Section 1: Construction Requirements for Boiler Chimney Demolition
(1) Chimneys are tall structures, and the demolition of boiler chimneys should refer to the relevant requirements for the demolition of building structures. Under the condition that on-site conditions permit, the removal should prioritize manual mechanical demolition or blasting methods, which are fast, cost-effective, and relatively safe. Chimneys come in several types, including brick chimneys, reinforced concrete chimneys, and a small number of steel pipe chimneys. This section mainly introduces the demolition procedures for brick chimneys and reinforced concrete chimneys. Before the specific operations, a detailed construction organization plan and special construction scheme should be prepared, and thorough written technical handovers should be conducted.
(2) Boiler Chimney Demolition Method:
When the site for chimney demolition is limited due to its small size and surrounded by buildings, making mechanical or爆破 demolition methods difficult, manual chimney demolition can be employed for the removal construction.
(3) The manual dismantling method typically involves setting up enclosed scaffolding around the perimeter. The operating level should be fully covered with scaffold planks, equipped with toeboards and guardrails. The perimeter is fully covered with a dense, flame-retardant safety net. Operators stand on the scaffolding and use hammers, pry bars, or jackhammers to dismantle. The dismantled materials fall inside the chimney. A sloping board is set up at the bottom of the chimney facing the door. The falling materials automatically slide out, allowing for timely removal.
During the summer thunderstorm season, when conducting artificial demolition work, lightning protection devices should be installed on the scaffolding.
Section 2: Technical Safety Regulations for Electrical Safety in Demolition Construction of Brick Chimneys
(1) Temporary electrical safety technical files for the boiler chimney demolition construction site, including the following contents:
1. Utilize all the materials from the organizational design.
Revise the documentation for the electrical organization design.
3 Power Technology Handover Documents
Electricity Engineering Inspection and Acceptance Form:
5. Test, inspection certificates, and debugging records for electrical equipment.
Ground Resistance, Insulation Resistance, and Leakage Protective Device Leakage Trip Parameters Measurement Record Sheet
7 Regular Inspection (Re-inspection) Schedule
8 Electrical installation, inspection, maintenance, and dismantling work records.
(2) The Technical Safety File for the demolition site of brick chimneys should be established and managed by the electrical engineer in charge of the site. The "records of electrical installation, inspection, maintenance, and demolition work" are under the care of the electrician, and should be reviewed and approved by the project manager on a weekly basis. These records should be archived together after the temporary electrical works are demolished.
(3) The temporary electrical project for the boiler chimney demolition should be regularly inspected. During the inspections, the grounding resistance and insulation resistance values should be rechecked.
(4) Regular inspections of the temporary electrical engineering for the boiler chimney demolition should be conducted by section and item, and potential safety hazards must be addressed promptly. Additionally, the review and acceptance procedures should be followed.
