When installing stormwater / household / industrial sewage mains, the use of polymer wells for sewage is common. Such tanks differ in technical characteristics from the usual reinforced concrete structures, in most cases for the better.
Advantages and disadvantages of plastic sewer wells
Experts highlight the following positive aspects of polymer tanks:
- Smoothness of the inner walls of the wells, due to which it is possible to prevent siltation of the system, settling of sand and earth on its walls.
- Accuracy of geometric connections (pipes, covers, bottom). Prevents the possibility of effluent leaks into the ground. All joints are reinforced with factory rubberized gaskets, so an environmental disaster on the site is excluded.
- The strength of the polymer. Structures withstand soil pressure / heaving, static and dynamic loads due to the corrugated body of the product. The corrugation rings act as stiffeners.
- Possibility of finishing the tanks in height using separate screw-on elements.
- Light weight of products, which facilitates their transportation and subsequent installation. One meter-high unit weighs up to 50 kg.
- Low thermal conductivity.
- Resistant to temperature extremes.
- Inertness to aggressive environments.
- Availability. The average price of one well is about 5-7 thousand rubles.
The disadvantages of polymer products include the need to use a sealant when connecting them to the system pipes. At the same time, auxiliary components ensure greater reliability of the storm drain. In addition, despite the strength of the tanks, their installation must be carried out in accordance with the instructions. Otherwise, there is a risk of damage to the integrity of the mine.
Materials used
Tanks are made of three types of polymers:
- PVC. Marked as PVC. Polyvinyl chloride is considered the most durable and resistant to aggressive environments. Such wells are used for sewerage devices in industrial enterprises. Resistant to combustion.
- PE. Marked as PE. The use of polyethylene sewer wells is common on moving soils and at low temperatures. Resistant to repeated freezing / thawing without loss of plastic properties.
- Polypropylene (PP). Flexible and wear-resistant material that becomes brittle when frozen. However, if we take a polymer sand receiver, in which fine sand plays the role of reinforcement, the tank will become many times stronger even under subzero temperatures.
Sizes of plastic wells for sewerage: diameter varies in the range of 3000-1000 mm; height - within 1-1.5 m; tank wall thickness - from 10 mm.
Scope of application
Plastic wells can be used as independent reservoirs for the network device and as sealed inserts in concrete shafts. In this case, the tightness of the receivers increases, and the soil pressure on them does not have such a negative effect.
The main purpose of polymer wells is to connect the branches of one main line in order to ensure the smooth operation of the system. In general, polymer tanks perform several functions at once:
- work as points of change of direction of the pipeline;
- provide reliable monitoring of the work of all communication;
- allow you to lay pipes at different levels relative to the horizontal, subject to complex relief;
- help to change the speed of the transported stream;
- provide access to sewerage sections for repair work.
They mainly use polymer wells for the construction of household and industrial collectors, as well as for the installation of a reliable central stormwater or drainage system on the site. Occasionally, tanks are used for cable communications in order to check their condition.
Types and arrangement of plastic wells
All polymer tanks are divided into several types according to their intended purpose. Most Popular:
- Revision (inspection). Allows you to assess the state and performance of the system. Structurally, they consist of a plastic shaft, a perforated bottom and a screw cap. If necessary, they have openings in the lower part for supplying the pipeline to them.
- Differential. Provide pipe laying at different levels. They can work as swivel to change the direction of flow. The design of such tanks is a shaft, a cover and a sealed bottom.
- Absorption (drainage). Designed to drain accumulated moisture into the ground. They do not have a bottom, but they are equipped with a polymer shaft and a cover. In this case, the bottom is made of river sand, fine crushed stone, broken slag or brick.
- Accumulative. Fully sealed tanks designed to collect water. In the future, it can be used for economic or technical purposes. Typically, the storage receiver is installed at the lowest point in the system.
In most cases, for the installation of a highway with a total length of 30 meters or more, at least two or three different polymer tanks (absorption or storage, revision, rotary) will be required.
Installation principles
Installation of polymer receptacles is carried out in several stages. In this case, depending on the type of tank, the sequence of actions is supplemented or reduced. Stages of work:
- Preparation of the pit. The depth is 20-30 cm higher than the height of the tank. In turn, the diameter of the pit must be increased by 20 cm from the existing section of the well. This distance will later go to a powerful sprinkling.
- Preparation of the base. The actions differ depending on the type of receiver. Under the storage well, you need to compact the soil, add a 15 cm thick sand cushion and tamp it well, pour a layer of concrete mortar on top. After it has solidified, you can put the receiver. If the well is absorbing, first a reservoir is installed, then a layer of river sand is poured, on top of fine crushed stone and broken brick.
- Connecting pipes. Before installing the receiver in the pit, holes are formed in it for the input of the line. The pipes are connected, the joints are sealed with a rubber gasket. Additionally, you can use a sealant. They treat the sealing cuff around the entire perimeter.
- Backfilling of the well. To prevent the compacted soil from deforming the tank around the perimeter, it must first be filled with water. After that, earth is poured around the well and carefully rammed in layers.
The last stage of assembling the wells is the installation of the manhole cover. It can be freely assembled into technical slots.
If tanks are installed on a public highway, it is advisable to provide a locking mechanism for the well cover.
Prices for polymer tanks for sewage
Prices for plastic sewerage wells vary slightly depending on models, dimensions, material. The approximate cost of tanks in Moscow:
- distribution well - from 6 to 14 thousand rubles (depending on the size);
- viewing room - from 3.5 to 15 thousand rubles;
- prefabricated receivers consisting of separate (refined) elements - from 8 to 12 thousand rubles.
You can purchase separate components for the system.A screw-on ring to increase the height of the tank, a manhole cover or a gouged bottom will cost in the range of 2.5-5 thousand rubles.
