The edge guardrail is a foundation pit excavated according to the construction direction of the foundation, the elevation of the foundation and the plane size of the foundation. It is mainly used for laying foundation. Generally, people in the industry know more about the retaining structure of the foundation pit, which is sometimes interpreted as: the construction foundation pit connected with the column has maintenance effect, about 1.2m high and 2m long, with warning signs.

黃色黑色或紅色白色警示色，基坑邊護欄，您需要知道基坑邊緣護欄的施工方法：① 現場澆筑基礎，人工開挖基坑。對于不能人工開挖的巖石部分，請用風鎬或氣槍鉆淺孔，輔以弱爆破，開挖上部土坑壁和邊坡，下部巖坑壁垂直。

Yellow, black or red, white warning color, guardrail at the edge of foundation pit. You need to know the construction method of guardrail at the edge of foundation pit: ① cast foundation on site and excavate foundation pit manually. For the rock part that cannot be excavated manually, please drill shallow holes with air pick or air gun, supplemented by weak blasting, excavate the upper soil pit wall and slope, and the lower rock pit wall is vertical.

基坑開挖的坡度取決于地基，基坑的尺寸應符合基坑的輪廓。在安裝混凝土基礎之前，及時檢查基坑的尺寸、平面方向、平面度和密實度，然后繼續進行基礎施工。基礎檢查：在注漿基礎混凝土之前，檢查基坑的隱蔽工程。

The slope of foundation pit excavation depends on the foundation, and the size of foundation pit shall conform to the outline of foundation pit. Before installing the concrete foundation, check the size, plane direction, flatness and compactness of the foundation pit in time, and then continue the foundation construction. Foundation inspection: check the concealed works of foundation pit before grouting foundation concrete.

臨邊護欄

Edge guardrail

有五種邊緣環境：一是開挖深度超過2m的溝、坑、溝周圍；二是屋面、框架、結構樓板周圍無外腳手架；三是周邊的格柵、腳手架、龍門架、外部電梯和建筑地面通道、上下跑道和斜側道路；四是圍繞未安裝的圍欄、欄桿陽臺和材料平臺，五是在施工樓梯側。

There are five kinds of edge environments: one is around ditches, pits and ditches with excavation depth of more than 2m; Second, there is no external scaffold around the roof, frame and structural floor; The third is the surrounding grid, scaffold, gantry, external elevator and building ground passage, upper and lower runways and inclined roads; The fourth is around the fence, railing, balcony and material platform not installed, and the fifth is on the side of the construction stairs.

臨邊護欄由網柵和立管柵組成，也可分為預埋柱和無預埋柱。在施工過程中，應嚴格按照邊欄的規范操作進行施工。在基坑圍護的底部設置了黃色的黑色或紅色白色的踢腳線，噴灑不投擲和不交叉的警告字，提醒施工人員在危險區域小心，不要粗心大意。

The edge guardrail is composed of mesh grid and riser grid, and can also be divided into embedded column and non embedded column. During construction, the construction shall be carried out in strict accordance with the standard operation of the sidebar. Yellow black or red white skirting lines are set at the bottom of the foundation pit enclosure, and the warning words of no throwing and no crossing are sprayed to remind the construction personnel to be careful in the dangerous area and not to be careless.