How to calculate the quantity of plastic pipe sleeve

1. Structure (gravel) cushion, paving concrete base, asphalt surface, before reading any drawings, first understand the engineering structure to understand the drawings
it is suggested that you first learn about roads and understand the road structure
road structure is generally divided into: foundation treatment, subgrade filling, and then ancillary structure (shoulder stone)

2. Rebar belongs to reinforced concrete steel in building materials, and its size, shape, weight and allowable deviation are specified in the national standard. The current national standard is (GB_ According to GB 1499.2-2007 steel for reinforced concrete Part 2: hot rolled ribbed bars, the theoretical weight of rebar with nominal diameter of 16mm is 1.58kg/m. That is to say, the standard Ф 16 rebar should weigh 1.58 kg per meter.

3. Weight = (outer diameter wall thickness) * wall thickness * 3.14 * 7.85 * length / 1000

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4. If the calculation is made, the density of the pipe of this material must be checked on the Internet, and then the total volume of the pipe minus the volume of the middle hollow is equal to the volume of the pipe wall. Then multiply the volume of the wall by the density to get its mass

5. According to the design drawing, 03g101-1, steel bar feeding specifications and other data
different specifications are calculated according to each. The design drawings generally indicate what steel bars are connected by sleeves.

6. Solution: first calculate the PE volume of one meter long pipe, which is actually the volume difference of two cylinders
inner diameter 225mm, then the inner radius is 112.5mm = 11.25cm, The bottom area is about 3.14159 * 11.25 * 11.25 = 397.607484375 (square centimeter)
so the volume of inner cylinder is 397.607484375 * 100 = 39760.7484375 (cubic centimeter)
the volume of outer cylinder is about 3.14159 * (11.25 + 1.28) ^ 2 * 100 = 49323.2457431 (cubic centimeter)
so the volume of PE is 49323.245744431-39760.7484375 = 9562.4973056 (cubic centimeter)
weight About: 9562.4973056 * 0.92/1000 = 8.797497521152 (kg) ≈ 8.8kg

for reference! I repeated the calculation, can not work out the results of the above two friends.

7. When calculating the main reinforcement of beam and column, the number of laps is the number of sleeves.

8. According to the latest national standard, the reinforcement sleeve shall be calculated when the diameter of reinforcement is more than 22 (including), whether it is longitudinal or transverse reinforcement. The number of casings depends on the length of the fixed length. In most areas, they are overlapped by 9m, but in some areas, they are different. For example, in Fujian, they are overlapped by 8m
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9. The steel bars at both ends of the positive wire sleeve can rotate freely, and the connection requirements can be achieved by screwing the steel bars with a wrench ring construction. When the reinforcement at both ends of the sleeve can not be rotated at will, it needs to be connected with positive and negative wire sleeves, and the reinforcement at both ends can be connected by screwing the sleeve with a wrench
in site construction, the steel bars in slab, beam and column are straight rods, which can be rotated at will, and the normal wire sleeve is generally used; At the plate end, beam end and column end, one end of the steel bar is equipped with crutches, and the direction of the crutches is required, which can not be rotated arbitrarily, so it is necessary to use positive and negative wire sleeves
if we calculate the quantity, we can't calculate it accurately. The same building, looking for different people for steel proofing, will also get different number of sleeves. If it is an estimation, you can calculate the amount of reinforcement of a certain specification in beam slab and wall column, divide the amount of reinforcement in beam slab by span to get the number of joints of horizontal reinforcement, divide the amount of reinforcement in wall column by storey height to get the number of joints of vertical reinforcement, and then enlarge it appropriately. As for the recing sleeve, let them write it on the cover of the material list after they make the material list. Learn Guanglianda, this software seems to be more accurate calculation.