Launch of the "Smart Chronos® Method," a weld-free brace joint construction method that replaces conventional seismic reinforcement.

センクシア東京支店、札幌支店、東北支店、関東支店、北陸支店、中部支店、関西支店、中四国支店、九州支店

Senkushia Co., Ltd. (Headquarters: Minato-ku, Tokyo, Representative Executive Officer: Nobutaka Kasahara), which manufactures and sells building materials and related construction, has begun selling the "Smart Chronos Method," a brace joint method that replaces traditional welded seismic reinforcement with a no-welding, short-construction-time approach. In seismic reinforcement work for steel-framed buildings, it is common to use welding methods when attaching reinforcement materials to the structure. However, welding methods require significant time and effort for work and fire prevention measures, and they pose a fire risk during construction. Therefore, there is a demand for safe, reliable, and simple joining methods that do not use fire. In response to these challenges, our company has developed the "Smart Attach Method" (brace reinforcement) with the concepts of "no welding" and "improved construction efficiency," which has been well received in seismic reinforcement for factories and warehouses. We have now applied this technology to develop the "Smart Chronos Method," which allows for the installation of brace materials using dedicated SC hardware and bolts.

Smart Chronos Construction Method Image 1

Smart Chronos Construction Method Image 2

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Related product information

Steel frame seismic reinforcement method "Smart Fit Method"
The concept is "minimizing the impact on productivity." Through refinement, it has become possible to perform non-welding work on existing structures when they are H-beams.

The Smart Fit Method involves installing reinforcement columns and anchor bolts outside existing steel columns and connecting the columns to improve the bending resistance, shear resistance, and ductility index (F value) of the column bases. In seismic reinforcement work for steel-framed buildings, welding is the common method for attaching reinforcement members to the structure. However, welding methods require significant time and effort for work and fire protection, and they carry the risk of fire during construction, leading to a demand for safe, reliable, and simplified joining methods that do not use fire. In the previous Smart Fit Method, welding was necessary during the installation of reinforcement columns, but with this refinement, it has become possible to perform work without welding when the existing structure's columns are H-shaped. Additionally, improvements in the ductility index (F value) of the column base have been achieved.
Obtained construction technology examination certification" Non-welded brace reinforcement "Smart Attach Method
The Smart Attach method is a non-welding, short-term bracing reinforcement method that replaces traditional seismic reinforcement.

<Smart Attach Method Specifications> Target Area: Reinforcement of braces for steel frame columns and beams Existing Steel Column/Beam Shape: H-shaped cross-section material (rolled, welded assembly) Applicable Column/Beam Flange Width: 124-305 mm Applicable Column/Beam Height: 1200 mm or less Web Width to Thickness Ratio: 71 or less Brace Material Angle: 20-70 degrees <Materials Used> SA Hardware: 3 types, cast steel products (equivalent to JIS G 5102/ SCW480) SA Plate: 490 Newton class steel material High-Strength Bolts: Torus-type high-strength bolts (S10T) or high-strength hex bolts for friction joints (F10T) - Detailed examination will be conducted by our company. The quantity of SA hardware and bolt diameter will be determined based on the required load capacity at the brace connection. - This method corresponds to the connection method between H-shaped cross-section materials and brace materials in brace reinforcement methods. - The cross-section examination of brace materials (including gusset plates) and the seismic reinforcement design of buildings using braces fall within the scope of the seismic reinforcement designer's considerations. *This will not be implemented by Senkushia.