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THAIRATH TV Originals

30 Aug 201404:42

Summary

TLDRThe video covers the construction of the extended Blue Line subway in Bangkok, focusing on the underground tunnel under the Chao Phraya River. This project, using advanced Japanese technology, marks Thailand's first tunnel under the river. The tunnel is built with reinforced concrete to prevent collapses and water leakage. Construction challenges include uneven soil conditions, especially near the river. Upon completion in 2017, the subway will significantly improve transportation between Thonburi and Phra Nakhon. The project will feature both underground and elevated tracks, enhancing connectivity across the city.

Takeaways

🚇 The script discusses the construction of an underground skytrain project, specifically the Blue Line extension in Bangkok, Thailand.
📅 The project is expected to be completed by 2560 (2027 in the Gregorian calendar), with just a few years remaining.
🔄 The completion of the project will greatly facilitate travel between Thonburi and the main city area, making it much easier for commuters.
🌐 This is the first time Thailand is constructing a tunnel to transport passengers under the Chao Phraya River.
🚀 The tunneling process uses a Japanese technology called Earth Pressure Balance (EPB), which is a shield tunneling method.
🏗️ The tunnel lining consists of large concrete segments reinforced with steel, designed to prevent soil collapse and water infiltration.
🔩 The segments are assembled on-site, with an average of about 12 rings (segments) being constructed per day.
📏 Each segment has a specific size, with a diameter of 570 mm at the center, a thickness of 30 mm, and an approximate length of 120 mm.
💸 The project is budgeted at over 10 billion baht and is expected to be completed around October 2558 (2015 Gregorian calendar).
🔩 The tunnel will be approximately 20 meters below the water level and 10 meters below the ground surface, with a total depth of 30 meters.
🚉 The project is part of the Blue Line extension, which is divided into two sections: the first from Hua Lamphong to Bang Kae, with 5 stations, and the second from Bang Sue to Tha Phra, with 10 stations.

Q & A

What is the current status of the Blue Line MRT extension project mentioned in the script?
-The script indicates that the construction of the Blue Line MRT extension is underway and is expected to be completed within the next three years by 2560.
What is the significance of the tunnel construction under the Chao Phraya River as part of the MRT Blue Line extension?
-The tunnel construction under the Chao Phraya River is a first in Thailand, serving as an underground transportation link for passengers between Thonburi and the Phra Nakhon side.
What type of tunnel boring technology is being used for the MRT Blue Line extension project?
-The project is utilizing a closed-face Earth Pressure Balance (EPB) shield tunnel boring machine, which is a technology imported from Japan, as well as hydraulic tunnel boring.
What materials are used to construct the tunnel segments for the underground MRT?
-The tunnel segments are made of reinforced concrete plates designed to prevent soil collapse and to prevent groundwater from entering the tunnel, while also reducing abnormal air pressure.
What is the average number of tunnel rings that can be assembled per day during the construction of the MRT Blue Line extension?
-On average, about 12 tunnel rings can be assembled per day.
How deep will the tunnel be constructed from the water level and ground level?
-The tunnel will be approximately 20 meters below the water level and an additional 10 meters below ground level, totaling 30 meters deep.
What is the estimated budget for the construction of the tunnel under the Chao Phraya River for the MRT Blue Line extension?
-The estimated budget for this part of the project is over 10 billion baht.
What is the total length of the tunnel that will be constructed under the Chao Phraya River?
-The total length of the tunnel is 2.6 kilometers for one way, making it 5.2 kilometers for a round trip.
How many stations are planned for the first section of the MRT Blue Line extension from Hua Lamphong to Bang Kaeo?
-There will be a total of 5 stations serving the 14-kilometer first section of the MRT Blue Line extension.
What are the challenges faced during the construction of the tunnel segments for the MRT Blue Line extension?
-The main challenges include the unevenness of soil layers and sand layers, especially in areas close to the river, which require expertise, experience, and special techniques to ensure quality and safety in construction.
What is the expected completion date for the tunnel boring under the Chao Phraya River for the MRT Blue Line extension?
-The tunnel boring is expected to be completed around October 2558 (2015 in the Gregorian calendar).

Outlines

00:00

🚇 Expansion of the Blue Line Subway Project

The script introduces the viewer to the construction site of the underground Blue Line subway extension in Bangkok, Thailand. The project is expected to be completed by 2560 (2017 in the Gregorian calendar), and it aims to provide convenience for commuters between Thonburi and the main city area. A significant feature of this project is the construction of the tunnel under the Chao Phraya River, a first for Thailand. The script describes the process of tunneling using a shield machine with Earth Pressure Balance technology from Japan and hydraulic propulsion. The tunnel sections are composed of large concrete and steel-reinforced pieces designed to prevent soil collapse and water infiltration. The construction is meticulous, with an average of 12 rings being assembled per day, each with specific dimensions. The tunnel will be approximately 20 meters below the water level and 10 meters below ground, with a total depth of 30 meters. The construction is part of a larger contract and is expected to be completed by October 2558 (2015 Gregorian). The script also mentions the overall Blue Line extension, which is divided into two sections: the first from Hua Lamphong to Bang Kae with 5 stations and 14 km of track, including 5 km of underground track, and the second from Bang Sue to Tha Phra with 10 stations and 13 km of elevated track.

Mindmap

Keywords

💡Blue Line Extension Project

The Blue Line Extension Project refers to the construction of an extended route for Bangkok's underground metro system. This expansion aims to connect more parts of the city, particularly the Thonburi and Phra Nakhon areas, improving accessibility for citizens. The project is scheduled to be completed within three years, making transportation more efficient across the city.

💡Chao Phraya River Tunnel

The tunnel under the Chao Phraya River is a key part of the Blue Line extension. It is significant as it marks the first time in Thailand's history that a tunnel for passenger transport is being constructed beneath the river. The tunnel will enable easier transit between both sides of the river, improving connectivity between Thonburi and Phra Nakhon.

💡Earth Pressure Balance (EPB) Technology

Earth Pressure Balance (EPB) is a tunnel boring technology imported from Japan, which is used in this project to dig through the underground earth while maintaining soil stability. The technology is crucial in preventing collapses or soil movement during tunnel excavation. This method is mentioned in the script in relation to its importance in handling the varying soil and sand layers encountered during the construction.

💡Hydraulic Tunnel Boring Machine

A hydraulic tunnel boring machine is utilized to dig through the earth for the underground metro. It operates by pushing itself forward hydraulically while installing segments of the tunnel walls behind it. The script emphasizes its role in the precision and safety of the construction process, especially in laying down reinforced concrete tunnel segments.

💡Reinforced Concrete Segments

Reinforced concrete segments are large, pre-fabricated sections of the tunnel that are assembled to form the tunnel's walls. These segments are designed to prevent soil collapse and water seepage into the tunnel. The script describes how five large segments and one smaller part are fitted together to create each ring of the tunnel.

💡Ventilation Shafts

Ventilation shafts are vertical structures built into the tunnel system to allow air circulation, ensuring that passengers and workers inside the tunnel can breathe safely. The video discusses the importance of these shafts in maintaining air quality within the underground metro system, especially during construction.

💡Independence Station to Sanam Chai Station

This 2.6 km section is part of the route being constructed in the Blue Line extension. The total round trip will be 5.2 km, and it marks a critical phase of the project. The construction of this section involves complex tunneling beneath the Chao Phraya River, highlighting the project's technical challenges.

💡5.2 km Round Trip Tunnel

This refers to the total distance for the round trip between Independence Station and Sanam Chai Station, part of the Blue Line extension. The round trip covers both the outbound and return journey beneath the Chao Phraya River, emphasizing the scale of the tunneling efforts.

💡14 km Elevated and Underground Route

This describes the overall distance of the Blue Line extension, which includes both underground and elevated segments. From Hua Lamphong to Bang Khae, the route covers 14 km, with 5 km being underground and the remaining 9 km elevated. The video explains how this extension will significantly enhance transport efficiency in the city.

💡Varying Soil and Sand Layers

The difficulty of tunnel construction is heightened by the inconsistency of the soil and sand layers near the river, which can lead to instability. The video mentions this as one of the major challenges of the project, requiring advanced techniques and skilled labor to ensure the safety and success of the tunnel excavation.

Highlights

Construction of the Blue Line MRT underground extension is underway.

The project is expected to be completed by 2027, providing convenience for travel between Thonburi and the Grand Palace areas.

This marks the first time an underground transportation tunnel is being constructed under the Chao Phraya River in Thailand.

The tunnel will be constructed using a closed-face Earth Pressure Balance (EPB) shield tunneling machine, a technology imported from Japan.

Hydraulic machines will be used for the tunnel boring, pushing the machine forward and then installing tunnel lining segments.

Each tunnel lining ring consists of 5 large segments and 1 small segment, made of reinforced concrete designed to prevent soil collapse and water infiltration.

The tunnel lining will have a diameter of 570 mm, a thickness of 30 mm, and an approximate length of 120 mm.

On average, about 12 tunnel lining rings can be assembled each day.

The tunnel will be approximately 20 meters below the water level and 10 meters below the ground surface, totaling 30 meters deep.

The tunneling will be carried out according to Contract 2, starting from Israpa Station to Sanam Chai Station, covering a distance of 2.6 km.

The total budget for the project is over 10 billion baht, with an estimated completion in October 2025.

The construction of the underground tunnel is part of the Blue Line MRT extension, divided into two sections: the first section from Hua Lamphong to Bang Kaeo, spanning 14 km with 5 stations, and the second section from Bang Sue to Tha Phra, spanning 13 km with 10 stations.

The first section includes 5 km of underground track, followed by an elevated section from Tha Phra to Bang Kaeo, covering 9 km with 7 stations.

The construction challenges include the unevenness of soil layers and the proximity to the river, requiring specialized expertise and technology.

The project is expected to be completed in just 3 years, significantly improving the ease of travel between Thonburi and the Grand Palace areas.