Concrete renovation and enhancing of fire protection of an ...

Engineering Conferences InternationalECI Digital ArchivesShotcrete for Underground Support XIII: NewDevelopments in Rock Engineering, Tunneling,Underground Space and Deep Excavation

Proceedings

9-5-2017

Concrete renovation and enhancing of fireprotection of an existing tunnel with sprayablepolymer cement concrete (SPCC)Stefan PetersIMM, Germany, [email protected]

U. VersenIMM, Germany

Stefan PetersIMM, Germany

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Recommended CitationStefan Peters, U. Versen, and Stefan Peters, "Concrete renovation and enhancing of fire protection of an existing tunnel with sprayablepolymer cement concrete (SPCC)" in "Shotcrete for Underground Support XIII: New Developments in Rock Engineering,Tunneling, Underground Space and Deep Excavation", Dietmar Mähner, Institute for Underground Construction, FH Münster,Germany Matthias Beisler, ILF Consulting Engineers, Asia (Thailand) Frank Heimbecher, Institute for Underground Construction,FH Münster, Germany Eds, ECI Symposium Series, (2017). http://dc.engconfintl.org/shotcrete_xiii/11

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mailto:[email protected]

Concrete renovation and enhancing of fire protection of

an existing tunnel with shotcrete

IMM Maidl & Maidl, Consulting Engineers

Stefan Peters M.Sc.

- Tuesday, 05.09.2017 -

Enhancing of fire protection with Shotcrete 05.09.20172

Structure

1. Project introduction

2. Calculation of fire protection

3. Current standards for tunnel fire protection

4. Evaluation of enhancing fire protection systems

5. Application of fire resistant shotcrete


Structure







Project introduction – Tunnel Lüdenscheid

4

• Historical city center tunnel (1971)

• Length: 342 m

• 2-cell rectangular-frame

• Concrete B300 / B450

No fire resistance City center above the tunnel

East portal of Tunnel Lüdenscheid

Concrete lining without additional fire protection


Project introduction – Tunnel Lüdenscheid

5

4,95 m


Structure







Start, t = 0 min

Deformation figure

Temperatur

development in

concrete stucture

80 cm

Calculation of fire protection

Bending moments via

Non-linear calculation

7


80 cm

Fire case, t = 1 sec

Deformation figure

Temperatur

development in

concrete stucture


Bending moments via


8


80 cm

Fire case, t = 10 min

Deformation figure

Temperatur

development in

concrete stucture


Bending moments via


9


80 cm

Fire case, t = 30 min

Deformation figure

Temperatur

development in

concrete stucture


Bending moments via


10



11

• Hindering of thermal expansion causes huge internal forces

• Internal forces of a concrete slab in fire case

Strain

constraint

force

Temperture in

concrete slab

Concrete slab cross section with temperature curve


Diversion: Heat vs. Concrete

12

Reinforced concrete:

• Outer Layers heated

• water evaporates

• Spalling occurs

• Exposure of rebars

• Lost strength

Concrete affected by spalling vs.

undeformed concrete

Sourc

e:

Hun,

S e

t al.:

Spalli

ng p

revention

measure

s o

f hig

h p

erf

orm

ance c

oncre

te


Structure







Current standards for tunnel fire protection

14

• German standards

Structural stability in case of fire

Serviceability after fire

Structural measures

Rebars temp < 300°C

cnom = 6cm

PP-fibres

No enhancing fire

protection proposals

No European

guidelines

No details how to pass

fire tests


Current standards for tunnel fire protection

15

Fire curve (ZTV-ING)

ZTV-ING fire curve

Retrieved from: ZTV-ING

Part 5-1

Duration [min]

Te

mp

era

ture

[°C

]


Structure







• V1: Linings

Known as fire protection

Rigid sub structure

Covers cracks

• V2: PCC/SPCC (synthetic compounds)

Greater thickness

No fire protection experience

• V3: PP-Fibre Shotcrete

No fire tests little experiences

Realcalisation

• V4: Sprayed on fire protection

No European registration for tunnel constructions

Minimal thickness

Enhancing fire protection systems

17

Fire resistance panels

Fire resistance shotcrete


Version 4 – Spray-Applied Fire Resistive Material

18

Product: Cafco Fendolite – MII (Promat)

(or similar products)

• Light weight shotcrete

• Components:

cement (binder)

Vermiculite:

Not inflammable

Thermally isolating

• Thin layers


Application

• Bonding Latex

Application as adhesive primer

• Mesh reinforcement

Tests without reinforcement

For long term durability lightweight mesh

• Retaining Anchors

Holding reinforement in place

19


Layer of the fire resistive Shotcrete

tunnel ceiling

Fendolite MII

reinforcement

Stainless steel mesh as reinforcement



20

Provide fire protection for structural steel and concrete

Benefits:

• Proven durability

• Also applied in oil and gas industry

• Lightweight

• Leaking spots not covered

• Prevents concrete spalling

Offshore oil platform – potential area of

application for fire protection shotcrete


Structure








Application of the fire

resistive shotcrete

Example of construction in a tunnel

in London

Sourc

e:

ww

w.p

rom

at-

tun

nel.com


• 40 mm sprayable light weight fire protection material

• Ceiling and upper wall areas

• Realkalisation by SPCC

• Lower walls

Application in Tunnel Lüdenscheid

Application of the fire resistive shotcrete in Tunnel Lüdenscheid


Vielen Dank für Ihre

Aufmerksamkeit!

24

Thank you for your attention

Stefan Peters M.Sc.

Concrete renovation and enhancing of fire protection of an ...

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