A piling machine, a term encompassing equipment like piledrivers, piling rigs, pile boring machines, drill rigs, and rotary drills, is a cornerstone in construction for building strong foundations. While these terms are often used interchangeably, they refer to different machine configurations and applications. Understanding these distinctions is crucial for choosing the right equipment for specific construction tasks.
The core of a piling machine lies in its base structure, typically a crane or an excavator, modified for specific foundation-building purposes. Manufacturers like Liebherr and Sennebogen, often referring to these as 'baggers', have developed specialized rigs tailored for these applications. For example, in an excavator setup, the standard boom is replaced with a shorter, more horizontally-aligned piece to support a vertical leader mast, whereas, in a crane configuration, the mast is mounted at the peak of the lattice boom. These adaptations highlight the versatility and engineering ingenuity behind these machines.
Watch our recent YouTube video showcasing how a couple of KOBELCO excavators can work as piling machines:
However, the defining feature of a piling machine is its specialty attachment, which holds and drives the pile into the ground. This article delves into the various types of these specialty attachments, their applications, and the distinct features of different piling machines. Read on for a comprehensive understanding of these vital construction tools.
Throughout history, the evolution of piling machines has seen various types emerge, each adapted to specific construction needs. Today, the most commonly used types include diesel hammers, vertical travel lead systems, hydraulic hammers, hydraulic press-ins, and vibratory pile drivers/extractors.
Modern diesel pile hammers operate as large two-stroke diesel engines. The key component, the piston, acts as the weight, and the cylinder attaches to the top of the pile. The process starts by lifting the weight, drawing air into the cylinder, where diesel fuel is injected. The falling weight compresses the mixture, causing ignition and transferring energy to the pile head. This cycle repeats, driving the pile deeper with each stroke.
These systems come in two primary forms: spud and box leads. Box leads are prevalent in the Southern United States, while spud leads are more common in the Northern United States, Canada, and Europe. The choice between these two depends on regional preferences and specific construction requirements.
As a contemporary alternative to diesel and air hammers, hydraulic hammers are used for driving steel pipe, precast concrete, and timber piles. They are environmentally friendlier, producing less noise and pollution. Despite their quieter operation, the impact noise levels can be similar to diesel hammers, as the dominant sound often comes from the hammer striking the pile.
These machines use hydraulic rams to press piles into the ground, an ideal choice in situations where vibration is a concern. Press attachments can adapt to conventional rigs for simultaneous pressing of sheet piles, and other press equipment can be mounted on existing piles for greater force application. This method is particularly effective for precise pile installation.
Equipped with a system of counter-rotating eccentric weights and powered by hydraulic motors, these machines focus on delivering vertical vibrations to the pile. Ideal for driving or extracting piles, they are often used in noise-sensitive areas or where vertical clearance is limited. Vibratory pile drivers can be attached to an excavator or crane and vary in vibration rates to accommodate different soil conditions and project requirements.
The first three types of piling machines have been widely outdated, with civil engineers opting for hydraulic and vibratory piling machines to accommodate environmental requirements.
A piling machine, particularly a piling rig, is indispensable in modern construction due to its crucial role in creating deep foundations. A piling rig, akin to a large track-mounted drill, is essential for foundation projects that involve drilling into varied ground types like sandy soil, clay, silty clay, and others. These rigs are functionally similar to oil drilling rigs and can be outfitted with diverse tools like a short screw for dry soil, a rotary bucket for wet soil, or a core drill for rock formations.
The necessity of piling machines stems from the need for deep foundations in certain construction scenarios. A deep foundation, as opposed to a shallow one, transfers the loads of a building deeper into the earth, reaching a subsurface layer or a range of depths. This is particularly vital for structures such as skyscrapers, where the loads are immense and the surface soil may not provide adequate support.
Geotechnical engineers often recommend deep foundations for several reasons, such as handling very large design loads, coping with poor soil conditions at shallow depths, or navigating site constraints like property lines. Deep foundations come in various forms, including piles (analogous to poles), piers (similar to columns), drilled shafts, and caissons. Each serves a specific purpose and is chosen based on the requirements of the building and the site conditions.
Piles, a key element in deep foundations, are typically driven into the ground in situ. They may be made from materials like timber, steel, reinforced concrete, or prestressed concrete. In projects requiring deep foundations, such as expressways, bridges, industrial and civil buildings, water conservancy projects, slope protection, and seismic retrofitting, piling machines play a critical role. The use of pile foundation systems, often involving groups of piles connected by a pile cap, helps distribute loads that exceed the bearing capacity of a single pile.
Pile caps and isolated piles are usually interlinked with grade beams, creating a cohesive foundation system. This arrangement allows for the distribution of structural loads, with lighter elements bearing on the grade beams and heavier elements directly on the pile cap.
A piling machine is integral to the construction of deep foundations, offering the necessary support and stability for a wide range of structures.
Among the diverse range of piling machines, the ABI Mobilram TM17 piledriver stands out for its versatility and efficiency. This machine is particularly adept in various civil engineering and foundation works, including drilling, pile driving, static pressing, soil mixing, and impacting. The TM piling system, which stands for telescopic mast, is designed for high efficiency and precision in a multitude of construction scenarios.
The basic components of the telescopic leader mast piling rig are:
Carries the vibratory head, crucial for pile driving.
Positions the pile and acts as a guide for the vertical movement of the vibratory head.
Ensures the attachment, such as the vibratory head, is correctly positioned.
Attached to the boom, these parts control the movement of the leader mast, allowing for precise operation.
Aside from these specialized components, the ABI Mobilram TM17 shares common features with an excavator, including the upper carriage, counterweight, engine, undercarriage, and cabin. This model is mounted on the Sennebogen SR35 carrier (base machine), which boasts a CAT C18 diesel engine compliant with EU Tier 5 emissions standards, reflecting its commitment to environmental sustainability.
Here are some of the key specifications of the ABI Mobilram TM17 piling rig:
Stroke Guiding Carriage
Max Torque Absorption
Max Load Capacity
The ABI Mobilram TM17 piledriver, with these specifications, is a testament to modern engineering in piling machinery, offering robust performance, versatility, and environmental consciousness.
Understanding the various types, applications, and key features and specs of a piling machine, such as the ABI Mobilram TM17 piledriver, helps understand the specialized requirements of modern construction. These machines play an indispensable role in laying strong, stable foundations for a myriad of structures, from skyscrapers to bridges. With advancements in technology, piling machines have become more efficient, versatile, and environmentally friendly, to meet varying site requirements and local regulations. To compare different models and technologies across various OEMs, you can explore our listings of piling machines for sale.