The buildings near the commercial line are divided into three categories.

Construction near the business line is divided into the following three categories:

1, near the railway business line, the following projects that affect the stability, use and traffic safety of the business line equipment are listed as Grade A construction and must be included in the construction plan of the railway bureau.

(1) During hoisting operation, it intrudes into the range of 2m outside the overhead contact pole of electrified railway and 1m outside the signal pole of non-electrified railway (hereinafter referred to as "safety clearance of business line equipment").

(2) Erecting or dismantling all kinds of iron towers, pillars and overhead contact poles. In the process of operation, it invades the safety gap of business line equipment.

(3) Subgrade excavation, line grouting, CFG pile and other constructions that affect subgrade stability.

(4) It is necessary to carry out speed limit construction on adjacent business lines.

2. The following engineering buildings near the business line that may endanger the traffic safety of the business line due to accidents such as collapse and falling are classified as Class B buildings. Class B buildings should be equipped with protective facilities and approved by the relevant departments of the Railway Bureau. If it is really impossible to set up protective facilities, it should be included in the construction plan of the railway bureau. The setting of protective facilities that affect the stability, use and traffic safety of business line equipment must be included in the construction plan of the railway bureau.

(1) Use a crane whose height or working radius is greater than the safe clearance distance between the crane and the business line equipment.

(2) Various constructions that affect the stability of railway communication towers, base stations, communication signal relay stations, power supply towers, pillars and other foundations.

(3) Construction equipment and materials such as cast-in-place beams, steel sheet piles, steel pipe piles, scaffolding, scaffolding, etc. Backward near the business line and intrude into the safety gap of the business line equipment.

(4) There may be objects falling in the business line cutting area, invading the safety clearance of business line equipment.

3. The following buildings near the business line that may affect the stability of railway subgrade and the safety of driving equipment are classified as Class C buildings.

(1) Construction machinery operations such as forklifts, excavators and bulldozers.

(2) Manual excavation of foundation pit and manual digging pile construction.

(3) Construction of communication, signal, power supply lamp, cable trench 10 meter, earth borrowing, subgrade rolling, etc.

(4) steel binding, template installation and removal, etc. Without intruding into the gap.

(5) Construction such as subgrade filling or soil abandonment.

(6) Other construction involving the stability of traffic equipment in business lines.