CN107201721B - A kind of suspension cable construction method of installation - Google Patents
A kind of suspension cable construction method of installation Download PDFInfo
- Publication number
- CN107201721B CN107201721B CN201610147566.6A CN201610147566A CN107201721B CN 107201721 B CN107201721 B CN 107201721B CN 201610147566 A CN201610147566 A CN 201610147566A CN 107201721 B CN107201721 B CN 107201721B
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- cable
- anchor
- anchor cup
- rope
- suspension
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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
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/12—Mounting of reinforcing inserts; Prestressing
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
A kind of suspension cable construction method of installation, including：Suspension cable installation preparation, suspension cable transport and lifting Shang Qiao, tower end are installed, beam face exhibition rope, beam-ends are drawn, the tensioning step of suspension cable, and having installation, simply installation accuracy is high, the small advantageous effects of error range.
Description
Technical field
The present invention relates to a kind of suspension cable construction methods of installation, and more specifically, a kind of suspension cable for cable-stayed bridge is installed
Construction method.
Background technology
Cable-stayed bridge is also known as Cable stayed bridge, is a kind of bridge being directly pulled in girder with many drag-lines on bridge tower, is by pressure-bearing
Tower, tension rope and hold a kind of structural system that curved beam body combines.It is considered as the multispan that drag-line replaces buttress
Elastic support continuous beam.It can be such that moment of flexure in beam body reduces, and reduce building height, alleviate construction weight, save material.Tiltedly
Bridge is drawn mainly to be made of Sarasota, girder, suspension cable.
Cable-stayed bridge using many suspension cables stretched out from bridge tower as the elastic support points of beam, as continuous beam on many supports that
Sample works, and so that span is substantially reduced, can greatly reduce the moment of flexure of beam in this way.Suspension cable only exists to the resilient support effect of beam
When drag-line is in tensioning state always, can just it be fully played, therefore must be to the pre- tensioning of Suo Jinhang before load-bearing.Generally
In fact, the support of suspension cable is most effective to dead load, takes second place to car load, worst to wind load.And for long-span bridges
Dead load internal force accounts for the largest percentage, and dead load moment of flexure is small, and main beam section can be smaller, weight reduction, to increase bridge
Span ability.Current stay cable of cable-stayed bridge tensioning is complicated in the prevalence of installation, and installation accuracy is not high, and error is larger to ask
Topic.
Invention content
The present invention provides a kind of suspension cable construction method of installation, this method has installation simple, and installation accuracy is high, error
The small advantageous effects of range.
In order to realize the purpose of the application, the application the technical solution adopted is that：
1. a kind of suspension cable construction method of installation, includes the following steps：
1, suspension cable installation prepares
1.1, the inspection of finished product rope
Design requirement is pressed before suspension cable manufacture, is tested to the related performance of suspension cable, after suspension cable reaches scene, to oblique
Drag-line is inspected for acceptance, building site of being allowed for access after passed examination；
1.2, built-in fitting is set
Before the areas king-tower You Suo construct, the related embedded part structure figure of suspension cable installation and built-in fitting layout drawing are provided,
Built-in fitting carried out during Construction of Pylon it is pre-buried, suspension cable installation built-in fitting be mainly turn in tower and tensioning equipment fix it is pre-
Service hoisting frame built-in fitting, tower top are pre-buried into people hole 50KN hoist engines fixation built-in fitting, tower top on embedded part, king-post middle cross beam
Part；
1.3, cable guide pipe inspection
Suspension cable anchor cup outer diameter differs very little with the internal diameter of cable guide pipe, easily generation position deviation when hanging cable, to cause
The damage of anchor cup male thread and suspension cable PE protective cases, thus suspension cable hang before the cable guide pipe of tower, beam-ends should be carried out it is comprehensive
Inspection, polishing is tied to welding slag, the burr etc. in cable guide pipe, should be repaired in time when suspension cable has crimp；
2, suspension cable transport and the upper bridge of lifting
Cable body lower end should additionally arrange wood lump supporting pad when suspension cable is stored, and between the lumps of wood and cable body plus it is certain thickness it is soft every
From object, suspension cable is not allowed directly to be contacted with beam face or ground, forbids that there are burning things which may cause a fire disaster around cable body in 10 meters, it such as really need to be in cable body
Surrounding welding, gas cutting must carry out safety to related personnel before operation and tell somebody what one's real intentions are, and be equipped with extinguishing device simultaneously；
3 suspension centres are set when being lifted by crane at disk suspension cable, using dedicated hanging belt, are forbidden with the direct pocket of steel wire rope in suspension cable
On, to avoid damage PE sheaths and clashing and breaking anchor head screw thread, if finding, anchor head screw thread has microlesion that should modify in time, PE shields
The indentation and local damage of the ㎜ depths of appearance >=3 are put on, specific purpose tool material identical with PE sheaths should be used to impaired place's progress
It repairs, this process should have been handled before hanging cable；
3, tower end is installed
The cable body being placed on 200KN cable trays with tower crane pulls out 8m length and is placed on Liang Mianshang, after suspension cable anchor cup
End installation towing plate, tower top 50KN steel wire rope of windlass are put down out of tower, angle pulley, anchor cup spiral shell at corresponding teeth block in tower
Mother draws downwards out of cable guide pipe, and decentralization is connect to bridge floor and with anchor cup rear end towing plate, at away from 5~10m of anchor cup on cable body
Double lifting point is set with 200KN special soft hanging belts, crane hook, which is put down, slings hanging belt, 50KN hoist engines while slinging
Start, 50KN hoist engines cooperate with tower crane tower end anchor cup pulling out tower end anchor plate, anchor cup nut are installed, by suspension cable
Anchor cup nut is threaded to design position；
4, rope is opened up in beam face
The expansion of suspension cable remaining cable body on cable tray, according to lifting weight parameter table using tower crane and service hoisting point
The mode of service hoisting cable body until suspension cable beam-ends anchor cup is detached from cable tray, when beam-ends anchor cup come to nothing cable tray 0.5~
When 1.0m, stop being promoted, beam face 50KN hoisting machines steel wire rope is connected by corner block with beam-ends anchor cup, cable body is fallen, by anchor
Cup is placed on anchor cup trolley, and 50KN hoisting machine rope closings, the speeds match that speed and the cable body of rope closing fall is good, forbids askew skew
It drags, until leading beam-ends anchor cup to corresponding cable guide pipe, cable body anchor cup is fixed temporarily with steel wire rope, next tower end is pacified
The drag-line for being attached to position carries out bridge floor exhibition rope, since tower crane lift heavy and service hoisting point promote cable body height limitation when long rope opens up rope,
Cable body on cable tray can not be all unfolded, 5 tons of beam face hoisting machine is utilized to draw cable tray at this time, carried out using ease method is partly dragged
Open up rope in beam face.It is spaced 4m~5m during opening up rope, between cable body and beam face and places a uniaxial trolley, prevents cable body and beam face
Contact causes to damage, and place mat rubber skin is with guard cable bulk damage between trolley and cable body；
5, beam-ends is drawn
5.1, tackline
It not presss from both sides away from the special Kazakhstan installation 400KN on the cable body at beam-ends anchor cup 5m~8m, is arranged with the soft hanging belts processed of 200KN
Towing point raises machine travel system with 400KN beam rolls and is connected, and breathes out and suspension centre is arranged on not folder, and 250KN truck cranes promote suspension centre, open
Dynamic beam roll raises machine travel system, and when anchor cup is drawn to beam face cable guide pipe mouth, anchor cup inclination angle is adjusted using 250KN truck cranes,
Keep it consistent with beam-ends cable guide pipe axis, this process is commanded the speed that cable body is promoted by special messenger, is prevented that anchor cup screw thread is impaired, is worked as anchor
When cup and extending fully enter cable guide pipe, it is laid with rubber skin or gunny in pipe conduit lower port, prevents traction later stage rope
Body is in direct contact with cable guide pipe lower port and causes to damage, and when anchor cup exposes outside anchor plate 5-10cm under beam, stops drawing, under beam
Bolt-nut is screwed in 2-3 screw threads in anchor cup by staff, to ensure later stage traction safety, is continued hoisting machine traction, is revolved simultaneously
Tight bolt-nut, until drawing anchor cup to design position；
5.2, middle rope
After beam-ends anchor cup installs connector sleeve and 6500KN tension rods successively, pacify on away from the cable body at beam-ends anchor cup 5m~8m
The special Kazakhstan dress 400KN not presss from both sides, and towing point is arranged with the soft hanging belts processed of 200KN, raises machine travel system with 400KN beam rolls and is connected,
Suspension centre is set on Ha Fu folders, and 250KN truck cranes promote suspension centre, start beam roll and raise machine travel system, when anchor cup and tension rod are led
When guiding to beam face cable guide pipe mouth, using 250KN truck cranes adjustment tension rod inclination angle, keep it consistent with beam-ends cable guide pipe axis, this
Process is commanded the speed that cable body is promoted by special messenger, prevents that tension rod and anchor cup screw thread are impaired.When anchor cup and extending fully enter
When cable guide pipe, it is laid with rubber skin or gunny in pipe conduit lower port, prevents that traction later stage cable body and cable guide pipe lower port are straight
Contact causes to damage, and when tension rod exposes outside anchor cup nut 5-10cm at anchor plate under beam, stops drawing, under beam on Hanging Basket
Tension rod pair nut is screwed in 3-5 screw threads in anchor cup by staff, to ensure later stage traction safety, continues hoisting machine traction, together
When screw tension rod pair nut, until by anchor cup wire sub-panel draw to suspension cable install operating mode stress table in respective distances；
5.3, long rope
Preparation：Beam face truck crane lifts movable Hanging Basket and 400KN tackle pulleys under beam in place, and soft traction body is arranged
System, the soft traction tonnage calculated according to the control of the inclined cable number of installation choose certain radical and the steel strand wires of length, steel strand wires
It is single-ended to be extruded into P anchors, as starting point, line is marked as unit of 1 meter at P anchors on every steel strand wires, convenient for more steel strand wires
Isometric control, while steel strand wires are penetrated into the traction casing on beam by root, in beam-ends away from the cable body installation at fixing end anchor cup 6m
400KN it is special Kazakhstan not press from both sides, be connected with 400KN beams face trailer system, startup beam roll raise machine travel system, anchor cup be drawn to away from
When the cable guide pipe mouth 5m of beam face, electric oil pump and 2500KN stretch-draw jacks are connected with high-pressure oil pipe, preparation is ready, uses
6500KN tension rods are expired screw thread by connector sleeve and screw in anchor cup rear end internal thread by truck crane, and will assemble traction steel strand wires
Traction casing expires screw thread and screws in tensioning rod rear end, steel strand wires penetrated under beam via guide carriage and cable guide pipe by root work anchor ring and
In tool anchor ring after 2500KN centre-hole jacks, the steel strand wires put on ensure to need between each other parallel suitable by sub-wire device
Directly；
After 2500KN tensioning spike, anchor ring, the positioning of 2500KN stretch-draw jacks, clamping tool intermediate plate starts soft under beam
Trailer system, it is reciprocal to draw, when tension rod is drawn to away from beam face 2~3m of cable guide pipe, the soft liftings of 100KN are installed on cable body
Rope, slowly promotes cable body by truck crane, tension rod and anchor cup is made smoothly to pass through from guide carriage, under tension rod and anchor cup
For port just seat when in the cable guide pipe lower port of beam face, truck crane slowly promotes cable body to step up inclining for tension rod and anchor cup
Angle, this process should command the speed that cable body is promoted and soft traction process by special messenger, prevent that anchor cup male thread directly withstands on cable guide pipe
The damage of anchor cup male thread is caused in port, when anchor cup and extending fully enter cable guide pipe, is laid in pipe conduit lower port
Rubber skin or gunny prevent that soft traction later stage cable body is in direct contact with cable guide pipe lower port and cause to damage, when 6500KN tensioning
Bar exposes outside under beam at anchor plate when 5~10cm of anchor cup nut, stops traction, and staff is by 6500KN tension rod pair anchors under beam
Gu nut screws in tension rod to flat button, this process terminates, and changes steel strand wires, in order to the safety traction of next skew cables, assembling
Tensioner draws work firmly before carrying out tensioning；
6, the traction of suspension cable hardness, tensioning and tune rope
6.1, inclined guy cable stretching equipment is installed
Tensioning equipment and operation platform are installed and are removed with truck crane under beam；
6.2, the preparation before inclined guy cable stretching
1) it, should check whether suspension cable collides with cable guide pipe, prevent from abrading suspension cable protective layer when tensioning；
2), stretch-draw jack and tensioning oil meter should be demarcated before marching into the arena；
3) it, should confide a technological secret before inclined guy cable stretching, confirm the stretching force and elongation of this rope, check that tensioning is very heavy
Whether top position is placed in the middle and adjusts fixation, checks the number of jack corollary equipment；
4), check whether anchor head and tension rod silk mouth damage in hanging；
5) billet for, preparing different-thickness, in case nut cushioning when tensioning；
6.3, the tensioning of suspension cable
When inclined guy cable stretching, should be classified, symmetrically, synchronous tension, carry out elongation, oil meter read-record, tensioning is suitable
Sequence is handled by design requirement, jack needed for tensioning, and oil pump, oil meter are answered mating calibration, matched, and tensioning record should be completely neat
Entirely；
Inclined guy cable stretching is controlled with the tension stress value of design code, and elongation, be in detail in stretching process as checking
Rope head should be measured convenient for mutually checking by recording position of the oil meter reading-Suo Li-elongation-rope heads with respect to anchor plate before and after tensioning
With the relative position of anchor plate, when oil pump operating personnel read oil meter reading, sight should be vertical with oil meter face, ensures reading essence
Really；
Before and after inclined guy cable stretching, it is necessary to the stress and displacement of bridge and Sarasota are monitored, it should be in temperature when measuring Suo Li
It is carried out when spending uniform, ordinary circumstance should be measured before sunrise and be finished；
Wherein, the specific calculations of dress Suo Li T of the tensioning of suspension cable are as follows：
Suspension cable steel wire cutting length be L, tower, beam both ends rope hole anchor slab center geometric distance L0, beam-ends anchor cup sub-wire
Plate pier nose to anchor plate distance be Δ LBeam, tower end anchor cup wire sub-panel pier nose to anchor plate distance is Δ LTower, acted in tractive force T
Under, elastic elongation amount is TL/EA, and the elongation that sag influences is approximately-w2L2 xL0/(24T2),
Therefore it can obtain：ΔLTower-ΔLBeam=L-L0-(ω2L2 xL0)/(24T2)+TL/AE(24L/AE)T3+24×(L-L0-Δ
LTower+ΔLBeam)T2-ω2L2 xL0=0
The simple cubic equation that variable is T is solved, it is oblique so as to find out each operating mode by containing golden equations simple cubic equation
Drag-line installs Suo Li T；
Wherein, Δ LBeam- beam-ends wire sub-panel pier nose is to anchor plate apart from (being negative value when pull-out)；
ΔLTower- tower end wire sub-panel pier nose is to anchor plate apart from (being positive value when pull-out)；
L-suspension cable steel wire cutting length；
L0- tower, beam both ends rope hole anchor slab center geometric distance；
ω-suspension cable unit weight；
LX—L0Floor projection length；
T-tractive force；
A-section of steel wire area；
E-elasticity modulus；
6.4, the principle that cable force adjustment tune rope should follow is：Suo Li meets design or code requirement after adjustment；Adjust Suo Qianji
It calculates adjusted values at different levels and lists corresponding elongation, the preparation of Suo Li detection and other various observations is performed before tune rope；
It adjusts rope to press the corresponding stretching force of predetermined level, Suo Li is adjusted by electric oil pump oil inlet or oil return step by step, if it is
Reduce Suo Li, then first oil inlet pulls suspension cable, and anchor circle is enable to loosen, after unscrewing anchor ring can oil return so that stay cable force is dropped
It is low.
Further, in " 3, tower end install " step, service hoisting point service hoisting rope can be used according to lifting weight
Body.
Specific implementation mode
The suspension cable construction method of installation specific implementation mode of the application is as follows：
1, suspension cable installation prepares
1.1, the inspection of finished product rope
Design requirement is pressed before suspension cable manufacture, is tested to the related performance of suspension cable.After suspension cable reaches scene, to oblique
Drag-line is inspected for acceptance, building site of being allowed for access after passed examination.Suspension cable field test includes manufacture materials confirming and oblique pull
Rope appearance is checked and accepted.
1.2, built-in fitting is set
Before the areas king-tower You Suo construct, the related embedded part structure figure of suspension cable installation and built-in fitting layout drawing are provided.
Built-in fitting carried out during Construction of Pylon it is pre-buried, suspension cable installation built-in fitting be mainly turn in tower and tensioning equipment fix it is pre-
Service hoisting frame built-in fitting, tower top are pre-buried into people hole 50KN hoist engines fixation built-in fitting, tower top on embedded part, king-post middle cross beam
Part.
1.3, cable guide pipe inspection
Suspension cable anchor cup outer diameter differs very little with the internal diameter of cable guide pipe, easily generation position deviation when hanging cable, to cause
The damage of anchor cup male thread and suspension cable PE protective cases, thus suspension cable hang before the cable guide pipe of tower, beam-ends should be carried out it is comprehensive
Inspection, polishing is tied to welding slag, the burr etc. in cable guide pipe, should be repaired in time when suspension cable has crimp.
2, suspension cable transport and the upper bridge of lifting
Cable body lower end should additionally arrange wood lump supporting pad when suspension cable is stored, and between the lumps of wood and cable body plus it is certain thickness it is soft every
From object (such as blanket), suspension cable is not allowed directly to be contacted with beam face or ground, forbid that there are burning things which may cause a fire disaster around cable body in 10 meters, such as
It need to really be welded around cable body, gas cutting, must carry out safety to related personnel before operation tells somebody what one's real intentions are, and is equipped with extinguishing device simultaneously.
3 suspension centres are set when being lifted by crane at disk suspension cable, using dedicated hanging belt, are forbidden with the direct pocket of steel wire rope in suspension cable
On, to avoid damage PE sheaths and clashing and breaking anchor head screw thread.If it was found that anchor head screw thread has microlesion that should modify in time, PE is protected
The indentation and local damage of the ㎜ depths of appearance >=3 are put on, specific purpose tool material identical with PE sheaths should be used to impaired place's progress
It repairs, this process should have been handled before hanging cable.
3, tower end is installed
The cable body being placed on 200KN cable trays with tower crane pulls out 8m length and is placed on Liang Mianshang, after suspension cable anchor cup
End installation towing plate.Tower top 50KN steel wire rope of windlass is put down out of tower, angle pulley, anchor cup spiral shell at corresponding teeth block in tower
Mother draws downwards out of cable guide pipe, and decentralization is connect to bridge floor and with anchor cup rear end towing plate.At away from 5~10m of anchor cup on cable body
Double lifting point is set with 200KN special soft hanging belts, crane hook, which is put down, slings hanging belt.50KN hoist engines while slinging
Start, 50KN hoist engines cooperate with tower crane tower end anchor cup pulling out tower end anchor plate (according to lifting weight parameter table, portion
Divide suspension cable that need to use service hoisting point service hoisting cable body), anchor cup nut is installed, suspension cable anchor cup nut is threaded to design position
It sets.
4, rope is opened up in beam face
The expansion of suspension cable remaining cable body on cable tray, according to lifting weight parameter table using tower crane and service hoisting point
The mode of service hoisting cable body by suspension cable beam-ends anchor cup until be detached from cable tray.When beam-ends anchor cup come to nothing cable tray 0.5~
When 1.0m, stop being promoted, beam face 50KN hoisting machines steel wire rope is connected by corner block with beam-ends anchor cup, cable body is fallen, by anchor
Cup is placed on anchor cup trolley, and 50KN hoisting machine rope closings, the speeds match that speed and the cable body of rope closing fall is good, forbids askew skew
It drags, until leading beam-ends anchor cup to corresponding cable guide pipe, cable body anchor cup is fixed temporarily with steel wire rope, next tower end is pacified
The drag-line for being attached to position carries out bridge floor exhibition rope.Since tower crane lift heavy and service hoisting point promote cable body height limitation when long rope exhibition rope,
Cable body on cable tray can not be all unfolded, 5 tons of beam face hoisting machine is utilized to draw cable tray at this time, carried out using ease method is partly dragged
Open up rope in beam face.It is spaced 4m~5m during opening up rope, between cable body and beam face and places a uniaxial trolley, prevents cable body and beam face
Contact causes to damage, and place mat rubber skin is with guard cable bulk damage between trolley and cable body.
5, beam-ends is drawn
5.1, tackline
It not presss from both sides away from the special Kazakhstan installation 400KN on the cable body at beam-ends anchor cup 5m~8m, (is walked with the soft hanging belts processed of 200KN
It is double) setting towing point, it raises machine travel system with 400KN beam rolls and is connected.Suspension centre is set on Ha Fu folders, and 250KN truck cranes are promoted
Suspension centre starts beam roll and raises machine travel system, and when anchor cup is drawn to beam face cable guide pipe mouth, anchor is adjusted using 250KN truck cranes
Cup inclination angle, keeps it consistent with beam-ends cable guide pipe axis.This process by special messenger command cable body promoted speed, prevent anchor cup screw thread by
Damage.When anchor cup and extending fully enter cable guide pipe, it is laid with rubber skin or gunny in pipe conduit lower port, prevents traction
Later stage cable body is in direct contact with cable guide pipe lower port and causes to damage.When anchor cup exposes outside anchor plate 5-10cm under beam, stop leading
Draw, bolt-nut is screwed in 2-3 screw threads in anchor cup by staff under beam, to ensure later stage traction safety.Continue hoisting machine traction,
Bolt-nut is screwed simultaneously, until drawing anchor cup to design position.
5.2, middle rope
After beam-ends anchor cup installs connector sleeve and 6500KN tension rods successively, pacify on away from the cable body at beam-ends anchor cup 5m~8m
The special Kazakhstan dress 400KN not presss from both sides, and (walks double) setting towing point with the soft hanging belts processed of 200KN, machine travel system is raised with 400KN beam rolls
It is connected.Suspension centre is set on Ha Fu folders, and 250KN truck cranes promote suspension centre, start beam roll and raise machine travel system, when anchor cup and tensioning
When bar is drawn to beam face cable guide pipe mouth, using 250KN truck cranes adjustment tension rod inclination angle, make itself and beam-ends cable guide pipe axis one
It causes.This process is commanded the speed that cable body is promoted by special messenger, prevents that tension rod and anchor cup screw thread are impaired.When anchor cup and extending are whole
When into cable guide pipe, it is laid with rubber skin or gunny in pipe conduit lower port, prevents traction later stage cable body and cable guide pipe lower end
Mouth, which is in direct contact, to be caused to damage.When tension rod exposes outside anchor cup nut 5-10cm at anchor plate under beam, stops traction, hung under beam
Tension rod pair nut is screwed in 3-5 screw threads in anchor cup by staff on basket, to ensure later stage traction safety.Continue hoisting machine to lead
Draw, while screwing tension rod pair nut, respective distances in operating mode stress table are installed until drawing anchor cup wire sub-panel to suspension cable.
5.3, long rope
Preparation：Beam face truck crane lifts movable Hanging Basket and 400KN tackle pulleys under beam in place, and soft traction body is arranged
System, the soft traction tonnage calculated according to the control of the inclined cable number of installation choose certain radical and the steel strand wires of length, steel strand wires
It is single-ended to be extruded into P anchors, as starting point, line is marked as unit of 1 meter at P anchors on every steel strand wires, convenient for more steel strand wires
Isometric control, while steel strand wires being penetrated by root to the traction casing on beam.In beam-ends away from the cable body installation at fixing end anchor cup 6m
The special Kazakhstan 400KN not presss from both sides, and is connected with 400KN beams face trailer system.Start beam roll raise machine travel system, anchor cup be drawn to away from
When the cable guide pipe mouth 5m of beam face, electric oil pump and 2500KN stretch-draw jacks are connected with high-pressure oil pipe, preparation is ready.With
6500KN tension rods are expired screw thread by connector sleeve and screw in anchor cup rear end internal thread by truck crane, and will assemble traction steel strand wires
Traction casing expires screw thread and screws in tensioning rod rear end, steel strand wires penetrated under beam via guide carriage and cable guide pipe by root work anchor ring and
In tool anchor ring after 2500KN centre-hole jacks, the steel strand wires put on ensure to need between each other parallel suitable by sub-wire device
Directly.
After 2500KN tensioning spike, anchor ring, the positioning of 2500KN stretch-draw jacks, clamping tool intermediate plate starts soft under beam
Trailer system, it is reciprocal to draw.When tension rod is drawn to away from beam face 2~3m of cable guide pipe, the soft liftings of 100KN are installed on cable body
Rope, slowly promotes cable body by truck crane, tension rod and anchor cup is made smoothly to pass through from guide carriage.Under tension rod and anchor cup
For port just seat when in the cable guide pipe lower port of beam face, truck crane slowly promotes cable body to step up inclining for tension rod and anchor cup
Angle, this process should command the speed that cable body is promoted and soft traction process by special messenger, prevent that anchor cup male thread directly withstands on cable guide pipe
Cause the damage of anchor cup male thread in port.When anchor cup and extending fully enter cable guide pipe, it is laid in pipe conduit lower port
Rubber skin or gunny prevent that soft traction later stage cable body is in direct contact with cable guide pipe lower port and cause to damage.When 6500KN tensioning
Bar exposes outside under beam at anchor plate when 5~10cm of anchor cup nut, stops traction, and staff is by 6500KN tension rod pair anchors under beam
Gu nut screws in tension rod to flat button, this process terminates.Steel strand wires are changed, in order to the safety traction of next skew cables, assembling
Tensioner draws work firmly before carrying out tensioning.
6, the traction of suspension cable hardness, tensioning and tune rope
6.1, inclined guy cable stretching equipment is installed
Tensioning equipment and operation platform are installed and are removed with truck crane under beam.
6.2, the preparation before inclined guy cable stretching
1) it, should check whether suspension cable collides with cable guide pipe, prevent from abrading suspension cable protective layer when tensioning.
2) there should be qualification monitoring unit to be demarcated in country before, stretch-draw jack and tensioning oil meter are marched into the arena, and mark is provided
Determine certificate, the regression equation demarcated in certificate is the important evidence of oil meter reading and stretching force conversion.
3) it, should confide a technological secret before inclined guy cable stretching, confirm the stretching force and elongation of this rope, check that tensioning is very heavy
Whether top position is placed in the middle and adjusts fixation, checks the number of jack corollary equipment to confirm that the recurrence that the jack is demarcated
Equation.
4), check whether anchor head and tension rod silk mouth damage in hanging.
5) billet for, preparing different-thickness, in case nut cushioning when tensioning.
6), various record forms are on deck before inclined guy cable stretching；
7) every safety measure, is required all to have before inclined guy cable stretching perfect, and qualified on inspection.
6.3, the tensioning of suspension cable
When inclined guy cable stretching, it should be directed to the tensioning instruction that operating mode of setting a roof beam in place is assigned according to monitoring leading group and be classified, be right
Claim, synchronous tension.Elongation, oil meter read-record are carried out, tension sequence is handled by design requirement, jack needed for tensioning, oil
Pump, oil meter are answered mating calibration, are matched, and tensioning record should be complete complete.
Inclined guy cable stretching is controlled with the command value of the tension stress value of design code or monitoring leading group, elongation conduct
It checks.In stretching process, position of the oil meter reading-Suo Li-elongation-rope head with respect to anchor plate is recorded in detail, convenient for mutual
It checks, the relative position of rope head and anchor plate should be measured before and after tensioning.When oil pump operating personnel read oil meter reading, sight should be with
Oil meter face is vertical, ensures that reading is accurate.Ambient noise is big when such as inclined guy cable stretching, and oil pump operating personnel should wear intercom ear
Machine.
Before and after inclined guy cable stretching, it is necessary to the stress and displacement of bridge and Sarasota are monitored, it should be in temperature when measuring Suo Li
It is carried out when spending uniform, ordinary circumstance should be measured before sunrise and be finished.
6.4, the principle that cable force adjustment tune rope should follow is：Suo Li meets design or code requirement after adjustment.Adjust Suo Qianji
It calculates adjusted values at different levels and lists corresponding elongation.The preparation of Suo Li detection and other various observations is performed before tune rope.
It adjusts rope to press the corresponding stretching force of predetermined level, Suo Li is adjusted by electric oil pump oil inlet or oil return step by step.If it is
Reduce Suo Li, then first oil inlet pulls suspension cable, and anchor circle is enable to loosen, after unscrewing anchor ring can oil return so that stay cable force is dropped
It is low.
Claims (2)
1. a kind of suspension cable construction method of installation, includes the following steps：
1, suspension cable installation prepares
1.1, the inspection of finished product rope
Design requirement is pressed before suspension cable manufacture, is tested to the related performance of suspension cable, after suspension cable reaches scene, to suspension cable
It inspects for acceptance, building site of being allowed for access after passed examination；
1.2, built-in fitting is set
Before the areas king-tower You Suo construct, the related embedded part structure figure of suspension cable installation and built-in fitting layout drawing are provided, it is pre-buried
Part carried out during Construction of Pylon it is pre-buried, suspension cable installation built-in fitting be mainly turn in tower and tensioning equipment fix it is pre-buried
Service hoisting frame built-in fitting, tower top fix built-in fitting, tower top built-in fitting into people hole 50KN hoist engines on part, king-post middle cross beam；
1.3, cable guide pipe inspection
Suspension cable anchor cup outer diameter differs very little with the internal diameter of cable guide pipe, easily generation position deviation when hanging cable, to cause anchor cup
The damage of male thread and suspension cable PE protective cases, thus suspension cable hang before the cable guide pipe of tower, beam-ends should comprehensively be examined
It looks into, polishing is tied to welding slag, the burr in cable guide pipe, should be repaired in time when suspension cable has crimp；
2, suspension cable transport and the upper bridge of lifting
Cable body lower end should additionally arrange wood lump supporting pad when suspension cable is stored, and between the lumps of wood and cable body plus certain thickness soft be isolated
Object does not allow suspension cable directly to be contacted with beam face or ground, forbids that there are burning things which may cause a fire disaster around cable body in 10 meters, such as really need to be in cable body week
Weld all around connects, gas cutting, and must carry out safety to related personnel before operation tell somebody what one's real intentions are, and be equipped with extinguishing device simultaneously；
3 suspension centres are set when being lifted by crane at disk suspension cable, using dedicated hanging belt, are forbidden with the direct pocket of steel wire rope on suspension cable,
To avoid damage PE sheaths and clashing and breaking anchor head screw thread, if finding, anchor head screw thread has microlesion that should modify in time, on PE sheaths
There is the indentation and local damage of >=3 ㎜ depths, specific purpose tool material identical with PE sheaths should be used to repair impaired place,
This process should have been handled before hanging cable；
3, tower end is installed
The cable body being placed on 200KN cable trays with tower crane pulls out 8m length and is placed on Liang Mianshang, pacifies in suspension cable anchor cup rear end
Towing plate is filled, tower top 50KN steel wire rope of windlass is put down out of tower, angle pulley, anchor cup nut at corresponding teeth block in tower,
It is drawn downwards out of cable guide pipe, decentralization is connect to bridge floor and with anchor cup rear end towing plate, is used on cable body at away from 5~10m of anchor cup
Double lifting point is arranged in the special soft hanging belts of 200KN, and crane hook, which is put down, slings hanging belt, and 50KN hoist engines open while slinging
Dynamic, 50KN hoist engines cooperate with tower crane tower end anchor cup pulling out tower end anchor plate, anchor cup nut are installed, by suspension cable anchor
Cup nut is threaded to design position；
4, rope is opened up in beam face
The expansion of suspension cable remaining cable body on cable tray is assisted according to lifting weight parameter table using tower crane and service hoisting point
The mode of promotion cable body by suspension cable beam-ends anchor cup up to being detached from cable tray, when beam-ends anchor cup comes to nothing 0.5~1.0m of cable tray,
Stop being promoted, beam face 50KN hoisting machines steel wire rope is connected with beam-ends anchor cup by corner block, falls cable body, anchor cup is placed in
On anchor cup trolley, 50KN hoisting machine rope closings, the speeds match that speed and the cable body of rope closing fall is good, and askew skew is forbidden to drag, until
Beam-ends anchor cup is led to corresponding cable guide pipe, cable body anchor cup is fixed temporarily with steel wire rope, next tower end is installed in place
Drag-line carry out bridge floor and open up rope, can not will since tower crane lift heavy and service hoisting point promote cable body height limitation when long rope exhibition rope
Cable body is all unfolded on cable tray, utilizes the 5 tons of hoisting machines in beam face to draw cable tray at this time, using partly drag ease method into the exhibition of cross girders face
Rope is spaced 4m~5m and places a uniaxial trolley, prevents cable body from being contacted with beam face and make during opening up rope, between cable body and beam face
At damage, place mat rubber skin is with guard cable bulk damage between trolley and cable body；
5, beam-ends is drawn
5.1, tackline
It is not pressed from both sides away from the special Kazakhstan installation 400KN on the cable body at beam-ends anchor cup 5m~8m, with the soft hanging belt setting tractions processed of 200KN
Point raises machine travel system with 400KN beam rolls and is connected, and breathes out and suspension centre is arranged on not folder, and 250KN truck cranes promote suspension centre, start beam
Roll raises machine travel system, when anchor cup is drawn to beam face cable guide pipe mouth, using 250KN truck cranes adjustment anchor cup inclination angle, makes it
Consistent with beam-ends cable guide pipe axis, this process is commanded the speed that cable body is promoted by special messenger, prevents that anchor cup screw thread is impaired, when anchor cup and
When extending fully enters cable guide pipe, rubber skin or gunny are laid in pipe conduit lower port, prevent traction later stage cable body with
Cable guide pipe lower port, which is in direct contact, to be caused to damage, and when anchor cup exposes outside anchor plate 5-10cm under beam, is stopped traction, is worked under beam
Bolt-nut is screwed in 2-3 screw threads in anchor cup by personnel, to ensure later stage traction safety, continues hoisting machine traction, while screwing anchor
Gu nut, until drawing anchor cup to design position；
5.2, middle rope
After beam-ends anchor cup installs connector sleeve and 6500KN tension rods successively, installed on away from the cable body at beam-ends anchor cup 5m~8m
The special Kazakhstan 400KN not presss from both sides, and towing point is arranged with the soft hanging belts processed of 200KN, raises machine travel system with 400KN beam rolls and is connected, breathe out
Suspension centre is not set on folder, and 250KN truck cranes promote suspension centre, start beam roll and raise machine travel system, when anchor cup and tension rod are drawn
When to beam face cable guide pipe mouth, using 250KN truck cranes adjustment tension rod inclination angle, keep it consistent with beam-ends cable guide pipe axis, this mistake
Journey is commanded the speed that cable body is promoted by special messenger, prevents that tension rod and anchor cup screw thread are impaired, when anchor cup and extending fully enter rope
When conduit, it is laid with rubber skin or gunny in pipe conduit lower port, prevents that traction later stage cable body and cable guide pipe lower port are direct
Contact causes to damage, and when tension rod exposes outside anchor cup nut 5-10cm at anchor plate under beam, stops drawing, work on Hanging Basket under beam
Make personnel and tension rod pair nut is screwed in into 3-5 screw threads in anchor cup, to ensure later stage traction safety, continues hoisting machine traction, simultaneously
Tension rod pair nut is screwed, respective distances in operating mode stress table are installed until drawing anchor cup wire sub-panel to suspension cable；
5.3, long rope
Preparation：Beam face truck crane lifts movable Hanging Basket and 400KN tackle pulleys under beam in place, and soft Traction sysytem, root is arranged
The soft traction tonnage calculated according to the inclined cable number control of installation chooses certain radical and the steel strand wires of length, and steel strand wires are single-ended to be squeezed
At P anchors, as starting point, line is marked as unit of 1 meter at P anchors on every steel strand wires, it is convenient for the isometric control of more steel strand wires
System, while steel strand wires are penetrated into the traction casing on beam by root, it is special away from the cable body installation 400KN at fixing end anchor cup 6m in beam-ends
Ha Fu is pressed from both sides, and is connected with 400KN beams face trailer system, is started beam roll and is raised machine travel system, is drawn in anchor cup and is led away from beam face rope
When nozzle 5m, electric oil pump and 2500KN stretch-draw jacks are connected with high-pressure oil pipe, preparation is ready, will with truck crane
6500KN tension rods expire screw thread by connector sleeve and screw in anchor cup rear end internal thread, and the traction casing for having assembled traction steel strand wires is expired
Screw thread screws in tensioning rod rear end, and steel strand wires penetrate under beam work anchor ring and 2500KN punchings by root via guide carriage and cable guide pipe
In tool anchor ring after formula jack, the steel strand wires put on ensure to need between each other parallel straight by sub-wire device；
After 2500KN tensioning spike, anchor ring, the positioning of 2500KN stretch-draw jacks, clamping tool intermediate plate starts soft traction under beam
System, it is reciprocal to draw, when tension rod is drawn to away from beam face 2~3m of cable guide pipe, the soft hoisting ropes of 100KN are installed on cable body,
Cable body is slowly promoted by truck crane, tension rod and anchor cup is made smoothly to pass through from guide carriage, in tension rod and anchor cup lower end
When in the cable guide pipe lower port of beam face, truck crane slowly promotes cable body to step up inclining for tension rod and anchor cup for mouthful just seat
Angle, this process should command the speed that cable body is promoted and soft traction process by special messenger, prevent that anchor cup male thread directly withstands on cable guide pipe
The damage of anchor cup male thread is caused in port, when anchor cup and extending fully enter cable guide pipe, is laid in pipe conduit lower port
Rubber skin or gunny prevent that soft traction later stage cable body is in direct contact with cable guide pipe lower port and cause to damage, when 6500KN tensioning
Bar exposes outside under beam at anchor plate when 5~10cm of anchor cup nut, stops traction, and staff is by 6500KN tension rod pair anchors under beam
Gu nut screws in tension rod to flat button, this process terminates, and changes steel strand wires, in order to the safety traction of next skew cables, assembling
Tensioner draws work firmly before carrying out tensioning；
6, the traction of suspension cable hardness, tensioning and tune rope
6.1, inclined guy cable stretching equipment is installed
Tensioning equipment and operation platform are installed and are removed with truck crane under beam；
6.2, the preparation before inclined guy cable stretching
1) it, should check whether suspension cable collides with cable guide pipe, prevent from abrading suspension cable protective layer when tensioning；
2), stretch-draw jack and tensioning oil meter should be demarcated before marching into the arena；
3) it, should confide a technological secret before inclined guy cable stretching, confirm the stretching force and elongation of this rope, check stretch-draw jack position
It whether placed in the middle and adjust fixation sets, checks the number of jack corollary equipment；
4), check whether anchor head and tension rod silk mouth damage in hanging；
5) billet for, preparing different-thickness, in case nut cushioning when tensioning；
6.3, the tensioning of suspension cable
When inclined guy cable stretching, should be classified, symmetrically, synchronous tension, carry out elongation, oil meter read-record, tension sequence is pressed
Design requirement is handled, jack needed for tensioning, and oil pump, oil meter are answered mating calibration, matched, and tensioning record should be complete complete；
Inclined guy cable stretching is controlled with the tension stress value of design code, and elongation in stretching process, record in detail as checking
Oil meter reading-Suo Li-elongation-rope head should measure rope head and anchor with respect to the position of anchor plate convenient for mutually checking before and after tensioning
The relative position of backing plate, when oil pump operating personnel read oil meter reading, sight should be vertical with oil meter face, ensures that reading is accurate；
Before and after inclined guy cable stretching, it is necessary to the stress and displacement of bridge and Sarasota are monitored, it should be equal in temperature when measuring Suo Li
It is carried out when even, ordinary circumstance should be measured before sunrise and be finished；
Wherein, the specific calculations of dress Suo Li T of the tensioning of suspension cable are as follows：
Suspension cable steel wire cutting length be L, tower, beam both ends rope hole anchor slab center geometric distance L0, beam-ends anchor cup wire sub-panel pier
Head is Δ L beams to anchor plate distance, and tower end anchor cup wire sub-panel pier nose to anchor plate distance is Δ L towers, under tractive force T effects,
Its elastic elongation amount is TL/EA, and the elongation that sag influences is approximately-w2L2xL0/ (24T2),
Therefore it can obtain：Δ L towers-Δ L beams=L-L0- (ω 2L2xL0)/(24T2)+TL/AE (24L/AE) T3+24 × (L-L0- Δs
L towers+Δ L beams) T2- ω 2L2xL0=0
The simple cubic equation that variable is T is solved, so as to find out each operating mode suspension cable installation Suo Li T；
Wherein, Δ L beams-beam-ends wire sub-panel pier nose is to anchor plate distance (when pull-out be negative value)；
Δ L towers-tower end wire sub-panel pier nose is to anchor plate apart from (being positive value when pull-out)；
L-suspension cable steel wire cutting length；
L0-tower, beam both ends rope hole anchor slab center geometric distance；
ω-suspension cable unit weight；
The floor projection length of LX-L0；
T-tractive force；
A-section of steel wire area；
E-elasticity modulus；
6.4, the principle that cable force adjustment tune rope should follow is：Suo Li meets design or code requirement after adjustment；It is calculated respectively before adjusting rope
Grade adjusted value simultaneously lists corresponding elongation, and the preparation of Suo Li detection and other various observations is performed before tune rope；
It adjusts rope to press the corresponding stretching force of predetermined level, Suo Li is adjusted by electric oil pump oil inlet or oil return step by step, if it is reduction
Suo Li, then first oil inlet pull suspension cable, anchor circle are enable to loosen, after unscrewing anchor ring can oil return so that stay cable force is reduced.
2. suspension cable construction method of installation according to claim 1, which is characterized in that in " 3, tower end install " step,
Service hoisting point service hoisting cable body can be used according to lifting weight.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108149928A (en) * | 2017-12-21 | 2018-06-12 | 中交路桥华南工程有限公司 | The tower end installation method of suspension cable |
| CN111364363A (en) * | 2020-03-17 | 2020-07-03 | 山西四建集团有限公司 | Stay cable construction tensioning method |
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| CN101126222A (en) * | 2007-07-17 | 2008-02-20 | 中铁十七局集团第二工程有限公司 | Method for conversing force of bridge inclined cable |
| CN101967796B (en) * | 2010-09-19 | 2011-11-23 | 湖南路桥建设集团公司 | Method for arranging parallel steel wire stay cable |
| KR101198453B1 (en) * | 2010-11-09 | 2012-11-06 | 박경룡 | Cable Anchoring System in Bridge |
| CN102286944B (en) * | 2011-08-23 | 2013-03-06 | 河海大学 | Device for replacing stay cable of cable-stayed bridge |
| CN102535348B (en) * | 2012-03-14 | 2013-10-30 | 天津市市政工程设计研究院 | Method for tensioning stayed cables of hinged tower cable stayed bridge |
| KR101505400B1 (en) * | 2014-10-16 | 2015-03-25 | 박정환 | Multi-functional cap of protecting tube for anchor and cable fixing device with this cap |
| CN104762880B (en) * | 2015-05-03 | 2016-08-31 | 朱玉新 | The bridge dragline structure of a kind of improvement and hang method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108149928A (en) * | 2017-12-21 | 2018-06-12 | 中交路桥华南工程有限公司 | The tower end installation method of suspension cable |
| CN108149928B (en) * | 2017-12-21 | 2020-05-19 | 中交路桥华南工程有限公司 | Tower end installation method of stay cable |
| CN111364363A (en) * | 2020-03-17 | 2020-07-03 | 山西四建集团有限公司 | Stay cable construction tensioning method |
| CN111364363B (en) * | 2020-03-17 | 2021-09-21 | 山西四建集团有限公司 | Stay cable construction tensioning method |
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