Different Types of Scrapers Used in TBM Construction
This module explores various types of scrapers utilized in the construction of Tunnel Boring Machines (TBMs). The scrapers are designed to handle different geological conditions and are equipped with tungsten carbide bits for improved performance and longevity. Different types such as Centre Scraper, Face Scraper, and Bucket Scraper are discussed in detail, along with their specific applications and features. Enhance your understanding of these essential components used in TBM construction.
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Presentation Transcript
Bultains: Title: Different Types of Scrapers Sensitivity: LNT Construction Internal Use
Different Types Of Scrapers Introductions This module will look at the different types of scrapers used in the cutter head, According to different geological condition design the different shape and choose the most suitable tungsten carbides, in order to make sure the cutters can deal with various working conditions, no matter the silty sand or the sandy gravel, our mission is to reduce the replacing frequency and improve work efficiency. The hardness after heat treatment is HRC 40 3 it has a pretty high wear resistance and toughness Sensitivity: LNT Construction Internal Use
Different Types Of Scrapers Centre scraper Centre scraper Face scraper Bucket/Outer scraper Face scraper Face scraper Sensitivity: LNT Construction Internal Use
Different Types Of Scrapers Centre scraper-1:- 1. This type of scraper mostly used for soft ground geology 2. Scraper up to 15 mpa rock can be cut. Also, we call ripper this type of scrapper 3. Scraper front side installed tungsten carbide bit. 4. This scraper can be mounted at single and double cutter housing with high - grade bolts In the cutter head structure Centre scraper-1 Centre scraper-2:- 1. Mostly they are using this type of scraper micro- tunnelling 2. This type of scraper used only soft soil ground (silty, sand) 3. For wearing purpose Scraper front side welded with hard facing welding. 4. Scraper welded in the cutter head centre position Centre scraper-2 Sensitivity: LNT Construction Internal Use
Different Types Of Scrapers Face scraper-1: 1. This type of scraper up to 15Mpa rock can be cut. 2. Scraper front side installed tungsten carbide bit. 3. This scraper mounted with higher strength multiple bolts in the cutter head structure. 4. The bolts (Allen key) strength is 12.9 grade. Face scraper-1 Face scraper or cutting Knife-2: 1. This type of scraper up to 10Mpa rock can be cut. 2. Scraper front side installed tungsten carbide bit. 3. This scraper mounted with single higher strength bolts in the cutter head structure 4. Bolt s strength is 12.9 grade. Face scraper-2 Sensitivity: LNT Construction Internal Use
Different Types Of Scrapers Bucket scraper: 1. This Bucket type of scraper up to 15Mpa rock can be cut. 2. These type of scrapers are positioned on the very far edge of the TBM cutter head, this ensures that the rotating cutter-head cuts material to circa 35mm larger than the TBM main body. This is to prevent the TBM becoming stuck and assists with steering of the TBM 3. This type of scraper used all types of TBM (EPB, Slurry, Hard rock) 4. Scraper front side installed tungsten carbide bit. 5. This scraper mounted with Hexagonal bolts in the cutter head structure 6. The bolt s strength is 10.9 grade. Bucket/Outer scraper Sensitivity: LNT Construction Internal Use
End Sensitivity: LNT Construction Internal Use