I’m getting more and more Technics pianos to repair which have been worked on by someone else. I’m often told that they prefer their Technics piano to any of the current models by Roland and Yamaha! The owners also think these are worth repairing. I think they are worth repairing because most of them sound really good and have a lovely action so they feel great to play too. As far as I know they just decided to pull out of making musical instruments – which is a pity because they made some really good products. Contrary to some rumours Technics did not “go bust” or cease trading. One of the leading names but sadly no longer in production. Technics – a great range of organs, digital pianos and keyboards. I would rather have your telephone number (landline, not mobile) than your email address. If you are in the UK, please read the info on the CONTACT page first. Please DO leave your email address, slowly and clearly, on my answerphone using the “PHONETIC ALPHABET” (see CONTACT page) so I can be sure of getting it right. However the engineer should prepare an estimate of the cost of the most promising type of foundation which represents the most acceptable compromise between performance and cost.If you want to send me a Technics board for repair from outside the UK Shallow foundations, such as footings and rafts, cost less and are easier to execute while deep foundations usually cost more and require well trained engineers to execute. After this study, one could then decide whether shallow foundations or deep foundations should be used. The allowable bearing capacity of the affected soil strata should then be estimated. Then the soil characteristics within the affected zone below the building should be carefully evaluated. Therefore to decide about the type of foundation, subsoil exploration must be carried out. The choice of the appropriate type of foundation is governed by some important factors such as
Deep foundations are foundations where the depth of the footing (D f) is greater than the width (B) of the footing. In shallow foundations, the depth of the footing (D f) is generally equal to or less than the width (B) of the footing. There are different types of deep footings including impact driven piles, drilled shafts, caissons, helical piles, and earth stabilized columns.Ī Caisson (monopole) foundation is a type of deep foundation which uses a single, generally large-diameter, structural element embedded into the earth to support all the loads (weight, wind, etc.) of a large above-surface structure. There are different types of footings to suit the nature of the structure.Ī deep foundation is used to transfer a load from a structure through an upper weak layer of soil to a stronger deeper layer of soil.
One common type is the spread footing which consists of strips or pads of concrete (or other materials) which extend below the swell and shrink line in the tropical countries or frost line in the temperate countries and transfer the weight from walls and columns to the soil or bedrock.Ī footing is actually an enlargement of the base of a column or wall for the purpose of distributing the load on the supporting soil at the appropriate pressure. Shallow foundations, often called footings, are usually, embedded about a meter or so into soil.
Negative skin friction, its causes, capacity, and ways of reducing its effect are considered. The group capacity can be determined by the use of empirical formulas and by the rational/equivalent method. The efficiency of the group of deep foundations is discussed. The chapter examines the types, situations calling for the use, advantages and disadvantages, load-carrying capacity, and design of deep foundations. The procedure and considerations in the design of shallow foundation are discussed. The chapter considers the modes of failure and several methods of determining the ultimate bearing capacity of foundations. The design must also take into consideration the requirements of safety, dependability, serviceability, functional utility, and economy. The primary design concerns of foundations are settlement and bearing capacity. The choice of the appropriate type of foundation is governed by some important factors such as the nature of the structure, the loads exerted by the structure, the subsoil characteristics, and the allotted cost of foundations. AbstractFoundations are structural elements that transmit loads from structures to the underlying soil.