The storage of idle steel supports should follow the principles of "moisture resistance, damage prevention, deformation prevention, and easy management" to avoid corrosion, deformation, or functional failure caused by improper storage. The specific requirements are as follows:
1、 Selection and preparation of storage site
Site environment
Prioritize choosing indoor dry and ventilated warehouses; If outdoor storage is required, a hardened site (concrete or gravel cushion layer) should be set up at least 30cm above the ground to avoid water infiltration on the ground surface.
Outdoor areas need to be equipped with rain shelters (with a roof height of ≥ 3m and a coverage area exceeding the stacking area by more than 1m) to prevent direct erosion by rain and snow; Keep away from corrosive substances (such as paint and chemicals) storage areas and avoid contact with acidic and alkaline media.
Site Planning
Divide into independent storage areas, separate from other building materials such as wood and steel bars, and set up warning signs (such as "Steel support stacking area, do not press heavily").
Reserve a passage of ≥ 1.5m around the site for easy lifting, handling, and inspection. Draw stacking boundaries on the ground to avoid dumping caused by random stacking.
2、 Stacking method and load control
Classified stacking
They shall be stacked separately according to the specification (length, section size) and type (upright, cross bar, slant support, connectors). Steel supports of the same specification shall be "stacked in layers". Each layer shall be separated by a wood pad (thickness ≥ 5cm, width ≥ 10cm). The wood pad shall be aligned up and down to avoid deformation caused by uneven force.
Connectors (such as fasteners, bolts, and pins) should be packed in moisture-proof wooden boxes or iron drums, classified and labeled with models to prevent loss or corrosion.
Stacking height and stability
The stacking height of equal length rods such as upright and horizontal bars should be ≤ 2m (about 10-15 pieces in a bundle), and triangular blocks or lateral supports should be set at the bottom to prevent rolling; Special shaped parts such as slant support shall be placed separately and vertically, and the bottom shall be fixed on the support to avoid toppling.
When stacking, the total load should not exceed the ground bearing capacity (hardened ground ≥ 5kN/m ²), and it is strictly prohibited to stack other heavy objects above the stacking area.
3、 Moisture and rust prevention treatment
pretreatment
Thoroughly clean the surface stains and floating rust before storage. For steel supports without anti-corrosion coatings or with damaged coatings, apply a layer of anti rust paint (dry film thickness ≥ 60 μ m) and dry them before storage.
Apply lubricating grease (such as Vaseline) to the connecting parts (such as bolt holes and socket interfaces) to prevent rusting; Fasteners and other small components can be galvanized or soaked in engine oil (sealed and stored).
Moisture prevention measures
When stacking outdoors, plastic film (thickness ≥ 0.1mm) should be laid at the bottom to isolate moisture from the ground, and waterproof canvas should be covered at the top (with edges hanging down to the ground and compacted) to form a closed moisture-proof layer.
Place moisture absorbing agents (such as silicone and quicklime) in the warehouse, regularly check the humidity (relative humidity ≤ 70%), and install dehumidifiers in humid areas.
4、 Anti deformation and loss control
Avoid deformation under stress
When stacking long poles, the distance between support points should be ≤ 6m (if a 6m long pole needs to have 2 support points located at 1/3 of both ends) to prevent bending due to its own weight (deflection ≤ L/300, where L is the length of the pole).
It is strictly prohibited to stack other heavy objects (such as steel pipes and templates) on steel supports to avoid deformation of the section caused by local compression; Special lifting equipment (such as slings and clamps) should be used during lifting and handling, and direct dragging or impact is prohibited.
Regular inspection and maintenance
Check the stability of the stacking every week and promptly organize and reinforce any tilted or loose stacking; Check the rust situation every month, and immediately sand and apply anti rust paint if local rust is found.
Steel supports that have been stored for a long time (more than 6 months) should be flipped every 3 months to avoid long-term compression and deformation of the same part; Thoroughly inspect the integrity of the moisture-proof layer before and after the rainy season, and repair any damaged areas.
5、 Ledger management and identification
Establish a ledger
Record the specifications, quantity, storage time, and status of steel supports (such as new and repaired parts), conduct regular inventory checks, and ensure that the accounts match the goods.
For steel supports with damage (such as bending, weld cracking), mark them separately as "to be repaired" or "scrapped", and prohibit mixing them with intact parts.
Clear identification
Hang signs next to each pile of steel supports, indicating specifications, quantity, and storage date; For key components such as adjustable top supports and flanges, label them with prompts such as "precision components, handle with care".
Through the above measures, it can be ensured that idle steel supports remain in good condition during storage, and do not require large-scale repairs when reused, directly meeting the requirements for use and extending the overall service life.
