Basement & Waterproofing
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1 Basement & Waterproofing
2 Lecture Outline
3 1. What can basements be used for?
4
5
6 So, basements can provide...space additional in a building and thereby enhancing the quality... of life of occupants.
7 What are the loads that are acting on a basement?
8 What are the issues arising during excavation works? 1. What are you going to find during excavation 2. Temporary/permanent soil support 3. Keeping the water out!
9
10
11 3. Methods for basement construction Open excavation Bored pile walls (Contiguous Piling ) Diaphragm Walling
12
13 Open excavation
14 Open excavation Using open excavation with temp support usually steel sheet piles Sides being battered to angle of repose Construction is carried out and then Backfill after construction
15 Interlocking sheet piling
16 Interlocking sheet piling Interlocking steel sheet piles driven into ground To obtain continuous barrier in the ground so that permanent work can proceed Methods Sheet piles driven into ground Excavation between steel sheet piling in stages Ground anchors installed at regular intervals Excavation to formation level Basement construction Steel sheet can either be withdrawn or left in as permanent ground water control
17 Interlocking sheet piling Advantages Watertight Safe Quick Suitable for congested site Suitable for deep excavation Simple, less obstruction Suitable for most soil types Disadvantages Noisy Not economical for big one-off project
18
19 Drilling rig
20 Similar to diaphragm wall Bored Piling Closely spaced precast/ bored piles are used to form perimeter retaining walls Diameter varies from mm
21 Bored Pile walls piling rig in Continuous Flight Auger (CFA) mode The range of CFA piles is between 300mm and 1200mm in diameter and can be created up to 30 meters long.
22 Rotary Bored Piling piling rig in rotary bored piling mode For larger diameter piles up to 3000mm rotary flight auger systems can be used, but these are not continuous flight and the soil has to be brought to the surface in sections.
23
24
25 Diaphragm Walls Retaining walls construction Diaphragm walls are typically 20m to 50m deep, but may extend to considerably greater depth.
26 Diaphragm walls
27
28 Retaining walls construction Diaphragm Walls Advantages Watertight No underpinning of adjacent properties necessary No noise / vibration problem For congested site For deep excavation Min.movement of pavement, road and services Can form part of basement structure Disadvantages Mud sediment at trench base might not be displaced completely by concrete Finished walls in gravel soils expected to be rough Uncertain quantity of concrete needed Larger tolerance of concrete cover is necessary Concrete to be placed continuously to avoid trapping mud in the body of wall Construction is slow / can be expensive
29
30 Responsibilities for safety, quality and the environment Risk management Working platforms Pile trimming Essential design requirements Ground conditions Workmanship
31 What are the ICE Health and Safety specifications for piling and retaining walls work?
32 3. Waterproofing
33
34 The image below shows various water penetration points. Nearly every one of these are present in the modern basement in some form or another.
35 What are the signs of water seepage through a basement?
36 Internal tanking Tanking is applied to the inside face of the slab and walls.
37 External tanking
38
39 Tanking Method Waterproof membrane materials: Mastic asphalt Polythene sheeting Bituminous compound Epoxy resin Bitumen laminates
40 Eg of Page 11 Basement Waterproofing Details Cross Section Use Tanking Method
41 Eg of Page 11 Basement Waterproofing Details Cross Section Use Tanking Method
42 Example of Pile Layout Plan
* The use of these areas can vary from car park space, where little waterproofing is required through to store rooms or plant rooms where a high
1 2 Demand for space in cities often makes it essential to use space below buildings. The concept of deep basement technology has been employed since the middle of last century, but is becoming more popular
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