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
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
Enhancing of fire protection with Shotcrete 05.09.20173
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
Enhancing of fire protection with Shotcrete 05.09.2017
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
Enhancing of fire protection with Shotcrete 05.09.2017
Project introduction – Tunnel Lüdenscheid
5
4,95 m
Enhancing of fire protection with Shotcrete 05.09.20176
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
Enhancing of fire protection with Shotcrete 05.09.2017
Start, t = 0 min
Deformation figure
Temperatur
development in
concrete stucture
80 cm
Calculation of fire protection
Bending moments via
Non-linear calculation
7
Enhancing of fire protection with Shotcrete 05.09.2017
80 cm
Fire case, t = 1 sec
Deformation figure
Temperatur
development in
concrete stucture
Calculation of fire protection
Bending moments via
Non-linear calculation
8
Enhancing of fire protection with Shotcrete 05.09.2017
80 cm
Fire case, t = 10 min
Deformation figure
Temperatur
development in
concrete stucture
Calculation of fire protection
Bending moments via
Non-linear calculation
9
Enhancing of fire protection with Shotcrete 05.09.2017
80 cm
Fire case, t = 30 min
Deformation figure
Temperatur
development in
concrete stucture
Calculation of fire protection
Bending moments via
Non-linear calculation
10
Enhancing of fire protection with Shotcrete 05.09.2017
Calculation of fire protection
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
Enhancing of fire protection with Shotcrete 05.09.2017
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
Enhancing of fire protection with Shotcrete 05.09.201713
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
Enhancing of fire protection with Shotcrete 05.09.2017
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
Enhancing of fire protection with Shotcrete 05.09.2017
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
]
Enhancing of fire protection with Shotcrete 05.09.201716
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
Enhancing of fire protection with Shotcrete 05.09.2017
• 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
Enhancing of fire protection with Shotcrete 05.09.2017
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
Enhancing of fire protection with Shotcrete 05.09.2017
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
Version 4 – Spray-Applied Fire Resistive Material
Layer of the fire resistive Shotcrete
tunnel ceiling
Fendolite MII
reinforcement
Stainless steel mesh as reinforcement
Enhancing of fire protection with Shotcrete 05.09.2017
Version 4 – Spray-Applied Fire Resistive Material
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
Enhancing of fire protection with Shotcrete 05.09.201721
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
Enhancing of fire protection with Shotcrete 05.09.201722
Version 4 – Spray-Applied Fire Resistive Material
Application of the fire
resistive shotcrete
Example of construction in a tunnel
in London
Sourc
e:
ww
w.p
rom
at-
tun
nel.com
Enhancing of fire protection with Shotcrete 05.09.201723
• 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
Enhancing of fire protection with Shotcrete 05.09.2017
Vielen Dank für Ihre
Aufmerksamkeit!
24
Thank you for your attention
Stefan Peters M.Sc.
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