ML19257C203
| ML19257C203 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 01/07/1980 |
| From: | CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | |
| Shared Package | |
| ML19257C202 | List: |
| References | |
| NUDOCS 8001250231 | |
| Download: ML19257C203 (9) | |
Text
.
ATTACHMENT 1 EXCERPTS FROM SPECIFICATION 7220-305(Q) Rev. 11 TECHNICAL SPECIFICATION FOR FURNISHING, INSTALIATION AND TESTING OF EXPANSION TYPE CONCRETE ANCHORS PAGES 3, 5, 6, 7, 8, 9, 10 1808 127 001250 8
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Specifi~ cation 7220-C-305, Rev 10 NOTES:
,g (1)
In this classification, expansion anchors can be used for all piping supports where the load does not exceed 15 kips per hanger except as noted below:
a)
Expansion anchors shall not be used for Class I piping over 2-1/2 inches in diameter.
b)
Expansion anchors shall not be used for Class II piping over 8 inches in diameter.
c)
Expansion anchors shall not be used for piping systems and anchor points as listed in Appendix D.
(2)
Expansion anchors shall not be used for reciprocating equipment.
(3)
Expansion anchors may be used to attach 0 and non-Q items to block walls subjected to the following criteria.
(1)
Expansion anchors to be used as indicated in Sketch 1 shall have a 5/8-inch diameter and a minimum emaedment length of 4 inches.
These anchor bolts shall be located in the center or the cell +3/4 inch.
The design loads shall be 600 pounds per bolt if there is only one bolt installed per block or 400 pounds per bolt if there are two bolts installed per block.
(2)
Expansion anchors to be used as indicated in Sketeh 2 may be any size diameter, however the embedment length is the depth that is projected into the concrete / grout center.
(3)
All reinforcing steel that may intertere with expansion anchors must be located prior to drilling.
Reinforcing steel in block walls shall not be cut.
(4)
Actual design loads to be imposed on the block walls shall not exceed those 3
1808 128
Specification 7220-C-305, Rev 11 jpg Y
4.0 INSTALLATION Installation of the expansion concrete anchors shall be perfortned in accordance with the requirements of Table 2.1.
The installers shall be qualified to perform this work by the project field engineer / Subcontractor.
4.1 Expansion anchors shall be installed in concrete which has been in place for more than 28 days, or has reached its design strength, jpg whichever comes first.
Expansion anchors shall not be installed in concrete block walls except as noted in Table 2.1.
4.2 Holes for expansion bolts shall be drilled in nccordance with manuf..cturer's installation recommendations except as specified herein.
4.3 Holes shall be drilled with tolerances in accordance with Figure 1 and Figure 2.
4.4 Unless diamond core bits are used, the bit shall be removed upon meeting the rebar.
Diamond core bits shall be used to cut the rebars and to drill the hole beyond the reinforcing bar such that the whole wedge portion of the anchor can be expanded behind
(()
the rebar (see Figure 2).
The tolerances for the drills shall be as recommended by the expansion anchor manufacturer.
4.5 Expansion anchors which interfere with reinforcing steel shall be installed in accordance with Appendix E.
4.6 After reaching the required depth, the concrete dust shall be removed from the hole.
4.7 Expansion anchors shall be installed in accordance with the manufacturer's recommendations and as shown below.
4.8 Expansion anchors shall be seated and expanded s
by applying the torque as determined by onsite ifs testing (See Table 4.1).
A manually operated calibrated torque wrench or a power operated impact torque wrench shall be used to measure the torque.
(E) 1808 129 5
i
Specification 7220-C-305, Rev 11 j
4.9 Welding to expansion anchors shall not be permitted.
lh 4.10 The nut shall be fully engaged on the expansion bolt.
4.11 When an expansion anchor hole is abandoned, the minimum clearance to the next anchbr hole shall be two diameters.
The loading of the expansion anchor shall be after the abandoned hole has been satisfactorily repaired.
abi 4.12 Deleted 4.13 An abandoned anchor hole need not be repaired prior to loading of an expansion anchor if that expansion anchor is at least as far as the minimum edge distance defined in Table 4.1.
4.14 After the specified torque has been obtained, verify that the maximum thread engagement s
length of the stud anchor is at least 1/8 inch jh shorter than the manufacturer's specified thread length.
4.15 Mislocated and abandoned expansion anchors shall not be cut off at the co2. crete surface.
These anchors shall be left in 1 lace (exposed) or completely removed.
4.16 Grout is not to be included with concrete for measuring the embedment depth.
4.17 When expansion anchors of dif ferent diameters and/or embedment depths are located near each other or near a grouted anchor, the minimum center to center spacing shall be the sum of the minimum edge distances of both anchors as defined in Table 4.1 and in Specification 7220-C-306, Appendix B.
IED 1808 130 e
O O.
O TABLE 4.1 (For wedge and stud type anchors)
Torque at Min. Turns Min.
Min.
of Nut Embmt b Embmt g Min.
Installation Test Torque g
Anchor (ft-lbs)
(After Test Required (Inches)
(Inches)
Min. c/c Edge Diameter Threads not Installation)
Load in Torque before after Spacing Distance 1
(Inches)
Lubricated (I)
(ft-lbs)
(Kips)
Rahge Torquing Torquing (Inches)
(Inches)
(E) 1 t
1/4 5 - 10 5
0.5 1-1/8 1
3 1-1/2 i
3/8 25 - 35 20 1.0 1-5/8 1-3/8 4
2 1/2 35 - 55 30 2.0 2
2-1/4 2
5 3
5/8 130 - 160 80 4.0 2
2-3/4 2-1/2 6
3-1/2 5/8 130 - 160 80 4.0 2
4 3-3/4 6
3-1/2 g
i 3/4 240 - 270 135 6.0 3
3-1/4 2-7/8 7-1/2 4.
3/4 240 - 270 135 6.0 3
4 3-5/8 7-1/2 4
3/4 240 - 270 135 6.0 3
5 4-5/8 7-1/2 4
7/8 275 - 325 165 7.0 3
4 3-1/2 9
5
-4 7/8 275 - 325 165 7.0 3
5-1/2 5
9 5
1 425 - 475 240 8.0 3
4-1/2 4
10 6
1 425 - 475 240 8.0 3
6 5-1/2 10 6
(1) These values give a torque range, which was arrived at by testing anchors for the different concrete strengths used on the job (for 1/2", 5/8", 3/4", 7/8", and 1" expansion anchors only).
g ]S (2) If the maximum torque value is attained, the minimum number of turns is not applicable.
g?
- O (3) *Ihe minimum spacing and minimum edge distance may be reduced up to 50% with prior approval of
$;l Project Engineering.
8 O
(4) Use greater minimum embedment length for installation, unless noted otherwise on the design documents P
or as approved by Project Engineering.
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Specification 7220-C-305, Rev 11 g$i y
5.0 INSPEC110N h
E'ach expansion anchor shall be visually inspected for correct installation.
This can be accomplished by either of the following.
5.1 Each expansion anchor shall be visually inspected in accordance with the requirements of Article 4.0 at the time of installation.
5.2 A surveillance method may be used to inspect the expansion anchors at the time of installation in accordance with the requirements of Article 4.0, provided all of the remaining expansion anchors are tested in accordance with Sections 6.2 and 6.3 and inspected to the applicable requirements of Article 4.0.
If inspection reveals that an installed anchor does not conform to the requirements of Article 4.0, that anchor shall be tested in accordance with Sections 6.2 and 6.3.
When the anchor fails, the embed shall be either relocated as permitted by the design and requirements of this. Specification, the anchor removed, and the area repaired; or the anchor shall be removed and replaced by another anchor.
Mislocated anchors may be left in place, provided O,
they do not interfere with other work.
If a mislocated anchor is to be used, it shall be satisfactorily tested in accordance with Sections 6.2 and 6.3 and inspected to the applicable requirements of Article 4.0.
6.0 TESTING 6.1 Testing Frequency 6.1.1 One out of each lot of 10 expansion anchors which were inspected at the time of installation, except 1/4-inch and 3/8-inch diameter anchors, shall be tested in accordance with the requirements of Section 6.2.
One out 2hi of each lot of 20 1/4-inch and 3/8-inch diameter anchors which were inspected at the time of installation shall be tested in accordance with the requirements of Section 6.2.
Test anchors shall be selected at random so that they are representative of the group in which they are located and of the installation conditions.
O 8
1808 132
Specification 7220-C-305, Rev 11 j{
6.1.2 If the test anchor satisfies the f
acceptance criteria of Section 6.3, all anchors of that lot shall be deemed acceptable.
6.1.3 Should the test anchor fail to satisfy any one of the acceptance criteria, three additional anchors of the same lot shall be tested in accordance with Section 6.2.
6.1.4 Should all of the additional test anchors satisfy the acceptance criteria, all remaining anchors in that lot shall be deemed acceptable.
6.1.5 Should any of the additional test anchors fail, all anchors in that lot shall be tested.
6.2 Testing Methods Verification and documentation of testing shall be done by personnel other than jhs installers.
Test anchors, selected in accordance with the provisions of Section 6.1 above, and all anchors which were not
'fg inspected at the time of inctallation shall be l()
tested by one or both of the following methods:
6.2.1 Torque Testing Method Test the installed expansion anchor with a calibrated manually operated or i
a power-operated impact torque wrench.
The anchor shall meet the acceptance criteria of Section 6.3.
6.2.2 Tensioner Testing Method Test the installed expansion auchor with a tensioner.
For expansion anchors use the test loads shown in Table 4.1.
The testing equipment shall be supported so that the load will be distributed outside a circ:
that has a minimum diameter of four (4) times the
.:inimum embedment of the anchor.
1808 133 1
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Specification 7220-C-305, Rev 11 j{
6.3 Acceptance Criteria An installed anchor shall be considered acceptable if it meets the applicable testing criteria of Table 4.1 and if during testing
_U2 the concrete did not break-out, the anchor did not break, distort, or deform; and the anchor did not slip excessively or become loose.
The anchor shall be termed " slip excessively" as follows:
6.3.1 Torque Testing Method The nut will rotate with less than the applicable test torque applied in accordance with Table 4.1.
6.3.2 Tensioner Testing Method The washer can be rotated by hand when the load is fully applied.
7.0 REPAIR OF ANCHOR FAILURES All failed anchors must be replaced and then rotested as specified.
Damaged concrete must be repaired.
7.1 Failure Due to Concrete Breakout 7.1.1 Replace the expansion anchor with the embedment depth obtained beyond the breakout depth.
7.1.2 Damaged concrete shall be repaired in accordance with the requirements of Article 17.0 of Specification 7220-C-231.
Damaged concrete shall be chipped to sound concrete prior to reinstallation of anchors.
Concrete shall be repaired after reinstallation of anchor.
7.2 Failure Due to Anchor Breakage, Slippage or Loosening If the anchor breaks, distorts, or deforms, it shall be replaced with another anchor, or the hole shall be redrilled and a larger size anchor installed, if the integrity of surrounding concrete has not been disturbed.
If the anchor f ails by slippage or loosening, the stud anchor shall be retorqued and then re tes ted.
O 1808 134 10 w
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