The failure form of reinforced concrete lintel is similar to that of flexural members.
(5) There shall be no bricks less than 1 / 3 of the block length on the masonry brick wall.
At the T-junction of the block wall, the skin of the cross wall block shall be exposed.
(9) For the connection between the block and the door, one piece of precast concrete block or clay brick embedded with wood brick or iron piece shall be built after each two pieces of brick.
(4) For multi-storey masonry buildings with cast-in-situ floor (roof), when the number of floors exceeds 5, when the cast-in-situ reinforced concrete ring beam is set in the interlayer according to relevant standards, the beam slab and ring beam shall be poured together.
A 2 ΓΈ 6 reinforcement shall be set every 500mm high, and the extension into the horizontal mortar joint of the block wall shall not be less than 700mm.
(6) The mortar joint shall be horizontal and vertical, and the mortar shall be full.
After the concrete hardens, pull out the strip, repair the edge of the concrete, and then pour asphalt cement.
The waterproof layer shall not be less than 50mm stuck into the water drop cup.
(4) In case of through wall pipeline, its position and size shall be verified in advance.
(2) At the bottom of the block wall, lay clay brick or porous brick wall with a height of not less than 200mm or cast-in-place concrete foundation belt.
When the wall thickness is not less than 240mm, its width should not be less than 2 / 3 of the wall thickness.
(8) At the junction between the block wall and the bearing wall or column, tie bars shall be embedded in the bearing wall or column.
An important requirement for the apron surface is that it should have an outward slope, and the farthest distance from the wall should be at least 20mm higher than the outdoor floor.
If the thickness of the mortar joint of the lowest layer is greater than 20mm, it shall be paved with fine aggregate concrete, and the full paving and squeezing method shall be adopted.
When the ring beam is cut off by the door and window opening, an additional ring beam with the same section shall be added at the upper part of the opening.
(7) Most concrete apron expansion joints and settlement joints use 15 ~ 20mm wide wooden strips as dividing strips.
(3) Thickness: not less than 60mm.
Although these parts are small, they are of great significance.
The lower part shall be anchored in the top ring beam, and the upper part shall be connected with the top ring beam.
(2) For the door and window lintels in the infilled wall, when the distance between the portal wall or structural column is less than 250mm, the lintel reinforcement must be embedded in the wall or structural column.
(4) Expansion joints shall be set every 12m.
It is mainly reserved to reduce subsequent chiseling and damage to the wall.
Whether the local compression at the supports at both ends meets the requirements shall be fully considered in the checking calculation.
Let’s have a look.
The parapet (1) is provided with longitudinal tie bars in the parapet masonry, with a full length, two of which pass through the structural columns.
(2) The slope within 500mm around the water outlet shall not be less than 5%, and shall be sealed with waterproof coating or sealing material, and its thickness shall not be less than 2mm.
The lap length of additional ring beam and ring beam shall not be less than 2 times of the vertical spacing, and shall not be less than 1m.
(3) Two days before masonry, the joint between the aerated concrete block and the original structure shall be watered to ensure good bonding of the masonry.
The upper and lower layers shall be staggered, and the corners shall be overlapped with each other.
When the thickness of masonry outside the column is not more than 120mm, transverse tie bars may not be set.
(3) During installation, ensure that the elevation and position are accurate, the ash setting is full, and the length of support points at both ends is the same, so as to enhance the stability.
In addition to the main structure, there are many structures in the building structure, such as structural column, ring beam, lintel, etc.
(8) When the apron expansion joint is poured with asphalt binder, shielding measures must be taken to avoid polluting the wall at the corner of the building and the surface of the apron.
Water outlet (1) the elevation of the upper opening of the water outlet cup shall be set at the lowest part of the ditch bottom.
Generally, the wooden strips are required to be scraped and polished with dry materials of red and white pine.
The form of cast-in-situ lintel shall be adopted, which shall be uniformly set according to the lower reinforcement and anchored according to the requirements of the beam.
If there are problems, they will cause hidden dangers of engineering safety.
(3) The width of reinforced concrete ring beam should be the same as the wall thickness.
For the bricklaying of the secondary structure of the infilled wall (1), the + 500mm elevation horizontal line, the vertical side line of the aerated concrete wall and the door position line must be snapped on the structural wall and column.
Generally, three pieces shall be built on each side within 2m of the opening height; When the height of the opening is greater than 2m, 4 blocks shall be built on each side.
(2) The structural column shall be designed with reasonable section spacing, and its vertical reinforcement shall be determined according to the seismic calculation.
(3) Transverse connecting reinforcement shall also be set outside the parapet masonry, one brick shall be pressed every four layers, the open end shall be anchored in the structural column, and its two straight legs shall be lengthened with the slope.
(4) Length: except for steps and slopes, a gap shall be set every 6 ~ 12M, with a width of 20mm, and the joint shall be filled with asphalt (mastic).
(3) A groove with a width of 20mm and a depth of 20mm shall be reserved at the contact between the water drop cup and the base course, and the sealing material shall be embedded..
Ring beam (1) the ring beam should be continuously set on the same horizontal plane and form a closed shape along the direction of vertical and horizontal walls.
The thickness of horizontal mortar joint of autoclaved aerated concrete block shall not be greater than 15mm, and the vertical mortar joint shall be filled after being clamped with internal and external temporary splints, and its width shall not be greater than 20mm; The mortar joint of hollow brick and lightweight aggregate concrete small hollow block shall be 8 ~ 12mm.
When the roof adopts unorganized drainage, it is 200mm wider than the cornice.
Here are some detailed structural construction points for attention in the project construction.
(2) Slope: 3% ~ 5%.
(7) Reinforcement shall be placed on the upper part of the wall opening, and the length extending through each side of the opening shall not be less than 500mm.
Apron (1) width: not less than 600mm.
Lintel (1) due to the joint action of bending moment and shear force on the lintel, vertical cracks will be caused when the tensile stress in the tensile area exceeds the tensile strength of brick masonry.
The spacing of structural columns shall not exceed 4m.
(5) If the annual rainfall does not exceed 900mm, apron shall be set, and open ditch shall be set if it exceeds 900mm.
(6) For buildings with unorganized roof drainage and cornices, the apron shall be 150 ~ 200mm wider than the cornice plate.
(2) The ring beam shall be reliably connected at the junction of vertical and horizontal walls, especially at the corner of the house and the T-intersection.
