CN218933175U

CN218933175U - Soft soil foundation treatment device for coal field of coal-fired power plant

Info

Publication number: CN218933175U
Application number: CN202222924485.6U
Authority: CN
Inventors: 尹洁; 张所庆; 董继峰; 李付栋; 林辉
Original assignee: Norinco International Cooperation Ltd
Current assignee: Norinco International Cooperation Ltd
Priority date: 2022-11-03
Filing date: 2022-11-03
Publication date: 2023-04-28
Anticipated expiration: 2032-11-03

Abstract

The utility model relates to a soft soil foundation treatment device for a coal field of a coal-fired power plant, which comprises a drainage main pipeline, a water collecting tank, a water pumping main pipeline, a water pumping motor, an air pumping main pipeline, an air pumping motor, a drainage unit and a water absorbing unit; the drainage unit comprises a drainage well pipe, a drainage branch pipeline and a deep sand well pump, wherein the drainage branch pipeline is arranged in the drainage well pipe; the water suction unit comprises a water pumping well pipe, a water pumping branch pipeline and a water filtering pipe, wherein the water pumping branch pipeline and the water pumping branch pipeline are arranged in the water pumping well pipe; the drainage well pipe and the water pumping well pipe are respectively arranged in the corresponding pipe well; the utility model can avoid the loss of silt particles of the bearing layer at the deep pile end caused by long-time deep well pumping, the well pipe is sealed by the blind pipe, and the sand content of the water outlet of the dewatering well is monitored in the pumping process, so that the sand content of the water outlet is ensured not to be larger than a set value; reducing post-construction settlement, improving the filling strength, reducing the non-uniformity of filling, and reducing or avoiding the occurrence of related problems. The quality of the foundation of the coal yard area is improved, and risks are prevented.

Description

Soft soil foundation treatment device for coal field of coal-fired power plant

Technical Field

The utility model belongs to the technical field of soft soil foundation treatment, and particularly relates to a soft soil foundation treatment device for a coal field of a coal-fired power plant.

Background

For the construction of a super supercritical thermal power station of a soft soil foundation in a coal yard area, due to factors such as engineering geological conditions, site conditions, pretreatment purposes, requirements of different buildings and the like, a common preloading and drainage scheme is adopted, a vertical sand well is arranged in the soft soil foundation to serve as a drainage channel, a pile end bearing layer is designed in a deep layer, if water is pumped in the layer, the pumping quantity of a single well is large due to the fact that water is abundant, part of silt particles are necessarily pumped out after long-time pumping, and disturbance is caused to the pile end bearing layer. If the problem is ignored, the original compact state of the pile end bearing layer is very easy to change, and the pile end bearing layer cannot be lost.

Disclosure of Invention

The utility model provides a soft soil foundation treatment device for a coal field of a coal-fired power plant, which aims to solve the technical problems that: the problem of deep pile end bearing layer silt particle loss caused by long-time deep well pumping is solved.

In order to solve the technical problems, the utility model provides a soft soil foundation treatment device for a coal field of a coal-fired power plant, which is characterized in that: the water pump comprises a water draining main pipeline 2, a water collecting tank 3, a water pumping main pipeline 4, a water pumping motor 6, an air pumping main pipeline 7, an air pumping motor 15, a water draining unit 9 and a water absorbing unit 12; the drainage unit comprises a drainage well pipe, a drainage branch pipeline 14 and a deep sand well pump 10, wherein the drainage branch pipeline is arranged in the drainage well pipe; the water suction unit 12 comprises a water pumping well pipe, a water pumping branch pipe 8, a water pumping branch pipe 13 and a filtering water pipe 11 which are arranged in the water pumping well pipe; the drainage well pipe and the water pumping well pipe are respectively arranged in the corresponding pipe well; the drainage main pipeline 2 is communicated with the drainage branch pipeline 14, the drainage branch pipeline 14 is communicated to the bottom of a drainage well pipe, and the deep sand well pump is connected with the drainage branch pipeline at the bottom of the drainage well pipe; the water pumping main pipeline 4 is communicated with a water pumping branch pipeline 8, a water pumping motor 6 and a filtering water pipe 11, and the water pumping branch pipeline is connected with the filtering water pipe 11 at the bottom of a water pumping well pipe; the air extraction main pipeline 7 is communicated with an air extraction branch pipeline 13 and an air extraction motor 15.

The beneficial effects are that: the utility model can avoid the loss of silt particles of the bearing layer at the deep pile end caused by long-time deep well pumping, the well pipe is sealed by a blind pipe in a certain range above and below the bearing layer, and in the pumping process, the sand content of the water outlet of the dewatering well is monitored, so that the sand content of the water outlet is ensured not to be larger than a set value; reducing post-construction settlement, improving the filling strength, reducing the non-uniformity of filling, and reducing or avoiding the occurrence of related problems. The quality of the foundation of the coal yard area is improved, and risks are prevented.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is an enlarged schematic view of a pipe well section K;

FIG. 3 is a schematic diagram of a tubing well arrangement.

Wherein: 1 coal field pile loading dredger fill, 2 drainage main pipelines, 14 drainage branch pipelines, 9 drainage units, 10 deep sand well pumps, 3 water collection tanks, 4 water pumping main pipelines, 8 water pumping branch pipelines, 6 water pumping motors, 11 filtering water pipes, 7 air pumping main pipelines, 13 air pumping branch pipelines, 12 water absorption units, 15 air pumping motors, 1 coal field pile loading dredger fill, 5 construction operation surfaces and E coal field; a K well pipe improvement part, a blind pipe of a 21 well pipe; e, soft soil foundation and J well pipe in coal yard area.

Detailed Description

To make the objects, contents and advantages of the present utility model more apparent, the following detailed description of the specific embodiments of the present utility model will be given.

The utility model provides a soft soil foundation treatment device for a coal field of a coal-fired power plant, which is arranged below pile-loaded hydraulic reclamation soil in the coal field and comprises a drainage main pipeline 2, a water collecting tank 3, a water pumping main pipeline 4, a water pumping motor 6, a water pumping main pipeline 7, a water pumping motor 15, a drainage unit 9 and a water absorbing unit 12; a plurality of tube wells are arranged on the soft soil foundation; a corresponding drainage unit 9 or a corresponding water absorption unit 12 is arranged in the pipe well;

the drainage unit comprises a drainage well pipe, a drainage branch pipeline 14 and a deep sand well pump 10, wherein the drainage branch pipeline is arranged in the drainage well pipe; the water suction unit 12 comprises a water pumping well pipe, a water pumping branch pipe 8, a water pumping branch pipe 13 and a filtering water pipe 11 which are arranged in the water pumping well pipe; the drainage well pipe and the water pumping well pipe are respectively arranged in the corresponding pipe well;

the transverse drainage main pipeline 2 is communicated with the drainage branch pipelines 14 of the drainage unit 9 and the deep sand well pump 10 to form a drainage device, the drainage branch pipelines 14 are communicated to the bottom of a drainage well pipe, the drainage branch pipelines are connected in parallel, the deep sand well pump is connected with the drainage branch pipelines at the bottom of the drainage well pipe, and the water outlet pipeline of the drainage main pipeline is connected with the water collecting tank.

The water pumping main pipeline 4 is communicated with the water pumping branch pipeline 8, the water pumping motor 6 and the filtering water pipe 11 to form a water pumping and absorbing device, the water pumping branch pipelines are connected in parallel, and the water pumping branch pipeline is connected with the filtering water pipe 11 at the bottom of the water pumping well pipe; the water outlet pipeline of the water pumping main pipeline is connected with the water collecting tank. The air extraction main pipeline 7 is communicated with the air extraction branch pipelines 13 and the air extraction motor 15, and all the air extraction branch pipelines 13 are connected in parallel.

The bottom of the drainage branch pipe 14 in the drainage unit 9 is positioned at the well pipe, a section of blind pipe 21 is arranged in a certain range above and below the K section, the loss of powder sand particles of a bearing layer at the deep pile end caused by long-time deep well pumping is avoided, the well pipe is sealed by the blind pipe 21 in the certain range above and below the K section, in the pumping process, the sand content of water discharged by the drainage unit 9 is monitored, the sand content of water discharged is ensured to be not more than a set value, the quality of a foundation of a coal yard area is improved, and risks are prevented.

The water pumping well pipe adopts a filtering water pipe 11 from top to bottom, and the filtering water pipe 11 is selected to combine local experience and a UPVC strip gap filtering water pipe which is a local common well pipe material. The construction of the drainage unit 9 and the water absorption unit 12 adopts a positive/negative circulation clear water drilling process, and the slurry consistency is controlled during drilling, so that the verticality of a drilling pipe is ensured, and the bottom of the pipe is closed. The filter material adopts sand and stone materials which are well rounded, hard in texture and free of soil and impurities, and the well is filled with the filter material uniformly and continuously along the periphery of the well pipe. After the filter material is filled, the pumping unit and the drainage unit must be washed in time, and the well washing method adopts the pumping motor 15 to pump and wash the well.

The well pipes J of a plurality of drainage units are vertically arranged in a soft soil foundation E of a coal yard area needing compaction and consolidation, and are connected with a transverse drainage main pipeline 2, a water pumping main pipeline 4 and an air pumping main pipeline 7, and a deep sand well pump 10 in the drainage unit 9, an air pumping motor 15 and a water pumping motor 6 outside the water absorbing unit 12 provide power and energy for a rapid water absorbing and draining treatment device of the soft soil foundation.

The water draining unit and the water absorbing unit are provided with a piling dredger fill with a pressurizing function; the water draining unit and the water absorbing unit are square, 68-70m deep and 70m wide, and 40 well pipes are arranged.

The pipe well soil is divided into the same soil layer according to the soil with similar engineering properties, and is divided into (1) filling soil, (2) silt, (3) silt, (4) silt clay, (5) sand silt inter-layers, (6) silt clay silt inter-layers, (7) silt clay inter-layers and (8) silt fine sand;

the process flow is as follows: the method comprises the steps of measuring and positioning the positions of drain pipe wells J of a drainage unit, digging the drain unit 9, absorbing water in the holes of the drainage unit 12, an Hutong, drilling a drill to be in position, backfilling sand cushion layers at the bottoms of the drain pipe wells J of the drainage unit, hanging a pipe line of the drain pipe well J of the drainage unit, backfilling a gravel filtering layer between the pipe line and a hole wall, washing the pipe line well J of the drain pipe unit, arranging a water pump in the pipe line of the drain pipe well J of the drainage unit, installing a water pumping control circuit, testing the water in the drain pipe well J of the drainage unit, normally working the drain pipe well J of the drainage unit, pulling the pipe line J of the drainage unit after dewatering, and sealing the well.

The post-construction settlement of weak soil below the pile end is reduced, especially the interlayer between the silty clay and silty sand of the layer (6) with poor soil quality is reduced, and the burial depth is 45-65m. The treatment depth of the vertical shafts such as common sand wells, bagged sand wells, water drainage belts and the like is limited, and the vertical shafts are difficult to reach below the pile end. Therefore, the pipe well is used as a vertical drainage channel, and the pore water pressure of the deep soil layer is reduced by pumping water, so that the design depth of the pipe well reaches 68-70m.

The design interval of the pipe wells is 70m, 40 drain pipe wells are arranged in the stacking range of the coal yard zone, and the overlarge well interval cannot obviously reduce the underground water level between the two wells by combining the on-site pumping test result, so that the dead weight stress of soil is increased. Meanwhile, the permeability coefficient of the interlayer between the powdery clay and the powdery sand of the layer (6) is small, and the horizontal seepage path is longer under the condition of designing the well spacing, and mainly drainage to the sand layer is mainly performed vertically.

The silty clay layers and the silt or silt layers in the field are distributed in a shape of a kilobed cake, and most clay layers have bidirectional drainage conditions. The layer (4) of silty clay and the layer (6) of silty clay and silty sand are all saturated soft plastic clay, and are respectively positioned above and below the layer (5) of silty sand of the pile end bearing layer, and have large thickness and deeper burial depth, but the silty sand thin interlayers are arranged in the layers. The deep well is arranged to pump water, so that the horizontal drainage path of the sand layer in the foundation soil can be shortened, the pore water pressure of the lens sand layer is reduced, and the drainage speed of the viscous soil layer to the sand layer is accelerated.

The well pipe is sealed by blind pipes in the layer and a certain range up and down, and in the pumping process, the sand content of the water outlet of the dewatering well is monitored, so that the sand content of the water outlet is ensured to be not more than 1/20000 (volume ratio).

The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present utility model, and such modifications and variations should also be regarded as being within the scope of the utility model.

Claims

1. A soft soil foundation treatment device for coal field areas of coal-fired power plants is characterized in that: the device comprises a drainage main pipeline, a water collecting tank, a water pumping main pipeline, a water pumping motor, an air pumping main pipeline, an air pumping motor, a drainage unit and a water absorbing unit; the drainage unit comprises a drainage well pipe, a drainage branch pipeline and a deep sand well pump, wherein the drainage branch pipeline is arranged in the drainage well pipe; the water suction unit comprises a water pumping well pipe, a water pumping branch pipeline and a water filtering pipe, wherein the water pumping branch pipeline and the water pumping branch pipeline are arranged in the water pumping well pipe; the drainage well pipe and the water pumping well pipe are respectively arranged in the corresponding pipe well; the drainage main pipeline is communicated with the drainage branch pipeline, the drainage branch pipeline is communicated to the bottom of the drainage well pipe, and the deep sand well pump is connected with the drainage branch pipeline at the bottom of the drainage well pipe; the water pumping main pipeline is communicated with the water pumping branch pipeline, the water pumping motor and the filtering water pipe, and the water pumping branch pipeline is connected with the filtering water pipe at the bottom of the water pumping well pipe; the air extraction main pipeline is communicated with the air extraction branch pipeline and the air extraction motor.

2. The soft soil foundation treatment device for coal-fired power plant coal field area according to claim 1, wherein: a plurality of tube wells are arranged on the soft soil foundation.

3. The soft soil foundation treatment device for coal-fired power plant coal field area according to claim 1, wherein: and the drainage branch pipes are connected in parallel.

4. The soft soil foundation treatment device for coal-fired power plant coal field area according to claim 1, wherein: the water outlet pipeline of the drainage main pipeline is connected with the water collecting tank.

5. The soft soil foundation treatment device for coal-fired power plant coal field area according to claim 1, wherein: and all the water pumping branch pipelines are connected in parallel.

6. The soft soil foundation treatment device for coal-fired power plant coal field area according to claim 1, wherein: the air extraction branch pipes are connected in parallel.

7. The soft soil foundation treatment device for coal-fired power plant coal field area according to claim 1, wherein: the water outlet pipeline of the water pumping main pipeline is connected with the water collecting tank.

8. The soft soil foundation treatment device for coal-fired power plant coal field area according to claim 1, wherein: the bottom of the drainage branch pipeline is provided with a blind pipe.