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Pins - 14070_38
QUESTIONS - CONTINUED - 14070_40

Engineering Aid 1 - Advanced Structural engineering guide book
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Figure  1-51.—Example  of  a  welding  symbol  in  use. Figure  1-52.—Pins  for  structural  steel  connections. pins. (See fig. 1-52.)  Threaded pins are held in place after insertion by threaded recessed nuts on both ends of the pin. Cotter pins are held in place by small cotters that pass through holes drilled in the pins. Washers and separators, made from lengths of steel pipe, are used to space members longitudinally on pins. Holes for small pins  are  drilled;  larger  pinholes  are  bored. Rivets Rivets are manufactured of soft steel in various nominal sizes and lengths. The sizes most often used in structural work are 3/4 inch and 7/8 inch in diameter. The   lengths   differ   according   to   the   thickness   of materials to be connected. Rivets are inserted in the rivet Figure 1-53.—Structural rivets. holes while the rivet is red hot; consequently, the holes are drilled or punched 1/16 inch larger in diameter than the nominal diameter of the cold rivet. Rivets  are  manufactured  with  one  whole  head already fixed. The rivet shank is cylindrical and the second  head  is  formed  by  driving  it  with  a  pneumatic hammer. The rivet set, which is inserted in the end of the hammer, has a cavity of the proper shape to form the head of the rivet. Most Structural rivets are two full heads (fig. 1-53). Manufactured heads of rivets may also be obtained   in   countersunk   shape   to   fit   into   holes countersunk in the material to be connected. When a driven countersunk head is to be formed, the rivet is driven with a flat-ended rivet set to fill the countersunk cavity in the material. QUESTIONS The following questions are strictly for your use in determining  how  well  you  understand  the  topics discussed in this chapter AND IN THE REFERENCES SPECIFICALLY  CITED  IN  THIS  CHAPTER.  The intent of these questions is to help you learn the topics contained   in   the   chapter   and   in   the   references. Remember,  when  you  participate  in  the  advancement examination for EA2, you may be asked questions that are  drawn  not  only  from  this  TRAMAN,  but  from  the cited references as well. Therefore, it is to your benefit to answer the review questions. You do NOT have to submit  your  answers  to  these  review  questions  to anyone for grading. Similar review questions will be included  at  the  end  of  each  chapter  of  this  TRAMAN. After answering the questions, you may turn to appendix VI of this book to see how well you performed. 1-27







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