SU924249A1 - Method for installation of caisson - Google Patents

Description

The invention relates to the construction · stvu and can be used in the construction of underground structures using the lowering well or caisson, immersed in a thixotropic shirt.

Opusk- immersion method is known well in ⁵ Nogo thixotropic shirt regulation roll during lowering of the ground part-corresponding location of the pit blade [1].

The disadvantage of this method is its non-’® effectiveness in the presence of layers of weak soils.

The closest to the proposed technical essence and attainable result is a method vozve- ¹⁵ Denia caisson comprising immersing it into the ground with simultaneous filling of the cavity between the well walls and the ground material containing bentonite suspension, and adjusting the viscosity thereof ..

In this method, the cavity of a thixotropic shirt is filled with a mixture

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gravel of a certain size with a bentonite suspension. After the well reaches a certain depth, the bentonite suspension is removed through an outlet in the lower part of the well, a thickener is mixed into it with a slower thickening rate, and then the space between the wall of the lower well and the ground is filled with this material [2].

The disadvantage of this method is the low productivity and complexity of the regulation of the viscosity of the material filling the space between the wall of the well and the ground.

The purpose of the invention is to increase the efficiency of immersion of the well and to prevent its roll.

This goal is achieved by the fact; that in the method of erecting an operating well, which includes immersing it in the ground while simultaneously filling the cavity between the walls of the well and the ground with a material containing a bentonite suspension, adjusting the material viscosity is carried out by placing electrodes in it, passing a constant electric current and removing the water collected on the cathode.

The method is as follows.

In the process of diving a well, the cavity between the soil and its wall is filled with a material containing a bentonite suspension. With the passage of the knife part of the well of soil layers lying obliquely, or layers of weak soils (flowing clay, loam, silt, etc.), a significant roll of the well or its spontaneous diving may occur. To prevent such emergency situations, electrodes are lowered into the cavity: anodes and cathodes. Metal rods (fittings, angles, etc.) of the corresponding cross section are used as anodes. The cathodes are perforated pipes. The anode and cathode electrodes are arranged in a thixotropic shirt in one row (alternately) at a distance of 6080 cm from each other. The number of electrodes, the depth of their lowering and the connection to the current source depend on the specific conditions of construction. To prevent a well roll, if there are strong ground on one side and weak ground on the other, electrodes are lowered at the site of contact of the knife with weak ground around the well perimeter and the thixotropic solution is electroprocessed. If the weak soils lie evenly under the well, the electrodes in a thixotropic shirt are placed evenly around its perimeter. Under the action of a constant electric field in the material of a thixotropic shirt, a directed movement of water from the anode to the cathode occurs, which is a water intake. Gathered water pumps out-? sya As a result of reducing the amount of water in the material thixotrop924249 4

Noah shirt is an increase in viscosity of the latter. For intensive water release, the voltage between opposite electrodes is assigned at the rate of 0.5 “1.0 V per 1 cm distance between them.

The required viscosity of the jacket material is achieved by varying the voltage between the electrodes and the duration of the transmission of electric current. The values of these parameters for specific construction conditions are determined on the basis of preliminary tests or design topics.

The use of the proposed method of immersion of the well in a thixotropic shirt as compared with the known one provides an increase in labor productivity due to the simple technology of regulating the viscosity of the material filling the thixotropic shirt.

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Claims (1)

Claim The method of erecting the sump well *, including immersing it in the ground while simultaneously filling the cavity between the walls of the well and the ground with a material containing a bentonite suspension, and adjusting its viscosity, characterized in that, in order to increase the efficiency of immersion of the lower well and prevent its roll , the viscosity of the material is controlled by placing electrodes in it, passing a direct electric current and removing water collected on the cathode.