Developments Adjacent To Existing MRT Structures

Code of Practice for Railway Protection has been implemented by the Development & Building Control (DBC) Department of Land Transport Authority (LTA), Singapore to safeguard the existing MRT Structures against the any possible damages that may be caused due to the construction development that is taking place. This paper describes to some of the requirements that are to be compiled by developers and engineers in the planning and design of construction activities of this type of nature. In this paper, we will discuss about the code of practice and some of the requirements that are crucial to engineers who are undertaking planning of this type of development.


1.      Introduction

Given the wide network of the MRT system in Singapore and rate of building development, the potential of land development along MRT lines is very high. In order to carry out such development, it is very common to see building structures and basement structures adjoining to or directly above the existing MRT lines.

Such construction must be carried out in a manner according to the Code of Practice to avoid detrimental effects on the sensitive MRT structures. It is important to have proper and adequate precaution/ protection measures incorporated in the design and construction works to avoid such effects.

2.      Safety and Protection


2.1 Code of Practice for Railway Protection

New developments that are taking place in close proximity to existing MRT lines are subjected to the approval of Land Transport Authority (LTA). Full compliance of the technical requirements must be achieved as specified in the Code of Practice for Railway Protection. The Code requires the developers to ensure that the movement of the MRT structures is limited to the following requirements:

a)       Movement in any direction limited to 15mm;

b)       Rotation of the tracks limited to 1:1666 in any plane.

However, there are cases where the allowable limits may be adjusted according to the site conditions (Doran, et al, 2000). Special care has to be taken when undertaking installation of piles and diaphragm