Roof Truss - Design 1 - 24' span, 2-web, with plywood gussets (Figure 1) Figure 1 - Roof truss - 24' span, 2-web, with plywood gussets Detailed information for a 2-web roof truss with a 24' span with plywood gussets. As well, running an attic air duct system can be very difficult, if the roof trusses were not designed for that application. Software suite TRUSS4 is designed for analysis of timber truss structures connected with punched metal plate fasteners. The primary disadvantage of roof trusses is that the attic space is not easily usable for storage or potential living space. Design and optimize trusses with iDesign, the industry’s leading engineering engine.

Secondly, roof trusses can span very large distances without the need for any center support. The first is that they are factory built making them far less labor intensive than forming and installing a roof support system on site. In the integrated manufacturing process, by controlling the main chord web plate hole group extreme edge hole distance tolerance and controlling the machining precision of the auxiliary joist rod and a connector plate, rod drilling precision is guaranteed, and on-site erection efficiency is improved.There are two primary advantages of roof trusses. Submerged-arc welding of the top plate and the web plate of a main chord under the circumstance of insufficient operation space is achieved, welding efficiency is improved, and welding quality is guaranteed.

The technology comprises the technology of erecting a ship type welding platform for achieving submerged-arc welding of a main welding joint between a high and large web plate and a top plate under the circumstance that the main welding joint is insufficient in welding operation space and large in length, the technology of controlling the main rod web plate hole group extreme edge hole distance in an integrated manufacturing process of a main rod and an edge longitudinal beam, the technology of controlling the main rod and edge longitudinal beam integrated manufacturing boundary dimension, the technology of installing an edge longitudinal beam steel anchor box, the technology of triangularly splicing upper and lower chords, a web member, the edge longitudinal beam and the steel anchor box, and the technology of controlling the matching precision of an auxiliary joist rod and a gusset plate hole group.

The invention discloses a large-span main truss and bridge deck slab integrated manufacturing and auxiliary truss drilling precision control technology.

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