Table 1 Construction conditions and amounts of material and energy used and substituted

Construction conditions

 Support post spacing

m

4.000

4.000

2.000

2.000

4.000

3.000

 Beam material

Japanese cedar wood (split halves)

Japanese larch wood

Steel

Steel

 Beam diameter

m

0.180

0.180

0.180

0.180

–

0.049

Materials and fuels used in the raw material procurement and production process (per 1 m)

 Support post

  Carbon steel post

kg

6.760

6.760

–

–

6.719

9.295

  Concrete

kg

–

–

59.271

59.271

–

–

  Steel bar

kg

–

–

7.695

7.695

–

–

  Resin powdered paint

kg

0.049

0.049

–

–

0.049

0.069

  Zinc galvanizing

kg

0.109

0.109

–

–

0.108

0.151

 Connector

  Bolt (steel)

kg

1.334

1.334

1.367

1.367

0.322

0.739

  Inner sleeve (steel)

kg

0.414

0.414

–

–

–

1.028

  Bracket (steel)

kg

0.640

0.640

–

–

0.239

0.430

  Connection plate (steel)

kg

–

–

0.656

0.656

–

–

  Resin powdered paint

kg

0.008

0.008

–

–

0.004

0.128

 Steel beam

  Steel beam

kg

13.245^a

13.245^a

–

–

8.273

8.409

  Resin powdered paint

kg

0.221

0.221

–

–

0.190

0.115

 Wooden beam

  Wooden beam

m³

0.025

0.025

0.053

0.053

–

–

  Electric power for wooden beam production from logs

kWh

0.462

0.462

0.962

0.962

–

–

  Electric power for pressure injection into wooden beams

kWh

–

0.843

–

1.755

–

–

 Preservative (ACQ)

kg

–

0.607

–

0.474

–

–

 Water-based synthetic resin paint

kg

0.093

–

–

–

–

–

 Oil-based paint

kg

–

–

0.122

–

–

–

Fuels used in the construction process (per 1 m)

 Light oil

L

0.202

0.202

0.960

0.960

0.202

0.271

Fuels used in the disposal process (per 1 m)

 Light oil for chip processing

L

0.038

0.038

0.079

0.079

–

–

Materials and fuels substituted in the disposal process (per 1 m)

 Steel products^b

kg

22.394

22.394

9.719

9.719

15.553

19.901

 Aggregate^b

kg

–

–

59.271

59.271

–

–

 Heavy oil^c

L

3.624

3.624

9.707

9.707

–

–