The Hong Kong Link Road (HKLR) is part of the prominent structure, Hong Kong-Zuhai-Macao Bridge (HZMB), connecting 3 vibrant cities in Southern China. The works which are administered under Highways Department of HKSAR comprises design and construction of approximately 9km of viaducts. About 7km of the viaducts are marine structures with three navigation channels. The basic structural form of the viaducts is precast segmental prestressed concrete box girder. The span length of the viaducts ranges from 35m to 180m. Balanced cantilever method is selected due to the variability of the span lengths and flexibility in construction. The piers consist of both castinsitu and precast concrete structures. The viaducts are supported on bored piles with diameters ranging from 2.2m to 2.8m. Foundation in areas with complex geology such as fault zones has posed a major challenge to the job. Some piles are over 100m long due to complex geology. This paper presents the challenges and solutions employed in the design and construction of the viaducts. It describes the prestressed schemes employed in both the decks and piers with special details used in the formation of monolithic deck-column connections. The three main Challenges on the project were the erection in open sea, the vicinity of the Airport and enverinmental constraints.
The Bukit Panjang light rapid transit (LRT) system, a groundbreaking project for the Land Transport Authority of Singapore, was designed to serve as a feeder to the existing mass rapid transit network and the Bukit Panjang bus interchange. The main civil engineering elements consist of 7$8 km of twin-track elevated guideway, 14 stations and a maintenance depot with an operation control centre. The system was completed and opened to the public in November 1999. This paper discusses the design and construction of the LRT guideway, which consists mainly of precast prestressed concrete segmental box girder bridges with epoxy glued joints and internally prestressed tendons. The bridge decks are predominantly simply supported spans ranging from 15 to 34 m; however, a few special decks are made continuous due to stability requirements. Two overhead launching girders were employed for erecting the guideway. Due to specific site constraints and system requirements, the alignment was characterised by numerous tight curves with a minimum horizontal radius of 60 m. The geometry control method and construction equipment, such as the casting cells and the launching girders, were tailor-made in order to tackle the unconventional situation. Some operation and maintenance aspects of the system are also covered in this paper.
The Bukit Panjang light rapid transit (LRT) system, a groundbreaking project for the Land Transport Authority of Singapore, was designed to serve as a feeder to the existing mass rapid transit network and the Bukit Panjang bus interchange. The main civil engineering elements consist of 7·8 km of twin-track elevated guideway, 14 stations and a maintenance depot with an operation control centre. The system was completed and opened to the public in November 1999. This paper discusses the design and construction of the LRT guideway, which consists mainly of precast prestressed concrete segmental box girder bridges with epoxy glued joints and internally prestressed tendons. The bridge decks are predominantly simply supported spans ranging from15 to 34 m; however, a few special decks are made continuous due to stability requirements. Two overhead launching girders were employed for erecting the guideway. Due to specific site constraints and system requirements, the alignment was characterised by numerous tight curves with a minimum horizontal radius of 60 m. The geometry control method and construction equipment, such as the casting cells and the launching girders, were tailor-made in order to tackle the unconventional situation. Some operation and maintenance aspects of the system are also covered in this paper.
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