As an important facility in industrial production, the safety of the structure directly affects the normal operation of enterprises. In the jenan area, the reinforcement of the old chimneys is subject to strict construction specifications to ensure the quality and safety of the works. This paper will present to you the core elements of the maintenance of the pyramid chimneys from pre-construction preparation, key construction phases and quality control。
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I. Prepared for construction
1. On-site survey and detection
A full examination of the chimney structure, including crack detection, concrete strength testing and steel structure erosion assessment, is required prior to construction. Specialized equipment, such as ultrasound detection, rebroadcasters, can be used to determine precisely the location and extent of structural damage and to provide data support for subsequent reinforcement programmes。
2. Development of a dedicated construction programme
Targeted programmes based on the results of the tests are developed, with clear enhancements (e. G. Carbon fibre consolidation, steel additions, etc.) and construction processes. The programme is subject to review by a third-party body and is reported to the local housing department for filing to ensure compliance with the requirements of the guidelines for the construction and quality of chimney works。
3. Protective measures
Construction of closed construction areas, security alert signs and emergency rescue equipment. Construction personnel are required to conduct specialized training in high-altitude operations and to wear protective equipment such as hook safety belts and slippers to ensure safe control throughout the construction。
Ii. Operational points for key construction phases
1. Structural strengthening implementation
- fragmentation repair: pressure-plugging treatment of concrete cracks, selection of epoxy resin repair materials to ensure that the slurry permeates three to five times the width of the crack。
- stabilisation of steel structures: decomposed protection of rusty tower racks, application of thermal fuzzy process, no less than 80 m thick of zinc layers, and addition of an agular steel or carbon fibre sheet enhanced structural load。
- strengthening of the base: in the case of base deposition, ground-based stress can be adjusted by anchor stationary pillar technology to ensure vertical deviation of the chimney within h/1000。
2. High altitude operating norms
- construction platform: a hydraulic lift platform or a full-of-house scaffolding is to be constructed at a height of 1. 5 metres above the operational surface, and the load of the platform should be above 200 kg/m2。
- welding operations: before welding, welding operations must be preceded by the cleaning of flammable materials around the site, equipped with fire extinguishers, and high-altitude welding operations should be stopped when wind exceeds level 5。
Iii. Project quality and safety control
1. Quality acceptance standards
- concrete strength: concrete strength after consolidation needs to reach the original design level, with a success rate of not less than 95 per cent when rebuffing is used。
- verticality and deposition: upon completion, the vertical deviation of the chimney shall be h/1000 and the base deposition shall be controlled within 5 mm。
2. Construction security management
- daily pre-shift security technology, with certified induction of special operatives
- full-time security officers to supervise scaffolding, temporary electricity, etc.
- the construction of the rainy season requires adequate drainage measures to prevent rain impregnation。
The maintenance of the pyrotechnic chimneys is highly specialized and needs to be carried out by enterprises with high-intensity materials. Work in the jenan area also requires targeted measures such as wind protection and corrosion protection, taking into account local climatic characteristics. It is recommended that the owner select a construction team with similar engineering experience to ensure that both the quality and the efficiency of the work are met。
