CN113789720A - Construction method of carbon fiber inhaul cable - Google Patents
Construction method of carbon fiber inhaul cable Download PDFInfo
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- CN113789720A CN113789720A CN202110959215.6A CN202110959215A CN113789720A CN 113789720 A CN113789720 A CN 113789720A CN 202110959215 A CN202110959215 A CN 202110959215A CN 113789720 A CN113789720 A CN 113789720A
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- 229920000049 Carbon (fiber) Polymers 0.000 title claims abstract description 117
- 239000004917 carbon fiber Substances 0.000 title claims abstract description 117
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 117
- 238000010276 construction Methods 0.000 title claims abstract description 48
- 238000013461 design Methods 0.000 claims abstract description 28
- 238000004873 anchoring Methods 0.000 claims abstract description 14
- 229910000831 Steel Inorganic materials 0.000 claims description 30
- 238000000034 method Methods 0.000 claims description 30
- 239000010959 steel Substances 0.000 claims description 30
- 230000008569 process Effects 0.000 claims description 22
- 239000004698 Polyethylene Substances 0.000 claims description 16
- -1 polyethylene Polymers 0.000 claims description 16
- 229920000573 polyethylene Polymers 0.000 claims description 16
- 239000010410 layer Substances 0.000 claims description 12
- 230000001681 protective effect Effects 0.000 claims description 11
- 238000012544 monitoring process Methods 0.000 claims description 10
- 239000011241 protective layer Substances 0.000 claims description 10
- 238000011049 filling Methods 0.000 claims description 8
- 238000002360 preparation method Methods 0.000 claims description 8
- 239000004677 Nylon Substances 0.000 claims description 5
- 229920001778 nylon Polymers 0.000 claims description 5
- 238000004804 winding Methods 0.000 claims description 5
- 239000000725 suspension Substances 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 2
- 238000001192 hot extrusion Methods 0.000 claims description 2
- 238000007493 shaping process Methods 0.000 claims description 2
- 239000002131 composite material Substances 0.000 abstract description 6
- 238000001125 extrusion Methods 0.000 description 10
- 238000005259 measurement Methods 0.000 description 10
- 238000005520 cutting process Methods 0.000 description 8
- 230000035882 stress Effects 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000004364 calculation method Methods 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 238000012937 correction Methods 0.000 description 4
- 238000005246 galvanizing Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 239000003973 paint Substances 0.000 description 4
- 229920003023 plastic Polymers 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000006353 environmental stress Effects 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229920001903 high density polyethylene Polymers 0.000 description 2
- 239000004700 high-density polyethylene Substances 0.000 description 2
- 230000002262 irrigation Effects 0.000 description 2
- 238000003973 irrigation Methods 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000005094 computer simulation Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
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- 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
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B1/00—Constructional features of ropes or cables
- D07B1/02—Ropes built-up from fibrous or filamentary material, e.g. of vegetable origin, of animal origin, regenerated cellulose, plastics
- D07B1/025—Ropes built-up from fibrous or filamentary material, e.g. of vegetable origin, of animal origin, regenerated cellulose, plastics comprising high modulus, or high tenacity, polymer filaments or fibres, e.g. liquid-crystal polymers
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B1/00—Constructional features of ropes or cables
- D07B1/16—Ropes or cables with an enveloping sheathing or inlays of rubber or plastics
- D07B1/162—Ropes or cables with an enveloping sheathing or inlays of rubber or plastics characterised by a plastic or rubber enveloping sheathing
-
- 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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- Chemical & Material Sciences (AREA)
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Abstract
The invention relates to a construction method of a carbon fiber inhaul cable, which comprises the following steps: (1) preparing a carbon fiber inhaul cable; (2) traction of the inhaul cable: (2.1) calculating the traction force of the stay cable: according to the length of the stay cable, the distance L between the center of the anchor backing plate at the upper end and the center of the anchor backing plate at the lower end, namely the tower end and the beam end0And when the traction force is estimated to be T, the distance delta L between the lower end of the inhaul cable and the beam end anchor backing plate is as follows: Δ L ═ L0‑L+(ω2LX 2L0)/(24T2) TL/AE, related technical parameters of cable force and cables provided according to bridge design before construction: l is0、ω、L、LX、A. E, determining the number of soft traction carbon fiber bundles according to the relation between the traction force T and delta L when the anchor cup nut just rotates and flattens the end face of the anchor cup when each pair of inhaul cables are tensionedAnd a reserved length; (2.2) releasing a stay cable; (2.3) hanging a cable on the bridge tower; (2.4) hanging ropes at beam ends; (2.5) temporarily anchoring in the tower; (3) tensioning; (4) and (6) cable adjustment. The invention provides a construction method of a carbon fiber inhaul cable, and provides technical guidance for application of a carbon fiber composite material in bridge engineering.
Description
Technical Field
The invention relates to a construction method of a cable, in particular to a construction method of a carbon fiber cable.
Background
The carbon fiber composite material (CFRP) inhaul cable has the advantages of corrosion resistance, fatigue resistance, light weight, high strength and the like. Carbon fiber inhaul cables have been applied to foreign building and bridge engineering. The strand of the carbon fiber Composite (CFRP) stay cable is usually composed of a plurality of strands, the common nominal diameters are 15mm, 25mm and 35mm, the strand with the very small diameter is composed of single strands, the diameters of the single strands are 5mm, 7mm and the like, and the lengths of the single strands are different from dozens of meters to hundreds of meters. Then, a high-density polyethylene protective sleeve (HDPE) is sleeved outside the carbon fiber strand.
Before the carbon fiber composite (DFRP) cable is widely applied, the problems of poor shearing resistance and low elastic modulus of CFRP should be considered, and the anchoring of the CFRP cable on a bridge tower and a main beam is bound to need special design. The development of a bridge-pulling construction method aiming at the carbon fiber inhaul cable is a key for promoting the popularization and application of the carbon fiber inhaul cable in China.
Disclosure of Invention
The invention aims to provide a construction method of a carbon fiber inhaul cable and popularize the application of a carbon fiber composite material in the field of bridges.
The technical scheme of the invention is as follows: a construction method of a carbon fiber inhaul cable comprises the following steps
(1) Preparing a carbon fiber inhaul cable: twisting a plurality of carbon fiber bundles, winding and shaping the carbon fiber bundles outside a winding belt to form a bare cable, then carrying out hot extrusion on a polyethylene protective layer on the outer layer of the bare cable, then installing anchors at two ends of a cable body, carrying out anchor filling and anchoring, and coiling after tension detection;
(2) traction of the inhaul cable:
(2.1) calculating the traction force of the stay cable, wherein the distance L between the upper end and the lower end, namely the center of the anchor backing plate at the tower end and the center of the anchor backing plate at the beam end is calculated according to the length of the stay cable0And when the traction force is estimated to be T, the distance delta L between the lower end of the inhaul cable and the beam end anchor backing plate is as follows:
ΔL＝L0-L+(ω2LX 2L0)/(24T2)-TL/AE (5)
L0the distance between the centers of the anchor backing plates at the upper end and the lower end is unit m;
omega-unit weight of the guy cable, unit kg/m;
l is the length of the stay cable, unit m;
LX-cable length horizontal projection in units of m;
t-tractive effort, unit KN;
a-cross section area of carbon fiber inhaul cable, unit mm2；
E-modulus of elasticity, MPa;
according to the cable force provided by the bridge design and the related technical parameters of the stay cable before construction: l is0、ω、L、LX、A. E, determining the number of soft traction carbon fiber bundles and the reserved length according to the relation between the traction force T and the traction force delta L when the anchor cup nut just rotates and flattens the end face of the anchor cup when each pair of inhaul cables are tensioned, and referring to experience;
(2.2) cable releasing of a cable:
according to the cable weight, the cable length and the site construction conditions, different construction schemes are adopted for cable laying:
directly hoisting the short cable by using a tower crane, placing the cable to a height above the bridge floor, transversely moving the cable to a construction section, releasing the hook to enable the cable to fall to the bridge floor for a proper length, dragging the cable to the position near an anchor pipe to be installed by using a bridge floor winch, wherein the dragging distance is suitable for meeting the cable hanging requirement; when releasing the cable, the nuts on the anchorage devices at the two ends of the cable are detached, the traction device is installed to prepare for hanging the cable, the cable is directly lifted from the ground to the bridge without a cable releasing disc at the stage, and the cable is statically stopped in the air after leaving the ground to allow the cable to freely rotate to release the torsion;
the long cable adopts a scheme of placing cables on the bridge deck: the cable reel is loaded on the bridge through a bridge deck crane, the cable reel is loaded with a cable releasing frame, the tower end lifts the cable through a tower crane, the cable is directly hung to a bridge tower in the cable releasing process to complete the cable hanging process at the tower end, and the beam end drags the tail of the cable on the bridge deck to be close to a cable guide pipe through a hoist to complete the cable releasing;
(2.3) a pylon suspension cable:
the method comprises the following steps of firstly, when a cable is placed down from a bridge, removing a nut on an anchorage device at the stretching end of the cable, installing a traction device, hanging a bridge tower by the nut, hanging a working surface of a cable guide pipe by an in-tower hoisting machine, installing a protective clamping plate outside a cable body with a proper length away from the stretching end of the cable, placing a traction rope of a tower crane down to be connected with the protective clamping plate, putting the traction rope of the in-tower hoisting machine down from the cable guide pipe, connecting the traction rope with the traction device, synchronously hoisting the tower crane and the in-tower hoisting machine, adjusting the traction speed of the tower crane and the in-tower hoisting machine when the upper end of the cable is close to the pipe orifice of the cable guide pipe, introducing the upper end of the cable into the cable guide pipe by the traction rope of the in-tower hoisting machine until the anchorage device at the end of the cable passes through the cable guide pipe, inserting an annular steel plate after a tool anchor plate of the traction device enters a tower end stretching supporting foot, removing the traction rope in-tower, and installing a soft traction device;
(2.4) hanging ropes at beam ends:
after the upper end of the stay cable is temporarily anchored on a bridge tower, the lower end of the stay cable is lifted by a secondary sling of a tower crane and placed on a trolley, a nylon riding wheel and a carrier roller are placed on the trolley for supporting the stay cable, and the stay cable is directly unfolded by the traction of a winch; installing a half clamp and a winch pulley block at a position several meters behind the tail end of the stay cable, matching a bridge deck crane, drawing a cable body, feeding the tail end of the stay cable into a beam lower cable guide pipe, and screwing an anchor cup nut according to the outward extension of the design requirement after the tail end of the stay cable is downwards exposed out of an anchor plate of an anchor box;
(2.5) temporary anchoring in the Tower
Starting a jack in the bridge tower, stretching the carbon fiber bundle of the traction device back and forth, pulling the upper end of the inhaul cable into the upper anchor backing plate, screwing the anchor cup nut, dismantling the traction device, installing a tension rod and the jack, and waiting for an instruction to perform first stretching;
(3) stretching and drawing
After the guy cable finishes hanging the guy cable, carrying out preparation work before tensioning in the tower, determining a tensioning sequence, starting tensioning, and adjusting the cable force of the guy cable to a bridge design value;
(4) adjusting rope
In order to compensate the stress loss in the construction process or correct the error in the construction process, the bridge deck linearity and the structural internal force of the full bridge can meet the design requirements to the maximum extent.
Preferably, in the earlier stage of rope hanging in the step (2.3), a set of stiffening splint can be additionally arranged outside the protective splint for safety.
Preferably, the traction device in the step (2.3) is composed of a plurality of carbon fiber bundles with the same strength as the inhaul cable, a tool clamping piece, a tool anchor plate, a limiting plate, a soft traction head and a P anchor according to the traction force.
Specifically, the preparation work before the tension in the tower in the step (3) comprises
(1) A traction device used when the hanging cable is removed selects a reducing sleeve matched with the internal thread of the anchor at the end part of the inhaul cable and screws the reducing sleeve into the anchor;
(2) placing and fixing the supporting feet of the jack at proper positions, so that the supporting feet do not need to move when the pull rod and the jack are installed in place, and the centers of the supporting feet and the center of the anchor device should be concentric;
(3) after the pull rod is installed in place, the jack is in place, the jack needs to be light when being put down, the contact surface of the jack and the supporting foot needs to be flat, and the jack needs to be centered;
(4) and the nut is assembled on the anchorage device, and the nut does not need to be screwed too tightly after being assembled so as to provide a room for the jack to move.
Specifically, the tensioning method in the step (3) comprises the following steps:
(1) connecting an oil pump and an oil pipe of the jack, checking whether the precision pressure gauge is consistent with the jack, and before tensioning, moving the two strokes under the condition of no load to ensure that the jack has no problem during tensioning;
(2) starting an oil pump, wherein in the tensioning process, the stay cable slowly rises, and meanwhile, an anchor ring of the stay cable is slowly screwed down to prevent the stay cable from being too high away from the position of the anchor backing plate;
(3) when the design and monitoring of the given tensioning tonnage are achieved, the oil pressure is stabilized, whether the cable force value is correct or not is checked, and then the nut is screwed, so that the nut can be fully combined with the anchor backing plate;
(4) finally, the whole process of oil pressure return, shutdown, power failure and tension is removed.
Specifically, the cable adjustment in the step (4) is carried out for 3 times according to the bridge deck line type condition in the construction:
(1) adjusting cables according to the requirements of a monitoring party according to the linear condition of a main beam in construction;
(2) before folding, adjusting the cable according to the requirement of a monitoring party;
(3) and after the full bridge is closed, adjusting the cable according to the requirements of a proctorial party.
Specifically, the step (4) of adjusting the cable comprises the following steps:
(1) installing a supporting foot, a pull rod and a jack according to the tensioning of the inhaul cable;
(2) adjusting the tensioning tonnage according to the design setting, and adjusting the position of the nut up and down to achieve the required cable force and the bridge deck linearity;
(3) when the cable is adjusted, after the jack, the supporting leg and the tension rod are installed in place, the cable force needs to be increased, and the tension rod of the jack is used for stretching the cable; when the cable force needs to be released, the jack piston is extended out by a certain amount in advance before the cable force is applied, then the tension rod is jacked by the jack, so that the anchoring nut on the anchor device can be just loosened, and after the anchor ring is loosened, the jack is unloaded, and the cable is released out of the opening of the cable guide pipe.
Compared with the prior art, the invention has the advantages that: the invention provides a construction method of a carbon fiber inhaul cable, and provides technical guidance for application of a carbon fiber composite material in bridge engineering.
Drawings
FIG. 1 is a diagram of a computational model of a torque range L according to an embodiment of the present invention;
FIG. 2 is a schematic view of an anchoring structure for an end portion of a carbon fiber cable according to an embodiment of the present invention;
FIG. 3 is an enlarged view of portion A of FIG. 2;
FIG. 4 is a schematic cable unwinding view of a carbon fiber cable coil according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a lanyard of an embodiment of the present invention with a shorter lanyard;
FIG. 6 is a schematic diagram of a hanging cable of a longer pulling cable in an embodiment of the present invention;
FIG. 7 is a schematic structural view of beam-end anchoring in an embodiment of the present invention;
FIG. 8 is a schematic drawing of cable traction tensioning according to an embodiment of the present invention;
in the figure, 1 carbon fiber wire, 2 fixing covers, 3 brakes, 4 cable releasing frames, 5 guys, 6 guide wheels, 7 cable clamps, 8 winch traction ropes, 9 tower cranes, 10 protective clamping plates, 11 tower top winches, 12 anchor heads on guys, 13 middle tower cranes, 14 jacks, 15 tool anchors and 16 carbon fiber wires.
Detailed Description
The present invention will be described in further detail below with reference to the embodiments of the drawings, which are illustrative and intended to be illustrative of the present invention and are not to be construed as limiting the present invention.
The embodiment discloses a manufacturing method of a carbon fiber inhaul cable, which is used for manufacturing the carbon fiber inhaul cable by using carbon fiber wires with the specification of 7mm and is applied to bridge engineering.
The preparation method of the carbon fiber inhaul cable comprises the following steps:
1. twisting:
as shown in fig. 1, a plurality of carbon fiber filaments are prepared and bundled in parallel, all the carbon fiber filaments are twisted in a rotating mode, the twisting angle is 2-4 degrees, then a wrapping belt is integrally wrapped and shaped, the wrapping direction of the wrapping belt is opposite to the twisting direction, so that a bare cable is obtained, and a torque range L is calculated according to the circumference C and the twisting angle alpha of a circle where the center of the carbon fiber filament at the outermost layer of the bare cable is located, wherein the L is C/tan alpha.
When a plurality of carbon fiber yarns are prepared, one of the carbon fiber yarns is used as a standard yarn, and the other carbon fiber yarns are prepared according to the standard yarn. Compared with a parallel steel wire inhaul cable, the carbon fiber inhaul cable needs to consider the influence of stress, temperature and sag on the length of the standard wire in the manufacturing process, and the length of the standard wire is corrected through the following formula
L＝L0×[(1+F/EA)+α(T-20)]+(1+8×n2/3-32×n4/5)×L0 (3)
In formula (3): l: length under wire stress, in m;
L0: stress-free design length, unit m;
f: tension, in units of N;
e: the elastic modulus of the carbon fiber is measured value in MPa;
a: the cross-sectional area of the carbon fiber, the measured value of the manufactured standard yarn, in m2；
α: coefficient of linear expansion of carbon fiber;
t: ambient temperature, in units;
g: the unit meter weight of the carbon fiber is g/m;
n: vector-span ratio, n ═ G × L0/8/F。
The thermal expansion coefficient of the carbon fiber ribs is only one order 1/20 of that of the steel wires, and the weight of the steel wires is 1/5; through the comparison and calculation of the formula, the precision of the steel wire and the carbon fiber wire with the same length can be improved by more than 10 times.
2. Extrusion molding:
extruding a double-layer polyethylene protective layer outside the bare cable of the inhaul cable, wherein the density of the polyethylene protective layer meets 0.940-0.965 g/cm3The environmental stress cracking resistance is more than or equal to 5000 hours, and the melt index is less than or equal to 0.45g/10 min.
The method comprises the following specific operations: the die orifice and the extrusion speed of the plastic extruding machine are set according to the outer diameter of the inhaul cable and the thickness requirement of the two polyethylene protective layers before extrusion molding, the die orifice is provided with two polyethylene extrusion channels, and the naked cable is covered by the double-layer polyethylene plastic in the extrusion process.
3. Blanking:
determining a blanking position point of the stay cable through measurement of the steel tape, cutting off the cable body by using a cutting machine after a polyethylene protective layer is partially stripped, keeping the cutting end surface of the stay cable vertical to the axis of the stay cable during cutting, and stripping a polyethylene sheath according to a set length to form a wrapping belt;
4. grouting an anchor:
the anchor is a main connecting structure for transmitting the cable force of the stay cable to the tower and the beam, the anchor is subjected to corrosion resistance by hot galvanizing or paint coating, the thickness of the hot galvanizing is not less than 90 mu m, and the thickness of the paint coating is determined according to the steel structure specification and the design requirement.
The anchor irrigation operation is as follows
a, fixing the end part of the carbon fiber wire after stripping and an anchor cup on an anchor filling platform, and cleaning the inner wall of the anchor cup;
b, uniformly dispersing the carbon fiber wires according to the hole positions of the wire dividing plate, wherein the carbon fiber wires penetrate through the holes in the wire dividing plate in a one-to-one correspondence mode, the end parts of the carbon fiber wires extend out of the wire dividing plate by about 30-50 mm, in order to prevent the relative position between the carbon fiber wires and the anchorage device from changing when the anchorage device is filled, fixing covers are bonded to the end parts of the exposed carbon fiber wires, and the carbon fiber wires are clamped on the outer side of the wire dividing plate through the fixing covers;
c, filling the uniformly stirred filler into the anchor cup;
d, heating and curing after the anchor filling is finished.
5. Tensioning:
the carbon fiber cable after the anchor carries out the stretch-draw and detects, the design cable force of 1.2 ~ 1.4 times is got to the super tension force of cable, and stretch-draw completion requires that the casting retraction value in the anchor cup is no more than 6mm, and the post-tensioning uninstallation of tension force to 20% super tension force or bridge cable force, carries out the length measurement to the cable under this condition and detects, and the length measurement should be gone on under constant temperature, the light-resistant condition, and the unstressed length calculation formula under the cable benchmark temperature is as follows:
in the formula (2), LC0The unstressed length of the stay cable at the reference temperature is in m;
LCPthe length of the stay cable subjected to the tension force P20 is m;
P20-20% of the over-tension force in units of N;
a is the nominal cross section area of the cable carbon fiber tows, and the unit is mm2；
E-modulus of elasticity of carbon fiber filaments in MPa;
alpha-linear expansion coefficient, 0.6X 10-6/℃；
t is the stable and uniform temperature of the stay cable during length measurement, and the unit is;
t0-designing a reference temperature, determined by design, in units;
1/5 which is only about the same diameter steel wire because the unit weight of the carbon fiber wire is only 64 g/m; coefficient of linear expansion of 0.6X 10-6/° c, about 1/20 for a steel wire of the same diameter only.
According to the standard yarn manufacturing, the loading force is 50kg, the distance between the supporting wheels is 5mm, the environment temperature is 10 ℃, the length of the standard yarn is 100m, the reference temperature is 20 ℃, and the temperature and the sag correction of the carbon fiber yarn and the steel wire are calculated according to the temperature and the sag correction respectively as follows
| Length error caused by temperature | Length error caused by sag | Two term error synthesis | |
| 7mm steel wire | -30.0mm | 9.5mm | -20.5mm |
| 7mm carbon fiber yarn | -1.5mm | 0.4mm | -1.1mm |
Therefore, under the above test conditions, the length error of the carbon fiber wire is about 1/20 of the steel wire, so that the manufactured standard wire has higher precision, and the length precision measured during stretching measurement is higher.
6. Coiling:
the stay cable is coiled in a form of tire removal or a steel disc, the outer surface of the stay cable is packaged before coiling, and then coiling and coiling are carried out layer by layer, wherein the coiling inner diameter is required to be 35-50 times of the outer diameter of the stay cable, and the coiling inner diameter is not less than 1.8 m.
The embodiment further discloses a construction method of using the carbon fiber inhaul cable as the inhaul cable:
different from a parallel steel wire inhaul cable, the site construction method of the carbon fiber inhaul cable is obviously different. The installation weight of the tower end of the parallel steel wire inhaul cable is large and is often larger than the hoisting limit of an on-site tower crane, a special hanging bracket needs to be designed on the top of the tower, and the construction difficulty, cost and safety risk are large. The same carbon fiber inhaul cable, the tower end large-tonnage hoisting weight can be satisfied only by 20 percent of that of the parallel steel wire inhaul cable, and the common tower crane can meet the requirement. In addition, the carbon fiber inhaul cable anchorage device is longer, the force of the carbon fiber inhaul cable is reduced when the carbon fiber inhaul cable is used, and the carbon fiber inhaul cable anchorage device is convenient to install. Because carbon fiber cable unit weight is light, can show the reduction traction force.
The present embodiment describes a construction method of a carbon fiber cable.
(1) The preparation method of the carbon fiber inhaul cable refers to the following steps.
(1.1), twisting:
as shown in fig. 1, a plurality of carbon fiber filaments are prepared and bundled in parallel, all the carbon fiber filaments are twisted in a rotating mode, the twisting angle is 2-4 degrees, then a wrapping belt is integrally wrapped and shaped, the wrapping direction of the wrapping belt is opposite to the twisting direction, so that a bare cable is obtained, and a torque range L is calculated according to the circumference C and the twisting angle alpha of a circle where the center of the carbon fiber filament at the outermost layer of the bare cable is located, wherein the L is C/tan alpha.
When a plurality of carbon fiber yarns are prepared, one of the carbon fiber yarns is used as a standard yarn, and the other carbon fiber yarns are prepared according to the standard yarn. Compared with a parallel steel wire inhaul cable, the carbon fiber inhaul cable needs to consider the influence of stress, temperature and sag on the length of the standard wire in the manufacturing process, and the length of the standard wire is corrected through the following formula
L＝L0×[(1+F/EA)+α(T-20)]+(1+8×n2/3-32×n4/5)×L0 (3)
In formula (4): l: length under wire stress, in m;
L0: stress-free design length, unit m;
f: tension, in units of N;
e: the elastic modulus of the carbon fiber is measured value in MPa for manufacturing standard yarn;
a: the cross section of the carbon fiber, the measured value of the standard yarn, unit m2；
α: coefficient of linear expansion of carbon fiber;
t: ambient temperature, in units;
g: the unit meter weight of the carbon fiber is g/m;
n: vector-span ratio, n ═ G × L0/8/F。
The thermal expansion coefficient of the carbon fiber ribs is only one order 1/20 of that of the steel wires, and the weight of the steel wires is 1/5; through the comparison and calculation of the formula, the precision of the steel wire and the carbon fiber wire with the same length can be improved by more than 10 times.
(1.2), extrusion:
extruding a double-layer polyethylene protective layer outside the bare cable of the inhaul cable, wherein the density of the polyethylene protective layer meets 0.940-0.965 g/cm3The environmental stress cracking resistance is more than or equal to 5000 hours, and the melt index is less than or equal to 0.45g/10 min.
The method comprises the following specific operations: the die orifice and the extrusion speed of the plastic extruding machine are set according to the outer diameter of the inhaul cable and the thickness requirement of the two polyethylene protective layers before extrusion molding, the die orifice is provided with two polyethylene extrusion channels, and the naked cable is covered by the double-layer polyethylene plastic in the extrusion process.
(1.3) blanking:
determining a blanking position point of the stay cable through measurement of the steel tape, cutting off the cable body by using a cutting machine after a polyethylene protective layer is partially stripped, keeping the cutting end surface of the stay cable vertical to the axis of the stay cable during cutting, and stripping a polyethylene sheath according to a set length to form a wrapping belt;
(1.4) grouting anchor:
the anchor is a main connecting structure for transmitting the cable force of the stay cable to the tower and the beam, the anchor is subjected to corrosion resistance by hot galvanizing or paint coating, the thickness of the hot galvanizing is not less than 90 mu m, and the thickness of the paint coating is determined according to the steel structure specification and the design requirement.
The anchor irrigation operation is as follows
a, fixing the end part of the carbon fiber wire after stripping and an anchor cup on an anchor filling platform, and cleaning the inner wall of the anchor cup;
b, uniformly dispersing the carbon fiber wires according to the hole positions of the wire dividing plate, wherein the carbon fiber wires penetrate through the holes in the wire dividing plate in a one-to-one correspondence mode, the end parts of the carbon fiber wires extend out of the wire dividing plate by about 30-50 mm, in order to prevent the relative position between the carbon fiber wires and the anchorage device from changing when the anchorage device is filled, fixing covers are bonded to the end parts of the exposed carbon fiber wires, and the carbon fiber wires are clamped on the outer side of the wire dividing plate through the fixing covers;
c, filling the uniformly stirred filler into the anchor cup;
d, heating and curing after the anchor filling is finished.
(1.5) tensioning:
the carbon fiber cable after the anchor carries out the stretch-draw and detects, the design cable force of 1.2 ~ 1.4 times is got to the super tension force of cable, and stretch-draw completion requires that the casting retraction value in the anchor cup is no more than 6mm, and the post-tensioning uninstallation of tension force to 20% super tension force or bridge cable force, carries out the length measurement to the cable under this condition and detects, and the length measurement should be gone on under constant temperature, the light-resistant condition, and the unstressed length calculation formula under the cable benchmark temperature is as follows:
in the formula (2), LC0The unstressed length of the stay cable at the reference temperature is in m;
LCPthe length of the stay cable subjected to the tension force P20 is m;
P20-20% of the over-tension force in units of N;
a is the nominal cross section area of the cable carbon fiber tows, and the unit is mm2；
E-modulus of elasticity of carbon fiber filaments in MPa;
alpha-linear expansion coefficient, 0.6X 10-6/℃；
t is the stable and uniform temperature of the stay cable during length measurement, and the unit is;
t0-designing a reference temperature, determined by design, in units;
1/5 which is only about the same diameter steel wire because the unit weight of the carbon fiber wire is only 64 g/m; coefficient of linear expansion of 0.6X 10-6/° c, about 1/20 for a steel wire of the same diameter only.
The loading force is 50kg when the standard wire is manufactured, the distance between the supporting wheels is 5mm, the assumed ambient temperature is 10 ℃, the length of the standard wire is 100m, the reference temperature is 20 ℃, and the temperature and sag correction of the carbon fiber wire and the steel wire are calculated according to the temperature and sag correction respectively as follows
| Length error caused by temperature | Length error caused by sag | Two term error synthesis | |
| 7mm steel wire | -30.0mm | 9.5mm | -20.5mm |
| 7mm carbon fiber yarn | -1.5mm | 0.4mm | -1.1mm |
Therefore, under the above test conditions, the length error of the carbon fiber wire is about 1/20 of the steel wire, so that the manufactured standard wire has higher precision, and the length precision measured during stretching measurement is higher.
(1.6), coiling:
the stay cable is coiled in a form of tire removal or a steel disc, the outer surface of the stay cable is packaged before coiling, and then coiling and coiling are carried out layer by layer, wherein the coiling inner diameter is required to be 35-50 times of the outer diameter of the stay cable, and the coiling inner diameter is not less than 1.8 m.
(2) Traction of the inhaul cable:
(2.1) calculating the traction force of the stay cable, wherein the distance L between the upper end and the lower end, namely the center of the anchor backing plate at the tower end and the center of the anchor backing plate at the beam end is calculated according to the length of the stay cable0And when the traction force is estimated to be T, the distance delta L between the lower end of the inhaul cable and the beam end anchor backing plate is as follows:
ΔL＝L0-L+(ω2LX 2L0)/(24T2)-TL/AE (1)
L0the distance between the centers of the anchor backing plates at the upper end and the lower end is unit m;
omega-unit weight of the guy cable, unit kg/m;
l is the length of the stay cable, unit m;
LX-cable length horizontal projection in units of m;
t-tractive effort, unit KN;
a-cross section area of carbon fiber inhaul cable, unit mm2；
E-modulus of elasticity, MPa;
according to the cable force provided by the bridge design and the related technical parameters of the stay cable before construction: l is0、ω、L、LX、A. E, determining the number of soft traction carbon fiber bundles and the reserved length according to the relation between the traction force T and the traction force delta L when the anchor cup nut just rotates and levels the end face of the anchor cup when each pair of inhaul cables are tensioned, and determining according to an empirical value and an empirical card;
(2.2) cable releasing of a cable:
the cable can adopt different construction schemes according to different construction stages:
directly hoisting the short cable by using a tower crane, placing the cable to a height above the bridge floor, transversely moving the cable to a construction section, releasing the hook to enable the cable to fall to the bridge floor for a proper length, dragging the cable to the position near an anchor pipe to be installed by using a bridge floor winch, wherein the dragging distance is suitable for meeting the cable hanging requirement; when releasing the cable, the nuts on the anchorage devices at the two ends of the cable are detached, the traction device is installed to prepare for hanging the cable, the cable is directly lifted from the ground to the bridge without a cable releasing disc at the stage, and the cable is statically stopped in the air after leaving the ground to allow the cable to freely rotate to release the torsion;
the long cable adopts a scheme of placing cables on the bridge deck: the guy cable is coiled to be loaded on a bridge through a bridge deck crane, a cable releasing frame is arranged on the coil, the guy cable is lifted by the tower end through a tower crane, the guy cable is directly hung to a bridge tower in the cable releasing process to complete the cable hanging process of the tower end, and the tail of the guy cable on the bridge deck is dragged to be close to a cable guide pipe by the beam end through a winch to complete the whole cable releasing process, which is shown in figure 4.
(2.3) a pylon suspension cable:
the method comprises the steps of firstly, when a cable is placed down from a bridge, removing a nut on an anchorage device at the tensioning end of the cable, installing a traction device, hanging a bridge tower by the nut, hanging the bridge tower into a working surface of a cable feeding guide pipe by an in-tower hoisting machine, installing a protective clamping plate (cable clamp) outside a cable body with a proper length away from the tensioning end of the cable, lowering a traction rope of the tower crane to be connected with the protective clamping plate (cable clamp), lowering the traction rope of the in-tower hoisting machine from the cable guide pipe to be connected with the traction device at the tensioning end, synchronously carrying out tower hoisting and traction of the in-tower hoisting machine, inserting an annular steel plate after a tool anchor plate of the traction device enters a tensioning support foot at the tower end, removing the traction rope in the tower, and installing a soft traction device.
In the earlier stage of cable hanging, a set of stiffening splint can be additionally arranged on the outer side of the protective splint (cable clamp) for safety.
The traction device consists of a plurality of carbon fiber bundles with the same strength as the inhaul cable, a tool clamping piece, a tool anchor plate, a limiting plate, a soft traction head and a P anchor according to the traction force. Or the light and short guy cable can be directly pulled by the extension pull rod, as shown in fig. 5, and the ultra-long guy cable can be pulled by the middle tower crane matched with the suspension cable, as shown in fig. 6.
The concrete operation of the tower end hanging rope is as follows:
i, hoisting a looped binding cable on a cable placing disc by a hoisting tower, unfastening the binding cable, drawing out a cable anchor head, and installing a soft traction system; the tower top hoist traction rope is guided through the tower and is guided and released to the bridge floor through the jack, the supporting feet, the anchor cup nut and the upper rope guide pipe to be connected with the soft traction system.
And II, installing a half clamp and a nylon hanging strip (namely a cable clamp) at a position which is a certain distance away from an anchor head on the stay cable, hoisting the nylon hanging strip by the tower top hanger, commanding the tower top hanger to slowly rise, synchronously winding the rope by a winch in the tower, simultaneously rotating a rope releasing disc to release the rope, and performing rope hanging construction.
And III, pulling a soft traction head part into the rear part of a tensioning jack in the tower by a hoisting machine in the tower, installing a soft traction tensioning system, and pulling one end of the stay rope for temporary anchoring. The length allowance of the lower part of the stay cable is increased so as to meet the requirement of the stay cable anchoring installation of the main and side span beam ends.
And IV, removing the hanging strip of the tower top hanging bracket, and completing the hanging of the cable.
(2.4) hanging ropes at beam ends:
after the upper end of the stay cable is temporarily anchored on a bridge tower, the lower end of the stay cable is lifted by a secondary sling of a tower crane and placed on a trolley, a nylon riding wheel and a carrier roller are placed on the trolley for supporting the stay cable, and the stay cable is directly unfolded by the traction of a winch; and installing a half clamp and a winch pulley block at a position several meters behind the tail end of the stay cable, matching a bridge surface crane, drawing a cable body, feeding the tail end of the stay cable into a beam lower cable guide pipe, and screwing an anchor cup nut according to the outward extension of the design requirement after the tail end of the stay cable is downwards exposed out of an anchor plate of the anchor box, as shown in figure 7.
(2.5) temporary anchoring in the Tower
Starting a jack in the bridge tower, stretching the carbon fiber bundle of the traction device back and forth, pulling the upper end of the inhaul cable into the upper anchor backing plate, screwing the anchor cup nut, detaching the traction device, installing a tension rod and the jack, and waiting for an instruction to perform first stretching, and referring to fig. 8;
(3) stretching and drawing
After the guy cable finishes hanging the guy cable, the preparation work before the guy cable is stretched in the tower is carried out, and the preparation work comprises
(1) A traction device used when the hanging cable is removed selects a reducing sleeve matched with the internal thread of the anchor at the end part of the inhaul cable and screws the reducing sleeve into the anchor; it should be noted that all threads of the reducing sleeve must be screwed into the bottom of the internal thread of the anchor head, and the redundant thread part should be left outside.
(2) The supporting feet of the jack are placed at proper positions and fixed, so that the pull rod and the jack do not need to move when being installed in place, the centers of the supporting feet and the center of the anchor device are concentric, and the phenomenon of eccentricity is avoided, so that the external threads of the anchor device are prevented from being damaged by pulling in the later tensioning process;
(3) after the pull rod is installed in place, the jack is in place, the jack needs to be light when being put down, the contact surface of the jack and the supporting foot needs to be flat, and the jack needs to be centered;
(4) and the nut is assembled on the anchorage device, and the nut does not need to be screwed too tightly after being assembled so as to provide a room for the jack to move. The distance between the jack and the anchor is 1-2cm, so that the center positions of the jack, the supporting foot and the anchor are favorably adjusted. Meanwhile, the oil supply of the jack is facilitated.
Determining a tensioning sequence according to the monitoring instruction, starting tensioning, and adjusting the cable force of the inhaul cable to a design value of the bridge, wherein the tensioning method comprises the following steps:
(1) connecting an oil pump and an oil pipe of the jack, checking whether the precision pressure gauge is consistent with the jack, and before tensioning, moving the two strokes under the condition of no load to ensure that the jack has no problem during tensioning;
(2) starting an oil pump, wherein in the tensioning process, the stay cable slowly rises, and meanwhile, an anchor ring of the stay cable is slowly screwed down to prevent the stay cable from being too high away from the position of the anchor backing plate;
(3) when the design and monitoring of the given tensioning tonnage are achieved, the oil pressure is stabilized, whether the cable force value is correct or not is checked, and then the nut is screwed, so that the nut can be fully combined with the anchor backing plate;
(4) finally, the whole process of oil pressure return, shutdown, power failure and tension is removed.
(4) Adjusting rope
In order to compensate the stress loss in the construction process or correct the error in the construction process, the bridge deck linearity and the structural internal force of the full bridge can meet the design requirements to the maximum extent. The cable adjustment can be roughly carried out for 3 times according to the bridge surface line type condition in the construction:
(1) and adjusting the cable according to the requirement of a monitoring party according to the linear condition of the main beam in construction.
(2) Before closing, cable adjustment is carried out according to the requirements of a monitoring party.
(3) And after the full bridge is closed, adjusting the cable according to the requirements of a proctorial party.
B. Step of adjusting cable
(1) The installation of the supporting feet, the installation of the pull rod and the positioning of the jack are the same as the tensioning step.
(2) The tensioning tonnage is adjusted according to the design, and the position of the nut is adjusted up and down to achieve the required cable force and the bridge deck linearity.
(3) When the cable is adjusted, after the jack, the supporting leg and the tension rod are installed in place, the cable force needs to be increased, and the tension rod of the jack is used for stretching the cable; when the cable force needs to be released, the jack piston is enabled to extend out a certain amount in advance before the cable force is applied, then the jack is used for jacking the tension rod, so that the anchoring nut on the anchor head can be just loosened, and after the anchor ring is loosened, the jack is enabled to unload, and the cable is released out of the cable pipe opening. C. Attention points to adjust the search
The cable adjustment requires 'uniform, symmetrical, graded and circular' construction, and generally adopts three control targets:
firstly, controlling cable force;
controlling deflection;
cable force and deflection are controlled.
After cable adjustment, the bridge deck is smooth in line type and uniform in cable force, the beam structure can be in a better working state, creep and nonlinear influence is basically eliminated, and the cable force, the main beam stress and the cable tower stress are in a safe working range.
And detecting the cable force by adopting an electronic frequency vibration meter on site.
Although preferred embodiments of the present invention have been described in detail hereinabove, it should be clearly understood that modifications and variations of the present invention are possible to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A construction method of a carbon fiber inhaul cable is characterized by comprising the following steps: comprises the steps of
(1) Preparing a carbon fiber inhaul cable: twisting a plurality of carbon fiber bundles, winding and shaping the carbon fiber bundles outside a winding belt to form a bare cable, then carrying out hot extrusion on a polyethylene protective layer on the outer layer of the bare cable, then installing anchors at two ends of a cable body, carrying out anchor filling and anchoring, and coiling after tension detection;
(2) traction of the inhaul cable:
(2.1) calculating the traction force of the stay cable, wherein the distance L between the upper end and the lower end, namely the center of the anchor backing plate at the tower end and the center of the anchor backing plate at the beam end is calculated according to the length of the stay cable0And when the traction force is estimated to be T, the distance delta L between the lower end of the inhaul cable and the beam end anchor backing plate is as follows:
ΔL＝L0-L+(ω2LX 2L0)/(24T2)-TL/AE (5)
L0the distance between the centers of the anchor backing plates at the upper end and the lower end is unit m;
omega-unit weight of the guy cable, unit kg/m;
l is the length of the stay cable, unit m;
LX-cable length horizontal projection in units of m;
t-tractive effort, unit KN;
a-cross section area of carbon fiber inhaul cable, unit mm2；
E-modulus of elasticity, MPa;
according to the cable force provided by the bridge design and the related technical parameters of the stay cable before construction: l is0、ω、L、LXA, E, determining the number and the reserved length of the soft traction carbon fiber bundles according to the relationship between the traction force T and the traction force Delta L when the anchor cup nut just rotates and flattens the end face of the anchor cup when each pair of stay cables are tensionedDegree;
(2.2) cable releasing of a cable:
according to the cable weight, the cable length and the site construction conditions, different construction schemes are adopted for cable laying:
directly hoisting the short cable by using a tower crane, placing the cable to a height above the bridge floor, transversely moving the cable to a construction section, releasing the hook to enable the cable to fall to the bridge floor for a proper length, dragging the cable to the position near an anchor pipe to be installed by using a bridge floor winch, wherein the dragging distance is suitable for meeting the cable hanging requirement; when releasing the cable, the nuts on the anchorage devices at the two ends of the cable are detached, the traction device is installed to prepare for hanging the cable, the cable is directly lifted from the ground to the bridge without a cable releasing disc at the stage, and the cable is statically stopped in the air after leaving the ground to allow the cable to freely rotate to release the torsion;
the long cable adopts a scheme of placing cables on the bridge deck: the cable reel is loaded on the bridge through a bridge deck crane, the cable reel is loaded with a cable releasing frame, the tower end lifts the cable through a tower crane, the cable is directly hung to a bridge tower in the cable releasing process to complete the cable hanging process at the tower end, and the beam end drags the tail of the cable on the bridge deck to be close to a cable guide pipe through a hoist to complete the cable releasing;
(2.3) a pylon suspension cable:
the method comprises the following steps of firstly, when a cable is placed down from a bridge, removing a nut on an anchorage device at the stretching end of the cable, installing a traction device, hanging a bridge tower by the nut, hanging a working surface of a cable guide pipe by an in-tower hoisting machine, installing a protective clamping plate outside a cable body with a proper length away from the stretching end of the cable, placing a traction rope of a tower crane down to be connected with the protective clamping plate, putting the traction rope of the in-tower hoisting machine down from the cable guide pipe, connecting the traction rope with the traction device, synchronously hoisting the tower crane and the in-tower hoisting machine, adjusting the traction speed of the tower crane and the in-tower hoisting machine when the upper end of the cable is close to the pipe orifice of the cable guide pipe, introducing the upper end of the cable into the cable guide pipe by the traction rope of the in-tower hoisting machine until the anchorage device at the end of the cable passes through the cable guide pipe, inserting an annular steel plate after a tool anchor plate of the traction device enters a tower end stretching supporting foot, removing the traction rope in-tower, and installing a soft traction device;
(2.4) hanging ropes at beam ends:
after the upper end of the stay cable is temporarily anchored on a bridge tower, the lower end of the stay cable is lifted by a secondary sling of a tower crane and placed on a trolley, a nylon riding wheel and a carrier roller are placed on the trolley for supporting the stay cable, and the stay cable is directly unfolded by the traction of a winch; installing a half clamp and a winch pulley block at a position several meters behind the tail end of the stay cable, matching a bridge deck crane, drawing a cable body, feeding the tail end of the stay cable into a beam lower cable guide pipe, and screwing an anchor cup nut according to the outward extension of the design requirement after the tail end of the stay cable is downwards exposed out of an anchor plate of an anchor box;
(2.5) temporary anchoring in the Tower
Starting a jack in the bridge tower, stretching the carbon fiber bundle of the traction device back and forth, pulling the upper end of the inhaul cable into the upper anchor backing plate, screwing the anchor cup nut, dismantling the traction device, installing a tension rod and the jack, and waiting for an instruction to perform first stretching;
(3) stretching and drawing
After the guy cable finishes hanging the guy cable, carrying out preparation work before tensioning in the tower, determining a tensioning sequence, starting tensioning, and adjusting the cable force of the guy cable to a bridge design value;
(4) adjusting rope
In order to compensate the stress loss in the construction process or correct the error in the construction process, the bridge deck linearity and the structural internal force of the full bridge can meet the design requirements to the maximum extent.
2. The construction method of a carbon fiber cable according to claim 1, characterized in that: and (2.3) in the earlier stage of rope hanging, a set of stiffening splint can be additionally arranged on the outer side of the protective splint for safety.
3. The construction method of a carbon fiber cable according to claim 1, characterized in that: and (4) the traction device in the step (2.3) consists of a plurality of carbon fiber bundles with the same strength as the inhaul cable, a tool clamping piece, a tool anchor plate, a limiting plate, a soft traction head and a P anchor according to the traction force.
4. The construction method of a carbon fiber cable according to claim 1, characterized in that: step (3) preparation work before tension in the tower comprises
(1) A traction device used when the hanging cable is removed selects a reducing sleeve matched with the internal thread of the anchor at the end part of the inhaul cable and screws the reducing sleeve into the anchor;
(2) placing and fixing the supporting feet of the jack at proper positions, so that the supporting feet do not need to move when the pull rod and the jack are installed in place, and the centers of the supporting feet and the center of the anchor device should be concentric;
(3) after the pull rod is installed in place, the jack is in place, the jack needs to be light when being put down, the contact surface of the jack and the supporting foot needs to be flat, and the jack needs to be centered;
(4) and the nut is assembled on the anchorage device, and the nut does not need to be screwed too tightly after being assembled so as to provide a room for the jack to move.
5. The construction method of a carbon fiber cable according to claim 1, characterized in that: step (3) the tensioning method comprises the following steps:
(1) connecting an oil pump and an oil pipe of the jack, checking whether the precision pressure gauge is consistent with the jack, and before tensioning, moving the two strokes under the condition of no load to ensure that the jack has no problem during tensioning;
(2) starting an oil pump, wherein in the tensioning process, the stay cable slowly rises, and meanwhile, an anchor ring of the stay cable is slowly screwed down to prevent the stay cable from being too high away from the position of the anchor backing plate;
(3) when the design and monitoring of the given tensioning tonnage are achieved, the oil pressure is stabilized, whether the cable force value is correct or not is checked, and then the nut is screwed, so that the nut can be fully combined with the anchor backing plate;
(4) finally, the whole process of oil pressure return, shutdown, power failure and tension is removed.
6. The construction method of a carbon fiber cable according to claim 1, characterized in that: and (4) adjusting the cable according to the bridge surface line type condition in the construction for 3 times:
(1) adjusting cables according to the requirements of a monitoring party according to the linear condition of a main beam in construction;
(2) before folding, adjusting the cable according to the requirement of a monitoring party;
(3) and after the full bridge is closed, adjusting the cable according to the requirements of a proctorial party.
7. The construction method of a carbon fiber cable according to claim 1, characterized in that: step (4), cable adjusting:
(1) installing a supporting foot, a pull rod and a jack according to the tensioning of the inhaul cable;
(2) adjusting the tensioning tonnage according to the design setting, and adjusting the position of the nut up and down to achieve the required cable force and the bridge deck linearity;
(3) when the cable is adjusted, after the jack, the supporting leg and the tension rod are installed in place, the cable force needs to be increased, and the tension rod of the jack is used for stretching the cable; when the cable force needs to be released, the jack piston is extended out by a certain amount in advance before the cable force is applied, then the tension rod is jacked by the jack, so that the anchoring nut on the anchor device can be just loosened, and after the anchor ring is loosened, the jack is unloaded, and the cable is released out of the opening of the cable guide pipe.
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| CN114592695A (en) * | 2022-03-16 | 2022-06-07 | 威胜利工程有限公司 | Method for installing anchorage at upper end of steel strand bundle |
| CN114737472A (en) * | 2022-05-24 | 2022-07-12 | 中铁二院工程集团有限责任公司 | Damping limiting inhaul cable device, bridge damping system and carbon fiber cable design method |
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| CN113585629A (en) * | 2021-07-20 | 2021-11-02 | 重庆达力索缆科技有限公司 | Carbon fiber inhaul cable and inhaul cable system |
| CN113802455B (en) * | 2021-08-31 | 2022-06-28 | 北京科技大学 | Anchor device for carbon fiber parallel inhaul cable and anchoring method thereof |
| CN115142728B (en) * | 2022-07-27 | 2023-06-27 | 浙江精工钢结构集团有限公司 | Installation method of prestressed cable tower tip structure |
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