A road administration anti-clogging drainage structure and drainage method

Abstract

A drainage structure and method for preventing siltation for road administration, including a drainage unit and a flushing unit; the drainage unit includes an inlet pipe and a tee pipe connected to the inlet pipe; the two ends of the tee pipe away from the inlet pipe are provided with a flushing sleeve and a drain pipe; a section of the inlet pipe placed in the road cut slope is provided with a plurality of permeable holes; the flushing unit includes a flushing pipe; the tee pipe can discharge groundwater into the side ditch below the road cut slope through the drain pipe after entering the inlet pipe through the permeable holes; or, during the flushing operation, water can be injected into the inlet pipe through the flushing sleeve through the flushing pipe to increase the air pressure in the inlet pipe, so that the silt water is discharged from the drain pipe to the side ditch under pressure. The present invention can not only use the flushing device to flush and dredge the inlet pipe, but also use pressurized water to reversely flush the permeable geotextile wrapped around the inlet pipe, restore the water permeability of the permeable geotextile, and improve the drainage effect of the drainage device.

Description

Technical Field

[0001] The invention relates to the technical fields of road cutting slope protection, slope drainage, landslide treatment and the like, and in particular to an anti-clogging drainage structure and a drainage method for road administration. Background Art

[0002] With the rapid development of my country's transportation system, the mileage of highway and railway construction has increased significantly. Deep road cutting excavation under complex geological conditions is becoming more and more common in highway and railway subgrade projects. The excavation depth has also increased significantly with the advancement of construction technology. This makes the impact of groundwater on the subgrade and road slope during road cutting excavation and road operation an inevitable problem. At present, the measures used to reduce and remove groundwater in road cutting construction mainly include seepage culverts, support seepage ditches, and inclined drainage holes. The inclined drainage hole uses a small-diameter drilled hole in the slope to insert a perforated PVC drainage pipe to remove groundwater from the slope. It is a very effective way to strengthen the deep drainage inside the slope. It can quickly drain the deep groundwater in the slope and fill the shear strength of the slope soil. However, as the use time of the inclined drainage hole increases, the disadvantage of easy clogging will be revealed, especially the inclined drainage pipe in the weathered soft rock and soil formation is more likely to be blocked by small particles of rock and soil, which seriously affects its use function and even threatens the stability of the road cutting slope. Summary of the invention

[0003] The present invention provides a drainage structure and a drainage method for road administration, which mainly solve the technical problems that the currently used upward inclined drainage holes have poor durability and are easy to be clogged, thereby facilitating the maintenance of road cutting drainage facilities during the road operation stage and improving the stability of the road cutting slopes with deep underground water.

[0004] In order to solve at least one of the above technical problems, the technical solution adopted by the present invention is:

[0005] A road administration anti-clogging drainage structure comprises a drainage unit and a flushing unit;

[0006] The drainage unit includes a water inlet pipe partially placed in the pipeline of the road cutting slope and a tee pipe connected to the water inlet pipe and placed at the end of the water inlet pipe located on the outer side of the road cutting slope;

[0007] At two ends of the tee pipe away from the water inlet pipe, one is provided with a flushing sleeve and the other is provided with a drain pipe;

[0008] The water inlet pipe is placed in the road cutting slope and has a plurality of water permeable holes along the periphery of its wall surface;

[0009] The flushing unit includes a flushing pipe partially inserted into the water inlet pipe;

[0010] The three-way pipe can discharge groundwater into the side ditch below the cutting slope through the drainage pipe after the groundwater enters the water inlet pipe through the water permeable hole; or,

[0011] The three-way pipe can be used to inject water into the water inlet pipe through the flushing pipe via the flushing sleeve during flushing operations to increase the air pressure in the water inlet pipe, and then the silt water is pressurized and discharged from the drain pipe into the side ditch.

[0012] Furthermore, the water inlet pipe is inclined upward by 6-10 degrees along the horizontal ground direction; the length of the water inlet pipe placed inside the road cutting slope is greater than the length of the water inlet pipe placed outside the road cutting slope.

[0013] Furthermore, the drain pipe is located below the flushing sleeve; and the length of the drain pipe extends to just above the location of the side ditch.

[0014] Furthermore, a detachable plug is provided at one end of the flushing sleeve and the drain pipe away from the tee pipe.

[0015] Furthermore, the length of the flushing pipe is greater than the length of the water inlet pipe.

[0016] Furthermore, the diameter of the flushing tube is smaller than the diameter of the flushing sleeve.

[0017] Furthermore, a rubber water stopper is provided between the flushing pipe and the flushing sleeve.

[0018] Furthermore, a layer of permeable geotextile is provided on the periphery of the outer wall of the water inlet pipe. The geotextile is arranged to wrap the water inlet pipe, and its length at least covers a section of the water inlet pipe having the permeable holes.

[0019] Furthermore, the diameters of the water inlet pipe and the drain pipe are both 100 mm.

[0020] A method for preventing siltation and drainage for road administration, using the drainage structure as described in any one of the above, comprising the following steps:

[0021] S1, when draining;

[0022] S11, first blocking the outlet of the flushing sleeve and opening the outlet of the drain pipe;

[0023] S12, the groundwater enters the water inlet pipe through the water permeable hole and then flows into the side ditch through the drainage pipe;

[0024] S2, when flushing;

[0025] S21, first blocking the outlet of the drain pipe;

[0026] S22, open the outlet of the flushing sleeve; make the flushing pipe pass through the flushing sleeve, the tee pipe and the water inlet pipe in sequence, and make the distance from the top of the flushing pipe to the top of the water inlet pipe no more than 0.5m;

[0027] S23, setting a rubber water stopper at the gap between the flushing pipe and the flushing sleeve to seal it, and connecting the flushing pipe to an external water supply source;

[0028] S24, inject water into the water inlet pipe at a water injection pressure of 0.4 MPa, and maintain the pressure for 2 minutes;

[0029] S25, remove the plug at the end of the drain pipe and start flushing with water for 3 minutes;

[0030] S26, repeat S21-25 until the water discharged from the drain pipe is clear water.

[0031] The invention adopts a drainage structure and a drainage method for preventing siltation for road administration. The structure can not only use a flushing device to flush and dredge the water inlet pipe, but also use pressurized water to reversely flush the permeable geotextile wrapped around the water inlet pipe, thereby restoring the water permeability of the permeable geotextile and improving the drainage effect of the drainage device. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of a road administration anti-clogging drainage structure according to an embodiment of the present invention;

[0033] Figure 2 is a schematic structural diagram of a drainage unit according to an embodiment of the present invention;

[0034] Figure 3 This is a schematic diagram of the structure of the geotextile and the water inlet pipe in one embodiment of the present invention;

[0035] Figure 4 is a schematic structural diagram of a flushing unit according to an embodiment of the present invention;

[0036] Figure 5 It is a schematic structural diagram of the cooperation between the flushing unit and the drainage unit according to one embodiment of the present invention.

[0037] In the figure:

[0038] 10. Drainage unit 11. Water inlet pipe 12. Tee pipe

[0039] 13. Flushing casing 14. Drain pipe 15. Plug

[0040] 16. Water permeable hole 17. Geotextile 20. Flushing unit

[0041] 21. Flushing pipe 22. Water stopper 23. Water pipe

[0042] 30, road cutting slope 40, ditch 50, road DETAILED DESCRIPTION

[0043] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0044] This embodiment provides a road administration anti-clogging drainage structure, such as Figure 1-2 As shown, it includes a drainage unit 10 and a flushing unit 20; wherein the drainage unit 10 includes an inlet pipe 11 partially placed in a pipe in the road cutting slope 30 and a tee pipe 12 connected to the inlet pipe 11 and placed at the end of the inlet pipe 11 outside the road cutting slope 30; at the two ends of the tee pipe 12 away from the inlet pipe 11, one is provided with a flushing sleeve 13, and the other is provided with a drain pipe 14; a section of the inlet pipe 11 set in the road cutting slope 30 is provided with a plurality of water permeable holes 16 along the periphery of its wall, and the other sections are solid surfaces, and the flushing sleeve 13 and the drain pipe 14 are both connected to the tee pipe 12. Figure 4-5 As shown, the flushing unit 20 includes a flushing pipe 21 partially inserted into the water inlet pipe 11 .

[0045] During normal drainage, the tee pipe 12 can carry the groundwater deposited in the road cutting slope 30 into the water inlet pipe 11 through the water permeable hole 16 for convergence, and then enter the tee pipe 12 along the water inlet pipe 11, and then avoid the blocked flushing sleeve 13 and be discharged from the opened drain pipe 14 to the side ditch 40 located below the road cutting slope 30.

[0046] Alternatively, when flushing the sludge collected in the water inlet pipe 11, the tee pipe 12 can inject water into the water inlet pipe 11 through the flushing pipe 21, the flushing sleeve 13 and the tee pipe 12 when the drain pipe 14 is first blocked, so as to increase the air pressure in the water inlet pipe 11. After removing the plug 15 at the end of the drain pipe 14, the pressurized sludge water flows along the water inlet pipe 11 through the tee pipe 12 and then is discharged from the drain pipe 14 to the side ditch 40.

[0047] Specifically, Figure 1As shown, the road cut slope 30 is arranged on both sides of the road 50, and the side ditch 40 is arranged on both sides of the road 50 in the width direction, and the side ditch 40 is located at a position obliquely below the road cut slope 30. When the water inlet pipe 11 is arranged, a hole can be drilled in the road cut slope 30 in advance, and then the water inlet pipe 11 is inserted into the drilled hole. A plurality of drainage units 10 arranged side by side can be arranged on the road cut slope 30, and accordingly, only one group of flushing units 20 is arranged. The structure of all drainage units 10 is the same, that is, the water inlet pipe 11 is arranged as a guide flow pipe on one side of the road cut slope 30 along the horizontal ground direction at an angle θ of 6-10°, so as to facilitate the drainage of groundwater into the side ditch 40. If the inclination angle θ of the water inlet pipe 11 is less than 6°, the water inlet pipe 11 is almost level with the ground plane and cannot play a diversion role; if the inclination angle θ of the water inlet pipe 11 is greater than 10°, the diversion effect of groundwater converging into the water inlet pipe 11 will be weakened. The length of the water inlet pipe 11 placed inside the cutting slope 30 is greater than its length placed outside the cutting slope 30, which not only facilitates the collection of more groundwater so that more groundwater can be discharged from the water inlet pipe 11, avoiding the risk of excessive groundwater in the cutting slope 30 causing the cutting slope 30 to become unstable; it can also increase the fixing strength of the water inlet pipe 11 to improve the stability of the placement of the drainage unit 10.

[0048] The water inlet pipe 11 is a PVC pipe with a diameter of 100 mm, which can withstand a pressure of not less than 0.5 MPa. The diameter of the water permeable hole 16 in the upper section is 10 mm. Since the water inlet hole 16 is easily blocked by silt, a layer of permeable geotextile 17 is required to be provided on the outer wall of the water inlet pipe 11. The cross section of the geotextile is as follows: Figure 3 The geotextile 17 wraps the water inlet pipe 11 to prevent excessive silt from blocking the water permeable holes 16, and the length of the geotextile 17 wrapping the water inlet pipe 11 at least covers a section of the water inlet pipe 11 where the water permeable holes 16 are located.

[0049] like Figure 2 As shown, the tee pipe 12 is a commonly used Y-shaped tee, and its three ends are respectively connected to the water inlet pipe 11, the flushing pipe sleeve 13 and the drain pipe 14. The drain pipe 14 is also a PVC pipe with a diameter of 100 mm. The drain pipe 14 is located below the flushing sleeve 13; and the length of the drain pipe 14 extends to the position just above the side ditch 40, so that the water discharged from the drain pipe 14 can be completely guided to the side ditch 40 for discharge.

[0050] In actual operation, it is also necessary to provide a detachable plug 15 at one end of the flushing sleeve 13 and the drain pipe 14 away from the tee pipe 12 .

[0051] Conventionally, the outlet of the flushing sleeve 13 is first blocked with a plug 15, and only the outlet of the drain pipe 14 is opened; the groundwater deposited in the road cut slope 30 is first filtered by the geotextile 17, and the silt is screened out of the water inlet pipe 11 by the geotextile 17, and the muddy water then enters the water inlet pipe 11 through the permeable holes 16 and converges, and then enters the tee pipe 12 along the length of the water inlet pipe 11, and then is discharged from the outlet of the opened drain pipe 14 and flows into the side ditch 40.

[0052] like Figure 4 As shown, the flushing pipe 21 is a DN20 steel pipe that can be extended. When it is inserted into the water inlet pipe 11, it is prevented from being blocked and deformed by silt, and its strength is improved. The length of the flushing pipe 21 is greater than the length of the water inlet pipe 11, and its diameter is smaller than the diameter of the flushing sleeve 13, in order to facilitate the operation of the flushing pipe 21 and facilitate its entry and exit from the water inlet pipe 11. A rubber water stopper 22 is also provided between the flushing pipe 21 and the flushing sleeve 13, which is used to block the gap between the flushing pipe 21 and the flushing sleeve 13, in order to prevent water from flowing back from the flushing sleeve 13 when water is injected into the water inlet pipe 11. The flushing pipe 21 is connected to an external water supply source through a water pipe 23.

[0053] During flushing, the outlet of the drain pipe 14 is first blocked with the plug 15, and then the flushing pipe 21 is inserted into the water inlet pipe 11 after passing through the flushing sleeve 13 and the tee pipe 12, and the head of the flushing pipe 21 is placed within a range of 0.5m from the top of the water inlet pipe 11. The purpose is to quickly and accurately inject more water into the water inlet pipe 11, so that the water flow can completely flush down from the top of the water inlet pipe 11 immediately, and maximize the length of the silt accumulated in the water inlet pipe 11; at the same time, the water entering the water inlet pipe 11 can also reversely flush the silt on the geotextile 17. The outer end of the flushing pipe 21 uses a rubber water stopper 21 to close the gap between the flushing sleeve 13 and the flushing pipe 21. After the sealing is completed, the water pipe 23 is connected to the external water supply source to inject water into the water inlet pipe 11 through the flushing pipe 21. The water injection pressure is 0.4MPa, and the pressure is maintained for 2min. Then remove the plug 15 at the end of the drain pipe 14, and start flushing with water. The flushing time is 3min. After flushing, repeat the operation, first perform the pressure maintenance water injection operation for 2 minutes, then perform the water discharge and flushing operation for 3 minutes, and repeat this process until the water discharged from the drain pipe 14 becomes clear, and the entire cleaning process is considered to be completed.

[0054] A road administration anti-clogging drainage method, using the drainage structure as described above, comprises the following steps:

[0055] S1. When draining.

[0056] S11, first block the outlet of the flushing sleeve 13, and open the outlet of the drain pipe 14.

[0057] S12, groundwater enters the water inlet pipe 11 through the water permeable hole 16 and then flows into the side ditch 40 through the drain pipe 14.

[0058] S2. When flushing.

[0059] S21, first block the outlet of the drain pipe 14.

[0060] S22, open the outlet of the flushing sleeve 13; make the flushing pipe 11 pass through the flushing sleeve 13, the tee pipe 12 and the water inlet pipe 11 in sequence, and make the distance from the top of the flushing pipe 21 to the top of the water inlet pipe 11 not more than 0.5m.

[0061] S23, a rubber water stopper 22 is then provided at the gap between the flushing pipe 21 and the flushing sleeve 13 to seal it, and the flushing pipe 21 is connected to an external water supply source.

[0062] S24, inject water into the water inlet pipe 21, the water injection pressure is 0.4MPa, and the pressure is maintained for 2min.

[0063] S25, remove the plug at the end of the drain pipe 14, start flushing with water, and the flushing time is 3 minutes.

[0064] S26, repeat S21-25 until the water discharged from the drain pipe 14 is clear water.

[0065] The invention adopts a drainage structure and a drainage method for preventing siltation for road administration. The structure can not only use a flushing device to flush and dredge the water inlet pipe, but also use pressurized water to reversely flush the permeable geotextile wrapped around the water inlet pipe, thereby restoring the water permeability of the permeable geotextile and improving the drainage effect of the drainage device.

[0066] The above embodiments of the present invention are described in detail, and the contents are only preferred embodiments of the present invention, and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of application of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A method for preventing siltation and drainage for road administration, characterized in that: It includes a drainage unit and a flushing unit; The drainage unit includes a water inlet pipe partially placed in the pipeline of the road cutting slope and a tee pipe connected to the water inlet pipe and placed at the end of the water inlet pipe located on the outer side of the road cutting slope; At two ends of the tee pipe away from the water inlet pipe, one is provided with a flushing sleeve and the other is provided with a drain pipe; The water inlet pipe is placed in the road cutting slope and has a plurality of water permeable holes along the periphery of its wall surface; The flushing unit includes a flushing pipe partially inserted into the water inlet pipe; The three-way pipe can discharge groundwater into the side ditch below the road cutting slope through the drainage pipe after the groundwater enters the water inlet pipe through the water permeable hole and converges; or, During flushing operation, the three-way pipe can inject water into the water inlet pipe through the flushing pipe via the flushing sleeve to increase the air pressure in the water inlet pipe, and then the sludge water is pressurized and discharged from the drain pipe to the side ditch; The water inlet pipe is inclined upward by 6-10° along the horizontal ground direction; the length of the water inlet pipe placed inside the road cutting slope is greater than the length of the water inlet pipe placed outside the road cutting slope; A detachable plug is provided at one end of the flushing sleeve and the drain pipe away from the tee pipe; A layer of permeable geotextile is also provided on the periphery of the outer wall of the water inlet pipe, and the geotextile is arranged to wrap the water inlet pipe, and its length at least covers a section of the water inlet pipe having the permeable holes; During flushing, first block the outlet of the drain pipe with a plug, then insert the flushing pipe into the water inlet pipe after passing through the flushing sleeve and the tee pipe, and place the head of the flushing pipe within 0.5m of the top of the water inlet pipe. The purpose is to quickly and accurately inject more water into the water inlet pipe, so that the water flow can completely flush down from the top of the water inlet pipe immediately, maximizing the length of the flushing with silt accumulated in the water inlet pipe; at the same time, the water entering the water inlet pipe reversely flushes the silt on the geotextile.

2. A road administration anti-clogging and drainage method according to claim 1, characterized in that: The drain pipe is located below the flushing sleeve; and the length of the drain pipe extends to just above the location of the side ditch.

3. A road administration anti-clogging and drainage method according to any one of claims 1-2, characterized in that: The length of the flushing pipe is greater than the length of the water inlet pipe.

4. A road administration anti-clogging and drainage method according to claim 3, characterized in that: The diameter of the irrigation tube is smaller than the diameter of the irrigation sleeve.

5. A road administration anti-clogging and drainage method according to claim 4, characterized in that: A rubber water stopper is also provided between the flushing pipe and the flushing sleeve.

6. A road administration anti-clogging and drainage method according to claim 1, characterized in that: The diameters of the water inlet pipe and the drain pipe are both 100 mm.

7. A road administration anti-clogging and drainage method according to any one of claims 1-2 and 4-6, characterized in that the steps include: S1, when draining; S11, first blocking the outlet of the flushing sleeve and opening the outlet of the drain pipe; S12, the groundwater enters the water inlet pipe through the water permeable hole and then flows into the side ditch through the drainage pipe; S2, when flushing; S21, first blocking the outlet of the drain pipe; S22, open the outlet of the flushing sleeve; make the flushing pipe pass through the flushing sleeve, the tee pipe and the water inlet pipe in sequence, and make the distance from the top of the flushing pipe to the top of the water inlet pipe no more than 0.5m; S23, setting a rubber water stopper at the gap between the flushing pipe and the flushing sleeve to seal it, and connecting the flushing pipe to an external water supply source; S24, inject water into the water inlet pipe at a water injection pressure of 0.4 MPa, and maintain the pressure for 2 minutes; S25, remove the plug at the end of the drain pipe and start flushing with water for 3 minutes; S26, repeat S21-25 until the water discharged from the drain pipe is clear water.

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