13g322-2 lintel group

When there are doors and windows on the wall and the hole in the wall is more than 300mm, in order to bear all kinds of loads from the upper masonry of the hole and transfer these loads to the walls on both sides of the hole, such as doors and windows, beams are often set on the doors and windows, which are called lintels.

Generally, the diameter of steel bars is 6-8 mm, and two or three bars are sandwiched. According to the design requirements, there are two layers of bricks and one layer of steel bars, and two layers of bricks and one layer of steel bars can also be built. The top of the brick wall hole is equipped with steel bars, which are generally used for lintels such as doors, windows and equipment holes with small load and small span (the advantage is simple, convenient and fast, and there is no need to set up templates like reinforced concrete lintels).

Extended data:

Reinforced brick lintels bear bending moment and shear force. When the tensile stress in the tension zone of lintel exceeds the tensile strength of brick masonry, vertical cracks will appear in the tension zone in the middle of span; When the principal tensile stress of the inclined section at the bearing exceeds the tensile strength of brick masonry along the tooth gap, inclined cracks will appear near the bearing, which are manifested as stepped inclined cracks in masonry materials.

Horizontal thrust will appear after the beam of the flat arch and arc arch in the middle of the span cracks. This horizontal thrust is borne by the wall at the supports at both ends. When the shear strength of the mortar joint of this wall is insufficient, it will lead to the sliding failure of the bearing, which is more likely to happen at the wall at the end of the house.