SU1325130A1 - Method of thermal consolidation of soil - Google Patents

Abstract

The invention relates to the reconstruction of buildings and structures on clay and loess soils by thermally fortifying them under the foundations of buildings and structures. The invention is aimed at improving efficiency. This is achieved by the fact that the formation of wells are uniformly along the longitudinal sides of the foundation. Sealing wells is carried out below the base of the basement at a distance from it, which is determined by the proposed mathematical dependence. A relationship is also proposed to determine the temperature gradient over time. 1 dw., 3 tab. with ND SP

Description

The invention relates to the construction and renovation of buildings and structures on clay and loess-like soils by means of TepMhwecKoi and fortification under the foundation materials; 1 building and structures.

and, the spruce of the invention is an improvement in efficiency.

The drawing shows a section of a reinforced array of soil and the foundation and shows the main equipment and means of process control

The technology of the method is as follows.

Initially, parallel to the procedural crcip: j-us, base 1 uniformly form boreholes 2, subsurface ix below iio / ioiiiBbi 3 of foundation 1 at a distance of H- (and the distance from the nose lines on the 4 sides of the baseline 1 and.) Is 141 „Iii CM wells) 2 seal the frog at the i In level from the basement of the nests with elongated 5 with elongated ({junction 6, connected to tank 7 for toplin and compresso () installation 8. After UT01-0, 2 combustible mixtures are fed into the wells and burn them while maintaining the constant temperature T, -, maintaining 9 temperature gradients in the fortified soil using thermocouples 10, connect HCHiihix with recording and using devices 11. as long as the temperature T (the evaporation of evaporation and: groundwater is equal to about 200 ° C, not up to 1 - no longitudinal axis 12 of the foundation:

2-T.K

l i-b- ()

D

g de 1 the temperature of the soil heating on the base axis of the foundation, C: a is the average rate of thermal shock

Renlen d) Unta, m / h, H - Chubina of the active part of the well, m; B - distance between axes of wells

11irine of the foundation, m; To the exponent of the n-mperedurea crine in reinforced soil.

Before burning in the wells of 2 combustible mixtures, iodine from the reinforced soil mass 9 is removed by vacuuming with vacuum pumps (iie shown) to the soil moisture at the border of rolling,

The distance from the bottom of the foundation 1 to the smooth sealing of the scaffold 2 is determined from dependencies

(- - R-b t.n- i, i .р

(2)

where T-.op is admissible ri-.the temperature of the heating of the material.1 ;: (| i idemei o by its lio.ioniBe, С ..

Example I. On the construction 1.:po-dan; xx, the construction of the foundation bases on loess macroporous soils is carried out. Natural R. 1.1. Soil 0.23. The transverse size of the foundation is 4 m.

: Bottom of laying the bottom of 3 m. Allowable temperature for prolonged heating of the concrete foundation according to the condition of preserving the coating waterproofing T.N.p 50 ° C. According to the calculation, it is necessary to increase the bearing capacity of the soil 2 times to the depth of the base of the foundation 5 m.

The technological parameters are as follows.

The depth of the wells is equal to 8 m, the temperature of the soil heating along the longitudinal axis of the foundation is accepted - according to the results of preliminary experiments equal to T 200 ° C.

The combustion temperature of combustible mixtures in wells at various K values is given in Table. one.

Table 1

T, from 280

400

800

The thickness of the protective layer for the maximum value of 2 4 according to (2) (when expressing the value of B in the size of the well’s radius 0.1 m) is 0.3 m. The sealing of the boreholes is taken at a level of 0.3 m from the basement, those. at 4.7 m from the bottom of the well.

The distance between the wells i; o the width of the basement: according to the OS B 2xO, 1 f-2X O, 3 +, 8 m, along the basement 2.4.

Temperature gradients in time for (1) for different values of K are given in Table. 2

table 2

dT., -, 0.59 a 1, 18. a 2.36. but

S / h

The values of the average rate of thermal strengthening of the soil (a) are determined for each specific case by experiment.

Example 2. According to the conditions of Example I, the soil is reinforced with a variation of K. The soil is preliminarily vacuumed to a moisture content at the rolling limit of 0.05.

The wells around the foundations are drilled by installing the UGB-50 with a diameter of 0.2 m to a depth of 8 m from the surface, at a distance along the wasps across the foundation (at 4.8 m and along the 2.4 m long line).

at 0.3 m from the sole 3. Experiments determine that the thermal hardening rate of the soil is 3.2 (at the T-200 ° C front after dehydration of the soil). Liquid fuel is burned with a heat of combustion of 42 MJ / kg through elongated nozzles; compressed air is generated with units with a capacity of up to 12-15 m / min.

ILiMT -.- ni, iiocTb process, h

The combustion temperature of combustible mixtures

° С

Specific heat consumption

: No. / M J

Heating to T 600 C provides the specified strength.

Thus, the proposed method makes it possible to reduce the consumption of thermal energy by 1.26-1.49 times, the duration of the process by 1.06 - 4.31 times.

Claims (1)

Invention Formula The method of thermal strengthening of the soil, mainly under the foundation of the building and structures, including the formation of wells, their gemetization, the evacuation of the soil to be strengthened through the wells with the removal of water from it, the generation of combustible gases in the wells and the heating of the soil by that, in order to increase the efficiency, the formation of wells are evenly distributed along the longitudinal sides of the basement, the bleeding of the wells is carried out below the base of the basement at a distance from it, which is determined and depending on The temperature of the soil is controlled by thermocouples and devices such as EPP-9M. The process continues until the soil is heated along the longitudinal axis of the foundation to 200 ° C. At the same time, similar work is performed by a known method. A comparative analysis of the experiments is given in table. 3 Table 3 106 53 26 280 400 800 2510 2730 2980 3750 about - i-i ;,  2 and the heating of the soil is not bad with a gradient of temperature. temperature in time determined by 5 dependencies T, -. 2T-C LI where Glom is the permissible temperature for heating the basement material at its sole, ° C; 0T - heating temperature rpyhta along the longitudinal axis of the foundation, C, D, a is the average rate of thermal strengthening of the soil, m / h; H-depth of active 4actH skmen, m; B — distance between the axes of the wells across the basement, m; K is an indicator of the degree of the temperature curve in the consolidated soil: Q (is the temperature of the generation of hot gases, ° С five