A method of lowering of the groundwater during the construction and operation of underground structures and device for its implementation

 

(57) Abstract:

The invention relates to the field of construction and relates to a method of lowering groundwater levels during construction and operation of underground structures located below the groundwater level. The method consists of pumping groundwater pump with suction and discharge pipes from the perforated pipes connected suction pipe of the pump. What's new is that the lowering of the groundwater produced within underground structures from each layer separately with the subsequent removal dehydrated layers of soil, and the construction of the bottom of the underground structures manufacture, placing on the gravel base below the level of the bottom of the perforated pipe and through the check valve pump is evacuated from the water before the construction of the bottom, erection of walls and to their full sealing pressure of groundwater, and the end of the suction pipe of the pump have above ground water level, the pump is disconnected from the suction pipe, a perforated tube is left in the environment groundwater below the bottom of the structure, and the suction pipe of the pump with the remnants of it concreted ground water in the body of underground structures, leaving the top output is. the device includes a pump with suction and discharge pipe, perforated pipe connected through a check valve with the lower end of the suction pipe. What's new is that the suction pipe concreted in the body structure, the upper end have a higher groundwater levels with the possibility of sealing and connection to the valve of the pump, and the perforated pipe is located horizontally below the level of the bottom of the underground structure along its length in the environment groundwater. Technical result provided by the invention is to improve the efficiency and reliability of the artificial lowering of groundwater levels during construction and operation of underground structures located below the groundwater level, and prevent extrusion of the soil has already been built and operated underground structures pressure alarm high groundwater. 2 c. and 2 C.p. f-crystals, 5 Il.

The invention relates to the field of construction and operation of subsurface in the earth structures located below the ground water table and is a complex technical problem solving, United in a single whole one inventive concept. what zemnogo structures by pumping the pump groundwater from the pit (sump), located below the building marks the bottom of the underground structures ("Reference master-Builder" edited korotyeyeva D., Moscow, stroiizdat, 1989, pp. 104-106).

The disadvantage of this method is that after the erection of the bottom of the underground structures, removed from a sump suction pump for concrete sump (sump), located in the bottom of the structure, but the strong pressure of ground water on the network to do it, and almost through the concrete sump (sump) inside underground structures are continually being added to the groundwater.

Closest to the invention is a method of lowering of the groundwater by pumping them pump with suction and discharge pipes from the perforated pipes connected through a check valve with the lower end of the suction pipe of the pump (see the description of the invention SU 1399394 A1, class E 02 D 27/18).

In the parts of the unit is the closest unit comprising the pump with the suction and pressure pipes, perforated pipe connected through a check valve with the lower end of the suction pipe (see the description of the invention SU 1399394 A1, class E 02 D 27/18).

The disadvantage of str is so pumped by another pump outside of the underground structure.

The present invention is to improve the efficiency and reliability of the artificial lowering of groundwater levels during construction and operation of underground structures located below the groundwater level, as well as preventing extrusion of the soil has already been built and operated underground structures pressure alarm high groundwater.

The task in part of the way is solved according to the invention due to the fact that the process involving the pumping of groundwater pump with suction and discharge pipes from the perforated pipes connected suction pipe of the pump, the construction of the underground facilities of the lowering of the groundwater level is produced in layers inside underground structures by pumping a pump ground water from each layer separately with the subsequent removal dehydrated layers of soil from underground structures. For the construction of the bottom of the underground structure along its length lay perforated pipe, through which the check valve is connected with a suction pipe of the pump, then turn the pump and produce the pumping of groundwater from a perforated pipe before lowering them below the level of the building atlasii from the pressure of the groundwater. The end of the suction pipe of the pump have above ground water level, the pump is then disconnected from the suction pipe, a perforated tube is left in the environment groundwater below the bottom of the structure, and the suction pipe of the pump with the remnants of it concreted ground water in the body of underground structures, leaving nezablokirovanne only the upper output the crown of the pipe with a valve, with the possibility of acceding to the pump.

In case of emergency high rise in groundwater levels and the threat of extrusion of the soil has already been built and operated underground structures, the valve upper output the crown of the suction pipe of the pump can again connect the pump to produce the pumping emergency high water until no evidence of extrusion underground structures. Control over the lower level alarm high groundwater to normal levels produced by opening the valve of the upper crown of the suction pipe when disconnected the pump, while ground water from the valve should not leak when it is opened, if the emergency high groundwater level decreased to normal levels.

In the part of the device, the problem is solved due to the fact that in the mouth of the first valve with the lower end of the suction pipe, after the construction of underground structures the upper end of the suction pipe of the pump necessarily have higher groundwater levels with the possibility of sealing and perforated tube fitted horizontally below the level of the bottom of the underground structure along its length in the environment, groundwater, and itself suction pipe with the remnants of it ground water must be concreted in the body buried well, for example in the vertical partition. Thus the top output the crown of the suction pipe with a gate valve may be inferred beyond the body of concrete underground structures with the ability to connect to the valve of the pump, for example, taken out of the body of concrete vertical walls recessed well.

Given a set of features provides the technical result, which is expressed in increasing the efficiency and reliability of the artificial lowering of groundwater levels during construction and operation of underground structures located below the groundwater level, as well as preventing extrusion of the soil has already been built and operated underground structures pressure alarm high groundwater.

The essence invented the dehydration of the soil inside underground structures. After dehydration the next layer of water-saturated soil, it is removed from underground structures and, if necessary, lower the body structure to the design elevation;

in Fig. 2 in schematic form of the device at the time of construction of the bottom of the underground facilities;

in Fig. 3 in schematic form presents underground construction after completion of construction with sealed suction pipe and concreted the upper end of the suction pipe of the pump in the body of the vertical walls of the construction;

in Fig. 4 in schematic form also presents underground structure with the possibility of joining the valve to the upper crown of the suction pipe for lowering abnormally high groundwater;

in Fig. 5 in schematic form presents underground construction, made in the form of a metal container, with the possibility of attaching a pump to the valves suction pipe for lowering groundwater levels.

A device for implementing the proposed method comprises a wall of the underground structure 1, imbedded in the soil with high groundwater level 2, inside of which dug a pit, covered with crushed stone 3, with pre which has a top output crown 7, the valve 8 with the pump 9, is attached to the discharge pipe 10.

When the pump 9 groundwater level 2 within the underground structure 1 is lowered to 11 ground water located below the level of the construction level of the bottom 12, which enables the construction work on the construction of the bottom 12, a vertical partition 13, the body of which remains concreted suction pipe 6 (see Fig. 2, 3).

Top output the crown 7 of the suction pipe 6 and the valve 8 is withdrawn from the concrete vertical walls 13 with the ability to connect to the valve 8 pump 9 for pumping abnormally high groundwater level 14 (see Fig. 4) and lowering it to the level 2 groundwater. The control is carried out by opening the valve 8 (when disconnected the pump 9). At lower level 14 to level 2, the ground water must not overflow valve 8.

The method is as follows.

In the excavated trench in the first layer of water-saturated soil 2 inside the building 1 is placed horizontally along the entire length of underground structures 1 perforated pipe 4, through which the check valve 5 with a suction pipe 6 of the pump 9 includes a pump 9 and the lower level is 2 removed from underground structures 1, then dig a trench in the second layer of water-saturated soil 2, immersed in her perforated pipe 4 with a suction pipe 6 of the pump 9, dehydrating the second soil layer 2 and remove it from underground structures 1. The same operations are performed in the other soil layers 2.

For the construction of the bottom 12 underground structure 1 along its length lay perforated pipe 4, through which the check valve 5 is connected with a suction pipe 6 of the pump 9, then turn the pump 9 and produce the pumping of groundwater from a perforated pipe 4 to decrease their level 11 below the level of the construction level of the bottom 12 of the structure 1, up to the completion of the construction of the partition 13, and until full sealing pressure of groundwater 2. The end of the suction pipe 6 of the pump 9 have a higher groundwater level 2, then the pump 9 is disconnected from the suction pipe 6, a perforated pipe 4 are left in the environment groundwater 2 below the bottom 12 of the structure 1, and the suction pipe 6 of the pump 9 with the remnants of it concreted ground water in the body of underground structures 1, leaving nezablokirovanne only the upper output the crown 7 of the pipe 6 with the valve 8, with the possibility of connection of pump 9.

In the case of avgo and operated underground structures 1, the valve 8 of the upper output of the crown 7 of the suction pipe 6 of the pump 9 is again connected to the pump 9 and produce the pumping emergency high water 14 to stop signs extrusion underground structures 1. Control over the lower level alarm high groundwater 14 to its normal level 2 is produced by opening the valve 8 of the upper crown 7 of the suction pipe 6 when disconnected the pump 9, with ground water from the valve 8 should not spill out when it is opened, if the emergency high level 14 groundwater decreased to normal level 2.

Example 1. During the construction of underground structures with a diameter of 36 m with a depth of 10 m at the normal height of the groundwater of 5 m, with a total weight of underground parts of buildings around 8000 tons, the force of extrusion (without taking into account the friction of the walls of the buildings on the ground) is

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The aboveground part of the underground facility was not yet built when the result of heavy rainfall, groundwater levels have risen to emergency about 8.5 m Respectively the force of extrusion underground structures from the soil increased 8642 t, which showed signs of extrusion plants from the soil.

After pumping abnormally high groundwater Metal capacity weighing 330 tons, with a base area of 250 m2buried in the ground at 3.5 m with normal ground water level 1 m Power extrusion plants from the soil was 250 so as the result of heavy rainfall, the groundwater level rose to abnormally high, 1.8 m Power bump this increased to 450 tons and showed signs of extrusion plants from the soil.

After pumping abnormally high groundwater to a normal level signs extrusion disappeared.

1. A method of lowering of the groundwater during the construction and operation of underground structures located below the groundwater level, for example recessed wells with bottom and vertical walls, by pumping groundwater pump with suction and discharge pipes from the perforated pipes connected suction pipe of the pump, characterized in that the construction of the underground facilities of the lowering of the groundwater level is produced in layers inside underground structures by pumping a pump ground water from each layer separately with the subsequent removal dehydrated layers of soil from underground structures and for the construction of the bottom of the underground structure along its length lay perforated pipe, Kotorovych water from a perforated pipe before lowering them below the level of the construction level of the bottom of the construction up to the completion of the last building walls and to their full sealing pressure of groundwater, and the end of the suction pipe of the pump have above ground water level, the pump is then disconnected from the suction pipe, a perforated tube is left in the environment groundwater below the bottom of the structure, and the suction pipe of the pump with the remnants of it concreted ground water in the body of underground structures, leaving nezablokirovanne only the upper output the crown of the pipe with a valve, with the possibility of acceding to the pump.

2. The method according to p. 1, characterized in that the valve top output the crown of the suction pipe of the pump re-plug in the pump and produce a pumping emergency high water until no evidence of extrusion underground structures, and control over the lower level alarm high groundwater to normal levels produced by opening the valve of the upper crown of the suction pipe when disconnected the pump, while ground water from the valve should not leak when it is opened, if the emergency high groundwater level decreased to normal levels.

3. The device for implementing the method of the lowering of the groundwater containing the pump vsasavayasi, characterized in that after the construction of underground structures the upper end of the suction pipe of the pump is necessarily situated above the groundwater level of sealing, and the perforated pipe is located horizontally below the level of the bottom of the underground structure along its length in the environment, groundwater, and itself suction pipe with the remnants of it concreted ground water in the body vertical walls recessed well.

4. The device for implementing the method of the lowering of the groundwater under item 3, characterized in that the upper output the crown of the suction pipe with the slide removed outside the body of concrete underground structures with the ability to connect to the valve of the pump, for example, taken out of the body of concrete vertical walls recessed well.

 

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