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May 04, 2020 |
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Experience gathered at sites [Reith98] has shown that they are at their best in cohesive soils with a large percentage of particle sizes < 0.5 mm. The main advantages here are economic as the separation plants required with hydraulic spoil removal for separating the slurry are less effective in this size range. Area of application of microtunnelling with pneumatic spoil removal:
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The jacking performance of microtunnelling with pneumatic spoil removal is subject to the following influence:
(Image: … |
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May 04, 2020 |
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Nowadays this method, which was originally developed for the nominal size range from DN/ID 400 (16 in), is only used in the nominal size range 800 mm (32 in) ≤ DN/ID ≤ 2750 mm (108 in) (from a clear width > 1200 mm (48 in) referred to as manned pipe jacking). It is therefore ideally suitable for very soft, cohesive clay with a clay concentration of ≥ 40% and one-axial uniaxial compressive strengths ≤ 0.05 N/mm2. (Image: Conveying of soil with the … |
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May 04, 2020 |
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May 04, 2020 |
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May 04, 2020 Micro tunnelling refers to unmanned, remote-controlled methods for jacking pipes.
This module covers the various methods, in particular, micro tunnelling with hydraulic, pneumatic, auger and scraper conveyance and soil displacement. The focus is on single- and two-phase micro tunnelling, the technical components in micro tunnelling and areas of application.
After completion of this module, you will have a sound knowledge of:
- spectrum of process technologies;
- machine and control components and
- their functions;
- advantages and disadvantages as well as
- areas of application.
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What is pipe replacement? It is the construction of a new pipeline, on or off the line of an already existing pipeline, incorporating all its functions. The replacement is carried out in section lengths of the sewer using: Open Cut Method (Image: Replacement of sewers using the open cut method) Semi Open Cut Method (Image: Replacement of a masonry sewer by the semi open cut method of construction [Karna94] - Excavating the masonry sewer from the cutting … |
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(Image: Overview of replacement methods in trenchless construction) *) Only the pilot boring is steerable in this method. The expansion boring and the following pulling-in or pushing-in of the pipes are non-steerable. |
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It is important to learn the following pipe bursting terms [DWA-M143-15]:
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May 13, 2020 |
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The following guidelines can be referenced for pipe bursting method: The International Pipe Bursting Association (IPBA) [Guideline Specifications for the Replacement of Mainline Sewer Pipes By Pipe Bursting ] The Trenchless Technology Center (TTC) [Guidelines for pipe bursting- TTC Report] Plastics Pipe Institute Handbook of PE Pipe Second Edition. Chapter 16, Pipe Bursting. Pipe Bursting Projects (ASCE Manuals and Reports on Engineering Practice No. 112) |
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The following European standards are also a good reference: DIN EN 752-5: Drain and sewer systems outside buildings (2008-04) DIN EN 12889: Trenchless construction and testing of drains and sewers (2000-03) German regulations that address pipe bursting: DWA-M 143-15: Rehabilitation of drain and sewer systems outside buildings, Part 15: Replacement of drains and sewer with pipe bursting / not available in English at the present Some other German regulations … |
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(Image: Replacement by trenchless method) Pipe bursting is an environmentally friendly technology used for in situ trenchless replacement of drains and sewers (pipelines) by applying pneumatic, hydraulic and static energy to fracture and radially displace the host pipeline into the surrounding soil. The replacement pipeline, which can be of similar or larger nominal size, is pulled or pushed in simultaneously. |
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The basic principle behind pipe bursting, developed in the 1980's, is to pull a bursting head with a winch cable or a tension rod through the host pipeline, which has been taken out of service, and to break/burst the pipe walling from the inside and force it radially into the surrounding soil. A new pipeline (casing or product pipeline) which has the same or a larger nominal size is pulled in directly behind the bursting head. Consequently, no soil … |
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Pipe bursting forces are generated using the following three methods: Static (Video: Static pipe bursting) Hydraulic (Video: Hydraulic pipe bursting) Pneumatic (Video: Pneumatic pipe bursting) |
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Static pipe bursting Pulling-in of the new pipeline using only a winch cable or pulling chain and/or pulling- and pushing-rod with accordant pulling equipment in the target manhole / reception pit. Hydraulic pipe bursting There are two options: (1) Pulling-in of the new pipeline using a winch cable … |
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