Subway bolted segmental construction method:

1. Subway bolt wedge segment installation method: A hydraulic jack equipped with weapons can push the connecting segment outward along the axial direction to expand the space for insertion indoors.

2. Actual operation of subway bolt jacking hydraulic jack: It is crucial for the jacking hydraulic jack to be rounded and excavated in sequence with the pipe segment assembly.

3. Method for assembling subway bolts into a ring: Seamless assembly.

4. Re-tighten bolt connections on the subway bolts: Ensure the radial bolt connections are sufficiently tightened.

5. Subway bolt assembly sequence: Standard (A-type) segment - Standard segment - Adjacent (B-type) segment - Keel-shaped (K-type) segment.

6. Subway bolt tightening: First, tighten the circumferential (between the segments) connecting bolts, then tighten the radial (between rings) connecting bolts.

7. Subway Bolt Fastening Connections: First, tighten the circumferential (between tube segments) connection bolts, followed by the axial (between rings) connection bolts. 5.楔形管片安装方法：Equip jacks that can push adjacent tube segments outward radially to increase the insertion space.

8. Subway bolt assembly sequence: Lower standard (A-type) segment - Standard segment - Adjacent (B-type) segment - Keel (K-type) segment

9. Operation of subway bolt shield jacking: It is very important to round off the shield jacking in sequence with the pipeline segment assembly.

Ensure tightness of subway bolt connections: Secure the axial bolt connections thoroughly.

Maintenance Methods for Subway Bolts:

The maintenance methods commonly used for subway bolts generally involve atmospheric steam curing. The maintenance system is primarily divided into pre-curing (Y), heating (S), holding temperature (H), and cooling.

Current issues with the steam curing process for subway bolts include: insufficient heat exchange intensity during the curing period when the air inside the curing chamber is heated, which easily leads to uneven heating of different parts of the same segment for large-scale pipe sections; low steam energy utilization rate and high energy consumption; and the common practice of linear temperature rise (i.e., heating to a high temperature at a certain rate) for steam curing of subway segments, which has the drawback of extended curing time.

The steam curing of subway bolts is a method of accelerating the hardening of concrete by using an external heat source to heat the concrete, which accelerates the hydration reaction of cement and the formation of internal structure. Its purpose is to shorten the template turnover period and improve productivity.

The metro bolted segment is a type of precast concrete lining (usually assembled in a circular pattern from multiple segments), primarily used for constructing subway systems or large-scale sewage pipelines. During tunnel excavation, the segments primarily serve as supports and act as waterproofing.

The subway bolted segment assembly presents and maintains a perfect circle, which is crucial for ensuring tunnel dimensional accuracy, enhancing construction speed, improving waterproofing, and reducing ground settlement.