SU717225A1 - Method of making filling pile in frozen soil - Google Patents

Description

(54) METHOD OF MANUFACTURING A PUNCHED PILED AT PERMAULATED GROUND

I

The invention relates to the field of construction, in particular to the technology of building pile foundations in frozen soils.

There is a method of constructing pile foundations from driven piles in frozen soils 11.

However, frozen soils have a high resistance when piling and therefore piles are often destroyed, which leads to the necessity of doubler pile driving.

There is also known a method for producing a stuffing pile in frozen soil, including drilling a well, thawing frozen soil around it, installing a reinforcement cage, laying concrete into the well, heating it during the hardening period and then freezing thawed soil, which eliminates unproductive consumption of reinforced concrete inherent in clogging method 2.

The disadvantage of this method is the low bearing capacity of the piles, since the soil around it is not compacted.

The purpose of the present invention is to increase the bearing capacity of the pile.

This goal is achieved due to the fact that in the known method of making ramming piles in frozen soil, including drilling a well, thawing frozen soil around it, installing a reinforcement cage, laying concrete into the well, heating it during the period of hardening and subsequent freezing of thawed soil during installation the reinforcement cage along the axis of the well place a flexible cylinder and connect it to an overpressure source, and after placing concrete into the well create an overpressure in a flexible cylinder, which is removed During the hardening of the concrete, after which a cooling device is installed in the cavity, through which the freezing of the soil is carried out.

The method described is illustrated in the drawing. FIG. 1 shows a well located in a thawed soil massif; in fig. 2 - well with reinforcement cage installed; in fig. 3 - well filled with concrete mix, with an established reinforcement cage and a flexible balloon; in fig. 4 well at the time of hardening of the concrete mixture under the action of excess pressure from

, flexible ballon; neither FIG. 5 - freeze-up of the mg of the silo using the ftollieiUeHHoft installation into the cavity formed by the flexible LalbM-2

hardening process.

The method is as follows. In frozen soils drilled well. Around the well, frozen soils are thawed. Thawing of frozen soils can be done either before drilling a well or after drilling. The backlight zone must have a certain size, which is determined by the heat of the technical calculation. .

After installing the reinforcement cage

3 and a flexible cylinder 4, inside of which the pipe 5 with an open lower end is located along the entire length, the well is filled with concrete 6, which is compacted, for example, by a vibratory method. Trumpet

is connected to a source of compressed air 7, for example, a cylinder, and the wellhead is loaded with an annular load 8.

After the compressed air is fed through a pipe into a flexible cylinder, the concrete mixture transfers the pressure to the soil of the ottayanny zone, as a result of which they are compacted. Ring loading is necessary to prevent the concrete mixture from dislodging. The weight of the ring load must correspond to the pressure in the concrete mix. The pressure in the flexible cylinder is determined from the conditions of the desired compaction of the soil of the thawed zone and is maintained during the period of hardening of the concrete mix. Concrete hardening

mixtures during heating and under pressure significantly increases the strength of the bored pile.

At the end of the hardening of the concrete mixture, the pipe is removed and a cooling device, such as a steam-housing installation 10, is placed in the cavity 9.

. At the end of the freezing of the soil from the thawed zone, the cooling device 10

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1

The pile is removed from the body and the cavity is filled with the concrete.

For the development of lateral strength of the pile on the side of the pile, bumps in the seasonal thawing layer, which is known for its technical differences in the anti-shock stabilization (not in the drawing).

The shape of the bored pile, the character of the side surface and provide a high bearing capacity of syaya. Due to this, with the implementation of the described method, a significant economic effect can be obtained.

Claims (2)

1.Posits on the design and installation of pile foundations in areas of plastic-frozen ground. RSN 41-72, Gosstroy RSFSR, Stroyizdat, M., 1972, p. 14. 2. Bases and foundations. Handbook of general construction work. - Stroyizdat, M., 1974, p. 217 (prototype). ig. FIG. 2 FCA (put. 5