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
1.
2.
3.
4.
5.
6.
7.
8.

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

2


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 2 meters high to prevent rain water and wind blowing in during finishing
process

Photo 1

Photo 2

3


FORMWORK SET UP
•
•

Photo 1: Slab on grade

Photo 2: slab on piles

4


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)
5


SET UP OF LASER TRANSMITTER FOR S485

1.) Obtain finish floor level by setting laser guided transmitter
2.) Transmitter will transfer the designed elevation
6


SET UP GRADE ROD

1.
2.
3.
4.

Set Grade Rod to bench mark
Read numbers on grade rod
Set matching numbers on machine receive poles

Screed test pass and adjust

7


SET UP PUMP LINES WITH LINE PUMP
•

Sequencing of placing concrete is important to have good coordination during
casting

8


SET UP PUMP LINES WITH LINE PUMP (CONT’D)
This concrete is discharged in 4 meter strips wide

9


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
1.
2.

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


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