CN215524593U - High-precision detection device for perpendicularity of overlong foundation pile hole - Google Patents
High-precision detection device for perpendicularity of overlong foundation pile hole Download PDFInfo
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- CN215524593U CN215524593U CN202121696451.5U CN202121696451U CN215524593U CN 215524593 U CN215524593 U CN 215524593U CN 202121696451 U CN202121696451 U CN 202121696451U CN 215524593 U CN215524593 U CN 215524593U
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Abstract
The utility model relates to the technical field of pile hole verticality detection, and discloses a high-precision detection device for overlong foundation pile hole verticality, which comprises a tripod, a middle frame, a built-in frame and a vertical placement structure, wherein the tripod is erected right above a pile hole, the middle frame is hung in the pile hole and is arranged by abutting against the wall of the pile hole, the built-in frame is arranged at the bottom of the pile hole, a positioning head is formed in the middle of the built-in frame, the upper part of the vertical placement structure is connected with the tripod, and the lower part of the vertical placement structure penetrates through the middle frame and extends downwards; the vertical placing structure comprises a vertical placing block, and a positioning head is vertically embedded in the vertical placing head. The verticality of the pile hole meets the design requirement, and if the vertical placement blocks and the positioning heads are arranged in a staggered manner, the verticality of the pile hole does not meet the design requirement; like this, realize detecting the verticality in stake hole to, under the effect of middle-placed shelf, avoid hanging down the skew of putting the piece, satisfy the verticality in overlength stake hole and detect the demand.
Description
Technical Field
The utility model relates to the technical field of perpendicularity detection of foundation pile holes, in particular to a high-precision detection device for perpendicularity of an overlong foundation pile hole.
Background
The foundation pile is the most common foundation treatment mode in the current building engineering foundation construction, the construction mode of adopting the pile foundation not only can make the foundation engineering more stable, but also greatly saves the construction cost of the foundation, improves the construction efficiency, and therefore, the pile foundation has wide application in the current building engineering, in particular to large-scale high-rise building engineering.
At present, in a special stratum, an overlong foundation pile needs to be constructed, a rotary drilling hole is adopted to form a pile hole, the depth of the pile hole is large, and the verticality of the pile hole has decisive influence on the verticality of the foundation pile, so that the verticality of the pile hole is very necessary to be measured and detected.
In the prior art, a circular plate with the aperture as much as that of the circular plate is vertically placed in a hole so as not to collide with the circular plate and be smoothly and vertically taken out to meet the acceptance standard; and aiming at the overlong foundation pile, the detection requirement of verticality cannot be met.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a high-precision detection device for perpendicularity of an overlong foundation pile hole, and aims to solve the problem that in the prior art, the perpendicularity of the overlong foundation pile hole is inconvenient to detect.
The utility model is realized in this way, the high-precision detection device of the verticality of the overlong foundation pile hole comprises a tripod, a middle frame, a built-in frame and a vertical placement structure, wherein the tripod is erected right above the pile hole, the middle frame is hung and placed in the pile hole and is arranged by abutting against the wall of the pile hole, the built-in frame is arranged at the bottom of the pile hole, a positioning head is formed in the middle of the built-in frame, the upper part of the vertical placement structure is connected with the tripod, and the lower part of the vertical placement structure penetrates through the middle frame and extends downwards; the vertical placing structure comprises a vertical placing block, and the positioning head is vertically embedded in the vertical placing head.
Furthermore, the tripod comprises a triangular head, a main rod and three auxiliary rods, wherein the inner ends of the auxiliary rods are hinged with the triangular head, the outer ends of the auxiliary rods are abutted against the outside to enable the triangular head to be suspended, and the three auxiliary rods are correspondingly arranged along the circumference of the triangular head at intervals; the upper part of the main rod penetrates through the triangular head, and the lower part of the main rod extends vertically towards the pile hole; the vertical releasing structure comprises a vertical releasing line, the upper part of the vertical releasing line is connected with the triangular head, and the lower part of the vertical releasing line penetrates through the main rod to extend and is connected with the vertical releasing block.
Furthermore, the middle-placed frame comprises a first placed rod and a second placed rod, the first placed rod and the second placed rod are rotatably connected and arranged to form a middle-placed part, and the middle-placed part is positioned in the middle; the first placing rods and the second placing rods are arranged in a crisscross manner or in an overlapping manner; the middle part and the perpendicular bisector of the pile hole are arranged in a superposition mode, and the lower portion of the main rod and the middle part are arranged in a right-to-side mode.
Furthermore, the first rod comprises a first tube and two first rod bodies, two ends of the first tube are movably connected with the inner end of the first rod body respectively, the outer end of the first rod body extends towards the hole wall of the pile hole, and the first rod body and the first tube are arranged in an extending or contracting manner; the second is put the pole and is included the second and put pipe and two second body of rod, the second put the both ends of pipe respectively with the inner of the second body of rod is swing joint and arranges, the outer end orientation of the second body of rod the pore wall direction in stake hole extends to arrange, the second body of rod with the second is put the pipe and is extension or shrink and arrange.
Furthermore, the middle rack comprises a plurality of middle plates, the outer end of the first rod body is buckled with or separated from the middle plates, and the outer end of the second rod body is buckled with or separated from the middle plates; the middle-placed plate is arranged in a flat shape, the middle-placed plate is arranged in an arched arc shape along the direction deviating from the middle-placed part, and the middle-placed plate is tiled and pressed against the hole wall of the pile hole.
Furthermore, the top of the vertical placing block is provided with a hammering surface which is horizontally arranged, the middle part of the hammering surface is provided with a positioning part, and the positioning part is arranged along an upward bulge; the bottom of the middle part is provided with a middle surface which is horizontally arranged, the middle surface is provided with a middle groove which is sunken upwards to form the middle groove, and the middle groove is positioned in the middle of the middle surface; when the middle frame and the vertical block are synchronously hung, the positioning part is embedded with the middle groove.
Furthermore, a gyroscope is arranged inside the vertical placing block and used for detecting the horizontal angle of the hammering surface; and transmitting the gyroscope signal to a background server.
Further, the high-precision detection device for the verticality of the overlong foundation pile hole comprises a plurality of distance meters, the distance meters are respectively installed on the vertical lines, the distance meters are coaxially arranged along the distance meters at intervals and correspondingly, and the distance meters are used for detecting the distance between the distance meters and the hole wall of the pile hole; the range finder is arranged on the vertical placing block, and the range finder and the perpendicular bisector of the vertical placing block are correspondingly arranged.
Further, the built-in frame comprises a built-in ring and a plurality of connecting rods, the built-in ring is annularly arranged, and the periphery of the built-in ring is arranged in a manner of abutting against the hole wall of the pile hole; one end of the connecting rod is connected with the built-in ring, and the other end of the connecting rod is connected with the positioning head; the built-in ring and the positioning head are coaxially arranged.
Further, the high-precision detection device for the verticality of the overlong foundation pile hole comprises a steel reinforcement cage and an alignment head, wherein the alignment head is arranged at the bottom of the steel reinforcement cage and is coaxially arranged with the steel reinforcement cage; the middle part of the positioning head is sunken downwards to form a positioning groove, and the positioning groove is embedded in the alignment head.
Compared with the prior art, the high-precision verticality detection device for the overlong foundation pile hole, provided by the utility model, has the advantages that when the verticality is detected, the center of the pile hole is confirmed through the middle part of the middle frame, the position of the tripod is further set, so that the vertical placement block and the perpendicular bisector of the pile hole are arranged in a superposition mode, then the vertical placement block and the middle frame are lowered, the middle frame is lowered to a certain distance to exert a pressure, the middle frame is in a butting and relatively fixed arrangement with the wall of the pile hole, the vertical placement block is continued to be lowered until the vertical placement block is lowered to be embedded with the positioning head, and thus, the verticality of the pile hole meets the design requirement, and if the vertical placement block and the positioning head are in a staggered arrangement mode, the verticality of the pile hole does not meet the design requirement; like this, realize detecting the verticality in stake hole to, under the effect of middle-placed shelf, avoid hanging down the skew of putting the piece, satisfy the verticality in overlength stake hole and detect the demand.
Drawings
FIG. 1 is a schematic plan view of a high-precision detection device for perpendicularity of an overlong foundation pile hole provided by the utility model;
FIG. 2 is a schematic top view of a tripod of the high-precision verticality detection device for the overlong foundation pile hole provided by the utility model;
FIG. 3 is a schematic cross-sectional view of a mid-mounting frame of the high-precision detection device for perpendicularity of the ultra-long foundation pile hole provided by the utility model;
FIG. 4 is a schematic perspective view of a vertical arrangement structure of the high-precision detection device for perpendicularity of an ultra-long foundation pile hole provided by the utility model;
fig. 5 is a schematic view of a steel reinforcement cage lowering layout of the high-precision detection device for perpendicularity of the overlong foundation pile hole provided by the utility model.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
The following describes the implementation of the present invention in detail with reference to specific embodiments.
The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.
Referring to fig. 1-5, preferred embodiments of the present invention are shown.
The high-precision detection device for the verticality of the overlong foundation pile hole comprises a tripod 1, a middle frame 2, a built-in frame 3 and a vertically-placed structure 4, wherein the tripod 1 is erected right above the pile hole 5, the middle frame 2 is hung to the pile hole 5, the middle frame 2 is arranged to abut against the wall of the pile hole 5, the built-in frame 3 is arranged at the bottom of the pile hole 5, a positioning head is formed in the middle of the built-in frame 3, the upper part of the vertically-placed structure 4 is connected with the tripod 1, and the lower part of the vertically-placed structure 4 penetrates through the middle frame 2 and extends downwards; the vertical placing structure 4 comprises a vertical placing block 41, and a positioning head is vertically embedded in the vertical placing head 41.
When the verticality detection is carried out, the center of the pile hole 5 is confirmed through the middle part of the middle frame 2, the position of the tripod 1 is set again, the vertical placing block 41 and the perpendicular bisector of the pile hole 5 are arranged in a superposition mode, then the vertical placing block 41 and the middle frame 2 are placed downwards, the middle frame 2 is placed downwards to a certain distance to exert pressure, the middle frame is in a conflict and relatively fixed arrangement with the hole wall of the pile hole 5, the vertical placing block 41 is continuously placed downwards until the vertical placing block 41 is placed downwards to be embedded with the positioning head, and therefore the verticality of the pile hole 5 meets the design requirements, and if the vertical placing block 41 and the positioning head are arranged in a staggered mode, the verticality of the pile hole 5 does not meet the design requirements; like this, realize detecting the verticality of stake hole 5 to, under the effect of middle-placed frame 2, avoid hanging down the skew of putting piece 41, satisfy the verticality detection demand of overlength stake hole 5.
The tripod 1 comprises a triangular head 11, a main rod 12 and three auxiliary rods 13, wherein the inner ends of the auxiliary rods 13 are hinged with the triangular head 11, the outer ends of the auxiliary rods 13 are abutted against the outside to enable the triangular head 11 to be suspended, and the three auxiliary rods 13 are correspondingly arranged along the circumference of the triangular head 11 at intervals; thus, the suspended triangular head 11 is convenient for the arrangement of the vertical placing structure 4.
The upper part of the main rod 12 is arranged by penetrating a triangular head 11, and the lower part of the main rod 12 extends vertically towards the pile hole 5; the vertical releasing structure 4 comprises a vertical releasing line 42, the upper part of the vertical releasing line 42 is connected with the triangular head 11, and the lower part of the vertical releasing line 42 penetrates through the main rod 12 to extend and be connected with the vertical releasing block 41.
The main rod 12 is arranged in a hollow manner, so that the vertical wires 42 can penetrate through the main rod 12 to extend downwards, and meanwhile, the main rod 12 plays a role in protecting the vertical wires 42.
The middle rack 2 comprises a first rod and a second rod which are rotatably connected to form a middle part, and the middle part is positioned in the middle; the first placing rods and the second placing rods are arranged in a crisscross manner or in an overlapping manner; the middle part is superposed with the perpendicular bisector of the pile hole 5, and the lower part of the main rod 12 is arranged opposite to the middle part.
Therefore, the first placing rods and the second placing rods are arranged in a crisscross mode, and the center of the pile hole 5 is confirmed through the middle part due to the fact that the middle part is located in the middle.
The first rod and the second rod are arranged in an overlapping mode, so that the central frame 2 can be conveniently stored and carried.
The first rod comprises a first pipe 21 and two first rods 22, two ends of the first pipe 21 are movably connected with the inner ends of the first rods 22, the outer ends of the first rods 22 extend towards the hole wall direction of the pile hole 5, and the first rods 22 and the first pipe 21 are extended or contracted; the second rod comprises a second pipe 23 and two second rod bodies 24, two ends of the second pipe 23 are movably connected with the inner ends of the second rod bodies 24, the outer ends of the second rod bodies 24 extend towards the hole wall direction of the pile hole 5, and the second rod bodies 24 and the second pipe 23 are arranged in an extending or contracting mode.
Thus, when the pile is placed to a specified distance, the first rod body 22 and the first pipe 21 are arranged in an extending mode, and the second rod body 24 and the second pipe 23 are arranged in an extending mode, so that the hole wall of the pile hole 5 is pressed.
The first rod body 22 and the first pipe 21 are driven to extend or contract by a motor, and the second rod body 24 and the second pipe 23 are driven to extend or contract by the motor; thus, the first rod 22 and the first pipe 21 can be controlled to be in an extending or contracting arrangement remotely, and the second rod 24 and the second pipe 23 can be controlled to be in an extending or contracting arrangement remotely.
The middle frame 2 comprises a limiting plate, the limiting plate is connected with the first pipe placing 21 and used for limiting the second pipe placing 23 to rotate continuously, and when the plane of the limiting plate is abutted against the second pipe placing 23, the first pipe placing 21 and the second pipe placing 23 are arranged in a crossed and staggered manner; thus, under the action of the limiting plate, the overlarge rotation amplitude is avoided.
The first pipe placing 21 and the second pipe placing 23 can be driven by a motor to rotate relatively, so that the first pipe placing 21 and the second pipe placing 23 are arranged in a crisscross manner or in an overlapping manner.
The middle frame 2 comprises a plurality of middle plates, the outer end of the first rod body 22 is buckled with or separated from the middle plates, and the outer end of the second rod body 24 is buckled with or separated from the middle plates; the middle-placed plates are arranged in a flat shape, are arranged in an arched arc shape along the direction deviating from the middle-placed plates, and are tiled to abut against the hole wall of the pile hole 5; under the action of each intermediate plate, the contact area between the intermediate plate and the hole wall is increased, and the damage to the hole wall is reduced.
The top of the vertical placing block 41 is provided with a hammering surface which is horizontally arranged, the middle part of the hammering surface forms a positioning part, and the positioning part is arranged along an upward bulge; the bottom of the middle part is provided with a middle surface which is horizontally arranged, the middle surface is provided with a middle groove which is sunken upwards to form the middle groove, and the middle groove is positioned in the middle of the middle surface; when the middle placing frame 2 and the vertical placing block 41 are synchronously hung, the positioning part is embedded with the middle placing groove.
The center of pile hole 5 is first fixed a position out to put frame 2 in the middle, then, put frame 2 and the piece 41 of putting that hangs down in step, under the effect of the piece 41 of putting that hangs down, help put frame 2 to be the level decline, guarantee put the centering of frame 2 in the middle, put frame 2 in the middle and descend to the assigned position, the drive is put frame 2 in the middle and is the extension and arrange, makes put frame 2 in the middle and be the relatively fixed arrangement with the pore wall, the piece 41 that hangs down continues to put, until the piece 41 that hangs down perpendicularly sets up the locating head.
A gyroscope is arranged inside the vertical placing block 41 and used for detecting the horizontal angle of the placing face of the hammer; the gyroscope signal is transmitted to a background server; thus, the downward verticality of the vertically-placing block 41 is detected through the gyroscope, and the downward inclination is avoided to influence the detection result.
The gyroscope adopts a wireless transmission module to transmit signals, avoids wiring in the ultra-long pile hole 5, and avoids the downward placement verticality of the vertical placement block 41 due to the influence of wiring.
The device for detecting the verticality of the overlong pile hole 5 comprises a plurality of distance meters 6, wherein the distance meters 6 are respectively provided with a vertical line 42, each distance meter 6 is coaxially arranged along the distance meter 6 at intervals, and the distance meters 6 are used for detecting the distance between the distance meters 6 and the wall of the pile hole 5; like this, because hang down line 42 and be vertical arrangement, based on the data of each distancer 6 feedback, can assist the verticality of judging stake hole 5, improve the accuracy of detecting.
A distance meter 6 is provided with a vertical placing block 41, and the distance meter 6 and the vertical perpendicular bisector of the vertical placing block 41 are correspondingly arranged; like this, because the distancer 6 of top carries out data contrastive analysis with the distancer 6 of installing at hanging down and putting the piece 41, can assist the verticality of judging stake hole 5, improve the precision of detecting.
The built-in frame 3 comprises a built-in ring and a plurality of connecting rods, the built-in ring is annularly arranged, and the periphery of the built-in ring is abutted against the hole wall of the pile hole 5; one end of the connecting rod is connected with the built-in ring, and the other end of the connecting rod is connected with the positioning head; the built-in ring and the positioning head are coaxially arranged; thus, under the matching action of the built-in ring and each connecting rod, the positioning head is positioned at the center of the bottom of the pile hole 5, and whether the verticality of the pile hole 5 meets the requirement or not is judged according to the position relation between the positioning head and the vertical placing block 41.
The device for detecting the verticality of the overlong pile hole 5 comprises a reinforcement cage 7 and an alignment head 8, wherein the alignment head 8 is arranged at the bottom of the reinforcement cage 7, and the alignment head 8 and the reinforcement cage 7 are coaxially arranged; the middle part of the positioning head is sunken downwards to form a positioning groove, and the positioning groove is embedded in the alignment head 8; therefore, when the reinforcement cage 7 is lowered, the downward vertical property of the reinforcement cage 7 is ensured under the matching action of the alignment head 8 and the positioning head, and the vertical property and the supporting strength of the subsequent pile forming are ensured.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The high-precision detection device for the verticality of the overlong foundation pile hole is characterized by comprising a tripod, a middle frame, a built-in frame and a vertical placement structure, wherein the tripod is erected right above the pile hole, the middle frame is hung and placed in the pile hole and is arranged by abutting against the hole wall of the pile hole, the built-in frame is placed at the bottom of the pile hole, a positioning head is formed in the middle of the built-in frame, the upper part of the vertical placement structure is connected with the tripod, and the lower part of the vertical placement structure penetrates through the middle frame and extends downwards; the vertical placing structure comprises a vertical placing block, and the positioning head is vertically embedded in the vertical placing head.
2. The high-precision detection device for the perpendicularity of the overlong foundation pile hole according to claim 1, wherein the triangular support comprises a triangular head, a main rod and three auxiliary rods, the inner ends of the auxiliary rods are hinged to the triangular head, the outer ends of the auxiliary rods abut against the outside to enable the triangular head to be suspended, and the three auxiliary rods are correspondingly arranged at intervals along the circumference of the triangular head; the upper part of the main rod penetrates through the triangular head, and the lower part of the main rod extends vertically towards the pile hole; the vertical releasing structure comprises a vertical releasing line, the upper part of the vertical releasing line is connected with the triangular head, and the lower part of the vertical releasing line penetrates through the main rod to extend and is connected with the vertical releasing block.
3. The high-precision detection device for the verticality of the overlong foundation pile hole according to claim 2, wherein the middle frame comprises a first placing rod and a second placing rod, the first placing rod and the second placing rod are rotatably connected to form a middle part, and the middle part is positioned in the middle; the first placing rods and the second placing rods are arranged in a crisscross manner or in an overlapping manner; the middle part and the perpendicular bisector of the pile hole are arranged in a superposition mode, and the lower portion of the main rod and the middle part are arranged in a right-to-side mode.
4. The high-precision detecting device for the verticality of the hole of the overlong foundation pile according to claim 3, wherein the first positioning rod comprises a first positioning tube and two first rod bodies, two ends of the first positioning tube are movably connected with the inner end of the first rod body respectively, the outer end of the first rod body extends towards the hole wall of the pile hole, and the first rod body and the first positioning tube are arranged in an extending or contracting way; the second is put the pole and is included the second and put pipe and two second body of rod, the second put the both ends of pipe respectively with the inner of the second body of rod is swing joint and arranges, the outer end orientation of the second body of rod the pore wall direction in stake hole extends to arrange, the second body of rod with the second is put the pipe and is extension or shrink and arrange.
5. The high-precision detection device for the verticality of the overlong foundation pile hole according to claim 4, wherein the middle frame comprises a plurality of middle plates, the outer end of the first rod body is buckled with or separated from the middle plates, and the outer end of the second rod body is buckled with or separated from the middle plates; the middle-placed plate is arranged in a flat shape, the middle-placed plate is arranged in an arched arc shape along the direction deviating from the middle-placed part, and the middle-placed plate is tiled and pressed against the hole wall of the pile hole.
6. The high-precision detection device for the verticality of the overlong foundation pile hole according to claim 3, wherein a hammering surface is arranged at the top of the vertically-placing block, the hammering surface is arranged horizontally, a positioning part is formed in the middle of the hammering surface, and the positioning part is arranged along an upward bulge; the bottom of the middle part is provided with a middle surface which is horizontally arranged, the middle surface is provided with a middle groove which is sunken upwards to form the middle groove, and the middle groove is positioned in the middle of the middle surface; when the middle frame and the vertical block are synchronously hung, the positioning part is embedded with the middle groove.
7. The high-precision detection device for the verticality of the overlong foundation pile hole according to claim 6, wherein a gyroscope is arranged inside the vertical placement block and used for detecting the horizontal angle of the vertical placement surface; and transmitting the gyroscope signal to a background server.
8. The high-precision detecting device for the perpendicularity of the overlong foundation pile hole according to any one of claims 2 to 7, wherein the high-precision detecting device for the perpendicularity of the overlong foundation pile hole comprises a plurality of distance measuring devices, the distance measuring devices are respectively installed on the vertical lines, the distance measuring devices are correspondingly arranged along the distance measuring devices at coaxial intervals, and the distance measuring devices are used for detecting the distance between the distance measuring devices and the wall of the pile hole; the range finder is arranged on the vertical placing block, and the range finder and the perpendicular bisector of the vertical placing block are correspondingly arranged.
9. The high-precision verticality detection device for the overlong foundation pile hole according to any one of claims 1 to 7, wherein the built-in frame comprises a built-in ring and a plurality of connecting rods, the built-in ring is annularly arranged, and the periphery of the built-in ring is arranged in a manner of abutting against the hole wall of the pile hole; one end of the connecting rod is connected with the built-in ring, and the other end of the connecting rod is connected with the positioning head; the built-in ring and the positioning head are coaxially arranged.
10. The high-precision detecting device for the verticality of the overlong foundation pile hole according to claim 9, wherein the high-precision detecting device for the verticality of the overlong foundation pile hole comprises a reinforcement cage and an alignment head, the alignment head is arranged at the bottom of the reinforcement cage, and the alignment head and the reinforcement cage are coaxially arranged; the middle part of the positioning head is sunken downwards to form a positioning groove, and the positioning groove is embedded in the alignment head.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121696451.5U CN215524593U (en) | 2021-07-23 | 2021-07-23 | High-precision detection device for perpendicularity of overlong foundation pile hole |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121696451.5U CN215524593U (en) | 2021-07-23 | 2021-07-23 | High-precision detection device for perpendicularity of overlong foundation pile hole |
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| CN215524593U true CN215524593U (en) | 2022-01-14 |
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| CN202121696451.5U Active CN215524593U (en) | 2021-07-23 | 2021-07-23 | High-precision detection device for perpendicularity of overlong foundation pile hole |
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