<abstract xmlns="http://www.w3.org/1999/xhtml">

Brick sewers were designed as egg-shaped, pear-shaped, bell-shaped, vaulted, and even rectangular (sometimes with granite ceilings and floor slabs). In exceptional cases, circular sections were also made of brick. Efforts were made in order to ensure optimal flow conditions, and also that the cross-section was adapted to the shape of the rock mass pressure line. This is due to the fact that the most advantageous shapes for masonry collectors are shapes in which no tensile stresses will occur in any part of the cross-section under the influence of external loads. Nevertheless, sewage conduits degrade over time. The boundary conditions of their use also change, which affects the magnitude of mechanical and hydraulic loads. Further use of a sewer in such a case requires its renewal, and less frequently, modernization that results from the necessity to change its function. This is usually done by introducing a new conduit into the interior of the renovated or modernized sewer, which in literature is called a liner.
The aim of the analysis was to determine the thickness of the liners that strengthen the structures of brick channels with an inverted egg cross-section and with dimensions of 1050 × 700 mm, which are intended for gravitational sewage systems. The analysis included the performance of variant static and strength calculations for the assumption that the conduit after its modernization will be replaced with a conduit operating in the pressure system, which is a very rare requirement.
It was assumed that the best solution would be to use a CIPP (Cured In Place Pipe) liner.
</abstract>

Brick sewers were designed as egg-shaped, pear-shaped, bell-shaped, vaulted, and even rectangular (sometimes with granite ceilings and floor slabs). In exceptional cases, circular sections were also made of brick. Efforts were made in order to ensure optimal flow conditions, and also that the cross-section was adapted to the shape of the rock mass pressure line. This is due to the fact that the most advantageous shapes for masonry collectors are shapes in which no tensile stresses will occur in any part of the cross-section under the influence of external loads. Nevertheless, sewage conduits degrade over time. The boundary conditions of their use also change, which affects the magnitude of mechanical and hydraulic loads. Further use of a sewer in such a case requires its renewal, and less frequently, modernization that results from the necessity to change its function. This is usually done by introducing a new conduit into the interior of the renovated or modernized sewer, which in literature is called a liner.
The aim of the analysis was to determine the thickness of the liners that strengthen the structures of brick channels with an inverted egg cross-section and with dimensions of 1050 × 700 mm, which are intended for gravitational sewage systems. The analysis included the performance of variant static and strength calculations for the assumption that the conduit after its modernization will be replaced with a conduit operating in the pressure system, which is a very rare requirement.
It was assumed that the best solution would be to use a CIPP (Cured In Place Pipe) liner.

Analysis of the structure of liners used for the modernisation of brick collectors

Wroclaw University of Technology: Politechnika Wroclawska

Studia Geotechnica et Mechanica

This work is licensed under the Creative Commons Attribution 4.0 International License.

Brick sewers were designed as egg-shaped, pear-shaped, bell-shaped, vaulted, and even rectangular (sometimes with granite ceilings and floor slabs). In...

Liner thickness		Scheme 1		Scheme 2
19 mm^a	Max deformations (mm)	32.2	Yes
19 mm^a	Max stresses (MPa)	5.4	Yes	56.4	No
40 mm	Max deformations (mm)
40 mm	Max stresses (MPa)			12.9	No
41 mm^b	Max deformations (mm)	3.2	Yes
41 mm^b	Max stresses (MPa)	1.23	Yes	12.29	Yes

Analysis of the structure of liners used for the modernisation of brick collectors

Article Category: Special Issue Article

Data publikacji: 22 gru 2021

Zakres stron: 501 - 509

Otrzymano: 31 sie 2021

Przyjęty: 26 paź 2021

DOI: https://doi.org/10.2478/sgem-2021-0031

Słowa kluczowe
brick sewer, renovation, CIPP liner, modernization of brick sewers

© 2021 Leszek Wysocki et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Thicknesses of the sleeve calculated for the assumed load cases.

Analysis of the structure of liners used for the modernisation of brick collectors

Article Category: Special Issue Article

Data publikacji: 22 gru 2021

Zakres stron: 501 - 509

Otrzymano: 31 sie 2021

Przyjęty: 26 paź 2021

DOI: https://doi.org/10.2478/sgem-2021-0031

Słowa kluczowebrick sewer, renovation, CIPP liner, modernization of brick sewers

© 2021 Leszek Wysocki et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Thicknesses of the sleeve calculated for the assumed load cases.

Słowa kluczowe
brick sewer, renovation, CIPP liner, modernization of brick sewers