Boulderscape Project
Alcatraz
Pier 33, The Embarcadero, San Francisco, CA 94133
Phase II Stabilize Cliff Below Warden’s House Alcatraz. Installation of an 8” structural shotcrete and a 1”- 4” thick Pacific Granite sculpted finish.
8
Record Installation Time
56
Avg. Savings Over Alternative Wall Finishes %
10515
Wall Square Footage
In Depth Analysis
Boulderscape Services
The California State Parks was concerned with the chances of a slope failure happening below the old Warden’s House on Alcatraz Island. A soil nail wall shoring design was created to hold the slope in place. Since Alcatraz Island is the most visited state park in California, it was very important that the finish on the soil nail wall blended in with the existing rock in the area and didn’t draw attention. Boulderscape was chosen as the contractor to create a finish that would blended in with the environment. Boulderscape mock-ups were produced with a Pacific Granite finish and shipped to the island. The mock-ups were approved by State Parks and the shotcrete process began. We placed over 380 - 2,800 pound totes of 5,000 psi specialty shotcrete to create the structural and architectural finish.
Boulderscape Service Overview
Services Provided
Installation of an 8” structural shotcrete and a 1”- 4” thick Pacific Granite sculpted finish.
Boulderscape Finish
Pacific Granite
Color Scheme
Medium Earth Blend
Shotcrete Thickness
13"
Average Relief
3"
Shoring System
Rock Bolt
Shotcrete/Concrete Mix Design
5,500 PSI
Weather
Silica Fume was added to make the concrete more durable resist strong storm surges.
CLIENT EXPERIENCE
