CN111705623A - Arch steel pipe central buckle structure of oversized span suspension bridge - Google Patents
Arch steel pipe central buckle structure of oversized span suspension bridge Download PDFInfo
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- CN111705623A CN111705623A CN202010683559.4A CN202010683559A CN111705623A CN 111705623 A CN111705623 A CN 111705623A CN 202010683559 A CN202010683559 A CN 202010683559A CN 111705623 A CN111705623 A CN 111705623A
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- steel pipe
- cable
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- cable fastener
- suspension bridge
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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
- E01D11/00—Suspension or cable-stayed bridges
- E01D11/02—Suspension bridges
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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
- E01D19/14—Towers; Anchors ; Connection of cables to bridge parts; Saddle supports
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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
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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
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
Arch steel pipe central authorities are detained including cable fastener, steel connection plate and arch steel pipe etc. and cable fastener tightly holds and wraps up in the main push-towing rope, and the steel connection plate is welded under cable fastener, controls two arch steel pipes and is located the both sides of steel connection plate, and both welded connection of top and cable fastener and steel connection plate of arch steel pipe, arch steel pipe bottom anchor are on stiffening beam, and the hoist cable upper end hangs under steel connection plate, and the stiffening beam is suspended in midair to the hoist cable lower extreme. The oversized span suspension bridge is provided with the central buckle of the arched steel pipe, so that the cooperative work of the bridge deck stiffening beam and the suspension bridge main cable can be ensured, the longitudinal rigidity of the suspension bridge is enhanced, the longitudinal seismic displacement of the suspension bridge is reduced, the antisymmetric torsion frequency of the oversized span suspension bridge can be greatly improved, and the seismic dynamic response of a suspension bridge tower can be obviously reduced. The arch-shaped steel pipe central buckle structure is rigid and flexible, and has the advantages of beautiful shape, convenient construction, reliable stress, good earthquake-resistant ductility, low manufacturing cost and the like. Can be used as a central buckle structure of an ultra-large span suspension bridge.
Description
Technical Field
The invention belongs to the field of bridge engineering, relates to a central buckle structure of a suspension bridge, and particularly relates to an arch steel pipe central buckle structure of an oversized span suspension bridge.
Background
Along with the increasing span of the suspension bridge, the longitudinal seismic displacement of the suspension bridge structure is increasing, and the longitudinal drift problem of the suspension bridge structure is increasingly prominent.
At present, a central buckle structure mainly has two forms, one is a rigid central buckle, namely a rigid triangular truss is used for combining a main cable and a stiffening beam; the other is a flexible central buckle, namely a pair or three pairs of inclined slings are used for establishing longitudinal restraint between the cable and the stiffening beam, and the flexible central buckle is more squinted for designers due to the convenience of construction.
The rigid central buckle is firmly stressed, but the construction is difficult, and the stress fatigue damage problem of a main cable and a main beam of the rigid central buckle suspension bridge is more prominent in rare strong shock.
The flexible central buckle is convenient to construct, but because the flexible central buckle cable is only pulled and is not stressed, when a strong shock is rarely encountered, the longitudinal seismic displacement is large, and the flexible central buckle cable can break and fail.
In a high-intensity earthquake area, the adoption of a rigid central buckle or a flexible central buckle of the oversized span suspension bridge is not proper, so that the stress of a main beam and the stress of a central buckle component are greatly increased and even damaged, and therefore, the central buckle structure of the oversized span suspension bridge needs to be improved.
In a high-intensity earthquake area, the central buckling structure of the oversized span suspension bridge is a rigid and flexible central buckling structure, an arched steel pipe structure with excellent anti-seismic performance can be utilized, and the arched steel pipe structure is connected with a cable fastener to form the arched steel pipe central buckling structure of the oversized span suspension bridge. The cable fastener tightly wraps the main cable, the connecting steel plate is welded right below the cable fastener, the left and right arched steel pipes are located on two sides of the connecting steel plate, the top of each arched steel pipe is welded with the cable fastener and the connecting steel plate, the bottom of each arched steel pipe is anchored on the stiffening beam, and the central buckle structure of each arched steel pipe has the advantages of attractive appearance, convenience in construction, reliability in stress, strong anti-seismic energy consumption capability, low price and the like.
Disclosure of Invention
The purpose of the invention is as follows: the invention provides an arch steel pipe central buckling structure of an oversized span suspension bridge, which has the advantages of beautiful shape, convenient construction, reliable stress, strong anti-seismic energy consumption capability and low price.
The technical scheme is as follows: in order to solve the technical problem, the invention provides an arch steel pipe central buckle structure of an oversized span suspension bridge, which comprises a cable buckle, a connecting steel plate and an arch steel pipe, and is characterized in that: the cable fastener tightly wraps the main cable, the steel plate is welded under the cable fastener, the left arched steel pipe and the right arched steel pipe are located on two sides of the connecting steel plate, the top of each arched steel pipe is welded with the cable fastener and the connecting steel plate, the bottom of each arched steel pipe is anchored on the stiffening beam, the upper end of the sling is suspended below the connecting steel plate, and the lower end of the sling is suspended on the stiffening beam.
Preferably, the cable fastener is composed of an A-type cable fastener, a B-type cable fastener and a connecting bolt, wherein the A-type cable fastener in an omega shape is arranged at the upper part of the main cable; the B-shaped cable fastener in the shape of the inverted omega is arranged at the lower part of the main cable, and double rows of connecting bolts are arranged between the A-shaped cable fastener and the B-shaped cable fastener.
The invention discloses a construction method of an arch steel pipe central buckle structure of an oversized span suspension bridge, which is characterized by comprising the following steps of:
the method comprises the following steps: selecting a field of the suspension bridge with the oversized span, building an anchorage and a bridge tower foundation, performing bridge tower structure construction, performing temporary catwalk construction, performing main cable installation construction of the suspension bridge, installing a sling, and hoisting a bridge deck stiffening girder in sections until the full bridge deck is folded;
step two: arranging two temporary cable clamps at the left and right sides of the midspan position of a main cable of the suspension bridge, installing two temporary suspension cables, and dismantling the original suspension cables at the midspan position;
step three: firmly welding an inverted omega-shaped B-shaped cable fastener in the cable fastener with a connecting steel plate to form a whole;
step four: at the midspan, placing an A-shaped cable fastener in an omega shape on the main cable, placing a B-shaped cable fastener in an inverted omega shape below the main cable, fastening the A-shaped cable fastener and the B-shaped cable fastener together, screwing the two rows of connecting bolts to form a cable fastener, and tightly wrapping the main cable by the cable fastener;
step five: the arched steel pipes are welded and assembled in sections, the bottoms of the left arched steel pipe and the right arched steel pipe are anchored on the stiffening beam, and the tops of the left arched steel pipe and the right arched steel pipe are welded and connected with the cable fastener and the connecting steel plate to form an arched steel pipe central buckle structure;
step six: the arch-shaped steel pipe central buckling structure is installed on the other side of the midspan bridge floor, then the steel pipe central buckling structures on the left side and the right side of the midspan bridge are continuously completed, the full bridge forms a pair or three pairs of steel pipe central buckling structures, the railings are installed, the asphalt concrete bridge floor is paved, and the ultra-large span suspension bridge is operated and used.
The cable fastener is connected with the arch steel pipe to form an arch steel pipe central buckle of the large-span suspension bridge, so that the bridge deck stiffening girder and a suspension bridge main cable can be guaranteed to work cooperatively, the arch steel pipe central buckle structure is attractive and elegant, the construction is simple and convenient, the structure is economical and reasonable, and the arch steel pipe central buckle structure is rigid and flexible and has good ductility and energy consumption capability.
The suspension bridge is a flexible structure, and the arch steel pipe central buckle structure is arranged to couple the cable and the bridge deck stiffening girder, so that the integrity of the suspension bridge structure is enhanced, the longitudinal rigidity of the suspension bridge structure is enhanced, the longitudinal seismic displacement of the suspension bridge structure is reduced, the anti-symmetric torsion frequency of the ultra-large span suspension bridge can be improved, and the wind resistance stability of the ultra-large span suspension bridge structure is improved.
Has the advantages that: compared with the prior art, the invention has the following advantages:
the existing rigid central buckle is difficult to construct, and the problem of stress fatigue damage of a main cable and a main beam of a rigid central buckle suspension bridge is prominent when a strong shock is rarely encountered.
The existing flexible central buckle is convenient to construct, but because the flexible central buckle cable is only pulled and is not stressed, when a rare strong shock occurs, the longitudinal seismic displacement is large, and the flexible central buckle cable can break and fail.
In a high-intensity earthquake area, the longitudinal earthquake displacement of the oversized span suspension bridge structure is large, so that the stress of a main beam or a central buckle cable is greatly increased and even damaged, and therefore, the oversized span suspension bridge structure needs to develop a rigid and flexible central buckle structure, can improve the stress performance of a short sling, and is very important for prolonging the service life of the suspension bridge and saving the operation and maintenance cost of the bridge.
The bottom of the arch-shaped steel pipe central buckle structure is fixed on a bridge deck stiffening girder, the cable buckle is connected with the arch-shaped steel pipe, the arch-shaped steel pipe central buckle is rigid and flexible, the hysteresis curve of the arch-shaped steel pipe central buckle is full under the action of low-cycle repeated load, the ductility and the energy consumption are good, the problem of stress fatigue damage of a main cable and a main girder cannot be caused in a high-intensity earthquake area, the problem of fracture failure of the arch-shaped steel pipe cannot be caused, and the arch-shaped steel pipe central buckle has good earthquake resistance.
The bottom of the arch steel pipe central buckle is fixed on the bridge deck stiffening girder, the bridge deck stiffening girder is used as a tie bar of the arch steel pipe, the arch steel pipe central buckle and the bridge deck stiffening girder are combined to form a tie bar arch structure, and the tie bar arch structure is firm, so that the bridge deck stiffening girder and a main cable of a suspension bridge can be guaranteed to work cooperatively.
The arch steel pipe central buckle couples the cable and the bridge deck stiffening girder, thereby strengthening the longitudinal rigidity of the suspension bridge structure, reducing the longitudinal seismic displacement of the suspension bridge structure and avoiding the suspension bridge structure from longitudinal drift.
The central buckle of the arch-shaped steel pipe is arranged, so that the antisymmetric torsion frequency of the oversized span suspension bridge can be greatly improved, and the wind resistance stability of the oversized span suspension bridge structure is improved.
The center buckle of the arched steel pipe enhances the structural integrity of the oversized span suspension bridge, so that the seismic power response of the tower structure of the oversized span suspension bridge can be remarkably reduced in rare earthquakes, and the structural performance of the high-rise tower of the oversized span suspension bridge is improved.
The suspension bridge main cable is a concave curve member, the arch steel pipe is a convex curve member, the front curve member and the back curve member are combined together, and the arch steel pipe central buckle structure is attractive and elegant in shape.
The lower parts of the left and right arched steel pipes are fixed on a bridge deck stiffening beam, the top parts of the left and right arched steel pipes are firmly welded with the cable fastener and the connecting steel plate, the stress is reliable, the structure is economical and reasonable, and the construction is convenient.
The arch-shaped steel pipe central buckle has the advantages of beautiful shape, convenient construction, reliable stress, earthquake resistance, energy consumption and low price, and can be used as a central buckle structure of an oversized span suspension bridge in a high-intensity earthquake area.
Drawings
FIG. 1 is a schematic elevation view of a center buckle structure of an arch-shaped steel pipe;
FIG. 2 is a cross-sectional schematic view of the cable fastener of FIG. 1;
FIG. 3 is a three-dimensional schematic view of a center buckle structure of an arch-shaped steel pipe;
fig. 4 is a three-dimensional schematic view of an oversized span suspension bridge with arch-shaped steel pipe center buckles.
In the figure: a cable fastener 1; an A-type cable fastener 11; a type B cable fastener 12; double rows of connecting bolts 13; connecting a steel plate 2; an arch-shaped steel pipe 3; a main cable 4; a sling 5; a stiffening beam 6.
Detailed Description
The invention will be further explained with reference to the drawings.
Example 1
The utility model provides an arch steel pipe central authorities of super large span suspension bridge detains structure, includes cable fastener 1, hitch plate 2 and arch steel pipe 3, its characterized in that: the main rope 4 is tightly held and wrapped up in to cable fastener 1, and two arch steel pipes 3 are located the both sides of linking steel plate 2 about cable fastener 1's the welded connection steel plate 2 under, and arch steel pipe 3's top and cable fastener 1 and linking steel plate 2 both welded connection, 3 bottom anchor of arch steel pipe are on stiffening beam 6, and 5 upper ends of hoist cable hang under linking steel plate 2, and 5 lower extremes of hoist cable hang stiffening beam 6 in midair.
The cable fastener 1 is composed of an A-type cable fastener 11, a B-type cable fastener 12 and a connecting bolt 13, wherein the A-type cable fastener 11 in an omega shape is arranged at the upper part of the main cable 4; the B-type cable fastener 12 of the reverse omega shape is provided at the lower portion of the main cable 4, and a double row of connecting bolts 13 is provided between the a-type cable fastener 11 and the B-type cable fastener 12.
Example 2
The invention discloses a construction method of an arch steel pipe central buckle structure of an oversized span suspension bridge, which is characterized by comprising the following steps of:
the method comprises the following steps: selecting a field of the suspension bridge with the oversized span, building an anchor and a bridge tower foundation, performing bridge tower structure construction, performing temporary catwalk construction, performing installation construction on a main cable 4 of the suspension bridge, installing a sling 5, and hoisting a bridge deck stiffening girder 6 in sections until the full bridge deck is folded;
step two: arranging two temporary cable clamps at the left and right sides of the span of a main cable 4 of the suspension bridge, installing two temporary suspension cables 5, and dismantling the original suspension cables 5 at the span center;
step three: firmly welding an inverted omega-shaped B-shaped cable fastener 12 in the cable fastener 1 with a connecting steel plate 2 to form a whole;
step four: at the midspan, an A-shaped cable fastener 11 in an omega shape is placed on the main cable 4, a B-shaped cable fastener 12 in an inverted omega shape is placed under the main cable 4, the A-shaped cable fastener and the B-shaped cable fastener are fastened together, double rows of connecting bolts 13 are screwed, a cable fastener 1 is formed, and the cable fastener 1 tightly wraps the main cable 4;
step five: the arched steel pipes 3 are welded and assembled in sections, the bottoms of the left arched steel pipe 3 and the right arched steel pipe 3 are anchored on the stiffening beam 6, and the tops of the left arched steel pipe 3 and the right arched steel pipe 3 are welded and connected with the cable fastener 1 and the connecting steel plate 2 to form an arched steel pipe central buckle structure;
step six: the arch-shaped steel pipe central buckling structure is installed on the other side of the midspan bridge floor, then the steel pipe central buckling structures on the left side and the right side of the midspan bridge are continuously completed, the full bridge forms a pair or three pairs of steel pipe central buckling structures, the railings are installed, the asphalt concrete bridge floor is paved, and the ultra-large span suspension bridge is operated and used.
Example 3
A bridge deck main beam is a steel truss stiffening girder structure, the diameter of a main cable is 900mm, the distance between slings is 40 meters, and an arch steel pipe central buckle structure is adopted in order to improve the longitudinal rigidity of the oversized span suspension bridge structure.
The length of the cable fastener is 10 meters, the A-shaped cable fastener in the omega shape and the B-shaped cable fastener in the inverted omega shape clamp the steel wire main cable, the two omega-shaped cable fasteners are both formed by casting, the wall thickness of the cable fastener is 40mm, the diameter of the connecting bolt is 28mm, and the distance between the two rows of connecting bolts is 330 mm.
The lengths of the left arched steel pipe and the right arched steel pipe are 120 meters, the rise is 20 meters, the rise-span ratio is 1/6, the diameter of each steel pipe is 1000mm, and the wall thickness of each steel pipe is 20 mm.
The connecting steel plate is welded under the cable fastener, the length of the connecting steel plate is 10 meters, the connecting steel plate is rectangular and arc-shaped, and the thickness of the connecting steel plate is 40 mm.
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 an arch steel pipe central authorities of suspension bridge are striden to super large stride constructs, includes cable fastener (1), hitch plate (2) and arch steel pipe (3), its characterized in that: the main rope (4) is tightly wrapped up in cable fastener (1), welded connection steel sheet (2) under cable fastener (1), control two arch steel pipes (3) and be located the both sides of connecting steel sheet (2), the top and cable fastener (1) and both welded connection of connecting steel sheet (2) of arch steel pipe (3), arch steel pipe (3) bottom anchor is on stiffening beam (6), hoist cable (5) upper end hangs under connecting steel sheet (2), stiffening beam (6) is suspended in midair to hoist cable (5) lower extreme.
2. The arch-shaped steel pipe central buckle structure of the ultra-large span suspension bridge of claim 1, wherein: the cable fastener (1) is composed of an A-type cable fastener (11), a B-type cable fastener (12) and a connecting bolt (13), wherein the A-type cable fastener (11) in an omega shape is arranged at the upper part of the main cable (4); the B-shaped cable fastener (12) in the shape of an inverted omega is arranged at the lower part of the main cable (4), and a double-row connecting bolt (13) is arranged between the A-shaped cable fastener (11) and the B-shaped cable fastener (12).
3. The construction method of the arch-shaped steel pipe central buckle structure of the ultra-large span suspension bridge, as recited in claim 1, is characterized by comprising the following steps:
the method comprises the following steps: selecting a field of the suspension bridge with the oversized span, building an anchor and a bridge tower foundation, carrying out bridge tower structure construction, carrying out temporary catwalk construction, carrying out installation construction on a main cable (4) of the suspension bridge, installing a sling (5), and hoisting a bridge deck stiffening girder (6) in sections until the full bridge deck is folded;
step two: arranging two temporary cable clamps at the left and right sides of the midspan of a main cable (4) of the suspension bridge, installing two temporary slings (5), and dismantling the original slings (5) at the midspan position;
step three: firmly welding an inverted omega-shaped B-shaped cable fastener (12) in the cable fastener (1) and a connecting steel plate (2) to form a whole;
step four: at the midspan, an A-shaped cable fastener (11) in an omega shape is placed on a main cable (4), a B-shaped cable fastener (12) in an inverted omega shape is placed under the main cable (4), the A-shaped cable fastener and the B-shaped cable fastener are fastened together, double rows of connecting bolts (13) are screwed, a cable fastener (1) is formed, and the cable fastener (1) is tightly wrapped around the main cable (4);
step five: the arch steel pipes (3) are welded and assembled in sections, the bottoms of the left arch steel pipe (3) and the right arch steel pipe (3) are anchored on the stiffening beam (6), and the tops of the left arch steel pipe (3) and the right arch steel pipe (3) are welded and connected with the cable fastener (1) and the connecting steel plate (2) to form an arch steel pipe central buckle structure;
step six: the arch-shaped steel pipe central buckling structure is installed on the other side of the midspan bridge floor, then the steel pipe central buckling structures on the left side and the right side of the midspan bridge are continuously completed, the full bridge forms a pair or three pairs of steel pipe central buckling structures, the railings are installed, the asphalt concrete bridge floor is paved, and the ultra-large span suspension bridge is operated and used.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010683559.4A CN111705623A (en) | 2020-07-15 | 2020-07-15 | Arch steel pipe central buckle structure of oversized span suspension bridge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010683559.4A CN111705623A (en) | 2020-07-15 | 2020-07-15 | Arch steel pipe central buckle structure of oversized span suspension bridge |
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| CN111705623A true CN111705623A (en) | 2020-09-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010683559.4A Pending CN111705623A (en) | 2020-07-15 | 2020-07-15 | Arch steel pipe central buckle structure of oversized span suspension bridge |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113322809A (en) * | 2021-06-16 | 2021-08-31 | 同济大学 | Double-working-state easy-recovery type suspension bridge central buckle suitable for strong earthquake area |
| CN113356026A (en) * | 2021-06-16 | 2021-09-07 | 同济大学 | Sacrificial central buckle damping system |
-
2020
- 2020-07-15 CN CN202010683559.4A patent/CN111705623A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113322809A (en) * | 2021-06-16 | 2021-08-31 | 同济大学 | Double-working-state easy-recovery type suspension bridge central buckle suitable for strong earthquake area |
| CN113356026A (en) * | 2021-06-16 | 2021-09-07 | 同济大学 | Sacrificial central buckle damping system |
| CN113322809B (en) * | 2021-06-16 | 2022-03-08 | 同济大学 | Double-working-state easy-recovery type suspension bridge central buckle suitable for strong earthquake area |
| CN113356026B (en) * | 2021-06-16 | 2022-05-13 | 同济大学 | Sacrificial central buckle damping system |
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