Pile Driver Types

Pile driver machine consists of a pile hammer, a pile frame and ancillary equipment. The basic technical parameters of pile drivers are the weight of the impact part, impact kinetic energy and impact frequency. Pile hammers can be divided into drop hammers, steam hammers, diesel hammers, hydraulic hammers, etc. according to the power source of the movement.

Hydraulic Hammer Pile Driver

It is a new type of pile driver that is diesel-driven and uses oil pressure as its power. The hydraulic pressure can be adjusted according to the different soil types to achieve the appropriate impact force for piling. Small and medium-sized hydraulic pile drivers are often used for piling highway guardrails, highway guardrail construction and solar plant construction. Similar piling equipment includes: hydraulic pile drivers, highway pile drivers, guardrail pile drivers, and highway drilling machines. Compared with diesel pile drivers, the energy transfer efficiency of hydraulic hammer pile drivers can reach 70%~95%, while the energy transfer efficiency of diesel hammer pile drivers is only 20%~30%. Hydraulic hammer pile drivers have precise piling control and can achieve piling operations in different strata; hydraulic hammer pile drivers have excellent performance in reducing noise, vibration and noise, and are particularly suitable for urban construction needs. Hydraulic hammer pile drivers have obvious energy-saving and emission-reduction effects and are the mainstream of future pile driver development.

Diesel Hammer Pile Driver

The main body is also composed of a cylinder and a plunger. Its working principle is similar to that of a single-cylinder two-stroke diesel engine. The atomized diesel injected into the combustion chamber of the cylinder is subjected to high pressure and high temperature and then exploded to drive the hammer head to work. Diesel hammers are divided into guide rod type and cylinder type according to their structural form. The guide rod type diesel hammer uses the plunger as the hammer seat to press on the pile cap, and the cylinder as the hammer head to rise and fall along the two guide rods. When piling, first lift the pile to the gantry of the pile frame, then place the diesel hammer on the top of the pile, lower the hook to lift the cylinder, and then release the hook to let the cylinder fall into the plunger, compressing the air enclosed in the cylinder. The cylinder continues to fall until the pressure pin outside the cylinder body pushes the rocker of the fuel pump on the hammer seat. The fuel pump sprays oil mist into the cylinder. The oil mist encounters high-temperature gas above the ignition point, and immediately explodes. The explosive force impacts downward to make the pile sink, and pushes upward to make the cylinder rise. When the cylinder falls along the guide rod again, the second impact cycle begins again. The barrel-type diesel hammer uses the cylinder as the hammer seat and is directly guided by the extended inner wall of the cylinder, eliminating two guide rods. The plunger is the hammer head and can move up and down in the cylinder. When piling, press the pile cap at the bottom of the hammer seat onto the top of the pile, lift the plunger with a hook, and then unhook it and impact it downward to compress the air enclosed in the cylinder. And carry out the working processes such as fuel injection, explosion, impact, and ventilation. The work of the diesel hammer is started by compression ignition of diesel, so it is necessary to ensure that the enclosed gas in the cylinder reaches a certain compression ratio. Sometimes when piling on soft soil, it is often impossible to ignite and detonate due to insufficient reaction force and insufficient compression. It is necessary to use a hook to lift the hammer head several times, unhook and impact it before starting. The hammer seat of the diesel hammer is equipped with a fuel injection pump, fuel tank, cooling water tank and pile cap. The movable gap between the plunger and the cylinder is sealed with an elastic plunger ring

Steam Hammer Pile Driver

The pile hammer consists of a hammer head and a hammer seat, and is powered by steam or compressed air. There are two types: single-acting steam hammer and double-acting steam hammer. The single-acting steam hammer uses a plunger or a cylinder as the hammer head. Steam drives the hammer head to rise, and then it is allowed to fall along the guide rod of the hammer seat to drive the pile. The double-acting steam hammer generally uses a weighted plunger as the hammer head and a cylinder as the hammer seat. The steam drives the hammer head to rise, and then drives the hammer head downward to impact and drive the pile. The up and down reciprocating speed is fast and the frequency is high, which makes the pile vibrate when it penetrates the formation, which can reduce friction resistance and achieve good pile driving effect. The differential steam hammer with two-way unequal force has a light hammer seat, and the effective impact weight can be relatively increased, and the performance is better. The reversing of the steam inlet and exhaust valve of the steam hammer can be controlled manually, or it can be automatically controlled by a flange control lever installed on one side of the hammer head and rising and falling with the hammer head. Both methods can adjust the impact stroke of the steam hammer.

Drop hammer pile driver

The pile hammer is a heavy steel block that is lifted by a winch with a hook. After being unhooked, it falls freely along the guide frame to drive the pile.

Spiral pile driver

Spiral hammers are a type of pile driving equipment that uses a power head to drive a drill bit into the ground to drill a hole. Spiral hammers can be divided into two parts: the pile frame and the drilling part.