SU1206397A1 - Pile foundation - Google Patents

Description

The invention relates to the construction, in particular to the structures of the pile foundations erected in the undermined areas, as well as in complex engineering and geological conditions, accompanied by uneven precipitation of foundations.

The purpose of the invention is to increase the bearing capacity of the foundation and to ensure its regulation during the construction, operation and undermining of the foundation during operation.

FIG. 1 shows a fragment of the foundation, section; in fig. 2 is a view A of FIG. one; in fig. 3 is a view B in FIG. 2; in fig. 4 shows a section B-B in FIG. 2; in fig. 5 is a section of YYD in FIG. 2; in fig. 6 - fragment of the pile foundation, section (after the base has been compressed by the bottom plate of the grillage).

The pile foundation, erected on the foundation 1 that is being mined, contains a composite of height from the lower team 2 and the upper monolithic 3 parts, placed with a gap 4 relative to one another, the grillage and piles 5, rigidly connected to the upper part 3 of the grillage and equipped with a thixotropic jacket 6 on the depth of the active zone of the subsidence of the base 1. The grillage parts 1 and 3 facing one another are made with alternating protrusions 7 and 8, respectively, and notches 9 and 10, respectively, with the protrusions of one part of the grillage partially put in the corresponding notches of the other part, and the gap 4 is formed between the end surfaces of each protrusion and the corresponding notch, and in each notch 9 formed in the lower part of the grillage, a spacer is installed, made in the form of a cylinder 11 of elastic material connected by a 12 sec. source of working medium, such as compressed air (not shown). The notches 10 formed in the upper part of the grillage are limited to removable metal plates 13 attached to the upper part 3 of the grillage by bolts 14, and the notches 9 formed in the lower part 2 of the grillage are limited from one end to the wall 15 of the upper part 3 of the grillage, and from the other end - metal perforated plate 16 with pipe 17.

Between the end surfaces of the protrusions 7 formed in the lower part 2 of the grillage, and the recesses 10 formed in the upper part 3 of the grillage, there is a layer of lubricant 18.

The installation of the pile foundation is carried out as follows.

In the soil base 1 in the underdeveloped area, wells are drilled (not shown) to the core depth of the soil from swathing with a grillage, the wells are filled with the material of the thixotropic scissors 6 and pile pins 5 are driven into the wells of the soil. grillage having protrusions 7 and notches 9. The end surfaces of the protrusions 7 are covered with a layer of lubricant 18. Above the lower part 2 of the grillage with a gap of 4, the upper part 3 of the grillage is concrete, so that the pile heads 5 and the projections 7 of the lower part 2 grow pka set out in the formwork (not shown) of the upper part 3 grillage.

After the concrete has hardened into the grooves 9 formed in the lower part 2 of the grillage, cylinders 11 are made of elastic material, metal pads 13 are installed, attached to the upper part 3 of the grillage by bolts 14. The notches 10 formed in the upper part 3 of the grillage are metal perforated plates 16, attached to the welding of the mortgage parts (not shown), the upper part 3 of the grillage. The fitting 12 of each cylinder 11 is connected to a source of working medium and the base is compressed by the bottom part 2 of the grillage with the help of an adjustable supply of working medium (compressed air) to the cylinders 11. After the soil is compressed, the branch pipe 17 is connected to the source of water-sand mixture (until 5 zan) and the filling material is injected into the gap formed after the soil has been compressed in the recesses 10 above the ends of the projections 7 of the lower part 2 of the grillage. Water is squeezed out through the perforations.

The plates are 16, and sand plugs 19 are formed in the recesses 10.

Metal plates 13 and cylinders 11 may be used successively in the construction of the following sections of the foundation. When the territory is undermined or reduced, the scientific research institute of the carrying capacity of piles, caused by other reasons, at the stage of operation of the structure, in the same order, additional regulating soil compression by the lower parts of the grillage can be performed.

B, G, T-C G G 1 I I

II I

View and

MI I I

FIG. 2

Bb

Yr

FiaM

FIG. five

6

Compiled by V. Gonik

Editor O. GolovachTekhred I. VeresKorrektor A. Zimokosov

Order 8663/31 Circulation 642 Subscription

VNIIPI USSR State Office

Inventions and discoveries

113035, Moscow, Zh-35, Raushsk nab. 4/5

Branch PPP "Patent, Uzhgorod, st. Project, 4

Claims (1)

PILED FOUNDATION, comprising a height component of the upper and lower parts placed with a gap relative to one another, the grillage, piles rigidly connected to the upper part of the grillage, spacers located in the gap between the parts of the grillage, and filling material, characterized in that, with In order to increase the bearing capacity of the foundation and to ensure the possibility of its regulation during the construction, operation and underworking of the foundation during operation, facing one another surface of the grillage parts with alternating protrusions and recesses, and the protrusions of one part of the grillage are partially brought into the corresponding recesses of the other part, and the gap is formed between the end surfaces of the protrusions and recesses, and each expansion device is made in the form of a container of elastic material connected to the source of the working medium, and installed in the corresponding recess in the lower part of the grillage, and a water-sand mixture was used as the filling material, the filling material being located in the recesses formed in the upper parts of the grillage, and the upper part of the piles to the depth of the active zone of subsidence G of the base is equipped with a thixotropic shirt. V u about 05 with>