Design and Construction of Steel Pipe Trestle Bridges in Aquatic Environments

Literature Overview and Engineering Context

This paper by Luo Tianyang and colleagues, published in 2016 in the journal "Steel Structures" (钢结构, Vol. 31, No. 8, pp. 71-74), addresses a practical engineering challenge encountered during the Chuzhou Dashan Wind Farm to Guhe 110 kV transmission line project. The authors propose a steel pipe trestle bridge structure designed to span water bodies during the construction phase of the transmission line corridor. The study systematically investigates the determination of design standards, load calculation methods, finite element mechanical performance analysis, applicable scope, and construction techniques for this novel structural system. The successful implementation of the proposed scheme in the actual project validates the feasibility of the approach.

Core Technical Content and Design Methodology

The primary challenge in designing trestle bridges for aquatic environments lies in the selection of appropriate design codes and the accurate calculation of loads, which differ substantially from conventional bridge engineering due to the temporary nature of these structures and the complex hydrodynamic environment. The authors adopted a finite element method (FEM) to analyze the mechanical performance of the steel pipe trestle bridge, which allows for precise prediction of stress distribution, deflection, and stability under various load combinations including dead load, live load, wind load, and wave load.

The structural system utilizes steel pipes as the primary load-bearing elements, which offer advantages in terms of material efficiency, rapid erection, and adaptability to irregular terrain. The design process involves determining the structural span, support conditions, and connection details between pipe segments. The finite element model captures the nonlinear behavior of the connections and the geometric imperfections inherent in field-erected pipe structures.

Construction Technique and Practical Considerations

The construction process for steel pipe trestle bridges in water requires careful planning of foundation installation, pipe segment delivery, and on-site assembly. The authors describe a construction methodology that accounts for the logistical constraints of working in aquatic environments, including the use of floating platforms or barge-mounted equipment for pipe handling. The connection details between pipe segments are critical to the overall structural integrity and must be designed to withstand both static and dynamic loads imposed by the transmission line construction activities.

The applicability of this structural system is discussed in terms of span length, water depth, and environmental conditions. The paper provides valuable guidance for engineers encountering similar challenges in renewable energy infrastructure projects where temporary access bridges are required over water bodies. The integration of design analysis with construction methodology represents a holistic approach that bridges the gap between theoretical modeling and field execution.

Key Insights and Engineering Implications

The study demonstrates that steel pipe structures are viable alternatives to conventional timber or steel truss trestles for temporary aquatic crossings, particularly when rapid deployment and cost efficiency are prioritized. The finite element analysis methodology presented can be adapted for similar projects by modifying boundary conditions and load parameters. Engineers should note that the design standards referenced may differ from those applicable in other jurisdictions, and local code requirements must be verified before implementation. The successful field application confirms that the proposed design methodology produces structures with adequate safety margins under expected service conditions.