Project 4S Labelling Project of Tunnel Construction

Smart Construction Solutions

Customised solutions

During the construction process of this tunnel, the deployment of wireless base station involves the following two aspects of the deployment requirements constraints:
(1) Deployment distance: In order to ensure the performance of self-organised network while taking into account the economic requirements, the test distance of 400 m still cannot meet the distance requirements of the wireless base station deployment scheme in real engineering scenarios.
(2) Deployment method: To avoid interfering with the passage of heavy machinery and vehicles, as well as to ensure the stability of the wireless base station installation, the wireless base station can not be installed on a tripod at a certain distance from the wall of the tunnel. The wireless base station were fixed on the tunnel wall, and the tunnel wall would absorb the wireless signals, which led to a reduction in the bandwidth of the self-organising network.
Based on the above two aspects of the deployment requirements, the key point of this customised solution is to optimise the deployment distance and method of the wireless base station in real engineering construction scenarios as much as possible, by reducing the influence of factors such as mechanical obstruction, tunnel curvature, dusty environment and so on.

Landlink wireless base station No. 1 is located at the tunnel wall at the tunnel entrance, which is at the 0-metre position; base station No. 2 is located at the 1,000-metre position; base station No. 3 is located at the 2,000-metre position; the distance between base stations No. 1 and No. 2, and between base stations No. 2 and No. 3, is 1,000 metres.

There is a 200-metre curved curved tunnel section within the 0-metre to 1,000-metre interval where Base Station No. 1 and Base Station No. 2 are located; there is less shelter within the 1,000-metre to 2,000-metre interval where Base Station No. 2 and Base Station No. 3 are located.

Connecting the cameras in the tunnel under the left tunnel table price (which should be on the trolley) to the Landlink network.

Project Outcome

1. This Landlink network deployment solution has been field-tested for long transmission distances and high network signal stability. The bandwidth between the test computer and the three base stations is up to 140 Mbps. The latency of the test computers and the entire link to transmit small packets (32 Byte) ranged from 3ms-93ms, with an average latency of 37ms. The latency of the test computers and the entire link to transmit big packets (65500 Byte) ranged from 22ms-524ms, with an average latency of 154ms. Therefore, Landlink technology achieves full coverage of high-speed network signals in the extreme environment in the tunnel.
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2. Landlink network guaranteed the data transmission capability of monitoring devices. The cameras can be transmitted in real time over the entire link and the camera rotation can be controlled in real time from the computer.

Smart Construction Solutions

Technical Innovations

Everything you need to know about this 4S Labelling Project.

What types of devices are allowed to be interfaced to the Landlink network?

The wireless base station allows access to all devices that support the IP protocol, including cameras, gas detectors, road gates, face recognition machines, and so on. By interface type port, devices can be roughly classified into three categories: devices with one network cable connector and one power connector, devices with only one network cable connector, and devices with 485 connectors.
For devices with one network cable connector and one power connector, the power connector is connected to the common power system in the tunnel through a power adapter, while the network cable connector is connected to the body network port of the wireless base drill and the network port of the POE switch. For devices with only one network cable connector, the network cable connector can be accessed to the POE network port of the POE switch, or it can be accessed to the POE converter and then split into a network cable connector and a power connector. The source connector is connected to the common power system in the tunnel through the power adapter, and the network cable connector is connected to the body network port of the wireless base station and the POE network port of the POE switch. For devices with 485 connectors, the 485 connector port is split into a network cable connector through a crystal head converter. The network cable connector port is connected to the POE network port of the POE switch.

If there is a network problem, will the Camera still work properly?

Yes, we have adjusted the quality of the camera to 720p to meet the needs of the screen and the network.

If one of the devices is damaged, will it cause the whole or local network to be paralysed?

When one of the devices is damaged, the central control room can monitor the specific code of the base station, so maintenance workers can quickly locate the network damage location, thus improving maintenance efficiency; if the two neighbouring Landlink base stations of the damaged base station are within the extreme matching distance, the connection will be re-established between these two base stations in order to avoid prolonged disconnection inside and outside of the tunnel, thus guaranteeing the construction safety.Translated with www.DeepL.com/Translator (free version)

What if the watch is in a non-working position?

To prevent the watch from being in a non-working position, our watches are equipped with a positioning function and a corresponding watch collection and dispatch programme.

If a power failure occurs inside the tunnel, will the network be paralysed?

In the event of an emergency power failure inside the tunnel, the device's built-in power supply supports stable operation of the device for up to 10h to keep the network up and running.

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smart Construction laboratory Ltd.

智能建造實驗室有限公司

4S Labelled Project of

Tunnel Construction

Construction of Baima Tunnel on the Jiu Mian Expressway, Sichuan

Customised solutions

Project Outcome

Technical Innovations

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