A way to enhance the bearing capacity of bored piles

 

The invention relates to the construction of pile foundations of bored piles in silty-clay soils. A way to enhance the bearing capacity of bored piles includes the drilling of wells, installation of an explosive charge, education camouflage cavity and filled with concrete. What's new is that in a well establish a metal cylinder having an annular recess with inclined faces, between which place an explosive charge to the direction of explosion products in the side walls of the well and create a densified annular cavity in the ground. The technical result of the invention consists in increasing the bearing capacity of bored piles. 1 C.p. f-crystals, 2 Il.

The invention relates to the construction of pile foundations of bored piles and can be used during construction in silty-clay soils that are in meters or makoplasty consistency.

When the piling into the ground as a result of its displacement from under the edge of the pile is compacted its surrounding area. In bored piles this area is missing. Therefore, to maximize bored piles spending is her ability piles largely depend on the bearing capacity of soil beneath the lower end of the pile. In some cases, to the bottom of the wells is filled with crushed stone or hard concrete with a thickness of 15-20 cm, which is filled with gouge or vibroshena (Mameluk N. S., Shishko, Century, Soloviev, A. B., against the Georgians centuries Piles and pile foundations, Kiev: “Builder, 1977, S. 204-205, Fig.4-4).

A known method of construction ramming piles seal Foundation (ed.St. No. 165243, 5 E 02 In 5/38), which represents education of a well, filling it separate layers of soil material and trambovaniem it in the bottom of the hole and filling the hole with concrete.

Known way to increase the carrying capacity of the pile due to the increase in the seal area along the length of the piles directional explosion (RF patent No. 2081240), IPC 7 E 21 D 1/00.

Increasing the carrying capacity of the pile reach through education camouflage broadening under the lower end of the pile, using a mechanical Widener, the use of which is possible only in soils meters consistency (Kosterin, E. M. and foundations. M.: Higher school, 1978, S. 164-169, rice.7.22; 7.25).

The disadvantages of the considered methods are:

- the inability to control the quality of work done;

- the use of complex equipment;

- in the presence of weak soils disturbed structure to begin ganitomabuti dewatering.

Closest to the proposed invention is a method of creating a camouflage broadening using the explosion of the explosive charge (Stoll T. M., Telichenko Century. And., Feklin Century. And. the Technology of construction of the underground part of buildings and structures. M.: stroiizdat 1990, S. 172-176, Fig.7.63 (a), including drilling, placement at the bottom of the wells of a concentrated explosive charge. After the explosion at the bottom of the well formed spherical camouflage broadening. The disadvantages of this method are:

- low coefficient of utilization of energy of explosion due to the free exit of the products of the explosion through the hole in the atmosphere, so the soil does not have time to fully form an intense shock wave. Such parameters of shock waves as the maximum pressure on her front and her pulse is insufficient for full compaction of soil Foundation;

- significant seismic impacts in the explosion on the surface, because the charge-centered, not flat;

- if the Central charge does not coincide with the axis of the bore, the spherical camouflage broadening is offset from the axis of the bore, which reduces the bearing capacity of piles;

is complicated by the creation of several of the broadening along the borehole.

The objective of the proposed isomnia on camouflage ening, located along the borehole.

This objective is achieved in that way increase the carrying capacity of bored piles, including the drilling of wells, installation of an explosive charge, education camouflage cavity and filled with concrete, according to the invention in a well establish a metal cylinder having an annular recess with inclined faces, between which place an explosive charge to the direction of explosion products in the side walls of the well and create a densified annular cavity in the ground.

Along the borehole can perform the required number camouflet cavities.

The method of improving bearing capacity of piles in silty-clay soils is illustrated by drawings, where:

in Fig.1 shows a longitudinal section of a cylinder with an explosive charge;

in Fig.2 - arrangement of camouflage cavities along the length of the well.

In well 1, there is a metal cylinder 2 having an annular recess 3 with inclined faces 4, between which is placed an annular explosive charge 5. Side inclined face 4 of the cylinder 2 are directing the products of the explosion in the side wall of the well 1, creating a reinforced annular cavity 6 in the ground 7.

Offers the config between the inclined shelves 4 ring grooves 3, which upon explosion of the charge 5 are directing the products of the explosion in the side wall of the well 1, creating a reinforced annular cavity 6 in the ground 7.

After you create the required number of cavities along the borehole 1 it is filled with concrete 8.

The efficiency of the construction of bored piles is achieved by reducing seismic effects, increasing the bearing capacity of the pile, reducing the number of piles and flow CENTURIES, which allows to increase the load on the Foundation and improve the sustainability of buildings and structures.

Claims

1. A way to enhance the bearing capacity of bored piles, including the drilling of wells, installation of an explosive charge, education camouflage cavity and filled with concrete, characterized in that the well install a metal cylinder having an annular recess with inclined faces, between which place an explosive charge to the direction of explosion products in the side walls of the well and create a densified annular cavity in the ground.

2. The method according to p. 1, characterized in that the length of a borehole perform the required number camouflet cavities.



 

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SUBSTANCE: method involves excavating foundation pits, compacting soil by placing reinforcing members, namely microtunnels filled with hardening material under foundation along the full length thereof. Microtunnels are formed by pushing and compacting soil with the use of cone with through channel moving under base. Hollow tie rod is arranged in cone channel. Hardening material is fed through tie rod into microtunnel formed after the cone. Cone axis is located so that compacted soil boundary adjoins foundation base. Distance between cone axis and foundation base is determined from a given relation.

EFFECT: possibility of soil compaction without welding operation use; increased load bearing capacity of foundation and building structure stability due to increased load-bearing capacity of soil.

2 dwg

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