CN110952543A - The second-generation extruded anchor type recyclable anchor cable and its recovery method - Google Patents
The second-generation extruded anchor type recyclable anchor cable and its recovery method Download PDFInfo
- Publication number
- CN110952543A CN110952543A CN202010020251.1A CN202010020251A CN110952543A CN 110952543 A CN110952543 A CN 110952543A CN 202010020251 A CN202010020251 A CN 202010020251A CN 110952543 A CN110952543 A CN 110952543A
- Authority
- CN
- China
- Prior art keywords
- anchor
- steel strand
- extrusion
- sleeve
- wire
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000011084 recovery Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 153
- 239000010959 steel Substances 0.000 claims abstract description 153
- 238000001125 extrusion Methods 0.000 claims abstract description 112
- 230000001681 protective effect Effects 0.000 claims abstract description 58
- 238000004064 recycling Methods 0.000 claims description 16
- 239000002002 slurry Substances 0.000 claims description 9
- 238000005553 drilling Methods 0.000 claims description 6
- 238000005260 corrosion Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 239000003973 paint Substances 0.000 claims description 4
- 239000004568 cement Substances 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 239000013589 supplement Substances 0.000 claims description 3
- 238000010276 construction Methods 0.000 description 6
- 238000004873 anchoring Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Images
Classifications
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The second generation of extrusion anchor type recoverable anchor cable and recovery method thereof, wherein an extrusion wire sleeve is positioned in the extrusion anchor and outside a steel strand; the wire taper sleeve is arranged at the tail end of the steel strand and sleeves the steel wire in the middle of the steel strand; the limiter and the hexagonal nut are positioned in the upper protective sleeve; the force measuring ring is arranged in the lower protective sleeve and extrudes the lower part of the anchor; the plastic pipe is meshed with threads in a plastic sleeve joint at the front end of the lower protective sleeve, and the bearing plate is connected with the lower protective sleeve through a round nut; the method comprises the following steps: when the device is used for tensioning the anchor cable, the bottom of the extrusion anchor is tightly contacted with the force measuring ring, and the anchor cable tensioning operation is carried out; the first method comprises the following steps: rotating the steel strand clockwise, firstly pulling the wire taper sleeve out of the steel strand, then pulling the steel strand out of the extrusion anchor for recovery, pulling the steel strand out of the plastic pipe, and completing the recovery of the anchor rope; the second method comprises the following steps: the straight steel wire at the center of the steel strand is firstly pulled out of the extrusion anchor by a jack, and then the steel wire around the tail end of the steel strand is pulled out of the extrusion anchor, so that the steel strand is pulled out of the plastic pipe.
Description
Technical Field
The invention relates to the technical field of building foundation pit supporting, in particular to a second-generation extrusion anchor type recoverable anchor cable technology.
Background
With the acceleration of the urbanization process, the land available for building development in cities is less and less, so that the development of underground spaces is hotter and hotter, and the number of the generated deep foundation pits is large. The anchor cable is used as a flexible supporting structure, deformation of the deep foundation pit can be well controlled, and stability of the foundation pit is improved, so that the anchor cable supporting structure is adopted in a plurality of building foundation pits. In a foundation pit supported by a traditional anchor cable, the anchor cable is buried underground as building garbage, so that underground space pollution is caused, the construction of subsequent buildings is seriously influenced, and particularly the construction of urban subways and underground shopping malls is influenced. If the traditional anchor cable support is replaced by the recoverable anchor cable support, the construction cost can be reduced, the resources are saved, and the pollution is reduced.
Although the types of recoverable anchor cables researched and developed in China are more, most of recoverable anchor cable devices have the problems of complex structure, difficulty in recovery, intentional damage to used steel strands, unsafe recovery and the like, and cannot be safely and reliably applied to temporary building foundation pits. Therefore, there is a need to develop a recoverable anchor cable that is more economical, reliable and safe to solve the above problems.
Disclosure of Invention
The invention aims to provide a second generation extrusion anchor type recyclable anchor cable and a recycling method, wherein the second generation extrusion anchor type recyclable anchor cable is simple in structure, high in anchoring force, high in safety, high in recycling rate, convenient to operate and capable of monitoring the anchoring force of the anchor cable.
The invention relates to a second generation extrusion anchor type recoverable anchor cable and a recovery method, the second generation extrusion anchor type recoverable anchor cable comprises a steel strand 1, a plastic pipe 2, a plastic pipe connector 3, a round nut 4, a bearing plate 5, a lower protective sleeve 6, an extrusion anchor 7, an extrusion screw sleeve 8, a screw cone sleeve 9, a limiter 10, a hexagon nut 11, an upper protective sleeve 12 and a force measuring ring 13, wherein the screw cone sleeve 9 is arranged on a middle steel wire at the tail end of the steel strand 1; the extrusion wire sleeve 8 is arranged at the tail end of the steel strand 1 of the existing wire taper sleeve 9; the extrusion anchor 7 is arranged outside the extrusion thread sleeve 8, and the extrusion anchor 7, the extrusion thread sleeve 8, the steel strand 1 and the thread taper sleeve 9 are firmly extruded together under the action of an extruder; the limiter 9 and the hexagonal nut 11 are arranged in an upper protective sleeve 12; the force measuring ring 13 is arranged in the lower protective sleeve 6 and is positioned at the bottom of the extrusion anchor 7; the upper protective sleeve 12 and the lower protective sleeve 6 are meshed together through threads; the plastic pipe 2 is connected with the plastic sleeve connector 3 at the front end of the lower protective sleeve 6 in an occluded mode through threads, and the bearing plate 5 is connected with the lower protective sleeve 6 through the round nut 4.
The invention relates to a method for recovering a second generation extrusion anchor type recoverable anchor cable, which comprises the following steps:
(1) drilling: drilling at the corresponding position of the foundation pit according to the requirements of a design drawing;
(2) manufacturing a second generation extrusion anchor type recoverable anchor cable: performing anti-corrosion treatment on the whole steel strand 1, then installing a screw taper sleeve 9 at the tail end of the steel strand 1, enabling the hollow part of the screw taper sleeve 9 to be completely sleeved on a middle steel wire at the tail end of the steel strand 1, then installing an extrusion screw sleeve 8 outside the tail end of the steel strand 1, then installing an extrusion anchor 7 outside the extrusion screw sleeve 8, and firmly extruding the extrusion anchor 7, the extrusion screw sleeve 8, the steel strand 1 and the screw taper sleeve 9 together under the action of an extruder; a hexagonal nut 11 and a stopper 10 are arranged at corresponding positions in the upper protective sleeve 12; then installing the extruded extrusion anchor 7 in the lower protective sleeve 6, and then connecting the manufactured upper protective sleeve 12 with the lower protective sleeve 6 provided with the extrusion anchor 7 and the force measuring ring 13 together through thread occlusion; then, the force measuring ring data wire 14 is led to follow the steel strand 1, and then the plastic pipe 2 is led to pass through the steel strand 1 and the force measuring ring data wire 14, so that the plastic pipe 2 is connected with the plastic pipe interface 3 in a meshing way through threads; finally, the bearing plate 5 and the lower protective sleeve 6 are connected together through the round nut 4, so that the installation of the second generation extrusion anchor type recyclable anchor cable is completed, and then antirust paint is sprayed outside the bearing plate and the protective sleeve;
(3) perforating: penetrating the manufactured second generation extrusion anchor type recoverable anchor cable and the grouting pipe into the hole;
(4) grouting: preparing cement slurry according to a design mixing proportion, wherein the grouting operation is strictly carried out according to pressure grouting, hole bottom slurry return, hole opening slurry supplement and secondary grouting operation;
(5) tensioning: after the strength of the grouting body meets the tensioning requirement, the steel strand 1 is rotated anticlockwise, so that the extrusion anchor 7 is in contact with the force measuring ring 13 and further in close contact with the lower protective sleeve 6, then tensioning is carried out by adopting a center-penetrating jack, ultra-tensioning is adopted for tensioning, and after the tensioning value is stable, the outer end of the steel strand 1 is locked;
(6) and (4) anchor cable recovery: treat that the foundation ditch accomplishes the engineering, no longer need the anchor rope when, need carry out the recovery operation to the anchor rope, the recovery operation has two kinds of modes, and the first kind is: firstly, removing a working anchorage outside a foundation pit, then clockwise rotating the steel strand 1, enabling the screw cone sleeve 9 together with the extrusion anchor 7 and the steel strand 1 to pass through a hexagon nut 11 for a certain distance, enabling the extrusion anchor 7 to be in tight contact with a limiter 10, pulling the steel strand 1 by using a single tensioning jack to pull out the screw cone sleeve 9 from the tail end of the steel strand 1, then continuously tensioning the steel strand 1 by using the jack to pull out the steel strand 1 from the extrusion anchor 7, and finally pulling out the steel strand 1 from the plastic pipe 2 by manpower, thus completing the recovery of the steel strand 1;
the second recovery mode is as follows: firstly, removing the working anchorage device of the anchor cable, then tensioning the straight steel wire in the middle of the steel strand 1 by using a jack to pull out the straight steel wire from the extrusion anchor 7, then tensioning the whole steel strand 1 to pull out 6 steel wires at the tail end of the steel strand 1 from the extrusion anchor 7, and finally manually pulling out the steel strand 1 from the plastic pipe 2 to finish the recovery of the steel strand 1; the two recycling modes firstly push a first recycling mode, and if the first recycling mode cannot be realized, a second recycling mode is directly used.
The invention has the beneficial effects that:
(1) the wire taper sleeve is sleeved on the middle steel wire at the tail end of the steel strand, so that the outer diameter of the tail end of the steel strand is increased, the extrusion wire sleeve is made of the spring wire made of high-strength materials, the extrusion anchor can be firmly sleeved on the steel strand and the taper sleeve under the action of the extruder, and the steel strand is pulled more and more tightly due to the fact that the wire taper sleeve is provided with an angle, so that reliable anchoring force can be provided when the anchor cable is pulled.
(2) When the invention is used for recovery operation, two recovery modes are provided, the first mode is as follows: rotate steel strand wires clockwise earlier, let the silk taper sleeve pass through hexagon nut certain distance, make extrusion anchor and dynamometer empty certain distance, because hexagon nut can restrict the silk taper sleeve and remove, and the stopper can restrict hexagon nut and remove, when the steel strand wires bore the pulling force this moment, can let the silk taper sleeve extract from the steel strand wires end, because the intensity and the hardness of silk taper sleeve are all very high, and the taper sleeve area angle, can bear very high pulling force, thereby let the light follow steel strand wires of silk taper sleeve extract. And because the outer diameter of the wire taper sleeve is larger than the outer diameter of the middle steel wire of the steel strand, the clearance of the 6 steel wires around the steel strand is increased, so that after the wire taper sleeve is pulled out from the tail end of the steel strand, the 6 steel wires around the tail end of the steel strand can contract under the action of the tension of an external jack, the steel strand is slowly pulled out from the extrusion anchor under the action of small tension, and finally the steel strand is pulled out manually. The second method is as follows: because the steel wire in the middle of the steel strand is straight and the inner diameter of the wire taper sleeve is larger than the outer diameter of the middle steel wire, the middle steel wire can be easily pulled out from the extrusion anchor under the action of an external jack; after stretch-draw steel strand wires, because the external diameter of wire taper sleeve is greater than middle steel wire external diameter, make the terminal ring of steel strand wires root steel wire's clearance increase, after the steel wire in the middle of extracting the extrusion anchor, 6 steel wires of ring can shrink, and wire taper sleeve hexagon nut is linked together, the wire taper sleeve can not take place to remove, so stretch-draw steel strand wires with the jack this moment, 6 steel wires of ring can make the most advanced deformation of wire taper sleeve, thereby make steel strand wires very light, safe follow the extrusion anchor and extract, the manpower can be pulled out steel strand wires from the plastic tubing at last, accomplish the anchor rope and retrieve. Because the recovery of the anchor cable has 2 methods, the recovery rate of the anchor cable can be greatly improved, and the whole recovery process is safe and easy.
(3) The whole device of the invention has simple structure, small volume and light weight, so that workers can easily assemble and manufacture the device in the actual foundation pit supporting construction, and the device is easy for perforation operation, convenient for transportation and construction and improves the construction efficiency.
(4) Because the surfaces of the steel strand and the whole device are subjected to anti-corrosion treatment, and the plastic pipe plays a role in sealing and protecting the steel strand and the protective sleeve, the recycled steel strand is not rusted, so that the steel strand can be repeatedly used, and the effects of saving resources and recycling wastes are achieved.
(5) Because the protective sheath is the thread interlock connection, and plastic tubing interface also are the thread interlock connection, and whole device spraying anti-rust paint in addition, so can prevent that inside extrusion anchor, steel strand wires, screw taper sleeve, hexagon nut and the stopper of protective sheath can not take place the corrosion, make whole device can play a role always to improve the device's reliability, improve the device's rate of recovery.
(6) Because the force measuring ring of the anchor cable is arranged inside, on one hand, the change of the internal force of the anchor cable can be monitored in real time, so that the stress condition of the whole foundation pit can be reversely deduced, reliable and real data are provided for the stability analysis of the foundation pit, the deformation of the foundation pit is predicted in advance, and the major foundation pit collapse accident is prevented. On the other hand, the stress of the extrusion anchor can be monitored, so that the reliability of the second generation extrusion anchor type recoverable anchor cable can be calculated.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention, fig. 2 is a schematic view of a partial structure of the present invention, fig. 3 is a schematic view of an upper protective cover and a partial structure of the present invention, fig. 4 is a cross-sectional view taken along line a-a of fig. 3, and reference numerals and corresponding names are as follows: the device comprises a steel strand 1, a plastic pipe 2, a plastic pipe connector 3, a round nut 4, a bearing plate 5, a lower protective sleeve 6, an extrusion anchor 7, an extrusion thread sleeve 8, a thread taper sleeve 9, a limiter 10, a hexagonal nut 11, an upper protective sleeve 12, a force measuring ring 13 and a force measuring ring data wire 14.
Detailed Description
As shown in fig. 1 to 4, the invention relates to a second generation extrusion anchor type recoverable anchor cable and a recovery method, the second generation extrusion anchor type recoverable anchor cable comprises a steel strand 1, a plastic pipe 2, a plastic pipe connector 3, a round nut 4, a bearing plate 5, a lower protective sleeve 6, an extrusion anchor 7, an extrusion thread sleeve 8, a thread cone sleeve 9, a stopper 10, a hexagonal nut 11, an upper protective sleeve 12 and a force measuring ring 13, wherein the thread cone sleeve 9 is arranged on a middle steel wire at the tail end of the steel strand 1; the extrusion wire sleeve 8 is arranged at the tail end of the steel strand 1 of the existing wire taper sleeve 9; the extrusion anchor 7 is arranged outside the extrusion thread sleeve 8, and the extrusion anchor 7, the extrusion thread sleeve 8, the steel strand 1 and the thread taper sleeve 9 are firmly extruded together under the action of an extruder; the limiter 9 and the hexagonal nut 11 are arranged in an upper protective sleeve 12; the force measuring ring 13 is arranged in the lower protective sleeve 6 and is positioned at the bottom of the extrusion anchor 7; the upper protective sleeve 12 and the lower protective sleeve 6 are meshed together through threads; the plastic pipe 2 is connected with the plastic sleeve connector 3 at the front end of the lower protective sleeve 6 in an occluded mode through threads, and the bearing plate 5 is connected with the lower protective sleeve 6 through the round nut 4.
As shown in figures 1 and 2, the screw taper sleeve 9 is made of a high-strength screw rod, the outer diameter of the screw taper sleeve is 8-12 mm, the inner diameter of the screw taper sleeve is 5.3-5.4 mm, the inner hole depth of the screw taper sleeve is 4-6 cm, the length of the screw taper sleeve is 8-12 cm, the angle of the screw taper sleeve is 2-3 degrees, the Rockwell hardness of the screw taper sleeve is 38-50 HRC, the thin wall of the hollow part of the screw taper sleeve is cut into 3 uniform sections by laser, and a shrinkage hole is formed in the middle of the bottom of each.
As shown in fig. 1 and 2, the extrusion wire sleeve 8 is made of a high-strength spring wire, the outer diameter of the high-strength spring wire is 20mm, and the inner diameter of the high-strength spring wire is 18 mm.
As shown in figures 1 and 2, the extrusion anchor 7 is made of steel, has an outer diameter of 34 to 36mm, a length of 50 to 60mm, an inner diameter of 21mm at one end and an inner diameter of 24 to 26mm at the other end, and has an extrusion force of 16 to 22MPa under the action of an extruder.
As shown in fig. 1 to 4, the stopper 10 is made of steel, has the same outer diameter as the maximum inner diameter of the upper protective sleeve 12, has an inner diameter 1 to 2mm larger than the outer diameter of the screw taper sleeve (9), has a thickness of 10 to 15mm, and restricts the hexagonal nut 11 from moving downward.
As shown in FIG. 1, the material of the bearing plate 5 is steel, the shape is circular, the thickness is 10-15 mm, the outer diameter is 100-130 mm, the diameter of the opening is the same as the outer diameter of the plastic pipe connector 3, and the number of the openings is 4-7.
As shown in fig. 1 and 3, the hexagonal nut 11 is a high-strength nut with a grade of 8.8-12.9, and the size of the hexagonal nut is matched with that of the screw taper sleeve 9.
As shown in fig. 1, the plastic pipe 2 is made of a PE pipe, the outer diameter of the plastic pipe is the same as the inner diameter of the plastic pipe joint 3, the length of the plastic pipe is the same as the length of the steel strand 1, and a thread is turned on one end of the plastic pipe by a die so as to be tightly engaged with the plastic pipe joint 3.
As shown in fig. 1 and 2, the force measuring ring 13 is a single-beam anchor cable dynamometer. The size of the anchor cable is designed independently according to the size of the lower protective sleeve 6, and the anchor cable is used for monitoring the axial force of the anchor cable and the stress of the extruded anchor.
The invention relates to a method for recovering a second generation extrusion anchor type recoverable anchor cable, which comprises the following steps:
(1) drilling: drilling at the corresponding position of the foundation pit according to the requirements of a design drawing;
(2) manufacturing a second generation extrusion anchor type recoverable anchor cable: performing anti-corrosion treatment on the whole steel strand 1, then installing a screw taper sleeve 9 at the tail end of the steel strand 1, enabling the hollow part of the screw taper sleeve 9 to be completely sleeved on a middle steel wire at the tail end of the steel strand 1, then installing an extrusion screw sleeve 8 outside the tail end of the steel strand 1, then installing an extrusion anchor 7 outside the extrusion screw sleeve 8, and firmly extruding the extrusion anchor 7, the extrusion screw sleeve 8, the steel strand 1 and the screw taper sleeve 9 together under the action of an extruder; a hexagonal nut 11 and a stopper 10 are arranged at corresponding positions in the upper protective sleeve 12; then installing the extruded extrusion anchor 7 in the lower protective sleeve 6, and then connecting the manufactured upper protective sleeve 12 with the lower protective sleeve 6 provided with the extrusion anchor 7 and the force measuring ring 13 together through thread occlusion; then, the force measuring ring data wire 14 is led to follow the steel strand 1, and then the plastic pipe 2 is led to pass through the steel strand 1 and the force measuring ring data wire 14, so that the plastic pipe 2 is connected with the plastic pipe interface 3 in a meshing way through threads; finally, the bearing plate 5 and the lower protective sleeve 6 are connected together through the round nut 4, so that the installation of the second generation extrusion anchor type recyclable anchor cable is completed, and then antirust paint is sprayed outside the bearing plate and the protective sleeve;
(3) perforating: penetrating the manufactured second generation extrusion anchor type recoverable anchor cable and the grouting pipe into the hole;
(4) grouting: preparing cement slurry according to a design mixing proportion, wherein the grouting operation is strictly carried out according to pressure grouting, hole bottom slurry return, hole opening slurry supplement and secondary grouting operation;
(5) tensioning: after the strength of the grouting body meets the tensioning requirement, the steel strand 1 is rotated anticlockwise, so that the extrusion anchor 7 is in contact with the force measuring ring 13 and further in close contact with the lower protective sleeve 6, then tensioning is carried out by adopting a center-penetrating jack, ultra-tensioning is adopted for tensioning, and after the tensioning value is stable, the outer end of the steel strand 1 is locked;
(6) and (4) anchor cable recovery: treat that the foundation ditch accomplishes the engineering, no longer need the anchor rope when, need carry out the recovery operation to the anchor rope, the recovery operation has two kinds of modes, and the first kind is: firstly, removing a working anchorage outside a foundation pit, then clockwise rotating the steel strand 1, enabling the screw cone sleeve 9 together with the extrusion anchor 7 and the steel strand 1 to pass through a hexagon nut 11 for a certain distance, enabling the extrusion anchor 7 to be in tight contact with a limiter 10, pulling the steel strand 1 by using a single tensioning jack to pull out the screw cone sleeve 9 from the tail end of the steel strand 1, then continuously tensioning the steel strand 1 by using the jack to pull out the steel strand 1 from the extrusion anchor 7, and finally pulling out the steel strand 1 from the plastic pipe 2 by manpower, thus completing the recovery of the steel strand 1;
the second recovery mode is as follows: firstly, removing the working anchorage device of the anchor cable, then tensioning the straight steel wire in the middle of the steel strand 1 by using a jack to pull out the straight steel wire from the extrusion anchor 7, then tensioning the whole steel strand 1 to pull out 6 steel wires at the tail end of the steel strand 1 from the extrusion anchor 7, and finally manually pulling out the steel strand 1 from the plastic pipe 2 to finish the recovery of the steel strand 1; the two recycling modes firstly push a first recycling mode, and if the first recycling mode cannot be realized, a second recycling mode is directly used.
Claims (10)
1. Recoverable anchor rope of second generation's extrusion anchor formula, including steel strand wires (1), plastic tubing (2), plastic tubing interface (3), round nut (4), loading board (5), lower protective sheath (6), extrusion anchor (7), extrusion silk cover (8), screw cone cover (9), stopper (10), hexagon nut (11), go up protective sheath (12), dynamometry ring (13), its characterized in that: the wire taper sleeve (9) is arranged on a middle steel wire at the tail end of the steel strand (1); the extrusion screw sleeve (8) is arranged at the tail end of the steel strand (1) of the existing screw taper sleeve (9); the extrusion anchor (7) is arranged outside the extrusion thread sleeve (8), and the extrusion anchor (7), the extrusion thread sleeve (8), the steel strand (1) and the thread taper sleeve (9) are firmly extruded together under the action of the extruder; the limiter (9) and the hexagonal nut (11) are arranged in the upper protective sleeve (12); the force measuring ring (13) is arranged in the lower protective sleeve (6) and is positioned at the bottom of the extrusion anchor (7); the upper protective sleeve (12) and the lower protective sleeve (6) are meshed together through threads; the plastic pipe (2) is connected with the screw thread in the plastic sleeve connector (3) at the front end of the lower protective sleeve (6) in an occlusion manner, and the bearing plate (5) is connected with the lower protective sleeve (6) through the round nut (4).
2. A second generation squeeze anchor, retrievable anchor line as claimed in claim 1, wherein: the screw taper sleeve (9) is made of a high-strength screw rod, the outer diameter of the screw taper sleeve is 8-12 mm, the inner diameter of the screw taper sleeve is 5.3-5.4 mm, the inner hole depth is 4-6 cm, the length of the screw taper sleeve is 8-12 cm, the angle of the screw taper sleeve is 2-3 degrees, the Rockwell hardness of the screw taper sleeve is 38-50 HRC, the thin wall of the hollow part of the screw taper sleeve is cut into 3 uniform sections by laser, and a shrinkage hole is formed in the middle of the bottom of each section.
3. A second generation squeeze anchor, retrievable anchor line as claimed in claim 1, wherein: the extrusion wire sleeve (8) is made of high-strength spring wires, the outer diameter of the high-strength spring wires is 20mm, and the inner diameter of the high-strength spring wires is 18 mm.
4. A second generation squeeze anchor, retrievable anchor line as claimed in claim 1, wherein: the extrusion anchor (7) is made of steel, the outer diameter of the extrusion anchor is 34-36 mm, the length of the extrusion anchor is 50-60 mm, the inner diameter of one end of the extrusion anchor is 21mm, the inner diameter of the other end of the extrusion anchor is 24-26 mm, and the extrusion force under the action of the extruder is 16-22 MPa.
5. A second generation squeeze anchor, retrievable anchor line as claimed in claim 1, wherein: the material of stopper (10) is steel, and its external diameter is the same with the biggest interior warp of last protective sheath (12), and interior warp is than the external diameter of screw taper sleeve (9) is 1~2mm big, and thickness is 10~15mm, restriction hexagon nut (11) downstream.
6. A second generation squeeze anchor, retrievable anchor line as claimed in claim 1, wherein: the bearing plate (5) is made of steel, is circular, 10-15 mm in thickness and 100-130 mm in outer diameter, and has the same opening diameter as the outer diameter of the plastic pipe connector (3) and 4-7 openings.
7. A first generation squeeze anchor, retractable anchor line according to claim 1, wherein: the hexagonal nut (11) is a high-strength nut, the grade is 8.8-grade to 12.9-grade, and the size of the hexagonal nut is matched with that of the screw taper sleeve (9).
8. A second generation squeeze anchor, retrievable anchor line as claimed in claim 1, wherein: the plastic pipe (2) is made of a PE pipe, the outer diameter of the plastic pipe is the same as the inner diameter of the plastic pipe interface (3), the length of the plastic pipe interface is the same as the length of the steel strand (1), and threads are turned on one end of the plastic pipe interface by using a die so as to be tightly engaged with the plastic pipe interface (3).
9. A second generation squeeze anchor, retrievable anchor line as claimed in claim 1, wherein: the force measuring ring (13) is a single-beam anchor cable dynamometer.
10. A method of recovering a second generation squeeze-anchor, recyclable anchor cable according to claim 1, wherein: the method comprises the following steps:
(1) drilling: drilling at the corresponding position of the foundation pit according to the requirements of a design drawing;
(2) manufacturing a second generation extrusion anchor type recoverable anchor cable: performing anti-corrosion treatment on the whole steel strand (1), then installing a wire taper sleeve (9) at the tail end of the steel strand (1), enabling the hollow part of the wire taper sleeve (9) to be completely sleeved on a middle steel wire at the tail end of the steel strand (1), then installing an extrusion wire sleeve (8) outside the tail end of the steel strand (1), then installing an extrusion anchor (7) outside the extrusion wire sleeve (8), and firmly extruding the extrusion anchor (7), the extrusion wire sleeve (8), the steel strand (1) and the wire taper sleeve (9) together under the action of an extruder; a hexagonal nut (11) and a stopper (10) are arranged at corresponding positions in the upper protective sleeve (12); then, installing the extruded extrusion anchor (7) in the lower protective sleeve (6), and then connecting the manufactured upper protective sleeve (12) with the lower protective sleeve (6) provided with the extrusion anchor (7) and the force measuring ring (13) together through thread engagement; then, the force measuring ring data line (14) is led to pass through the steel strand (1) and the force measuring ring data line (14) along the steel strand (1), and the plastic pipe (2) is connected with the plastic pipe interface (3) in a meshed mode through threads; finally, the bearing plate (5) is connected with the lower protective sleeve (6) through the round nut (4), so that the installation of the second generation extrusion anchor type recyclable anchor cable is completed, and then antirust paint is sprayed outside the bearing plate and the protective sleeve;
(3) perforating: penetrating the manufactured second generation extrusion anchor type recoverable anchor cable and the grouting pipe into the hole;
(4) grouting: preparing cement slurry according to a design mixing proportion, wherein the grouting operation is strictly carried out according to pressure grouting, hole bottom slurry return, hole opening slurry supplement and secondary grouting operation;
(5) tensioning: when the strength of the grouting body meets the tensioning requirement, the steel strand (1) is rotated anticlockwise, so that the extrusion anchor (7) is in contact with the force measuring ring (13) and further in close contact with the lower protective sleeve (6), then tensioning operation is carried out by adopting a center-penetrating jack, ultra-tensioning is adopted for tensioning, and after the tensioning value is stable, the outer end of the steel strand (1) is locked;
(6) and (4) anchor cable recovery: treat that the foundation ditch accomplishes the engineering, no longer need the anchor rope when, need carry out the recovery operation to the anchor rope, the recovery operation has two kinds of modes, and the first kind is: firstly, removing a working anchorage outside a foundation pit, then clockwise rotating a steel strand (1), enabling a screw cone sleeve (9) together with an extrusion anchor (7) and the steel strand (1) to pass through a hexagon nut (11) for a certain distance, enabling the extrusion anchor (7) to be in close contact with a limiter (10), pulling the steel strand (1) by using a single tensioning jack to pull the screw cone sleeve (9) out of the tail end of the steel strand (1), then continuously pulling the steel strand (1) by using the jack to pull the steel strand (1) out of the extrusion anchor (7), and finally pulling the steel strand (1) out of a plastic pipe (2) by manpower, thereby completing the recovery of the steel strand (1);
the second recovery mode is as follows: firstly, removing a working anchorage device of an anchor cable, then tensioning a straight steel wire in the middle of a steel strand (1) by using a jack to pull out the straight steel wire from an extrusion anchor (7), then tensioning the whole steel strand (1) to pull out a steel wire (6) at the tail end of the steel strand (1) from the extrusion anchor (7), and finally manually pulling out the steel strand (1) from a plastic pipe (2) to finish the recovery of the steel strand (1); the two recycling modes firstly push a first recycling mode, and if the first recycling mode cannot be realized, a second recycling mode is directly used.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010020251.1A CN110952543A (en) | 2020-01-09 | 2020-01-09 | The second-generation extruded anchor type recyclable anchor cable and its recovery method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010020251.1A CN110952543A (en) | 2020-01-09 | 2020-01-09 | The second-generation extruded anchor type recyclable anchor cable and its recovery method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110952543A true CN110952543A (en) | 2020-04-03 |
Family
ID=69985650
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010020251.1A Pending CN110952543A (en) | 2020-01-09 | 2020-01-09 | The second-generation extruded anchor type recyclable anchor cable and its recovery method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110952543A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07109789A (en) * | 1993-01-11 | 1995-04-25 | Vsl Internatl Ag | Tensile fixing device for at least one tensile element extending in surrounding pipe and manufacture of tensile fixing device |
| KR20070058940A (en) * | 2005-12-05 | 2007-06-11 | 신종덕 | Internal Fixing Agent of Anchor for Tension Removal |
| CN101694098A (en) * | 2009-10-13 | 2010-04-14 | 上海智平基础工程有限公司 | Recyclable prestressed tendon for soft oil support and construction method thereof |
| CN108166491A (en) * | 2017-12-06 | 2018-06-15 | 苏州市能工基础工程有限责任公司 | The method for dismounting of steel strand wires in anchor cable |
| EP3396069A1 (en) * | 2017-04-28 | 2018-10-31 | Prometec S.r.l. | Anchoring head for an anchoring rod |
| CN209243717U (en) * | 2018-10-10 | 2019-08-13 | 宁波市建筑设计研究院有限公司 | A kind of adjustable prestressed anchor cable stretching limiter |
| CN211646382U (en) * | 2020-01-09 | 2020-10-09 | 兰州理工大学 | Second generation extrusion anchor type recoverable anchor cable |
-
2020
- 2020-01-09 CN CN202010020251.1A patent/CN110952543A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07109789A (en) * | 1993-01-11 | 1995-04-25 | Vsl Internatl Ag | Tensile fixing device for at least one tensile element extending in surrounding pipe and manufacture of tensile fixing device |
| KR20070058940A (en) * | 2005-12-05 | 2007-06-11 | 신종덕 | Internal Fixing Agent of Anchor for Tension Removal |
| CN101694098A (en) * | 2009-10-13 | 2010-04-14 | 上海智平基础工程有限公司 | Recyclable prestressed tendon for soft oil support and construction method thereof |
| EP3396069A1 (en) * | 2017-04-28 | 2018-10-31 | Prometec S.r.l. | Anchoring head for an anchoring rod |
| CN108166491A (en) * | 2017-12-06 | 2018-06-15 | 苏州市能工基础工程有限责任公司 | The method for dismounting of steel strand wires in anchor cable |
| CN209243717U (en) * | 2018-10-10 | 2019-08-13 | 宁波市建筑设计研究院有限公司 | A kind of adjustable prestressed anchor cable stretching limiter |
| CN211646382U (en) * | 2020-01-09 | 2020-10-09 | 兰州理工大学 | Second generation extrusion anchor type recoverable anchor cable |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102605780B (en) | Recyclable anchor rod for foundation pit support and construction method thereof | |
| CN107083772A (en) | A kind of internal resistance type metal shearing resistance pressure-release anchor cable device | |
| CN201924356U (en) | Detachable anchor rod | |
| CN202626984U (en) | Recyclable anchor used for foundation pit support | |
| CN103806446B (en) | Internally-supporting expansion type anchor rod | |
| CN108442386B (en) | Detachable core expansion anchoring structure device and assembly construction method thereof | |
| CN114542144B (en) | Broken surrounding rock enlarged end anchoring multi-stage yielding pressure constant resistance large deformation bolt and method | |
| CN102392444A (en) | Easily-recycled anchor rod device and recycling method | |
| CN110952543A (en) | The second-generation extruded anchor type recyclable anchor cable and its recovery method | |
| CN211646382U (en) | Second generation extrusion anchor type recoverable anchor cable | |
| CN203867598U (en) | Anchor cable capable of applying prestress repeatedly | |
| CN102635378A (en) | New process for high-strength resin anchor construction | |
| CN203049577U (en) | Complete recovery type non-grouting anchor grasping anchor cable timbering structure | |
| CN103883339A (en) | Anchor cable supporting method for repeated application of prestress | |
| CN208815519U (en) | The first generation of manual recyclable anchor cables | |
| CN2698958Y (en) | Hydraulic expansion reinforcing device for down-hole casing patch | |
| CN102678145A (en) | Efficient novel construction method for resin anchor rod | |
| CN216280057U (en) | Open caisson construction pipeline block structure | |
| CN211646381U (en) | First generation extrusion anchor type recoverable anchor cable | |
| CN102787597B (en) | Multi-cable recyclable anchor cable head connecting device | |
| CN212270974U (en) | Recoverable anchor cable structure | |
| CN204419213U (en) | A set of high pre-stress girders anchorage cable linkage being convenient to stretch-draw and locking | |
| CN204626421U (en) | A kind of Recyclable anchor rope | |
| CN116220772A (en) | Anti-drop anchor constant-resistance yielding anchor rod device and application method thereof | |
| CN210066742U (en) | Sleeve bead type detachable anchorage device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |