Drainage ditch for permafrost region roadbed and construction method

Abstract

The invention relates to the field of permafrost roadbed drainage facilities, in particular to a drainage ditch for a permafrost region roadbed and a construction method. The drainage ditch comprises a first mounting groove dug in the frozen soil roadbed, a second mounting groove dug in the bottom of the first mounting groove, water-stop sheets vertically arranged at the bottom of the second mounting groove, and drainage blind ditches laid at the bottom of the second mounting groove and located between the water-stop sheets, wherein the surfaces of the water-stop sheets are attached to the inner walls of the second mounting groove; the first heat preservation part is laid on the upper portion of the drainage blind ditch, an opening is formed in the upper portion of the first heat preservation part, the drainage grooves are laid in the opening of the first heat preservation part, the water stop belts are connected between every two adjacent drainage grooves, and the second heat preservation part is laid between the first installation groove and the water stop plate. The water baffle is arranged on the top face of the second heat preservation part and located between the first installation groove and the water stop plate, the top of the water baffle is higher than a groove opening of the drainage groove, and the effect of effective drainage and protection of the permafrost region roadbed is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of permafrost roadbed drainage facilities, in particular to a drainage ditch for permafrost roadbed and a construction method. BACKGROUND

[0002] At present, with the continuous advancement of infrastructure construction in the high-cold mountainous areas of the northwest region, especially the extensive development of road engineering, the climate is relatively cold, and the ground temperature at a certain depth below the ground often remains below 0 DEG, some soil does not melt for three years or more than three years, which will form permafrost, and the stability of permafrost roadbed is facing severe challenges. Drainage ditch is a facility for guiding and managing water flow, usually a linear channel, ditch or groove. The main function of the drainage ditch is to collect, guide and discharge rainwater, surface water and other liquids to prevent water accumulation and waterlogging, reduce the risk of water disasters, and protect buildings, roadbeds and the environment.

[0003] At present, the two sides of the permafrost roadbed in the high-cold mountainous areas are usually directly excavated drainage ditches for drainage on both sides of the permafrost roadbed. Due to its special geographical and climatic conditions, roadbed drainage has always been a difficult problem in engineering. The traditional concrete constructed drainage ditch is prone to deformation and damage in the permafrost area, resulting in failure of the drainage function, and the continuous erosion of external moisture causes damage to the roadbed body, which seriously affects the safe operation of the road.

[0004] The prior art in the above has the following defects: the drainage ditch is prone to frost heaving and thawing sinking in the permafrost area, resulting in failure of the drainage function, and even damage to the roadbed, and it is difficult to form effective isolation between the surface water and the water power of the active layer of frozen soil, which cannot effectively prevent the damage of frost heaving force to the ditch body. SUMMARY

[0005] In order to effectively drain and protect the permafrost roadbed, the present application provides a drainage ditch for permafrost roadbed and a construction method.

[0006] In the first aspect, the above technical purpose of the present application is achieved by the following technical scheme:

[0007] The application discloses a drainage ditch for a permafrost roadbed, which comprises a first installation groove dug on the permafrost roadbed, a second installation groove dug at the bottom of the first installation groove, a waterproof plate vertically arranged at the bottom of the second installation groove and with a plate surface respectively adhered to the inner wall of the second installation groove, a drainage blind ditch laid at the bottom of the second installation groove and between the waterproof plates, a first heat preservation member laid at the upper portion of the drainage blind ditch and provided with an opening at the upper portion, a plurality of drainage grooves laid in the opening of the first heat preservation member, a water stop belt connected between two adjacent drainage grooves, a second heat preservation member laid between the first installation groove and the waterproof plate, and a water baffle arranged at the top surface of the second heat preservation member and between the first installation groove and the waterproof plate, wherein the top portion of the water baffle is higher than the opening of the drainage groove.

[0008] By adopting the technical scheme, the installation groove dug on the permafrost roadbed can provide a good construction foundation for the drainage ditch, the vertically arranged waterproof plate forms a vertical curtain type barrier to the inner wall of the second installation groove, thereby effectively blocking the penetration trend of the frozen layer water into the interior of the drainage ditch, effectively isolating the water power of the surface water and the active layer of the frozen soil through the curtain type barrier, reducing the damage of the frost heaving force to the ditch body, and the water baffle can effectively and quickly guide the surface runoff on both sides of the drainage ditch, so that the surface runoff is discharged from the drainage ditch, the heat preservation member is used for heat preservation of the permafrost roadbed near the drainage ditch, and the thawing sinking risk is reduced.

[0009] Optionally, the drainage blind ditch comprises a gravel layer laid at the bottom of the second installation groove and between the waterproof plates and a permeable pipe laid in the gravel layer.

[0010] By adopting the technical scheme, the drainage blind ditch is arranged at the bottom of the second installation groove, the drainage capacity is improved, the gravel layer can further disperse the frost heaving stress of the permafrost roadbed, and the possibility of damage of the drainage ditch is further reduced.

[0011] Optionally, the gravel layer is further provided with a support frame, the support frame comprises a first U-shaped rod, a second U-shaped rod with the U-shaped opening of the first U-shaped rod and the second U-shaped rod being consistent in direction, and a support rod connected with the first U-shaped rod and the second U-shaped rod, and one end of the support rod is located in the opening of the first U-shaped rod.

[0012] By adopting the technical scheme, the permeable pipe is arranged on the support frame, the permeable pipe can be supported in the gravel layer, a plurality of permeable pipes are limited, and the permeable pipe is not prone to position deviation in the gravel layer.

[0013] Optionally, a pad is laid at the bottom of the second installation groove and at the bottom of the drainage blind ditch.

[0014] By adopting the technical scheme, the cushion plate cooperates with the oppositely arranged waterproof plate, which can further isolate the water in the frozen soil subgrade from entering the drainage ditch and improve the stability of the drainage ditch bottom, thereby laying a good foundation for the overall construction of the drainage ditch.

[0015] Optionally, the inner wall of the drainage groove is coated with an anti-seepage layer.

[0016] By adopting the technical scheme, the anti-seepage layer can effectively improve the anti-seepage performance of the drainage groove.

[0017] Optionally, the end face of the drainage groove is provided with a clamping groove for clamping the water stop belt.

[0018] The water stop belt comprises a sealing belt, a first connecting belt fixedly connected to one side of the sealing belt, a circular tube portion fixedly connected to the outer wall of the first connecting belt away from the sealing belt, and a second connecting belt fixedly connected to the outer wall of the circular tube portion and symmetrically arranged with the first connecting belt, and the sealing belt and the circular tube portion can be clamped into the clamping groove.

[0019] By adopting the technical scheme, the outer surface of the water stop belt is irregular in shape, which can increase the contact area between the water stop belt and the end face of the drainage groove, and effectively improve the positioning accuracy of adjacent drainage grooves during laying of the drainage groove.

[0020] Optionally, the top of the water baffle is processed with an inclined surface inclined downward from the waterproof plate to the inner wall of the first mounting groove.

[0021] By adopting the technical scheme, the water baffle with the inclined surface can guide the surface runoff away from the two sides of the drainage ditch, effectively preventing the water from seeping into the interior of the frozen soil subgrade.

[0022] Optionally, the drainage ditch further comprises a connecting assembly for connecting the second heat preservation member and the water baffle.

[0023] The connecting assembly comprises a bottom plate, a connecting rod fixedly connected to one end of the bottom plate, and a second screw threadedly connected to the connecting rod.

[0024] The water baffle is provided with a blind hole for the connecting rod and the second screw to pass through.

[0025] By adopting the technical scheme, the water baffle and the second heat preservation member are stably connected, and after the second heat preservation member and the water baffle are connected, they are simultaneously placed in the first mounting groove, which can improve the stability of the water baffle during use.

[0026] Optionally, the groove bottoms of the first mounting groove and the second mounting groove are respectively provided with drill holes, and the drill holes are filled with an alkali-resistant neutralizing material.

[0027] By adopting the technical scheme, the alkaline substances in the frozen soil subgrade at the bottom of the drainage ditch can be neutralized, the frozen soil subgrade is chemically improved, and the alkaline resistance of the frozen soil subgrade is improved.

[0028] In a second aspect, the application provides a construction method of a drainage ditch for a permafrost region subgrade, comprising the following steps:

[0029] Step one, digging a first installation groove and a second installation groove on the frozen soil subgrade, and drilling a drill hole at the bottom of the installation groove;

[0030] Step two, filling the anti-alkali neutralizing agent into the drill hole;

[0031] Step three, installing a waterproof board in the second installation groove;

[0032] Step four, laying a pad on the bottom of the second installation groove and between the waterproof boards;

[0033] Step five, laying a blind drainage ditch on the pad;

[0034] Step six, laying a first heat preservation piece on the upper part of the blind drainage ditch;

[0035] Step seven, installing a drainage groove in the first heat preservation piece, and sealing and connecting adjacent drainage grooves by a water stop belt;

[0036] Step eight, installing a cover plate on the drainage groove, which effectively prevents sundries from entering the drainage groove during subsequent construction;

[0037] Step nine, connecting the second heat preservation piece with the water baffle by using a connecting assembly and placing the second heat preservation piece between the first installation groove and the waterproof board;

[0038] Step ten, installing a heat rod on the frozen soil subgrade.

[0039] In summary, the application has the following technical effects:

[0040] 1. By arranging the installation groove, the waterproof board, the blind drainage ditch, the heat preservation piece, the drainage groove, the water stop belt, and the water baffle, the waterproof board forms a vertical curtain type barrier on the inner wall of the second installation groove, thereby effectively blocking the penetration trend of the frozen layer water into the drainage ditch, effectively isolating the water power of the surface water and the active layer of the frozen soil through the curtain type barrier, reducing the damage of the frost heaving force to the ditch body, and the water baffle can effectively and quickly guide the surface runoff on both sides of the drainage ditch, so that the surface runoff is discharged to the drainage ditch, and the heat preservation piece is used to heat the frozen soil subgrade near the drainage ditch, while reducing the risk of thawing settlement;

[0041] 2. By arranging the gravel layer and the permeable pipe, the drainage capacity can be enhanced, and the gravel layer can also disperse the frost heaving stress of the frozen soil subgrade, further reducing the possibility of damage to the drainage ditch;

[0042] 3. By setting the pad, the pad cooperates with the oppositely arranged waterproof plate, which can further isolate the water in the frozen soil subgrade from entering the drainage ditch, and also can improve the stability of the drainage ditch bottom pavement, and lays a good foundation for the overall construction of the drainage ditch. BRIEF DESCRIPTION OF DRAWINGS

[0043] Figure 1 is the outer shape structure diagram of the embodiment one of the present application;

[0044] Figure 2 is the outer shape structure diagram of the embodiment two of the present application;

[0045] Figure 3 is the structure diagram of the installation slot and the drilling hole in the embodiment two of the present application;

[0046] Figure 4 is the structure diagram of the support frame in the embodiment two of the present application;

[0047] Figure 5 is the structure diagram of the drainage groove and the water stop belt in the embodiment two of the present application;

[0048] Figure 6 is the assembly structure diagram of the second heat preservation piece, the water baffle and the connecting assembly in the embodiment two of the present application;

[0049] Figure 7 is the construction method flow chart of the embodiment three of the present application.

[0050] BRIEF DESCRIPTION OF DRAWINGS 1, frozen soil subgrade; 11, first installation slot; 111, first drilling hole; 12, second installation slot; 121, second drilling hole; 13, pad; 14, hot stick; 2, waterproof plate; 3, drainage blind ditch; 31, gravel layer; 32, support frame; 321, first U-shaped rod; 322, second U-shaped rod; 323, support rod; 33, permeable pipe; 4, first heat preservation piece; 5, drainage groove; 51, first clamping slot; 52, second clamping slot; 53, counterbore; 54, pre-buried nut; 55, cover plate; 56, first bolt; 6, water stop belt; 61, sealing belt; 62, first connecting belt; 63, round pipe part; 64, second connecting belt; 7, second heat preservation piece; 8, water baffle; 9, connecting assembly; 91, bottom plate; 92, connecting rod; 93, second bolt. DETAILED DESCRIPTION

[0051] The present application will be further described in detail below with reference to the accompanying drawings.

[0052] Embodiment one

[0053] The embodiment of the present application discloses a drainage ditch for subgrade in permafrost region, referring to Figure 1The drainage ditch is arranged on the frozen soil roadbed 1, the first installation groove 11 is arranged on the frozen soil roadbed 1, the second installation groove 12 is arranged in the middle of the groove bottom of the first installation groove 11, the width of the second installation groove 12 is smaller than that of the first installation groove 11, and the cushion plate 13 is arranged in the groove bottom of the second installation groove 12.

[0054] The water stop plate 2 is arranged in the second installation groove 12, the water stop plate 2 is made of cement-soil mixed anti-seepage material, such as bentonite water stop plate, the oppositely arranged water stop plates 2 are vertically arranged and the plate surfaces of the water stop plates 2 are attached to the opposite two inner walls of the second installation groove 12, and the top of the water stop plate 2 is flush with the groove opening of the first installation groove 11. The buried depth of the water stop plate 2 extends to 0.5-0.8 meters below the upper limit of the frozen soil. The cushion plate 13 is located between the oppositely arranged water stop plates 2, and the opposite two side walls of the cushion plate 13 are respectively attached to the opposite plate surfaces of the oppositely arranged water stop plates 2. The vertically arranged water stop plates 2 form a vertical curtain type barrier for the second installation groove 12, block the penetration of the frozen layer water to the drainage ditch, effectively isolate the water power of the surface water and the active layer of the frozen soil through the curtain type barrier, reduce the damage of the frost heaving force to the ditch body, and reduce the risk of thawing settlement.

[0055] The drainage blind ditch 3 is arranged on the upper part of the cushion plate 13, the drainage blind ditch 3 comprises a gravel layer 31 arranged on the cushion plate 13 and a plurality of water permeable pipes 33 buried in the gravel layer 31. The gravel layer 31 is made of gravel with a particle size of 15-30 centimeters, and the top surface height of the gravel layer 31 is lower than the groove bottom of the first installation groove 11.

[0056] The first heat preservation piece 4 is arranged on the gravel layer 31, the first heat preservation piece 4 is made of polystyrene foam board. The top of the first heat preservation piece 4 is flush with the groove opening of the first installation groove 11, and the outer shape of the first heat preservation piece 4 is matched with the space between the oppositely arranged water stop plates 2, and the upper part of the first heat preservation piece 4 is provided with an opening with a U-shaped end face.

[0057] The drainage groove 5 with a U-shaped end face is arranged in the opening of the first heat preservation piece 4, the groove opening of the drainage groove 5 is lower than the opening of the first heat preservation piece 4, and the outer wall of the drainage groove 5 is attached to the inner wall of the opening of the first heat preservation piece 4. The drainage groove 5 is made of prefabricated U-shaped concrete groove and is assembled, and an epoxy resin anti-seepage layer is coated on the inner wall of the drainage groove 5 to improve the anti-seepage performance of the drainage groove 5. The cover plate 55 is arranged at the groove opening of the drainage groove 5, the cover plate 55 is embedded in the gap formed by the drainage groove 5 and the opening of the first heat preservation piece 4, and the upper plate surface of the cover plate 55 is flush with the opening of the first heat preservation piece 4, and the cover plate 55 is used to prevent large-volume sundries from entering the drainage groove 5. The water stop belt 6 is arranged between the adjacent two drainage grooves 5 to improve the anti-seepage performance of the connection part of the adjacent drainage grooves 5.

[0058] A second heat insulating member 7 is arranged between the inner wall of the first installation groove 11 and the waterproof board 2, and the second heat insulating member 7 is a heat insulating member made of polystyrene foam board. In the embodiment, the thickness of the second heat insulating member is 30 cm. The upper plate surface of the second heat insulating member 7 is lower than the plane of the frozen soil subgrade 1.

[0059] The side wall of the second installation groove 12, the upper plate surface of the second heat insulating member, and the side wall of the waterproof board 2 form a groove, and a water baffle 8 is arranged in the groove. The water baffle 8 can be made of high-density polyethylene material or aluminum alloy material, has the characteristics of light weight and high strength, and can effectively prolong the service life of the water baffle 8.

[0060] The width of the water baffle 8 is consistent with the width of the groove, and the thickness of the water baffle 8 is greater than the depth of the groove, that is, the upper plate surface of the water baffle 8 is higher than the upper plate surface of the cover plate 55. An inclined surface is formed on the upper part of the water baffle 8, which is inclined downward from the side of the first installation groove 11 towards the waterproof board 2, and the inclination angle is 10° to 30°. The water baffle 8 can guide the surface runoff to quickly flow away from the two sides of the drainage ditch, effectively preventing water from seeping into the inside of the frozen soil subgrade 1.

[0061] Embodiment two

[0062] The difference between the embodiment and the embodiment one is that:

[0063] Referring to Figure 2 A plurality of heat rods 14 are arranged on the frozen soil subgrade 1 and on both sides of the width direction of the first installation groove 11. The heat rods 14 can transfer heat between the bottom of the frozen soil subgrade 1 and the heat in the air outside the frozen soil subgrade 1, thereby keeping the frozen soil subgrade 1 from softening and effectively improving the cold resistance of the frozen soil subgrade 1.

[0064] Referring to Figure 3 A plurality of first drill holes 111 are drilled in the bottom of the first installation groove 11, and a plurality of second drill holes 121 are drilled in the bottom of the second installation groove 12. Phosphogypsum or gypsum is filled in the drill holes, which can neutralize the alkaline substances in the inside of the frozen soil subgrade 1 at the bottom of the drainage ditch, achieve the purpose of chemical improvement of the frozen soil subgrade 1, and improve the alkali resistance of the frozen soil subgrade 1.

[0065] Referring to Figure 4The support frame 32 is embedded in the gravel layer 31, and comprises a first U-shaped rod 321, a second U-shaped rod 322, and a plurality of support rods 323 fixed to the first U-shaped rod 321 and the second U-shaped rod 322. The U-shaped openings of the first U-shaped rod 321 and the second U-shaped rod 322 are consistent. The plurality of support rods 323 are arranged at equal intervals along the length direction of the U-shaped rods, and the length direction of the support rods 323 is consistent with the direction of the U-shaped openings of the U-shaped rods. The lower end of the support rod 323 is fixedly connected to a section of the length direction of the second U-shaped rod 322, and the end close to the upper end of the support rod 323 is fixed to one end of the length direction of the first U-shaped rod 321, so that the support rod 323 and the U-shaped opening of the U-shaped rod form a plurality of continuous clamping openings, and the plurality of water permeable pipes 33 are arranged in the clamping openings, which can not only support the water permeable pipes 33 in the gravel layer 31, but also limit the plurality of water permeable pipes 33.

[0066] With reference to Figure 5 The end surface of the drainage groove 5 is provided with a first clamping groove 51 and a second clamping groove 52. The first clamping groove 51 is located at the connection between the end surface of the drainage groove 5 and the inner wall, and the second clamping groove 52 is located at the middle of the end surface of the drainage groove 5. Both the first clamping groove 51 and the second clamping groove 52 are in a U-shaped structure.

[0067] With reference to Figure 5 In this embodiment, the sealing tape 61, the first connecting tape 62, the circular tube part 63, and the second connecting tape 64 are integrally formed by machining, so as to improve the overall anti-seepage performance of the water stop tape 6.

[0068] The thickness of the sealing tape 61 is consistent with the thickness of the first clamping groove 51, the width of the first connecting tape 62 and the second connecting tape 64 is consistent, and the first connecting tape 62 and the second connecting tape 64 can be respectively attached to the end surface of the drainage groove 5. The outer wall of the circular tube part 63 located on the same side as the connecting tape is adapted to the second clamping groove 52 and can be clamped into the second clamping groove 52. When the drainage groove 5 is laid, the water stop tape 6 is clamped into the clamping grooves of the opposite end surfaces of the adjacent two drainage grooves 5, so as to improve the anti-seepage performance of the connection between the adjacent two drainage grooves 5. The outer surface of the water stop tape 6 is in an irregular shape, which can increase the contact area between the water stop tape 6 and the end surface of the drainage groove 5, and effectively improve the positioning accuracy of the adjacent drainage grooves 5 when the drainage groove 5 is laid.

[0069] With reference to Figure 5Two counter-bore holes 53 are formed in the top surface on both sides of the groove opening of the drain groove 5, and embedded nuts 54 are embedded and fixed in the counter-bore holes 53. The cover plate 55 is provided with through holes at the four corners of the plate surface, and first bolts 56 are arranged in the through holes. The first bolts 56 can be screwed with the embedded nuts 54 and penetrate into the counter-bore holes 53, so that the cover plate 55 can be stably connected to the drain groove 5. When the inside of the drain groove 5 needs to be cleaned, the first bolts 56 can be unscrewed to remove the cover plate 55.

[0070] Referring to Figure 6 A connecting assembly 9 for connecting the water baffle 8 is arranged at the groove bottom of the first installation groove 11. The connecting assembly 9 includes a bottom plate 91, a connecting rod 92 having one end fixedly connected to the plate surface of the bottom plate 91 and having a length direction perpendicular to the plate surface, and a second bolt 93 screwed on the connecting rod 92. The end of the connecting rod 92 away from the bottom plate 91 is a pointed end, and a threaded hole for screwing the second bolt 93 is formed on a section of the connecting rod 92 close to the pointed end. A blind hole is formed on the bottom surface and the side surface of the water baffle 8 on the side with a larger thickness, and the two blind holes are 90° apart and communicate with each other. When in use, the pointed end of the connecting rod 92 penetrates through the second heat preservation member 7 and penetrates into the blind hole in the bottom surface of the water baffle 8. At this time, the threaded hole corresponds to the blind hole in the side surface of the water baffle 8, and the second bolt 93 is screwed into the side surface blind hole and screwed with the threaded hole. Thus, the water baffle 8 and the second heat preservation member 7 can be stably connected. After the second heat preservation member 7 and the water baffle 8 are connected, they are placed in the first installation groove 11, which can improve the stability of the water baffle 8 during use.

[0071] Embodiment three

[0072] The embodiment of the present application discloses a construction method of a drainage ditch for a permafrost region roadbed, referring to Figure 7 , the construction method comprises the following steps:

[0073] Step one, a first installation groove 11 and a second installation groove 12 are dug on the permafrost roadbed 1, and a first drill hole 111 and a second drill hole 121 are drilled at the groove bottoms of the first installation groove 11 and the second installation groove 12, respectively. The first installation groove 11 and the second installation groove 12 provide an installation base for the drainage ditch structure;

[0074] Step two, alkali-resistant neutralizing agents are filled into the first drill hole 111 and the second drill hole 121, respectively;

[0075] Step three, a water stop plate 2 is installed in the second installation groove 12 and adheres to the opposite inner walls thereof;

[0076] Step four, a pad 13 is laid on the groove bottom of the second installation groove 12 and between the water stop plates 2;

[0077] Step five, laying the drainage blind ditch 3 on the cushion plate 13, first placing the support frame 32 on the cushion plate 13 and penetrating the water pipe 33, and then laying the gravel layer 31;

[0078] Step six, laying the first thermal insulation member 4 between the waterproof plates 2 and on the upper part of the gravel layer 31;

[0079] Step seven, placing the drainage groove 5 in the first thermal insulation member 4, and sealing and connecting two adjacent drainage grooves 5 through the water stop belt 6;

[0080] Step eight, installing the cover plate 55 on the drainage groove 5, which effectively prevents sundries from entering the drainage groove 5 in the subsequent construction process;

[0081] Step nine, connecting the second thermal insulation member 7 with the water baffle 8 using the connecting assembly 9 and placing it between the first installation groove 11 and the waterproof plate 2;

[0082] Step ten, inserting the heat rod 14 on both sides of the drainage ditch on the frozen soil subgrade 1, and arranging the heat rod 14 and the water baffle 8 at intervals.

[0083] The above drainage ditch construction method can realize effective drainage of the subgrade in the frozen soil area through the curtain isolation structure and the optimized drainage ditch structure, thereby isolating the hydraulic connection between the surface water and the active layer of the frozen soil, reducing the damage of the frost heaving force of the frozen soil subgrade 1 to the ditch body, and achieving the purposes of reducing the thaw settlement risk and prolonging the service life of the drainage ditch.

[0084] The specific embodiments are only an explanation of the present application, and are not a limitation of the present application. Those skilled in the art can make modifications to the embodiments without creative contribution after reading the present specification, and the modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A drainage ditch for a permafrost zone embankment, laid on a permafrost embankment (1), characterized in that: The first installation groove (11) is dug on the frozen soil roadbed (1), the second installation groove (12) is dug at the bottom of the first installation groove (11), the waterproof board (2) is vertically arranged at the bottom of the second installation groove (12) and the plate surface is respectively attached to the inner wall of the second installation groove (12), the drainage blind ditch (3) is laid at the bottom of the second installation groove (12) and between the waterproof boards (2), the first heat preservation piece (4) is laid on the upper part of the drainage blind ditch (3) and the upper part is provided with an opening, a plurality of drainage grooves (5) are laid in the opening of the first heat preservation piece (4), the water stop belt (6) is connected between two adjacent drainage grooves (5), the second heat preservation piece (7) is laid between the first installation groove (11) and the waterproof board (2), and the water baffle (8) is arranged on the top surface of the second heat preservation piece (7) and between the first installation groove (11) and the waterproof board (2), and the top of the water baffle (8) is higher than the groove opening of the drainage groove (5).

2. The drain for embankment in permafrost zone according to claim 1, characterized in that: The drainage blind ditch (3) comprises a gravel layer (31) laid on the groove bottom of the second installation groove (12) and between the waterproof boards (2) and a permeable pipe (33) laid in the gravel layer (31).

3. The drain for the embankment in the permafrost zone according to claim 2, characterized in that: The support frame (32) is further arranged in the gravel layer (31), the support frame (32) comprises a first U-shaped rod (321), a second U-shaped rod (322) with the same U-shaped opening direction as the first U-shaped rod (321), and a support rod (323) connected with the first U-shaped rod (321) and the second U-shaped rod (322), one end of the support rod (323) is located in the opening of the first U-shaped rod (321).

4. The drain for embankment in permafrost zone according to claim 2, characterized in that: The second installation groove (12) is provided with a pad (13) at the groove bottom and the bottom of the drainage blind ditch (3).

5. The drain for the embankment in the permafrost zone according to claim 1, characterized in that: The inner wall of the drainage groove (5) is coated with an anti-seepage layer.

6. The drain for a roadbed in a permafrost region according to claim 5, characterized in that: The end surface of the drainage groove (5) is provided with a clamping groove for clamping the water stop belt (6); The water stop belt (6) comprises a sealing belt (61), a first connecting belt (62) fixed to one side of the sealing belt (61), a circular tube portion (63) fixed to the outer wall of the first connecting belt (62) away from the sealing belt (61), and a second connecting belt (64) fixed to the outer wall of the circular tube portion (63) and symmetrically arranged with the first connecting belt (62), and the sealing belt (61) and the circular tube portion (63) can be clamped into the clamping groove.

7. The drain for the embankment in the permafrost zone according to claim 1, characterized in that: The top of the water baffle (8) is processed with an inclined surface downward from the waterproof board (2) to the inner wall of the first installation groove (11).

8. The drain for a roadbed in a permafrost region according to claim 7, characterized in that: The drainage ditch further comprises a connecting assembly (9) for connecting the second heat preservation piece (7) and the water baffle (8). The connecting assembly (9) comprises a bottom plate (91), a connecting rod (92) fixed to one end of the bottom plate (91), and a second bolt (93) threadedly connected with the connecting rod (92). The water baffle (8) is provided with a blind hole for the connecting rod (92) and the second bolt (93) to pass through.

9. The drainage ditch for embankment in permafrost regions according to any one of claims 1-8, characterized in that: Drilling holes are respectively drilled in the groove bottoms of the first installation groove (11) and the second installation groove (12), and alkali-resistant neutralizing substances are filled in the drilling holes.

10. A construction method for a drainage ditch of a roadbed in a permafrost region, characterized by: The construction steps include: Step one, dig the first installation groove (11) and the second installation groove (12) on the frozen soil subgrade (1), and drill a drill hole at the bottom of the installation groove; Step two, fill the alkali-resistant neutralizer into the drill hole; Step three, install the waterproof board (2) in the second installation groove (12); Step four, lay the pad (13) on the bottom of the second installation groove (12) and between the waterproof boards (2); Step five, lay the drainage blind ditch (3) on the pad (13); Step six, lay the first heat preservation piece (4) on the upper part of the drainage blind ditch (3); Step seven, install the drainage groove (5) in the first heat preservation piece (4), and seal and connect the adjacent drainage grooves (5) through the water stop belt (6); Step eight, install the cover plate (55) on the drainage groove (5), which effectively prevents sundries from entering the drainage groove (5) during subsequent construction; Step nine, connect the second heat preservation piece (7) and the water baffle (8) using the connecting assembly (9) and place them between the first installation groove (11) and the waterproof board (2); Step ten, install the heat rod (14) on the frozen soil subgrade (1).

Images