SU1470869A1 - Method of constructing foundation on sagging soils - Google Patents

Abstract

The invention relates to the field of construction, and in particular to methods for building a foundation on subsiding soils of the N type by subsidence. The aim of the invention is to increase the carrying capacity of the erected pile foundation. The method is carried out as follows. In the soil they form wells and form stuffed shafts in them. After the barrel has been set, the strength providing the carrying capacity R at the level of the soil layer, the draft of which is equal to the draft of the trunk from the total force equal to its own weight and the forces of the negative friction, soaks the soil. The carrying capacity R is determined by the above dependence. At the same time, the forces of the loading friction arising during the soaking, acting on the lateral surface of the stems, squeeze them out and create a compacted zone under the sole.

Description

one

The invention relates to the construction, and in particular to methods for constructing foundations from ramming piles for buildings and structures erected on subsurface type I soils.

The purpose of the invention is to increase the nonexistent ability of the pile foundation being built.

The method is carried out as follows.

Arrange stuffed trunks in the wells, made dry. The trunks may have different designs and be performed by various methods, such as drilling, punching, etc., with measures to increase the bearing capacity of the base in the lower part.

trunk (device of broadening, use of driving elements, tamping of hard material, etc.), as well as arranging a wall in the ground.

After the barrel has been set, the strength providing the carrying capacity R at the level of the soil layer, the draft of which is equal to the draft of the trunk from the total force equal to its own weight and the forces of the negative friction, soaks the soil. Bearing capacity R is determined by dependence

R JFu,,

four

O 00 O5

with

cz.)

one -.

Where f ,,, is the function describing linear changes in the forces of negative friction along the lateral surface of the trunk, kN / m;

- Depth of the layer under consideration from the ground surface, m; depth of lay soil, the draft of which is equal to the draft of the trunk from the total force equal to its own weight and the forces of negative friction;

own weight of running about „

meter pile shaft, kN / m.

Soaking can be carried out with a hydraulic explosion, in which case the charges are arranged symmetrically around the piles.

In this case, the forces of loading friction during soaking, and especially during hydroexplosion, load the stuffing barrels along the lateral surface, press them and create a compacted zone underneath the bottom.

After compaction of the filler layer and stabilization of the sediment, the bearing capacity of the compacted base along the lateral surface is determined taking into account the positive values of the friction force.

Immediately after compaction of the soil by wetting or hydroexplosion and stabilization of the soil sediment at least 70% of the calculated value, the site is ready for the device of the glass part, growth

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Claims (1)

Verkov, etc. and subsequent installation work. Invention Formula The method of erection of the foundation on the subsurface soils, including the formation of wells with the formation of the trunk and the subsequent soaking of the soil, characterized in that, with the aim of drilling. bearing capacity of the erected pile foundation, the soaking is performed after the barrel has been set to strength, which provides the bearing capacity R at the level of the rune layer, the sediment of which is equal to the draft of the trunk from the total force equal to its own weight and negative friction forces determined by the dependence R 5%) .l, about where F is the function describing the change in the forces of negative friction along the lateral surface of the trunk, kH / m; Z is the depth of the layer under consideration from the ground surface, m; IQ is the depth of foundation of the soil layer, the draft of which is equal to the draft of the trunk from the total force equal to its own weight and the forces of negative friction; RL - dead weight per meter of a pile shaft, kN / m.