CN114086482B - Suspension bridge girder erection method - Google Patents
Suspension bridge girder erection method Download PDFInfo
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- CN114086482B CN114086482B CN202111522663.6A CN202111522663A CN114086482B CN 114086482 B CN114086482 B CN 114086482B CN 202111522663 A CN202111522663 A CN 202111522663A CN 114086482 B CN114086482 B CN 114086482B
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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
- E01D21/08—Methods or apparatus specially adapted for erecting or assembling bridges by rotational movement of the bridge or bridge sections
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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
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
Abstract
The invention relates to a method for erecting a suspension bridge steel beam, which comprises the following steps: symmetrically erecting the midspan girder segments section by section from midspan to two sides, and hinging adjacent midspan girder segments between the bridge decks of the upper layer; when the curvature of the bridge line shape of the erected midspan region reaches the curvature designed into the bridge line shape, rigidly connecting the erected midspan sections to form a whole; and the side-span side steel beams and the middle-span steel beams are closed by adjusting the postures of the steel beams which are positioned at the two sides and connected into a whole. According to the method for erecting the steel beam of the suspension bridge, which is designed by the invention, the installation stress in the steel beam erection process is reduced, the installation quality of the bridge is improved, meanwhile, the side span and the middle span steel beam section erection are separated, and the construction organization in a steel beam factory and a construction site can be optimized by reasonably setting the steel beam erection procedure, so that the construction work efficiency is improved.
Description
Technical Field
The invention relates to the field of bridge construction, in particular to a method for erecting a suspension bridge steel beam.
Background
Suspension bridges are often used in large-span bridges based on their excellent spanning ability. And because of the navigation requirement of crossing the water area, the steel beam cannot be erected in the water area by using a bracket method.
In order to facilitate transportation, the steel beam is often divided into a plurality of sections, and erection of the steel beam is completed by splicing the steel beam sections at a construction site.
Along with the development of the high-speed railway bridge Liang Dali in China, the bridge scale is continuously increased, and the weight of the steel girder segment is more than thousand tons. When the suspension bridge steel girder erection adopts a common method, namely the section-by-section erection and the section-by-section rigid connection are adopted, because the steel girder sections are still in a non-bridging state when the rigid frame is arranged, additional loads are required to be forcibly matched and connected in order to finish the rigid connection of the two sections, so that secondary internal force is generated between the steel girders, and the stress state of the bridge and the bridging line shape are influenced.
Disclosure of Invention
The embodiment of the invention provides a method for erecting a girder of a suspension bridge, which aims to solve the problem that in the related art, the girder segments are directly and rigidly connected to cause secondary internal force of the girder, so that the stress state and the bridge formation line shape of the bridge are affected.
In a first aspect, a method for erecting a suspension bridge steel beam is provided, comprising the steps of: hoisting the midspan sections to a preset position, connecting the midspan sections with a main cable, and hinging the upper deck of two adjacent midspan sections; when the curvature of the bridge line shape of the midspan region reaches the curvature of the bridge line shape, the adjacent midspan sections are rigidly connected to form a midspan steel beam; and adjusting the side span steel beams which are positioned at two sides of the middle span steel beam and are connected on the side span brackets into a whole, so that the side span steel beams are in closure and rigid connection with the middle span steel beam.
In some embodiments, the step of hoisting the midspan section to a preset position, connecting the midspan section with the main cable, and before hinging the upper deck of two adjacent midspan sections, comprises the following steps: when the main tower is constructed, the side span steel beams are erected synchronously through a bracket method.
In some embodiments, the step of hoisting the midspan section to a preset position, connecting the midspan section to the main cable, and hinging the upper deck of two adjacent midspan sections comprises the steps of: mounting the boom on the main cable; lifting a midspan section positioned at a midspan axis, and connecting the midspan section with a corresponding suspension rod, wherein the midspan axis is a vertical symmetry axis of a midspan steel beam along a longitudinal bridge direction; and sequentially and symmetrically lifting the midspan sections positioned at two sides of the midspan axis, connecting the midspan sections with corresponding suspenders, and hinging the upper deck of the two adjacent midspan sections.
In some embodiments, both ends of the midspan section at the midspan axis are provided with first rotating portions; one end of the other midspan section, which is close to the midspan axis, is provided with a second rotating part, and the other end is provided with a first rotating part; the first rotating part is provided with a first matching part, the first matching part is a groove or a bulge, and the second rotating part is provided with a second matching part matched with the first matching part.
In some embodiments, the step of hinging an upper deck of two adjacent midspan segments comprises the steps of: adjusting the midspan sections positioned on two sides of the midspan axis so that the second rotating parts of the midspan sections are positioned above the first rotating parts of the adjacent midspan sections; the first mating portion is mounted to the second mating portion such that two adjacent midspan segments are hinged.
In some embodiments, the step of adjusting the side span steel beams positioned on both sides of the midspan steel beam to enable the side span steel beam to be in closure and rigid connection with the midspan steel beam comprises the following steps: a three-way adjusting device is arranged between the side span steel beam and the lower supporting body; and the vertical, longitudinal and transverse bridge positions of the side span steel girder are adjusted through the three-way adjusting device, so that the side span steel girder and the middle span steel girder are closed.
In some embodiments, the adjusting the side span steel beams at two sides of the middle span steel beam, and closing and rigidly connecting the middle span steel beam and the side span steel beam, further comprises the following steps: when the side span steel beam and the middle span steel beam are closed, the side span steel beam is lifted by a cable-carrying crane on the main cable, and the position and the posture of the side span steel beam are adjusted in an auxiliary mode.
In some embodiments, when the curvature of the bridge line shape of the midspan region reaches the curvature designed into the bridge line shape, the erected midspan sections are rigidly connected to form a midspan steel beam, comprising the following steps of; and observing gaps between the lower bridge decks of the adjacent midspan sections, measuring the longitudinal bridge line shape of the upper bridge deck steel girder when the gaps between the two adjacent midspan sections are closed, and rigidly connecting the two adjacent midspan sections through high-strength bolts when the line curvature reaches the line curvature designed as a bridge line shape to form the midspan steel girder.
In some embodiments, the step of hoisting the midspan section to a preset position, connecting the midspan section with the main cable, and before hinging the upper deck of two adjacent midspan sections, comprises the following steps: installing a cable-carrying crane on the main cable, the cable-carrying crane being movable on the main cable; the midspan section is hoisted by the cable-hoist.
The technical scheme provided by the invention has the beneficial effects that:
the embodiment of the invention provides a quick erection method of a suspension bridge girder, because a midspan section is hoisted below a main cable and adjacent sections are connected through rotation, compared with the way of forcing two sections to be rigidly connected, the hinged mode reduces the installation stress of the two girder sections, and as the girder sections are gradually installed below the main cable, the girder sections can relatively rotate on the premise of hinging an upper deck bridge deck, finally, the bridge linear curvature of the adjacent girder sections naturally develops to the bridge linear curvature due to the stress change of the main cable, when the bridge linear curvature is reached, the two adjacent sections are rigidly connected, the connection theoretical stress is zero, the installation difficulty is reduced, the secondary internal force of the girder is avoided, and the bridge linear guarantee is facilitated. The hinged upper deck is convenient for the rotation of the adjacent midspan sections, and can also avoid the vertical height difference generated between the adjacent midspan section upper deck in the section installation process, thereby reducing the steel beam installation difficulty. The side span is erected and the middle span is erected mutually independently, the side span can be constructed before or during the assembly of the middle span sections, the construction period is shortened, the middle span is attached through adjusting the pose of the side span in the steel beam closure stage, the closure difficulty is reduced, the closure quality is improved, therefore, the installation stress in the steel beam erection process is reduced, the production quality of a bridge is improved, the side span is independently constructed with the middle span, the steel beam erection procedure can be reasonably set, the steel beam construction time is shortened, and the utilization rate of constructors and devices is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a method for erecting a suspension bridge girder according to an embodiment of the present invention;
FIG. 2 is a flowchart of step S1 in FIG. 1;
FIG. 3 is a schematic view of the structure during erection of a midspan steel beam;
FIG. 4 is an enlarged schematic view of FIG. 3A;
FIG. 5 is an enlarged schematic view of B in FIG. 4;
FIG. 6 is an enlarged schematic view of C in FIG. 4;
FIG. 7 is a schematic view of the structure of a midspan steel girder to be erected;
FIG. 8 is a schematic diagram of the structure of a midspan steel beam when the midspan steel beam is closed with a side span steel beam;
FIG. 9 is an enlarged schematic view of D in FIG. 8;
fig. 10 is a schematic view of the structure after the erection of the steel beam is completed.
In the figure:
1. a cable-carrying crane; 2. a main cable; 3. a boom; 4. a lap joint structure; 41. a first rotating part; 42. a second rotating part; 5. a lower end gap; 6. firstly hoisting the segment; 7. rear hoisting the segments; 8. a side span bracket; 9. a slip system; 10. a side span steel girder; 11. a main tower; 12. closing a closure opening; 13. a three-way adjusting device; 14. and (5) a support.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment of the invention provides a method for erecting a steel girder of a suspension bridge, which can solve the problems that in the related art, steel girder segments are directly and rigidly connected, the installation difficulty is increased, and meanwhile, secondary internal force of the steel girder is generated, so that the bridge formation shape of the steel girder is influenced.
Referring to fig. 1, a flow chart of a method for erecting a suspended cable bridge steel girder according to an embodiment of the present invention includes the following steps: s1: hoisting the midspan sections to a preset position, connecting the midspan sections with the main cable 2, and hinging the upper deck of two adjacent midspan sections; s2: rigidly connecting adjacent midspan sections to form a midspan steel beam; s3: the side span steel beams 10 positioned at the two sides of the middle span steel beam are adjusted to enable the side span steel beam 10 to be in closure and rigid connection with the middle span steel beam, the side span and middle span independent construction can be realized by dividing the middle span steel beam from the side span steel beam 10, the construction of the side span steel beam 10 can be carried out before and after the middle span steel beam is erected, the middle span section is a section steel beam of the middle span part and is not limited by a single procedure, the whole middle span part is difficult to directly hoist to a main cable due to the large span of the suspension bridge, the middle span is divided into a plurality of small middle span sections to facilitate the hoist to hoist, the installation of the steel beam sections is realized in the girder erection process by connecting the middle span sections with the main cable 2, the relative rotation between the adjacent middle span sections can be realized by hinging the upper layer bridge decks of the two adjacent middle span sections, wherein, because the hoisting process is not completed in one step, when the midspan sections are gradually hoisted on the main cable 2, the gaps of the adjacent midspan sections are gradually changed, the adjacent midspan sections are forcedly connected, the connecting positions can be caused to have connecting stress, the adjacent midspan sections are avoided to be misplaced by hinging at first until the linear curvature of the bridge in the midspan area reaches the designed linear curvature of the bridge, then the adjacent midspan sections are rigidly connected, the stress generated during rigid connection can be reduced, wherein the hinging position is arranged on the bridge deck at the upper layer, the method can accord with the curve change of the main cable 2 gradually hoisted on the midspan sections, the heights of the midspan sections at the two sides are gradually reduced, compared with the rule of hinging at other positions of the sections, the hinging of the bridge deck at the upper layer can avoid the interference or separation of the bridge deck at the upper layer in the rotating connection process, through setting up assorted rotation arch and rotation recess and realizing rotating the connection in adjacent segmental hookup location, in other embodiments, can realize rotating the connection through setting up the cooperation of axis of rotation and hole, after midspan segmental rigid connection forms the midspan girder steel, make midspan girder steel and side span girder steel 10 closure through adjusting side span girder steel 10, accomplish the erection of suspension bridge girder steel, because not directly with adjacent midspan girder steel rigid connection, can reduce the installation stress at the connection process of midspan, avoid influencing into bridge line shape, simultaneously because side span girder steel 10 and midspan girder steel construction mutually independent, can reasonably erect the girder steel according to the job site circumstances, can build side span girder steel 10 when articulated adjacent midspan segmental, also can build side span girder steel 10 at main tower 11 and build the in-process, improve the utilization ratio of field user and construction device.
Referring to fig. 1, in some embodiments, before S1, that is, before the midspan section is lifted to the preset position, the midspan section is connected to the main cable 2, and the upper deck of two adjacent midspan sections is hinged, the following steps may be included: when the main tower 11 is constructed, the side span steel beams 10 are synchronously erected through a bracket method, the midspan part of the suspension bridge is required to be installed on the main cable 2 of the main tower 11, the construction process of the main tower 11 is mostly concrete construction, the waiting time is long, when the main tower 11 is constructed, the side span steel beams 10 are synchronously erected, the construction time can be shortened, and the construction efficiency is improved.
Referring to fig. 2, in some alternative embodiments, in S1: hoisting the midspan sections to a preset position, connecting the midspan sections with the main cable 2, hinging the upper deck of two adjacent midspan sections, and can comprise the following steps: s101: the boom 3 is mounted on the main cable 2; s102: lifting a midspan section positioned at the midspan axis, and connecting the midspan section with a corresponding suspension rod 3, wherein the midspan axis is a vertical symmetry axis of the midspan along the longitudinal bridge direction; s103: the middle span sections positioned at two sides of the middle span axis are sequentially and symmetrically hoisted and connected with the corresponding hanging rods 3, the upper deck of the two adjacent middle span sections are hinged, the hanging rods 3 are arranged on the main cable 2 after the middle span sections are hoisted by the crane, and the hoisting and the installation of the middle span sections are synchronously realized, the midspan section of the midspan part is gradually arched from the concave until approaching the bridge-forming linear curvature, compared with the starting of hoisting the midspan section from two sides or other positions, the starting of hoisting the midspan section from the middle position of the midspan can enable the midspan part to approach the bridge-forming linear curvature more quickly, in the embodiment, the boom 3 at the side span steel beam 10 position can be disconnected with the side span steel beam 10 first, after the side span steel beam 10 is in closure with the midspan steel beam, the boom 3 of the side span steel beam 10 is connected with the corresponding steel beam section, in the embodiment, the boom 3 is required to be installed on the part section of the side span steel beam 10, and after the side span steel beam 10 is in closure and replaced to the support 14, the rest boom 3 can be connected with the side span steel beam 10.
Referring to fig. 3-6, in some alternative embodiments, both ends of the midspan section at the midspan axis may be provided with first rotating portions 41; one end of the other midspan section, which is close to the midspan axis, may be provided with a second rotating portion 42, and the other end may be provided with a first rotating portion 41; the first rotating portion 41 has a first mating portion, the first mating portion is a groove or a protrusion, the second rotating portion 42 has a second mating portion matched with the first mating portion, that is, the midspan section is hinged with the first rotating portion 41 through the second rotating portion 42, the midspan middle section is matched with the second rotating portion 42 of the midspan side section through the first rotating portions 41 at two ends, the end, close to the midspan axis, between the midspan side sections is determined through the position of the second rotating portion 42, of the midspan side section, assembly failure caused by error of the direction of the midspan section in the lifting process is avoided, in this embodiment, the second rotating portion 42 is provided with a circular protrusion, the first rotating portion 41 is provided with a groove matched with the circular protrusion, through the protrusion and the groove, the adjacent midspan section can be connected in a rotating manner, in other embodiments, the second rotating portion 42 can be provided with a groove, the first rotating portion 41 is provided with a corresponding protrusion, in addition, the second rotating portion 42 is provided with a circular groove and the protrusion with the axes are collinear but spaced from each other, and the first rotating portion is provided with a circular protrusion, which is matched with the adjacent midspan section in shape.
Referring to fig. 3 to 6, in some alternative embodiments, in S103, lifting the midspan sections located at both sides of the midspan axis in sequence and connecting with the corresponding boom 3 and hinging the upper deck of the two adjacent midspan sections may include the following steps: adjusting the midspan sections on both sides of the midspan axis so that the second rotating parts 42 thereof are positioned above the first rotating parts 41 of the adjacent midspan sections; the first matching part is installed on the second matching part, so that hinging of two adjacent midspan sections is finished, namely, the midspan section close to the midspan axis is lifted firstly, the midspan section close to the midspan axis is a first lifting section 6, the midspan section relatively far away from the midspan axis is a rear lifting section 7, the second rotating part 42 is located above the first rotating part 41 of the first lifting section 6 by adjusting the position of the rear lifting section 7, the second rotating part 42 is located above the first rotating part 41 relative to the moment of rotating connection of the two adjacent midspan sections, the height of the rear lifting section 7 relative to the first lifting section 6 is gradually reduced in the process of installing the midspan sections on the main cable 2, and the midspan section close to the midspan axis can transmit gravity to the first rotating part 41 through the second rotating part 42, so that the midspan section relatively far away from the midspan section relatively far from the midspan axis in the vertical direction can be prevented from being more tightly connected.
Referring to fig. 8-10, in some alternative embodiments, in S3: the step of adjusting the side span steel beams 10 located at both sides of the midspan steel beam so that the side span steel beams 10 are closed and rigidly connected with the midspan steel beam may include the steps of: a three-way adjusting device 13 is arranged between the side span steel beam 10 and the lower supporting body; the vertical, longitudinal and transverse bridge positions of the side span steel girder 10 are adjusted through the three-way adjusting device 13, so that the side span steel girder 10 is closed with the middle span steel girder, in this embodiment, the three-way adjusting device 13 can be formed by jacks with three mutually perpendicular directions, in other embodiments, the three-way adjusting device 13 can be provided with other mutually perpendicular telescopic adjusting devices, the three-way adjusting device 13 can be arranged on a lower cross beam of a main tower, an auxiliary pier or a side pier, the side span steel girder 10 is pushed by jacks with the three mutually perpendicular directions, the side span steel girder 10 is lifted, horizontally translated and the like through the side span steel girder 10, the positions and the corners of the side span steel girder 10 and the middle span steel girder are matched, when the two sides of the side span steel girder are matched, the steel girders at the two ends of the side span steel girder are rigidly connected through high-strength bolts, the whole closure of the steel girder is completed, and after the closure, the side span steel girder 10 is wholly replaced on the support 14 from the side span support 8 through the three-way adjusting device 13.
Referring to fig. 8-10, in some alternative embodiments, in S3: the side span steel beams 10 positioned at the two sides of the middle span steel beam are adjusted to enable the side span steel beams 10 to be in closure and rigid connection with the middle span steel beam, and the method further comprises the following steps: when the side span steel beam 10 and the middle span steel beam are closed, the side span steel beam 10 is lifted by the cable-mounted crane 1 on the main cable 2, namely, when the position of the side span steel beam 10 is adjusted by the three-way adjusting device 13, the position of the side span steel beam 10 can be adjusted by the cable-mounted crane 1 on the main cable 2 in an auxiliary manner, so that an upward lifting acting force is provided for the side span steel beam 10, and the adjustment difficulty of the three-way adjusting device 13 is reduced.
Referring to fig. 3-7, in some alternative embodiments, in S2: when the curvature of the bridge line shape of the midspan region reaches the curvature designed into the bridge line shape, the adjacent midspan sections are rigidly connected to form a midspan steel beam, and the method can further comprise the following steps: and when the gaps between the adjacent midspan sections are closed, namely the integral linear curvature of the upper deck reaches the linear curvature of the bridge, the upper chord members and the lower chord members of the adjacent midspan sections are respectively and rigidly connected through the high-strength bolts, in this embodiment, when the linear curvature of the adjacent midspan sections meets the rigid connection condition, namely the rigid connection of the adjacent midspan sections is realized, and when the gaps between the midspan sections meet the rigid connection, namely the linear curvature of the upper deck of the midspan sections reaches the linear curvature of the bridge, the rigid connection of the midspan sections is unified.
As shown in fig. 3 to 10, preferably, before S1, that is, before the midspan section is lifted to the preset position, the midspan section is connected to the main cable 2, and the upper deck of the two adjacent midspan sections is hinged, the following steps may be further included: a cable carrying crane 1 is arranged on a main cable 2, and the cable carrying crane 1 can move on the main cable 2; the midspan section is hoisted through the cable-mounted crane 1, that is to say, the cable-mounted crane 1 is mounted on the main cable 2, the cable-mounted crane 1 can hoist related components along the erection direction of the main cable 2, the midspan section is hoisted through the cable-mounted crane 1, on one hand, compared with a floating crane or other cranes, the midspan section is mounted on the main cable 2, the working space of constructors is less, on the other hand, the moving track is fixed, compared with other cranes, the operation is simpler, the hoisting components are always positioned under the main cable 2 more accurately, in the embodiment, each section of the steel beam is firstly mounted into a bridge wire shape during factory production to manufacture a whole splicing jig, a first section is spliced through the whole splicing jig, the subsequent sections are spliced through the adjacent section ports and the jig, and the matching degree of each section port is ensured.
The suspension bridge steel girder erection method provided by the embodiment of the invention comprises the following principles:
because the adjacent midspan sections are hinged, namely the position relation between the adjacent midspan sections is restrained, the connection sub-stress caused by direct forced rigid connection of the midspan sections is avoided, the quality problem of the suspension bridge is reduced, wherein only the upper deck is hinged, the position relation of the upper deck can be ensured, the rotation between the adjacent midspan sections is not hindered, when the bridge line in the midspan area meets the bridge line shape, the midspan sections are rigidly connected, the direct rigid connection stress is reduced, meanwhile, only the midspan part is hinged, the side span part can select the erection method according to the actual construction condition, namely the erection of the side span steel girder 10 is independent of the erection of the midspan steel girder, different construction requirements can be met through the adjustment of the working procedure sequence, and the erection of the suspension bridge steel girder is more compact, and the construction period is shortened.
In the description of the present invention, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element in question must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present invention. Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
It should be noted that in the present invention, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is only a specific embodiment of the invention to enable those skilled in the art to understand or practice the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. The method for erecting the suspension bridge steel beam is characterized by comprising the following steps of:
hoisting the midspan sections to a preset position, connecting the midspan sections with a main cable (2), and hinging the upper deck of two adjacent midspan sections;
when the curvature of the bridge line shape of the middle span region reaches the curvature designed into the bridge line shape, the erected middle span sections are rigidly connected to form a middle span steel beam;
adjusting side span steel beams (10) positioned at two sides of the middle span steel beam, and enabling the side span steel beams (10) to be in closure and rigid connection with the middle span steel beam;
hoisting the midspan sections to a preset position, connecting the midspan sections with a main cable (2), and hinging the upper deck of two adjacent midspan sections, wherein the method comprises the following steps:
the suspender (3) is arranged on the main cable (2);
lifting a midspan section positioned at a midspan axis, and connecting the midspan section with a corresponding boom (3), wherein the midspan axis is a vertical symmetry axis of the midspan steel girder along the longitudinal bridge direction;
the midspan sections positioned on two sides of the midspan axis are sequentially and symmetrically hoisted, are connected with the corresponding hanging rods (3), and the upper deck of the two adjacent midspan sections is hinged;
two ends of the midspan section at the midspan axis are provided with first rotating parts (41);
one end of the other midspan section, which is close to the midspan axis, is provided with a second rotating part (42), and the other end is provided with a first rotating part (41);
the first rotating part (41) is provided with a first matching part which is a groove or a bulge, and the second rotating part (42) is provided with a second matching part matched with the first matching part;
adjusting the midspan sections on both sides of the midspan axis so that the second rotating parts (42) thereof are positioned above the first rotating parts (41) of the adjacent midspan sections;
and installing the first matching part on the second matching part, so that two adjacent midspan sections are hinged, and continuous transition of bridge decks on all the erected sections is realized.
2. A method of erecting a suspension bridge girder according to claim 1, wherein said hoisting the midspan sections to a predetermined position, connecting the midspan sections to the main cable (2), and before hinging the upper deck of the adjacent two midspan sections, comprising the steps of:
when the main tower (11) is constructed, the side span steel beams (10) are synchronously erected through a bracket method.
3. A method of erecting a suspension bridge girder according to claim 1, wherein the step of adjusting side span girders (10) located on both sides of the midspan girder so that the side span girders (10) are in closure and rigid connection with the midspan girder comprises the steps of:
a three-way adjusting device (13) is arranged between the side span steel beam (10) and the lower supporting body;
the vertical, longitudinal and transverse bridge positions of the side span steel girder (10) are adjusted through the three-way adjusting device (13), so that the side span steel girder (10) and the middle span steel girder are closed.
4. A method of erecting a suspension bridge girder according to claim 1, wherein said step of adjusting side span girders (10) located on both sides of the midspan girder to allow the side span girders (10) to be in close and rigid connection with the midspan girder further comprises the steps of:
when the side span steel beam (10) and the middle span steel beam are closed, the side span steel beam (10) is lifted by the cable-carrying crane (1) on the main cable (2), and the position and the posture of the side span steel beam (10) are adjusted in an auxiliary mode.
5. The method of erecting a suspension bridge girder according to claim 1, wherein when the curvature of the bridge line shape of the midspan region reaches the curvature designed in the bridge line shape, adjacent midspan sections are rigidly connected to form a midspan girder, comprising the steps of;
and observing gaps between the lower bridge decks of the adjacent midspan sections, measuring the longitudinal bridge line shape of the upper bridge deck steel girder when the gaps between the two adjacent midspan sections are closed, and rigidly connecting the two adjacent midspan sections through high-strength bolts when the line curvature reaches the line curvature designed as a bridge line shape to form the midspan steel girder.
6. A method of erecting a suspension bridge girder according to claim 1, wherein said hoisting the midspan sections to a predetermined position, connecting the midspan sections to the main cable (2), and before hinging the upper deck of the adjacent two midspan sections, comprising the steps of:
-mounting a cable jack (1) on the main cable (2), the cable jack (1) being movable on the main cable (2);
-hoisting the midspan section by means of the cable-carrying crane (1).
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