BET403 Cost Engineering Individual Assignment & Group Report 2016 Lecture 4

Individual Assignment and Group Report BET403 Cost Engineering Individual Assignment and Group Report Prepare a tender submission for the following tender: Construction of a 24 km long 1200mm diameter concrete pipeline comprising 16 km from pumping station A to reservoir B and 8 km from B to an industrial consumer C. There is a continuous outcrop of rock from chainage 10 to 13 km TENDER closes at 1:00 pm (13:00) on Thursday 28 April 2016 Rock tip, 5km away Pumping station A Industrial consumer C Reservoir B A rock outcrop B C 10 13 16 24 2016 Lecture 4

Assumptions: 1200DN Class 6 concrete pipes H2 support class BET403 Cost Engineering Assumptions: 1200DN Class 6 concrete pipes H2 support class Average backfill height 2.5m Minimum trench width and clayey sand Rock excavation between chainage 10 and 13 consists of 15% hard rock and 85% medium to soft rock Provide for removal and dumping of excavated rock to tip 5 km away 2016 Lecture 4

Individual Assignment and Group Report BET403 Cost Engineering Individual Assignment and Group Report Task Time required (including Work Break-down Structure and Time/Location diagram) Group Material quantities and costing Individual 1 Labour requirements and costing Individual 2 Plant and equipment requirements and costing Individual 3 Development of project price Tender submission 2016 Lecture 4

BET403 Cost Engineering Group Report Individual Assignment 1: 1. Time required (including Work Break-down Structure and time/location diagram) 2. Materials quantities and costing* 3. Labour requirements and costing* 4. Plant and equipment requirements and costing* 5. Development of project price 6. Tender submission Individual Assignment 1: Materials quantities and costing Individual Assignment 2: Labour requirements and costing Individual Assignment 3: Plant and equipment requirements and costing * Individual Assignments 2016 Lecture 4

Remove and dump excavated rock Skills required Pipelaying team BET403 Cost Engineering Work required Excavate trench Lay pipe Testing Remove and dump excavated rock Skills required Pipelaying team 1 x foreman 3 x machine operators 5 x trades people 4 x labourers Testing team 2016 Lecture 4

BET403 Cost Engineering Notes 2016

Quantities Source: Humes Concrete pipe reference manual BET403 Cost Engineering Quantities Source: Humes Concrete pipe reference manual 2016

Given: Quantities BET403 Cost Engineering 1200DN Class 6 concrete pipes H2 support class Average backfill height 2.5m Minimum trench width and clayey sand Quantities Quantities ‘out’ - Excavation quantities Hard rock Medium to soft rock Clayey sand Quantities ‘back in’ Bedding quantities Haunch quantities Compacted ordinary fill quantities Backfill quantities Pipe Source: Humes Concrete pipe reference manual 2016

BET403 Cost Engineering Source: Humes Concrete pipe reference manual 2016

Effect of excavation and compaction BET403 Cost Engineering Effect of excavation and compaction Excavation: increased volume – bulking or swelling Compaction: decreased volume - shrinking One cubic excavated does not translate to one cubic loose or one cubic compacted 0.95 m3 compacted 1 m3 bank/ in-situ 1.25 m3 loose/ excavated Shrinking Bulking 2016

Bulking and shrinking Bank material: Loose material: BET403 Cost Engineering Bulking and shrinking Bank material: Soil that is in its natural, or in situ, state before disturbance Measured as bank cubic meters Loose material: Soil that has been disturbed and is no longer in its original state Measured as loose cubic meters Compacted material: Soil that has been compacted for use in construction projects Measured as compacted cubic meters Source: https://etd.auburn.edu/bitstream/handle/10415/3532/Crooks,%20Alexandria_MS%20Thesis_Spring%202013.pdf?sequence=2 2016

Bulking (Swell) Factor (%) BET403 Cost Engineering Shrink factor SF = (volume of in-situ material – volume of compacted material) volume of in-situ material Bulk factor BF = (volume of loose material – volume of in-situ material) Example: Bulking of excavated materials After excavation of 300 m3 clay the volume of loose clay material swells to 420 m3 in the dump Bulking factor = (420 – 300)/ 300 = 0.4 = 40% Material In-situ Density 103 (kg/m3) Bulking (Swell) Factor (%) Clay 1,800 – 2,600 20 - 40 Granite 2,600 – 2,800 75 - 80 Sand, dry 1,600 20 - 30 Sand, wet 1,950 Sandstone 2,100 – 2,400 Soil 1,200 – 1,600 Source: http://www.engineeringtoolbox.com/soil-rock-bulking-factor-d_1557.html 2016

LE > LP Excavated volume = LE x d x w BET403 Cost Engineering LP Plan A w A LE > LP d LE Elevation B B B A A Excavated volume = LE x d x w B 2016