1. The original ground is flat
Measure the original ground elevation of the fence installation section, if the ground undulation is not large, you can properly adjust the fence
The depth of the fence pit is used to unify the horizontal elevation of the columns. When the ups and downs are large, the slope protective fences shall be set up collectively.
Before installing the protective fence, the ground on both sides of the fence should be leveled and compacted.
When there is a height difference on both sides of the slope or the fence, the raised part within 2m on both sides of the fence should be
For leveling, the ground on both sides should be at the same height and not higher than the bottom of the lower sill of the fence to ensure that the fence
The protective height is reached relative to the ground on both sides.
2. Foundation pit excavation
Excavate the column foundation pit according to the measurement stakeout position and elevation, and the foundation pit should be excavated vertically.
The size of the foundation pit shall meet the design requirements, and the undisturbed soil on the side of the foundation pit shall not be disturbed.
General soil section, foundation bearing capacity ≥ 100kPa, resistance to lateral stress ≥ 60kPa
The foundation is poured with C25 concrete. The base size of the 1.8m high protective fence adopts
600mmx600mmx700mm, the base size of the protective fence in the slope area adopts
600mmx600mmx900mm. The disturbed soil should be excavated and backfilled, and the compaction coefficient of the backfilled soil is not
less than 0.93.
3. Component stacking and transportation
Upright posts, upper sills, lower sills and post caps should be protected during transportation, with straw mats,
Straw, sawdust or other cushioning and shockproof materials, the number of stacked layers shall not exceed five layers, and the height shall not exceed
More than 600mm. The metal mesh and connecting components are protected by effective packaging to prevent bumps.
Reinforced concrete fences should be arranged vertically with cushioning materials in them to prevent bumps.
4. Column embedding
After digging the foundation pit, when embedding the columns, the position and elevation should be strictly controlled, and measured with a ruler.
Measure its verticality and measure its height with a tape measure. After confirming that it meets the requirements of the construction drawing, use a temporary support
The support is fixed, and the column is not displaced vertically and horizontally. The foundation is poured with C25 concrete.
The column support can be removed only after the concrete strength reaches 70% of the design strength.
5. Install the lower sill, fence, upper sill and column cap
After the strength of the concrete foundation reaches more than 80% of the design, install the lower sill, fence, upper
C30 fine concrete or M30 cement sand should be used for the gap between the sill and column cap, the upper and lower sill and the fence piece
The grout is filled to form a solid whole, and there must be no shaking of the fence after fixing.
The connecting bolts between the column cap and the column should be tightened with a socket wrench, and the top should be filled with cement mortar.
When the upper sill is connected with the uphill column, first inject C30 water into the round hole reserved on the upper sill
Mud mortar (mixed with quick-setting agent), penetrate the roughened end of the screw through the reserved hole of the column, with mortar
After solidification, it is fastened. After the fastening is completed, the reserved holes on the columns are filled with cement mortar.
