A Self-Learning Manual - Institution of Engineers Mauritius

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A Self-Learning Manual Mastering Different Fields of Civil Engineering Works (VC-Q&A Method) Vincent T. H. CHU 18. In concrete pipe joint for pipe jacking, butt end type with mild steel band and socketed in-wall rubber ring type are commonly used. Which one is better? Butt end type with mild steel band is commonly used for stormwater application. The mild steel band serves to prevent lateral displacement if pipe joint during pipe jacking. Socketed in-wall rubber ring type is normally used for sewer and pressure pipe situation and for pipe size exceeding 1200mm in diameter. The rubber ring is designed to provide a seal to pipe joint to ensure watertightness, which is essential in sewage pipelines. Fig. Butt end type with mild steel band and socketed in-wall rubber ring type 334
A Self-Learning Manual Mastering Different Fields of Civil Engineering Works (VC-Q&A Method) Vincent T. H. CHU Level One (Core FAQs) Part II: Pipe Ramming and Microtunneling 1. What is the difference between pipe jacking and micro-tunneling? (M1) Pipe jacking is a general technique of the installation of pipes with a tunneling shield in front and the pipes are jacked from a jacking pit to a receiving pit. The tunneling shield for pipe jacking can be electrical and mechanical equipment for conducting the excavation work or it can be a manual shield for workers going inside the shield to carry out manual excavation. For microtunneling, it is a kind of pipe jacking of small sized non-man-entry pipes which are remotely controlled. In general, there are two common types of micro-tunneling machines: (iv) Pressurised slurry Similar to the Pressurised slurry TBM, excavated material is transported from the excavation face to the surface suspended in a slurry. (i) Auger machine Excavated material is transported from the excavation face to the drive pit through a cased screw auger. 2. Does microtunneling refer to tunnel size less than 1,000mm? (M1) The international definition of microtunneling includes pipe with diameter up to 1,000mm only. However, in the United States, it allows for larger pipe size when defining microtunneling in which pipe with diameters up to 144 inches are also counted within the ambit of microtunneling. The basic concept of microtunneling has changed gradually owing to recent technological developments and past experience. For instance, the use of alignment control system with advanced surveying techniques allows for longer drives with good control and curved microtunneling. The use of automatic lubrication system enhances lower jacking forces. The employment of gripper in microtunneling machines helps develop adequate loads on cutter discs for cutting rock. 3. What are the situations which warrant the use of microtunneling instead of other trenchless methods? 335
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A Self-Learning Manual - Institution of Engineers Mauritius

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