap between the limiting snap ring 12 and the sedimentation rod is about 1 mm;
laser reflection plate 4: the light material is adopted, the surface roughness and the gloss have influence on the monitoring result, a darker surface is generally selected for measurement, and the roughness value of the measured surface is controlled between 1.6 mu m and 12.5 mu m.
The utility model discloses a working procedure:
step 1: according to actual engineering, the soil thickness of a centrifugal model test soil layer is determined by reducing according to a scale, a layered filling method is adopted, firstly, soil is filled inwards to a specified height in a model, the soil is compacted to a specified compaction degree, the surface of the soil layer is leveled, and the surface is roughened;
step 2: assembling a sleeve 1, a sedimentation base 2 and a sedimentation transmission rod 3 of a layered sedimentation target for a centrifugal model test, firstly, not installing a laser reflection plate 4, placing the sedimentation base 2 of the layered sedimentation target for the centrifugal model test on the top surface of a soil layer in the first step, fixing the sedimentation transmission rod 3 by adopting a temporary support, and adjusting the temporary support to ensure that the sedimentation transmission rod 3 keeps a vertical state;
and 3, step 3: and then carrying out soil layer filling. Uniformly paving a soil body on the upper layer of the soil layer, compacting the soil body by adopting a compaction hammer to a specified compaction degree, repeating the step 2, and paying attention to uniform and slow compaction around the settlement transfer rod 3 in the compaction process so as to keep the settlement rod in a vertical state;
and 4, step 4: repeating the step 3 to the top soil layer, and completing the layered settlement mark embedding and test soil layer filling for the centrifugal model test;
and 5, step 5: screwing a laser panel on the settlement transfer rods 3 of the layered settlement targets for the centrifugal model test, and connecting by screws;
and 6, step 6: and removing the temporary support, and adjusting the laser displacement sensor to be aligned to the center of the laser reflecting plate 4 to enable the laser to be irradiated on the laser reflecting plate 4.
For the condition that some centrifugal model tests need to immerse and saturate the soil body, accumulated water exists in rainfall and the like, and adverse effects can be generated on monitoring results, water seepage prevention treatment can be performed on the sleeve 1 to prevent water from penetrating into a deep soil layer from the sleeve 1, a waterproof rubber ring can be added, the height of the sleeve 1 on the outermost surface is increased to serve as a double safety measure, the sleeve 1 is higher than the water level of the accumulated water, the possibility that the water directly penetrates into the soil body through the sleeve 1 is reduced, and the soil body is prevented from being unevenly humidified.
The points to be finally explained are: in the description of the present application, it is noted that unless otherwise specified and limited, the terms "mounted," "connected," and "connected" are to be construed broadly, as meaning either a mechanical or electrical connection, or a communication between two elements, either directly,
"upper", "lower", "left", "right", and the like are used only to indicate relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationships may change;
secondly, the method comprises the following steps: in the drawings of the disclosed embodiments of the present invention, only the structures related to the disclosed embodiments are referred to, and other structures can refer to the common design, and under the condition of no conflict, the same embodiment and different embodiments of the present invention can be combined with each other;
and finally: the above description is only for the preferred embodiment of the present invention and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A layered settlement mark for a centrifugal model test comprises a sleeve (1), a settlement base (2), a settlement transmission rod (3) and a laser reflection plate (4), wherein a centrifugal model test box is arranged on the outer sides of the sleeve (1), the settlement base (2), the settlement transmission rod (3) and the laser reflection plate (4), the top end of the settlement base (2) is welded with the bottom end of the settlement transmission rod (3), the layered settlement mark is characterized in that the sleeve (1) comprises a sleeve body (11), a limiting snap ring (12) is arranged on the inner side of the sleeve body (11), the inner side of the limiting snap ring (12) is movably sleeved with the outer side of the settlement transmission rod (3), the outer side of the settlement transmission rod (3) is movably sleeved with the inner side of the sleeve (1), a mounting thread is arranged on the top end of the settlement transmission rod (3), and a mounting nut (41) is welded at the bottom end of the laser reflection plate (4), the outer side of the mounting thread is in threaded connection with the inner side of the mounting nut (41), the sleeve (1) is a low-density high-strength metal pipe, the sedimentation base (2) is a low-density high-strength aluminum plate, the sedimentation transfer rod (3) is a light high-strength aluminum thin rod, the laser reflection plate (4) is a light material plate, and the inner side of the sleeve (1) is subjected to anti-seepage treatment.
2. The layered settlement mark for the centrifugal model test according to claim 1, wherein the number of the limiting snap rings (12) is three, and the three limiting snap rings (12) are respectively distributed at the upper part, the middle part and the lower part of the inner side of the casing body (11).
3. The layered settlement mark for the centrifugal model test according to claim 1, wherein the size of a gap between the inner side of the limiting snap ring (12) and the outer side of the settlement transfer rod (3) is 1mm, and vaseline is coated on the outer side of the settlement transfer rod (3).
4. The layered settlement mark for the centrifugal model test according to claim 1, wherein the bottom surface of the settlement base (2) is circular or square, and the diameter or the side length of the settlement base (2) is one tenth of the width of the centrifugal model test chamber.
5. The stratified settlement mark for centrifugal model test according to claim 1, wherein the length of the settlement transfer rod (3) is smaller than the height of the centrifugal model test chamber.
6. The centrifugal model test delamination sedimentation target according to claim 1, wherein the surface of the laser reflector (4) is roughened, and the surface roughness of the laser reflector (4) is 1.6 μm to 12.5 μm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120504021.2U CN214250953U (en) | 2021-03-09 | 2021-03-09 | Layering subsides mark for centrifugal model test |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116124083A (en) * | 2023-04-12 | 2023-05-16 | 中铁二十三局集团有限公司 | High-fill roadbed settlement observation device and observation method |
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- 2021-03-09 CN CN202120504021.2U patent/CN214250953U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116124083A (en) * | 2023-04-12 | 2023-05-16 | 中铁二十三局集团有限公司 | High-fill roadbed settlement observation device and observation method |
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