High-Density Automated Warehouse Rack Structural Design Specification

High-density automated warehouse racks serve as the core carrier of modern intelligent warehousing systems. By integrating automated equipment such as stackers, shuttles and AGVs, they boost space utilization and realize unmanned operation processes. Its structural design needs to balance safety, functionality and compatibility, and comply with the following key specifications:

Ⅰ. Specifications for Structural Load and Material Selection

1. Load Calculation

Three types of loads shall be comprehensively considered:

• Static load: dead weight of goods, self-weight of rack structure and weight of auxiliary facilities such as guide rails and sensors;

• Dynamic load: impact and vibration load generated during the operation of stackers and shuttles, amplified by a coefficient of 1.2 to 1.5 times the rated speed of equipment;

• Special load: seismic load, calculated in accordance with GB 50011 Code for Seismic Design of Buildings based on the seismic fortification intensity of the warehouse location.

A safety margin of 15% to 20% shall be reserved for the rated load of the rack to avoid structural deformation caused by overload.

2. Material Standards

Q235B or Q345B carbon structural steel complying with GB/T 700 and GB/T 1591 is preferred for the main structure, with yield strength not lower than 235MPa for Q235B and 345MPa for Q345B. Welding materials shall be matched with base metal, for example, E43 series welding rods corresponding to Q235B, and welding procedures shall conform to GB/T 12467.3 Requirements for Welding Quality. High-strength bolts of Grade 8.8 and above complying with GB/T 1228 shall be adopted for bolt connection, and the pre-tightening force shall meet design requirements.

Ⅱ. Specifications for High-Density Layout and Dimension Adaptation

1. Standardization of Storage Units

The rack dimensions shall adapt to standardized specifications of pallets or material boxes, such as 1200×1000mm and 1100×1100mm pallets. A safety clearance of 100 to 150mm shall be reserved for the layer spacing above the goods height. The row spacing and aisle width shall match the operation demands of automated equipment:

• Stacker aisle width: designed as the extension width of stacker forks plus a clearance of 50 to 80mm on both sides;

• Shuttle passage width: 50 to 100mm wider than the pallet width to ensure smooth passage of shuttles.

2. Dense Storage Layout

For dense structures such as double-depth racks and shuttle racks, the number of rows is generally controlled within 10 rows to prevent reduction in access efficiency of deep-layer goods. Fire passages with a width of no less than 1.2 meters and equipment maintenance space shall be reserved in rack arrangement, complying with GB 50016 Code on Fire Protection Design of Buildings.

Ⅲ. Specifications for Structural Stability and Safety Protection

1. Stability Requirements

• Anti-overturning coefficient shall be no less than 1.5 calculated under unfavorable load combinations;

• Anti-sliding coefficient shall be no less than 1.2, ensuring the friction between foundation and ground exceeds horizontal thrust;

• Slenderness ratio of upright columns shall not exceed 150 in accordance with GB 50017 Standard for Design of Steel Structures to avoid compression buckling;

• Deflection of beams shall not exceed L/200 where L refers to the beam span, so as to guarantee stable placement of goods.

2. Safety Protection Design

• Anti-collision protection: polyurethane or rubber anti-collision strips with a thickness of no less than 50mm shall be installed on upright columns on both sides of the aisle, and buffer devices shall be arranged in the operation area of stackers;

• Anti-falling measures: baffles of 100 to 150mm in height shall be added at the edge of laminates, and limit blocks shall be set at the bottom of pallets to prevent goods from sliding down;

• Fire protection treatment: the rack surface shall be coated with fireproof paint with a fire resistance limit of no less than 1.5 hours complying with GB 14907, and smoke and temperature sensors shall be installed in dense areas.

Ⅳ. Specifications for Automatic Coordinated Design

1. Installation Accuracy Control

• Verticality deviation of upright columns: no more than 1mm per meter, and total height deviation no more than 10mm;

• Installation accuracy of guide rails: straightness deviation no more than 0.5mm per meter, parallelism deviation no more than 1mm per 5 meters;

• Butt joint error between racks and automated equipment shall not exceed 5mm, ensuring accurate picking and placing of goods by stacker forks.

2. Interface Adaptation

• Reserved mounting positions for sensors such as position detection and goods presence detection shall be arranged on racks, and circuit routing shall avoid equipment operation areas;

• Shuttle racks shall be integrated with track systems, and the connection strength between tracks and rack structures shall meet the load requirements of equipment operation.

Ⅴ. Specifications for Maintenance and Inspection

1. Regular Inspection

• Quarterly inspection: check column deformation, beam deflection, bolt looseness with torque not less than 90% of the design value, and wear of anti-collision strips;

• Annual inspection: comprehensively evaluate the structural state with tools such as level gauges and deflection meters, replace or reinforce components with excessive deformation;

• Record filing: establish rack maintenance account books, keep inspection data and maintenance records with a valid period of no less than 5 years.

2. Maintenance Requirements

• Overweight goods storage is prohibited, and impact on rack structures is not allowed;

• Regularly clean dust and sundries on the rack surface to prevent corrosion;

• Fire-fighting facilities shall be inspected monthly to ensure normal functions.

The design specifications of high-density automated warehouse racks integrate structural mechanics, automation technology and safety standards. Strict implementation of the above requirements can ensure long-term stable operation of the system and provide reliable support for intelligent warehousing. Relevant design shall refer to national standards including GB/T 27924 Design Specification for Automated Storage and Retrieval System Racks to ensure compliance and practicality.