Water supply

Caisson for wells - the types and self-installation, installation technology description

Caisson for wells

Artesian wells to help resolve the issues,associated with the water supply of country houses, such as: drinking water, irrigation of crops, the use of water for other uses. Features of our region's climate forced the owners of private households to think about the placement of all water-lifting equipment below the level of soil freezing. Otherwise, the system may freeze. In turn, this arrangement leads to communications ingress of groundwater, which significantly affects the purity of drinking water. Probably no one wants, the spigot, find it neighbors the waste products. To prevent these troubles help caissons for the wells.


  • Functional responsibilities, geometric differences
  • Types of caissons, their advantages and disadvantages
  • Self-assembly of the caisson for wells

Functional responsibilities, geometric differences

In view of the caisson is a commonbox or keg with a neck that closes the hatch cover, usually insulated foam. There was widespread, cylindrical caisson, in whose diameter is the main part of one meter and a height of not less than two meters. If the diameter of the device less than a meter, then it is not possible to perform maintenance and caissons with larger diameter are different due to the high cost of more material flow.

Chambers of various shapes

Chambers of various shapes

Caissons - damp-proof equipment,seal the outside and inside primed. For better thermal insulation the inner surface of the device is covered with foam. This simple tool allows you to not only safely protect the system from freezing and falling groundwater, but also to become a small underground room, allowing in all weather conditions to carry out necessary repairs.

In addition, it allows you to put inside the caissonitself is the necessary equipment for the correct operation of the system as a pressure switch, the pump control panel, the membrane accumulator or other automatic device, reliably protecting them from unauthorized access.

Types of caissons, their advantages and disadvantages

At the moment, there are three types of caissons for the wells:

  • metal;
  • reinforced concrete;
  • plastic.

Let us consider each type, what are their advantages and disadvantages.

Metal caissons need to be applied to anti-corrosive coating on the outside and inside of the primer layer

Metal caissons need to be applied to anti-corrosive coating on the outside and inside of the primer layer

Metal caissons - it is the older generationsuch devices. Normally used for the manufacture of stainless steel or aluminum, since they are the most resistant to corrosion. Besides it relates to flexible metal materials, thus preventing cracking. Qualitative metal caisson made of steel, the thickness of which should be less than three millimeters.

Such equipment requires mandatoryanticorrosion treatment outside and inside priming. But it will serve for several decades. You can install a metal caisson wells to their own hands, thus significantly saving on assembly work.

The caisson of reinforced concrete rings: strong, almost eternal, but rather expensive, besides the need of insulation

The caisson of reinforced concrete rings: strong, almost eternal, but rather expensive, besides the need of insulation

Concrete caissons are made of concretereinforced rings. Installation of this device requires significant effort and financial costs. These designs are the most expensive. Concrete collars placed on a specially prepared ground. Since the concrete - a very hygroscopic material caissons produced therefrom, require enhanced waterproofing with the outside. In practice, very rarely achieve absolute moisture-proof design and groundwater still get inside.

Another significant disadvantage of concreteRings - bad insulation. Very often in extreme cold equipment, enclosed in this type of caissons, still frozen. A heavy weight of the material leads to a gradual subsidence of the device as a whole, resulting in deformation of the equipment used.

Economical plastic caisson is not "afraid" of corrosion and rust, it is perfect for many decades

Economical plastic caisson is not "afraid" of corrosion and rust, it is perfect for many decades

Plastic caisson for a well madeof plastics, the thickness thereof is about 20 mm. Such devices are very durable and have a long service life. They absolutely do not corrode and are waterproof. Installing plastic caisson can save on waterproofing and corrosion-resistant formulations. Construction of plastic or fiberglass are not recommended for protection of wells, as under the pressure of the groundwater, they can be seriously distorted, and "float" on the surface because of the light weight.

Self-assembly of the caisson for wells

Installation of the caisson on their own are not wellIt requires any specialized skills. This work is under the power of any person who has the slightest idea about the process. So, how do caisson wells for yourself?

The design of the well caisson

The design of the well caisson

Around the need to dig wells finished pit depth of not less than two meters and with dimensions exceeding the dimensions of the caisson by an amount not less than 10 cm in each direction.

Pit digging given the fact that the neckconstruction should be above the level of the surface at a distance of not less than 10 cm. This will prevent the ingress of rainwater and other surface waters in the caisson.

How to fix the caisson in the ground

How to fix the caisson in the ground

Now proceed directly to the installationof the caisson. At the bottom of the device should indicate a place in the hole required for the casing. The hole can be shifted in any direction, based on your personal requirements.

Installation of the equipment in the caisson

Installation of the equipment in the caisson

Council: If you plan on placing the accumulator in the caisson, a hole under the casing will need some shift from the center. This is to ensure that after the installation of the pressure tank has the ability to pull the hatch tool.

Important: cable and hydraulic conclusions should go to the place of entry of the pipeline in the house.

The main thing that in the end casing hit the hatch. The sleeve is welded into a hole cut out of larger diameter than the pipe itself, and a length of 10-15 cm.

Tip: Before welding the sleeve necessarily put it on the tube to make sure it can be done with a small margin.

Casing thus should be cut at approximately 300-500 mm from the bottom of the caisson and to make it taper by means of longitudinal cuts at the end and sledge hammers.

Caisson should prepare in advance: in its walls to be welded bochata required to display pipes in the trench. One tube is needed for cable entry, and the rest to bring the plumbing system.

Next, the caisson is mounted above such excavationas to the axis of the sleeve and the casing coincide with each other. First, the design installed on the boards after pulling which it falls into a pit on the casing serving as a guide. Now caisson exhibiting horizontally on a level, which is necessary between them and the walls of the pit to expose beams.

Connection of valves

Connection of valves

A sleeve around the perimeter should be welded to the casing and thereafter start-HDPE pipes inside the caisson through a predetermined nipple. All welds are processed primer composition.

Important: for HDPE pipes 40 required nipple 1.5 inches, and for HDPE 32 - 1.25 inches. If the pipes are hard to pass the inner surface of the pin is treated coarse file.

Sealing of pipes inside the nipple madeIPA junction with the internal thread. Through one of the pipes to weed out the electric cable feeding pump. The result is a completely sealed structure that effectively protect the mouth of the well water.

For best results, you can mount a secondcover in the caisson of the foam and plywood at a distance of 30-50 cm from the first, and further insulate the upper part of the structure. Do not forget that the slightest violation of the installation instructions may lead to failure of the entire water intake system, so it is better to invite an expert, able to make an adequate algorithm of actions and organize its precise execution.

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