I. Core use
Lightweight thin-walled sand and gravel spiral
silo is a lightweight storage equipment designed for the storage of construction sand and gravel, aggregates (crushed stone, mechanism sand, river sand, etc.), applicable to:
Concrete mixing plant: realising partition storage and automated feeding silo for sand and stone raw materials, matching the continuous operation demand of mixing production line;
Temporary storage for infrastructure projects: sand and gravel from highway/railway construction sites are transferred and stored in industrial cement storage silos to meet the short-cycle (3-12 months) high-intensity material turnover;
Aggregate processing in mines: finished materials after crushing and screening in mines are temporarily stored in cement silos to support large-scale centralised warehousing in open-air environments;
Commercial mixing station / precast plant: standardised storage of C30-C60 concrete aggregates, ensuring stability of material gradation and quality traceability.
Core functions and technical advantages
Lightweight structure design
Thin-walled spiral forming process: 2-4mm hot-dip galvanized steel (galvanized layer ≥85μm) is used, which is formed in one piece by spiral crimping and cold bending technology. The self-weight of galvanized
steel silo is 30% lower than that of traditional steel silo, which greatly reduces the foundation load-bearing requirements (suitable for ordinary concrete foundation with bearing capacity ≥150kPa).
High-strength load-bearing performance: the capacity of slag powder silo is 500-10,000 tonnes, and the circumferential tensile strength of the silo wall is ≥235MPa, which can withstand the lateral pressure generated by the accumulation of sand and gravel (design load: 30-80kPa), and meets the requirements of the ‘Technical Specification for the Storage of Sand for Construction’ (GB/T 24974).
Rapid assembly construction
Modular bolting: Steel silo components are prefabricated in the factory and assembled on-site with high-strength bolts, allowing installation of a 5,000-tonne silo in 72 hours, which is 50% shorter than traditional welded silos and is particularly suited to infrastructure projects with tight construction schedules.
Relocatable and reusable: the loss rate of components after dismantling is ≤5%, and the efficiency of off-site reconstruction is increased by 40%, which reduces the cost of the whole cycle of the project.
Intelligent storage system
Real-time monitoring of material level: integrated hammer level meter or radar sensor, remotely displaying the storage volume of materials in the silo (accuracy ±2%), and docking with the ERP system of the mixing plant to achieve automatic replenishment reminder.
Dust suppression design: the top of the silo is equipped with a breathing valve + dust net (mesh number ≥ 80), the discharge port is equipped with rubber sealing curtains, dust emissions ≤ 10mg/m³, in line with the ‘Comprehensive Emission Standards for Air Pollutants’ (GB 16297).
Anti-caking unloading device: cone bucket angle 45°-60° adjustable, the inner wall with polyethylene wear-resistant liner, with a
warehouse wall vibrator, to ensure that the sand and gravel unloading flow rate of ≥ 15t / h (particle size ≤ 50mm).
Environmental adaptability design
Weather-resistant and anti-corrosion treatment: the outer wall is coated with acrylic polyurethane top coating (salt spray resistance ≥ 1,000 hours), adapting to the complex environment of high humidity along the coast and sandy winds and sandy winds in Northwest China, with a service life of more than 15 years.
Wind and seismic resistance: it can withstand grade 12 typhoon (design wind pressure ≤1.5kPa) and grade 8 earthquake (seismic intensity ≥0.3g), which is in line with the requirements of Code for the Design of Steel Structures (GB 50017).
Precautions for use
Foundation pretreatment
It is necessary to adopt reinforced concrete raft foundation with flatness error ≤3mm/m, and no settlement is confirmed by load test (pile load ≥1.5 times of design load) before installation.
Load control
Strictly prohibit exceeding the design capacity (subject to the label of the nameplate of the silo), the height of sand and gravel stacking shall not exceed 90% of the height of the silo, and avoid partial loading (the difference in the height of the materials on one side is ≤500mm).
Regular maintenance
Anti-corrosion inspection: repair the damaged coating on the silo wall once a year (the whole coating should be recoated when the local corrosion area is >5%);
Bolt fastening: check the torque of connecting bolts every quarter (M20 bolts should reach 260N・m) to prevent loosening caused by vibration;
Equipment calibration: calibrate the material level meter, vibrator and other supporting equipment every six months to ensure the reliable operation of the automation system.
Extreme weather response
After heavy rain or snowstorms, the roof of the silo must be cleared of water or snow (manual intervention is required when the thickness of snow is >300mm) to avoid overloading of local loads;
In high temperature areas (≥40℃), it is necessary to check the ventilation inside the silo to prevent sand and gravel from caking at high temperature (it is recommended to configure the silo roof sunshade).
Unloading operation specification
When unloading, it is necessary to open several unloading ports symmetrically, and it is forbidden to concentrate unloading at a single point;
The ultra-coarse aggregate with particle size >80mm should be screened in advance to avoid blocking the discharge port.
Industry standard
This product complies with the following national standards and industry norms:
Technical specification for steel plate silo (GB 50322)
Management Standard for Warehousing of Construction Materials (GB/T 51071)
Standard for Quality and Inspection Methods of Sand and Gravel Aggregate for Concrete (JGJ 52)
Through lightweight design, rapid construction and intelligent support, the lightweight thin-walled sand and gravel spiral silo provides an ‘efficient, economical and environmentally friendly’ systematic solution for construction aggregate storage, which is especially suitable for large-scale infrastructure projects and concrete producers that are sensitive to schedule and cost.
Henan Bocheng International trade Co.，LTD
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