Container House Hoisting Process

The hoisting process of container houses must adhere to strict operational standards and safety guidelines, with core steps including pre-hoisting preparation, selection of lifting points and configuration of lifting equipment, synchronized lifting and lowering, and on-site monitoring and adjustments.

Pre-hoisting Preparation

The site must be hardened to ensure the ground bearing capacity meets requirements. For example, using 200mm-thick C30 concrete for hardening, the ground bearing capacity should be ≥200kPa. Additionally, the dimensions, weight, and stacking height of the containers must be verified. A 20-foot standard container weighs approximately 2.3 tons, while a 40-foot high-cube container weighs about 4.8 tons, with a maximum stacking height usually not exceeding three layers. Furthermore, the integrity of lifting equipment such as steel wire ropes, shackles, and chain hoists must be inspected to ensure their rated loads meet requirements, such as a 6×37+FC-Φ22mm steel wire rope requiring a breaking force of 289kN.

Selection of Lifting Points and Configuration of Lifting Equipment

Container bottoms typically have 4-6 lifting points, requiring the use of steel wire ropes or nylon slings with sufficient bearing capacity. For example, 20/40-foot containers can use ISO1161 standard lifting equipment with a rated load of 30t, equipped with synchronized twist-lock control. Lifting points must be located at structural nodes to avoid local stress concentration and deformation. For foldable containers, support rods must be placed after the main frame is extended, and the walls must be secured with tightening screws.

Synchronized Lifting and Lowering

During lifting, all lifting points must be synchronized to prevent unilateral tilting. For example, when using a 25t truck crane, the center of gravity must be adjusted through the outrigger span (longitudinal × transverse dimensions of 5.1m × 6.3m), and the minimum working radius (e.g., 2.5m) must be maintained to enhance stability. When lowering, the descent must be slow, and the fit between the bottom beam and foundation pads must be immediately checked, with deviations controlled within ±25mm. For high-rise stacking, chain hoists must be used for fine adjustments to ensure precise connection of corner fittings between upper and lower containers.

On-site Monitoring and Adjustments

During hoisting, wind speed must be continuously monitored, and operations must be suspended when wind forces exceed Level 5 (approximately 8.0-10.7m/s). Additionally, tools such as total stations and level gauges must be used to verify the alignment and elevation of container positions, ensuring vertical deviations ≤10mm. For modular buildings, welding or bolt fastening at拼接处 (joints) must be performed immediately after hoisting, and the pre-embedded positions of water and electricity pipelines must be checked to avoid rework.