Production method for bored pile with enlarged footing

FIELD: construction, particularly bored piles with enlarged footing or enlargements at the bottom of the pile.

SUBSTANCE: method involves drilling well; filling the well with concrete mix and non-detonating composition including fuel and oxidizer; igniting non-detonating composition by applying low-voltage pulse to electric igniter and combusting non-detonating composition in deflagration regime to create camouflet void with following concrete mix hardening. The fuel is solid hydrocarbon selected from polyethylene, polypropylene and polystyrene. The oxidizer is sodium or potassium chlorate. Non-detonating composition is supplied in well before well filling with concrete mix.

EFFECT: decreased pile production time due to accelerated concrete mix hardening and improved produced pile quality.

6 cl

 

The invention relates to the field of construction and can be used in the manufacture of piles, in particular of bored piles with extended fifth.

A known method of manufacturing bored piles with extended fifth, including the drilling of wells under the pile, the descent to the bottom of the well a charge of explosives (he), filling the hole with concrete, blasting charge detonating explosive and education in the soil camouflage broadening of the lower end of the pile (Ganichev I.A. "the artificial Device of bases and foundations". M, stroiizdat, 1981, p.65) [1].

The disadvantage of this method is the prohibition of its use in the conditions of reconstruction, within existing facilities due to uncontrolled blast from the detonation of the seismic impact on surrounding objects and others

Closest to the invention in its essence and the achieved technical result is a method of manufacturing a bored pile with extended fifth, including the formation of the well, placing in her of the concrete mix and not detonating mixture comprising a fuel and an oxidizer, electric initiating ignition of not detonating mixture and burning it in deflagration mode with the formation of the camouflet cavity, curing the concrete mixture (patent RF №2221918, M CL E02D 5/34) [2].

The disadvantage of this method is complicated the awn equipment, necessary for its implementation, because the ignition is not detonating mixture requires a high-voltage electric discharge and, in addition, a complex structure has a device for feeding into the well itself is not explosive mixture.

The present invention is to simplify the method of manufacturing bored piles with extended fifth by simplifying the application process is not explosive mixture into the well, use the packaged charges not detonating mixture and simplify the electrical equipment through the use of a low voltage pulse to ignite the cartridge charges.

The technical result that can be obtained by using the method, is to reduce the manufacturing time bored piles with extended fifth by accelerating the hardening of the concrete mix, improve the quality of the fabricated piles.

The problem is solved due to the fact that in the method of manufacturing bored piles with extended fifth, including the formation of the well, placing in her of the concrete mix and not detonating mixture containing fuel and an oxidizer, electric initiating ignition of not detonating mixture and burning it in deflagration mode with the formation of the camouflet cavity and subsequent curing of the concrete mix, as fuel use solid angle is the hydrogen from the group: polyethylene, polypropylene, polystyrene, and the oxidant is sodium chlorate or potassium chlorate, accommodation in well detonating mixture in the form of one or more cartridges is carried out before submission of the concrete mix, and initiating ignition produced by the pulse low voltage on the electric igniter placed in each of the rounds.

It is advisable to be not detonating a mixture of aluminum powder.

Preferably the cartridges with no explosive mixture is well dispersed.

You can initiate firing ammunition with non-explosive mixture to produce not at the same time.

It is also possible one of the cartridges to be placed in the center well and make his initiation ahead compared to other cartridges that are placed on the periphery of the hole in its cross section.

In addition, perhaps one of the cartridges to be placed in the center well and make his initiation with a lag relative to the other charges that are placed on the periphery of the hole in its cross section.

The use of different variants of delayed initiation of cartridges that are posted on the sectional area of the well, allows you to adjust the exposure parameters generated by the combustion gases on the concrete and the surrounding rock to Paradise is not a place of bullets.

The proposed method for the manufacture of bored piles with extended fifth as follows.

Originally form the hole for the pile of the appropriate diameter. Depending on the soil, which form the well, the well may be formed by drilling or by puncture. Then into the hole on the cables down one or more charges in the form of bullets with no detonating mixture containing fuel and an oxidizer. As fuel use solid hydrocarbon from the group: polyethylene, polypropylene, polystyrene, and the oxidant is sodium chlorate or potassium chlorate. The mixture composition and the design of the charge in the form of a cartridge filled with oxidant surrounding hydrocarbon elements in the form of films or tubes, and provide a reaction of combustion of the composition in deflagration mode and the allocation of significant amounts of energy and gases. Firing bullets in a confined space occurs in the complete absence of soot, smoke, odor, as well as a powerful shock, seismic and acoustic waves.

After the descent into the well filled cartridges with no explosive mixture is produced filling the hole with concrete mix and carry out electrical initiating ignition of not detonating mixture.

As a power source for electrical initiation of pochana detonating mixture can be applied, for example, blasting machine condenser type. Guaranteed constant current operation for one of the electric igniter is 1.0 A. the Voltage supplied to the electric igniter may be in the range from 12 to 27 C.

After the electrical initiation of ignition of not detonating mixture is burning in deflagration mode with the formation of the camouflet cavity in the rock and subsequent filling of the cavity with concrete.

The sizes of the formed camouflet cavity are determined by preliminary calculations and depends on the load, which must bear the bored pile, and from the rocks in which its manufacture.

As the experiments showed, for education camouflage cavity in the rock, presents plastic clay, it takes about 2 g not detonating mixture of 1 DM3the resulting volume camouflage cavity. In heavy clay soil, the figure rises to 5 g/DM3.

With the additional introduction of not detonating a mixture of aluminum powder increases the temperature and rate of combustion is not detonating mixture and stronger cohesive rock type limestone this increase allows more efficient use of the emitted energy for the formation of the camouflet cavity.

The use of non-explosive mixture in view of the cartridges allows you to place the cartridges dispersed as by a transverse, and longitudinal section of the well. Due to the dispersion in cross-section well it is possible to adjust the work produced during the combustion gases and to direct various part of the energy of the gases on the seal surrounding the borehole rocks and seal the concrete mixture into the space well. Due to the dispersed placement of cartridges longitudinal section of hole it is possible to change the configuration of the camouflet cavity in longitudinal section of the well and, in addition, optionally, simultaneously produce several camouflage cavities distributed along the well.

Increasing the effectiveness of education camouflage cavity can be achieved with multi-temporal initiation of cartridges placed in the center of the cross section of the hole and its periphery.

To evaluate ways of doing work on the production of bored piles with extended fifth made two bored piles in the ground, presents plastic clay.

For tests used semantischen mixture composition, kg/m3compacted concrete:

cement400
the sand870
gravelwith fractions of 5-10 mm392
with fractions 10-20 mm478
water200

The first pile was made of the proposed method by placing a few bullets along the axis of the borehole. Ammo was charged composition containing polyethylene in the form of tubes in the amount of 11.6 wt.% and sodium chlorate - 88,4%by weight. The strength of concrete after 7 days was 17-19 MPa after 28 days - 32-34 MPa. The design concrete strength was reached after 140 days.

For comparison, in the manufacture of the second piles were used cartridges, the charged composition according to [2], comprising a paste of aluminum powder, nitrate and water. The strength of concrete after 7 days was 14-15 MPa after 28 days - 28 to 30 MPa. Design strength of concrete has been achieved through 175 days.

The obtained results are in good agreement with studies of the composition of the products of combustion do not detonating mixture according to the invention. It is established that in the intermediate products of combustion contain ions of Cl-, Na+and CO, CO2contributing to the acceleration of setting of concrete mixtures, reduce the time of curing and curing.

1. A method of manufacturing a bored pile with extended fifth, including the formation of the well, placing in her of the concrete mix and adetomyrma mixture containing fuel and an oxidizer, electric is the first initiation of ignition and combustion with the formation of the camouflet cavity and subsequent curing of the concrete mixture, characterized in that as fuel use solid hydrocarbon from the group: polyethylene, polypropylene, polystyrene, and the oxidant is sodium chlorate or potassium chlorate, accommodation in well adetomyrma mixture in the form of one or more cartridges is carried out before the concrete mix feeding, initiation of ignition produced by the pulse low voltage on the electric igniter and the combustion is carried out in deflagration mode.

2. The method according to claim 1, characterized in that nematodirus the mixture is further added aluminum powder.

3. The method according to claim 1, characterized in that the cartridges with adetomyrma mixture is placed in a well dispersed on its transverse and/or longitudinal section.

4. The method according to claim 3, characterized in that the initiation of firing cartridges with adetomyrma mixture produced simultaneously.

5. The method according to claim 4, characterized in that one of the cartridges is placed in the center well and produce his initiation ahead compared to other cartridges that are placed on the periphery of the hole in its cross section.

6. The method according to claim 4, characterized in that one of the cartridges is placed in the center well and produce his initiation with a lag relative to the other charges that are placed on the periphery of the hole in her cross the Ohm section.



 

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