Segmental casings are widely used during construction work of rotary drilling rigs, but many people don’t know what is it and what does it used for? Let’s explore that in this article.

Casing we also call it segmented casing, temporary casing, usually double casing and single casing types, usually with rotary digging construction drilling work used. What kind of material is this temporary casing made of? Is it hard, strong and wear-resistant? Rotary casing is a kind of steel pipe, mainly used to protect the safety of the surrounding soil and buildings when digging deep foundation pits. It is usually made of high-strength steel, such as Q345D or Q390D steel. Rotary digging casing can be divided into two types according to the different installation methods, they’re ‌pile casing‌ and ‌foundation casing. How do those two kinds of segmental casing work?

Pile casings are used to drive the casing section by section into the soil layer and connect the casing to form the pile when drilling the borehole to the design depth. Suitable for all kinds of large and small building foundations, railways, highways, tunnels, underground pipelines, bridges and other engineering infrastructure. While foundation casings are used to protect the surrounding soil and building safety during deep foundation pit excavation. Its inner diameter is larger than pile casing. It is usually installed inside pile casing and used, and the casing is pressed to different depths according to design requirements. The installation methods of foundation casing are generally sunk tube, pushing and digging. They are made of high-strength steel, such as Q345D or Q390D steel, strong enough during drilling and digging.

Then why does this steel casing become segmented casing? Let’s explore it. As we all know, many construction sites need to drill holes or drilling, whether we build high-rise buildings, build high-speed railway, build submarine tunnel, build lake tunnel, build airport, build high-speed way, build port and other different construction scenes, all need to drill holes. The diameter of the hole, the depth of the hole needed are not the same. Under this premise, manufacturers cannot produce a same long length or a same big diameter of casing to meet the use of different construction scenarios. However, in order to ensure the smooth completion of foundation construction drilling, casing manufacturers similar to us ZEYUE MACHINERY will produce segmented casing with different diameters and lengths to meet the construction requirements of our different customers. Whether our customers need to drive 2 meters deep or 20 meters of holes, we can adjust the length of the segment casing to achieve it.

So what are the parts usually contained in the segmented casing? In order to meet the customer's requirements for drilling depth and diameter, we divide the segmented casing into different parts such as casing adaptor, casing connector, casing joints, regulating casing, casing tubes and cutting cutting shoe. Through the composition of these parts, with different types of rotary digging supporting use, adjust the length of the casing, to achieve the final required drilling hole length. That’s why the casings are called as segmental casings.

After knowing why segmented casings are called segmented casings and their composition, we are interested in how such segmented casings work and why they must be used. Different models and different brands of rotary drilling have some necessary drilling tools, such as square drill, auger, mechanical resistance rod, kelly bars and other drilling tools. But the depth of these drilling tools and the speed of drilling are limited, then it is necessary to use our steel casing to improve the efficiency of rotary drilling, improve safety rate, success rate and save drilling costs. We know there are so many advantages while using wall casings during foundation drilling, how does the segmental casing works? Casing rotary digging is a kind of technology that the casing is fixed on the ground, and then the rotary excavator is used to drill or shovel into, so as to form a drilling or digging hole. Compared with the traditional straight drilling process, its advantages are a lot. First of all, as the casing can control the diameter and perpendicularity of the hole, improve the quality and stability of the hole wall. Besides, casing can avoid hole collapse and ensure construction safety as the self-weight of the casing steel pipe and the lateral pressure of the surrounding soil can improve the speed and success rate of hole drilling. In the actual construction of foundation engineering, casing rotary digging is widely used in the following aspects including foundation treatment, such as soft soil foundation treatment of cast-in-place piles, drilled piles, etc. And consolidation grouting, such as supporting piles and retaining piles in deep foundation pits. Also working on underground pipeline layout, such as tunnels and pipeline tunnels in municipal water supply and drainage projects.

Let’s get a conclusion that segmental casings are necessary and important during foundation drilling working, if you need high quality of the wall casings welcome contact us at any time.