Zhengzhou Cement Pipe Plant
2、 Why the price of reinforced concrete cement pipe fluctuates. In economics, an important factor affecting the price is people's demand for this product. This is an important factor. When the demand is greater than the supply, the supply falls short of demand, and the price will naturally rise; But when the demand is less than the supply, when the supply exceeds the demand, the price will naturally decline, but the rise and decline will not be too high or too low. The higher the value, the higher the price. The lower the value, the lower the price. This supply is affected by many factors.
Zhengzhou Cement Pipe Plant
The common problem of cement pipe is erosion. The erosion problem of cement pipe mainly includes crevice corrosion and corrosion. These two erosion methods belong to diffuse erosion and are not easy to be detected by inspectors. The other kind of intergranular corrosion cracking is the pipeline cracking caused by erosion and other external effects of support force and ground stress, causing huge damage. At this time, the pipeline shall be removed and replaced in time. There is also a common problem of mechanical equipment damage. This kind of damage mainly includes chisels and pits containing chisels, which is generally caused by mechanical equipment damage. External cracks are also a problem of cement pipes. These problems belong to the plan problem and can be easily detected. Peeling is a relatively serious damage condition, and perforation will lead to fracture or leakage.
Zhengzhou Cement Pipe Plant
The cracks on the surface of cement pipe are mostly caused by folding, and the key can be divided into two categories: one is caused by the evaporation and hardening of the water on the surface of cement pipe during rigid concrete pouring. Generally, the average external temperature of cement pipe during rigid concrete pouring is high, while the air humidity in the air is low, so the surface will volatilize and dry, but the interior is still plastic, This causes cracks. The other is caused by the temperature difference between the inside and outside of the concrete caused by the water cement ratio when the cement pipe is hardened. For deeper cement pipes, the foundation will continue to settle due to its own weight during the whole process of concrete pouring of the top cement pipe. When the cement pipe is exposed to building reinforcement or the connecting anchor bolt of the template and other items just before the final setting but not before the final setting, this kind of foundation settlement will be blocked and will immediately cause cracks.
Zhengzhou Cement Pipe Plant
Compared with other pile types, especially prestressed concrete pipe piles, hollow square piles have the following outstanding advantages: ① large surface area and square or polygonal angle, the angle of repose between the pile and the soil in the soil layer is much larger than the circular surface, which means that hollow square piles can obtain greater bearing capacity than pipe piles under the same geological conditions, saving a lot of foundation funds for the project; ② By comparison, the bearing capacity of 350 hollow square piles is equivalent to that of 500 outer diameter thick wall pipe piles, and the cost per KN bearing capacity is lower than that of prestressed concrete pipe piles, which means that designers can select square piles under the same design bearing capacity, while the market price of 350 hollow square piles is less than that of 500 outer diameter thick wall pipe piles, which can save a lot of material costs;
Zhengzhou Cement Pipe Plant
More rigorous and standardized measures and construction steps are also proposed for the cement pipeline according to the requirements: first, the surveying and setting out work should be in the charge of a full-time surveyor, and the construction of surveying and setting out records and check filing system should be strictly implemented, using calibrated instruments. According to the design drawings and pile handover records, check the bench marks, establish temporary bench marks, do a good job of protection, and conduct closed resurvey to control the elevation. Secondly, after the trench is excavated in sections, the elevation and elevation shall be reviewed in time to control the elevation of excavation, cushion and foundation surface. Then the block stones are pressed and compacted, the soil is removed, the reinforcement is laid, and the plank is erected Re pouring place.
Zhengzhou Cement Pipe Plant
Precautions for installation and connection of cement pipe 1. The newly welded joint can be corrected within the specified cooling time, and a small amount of rotation is allowed. However, after the cooling time, forced correction is strictly prohibited. Note: The connected pipes and pipe fittings shall not be inclined. They shall be basically horizontal and vertical to avoid incorrect angle when installing the faucet. 2. It is forbidden to let the newly processed joint bear external force within the specified cooling time. 3. When PP-R pipe fittings with metal threads are used, the white raw material tape must be firmly sealed to avoid water leakage from the threads. 4. When overtightening PP-R pipe fittings with metal threads, the pipe fittings may be cracked, resulting in water leakage. Pay attention to the appropriate force.
