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Temporary structures

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This presentation includes the temporary structure. this is includes scaffolding, shoring and underpinning.

Published in: Engineering
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Temporary structures

  1. 1. ALLPPT.com _ Free PowerPoint Templates, Diagrams and Charts BUILDING MATERIALS & CONSTRUCTIONS POORNIMA COLLEGE OF ENGINEERING, JAIPUR DEPARTMENT OF CIVIL ENGINEERING Temporary structures DIVYA VISHNOI ASSISTANT PROFESSOR
  2. 2. What are temporaryworks? O Temporary works (TW) are the parts of a construction project that are needed to enable the permanent work s to be built. Usually the TW are removed after use. O EX- Scaffolding Shoring Underpinning
  3. 3. What is Scaffolding?  Scaffolding, also called staging, is a temporary structure used to support people and material in the Construction or repair of building and other structures.
  4. 4. O Types ofscaffolding I. Single scaffolding II. Double scaffolding III. Needle scaffolding IV. Trestle scaffolding V. Suspended scaffolding VI. Steel scaffolding VII. Patented scaffolding
  5. 5. Single scaffolding
  6. 6.  This is the most common type of scaffolding and is widely use in the construction of brick work..  It consist of a single row of standards placed at a distance of about 1.20m from the wall.  Standard are placed at 2 to 2.5 m interval.
  7. 7. Double Scaffolding
  8. 8.  This scaffolding is stronger than the single scaffolding.  It is used in the construction of stonework.
  9. 9. Needle Scaffolding ut. O Used:  Ground is week to support the standards.  Construction of upper part of the wall is to be carried o  It is required to keep the ground near wall , free f or traffic etc.
  10. 10. Trestle Scaffolding  In this type of scaffolding, the working platform is s upported on movable co ntrivances movable on wheels.  Use: painting , repair work
  11. 11. What is Shoring?  Shoring is the construction of a temporary structure to support temporarily an unsafe structure. Types of Shoring  Raking Shores  Flying Shores  Dead Shores
  12. 12. Raking Shor es
  13. 13.  This is a system of giving temporary support to an unsafe wall.  The construction of raking shore, varies with the condition at site.  In this method In this method inclined members called rakers are used to give lateral support to the wall.
  14. 14. Flying shores
  15. 15.  In this type of shoring horizontal supports are pr ovided for supporting temporarily the parallel wal ls of the two adjacent buildings which may tend t o collapse or damage.  If the walls are quite near to each other (up to 9m) single flying shore can be constructed.  When the distance between two parallel walls is more than 9m a double shore can be constructed .
  16. 16. Dead shores
  17. 17. Such type of shoring is provided for the following purposes:  Rebuild the defective lower part of the wall.  Rebuild the existing foundation.  To make large opening in the existing wall.
  18. 18. Underpinning The term underpinning is applied to the construction of a new foundation underneath the existing one for strengthening purposes. Types ofunderpinning Pit Method Pile Method Miscellaneous Method
  19. 19. 1. Pit Method  In this method existing wall over the foundations divided into various sections, generally 1.2 to 1.5 m in le ngth.  Holes are than made at adequate height in the existing wall.  In these holes steel needle beams with bearing plates are inserted and supported on either side of the by means of crib supports.
  20. 20. 2. Pile Method n  I n this method, piles are driven at regular interval along both the sides of the wall. • The piles are connected by concrete or steel needles, penetrating through the w all. • This method is very much useful in clayey soils, and i water logged areas.
  21. 21. 3. Miscellaneous method 1) Cement grouting 2) Chemical consolidation 3) Freezing 4) Vibroflotation
  22. 22. References 1) “Building Construction” authored by S.C. Rangwala, Char otar publishing house Pvt. Ltd. 2) “Building Construction” authored by Bindra and Arora, Dh anpat Rai publication. 3) “Building Construction” authored by M.L. Gambhir, Tata Meghraw Hills publication.

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