When a recycled object comes out, the use value it produces will be in contradiction with the object that is similar to its use value, but this contradiction will produce a comparison of advantages and disadvantages, and then from this kind of comparison to make people choose their own form. In the construction machinery, the low headroom rotary drilling rig has been widely used in it, and the speed of its hole-forming operation is understandable. Compared with the traditional front and back circulation system drilling rig, rotary drilling rig has the following innovations:

(1) The construction speed is faster. The low headroom rotary drilling lessor introduced that because the rotary drilling rig is constructed by rotating the cylindrical twist drill with a hanging plate at the bottom to crush the geotechnical engineering, and immediately put it into the drilling bucket and lift it to the road surface, there is no need to minch the geotechnical engineering and return it to the outside of the hole by mud, and the average water inflow per minute can reach about 50cm. Construction of high efficiency in the same period for the geological structure compared to drilling, punching pile machine can be increased by 5-6 times.

(2) the construction precision is very high. During the whole construction process, the pile depth, vertical angle, drilling pressure and the volume of soil in the drill pipe can be controlled by the whole body computer.

(3) the noise is small. The noise of rotary drilling rig construction mainly comes from the sound of the whole fuselage engine, and other components basically have no squeak, which is very suitable for application in urban or residential areas.

(4) It is beneficial to environmental protection. The amount of mud used in the construction of rotary drilling rigs is particularly small. The main function of mud in the construction link depends on the stability of the lifting hole edge. Even in areas with better reliability of the soil layer, tap water can be used to replace mud drilling construction, which greatly reduces the discharge of mud, has a very small effect on the surrounding environment, and at the same time saves the cost of mud transportation.

(5) You can walk around by yourself, and the machine is convenient to install and move. Only the bearing capacity of the site can meet the weight requirement of the rotary drilling rig, and it can move by itself by crawler type without other mechanical cooperation.

(6) the level of mechanization is very high. During the whole construction process, there is no need to manually carry out the disassembly and assembly of drilling tools, and no need to carry out mud removal management, etc., which can reduce the labor efficiency of workers and save human resources management at the same time.

(7) Under the same conditions, the bearing capacity of single pile is higher than that of bored pile. Because the rotary drilling rig cuts the soil into a pile by the edge of the simple bottom edge, the hole edge is not smooth after the pile is formed, and there is basically no mud "wiping" effect on the hole edge of the same bored pile. After the pile is formed, the fusion level of the pile body and the sand soil is very high, and the bearing capacity of the single pile is relatively high.

(8) the available geological structure is common. If certain technical manipulation is carried out in the whole construction process of the rotary drilling rig, because the rotary drilling rig is equipped with twist drills, the rotary drilling rig can be applied to various geological structures, and the whole construction process of the same pile can be carried out by the rotary drilling rig without using other machinery to form piles.

(9) Facilitate management methods. Because of the advantages of the rotary drilling rig itself, the mechanical equipment and management required for drilling and punching pile construction are greatly reduced during the same period. At the same time, the power consumption requirements are lower. From the perspective of management methods, it is convenient to manage and save labor costs.