CN112302060B - Mechanical sensor assembly and NPR anchor cable multistage self-aligning ball head core penetrating device - Google Patents
Mechanical sensor assembly and NPR anchor cable multistage self-aligning ball head core penetrating device Download PDFInfo
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- CN112302060B CN112302060B CN202010977113.2A CN202010977113A CN112302060B CN 112302060 B CN112302060 B CN 112302060B CN 202010977113 A CN202010977113 A CN 202010977113A CN 112302060 B CN112302060 B CN 112302060B
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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
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
- E02D5/76—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/04—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/10—Miscellaneous comprising sensor means
Abstract
The invention provides a mechanical sensor assembly and an NPR anchor cable multi-stage self-aligning ball head piercing device, wherein the NPR multi-stage anchor cable self-aligning ball head piercing device comprises a middle ball head aligning part; the middle ball head aligning part comprises: a double spherical adjustment member having a middle upper spherical surface and a middle lower spherical surface; the middle upper concave adjusting plate is arranged at the lower end of the first mechanical sensor and is provided with a middle upper arc-shaped concave surface which is matched with the middle upper spherical surface; and the middle part concave adjusting plate is arranged at the upper end of the second mechanical sensor and provided with a middle part lower arc-shaped concave surface which is matched with the middle part lower spherical surface. The device can realize self-aligning of the constant-resistance sleeve, so that the axial direction of the constant-resistance sleeve in the installation process is always consistent with the axial force direction borne by the anchor cable, and the stress measured by the mechanical sensor can truly reflect the stress of the anchor cable.
Description
Technical Field
The invention belongs to NPR (neutral point pressure) anchor cables, and particularly relates to a mechanical sensor assembly and a NPR anchor cable multi-stage self-aligning ball head piercing device.
Background
With the occurrence of a series of engineering geological disasters in recent years, the problem of slope instability is attracting general attention. Due to the influences of geological conditions, natural conditions, human factors and the like, slope instability damage in the fields of construction engineering such as mines, hydropower, roads, railways and the like becomes a common engineering geological disaster, not only influences the engineering progress, but also causes casualties and property loss due to major accidents.
In 2016, the flood academicians put forward that the core problem of the relative motion of 2 blocks is the change of Newton force on a structural belt (surface), and a self-developed Newton force change monitoring and early warning system is utilized to put forward a geological disaster catamaran catastrophe mechanical theory based on a Newton force variation detection method, so that the scientific phenomena of 'sudden drop of Newton force and landslide occurrence' are confirmed, and a theoretical and practical basis is provided for monitoring and early warning of landslide disasters. The Newton force change monitoring and early warning system takes the sufficient necessary condition that the sliding force is greater than the shear strength and the landslide is generated as a basic research concept, takes the mutual mechanical relationship among a slope landslide body, a sliding bed and a monitoring anchor cable as a mechanical basis, and realizes the remote monitoring and early warning of the landslide by monitoring the sliding force and the anti-sliding force in real time. However, the sliding force and the anti-sliding force can not be directly measured generally, a constant-resistance large-deformation anchor cable penetrates through a potential sliding surface between a sliding mass and a sliding bed, so that the sliding mass and the sliding bed are integrated to play a role in supporting, and the axial force of the anchor cable can be measured through a mechanical sensor to realize the sliding force monitoring, which is also called Newton force monitoring.
Because most Newton force monitoring points are installed in remote areas with complex geological conditions, the mechanical sensor damage can cause the set of monitoring equipment to be invalid, and the cost of equipment maintenance is extremely high, two or more mechanical sensors are usually installed to measure the axial force of the anchor cable in the existing Newton force monitoring process, one mechanical sensor is damaged, and the other mechanical sensor can work normally. The multi-stage mechanical sensor is adopted to monitor the axial force of the anchor cable, so that the problem that the axial force monitoring of the anchor cable cannot be normally carried out due to the influence of factors such as environmental condition limitation, high maintenance and replacement cost and the like can be effectively solved.
In the conventional construction process, due to the reasons of complex site construction environment, low technical level of constructors, improper installation of the sensor, uneven anchor pier section, uneven surrounding rock surface and the like, the axial line of the constant-resistance sleeve and the stress direction of the anchor cable are not collinear, namely the axial direction of the mechanical sensor is not consistent with the axial force direction borne by the anchor cable. The axial line of the constant-resistance sleeve is not collinear with the stress direction of the anchor cable, so that the constant-resistance sleeve generates deviation (the axial line of the constant-resistance sleeve tends to be collinear with the stress direction of the anchor cable), the mechanical sensor can be eccentric due to the deviation generated by the constant-resistance sleeve, the stress area of the mechanical sensor is reduced, stress concentration is generated, the accuracy of the detection result of the mechanical sensor is influenced, and the monitoring result is influenced, so that the reliable detection and early warning function of a landslide body cannot be realized.
Therefore, there is a need to provide an improved solution to the above-mentioned deficiencies of the prior art.
Disclosure of Invention
The invention aims to provide a mechanical sensor assembly and an NPR anchor cable multi-stage self-aligning ball head piercing device, and aims to solve the problems that in the prior art, the accuracy of a detection result of a mechanical sensor is not high, and the actual constant resistance value of an NPR anchor cable and a preset constant resistance value have large deviation.
In order to achieve the above purpose, the invention provides the following technical scheme: NPR anchor rope is multistage from aligning bulb device of punching includes: a middle ball head aligning part; the middle ball head aligning part is arranged between the first mechanical sensor and the second mechanical sensor, and the constant-resistance sleeve penetrates through the middle ball head aligning part;
the middle ball head aligning part comprises:
a double spherical adjustment member having a middle upper spherical surface and a middle lower spherical surface;
the middle upper concave adjusting plate is arranged at the lower end of the first mechanical sensor and provided with a middle upper arc-shaped concave surface which is matched with the middle upper spherical surface;
the middle part concave adjusting plate is arranged at the upper end of the second mechanical sensor and provided with a middle part lower arc-shaped concave surface which is matched with the middle part lower spherical surface;
a swinging interval is arranged between the middle upper concave adjusting plate and the middle lower concave adjusting plate along the vertical direction, and when the center-penetrating device is self-aligning, the swinging interval can avoid the interference between the middle upper concave adjusting plate and the middle lower concave adjusting plate;
a first annular adjusting interval is arranged between the inner wall surface of the double-spherical adjusting piece and the outer peripheral surface of the constant-resistance sleeve, and a second annular adjusting interval is arranged between the inner wall surface of the middle-part concave adjusting plate and the outer peripheral surface of the constant-resistance sleeve.
Further, the punching device still includes top bulb aligning part, top bulb aligning part sets up between annular arch and the top mechanics sensor on the constant resistance sleeve pipe, the constant resistance sleeve pipe runs through top bulb aligning part, top bulb aligning part includes:
a top spherical adjuster having a top spherical face;
the top concave adjusting plate is provided with a top arc-shaped concave surface, and the top arc-shaped concave surface is matched with the top spherical surface;
one of the top concave adjusting plate and the top spherical adjusting piece is arranged on an annular bulge on the constant-resistance sleeve, and the other one of the top concave adjusting plate and the top spherical adjusting piece is arranged on a top mechanical sensor closest to the annular bulge;
a third annular adjusting interval is formed between the top concave adjusting plate or the top spherical adjusting piece arranged on the top mechanical sensor and the outer peripheral surface of the constant-resistance sleeve;
a fourth annular adjusting interval is arranged between the inner wall surface of the concave adjusting plate on the middle part and the outer peripheral surface of the constant-resistance sleeve;
preferably, the outer side of the top arc-shaped concave surface is provided with a top annular plane;
preferably, where the top spherical adjustment is provided on an annular projection on the constant resistance sleeve;
the upper end of the top spherical adjusting piece is provided with an annular groove, the radial size of the annular groove is matched with that of the annular bulge, and the annular bulge is inserted into the annular groove.
Further, the punching device still includes bottom bulb aligning part, bottom bulb aligning part sets up between annular backing plate and the bottom mechanics sensor that is closest to annular backing plate, the internal face of bottom bulb aligning part with fifth annular adjustment interval has between the sheathed tube outer peripheral face of constant resistance, the constant resistance sleeve pipe runs through bottom bulb aligning part, bottom bulb aligning part includes:
a bottom spherical adjustment member having a bottom spherical surface;
the bottom concave adjusting plate is provided with a bottom arc-shaped concave surface, and the bottom arc-shaped concave surface is matched with the bottom spherical surface;
one of the bottom spherical adjusting piece and the bottom concave adjusting plate is arranged at the bottom of the bottom mechanical sensor, and the other one of the bottom spherical adjusting piece and the bottom concave adjusting plate is arranged at the top of the annular base plate;
preferably, the outer side of the lower arc-shaped concave surface is provided with a lower annular plane.
Further, balls are arranged between the double-spherical adjusting piece and the middle upper concave adjusting plate as well as between the double-spherical adjusting piece and the middle lower concave adjusting plate, the double-spherical adjusting piece is in rolling fit with the middle upper concave adjusting plate, and the double-spherical adjusting piece is in rolling fit with the middle lower concave adjusting plate;
preferably, the spherical surface under the middle part of two spherical adjustment pieces all is provided with the recess on spherical surface under and the middle part, the ball sets up in the recess, the ball that spherical surface embedding on the middle part protrusion in spherical surface 2mm on the middle part, the ball that spherical surface embedding under the middle part protrusion in spherical surface 2mm under the middle part.
Further, balls are arranged between the top spherical adjusting piece and the top concave adjusting plate and between the bottom spherical adjusting piece and the bottom concave adjusting plate,
the top spherical adjusting piece and the top concave adjusting plate are in rolling fit with the bottom spherical adjusting piece and the bottom concave adjusting plate;
preferably, the top spherical surface of the top spherical adjusting member and the bottom spherical surface of the bottom spherical adjusting member are both provided with grooves, the balls are arranged in the grooves, the balls embedded in the top spherical surface protrude 2mm from the top spherical surface, and the balls embedded in the bottom spherical surface protrude 2mm from the bottom spherical surface.
Further, the outer profiles of the cross sections of the bottom spherical adjusting piece, the top spherical adjusting piece and the double spherical adjusting piece are all circular.
Furthermore, the outer contours of the cross sections of the middle upper concave adjusting plate, the middle lower concave adjusting plate, the top concave adjusting plate and the bottom concave adjusting plate are all circular.
Further, the width of the third annular adjustment interval is 2mm, and the widths of the first annular adjustment interval, the second annular adjustment interval, the fourth annular adjustment interval, and the fifth annular adjustment interval are all 4 mm.
Further, the curvature of the middle upper spherical surface is equal to that of the middle lower spherical surface.
A mechanical sensor assembly comprising:
the mechanical sensor is provided with at least two mechanical sensors, and the constant-resistance sleeve penetrates through the mechanical sensors;
NPR anchor rope is multistage from aligning bulb device of punching includes: a middle ball head aligning part; the middle ball head aligning part is arranged between the first mechanical sensor and the second mechanical sensor, and the constant-resistance sleeve penetrates through the middle ball head aligning part;
the middle ball head aligning part comprises:
a double spherical adjustment member having a middle upper spherical surface and a middle lower spherical surface;
the middle upper concave adjusting plate is arranged at the lower end of the first mechanical sensor and provided with a middle upper arc-shaped concave surface which is matched with the middle upper spherical surface;
the middle part concave adjusting plate is arranged at the upper end of the second mechanical sensor and provided with a middle part lower arc-shaped concave surface which is matched with the middle part lower spherical surface;
a swinging interval is arranged between the middle upper concave adjusting plate and the middle lower concave adjusting plate along the vertical direction, and when the center-penetrating device is self-aligning, the swinging interval can avoid the interference between the middle upper concave adjusting plate and the middle lower concave adjusting plate;
a first annular adjusting interval is arranged between the inner wall surface of the double-spherical adjusting piece and the outer peripheral surface of the constant-resistance sleeve, and a second annular adjusting interval is arranged between the inner wall surface of the middle concave adjusting plate and the outer peripheral surface of the constant-resistance sleeve;
and a middle ball head aligning part in the NPR anchor cable multi-stage self-aligning ball head penetrating device is arranged between the two adjacent mechanical sensors.
Further, the punching device still includes top bulb aligning part, top bulb aligning part sets up between annular arch and the top mechanics sensor on the constant resistance sleeve pipe, the constant resistance sleeve pipe runs through top bulb aligning part, top bulb aligning part includes:
a top spherical adjuster having a top spherical face;
the top concave adjusting plate is provided with a top arc-shaped concave surface, and the top arc-shaped concave surface is matched with the top spherical surface;
one of the top concave adjusting plate and the top spherical adjusting piece is arranged on an annular bulge on the constant-resistance sleeve, and the other one of the top concave adjusting plate and the top spherical adjusting piece is arranged on a top mechanical sensor closest to the annular bulge;
a third annular adjusting interval is formed between the top concave adjusting plate or the top spherical adjusting piece arranged on the top mechanical sensor and the outer peripheral surface of the constant-resistance sleeve;
a fourth annular adjusting interval is arranged between the inner wall surface of the concave adjusting plate on the middle part and the outer peripheral surface of the constant-resistance sleeve;
preferably, the outer side of the top arc-shaped concave surface is provided with a top annular plane;
preferably, where the top spherical adjustment is provided on an annular projection on the constant resistance sleeve;
the upper end of the top spherical adjusting piece is provided with an annular groove, the radial size of the annular groove is matched with that of the annular bulge, and the annular bulge is inserted into the annular groove.
Further, the punching device still includes bottom bulb aligning part, bottom bulb aligning part sets up between annular backing plate and the bottom mechanics sensor that is closest to annular backing plate, the internal face of bottom bulb aligning part with fifth annular adjustment interval has between the sheathed tube outer peripheral face of constant resistance, the constant resistance sleeve pipe runs through bottom bulb aligning part, bottom bulb aligning part includes:
a bottom spherical adjustment member having a bottom spherical surface;
the bottom concave adjusting plate is provided with a bottom arc-shaped concave surface, and the bottom arc-shaped concave surface is matched with the bottom spherical surface;
one of the bottom spherical adjusting piece and the bottom concave adjusting plate is arranged at the bottom of the bottom mechanical sensor, and the other one of the bottom spherical adjusting piece and the bottom concave adjusting plate is arranged at the top of the annular base plate;
preferably, the outer side of the lower arc-shaped concave surface is provided with a lower annular plane.
Further, balls are arranged between the double-spherical adjusting piece and the middle upper concave adjusting plate as well as between the double-spherical adjusting piece and the middle lower concave adjusting plate, the double-spherical adjusting piece is in rolling fit with the middle upper concave adjusting plate, and the double-spherical adjusting piece is in rolling fit with the middle lower concave adjusting plate;
preferably, the spherical surface under the middle part of two spherical adjustment pieces all is provided with the recess on spherical surface under and the middle part, the ball sets up in the recess, the ball that spherical surface embedding on the middle part protrusion in spherical surface 2mm on the middle part, the ball that spherical surface embedding under the middle part protrusion in spherical surface 2mm under the middle part.
Further, balls are arranged between the top spherical adjusting piece and the top concave adjusting plate and between the bottom spherical adjusting piece and the bottom concave adjusting plate,
the top spherical adjusting piece and the top concave adjusting plate are in rolling fit with the bottom spherical adjusting piece and the bottom concave adjusting plate;
preferably, the top spherical surface of the top spherical adjusting member and the bottom spherical surface of the bottom spherical adjusting member are both provided with grooves, the balls are arranged in the grooves, the balls embedded in the top spherical surface protrude 2mm from the top spherical surface, and the balls embedded in the bottom spherical surface protrude 2mm from the bottom spherical surface.
Further, the outer profiles of the cross sections of the bottom spherical adjusting piece, the top spherical adjusting piece and the double spherical adjusting piece are all circular.
Furthermore, the outer contours of the cross sections of the middle upper concave adjusting plate, the middle lower concave adjusting plate, the top concave adjusting plate and the bottom concave adjusting plate are all circular.
Further, the width of the third annular adjustment interval is 2mm, and the widths of the first annular adjustment interval, the second annular adjustment interval, the fourth annular adjustment interval, and the fifth annular adjustment interval are all 4 mm.
Further, the curvature of the middle upper spherical surface is equal to that of the middle lower spherical surface.
Compared with the closest prior art, the technical scheme provided by the invention at least has the following beneficial effects:
1) the method aims at the problems that when a mechanical sensor of a side slope Newton force remote monitoring and early warning system is installed, the axial direction of a constant-resistance sleeve cannot be consistent with the axial force direction borne by an anchor cable, so that the stress area of a detection end of the mechanical sensor is smaller when prestress is applied to the anchor cable, and finally the stress measured by the mechanical sensor cannot reflect the real stress of the constant-resistance large-deformation anchor cable. The invention provides a mechanical sensor assembly and an NPR anchor cable multistage self-aligning ball head core penetrating device, which can realize self-aligning of a constant-resistance sleeve, so that the axial direction of the constant-resistance sleeve in the installation process is always consistent with the axial force direction borne by an anchor cable, and further, the stress measured by a mechanical sensor can truly reflect the stress of the anchor cable.
2) The invention can be applied to the problems of slope instability support, landslide monitoring and early warning and the like in the construction engineering fields of mines, hydropower, highways, railways, national defense, industrial and civil construction and the like, and has wide application range.
3) The invention can solve the problems that the axial force borne by the mechanical sensor axis and the NPR anchor cable is not on the same straight line, the mechanical sensor is eccentric when stressed, the stress area of the mechanical sensor is reduced, stress concentration is generated, and the mechanical sensor can not accurately measure the axial force value of the NPR anchor cable due to the reasons that the field construction environment is complex, the technical level of constructors is not high, the mechanical sensor is not completely vertical to the anchor pier during drilling, the mechanical sensor is not installed in place, the cross section of the anchor pier is not flat, the surface of the anchor pier is not vertical to the axis of the anchor cable, the surface of surrounding rock is not flat, and the like.
4) The invention can realize the automatic axial adjustment of the constant-resistance sleeve, ensure that the axial force direction of the anchor cable after being tensioned is consistent with the axial line of the constant-resistance sleeve in the tensioning process, and ensure that the NPR anchor cable can play the normal performance.
5) The invention mainly aims to ensure the contact area between the constant-resistance sleeve and the mechanical sensor and between the mechanical sensor and the annular base plate when the stress direction of the anchor cable deviates from the axis of the constant-resistance sleeve, ensure the complete coupling between the multi-stage mechanical sensors and between the mechanical sensor and the anchor pier, and avoid the over-concentration of stress on the mechanical sensor, thereby ensuring the reliability of the detection result.
6) The secondary purpose of the invention is to adjust the axis of the constant-resistance sleeve (the stress direction of the anchor cable is not adjustable), so that the axis is collinear with the stress direction of the anchor cable, ensure that the NPR anchor cable works in a preset state (namely the force applied by the constant-resistance body is collinear with the axial direction of the constant-resistance body), ensure that the axis of the mechanical sensor is consistent with the axial force applied to the constant-resistance large-deformation anchor cable when the anchor cable passes through the sliding surface and is connected with the sliding mass and the sliding bed and prestress is applied, namely ensure that the actual constant-resistance value of the NPR anchor cable does not generate large deviation with the preset constant-resistance value, and further ensure the reinforcing effect of the NPR anchor cable on the sliding mass.
7) The invention has simple operation and high installation efficiency in the actual installation process.
8) The accident that the sensor is eccentrically damaged or the stress of the three chords is unbalanced due to the fact that the plane of the sensor base plate is not parallel to the outer end face of the anchor pier in the actual installation process is solved.
9) The middle ball head aligning part is used as a coupling device of two mechanical sensors, when prestress is applied to a giant anchor cable, the direction of the middle upper concave adjusting plate and the middle lower concave adjusting plate can be automatically adjusted under the action of force, so that the axis of the constant-resistance sleeve and the axis of the anchor cable are always kept on the same straight line, the inner wall of the mechanical sensor is completely attached to the sleeve of the constant-resistance anchor cable, eccentricity is prevented, and the accuracy of the axial force of the anchor cable measured by the mechanical sensor is ensured.
10) The constant-resistance sleeve and the mechanical sensor are fixed by applying prestress on the NPR giant anchor cable, when the tension stress is eccentric, the direction of the multistage self-aligning ball head piercing coupling device can be automatically adjusted along with the change of the force no matter whether the axial force direction of the mechanical sensor and the axial force direction of the anchor cable are changed in a wrong way, the stress directions of the constant-resistance sleeve and the anchor cable are always kept on the same straight line, and the stress direction of the mechanical sensor is always along the axial line of the mechanical sensor, so that the mechanical sensor is always kept accurate in measurement.
11) The stress direction between the mechanical sensor and the anchor pier and between the mechanical sensors is automatically adjusted in the anchor cable stretching process, so that the axis of the constant-resistance sleeve after stretching and the axial force borne by the NPR anchor cable are on the same straight line, and the accuracy of the NPR anchor cable axial force measured by the sensors is ensured.
Drawings
FIG. 1 is a schematic diagram of a mechanical sensor assembly according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view taken at A-A of FIG. 1;
FIG. 3 is an enlarged view at B in FIG. 2;
FIG. 4 is an enlarged view at C of FIG. 2;
FIG. 5 is an enlarged view taken at D in FIG. 2;
fig. 6 is a schematic view of the combination of the dual spherical adjustment member, the centrally recessed adjustment plate and the balls of fig. 1.
In the figure: 1. a constant resistance bushing; 2. an annular projection; 3. a top spherical adjustment; 4. a top concave adjusting plate; 5. a first kinematic sensor; 6. the middle part is provided with a concave adjusting plate; 7. a double spherical adjustment member; 8. the middle part is provided with a concave adjusting plate; 9. a second mechanical sensor; 10. a bottom spherical adjustment member; 11. a bottom concave adjusting plate; 12. an annular backing plate; 13. and a ball.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
As shown in fig. 1 to 6, the invention provides a mechanical sensor assembly, and relates to a landslide geological disaster Newton force remote monitoring and early warning system based on an NPR anchor cable technology in the field of slope engineering.
The orifice of the drill hole is provided with an annular base plate 12, the outer diameter of the annular base plate 12 is consistent with the diameter of the inner wall of the drill hole, and the annular base plate 12 is additionally arranged on the lower portion of the bottom concave adjusting plate 11, so that the mechanical sensor can be tightly attached to the constant-resistance sleeve 1, the mechanical sensor and the hole wall of the drill hole, and the mechanical sensor can measure the axial force of the anchor cable more accurately.
A first annular interval is arranged between the inner wall surface of the annular cushion plate 12 and the outer peripheral surface of the constant-resistance sleeve 1, and the width of the first annular interval can be adjusted according to actual use conditions. In the following embodiments, the width of the first annular gap is 4mm, i.e. the inner diameter of the annular pad 12 is 8mm larger than the outer diameter of the constant resistance sleeve 1.
The mechanical sensor assembly comprises a mechanical sensor and an NPR anchor cable multi-stage self-aligning ball head core penetrating device. The mechanical sensor is provided with at least two constant-resistance sleeves 1 penetrating through the mechanical sensor. If there are a plurality of mechanics sensors, need to be provided with a plurality of middle part bulb aligning parts, and the quantity of mechanics sensor is one more than the quantity of middle part bulb aligning part, all is provided with middle part bulb aligning part in two adjacent mechanics sensors promptly. In the embodiment, two mechanical sensors are taken as an example, wherein the upper mechanical sensor is called as a first mechanical sensor 5, and the lower mechanical sensor is called as a second mechanical sensor 9; in this embodiment, for example, the mechanical sensor assembly is provided with two mechanical sensors, the first mechanical sensor 5 is a top mechanical sensor, and the second mechanical sensor 9 is a bottom mechanical sensor.
The NPR anchor rope multistage self-aligning ball head core penetrating device comprises a top ball head aligning part, a middle ball head aligning part and a bottom ball head aligning part.
The middle ball head aligning part is arranged between the first mechanical sensor 5 and the second mechanical sensor 9, the constant-resistance sleeve 1 penetrates through the middle ball head aligning part, and the middle ball head aligning part comprises a double-spherical adjusting piece 7, a middle upper concave adjusting plate 6 and a middle lower concave adjusting plate 8.
The double spherical adjusting member 7 has a middle upper spherical surface and a middle lower spherical surface, the convex direction of the middle upper spherical surface is toward the middle upper concave adjusting plate 6, and the convex direction of the middle lower spherical surface is toward the middle lower concave adjusting plate 8. Preferably, the curvature of the middle upper spherical surface is equal to the curvature of the middle lower spherical surface.
The middle upper concave adjusting plate 6 is arranged at the lower end of the first mechanical sensor 5, the middle upper concave adjusting plate 6 is provided with a middle upper arc-shaped concave surface, and the middle upper arc-shaped concave surface is similar to and matched with the curvature of the middle upper spherical surface. The middle part concave adjusting plate 8 is arranged at the upper end of the second mechanical sensor 9, the middle part concave adjusting plate 8 is provided with a middle part lower arc concave surface, and the curvature of the middle part lower arc concave surface is similar to and matched with that of the middle part lower spherical surface. The swinging interval is arranged between the middle upper concave adjusting plate 6 and the middle lower concave adjusting plate 8 along the up-down direction, and when the center-penetrating device is self-aligning, the swinging interval can avoid the interference between the middle upper concave adjusting plate 6 and the middle lower concave adjusting plate 8.
A first annular adjusting interval is arranged between the inner wall surface of the double-spherical adjusting piece 7 and the outer peripheral surface of the constant-resistance sleeve 1, and a second annular adjusting interval is arranged between the inner wall surface of the middle concave adjusting plate 8 and the outer peripheral surface of the constant-resistance sleeve 1; a fourth annular adjusting interval is arranged between the inner wall surface of the concave adjusting plate 6 on the middle part and the outer peripheral surface of the constant-resistance sleeve 1. The widths of the first annular adjusting interval, the second annular adjusting interval and the fourth annular adjusting interval are all 4 mm. In other embodiments, the outer side of the middle lower arc-shaped concave surface is provided with a middle lower annular plane, the outer side of the middle upper arc-shaped concave surface is provided with a middle upper annular plane, so that a sharp corner with a smaller angle can be prevented from being generated, and the sharp corner with the smaller angle is easy to deform and damage, thereby influencing the matching of the spherical surface and the arc-shaped concave surface.
The spherical surface on the middle part of two spherical adjusting parts 7 all is provided with the recess on spherical surface under and the middle part, is provided with ball 13 in the recess, and the ball 13 that sets up on the spherical surface on the middle part rolls with spill adjusting plate 6 on the middle part and cooperates, and ball 13 that the spherical surface set up under the middle part is used for rolling with the concave adjusting plate 8 in the middle part and cooperates. Preferably, the ball 13 that the spherical surface set up in the middle part protrudes spherical surface 2mm on the middle part, and the ball 13 that spherical surface embedding under the middle part protrudes spherical surface 2mm under the middle part, can better play the slip effect when the stretch-draw atress, full play self-aligning effect makes the axis of constant resistance sleeve pipe 1 and the axial force direction that the anchor rope receives remain on a straight line all the time, ensures the accuracy that mechanical sensor measurationed. And lubricant is smeared between the middle upper spherical surface and the middle upper arc-shaped concave surface and between the middle lower spherical surface and the middle lower arc-shaped concave surface, so that the central part of the ball head can better play a role in regulation.
The axes of the double-spherical adjusting piece 7, the middle upper concave adjusting plate 6 and the middle lower concave adjusting plate 8 are provided with through holes for the giant anchor cable, the constant-resistance sleeve 1 and the mechanical sensor to pass through, so that the aligning function can be better played. The outer contour of the cross section of the double-spherical adjusting piece 7 is circular, and the outer contour of the cross section of the middle upper concave adjusting plate 6 and the cross section of the middle lower concave adjusting plate 8 are both circular.
The top bulb aligning part is arranged between the annular protrusion 2 on the constant-resistance sleeve 1 and the top mechanical sensor, the constant-resistance sleeve 1 penetrates through the top bulb aligning part, and the top bulb aligning part comprises a top spherical adjusting piece 3 and a top concave adjusting plate 4.
The top spherical adjustment member 3 has a top spherical surface, the convex direction of which is directed toward the top concave adjustment plate 4. The top concave adjusting plate 4 is provided with a top arc concave surface, and the curvature of the top arc concave surface is similar to and matched with that of the top spherical surface. The axis of the top spherical adjusting piece 3 passing through the spherical center of the top spherical surface and the axis of the top concave adjusting plate 4 passing through the spherical center of the top arc-shaped concave surface are respectively provided with a through hole for the giant anchor cable, the constant-resistance sleeve 1 and the mechanical sensor to pass through, so that the aligning function is better played. The spherical surface of top is provided with the recess, is provided with ball 13 in the recess, and the ball 13 that the spherical surface of top was inlayed is used for rolling fit with top spill adjusting plate 4. Preferably, the ball 13 arranged on the top spherical surface protrudes 2mm from the top spherical surface. Preferably, a lubricant is coated between the top spherical surface and the top arc-shaped concave surface, so that the top ball head aligning part can better play a role in adjustment. One of the top concave adjusting plate 4 and the top spherical adjusting piece 3 is arranged on the annular bulge 2 on the constant-resistance sleeve 1, and the other is arranged on the top mechanical sensor; a third annular adjusting interval is arranged between the top concave adjusting plate 4 or the top spherical adjusting piece 3 arranged on the top mechanical sensor and the outer peripheral surface of the constant-resistance sleeve 1, and the width of the third annular adjusting interval is 2 mm. In this embodiment, the top concave adjusting plate 4 is disposed on the top mechanical sensor, the top spherical adjusting member 3 is disposed on the annular protrusion 2 of the constant-resistance sleeve 1, and the annular protrusion 2 and the constant-resistance sleeve 1 are integrally formed. Specifically, the method comprises the following steps: the upper end of the top spherical adjusting piece 3 is provided with an annular groove, the radial dimension of the annular groove is equal to that of the annular bulge 2, and the annular bulge 2 is inserted into the annular groove.
In other embodiments, the outer contour of the cross section of the top concave adjusting plate 4 is circular, and the outer side of the top arc-shaped concave surface is provided with a top annular plane, so that the advantage is that the edge of the top concave adjusting plate 4 is prevented from generating a sharp angle with a smaller angle, and the sharp angle with the smaller angle is easy to deform and damage, thereby affecting the matching of the top arc-shaped concave surface and the top spherical surface. The outer profile of the cross section of the top spherical adjustment member 3 is circular.
The bottom ball aligning part is arranged between the annular base plate 12 and a bottom mechanical sensor closest to the annular base plate 12, a fifth annular adjusting interval is arranged between the inner wall surface of the bottom ball aligning part and the outer peripheral surface of the constant-resistance sleeve 1, the width of the fifth annular adjusting interval is 4mm, and the constant-resistance sleeve 1 penetrates through the bottom ball aligning part. The bottom ball head aligning part comprises a bottom spherical adjusting piece 10 and a bottom concave adjusting plate 11, the axis of the bottom spherical adjusting piece 10 passing through the spherical center of the bottom spherical surface and the axis of the bottom concave adjusting plate 11 passing through the spherical center of the bottom arc-shaped concave surface are respectively provided with a through hole for the giant anchor cable, the constant-resistance sleeve 1 and the mechanical sensor to pass through, so that the aligning effect is better exerted. The bottom spherical adjustment member 10 has a bottom spherical surface, the convex direction of which is directed toward the bottom concave adjustment plate 11. The bottom concave adjusting plate 11 is provided with a bottom arc concave surface, and the curvature of the bottom arc concave surface is similar to and matched with that of the bottom spherical surface. Preferably, the bottom spherical surface is provided with a groove, a ball 13 is arranged in the groove, and the ball 13 embedded in the bottom spherical surface is used for being matched with the bottom concave adjusting plate 11 in a rolling mode. Preferably, the balls 13 provided on the bottom spherical surface protrude from the bottom spherical surface by 2mm, and the balls 13 are all steel balls. And a lubricant is smeared between the spherical surface at the bottom and the arc-shaped concave surface at the bottom, so that the spherical part of the ball head at the bottom can better play a role in adjusting. One of the bottom spherical adjustment member 10 and the bottom concave adjustment plate 11 is disposed at the bottom of the bottom mechanical sensor, and the other is disposed at the top of the annular pad 12. In this embodiment, the bottom spherical adjusting member 10 is disposed at the bottom of the bottom mechanical sensor, and the bottom concave adjusting plate 11 is disposed at the top of the annular pad 12. Preferably, the outer contour of the cross section of the bottom concave adjusting plate 11 is circular, and the outer contour of the cross section of the bottom spherical adjusting member 10 is circular. In other embodiments, the outer side of the lower arc-shaped concave surface has a lower annular plane, which has the advantage of avoiding the edge of the bottom concave adjusting plate 11 from generating a sharp corner with a smaller angle, and the sharp corner with the smaller angle is easy to deform and damage, thereby affecting the matching of the bottom arc-shaped concave surface and the bottom spherical surface.
When NPR anchor cables are installed on the surfaces of different anchor piers or surrounding rocks, spherical surfaces with different protruding degrees can be used as a core penetrating device formed by combining a spherical surface adjusting piece and a concave adjusting plate, so that the self-aligning coupling effect can be fully exerted under different environmental conditions.
The technical scheme of the sensor assembly is that a top ball aligning part, a middle ball aligning part and a bottom ball aligning part are adopted to replace a traditional sensor base plate, so that multi-stage self-alignment is realized.
Based on the theoretical foundation, the traditional drilling construction process is adopted, drilling operation is carried out according to specific engineering design schemes and construction requirements of tunnels, roadways, slopes and the like, and the hole forming standard needs to meet specific requirements of aperture and hole depth.
When the giant NPR anchor cable is installed, the giant NPR anchor cable is sequentially installed according to a bottom concave adjusting plate 11, a bottom spherical adjusting piece 10, an annular gasket, a second mechanical sensor 9, an annular gasket, a middle part concave adjusting plate 8, a double spherical adjusting piece 7, a middle part upper concave adjusting plate 6, an annular gasket, a first mechanical sensor 5, an annular gasket, a top concave adjusting plate 4 and a top spherical adjusting piece 3. Then the constant-resistance sleeve 1 is sleeved into the mechanical sensor components which are installed in the sequence, and then the constant-resistance sleeve 1 and the mechanical sensor components are inserted into the drill hole together. The constant-resistance body is sleeved into the anchor cable, the clamping piece is additionally arranged between the constant-resistance body and the anchor cable, and finally the constant-resistance body is inserted into the constant-resistance sleeve 1, and the constant-resistance body is ensured to be in mutual coupling contact with the anchor cable and the constant-resistance body and the constant-resistance sleeve 1. And anchoring the NPR anchor cable anchoring section by adopting a resin explosive roll or high-pressure grouting.
When the anchor pier is poured, the surface of the anchor pier is required to be vertical to the axis of the anchor cable, and when the strength of the anchor pier reaches over 80 percent of the design strength, the prestressed tensioning operation can be carried out. Before the anchor cable is formally tensioned, 10-20% of design tensioning load is adopted, and the anchor cable is pre-tensioned for 1-2 times, so that all parts of the anchor cable are tightly contacted and completely straight, and eccentricity is avoided to the greatest extent.
When the anchor cable is stressed, the annular bulge 2 at the upper part of the sleeve and the middle upper concave adjusting plate 6 clamp the first mechanical sensor 5, the middle lower concave adjusting plate 8 and the annular base plate 12 clamp the second mechanical sensor 9, and the first mechanical sensor 5 and the second mechanical sensor 9 respectively detect the stress of the cable. In the tensioning process, the NPR giant anchor cable is prestressed to fix the constant-resistance sleeve 1, the first mechanical sensor 5 and the second mechanical sensor 9, and no matter whether the axial force direction of the constant-resistance sleeve 1 is inconsistent with the axial force direction of the anchor cable, the angle is automatically adjusted through the NPR anchor cable multi-stage self-aligning ball head piercing device, so that the direction of the NPR anchor cable multi-stage self-aligning ball head piercing device is consistent.
The specific embodiment of the NPR anchor cable multistage self-aligning ball head piercing device is the same as the structure of the NPR anchor cable multistage self-aligning ball head piercing device in the mechanical sensor assembly, and the details are not repeated.
In conclusion, compared with the prior art, the mechanical sensor assembly and the NPR anchor cable multistage self-aligning ball head core penetrating device adopted by the invention have the following technical effects:
1) the method aims at the problems that when a mechanical sensor of a side slope Newton force remote monitoring and early warning system is installed, the axial direction of a constant-resistance sleeve cannot be consistent with the axial force direction borne by an anchor cable, so that the stress area of a detection end of the mechanical sensor is smaller when prestress is applied to the anchor cable, and finally the stress measured by the mechanical sensor cannot reflect the real stress of the constant-resistance large-deformation anchor cable. The invention provides a mechanical sensor assembly and an NPR anchor cable multistage self-aligning ball head core penetrating device, which can realize self-aligning of a constant-resistance sleeve, so that the axial direction of the constant-resistance sleeve in the installation process is always consistent with the axial force direction borne by an anchor cable, and further, the stress measured by a mechanical sensor can truly reflect the stress of the anchor cable.
2) The invention can be applied to the problems of slope instability support, landslide monitoring and early warning and the like in the construction engineering fields of mines, hydropower, highways, railways, national defense, industrial and civil construction and the like, and has wide application range.
3) The invention can solve the problems that the axial force borne by the mechanical sensor axis and the NPR anchor cable is not on the same straight line, the mechanical sensor is eccentric when stressed, the stress area of the mechanical sensor is reduced, stress concentration is generated, and the mechanical sensor can not accurately measure the axial force value of the NPR anchor cable due to the reasons that the field construction environment is complex, the technical level of constructors is not high, the mechanical sensor is not completely vertical to the anchor pier during drilling, the mechanical sensor is not installed in place, the cross section of the anchor pier is not flat, the surface of the anchor pier is not vertical to the axis of the anchor cable, the surface of surrounding rock is not flat, and the like.
4) The invention can realize the automatic axial adjustment of the constant-resistance sleeve, ensure that the axial force direction of the anchor cable after being tensioned is consistent with the axial line of the constant-resistance sleeve in the tensioning process, and ensure that the NPR anchor cable can play the normal performance.
5) The invention mainly aims to ensure the contact area between the constant-resistance sleeve and the mechanical sensor and between the mechanical sensor and the annular base plate when the stress direction of the anchor cable deviates from the axis of the constant-resistance sleeve, ensure the complete coupling between the multi-stage mechanical sensors and between the mechanical sensor and the anchor pier, and avoid the over-concentration of stress on the mechanical sensor, thereby ensuring the reliability of the detection result.
6) The secondary purpose of the invention is to adjust the axis of the constant-resistance sleeve (the stress direction of the anchor cable is not adjustable), so that the axis is collinear with the stress direction of the anchor cable, ensure that the NPR anchor cable works in a preset state (namely the force applied by the constant-resistance body is collinear with the axial direction of the constant-resistance body), ensure that the axis of the mechanical sensor is consistent with the axial force applied to the constant-resistance large-deformation anchor cable when the anchor cable passes through the sliding surface and is connected with the sliding mass and the sliding bed and prestress is applied, namely ensure that the actual constant-resistance value of the NPR anchor cable does not generate large deviation with the preset constant-resistance value, and further ensure the reinforcing effect of the NPR anchor cable on the sliding mass.
7) The invention has simple operation and high installation efficiency in the actual installation process.
8) The accident that the sensor is eccentrically damaged or the stress of the three chords is unbalanced due to the fact that the plane of the sensor base plate is not parallel to the outer end face of the anchor pier in the actual installation process is solved.
9) The middle ball head aligning part is used as a coupling device of two mechanical sensors, when prestress is applied to a giant anchor cable, the direction of the upper concave adjusting plate and the direction of the middle lower concave adjusting plate can be automatically adjusted under the action of force, so that the axis of the constant-resistance sleeve and the axis of the anchor cable are always kept on the same straight line, the inner wall of the mechanical sensor is completely attached to the sleeve of the constant-resistance anchor cable, eccentricity is prevented, and the accuracy of the axial force of the anchor cable measured by the mechanical sensor is ensured.
10) The constant-resistance sleeve and the mechanical sensor are fixed by applying prestress on the NPR giant anchor cable, when the tension stress is eccentric, the direction of the multistage self-aligning ball head piercing coupling device can be automatically adjusted along with the change of the force no matter whether the axial force direction of the mechanical sensor and the axial force direction of the anchor cable are changed in a wrong way, the stress directions of the constant-resistance sleeve and the anchor cable are always kept on the same straight line, and the stress direction of the mechanical sensor is always along the axial line of the mechanical sensor, so that the mechanical sensor is always kept accurate in measurement.
11) The stress direction between the mechanical sensor and the anchor pier and between the mechanical sensors is automatically adjusted in the anchor cable stretching process, so that the axis of the constant-resistance sleeve after stretching and the axial force borne by the NPR anchor cable are on the same straight line, and the accuracy of the NPR anchor cable axial force measured by the sensors is ensured. The invention is not to be considered as limited to the particular embodiments shown, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
- The multistage self-aligning ball head core penetrating device for the NPR anchor cable is characterized in that:the method comprises the following steps: a middle ball head aligning part; the middle ball head aligning part is arranged between the first mechanical sensor and the second mechanical sensor, and the constant-resistance sleeve penetrates through the middle ball head aligning part;the middle ball head aligning part comprises:a double spherical adjustment member having a middle upper spherical surface and a middle lower spherical surface;the middle upper concave adjusting plate is arranged at the lower end of the first mechanical sensor and provided with a middle upper arc-shaped concave surface which is matched with the middle upper spherical surface;the middle part concave adjusting plate is arranged at the upper end of the second mechanical sensor and provided with a middle part lower arc-shaped concave surface which is matched with the middle part lower spherical surface;a swinging interval is arranged between the middle upper concave adjusting plate and the middle lower concave adjusting plate along the vertical direction, and when the center-penetrating device is self-aligning, the swinging interval can avoid the interference between the middle upper concave adjusting plate and the middle lower concave adjusting plate;a first annular adjusting interval is arranged between the inner wall surface of the double-spherical adjusting piece and the outer peripheral surface of the constant-resistance sleeve, and a second annular adjusting interval is arranged between the inner wall surface of the middle concave adjusting plate and the outer peripheral surface of the constant-resistance sleeve;the punching device further comprises a top ball head aligning part, the top ball head aligning part is arranged between an annular bulge on the constant-resistance sleeve and the top mechanical sensor, the constant-resistance sleeve runs through the top ball head aligning part, and the top ball head aligning part comprises:a top spherical adjuster having a top spherical face;the top concave adjusting plate is provided with a top arc-shaped concave surface, and the top arc-shaped concave surface is matched with the top spherical surface;one of the top concave adjusting plate and the top spherical adjusting piece is arranged on an annular bulge on the constant-resistance sleeve, and the other one of the top concave adjusting plate and the top spherical adjusting piece is arranged on a top mechanical sensor closest to the annular bulge;a third annular adjusting interval is formed between the top concave adjusting plate or the top spherical adjusting piece arranged on the top mechanical sensor and the outer peripheral surface of the constant-resistance sleeve;a fourth annular adjusting interval is arranged between the inner wall surface of the concave adjusting plate on the middle part and the outer peripheral surface of the constant-resistance sleeve;in the case where the top spherical adjustment is provided on an annular projection on the constant resistance sleeve;the upper end of the top spherical adjusting piece is provided with an annular groove, the radial size of the annular groove is matched with that of the annular bulge, and the annular bulge is inserted into the annular groove;the punching device further comprises a bottom ball head aligning part, the bottom ball head aligning part is arranged between the annular base plate and a bottom mechanical sensor closest to the annular base plate, a fifth annular adjusting interval is arranged between the inner wall surface of the bottom ball head aligning part and the outer peripheral surface of the constant-resistance sleeve, the constant-resistance sleeve penetrates through the bottom ball head aligning part, and the bottom ball head aligning part comprises:a bottom spherical adjustment member having a bottom spherical surface;the bottom concave adjusting plate is provided with a bottom arc-shaped concave surface, and the bottom arc-shaped concave surface is matched with the bottom spherical surface;one of the bottom spherical adjusting piece and the bottom concave adjusting plate is arranged at the bottom of the bottom mechanical sensor, and the other one of the bottom spherical adjusting piece and the bottom concave adjusting plate is arranged at the top of the annular base plate;balls are arranged between the double-spherical adjusting piece and the middle upper concave adjusting plate and between the double-spherical adjusting piece and the middle lower concave adjusting plate, the double-spherical adjusting piece is in rolling fit with the middle upper concave adjusting plate, and the double-spherical adjusting piece is in rolling fit with the middle lower concave adjusting plate;balls are arranged between the top spherical adjusting piece and the top concave adjusting plate and between the bottom spherical adjusting piece and the bottom concave adjusting plate,the top spherical adjusting piece is in rolling fit with the top concave adjusting plate, and the bottom spherical adjusting piece is in rolling fit with the bottom concave adjusting plate;the curvature of the middle upper spherical surface is equal to that of the middle lower spherical surface.
- 2. The NPR anchor cable multistage self-aligning ball head piercing device of claim 1, characterized in that: the outer side of the top arc concave surface is provided with a top annular plane.
- 3. The NPR anchor cable multistage self-aligning ball head piercing device as claimed in claim 2, wherein: the outer side of the lower arc-shaped concave surface is provided with a lower annular plane.
- 4. The NPR anchor cable multistage self-aligning ball head piercing device of claim 1, characterized in that: all be provided with the recess on spherical surface and the spherical surface under the middle part of two spherical adjusting parts, the ball sets up in the recess, the ball protrusion of spherical surface embedding on the middle part in spherical surface 2mm on the middle part, the ball protrusion of spherical surface embedding under the middle part in spherical surface 2mm under the middle part.
- 5. The NPR anchor cable multistage self-aligning ball head piercing device as claimed in claim 3, wherein: the spherical surface in top with the spherical adjustment piece in bottom all be provided with the recess on the spherical surface in bottom, the ball sets up in the recess, the ball of the spherical surface embedding in top 2mm, the ball of the spherical surface embedding in bottom 2 mm.
- 6. The NPR anchor cable multistage self-aligning ball head piercing device as claimed in claim 3, wherein: the bottom spherical adjusting piece, the top spherical adjusting piece and the double spherical adjusting piece are all circular in outer profile of cross section.
- 7. The NPR anchor cable multistage self-aligning ball head piercing device as claimed in claim 3, wherein: the outer contours of the cross sections of the middle upper concave adjusting plate, the middle lower concave adjusting plate, the top concave adjusting plate and the bottom concave adjusting plate are all circular.
- 8. The NPR anchor cable multistage self-aligning ball head piercing device as claimed in claim 3, wherein: the width of the third annular adjusting interval is 2mm, and the widths of the first annular adjusting interval, the second annular adjusting interval, the fourth annular adjusting interval and the fifth annular adjusting interval are 4 mm.
- 9. Mechanical sensor subassembly, its characterized in that: the method comprises the following steps:the mechanical sensor is provided with at least two mechanical sensors, and the constant-resistance sleeve penetrates through the mechanical sensors;the NPR anchor cable multistage self-aligning ball head punching device is the NPR anchor cable multistage self-aligning ball head punching device as claimed in any one of claims 1 to 8; and a middle ball head aligning part in the NPR anchor cable multi-stage self-aligning ball head penetrating device is arranged between the two adjacent mechanical sensors.
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| CN206987854U (en) * | 2017-03-06 | 2018-02-09 | 山东科技大学 | A kind of aligning recoverable anchor rod for increasing anchoring strength |
| CN210152696U (en) * | 2019-04-16 | 2020-03-17 | 北京中矿新峰科技有限公司 | Constant-resistance anchor cable |
| CN210368981U (en) * | 2019-06-17 | 2020-04-21 | 中铁东方国际集团有限公司 | Prestressed anchorage cable stretch-draw deviation correcting device |
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