Construction technology of hard foam polyurethane composite board

The construction process of hard foam polyurethane composite board mainly includes base layer treatment, measurement and layout, material preparation, installation of keels (with keel system), pasting composite boards, anchoring and fixing, plate joint treatment, decorative layer construction and other steps. The following is a detailed introduction:

Preparation before construction

Weather conditions: Pay attention to weather forecasts, avoid construction in severe weather such as strong winds, rains and snowstorms, and ensure construction safety and project quality.

Personnel and materials: Ensure that the construction staff is complete and prepare all the boards, spare parts and other materials required for construction, such as bonded mortar, anchors, sealants, alkali-resistant glass silk fiber grid cloth, etc.

Construction tools: Prepare special equipment and equipment such as micro-polyurethane hard foaming pouring machines, air compressors, hanging baskets or scaffolding, and conduct on-site operation inspections. Only after passing the qualification can it be put into use.

Grassroots processing:

After the exterior walls of newly built buildings have passed the concealed project acceptance, they may not be leveled, but the masonry should be grouted.

For concrete walls and masonry walls, the base surface should be cleaned, surface dust, debris, oil stains, etc. should be removed and repaired, hollow, delaminated, and expanded mold bases, so that the base surface meets the flatness requirements specified in the specifications, and its moisture content should be less than 15%.

When renovating existing buildings, similar treatments are required to be made on the base surface.

Measurement and release line

According to the building facade design and exterior wall insulation technical requirements, lines and hanging lines are sprung on the wall to determine the positioning lines and grid lines. For high-rise buildings, dry-hanging polyurethane hard bubble insulation decorative composite panels can adopt hanging basket type or wall-mounted integrated lifting scaffolding. The net distance of the scaffolding to the wall decorative panel surface should be 200-300mm, not exceeding 500mm, and should meet the construction requirements of dry-hanging (and gap pouring) and comply with the current national safety technical regulations.

Level the exterior walls of the entire building, hang control lines at the shade corners, the sun corners, and doors and windows, and adjust the three-dimensional adjustable characteristics of keels and metal combination pendants to achieve the acceptance requirements of vertical and flat walls.

Install keel (with keel system)

Main keel installation: The main keel is installed on the structural wall. It is generally installed from top to bottom. The hanging line method is used to ensure that the facade of the keel is flat, and the control line ensures that the facade flatness deviation of the keel does not exceed 5mm.

Installation of secondary keels and hanging hanging parts: Install secondary keels and hanging hanging parts on the main keels.

Keel acceptance: Concealed project inspection and acceptance should be carried out after the keel is installed and fixed.

Paste the composite board

Configure bonding mortar: Configure bonding mortar according to the requirements of the product manual.

Paste method:

The adhesion method of combining horizontal staggered frame points should be greater than a certain proportion of the panel surface (such as 40% or 60%, depending on the design requirements).

For keel systems, the polyurethane hard bubble composite board is fixed to the keel with hanging hanging parts; for keelless systems, the polyurethane hard bubble insulation decorative composite board is directly anchored to the wall with expansion tube screws. The diameter and medium distance of the expansion tube bolts are determined according to the size of the plate and the wind load. Generally, the diameter of the expansion tube bolts is not less than 6mm, the spacing is between 500 and 600mm, and the depth of entering the wall should be 50mm.

Leveling and positioning: Adjust and position the composite panel at any time, hang the board on the wall through galvanized metal combination hanging parts (pulling rivets), and form a fixed degree of ultimate unchangeable position with the hanging parts. The horizontal seams between the plates are connected by the mouth, and the installation size of the polyurethane hard bubble insulation composite board is straightened. The deviation of the position of the polyurethane hard bubble insulation decorative composite board shall not be greater than 1.5mm.

Anchor fixation

Installing anchors: After 12 hours of pasting (the specific time is determined based on the solidification time of the bonded mortar), the bonded mortar starts to install anchors, 6-8 pieces per square meter, and are installed in the shape of plum blossom spots. For keel-free systems, adjust the depth of the expansion tube bolts entering the wall to make the composite panel installed smoothly.

Anchor requirements: The specifications, location, quantity, anchoring depth and pulling force of the anchor must meet the design requirements.

Board seam treatment

Fill the plate seam: After the entire wall is pasted, fill the plate seam with polystyrene rods or other suitable materials, and generally 0.8-1cm is reserved for the plate seam.

Sealing glue:

Before inserting glue, the joints of the board must be cleaned and there must be no dirt and dust. Depending on the depth and width of the glue-sizing seam, polyethylene foam round rods can be used at the bottom of the seam (generally, the diameter of the rod should be greater than 1.3 times the width of the seam). To view the depth of the seam, if necessary, you can use a single-component foam glue and polyethylene foam round rod to seal the middle layer of the seam.

According to the size of the gap, cut the nozzle of the sealing rubber cylinder and squeeze the sealing rubber evenly near the bottom of the gap. Control the balance between the movement speed of the discharge nozzle and the discharge volume, so that the corners of the gap are filled, and there must be no glue breakage or hollowing. The sealant surface should be trimmed in time after caulking. The thickness of the infused sealant should be uniform and dense, full, with clear edges, straight horizontally and vertically, tightly sealed, and must not be higher than the plate surface.

Finishing layer construction

Crack-resistant mortar construction:

Make crack-resistant mortar, cover the anchor parts to level, lay the alkali-resistant glass wire fiber grid cloth longitudinally, turn the window part and wrap it, and strip auxiliary overlap at the window overlap at least 20cm.

Make a second crack-resistant mortar, cover the grid cloth and continuously level it, and the thickness of the crack-resistant mortar is required to not exceed 3mm.

Paint finish: When using paint as the finish, the plaster layer should be covered with putty and then finish.