Reinforcement protection method for inner surface of tunnel

Abstract

The inner tunnel surface reinforcing and protecting method includes adding polyacrylic emulsion and polyacrylic fiber into waterproof cement mortar to raise the surface strength of inner tunnel surface and to prevent crack, water permeation and high temperature blowout. The method includes the first compounding waterproof cement mortar with cement, sand, water and polyacrylic emulsion in the ratio of 1 to 0.5-0.7 to 0.4-0.6 to 0.005-0.008; the subsequent mixing polyacrylic fiber in the amount of 0.006-0.008 of cement mortar weight with cement mortar to form modified cement mortar; and final spraying the modified cement mortar to the inner surface of the concrete structure. The polyacrylic fiber resists the stresses of cement shrinking in different directions to raise the strength of solidified waterproof mortar and raise the fireproof limit. In addition, the grille net has crack resisting reinforcing effect.

Description

Technical field:

[0001] The invention relates to a method for reinforcing and protecting the inner surface of a tunnel. Background technique:

[0002] At present, the tunnels used for driving vehicles are basically reinforced concrete structures, but with the extension of the service life of this structure, micro-cracks and water seepage often appear on the inner surface of the tunnel. Corrosion hazards caused by facilities and equipment also shorten the service life of the tunnel and make it difficult for vehicles to pass. As a symbol of a modern city, the subway brings great convenience to the travel of urban residents. However, there are still no effective solutions to the phenomenon of micro-cracks and water seepage on the inner surface of the subway tunnel. In addition, the concrete on the inner surface of the tunnel is prone to bursting in a high-temperature environment. If a fire occurs in the tunnel, it will cause large-scale damage to the wall. Invention content:...

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