Method of foundation bed construction by horizontal reinforcing with solid concrete components

FIELD: construction.

SUBSTANCE: invention relates to foundation construction technologies, and particularly, to reinforcing technology used for compressible foundation sections of detached or standard foundations in buildings and structures being erected under severe engineering and geological and hydro-geological conditions. Method of foundation bed construction by horizontal reinforcing with solid concrete components includes foundation pit mining and installation of horizontal stiff lengthy elements such as crossties. As soon as the foundation pit is developed to the designed depth, which is equal to the sum of foundation bed depth of installation and buffer layer thickness, and is bladed, foundation pit bottom is leveled. After that, foundation axes are broken down and longitudinal axes of future solid crossties are broken down against the established construction layout of the longitudinal axes of future solid crossties regarding foundation axes. The chaps for solid crossties are made mechanically or manually on foundation pit bottom along the marked longitudinal axis of the future solid crossties. Besides, the chap depth is equal to the cross section of the future solid crosstie. The chap bottom is cleaned and reinforced frameworks are laid down in the chaps. The chaps are then cemented together with the reinforced frameworks by means of concrete mix B15 with further compacting. To install horizontal reinforced solid elements in the chaps such as solid crossties are located on the foundation pit level. So, the crosstie distributing element is formed in the compressible section of the built structure foundation bed. In addition, the length of each solid crosstie must not exceed the distance between the external shapes of the utmost foundation edges of the building. The chaps for solid crossties installation are made in parallel to each other and at design distance from each other so that the area of crosstie distributing element overlaps foundations area completely. As soon as the concrete mix in the chaps will achieve the strength no less than 50% from the design strength, the buffer layer is laid down, leveled and compacted. The buffer layer is laid down to the level of built structure foundation bed. The buffer layer consists of sand, crushed stone from solid rocks or crushed stone from ferrous metallurgy wastes. The buffer layer thickness must not be less than 1/3 of solid crosstie width or cross section diameter. The maximum size of crushed stones must not exceed 1/5 solid crosstie width or cross section diameter.

EFFECT: improvement of soft ground foundations bearing capacity and reduction of material consumption.

4 dwg

 

The invention relates to a Foundation, in particular to the technology of reinforcement compressible zone base of free-standing slab and foundations of buildings and structures erected within a complex engineering-geological and hydrogeological conditions.

There is a method of strengthening the Foundation (1), including the development of the pit and the device horizontally long hard elements (sleepers). This method can only be used in strengthening the foundations of emergency or reconstructed buildings.

Proposed technical solution allows the use of horizontally spaced rigid extended elements (solid ties) for new construction of buildings, erected in complex engineering-geological and hydrogeological conditions.

This is achieved in that in the method of Foundation structures with horizontal reinforcement, including the development of the pit, the device horizontally teams hard long elements (sleepers), according to the invention after the development of the pit design depth and its layout the bottom of the pit level, and then produce a breakdown of the axes of the foundations of the constructed facilities and a breakdown of the project design concept longitudinal axes future monolithic sleepers on the relative axes of the bases, next on the bottom of the pit at spaced longitudinal axes future monolithic sleepers are laid mechanically or manually cracks devices in their monolithic sleepers, while the depth of the slit is equal to the height of the cross section of future monolithic sleepers, and then produce clean the bottom of the slots, laying them rebar cages and concreting slots with stacked them in steel frames with concrete B15 with subsequent compaction, for the formation of cracks in horizontal reinforced solid elements (solid sleepers), located at the level of the bottom of the pit, forming, thus, treating the dispenser in the compressible area of the Foundation construction of buildings, the length of each of the monolithic sleepers must exceed the distance between the outer contours of the sole of extreme bases of construction of constructions, besides, cracks devices in their monolithic sleepers are laid parallel to each other and the calculated distance from each other so that the area of the tie dispenser completely cover the area of foundations of buildings under construction, and once filled, the concrete mixture into the slits will gain strength not less than 50% of the project, make the filling, levelling and compacting of the buffer layer, with a buffer layer occiput to mark the laying of podos the s foundations built structures out of sand or gravel of hard rocks or crushed slag ferrous metallurgy, having a stable structure against all kinds of decay (silicate, manganese, iron, and others), the thickness of the buffer layer should not be less than 1/3 width of the cross-section of the monolithic sleepers, and the maximum particle size of the crushed stone shall not exceed 1/5 of the width of the cross-section of the monolithic sleepers, in addition, the development of the pit to produce a design depth equal to the sum of the depth of the sole foundations of the future construction and thickness of the buffer layer.

This method can be used in the construction of buildings erected on a weak soil foundations of artificial or natural additions, including having specific properties (sagging, heaving, swelling and other) at the location of the groundwater level below the soles of monolithic sleepers >0,10 m Implementation of the present invention, namely a device sleeper distributor of horizontal rigid extended elements (monolithic sleepers), significantly, 2-3 times, to increase the bearing capacity of weak soil foundations, reduce and redistribute stresses in plan and depth of the compressible zone of the Foundation of the construction objects and enables you to use for the construction of any structures weak soils, and reduce the material cost of the device OS is Finance foundations.

The method is illustrated by the drawings, where Fig. 1 shows the scheme of realization of this method, Fig. 2 - section b-B of Fig. 3 is a structural diagram of the location of the sleepers in terms of strip Foundation, in Fig. 4 shows a cross-sectional sleepers, located at the level of the bottom of the pit.

The method is performed as follows.

First, develop the pit (1) design depth (H), is equal to the sum of the depth (H1) laying the foundational footings (2) and thickness (h) of the buffer layer. The bottom of the pit (1) align and plan to the design elevation depth (H) of the pit, produce a breakdown of the axes of the bases (2) buildings under construction and breakdown according to structural diagram (Fig. 3) the longitudinal axes future monolithic sleepers (3). Depending on the type of Foundation (2) buildings under construction and according to structural diagram at the bottom of the pit (1) spaced longitudinal axes parallel to each other are laid mechanically or manually slit (4) devices in their monolithic sleepers (3). The depth of the slit (4) is determined by the height of the cross-section (a) of the future monolithic sleepers (3). The height of the cross-section (a) determined on the basis of strength calculations, and it depends on the load on the basement of the future. Slit (4) devices in their monolithic rails (3) are laid parallel to each other and on the estimated distance () from each other. Then make scraping the bottom of the slit (4) from the loosened soil and, if disrupted the stability of the walls, restore the wall. Then placed in a slit (4) reinforcing cages (5) and concreted slit (4) placed them in the reinforcing cage (5) concrete class 15, followed by sealing, for example, vibration. Reinforcing cages (5) calculated on the perception of bending moments and other stresses transmitted on a monolithic sleepers (3). Thus, the slit (4) serve as formwork for the monolithic sleepers (3). Monolithic sleepers (3) is produced so that the cross section of the monolithic sleepers (4) were located below (6) of the bottom of the pit (1). The length (L) of each of the monolithic sleepers (3) must exceed the distance (E) between the outer dimensions of the foundations (2) buildings under construction. In addition, the area (SW)formed by thus treating the distributor (7) should completely cover the area (Sf) foundations of the constructed facilities. After the concrete is filled in the gap, reaches a strength of at least 50% of the project, produce filling the buffer layer (8), its alignment and sealing. A buffer layer (8) occiput to the mark (9) laying foundational footings (2) construction of buildings of sand or gravel from the solid rock. Use of crushed slag black is metallurgii, having a stable structure against all kinds of decay (silicate, manganese, iron, and others). The thickness (h) of the buffer layer (8) must not be less than 1/3 width (d) diameter or cross-sectional monolithic sleepers (4), and the maximum particle size of the crushed stone shall not exceed 1/5 of the width (d) diameter or cross-sectional monolithic sleepers (3). In the case of the use of crushed stone produced rasklinivanie buffer layer (8) sand. Increasing or decreasing the thickness (h) of the buffer layer (8) leads to a corresponding change conditions and the degree of loading of monolithic sleepers (3) length, increase or decrease the carrying capacity tie dispenser as a whole.

The source of information

1. Patent of Russia №2229562, CL E02D 27/08, 2002.

The method of Foundation structures with horizontal reinforcement monolithic reinforced concrete elements, including development of the pit, the device horizontally long hard elements - sleepers, characterized in that after the development of the pit design depth is equal to the sum of the depth of the sole Foundation of the constructed facilities and the thickness of the buffer layer and its layout, the bottom of the pit level, and then produce a breakdown of the axes of the foundations of the constructed facilities and a breakdown of the project construction the th scheme longitudinal axes future monolithic sleepers relative to the axis of foundations, next, on the bottom of the pit, marked longitudinal axes future monolithic sleepers are laid mechanically or manually cracks devices in their monolithic sleepers, while the depth of the slit is equal to the height of the cross section of future monolithic sleepers, and then produce clean the bottom of the slots, laying them rebar cages and concreting slots with stacked them in steel frames with concrete B15, with subsequent compaction, for the formation of cracks in horizontal reinforced monolithic elements in - situ sleepers, located at the level of the bottom of the pit, forming, thus, treating the dispenser in the compressible area of the Foundation construction structures, the length of each of the monolithic sleepers must exceed the distance between the outer contours of the sole of extreme bases of construction of constructions, besides, cracks devices in their monolithic sleepers are laid parallel to each other and the calculated distance from each other so that the area formed by treating the distributor completely cover the area of foundations of buildings under construction, and after the concrete is filled in the gap will gain strength not less than 50% of the project, make the filling, levelling and compacting of the buffer layer, with a buffer layer occiput to ahmedsaleemi foundational footings constructed buildings of sand or gravel from the solid rock or crushed slag ferrous metallurgy, the thickness of the buffer layer should not be less than 1/3 width of the cross-section of the monolithic sleepers, and the maximum particle size of the crushed stone shall not exceed 1/5 of the width of the cross-section of the monolithic sleepers.



 

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