A method for starting drainage by inflating and pressurizing siphon pipes in soft soil foundation

Abstract

The present invention discloses a method for starting drainage by inflating and pressurizing a siphon group pipe on a soft soil foundation, which aims to solve the problems of poor drainage and consolidation effect of the soft soil foundation, inconvenient operation of filling and starting the siphon pipe with water, and low efficiency. The present invention uses a plurality of siphon pipes to siphon water from various positions of the soft soil foundation into a water collection well for centralized pumping and drainage, which has high working efficiency, good drainage and consolidation effect on the soft soil foundation, can shorten the drainage and consolidation processing time, and reduce costs. The siphon pipe needs to be filled with water before working, and in the present application, the water in the water collection well is reversely filled into the siphon pipe by inflating and pressurizing the water collection well, which can achieve the goal of filling all siphon pipes with water at one time, completing the start-up of the siphon pipe, and can greatly reduce labor costs.

Description

Technical Field

[0001] The present invention relates to the technical field of geotechnical engineering, and more particularly to a method for starting drainage by inflating and pressurizing a siphon group pipe on a soft soil foundation. Background Art

[0002] At present, there are a lot of soft soils distributed in my country's coastal and riverside cities. For production and life, it is often necessary to build buildings on these soft soil foundations. Buildings built on soft soil foundations are prone to excessive foundation settlement, and the duration of foundation consolidation settlement is very long. The natural drainage and consolidation time may last for decades to hundreds of years. Excessive post-construction settlement often affects the normal use of the project and even causes engineering disasters. Therefore, when building buildings on soft soil foundations, it is often necessary to artificially drain and consolidate the soft soil foundation first. Commonly used drainage consolidation methods include loading preloading method and vacuum preloading method. These methods have good drainage and consolidation effects on shallow soft soil, but are not effective for deep soft soil. In addition, the drainage and consolidation treatment time is long and the cost is high. Summary of the Invention

[0003] In order to overcome the above-mentioned shortcomings, the present invention provides a method for starting drainage of a siphon group pipe by inflation and pressurization on a soft soil foundation. The drainage and consolidation effect of the soft soil foundation is good. Water is filled into the siphon group pipe by inflation and pressurization, so that the siphon group pipe can be started quickly at one time, thereby improving the starting efficiency of the siphon group pipe and saving the manpower cost of starting the siphon group pipe.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solution: a siphon group pipe inflation and pressurization start-up drainage method for soft soil foundation, comprising the following steps:

[0005] S1, drilling to form a water collection well;

[0006] S2, install a water pump, extend the water inlet of the water pump to the bottom of the water collection well, and extend the drainage pipe connected to the water pump to the surface drainage ditch outside the water collection well;

[0007] S3, installing siphon pipes, installing the water inlets of the siphon pipes into the soft soil foundation, arranging and bundling all the water outlets of the siphon pipes to form a siphon pipe group and placing it into the water collection well, with the water outlet height of the siphon pipes being lower than the water inlet height;

[0008] S4, insert one end of the inflation tube into the water collection well, connect the other end of the inflation tube to the inflation pump, lay a sealing film on the surface above the water collection well, and cover the water collection well with the sealing film to form a closed space in the water collection well;

[0009] S5, while ensuring that the outlet of the siphon tube is immersed in the water in the water collection well, start the air pump, and inflate the water collection well through the air pipe, thereby increasing the air pressure in the water collection well, so that the water in the water collection well is reversely pressed into the siphon tube through the outlet of the siphon tube and discharged from the water inlet of the siphon tube into the soft soil foundation. When all the siphon tubes are filled with water, stop inflating;

[0010] S6, the air pump is stopped, the connection between the air pipe and the air pump is disconnected, and the air connection between the water collection well and the external environment is maintained through the air pipe;

[0011] S7, start the water pump to pump out the water in the water collection well. After the water level in the water collection well is lower than the water inlet of the siphon pipe, the water in the soft soil foundation is sucked into the water collection well along the siphon pipe by the siphon effect, thereby achieving drainage and consolidation of the soft soil foundation.

[0012] In the technical solution of the present invention, water from various locations of the soft soil foundation is siphoned and concentrated into a water collection well through a plurality of siphon tubes for centralized pumping and drainage. The working efficiency is high, the drainage and consolidation effect of the soft soil foundation is good, the drainage and consolidation treatment time can be shortened, and the cost is reduced. The siphon tube needs to be filled with water before working. In the present application, the water in the water collection well is reversely filled into the siphon tube by inflating and pressurizing the water collection well, so that all siphon tubes can be filled with water at one time, and the siphon tube is started, which can greatly reduce the labor cost. Generally, hundreds of siphon tubes need to be placed in the water collection well. It is easy to cause tangling when the siphon tubes are manually started to enter the working state, and it is even more difficult to start the siphon repeatedly. The present application uses the method of inflation and pressurization to start the siphon tube, which is easy to operate and will not cause the siphon tube to knot. Moreover, when the siphon tube needs to be started repeatedly, it is only necessary to repeat step S5, which is very convenient.

[0013] Preferably, the water outlet of the siphon pipe in S3 is located at a depth greater than 12 m below the ground surface.

[0014] The water outlet depth of the siphon is set reasonably to ensure the drainage depth of the soft soil foundation.

[0015] Preferably, the inflation pressure of the air pump in S5 on the water collection well is maintained at a head height of 3 to 5 m.

[0016] The inflation pressure is controlled within a certain range to ensure that the water flow can fill the siphon.

[0017] Preferably, after the water level in the water collection well in S7 drops to 10 m below the ground surface, the siphon pipe starts to work to siphon water in the soft soil foundation into the water collection well.

[0018] The water outlet depth of the siphon is set within a certain range to ensure the drainage depth of the soft soil foundation and the drainage consolidation effect.

[0019] Preferably, one end of the inflation tube inserted into the water collection well is placed above the liquid level in the water collection well.

[0020] The inflation pipe increases the pressure in the space above the water surface in the water collection well, making it easier to press the water in the water collection well into the siphon pipe.

[0021] Preferably, the diameter of the water collection well is 0.8~1.2m, the depth is 18~20m, and the coverage area of ​​the sealing film is larger than the 6m diameter range from the center of the water collection well.

[0022] The sealing film has a large coverage area, ensuring the sealing effect of the water collection well.

[0023] Preferably, the water pump is a submersible pump, and the water inlet of the submersible pump is 0.5m away from the bottom of the water collection well.

[0024] Submersible pumps have low failure rates and good performance, and are important equipment for deep well water extraction.

[0025] Preferably, in S3, a water collection pipe is connected to the water inlet end of the siphon pipe, the water collection pipe is placed in a soft soil foundation, a lifting seat with a lifting arrangement is installed in the water collection pipe, a floating body is connected to the lifting seat, a liftable sealing plug is installed at the water inlet position in the siphon pipe, a sealing convex ring is provided above the sealing plug in the siphon pipe, and a plurality of flow grooves are provided on the outer edge of the sealing plug. When the sealing plug is in the highest position, the sealing convex ring is sealed. A connecting rod is rotated in the water collection pipe, and long grooves are provided at both ends of the connecting rod. Connecting pins are movably connected in the long grooves, and the two connecting pins are respectively connected to the lifting seat and the sealing plug; when the water level in the water collection pipe drops, the lifting seat and the floating body drop together, and the sealing plug is pushed upward by the connecting rod. When the water level in the water collection pipe is lower than the water inlet of the siphon pipe, the sealing plug is in the highest position, and the sealing plug seals and covers the sealing convex ring.

[0026] In step S5, when the siphon is filled with water, the high pressure in the water collection well pushes the sealing plug downward, connecting the flow groove and the inner hole of the sealing convex ring. At this time, water can flow from the water collection well into the siphon. In step S7, the siphon siphons water in the soft soil foundation into the water collection well. The water in the soft soil foundation first seeps into the water collection pipe and is then siphoned from the pipe into the siphon. Under the action of buoyancy, the float and the lifting seat float together on the water surface in the water collection pipe. When the water level in the water collection pipe drops, the lifting seat and the float descend together, pushing the sealing plug upward through the connecting rod. When the water level in the water collection pipe is lower than the water inlet of the siphon, the sealing plug is in the highest position, and the sealing plug seals the sealing convex ring. At this time, the water inlet of the siphon is closed by the sealing plug, the water flow in the siphon remains stationary, and the water outlet of the siphon will not cause the water flow in the siphon to flow out. When the water level in the water collection pipe rises to the water inlet of the siphon pipe, the lifting seat and the float rise together, pushing the sealing plug downward through the connecting rod. The inner hole of the sealing convex ring is slowly opened, and the water flow in the water collection pipe can be siphoned into the water collection well by the siphon pipe. This method can prevent the siphon pipe from being cut off and eliminate the need for secondary water filling, which facilitates operation.

[0027] Preferably, a vertically arranged chute is provided in the water collection pipe, the lifting seat and the float are arranged in the chute and can be lifted and lowered, the lower end of the lifting seat is connected to the counterweight guide rod, the guide sleeve is connected in the chute, and the counterweight guide rod and the guide sleeve are adapted to be assembled together.

[0028] The lifting seat and float move up and down in the chute smoothly and reliably. The counterweight guide rod not only fulfills the counterweight function, but also plays a guiding role, improving the stability of the lifting seat and float during the lifting process.

[0029] Preferably, a limit block for limiting the float is provided above the float in the water collection pipe, and a connecting column extending downward from the water inlet of the siphon tube is provided at the lower end of the sealing plug, and the connecting rod is connected to the connecting column through a connecting pin.

[0030] The limit block limits the rising distance of the float to prevent the sealing plug from sliding away from the water inlet of the siphon pipe.

[0031] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) the soft soil foundation siphon pipe group inflation and pressurization start-up drainage method of the present invention has a good drainage and consolidation effect on the soft soil foundation. The siphon pipe group is filled with water by inflation and pressurization, so that the siphon pipe group is quickly started at one time, which improves the starting efficiency of the siphon pipe group and helps to save the manpower cost of starting the siphon pipe group; (2) the siphon pipe is not prone to interruption after completing the water filling once, thereby avoiding the secondary water filling operation of the siphon pipe, simplifying the operation and improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of embodiment 1 of the present invention;

[0033] Figure 2 This is a schematic diagram of embodiment 2 of the present invention;

[0034] Figure 3 This is a partial structural diagram of the water collection pipe position in Example 2 of the present invention;

[0035] In the figure: 1. water collection well, 2. water pump, 3. drainage pipe, 4. drainage ditch, 5. siphon tube, 6. siphon tube group, 7. inflation tube, 8. inflation pump, 9. sealing membrane, 10. water collection pipe, 11. lifting seat, 12. float, 13. slide, 14. counterweight guide rod, 15. guide sleeve, 16. sealing plug, 17. sealing convex ring, 18. flow groove, 19. connecting rod, 20. long groove, 21. connecting pin, 22. limit block, 23. connecting column. DETAILED DESCRIPTION

[0036] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0037] Example 1: A method for starting drainage by inflating and pressurizing a siphon pipe group on a soft soil foundation (see attached Figure 1 ), including the following steps:

[0038] S1, drilling to form water collection well 1;

[0039] S2, install a water pump 2, the water inlet of the water pump extends to the bottom of the water collection well, and the drainage pipe 3 connected to the water pump extends to the surface drainage ditch 4 outside the water collection well; the water pump is a submersible pump, and the water inlet of the submersible pump is 0.5m away from the bottom of the water collection well;

[0040] S3, install the siphon pipe 5, install the water inlet of the siphon pipe into the soft soil foundation, arrange all the water outlets of the siphon pipe together and bundle them to form a siphon pipe group 6, and place it into the water collection well. The height of the water outlet of the siphon pipe is lower than the height of the water inlet; the depth of the water outlet of the siphon pipe is greater than 12m below the ground surface;

[0041] S4. Insert one end of the inflation tube 7 into the water collection well, connect the other end of the inflation tube to the inflation pump 8, and place the end of the inflation tube inserted into the water collection well above the liquid level in the water collection well; lay a sealing film 9 on the surface above the water collection well, and the sealing film covers the water collection well to form a closed space in the water collection well; the water collection well has a diameter of 0.8-1.2m and a depth of 18-20m. In this embodiment, the water collection well has a diameter of 1m and a depth of 20m. The sealing film covers an area larger than the 6m diameter range from the center of the water collection well outward;

[0042] S5. While ensuring that the outlet of the siphon pipe is submerged in the water in the water collection well, start the air pump. The air pipe inflates the water collection well to increase the air pressure in the water collection well. The air pump maintains the inflation pressure of the water collection well at a head height of 3-5m, so that the water in the water collection well is reversely pressed into the siphon pipe from the outlet and discharged from the water inlet of the siphon pipe into the soft soil foundation. Stop inflation when all siphon pipes are filled with water.

[0043] S6, the air pump is stopped, the connection between the air pipe and the air pump is disconnected, and the air connection between the water collection well and the external environment is maintained through the air pipe;

[0044] S7: Start the pump to pump water out of the collection well. The pump head should be greater than 30 meters. Once the water level in the collection well drops below the water inlet of the siphon pipe, the water in the soft soil foundation is drawn along the siphon pipe into the collection well, thereby draining and consolidating the soft soil foundation. Once the water level in the collection well drops to 10 meters below the ground surface, the siphon pipe begins to operate, siphoning the water from the soft soil foundation into the collection well.

[0045] In the technical solution of the present invention, water from various positions of the soft soil foundation is siphoned and concentrated into a water collection well through a plurality of siphon tubes for centralized pumping and drainage, which has high working efficiency and good drainage and consolidation effect on the soft soil foundation. The siphon tube needs to be filled with water before working, and in the present application, the water in the water collection well is reversely filled into the siphon tube by inflating and pressurizing the water collection well, which can achieve the goal of filling all siphon tubes with water at one time, completing the startup of the siphon tube, and can greatly reduce labor costs. Generally, hundreds of siphon tubes need to be placed in a water collection well, and it is easy to cause knotting when the siphon tubes are manually started to enter the working state, and it is even more difficult to repeatedly start the siphon. The present application uses the method of inflation and pressurization to start the siphon tube, which is easy to operate and will not cause the siphon tube to knot. Moreover, when the siphon tube needs to be started repeatedly, it is only necessary to repeat step S5, which is very convenient.

[0046] Example 2: A method for starting drainage by inflating and pressurizing a siphon pipe group on a soft soil foundation (see attached Figure 2 , Attachment Figure 3 ), the process steps are similar to those of Example 1, the main difference being that in this embodiment, a water collection pipe 10 is connected to the water inlet end of the siphon pipe at S3, the water collection pipe is placed in a soft soil foundation, and seepage holes are provided on the water collection pipe. The water flow in the soft soil foundation is collected into the water collection pipe through the seepage holes.

[0047] A lifting seat 11 is installed in the water collection pipe, and a floating body 12 is connected to the lifting seat. A vertically arranged chute 13 is provided in the water collection pipe. The lifting seat and the floating body are arranged in the chute and can be lifted and lowered. The lower end of the lifting seat is connected to a counterweight guide rod 14, and a guide sleeve 15 is connected in the chute. The counterweight guide rod and the guide sleeve are adapted to be assembled together.

[0048] A liftable sealing plug 16 is installed at the water inlet of the siphon tube. A sealing cam 17 is located above the sealing plug, and several flow grooves 18 are located on the outer edge of the sealing plug. When the sealing plug is in its highest position, the sealing cam is sealed. A connecting rod 19 is pivoted inside the water collection pipe. The connecting rod is hinged to the side of the chute, and each end of the connecting rod has a long slot 20. Connecting pins 21 are movably connected in the long slot. The two connecting pins are respectively connected to the lifting seat and the sealing plug. A limit block 22 is located above the float in the water collection pipe to limit the float. The limit block is set on the chute. A connecting column 23 is provided at the lower end of the sealing plug, extending downward from the water inlet of the siphon tube. The connecting rod is connected to the connecting column via a connecting pin.

[0049] When the water level in the water collection pipe drops, the lifting seat and the float drop together, pushing the sealing plug upward through the connecting rod. When the water level in the water collection pipe is lower than the water inlet of the siphon pipe, the sealing plug is in the highest position, and the sealing plug seals the sealing convex ring.

[0050] In step S5, when the siphon is filled with water, the high pressure in the water collection well pushes the sealing plug downward, connecting the flow groove and the inner hole of the sealing convex ring. At this time, water can flow from the water collection well into the siphon. In step S7, the siphon siphons water in the soft soil foundation into the water collection well. The water in the soft soil foundation first seeps into the water collection pipe and is then siphoned from the pipe into the siphon. Under the action of buoyancy, the float and the lifting seat float together on the water surface in the water collection pipe. When the water level in the water collection pipe drops, the lifting seat and the float descend together, pushing the sealing plug upward through the connecting rod. When the water level in the water collection pipe is lower than the water inlet of the siphon, the sealing plug is in the highest position, and the sealing plug seals the sealing convex ring. At this time, the water inlet of the siphon is closed by the sealing plug, the water flow in the siphon remains stationary, and the water outlet of the siphon will not cause the water flow in the siphon to flow out. When the water level in the water collection pipe rises to the siphon inlet, the lifting seat and float rise together, pushing the sealing plug downward via the connecting rod. The inner hole of the sealing convex ring is slowly opened, and the water in the water collection pipe can be siphoned into the water collection well by the siphon. The other steps are the same as in Example 1. This method can prevent the siphon from being cut off, eliminating the need for secondary water filling, and facilitating operation.

[0051] The above-described embodiments are only preferred solutions of the present invention and are not intended to limit the present invention in any form. Other variations and modifications are possible without exceeding the technical solutions described in the claims.

Claims

1. A soft soil foundation siphon group pipe inflation and pressurization start-up drainage method, characterized by: The following steps are involved: S1, drilling to form a water collection well; S2, install a water pump, extend the water inlet of the water pump to the bottom of the water collection well, and extend the drainage pipe connected to the water pump to the surface drainage ditch outside the water collection well; S3, installing siphon pipes, installing the water inlets of the siphon pipes into the soft soil foundation, arranging and bundling all the water outlets of the siphon pipes to form a siphon pipe group and placing it into the water collection well, with the water outlet height of the siphon pipes being lower than the water inlet height; S4, insert one end of the inflation tube into the water collection well, connect the other end of the inflation tube to the inflation pump, lay a sealing film on the surface above the water collection well, and cover the water collection well with the sealing film to form a closed space in the water collection well; S5, while ensuring that the outlet of the siphon tube is immersed in the water in the water collection well, start the air pump, and inflate the water collection well through the air pipe, thereby increasing the air pressure in the water collection well, so that the water in the water collection well is reversely pressed into the siphon tube through the outlet of the siphon tube and discharged from the water inlet of the siphon tube into the soft soil foundation. When all the siphon tubes are filled with water, stop inflating; S6, the air pump is stopped, the connection between the air pipe and the air pump is disconnected, and the air connection between the water collection well and the external environment is maintained through the air pipe; S7, start the water pump to pump out the water in the water collection well. When the water level in the water collection well is lower than the water inlet of the siphon pipe, the water in the soft soil foundation is sucked by the siphon pipe and flows into the water collection well along the siphon pipe, thereby achieving drainage and consolidation of the soft soil foundation. In S3, a water collection pipe is connected to the water inlet end of the siphon pipe, the water collection pipe is placed in a soft soil foundation, a lifting seat with a lifting arrangement is installed in the water collection pipe, a floating body is connected to the lifting seat, and a liftable sealing plug is installed at the water inlet position of the siphon pipe; a connecting rod is rotated in the water collection pipe, and long grooves are provided at both ends of the connecting rod, and connecting pins are movably connected in the long grooves, and the two connecting pins are respectively connected to the lifting seat and the sealing plug; the water level in the water collection pipe drops, the lifting seat and the floating body drop together, and the sealing plug is pushed upward by the connecting rod, and the water inlet of the siphon pipe is closed by the sealing plug.

2. A soft soil foundation siphon group pipe inflation and pressurization start-up drainage method according to claim 1, characterized in that: The location of the siphon outlet in S3 is greater than 12m below the ground surface.

3. The method for starting drainage by aerating and pressurizing a siphon pipe group on a soft soil foundation according to claim 1 is characterized in that: The air pump in S5 maintains the inflation pressure of the water collection well at a head height of 3~5m.

4. The method for starting drainage by aerating and pressurizing a siphon pipe group on a soft soil foundation according to claim 1 is characterized in that: After the water level in the water collection well in S7 drops to 10m below the ground surface, the siphon pipe starts to work and siphons the water in the soft soil foundation into the water collection well.

5. The method for starting drainage by inflating and pressurizing a siphon pipe group on a soft soil foundation according to claim 1 is characterized in that: One end of the inflation tube is inserted into the water collection well and is placed above the liquid level in the water collection well.

6. The method for starting drainage by inflating and pressurizing a siphon pipe group on a soft soil foundation according to claim 1 is characterized in that: The diameter of the water collection well is 0.8~1.2m, the depth is 18~20m, and the coverage area of ​​the sealing membrane is larger than the 6m diameter range from the center of the water collection well.

7. A soft soil foundation siphon group pipe inflation and pressurization start-up drainage method according to any one of claims 1 to 6, characterized in that: The water pump is a submersible pump, and the water inlet of the submersible pump is 0.5m away from the bottom of the collection well.

8. A soft soil foundation siphon group pipe inflation and pressurization start-up drainage method according to any one of claims 1 to 6, characterized in that: A sealing convex ring is provided above the sealing plug in the siphon tube, and a number of flow grooves are provided on the outer edge of the sealing plug. When the sealing plug is in the highest position, the sealing convex ring is sealed; when the water level in the water collection pipe is lower than the water inlet of the siphon tube, the sealing plug is in the highest position and the sealing plug seals the sealing convex ring.

9. The method for starting drainage by aerating and pressurizing a siphon pipe group on a soft soil foundation according to claim 8 is characterized in that: A vertically arranged chute is provided in the water collection pipe. The lifting seat and the float are arranged in the chute and can be lifted and lowered. The lower end of the lifting seat is connected to the counterweight guide rod, and the guide sleeve is connected in the chute. The counterweight guide rod and the guide sleeve are assembled together.

10. The method for starting drainage by inflating and pressurizing a siphon pipe group on a soft soil foundation according to claim 8, characterized in that: A limiting block for limiting the float is provided above the float in the water collection pipe, and a connecting column extending downward from the water inlet of the siphon pipe is provided at the lower end of the sealing plug, and the connecting rod is connected to the connecting column through a connecting pin.

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