Attachment L - Post Middle School Tunnel Bulkhead Sketch.pdf
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- Solicitation number
- RFP DET 260000002640 1
- Issued by
- Wayne County, Detroit City, Michigan
About this file
This is a structural design drawing for a tunnel bulkhead installation at Post Middle School prepared for the Detroit Public Schools Community District. The drawing (SK-1, dated 09/3/2026) specifies the construction of a 12-inch fully grouted Concrete Masonry Unit (CMU) bulkhead wall with #5 reinforcement bars spaced 16 inches on center in each direction, centered within the wall. The bulkhead will be anchored to the existing tunnel structure using 32-inch long #5 dowels drilled and epoxied into the tunnel substrate at 16-inch maximum spacing, utilizing either Hilti HIT-HY 200 epoxy for concrete or HIT-HY 270 for masonry substrates. The existing tunnel dimensions are verified in the field (VIF) at 8 feet 2 inches and 8 feet 0 inches inside dimensions. Open-end CMU blocks are specified for top courses at dowel locations.
The contractor is responsible for field verification of all existing conditions, including substrate material composition (assumed unreinforced masonry or cast-in-place concrete), thickness, condition, and all dimensional discrepancies prior to installation. The contractor must remove all abandoned mechanical, electrical, and plumbing (MEP) systems within the tunnel section and is fully responsible for demolition, removal means and methods, temporary shoring, and safety. The design assumes the existing tunnel structure is sound and free of deterioration; any unsound or deteriorated material must be reported to the engineer prior to anchor installation. The structural engineer's scope is limited to the bulkhead wall design and anchorage only, with drainage systems and non-structural work excluded from this design.
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Text version
REVISIONDATE
DRAWING NO.:
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TUNNEL BULKHEAD
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DRAWN BY:
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CHECKED BY:
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APPROVED BY:
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SK-1
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JAL
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JAL
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ARB
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POST MIDDLE SCHOOL TUNNEL BULKHEAD
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FOR CONSTRUCTION
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GENERAL NOTES:
1. EXISTING TUNNEL STRUCTURE IS ASSUMED TO BE CONSTRUCTED OF UNREINFORCED MASONRY OR CAST-IN-PLACE CONCRETE. EXISTING CONDITIONS HAVE NOT BEEN VERIFIED. CONTRACTOR SHALL FIELD VERIFY ACTUAL SUBSTRATE MATERIAL, THICKNESS, AND CONDITION PRIOR TO INSTALLATION OF ANCHORS/DOWELS AND SHALL NOTIFY THE ENGINEER IMMEDIATELY IF ACTUAL CONDITIONS DIFFER FROM THOSE ASSUMED HEREIN.
2. CONTRACTOR SHALL VERIFY THAT THE EXISTING TUNNEL STRUCTURE AT THE BULKHEAD LOCATION IS SOUND AND FREE OF DETERIORATION, CRACKING, DELAMINATION, SPALLING, OR OTHER DEFECTS, AND IS CAPABLE OF DEVELOPING THE ANCHOR CAPACITIES REQUIRED HEREIN. ANY UNSOUND OR DETERIORATED MATERIAL SHALL BE REPORTED TO THE ENGINEER PRIOR TO PROCEEDING WITH ANCHOR INSTALLATION.
3. ANCHORAGE INDICATED IS INTENDED TO BE SUITABLE FOR INSTALLATION INTO EITHER CAST-IN-PLACE CONCRETE OR CMU/MASONRY SUBSTRATE. CONTRACTOR SHALL CONFIRM THAT ANCHOR MANUFACTURER'S PUBLISHED CAPACITIES AND INSTALLATION REQUIREMENTS ARE VALID FOR THE ACTUAL SUBSTRATE ENCOUNTERED IN THE FIELD. SUBMIT ANCHOR PRODUCT DATA TO THE ENGINEER FOR REVIEW IF THE ACTUAL SUBSTRATE DIFFERS FROM CAST-IN-PLACE CONCRETE.
4. THE ENGINEER HAS RELIED UPON THE ASSUMPTION THAT THE EXISTING TUNNEL STRUCTURE IS SOUND AND REQUIRES NO REPAIR. THIS DRAWING DOES NOT CONSTITUTE AN ASSESSMENT, EVALUATION, OR CERTIFICATION OF THE EXISTING TUNNEL STRUCTURE'S CONDITION.
5. THE STRUCTURAL ENGINEER'S SCOPE OF SERVICES IS LIMITED TO THE STRUCTURAL DESIGN OF THE NEW CMU BULKHEAD WALL AND ITS ANCHORAGE TO THE EXISTING TUNNEL STRUCTURE. DRAINAGE SYSTEMS, AND ALL OTHER NON-STRUCTURAL WORK ARE BY OTHERS AND ARE NOT INCLUDED IN THIS DESIGN.
6. CONTRACTOR SHALL REMOVE ALL ABANDONED MECHANICAL, ELECTRICAL, AND PLUMBING (MEP) PIPING, CONDUIT, DUCTWORK, HANGERS, AND OTHER EMBEDDED OR ATTACHED ITEMS WITHIN THE TUNNEL SECTION TO PROVIDE A CLEAR, UNOBSTRUCTED AREA FOR INSTALLATION OF THE NEW CMU BULKHEAD WALL. COORDINATE REMOVALS WITH OWNER AND OTHER TRADES AS REQUIRED.
7. CONTRACTOR IS RESPONSIBLE FOR THE MEANS, METHODS, AND SAFETY OF ALL DEMOLITION AND REMOVAL OPERATIONS, INCLUDING ANY TEMPORARY SHORING OR SUPPORT REQUIRED TO PERFORM THE WORK.
8. CONTRACTOR SHALL FIELD VERIFY ALL EXISTING DIMENSIONS, INCLUDING TUNNEL WIDTH, HEIGHT, AND WALL THICKNESS, PRIOR TO FABRICATION OR ORDERING OF MATERIALS. NOTIFY THE ENGINEER IN WRITING OF ANY DISCREPANCIES BETWEEN FIELD-VERIFIED DIMENSIONS AND THOSE SHOWN PRIOR TO PROCEEDING WITH THE WORK.
9. ANY CONDITION ENCOUNTERED IN THE FIELD THAT IS NOT ADDRESSED BY THIS DRAWING, OR ANY CONFLICT BETWEEN EXISTING CONDITIONS AND THE WORK SHOWN, SHALL BE BROUGHT TO THE ATTENTION OF THE ENGINEER FOR RESOLUTION PRIOR TO PROCEEDING WITH WORK IN THE AFFECTED AREA.
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EXISTING TUNNEL STRUCTURE
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GRADE ABOVE TUNNEL
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8'-2" INSIDE DIM, VIF
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8'-0" INSIDE DIM, VIF
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12" FULLY GROUTED CMU BULKHEAD WALL W/ #5 BARS @ 16" OC EA WAY CENTERED IN WALL
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16" OC MAX, TYP
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USE OPEN-END CMU FOR TOP COURSES AT DOWELS
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DETROIT PUBLIC
SCHOOLS
COMMUNITY
DISTRICT
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