CN111188273A - Large-section steel truss girder erection system of large-span steel-concrete composite bridge and construction method - Google Patents
Large-section steel truss girder erection system of large-span steel-concrete composite bridge and construction method Download PDFInfo
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- CN111188273A CN111188273A CN201911416437.2A CN201911416437A CN111188273A CN 111188273 A CN111188273 A CN 111188273A CN 201911416437 A CN201911416437 A CN 201911416437A CN 111188273 A CN111188273 A CN 111188273A
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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
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
- E01D21/06—Methods or apparatus specially adapted for erecting or assembling bridges by translational 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
- E01D6/00—Truss-type 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
- E01D2101/00—Material constitution of bridges
- E01D2101/30—Metal
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Abstract
The invention relates to a large-section steel truss girder erection system of a long-span steel-concrete composite bridge, which comprises a near-tower-end girder erection system and a steel truss girder assembly system; the near-tower-end beam erection system comprises a main tower portal frame, an auxiliary hole traction system, a pulley block and a temporary sling, and the steel truss beam assembly system mainly comprises a cable-carried crane walking mechanism, an auxiliary hole traction system and a connecting panel; the main tower portal comprises an upright post and a portal main truss; the auxiliary hole traction system is arranged on the operation platform and is connected with and fixes two ends of the main cable; the cable crane walking mechanism is arranged on the main cable, and the top of the cable crane walking mechanism is suspended with the gantry main truss on the top of the main tower gantry through a steel wire rope. The invention has the beneficial effects that: the easily-detachable anti-collision frame is arranged on the outer side of the auxiliary hole traction system, so that the traction system can be protected from being collided during operation, and the anti-collision frame is simple in structure, low in manufacturing cost and convenient to assemble and disassemble.
Description
Technical Field
The invention relates to the field of bridges, in particular to a large-section steel truss girder erection system of a long-span steel-concrete composite bridge and a construction method.
Background
In the construction of a suspension bridge, a large amount of manpower and material resources are needed for the erection construction of the steel truss, and in order to ensure the erection efficiency of the steel truss, two aspects of hoisting and moving of the steel truss are generally considered; in the assembly operation of the steel trussed beams, the linear shape of the steel trussed beams after closure is generally considered on the premise of ensuring the moving and transporting efficiency of the steel trussed beams and controlling the assembly precision. The traditional steel truss girder construction generally utilizes a loading and pressing construction method to carry out linear control, but the linear control operation is complicated, and the precision difficulty is difficult to control.
Aiming at the common problems in the erection and assembly of the steel truss girder, the structure of the erection system is determined by considering how to design the equipment installation of the erection system, and meanwhile, the scheme of designing the assembly of the steel truss girder is considered, and the determined error control scheme of the assembly of the steel truss girder is the key of the steel truss girder installation technology. Therefore, it is necessary to provide a large-section steel truss girder erection system and a construction method for a long-span steel-concrete composite bridge, which ensure the hoisting and installation of the steel truss girder and improve the construction efficiency on the basis of ensuring the linear shape of the steel truss girder.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a large-section steel truss girder erection system and a construction method for a long-span steel-concrete composite bridge, which can simplify the processes of hoisting, erecting and assembling the steel truss girder, ensure the linear control of the connection of the steel truss girder and have good economic and technical benefits.
The large-section steel truss girder erection system of the long-span steel-concrete composite bridge comprises a near-tower-end girder erection system and a steel truss girder assembly system; the near-tower-end beam erection system comprises a main tower portal frame, an auxiliary hole traction system, a pulley block and a temporary sling, and the steel truss beam assembly system mainly comprises a cable-carried crane walking mechanism, an auxiliary hole traction system and a connecting panel;
the main tower portal frame comprises an upright post and a portal frame main truss, a winch is arranged on the main tower portal frame, cantilever beams are welded at two ends of the portal frame main truss, and lifting cross beams are arranged on the cantilever beams; the pulley block comprises a pulley and a steel strand, a fixed pulley is arranged at the upper part of the pulley block, a pulley at the lower part of the pulley block is arranged as a movable pulley, a fixed pulley hoisting point is arranged on the cantilever beam, one end of the steel strand is connected with the pulley block, and the other end of the steel strand is connected with a winch;
the auxiliary hole traction system is arranged on the operation platform and is connected with and fixes two ends of the main cable; a traction system anti-collision frame is arranged outside the auxiliary hole traction system; the bottom of the temporary sling is welded on the operation platform, and a steel strand of the temporary sling is connected with the tower connecting rod to temporarily fix the steel truss;
the cable crane walking mechanism is arranged on a main cable, the top of the cable crane walking mechanism is suspended with a gantry main truss at the top of a main tower gantry through a steel wire rope, the bottom of the cable crane walking mechanism is provided with a longitudinal carrying pole beam, and one side of the longitudinal carrying pole beam is provided with a chain block; the main cable is provided with a cable clamp and a sling, and a temporary cable clamp and a temporary lifting lug are arranged at the design position of the main cable; the temporary lifting lugs are arranged on the partition plate, and the bottom end of the partition plate is fixed on the steel truss through I-steel; the connection panel is used for connecting adjacent beam sections and arranged on the two steel trusses.
Preferably, the method comprises the following steps: the sling is correspondingly connected with a sling lifting lug on the steel truss, and the temporary cable clamp is connected with a preset temporary lifting lug on the steel truss.
Preferably, the method comprises the following steps: the temporary cable clamp is formed by fastening two detachable anchor ears with nuts through bolts, and a cable lifting way is arranged on the outer surface of the temporary cable clamp.
Preferably, the method comprises the following steps: the connection panel sets up on four faces of steel truss, is equipped with a plurality of bolt hole on the connection panel and assembles the connection through connecting bolt.
Preferably, the method comprises the following steps: the plane of the traction system anti-collision frame is U-shaped, the traction system anti-collision frame is provided with an anti-collision outer beam, the bottom of the traction system anti-collision frame is provided with an anti-collision frame connecting bottom plate, and the anti-collision frame connecting bottom plate is connected with the operation platform through a connecting bolt; rubber pads are arranged on the outer side and the top of the traction system anti-collision frame.
The construction method of the large-section steel truss girder erection system of the long-span steel-concrete composite bridge comprises the following steps:
1) installing a main tower portal:
a) installing a traveling mechanism: modifying a main tower portal frame, installing two cable crane travelling mechanisms on a main cable, fixing the travelling mechanisms on the main cable by using a supporting cable clamp, adjusting the position and the height, and fixing the travelling mechanisms on the main tower portal frame through a steel wire rope;
b) installing a main beam bearing beam: lifting the main beam bearing beam in place, connecting the main beam bearing beam with a traveling mechanism through a pin shaft, adjusting the position and the height of the main beam bearing beam, and fixing the main beam bearing beam on a main tower portal frame through a steel wire rope;
c) installing equipment: hoisting and installing equipment in sequence by using a tower crane, threading lifting and traction steel strands, debugging the equipment, and preparing for descending a travelling mechanism of the cable crane;
2) installing a cable crane: hoisting the cable crane according to the hoisting sequence of the walking mechanism → the truss side beam → the truss middle section and the side beam splicing → the hydraulic control hoisting system installation;
3) and (3) steel truss girder transportation: transporting the steel truss to a site-designated position of a bridge site;
4) adding a temporary hoisting point: when the cable crane is used for hoisting and the temporary cable clamp is used for hoisting, a temporary hoisting point is additionally arranged; welding temporary lifting lugs on the beam sections during hoisting of the steel truss, and additionally arranging temporary cable clamp hoisting temporary lifting points; all beam section steel truss girder cable-carried crane hoisting points adopt reinforced rib plates welded in the upper beam box chamber;
5) hoisting the beam section: adopting different hoisting modes for the steel truss according to the stage and position sequence of the steel truss, respectively carrying out direct hoisting on a beam ship, pulling the steel trestle in place for hoisting and vertically hoisting on the trestle by using a cable crane, and finally vertically hoisting the beam section to be flush with the elevation of the trestle bridge deck;
6) the beam section moves: marking the design position of a beam moving support on the trestle according to the structural form of a beam section, and placing the support at the design position; after the beam section is lowered to the support, a jack is adopted to pull reversely to serve as a traction system to move the beam;
7) erecting a beam section: pulling the beam section by using a winch on the tower top in combination with a pulley block, and then hoisting the beam section to a designed elevation;
8) connecting beam sections:
a) closing the beam sections: after the top surface of the closed beam section lifted by the cable crane is flush with the bottom surface of the adjacent beam section, starting lifting, adjusting the longitudinal position of the closed section by using the chain block in a matching way, then releasing the traction force of the auxiliary hole traction system to enable the pre-biased beam section to gradually approach the closed section, and adjusting the height difference of the two beam sections after returning to the original position to complete connection closure;
b) temporary connection: the temporary connection is carried out by adopting a nail and a bolt, a spanner is adopted for screwing, and a nut is installed but not screwed;
c) permanent connection: according to the monitoring instruction of a monitoring unit, high bolts are adopted for permanently connecting the beam sections and are initially screwed in place, then bolts and punching nails for temporary connection are removed, high-strength bolts are replaced and are initially screwed in place, and finally all the high-strength bolts are finally screwed in place to realize the permanent connection between the beam sections.
The invention has the beneficial effects that:
(1) the easily-detachable anti-collision frame is arranged on the outer side of the auxiliary hole traction system, so that the traction system can be protected from being collided during operation, and the anti-collision frame is simple in structure, low in manufacturing cost and convenient to assemble and disassemble.
(2) The temporary hoisting points are designed for the steel truss girder with only single row of hoisting points, and the temporary cable clamp is adopted for auxiliary hoisting at the position corresponding to the main cable.
(3) The steel truss girder is connected by the connecting panels in the assembling stage of the steel truss girder, the bolts on the panels are used for adjustment, the temporary connection is hinged, the permanent connection of the steel truss girder is completed by using a hinge-solid conversion technology after the adjustment, the installation line shape of the steel truss girder can be ensured, and the traditional loading and pressing process is omitted.
Drawings
FIG. 1 is a schematic view of a near tower end beam mounting system of the present invention;
FIG. 2 is a schematic diagram of the assembly of the near-tower-end beam erecting system of the present invention;
FIG. 3 is a side view of the proximal tower beam mounting system of the present invention;
FIG. 4 is a schematic illustration of a beam section overpass of the present invention;
FIG. 5 is an assembled front view of the steel truss of the present invention;
FIG. 6 is a schematic view of a steel truss girder assembly system of the present invention;
FIG. 7 is a schematic view of an easily disassembled anti-collision frame of the auxiliary hole traction system of the present invention;
FIG. 8 is a top view of the removable impact rack of the secondary hole traction system of the present invention;
FIG. 9 is a schematic view of a temporary cord clamp in accordance with the present invention;
FIG. 10 is a schematic view of a temporary sling according to the present invention;
FIG. 11 is a flow chart of the construction process of the large-section steel truss girder erection of the large-span steel-concrete composite bridge.
Description of reference numerals: 1-main tower portal; 2-temporary sling rope connecting rope; 3-gantry main truss; 4-secondary hole traction system; 5-a main cable; 6-cantilever beam; 7-hoisting cross beams; 8-a pulley block; 9-a pulley; 10-fixed pulley hoisting points; 11-a winch; 12-steel strand wires; 13-a work platform; 14-cable crane main truss; 15-a cable crane running gear; 16-a temporary sling; 17-a tower linkage; 18-a steel truss; 19-a sling; 20-a cable clamp; 21-temporary cable clips; 22-longitudinal carrying pole beam; 23-chain block; 24-steel pipe piles; 25-a separator; 26-temporary lifting lugs; 27-i-section steel; 28-a connection panel; 29-connecting bolts; 30-a traction system collision avoidance frame; 31-anti-collision outer cross beam; 32-the anti-collision frame is connected with the bottom plate; 33-connecting bolts; 34-a rubber pad; 35-bolt holes; 36-a bolt; 37-a nut; 38-cableway; 39-steel wire rope; 40-a temporary sling mount; 41-temporary sling fillet welding; 42-temporary sling pulley.
Detailed Description
The present invention will be further described with reference to the following examples. The following examples are set forth merely to aid in the understanding of the invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
As shown in fig. 1 and 3, the working platform 13 is provided with an auxiliary hole traction system 4 as a fixed control frame of the main cable 5, and an auxiliary hole of the auxiliary hole traction system is used as a traction frame for the translation of the steel truss 18, and is used for releasing traction force when the steel truss 18 is connected and assisting the steel trusses 18 to approach each other; and a pulley block 8 is arranged on the side close to the main tower to serve as a hoisting system of a steel truss 18, a winch 11 arranged on the main tower portal frame 1 is used as a power system, a fixed pulley hoisting point 10 of the pulley block 8 is arranged at a hoisting cross beam 7, and the hoisting cross beam 7 is arranged at the cantilever end of the cantilever beam 6. As shown in fig. 3, after the steel truss 18 is lifted by the traveling mechanism 15 of the cable crane, it is temporarily fixed by being suspended by the temporary slings 16 and the tower links 17.
As shown in fig. 2, the whole splicing system mainly includes the cable crane traveling mechanism 15, a wire rope 39 for suspending the cable crane traveling mechanism 15, and a gantry main truss 3, and the gantry main truss 3 is erected on the main tower gantry 1. The cable crane running mechanism 15 takes the main cable 5 as a running base, and the main cable 5 is fixed and erected through a main hole of the auxiliary hole traction system 4.
As shown in fig. 4 and 5, the longitudinal spreader beam 22 is responsible for lifting the steel truss 18, and the cable clamp 20 mounted on the main cable 5 is connected to the sling lifting lug on the steel truss 18 by the sling 19. A temporary cable clamp 21 is arranged at the design position of the main cable 5 and is connected with a temporary lifting lug 26 through a lifting cable 19. And chain blocks 23 are adopted between the adjacent steel trusses 18 for positioning.
As shown in fig. 6, four connecting panels 28 are used to connect adjacent steel trusses 18 through connecting bolts 29, and a partition 25 is provided between the upper and lower beams of the steel truss and fixed by using i-steel 27, and a temporary lifting lug 26 is provided on the partition 25.
As shown in fig. 7 and 8, the traction system anti-collision frame 30 is U-shaped, and is used for protecting and wrapping a beam section near the auxiliary hole traction system 4, the anti-collision frame is provided with an anti-collision frame outer beam 31, rubber pads 34 are arranged on the outer side and the top of the anti-collision frame, an anti-collision frame connecting bottom plate 32 is arranged at the bottom of the anti-collision frame, bolt holes 35 are arranged on the bottom plate, and the anti-collision frame and the operation platform 13 are assembled and disassembled through connecting bolts 36.
As shown in fig. 9, the temporary cable clamp 21 is formed by two detachable hoops fastened with nuts 37 through bolts 36, and the outer surface of the temporary cable clamp 21 is provided with a cable way 38 for hanging a temporary sling.
As shown in fig. 10, the temporary sling 16 system is disposed on the steel truss 18, and mainly includes a temporary sling base 40, a temporary sling pulley 42, a temporary sling connecting rope 2 and a steel strand 12, wherein the steel strand 12 is connected with the tower link 17 to temporarily fix the steel truss 18.
As shown in fig. 11, the construction method of the large-section steel truss girder erection system of the long-span steel-concrete composite bridge comprises the following steps:
1) installing a main tower portal:
a) installing a traveling mechanism: the main tower portal frame 1 is modified according to the design, two cable crane travelling mechanisms 15 are installed on a main cable, the travelling mechanisms are fixed on the main cable 5 by using supporting cable clamps, and the position and the height of the travelling mechanisms are adjusted and fixed on the main tower portal frame 1 through a steel wire rope 39 so as to facilitate the erection of a main beam.
b) Installing a main beam bearing beam: after the main beam bearing beam is lifted in place, the main beam bearing beam is connected with the traveling mechanism through a pin shaft, the position and the height of the main beam bearing beam are adjusted, and the main beam bearing beam is fixed on the main tower portal frame 1 through a steel wire rope.
c) Installing equipment: and hoisting and installing the equipment by using a tower crane in sequence, threading the hoisting and traction steel strand 12, debugging the equipment and preparing for the running mechanism 15 of the cable crane.
2) Installing a cable crane: and hoisting the cable crane according to the hoisting sequence of the walking mechanism → the truss side beam → the truss middle section and the side beam splicing → the hydraulic control hoisting system.
3) And (3) steel truss girder transportation: and (4) transporting the steel truss 18 to the site designated position of the bridge site according to the design requirements.
4) Adding a temporary hoisting point: when the cable crane is used for hoisting and the temporary cable clamp 21 is used for hoisting, a temporary hoisting point needs to be additionally arranged. Temporary lifting lugs need to be welded on the beam sections during hoisting of the steel truss 18, and temporary hoisting points are additionally arranged on the temporary cable clamps 21. And all beam section steel truss girder cable-carried crane hoisting points are welded with reinforcing rib plates in the upper beam box chamber.
5) Hoisting the beam section: different hoisting modes are adopted for the steel truss 18 according to the stage and position sequence of the steel truss 18, the cable crane is respectively used for directly hoisting on a beam ship, pulling on a trestle in place for hoisting, vertically hoisting on the trestle and the like, and finally, the beam section is vertically hoisted to be flush with the elevation of the trestle bridge floor.
6) The beam section moves: marking the design position of the beam moving support on the trestle according to the structural form of the beam section, and placing the support at the design position. And after the beam section is lowered onto the support, a jack is adopted to reversely pull the beam section as a traction system to move the beam.
7) Erecting a beam section: and dragging the beam section by using a winch 11 on the top of the tower in cooperation with the pulley block 8, and then hoisting the beam section to a designed elevation.
8) Connecting beam sections:
a) closing the beam sections: after the top surface of the closed beam section lifted by the cable crane is flush with the bottom surface of the adjacent beam section, the cable crane starts to lift slowly, meanwhile, the longitudinal position of the closed beam section is adjusted by the cooperation of the chain block 23 to prevent the beam section from being collided and damaged at the port of the beam section, the traction force of the auxiliary hole traction system 4 is slowly released, the pre-biased beam section is gradually close to the closed beam section, and the height difference of the two beam sections is adjusted after returning to the original position to complete connection and closure.
b) Temporary connection: the temporary connection adopts a nail and a bolt, and the common wrench is adopted for screwing, so that the nut is only required to be brought on and is not screwed down, thereby avoiding influencing the connecting plate.
c) Permanent connection: according to the monitoring instruction of a monitoring unit, high bolts are adopted for permanently connecting the beam sections, the beam sections are initially screwed in place in time, then bolts and punching nails for temporary connection are removed, high-strength bolts are replaced and initially screwed in place, and finally all the high-strength bolts are finally screwed in place to realize the permanent connection between the beam sections.
Claims (6)
1. The large-section steel truss girder erection system of the large-span steel-concrete composite bridge is characterized by comprising a near-tower-end girder erection system and a steel truss girder assembly system; the near-tower-end beam erection system comprises a main tower portal frame (1), an auxiliary hole traction system (4), a pulley block (8) and a temporary sling (16), and the steel truss beam assembly system mainly comprises a cable-carried crane walking mechanism (15), the auxiliary hole traction system (4) and a connecting panel (28);
the main tower portal frame (1) comprises upright columns and a portal frame main truss (3), a winch (11) is arranged on the main tower portal frame (1), cantilever beams (6) are welded at two ends of the portal frame main truss (3), and lifting cross beams (7) are arranged on the cantilever beams (6); the pulley block (8) comprises a pulley (9) and a steel strand (12), a fixed pulley is arranged at the upper part of the pulley block (8), the pulley (9) at the lower part of the pulley block (8) is set as a movable pulley, a fixed pulley hoisting point (10) is arranged on the cantilever beam (6), one end of the steel strand (12) is connected with the pulley block (8), and the other end of the steel strand (12) is connected with a winch (11);
the auxiliary hole traction system (4) is arranged on the operation platform (13), and the auxiliary hole traction system (4) is connected with and fixes two ends of the main cable (5); a traction system anti-collision frame (30) is arranged on the outer side of the auxiliary hole traction system (4); the bottom of the temporary sling (16) is welded on the operation platform (13), and a steel strand (12) of the temporary sling (16) is connected with a tower connecting rod (17) to temporarily fix a steel truss (18);
the cable crane walking mechanism (15) is installed on a main cable (5), the top of the cable crane walking mechanism (15) is suspended with a portal main truss (3) at the top of a main tower portal (1) through a steel wire rope (39), a longitudinal carrying pole beam (22) is arranged at the bottom of the cable crane walking mechanism (15), and a chain block (23) is installed on one side of the longitudinal carrying pole beam (22); a cable clamp (20) and a sling (19) are arranged on the main cable (5), and a temporary cable clamp (21) and a temporary lifting lug (26) are arranged at the design position of the main cable (5); the temporary lifting lugs (26) are arranged on the partition plates (25), and the bottom ends of the partition plates (25) are fixed on the steel truss through I-shaped steel (27); the connecting panel (28) is used for connecting adjacent beam sections, and the connecting panel (28) is arranged on the two steel trusses (18).
2. The system for erecting the large-section steel truss girder of the large-span steel-concrete composite bridge according to the claim 1, wherein the suspension cables (19) are correspondingly connected with suspension cable lifting lugs on the steel truss (18), and the temporary cable clamps (21) are connected with temporary lifting lugs (26) preset on the steel truss (18).
3. The system for erecting the large-section steel truss girder of the large-span steel-concrete composite bridge according to claim 1, wherein the temporary cable clamp (21) is formed by fastening two detachable hoops with nuts (37) through bolts (36), and the outer surface of the temporary cable clamp (21) is provided with a cable hanging channel (38).
4. The large-span steel-concrete composite bridge large-section steel truss girder erection system according to claim 1, wherein the connection panels (28) are arranged on four faces of the steel truss (18), and the connection panels (28) are provided with a plurality of bolt holes and are connected in a splicing manner through the connection bolts (29).
5. The large-span steel-concrete composite bridge large-section steel truss girder erection system according to claim 1, wherein the plane of the traction system anti-collision frame (30) is U-shaped, the traction system anti-collision frame (30) is provided with an anti-collision outer cross beam (31), the bottom of the traction system anti-collision frame (30) is provided with an anti-collision frame connecting bottom plate (32), and the anti-collision frame connecting bottom plate (32) is connected with the operation platform (13) through a connecting bolt (33); rubber pads (34) are arranged on the outer side and the top of the traction system anti-collision frame (30).
6. A construction method of a large-section steel truss girder erection system of a long-span steel-concrete composite bridge as claimed in claim 1, which comprises the following steps:
1) installing a main tower portal:
a) installing a traveling mechanism: refitting a main tower portal frame (1), installing two cable crane travelling mechanisms (15) on a main cable, fixing the travelling mechanisms on the main cable (5) by utilizing a supporting cable clamp, adjusting the position and the height, and fixing the travelling mechanisms on the main tower portal frame (1) through a steel wire rope (39);
b) installing a main beam bearing beam: lifting the main beam bearing beam in place, connecting the main beam bearing beam with a traveling mechanism through a pin shaft, adjusting the position and the height of the main beam bearing beam, and fixing the main beam bearing beam on a main tower portal frame (1) through a steel wire rope;
c) installing equipment: hoisting and installing equipment in sequence by using a tower crane, threading a lifting and traction steel strand (12), debugging the equipment, and preparing for descending a travelling mechanism (15) of the cable crane;
2) installing a cable crane: hoisting the cable crane according to the hoisting sequence of the walking mechanism → the truss side beam → the truss middle section and the side beam splicing → the hydraulic control hoisting system installation;
3) and (3) steel truss girder transportation: transporting the steel truss (18) to a site-designated position of a bridge site;
4) adding a temporary hoisting point: when the cable crane is used for hoisting and the temporary cable clamp (21) is used for hoisting, a temporary hoisting point is additionally arranged; when the steel truss (18) is hoisted, temporary lifting lugs are welded on the beam sections, and temporary hoisting points of temporary cable clamps (21) are additionally arranged; all beam section steel truss girder cable-carried crane hoisting points adopt reinforced rib plates welded in the upper beam box chamber;
5) hoisting the beam section: different hoisting modes are adopted for the steel truss (18) according to the stage and position sequence of the steel truss (18), a cable crane is respectively used for directly hoisting on a beam ship, pulling the steel trestle in place and hoisting on the trestle vertically, and finally the beam section is vertically hoisted to be flush with the bridge deck elevation of the trestle;
6) the beam section moves: marking the design position of a beam moving support on the trestle according to the structural form of a beam section, and placing the support at the design position; after the beam section is lowered to the support, a jack is adopted to pull reversely to serve as a traction system to move the beam;
7) erecting a beam section: a winch (11) on the top of the tower is matched with a pulley block (8) to drag the beam section, and then the beam section is hung to a designed elevation;
8) connecting beam sections:
a) closing the beam sections: after the top surface of the closure beam section lifted by the cable crane is flush with the bottom surface of the adjacent beam section, the cable crane starts to lift, meanwhile, the longitudinal position of the closure section is adjusted by the cooperation of a chain block (23), then the traction force of an auxiliary hole traction system (4) is released, so that the pre-biased beam section is gradually close to the closure section, and the height difference of the two beam sections is adjusted after returning to the original position to complete connection closure;
b) temporary connection: the temporary connection is carried out by adopting a nail and a bolt, a spanner is adopted for screwing, and a nut is installed but not screwed;
c) permanent connection: according to the monitoring instruction of a monitoring unit, high bolts are adopted for permanently connecting the beam sections and are initially screwed in place, then bolts and punching nails for temporary connection are removed, high-strength bolts are replaced and are initially screwed in place, and finally all the high-strength bolts are finally screwed in place to realize the permanent connection between the beam sections.
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| CN201911416437.2A CN111188273A (en) | 2019-12-31 | 2019-12-31 | Large-section steel truss girder erection system of large-span steel-concrete composite bridge and construction method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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Application publication date: 20200522 |