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46 Construction Manual For Sub Stations

The construction manual outlines the process for erecting substation structures. The erection progresses from the bottom up, starting with erecting the four main corner leg members of the first section. Cross bracings are then bolted into place. A derrick is used to hoist parts of the second section into place on top of the first. This process continues section by section until the complete structure is erected. Beams are assembled on the ground face-by-face before being hoisted into place between columns using cranes or derricks. Bracings are then fitted to complete the beam installation. Columns must be truly vertical and beams truly horizontal after erection without straining the structure.

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16 views1 page

46 Construction Manual For Sub Stations

The construction manual outlines the process for erecting substation structures. The erection progresses from the bottom up, starting with erecting the four main corner leg members of the first section. Cross bracings are then bolted into place. A derrick is used to hoist parts of the second section into place on top of the first. This process continues section by section until the complete structure is erected. Beams are assembled on the ground face-by-face before being hoisted into place between columns using cranes or derricks. Bracings are then fitted to complete the beam installation. Columns must be truly vertical and beams truly horizontal after erection without straining the structure.

Uploaded by

man98_greyhoundz
Copyright
© Attribution Non-Commercial (BY-NC)
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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46

Construction Manual for Sub Stations

4.4.3

The erection progresses from the bottom upwards. The four main corner leg members of the first section of the structure are first erected. The cross bracings of the first section are raised one by one and bolted to the already erected corner leg angles. If these have been assembled on the ground, then they are lifted up as a unit. For assembling the second section of the structure, a derrick is placed on one of the corner legs. This derrick is used for raising parts of second section. The leg members and bracings of this section are then hoisted and assembled. The derrick is then shifted to the corner leg members on the top of second section to raise the parts of third section of the structure in position for assembly. The derrick is thus moved up as the structure grows. This process is continued till the complete structure is erected. ERECTION OF BEAMS: The two faces of the beam are assembled on the ground. Each face of the beam is raised with the help of crane or using derricks which are placed on the top of the already erected structures on both the sides of the beam. Single or multi way pulleys with polypropylene / steel ropes are used as per load requirement. The ends of the beam are connected to the column as per fixing arrangement provided on the columns. The bracings of the upper and lower faces of the beam are then raised up and fitted. The columns shall be truly vertical and the beams truly horizontal after erection. Measures taken to bring the column to verticality and beam to horizontality should not result in strain on the structure members so as to cause distortion / bending of the members. The work of erection of beams on erected columns and erection of equipment on erected structures shall not be taken up until these have been checked for tightening of the bolts & nuts. All bolted connections shall be well tightened using spring washers & then punched at three points on the circumference of the bolt.

4.4.4

4.4.5

4.4.6

5.0 5.1 5.2

5.3 6.0

7.0

8.0

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