When considering the best options for your building project, the benefits of going with a concrete wall panel system are many. By choosing a concrete wall panel system, these features may provide advantages that can be enjoyed by owners, architects, engineers and contractors on site. The benefits include:
- Energy efficiency
- Environmental reliability
- Aesthetically attractive
- Minimal preservation
- Speediness of construction
- Onsite Productivity
To enjoy the benefits, we must make sure the connection between the precast elements and of the precast walls to foundation is robust enough to ensure the safety and integrity of the structure. Here are 4 main ways to connect precast wall panels to foundation.
Casting Corrugated Duct into the precast element is the traditional method to connect precast walls to foundation. Corrugated duct is used as a hole former for a variety of precast and cast-in-situ concrete works. The hot dipped galvanized metal duct is strong and durable for casting into precast walls and then to be connected with rebars from the foundation.
Although duct has been a commonly used method for precast connections, one of the major disadvantages of duct application is the huge amount of grout needed to fill up the duct in order to secure the connection between the precast wall and foundation.
Eventually, this traditional method will increase the cost and time of the overall construction.
Specifically for precast connections, Grout Coupler can be used for connecting precast walls, columns, beams either horizontally or vertically. The most popular connections used with Grout Coupler are:
- Precast concrete column to foundation connection
- Precast column to column connection
- Precast beam to column connection
- Precast wall to foundation connection
- Precast wall to wall connection
The rebars protruding from the foundation are simply inserted into the grout coupler, which has been casted in the precast wall. When pumped with Moment’s proprietary 100MPa grout, the grout coupler system is a bar break technology and is capable of carrying very high bar loads regardless of the rib profile on the reinforcing bar.
Although this is not the most popular application of grout coupler but the application of grout coupler for precast wall to foundation is still widely accepted in the market.
Mainly used for connecting precast column and foundation, Precast Shoe can also be used to connect precast wall panel to foundation. They are especially suitable for anchoring in flat structures such as the foundations or walls that have sufficiently large edge distance.
The advantage of this precast system with screw connection is the quick assembly. The connection is easy to adjust with a healthy tolerance and immediately loadable so that bracing is not required which results in less labour at site. However, they are not specifically designed for walls and therefore have a limitation on the wall thickness and thin walls cannot be connected using this type of product.
The system comprises of the precast shoe (cast into the precast wall) and the suitable anchor bolts (cast into the foundation) for the foundation base. Both elements are joined by load bearing nuts during assembly on site.
The Most Cost Efficient Way To Connect Precast Wall To Foundation : Wall Shoe
Specifically designed for precast wall to foundation connection, the Wall Shoe system provides a bolted type connection, also described as ‘dry joint’ or ‘mechanical connection’. This product can be used for connecting precast wall or elements, either horizontally or vertically including thin wall application down to as little as just 100mm thick.
The system consists of Wall Shoe casted into a wall section and Anchor Bolt on the foundation. When they come together, there is a generous tolerance to ensure that the relative accuracies of in-situ and precast concrete can be easily accommodated. The assembly can then be simply secured using a locking plate and high strength nut.
Compared to the 3 methods above, wall shoe has the most cost efficient design as it requires the least grout to secure the connection on the foundation, which leads to enormous time gain.