프리캐스트 그라우팅 펌프

프리캐스트 생산에서부터 그라우팅 작업까지  

Concrete Precast

Grout Injection​

Project Description

The innovation on this project was the use of APC techniques, specifically PCPS. UDOT chose to use precast pavement panels with a placement time of 7 to 10 hours. Using precast pavements allowed for offsite construction with a better cure environment and offpeak construction, compared to traditional cast-in-place construction with a minimum 7- to 10-day cure time and limited control of the cure environment.

UDOT's goals for using APC were the following:

Minimize traffic impacts by performing concrete curing offsite.

Use an improved cure environment with greater control of temperature, moisture, and cure time.

Reduce traffic disruptions from 7 to 10 days per panel to 7 to 10 hours.

Allow for offpeak construction with normal operations during normal traffic.

Minimize traffic impacts by reducing the overall construction schedule.

Improve construction zone safety by minimizing exposure time for workers and the traveling public.

Make the pavement replacement more constructible by working around difficult constraints.

Enhance the design quality by reducing dependence on weather and increasing the control of the quality of elements and systems.

Reduce traffic control costs by minimizing construction time.

Maximize the functional use of this vital corridor.

인터중공업주식회사 Website : www.inter-heavy.com 

Completed form ready for concrete pour.

​Pouring concrete in form to precast the panel.

Removal of grout tube and bolt locator jigs.

​Finished top of precast panel ready for curing.

Removal of existing deteriorated pavement (lane 3).

​Hauling of existing pavement (lane 3).

Placing and compacting the base course fill material.

​Leveling plates placed directly on top of the compacted base.

Placement of precast panel on the prepared base.

​Steering precast panel into place onto the prepared base.

Cutting panels to 1- to 1.5-in taper to account for horizontal curvature of existing roadway.

​Leveling bolts used to level the panels on the leveling plates.

Panels leveled using leveling bolts to within final grade tolerance of 0.25 in.

​Placing preformed strip seal to contain grout.​

Urethane grout injected through the grout injection hole.

​Urethane grout injection closeup.

Placement of dowel bars into dowel slot.

​Transverse joint with grout-filled dowel bar slots.

Placed panels and project open to traffic before diamond grinding for ride quality.

Using APC to address the pavement deficiencies and the knowledge and abilities of the contractor and designer, UDOT hoped to achieve best-value improvements. UDOT considered the use of PCPS for rapid repair because it is a technology that could improve safety, reduce congestion, and improve pavement performance, all of which are key elements of the HfL program.

Safety: UDOT expected that APC use would improve work zone safety primarily because of the reduction in construction time and exposure of workers and motorists to work zone hazards. In addition, APC use would allow for offpeak construction when traffic volumes are lower, which was also expected to reduce the potential for crashes.

Construction congestion: Normal construction would require phasing traffic with cure times of 7 to 10 days. The use of APC was expected to reduce this to 7 to 10 hours per panel, leading to a 90 percent reduction in construction time. With the use of precast panels, it was expected that the majority of work could be performed at night during offpeak hours. Once the panels were placed, the road would be opened to traffic the next day. Thus, the use of precast pavement panels with nighttime construction would allow all traffic lanes to be open during daytime, particularly peak, hours because of the absence of traditional cure times.

Quality: The project performance goal was to meet or exceed the more restrictive requirement of either the IRI or UDOT’s standards. The project also included diamond grinding of the existing concrete pavement, which was expected to reduce tire-pavement noise. However, this reduction would not be because of APC use, but the grinding itself.

User satisfaction: UDOT performs a pre-, mid- and postconstruction survey using a 1 to 7 scale to measure user satisfaction on major elements affecting stakeholders at various intervals during any major project. On this project, UDOT’s goal was to receive an average score of 4-plus on the postconstruction survey on how satisfied the user is with the new facility compared with its previous condition and how satisfied the user is with the approach used to construct the new facility in terms of minimizing disruption. UDOT used the mid- and preconstruction surveys as indicators of where and how to do a better job for stakeholders to reach the goal of 4-plus on the postconstruction survey.

UDOT's goal for the project was to demonstrate how APC technologies can be used to reduce construction impacts while improving safety and durability. UDOT planned to use APC with other programs, such as accelerated bridge construction. HfL's promotion of PCPS as a Vanguard Technology encouraged UDOT to submit an HfL project application.