12.1.4 Conclusions
(1) By comparing several typical foreign hydraulic hammers, it can be seen that
CGL370 type of British BSP and Dutch IHC S-type have higher strike frequency, while HHKA type of JUNTTAN hydraulic hammer in Finland has
lower strike frequency.
(2) The Dutch IHC S-type and HHKA type of JUNTTAN in Finland both have
high impact energy and can be adjusted in a wide range. The CGL370 series of
British BSP are single acting hydraulic pile hammers with low impact energy
and limited adjustable range.
(3) The hydraulic system of Dutch IHC S-type hydraulic hammer is simple and
compact. The hydraulic system of other companies is relatively complex. The
cylinder of IHC hydraulic hammer is equipped with nitrogen chamber to adjust
the pressure so as to adjust the strike energy. The maximum strike acceleration
can reach 2 g, which is suitable for large tonnage pile driving.
12.2 High-Speed Pneumatic–Hydraulic Composite
Hammer
Pile foundations are widely used in high-rise buildings, bridges, ports, offshore oil
production platforms and nuclear power plants. Pile foundations have become the
most important form of foundation in China’s engineering construction. In the past,
diesel pile hammer was widely used, but because of its shortcomings such as high
noise, high pollution, and low efficiency, it has been unable to meet the actual needs
of the environment and energy. Now, hydraulic pile hammer and pneumatic–hydraulic composite pile hammer have been gradually adopted.
This section analyzes the hydraulic circuit of the pneumatic–hydraulic pile
hammer, establishes the dynamic equation of the rising and falling process, analyzes the influence of the main parameters on the working performance of the
hydraulic hammer, determines the parameters that meet the design conditions, and
the calculation results will play a guiding role in the design and development of the
hydraulic hammer.
12.1 Pneumatic–Hydraulic Composite Pile Driving Hammer
277
(1) By comparing several typical foreign hydraulic hammers, it can be seen that
CGL370 type of British BSP and Dutch IHC S-type have higher strike frequency, while HHKA type of JUNTTAN hydraulic hammer in Finland has
lower strike frequency.
(2) The Dutch IHC S-type and HHKA type of JUNTTAN in Finland both have
high impact energy and can be adjusted in a wide range. The CGL370 series of
British BSP are single acting hydraulic pile hammers with low impact energy
and limited adjustable range.
(3) The hydraulic system of Dutch IHC S-type hydraulic hammer is simple and
compact. The hydraulic system of other companies is relatively complex. The
cylinder of IHC hydraulic hammer is equipped with nitrogen chamber to adjust
the pressure so as to adjust the strike energy. The maximum strike acceleration
can reach 2 g, which is suitable for large tonnage pile driving.
12.2 High-Speed Pneumatic–Hydraulic Composite
Hammer
Pile foundations are widely used in high-rise buildings, bridges, ports, offshore oil
production platforms and nuclear power plants. Pile foundations have become the
most important form of foundation in China’s engineering construction. In the past,
diesel pile hammer was widely used, but because of its shortcomings such as high
noise, high pollution, and low efficiency, it has been unable to meet the actual needs
of the environment and energy. Now, hydraulic pile hammer and pneumatic–hydraulic composite pile hammer have been gradually adopted.
This section analyzes the hydraulic circuit of the pneumatic–hydraulic pile
hammer, establishes the dynamic equation of the rising and falling process, analyzes the influence of the main parameters on the working performance of the
hydraulic hammer, determines the parameters that meet the design conditions, and
the calculation results will play a guiding role in the design and development of the
hydraulic hammer.
12.1 Pneumatic–Hydraulic Composite Pile Driving Hammer
277