To fence not puchilo

One of the difficult tasks faced by the owners of country houses and suburban areas - construction of the fence in the humid soil, exposed the so-called frost heaving. Often this becomes a real problem: in cold soil saturated with moisture expands and pushes upward hammered support and drenched foundations. The strength of the natural "jack" is sometimes such that the profiled sheet steel is torn like paper and brick fences on capital foundations are cracked.

Soils, in varying degrees, exposed to frost heaving, are found in many regions, so users FORUMHOUSEWe have accumulated considerable experience in dealing with this enemy fences and foundations. Let's try to summarize it and to understand the advantages and disadvantages of various options fence construction on heaving soils.

Mfcn (participant FORUMHOUSE):

- If the ground puchit, then no proper sampling weight can not stop it. Even small diameters of the pillars will not help, because the shear stresses are still to mangle it with frost heave.

Experienced Gameday warn universal solutions, alas, does not exist. Thoughtlessly using other people's good example or advice "skilled", the owner of the new fence is in the first winter to get a nasty surprise in the form of a raise or lop-sided pillars. Therefore, the construction of the fence should be started only after you have decided on the type of soil and calculate the possible risks. Do not interfere, and information on how to behave before neighbors built fences. But here we must be careful: settings that affect the degree of heaving soils may vary even in the surrounding areas.

To determine the degree of self-heaving need to know the depth of the groundwater level (GWL) and the depth of soil freezing. Subtract from GWL freezing depth and obtain the groundwater level below the freezing depth (Z value in the table). Compare with the table values ​​in your soil column. For example, 1.2 m in the obtained clayey ground - index Z <1,5, that is ground with a high relative silnopuchinisty strain> 0.07 (7%). Pillars in a soil with improper installation can lift more than ten centimeters every winter.

In the calculations, you should use the pre-winter groundwater levels (measured not earlier than August), but for reassurance heaving better determined by the maximum seasonal water table, advises forumchanin al185. It should also be understood that a separate calculation is approximate and to strongly not to make a mistake, start from the "worst" performance.

One common control options frost heaving - penetration pillars fence below the freezing depth. Thus on the heel post will not put pressure below the frozen soil expanding.

But fundamentally it does not solve the problem: the seasonal freezing of soil heaving significant lateral forces that put pressure on the pole at a tangent. Simple concreting case also did not help, it will only increase the force application area and the post will be pressed together with a concrete "skirt." To reduce the swelling of the tangent, some forum users concreted poles, placing them in the pocket of tar paper or plastic pipes. Under the heel post poured drainage bed of rubble, which must necessarily be below the freezing depth.

welser(Member FORUMHOUSE):

- With 0.25 m in well diameter shirt set of roofing material, poured into 1.5 gravel bucket inserted post (70 ka, profiled tube), filled with concrete up to the edge ruberoidnyj shirt. Everything costs, no swelling.

Many, however, consider pouring concrete, even deeply buried posts on heaving soils too risky and costly and time consuming option. And prefer instead to backfill pillars unaffected by heave materials - sand and gravel, gravel, coarse sand.

Igor Kokhanov (Member FORUMHOUSE):

- dig holes on 1,5metra, to the pillars - and gravel mixed with sand rammed. Earlier fence with concreted pillars was wave. New fence winter survived and stands after thawing of soil, as a string. The soils have a very distending.

When backfilling forum users are also often used the sleeve of the roofing material and geotextile-for insulation filling of soil. The best option, the user finds SidorD If between the sleeve and the wall of the well will be the same sand and gravel layer.

SidorD(Member FORUMHOUSE):

- Over time, any smooth surface silted up and still makes contact with the ground. Nepuchinistyh layer of materials solve the problem, it does not provide a ground to pull the pillar when heaving: at low bulk material adhesion between the layers, ie,.. on the edges of the liner the ground rises, and in the center, where there is a post, remains in place.

Plus, this method is also the fact that, if due to incorrect calculations of the fence still "lead" to remedy the situation will be easier than in the case with concrete pillars. However, many worried that without a concrete fence can turn out not too stable. Forumchan Experience shows that the qualitative, layer by layer, by pouring a water filling ramming mixture of sand and crushed stone around the post provides a monolithic mass without voids and post it will stay hard. Again, slightly lopsided support can be in a matter of minutes to correct and strengthen using scrap bucket and gravel.

User Groundworkturf Tip To minimize wind loads to strengthen further concrete pillars zabutovany "caps."

Groundworkturf(Member FORUMHOUSE):

- Before drilling hole pillars dig a pit square 0,4h0,4 m depth of 30 cm (up loam), and then the keeper hole for the pole; install it, butite gravel to clay loam. Blanketed square geotextile pit and fall asleep in the same rubble the rammer 20 cm. Installing formwork around the perimeter of the pit and pour the slab 15 cm in height.

Less popular due to higher cost and complexity of the method - the use as supports screw piles with blades at the end of performing the function of the anchor. Screw piles also need to move deep below the soil freezing, or in the winter they also can "squeeze."

The above methods are good for relatively light fences, for example, of profiled sheet or wood. However, embodiments with a deep pillars below the depth of soil freezing approach, of course, not everyone and not always. In some regions, the depth of freezing can reach up to two meters - to drill out a long and troublesome.

Perhaps we should consider the construction of the fence option to not flush support. For example, reliable, but, alas, labor-intensive and expensive way - the construction of a belt or a combination calculated on the foundation bed of nepuchinistyh materials with reinforcement of the blind area, and to protect them from rain and melt water.

Groundworkturf:

- Make the excavation to clay a width twice the foundation tape. Flare bed geotextile and make backfilling with sand rammer 10 cm and 30 cm rubble. Then cast tape mounted racks fence.

User al185 found that its soil srednepuchinistogo practical to build a fence on the unburied supports (concrete soles) with additional thermal insulation. According to him, between the pillar and the sole buried in heaving soils there is a fundamental difference: the soles every year sits on the seat, and the column with bulging accumulates each year. Warming is especially important on the pillars of the gate - this area is cleared of snow in winter, and therefore less protected from freezing.

For the manufacture of soles for linear forumchanin fence poles aligned on a base set of formwork boards 100 mm. It installed in plumb tube legs. Poured concrete layer 3 cm, put several cross bars of 4 mm and then filled with concrete to the top.

al185(Member FORUMHOUSE):

- Under the gate is filled w / w platform 4h1h0,1m with asbestos cement pipes, surrounded by fieldstone. Under it - 100 mm foam PSB-25. Fence posts of asbestos cement pipe embedded in the sole of rhombic 1h0,5h0,1m, buried 15 cm. Meaning the foam under the linear columns do not see the snow heave does not exceed 1-2 cm. Sam fence - horizontal boards 25h150 overlap. 80 m fence defended two winters and two springs with squalls. Fences with neighbors on stone plinths curves.

If as a result of miscalculation or wrongly chosen technology fence still led, the problem can try to solve the insulation of the foundation or supports, according Val7676 user. According to him, it will be cheaper and easier entrenchment of each column of soil sampling and replacement around him nepuchinisty.

Val7676(Member FORUMHOUSE):

- from the fence near where nobody goes and cleans snow, problems hardly arise. Events on warming - a lack of snow in the compensator Gates (ie where it is not), in order to align it with the freezing of the soil columns located under the snow. Thus poles can be installed and the fill and the concrete, and other methods.

Experience in construction and installation of pillars and foundations for different types of fences are divided Gameday this section.Here and here - Discussion of options for the construction of the fence on the heaving soils and ways of dealing with frosty heaving. On the experience of the construction of foundations in marshy soils described in this video.

Discuss the article and read other materials devoted to country life you can on the websiteFORUMHOUSE.

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