When projects require a retaining wall, a cost-effective solution is desirable; if it also enhances the visual appearance of the site, all the better. Allan Block’s retaining wall products have a range of collections to satisfy any aesthetics required. Options can be split-faced (AB Collection, AB Europa Collection), non-split faced (AB Aztec, AB Metro), and even environmentally friendly (AB Fieldstone). For added aesthetics, each collection can be installed using patterns to provide more visual interest.

Geogrid reinforced walls have a larger footprint than other wall types, which means there is a greater chance of grid interacting with other site features, such as grid obstructions and grid penetrations. We always recommend that you work with the geogrid manufacturer for their advice, but here are several types of grid penetrations depending on the application that we have been involved with.

Grid penetrations vary in size and severity but most cases they are simple obstructions like small fence posts or root balls for plants and trees. In cases where partial geogrid modifications are required, it is permissible to make a small cut in the strong direction, cutting the weak filaments of the grid to accommodate the obstruction.

In some instances, larger geogrid penetrations are required for things like concrete post footings and storm water drop structures. Larger structures like these require the wall installer to build a frame in the geogrid around the structure to pass the loads beyond the structure. The frame is typically constructed with a ¾ inch galvanized continuous threaded bar on each side of the opening. The cross bars can be constructed using 4 inch (100 mm) galvanized pipe. The geogrid is then connected to the bar by either wrapping around the bar or by some means of mechanical connection.

A common challenge for retaining wall construction occurs when a fence is built above the retaining wall after the wall is constructed. In most cases the post footing for the fence has to be hand dug to try to mitigate damage to the geogrid. It is not recommended to use a power auger in these situations as the auger will cause a lot of damage to the geogrid and it also has the potential to pull the grid out of its intended location. In any situation when a vertical obstruction occurs, planning ahead is important to minimize the impact on the geogrid layers.

A unique situation where the obstruction runs parallel with the retaining wall, like storm water drainage pipes, can be accommodated as well. When the obstruction is larger than the geogrid space provided, it is permissible to splay the geogrid around the obstruction. The angle of splay should not exceed 5:1 and a minimum of 4 inches (100 mm) of space should be allowed between the obstacle and geogrid.

For more information, contact our engineering department at (800) 899 5309 ext. 3 or engineering@allanblock.com.

As another hardscape season comes to an end, we here at Allan Block are shifting gears. A vital focus at the end of the year is always training. As in many professions, engineers and architects require Continuing Education Units (CEUs) to maintain their licenses and Allan Block is making obtaining those CEUs “Always Better”.

For over 30+ years Allan Block has been developing an in-depth training program, compiling a list of desired topics, and providing an ideal learning environment. Each class lists its IACET training requirements for Continuing Education Units as well as highlighting the key elements covered. Some topics that you can expect to see include:

• AB CADD (Newest Feature to AB Walls 3D+Terraces)
• Terraces and Global Stability
• Best Practices for SRW Design
• AB Walls 3D+Terraces (Covering the basics of the software)
• And so much more

Check out our training syllabus online in our Designer Resources page to register today. All the topics outlined can be used as subjects for lunch and learns. If you would like to schedule a Lunch and Learn session for your team, take a look at our Lunch and Learn Registration.

For more information, or if you would like to schedule training, feel free to contact our engineering department at (800) 899 5309 or engineering@allanblock.com.

All the engineers that we have spotlighted over the years follow Best Practices closely, but few have the in-depth knowledge like GeoWall Designs. Founder, Kyle Huerd knew before he started his engineering career that he wanted to be involved in both the construction and design aspects of projects.

As a 6-year U.S. Army veteran, Kyle decided to head back to school to meet his life and career goals. He graduated in 2012 from the University of Minnesota (Duluth), Go Bulldogs, with his Bachelor of Science in Civil Engineering. Like most college students in their senior year, he was cramming for finals and skipping meals in the process. After completing his last exam, Kyle found himself wandering into a free lunch and learn conducted by who else but Allan Block. A few weeks later Kyle started with us, and we were lucky enough to have him with our team for five wonderful years. Kyle enjoyed the family-like appeal of the company but found a great opportunity in the construction industry and thus started his own company GeoWall Designs in 2018.

Today GeoWall Designs provides preliminary and final designs as well as oversight for many aspects of the construction industry. With licenses in over 17 states and an increased effort towards Geo investigations, GeoWall Designs is becoming a leader in the geotechnical service and design industry. GeoWall Designs is always looking to support the Best Practices within the industry in all phases of a project. When asked how Allan Block has helped him develop as an engineer, Kyle stated that “The training and knowledge that I received working with Allan Block is next to none”. GeoWall Designs has also partnered with Earth Retention (formerly ERS) which works to provide U.S. based construction supplies to most areas of the continental US.

For new engineers, Kyle recommends “be a sponge.” Soak up as much information as you can by asking questions on both the theoretical principles and practical construction techniques of projects. He also expressed his appreciation to the contacts and partners he has made over the years, emphasizing his gratitude to his employees who make GeoWall Designs the company it is today. Career goals now involve being able to provide a fun workplace where as many families as possible can succeed. Kyle has really embraced the spirit of Allan Block, being “Always Better”.