2DM Associates, Inc. - Engineering Services


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Engineering Services
Following are brief descriptions of the professional engineering and technical services provided by 2DM Associates over its more than 30 years of professional activity.

	Lift Planning and Engineering - Mobile Cranes 2DM Associates was engaged in the planning, design, and analysis of special lifts using mobile cranes, including cranes with heavy lift attachments (Ringers®, guy derricks, and the like). Details addressed included equipment arrangements, calculation of wind loads, evaluation of crane ground loads and supports, design of below-the-hook lifting devices and lifting attachments, and development of operation procedures, crane layout and rigging drawings and documentation. This work included conventional lifting, multi-crane lifts, and barge-mounted cranes in a wide variety of construction and industrial conditions. David Duerr, P.E.(ret.) also performed third-party reviews of lift plans, engineering, and operations procedures to verify compliance with safety requirements and owner specifications.

	Lift Planning and Engineering - Alternative Lifting Methods Planning and engineering of special and critical lifts using alternative lifting methods, conceptual development, engineering, and detail design of specialized heavy lifting and rigging equipment. Projects included equipment design and lift planning using derricks, bridge cranes, telescopic hydraulic gantry systems, tower lifting systems using strand jacks, and design of lifting gear integrated into the existing facility structure.

	Marine Transportation Engineering Complete marine transportation studies of cargo-laden barges (hydrostatic analysis; motion forces; ballast plans). These services covered development of cargo stowage plans, tie-down design, and barge structure analysis. Roll-on/Roll-off operation planning, analysis, and review. Engineering of barge-mounted crane arrangements and operations.

	Services Directed to Facility Owners Consultation to facility owners and general contractors with respect to the contracting of specialized lifting, rigging, and transportation services.

	Accident Investigation and Expert Testimony Investigation of accidents and failures involving cranes, rigging, specialized lifting equipment, and transportation. Special expertise in hydraulic gantry systems and below-the-hook lifting devices. Analysis of structural and mechanical capacities of lifting equipment. Review of lifting and rigging field operations. Expert witness services for litigation support for contractors, insurance companies, and attorneys.

	Lectures and Training David Duerr, P.E. (ret.) conducts lectures for industry and academe on a range of subjects in the areas of lifting, rigging, and barge transportation of heavy-lift cargo. As these activities are not considered to be the offering of professional services, Mr. Duerr remains available for training sessions and speaking engagements.
Copyright © 2DM Associates, Inc. 2019. All rights reserved. As of October 1, 2019, 2DM Associates, Inc. is no longer providing professional engineering services.