Secondary joist profile grid systems

A joist beam for formwork construction, the joist beam having a joist profile including:

• a vertical support;
• a lower horizontal support connected to a bottom of the vertical support;
• two leg supports at opposite ends of the lower horizontal support, each of the two leg supports connected to the lower horizontal support and extending in an opposite direction from the lower horizontal support relative to the vertical support;
• a first leg support, of the two leg supports, at a first end of the lower horizontal support;
• a second leg support, of the two leg supports, at a second end of the lower horizontal support;
• a first foot portion connected, via a first foot-leg connection, to the first leg support, the first foot portion including a first upper foot portion on an outward side of the first leg support and a first heel portion on an inner side of the first leg support;
• a second foot portion connected, via a second foot-leg connection, to the second leg support, the second foot portion including a second upper foot portion on the outward side of the second leg support and a second heel portion on the inner side of the second leg support,
• wherein each of the first and second foot-leg connections has a respective one of the first and second upper foot portions meeting a respective leg support at a point higher than each respective heel portion.

A method of constructing a joist beam for use as a formwork component, the method comprising:

• obtaining two endcaps for the joist beam;
• obtaining a middle joist component, formed from an aluminum alloy material, for the joist beam;
• and
• welding a first of the two endcaps to a first end of the middle joist component;
• and
• welding a second of the two endcaps to a second end, opposite the first end, of the middle joist component,
• wherein the middle joist component is longer than six feet and has a joist profile that includes:
• a vertical support;
• an upper horizontal support portion connected to a top of the vertical support;
• two arm supports at opposite ends of the upper horizontal support, each of the two arm supports connected to the upper horizontal support and extending in an opposite direction from the upper horizontal support relative to the vertical support;
• a first arm support of the two arm supports, at a first end of the upper horizontal support;
• a second arm support of the two arm supports, at a second end of the upper horizontal support.

A formwork grid system constructed from a plurality of formwork components, the formwork grid system comprising:

• a joist run of at least 94 feet, the joist run including a maximum of thirteen (13) props and twelve (12) joist beams, wherein at least one of the joist beams is made of an aluminum alloy and utilizes a joist profile that includes:
• a vertical support;
• an upper horizontal support connected to a top of the vertical support;
• two arm supports at opposite ends of the upper horizontal support, each of the two arm supports connected to the upper horizontal support and extending in an opposite direction from the upper horizontal support relative to the vertical support;
• a first arm support of the two arm supports, at a first end of the upper horizontal support;
• a second arm support of the two arm supports, at a second end of the upper horizontal support.