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Hook Time Analysis

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Andrew Owenson
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I am trying to carry out a hook time analysis on a insitu concrete frame. We are trying to establish which subcontractor is more realistic, one is saying 3 cranes the other four. Has anyone got a worked example of a similar exercise?

 

Many Regards

Andrew

Replies

Mike Testro
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Joined: 14 Dec 2005
Posts: 4215

Hi Derrick

This is my own formula which is used in conjunction with Asta PowerProject.

Once you have researched the variables for the specified crane then the result is used as a resource added to tasks requiring crane use.

The Histogram will need to be levelled when the total hooks per day is known.

Best regards

Mike Testro

Best regards

Mike T.

Derrick Anim
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Dear Sir, i am a beginner and i want to know how u came about this analysis and it importance?

Umer Mehmood
User offline. Last seen 8 weeks 5 days ago. Offline
Joined: 19 Jun 2008
Posts: 23

Dear all

 

I am just a beginner  , can any one advise me what " Hook Time " Means  " Hooks per Day " 

Thank you 

Mike Testro
User offline. Last seen 3 days 23 hours ago. Offline
Joined: 14 Dec 2005
Posts: 4215

Hi Andrew

This topic is part of module 9 in the Advanced Planning set in Planning Acaemy tuition modules.

The following sections are the basic formulas for a 4 story concrete frame with brick cladding.

DO NOT USE these examples for your project - do your own research into the variables.

The calculations need a programme resource on your barchart called hooks which is applied to all tasks that need crane use - don't forget the formwork tables which all need hook time.

Part 1 Crane Capacity:

 

Luffing Crane    
Typical Capacity for a Small Crane  
     
Max Load 5 tonne
Min Load 1.5 tonne
     
Operation Time  
Sling Up 5 mins
Hoist 4 mins up
Discharge 3 mins
Hoist 2 mins down
Cycle 14 mins
Hoist per Hr 4  
Work hrs per day 6  
Hooks per day 24  

Part 2 Crane Usage

 

 

Code Tower Crane Usage Days Hooks
xx Tower Crane Erect xx  
3 Column Rebar 3 1
1 Column Pour 1 28
4 Slab Rebar 3 4
2 Pour Slab 1 0
3 Column Rebar 3 1
5 Strike Forms 2 4
1 Column Pour 1 28
5 Slab Forms 3 4
4 Slab Rebar 3 4
2 Pour Slab 1 0
3 Column Rebar 3 1
5 Strike Forms 2 4
7 Internal Blockwork L0 5 1
6 External Brick Work Lift 01 8 1
1 Column Pour 1 28
5 Slab Forms 3 4
6 External Brick Work Lift 02 8 1
4 Slab Rebar 3 4
2 Pour Slab 1 0
3 Column Rebar 3 1
5 Strike Forms 2 4
7 Internal Blockwork L1 8 1
6 External Brick Work Lift 03 8 1
9 Load Out L1 2 4
1 Column Pour 1 28
5 Slab Forms 3 4
7 External Brick Work Lift 04 8 1
4 Slab Rebar 3 4
2 Pour Slab 1 0
3 Column Rebar 3 1
9 Load Out L2 2 4
7 Internal Blockwork L2 8 1
1 Column Pour 1 28
6 External Brick Work Lift 05 8 1
5 Slab Forms 3 4
4 Slab Rebar 3 4
6 External Brick Work Lift 06 8 1
2 Pour Slab 1 0
5 Strike Forms 2 4
7 Internal Blockwork L3 8 1
9 Load Out L3 2 4
6 External Brick Work Lift 07 8 1
8 Install Roof Plant 5 1
6 External Brick Work Lift 08 8 1
7 Internal Blockwork L4 8 1
7 External Brick Work Lift 09 8 1
9 Load Out L4 2 4
6 External Brick Work Lift 10 8 1
6 External Brick Work Parapet 4 1

Part 3 Hook Numbers

 

Code Material Type Volume   Container Capacity Hooks Programme Tasks Hooks per Use Work Days Hooks Per day  
1 Concrete in Columns 110 m3 Skip 0.8 138 5 28 1 28  
2 Concrete in Slabs 522 m3 Skip 0.8 653 5 131 1 131 <<<< Pump
3 Rebar in Columns 14 tonne Sling 1.2 12 5 3 3 1  
4 Rebar in Slabs 69 tonne Sling 1.2 58 5 12 3 4  
5 Table Forms 75 unit unit 1 75 8 10 3 4  
6 External Brick m2 42750 nr pallettes 624 69 9 8 8 1  
7 Internal Block 2640 nr palletes 80 33 7 5 8 1  
8 Roof Plant 5 units unit 1 5 1 5 5 1  
9 Internal Heavy 30 units unit 1 30 4 8 2 4  

This requires 1 luffing jib crane use a factor for more than one crane to adjust the hooks per hour ratio per day.

Best regards

Mike Testro