Bridge launching

Rosignoli, Marco

doi:10.1680/bl.59979.017

Cited by 7 publications

(10 citation statements)

References 43 publications

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“…The most common systems used for launching bridges are launching jacks and tow systems using bars or cables. [8]- [11]. Both of these systems work with hydraulic jacks which provide important advantages for displacement of heavy structures.…”

Section: New Mechanism For Displacement Of Structuresmentioning

confidence: 99%

New mechanism for continuous and bidirectional displacement of heavy structures: Design and analysis

Alonso-Martínez

Díaz

Castro‐Fresno

et al. 2014

Automation in Construction

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The aim of this paper is to design and study a new mechanism for moving heavy structures using the force of friction. The mechanism designed is called DCACLM and was patented in 2011. This new device is based on an inverted crawler which is able to displace heavy structures such as large span bridges in a continuous and bidirectional way. Furthermore, the DCACLM design has taken into account other important aspects such as safety and sustainability in order to develop new construction methods. Nonlinear numerical models using the Finite Element Method have been developed to study the complex structural behavior of this new mechanism. The main conclusions provide acceptable results in terms of stresses and strains for the main elements of DCACLM.

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Section: New Mechanism For Displacement Of Structuresmentioning

confidence: 99%

New mechanism for continuous and bidirectional displacement of heavy structures: Design and analysis

Alonso-Martínez

Díaz

Castro‐Fresno

et al. 2014

Automation in Construction

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“…The design variables, characteristics of the problem that can be varied during the optimization process, are the dimensions of cross-section of the concrete deck, the size of the launching nose, and the value of centric prestressing forces in the front and back part of the girder, namely: The limits of validity and a starting value of each design variable can be established using technical criteria and experience from similar previous works [1][2][3].…”

Section: Formulation Of the Optimization Problemmentioning

confidence: 99%

“…The Incrementally Launching Method (ILM) is a common construction procedure for medium span prestressed concrete bridges that consist of building a deck by segments on the ground and advancing the already-built deck portion periodically over the piers until reaching its final position in a similar way to an extrusion [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Software with a graphical interface for design optimization of prestressed concrete launched bridges

Fontán¹,

Hernández²,

Tsao³

2012

WIT Transactions on the Built Environment

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A computer code aimed to produce optimum design of prestressed concrete launched bridges during construction phase is presented in this paper. The software provides the least cost design for a prestressed concrete bridge constructed by incrementally launching procedures, searching simultaneously for the optimum cross-section dimensions and the prestressing forces of the concrete deck, as well as the most adequate characteristics of the launching nose. The code incorporates the complete set of constraints considered in the Spanish code of practice for this type of structure. The software features an advanced graphical interface to provide a user friendly communication. This graphical environment allows managing multiple projects simultaneously. The benefit of considering the numerical optimization instead of design rules, established by well known bridge designers that can be found in the literature, has been demonstrated by authors in previous publications. In this paper an application example is presented to make clear the capabilities of the code.

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“…The bridge launching technique is defined as a construction system in which the whole deck structure is divided into segments and not directly placed into its definitive position but a nearby location, usually behind one of the abutments (see Fig. 1) [1,2,3].…”

Section: Introduction and Historical Reviewmentioning

confidence: 99%

New launching method for steel bridges based on a self-supporting deck system: FEM and DOE analyses

Navarro-Manso

Díaz

Alonso-Martínez

et al. 2014

Automation in Construction

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This paper studies a new launching method for steel bridges based on a self-supporting deck system. This new and patent-protected procedure is able to launch bridges of a span length up to 150 m, in an economical and sustainable way. The use of the last span segments to reinforce the critical sections during launching replaces other conventional temporary means applied nowadays. The main objective of this research paper is to numerically analyse the best double deck configuration as well as to define an approach to stiffener distribution in order to avoid the patch loading phenomenon in the slender webs. With this in mind, the pre-design of a triangular cell along the low flange of each web is presented. A three dimensional finite element model (FEM) is built and the design of experiments technique (DOE) is applied to obtain the best bridge configuration. This new construction method can be used together with a continuous launching system in order to increase the velocity of the whole operation and to improve safety during launching. Very good results have been obtained, in terms of deflection, patch loading resistance and vertical load on the pushing device. The comparison with other different construction systems and the application to a real case allows us to ensure the viability of the method described.

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Bridge launching

Cited by 7 publications

References 43 publications

New mechanism for continuous and bidirectional displacement of heavy structures: Design and analysis

New mechanism for continuous and bidirectional displacement of heavy structures: Design and analysis

Software with a graphical interface for design optimization of prestressed concrete launched bridges

New launching method for steel bridges based on a self-supporting deck system: FEM and DOE analyses

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