Vacuum grouting is a grouting process in which a vacuum pump is used to vacuum the outside of the plaster mold, or the reinforced plaster mold is placed in a vacuum chamber for negative pressure operation. Vacuum grouting reduces the formation time of the blank by increasing the pressure difference between the inside and outside of the plaster mold, and increases the density and strength of the blank. Vacuum grouting is useful for overcoming defects such as pinholes and pores.
Compared with conventional grouting, vacuum grouting creates conditions for the formation of a vacuum-prevented pre-stressed channel from the formation of pre-stressed channels. Vacuum grouting holes are generally formed by high-density polyethylene plastic corrugated pipes. The joints between the bellows are made of special joint pipes of the same material. The corrugated pipe and the anchor plate are connected by a special joint to ensure the pipe is sealed.
The main application of vacuum pump in vacuum grouting is to use a piston vacuum pump to vacuum the hole at one end of the tunnel to produce a vacuum of about -0.1PaM, and then use the grouting pump to fill the optimized special cement slurry from the other end of the tunnel. Into, until the entire hole is filled, and a positive pressure of ≤ 0.7Mpa is added to improve the fullness and compactness of the prestressed tunnel grout.
Vacuum grouting is a commonly used process in bridge concrete structures. Grouting of the tunnel is a key link. The traditional grouting process will cause corrosion and component cracking after a long time of use, which has great safety hazards.
2X-A Rotary Vane Vacuum Pump
Main technical advantages of piston vacuum pump for vacuum grouting process
1. Under vacuum, the air, water and bubbles mixed in the cement slurry are eliminated, reducing pores and bleeding.
2. The hole in the grouting process has a good sealing property, which ensures the pressure of the slurry and fills the entire tunnel.
3. Process and slurry optimization, eliminating the occurrence of cracks, ensuring the fullness and strength of the grout.
4. The vacuum grouting process is a continuous and rapid process that shortens the grouting time.
Vacuum grouting is a new technology in the construction of post-tensioned prestressed concrete structures, which largely solves the problems left by the traditional grouting process. The use of piston vacuum pump grouting technology is to improve the safety and durability of post-tensioned prestressed concrete structures. Effective measures.
SV Rotary Vane Vacuum Pump
In the vacuum grouting, the rotary vane vacuum pump of 2X-A or SV series is generally used. The rotary vane pump designed by Shanghai EVP Vacuum Technology Co., Ltd. has good performance, low noise, small volume, easy operation and reasonable price, and timely after-sales. It is your Excellent choice. The following are real photos of these two pumps, please feel free to contact us if you have any questions!
Key words: rotary vane vacuum pump, 2X-A rotary vane vacuum pump, SV rotary vane vacuum pump
Edited by: Emily Fu / Shanghai EVP Vacuum Technology Co., Ltd.