A method of manufacturing a printed piles

 

(57) Abstract:

The invention relates to the construction, namely, technology ramming piles and can be used in the installation of pile foundations in the process of strengthening and reconstruction of existing or construction of new buildings and engineering structures. The inventive method of manufacturing a printed piles includes drilling a cylindrical hole, filling electrically driven hardening material, the execution of it high-voltage electric discharges a working spark gap and the rise in height of the well. What's new is that the drilling and subsequent extraction of the drill implement the sustainability of its walls and leaving at the bottom of the wells of the sludge layer, and the discharger before filing-curing electrically conductive material installed along the axis of the borehole to the layer of sludge and produce its depth through the layer of slurry to the borehole bottom while delivering high-voltage discharges and seal the borehole walls, and flow into a well-curing electrically conductive material start on the achievement gap borehole bottom and continue the flow of this material before retrieving tnica. 1 C. p. F.-ly, 9 Il.

The invention relates to the construction, namely, to the technology of producing piles in the borehole, and can be used in the installation of pile foundations in the process and reconstruction of existing or construction of new buildings and engineering structures.

A known method of manufacturing a printed piles and device for its implementation [1] includes installation of valves and flow of solid material in the previously traversed by pneumotropica the borehole diameter less than the diameter of the generated piles and subsequent compaction-curing material, and simultaneously with the installation of the valve hole extend over the entire height, and the flow of solid material is carried out in conjunction with the formation of the camouflet broadening by a series of high-voltage electrical discharges, the number of which is determined from the desired radius camouflage broadening, radius camouflage broadening one discharge, the intensity of accumulation of irreversible deformation of the soil, and the seal hardening material produced by the height of the well high-voltage discharges.

The disadvantages of this invention are the following: the difficulty and sometimes impossibility punching well because of the difficulty of removing the back from the well, the complexity of the accommodation on the very limited cross-sectional area of the punch of the reinforcement cage, hose solution, electrodes with a high voltage cable and the implementation of reliable electrical insulation of the electrodes and connections at a voltage of 6-8 kV.

As a prototype of the selected known technical solution of the method of manufacturing a printed piles [2] i.e., the object of the same purposes, with the invention the greatest number of common essential features.

The specified method of manufacturing a printed piles includes the drilling of wells, installation inventory electric spark gap, the flow in the well-curing electrically conductive material, an awakening of the high-voltage electrical discharges through the spark gap with a moving zone of excitation from the bottom up and the subsequent extraction of the discharger.

However, the prototype has significant drawbacks that do not allow us to fully exploit the advantages of the proposed technology, since it is not guaranteed the quality of the barrel and the abutment piles due to the heterogeneity of the material of the barrel, under the fifth pile remains sludge, which at high-voltage discharges are not sealed itself and does not allow to reliably ultimaserial trunk.

In the specified prototype after drilling a well to a predetermined depth in the bottom hole remains drilled the ground the height equal to the height of the drill bit, which is not lifted by the auger. In addition, when lifting the drill from the well height of the sludge layer grows due to the shedding of the soil with the drill, caving and vplyvania the borehole walls and filtering ground water from the surrounding soil. The thickness of the sludge layer can be up to 1-3 m depending on soil conditions and the depth of the well.

Flow into the well conductive hardening material with simultaneous excitation in him a high-voltage electric discharges a working spark gap leads to additional collapse of the soil walls of the well, mixing soil, sludge, and ground water from entering hardening conductive material and the formation of a mixture of native and unknown composition, density and properties. It is not possible to accurately estimate the bearing capacity of the pile in the strength of the material.

The sludge on the bottom of a well, locked the post above mixture elektroprovidnogo hardening material, soil and water and not pushed up, as it would happen with the arrival of more techie discharges, performed on the lower horizon, are produced in the sludge and almost not condense the surrounding soil Foundation.

High-voltage electrical discharges in the subsequent horizons form the pile shaft, but not homogeneous. Eventually formed the pile is supported on the slurry and subsequently by filtering the water from the slurry into the surrounding soil can get more vertical deformation and cause the reduced drag of the pile heel that will reduce the carrying capacity of the formed pile in the Foundation soil.

In deep wells, when the armature frame and rastvorovoda pipe compound and consist of sections of length equal to the length of the drill rod, the lowering is performed in stages with the consolidation of the omitted parts, the lifting of the drilling rod, the connection of the upper sections and the subsequent lowering to the bottom. This leads to an increase of time spent on production piles.

The present invention is to provide a novel method of manufacturing printed piles, which would allow to get a quality barrel and heel piles, high bearing capacity and strength of the material of the barrel, and would reduce the time izgotovlenie well, installation inventory electric spark gap, the flow in the well-curing electrically conductive material, the excitement in him a high-voltage electric discharges through a spark gap with a moving zone of excitation from the bottom up and the subsequent extraction of the spark gap, drilling and subsequent extraction of the drill implement the sustainability of its walls and leaving at the bottom of the wells of the sludge layer, and the discharger before filing-curing electrically conductive material installed along the axis of the borehole to the layer of sludge and produce its depth through the layer of slurry to the borehole bottom while delivering high-voltage discharges and seal the borehole walls, and flow into the well-curing electrically conductive material begin to achieve the discharger borehole bottom and continue the flow of this material before removing the spark gap from the well, and the excitation discharge is carried out at the overlap hardening material discharger.

In this case, removing the drilling Assembly can exercise slow the rise of the drilling string from the well when it is rotating at a slow speed.

Work discharger may coaxial ustanavlivaetsya.

This technical solution the whole set of essential distinctive features allows you to make ramming piles with high bearing capacity for the Foundation soil and the material strength of the piles due to the availability of the following operations:

ensuring the sustainability of the walls of the borehole from caving, which is achieved, for example, slow the rise of the drill from the bottom when it is rotating at a low speed. As a result of this borehole wall rubbing clay soil, raised from the lower layers, and become smoother, which reduces the possibility of their collapse, vplyvania and reduces the filtration of water from the surrounding soil into the well;

coaxial lowering and moving the working spark gap in the well allows you to create printed pile symmetrical with respect to the axis of the borehole, which is especially important in deep wells with large diameter;

execution of high-voltage electrical discharges in the lowering of a spark gap in the slurry without the concurrent filing of a conductive hardening of the material can be sealed to the walls of the well by the pressure of the discharge in a liquid medium, chop, stir and make more ohms hardening material, entering the borehole bottom;

submission conductive hardening material under pressure at the well bottom with reinforced walls and filled with a homogeneous dispersed and less dense mixture will allow you to eliminate it completely, providing filling the entire volume of the wells homogeneous hardening conductive material specified strength;

a series of high-voltage discharges only in a homogeneous conductive hardening the material with a permanent filling the cavity formed from the next discharge, the same material will significantly increase the diameter of the hole due to the compaction of soil in the bottom and sides, greatly increasing its strength characteristics. In the result, the formed pile will be in the soil, which will have a higher bearing capacity;

all the top high-voltage discharges are performed in a homogeneous hardening conductive material, extending the borehole wall and condensing downstream solution, increasing its density and strength and increasing its load bearing capacity of the material;

the simultaneous lowering of reinforcement cage with centered it work discharger pozwolenie piles especially in deep wells, additionally arises when the engagement of a spark gap for the transverse rods of the frame.

The present invention improves the existing scientific and technical level in the field of manufacturing printed piles, as are new operations and coordinated between all the operations of the method according to the impact on the elements of the production piles, for example, pre-cleaned well from cuttings, and then supported the homogeneity of the material from which made the pile.

In Fig. 1 shows the penetration of a cylindrical borehole drilling machine; Fig. 2 strengthening the borehole wall during the passage of the well; Fig. 3 the formation of sludge in the well; Fig. 4 coaxial bore, a lowering it working spark gap of Fig. 5 the beginning of the high-voltage electrical discharges in the sludge during the passage through it of the working spark gap of Fig. 6 the beginning of the feeder hardening conductive material while achieving a work discharger borehole bottom; and Fig. 7 high-voltage electrical discharges in conductive hardening the material after plugging them the height position of the working device in the well; Fig. 8 the new position of the working device in the well; Fig. 9 form ramming piles.

Upon reaching the desired depth drill 2 extracted from wells 1 with simultaneous hardening of the walls of the well 1 from collapse. For this to reach the specified depth of the drilling apparatus 2 informs the rotation at a slow speed and then begin to slowly raise the well 1. As a result, the projectile 2 erases the wall of the well 1 (Fig. 2).

However, the bottom hole is always a layer of sludge 3 (Fig. 3) height of 15-20 cm, which as extraction drilling string from the well increased to 1-3 m due to the fall of the drilled soil drill 2, the filtration of water and soil from the walls of the borehole 1.

After complete removal of the drill 2 wells 1 produce axial lowering of the discharger 4 rastvorovoda pipe 5 (Fig. 4) and a high-voltage cable 6, which are respectively connected to the electro-installation and grouting pump (not shown).

When entering the working spark gap 4 in the sludge 5 begin to apply high-voltage electrical discharges (VII discharger 4 is centered within the reinforcing cage and made them joint lowering into the well 1 to the bottom with the performance of high-voltage discharges in the slurry 3 (Fig. 1 for clarity, the armature frame not shown).

After reaching the discharger 4 hole 1 and run high-voltage discharges in the slurry 3 on the bottom on rastvorovoda pipe 5 serves under pressure hardening conductive material 7 in the lower part of the well 1, which begins to displace the lighter sludge 3 from well 1 (Fig. 6).

After displacement of the slurry 3 times the working spark gap 4 begin to produce high-voltage discharges on hole 1 (Fig. 7). From each category to dilate the walls of the borehole 1 by compacting the surrounding soil to the desired diameter. The cavity formed by the discharge around the electrodes immediately with a new conductive plastic hardening material 7 for the interval between discharges, so each subsequent discharge occurs in the hardening conductive material.

After performing a series of high-voltage discharges on hole 1 produce lift working spark gap 4 at the design height and perform a new series of high-voltage discharges (Fig. 8). The level of hardening material 7 should be above the working spark gap 4.

Such operation is repeated until the complete lifting work the overall capacity of the soil and the material of the barrel.

The proposed method for the manufacture of piles passed the practical test if the installation of pile foundations of a dwelling house in St. Petersburg, where it was applied piles with a length of 6.3 m, the initial borehole diameter 230 mm, as the base layer was used sand silt medium density water-saturated. High-voltage electrical discharges were performed with the following parameters: voltage 8 kV, capacity 1200 μf, the number of discharges at each horizon 15, the step of lifting the spark gap at a height of 400 mm Were tested piles static pressing load, which showed that the maximum load on the pile is up to 55 TC, which is substantially higher than other types of piles in a given geological conditions.

Conducted the drilling of piles on the depth axis and the coring diameter 55 mm, which showed the uniformity and density of the material of the pile shaft. This is achieved by the fact that when drilling a cylindrical bore provided the solidity of its walls from caving, work discharger lowered coaxially well up to her face and when driving it through the sludge was carried out by high voltage electrical discharges, which was further condensed the borehole wall and dispersible sludge that oblem after the spark gap of the bottom hole. High-voltage electrical discharges on the bottom and all upstream horizons were performed in hardening conductive material not previously complete exclusion of sludge above the working spark gap than was provided uniformity and strength of the material of the heel and the shaft ramming piles and good compaction of the soil under the heel.

Thus, the present invention shall be patentable.

Although in the above example of the invention, the fabrication of cylindrical piles, it can be used also for the manufacture of piles of other forms: cylindrical with broadening one or more levels, conical with a taper, increasing downwards or upwards and others. This is achieved by changing the amount of energy discharges and the number of digits on the horizons.

1. A method of MANUFACTURING a PRINTED PILES, including drilling, installation inventory electric spark gap, the flow in the well-curing electrically conductive material, the excitement in him a high-voltage electric discharges through a spark gap with a moving zone of excitation from the bottom up and the subsequent extraction of the spark gap, characterized in that the drilling IC the population at the bottom of the wells of the sludge layer, moreover, the discharger before filing-curing electrically conductive material installed along the axis of the borehole to the layer of sludge and produce its depth through the layer of slurry to the borehole bottom while delivering high-voltage discharges and seal the borehole walls, and flow into a well-curing electrically conductive material start on the achievement gap borehole bottom and continue the flow of this material before removing the spark gap from the well, and the excitation discharge is carried out at the overlap hardening material discharger.

2. The method according to p. 1, wherein removing the drill exercise by slowly lifting with simultaneous rotation at a low speed.

 

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