CN112942151A - Carbon fiber cable net wind-resistant reinforced structure system of ultra-large span suspension bridge and construction method thereof - Google Patents
Carbon fiber cable net wind-resistant reinforced structure system of ultra-large span suspension bridge and construction method thereof Download PDFInfo
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- E01D19/00—Structural or constructional details of bridges
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Abstract
A space cable reinforcing system and a temporary wind-resistant cable reinforcing system are provided for the extra-large-span strait-sea gorges suspension bridge, and a carbon fiber cable net wind-resistant reinforcing structure system of the extra-large-span suspension bridge is formed. The bridge tower structure is transformed into a four-limb column bridge tower with a parabolic arched tower cap, a hyperbolic paraboloid carbon fiber cable space cable net and a parabolic steel structure curved beam are added on a parallel steel wire cable system, the hyperbolic paraboloid carbon fiber cable space cable net and the parabolic steel structure curved beam are firmly connected together by a clamp, the parallel steel wire cable bears vertical load, the hyperbolic paraboloid carbon fiber space cable net improves the torsional rigidity of the cable net, and the flutter critical wind speed of the cable net is greatly improved. The method is characterized in that a plurality of submarine ground anchor piles are arranged on the seabed, the lower ends of carbon fiber wind-resistant cables are connected with the submarine ground anchor piles, the upper ends of the carbon fiber wind-resistant cables are connected with a stiffening beam of a suspension bridge to form a temporary wind-resistant cable reinforcing system, after a meteorological satellite forecasts that severe super-strong typhoon is rarely encountered, channel traffic is closed, the temporary wind-resistant cable system is started, and the super-strong typhoon disaster is resisted.
Description
Technical Field
The invention belongs to the field of bridge engineering, relates to a reinforcing technology of an oversized-span suspension bridge structure, and particularly relates to a carbon fiber cable net wind-resistant reinforcing structure system of an oversized-span suspension bridge and a construction method thereof.
Background
With the increasing span of the parallel cable suspension bridge, the torsional rigidity of the parallel cable suspension bridge is obviously reduced, the structure of the suspension bridge with the ultra-large span is gradually softened, and the flutter wind-resistant stability problem is increasingly serious.
For a parallel cable suspension bridge, as the span increases, both the vertical and torsional frequencies decrease, gradually tending to approach, with the result that flutter instability will occur at lower wind speeds. Therefore, how to ensure that the oversized span suspension bridge has enough wind resistance stability while improving the spanning capability of the suspension bridge is a great problem faced by the oversized span suspension bridge in the future.
The super-large span suspension bridge has three types of methods for improving the wind resistance of the structure: the effect of improving the wind resistance stability of the oversized span suspension bridge by the two methods is very limited for the oversized span suspension bridge, however, the space cable net is adopted to carry out wind resistance reinforcement treatment on the parallel cable suspension bridge structure, only some construction procedures are needed to be added, the torsional rigidity and the lateral rigidity of the oversized span suspension bridge structure can be greatly improved, so that good wind resistance stability is obtained, and the construction of the oversized span strait bridge of 4000-5000 m can be expected.
On the basis of a parallel steel wire cable system suspension bridge, an original bridge tower structure is modified into a four-limb column bridge tower with a parabolic arched tower cap, a hyperbolic paraboloid carbon fiber cable space cable net is added on the parallel steel wire cable system to form an ultra-large span space mixed cable channel suspension bridge, the parallel steel wire cable system bears vertical load, the torsional rigidity of the hyperbolic paraboloid carbon fiber cable space cable net is increased, the torsional frequency and the torsional frequency ratio are improved, and the wind resistance stability of the ultra-large span space cable channel suspension bridge can be greatly improved.
The global Hercino phenomenon is aggravated, the typhoon intensity is continuously increased, the ultra-large span strait suspension bridge needs to adopt the design scheme of the ultra-large span space mixed cable strait suspension bridge, and meanwhile, the spare temporary reinforcement scheme of rarely meeting super-strong typhoon is needed.
In the design benchmark of the bridge, the ultra-large span strait suspension bridge encounters super-strong typhoon only for a plurality of times, the wind resistance design standard of the ultra-large span space cable strait suspension bridge is accurately determined to be capable of resisting the rare super-strong typhoon, and the design method is not practical technically and economically and is unnecessary.
Nowadays, meteorological satellite technology is very developed, can accomplish to forecast super strong typhoon in advance several days accurately completely, meet the super strong typhoon rarely and reach before, seal the channel traffic, super large span strait-suspended bridge launches interim anti-wind cable reinforcement system, carries out the interim anti-wind cable reinforcement processing of super large span space cable strait-span strait-suspended bridge, so, just can protect super large span strait-suspended bridge to steadily safely live the short super strong typhoon calamity of several days rarely.
By using the anchor chain cable method of a large ship for reference, after rare super strong typhoon forecast is known, the temporary carbon fiber wind-resistant reinforcing cable anchored on the submarine anchor pile and deeply buried in the seabed groove is pulled to the bridge floor, the temporary carbon fiber wind-resistant reinforcing cable is firmly fixed on the stiffening beam bridge floor to resist the super strong typhoon disaster, the technology is feasible, and the scheme is economic and reasonable.
Disclosure of Invention
The technical problem is as follows: in order to overcome the defects in the prior art, the invention provides a carbon fiber cable net wind-resistant reinforced structure system of an oversized span suspension bridge and a construction method thereof.
The technical scheme is as follows: the invention discloses a carbon fiber cable net wind-resistant reinforcing structure system of an oversized span suspension bridge, which comprises a four-limb column bridge tower, an anchorage structure, a parallel steel wire cable, a space cable reinforcing system, a suspender, a truss type stiffening girder, an arch-shaped central buckle and a temporary wind-resistant cable reinforcing system, and is characterized in that: a four-limb column bridge tower with a parabolic arched tower cap comprises four-limb columns of a portal frame, parabolic arched tower caps and tower cap supporting inclined columns, a left and a right two pendulous parallel steel wire cables are suspended between the two four-limb column bridge towers with the parabolic arched tower caps, the left and the right two pendulous parallel steel wire cables are anchored in anchor structures, a space cable reinforcing system consists of a hyperbolic paraboloid carbon fiber space cable net and a parabolic steel structure curved beam, the hyperbolic paraboloid carbon fiber space cable net is formed by spatial crossing of a plurality of carbon fiber cables, the spatial configuration is a space cable net formed by the pendulous hyperbolic paraboloid straight-line curved cable net, the hyperbolic paraboloid carbon fiber space cable net covers the left and the right two parallel steel wire cables, a plurality of parabolic steel structure curved beams are placed on the hyperbolic paraboloid carbon fiber space cable net, the hyperbolic paraboloid carbon fiber space cable net is divided into a left and a right two strands and is centralized and anchored in the left and right anchor structures, the parallel steel wire cables, the hyperbolic paraboloid carbon fiber space cable net 41 and the parabolic steel structure curved beam are firmly connected by a clamp; the suspension rods are divided into two groups, namely vertical steel wire suspension rods and oblique carbon fiber suspension rods, the upper ends of the vertical steel wire suspension rods are connected with parallel steel wire cables, the lower ends of the vertical steel wire suspension rods are connected with truss type stiffening girders, the upper ends of the oblique carbon fiber suspension rods are connected with parabolic steel structure curved girders, the lower ends of the oblique carbon fiber suspension rods are connected with the truss type stiffening girders, and steel pipe concrete arch-shaped central buckles are arranged in the middle area of the suspension; the temporary wind-resistant cable reinforcing system consists of seabed ground anchor piles and carbon fiber wind-resistant cables, a certain number of carbon fiber wind-resistant cables are anchored at the pile heads of the seabed ground anchor piles in a centralized mode, and the upper ends of the carbon fiber wind-resistant cables are connected to the truss type stiffening girder in a scattered anchoring mode.
Preferably, carbon fiber anti-wind cable bury at ordinary times among the seabed slot, rarely meet super strong typhoon, pull carbon fiber anti-wind cable out of the sea, carbon fiber anti-wind cable drags tight truss-like stiffening girder, carries out the interim anti-wind reinforcement of super large span suspension bridge.
The construction method of the carbon fiber cable net wind-resistant reinforced structure system of the oversized span suspension bridge comprises the following steps:
the method comprises the following steps: selecting a bridge site of the oversized span suspension bridge, constructing a pile foundation bearing platform, constructing a four-limb column bridge tower with a parabolic arched tower cap, and constructing an anchorage structure;
step two: constructing large-diameter submarine anchor piles at the seabed, anchoring a certain number of carbon fiber wind-resistant cables at the pile heads of the submarine anchor piles in a centralized manner, and burying the carbon fiber wind-resistant cables in the seabed grooves;
step three: constructing a temporary construction catwalk, drawing a left parallel steel wire cable rope and a right parallel steel wire cable rope to be suspended between two four-limb column bridge towers with parabolic arch tower caps, anchoring the parallel steel wire cable ropes in an anchorage structure, installing a vertical steel wire suspension rod, and erecting a truss type stiffening girder to form an ultra-large span parallel cable rope suspension bridge;
step four: according to a hyperbolic paraboloid mathematical equation, a plurality of carbon fiber cables are arranged in a spatial cross mode to form a hyperbolic paraboloid carbon fiber space cable net, the drooping hyperbolic paraboloid carbon fiber space cable net covers the left and right two parallel steel wire cables, the hyperbolic paraboloid carbon fiber space cable net is suspended on a four-limb column bridge tower with a parabolic arch tower cap, and the hyperbolic paraboloid carbon fiber space cable net is divided into a left and a right two strands and is intensively anchored in the left and right two anchor structures;
step five: installing a parabolic steel structure curved beam, adopting a clamp to firmly connect a left parallel steel wire cable, a right parallel steel wire cable, a hyperbolic paraboloid carbon fiber space cable net and the parabolic steel structure curved beam, firmly connecting the upper end of an oblique carbon fiber suspender with the end part of the parabolic steel structure curved beam, and fixedly connecting the lower end of the oblique carbon fiber suspender with a truss type stiffening beam to form a space cable reinforcing system;
step six: installing an arched central buckle at a midspan section of the oversized span suspension bridge, improving the cooperative working capacity of a space cable reinforcement system and a truss type stiffening beam, installing a handrail and paving a bridge deck to form the oversized span suspension bridge of a hyperbolic paraboloid space mixed cable system, and putting the oversized span suspension bridge into operation;
step seven: after rare super typhoon forecast of meteorological satellites is known, channel traffic is closed, carbon fiber wind-resistant cables deeply buried in seabed grooves are taken out, the upper ends of the carbon fiber wind-resistant cables are dispersedly anchored and connected with truss type stiffening girders to form a temporary wind-resistant cable system, and the cable strait bridge with the ultra-large span space is temporarily reinforced to resist super strong typhoon disasters;
step eight: and after the super strong typhoon passes, removing the temporary wind-resistant cable system and recovering the channel traffic operation.
Reform tradition parallel steel wire cable suspension bridge, on the vertical load basis is undertaken to traditional two strands of parallel steel wire cables, increase a small amount of carbon fiber saddle paraboloid space cable net, can increase substantially suspension bridge's torsional rigidity and torsional frequency ratio, two sets of cables of parallel steel wire cable and hyperbolic paraboloid carbon fiber space cable are used mixedly, the advantage is complementary, the collaborative work, the anti-wind ability of super large-amplitude span suspension bridge has been strengthened by a wide margin, can the super large-amplitude span strait bridge anti-wind stability problem.
By using the anchor chain cable method of the large ship for reference, a plurality of anchor piles are driven into the sea bottom, the carbon fiber anchor chain cable is anchored at the pile heads of the anchor piles, the carbon fiber wind-resistant cable is deeply buried in a seabed groove and does not influence the operation of a navigation channel at ordinary times, after the super strong typhoon is forecasted, part or all of the temporary carbon fiber wind-resistant cable is started according to the grade of the super strong typhoon, the carbon fiber wind-resistant cable is quickly pulled to the bridge floor and is firmly fixed on the stiffening beam bridge floor, the wind resistance of the super large-span channel suspension bridge is further improved, the fact that the super strong typhoon does not slightly damage the super large-span channel suspension bridge is ensured, and therefore after the typhoon disaster, the fast repair, the traffic is recovered as soon as possible, and the rare super strong typhoon disaster is resisted.
Has the advantages that: the carbon fiber cable net wind-resistant reinforced structure system of the oversized span suspension bridge has the following beneficial effects:
at present, a hot tide for constructing a cross-sea island-connected bridge is raised at home and abroad, and in order to meet the navigation requirements of 2 ships of 80 ten thousand tons in order to avoid constructing a deep-sea deep-water foundation, a 5000-meter ultra-large span strait-sea suspension bridge is required to be constructed.
According to the current structural design and construction technology of the ultra-large span suspension bridge, the traditional parallel steel wire cable system suspension bridge can bear the vertical dead weight and the vehicle load of the 5000-meter ultra-large span suspension bridge, but the lateral rigidity and the torsional rigidity of the parallel cable system suspension bridge are poor, the flutter critical wind speed of the 5000-meter ultra-large span parallel cable system strait suspension bridge is only 30m/s, and the wind resistance stability design requirement of the 5000-meter ultra-large span strait suspension bridge cannot be met.
In order to improve the wind resistance stability of the 5000-meter ultra-large-span strait-supported bridge, a spatial cable system can be adopted for reinforcing and processing the parallel cable system-supported bridge, a hyperbolic paraboloid carbon fiber spatial cable net covers two parallel steel wire cables of the ultra-large-span strait-supported bridge, and the newly-added carbon fiber spatial cable net restrains the vertical anisotropic vibration of the two parallel cables, so that the torsional rigidity and the lateral rigidity of the ultra-large-span-supported bridge structure can be greatly improved, and the wind resistance stability of the 5000-meter ultra-large-span-supported bridge is greatly improved.
By using the spider web structure configuration for reference, on the basis of a suspension bridge of a parallel steel wire cable system, a bridge tower is changed into a four-limb column bridge tower with a parabolic arched tower cap, a hyperbolic paraboloid carbon fiber space cable net is additionally arranged, a plurality of carbon fiber cables are arranged in a spatial cross mode, space cable cross nodes are fixed, a parabolic steel structure curved beam is arranged, the parallel steel wire cable, the carbon fiber space cable net and the parabolic steel structure curved beam are connected together, a hyperbolic paraboloid space mixed cable net structure system is formed, and construction operation is simple and feasible.
A spatial mixed cable system is adopted for each gorge suspension bridge with the ultra-large span of 5000 meters, a parallel steel wire cable system bears vertical load, a hyperbolic paraboloid carbon fiber spatial cable net can improve the spatial rigidity of the ultra-large span suspension bridge, the torsion frequency and the torsion frequency ratio can be greatly improved, the flutter critical wind speed of the strage suspension bridge with the ultra-large span of 5000 meters is about 72m/s, and the wind resistance stability design requirement of the strage suspension bridge with the ultra-large span of 5000 meters can be basically met.
The global early-Nino phenomenon is aggravated, the typhoon intensity is continuously increased, a 5000-meter-level ultra-large span space hybrid cable strait suspension bridge is a century-old meter, the design of the 5000-meter-level ultra-large span strait suspension bridge needs to be well subjected to wind-resistant defense work for temporary reinforcement when encountering 18-level ultra-strong typhoons, the safety coefficient is 1.2 after considering the height correction coefficient of the basic wind speed and the gust coefficient is 1.19, and the test wind speed of the 5000-meter-level ultra-large span strait suspension bridge is about 105m/s (corresponding to the test wind speed of 18-level ultra-strong typhoons).
However, within 100 years of the design standard of the bridge, the oversized span suspension bridge encounters the super-strong typhoon only for several times, however, if the oversized span suspension bridge can resist the frequent super-strong typhoon for several times, the wind resistance design grade standard of the oversized span space cable strait-sea-island suspension bridge structure is greatly improved, the structure technology and the national economy are not practical, a large amount of manpower and material resources in the country are wasted, and the design is not necessary at all.
In view of the fact that the design and construction scheme of the suspension bridge of the 5000-meter-level ultra-large span suspension bridge for resisting 18-level strong typhoons is very difficult to realize and huge manpower and financial resources are wasted, the 5000-level ultra-large span strait-sea gorge suspension bridge structure can be designed according to resisting 15-level typhoons, once the structure meets more than 15-level typhoons, channel traffic is closed, a temporary wind-resistant cable reinforcing system is started, and the temporary carbon fiber wind-resistant cable reinforcing scheme is economical and reasonable.
Earthquake is a natural disaster which cannot be forecasted, rarely encounters super-strong typhoon, is a natural disaster which can be accurately forecasted by a meteorological satellite, and the fortification strategies for earthquake resistance and wind resistance are different.
Three-level fortification principle of structure earthquake-resistant design: the small earthquake is not damaged, the medium earthquake can be repaired, and the large earthquake is not fallen.
The design of a 5000-meter-level ultra-large span suspension bridge adopts a two-level fortification principle: the wind is not bad, and the temporary wind-resistant cable reinforcing system is started by strong wind.
At present, weather satellite technology for typhoon forecasting is developed, rarely meeting super strong typhoons can be forecasted for several days in advance completely, channel traffic is sealed before the strong typhoons reach, a 5000-meter-level ultra-large span suspension bridge enables a temporary carbon fiber wind-resistant cable reinforcing system, the ultra-large span suspension bridge is protected from stably and safely crossing over 15-level super strong typhoon disasters with short time of 2-3 days, the technology is feasible, and the scheme is economical and reasonable.
The construction method of the temporary wind-resistant cable reinforcing system comprises the following steps: the method comprises the steps of firstly constructing a submarine anchor cable pile, connecting a pile top with a carbon fiber temporary wind-resistant cable, burying the carbon fiber wind-resistant cable in a seabed groove at ordinary times, and not influencing the operation of a channel at ordinary times.
When super-strong typhoon atmospheric forecast is obtained, the carbon fiber wind-resistant cable is quickly pulled to the bridge floor, the two side edges of the stiffening beam are firmly pulled by the carbon fiber wind-resistant cable, the safety of the cable strait suspension bridge structure in the super-large span space is ensured, and the carbon fiber wind-resistant cable is pulled back to the original place of the seabed groove rarely after super-strong typhoons occur, so that traffic is recovered as soon as possible.
When the super strong typhoon of more than 15 grades is met, all temporary wind-resistant cable reinforcing systems are started, the full-bridge temporary carbon fiber wind-resistant cable is reinforced, and the safety of the cable strait-strait bridge structure in the ultra-large span space is ensured. To put it back, the 5000-meter-level oversized span suspension bridge meets about 12-15-level ultra-strong typhoon, temporary reinforcement and typhoon prevention measures are also made to avoid structural damage caused by the typhoon, and 12-15-level temporary wind-resistant cable reinforcing systems can be used for a small amount of wind-resistant cables, so that slight damage of the ultra-typhoon to the strait oversized span suspension bridge is avoided, and the traffic is quickly repaired and recovered as soon as possible after the typhoon disaster.
The system comprises a hyperbolic paraboloid carbon fiber cable space cable net wind-resistant reinforcing system and a temporary wind-resistant cable wind-resistant reinforcing system, wherein the two wind-resistant reinforcing systems are indispensable.
The hyperbolic paraboloid carbon fiber cable space cable net wind-resistant reinforcing system is a permanent wind-resistant reinforcing system, can resist medium-level typhoon disasters under the condition of not influencing channel traffic, and ensures that the Johnson strait bridge is normally used;
the temporary wind-resistant cable wind-resistant reinforcing system is a temporary wind-resistant reinforcing system, rarely meets super typhoon disasters under closed channel traffic, is economical and reasonable, is feasible in technology, and perfectly solves the problem of wind resistance stability of 5000 m-grade ultra-large span Johnson channel suspension bridge.
Drawings
FIG. 1 is a three-dimensional schematic view of a carbon fiber cable net wind-resistant reinforcing structure system of an ultra-large span suspension bridge;
FIG. 2 is a three-dimensional schematic view of the carbon fiber space cable reinforcement system of FIG. 1;
FIG. 3 is a three-dimensional schematic view of the temporary carbon fiber cable wind-resistive reinforcement system of FIG. 1;
FIG. 4 is a schematic construction process diagram of a carbon fiber cable net wind-resistant reinforcing structure system of an ultra-large span suspension bridge;
FIG. 5 is a three-dimensional schematic of a limb column pylon;
FIG. 6 is a schematic view of a hyperbolic paraboloid configuration;
the figure shows that: a four-limb column pylon 1; an anchorage structure 2; a parallel wire cable 3; a spatial cable reinforcement system 4; hyperbolic paraboloid carbon fiber space cable nets 41; a parabolic steel structural curved beam 42; a boom 5; a vertical steel wire boom 51;
an oblique carbon fiber boom 52; a truss-like stiffening girder 6; an arched central buckle 7; a temporary wind resistant cable reinforcement system 8;
a subsea ground anchor pile 81; carbon fiber wind resistance cable 82.
Detailed Description
The present invention will be further specifically described with reference to the accompanying drawings.
Example 1:
the invention discloses a carbon fiber cable net wind-resistant reinforcing structure system of an oversized span suspension bridge, which comprises a four-limb column bridge tower 1, an anchorage structure 2, a parallel steel wire cable 3, a space cable reinforcing system 4, a suspender 5, a truss type stiffening girder 6, an arch-shaped central buckle 7 and a temporary wind-resistant cable reinforcing system 8, and is characterized in that: the four-limb column bridge tower 1 with the parabolic arched tower cap is composed of a portal frame four-limb column, a parabolic arched tower cap and a tower cap supporting inclined column, a left and a right two pendulous parallel steel wire cables 3 are suspended between the two four-limb column bridge towers 1 with the parabolic arched tower caps, the left and the right two pendulous parallel steel wire cables 3 are anchored in an anchor structure 2, a space cable reinforcing system 4 is composed of a hyperbolic paraboloid carbon fiber space cable net 41 and a parabolic steel structure curved beam 42, the hyperbolic paraboloid carbon fiber space cable net 41 is formed by spatial crossing of a plurality of carbon fiber cables, the spatial configuration is a spatial cable net formed by the drooping hyperbolic paraboloid straight-line curved cable net, the hyperbolic paraboloid carbon fiber space cable net 41 covers the left and the right two parallel steel wire cables 3, the parabolic steel structure curved beam 42 is placed on a plurality of hyperbolic paraboloid carbon fiber space cable nets 41, the hyperbolic paraboloid carbon fiber space cable net 41 is divided into a left strand and a right strand which are intensively anchored in the left anchorage structure 2 and the right anchorage structure 2, and the parallel steel wire cable 3 and the hyperbolic paraboloid carbon fiber space cable net 41 are firmly connected with the parabolic steel structure curved beam 42 by adopting a clamp; the suspender 5 is divided into two groups, namely a vertical steel wire suspender 51 and an oblique carbon fiber suspender 52, the upper end of the vertical steel wire suspender 51 is connected with the parallel steel wire cable 3, the lower end of the vertical steel wire suspender is connected with the truss type stiffening girder 6, the upper end of the oblique carbon fiber suspender 52 is connected with the parabolic steel structure curved girder 42, the lower end of the oblique carbon fiber suspender is connected with the truss type stiffening girder 6, and a steel pipe concrete arch-shaped central buckle 7 is arranged in the middle area of the suspension bridge; the temporary wind-resistant cable reinforcing system 8 is composed of a submarine anchor pile 81 and carbon fiber wind-resistant cables 82, wherein pile heads of the submarine anchor pile 81 are anchored with a certain number of carbon fiber wind-resistant cables 82 in a centralized mode, and upper ends of the carbon fiber wind-resistant cables 82 are connected onto the truss type stiffening beams 6 in a dispersed anchoring mode.
The carbon fiber wind-resistant cable 82 is embedded in a seabed groove at ordinary times, when a super strong typhoon is rarely met, the carbon fiber wind-resistant cable 82 is pulled out of the sea surface, the carbon fiber wind-resistant cable 82 pulls the truss type stiffening girder 6 tightly, and temporary wind-resistant reinforcement of the oversized span suspension bridge is carried out.
Example 2:
the invention relates to a construction method of a carbon fiber cable net wind-resistant reinforced structure system of an oversized span suspension bridge, which comprises the following steps:
the method comprises the following steps: selecting a bridge site of the oversized span suspension bridge, constructing a pile foundation bearing platform, constructing a four-limb column bridge tower 1 with a parabolic arched tower cap, and constructing an anchorage structure 2;
step two: constructing large-diameter submarine ground anchor piles 81 at the seabed, anchoring a certain number of carbon fiber wind-resistant cables 82 at the pile heads of the submarine ground anchor piles 81 in a centralized manner, and burying the carbon fiber wind-resistant cables 82 in the seabed grooves;
step three: constructing a temporary construction catwalk, drawing a left parallel steel wire cable 3 and a right parallel steel wire cable 3 to be suspended between two four-limb column bridge towers 1 with parabolic arch tower caps, anchoring the parallel steel wire cables in an anchor structure 2, installing a vertical steel wire suspender 51, and erecting a truss type stiffening girder 6 to form an ultra-large span parallel cable suspension bridge;
step four: according to a hyperbolic paraboloid mathematical equation, a plurality of carbon fiber cables are arranged in a spatial cross mode to form a hyperbolic paraboloid carbon fiber space cable net 41, the drooping hyperbolic paraboloid carbon fiber space cable net 41 covers the left and right two parallel steel wire cables 3, the hyperbolic paraboloid carbon fiber space cable net 41 is suspended on a four-limb column bridge tower 1 with a parabolic arched tower cap, and the hyperbolic paraboloid carbon fiber space cable net 41 is divided into a left part and a right part which are intensively anchored in the left and right anchor structures 2;
step five: installing a parabolic steel structure curved beam 42, adopting a clamp to firmly connect the left and right parallel steel wire cables 3 and the hyperbolic paraboloid carbon fiber space cable net 41 with the parabolic steel structure curved beam 42, firmly connecting the upper end of an oblique carbon fiber suspender 52 with the end part of the parabolic steel structure curved beam 42, and fixedly connecting the lower end of the oblique carbon fiber suspender 52 with a truss type stiffening beam 6 to form a space cable reinforcing system 4;
step six: installing an arched central buckle 6 at a midspan section of the oversized span suspension bridge, improving the cooperative working capacity of the space cable reinforcement system 4 and the truss type stiffening girder 6, installing a handrail and paving a bridge deck to form the oversized span suspension bridge of the hyperbolic paraboloid space mixed cable system, and putting the oversized span suspension bridge into operation;
step seven: after learning the rare super typhoon forecast of meteorological satellites, closing channel traffic, taking out the carbon fiber wind-resistant cable 82 deeply buried in the seabed trench, dispersedly anchoring and connecting the upper end of the carbon fiber wind-resistant cable 82 with the truss type stiffening girder 6 to form a temporary wind-resistant cable system 8, temporarily reinforcing the cable strait bridge with the ultra-large span space, and resisting super strong typhoon disasters;
step eight: and after the super strong typhoon, the temporary wind-resistant cable system 8 is dismantled, and the channel traffic operation is recovered.
Example 3:
a single-span suspension bridge structure is adopted for a certain ultra-large-span strait suspension bridge, the main span is 5000 meters, the distance from an anchorage structure to a bridge tower is 1200 meters, the width of a bridge deck is 60 meters, two sides of the bridge deck are 4 unidirectional lanes of a highway part, the middle part of the bridge deck is a double-track railway, and in order to meet the requirement of wind resistance stability of the 5000-meter ultra-large-span suspension bridge, on the basis of a parallel steel wire cable system suspension bridge, a carbon fiber cable net wind resistance reinforcing structure system of the ultra-large-span suspension bridge is adopted to reinforce torsional rigidity and improve the critical flutter wind speed.
The herringbone bridge tower column of the four-limb column is in a structural form of a cylindrical bridge tower column in a grid tube type double-steel-plate concrete combined shear wall cylinder, a tie steel partition plate of a corrugated steel plate is arranged inside a grid tube type double-steel-plate concrete combined shear wall, the height of the herringbone bridge tower column is 600 meters, the central distance between two longitudinal legs of the herringbone bridge tower column is 240 meters, the central distance between the transverse bottoms of a left herringbone bridge tower column and a right herringbone bridge tower column is 180 meters, the cross-sectional structure size of the bridge tower column is a rectangular cross section of 25 multiplied by 25 meters to 20 multiplied by 20 meters in linear change, the wall thickness of the wall body of the combined shear wall is linearly changed by 2.5 meters to 2 meters, and C80 to C50 concrete in linear change is poured in the cross-sectional.
The top steel pipe concrete parabolic huge arch ring structure adopts a double-steel-plate concrete combined box-shaped arch ring structure, the span length of a parabolic arch ring is 240 meters, the rise height is 60 meters, the section size of the arch ring is a rectangle of 20 multiplied by 15 meters, the wall thickness of the box-shaped arch ring is 1.0 meter, C50 concrete is poured in the box-shaped arch ring, the lower part of the parabolic arch ring is provided with a huge rigid tie bar for welding a steel box girder, the section size is a rectangular section of 15 multiplied by 15 meters, and a prestressed high-strength steel wire rope of 16 phi 0.3 meters is arranged inside the parabolic arch ring.
The giant diagonal brace adopts a double-steel-plate concrete combined box type hollow column structure, the section size is a rectangle with the size of 15 multiplied by 15 meters, the thickness of the box type column wall is 0.8 meter, and C50 concrete is poured in the box type column wall.
The giant connecting beam adopts a double-steel-plate concrete combined box beam structure, the section size of the giant connecting beam is 15 multiplied by 15 meters, the wall thickness of the box-type continuous beam is 0.6 meter, and C50 concrete is poured in the box-type continuous beam.
The parallel steel wire cables adopt a prefabricated parallel strand method (PPWS method) process, the span of the bridge is 5000m, the vector-span ratio is 1/11, the parallel steel wire cables droop for 454.5 m, a 2000MPa high-strength steel wire cable finished product with the diameter of 5.2mm is adopted, six steel wire cables are arranged in a full bridge, three finished cables on the left side and the right side are bound together by adopting a triangular method, and the diameter of each main cable is 1.6 m.
The hyperbolic paraboloid cable net adopts 4000MPa high-strength carbon fiber cables, the full bridge is totally 18 carbon fiber hyperbolic paraboloid space cables, and the diameter of each carbon fiber main cable is 0.4 m.
The steel structure curved beam with the lower prestressed pull rod is arranged on the hyperbolic paraboloid cable net and the two parallel steel wire cables, the distance between the steel structure curved beams is 120 meters, the total number of the full bridges is 39, the steel structure curved beam adopts a steel box arch structure, the section size is 0.4 multiplied by 0.2 meter, the wall thickness of a steel plate is 25mm, and the lower prestressed pull rod adopts a left high-strength prestressed steel bar and a right high-strength prestressed steel bar with the diameter of 0.1m and 750 MPa.
The distance between the vertical steel wire suspension rods is 40 meters, the total number of the vertical steel wire suspension rods is 2 multiplied by 123, the steel wire sling adopts 1860MPa high-strength steel wire cables, and the diameter of the steel wire sling is 0.12m steel wire cables.
The two ends of the steel structure curved beam are provided with oblique carbon fiber suspenders connected with stiffening beams, the distance between the oblique carbon fiber suspenders is 120 meters, and the oblique carbon fiber suspenders adopt 4000MPa high-strength carbon fiber cables with the diameter of 0.12 meter, and total number of the oblique carbon fiber suspenders is 2 multiplied by 39.
The stiffening girder structure adopts steel truss formula stiffening girder, and the decking is local fretwork, and the bridge floor width is 60 meters, and the roof beam height of stiffening girder is 15 meters.
The middle area of suspension bridge sets up steel pipe concrete arch central authorities and detains to improve the full-bridge wholeness, reduce stiffening beam longitudinal displacement, the span of arch central authorities detain is 150 meters, and the rise is 30 meters, and the steel pipe preparation of 2 meters wall thickness 18mm of steel pipe diameter is interior to pour into C50 concrete.
The wind-resistant cable system comprises anchor cable piles and temporary wind-resistant cables, a set of temporary wind-resistant cable system is arranged at intervals of 750 meters in a 5000-meter-level space mixed cable strait-sea suspension bridge, three sets of temporary wind-resistant cable systems are arranged in a full bridge, each set of temporary wind-resistant cable system is provided with a left, a middle and a right three seabed anchor piles, the total number of the full bridge seabed anchor piles is nine, the seabed anchor piles adopt cast-in-situ bored piles with steel casing retaining walls, the diameter of the middle seabed anchor pile is 4 meters, the diameters of the seabed anchor piles on two sides are 3 meters, the length of each seabed anchor pile is 100 meters, the pile body concrete adopts C40, and the cross-shaped welded double H600-shaped steel is arranged inside the.
A group of 7 carbon fiber temporary wind-resistant cables with the diameter of 0.08 m are respectively installed on a left ground anchor cable pile and a right ground anchor cable pile, two groups of 14 carbon fiber temporary wind-resistant cables with the diameter of 0.08 m are installed on the middle ground anchor cable pile, four groups of carbon fiber temporary wind-resistant cables are arranged in an inverted W shape, the 7 carbon fiber temporary wind-resistant cables with the diameter of 0.08 m are respectively and dispersedly anchored and connected with the lower chord of a stiffening truss along the longitudinal direction of a bridge, and the temporary wind-resistant cable system provides vertical and lateral restraint for the stiffening truss so as to resist super typhoon disasters.
The carbon fiber wind-resistant cable is embedded into a seabed groove at ordinary times, after rare super-strong typhoon forecast of meteorological satellites is known, channel traffic is sealed, the carbon fiber wind-resistant cable deeply embedded in the seabed is taken out, the upper end of the carbon fiber wind-resistant cable is dispersedly anchored and connected with a truss type stiffening girder to form a temporary wind-resistant cable system, the cable strait-sea suspension bridge with the oversized span space is temporarily reinforced, and super-strong typhoon disasters are resisted.
Aiming at the design problem that a 5000 m-level ultra-large span Johnson state strait suspension bridge faces flutter wind resistance stability, a hyperbolic paraboloid carbon fiber cable space cable net wind resistance reinforcing system and a temporary wind resistance cable wind resistance reinforcing system are provided, and the two wind resistance reinforcing systems are indispensable to be lacked, wherein the hyperbolic paraboloid carbon fiber cable space cable net wind resistance reinforcing system is a permanent wind resistance reinforcing system, so that medium-level typhoon disasters can be resisted under the condition that channel traffic is not influenced, and normal use of the Johnson state strait bridge is ensured; the temporary wind-resistant cable wind-resistant reinforcing system is a temporary wind-resistant reinforcing system, rarely meets super typhoon disasters under closed channel traffic, is economical and reasonable, is feasible in technology, and perfectly solves the problem of wind resistance stability of 5000 m-grade ultra-large span Johnson channel suspension bridge.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (3)
1. The utility model provides a carbon fiber cable net wind-resistant reinforced structure system of super large span suspension bridge which characterized in that: the method is characterized in that: a four-limb column bridge tower (1) with a parabolic arched tower cap is composed of portal frame four-limb columns, parabolic arched tower caps and tower cap supporting inclined columns, a left and a right two pendulous parallel steel wire cables (3) are suspended between the two four-limb column bridge towers (1) with parabolic arched tower caps, the left and the right two pendulous parallel steel wire cables (3) are anchored in an anchor structure (2), a space cable reinforcing system (4) is composed of a hyperbolic paraboloid carbon fiber space cable net (41) and a parabolic steel structure curved beam (42), the hyperbolic paraboloid carbon fiber space cable net (41) is formed by space crossing of a plurality of carbon fiber cables, the space configuration is a space cable net formed by the hyperbolic paraboloid straight-line curved cable net, the hyperbolic carbon fiber space cable net (41) covers the left and the right parallel steel wire cables (3), a plurality of parabolic steel structure curved beams (42) are placed on the hyperbolic paraboloid carbon fiber space cable net (41), the hyperbolic paraboloid carbon fiber space cable net (41) is divided into a left strand and a right strand which are intensively anchored in the left anchor structure and the right anchor structure (2), and a parallel steel wire cable (3) and the hyperbolic paraboloid carbon fiber space cable net (41) are firmly connected with a parabolic steel structure curved beam (42) by adopting a clamp; the suspension rods (5) are divided into two groups, namely vertical steel wire suspension rods (51) and oblique carbon fiber suspension rods (52), the upper ends of the vertical steel wire suspension rods (51) are connected with parallel steel wire cables (3), the lower ends of the vertical steel wire suspension rods are connected with truss type stiffening girders (6), the upper ends of the oblique carbon fiber suspension rods (52) are connected with parabolic steel structure curved girders (42), the lower ends of the oblique carbon fiber suspension rods are connected with the truss type stiffening girders (6), and steel pipe concrete arch-shaped central buckles (7) are arranged in the middle area of a suspension bridge; the temporary wind-resistant cable reinforcing system (8) is composed of a seabed ground anchor pile (81) and carbon fiber wind-resistant cables (82), the pile heads of the seabed ground anchor pile (81) are intensively anchored with a certain amount of carbon fiber wind-resistant cables (82), and the upper ends of the carbon fiber wind-resistant cables (82) are dispersedly anchored and connected onto the truss type stiffening girder (6).
2. The carbon fiber cable net wind-resistant reinforced structural system of the ultra-large span suspension bridge according to claim 1, wherein: carbon fiber anti-wind cable (82) bury at ordinary times among the seabed slot, rarely meet super strong typhoon, pull carbon fiber anti-wind cable (82) and go out the sea, carbon fiber anti-wind cable (82) drag truss-like stiffening girder (6) tightly, carry out the interim anti-wind reinforcement of super large span suspension bridge.
3. The construction method of the carbon fiber cable net wind-resistant reinforced structure system of the ultra-large span suspension bridge according to claim 1, characterized by comprising the following steps:
the method comprises the following steps: selecting a bridge site of the oversized span suspension bridge, constructing a pile foundation bearing platform, constructing a four-limb column bridge tower (1) with a parabola arch-shaped tower cap, and constructing an anchorage structure (2);
step two: constructing large-diameter submarine ground anchor piles (81) at the seabed, anchoring a certain number of carbon fiber wind-resistant cables (82) at the pile heads of each submarine ground anchor pile (81) in a centralized manner, and burying the carbon fiber wind-resistant cables (82) in the seabed grooves;
step three: constructing a temporary construction catwalk, drawing a left parallel steel wire cable rope and a right parallel steel wire cable rope (3) to be suspended between two four-limb column bridge towers (1) with parabolic arch tower caps, anchoring the parallel steel wire cable ropes in an anchorage structure (2), installing a vertical steel wire suspender (51), and erecting a truss type stiffening girder (6) to form an ultra-large span parallel cable rope suspension bridge;
step four: according to a hyperbolic paraboloid mathematical equation, a plurality of carbon fiber cables are arranged in a spatial cross mode to form a hyperbolic paraboloid carbon fiber space cable net (41), the drooping hyperbolic paraboloid carbon fiber space cable net (41) covers the left and right parallel steel wire cables (3), the hyperbolic paraboloid carbon fiber space cable net (41) is suspended on a four-limb column bridge tower (1) with a parabolic arched tower cap, and the hyperbolic paraboloid carbon fiber space cable net (41) is divided into a left part and a right part which are integrally anchored in the left anchor structure and the right anchor structure (2);
step five: installing a parabolic steel structure curved beam (42), adopting a clamp to firmly connect a left parallel steel wire cable (3) and a right parallel steel wire cable (3) and a hyperbolic paraboloid carbon fiber space cable net (41) with the parabolic steel structure curved beam (42), firmly connecting the upper end of an oblique carbon fiber suspender (52) with the end part of the parabolic steel structure curved beam (42), and fixedly connecting the lower end of the oblique carbon fiber suspender (52) with a truss type stiffening beam (6) to form a space cable reinforcement system (4);
step six: installing an arched central buckle (6) at a midspan section of the oversized span suspension bridge, improving the cooperative working capacity of the space cable reinforcement system (4) and the truss type stiffening girder (6), installing a handrail and paving a bridge deck to form the oversized span suspension bridge of the hyperbolic paraboloid space mixed cable system, and putting the oversized span suspension bridge into operation;
step seven: after rare super typhoon forecast of meteorological satellites is known, the channel traffic is closed, the carbon fiber wind-resistant cable (82) deeply buried in the seabed trench is taken out, the upper end of the carbon fiber wind-resistant cable (82) is dispersedly anchored and connected with the truss type stiffening girder (6) to form a temporary wind-resistant cable system (8), the cable strait suspension bridge with the ultra-large span space is temporarily reinforced, and super strong typhoon disasters are resisted;
step eight: after the super strong typhoon, the temporary wind-resistant cable system (8) is dismantled, and the channel traffic operation is recovered.
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| CN114395981A (en) * | 2021-12-24 | 2022-04-26 | 湖南省中南桥梁安装工程有限公司 | Aerial facility combined by steel cable and building structure |
| US20230160159A1 (en) * | 2021-02-03 | 2023-05-25 | Dalian University Of Technology | Dangling net cloth device for suppressing flutter of sea-crossing bridge |
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