A soft soil foundation drainage siphon group pipe air exhaust decompression starting device and method

Abstract

The application discloses a soft soil foundation drainage siphon group pipe air extraction decompression starting device and method, and aims to solve the low starting efficiency of multiple siphon pipes in the prior art. The application solves the above technical problems through the following technical scheme: the water outlet of the siphon group pipe is arranged in a water collecting well, the water inlet of the siphon group pipe is arranged in the soft soil foundation, and the water outlet of the siphon group pipe is located below the water inlet horizontal plane; a drainage device is arranged at the bottom of the water collecting well and is used for draining water in the water collecting well; and a vacuum air extraction assembly is used for draining air in the siphon group pipe. In the application, the soft soil foundation drainage siphon group pipe air extraction decompression starting device is adopted, the water pump is matched with the vacuum air extraction assembly, the siphon effect of all the siphon pipes can be started at one time, and the labor cost can be greatly reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of geotechnical engineering, more particularly, it relates to a soft soil foundation drainage siphon group pipe air extraction pressure reduction starting device and method. BACKGROUND

[0002] There are a large number of soft soils in the southeast coastal areas and the lower reaches of rivers in China, and a large number of populations are concentrated in these areas. In order to adapt to the continuous development of economic construction, a large number of buildings are built on soft soil foundations. Soft soil has the characteristics of high natural water content, large void ratio, strong compressibility, low permeability, poor bearing capacity and the like. When buildings are built on soft soil foundations, engineering loads are easy to cause excessive settlement of the foundation, and due to the low permeability of soft soil, the duration of the consolidation settlement of the foundation is very long. Especially under the engineering condition of large thickness of soft soil layer in the deep soft soil foundation, the drainage path of the underground water flowing out of the surface in the deep soft soil foundation is long, and the natural drainage consolidation time may last for tens to hundreds of years. The excessive post-construction settlement often affects the normal use of the project, and even causes engineering disasters.

[0003] The drainage consolidation methods previously used mainly include loading preloading method, vacuum preloading method and the like, which have good drainage consolidation effects on shallow soft soil, but have poor drainage consolidation effects on deep soft soil. The realization of the deep soft soil drainage consolidation treatment requires a long time, high engineering cost and many process control requirements. In order to improve the drainage consolidation speed and effect of the soft soil foundation, a group pipe siphon drainage method for controlling the drainage of the water well is proposed in recent years. The underground water level in the water well is lowered by using the drainage pump with a water level control system, the underground water in the foundation soil enters the siphon pipe, and then the water in the water well is pumped to the surface by the drainage pump, so as to realize the lowering of the underground water level in the foundation soil. However, the initial state of the siphon pipe is an air-filled pipe, the basic condition for siphon starting is that the pipe is filled with water, and the siphon starting needs to be performed to realize the siphon drainage into the working state. In addition, due to the influence of various factors, after the siphon is started during the construction period, some siphon pipes may be disconnected, and the siphon starting needs to be repeatedly performed. At present, the siphon starting is performed in an artificial way, and each siphon pipe is started into the working state. Since the number of siphon pipes is large, and the diameter of the water well is small, the siphon starting process is slow, and the working efficiency is low. SUMMARY

[0004] The soft soil foundation drainage siphon group pipe air extraction pressure reduction starting device provided by the present application can efficiently start multiple siphon pipes at the same time, improve the starting efficiency of the soft soil foundation drainage siphon group pipe, save the labor cost of siphon starting, and realize one-time rapid starting of the siphon group pipe.

[0005] In order to solve the above technical problems, the present application adopts the following technical scheme: a soft soil foundation drainage siphon group pipe air extraction pressure reduction starting device, comprising:

[0006] The siphon group pipe comprises a plurality of siphon pipes, the water outlet of the siphon group pipe is arranged in the water collecting well, the water inlet of the siphon group pipe is arranged in the soft soil foundation, and the water outlet of the siphon group pipe is located below the water inlet horizontal plane;

[0007] The drainage device is arranged at the bottom of the water collecting well and is used for draining water in the water collecting well.

[0008] The vacuum air extraction assembly is used for extracting air in the siphon group pipe.

[0009] The soft soil foundation drainage siphon group pipe air extraction and pressure reduction starting device can realize one-time starting of all siphon pipes, can greatly reduce the labor cost, and can conveniently realize repeated starting of siphoning.

[0010] As preferred, the vacuum air extraction assembly comprises:

[0011] The sealing cover is used for sealing the well mouth of the water collecting well, so that the water collecting well forms a sealed cavity.

[0012] The air extraction pipe is arranged in the sealed cavity formed by the water collecting well and the sealing cover, and one end of the air extraction pipe is connected with the vacuum pump.

[0013] The sealing cover and the water collecting well cooperate to form a sealed cavity, so that the air extraction pump can extract air in the water collecting well.

[0014] As preferred, the sealing cover is a sealing film, and the sealing film has a central diameter of the water collecting well greater than 6 m.

[0015] As preferred, the diameter of the water collecting well is 0.8 m to 1.2 m, and the depth of the water collecting well is 18 m to 20 m.

[0016] The vertical height of the water outlet from the well mouth of the water collecting well is greater than 15 m.

[0017] The drainage device is arranged at a position 0.4 m to 0.6 m from the well bottom of the water collecting well.

[0018] As preferred, the vacuum air exhaust assembly comprises: a vacuum box and an air exhaust pipe, the vacuum box is slidingly arranged on the sidewall of the water collecting well, the vacuum box is connected with a pulling cable for pulling the vacuum box to slide along the sidewall; one end of the air exhaust pipe is communicated with the vacuum box, and the other end of the air exhaust pipe is connected with a vacuum pump; the top plate of the vacuum box is provided with a plurality of upper perforations, the bottom plate of the vacuum box is provided with a plurality of lower perforations, the siphon pipe 11 is a hard pipe, and the siphon pipe is arranged through the vacuum box through the upper perforations and the lower perforations; the outer sidewall of the siphon pipe is fixedly provided with an upper sealing table and a lower sealing table corresponding to the upper perforations and the lower perforations respectively, and a plurality of water flow grooves are arranged on the sidewall of the siphon pipe between the lower sealing table and the upper sealing table.

[0019] By arranging the vacuum box, the vacuum box, the upper sealing table and the lower sealing table form a sealed cavity, and because the volume of the vacuum box is much smaller than the volume of the whole water collecting well, a vacuum can be quickly formed in the vacuum box, so that the siphon pipe is quickly filled with water, and the starting speed of the group siphon pipe is further improved.

[0020] As preferred, the upper sealing table and the lower sealing table are arranged in the shape of an inverted circular table, and the upper perforations and the lower perforations are arranged in the shape of a tapered surface matched with the inverted circular table.

[0021] The upper perforations and the lower perforations are arranged in the shape of a tapered surface matched with the inverted circular table, so that the sealing box 5 can better form a sealed cavity.

[0022] As preferred, a sliding rail is vertically arranged on the sidewall of the water collecting well, and a pulley is arranged on the vacuum box and matched with the sliding rail, and the pulley and the sliding rail are slidingly matched.

[0023] The pulley and the sliding rail are slidingly matched, so that the vacuum box can be more easily slid along the sliding rail.

[0024] As preferred, a guide rod is arranged below the lower sealing table of the siphon pipe, and the diameter of the guide rod is smaller than the diameter of the siphon pipe.

[0025] The diameter of the guide rod is smaller than the hole diameter of the lower perforation, and the water in the vacuum box flows out from the gap between the lower perforation and the guide rod, so that the water in the vacuum box can be conveniently discharged.

[0026] The application also provides a soft soil foundation drainage siphon group pipe air exhaust decompression starting method, which comprises the following steps:

[0027] Step 1: drilling a water collecting well, placing a water pump connected with a water level controller at the bottom of the water collecting well, leading a drainage pipe connected with the water pump out of the surface drainage ditch, arranging and binding the water outlets of all siphon pipes together and then putting them into the water collecting well, keeping the position of the water outlets of the siphon pipes below the surface at a depth greater than 12 m, covering a sealing film on the surface centering on the water collecting well, and putting one end of an air exhaust pipe into the water collecting well and connecting the other end with a vacuum pump.

[0028] Step 2: air is extracted from the air extraction pipe, the pressure of the negative pressure in the well is kept at 3-5m water head height, the underground water in the soft soil foundation is caused to flow into the water collecting well through the siphon pipe, and the air extraction is stopped after all the siphon pipes are filled with water;

[0029] Step 3: the connection between the air extraction pipe and the vacuum pump is released, the water collecting well is kept in communication with the outside air through the air extraction pipe, the water pump is started to extract water, the water level of the water collecting well is lowered to 15m below the ground surface, the siphon group pipe starts to work normally, the water in the soft soil foundation is caused to flow into the water collecting well through siphon action, and is discharged to the ground surface drainage ditch through the drainage pipe connected to the water pump.

[0030] Compared with the prior art, the beneficial effects of the present application are:

[0031] (1) the soft soil foundation drainage siphon group pipe air extraction decompression starting device in the present application can realize one-time starting of all siphon pipes, and can greatly reduce the labor cost;

[0032] (2) since the diameter of the water collecting well is small, and hundreds to thousands of siphon pipes need to be put into the water collecting well, it is easy to cause knotting phenomenon during the process of starting each siphon pipe into the working state, and it is more difficult to repeatedly start siphon, and the soft soil foundation drainage siphon group pipe air extraction decompression starting device in the present application can conveniently realize repeated starting of siphon;

[0033] (3) the vacuum box is arranged, the volume of the vacuum box is much smaller than the volume of the whole water collecting well, so that the vacuum can be quickly formed in the vacuum box, the siphon pipe is quickly filled with water, and the starting speed of the group siphon pipe is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 is a structural schematic diagram of embodiment 1 of the present application;

[0035] Figure 2 is a structural schematic diagram of embodiment 2 of the present application;

[0036] Figure 3 is a structural schematic diagram of the vacuum box of embodiment 2 of the present application;

[0037] Figure 4 is a structural schematic diagram of the vacuum box of embodiment 2 of the present application in another state;

[0038] In the figure: 1, siphon group pipe, 11, siphon pipe, 111, upper sealing strip, 112, lower sealing table, 113, water flow groove, 114, guide rod, 12, water outlet, 13, water inlet;

[0039] 2, drainage device, 21, water pump, 22, water extraction pipe;

[0040] 3, water collecting well, 31, side wall;

[0041] 41, sealing cover, 42, air extraction pipe, 43, vacuum pump;

[0042] 5, vacuum box, 51, cable, 52, top plate, 521, upper perforation, 53, bottom plate, 531, lower perforation, 54, slide rail. DETAILED DESCRIPTION

[0043] The technical solutions of the present application will be further described in detail below with specific examples and in conjunction with the drawings:

[0044] Example 1: Referring to Figure 1 As shown in the figure, a soft soil foundation drainage siphon group pipe air extraction decompression starting device, comprising:

[0045] Siphon group pipe 1, the siphon group pipe 1 includes a plurality of siphon pipes 11, the water outlet 12 of the siphon group pipe 1 is arranged in the water collecting well 3, the water inlet 12 of the siphon group pipe 1 is arranged in the soft soil foundation, the water outlet 12 of the siphon group pipe 1 is below the water inlet 13 horizontal plane; The vertical height difference between the water outlet 12 and the water inlet 13 is greater than 3m;

[0046] Drainage device 2, the drainage device 2 includes a water pump 21 arranged at the bottom of the water collecting well 3 and a water extraction pipe 22 connected with the water pump 21, the wellhead edge of the water collecting well 3 is provided with a drainage ditch, and the drainage device is used for draining water in the water collecting well 3 to the drainage ditch;

[0047] Vacuum air extraction assembly, for discharging air in the siphon group pipe 1;

[0048] The vacuum air extraction assembly includes a sealing cover 41 and an air extraction pipe 42;

[0049] The sealing cover 41 is used for sealing the wellhead of the water collecting well 3, so that the water collecting well 3 forms a closed cavity, and the sealing cover adopts a sealing film; The sealing film has a diameter greater than 6m with the water collecting well 3 as the center;

[0050] One end of the air extraction pipe 42 is arranged in the closed cavity formed by the water collecting well 3 and the sealing cover 41, and the other end of the air extraction pipe 42 is connected with the vacuum pump 43.

[0051] The diameter of the water collecting well 3 is 0.8m to 1.2m, and the depth of the water collecting well 3 is 18m to 20m; The vertical height of the water outlet 12 from the wellhead of the water collecting well 3 is greater than 15m; The drainage device 2 is arranged at a distance of 0.4m to 0.6m from the well bottom of the water collecting well, and the water pump has a lifting dust greater than 30m.

[0052] In this embodiment, the specific data of the relevant parameters are as follows: the water collecting well 3 is a deep well with a diameter of 1 m and a depth of 20 m formed by drilling; the water outlet 12 of the siphon group pipe 1 is located at a vertical height of 15 m from the inlet of the water collecting well 3, and the sealing membrane has a diameter greater than 6 m with the water collecting well 3 as the center.

[0053] The working principle of this embodiment is as follows, mainly including two stages:

[0054] 1) The air suction stage: air is sucked out from the water collecting well 3 through the air suction pipe 42, the negative pressure in the water collecting well 3 is maintained at 5 m of water head height, the water surface pressure in the water collecting well 3 is reduced, the underground water in the soft soil foundation is driven to flow into the water collecting well 3 through the siphon pipe 11, when all the siphon pipes 11 are filled with water, the air suction is stopped, and the connection between the air suction pipe 42 and the vacuum pump 43 is disconnected, the air suction pipe 42 is used to maintain the communication between the water collecting well 3 and the outside air, so that the air pressure in the water collecting well 3 is in a normal pressure state.

[0055] 2) The water pumping stage: the water pumping pump 21 is started, the water level in the water collecting well is lowered to 15 m below the well mouth, and the water level difference between the water collecting well 3 and the soft soil foundation is used to drive the siphon group pipe 1 to work.

[0056] The present application has the following advantages:

[0057] (1) The soft soil foundation drainage siphon group pipe air suction and pressure reduction starting device in the present application can start the siphon effect of all the siphon pipes 111 at one time, and can greatly reduce the labor cost.

[0058] (2) Since the diameter of the water collecting well 3 is small, and generally hundreds to thousands of siphon pipes 111 need to be put into the water collecting well 3, it is easy to produce knot phenomenon during the process of starting each siphon pipe 111 into working state, and it is also difficult to repeatedly start the siphon, and the soft soil foundation drainage siphon group pipe air suction and pressure reduction starting device in the present application can conveniently realize the repeated start of the siphon.

[0059] Embodiment 2: Referring to Figures 2 to 4 The present embodiment is similar to embodiment 1 in structure, and the difference lies in that the specific structure of the vacuum air suction assembly is different; in the implementation of embodiment 1, since the space in the water collecting well 3 is large, the air suction time is increased when the sealing cavity composed of the water collecting well 3 and the sealing cover 41 is suctioned, and the starting speed of the siphon group pipe 1 is slow, therefore, the structure of the vacuum air suction assembly is changed, so that the air discharge speed in the siphon group pipe 1 is increased, thereby further improving the starting speed of the siphon group pipe 1.

[0060] Specifically, the vacuum air suction assembly is used to discharge the air in the siphon group pipe 1, and the vacuum air suction assembly includes a vacuum box 5, an air suction pipe 42 and an air suction pump 43 communicated with the air suction pipe 42.

[0061] The vacuum box 5 and the suction pipe 42 are slidably mounted on the side wall 31 of the water collection well 3. The vacuum box 5 is connected to a cable 51 that pulls it along the side wall 31. There are two cables 51, and the upper end of the cable 51 is located on the ground surface. One end of the suction pipe 42 is connected to the vacuum box 5, and the other end of the suction pipe 42 is connected to the vacuum pump 43. The top plate 52 of the vacuum box 5 is provided with an upper through hole 521, and the bottom plate 53 of the vacuum box 5 is provided with a lower through hole 531. The siphon pipe 11 passes through the upper through hole 521 and the lower through hole 521 and is installed through the vacuum box 5. The outer side wall of the siphon pipe 11 is fixedly provided with an upper sealing platform 111 and a lower sealing platform 112 corresponding to the upper through hole 521 and the lower through hole 531, respectively. Several water channels 113 are provided on the side wall of the siphon pipe 11 between the lower sealing platform 112 and the upper sealing platform 111.

[0062] Both the upper sealing platform 111 and the lower sealing platform 112 are configured as inverted frustum shapes, and the upper through hole 521 and the lower through hole 531 are configured as conical surfaces that mate with the inverted frustum shape.

[0063] A slide rail 54 is vertically installed on the side wall 31 of the water collection well 3. There are two slide rails 54. A pulley that cooperates with the slide rail 54 is installed on the vacuum box 5. The pulley and the slide rail slide together.

[0064] A guide rod 114 is provided below the lower sealing platform 112 of the siphon tube 11, and the diameter of the guide rod 114 is smaller than the diameter of the siphon tube 11.

[0065] The working principle of this embodiment is as follows, including two stages:

[0066] 1) Vacuuming stage: such as Figure 2 As shown, the cable 51 is pulled at the upper end of the water collection well 3, causing the vacuum box 5 to move upward along the slide rail 54. After the vacuum box 51 moves upward a certain distance, the upper through hole 521 of the vacuum box 51 is sealed with the upper sealing platform 111, and the lower through hole 531 is sealed with the lower sealing platform 112, making the vacuum box 5 a sealed cavity. At this time, the water trough 113 is completely located inside the vacuum box 5. Then, the vacuum pump 43 is started to extract the air from the vacuum box 5, so that the groundwater in the soft soil foundation flows into the vacuum box 5 through the siphon pipe 11. When all the siphon pipes 11 are full of water, the air extraction is stopped.

[0067] 2) Pumping stage: such as Figure 3As shown, when all the siphon pipes 11 are filled with water, the air extraction is stopped, the pull rope 51 is released, the vacuum box 5 is moved downward along the slide rail 54 under the gravity, so that the bottom plate 53 of the vacuum box 5 is moved along the lower guide rod 114, and then the top plate 52 is abutted on the lower sealing table 112, at this time, the water flow groove 113 is all located outside the vacuum box 5, and at the same time, since the lower perforation 531 is located at the position of the guide rod 114, the diameter of the guide rod 114 is smaller than the hole diameter of the lower perforation 531, the water in the vacuum box 5 flows out from the gap between the lower perforation 531 and the guide rod 114, so that the water in the vacuum box 5 is all discharged; the water pump 21 is started, the water extraction reduces the water level of the water collecting well to below 15 m from the well mouth, and the water level difference between the water collecting well 3 and the soft soil foundation is utilized to drive the siphon group pipe 1 to work.

[0068] In the embodiment, the vacuum box 5 is arranged to form a sealed cavity with the upper sealing table 111 and the lower sealing table 112, and since the volume of the vacuum box 5 is much smaller than the volume of the whole water collecting well 3, the vacuum can be quickly formed in the vacuum box 5, so that the siphon pipes 11 are quickly filled with water, and the starting speed of the siphon group pipe 1 is further improved.

[0069] Embodiment 3: The application also provides a soft soil foundation drainage siphon group pipe air extraction decompression starting method, characterized in that the method comprises the following steps:

[0070] Step 1: a water collecting well 3 is formed by drilling, the water pump 21 connected with a water level controller is placed at the bottom of the water collecting well 3, the drainage pipe 22 connected with the water pump is led out to the surface drainage ditch, the water outlets of all the siphon pipes 11 are arranged together and then are bound and placed in the water collecting well 3, the position of the water outlet of the siphon pipe 11 is kept to be greater than 12 m below the ground surface, the sealing film 41 is covered on the ground surface around the water collecting well 3, one end of the air extraction pipe 42 is placed in the water collecting well 3, and the other end is connected with the vacuum pump 43;

[0071] Step 2: the air is extracted through the air extraction pipe 42, the negative pressure in the water collecting well 3 is kept to be 3-5 m of water head height, the underground water in the soft soil foundation is caused to flow into the water collecting well 3 through the siphon pipes 11, and the air extraction is stopped when all the siphon pipes 11 are filled with water;

[0072] Step 3: the connection between the air extraction pipe 42 and the vacuum pump 43 is released, the water collecting well 3 is kept to be communicated with the outside air through the air extraction pipe 42, the water pump 21 is started to extract water, the water level of the water collecting well 3 is reduced to 15 m below the ground surface, the siphon group pipe 1 starts to work normally, the water in the soft soil foundation is caused to flow into the water collecting well 3 through the siphon action, and is discharged to the surface drainage ditch through the drainage pipe 22 connected with the water pump 21.

[0073] The above-mentioned embodiments are only the preferred schemes of the present application, and do not limit the present application in any form, and other variants and modifications can be made without departing from the technical scheme recited in the claims.

Claims

1. A pressure-reducing start-up device for a drainage siphon group pipe in soft soil foundation, characterized in that, include: A siphon group consists of several siphon pipes. The outlet of the siphon group is located in the collection well, the inlet of the siphon group is located in the soft soil foundation, and the outlet of the siphon group is located below the horizontal plane of the inlet. A drainage device, located at the bottom of the collection well, is used to drain the water from the collection well; Vacuum pumping unit, used to expel air from inside the siphon manifold; The vacuum pumping assembly includes a vacuum box and a pumping pipe. The vacuum box is slidably mounted on the side wall of the water collection well, and the vacuum box is connected to a cable that pulls it to slide along the side wall. One end of the suction pipe is connected to the vacuum box, and the other end of the suction pipe is connected to the vacuum pump. The top plate of the vacuum box has several upper through holes, and the bottom plate of the vacuum box has several lower through holes. The siphon tube passes through the upper and lower through holes and runs through the vacuum box. Several water channels are provided on the side wall of the siphon tube.

2. The soft soil foundation drainage siphon group pipe air extraction and pressure reduction start-up device according to claim 1, characterized in that, The vacuum pumping assembly includes: A sealing cap is used to seal the wellhead of a water collection well, thus forming a closed cavity in the water collection well. The extraction pipe has one end installed in the sealed cavity formed by the water collection well and the sealing cover, and the other end connected to the vacuum pump.

3. The soft soil foundation drainage siphon group pipe air extraction and pressure reduction start-up device according to claim 2, characterized in that, The sealing cover is a sealing membrane; the diameter of the sealing membrane is greater than 6m with the water collection well as the center.

4. The soft soil foundation drainage siphon group pipe air extraction and pressure reduction start-up device according to any one of claims 1 to 3, characterized in that, The diameter of the water collection well is 0.8m to 1.2m, and the depth of the water collection well is 18m to 20m; The vertical distance between the water outlet and the wellhead of the water collection well is greater than 15m; The drainage device is located 0.4m to 0.6m from the bottom of the collection well.

5. The soft soil foundation drainage siphon group pipe air extraction and pressure reduction start-up device according to claim 1, characterized in that, The siphon is a rigid tube; the outer wall of the siphon is fixedly provided with an upper sealing platform and a lower sealing platform corresponding to the upper and lower through holes respectively, and several water flow channels are provided on the side wall of the siphon between the lower sealing platform and the upper sealing platform.

6. The soft soil foundation drainage siphon group pipe air extraction and pressure reduction start-up device according to claim 5, characterized in that, Both the upper and lower sealing platforms are designed in the shape of an inverted frustum, and the upper and lower through holes are designed as conical surfaces that mate with the inverted frustum shape.

7. The soft soil foundation drainage siphon group pipe air extraction and pressure reduction start-up device according to claim 5 or 6, characterized in that, A slide rail is vertically installed on the side wall of the water collection well, and a pulley that cooperates with the slide rail is installed on the vacuum box. The pulley and the slide rail slide together.

8. The soft soil foundation drainage siphon group pipe air extraction and pressure reduction start-up device according to claim 5 or 6, characterized in that, A guide rod is provided below the lower sealing platform of the siphon tube, and the diameter of the guide rod is smaller than the diameter of the siphon tube.

9. A method for starting up a drainage siphon system on soft soil foundation by depressurization and air extraction, comprising the depressurization and air extraction device for starting up a drainage siphon system on soft soil foundation as described in claim 1, 2, or 3, characterized in that... Includes the following steps: Step 1: Drill a hole to form a water collection well. Place a water pump connected to a water level controller at the bottom of the water collection well. Lead the drain pipe connected to the water pump to the surface drainage ditch. Gather all the outlets of the siphon pipes together, tie them up, and put them into the water collection well. Keep the position of the siphon pipe outlets at a depth greater than 12m below the ground surface. Cover the ground surface centered on the water collection well with a sealing film. Put one end of the air extraction pipe into the water collection well and connect the other end to the vacuum pump. Step 2: Extract air through the extraction pipe to maintain a negative pressure of 3-5m water head in the well, causing the groundwater in the soft soil foundation to flow into the collection well through the siphon pipe. Stop extracting air after all the siphon pipes are full of water. Step 3: Disconnect the air extraction pipe from the vacuum pump and keep the water collection well connected to the outside air through the air extraction pipe. Start the water pump to pump water, so that the water level in the water collection well is lowered to 15m below the ground surface. The siphon pipe group will start working normally, allowing the water in the soft soil foundation to flow into the water collection well through the siphon effect and be discharged into the surface drainage ditch through the drainage pipe connected to the water pump.

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