RU2236508C2 - Connection unit for two-leg eccentrically loaded column with foundation and method for restoring design level of foundation and building frame - Google Patents

Abstract

FIELD: building, particularly to regulate depression of foundation, civil and industrial building frames built on yield ground.

SUBSTANCE: connection unit comprises anchor bolts formed of tubular reinforcement members. Column legs are connected one to another by jack girders. Anchor bolts have ridges extending along screw line. Foundation has central throat expanded downwards and completely filled with granular filler cooperating with foundation bed from foundation bottom. Each column leg is supported by anchor bolts by means of flange nuts connected to flange of corresponding column leg. Each jack girder is connected with piston of double-action pulsating jack rested by jack plate upon granular filler. Method for restoring design foundation level involves installing double-action pulsating jacks under jack girders; supporting plates of double-action pulsating jacks by granular filler of foundation throat; connecting piston of each with jack girder; bringing double-action pulsating jacks into forward trace action for granular filler pressing into throat and under foundation bottom; pushing foundation out of ground; bringing double-action pulsating jacks into return trace action; pulling double-action pulsating jack to jack girder; placing new portion of granular filler under support plate of each double-action pulsating jack; bringing double-action pulsating jacks into forward trace action; pressing granular filler under foundation bottom; pushing foundation out of ground and repeating above operations up to reaching design level of foundation and column; removing jacks and arranging supporting table instead of jacks.

EFFECT: possibility of mechanized restoring of design foundation level; reduced material consumption of connection unit.

2 cl, 5 dwg

Description

The invention relates to the field of construction and can be used to manage precipitation of foundations and frameworks of industrial and civil buildings. The method gives the greatest effect during construction on subsidence soils.

Known node connection columns with the foundation (see Belena EI Metal structures. M: Stroyizdat, 1976, S. 221, 222). The disadvantage of this technical solution is the lack of elements that allow you to straighten the foundation and column after their uneven settlement, the large material consumption of the site.

The closest solution in terms of the set of features and the achieved result in terms of the design to the claimed invention is a unit for coupling a two-branch eccentrically loaded column with a foundation, including anchor bolts (see SU 949098 A, E 04 B 1/38, E 04 C 3/32, 17.08 .1982).

The closest solution in terms of the method is a method of restoring the design elevation of the foundation of a two-branch eccentrically loaded column, the branches of which are connected to each other by jack beams, and the foundation is made with a central nozzle expanding downward, filled with loose aggregate, such as crushed stone (see RU 2123091 C1, E 02 D 27/00, E 02 D 27/50, 12/10/1998).

The objective of the present invention, both in the part of the connection unit of a two-branch eccentrically loaded column, and in the part of the method of restoring the design elevation of the foundation and frame of the building, is to enable the method to be mechanized and to reduce material consumption.

The problem is solved due to the fact that in the junction of a two-branch eccentrically loaded column with a foundation including anchor bolts, according to the invention, the column branches are connected to each other by jack beams, anchor bolts are made of tubular reinforcement with ridges oriented along a helical line, and the foundation is made with a central nozzle expanding downward and completely filled with loose aggregate, for example crushed stone, interacting from below with a soil base under the foundation, and each of the branches of the column is supported on anchor bolts through flange nuts connected to the flange of the corresponding branch of the column, and each jack beam of the column is connected and interacts with the piston of a pulsating double-acting jack resting on a loose aggregate with its plate.

In the method of restoring the design mark of the foundation of a two-branch eccentrically loaded column, the branches of which are connected to each other by jack beams, and the foundation is made with a central nozzle expanding downward, filled with loose aggregate, for example crushed stone, according to the invention, double-acting pulsating jacks are installed under the jack beams of the column, supporting their base plates on a loose aggregate, completely filling the nozzle of the foundation, and connect the piston of each mentioned pulsating jack with a jack beam, include the direct stroke of these pulsating jacks of double action, pressing the loose aggregate into the nozzle and under the foundation, thereby strengthening the soil base under it, at the same time squeeze and pull the foundation out of the ground upwards, turn on the pulsating jacks backward, tighten the jack to the jack beam, add a portion of granular aggregate under the base plate of each pulsating jack, including a straight stroke, pressing another portion of granular aggregate under the foundation, and at the same time squeezed they are lifted and pulled out of the ground and the cycles are repeated until the initial design position of the foundation and columns is fully restored, the jacks are dismantled and the supporting table is replaced in their place.

The technical result provided by both objects of the invention consists in the possibility of mechanized restoration of the design elevation of the foundation and the building frame by simultaneously extruding and pulling the foundation out of the ground with pulsation upward after uneven settlement and reducing the material consumption of the junction of the two-branch eccentrically loaded column with the foundation.

The invention is illustrated by drawings, where Fig. 1 shows a device for a unit for coupling a two-branch column with a foundation and a method for restoring the design elevation of the foundation and elevations of the building frame; figure 2 is a section aa in figure 1; figure 3 is a section bB in figure 1; figure 4 - node In figure 3; figure 5 - section bb in figure 4.

The column contains the outer 1 and crane 2 branches connected to each other by jack beams 3. The foundation 4 is made with a nozzle 5, expanding downward, and the nozzle 5 is filled with rubble, slag, sand, etc.

The nozzle cross-sectional profile can be any: round, elliptical, square, rectangular, and in the upper part the nozzle has a constant cross-section for the piston stroke of the jack, and below it expands downward, that is, the lower part of the nozzle is conical.

In the foundation 4, anchor bolts 6 of tubular reinforcement with ridges are monolithic. These ridges are oriented along a helical line. The rods of anchor bolts 6 made of tubular reinforcement work both in compression and in tension. Flange nuts 7 having flanges 8 are screwed onto the rods of anchor bolts 6. The holes in the flanges 8 of the flange nuts 7 coincide with the holes in the flanges 9 of the branches 1 and 2 of the column.

Flanges 8 and 9 are connected to each other by tensile bolts 10. Under the jack beams 3, pulsating jacks 11 of double action are connected, and the base plate 12 of each pulsating jack corresponds to the nozzle profile in the foundation 4 and rests on the loose aggregate of the nozzle 5. The piston of the pulsating jack 11 is connected to the jack beams 3 of the column, and the foundation rises above the mark of 0.000 per 500 ... 600 mm to reduce steel consumption and ease of maintenance of the unit during straightening columns.

The anchor bolt 6 has a length of 500 ... 600 mm and ends at the bottom with a similar flange nut 7, the flange 8 of which is connected to the foundation with thin anchor rods 13 mounted vertically or obliquely.

During operation, the pulsating jack 11 is replaced by a support table made, for example, from a pipe segment with flanges.

In accordance with the geodetic breakdown, for example using a laser sight, formwork is installed and the bottom of the foundation is concreted to a mark 150 ... 200 mm below the bottom mark of anchor bolts 6.

According to the template, anchor bolts 6 are installed. If necessary, thin reinforcing bars 13 are bent.

Final concreting of the foundation is carried out to the level of 500 ... 600 mm. The upper mark of the flange nuts 7 is finally verified and the column is calibrated without assembly. At the location of the pulsating power jack, a support table is placed.

The method of restoring the design elevation of the foundation and frame of the building is as follows.

After an uneven settlement of the building, the foundations and columns are leveled and the actual settlement A of each of the foundations is established. Identify those columns whose sediment exceeded the permissible.

The supporting tables under the jack beams 3 are dismantled and replaced by pulsating jacks 11 of double action of the required carrying capacity, resting their base plates on a loose aggregate that completely fills the nozzle 5 of the foundation 4.

The piston of each pulsating jack 11 is connected to the jack beams 3. Turn on the direct stroke of the pulsating jacks 11 of double action, pushing loose aggregate into the nozzle 5 and under the foundation 4, thereby strengthening the soil base under it.

At the same time, the foundation 4 is extruded and pulled out of the soil up. The reverse stroke of the pulsating jacks 11 is turned on and the reverse pulsating hydraulic jack 11 is pulled to the jack beam.

In the gap under the base plate of each pulsating jack 11, add a portion of loose filler flush with the upper face of the foundation 4, turn the pulsing jacks 11 forward and press the next portion of loose aggregate under the foundation into nozzle 5, thereby compacting and thereby increasing the strength of the soil base under the foundation (see Kotov MF Soil mechanics in examples. Higher school, 1968).

The cycles are repeated many times and the foundation is simultaneously squeezed out and pulled up by the design value A, and the column returns to its original design position. In this case, the foundation works as a macro regulator, providing a minimum of excess stresses in the building frame.

If, for example, the power of the pulsating jack is not enough to simultaneously extrude and pull the foundation up from the ground, then in this case, after the jack has been exhausted, the following operations are possible:

- loosen the anchor bolts 10 by the required value Δ;

- jack up the column by Δ;

- alternately remove the bolts 10 from one of the branches of the column;

- unscrew the flange nut 7 until it stops in the flange 9 of the column;

- re-install the bolts 10 of this branch;

- do the same with the second branch of the column.

The invention provides the possibility of implementing a mechanized method of simultaneously extruding and pulling the foundation from the soil up and restoring the original design position of the foundation, columns and the entire building frame, as well as reducing the material consumption of both steel and concrete in the junction of a two-branch eccentrically loaded column with the foundation.

Claims (2)

1. The connection node of a two-branch eccentrically loaded column with the foundation, including anchor bolts, characterized in that the column branches are connected to each other by jack beams, anchor bolts are made of tubular reinforcement with ridges oriented along a helical line, and the foundation is made with a central nozzle expanding downward, and completely filled with loose aggregate, for example gravel, interacting from below with a soil base under the foundation, and each of the branches of the column is supported by anchor bolts through flanges e nuts connected to the flange of the corresponding branch of the column, and each jack beam of the column is connected and interacts with the piston of a pulsating double-acting jack, resting its plate on a loose aggregate. 2. A method of restoring the design elevation of the foundation of a two-branch eccentrically loaded column, the branches of which are connected to each other by jack beams, and the foundation is made with a central nozzle expanding downward, filled with loose aggregate, such as crushed stone, characterized in that pulsating jacks of a double are installed under the jack beams of the column actions, resting their base plates on a loose aggregate that completely fills the foundation nozzle, and connect the piston of each said pulsating jack ATA with a jack beam, include a direct stroke of these pulsating jacks of double action, pushing loose aggregate into the nozzle and under the foundation, thereby strengthening the soil base underneath, simultaneously pushing and pulling the foundation out of the ground up, turn on the pulsating jacks, pull the jack to the jack beam, add a portion of granular aggregate under the base plate of each pulsating jack, including their direct course, pressing the next portion of granular aggregate under the foundation, and at the same time pour and pull it up from the ground, and the cycles are repeated until the initial design position of the foundation and columns is fully restored, the jacks are dismantled and the supporting table is installed in their place.

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