Case Analysis of Steel Structure Space Frame Engineering for Shipyard Roof Expansion Part 1

General description of the project:

1. Project name: Steel space frame structure for roof extension of shipyard workshop
2. Work content: 5F and 6F roof steel space frame engineering of shipyard ship workshop
3. Structural form: bolt ball joint space frame with main projection grid size of 3m×3m; lower support type, multi-support point, square pyramid space frame; four skylight spaces of 9m×108m=972 m2 above the space frame frame；
4. Building area: 264m×84m=22176㎡; 27m×60m=1620㎡; ∑=23796㎡; the space frame area of skylight is about 3888㎡;
5. Design unit: SAFS Steel Structure Engineering Co., Ltd.
6. Construction unit: SAFS Steel Structure Engineering Co., Ltd.

Project management goals and deployment:

Duration: The total construction duration is 74 calendar days.

Safety: The frequency of injury in construction safety production is less than 0.1‰. ; Eliminate fatal accidents; Eliminate major accidents such as fire, traffic, equipment, and pipelines.

Quality: Project quality, one-time acceptance.

Civilization: Standardize on-site management to ensure that civilized construction meets standards, and cooperate with general contractors to create civilized demonstration projects.

Selection of construction method, construction sequence and construction flow

According to the structural design of the space frame, construction characteristics, on-site construction conditions and the resource input of our company, etc., and through various optimization schemes, it was decided to use the crane beam (5F) of the newly built workshop and two 20-ton cranes (6F), A 15-meter-wide movable working platform is set up on it, and the movable working platform is used to directly assemble the construction method at high altitude. Install it to both ends (G-axis and J-axis), and set up an independent bracket in advance at the No. 14 position of the H-axis as a temporary support point during the installation process.

Construction site layout

1. The eye-catching position of the entrance and exit of the construction site shall be hung according to the relevant regulations with the list of management personnel and the post responsibility system.
2. Various facilities, building materials, equipment, on-site products, semi-finished products, accessories and other materials on the construction site shall be stored in the area delineated by the general contracting construction plane. Ensure that the main passage on the construction site has sufficient width and smoothness.
3. The construction area, office area (temporary office uses containers), and living area (the workers’ accommodation is settled by renting nearby) on the construction site shall be set up separately, and zoning management shall be implemented, which shall comply with the standardized management of environment, sanitation, fire safety and safe and civilized construction relevant regulations.

labor options

According to the construction characteristics of the space frame project, in the arrangement of the labor force, break the conventional arrangement mode, transfer the company’s strong labor force to meet the requirements of the construction period and quality, and arrange the labor force reasonably according to the actual situation of the site, organize the construction scientifically, and organize the construction in a scientific way. Through the whole process of dynamic management, the work tasks are successfully completed within the scheduled working days.

Rental and assembly of steel bridges

The movable steel bridge (70 tons of Bailey sheet) used in the 5F workshop is all assembled, dismantled and managed by China Steel Structure.

Selection of main construction machinery

The 6F workshop borrows two 20-ton cranes from the newly built workshop to build the steel pipe work platform. When assembling the steel bridge, two 50-ton trucks are used to hoist the whole steel bridge, and two 8-ton trucks are used to hoist the steel bridge on the ground. When installing the space frame, use two 16-ton truck cranes for vertical transportation of space frame parts.

Construction water and electricity requirements

Construction water: The water consumption of this project is not large, and the water supply system arranged when the original factory building was newly built can be used;

Construction electricity: The construction unit is required to provide 90KVA of electricity to meet the needs of peak construction electricity;

Calculation of total electricity consumption for on-site construction:

The total electric power of the motor P1=55.5KW

The total electric power of electric welding machine P2=46.8KW

Lighting and office electricity limit P3=3KW

Total electricity consumption: P total=1.05×(K1×P1/COSθ+K2×P2+K3×P3)

The above formula K1 takes 0.7; COSθ takes 0.75; K2 takes 0.7; K3 takes 0.8;

Then P total=1.05×(0.7×55.5/0.75+0.7×46.8+0.8×3)=91.3KW