Foundation structure for building and building structure

FIELD: construction, particularly new building erection and existent building reconstruction under any engineering-geological circumstances.

SUBSTANCE: foundation structure comprises shallow foundation and reinforcement members. Reinforcement members are made as vertical bars of precast or cast-in-place piles having diameters less than 200 mm and arranged along foundation perimeter. The piles are spaced a distance from outer foundation faces. The distance is equal to 0.1-0.5 of reinforcement member diameter. Distance between neighboring piles is equal to 2-4 reinforcement member diameters and reinforcement member length is 15-20 diameters thereof.

EFFECT: increased load-bearing capacity due to creating compressive operational conditions under different engineering-geological circumstances, increased dynamic rigidity of foundation base and reduced foundation deformation and vibrational amplitude.

9 dwg

 

The invention relates to the construction and can be used in new construction and renovation of buildings and structures in any engineering-geological conditions.

Known foundations for buildings and structures erected on ground subsidence [As, MKI E 02 D 27/12. Publ. 23.03.1973, BI No. 16], including pile Foundation, pile and emolument (for piles)located outside the grillage at a distance equal to 1-1,5 of pile diameter from its outer edges. The disadvantage of this Foundation is that increasing its load bearing capacity is ensured only through the involvement of the surrounding soil in joint work by compaction subsidence of the soil.

Also known foundations for buildings and structures, perceiving horizontal, including dynamic load [As, MKI E 02 D 27/12. Publ. 15.08.1981, BI No. 30 - prototype], including grillage, resting on piles, emolument (for piles)that are located outside of the grillage and United with him ties made sloping, descending to the grillage. This Foundation allows for the use of emoluments associated with the Foundation is to improve the bearing capacity of the Foundation and to improve the work of the Foundation under the action of both vertical and horizontal static and dynamic loads. The technical nature of identigene the results of this Foundation is chosen for the prototype. The lack of Foundation of the prototype is that it is not intended to change the conditions of the soil under the sole Foundation.

The technical result of the invention consists in increasing the bearing capacity of foundations for buildings, structures and machines with dynamic loads by creating compression of the working conditions of the soil under the sole Foundation in various geological conditions.

The problem is solved due to the fact that the Foundation for buildings and structures, including the actual shallow foundations and emolument, according to the invention emolument made in the form of vertical rods of the driven or bored piles of small diameter up to 200 mm and are located on the contour of shallow foundations to the distance from the outer faces of 0.1-0.5 diameter emolument, with the same step is 2-4 diameters emolument, the length of each emolument equal to 15-20 his size.

Increasing the bearing capacity of foundations for buildings and structures is achieved by creating compression of the working conditions of the soil under the sole shallow foundations, since the location of emoluments in his path outside the Foundation at a specified distance from the specified step length and emoluments limits the lateral Defoe is Macy soil Foundation. The proposed Foundation can be used both in new construction and the renovation of existing buildings and structures, as well as for a device or gain foundations for equipment with dynamic loads. The length of emoluments is determined depending on the engineering-geological conditions of the site, the step between emolumentum assigned on the basis of the design of the Foundation and nature of its loading.

In figures 1, 3, 5 shows a schematic of the proposed foundations for buildings and structures with contour reinforcement for different designs of foundations; 2, 4, 6-sections 1-1 to 1, 3, 5, respectively; figure 7 - dependence of the settling of the Foundation S from load P; Fig - parameters of the oscillations of the Foundation under the action of vertical dynamic loads; figure 9 is the same, under the action of horizontal dynamic loads.

Foundations for buildings and structures includes the actual shallow foundations 1 arranged on a natural base 3, and emolument 2. Emolument carried out in a vertical rods of the driven or bored piles of small diameter up to 200 mm Immersion of the finished concrete, metal or wooden emoluments can be carried out by driving by analogy with driven piles or emolument can be made on the spot drilled in the s or punched wells by analogy with the manufacture of bored piles.

The location of emoluments contour shallow foundations prevents horizontal and reduces vertical movement of the soil, contributes to the creation of compression of the working conditions of the soil Foundation under the Foundation. This increases the bearing capacity of the Foundation, a significant reduction of the deformation of the base and the reduction of vibration parameters of the Foundation under the action of dynamic loads. The upper part of emoluments perceives shear stresses and unloads the subgrade directly beneath the Foundation and the lower works as a pile, transferring the load to the underlying soil layers. Unlike pile foundations, including the Foundation of the prototype, the advantage of the invention is the incorporation in the soil under the sole Foundation. In the case of applying the contour of the reinforcement during reconstruction in contrast to transplant Foundation on piles advantage of the proposed Foundation is no need to develop additional deformations are needed to enable emoluments in the work, so as to increase the bearing capacity of the Foundation is due to changes in operating conditions of the subsoil under the sole Foundation. Disclaimer pair of emoluments with the body strengthen the Foundation has significant value is e during reconstruction, as it does not require the interruption of load-bearing structures, but also greatly simplifies the work. The application of the proposed Foundation allows you to increase its carrying capacity more than 2 times and reduce precipitation up to 3-4 times that can be seen from Fig.7, which shows the dependence of the precipitate Foundation S from load P: 1 - the Foundation on the natural basis; 2 - reinforcement along the contour with step 6,7d; 3 - reinforcement on the path from step 3,3d; 4 - pile Foundation with step 3,3d.

The location of emoluments contour shallow foundations, even without soil compaction, reduces the amplitudes of the Foundation and increase the natural frequencies of the system (see Fig and 9, where curve 1 shows the dependence of the amplitude of the oscillation frequency of the Foundation on the natural basis 3; curve 2 is the same, with reinforcement along the contour of the concrete emolumentum in drilled wells with step 3,6d). Compared to the Foundation on the natural basis in gorizonalno area is the reduction of the amplitudes of the oscillations under the action of vertical dynamic loads up to 7 times (see Fig), and horizontal - up to 2-3 times (see Fig.9). Thus, the proposed Foundation helps to increase the stiffness of the soil Foundation under the action of dynamic loads and can be used to reduce vibrations of foundations, especially p is on the low-frequency mechanisms. When the device emoluments piling or manufacture them in wells, without excavation, there is the additional effect of compaction of the surrounding soil. The results obtained in experiments with experienced foundations in situ ground conditions and fully coincide with those of numerous laboratory studies.

Thus, the proposed foundations for buildings and structures that allow one to solve the technical problem - increasing the carrying capacity by creating compressive conditions in different geological conditions, as well as increasing the dynamic stiffness of the Foundation and, as a consequence, the reduction of sediment and amplitudes of vibrations of foundations.

Foundations for buildings and structures, including the actual shallow foundations and emolument, characterized in that emolument made in the form of vertical rods of the driven or bored piles of small diameter up to 200 mm and are located on the contour of shallow foundations to the distance from the outer faces of 0.1-0.5 diameter emolument, with the same step is 2-4 diameters emolument, the length of each emolument equal to 15-20 his size.



 

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FIELD: construction, particularly new building erection and existent building reconstruction under any engineering-geological circumstances.

SUBSTANCE: foundation structure comprises shallow foundation and reinforcement members. Reinforcement members are made as vertical bars of precast or cast-in-place piles having diameters less than 200 mm and arranged along foundation perimeter. The piles are spaced a distance from outer foundation faces. The distance is equal to 0.1-0.5 of reinforcement member diameter. Distance between neighboring piles is equal to 2-4 reinforcement member diameters and reinforcement member length is 15-20 diameters thereof.

EFFECT: increased load-bearing capacity due to creating compressive operational conditions under different engineering-geological circumstances, increased dynamic rigidity of foundation base and reduced foundation deformation and vibrational amplitude.

9 dwg

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