20th MAY 2010

RUUKKI STEEL PILE DAY STOCKHOLM

Steel pile day 20.05.2010

RD-PILE WALL – NEW WAY TO BUILD

Lars JohanssonRamboll Sverige ABin co-operation withJuha ForsmanRamboll Finland Ay

20th MAY 2010

RUUKKI STEEL PILE DAY STOCKHOLM

AMC – Analysis Modelling Calculation Group

Grundvatten-Ytvatten-

Dagvatten-Spill

Bygg-konstruktionGeokonstruktion

Trafik

20th MAY 2010

RUUKKI STEEL PILE DAY STOCKHOLM

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

20th MAY 2010

RUUKKI STEEL PILE DAY STOCKHOLM

EXAMPLES OF ”TRADITIONAL” SHEET PILE WALL

20th MAY 2010

RUUKKI STEEL PILE DAY STOCKHOLM

TRADITIONAL BUILDING PIT SUPPORTED BY SHEET PILE WALL

•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

fill

clay

moraine

rock anchors sheet pile wall

pit

boundary

20th MAY 2010

RUUKKI STEEL PILE DAY STOCKHOLM

NEW, ALTERNATIVE SOLUTION

TRADITIONAL SOLUTION

fill

clay

moraine

rock anchors

plo

t boundary

bedrock

RD-pile wall

20th MAY 2010

RUUKKI STEEL PILE DAY STOCKHOLM

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

20th MAY 2010

RUUKKI STEEL PILE DAY STOCKHOLM

example 2: BUILDING SITE AND DESIGNED UNDERGROUND SPACE

GW

Sa

Mr

Tä

20th MAY 2010

RUUKKI STEEL PILE DAY STOCKHOLM

1. INSTALLATION OF RD-PILE WALL

GW

20th MAY 2010

RUUKKI STEEL PILE DAY STOCKHOLM

2. INSTALLATION OF REST OF THE DRILLED PILES AND CONSTRUCTION OF FIRST LEVEL FLOOR

GW

20th MAY 2010

RUUKKI STEEL PILE DAY STOCKHOLM

3. EXCAVATION OF FIRST BASEMENT LEVEL AND CONSTRUCTION OF FLOOR DECK

GW

20th MAY 2010

RUUKKI STEEL PILE DAY STOCKHOLM

4. EXCAVATION AND BLAST BREAKING OF SECOND BASEMENT LEVEL AND CONSTRUCTION OF FLOOR DECK

GW

20th MAY 2010

RUUKKI STEEL PILE DAY STOCKHOLM

5. AT A SAME TIME CONSTUCTION UPWARDS IS POSSIBLE

GW

20th MAY 2010

RUUKKI STEEL PILE DAY STOCKHOLM

THANK YOU