CN113846563B - Construction method for side span and auxiliary span steel truss girder erection of large-span cable-stayed bridge - Google Patents
Construction method for side span and auxiliary span steel truss girder erection of large-span cable-stayed bridge Download PDFInfo
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- CN113846563B CN113846563B CN202111117960.2A CN202111117960A CN113846563B CN 113846563 B CN113846563 B CN 113846563B CN 202111117960 A CN202111117960 A CN 202111117960A CN 113846563 B CN113846563 B CN 113846563B
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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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- 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
- E01D11/04—Cable-stayed 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
Abstract
The construction method comprises the steps that during construction of a main tower pier, a main tower pier side bracket is arranged beside the main tower pier, a pushing system is arranged at the top of the main tower pier side bracket, steel guide beams are assembled section by section at the top of the main tower pier side bracket by using hoisting equipment of the main tower pier, and a beam erecting crane is assembled at the top of the steel guide beams; the steel truss girder segment lifted by the girder erection crane is butted with the steel guide girder; and after the girder erection crane and the pushing system complete the butt joint and pushing circulation of one steel truss girder segment, preparing the butt joint and pushing circulation of the next steel truss girder segment until the steel truss girder is butt jointed and pushed to the pier top of the auxiliary pier and the side pier. The construction method adopts the construction method of whole-section hoisting and pushing construction operation, transfers the traditional field welding assembly to the steel beam processing base for assembly, improves the welding quality of the steel beam, reduces the field steel beam welding workload, and shortens the construction time.
Description
Technical Field
The application relates to the technical field of cable-stayed bridge construction, in particular to a construction method for erecting a side span and an auxiliary span steel truss girder of a large-span cable-stayed bridge, which is suitable for the construction of the side span and the auxiliary span steel truss girder erection of the steel truss girder cable-stayed bridge with higher steel girder distance from a river surface, no navigation of the side span and the auxiliary span and no entrance of large-scale floating crane equipment.
Background
With the improvement of the technical capability of bridges, the trend of grand bridges crossing rivers, lakes and seas is more and more obvious. For the erection of the side span and the auxiliary span steel beam of the steel truss cable-stayed bridge, the first conventional scheme is that a pier top section is assembled on the side of the main span by using a large floating crane on a pier-side bracket, then a beam erecting crane is assembled on the pier top section, double-cantilever erection is performed by using the beam erecting crane, and the side pier and the auxiliary pier-top steel beam section are hoisted to the pier-side bracket by using the floating crane. The second conventional scheme is that main piers, side piers and auxiliary piers are provided with pier-side brackets, longitudinal moving devices are arranged on the pier-side brackets, the steel guide beams, steel beams and girder erection cranes are assembled by using floating cranes, side spans and auxiliary span steel trusses are assembled by using girder erection cranes in a scattered mode, and the side spans and the auxiliary span steel trusses are gradually pushed to the designed positions.
For both of the above conventional construction methods: firstly, floating crane resources need to be occupied for a long time, and the equipment use cost is high; and the conventional girder erection crane is used for assembling the steel truss girder rod piece in bulk, so that the requirement on the construction precision is high, the construction period is long, and the relative cost is increased. Therefore, a construction method which can eliminate the need for floating crane equipment and reduce the work of assembling the steel trusses on site for the construction of the side span steel trusses is urgently needed.
Disclosure of Invention
The embodiment of the application provides a construction method for erecting a side span and an auxiliary span steel truss girder of a large-span cable-stayed bridge, and aims to solve the problems of low construction efficiency and high construction cost of the side span and the auxiliary span steel girder erection in the related technology.
The embodiment of the application provides a construction method for erecting a side span and an auxiliary span steel truss of a large-span cable-stayed bridge, which comprises the following steps:
during the construction of the main tower pier, arranging a main tower pier side bracket beside the main tower pier, arranging a pushing system at the top of the main tower pier side bracket, assembling steel guide beams section by section at the top of the main tower pier side bracket by using hoisting equipment of the main tower pier, and assembling a beam erecting crane at the top of the steel guide beams;
the pushing system pushes the steel guide beam and the girder erection crane to the side span side to a designated position, then a counterweight platform and a counterweight block are arranged at the front end of the steel guide beam, and the girder erection crane lifts the steel truss girder section to be butted with the steel guide beam;
the pushing system pushes the steel guide beam and the erecting crane to a side span side to a specified position, and the erecting crane moves forwards to the specified position to the main span side at the same time, and then removes a balancing weight with the weight of 1/2 of the weight of the front end of the steel guide beam;
the pushing system pushes the steel guide beam and the girder erection crane to the side span side again to the designated position, and simultaneously, after the girder erection crane moves forward to the designated position to the main span side, the girder erection crane is used for hoisting the steel truss girder segment again to be in butt joint with the spliced steel truss girder;
the pushing system pushes the steel guide beam and the beam erecting crane to the side span side for the third time to the designated position, and simultaneously, the beam erecting crane moves forwards to the designated position towards the main span side, and then the counterweight block at the front end of the steel guide beam is completely removed;
and after the girder erection crane and the pushing system complete the butt joint and pushing circulation of one steel truss girder segment, preparing the butt joint and pushing circulation of the next steel truss girder segment until the steel truss girder is butt jointed and pushed to the pier top of the auxiliary pier and the side pier.
In some embodiments: and in the steel guide beam assembling process, the assembled steel guide beam and the beam erecting crane longitudinally move back and forth by utilizing a pushing system on a bracket beside the pier of the main tower pier.
In some embodiments: the side of the auxiliary pier is provided with an auxiliary pier side bracket, the top of the auxiliary pier side bracket is provided with a jacking system, the side of the side pier is provided with a side pier side bracket, and the top of the side pier side bracket is provided with a slide way beam, a slide block and a jacking unit.
In some embodiments: the jacking system comprises a slide beam, a tensioning jack, a steel strand, a sliding block and a jacking unit, wherein the tensioning jack is connected with the sliding block through the steel strand, the sliding block is connected to the top of the slide beam in a sliding mode, the tensioning jack can be arranged at the end portions of the two sides of the slide beam as required, and the jacking unit is fixed at the end portions of the two sides of the slide beam.
In some embodiments: in the assembling process of the steel guide beam, the distance between the sliding blocks arranged on the lower chord of the steel guide beam is adjusted from the length between single sections to the length between double sections according to requirements, and a longitudinal connecting rod is arranged between two longitudinally adjacent sliding blocks so as to enable the sliding blocks to move synchronously.
In some embodiments: the balancing weight is composed of a plurality of concrete blocks or metal blocks.
The beneficial effect that technical scheme that this application provided brought includes:
the embodiment of the application provides a construction method for erecting a side span and an auxiliary span steel truss girder of a large-span cable-stayed bridge, and the construction method is characterized in that a main tower pier side bracket is arranged beside a main tower pier during the construction of the main tower pier, a main tower pier side bracket is arranged beside the main tower pier during the construction of the main tower pier, a pushing system is arranged at the top of the main tower pier side bracket, steel guide beams are assembled on the top of the main tower pier side bracket section by using hoisting equipment of the main tower pier, and a beam erecting crane is assembled on the top of the steel guide beams; the pushing system pushes the steel guide beam and the girder erection crane to the side span side to a designated position, then a counterweight platform and a counterweight block are arranged at the front end of the steel guide beam, and the girder erection crane lifts the steel truss girder section to be butted with the steel guide beam; the pushing system pushes the steel guide beam and the erecting crane to a side span side to a specified position, and the erecting crane moves forwards to the specified position to the main span side at the same time, and then removes a balancing weight with the weight of 1/2 of the weight of the front end of the steel guide beam; the pushing system pushes the steel guide beam and the girder erection crane to the side span side again to the designated position, and simultaneously, after the girder erection crane moves forward to the designated position to the main span side, the girder erection crane is used for hoisting the steel truss girder segment again to be in butt joint with the spliced steel truss girder; the pushing system pushes the steel guide beam and the girder erection crane to the side span side for the third time to an appointed position, and simultaneously, the girder erection crane moves forwards to the main span side to the appointed position and then completely removes a balancing weight at the front end of the steel guide beam; and after the girder erection crane and the pushing system complete the butt joint and pushing circulation of one steel truss girder segment, preparing the butt joint and pushing circulation of the next steel truss girder segment until the steel truss girder is butt jointed and pushed to the pier top of the auxiliary pier and the side pier.
Therefore, the construction method uses the existing tower crane on site to assemble the steel guide beam structure on the main tower pier, and then assembles the girder erection crane structure on the steel guide beam. And then, hoisting the head section steel truss girder section by using the whole section of the assembled girder erection crane, and butting the head section steel truss girder section with the assembled steel guide girder. And finally, gradually pushing the steel trussed beams of the side span and the auxiliary span to a designed position by utilizing pushing systems on the main tower pier and the auxiliary pier. The construction method fully utilizes the existing hoisting equipment on site, and effectively saves the cost of large-scale floating crane equipment. Meanwhile, the construction method of the cross operation of the main tower pier and the steel truss girder is adopted, the steel truss girder erection work can be performed during the construction period of the main tower pier, and the construction period is effectively shortened. In addition, the construction method adopts the construction method of whole-section hoisting and pushing construction operation, steel truss girder sections do not need to be welded and assembled on the construction site, and the steel truss girder sections are transferred to a steel girder processing base to be assembled, so that the welding quality of the steel truss girder is improved, the welding workload of the steel truss girder on the site is reduced, and the construction time is shortened.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic structural view of a frame rail crane according to an embodiment of the present application;
fig. 2 to 6 are schematic structural diagrams of step 1 according to an embodiment of the present application;
FIG. 7 is a schematic structural diagram of step 2 in the embodiment of the present application;
FIG. 8 is a schematic structural diagram of step 3 in the embodiment of the present application;
FIG. 9 is a schematic structural diagram of step 4 in the embodiment of the present application;
FIG. 10 is a schematic structural diagram of step 5 in the embodiment of the present application;
FIG. 11 is a schematic view of the structure in step 6 of the embodiment of the present application;
FIG. 12 is a schematic view of the structure in step 7 of the embodiment of the present application;
FIG. 13 is a schematic structural diagram of step 8 according to the embodiment of the present application;
FIG. 14 is a schematic structural diagram of step 9 according to the embodiment of the present application;
fig. 15 is a schematic structural view of a pushing system according to an embodiment of the present application.
Reference numerals:
1. a main tower pier; 2. a main tower pier side bracket; 3. a pushing system; 4. spliced steel trusses; 5. a steel guide beam; 6. a beam erecting crane; 7. a counterweight block; 8. temporarily upsetting; 9. auxiliary piers; 10. side piers; 11. a pier-side bracket of the auxiliary pier; 12. a pier side bracket of the side pier; 13. a jacking unit; 15. a slideway beam; 16. tensioning a jack; 17. steel strand wires; 18. a slider; 401. part of the steel guide beam sections and the steel truss beam sections; 402. a second section of steel truss girder segment; 403. a third section of steel truss girder section; 404. the remaining steel truss beam sections.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The embodiment of the application provides a construction method for erecting side spans and auxiliary steel trusses of a large-span cable-stayed bridge, which can solve the problems of low construction efficiency and high construction cost of side span and auxiliary steel truss erection in the related technology.
The embodiment of the application provides a construction method for erecting a side span and an auxiliary span steel truss of a large-span cable-stayed bridge, which comprises the following steps:
Hoisting equipment (not shown in the figure) beside the main tower pier 1 is used for hoisting the first section of the steel guide beam 5 and is placed at the top of the bracket 2 beside the main tower pier, a rod piece of a beam erecting crane 6 is assembled at the top of the first section of the steel guide beam 5 by the hoisting equipment, and the hoisting equipment is preferably a tower crane beside the main tower pier 1.
And integrally moving the first section of the assembled steel guide beam 5 and the rod piece of the beam erecting crane 6 to the side span side by a section length by using the pushing system 3, hoisting the second section of the steel guide beam 5 by using hoisting equipment beside the main tower pier 1, and splicing the second section of the steel guide beam 5 and the first section into a whole.
The rod pieces of the girder erection crane 6 are continuously assembled at the tops of the first section and the second section of the steel guide beam 5 by using the hoisting equipment, and in the assembling process of the steel guide beam 5, the assembled steel guide beam 5 and the girder erection crane 6 are longitudinally moved back and forth by using the pushing system 3 on the main tower pier side bracket 2 so as to meet the requirement that the hoisting distance of the hoisting equipment is within a safe range.
And the pushing system 3 is utilized to integrally move the first section and the second section of the steel guide beam 5 and the rod piece of the frame beam crane 6 to the side span side by a section length, and hoisting equipment is utilized to continuously assemble the rod piece of the frame beam crane 6 at the tops of the first section and the second section of the steel guide beam 5 to complete the assembly of the main structure of the frame beam crane 6.
The pushing system 3 is utilized to integrally move the first section and the second section of the steel guide beam 5 and the main structure of the beam erecting crane 6 to the main span side by two sections; the counterweight platform for hoisting the triangular section of the steel guide beam 5 by using the hoisting equipment is integrally spliced with the side span side of the first section, the counterweight 7 is installed on the counterweight platform of the triangular section by using the hoisting equipment, and the lifting appliance is installed on the main body structure of the girder erection crane 6 after the installation of the counterweight 7 is completed.
The balancing weight 7 is composed of a plurality of concrete blocks or metal blocks, the weight of the balancing weight 7 is determined according to the balance state of the steel guide beam 5 and the girder erection crane 6 at the side bracket 2 of the main tower pier so as to prevent the steel guide beam 5 and the girder erection crane 6 from overturning when the girder erection crane 6 is used for hoisting the steel truss girder segment, shorten the length of the steel guide beam 5 and reduce the steel consumption of the steel guide beam 5.
And 2, as shown in fig. 7, hoisting a part of the steel guide girder segments of the head section and the steel truss girder segments 401 by using the girder erection crane 6 to be butted with the steel guide girder 5.
And 4, referring to fig. 9, using a pushing system 3 on a main tower pier side bracket 2 to longitudinally move the steel guide beam 5, the girder erection crane 6, part of the steel guide beam sections and the steel truss beam sections 401 to the side span side for a set length in the 2 nd time, moving the girder erection crane 6 to the main span side for a set length, integrally hoisting the second steel truss beam section 402 by using the girder erection crane 6, and butting the second steel truss beam section with the spliced steel truss beam 4.
And 6, referring to fig. 11, the steel guide beam 5, the girder erection crane 6 and the spliced steel truss girder 4 move longitudinally to the side span side for 4 th time by using the pushing-up system 3 on the main tower pier side bracket 2 for a set length, the girder erection crane 6 moves forward to the main span side for a set length, and the girder erection crane 6 is used for integrally hoisting the third section of steel truss girder segment 403 and is butted with the spliced steel truss girder 4.
And 9, as shown in the figure 14, removing all rod pieces of the steel guide beam 5 by using a crane near the side pier bracket 12, integrally jacking by using the vertical jacks on the main tower pier side bracket 2, the temporary pier 8 and the side pier 10, locking and then installing a permanent support, and dropping the spliced steel truss girder 4 to a designed position to complete the erection of the side span and the auxiliary span steel girder.
The construction method of the embodiment of the application utilizes the existing tower crane on site to assemble the steel guide beam 5 structure on the main tower pier 1, and then assembles the beam erecting crane 6 structure on the steel guide beam 5. And then, using the assembled whole section of the girder erection crane 6 to lift part of the steel guide girder sections and the steel truss girder sections 401, and butting the steel guide girder sections and the assembled steel guide girder 5. And finally, gradually pushing the steel trussed beams of the side span and the auxiliary span to a designed position by utilizing the pushing systems 3 on the main tower pier 1 and the auxiliary pier 9.
The construction method provided by the embodiment of the application makes full use of the existing hoisting equipment on site, and effectively saves the cost of large-scale floating crane equipment. Meanwhile, the construction method of the cross operation of the main tower pier 1 and the steel truss girder is adopted, the erection work of the steel truss girder can be carried out during the construction period of the main tower pier 1, and the construction period is effectively shortened.
In addition, the construction method adopts the construction method of whole-section hoisting and pushing construction operation, steel truss girder sections do not need to be welded and assembled on the construction site, and the steel truss girder sections are transferred to a steel girder processing base to be assembled, so that the welding quality of the steel truss girder is improved, the welding workload of the steel truss girder on the site is reduced, and the construction time is shortened.
In some alternative embodiments: referring to fig. 7 to 15, in the construction method for erecting the side span and the auxiliary span steel truss of the large-span cable-stayed bridge according to the embodiment of the present application, one or more groups of temporary piers 8 are arranged between the main tower pier 1 and the auxiliary pier 9 at intervals, and the specific number of the temporary piers 8 is specifically set according to the distance between the main tower pier 1 and the auxiliary pier 9.
And arranging a slideway beam 15 for supporting the steel truss girder, a sliding block 18 and a jacking unit 13 on the pier top of the temporary pier 8, wherein the jacking unit 13 is preferably a vertical jack. The sliding block 18 is arranged on the slideway beam 15 to support the spliced steel truss beam 4 to move towards the side span side, and the jacking unit 13 is used for jacking the spliced steel truss beam 4 upwards to enable the sliding block 18 to move to the initial position to prepare for the next jacking construction of the spliced steel truss beam 4.
The embodiment of the application has the advantages that the temporary piers 8 are arranged between the main tower pier 1 and the auxiliary pier 9 at intervals, the temporary pier 8 of the embodiment is provided with one temporary pier, and the temporary pier 8 is located at 1/2 of the distance between the main tower pier 1 and the auxiliary pier 9. The temporary pier 8 provides temporary support for the spliced steel truss girder 4 to move towards the side span side so as to ensure the stability of the structure when the spliced steel truss girder 4 moves towards the side span side.
In some alternative embodiments: referring to fig. 7 to 15, the embodiment of the present application provides a construction method for erecting a side span and an auxiliary span steel truss of a large-span cable-stayed bridge, where an auxiliary pier-side bracket 11 is disposed beside an auxiliary pier 9, the auxiliary pier-side brackets 11 are symmetrically disposed on two sides of the auxiliary pier 9 along a longitudinal direction, a jacking system 3 is disposed on the top of the auxiliary pier-side bracket 11, and the jacking system 3 on the top of the auxiliary pier-side bracket 11 is used to cooperate with the jacking system 3 on the top of the main tower pier-side bracket 2 to synchronously cooperate with jacking construction operation on a spliced steel truss 4, so as to ensure that the spliced steel truss 4 can be smoothly pushed to the side span.
Side pier side brackets 12 are arranged beside the side piers 10, the side pier side brackets 12 are symmetrically arranged on two sides of the side piers 10 along the longitudinal bridge direction, and a slide way beam 15, a slide block 18 and a jacking unit 13 are arranged at the tops of the side pier side brackets 12. The sliding block 18 on the top of the pier side bracket 12 of the side pier is arranged on the slideway beam 15 to support the spliced steel truss girder 4 to move towards the side span side, and the jacking unit 13 is used for jacking the spliced steel truss girder 4 upwards to move the sliding block 18 to the initial position to prepare for the next jacking construction of the spliced steel truss girder 4.
Principle of operation
The embodiment of the application provides a construction method for erecting a side span and an auxiliary span steel truss of a large-span cable-stayed bridge, and the construction method is characterized in that a main tower pier side bracket 2 is arranged beside a main tower pier 1 during the construction of the main tower pier, the main tower pier side bracket 2 is arranged beside the main tower pier 1 during the construction of the main tower pier 1, a jacking system 3 is arranged at the top of the main tower pier side bracket 2, steel guide beams 5 are assembled on the top of the main tower pier side bracket 2 section by using hoisting equipment of the main tower pier 1, and a beam erecting crane 6 is assembled on the top of the steel guide beams 5; the pushing system 3 pushes the steel guide beam 5 and the girder erection crane 6 to the side span side to the designated position, then a counterweight platform and a counterweight 7 are arranged at the front end of the steel guide beam 5, and the girder erection crane 6 butts the steel truss girder segment with the steel guide beam 5; the pushing system 3 pushes the steel guide beam 5, the steel truss girder segment and the girder erection crane 6 to a side span side to a designated position, and meanwhile, the girder erection crane 6 moves forwards to the main span side to the designated position, and then a counterweight 7 with the weight of 1/2 of that of the front end of the steel guide beam 5 is removed; the pushing system 3 pushes the steel guide beam 5 and the girder erection crane 6 to the side span side again to the designated position, and simultaneously the girder erection crane 6 moves forward to the designated position to the main span side, and then the girder erection crane 6 is used for hoisting the steel truss girder segment again to be butted with the spliced steel truss girder 4; the pushing system 3 pushes the steel guide beam 5 and the girder erection crane 6 to the side span side for the third time to a specified position, and simultaneously, the girder erection crane 6 moves forwards to the specified position from the main span side, and then a balancing weight 7 at the front end of the steel guide beam 5 is completely removed; after the girder erection crane 6 and the pushing system 3 complete the butt joint and pushing cycle of one steel truss girder section, the butt joint and pushing cycle of the next steel truss girder section is prepared until the spliced steel truss girder 4 is butt jointed and pushed to the top of the auxiliary pier 9 and the side pier 10.
The construction method fully utilizes the existing hoisting equipment on site, and effectively saves the cost of large-scale floating crane equipment. Meanwhile, the construction method of the cross operation of the main tower pier 1 and the steel truss girder is adopted, the erection work of the steel truss girder can be carried out during the construction period of the main tower pier 1, and the construction period is effectively shortened. In addition, the construction method adopts the construction method of whole-section hoisting and pushing construction operation, steel truss girder sections do not need to be welded and assembled on the construction site, and the steel truss girder sections are transferred to a steel girder processing base to be assembled, so that the welding quality of the steel truss girder is improved, the welding workload of the steel truss girder on the site is reduced, and the construction time is shortened.
In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It is noted that, in the present application, 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. Also, 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 phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. 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 application. Thus, the present application 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. A construction method for side span and auxiliary span steel truss girder erection of a large-span cable-stayed bridge is characterized by comprising the following steps:
during the construction of the main tower pier (1), arranging a main tower pier side bracket (2) beside the main tower pier (1), arranging a pushing system (3) at the top of the main tower pier side bracket (2), assembling steel guide beams (5) section by section at the top of the main tower pier side bracket (2) by using hoisting equipment of the main tower pier (1), and assembling a beam erecting crane (6) at the top of the steel guide beams (5);
the pushing system (3) pushes the steel guide beam (5) and the girder erection crane (6) to the side span side to a specified position, then a counterweight platform and a counterweight block (7) are arranged at the front end of the steel guide beam (5), and the girder erection crane (6) lifts the steel truss beam section to be in butt joint with the steel guide beam (5);
the pushing system (3) pushes the steel guide beam (5) and the beam erecting crane (6) to the side span side to a designated position, and meanwhile, the beam erecting crane (6) moves forwards to the designated position to the main span side, and then a counterweight (7) with the weight of 1/2 of the front end of the steel guide beam (5) is removed;
the pushing system (3) pushes the steel guide beam (5) and the girder erection crane (6) to the side span side again to the designated position, and meanwhile, after the girder erection crane (6) moves forward to the designated position to the main span side, the girder erection crane (6) is used for hoisting the steel truss girder segment again to be in butt joint with the spliced steel truss girder (4);
the pushing system (3) pushes the steel guide beam (5) and the beam erecting crane (6) to the side span side for the third time to an appointed position, and simultaneously, the beam erecting crane (6) completely removes a balancing weight (7) at the front end of the steel guide beam (5) after moving forward to the appointed position from the main span side;
after the girder erection crane (6) and the pushing system (3) complete the butt joint and pushing circulation of one steel truss girder section, the butt joint and pushing circulation of the next steel truss girder section is prepared until the spliced steel truss girder (4) is butt jointed and pushed to the pier top of the auxiliary pier (9) and the side pier (10).
2. The construction method for erecting the side span and the auxiliary span steel truss girder of the large-span cable-stayed bridge according to claim 1, which is characterized in that:
in the assembling process of the steel guide beam (5), the assembled steel guide beam (5) and the beam erecting crane (6) longitudinally move back and forth by utilizing the pushing system (3) on the main tower pier side bracket (2).
3. The construction method for erecting the side span and the auxiliary span steel truss girder of the large-span cable-stayed bridge according to claim 1, which is characterized in that:
the side of supplementary mound (9) sets up supplementary mound pier side bracket (11), sets up thrusting system (3) at the top of supplementary mound pier side bracket (11), side mound (10) side sets up side mound pier side bracket (12), sets up slide roof beam (15), slider (18) and jacking unit (13) at the top of side mound pier side bracket (12).
4. The construction method for erecting the side span and the auxiliary span steel truss girder of the large-span cable-stayed bridge according to claim 3, characterized in that:
jacking system (3) include slide roof beam (15), jack-knifing (16), steel strand wires (17), slider (18) and jacking unit (13), jack-knifing (16) are connected with slider (18) through steel strand wires (17), slider (18) sliding connection be in the top of slide roof beam (15), jack-knifing (16) can set up the both sides tip at slide roof beam (15) as required, jacking unit (13) are fixed at the both sides tip of slide roof beam (15).
5. The construction method for erecting the side span and the auxiliary span steel truss girder of the large-span cable-stayed bridge according to claim 4, characterized in that:
in the assembling process of the steel guide beam (5), the distance between the sliding blocks (18) arranged on the lower chord of the steel guide beam (5) is adjusted to the length between two sections from the length between single sections according to requirements, and a longitudinal connecting rod is arranged between two longitudinally adjacent sliding blocks (18) so as to enable the sliding blocks (18) to synchronously move.
6. The construction method for erecting the side span and the auxiliary span steel truss girder of the large-span cable-stayed bridge according to claim 1, which is characterized in that:
the balancing weight (7) is composed of a plurality of concrete blocks or metal blocks.
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| CN114250712A (en) * | 2021-12-31 | 2022-03-29 | 中建桥梁有限公司 | Method for erecting cable-stayed bridge steel truss beam by asymmetric bracket |
| CN115305835B (en) * | 2022-08-15 | 2023-07-11 | 中铁九桥工程有限公司 | Construction method for erecting double-section whole-section steel truss girder by using girder erecting crane |
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| CN104480862B (en) * | 2014-12-03 | 2016-04-20 | 中铁大桥局集团有限公司 | A kind of erection method of cable stayed bridge end bay steel truss girder |
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