Housing downpipe installation specification how to calculate the distance between the downfall of the house

Downpipes are drainpipes that are widely distributed outside buildings. The importance of it must be clear to everyone. It is different from the indoor drains. The downspouts are mainly rainwater on the roof of the building. Whether it is an indoor drainage pipe or an outdoor downpipe, downpipe installation specifications are very strict. Be very cautious when installing. Once a problem occurs in one part, the entire pipe must be re-layed. Here I will take everyone to learn downpipe installation specification !

Downpipe size

The size of the downspout pipe is divided into different specifications, for example, 40mm, 50mm, 75mm, 90mm, 110mm, 150mm, 200mm, 250mm, 315 mm, 400 mm, 500 mm, etc., which are commonly used for the round pipe. The installation method of downspout pipe is as follows: first, set the fixing bracket according to the drawing and marking the position of the downspout at an interval of 1.5--2.0 meters; secondly, after the length of the pipe is measured, use a hacksaw, a hand-cut saw and an abrasive cutting machine to cut the saw.

Downpipe spacing

Downfall diameter is divided into 75, 100, 150 several. The distance between downpipes: the parapet is less than 18m, the provocative flat roof is less than 24m, the single-floor industrial plant is less than 30m, and the tile roof is less than 15m.

Downfalling material

1, metal pipe (such as cast iron pipe, color aluminum pipe, copper pipe, etc.);

2, plastic pipe (such as PVC pipe, etc.);

Downpipe use

Collect rainwater from the roof and concentrate it into the rainwater pipe laid below the ground.

Downfall brand

Downfall common brands: Kohler, Imperial Steel, submarines, Green Sun, Moen, Long Jiang, Hansgrohe and so on.

  

Downpipe calculation

The layout of the roof downpipes is related to the size of the roof catchment area, the maximum amount of rainfall per hour, and the diameter of the drain pipe. Available formula: F=438D2/H

Formula: F - Percentage of allowable catchment area for single downpipe (horizontal projection area, m2)

D—Drain pipe diameter (cm, area can be converted using square pipe)

H—Maximum rainfall per hour (mm/h, provided by the local meteorological department)

In engineering practice, the distance between downspouts (distance in the gutter) is preferably 10-15m. When the calculated spacing is greater than the applicable spacing, set the downpipe to the applicable distance; when the calculated spacing is less than the applicable spacing, set the downpipe to the calculated spacing.

The stormwater outlet should be set according to the different drainage modes of the maximum catchment area that a riser can bear, and the amount of water discharged from the adjacent building to the roof should be taken into account; the location of the roof gutter or downpipe should be consistent with other plans.

Rainwater riser assumes maximum catchment area area table

Rainwater pipe inner diameter 100mm150mm200mm Outer clearwater pipe 150m2400m2800m2 Inner drain pipe 120m2300m2600m2 Inner drain pipe 100m2200m2400m2

Roofing area calculation rules

a. Roof surface area should be calculated according to the horizontal projected area of ​​the roof b. Calculation of the area of ​​the catchment above the side wall of the roof

(1). A side wall is converted into a catchment area by 50% of the side wall area

(2). The square root of the sum of the square sums of the two sides of the side walls on both sides of the side wall, √a2+b2, is converted into a sink area.

(3). Comparing the two sides of the contour side wall does not account for the catchment area

(4). Comparing the two sides with different heights, the sidewalls are converted into the catchment area by 50% of the area of ​​the wall above the bottom wall.

(5). 30% of the wall area of ​​the three sides of the side wall below the bottom of the lowest bottom wall plus (2), (4) the minimum wall area above the top of the wall in both cases

(6). The wall surface below the lowest wall of the four sides of the side wall shall not be counted. Only the areas above the top of the wall (1), (2), (4) and (5) shall be calculated.

Downpipe prices

Due to different brands, models and manufacturers of downspouts, prices of downpipes will vary. Downpipe prices range from tens to hundreds of dollars.

Note: This price is for reference only! Due to geographical differences, of course, the price will be different. For more details on the prices, please refer to the local distributors!

  

Downpipe installation specification

The distance between downspout pipes: flat roof of the parapet <18m, provocative flat roof <24m, single-floor industrial building <30m, tile roof <15m.

Downpipe installation height and ground distance: Generally from the height of the roof panel to the outdoor floor minus 150mm.

The distance from the falling wall to the wall surface is not clearly defined, but it must be determined according to the requirements of the construction technology. After the installation, the operation of the next process cannot be hindered.

Circular tube installation: Common specifications for round tubes are 40mm, 50mm, 75mm, 90mm, 110mm, 150mm, 200mm, 250mm, 315mm, 400mm, 500mm and so on.

1, according to the drawings marked downpipe position interval 1.5--2.0 meters set fixed bracket;

2. After the length of the pipe is measured, a hacksaw, a hand-cut saw and an abrasive cutting machine may be used to cut the saw. After sawing, the section should be kept flat, with steel burrs removed and chamfered;

3. Use a dry cloth with detergent to clean the outer wall of the pipe and the inner wall of the pipe to remove contaminants;

4. Dissolve the dissolving agent evenly on the outer wall of the pipe and the inner wall of the pipe, then quickly insert the pipe into the pipe, and rotate the pipe at least 1/4 turn to ensure that the joint is tight without leakage;

5, wipe off the excess solvent after bonding, the pipe fixed in position for a period of time, 60min can not be affected by external forces;

6. After the tube is completely bonded, place the bracket in the set bracket and tighten the bracket fixture.

Square tube installation: square tube commonly used specifications are 80mm*55mm, 80mm*63mm, 80mm*100mm and so on.

1. After measuring the length of the pipe, use a hand-cut saw and a sawing machine to cut the saw. After sawing, the section should remain flat;

2. Insert the pipe into the pipe and fix it with rivets. Apply the seam on the silicone to ensure that the joint is tight and seamless.

3. Place the pipe in the position indicated on the drawing and fix it with pipe fittings, stainless steel screws and expansion pipes.

Editor's summary: The above is the introduction of house downpipe installation specifications how to calculate the roof downpipe related knowledge, the installer must do a good job in the preparatory work before the start of the project, the necessary tools for installation are complete, the installation location should also be measured in advance to avoid errors Impact on the entire project. The installation process should also pay attention to its own safety, and after installation to check the firmness and tightness of the pipe connection point, to ensure that nothing is lost!

Home Renovation Designer Construction Installation Housing Home Renovation Budget List House Renovation Notice Downpipe Installation Specification

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