Longspan steel truss girder multi-point pushing system and pushing process thereof
Technical field
The present invention relates to longspan steel truss girder multi-point pushing system and pushing process, more specifically is pushing tow system and the pushing process that adopts when the incremental launching construction for longspan steel truss girder.
Background technology
In the steel bridge construction, longspan steel truss girder often adopts the construction of multiple spot successively incremeantal launching method, finally finishes the installation of steel truss girder by the dilatory steel truss girder of jack.
Present steel truss girder top-pushing mechanism all is that the quantity according to main truss in the steel truss girder design section is set to two above pushing slides and without pushing tow stopping means and vertical elevation adjusting device.But, in some steel truss girder incremental launching constructions, steel truss girder design span is larger, if the pushing tow system arranges single-point thrustor and infinite place device and vertical elevation adjusting device, so both affected the stressed of steel truss girder, and reduced efficiency of construction and also can't satisfy the requirement that is designed to bridge simultaneously.
Such as, loop wire Economic Development Zone, south, Hefei and southern Fei river in Anhui Province Flexible arch bridge with steel truss beam, its main bridge steel truss girder is two main trusses, adopts incremental launching construction, if adopt the top-pushing mechanism of single-point pushing slide and infinite place device and vertical elevation adjusting device, then be difficult to guarantee the stressed good of steel truss girder.For this multi-point pushing system pushing tow, can adjust the steel truss girder absolute altitude and in the pushing tow process, steel truss girder be carried out spacing top-pushing mechanism, relevant open report also in the prior art.
Summary of the invention
The present invention is for avoiding the existing weak point of above-mentioned prior art, a kind of longspan steel truss girder multi-point pushing mechanism and pushing process thereof are provided, make the steel truss girder with two and above main truss in incremental launching construction, steel truss girder is stressed clear and definite, guarantees steel truss girder pushing tow quality.
Technical solution problem of the present invention adopts following technical scheme:
A kind of longspan steel truss girder multi-point pushing system, the multi-point pushing system is comprised of with the auxiliary traction mechanism that is positioned at steel truss girder lower chord bottom the main pushing tow of the six covers systems that lay respectively at two Pin steel truss girders bottom, main pushing tow system has two vertical main skids, described vertical main skid is bearing on the falsework slipway beam, jack is fixedly installed on the falsework slipway beam, main drag cable one end is connected in described jack, and the other end is connected in the lower chord bottom of each sections steel truss girder by the counter-force seat; At the top of described falsework slipway beam the top is set and lifts jack and MGB plate slide block, be used for regulating the bearing height of falsework slipway beam; Described auxiliary traction mechanism arranges the counter-force seat for two Pin steel truss girder lower chords respectively by both sides falsework platform, in the bottom of described steel truss girder lower chord the auxiliary traction rope is set; The spacing jack of horizontal correction is set in the steel truss girder both sides.
Be provided with corrosion resistant plate at described vertical main skid end face.
A kind of longspan steel truss girder multi-point pushing process, as follows operation:
Jack is lifted on step a, jacking top, and places MGB plate slide block at the end face of corrosion resistant plate, makes steel truss girder be adjusted at the absolute altitude of design;
Step b, connect jack and counter-force seat by main drag cable, start jack and begin pushing tow; In the process of pushing tow, with the position of the spacing jack maintenance of the horizontal correction in both sides steel truss girder, and correct the sideslip of steel truss girder in the pushing tow process;
When the traction of step c, the counter-force seat on this sections steel truss girder puts in place, remove the counter-force seat and be installed on the base plate of steel truss girder lower chord of next sections repeating step a and step b.
Compared with the prior art, beneficial effect of the present invention is embodied in:
1, the Steel truss structure that the present invention is directed to two and above main truss arranges the vertical main skid of twice, makes steel truss girder stressed clear and definite, simple to operate in the pushing tow process.
2, the MGB plate slide block among the present invention can accurately be adjusted steel case beam in design elevation, guarantees linear the meeting design requirement of one-tenth bridge of full-bridge.
Plan-position when 3, the present invention arranges the spacing jack of horizontal correction and auxiliary traction rope and can be good at controlling the steel truss girder pushing tow guarantees that quality of finished bridge satisfies code requirement.
4, several functions of the present invention is comprehensive, has saved to greatest extent cost, has simplified construction.
Description of drawings
Fig. 1 is the laterally spacing jack layout of correction schematic diagram of the present invention;
Fig. 2 is that the vertical hydraulic jack of the present invention is arranged schematic diagram;
Fig. 3 is that level jin of the present invention top counter-force seat is arranged schematic diagram.
The specific embodiment
Referring to accompanying drawing, a kind of longspan steel truss girder multi-point pushing system, the multi-point pushing system is comprised of with the auxiliary traction mechanism that is positioned at steel truss girder lower chord bottom the main pushing tow of the six covers systems that lay respectively at two Pin steel truss girders bottom, main pushing tow system has two vertical main skids, described vertical main skid is bearing on the falsework slipway beam, jack 2 is fixedly installed on the falsework slipway beam, main drag cable one end is connected in jack, and the other end is connected in the lower chord bottom of each sections steel truss girder by counter-force seat 3; At the top of described falsework slipway beam the top is set and lifts jack and MGB plate slide block, be used for regulating the bearing height of falsework slipway beam; Described auxiliary traction mechanism arranges the counter-force seat for two Pin steel truss girder lower chords respectively by both sides falsework platform, in the bottom of described steel truss girder lower chord the auxiliary traction rope is set; The spacing jack 1 of horizontal correction is set in the steel truss girder both sides, is provided with corrosion resistant plate at vertical main skid end face.
A kind of longspan steel truss girder multi-point pushing process, as follows operation:
Jack is lifted on step a, jacking top, and places MGB plate slide block at the end face of corrosion resistant plate, makes steel truss girder be adjusted at the absolute altitude of design;
Step b, connect jack and counter-force seat by main drag cable, start jack and begin pushing tow; In the process of pushing tow, with the position of the spacing jack maintenance of the horizontal correction in both sides steel truss girder, and correct the sideslip of steel truss girder in the pushing tow process;
When the traction of step c, the counter-force seat on this sections steel truss girder puts in place, remove the counter-force seat and be installed on the base plate of steel truss girder lower chord of next sections repeating step a and step b.