What are the key points to pay attention to in the construction process of grid structure?

All kinds of steel pipe scaffolding erected for grid construction must prepare a special safety construction organization design and carry out special design calculations, and the relevant provisions should be complied with in the operation.

Set up a mobile scaffold operating platform, the scaffold pole should be welded on the channel steel, and the longitudinal and transverse sweeping rods must be set at a distance of 200mm from the channel steel surface. Scaffolding ramps and rest platforms, perimeter protection of the working layer and scaffolding board laying shall comply with relevant regulations.

Mobile scaffolding must comply with the provisions of the special safety construction organization design when dragging.

Each time the scaffold is towed, there should be a special person to command, a special person to observe, first try to drag 1 2m, check the deformation of the shelf, confirm that there is no deformation before it can be officially towed. After dragging and positioning, the deformation and inertia of the scaffold should be fully inspected to confirm that there is no deformation before it can be used.

The number of operators on the scaffolding platform should be minimized, and no number of people should be concentrated in one span of the scaffolding during the operation.

Workers who install steel bolt balls and rods on the grid body should use safety belts, and the safety belts should be hung on a firm structure, and the installers must be equipped with tool bags and tool hooks.

When the grid is positioned, dragged or jacked, all equipment should be fixed firmly, a firm operating platform should be set up in the operating position, and walking handrails or protective railings should be set. When dragging or jacking the operation, no one shall stay on the grid.

Summary. Hello, dear, the construction of the grid structure should pay attention to: 1. The construction of the grid structure construction period is in the rainy season, and the fireproof coating is not dried in the next process due to the rush in the local area, which makes the water content of the fireproof paint exceed the standard, and the adhesion of the intermediate paint and topcoat cannot meet the requirements of the product and design, and the phenomenon of hollowing and paint stripping occurs in the later stage.

2. If there is more rain in the area of the grid structure, the rainwater is more acidic, and the roof is aging and damaged, acid rain erosion and sun exposure and rain will aggravate the problems of layering, hollowing and paint stripping of the top coat and fireproof paint of the grid structure.

3. During the period of putting into use, not enough attention was paid to the maintenance work, and effective measures were not studied and taken to prevent the large-scale hollowing and falling off of the topcoat and fireproof paint in the early stage of hollowing and stripping of the grid structure.

What problems should be paid attention to in the construction of grid structure?

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Hello, dear, the construction of the grid structure should pay attention to: 1. The construction of the grid structure during the construction of the grid structure is in the rainy season, and the local area is in a hurry to catch up with the construction period, and the fireproof coating is not dried to carry out the next process, so that the moisture content of the fireproof paint exceeds the standard, and the adhesion of the intermediate paint and the topcoat cannot meet the requirements of the product and design, and the phenomenon of hollowing and paint stripping occurs in the later stage. 2. If there is more rain in the area of the grid structure, the acidity of the rainwater is stronger, and the roof is aging and damaged, acid rain erosion and sun and rain will aggravate the problems of topcoat and fireproof paint of the grid structure, hollowing and paint stripping.

3. Insufficient attention was paid to maintenance during the period of use, and effective measures were not studied and effective measures were taken to prevent the large-scale hollowing and falling off of the topcoat and fireproof paint in the early stage of hollowing and stripping of the grid structure.

Article 1. The allowable deviation of the geometric dimensions of the prefabricated reinforced concrete slab and the concrete quality standard shall comply with the relevant provisions of the current national standard "Code for Construction and Acceptance of Concrete Structure Engineering" GBJ204.

Article 2. The jointed concrete should be mixed with micro-expanded cement and poured continuously.

When the concrete strength of Jianxun grout reaches more than 75% of the concrete strength grade, the assembly support can be removed. The concrete quality standards are the same as those specified in Article 1 of these Regulations.

Article 3. The allowable deviation of the steel web and lower chord of the combined grid structure, the allowable deviation of the geometric dimensions of the assembly and the quality requirements of the weld shall comply with the provisions of Section II of this chapter.

Article 4. The installation method of the combined grid structure can adopt the high-altitude bulk method, the overall lifting method, the overall jacking method, and the slitting (blocking) method and the high-altitude slip method.

When the composite grid structure is divided into strip (block) units, the bearing capacity and stiffness must be checked separately, and the deflection of the unit body should not be greater than the deflection value after the formation of the overall structure.

Answer: The installation method and scope of application of the grid:

1) High-altitude bulk method: suitable for various types of grid joints connected by bolts, and it is advisable to adopt the cantilever construction method with fewer supports;

2) Slitting or block installation method: suitable for grids with small changes in stiffness and stress conditions after segmentation, such as two-way orthogonal quadrangular pyramids, forward evacuation quadrangular pyramids and other grids; The size of the slits or blocks should be based on the lifting capacity;

3) High-altitude slip method: suitable for grid frames such as orthogonal quadrangular cone, positive evacuation quadrangular pyramid, and two-way orthogonal quadrangular quadrangular pyramid. When slipping, the slip unit should be guaranteed to become a geometrically invariant system;

4) Overall hoisting method: suitable for various types of grids, can be translated or rotated in place at high altitude when hoisting;

5) Overall lifting method: suitable for peripheral support and multi-point support grid, can be used for plate lifting, hydraulic jacks and other small tools for construction;

6) Overall jacking method: suitable for multi-point support grid with fewer fulcrums;

7) When the installation method of hoisting or lifting and jacking is adopted, the following factors should be considered in the selection of the position and number of lifting points:

1) It should be close to the stress condition of the grid structure when it is used;

2) The maximum reaction force of the lifting point should not be greater than the load capacity of the lifting equipment;

3) The load of each lifting equipment should be close.