During the installation of the double-T beams, they must be mounted according to the pre-placed line positions. Check if the supports have been set up to the standard specifications, which include the height, placement, and strength. The double-T beams must be securely welded to the duct's structural members. The main load-bearing structure of the installed double-T beams is the duct beam.

Double T roof construction should emphasize stability and flatness.

The precision of the duct beam and the integrity of the welds determine the horizontal stability of the double T beam, thus the focus of the project quality lies in the installation of the duct beam. To ensure the masonry strength of the duct beam, the strength grade of the cement mortar used at both ends of the duct beam needs to be elevated by one level.

After hoisting is completed, add a layer of reinforced wire mesh at one end of the double-T slab, extending it 30 cm wide on the slab surface and securing it with cement nails. The reinforcing mesh extends from the bottom of the gutter to the parapet wall, 30 cm up from the roof surface. Here, secure the steel mesh with wall bricks and nails, and apply two layers of one-to-two cement mortar mixture. This prevents splitting at the connection between the double-T slab's end and the gutter wall. Both the inside and outside corners are shaped into 50 cm diameter circles.

Installation Technical Specifications for Double T Roof Panels

The double-T roof panels should be placed on concrete blocks and must be easily weldable. The four support points of the double-T roof panels must be kept level; if not, thin steel shims should be used. After placing the shims, welding can proceed. The welding requirements are as follows:

After the double-T roof panels are hoisted into place, welding is performed on two ribs of a single panel at the site. Once the construction layer of the roof is completed, welding begins at the other end. The weld thickness must be at least six millimeters. For panels with a span of less than or equal to fifteen meters, the weld length on each side should be greater than fifty millimeters. For double-T roof panels with a span less than eighteen meters, the weld thickness at both ends should not exceed eighty millimeters.

Welding requirements for the combination of double-T panels and the gable wall structure.

At the location of the gable wall, the horizontal transmission force welds should be thickened, with a thickness greater than eight millimeters and a length of at least one hundred millimeters on each side. After the double T-plates are hoisted to the designated position, welding between the plate surfaces should also be conducted, and the gaps between the plates should be sealed with a mortar mix of one part sand to two parts cement. When pouring the roof, the gaps in the plates can also be used to set up suspension molds, and the sealing and secondary pouring can be done simultaneously.

The embedded pieces under the ribs of the double-T plate must not be less than 200mm by 200mm. The steel plate should be 6 to 8mm thick, and the diameter of the rebar should be between 12mm and 14mm. The lateral force points of the roof panels cannot be placed on the gable wall; in other words, the horizontal force of the roof panels carried by the gable wall is still transmitted by the roof panels. The architectural designers have provided several design solutions for this method of force transmission.

If the crack resistance is less than or equal to seven, the M2 joints between panels should be焊接 as usual. Additionally, reinforcing strips for concentrated connections should be added. At this point, M3 does not need to be set at the end of the gable panels. When the span is greater than or equal to twenty-four meters, and the wind load exceeds eight degrees, the installation method of the structural pattern can also be used. In this case, the embedded components above the side panel supports should not be smaller than the design dimensions specified in the drawings.