The MRT Orange Line (East Section)

Civil Works Structure

1. Underground Structures (Tunnel)

In general, the underground construction, in MRT Orange Line (east), consists of twin bored tunnels approximately 6.3 meters in diameter and 6.3 meters apart in horizontal configuration but in some area, due to construction constraint by area or existing bridge foundation, the twin tunnels has to be stacked or cut&cover tunnels has to be built instead.

Horizontal and Stacked Twin Bored Tunnels

cut&cover tunnels

2. Elevated Structures

The elevated construction feature the elevated viaduct factory precast structures, site install for a rapid construct, accommodating the MRT rail system with a single support every 30-40 meter.

Viaduct structures on single support

3. Station Structure

MRT Orange Line (east) “Thailand Cultural Center – Min Buri” has both underground and elevated station divided in to 10 underground stations and 7 elevated stations as follows.

Station Name	Station Name	Type	Detail of Station Location
OR13	Thailand Cultural Centre	Underground	Located on Ratchadapisek Road in front of Esplanade Ratchadapisek Department Store. The station is connected to Chaloem Ratchamongkhon Line.
OR14	MRTA	Underground	Located in the MRTA area.At the Entrance on Rama IX Road.
OR15	Wat Phraram Kao	Underground	Located under Rama IX Road. At the intersection Rama IX - Pradit Manutham.
OR16	Ramkhamhaeng 12	Underground	Located under Ramkhamhaeng Road.In front of the Mall Department Store Ramkhamhaeng.
OR17	Ramkhamhaeng	Underground	Located under Ramkhamhaeng Road. In front of Ramkhamhaeng University.
OR18	SAT	Underground	Located under Ramkhamhaeng Road. In front of Rajamangala Stadium.
OR19	Ramkhamhaeng 34	Underground	Located under Ramkhamhaeng Road. In front of Ramkhamhaeng Hospital.
OR20	Yaek Lam Sali	Underground	Located under Ramkhamhaeng Road. At the intersection of Lam Sali (as to Yellow line Project).
OR21	Si Burapha	Underground	Located under Ramkhamhaeng Road.In fornt of Big C Extra Sukaphiban 3.
OR22	Khlong Ban Ma	Underground	Located at Ramkhamhaeng Road, Soi 92 - 94.
OR23	Sammakon	Elevated	Located on Ramkhamhaeng Road. Area near Sammakorn Village.
OR24	Nom Klao	Elevated	Located on Ramkhamhaeng Road.In fornt of Triam Udomsuksa Numklao School.
OR25	Rat Phatthana	Elevated	Located on Ramkhamhaeng Road. In front of Miss Teen Company headquater.
OR26	Min Pattana	Elevated	Located on Ramkhamhaeng At the entrance of Wat Bang Peng Tai opposite the BangChan Industrial Estate.
OR27	Keha Ramkhamhaeng	Elevated	Located on Ramkhamhaeng Road. In front of Soi Ramkhamhaeng 184 near Ramkhamhaeng Housing Estate.
OR28	Min Buri	Elevated	Located on Ramkhamhaeng Road on the south bound near khlong Song Tonnun Bridge(as a station connected to the Pink Line Project).
OR29	Yaek Rom Klao	Elevated	Located on Ramkhamhaeng Road on the south bound near Suwinthawong Intersection.

1) Underground Station

There are different underground station models based on the characteristics of the deck platform configuration for passengers. The three typical types of configuration as follows: central platform, a station with rail alignment at each side of the platform and a single concourse located directly above. This configuration is most typical one.

Central platform

Next, stacked platform, a station with two levels for side platforms and a single concourse located above. This configuration is applied where the existing bridge impede the construction of tunnel and limit R.O.W. and stacked tunnels have to be constructed.

Stacked platform

Last, side platform, a station with twin platforms each side of central rail alignment with a single concourse located directly above. This configuration is applied when cut and cover tunnel is employed.

Side platform

Their are structure for ventilation at the head and the end of each station for air circulation in the station area. In the event of a fire, this structure also allows the officers to take control of the situation and helps to evacuate passengers from the platform.

2) Intervention Shaft

The main function of an intervention shaft is to relieve air pressure from the tunnels. Since tunnel size is a little larger than train, when the train runs inside the tunnel, it will act like a piston and increase the air pressure. It is necessary to vent the air pressure to the outside. In addition, when the underground station is located more than a kilometer away, the intervention shaft act as an emergency exit to serve as the evacuation point for passengers in the event of an accident. For this project, there are total of 11 intervention shafts.

Intervention shafts

3) Elevated station

Almost every elevated station has a layout of a sided platforms. The station is divided into 2 levels: Concourse level, approximately 8 meters above road level and platform level, approximately 15 meters above road level. The station is approximately 150 meters long and 25 meters wide and supported by a column every 30 meters on the road median.

In general, there are 4 entry point to an elevated station, located at every corner of the station and the adjacent entry point can be used as a crossroads for people.

Elevated Station