Handbook quay walls

Du kanske gillar. Calculus Robert A Adams Inbunden. Inbunden Engelska, Essential knowledge for the planning, design, execution and maintenance of quay walls, plus general information about historic developments and lessons gained from observation of ports in various countries.

Technical chapters are followed by a detailed calculation of a quay wall, based on semi-probabilistic design procedure, which applies the theory presented earlier. Quay Walls will interest anyone involved in the design, construction and use of quay walls, including designers, contractors, engineers, operators and managers. Home Search results for: handbook of quay walls. Author : J. Technical chapters are followed by a detailed calculation of a quay wall, based on semi-probabilistic design procedure, which applies the theory presented earlier.

Quay Walls will interest anyone involved in the design, construction and use of quay walls, including designers, contractors, engineers, operators and managers. It also provides a rich source of basic information for students and professionals.. Since the introduction in Dutch in and the English version in much experience has been obtained by many Author : A.

Figure 4 gives an impression of these old drawings of the structures. After receiving all the data 4 main types of urban quay walls are distinguished. The quay walls have different critical objects and have different failure mechanism. Special attention must be paid to quay walls with wooden relieving floor of retaining structure.

Large scour holes may occur at the active soil side of the quay wall. This is extremely dangerous for traffic directly behind the structure an can result in a deadly accident. In case of in section special attention needs to be paid to the wooden pile foundation. It is likely that the foundations are built with wooden piles that can originate from different trees.

The CUR recommendation gives insight for the asset managers and the engineers how to deal with degradation of these aspects. In the figure the different failure mechanism are visualised. Initial data for assessment Especially in urban areas and during the redesign of quay walls in old city centres severe factors are important to obtain an optimal design. With this information a proper adaptation of existing foundations can be made.

On retaining structures both soil and water pressure exert loads. The loads due to transhipment are not so dominant any more. Loads due to traffic and trees have become much more important. Based on these calculations decisions can be made between refurbishment in relation to the lifetime and safety and cost of maintenance, repair or building a complete new structure.

According to recent changes in legislation flora and fauna needs to be paced back in future designs. In figure 8 an example of flora is presented which is very often present at the face of old urban quay walls. Inspection protocol During a tender process for the regular inspections of a quay wall in a certain assets it is very important to describe the inspection protocol accurate. Therefore an asset manager needs to have insight in various types of inspections and in necessary amount of research.

For example is it necessary to investigate all the wooden piles on a quay wall or is it enough to investigate a certain amount of piles per section. This depends on the type of structure and on the objective of the inspection. Because each quay wall is different it is relative hard to prescribe an uniform inspection protocol for all urban structures. Therefore an other strategy is has been chosen.

Almost all quay walls are made of masonry, concrete, wood or steel. Therefore the inspections and investigations are lubricated to the materials. In NEN a method is presented to rank the assets in an area.

This can result in a quick-scan of the total asset area, but not in detailed insight in the degradation process. In this CUR recommendation there are 4 inspection classes distinguished. The asset manager can use these classes in a tender process. Table1 Classification of inspections Class Title Frequency Objective 0 Initial inspection geometry Once Update asset administration 1a Measurements of deformations 1 x year Verify stability o 1b Visual inspection 2 x year Verify functionality and safety 2 Technical inspection light 1 x 5 years Determination condition 3 Technical inspection detailed - Preparation for detailed calculations for assessing 4 Other investigations specific - For example to discover cause damage To enlarge the insight of the asset manager and to create uniformity between municipalities several methods for investigation are described in detail in this CUR recommendation.

With this chapter the expert group is willing to ensure that inspections are carried on regular basis during the design life time of a urban quay wall. An other objective is that inspection class 0 can be used tot update the asset administration in case important files are still missing.

The inspection results needs to be documented in a asses administration system. This system will become the basis of the assess analysis during the life time of a hydraulic structure and needs to be complete before refurbishing a quay wall. Figure 9 Photographs of damage discovered by a visual inspection class 1b 5. Assessing historic quay walls The assessment of urban quay wall is a complex process. In the Netherlands there is a lot of experience with the assessment of the preliminary flood defence system.

The expert group thinks that this system also can be applied to the urban quay wall.