Triple protection of the well: how to protect the column from freezing, dirt and thieves

Here you will find out:

• Is it necessary to insulate the well from the cold
• Well insulation materials
• Well operation modes and isolation methods
• We insulate the entrance water pipe
• Do-it-yourself casing insulation
• Options for additional protection during installation
• Plastic caisson as the best way to insulate

Before insulating a well for the winter, you need to think through all the subtleties. Choose the best thermal insulation materials, as well as available options for wells of different designs.

Is it necessary to insulate the well from the cold

Wells are insulated for the winter for the following reasons:

• If a well for sand or an artesian well has an upper casing in a caisson pit, then when water passes through the pipes from the head to the house in an open section of the caisson, it can freeze and, when expanded, damage the water supply system.
• If the water level in the well is high, its presence close to the surface can cause freezing and corresponding damage to the casing pipes, in which case it will become impossible to use the well.
• Any submersible electric pump has a check valve in the area of ​​the outlet pipe, it is built into the pump model itself or installed separately by screwing it onto the upper pipe connection. Thus, it prevents the outflow of water into the well and it is always in the standpipe. A similar situation is observed with surface electric pumps, where a check valve is installed at the end of the supply hose. In severe frosts, water can freeze on the suction section of the HDPE pipe and its supply to the building with pumping equipment will stop due to the ice plug.

Diagram of the caisson design and well insulation

• In many caisson pits, surface pumps and equipment are installed - if the pump is shallow underground along with automatic equipment, they also need protection from the cold due to the constant presence of water in them when they are turned off.
• The need for insulation also arises in the absence of the owners for a long time, and if during operation the well is subjected to short-term conservation, the water frozen in the casing and pressure pipes will make it impossible for its further supply.
• Some types of wells do not have a caisson pit - the construction of the upper casing is located at or slightly above the ground surface. In this case, you need to think about the fact that the well needs to be insulated at its mouth to ensure uninterrupted water supply.

Connecting an electric pump via a borehole adapter

When and where is it better to drill a well on the site

Plumbing in a private house

Autonomous water supply today cannot be called a luxury. Rather, it is a necessity for owners of country and private houses remote from central water supply systems. You can correctly equip the system if you are serious about choosing the time when it is better to drill a well.

It is also important what its location will be.

Well design for water (for sand).

It is believed that all kinds of construction and drilling work should be carried out in warm weather. This is due to the fact that in winter the soil freezes, and this can make manipulations more laborious. But with the advent of modern technology, it became possible to drill at low temperatures.

Moreover, there are almost no restrictions on the time of year.If you are wondering when is the best time to drill a well, then it is worth knowing that each season has its pros and cons in terms of the period of work.

Well insulation materials

There are several methods and materials with which you can insulate a well with your own hands. The most important task is to prevent the well from freezing.

In order not to get trapped in the winter due to an idle well, it is better to think about its insulation from summer and spring.

The following materials are used as insulation:

• Sawdust;
• Dry leaves of trees;
• Straw;
• Peat;
• Hay.

Using each insulation material separately will not be effective. They are an additional material that prevents the well from freezing.

Use natural materials as additional insulation.

Natural materials are not 100% protected from moisture ingress. If they get wet, then their effectiveness decreases significantly. That is why it is necessary to consider these heaters from the point of view of additional ones. Mineral wool heaters and polystyrene foam should be used as the main heaters of the well as secondary insulation. Thermal insulation material is used when the well is characterized by a high level of groundwater. You can read the advice of summer residents about this. The operation of their wells in the winter was in full swing.

To insulate a well, different methods of insulation should be used. The most effective is the use of natural materials together with "artificial" ones in the form of mineral wool insulation and foam. This combination of materials will prevent the well from freezing in the cold winter.

Heat insulating materials

A competent solution to the problem of insulating water supply wells in regions with a cold climate depends on knowledge of the features of heat-insulating materials. In the southern regions and places of deep bedding of the water supply system, it is enough to fill the head of the well with sawdust or close it with straw.

Well insulation materials.

Many thermal insulation materials are used in harsh climates. They are used in combination when there is a threat of pipeline freezing.

Penoplex is widely used, containing the smallest air bubbles. It is distinguished by low thermal conductivity, rigidity, moisture resistance. It is suitable for thermal insulation of external and internal surfaces of coffered chambers, external and underground areas.

Penofol is a self-extinguishing polyethylene foam. This soft sheet material does not contain harmful additives and reflects heat well.

It is suitable for protecting the inner surface of underground chambers and pipelines without external stress.

Mineral wool, glass wool (fleecy insulation) has high thermal insulation properties. For its laying, a box is made that covers the head of the wellhead.

Using a heating cable

The types of heating cables are resistive, having small dimensions, and self-regulating (SGK), which change the heating temperature of the sheath depending on the temperature of the water that surrounds them, the product.

Well insulation when using a heating cable.

In contrast to resistive SGCs, they have a higher efficiency if we take into account the characteristics of HDPE products, which are most often used for water intake from a well. They have low thermal conductivity, therefore, when installing SGK, you need to remember the consequences of their placement inside and outside the pipeline.

On its surface, the flying cable has a lower efficiency than inside. To increase the performance of the product installed outside, additional insulation (shell) should be used.

Thermostats of the corresponding length are sold with the cables, and in addition to the individual wire models, three-entry fittings are provided.They are needed in order to connect to a pipeline made of low pressure polyethylene.

So what method of insulation should you choose for your well?

The question is quite complicated, since in order to choose one or another method of warming a well for the winter, it is necessary to deal with two key points.

1. How often will this well be operated during the winter?
2. What is the specific winter temperature in your area?

A few practical tips on how to make the right choice.

1. If your wells will not be operated at all in winter, then before the onset of cold weather it can simply be mothballed - lubricate all the elements, wrap the head using old rags, and wrap it with a layer of polyethylene.
2. The most effective and high-quality insulation technique is rightfully considered to be the arrangement of the caisson. Thanks to it, you will be able to use your well all year round, even at the lowest temperatures. Moreover, the construction of such a structure will provide an opportunity to install hydraulic devices outside the area of ​​the house. Nevertheless, the construction of a full-fledged and dimensional caisson will cost a pretty penny.
3. If the water intake structure will be operated only from time to time (say, every weekend when you come to the dacha), then the heating cable will be the best option. You can turn on this cable immediately after you arrive, after which, after about ten minutes, the water supply system at the site will be ready for further operation.
4. Finally, if the climate in your area is relatively warm, then in order to be fully prepared for possible frost, you can build a second casing, equipped with a thermal insulation layer.

For a more detailed acquaintance with the insulation procedure, we advise you to watch the thematic video presented below.

Video - Thermal insulation of a water well

Well operation modes and isolation methods

The choice of one or another method of insulation should depend, first of all, on how often the well will be used.

1. If we are talking about permanent operation, then a constant pressure will be maintained in the pipes, and the water there, if theoretically, should not freeze. But the fact is that the liquid can move and not all the time, but only when water is used, so if there is a prolonged downtime (say, at night), then it may well freeze in the pipes, even under pressure. Moreover, the head can contain special technical devices (battery or pump), which are particularly sensitive to subzero temperatures. For this reason, it is necessary to insulate wells for operation, but in this case, one also cannot do without passive methods - we are talking about a caisson or a thermal insulation layer.
2. And how to insulate a well if the pipeline is used seasonally (for example, only in summer), and in winter all pumping equipment is turned off? And the well itself is being preserved? No way, you should simply drain all the liquid from the system, pipes and taps, and then carefully preserve them.
3. Finally, in the case of irregular operation, when water will be collected even in winter, but, for example, only on weekends, it is possible to equip an external electric heating near the head and the supply pipe. This kind of equipment can be turned on when you arrive at the dacha, and after a certain time you can fully use the well.

Insulation of an underground pipe system

It is not necessary to use waterproofing and heat-insulating materials in winter, since you can insulate a well on the street using layers of soil... Such layers do not freeze and do not put pressure on the water supply system. The complexity of installation work depends precisely on the depth of the line.

The type of eyeliner also matters: top, bottom. With top liner in winter, additional means will be required to retain heat. With a lower liner, the amount of insulation decreases, since there is a layer of soil.

It is recommended to use ordinary sand, since it is possible to insulate the caisson for the well with bulk materials. In winter, expanded clay, cotton wool with fiberglass, and polystyrene will be effective means.

We insulate the entrance water pipe

In addition to the mine itself, the pipeline entering the well and the house also needs thermal insulation. As a rule, in the country, the highway leading from the source to the house is laid shallow. This is due to the technically narrow possibilities of carrying out the work. That is why you have to additionally insulate it.

Method one into another

Take a plastic or metal pipe with a diameter larger than the water supply. We will lay it on the base in a trench and bring it to the well, house and equipment. In fact, it will act as a sleeve or case.

It is not necessary to put into the shaft of the mine, 10 centimeters inside is enough, we will isolate it. To facilitate the process, 20-25 centimeters of sawdust is first poured into the trench, on which a pipe is placed. A soft insulation, glass wool, or penoflex is thrown from above. The structure can be covered with soil. We push the water pipe into the case, leading it into the house and the well.

An air cushion between the insulated sleeve and the water pipe will create an additional obstacle to the cold.

Important: for additional waterproofing, the case with insulation is wrapped with roofing material or polyethylene.

Thermal insulation using penoflex

Modern material, flexible and durable. It looks like cylinders from 3 to 6 meters long. They differ in thickness and density. There is a foam flex for each pipe diameter. In this case, you do not need to use a sleeve. The pipe is completely insulated before laying, gluing all joints with metallized tape. Insulation of highways underground, using Penoflex technology, is possible at a depth of 70 centimeters.

Do-it-yourself casing insulation

During direct installation of the casing, it is impossible to isolate it properly. Therefore, the well is insulated for water after installation.
Thermal protection of the shaft along the inner wall of the pipe will lead to a mandatory narrowing of the bore diameter, therefore, the casing is insulated only from the outside.

First step. We dig in the source from all sides in a circle to a depth of up to three meters. It should be counted from the upper cut of the embankment. We strengthen the walls of the ground with wooden boards or boards. You can also use metal sheets by twisting them around the trench.

Second step. Having compacted the base of the pit, we pour insulating material on the bottom. It can be anything, even old down jackets or quilted jackets. It is necessary to lay the insulation carefully, pressing it tightly against each other.

Step three. Gradually filling the entire hole with the casing, it is closed. The upper part of the shaft, which we have insulated, is in an aggressive environment. Therefore, it must be closed with a lid. It is made from a sheet of metal or a wooden shield, with a diameter larger than a dug hole. This is necessary so that the rainwater does not wet the insulation.

You can protect the upper part of the well by building a small box with a roof over it.

Foam shells can be used as insulating materials. This method is very simple and reliable. It is enough just to choose the required diameter and fix the halves on the pipe.

Thermal insulation of a well with a high groundwater level is more difficult. In addition to thermal insulation, waterproofing of the insulation itself or the choice of a material that is not afraid of water will be required.

How to insulate a well on the street with your own hands

If water supply is organized in a private house, pipe insulation can be done on your own.Most often, an electric cable is used for heating, placing it both outside and inside the water supply system.

Insulation of the caisson or pit

In the process of work, the caisson chamber is covered with sheets of heat-insulating material, you can use foam and expanded polystyrene. To fix them, use foam or glue.

Insulation of the casing and head

In order to protect the wellhead and head of the well, a wooden box is made. Glass wool is laid inside, it is often replaced with expanded clay or other heat-insulating materials.

How to insulate a pipe from a well to a house

If the pipes pass above the groundwater level, in a layer of soil that freezes in winter, an electric cable is thrown for their insulation or a shell is built to protect it, making it from polyurethane foam or expanded polystyrene. You can use 2 methods, insulating the pipeline and additionally placing a small piece of cable at the mouth.

Insulation of the liner to the house

If electrical heating of the wellhead is used, the liner is not additionally insulated. In its absence, the pipeline is closed with a shell, and in addition, glass wool is additionally wrapped around it.

Citizens with private houses and land plots have problems with the location and insulation of the well. Winter is a time of cold weather and severe frosts, when such a structure requires the use of special anti-freezing agents. Several methods are used on how to insulate a well for the winter with your own hands on the street, as well as under the house. Here you can not do without polystyrene, expanded polystyrene, heating cable.

Options for additional protection during installation

When carrying out installation work, additional protection options are provided. In order to be able to mothball the pipeline, the pipeline network is made with a slope towards the source with the installation of a reverse-acting valve. When the pumping equipment is turned off, water from the pipes by gravity rolls back into the shaft, while it is important that there are no cavities where it could linger.

Sometimes the water supply pipe is placed inside a larger pipe. The air gap between them insulates the structure, the outer pipe can be introduced into the heated room, in this case the efficiency of the system is significantly increased.

Attempts to prevent water from freezing by increasing the internal pressure in the pipeline are doomed to failure. Suffice it to recall from the school physics course that the temperature of its crystallization decreases by one degree with an increase in pressure of one hundred and thirty atmospheres, but such parameters are unattainable in domestic conditions.

Plastic caisson as the best way to insulate

If you place the head of the well and all the pipework below the level of freezing of the soil, then you will not have to worry about their insulation. At such a depth, even in the most severe frosts, water will not freeze in the well, since its temperature will be constantly above zero. To accomplish this task, it is necessary to dig a pit around the wellbore to a depth of 2-2.5 meters and install a caisson. For one hundred percent reliability, the walls of the caisson and the cover of its hatch are insulated with mineral wool or foam.

Well insulation using a plastic caisson installed in a dug pit around the casing to a depth of 2.5 meters

At extremely low temperatures in the caisson well, it is recommended to install an additional cover with insulation directly above the well in order to exclude the possibility of water freezing in the pipes. Installation of this element is carried out in advance, since it is undesirable to open the hatch in severe frosts.

How to build a caisson

Step one. A container (made of metal or plastic) of the required dimensions is being prepared, you can, as an option, use a barrel for two hundred liters. And if the installation of additional devices is not planned in the caisson, then such a capacity will be more than enough.

Step two. A pit breaks out around the head. It is important that the bottom of the dug pit is located somewhere 35-45 centimeters below the level of soil freezing (the calculation is made for a very cold winter). As for the diameter of the pit, it should protrude from the head about 50 centimeters on each side.

Step three. The bottom of the pit is covered with a "pillow" made of gravel and sand. The "pillow" layer should be approximately 100 millimeters.

Step four. A hole is made in the bottom of the barrel for the pipe, and in its lateral part - for the supply of the pipeline.

Step five. The barrel is installed on the bottom of the pit, as if put on the head.

Step six. Inside this barrel, the head is connected to the pipeline. Actually, in such a large barrel, you can even equip a special surface pump or, as an option, equipment for water distribution. In addition, even a special drainage pipe can be cut into its bottom to drain accumulated condensate deep into the soil.

Step seven. A thermal insulation layer is laid around the barrel. It is important that for this a heater is used that is immune to the aggressive effects of the soil (for example, expanded polystyrene). In addition, the barrel can be wrapped on the sides with a layer of mineral wool, but in this case, waterproofing should be laid on top of it.

Step eight. The caisson is closed with a lid, to which a ventilation pipe is fixed. The top of the barrel must also be insulated with the same insulation.

Step nine. The pit is filled up. That's it, the miniature caisson can be used! A similar design is suitable for a small well.

Insulation of the caisson structure for the winter

To reliably insulate the well, you cannot do without special materials. The main parts of the caisson structure are located underground, therefore special requirements are imposed on the materials for their insulation. They should not lose their performance under soil pressure, wrinkle and deform.

We need excellent water-repellent properties, since when soil water penetrates inside the insulation, it will be destroyed during their crystallization. If the material of the heat insulator is of interest to rodents, they will pull it apart or gnaw through passages in it, thus destroying its insulating qualities.

It is possible to insulate the caisson for the winter both from the inside and from the outside. With the internal location of the insulation, the integrity of its layer is not affected by soil movement and other unfavorable external factors. The most commonly used foam or expanded polystyrene.

From the outside, it is necessary to insulate plastic products, as they become brittle at sharply negative temperatures. The heat-insulating layer must be protected from the effects of water, rodents and insects, otherwise it will not last long. At the same time, the cylindrical shape of the caisson requires the least consumption of insulation material, but the rectangular shape facilitates its installation.

Thermal insulation of a well with a high level of groundwater

The well drilling process is not difficult. It is more difficult to keep it running smoothly, especially during the colder months. The winter period is the most difficult.

Too cold temperatures can cause moisture in the upper soil layers to freeze.

The depth of the soil freezing line can fluctuate depending on the climatic conditions of a particular area. Problems with water supply can be avoided by first taking care of choosing the correct thermal insulation technology. It is necessary to insulate the well before the onset of the first frost.

How to install the caisson:

• Dig a pit around the borehole column.
• Equip the bottom of the pit with a gravel "cushion". Pour it with concrete mortar.
• In the caisson, or rather, at its bottom, it is necessary to make a hole, the diameter of which will correspond to the casing pipe and the water supply.
• Cover the walls of the structure with insulation, on which the waterproofing is laid.
• Side sprinkling is made from a sand-cement mixture.
• The dug soil is poured back, then the caisson lid is installed.

You don't need to spend a lot of money to insulate pipes.
An effective but expensive method of thermal insulation is the installation of a cable equipped with an electric heater. It is worth noting that when choosing this method, it must be borne in mind that the thermal insulation material must withstand the high temperature of the heated cable. It is better to entrust the cable laying to specialists.