Construction technology of spherical grid structure in steel structure building?

The solder ball is installed on the ground and closed at high altitude. Construction technology: pay-off inspection → plane grid installation → three-dimensional grid installation → integral hoisting installation of winding grid → grid high-altitude closure → grid acceptance.

A, pay-off, line inspection

1. Column top setting-out and line inspection: mark the axis and elevation, check the column top displacement, and re-verify the provided position, size and elevation before the grid installation unit can formally install the grid support point.

2. The ground installation environment of the grid should be laid flat, and each fulcrum of the grid ball should be paid off, indicating the position and the number of balls.

3. Brick piers are each fulcrum of the grid ball. The pier material can be a steel pipe support point, or a brick pier with a small circular tube as a grid bottom chord ball bearing.

4. Mark the elevation of each fulcrum. If the grid has bulging requirements, it should be reflected in each support point, and the bulging requirements of the grid should be completed with supporting steel pipes with different heights.

Second, the steel grid plane installation

1. ball release: put the qualified solder balls into the installation node according to the specifications and quantity, and adjust the stress direction and position of the solder balls. Generally, the circumferential weld of the horizontal center line of the ball is placed in the equatorial direction. The rib is in the upper half of the lower chord ball.

2. Laying rebar: Before arranging the prepared rebar according to the specified specifications, check the specifications and dimensions of rebar and the gap between the groove and the weld. Put the stick between the two balls, adjust the gap and fix it.

3. The plane grid should be assembled from the center line and gradually spread around. First, a closed square grid should be formed. After controlling the size, we should constantly assemble and expand the surrounding grids. Attention should be paid to controlling the cumulative error, and the general grid should have negative tolerance.

4. Plane grid welding. Before welding, the welding process and network connection sequence should be compiled to prevent the plane grid from deforming.

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