ML20127B736

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Rev 3 to Special Process Procedure W-SP-6, Bending & Straightening of Reinforcing Bars Partially Embedded in Concrete & Placing of Bars in Hardened Concrete
ML20127B736
Person / Time
Site: Waterford Entergy icon.png
Issue date: 06/07/1977
From:
J.A. JONES CONSTRUCTION CO.
To:
Shared Package
ML17198A241 List: ... further results
References
FOIA-84-455 W-SP-6, NUDOCS 8506220043
Download: ML20127B736 (4)


Text

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  • * - * . Procedura No, w-sp i' J. A. J0::ES CONSiRUCTION COMPANY SPECIAL PR06ESS PROCEDURE FOR SENDING AP D STRAICHTENING OF RElHFORCING '

BARS PARTIALLY EMBEDDED IH C0tiCRETE AND

. Pl. ACING OF BARS IN HARDENED. CONCRETE WATERFORD SES UNIT NO.3 CONTRACT NO. W3-NY-4 ENGINEERING QUALITY ASSURANCE. CONSTRUCTION REV. DATE APPRO.VED BY DATE APPROVED BY DATE APPROVED BY CATE

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, , J. A. JONES CONSTRUCTION COMPANY PAGEl 0F 3 SPECIAL PROCESS PROCEDURE

  • W.SP-6 BENDING AND STRAIGHTENING OF REINFORCING BARS PARTIALLY REV. NO. 3 TITLE: EMBEDDED IN CONCRETE AND Pl. ACING OF BARS t,DATE IN HARDENED 6/7/77 CONC PROJECT TITLE:

WATERFORD SES UN NO. 3 CONTRACT NO. W3-NY f+

i.1 'FvRrQu 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 EQg .

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

3.0 REFERENCES

3.I ACI 318-71.

3.2 ACI 318 Comentary.

' R-l .

3 3. 1975 Supplement to ACI 318-71 and Its Consnentary.

l+. 0 DEFINITIONS

,e None.

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5.0 RESPON5 f 81LITY R-1 5.1 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 damege by heating.
  • R-l 6.0 SENDING AND STRAIGHTENING OF REINFORCING 00WELS 6.1 Reinforcing bars projecting from existing concrete at an angle may be brought to their plumb position, and bars that have been bent may be straightened providing that it is performeda in accordance with ACI 318-71 and the requirements below.

6.2 The minimum distance from the center of the bend to an existing concrete surface shall be 6 Inches or 5 bar diame'ters etchever is greater.

R-2 6.3 The pr'ehest shall be applied to,a length of bar equal to 5 bar diameters 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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A J. ... JONES CONSTRUCTIOff COMPANY PAGE 2 0F 3 i

. SPECIAL PROCESS PRCCEDURE

  • i W-SP-6 8ENDING AND STRAIGHTENING OF REINFORCING BARS PARTIALLY REV. NO. 3
  • TITLE: EMBEDDED IN CONCRETE AND Pt. ACING OF BARS t.IN HARDENED CON DATE 6/7/77 PROJECT TITLE:

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

- i R-2 6.3.1 Heat the bar to between 11000 and 12000 F slowly (approx. I hr.).

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

  • j R-2 6.3.3 i

Bend bar while between 1100*.and 12000 F.

R-2 6.3.4 Hold between 11000 and 12000 for 1/2 hour after bending.

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

R-2 6.3.6 Use acetylene or propane. for heating.

The temperature of the bar at the concrete Interface shall not exceed 5000 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 used to detemlne ,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 .,,

4 appil, cation of water or by exposure to sudden down pour of raln. ,

a-1 7.0 MINIMUM BEND DIAMETER

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

Bar Sizes 3-8 -

6 bar diameter

. Bar $lzes 9-11 -

8 bar diameter Bar Sizes 14 & 18 -

10 bar diameter 8.0 ACCEPTABILITY OF RARS

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-2 ., 8.1 ' Straightened bars shall be visually Inspected to determine whether they are cracked, reduced in cross section, or otherwise 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.

3 R-1 9.0 Pt. ACING 00WELS IN HARDENED CONCRETE R-1 9.1 Dowels that are to be placed in hardened concrete shall be drilled and epoxy grouted in place in accordance with the following conditions.

9.2 Holes for verlous si'ze dowels will be drilled as close as possible to design location and in accordance with the charts below:

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' , ' ,' J.  ;. JONES CONSTRU': TION COMPANY PAGE 3 0F 3 SPECIAL PROCESS PROCEDURE PROCEDURE NO.

W-SP-6 8ENDING AND STRAIGHTENING 0F REINFORCING BARS PARTIALLY REV. NO.

  • TITLE,.EM8EDDED IN CONCRETE AND PLACING OF SARS IN HARDENED t,DATE CONCRETE PROJECT TITLE **  !

WATERFORD SES UNIT NO. 3 CONTRAC1'40. W3-NY-4 CHART "A" Hole $12e am e (f u 4 4 6 7 B. 9 10 11 14 18 Minimun Hole Size . 1" I 1/8" le' 1 3/8" It' I 5/8" 1 3/4" l 7/8'I 2F' 23/4' R-2 9.3

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

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

R- 3 9.5 The hole will be coated with neat coat of sika-cur-Hi-Mod Epoxy mixed and applied in accordance with manufacturer's recommendations.

R-3 9.6 The hole will be filled half full with Type "P' Mortar prior to in-

, sorting dowel. The dowel will be Inserted in hole, being careful to Insure that the dowel is completely bottomed out, if necessary, add .*

  • mo.. Type "P' Mortar to completely fill hole.

R.3 9.7 ser will be adequately braced during set time of Mortar in order to Insure dowel is plumb.

10.0 ATTACmENTS None.

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