Air exhaust and water drainage device for vacuum preloading foundation treatment

Abstract

The utility model discloses an air exhaust and water drainage device for vacuum preloading foundation treatment, which comprises a water-gas separator and a water level switch control device, and the water-gas separator is connected with a main pipeline; the water-gas separator comprises an upper barrel and a lower barrel; the upper barrel comprises an exhaust pipe, a drainage pipe and an upper shell, the exhaust pipe is arranged at the top of the upper shell, and a first check valve and a vacuum pump which are used for avoiding gas backflow in the vacuumizing process are sequentially arranged at the gas outlet end of the exhaust pipe; the drain pipe is fixedly mounted on one side of the upper shell, and a second check valve is arranged at the water outlet end of the drain pipe; the lower barrel comprises two water-gas inlet pipes, a submersible pump and a lower shell, the two water-gas inlet pipes are arranged on the two sides of the lower shell respectively, inlets of the water-gas inlet pipes are connected with the main pipeline respectively, and an outlet of each water-gas inlet pipe extends to the bottom of the lower shell; the submersible pump is arranged in the center of the bottom of the lower cylinder; the water inlet end of the drainage pipe extends to the bottom of the lower cylinder and is connected with the submersible pump; the water level switch control device is arranged on the inner surface of the lower shell.

Description

Technical Field

[0001] The utility model relates to the technical field of soft soil foundation treatment of civil engineering foundations and bases, and in particular to an air extraction and drainage device for vacuum preloading foundation treatment. Background Art

[0002] With the rapid economic development, industrial construction has expanded rapidly. In some economically developed areas or areas with scarce land resources, soft clay foundations need to be utilized as construction land. On the other hand, a large amount of silt is also generated in the dredging projects of coastal areas or the river and lake regulation projects in inland areas, which needs to be solidified and dehydrated. This kind of soil has the characteristics of high water content, poor permeability, high compressibility and low bearing capacity. Drainage consolidation method is often the preferred method for treating this kind of soft soil, which mainly includes vacuum preloading method, surcharge preloading method and vacuum combined surcharge preloading method. Among them, the main construction equipment of vacuum preloading process is vacuum pumping device. The traditional vacuum pumping device is jet pump, but due to its poor economy, many engineering projects have begun to adopt water-gas separation vacuum pumping device in recent years.

[0003] The existing technology (CN204753566U with the authorization announcement date of 2015.11.11) has a large diameter of the middle tank body, and it is difficult to excavate a relatively large pit in the soft soil foundation. The middle tank body needs to be fixed above the sealing membrane with the help of a support frame; and the water inlet of the middle tank body is located above the sealing membrane, which will cause pressure loss and high power consumption. Utility Model Content

[0004] The purpose of this application is to provide an air extraction and drainage device for vacuum preloading foundation treatment in order to address the technical defects existing in the prior art.

[0005] The technical solution adopted to achieve the purpose of this application is:

[0006] An air extraction and drainage device for vacuum preloading foundation treatment, comprising a water-gas separator and a water level switch control device, wherein the water-gas separator is connected to a main pipeline;

[0007] The water-gas separator comprises an upper cylinder and a lower cylinder, and the upper cylinder and the lower cylinder are connected via a flange;

[0008] The upper cylinder comprises an exhaust pipe, a drain pipe and an upper shell, wherein the exhaust pipe is arranged at the top of the upper shell, and a first check valve for preventing gas backflow during vacuuming and a vacuum pump for vacuuming are arranged at the gas outlet end of the exhaust pipe in sequence; the drain pipe is fixedly mounted on one side of the upper shell, and a second check valve for preventing backflow in the drain pipe is arranged at the water outlet end of the drain pipe;

[0009] The lower cylinder includes two water and gas inlet pipes, a submersible pump and a lower shell body. The two water and gas inlet pipes are respectively arranged on both sides of the lower shell body. The inlet of each water and gas inlet pipe is respectively connected to the main pipeline, and the outlet of each water and gas inlet pipe extends to the bottom of the lower shell body; the submersible pump is arranged at the bottom center of the lower cylinder body, and the water inlet end of the drain pipe extends to the bottom of the lower cylinder body and is connected to the submersible pump; the water level switch control device is arranged on the inner surface of the lower shell body.

[0010] In the above technical solution, both the upper cylinder and the lower cylinder are cylindrical structures, and the height of the lower cylinder is not less than 1.5m.

[0011] In the above technical solution, the water level switch control device includes a first water level switch controller and a second water level switch controller, and the position of the first water level switch controller is higher than the position of the second water level switch controller.

[0012] In the above technical solution, the outlet position of the air inlet pipe is lower than the position of the second water level switch controller.

[0013] In the above technical solution, a guide baffle is provided between the water vapor inlet pipe and the submersible pump to prevent the turbulence of water vapor at the water vapor inlet pipe from affecting the pumping efficiency of the submersible pump.

[0014] In the above technical solution, the height of the guide baffle is 30 cm.

[0015] In the above technical solution, the inlet of the water and gas inlet pipe is buried in the sand cushion layer under the sealing film and connected to the main pipeline.

[0016] The beneficial effects of the utility model are as follows:

[0017] 1. The lower cylinder of the water-gas separator of the utility model is buried in the foundation, and its top is flush with the surface of the sand cushion layer, so that the water-gas inlet pipe sinks, reducing the height difference between the water level in the lower shell of the water-gas separator and the reinforced area. The outlet of the water-gas inlet pipe is lower than the reinforced area and is always in the water, which can form a siphon effect, increase the vacuum pressure inside the water-gas separator, avoid pressure loss, and save a lot of electric energy; and the diameter of the lower cylinder is small and can be directly buried in the soft soil foundation.

[0018] 2. A guide baffle is provided between the water vapor inlet pipe and the submersible pump of the utility model, which can prevent the turbulence of water vapor at the water vapor inlet pipe from affecting the pumping efficiency of the submersible pump.

[0019] 3. The upper cylinder and the lower cylinder of the utility model are connected by a flange, and the sealing film is pressed between the upper cylinder and the lower cylinder, which can achieve a sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the present application or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] Figure 1 It is a schematic diagram of the structure of the air extraction and drainage device of the utility model.

[0022] Figure 2 It is a bottom view of the structure of the lower cylinder of the utility model.

[0023] Figure 3 It is a schematic diagram of the top view of the lower cylinder of the utility model.

[0024] Figure 4 It is a schematic diagram of the cross-sectional structure of the air extraction and drainage construction of the utility model.

[0025] Figure 5 It is a schematic diagram of the plane structure of the air extraction and drainage construction of the utility model.

[0026] In the figure: 1-reinforcement area surface, 2-sand cushion layer, 3-plastic drainage board, 4-horizontal drainage filter pipe, 5-sealing membrane, 6-water-gas separator, 6-1-water-gas inlet pipe, 6-2-exhaust pipe, 6-3-first check valve, 6-4-vacuum pump, 6-5-water level switch control device, 6-5-1-first water level switch controller, 6-5-2-second water level switch controller, 6-6-submersible pump, 6-7-drainage pipe, 6-7-1-second check valve, 6-8-guide baffle, 6-9-upper shell, 6-10-lower shell, 6-11-upper cylinder, 6-12-lower cylinder, 7-main pipeline, 8-vacuum tube, 9-film pressing groove. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the technical solution of the present utility model, the technical solution of the present utility model is further described below in conjunction with specific embodiments.

[0028] A vacuum drainage device for vacuum preloading foundation treatment, see Figure 1-3 , including a water-gas separator 6 and a water level switch control device 6-5, wherein the water-gas separator 6 is connected to the main pipeline 7, and is used to allow water in the reinforced foundation to enter the water-gas separator 6 and be pumped out through the water-gas separator 6.

[0029] The water-gas separator 6 comprises an upper cylinder 6-11 and a lower cylinder 6-12, wherein the upper cylinder 6-11 and the lower cylinder 6-12 are connected via a flange. Both the upper cylinder 6-11 and the lower cylinder 6-12 are cylindrical structures, and the height of the lower cylinder 6-12 is not less than 1.5 m.

[0030] The upper cylinder 6-11 includes an exhaust pipe 6-2, a drain pipe 6-7 and an upper shell 6-9. The exhaust pipe 6-2 is arranged at the top of the upper shell 6-9. The outlet end of the exhaust pipe 6-2 is sequentially provided with a first check valve 6-3 for preventing gas backflow during vacuuming and a vacuum pump 6-4 for vacuuming. The vacuum pump 6-4 is used to extract the gas in the upper shell 6-9 to form a negative pressure inside the water-gas separator 6; the drain pipe 6-7 is fixedly installed on one side of the upper shell 6-9, and the water outlet end of the drain pipe 6-7 is provided with a second check valve 6-7-1 to prevent the drain pipe 6-7 from backflowing.

[0031] The lower cylinder 6-12 includes two water and gas inlet pipes 6-1, a submersible pump 6-6 and a lower shell 6-10. The two water and gas inlet pipes 6-1 are respectively arranged on both sides of the lower shell 6-10. The inlet of each water and gas inlet pipe 6-1 is respectively connected to the main pipeline 7, and the outlet of each water and gas inlet pipe 6-1 extends to the bottom of the lower shell 6-10. When negative pressure is formed inside the water and gas separator 6, the negative pressure enters the main pipeline 7 through the water and gas inlet pipe 6-1 and diffuses into the foundation, so that the water vapor in the foundation passes through the main pipeline 7. The water vapor is separated in the lower shell 6-10 (separated into water and gas), the gas is collected in the upper cylinder 6-11 and pumped out by the vacuum pump, and the water is collected in the lower cylinder 6-12; the submersible pump 6-6 is arranged at the bottom center of the lower cylinder 6-12, the water inlet end of the drainage pipe 6-7 extends to the bottom of the lower cylinder 6-12 and is connected to the submersible pump 6-6, and the drainage pipe 6-7 cooperates with the submersible pump 6-6 to pump out the water in the lower cylinder 6-12. The inlet of the water and gas inlet pipe 6-1 is buried in the sand cushion layer under the sealing membrane and connected to the main pipeline.

[0032] The water level switch control device 6-5 is arranged on the inner surface of the lower shell 6-10, and is used to detect the water level height in the lower cylinder 6-12, and control the submersible pump 6-6 to automatically open and close according to the water level height, wherein the submersible pump 6-6 can also be manually turned on and off.

[0033] The water level switch control device 6-5 includes a first water level switch controller 6-5-1 and a second water level switch controller 6-5-2. The position of the first water level switch controller 6-5-1 is higher than that of the second water level switch controller 6-5-2. When the first water level switch controller 6-5-1 detects that the water level in the lower cylinder 6-12 is greater than a first predetermined height, the submersible pump 6-6 is controlled to automatically start, and the water in the lower cylinder 6-12 is pumped out through the drain pipe 6-7. When the second water level switch controller 6-5-2 detects that the water level in the lower cylinder 6-12 is lower than a second predetermined height, the submersible pump 6-6 is controlled to automatically shut down. The outlet position of the air inlet pipe 6-1 is lower than that of the second water level switch controller 6-5-2, so that the outlet of the air inlet pipe 6-1 is always in the water, forming a siphon effect.

[0034] A guide baffle 6-8 is provided between the water vapor inlet pipe 6-1 and the submersible pump 6-6 to prevent the turbulence of water vapor at the water vapor inlet pipe 6-1 from affecting the pumping efficiency of the submersible pump; the height of the guide baffle 6-8 is 30 cm.

[0035] A method for vacuum preloading foundation treatment to remove air and drain water, see Figure 4-5 , including the following steps:

[0036] Step 1, open a plurality of film-pressing trenches 9 on the soft soil foundation, then lay a sand cushion layer 2 (the thickness of the sand cushion layer 2 is not less than 40cm) on the surface 1 of the reinforcement area, use a plate inserter to install a plastic drainage board 3 in the soft soil foundation to form a vertical drainage channel, lay a horizontal drainage filter pipe 4 in the sand cushion layer 2 (the horizontal drainage filter pipe 4 is laid in the sand cushion layer 2 longitudinally and transversely, respectively, to ensure the rapid and uniform transmission of negative pressure vacuum) and a main pipeline 7, plug the plastic drainage board 3 with the horizontal drainage filter pipe 4, and connect the horizontal drainage filter pipe 4 with the main pipeline 7. Among them, the reinforcement area of ​​this embodiment is every 800-1200m 2 Lay out a main pipeline 7.

[0037] Step 2, evenly arrange multiple lower cylinders 6-12 in the reinforcement area so that the top of each lower cylinder 6-12 is at the same horizontal plane as the surface of the sand cushion layer 2, and connect the water and gas inlet pipe 6-1 of each air extraction and drainage device to the main pipeline 7.

[0038] Step 3, laying a sealing film 5 (preferably 2 to 3 layers of the sealing film 5) on the surface of the sand cushion layer 2, pressing the surrounding of the sealing film 5 into the film pressing groove 9 for sealing, and then connecting each upper cylinder 6-11 and the lower cylinder 6-12 through a flange, and pressing the sealing film 5 between the upper cylinder 6-11 and the lower cylinder 6-12 to achieve a sealing effect. Among them, the adjacent water-gas separators 6 are connected by vacuum tubes 8.

[0039] Step 4, evacuate the interior of the water-gas separator 6 by means of the vacuum pump 6-4, so that negative pressure is formed inside the water-gas separator 6, and the negative pressure enters the main pipe 7 through the water-gas inlet pipe 6-1 and diffuses into the soft soil foundation, so that the water vapor in the soft soil foundation enters the bottom of the lower shell 6-10 through the main pipe 7, and the water vapor is separated into water and gas in the lower shell 6-10, the gas is collected in the upper cylinder 6-11 and extracted by the vacuum pump, and the water is collected in the lower cylinder 6-12.

[0040] Step 5, use the water level switch control device 6-5 to detect the water level in the lower cylinder 6-12, and control the opening and closing of the submersible pump 6-6 according to the water level. When the submersible pump 6-6 is turned on, the water in the lower cylinder 6-12 is pumped out through the drain pipe 6-7.

[0041] Among them, when the vacuum pump 6-4 evacuates the inside of the water-gas separator 6, the first check valve 6-3 is used to prevent gas backflow during the vacuum process; when the water in the lower cylinder 6-12 is pumped out through the drain pipe 6-7, the second check valve 6-7-1 is used to prevent backflow of the drain pipe 6-7.

[0042] Furthermore, the diameter of the horizontal drainage filter pipe 4 is 3 to 6 cm, and small holes are punched on the pipe body of the horizontal drainage filter pipe 4, and a filter cloth is wrapped on the outside thereof, which can ensure good water permeability and has a certain ring stiffness and will not be damaged under negative pressure conditions.

[0043] For ease of explanation, spatial relative terms such as "upper", "lower", "left", "right" and the like are used in the embodiments to illustrate the relationship of one element or feature shown in the figure relative to another element or feature. It should be understood that, in addition to the orientation shown in the figure, the spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figure is inverted, the element described as being "under" other elements or features will be positioned "on" other elements or features. Therefore, the exemplary term "under" can include both upper and lower orientations. The device can be positioned in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used here can be interpreted accordingly.

[0044] Furthermore, relational terms such as “first” and “second” and the like are merely used to distinguish one component from another having the same name, but do not necessarily require or imply any such actual relationship or order between these components.

[0045] The above is only a preferred embodiment of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A vacuum drainage device for vacuum preloading foundation treatment, characterized in that: It includes a water-gas separator and a water level switch control device, wherein the water-gas separator is connected to the main pipeline; The water-gas separator comprises an upper cylinder and a lower cylinder, and the upper cylinder and the lower cylinder are connected via a flange; The upper cylinder comprises an exhaust pipe, a drain pipe and an upper shell, wherein the exhaust pipe is arranged at the top of the upper shell, and a first check valve for preventing gas backflow during vacuuming and a vacuum pump for vacuuming are arranged at the gas outlet end of the exhaust pipe in sequence; the drain pipe is fixedly mounted on one side of the upper shell, and a second check valve for preventing backflow in the drain pipe is arranged at the water outlet end of the drain pipe; The lower cylinder includes two water and gas inlet pipes, a submersible pump and a lower shell body. The two water and gas inlet pipes are respectively arranged on both sides of the lower shell body. The inlet of each water and gas inlet pipe is respectively connected to the main pipeline, and the outlet of each water and gas inlet pipe extends to the bottom of the lower shell body; the submersible pump is arranged at the bottom center of the lower cylinder body, and the water inlet end of the drain pipe extends to the bottom of the lower cylinder body and is connected to the submersible pump; the water level switch control device is arranged on the inner surface of the lower shell body.

2. The air extraction and drainage device according to claim 1, characterized in that: The upper cylinder and the lower cylinder are both cylindrical structures, and the height of the lower cylinder is not less than 1.5m.

3. The air extraction and drainage device according to claim 1, characterized in that: The water level switch control device comprises a first water level switch controller and a second water level switch controller, wherein the position of the first water level switch controller is higher than the position of the second water level switch controller.

4. The air extraction and drainage device according to claim 1 or 3, characterized in that: The outlet position of the air inlet pipe is lower than the position of the second water level switch controller.

5. The air extraction and drainage device according to claim 1, characterized in that: A guide baffle is arranged between the water vapor inlet pipe and the submersible pump to prevent the turbulence of water vapor at the water vapor inlet pipe from affecting the pumping efficiency of the submersible pump.

6. The air extraction and drainage device according to claim 5, characterized in that: The height of the guide baffle is 30 cm.

7. The air extraction and drainage device according to claim 1, characterized in that: The inlet of the water and gas inlet pipe is buried in the sand cushion layer under the sealing film and connected to the main pipeline.

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