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5. On both sides of the trench and 1m above the bottom of the trench, elevation piles shall be set symmetrically, and elevation nails of equal height shall be nailed on them. The center line of the pipe channel and the elevation of the elevation pile shall be re measured before the bottom of the trench is reached and the pouring is leveled. 6. The height of soil piling on one side of the trench shall not be more than 2 meters, and the distance from the trench edge shall not be less than 1 meter. The protection of underground pipelines for trench construction shall be disclosed to the relevant departments first to clarify the basic location of underground facilities. If necessary, sample holes shall be excavated first to find out the exact location, facilitate construction, and ensure the safety of various embedded pipelines, Support protection measures shall be taken for exposed pipelines.

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The newly developed hollow square pile has completely overcome this disadvantage by combining centrifugal and prestressed technology with internal hollow. In the market, prestressed concrete pipe piles are used more frequently in industrial and civil buildings. They overcome the shortcomings of the previous pile types and have their own characteristics, but the disadvantages are also obvious: the appearance is smooth and round, especially when used as friction piles, the friction force with soil is small, and many projects have to use pipe piles with large outer diameter or simply use solid square piles, Increased project cost; The bending resistance of thin-walled pipe piles is poor, especially the shear resistance and tensile resistance of the pile body, which has buried hidden dangers in the foundation of the building

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Reinforced concrete cement pipes are very common in our daily life. The common places are urban underground sewage pipes and farmland irrigation pipes, which have gradually become indispensable products for urban development. However, the price of reinforced concrete cement pipes is not always the same. Many factors have a certain impact on the price of cement pipes, so why does the price fluctuate, What are the specific factors? Next, the manufacturer of Pinghu Huafeng cement pipe will explain the factors that affect the price fluctuation of reinforced concrete cement pipe.

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Maintenance means no steam curing tank. After the cement pipe is made on the cement pipe making machine, it is not necessary to open the grinding tool. Put the cement pipe mold and cement pipe outdoors for regular maintenance. Generally, after the cement pipe is made, it takes one day to carry out outdoor maintenance. The grinding tool can be opened the next day. After the mold is made, it also needs to carry out 4-6 days of regular maintenance, and full-time personnel should spray water on the cement pipe three times a day, The time of sprinkling is usually once in the morning, once in the afternoon and once at noon. The purpose of sprinkling is to maintain the environmental humidity of the cement pipe so that the concrete can gradually coagulate itself. The frequency of sprinkling can also be increased and reduced according to the environmental humidity of seasonal changes in weather conditions. But of course, there are more cement pipe molds required for maintenance.

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The shape of square pile is easier to develop a non welded quick connector, which can truly achieve all-weather construction, and construction is faster, which can avoid cracking of welded pile head in high groundwater level. 1) Positioning, centering and leveling of the pile driver. After the mixing pile position is placed, move the mixing pile driver to the designated pile position, centering and leveling (leveling with a level). 2) Adjust the verticality of the guide frame, and use a theodolite or plumb bob to control the verticality of the guide frame in both directions. According to the design and specification requirements, the verticality is less than 1.0% of the pile length. 3) The slurry is premixed in advance. While the deep mixer is premixing and sinking, the cement slurry is mixed in the background and put into the aggregate hopper before grouting. The cement grade 425 # ordinary silicate cement is used to mix the slurry, the water cement ratio is controlled in the range of 0.45~0.50, and the cement consumption per meter of deep mixing pile is not less than 50Kg according to the design requirements.

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The theoretical calculated shear resistance of square pile is 2-3 times of that of the same pipe pile. According to the actual test of Japan's Ministry of Construction, it is 4.5 times of that of the pipe pile. This shows that the seismic performance of hollow square pile is very superior, and it is worth popularizing in earthquake prone areas, high-rise buildings, and building foundations with large areas of basements; The hollow square pile inherits and develops the low construction damage rate of the original concrete square pile. The high-strength concrete with a square head has better impact resistance than the pipe pile, and a much smaller damage rate of the pile head; The square has a larger welding perimeter than the round, fully ensuring the effective welding strength between each section of the pile, greatly reducing the joint desoldering or displacement of the square pile during construction, and making the pile quality better