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Foundation pit guardrails are often used around the foundation pit of construction sites, which are prone to fall on both sides of the high-altitude aisle. In the south, people will be called stereotyped protective railings. There are three main structural forms: 1. Vertical pipe foundation pit, metal mesh is made of 20mm square steel welded, and fitted with 50mm square steel column; 2. Mesh foundation pit, metal mesh is made of Q235 low carbon Wire welding, mesh hole is 50mm or 60mm square hole; 3. Steel mesh pit, metal mesh surface is punched into holes, the mesh is kept between 55mm * 65mm, should not be too large. The metal mesh will be welded with 20mm*30mm rectangular square steel as the frame to form the overall protective mesh. The columns are 50mm square steel.

The fixing method of the column is also divided into three types: pre-buried, flanged and mobile. The pre-buried type is relatively simple to stretch the overall height of the column, leaving the part buried below the ground; the flange type is welded with 150mm*150mm*3mm perforated steel plate at the bottom of the column for cement or Other hard ground fixed; movable type is to change the flange to the horizontal square steel of the same size as the square steel, the length is between 250mm~350mm, and it can be moved or temporarily protected as needed.