When "nibbling" the "hard bone" of cement concrete, the higher the frequency of the chisel bit, the less the impact force, and the more time-consuming, so some construction units mistakenly think that the efficiency of the chisel is relatively low, and it is not enough to use more manpower to chisel with a sledgehammer, which is a mistake
It should be noted that excessive impact will destroy the underlying structure of the structure, leaving hidden dangers to the project. In addition, large milling machine or shot blasting machine should be used carefully when chiseling between layers of large cement concrete pavement. Because the milling head of the milling machine is rigidly connected with the rotor of the milling cutter, the rotor of the milling cutter is very heavy, and the density of the cutter head is relatively small, resulting in less contact points between the chip and the working face, and the impact force of the rotor is very large. The milling machine not only milling cement slurry and part of bone material, but also vibrating part of aggregate, affecting the overall structure. (the main function of milling machine is milling old asphalt concrete pavement).
Therefore, when selecting equipment, we should first consider whether its function is suitable for the project to ensure the construction quality of the project.
In the process of road construction, shot blasting machine, when the impact force is too big, clean face is also beautiful after construction. It ejects particles (steel shot or sand) on the working surface of projectile at high speed and at a certain angle by machinery, therefore, it impacts the working surface of granular material, and supports the air flow of the cleaner inside the cleaning action of the machine and the cleaning downward granular material impurity recovery and the granular material can be reused. The machine is equipped with dust, so that dust-free, pollution-free construction, both improve efficiency and environmental protection.
Working conditions of road shot blasting machine:
1. The working face is uneven for 20 mm, free of water, relatively dry, with a gradient of 25 °.
2. Ambient temperature: - 20 ℃? 60 ℃; the dew point of steel plate surface temperature lower than 3 ℃ is large
Three. Humidity: a. the relative humidity of steel surface during shot blasting is not more than 90%
The relative humidity of concrete shot peening shall not exceed 95%.
IV. height: 0? 3000m; unable to operate in rainy and snowy weather
Working efficiency of road shot blasting machine:
Working efficiency of cement surface: 200 square meters per week
Steel quality level, SA3, SA 2.5, speed: about 4m / min in steel structure Sa2.5; SA3, about 3m / min, processing area per hour: about grade Sa2.5 of 75-100m2 / h.
Surface treatment of concrete bridge deck pavement: since the 1970s, the waterproof layer has been widely used in the concrete bridge deck pavement, which greatly reduces the damage caused by concrete bridge leakage and prolongs the service life of the bridge. However, with the increase of traffic volume, the bond strength of waterproof layer, surface layer and bridge deck is not enough to cause the disease. In China, similar diseases often occur in concrete bridges, as well as loose concrete, falling off and corrosion of reinforcement due to leakage. One of the reasons for the above diseases is that the treatment of the concrete surface can not completely remove the surface residual materials, do not retain a certain rough surface, and ensure the bonding strength of the waterproof layer and the bottom layer of the bridge deck.
Performance advantages of road shot blasting machine:
Sand blasting technology can be used to clean the laitance on the concrete surface and remove the impurities. The most important thing is to roughen the concrete surface at the same time, evenly roughen the surface, greatly improving the bonding strength of the waterproof layer and the concrete foundation. And in this process, shot peening can also be fully exposed to diseases, such as cracks in concrete, in order to take remedial action in advance.
Shot blasting equipment is widely used to improve the roughness and friction coefficient of asphalt pavement, so as to improve the adhesion of pavement and ensure driving safety. At the same time, it can also remove the adhesion of asphalt pavement (such as fuel oil, engine oil, etc.).
The road shot blasting machine is mainly used in the following aspects:
(1) sliding treated asphalt pavement
The influence of road roughness on traffic can not be ignored. Traffic accidents caused by road slippage are increasing every year. For example, it is very convenient and flexible to use the road shot blasting machine to reconstruct the turning section and accident prone section to improve the anti sliding performance of passing vehicles.
(2) oil spill cleaning of pavement
Due to the climate conditions of highway and highway, the asphalt pavement is often flooded, which affects the normal driving of vehicles. The shot blasting machine can directly remove the surface water immersion of asphalt pavement and improve the skid resistance of asphalt pavement.
(3) pavement surface cleaning of marking line
Cleaning up old markings on the road is also a headache. It is convenient to clear the marking line by using the road surface shot blasting machine / ground mobile shot blasting machine, especially suitable for the cleaning of cold paint marking line and municipal pedestrian street.
(4) surface peeling and cleaning of pavement overlay
When using the surface roughness which may increase the structural durability of the slurry of the cover layer, the first shot peening resin material can greatly improve the covering bonding strength of the resin coating and the original substrate layer.
(5) rubber mark removal of airport runway tire
High speed take-off and landing aircraft on the airport runway will leave tire traces on the runway, which will affect the safety of aircraft take-off and landing. The cleaning speed and depth can be set according to different situations of the runway, and the cleaned surface is very neat and beautiful. In particular, winter construction will not be affected.
(6) clean the steel surface, ship deck, deck steel box girder bridge and oil drilling platform.
The surface of ship deck, steel box girder bridge deck, oil drilling platform, chemical oil tank, internal surface of ship and steel plate can be derusted, derusted and roughened by road shot blasting machine to fully meet the pretreatment requirements of anti-corrosion layer or heavy anti-corrosion layer.
