Cell Blocks® Used for Major Telecommunications Carrier

Rural Ridge Top in Idaho

Highlights

PROJECT LOCATION

Idaho

OWNER

Major Telecommunications Carrier

GENERAL CONTRACTOR

Strata, Inc.

The Problem

As a result of a lease not being renewed on an existing tower, a major telecommunications carrier needed a temporary solution to continue to provide cell services in a rural area of Idaho. The carrier desired a definitive solution, a small footprint, no digging and an easy removal solution. The site was also identified as having Indian artifacts. Furthermore, the site was on top of a ridge reachable only by a dirt lane. Cell Blocks® provided a foundation that minimized disruption to the existing ground and allowed for future site removal with very little impact on the land.

The Design

Structural drawings and calculations were provided to the carrier and the on-site contractor Strata, Inc. The blocks were prefabricated at a precast manufacturing facility near Reno, NV. Anchor bolts and templates were provided to the precast facility by the monopole supplier and cast in. The post tension GR 150 galvanized steel bars, hex nuts and plates were ordered from DSI America, Inc.

The Solution

After the (9) Cell Blocks were prefabricated they were transferred up the mountain by a straight bed truck carrying two blocks each trip. The Strata Inc. work crew transferred and placed the nine Cell Blocks in one day atop the pre-prepared granular base material. The minimum allowable soil bearing requirement was 1500 psf.

The post tension bars, hex nuts and plates were immediately inserted to begin the hydraulic post tensioning process. The post tensioning sequence was completed the next morning. Cell Blocks provided a certified hydraulic pump and 100 ton jack to post tension the steel bars to the specified tension force of over 132,000 pounds each.

After the Cell Blocks foundation is post tensioned it is immediately at full load strength and ready for installation of the monopole. The tower was set immediately after the blocks were post tensioned using the same crane that set the blocks.

The structural advantage of the Cell Block foundation was that once post tensioned, the foundation was instantly full strength. Cell Blocks Inc. provided an experienced representative, on-site, for the duration of the block installation and post tensioning process. The representative was able to ensure proper construction and assure the quality of the completed foundation.

Using post tensioned precast concrete CELL BLOCKS for this wireless facility facilitated the installation to be extremely dependable, preserved the safety of the Indian artifacts, and is removable in the future.

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