Advantages and disadvantages of Rotary Drilling Rig construction
Time：2018-1-4 18:31:37 Click：9483
1. Advantages of the construction of a rotary pile-excavator
(1) quick construction speed. Because rotating drill construction by with a valve at the bottom of the rotary drum type bit broken rock and soil, and it directly into the drill in the elevator to the ground, don't need to geotechnical grated on mud return out of the hole, can be up to 50 cm in footage per minute on average. The construction efficiency can be increased by 5 ~ 6 times in the suitable formation.
(2) construction accuracy is relatively high. The construction process can be controlled by the fuselage computer, such as depth of pile, vertical degree, drilling pressure and filling capacity of drilling tube.
(3) small noise. The noise from the construction of the rotary drill mainly comes from the sound of the fuselage engine, and the rest of the machine has little friction, which is especially suitable for use in urban or residential areas.
(4) environmental protection. Rotating drill construction less dosage of mud, mud in the construction process of the main effect is to increase the stability of hole wall, even in the region of the soil stability better can use water instead of mud drilling construction, greatly reducing the emissions of mud, the relatively small impact on the environment, at the same time to save the cost of mud sinotrans.
(5) it can walk on its own and easy to move. As long as the load-bearing capacity can meet the demand of the rotary drilling rig, it can move on its own by itself without any other mechanical cooperation.
(6) the degree of mechanization is high. The construction process does not need to be removed and assembled manually, without the need for mud cleaning and slag treatment, which can reduce the labor intensity of the workers and save human resources.
(7) no power supply is provided. Using rotating drill are on the market at present USES the fuselage power diesel engine, the construction site without electricity, especially, at the same time also save for the hauling cable layout and protection, security is relatively high.
(8) under the same conditions, the bearing capacity of single pile is higher than that of bored pile. Due to rotating drill on cylinder base Angle blade cutting soil into hole, hole after hole wall is coarser, compared to drilling pile hole wall almost no mud apply effect, the combination of pile and soil pile degree is higher, relatively higher bearing capacity of single pile.
(9) the application of strata is extensive. If the rotating drill construction process for the corresponding technical control, due to the diversity of the rotating drill bit configuration, rotating drill can apply to various stratum, all in the same pile construction process can be completed by rotating drill, don't need to choose other mechanical fit into a hole.
(10) easy to manage. Characteristics due to the rotating drill, drill, compared to the required mechanical punching pile construction process and greatly reduced, and electricity demand is not high, from the management Angle, easy to manage and save the management cost.
2. Disadvantages of the construction of rotary excavator pile
(1) the upfront investment is relatively large. If the purchase equipment, one-time input is large.
(2) self-importance and strict site requirements. Rotating drill self-respect is in commonly 70 t about working status, but the crawler and the ground contact area is about 7.0 m2, so the requirements of the foundation bearing capacity in 100 kpa, particularly in filling area, if there is no hardening or change the surface processing, surface water is rich or rainy season construction to careful consideration, taking the construction of the rotating drill just switching is very difficult, serious waste of mechanical advantage.
(3) poor wall protection. Due to the fast drilling speed of rotary drilling rig, it is mainly used to drill through the cutting soil. Especially in the land filling and soft soil layer, the hole and shrinkage are easy to occur and should be given attention. The construction of filling soil and soft soil should control the speed of drilling. As far as possible, the drilling should be reduced as much as possible, so as to meet the requirements of protecting the wall. Meanwhile, in the soft soil, the construction should be carried out into the drill, and the depth should not be too large.
(4) need mechanical cooperation. Due to the structure characteristics of rotating drill hole after the installation of reinforcing cage and concrete pouring cannot complete by oneself, there must be other hoisting machinery, which produced during process and dig holes must have other earthmoving machinery to dig with, or after the spoilbank is high will directly affect the construction of rotating drill.
(5) it is easy to generate negative pressure inside the hole in the soft soil. Rotating drill drill cylinder and soil contact surface is larger, if drill footage in the soft soil, drill pipe ascension process easy to produce negative pressure, increase in rotary digging pile on the body weight of pull at the same time have an adverse effect on the stability of hole wall, easy to form a wall of hole shrinkage.
(6) short-term investment in construction process increased. Because rotating drill construction speed, short term investment is needed of the cost of material is bigger, the construction unit should combine project funding operation situation, project time limit as prescribed by the contract and relevant disciplinary situation synthetically consider and choose.
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