As a part of BCRUA Phase 2, Raw Water Delivery System, Stiver Engineering was requested to provide forming for the top slab for Tunnel Shaft. An I – Beam frame was provided to help with the forming. Finite element analysis was performed to size the beam and connections. An anchorage design for the frame was also provided. The frame was designed in such a way that there is no conflict between the beams and the openings on the top slab.Stiver Engineering tackled various challenges with precision and innovation in the BCRUA Phase 2 Raw Water Delivery System project.
For the Tunnel Shaft’s top slab forming, Stiver Engineering utilized an I-Beam frame, meticulously sized through finite element analysis, and seamlessly integrated an anchorage design to ensure no conflicts with the top slab openings. Additionally, they engineered a custom lifting system for the Road Riser Vault’s Precast Cap, employing threaded stainless steel pipes cast into the cap for efficient installation and removal, complete with versatile hoist rings for easy lifting from various angles.
Stiver Engineering was requested to design alignment piles for the template structures of upper lake tap and lower lake tap. The template super structure spans 132 ft above mudline of the lake. Designing piles for such a tall structure within a lake has extreme challenges from adverse wind and hydrodynamic loading and extremely weak soil below the mudline. Stiver Engineering provided the design of 27 ft embedded 36 inch diameter alignment piles. This alignment piles were optimized to a depth just above the limestone layer which resulted in significant cost optimization while maintaining the deflection well within the spec.
As a part of BCRUA Phase 2, Raw Water Delivery System, Stiver Engineering was requested to provide Lifting Design and Steel Pipe Analysis for two 40ft pipe sections weighing almost 40kips, that needs to be placed vertically one upon the other. Stiver Engineering has proposed pad eye design for various scenarios from bring the pipe to the site until the placement of pipes in the shaft. A finite element analysis for performed on the pad eyes and the connection design.
As part of the offshore design for Brushy creek – Raw water delivery system, Stiver Engineering was asked to design a working platform/deck at the bottom of a drilled shaft to carry out pipe lifting procedure efficiently. Stiver Engineering helped the client in designing and analyzing the working platform which includes a 1” steel plate supported by W-section beams bolted to each other and the beams were anchored to the limestone present around the drilled shaft. The engineers performed a detailed finite element analysis of the deck which includes a partial opening at the center for installation of the 80-inch steel pipe into the drilled shaft. Stiver Engineering also provided anchor bolt design calculations for the rock anchor installed into limestone.
Stiver Engineering was consulted by the client to provide a lifting plan for two water intake towers. The project scope was to design a lifting cap with four lugs welded to the top of the cap and two trunnions on either side of the intake for tailing the picking load. Stiver Engineering performed Finite Element Analysis to design the lifting cap and the trunnions using the picking load provided by the client. The lifting cap was designed considering the pipe in vertical, horizontal and inclined alignments. Stiver Engineering also checked whether stress in the intake pipe would be within limits during lifting.
Stiver Engineer was asked to provide pipe lifting design for the installation of an 80-inch steel pipe into a drilled shaft as a part of the offshore design for Brushy Creek – Raw water delivery system. The pipe lifting was designed with pad eyes in such a way that the pipe can be lifted horizontally as well as vertically. The pipes were connected to W section beams through chains and lowered into the drilled shaft gradually. Stiver Engineering performed detailed analysis to check the efficiency of the W section beams.
Stiver Engineering was approached by the client to provide a design for an anchored concrete retaining wall located at the Maintenance Building Site for the BCRUA Phase 2 Raw Water Delivery System project. The purpose of the retaining wall was to ensure functionality during future excavation of adjacent fire tank. Stiver Engineering proposed and designed a permanent soil nail wall for this purpose using slope stability analysis and soil nail design software. The geotechnical and structural safety factors were checked to ensure the adequacy of the soil nail wall considering construction surcharge as well as foundation bearing pressure coming from Maintenance Building.
As part of the Brushy Creek regional utility authority – Phase 2 Raw water delivery system project, Stiver Engineering was approached by the client to provide pipe support design for a 78-inch steel pipe (Water line) enclosed in a 132-inch steel casing. The purpose of the pipe support was to restrict the movement of pipe due to any buoyant forces produced during the grouting operation of the annulus.
Stiver Engineering went ahead and performed the Finite element analysis for the pipe, considering the buoyant force acting on the pipe and the number of ratchet straps (pipe support) proposed by the engineers. Stiver Engineering also performed the anchor bolt design calculations and confirmed that the anchor bolts were adequate to handle the anticipated tension and shear loads.
Stiver Engineering Inc. was consulted by the client to design the flood cap for a grouted 93-inch steel riser pipe as a part of Brushy Creek regional utility authority – Phase 2 raw water delivery system. The project’s aim was to prevent the riser pipe from flooding and support the 24-inch ventilation pipe above. Stiver Engineering proposed and designed two options for the flood cap – one with the friction collar and the other with the bolted flange. Stiver Engineering provided the analysis of the flood cap for the lifting/installation and for the full hydrostatic load during flooding event. Stiver Engineering performed the finite element analysis of the flood cap and proposed the stiffener plates and designed the flood cap to be structurally adequate for proposed options.
