SU827692A1 - Method of providing foundation under existing buildings and structures - Google Patents

Description

one

The invention relates to the field of construction, in particular, to methods for strengthening the foundations of existing buildings and structures.

There is a known method of laying the foundation for existing buildings or structures by extracting a pit and sinking from it under the existing foundation of horizontal excavation followed by immersion of piles from it 1.

This method is material and labor intensive. In addition, it does not exclude the occurrence of additional sedimentation of existing buildings or structures during work.

The closest to the invention is a method of laying the foundation for existing buildings and structures by extracting the excavation pit and penetrating horizontal excavation from it by forcing hollow sections out of it while simultaneously removing soil from the cavity and subsequently sinking pile from it.

, 2.

The disadvantage of this method of laying the foundation is the high consumption of materials and labor costs, especially when the bedrock is located at great depths. In these cases, the immersed piles usually work as hanging, which does not allow

make full use of their material carrying capacity. In addition, the horizontal development does not take the loads from the foundation, and is

technological element, which causes an increased consumption of materials.

The aim of the invention is to reduce material consumption and labor intensity in the production of works.

This is achieved by the fact that, according to the method of laying the foundation for existing buildings or structures, by extracting the excavation pit and sinking from it under the existing foundation of the horizontal excavation, the horizontal excavation is formed by the depth of the active zone of compression of the soil under the foundation upwards before connecting them to the sole foundation.

FIG. 1 shows a longitudinal section.

excavation and horizontal development; on

FIG. 2 - cross section of the failed

foundation.

The laying of the foundation for existing buildings or structures by the proposed method is carried out as follows.

Around the existing base 1 tear off the pit 2 in the fence 3. Hollow

sections 4 are fed into the pit 2 and are pressed into the jacks 5 below the depth of the core 6 for compressing the soil. As the sections are pressed, the soil in the bottomhole is developed and removed. After the formation of the horizontal excavation, the piles 7 are fed into it. At the locations of the piles 7 in the upper part of the hollow sections 4, holes 8 are made through which the piles 7 are pressed in by short links, joining joints 9 together.

The number of piles is chosen depending on the soil and the required bearing capacity. After the piles 7 are pressed in, the horizontal excavation is filled with concrete, thereby forming a uniform structure. The dimensions of the development are taken from the calculation of the perception of forces from the foundation, the forces of crushing of piles and the pressure of the soil.

The advantage of the proposed method is that after laying the piles under the existing foundation and monolithing their ends in a horizontal mine, the load from the foundation is transferred to the horizontal mine, and the piles work as pile racks, which allows them to fully utilize their bearing capacity over the material and reduce their .

Claims (2)

1. Ganichev I. A. Arrangement of artificial bases and foundations. M., stroiizdat, 1969, p. 268-277, fig. VI.12-VI.14. 2. USSR author's certificate number 386066, cl. E 02D 27/48, 1973 (prototype). A (g, / - hr l --r- i: h: ; g-hhV ° -. °. -, .Ig rm. -H ...... i. -.- t- I. x. Y. -N; Y-X t 1. r iNV, vx vx: y // yxxxy / x 4 / Xvv VAVyX X / X y / V (.... 2