Deduction of openings in brick masonry for Arch Construction | |
The following types of deduction should be provided in arch construction :- Rectangular Openings Segmental Arch Openings Semi-circular arch opening Masonry of arch Lintel over opening Rectangular Openings :- For rectangular opening, full deduction should be provided. Deduction = Length x Height x Thickness of wall = L x H x Thickness of wall Segmental Arch Openings If there exist a segmental arch opening over the rectangular opening, deduction in masonry should be provided for both the rectangular opening & the segmental arch opening. Area of rectangular section = Length x Height = L x H Area of segmental section = 2/3L x R + R3/2L So, the total deduction should be as follow :- [L x H + 2/3L x R] x thickness of wall Semi Circular Arch Opening Area of semi-circular section = πR2/2 But the approximate area of the semi-circular section = 3/4 L x R So, the total deduction = [L x H + 3/4 L x R] x thickness of wall. Masonry Of Arch The quantity of masonry in arch is calculated in cubic metre as a individual item. The quantity of arch masonry is subtracted from the total masonry. Masonry of arch = Centre length of arch x breadth of the arch x thickness of arch So, the deduction for arch in masonry = Lm x b x t Masonry Of Arch The quantity of masonry in arch is calculated in cubic metre as a individual item. The quantity of arch masonry is subtracted from the total masonry. Masonry of arch = Centre length of arch x breadth of the arch x thickness of arch So, the deduction for arch in masonry = Lm x b x t Lintel over opening An RCC lintel is arranged over the door/window opening. The quantity of RCC in lintel is subtracted from the masonry work. A bearing of 10 to 15cm from the edge of opening is arranged to the lintel on either end of the opening. So, the length of lintel will be as follow :- Length of lintel (L) = Span of opening + 2 x bearing deduction for lintel = L x width of wall x thickness of lintel. | |
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Target State: All States Target City : All Cities Last Update : 10 June 2019 Number of Views: 40 | Item Owner : Rajib Dey Contact Email: Contact Phone: 7980106705 |
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