In modern construction engineering, the grid structure is widely used due to its unique advantages, and the grid strip or block installation method is an important construction method that provides efficient and high-quality solutions for the construction of grid structures.

Definition and Principle
The installation method of dividing the grid into strips or blocks is to divide the grid into several strip elements with a width of one to three grids and a length of short spans along the long span direction, or into rectangular or square block elements along the longitudinal and transverse directions. After assembling these units on the ground, use cranes and other equipment to lift them to the high-altitude design position for placement, and finally assemble them into a whole 123.
Construction process
Unit division: Divided based on the load capacity of the crane and the characteristics of the grid structure. For a square pyramid grid structure, the grid units can be tightly pressed against each other, and the lower chord double angle steel can be separated into two units; For inclined quadrangular pyramid grid structures, the elements can be tightly connected to each other, and the upper chord between the elements can be connected using split installation nodes.
Ground assembly: On a flat and solid ground assembly platform, according to design requirements and construction specifications, the members and nodes of the grid are accurately assembled to form strip or block units.
Lifting in place: Single machine internal lifting or double machine external lifting methods are used to lift the segmented or block units to the design position. Adjustable columns and steel top supports are often installed in the middle and lower parts of the span to adjust the deflection of the grid structure.
High altitude assembly: Connect the various units that have been lifted into place to complete the overall assembly of the grid structure. It is necessary to ensure the accuracy and quality of the connecting nodes to form a stable overall structure of the grid.
Advantages and Characteristics
Construction safety is guaranteed: Most of the assembly work is carried out on the ground, significantly reducing the amount of high-altitude operations and lowering the risks faced by construction personnel, providing strong guarantees for construction safety.
Construction cost reduction: The unit weight after being divided into strips or blocks is relatively light, and can be lifted using existing lifting equipment without the need for large, professional lifting machinery, effectively reducing construction costs.
Construction efficiency improvement: Ground assembly can be carried out in parallel with other construction projects, without interference between each process, and can achieve three-dimensional cross operation, thereby shortening the overall construction period.
Convenient quality control: The ground assembly environment is relatively stable, making it easy for construction personnel to operate and inspect the quality, which is conducive to ensuring the assembly accuracy and welding quality of the grid structure, and improving the overall project quality.
Scope of application
The installation method of dividing the grid into strips or blocks is suitable for grid structures with high stiffness, such as upright square pyramids and upright empty square pyramids. At the same time, this method can also achieve good construction results for rectangular planar grids with large widths, triangular and trapezoidal planar grids with large spans.
Key points of construction
Unit stiffness guarantee: The segmented or block units should be geometrically invariant systems with sufficient stiffness. Upright grid structures generally do not require reinforcement, while inclined grid structures usually require a large number of temporary reinforcement rods after segmentation, while block structures only need to be added around the perimeter.
Dimensional accuracy control: The dimensions of the block like units must be accurate, and measures such as pre assembly and nesting should be taken to ensure that the high-altitude assembly nodes match and reduce accumulated errors.
Deflection adjustment: The deflection of the strip-shaped unit when lifted into place is greater than that of the overall grid structure, and the closure needs to be adjusted by lifting it up with a support frame; After the production of block unit ground, the high-altitude support conditions should be simulated, and the deflection should be observed and adjusted.
In short, the installation method of grid structure in sections or blocks has an important position and wide application prospects in the field of construction due to its many advantages, providing reliable and efficient construction methods for various types of grid structures and effectively promoting the development of the construction industry.