Construction Methods of Steel Pile Sheet Piles.PDF

Construction Methods of Steel Pipe Sheet Piles

(1) Setting up SPSP guide rails

(2) Driving SPSP by vibrohammer

(3) Extension by welding segment joint

(4) Driving SPSP by hydraulic hammer

(5) Installation of SPSP is complete

(6) Condition of P-P after installation

Photo 2-1 Standard construction flow of SPSP foundation (Excavation in water
and waterproof method) (No.1)


(7) Cleaning (removing soil) joint pipes

(8) Mortar is injected into the joints

(9) Injecting waterproof chemical agents

(10) Joints treatment is complete

(11) Pouring concrete into the main piles

(12) Checking concrete level in the pile

Photo 2-1 Standard construction flow of SPSP foundation (Excavation in water

and waterproof method) (No.2)


Construction Methods of Steel Pipe Sheet Piles

(13) Filling concrete into outer perimeter

(14) Inside excavating and concreting

(15) Erecting wall supports

(16) The inside of foundation is dried up

(17) Welding SPSP-footing connectors

(18) Reinforcement works for footing

Photo 2-1 Standard construction flow of SPSP foundation (Excavation in water
and waterproof method) (No.3)


(19) Constructing the pier

(20) Underwater cutting of SPSP

Photo 2-1 Standard construction flow of SPSP foundation (Excavation in water
and waterproof method) (No.4)

2.5

Specific Developments in Steel Pipe Sheet Piles

Conventional research and developments in SPSP have been done towards improving the strength
of the joint; static lateral load experiments have been conducted for the purpose of developing
analytical methods for design of SPSP considering basic deformation characteristics, Morikawa et al.,
(1995), Kobayashi et al., (1997). Attempts have also been made to improve the lateral bearing
capacity, Morikawa et al., (1995), by enlarging the diameters of the steel piles and carrying out lateral
load experiments.

2.5.1 Experimental Lateral Loading and Static Behavior of SPSP
In order to grasp the complicated horizontal behavior of SPSP foundations, many horizontal
loading experiments have been done. From full-scale tests, the coefficient of horizontal sub-grade
reaction, joint efficiency, stress and deformation characteristics have been studied, Tottori et al.
(1980). Tottori et al. studied the lateral earth-pressure around a SPSP foundation and concluded that
the front side takes up 100% stress and 60% at 45° while no stress is felt on the sides. Hisamitu and
Shirakawa (1970), studied the behavior the mechanical behavior of SPSP whose joints are filled with
mortar and compared with those without mortar filling, they concluded that the mortar filled joints
are several times stronger than the ones without mortar filling. However, despite the strength
increase in the mortar filled joint, there still exist significant shear movements at those joints. These
movements are responsible for reduced strength of such joints. For this reason, studies have been