PDX 2026-501 (181) C12.02.pdf
PDF 360 KB Posted
- Solicitation number
- 147231
- Issued by
- Multnomah County, Oregon
About this file
This is a technical design drawing for the Portland International Airport North Runway Rehabilitation project in Oregon, specifically detailing communications vault repair work. The drawing, prepared by HNTB Corporation and dated October 2026, provides construction details for the repair and rehabilitation of an existing precast concrete communications vault (MH D-2) that contains critical Port and FAA communications services. The vault has sustained damage to its south wall and precast concrete cover, requiring structural reinforcement and replacement. The repair work includes excavation to expose the damaged wall, removal of an existing 12-inch concrete shield wall using hand-held equipment only, construction of a new concrete repair wall doweled to existing structure, and replacement of the precast concrete vault cover. All work must be performed without disrupting the critical communications services housed within the vault at any time during construction.
The technical specifications require concrete meeting P-610, 4,000 PSI standards with ASTM A615, Grade 60 reinforcing steel. The repair procedure mandates hand excavation for all work deeper than two feet below ground surface, careful protection of existing conduits, and restoration of ground surface elevations to match pre-construction conditions. The project includes backfilling with sand compacted to 95 percent maximum density, sealing joints with either preformed joint seals or non-sagging silicone sealant, and final acceptance by Port authority upon completion. The drawing includes detailed sections, bend diagrams for reinforcing steel, and comprehensive notes addressing excavation procedures, conduit protection, structural connections, and final restoration requirements specific to this critical airport communications infrastructure.
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Text version
10/6/2026
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DESIGN NUMBER PROJECT NUMBER
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2:27:27 PM NCHOWDHURY c:\users\nchowdhury\dc\accdocs\hntb corporation\88598 - pdx north runway rehab\project files\shared cad\sheets - telecom\faa vault.dwg
DISC. SHT. NO.
DRAWING SCALE IS REDUCED 50% WHEN SHEET SIZE IS 11" x 17"
DESIGN BY
DRAWN BY
CHECKED BY
DATE
SHEET NO.
SUBMITTED BY
DRAWING NO.
TYPE:
1/
4" 1/
2" 1"
1/
4" 1/
2" 1"
DATE BY REVISION APPDATE BY REVISION APP ##
IF ELECTRONIC SIGNATURE IS BROKEN OR MISSING - THIS IS NOT A LEGAL DRAWING
PORTLAND INTERNATIONAL AIRPORT
NORTH RUNWAY REHABILITATION
COMMUNICATIONS VAULT REPAIR DETAILS
GENE TUPPER
C. EISELER
N. CHOWDHURY
H. CONRADT
OCTOBER 2026
181 CD
PDX 2026-501 C12.022024D011 102981
RISER, SEAL, AND COVER
REMOVE AND RETAIN FOR
REINSTALLATION
EXISTING GRADE
FINISH GRADE TO MATCH
5- S0
5"
3"
3"
7-5S054 @ 17"
8'-6"
7 - DRILL AND EPOXY 4L017 @ 17"
(3" EMBEDMENT)
3"
3"
3"
6.
5"
3' -9
- D R
IL
L
AN
D
E
PO
XY
L0
5" (3
" E M
BE
D
M
EN
T)
6.
5"
5' -1
0"
BB
A
A
NOTE(S):
1. CONCRETE SHALL BE P-610, 4,000 PSI
2. REINFORCING STEEL SHALL BE ASTM A 615, GRADE 60
3. EXISTING WALL REPAIR THICKNESS ASSUMED TO MATCH
THICKNESS OF PRECAST WALL, 4" AS SHOWN.
4. CONDUIT LOCATIONS SHOWN ARE APPROXIMATE.
RETAIN AND PROTECT CONDUIT. ADJUST PLACEMENT OF
REINFORCING TO ACCOMODATE CONDUIT AS NEEDED.
6"6"6"
2"
3"
5- S0
5"
4- D
R
IL
L
AN
D E
PO
XY
L0
5"
3"
3" EMBEDMENT
DRILL AND EPOXY 4L017 @ 17"
3" EMBEDMENT
SECTION A-A
7-5S054 @ 17"
5S086
DRILL AND EPOXY 4L017 @ 15"
EXISTING 4" CAST-IN-PLACE REPAIRED WALL
9'-0"
EXISTING PRECAST WALL
6"
2"
3"
3" E
M
BE
D M
EN
T
3"
3" E
M
BE
D M
EN
T
DRILL AND EPOXY
4L017 @ 15"
SECTION B-B
SCALE:
VAULT WALL REPAIR
N.T.S.3
BEND DIAGRAM
1'-0"
0' -7
4L017
5'-0"
7' -2
REMOVE AND REPLACE
PRECAST CONCRETE COVER
EXISTING 4" CAST-IN-PLACE
REPAIRED WALL. RETAIN AND
PROTECT
REMOVE EXISTING 12"
CONCRETE SHIELD WALL
4 - 4" PVC CONDUITS, EXISTING
RETAIN AND PROTECT
SCALE:
EXISTING VAULT SECTION VIEW
N.T.S.2
9'-0"
5' -0
EXISTING VAULT 4484-TA
PROVIDE NEW PRECAST
CONCRETE COVER
4 - 4" PVC CONDUIT
EXISTING
STRENGTHEN SOUTH WALL
PER DETAIL 3
C12.02
SCALE:
EXISTING VAULT PLAN VIEW
N.T.S.1
NEW WALL
NEW WALL
PRECAST CONCRETE VAULT COVER
REPLACE EXISTING WITH NEW TO MATCH
4" PVC CONDUIT, TYP.
SEE NOTE 4
GENERAL NOTE(S):
1. EXISTING VAULT MH D-2 CONTAINS CRITICAL PORT AND FAA COMMUNICATIONS SERVICES. THESE
SERVICES SHALL NOT BE DISRUPTED AT ANY TIME DURING CONSTRUCTION.
2. THE VAULT HAS DAMAGE TO THE SOUTH WALL AND THE PRECAST CONCRETE COVER. THE VAULT
SHALL BE REPAIRED BY ADDING A NEW CONCRETE WALL TO STRENGTHEN THE EXISTING
DAMAGED WALL AND REPLACING THE PRECAST CONCRETE COVER.
3. SHEET C12.03 SHOWS DETAILS OF THE ORIGINAL VAULT, FOR REFERENCE.
4. THE REPAIR PROCEDURE SHALL INCLUDE THE FOLLOWING:
a. SURVEY AND RECORD EXISTING GROUND SURFACE ELEVATIONS AS THE FIRST ORDER OF
WORK. FOLLOWING THE REPAIR, THE GROUND SHALL BE RESTORED TO MATCH
PREVIOUSLY-EXISTING CONDITIONS.
b. EXCAVATE TO EXPOSE THE WALL TO BE REPAIRED. ALL EXCAVATION DEEPER THAN 2' BELOW
GROUND SURFACE SHALL BE HAND EXCAVATION ONLY. EXCAVATION MAY ENCOUNTER CLSM.
DEWATER AS NEEDED. DO NOT EXCAVATE MORE THAN NECESSARY FOR THE REPAIR. DO NOT
DAMAGE EXISTING CONDUITS THAT WILL BE WITHIN THE EXCAVATION.
c. REMOVE EXISTING 12” CONCRETE SHIELD WALL. CONDUCT ENTIRE REMOVAL BY MEANS OF
HAND-HELD EQUIPMENT ONLY. DO NOT DAMAGE EXISTING CONDUITS THAT PASS THROUGH
THE WALL. DO NOT DAMAGE EXISTING VAULT WALL TO REMAIN.
d. CONSTRUCT WALL REPAIR IN ACCORDANCE WITH DETAIL 3 ON THIS SHEET. THE REPAIR WALL
SHALL BE DOWELED TO THE EXISTING STRUCTURE AS SHOWN.
e. FOLLOWING CURE AND ACCEPTANCE OF THE REPAIR WALL, BACKFILL THE EXCAVATION TO 6”
BELOW THE TOP OF THE WALL. BACKFILL WITH SAND PER ITEM P-152, COMPACTED TO 95%
MAXIMUM DENSITY.
f. EXCAVATE TO EXPOSE PRECAST CONCRETE VAULT COVER, TOP AND ALL SIDES. DO NOT BEGIN
THIS EXCAVATION UNTIL THE REPLACEMENT PRECAST CONCRETE COVER IS ON SITE.
g. REMOVE AND RETAIN EXISTING RISER, SEAL, AND COVER FOR REINSTALLATION.
h. PROVIDE NEW PRECAST CONCRETE COVER MATCHING EXISTING COMMUNICATIONS VAULT.
SEE SHEET C12.03 FOR EXISTING COMMUNICATION VAULT DETAILS. REMOVE AND DISPOSE OF
EXISTING PRECAST CONCRETE COVER.
i. MODIFY THE SEAT OF THE NEW PRECAST CONCRETE COVER TO MATCH MATING CONDITIONS
ON THE EXISTING VAULT WALLS.
j. INSTALL NEW PREFORMED JOINT SEAL WHERE THE SEAL CAN BE ACCOMMODATED. WHERE
PREFORMED JOINT SEAL CANNOT BE ACCOMMODATED, USE NON-SAG SILICONE SEALANT TO
SEAL THE JOINT BETWEEN THE PRECAST CONCRETE COVER AND THE TOP OF VAULT WALL.
k. INSTALL NEW PRECAST CONCRETE COVER. INSTALL EXISTING RISER, SEAL, AND COVER.
l. BACKFILL TO 6” BELOW FINISHED GROUND SURFACE WITH SAND PER ITEM P-152, COMPACTED
TO 95% MAXIMUM DENSITY. BACKFILL REMAINING DEPTH TO FINISHED GRADE WITH CRUSHED
AGGREGATE BASE COURSE PER ITEM P-209, NOMINAL 6” DEPTH, COMPACTED IN PLACE BY
NON-VIBRATORY ROLLING.
m. CLEAN VAULT INTERIOR OF ALL DEBRIS.
n. OBTAIN PORT ACCEPTANCE OF COMPLETED CONDITION.
EXISTING AND
NEW PRECAST LID
EXISTING
PRECAST FLOOR
EXISTING 4"
CAST-IN-PLACE
REPAIRED WALL
EXISTING
HATCH RISER
AND COVER
EXISTING PRECAST WALL
RE
G ISTERED PROFESS IONALENG I NEER
MARCH 9 , 1999
60434PE
OREGON
12/31/27EXPIRES:
HA NS N . CONRA DT
| 2026-10-06T18:09:48-0700 | |
| Hans N Conradt |
File details come from the government source that posted it. Updated .