Definition of concrete drainage pipe Reinforced concrete drainage pipe is our common cement pipe, also called cement culvert pipe. A single-layer or multi-layer cement concrete circular tube with steel skeleton is arranged in the pipe wall of the reinforced concrete drainage pipe. It is manufactured by centrifugal, radial extrusion, vertical shaft vibration and other processes, which strengthens the hardness and ensures the external pressure resistance. It is widely used in rainwater and sewage discharge of municipal pipeline projects, industrial wastewater discharge, residential drainage projects, embedded pipes and water seepage of railway expressways, mine drainage projects, irrigation and drainage of agriculture and forestry, shaft lining pipes of excavation projects, water conservancy projects and so on.
Classification of concrete drainage pipes Reinforced concrete pipes are divided into plain concrete pipes, ordinary reinforced concrete pipes, self-stressing reinforced concrete pipes and prestressed concrete pipes.
Concrete pipes are divided into small diameter pipes (inner diameter less than 400 mm), medium diameter pipes (400~ 1400 mm) and large diameter pipes (more than 1400 mm).
According to the different water pressure bearing capacity, pipelines can be divided into low-pressure pipelines and pressure pipelines, and the working pressures of pressure pipelines are generally 0.4, 0.6, 0.8, 1.0, 1.2 MPa, etc.
Compared with steel pipes, concrete pipes can be divided into flat pipes, socket pipes and tongue-and-groove pipes according to different types of pipe joints.
Function of concrete drainage pipe
Vertical and horizontal drainage and seepage of expressway; Vertical and horizontal drainage on the back of various retaining walls and ditches on expressways; Drainage of tunnels and underground passages; Municipal engineering, water purification plants, sewage plants, garbage dumps and other water supply and drainage; Drainage of golf courses, sports fields, parks and other rest green spaces; Soil and water conservation of hillside development slope; Underground drainage of land consolidation project.
Specification of concrete drainage pipe Internal diameter of pipe (mm)
200、300、400、500、600、800、 1000、 1200、 1350、 1500、 1650、 1800、2000、2200。
Outside diameter of pipeline (mm)
260、360、480、600、720、960、 1200、 1440、 1620、 1800、 1980、2 160、2400、2640。
Outside diameter of socket (mm)
495、6 10、785、900、 1 120、 1375、 1475、2055。
Advantages and disadvantages of concrete drainage pipe Advantages of concrete drainage pipe ① Reinforced concrete drainage pipe has good quality and low manufacturing cost; (2) The production technology of reinforced concrete drainage pipe is relatively simple and the production speed is relatively fast, which can meet the needs of customers quickly;
(3) The reinforced concrete drainage pipe itself has high hardness and can withstand strong water pressure;
(4) The reinforced concrete drainage pipe is reasonable in structure and can be well combined and connected together, thus ensuring the overall tightness and avoiding the leakage problem;
⑤ The inner wall of the reinforced concrete drainage pipe is smooth, which ensures the smoothness of the system, so the reinforced concrete drainage pipe is not easy to accumulate and block impurities.
Disadvantages of concrete drainage pipe ① Self-weight: The gravity density of reinforced concrete is about 25kN/m, which is greater than that of masonry and wood. Although it is lighter than steel, the cross-sectional size of the structure is larger, so its own weight far exceeds that of the steel structure with the same span or height.
② Poor crack resistance: The tensile strength of concrete is very low, so ordinary reinforced concrete structures often work with cracks. Although the existence of cracks does not necessarily mean that the structure is destroyed, it affects the durability and aesthetics of the structure, and there are also certain security risks.
③ Brittleness: The brittleness of concrete increases with the increase of concrete strength grade.
The reinforced concrete drainage pipe should be flat inside and outside, and the pipe should be free of sticking skin, pockmarked surface, honeycomb, collapse and empty drum, and the depth of local pits should not be greater than 5 mm
Cracks are not allowed on the outer surface of reinforced concrete drainage pipes, and the width of cracks on the inner surface shall not exceed 0.05MM, except for surface cracks and shrinkage cracks of mortar layer.
There should be no slurry leakage at the joints, and the defects can be repaired. The surface pits shall not exceed 10mm, the depth of adhesive skin, pits and honeycomb shall not exceed 1/5 of the wall thickness, and the maximum value shall not exceed 10mm, the total area shall not exceed 1/20 of the corresponding or external area, and the area of each block shall not exceed 65438+.
The inner surface of reinforced concrete drainage pipeline has local collapse, but the collapse area does not exceed 1/20 of the inner surface area of the pipeline, and each area does not exceed 100 square centimeter.
The leakage depth of the joint shall not exceed 1/5 of the wall thickness and the maximum length shall not exceed 1/5 of the pipe length.
Construction method of concrete drainage pipe grooving construction scheme: during construction, trench shall be excavated according to survey setting-out. Generally, reinforced concrete pipes are used for cement drainage pipes with small and medium diameters, and concrete or masonry pipes and canals are used for large and medium diameters. Because the drainage pipeline is self-flowing, the accuracy of water level elevation is the key to the construction quality, so the construction must be strictly controlled according to the design. Sewage pipes should be impervious and leak-proof, and the pipes should be checked for leakage after completion.
Pipe jacking method: the pipe jacking method mostly adopts tongue-and-groove pipe or flat pipe. The pipeline is placed on the guide rail, jacked by jacking equipment, and then the space of earthwork is excavated in the pipeline, so the construction method of digging jacking is called pipe jacking method.
Shield method: shield machine is a large working pipeline with excavator and jacking equipment. The lined pipe section is pushed forward as a back seat, and the space left after pushing is used for lining the pipe wall to form the pipe body. At present, large drainage pipelines in China are constructed by shield method.
Code for construction of concrete drainage pipes Before laying reinforced concrete drainage pipes, the pipes must be inspected to confirm whether there are cracks and integrity.
The foundation must be strictly controlled, and the quality of the foundation has a great influence on the later construction. Therefore, the foundation of pipeline laying must be strictly controlled, because the quality of the foundation directly affects the later construction.
When laying the pipeline, it must be carried out according to the construction plan, so don't rush to lay it, which will seriously affect the quality problems after laying.
After the pipeline is laid, it must be tested, and the problems found should be repaired in time to eliminate potential safety hazards.
Maigu Bian Xiao reminded that the construction must be carried out in strict accordance with the established specifications to ensure the safety of personnel construction and avoid accidents. Details >>
Steam curing method for storing and curing cement pipes in concrete drainage pipes: firstly, steam curing pool should be built. Generally, the steam curing pool needs to be 2.5 meters wide, 4 meters long and 3 meters deep, and its size can also be determined according to its own production and the size of the cement pipe mold. A boiler is also needed to transport steam to the steam curing pool. After the cement pipe is made, it can be hoisted into the steam curing pool for steam curing. Steam curing generally takes 2.5 ~ 3.5 hours to cure cement pipes.
Natural curing method of cement pipe: after the cement culvert pipe is made on the cement pipe making machine, don't open the mold. Put the cement pipe mould and cement pipe in the open air for natural curing. Generally, it takes one day for cement pipes to be cured in the open air, and the mold can only be opened the next day. It needs natural curing for 4-6 days after mold opening. It is also necessary to spray water on the cement pipe three times a day, usually once in the morning, once at noon and once in the afternoon.
Scutellaria baicalensis Georgi, a brand of concrete drainage pipe, is mainly propagated by seeds, and can also be propagated by cutting roots and dividing roots. Scutellaria baicalensis likes warmth and cold tolerance, and the underground part can tolerate the low temperature of -30℃; Drought tolerance and fear of freezing, planted in poor drainage or rainy areas, poor growth environment, easy to cause root rot.
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