Prefabricated foundation shell
SUBSTANCE: prefabricated foundation shell includes an external shell with an expansion in a lower part, resting against a board or a prepared foundation. The shell comprises flat trapezoidal boards installed vertically, as inclined with equal angles of boards inclination, and with the largest angle of boards inclination, which are opposite to direction of action of highest moment forces, or from jointly installed vertical and inclined boards. The inclined board is made at the opposite side of directing actions of highest moment forces and is parallel to the side of the support board. The joint of mutually crossing trapezoidal boards is made via vertical or inclined as arranged symmetrically to a slot in upper and lower parts of the boards by half of their height. All opposite composite trapezoidal boards have smaller size. In the upper part of the foundation a column base is made as through under single or double branch column.
EFFECT: increased bearing capacity, reduced labour intensiveness and material intensity.
2 cl, 8 dwg
The invention relates to the construction, in particular to the construction of prefabricated foundations-shells of industrial and civil buildings.
Known prefabricated Foundation glass type, under mnogovetvevye column, composite made from two types of mutually perpendicular flat plates mounted vertically and having cutouts along the axes of the branches of the columns .
The base design is not sufficient load capacity and complexity in the manufacture of composite elements, greater material consumption.
The closest technical solution to the proposed Foundation is a Foundation that includes an outer casing accommodating the filling material of different strength on the horizontal and vertical direction .
The disadvantage is the complexity of manufacturing of the Foundation, insufficient bearing capacity.
The purpose of the invention: increasing the carrying capacity, reducing the complexity of manufacture of the structural elements, reduces the time of installation and reduce material consumption.
This object is achieved in that the precast Foundation-shell comprising an outer shell with a widening in the lower part resting on the plate or the prepared base and holds the vertical and horizontal layers of material with different bulk density, and n�longer weight to the side, opposite to the direction of action of the greatest moment effort, the shell Foundation consists of a flat trapezoidal plates, upright and inclined at equal angles of inclination of the plates, and with the greatest angle of inclination of the plates opposite to the direction of action of the greatest moment effort, or jointly set vertical and inclined plates, wherein the inclined plate is made from the opposite side of the direction of the greatest moment effort and parallel to the side of the base plate. The junction of mutually intersecting trapezoidal plates is made through a vertical or inclined symmetrically arranged slots in the upper and lower parts of the plates to half their height, all of the overlying composite trapezoidal plates are smaller, and in the upper part of the Foundation podkolonnik is a through under one - or two-branch column.
Fig.1 shows a precast Foundation-shell with inclined plates, top view under odnopetlevye column; Fig.2 is a vertical sectional view of the Foundation d-D; Fig.3 - item plate with the lower vertical grooves; Fig.4 - element plate with the upper vertical grooves; Fig.5 element plate with the lower inclined grooves; Fig.6 - element top plate with slanted grooves; Fig.7 shows a precast Foundation-shell, top view under dohve�vewwy column; Fig.8 is a vertical sectional view of the Foundation e-E;
Precast Foundation-shell includes a base plate 1, the trapezoidal plates 2 and 3 with the bottom slits 4 and the upper slits 5, the filling material with a large volume weight of 6 and weighing less than 7.
Production technology of works on installation of the Foundation is carried out in the following sequence.
On the prepared substrate is mounted in a known manner precast base plate 1, with a crane mounted trapezoidal elements, plate 3 with a slot 5 is set in parallel, then perpendicular to them are mounted in the slot 5 of trapezoidal plate with 2 slits 4. The subsequent installation of trapezoidal plates similar. Then the inner part of the shell is filled with a material of the vertical layers of different weights.
The proposed design of the base allows to reduce the complexity of manufacturing, to significantly reduce installation time, reduce material consumption, improve the bearing capacity of the Foundation.
Sources of information
1. Copyright certificate of the USSR No. 140751, CL. 84, 2, 1961.
2. Patent RU №2367743, CL E02D, 2007.
1. Precast Foundation-shell comprising an outer shell with a widening in the lower part resting on the plate or the prepared substrate, characterized in that the shell consists of� of flat trapezoidal plates, upright and inclined at equal angles of inclination of the plates, and with the greatest angle of inclination of the plates opposite to the direction of action of the greatest moment effort, or jointly set vertical and inclined plates, wherein the inclined plate is made from the opposite side of the direction of the greatest moment effort and parallel to the side of the base plate, and the junction of mutually intersecting trapezoidal plates is made through a vertical or inclined symmetrically arranged slots in the upper and lower parts of the plates to half their height, all of the overlying composite trapezoidal plates are smaller, and at the top of the Foundation of podkolonnik is a through under one - or two-branch column.
2. Precast Foundation-shell according to claim 1, characterized in that placed on its vertical and horizontal layers of material with different bulk density, with the greatest weight to the side opposite to the direction of action of the greatest moment effort.
SUBSTANCE: invention relates to construction, in particular, to erection of prefabricated foundations of industrial and civil buildings. The prefabricated foundations includes flat trapezoidal boards that are mutually crossing. Crossing of two and more boards may be made at equal angles between boards, also with reduction of the angle in direction of high moment loads. Boards rest onto a cut in a support board. Trapezoidal boards are joined via a vertical slot in the middle part or made as displaced aside with lower moment forces, and a column base has slots for fixation.
EFFECT: increased bearing capacity, reduced material intensity and labour intensiveness.
2 cl, 6 dwg
SUBSTANCE: reinforced concrete board to erect non-submerged foundations is formed with a flat reinforced concrete structure. A flat reinforced concrete structure of a slab is made in the form of two beams crossing at the angle of 90°, and in the place of connection of beams there are curvilinear side vertical surfaces with radius of curvature, equal to 1.5 of beam width. The length of the beam is four times more than its width, at the same time the width of the beam is determined in accordance with the area of the pillar base.
EFFECT: reduced contact stresses in a system of foundation slab-soil base, reduced material intensity and labour intensiveness.
2 cl, 2 dwg
SUBSTANCE: invention relates to the construction of shallow foundations. Slab foundation, reinforced with recessed cage located outside the foundation along its perimeter at some distance from the edge of the plate. Deepening of the bottom of the cage exceeds the depth of maximum horizontal ground motions. The distance between the cage and the edge of the slab is set according to the planned design bearing capacity or settlement of the foundation and in the composite cage made of reinforced components their upper parts are connected by a belt.
EFFECT: technical result is the increase of the reliability and load-bearing capacity of the slab foundation, reduction of its settlement, reduction of material consumption.
8 cl, 9 dwg
SUBSTANCE: monolithic system of a base with a resistant composite coating from homopolymer having semi-continuous configuration comprises load-distributing elements for formation of seams. Comprises a base that includes blocks from polystyrene foam and a bearing semi-continuous cement-concrete coating, the formwork for which is formed by blocks from polystyrene foam that are part of the base. Load-distributing elements are made in the form of load-distributing plates. Each of load-distributing plates comprises two anchors with two reinforcement bars for setting the position of the seam shaper and a hinged joint made as capable of counterclockwise rotation under action of a support moment, developed by the load, and clockwise rotation under action of the support moment developed by load-distributing plates.
EFFECT: efficient operation of a base under action of various loads, reduced material intensity and labour intensiveness.
6 cl, 6 dwg
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
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
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