Measure Daily Productivity

Hi Shareef

Usually the measures is Tonnes per hour per fixer.

Poductivity depends on if the rebar is prefabbed off site or fixed in situ.

Best regards

Mike Testro

depends on the type of structure, there are many factors to consider. First identify which activities of the assembly takes longer (transport, welding, bracing, lifting, torquing). .. Generally used tons / day

Regards,

Juan Luis

Hi Milke & Juan

I would like to know, how do we estimate (measure) how many tonnes/day has been executed by the group (lets say 10 steel fixers) and the rebar has to be fixed on site.

I do not think the crew is gonna weigh the steel before fixing it  !!  :D

Thanks for your quick response.

Best Regards

Shareef A Azeez

Hi Shareef

In your contract documents there will be something called a "bending schedule" which will list every bit of rebar on the job - where it is - and what it weighs (probably in kilograms).

Get hold of this documents and convert the data to a spreadsheet - Lotus 123 is best - and then taking note of the location - cross reference the rebar weight to the fixing tasks.

You may need your WBS codes to help with this operation.

So rebar bending schedule says 1.35 tonnes to columns type 6.

You should know where column type 6 is on your programme - if you don't know then give up now.

Set up a resource - not modelled -  called rebar fixing and copy paste all the 123 data to your bar chart.

You will now have a target programe for rebar fixing.

This can be compared to what is actually being achieved on site when the daily reports show how much rebar is fixed where.

This common requirement is fully covered in Planning Academy which will be launched very soon.

Best regards

Mike Testro

Shareef,

You can estimate the amount of reinforcing steel placement by relating it to the concrete elements of your particular job. At home, we use cwt. or hundred pounds per cubic yards. Our average for an earthquake zone as ours using ACI (American Concrete Institute) Codes it is about 1.80 cwt/CY but it varies within jobs, therefore we estimate the quantities per job by first estimating the ratios for each element and from concrete volumes then we estimate total reinforcing steel. Estimating every particular detail is too granular for purposes of most estimates.

The following tables are from an actual estimate. The first table are part of our computations for the determination of steel ratios, the next one is a summary table for the job concretes. Beware these ratios are for a particular job that is mostly a post-tensioned structure so some ratios are low as a significant portion of reinforcement supplied by post tensioning tendons are under separate quantities and cost items.

You might notice some difference between the above table and the summary table, it would be because in our worksheet we applied several ratios to different column types, different sections with different sizes as in the case of small rectangular columns versus large rectangular or round columns.

From the ratios particular to your job you can reasonable estimate how much steel was placed if you know how much concrete volume was prepared, we even use concrete placed to estimate reinforcing steel placed, on average they run in parallel.

Ask your estimator for the ratios particular to your job. Keep it simple.

Regards,

Rafael

Hi,

Previously, doing similar work. First measuring the lengths of the beams columns, etc ... and then calculate the weights using tables. It is very useful to have these tables in Excel. After a few codes assigned to the elements (tag) and relating to the plane. Then, create activities and relationships with their respective codes to activities. These activities prepare a schedule .... and this could have the ratio of tons per day.

Definitely has to be measured at the beginning and work hard to excel or lotus123.

Regards,

Juan Luis

PD:excuse my english

Hi:

Rafael explain it better,

Regards,

Juan Luis

Hi Azeez,

If knowing the productivity is your goal,

1) The quantity issued to the party can be obtained from the stores.

2) The no of fixers worked each day during a particular period can be obtained from the DPR given the site Engineer.

You can roughly estimate using them. From the above data you can arrive the productivity per ton per fixer.

however, productivity for fixing and bending should be done seperately. In my experience, bending can be done quickly, fixing takes more time.

hope this helps 

K

Thankyou Gentlemen !!!! for your valuable guidance..

" From the ratios particular to your job you can reasonable estimate how much steel was placed if you know how much concrete volume was prepared, we even use concrete placed to estimate reinforcing steel placed, on average they run in parallel."  ..........
               This is what I was looking for.....have to specially thank  "Rafael" on this.....

Best Regards

Shareef A Azeez

HI,

Howmuch the daily productivity rate for fixing of Kerbstone and Interlock pavement

Regards

Gobinath