9.48 a

9.48b

Figure 9.48

   Downward drag

 Test loadings

 Case number

 1

 2

 3

 4

 5

 6

 7

 Soil type

 Fill, sand, and clay

 Fill and silty clay

 Fill and clay

 Sand and silty clay

 Silty clay

 Silty clay

 Sand fill, clay, and peat

 Pile type

  

Pile cross section (mm)

 Cast-in- place concrete

� = 530

 Steel pipe

 

� =

300

 Steel pipe

 

�

= 500

 Steel pile

 

�

= 760

 6 RC piles

 

300× 300

 6 RC piles

 

300× 300

 Precast concrete380

× 450

 Length in contact with settling soil (m)

 25

 26

 40

 25

 7-17

 9-16

 24

 Installation method

 Predriven casing

 Enlarged tip and slurry

 Enlarge tip and casing

 Driving

 Driving

 Driving

 Driving

 Bitumen

    

20/30

    

80/100

    

80/10

    

60/70

    

60/70

    

80-100

    

43

coatingType (pen25° �)

            RC-0 specialCoating           cutback gradethickness(mm)

10 1.2 1.2 1.5 1.2 1.2 10