SU896188A1 - Method of constructing pile foundation in sagging and bulging soils - Google Patents

Description

(54) METHOD FOR CONSTRUCTING PILED FOUNDATION IN TRANSITION AND SOOTHING SOILS

I

The invention relates to the construction, and in particular to methods for erecting pile foundations, mainly in soils of subsidence II and swelling.

There is a method of erecting pile foundations, which includes installation of piles into leading wells drilled in subsurface soils with a diameter less than the cross section of piles, pouring wells with water and sinking the piles to the design mark 1.

This method is aimed at reducing friction forces along the lateral surface of the pile when it is immersed, but it does not protect the pile from the effects of negative friction forces when soaking the soil and the appearance of subsidence in the circulating space.

The closest to the proposed technical essence and the achieved result is a method of erecting a pile foundation in subsiding and swelling soils, including the formation of wells with a diameter exceeding the diameter of piles and immersion in them of the trunks, followed by filling the gap between the walls of each well and the barrel with filling material 2 .

The disadvantage of this method is the difficulty of performing work in conditions of soil type II subsidence and swelling, as well as the possibility of soaking soils during operation.

The purpose of the invention is to simplify the production of work in conditions of soil type II subsidence and swelling, underlying drainage soils.

This goal is achieved by the fact that in the method of erection of a pile foundation

.- in subsiding and swelling soils, including the formation of wells with a diameter exceeding the diameter of the piles and immersion in them of the trunks with the subsequent filling of the gap between the walls of each well and the trunk

15, each well is made with a diameter greater than 1.2-3 times the diameter of the pile shaft and dredges it into the underlying drainage layer of the soil to a depth not less than the diameter of the well, and the gap between the walls of each well

Claims (2)

20 and the barrel is filled with drainage material. At the same time, after filling the gaps between the walls of the wells and the trunks of the draining material on the soil surface, a layer of drainage material underlain by a film of water-wetting material can form with the filling material, the bottom surface of which is inclined towards the wells. The drawing shows the pile, erected in the described manner, the cut. The method is carried out as follows. In subsurface soil 1, a well 2 is formed by drilling, blasting, etc. using methods, and well 2 is sunk into the underlying drainage layer of soil 3 to a depth not less than the diameter of the well. Then, the pile shaft is dug into the borehole 2 with its lower end supported in the underlying drainage layer of the soil 3, after which the gap between the wall of the borehole 2 and the pile shaft 4 is filled with drainage material 5 (for example, gravel, crushed stone, coarse sand, etc.) P.). Then, a drainage layer b is arranged on the surface of the ground, the base of which has a slope towards the borehole 2 and is separated from the drainage layer by a film 7 of water-impregnated materials. With this method of erecting a pile foundation, water that enters the drainage layer 6 from leaks of water-carrying networks or atmospheric water, moves along film 7, enters the well 2 filled with drainage material, and then is filtered into the underlying drainage layer of the soil 3, it is not moistened with subsidence 1. The proposed method of erecting a pile foundation allows you to prevent soaking of the subsidence soil by draining water into the underlying drainage layer of the soil; eliminate the possibility of negative friction impact on the pile and thereby increase the load bearing capacity of the pile on the vertical load. The proposed method of erecting a pile foundation allows increasing the load bearing capacity of the pile by a vertical load by 1.5–2 times and reducing the cost of pile foundations in subsiding soils of the N type by subsidence by 25–30%. Claims I. Method of erecting a pile foundation in subsiding and swelling soils, including the formation of wells with a diameter exceeding the diameter of the pile trunks and immersing the trunks in them with the subsequent filling of the gap between the walls of each well and the filling material, characterized in that works in conditions of soil type II subsidence and swelling, underlain by drainage soils, each well is made with a diameter greater than 1.2–3 times the diameter of the pile shaft and dredged it into the underlying drainage layer of the soil to a depth ne less than the diameter of the well, and the gap between the walls of each well and the barrel is filled with drainage material. 2. A method according to claim 1, characterized in that after filling the gaps between the walls of the wells and the trunks, the drainage material on the ground surface forms a layer of drainage material, underlain by a film of non-wetting base material, the bottom surface of which is made with deviation in the direction of the well. Sources of information taken into account during the examination 1. D. A. Romanov et al. Use of light foundations in industrial and mobile construction. Kiev “Budlivnik 1970, p. 131 2. USSR author's certificate for factory No. 2835914 / 29-33, cl. E 02 D 27/12, 1969. a2-h) {/