ASSEMBLY BUILDING, dismantling formwork (COFFA), scaffolding (scaffolding) SAFELY, QUICKLY
- Measures required for the erection, dismantling formwork
- Solution formwork, scaffolding formwork for the project, shaped steel scaffolding. Also associated with tree protection and timber formwork to erect structures for small, odd.
1. Technical Requirements of formwork:
- Formwork and scaffolding was designed and constructed to ensure stiffness, stability, ease of assembly, not difficult to put reinforcing steel, placing and compacting concrete.
- Formwork must be seaming, snugly so as not to dehydrate cement when placing and compacting concrete, while protecting new concrete is poured under the action of the weather.
- Formwork beams, flooring transplant before installing rebar, formwork columns transplant after installing rebar.
2. Installation column formwork foundation.
- Formwork stations and beam foundation piles are installed after the erection of reinforced
- Stress cardiac axis wire column according to the standard 2 method.
- Assembling the formwork in accordance with the size of each concrete foundation.
- Determine the midpoint of each edge formwork, through the brace position and close the timber perpendicular to reinforcement.
- Fixed shuttering sheet piles by struts.
Column formwork.
- First, to proceed down the pole 50mm stem to support formwork construction. Note the set of steel on the floor to make room waiting for formwork anchor column.
- Processing plaques the size of the size of one side column.
- Merge array size of each column.
- Use a shackle (steel or wood fixed), the distance of the chains and about 50 cm.
Note: The right to windows to concrete, columns pins holes to the bathroom before lunch when pouring concrete.
* How to assemble:
Column cross streak feet to the floor, floor.
- Fixed mounting clips with padded wooden plinth built in the heart of the foundation blocks to gauge
- Construct turn the inside wall and then to the outside and nailed array associated with each 4 array, mounting a shackle and packed.
- Use a level to check plumb vertical column.
- Fixed column formwork with anchorages or resistant plants.
Beam formwork.
Consists of 2 and 1 shuttering formwork into the bottom. Erection of the following ways:
- Identify heart beams.
- Laying Bedstead to set foot column.
- Put the tree against the T, put 2 plants against damage column, 2 columns fixed, added some columns along the center of the beam.
- Laying plank floor beams supporting beam pillars T, fixed 2 head with braces.
- Put the beam formwork panels, nailing associated with beam bottom, fixed on the edge of the shackle, anti-slanting tree, bolts.
- Check heart beams, floor beams height adjustment for proper design.
Farmwork floor.
- Use a steel formwork scaffolding system on the A-bearing steel and wooden purlins system, use the maximum area of shaped steel formwork, with the remaining area is used in combination timber formwork.
- According perimeter edging plank floor boards fringing associated leech nails into formwork formwork beams and girders supporting beams.
Note: After the work is finished formwork must be checked and accepted formwork according to the following:
- Check the shape size according to Table 2-TCVN 4453: 1995
- Check the rigidity of the support systems, combat systems.
- The right hand panel of formwork (surface in contact with the concrete surface).
- Check the gaps between the tiles together.
- Check the details buried underground.
- Check the heart remains, size structure.
- Distance formwork with reinforcement.
- Check the coating, sanitary inspection formwork.
Dismantle Formwork:
Formwork scaffolding was dismantled only when concrete gain the necessary strength to withstand structural self-weight load and other impacts of the construction phase in the following. When dismantling formwork, scaffolding avoid sudden stress or bumps to concrete structures.
Parts formwork, scaffolding no bearing after concrete has hardened (formwork of beams, walls, columns) can be dismantled when the concrete reaches strength of 50% daN / cm2.
Structural cell couch, the coil, will hatch only remove shoring and formwork bottom of the concrete strength design full marks.
When dismantling scaffolding formwork in the concrete slab of monolithic multi-storey building should be done as follows:
- Keep The entire scaffolding and shoring in the slab adjacent coming under concrete slab
- Thao Unloading parts pillars of slab formwork under the pillar again and keep “safe” beams spaced 3 m below the larger span of 4m.
For formwork scaffolding for structural strength (bottom beams, floors, columns) if no special instructions are designed to be dismantled when the concrete reaches strength of 50% (7 days) with the beams, arches with smaller aperture 2m intensity reached 70% (10 days) with a beam, arch width of 2-8m, reached 90% with the intensity of the beam, arch 8m larger aperture.
HHH VIET NAM TRADING SERVICE COMPANY LIMITED
Address: Hop Thanh commune, My Duc district, Hanoi city
Tel: 0989 104 218
Email: cungcapnhanluchhh@gmail.com
