Demolition of Cement Prefabricated Houses in Dehong

When carrying out the demolition of cement prefabricated houses in Dehong, it is necessary to follow a scientific process and pay attention to safety and environmental protection. The specific steps are as follows:

1. Safety Assessment and Plan Formulation

Before demolition, a professional organization should be commissioned to conduct a comprehensive safety assessment of the house structure, focusing on analyzing the load-bearing capacity of the prefabricated panels, connection methods, and surrounding environmental risks. Based on the assessment results, a detailed demolition plan should be formulated, clarifying the demolition sequence (such as demolishing from the top floor down layer by layer), a list of tools (electric hammers, cutting machines, etc.), personnel assignments, and emergency plans. For example, if the prefabricated panels are connected to the walls via steel bars, the cutting sequence of the steel bars should be prioritized to avoid structural instability.

2. Selection of a Professional Demolition Team

There are several experienced demolition teams available in the Dehong area:

• Zhao Xingfa Demolition and Handling Construction Team: Provides services such as old house demolition and wall demolition, and is skilled at handling complex structural connections.
• Dehong Jixiang Demolition Team: Focuses on renovation demolition, covering scenarios such as storefronts and hotels, and has the ability to control dust and handle waste.
  When selecting a team, it is necessary to verify its qualifications, past cases, and safety records to ensure compliance with the requirements of the Technical Code for Safety in Building Demolition Engineering.

3. Demolition Steps and Key Control Points

1. Cutting Connections: Use angle grinders or gas cutting equipment to disconnect the steel bar connections between the prefabricated panels and the beams and columns, retaining key structural steel bars for subsequent repair.
2. Local Crushing: Use electric hammers to drill holes on the surface of the prefabricated panels, inject expanding agents, or use hydraulic splitting machines for vibration-free crushing to reduce the impact on adjacent structures.
3. Block Lifting and Removal: Cut large prefabricated panels into blocks and remove them one by one using tower cranes or truck cranes to avoid the risk of overall tipping.
4. Dynamic Monitoring: Use laser leveling instruments to monitor the verticality of the house in real-time during the demolition process. If a deviation exceeding 5mm is found, work must be stopped immediately for adjustment.

4. Safety and Environmental Protection Measures

• Personnel Protection: All operators must wear dust masks, safety helmets, and cut-resistant gloves. Those working at heights must wear safety harnesses.
• Dust Control: Equipped with mobile mist cannons for water spraying and dust reduction, and set up dust screens around the demolition area to ensure that the PM10 concentration is below 150μg/m³.
• Noise Management: Avoid working during residents' rest periods and use low-noise equipment (such as electric cutting machines instead of diesel-powered ones).
• Waste Disposal: Concrete fragments must be transported to designated disposal sites, and steel bars and other metal materials should be recycled. Random dumping is strictly prohibited.

5. Subsequent Structural Inspection and Repair

After the demolition is completed, ultrasonic testing should be carried out on the remaining structure to confirm that there are no cracks or loose areas. The demolished areas should be filled with high-strength grouting materials. If the load-bearing structure is involved, carbon fiber cloth reinforcement should be added to ensure that the overall stability of the house meets the requirements of the Standard for Reliability Appraisal of Civil Buildings.