RU2754092C1 - Method for erecting bored surfaced piles and device for implementing the method - Google Patents

Abstract

FIELD: mining industry.

SUBSTANCE: invention relates to geotechnical construction, specifically to the construction of underground structures such as a bored pile or a “wall in the ground”. The method for erecting bored surfaced piles includes drilling a well, installing a thermal heater on a tubular rod in the bottom hole, filling the well with a dry mixture of binder and inert materials, melting the mixture with heat from the surface of the thermal heater and gradually melting the pile from the bottom up with the resulting melt of a hardening concrete composition. The thermoplastic mixture is melted by the heat of hot air, which is supplied under pressure through a blow pipe from a thermogenerator located near the wellhead to the bottom. The molten mixture is compacted using a vibrating device attached to the lower end of the blow pipe, and the blow pipe is moved up along the axis of the well, achieving a uniform melt and compaction of the mixture along the entire length of the pile.

EFFECT: providing increased strength and density of the trunk material, ensuring implementation in a wide range of soil conditions using cheap local inert aggregates and industrial waste with low consumption of combustible materials.

5 cl, 3 dwg

Description

The present invention relates to geotechnical construction, in particular to the construction of underground structures such as bored pile or "wall in the ground".

There is a known method of erecting drill piles from molten soil, in which a well is drilled, the walls are heated with the heat of gas burnt in the well, then they are filled in portions with soil, melting it with burning gas and creating a trunk from molten soil / 1 /.

The disadvantage of this method is the increased gas consumption, a narrow range of ground conditions for use.

A known method of erecting drill polymer concrete piles on a polyethylene binder / 2 /. The method consists of the following, sequentially performed operations. A pipe with a heat-resistant tip is lowered into a well drilled in the ground to the design depth, a combustible gas or liquid is supplied, the walls of the well are burned to a temperature above 800 ° C, then a mixture of waste polyethylene granules and inert material is fed, cold compressed air is supplied to maintain the combustion of polyethylene, partially polyethylene is burned and melted with this heat, which in the molten state forms a viscous mixture with an inert material. Gradually raising the compressed air pipe, they achieve uniform filling of the well with solidifying polymer concrete. The disadvantage of this method is the increased fuel consumption, since a significant amount of heat is spent on heating the soil; a narrow range of acceptable soil conditions, since the well must be dry and have stable walls.

A known method of manufacturing drill piles from sulfur concrete / 3 /. A reinforcing cage and inventory thermoelements are installed in the finished well, then a cold sulfur concrete mixture is poured. The heat of the thermoelements melts the mixture to a temperature of 130-150 ° C and the thermoelements are gradually removed from the well, leaving behind them a hot sulfur-concrete melt, which, after cooling, turns into concrete, forming a drill pile according to the shape and size of the well. The disadvantage of the method taken as a prototype is a high energy consumption, a significant part of which is dissipated into the surrounding soil; low productivity caused by the low thermal conductivity of the mixture; poor quality of the pile material caused by the high porosity of sulfur concrete due to the lack of vibration compaction.

The technical result of the invention is to eliminate the shortcomings of the prototype and to solve some environmental problems by creating a method for erecting a drill pile of increased strength and density of the trunk material, which is implemented in a wide range of soil conditions; from concrete on cementless binder; on cheap local aggregates and industrial waste; with low consumption of combustible materials.

The technical result is achieved due to the fact that in the method of erecting drilling fused piles, including drilling a well, installing a thermal heater on a tubular rod in the bottom hole, filling the well with a dry mixture of a binder and inert materials, melting the mixture with heat from the surface of the thermal heater and gradually melting the pile from bottom to top with the resulting melt hardening concrete composition, according to the technical solution, the thermoplastic mixture is melted by the heat of hot air, which is supplied under pressure through a blow tube from a thermogenerator located near the wellhead to the bottomhole. The molten mixture is compacted using a vibrating device attached to the lower end of the blast tube, and the blast tube is moved upward along the borehole axis, achieving uniform melt and compaction of the mixture along the entire length of the pile.

The pile shaft can be made of a thermoplastic material such as sulfur or sulfur-containing waste products. At the same time, if it is necessary to ensure the incombustibility of the upper part of the pile, after the gray-concrete part of the trunk has cooled, the head of the pile at a length of 3-5 diameters can be made of reinforced concrete.

In addition, the pile shaft can be made of polymer concrete, the binder of which is plastic processing products, waste of inert materials.

Also, the technical result is achieved due to the fact that the device for the construction of bored piles, including inventory thermoelements on a tubular rod, according to the technical solution, contains a compressed air thermogenerator located on the surface near the wellhead, equipped with a blast well pipe, to the lower end of which is attached a pneumatic seal, powered by hot air supplied to the well, and a temperature sensor.

The essence of the invention is illustrated by drawings, where Fig. 1 shows a diagram of the installation of the device before the start of fusion, FIG. 2 shows a diagram of the process of fusion of the pile shaft; Fig. 3 shows the finished pile.

The proposed method is implemented in the following technological sequence. Well 1 is drilled at the construction site with known geotechnical equipment for drilling pile 11 of design diameter and depth. The walls of the well are reinforced with inventory metal casing pipes 2. The reinforcement cage 3 is immersed into the wells to the design depth and the blowing pipe 4 to the bottom of the well, a vibrator 5 is mounted on the pipe 4 to compact the melt 10 of the mixture 8, which is poured into well 1 in the last turn.

Then, the process of fusing the pile 11 begins. For this, hot air with a temperature of 150-170 ° C is supplied to the mixture 8 through the blow tube 4 from the thermogenerator 7. The mixture is gradually heated by air, which rises through the voids and cavities of the loose bulk material up the well. At the bottom of the well, dry mixture 8 begins to melt and turns into hot melt 10. Vibrator 5, attached to the lower end of pipe 4, compresses melt 10, and temperature sensor 6 signals unacceptable overheating temperatures. The pipe 4 is lifted along the axis of the well 1, achieving a uniform melt and compaction of the mixture 10 along the entire length of the pile 11. Temperature sensor 6 is required to control the melting mode and economical energy consumption.

If the well is shallow, the mixture is poured to the full depth. If the well is deep, the mixture is poured to a part of the depth, and in the process of fusion, cold mixture 8 is poured into the wellhead 1 from the reserve bunker 9.

The device for implementing the method includes a thermogenerator 7, a blow pipe 4, a temperature sensor 6 and a vibrator 5. The heater is installed near the well 1 under the pile 11 and connected to the blow pipe with flexible hoses.

To eliminate the risk of accidental ignition of the mixture in the well, the blast system is equipped with a switch for supplying air to the well or an emergency cylinder of compressed nitrogen or carbon dioxide.

An example of implementation of the method No. 1. Gray concrete pile.

A well is drilled in macroporous loess-like loams with known technological equipment for a drilling pile 24 m long, 40-120 cm in diameter. The groundwater level is at a depth of 10 m, therefore, the well is cased with inventory metal pipes.

A metal or composite reinforcement cage, a blast pipe with a vibrator are installed in the finished well, then the well is filled with a concrete mixture, for example, a dry sulfur concrete mixture. The mixture is prepared on site or brought from dry mix factories. The casing is then removed and the pile fusion process begins.

Hot air from the thermogenerator through the blast tube enters the bottom of the well and begins to warm up the mixture. The spent cooling air comes out to the surface into the atmosphere or is taken for reuse and sent to the thermogenerator.

When a certain temperature is reached, the mixture in the bottomhole melts, which is signaled by the sensor, the blast pipe with a working vibrator begins to rise upward, melting the mixture in the next interval of the well. Further - in the same order.

Loose bulk mixture as it melts and vibrates, settles, decreasing in volume. An additional portion of the mixture is poured from the wellhead bunker.

If it is necessary to ensure the fireproofness of the upper part of the pile, the head of the pile can be made of ordinary concrete, after the sulfur-concrete part of the trunk has cooled.

An example of implementation of the method No. 2. Polymer concrete pile.

Unlike example No. 1, the well is backfilled with a mixture of plastic waste, for example, polyethylene, and inert materials, for example, oily silica gel, broken glass, etc., and the pile melting process is carried out in a similar technological sequence.

Sources of information:

1. Inventor's certificate No. 342996 "Method for the manufacture of soil piles", IPC: E02D 7/00, E21C 21/00, publ. 06/22/1972, bul. No. 20.

2. Inventor's certificate No. 773189 "Method of manufacturing rammed piles", IPC: E02D 5/36, publ. 23.10.80, bul. No. 39.

3. Application №2020134594 Method of producing sulfur concrete and products from sulfur concrete.

Claims (5)

1. A method of erecting drilling fused piles, including drilling a well, installing a thermal heater on a tubular rod in the bottomhole, filling the well with a dry mixture of a binder and inert materials, melting the mixture with heat from the surface of a thermal heater and gradually melting the pile from the bottom up with the resulting melt of a hardening concrete composition, which differs in that, that the thermoplastic mixture is melted by the heat of hot air, which is supplied under pressure through a blow tube from a thermogenerator located near the wellhead to the bottomhole, the molten mixture is compacted using a vibrating device attached to the lower end of the blow tube, and the blow tube is moved upward along the axis of the well, achieving a uniform melt and compaction of the mixture along the entire length of the pile. 2. A method according to claim 1, characterized in that a thermoplastic material is used as a binder, for example sulfur or sulfur-containing production wastes. 3. The method according to PP. 1 and 2, characterized in that after the gray-concrete part of the trunk has cooled, the upper part of the pile at a length of 3-5 diameters can be made of reinforced concrete. 4. The method according to claim 1, characterized in that the products of processing of plastics, waste of inert materials are used as the binder. 5. A device for the erection of drilling fused piles, including inventory thermoelements on a tubular rod, characterized in that it contains a compressed air thermogenerator located on the surface near the wellhead, equipped with a blast well pipe, to the lower end of which a pneumatic seal is attached, operating from the hot air, and a temperature sensor.

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