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防护栏的安装事项
1、防护栏宜在路基工程完成后尽早实施；承包人应在施工前制订详细的施工组织设计送监理工程师审批。承包人应根据批准的施工组织设计，按图纸要求及实际地形、地物的情况进行施工放样，定出立柱中心线，进行必要的和挖除树根以便按规定的坡度和线形修建防护栏。
2、立柱的埋设应分段进行，先埋两端的立柱，然后拉线埋设中间立柱。从纵向看，立柱的轴线应在一条直线上，不得出现参差不齐的现象；从高度看，柱顶应平顺，不得出现高低不平的情况。
3、一行防护栏中如有断开处或在道路交叉口时，可视需要适当调整立柱间距。跨越河流时，当河两岸宽不超过6M时，应按图纸所示或用 绳 铁丝 连接起来；当河两岸宽大于6M时，防护栏应做终止封闭连接设置。
4、当图纸要求把立柱、支撑或锚头埋入混凝土基础中时，承包人应设置必要的临时拉索或支撑，以把立柱固定于适当位置，直到混凝土硬化为止。混凝土养生7D期间，不应在立柱、拉索和支撑上安装或拉紧任何材料或部件。所有立柱均应按照图纸要求和线形垂直埋设。
5、尺寸和型号符合要求的防护栏网片，应按图纸规定的方式从立柱端部开始牢固安装到立柱的挂钩上；或将网片安装在框架内，框架与立柱连接应牢固。所有的网片及铁丝均应绷紧而不变形，其安装高度应符合图纸规定。防护网安装完毕，立柱基础均需进行最后压实处理。
6、在高压输电线穿过安装防护网的地方，防护栏应按电力部门的规定接上地线。
7、当电线平行或接近平行于防护网且电线在防护栏上方时，应在每端或按不大于400M的间距埋设地线，接地电阻值小于10Ω（欧姆）。
8、防护栏一般应顺着地形设置。必要时，需进行土工整平，以取得整齐的外观。在低洼地区，当地面纵剖面发生突变，无法保持规定的离地净高时，可使用较长的立柱，然后拉上多股带绳的铁丝。带绳的铁丝之间的垂直净空等于或小于150MM。在开挖或钻孔之后，所有立柱应按批准的方法埋设。立柱一般每隔100M应在其两侧加斜撑，以保证其稳定性；防护网在改变方向的地方，立柱应设三向斜撑。
9、桥梁防护栏（防落网），应按图纸所示安设，牢固地安装在立柱或支撑上；金属网应伸展拉紧，整个结构不得扭曲。
1, the fence should be in as soon as possible after the completion of the subgrade engineering implementation; The contractor shall work out detailed construction organization design before construction to supervision engineer for approval. The contractor shall, according to the approval of construction organization design, according to the requirements of drawings and the actual situation of terrain and object construction lofting, set the column centerline, necessary to clear and invisible roots so that according to the rules of slope and the linear building a fence.
2, pillar of embedding should segments, buried on both ends of the column first, and then stay buried in the middle column. Viewed from the vertical, the axis of the column should be in a straight line, will not appear the phenomenon of uneven; From the height of pillars should be smooth, and may not appear rugged case.
3, or if there is any disconnected in a line of fence, the road intersection, the visual needs to adjust column spacing. Across the river, when the river on both sides of no more than 6 m wide, should be shown in according to the drawing or use barbed wire wire connected; When the river is wide in 6 m, defend the net should be terminated close connection Settings.
4, when the drawings required columns, support or anchor head under concrete foundation, the contractor shall set up the necessary temporary cable or, to put the column fixed in place, until the concrete hardening. During the concrete curing 7 d, should not be installed on the pillar, and lasso supporting or tighten any material or component. All columns should be in accordance with the drawings requirements and the linear vertical buried.
5 protective LanWang pieces, size and type to meet the requirements, should be specified according to drawing way starting from the column end firmly to the pillar of the hook; Or install the mesh in the frame, frame and column connections should be strong. All the mesh and the wire shall be tight and not deformation, its installation height should conform to the requirement of drawings. Fence installed, column base must be final compaction process.
6, where the high voltage power lines across the fence installation, defend the net shall be connected to ground wire according to the power sector.
7, when power lines parallel or nearly parallel to the fence and wire over the fence, should be on each side or by not more than 400 m of line spacing buried less than 10 Ω grounding resistance (ohms).
8, defend the net generally should follow the topography. When necessary, need to flat soil, in order to obtain neat appearance. In low-lying areas, the local surface profile mutations, failing to keep the regulation ground clearance, can use a longer column, and then to draw the iron wire strands of barbed wire. Barbed wire of the wire between the vertical clearance equal to or less than 150 mm. After excation and drilling, all columns should be in accordance with the approved method of embedding. Post general every 100 m should be on both sides of the diagonal brace, so as to ensure its stability; Fence, where change direction column should set three to brace.
9, bridge fence (arrested), shall be in accordance with the drawings shown in install, firmly installed in the pillar or support; m e t al mesh should be stretched taut, the entire structure may not be distorted.
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