How to use pre-stressed plastic corrugated pipe correctly?
Release time:
2023-04-28
How to use prestressed plastic bellows correctly?
Prestressed plastic bellows in the process of use, vacuum grout is a new technology in the construction of post-tensioned prestressed concrete structure, the basic principle of prestressed plastic bellows is: at one end of the hole using a vacuum pump to vacuum the hole, so that it produces a vacuum degree of about 0.1MPa, and then use the grout oil pump to fill the special cement slurry from the other end of the hole until it fills the entire hole, and ≤ 0.7MPa positive pressure to improve the fullness and compactness of the prestressed pore grout.
The prestressed plastic bellows adopts vacuum grouting process to improve the safety and durability of post-tensioned prestressed concrete structures. The prestressed steel bundle of prestressed plastic bellows connector uses the new process of plastic bellows and vacuum-assisted grouting to solve the problems of increasingly long prestressed hole forming, insufficient prestressed tension extension and difficulty in filling the pore grouting at present.
For ultra-long beam prestressed plastic bellows, such as the use of traditional metal bellows as the porous pipe material, there are many drawbacks such as large friction resistance of the porous material, difficult to construct the porous material, easy to leak grout during the construction process, and the grouting is not dense, which is easy to cause tension extension to meet the requirements, vacuum-assisted grouting uses a vacuum pump to first clear the air in the aperture, so that the pore reaches a negative pressure state, and then uses a pulping press to inject the cement slurry into the prestressed aperture at positive pressure, thereby eliminating the bubbles in the pore, Improved the fullness of the grouting in the pores.
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