CN110258329B - FRP inhaul cable anchoring device and installation method thereof - Google Patents
FRP inhaul cable anchoring device and installation method thereof Download PDFInfo
- Publication number
- CN110258329B CN110258329B CN201910512548.7A CN201910512548A CN110258329B CN 110258329 B CN110258329 B CN 110258329B CN 201910512548 A CN201910512548 A CN 201910512548A CN 110258329 B CN110258329 B CN 110258329B
- Authority
- CN
- China
- Prior art keywords
- frp
- sleeve
- anchoring
- segmented
- inhaul cable
- 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.)
- Active
Links
- 238000004873 anchoring Methods 0.000 title claims abstract description 114
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000009434 installation Methods 0.000 title abstract description 10
- 230000000712 assembly Effects 0.000 claims abstract description 41
- 238000000429 assembly Methods 0.000 claims abstract description 41
- 239000011247 coating layer Substances 0.000 claims description 15
- 230000000903 blocking effect Effects 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 10
- 230000005540 biological transmission Effects 0.000 claims description 8
- 238000010008 shearing Methods 0.000 abstract description 12
- 230000004308 accommodation Effects 0.000 abstract 1
- 238000001125 extrusion Methods 0.000 description 5
- 230000004323 axial length Effects 0.000 description 4
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 229920002430 Fibre-reinforced plastic Polymers 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011151 fibre-reinforced plastic Substances 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 230000002040 relaxant effect Effects 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/14—Towers; Anchors ; Connection of cables to bridge parts; Saddle supports
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/16—Suspension cables; Cable clamps for suspension cables ; Pre- or post-stressed cables
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/08—Members specially adapted to be used in prestressed constructions
- E04C5/12—Anchoring devices
- E04C5/122—Anchoring devices the tensile members are anchored by wedge-action
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Piles And Underground Anchors (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses an FRP inhaul cable anchoring device and an installation method thereof, and relates to the technical field of inhaul cable anchoring, wherein the FRP inhaul cable anchoring device comprises an external sleeve and a plurality of groups of anchoring components, and each group of anchoring components comprises: a segmented sleeve; the middle part of the inner anchor cup is provided with a through hole, all the through holes of the inner anchor cup form a round table type through hole for fixing the FRP inhaul cable, one end with larger aperture is a free end, and the other end with smaller aperture is a tensioning end; the inner wall of the segmented sleeve is provided with an annular step, the inner anchor cup is provided with a step surface matched with the annular step, and a containing cavity is formed between the annular step and the step surface; an elastic member disposed in the accommodation chamber; the stiffness of the elastic element near the free end in the two adjacent groups of anchor assemblies is larger than that of the elastic element near the stretching end. The invention can obviously reduce the stress concentration phenomenon of the tensioning end, so that the compressive stress and the shearing stress on the surface of the guy cable in the FRP guy cable anchoring area are distributed more uniformly, and the effective anchoring of the large-tonnage FRP guy cable is realized.
Description
Technical Field
The invention relates to the technical field of inhaul cable anchoring, in particular to an FRP inhaul cable anchoring device and an installation method thereof.
Background
FRP (Fibre Reinforced Polymer/plastics) is a novel composite material formed by drawing and forming and necessary surface treatment, wherein fibers are used as reinforcing materials, resins are used as matrix materials, auxiliary agents are doped, and the composite material is formed. Compared with steel, the FRP has the excellent performances of light weight, high strength, corrosion resistance, good fatigue resistance and the like, so the FRP inhaul cable made of the FRP has good application prospect. However, the FRP cable has a problem of difficulty in anchoring, and thus cannot be widely used, especially for a large tonnage FRP cable.
The existing FRP stay rope anchors have a bonding type anchor, a friction type anchor and a mechanical extrusion type anchor.
The bonding type anchorage device is an integrated structure formed by fixing a inhaul cable through bonding materials such as resin and the like and an external straight sleeve; the anchoring mode is stressed clearly, but as the tension tonnage of the inhaul cable is increased, the required anchoring length is increased, and the longer the length of the anchoring device is, the larger the required space is, so that the economical efficiency is insufficient.
The friction type anchorage device adopts an expansion material as a load transmission medium, the expansion material expands after being solidified between the sleeve and the FRP inhaul cable, and extrusion force is generated on the inner wall of the sleeve, so that friction force between the sleeve and the sleeve is increased, and anchoring is realized. However, the compressive strength of the intumescent material itself is limited and the intumescent material may fail under long term loading, resulting in failure of the anchor.
The mechanical extrusion type anchorage is similar to a steel strand clamping piece type anchorage mode, but the rigidity of the clamping piece to the FRP inhaul cable can generate an abrupt change, and the part with weak transverse strength to the FRP inhaul cable can be bited, so that the anchorage efficiency is reduced, and even the anchorage fails.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide the FRP inhaul cable anchoring device and the installation method thereof, so that the compressive stress and the shearing stress on the surface of the inhaul cable in the FRP inhaul cable anchoring area are distributed more uniformly, and the effective anchoring of the large-tonnage FRP inhaul cable is realized.
In order to achieve the above purpose, the invention adopts the following technical scheme: an FRP cable anchor for anchor FRP cable, it includes outside sleeve and multiunit anchor subassembly, multiunit anchor subassembly along outside sleeve axial parallel arrangement in proper order in outside sleeve, every anchor subassembly of group includes:
the outer surface of the segmented sleeve is attached to the inner surface of the outer sleeve;
the middle part of the inner anchor cup is provided with a through hole, all the through holes of the inner anchor cup form a round table type through hole for fixing the FRP inhaul cable, one end with larger aperture is a free end, and the other end with smaller aperture is a tensioning end; the inner anchor cup is sleeved in the segmented sleeve, an annular step is arranged on the inner wall of the segmented sleeve, a step surface matched with the annular step is arranged on the inner anchor cup, and a containing cavity is formed between the annular step and the step surface;
the elastic piece is arranged in the accommodating cavity, and two ends of the elastic piece are respectively abutted on the segmented sleeve and the inner anchor cup;
adjacent segmented sleeves are attached to each other, and gaps are formed between adjacent inner anchor cups; the stiffness of the elastic element near the free end in the two adjacent groups of anchor assemblies is larger than that of the elastic element near the stretching end.
On the basis of the technical scheme, the end face, close to the free end, of the segmented sleeve and the end face, close to the tensioning end, of the inner anchor cup in each group of anchor assemblies is flush, and a distance is reserved between the end face, close to the tensioning end, of the segmented sleeve and the end face, close to the tensioning end, of the inner anchor cup.
On the basis of the technical scheme, the outer surface of the inner anchor cup is in clearance fit with the inner surface of the segmented sleeve.
On the basis of the technical scheme, one side of the outer sleeve, which is close to the tensioning end, is provided with an annular blocking edge, and the segmented sleeve positioned at the tensioning end is abutted against the annular blocking edge.
On the basis of the technical scheme, the outer surface of the outer sleeve, which is positioned at the free end, is provided with external threads, and locking nuts matched with the external threads are arranged on the outer sleeve.
On the basis of the technical scheme, the surface of the FRP inhaul cable is wrapped by adopting a load transmission medium to form a coating layer, and the outer surface of the coating layer is of a truncated cone structure matched with the truncated cone-shaped through hole.
On the basis of the technical scheme, the inner anchor cup, the segmented sleeve and the outer sleeve are all made of rigid materials.
The invention also provides an installation method based on the FRP inhaul cable anchoring device, which comprises the following steps:
an external sleeve is sleeved at the FRP inhaul cable anchoring end;
a plurality of groups of anchor assemblies are sleeved in parallel in sequence from the tensioning end to the free end along the axial direction of the external sleeve at the anchor end of the FRP inhaul cable;
when each group of anchoring components are installed, the segmented sleeve is sleeved at the FRP inhaul cable anchoring end and penetrates into the outer sleeve until the outer surface of the segmented sleeve is attached to the inner surface of the outer sleeve;
placing an elastic piece on the annular step of the segmented sleeve, sleeving an inner anchor cup at the anchoring end of the FRP inhaul cable, sleeving the inner anchor cup in the segmented sleeve, and abutting the inner anchor cup against the other end of the elastic piece 6;
adjacent segmented sleeves are attached to each other, and gaps are formed between adjacent inner anchor cups; the stiffness of the elastic element near the free end in the two adjacent groups of anchor assemblies is larger than that of the elastic element near the stretching end.
On the basis of the technical scheme, after the FRP inhaul cable anchoring end is sleeved with a plurality of groups of anchoring components, the surface of the FRP inhaul cable anchoring area is wrapped by adopting a load transmission medium to form a coating layer, and the outer surface of the coating layer is of a truncated cone structure matched with the truncated cone type through hole.
On the basis of the technical scheme, the method further comprises the following steps: after the outer sleeve and the multiple groups of anchor assemblies are integrally sleeved on the coating layer, the outer surface of the outer sleeve, which is positioned at the free end 21, is locked by a locking nut, and the outer surface of the outer sleeve, which is positioned at the free end 21, is provided with external threads which are locked and matched with the nut.
Compared with the prior art, the invention has the advantages that:
(1) According to the FRP inhaul cable anchoring device, the multi-section type anchoring components are arranged, the rigidity of the multi-section type anchoring components from the tensioning end to the free end is gradually increased, the stress concentration phenomenon of the tensioning end can be obviously reduced, the maximum compressive stress of the surface of the FRP inhaul cable at the tensioning end is greatly reduced, the compressive stress and the shearing stress of the surface of the FRP inhaul cable at the free end are increased, the distribution of the compressive stress and the shearing stress of the surface of the inhaul cable in an FRP inhaul cable anchoring area is more uniform, and therefore effective anchoring of the large-tonnage FRP inhaul cable is achieved.
(2) According to the FRP inhaul cable anchoring device, the elastic pieces with different rigidities are adopted to support the inner anchor cup and the segmented sleeve, the rigidities of the elastic pieces close to the free end in the two adjacent groups of anchoring assemblies are larger than those of the elastic pieces close to the tensioning end, the gradual increase of the rigidities of the multiple groups of anchoring assemblies from the tensioning end to the free end is achieved, and the rigidity adjustment is simple, convenient and controllable.
(3) According to the FRP inhaul cable anchoring device, the elastic piece is arranged in the accommodating cavity, and the gap is arranged between the adjacent inner anchor cups, so that a certain axial movable space exists in the inner anchor cups; the inner surface of the segmented sleeve is in clearance fit with the outer surface of the inner anchor cup, so that a certain radial movable space exists in the inner anchor cup, and meanwhile, the radial constraint force of the segmented sleeve on the inner anchor cup is reduced; the outer surface of the sectional sleeve is attached to the inner surface of the outer sleeve, so that the movement of the inner anchor cup is limited, and the problem that the anchoring effect of the anchoring device is invalid due to the overlarge movement range of the inner anchor cup is prevented.
Drawings
FIG. 1 is a schematic view of the structure of an FRP stay anchoring device in an embodiment of the present invention;
FIG. 2 is a schematic view of a segmented sleeve according to an embodiment of the present invention;
FIG. 3 is a schematic view of the internal anchor cup according to an embodiment of the present invention;
FIG. 4 is a graph showing the distribution of the compressive stress on the surface of the FRP stay cable in the prior art in an anchoring area;
FIG. 5 is a graph showing the distribution of shear stress on the surface of an FRP stay cable in the prior art in an anchoring zone;
FIG. 6 is a graph showing the distribution of FRP cable surface compressive stress in the anchoring zone for 3 sets of anchor assemblies in accordance with the present invention;
FIG. 7 is a graph showing the distribution of the FRP cable surface shear stress in the anchoring zone when 3 groups of anchoring components are used in the embodiment of the invention;
FIG. 8 is a graph showing the distribution of FRP cable surface compressive stress in the anchoring zone for 6 groups of anchor assemblies in accordance with the embodiment of the present invention;
FIG. 9 is a graph showing the distribution of the FRP cable surface shear stress at the anchor zone in the 6 groups of anchor assemblies according to the embodiment of the present invention.
In the figure: the device comprises a 1-outer sleeve, a 11-annular blocking edge, a 2-round table type through hole, a 21-free end, a 22-tensioning end, a 3-anchoring assembly, a 4-segmented sleeve, a 41-annular step, a 5-inner anchor cup, a 51-step surface and a 6-elastic piece.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Referring to fig. 1, an embodiment of the present invention provides an FRP cable anchoring device for anchoring an FRP cable, which includes an outer sleeve 1 and a plurality of groups of anchor assemblies 3, the plurality of groups of anchor assemblies 3 being sequentially disposed in parallel in an axial direction of the outer sleeve 1 in the outer sleeve 1. In this embodiment, the outer sleeve 1 may be made of a rigid material to provide protection and support for the multiple sets of anchor assemblies 3.
Each set of anchoring assemblies 3 described above comprises a segmented sleeve 4, an inner anchor cup 5 and a resilient member 6. In this embodiment, the inner anchor cup 5 and the segmented sleeve 4 may be made of rigid materials, and the axial length of the inner anchor cup 5 is slightly smaller than the axial length of the segmented sleeve 4. The elastic member 6 may be a disc spring.
The segmented sleeve 4 is sleeved in the outer sleeve 1, and the outer surface of the segmented sleeve 4 is attached to the inner surface of the outer sleeve 1. The inner anchor cup 5 is sleeved in the segmented sleeve 4, through holes are formed in the middle of the inner anchor cup 5 along the central axis, in the multiple groups of anchor assemblies 3, all through holes of the inner anchor cup 5 form a circular truncated cone-shaped through hole 2 for fixing the FRP inhaul cable, one end of the circular truncated cone-shaped through hole 2 with larger aperture is a free end 21, and one end of the circular truncated cone-shaped through hole 2 with smaller aperture is a tensioning end 22. Wherein, the included angle between the slope generating line and the axis of the circular truncated cone type through hole is 5-15 degrees.
Referring to fig. 2 and 3, the inner wall of the segmented sleeve 4 is provided with an annular step 41, the inner anchor cup 5 is provided with a step surface 51 adapted to the annular step 41, and a receiving cavity is formed between the annular step 41 and the step surface 51. The elastic member 6 is disposed in the accommodating cavity, and one end of the elastic member 6 abuts against the annular step 41 of the segmented sleeve 4, and the other end abuts against the step surface 51 opposite to the annular step 41.
In this embodiment, the two ends of the elastic member 6 are respectively provided with an end gasket, and the end gaskets are abutted with the segmented sleeve 4 and the internal anchor cup 5 at the two ends, so as to increase the contact area between the elastic member 6 and the segmented sleeve 4 and the internal anchor cup 5, and improve the stress distribution.
In the embodiment, the surface of the FRP inhaul cable is wrapped by a load transmission medium to form a coating layer, and the outer surface of the coating layer is of a truncated cone structure matched with the truncated cone type through hole. Through this coating of FRP cable anchor district cladding, can play the guard action to anchor district cable on the one hand, on the other hand is convenient for multiunit anchor subassembly 3 anchor it.
In the embodiment, a round table-shaped expansion end is formed by adopting the coating layer and the FRP inhaul cable, and then the whole extrusion anchoring of the anchoring area is realized by the multi-group anchoring assembly 3 with the round table-shaped through holes. The elastic modulus of the multiple groups of anchoring components 3 is very important to select, and if the selected elastic modulus is too small, the larger slippage of the inhaul cable can be caused, so that the anchoring failure is caused; if the elastic modulus is too large, concentrated stress can be formed at the tensioning end, so that the local extrusion damage of the inhaul cable is caused, and the anchoring failure is caused.
When the common anchoring assembly is used for FRP inhaul cable anchoring, the phenomenon of delayed transmission of load and longitudinal deformation exists in the inhaul cable anchoring area from the tensioning end 22 to the free end 21, and the problem of stress concentration is generated at the tensioning end 22, so that the transverse compressive stress and the shearing stress on the surface of the inhaul cable in the anchoring area are unevenly distributed, and the longer the length of the anchoring area is, the more serious the problem is. The longitudinal direction is the stress direction along the axial direction of the FRP inhaul cable, and the transverse direction is the direction vertical to the axial direction of the FRP inhaul cable. Accordingly, the difference between the transverse performance and the longitudinal performance of the FRP cable is large, and stress concentration causes damage to the cable due to the fact that the stress at the tension end 22 exceeds the limit prematurely, and at this time, the stress at the cable free end 21 is very small, and the contribution to anchoring is not exerted much.
Compared with the existing anchoring device, in the two adjacent groups of anchoring assemblies 3 of the embodiment, the adjacent segmented sleeves 4 are attached to each other, and gaps are formed between the adjacent inner anchor cups 5, so that the inner anchor cups 5 can have a certain movable space and can be limited in movement, and the overlarge movable range of the inner anchor cups 5 is prevented, so that the anchoring effect of the anchoring device is invalid. Wherein the gap between adjacent inner anchor cups 5 is 0.1-5mm.
At the same time, in the adjacent two groups of anchor assemblies 3, the stiffness of the elastic member 6 near the free end 21 is greater than the stiffness of the elastic member 6 near the tensioning end 22. The elastic pieces 6 with different rigidities are adopted to support the inner anchor cup 5 and the segmented sleeve 4, the rigidities of the elastic pieces 6 are gradually increased from the tensioning end 22 to the free end 21, the rigidity increment of the multiple groups of anchor assemblies 3 from the tensioning end 22 to the free end 21 can be realized, and the rigidity adjustment is simple, convenient and controllable.
When the FRP cable is anchored in the anchoring device of the present embodiment, the circular truncated cone-shaped through hole 2 is internally covered with the anchoring region of the FRP cable. Through multistage formula anchor subassembly 3, and multiunit anchor subassembly 3 increases gradually from stretch-draw end 22 to the rigidity of free end 21, when the FRP cable is taut, relax stretch-draw end 22 cable's deformation restriction, and be the form of relaxing gradually from free end 21 to stretch-draw end 22, with the stress concentration phenomenon that reduces stretch-draw end 22, reduce the biggest compressive stress on stretch-draw end 22FRP cable surface, increase compressive stress and the shear stress on free end 21 cable surface, make the compressive stress and the shear stress distribution on FRP cable anchor area internal tension cable surface more even, realize the effective anchor of large-tonnage FRP cable.
In this embodiment, the end surfaces of the segmented sleeves 4 near the tensioning ends 22 and the end surfaces of the inner anchor cups 5 near the tensioning ends 22 of each group of anchor assemblies 3 are flush with the end surfaces of the inner anchor cups 5 near the free ends 21, so that gaps are left between adjacent inner anchor cups 5.
In other embodiments, each set of anchoring assemblies 3 may also have the segmented sleeve 4 flush with the end face of the inner anchor cup 5 adjacent the tensioning end 22, with a distance being left between the end face of the segmented sleeve 4 adjacent the free end 21 and the end face of the inner anchor cup 5 adjacent the free end 21.
Preferably, the outer surface of the inner anchor cup 5 is in a clearance fit with the inner surface of the segmented sleeve 4, such that there is some radial play of the inner anchor cup 5.
In this embodiment, an annular blocking edge 11 is disposed on a side of the outer sleeve 1 near the tensioning end 22, and the segmented sleeve 4 located at the tensioning end 22 abuts against the annular blocking edge 11, so that the segmented sleeve 4 is limited by the annular blocking edge 11.
In this embodiment, the outer surface of the outer sleeve 1 at the free end 21 is further provided with an external thread, on which a locking nut is mounted, which matches the external thread. The stretching load of the FRP inhaul cable can be transmitted to a base or other connecting structures connected with the FRP inhaul cable through the lock nut.
When the traditional anchoring device is used for anchoring the FRP inhaul cable, the distribution curves of the surface compressive stress and the shearing stress of the FRP inhaul cable in an anchoring area are shown in fig. 4 and 5 from the stretching end to the free end, and the maximum compressive stress of the stretching end of the surface of the FRP inhaul cable is 134MPa.
In this embodiment, the anchor assemblies 3 may be set in multiple groups according to actual situations, and the rigidity of the elastic member 6 is also set according to actual requirements.
Referring to fig. 6 and 7, when the anchor assembly 3 is provided with 3 groups, from the tensioning end 22 to the free end 21, the stiffness (N/mm) of the elastic members are respectively: 4E4 (i.e. 4X 10) 4 ) 4E5 (i.e. 4X 10) 5 ) 3E7 (i.e. 3X 10) 7 ). The anchoring device of the embodiment reduces the maximum compressive stress of the stretching end of the surface of the FRP inhaul cable from 134MPa to 79MPa, obviously reduces the stress, and has some compressive stress and shearing stress at the free endBut the overall distribution variation is not uniform enough.
Referring to fig. 8 and 9, when the anchor assembly 3 is provided with 6 groups, from the tensioning end 22 to the free end 21, the stiffness (N/mm) of the elastic members are respectively: 3E4 (i.e. 3X 10) 4 ) 6E4 (i.e. 6X 10) 4 ) 1.2E5 (i.e. 1.25X10) 5 ) 3E5 (i.e. 3X 10) 5 ) 2E6 (i.e. 2X 10) 6 ) 3E7 (i.e. 3X 10) 7 ). The anchoring device of the embodiment enables the maximum compressive stress of the stretching end of the surface of the FRP inhaul cable to be reduced from 134MPa to 74MPa, the stress is obviously reduced, the compressive stress and the shearing stress of the free end are both improved, meanwhile, the overall distribution of the transverse compressive stress and the shearing stress of the surface of the inhaul cable in the anchoring area is more uniform, and the contribution of the free end to the anchoring device is improved.
As can be seen from fig. 4 to 9, when the anchoring device of the embodiment is adopted for anchoring the stay cable, one end of the FRP stay cable adjacent to the tensioning end 22 is a stress end, and in the process of tensioning the FRP stay cable, the stress end 22 receives axial tension to drive the FRP stay cable to axially displace, as a gap is arranged between adjacent inner anchor cups 5, adjacent segmented sleeves 4 are attached, and the outer surfaces of the inner anchor cups 5 are in clearance fit with the inner surfaces of the segmented sleeves 4, so that a certain movable space exists for the inner anchor cups 4, the radial constraint force of the segmented sleeves 4 on the inner anchor cups 5 is reduced, and the compressive stress is reduced accordingly; simultaneously, the rigidity of the multiple groups of anchoring assemblies 3 from the tensioning end 22 to the free end 21 is gradually increased, so that the compressive stress and the shearing stress of the surface of the inhaul cable of the free end 21 are increased, and the compressive stress and the shearing stress of the surface of the inhaul cable in the anchoring area are distributed more uniformly.
The embodiment of the invention also provides an installation method of the FRP inhaul cable anchoring device, which comprises the following steps:
s1, sleeving an external sleeve 1 at an FRP inhaul cable anchoring end; wherein an annular blocking edge 11 is arranged on one side of the outer sleeve 1.
S2, sequentially sleeving a plurality of groups of anchor assemblies 3 in parallel from the tensioning end 22 to the free end 21 along the axial direction of the outer sleeve 1 at the anchor end of the FRP inhaul cable. Wherein each set of anchor assemblies 3 comprises a segmented sleeve 4, an inner anchor cup 5 and a resilient member 6.
When each group of anchoring assemblies 3 are installed, the segmented sleeve 4 is sleeved at the FRP inhaul cable anchoring end and penetrates through the outer sleeve 1 until the outer surface of the segmented sleeve 4 is attached to the inner surface of the outer sleeve 1.
Then, the elastic piece 6 is placed on the annular step 41 of the segmented sleeve 4, the inner anchor cup 5 is sleeved at the anchoring end of the FRP inhaul cable and is sleeved inside the segmented sleeve 4, and the inner anchor cup 5 abuts against the other end of the elastic piece 6, so that the installation of a group of anchoring assemblies 3 is completed. Additional anchor assemblies 3 continue to be installed on the set of anchor assemblies 3 until installation of all anchor assemblies 3 is completed. In this embodiment, the stiffness of the elastic member 6 near the free end 21 is greater than the stiffness of the elastic member 6 near the tensioning end 22 in the adjacent two sets of anchor assemblies 3.
When the first group of anchor assemblies 3 are installed, the segmented sleeve 4 is penetrated inside the outer sleeve 1, and the end surface of the segmented sleeve needs to be abutted against the annular blocking edge 11 of the outer sleeve 1, so that the segmented sleeve 4 is attached and fixed with the previous segmented sleeve 4 when the subsequent segmented sleeve 4 is installed. Thus, in adjacent two sets of anchor assemblies 3, adjacent segmented sleeves 4 are in abutment.
The axial length of the inner anchor cups 5 is slightly smaller than the axial length of the segmented sleeve 4, so that a gap is provided between adjacent inner anchor cups 5. In this embodiment, the segmented sleeve 4 of each set of anchoring assemblies 3 is flush with the end face of the inner anchor cup 5 adjacent to the free end 21, and a distance is left between the end face of the segmented sleeve 4 adjacent to the tensioning end 22 and the end face of the inner anchor cup 5 adjacent to the tensioning end 22.
After the step S2, namely, after the FRP inhaul cable anchoring end is sleeved with a plurality of groups of anchoring assemblies 3, the surface of the FRP inhaul cable anchoring area is wrapped by adopting a load transmission medium to form a coating layer, and the outer surface of the coating layer is of a truncated cone structure matched with the truncated cone type through hole. The load transfer medium may be glass fiber pre-impregnated with resin, or other load-transferring materials may be used.
The FRP inhaul cable end part covered by the covering layer is an inhaul cable anchoring area, the assembled outer sleeve 1 and the multiple groups of anchoring assemblies 3 are integrally moved and sleeved on the covering layer, the outer surface of the outer sleeve 1, which is positioned at the free end 21, is locked by a locking nut, and the outer surface of the outer sleeve 1, which is positioned at the free end 21, is provided with external threads which are locked and matched with the nut. Then, other externally anchored connection structures can be connected. The stretching load of the FRP inhaul cable can be transmitted to a base or other connecting structures connected with the FRP inhaul cable through the lock nut.
The installation method of the embodiment is suitable for the anchoring device, is simple, is convenient to operate, can obviously reduce the stress concentration phenomenon of the tensioning end, ensures that the compressive stress and the shearing stress of the surface of the tensioning rope in the FRP rope anchoring area are distributed more uniformly, and realizes the effective anchoring of the large-tonnage FRP rope.
The invention is not limited to the embodiments described above, but a number of modifications and adaptations can be made by a person skilled in the art without departing from the principle of the invention, which modifications and adaptations are also considered to be within the scope of the invention. What is not described in detail in this specification is prior art known to those skilled in the art.
Claims (10)
1. An FRP cable anchoring device for anchor FRP cable, its characterized in that, it includes outside sleeve (1) and multiunit anchor subassembly (3), multiunit anchor subassembly (3) follow outside sleeve (1) axial in proper order parallel set up in outside sleeve (1), every anchor subassembly (3) of group include:
the outer surface of the segmented sleeve (4) is attached to the inner surface of the outer sleeve (1);
the middle part of the inner anchor cup (5) is provided with a through hole, all the through holes of the inner anchor cup (5) form a round table type through hole (2) for fixing the FRP inhaul cable, one end with larger aperture is a free end (21), and the other end with smaller aperture is a tensioning end (22); the inner anchor cup (5) is sleeved in the segmented sleeve (4), an annular step (41) is arranged on the inner wall of the segmented sleeve (4), a step surface (51) matched with the annular step (41) is arranged on the inner anchor cup (5), and a containing cavity is formed between the annular step (41) and the step surface (51);
the elastic piece (6) is arranged in the accommodating cavity, and two ends of the elastic piece (6) are respectively abutted against the segmented sleeve (4) and the inner anchor cup (5);
adjacent segmented sleeves (4) are attached to each other, and gaps are formed between adjacent inner anchor cups (5); the stiffness of the elastic elements (6) of the adjacent two groups of anchoring assemblies (3) near the free end (21) is greater than the stiffness of the elastic elements (6) near the tensioning end (22).
2. The FRP cable anchoring device according to claim 1, wherein: the end faces of the segmented sleeves (4) close to the tensioning ends (22) and the end faces of the inner anchor cups (5) close to the tensioning ends (22) are kept at a distance.
3. The FRP cable anchoring device according to claim 1, wherein: the outer surface of the inner anchor cup (5) is in clearance fit with the inner surface of the segmented sleeve (4).
4. The FRP cable anchoring device according to claim 1, wherein: an annular blocking edge (11) is arranged on one side, close to the tensioning end (22), of the outer sleeve (1), and the segmented sleeve (4) located at the tensioning end (22) abuts against the annular blocking edge (11).
5. The FRP cable anchoring device according to claim 1, wherein: the outer surface of the outer sleeve (1) positioned at the free end (21) is provided with external threads, and a locking nut matched with the external threads is arranged on the outer sleeve.
6. The FRP cable anchoring device according to claim 1, wherein: the FRP inhaul cable surface is wrapped by a load transmission medium to form a coating layer, and the outer surface of the coating layer is of a truncated cone structure matched with the truncated cone type through hole.
7. The FRP cable anchoring device according to claim 1, wherein: the inner anchor cup (5), the segmented sleeve (4) and the outer sleeve (1) are all made of rigid materials.
8. A method for installing an FRP cable anchoring device according to claim 1, characterized by comprising the steps of:
an external sleeve (1) is sleeved at the FRP inhaul cable anchoring end;
a plurality of groups of anchor assemblies (3) are sleeved in parallel in sequence from a tensioning end (22) to a free end (21) along the axial direction of the outer sleeve (1) at the anchor end of the FRP inhaul cable;
when each group of anchoring assemblies (3) is installed, the segmented sleeve (4) is sleeved at the FRP inhaul cable anchoring end and is penetrated into the outer sleeve (1) until the outer surface of the segmented sleeve (4) is attached to the inner surface of the outer sleeve (1);
placing an elastic piece (6) on the annular step (41) of the segmented sleeve (4), sleeving an inner anchor cup (5) at the anchoring end of the FRP inhaul cable, sleeving the inner anchor cup in the segmented sleeve (4), and abutting the inner anchor cup (5) against the other end of the elastic piece (6);
adjacent segmented sleeves (4) are attached to each other, and gaps are formed between adjacent inner anchor cups (5); the stiffness of the elastic elements (6) of the adjacent two groups of anchoring assemblies (3) near the free end (21) is greater than the stiffness of the elastic elements (6) near the tensioning end (22).
9. The method of installing an FRP cable anchoring device of claim 8, characterized in that: after the FRP inhaul cable anchoring end is sleeved with a plurality of groups of anchoring components (3), the surface of the FRP inhaul cable anchoring area is wrapped by a load transmission medium to form a coating layer, and the outer surface of the coating layer is of a truncated cone structure matched with the truncated cone type through hole.
10. The method of installing an FRP cable anchoring device according to claim 9, further comprising: after the outer sleeve (1) and the multiple groups of anchoring assemblies (3) are integrally sleeved on the coating layer, the outer surface of the outer sleeve (1) positioned at the free end (21) is locked by a locking nut, and the outer surface of the outer sleeve (1) positioned at the free end (21) is provided with external threads which are locked and matched with the nut.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910512548.7A CN110258329B (en) | 2019-06-13 | 2019-06-13 | FRP inhaul cable anchoring device and installation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910512548.7A CN110258329B (en) | 2019-06-13 | 2019-06-13 | FRP inhaul cable anchoring device and installation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110258329A CN110258329A (en) | 2019-09-20 |
| CN110258329B true CN110258329B (en) | 2024-02-27 |
Family
ID=67918240
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910512548.7A Active CN110258329B (en) | 2019-06-13 | 2019-06-13 | FRP inhaul cable anchoring device and installation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110258329B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110725547B (en) * | 2019-10-17 | 2023-08-11 | 柳州欧维姆机械股份有限公司 | Compact steel strand inhaul cable and manufacturing method thereof |
| CN113309296A (en) * | 2021-06-21 | 2021-08-27 | 马献林 | Fiber composite material inhaul cable elastic anchorage device |
| CN116227002B (en) * | 2023-03-31 | 2024-06-25 | 安徽省交通控股集团有限公司 | Protection method for homodromous rotary inhaul cable |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2106950A (en) * | 1981-09-30 | 1983-04-20 | Dyckerhoff & Widmann Ag | Improvements in or relating to stressed tension members |
| JPH0254049A (en) * | 1988-08-15 | 1990-02-23 | Kumagai Gumi Co Ltd | Anchoring method and anchorage of fiber reinforced resin tension member |
| EP0554161A1 (en) * | 1992-01-31 | 1993-08-04 | Sondages Injections Forages "S.I.F." Entreprise Bachy | Anchorage device for a bundle of fibre filaments |
| WO2002057560A1 (en) * | 2000-12-22 | 2002-07-25 | Deep Water Composites As | End termination of tension leg |
| KR20090041016A (en) * | 2007-10-23 | 2009-04-28 | 한국건설기술연구원 | Multi con type anchorage apparatus for frp tendon |
| CN104963286A (en) * | 2015-07-07 | 2015-10-07 | 中铁大桥局集团有限公司 | FRP inhaul cable anchoring device with ferrule releasing function, and mounting method of FRP inhaul cable anchoring device |
| DE102015200274A1 (en) * | 2015-01-12 | 2016-07-14 | Universität Stuttgart | Anchoring device for tension members and method for adjusting and optionally controlling such an anchoring device |
| CN108004926A (en) * | 2017-11-30 | 2018-05-08 | 东南大学 | Large-tonnage FRP inhaul cable anchoring process |
| CN210658000U (en) * | 2019-06-13 | 2020-06-02 | 中铁大桥科学研究院有限公司 | FRP inhaul cable anchoring device |
-
2019
- 2019-06-13 CN CN201910512548.7A patent/CN110258329B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2106950A (en) * | 1981-09-30 | 1983-04-20 | Dyckerhoff & Widmann Ag | Improvements in or relating to stressed tension members |
| JPH0254049A (en) * | 1988-08-15 | 1990-02-23 | Kumagai Gumi Co Ltd | Anchoring method and anchorage of fiber reinforced resin tension member |
| EP0554161A1 (en) * | 1992-01-31 | 1993-08-04 | Sondages Injections Forages "S.I.F." Entreprise Bachy | Anchorage device for a bundle of fibre filaments |
| WO2002057560A1 (en) * | 2000-12-22 | 2002-07-25 | Deep Water Composites As | End termination of tension leg |
| KR20090041016A (en) * | 2007-10-23 | 2009-04-28 | 한국건설기술연구원 | Multi con type anchorage apparatus for frp tendon |
| DE102015200274A1 (en) * | 2015-01-12 | 2016-07-14 | Universität Stuttgart | Anchoring device for tension members and method for adjusting and optionally controlling such an anchoring device |
| CN104963286A (en) * | 2015-07-07 | 2015-10-07 | 中铁大桥局集团有限公司 | FRP inhaul cable anchoring device with ferrule releasing function, and mounting method of FRP inhaul cable anchoring device |
| CN108004926A (en) * | 2017-11-30 | 2018-05-08 | 东南大学 | Large-tonnage FRP inhaul cable anchoring process |
| CN210658000U (en) * | 2019-06-13 | 2020-06-02 | 中铁大桥科学研究院有限公司 | FRP inhaul cable anchoring device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110258329A (en) | 2019-09-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110258329B (en) | FRP inhaul cable anchoring device and installation method thereof | |
| US20120141198A1 (en) | End anchoring structure and method for fiber-reinforced plastic filament body | |
| US8777162B2 (en) | Connecting rod for the structural reinforcement of a fuselage structure of an aircraft | |
| CA2394969C (en) | Butt joint for hollow profiles | |
| KR100471337B1 (en) | Synthetic non-metallic rope for an elevator | |
| US10612568B2 (en) | Connector | |
| AU606814B2 (en) | Screw fixing device for a concrete construction element | |
| JPH02147749A (en) | Fixing device for cylindrical tension member composed of fiber composite material | |
| BR102018005519A2 (en) | end connection, composite structural member, and method for forming an end connection | |
| AU2004243414B2 (en) | Rotor blade connection | |
| US4442646A (en) | Device for anchoring tensioning elements | |
| CA2683412A1 (en) | Force transmitting assembly for a fiber composite tie rod | |
| CN102002911A (en) | Carbon fiber cable strand inner sleeve conical bonded anchorage device | |
| US4954377A (en) | Load bearing connective damper | |
| US4127741A (en) | Arrangement for elastically clamping glass fibre rods | |
| CN210658000U (en) | FRP inhaul cable anchoring device | |
| GB2054083A (en) | A Tensile/Compressive Member | |
| US6131850A (en) | Adjustable length brace for cyclic loads | |
| KR20060125617A (en) | Support means with mechanically positive connection for connecting several cables | |
| US4065903A (en) | Fixation and/or support means | |
| KR101139393B1 (en) | Anchorage apparatus for frp cable and construction method using the same | |
| US6965184B2 (en) | Apparatus for supporting a stator end winding | |
| KR100951405B1 (en) | Multi con type anchorage apparatus for frp tendon | |
| US20200040593A1 (en) | A reinforcement system and a method of reinforcing a structure with a tendon | |
| US20020031399A1 (en) | Termination of tension member |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |