Method for building shallow foundation post having camouflet widened part

FIELD: building structures, particularly shallow foundations.

SUBSTANCE: method involves creating well by ground excavation, introducing preparatory portion of hardening material in well hollow including calculated part of hardening material; arranging explosive charge in lower well part; securing explosive charge; blowing explosive charge up to create cavity for widened foundation post part; crushing and widening above calculated part after explosion; introducing additional portion of hardening concrete in well up to 4/5 of well height; filling it with calculated part of above material portion. Concrete for casting is used as preparatory hardening material.

EFFECT: reduced time, increased simplicity of foundation building and reliability.

2 cl, 5 dwg

 

The invention relates to the field of construction and can be used in the device of shallow foundations designed for installation on them buildings and structures.

There is a method of Foundation construction, including the formation of wells by wyrmbane, education at the end of broadening its filling by trebovaniya rigid material, filling wells zatverdevanyy material (USSR, A.S. 1735494, MKI: E 02 D 27/32, 27/28, publ. 23.05.1992, bull. No. 19).

The reason that prevent obtaining the required technical result is the complexity of the method due to the necessity of the introduction of the reference block, and trebovaniya material in broadening, which increases the time of construction of the base.

There is a method of erecting a column of shallow foundations, including the education of the well-pit by vitramon soil, creating it the end of the broadening, filling broadening the concrete, filling the well extension portion in the form of a grasp of the concrete (USSR, A.S. 844692, MKI: E 02 D 27/01, publ. 07.07.1981 year).

The reason that prevent obtaining the required technical result is the complexity and duration of the implementation of this method, due to the creation and filling of broadening by trebovaniya hard concrete, as well as the lack of reliability is ity due to the presence of the boundary between the hard concrete broadening and grasp the concrete wells, that can lead to the embedding of the latter to the broadening. In addition, in the specified method is not provided reinforcement of the well.

A known method of construction of pier Foundation, including the formation of the well by excavation, creation at the end of its broadening, concreting broadening, introducing into the well an incremental portion of the concrete, the reinforcement wells (USSR, A.S. 1021713, MKI: E 02 D 5/34, 5/58, publ. 07.06.1983, bull. No. 21).

The reason that prevent obtaining the required technical result is the complexity and duration of the erection of the Foundation due to the necessity of introducing into the wellbore a supporting structure, and reduced carrying capacity due to the presence of the axial cavity in the concrete well and the lack of local seals in the field broadening. In addition, the erection in this way reinforced concrete structures involves the use of foundations, working on the curve and, consequently, on stretching, so that it can be used to build the foundations depth of not less than 5 m, and therefore cannot be used in shallow foundations.

The closest to the essence and the achieved technical result is a method of erecting a column of shallow foundations with camouflage widening, including sozdayuschiy by excavation, introduction into the cavity of the well prior portions of subsequently hardening material, including current portion, education at the end of the cavity broadening by placing at the bottom of the wells of the explosive charge and its subsequent explosion, collapse in broadening after the explosion of the computational part of the preliminary portions of subsequently hardening material, introducing into the well an incremental portion of hardening concrete (see, for example, D.A. Romanov Piles, deep foundations, Kiev, Gastrolyzer, 1959, s-228).

The task, which is aimed by the invention is a method of construction of shallow foundations with high bearing capacity and not requiring long and complex techniques and tools for the construction of such a Foundation.

The problem is solved due to the fact that the method of construction of the columnar shallow foundations with camouflage by expansion includes the creation of the well by excavation, introduction into the wells of the preliminary portions of subsequently hardening material, including current portion, education at the end of the cavity broadening by placing at the bottom of the wells of the explosive charge and its subsequent explosion, collapse in broadening after the explosion of the computational part of the preliminary portion of videomega later material, introduction in the hole extension portions hardening of the concrete, according to the invention the preliminary portion of subsequently hardening material is injected to a height of not more than 4/5 of the length of the borehole with subsequent filling of the estimated part of the given portion, formed after the explosion broadening, and before the explosion of the charge to produce a preliminary consolidation, and as a preliminary portions of subsequently hardening material used cast concrete.

Thus, before introduction into the well prior servings cast concrete can carry out reinforcement of the Foundation.

The technical result of the invention is to provide a method, based on the energy of the explosion, allowing for quicker filling broadening and accelerate the filling hole, to ensure the reliability of the method by increasing the bearing capacity of the Foundation by creating a monolithic docking border broadening and wells, as well as providing local seals in the area of broadening and solidity of the fill hole.

The essence of the proposed method of erection of the column of shallow foundations with camouflage by broadening is that the method includes the creation of the well by excavation, education at its end ening, filling broadening hardening material, suggesting the in-hole extension portions hardening of the material.

Process execution are illustrated in the drawings, which shows in:

figure 1 - well after the removal from it of the ground;

figure 2 - introduction into the well of the reinforcement cage and the explosive charge;

figure 3 - the introduction into the well prior portions of the concrete;

figure 4 - the collapse design of the concrete in broadening after the explosion;

5 - filling the borehole extension portion of concrete.

The method of construction of the columnar shallow foundations with camouflage widening involves excavation with the formation of wells 1 through excavation or through its vitramon, or, for example, helical drilling, using a tubular rod receiving rotation from the drilling rig (not shown), displacing and removing razryhlenie the ground. After rising to the surface and removal of the drilling unit formed in the cavity of the well is lowered charge of 2 explosives with electric detonators, United actuators 3 with an energy source (not shown)fixed at the bottom of the borehole, for example, by mounting on the reinforcement frame 4 is lowered into it. If necessary, ensures the tension of the reinforcement cage.

On customer request the reinforcement of the Foundation may not be, but in any case, the charge 2 shall be secured from SyteLine the bottom of a borehole to prevent the possibility of its subsequent upwelling in zatverdevaya material.

Then in the hole injection method, for example, a hose pump preliminary portion 5 zatverdevanie material, which can be used to cast the concrete mixture or liquid glass and the like, to a height of not more than 4/5 of the height of the well, after which a charge of 2 explosives undermine and under the power of the explosion is local soil compaction, resulting in it is formed camouflet broadening 6. At the same time the shock wave of the explosion acts on the column of concrete 5, located at the bottom of the well, raising it, whereupon he was under the influence of the weight falls from above into the formed cavity broadening, filling its volume. When such a shock occurs, additional compaction of the concrete, which increases the load-bearing characteristics and broadening the soles and post the remaining part of the preliminary portion of concrete 5, the calculation of which collapsed in the extension.

Fill the wells of the preliminary portion of the concrete to a height of not more than 4/5 due to the fact that when filling the well to a height of more than 4/5 and when exposed to the maximum calculated value of the energy of explosion of the concrete mix may spill on the surface of the earth that does not meet the conditions of safety, therefore to prevent such opportunities post pre portions bet is to not have, as shown by the experiment, to exceed 4/5 of the height of the well. In addition, above the need to fill the well to a height of not more than 4/5 due to the need for a reliable connection broadening from the wellbore, as well as a more effective impact of the explosion on the ground in the environment of liquid concrete, which fully uses the energy of the explosion, allowing not to take additional measures related to the compaction of the material.

Then is added into the cavity of the well extension portion 7 of the concrete to level the ground surface.

Calculation of the volume camouflage broadening is produced based on the difference between concrete columns before and after the explosion, but depending on the diameter of broadening and geological conditions calculated mass of the explosive charge.

On the basis of the total height of the shallow foundations of 1.6-2.0 m and the ratio of depth to width of base broadening adopted for shallow, 2:1 width camouflage broadening and the area compacted soil around it allows us to include these foundations to the type column of shallow foundations.

During implementation of the invention can achieve the specified technical result consists in speeding up and simplifying the known method according to the prototype, as well as improving the reliability for the et increase the bearing capacity of constructed shallow foundations, constructed claimed process is reflected in the use of well-known operations and techniques, as well as tools and commercially available materials, including at the level of functional generalization.

1. The method of construction of the columnar shallow foundations with camouflage widening, including the creation of the well by excavation, introduction into the wells of the preliminary portions of subsequently hardening material, including current portion, education at the end of the cavity broadening by placing at the bottom of the wells of the explosive charge and its subsequent explosion, collapse in broadening after the explosion of the computational part of the preliminary portions of subsequently hardening material, introducing into the well an incremental portion of hardening concrete, characterized in that the preliminary portion of subsequently hardening material is injected to a height of not more than 4/5 of the length of the borehole with subsequent filling of the estimated part of the given portion, formed after the explosion broadening and before the explosion of the charge to produce a preliminary consolidation, and as a preliminary portions of subsequently hardening material used cast concrete.

2. The method of construction of pier Foundation of claim 1, wherein prior to introduction into the well of the pre-molten portion is about concrete carry out reinforcement of the Foundation.



 

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