ANALYSIS AND DESIGN OF OVERHEAD MOVABLE SCAFFOLDING SYSTEMFOR NEW PHRA NANGKLAO BRIDGE OVER CHAO PHRAYA RIVER
Mr. Watanapong Hiranmarn1Col. Dr. Chuan Chuntavan2Mr. Martin P. Bae3Mr. Yotsing Jeerasup41Lecturer, Civil Engineering Department, Mahanakorn University of Technology, E-mail: watanapong@gmail.com2Assistant Professor, Civil Engineering Department, Academic Division,Chulachomklao Royal Military Academy, E-mail: chuan@nrsc.co.th3Managing Director, NRS Consulting Co.,Ltd., E-mail: nrsthai@truemail.co.th4Design Engineer, NRS Consulting Co., Ltd., E-mail: yotsing.nrsc@gmail.com
ABSTRACT: Bridge construction equipment specialist, NRS Consulting Co., Ltd. (NRSC), has been appointed by Unique Engineering and Construction Public Company Limited to undertake the design of the bridge constructionsystem for New Phra Nangklao bridge over Chao Phraya River. Overhead Movable Scaffolding System (OH-MSS) hasbeen defined as a construction system for part of viaducts. Originally, this MSS has been used for the Industrial RingRoad Project and designed by Engineering firm in England. The MSS was bought to be used for the New PhraNangklao bridge. Main Trusses, Transverse Trusses, Hangers and Bottom slabs have been dismentled and cut intovarious pieces for transportation. All parts will be reassembled and some parts will be modified to fit the requirementfor the bridge. Only formworks, which are external and internal web panels, external and internal top panels, will beredesigned to comply with the bridge shape. All other equipments such as hydraulics, tension bars, etc. will be reused asmuch as possible. New Phra Nangkloa bridge composed of several spans with the typical span of 48.50 m to beconstructed by this MSS. This includes superstructure from pier no.4 to pier no.15. The superstructure of the bridge is27.70 m in width and 15.34 m wide at the bottom. The maximum cross fall slope is 4.0% with the maximumlongitudinal slope of 4.0 %. The main scope of work is the design of the MSS. NRSC will also provide engineeringknow-how, technical support and advice on the construction of such bridge. This paper presents several designchallenges due to site constraints and bridge construction itself. These challenges include special considerations toensure efficient installation and launching of MSS, and operation the MSS which has total weight about 3,650 tons overthe existing road. The project is currently under construction with the expected completion date in May 2008.
KEYWORDS : Movable scaffolding system, MSS, Prestressed concrete bridge
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