Trenchless Construction · 2019. 1. 11. · [DIN EN 13941:2007] Cyclic interaction . EN13941:2003,...
Transcript of Trenchless Construction · 2019. 1. 11. · [DIN EN 13941:2007] Cyclic interaction . EN13941:2003,...
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Trenchless Construction for District Heating networks
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+
Source: Weidlich
Combining Trenchless Technology and
District Heating
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Trenchless Technology: Installation problem.
District Heating pipelines: Operation problem.
Source: AGFW
Combining Trenchless Technology and
District Heating
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Source: Weidlich, BRUGG
Steel medium pipe
PUR insulation foam
PE-coating
Characteristics of District Heating pipes
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Structural analysis is required, because of
Temperature up to 140°C,
Pressure of 25 bar,
Pipe – soil interaction.
Source: EN13941
Structural Analysis
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[DIN EN 13941:2007]
- friction forces f – u (axial interaction)
- bedding pressure p – v (lateral interaction)
F
fu
uu u
p
pu
vu v
Source: AGFW
Characteristics of DH pipelines
[Foto: Weoidlich]
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)0(MMtH EAN
)0(Ru
)0(MMt
GF
EA
l
2
l
EA
Fw
2G
)0(Ru
max
Normal stresses in the adhering section:
Length of the gliding section:
Maximum displacement:
z,w
x,u
+
0 friction forces
adhering section gliding section
(pressure)
District heatingpipeline
Axial displacement w
Normal force N
Source: AGFW
Characteristics of DH pipelines
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D
H r
2
02* d
DF rRu
2
1*
2*
kDHm
m
RohrRu G
kDHDF ''2
1*
2****
Source: Weidlich
Characteristics of DH pipelines
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Contact pressure is not clearly understood.
Main influences:
• Acting earth pressure
• Use of bentonite suspensions
• Temperature
• Time / Durability of the pipe
Because of that, the use of trenchless technology in the DH sector is still seen
with caution. In Germany today ATV A 161 is used.
Source: Weidlich
Contact pressure
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30 years of service lead to cyclic loads.
Pipe type Equivalent full action cycles in
30 years according to EN13941
Major pipelines 100
Main pipelines 250
House service
connections
1000
[DIN EN 13941:2007]
Cyclic interaction
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EN13941:2003, „Design and installation of preinsulated bonded pipe systems
for district heating
EN253:2009, „District heating pipes – Preinsulated bonded pipe systems for
directly buried hot water networks – Pipe assembly of steel service pipe,
polyurethane thermal insulation and outer casing of polyethylene“
FW401:2007, „Laying and structural analysis of plastic jacket pipes for district
heating networks “
ATV127:2000, „Statische Berechnung von Abwasserkanälen und -leitungen“
FW420:2004, „Part 1 bis 5, „Flexible district heating pipeline systems “
EN489:2009, „District heating pipes - Preinsulated bonded pipe systems for directly
buried hot water networks - Joint assembly for steel service pipes, polyurethane thermal
insulation and outer casing of polyethylene.“
Source: Weidlich
Standard and technical rules
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Pipe quality requirements: PE-coating Strong interaction between soil and pipe during installation
Source: BRUGG Pipesystems
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Strong interaction between soil and pipe during operation
Coarse soil environment will affect the pipe coating
and the joints due to cyclic loading.
Source: FFI
Pipe quality requirements: PE-coating
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Pipe quality requirements: Joint systems
Damage of joints after 23
cycles in laboratory test
using rough bedding material
Source: AGFW, FFI
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Stress-strain coupling between the medium pipe,
insulation foam and the PE-coating is necessary.
The allowed shear stress in the foam is tax<0,04
MPa for operation.
The possible pulling forces are restricted by the maximum shear
stress in the PUR-foam.
Pipe quality requirements: PUR-foam
Source: AGFW
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Pipe curving means additional bending and stress in the pipe
sDCR adesign
bzul
aelast
2
D ER
Source: AGFW
Pipe quality requirements: Steel medium pipe
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Characteristics of trenchless technology
Use of bentonite slurries as a friction reducer.
Source: TRACTO TECHNIK
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Reduction of technological barriers
Temperature dependence of bentonite suspensions for drilling
Classification tests showed no influence of the temperature for
typical coating temperatures of 20°, 30° and 40° degrees.
Source: IGth
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In some tests a temperature dependent behaviour of bentonite-sand
mixture was observed.
Coefficient of friction for 40° C drying
0,29
0,33
0,37
0,42
0
0,05
0,1
0,15
0,2
0,25
0,3
0,35
0,4
0,45
PE + Sand + Bentonite
(fresh)
PE + Sand + Bentonite
(2d drying)
PE + Sand + Bentonite
(10d drying)
PE + Sand
Co
eff
icie
nt
of
fric
tio
n
Reduction of technological barriers
Source: IGth
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Outlook
Combining Trenchless Technology and District Heating is promising for
preinsulated bonded district heating pipes.
Combining Trenchless Technology and District Heating
Source: BRUGG