Combined frame-raft foundation for low height construction on soft soil
SUBSTANCE: combined frame-raft foundation for low height construction on soft soil includes a girder reinforced concrete foundation under all bearing walls of the building from factory-built slabs joined to each other and combined into a system of cross bands laid onto a levelled base on the hydraulic insulation layer in the form of a film under the entire building, each of the slabs is made with a section of closed shape with an insulant arranged inside, and the space between the slabs of the frame is filled with earth mass and a layer of the insulant on top, forming the bearing structure of the first floor slab. Slabs of the girder reinforced concrete foundation under all bearing walls are made in the form of a shell of trapezoid rigid shape of section of spatial and closed type, formed from upper and lower slabs of the spatial type, connected to each other. The lower slab is arranged as wider than the upper one and is equipped with boards along the length. The upper slab is made with inclined ribs. In the boards and in the lower part of inclined ribs there are slots, where bushing keys are embedded, with the help of which the upper and lower slabs are connected to each other, and in the places of joints the slabs are equipped with reinforcement protrusions for joining with reinforcement of adjacent elements with node embedding.
EFFECT: increased efficiency of a frame raft foundation due to increased rigidity, improved thermal protection properties, reduced material intensity and labour costs in manufacturing, provision of operation reliability.
2 cl, 3 dwg
The invention relates to the construction of foundations of low-rise buildings on soft soils, which are characterized, on the one hand, small weight, low-rise buildings, and on the other hand, weak load-bearing properties of the base (less than 1 kg/m2).
In traditional solutions, according to the construction rules is SP-50-101-2004 p, States that "in complex engineering-geological conditions (specific soils, high groundwater levels, etc. can be used types of foundations specified in 8.2 b and C, i.e. the foundations on locally aggregated basis (wyrmbane or vyshtampovannyj pits, precast blocks, and others), short piles". In p the same SP stated: "precast-monolithic and monolithic foundations of all walls must be rigidly interconnected and connected with cross-belts." Specific primers also include loose, watery, tatahouine and other
Known columnar-belt Foundation, including poles, laid to a depth of freezing, and the tape-grillage connecting the upper end walls of the pillars in a single structure. A distinctive feature of this Foundation is the presence of the air gap 10...15 cm below the ribbon. Outside the gap is closed by a blind area not associated with tape-raft. Of Foundation for heaving soils air gap compenser is no extension heaving of the soil, and narcisistic - provides a soft resting at home on the base. (Yakovlev R.N. Universal Foundation. Technology TISE, 2006).
Known nezapuschenny the Foundation laid on locally compact Foundation made in the form of reinforced concrete or concrete element, placed on a bed of narcisista material - sand large and medium size, fine gravel, etc. That fill material (layer-by-layer seal, as when the device pillows) and sinus trench. The blocks are connected by welding or twisting through the armature releases, filled with concrete and form a monolithic horizontal frame, a redistributive uneven deformation of the soil (Bogdanov Û.F. Foundation from a to I. Moscow, 2005, 39, p.75).
Known slightly the Foundation, which is a concrete or reinforced concrete element, arranged, usually on a pad or filling of narcisista material, which reduces the displacement of the Foundation in the period of soil freezing and thawing. As the material spreading device of the pillow can be used sand gravelistoe, large or medium size, fine gravel, boiler slag, and napocensia soils (VSN 29-85. Projecting slightly foundations of low-rise rural buildings n the heaving soils. Moscow 1985 Item 3.2-3.4, figure 2).
The disadvantages of the above known analogues foundations are: lack of reliability for the construction of the weak, sagging, heaving soils and seismic zones because of the sensitivity to uneven ground deformation; substantial heat loss through the Foundation; increased consumption of materials and high labor costs associated with strengthening the Foundation and the use of specialized equipment.
Known foundations for low-rise construction on soft soils, taken as a prototype, including tape reinforced concrete Foundation under all load-bearing walls of the building, linked and combined in a system with cross-belts, and the foundations for low-rise construction in monolithic or precast-monolithic design is made in the form of plate-frame Foundation under all load-bearing walls of the building, laid on an aligned basis without amplification special means for waterproofing layer in the form of a film under the entire building, including the blind area, the cross-section elements are plate-frame Foundation is a closed box-like shape, consisting of upper and lower concrete slabs, combined with the extreme lateral and middle thickened ribs, between which laid the slab insulation, the protruding portion of the plates is about stamping Foundation for the plane of the exterior walls acts as a base and docked with the blind areas, laid on a heated basement in case of swelling soils, a space between the frame elements laid earthen mass and a layer of insulation on top, forming the supporting structure of the floor of the first floor, and precast-monolithic execution elements are plate-frame Foundation is made in the factory version as the teams with the armature releases for mating with a valve adjacent elements with monolithic node (patent # 105637 U1, priority date 11.01.2011, publication date 20.06.2011, the authors Ubowski NP and others, RU, prototype)
The disadvantages of the prototype are: insufficient rigidity of the frame to provide low sensitivity to uneven ground deformation due to the rectangular cross section of the element plate-frame Foundation; low thermal insulation properties due to the presence of partitions mentioned in the loft, made in the form of thickened ribs; increased consumption of concrete to perform element of rectangular cross-section with a thickened middle rib with increasing height to provide sufficient rigidity.
The objective of the invention is to increase the efficiency of plate-frame foundations for low-rise construction on soft soils by increasing stiffness, improve thermal insulation properties, reduction in the consumption of concrete and labor costs in manufacturing is Olenyi, and ensure reliable operation.
To solve the problem in plate-frame foundations for low-rise construction on soft soils, including tape reinforced concrete Foundation under all load-bearing walls of the building of the plates prefabricated, linked and combined in a system with cross-belts, laid on an aligned basis for waterproofing layer in the form of a film under the entire building, each of the plates is made with a cross section of a closed shape with inside insulation and the space between the plates of the frame laid the earthen mass and a layer of insulation on top, forming the supporting structure of the floor of the first floor, according to the invention, the plate strip concrete Foundation under all load-bearing walls made in shell trapezoidal rigid shaped cross-section spatial and closed type, formed of upper and lower plates of a spatial type, interconnected, while the bottom plate is made wider than the top and is provided along the length of the sides, and top plate are made with inclined edges, and the sides and in the lower part of the inclined ribs made grooves in which zamonolichennyj pins, with which the upper and lower plates are connected, and joints of plates provided with reinforcement bars for mating with the valve neighbouring the x elements with monolithic node.
According to the invention, the space inside the shell trapezoidal rigid forms filled insulation of any type.
The effectiveness of the proposed plate-frame foundations for low-rise construction on soft soils based on all the advantages inherent in the prototype in comparison with the known analogues, and increase its effectiveness due to a change in cross-sectional shape of the plates of the Foundation in the form of a shell trapezoidal rigid forms of spatial and closed type. Due to the change in cross-sectional shape of the plate solved the question of material, as a result of having been removed inefficient zone was reduced cross-sectional area and, consequently, the consumption of materials. The proposed cross-sectional shape is also more advantageous from the point of view of heat-shielding function and design of the transmission.
The implementation of the plates of the inventive plate-frame foundations for low-rise construction on soft soils in the form of a shell trapezoidal rigid shaped cross-section spatial and closed type, formed of upper and lower plates fastened together by concreting grooves keys and the space between the grooves is a more simple design in manufacturing. This design of the base allows you to use the te slab insulation and other insulation, lacking strength properties. Thus, this design enhances the efficiency of the plate-frame foundations for low-rise construction on soft soils by reducing labor costs in the construction of foundations on weak and heaving soils, rigidity, reliability, improved thermal insulation properties and reduction of consumption of concrete and reinforced concrete.
The invention is illustrated by drawings, where figure 1 shows a partial cross section of the Foundation; figure 2 - Assembly slab Foundation, figure 3 - General view of the Foundation axonometric view.
Plate-frame foundations for low-rise construction on soft soils executed under all load-bearing walls of the building 1 and consists of plates, made in the form of shell trapezoidal rigid shaped cross-section spatial and closed type, formed of a top plate 2 and bottom plate 3 spatial type, connected to each other. The lower plate 3 is made wider than the upper plate 2 and is provided along the length of the flanges 4. Top plate 2 is made with inclined ribs 5. The flanges 4 and in the lower part of the inclined edges 5 are made grooves 6, in which zamonolichennyj pins 7 through which the upper 2 and lower 3 plates interconnected. The space between the upper 2 and lower 3 plates filled with insulation 8 of any type. In m the hundred joints plate provided with a release valve 9 for mating with a valve adjacent elements with monolithic node.
Plate-frame foundations for low-rise construction in soft ground, laid on the aligned base 10 on the waterproofing layer 11 in the form of a film under the entire building. The space between the plates of the Foundation excavation mass 12 and the insulation layer 13 on top, forming the supporting structure of the floor 14 of the first floor.
All strip concrete Foundation made in the factory version with the installation of the loops 15 in the lower plate 3.
Production work on the device plate-frame foundations for low-rise construction on soft soils is as follows.
On the levelled base 10 is placed several layers of waterproof film 11 with a low coefficient of friction under the entire area of low-rise buildings. On waterproofing film 11 under load-bearing walls of low-rise buildings stacked elements of the bottom plate 3 a spatial type, there is, for example slab insulation 8, and then on the bottom plate 3 is placed top plate 2 and is their connection by seminolecounty keys 7 in the grooves 6, made in the flanges 4 and in the lower part of the inclined edges 5. In the joints of plates connecting reinforcement bars 9 neighboring elements and perform the monolithic nodes.
The space between the plates of the Foundation from the inside Zaklady the Ute earthen mass 12 and the insulation layer 13 on top, forming the supporting structure of the floor 14 of the first floor.
If necessary, for economic and operational needs in the gap between the frame elements can be arranged underground room (technical cavity)with independent designs from plate-frame basis. It is very important for weak soils, because the room is actually best in warm conditions and is used for household needs.
Feasibility advantage of the plate-frame foundations for low-rise construction on soft soils
The use of foundations for low-rise construction on soft soils allows the construction in difficult ground conditions (very weak, sagging, heaving soils and other) without the prior hardening of the soil, using the natural properties of the soil, combining structural and functional properties and provides strength, rigidity, allows the use of any insulation. Due to the spatial rational shaping increases the Flexural rigidity, because of this design becomes insensitive to non-uniform deformation of the base, thereby improving the reliability of operation without prior significant earthworks and devices pillows.
This design contributes to the reduce labor costs and reduce construction costs by reducing the volume of earthworks, which is minimized as it does not require excavation device pillows and the use of specialized equipment.
This design improves thermal insulation properties by reducing heat loss through the floor and Foundation by 10-15%. The insulation is protected from moisture and damage, ie ensured its longevity and, therefore, protects the soil from frost heaving. In addition, insulated mass of soil forms a bearing construction of the basement floor.
A sliding layer in the form of several layers of film under the Foundation waterproofing system performs functions that creates the possibility of slippage powerful seismic waves under the Foundation.
Thus, this construction of the Foundation of the plates in the form of a shell trapezoidal rigid shaped cross-section spatial and closed type for low-rise construction on soft soils is effective and has the reliability, durability, efficiency.
1. Plate-frame foundations for low-rise construction on soft soils, including tape reinforced concrete Foundation under all load-bearing walls of the building of the plates prefabricated, linked and combined in a system with cross-belts, laid on an aligned basis for waterproofing layer in the form of a film under the entire building, each p is it made with a cross section of a closed shape with inside insulation, and the space between the plates of the frame laid the earthen mass and a layer of insulation on top, forming the supporting structure of the floor of the first floor, characterized in that the plate strip concrete Foundation under all load-bearing walls made in the form of shell trapezoidal rigid shaped cross-section spatial and closed type, formed of upper and lower plates of a spatial type, interconnected, while the bottom plate is made wider than the top and is provided along the length of the sides, and top plate are made with inclined edges, and the sides and in the lower part of the inclined ribs made grooves in which zamonolichennyj pins, with which the upper and the bottom plate are connected, and joints of plates provided with reinforcement bars for mating with a valve adjacent elements with monolithic node.
2. Plate-frame Foundation according to claim 1, characterized in that the inner space of the shell trapezoidal rigid forms filled insulation of any type.
SUBSTANCE: basement comprises a natural or an artificial base with a curvilinear cylindrical surface, a membrane laid onto the base and a support contour in the form of a system of cross beams. The membrane is laid via gaskets made of two layers of the material sliding relative to each other, onto the curvilinear cylindrical surface of the natural or artificial base arranged in a pit and turned upwards with a convexity. In the transverse direction the membrane is attached by edges to the support contour in the form of a system of cross beams, which is submerged into the natural base.
EFFECT: reduced subsidence of a basement, higher reliability of a structure above the basement, creation of an efficient membrane basement, reduced material intensity.
SUBSTANCE: method for construction of a foundation includes preparation of a pit bottom for a foot, production of its rigid filler and an external shell of truncated cone shape with expansion of the lower part of its wall and formation of a compacted soil core. The foundation is erected from structural and soil construction elements. The bottom of the pit is prepared for the foot of the structural element with a groove in soil with the specified geometric shape, its rigid filler is made in a sectional conical form from fractions of lumpy clay and cement-sand mortar with the foot of the specified geometric shape. Expansion of the lower part of the wall in the external monolithic reinforced concrete shell is carried out with a foot with the specified geometric shape as well. A soil construction element is formed under a foot of a structural element with a rated pushing load from a structure, as a rigidly coupled compacted core in the form of a circular cone.
EFFECT: improved quality, reliability, bearing capacity of a base, performance, provision of foundation interaction with a base.
8 cl, 2 dwg
SUBSTANCE: lock prefabricated strip footing includes a support slab and rows of foundation slabs arranged on it. The support slab has a face inclined and bonder surfaces, the upper rib for a slot fixation into a lock of the above block. Foundation units have vertical and horizontal slots, protruding beyond faces of the bed and outbond surface by 1/3 of the width, at the same time the last row of the strip footing is arranged from a block, having a flat upper horizontal surface for resting of wall materials when erecting above walls.
EFFECT: reduced labour intensiveness of foundation blocks assembly, increased accuracy of foundation blocks installation, reduced deviations from horizontal and vertical planes, higher resistance of foundation blocks to displacement due to application of geometric parameters of a foundation block.
5 cl, 1 ex, 6 dwg
SUBSTANCE: foundation includes boards arranged on a levelling sand preparatory base, having limiters under a foot. Boards have through slots along edges, and limiters are arranged in the form of flat plates, as capable of their insertion into through slots.
EFFECT: increased rated resistance of base soil, increased bearing capacity and reduced subsidence of a structure.
3 cl, 3 dwg
SUBSTANCE: prestressed shallow foundation formed by a foundation slab, a ground base and a support board installed under the foundation slab and under the ground base at the optimal depth. On the foundation slab there are jacks arranged, which are connected with traction rods and with ground anchors, inserted into the support board and stressed with a total force, which is equal to or is slightly higher than the weight of the erected structure. Anchor traction rods are arranged with tubular section to supply mortar during arrangement of a support board.
EFFECT: invention provides for minimisation of ground base deformation and for elimination of bases and foundations of nearly located buildings and structures, reduction of material intensity and labour intensiveness in construction of foundations.
2 cl, 1 dwg
SUBSTANCE: method to erect a foundation on heaving soils includes installation of a foundation slab and heat insulation material onto a levelled base. A sliding layer is laid on the prepared base, and a multi-layer spatial foundation platform, comprising heat insulation material, is erected in a monolithic manner. The lower reinforced concrete slab is formed with vertical reinforcement rods protruding into crossing ribs along the entire height of the platform. Heat insulation material is laid onto the lower reinforced concrete slab with the possibility to arrange a system of crossing ribs. Crossing ribs are formed. An intermediate reinforced concrete slab is formed, the second layer of heat insulation material is set on it. Cross ribs are formed, and the upper reinforced concrete slab is formed, besides, the vertical reinforcement rods are connected to reinforcement of all slab layers.
EFFECT: reduced labour costs, provision of heat insulation material durability against potential damage, higher spatial stiffness of the foundation slab and its distributing capacity, provision of protection against frost swelling.
3 cl, 1 dwg
SUBSTANCE: heat-insulation foundation comprises wall, foot, insulator of wall, additional insulator of foundation connected to insulators of foot and blind area. Lower edge of foundation insulator is below the level of freezing of soil, and external moistureproof gasket is arranged at the edge of blind area insulator. Additional moistureproof gasket is also located under foot, connected to external moistureproof gasket, and fill is provided between foundation insulator and external moistureproof gasket.
EFFECT: improved operational properties of heat insulation foundation, simplified design, saving of energy resources.
3 cl, 2 dwg
SUBSTANCE: foundation comprises artificial bed with curvilinear surface, bearing elements and shell arranged on bed. Bearing elements are arranged in the form of radial and circular tapes for shells with positive Gauss curvature or transverse and longitudinal tapes for shells with zero Gauss curvature, forming meshy shell and laid through gaskets made of two layers of material, which slide relative to each other, onto concrete surface formed on curvilinear surface of artificial bed arranged in pit and inverted upwards with its convexity. Radial or transverse tapes are fixed by their edges to support contour in the form of support ring or a system of cross beams, which is deepened into natural bed, and gasket of elastic material is located between concrete of shell and support contour.
EFFECT: reduced settling of foundation, lower material intensity, provision of efficient and reliable protection of above-foundation structure.
SUBSTANCE: foundation comprises support part, vertical stiffening ribs installed in it, which form square metal frame, under-column part arranged on vertical stiffening ribs - metal frame and equipped with elements of column structure connection. Support part is equipped with lower and upper reinforcement grids, and stiffening ribs are arranged in the form of at least three beams coming out of a single centre located on vertical axis of foundation, are arranged in the form of bent profiles and equipped with stiffening elements. Stiffening ribs are installed between lower and upper reinforcement grids, and elements of column structure connection to support part are arranged in the form of reinforcement leads.
EFFECT: reduced metal intensity and increased bearing capacity of foundation, simplified design.
2 cl, 4 dwg
SUBSTANCE: monolithic foundation for column erected on natural or manmade basement, for instance rammed in the form of truncated cone, comprises support part with metal frame and under-column part installed on metal frame and equipped with elements of column structure connection. Support part is equipped with lower and upper reinforcement grids, and metal frame is made in the form of rigid inserts, which are symmetrically arranged versus vertical axis of foundation and are installed between lower and upper reinforcement grids. Elements of column structure connection to support part are arranged in the form of reinforcement leads.
EFFECT: simplified design, reduced metal intensity and increased bearing capacity of foundation erected under column.
3 cl, 4 dwg
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.
FIELD: building, particularly panel foundations for multistory buildings and structures, which apply non-uniform loads to ground base.
SUBSTANCE: method involves forming crossing slots in ground; reinforcing the slots with frames and concreting the slots. For panel foundation erection in clay ground pit is preliminarily dug in ground. Then crossing slots adapted for reinforcing frames receiving are created in pit ground, wherein the reinforcing frames have projected parts. Areas of reinforcing frames intersection are additionally reinforced along with connecting projected parts and concreting thereof to fill the slots.
EFFECT: increased operational effectiveness and reduced costs.
FIELD: building, particularly to erect bored cast-in-place foundations of increased load-bearing abilities including ones having bottom marks typical to shallow foundations.
SUBSTANCE: stepped foundation comprises bored cast-in-place sections formed with the use of auger. Lower foundation step includes four peripheral cylinders of Dp.l. diameters and heights equal to above diameters. Peripheral cylinder centers are located at apexes of square having side lengths equal to Dp.l.. Square center coincides with center of support. Central support abutting four peripheral cylinders of lower foundation step has four expanded parts with Dc.exp diameters determined as Dc.exp=(1.0-1.2)Dp.l. and cylindrical bore having diameter Dp.up determined as Dp.up=(0.6-0.8)Dp.l.. Foundation bottom is 0.7 m below ground surface. Foundation erection method involves forming drilled pile sections; serially drilling wells having daug.1 diameters as each peripheral cylinder having Dp.l. is forming; creating each peripheral cylinder having height equal to Dp.l. by supplying working material for above cylinder forming; filling remainder well section with ground material, particularly with ground excavated from above object. Auger having diameter, which provides necessary Dp.l. diameter is used. The auger provides usage of technological processes, which provides 1.05-1.1 increase of pile diameter in comparison with auger diameter daug.1 and 1.1-1.2 increase of ground pile diameter in comparison with daug.1 diameter. After four peripheral cylinders of lower foundation step creation well having daug.2 diameter is drilled by means of direct auger rotation and ground excavation to day surface. The well has center coinciding with central support center and depth selected so that the well reach tops pf peripheral lower step cylinders. Then lower expanded part of central support is formed, wherein the expanded part has expansion degree Bc.exp./daug.2 equal to 1.5-2.0. During cylindrical bore drilling the expanded part has expansion degree Dp.up/daug.2 equal to 1.2-1.5.
EFFECT: increased load-bearing capacity per foundation volume unit, extended field of technical means.
3 cl, 4 dwg
FIELD: construction, particularly to erect foundations in natural base.
SUBSTANCE: method involves driving pair of members pivotally connected with each other and provided with single bevels at lower ends thereof in ground; digging-out trench; installing guiding member on trench bottom; forcing plate members in ground up to plate members abutting upon guiding member and closing of beveled upper ends thereof; installing the similar pair of members having lengths exceeding that of the first pair in trench; driving above pair in ground up to upper beveled ends closing; concreting the trench.
EFFECT: increased load-bearing capacity of the foundation due to inclined members embedding and ground compaction under foundation bottom.
FIELD: construction, particularly to erect multistory buildings on non-uniformly compressible clay base.
SUBSTANCE: method involves excavating crossing trenches in ground; filling the trenches with concrete and joining thereof with slab covering the trenches. Trenches are excavated from pit bottom for different depths. Lower trench parts are provided with widened abutment sections having reinforcement bars included therein. The reinforcement bars are used as non-stretched threads. Trenches and slab are reinforced with nettings. Cell centers of the slab are anchored.
EFFECT: increased rigidity of foundation slab due to provision of ribs in ground.
FIELD: construction, particularly to erect foundations on natural bases.
SUBSTANCE: shallow foundation comprises support mats and foundation building blocks. Support mats have through orifices along mat perimeters. Upper parts thereof have extensions shaped as truncated cones and adapted to immerse piles in ground as load increases during structure overbuilding.
EFFECT: increased load-bearing ability.
FIELD: construction, particularly to reconstruct buildings and building structures.
SUBSTANCE: foundation comprises supports, sheath freely formed in ground inside area defined by foundation so that convexity thereof faces upwards and connected to supports by means of flexible ties. Cement mix layer, metal arch trusses and reinforced concrete layer are serially arranged on ground inside area defined by foundation. Metal sheets are laid on arch trusses and connected with each other through welded joints to create flexible sheath. Pre-stressed flexible ties inserted in through support orifices and provided with fixing anchors are placed over the sheath. In the second embodiment foundation comprises support, sheath freely arranged in ground inside area defined by foundation so that convexity thereof faces upwards and connected to supports by means of flexible ties. Ground mix layer reinforced with cement mix, metal sheets and reinforced concrete layer are serially located on ground inside area defined by foundation. Metal sheets are bent along predetermined profile and connected with each other to create sheath. Relaxed flexible ties inserted in through support orifices and provided with fixing anchors are placed over the sheath.
EFFECT: increased operational reliability.
4 cl, 1 dwg, 1 ex
FIELD: construction, surface mounted structures.
SUBSTANCE: invention pertains to construction and can be used when erecting buildings with considerable loading on a compressed clay bed. The technique for erecting a solid core foundation slab with closed vertical walls, directed downwards, involves designing a foundation pit, trenches, reinforcing them with frames and filling with concrete, and joining the surface with a slab. The trenches are dug from the bottom of the foundation with different depths. The trenches are then joined, thereby forming several closed contours, whose depth increases from the central part of the slab to the edges. The technical outcome is increase in strength of the foundation slab due to effect of the square shaped closed edges in the ground.
EFFECT: increased strength of the foundation slab.
FIELD: constructional engineering.
SUBSTANCE: invention refers to constructions on heaving soils. House footing based on freezing through soils includes a rigid body with flanges and indents from soil side, footing indent inserts made of heat-insulating material, e.g. polystyrene foam at such ratio of flange and footing indent areas that soil pressure from the lower flange surface is not less than standard pressure of frost soil heaving, soil pressure from the lower insert surface is not exceeding design compression resistance of insert material. Also, the said footing contains supplementary heat insulation laid outside of the footing. The upper edge of supplementary heat insulation is passed from external edge of the footing in the form of interrupted inserts through rigid body of the footing and connected to supplementary heat insulation of opposite external edge of the footing. Relative area of interrupted inserts (β=Aint.ins./A0) is given by the relation β≤1-σmax/R, where Aint.ins. is sectional area of interrupted inserts, m2, A0 is gross sectional area of the footing within inserts arrangement regions, m2, σmax is maximum external load pressure in footing material, MPa, R is design resistance of footing material, MPa. Indents and flanges of the footing from soil side are alternating along footing length. Indents centres from soil sides are provided under interrupted inserts centres of supplementary heat insulation from each external edge of the footing.
EFFECT: possibility to lay foundation above the design depth of heaving soil frost penetration level.
4 dwg, 1 tbl
SUBSTANCE: invention refers to construction of the basements of buildings. The basement structure of a building includes heat - and waterproofing layer (17, 18, 40) which is laid on a flat horizontal surface (51) layer of the material breaking capillary action. The basement structure includes a frame (31) which surrounds specified heat - and waterproofing layer (17, 18, 40), at least, in its top part, thus fixing integrity of basement structure in a horizontal plane and which serves for punctiform bracing of the building supported by basement structure. The specified basement structure is encapsulated with foil (111) from a metal material.
EFFECT: prevention of smell penetration in a building and water-proofing maintenance; possibility of fast and energy conserving erection of the basement.
8 cl, 8 dwg