|
|
(Image: Documentation) |
Piping documentation conforming to reality is usually not available, even the owners of the pipe network often have no accurate knowledge of the position of their pipelines. This means that one cannot assume the existence of a distribution according to the standards in the underground construction space. |
|
(Image: Underground pipelines in New York about 1916 [Boegl69]) |
(Image: Unprofessional installed cables and pipelines [… |
|
|
|
|
Open-cut method of construction (Image: Open cut method)
|
(Image: Sheeted trench for the installation by open-cut method of construction) |
(Image: Urban installation of pipelines) |
|
Trenchless method of construction (Image: Geschlossene Bauweise)
|
(Image: Accessible city centre area in spite of construction works) |
(Image: Accessible city centre area in spite of construction works) |
|
|
|
|
|
Trenchless construction technique:
Any technique for constructing pipelines in the ground without opening trenches [DINEN12889:2000]. |
|
(Image: Shield machine arriving in the target shaft) |
|
(Image: Microtunnelling machine with pneumatic spoil removal (method AVP [FI-Herreb]) - Scraper cutting head with view of the rotary vane lock behind the excavation chamber) |
|
(Image: Microtunnelling machine with auger spoil removal ? cutting head) |
|
|
|
Underground … |
|
|
|
|
|
(Image: Manned techniques)
manned |
(Image: Unmanned techniques)
unmanned |
|
(Image: Steerable techniques)
steerable |
(Image: Steerable techniques)
steerable |
(Image: Non-steerable techniques)
non-steerable |
|
(Image: Soil removal techniques)
soil removal |
(Image: Soil removal techniques)
soil removal |
(Image: Soil displacement techniques)
soil displacement |
(Image: Soil removal techniques)
soil removal |
(Image: Soil displacement techniques)
soil displacement |
|
|
|
(Image: Manned techniques) Manned technique:
Technique involving the use of personnel working in the excavated bore during installation [DINEN12889:2000]. |
|
|
|
(Image: Unmanned techniques) Unmanned technique:
Technique avoiding the use of personnel working in the excavated bore during installation [DINEN12889:2000]. |
|
|
|
(Image: Steerable techniques)
Steerable techniques:
Techniques which allow for a correction of the direction of the cutting head, the steel pipe joint or auger flight [Stein05a]. |
|
|
|
(Image: Non-steerable techniques)
Non-steerable techniques:
Techniques which do not allow for a correction of the direction of the cutting head, the steel pipe joint or auger flight [Stein05a]. |
|
|
|
(Image: Soil removal techniques)
Soil removal techniques:
Jacking pipes are jacked either dynamically or statically from a starting shaft to a target shaft whereby the soil or rock material loosened by the jacking is transported away either continuously, in intervals or after the boring [Stein05a]. |
|
|
|
(Image: Soil displacement techniques)
Soil displacement techniques:
Static or dynamic jacking of jacking pipes by displacement of the in situ soil … |
|
|
|
(Image: Overview of the methods of trenchless installation of cables and pipelines by jacking or drilling) |
|
|
|
|
|
(Image: Pros and cons)
Advantages of trenchless construction: -
groundwater lowering not necessary
-
relatively small excavated soil volume
-
only in the region of the starting and target pits road breaking necessary
-
low impact of traffic and thus less traffic jams and strain of residents due to exhaust fumes
-
less damage of neighbouring structures
|
(Image: Pros and cons)
Disadvantage of trenchless technology: -
possibly higher costs with reference …
|
|
|
|
|
Today, the installation of gas, water, and wastewater pipelines is still predominantly carried out using the open trench installation. In view of the numerous disadvantages associated with this method, it is imperative that in the future trenchless pipeline construction be considered much more strongly as an alternative in the planning and construction of sewers and pipelines. For a better understanding of the complexity of the inner-city subsoil, this module provides a brief introduction to infrastructures in the urban subsoil. After completing this module, you will have knowledge regarding: - prerequisites for a functioning infrastructure;
- options for new pipeline construction;
- procedures for trenchless pipeline construction; and
- advantages over the open cut method.
|
|
This lecture "Repair" is part of the lecture series "Trenchless 101" and serves to provide an overview of trenchless repair methods for non-accessible drains and sewers. It is mainly about the following method categories: - reparation by means of robot processes
- sealing by means of internal sleeves.
|
|
|
According to EN 752-5 [DINEN752-5:1997], repair is understood to be measures to rectify local damages. (Image: Repair)
|
|
|
|
These repair processes include: |
- Restoration ;
- Injection processes ;
- Sealing processes .
|
| (Image: Overview of the repair processes) |
| (Image: Self-propelling KASRO-operating robot (PROKASRO Mechatronik GmbH)) |
| (Image: Packer and sewer TV camera for Posatryn process) |
| (Image: Completed Partliner™) |
|
|
|
|
|
|
Restoration processes are used for local or sectional rectifications or for the replacement of pipes or structural components in order to restore the functionality, the static load bearing capacity as well as the leaktightness. | |
(Image: Structural calculation)
|
|
(Image: Leaktightness)
|
|
(Image: Hydraulic)
|
|
|
|
|
|
|
Robot: Remote control device with closed circuit television (CCTV) monitoring, used mainly in localized repair work, such as cutting away obstructions, re-opening lateral connections, grinding and re-filling defective areas and injecting resin into cracks and cavities [NASTT06]. | |
(Image: Repair of a projecting connecting sewer with the KA-TE system [FI-Kunsta])
|
(Image: Sealing a groundwater infiltration with the KA-TE system [FI-Kunsta])
|
|
|
|
|
(Image: Milling of a projecting lateral)
|
(Image: Milling out longitudinal and circumferential cracks)
|
(Image: Grouting of longitudinal cracks)
|
|
(Image: Grouting of circumferential cracks)
|
(Image: Drilling of injection holes through the sewer walls)
|
(Image: Cutting-off ingrown roots and milling the ingress position)
|
|
(Image: Grouting of the ingress position)
|
(Image: Grouting of holes in the sewer wall)
|
(Image: Installation of sleeves)
|
|
|
|
These are the application fields of robot processes: | | (Image: Discrete pipes)
Discrete pipes | (Image: Pipe joints)
Pipe joints | (Image: Branch connections)
Branch connections |
|
|
|
Robot processes are applied to eliminate the following damages: - Radial cracks
- Longitudinal cracks
- Flow obstacles (deposits, foreign substances, root ingress etc.)
- Missing pieces of pipe wall
- Defective pipe connections
- Unprofessional branch connections
| |
(Image: Projecting lateral [FI-Jtele])
|
|
(Image: Root ingress in the region of a pipe joint [FI-KMG])
|
|
(Image: Incrustation [FI-Jtele])
|
| | (Image: Attention!)
The positional stability of the damage … |
|
|
|
(Image: Insertion of robot into manhole)
|
(Image: Camera-controlled positioning of robot)
|
|
(Image: Milling of a crack by means of the KA-TE-milling robot)
|
(Image: Robot with injection head)
|
|
(Image: Grouting of the crack by means of the KA-TE-smoothing robot)
|
(Image: Robot with sleeve)
|
|
Procedure: - The robot is inserted via the closest manhole with access for cleaning and inspection, and its remote-controlled positioning is carried out by …
|
|
