Drainage structure for aeolian sand liquefaction treatment and method of use thereof

Abstract

The application discloses a drainage structure for aeolian sand liquefaction treatment and a use method thereof. The drainage structure comprises multiple drainage pipe groups, a filter box and a water collecting tank with a pressure pump which are sequentially connected. The drainage pipe group comprises two closed drainage pipes at the top and bottom, and the two drainage pipes are connected by a communicating pipe. The sidewall of the communicating pipe is provided with multiple second water inlets. At least two sand blocking mechanisms are installed on the outer wall of the upper half of the drainage pipe. The sidewall of the upper half of the drainage pipe is provided with multiple water inlets. After all components are installed in place, water in the aeolian sand base layer seeps into the drainage pipe through the water inlets. Water in the upper drainage pipe flows into the lower drainage pipe through the communicating pipe. Water seeping into the communicating pipe through the second water inlets flows into the lower drainage pipe through the communicating pipe. After the pressure pump is started, water in all lower drainage pipes enters the filter box and is sent into the water collecting tank. The drainage structure can reduce the moisture in the aeolian sand base layer, avoid the phenomenon that pore water pressure in the aeolian sand base layer gradually expands upward and rises, and ensure the stability of the aeolian sand base layer.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of road subgrade drainage, and relates to a drainage structure for aeolian sand liquefaction treatment. BACKGROUND

[0002] Sand liquefaction refers to the phenomenon that saturated loose powder and fine sand soil suddenly breaks down and becomes liquid under the action of vibration, and the change phenomenon from solid to liquid of the sand soil caused by the rise of pore water pressure and the decrease of effective stress. The mechanism is that the saturated loose powder and fine sand soil body has the tendency of particle movement and density under the action of vibration, and the stress bearing is transferred from the sand skeleton to water. Due to the poor permeability of powder and fine sand soil, the pore water pressure will increase sharply, and when the pore water pressure reaches the total stress value, the effective stress will be reduced to zero, and the particles will be suspended in water, and the sand soil body will be liquefied.

[0003] Many roads in remote areas are constructed in aeolian sand environment, and underground water pore water liquefaction phenomenon will occur at the bottom of part of the sand body. When the pore water pressure at the bottom of the sand soil reaches or exceeds the weight of the overlying sand layer and water, the sand soil will lose the frictional resistance between the particles and float up, so that the bottom of the sand layer gradually floats and becomes unstable, and then the internal bearing capacity of the whole sand layer is reduced, so that the road constructed on the top of the sand layer cannot be supported, and in severe cases, the road will collapse and be damaged, and cannot be used. SUMMARY

[0004] The purpose of the application is to provide an aeolian sand liquefaction treatment drainage structure for collecting and discharging the water mixed at the bottom of the sand layer.

[0005] Another purpose of the application is to provide a use method for collecting and discharging the water mixed at the bottom of the sand layer by using the above drainage structure.

[0006] To achieve the above purpose, the technical scheme adopted by the application is: an aeolian sand liquefaction treatment drainage structure, characterized by comprising a filter box and a plurality of drainage pipe groups, the filter box is connected with a water collecting tank through a connecting conduit, a pressure pump is arranged in the water collecting tank, the plurality of drainage pipe groups are arranged side by side in sequence in the direction away from the filter box, each drainage pipe group comprises two drainage pipes arranged in parallel, and the two drainage pipes in the same drainage pipe group are connected through a communication pipe; the drainage pipe located at the lower side in the drainage pipe group adjacent to the filter box is connected with the water inlet of the filter box through a drainage pipe, the drainage pipes located at the lower side in the adjacent two drainage pipe groups are connected through a flow guide pipe, and the drainage pipe and the flow guide pipe are both arranged in an inclined manner; a plurality of second water inlets are arranged on the side wall of the communication pipe.

[0007] The drainage pipe is closed at both ends, and a plurality of water inlet hole groups are arranged on the side wall of the upper half of the drainage pipe, each water inlet hole group is composed of a plurality of first water inlet holes arranged along the axis direction of the drainage pipe, a water inlet pipe is arranged in the first water inlet hole, and a first filter screen is arranged in the water inlet pipe.

[0008] Another technical scheme adopted by the present application is a use method of the drainage structure for the aeolian sand liquefaction treatment, in particular to:

[0009] 1) install the water collecting tank on the ground, bury the filter tank, the drainage pipe, all drainage pipe groups and all flow guide pipes in the aeolian sand base, and connect the water collecting tank and the filter tank through the connecting pipe;

[0010] 2) the doped water in the aeolian sand base penetrates into the drainage pipe through the water inlet pipe, the doped water in the upper drainage pipe of the drainage pipe group flows into the lower drainage pipe of the drainage pipe group through the communication pipe, and the doped water in the communication pipe also flows into the lower drainage pipe through the second water inlet hole in the communication pipe;

[0011] 3) when the doped water in the lower drainage pipe of the drainage pipe group is collected for a period of time, the pressure pump is started, the pressure pump is operated, the suction force is generated in the connecting pipe, under the action of the suction force, the doped water in all the lower drainage pipes moves to the direction of the filter tank through the flow guide pipe connected with the drainage pipe, and finally enters the filter tank through the flow guide pipe;

[0012] 4) the doped water in the filter tank is filtered, enters the connecting pipe, and flows into the water storage tank in the water collecting tank through the connecting pipe.

[0013] The drainage structure has the following advantages:

[0014] 1. When the underground water doped phenomenon occurs in the aeolian sand base, the underground water penetrates into the bottom pipe of the water inlet pipe and is transported out of the aeolian sand base, so as to reduce the water contained in the doped aeolian sand base, avoid the pore water pressure phenomenon in the aeolian sand base, prevent the aeolian sand base from gradually swelling and rising, ensure the stability of the base in the aeolian sand base, improve the support stability of the base in the aeolian sand base, and avoid the collapse and damage of the pavement.

[0015] 2. The cover is an oval hollow structure, when the underground water and pore water are generated in the aeolian sand base, the sand layer in the aeolian sand base will swell to a certain extent, the multiple covers can block and cover the swelling sand layer, avoid the local gradual rising of the sand layer, and improve the stability and compactness of the base in the aeolian sand base.

[0016] 3. The bottom pipe is wrapped with temperature insulation layer, protective layer and wear-resistant layer in sequence, the temperature insulation layer is made of aluminum silicate heat preservation material and has certain high temperature resistance effect, the protective layer is made of rubber plastic material and has certain buffering protection effect, and the wear-resistant layer is made of aluminum oxide ceramic material and has certain wear resistance effect, so that the service life of the bottom pipe can be prolonged.

[0017] 4. The bottom pipe collects water in the wind-sand base layer and flows and discharges the collected water, at this time, the water collected by the multiple bottom pipes is guided into the filter box under the guidance of the flow guide pipe and is filtered layer by layer, and after the water in the filter box is recycled into the water collecting tank, disinfection and storage are performed. When a pedestrian needs to use water, the baffle can be opened, water is discharged and used through the water faucet, the water doped in the wind-sand base layer is recycled, and emergency water supply use is facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a schematic view of the water drainage structure of the present application.

[0019] Figure 2 is Figure 1 the enlarged view of A in FIG. 1.

[0020] Figure 3 is Figure 1 the enlarged view of B in FIG. 1.

[0021] Figure 4 is Figure 1 the enlarged view of C in FIG. 1.

[0022] Figure 5 is Figure 1 the enlarged view of D in FIG. 1.

[0023] In the figure: 1. wind-sand base layer, 2. paving, 3. water collecting tank, 4. photovoltaic panel, 5. connecting guide pipe, 6. filter box, 7. flow guide pipe, 8. cover, 9. connecting rod, 10. drainage pipe, 11. communication pipe, 12. flow guide pipe, 13. bottom pipe, 14. temperature insulation layer, 15. protective layer, 16. wear-resistant layer, 17. first filter screen, 18. water inlet pipe, 19. first water inlet hole, 20. liquid guide cover, 21. second filter screen, 22. second water inlet hole, 23. first installation filter screen, 24. first recovery filter screen, 25. second recovery filter screen, 26. filter cloth belt, 27. second installation filter screen, 28. water receiving bin, 29. water faucet, 30. baffle. DETAILED DESCRIPTION

[0024] The present application will be described in detail below in combination with the drawings and specific embodiments.

[0025] As Figure 1As shown, the drainage structure of this invention includes a filter box 6 and multiple drainage pipe groups connected in sequence. The outlet of the filter box 6 is connected to a water collection tank 3 via a connecting conduit 5. A photovoltaic panel 4 is installed on the top of the water collection tank 3. The multiple drainage pipe groups are arranged side by side in sequence along the direction away from the filter box 6, starting with the drainage pipe group adjacent to the filter box 6. The height of the drainage pipe group located at odd-numbered positions is lower than that of the drainage pipe group located at even-numbered positions, and all drainage pipe groups located at odd-numbered positions have the same height, while all drainage pipe groups located at even-numbered positions have the same height. The drainage pipe groups include upper and lower... Two parallel drain pipes 10 are connected by a connecting pipe 11 within the same drain pipe group. In the drain pipe group adjacent to the filter box 6, the lower drain pipe 10 is connected to the inlet of the filter box 6 via a diversion pipe 7. The connection position of the diversion pipe 7 to the filter box 6 is lower than the connection position of the diversion pipe 7 to the drain pipe 10. The lower drain pipe 10 in two adjacent drain pipe groups is connected by a guide pipe 12. The connection position of the guide pipe 12 to the drain pipe 10 in the even-numbered drain pipe group is higher than the connection position of the guide pipe 12 to the drain pipe 10 in the odd-numbered drain pipe group.

[0026] Two rows of sand-blocking mechanisms are symmetrically installed on the outer wall of the upper half of the lower drain pipe 10 in the drainage pipe assembly, and at least two rows of sand-blocking mechanisms are evenly distributed on the outer wall of the upper half of the upper drain pipe 10 in the drainage pipe assembly. The sand-blocking mechanism includes a connecting rod 9, one end of which is fixedly connected to the drain pipe 10. The other end of the connecting rod 9 at the top of the upper drain pipe 10 in the drainage pipe assembly faces upward, and the other ends of the remaining connecting rods 9 in the drainage pipe assembly are inclined upward. Along the axial direction of the connecting rod 9, multiple semi-elliptical cylindrical baffles 8 are installed on the connecting rod 9. The larger diameter end of the baffle 8 faces the drain pipe 10, and the diameter of the baffle 8 installed on the connecting rod 9 gradually increases along the direction away from the drain pipe 10.

[0027] like Figure 2 The drain pipe 10 includes a bottom pipe 13. Along the direction away from the bottom pipe 13, an insulation layer 14, a protective layer 15, and a wear-resistant layer 16 are sequentially wrapped around the outer wall of the bottom pipe 13. The insulation layer 14, protective layer 15, and wear-resistant layer 16 constitute an outer protective layer. The upper half of this outer protective layer has multiple rows of water inlet hole groups. Each water inlet hole group consists of multiple first water inlet holes 19 arranged along the axis of the bottom pipe 13. A water inlet pipe 18 is installed inside each first water inlet hole 19. The water inlet pipe 18 penetrates the outer protective layer and one side wall of the bottom pipe 13, communicating with the inner hole of the bottom pipe 13. Two layers of first filter screens 17 are provided inside the water inlet pipe 18. One end of the connecting rod 9 is fixedly connected to the outer protective layer. The port of the guide pipe 12 passes through the outer protective layer of the lower drain pipe 10 in the drain pipe group and communicates with the inner hole of the bottom pipe 13; the port of the drain pipe 7 passes through the outer protective layer of the lower drain pipe 10 in the drain pipe group adjacent to the filter box 6 and communicates with the inner hole of the bottom pipe 13. Both ends of the bottom pipe 13 are closed.

[0028] The temperature insulation layer 14 is made of aluminum silicate heat preservation material and has certain high temperature resistance effect; the protective layer 15 is made of rubber plastic material and has a buffering protection effect; and the wear-resistant layer 16 is made of aluminum oxide ceramic material and has certain wear resistance.

[0029] The communication pipe 11 comprises a tubular communication pipe body, such as Figure 3 The pipe wall of the communication pipe body is provided with a plurality of second water inlet holes 22, and each second water inlet hole 22 is provided with a second filter screen 21; and the inner wall of the communication pipe body is fixedly connected with at least three liquid guide covers 20, the liquid guide cover 20 is a hollow half-elliptical cylinder, and the larger diameter end of the liquid guide cover 20 is upward. The inner holes of the bottom pipes 13 in the upper and lower drain pipes 10 in the same drain pipe group are communicated through the communication pipe 11.

[0030] The filter box 6 comprises a hollow box body, two opposite side walls of the four side walls of the box body form a group of side walls, and the two opposite side walls of the group of side walls are respectively provided with a water inlet and a water outlet, the water inlet is connected with the other end of the drainage pipe 7, and the water outlet is connected with one end of the connecting pipe 5; along the direction from the water inlet to the water outlet, the box body is sequentially provided with a first installed filter screen 23, a second installed filter screen 27 and a filter cloth belt 26, as shown in Figure 4 The first installed filter screen 23 is provided with a first recovery filter screen 24, the second installed filter screen 27 is provided with a second recovery filter screen 25, and the mesh diameter of the second recovery filter screen 25 is smaller than that of the first recovery filter screen 24.

[0031] The water collecting tank 3 comprises a hollow water collecting tank shell, and the water collecting tank shell is provided with a water storage tank and a pressure pump; the water collecting tank shell is provided with a photovoltaic panel 4 on the top, and the photovoltaic panel 4 is electrically connected with the pressure pump; the water storage tank is connected with the other end of the connecting pipe 5; the water collecting tank shell is provided with a recessed water receiving bin 28, the water receiving bin 28 is provided with a water faucet 29 connected with the water storage tank, and the bin opening of the water receiving bin 28 is hingedly connected with a liftable baffle 30, as shown in Figure 5 .

[0032] The application also provides a use method of the above-mentioned drainage structure for collecting and discharging the doped water at the bottom of the sand layer, which is specifically performed according to the following steps:

[0033] 1) The water collecting tank 3 in the drainage structure is installed on the ground, the filter box 6, the drainage pipe 7, all the drain pipe groups and all the flow guide pipes 12 are buried in the aeolian sand base 1, the water collecting tank 3 and the filter box 6 are connected through the connecting pipe 5, and the aeolian sand base 1 is paved with the pavement 2.

[0034] 2) The doped water in the wind-sand base layer 1 penetrates into the bottom pipe 13 through the water inlet pipe 18, the doped water in the bottom pipe 13 of the upper drainage pipe 10 in the drainage pipe group penetrates into the bottom pipe 13 of the lower drainage pipe 10 in the drainage pipe group through the communication pipe 11, and the doped water in the wind-sand base layer 1 in the communication pipe 11 through the second water inlet hole 22 on the communication pipe 11 also flows into the bottom pipe 13 of the lower drainage pipe 10 through the communication pipe 11.

[0035] The photovoltaic panel 4 generates electric energy under the irradiation of sunlight to provide electric energy for the pressure pump in the water collecting tank 3.

[0036] 3) When the lower drainage pipe 10 in the drainage pipe group collects doped water for a period of time, the pressure pump is started, the pressure pump operates, and the suction force is generated in the connecting conduit 5, under the action of the suction force, all the doped water in the lower drainage pipe 10 moves to the direction of the filtering tank 6 through the flow guide pipe 12 connected with the drainage pipe 10, and finally enters the filtering tank 6 through the drainage pipe 7.

[0037] 4) The doped water entering the filtering tank 6 is filtered in sequence through the first recovery filter screen 24, the second recovery filter screen 25 and the filtering cloth belt 26, and then enters the connecting conduit 5 and flows into the water storage tank in the water collecting tank 3 through the connecting conduit 5, and the water in the water storage tank is subjected to disinfection treatment.

[0038] The water stored in the water collecting tank 3 is supplied to the emergency use.

[0039] The filtering cloth belt 26 is used for re-filtering the water filtered by the two installed filter screens.

[0040] The drainage structure can collect and discharge the pore water in the wind-sand base layer 1. When the underground water doped phenomenon occurs at the bottom base layer position in the wind-sand base layer 1, the doped water is infiltrated into the bottom pipe 13 through the plurality of water inlet pipes 18 and is transported and discharged, the doped water contained in the wind-sand base layer 1 is reduced, the pore water hydraulic pressure phenomenon in the wind-sand base layer 1 is avoided to gradually expand upward and rise, the stability of the self-base layer in the wind-sand base layer 1 is ensured, the stability of the self-support of the wind-sand base layer 1 to the paved road surface 2 is improved, and the collapse and damage of the paved road surface 2 is avoided.

[0041] When the pore water phenomenon occurs in the wind-sand base layer 1, the water source pressure makes the sand particles in the wind-sand base layer 1 expand upward, the plurality of cover plates 8 in the drainage structure can block the sand particles wrapped and expanded upward, avoid the local gradual rise of the sand layer, reduce the liquefaction phenomenon, and improve the bottom bearing stability and compactness of the wind-sand base layer 1.

[0042] The temperature insulation layer 14, the protection layer 15 and the wear-resistant layer 16 can prolong the service life of the bottom pipe 13.

[0043] When the pedestrian passes through the water collecting tank 3, the baffle 30 can be opened, and the water in the water storage tank is discharged through the faucet 29 for use; at the same time, the water stored in the water collecting tank 3 can be used as emergency water supply, so that the water doped in the aeolian sandy base 1 is recycled.

Claims

1. A drainage structure for liquefaction treatment of aeolian sand, characterized by, The device comprises a filter tank (6) and a plurality of drainage pipe groups, the filter tank (6) is connected with the water collecting tank (3) through a connecting conduit (5), the water collecting tank (3) is provided with a pressure pump, the plurality of drainage pipe groups are arranged in sequence and side by side in a direction away from the filter tank (6), the drainage pipe group comprises two drainage pipes (10) arranged in parallel, the two drainage pipes (10) in the same drainage pipe group are connected through a communicating pipe (11), the drainage pipe (10) located at the lower side of the drainage pipe group adjacent to the filter tank (6) is connected with the water inlet of the filter tank (6) through a drainage pipe (7), the drainage pipes (10) located at the lower side of the adjacent two drainage pipe groups are connected through a flow guide pipe (12), the drainage pipe (7) and the flow guide pipe (12) are arranged in an inclined manner, and a plurality of second water inlets (22) are arranged on the side wall of the communicating pipe (11). The two ends of the drainage pipe (10) are closed, a plurality of water inlet groups are arranged on the upper half of the side wall of the drainage pipe (10), each water inlet group is composed of a plurality of first water inlets (19) arranged in the axial direction of the drainage pipe (10), a water inlet pipe (18) is arranged in the first water inlet (19), and a first filter screen (17) is arranged in the water inlet pipe (18). Two rows of sand resistance mechanisms are symmetrically arranged on the outer wall of the upper half of the drainage pipe (10) located at the lower side of the drainage pipe group, and at least two rows of sand resistance mechanisms are uniformly arranged on the outer wall of the upper half of the drainage pipe (10) located at the upper side of the drainage pipe group; the sand resistance mechanism comprises a connecting rod (9), one end of the connecting rod (9) is fixedly connected with the drainage pipe (10), the other end of the connecting rod (9) at the top of the drainage pipe (10) located at the upper side of the drainage pipe group is upward, the other end of the connecting rod (9) of the remaining drainage pipes (10) is inclined upward, a plurality of half-elliptical cylindrical baffle covers (8) are arranged on the connecting rod (9) in the axial direction of the connecting rod (9), the baffle cover (8) has a larger diameter end facing the drainage pipe (10), and the diameter of the baffle cover (8) arranged on the connecting rod (9) gradually increases in a direction away from the drainage pipe (10). The drainage pipe (10) comprises a bottom pipe (13) with closed two ends, a temperature insulation layer (14), a protection layer (15) and a wear-resistant layer (16) are sequentially wrapped on the outer wall of the bottom pipe (13) in a direction away from the bottom pipe (13), the temperature insulation layer (14), the protection layer (15) and the wear-resistant layer (16) form an outer protective layer, a plurality of water inlet groups are arranged on the upper half of the outer protective layer, each water inlet group is composed of a plurality of first water inlets (19) arranged in the axial direction of the bottom pipe (13), a water inlet pipe (18) is arranged in the first water inlet (19), the water inlet pipe (18) penetrates the single-side side wall of the outer protective layer and the bottom pipe (13) and communicates with the inner hole of the bottom pipe (13), and two layers of first filter screens (17) are arranged in the water inlet pipe (18). The communicating pipe (11) comprises a tubular communicating pipe body, a plurality of second water inlets (22) are arranged on the pipe wall of the communicating pipe body, a second filter screen (21) is arranged in each second water inlet (22), and at least three liquid guide covers (20) are fixedly connected to the inner wall of the communicating pipe body, the liquid guide cover (20) is a half-elliptical inverted cylinder.

2. The drainage structure for wind-blown sand liquefaction treatment according to claim 1, wherein The height position of the drainage pipe group located at the odd number position is lower than the height position of the drainage pipe group located at the even number position, and the height positions of all the drainage pipe groups located at the odd number position are the same, and the height positions of all the drainage pipe groups located at the even number position are the same.

3. The drainage structure for wind-blown sand liquefaction treatment according to claim 1, wherein The filter box (6) comprises a hollow box body, two opposite side walls of the four side walls of the box body form a group, the two opposite side walls of the group are respectively provided with a water inlet and a water outlet, the water inlet is connected with the other end of the drainage pipe (7), the water outlet is connected with one end of the connecting pipe (5), along the direction from the water inlet to the water outlet, the box body is sequentially provided with a first installed filter screen (23), a second installed filter screen (27) and a filter cloth belt (26), the first installed filter screen (23) is provided with a first recovery filter screen (24), the second installed filter screen (27) is provided with a second recovery filter screen (25), the diameter of the mesh in the second recovery filter screen (25) is smaller than the diameter of the mesh in the first recovery filter screen (24).

4. The drainage structure for wind-blown sand liquefaction treatment according to claim 1, wherein The water collecting tank (3) comprises a hollow water collecting tank shell, a water storage tank and a pressure pump are arranged in the water collecting tank shell, the water storage tank is connected with the other end of the connecting pipe (5); the water collecting tank shell is provided with a recessed water receiving bin (28), a water faucet (29) in communication with the water storage tank is arranged in the water receiving bin (28).

5. The drainage structure for wind-blown sand liquefaction treatment according to claim 4, wherein The water collecting tank (3) is provided with a photovoltaic panel (4) on the top, and the photovoltaic panel (4) is electrically connected with the pressure pump.

6. A method of using the drainage structure for the aeolian sand liquefaction treatment according to claim 1, characterized by, The use method is specifically: 1) install the water collecting tank (3) on the ground, bury the filter box (6), the drainage pipe (7), all the drainage pipe groups and all the flow guide pipes (12) in the wind-sand base layer (1), and connect the water collecting tank (3) and the filter box (6) through the connecting pipe (5); 2) the doped water in the wind-sand base layer (1) penetrates into the drainage pipe (10) through the water inlet pipe (18), the doped water in the upper drainage pipe (10) in the drainage pipe group flows into the lower drainage pipe (10) in the drainage pipe group through the communication pipe (11), and the doped water in the communication pipe (11) through the second water inlet hole (22) also flows into the lower drainage pipe (10) through the communication pipe (11); 3) after the doped water in the lower drainage pipe (10) in the drainage pipe group is collected for a period of time, the pressure pump is started, the pressure pump operates, and suction is generated in the connecting pipe (5), under the action of the suction, the doped water in all the lower drainage pipes (10) moves towards the filter box (6) through the flow guide pipe (12) connected with the drainage pipe (10), and finally enters the filter box (6) through the drainage pipe (7); 4) the doped water in the filter box (6) is filtered, enters the connecting pipe (5), and flows into the water storage tank in the water collecting tank (3) through the connecting pipe (5).

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