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HomeMy WebLinkAboutSN 3931 Narrative Averill Walkover over Holmes 2017 BIENNIAL BRIDGE INSPECTION SUMMARY AVERILL WALKOVER OVER WEST HOLMES ROAD STRUCTURE NUMBER – 3931 CITY OF LANSING, MI October 13, 2017 Tetra Tech 401 South Washington Square, Suite 100, Lansing, MI 48933 Tel 517.316.3930 Fax 517.484.8140 www.tetratech.com The Averill Road Walkover over West Holmes Road is a painted steel truss. The walkover was constructed in 1967 and partially painted in 2003. The walkover is in generally fair condition. SUPERSTRUCTURE At the south stair, there is corrosion and section loss which was painted over at the northeast inside corner of the intermediate platform framing. There are newer bolts at the connection of the bottom stairs to the intermediate platform and of the upper stairs to the main span. There is a broken grounding wire at the south stair support. The south main span support consists of two vertical columns on the north side and two diagonal members on the south side and oriented north-south. The east diagonal brace is rusted through at the bottom on the south, east and west sides. The east vertical column has a rust hole on the bottom at the west side, which appears to originally been a drain hole that got larger. On the north stair, the 3rd tread from the bottom is dented. The welding of the north upper stair to the intermediate platform is incomplete. At the top platform, there is a broken deck plank at the southwest corner. There is corrosion and some minor section loss at a welded joint in the north hand railing at the intermediate platform. The grounding wire at the north stairs is broken. The north main span support consists of four vertical columns. There are also two diagonal braces oriented north-south. The two southern columns support the main truss while the two northern columns support the upper stair platform. The bottom of the east diagonal brace has rust holes on the east, west and south sides where it connects to the southeast vertical column. At the main span truss, the second bottom diagonal cross-brace from the south is rusted through on the northeast side towards the north end. There is scattered rust on the deck planking and at the top chord connection plates. Some of the wire ties at the bottom of the pedestrian fencing are missing at the stairs (2 total counted). FOUNDATIONS The stair stringers are supported by concrete curbs. At the south stair, the curb is cracked at the north stringer and broken completely off adjacent to the south stringer. There is also a crack in the middle towards the south stringer. There is spalling of the sidewalk slab at the base of the south stairs. At the north stair, the curb has some honeycombing and spalls at the south end. At the south main span concrete foundation pedestals, the north pedestal has a spall on the northwest corner behind the guardrail. At the north main span concrete foundation pedestals, the south pedestal has cracking and small spalls on the top at the southeast and southwest corners. Tetra Tech 401 South Washington Square, Suite 100, Lansing, MI 48933 Tel 517.316.3930 Fax 517.484.8140 www.tetratech.com There is guardrail in front of both the south and north concrete foundation pedestals. The north guardrail is rusty and does not have a bullnose ending at either end. RECOMMENDATIONS:  Perform welded repairs: o East diagonal column at south main span support. o East diagonal brace at south main span support. o East diagonal brace at north main span support.  Reattach broken grounding wire.  Replace sidewalk slab at base of south stairs.