![]() With extensive experience in operating various types and sizes of ABI equipment, Condon-Johnson has developed state-of-the-art techniques in the construction of specialty foundations. Because these sensitive materials can’t be forced into place, Condon-Johnson installation methods provide a high level of care and quality. While steel interlocks can be strong enough to hold together when driven slightly out of alignment, plastic and fiberglass interlocks simply break. The ability to maintain precise verticality and alignment is especially important in the installation of vinyl and composite sheet piling. The result is faster and higher quality sheet piling installation, with reduced construction costs. Mobilization is also much more efficient, as the ABI is transported on a single truck and set up in a matter of hours. With the ABI mobilram, sheet pile driving occurs in a single stroke, without the use of a template and requires a smaller crew than conventional methods. Positive and precise control of the piles during installation is now possible with powerful hydraulics capable of articulation in all directions. Vibratory hammers, impact hammers, presses, drills or other attachments are mounted to the mast depending on job requirements. The ABI runs on a track-mounted carrier with an extendable vertical mast. Condon-Johnson owns and operates ABI mobilram equipment, which was designed specifically for the installation of sheet piling. These conventional methods are slow and inefficient, and the costs of mobilization and operation often make sheet pile walls an expensive option.Ĭondon-Johnson’s innovative installation methods and equipment now make sheet piling a more viable option. Historically, the piles were then driven down in incremental stages in order to maintain alignment and minimize interlock binding. The sheets would typically be laced with the crane and held vertical in a large steel template that is designed and fabricated for each job. Sheet pile materials can be steel, vinyl or composite, depending on the application. If installed properly, sheet piles use a mechanical interlock that creates a continuous water-tight seal. Sheet piling provides a permanent or temporary shoring or cut-off wall. Where the bottom of excavation is below the ground water table, secant walls systems can be combined with jet grouting at the base of excavation to form a “bottom plug” so that both the bottom and the sides of the excavation remain watertight.Ĭompared to sheet pile walls, secant pile walls offer increased stiffness, decreased noise during installation, and are installed with minimal vibrations making them ideal for sensitive areas where settlement and noise are an issue. Guide walls are typically constructed prior to installing the secants to help provide location control for the secant piles. In order to achieve the required structural overlap and water-tight configuration, secant pile walls must be installed with tight tolerances. Typically the initial pile set is constructed of a “soft” or unreinforced material, and the secondary pile set is constructed using hard concrete with either rebar or steel beam reinforcement. The piles are installed in an alternating primary/secondary fashion along the alignment of the wall. Secant pile wall systems are constructed using overlapping piles to create a continuous, water-tight structural wall. With innovative construction methods and modern drilling equipment, we are able to install secant pile walls in the most challenging urban environments with minimal impact to adjacent structures, utilities, and roadways. Condon-Johnson is recognized as a leader in the industry, applying decades of experience, innovation and technology to successfully complete hundreds of earth retention projects.Ĭondon-Johnson is experienced in building hard/soft, hard/firm, and hard/hard secant pile walls over 150 feet deep. Our geotechnical professionals continue to be at the forefront of innovation, developing and applying progressive design and construction techniques. Condon-Johnson’s legacy in earth retention started in 1976 when the company built the first soil nail wall in North America. ![]() Whether Condon-Johnson is stabilizing a landslide, underpinning an existing structure or supporting the sides of an excavation, the company has the engineers, experience, and equipment to provide the most cost effective solution to your challenging project. Earth Retention, also known as Shoring, is used to support something that is otherwise unstable.
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