RU2081240C1 - Method for erecting cast-in-place pile - Google Patents

Abstract

FIELD: civil engineering. SUBSTANCE: method includes drilling a well in dust-clay soils, expansion of well by explosion, and filling produced cavity with concrete. EFFECT: higher productivity. 4 dwg

Description

 The invention relates to the construction of pile foundations from bored piles and can be used for their construction in dusty clay soils, which are in a refractory and soft plastic consistency.

 When driving piles, the soil as a result of its displacement from under the tip of the pile compacts the surrounding area. In bored piles this area is absent. Therefore, to increase the bearing capacity of bored piles, additional deep compaction of the bases is performed. The essence of deep compaction is that a sealant is introduced into the foundation soil to a certain depth. This reduces the vapor space around the seal by an amount equal to the volume of the sealant immersed in the ground.

 A known method of compaction of soils by tamping, which consists in the fact that in the compacted mass is punched with a shock projectile wells. The displaced soil moves to the sides and creates a compacted zone around the well, and the well is filled with sand or concrete (1 fig. 103. in p. 322).

 In some cases, vibrators or vibration absorbers are used for deep compaction (1 fig. 104. g p. 324).

 There is a method of erecting a stuffed pile with a base compaction (ed. St. N 1652431, class E 02 D 5/38), which is the formation of a well, filling it with separate layers of soil material and ramming it into the bottom of the well and filling the well with concrete.

 A known method of construction of a stuffed pile (ed. St. N 1606613, class E 02 D 5/34, 5/48, including the formation of a well with an inventory drummer, expanding to the top of the mold, and the formation of the trunk by laying material in the well and compacting it with subsequent by adding.

The disadvantages of the considered methods are:
lack of compaction of the upper part of the soil due to partial bulging of the soil, which necessitates cutting the upper part;
the need to have expensive mechanisms for punching wells;
limited penetration depth;
low productivity, which increases the construction time.

 The intended purpose is a deep compaction with explosion energy (II. Fig. V-7 p. 166), which is carried out from a mark exceeding the foundation mark by at least two meters and is performed by drilling a well to the estimated depth into which the daisy chain charge is lowered EXPLOSIVES, consisting of explosive cartridges tied to a detonating cord. After the explosion, a vertical well is obtained, located in compacted soil.

The disadvantages of this method are
uneven soil compaction along the length of the well:
low explosion energy utilization;
insignificant amount of compacted soil layer around the well, which causes the need to increase the number of piles;
insufficient connection of concrete with the side walls of the well, since the well is a circular cross-section;
the pile has insufficient resistance to horizontal loads.

 The aim of the invention is to increase the bearing capacity of the bored pile by increasing the zone of compaction of the walls of the borehole with a directed blast and creating a curved cross-section of the borehole.

 This goal is achieved by drilling a well, installing an explosive charge in it, blasting it and filling it with concrete, for which an explosive charge is installed in a well along the length of the equilateral corners lowered into the well, the shelves of which are oriented towards the side of the well, and the charges are placed between the corners of the corners .

 In FIG. 1 shows a longitudinal section of a well; figure 2 is a top view of the well with the placement in it of metal with equal angles with explosive charges; figure 3 is a longitudinal section; figure 4 is a top view of the well after the explosion and filling it with concrete.

 In the borehole 1 there are placed isometric metal corners 2 with explosive charges 3 placed between the shelves 4 for a length equal to the depth of the borehole. Side flanges 4 of corners 2 serve as guides of the explosion products towards the walls 5 of well 1 in order to compact the soil and obtain a curved section of the well 5. The resulting cavity is filled with concrete 7.

 The proposed method is implemented in the following way.

 Drill a well 1, in which explosive charges 3 are installed along the length of the isosceles corners 2 lowered into the well, the shelves 4 of which are oriented towards the walls of the 5 well 1. When the shelves of the 4 corners 2 explode, the explosion products are directed towards the walls of the 5 well 1. The directed products expand the well and form a compacted curved cavity in the soil 6. The resulting cavity, formed after the explosion, is filled with concrete.

 The effectiveness of the construction of bored piles is achieved by reducing the number of piles, since piles are built in compacted soils with an increased perimeter of the cross section, which increases their resistance to horizontal movements, as well as by reducing the construction time, since the process of cavity formation and compaction is time-shifted .

Claims (1)

 A method of erecting a bored pile with compaction of the base in dusty clay soils, including drilling a well, expanding it by blasting explosive charges placed throughout the depth of the well, and filling the resulting cavity of the well with concrete, characterized in that the explosive charges set along the lengths of equal-angle angles lowered into the well , the shelves of which are oriented toward the walls of the well, and explosive charges are placed between the shelves of the corners.

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