RU29537U1 - Support of lightly loaded foundations - Google Patents

Abstract

The support of lightly loaded foundations, including a base plate and a pillow, characterized in that the pillow is laid with a seal of non-porous, low deformable material to a depth of greater freezing depth, and the base plate is made with a blind area around it.

Description

Support of lightly loaded foundations

The utility model relates to supports created in various ways and can be used to increase the effectiveness of foundations for the perception of small loads.

For the construction of foundations, it is often effective to use intermittent foundations combined by a grillage to ensure their joint operation. Attracting a variety of machines and mechanisms imposes a limitation on their scope. The use of traditional foundations is time-consuming and inefficient and, moreover, with an increasing volume of construction in difficult engineering and geological conditions, a complicated process. Significant limitations on the design imposes a possible seismic impact.

Small-sized equipment, which in some cases can solve the problem of construction in cramped conditions, is not widespread. In addition, the resulting impact on the surrounding buildings and structures may be a restriction in use, as well as the installation of traditional pits and trenches.

It is known the device foundations in rammed pits (AS 909096), providing compaction of the soil of the base around it.

MPKE02027 / 01, 27/26 The closest technical solution is

design of a dry friction damper, consisting of a laying of bulk material 100 mm high, with a mesh preventing shear, and a working body in the form of a reinforced concrete block (see Experimental study of dry friction damper / Construction in special conditions. Earthquake-resistant construction. M., VNIIIS, 1981) .-Issue 6.- S. 16-20.).

However, this design requires additional measures, in particular, the creation of the lower part of the damper, which is an independent design, which increases the cost and complexity of the solution.

The essence of the utility model is that the support of lightly loaded foundations, consisting of a base plate and a pillow, arranged by laying with a seal of non-porous, low deformable material to a depth of a large depth of freezing, with preliminary excavation of local soil, and the base plate is made with a blind area around it.

The essence of the utility model is illustrated in the drawing, where the section of the support is given.

The model consists of a base plate 1, a pillow 3 arranged in local soil 4, and a blind area 2.

When a load is applied, the greatest vertical compressive stresses are concentrated in the poorly deformed pillow 3, while the calculated

2.

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soil resistance at the sole of the base plate 1 and the roof of soft soil at the border of the pillow - local soil are performed in the vast majority of cases. Soil replacement, therefore, appears to be an improvement in the construction properties of the foundation foundation. The influence of freezing-thawing processes is excluded by laying a pillow 3 of more depth of seasonal freezing and non-porousness of the material itself. When combining the supports, a constructive gap is required between the grillage and the ground level with the height of the greater rise of the soil under the action of frost heaving forces. The size of the base plate 1 a is determined depending on the design requirements, the value of the applied load, the height of the cushion 3 and the physical and mechanical characteristics of the local soil 4. The size of the cushion b depends on the latter. The blind area 2, the design of which corresponds to standard solutions, prevents soaking from top to bottom. During construction in seismic areas, the design has the advantage of seismic insulating properties, which is confirmed

experimental data. The absence of viscous friction on the surface of the reinforced concrete slab-pillow when exposed to horizontal forces leads to a significant reduction in the additional forces arising in the aboveground part.

The proposed design allows you to arrange foundations for detached, strip or solid above-ground structures without special equipment in cramped and complex

engineering-geological conditions, possible seismic impact, and lowers the material consumption of the underground part of the building.

Claims (1)

The support of lightly loaded foundations, including a base plate and a pillow, characterized in that the pillow is laid with a seal of non-porous, low deformable material to a depth of greater freezing depth, and the base plate is made with a blind area around it.