Home page

How To Choose The Drill Tools Base On Different Construction Site

Release time:

2021-11-12

Author:

Source:

Abstract

Rotary drilling rigs are the most common equipment in current piling construction. Since the geological conditions of each place are

Rotary drilling rigs are the most common equipment in current piling construction. Since the geological conditions of each place are different, how to choose the appropriate drill bit during the piling process has become a key issue. Today we will teach how to select appropriate rotary drilling rig drill bits and drill teeth，after understanding the geological characteristics of the construction site

Drill tools
1. Soil layer double bottom bucket :
It is suitable for silt, fine sand, silt, silty clay, clay, and some soft soil types, such as completely, strongly weathered and weathered mudstone, muddy sandstone, etc. It is the most widely used drill tools in the industry.

2. Rock-embedded double bottom bucket :
Suitable for egg and gravel layers, weathered soil-like soft rocks, such as weathered argillaceous sandstone, argillaceous conglomerate, and harder rocks with higher degree of weathering, such as fully and strongly weathered granite. When drilling hard rock, it is often necessary to use core barrel and rock auger .

3. Core Barrel :
It is suitable for circumferential cutting of moderately weathered sandstone with obvious layering (high probability of coring) and hard rock formations. In soil layers with high density or some soft rock formations, when friction-type drill pipes are selected to cause slippage, you can try to use barrel drills.

4. Centrifugal bucket :
The Centrifugal bucket is used to realize automatic opening. The cylinder and the bottom plate are connected as one. When drilling, the two-flap cylinder is closed. After lifting the drill, the two-flap cylinder is opened and the clay drilling residue falls naturally, reducing the time and time of soil throwing. It has the advantages of fast drilling speed and convenient soil dumping.

In the early days of its produce, the centrifugal bucket bucket was mainly used in clay layers that were difficult to dump. Now its scope of application has expanded to sedimentary rocks and fully weathered rocks with lower strength.

5. Rock-embedded drill auger:
It is suitable for crushing hard rock formations such as boulders and boulders in the hole. For some cement formations and medium-density pebble soil, when the double-bottomed bucket cannot be used to drill, you can try to use a auger t to drill

6. Double-layer core barrel:
It is suitable for drilling into boulder layers with a particle size of 200 to 500mm. The double-layer core barrel adopts a brand-new drilling idea: “squeezing”. That means crushed and pebbles of different sizes are squeezed in the cylinder and brought out of the hole. During design, the outer diamete rcylinder is designed based on the diameter of the pile hole, and the inner diameter cylinder is designed based on the average particle size of the pebbles. The inner cylinder is taller than the outer cylinder. This drilling tool has been widely used in World, and its drilling efficiency and drill tooth loss are significantly better than other drilling tools.

7. soil layer single bottom bucket:
This drill bit has similar functions to the double-bottom bucket. The advantage is that it has a side soil inlet and does not need to be reversed to close the bucket door, so it is more efficient in drilling soil layers. Due to its light weight, the single bottom bucket may slip and fail to penetrate some hard soil layers, especially when used with friction kelly bar, that will affect the drilling efficiency.

8. Soil auger:
It is only suitable for large cohesion clay layers with small pile diameter The advantage is that the maximum height of the drill bit can reach 4m, the amount of footage in a single time is large, and it can effectively avoid the problem of difficulty in unloading slag with other drill bits in such projects. It is recommended to use it within the applicable projects.

9. Double bottom single cut bucket:
Generally, the diameter is ≤1.2m. Compared with the double-bottom double-cut bucket, it has a larger single-side soil inlet, which is more conducive to drilling in some formations, such as pebble formations with a particle size of less than 200mm. However, due to the asymmetric structure of the single door, there are higher requirements for design or production, otherwise the phenomenon of partial holes will easily occur. This type of drill bucket can be used for drilling pebble formations with small pile diameters ≤1.2m.

10. Bottom expansion drill tools:
On the basis that the pile diameter does not increase and the pile depth does not increase, in order to improve the bearing capacity of a single pile, the design unit often achieves it by expanding the base of the pile. The base expansion of the rotary drilling rig can be constructed without any modification. Just choose the base expansion. Just drill.

The most commonly used base expansion drill tools are mechanical ones. This type of drill tools is relatively simple to use and maintain. There are top-opening and bottom-opening types. The opening mechanism is usually a four-link. It is used in soil layers, strongly weathered, and moderated strata. . Since rotary drilling is non-circulatory drilling, just use a slag cleaning bucket to clean the slag after the bottom expansion is completed

Key words:

None

How To Solve The Problem Of Deep Pile Construction?

1

Tel： +86-731-86800281

Whatsapp：+86-15273167776
Mailbox： info@zhizhuogloves.com

Headquarters: No.49 Kaiyuan Road,Xingsha Economic Developing Zone,Changsha,Hunan Province,China

WeChat

Business license