|
|
May 27, 2019 AE-08 Replacement: Gallery Techniques (Heading) - Part III - Limiting Conditions BE-15 Replacement: Gallery Techniques (Heading) - Part III - Limiting conditions This lecture deals with the application fields and limits of gallery techniques (heading), the measures of quality assurance as well as the advantages and disadvantages of this process. |
||
|
|
|
||
|
|
(Table: Material restrictions for gallery techniques (heading)) |
||
|
|
(Table: Material restrictions for gallery techniques (heading)) |
||
|
|
|||
|
|
|
||
|
|
|
||
|
|
(Image: Documentation) Parallel to the ongoing construction measurement of the gallery, geotechnical measurements should be carried out before and during the construction process in order to confirm the positional stability of the gallery during the heading process. This is needed to detect potential ground deformations and to determine the effects on adjacent buildings. Surface levelings are suited for measurement methods to detect advancing or trailing … |
||
|
|
(Image: Documentation) For the verification of the quality assurance of the applied materials and accomplished works, a QA-manual should be established by the contractor. The QA-manual should contain the following indications and verifications:
|
||
|
|
|||
|
|
Advantages of gallery techniques (heading):
Disadvantages of gallery techniques (heading):
|
||
|
|
|||
|
|
May 27, 2019 AE-08 Replacement: Gallery Techniques (Heading) - Part III - Limiting Conditions BE-15 Replacement: Gallery Techniques (Heading) - Part III - Limiting conditions Congratulations! You have successfully finished this lesson. 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 lessons if you wish to review a specific point or subject. Stay curious! |
||
|
|
May 27, 2019 This module focuses on the fundamentals of the trenchless replacement of gas, water, wastewater pipelines using the gallery techniques known from the mining industry. In addition, the individual steps of the gallery heading process with steel and timber support are described - from the preparatory measures to the final work. In addition, the areas of application and limitations of gallery heading, the measures for quality assurance as well as the advantages and disadvantages of this method are presented. After completing this module, you will have a sound knowledge of:
|
||
|
|
(Image: Sequence of operations work flow for pipe bursting) |
||
|
|
(Image: Condition acquisition of a sewer via CCTV-inspection) (Image: Maintaining the drainage capability) (Image: Exposing a lateral connection using the open cut method as part of the bursting process) Pre-construction survey: The pre-construction survey includes a walkthrough at ground level of the pipeline sections to be replaced, to determe the location of existing pipelines and utilities in the surrounding area, as well as acquiring a visual assessment … |
||
|
|
Pipeline cleaning, and removal of obstructions: Pipeline cleaning is not a required process as long as the pulling-in of the winch cable or the pulling rods is possible. If there are any obstructions preventing equipment access, e.g. pipe collapse, positional deviations, roots, etc., the pipeline must be cleared of such obstacles first. Preparation of the manholes: The manhole invert and connection areas must be prepared or modified in such a way that … |
||
|
|
(Image: Documentation) Upon arrival at the construction site, the pipes are to be inspected for defects and damages. In addition, the delivery papers must be checked to ensure that the product corresponds with the original order details. These checks must be documented as part of the quality assurance procedure. (Image: HDPE discrete long pipes DA 20 in (500 mm)) |
||
|
|
(Image: Bursting head with a directional guide) Pipe bursting procedure: Installation of the new pipeline while considering permissible tensile forces and bending radii. There must be an overlap between the external diameter of the expander head and that of the new pipeline in order to reduce the frictional forces during the pulling through procedure. In other words, the expander head will have a larger diameter than the new pipe that will be pulled … |
||
|
|
(Image: Realisation of pipe bursting from the insertion manhole to the reception manhole) Manhole to manhole: Utilization of segmental pipes and bursting equipment suited to the size of the manhole structure. (Image: Realisation of pipe bursting from the insertion manhole to the reception pit) Manhole to pit: Utilization of segmental pipes and bursting equipment suited to the size of the manhole structure. Installation of the pulling equipment in the … |
||
|
|
(Image: Realisation of pipe bursting from the insertion pit to the reception manhole) Insertion pit to manhole: Installation of the pulling equipment in the manhole or above it. Either the segmental or the continuous pipeline, together with the bursting unit, are introduced through the insertion pit. The size of the bursting unit is accordingly dimensioned as to allow for its removal from the target manhole. (Image: Realisation of pipe bursting from … |
||
|
|
(Image: Connection of the new pipeline to the manhole) Connection of the new pipeline to the manhole: The connection between the new pipeline and the manhole structure must be properly sealed so that water cannot infiltrate the surrounding soil. A leak-tight joint must be placed between the manhole wall and the new pipe. The manhole channel and benching must be fitted to the new pipeline. (Image: Re-connection of a lateral to the new pipeline with the … |
||
|
|
|||
|
|
|||
|
|
May 13, 2020 (Image: Gravity pipeline) The following materials are commonly used in the manufacturing of gravity, protection and product, pipes. (Table: Commonly used types of new pipelines for the pipe bursting of gravity systems with reference to [DWAM143-15]) |
744 search results:
