Completed the test and commissioning of the tunnel excavator on Nhon urban railway – Hanoi station

The Hanoi Urban Railway Project Management Board said that the TBM ‘Express’ – ‘Bold’ pair of tunneling machines of the urban railway No.3, section Nhon – Hanoi station has completed the test. test run collection. Before officially put into operation, TBM needs to meet the prerequisites technical requirements, requiring careful preparation from stakeholders.

Photo: MRB Le Trung Hieu, Deputy Head of the Hanoi Urban Railway Project Management Board, said that the TBM apparatus is designed specifically for the project of urban railway No.3, section Nhon – Hanoi station. The machine is manufactured by Herrenkecht (Germany), has a length of more than 90 meters, weighs about 850 tons, enough to accommodate machine equipment and operating workers. The peach shield with a prominent red and yellow flag pattern, has a diameter of 6.58m, weighs 65 tons, including main parts such as cutting heads, rake blades, tilling tools and bucket teeth, etc. with geology of Hanoi.
Currently, 2 tunneling machines have completed the test and commissioning. Auxiliary works such as installation of air compressor station, water supply station, mortar mixing station, ventilation will be completed in the end of April.
In order to officially put into operation, the Hanoi Urban Railway Management Board has cooperated closely with the consultant, contractors and related parties to ensure the quality of tunneling machines and related work. assessment before construction.
Firstly, the TBM duo must be confirmed from the concerned parties that they have met the performance requirements including: Completed and complete installation; Integration with support systems is appropriate; Qualified critical process parameters; The functions of components and control systems work normally and are in accordance with requirements.
Through the pre-acceptance test at the site (SAT), the TBM machine has been checked the operation, parameters and measurement of the main components, including the equipment: digging shield, control room, material chamber , Conveyor, conveyor, drilling equipment, main drive, tunnel mounting kit, hydraulic system, lubrication system, plumbing system, gas system, safety system, electrical system, systems support system.

Second, special attention is paid to monitoring before, during and after construction. The Contractor has analyzed the affected area when designing to conduct a “buidings condition survey” (BCS) survey for all houses in the affected area. From the condom results, the Contractor has risk assessment analysis (BRA-buildings risk assesstment report) for buildings during construction. Photo: MRB Based on the BRA report, the contractor designs and installs monitoring equipment for buildings and ground, including: Monitoring settlement, inclination, fissure (if any), groundwater level … This will be installed prior to construction and will be monitored during construction for abnormal warning (if any).
In case of abnormal monitoring, the contractor will analyze the cause, assess the level of danger … and based on that result to have a plan for the construction to continue or stop to handle the problem. subject. This is a strict, closed process to ensure the most safety for the above and adjacent buildings.
Compared with conventional tunneling methods, TBM drilling method is said to minimize the impact of traffic, occupy less area or affect surrounding constructions. Because soil can be collected and transported after excavation, this method causes less dust, vibration and noise compared to other tunneling methods. This construction method is environmentally friendly. TBM (Tunnel Boring Machine) works on the principle of soil pressure balance. Behind the digging shield is arranged a closed partition. The soil from the excavated shield will fall into the space and create a pressure balance between the excavated soil and the unearthed soil, making the digging mirror stable and not landslides. The soil pressure in the balance chamber is monitored by sensors placed directly in it. After a short 1.5m excavation, the tunnel cover (which is assembled reinforced concrete slabs) is immediately constructed. Where the drill goes, the cover of the tunnel is assembled there to avoid landslide of the soil and rock above. According to the design, in ideal conditions, each day the machine will dig about 10m tunnels.
When put into operation, the TBM duo will start drilling from S9 station to S12 station – Hanoi station at the end of Tran Hung Dao street with a total length of 4km.