A06_ATT_2_Construction_Drawings_CRLA_Chimney_Stabilization_FY23.pdf

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SHEET INDEX

DESCRIPTIONSHEET

G1 TITLE SHEET

WHERE PUBLIC UTILITY FIXTURES OR FACILITIES ARE SHOWN AS EXISTING ON

THE PLANS OR ENCOUNTERED WITHIN THE CONSTRUCTION AREA, IT SHALL BE

THE RESPONSIBILITY OF THE CONTRACTOR TO NOTIFY THE OWNERS OF THESE

UTILITIES PRIOR TO THE BEGINNING OF ANY CONSTRUCTION INVOLVING

EXCAVATION. THE CONTRACTOR SHALL AFFORD ACCESS TO THESE FACILITIES

FOR NECESSARY MODIFICATION OF SERVICES OR RELOCATION. UNDERGROUND

FACILITIES, STRUCTURES AND UTILITIES HAVE BEEN PLOTTED FROM AVAILABLE

SURVEYS, RECORDS AND UTILITY OPERATOR LOCATION MARKINGS; THEREFORE

THEIR LOCATIONS MUST BE CONSIDERED APPROXIMATE ONLY. TYPE, SIZE AND

GENERAL LOCATION OF THE FACILITIES WERE REQUESTED OF THE OPERATORS

AND SHOWN ON THE PLANS, AND IF NECESSARY, UPDATED WITHIN 90 DAYS OF

COMPLETION OF THE FINAL PLANS. IT IS POSSIBLE THERE MAY BE OTHERS, THE

EXISTENCE OF WHICH IS PRESENTLY NOT KNOWN OR SHOWN. IT IS THE

CONTRACTOR'S RESPONSIBILITY TO DETERMINE THEIR EXISTENCE AND EXACT

LOCATION AND TO AVOID DAMAGE THERETO. NO CLAIMS FOR ADDITIONAL

COMPENSATION WILL BE ALLOWED TO THE CONTRACTOR FOR ANY

INTERFERENCE OR DELAY CAUSED BY THE WORK.

A1 PROJECT LOCATION

A2 PHOTOS

A3 SHORING PLAN

PROJECT LOCATION

A4 UNDERPINNING DETAILS

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PROJECT

CHIMNEY EXTERIOR

CHIMNEY INTERIOR

NOTE 2" SEPARATION

EXTERIOR CHIMNEY EXPOSED CONCRETE FOOTING SOIL BORING IN PROGRESS

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NOTE FORM REMNANT

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EXISTING BUILDING & SHORING SECTION

EXISTING MASONRY CHIMNEY

MOBILE HOME OR OTHER REMOVABLE SOIL

ANCHOR TIE-DOWN. INSTALL EACH SIDE OF

SHORING FRAMING, CONNECT WITH STEEL CHAIN

SECURELY FASTENED TO FRAMING TO RESIST

UPWARD THRUST DUE TO BRACE LOADING

EXISTING CHIMNEY FOUNDATION

2'

2X4 FRAMING 12" O/C VERT AND

ACROSS TOP/BOTTOM - NAIL

PLYWOOD TO FRAMING W/10D

AT 6" O/C

4X4 BLOCKING BETWEEN STUDS, 4X6 STRONGBACK

ACROSS BACK, CONNECT W/(3) 1/4"X6" SIMPSON SDS

SCREWS EACH STUD - CONTRACTOR TO PROVIDE SECURE

CONNECTION BETWEEN BRACE AND

BLOCKING/STRONGBACK

6X6 POST SET IN 12" DIA X 4' DEEP

CONCRETE FOOTING - ALTERNATIVE

BRACE FOOTING CAN BE PROPOSED BY

CONTRACTOR - FOOTING MUST BE

REMOVED AT END OF CONSTRUCTION.

4" DIA. STEEL PIPE MIN. OR

OTHER EQUIVALENT

STRENGTH STEEL BRACE

SCREW OR HYDRAULIC HAND

OPERATED JACK -

CONTRACTOR TO PROVIDE

SECURE CONNECTION

BETWEEN BRACE AND

ANCHOR POST

2" RIGID INSULATION FOAM (F-250 OR

SIMILAR) GLUED TO 3/4" PLYWOOD AFTER

PLYWOOD HAS BEEN NAILED TO STUD

FRAMING - FOAM PLACED DIRECTLY

AGAINST CHIMNEY

SPLAY BRACES APPROX

30 DEG. VERTICALLY AND

IN PLAN VIEW TO ALLOW

EQUIPMENT ACCESS

WOOD SHORING PER SECTION

ANCHOR POST AND FOOTING PER SECTION

BRACE PER SECTION

FOAM & PLYWOOD PER SECTION

TIE DOWN ANCHOR PER SECTION

EXISTING BUILDING SHORING PLAN

~30°

CHAIN CONNECTION

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INSITU SOIL INFORMATION

6" DIA., 3' LONG (MIN) HORIZONTALLY

AUGERED REINFORCING BEAM

8" DIA. X ~ 6' DEEP CIP PILE

(TYP OF 8)

NO. 4 BAR REINFORCEMENT

(STANDARD HOOKS)

ROUGHEN COLD JOINT & CLEAN PRIOR

TO PLACING CAP

15"

PLACE AGAINST FOOTING

BACKFILL & HAND COMPACT SOIL

EXCAVATE TO MINIMUM EXTENT

REQUIRED TO AUGER UNDER

FOOTING

RESTORE SURFACE UPON COMPLETION

TWO NO. 4 HORIZONTAL BARS AT 6"

DEPTH MAY VARY DUE TO

OBSTRUCTIONS. NPS ENGINEER TO

APPROVE FINAL DEPTH DURING

CONSTRUCTION

1 2 343214

NUMBER INDICATES POUR SEQUENCE

1'

EXTEND 1' BEYOND EDGE OF

CHIMNEY

CIP GRADE BEAM

6" DIA., 3' LONG (MIN) HORIZONTALLY

AUGERED REINFORCING BEAM &

PILE (TYP OF 8)

EXISTING MASONRY CHIMNEY

0-1' TOPSOIL

1' - 6' SANDY LOAM

WITH GRAVEL/CINDER

6' REFUSAL

SB1

EXISTING MASONRY CHIMNEY

UNDERPINNING SECTION DETAIL

UNDERPINNING PLAN VIEW

CIP PILE CAP. PLACE

AFTER CONSTRUCTING PILES

SHEET NOTES

1. REFERENCE SPECIFICATIONS FOR CAST-IN-PLACE CONCRETE REQUIREMENTS INCLUDING

SPECIALIZED MIX DESIGN. CONCRETE PLACED IN VERTICAL PILES AND HORIZONTALLY AUGURED BEAMS SHALL BE TREMIE POURED, PUMP PLACED WITH A 2” MAXIMUM DIAMETER HOSE AND VIBRATED

OR TAMPED AS NECESSARY TO ELIMINATE VOID POCKETS

2. CONTRACTOR SHALL TAKE ALL PRECAUTIONS NECESSARY TO PREVENT DAMAGE TO THE EXISTING HISTORIC CHIMNEY DURING CONSTRUCTION. THE FOLLOWING CONSTRUCTION SEQUENCE MUST BE

FOLLOWED:

A. INSTALL SHORING FORMWORK ON CHIMNEY, SEE SHORING DETAIL

B. PLACE STEEL PIPE OR BEAM BRACING TIGHT TO SHORING. ENGAGE SCREW TYPE JACK TO

ENSURE A SNUG-TIGHT COMPRESSION BETWEEN BRACING AND SHORING FORMS

C. EXCAVATE EXISTING GRADE TO BOTTOM OF CHIMNEY FOUNDATION. DO NOT OVER EXCAVATE.

DO NOT UNDERMINE FOUNDATION

D. UNDER NPS ENGINEER SUPERVISION USE HAND SCREW OR HAND PUMP HYDRAULIC JACKS TO

PUSH ON CHIMNEY AT THE TWO UPPER BRACE POINTS, WHILE KEEPING STRESS ON THE

LOWER BRACE POINTS. THE INTENT WILL BE TO MOVE THE CHIMNEY 1/2" TO 1" TOWARDS THE

BUILDING TO REPLUMB THE ENTIRE CHIMNEY.

E. AUGER HORIZONTAL BEAM HOLES FOLLOWED BY VERTICAL PILE HOLES OF THE SAME

SEQUENCE NUMBER. SEE PLAN DETAILS FOR HOLE SEQUENCE NUMBERS.

F. PLACE REINFORCING AND CONCRETE IN OPEN HOLES

G. ALLOW 48 HOURS MINIMUM BETWEEN NEXT BEAM/PILE PLACEMENT IN SEQUENCE

H. PLACEMENT OF CAP BEAM IS PERMISSIBLE ON SAME DAY AS FINAL BEAM/PILE PLACEMENT

I. ALLOW 7 DAYS MINIMUM BETWEEN CAP BEAM PLACEMENT AND SHORING REMOVAL AND

EXCAVATION BACKFILL

J. BACKFILL WITH NATIVE SOIL AND LIGHTLY COMPACT BY HAND

3. AUGURED HOLES ARE LIKELY TO SLUFF. AT HORIZONTAL AUGURED HOLES, CONTRACTOR SHALL ANTICIPATE FOR TWICE THE REQUIRED CONCRETE VOLUME TO ENSURE ADEQUATE MATERIAL IN THE FIELD TO COMPLETELY FILL THE HORIZONTAL EXCAVATION. AT VERTICALLY AUGURED HOLES, IT IS ACCEPTABLE TO UTILIZE 8” DIAMETER CARDBOARD FORMWORK (“SONOTUBE”) TO BE ABANDONED.

CONTRACTOR SHALL ANTICIPATE FOR CONCRETE VOLUME REQUIRED TO FILL 8” DIAMETER VERTICAL

HOLES.

4. BEDROCK/REFUSAL IS ANTICIPATED AT 5 TO 6 FEET BELOW GRADE. ROCKS MAY BE ENCOUNTERED PRIOR TO BEDROCK. AN NPS REPRESENTATIVE WILL BE ONSITE TO REVIEW AND ADVISE HOW TO

PROCEED SHOULD REFUSAL BE ENCOUNTERED PRIOR TO DEPTH REQUIREMENTS.

EXISTING CHIMNEY FOUNDATION

PLASTIC SPACER (TYP) AT

ENDS TO MAINTAIN 2" COVER

PLASTIC SPACER (TYP) AT

ENDS TO MAINTAIN 2" COVER