Views: 0 Author: WU Publish Time: 2024-10-12 Origin: Site
Today, I will share with you the selection of rotary drilling rig and tell you what type of rotary drilling rig is used for what pile hole.
Factors affecting the selection of rotary drilling rig are: pile length, pile diameter, geology and special pile type, pile hole size, depth, geology is simple, complex and soft and hard, seen small pile is 500mm, large pile is 3 meters.
1, small piles can only be hit with small rotary drilling RIGS, such as 130, 150, 160 and other models, because the drill pipe is limited;
2, the 550 type rotary drilling rig can also play 3.5 meters pile holes.
3, the small pile is the drill pipe limit, the large pile is the model limit, the reasonable size of the drill pipe center to the track affects the size of the drill can be installed. Otherwise, even if it is loaded, it cannot be unloaded normally, because the return transfer is interfered with.
4, the common building pile is generally small 600-800 diameter pile. The commonly used model for building piles is about 240 models, which has a certain ability to open rock, and the model is relatively small, and the transfer transportation cost is not high. 600mm pile is generally not recommended to use 280 type, because 280 rotary drilling rig drill rod is 508 drill rod, if occasionally used, play a few shallow pile can also, generally within 20 meters, too deep easy to stick.
5. High-speed rail piles are generally small piles of 1 meter, and it is a rock pile, and the pile depth is 30-50 meters. If this kind of pile is not too hard, it can be played with 240 model, but the project department is generally small enough to let 280 or even at least 360 model, because the project department pursues construction efficiency.
6, 280 model rotary drilling rig is recommended to drive a small diameter of 700mm pile, large pile is generally 2.5 meters. The 360 model is recommended to drive a small diameter of 800mm pile, the large pile is generally 2.8 meters, if it is 508 drill pipe to play 700mm pile can also try. Model 400 is recommended to play a small diameter of 1 meter pile, large pile diameter is generally 3 meters. For the 500 and 550 models, it is recommended to build a small diameter of 1.2 meters, and a large pile diameter of 3.5 meters.
7, pile size, an important factor affecting the selection of equipment is also pile depth. Before saying the pile depth, it is necessary to find out whether the pile type belongs to the end bearing pile or the friction pile.
(1) The end bearing pile generally needs to enter the rock, the rock generally refers to the weathered rock, the depth of the rock is generally 2D, that is, 2 times the diameter. Because this kind of pile involves rock, it is generally necessary to usenecessary to use interlock kelly bar, because the interlock kelly bar has a strong rock opening ability. The number of interlock kelly bar sections is generally relatively small, usually 4 sections, and there are also 5 sections. 5 interlock kelly bar is generally small 530 drill rod, too small maintenance rate is very high. Regarding the pile depth, if it is into the rock pile, once it exceeds 65 meters, it is necessary to pay attention to it, small models are generally not considered, at least more than 360 models, if 360 is used, it is necessary to use 5 interlock kelly bars.
(2) Friction kelly bar generally carry strength through the friction of the side wall, and generally achieve large bearing capacity through large pile diameter and pile depth. Generally do not need to open rock, drill pipe usually use friction kelly bar is good. The friction kelly bar of 280 and above models is generally 6, and the rotary drilling rig below 280 is generally 5. If it is a friction kelly bar, once the pile depth exceeds 100 meters, it should also pay attention to it, because once it exceeds 100 meters, it is generally necessary to have more than 360 rotary drilling RIGS with friction rods, and most of the models above 360 are for opening rock, with fewer friction rods.
Of course, in the pursuit of efficiency, small piles look at the flexibility of rotary drilling rig, deep piles look at its rope lifting speed, and hard piles look at the ability of rotary drilling rig to open rock. However, the large rotary drilling rig has strong rock opening ability and large lifting force, but the fuel consumption is relatively large. Complex geology not only affects the selection, but also requires the casing and even some need to follow up the casing.
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