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

By Admin | Garden And Buildings / Communication
11 May 2016

Artesian wells to help resolve the issues related to water supply of country houses, such as: drinking water, irrigation of crops, water use for other purposes.The climate of the region make the owners of private houses to think about the placement of all water-lifting equipment below the frost line.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, found in the waste products of its neighbors.To prevent these troubles help caissons for wells.


functional responsibilities, geometric differences ↑

In view of the caisson is a commonbox or barrel with a neck which is closed hatch, usually insulated foam.There was widespread, cylindrical caisson, in whose diameter is the main part of one meter and a h

eight of not less than two meters.If the diameter of the device less than a meter, then it is not possible to carry out maintenance and caissons with a larger diameter are different due to the high cost of spending a lot of material.

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 device allows not only reliably 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.

Moreover, the caisson can accommodate within itself is the necessary equipment for correct operation of the system as a pressure switch, the pump control panel, the membrane accumulator and other automatic devices to reliably protect them from unauthorized access.

Types caissons, their advantages and disadvantages ↑

Currently there are three types of caissons for the wells:

  • metal;
  • concrete;
  • plastic.

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

Metal caissons
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 generation of such 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, whose thickness should be no less than three millimeters.

Such equipment requires a mandatory anti-corrosion treatment on the outside and inside padding.But it will serve for several decades.You can install a metal caisson wells for their own hands, thus significantly saving on assembly work.

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

Concrete caissons made of reinforced concrete rings.Installation of such devices requires significant effort and financial costs.These designs are the most expensive.Concrete rings 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 construction and groundwater still get inside.

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

Plastic caisson
economical plastic caisson is not "afraid" rust and corrosion, is excellent for decades

Plastic Caisson for wells made of polymer materials, the thickness thereof is about 20 mm.Such devices are very durable and have a long service life.They are not subject to corrosion and 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 groundwater under the pressure they can strongly deformed and "float" on the surface because of the light weight.

self-assembly of the box for a well ↑

Installing the caisson to the well in the home does not require any special skills.This work is under the power of anyone with the slightest knowledge of the process.So, how do the caisson to the well alone?

The design of the box for a well
design for the well caisson

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

pit digging, taking into account the fact that the neck of the structure should be above the level of the surface of at least 10 cm. This will prevent rainwater and other surface water in the caisson.

How to fix the caisson in the ground
How to fix the caisson in the ground

now proceed directly to the installation of the caisson.At the bottom of the device should be designated space for the hole required for the casing.The hole can be moved in any direction, based on your personal requirements.

Installation of the equipment in the caisson
Installation of equipment in the caisson

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

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

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

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

the casing at the same time should be cut at a height of 300-500 mm from the bottom of the box and make it tapering by means of longitudinal cuts on the end and a sledgehammer.

caisson should prepare in advance: in its walls to be welded bochata needed to display pipes in the trench.One tube will need to enter the cable and the rest to bring the water system.

Next the caisson is set on the excavation so that the axis of the sleeve and the casing coincide.First, the design installed on the boards after pulling whom she falls into a pit on the casing, serving as a guide.Now caisson exhibiting horizontally on a level, which requires between it and the walls of the pit to expose the boards.

Connection of valves
connection of valves

The liner should be around the perimeter welded to the casing and then make HDPE-pipe inside the caisson through predefined nipples.All welds are processed primer composition.

Important: HDPE pipe nipple 40 is required 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 pipe nipple is carried out within the IPA junction with an internal thread.Through one of the pipes weed out the electric cable for powering the pump.The result is a completely sealed structure which protects the mouth of a water well.

For best results, you can mount a second cover in the caisson Styrofoam and plywood at a distance of 30-50 cm from the first, and the upper part of the structure in addition to warm.

Do not forget that the slightest violation of the rules of the installation can cause failure of the entire water intake system, so it is better to invite a specialist who can make an adequate sequence of actions and organize its accurate execution.