SU1203191A1 - Method of thermal consolidation of soil - Google Patents

Description

one

The image refers to the construction of buildings and structures on weak soils, in particular to their strengthening by thermal action, mainly in the form of a wall.

The purpose of the invention is to increase the efficiency.

Fig. 1 shows the soil to be reinforced by the wells and the placement of the equipment used and control means in a section; in fig. 2 location of wells and equipment b and 8 in the plan.

The process technology is as follows.

The main 1 and auxiliary 2 wells are formed in the soil linearly at distances equal to the width A of the reinforced soil as a wall 3 wells 1 and 2 are sealed with saTBOv 4, which are equipped with nozzles 5 on the main wells 1, and perforated outlets 6 connected to a vacuum pump 7. The nozzles 5 are connected to the tank 8 with the top biv and the compressor 9.

Then, the valves 10 feed the combustible mixtures into the main well I, burn them, vacuum the auxiliary wells 2 and heat the wall 3 on the outer layer II to a temperature of 0.7-0.9 calculated, for example, to eliminate the depth properties and m frost resistance of the reinforced soil massif - up to 540-420 C at a design temperature of 600 C; Simultaneously with the disconnection of the vacuum pump 7, the injection of heated gases 12 into the ground is stopped,

In the process of evacuating the auxiliary wells 2, the exhaust gases are fed into the filter 13 with preheating gel, they are dried in it and injected by the compressor 9 into the main wells 1 together with the fuel.

The control of the temperature field ocyv is implemented by a system of thermocouples 14 with self-recording instruments 15,

With this technology, the implementation of the method with the heating range of the outer layer 11 to 0.7-0.9 design temperature creates directional gas and heat flows that exclude the flow of gases to the limits of the reinforced soil in the form of a wall, the distance between wells 1 and 2, equal to the width wall 3, eliminates

91

unproductive heat sink outside the circuit.

The volume of soil to be reinforced by the proposed method is reduced in comparison with the known one by an amount determined from the dependence of

five

0 5

five

0 5

0

M 0.285 (1)

where H is the height of the reinforced soil.

According to (1), the reduction in the amount of work is 28.5%, which in turn reduces the cost of energy resources.

Reducing the heating temperature of the outer layer of the reinforced soil to 0.7-0.9 calculated gives the opportunity to use the effect of heat redistribution after burning, since the temperature of the walls of the auxiliary wells 2 and the soil between them and the main wells will be higher than the calculated thermal treatment of the soil.

Example. Thermal strengthening of the soil in the form of a wall 9 Mj in width I m in width and 4 m in depth was made on the construction mio junction. The soil is a surface loam with a temperature of elimination of the abundant properties of Tr 600 ° C. The main 1 and auxiliary 2 wells were drilled using the UGB-50 with a diameter of 0.2 m at a distance of 1 m from each other, each wall had 5 main and 4 auxiliary wells. Then they are sealed with valves 4 with nozzles 5 in main wells 1 and ne: perforated outlets 6 in auxiliary wells 2. Nozzles 3 are connected to fuel tank 3 and compressor 9 of type PKS-BM with a capacity of 15 m / min (when dismantling the second stage compression), and the outlets 6 - to the vacuum pump 7 of the RMK-4 type,

Combustion of combustible mixtures in the main well 1 with simultaneous packing of auxiliary wells 2, suction of wet gases and their drying in filters of FGT 13 and injection of compressor 9 into the main wells 1 was carried out while the temperature after 18 h on the outer layer 11 of the three strengthened; Walls 3 did not reach 540, 500 and 420 ° С, respectively, which was recorded by thermocouples 14 ТХА-ХШ with self-writing E1Sh-9M2 instruments of accuracy class 0.5 to 24 points.

After that, the source of combustible mixtures and the vacuum pump 7 are turned off without depressurization of the wells 1, 2, and compressed air is injected under pressure up to 0.2 MPa until the calculated temperature Tp reaches the outer layer 11 of the reinforced soil 3, which is also fixed readings of devices EPP EPP-9M2. The temperature redistribution process requires a sleep time; temperature redistribution in the wall, h

Performance indicators for 1 p / m

3

the volume of fortified soil, m consumption of liquid fuel, kg labor intensity, man-hours

203191

Responsible for each wall 2, 4 and 6 hours.

At the same time, the ground was strengthened by a known method. Comparative 5 analysis is given in the table.

The proposed method makes it possible to increase efficiency with a reduction in the cost of heat per 1 methane -17.1- 19.9 kg of liquid fuel, a reduction of 10 process performance by 5-12 hours and e-capacity by 3.5-5.3 man-hours.

4 4 4 31.1 30.2 28.9 8.9 9.8 10.7

VNIIPI Order 8393/35 Circulation 648 Subscription Branch PPP Patent, Uzhgorod, Proektna St., 4

Claims (1)

METHOD FOR THERMAL STRENGTHENING OF THE SOIL, mainly in the form of a wall, including the formation of the main and opposite auxiliary wells located from it, the sealing of the wells, the burning of combustible mixtures in the main well with the simultaneous evacuation of auxiliary wells and the injection of hot gases into the soil, characterized in that, for the purpose increasing efficiency, evacuation, and injection of hot gases lead to heating of the outer layer of the wall to a temperature equal to 0.7-0.9 calculated, after which they are introduced into nt compressed air until the temperature of the outer layer of the wall rises to the calculated one, and the distance between adjacent wells is taken equal to Q 0.66-0.76 of the estimated radius of soil reinforcement for a single well. A FIG. f