challanges in smart energy transport by using trenchless technology · 2019-04-22 · folie 1 von...

25.08.2015 4DH Copenhagen Folie 1 von 12 www.fernwaerme.de

CHALLANGES IN SMART ENERGY

TRANSPORT BY USING TRENCHLESS

TECHNOLOGY

Dr.-Ing. Ingo Weidlich

[email protected]

Tel. +49 511 943 70-25


Energy conception of the German federal government 2010:

Background – Energy concept


Background – Power concept

Today:

Small Pilot routes for 380 kV

Source: Amprion

Source: Amprion


Background – Heating concept

Combined heat and power (CHP) act (KWKG)

Target: Increase the share of CHP to 25% until 2020

127,7 123,4 116,0 104,8 90,8 79,9 73,2 69,3 67,4

29,026,2

22,720,0 18,3 17,3 16,8 16,5

77,9

85,6 83,3 81,9

21,1

122,9

175,9

169,7

157,4

142,8127,4

111,696,6

15,7

29,2

38,5

34,1

31,2

29,728,6

27,7

66,1

30,9

14,1

115,4109,4

97,590,2

0,8

0,9

1,2

2,0

2,0

2,12,3

2,5

2,6

127,7

338,0

313,5292,0

367,2

401,4

443,8461,1

370,4

192,1

0

40

80

120

160

200

240

280

320

360

400

440

480

520

2005 2010 2015 2020 2025 2030 2035 2040 2045 2050

Po

ten

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PJ

/a]

FW Bestand FW NetzverdichtungFW Netzerweiterung FW Netzerweiterung VariationErschließung neuer Gemeinden Erschließung neuer Gemeinden VariationErschließung von Neubausiedlungen

Po

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and in h

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What is trenchless Technology?

Source: Dr. Hans-Joachim Bayer


• All power cables from 1 kV to 220 kV are approved (380 kV to 400

kV are not approved for HDD)

• 1 kV, 5 kV, 10 kV, 20 KV, 30 kV are possible in bundles in one

drilling

• 60 kV, 110 kV and 125 kV need pilot drilling and backreaming

(3 times boring)

• 220 kV are single drillings (attention to distance), this means 3 times

boring for one cable

• Direct laying and laying in protective pipe

• 380 kV today only by micro tunneling, with a special cable channel

• New 400 kV are tested, Minimum distance 25 m, no experiences for

HDD (heavy cables)

Challanges for power cables


Stress-strain analysis:

)0(MMtH EAN

)0(Ru

)0(MMt

GF

EAl

2

l

EA

Fw

2G

)0(Ru

max

•Normal force:

•Length of gliding section:

•Maximum displacement:

z,w

x,u

+

0 friction forces

adhering section gliding section

(pressure)

District heatingpipeline

Axial displacement w

Normal force N

Trenchless District Heating Pipeline


Trenchless District Heating Pipeline

Quality contol of delivered pipes and the

constructed joints.


Results – point of view FFI:

Horizontal Directional Drilling is the most economic

method in many cases, because no excavation is

needed. But risk of soil, blow ups and curvature

have to be taken into account.

The complete filling of the gap between pipe and

surrounding soil is not granted. Thus the contact

area is not constant among the pipe length. The

approach for the friction forces should be carefully

done.

Eurocode 7 should be respected in terms of field

investigation.

The thickness of the coating should be increased.

Trenchless Installation for District Heating pipes

Source: AGFW, Eichhorst


Examples next research possibilities:

Development of a coupling joints for the trenchless district heating

construction.

Optimisation of bentonit suspension.

Load bearing characteristics of the district heating pipe by using of the

protective pipe.

Interaction PE Pipe – ring space?

Interaction Protective pipe – ring space?

Interaction Protective pipe – soil?

Trenchless Installation for District Heating pipes


Thank you for your attention!

Dr.-Ing. Ingo Weidlich

Tel. +49 511 943 70 - 25

[email protected]

challanges in smart energy transport by using trenchless technology · 2019-04-22 · folie 1 von...

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