SU996626A1 - Method of constracting a cast-in-place pile - Google Patents

Description

(54) METHOD FOR INCORPORATING PUNCH PILED

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The invention relates to the construction, in particular to the manufacture of stuffed piles for the foundations of various structures.

There is a method of erecting concrete piles by feeding and at the same time layer-by-layer ramming of the concrete mixture in a previously arranged well.

This method is time consuming, the pile has a relatively low carrying capacity.

There is also known a method of erection of a ram foundation, including ramming a foundation pit in the ground, filling its lower part with hard concrete or rubble, ramming the latter into the ground and laying concrete into the pit 2.

The disadvantages of this method are the small area of the working surface of the foundation, a slight spread in depth, which limits the carrying capacity, as well as greater labor intensity.

The closest to the invention to the technical essence and the achieved result is a method of erection of a ramming pile, including the formation of a leader well, the laying of the concrete mix and its sealing by repeated sinking of the pneumatic punch with its subsequent extraction and filling the cavity formed by it with the concrete mix 3.

The disadvantages of this method are a significant consumption of materials, as well as the fact that the piles made by this method have a low specific carrying capacity, since the carrying capacity of the surrounding soil is used inefficiently.

The purpose of the invention is to reduce the material capacity and increase the bearing capacity of the pile by using the carrying capacity of the surrounding soil.

This goal is achieved by the fact that according to the method of erection of a stuffed pile, 15 including the formation of a leader well. the concrete mix and its consolidation by repeated immersion of a pneumatic punch with its subsequent extraction and filling the cavity formed by it with concrete, the leader well is punched with a pneumatic punch, and the concrete is laid only in the lower part of the leader well, after which a pneumatic punch with a larger diameter is broken unfilled

the concrete mixture of the part of the leader well and the compaction of the laid concrete mixture, remove the pneumatic punch and put the concrete mix into the lower part of the expanded well, and the operations for expanding the well and compaction of the laid mixture are repeated using pneumatic punches of increasing diameter.

FIG. 1 shows a lead hole formed by a pneumatic punch; in fig. 2 - the same, with the concrete mix laid in its lower part; in fig. 3 - expansion of the upper part of the leader well with a larger diameter pneumoproof; in fig. 4 - the same, with the concrete mix laid in the lower part of the expanded well; in fig. 5 - re-expansion of the well by pneumatic punch of increased diameter compared with the previous one; in fig. 6 - pile, manufactured by the proposed method.

The method of erection of a stuffed pile is carried out as follows.

The reversible pneumatic punch 1 arranges the leader bore 2 with compacted walls and bottom 3. The leader bore is partially filled with concrete 4. The same punch equipped with an expander or pneumatic punch of a larger diameter 5, unfilled with concrete, part of the well is expanded and simultaneously tamped with the previously laid concrete . Part of the mixture 6 is pressed into the soil of the walls of the well, forming a step. The broadened portion of the well is partially filled with concrete mix 4, which is compacted during the next expansion of the well by a pneumatic punch with a larger diameter 7. As a result, a step ladder 8 is formed in the punctured well.

The development of the pile pile due to the formation of steps and the improvement of the building qualities of near-soil soil by compacting and ramming part of the concrete mix in the area of the step provides a significant increase in the pile bearing capacity.

The method allows staging steps at any level along the pile shaft, which makes it possible to maximize the use of those

cut layers of soil that have the best physico-mechanical characteristics. In addition, the method allows arranging piles in subsiding soils, since compaction of the near-soil soil eliminates its subsidence properties.

Claims (3)

1. USSR author's certificate No. 614166, cl. E 02 D 5/38, 1978. 2. USSR author's certificate number 699105, cl. E 02 D 27/32, 1979. 3. For the UK of UK No. 1500835, cl. E 1 H, pub. 1978 (prototype). rw Csx .- Ifue.l Fig.d I G5G. FIG.