Pile Driving

The pile driving technique is powered by pneumatic or diesel pile drivers of which the dynamic weight is driven by hydraulics. By pulsating load on top of the sheet pile, the critical frequency is being passed and the sheet pile is driven into the soil. This technique is mainly used for the driving of piles and solid caissons, especially in cohesive soils and fine-grained soils including silts and clays. What pile driver to use, is depending on the soil conditon, working depth and strength of the sheet pile wall. For plastic and composed sheet pile walls, there are special pile drivers on the market with less impact pressure in order not to damage the elements. Pile driving can also be done by a conventional drop hammer, with or without steel framework.

(This article comes from PVE Piling & Vibro Equipment editor released)

Different Sheet Piling driving hammers

Methods for steel sheet pile construction are classified as follows.

1. Vibration method using vibrating pile hammer;
2. Pile jacking method using pile jacking machine;
3. Pile jacking method using spiral drill;
4. Piling method using pile hammer
For hard foundation, water jetting method could be used with.

1. Vibration method using vibrating pile hammer

This is a construction technique that drives steel sheet pile into earth by transferring the vertical vibration generated by vibrating pile hammer. In default of hitting power, the head of steel sheet pile would not be damaged, which contributes to a relatively high construction efficiency; this technique is applicable for both driving and extraction of pile. However, the instantaneous current is extremely high in case of electric vibration, so large-scale electrical equipment is required; in case of hydraulic vibration, dedicated hydraulic unit is a must under most circumstances.

Recently, machines that are suitable for low-noise and low-vibration construction method and for construction under beam or in small space have been put in operational service.

2. Pile jacking method using pile jacking machine

This is a construction technique that presses steel sheet pile into earth using the counter-force of drive-in steel sheet pile by clamping the intermediate section of steel sheet pile.

The main body of machine is very compact and applicable for construction under beam, but steel sheet piles need to be lifted with additional cranes.

This technique is suitable for soft foundation and can realize low-noise and low-vibration construction.

3. Pile jacking method using spiral drill

With respect to this construction method, steel sheet pile is pressed in using hydraulic press during or after drilling; in this construction technique, both the drilling mechanism of spiral drill and the penetration mechanism of steel sheet pile is provided. Thanks to the use of sleeve, a high rigidity is realized during penetration, so this technique is suitable for hard foundation. Furthermore, this construction method can realize low-noise and low-vibration construction.

4. Piling method using pile hammer

This construction method features large hitting power, mobility, high hitting frequency and operational abundance; however, feasible pile hammer must be selected so as to prevent compression failure of pile head during hitting.

Since this construction technique makes high noise and vibration, its use in surrounding areas of residential district, school and hospital etc. and designated areas is restricted; hence, it is rarely used in harbor district.

Pile hammer is classified into diesel engine driven pile hammer, hydraulic pile hammer, monkey and pneumatic pile hammer etc.