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For pipes without the integrated base, the bedding angle (2α) is usually set between 90 ° and 180 °. For pipes with the integrated base, the bedding angle is normally 60 °. (Image: Variable support angle (2α) in pipe without a base) (Image: Variable support angle in pipe with a base) |
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(Image: Influence of the support angle on the pipe stress) What is the impact of a decreasing bedding angle? Influence of the bedding angle on the pipe stress.
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Incorrect:
Result: load concentration Correct:
Result: good load distribution (Image: Load concentration due to an unfavorable compaction ratio between the trench base and subbase) (Image: Good load distribution as a result of a favourable compaction ratio between the trench base and subbase) |
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(Image: Effects of uneven longitudinal load distribution) What kind of impact have highly compacted bedding areas? Highly compacted areas within the bedding layer lead to the formation of point loads (shown dotted thickly here) resulting in the cracking of the pipe. |
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Congratulations! You have successfully finished this module. Next, you will have the opportunity to review the newly acquired knowledge with an interactive questionnaire. You can, of course, still navigate back to any point in the modules if you wish to review a specific subject. Stay curious! |
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Jan 31, 2023 The embedment consists of bedding, side filling and initial and main cover. The quality of the embedment is significantly influenced by the installation conditions of the pipes. Other topics of this module include flowable fill for trench backfill, optimized installation methods and compaction tests. After completing this module, you will have a sound knowledge of:
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Nov 21, 2017 (Image: Rehabilitation) Rehabilitation includes a wide range of measures for restoring or upgrading the performance of existing drain and sewer systems. |
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Nov 21, 2017 In the following, particlar emphasis will be placed on structural rehabilitation. Structural rehabilitation includes technical solutions which can support total internal and external loads. Rehabilitation can be carried out by:
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Nov 21, 2017 Degree of use of the host pipeline Depending on the type of rehabilitation within the trenchless method, the existing fabric of sewer (substance of the host pipeline) is fully used, partially used or not used at all. (Image: Repair) (Image: Renovation) (Image: Replacement) Repair: Full or partial use of the host pipeline Renovation: Full or partial use of the host pipeline Replacement: No use of the host pipeline |
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Nov 21, 2017 Definitions: (Image: Repair) (Image: Lining with site manufactured pipes) (Image: Replacement by trenchless method) Repair: Rectification of local defects Renovation: Work incorporating all or part of the host pipline or sewer by means of which its current performance is improved Replacement: Construction of a new pipeline or sewer, on or off the line of an existing one, the function of the new pipeline or sewer incorporating that of the old |
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Nov 21, 2017 (Image: Attention!) Often it is more cost effective to repair localised defects, referred to as point repair. Multiple point repair and/or extensive defects can be rehabilitated either by renovation or by replacement. If hydraulic overloading or a reduction in cross section caused by renovation measures cannot be accepted, then only replacement comes into question. (Image: Locally limited damage) (Image: Repeated and extensive damage) (Image: Hydraulic … |
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Nov 21, 2017 (Image: Decision process for the selection of structural solutions with reference to DIN EN 752-5 [DINEN752-5b]) Decision process for the selection of structural solutions with reference to DIN EN 752 [ [EN752-5:1997]] |
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Nov 21, 2017
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Nov 21, 2017 The processes for structural rehabilitation comprise several main groups. The technical solutions involve numerous special processes. Those processes can be catagorised into the following groups. (Image: Overview of the main processing groups for the structural rehabilitation of drain and sewer systems) |
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Nov 21, 2017 The lining process is often referred to as a relining process. It provides full support from manhole to manhole. (Image: Lining with prefabricated pipes) (Image: Lining with site manufactured pipes) (Image: Lining with site manufactured and hardened pipes) |
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Nov 21, 2017 |
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Nov 21, 2017 The following rehabilitation method involves site manufactured pipes. It is based exclusively on the spiral wound lining, which is also called lining with spirally-wound pipes in EN ISO 11296-7. Characteristic of this process group is the manufacturing of a self-supporting statically stable liner on site by utilizing a specially designed winding machine
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Nov 21, 2017 The spirally-wound pipe is a pipe which is manufactured by continous wounding and assembling of a profiled plastics strip (plastics profile). It is produced with an integrated connection while being introduced into the pipe to be renovated at the same time. The form-fitting assembly of the plastics profile is performed with a tongue-and-groove joint, which is formed depending on the process and which can additionally be (cold) welded or sealed. (Image: … |
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Nov 22, 2017 |
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Nov 22, 2017 |
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Nov 22, 2017 During the expansion process the main lock serves as a guide. Later, in conjunction with a silicone, it performs the sealing function of the profile connection [DWA-M 143-9:2019-11]. A (cold) welding of the profile connection is not possible with this installation method. The silicone is already introduced in the area of the main lock during the winding process. The hardening time must be adjusted in a way the silicone hardens only after completion … |
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Nov 22, 2017 When the spirally-wound pipe reaches the target manhole, the expansion process shall be initiated. For this purpose, the spirally-wound pipe must be fixed against rotation in the target manhole and the winding process with simultaneous unlocking of the assembly lock by pulling the cutting wire from the starting manhole progressively continues until the spirally-wound pipe is flush with the inner wall of the sewer section to be rehabilitated or respectively … |
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