SU1399394A1 - Method of constructing a sinkable well - Google Patents

Abstract

The invention relates to the construction, in particular to the construction of subsidence wells, and reduces the energy intensity of their construction and provides resistance to ascending. The method of erecting a manhole includes immersing the shell 1 as the soil is dredged from its internal cavity while simultaneously draining. Upon reaching the design position by the casing 1, a drainage layer 3 is laid on the ground 2 and a sump 4 is erected with the suction pipe 5 placed therein, after which the bottom 6 is formed by laying a concrete pad and the ground water is pumped out by the bottom 7 Simultaneously with the formation of the bottom 6 in the cavity of the shell 1, a tank 8 for groundwater is mounted and connected to the sump with a pipe 9 with a locking device 10, and after the concrete has been set by the bottom 6 of the design strength, they block the locking device about 11 of the suction pipe 5 is opened the locking device 10, repositioned pumps 7 in the level of the upper surface of the container 8 and carried out by pumping the ground water from the tank, the water level therein is maintained at a height from the bottom level of the bottom b defined by at reducible formula. Due to the fact that the required pressure is reduced when pumping water by pumps, the energy intensity of the construction is reduced, and the weight of water in the tank compensates for the pushing force. 1 il. i W

Description

OO CO

with so with so

The invention relates to an underground construction, namely to the construction of descending wells in water-saturated soils.

The purpose of the invention is to reduce the energy intensity of the construction of a well in water-saturated soils while ensuring stability ||

I The drawing shows an erected tower. A longitudinal section.

Iwell shell 1 is immersed as the soil is dredged from its internal cavity with C1 simultaneous drainage. Upon reaching the design position by the casing 1, a drainage layer 3 is placed on the ground 2 and a sump 4 is produced; the suction pipe 5 is placed in it, after which the bottom 6 is formed by laying a concrete sheath

sealing the space around the suction pipe 5 within it and pumping out the ground water by means of pumps 7 installed on the bottom 6. Simultaneously with the formation of the bottom 6 in the cavity of the shell 1, a tank 8 for the ground water is mounted and connected to the sump with pipe 9 the locking device 10, and after a set of concrete strength of the bottom 6 of the design strength, block the locking device

The suction pipe I1 5, the openings of the locks 10, the pumps 7 are moved to the level; the upper surface of the tank 8 and the groundwater is pumped out of the container, and the water level in it is maintained at the height of the bottom level - c |, a, b, equal to

I a

gr, е 2Q - weight of the well with the bottom, taking into account the strength of the well’s firing on the ground;

 K - coefficient of working conditions (K .25);

P is the outer radius of the well, m; Y is the specific weight of water, n / m. Observance of the latter condition (i.e., under the groundwater level outside the oiiycKHoro well at a height H from the level of the concrete pad 6) will prevent the discharge well from spontaneously ascending.

The volume of the tank 8 is prescribed, based on the need to provide time for the installation of the pump 7,

0

r

0

P

-zs

0

.with

five

where V is the volume of the tank

Q - water flow

T is the time required to rewire the pump, c.

Water pumping from level I with pump 7, located in position I, is performed during the time of installation of the internal equipment of the standpipe and construction of the above-ground part of the structure, after which the pumping of water is stopped.

Using this method allows to reduce the required pressure when pumping water by pumps and, thereby, to reduce the energy intensity of construction.

Claims (1)

Invention Formula The method of erecting an operating well, which includes immersing the casing as the soil is excavated from its internal cavity with simultaneous drainage, laying the drainage layer, erecting the sump with placing the suction line in it, forming the bottom by laying a concrete spout with sealing the space around the suction pipe within it and pumping out ground water with the help of pumps installed on the bottom, characterized in that, in order to reduce the energy intensity of the construction of a well in water-saturated soils with At the same time with the formation of the bottom in the shell cavity, the ground water tank is mounted and connected to the sump with a pipeline with a locking device, and after the concrete has been set to the bottom of the design strength, the pumps are moved to the level of the upper surface of the tank and the ground water is pumped out containers, and the water level in it is maintained at a height H from the bottom mark of the bottom equal to where 2P is the weight of the well with the bottom taking into account the forces friction of the well on the ground. I; / С - coefficient of working conditions, / С  1.25; Y is the outward radius of the well, m; y is the specific weight of water, I / m.