Section 408.42636. Steel joists; attachment; erection.

(1) Each end of "K" series steel joists shall be attached to the support structure with a minimum of 2 1/8-inch (3 mm) fillet welds 1 inch (25 mm) long or with 2 1/2-inch (13 mm) bolts, or the equivalent.

(2)   Each end of "LH" and "DLH" series steel joists and steel joist girders shall be attached to the support structure with a minimum of 2 1/4-inch (6 mm) fillet welds 2 inches (51 mm) long, or with 2 3/4-inch (19 mm) bolts, or the equivalent.

(3)   Except as provided in subrule (4) of this rule, each steel joist shall be attached to the support structure, at least at 1 end on both sides of the seat, immediately upon placement in the final erection  position and before additional joists are placed.

(4)   Panels that have been preassembled from steel joists with bridging shall be attached to the structure at each corner before the hoisting cables are released.

(5)   Both sides of the seat of 1 end of each steel joist that requires bridging under tables A and B shall be attached to the support structure before hoisting cables are released.

(6)    For joists that are more than 60 feet long, both ends of the joist shall be attached as specified in this rule before the hoisting cables are released.

(7)   On steel joists that do not require erection bridging under  tables   A and B, only 1 employee shall be allowed on the joist until all bridging is installed and anchored. Tables A and B read as follows:

Table A–Erection Bridging for Short Span Joists

Joist	Span		Joist	Span		Joist	Span
8L1	NM		22K10	40-0		14KCS1	NM
10K1	NM		22K11	40-0		14KCS2	NM
12K1	23-0		24K4	36-0		14KCS3	NM

12K3	NM		24K5	38-0		16KCS2	NM
12K5	NM		24K6	39-0		16KCS3	NM
14K1	27-0		24K7	43-0		16KCS4	NM
14K3	NM		24K8	43-0		16KCS5	NM
14K4	NM		24K9	44-0		18KCS2	35-0
14K6	NM		24K10	NM		18KCS3	NM
16K2	29-0		24K12	NM		18KCS4	NM
16K3	30-0		26K5	38-0		18KCS5	NM
16K4	32-0		26K6	39-0		20KCS2	36-0
16K5	32-0		26K7	43-0		20KCS3	39-0
16K6	NM		26K8	44-0		20KCS4	NM
16K7	NM		26K9	45-0		20KCS5	NM
16K9	NM		26K10	49-0		22KCS2	36-0
18K3	31-0		26K12	NM		22KCS3	40-0
18K4	32-0		28K6	40-0		22KCS4	NM
18K5	33-0		28K7	43-0		22KCS5	NM
18K6	35-0		28K8	44-0		24KCS2	39-0
18K7	NM		28K9	45-0		24KCS3	44-0
18K9	NM		28K10	49-0		24KCS4	NM
18K10	NM		28K12	53-0		24KCS5	NM
20K3	32-0		30K7	44-0		26KCS2	39-0
20K4	34-0		30K8	45-0		26KCS3	44-0
20K5	34-0		30K9	45-0		26KCS4	NM
20K6	36-0		30K10	50-0		26KCS5	NM
20K7	39-0		30K11	52-0		28KCS2	40-0
20K9	39-0		30K12	54-0		28KCS3	45-0
20K10	NM		10KCS1	NM		28KCS4	53-0
22K4	34-0		10KCS2	NM		28KCS5	53-0
22K5	35-0		10KCS3	NM		30KCS3	45-0
22K6	36-0		12KCS1	NM		30KCS4	54-0
22K7	40-0		12KCS2	NM		30KCS5	54-0
22K9	40-0		12KCS3	NM

NM = Not Mandatory

Table  B–Erection  Bridging  for  Long  Span  Joists

Joist	Span		Joist	Span
18LH02	33-0		28LH06	42-0
18LH03	NM		28LH07	NM
18LH04	NM		28LH08	NM
18LH05	NM		28LH09	NM
18LH06	NM		28LH10	NM
18LH07	NM		28LH11	NM
18LH08	NM		28LH12	NM
18LH09	NM		28LH13	NM
20LH02	33-0		32LH06	47-0        through 60-0
20LH03	38-0		32LH07	47-0        through 60-0
20LH04	NM		32LH08	55-0        through 60-0
20LH05	NM		32LH09	NM through 60- 0
20LH06	NM		32LH10	NM through 60- 0
20LH07	NM		32LH11	NM through 60- 0
20LH08	NM		32LH12	NM through 60- 0
20LH09	NM		32LH13	NM through 60- 0
20LH10	NM		32LH14	NM through 60- 0

24LH03	35-0		32LH15	NM through 60- 0
24LH04	39-0		36LH07	47-0        through 60-0
24LH05	40-0		36LH08	47-0        through 60-0
24LH06	45-0		36LH09	57-0        through 60-0
24LH07	NM		36LH10	NM through 60- 0
24LH08	NM		36LH11	NM through 60- 0
24LH09	NM		36LH12	NM through 60- 0
24LH10	NM		36LH13	NM through 60- 0
24LH11	NM		36LH14	NM through 60- 0
28LH05	42-0		36LH15	NM through 60- 0

NM = Not Mandatory

(8)   Employees shall not be allowed on steel joists where the span of  the steel joist is equal to or greater than the span shown in tables A and B, except in accordance with subrules (10), (11), (12), (13), (14), and (15) of this rule.

(9)     When permanent bridging terminus points cannot be used during erection, additional temporary bridging terminus points are required to provide stability. (See appendix C)

(10)   If the span of the steel joist is equal to or greater than the  span shown in tables A and B, then all of the following provisions shall apply:

(a)   A row of bolted diagonal erection bridging shall be installed near the midspan of the steel joist.

(b)    Hoisting cables shall not be released  until   the  bolted  diagonal erection bridging specified in subdivision (a) of this subrule is installed and anchored.

(c)   Not more than 1 employee shall be allowed on spans of steel joist that is equal to or greater than the span shown in tables A and B, until all other bridging is installed and anchored.

(11)   If the span of the steel joist is not less than 60 feet (18.3 m) and not more than 100 feet (30.5 m), then all of the following provisions shall apply:

(a)  All rows of bridging shall be bolted diagonal bridging.

(b)   Two rows of bolted diagonal erection bridging shall be installed near the third points of the steel joist.

(c)   Hoisting cables shall not be released until bolted diagonal erection bridging is installed and anchored.

(d)  Not more than 2 employees shall be allowed on spans of steel joist not less than 60 feet and not more than 100 feet until all other bridging is installed and anchored.

(12)   If the span of the steel joist is not less than 100 feet (30.5 m) and not more than 144 feet (43.9 m), then all of the following provisions shall apply:

(a)  All rows of bridging shall be bolted diagonal bridging.

(b)   Hoisting cables shall not be released until all bridging is  installed and anchored.

(c)   Not more than 2 employees shall be allowed on spans of steel joist that are not less than 100 feet and not more than 144 feet until all bridging is installed and anchored.

(13)  For steel members spanning more than 144 feet (43.9 m), the erection methods used shall be in accordance with R 408.42628 and R 408.42629.

(14)   If any steel joist specified in subrules (6), (10), (11), and (12) of this rule is a bottom chord bearing joist, then a row of bolted diagonal bridging shall be  provided near the supports. The bridging shall be installed and anchored before the hoisting cables are released.

(15)    If bolted diagonal erection bridging is required by this rule, then all the following provisions shall apply:

(a)  The bridging shall be indicated on the erection drawing.

(b)   The erection drawing shall be the exclusive indicator of  the  proper placement of the bridging.

(c)   Shop-installed bridging clips, or functional equivalents, shall be used where the bridging bolts to the steel joists.

(d)  If 2 pieces of bridging are attached to the steel joist by a common bolt, then the nut that secures the first piece of bridging shall not  be removed from the bolt for the attachment of the second.

(e)   Bridging attachments shall not protrude above the top chord of the steel joist.

History: 2002 AACS; 2007 AACS.