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簡介：

在疏松的地層鉆進叫做跟管鉆進，比如鉆鑿?fù)寥溃惩?，淤泥，沙土，砂礫和鵝卵石層等，往往會碰到土層跟隨鉆頭塌進孔眼內(nèi)的問題。同心跟管鉆具就是用在這種有砂礫和破碎層的工作條件的，代表著根管鉆具的最新技術(shù)。

同心跟管鉆具由三部分組成：即中心導(dǎo)孔鉆頭，管靴和對心環(huán)形鉆頭。中心導(dǎo)孔鉆頭作用是鉆鑿孔眼中心部位和牽引鉆柱，并與可拋棄的對心環(huán)形鉆頭一起組成一個完整的鉆進鉆頭。管靴通過焊接或螺紋連接著一根套管，隨沖擊器和中心導(dǎo)孔鉆頭的沖擊被牽引入孔內(nèi)。對心環(huán)形鉆頭和管靴組在一起被中心導(dǎo)孔鉆頭鎖定到?jīng)_擊器尾柄上，環(huán)形鉆頭在鉆進中鉆鑿出套管入孔所需而超過中心導(dǎo)孔鉆頭外徑的部分。導(dǎo)孔鉆頭的肩部托著管靴的肩部。潛孔沖擊器的沖擊能量通過導(dǎo)孔鉆頭和環(huán)形鉆頭傳遞、碎巖，部分沖擊能量的作用是將套管推進。在鉆眼和護孔完成后，通過輕輕反轉(zhuǎn)讓卡扣連接解鎖而取回中心導(dǎo)孔鉆頭和鉆柱。環(huán)形鉆頭留則在孔內(nèi)，只有當(dāng)套管拔出時環(huán)形鉆頭才一起取出。而在基巖中，如果需要進一步鉆進就將導(dǎo)孔鉆頭換成普通的鉆頭。

傲石捷的同心跟管鉆具設(shè)計來用于在疏松巖層，可鉆鑿多種尺寸的孔徑，范圍從108毫米到863毫米（4 1/4到34寸），可任意角度施工（包括水平方向），可鉆到任何深度（遠超100米），鉆孔護孔同步進行。排粉槽在套管內(nèi)部和管靴內(nèi)置使得孔眼底部密封性較好，使孔眼周圍散落物堵孔可能性降至最低。這種鉆具使得套管跟進容易，設(shè)備簡化，操作簡單，適用于很多用途，比如微型樁，支柱，錨固，海灘施工和水平鉆進等等。

同心跟管鉆具特征和優(yōu)點：

性能穩(wěn)固可靠

全頭部切削結(jié)構(gòu)，故進尺快、孔眼直

比偏心鉆需要的扭矩更小

可朝垂直、水平或任何方向的作業(yè)

孔眼被填堵的可能性降到最小

排渣高效

解鎖、重新鎖定比較容易

操作容易、安全性好

環(huán)形鉆頭直徑可進行多種選擇，故可滿足多種套管的作業(yè)需求

鉆機作業(yè)中震動小

規(guī)格概覽：

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如何訂購：

跟管內(nèi)徑和外徑 + 環(huán)形鉆頭直徑+ 尾柄設(shè)計 + 導(dǎo)孔鉆頭直徑

General Introduction:

Drilling through loose, unconsolidated material such as soil, clay, silt, sand, gravel, and boulders is the so-called overburden, which is often problematic due to the tendency of the earth to cave in behind the drill bit. The Symmetric Casing Drilling System is just to drill in rock formation where contains some such ovals and fractures, and it represents the latest technology in simultaneous overburden casing drilling systems.

The Symmetric Casing Drilling System consists of three parts: central pilot bit, casing shoe and symmetrical ring bit. The central pilot bit drills away the center part of the hole and guides the drill string, incorporated with a sacrificable symmetrical ring bit make a full face drill bit. The casing shoe is welded or threaded to a casing pipe, which is pulled down by the impact of the DTH hammer and central pilot bit. The symmetrical ring bit and casing shoe assembly is locked into central pilot bit with a hammer shank, and the ring bit is to drill the segment the casing to advance down the hole. The pilot bit’s upper shoulder engages the shoulder of the casing shoe. DTH hammer’s impact energy is transferred through the pilot and ring bits, crushing rock, part of impact energy advances casing. On completion of drilling and casing, the drill string with pilot bit is retrieved by a slight reverse rotation to unlock the bayonet coupling. The ring bit stays in the hole, and can be recovered only if the casing is retrieved. Drilling continues to the desired depth in the bedrock using a conventional drilling.

Acedrills’ Symmetric Casing Drilling System is designed to drill holes of many sizes, ranging from 108 to 863mm (4 1/4 to 34 in), at any angle (including horizontal), to any depth (beyond 100 meters) through unconsolidated formations simultaneously with casing. The internal flushing grooves together with the built-in casing shoes gives a good seal to the button of the drilling hole, and thus minimizing the disruption of the surrounding of the drill hole. It makes the casing follow easy and the equipment and operation simple, and is recommended to a multitude of applications, such as micro-piling, underpinning, anchoring, marine work and horizontal drilling etc..

Symmetric Casing Drilling System Features and Advantages:

Stable and reliable working performance

Full face head design for faster penetration and straighter hole

Less torque is required than eccentric drilling

Can drill in vertical, horizontal or any direction

Minimize disruption to the drilled hole

Effective cuttings removal

Unlocking-relocking easily

Easy to operate and system security

Varied ring bit diameters to suit different casing requirement

The less vibration of drill rig

Specification Overview:

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How to order?

Casing Tube Out Diameter & Inner Diameter + Ring Bit Diameter + Hammer Shank Style + Pilot Bit Diameter