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The Trinity Episcopal Church in Pass Christian, Miss., once stood on piers about 4 feet above grade and 14 feet above sea level. In August 2005, Hurricane Katrina's 26-foot storm surge washed away the walls but left the church's laminated-arch frame virtually intact. During reconstruction the church was raised another 10 feet to assure it would withstand future storms.
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The shoring crew first disconnected the floor framing from the foundation by cutting the steel bolts embedded in the short concrete piers.
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The crew installed cribbing and hydraulic jacks for lifting the building.
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Each jack was connected to a hydraulic manifold powered by a diesel engine.
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The jacks were able to lift the 3,000-square-foot structure more than 10 feet with less than 3/8-inch difference in elevation between any of the 10 lifting points.
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The rebar for new grade beams and pier extensions was epoxied to the original piers.
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Formwork for the pier extensions stopped a foot shy of the raised building to allow for setting the anchor bolt-studded cap plates and pumping the concrete.
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Diagonal steel rods provide lateral bracing for the exposed portions of the piers; note the cold joint at the base of each pier between the old pier and the pier extensions.
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Steel brackets welded to the cap plates anchor the transept framing to the foundation.
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Cantilevered steel plates (left) welded to the cap plates and existing steel framing brackets in the original floor system provide support for the glulam rim joists (right) that support the new SIP walls.
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With the glulam rims secured to the original structure and the new transept floor framing completed, the building is ready for wall A and roof panels.
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The floor was 14 feet above grade, so man lifts were essential for safe handling of the large panels.
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The wall panels are lifted into place with man lifts.
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Panel edges were relieved at the bottom to fit over the glulam rim joist, and at the sides and top for the 2-by connecting splines.
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The wall panels were first glued and nailed to the glulam band and splines, then fastened to each other and to existing framing with structural screws.
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The stiffeners were bolted to the glulam and recessed into the wall panels.
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To prevent wind deflection, the tall window walls were reinforced with full-length flitch beam stiffeners.
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Preinstalled 2-by walk boards reinforced the connection between the lifting hooks and the OSB skins of the roof panels.
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View of roof panel emplacement.
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Placing the hooks slightly off-center eliminated camber in the panel, making it easier to slide the edge over the spline of the previous panel.
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The second-story floor system in the transept addition hangs between the top of the first-floor wall panels.
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The second-floor structure of the transcept addition is supported by 6x16 glulam beams that span the openings of the arches of the original church frame.
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The 32-foot-long structural ridge beam fit into reinforced pockets in the gable SIPs.
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The nonstructural skirt wall and lowered entry deck make the church appear lower to the ground than it actually is.
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There's elevator access from the finished slab underneath the building.
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With the arches and finish ceiling intact — and the original stained-glass window back in place — the interior looks almost unchanged.