CN221167742U - Layered settlement monitoring device for filled foundation - Google Patents
Layered settlement monitoring device for filled foundation Download PDFInfo
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- CN221167742U CN221167742U CN202323174259.1U CN202323174259U CN221167742U CN 221167742 U CN221167742 U CN 221167742U CN 202323174259 U CN202323174259 U CN 202323174259U CN 221167742 U CN221167742 U CN 221167742U
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- 239000000835 fiber Substances 0.000 claims description 59
- 238000004062 sedimentation Methods 0.000 claims description 59
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- 235000014676 Phragmites communis Nutrition 0.000 description 1
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- 238000005429 filling process Methods 0.000 description 1
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Abstract
The utility model discloses a layered settlement monitoring device for a filled foundation, which comprises a settlement monitoring module, a ground surface settlement mark and an anchoring head, wherein the settlement monitoring module comprises a plurality of settlement monitoring units which are sequentially connected from top to bottom, each settlement monitoring unit comprises a settlement plate and a two-section type telescopic pipe, an elastic protective sleeve is sleeved outside the two-section type telescopic pipe, a rubber pipe is arranged inside the two-section type telescopic pipe, and an optical fiber grating is arranged in the rubber pipe in a penetrating manner. The settlement monitoring module is formed by sequentially connecting a plurality of settlement monitoring units from top to bottom, so that the simultaneous monitoring of the settlement conditions of a plurality of soil layers is realized, the problem that the conventional settlement monitoring module is easy to incline in the testing process can be effectively solved, and the accuracy of the settlement monitoring result is ensured.
Description
Technical Field
The utility model belongs to the technical field of geotechnical engineering monitoring and detection, and particularly relates to a layered settlement monitoring device for a filled foundation.
Background
When roads, railways, airports, industrial and civil buildings are built in mountainous areas and hilly and gully areas, filling engineering is often needed to meet the requirements of elevation and smoothness. In order to accurately grasp the settlement amount, settlement difference and deformation development rule of the filling soil body, ensure the stability of the newly built structure and can be put into normal use as expected, the settlement monitoring needs to be carried out on the filling soil field. The traditional observation method is to monitor the soil settlement by using a magnetic ring type settlement meter, wherein the magnetic ring and a protective tube are buried in the position of an observation point by drilling, and then the position change of the magnetic ring is measured by using a probe and a measuring ruler through the magnetic induction principle, so that the settlement of the soil of each layer is calculated. The method has the advantages of low observation precision, magnetic field interference, difficulty in clamping the hole wall of the magnetic ring reed claw, difficulty in ensuring synchronous deformation between the magnetic ring and the stratum, complex structure of a monitoring instrument, difficulty in installation, low construction efficiency and the like, and cannot monitor the settlement in the backfilling process of each stratum in real time. Meanwhile, the existing sedimentation tube is easy to incline in the test process. Therefore, development of a device for monitoring layered settlement of a filled foundation, which has the advantages of simple structure, convenient equipment burying, high measurement precision and high modularization degree, is needed, the automation degree and the intelligent level of monitoring equipment are improved, and the efficiency and the safety of engineering construction are improved.
Disclosure of utility model
The technical problem to be solved by the utility model is to provide the layered settlement monitoring device for the filled foundation, which has reasonable design and reliable structure, and the settlement monitoring module is formed by sequentially connecting a plurality of settlement monitoring units from top to bottom, so that the simultaneous monitoring of the settlement conditions of a plurality of soil layers is realized, the problem that the conventional settlement monitoring module is easy to incline in the testing process can be effectively solved, and the accuracy of the settlement monitoring result is ensured.
In order to solve the technical problems, the utility model adopts the following technical scheme: the utility model provides a fill foundation layering subsides monitoring devices which characterized in that: the system comprises a settlement monitoring module buried in a backfill layer, a ground surface settlement mark arranged at the top of the settlement monitoring module and an anchoring head arranged at the bottom of the settlement monitoring module and anchored in an original foundation;
The settlement monitoring module comprises a plurality of settlement monitoring units which are sequentially connected from top to bottom, each settlement monitoring unit comprises a settlement plate and a two-section telescopic pipe connected to the bottom of the settlement plate, an elastic protective sleeve is sleeved outside the two-section telescopic pipe, a rubber pipe is arranged inside the two-section telescopic pipe, fiber bragg gratings are arranged in the rubber pipe in a penetrating manner, two ends of each fiber bragg grating are respectively bonded and fixed with inner walls of two ends of the rubber pipe, a plurality of fiber bragg gratings are connected in series to form a fiber bragg grating string, holes for the fiber bragg grating string to pass through are formed in the settlement plate, and a fiber bragg grating demodulator is connected to the upper end of the fiber bragg grating string;
The upper ends of the two-section type telescopic pipe, the elastic protective sleeve and the rubber pipe are all connected to the bottoms of the sedimentation plates in the sedimentation monitoring units corresponding to the two-section type telescopic pipe, the elastic protective sleeve and the rubber pipe, and the lower ends of the two-section type telescopic pipe, the elastic protective sleeve and the rubber pipe are all connected to the tops of the sedimentation plates in the lower sedimentation monitoring units adjacent to the two-section type telescopic pipe, the elastic protective sleeve and the rubber pipe.
Foretell a fill foundation layering subsides monitoring devices, its characterized in that: the two ends of the rubber tube are provided with convex edges, and the convex edges are fixedly connected with the adjacent sedimentation plates through screws.
Foretell a fill foundation layering subsides monitoring devices, its characterized in that: the sedimentation plate, the two-section telescopic tube, the elastic protective sleeve and the rubber tube are coaxially arranged.
Foretell a fill foundation layering subsides monitoring devices, its characterized in that: the two-section telescopic tube comprises an outer sleeve and an inner sleeve which is inserted in the lower end of the outer sleeve in a sliding manner, two sliding blocks are arranged at the upper end of the inner sleeve, and two sliding grooves matched with the sliding blocks are formed in the outer sleeve.
Foretell a fill foundation layering subsides monitoring devices, its characterized in that: the top of subsider and anchor head all is provided with keeps off the ring, the bottom of subsider is provided with down keeps off the ring.
Foretell a fill foundation layering subsides monitoring devices, its characterized in that: the upper ends of the outer sleeve and the elastic protective sleeve are connected with the lower baffle ring adjacent to the outer sleeve and the elastic protective sleeve through bolts, and the lower ends of the inner sleeve and the elastic protective sleeve are connected with the upper baffle ring adjacent to the inner sleeve and the elastic protective sleeve through bolts.
Foretell a fill foundation layering subsides monitoring devices, its characterized in that: the upper end of the fiber bragg grating string is connected with the fiber bragg grating demodulator through a fiber optic lead.
Foretell a fill foundation layering subsides monitoring devices, its characterized in that: the elastic protective sleeve is a corrugated pipe.
Foretell a fill foundation layering subsides monitoring devices, its characterized in that: the top of the sedimentation plate at the uppermost end of the sedimentation monitoring module is connected with a supporting pipe for installation of a surface sedimentation mark.
Compared with the prior art, the utility model has the following advantages:
1. According to the utility model, the sedimentation monitoring modules are formed after the sedimentation monitoring units are sequentially connected from top to bottom, so that simultaneous monitoring of the sedimentation conditions of a plurality of soil layers is realized, meanwhile, the sedimentation monitoring units can be assembled layer by layer in the backfill process, and the sedimentation amount in the soil layer backfill process can be measured.
2. According to the utility model, by arranging the two-section telescopic pipe and the elastic protective sleeve, the problem that the traditional sedimentation monitoring module is easy to incline in the testing process can be effectively solved, and the accuracy of a sedimentation monitoring result is ensured; meanwhile, the elastic protective sleeve can play a role in protecting the measuring device in the two-section telescopic pipe, so that the interference and influence of surrounding soil on the monitoring device are greatly reduced.
3. According to the utility model, the fiber bragg grating is adopted to measure stratum settlement, so that the measured layered settlement is more accurate, the fiber bragg grating unit strain signal is read by the fiber bragg grating demodulator, the obtained result avoids errors of manual reading, and the layered settlement result is more accurate.
4. According to the utility model, the anchoring head is arranged at the bottom of the settlement monitoring module and is arranged in the original foundation soil layer, so that the anchoring head can be used as a datum point, a relatively stable datum reference point can be formed, and accurate settlement monitoring of the backfill soil layer is realized.
In conclusion, the settlement monitoring device is reasonable in design and reliable in structure, and the settlement monitoring modules are formed by sequentially connecting the settlement monitoring units from top to bottom, so that simultaneous monitoring of the settlement conditions of a plurality of soil layers is realized, the problem that the conventional settlement monitoring modules are easy to incline in the testing process can be effectively solved, and the accuracy of the settlement monitoring results is ensured.
The technical scheme of the utility model is further described in detail through the drawings and the embodiments.
Drawings
Fig. 1 is a perspective view of the present utility model.
Fig. 2 is an elevation view of the present utility model.
Fig. 3 is a schematic diagram of a connection structure between a surface subsidence mark and a subsidence monitoring module according to the present utility model.
FIG. 4 is a schematic view showing the connection structure of the settling plate, the upper baffle ring and the lower baffle ring of the present utility model.
Fig. 5 is a schematic view of the connection structure of the outer sleeve and the inner sleeve according to the present utility model.
Fig. 6 is a cross-sectional view A-A of fig. 2.
Reference numerals illustrate:
1-a sedimentation plate; 2-two-section telescopic tube; 2-1-an outer sleeve;
2-inner sleeve; 2-3-slide block; 3-an elastic protective sleeve;
4-a rubber tube; 5-optical fiber grating; 6-an optical fiber lead;
7-a fiber bragg grating demodulator; 8-an upper baffle ring; 9-a lower baffle ring;
10-a bolt; 11-an anchor head; 12-a ground surface subsidence mark;
13-supporting the tube; 14-original foundation; 15-backfill layer.
Detailed Description
As shown in fig. 1 to 6, the utility model comprises a settlement monitoring module buried in a backfill layer 15, a ground surface settlement mark 12 arranged at the top of the settlement monitoring module, and an anchoring head 11 arranged at the bottom of the settlement monitoring module and anchored in an original foundation 14;
The settlement monitoring module comprises a plurality of settlement monitoring units which are sequentially connected from top to bottom, each settlement monitoring unit comprises a settlement plate 1 and a two-section type telescopic pipe 2 connected to the bottom of the settlement plate 1, an elastic protection sleeve 3 is sleeved outside the two-section type telescopic pipe 2, a rubber pipe 4 is arranged inside the two-section type telescopic pipe 2, a fiber bragg grating 5 is arranged in the rubber pipe 4 in a penetrating manner, two ends of the fiber bragg grating 5 are respectively bonded and fixed with inner walls at two ends of the rubber pipe 4, a plurality of the fiber bragg gratings 5 are connected in series to form a fiber bragg grating string, a hole for the fiber bragg grating string to pass through is formed in the settlement plate 1, and a fiber bragg grating demodulator 7 is connected to the upper end of the fiber bragg grating string;
The upper ends of the two-section type telescopic pipe 2, the elastic protective sleeve 3 and the rubber pipe 4 are all connected to the bottom of the sedimentation plate 1 in the sedimentation monitoring unit corresponding to the two-section type telescopic pipe, and the lower ends of the two-section type telescopic pipe 2, the elastic protective sleeve 3 and the rubber pipe 4 are all connected to the top of the sedimentation plate 1 in the lower sedimentation monitoring unit adjacent to the two-section type telescopic pipe.
During actual use, the sedimentation monitoring modules are formed by sequentially connecting the sedimentation monitoring units from top to bottom, so that simultaneous monitoring of sedimentation conditions of a plurality of soil layers is realized, meanwhile, the sedimentation monitoring units can be assembled layer by layer along with backfill soil backfill processes, and the sedimentation amount in the soil layer backfill processes can be measured.
It should be noted that, by arranging the two-section telescopic tube 2 and the elastic protective sleeve 3, the problem that the traditional sedimentation monitoring module is easy to incline in the testing process can be effectively solved, and the accuracy of the sedimentation monitoring result is ensured; meanwhile, the elastic protective sleeve 3 can play a role in protecting the measuring device in the two-section type telescopic pipe 2, so that the interference and influence of surrounding soil on the monitoring device are greatly reduced.
In the concrete implementation, the fiber bragg grating 5 is adopted to measure stratum settlement, so that the measured layered settlement is more accurate, the fiber bragg grating 5 unit strain signal is read by the fiber bragg grating demodulator 7, and the obtained result avoids errors of manual reading, so that the layered settlement result is more accurate.
During actual use, through set up rubber tube 4 in fiber bragg grating 5 outside to in arranging rubber tube 4 in two segmentation flexible pipe 2, on the one hand reduced the risk that fiber bragg grating 5 was damaged by the foreign object in the monitoring process, on the other hand guaranteed that fiber bragg grating 5 takes place to strain and the unanimity that the soil layer subsided, guaranteed subsided monitoring device monitoring result's accuracy.
During specific implementation, the sedimentation plate 1 is horizontally arranged, the two-section telescopic tube 2, the elastic protective sleeve 3 and the rubber tube 4 are vertically arranged, the sedimentation plate 1 is round, the diameter of the sedimentation plate is 30cm, the sedimentation plate 1 is a stainless steel plate, holes formed in the sedimentation plate 1 for the fiber bragg grating strings to pass through are round holes, the aperture of the holes is 2cm, and the holes formed in the sedimentation plate 1 for the fiber bragg grating strings to pass through are coaxially arranged with the sedimentation plate 1.
It should be noted that, the fiber bragg grating 5 is used for monitoring the settlement displacement change of the backfill layer 15, specifically, after the fiber bragg grating 5 is fixed to two ends of the rubber tube 4, the rubber tube 4 and the fiber bragg grating 5 are pre-stretched, the pre-stretching amount of the fiber bragg grating 5 exceeds the maximum compression amount of the layered backfill obtained through theoretical calculation, and the compression amount of the subsequent backfill layer is ensured not to exceed the compression deformation range of the fiber bragg grating 5; the two ends of the fiber bragg grating 5 are respectively fixed in the two ends of the rubber tube 4 through epoxy resin AB glue, and the fiber bragg grating 5 and the rubber tube 4 deform synchronously.
When each soil layer subsides, the fiber grating 5 and the rubber tube 4 displace and deform synchronously along with the subsidence monitoring module, the lengths of the rubber tube 4 and the fiber grating 5 change, and the grating wavelength changes, the wavelength before and after the deformation of the fiber grating string can be measured by using the fiber grating demodulator 7, and the strain change of the fiber grating 5 can be obtained by calculating the wavelength change through computer software, so as to reflect the subsidence of the corresponding soil layer.
In order to monitor the settlement of soil layers with different thicknesses, the distance between the settlement plates 1 is adjusted by the stretching dislocation between the inner sleeve 2-2 and the outer sleeve 2-1.
It should be noted that, by arranging the anchor head 11 at the bottom of the settlement monitoring module and installing the anchor head in the soil layer of the original foundation 14, the anchor head 11 can be used as a reference point, so that a relatively stable reference point can be formed, and accurate settlement monitoring of the backfill soil layer is realized.
In practice, the soil layer of the original foundation 14 should have sufficient strength and stability, and the contact area between the anchor head 11 and the original foundation 14 is filled with concrete.
In the concrete implementation, the sedimentation plate 1, the inner sleeve 2-2, the outer sleeve 2-1 and the anchoring head 11 all have stronger strength and rigidity, so that the sedimentation plate is not excessively deformed under the action of stress.
As shown in fig. 2 and 4, in this embodiment, two ends of the rubber tube 4 are provided with protruding edges, and the protruding edges are fastened and connected with the adjacent sedimentation plates 1 by screws.
In actual use, two ends of the rubber tube 4 are respectively clung to the two sedimentation plates 1.
In this embodiment, the sedimentation plate 1, the two-stage telescopic tube 2, the elastic protective sleeve 3 and the rubber tube 4 are coaxially arranged.
As shown in fig. 2, 5 and 6, in this embodiment, the two-section telescopic tube 2 includes an outer tube 2-1 and an inner tube 2-2 slidably inserted into the lower end of the outer tube 2-1, two sliding blocks 2-3 are disposed at the upper end of the inner tube 2-2, and two sliding grooves matched with the sliding blocks 2-3 are disposed in the outer tube 2-1.
When in actual use, the sliding resistance generated when the inner sleeve 2-2 and the outer sleeve 2-1 slide vertically can be reduced due to the arrangement of the sliding blocks 2-3 and the sliding grooves; when the soil layer is settled, the inner sleeve 2-2 and the outer sleeve 2-1 can slide vertically and freely.
When the soil layer is subjected to settlement displacement, the settlement plate 1 embedded into the soil layer is driven to vertically displace, so that the inner sleeve 2-2 and the outer sleeve 2-1 connected with the settlement plate are driven to vertically displace.
In the concrete implementation, the inner sleeve 2-2 and the outer sleeve 2-1 are round tubes, the inner sleeve 2-2 and the outer sleeve 2-1 are stainless steel tubes, the inner diameter of the inner sleeve 2-2 is 6cm, the inner diameter of the outer sleeve 2-1 is 8cm, and the wall thicknesses of the inner sleeve 2-2 and the outer sleeve 2-1 are 0.5cm.
In this embodiment, the top of the settlement plate 1 and the anchoring head 11 are both provided with an upper baffle ring 8, and the bottom of the settlement plate 1 is provided with a lower baffle ring 9.
In actual use, the upper baffle ring 8 and the lower baffle ring 9 are circular rings, and the upper baffle ring 8 and the lower baffle ring 9 are welded with the settlement plate 1.
In this embodiment, as shown in fig. 4, the upper ends of the outer sleeve 2-1 and the elastic protection sleeve 3 are connected with the lower baffle ring 9 adjacent to the outer sleeve through bolts 10, and the lower ends of the inner sleeve 2-2 and the elastic protection sleeve 3 are connected with the upper baffle ring 8 adjacent to the inner sleeve through bolts 10.
When in actual use, the outer sleeve 2-1, the elastic protective sleeve 3 and the lower baffle ring 9 are connected, the outer sleeve 2-1 is sleeved outside the lower baffle ring 9, and the elastic protective sleeve 3 is sleeved outside the outer sleeve 2-1; when the inner sleeve 2-2, the elastic protective sleeve 3 and the lower baffle ring 9 are connected, the upper baffle ring 8 is sleeved outside the inner sleeve 2-2, and the elastic protective sleeve 3 is sleeved outside the upper baffle ring 8; the bolts 10 are arranged along the radial direction of the elastic protective sleeve 3.
As shown in fig. 1, 2 and 3, in this embodiment, the upper end of the fiber bragg grating string is connected to the fiber bragg grating demodulator 7 through a fiber optic lead 6.
In actual use, the fiber optic lead 6 transmits the fiber optic deformation signal measured by the fiber optic grating string to the fiber optic grating demodulator 7.
In this embodiment, the elastic protection sleeve 3 is a bellows.
In actual use, the elastic protective sleeve 3 is made of silicon rubber, and can be subjected to free compression deformation along with the displacement of the sedimentation plate 1, and the inner diameter of the elastic protective sleeve 3 is 10cm.
In this embodiment, as shown in fig. 3, a support tube 13 for installing a surface subsidence mark 12 is connected to the top of the subsidence plate 1 at the uppermost end of the subsidence monitoring module.
In actual use, the lower end of the supporting tube 13 is inserted into the upper baffle ring 8 of the settlement plate 1, and the supporting tube 13 is tightly connected with the upper baffle ring 8 through bolts 10.
The surface subsidence mark 12 is fixed at the upper end of the supporting tube 13, the upper end of the supporting tube 13 exceeds the surface by about 50cm, and the surface subsidence mark 12 is matched with an optical level or an electronic level to monitor the surface subsidence.
The utility model is mainly used for filling foundation engineering, and is characterized in that each layer of sedimentation monitoring units can be buried while filling in the filling process, and the utility model is different from the traditional sedimentation monitoring device in that the traditional device is used for drilling and burying in soil after the filling engineering is finished; the device is assembled layer by layer along with backfilling of the filled soil layer, and after each layer of device is arranged, the device is connected with the fiber grating demodulator 7 to obtain the settlement of the filled soil layer.
The foregoing description is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model, and any simple modification, variation and equivalent structural changes made to the above embodiment according to the technical substance of the present utility model still fall within the scope of the technical solution of the present utility model.
Claims (9)
1. The utility model provides a fill foundation layering subsides monitoring devices which characterized in that: the system comprises a settlement monitoring module buried in a backfill soil layer (15), a ground surface settlement mark (12) arranged at the top of the settlement monitoring module and an anchoring head (11) arranged at the bottom of the settlement monitoring module and anchored in an original foundation (14);
the sedimentation monitoring module comprises a plurality of sedimentation monitoring units which are sequentially connected from top to bottom, each sedimentation monitoring unit comprises a sedimentation plate (1) and a two-section type telescopic pipe (2) connected to the bottom of the sedimentation plate (1), an elastic protection sleeve (3) is sleeved outside the two-section type telescopic pipe (2), a rubber pipe (4) is arranged inside the two-section type telescopic pipe (2), a fiber bragg grating (5) is arranged in the rubber pipe (4) in a penetrating manner, two ends of the fiber bragg grating (5) are respectively bonded and fixed with inner walls of two ends of the rubber pipe (4), a plurality of fiber bragg gratings (5) are connected in series to form a fiber bragg grating string, a hole for the fiber bragg grating string to penetrate is formed in the sedimentation plate (1), and a fiber bragg grating demodulator (7) is connected to the upper end of the fiber bragg grating string;
The upper ends of the two-section type telescopic pipe (2), the elastic protection sleeve (3) and the rubber pipe (4) are all connected to the bottom of the sedimentation plate (1) in the sedimentation monitoring unit corresponding to the two-section type telescopic pipe, the lower ends of the two-section type telescopic pipe (2), the elastic protection sleeve (3) and the rubber pipe (4) are all connected to the top of the sedimentation plate (1) in the lower sedimentation monitoring unit adjacent to the two-section type telescopic pipe.
2. A device for monitoring the layered settlement of a filled foundation according to claim 1, wherein: the two ends of the rubber tube (4) are respectively provided with a convex edge, and the convex edges are fixedly connected with the adjacent sedimentation plates (1) through screws.
3. A device for monitoring the layered settlement of a filled foundation according to claim 1, wherein: the sedimentation plate (1), the two-section telescopic tube (2), the elastic protective sleeve (3) and the rubber tube (4) are coaxially arranged.
4. A device for monitoring the layered settlement of a filled foundation according to claim 1, wherein: the two-section telescopic tube (2) comprises an outer sleeve (2-1) and an inner sleeve (2-2) which is inserted into the lower end of the outer sleeve (2-1) in a sliding manner, two sliding blocks (2-3) are arranged at the upper end of the inner sleeve (2-2), and two sliding grooves matched with the sliding blocks (2-3) are formed in the outer sleeve (2-1).
5. A filled foundation layered settlement monitoring device according to claim 4 wherein: the top of subsider (1) and anchor head (11) all are provided with upper baffle ring (8), the bottom of subsider (1) is provided with lower baffle ring (9).
6. A filled foundation layered settlement monitoring device according to claim 5 wherein: the upper ends of the outer sleeve (2-1) and the elastic protective sleeve (3) are connected with the lower baffle ring (9) adjacent to the outer sleeve through bolts (10), and the lower ends of the inner sleeve (2-2) and the elastic protective sleeve (3) are connected with the upper baffle ring (8) adjacent to the inner sleeve through bolts (10).
7. A device for monitoring the layered settlement of a filled foundation according to claim 1, wherein: the upper end of the fiber bragg grating string is connected with a fiber bragg grating demodulator (7) through a fiber optic lead (6).
8. A device for monitoring the layered settlement of a filled foundation according to claim 1, wherein: the elastic protective sleeve (3) is a corrugated pipe.
9. A device for monitoring the layered settlement of a filled foundation according to claim 1, wherein: the top of the sedimentation plate (1) at the uppermost end of the sedimentation monitoring module is connected with a supporting tube (13) for installing a surface sedimentation mark (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323174259.1U CN221167742U (en) | 2023-11-23 | 2023-11-23 | Layered settlement monitoring device for filled foundation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323174259.1U CN221167742U (en) | 2023-11-23 | 2023-11-23 | Layered settlement monitoring device for filled foundation |
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| Publication Number | Publication Date |
|---|---|
| CN221167742U true CN221167742U (en) | 2024-06-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202323174259.1U Active CN221167742U (en) | 2023-11-23 | 2023-11-23 | Layered settlement monitoring device for filled foundation |
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| CN (1) | CN221167742U (en) |
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- 2023-11-23 CN CN202323174259.1U patent/CN221167742U/en active Active
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