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Steel pile day 20.05.2010. RD-PILE WALL – NEW WAY TO BUILD Lars Johansson Ramboll Sverige AB in co-operation with Juha Forsman Ramboll Finland Ay. Title slide. AMC – Analysis Modelling Calculation Group. Bygg- konstruktion. Geokonstruktion. Grundvatten-
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Steel pile day 20.05.2010 RD-PILE WALL – NEW WAY TO BUILD Lars Johansson Ramboll Sverige AB in co-operation with Juha Forsman Ramboll Finland Ay Title slide
AMC – Analysis Modelling Calculation Group Bygg- konstruktion Geokonstruktion Grundvatten- Ytvatten- Dagvatten- Spill Trafik
AMC – Analysis Modelling Calculation Group Samverkansanalyser – samverkan mellan jord och konstruktioner. Nära samarbete mellan geotekniker och konstruktörer Eurokoder (EC7) Funktionsdesign mer än brottdesign Krav på mer avancerade analyser (finita element analyser) Särskild satsning med bas i Malmö Spänner över Norden, Baltikum och UK Samarbete (andra aktörer på marknaden, Högskolor/Universitet/ Forskningsinstitut) Bättre kvalitet
EXAMPLES OF ”TRADITIONAL” SHEET PILE WALL Content slide, two columns with image
TRADITIONAL BUILDING PIT SUPPORTED BY SHEET PILE WALL pit boundary fill rock anchors sheet pile wall clay moraine • Insecure method to penetrate through rocky boulderly soil layers = contact to bedrock through moraine is often hard to achieve • Outer walls of building must have their own foundations • Basement walls cannot extend to the boundary of the excavation pit (sheet pile wall requires space) • Many support levels (struts). Steel bars/dowels are needed for anchoring of the lower end into bedrock • Problems to control ground water
TRADITIONAL SOLUTION NEW, ALTERNATIVE SOLUTION plot boundary fill rock anchors clay RD-pile wall moraine bedrock
ACHIEVED BENEFITS • RD-pile wall can be installed near the excavation boundary and ”in open space” in plot boundary • Distance of ground water flow increases => amount of water decreases. Water-tight structure as a whole. • Act as bearing structure (foundations, basement wall, good stiffness) • External anchoring is not allways needed (for instance upper deck acts as inside strut) • Penetration of all soil layers • Contact to bedrock is secured
example 2: BUILDING SITE AND DESIGNED UNDERGROUND SPACE GW Tä Sa Mr
2. INSTALLATION OF REST OF THE DRILLED PILES AND CONSTRUCTION OF FIRST LEVEL FLOOR GW
3. EXCAVATION OF FIRST BASEMENT LEVEL AND CONSTRUCTION OF FLOOR DECK GW
4. EXCAVATION AND BLAST BREAKING OF SECOND BASEMENT LEVEL AND CONSTRUCTION OF FLOOR DECK GW
THANK YOU Endslide.