CN110258299B - Tapered anti-slip key anchoring steel strand inhaul cable with fork lugs and construction method thereof - Google Patents
Tapered anti-slip key anchoring steel strand inhaul cable with fork lugs and construction method thereof Download PDFInfo
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- CN110258299B CN110258299B CN201910580165.3A CN201910580165A CN110258299B CN 110258299 B CN110258299 B CN 110258299B CN 201910580165 A CN201910580165 A CN 201910580165A CN 110258299 B CN110258299 B CN 110258299B
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- slip key
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 208
- 239000010959 steel Substances 0.000 title claims abstract description 208
- 238000004873 anchoring Methods 0.000 title claims abstract description 69
- 238000010276 construction Methods 0.000 title claims abstract description 28
- 238000007789 sealing Methods 0.000 claims abstract description 120
- 238000000034 method Methods 0.000 claims abstract description 13
- 229920001903 high density polyethylene Polymers 0.000 claims description 81
- 239000004700 high-density polyethylene Substances 0.000 claims description 81
- 238000005260 corrosion Methods 0.000 claims description 48
- 239000003292 glue Substances 0.000 claims description 33
- 239000000463 material Substances 0.000 claims description 31
- 230000001681 protective effect Effects 0.000 claims description 31
- 239000003566 sealing material Substances 0.000 claims description 28
- 239000004698 Polyethylene Substances 0.000 claims description 23
- 230000000149 penetrating effect Effects 0.000 claims description 20
- 238000003825 pressing Methods 0.000 claims description 16
- 238000005536 corrosion prevention Methods 0.000 claims description 14
- 229920001296 polysiloxane Polymers 0.000 claims description 11
- 239000005077 polysulfide Substances 0.000 claims description 11
- 229920001021 polysulfide Polymers 0.000 claims description 11
- 150000008117 polysulfides Polymers 0.000 claims description 11
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims description 9
- 239000003063 flame retardant Substances 0.000 claims description 9
- 239000004519 grease Substances 0.000 claims description 9
- 210000005069 ears Anatomy 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 7
- 238000011049 filling Methods 0.000 claims description 7
- 238000003466 welding Methods 0.000 claims description 6
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 230000005284 excitation Effects 0.000 abstract description 5
- 230000035939 shock Effects 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 description 11
- 238000001125 extrusion Methods 0.000 description 8
- 239000004593 Epoxy Substances 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 5
- 239000004570 mortar (masonry) Substances 0.000 description 5
- 230000002421 anti-septic effect Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000000565 sealant Substances 0.000 description 2
- 230000002929 anti-fatigue Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001192 hot extrusion Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000725 suspension Substances 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
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Piles And Underground Anchors (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
A conical anti-slip key anchoring steel strand inhaul cable with fork lugs and a construction method thereof relate to a steel strand inhaul cable and a construction method thereof, wherein a fixed end anchorage of the inhaul cable comprises fork lugs, a conical anti-slip key anchoring anchorage, the conical anti-slip key anchoring anchorage comprises a conical anti-slip key, an anchor plate and a sealing cylinder, the conical anti-slip key is a round sleeve with one end provided with a conical outer surface, and the conical outer surface of the round sleeve is embedded in a conical hole of the anchor plate; the method comprises the steps of enabling a steel strand to penetrate through a conical anti-slip key to anchor an anchor device, and extruding the conical anti-slip key to enable the conical outer surface of the conical anti-slip key to be embedded into a conical hole of an anchor plate; pinning a fixed end anchor with a fork ear to an ear plate at the tower end; and the other end of the traction steel strand passes through the tension end anchorage device, the single tension steel strand is anchored after the cable force is calculated, and the clamping piece is pressed after all the steel strands are tensioned. The invention has the characteristics of reliable anchoring, reduced size of the anchor, reduced production cost, reduced wind resistance coefficient of the inhaul cable, improved wind and rain shock excitation resistance and the like, and is easy to popularize and apply.
Description
Technical Field
The utility model relates to a steel strand inhaul cable and a construction method thereof, in particular to an anchor steel strand inhaul cable with a fork lug cone type anti-slip key and a construction method thereof.
Background
The fork ear type inhaul cable is mainly a cold cast anchor, a hot cast anchor steel wire inhaul cable and a whole bundle of extruded steel strand inhaul cable at present, and the two inhaul cables belong to finished product cables and have the following defects: (1) The manufacturing process is complex and tedious, and the precision requirement on the blanking length is high. (2) The outer sheath generates internal stress during hot extrusion molding, the inhaul cable also generates internal stress due to stretching in the stretching process, and the HDPE sheath is also influenced by illumination, temperature change and alternating load in the using process of the inhaul cable, and the factors can lead to stress cracking of the HDPE sheath. (3) In the transportation and construction process, the outer protective sleeve of the inhaul cable is also easy to be damaged, so that the corrosion resistance of the inhaul cable is reduced. (4) Meanwhile, the whole finished rope is transported by a large transport tool and large hoisting and traction equipment, and the rope hanging is difficult.
The utility model patent with the publication number of CN202450444U discloses a fork ear type steel strand inhaul cable anchorage device, which comprises a squeezing anchorage cup connected with a fork ear, a squeezing anchorage plate provided with a through hole, a sealing anchorage cylinder, a telescopic cylinder and other parts, and the utility model avoids a series of problems caused by adopting a finished cable, but the utility model still has the following disadvantages: (1) the extrusion sleeve with a cylindrical structure is adopted, the extrusion sleeve is extruded at the end part of the steel strand, the end surface of the extrusion sleeve is in plane contact with the end surface of the extrusion anchor plate, the bearing area is small, and the anchoring of the steel strand is not reliable enough; if the bearing area is required to be increased, the outer diameter of the extrusion sleeve is required to be increased, so that the hole spacing of the anchor plate is increased, and the size of the whole anchor is increased, thereby increasing the materials and the cost; and the outer diameter of the inhaul cable is increased, so that the windage resistance coefficient of the inhaul cable is increased, and the wind and rain shock excitation resistance of the inhaul cable is reduced. (2) The construction period of pouring the epoxy mortar is long when the extrusion sleeve is assembled on the whole bridge deck, the whole anchor is required to be put into a curing furnace for curing for more than half a day after the epoxy mortar is poured, the suspension cable is required to be pulled after the epoxy mortar is completely cured, and the construction period is long. (3) The external threads of the fork lugs are screwed into the extrusion anchor cup, and the sealing waterproof performance of the contact end surfaces of the fork lugs and the extrusion anchor cup is poor.
Disclosure of Invention
The invention aims to solve the technical problems that: the tapered anti-slip key anchoring steel strand inhaul cable with the fork lugs and the construction method thereof are provided, so that the problems of a series of problems caused by adopting finished ropes can be solved, and the defects of high production cost, large inhaul cable wind resistance coefficient and low wind and rain excitation resistance of an anchorage device can be solved.
The technical scheme for solving the technical problems is as follows: the tapered anti-slip key anchoring steel strand inhaul cable with the fork lugs comprises a fixed end anchorage with the fork lugs, an inhaul cable body and a tensioning end anchorage, wherein the inhaul cable body is a steel strand bundle consisting of a plurality of parallel unbonded prestressed steel strands; the fixed end anchorage with the fork lugs comprises fork lugs and cone-shaped anti-slip key anchorage devices; the conical anti-slip key anchoring anchorage comprises a conical anti-slip key, an anchor plate and a sealing cylinder, wherein the conical anti-slip key is a round sleeve with one end provided with a conical outer surface, the conical anti-slip key is extruded at the end part of each steel strand, and the conical outer surface of the conical anti-slip key is embedded in a conical hole of the anchor plate; the anchor plate is connected with the fork lugs, the anchor plate is also connected with one end of the sealing cylinder, a sealing device is arranged in a hole at the other end of the sealing cylinder, and an anti-corrosion material is poured into the sealing cylinder.
The invention further adopts the technical scheme that: an anti-skid key limiting device is further connected to one side of the taper hole end of the anchor plate; the cone-shaped anti-slip key anchoring anchorage device also comprises a pull rod, one end of the pull rod penetrates through the sealing device to be connected with the anchor plate, and the other end of the pull rod is sleeved with a nut for compressing the sealing device.
The invention further adopts the technical scheme that: the side wall of the fork lug connected with the anchor plate is also provided with a set screw for positioning and locking, and the tip of the set screw is propped against the outer circle surface of the anchor plate; a layer of sealing material A is coated on the outer circumferential surface of the anchor plate connected with the fork lugs, and the sealing material A is thread sealing glue or silicone sealing glue or polysulfide sealing glue.
The invention further adopts the technical scheme that: the sealing cylinder is provided with a pouring hole A, the fork lug is provided with a pouring hole B, and the anchor plate is provided with a pouring hole C; or the anchor plate is provided with a symmetrical pouring hole C and a symmetrical pouring hole D, the end face of the taper hole end of the anchor plate is provided with an annular groove, a sealing material B is placed in the annular groove, and a protective cover is pressed on the sealing material B; the sealing material B is sealing putty, a water-swelling rubber sealing strip, silicone sealing glue, polysulfide sealing glue or thread sealing glue; the anti-corrosion material is oily wax or anti-corrosion grease or water-swelling flame-retardant anti-rust non-drying sealing paste.
The invention further adopts the technical scheme that: the unbonded steel strand is a PE sheath steel strand; the outer HDPE sheath pipe is sleeved outside the guy rope body, one end of the HDPE outer sheath pipe is connected with the waterproof cover, the other end of the HDPE outer sheath pipe is sleeved with the HDPE telescopic device, and the HDPE telescopic device is connected to the end part of the fork lug.
The other technical scheme of the invention is as follows: the construction method of the conical anti-slip key anchoring steel strand inhaul cable with fork ears comprises the steps of firstly fixing a tensioning end anchor on a bearing embedded part with a beam end pre-buried, then enabling a steel strand to pass through an HDPE outer protective sleeve and the conical anti-slip key anchoring anchor, extruding the conical anti-slip key at one end part of the steel strand, and enabling the conical outer surface of the conical anti-slip key to be embedded into a conical hole of an anchor plate; the fork lugs are connected with the cone-shaped anti-slip key anchoring anchors to form fixed end anchors with fork lugs, and the fixed end anchors with fork lugs are pinned on the lug plates at the tower ends; and (3) pulling the other end of the steel strand to pass through an anchor at the tensioning end, tensioning the steel strand by a single tensioning jack until the cable force is calculated, then anchoring the steel strand, and carrying out clamping piece jacking after all the steel strands are installed and tensioned.
The invention further adopts the technical scheme that: the method comprises the following steps:
A. Preparation work
A1. Welding an HDPE outer sheath pipe;
A2. blanking a steel strand;
B. cable assembly
B1. Connecting one end of the welded HDPE outer protective sleeve with a waterproof cover, and sleeving the tower end HDPE telescopic device outside the other end of the HDPE outer protective sleeve;
B2. placing a wire dividing plate for layered positioning of the steel strands, and ensuring that hole positions of the wire dividing plate correspond to anchor hole positions one by one;
B3. threading steel strands and extruding anti-slip keys: the steel strand passes through the conical anti-slip key to anchor the anchor device, and the conical anti-slip key is extruded at the end part of the fixed end of the steel strand, so that the conical outer surface of the conical anti-slip key is embedded in the conical hole of the anchor plate;
B4. the fork lugs are connected with an anchor plate of the cone anti-slip key anchoring anchor to form a fixed end anchor with the fork lugs, the fork lugs are screwed in place and then are provided with set screws, and a layer of sealing material A is coated on the outer circumferential surface of the anchor plate connected with the fork lugs;
B5. the HDPE outer protective sleeve, the HDPE telescopic device and the fixed end anchor with the fork lugs are firmly fixed, and a hoisting rope is arranged;
B6. hoisting the stay rope to the vicinity of the lug plate of the corresponding cable number at the tower end through the hoisting rope, pulling the stay rope to be in place, connecting the fork lugs of the stay rope with the lug plate at the tower end at the fixed end, and locking the pin shaft;
B7. sequentially taking out the steel strands from the wire dividing plate, connecting the steel strands with connectors of traction ropes extending out of the stretching end anchors, penetrating the steel strands through the stretching end anchors, stretching the steel strands to the calculated rope force by using a stretching jack single stretching the steel strands, and anchoring the steel strands until all the steel strands are installed and stretched;
B8. And (3) jacking and pressing the clamping piece: and jacking the clamping piece of the tension end anchorage device.
The invention further adopts the technical scheme that: step B3, threading the steel strand and extruding the anti-skid key, or threading the steel strand first and extruding the anti-skid key:
when the design size of the anchor plate hole is larger than the diameter of the steel strand but smaller than the overall diameter of the PE sheath steel strand, one end of the fixed end of the steel strand passes through the wire separating plate and is connected with the rope penetrating device, then the waterproof cover and the HDPE outer sheath pipe are sequentially penetrated, the steel strand is taken down, passes through the corresponding hole of the conical anti-sliding key anchoring anchor, then the anti-sliding key is extruded, the steel strand is pulled back until the conical outer surface of the conical anti-sliding key is embedded into the conical hole of the anchor plate, and after all the steel strands are penetrated, the anti-sliding key limiting device is installed;
step B3, threading the steel strand and extruding an anti-skid key or extruding the anti-skid key first and then threading the steel strand:
when the design size of the anchor plate hole is larger than the overall diameter of the PE sheath steel strand, firstly extruding the cone-shaped anti-slip key, penetrating through the anchor plate end face of the cone-shaped anti-slip key anchoring anchor, connecting with the steel strand traction device through the cone-shaped anti-slip key anchoring anchor, and sequentially penetrating through the HDPE outer sheath pipe, the waterproof cover and the corresponding hole of the wire dividing plate until the cone-shaped outer surface of the cone-shaped anti-slip key is embedded in the cone hole of the anchor plate; and after all the steel strands pass through, installing an anti-skid key limiting device.
The invention further adopts the technical scheme that: b4-1 is also included between the step B4 and the step B5, and the fixed end anchor with the fork lugs is subjected to corrosion prevention treatment:
pouring the anti-corrosion material from the pouring hole A of the sealing cylinder to the pouring hole B on the fork lug, wherein the anti-corrosion material overflows to stop pouring, and installing plugs on the pouring hole A and the pouring hole B;
step B9 is included after step B8:
(1) carrying out anti-corrosion treatment on the anchor at the tensioning end;
(2) and carrying out corrosion prevention treatment on the inhaul cable exposed metal piece.
The invention further adopts the technical scheme that: b3-1 is also included between the step B3 and the step B4, and the fixed end anchor with the fork lugs is subjected to corrosion prevention treatment:
pouring the anti-corrosion material from the pouring holes of the anchor plate positioned below until the anti-corrosion material overflows from the pouring holes positioned above the anchor plate to stop pouring; anticorrosive materials are sprayed or smeared on the surfaces of the end face of the anchor plate and the conical anti-slip key, sealing materials are placed in annular grooves of the end face of the anchor plate, and a protective cover is installed.
Step B9 is included after step B8:
(1) carrying out anti-corrosion treatment on the anchor at the tensioning end;
(2) and carrying out corrosion prevention treatment on the inhaul cable exposed metal piece.
Due to the adoption of the structure, the tapered anti-slip key anchoring steel strand inhaul cable with the fork ears and the construction method thereof have the following beneficial effects compared with the prior art:
1. Reliable anchoring of anchorage
The invention relates to a tapered anti-slip key anchoring steel strand inhaul cable with fork lugs, which comprises a fixed end anchorage with fork lugs, a inhaul cable body and a tensioning end anchorage, wherein the fixed end anchorage with fork lugs comprises fork lugs and a tapered anti-slip key anchoring anchorage; the cone-shaped anti-slip key anchoring anchorage device comprises a cone-shaped anti-slip key, an anchor plate and a sealing cylinder, wherein the cone-shaped anti-slip key is a circular sleeve with one end provided with a cone outer surface; the cone-shaped anti-slip key is extruded at the end part of each steel strand, and the cone outer surface of the cone-shaped anti-slip key is embedded in the cone hole of the anchor plate; the anchor plate is connected with the fork lugs, the anchor plate is also connected with one end of the sealing cylinder, a sealing device is arranged in a hole at the other end of the sealing cylinder, and an anti-corrosion material is poured into the sealing cylinder. Because the conical anti-slip key is adopted in the invention, the conical outer surface of the conical anti-slip key and the conical hole of the anchor plate form conical surface contact, and compared with the plane contact in the prior art, the bearing area is greatly increased, so that the anchoring of the steel strand is safer and more reliable.
2. Can reduce the size of the anchor, save materials and production cost
The invention adopts the cone-shaped anti-slip key, the cone outer surface of which is in conical surface contact with the anchor plate cone hole, thus increasing the bearing area, correspondingly reducing the outer diameter of the cone-shaped anti-slip key on the premise of ensuring reliable anchoring, further reducing the space between the anchor plate holes and the size of the whole anchor, thereby achieving the purposes of saving raw materials and saving production cost.
3. Can reduce the wind resistance coefficient of the inhaul cable and improve the wind and rain shock excitation resistance
Because the cone-shaped anti-slip key is adopted, the cone-shaped outer surface of the cone-shaped anti-slip key is in cone-shaped contact with the anchor plate cone hole, and the bearing area is increased, so that the outer diameter of the cone-shaped anti-slip key can be reduced, the space between the anchor plate holes is reduced, the outer diameter of a inhaul cable is further reduced, the wind resistance coefficient of the inhaul cable is reduced, and the wind and rain shock excitation resistance of the inhaul cable is improved.
4. Convenient installation and construction
(1) The invention adopts the cone-shaped anti-slip key, and the cone outer surface of the cone-shaped anti-slip key is contacted with the cone hole of the anchor plate to form a cone surface, so that the automatic positioning and centering of the steel strand can be realized, thereby facilitating the construction.
(2) The cone-shaped anti-slip key anchoring anchorage device also comprises a pull rod, one end of the pull rod penetrates through the sealing device to be in threaded connection with a threaded hole positioned on the end face of the straight hole end of the anchor plate, and the other end of the pull rod is sleeved with a nut for compressing the sealing device. Therefore, the pull rod can realize the sealing of the inner cavity of the anchor through screwing in the nut to compress the sealing device, and meanwhile, the pull rod also plays a role in one-to-one corresponding positioning of the steel strand holes of the sealing device and the anchor holes of the anchor plate, so that the installation is convenient, and later rope threading is facilitated.
The HDPE telescopic device is connected with the lower end part of the fork lug through bolts or threads or is directly welded, the centering is not affected by construction errors, and the construction is convenient.
5. Short construction period
According to the invention, the fork lug cone type anti-slip key anchoring steel strand inhaul cable is directly hung on the bridge deck for tensioning after being assembled, and the anti-corrosion material is poured, so that the curing time of the epoxy mortar is saved, and the construction period is shorter than that of an inhaul cable with the epoxy mortar poured on site.
6. Good antiseptic effect
The inhaul cable body adopted by the invention has excellent anti-corrosion sealing performance and excellent anti-fatigue performance, and the fixed end anchor with the fork lugs has two different structures filled with anti-corrosion materials: firstly, pouring holes are formed in the sealing cylinder, the anchor plate and the lower ends of the fork lugs, and anti-corrosion materials are poured into the sealing cylinder through the pouring holes, wherein the anti-corrosion materials are oily wax, anti-corrosion grease or water-swelling flame-retardant rust-proof non-drying sealing paste and the like, so that the overall permanent corrosion resistance of the interior of the anchor can be realized; the second is to add the protective cover on the anchor plate, which can realize double-layer sealing corrosion prevention and has more excellent sealing corrosion prevention effect. Therefore, the invention has better anti-corrosion effect.
7. Can avoid a series of problems caused by adopting finished ropes in the prior art
Because the inhaul cable body is a steel strand bundle formed by a plurality of parallel unbonded prestressed steel strands, the HDPE outer protective sleeve and the steel strands are mutually independent, the steel strands can be subjected to field blanking installation, the blanking length requirement is low, the transportation cost is low, and a large-scale transportation tool is not needed; the HDPE outer sheath pipe is mutually independent with the steel stranded wires, so that the HDPE outer sheath pipe only protects the steel stranded wires, does not participate in stress and does not generate stress cracking. Therefore, the invention can avoid the series problems of complex and tedious manufacturing process, high precision requirement of blanking length, stress cracking of HDPE sheath, easy damage to the outer sheath tube of the inhaul cable, poor corrosion resistance of the inhaul cable, large transport means, large hoisting and traction equipment and difficult rope hanging caused by adopting the finished rope.
8. Can reduce the thickness of the tower wall and make the cable tower more beautiful
The tapered anti-slip key anchoring steel strand inhaul cable with the fork lugs adopts the fixed end anchorage with the fork lugs, and only the lug plates for connecting the fork lugs are required to be arranged at the tower ends, so that no embedded pipe is required, the thickness of the tower wall can be correspondingly reduced, and the cable tower is more attractive.
9. Good waterproof performance
The invention is coated on the outer circumferential surface of the connection between the anchor plate and the fork lugsIs provided withThe sealing material A is thread sealing glue or silicone sealing glue or polysulfide sealing glue, and has good waterproof performance.
In addition, the outer HDPE protective sleeve is sleeved outside the inhaul cable body, one end of the outer HDPE protective sleeve is connected with the waterproof cover, and the waterproof cover can play a role in protecting the stretching end anchor of the beam end; the HDPE telescoping device has been cup jointed outward to HDPE outer sheath's the other end, and HDPE telescoping device connects the lower extreme tip at the fork ear, still can cover the ground tackle in the inside through this HDPE telescoping device, plays the guard action to the ground tackle.
The technical features of the tapered anti-slip key anchoring steel strand inhaul cable with the fork lugs and the construction method thereof are further described below with reference to the accompanying drawings and the embodiments.
Drawings
FIG. 1 is a schematic structural view of a tapered anti-slip key anchored steel strand cable with a fork according to the present invention,
Figure 2 is a schematic view of the structure of the fixed end anchor with fork lugs according to the embodiment,
figure 3 is a schematic view of the structure of the tapered anti-slip key anchor according to one embodiment,
figure 4 is a schematic view of a structure of a fixed end anchor with a fork ear according to the second embodiment,
figure 5 is a schematic view of the structure of the tapered anti-slip key anchor according to the second embodiment,
fig. 6: embodiment three the structure of the filament dividing plate is schematically shown,
fig. 7: embodiment three the guy cable field assembly schematic diagram,
fig. 8: in the third embodiment, the anchor plate hole is smaller than the outer diameter of the PE sheath steel strand,
fig. 9: in the third embodiment, the anchor plate hole is smaller than the outer diameter of the PE sheath steel strand,
fig. 10: in the third embodiment, the anchor plate hole is smaller than the outer diameter of the PE sheath steel strand,
fig. 11: in the third embodiment, the method for threading the steel strand with the anchor plate hole larger than the outer diameter of the PE sheath steel strand is shown in the first schematic diagram,
fig. 12: in the third embodiment, the anchor plate hole is larger than the outer diameter of the PE sheath steel strand, and the method for threading the steel strand is schematically shown in the second embodiment.
In the above figures, the reference numerals are as follows:
1-a fixed end anchorage with a fork ear,
11-lugs, 111-set screws, 112-pouring holes B,
12-cone anti-skid key anchoring anchorage, 121-anti-skid key limiting device, 1211-compression plate, 1212-bolt,
122-conical anti-slip keys, 1221-conical outer surface, 1222-cylindrical outer surface, 123-anchor plate,
124-tie rod, 125-sealing cylinder, 1251-pouring orifice A, 126-sealing device, 127-nut,
128-a pressure plate, 129-a protective cover,
2-inhaul cable body, 3-stretching end anchorage, 4-HDPE expansion device, 5-HDPE outer protective sleeve,
6-waterproof cover and 7-wire dividing plate.
Detailed Description
Example 1
The utility model provides a take fork ear awl anti-skidding key anchor steel strand wires cable, includes take the stiff end ground tackle 1 of fork ear, cable body 2, stretch-draw end ground tackle 3, wherein:
the inhaul cable body 2 is a steel strand bundle composed of a plurality of parallel unbonded prestressed steel strands, each unbonded prestressed steel strand (hereinafter referred to as a steel strand for short) is a PE sheath steel strand, and both ends of the steel strand are exposed steel strands after the PE sheath is stripped;
the fixed end anchorage device 1 with the fork lugs comprises fork lugs 11 and cone-shaped anti-slip key anchorage devices 12;
the fork lug is of a conventional structure, the upper end of the fork lug is provided with two side lug plates, and the two side lug plates are provided with coaxial pin shaft holes; the lower end of the fork ear is provided with an internal threaded hole for connecting an anchor;
The cone-shaped anti-slip key anchoring anchorage 12 comprises a cone-shaped anti-slip key 122, an anchor plate 123, a pull rod 124, a sealing cylinder 125 and a sealing device 126; the cone-shaped anti-slip key 122 is a circular sleeve with a cone outer surface 1221 at one end and a cylinder outer surface 1222 at the other end, and is in a pen point shape as a whole; the cone-shaped anti-slip keys 122 penetrate into the steel strands and are extruded at the end parts of the steel strands, and the cone-shaped outer surfaces 1221 of the cone-shaped anti-slip keys 122 are embedded in the cone holes of the anchor plates 123; the taper of the conical outer surface of the conical anti-slip key is matched with the taper of the anchor plate taper hole, and the taper angles of the conical outer surface of the conical anti-slip key and the anchor plate taper hole are in the range of 2 alpha, 2 alpha: 0 DEG < 2 alpha < 180 deg.
An anti-slip key limiting device 121 is further connected to one side of the taper hole end of the anchor plate 123, the anti-slip key limiting device 121 comprises a pressing plate 1211, the pressing plate 1211 is connected to one side of the taper hole end of the anchor plate 123 through a bolt 1212, and the pressing plate 1211 is pressed on the end face of the cylindrical outer surface end of the tapered anti-slip key 122.
The outer circle surface of the anchor plate 123 is provided with external threads, the anchor plate 123 is in threaded connection with an internal threaded hole at the lower end of the fork lug 11, the anchor plate 123 is also in threaded connection with one end of the sealing cylinder 125, the sealing device 126 is arranged in the hole at the other end of the sealing cylinder 125, and the pressing plate 128 is arranged outside the sealing device 126;
One end of the pull rod 124 sequentially passes through the pressing plate 128 and the sealing device 126 to be in threaded connection with a threaded hole positioned on the end face of the straight hole end of the anchor plate 123, and the other end of the pull rod 124 is sleeved with a nut 127 for compressing the sealing device 126 so as to realize the sealing of the cavity in the anchor; the sealing device 126 is well known in the art and includes a sealing ring, a sealing plate, a pressing plate, etc. which are connected together.
A set screw 111 for positioning and preventing loosening is also arranged on the side wall of the fork lug 11 connected with the anchor plate 123, and the tip of the set screw 111 is propped against the outer circular surface of the anchor plate 123; the outer circumferential surface of the anchor plate 123 connected with the fork lug 11 is coated with a layer of sealing material A, wherein the sealing material A is screw thread sealing glue, silicone sealing glue, polysulfide sealing glue or the like.
The side wall of the sealing cylinder 125 is provided with a pouring hole A1251, an anchor plate is provided with a pouring hole C (the pouring hole C is not shown in the figure) along the axial direction, the side wall of the lower end of the fork ear 11 is provided with a pouring hole B112, and the sealing cylinder 125 is internally poured with an anti-corrosion material which is oily wax or anti-corrosion grease or water-swelling flame-retardant anti-rust non-drying sealing paste and the like. Wherein, the water-swelling flame-retardant rust-proof self-adhesive sealant is disclosed in the application publication number of CN 108384488A.
The stay rope body 2 is also sleeved with an HDPE outer protective sleeve 5, one end of the HDPE outer protective sleeve 5 is connected with a waterproof cover 6, the other end of the HDPE outer protective sleeve 5 is sleeved with an HDPE telescoping device 4, the HDPE telescoping device 4 is connected with the lower end of the fork lug 11 through bolts or threads or is directly welded with the lower end of the fork lug 11, and the HDPE telescoping device 4 adopts known technology.
Also, the tension end anchor 3 is a well-known adjustable cable clip anchor, and the structure thereof will not be described in detail.
Example two
The basic structure of the cable is the same as that of the first embodiment, and the cable comprises a fixed end anchor 1 with a fork lug, a cable body 2 and a tensioning end anchor 3, wherein the difference is that the positions of the pouring holes are different, the sealing barrel 125 of the second embodiment is not provided with the pouring holes A, the lower end of the fork lug 11 is also not provided with the pouring holes B112, and the anchor plate 123 is provided with symmetrical pouring holes C and D along the axial direction. The specific structure of the second embodiment is as follows:
the utility model provides a take fork ear awl anti-skidding key anchor steel strand wires cable, includes take the stiff end ground tackle 1 of fork ear, cable body 2, stretch-draw end ground tackle 3, wherein:
the inhaul cable body 2 is a steel strand bundle composed of a plurality of parallel unbonded prestressed steel strands, each unbonded prestressed steel strand (hereinafter referred to as a steel strand for short) is a PE sheath steel strand, and both ends of the steel strand are exposed steel strands after the PE sheath is stripped;
The fixed end anchorage device 1 with the fork lugs comprises fork lugs 11 and cone-shaped anti-slip key anchorage devices 12;
the fork ear is of a conventional structure, the upper end of the fork ear is provided with two ear plates, and the two ear plates are provided with coaxial pin shaft holes; the lower end of the fork ear is provided with an internal threaded hole for connecting an anchor;
the cone-shaped anti-slip key anchoring anchorage 12 comprises a cone-shaped anti-slip key 122, an anchor plate 123, a pull rod 124, a sealing cylinder 125 and a sealing device 126; the cone-shaped anti-slip key 122 is a circular sleeve with a cone outer surface 1221 at one end and a cylinder outer surface 1222 at the other end, and is in a pen point shape as a whole; the cone-shaped anti-slip keys 122 penetrate into the steel strands and are extruded at the end parts of the steel strands, and the cone-shaped outer surfaces 1221 of the cone-shaped anti-slip keys 122 are embedded in the cone holes of the anchor plates 123; the taper of the conical outer surface of the conical anti-slip key is matched with the taper of the anchor plate taper hole, and the taper angles of the conical outer surface of the conical anti-slip key and the anchor plate taper hole are in the range of 2 alpha, 2 alpha: 0 DEG < 2 alpha < 180 deg.
An anti-slip key limiting device 121 is further connected to one side of the taper hole end of the anchor plate 123, the anti-slip key limiting device 121 comprises a pressing plate 1211, the pressing plate 1211 is connected to one side of the taper hole end of the anchor plate 123 through a bolt 1212, and the pressing plate 1211 is pressed on the end face of the cylindrical outer surface end of the tapered anti-slip key 122.
The outer circle surface of the anchor plate 123 is provided with external threads, the anchor plate 123 is in threaded connection with an internal threaded hole at the lower end of the fork lug 11, the anchor plate 123 is also in threaded connection with one end of the sealing cylinder 125, the sealing device 126 is arranged in the hole at the other end of the sealing cylinder 125, and the pressing plate 128 is arranged outside the sealing device 126;
the anchor plate 123 is also provided with a filling hole C and a filling hole D (not shown in the figure) which are symmetrical along the axial direction, the filling hole C and the filling hole D are staggered with the anchor hole, an annular groove is formed in the end face of the taper hole end of the anchor plate, a sealing material B is placed in the annular groove, and a protective cover 129 is pressed on the sealing material B in the annular groove so as to realize sealing; the sealing material B can be sealing putty, water-swelling rubber sealing strips, silicone sealing glue, polysulfide sealing glue, thread sealing glue and the like. The sealing cylinder 125 is filled with an anti-corrosion material which is oily wax or anti-corrosion grease or water-swelling flame-retardant rust-proof non-drying sealing paste and the like. Wherein, the water-swelling flame-retardant rust-proof self-adhesive sealant is disclosed in the application publication number of CN 108384488A.
One end of the pull rod 124 sequentially passes through the pressing plate 128 and the sealing device 126 to be in threaded connection with a threaded hole positioned on the end face of the straight hole end of the anchor plate 123, and the other end of the pull rod 124 is sleeved with a nut 127 for compressing the sealing device 126 so as to realize the sealing of the cavity in the anchor; the sealing device 126 is well known in the art and includes a sealing ring, a sealing plate, a pressing plate, etc. which are connected together.
A set screw 111 for positioning and preventing loosening is also arranged on the side wall of the fork lug 11 connected with the anchor plate 123, and the tip of the set screw 111 is propped against the outer circular surface of the anchor plate 123; the outer circumferential surface of the anchor plate 123 connected with the fork lug 11 is coated with a layer of sealing material A, wherein the sealing material A is screw thread sealing glue, silicone sealing glue, polysulfide sealing glue or the like.
The stay rope body 2 is also sleeved with an HDPE outer protective sleeve 5, one end of the HDPE outer protective sleeve 5 is connected with a waterproof cover 6, the other end of the HDPE outer protective sleeve 5 is sleeved with an HDPE telescoping device 4, the HDPE telescoping device 4 is connected with the lower end of the fork lug 11 through bolts or threads or is directly welded with the lower end of the fork lug 11, and the HDPE telescoping device 4 adopts known technology.
Also, the tension end anchor 3 is a well-known adjustable cable clip anchor, and the structure thereof will not be described in detail.
Example III
A construction method for anchoring a steel strand inhaul cable with a tapered anti-slip key with a fork ear comprises the steps of firstly fixing a tension end anchor on a pre-embedded bearing embedded part at a beam end, then enabling a steel strand to pass through the tapered anti-slip key anchoring anchor, extruding the tapered anti-slip key at one end part of the steel strand, and enabling the tapered outer surface of the tapered anti-slip key to be embedded in a tapered hole of an anchor plate; the fork lugs are connected with the cone-shaped anti-slip key anchoring anchors to form fixed end anchors with fork lugs, and the fixed end anchors with fork lugs are pinned on the lug plates at the tower ends; and (3) pulling the other end of the steel strand to pass through an anchor at the tensioning end, tensioning the steel strand by a single tensioning jack until the cable force is calculated, then anchoring the steel strand, and carrying out clamping piece jacking after all the steel strands are installed and tensioned.
The method comprises the following steps:
A. preparation work
A1. Welding an HDPE outer sheath pipe;
A11. calculating the length of the HDPE outer sheath pipe of the inhaul cable according to the design length of the inhaul cable, the length of the embedded pipe at the beam end and the length of each relevant assembly of the inhaul cable;
A12. welding an HDPE outer protective sleeve according to the calculated length;
A2. blanking a steel strand;
A21. calculating the blanking length of the steel strand according to the design cable length, the anchor length and the tensioning operation length of the inhaul cable, and calculating the length to be stripped of PE sheaths at two ends;
A22. calculating length blanking according to the steel strand, and stripping PE sheaths at two ends according to requirements;
A23. cleaning the surface of the steel strand to prevent corrosion grease or wax;
B. cable assembly
B1. Placing the welded HDPE outer sheath pipe on a bracket horizontally, connecting the HDPE outer sheath pipe with a waterproof cover positioned at the beam end, and sleeving the HDPE telescoping device positioned at the tower end outside the other end of the HDPE outer sheath pipe; placing a conical anti-slip key anchoring anchor in front of the HDPE outer sheath pipe at the tower end, reserving a steel strand connecting operation space with the end face of the HDPE outer sheath pipe, and temporarily fixing a fixed end anchor with a fork lug with a bracket;
B2. placing a wire dividing plate for layered positioning of the steel strands, ensuring that the hole positions of the wire dividing plate correspond to the hole positions of the anchors one by one, wherein the wire dividing plate is a known technology and has a structure shown in figure 6;
B3. Threading steel strands and extruding anti-slip keys: there are two modes of threading depending on the anchor design:
(1) firstly, threading steel strands and then extruding anti-skid keys:
when the design size of the anchor plate hole is larger than the diameter of the steel strand but smaller than the overall diameter of the PE sheath steel strand, one end of the fixed end of the steel strand passes through the wire separating plate and is connected with a rope penetrating device (the rope penetrating device is a known technology), then a waterproof cover and an HDPE outer sheath pipe are sequentially penetrated, the steel strand is taken down, passes through a corresponding hole of a conical anti-sliding key anchoring anchorage (see figure 8), then the conical anti-sliding key is extruded (see figure 9), the steel strand is pulled back, the conical outer surface of the conical anti-sliding key is embedded into the conical hole of the anchor plate (see figure 10), and after all the steel strands are penetrated, an anti-sliding key limiting device is installed;
(2) extruding an anti-slip key and then penetrating a steel strand:
when the design size of the anchor plate hole is larger than the overall diameter of the PE sheath steel strand, firstly extruding the cone-shaped anti-slip key, penetrating from the anchor plate end face of the cone-shaped anti-slip key anchoring anchor, penetrating through the cone-shaped anti-slip key anchoring anchor (see figure 11), connecting with a steel strand traction device (the steel strand traction device is a known technology and is the same as the cable penetrating device), and then penetrating through the HDPE outer sheath pipe, the waterproof cover and the corresponding hole of the wire dividing plate in sequence until the cone outer surface of the cone-shaped anti-slip key is embedded in the cone hole of the anchor plate (see figure 12); after all the steel strands penetrate, an anti-sliding key limiting device is installed;
B4. The method comprises the steps of connecting a fork lug with an anchor plate of a cone anti-slip key anchoring anchor to form a fixed end anchor with a fork lug, installing a set screw after the fork lug is screwed in place, ensuring that after the fixed end anchor with the fork lug is connected with an ear plate at the tower end, fixing end anchor holes with the fork lug correspond to beam end stretching end anchor holes one by one, and coating a layer of sealing material A on the outer circumferential surface of the anchor plate connected with the fork lug, wherein the sealing material A is screw thread sealing glue, silicone sealing glue, polysulfide sealing glue or the like;
b4-1, carrying out anti-corrosion treatment on a fixed end anchor with a fork lug:
the symmetrical alternately-tightening nut compression sealing device realizes the sealing of the inner cavity of the anchorage device, the anti-corrosion material is poured from the pouring hole A of the sealing cylinder to the pouring hole B on the fork lug, the anti-corrosion material overflows to stop pouring, and the pouring hole A and the pouring hole B are provided with plugs; the anti-corrosion material is oily wax, anti-corrosion grease or water-swelling flame-retardant anti-rust non-drying sealing paste and the like;
B5. the HDPE outer protective sleeve, the HDPE telescopic device and the fixed end anchor with the fork lugs are firmly fixed, and a hoisting rope is arranged;
B6. the stay cable is hoisted, the stay cable is hoisted to the position near the lug plate of the corresponding cable number at the tower end through a hoisting rope, a tower end worker pulls the stay cable to be in place, and the fork lugs of the stay cable are connected with the lug plate at the tower end at the fixed end to lock the pin shaft;
B7. Adjusting a stretching end anchor of the beam end to enable the hole position of the stretching end anchor to be consistent with the hole position of a fixed end anchor with a fork lug of the tower end, sequentially taking out the steel strands from the wire dividing plate from top to bottom, connecting the steel strands with connectors of traction ropes extending out of the stretching end anchor, enabling the steel strands to penetrate through the stretching end anchor, stretching the steel strands by using a stretching jack until the cable force is calculated, and anchoring the steel strands until all the steel strands are installed and stretched;
when the total cable force of single tensioning does not reach the design requirement, or the bridge deck monitoring data does not reach the design requirement, overall tensioning is carried out according to the requirement;
B8. and (3) jacking and pressing the clamping piece: and the clamping piece of the tension end anchorage device is jacked, so that the retraction loss of the anchorage device clamping piece is reduced.
B9. And (3) antiseptic treatment:
(1) carrying out corrosion prevention treatment on the anchor at the tensioning end according to the conventional technology;
(2) the cable exposed metal piece is subjected to corrosion prevention treatment of the same level as the bridge exposed metal piece according to the conventional technology.
Embodiment four:
the construction method of the tapered anti-slip key anchoring steel strand inhaul cable with a fork ear according to the second embodiment is basically the same as that of the third embodiment, and is different in that: the steps of pouring the anti-corrosion material into the anchorage device are different. The construction method of the tapered anti-slip key anchoring steel strand inhaul cable with the fork ears in the embodiment is as follows:
The construction method for anchoring the steel strand inhaul cable with the tapered anti-slip key with the fork ears of the second embodiment comprises the steps of firstly fixing an anchor at a tensioning end on a pre-buried bearing embedded part at a beam end, then enabling the steel strand to pass through the anchor at the tapered anti-slip key, extruding the tapered anti-slip key at one end part of the steel strand, and enabling the tapered outer surface of the tapered anti-slip key to be embedded in a tapered hole of an anchor plate; the fork lugs are connected with the cone-shaped anti-slip key anchoring anchors to form fixed end anchors with fork lugs, and the fixed end anchors with fork lugs are pinned on the lug plates at the tower ends; and (3) pulling the other end of the steel strand to pass through an anchor at the tensioning end, tensioning the steel strand by a single tensioning jack until the cable force is calculated, then anchoring the steel strand, and carrying out clamping piece jacking after all the steel strands are installed and tensioned.
The method comprises the following steps:
A. preparation work
A1. Welding an HDPE outer sheath pipe;
A11. calculating the length of the HDPE outer sheath pipe of the inhaul cable according to the design length of the inhaul cable, the length of the embedded pipe at the beam end and the length of each relevant assembly of the inhaul cable;
A12. welding an HDPE outer protective sleeve according to the calculated length;
A2. blanking a steel strand;
A21. calculating the blanking length of the steel strand according to the design cable length, the anchor length and the tensioning operation length of the inhaul cable, and calculating the length to be stripped of PE sheaths at two ends;
A22. Calculating length blanking according to the steel strand, and stripping PE sheaths at two ends according to requirements;
A23. cleaning the surface of the steel strand to prevent corrosion grease or wax;
B. cable assembly
B1. Placing the welded HDPE outer sheath pipe on a bracket horizontally, connecting the HDPE outer sheath pipe with a waterproof cover positioned at the beam end, and sleeving the HDPE telescoping device positioned at the tower end outside the other end of the HDPE outer sheath pipe; placing a conical anti-slip key anchoring anchor in front of the HDPE outer sheath pipe at the tower end, reserving a steel strand connecting operation space with the end face of the HDPE outer sheath pipe, and temporarily fixing a fixed end anchor with a fork lug with a bracket;
B2. placing a wire dividing plate for layered positioning of the steel strands, ensuring that the hole positions of the wire dividing plate correspond to the hole positions of the anchors one by one, wherein the wire dividing plate is a known technology and has a structure shown in figure 6;
B3. threading steel strands and extruding anti-slip keys: there are two modes of threading depending on the anchor design:
(1) firstly, threading steel strands and then extruding anti-skid keys:
when the design size of the anchor plate hole is larger than the diameter of the steel strand but smaller than the overall diameter of the PE sheath steel strand, one end of the fixed end of the steel strand passes through the wire separating plate and is connected with a rope penetrating device (the rope penetrating device is a known technology), then a waterproof cover and an HDPE outer sheath pipe are sequentially penetrated, the steel strand is taken down to pass through a corresponding hole of a conical anti-sliding key anchoring anchor, then the conical anti-sliding key is extruded, the steel strand is pulled back until the conical outer surface of the conical anti-sliding key is embedded in the conical hole of the anchor plate, and an anti-sliding key limiting device is installed after all the steel strands are penetrated;
(2) Extruding an anti-slip key and then penetrating a steel strand:
when the design size of the anchor plate hole is larger than the overall diameter of the PE sheath steel strand, firstly extruding the cone-shaped anti-slip key, penetrating through the anchor plate end face of the cone-shaped anti-slip key anchoring anchor, connecting with the steel strand traction device through the cone-shaped anti-slip key anchoring anchor, and sequentially penetrating through the HDPE outer sheath pipe, the waterproof cover and the corresponding hole of the wire dividing plate until the cone-shaped outer surface of the cone-shaped anti-slip key is embedded in the cone hole of the anchor plate; after all the steel strands penetrate, an anti-sliding key limiting device is installed;
b3-1, carrying out anti-corrosion treatment on the fixed end anchor with the fork lugs:
symmetrically and alternately tightening the nut compression sealing device to realize the sealing of the inner cavity of the anchor device, pouring the anti-corrosion material from the pouring hole D of the anchor plate positioned below until the anti-corrosion material overflows from the pouring hole C positioned above the anchor plate to stop pouring, and installing plugs on the two pouring holes; spraying or smearing anti-corrosion materials on the surfaces of the end face of the anchor plate and the conical anti-slip key, placing sealing materials B in annular grooves on the end face of the anchor plate, and installing a protective cover; the anti-corrosion material is oily wax, anti-corrosion grease or water-swelling flame-retardant anti-rust non-drying sealing paste and the like; the sealing material B can be sealing putty, water-swelling rubber sealing strips, silicone sealing glue, polysulfide sealing glue, thread sealing glue and the like;
B4. The method comprises the steps of connecting a fork lug with an anchor plate of a cone anti-slip key anchoring anchor to form a fixed end anchor with a fork lug, installing a set screw after the fork lug is screwed in place, ensuring that after the fixed end anchor with the fork lug is connected with an ear plate at the tower end, fixing end anchor holes with the fork lug correspond to beam end stretching end anchor holes one by one, and coating a layer of sealing material A on the outer circumferential surface of the anchor plate connected with the fork lug, wherein the sealing material A is screw thread sealing glue, silicone sealing glue, polysulfide sealing glue or the like;
B5. the HDPE outer protective sleeve, the HDPE telescopic device and the fixed end anchor with the fork lugs are firmly fixed, and a hoisting rope is arranged;
B6. the stay cable is hoisted, the stay cable is hoisted to the position near the lug plate of the corresponding cable number at the tower end through a hoisting rope, a tower end worker pulls the stay cable to be in place, and the fork lugs of the stay cable are connected with the lug plate at the tower end at the fixed end to lock the pin shaft;
B7. adjusting a stretching end anchor of the beam end to enable the hole position of the stretching end anchor to be consistent with the hole position of a fixed end anchor with a fork lug of the tower end, sequentially taking out the steel strands from the wire dividing plate from top to bottom, connecting the steel strands with connectors of traction ropes extending out of the stretching end anchor, enabling the steel strands to penetrate through the stretching end anchor, stretching the steel strands by using a stretching jack until the cable force is calculated, and anchoring the steel strands until all the steel strands are installed and stretched;
When the total cable force of single tensioning does not reach the design requirement, or the bridge deck monitoring data does not reach the design requirement, overall tensioning is carried out according to the requirement;
B8. and (3) jacking and pressing the clamping piece: and the clamping piece of the tension end anchorage device is jacked, so that the retraction loss of the anchorage device clamping piece is reduced.
B9. And (3) antiseptic treatment:
(1) carrying out corrosion prevention treatment on the anchor at the tensioning end according to the conventional technology;
(2) the cable exposed metal piece is subjected to corrosion prevention treatment of the same level as the bridge exposed metal piece according to the conventional technology.
Claims (10)
1. The utility model provides a take fork ear awl anti-skidding key anchor steel strand wires cable, includes take the stiff end ground tackle (1) of fork ear, cable rope body (2), stretch-draw end ground tackle (3), its characterized in that: the inhaul cable body (2) is a steel strand bundle consisting of a plurality of parallel unbonded prestressed steel strands; the fixed end anchorage device (1) with the fork lugs comprises fork lugs (11) and cone-shaped anti-slip key anchorage devices (12); the conical anti-slip key anchoring anchorage device (12) comprises a conical anti-slip key (122), an anchor plate (123) and a sealing cylinder (125), wherein the conical anti-slip key (122) is a round sleeve with a conical outer surface (1221) at one end, the conical anti-slip key (122) is extruded at the end part of each steel strand, and the conical outer surface (1221) of the conical anti-slip key (122) is embedded in a conical hole of the anchor plate (123); the anchor plate (123) is connected with the fork lug (11), the anchor plate (123) is also connected with one end of the sealing cylinder (125), a sealing device (126) is arranged in the hole at the other end of the sealing cylinder (125), and an anti-corrosion material is poured into the sealing cylinder (125).
2. The tapered anti-slip key anchored steel strand cable with a fork of claim 1, wherein: an anti-skid key limiting device (121) is further connected to one side of the taper hole end of the anchor plate (123); the cone-shaped anti-slip key anchoring anchorage device (12) further comprises a pull rod (124), one end of the pull rod (124) penetrates through the sealing device (126) to be connected with the anchor plate (123), and the other end of the pull rod (124) is sleeved with a nut (127) for compressing the sealing device (126).
3. The tapered anti-slip key anchored steel strand cable with a fork of claim 1, wherein: the side wall of the fork lug (11) connected with the anchor plate (123) is also provided with a set screw (111) for positioning and locking, and the tip of the set screw (111) is propped against the outer circle surface of the anchor plate (123); a layer of sealing material A is coated on the outer circumferential surface of the anchor plate (123) connected with the fork lugs (11), and the sealing material A is thread sealing glue or silicone sealing glue or polysulfide sealing glue.
4. The tapered anti-slip key anchored steel strand cable with a fork of claim 1, wherein: a filling hole A (1251) is formed in the sealing cylinder (125), a filling hole B (112) is formed in the fork lug (11), and a filling hole C is formed in the anchor plate (123); or the anchor plate (123) is provided with a symmetrical pouring hole C and a symmetrical pouring hole D, the end face of the taper hole end of the anchor plate is provided with an annular groove, a sealing material B is placed in the annular groove, and a protective cover (129) is pressed on the sealing material B; the sealing material B is sealing putty, a water-swelling rubber sealing strip, silicone sealing glue, polysulfide sealing glue or thread sealing glue; the anti-corrosion material is oily wax or anti-corrosion grease or water-swelling flame-retardant anti-rust non-drying sealing paste.
5. The tapered anti-slip key anchored steel strand cable with a fork of claim 1, wherein: each strand of steel strand is a PE sheath steel strand; the outer sleeve (5) of HDPE has been cup jointed outside cable body (2), and the one end of this HDPE outer sleeve (5) is connected with buckler (6), and HDPE telescoping device (4) has been cup jointed outside the other end of HDPE outer sleeve (5), and HDPE telescoping device (4) are connected in the tip of fork ear (11).
6. A construction method of a tapered anti-slip key anchoring steel strand inhaul cable with fork lugs is characterized by comprising the following steps: the method comprises the steps of firstly fixing a tensioning end anchor on a pre-buried pressure-bearing embedded part at a beam end, then enabling a steel strand to pass through an HDPE outer protective sleeve and a conical anti-slip key anchor, and extruding the conical anti-slip key at one end part of the steel strand to enable the conical outer surface of the conical anti-slip key to be embedded in a conical hole of an anchor plate; the fork lugs are connected with the cone-shaped anti-slip key anchoring anchors to form fixed end anchors with fork lugs, and the fixed end anchors with fork lugs are pinned on the lug plates at the tower ends; and (3) pulling the other end of the steel strand to pass through an anchor at the tensioning end, tensioning the steel strand by a single tensioning jack until the cable force is calculated, then anchoring the steel strand, and carrying out clamping piece jacking after all the steel strands are installed and tensioned.
7. The construction method of the tapered anti-slip key anchoring steel strand inhaul cable with the fork ears, which is characterized by comprising the following steps of: the method comprises the following steps:
A. preparation work
A1. Welding an HDPE outer sheath pipe;
A2. blanking a steel strand;
B. cable assembly
B1. Connecting one end of the welded HDPE outer protective sleeve with a waterproof cover, and sleeving the tower end HDPE telescopic device outside the other end of the HDPE outer protective sleeve;
B2. placing a wire dividing plate for layered positioning of the steel strands, and ensuring that hole positions of the wire dividing plate correspond to anchor hole positions one by one;
B3. threading steel strands and extruding anti-slip keys: the steel strand passes through the conical anti-slip key to anchor the anchor device, and the conical anti-slip key is extruded at the end part of the fixed end of the steel strand, so that the conical outer surface of the conical anti-slip key is embedded in the conical hole of the anchor plate;
B4. the fork lugs are connected with an anchor plate of the cone anti-slip key anchoring anchor to form a fixed end anchor with the fork lugs, the fork lugs are screwed in place and then are provided with set screws, and a layer of sealing material A is coated on the outer circumferential surface of the anchor plate connected with the fork lugs;
B5. the HDPE outer protective sleeve, the HDPE telescopic device and the fixed end anchor with the fork lugs are firmly fixed, and a hoisting rope is arranged;
B6. hoisting the stay rope to the vicinity of the lug plate of the corresponding cable number at the tower end through the hoisting rope, pulling the stay rope to be in place, connecting the fork lugs of the stay rope with the lug plate at the tower end at the fixed end, and locking the pin shaft;
B7. Sequentially taking out the steel strands from the wire dividing plate, connecting the steel strands with connectors of traction ropes extending out of the stretching end anchors, penetrating the steel strands through the stretching end anchors, stretching the steel strands to the calculated rope force by using a stretching jack single stretching the steel strands, and anchoring the steel strands until all the steel strands are installed and stretched;
B8. and (3) jacking and pressing the clamping piece: and jacking the clamping piece of the tension end anchorage device.
8. The construction method of the tapered anti-slip key anchoring steel strand inhaul cable with the fork ears, which is characterized by comprising the following steps of: step B3, threading the steel strand and extruding the anti-skid key, or threading the steel strand first and extruding the anti-skid key:
when the design size of the anchor plate hole is larger than the diameter of the steel strand but smaller than the overall diameter of the PE sheath steel strand, one end of the fixed end of the steel strand passes through the wire separating plate and is connected with the rope penetrating device, then the waterproof cover and the HDPE outer sheath pipe are sequentially penetrated, the steel strand is taken down, passes through the corresponding hole of the conical anti-sliding key anchoring anchor, then the anti-sliding key is extruded, the steel strand is pulled back until the conical outer surface of the conical anti-sliding key is embedded into the conical hole of the anchor plate, and after all the steel strands are penetrated, the anti-sliding key limiting device is installed;
step B3, threading the steel strand and extruding an anti-skid key or extruding the anti-skid key first and then threading the steel strand:
When the design size of the anchor plate hole is larger than the overall diameter of the PE sheath steel strand, firstly extruding the cone-shaped anti-slip key, penetrating through the anchor plate end face of the cone-shaped anti-slip key anchoring anchor, connecting with the steel strand traction device through the cone-shaped anti-slip key anchoring anchor, and sequentially penetrating through the HDPE outer sheath pipe, the waterproof cover and the corresponding hole of the wire dividing plate until the cone-shaped outer surface of the cone-shaped anti-slip key is embedded in the cone hole of the anchor plate; and after all the steel strands pass through, installing an anti-skid key limiting device.
9. The construction method of the tapered anti-slip key anchoring steel strand inhaul cable with the fork ears according to claim 7 or 8, which is characterized in that: b4-1 is also included between the step B4 and the step B5, and the fixed end anchor with the fork lugs is subjected to corrosion prevention treatment:
pouring the anti-corrosion material from the pouring hole A of the sealing cylinder to the pouring hole B on the fork lug, wherein the anti-corrosion material overflows to stop pouring, and installing plugs on the pouring hole A and the pouring hole B;
step B9 is included after step B8:
(1) carrying out anti-corrosion treatment on the anchor at the tensioning end;
(2) and carrying out corrosion prevention treatment on the inhaul cable exposed metal piece.
10. The construction method of the tapered anti-slip key anchoring steel strand inhaul cable with the fork ears, which is characterized by comprising the following steps of: b3-1 is also included between the step B3 and the step B4, and the fixed end anchor with the fork lugs is subjected to corrosion prevention treatment:
Pouring the anti-corrosion material from the pouring holes of the anchor plate positioned below until the anti-corrosion material overflows from the pouring holes positioned above the anchor plate to stop pouring; spraying or smearing anti-corrosion materials on the surfaces of the end face of the anchor plate and the conical anti-slip key, placing sealing materials in an annular groove on the end face of the anchor plate, and installing a protective cover;
step B9 is included after step B8:
(1) carrying out anti-corrosion treatment on the anchor at the tensioning end;
(2) and carrying out corrosion prevention treatment on the inhaul cable exposed metal piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910580165.3A CN110258299B (en) | 2019-06-28 | 2019-06-28 | Tapered anti-slip key anchoring steel strand inhaul cable with fork lugs and construction method thereof |
Applications Claiming Priority (1)
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| CN111926704A (en) * | 2020-09-11 | 2020-11-13 | 开封市天力桥建工程结构有限公司 | Assembled parallel steel strand extrusion anchor cable and construction method |
| CN112572844B (en) * | 2020-12-23 | 2022-08-05 | 中国航天空气动力技术研究院 | Power nacelle |
| CN114775430A (en) * | 2022-04-13 | 2022-07-22 | 江阴法尔胜住电新材料有限公司 | Steel strand tie rod cable system with layered wire-dividing supporting structure and installation method |
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