bij een woonblok volledig funderingsherstel noodzakelijk gebleken. Maatregelen Handboek funderingsherstel, op palen en op “staal”. Share. Stagnatie funderingsherstel Inhoud – KCAF Share. Partieel funderingsherstel van woningblokken – KCAF Share. Handboek Aanschrijven – KCAF. repair; foundation renewal; foundation problems; funderingsherstel .. is derived from the CURNET / SBR Handboek Funderingsherstel and CURNET / SBR.
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Documents Flashcards Grammar checker. This research was carried out in cooperation with the Dutch knowledge centre concerning foundation problems KCAF which gave me the opportunity to apply the mostly theoretical education to an actual practical problem.
Many thanks especially go out to ir. R Schipper, for his support, enthusiasm and consistency, and prof.
Nijsse, for his support and helpful comments. My gratitude goes out to all the contractors and engineers whom I have spoken with for all their knowledge and for providing all the information that was needed for this thesis to be complete.
I would also like to thank ing. Above all, I would like to thank my parents, brothers and girlfriend, for their patience and support. It is estimated that in the upcoming decades about Problems with this type of foundation are mainly caused by wood decaying fungi, bacterial degradation and insufficient load-bearing capacity.
If no measurements are taken to deal with these problems houses will undergo unacceptable settlements and become uninhabitable over time. Foundation repair is essential to prevent this from happening. Currently there are several repair techniques on the market that cost, on average, about Financing the repair often appears to be difficult, especially, in areas where the needed mortgage exceeds the actual value of the house.
Therefore research is done, within this thesis, in search of a more cost-effective construction method. A new method for foundation repair is proposed. This method comprises of external post-tensioned tendons, placed just under the ground floor at both sides of the existing masonry partition walls, a reinforced concrete cantilever beam at the outside of the front and rear facade and new driven sectionalized tubular steel piles, filled with concrete after instalment. In which, the tendons apply a lateral compression force, which supports, in particular, the bending forces above and the existing masonry party wall distributes the loads to the supports.
The cantilever beam provides the support of the house to the new piles and also incorporates a pressure box for the anchorage of the prestressing tendons. In order to put the Prestressed Masonry Beam PMB design into perspective, comparison was made with the currently most often used, floor slab piling method, taking into account the indicative costs for foundation repair.
OATD: Klaver, T. – Foundation repair: In search of a more cost-effective construction method:
This, however, is a rather rough estimate and depends on the situation. Further research and design refinement will change the cost estimate either way, though it can be supposed that the construction costs will not deviate much from the indicative figures given.
It was explained that the PMB design does perform well considering costs, nuisance and sustainability. Though, a structural risk analysis is necessary to quantify the structural ability of the PMB design and more research is funderinhsherstel in general to be accepted as a new construction method for foundation repair.
It also appears that the applicability of the design is rather limited which lowers the potential to outperform conventional repair methods. It was concluded that, although the applicability is rather limited, the Prestressed Masonry Beam has the potential to be a more cost-effective construction method for foundation repair. This thesis covers the invention of the new method, explores the possibility to design a reinforced or prestressed masonry wall in bending and provides a cost estimate for comparison with current foundation repair techniques.
Problems with this type of foundation are mostly caused by wood decaying fungi, bacterial degradation or insufficient load capacity. In some occasions the wooden pile foundation can be preserved by, for example, bringing the ground water level above the wooden foundation parts again. Often more drastic measurements are needed like underpinning the building with new piles and pouring a new concrete floor slab which transfer the loads from the structural masonry walls to these new piles see figure 1.
Herewith risks, nuisance and in particular costs can increase severely. Nowadays, the Dutch government and local authorities offers little possibility to either subsidize the funderingshegstel or to hand out low interest loans for foundation repair. It is also difficult, if not impossible, to get, for instance, provinces, municipalities or water boards Waterschappen liable for foundation problems because a plot owner is considered responsible for its own plot and these funderingsberstel often simply lack the means to act.
Hence the costs for foundation repair are most often entirely for the homeowner. However, if the foundation is in poor condition the property will decrease value, hence, if no action is taken means taking big losses. Therefore there is a need to do research on existing construction methods in search of innovation. It is particularly important to get the costs down and the repair less impairing to the homeowners. Buildings will undergo unacceptable settlements thus funderkngsherstel and crack development will get worse over time.
As a consequence, a thorough repair of the building envelope handboeek even jacking of the whole building might be needed. This means an increase in costs which eventually will probably become too high to salvage a funderingsherstle. The current varies construction methods for foundation repair have an average cost of about It will take some time before new materials and techniques are accepted in the often conservative construction world.
To make this possible, funds are needed to invest in research. Not only to come up with new methods but also to validate this method to be safe and that it can compete with already existing methods. Within the existing construction methods it can however be assumed that enough research is done to get the costs down, both by contractors and engineering firms. Hence it is likely to gain the most by searching for new innovative solutions for foundation repair.
Part of this thesis will explore some of these options. How and with what knowledge current foundations are usually build? What foundation problems have arise over the years and how serious are they?
What kinds of foundation repair methods are used? What are the advantages and disadvantages of the current construction methods? What does foundation repair cost? What materials or combination of materials can be used for foundation repair? What are the developments regarding foundation techniques and can they be applied to foundation repair? Herewith an existing building or a whole building block is considered which has foundation problems and where it has been shown that foundation repair is needed.
Design requirements and boundary funderinvsherstel will be set. The case study should be a representative example. This section will primarily serve to provide some background information to clarify how the foundation problems arise and how serious the problems really are. This will be done through a literature review. The inventory of existing foundation repair techniques and the risks, costs and nuisance that come a long. The various existing techniques can be found in the literature and will funderingshersttel described thoroughly.
Much information can also be found at the KCAF. Finding a cheaper and more efficient construction method for foundation repair and determining the feasibility. Finding a new cost-effective construction method will be the innovative and most challenging part within this thesis.
There is also extensive research handbowk on materials, techniques and methods. The feasibility is tested by the case study mentioned earlier. Draw a conclusion about the ability to innovate within foundation repair by comparison with the existing methods. The findings of the extended research together with the case study should lead to answers concerning the innovative possibilities in foundation repair.
The following is a description of the three separate parts. Part 1 analysis of wooden pile foundations and foundation repair techniques The scope and boundaries within innovative construction methods will be determined in this part. The following parts will be analysed: With the result of this part the first two objectives will be achieved and this section will provide the required input for the second part.
Part 2 conceptual design The requirements and boundary conditions determined in the first part will be analyzed here. The problems and possible contradictions found shall be solved through innovation. To innovate, recent developments in materials, engineering and construction methods will be studied. A large part of the information is taken from the literature, but also interviewing fellow students, teachers and especially people in the field may contribute to finding an innovative solution.
The solutions found are then placed in a morphologic overview from which different concepts will arise. In consultation with the graduation committee and handbiek the use of a performance matrix it will be determined which concept to choose for. This part will result in a conceptual design that will be used for elaboration in the third part. CIE TK V07 11 Part 3 design validation In this part the design will be hamdboek to enable the comparison with a conventional construction method.
Validation of the design must be determined. Most importantly; the design must be feasible and able to compete with existing construction methods. The comparison is done through a case study mentioned earlier. This part along with the other two parts will discuss the conclusions and recommendations. Here, moreover, the last two objectives are achieved. Below is a schematic outline of the thesis.
In the literature review foundation repair is analyzed. The four main rivers Rhine, Meuse, Schelde and IJssel and the influence of the sea have strongly formed the Netherlands and have determined the Dutch soil structure. About half of it is below sea level and would be flooded if there were no dikes, dunes and pumping plants.
Land forming has been stopped, but subsidence continues by slow fujderingsherstel movements. The subsidence of the land and rising sea water level makes it necessary to raise dikes in order to maintain the country Verruijt, This layer directly underneath the surface lacks sufficient bearing handboeek for instance build a multi-storey masonry building on. Below the Holocene soft soil layer is, however, a Pleistocene sand layer which provides more than sufficient bearing strength for that.
This sand layer is used since the 17th funderingsherste, in the Netherlands for pile foundations. A famous example of a building on wooden pile foundation is the old City Hall of Amsterdam built between and on Therefore, most Dutch soils have hydromorphic properties and require artificial drainage Hartemink, The groundwater moves relatively poor threw the soft soil of the Holocene layer.
In most cities of the Western Netherlands is the upper aquifer formed by sand embankment that has the water table as its upper boundary.
A main cause of foundation damage is often due to groundwater variations.