Tunnel road shot blasting
Reasons for blasting pavement:

To blast the road to a concrete surface laitance, clean up to remove impurities, and can undertake dozen hair treatment on the surface of concrete, make its surface even rough, greatly improving the adhesive strength of the waterproof layer and concrete base, so that the waterproof layer and bridge deck better combination, and at the same time the crack of concrete can be fully displayed, plays the role of the nip in the bud.
Degumming and marking lines of airport runway;
Simple operation and preparation work, at any time to clean up, at any time to evacuate: especially in winter construction is not affected;
Construction operation is more convenient: the cleaning speed and cleaning depth can be set according to different conditions of the runway, and the cleaned surface is neat and beautiful;
After shot blasting, the friction coefficient can reach 0.7-0.75(Mu 65km/H) and the texture depth is 0.45.
Shot blasting equipment can clean up the floating slurry and impurities on the concrete surface at one time.
The most important is that at the same time the concrete surface has been treated with wool, so that its surface to form a uniform rough surface.
The adhesive strength of waterproof layer and concrete base is greatly improved, and in this process, cracks and other diseases of concrete can be fully exposed, so as to take remedial measures in advance.
The skid resistance of the pavement in tunnel has higher requirements.
Shot blasting technology is a simple construction, small equipment investment, low operating cost, effective and environmentally friendly treatment method.
The use of shot blasting equipment to periodically clean the tunnel pavement can greatly improve the friction coefficient of the pavement due to pollution and tire traces and reduce the situation, so that the tunnel pavement slip resistance is greatly improved, significantly reduce the accident rate.

Knowledge extension -- shot blasting principle:

Shot blasting is to rely on the high speed rotation of the Impeller, the abrasive in the center of the Impeller, after the pilot tube (Impeller) pre-acceleration, into the blade area and then the abrasive high speed throw, the speed can exceed 100m/s, because the shot blasting coverage is large, so there is no need to use air pressure, energy efficiency is far higher than the nozzle.
Impeller is the heart of the shot blasting machine, driven directly or indirectly by electric motor is mainly divided into single disc and double disc impeller.
Each impeller can be fitted with 4 to 8 blades.
Single disc impeller is lighter and designed with curved blade;
Double disc impeller is heavier, but easier to load and unload blades and accurate control of throwing abrasive.
Blade shapes can be straight or curved. Straight blade design is simple and can be loaded and unloaded independently. Although this blade design has a smaller cleaning range (see below) and a lower throwing speed, it is common due to its low cost.
Curved blades are more difficult to load and unload and cost more, but they can be cleaned in a wide range and throw out at a high speed.

Key words: tunnel pavement shot blasting bridge support replacement