I. Project Overview
This is a spiral steel silo project built for Shouguang Lifei Concrete Admixture (Group) Co. Ltd. The project contains 13 cement storage tanks in total, three of them are 16m wide and 18m high, used for homogenized cement storage; the rest ten tanks are 9m wide and 16m high for raw cement storage.
II. Basis & Content Of Design
The design of the project is mainly based on the technical requirements of the construction party and the layout plan of the silos, following the below specifications:
Load Code for the Design of Building Structures (GB50009-2010), Code for Design of Building Foundation (GB50007-2011), Code for Design of Reinforced Concrete Silos (GBJ50077-2003), Code for Design of Concrete Structures (GB50010-2010), Technical Code for Ground Treatment of Buildings (JGJ79-2012), Code for Seismic Design of Buildings (GB 50011-2010).
Design content: silo foundation
III. Construction
1. Silo location: the construction party will make reasonable location arrangements for the silos according to the factory floor plan, technology requirements, and drawings.
2. Elevation: outdoor designed elevation is used as the specification m ±0.000 for the project
3. Detailed treatment: the construction party shall make its own treatments of internal and external painting to coordinate the other buildings in the factory. Outside all structural layers, a 1:2 cement mortar surface with 20 in thickness should be made.
cement silos project
IV. Structure
1. Civil construction unit and construction party shall organize construction and acceptance according to Code for Acceptance of Construction Quality of Building Foundation （GB50202-2002）and Code for Acceptance of Construction Quality of Concrete Structures（GB50204-2002）, especially including construction quality and inspection of concealed works.
2. Cover to reinforcement: 35mm thick for column, beam, and base plate
3. Steel connection:
Welding connection or mechanical connection should be preferentially used to steel connection. When welding, flash butt welding; or electric arc welding should be adopted, which can guarantee that the seam length of double-sided welding is 5d and the numbers and locations of joints are staggered to meet the standard requirements.
4. When construction, special attention to the elevation, quantity, and location of various embedded parts of the silo bottom with vibration compacting must be paid to.
5. Before slope filling inside the silos and water flashing & solid filling outside the silos, internal and external walls shall be painted asphalt twice in the height range of slope filling. Other methods shall refer to Slope Filling Instruction.
6. Material:
Concrete grade: cushion layer C15, the others C30
Reinforced steels: I Grade (HPB300 Reinforced steel)
III Grade (HRB400 Reinforced steel)
7. Seismic fortification intensity: Ms7.0 earthquake; Building safety grade: 2 Grade.
V. Foundation Construction
According to the geological survey report of the construction party, the project adopts φ600 bored pile to process. Details can be seen in structure 12.
VI. Precautions
1. In order to ensure normal and safe use of the silos, settlement observation must be made in the three stages of construction, loading test, and normal use according to relevant state codes. The settlement differences between the silos should be paid more attention to. Settlement observation records shall deliver to the design unit.
2 In the process of loading and formal use of the silos, the loading must be stopped as any abnormal situation occurs and the settlement observation shall be also recorded. The emergency measures should be taken properly, which shall be informed to the relevant unit.
3. Settlement observation records shall be sent to the design unit.
