Summary of the invention
Technical problem to be solved by this invention provides a kind of short construction period, low, the safe construction method of large-diameter coal bunker flat-topping lid of construction cost.
The technical scheme that the present invention solves its technical problem is:
A kind of construction method of large-diameter coal bunker flat-topping lid, its processing step is: 1. determining of H shaped steel and sliding formwork position of platform, and 2. coal bunker inner barn wall pre-embedded steel slab, 3. steel lattice column is pre-buried on the coal bunker bulkhead collar tie beam, 4. the sliding formwork platform descends, 5. the sliding formwork platform is fixed, and 6. welds the fixedly steel corbel of H shaped steel, and 7. H shaped steel is in place, 8. H section steel reinforcement, 9. girder template in top, storehouse is installed, 10. the girder reinforcing bar binding
Main beam concrete is built,
Secondary beam and top board construction,
Template and support system are removed.
The technical scheme that the present invention solves its technical problem can also be:
Definite step of H shaped steel of the present invention and sliding formwork position of platform is specifically to determine the position of H shaped steel and sliding formwork platform at the design attitude of coal bunker according to coal bunker flat-topping lid main girder (8), described coal bunker inner barn wall pre-embedded steel slab step is for when the coal bunker bulkhead is poured into the precalculated position of H shaped steel and sliding formwork platform, the steel plate of the steel plate of pre-buried fixedly H shaped steel and sliding formwork platform on the inner barn wall of coal bunker bulkhead, the pre-buried step of described steel lattice column is for when building the apical ring beam of coal bunker bulkhead, the pre-buried steel lattice column that exceeds the ring beam top on the coal bunker bulkhead apical ring beam of the both sides of storehouse lid main girder, described sliding formwork platform decline step is for after the coal bunker bulkhead apical ring beam of building solidifies, it is the sliding formwork position of platform that the sliding formwork platform is dropped to the following precalculated position of lid main girder lower plane, storehouse, described sliding formwork platform fixing step is for after the sliding formwork platform drops to the precalculated position, fix the sliding formwork platform by welding sliding formwork platform steel corbel on steel plate pre-buried on the inner barn wall of coal bunker bulkhead, the described welding fixedly steel corbel step of H shaped steel is to weld the fixedly steel corbel of H shaped steel on the pre-buried steel plate of the inner barn wall of coal bunker bulkhead, described H shaped steel step in place is for after steel corbel welds, lift H shaped steel on the steel corbel and weld fixation steel plate and fix, described H section steel reinforcement step is for welding suspension centre on H shaped steel, utilize wire rope by wire clips fixing oblique rope between suspension centre and steel lattice column, top, described storehouse girder template installation steps are for passing through in the vertical rod of H shaped steel upper support, bridging is set between vertical rod fixes the girder soffit formwork, described girder reinforcing bar binding step is to design according to main beam structure, according to the technical requirements of " concrete structure engineering construction quality standards of acceptance " GB50204-2002 to reinforcing bar binding, carry out the layout and the colligation of girder reinforcing bar, described main beam concrete is built step for to support at the girder soffit formwork, the technical requirements of according to " concrete structure engineering construction quality standards of acceptance " GB50204-2002 main beam concrete being built after fixedly finishing, layering, building of main beam concrete carried out in gradation, described secondary beam and top board construction step are installed and reinforcing bar binding for the template of building finish laggard places beam and top board at main beam concrete, carry out the concreting of secondary beam and top board again, described template and support system are removed step for treating girder, be girder after the secondary beam concrete solidifies fully, the secondary beam concrete strength reaches 100% o'clock of design strength, wire rope is unclamped and extract, remove the girder template, secondary beam and roof plate template, H shaped steel, and the steel lattice column exposed parts cut off.
The present invention is in main beam concrete pouring construction process, concreting is carried out in layering, gradation, forbid to touch template and reinforcing bar when vibrating, and build preceding, build neutralization and respectively the stress deformation of H shaped steel monitored after building, at girder four observation points are set vertically, measure once before building, measure once again after building half, measure once again after having built, and stay surveying record.
The present invention is the elongated twice H shaped steel that is provided with under the per pass girder supports, H shaped steel is apart from sliding formwork platform 300mm height, be connected firmly with channel-section steel every 2 meters between the H shaped steel and between H shaped steel and the bulkhead, channel-section steel and the welding of H shaped steel are fixing, and described suspension centre is arranged on the position of H shaped steel and determines according to calculating.
The support of secondary beam of the present invention and top board utilizes diagonal brace, and the template springing height is by designing requirement, and secondary beam and concrete roof are built together.
The invention has the beneficial effects as follows:
Utilize the principle of cable stayed bridge, the H shaped steel of the wide bed at the bottom of the beam is carried out multiple tracks tiltedly draw, make its requirement of satisfying concrete main girder working load, its structural system is simple, and is stressed clear and definite, is convenient to the foundation and the calculating of computation model.
The sliding formwork platform is reduced to desired location, only uses as material loading and operating platform, and it is stressed little, safe and reliable.
Need not to set up in the storehouse full hall scaffold, improved work efficiency, shortened the construction period, reduced construction cost.
Compare with conventional construction method, high-rise working is safe and reliable, has guaranteed construction quality, and speed of application is significantly accelerated, and reduces the use of circulation material in a large number, has reduced labor strength, remarkable in economical benefits.
The specific embodiment
A kind of construction method of large-diameter coal bunker flat-topping lid, its processing step is: 1. determining of H shaped steel and sliding formwork position of platform, and 2. coal bunker inner barn wall pre-embedded steel slab, 3. steel lattice column is pre-buried on the coal bunker bulkhead ring beam, 4. the sliding formwork platform descends, 5. the sliding formwork platform is fixed, and 6. welds the fixedly steel corbel of H shaped steel, and 7. H shaped steel is in place, 8. H section steel reinforcement, 9. girder template in top, storehouse is installed, 10. the girder reinforcing bar binding
Main beam concrete is built,
Secondary beam and top board construction,
Template and support system are removed.Definite step of described H shaped steel and sliding formwork position of platform is specifically to determine the position of H shaped steel and sliding formwork platform at the design attitude of coal bunker according to coal bunker flat-topping lid
main girder 8, described coal bunker inner barn wall pre-embedded steel slab step is for when coal bunker bulkhead 5 is poured into the precalculated position of H shaped steel 4 and sliding formwork platform 2, the steel plate of the
steel plate 3 of pre-buried fixedly H shaped steel 4 and sliding formwork platform 2 on the inner barn wall of coal bunker bulkhead 5, the pre-buried step of described steel lattice column is for when building the apical ring beam of coal bunker bulkhead 5, the pre-buried steel lattice column 6 that exceeds the ring beam top on the coal bunker bulkhead apical ring beam of the both sides of storehouse lid
main girder 8, described sliding formwork platform decline step is for after the coal bunker bulkhead apical ring beam of building solidifies, it is the sliding formwork position of platform that sliding formwork platform 2 is dropped to the following precalculated position of lid
main girder 8 lower planes, storehouse, described sliding formwork platform fixing step is for after sliding formwork platform 2 drops to the precalculated position, fix sliding formwork platform 2 by welding sliding formwork platform steel corbel 1 on steel plate pre-buried on the inner barn wall of coal bunker bulkhead 5, the described welding fixedly steel corbel step of H shaped steel is to weld the fixedly steel corbel 9 of H shaped steel 4 on the
pre-buried steel plate 3 of the inner barn wall of coal bunker bulkhead 5, described H shaped steel step in place is after steel corbel 9 welding are good, lift H shaped steel 4 on the steel corbel 9 and weld fixation steel plate and fix, described H section steel reinforcement supports step for weld suspension centre on H shaped steel, utilize wire rope by wire clips fixing oblique rope 7 between suspension centre and steel lattice column 6, top, described storehouse girder template installation steps are for passing through in the vertical rod of H shaped steel upper support, bridging is set between vertical rod fixes the girder soffit formwork, described girder reinforcing bar binding step is to design according to main beam structure, according to the technical requirements of " concrete structure engineering construction quality standards of acceptance " GB50204-2002 to reinforcing bar binding, carry out the layout and the colligation of girder reinforcing bar, described main beam concrete is built step for to support at the girder soffit formwork, the technical requirements of according to " concrete structure engineering construction quality standards of acceptance " GB50204-2002 main beam concrete being built after fixedly finishing, layering, building of main beam concrete carried out in gradation, described secondary beam and top board construction step utilize support and diagonal brace fixedly to build the template of secondary beam and top board on H shaped steel and sliding formwork platform 2 for build the back that finishes at main beam concrete, the template fixation, after the assembling reinforcement, carrying out secondary beam and top board again must build, described template and support system are removed step for treating girder, be girder after the secondary beam concrete solidifies fully, the secondary beam concrete strength reaches 100% o'clock of design strength, wire rope is unclamped and extract, remove the girder template, secondary beam and roof plate template, H shaped steel, and the steel lattice column exposed parts cut off.In main beam concrete pouring construction process, concreting is carried out in layering, gradation, forbid to touch template and reinforcing bar when vibrating, and build preceding, build neutralization and respectively the stress deformation of H shaped steel monitored after building, at girder four observation points are set vertically, measure once before building, measure once again after building half, measure once again after having built, and stay surveying record.The elongated twice H shaped steel that is provided with under the per pass girder supports, H shaped steel is apart from sliding formwork platform 300mm height, be connected firmly with channel-section steel every 2 meters between the H shaped steel and between H shaped steel and the bulkhead, channel-section steel and the welding of H shaped steel are fixing, and described suspension centre is arranged on the position of H shaped steel and determines according to calculating.The support of secondary beam and top board utilizes diagonal brace, and the template springing height is by designing requirement, and secondary beam and concrete roof are built together.