CN112211233B - Detection device for pile foundation - Google Patents
Detection device for pile foundation Download PDFInfo
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- CN112211233B CN112211233B CN202010924819.2A CN202010924819A CN112211233B CN 112211233 B CN112211233 B CN 112211233B CN 202010924819 A CN202010924819 A CN 202010924819A CN 112211233 B CN112211233 B CN 112211233B
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- pile foundation
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
Abstract
The application discloses a detection device for a pile foundation, which relates to the field of pile foundation detection and comprises a mounting seat arranged on the upper end surface of the pile foundation and a portal frame crossing the pile foundation; the vertical installation pole that is provided with on the mount pad, the both sides of installation pole all are provided with the first laser pen of aiming at the portal frame both sides inner wall to the both sides inner wall of portal frame all is provided with the first light curtain that has the scale. The application has the following advantages and effects: through setting up the succinct structure to detection device easy and simple to handle when guaranteeing pile foundation settlement stable detection, also realizes the nondestructive test of pile foundation.
Description
Technical Field
The application relates to a pile foundation detection field, in particular to a detection device for a pile foundation.
Background
The pile foundation is a deep foundation consisting of piles and pile bearing platforms connected with the pile tops or a single pile foundation connected with the pile foundation through columns. If the pile body is completely buried in the soil and the bottom surface of the bearing platform is contacted with the soil body, the pile body is called a low bearing platform pile foundation; when the upper part of the pile body is exposed out of the ground and the bottom of the pile cap is positioned above the ground, the pile body is called a high pile cap pile foundation.
Chinese patent CN107447795A discloses a pile foundation detection device, it includes the jack, bears the frame, from boring stock, stock fixing machine and pile foundation settlement appearance, bears frame fixed connection from boring stock, and the jack basement is in test pile top, and the jack top is in bearing the frame below, and pile foundation settlement appearance is used for measuring test pile settlement data.
When the detection device in the related art is used, a drilling machine is needed to drill the self-drilling anchor rod into the ground, and then the pile foundation is detected after all parts are spliced and fixed. However, when the detection device in the related art is used, a jack needs to be used for increasing pressure on the pile foundation, so that the damage to the pile foundation is easily caused, and the improvement is needed.
Disclosure of Invention
In order to realize the nondestructive test of pile foundation, the application aims to provide a detection device for pile foundation.
The application provides a detection device for pile foundation adopts following technical scheme: a detection device for a pile foundation comprises a mounting seat arranged on the upper end surface of the pile foundation and a portal frame crossing the pile foundation; the vertical installation pole that is provided with on the mount pad, the both sides of installation pole all are provided with the alignment the first laser pen of portal frame both sides inner wall, and the both sides inner wall of portal frame all is provided with the first light curtain that has the scale.
Through adopting above-mentioned technical scheme, when using above-mentioned detection device, place the mount pad in the up end of pile foundation, place the portal frame on subaerial simultaneously, make the portal frame span the pile foundation, make first laser pen aim at and shine first light curtain simultaneously, record the light spot position of first laser pen this moment. And after a period of time, observing the change of the light spot position, thereby judging whether the pile foundation is settled. Therefore, the structure is simple, the detection device is simple and convenient to operate, and the nondestructive detection of the pile foundation is realized while the stable detection of the pile foundation settlement is ensured.
Optionally: the up end of installation pole is provided with the second laser pen, the portal frame is improved level and is provided with the second light curtain that has the scale, and the second light curtain is located directly over the second laser pen.
Through adopting above-mentioned technical scheme, when placing the mount pad, the position of adjustment mount pad makes the second laser pen shine the central point of second light curtain and puts. Therefore, whether the pile foundation deviates in the horizontal direction or not can be judged according to whether the position of the light spot of the second laser pen changes or not. Consequently through the cooperation that increases second laser pen and second light curtain, when subsiding the detection to the pile foundation, realize the detection of pile foundation horizontal migration, realize detection device's multi-functional detection promptly, improve detection device's practicality simultaneously.
Optionally: the mount pad includes hemispherical casing, the lower extreme outer wall of casing is provided with a plurality of stabilizer blades, the lower extreme of installation pole is provided with to inlay and locates spheroid in the casing, the spheroid with the mutual ball joint of casing, the spheroid is the setting of cavity form, and spheroidal lower extreme inner wall is provided with the balancing weight.
Through adopting above-mentioned technical scheme, when placing the mount pad in the up end of pile foundation, under the combined action of the casing of ball joint and spheroid, make spheroid and installation pole can the free rotation. Therefore no matter whether the up end of pile foundation levels, can all reduce spheroidal focus position under the additional action of balancing weight to the position of automatic adjustment installation pole makes the installation pole be in vertical state all the time, guarantees promptly that the position of first laser pen and second laser pen can not receive the influence of pile foundation surface roughness, realizes that the pile foundation subsides and the stable detection and the short-term test of horizontal migration, improves detection efficiency and detection precision.
Optionally: the improved ball body structure is characterized in that a concave cavity is formed in the center of the bottom wall of the shell, supports are arranged at two ends of the concave cavity, a supporting rod is hinged to each support, a push rod is arranged at one end, deviating from each other, of each supporting rod, a rubber pad used for pressing the outer wall of the ball body is arranged on each push rod, and a driving mechanism used for controlling the supporting rod to turn is arranged in the concave cavity.
By adopting the technical scheme, after the positions of the ball body and the mounting rod are automatically adjusted, the driving mechanism is utilized to control one end of the pair of supporting rods, which is close to each other, to move downwards, and at the moment, the lever principle is utilized to drive the ejector rod to turn upwards. When the rubber pad on the ejector pin compresses tightly spheroidal outer wall, realize the locking of spheroid and installation pole and fix. Consequently, compress tightly spheroidal outer wall through setting up controllable ejector pin and rubber pad, realize that the locking of spheroid and installation pole is fixed, avoid external factor drive spheroid and installation pole motion, consequently improve detection device's accuracy and precision.
Optionally: actuating mechanism is including setting up in a pair of electro-magnet between the support, it is a pair of the one end that branch is close to each other all articulates there is the actuating lever, and is a pair of the actuating lever deviates from it has the connecting rod to articulate between the one end of branch, the connecting rod is located directly over the electro-magnet and be used for by the electro-magnet adsorbs.
Through adopting above-mentioned technical scheme, when fixing the spheroid, to the electro-magnet circular telegram, the electro-magnet adsorbs the connecting rod this moment to under the effect of articulated actuating lever, drive branch drives the synchronous upset of ejector pin, realizes that spheroidal compressing tightly is fixed. When the fixing of the sphere is released, the electromagnet is powered off, and the adsorption force of the electromagnet on the connecting rod is released, so that the pressing force of the ejector rod and the rubber pad on the sphere is released, and the fixing of the sphere is released. Therefore, stable turnover control of the supporting rod and the ejector rod is achieved by arranging the driving mechanism which is simple to operate, and stable locking and quick locking of the ball body are achieved.
Optionally: the portal frame comprises a pair of vertically arranged upright posts, and a cross beam is horizontally arranged between the upper ends of the upright posts; the center position of the lower end face of the cross beam is provided with a spherical shell with an opening at the lower end, the center position of the upper end face of the second light curtain is vertically provided with an adjusting rod, and the upper end of the adjusting rod is provided with an adjusting ball embedded into the spherical shell.
Through adopting above-mentioned technical scheme, when placing the portal frame on the ground, through the cooperation of spherical shell and adjusting ball for the second light curtain can freely rotate. Therefore no matter whether a pair of stand is in same horizontal plane, can all be under the gravity auxiliary action of second light curtain, the position of automatic adjustment second light curtain makes the second light curtain be in the horizontality all the time, guarantees promptly that the accurate cooperation with the second laser pen can not receive the influence of ground surface roughness to realize the stable detection and the short-term test of pile foundation horizontal migration, improve detection efficiency and detection precision.
Optionally: the crossbeam with the central point of spherical shell puts and runs through the screw that is provided with mutual intercommunication, the interior vertical threaded connection of screw has the screw rod, the upper end of screw rod is provided with the hand wheel, and the lower extreme is provided with and is used for compressing tightly the flexible pad of adjusting the ball outer wall.
Through adopting above-mentioned technical scheme, after the position automatic adjustment of second light curtain finishes, slow rotating hand wheel drives screw rod and flexible pad synchronous revolution to make the flexible pad be close to and compress tightly the outer wall of adjusting the ball, realize that the locking of adjusting ball and second light curtain is fixed. Therefore, the adjusting ball and the second light curtain can be prevented from being driven to move by external factors, and the accuracy and precision of the detection device are improved.
Optionally: the stand include with the body that the crossbeam is connected and vertical sliding connection in the body of rod of body, the outer wall threaded connection of body has the butterfly bolt that is used for compressing tightly the body of rod outer wall.
Through adopting above-mentioned technical scheme, when detecting the pile foundation of co-altitude not, the butterfly bolt is loosened soon, then the pulling body of rod slides, and the butterfly bolt of screwing afterwards fixes the body of rod, realizes the quick adjustment of stand length. Therefore, the detection of pile foundations with different heights is realized by arranging the upright columns with adjustable length and convenient adjustment, and the effect of high adaptability is achieved.
Optionally: the vertical constant head tank that is provided with of lower terminal surface of the body of rod, vertical sliding connection has the pilot pin in the constant head tank, the vertical intercommunication that is provided with of outer wall of the body of rod the groove of sliding of constant head tank, the upper end outer wall of pilot pin is provided with wears to establish the slide bar in groove of sliding, and be provided with the footboard on the slide bar.
Through adopting above-mentioned technical scheme, when placing the stand in subaerial, drive slide bar and the synchronous downstream of pilot pin through stepping on and pressing the footboard, make the pilot pin pierce into in the ground to realize the stand and even whole portal frame's fixed, stability when the increase portal frame used guarantees the stable detection of pile foundation.
In summary, the present application includes at least one of the following beneficial technical effects:
1. by arranging the detection device which is simple in structure and convenient to operate, the nondestructive detection of the pile foundation is realized while the stable detection of the pile foundation settlement is ensured;
2. by increasing the matching of the second laser pen and the second light curtain, the detection of horizontal deviation of the pile foundation is realized while the settlement of the pile foundation is detected, namely, the multifunctional detection of the detection device is realized, and meanwhile, the practicability of the detection device is improved;
3. by arranging the mounting seat capable of automatically adjusting the balance position and the working position, the positions of the mounting rod, the first laser pen and the second laser pen are ensured not to be influenced by the surface flatness of the pile foundation, stable detection and quick detection of pile foundation settlement and horizontal offset are realized, and the detection efficiency and the detection precision are improved;
4. the outer wall of the sphere is tightly pressed by arranging the controllable ejector rod and the rubber pad, so that the sphere and the mounting rod are locked and fixed, and the sphere and the mounting rod are prevented from being driven to move by external factors, so that the accuracy and precision of the detection device are improved;
5. through setting up the balanced second light curtain of automatically regulated, guarantee that the second light curtain is in the horizontality all the time, guarantee promptly can not receive the influence of ground surface roughness with the accurate cooperation of second laser pen to realize the stable detection and the short-term test of pile foundation horizontal migration, improve detection efficiency and detection precision.
Drawings
FIG. 1 is a schematic structural view of an embodiment;
FIG. 2 is a schematic structural diagram of a gantry of an embodiment;
FIG. 3 is a schematic view of the connection relationship between the cross beam and the second light curtain of the embodiment;
FIG. 4 is a schematic structural view of a mount of an embodiment;
fig. 5 is a schematic structural view of the housing of the embodiment.
Reference numerals: 1. a mounting seat; 11. a housing; 12. a support leg; 13. a sphere; 14. a balancing weight; 15. a concave cavity; 16. a support; 17. a strut; 18. a top rod; 19. a rubber pad; 2. a gantry; 21. a first light curtain; 22. a second light curtain; 23. a column; 24. a cross beam; 25. a pipe body; 26. a rod body; 261. positioning a groove; 262. a positioning pin; 263. a sliding groove; 264. a slide bar; 265. a pedal; 27. a butterfly bolt; 3. mounting a rod; 31. a first laser pen; 32. a second laser pen; 4. a spherical shell; 41. a screw hole; 42. a screw; 43. a hand wheel; 44. a flexible pad; 5. adjusting a rod; 51. adjusting the ball; 6. a drive mechanism; 61. an electromagnet; 62. a drive rod; 63. a connecting rod.
Detailed Description
The present application is described in further detail below with reference to the attached drawings.
As shown in fig. 1, a detection device for pile foundation, including mount pad 1 and portal frame 2, mount pad 1 is used for placing in the up end of pile foundation, and portal frame 2 is used for placing in ground and striding over the pile foundation to vertically be provided with installation pole 3 on mount pad 1.
As shown in fig. 1, both sides of the installation rod 3 are provided with first laser pens 31 aligned with both side inner walls of the gantry 2, and both side inner walls of the gantry 2 are provided with first light curtains 21 with scales.
As shown in fig. 1, the upper end surface of the mounting rod 3 is provided with a second laser pointer 32, the gantry 2 is horizontally provided with a second light curtain 22 with scales, and the second light curtain 22 is located right above the second laser pointer 32.
When the detection device is used, the portal frame 2 is placed on the ground, so that the portal frame 2 stretches across the pile foundation, and meanwhile, the portal frame 2 is fixed on the ground. Then the mounting base 1 is placed on the upper end face of the pile foundation, and the first laser pen 31 is aligned with and irradiates the first light curtain 21, and the second laser pen 32 irradiates the central position of the second light curtain 22.
The spot positions of the first and second laser pens 31, 32 are recorded at this time, and after a certain time, the changes of the spot positions of the first and second laser pens 31, 32 are observed. If the light spot of the first laser pen 31 changes, the pile foundation subsides, otherwise, the pile foundation does not subside. If the light spot of the second laser pointer 32 changes, the pile foundation horizontally shifts, otherwise, the pile foundation does not horizontally shift.
As shown in fig. 2, the gantry 2 includes a pair of vertically arranged columns 23, and a beam 24 is horizontally arranged between upper ends of the pair of columns 23. The upright 23 comprises a tube 25 connected with the beam 24 and a rod 26 vertically and slidably connected with the tube 25, and a butterfly bolt 27 for pressing the outer wall of the rod 26 is connected with the outer wall of the tube 25 in a threaded manner.
When pile foundations of different heights are detected, the butterfly bolt 27 is unscrewed, and then the rod body 26 is pulled to slide outwards or inwards. When the length of the rod body 26 and the length of the pipe body 25 accord with the height of the pile foundation, the butterfly bolt 27 is screwed to fix the rod body 26, so that the length of the upright 23 can be quickly adjusted, and the detection of the pile foundations with different heights can be realized.
As shown in fig. 2, a positioning groove 261 is vertically disposed on the lower end surface of the rod 26, and a positioning pin 262 is vertically slidably connected in the positioning groove 261. The outer wall of the rod body 26 is vertically provided with a sliding groove 263 communicated with the positioning groove 261, and the outer wall of the upper end of the positioning needle 262 is provided with a sliding rod 264. The sliding rod 264 is arranged outside the rod body 26 after penetrating the sliding groove 263, and a pedal 265 is arranged at one end of the sliding rod 264 outside the rod body 26.
When the upright 23 is placed on the ground, the sliding rod 264 and the positioning needle 262 are driven to synchronously move downwards by stepping on the pedal 265, so that the positioning needle 262 is penetrated into the ground. Thereby realize stand 23 and even whole portal frame 2 fixed, stability when increase portal frame 2 uses guarantees the stable detection of pile foundation.
As shown in fig. 2 and 3, a spherical shell 4 with an open lower end is arranged at the center of the lower end surface of the cross beam 24, an adjusting rod 5 is vertically arranged at the center of the upper end surface of the second light curtain 22, and an adjusting ball 51 embedded in the spherical shell 4 and in ball joint with the spherical shell 4 is arranged at the upper end of the adjusting rod 5.
When the portal frame 2 is placed on the ground, the second light curtain 22 can rotate freely through the cooperation of the spherical shell 4 and the adjusting ball 51. Therefore, the position of the second light sheet 22 can be automatically adjusted by the gravity assistance of the second light sheet 22 no matter whether the pair of columns 23 are at the same horizontal plane or not.
The second light curtain 22 is therefore always horizontal, i.e. it is ensured that the exact fit with the second laser pointer 32 is not affected by the flatness of the ground surface. Therefore, stable detection and rapid detection of horizontal migration of the pile foundation are achieved, and detection efficiency and detection precision are improved.
As shown in fig. 3, screw holes 41 are formed through the cross beam 24 and the center of the spherical shell 4, and screws 42 are connected to the screw holes 41 vertically. The upper end of the screw rod 42 is provided with a hand wheel 43, and the lower end is provided with a flexible pad 44 for pressing the outer wall of the adjusting ball 51.
After the position of the second light curtain 22 is automatically adjusted, the hand wheel 43 is slowly rotated to drive the screw rod 42 and the flexible pad 44 to synchronously rotate, and the flexible pad 44 is close to and presses the outer wall of the adjusting ball 51, so that the adjusting ball 51 and the second light curtain 22 are locked and fixed. Therefore, the movement of the adjusting ball 51 and the second light curtain 22 driven by external factors can be avoided, thereby improving the accuracy and precision of the detection device.
As shown in fig. 4, the mounting base 1 includes a hemispherical housing 11, a plurality of support legs 12 are disposed on an outer wall of a lower end of the housing 11, and a ball 13 embedded in the housing 11 is disposed on a lower end of the mounting rod 3. Sphere 13 and casing 11 ball joint each other, and sphere 13 is the hollow setting to the lower extreme inner wall of sphere 13 is provided with balancing weight 14.
When the mounting base 1 is placed on the upper end face of a pile foundation, the ball 13 and the mounting rod 3 can rotate freely under the cooperation of the ball joint shell 11 and the ball 13. Therefore, no matter whether the upper end surface of the pile foundation is flat or not, the gravity center position of the ball body 13 can be lowered under the auxiliary action of the balancing weight 14, and the position of the mounting rod 3 can be automatically adjusted.
Thus, the mounting rod 3 is always in a vertical state, i.e. the positions of the first laser pointer 31 and the second laser pointer 32 are guaranteed not to be affected by the flatness of the surface of the pile foundation. The stable detection and the rapid detection of the pile foundation settlement and the horizontal deviation are realized, and the detection efficiency and the detection precision are improved.
As shown in fig. 4 and 5, a cavity 15 is formed at a central position of the bottom wall of the housing 11, and brackets 16 are provided at both ends of the cavity 15. The support 16 is hinged with a support rod 17, and one end of the pair of support rods 17, which is far away from each other, is provided with a mandril 18.
As shown in fig. 4 and 5, a rubber pad 19 for pressing the outer wall of the ball 13 is provided on the top bar 18, and a driving mechanism 6 for controlling the turning of the supporting rod 17 is provided in the cavity 15.
After the positions of the ball 13 and the mounting rod 3 are automatically adjusted, the driving mechanism 6 is used for controlling one end of the pair of supporting rods 17, which is close to each other, to move downwards, and at the moment, the lever principle is used for driving the mandril 18 to turn upwards. Until the rubber pad 19 on the top rod 18 presses the outer wall of the sphere 13, the sphere 13 and the mounting rod 3 are locked and fixed. Thereby preventing external factors from driving the ball 13 and the mounting rod 3 to move, and thus improving the accuracy and precision of the detection device.
As shown in fig. 4 and 5, the driving mechanism 6 includes an electromagnet 61 disposed between the pair of brackets 16, and one ends of the pair of support rods 17 close to each other are each hinged with a driving rod 62. A connecting rod 63 is hinged between the ends of the pair of driving rods 62 departing from the supporting rod 17, and the connecting rod 63 is positioned right above the electromagnet 61 and is used for being adsorbed by the electromagnet 61.
When the sphere 13 is fixed, the electromagnet 61 is electrified, the electromagnet 61 adsorbs the connecting rod 63, and the driving rod 62 is hinged to drive the supporting rod 17 to drive the ejector rod 18 to synchronously turn over, so that the sphere 13 is pressed and fixed.
When the fixing of the spherical body 13 is released, the electromagnet 61 is de-energized, and at this time, the attraction force of the electromagnet 61 to the connecting rod 63 is released, and the pressing force of the plunger 18 and the rubber pad 19 to the spherical body 13 is released, thereby releasing the fixing of the spherical body 13.
The working principle is as follows: when the detection device works, the portal frame 2 is placed on the ground, and the portal frame 2 stretches across the pile foundation. Then the mounting base 1 is placed on the upper end face of the pile foundation, and the first laser pen 31 is aligned with and irradiates the first light curtain 21, and the second laser pen 32 irradiates the central position of the second light curtain 22. At this time, the light spot positions of the first laser pen 31 and the second laser pen 32 are recorded, and after a period of time, the changes of the light spot positions of the first laser pen 31 and the second laser pen 32 are observed to judge whether the pile foundation is settled or not and to judge whether the pile foundation is horizontally offset.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (6)
1. The utility model provides a detection device for pile foundation which characterized in that: comprises a mounting seat (1) arranged on the upper end surface of a pile foundation and a portal frame (2) crossing the pile foundation;
a mounting rod (3) is vertically arranged on the mounting base (1), first laser pens (31) which are aligned with the inner walls of the two sides of the portal frame (2) are arranged on the two sides of the mounting rod (3), and first light curtains (21) with scales are arranged on the inner walls of the two sides of the portal frame (2);
a second laser pen (32) is arranged on the upper end face of the mounting rod (3), a second light curtain (22) with scales is horizontally arranged on the portal frame (2), and the second light curtain (22) is positioned right above the second laser pen (32);
the mounting seat (1) comprises a hemispherical shell (11), a plurality of support legs (12) are arranged on the outer wall of the lower end of the shell (11), a ball body (13) embedded in the shell (11) is arranged at the lower end of the mounting rod (3), the ball body (13) and the shell (11) are mutually in ball joint, the ball body (13) is arranged in a hollow shape, and a balancing weight (14) is arranged on the inner wall of the lower end of the ball body (13);
the central point of casing (11) diapire puts and is provided with cavity (15), the both ends of cavity (15) all are provided with support (16), it has branch (17) to articulate on support (16), and is a pair of the one end that branch (17) deviate from each other is provided with ejector pin (18), be provided with on ejector pin (18) and be used for compressing tightly rubber pad (19) of spheroid (13) outer wall, and be provided with in cavity (15) and be used for control actuating mechanism (6) of branch (17) upset.
2. The pile foundation detection device according to claim 1, wherein: actuating mechanism (6) are including setting up in a pair electromagnet (61) between support (16), and is a pair of branch (17) one end that is close to each other all articulates there is actuating lever (62), and is a pair of actuating lever (62) deviate from it has connecting rod (63) to articulate between the one end of branch (17), connecting rod (63) are located directly over electromagnet (61) and be used for by electromagnet (61) adsorb.
3. The pile foundation detection device according to claim 1, wherein: the portal frame (2) comprises a pair of vertically arranged upright posts (23), and a cross beam (24) is horizontally arranged between the upper ends of the upright posts (23);
the central point of terminal surface puts and is provided with lower extreme open-ended spherical shell (4) under crossbeam (24), the central point of second light curtain (22) up end puts vertical regulation pole (5) of being provided with, the upper end of adjusting pole (5) is provided with the embedding regulation ball (51) in spherical shell (4).
4. The pile foundation detection device according to claim 3, wherein: crossbeam (24) with the central point of spherical shell (4) puts and runs through screw (41) that are provided with intercommunication each other, the interior vertical threaded connection of screw (41) has screw rod (42), the upper end of screw rod (42) is provided with hand wheel (43), and the lower extreme is provided with and is used for compressing tightly flexible pad (44) of adjusting ball (51) outer wall.
5. The pile foundation detection device according to claim 3, wherein: the upright column (23) comprises a pipe body (25) connected with the cross beam (24) and a rod body (26) vertically connected with the pipe body (25) in a sliding mode, and butterfly bolts (27) used for pressing the outer wall of the rod body (26) are connected to the outer wall of the pipe body (25) in a threaded mode.
6. The pile foundation detection device according to claim 5, wherein: the vertical constant head tank (261) that is provided with of lower terminal surface of the body of rod (26), vertical sliding connection has location needle (262) in constant head tank (261), the vertical intercommunication that is provided with of outer wall of the body of rod (26) the groove (263) that slides of constant head tank (261), the upper end outer wall of location needle (262) is provided with wears to establish slide bar (264) of groove (263) that slides, and be provided with footboard (265) on slide bar (264).
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| CN202010924819.2A CN112211233B (en) | 2020-09-05 | 2020-09-05 | Detection device for pile foundation |
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| CN202010924819.2A CN112211233B (en) | 2020-09-05 | 2020-09-05 | Detection device for pile foundation |
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