Guangzhou metro 14 shield all the starting line 7 west extension of full operation

Recently, with the loud roar of the cutter plate of endeavour's shield machine, the right line shield was successfully launched between lintou and nanyong station (hereinafter referred to as "linnan section") of the west extension of line 7, indicating that the entire line of shield was launched. On the same day, between midea avenue and beijiao new town station (hereinafter referred to as "beijiao station"), the left line shield machine "urban rail youth" successfully emerged from the hole after overcoming multiple construction challenges (all are tentative names of the projects).

All shield launches complete

The western extension of line 7 is 13.447 kilometers long and has eight stations. Among them, transfer station 3, set yifeng parking lot 1. According to the construction plan, a total of 14 shield tunneling machines were put into operation on the entire western extension of line 7, while the smooth start of shield tunneling on the right line of linnan section marked the completion of the initial start of shield tunneling on the entire line.

The left line tunnel is 1002 meters long and the right line tunnel is 998 meters long. The shield machine starts from lintou station and extends eastward along national highway 105. It will go through the tanzhou waterway with a length of about 135 meters, side by side through the pile foundation of 110KV overhead pylon and lintou bridge, and finally reach nanyong station. In order to ensure the smooth tunneling of endeavour, the metro constructors developed a safe and feasible construction scheme and measures based on the experience of the initial construction, so as to ensure the safety and order of the initial construction and tunneling.

Establish a system risk prevention and control system to overcome multiple construction problems

The left line shield was launched in March this year. The urban rail youth is a soil pressure balance shield machine, with a total length of 85 meters, a diameter of 6.47 meters and a total weight of about 500 tons. In the process of shield tunnelling, the metro builders strengthened the ground with three-axis mixing pile for 15 months, with the total length of the interval reinforcement up to 2.3 kilometers, accounting for 60.2% of the total length of the interval line, greatly improved the geological conditions of shield tunnelling, and successfully overcome many problems such as the construction of weak strata.

In order to ensure the smooth progress of the shield machine, the project invited experts to demonstrate the major hazard sources and risk points of the project for many times, analyzed and demonstrated each risk point, and established a systematic risk prevention and control system. For example, according to the characteristics of construction risk of shield construction, a special safety emergency plan has been prepared. According to the characteristics of the initial construction risk of shield construction, an emergency leading group was established to prevent the construction risk of shield construction and solve the construction problems of shield construction. In addition, targeted safety and technical disclosure training was carried out for the field workers for many times to ensure the safety of the shield construction.

Up to now, 46 percent of the civil engineering projects in the west extension of line 7 have been completed. Of the eight stations, three main structures have been capped, and the remaining five are under civil construction. Of the eight sections, two have been completed and the remaining six are under civil construction. Civil construction of yifeng parking lot and access section.