CN107152022B - Internal expansion type grouting-free recyclable anchor cable and construction method thereof - Google Patents
Internal expansion type grouting-free recyclable anchor cable and construction method thereof Download PDFInfo
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- CN107152022B CN107152022B CN201710580433.2A CN201710580433A CN107152022B CN 107152022 B CN107152022 B CN 107152022B CN 201710580433 A CN201710580433 A CN 201710580433A CN 107152022 B CN107152022 B CN 107152022B
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- 238000010276 construction Methods 0.000 title claims abstract description 13
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 84
- 239000010959 steel Substances 0.000 claims abstract description 84
- 238000004873 anchoring Methods 0.000 claims abstract description 46
- 230000005540 biological transmission Effects 0.000 claims abstract description 12
- 230000000149 penetrating effect Effects 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 5
- 239000007901 soft capsule Substances 0.000 claims description 4
- 239000002390 adhesive tape Substances 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 238000004804 winding Methods 0.000 claims description 3
- 239000002689 soil Substances 0.000 abstract description 12
- 238000005516 engineering process Methods 0.000 description 9
- 206010066054 Dysmorphism Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
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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
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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
- E02D5/765—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor removable
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
- E21D21/0046—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts formed by a plurality of elements arranged longitudinally
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- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
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- Piles And Underground Anchors (AREA)
Abstract
The anchor cable comprises an anchoring section and a free section, wherein the anchoring section comprises an inner cylindrical section formed by enclosing a plurality of inner arc-shaped supporting plates and an outer cylindrical section formed by enclosing a plurality of outer arc-shaped supporting plates, an expander is arranged in the inner cylindrical section, a center steel strand is fixedly arranged in the expander in a penetrating manner, one end of the inner cylindrical section is connected to a first supporting seat through a first supporting connecting rod, the other end of the inner cylindrical section is connected to a second supporting seat through a second supporting connecting rod, the free section comprises a force transmission steel strand connected between the end parts of the inner cylindrical section and the outer cylindrical section and an anchor cable connecting disc, one side of the anchor cable connecting disc is connected with a tension steel strand, a cable feeder is arranged in the center of the anchor cable connecting disc in a penetrating manner, and the cable feeder is propped against the first supporting seat. The anchoring force of the anchoring section is provided by the inner expansion type side frictional resistance, grouting is not needed, the surrounding soil body can be prevented from being polluted, the construction period can be shortened, the anchor cable can be recycled, and the cost can be reduced.
Description
Technical Field
The invention relates to the technical field of urban foundation pit and side slope support, in particular to an internal expansion type grouting-free recoverable anchor cable and a construction method thereof.
Background
Since the first use in the 19 th century, the anchoring technology has been developed for over 100 years, and people pay attention to the anchoring technology due to the advantages of safety, rapidness, low manufacturing cost, small occupied operation space and the like. The anchoring technology is tried in the middle of the 50 th century in China until the 70 th century in 20 th century, and the technology is popularized and used in China. Although the anchoring technology is developed in China for less than half a century, in this period, China is in the economic rapid development stage, and the anchoring technology is widely applied.
With the rapid advance of urban construction, the problems caused by the lack of standardized use of anchoring technology are prominent day by day. For example, shield technology is widely used. By the end of 2015, 25 cities are built into 111 railway lines in China, the length of the railway line reaches 3286 kilometers, and compared with 2005, the composite speed increase of the total mileage reaches 23.7%. The use of the shield machine advances the construction of urban subways into a new period, and for the shield machine, the anchor rods (cables) in the urban construction area are the most troublesome. Thus, the definition of building a red line is not just a definition of the ground, but should also encompass the red line of the underground space.
The existing recoverable anchor cable needs grouting in some cases and only partial recovery in some cases, so that a better technology for recovering the anchor cable needs to be designed to solve the above problems.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an internal-expanding type grouting-free recoverable anchor cable which is free of grouting, can be completely recovered and has high repeated utilization rate, and a construction method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
the inner expansion type grouting-free recoverable anchor cable comprises an anchoring section and a free section connected to one end of the anchoring section, wherein the anchoring section comprises an inner cylindrical section formed by a plurality of inner arc-shaped supporting plates and an outer cylindrical section formed by a plurality of outer arc-shaped supporting plates, the outer cylindrical section is arranged on the periphery of the inner cylindrical section, a guide column is arranged on the inner wall of the outer cylindrical section, a guide groove is formed in the inner cylindrical section along the circumferential direction of the inner cylindrical section, the guide column is inserted into the guide groove and can slide in the guide groove, an expander is arranged in the inner cylindrical section, a central steel strand is fixedly arranged in the expander in a penetrating manner, one end, close to the free section, of the inner cylindrical section is connected to a first supporting seat through a first supporting connecting rod, the other end, far away from the free section, of the inner cylindrical section is connected to a second supporting seat through a second supporting connecting rod, the free section comprises a force transmission steel strand, and the end parts of the inner cylindrical section and the outer cylindrical section are connected to the anchor cable Between the dish, the anchor rope connection pad is kept away from one side of anchor section is connected with the tensioning steel strand wires that can be by stretch-draw, send the cable ware to wear to be equipped with at the center of anchor rope connection pad, send the one end of cable ware support in first supporting seat, the one end of central steel strand wires connect in the second supporting seat, the other end passes first supporting seat with send the cable ware and by stretch-draw.
Furthermore, the anchoring section is sequentially divided into a head section, a plurality of sections of standard sections and a tail section along the axial direction of the anchoring section, and the head section is connected with the standard sections, the head section is adjacent to the standard sections, and the standard sections are connected with the tail end in a welding mode.
Further, the inner cylindrical section is formed by surrounding three inner arc-shaped supporting plates in the circumferential direction, the outer cylindrical section is formed by surrounding three outer arc-shaped supporting plates in the circumferential direction, when the central steel strand is tensioned, the inner cylindrical section and the outer cylindrical section are propped open by the expander, and the anchoring section forms a hexagonal arc-shaped special-shaped cross section.
Further, the expander comprises a support fixed on the inner wall of the inner cylindrical section, a tapered hole is formed in one side, away from the free section, of the support, a circular truncated cone type inner expanding plug is arranged in the tapered hole, the central steel strand is fixed on the circular truncated cone type inner expanding plug through a clamping piece, and when the central steel strand is tensioned, the circular truncated cone type inner expanding plug moves towards a pointed cone part of the tapered hole to strut the inner cylindrical section and the outer cylindrical section.
Furthermore, one end of each inner arc-shaped supporting plate is hinged to the first supporting seat through the first supporting connecting rod, and the other end of each inner arc-shaped supporting plate is hinged to the second supporting seat through the second supporting connecting rod.
Furthermore, an end plate is arranged at one end, facing the free section, of the inner cylindrical section and the outer cylindrical section, and a round hole is formed in the end plate and used for the force transmission steel strand to penetrate through and be fixed.
Furthermore, nine holes are symmetrically arranged on the anchor cable connecting disc, six holes are connected with the force transmission steel strand, and the other three holes are used for connecting the tension steel strand.
Furthermore, the cable feeder comprises a plurality of sections of supporting tubes, wherein the hollow openings are used for the central steel strand to pass through, the adjacent supporting tubes are connected through a connector, and ends are arranged at two ends of each supporting tube.
Further, a soft capsule bag is arranged outside the anchoring section.
A construction method based on the internal expansion type grouting-free recoverable anchor cable comprises the following steps:
the method comprises the following steps: feeding an anchor cable, assembling and connecting the anchoring section and the free section, winding and fixing the outside by using an adhesive tape, and pushing the anchor cable into the drill hole from one end far away from the free section until the anchor cable reaches the bottom position of the drill hole;
step two: opening an inner support, enabling the central steel strand to penetrate through the cable feeder, enabling the cable feeder to extend from the center of the anchor cable connecting disc and to be jacked to the end portion of the first supporting seat, enabling the central steel strand to be connected with an anchor cable stretching machine through a single-hole lock outside the cable feeder, starting the anchor cable stretching machine to pull the central steel strand, driving the expander to expand, stretching the inner arc-shaped supporting plate and the outer arc-shaped supporting plate, and locking the central steel strand in the single-hole lock when the pressure value of the anchor cable stretching machine is stable;
step three: after the free-section external equipment is installed, the tensioning steel strand and the central steel strand penetrate through a porous lock and then are connected to an anchor cable tensioning machine, the anchor cable tensioning machine is started to simultaneously pull the tensioning steel strand and the central steel strand, and after a tensioning value reaches a design requirement, the tensioning steel strand and the central steel strand are locked in the porous lock;
step four: and (4) recovering the anchor cable, cutting off the central steel strand and the tensioning steel strand after external equipment when the anchor cable is no longer required to provide supporting force, gradually releasing the prestress, returning the expander to the position before tensioning, and pulling out the anchor cable after the stress is restored to balance.
The invention has the beneficial effects that:
the anchor section is enclosed into interior cylinder section and outer cylinder section by interior arc backup pad and outer arc backup pad, and after central steel strand wires stretch-draw, the expander struts interior arc backup pad and outer arc backup pad, makes the anchor section form hexagonal arc dysmorphism cross-section, can increase the area of contact with the soil body, better improvement anchor section's anchor power. The anchoring force of the anchoring section is provided by means of the inner expansion type side friction resistance, grouting is not needed, the surrounding soil body can be prevented from being polluted, the construction period can be shortened, the anchor cable can be recycled, the cost is reduced, the anchor cable is suitable for supporting various soil bodies, and the application range is wide.
Drawings
Fig. 1 is a schematic structural view of an internal expansion type grouting-free recoverable anchor cable of the invention;
FIG. 2 is a schematic diagram of the structure of the inner cylindrical section of FIG. 1;
FIG. 3 is a schematic view of the configuration of the curved support plate in the sheet of FIG. 2;
fig. 4 is a schematic structural view of a circular table type inner expanding plug in the inner expanding type grouting-free recoverable anchor cable expander;
FIG. 5 is a cross-sectional view of the expander in the inner expanding type grouting-free recoverable anchor cable of the present invention;
FIG. 6 is a schematic structural view of a single outer arcuate support plate of FIG. 1;
FIG. 7 is a schematic structural view of the inner expanding type grouting-free recoverable anchor cable of the present invention after being expanded;
FIG. 8 is a cross-sectional view of FIG. 7;
FIG. 9 is a schematic view of the cable feeder of FIG. 7;
in the figure, 1-a first section, 2-a standard section, 3-a tail section, 4-an inner cylindrical section, 5-an inner arc-shaped supporting plate, 6-a guide groove, 7-a supporting frame, 8-a tapered hole, 9-a truncated cone type inner expanding plug, 10-a central steel strand, 11-an outer cylindrical section, 12-an outer arc-shaped supporting plate, 13-a guide column, 14-a first supporting connecting rod, 15-a first supporting seat, 16-a second supporting connecting rod, 17-a second supporting seat, 18-an end plate, 19-a round hole, 20-an anchor cable connecting plate, 21-a force transmission steel strand, 22-a pulling steel strand, 23-a cable feeder, 24-a supporting tube, 25-a connecting head, 26-an end head and 27-a clamping piece.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly. In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
Referring to fig. 1, the invention provides an internal expansion type grouting-free recoverable anchor cable, which comprises an anchoring section and a free section connected to one end of the anchoring section, wherein the anchoring section is sequentially divided into a first section 1, a plurality of standard sections 2 and a tail section 3 along the axial direction of the anchoring section, and the first section 1 and the standard sections 2, the adjacent standard sections 2 and the tail sections 2 and 3 are all welded and connected.
As shown in fig. 1 to 3, the anchoring section includes an inner cylindrical section 4 surrounded by a plurality of inner arc-shaped support plates 5, and an outer cylindrical section 11 surrounded by a plurality of outer arc-shaped support plates 12, and the outer cylindrical section 11 is disposed at the periphery of the inner cylindrical section 4. In the present embodiment, the inner cylindrical section 4 is circumferentially enclosed by three pieces of inner arc-shaped support plates 5, and the cross section is a circular cross section. The inner cylindrical section 4 is provided with a guide groove 6 along the circumferential direction, and the guide groove 6 extends from the edge circumferential direction of the inner arc-shaped support plate 5. An expander is arranged in the inner cylindrical section 4, a central steel strand 10 is fixedly arranged in the expander in a penetrating mode, and the central steel strand 10 penetrates through the center of the inner cylindrical section 4 and extends towards two ends. Interior cylinder section 4 is close to the one end of free section, and the first section of anchor section promptly connects in first supporting seat 15 through first supporting link 14, and the both ends of first supporting link 14 articulate between interior arc backup pad 5 and first supporting seat 15, and the other end of free section is kept away from to interior cylinder section 4, and the tail section of anchor section promptly connects in second supporting seat 17 through second supporting link 16, and the both ends of second supporting link 16 articulate between interior arc backup pad 12 and second supporting seat 17. In this embodiment, the head end of each inner arc-shaped support plate 5 is hinged to the first support seat 15 through the first support link 14, and the tail end of each inner arc-shaped support plate 5 is hinged to the second support seat 17 through the second support link 16.
As shown in fig. 3 to 5 and 8, the expander comprises a support frame 7 fixed on the inner wall of the inner cylindrical section 4, a tapered hole 8 is formed in one side, away from the free section, of the support frame 7, a channel for a central steel strand 10 to pass through is formed in the middle of the tapered hole 8, a circular truncated cone type inner expanding plug 9 is arranged in the tapered hole 8, and the end, with the smaller diameter, of the circular truncated cone type inner expanding plug 9 is close to the pointed conical part of the tapered hole 8. The central steel strand 10 is fixed in the round table type inner expanding plug 9 through the clamping piece 27, and when the central steel strand 10 is tensioned, the round table type inner expanding plug 9 moves towards the pointed cone part of the tapered hole 8 to prop open the inner cylindrical section 4 and the outer cylindrical section 11, so that the anchoring section forms a hexagonal arc-shaped special-shaped cross section, the contact area of the anchor cable and a soil body can be increased, and the anchoring force is better improved. The first and second support links 14 and 16 may constrain the inner arc support plate 5 from expanding along its arc normal direction. The expander is generally made of a material with a small friction coefficient, when the expander reaches a maximum safe expansion state, the distance between the position of the clamping piece 27 of the circular truncated cone type inner expanding plug 9 and the second supporting seat 17 is calculated, and the length of the section of the central steel strand 10 is reasonably arranged.
As shown in fig. 6 and 7, in the present embodiment, the outer cylindrical section 11 is surrounded by three outer arc support plates 12 in the circumferential direction, and has a circular cross section and a diameter slightly larger than that of the inner cylindrical section 4. The 11 protruding guide posts 13 that are equipped with of outer cylinder section inner wall, guide post 13 sets up in the both ends of every outer arc backup pad 12, extend along the internal diameter direction, guide post 13 is inserted and is located in guide way 6, can slide in guide way 6, consequently, can couple together inner arc backup pad 5 and outer arc backup pad 12, when the anchor section is strutted, inner arc backup pad 5 expands, guide post 13 that drives outer arc backup pad 12 slides along guide way 6, make outer arc backup pad 12 upwards slide at its cambered surface method, can be strutted, nevertheless can not break away from inner arc backup pad 5.
As shown in fig. 1, fig. 3 and fig. 6, the head end of the outer cylindrical section 11 exceeds the head end of the inner cylindrical section 4, the tail end of the inner cylindrical section 4 exceeds the tail end of the outer cylindrical section 11, the head ends of the inner cylindrical section 4 and the outer cylindrical section 11 are both provided with end plates 18, and the end plates 18 are provided with round holes 19, in this embodiment, the end plates 18 are connected at the head ends of the inner arc-shaped support plate 5 and the outer arc-shaped support plate 12, each end plate 18 is provided with three round holes 19, and the positions of the six round holes 19 are staggered with each other and are not on the same cross section.
As shown in fig. 1 and 7, the free section includes an anchor cable connection disc 20, a force transmission steel strand 21, a tension steel strand 22 and a cable feeder 23, the force transmission steel strand 21 is connected between the head ends of the inner cylindrical section 4 and the outer cylindrical section 11 and the anchor cable connection disc 20, one side of the anchor cable connection disc 20 away from the anchoring section is connected with the tension steel strand 22 capable of being tensioned, and the cable feeder 23 penetrates through the center of the anchor cable connection disc 20. In this embodiment, there are six force transmission steel strands 21 connected between the circular holes 19 of the end plates 18 and the anchor cable connecting discs 20. Nine holes are symmetrically arranged on the anchor cable connecting disc 20, wherein six holes are respectively connected with six force transmission steel strands 21, and the other three holes are used for connecting tensioning steel strands 22.
Referring to fig. 9, the cable feeder 23 includes a plurality of support tubes 24 with hollow openings for the central steel strand 10 to pass through, adjacent support tubes 24 are connected by a connector 25, and ends 26 are provided at both ends of the support tubes 24. The support tube 24 is a hollow open type circular tube, and the length can be made to be 1.5m, 2m, 2.5m, 3m and the like. The cable feeder 23 corresponds to the length of the free segment. The cable feeder 23 penetrates through the center of the cable connecting disc 20 and abuts against the end face of the first supporting seat 15.
One end of the central steel strand 10 passes through the inner cylindrical section 4 and is fixedly connected to the second support seat 17 through the clamping piece 27, and the other end passes through the first support seat 15 and the cable feeder 23 and is connected to the cable tensioner, in this embodiment, the diameter of the central steel strand 10 is 15.2 mm.
Preferably, the outer surface of the outer arc-shaped supporting plate 12 is subjected to pitted surface treatment, so that the friction coefficient between the anchoring section and the soil body can be increased, the friction force is increased, and the anchoring performance is improved. When the soil quality is poor and the compression deformation of the soil body is overlarge, a soft capsule bag can be installed outside the anchoring section, and when the anchor cable is stretched, the soft capsule bag can fill the limitation of the diameter of the expanded anchoring section due to the overlarge deformation, and can also maintain the friction force between the anchoring section and the soil body.
The invention also provides a construction method based on the internal expansion type grouting-free recoverable anchor cable, which comprises the following steps:
the method comprises the following steps: and (3) feeding the anchor cable, welding the first section 1, the plurality of standard sections 2 and the tail section 3 according to design requirements, assembling and connecting the anchoring section and the free section, winding and fixing the outside by using an adhesive tape, and pushing the tail section 3 into the drill hole until the tail section reaches the bottom position of the drill hole.
Step two: and opening the inner support, enabling the central steel strand 10 to penetrate through the cable feeder 23, enabling the cable feeder 23 to extend into the cable connecting disc 20 from the center and be propped against the end part of the first supporting seat 15, enabling the central steel strand 10 to be connected with the cable stretching machine through a single-hole lock outside the cable feeder 23, and enabling the cable to be not connected with external equipment at the moment, namely, the cable is not in a waist beam state. The anchor cable stretching machine is started to pull the central steel strand 10 to drive the expander to expand, the round platform type inner expanding plug 9 moves towards the pointed conical part of the conical hole 8 to stretch the inner arc-shaped supporting plate 5 and the outer arc-shaped supporting plate 12, the outer arc-shaped supporting plate 12 slides along the guide groove 6, the anchoring section is enabled to form a hexagonal arc-shaped special-shaped cross section, and when the pressure value of the anchor cable stretching machine is stable, the central steel strand 10 is locked in the single-hole lockset.
Step three: tensioning the anchor cable, after the free-section external devices (the waist beam and the base plate) are installed, connecting the tensioning steel strand 22 and the central steel strand 10 to the anchor cable tensioning machine after passing through the multi-hole lock, in this embodiment, passing three tensioning steel strands 22 and one central steel strand 10 through the four-hole lock together. And then starting the anchor cable tensioning machine to simultaneously pull the tensioning steel strand 22 and the central steel strand 10, and locking the tensioning steel strand 22 and the central steel strand 10 in the four-hole lock after the tensioning value meets the design requirement.
Step four: and (3) recovering the anchor cable, when the support force of the anchor cable is not needed any more, cutting off the central steel strand 10 and the tensioning steel strand 22 after external equipment (waist beam), gradually releasing the prestress, returning the circular truncated cone type inner expansion plug 9 to the position before tensioning, pulling out the anchor cable after all the stress is balanced, recovering and recycling the anchor cable, and reducing the cost.
After the anchor cable is tensioned, the anchoring section forms a hexagonal arc-shaped special-shaped cross section, so that the contact area with a soil body can be increased, and the anchoring force of the anchoring section is better improved. The traditional grouting anchoring mode is changed through the internal expansion type anchoring method, the recoverable effect can be achieved, grouting is not needed, the surrounding soil body is prevented from being polluted, the anchor cable can be repeatedly used, and the cost is reduced. The invention is suitable for supporting various soil bodies and has wide application range.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. An internal expanding grouting-free recoverable anchor cable is characterized by comprising: the anchor comprises an anchor section and a free section connected to one end of the anchor section, the anchor section comprises an inner cylindrical section formed by a plurality of inner arc-shaped supporting plates and an outer cylindrical section formed by a plurality of outer arc-shaped supporting plates, the outer cylindrical section is arranged on the periphery of the inner cylindrical section, a guide column is arranged on the inner wall of the outer cylindrical section, a guide groove is arranged on the inner cylindrical section along the circumferential direction of the inner cylindrical section, the guide column is inserted in the guide groove and can slide in the guide groove, an expander is arranged in the inner cylindrical section, a central steel strand is fixedly arranged in the expander in a penetrating way, one end of the inner cylindrical section, close to the free section, is connected to a first supporting seat through a first supporting connecting rod, the other end of the inner cylindrical section, far away from the free section, is connected to a second supporting seat through a second supporting connecting rod, the free section comprises a force transmission steel strand, and is connected between the end parts of the inner cylindrical section and the outer cylindrical section and an anchor cable, one side, far away from the anchoring section, of the anchor cable connecting disc is connected with a tensioned steel strand, a cable feeder is arranged in the center of the anchor cable connecting disc in a penetrating mode, one end of the cable feeder abuts against the first supporting seat, one end of the central steel strand is connected to the second supporting seat, and the other end of the central steel strand penetrates through the first supporting seat and the cable feeder and is tensioned;
the inner cylindrical section is formed by encircling three inner arc-shaped supporting plates in the circumferential direction, the outer cylindrical section is formed by encircling three outer arc-shaped supporting plates in the circumferential direction, when the central steel strand is tensioned, the inner cylindrical section and the outer cylindrical section are propped open by the expander, and the anchoring section forms a hexagonal arc-shaped special-shaped cross section.
2. The internally expanding slip-free recoverable anchor cable of claim 1, wherein: the anchoring section is sequentially divided into a head section, a plurality of sections of standard sections and a tail section along the axial direction of the anchoring section, and the head section is connected with the standard sections, is adjacent to the standard sections and is connected with the standard sections in a welding mode.
3. The internally expanding slip-free recoverable anchor cable of claim 1, wherein: the expander comprises a support fixed on the inner wall of the inner cylindrical section, a tapered hole is formed in one side, away from the free section, of the support, a circular truncated cone type inner expansion plug is arranged in the tapered hole, the central steel strand is fixed on the circular truncated cone type inner expansion plug through a clamping piece, and when the central steel strand is tensioned, the circular truncated cone type inner expansion plug moves towards a pointed cone part of the tapered hole to stretch the inner cylindrical section and the outer cylindrical section.
4. The internally expanding slip-free recoverable anchor cable of claim 1, wherein: one end of each inner arc-shaped supporting plate is hinged to the first supporting seat through the first supporting connecting rod, and the other end of each inner arc-shaped supporting plate is hinged to the second supporting seat through the second supporting connecting rod.
5. The internally expanding slip-free recoverable anchor cable of claim 1, wherein: and end plates are arranged at the ends, facing the free section, of the inner cylindrical section and the outer cylindrical section, and round holes are formed in the end plates and used for the force transmission steel strands to penetrate through and be fixed.
6. The internally expanding, slip-free and recoverable anchor cable of claim 5, wherein: nine holes are symmetrically arranged on the anchor cable connecting disc, six holes are connected with the force transmission steel strand, and the other three holes are used for connecting the tension steel strand.
7. The internally expanding slip-free recoverable anchor cable of claim 1, wherein: the cable feeder comprises a plurality of supporting tubes, each supporting tube is provided with a hollow opening for the central steel strand to pass through, the adjacent supporting tubes are connected through a connector, and ends are arranged at two ends of each supporting tube.
8. The internally expanding slip-free recoverable anchor cable of claim 1, wherein: and a soft capsule bag is arranged outside the anchoring section.
9. The construction method of the internal expanding grouting-free recoverable anchor cable according to claim 1, wherein the construction method comprises the following steps:
the method comprises the following steps: feeding an anchor cable, assembling and connecting the anchoring section and the free section, winding and fixing the outside by using an adhesive tape, and pushing the anchor cable into the drill hole from one end far away from the free section until the anchor cable reaches the bottom position of the drill hole;
step two: opening an inner support, enabling the central steel strand to penetrate through the cable feeder, enabling the cable feeder to extend from the center of the anchor cable connecting disc and to be jacked to the end portion of the first supporting seat, enabling the central steel strand to be connected with an anchor cable stretching machine through a single-hole lock outside the cable feeder, starting the anchor cable stretching machine to pull the central steel strand, driving the expander to expand, stretching the inner arc-shaped supporting plate and the outer arc-shaped supporting plate, and locking the central steel strand in the single-hole lock when the pressure value of the anchor cable stretching machine is stable;
step three: after the free-section external equipment is installed, the tensioning steel strand and the central steel strand penetrate through a porous lock and then are connected to an anchor cable tensioning machine, the anchor cable tensioning machine is started to simultaneously pull the tensioning steel strand and the central steel strand, and after a tensioning value reaches a design requirement, the tensioning steel strand and the central steel strand are locked in the porous lock;
step four: and (4) recovering the anchor cable, cutting off the central steel strand and the tensioning steel strand after external equipment when the anchor cable is no longer required to provide supporting force, gradually releasing the prestress, returning the expander to the position before tensioning, and pulling out the anchor cable after the stress is restored to balance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710580433.2A CN107152022B (en) | 2017-07-17 | 2017-07-17 | Internal expansion type grouting-free recyclable anchor cable and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710580433.2A CN107152022B (en) | 2017-07-17 | 2017-07-17 | Internal expansion type grouting-free recyclable anchor cable and construction method thereof |
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| CN108330965B (en) * | 2018-02-14 | 2020-10-27 | 上海城建职业学院 | Anchoring device for civil construction |
| CN108547290B (en) * | 2018-06-15 | 2023-11-21 | 中冶沈勘工程技术有限公司 | Three-wing spiral top expansion type recoverable anchor cable and construction method thereof |
| CN109113773A (en) * | 2018-08-21 | 2019-01-01 | 中铁工程设计咨询集团有限公司 | A kind of quick tensioning anchor cable structure and its construction method |
| CN109898509B (en) * | 2019-03-27 | 2020-11-13 | 中建一局集团第二建筑有限公司 | Use method of ultra-long anchor cable sliding groove |
| CN112127927B (en) * | 2020-09-28 | 2023-07-25 | 赵津梁 | Single-recyclable anchor rod |
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| CN102650132B (en) * | 2012-05-15 | 2014-09-10 | 中国京冶工程技术有限公司 | Embedded recoverable expansion anchor cable and construction method thereof |
| CN106917411B (en) * | 2017-03-16 | 2023-08-04 | 廖萍 | Pulling-pressing complementary type external anchoring locking anchor cable structure and construction method thereof |
| CN207062946U (en) * | 2017-07-17 | 2018-03-02 | 中冶沈勘工程技术有限公司 | Internal-expansion type exempts from slip casting Recyclable anchor rope |
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