Generally, low-grade concrete is adopted for the shaft bottom, and crushed stone, pebble or concrete is adopted for the foundation; The flow channel should be set and the bottom of the flow channel should have a certain slope to reduce the flow resistance and prevent sedimentation; The width between the two sides of the launder and the shaft wall shall be no less than 20cm, so as to facilitate the maintenance personnel to stand on the trench shoulder when they go down the well.
△ FRP pipe 3.
Foundation includes: foundation, foundation, pipe seat ① sandy soil foundation, arc plain soil foundation and sand cushion foundation.
Nozzle type: socket and flat mouth (3) metal pipe has high strength, impermeability, smooth pipe wall and few interfaces; High price and easy to corrode.
Auxiliary structures of water supply pipeline (1) function of valve well: install various accessories of water supply pipeline to facilitate operation and maintenance.
Basic requirements: sufficient strength and certain rigidity; smooth inner wall surface of the pipeline; reduced water flow resistance; certain corrosion resistance; sufficient airtightness; easy processing; economy 2.
Structure: it is composed of foundation, grate, shaft and connecting pipe.
The elevation of the pipe center shall be marked for pressure pipes, and the elevation of the inner bottom of the ditch (pipe) shall be marked for ditches and gravity pipes.
Location: Road intersection, a certain distance (25-50m) on the straight line, low-lying land of curb.
I hope it can help you.
Nozzle connection: bonding and electrofusion welding common pipes: UPVC rigid polyvinyl chloride, PE polyethylene, PP polypropylene.
Orientation: coordinate network or compass road plan: center line, side line, stake number and other pipelines: rainwater y, sewage W, water supply J, expressed in different lines..
For example, cast iron pipe DN25 outer diameter: D ×δ， Commonly used for stainless steel pipe and seamless steel pipe.
The shaft is built with bricks and stones, and can also be cast in situ with reinforced concrete.
Position: elbow, tee, reducer and other positions III.
It is applicable to sections with poor soil quality and crossing railways and roads.
It is suitable for areas with very good soil conditions and no groundwater, The pipeline with the diameter less than 600mm and the covering thickness of the pipe top between 0.7-2.0m, the secondary pipeline and temporary pipeline not under the carriageway.
It is suitable for sections with high seismic grade, high underground water level or high pressure, serious quicksand or high leakage requirements.
Nozzle type: socket, flat mouth and tongue and groove (2) the wall of ceramic pipe is smooth, impermeable and corrosion resistant after glazing; Fragile and low strength.
(2) Function of rainwater inlet: collect rainwater from surface runoff and introduce it into rainwater pipeline.
② The concrete sleeper foundation is provided with concrete cushion blocks under the pipe interface, which is applicable to the areas with good soil conditions and no groundwater, and the water supply and drainage branch pipes.
Today, I have sorted out the contents related to the construction and design of municipal pipelines.
2.
Auxiliary structure of drainage pipeline (1) inspection well n function: it is convenient to connect the pipeline and conduct regular inspection and dredging.
The diameter of well chamber shall not be less than 1m, and the diameter of shaft shall not be less than 0.7m.
For example, the plan of reinforced concrete pipe D300 IV shows the plane position of the pipe, the diameter, length and gradient of the pipe, the position and number of the inspection well, and the direction of water flow.
1、 Pipeline material 1.
Reinforced concrete cover plate can also be added to the well chamber, and the shaft can be built on the cover plate.
For shallow inspection wells that do not need to be lowered, the well body is of straight wall cylindrical shape; The well body that needs to be lowered is structurally divided into three parts: well chamber, tapered part and well bore.
The well cover is composed of a well cover and a cover seat, and cast iron and reinforced concrete are commonly used.
Scale: 1:500 or 1:1000, consistent with the road construction drawing.
② Accessories: water transmission and distribution control check valve: control the flow of water in only one direction to prevent backflow; exhaust valve: gas in the ribs pipeline to reduce the flow resistance; drain valve: empty the pipeline and remove the sediment; fire hydrant: fire truck water intake facilities II.
Pipeline structure 1.
4.
2.
To prevent rainwater from flowing in, the top of the cover should be slightly higher than the ground.
(5) New pipes: nhdpe high-density polyethylene, FRP glass fiber reinforced plastic, glass fiber reinforced concrete, etc.
Common pipes (1) concrete pipes and reinforced concrete pipes have high strength and convenient materials; Poor acid-base resistance and impermeability, many joints, heavy self weight, and easy to be damaged during transportation.
Nozzle type: flange and socket n common pipes: steel pipe, cast iron pipe △ cast iron pipe (4) plastic pipes are easy to construct, light in material and smooth in inner wall; Low strength, poor rigidity, large thermal expansion and cold shrinkage, and easy to aging under sunshine.
Source: if there is any infringement in Zhulong forum, please contact to delete the municipal pipeline as one of the important components of urban infrastructure, which can timely remove the urban surface rainwater, provide industrial and domestic water for the city, and prevent the urban water resources from being polluted.
(3) buttress function: to prevent the socket interface of the pipeline from falling off due to excessive water flow thrust.
It is suitable for removing acidic industrial wastewater or corrosive groundwater.
Elevation standard stipulates that absolute elevation shall be marked for outdoor works; Relative elevation can also be marked when there is no absolute elevation.
According to the form of pipe socket, there are four kinds of pipe socket foundations: 90 °, 135 °, 180 ° and 360 °, which are selected according to the buried depth of the pipeline.
Such as stainless steel pipe d108 × 4 inner diameter: D, commonly used for concrete pipes, clay pipes, etc.
Structure: it is composed of well bottom, well body and well cover.
The nominal diameter of pipe diameter: DN, which is commonly used for metal pipes.
(2) function of drain valve well: it is composed of the wet well and the valve well to discharge the water discharged by the drain valve.
The well chamber and the wellbore are connected by a tapered part.
Water supply pipe fittings ① fittings n are used at the turning, branching, reducing and connecting other equipment of the pipe, such as tee, cross, elbow, reducer (reducing pipe), short pipe (changing interface), etc.
general provisions of pipeline engineering drawing 1.
③ The concrete belt foundation is laid with belt cement concrete n along the whole length of the pipeline, which is suitable for all kinds of soil, especially poor soil conditions, earthquake areas, important pipelines, etc.
Location: pipeline intersection, turning, change of size or slope, water drop, and straight line section with a certain distance.
