CN109083144B - Energy-consumption anti-seismic prestressed anchor cable - Google Patents
Energy-consumption anti-seismic prestressed anchor cable Download PDFInfo
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- CN109083144B CN109083144B CN201811147320.4A CN201811147320A CN109083144B CN 109083144 B CN109083144 B CN 109083144B CN 201811147320 A CN201811147320 A CN 201811147320A CN 109083144 B CN109083144 B CN 109083144B
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- 238000005265 energy consumption Methods 0.000 title claims abstract description 44
- 238000004873 anchoring Methods 0.000 claims abstract description 55
- 229910000831 Steel Inorganic materials 0.000 claims description 26
- 239000010959 steel Substances 0.000 claims description 26
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 230000021715 photosynthesis, light harvesting Effects 0.000 claims description 4
- 238000006073 displacement reaction Methods 0.000 abstract description 12
- 230000006835 compression Effects 0.000 abstract description 7
- 238000007906 compression Methods 0.000 abstract description 7
- 230000002035 prolonged effect Effects 0.000 abstract description 7
- 238000001125 extrusion Methods 0.000 abstract description 6
- 230000006872 improvement Effects 0.000 description 6
- 230000008093 supporting effect Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
-
- 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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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses an energy-consumption anti-seismic prestressed anchor cable, which comprises an anchor section, a free section and an energy-consumption anchor device, wherein the tail end of the anchor section is provided with a guide end head, and the anchor cable is anchored in bedrock by grouting through a grouting pipe; the free section can be prestressed by a jack; the energy consumption anchoring device consists of an anchor, a high-strength compression spring, a lead core, an anchoring sleeve and an anchor backing plate. The anchor cable sequentially passes through the anchor backing plate, the lead core and the holes on the anchor, and is anchored on the anchor after being prestressed by the tensioning jack. When an earthquake occurs, the landslide body slides downwards to further extrude the anchor backing plate, the high-strength spring is compressed, the lead core in the energy-consumption anchoring device is extruded out of the hole of the anchoring sleeve to generate extrusion energy consumption, and meanwhile, the side surface of the anchoring device and the inner wall of the anchoring sleeve generate friction energy consumption, so that the earthquake energy can be effectively dissipated. The length of the free section of the anchor cable is prolonged by extruding the high-strength spring, so that the landslide body is allowed to generate certain displacement, and the anchor cable can be effectively prevented from being broken, thereby achieving the purposes of resisting earthquake and energy consumption and protecting the anchor cable.
Description
Technical Field
The invention relates to an anchor cable structure, in particular to an energy-consumption anti-seismic prestressed anchor cable, and belongs to the anti-seismic field of side slope engineering.
Background
The prestressed anchor cable is widely applied to side landslide control engineering, and compared with the completely rigid supporting structures such as anti-slide piles, retaining walls and the like, the prestressed anchor cable can generate certain elastic displacement under the action of earthquake, so that the prestressed anchor cable has better earthquake resistance. An energy-dissipation self-adaptive anti-seismic anchor cable structure and an implementation method thereof are disclosed in Chinese invention patent No. 201410751411.4.
However, when an earthquake occurs, the landslide body usually generates larger displacement which is larger than the elastic displacement limit which can be generated by the prestressed anchor cable, so that the anchor cable is broken or the anchor head is damaged, thereby losing the supporting function and generating the earthquake landslide.
Aiming at the problems, the invention provides the energy-consumption anti-seismic prestressed anchor cable, which improves the anti-seismic performance of the existing prestressed anchor cable by adopting a special energy-consumption anchoring device and ensures the stability of a side slope in and after earthquake.
Disclosure of Invention
The invention aims to solve the technical problem of providing the energy-consumption anti-seismic prestressed anchor cable capable of dissipating a large amount of seismic energy and avoiding the anchor cable from being broken and destroyed by pulling.
In order to solve the problems, the invention adopts the following technical scheme:
the utility model provides an energy dissipation antidetonation prestressed anchorage cable, its includes anchor section, free section and power dissipation anchor, its key technology lies in:
the energy consumption anchoring device comprises an anchor backing plate fixed on a concrete anchor pier, an anchor sleeve fixed on the anchor backing plate, a spring, a lead core and an anchor, wherein the spring, the lead core and the anchor are arranged in the anchor sleeve, the spring is clamped between the anchor and the anchor backing plate, the initial outer diameter of the lead core is smaller than the inner diameter of the spring, the lead core is arranged in the spring, and a plurality of through holes are formed in the side wall of the anchor sleeve;
one end of the steel strand is fixed in the anchoring section, the other end sequentially passes through the anchor backing plate, the lead core and the anchor, the anchor is anchored on the anchor after the prestress is applied by the tensioning jack, the anchor is pressed down after the prestress is applied to the steel strand, the space among the anchor, the anchor backing plate and the anchor sleeve is filled after the lead core is deformed, and the anchor cable is in a normal working state.
As a further improvement of the invention, the cross section of the anchoring sleeve is in a circular shape, the inner wall of the anchoring sleeve is provided with a tiny taper, and the inner diameter of the anchoring sleeve is reduced along the direction of the anchor towards the anchor backing plate so as to increase the friction force between the anchor and the anchoring sleeve when the anchor moves towards the anchor backing plate.
As a further improvement of the invention, the inner wall of the anchoring sleeve is sprayed with an inorganic friction coating so as to increase the friction coefficient between the anchor and the anchoring sleeve.
As a further development of the invention, the plurality of through holes are uniformly arranged in a quincuncial shape on the side wall of the anchoring sleeve.
As a further improvement of the invention, the spring is in a compressed state, the counterforce of the spring is equal to the design tension of the anchor cable, and the spring is in a plastic deformation state after exceeding a set pressure threshold value, so that the set pressure can be maintained and larger deformation can occur.
As a further improvement of the invention, holes which are equal to the steel strands are arranged on the anchor, and clamping pieces are arranged in the holes to fix the steel strands on the anchor.
As a further improvement of the invention, holes which are equal to the steel strands are arranged on the lead core and the anchor backing plate.
As a further improvement of the invention, the anchoring sleeve and the anchor backing plate are welded into a whole, and stiffening ribs are arranged between the outer wall of the anchoring sleeve and the anchor backing plate in a uniformly circumferentially spaced manner.
The beneficial effects of adopting above-mentioned technical scheme to produce lie in:
under the static working condition, the energy-consumption anti-seismic prestressed anchor cable disclosed by the invention has the same supporting effect on the side slope as the common prestressed anchor cable; however, in the earthquake, the energy-consumption earthquake-resistant prestressed anchor cable can exert good earthquake resistance, can dissipate a large amount of earthquake energy, avoids the anchor cable from being broken and destroyed, and achieves the earthquake-resistant purpose.
Specifically, the energy-consumption anchoring device has a double energy-consumption mechanism, namely friction energy consumption of the side surface of the anchoring device and the inner wall of the anchoring sleeve, and extrusion energy consumption of the lead core. In addition, by squeezing the high-strength spring, the length of the free section of the anchor cable is prolonged by the elastic deformation and/or plastic deformation of the spring, so that the landslide body is allowed to displace to a certain extent, and the landslide body can dissipate considerable displacement energy consumption. The energy consumption anchoring device and the landslide body consume energy per se to effectively dissipate the earthquake input energy and effectively improve the earthquake stability of the supported side slope. After the length of the free section of the anchor cable is prolonged, the anchor cable can be effectively prevented from being damaged due to overload or overlarge deformation, so that the aims of resisting earthquake and energy consumption and protecting the anchor cable are achieved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural view of the present invention.
FIG. 2 is a schematic view of the anchor sleeve and anchor pad assembly of the present invention.
Fig. 3 is a schematic structural view of the energy consuming anchor device of the present invention without prestressing.
Fig. 4 is a schematic structural view of the energy consuming anchor device of the present invention in a normal use operating state.
Wherein: the energy-consumption anchoring device comprises a 1 energy-consumption anchoring device, a 11 anchoring sleeve, a 111 through hole, a 112 inorganic friction coating, a 12 anchoring backing plate, a 121 steel strand hole, a 13 stiffening rib, a 14 anchoring device, a 15 clamping piece, a 16 spring, a 17 lead core, a 18 concrete anchor pier, a 2 anchor rope free section, a 21 steel strand, a 22 grouting pipe, a 3 anchor rope anchoring section and a 31 guiding end.
Detailed Description
For the purposes of clarity, technical solutions and advantages of the present invention, the following description will be made in detail with reference to specific embodiments, it should be understood that the terms "center," "vertical," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," etc. are used for convenience of description and for simplifying the description, but do not indicate or imply that the apparatus or elements to be referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention.
The energy-consumption anti-seismic prestressed anchor cable comprises an anchoring section 3, a free section 2 and an energy-consumption anchoring device 1, wherein a guiding end head 31 is arranged at the tail end of the anchoring section 3, and a steel strand 21 is anchored in bedrock by grouting through a grouting pipe 22.
The energy-consumption anchoring device 1 comprises an anchor backing plate 12 fixed on a concrete anchor pier 18, an anchor sleeve 11 fixed on the anchor backing plate 12, a spring 16, a lead core 17 and an anchorage 14 which are arranged in the anchor sleeve 11, wherein the anchor sleeve 11 and the anchor backing plate 12 are welded into a whole, stiffening ribs 13 are uniformly welded between the outer wall of the anchor sleeve 11 and the anchor backing plate 12 at annular intervals, and the stiffening ribs are used for increasing the structural strength between the anchor sleeve 11 and the anchor backing plate 12.
The spring 16 is a high-strength compression spring, the spring 16 is clamped between the anchor 14 and the anchor backing plate 12, two ends of the spring 16 are respectively connected with the anchor backing plate 12 and the anchor 14, and the rigidity of the spring 16 is determined according to the working tension of the anchor cable.
As shown in fig. 3 and 4, the outer diameter of the lead 17 is smaller than the inner diameter of the spring 16, the lead 17 is arranged in the spring 16, a plurality of through holes 111 are arranged on the side wall of the sleeve 11, and the through holes 111 are uniformly distributed on the side wall of the anchoring sleeve 11 in a plum blossom shape; one end of a plurality of steel strands 21 is fixed in the anchoring section 3, the other end sequentially passes through the anchor backing plate 12, the lead 17 and the anchorage device 14, the steel strands 21 are anchored on the anchorage device 14 after being prestressed by the tensioning jack, the anchorage device 14 is pressed down, the space among the anchorage device 14, the anchor backing plate 12 and the anchoring sleeve 11 is filled with the deformed lead 17, the lead 17 is extruded into the through hole 111, the spring 16 is in a compressed state, the deformed lead 17 is wrapped, and the anchor cable is in a normal working state. When the anchor cable is in an operating state, the spring 16 bears a pressure equal to the design tension of the anchor cable. When an earthquake occurs, the tension of the anchor cable is increased, and the spring 16 is in a plastic deformation state after exceeding a set pressure threshold value, so that the set pressure can be maintained and larger deformation can be generated; if the spring 16 is always in an elastic state, the compression amount and the pressure of the spring 16 are in direct proportion, the displacement of the anchorage device relative to the anchoring sleeve is smaller, the energy consumption effect is poorer, and the tension of the anchor cable is overlarge when larger displacement is generated, so that the anchor cable is easy to break and destroy; in the invention, when the spring 16 exceeds a certain pressure threshold, plastic deformation is generated, and the pressure is maintained, and meanwhile, the anchorage device is enabled to generate larger displacement relative to the anchorage sleeve, so that the energy-consumption anchorage device 1 generates larger energy consumption; meanwhile, the length of the free section of the anchor cable is prolonged, so that the landslide mass is allowed to displace to a certain extent and consume energy, the anchor cable can be effectively prevented from being damaged due to overload or overlarge deformation, and the aims of resisting earthquake and consuming energy and protecting the anchor cable are achieved.
Holes which are equal to the steel stranded wires 21 are formed in the anchorage device 14, and clamping pieces 15 are arranged in the holes to fix the steel stranded wires 21 on the anchorage device 14. The anchor backing plates 12 are provided with steel strand holes 121 equal to the steel strands 21, and the lead 17 is also provided with holes equal to the steel strands 21 for allowing the steel strands 21 to pass through.
As shown in fig. 2 and 3, the cross section of the anchoring sleeve 11 is in a circular shape, the inner wall of the anchoring sleeve 11 is provided with a slight taper, and the inner diameter of the anchoring sleeve 11 is reduced along the direction of the anchor 14 towards the anchor pad 12 so as to increase the friction between the anchor 14 and the anchoring sleeve 11 when moving towards the anchor pad 12. The inner wall of the anchoring sleeve 11 is coated with a high friction coefficient inorganic friction coating 112 to increase the friction coefficient between the anchor 14 and the anchoring sleeve 11. By providing the inner wall of the anchor sleeve 11 with a slight taper and an inorganic friction coating 112, the friction between the anchor 14 and the inner wall of the anchor sleeve 11 is greatly increased, thereby increasing the energy dissipated by the anchor cable during an earthquake.
The energy-consuming anchoring device 1 according to the invention has a double energy-consuming mechanism, namely the extrusion energy consumption of the lead 17 and the friction energy consumption between the anchor 14 and the anchor sleeve 11. When an earthquake occurs, the landslide body slides downwards to further extrude the anchor backing plate 12, the spring 16 contracts, the lead core 17 is extruded out of the through hole 111 on the wall of the anchor sleeve 11, and extrusion energy consumption is generated; meanwhile, friction energy dissipation occurs between the side face of the anchorage device 14 and the inner wall of the anchorage sleeve 11, so that earthquake energy can be effectively dissipated. The length of the free section 2 of the anchor cable is prolonged by extruding the high-strength spring 16, so that the landslide body is allowed to displace to a certain extent and displacement energy consumption is generated, and meanwhile, the anchor cable can be effectively prevented from being broken, thereby achieving the purposes of resisting earthquake energy consumption and protecting the anchor cable.
The anchoring section 3 and the free section 2 have the same structure as a common prestress anchor cable, one end of a steel strand 21 is fixedly connected with a guide end head 31, during construction, anchor cable holes are drilled on a landslide body, then the guide end head 31 and the steel strand 21 are installed in the anchor cable holes, and the anchoring section 3 is embedded and fixed in bedrock through grouting of a grouting pipe 22. Then the construction of the concrete anchor pier 18 is completed, and then the energy-consuming anchor device 1 is installed.
As shown in fig. 3, in an initial state of installing the energy-consuming anchor device 1, the combination of the anchor sleeve 11 and the anchor pad 12, the spring 16, the lead core 17 and the anchor 14 are sequentially installed on the concrete anchor pier 18. The steel strand 21 passes through the openings 121 of the anchor pad 12, the lead 17, and the hole in the anchor 14 in sequence, and the steel strand 21 is secured to the anchor 14 by the clip 15. The lead 17 outer diameter is now smaller than the inner diameter of the high-strength compression spring 16. Tensioning jacks are arranged on the anchors 14, prestress is applied to the anchor cable, the anchors 14 are pressed down, and the lead cores 17 are deformed to fill the spaces among the anchors 14, the anchor backing plates 12 and the anchor sleeves 11 as shown in fig. 4. The high-strength compression spring 16 is in an elastic state and is subjected to a pressure equal to the design tension of the cable. After the prestressing force is applied, the anchor cable is in a normal working state (static working condition).
When an earthquake occurs, the potential landslide body slides downwards to drive the anchor backing plate 12 and the anchor sleeve 11 to move outwards, the anchor 14, the anchor backing plate 12 and the anchor sleeve 11 move relatively, in the process, friction energy consumption is generated between the side surface of the anchor 14 and the inner wall of the anchor sleeve 11, the lead 17 is extruded by the anchor 14, and part of the lead is extruded out of the through hole 111 on the wall of the anchor sleeve to generate extrusion energy consumption. Meanwhile, the high-strength compression spring 16 is compressed, the length of the free section of the anchor rope is prolonged, after the tension of the anchor rope exceeds a set pressure threshold value, the high-strength compression spring 16 is in a plastic deformation state, the length of the free section of the anchor rope is further prolonged, the anchor rope is prevented from being overloaded and damaged in an allowable displacement range, meanwhile, corresponding displacement of a landslide body is allowed, friction energy consumption and extrusion energy consumption of an energy consumption anchoring device and displacement energy consumption of a potential landslide body are allowed, and earthquake input energy is effectively dissipated, so that the purposes of earthquake resistance and energy consumption and anchor rope protection are achieved, earthquake stability of a side slope is improved, and normal supporting function of the anchor rope after earthquake is guaranteed.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (5)
1. The utility model provides an energy dissipation antidetonation prestressed anchorage cable, its includes anchor section (3), free section (2) and power dissipation anchor (1), its characterized in that:
the energy consumption anchoring device (1) comprises an anchor base plate (12) fixed on a concrete anchor pier (18), an anchor sleeve (11) fixed on the anchor base plate (12), a spring (16) arranged in the anchor sleeve (11), a lead core (17) and an anchorage device (14), wherein the spring (16) is clamped between the anchorage device (14) and the anchor base plate (12), the initial outer diameter of the lead core (17) is smaller than the inner diameter of the spring (16), the lead core (17) is arranged in the spring (16), and a plurality of through holes (111) are formed in the side wall of the anchor sleeve (11);
one end of the steel strand (21) is fixed in the anchoring section (3), the other end sequentially passes through the anchor backing plate (12), the lead core (17) and the anchorage device (14), the steel strand is anchored on the anchorage device (14) after being prestressed by the tensioning jack, the steel strand (21) is prestressed, the anchorage device (14) is pressed down, the lead core (17) is deformed and then fills the space among the anchorage device (14), the anchor backing plate (12) and the anchorage sleeve (11), and the anchor cable is in a normal working state;
the cross section of the anchoring sleeve (11) is in a circular shape, the inner wall of the anchoring sleeve (11) is provided with a tiny taper, and the inner diameter of the anchoring sleeve (11) is reduced along the direction of the anchor (14) towards the anchor backing plate (12) so as to increase the friction between the anchor (14) and the anchoring sleeve (11) when the anchor (14) moves towards the anchor backing plate (12);
an inorganic friction coating (112) is sprayed on the inner wall of the anchoring sleeve (11) so as to increase the friction coefficient between the anchorage device (14) and the anchoring sleeve (11);
the spring (16) is in a compressed state, the counterforce of the spring is equal to the design tension of the anchor cable, and the spring (16) is in a plastic deformation state after exceeding a set pressure threshold.
2. The energy-consuming anti-seismic pre-stressed anchor cable of claim 1, wherein: the through holes (111) are uniformly distributed on the side wall of the anchoring sleeve (11) in a quincuncial shape.
3. The energy-consuming anti-seismic pre-stressed anchor cable of claim 1, wherein: holes in equal number to the steel strands (21) are formed in the anchorage device (14), and clamping pieces (15) are arranged in the holes to enable the steel strands (21) to be fixed on the anchorage device (14).
4. The energy-consuming anti-seismic pre-stressed anchor cable of claim 1, wherein: holes which are equal to the steel stranded wires (21) are formed in the lead core (17) and the anchor backing plate (12).
5. The energy-consuming anti-seismic pre-stressed anchor cable of claim 1, wherein: the anchor sleeve (11) and the anchor backing plate (12) are welded into a whole, and stiffening ribs (13) are arranged between the outer wall of the anchor sleeve (11) and the anchor backing plate (12) in a uniformly circumferentially spaced manner.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811147320.4A CN109083144B (en) | 2018-09-29 | 2018-09-29 | Energy-consumption anti-seismic prestressed anchor cable |
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| CN201811147320.4A CN109083144B (en) | 2018-09-29 | 2018-09-29 | Energy-consumption anti-seismic prestressed anchor cable |
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| CN109083144B true CN109083144B (en) | 2023-12-19 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110344409B (en) * | 2019-07-12 | 2024-01-26 | 中南大学 | Energy-absorbing and shock-absorbing anchor rod head device |
| CN110863490A (en) * | 2019-12-24 | 2020-03-06 | 中铁二院工程集团有限责任公司 | Pressure type shock-absorbing energy-dissipating pre-stressed anchor cable structure and construction method |
| CN112962631A (en) * | 2021-02-07 | 2021-06-15 | 四川华佑天成科技有限公司 | Slope reinforcement system and reinforcement method thereof |
| CN114396045A (en) * | 2022-03-04 | 2022-04-26 | 重庆交通大学 | Anti-seismic anchor cable structure and toughness improving method |
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2018
- 2018-09-29 CN CN201811147320.4A patent/CN109083144B/en active Active
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| CN101514569A (en) * | 2009-04-05 | 2009-08-26 | 大连理工大学 | Twisting-resistant self-restoring lead core shape memory alloy damper |
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