With the strict control of overload in various places, some urban highway sand and gravel transportation has been replaced by semi-trailer dump trucks with more axles from 4-axle dump trucks.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.

与自卸车相同，城市内运营的搅拌车治超也有趋严发展的形式，根据规定，4轴搅拌车只能安装搅拌容量8立方米的搅拌筒，对于目前动辄18立方米起的4轴搅拌车来说影响很大。

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.

基于这样的背景，一些厂家也推出了混凝土搅拌半挂车，希望用轴数更多的挂车来取代传统的搅拌车。

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.

但是，理想很美好，现实很骨感，大部分卡友好像对此并不买单，提出的问题也非常现实。

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.

半挂车通过性差

Poor trafficability of semi-trailer

混凝土搅拌半挂车为挂车+牵引车的组合形式，整车长度要比4轴搅拌车增加许多，现实生活中的工地并不是每个都有宽敞的施工空间，过长的车身灵活性较差，进出工地非常不便利。

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.

此外搅拌车卸料需要与泵车尾对尾，运输车抵达工地之后需要调头倒车，半挂车在调头和倒车的时候操作难度大，不利于精准调整位置，对驾驶员的要求非常高。

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.

由于轴数增加，但是混凝土搅拌半挂车还是采用6x4驱动的牵引车，只有4个驱动轮，与4轴搅拌车相同。有驾驶经验的卡友都知道，轴数越多动力损耗越大，同样的路面4轴车能走过去，6轴的半挂车可能就会陷住。

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.

简而言之，工地的现实环境会给混凝土半挂车上一场生动的社会实践课。

In short, the actual environment of the construction site will give a vivid social practice lesson to the concrete semi-trailer.

当然也不排除有些工地施工环境较好，路面铺装完备，有足够大的空间，这种施工环境使用混凝土搅拌半挂车没有问题。

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.