Policy and Market Size
The Ministry of Housing and Urban-Rural Development's Guiding Opinions on Promoting the Coordinated Development of Intelligent Construction and Building Industrialization call for smart construction sites, so people, machinery, materials, and the environment are managed from digital records. The China Construction Industry Association counts more than one million projects under construction nationwide. Smart-site penetration rose from about 15% in 2020 to about 35% in 2024. iResearch puts the 2024 market above 40 billion yuan, growing about 25% a year. Sites are often in suburbs and newly built districts, where wired coverage is thin, so 4G/5G cellular is the usual link.
Core Pain Points
People and attendance: Crews turn over quickly. Real-name registration, attendance, location, and whether a helmet is on all need a live view. A paper register is slow and easy to fake. Machinery: Tower cranes, hoists, and excavators are spread across the site. Running state and safety parameters have to be reported as they change, with an alarm past the limit and maintenance before a failure. Dust and the surroundings: PM2.5, noise, and video have to be online to meet environmental and safety-supervision rules. A short stay: A site does not last long. Equipment has to be set up fast and moved again. A wireless link beats a cable.
Standards and Terms
The set includes JGJ/T 434, Technical Standard for the Construction-Site Supervision Information System, and JGJ 59, Standard for Construction Safety Inspection. Terms in daily use: 4G/5G (cellular IoT, the main link on a site); NB-IoT (narrowband, suited to a smoke sensor or a water-immersion sensor); M2M (device-to-platform communication); BIM (building information modeling); AIoT (AI plus IoT, for video analysis and behavior recognition). A tower-crane black box and video use 2–8 Mbps upstream. A dust sensor on NB-IoT reports every 5–15 minutes. Sites sit in the suburbs, and switching operators can lift the online rate.
Who Builds It
The chain runs from site platforms (Glodon, Pinming, and Luban Software) through sensors and equipment (Hikvision, Dahua, and Uniview) to the connectivity layer. Glodon and Pinming lead the software share. One large contractor put 4G attendance, tower-crane monitoring, and dust monitoring on more than 100 live projects, and joined the housing and environmental platforms. Violation detection rose 60%, and the safety-incident rate fell by about 25%.
Where IoT Is Used
People: A turnstile, face attendance, and a connected location band or helmet cover real-name registration, who is on site, a geofence, and an alarm in a danger zone.
Machinery: A tower-crane black box, a hoist, and an excavator report running parameters, load, and tilt over 4G, with an over-limit alarm and anti-collision.
The environment: Dust, noise, and weather sensors join the environmental platform. Video plus AI flags a violation.
Materials and progress: A weighbridge, material RFID, and progress photos go online and feed cost and schedule.
Where the Market Is Heading
BIM is being joined to the IoT data. A site can have a digital twin. AI video for helmets, high-visibility vests, and danger zones is spreading. The site platform is being connected to the smart city and to CIM (city information modeling).
Summary
A smart site depends on IoT to sense and supervise people, machinery, the environment, and video. SimtoLink supplies 4G/5G and NB-IoT SIM cards and communication modules, with more than one operator, built for a rough site, so the equipment stays online while the contractor moves the job onto a digital record.