Types of Rollers

Depending upon the project requirement and soil to be compacted, different types of rollers are used for compaction work. The various types of rollers which are used for compaction are:

1. 圆柱辊s
2. 绵羊滚子
3. Pneumatic tyred Rollers
4. Smooth wheeled Rollers
5. 振动辊
6. 网格辊

这following types of road rollers are generally used.

1。圆柱辊

• This is a light roller of iron, concrete or stone; drawn by hand or bullocks. The size varies, but it is generally about 1 metre in dia. and about 1.5 metre long.
• 这种类型的辊产生的接地压力大约新利18体育官网登录7 kg/cm²。

2。绵羊脚辊

• As the name indicates, this type of roller consists of a drum having many round or rectangular shaped protrusions or “feet” on it. These rollers are also calledtamping rollers。
• 各种类型的直径和宽度的宽度以及不同的长度和脚的形状可用。最常见的类型是，根据脚的形状，具有两个鼓宽为1.22米的鼓和1.06。
• Area of each protrusion can vary from30至80厘米²。
• 这覆盖范围area is about8 to 12%.
• 这压实层的厚度比每英尺的长度高约5厘米新利18体育官网登录。
• 这种类型的辊子主要用于压实粘性土壤，例如重粘土和粉质粘土。沙质土壤无效。
• 这weight of the drum can be increased by filling the drum with water or damp sand.
• 控制土壤压实量的因素如下：
  • Gross weight of the roller
  • 每根脚
  • No of feet or lugs in contact with ground
  • Total no of feet per drum
  • Maximum pressure is exerted on soil when a foot is vertical.
• 这soil is supposed to be consolidated when the impression by the projecting teeth is not more than 12 mm deep or when the surface has been rolled16至20次。
• 10 to 20 passes通常需要提供完整的覆盖范围。
• 这density of the consolidated soil should be about 1.48 kg/cm³。这top layer has to be finished with a smooth wheel roller.
• 通过用湿沙或其他一些材料填充鼓来增加脚的压力，这可能是4至7kg/cm²对于轻型辊和25至70千克/厘米²适用于巨型辊。

3。Pneumatic Tyred Rollers

• 这种类型的辊子由一辆重载的货车组成，有几行四到六个紧密间隔的轮胎。这也称为橡胶tyred辊。
• 它在整个宽度中提供了均匀的压力。
• 2factors governing the amount of compaction are as follow
  • 轮胎压力
  • 接触区域
• 轮胎压力可能达到大约新利18体育官网登录7 kg/cm²
• 这覆盖范围area is about80％。
• 滚筒的毛重约为6至10吨，通过使用钢截面或其他方式进行压载，可以增加新利18体育官网登录至25吨。
• 这maximum density can be achieved by8 passesof the roller. The optimum speed of roller is between6 to 24 km/h。
• 用于压实冷铺设的沥青路面，软基水平材料或松散的土壤层。新利客户这些滚筒也适合压实紧密渐变的沙子，以及在水分含量接近其塑料极限的细粒度内聚粘性的土壤，尽管压实不如光滑的车轮辊那样高。
• 这y are particularly efficient when used to finish off the embankment compacted by sheepsfoot roller or on loose sandy soils.

4。Smooth Wheeled Roller

• This type of roller consists of a large steel drum in front and one or two wheels or drum on the rear end.
• 根据后方的车轮数量，可以以下两种类型：

1. 串联滚筒（后部有一个轮子，前面有一个轮子）
2. 三轮滚轮s (having two wheel at rear and one in front)

• 这串联辊的重量varies from2to 8 tonnesand that oftwo wheeled rollervaries from8 to 10 tonnes.

  

• Itground coverageprovided by smooth wheeled roller is100％。
• 这weight of the roller can be increased by filling the inside space of the drum with water or wet sand. This is called压载。
• 这地面压力exerted by tandem rollers is about10 to 17 kg/cm²。
• 光滑轮辊的性能取决于每厘米宽度和滚动直径的负载。
• 光滑的轮辊的速度和通过数取决于要压实的土壤类型和项目要求。这optimum working speed has found to be 3 to 6 km/h和新利18体育官网登录8次足以压实20厘米层。
• 光滑的轮辊最适合合并石材溶质，砾石，沙子，硬芯，镇流器和表面敷料。不适合合并路堤和柔软的子级，但比其他任何其他植物都更适合压实粉质和沙质土壤，并且通过较少。当水分含量远远超过最佳含量时，它将更容易紧凑。
• 两种类型（即蒸汽和柴油）非常相似，差异主要在动力单元中。有可调节的重量设备可以安装在车轮上，以便可以改变滚动压力以满足不同的合并要求。当从事繁重的工作时，滑动重量必须始终位于辊子的后部。当滚筒处于梯度上时，绝对不能移动滑动重量。
• 这steam road roller can stand heavier wear and tear and is much simpler to work than the diesel roller but it takes over an hour to start up and cannot be temporarily shut off, while the diesel type can be started up and shut down in a few minutes and does not consume fuel when standing temporarily idle on a job. Steam road rollers are now getting outdated. Diesel rollers are cheaper in running cost.
• Some rollers are made with its prime movers or engine as a separate unit which is a tractor, and is mounted on the roller, and which has its own advantages.
• 拾荒者提供对所有车轮在调整able positions covering the full width of the roll, with water sprinkling arrangement, for scraping of the mud and keeping the wheels clean during rolling.
• 这maximum grade a road roller can climb is 1 in 5.

5。振动辊

• 这种类型的滚筒装有一个或两个平滑的表面钢轮，直径为0.9 m至1.5 m，宽1.2 m至1.8 m。
• Self propelled vibratory rollers are now available weighing from4 to 6 tonnes。
• 振动是通过内部偏心轴的旋转而产生的。
• 振动压路机是用于压实颗粒base courses. It is sometimes used for asphaltic concrete work.

6。网格辊

• 这se rollers have a cylindrical heavy steel surface consisting of a network of steel bars forming a grid with squire holes and may be ballasted with concrete blocks.
• 他们通常是拖曳单元，可以以速度运行5 and 24 km/h。
• Typical weights vary between5吨网and15 tonnes ballasted。
• 网格辊提供high contact pressurebut little kneading action and are suitable for compacting most coarse grained soils.