SU1430463A1 - Method of constructing cast-in-place piles - Google Patents

Abstract

The invention relates to the construction and can be used in the construction of pile foundations. The aim of the invention is to increase the bearing capacity and reliability of the pile. The method involves the formation of a well 1, into which the reinforcing cage 2 is lowered and the well is filled with concrete mix 3. After the formation of the stem 4 around it, an annular cavity 5 is formed to a depth of transient or swelling stratum 6, in KOTopyiJ the soil and the trunk, the protective sheath 7, after which the gaps are filled with a water-ground mixture 8 to a height of 9 equal to the difference in the height of the subsiding or swelling soil and the length 1 of the bend of the pile 4, which is 10Fe of the ratio 20d: VKd, where K. is the coefficient of proportionality, 1 / m taken depending on the type of soil, d is the outer diameter of the pile, m. After that, a cylindrical yoke 10 with a length equal to the length of the 4 pile , and then filled with a hardening mixture 11 the gaps between the yoke and the ground and between the barrel and the yoke. 1 -il. (g (L

Description

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The invention relates to the construction and can be used.

 during the construction of pile foundations. The aim of the invention is to increase the carrying capacity and reliability.

The drawing shows the stages of construction of a bored pile.

i The method involves the formation of a bore 1, into which the reinforcement cage 2 is lowered and the well is filled with concrete 3. After the formation of the trunk 4 around it

I annular cavity 5 to the depth of the shrinkage or swelling soil around the soil 6, into which the protective layer of the soil and protective layer 7 is installed with gaps, then the gaps are filled with a water-soil mixture 8 to a height of 9 equal to the difference in the height of the subsidence or swelling soil thickness and length 1 of the bend of the pile 4 pile, which is determined from the ratio

j where K is the proportionality coefficient 1 / m, taken depending on the type of soil} d is the outer diameter of the pile, m, after which a cylindrical yoke 10 with a length equal to the length of the bend of the pile 4 is installed between the pile 4 and the shell 7, and then The gaps between the cage and the ground and between the barrel and the cage are filled with a hardening mixture 11.

An increase in the load bearing capacity of the I pile is approximately 15-28%.

The application of the proposed method will allow: to increase the reliability, ensure the integrity and continuity of the protective sheath when installing it into the cavity filled around the pile; simplify the technology and reduce the complexity in the manufacture and installation of the containment shell; increase the pile carrying capacity by eliminating to a large extent negative friction, due to the presence of a cylindrical cage between the pile shaft and the shell, in addition to the flexible shell of the cavity filled with water-ground mixture, to provide the pile bearing capacity for horizontal and moment loads by filling gaps in the upper part of the cavity with hardening

Q target.

The use of the invention will make it possible to simplify the device of the containment shell, to apply cheap materials widely used by the domestic industry.

Formula of Invention

The method of construction of bored Q piles, mainly in subsiding or swelling soils, including drilling a well, installing a flexible protective sheath and forming a trunk by placing concrete, is about 5 times that, in order to increase the bearing capacity and reliability, after the formation of the trunk around it, an annular cavity is formed to the depth of the subsiding or swelling thickness of the soil, into which the pieces with gaps relative to the walls of the soil and the trunk are fitted with a protective sheath, after which the gaps of the water-soil mixture are filled IU to a height equal to the difference in height 5 of the subsidence or swelling thickness of the soil and the length of the bend of the pile, which is determined from the ratio

0

40

1 / and

20d

to

where K - coefficient of proportionality, 1 / m, taken depending on the type of soil,

d is the outer diameter of the pile, m, after which a cylindrical yoke with a length equal to the bending length of the pile is installed between the pile shaft and the shell, and then filled with a hardening

a mixture of clearances between the sleeve and the ground and between the barrel and the sleeve.

VNIIPI Order 5306/26

Random polygons pr-tie, Uzhgorod, st. Project, 4

Circulation 637

Subscription

Claims (1)

Claim A method of erecting bored piles, mainly in subsidence or swelling soils, including drilling a well, installing a flexible containment and forming a trunk by laying concrete, characterized in that, in order to increase the bearing capacity and reliability, an annular cavity is formed around it to a depth subsidence or swelling strata of the soil, in which a protective shell is installed with gaps relative to the walls of the soil and the trunk, after which the gaps are filled with a water-soil mixture OTU equal to the difference of height or subsidence of soil strata and swellable 1izgiba pile length which is determined from the relation, _ 20d · * · Μ S, ------ » VKd ² where K is the coefficient of proportionality, 1 / m ² , taken depending on the type of soil, d is the outer diameter of the pile, m, after which a cylindrical sleeve is installed between the pile shaft and the sheath, equal to the length of the bend of the pile, and then filled with a hardening mixture Clearances between the holder and the ground and between the barrel and the holder. VNIIIPI Order 5306/26 _______ Circulation 637 ______ Subscription Custom polygr. ave, city of Uzhhorod, st. Project, 4