Restaurering av korrosionsskadade murverksbalkar genom återförankring.
(2007)Division of Structural Engineering
- Abstract
- In the period between 1940s and 1970s the widespread practice in Sweden was to use non-stainless steel reinforcement in masonry walls. In many cases cracks started to appear in joints above openings in these walls because of corrosion of the reinforcement. The largest problem is that the appearance of damaged buildings deteriorates and there is a risk of bricks falling down and rain water penetrating into the construction. A typical solution to this problem is to replace the lowest row of bricks with pre-stressed masonry beams, but this method often changes the facade’s appearance.
In this thesis we present a new method that has been developed and practically tested.
It is based on reattachment of bricks with screws without dowels.... (More) - In the period between 1940s and 1970s the widespread practice in Sweden was to use non-stainless steel reinforcement in masonry walls. In many cases cracks started to appear in joints above openings in these walls because of corrosion of the reinforcement. The largest problem is that the appearance of damaged buildings deteriorates and there is a risk of bricks falling down and rain water penetrating into the construction. A typical solution to this problem is to replace the lowest row of bricks with pre-stressed masonry beams, but this method often changes the facade’s appearance.
In this thesis we present a new method that has been developed and practically tested.
It is based on reattachment of bricks with screws without dowels. During renovation the damaged reinforcement is removed and is not replaced if the width of the opening is less than two meters. In this case the masonry above the opening starts to function as a vault rather than as a beam. This requires that there should be enough horisontal support in the vicinity of a corner of the building and that the distance between openings in the horizontal direction is large enough.
In order to be able to implement this technique, a prop construction was developed that should secure the lowest bricks from falling down during removal of the reinforcement. Screws chosen for the test were long stainless flat-head socket screws to make the renovation less obtrusive.
The method worked smoothly during the testing and a practical step-by-step manual has been compiled. (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/student-papers/record/3172369
- author
- Kruglyak, Ilya and Olsson, Markus
- supervisor
-
- Johan Jönsson LU
- Miklos Molnar LU
- organization
- year
- 2007
- type
- H3 - Professional qualifications (4 Years - )
- subject
- report number
- TVBK-5147
- ISSN
- 0349-4969
- language
- Swedish
- id
- 3172369
- date added to LUP
- 2012-12-04 14:56:57
- date last changed
- 2014-06-12 14:55:21
@misc{3172369,
abstract = {{In the period between 1940s and 1970s the widespread practice in Sweden was to use non-stainless steel reinforcement in masonry walls. In many cases cracks started to appear in joints above openings in these walls because of corrosion of the reinforcement. The largest problem is that the appearance of damaged buildings deteriorates and there is a risk of bricks falling down and rain water penetrating into the construction. A typical solution to this problem is to replace the lowest row of bricks with pre-stressed masonry beams, but this method often changes the facade’s appearance.
In this thesis we present a new method that has been developed and practically tested.
It is based on reattachment of bricks with screws without dowels. During renovation the damaged reinforcement is removed and is not replaced if the width of the opening is less than two meters. In this case the masonry above the opening starts to function as a vault rather than as a beam. This requires that there should be enough horisontal support in the vicinity of a corner of the building and that the distance between openings in the horizontal direction is large enough.
In order to be able to implement this technique, a prop construction was developed that should secure the lowest bricks from falling down during removal of the reinforcement. Screws chosen for the test were long stainless flat-head socket screws to make the renovation less obtrusive.
The method worked smoothly during the testing and a practical step-by-step manual has been compiled.}},
author = {{Kruglyak, Ilya and Olsson, Markus}},
issn = {{0349-4969}},
language = {{swe}},
note = {{Student Paper}},
title = {{Restaurering av korrosionsskadade murverksbalkar genom återförankring.}},
year = {{2007}},
}