A dual-siphon outlet triple-negative-pressure enhanced drainage system using an anchor hole and an installation cavity

Abstract

The present invention relates to a dual-siphon outlet triple-negative-pressure enhanced drainage system and an installation cavity using an anchor hole, which is applicable to slope drainage. The cavity of the siphon drainage device is divided into a zero-pressure area and a negative-pressure area, and is equipped with components such as an exhaust pipe, a gas injection pipe, a siphon pipe and a front-end control device, etc., to ensure automatic start and stop, and at the same time prevent air from entering the siphon pipe to damage the siphon. The siphon pipe is provided with a U-shaped section and a front-end control device, realizing a double insurance mechanism, and the capillary drainage belt enhances the drainage effect. This drainage system utilizes the existing slope anchor bolt holes for installation, reducing the cost of additional drilling, and forms a siphon layer by layer through a switch control valve, optimizing the working efficiency when there is multi-layer drainage.

Description

Technical Field

[0001] The present invention belongs to the technical field of slope drainage, and particularly relates to a double-siphon outlet three-negative-pressure enhanced drainage system using anchor holes and an installation cavity. Background Art

[0002] Engineering experience shows that rainfall is the main cause of slope instability. During the construction of foundation pits, for the slopes formed during the construction process, in addition to using support structures to support and protect the slopes, construction workers will also set up drainage structures for drainage to reduce the situation where rainwater infiltration causes the slope soil to become loose and reduces the stability of the slope support for the slope. During the excavation of the foundation pit, it is necessary to timely drain and dewater the formed slopes. Once the drainage and dewatering are not carried out in time, it will affect the slope safety, and further affect the structural safety and normal operation of the building.

[0003] The siphon phenomenon is a principle of fluid mechanics. It occurs in a completely closed pipeline. When the liquid flow in the pipeline suddenly stops, due to the negative pressure in the pipeline, the liquid will rise along the pipeline from the low place to the high place, forming a siphon phenomenon. Those skilled in the art usually start the siphon by the air extraction method, that is, evacuating the air in the siphon pipeline by pumping vacuum from the exhaust pipe at the first start; or using the water injection method, that is, injecting water into the tail of the drain pipe. However, neither can achieve automatic start and stop, cannot ensure a large water discharge flow rate, nor can ensure no air entry. Summary of the Invention

[0004] The purpose of the present invention is to provide a double-siphon outlet three-negative-pressure enhanced drainage system using anchor holes and an installation cavity, which solves the problem of inability to achieve automatic start and stop, can expand the water discharge flow rate, and at the same time avoids the problem of siphon breakage caused by air entry.

[0005] The technical solution adopted by the present invention is a double-siphon outlet three-negative-pressure enhanced drainage system using anchor holes, including a siphon drainage device cavity, and the siphon drainage device cavity is divided into a zero-pressure area and a negative-pressure area;

[0006] Further, a zero-pressure area and an atmospheric top cover are arranged above the zero-pressure area, a zero-pressure area and a negative-pressure area top cover are arranged between the zero-pressure area and the negative-pressure area, and an air-inflating expansion plug is arranged between the negative-pressure area and the grouting section;

[0007] Further, an exhaust pipe 1 passes through an exhaust pipe hole 1 of the zero-pressure area and the atmospheric top cover and the zero-pressure area and the negative-pressure area top cover, and the exhaust pipe 1 is fixed on the zero-pressure area and the atmospheric top cover and the zero-pressure area and the negative-pressure area top cover; an exhaust pipe 2 passes through an exhaust pipe hole 2 of the zero-pressure area and the atmospheric top cover, and the exhaust pipe 2 is fixed on the zero-pressure area and the atmospheric top cover;

[0008] Further, the gas supply pipe sequentially passes through the gas supply pipe holes on the atmospheric top cover between the zero-pressure zone and the negative-pressure zone top cover between the zero-pressure zone, and fixes the gas supply pipe on the atmospheric top cover between the zero-pressure zone and the negative-pressure zone top cover between the zero-pressure zone. The tail end of the gas supply pipe is inserted into the hole reserved in the gas supply expansion plug.

[0009] Further, the first siphon pipe passes through the second siphon pipe hole on the atmospheric top cover between the zero-pressure zone, and fixes the first siphon pipe on the atmospheric top cover between the zero-pressure zone. The second siphon pipe passes through the first siphon pipe hole on the atmospheric top cover between the zero-pressure zone and the negative-pressure zone top cover between the zero-pressure zone, and fixes the second siphon pipe on the atmospheric top cover between the zero-pressure zone and the negative-pressure zone top cover between the zero-pressure zone.

[0010] Further, the outer sides of the zero-pressure zone and the negative-pressure zone of the siphon drainage device cavity are respectively wrapped with plastic pipes. A capillary drainage belt is wrapped outside the plastic pipes. Expansion mud balls are arranged in the gaps of the capillary drainage belt. An annular water retaining device is arranged outside the lower part of the capillary drainage belt. A herringbone water guiding device and a gate-shaped three-sided water retaining device are alternately arranged below the capillary drainage belt.

[0011] Further, the first siphon pipe is arranged in the zero-pressure zone. U-shaped sections are arranged at the tail ends of the first siphon pipe and the second siphon pipe. A front-end control device is arranged at the top of the U-shaped section. A one-way switch flap is arranged behind the front-end control device.

[0012] Further, the front-end control device includes a plastic float, a hollow large ball and a solid iron ball. A vertical channel for the solid iron ball to move is arranged along the diameter direction inside the hollow large ball. The plastic float and the solid iron ball are connected by a thin wire. A perforated baffle is arranged above the front-end control device.

[0013] Further, the gas supply expansion plug is divided into three sections. The upper and lower sections are metal sections, and the middle section is a rubber section. The upper and lower metal sections are both provided with holes reserved for the grouting pipe and the slurry return pipe. The upper metal section is also provided with a hole reserved for the gas supply pipe.

[0014] Further, the grouting pipe sequentially passes through the grouting pipe holes on the atmospheric top cover between the zero-pressure zone and the negative-pressure zone top cover between the zero-pressure zone and the holes reserved in the metal part of the gas supply expansion plug, and fixes the grouting pipe on the atmospheric top cover between the zero-pressure zone and the negative-pressure zone top cover between the zero-pressure zone and the metal part of the gas supply expansion plug.

[0015] Further, the slurry return pipe sequentially passes through the slurry return pipe holes on the atmospheric top cover between the zero-pressure zone and the negative-pressure zone top cover between the zero-pressure zone and the holes reserved in the metal part of the gas supply expansion plug, and fixes the slurry return pipe on the metal part of the gas supply expansion plug and the atmospheric top cover between the zero-pressure zone and the negative-pressure zone top cover between the zero-pressure zone.

[0016] Further, exhaust valves are arranged at one ends of the first exhaust pipe and the second exhaust pipe outside the siphon drainage device cavity.

[0017] Another technical solution adopted by the present invention is to utilize the double-siphon outlet of the anchor hole to enhance the installation cavity of the drainage system with three negative pressures. The drainage system with three negative pressures enhanced by the double-siphon outlet of the anchor hole is installed in the installation cavity of the siphon drainage device. The first siphon pipe and the second siphon pipe on the same layer are both connected in series. A zero-pressure zone control valve and a negative-pressure zone control valve are respectively installed at the outlets of the first siphon pipe and the second siphon pipe close to the installation cavity of the siphon drainage device. The layers are connected in parallel, and a main control valve is set for each layer. A water tank is arranged at the end of the connected siphon pipes, and a water tank drain pipe is also arranged on the water tank.

[0018] Further, the installation cavity of the siphon drainage device is a hole drilled in the slope for installing the anchor rod. The anchor rod passes through the anchor rod holes on the atmospheric top cover of the zero-pressure zone and the top cover of the zero-pressure zone and the negative-pressure zone, and the anchor rod is fixed on the atmospheric top cover of the zero-pressure zone and the top cover of the zero-pressure zone and the negative-pressure zone; the anchor rod includes a free section and an anchorage section, and the anchorage section is fixed in the slope body, and a collar beam is also arranged on the free section.

[0019] The beneficial effects of the present invention are as follows:

[0020] 1. The present invention realizes the injection of water from the water tank at the end of the siphon pipe into the siphon pipe to form siphon and the discharge of accumulated water in the slope by positive flowing water, so that the siphon drainage of the slope is no longer affected by the height of the water outlet at the rear end.

[0021] 2. The present invention is provided with double floating balls and a double-insurance mechanism at the front-end water inlet, which can effectively ensure that the siphon is not damaged.

[0022] 3. The present invention is provided with a negative-pressure zone, which further enhances the drainage effect.

[0023] 4. The present invention utilizes the holes drilled by the anchor rod for the slope anchoring support, and does not need to drill holes on the slope surface for the drainage device additionally, reducing the labor and time costs. Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 It is the general layout drawing of the siphon drainage pipe.

[0026] Figure 2 It is the detailed drawing of the negative-pressure zone of the present invention.

[0027] Figure 3It is a side view when the U-shaped three-sided water retaining device of the present invention is closed.

[0028] Figure 4 It is a side view when the U-shaped three-sided water retaining device of the present invention is opened.

[0029] Figure 5 It is a sectional view of the U-shaped three-sided water retaining device and the V-shaped water guiding device when the switch control valve of the present invention is opened.

[0030] Figure 6 It is a sectional view of the U-shaped three-sided water retaining device and the V-shaped water guiding device when the switch control valve of the present invention is closed.

[0031] Figure 7 It is a schematic structural diagram of the V-shaped water guiding device of the present invention.

[0032] Figure 8 It is a detailed structural diagram of the front-end control device of the present invention.

[0033] Figure 9 It is a schematic structural diagram of the zero-pressure zone and the atmospheric top cover of the present invention.

[0034] Figure 10 It is a schematic structural diagram of the zero-pressure zone and the negative-pressure zone top cover of the present invention.

[0035] Figure 11 Schematic structural diagram of the anchor bolt of the present invention.

[0036] Figure 12 It is a schematic layout diagram of the slope of the present invention.

[0037] In the figure, 1. Exhaust pipe 1, 2. Grouting pipe, 3. Return grout pipe, 4. Anchor bolt, 5. Exhaust pipe 2, 6. Gas injection pipe, 7. Siphon 1, 8. Siphon 2, 9. Zero-pressure zone and atmospheric top cover, 10. Zero-pressure zone and negative-pressure zone top cover, 11. Gas injection expansion plug, 12. Annular water retaining device, 13. Capillary drainage belt, 14. Expanded mud ball, 15. U-shaped three-sided water retaining device, 16. Plastic pipe, 17. V-shaped water guiding device, 18. Siphon drainage device cavity, 19. Plastic floating body, 20. Hollow large ball, 21. Solid iron ball, 22. Front-end control device, 23. Exhaust pipe hole 1, 24. Grouting pipe hole, 25. Return grout pipe hole, 26. Anchor bolt hole, 27. Exhaust pipe hole 2, 28. Gas injection pipe hole, 29. Siphon hole 1, 30. Siphon hole 2, 31. Anchorage section, 32. Free section, 33. Waist beam, 34. Siphon drainage device placement cavity, 35-1. Main switch control valve, 35-2. Zero-pressure zone control valve, 35-3. Negative-pressure zone control valve, 36. Water tank, 37. One-way switch toggle, 38. Water tank drain pipe, 39. Perforated baffle. Detailed implementation mode

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0039] As Figures 1 to 12 shown, an embodiment of the present invention provides a double-siphon outlet triple-negative-pressure enhanced drainage system and an installation cavity using anchor holes, including a siphon drainage device cavity 18. The siphon drainage device cavity 18 is divided into a zero-pressure area and a negative-pressure area, and the part inserted into the slope and in direct contact with the soil body is the grouting section.

[0040] The zero-pressure area communicates with the atmosphere. Since this drainage system pressurizes water from the rear end of the siphon pipe, the air in the negative-pressure area and the zero-pressure area pipe body is completely discharged, thus starting the siphon.

[0041] Above the zero-pressure area, there is a zero-pressure area and atmosphere top cover 9. As Figure 9 shown, it can prevent the soil body from entering the siphon drainage device cavity 18 and causing blockage; between the zero-pressure area and the negative-pressure area, there is a zero-pressure area and negative-pressure area top cover 10. As Figure 10 shown, it is used to isolate the zero-pressure area and the negative-pressure area; between the negative-pressure area and the grouting section, there is an air-injection expansion plug 11, which can isolate the negative-pressure area and the grouting section.

[0042] An exhaust pipe 1 passes through an exhaust pipe hole 23 of the zero-pressure area and atmosphere top cover 9 and the zero-pressure area and negative-pressure area top cover 10, and the exhaust pipe 1 is fixed on the zero-pressure area and atmosphere top cover 9 and the zero-pressure area and negative-pressure area top cover 10. The tail end of the exhaust pipe 1 is arranged at the top of the negative-pressure area. When water enters the negative-pressure area cavity, the exhaust pipe 1 can discharge the gas in the negative-pressure area out of the siphon drainage device cavity 18.

[0043] An exhaust pipe 5 passes through an exhaust pipe hole 27 of the zero-pressure area and atmosphere top cover 9, and the exhaust pipe 5 is fixed on the zero-pressure area and atmosphere top cover 9. The tail end of the exhaust pipe 5 is arranged at the top of the zero-pressure area. When water enters the zero-pressure area cavity, the exhaust pipe 5 can discharge the gas in the zero-pressure area out of the siphon drainage device cavity 18.

[0044] One ends of the exhaust pipe 1 and the exhaust pipe 5 outside the siphon drainage device cavity 18 are both provided with exhaust valves. After the gas is completely discharged, the exhaust valves are manually closed to prevent air from entering the zero-pressure area and the negative-pressure area and destroying the siphon.

[0045] The air-injection expansion plug 11 is divided into three sections. The upper and lower sections are metal sections, and the middle section is a rubber section. Both the upper and lower metal sections are provided with holes reserved for a grouting pipe 2 and a return grouting pipe 3, and the upper metal section also has a hole reserved for an air-injection pipe 6.

[0046] The grouting pipe 2 sequentially passes through the grouting pipe holes 24 of the zero-pressure area and the atmospheric top cover 9 and the zero-pressure area and the negative-pressure area top cover 10, and the holes reserved in the metal part of the air-inflated expansion plug 11, and fixes the grouting pipe 2 on the zero-pressure area and the atmospheric top cover 9, the zero-pressure area and the negative-pressure area top cover 10, and the metal part of the air-inflated expansion plug 11. Cement slurry can be pressed into the grouting section through the grouting pipe 2, and the cement slurry seeps into the soil body along the gap to fill the voids, making it completely sealed, promoting the consolidation of the soil body, thereby improving the strength of the soil body in the grouting area, and preventing fracture, displacement, and deformation.

[0047] The return grouting pipe 3 sequentially passes through the return grouting pipe holes 25 on the zero-pressure area and the atmospheric top cover 9 and the zero-pressure area and the negative-pressure area top cover 10, and the holes reserved in the metal part of the air-inflated expansion plug 11, and fixes the return grouting pipe 3 on the metal part of the air-inflated expansion plug 11, the zero-pressure area and the atmospheric top cover 9, and the zero-pressure area and the negative-pressure area top cover 10. The return grouting pipe 3 can discharge the cement slurry overflowing from the grouting section into the pipe body of the drainage system.

[0048] The gas injection pipe 6 sequentially passes through the gas injection pipe holes 28 on the zero-pressure area and the atmospheric top cover 9 and the zero-pressure area and the negative-pressure area top cover 10, and fixes the gas injection pipe 6 on the zero-pressure area and the atmospheric top cover 9 and the zero-pressure area and the negative-pressure area top cover 10. The tail end of the gas injection pipe 6 is inserted into the hole reserved in the air-inflated expansion plug 11 to communicate with the rubber section of the air-inflated expansion plug 11; a switch valve is provided on the gas injection pipe 6, which is opened during gas injection and closed after gas injection is completed. The gas injection pipe 6 can be inflated by an external air injection device, so that the rubber in the space of the rubber section of the air-inflated expansion plug 11 is inflated to isolate the grouting section and the negative-pressure area.

[0049] The first siphon 7 is arranged in the zero-pressure area, passes through the second siphon hole 30 on the zero-pressure area and the atmospheric top cover 9, and fixes the first siphon 7 on the zero-pressure area and the atmospheric top cover 9. The first siphon 7 is used to discharge the water in the zero-pressure area. The tail end of the first siphon 7 is provided with a U-shaped section, and a front-end control device 22 is arranged at the top of the U-shaped section, and a one-way switch flap 37 is arranged behind the front-end control device.

[0050] The second siphon 8 passes through the first siphon hole 29 on the zero-pressure area and the atmospheric top cover 9 and the zero-pressure area and the negative-pressure area top cover 10, and fixes the second siphon 8 on the zero-pressure area and the atmospheric top cover 9 and the zero-pressure area and the negative-pressure area top cover 10. The second siphon 8 is used to discharge the water in the negative-pressure area. The tail end of the second siphon 8 is also provided with a U-shaped section, and this U-shaped section is located in the negative-pressure area. A front-end control device 22 is also arranged at the top of the U-shaped section, and a one-way switch flap 37 is also arranged behind the front-end control device.

[0051] The anchor rod 4 passes through the zero-pressure area and the anchor rod holes 26 on the atmospheric top cover 9 and the top cover 10 between the zero-pressure area and the negative-pressure area, and fixes the anchor rod 4 on the atmospheric top cover 9 between the zero-pressure area and the atmospheric top cover and the top cover 10 between the zero-pressure area and the negative-pressure area; the anchor rod 4 is inserted into the slope, and grouting is carried out through the grouting pipe 2 to fix the anchor rod 4. The anchor rod 4 includes a free section 32 and an anchoring section 31. The free section 32 is not restricted by the grouting cement and can be used to apply prestress. The anchoring section 31 is fixed in the slope body. The anchor rod 4 plays a supporting role for the slope; a collar 33 is further arranged on the free section 32. The collar 33 can fix the anchor rod 4 on the slope and transmit the anchoring force to the slope, improving the stability of the support of the anchor rod 4.

[0052] The front-end control device 22 includes a plastic floating body 19, a hollow large ball 20 and a solid iron ball 21. A vertical channel for the solid iron ball 21 to move is arranged along the diameter direction inside the hollow large ball 20. The solid iron ball 21 can move up and down in this channel. The plastic floating body 19 and the solid iron ball 21 are connected by a thin line. The size of the opening of the hollow large ball 20 is slightly smaller than the diameter of the solid iron ball 21, which can ensure that the solid iron ball 21 is always inside the hollow large ball 20; a perforated baffle 39 is further arranged above the front-end control device 22, which can ensure that the hollow large ball 20 is always inside the front-end control device 22.

[0053] In this embodiment, the entire drainage system is installed in Figure 12 the siphonic drainage device placement cavity 34 shown. After the drainage system is installed, it needs to be pressurized and filled with water once to form a siphon in both the zero-pressure area and the negative-pressure area of the siphonic drainage device cavity 18. After that, there is no need to fill with water again, and at the same time, it is ensured that air will not enter the siphonic drainage device cavity 18 through the siphon pipe to destroy the siphon, and the automatic start and stop of the drainage device can be realized. When pressurizing and filling with water, the entire siphonic drainage device cavity 18 needs to be filled with water. At this time, the water flow direction is as Figure 8 shown, and the water flow direction after forming a siphon is opposite to Figure 8 that.

[0054] When the water level in the siphonic drainage device cavity 18 rises, the original gases in the zero-pressure area and the negative-pressure area are respectively discharged into the air through the second exhaust pipe 5 and the first exhaust pipe 1. At the same time, the buoyancy of the water drives the plastic floating body 19 to float upward. The plastic floating body 19 drives the solid iron ball 21 to gradually move up to the top of the hollow large ball, and then drives the hollow large ball 20 to move upward, so that the front-end control device 22 is opened. When water overflows from the first exhaust pipe 1 or the second exhaust pipe 5, the corresponding exhaust valve is closed, and siphonic drainage starts, and the water level gradually drops.

[0055] When the water level drops, the buoyancy of the water gradually decreases. When the gravity of the solid iron ball 21 is greater than the buoyancy of the plastic floating body 19, the solid iron ball 21 drives the plastic floating body 19 to move downward. When the solid iron ball 21 sinks to the bottom of the hollow large ball 20, the hollow large ball 20 is also gradually driven by the solid iron ball 21 to the bottom of the front-end control device 22, causing the front-end control device 22 to close. At this time, the function of automatically starting and stopping drainage is completed. Before the hollow large ball 20 falls to the bottom of the front-end control device 22, the bottom of the front-end control device 22 will not close immediately, reducing the problem of repeated opening and closing of the switch and extending the service life of the accessories to a certain extent.

[0056] An upward vertical channel is also provided at the bottom of the U-shaped section at the tail ends of the first siphon 7 and the second siphon 8, and a floating body is provided. A one-way switch flap 37 is also provided at the bottom of the channel. One end of the one-way switch flap 37 is fixed to the first siphon 7 and the second siphon 8 through a pin shaft and a pin hole welded on the siphon, and the other end is connected to the floating body through a thin wire. Similar to the front-end control device 22, when the water level rises, the floating body moves upward due to the buoyancy of the water, driving the one-way switch flap 37 to open. When the water level drops, the one-way switch flap 37 pulls the floating body downward until the one-way switch flap 37 closes, ensuring that the water level at which the front-end control device 22 opens > the water level at which the front-end control device 22 closes > the water level at which the one-way switch flap 37 closes. The front-end control device 22 and the one-way switch flap 37 form a dual control mechanism to achieve double insurance, thereby ensuring that the siphon is not damaged.

[0057] The zero-pressure zone and the negative-pressure zone of the cavity 18 of the siphon drainage device are respectively wrapped with plastic pipes 16. A capillary drainage belt 13 is wrapped outside the plastic pipes 16. Expanded mud balls 14 are provided in the gaps of the capillary drainage belt 13. The expanded mud balls 14 are used to fill the gaps of the capillary drainage belt 13. An annular water retaining device 12 is provided outside the lower part of the capillary drainage belt 13. A herringbone water guiding device 17 and a gate-shaped three-sided water retaining device 15 are alternately provided below the capillary drainage belt 13. The capillary drainage belt 13 in the zero-pressure zone can collect the water in the soil body and gather the water to the bottom of the normal pressure zone. The capillary drainage belt 13 in the negative-pressure zone collects the water and gathers the water to the bottom of the negative-pressure zone.

[0058] The annular water retaining device 12 makes the water gathered in the capillary drainage belt 13 flow into the cavity 18 of the siphon drainage device. A switch valve is provided in the middle of the bottoms of the plastic pipes 16 and the capillary drainage belt 13, as Figures 5 to 6 shown. When water enters the capillary drainage belt 13, the water first gathers at the annular water retaining device 12 below the capillary drainage belt 13. When the water pressure at the annular water retaining device 12 is greater than the water pressure inside the cavity 18 of the siphon drainage device, the water flow pushes the baffle of the gate-shaped three-sided water retaining device 15 and gathers the water into the cavity 18 of the siphon drainage device.

[0059] The herringbone water guide device 17 is a structure of a triangular prism plus a rectangular parallelepiped, such as Figure 7 As shown, water can flow downward through the two sides of the triangle, which can prevent water flow blockage and play a water-guiding role.

[0060] The gate-shaped three-sided water retaining device 15 is provided with three baffles in total, the middle baffle is connected to the inner side of the capillary drainage belt 13, and the baffles on both sides are fitted with one side of the rectangular part of the herringbone water guiding device 17 and the lower ends are connected to the rectangular part; when the water pressure in the siphon drainage device cavity 18 is greater than the water pressure at the annular water retaining device 12, the middle baffle of the gate-shaped three-sided water retaining device 15 is pushed by the water flow to resist the protrusion on the annular water retaining device 12, and the baffles on both sides are also resisted by the rectangular part of the herringbone water guiding device 17, which can effectively prevent water backflow.

[0061] The zero pressure zone is a transient saturated zone. When it rains, rainwater gradually penetrates from the soil surface into the deeper soil. The water content in the soil where the zero pressure zone is located gradually increases. At this time, the zero pressure zone can quickly drain the water to prevent a large amount of water from entering the deeper soil and destroying the slope structure. The deeper negative pressure zone can drain a small amount of water that enters the deep soil layer, further protecting the soil structure of the slope.

[0062] There are multiple layers of siphon drainage device placement cavities 34 on the same layer on the slope, such as Figure 12 As shown, the siphon drainage device cavity 18 is installed in the siphon drainage device placement cavity 34, the siphon tube 1 7 and the siphon tube 2 8 are connected in series, and the siphon tube 1 7 and the siphon tube 2 8 are respectively installed with a zero-pressure differentiation control valve 35-2 and a negative-pressure differentiation control valve 35-3 at the outlet near the siphon drainage device placement cavity 34. The layers are connected in parallel, and each layer is provided with a switch main control valve 35-1.

[0063] When pressurizing and filling water into the water tank 36, first open all the switch control valves of the bottom layer, and close the switch control valves of the other layers. After the siphon is formed in the cavity 18 of the siphon drainage device, close the corresponding zero pressure distinction control valve 35-2 and negative pressure distinction control valve 35-3. After the siphon is formed in the cavity 18 of the siphon drainage device at the farthest end of this layer, the switch master control valve 35-1 of this layer is also closed. Then open the switch master control valve 35-1 of the upper layer, repeat the above operation until the siphon is formed in the cavity 18 of all siphon drainage devices, then open the water tank drainage pipe 38, open all the switch controls of the bottom layer, so that all the drainage devices at the bottom layer complete the first siphon drainage, and complete the first siphon drainage of all drainage devices in sequence. After that, there is no need to pressurize and fill water again, and the automatic start and stop of siphon drainage can be realized.

[0064] Forming a siphon successively through the on-off control valve can avoid water overflow from the relatively near hole positions or the siphon drainage device cavity 18 at the farthest end failing to form a siphon. At the same time, it will not cause backflow due to the upper layer pressure being greater than the lower layer pressure. The siphon pipes extending from each hole position on each slope layer are connected in series and then in parallel for each layer, and finally all the water is collected into the end water tank 36, reducing the number of water tanks and saving costs. Placing the water tank 36 at the bottom of the slope can also ensure the smooth outflow of the siphon water flow.

[0065] During the construction of the slope formed in the foundation pit construction process, construction workers will use the anchor rod 4 to support and protect the slope. In this embodiment, the siphon drainage device placement cavity 34 is the hole drilled when installing the anchor rod 4. This anchor hole is used to install the drainage device, avoiding the need to drill holes again.

[0066] Before construction grouting, first inflate the air-inflated expansion plug 11 through the air supply pipe 6. Due to the action of air pressure, the air-inflated expansion plug 11 deforms outward and inward. It expands outward and squeezes the slope hole wall, and deforms inward and squeezes the corrugated free section of the anchor rod 4 to ensure that the grout will not enter the siphon drainage device cavity 18.

[0067] During grouting, the cement grout is ejected from the bottom of the hole through the grouting pipe 2, fills all the pores in the hole from bottom to top, and first squeezes the gas in the hole out of the slope hole through the return grout pipe 3. Finally, the cement grout is also discharged through the return grout pipe 3. Moreover, the cement grout sent into the hole is squeezed into the cracks of the slope soil body under the action of the grouting pressure, and after combining and solidifying with the rock and soil body, a complete anchor solid will be formed. At this time, the cavity of the free section 32 is formed and occupied by the siphon drainage device cavity 18. In the prior art, in order to prevent the corrugated pipe from being corroded and extend its service life, normal-pressure cement grout is injected into the free section cavity.

[0068] In this embodiment, the pressure in the zero-pressure area is the same as the atmospheric pressure, and the pressure in the negative-pressure area is less than the atmospheric pressure.

[0069] Each embodiment in this specification is described in a related manner. For the same and similar parts between each embodiment, reference can be made to each other. Each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and for the related parts, reference can be made to the partial description of the method embodiment.

[0070] The above is only the preferred embodiment of the present invention and is not used to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are all included in the protection scope of the present invention.

Claims

1. A double-siphon outlet triple-negative-pressure enhanced drainage system using anchor holes, characterized in that It includes a siphon drainage device cavity (18), and the siphon drainage device cavity (18) is divided into a zero-pressure zone and a negative-pressure zone; Above the zero-pressure zone, there is a zero-pressure zone and an atmospheric top cover (9). Between the zero-pressure zone and the negative-pressure zone, there is a zero-pressure zone and a negative-pressure zone top cover (10). Between the negative-pressure zone and the grouting section, there is an air-inflated expansion plug (11); The first exhaust pipe (1) passes through the first exhaust pipe hole (23) of the zero-pressure zone and the atmospheric top cover (9) and the zero-pressure zone and the negative-pressure zone top cover (10), and the first exhaust pipe (1) is fixed on the zero-pressure zone and the atmospheric top cover (9) and the zero-pressure zone and the negative-pressure zone top cover (10); The second exhaust pipe (5) passes through the second exhaust pipe hole (27) of the zero-pressure zone and the atmospheric top cover (9), and the second exhaust pipe (5) is fixed on the zero-pressure zone and the atmospheric top cover (9); The air supply pipe (6) sequentially passes through the air supply pipe holes (28) on the zero-pressure zone and the atmospheric top cover (9) and the zero-pressure zone and the negative-pressure zone top cover (10), and the air supply pipe (6) is fixed on the zero-pressure zone and the atmospheric top cover (9) and the zero-pressure zone and the negative-pressure zone top cover (10). The tail end of the air supply pipe (6) is inserted into the hole reserved in the air-inflated expansion plug (11); The first siphon pipe (7) passes through the second siphon pipe hole (30) on the zero-pressure zone and the atmospheric top cover (9), and the first siphon pipe (7) is fixed on the zero-pressure zone and the atmospheric top cover (9). The second siphon pipe (8) passes through the first siphon pipe hole (29) on the zero-pressure zone and the atmospheric top cover (9) and the zero-pressure zone and the negative-pressure zone top cover (10), and the second siphon pipe (8) is fixed on the zero-pressure zone and the atmospheric top cover (9) and the zero-pressure zone and the negative-pressure zone top cover (10); The first siphon pipe (7) is arranged in the zero-pressure zone. U-shaped sections are arranged at the tail ends of the first siphon pipe (7) and the second siphon pipe (8). A front-end control device (22) is arranged at the top of the U-shaped section, and a one-way switch flap (37) is also arranged behind the front-end control device; The front-end control device (22) includes a plastic floating body (19), a hollow large ball (20) and a solid iron ball (21). A vertical channel for the solid iron ball (21) to move is arranged along the diameter direction inside the hollow large ball (20). The plastic floating body (19) and the solid iron ball (21) are connected by a thin line. A perforated baffle (39) is also arranged above the front-end control device (22).

2. The double-siphon outlet triple-negative-pressure enhanced drainage system using an anchor hole according to claim 1, wherein The outer sides of the zero-pressure zone and the negative-pressure zone of the siphon drainage device cavity (18) are respectively wrapped with plastic pipes (16). A capillary drainage belt (13) is wrapped outside the plastic pipes (16). Expansion mud balls (14) are arranged in the gaps of the capillary drainage belt (13). An annular water-blocking device (12) is arranged outside the lower part of the capillary drainage belt (13). A herringbone water guide device (17) and a gate-shaped three-sided water-blocking device (15) are alternately arranged below the capillary drainage belt (13).

3. The dual-siphon outlet triple-negative-pressure enhanced drainage system using anchor holes according to claim 1, characterized in that, The air-inflated expansion plug (11) is divided into three sections. The upper and lower sections are metal sections, and the middle section is a rubber section. The upper and lower metal sections both have holes reserved for the grouting pipe (2) and the slurry return pipe (3). The upper metal section also has a hole reserved for the air supply pipe (6).

4. The dual-siphon outlet triple-negative-pressure enhanced drainage system using an anchor hole according to claim 3, characterized in that, The grouting pipe (2) sequentially passes through the grouting pipe holes (24) of the zero-pressure zone and the atmospheric top cover (9) and the zero-pressure zone and the negative-pressure zone top cover (10), and the holes reserved in the metal part of the aerated expansion plug (11), and the grouting pipe (2) is fixed on the zero-pressure zone and the atmospheric top cover (9), the zero-pressure zone and the negative-pressure zone top cover (10), and the metal part of the aerated expansion plug (11).

5. The dual-siphon outlet triple-negative-pressure enhanced drainage system using an anchor hole according to claim 3, wherein The return grouting pipe (3) sequentially passes through the return grouting pipe holes (25) on the zero-pressure zone and the atmospheric top cover (9) and the zero-pressure zone and the negative-pressure zone top cover (10), and the holes reserved in the metal part of the aerated expansion plug (11), and the return grouting pipe (3) is fixed on the metal part of the aerated expansion plug (11), the zero-pressure zone and the atmospheric top cover (9), and the zero-pressure zone and the negative-pressure zone top cover (10).

6. The dual-siphon outlet triple-negative-pressure enhanced drainage system using an anchor hole according to claim 1, wherein, One end of each of the first exhaust pipe (1) and the second exhaust pipe (5) outside the siphon drainage device cavity (18) is provided with an exhaust valve.

7. An installation cavity of a double-siphon outlet triple-negative-pressure enhanced drainage system using an anchor hole, characterized in that, A double-siphon outlet and triple-negative-pressure enhanced drainage system using an anchor hole is installed in the siphon drainage device installation cavity (34). The first siphon pipe (7) and the second siphon pipe (8) on the same layer are both connected in series. A zero-pressure zone control valve (35-2) and a negative-pressure zone control valve (35-3) are respectively installed at the outlets of the first siphon pipe (7) and the second siphon pipe (8) close to the siphon drainage device installation cavity (34). The layers are connected in parallel, and a main control valve (35-1) is provided for each layer. A water tank (36) is arranged at the end of the connected siphon pipes. A water tank drain pipe (38) is further arranged on the water tank (36); The installation cavity of the double-siphon outlet and triple-negative-pressure enhanced drainage system using an anchor hole is used to install the double-siphon outlet and triple-negative-pressure enhanced drainage system using an anchor hole according to any one of claims 1 to 6.

8. The installation cavity of a dual-siphon outlet triple-negative-pressure enhanced drainage system using an anchor hole according to claim 7, characterized in that, The holes drilled in the slope for installing the anchor rods (4) are used as the siphon drainage device installation cavity (34). The anchor rods (4) pass through the anchor rod holes (26) on the zero-pressure zone and the atmospheric top cover (9) and the zero-pressure zone and the negative-pressure zone top cover (10), and the anchor rods (4) are fixed on the zero-pressure zone and the atmospheric top cover (9) and the zero-pressure zone and the negative-pressure zone top cover (10); The anchor rod (4) includes a free section (32) and an anchorage section (31). The anchorage section (31) is fixed in the slope body, and a collar beam (33) is further arranged on the free section (32).

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