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A large part of the accident and health dangers mentioned in the section "Gunite and gunite mortar" are avoided by the "Ruswroe System" specially developed in England for the coating of sewers [FI-Alpha] [Marti84]. It is based on the wet gunite lining system with the utilisation of a very low pressure (comparable to the application of plaster with plaster spray machines). The mortar used is applied onto a galvanised mesh wire mat with a mesh thickness …
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(Image: Sketch of the principle of an automatic spray machine for dry (right) and wet (left) gunite process for coating large boreholes in the coal mining industry [Großk85]) In order to improve coatings based on the gunite lining process as regards costs, material quality as well as accidents and injuries, present efforts are aimed at mechanisation.
A first attempt in this respect was with the spray machine used in the Pre-load process [Atkin50] …
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(Image: Applying cement grout by spray lining in non-man-accessible sewers - Rotary spray heads with coupled smoothing cones [FI-Heitkb]) The Centriline process or cement mortar coating with the spray lining process was developed specially for water supply pipes or pipelines of steel or cast iron. Even today, this is the main use of the application for nominal sizes from DN 80 and almost without limits upwards (Bild 5.3.1.9.1.1). For this purpose there …
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(Image: Working opening in the opened-up semi-cylinder channel [FI-Teerb]) The work can generally be carried out from the manholes. Depending on the dimensions of the machines to be used, excavations may be necessary. For pressure piping of steel, the required working openings are effected in an excavation by removing a piece of the piping approximately 2 m in length or by cutting open a semi-cylindrical section with chamfered, or even better, rounded, …
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After insertion and centring the spray lining machine at one end of the section of the sewer to be rehabilitated, the machine is pulled or driven backwards through the section of the sewer at a constant velocity during which the spraying of the mortar onto the inner surface of the pipe is carried out by means of a rapidly rotating spray head operated by compressed air or an electric motor (Bild 5.3.1.9.1.2.2) (Bild 5.3.1.9.1.2.2). The mortar is …
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The special equipment used in the different variants of the Centriline procedure can be seen from the corresponding depictions. Approximately 6 persons are required for the utilisation of non-self-propelling equipment, for self- propelling machines, approx. 8 persons are required.
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The advantages of the spray lining procedure are: - Can be applied almost independently of the nominal size and length of the section of the sewer;
- Coating possible on concrete, vitrified clay, asbestos cement, steel, cast iron and brickwork (limited);
- Besides cement grout, also plastics-modified cement grouts can be used with suitable machine modifications;
- Achievement of higher mortar densities and strengths compared to the displacement process;
- Layer …
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The CSL Polyspray process was developed in England in 1984 for the coating of sewers in the nominal size range of DN 225 to DN 1000 [FI-Costa]. The spray lining machine consists of three main elements: - Mixing chamber;
- Gelling section;
- Rotary spray head with drive motor.
The two components of the polyurethane resin are pumped separately up to the mixing chamber and are there mixed intensively by an integrated plastics static mixer. Between the mixing …
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Oct 09, 2023
News
Trenchless Australasia
Adept Civil Group has successfully delivered on a sewer reticulation extension project at the Charlemont Rise estate. Located on Horseshoe Bend Road in Geelong, Charlemont Rise is a community estate with shopping, educational and community amenities, set among over 1400 residential lots.
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Oct 11, 2023
News
Marc Blanchet
H2O Innovation was awarded three new water treatment projects, including drinking water, wastewater, and water reuse applications, totalling $8.5 M.
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Oct 13, 2023
News
Carayol
M. Tucker & Sons is a name to remember when it comes to celebrating female employees and providing them with a safe and fulfilling work environment. Trenchless Australasia had a chat with the star female employees at M. Tucker & Sons.
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Oct 16, 2023
News
Houston Spencer
Xylem Inc., a leading global water technology company dedicated to solving the world’s most challenging water issues, today announced that after a distinguished decade leading Xylem, President and Chief Executive Officer Patrick Decker has announced his plans to retire as CEO at the end of 2023.
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Oct 18, 2023
News
Trenchless Australasia
Whether it be a culturally sensitive site, a heritage location, or simply an ageing infrastructure, working around the inherent challenges that come with these worksites can sometimes require very special care. Trenchless technology is all about mastering and making the most out of every aspect of these locations.
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Oct 20, 2023
News
Hildegard Lyko
The Vlaanderen WaterProof project, backed by a scientific study from VITO (Vlaamse instelling voor technologisch onderzoek), is exploring sustainable water management strategies in the Kempen region to combat the effects of climate change. The project focuses on better retention and reuse of rainwater, with sand extraction pits like the Donk pit in Dessel and the Rauw pit in Mol playing a crucial role as potential reservoirs and alternative water sources.
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Dec 05, 2022
News
Richard Lindner
Redmond’s landscape continues to evolve. Whenever a new subdivision is built, the Division uses ROVVER X to inspect the area’s sewer lines before the new residents move in.
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Feb 16, 2024
News
Houston Spencer
The Silver Creek Water Corporation in southern Indiana manages millions of gallons of water, over hilly terrain, for 20,000 people. Over several decades, the utility has deployed technology from Xylem’s Sensus brand to remotely manage meters, prevent water loss and save costs. These smart digital solutions enable the utility to detect issues before customers are even aware of them.
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Jan 06, 2023
News
Ruben Rodriguez
Research on Informational Messaging Facilitates Customer Relations
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Summary: This module provides a comprehensive overview of direct and indirect optical inspection methods like CCTV for qualitative condition assessment of pipelines and sewers as well as manholes. In terms of content, the module thus belongs to the topic block "INVESTIGATION", the first of the four basic activities within the framework of integral urban drainage management according to EN 752. The optical inspection procedures presented here provide …
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The standard method in a planned inspection in the context of self-monitoring and operational inspections of a drain and sewer system is the visual inspection from inside for a qualitative acquisition of the structural condition [DINEN13508-2] as well as the operational condition. The systems that are applied for the inspections have to be adequate to entirely and explicitly capture all visible damages and conditions in drains and sewers, manholes, …
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(Video: Video recording of an infiltration) How can statements be made regarding leak tightness within the framework of a qualitative condition assessment? The main damage group “infiltration” can only be detected in a visual inspection for the case of infiltrating groundwater or from evidence of staining due to past infiltration. For that reason, for sewers and structures that are completely or partly within the groundwater zone, it is recommended …
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How can statements be made regarding the tightness within the scope of a qualitative condition assessment? To solve this problem, for example, the subsequent installation of a groundwater level indicating device in the manhole to observe the groundwater would be useful [WRC1983], e.g. in the form of a clear-transparent plastic pipe (see illustration). However, due to the fact that partial groundwater lowerings caused by leakages cannot be excluded, …
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The objects to be inspected have to be thoroughly cleaned as close to the inspection date as possible in order to allow for a determination and assessment of their current condition in a proper form. The availability of a cleaning vehicle at all times during the inspection is recommended to ensure the possibility of another cleaning cycle, where required [ATVM143-1:2004] [DWAM149-5:2010]. For the time of the inspection, the sewer section under inspection
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