More than 500 Sensors in Hangzhou Metro Monitor Settlement

Uneven settling of a subway station in Shanghai will stop the station overhaul Hangzhou, which is also building a subway, has prepared hundreds of “security guards” in the face of “precipitation” and rainy days.

Yan'an Road subway tunnel installed more than 500 "sensors"

Yesterday a subway news from Shanghai caused the Hangzhou people to raise their ears. The Hailun Road Station on the Shanghai Metro Line 4 was found to have uneven settlement. The relevant authorities will use the least number of passengers during the year to seal the sector during the Spring Festival. Station overhaul, maintenance process and future safety will be guaranteed.

The Shanghai subway has been operating for many years. It can be said that it has rich experience and still has to face the issue of "subsidence." Then, is Hangzhou, which is building the subway, already having an advance on this issue?

Yesterday, the reporter chose Yan'an Road to visit the group. Recently, this prime location in Hangzhou has been very lively underground: From West Lake Avenue to Wulin Square, Metro Line 1 is being constructed. The Yan'an Road underground will be built in 5 underground tunnels, coincides with the route of the Metro Line 1 overlap.

Two projects, separated by a wall. How to prevent settling and ensure the safety of the subway? Hangzhou has come up with a good idea.

Yan'an Road, the construction unit of the Hangzhou Urban Infrastructure Development and Development Center, disclosed that they installed a remote sensor “static sensor” in the subway tunnel to monitor the settlement of the subway tunnel during construction.

Yesterday morning, the reporter put rain boots and raincoats into the wet Lung Cheung Bridge subway station, and this legendary "sensor" came into close contact.

In the right side of the Longxiangqiao Station West Line Tunnel, the reporter saw a row of things like a cylindrical gallery lamp placed on a shield ring, one every 1.2 meters. At first glance, it's like an ordinary street lamp, but Ge Pengfei, the deputy director of the City Center Center Project II, told us that this small “security guard” is not simple: “This is a static level meter that is specifically designed to monitor settlement. Vertical displacement."

The working principle of small “security” is not complicated. The instruments in this row are connected by tubes, the tubes are filled with water, and the level of each instrument is the same. If settlement occurs, the shield ring will be displaced. Then the instrument placed on it will also be displaced. When the water level changes, the instrument will alarm and send it to the construction unit and inspection unit in the form of mobile phone letters and e-mails.

Small "security" duties can be very heavy. “It took so much effort to observe the internal conditions of the subway because of the five tunnels on Yan’an Road. The distance between the tunnel floor and the top of the shield is very close. The nearest Renhe Road tunnel is only 3.9 meters away.” Ge Pengfei said, in order to ensure safety There is "double insurance".

In fact, in addition to the static level gauge, after the tunnel began construction, several workers insisted on manually measuring the horizontal displacement and convergence displacement inside the subway tunnel. "Comparatively, settlement will come more abruptly. Compared to manual inspections, the static level is a 24-hour remote monitoring system that is relatively efficient."

The subway tunnel on Yan’an Road is very long, so it is necessary to install more than 500 static level gauges. These static levelers are not small, but the cost is not low.

A lot of money is spent for safety. According to the plan, these instruments will be well adjusted before the Spring Festival, and will be used after the Spring Festival. It is not until the completion of the renovation of the main body structure of the tunnel.