Deferred Commencement and Priliminary clearance

Hi Satish

Issue 1.

Break your project up into smaller dstances (5km is too long) so that Clearance and Grubbing is a 3 day task and then use a FS link to Embankment for the same distance.

The critical path will then go through Embankment.

Issue 2.

Set up a calendar with a 2 year non work period from day 1 and apply it to the Maintenance section.

Then set up your logic as normal.

Best regards

Mike Testro

Thanks a lot mike for your reply- issue 2 seems resolved. 

As far as the Issue1 is concerned there are many other activities in a 5 Km stretch which I have ignored for the sake of simplicity and the activities are also more time consuming. even if I make the stretch smaller I will not be able to resolve the issue as C&G is going to take even less time when compared to other succeeding activities. So, all I want to do is I want to retain it in the schedule but to commence just before the embankment activity. It is also stated in the contract that C&G shall be done just prior to the commencement of embankment activity to avoid erosion of top soil !-an Environmental issue.

I have an existing carriageway also. If I take 5 km, I will have to depict 32 sections with about 10 activities per section.

i.e., 80/5=16 sections; Sequence: Strengthen and widen the existing section eccentrically to one side then take up one half width of it (say LHS) and complete it and then divert traffic onto the new section and construct/improve the existing section. (16 LHS sections and 16 RHS sections) making total of 32 sections. Further, I have to ensure that I will complete all the culverts/Bridges etc., in that section before the wearing coat is takenup.

Now, if I make it even smaller It is going to be very complex. Do you agree or not??

Hi Satish

I suspect that you are using P6 software and that is not suitable for linear projects such as roadworks.

The only way to make any sense of it is to split it down into smaller lengths and put every successive task in a FS cascade for each length - say 500.00m.

Then cross link every task - this will give you a rudimentary "Time Chain" schedule.

It is not complex even in P6.

Set up one cascade and sumarise it from Lineage 000.00 to (say) 500.00 then copy paste for as many as are required - about 160 summaries?.

Then filter each task and use the multi link to select and link each task FS - you now have a horizontal and vertical logic matrix - the same used in Tilos or Vico.

This should take about 2 hours of a skilled P6 operators time.

You can now apply particular logic for traffic management and any structures deducting task links as required.

Regarding the arisings from the old road? Are you salvaging it for fill? If so that needs to be built into your schedule.

Best regards

Mike Testro

Dear Mike thankyou for taking your valuble time. I am using MSP. I have done it in a similar fashion as you said.  but all the clearing and Grubbing activities are far from the succeeding activities except the first section. How to avoid the gap??

even if i take 500m :

Date 05.08.2013; (say S1A1) C&G is going to take  4hrs, where as embankment S1A2 will take 4days.

C&G S2A1 will commence after S1A1 on 05.08.2013, but embankment S2A2 will commence on 09.08.2013; the gap between C&G and Embankment is increasing which I have to avoid as per contract.

Further, I cannot FS S2A1 with S1A2 as they are resource independent.

Notation used: S1A1 means section 1 Activity 1; similarly SiAj means Section i and Activity j

Regards,

K. Satish Kumar

Hi Satish

If done correctly the grubbing will appear as a continuous set of tasks with a gap of available float before the next longer tasks.

This represents the correct work flow - showing avaliable float.

The big problem with a SS Lead Lag link is that when progress goes beyond the link all downstream logic is lost.

You will have better control using the shorter sections.

Best regards

Mike Testro.

Hi Mike,

I understood your intention of using shorter section; when  i said i was using the same technique you told but with 5 km sections, i forgot to tell i was using a ss relation but not an FS bcoz FS will not be practicable with longer sections, i understand i am wrong. SS is not correct due to distorted logic.

But if such a case as I said (C&G to be done just before embankment) araised what is the best way of depicting it without compromising both contract condition and relationship logic?

Thank you

Hi Sasish

Set it ALAP.

Best regards

Mike Testro

Thank you very much mike.

Hi Satish

You are welcome - any time.

Best regards

Mike Testro