Biện pháp thi công cán nền

FLOOR LEVELING PROCESS with S485 LASER SCREED Quang Ngai, Vietnam October 22 to 29, 2019 www.anconbeton.com FLOOR LEVELING PROCESS Roof and side protection is installed Formwork set up Set-up of laser transmitter, set up grade rod, set up s485 Set-up of pump lines (if there are rebars) Vibration of concrete Rough Level by manual labor Quick Pass Function s485 Levelling • Fine Level by s485 • Check fine level screed with grade rod • Edging • Mesh Roller • Channel Float • Check Rod ROOF AND SIDE PROTECTION ARE INSTALLED • • Photo 1: Roof and side protection installed for protection from direct sunlight, rain, and wind getting into the concrete floor during casting This will prevent rapid evaporation of water from the concrete surface Photo 2: If walls are not in place, erect scaffolding cover (blue sheet) locked down and at least meters high to prevent rain water and wind blowing in during finishing process Photo Photo FORMWORK SET UP • • Photo 1: Slab on grade Photo 2: slab on piles SET UP OF S485 1.) Obtain finish floor level by setting laser guided transmitter 2.) Transmitter will transfer the designed elevation 3.) Laser Receiver are set to the s485 for rough (quick pass) and screeding (smooth) SET UP OF LASER TRANSMITTER FOR S485 1.) Obtain finish floor level by setting laser guided transmitter 2.) Transmitter will transfer the designed elevation SET UP GRADE ROD Set Grade Rod to bench mark Read numbers on grade rod Set matching numbers on machine receive poles Screed test pass and adjust SET UP PUMP LINES WITH LINE PUMP • Sequencing of placing concrete is important to have good coordination during casting SET UP PUMP LINES WITH LINE PUMP (CONT’D) This concrete is discharged in meter strips wide WITH STEEL FIBER CONCRETE SLAB • Discharge concrete in strips around 4m width 10 VIBRATION Vibrator must be inserted immediately after placing Vibrator must be inserted vertically to reduce the air entrance 11 MANUAL ROUGH LEVELING JUST ABOVE GRADE 12 ROUGH LEVELING BY ‘QUICK PASS’ FUNCTION The s485 can pull the concrete to a rough level through a function called “Quick Pass” 13 FINE LEVEL TO DESIRED FFL 14 USE GRADE ROD TO CHECK LEVEL 15 FINE LEVEL OF SCREEDED CONCRETE After first pass of fine level, s485 will move parallel to the first pass area Need to overlap properly to have accurate elevation with smooth joint 16 HAND SCREED TOOLS FOR EDGING 17 HAND TOOLS-MESH ROLLER Mesh Roller is to embed steel fibers and to bring up some cement paste up to surface to cover Mesh Roller can also be used to push down coarse aggregates at the surface of concrete 18 HAND TOOLS-CHANNEL FLOAT After Mesh Roller has pass through, apply channel float to fill surface and improve flatness Overlap each pass by 50% 19 HAND TOOLS-CHECK ROD For higher tolerance floor apply check rod when concrete is still plastic Overlap each pass by 50% 20 RESULT OF A GOOD LEVEL FLOOR 21 Knowledge Sharing Education Providing Solutions Viet Nguyen: vanguyen@anconbeton.com ... protection from direct sunlight, rain, and wind getting into the concrete floor during casting This will prevent rapid evaporation of water from the concrete surface Photo 2: If walls are not... is important to have good coordination during casting SET UP PUMP LINES WITH LINE PUMP (CONT’D) This concrete is discharged in meter strips wide WITH STEEL FIBER CONCRETE SLAB • Discharge concrete