RU2139390C1 - Method for restoring design positioning of foundation and column - Google Patents

Abstract

FIELD: construction engineering. SUBSTANCE: this relates to construction and operation of buildings erected on settling ground. Method for restoring design positioning of foundation and column after their non-uniform settling consists in following. Installed above settled foundation symmetrically relative to column are two double-cantilever beams in function of levers which are longer than l≤H/tgφ+B, where H - depth of foundation, B - overall dimensions of foundation in plan, φ - angle of repose of ground slope. Each lever is pivotally connected by its middle part to column and settled foundation. Shorter cantilever of each beam is rested on base through distributing plate. Longer cantilever of each beam is rested on base through hydraulic jack and distributing plate. After that, poker vibrators are sunk in ground and actuated, thus breaking cohesion between foundation and ground, ground is fluidized, hydraulic jacks are actuated, and foundation together with column is pulled out of ground to required value, and simultaneously recess created under foundation is filled with ground which is fluidized by poker vibrators. Then, poker vibrators are switched off, hydraulic jacks are switched on for reverse stroke to raise opposite end of beam-lever, spacer is placed under it, hydraulic jack is actuated for direct stroke, and cycles are repeated so as to raise foundation together with column to required value. After that, next column is subjected to similar procedure. Application of aforesaid method allows for reducing labour-intensity of operations. EFFECT: higher efficiency. 2 cl, 2 dwg

Description

 The present invention relates to the construction and operation of buildings on subsiding soils.

 In buildings built on subsiding soils or in undermined areas, uneven precipitation of columns and foundations under them often violate normal safe operation.

 Such precipitation is especially unfavorable in industrial buildings equipped with bridge cranes. In this case, the straightness of the crane runways is violated, the minimum gaps between the cranes and trusses and between the cranes and columns are not ensured.

 A known method of straightening bridges described in the textbook Gibshman E.E. et al. (1, p. 279). We accept this method as an analog.

 In bridges in the nodes supporting the spans on the coastal and intermediate supports, special “jack beams” are usually provided, under which, when the bearings are supported, jacks are placed and by means of them they restore the design position of the bridge.

 There are also known methods for straightening crane structures described in patents (2, 3, 4, 5). These patents describe devices and two methods that return designs to their design position.

 Unfortunately, we do not know how to straighten the entire industrial building frame, including columns and foundations, despite the great need for such developments.

 The technical result of the invention is the reduction of the complexity of the work through the mechanization of the process.

где H - глубина заложения фундамента;
B - габарит фундамента в плане;
φ - угол естественного откоса грунта.It is achieved by the fact that two double-beam beams (two-arm levers) with a length of more than

where H is the depth of the foundation;
B - foundation dimension in plan;
φ is the angle of repose of the soil.

 Pivotally connects each of the levers to the column and the middle part that has settled down, rest the shorter lever arm of each beam through the distribution plate to the base, and the longer through the jack and distribution plate also to the base. Deep vibrators are immersed in the soil around the settled foundation, while moistening the soil, they include deep vibrators, disrupting the adhesion of the foundations to the soil, liquefying it, turn on hydraulic jacks and gradually pull the foundation together with the column to the required size while filling the sinuses formed under the foundation with diluted soil vibrators.

 A comparison of the claimed method with an analogue shows its significant differences.

 The design position of the foundation and the column is restored by means of two double-beam beams (two-arm levers), which provide an increase in the pulling force.

 In FIG. 1 shows a method and apparatus for restoring the design position of the foundation and columns.

 In FIG. 2 shows a hinged assembly for coupling a double-beam beam-lever with a column and a foundation.

 In FIG. 1, a settled foundation 1 with a column 2 is shown. On both sides of the column 2, two-beam beams (two-arm levers) 3 with a short “a” and a long “b” shoulder are symmetrically mounted. The beam-levers 3 are pivotally connected to the settled basement 1 and the column 2. Under the short arm “a”, support plates 4 are placed that distribute the support reaction of the lever to the base 5.

 Under the long “b” shoulder of each lever 3, power jacks 6 are placed, resting through the distribution plate 7 on the base 5. Around the settled foundation 1, deep vibrators 8 are arranged to impart fluidity to the soil and break the connection between the soil and the foundation. Each two-arm lever 3 is pivotally connected to the column 2 and the foundation 1 by means of rods 9, and balancers 10 connected to the anchor bolts 11.

 The straightening of the foundation 1 together with the column 2 is carried out in the following way.

 Distribution plates 4 and 7 are installed under the short “a” and long arm “b” of the lever 3. Under each of the long arms “b”, a hydraulic jack 6. Mount with levers 3 and pivotally connect them to the column 2 and the foundation 1 by means of rods 9 and balancers 10. Deep vibrators are installed around the foundation 8. After the preparatory work is completed, the vibrators 8 are turned on, informing the soil of vibrations and liquefying it, the power jack 6 is moved forward and pressing the long arm “b” of the lever with force F, support the column 2 together with the foundation 1 s force T, stole chennoy proportion to the ratio of shoulders.

 The soil liquefied by vibration fills the sinus formed under the sole of the foundation. Turn off the vibrators 8. Turn on the reverse stroke of the hydraulic jack 6 and raise the short shoulder "a".

 Pads are placed under it and the cycle is repeated until the design position of the column 2 and the foundation 1 is restored.

 With uneven settlement of the foundation, one of the jacks develops greater force and straightens the skew. Skew can also be eliminated by loading one of the sides of the foundation.

 For transverse movement of the foundation, simultaneously with the vertical forces, and the included vibrators, a horizontal force is applied to it. To facilitate movement from one side of the foundation, the soil is removed.

 Then make the straightening of the next column and foundation. The economic effect arises as a result of the mechanization of the restoration of the design position of the foundation and columns.

List of references
1. Gibshman E.E. and others. Bridges and structures on the highway. M .: Transport, 1972, part 2, p. 404.

 2. SU 945054 A, 07.23.82.

 3. SU 998 306 A, 02.23.63.

 4. SU 1248937 A, 08/07/86.

 5. SU 1481192 A, 05.23.89.

Claims (2)

1. A method of restoring the design position of the foundation and columns after their uneven settlement, characterized in that two double-beam beams-levers longer than

where H is the depth of the foundation;
B - foundation dimension in plan;
φ is the angle of repose of the soil,
each lever is pivotally connected to the column and the middle part that has settled down, rest the shorter console of each beam through the distribution plate to the base, and the longer through the jack and distribution plate to the base, immerse deep vibrators into the ground, turn them on, disrupting the adhesion of the foundations to the ground and liquefying the soil, include hydraulic jacks and gradually pull out the foundation together with the column to the required size and at the same time fill the sinus formed under the foundation with liquefied vibrators Then turn off the depth vibrators, turn on the hydraulic piston jack return stroke, raising the opposite end of the beam-lever, put a lining under it, turn on the hydraulic jack straight stroke and repeat the cycles, raising the foundation together with the column to the required value, then proceed to straightening the next column.  2. The method according to p. 1, characterized in that the soil filling the sinuses of the foundation is moistened.

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