Construction method and characteristics of sandwich insulation wall

Sandwich insulation wall is a kind of composite wall formed by sandwiching insulation materials between two layers of walls (inner leaf wall and outer leaf wall). The inner and outer leaf walls are generally reinforced concrete structures, the insulation boards are generally made of B 1 grade organic materials or B2, and the tensile connectors are generally made of composite materials or stainless steel. Sandwich insulation wallboard is widely used in precast wall or cast-in-place wall, but it is more convenient to use sandwich insulation wall technology for precast concrete exterior wall.

Construction method of sandwich insulation wall: 1. Basic plastering shall meet the requirements of advanced plastering, and the surface shall be smooth, dense and polished without brush lines and scratches; Plastering should be smooth, without hollowing, holes, cracks, crisp powder, pulverization and other unqualified phenomena. Verticality and strength meet the construction acceptance standards.

Second, the surface is free of dirt, floating dust and oil stain.

Third, the frame joints are consistent in depth, horizontal and vertical, and there is no shortage of edges and corners; Drip line is smooth, straight and firm without obvious surface defects; The flashing slope should meet the design requirements, and the angle of Yin and Yang at the base surface should be straight and square.

Four, the internal and external walls of the structure, embedded parts, plumbing, electrical appliances and other pipelines should be installed and positioned as soon as possible according to the design requirements. Cement mortar should be leveled in advance at the convergent position of each part to make it have enough drying time, and exposed steel bars should also be derusted and rustproof.

The advantages of sandwich insulation wall are as follows: first, it isolates the external environment temperature from the indoor temperature, which greatly reduces the indoor temperature change. Really played a role in energy conservation and environmental protection.

Second, the requirements for thermal insulation materials are not high, and most materials are available.

Third, it has a certain sound insulation effect.

Disadvantages of sandwich insulation wall: 1. The seismic capacity is poor, and the thermal insulation material in the middle has no seismic capacity.

Second, compared with the traditional wall, it is thicker, more complicated in construction, requires connectors, and has higher requirements for workers.

The sandwich insulation wall composed of three layers or three layers is easy to form a "thermal bridge". The external wall is easily affected by outdoor temperature, and the temperature difference between day and night is too large, and the temperature difference between winter and summer is too large, which leads to cracking, rainwater infiltration and long hair.

Sandwich insulation wall is usually used in the cold north.