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AND Ex!ISTiING BRACES ! eA mia 1
oo oa
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ee ee 5 r =]
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8
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To Floor : To FLoor Le

SN Figen 37

1. Wall stringers, (A) spaced approximately 5 feet to 5 feet 6 inches apart must be placed closer
together as indicated.

2. Pipe extension braces (B) now fastened in extreme corners of present backboard (see fig. 3) must
be drawn together horizontally as well as vertically.

3. Guy rods and guy wires, (C) both supporting and cross bracing, will have to be altered to suit
the revised structure.

In the above illustration (fig. 7) the dotted lines represent the present installation and the solid lines
show the new modified backboard with the exsiting wall stringers and pipe extension braces relocated
to suit. Arrows indicate the directione the wall stringers and pipe extension braces must be moved to
form a structure of the proper size to accommodate the modified board.

While the example used above involves the simple wall braced type structure the same general change-
over procedure will apply for units such as balcony attached and wall attached swing-up units.

In some cases the existing structure might. differ from that pictured above due to different building
conditions which require horizontal wall stringers instead of vertical stringers or pipe extension braces
spread to fit around an obstruction to the rear of the backboard (see fig. 9). The first step in plan-
ning the revision work in such cases is to indicate on the rear of the present backboard locations of
fitting attachments’ that will be required for the modified board. Then determine how the structure
supports and guy rods will have to be altered to fit between the attachment points (for the new
modified board) and the present wall stringers. See fig. 8 and 9 below.

PrReseENT BACKBOARD
AND EXISTING BRACES

N

a PRESENT BacKBoaRnD
AND EXisTiIng BRACES

ao

   
 

MoDIFIED Backs
ee Brace

MoDIFIED BAc
WitTH Braces

 

 

 

 

 

 

 

 

 

r----

 

 

 

 

 

a- 9° .
SIDE ELEVATION Z Loaee roe SIDE ELEVATION Uj
@q=6° y-a° Ze
To FLOOR To Froor

Fig. 8 Fig. 9

 

MEDART

 

 

ST. LOUIS