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.

黄色黑色或红色白色警示色，基坑边护栏，您需要知道基坑边缘护栏的施工方法：① 现场浇筑基础，人工开挖基坑。对于不能人工开挖的岩石部分，请用风镐或气枪钻浅孔，辅以弱爆破，开挖上部土坑壁和边坡，下部岩坑壁垂直。

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.

基坑开挖的坡度取决于地基，基坑的尺寸应符合基坑的轮廓。在安装混凝土基础之前，及时检查基坑的尺寸、平面方向、平面度和密实度，然后继续进行基础施工。基础检查：在注浆基础混凝土之前，检查基坑的隐蔽工程。

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.

临边护栏

Edge guardrail

有五种边缘环境：一是开挖深度超过2m的沟、坑、沟周围；二是屋面、框架、结构楼板周围无外脚手架；三是周边的格栅、脚手架、龙门架、外部电梯和建筑地面通道、上下跑道和斜侧道路；四是围绕未安装的围栏、栏杆阳台和材料平台，五是在施工楼梯侧。

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.

临边护栏由网栅和立管栅组成，也可分为预埋柱和无预埋柱。在施工过程中，应严格按照边栏的规范操作进行施工。在基坑围护的底部设置了黄色的黑色或红色白色的踢脚线，喷洒不投掷和不交叉的警告字，提醒施工人员在危险区域小心，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.