HOUSTON – Webber LLC has completed construction on the SH249 Tomball Tollway Mainlanes. Harris County Toll Road Authority (HCTRA) is the owner.Area manager Troy Gjerde says the project included .5 of a mile of construction on the main lanes on SH249 from south of North Pointe Blvd. to north of Three Lakes Blvd.
The project included a 41,016-sf bridge, an un-manned toll structure spanning eight lanes at approximately 300 ft. wide, which included concrete IT buildings, and four concrete columns.
There was 23,442 CY of roadway excavation, 118,592 CY of channel excavation and 200,182 CY of roadway embankment, 102,258 SY of concrete paving, and 63,859 sf of MSE Wall.
“The project also included widening an existing retention pond by six acres for a total size of 12 acres,” Gjerde said. “In the detention pond there was 14,939 CY of clay liner required on the bottom and slopes to minimize erosion and ground water seepage.
“A $1.4 million change order was added to the contract to widen the north bound and south bound frontage road at Northpointe Blvd. in order to maximize the flow of traffic at the crowded intersection.”
According to Gjerde, the main challenge on the job was completing the toll plaza. This required coordination with two major subcontractors, as well as Webber crews working on the concrete structures.
The Toll Plaza is comprised of four concrete columns at a compound angle, two cast in-place concrete IT buildings and a steel pipe gantry.
“There were several design and erection concerns that needed to be mitigated with the owner and suppliers,” he said. “The rebar drawings for the columns required a full design from the rebar company since the plan drawings were lacking information.”
The rebar supplier was able to do a complete model, and suggested terminators at the top of the columns in order to reduce the rebar congestion at the top of the columns.
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