One of the main elements of a modern drainage system is a sewer well. We often meet hatches of these structures, even if we just walk along the streets of the city. But also in the autonomous sewer system, which a private owner equips on his site, wells are also used.
We suggest that you familiarize yourself with the classification of wells presented by us for sewage systems. Their division into types was carried out according to the functional purpose and the material used in the manufacture. The article will help to understand the varieties and choose the appropriate option.
Our detailed information on the types and operational features of wells, which are a mandatory component of the sewage system, is supplemented by diagrams, video and photos for visual perception.
Why do we need sewer wells?
Sewerage is one of the essential attributes of civilized life. And it doesn’t matter if it is about the life of a large industrial city or an individual family living in a country cottage. Through this communication, waste is discharged, the disposal of which in its absence would be a big problem.
Sewer systems, like any other structures, need maintenance. Their condition must be monitored: maintain operational functions, periodically performing ongoing repairs.
If clogging of the system occurs, emergency intervention may be necessary. To ensure all these processes, sewer wells are needed.
Despite all the variety of functions assigned to the sewer wells, all of them nevertheless, one way or another, are called upon to maintain the sewage network in working condition
If it seems to you that the hatches, by which we determine the presence of a well on the street, are randomly located, then this is not so. There is SNiP “Sewerage. External networks and structures ”, which defines the standards regarding the number and location of wells, their types, arrangement technology, as well as the requirements for the maintenance of sewer systems.
Wells arrange in all varieties of sewer systems that discharge domestic, storm and industrial drains
Classification of sewage wells
Structures related to sewer wells according to technical terminology are divided into several varieties.
The division is made depending on what classification features we will use. For example, you can divide the wells according to the material of manufacture, according to their purpose or by the method of their construction.
The type of structure to which a particular sewage well can be attributed depends on the type of classification feature applied to it.
There are the following classification signs and the corresponding types of modern sewer wells. The first is made on the environment, the transportation of which is carried out by the sewer system.
Drainage networks, on which sewer wells are installed, are designed to move sewage of various composition and degree of aggressiveness, these are:
- Household. These include waters that have changed composition as a result of mixing with waste and garbage. Depending on the constituent contaminants are divided into household and fecal.
- Industrial. These include waters that have changed the mechanical and chemical composition as a result of contamination with industrial waste.
- Atmospheric.These include waters formed as a result of active melting of winter precipitation, flood and rain water.
In addition to the listed types of wastewater, sewage receives flows collected by a drainage system, the task of which is to drain the territory or drain groundwater from underground building structures.
Wells of sewer systems are subdivided according to the material of manufacture into:
- Brick. Once, brick was a frequently used material for the manufacture of wells, but over time, brick structures become smaller and smaller.
- Concrete Concrete structures - today it is a traditional version of the material for the sewer well.
- Plastic Obviously, compositions with a polymer base are the material of the future, it is he who will someday replace both brick and concrete.
Plastic or composite prefabricated well structures attract lightness, easy to install. Pleased with resistance to chemical influences during prolonged contact with aggressive environments. They tolerate sharp and smooth temperature fluctuations, do not pass or absorb water at all.
Of course, on the scale of the city there is no sense in making sewer wells made of bricks, but such structures are still found in the autonomous drainage network
Sewer systems are divided into alloyed and exported. The former move wastewater to treatment plants, facilities, or discharge fields. The second only collects effluents for subsequent pumping and removal. Wells included in both types of systems perform both identical and different functions.
According to their functional responsibilities, they are divided into:
- Cumulative. Used for the accumulation of effluents for subsequent extraction and removal. Naturally, they are being constructed in export sewer networks.
- Collector. Designed to collect wastewater from several sewer branches and to direct them to a storage tank, to a sewage treatment plant or to unloading fields. They are arranged both in alloyed and in export branched networks.
- Filtering. They are used to dispose of the liquid fraction of effluents in a natural way. They play the role of compact wastewater treatment plants, transporting freed from environmental pollution into the soil or into water bodies. Accompanied exclusively by the alloyed type of sewage.
- Lookouts. They are being built on collector sections longer than 50 m, as well as at all turning points and nodal connections of highways. Needed to monitor the operation of the sewer system, for periodic cleaning and repair operations. They are arranged in both types of sewers.
- Overflow. They are satisfied in areas with sharp high-altitude drops. The reasons for the construction include ensuring in-depth release into the reservoir and the need for braking effluents on sections of the pipeline with a large slope. They can be present in both export and flooded sewers.
The classification of manholes is much more complicated. We will talk about this a little lower, and now we will consider different types of wells in more detail.
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Wells - one of the most important functional objects of the sewerage. They are included in the septic tanks, built along the entire length of underground utilities to control the operation of the system and clean
The simplest construction option is the "descendant" of a conventional cesspool. It collects wastewater and is pumped out as an absolutely sealed container is filled
Ready-made plastic containers, bricks, concrete rings with a sealed bottom and structures are used in the device for collecting sewer wells
The gray type of drains transported to the well from kitchens, baths, bathrooms, showers, pools is disposed of in an absorption well, part of which is filled with a soil filter for water purification
The absorption, it is also a filtering well, is constructed in the same way as a drive, but without a bottom. If necessary, increase the throughput to the height of the soil filter. Perforated rings are installed.
If the drains of an autonomous sewer system are discharged into a centralized network or directly transported to a treatment plant, a collector type is installed to collect them. It can be common for stormwater, gray drains and well drainage.
On bends and every 25 - 50 m, depending on the diameter and complexity of the underground system, inspection revision and rotary sewer wells are installed
If necessary, to reduce the speed of movement of drains, to bypass an underground structure or to adapt to the relief, differential wells are constructed. Entrance and exit are located at different levels.
Sewer wells in the organization of a septic tank
Cumulative version of the sewer well
Concrete structure drive device
Absorption well for the seasonal dacha
Perforated part of the absorption well
Sewer Manifold
Sewer inspection well
Differential type of sewage system
Storage and filter type
Cumulative is a large sewer well into which all sewage from a private house flows. The required size of this building is determined by the number of people living in the house and the amount of water that they use.
When we talk about the accumulation well, it implies that the place of its use will be a suburban area, and not a city or even a rural network
Typically, the storage well is placed in the lowest located part of the site. This provides the desired angle of inclination, allowing the drains to move spontaneously under the action of gravity through the sewer pipe.
This structure is often made of plastered reinforced concrete rings. For the same purpose, you can use a factory-made plastic container.
The plastic well is convenient both in installation, and in operation. Of course, while installing it, you also need to have some knowledge and skills, but still its installation is easier than working with a concrete analog. A concrete structure should not have gaps or crevices, otherwise liquid waste may leak through leaky seams, spreading an unpleasant odor.
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Step 1: Sewerage device with storage capacity begins with digging a pit, for which you can use an excavator or carry out work manually with a shovel
Step 2: In order for the light plastic container not to be "pushed out" by flood waters in spring and frosty winter, a concrete slab is poured or installed on the bottom
Step 3: A plastic container fixed to the boom of the excavator with cables to the boom is immersed in a foundation pit with a hardened plate. The term for the hardening of concrete is 28 days, in the absence of requirements for the slab 14
Step 4: The tank installed in the pit must be leveled, focusing on the position of the neck. Then it is anchored - tied with a cable to the hinges laid before pouring into the plate
Step 5: In order to strengthen the position of the drive, the pit with it is filled with a mixture of sand and cement. If the tank is surrounded by loose and medium density sands, it is better to strengthen the walls with concrete slabs that will prevent the mixture from migrating and shrinkage of the dump
Step 6: Before filling the pit, the container is filled one third or half with water to compensate for the pressure. The mixture is poured in layers of 30 cm and rammed. When the water level in the drive is equal to the dumping, the tank is completely filled and continue to be dumped
Step 7: A sewer pipeline is introduced into the tank, during which observation and pivot wells must be installed in accordance with construction requirements
Step 8: At the end of work on the sewer wells, including the drive and the inspection, manhole rings are installed, to which the manholes are connected
Digging a pit for installing a storage tank
Pouring the concrete slab to the bottom of the mine
Immersion of the tank in the prepared pit
Alignment and anchoring of the drive in the development
Strengthening the walls of the pit before filling
Rules for filling a foundation pit with a mixture of sand and cement
Sewer installation
Arrangement of the neck of the storage tank
Another point for the reception and partial disposal of wastewater is a filter well. Sewage also rushes into it by gravity, but it doesn’t stay in the sealed tank until it is transported, but it moves into the underlying soil, passing through a kind of filtration.
Filtration wells are constructed without a bottom in the usual sense. At its base, a multilayer, multi-stage natural filter of sand and gravel of various fractions is arranged.
For the manufacture of filtering structures, brickwork or concrete rings are also most often used, but their diameter, as a rule, is smaller. The design of this well is different in that it lacks a bottom. The structure itself is covered with either coarse sand or gravel.
The idea of such savings on cleaning the storage well is not bad if the effluents really undergo high-quality filtration and do not poison the soil
Functions and features of manholes
In order to monitor the condition of the sewer system and timely eliminate the problems arising in it, inspection sewer manholes are necessary. Therefore, they are placed in places where system failure is most likely.
This manhole is both nodal and control: such a combination of functions is quite acceptable, because no one will allow unmotivated increase in the number of these structures
They should be present in such places:
- where the slope of the pipeline or its diameter changes, which determines the rate of movement of wastewater and the width of the stream;
- where the flow changes direction;
- where side branches are connected to the main pipeline;
- where to observe, despite the fact that there are no special prerequisites for breakdowns.
Observation structures are usually placed in a straight line, observing a distance between the wells of 15 meters. If we are talking about a private house, then the first viewing well should be at a distance of not less than 3 m, but no further than 12 meters from the house.
The main function of these wells is still not the elimination of the resulting clogging, but its prevention. When the sewage system becomes clogged, a return flow of sewage is possible. To prevent this from happening, experts recommend that a check valve be provided in the first viewing structure, which, in the event of clogging, will close the exhaust pipe.
Viewing wells are also divided into several subspecies.
Changing the direction of flow:
- Nodal They are installed above the unit, that is, in the place where the side branches are connected to the main pipeline. At the same time, there can not be more than one incoming and three outgoing pipes in the construction tray.
- Rotary. Such structures are located above the place where the pipeline turns. There is a rule according to which the angle of rotation should not be less than 90 degrees.
The rotation should be performed with smooth rounding, the radius of which can be from one to five diameters of the incoming pipe.
Rotary models can be very diverse, but there is a limitation in their design: it is impossible for the rotation angle to be less than the direct
Direct-flow structures in places where there is no change in the direction of flow and branches:
- Control. These wells are installed in places where sewage is discharged into the sewer. With their help, the quality of the cleaning performed is monitored.
- Flushing. They are placed at the beginning of the network for washing it.
- Linear They are used for periodic preventive inspection of networks and for their cleaning.
Sometimes with the help of one structure, not one, but several tasks can be solved at once. Despite the abundance of functions that are assigned to these structures, all observation wells are arranged approximately the same.
They have a manhole cover, an inlet neck, a well shaft, its working chamber and a bottom - outgoing and incoming pipelines are specially connected here to facilitate the diagnostic procedure.
Reinforced concrete is usually the material for manufacturing inspection wells, but recently, plastic containers are in great demand. Installation of such structures is carried out in the ground. They become the connecting parts of the sewer pipeline.
If this viewing structure is done in summer cottages, then some craftsmen adapt sewer pipes with a large diameter for such purposes. Typically, such a design copes with the tasks for the sake of which it was built.
Sewer manholes are positioned in such a way that access is guaranteed for monitoring the technical condition of the system, for cleaning or repair (+)
For servicing drainage and storm sewer systems, inspection wells are also installed, the types and features of the installation of which you can read in another popular article on our site.
Features of differential species
The main function of the sewer wells of the differential type is to change in height and adjust the speed of the flow. These structures can have a rather diverse design.
Pay attention to how diverse the differences are, for which various sewer manholes of the differential type should and will be used.
Sewer overflow wells are installed there:
- where the depth of the inlet pipeline decreases;
- where there is a risk of a sharp change in the flow velocity;
- where there is a highway intersection of underground structures;
- where this well is the last on the way to move the effluents before dumping them into the reservoir; Such a structure may have a flooded outlet.
Given the diverse tasks that are assigned to these structures, the internal structure of these sewer wells can have different design solutions.
According to the type of differences, the designs are divided into:
- tubular, at the base of which a vertical pipe is necessarily present;
- cascade - multi-stage mine-type structures to reduce the flow rate;
- with a practical profile, having a water sink in the downstream;
- equipped with a water-drain wall;
- fast currents are short sections of the pipeline that are installed under a significant slope.
The last of the listed wells can also be used in autonomous sewage, in the case when the flow volumes are not large enough to ensure the cleaning of sewer pipes.
Differential wells sometimes have a rather complicated internal structure, so it is more appropriate to build them not from concrete, but from reinforced polymers
There is one more type of overflow wells, which are installed on those sections of the sewer network into which fire hazardous or explosive substances can enter or form.
Such wells are equipped with water locks. The specificity of such structures is that the flow level here changes in the opposite direction: instead of lowering, it rises.
This effect is created using a special camera in which the preliminary accumulation of effluents occurs. In case of emergency, the water valve will prevent the fire from spreading.
What are these wells made of?
Most of our fellow citizens are sure that all sewer wells are made of concrete. And they are almost right.
Typically, reinforced concrete rings are used to construct the wells, which are located on the lines of the central city sewer system. Only occasionally for the same purposes do cubes or slabs of the same concrete be used.
Most of the sewer well shaft is constructed using the main reinforced concrete rings, and additional rings are necessary so that the model fits into the drainage network as best as possible
Modern producers are actively mastering the production of polymer products, which in all respects surpass reinforced concrete analogues. Gradually, although not as fast as we would like, they conquer the Russian market. But while polymer structures are limited in application, concrete structures will still retain their leadership positions for some time.
Reinforced Concrete Wells
When the norms and rules were created, which to this day regulate the procedure for creating sewer networks, no one heard of high-strength polymers.
And to date, sewer cleaning can be done manually. One worker descends into the well in order to push the wire to the side of the clogging that has occurred, while his assistants at the top rotate its second end.
Wells for all types of sewerage vary in depth and in size. According to these characteristics, they are divided into serviced and inspection types. The first require immersion in the staff. The health and technical condition of the second can be monitored from the surface.
Someday, concrete wells will be completely replaced by structures made of polymers, then the heavy manual labor associated with the elimination of blockages will disappear
The standard sizes of serviced wells were calculated in such a way that a person could not only fit in it, but also work. The size of the structure of 700 mm is minimal. A series of standard sizes continue to 1000,1250,1500 and 2000 mm. These standards have been preserved in our time.
Taking into account these normative sizes, round plates are also produced, which are used as a base or upper floor with a hole for the hatch with a diameter of 700 mm. Thus, the components of a standard reinforced concrete well are:
- base or bottom in the form of a circle or rectangle;
- rings making up the shaft;
- upper ceiling with a round hole for the hatch;
- polymer or cast iron manhole cover.
The round shape is explained by the fact that a structure with just such a geometry best exerts resistance to the surrounding soil.
The manufacturer does not know in advance where and how the reinforced concrete elements will be used, therefore they are manufactured in a standardized, even form, and are provided only with embedded parts - hinges, which are supposed to be used during installation.
In order to get a pipeline into the well, a hole must be punched in the lower reinforced concrete ring, and a tray of the shape that is needed should be mounted on the bottom plate. This design forms the basis of manholes and even wells, in which the device can be somewhat modernized taking into account the design features of a particular model.
The height of the well depends on the number of standard and additional rings that are used in the process of its construction. In order for the subsequent ring to be installed as tightly as possible to the previous one, it is necessary to remove the extra mounting loops. All cracks in the structure should be covered with cement.
Since such measures are still not able to provide a normal level of waterproofing, sewage from a reinforced concrete well pollutes the soil, while groundwater, on the contrary, penetrates the well and contributes to its overflow.
Plastic products for inspection
Wells made of modern polymers have provided sewer designers with a whole new level of freedom.
A technical revolution arrived in a very timely manner, thanks to which mobile complexes arose. With their help, the maintenance of sewer pipelines can be carried out without the participation of people who are lowered into the wells.
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Modular well assembly scheme
Functional bottom of the polymer well
The tightness of the connection elements
Installing the neck of a sewer well
And this means that the size of the wells can not be customized to fit an adult man. You can replace a bulky structure with a compact device up to 300 mm in diameter. Another advantage of polymer products is their low weight. The size of such a well can be precisely tailored to the needs of a particular sewer network.
Modern polymer wells can be classified according to various criteria. Well shafts may differ in the material from which they are made. They can be smooth, corrugated and combined.
In turn, smooth and corrugated shafts can be single-walled and double-walled. Moreover, the design of the well itself can be telescopic, that is, retractable.
Even if the well itself is made of concrete, we recommend buying a polymer hatch for it: it is a very durable and sturdy product that, unlike a cast-iron one, will not be stolen
Initially, polymer models were made of two parts: the neck and the tray. The chute part was supplied with piping wiring corresponding to the purpose of the well. Currently, direct-flow models are also provided for direct-flow structures.
A huge advantage of polymer products is the complete waterproofing of their shafts. This gives such facilities an absolute advantage, which over time will provide them with priority in the market for building products.
This video demonstrates the advantages of models made of modern polymers over reinforced concrete products.
Modern plastic wells not only look more attractive than their reinforced concrete counterparts, they weigh less and are better waterproofed. The future, of course, is theirs.
Without a sewer system, it is impossible to imagine the life of a civilized society. And without sewers of various types, not a single sewer system can carry out its work. Now you have an idea of what these structures are like, how they are built and what materials they are made of.
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