简介：

在疏松的地层钻进叫做跟管钻进，比如钻凿土壤，粘土，淤泥，沙土，砂砾和鹅卵石层等，往往会碰到土层跟随钻头塌进孔眼内的问题。同心跟管钻具就是用在这种有砂砾和破碎层的工作条件的，代表着根管钻具的最新技术。

同心跟管钻具由三部分组成：即中心导孔钻头，管靴和对心环形钻头。中心导孔钻头作用是钻凿孔眼中心部位和牵引钻柱，并与可抛弃的对心环形钻头一起组成一个完整的钻进钻头。管靴通过焊接或螺纹连接着一根套管，随冲击器和中心导孔钻头的冲击被牵引入孔内。对心环形钻头和管靴组在一起被中心导孔钻头锁定到冲击器尾柄上，环形钻头在钻进中钻凿出套管入孔所需而超过中心导孔钻头外径的部分。导孔钻头的肩部托着管靴的肩部。潜孔冲击器的冲击能量通过导孔钻头和环形钻头传递、碎岩，部分冲击能量的作用是将套管推进。在钻眼和护孔完成后，通过轻轻反转让卡扣连接解锁而取回中心导孔钻头和钻柱。环形钻头留则在孔内，只有当套管拔出时环形钻头才一起取出。而在基岩中，如果需要进一步钻进就将导孔钻头换成普通的钻头。

傲石捷的同心跟管钻具设计来用于在疏松岩层，可钻凿多种尺寸的孔径，范围从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），可钻到任何深度（远超100米），钻孔护孔同步进行。排粉槽在套管内部和管靴内置使得孔眼底部密封性较好，使孔眼周围散落物堵孔可能性降至最低。这种钻具使得套管跟进容易，设备简化，操作简单，适用于很多用途，比如微型桩，支柱，锚固，海滩施工和水平钻进等等。

同心跟管钻具特征和优点：

性能稳固可靠

全头部切削结构，故进尺快、孔眼直

比偏心钻需要的扭矩更小

可朝垂直、水平或任何方向的作业

孔眼被填堵的可能性降到最小

排渣高效

解锁、重新锁定比较容易

操作容易、安全性好

环形钻头直径可进行多种选择，故可满足多种套管的作业需求

钻机作业中震动小

规格概览：

如需样本和更多的产品信息，请点击此处，验证您的公司信息，并告知我们您的具体需求。 

如何订购：

跟管内径和外径 + 环形钻头直径+ 尾柄设计 + 导孔钻头直径

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:

For brochure and more product information, please click here to verify your company information and tell us the detail.

How to order?

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