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Dear all,
As you have been helping everbody with construction & planning techniques please advise in a project if we have basement area - 3300 sqm. how should we plan for concrete pours.what should be basis for concrete pours??how this sequence should be preferred.also if i have plot graph for concrete each month then for each day how much concrete is pumped/poured.please give a detail understanding on this case.
Rgds,
Vrinda.
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hi Vrinda,
my suggestion would be as below:
your planning should be based on the production facilities available with you, number of transit mixers, method of placing the concrete, number of pour points, setting time of the mix, etc.
as you want to go for 3 pours in raft, roughly 1000 sqm to be covered in one pour. select the part on top priority, such that ur superstructure construction is not delayed.
if the pour size is 1000 cum, your production is 100 cum/hr, u must plan the concrete for 10 hrs. remember, the transportation, placement should also be matching the rate of production.
for the base raft, to begin with, you must decide the longest strip to concrete.
pls calculate the rate of pour to avoid cold joints. this will be derived from the revibrating time of the mix. based on this, you must break ur pour into number of bricks, and concrete should be continuous to avoid any cold joints.
for the slabs, similar method can be used, but the rate of pour is much less compared to rafts.
a simple program in excel can give u the monthly concrete u need.
good luck.
Pethanna.
Hi Vrinda
Sorry but we cannot write your programme for you.
You must discuss the pour sequence with the engineer in charge.
Best regards
Mike Testro
The building is 2B+G+M+5 floors.
Yes,it is raft foundation with lift pits & water tank .I have planned such that on this raft Area 1 - Lift pits ,Area 2 - Water tank area and Area 3 - other areas...
.So i would like to know that how concrete pour sequence will be -
For 1 Basement & Ground floor - which are RCC Slabs.....??? same as raft...????
For Superstructure 1st floor - 300mm thk Post Tensioned Slab having area of 2499 sq.m.
Please email me if u have any detailed program or some slides to indicate concrete pouring.
Rgds,
Vrinda.
For super flat floors use none of the above, pour a big segment with no strips, saw-cut slab the same day in both directions.
3300sm of basement seems more like having a mat foundation, not a slab on ground, and such size although can be poured on a single day probably will be done in a few pours.
If the mat is 1mt thick it means pouring 3300cm, a 10 hours pour will require a concrete rate of 330cm per hour or 33 concrete trucks per hour if 10cm per truck.
Sometimes the mat will support the bracing of the perimeter excavation, so you excavate and pour center section first, use it for bracing the perimeter excavation, finish excavation, pour perimeter mat, pour basement walls.
What you are talking seems like the logistics is not that simple, if you are asking you do not know the job, you shall not plan it.
In addition to Mike's input, I will add the following:
1) Get your logistics planning, how they will divide the areas for access/movements of equipment, trucks, concrete mixers; you wont have the whole 3300m2 for pouring; there will be leaveout areas for tower cranes, material laydown etc.). This will affect your pouring sequence.
2) Usually, pour the lower floor slab levels first before the higher level slabs.
3) Shop drawing approvals will also affect your pouring sequence... Yoiu will only be allowed to f/r/p concrete in areas where the shop drawings have been submitted and approved.
Hi Vrinda
Insitu concrete is a rolling process of Formwork > Rebar > Joints > Pour > Cure > Strike.
The sequence of Formwork > Rebar is interchangeable depending on the position in the structure.
The work pattern will be decided by the senior engineer and your programme should follow ithe agreed method.
So set up a simple cascade of the tasks linked FS down the chain and then summarise and copy for each work zone.
Then link between summaries in the required order.
A ground slab is usually arranged on a grid that reflects the construction joints and is often poured checker pattern.
Don't forget the underground services and drainage and any lift shafts.
Best regards
Mike Testro
Email: PPadmin@planningplanet.com
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