Ct tutorial 2
- 1. BLD 60104 CONSTRUCTION TECHNOLOGY 1 Site and Temporary Works Leong Li Jing 0323628 Gillian Chong 0323941 Chia Sze Sian 0323574 Chan Qi Han 0324315 Yap Zheng Xiang 0322411 Michelle Tung Man Kaye 0324175
- 2. Accessibility to Site Accessible routes from all entrances and exit for construction and public use New sites or existing sites Conditions: - Slope - Bends - Sharp corners - Gradient - Width
- 3. Services Actions: Planning the works Locating and identifying buried services Safe excavation Examples: Electricity cables Water pipes Gas pipes Telecommunication cables
- 4. Facilities School Fire station Playground Bus station Hospital Police station
- 5. Water Table High Water Level Low Water Level Water pressure in the soil is high and likely to be corresponding weaker Water pressure is low and cause the soil to Affect the stability of slopping ground Lose most of the moisture will cause building to crack Surrounded by areas of higher ground, underground water tend to flow to the site *save more costs and laborer work Causes flooding *necessary to pump excavations and provide drainage to remove the water *which will need additional costs
- 6. Sub-Soil Types of Soil Advantage Disadvantage Hardrock Great Foundation Characteristics High Excavation Costs Gravel Strong and Easily Drained Bearing capacity halved when water table is high Clay Good Bearing Capacity Does not Drain Well Sand Cheap excavation Loose
- 7. Site clearance ■ Removal of bushes and trees ■ Removal of soil to reduce level ■ Demolition of existing building ■ Plants that can be use for demolition a) Back-hoe b) Lorries c) bulldozer
- 8. Site setting out ■ Establish a baseline a) Mark the position of line b) Measure on-site by using steel tape ■ Setting out main line a) Mark each corner of the building by using stout peg b) Make sure the angles and lengths are right ■ Setting up profile board a) Foundation trench positions and walls
- 9. Temporary works 1. Accommodation For Workers ■ This facility will be strategic to the progress of the project because it allows workers to live close to their work sites. This will help them stay within reach of their ultimate goal, notably by avoiding unnecessary trips
- 10. 2. Security ■ Fencing - defines the limit of the site - deterrent to trespasser Temporary works
- 11. Types of Scaffolding 1) Putlog Scaffolding: ■ Standards are joined together with horizontal members. ■ Spacing is the same on a putlog scaffold as on a general purpose scaffold. ■ The building supports the scaffolding. 2) Independent Scaffolding: • 2 rows of standards at about 1m apart are tied by cross-members-transform because it does not rely on the building. • Diagonal braces are fitted between standards to give stability.
- 12. 3) Mobile Access Tower: ■ Workers have easier access to buildings for constructing purposes ■ Able to move manually on ground and workers are free standing when on the platform ■ Safe and adaptable style of scaffold that is nicely suited to perform around the typical house like bungalows.
- 13. Timbering There are 3 main components of timbering: a) Poling boards ■ When the soil is soft, such as soft clay or sand, it will be necessary to use more closely spaced poling boards to prevent the sides of the trench between the struts from falling in. b) Walings ■ Running the length of trench and support poling boards c) Struts ■ It used to put across the width of the trench, supporting open poling boards, close poling boards and walings or poling boards and sheeting
- 14. THANK YOU