ML20127B719

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Rev 2 to Special Process Procedure W-SP-6, Bending & Straightening of Reinforcing Bars Partially Embedded in Concrete & Placing of Bars in Hardened Concrete
ML20127B719
Person / Time
Site: Waterford Entergy icon.png
Issue date: 10/13/1976
From:
J.A. JONES CONSTRUCTION CO.
To:
Shared Package
ML17198A241 List: ... further results
References
FOIA-84-455 W-SP-6, NUDOCS 8506220038
Download: ML20127B719 (4)


Text

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Procedure No. w-SP-6 J. A. JONES CONSTRUCTION COMPANY

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SPECIAL PROEE,SS PROCEDURE FOR - -

BENDING AND STRAlCHTENING OF REINFORCING BARS PARTIALLY EMBEDDED IN CONCRETE AND Pl. ACING OF BARS IN HARDENED. CONCRETE WATERFORD SES UNIT NO.3 CONTRACT NO. W3-NY-4 ENG IN EER I_NG QUALITY ASSURANCE CONSTRUCT 10N REV. DATE APPRO.VED BY DATE APPROVED BY DATE APPROVED BY DATE O dlA4l76 .CNiud 'I/n/71 & -

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J. A. JONES CONSTRUCTION COMPANY PAGE l . OF 3- ,

i PROCEDURE NO*

SPECIAL PROCESS PROCEDURE

. W-sP-6 BENDING AND STRAIGHTENING OF REINFORCING BARS PARTIALLY REV. N0. 2 TITLE

  • EMBEDDED IN CONCRETE AND PLACING OF flARS IN HARDENED CONCRETE s. DATE 10/13/76 PROJECT TITLE:

WATERFORD SES UN NO. 3 CONTRACT NO. W3-NY-4 1.'U' PURPOSE

To specify methods to be used by J. A. Jones Construction Company and its' subcontractors to straighten reinforcing steel after concrete has been placed.

2.0 SCOPE ,

{' . .

This procedure defines the methods to be used to straighten reinforcing steel af ter concrete has been placed. .

3.0 REFERENCES

! 3.1 ACI 318-71.

3.2 ACI 318 Commentary.

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3.3 1975 Supplement to ACI 318-71 and its Comentary. .

4,0 DEF IN IT I'0NS , is None. -

I i 5.0 RESPONSIBILITY -

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j -1 51 J. A. Jones is to assure proper

  • preparation of reinforcing steel for
  • bending, proper bending of reinforcing steel, and prope r protection of concrete surfaces against damage by heating.

-1 6.0 BENDING AND STRA IGHTENING OF REINFORCING DOWELS -

I j 6.1 Reinforcing bars projecting from existing concrete at an angle may be j , brought to their plumb position, and bars that have been bent may be straightened providing that it is performed in accordance with ACI 318-71

) and the requirements below, j 6.2 , The minimum distance from the center of the bend to an existing concrete j

surface shall be 6 inches or 5 bar diameters whichever is greater.

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6.3 The preheat shall be applied to a length of bar equal to 5 bar diameters I . each way from the center of the bend except that preheat shall not extend below the surface of the concrete and in accordance with the following:

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PAGE 2 0F 3 e 4 * '

s PROCEDURE NO.

SPECIAL PROCESS PROCEDURE . .

W-SP-6 BENDING AND STRAIGHTENING OF REINFORCING BARS PARTIALLY

  • REV. NO. 2 TITLE
  • EMBEDDED IN CONCRETE AND PLACING OF BARS IN HARDENED CONCRETE C. DATE 10/13/76 PROJECT TITLE:

WATERFORD SES UN NO. 3 CONTRACT NO. W3-NY-4

.- 2 6.3.1 0 Heat the bar to between 11000 and 1200 F slowly (approx. I h r. ) .

.- 2 6.3.2 Hold between 11000 and 12000 F for approximately 10 minutes.

-2 6.f.3 Bend bar while between 1100 and 12000 F.

-2 6.3.4 Hold between 11000 and 12000 for 1/2' hour af ter bending.

-2 '6.3.5 Slowly cool for 1/2 hour to 6000 F.

-2 6.3.6 Use acetylene or propane.for heating.

The temperature of the bar at the concrete Interface shall not exceed 500* F. The heated bars shall not be artificially cooled (such as by -

water or forced al.r) until after cooling to at least 6000 F.

, 6.4 Temperature - Measuring crayons shall be L. sed to determine ,the temperature.

Heat shall be applied in such a way as to avoid damage to the concrete.

  • Care shall be taken to prevent quenching of heated bar either by .,,

application of water or by exposure to sudden down pour of ral'n. ,

  • l 7.0 MINIMUM BEND DIAMETER ,

7.1 in the case of bending of reinforcing bars, the following minimum diameters of bend shall apply:

Bar Sizes 3-8 -

6 bar diameter

. Sar Sizes 9-11 -

8 bar diameter

  • Bar Sizes 14 & 18 -

10 bar diameter 8.0 ACCEPTABILITY OF BARS '

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8.1 Straightened bars shall be visually Inspected to determine whether they are cracked, reduced in cross sectiori, or othatwise damaged. Any damaged portions will be cause for rejection and where feasible, rejected portion of bar shall be cut out and replaced by cadwelding or if entire bar is rejected, a new bar shall be grouted in place.

-l 9.0 PS CING 00WELS IN HARDENED CONCRETE

-l 9.1 Dowels that are to be placed in hardened concrete shalt be drilled and epoxy grouted In place in accordance with the following conditions.

9.2 Holes for various si'ze dowels will be drilled as close as possible to desi,gn location and in accordance with the charts below:

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  • JONES CO'NSTRUCTION COMPANY PAGE 3 0F 3 x ._

ROCEDURE NO.

SPECIAL PROCESS PROCEDURE * **

W-SP-6 BENDING AND STRAIGHTENING OF REINFORCING BARS PARTIALLY REV. NO. 2 TITLE

  • EMBEDDED IN CONCRETE AND P!. ACING OF BARS'IN HARDENED CONCRETE

(, DATE 10/13/76 PROJECT TITLE **  !

WATERFORD SES UNIT NO. 3 CONTRACT NO. W3-NY-4 CHART "A" .

Hole Size Rar sfre 4 t; 6 7 8 9 '10 11 14 18

, Minimum Hole Size 1" 1 1/8" le' I 3/8" i "

1 5/8",1 3/4" l 7/8" 29' 2 3/4"

-2 9.3

  • The embedmont length of the new bar shall be equal to the embedmont leng'th of the bar it is replacing. -

9.4 Bars will be requisitioned and/or fabricated according to the reinforcing steel design drawings.

-l 9.5 The' hole will be filled half full with the grouting agent prior to '

inserting dowel. The dowel will be inserted in hole. being careful to

, insure that the dowel is completely bottomed out. If necessary, add more epoxy agent to completely fill hole. .

9.6 Bar.will be adequate.ly braced during set time of epoxy agent in order .

to insure dowel is plumb. ,

10.0 ATTACHMENTS ,

None. .

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