RU2056478C1 - Method for reinforcing bases and foundations on sagging ground in hindered conditions - Google Patents

Abstract

FIELD: civil engineering. SUBSTANCE: areaway is dug adjacent to the foundation to be reinforced on the side of its sagging. Cavity of trapezoidal shape is originated from the areaway bottom. Reinforcing bars are installed over all processing pit and cavity, then it is filled with consolidating material to form pile shaft with cantilever. EFFECT: reinforced foundation and base. 3 cl, 1 dwg

Description

 The invention relates to construction, and in particular to a method for strengthening the foundations and foundations of deformable buildings and structures.

A known method of reducing the deformation of a structure, including the injection of hardening material under the supporting part of the structure, placed on a soil base [1]
The closest technical solution to the invention is a method for stabilization and elevation of the foundation structure, including removing soil from a vertical pit next to an expandable foundation, forming a cavity under the foundation, installing reinforcement and supplying hardening material with the formation of a pile shaft with a cantilever, forming a concrete well in the soil below piles and injection under high pressure of plastic material into the cavity between the concrete well and the pile. The stabilization of the position of the foundation is achieved by creating an increased support at the base of the pile [2]
The disadvantage of these methods is their low efficiency.

 The purpose of the invention is to increase the efficiency of reinforcing bases and foundations on subsiding soils in cramped conditions.

The goal is achieved in that near to settling foundation developed a vertical pit, a supporting part settling foundation produced cavity trapezoidal shape in cross-section, wherein the bearing surface of the cavity is performed at an angle of ⁴⁵ ° is produced forming the trunk and the console by setting the valve in the hole and a cavity; filling them with hardening material, while the console uses expanding hardening material, and the thickness of subsidence soil from the bottom of the pit to a hard sandy or coarse soil layer is taken no more than six pit diameters.

 The drawing shows a section of a pit with a single-console pile.

 The method is as follows.

On the subsidence side of the reinforced foundation 1, brought under the walls 2 of the building, a pit 3 is made for the performance of work. Under the foundation, a cavity is produced that is trapezoidal in cross section with a height of A = 1/2 (B _f + V _st ) and bases: C = 0.4-0.5 m and B = 1/2 (V _f + V _st ) + (0.4-0.5) m, where B _f and B _st respectively the dimensions of the foundation and wall. From the bottom of the pit, a vertical pit 4 is developed with a diameter of at least 0.6 m and to a depth at which the thickness of subsidence h from the bottom of the pit to a hard sandy or coarse-grained layer 5 is no more than six pit diameters. An increase in the thickness of subsidence soil h> 6 V in the _trunk will lead to subsidence deformations and, as a result, to pile upsetting.

 In the pit, as well as in the volume cavity under the supporting part of the settling foundation, steel fittings 6 and 7 are installed, welded at the installation site.

 Further, the entire volume of the pit and the volume cavity is filled with hardening material, for example concrete, with the formation of a pile shaft with a console, and an expanding hardening material is used for the console. The use of expanding hardening material allows, firstly, to eliminate all available gaps between the supporting parts of the structure of the cantilever piles and the ground; secondly, the redistributor of the loads transferred by the foundation in the soil base. The length of the pile is determined depending on the degree of compliance of the soil, which is very important when reinforcing individual parts of a building or structure.

 Strengthening the base and foundations is achieved by transferring the console pressure to the ground and supporting the piles through the compacted soil, below the bottom, onto the bearing layer.

 The application of the proposed method in practice allows to increase the efficiency of strengthening the foundations and foundations of deformable buildings and structures on subsidence soils in cramped conditions, since work does not require a large area, as well as special mechanisms.

 The economic efficiency of the invention is to reduce the cost of the work of strengthening the foundations and foundations, the possibility of producing work by unskilled workers and uncomplicated method technology.

Claims (3)

1. METHOD FOR STRENGTHENING THE FOUNDATIONS AND FOUNDATIONS ON SILLING SOILS IN CONFINED CONDITIONS, including the development of a vertical pit near the reinforced foundation from the side of its subsidence, the formation of a cavity adjacent to the pit under the supporting part of the settling foundation, and the formation of the pit and the cavity from the trunk from the trunk, respectively, from the trunk installation of reinforcement and supply of hardening material into the pit and cavity, characterized in that the formation of a cavity under the supporting part of the settling foundation is made from a previously developed iyamka, wherein the cavity operate trapezoidal shape in cross section with a height of A = 1/2 (B + B _{f s t)} and bases C = 0,4 - 0,5 m and B = 1/2 (B _f + B _{with t} ) + (0.4 - 0.5) m, where B _f and B _{with t} are the dimensions of the foundation and wall, respectively, and a vertical pit is developed from the bottom of the pit, and the pit is made with a diameter of at least 0.6 m.  2. The method according to p. 1, characterized in that the vertical pit is performed to a depth at which the thickness of the subsidence soil from the bottom of the pit to the hard sand or coarse layer is not more than 6 pit diameters.  3. The method according to p. 1, characterized in that the console piles are made of expanding hardening material.

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