Method of seismic isolation of foundations of buildings and structures
(57) Abstract:Summary of the invention in the soil and develop a pit, cover the bottom of the pit with a layer of soil fine sand fraction at the bottom of the pit perform drainage grooves for the formation of the drainage system, occiput pillow, set on a bed Foundation blocks with seismofocal and fall asleep sinus. The bottom of the pit do with a slope to the drain grooves equal to 0,005 - 0,001. As the material of the pillow and fill material sinuses use draining material with a particle size of 10 - 70 mm 3 Il. The invention relates to the construction, specifically designed to reduce fluctuations, reported the building, structure, constructed in a seismic area, when an external impact from earthquakes and man-made vibrations of the ground.Know the basis for the Foundation of buildings, including pile Foundation, intermediate cushion and the base block /1/.However, the method is implemented when it is created, does not provide permanent dissipative properties for the entire operation period /a period of not less than 50 years), especially when watering.The closest technical solution to the stated is lowana, filling pillows on the part of the excavation, placement on a bed Foundation blocks, filling of the sinuses of the pit /2/.The disadvantage of this Foundation are insufficient seismic properties of the latter.The purpose of the invention reduce the transmission of the Foundation of the horizontal and vertical oscillation amplitudes due to the effect of dry friction in the intermediate cushion.This objective is achieved in that during the development of the pit, filling pillows on the part of the excavation, placement on a bed Foundation blocks and filling of the sinuses of the pit, before dumping the bags on the bottom of this pit perform drainage grooves followed by the formation of a drainage system which connects the outlet network and observation wells, and cover the bottom of the pit with a layer of soil fine sand fraction, while the bottom surface of the trench is performed with a bias to the drain grooves, equal to 0.005.0,01, as the material of the pillow and fill material sinuses use draining material with size fractions 10.70 mm, and Foundation blocks perform with seismofocal in their upper part.In Fig. 1 shows an embodiment profundamente the Oia drainage system beneath the building foundations of the proposed method.The proposed method of seismic isolation of foundations of buildings and structures is as follows.Tear off a pit, the bottom 1 of which plan slant i 0,005.of 0.01, and at the bottom of the pit perform the drainage grooves 2, followed by the formation of the drainage system 3 by covering the bottom of the pit (5.15 cm) protective layer 4 of a material fine sand fractions /drain cover/, laying in the ditch drainage pipes 5, receiving water from the filter bed; a drain pipe connected to the discharge network 6 and the observation wells 7, then occiput cushion 8 of the filter material fraction (10.70) mmThen set the Foundation blocks 9, on top of which is placed profundamente seismos 10 and produce the filling of the sinuses of the same material as the cushion, for example, from macro-grained rock soil /gravel, gravel, expanded clay, slag, coarse sand/, in which the space between the debris is not filled or filled to not more than 20% sand, sandy loam, and on top of the pads are placed protective layer 11 from the ground all the same fine sand fraction.Seismic isolation in the form of intermediate cushion with drainage is based on the principle of creating constructionsee building, situated above the pillows.The basis for the proposed seismic isolation put the General principle of damping due to MICRODIA /slippage in the pillow/, which dramatically increases the energy dissipation, leading to reduced shear displacements /velocities, accelerations/ vibrations and to reduce the duration of intense fluctuations compared with that which would be in the absence of damping cushion.The application of the method of seismic isolation of buildings and structures reduces material costs and increases the seismic stability of the whole object. Method of seismic isolation of foundations and structures, including the development of the pit, filling pillows on the part of the excavation, placement on a bed Foundation blocks and the filling of the sinuses of the pit, characterized in that before dumping the bags on the bottom of the pit perform drainage grooves followed by the formation of a drainage system which connects with the discharge network and observation wells, and cover the bottom of the pit with a layer of soil fine sand fraction, while the bottom surface of the trench is performed with a bias to the drain grooves and equal to 0,005 0,01, as the material of the pillow and fill material sinuses use DeNiro the
FIELD: building, particularly for erecting pile-plate foundations for industrial buildings and structures, for instance for main buildings of heat power plants.
SUBSTANCE: method involves arranging drilled cast-in-place pile, grouting plate grillage and installing antivibration mounts. Anchorage reinforcement is placed in pile heads and arranged along marked building axes. Anchorage reinforcement is then grouted and resilient antivibration mounts are installed at pile heads. Resilient antivibration mounts are fixed in plane on anchorage reinforcement with the use of fasteners so that antivibration mounts may perform restricted movement. Installed on antivibration mounts is rigid metal foundation frame of upper building in which anchoring reinforcement for securing skeleton of building to be erected is installed. Reinforcement rods and supply lines are inserted in process orifices formed in foundation frame beams and frame is grouted to form panel grillage.
EFFECT: reduced work content, increased simplicity and speed of bearing grillage frame erection; improved building stability.
9 cl, 5 dwg
FIELD: building, particularly frame structures for civil and industrial buildings to be erected mainly on sinking territories or territories to be developed.
SUBSTANCE: method for connecting eccentrically loaded column with foundation by fixing thereof in orifice formed in foundation involves forming composite multi-stepped foundation having central, medium and outer steps and through wedge-like orifices made in each step, wherein orifices taper downwards with cone angle of 1/10 to 1/5 (5.7 - 11.3o) and each step and lower column end are also wedge-like and have cone angles of 1/12 - 1/6 (4.8 - 9.5o), steps are inserted one into another and wedge-like column end extends into central orifice of central foundation step; tightly installing pair of force mounting wedges in gap between wedge-like column end and foundation, wherein each mounting wedge comprises two levers pivotally connected by the first ends to change cone angle of wedge and to regulate column verticality; securing jack communicating with hydraulic pulsing pumping plant to one lever; filling gap between foundation steps and gap between wedge-like column end and foundation with solid powder material, particularly with crushed granite with particle dimensions of 5 - 10 mm; covering upper part of central orifice of central step with concrete plug of 40 - 50 mm thickness along column perimeter; arranging centering pads on concrete plug symmetrically about eccentrically loaded column; installing pair of jacks on centering pads; securing mounting device formed as split terminal including L-shaper rests pressed to column and connected one to another by means of two bars and pins with stressing nuts, wherein jack pistons cooperate with L-shaped rests from below to maintain design position of eccentrically loaded column and to solidify powder material in gap between column tip and foundation orifice wall.
EFFECT: provision of straightening column position relative foundation without connection unit damage; increased reliability of anchoring eccentrically loaded column in foundation.
FIELD: anti-seismic protective units for buildings and structures.
SUBSTANCE: proposed protective unit includes many modules laying in one plane at contact with each other; each module consists of two identical parts made from rigid plastic material and connected in center by means of silent-block; used automobile tire is placed between them, thus forming deformable elastic chamber filled with granule-like elements made from plastic material; granule-like elements possess hydraulic properties.
EFFECT: possibility of weakening, dissipating and dampening seismic wave.
2 cl, 4 dwg
FIELD: construction, particularly to construct buildings and structures in earthquake zones or special-purpose objects.
SUBSTANCE: multistory earthquake resistant building includes upper spatially stiff stories defined by columns, crossbars, floor panels and well panels; ground or the first floor formed of kinematical posts with rounded upper and lower edges so that posts may perform stable swinging during earthquake along groves. The grooves are formed in upper framing members created as a part of floor panel or ground floor and in lower framing members made as a part of foundation bearers. Rounded post edges have variable curvature acting as lockable and releasable links and limiting large horizontal movement along with retaining post capacity to reduce seismic forces affecting on buildings and structures during earthquake. Kinematical posts are monolithic or composed of several parts without embedded members. Horizontal cross-section of each kinematical post define star with 3, 4, 5, 6, 7, 8, 9 … n points, wherein unrestricted number n of star points create stiffening ribs.
EFFECT: increased efficiency, strength and stability of the support under broad earthquake frequency spectrum.
FIELD: construction, particularly to erect buildings and building structures on permafrost ground, which may thaw during building or building structure usage.
SUBSTANCE: method involves digging-out pit; filling the pit with nonfrost-susceptible material; introducing reinforcing members in the nonfrost-susceptible material and mounting foundations. The reinforcing member is made as rigid reinforced concrete panel arranged in compacted nonfrost-susceptible material layer. Distance between foundation bottom and panel top is selected to provide uniform load transmission from the foundations to the panel. Upper panel surface is formed of heat-insulation material and sloped parts inclined from panel center to panel periphery are created. Panel rigidity is related with thawing permafrost ground deformation extent.
EFFECT: reduced building deformation caused by non-uniform deformation of thawing permafrost ground.
FIELD: foundations for special purposes, particularly foundation platforms connected to tanks.
SUBSTANCE: reinforced concrete beams or trusses are installed between reinforced concrete panels of upper and lower belts of three-dimensional platform. Reinforced concrete beams or trusses have inclined upper face and are connected one to another in center by monolithic rigid core. The reinforced concrete panels have trapezoid or segmented shape in plane. Reinforced concrete beams or trusses with key connections are located in parallel between reinforced concrete panels of upper and lower belts. Tank walls and coverings have arched structure shaped as prismatic polyhedron inscribed in cylindrical surface defined by square parabola or another curve with generatrices parallel to beams or trusses of three-dimensional foundation platform.
EFFECT: increased structural efficiency due to increased reliability of three-dimensional foundation platform, reduced metal consumption and labor inputs.
2 cl, 9 dwg
FIELD: building, particularly pile foundations including floating piles.
SUBSTANCE: method involves injecting hardening mortar via injectors driven in ground in area between the piles and at pile ends for depth exceeding 1-2.5 m, wherein the injectors are spaced 1.5-2.0 meters apart. The hardening mortar pressure gradually increases. The hardening mortar is injected up to creation of hydraulic fracture cavities having 1.5-2.0 m radii around each injector. Then the injection operation is preformed under constant pressure of 2-10 atm to consolidate and reinforce ground, compress the piles to multiply load-bearing capacity thereof by 1.5-2 times.
EFFECT: increased load-bearing pile capacity due to increased side friction and head resistance.
3 cl, 1 dwg
FIELD: tire utilization and use in building, particularly to erect earthquake resistant foundations for low buildings, to construct road beds in marshlands and to erect mudflow control structures of used tires.
SUBSTANCE: method involves laying tires one upon another in several layers so that tread tire parts are in close contact with each other; connecting the tires by inserting fastening members in tire interiors. Tires are grouped in the first tire layer and then perforated strips are installed in interior of each tire. Number of strips depends of number of adjacent tires. Perforated strip orifices are spaced apart a distance corresponding to tire layer thickness. Then adjacent tires are pulled together by means of fastening pins having flat non-threaded parts. The pins are located from top and bottom of tire sides. Then next tire layers are laid and connected in the same way to provide stack having necessary height. Spaces defined in tire stacks and between the tires are filled with filler.
EFFECT: increased reliability of tire connection.
FIELD: building equipment, particularly foundations for sinking or earthquake territories.
SUBSTANCE: method involves determining active vibration zone and surface length wave; creating vertical screen between active vibration zone and building or building structure to be protected as at least one well row, wherein the wells are drilled for depth equal to at least 0.5 of surface wave length and straight line passing from any active vibration zone point to extreme points of vertical screen does not cross building or building structure foundation; creating additional screen under building or building structure base as a number of wells drilled in accordance with uniform grid pattern for length of not more than vertical screen depth. Wells forming vertical and additional screen are treated with consolidating solution.
EFFECT: increased efficiency of building or building structure protection against vibrations or seismic inflexibility of building and building structure base ground.
FIELD: construction, particularly to erect heavy structures on compressible ground in seismic zones.
SUBSTANCE: method involves driving piles; connecting members formed as inversed cups to pile heads; connecting pile heads with slab-like raft. In the case of foundation construction in seismic zones plies having different lengths are used. Long piles are arranged along longitudinal and transversal axes of load-bearing walls. Short piles are driven between main ones. Reinforcement bars of short piles are introduced in raft body for length equal to bolting length necessary to create rigid joints after raft concreting. Before raft concreting members made as inverted cups are put on long pile heads to create gap with thickness equal to half of immersion depth admissible for structural layout of building under construction. Foamed polystyrene layer having thickness equal to gap thickness is formed on upper ends of long piles.
EFFECT: extended technological capabilities due to increased building structure load transferred to structure foundation and be taken by slab and decreased structure immersion.