Structural module with vertical ties
A vertical tie is for a load-bearing column of a building off-site structural module with a box-section structural member. The tie has a top tie assembly for engagement by a torqueing tool from above the column. There is a bottom tie assembly, which fastens to the module below. Torque which is applied to the top tie assembly is transferred to the bottom tie assembly by an interconnect tube. The top and bottom tie assemblies are configured so that the bottom tie assembly is adapted to engage with a top tie assembly of an underneath module, in one case by a nut engaging a spindle protruding up from the lower module. This allows modules to be tied together in the vertical direction in a simple, convenient, and safe manner by an operator on-site working on top of the upper module. Access to torque the tie does not require any side opening in the column and so its load-bearing properties are not affected.
1. A building structural module comprising:
structural members including a plurality of load-bearing structural columns, each said column comprising a vertical structural member, a top capping plate at a top end of the vertical structural member, and a bottom capping plate at a bottom end of the vertical structural member, and a vertical tie, in which each said vertical tie comprises:
a top tie assembly,
a bottom tie assembly, and
an interconnect member interconnecting said top and bottom assemblies,
wherein:
the vertical tie is configured to fit within the load-bearing column,
the top tie assembly comprises a tool interface configured to engage a tool for application of torque,
said bottom tie assembly is configured to engage an underneath module structural column by application of torque to said tool interface and transfer of said torque by the interconnect member,
said top and bottom tie assemblies are configured so that the bottom tie assembly engages with a top tie assembly of the underneath module structural column,
the top tie assembly comprises a fastener which is engageable after operation of the tool, to protrude above the load-bearing structural column, the fastener comprising a bolt or spindle engaging a receiver of the top tie assembly, and said receiver is axially-aligned with the tool interface and is configured to allow the tool to pass through the receiver while engaging the tool interface, whereby the fastener is configured to be engaged with the receiver after removal of the tool,
the top tie assembly comprises the top capping plate and the receiver is connected to the top capping plate,
the bottom tie assembly comprises the bottom capping plate, and said bottom capping plate comprises a through-hole configured to receive said spindle, and
the top tie assembly comprises a housing containing said axially-aligned receiver and said tool interface.
2. The structural module as claimed in claim 1 , wherein said columns are at each corner of the module, forming corner posts.
3. The structural module as claimed in claim 1 , wherein at least one column has a tubular configuration, and each said vertical tie is within said column.
4. The structural module as claimed in claim 1 , wherein each said tool interface is a socket having an internal shape.
5. The structural module as claimed in claim 1 , wherein each said bottom tie assembly comprises a nut for engaging a bolt or spindle of a lower module frame.
6. The structural module as claimed in claim 1 , wherein each interconnect member is tubular.
7. The structural module as claimed in claim 1 , wherein each said interconnect member has a circular cross-sectional shape.
8. The structural module as claimed in claim 1 , wherein each said bottom tie assembly comprises a housing surrounding axially-aligned fastener parts.
9. The structural module as claimed in claim 1 , wherein the tie is positioned within the vertical structural member of the load-bearing column.
10. The structural module as claimed in claim 1 , wherein the vertical structural member has a box-section configuration.
11. The structural module as claimed in claim 1 , wherein the tie is affixed to one or both of said top and bottom capping plates.
12. A method of fastening the building structural module of claim 1 , including an upper structural module and a lower structural module, the method comprising:
connecting a respective said fastener to the top tie assembly of each load-bearing column of the lower module;
placing the upper module atop the lower module with each fastener inserted in a corresponding bottom tie assembly of the upper module; and
using access from above the upper module using the tool, engaging each top tie assembly of the upper module to tighten each bottom tie assembly of the upper module to each said fastener.