With the strict control of overload in various places, some urban highway sand and gravel transportation has been replaced by semi-trailer dump trucks with more axles from 4-axle dump trucks. The total mass of 49 tons of 6-axle trucks is significantly higher than that of 31 tons of 4-axle trucks, which can not only legally avoid overload, but also ensure that the transportation volume is not reduced too much.
Like the dump truck, the overload control of mixer trucks operating in the city also has the form of strict development. According to the regulations, the maximum mixing capacity of 4-axle mixer truck can only be installed with a mixing cylinder with a mixing capacity of 8 cubic meters, which has a great impact on the 4-axle mixer truck from 18 cubic meters at present.
Based on this background, some manufacturers have also launched concrete mixing semi-trailer, hoping to replace the traditional mixing truck with trailer with more axles.
However, the ideal is very beautiful and the reality is very skinny. Most card friends don't seem to pay for it, and the questions raised are also very realistic.
Poor trafficability of semi-trailer
The concrete mixing semi-trailer is a combination of trailer and tractor, and the length of the whole vehicle is much longer than that of the 4-axle mixer. In real life, not every construction site has a spacious construction space, the long body has poor flexibility, and it is very inconvenient to enter and leave the construction site.
In addition, the mixer truck unloading needs to be tail-to-tail with the pump truck. After the transport truck arrives at the construction site, it needs to turn around and reverse. It is difficult for the semi-trailer to turn around and reverse, which is not conducive to accurate position adjustment, and the requirements for the driver are very high.
Due to the increase in the number of axles, the concrete mixing semi-trailer still adopts a 6x4 driven tractor with only 4 driving wheels, which is the same as the 4-axle mixer. Card friends with driving experience know that the more axles, the greater the power loss. If a 4-axle car can walk on the same road, a 6-axle semi-trailer may trap.
In short, the actual environment of the construction site will give a vivid social practice lesson to the concrete semi-trailer.
Of course, it does not rule out that some construction sites have a good construction environment, complete pavement and enough space. There is absolutely no problem using concrete mixing semi-trailer in this construction environment.