Page 46 - BTSGroup ONE REPORT 2021/22_EN

44 l Introduction l Nature of Business l Organisation and Shareholding Structure l Business Review l Corporate Governance l Financial Statements l Other Information l

There are three main components in BTSC civil works. a prefabricated concrete structure assembled together by an Internal Tendon
system installed at the site and in-place casting system. I-Girder is placed at
(i) Pier Column the location of the main beam to serve as support for the laying of both the
The pier column for the entire project is laid on foundations, both in the form ticketing floor and the platform floor. Most of I-Girder is moulded at the factory
of bored piers and barrette piles, which are drilled into the ground to a depth and moved to the job site for installation. Inspection of the station structure
of about 60 metres. The pillars are reinforced concrete structures. with structural cracks are checked every 6 months.

Structural subsidence is examined by survey data collection and comparison (iv) Track & Conductor Rail
in every 5 years. Each column has a benchmark level in order to conduct BTS track is a non-ballast double tracks with a width of 1.435 metres (Standard
a level camera survey according to the designer’s requirements. There is also gauge). The track type is 60 E1 (UIC60) with dimensions and shapes according
a check for any cracks occurring at the column structure every 6 months. to EN13674-1 and weighs approximately 60 kg/metre. A conductor rail in
the BTS SkyTrain system is a third rail located a distance of 1.4 metre from the

(ii) The Structure of the Runway Bridge (Viaduct) centre of the runway along the length of the route in both directions. It is
There are 2 types of viaduct; Precast Segment Box Girder System and Cast in an aluminium rail which has a stainless-steel contact, thickness of 6 mm and
Place System. The Precast Segment Box Girder System uses precast concrete weighs about 17 kg/metre. BTSC has in place both interval preventive and
parts from the factory and then transports them to install at the site. They corrective maintenances for track and conductor rail depends on work task.
are sequenced, fastened to each other by the External Tendon system. Also,
the Pier Segment is placed on both sides of the Pier Column, which is the 3.2 Electrical and Mechanical Works
load taken from Anchorages. For the Cast in Place System, is a structure that (i) Rolling Stock
requires periodic casting of concrete at the work site. The cast structure is Green Line rolling stock
fixed in place with the Internal Tendon system. This type of structure can be Initially, BTSC owned a total of 35 trains, all manufactured by the Siemens
found in the structure with a length of more than 30 metres and in the Silom Group. Specifically designed to suit the use and conditions in Bangkok, the
Extension Line from Saphan Taksin - Bang Wa. 35 trains consisted of three-car trains, with a total capacity to carry up to
1,106 passengers (126 sitting and 980 standing), whereas the BTS Sky Train
There is an internal inspection of the bridge structure (inside viaduct) in station has the capacity to take a train with up to six-car trains. The trains
every 5 years. The inspector checks the support points for the runway bridge run on AC motors, receiving electricity from the third rail system. The average
(Bearing pad/Pot Bearing), the Anchor, the Tendon and the cracks of concrete train speed in service is approximately 35 kilometers per hour (including time
Segment Box Girder. for passengers boarding the trains), with a maximum speed of 80 kilometers
per hour. Every car train is equipped with 42 seats along its length and 2
(iii) Main Station Structure air-conditioning units. The car trains are connected by a walkway to allow
There are 2 beam structures which are the main beam (Cross Beam) and passengers to walk between the car train. The wheels are equipped with the
sub-beam (I-Girder). The Cross Beam is placed at the column position and is damping ring in order to reduce the noise level.