Find out the demolition scheme of supporting beam for foundation pit support.

The underground second floor wall has been partially completed. After the construction of the underground second floor roof is completed, the horizontal support beam (elevation-1.7m) in Area A will hinder the construction of the underground second floor wall. Therefore, the replacement of the support and the removal of the support beam must be considered when pouring the underground second floor roof.

The west, north and east axes of the foundation pit of building 0 1 adopt variable brace structure; Support replacement structure should be built in the south of (1-n) axis.

The length of the foundation pit from north to south is about 13 1m, and the width from east to west is about 86m.

A truss reinforced concrete horizontal support is set below the elevation of-1.7m. The supporting piles around the foundation pit are connected into a whole by the cover beam spanning the foundation pit through the splayed connecting beam of the inner column of the foundation pit.

Support replacement method

The underground two-story roof beam extending to the slope protection piles is used as the supporting replacement structure, and the width of supporting replacement is more than 3 times the pile spacing, and the supporting replacement block includes at least 3 supporting piles.