RU2276709C1 - Foundation widening method - Google Patents

Abstract

FIELD: building, particularly to increase load-bearing foundation ability during building repair and reconstruction.

SUBSTANCE: method involves digging-out trench in several sections for depth equal to widening member installation depth and depressing the widening members under foundation bed, wherein the widening members are pairs of blocks made as wedges provided with depressions, which are serially depressed under foundation bed with the use of jack lowered in trench; placing metal rod adapted for horizontal widening members connection in depression; fastening reinforcing net to side foundation surface; inserting lower part of reinforcing net in depression; grouting the net and filling the depression with cement mortar.

EFFECT: increased simplicity and possibility of operations performing from outer building sides.

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Description

The invention relates to construction and can be used to increase the bearing capacity of foundations in the repair and reconstruction of buildings.

Known methods of broadening the soles for the strip foundation, including the device of reinforced concrete cage (see Polishchuk A.I. Design fundamentals and the foundation of reconstructed buildings. Northampton - Tomsk 2004, p.302 scheme 1, the device tides of concrete, s.304 scheme 2, arrangement of additional pads made of reinforced concrete, p.306 scheme 3, etc.).

The disadvantages of the above schemes are the need to work on both sides of the foundation, which in some cases causes difficulty, and the difficulty of ensuring the inclusion of broadening sections in the work, based on unconsolidated base soil.

Known methods of broadening with the creation of tension at the base of the "unloading" elements by squeezing the soil (see A. Polishchuk. Fundamentals of design and construction of foundations of reconstructed buildings. P.388, by installing membrane spacers p. 392, installing hydraulic jacks p. 398 and others).

There is a method of reinforcing foundations, including extracting sections of the trench to the depth of installation of the reinforcing elements, bringing under the pillow the foundations of the reinforcing elements by pressing (see patent RU 2164982 C1, E 02 D 27/08, 04/10/2001), which is adopted as the closest analogue to the claimed invention.

The technical solution to the problem is to simplify the process of broadening the foundation and ensuring work from the outside of the building.

This object is achieved in that the method of broadening the foundation includes extracting sections of the trench to the depth of installation of the broadening elements, pushing under the base of the foundation a pair of blocks in the form of wedges with a niche that are successively pressed under the base of the foundation using a jack lowered into the trench, and a metal rod is placed in the niche for fastenings in the longitudinal direction of the broadening elements, attach the reinforcing mesh to the side surface of the foundation, lower the bottom of the reinforcing mesh into the niche, plaster e and fill a niche with cement mortar.

The novelty of the proposed proposal is due to the fact that due to the shape of the pressed-in separate blocks, the soil of the base is compacted under the parts of the broadening of the foundation, and the method of performing the work provides a connection between the elements.

The invention is illustrated by drawings, where figure 1 shows a section of a wall after increasing the width of the foundation. To broaden the foundation 1, after pressing the first 2 and second 3 blocks, the metal element 4 connecting the length of the blocks is laid in a niche 5, the side surface 1 is reinforced with reinforcing mesh 6 held by pins 7, and plastered with cement mortar 8, which also fills the niche 5 in block 3. Figure 2 shows the plans (top view) of blocks 2 and 3.

The implementation of the method of broadening the foundation is carried out in the following sequence: from the outside of the building along the foundation 1, trench 9 is torn off in sections of 1-1.5 m to the depth of installation of the foundation broadening elements of such a width as to accommodate the broadening block 2, the jack 10 and the stop 11. The gate is dug out 12 under the bottom of the foundation 1 in order to push there and orient the movement of block 2 when it is pressed by the jack 10. After block 2 occupies the design position, block 3 is pressed under it, wedging and compacting the base soil . The operations are repeated, passing to the neighboring section of the foundation. After the broadening will be carried out along the entire contour of the building, a metal element 4 is placed in the niche 5 of the block 3. The cleaned side surface of the foundation 1 is reinforced with reinforcing mesh 6, fastening it with pins 7, and plastered with cement mortar, filling a niche with them 5. Then the trench is filled with soil with compaction and blind.

Claims (1)

A method of broadening the foundation, including extracting sections of the trench to the depth of installation of the broadening elements and pressing them under the pillow of the foundation, characterized in that pairs of blocks are used as broadening elements in the form of wedges with niches that are successively pressed under the pillow of the foundation using a jack lowered into the trench, they put a metal rod in a niche for fastening in the longitudinal direction of the broadening elements, attach a reinforcing mesh to the side surface of the foundation, lower the bottom of the reinforcing nets into a niche, plaster it and fill the niche with cement mortar.

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