A, outdoor drainage earthwork:
Trench excavation calculation formula: v = h (b+0.3h) l.
Where: h= ditch depth, calculated according to the design pipe bottom elevation, m;
B= width of trench bottom, m;
L= trench length, m;
0.3= grading coefficient.
Second, the outdoor water supply pipeline earthwork excavation width and depth should consider the following factors:
1. pipe diameter: within the depth of 1.5M, the steel pipe (plastic pipe) water supply pipe, and the trench bottom width is (dn15 ~ dn70) 0.6m.
(DN 100~DN200) 0.7M
Outside the depth of 1.5M, the width of the trench bottom is: pipe diameter+0.6m.
2. Interface position and pipeline slope: determine the excavation depth and slope.
3. Thickness of protective layer: the excavation depth of unpaved pavement is 60cm；; Cross the road and dig at least 100cm.
Three, other excavation depth according to the actual excavation depth, slope as stipulated in the quota.
Extended data:
In civil engineering, the common earthworks include: site leveling, regional balance, foundation pit (trench) and trench excavation, subgrade excavation, civil air defense engineering excavation, ground filling, subgrade filling and foundation pit backfilling.
To arrange the construction plan reasonably, try not to arrange it in the rainy season. At the same time, in order to reduce the construction cost of earthwork and implement the principle of not occupying or occupying less cultivated land and being beneficial to land reclamation, it is necessary to formulate a reasonable earthwork allocation plan and make overall arrangements.
Calculation of earthwork backfill quantity
1, backfill refers to the backfill of in-situ soil at the edge of groove and foundation pit, and the actual backfill volume is calculated in cubic meters.
2, trench, foundation pit backfill, to the excavation volume minus the design of outdoor floor buried objects (including cushion, foundation, pipeline, etc.) calculation. ) volume calculation.
3, trench backfill, to the excavation volume minus the diameter of the volume calculation. If the pipe diameter is less than 500mm, the volume occupied by the pipeline shall not be deducted; When the pipe diameter exceeds 500mm, the volume occupied by the pipeline shall be deducted according to the table.
4. Backfill (rammed) soil shall be calculated according to the volume after rolling or tamping (rammer).
Earthwork distance shall be calculated according to the following provisions:
1. Moving distance of bulldozer: calculated according to the linear distance between the center of gravity of excavation area and the center of gravity of backfill area.
2. Earth moving distance of scraper: calculated from the center of gravity of excavation area to the center of gravity of unloading area plus the turning distance of 45m.
3. Earth moving distance of dump truck: calculated according to the shortest distance from the center of gravity of excavation area to the center of gravity of filling area (or stacking place).
Preparation before earthwork excavation: Before site leveling, measure leveling range line and elevation. Demolition of buildings and structures that affect the construction; Demolition and transformation of communication, power facilities, water pipelines, gas pipelines and underground pipelines; Move trees. Carry out construction drainage. Repair temporary roads, electricity, communication and water supply facilities and temporary houses for living and production.
Drainage of surface water: attention should be paid to keep the drainage ditch unblocked during construction. When excavating intercepting ditch on hillside, when constructing in flat land or low-lying place, in addition to excavating drainage ditch, earth embankment should be built to retain water when necessary.
It should be pointed out that:
Quota calculation rules are compiled on the principle of actually completed engineering quantity calculation. If the foundation is not well done when backfilling, it should not be buckled. If it is a basement, the volume occupied by the basement exterior wall should be deducted. If the backfill elevation is different from the design elevation, the actual backfill elevation shall prevail.
There is also the difference between the design outdoor elevation and the natural ground elevation, and the site elevation of three links and one leveling. This is best based on the actual situation. The amount of earthwork in the construction shall be subject to the actual completion, and the visa shall prevail. For example, if the earthwork excavation is deep, the earthwork quantity of "."will be added to the pit by machinery, and it should also be calculated according to the actual situation.
References:
Baidu encyclopedia-earthwork volume