Bored cast-in-place stepped foundation and erection method

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

 

The invention relates to the field of construction, can be used for the construction of butobetonnyh foundations of high bearing capacity, including foundations with marks soles, characteristic parts of shallow foundations.

Known design and method of construction of bored piles (Sorochan E.A. Foundations of industrial buildings. - M.: stroiizdat, 1986. - Pp.92-129). It was arranged by the drilling machine type-2 having set screws with a diameter of 600 mm and Widener circular steps with a diameter of 1600 mm. Such foundations are less time-consuming to manufacture - cast concrete, fill the drilled cavity, they are more economical compared with shallow foundations) - involves both horizontal and inclined support surface, and side surfaces in contact with the natural undisturbed soil. But the same technology is organically bound and the consequent disadvantages: the soil around the Foundation remains unconsolidated, the magnitude of the calculated resistance of the soil base is defined the same as for shallow foundations - in most cases the resistance under the lower end of the pile is substantially larger than the estimated resistance of the soil.

The closest achievable technical results of the performed action, the means of the m and the equipment is screw the method of construction of bored piles (Patent RU №2135691. The method of construction of bored piles. Buggily) and the pile is built on this technology. The method includes forming a bore in a reverse rotation of the screw shell under load its pressure, which helps to seal the borehole wall, the submission of a work material through the wellhead during the reverse rotation of the screw shell, the seal of the working material during the reverse rotation of the screw shell, removing the screw shell is produced when the load of the pressure by pushing him from a well condensed working material. Significant technological parameters, contributing to increased bearing capacity of bored piles, is that the diameter bored piles DStexceeds the initial borehole diameter equal to the diameter of the auger column dn.1.1÷2.5 times. It depends on the values of vertical pressure to be transmitted through the auger column formed on bored pile, and the resistance of the surrounding soil expansion piles. The expansion of the diameter bored piles leads to soil compaction in Messina space, to the emergence of radial "technological" stresses in Messina space and on the lateral surface of the pile. This leads to increased friction between the pile and the surrounding soil, which increases its load-carrying ability (With Omarov VG Reconstruction and construction of cities in the North Caucasus: the device ground and concrete piles auger method in ground subsidence//Reconstruction of historical cities and geotechnical construction: Tr. The Intern. proc. on geotechnical engineering, dedicated to the 300th anniversary of St. Petersburg. - SPb, 17-19 September 2003, Vol. 2. S.219-222). Their load-carrying capacity as that of piles vibrostamping and arranged by immersing inventory of pipes with a lost Shoe (PA, b SNiP 2.02.03-85*. Pile foundations)will be higher than other types of bored piles, which are surrounding the pile to the soil is compacted to a lesser extent or not at all compacted.

As a working material in the Method of construction of bored piles" use gravel and/or gravel and/or dry bulk loam, and/or concrete solution, and/or sand.

This method has the following disadvantages. With constant cross-section of bored piles is small specific load-bearing capacity of the pile (in terms of unit volume of material piles), to increase specific load-carrying capacity of the piles and increase the loads that can be perceived by the Foundation, it is necessary to increase the share of vertical loads transmitted through the lower ends of the bored piles. Concrete piles are not recommended for use in water-saturated clay soils, and seismic areas is Oh; therefore, the scope of such piles is limited.

Technical result achieved during the implementation of the claimed invention is to increase the bearing capacity of the piles and increase the loads that can be perceived by the Foundation, expanding the scope of the Foundation, including the installation of foundations with marks soles, characteristic parts of shallow foundations.

This technical result is achieved by the fact that in the proposed Foundation of the lower level consists of four peripheral cylinder of diameter Dsunand the same height, the centers of which are located at the vertices of a square with the size of the side of the Dsunand the center of the square coincides with the center support; the Central support, based on four peripheral cylinder the lower level has a lower extended part of diameter Dcouch.=(1,0...1,2)Dsunand a cylindrical shaft with a diameter of DSUV=(0,6...0,8) Dswoosh.; the edges of the Foundation is 0.7 m below the ground surface. To achieve the technical result as a working material four peripheral cylinders and the Central support used cement-sand mixture and/or cement-sand mixture with distributed volume segments of reinforcing filaments, providing a dispersion of armero is W; and/or dry concrete mix and/or dry concrete mix distributed by volume by segments of reinforcing filaments, providing dispersed reinforcement; and/or hard concrete solution distributed by volume by segments of reinforcing filaments, providing dispersed reinforcement. The method of construction of bored stepped Foundation includes the formation of four peripheral cylinder of diameter Dsunwhat turns proburivaya bore diameter dSNformed by filing a working material of these cylinders, each of the peripheral cylinder height Dsun; and the remainder of the hole is filled with soil material, which can be used and the soil from the object, taking the auger such diameter that to achieve the required diameter Dsunto use techniques that allow minimally - 1.05÷1.1 times to increase the diameter of the pile compared to the screw diameter dSNand 1.1÷1.2 times compared to the dSNto increase the diameter of the soil piles, and after the formation of the four peripheral cylinder lower stage proburivaya by forward rotation and extraction of soil on the surface of the borehole with a diameter of dSNwith the center coinciding with the center of the Central support, the depth to the top of the PE ivering cylinder lower level is formed in the lower extended part of the Central support, the formation of which achieve the degree of expansion of this area of the Dcouch/dSNfrom 1.5 to 2.0, and in the formation of the cylindrical barrel, the degree of expansion of this area of the pile DSUV/dSN- from 1.2 to 1.5.

Figure 1 shows the design of bored stepped base, side view.

Figure 2 shows a plan bored stepped Foundation.

Figure 3 shows the stage of constructing the peripheral lower cylinder stage (section A-a in figure 2): the left shows the erected concrete cylinder the lower level, above which the well is filled with soil material; the right shows the process of laying concrete located diagonally peripheral cylinder lower level will fill the well with local soil.

Figure 4 (section a-a in figure 2) shows the stage of construction of the Central supports are erected its extended part, commenced the erection of a reinforced concrete core support.

Construction of bored stepped Foundation (figure 1 and 2), consisting of the four cylinders of the lower stage 1, the widened part of the Central support 2 and the Central shaft 3, characterized by the fact that in the transfer of vertical loads in his body will be dominated by compressive stresses (rigid Foundation) and by calculation of the reinforcement metropulse. When using distributed over the volume of strands of reinforcing fibers, providing dispersed reinforcement (thread steel cable length from 20 to 30 mm when applying a hard concrete or dry concrete mixture, consisting of crushed stone fines, sand and cement or filaments of molten basalt length of 15÷20 mm when using cement-sand mixture), foundations can be applied in water-saturated clay soils in seismic areas. Thus significantly in comparison with the prototype extends the scope of the foundations. When forming sections of stepped Foundation 1÷3 using cement-sand mixture and/or cement-sand mixture with distributed volume segments of reinforcing filaments, providing dispersed reinforcement; and/or dry concrete mix and/or dry concrete mix distributed by volume by segments of reinforcing threads, providing the dispersed reinforcing, cement hydration will occur due to the pore water migrating from soil to cement in specified initially dry mixtures. It is known that the strength of concrete increases significantly if the amount of water does not exceed necessary for hydration of cement and frequent increase in water-cement ratio in concrete solutions compared to required is dictated by the fact that still the concrete mix is easier to condense traditional methods (for example, the vibration). In addition, the cost of dry concrete or cement-sand mixture is lower than conventional concrete solution. The use of these dry mixes and gives techological advantages: when drilling wells under the Central support required depth will be controlled to rise to the surface dry concrete mix from the lower cylinder stage 1, it would ensure the reliability mates widened part of the Central support 2 and the cylinder lower stage 1. The location of the edges of the Foundation on top of the cylindrical barrel 3 Central support - 0.7 m below the ground surface due to screw technology: the thickness of the buffer (unconsolidated) layer working material is in the range of 0.5 to 0.7 m

The sequence of erection of four cylindrical supports 1 low-speed (figure 2 and 3): screw column 4 proburivaya bore 5 with a diameter of dSN(under normal drilling with the rise of ground on the surface) to the soles of cylindrical supports 1 low-speed, then (as in the prototype - patent RU No. 2135691. The method of construction of bored piles /Buggily) during the reverse rotation of the auger column and the transfer of vertical pressure is applied and compacted work material 6 base. After the construction of the cylindrical support 1 at full height in the well served clay material 7, this mod is et to be ground with this object. When the seal is formed a plot of dirt piles 8 with the density of the skeleton of the soil, greater than the density of natural soil. Implementation of four parcels of ground piles 8 required (Fig 3 and 4): in their absence, the construction of the Central bearing device of the bore 9, the construction of the widened part of the Central support 2 and the cylindrical barrel 3 will become impossible. During the construction of the Central support (positions 2 and 3) proburivaya bore 9 with a diameter of dSNthe depth to the top periphery of the cylinder 1. When they run out of dry cement and sand mixture or dry concrete mix additional sign of reaching the required depth is 9 will be the beginning of the rise to the soil surface of these working papers 6. When forming the widened part of the Central support 2 achieve the degree of expansion of this area of the Dcouch/dSNfrom 1.5 to 2.0, and in the formation of a cylindrical barrel 3, the degree of expansion of this area of the pile DSUV/dSN- from 1.2 to 1.5 (see figure 4).

1. Bored stepped Foundation, including lots of bored piles formed with the screw technology, characterized in that the lower level consists of four peripheral cylinder of diameter Dsunand the same height, the centers of which are located at the vertices of a square with the size of the sides of the D sunand the center of the square coincides with the center support; the Central support, based on four peripheral cylinder the lower level has a lower extended part of diameter Dcum.=(1,0-1,2)Dsunand a cylindrical shaft with a diameter of DSUV=(0.6 to 0.8)Dsun; the edges of the Foundation is 0.7 m below the ground surface.

2. Bored stepped Foundation according to claim 1, characterized in that as a working material four peripheral cylinders and the Central support used cement-sand mixture, and/or cement-sand mixture with distributed volume segments of reinforcing filaments, providing dispersed reinforcement, and/or dry concrete mix and/or dry concrete mix distributed by volume by segments of reinforcing filaments, providing dispersed reinforcement, and/or hard concrete solution distributed by volume by segments of reinforcing filaments, providing dispersed reinforcement.

3. The method of construction of bored stepped Foundation, including the formation of plots bored piles, characterized in that when forming the four peripheral cylinder of diameter Dsunalternately proburivaya bore diameter dSNformed by filing the working material of these cylinders, each of the peripheral cylinder height Dsvn and the remainder of the hole is filled with soil material, which can be used and the soil from the object, taking the auger such diameter that to achieve the required diameter Dsunto use techniques that allow minimally - 1.05-1.1 times to increase the diameter of the pile compared to the screw diameter dSNand 1.1-1.2 times as compared with the dSNto increase the diameter of the soil piles, and after the formation of the four peripheral cylinder lower stage proburivaya by forward rotation and extraction of soil on the surface of the borehole with a diameter of dSNwith the center coinciding with the center of the Central support, the depth to the top of the peripheral cylinders the lower level is formed by the lower extended part of the Central support, the formation of which achieve the degree of expansion of this area Incum/dSNfrom 1.5 to 2.0, and in the formation of the cylindrical barrel, the degree of expansion of this area of the pile DSUV/dSN- from 1.2 to 1.5.



 

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