Webc. Travellers and Boning Rods • A traveller is similar in appearance to a sight rail on a single support and is portable. The length of the upper edge to its base should be a convenient dimension to the nearest half meter. • Travellers are used in conjunction with sight rails. WebDetermine the height of sight rails above ground at P and Q, if a boning rod of length 3.00m is to be used during construction. Question Transcribed Image Text: Observaions of …
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WebNov 30, 2008 · The 'kit' consists of 3 T-shaped staffs that are typically identical, although when 'fixed' sight rails are used, the 'traveller' may be constructed to a specified length. Most paving and groundworks contractors will have a set of boning rods that they can use on successive jobs, but where a large number of levels are to be established, fixed sight rails … Web2 In order to find the rail levels of an existing rail track, a point A was marked on the rail, then points at distances in multiples of 20 m from A were marked. The following readings were taken: Backsight 3.39 m to a tbm RL = 23.10 m. Intermediate sights on points A, A+20 and A+40; 2.81 m, 2.51 m and 2.22 m respectively. A+60: change point : foresight 1.88 m, … dvds short
What are boning rods? - Answers
WebSight rails are usually offset 2 or 3 metres at right angles to construction lines to avoid them being damaged as excavations proceed. Travellers and boning rods A traveller is similar in appearance to a sight rail on a single … WebC. Sight rails and boning rods. D. A plane table. Answer: Option C . Join The Discussion. Comment * Related Questions on Environmental Engineering. Which of the following … Web1. Sight rails and Boning rods 1.1 The works will be set out by the Contractor. The Contractor shall be required to fix over the centre of each manhole or where a change in direction or gradient occurs a strong timber sight rail, 150mm x 25mm with top edge placed straight and true. These shall be supported and fixed dvds stores online