LU502902B1

LU502902B1 - Anti-seismic pre-stressed anchor rod for real-time pre-tigntening/warning

Info

Publication number: LU502902B1
Application number: LU502902A
Authority: LU
Inventors: Bin Tan; Qingling Li; Gang Wang; Liangqing Wang; Hongjie Chen; Jianlin Tian; Linfeng Zhu
Original assignee: Huaneng Group Tech Innovation Center Co Ltd; Huaneng Lancang River Hydropower Inc; Univ China Geosciences Wuhan
Priority date: 2021-10-25
Filing date: 2022-10-14
Publication date: 2023-04-18
Also published as: CN114032890A

Abstract

The present invention relates to the technical field of geotechnical engineering protection, and in particular to an anti-seismic pre-stressed anchor rod for real-time pre-tightening/warning. The anti-seismic pre-stressed anchor rod for real-time pre-tightening/warning includes a pull rod, a sleeve head, a bearing plate, and a traction wire. The pull rod is provided with a “U”-shaped structure cavity corresponding to the traction wire along an axial direction, the traction wire passes through the “U”-shaped structure cavity and the sleeve head in sequence, and outer ends are fixedly connected to form a ring shape; the bearing plate is slidably connected to the pull rod; the sleeve head is fixedly connected to the bearing plate through a driving part; the sleeve head is driven by the bearing plate to move in the axial direction; and a lower end of the anchor rod penetrates deep into the interior of bedrock. The present invention can resist destructive effect of an earthquake to a certain extent, and the pre-tightening effect of the anchor rod before the earthquake may be achieved by tensioning the traction wire and tightening the sleeve head under the condition that pre-stress is relaxed after the earthquake; and the stability of the anchoring slope can also be analyzed by detecting the strength of extended traction wires and timely warning whether the anchor rod has failed.

Description

ANTI-SEISMIC PRE-STRESSED ANCHOR ROD FOR REAL-TIME LU502902

PRE-TIGNTENING/WARNING

BACKGROUNG OF THE INVENTION

1. Technical Field

The present invention relates to the technical field of geotechnical engineering protection, and in particular to an anti-seismic pre-stressed anchor rod for real-time pre-tightening/warning. 2. Description of Related Art

In the field of geotechnical engineering, anchor rods, as one of the most effective of supporting forms, are widely used in the fields of engineering such as slopes and tunnels. A pre-stressed anchor rod is a type of anchor rod structure, and the supporting effect is achieved by anchoring dangerous rock mass or slipping mass on bedrock.

During the supporting process, a pre-stress needs to be applied to maintain the balance of the dangerous rock mass or the slipping mass. When subjected to external force, the slipping mass is tightly pulled on the bedrock through a combined action of anchor rod-mortar interfacial force and the anchor head.

In the field of engineering, an anchoring structure is subjected to various forces, some of which are relatively small dynamic actions that may be resisted and maintained stable by anchoring force of the anchor rod itself. However, because many projects are located on seismic belts with frequent earthquakes, the anchoring structure is subjected to relatively big seismic dynamic action. When subjected to a strong earthquake, the anchoring structure will resist at first, and then the anchor rod-mortar interface of the anchoring end will gradually debond, and finally be completely destroyed. At the same time, because of unobservability of the interior of the anchor rod, it cannot be predicted whether the anchor rod fails or not, and whether LU502902 the anchor rod still plays the anchoring effect. Therefore, it is necessary to take measures, on the one hand, to resist and dissipate the seismic action; and on the other hand, to reflect the internal anchoring effect to the external anchor head, and then analyze the stability of slope.

SUMMARY

To solve the above problems, the present invention provides an anti-seismic pre-stressed anchor rod for real-time pre-tightening/warning.

An anti-seismic pre-stressed anchor rod for real-time pre-tightening/warning, comprising: a pull rod, a sleeve head, a bearing plate, and at least two traction wires, wherein the pull rod is provided with a cavity of a “U”-shaped structure corresponding to the traction wire, the cavity is arranged along the axial direction of the pull rod, a plurality of cavities are arranged symmetrically along the axis line of the pull rod, and central axes of the plurality of cavities are located on the same horizontal line, and the bottoms thereof are in communication with each other; the traction wires are arranged in the corresponding cavities, and two ends thereof protrude the cavities; the bearing plate is sleeved outside the pull rod and is slidably connected to an outer wall of the pull rod; and the sleeve head is slidably mounted on the upper end of the pull rod, and a fixed part is arranged on the top thereof, two ends of the traction wires pass through the sleeve head and the fixed part in sequence, and are slidably connected to the fixed part; the fixed part is used for fixing the traction wires; the sleeve head is fixedly connected to the bearing plate through a driving part, and under the external force, the bearing LU502902 plate drives the driving part to drive the sleeve head to move along the pull rod in an axial direction.

Further, the bottom of the pull rod is coaxially provided with a drill bit in hemispherical or conical structure.

Further, the upper end of the pull rod is coaxially provided with an accommodating cavity.

Further, the driving part is a spring, the spring is sleeved on the upper part of the pull rod, and two ends thereof are fixedly connected to the bearing plate and the sleeve head respectively.

Further, the fixed part comprises a brake buffer ring and a wire harness ring, the brake buffer ring and the wire harness ring are arranged on the top of the sleeve head from top to bottom in sequence, the wire harness ring is fixedly connected to the brake buffer ring and to the sleeve head respectively, and the two ends of the traction wires pass through the wire harness ring and the brake buffer ring in sequence, and are connected and fixed.

Further, a third through-hole assembly and a fourth through-hole assembly corresponding to the traction wires are arranged on the wire harness ring and the brake buffer ring respectively, and the two ends of the traction wires pass through the corresponding third through-hole assembly and the fourth through-hole assembly in sequence.

Further, the third through-hole assembly is provided with two third through-holes, and the fourth through-hole assembly is provided with two fourth through-hole in circular truncated cone shape, and the third through-holes and the fourth through-holes are symmetrically arranged along the axis line of the pull rod.

Further, a second through-hole is provided in the middle of the bearing plate, the LU502902 upper end of the pull rod passes through the second through-hole, and a gap is provided between the outer wall of the pull rod and the second through-hole.

Further, the bottoms of the plurality of cavities are in communication to form an installation cavity, a limiting part is provided in the installation cavity, and the limiting part is slidably connected to the traction wires.

Further, the limiting part is an intersection line cross buckle composed of rings corresponding to the traction wires, and the traction wires pass through the corresponding rings respectively.

The beneficial effects brought by the technical solution provided by the present invention are as follows: the anti-seismic pre-stressed anchor rod for real-time pre-tightening/warning provided by the present invention can resist destructive effect of a strong earthquake to a certain extent, and the pre-tightening effect before the earthquake can be achieved by tensioning traction wires and a sleeve head to restore the anchor rod to an initial state under the condition that the pre-stress of the anchor rod is relaxed after the earthquake; at the same time, pre-tightening force of extended traction wires can also be detected to timely warn whether the anchor rod has failed; the anti-seismic pre-stressed anchor rod for real-time pre-tightening/warning provided by the present invention has a long service life, a wide application range, and low maintenance costs.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of an implementation of an anchor rod according to an embodiment of the present invention;

FIG.2 is a schematic longitudinal section diagram of an anchor rod according to an embodiment of the present invention; LU502902

FIG. 3 is a schematic transverse section diagram of an pull rod according to an embodiment of the present invention;

FIG4 is a schematic structural diagram of an anchor rod according to an 5 embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a limiting part according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a wire harness ring according to an embodiment of the present invention; and

FIG. 7 is a schematic section diagram of a brake buffer ring according to an embodiment of the present invention.

In the figures, 1. pull rod; 11. cavity; 12. installation cavity; 13. accommodating cavity, 2. drill bit; 3. intersection line cross buckle; 31. ring; 4. traction wire; 5. bearing plate; 51. second through-hole; 6. spring, 7. sleeve head; 71. first through-hole; 8. wire harness ring; 81. third through-hole; 9. brake buffer ring; 91. fourth through-hole; 10. bedrock; 101. slurry; 102. rock formation interface; and 103. slipping mass.

DETAILED DESCRIPTION OF EMBODIMENTS

In order to have a clearer understanding of the technical features, purposes and effects of the present invention, now the specific implementations of the present invention is described in detail with reference to the accompanying drawings.

As shown in FIG. 2, an embodiment of the present invention provides an anti-seismic pre-stressed anchor rod for real-time pre-tightening/warning, including: a pull rod 1, a sleeve head 7, a bearing plate 5, and two traction wires 4;

where the pull rod 1 is provided with two “U” shaped structure cavities 11 LU502902 corresponding to the traction wire 4, the cavities 11 are arranged along the axial direction of the pull rod 1, the cavities 11 are arranged symmetrically along the axis line of the pull rod 1. As shown in FIG. 3, in this embodiment, a cross section of the “U”-shaped structure cavities 11 is a fan-shaped; the bottoms of the two “U”-shaped structure cavities 11 are in communication with each other to form an installation cavity 12, and a limiting part 3 is provided in the installation cavity 12 and is slidably connected to the corresponding traction wires 4; as shown in FIG. 5, in this embodiment, the limiting part 3 is an intersection line cross buckle formed by two rings 31 buckled with each other, where one of the rings 31 is fixed to the installation cavity 12; and the two traction wires 4 are arranged in corresponding the U-shaped structure cavities 11 and respectively pass through two rings 31 to be connected in a sliding manner, and two ends of the two traction wires protrude the U-shaped structure. cavities 11.

The bottom of the pull rod 1 is coaxially provided with a drill bit 2. As shown in

FIG.4, the shape of the drill bit 2 is hemispherical and is a force surface of an earthquake, which has effect of weakening diameter impact of the earthquake; the part of the upper surface exceeding the pull rod 1 is a plane, and is a pull surface of the pull rod 1 to ensure the uniformity and effectiveness of the pulling force; the drill bit 2 mainly serves the functions of positioning, limiting and preventing the pull rod 1 from being pulled out; in the present invention, the shape of the drill bit may also be conical.

The uppermost end of the pull rod 1 is provided with an accommodating cavity 13 for protecting two traction wires 4 gathered after protruding from the “U”-shaped structure cavity 11; in this embodiment, the accommodating cavity 13 is a cylindrical cavity and may also be a hemispherical cavity, and the accommodating cavity 13 is LU502902 integrally arranged with the pull rod 1; and outlets of two ends of the “U”-shaped structure cavity 11 are rounded at an edge close to the axis line for reducing friction between the traction wires 4 and the outlet of the “U”-shaped structure cavity 11, thereby prolonging a service life of the traction wires 4.

In the present invention, the number of the traction wires 4 may be increased according to different landforms and construction environments to meet a higher anchoring requirement, and both the number of the cavities 11 and the number of the rings are equal to the number of the traction wires 4.

In this embodiment, the traction wires 4 used is steel strand.

As shown in FIG. 2, the bearing plate 5 is provided with a second through-hole 51, the bearing plate is sleeved outside the pull rod 1 through the second through-hole 51, and is slidably connected to an outer wall of the pull rod 1; a gap is provided between the outer wall of the pull rod 1 and the second through-hole 51, and the gap facilitates pouring the slurry after the anchor rod is placed into a drill hole; in the present invention, the shape of the bearing plate 5 may be circular or square.

The upper end of the pull rod 1 is provided with an external thread, and the inner wall of the sleeve head 7 is provided with an internal thread, which is connected to the thread of upper end the pull rod 1. As shown in FIG. 2, the sleeve head 7 is fixedly connected to the bearing plate 5 through a driving part, and under an external force, the bearing plate 5 drives the driving part to drive the sleeve head 7 to move along the pull rod 1 in an axial direction; and the driving part is a spring 6, which is sleeved on the upper part of the pull rod 1, and two ends of the spring 6 are fixedly connected to the bearing plate 5 and the sleeve head 7 respectively.

In this embodiment, the used spring 6 has a function of driving the sleeve head 7 to move along the pull rod 1 in an axial direction and has a certain of buffering action; LUS02902 the sleeve head used in this embodiment is a truncated cone-like structure, and it may also be a cylindrical structure.

The top of the sleeve head 7 1s provided with a fixed part, the fixed part includes a brake buffer ring 9 and a wire harness ring 8, the wire harness ring 8 is fixedly connected to the brake buffer ring 9 and the sleeve head 7 respectively, the wire harness ring 8 plays the role of harnessing and concentrating force, and the brake buffer ring 9 has a buffering action; the top end of the sleeve head 7 is provided with a first through-hole 71, and the diameter of the first through-hole 71 is less than the diameter of the pull rod 1 and the diameter of the wire harness 8; as shown in FIG. 6 and FIG. 7, the wire harness ring 8 and the brake buffer ring 9 are provided with two third through-hole assemblies and a fourth through-hole assembly respectively, where the third through-hole assembly is provided with two third through-holes 81, and the fourth through-hole assembly is provide with two fourth through-holes 91 in circular truncated cone shape, and the third through-holes 81 and the fourth through-holes 91 are symmetrically arranged along the axis line of the pull rod 1; and the diameter of the third through-holes 81 and the minimum diameter 912 of the fourth through-holes 91 in circular truncated cone shape are greater than the diameter of the traction wires 4, where a side with the maximum diameter 911 of the fourth through-holes 91 in circular truncated cone shape faces upward; in the present invention, the number of the third through-holes 81 and the number of the fourth through-holes 91 change with the number of the traction wires 4, and sum of the number of the third through-holes 81 and the fourth through-holes 91 are twice as many as the number of the traction wires 4.

The two ends of the traction wires 4 pass through the first through-hole 71 of the sleeve head 7 and the corresponding third through-hole 81 the fourth through-hole 91 LU502902 in sequence, and are connected and fixed to form a ring structure.

As shown in FIG. 1, an anti-seismic pre-stressed anchor rod for real-time pre-tightening/warning provided in the embodiment, the lower end of the anchor rod penetrates deep into the drill hole, and due to the pre-tightening force generated by tightening the sleeve head 7, the bearing plate 5 of the anchor rod is tightly adhered to the surface of the bedrock 10; and the slurry 101 between a part of the anchor rod penetrating deep into the drill hole and the wall of the drill hole is poured to bond the anchor rod and the bedrock 10 into one piece, thereby forming an integral anchoring structure that is common stressed and deformed.

In the anchoring structure of the above embodiment, when it subjected to seismic force, some slipping mass 103 are generated on the surface of the bedrock 10, the slipping mass 103 has a tendency to slip obliquely downward or toppling, and at this time, the bearing plate 5 is subjected to an external force of the slipping mass 103, and then the spring 6, the sleeve head 7, the wire harness ring 8, and the brake buffer ring 9 are squeezed, so that the traction wires 4 are tensioned by force and make a part of the traction wires 4 protruding the brake buffer ring 9 are shortened, when the external force becomes greater and greater, the traction wires 4 are continuously stretched, the part of the traction wires 4 protruding the brake buffer ring 9 become shorter and shorter, and the part of the traction wires 4 protruding the brake buffer ring 9 are subjected to a great resistance by the brake buffer ring 9 when it is shortened. When stretched to a certain position, the traction wires 4 stop getting longer, and the slipping mass 103 stops slipping under the reaction force of the anchoring structure, which may weaken the effect of the seismic force to a certain extent.

After an earthquake, the traction wires 4 may be manually tightened to increase LU502902 extension length of the traction wires 4, thereby increasing the pre-tightening force; after stretching, the sleeve head 7 is re-tightened, so that the slipping mass 14 is fastened on the bedrock, at this time, the spring 6 is in a compressed state, and the resulting pre-stress may well maintain the stability of the anchoring slope, thereby increasing the durability of the anchoring structure; and at the same time, by detecting the pre-tightening force of the part of the traction wires 4 protruding the brake buffer ring, it can be determined whether the anchoring structure has failed, and if the monitored pre-tightening force of the extension length is almost zero, it is proved that the traction wires 4 are broken or the anchoring structure has failed.

The anti-seismic pre-stressed anchor rod for real-time pre-tightening/warning provided in the present invention can resist destructive effect of an earthquake to a certain extent, and the pre-tightening effect before the earthquake can be achieved by tensioning traction wires and a sleeve head to restore the anchor rod to an initial state under the condition that the pre-stress is relaxed after the earthquake; at the same time, the stability of the anchoring slope can also be analyzed by detecting the strength of the extended traction wires and timely warning whether the anchor has failed. The anti-seismic pre-stressed anchor rod for real-time pre-tightening/warning provided by the present invention has a long service life, a wide application range, and low maintenance costs.

It should be specifically pointed out that the embodiments of the present invention involved in the above description are a part of the embodiments of the present invention, not all of the embodiments. Therefore, all other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

Claims

What is claimed is LU502902

1. An anti-seismic pre-stressed anchor rod for real-time pre-tightening/warning, comprising: a pull rod, a sleeve head, a bearing plate, and at least two traction wires, wherein the pull rod is provided with a cavity of a “U”-shaped structure corresponding to the traction wire, the cavity is arranged along the axial direction of the pull rod, a plurality of cavities are arranged symmetrically along the axis line of the pull rod, and central axes of the plurality of cavities are located on the same horizontal line, and the bottoms thereof are in communication with each other; the traction wires are arranged in the corresponding cavities, and two ends thereof protrude the cavities; the bearing plate is sleeved outside the pull rod and is slidably connected to an outer wall of the pull rod; and the sleeve head is slidably mounted on the upper end of the pull rod, and a fixed part is arranged on the top thereof, two ends of the traction wires pass through the sleeve head and the fixed part in sequence, and are slidably connected to the fixed part; the fixed part is used for fixing the traction wires; the sleeve head is fixedly connected to the bearing plate through a driving part, and under the external force, the bearing plate drives the driving part to drive the sleeve head to move along the pull rod in an axial direction.

2. The anti-seismic pre-stressed anchor rod for real-time pre-tightening/warning according to claim 1, characterized in that the bottom of the pull rod is coaxially provided with a drill bit in hemispherical or conical structure.

3. The anti-seismic pre-stressed anchor rod for real-time pre-tightening/warning according to claim 2, characterized in that the upper end of the pull rod is coaxially provided with an accommodating cavity. LU502902

4. The anti-seismic pre-stressed anchor rod for real-time pre-tightening/warning according to claim 1, characterized in that the driving part is a spring, the spring is sleeved on the upper part of the pull rod, and two ends thereof are fixedly connected to the bearing plate and the sleeve head respectively.

5. The anti-seismic pre-stressed anchor rod for real-time pre-tightening/warning according to claim 1, characterized in that the fixed part comprises a brake buffer ring and a wire harness ring, the brake buffer ring and the wire harness ring are arranged on the top of the sleeve head from top to bottom in sequence, the wire harness ring is fixedly connected to the brake buffer ring and to the sleeve head respectively, and the two ends of the traction wires pass through the wire harness ring and the brake buffer ring in sequence, and are connected and fixed.

6. The anti-seismic pre-stressed anchor rod for real-time pre-tightening/warning according to claim 5, characterized in that a third through-hole assembly and a fourth through-hole assembly corresponding to the traction wires are arranged on the wire harness ring and the brake buffer ring respectively, and the two ends of the traction wires pass through the corresponding third through-hole assembly and the fourth through-hole assembly in sequence.

7. The anti-seismic pre-stressed anchor rod for real-time pre-tightening/warning according to claim 6, characterized in that the third through-hole assembly is provided with two third through-holes, and the fourth through-hole assembly is provided with two fourth through-hole in circular truncated cone shape, and the third through-holes and the fourth through-holes are symmetrically arranged along the axis line of the pull rod.

8. The anti-seismic pre-stressed anchor rod for real-time pre-tightening/warning according to claim 1, characterized in that a second through-hole is provided in the LU502902 middle of the bearing plate, the upper end of the pull rod passes through the second through-hole, and a gap is provided between the outer wall of the pull rod and the second through-hole.

9. The anti-seismic pre-stressed anchor rod for real-time pre-tightening/warning according to claim 1, characterized in that the bottoms of the plurality of cavities are in communication to form an installation cavity, a limiting part is provided in the installation cavity, and the limiting part is slidably connected to the traction wires.

10. The anti-seismic pre-stressed anchor rod for real-time pre-tightening/warning according to claim 9, characterized in that the limiting part is an intersection line cross buckle composed of rings corresponding to the traction wires, and the traction wires pass through the corresponding rings respectively.