During the shaft construction process, the installation standards of the support structure and guardrails are crucial to ensure construction safety and shaft stability. Here are some key standards and guidelines:

   1. Support structure

   ① Strength and stability: It should be designed according to factors such as the depth, diameter, geological conditions and construction requirements of the shaft to ensure that it can withstand the pressure of the soil around the shaft and the working load of the tunnel boring machine.

   ② Installation accuracy: The installation of the support structure should ensure its verticality and horizontality to ensure the tunneling direction of the tunnel boring machine and the stability of the shaft.

   ③ Connection firmness: The various components of the support structure should be firmly connected to prevent loosening or falling off during the tunneling process.

   2. Guardrails

   ① Height and strength: The height of the guardrail should meet the relevant safety standards to prevent people and objects from falling. At the same time, the guardrail should have sufficient strength to withstand possible impact forces.

   ② Installation location: The guardrail should be installed at the shaft mouth and working platform to ensure the safety of personnel.

   ③ Clearance requirements: The clearance of the guardrail should comply with relevant safety standards to prevent people and objects from falling through the gap.

   It should be noted that the specific installation standards may vary depending on the region, project type and relevant regulations. Before carrying out the construction of the shaft boring machine, you should understand the relevant local regulations and standards in detail, and install the support structure and guardrail in strict accordance with the requirements. At the same time, the support structure and guardrail should be inspected and maintained regularly to ensure that they are always in good working condition.