A UHPC siphon-type auxiliary drainage system for ultra-wide asphalt pavement and its construction method

Abstract

This invention discloses an ultra-wide asphalt pavement UHPC siphon-type auxiliary drainage system and its construction method, including an inner road auxiliary drainage pipe, a roadside rainwater collection well, and a rainwater pipe. The inner road auxiliary drainage pipe is installed within the asphalt pavement surface layer and above the top surface of the pavement base layer. The inlet of the inner road auxiliary drainage pipe is flush with the asphalt pavement and is located next to the lane marking on the lower elevation side of the inner lane of the ultra-wide pavement. The outlet of the inner road auxiliary drainage pipe connects to the roadside rainwater collection well. The rainwater pipe is located below the roadside rainwater collection well, with its upper end connected to the bottom surface of the roadside rainwater collection well and its lower end connected to the municipal drainage network. A siphon-type rainwater hopper is installed at the interface between the roadside rainwater collection well and the rainwater pipe. This invention has low construction difficulty and, for road sections prone to water accumulation such as those with gentle slopes, changes the drainage path of surface water on ultra-wide asphalt pavements, improves the surface water drainage efficiency of the inner lane, and ensures road driving safety.

Description

Technical Field

[0001] This invention relates to the technical field of road engineering, and in particular to an ultra-wide asphalt pavement UHPC siphon-type auxiliary drainage system, as well as a construction method for the ultra-wide asphalt pavement UHPC siphon-type auxiliary drainage system. Background Technology

[0002] With the continuous development of cities, traffic volume in densely populated areas is increasing year by year. Road traffic has become an irreplaceable mode of transportation for urban operations and residents' travel. To ensure that the capacity of major traffic arteries meets traffic demands, extra-wide roads with ten or more lanes in both directions are adopted. However, the continuous widening of roads has brought about the problem of poor road drainage. Especially in the rainy southern regions, heavy rains occur frequently and last for a long time, making extra-wide roads prone to water accumulation. When road drainage is poor, surface water cannot drain out and fills the gaps in the road surface, causing a sharp decrease in the anti-skid performance of the road surface, leading to skidding and accidents. It is evident that the frequent occurrence of traffic accidents in rainy weather is inevitably related to road water accumulation. Road driving safety is an important guarantee for people's travel, and reducing traffic accidents has become a key focus of relevant departments. Therefore, improving the drainage effect of road drainage systems, reducing road water accumulation and residual rainwater on the road surface are crucial for improving road driving safety, reducing traffic accidents, and minimizing loss of life and property caused by traffic accidents.

[0003] Research has found that the main reason for poor drainage in ultra-wide asphalt pavements is:

[0004] (1) The surface water drainage path of the inner lane is long and needs to reach the roadside rainwater inlet through the outer lane. The surface water passes through the rough road surface for a long time, which hinders its drainage rate.

[0005] (2) The low drainage rate of rainwater inlets and rainwater pipes leads to water accumulation on the road;

[0006] (3) The road design has a relatively gentle longitudinal slope and a small combined gradient, which leads to poor drainage.

[0007] Therefore, there is an urgent need to propose a road drainage solution for poorly drained ultra-wide asphalt pavement sections to solve the above problems, reduce road surface water accumulation, and ensure road driving safety. Summary of the Invention

[0008] Based on the shortcomings of the existing technology, the technical problem to be solved by the present invention is to provide an ultra-wide asphalt pavement UHPC siphon-type auxiliary drainage system and its construction method. The system has a simple structure and low construction difficulty. For road sections with gentle slopes and other sections prone to water accumulation, it changes the drainage path of surface water on ultra-wide asphalt pavement, improves the surface water drainage efficiency of the inner lane, reduces surface water accumulation, and ensures road driving safety.

[0009] To achieve the above objectives, the present invention employs the following technical measures:

[0010] An ultra-wide asphalt pavement UHPC siphon-type auxiliary drainage system includes an inner road auxiliary drainage pipe, a roadside rainwater collection well, and a rainwater pipe. The inner road auxiliary drainage pipe is installed within the asphalt pavement surface layer and above the top surface of the pavement base layer. The inlet of the inner road auxiliary drainage pipe is flush with the asphalt pavement and is located next to the lane marking on the lower elevation side of the inner lane of the ultra-wide pavement. The outlet of the inner road auxiliary drainage pipe is connected to the roadside rainwater collection well. The rainwater pipe is located below the roadside rainwater collection well. The upper end of the rainwater pipe is connected to the bottom surface of the roadside rainwater collection well, and its lower end is connected to the municipal drainage network. A siphon-type rainwater hopper is installed at the interface between the roadside rainwater collection well and the rainwater pipe.

[0011] Preferably, the inner road auxiliary drainage pipe is composed of a vertical inlet pipe, a horizontal water conveyance pipe, a longitudinal siphon pipe, and a horizontal outlet pipe, which are gradually decreasing in height. The upper end of the vertical inlet pipe is flush with the asphalt pavement, and its lower end is connected to the horizontal water conveyance pipe. The other end of the horizontal water conveyance pipe is connected to the upper end of the longitudinal siphon pipe, and the lower end of the longitudinal siphon pipe is connected to the horizontal outlet pipe. The other end of the horizontal outlet pipe is connected to the roadside rainwater collection well.

[0012] Preferably, the rainwater pipe is composed of a tail pipe, a horizontal pipe, and a riser, which are gradually decreasing in height. The upper end of the tail pipe is connected to the bottom surface of the roadside rainwater collection well, and its lower end is connected to the horizontal pipe. The other end of the horizontal pipe is connected to the upper end of the riser. The lower end of the riser is connected to the municipal drainage network. The length of each section of the pipe is reasonably set according to the distance between the rainwater collection well and the municipal network. The lengths of the tail pipe and the riser should be as long as possible.

[0013] Furthermore, the inner road auxiliary drainage pipe is a zigzag-shaped pipe with a square cross-section on the outer surface and a circular cross-section on the inner surface.

[0014] Furthermore, the square cross-section of the outer surface of the vertical water inlet pipe, the horizontal water delivery pipe, the longitudinal siphon pipe, and the horizontal water outlet pipe has a side length of 8cm, and the radius of the circular cross-section of its inner surface is 2.5cm.

[0015] Preferably, the length of the vertical inlet pipe is determined based on the thickness of the asphalt pavement surface layer structure; the length of the transverse water supply pipe is determined based on the distance between the vertical inlet pipe and the roadside rainwater collection well; the length of the longitudinal siphon pipe is determined based on the distance between the transverse water supply pipe and the bottom surface of the roadside rainwater collection well, and should be as long as possible; and the length of the transverse outlet pipe is determined based on the thickness of the rainwater collection well wall of the roadside rainwater collection well.

[0016] Preferably, the upper end of the vertical water inlet pipe is provided with a water inlet pipe cover plate, and the water inlet pipe cover plate is provided with rectangular hollow holes with rounded corners; the material of the water inlet pipe cover plate is UHPC high-performance concrete; the water inlet pipe cover plate is a square with a side length of 8cm and a thickness of 1.5cm; the dimensions of the rectangular hollow holes on the water inlet pipe cover plate are 2cm long, 0.5cm wide, and the radius of the rounded corners is 0.1cm; a total of 6 rectangular hollow holes are provided, evenly distributed in the middle position of the water inlet pipe cover plate.

[0017] Furthermore, the inner road auxiliary drainage pipe is made of UHPC ultra-high performance concrete, with a water-cement ratio controlled between 0.16 and 0.18, and the zigzag pipe is integrally cast in one piece.

[0018] Preferably, the bottom interface of the siphon rainwater hopper is sealed to the rainwater pipe and sealed with a waterproof sealing ring. The material of the siphon rainwater hopper is cast iron or stainless steel, and the specific requirements can be found in "CJT245 Siphon Rainwater Hopper 2007".

[0019] Furthermore, the joints between the longitudinal siphon pipe and the road base structure, and between the transverse outlet pipe and the rainwater collection well wall of the roadside rainwater collection well, should all be coated with acrylic waterproof sealant.

[0020] In addition, the construction method of the aforementioned ultra-wide asphalt pavement UHPC siphon-assisted drainage system includes the following steps depending on the construction scenario:

[0021] New road construction scenario:

[0022] S10. Determine the layout location and spacing of the auxiliary drainage pipes on the inner side of the road: The auxiliary drainage pipes on the inner side of the UHPC siphon auxiliary drainage system for ultra-wide asphalt pavement should be installed in sections of the ultra-wide road with gentle longitudinal slopes or widened roads that are prone to poor drainage; the upper end of the vertical inlet pipe should be flush with the asphalt pavement and installed next to the lane markings on the inner lane of the ultra-wide road with the lower elevation, avoiding the wheel track area; the recommended layout spacing is between 25 and 100 mm, which can be adjusted according to the drainage situation;

[0023] S11. Construction of rainwater collection well walls and rainwater pipes: When constructing rainwater collection well walls and reinforcing them, reserve the position for horizontal outlet pipes and ensure convenient overall installation of auxiliary drainage pipes on the inner side of the road; install siphon-type rainwater hoppers at the interface between the bottom of the roadside rainwater collection well and the rainwater pipe as required; install tail pipes, horizontal pipes and vertical pipes in the rainwater pipes, and set the length of each section of pipe reasonably according to the distance between the rainwater collection well and the municipal pipe network, and the length of the tail pipes and vertical pipes should be as long as possible;

[0024] S12. Waterproofing treatment of the top surface of the road base: After the road base is laid and compacted, the location of the inner road auxiliary drainage pipe is determined and marked according to the method of step S10. Waterproof geotextile is laid on the top surface of the base directly below the inner road auxiliary drainage pipe. The size of the waterproof geotextile should extend 20cm around the projection surface of the inner road auxiliary drainage pipe.

[0025] S13. Install inner road auxiliary drainage pipes: Transport the prefabricated inner road auxiliary drainage pipes to the site, ensuring they remain intact during transport; install the inner road auxiliary drainage pipes according to the marked locations, ensuring a tight fit between the road surface structure and the longitudinal siphon pipes, and applying acrylic waterproof sealant to the contact surfaces; ensure the transverse outlet pipes of the inner road auxiliary drainage pipes are tightly fitted to the rainwater collection well walls during installation; and apply acrylic waterproof sealant to the joints.

[0026] S14. Pavement of asphalt pavement surface layer: The asphalt pavement surface layer is laid and compacted. The asphalt pavement surface layer above the auxiliary drainage pipe on the inner side of the road is compacted separately with small machinery to ensure that the drainage pipe is not damaged during the compaction process.

[0027] Construction scenes of road expansion and drainage system renovation:

[0028] S15. Determine the layout location and spacing of the auxiliary drainage pipes on the inner road according to the requirements of step S10. After determining their specific locations and construction scope, mark them on the road surface.

[0029] S16. Pre-treatment of existing road surface, stormwater collection wells, and stormwater pipes: Cold milling of the upper, middle, and lower layers of asphalt pavement within the construction area of ​​the auxiliary drainage pipes on the inner road; the milling range should ensure that waterproof geotextile can be laid; for the collection wells corresponding to the auxiliary drainage pipes on the inner road, the well wall on the side closest to the drainage pipe should be partially removed, leaving space for the transverse outlet pipe; existing stormwater pipes that do not meet the requirements should be modified to ensure that they consist of tail pipes, horizontal pipes, and vertical pipes. The length of each pipe section should be reasonably set according to the distance between the stormwater collection well and the municipal pipe network. The length of the tail pipe and the vertical pipe should be as long as possible. After the modification, a siphon stormwater hopper should be installed.

[0030] S17. Waterproofing treatment of the top surface of the road base and installation of auxiliary drainage pipes on the inner side of the road: The treatment shall be carried out in accordance with the methods described in steps S12 and S13 of the new road construction scenario.

[0031] S18. Repair of water collection well wall and backfilling of asphalt pavement surface: Above the transverse water outlet pipe, carry out the pouring, repair and reinforcement of water collection well wall as required, and backfill and pave the asphalt pavement surface according to step S14 of the new road construction scenario.

[0032] As described above, the present invention provides an ultra-wide asphalt pavement UHPC siphon-type auxiliary drainage system. The upper end of its vertical inlet pipe is flush with the road surface. Surface water enters the inner road auxiliary drainage pipe through this inlet, connects to the roadside rainwater collection well via the horizontal outlet pipe, drains into the collection well, and is then discharged into the municipal pipe network through the rainwater pipe. The UHPC siphon-type auxiliary drainage system of the present invention utilizes the siphon effect to improve drainage efficiency. For the inner road auxiliary drainage pipe, its diameter is relatively small. When there is little surface water, the water flows naturally into the pipe under gravity and is discharged into the rainwater collection well. When there is a lot of surface water, a full-pipe flow forms inside the pipe, resulting in a siphon phenomenon. The lower end of the vertical inlet pipe and the upper end of the longitudinal siphon pipe experience pressure reversal, accelerating the water flow. For the rainwater pipe, its diameter is relatively large, and air is easily mixed in during drainage. The siphon-type rainwater hopper reduces the amount of air mixed into the rainwater, accelerating the formation of a full-pipe flow and generating a siphon in the rainwater pipe. When the water level in the rainwater collection well is low, below the air baffle of the rainwater hopper, water is discharged through the rainwater pipe by gravity. When the water level in the rainwater collection well is high, submerging the rainwater hopper, the siphon-type rainwater hopper has a good air-blocking effect, causing the rainwater pipe to fill with water and form a siphon. At this time, the lower end of the tailpipe and the upper end of the riser create pressure, accelerating the water flow. Depending on the construction scenario, the UHPC siphon-type auxiliary drainage system has different construction methods and steps. By reducing rainwater residue on ultra-wide asphalt pavements, reducing the deposition of rainwater layers on the road surface, improving the road's anti-skid ability, reducing the occurrence of vehicle skidding during driving, and improving road safety.

[0033] Compared with the prior art, the present invention also has the following advantages:

[0034] 1. By using auxiliary drainage pipes on the inner side of the road, the drainage path of surface water on the ultra-wide asphalt pavement is altered, transforming the drainage path from the rough asphalt pavement to a smooth underground UHPC pipe. The siphon effect of the longitudinal siphon pipes accelerates the drainage rate within the pipes, improving the efficiency of surface water discharge from the inner side of the road, reducing rainwater residue in the asphalt pavement voids, reducing the deposition of rainwater layers on the road surface, improving the road's anti-skid ability, and reducing the occurrence of vehicle skidding during driving.

[0035] 2. Install siphon-type rainwater hoppers in the roadside rainwater collection wells. The rainwater hoppers have rectifier grids and air baffles to prevent the formation of excessive vortices, stabilize the water level in front of the hopper, reduce air entrainment, and form a siphon effect in the rainwater drainage pipe, which can accelerate the discharge of water stored in the collection well.

[0036] In summary, the UHPC siphon-assisted drainage system for ultra-wide asphalt pavements of the present invention can improve the drainage capacity of ultra-wide asphalt pavements, enhance road safety, and protect the lives and property of road users. Attached Figure Description

[0037] To more clearly illustrate the technical solution of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a schematic diagram of the structure of the UHPC siphon-type auxiliary drainage system of the present invention;

[0039] Figure 2 This is a schematic diagram of the inner road auxiliary drainage pipe of the present invention;

[0040] The markings in the diagram are: 1-Inlet pipe cover, 2-Lane markings, 3-Vertical inlet pipe, 4-Horizontal water supply pipe, 5-Longitudinal siphon pipe, 6-Horizontal outlet pipe, 7-Waterproof geotextile, 8-Rainwater collection well cover, 9-Roadside rainwater collection well, 10-Siphon rainwater hopper, 11-Rainwater collection well wall, 12-Inner road auxiliary drainage pipe, 13-Tail pipe, 14-Horizontal pipe, 15-Riser pipe, 16-Rainwater pipe. Detailed Implementation

[0041] Preferred embodiments of the present invention are described below. Those skilled in the art will be able to implement them using relevant techniques described below, and will better understand the innovations and benefits of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0042] like Figures 1-2 As shown, the ultra-wide asphalt pavement UHPC siphon-type auxiliary drainage system of the present invention includes an inner road auxiliary drainage pipe 12, a roadside rainwater collection well 9, and a rainwater pipe 16. The dimensions, materials, cover plates, and reinforcement facilities of the roadside rainwater collection well 9 are determined according to relevant municipal road drainage design specifications based on parameters such as road design grade, project location, and rainfall intensity characteristics. A rainwater collection well cover plate 8 is provided on the top of the roadside rainwater collection well 9. The materials, pipe diameter, and pipe wall thickness of the rainwater pipe 16 are determined according to relevant municipal road drainage design specifications based on parameters such as road design grade, project location, and rainfall intensity characteristics.

[0043] The inner road auxiliary drainage pipe 12 is installed within the asphalt pavement surface layer and above the top surface of the road base layer. The inner road auxiliary drainage pipe 12 should be installed in locations prone to poor drainage, such as areas with gentle longitudinal slopes or widened roads. The spacing between these pipes is determined based on the calculated runoff volume per unit road length. When the calculated runoff volume per unit road length is >1 L / (s·m), the recommended spacing is 25–50 m; when the calculated runoff volume per unit road length is ≤1 L / (s·m), the recommended spacing is 50–100 m. The specific spacing can be adjusted accordingly. The inlet of the inner road auxiliary drainage pipe 12 is flush with the asphalt pavement and is installed beside the lane marking 2 on the lower elevation side of the inner lane (or lane prone to water accumulation) of the widened road, avoiding wheel tracks. The outlet of the inner road auxiliary drainage pipe 12 connects to the roadside rainwater collection well 9.

[0044] The rainwater pipe 16 is located below the roadside rainwater collection well 9. The upper end of the rainwater pipe 16 connects to the bottom of the roadside rainwater collection well 9, and the lower end connects to the municipal drainage network. A siphon-type rainwater hopper 10 is installed at the interface between the roadside rainwater collection well 9 and the rainwater pipe 16. The siphon-type rainwater hopper 10 can be customized and adjusted according to the size of the collection well and the dimensions of the rainwater pipe 16 to ensure a tight seal between the bottom interface of the siphon-type rainwater hopper 10 and the rainwater pipe 16, using a waterproof sealing ring. The siphon-type rainwater hopper 10 is made of cast iron or stainless steel, possessing certain strength and waterproof properties. Specific requirements can be found in "CJT 245 Siphon Rainwater Hopper 2007".

[0045] The inner road auxiliary drainage pipe 12 consists of a vertical inlet pipe 3, a horizontal water conveyance pipe 4, a longitudinal siphon pipe 5, and a horizontal outlet pipe 6, all with gradually decreasing heights. The upper end of the vertical inlet pipe 3 (i.e., the inlet of the inner road auxiliary drainage pipe 12) is flush with the asphalt pavement, and its lower end connects to the horizontal water conveyance pipe 4. The other end of the horizontal water conveyance pipe 4 connects to the upper end of the longitudinal siphon pipe 5, and the lower end of the longitudinal siphon pipe 5 connects to the horizontal outlet pipe 6. The other end of the horizontal outlet pipe 6 is connected to the roadside rainwater collection well 9. The contact surface between the longitudinal siphon pipe 5 and the pavement structure is coated with acrylic waterproof sealant, and the joint between the horizontal outlet pipe 6 and the rainwater collection well wall 11 of the roadside rainwater collection well 9 is coated with acrylic waterproof sealant.

[0046] The inner road auxiliary drainage pipe 12 is a zigzag-shaped pipe with a square cross-section on the outer surface and a circular cross-section on the inner surface. The square cross-sections on the outer surfaces of the vertical inlet pipe 3, the transverse delivery pipe 4, the longitudinal siphon pipe 5, and the transverse outlet pipe 6 have a side length of 8cm, and the radius of their circular cross-sections on the inner surfaces is 2.5cm. The length of the vertical inlet pipe 3 is determined based on the thickness of the asphalt pavement surface layer. The length of the transverse delivery pipe 4 is determined based on the distance between the vertical inlet pipe 3 and the roadside rainwater collection well 9. The length of the longitudinal siphon pipe 5 is determined based on the distance between the transverse delivery pipe 4 and the bottom surface of the roadside rainwater collection well 9, and should be as long as possible. The length of the transverse outlet pipe 6 is determined based on the thickness of the rainwater collection well wall 11 of the roadside rainwater collection well 9.

[0047] A water inlet cover plate 1 is provided at the upper end of the vertical water inlet pipe 3. The water inlet cover plate 1 has rectangular perforated holes with rounded corners. The material of the water inlet cover plate 1 is UHPC high-performance concrete. The water inlet cover plate 1 is a square with a side length of 8cm and a thickness of 1.5cm. The rectangular perforated holes on the water inlet cover plate 1 are 2cm long, 0.5cm wide, and have a rounded corner radius of 0.1cm. A total of 6 rectangular perforated holes are provided, evenly distributed in the middle position of the water inlet cover plate 1.

[0048] The inner road auxiliary drainage pipe 12 is made of UHPC ultra-high performance concrete. Its material performance requirements are shown in Table 1. In order to ensure the mechanical properties of UHPC, the water-cement ratio is controlled between 0.16 and 0.18. The inner road auxiliary drainage pipe 12 adopts an integral prefabrication process, and the zigzag pipe is integrally cast in one mold.

[0049] Table 1 lists the performance requirements for UHPC material used in the inner side road auxiliary drainage pipes:

[0050] Performance indicators Technical Requirements 7-day compressive strength (MPa) ≥120 7-day flexural tensile strength (MPa) ≥15 Porosity (%) ≤5％

[0051] This invention also provides a construction method for the ultra-wide asphalt pavement UHPC siphon-assisted drainage system as described above, with different construction methods for new roads, road reconstruction and expansion, and road drainage renovation. Depending on the construction scenario, the method includes the following steps:

[0052] New road construction scenario:

[0053] (1) Determine the layout location and spacing of the inner road auxiliary drainage pipes: The inner road auxiliary drainage pipes 12 of the UHPC siphon auxiliary drainage system for ultra-wide asphalt pavements should be installed in sections of ultra-wide roads with gentle longitudinal slopes or widened roads that are prone to poor drainage. The upper end of the vertical inlet pipe 3 should be flush with the asphalt pavement and should be installed next to the lane marking 2 on the lower elevation side of the inner lane (or lane prone to water accumulation) of the ultra-wide pavement, avoiding the location of wheel tracks. The layout spacing of the inner road auxiliary drainage pipes is determined according to the following method:

[0054] Table 2. Spacing requirements for auxiliary drainage pipes on the inner side of the road.

[0055] Calculate stormwater runoff per unit route length (L / (s·m)) Layout spacing (m) ＞1 25～50 ≤1 50～100

[0056] The specific spacing in the table above can be adjusted according to factors such as the location of drainage project collection wells and observed rainwater flow. The rainwater runoff per unit route length in the table above is determined using the following formula:

[0057] Q=ψ×q×F / m

[0058] In the formula: Q is the calculated rainwater runoff, in L / s;

[0059] Ψ is the runoff coefficient, which is selected according to the road material; for asphalt concrete pavement, it can be taken as 0.7.

[0060] q represents the intensity of the rainstorm, in L / s·hm. 2 ;

[0061] F is the catchment area, hm 2 ;

[0062] m represents the total length of the route for setting up the UHPC siphon auxiliary drainage system.

[0063] (2) Construction of rainwater collection well wall and rainwater pipe: When constructing the rainwater collection well wall 11 and its reinforcement, the position of the horizontal outlet pipe 6 should be reserved, and the overall installation of the auxiliary drainage pipe on the inner side road should be ensured. The siphon rainwater hopper 10 should be installed at the interface between the bottom of the rainwater collection well and the rainwater pipe as required. The tail pipe 13, horizontal pipe 14 and vertical pipe 15 in the rainwater pipe 16 should be set. The length of each section of the pipe should be reasonably set according to the distance between the rainwater collection well and the municipal pipe network. The length of the tail pipe 13 and the vertical pipe 15 should be as long as possible.

[0064] (3) Waterproofing treatment of the top surface of the road base: After the road base is laid and compacted, the location of the inner road auxiliary drainage pipe is determined and marked according to the method in step (1). A waterproof geotextile 7 is laid on the top surface of the base directly below the inner road auxiliary drainage pipe 12. The size of the waterproof geotextile 7 should extend 20cm around the projection surface of the inner road auxiliary drainage pipe 12. For the location of the longitudinal siphon pipe 5, the road base structure is longitudinally trimmed and ground.

[0065] (4) Install the inner road auxiliary drainage pipe: Transport the prefabricated inner road auxiliary drainage pipe to the site, ensuring it remains intact during transport. Install the inner road auxiliary drainage pipe 12 according to the marked location. During installation, ensure that it is tightly fitted with the longitudinal siphon pipe 5 and the road structure. Apply acrylic waterproof sealant to the contact surface between the longitudinal siphon pipe 5 and the road base structure. In addition, ensure that the transverse outlet pipe 6 of the inner road auxiliary drainage pipe 12 is tightly fitted with the road structure and the rainwater collection well wall 11, and apply acrylic waterproof sealant to the joint.

[0066] (5) Asphalt pavement surface layer paving: The asphalt pavement surface layer is paved and compacted. The asphalt pavement surface layer above the auxiliary drainage pipe 12 on the inner side of the road should be compacted separately with small machinery to ensure that the drainage pipe is not damaged during the compaction process.

[0067] Construction scenes of road expansion and drainage system renovation:

[0068] (1) Determine the layout location and spacing of the inner road auxiliary drainage pipes: The inner road auxiliary drainage pipes of the UHPC siphon auxiliary drainage system for ultra-wide asphalt pavement should be installed in sections of ultra-wide roads with gentle longitudinal slopes and widened roads that are prone to poor drainage. The upper end of the vertical inlet pipe 3 should be flush with the asphalt pavement and should be installed next to the lane marking 2 on the lower side of the inner lane (or lane prone to water accumulation) of the ultra-wide pavement, avoiding the location of wheel tracks. The layout spacing is determined according to step (1) of the new road construction scenario. The specific location and construction scope of the inner road auxiliary drainage pipe 11 are then marked on the road surface.

[0069] (2) Asphalt pavement milling: Cold milling of the upper, middle and lower layers of the asphalt pavement within the range of the inner road auxiliary drainage pipe. The milling range should be sufficient to lay waterproof geotextile 7 and install the inner road auxiliary drainage pipe 12.

[0070] (3) Partial removal of rainwater collection well walls: For the collection wells corresponding to the auxiliary drainage pipes on the inner road, the well walls on the side closest to the drainage pipes shall be partially removed. The removal height shall be up to the position of the horizontal outlet pipe 6.

[0071] (4) Waterproofing treatment of the top surface of the road base: The treatment shall be carried out in accordance with the method described in step (3) of the new road construction scenario.

[0072] (5) Install auxiliary drainage pipes on the inner side of the road: Follow the steps (4) of the new road construction scenario to process the pipes.

[0073] (6) Repair of the water collection well wall and backfilling of the asphalt pavement surface: The water collection well wall is repaired and reinforced as required above the transverse water outlet pipe 6. The asphalt pavement surface is laid according to step (5) of the new road construction scenario.

[0074] Example 1:

[0075] In this embodiment of the invention, the project is an urban arterial road with ten lanes in both directions, a total length of approximately 2.5 km, and a design speed of 60 km / h. According to the road engineering design data for this project, the ultra-wide asphalt pavement UHPC siphon-assisted drainage system of this invention is located on a section with a longitudinal slope of 0.3% and a length of approximately 300 m.

[0076] The inner road auxiliary drainage pipe 12 is installed in locations prone to poor drainage, such as areas with gentle longitudinal slopes on extra-wide roads and widened roads. The spacing between these pipes is determined based on the calculated stormwater runoff per unit road length. When the calculated runoff per unit road length > 1 L / (s·m), the spacing is 25–50 m; when the calculated runoff per unit road length ≤ 1 L / (s·m), the spacing is 50–100 m. Based on the road section's drainage conditions, the calculated stormwater runoff per unit road length for this section is 1.08 L / (s·m). Considering the roadside stormwater collection wells, the spacing for the UHPC siphon auxiliary drainage system is determined to be 40 m. The upper end of the vertical inlet pipe 3 is located next to lane marking 2 on the lower elevation side of the second lane, with separate pipes installed for each of the two driving lanes.

[0077] In this embodiment of the invention, the road structure layer is configured as follows: 4cm AC-13C (modified) + 6cm AC-20C (modified) + 8cm AC-25C + 0.8cm synchronous crushed stone seal layer and prime coat + 18cm 5% cement-stabilized graded crushed stone + 18cm 5% cement-stabilized graded crushed stone + 18cm 4% cement-stabilized graded crushed stone + 15cm unscreened crushed stone.

[0078] In this embodiment of the invention, the inner road auxiliary drainage pipe 12 is entirely prefabricated in a factory, and the material used is UHPC high-performance concrete. Its mix proportions are shown in the table below, with a water-cement ratio of 0.178.

[0079] Table 4 shows the mix proportions of ultra-high performance concrete (UHPC) in Example 1.

[0080]

[0081] After mixing and molding, 100*100*100mm specimens were prepared and tested for 7-day unconfined compressive strength, which yielded a result of 140MPa; 100*100*100mm specimens were prepared and tested for 7-day flexural tensile strength, which yielded a result of 18.5MPa; the porosity was 4.85%, which meets the relevant requirements for material mechanical properties.

[0082] In this embodiment of the invention, the vertical inlet pipe 3 of the inner road auxiliary drainage pipe 12 is 18cm long, based on the thickness of the pavement structure layer (asphalt pavement surface layer); the transverse water supply pipe 4 is the distance from the vertical inlet pipe 3 to the roadside rainwater collection well 9, which is approximately 10m. The length of the longitudinal siphon pipe 5 is determined to be 40cm, taking into account the depth of the rainwater collection well and construction conditions, and the length of the transverse outlet pipe 6 is 15cm, based on the thickness of the rainwater collection well wall 11.

[0083] The prefabricated inner road auxiliary drainage pipe 12 is protected from transportation damage by using sponge pads for shock absorption and steel ropes for fixation.

[0084] First, construct the road base layer and roadside stormwater collection wells according to the requirements. The side wall of the roadside stormwater collection well 9 should have reserved installation space according to the diameter of the inner auxiliary drainage pipe 12. After the road base layer is completed and cured to meet the requirements for the surface layer overlay, install the inner road auxiliary drainage pipe 12 in place, forming a complete UHPC siphon-type auxiliary drainage system together with the roadside stormwater collection well 9 and stormwater pipe 16.

[0085] During installation, some locations should be treated according to the construction scenario of a newly built road. It should be noted that the road base at the location of the inner auxiliary drainage pipe 12 should be covered with waterproof geotextile 7 of the corresponding area. The contact surfaces between the inlet pipe cover plate 1 and the vertical inlet pipe 3, the longitudinal siphon pipe 5 and the side of the road base structure, and the contact surfaces between the transverse outlet pipe 4 and the rainwater collection well wall 11 should all be coated with acrylic waterproof sealant.

[0086] According to the design, the diameter of the rainwater pipe 16 is determined to be 600mm. In this embodiment, the pipe diameter is customized using cast iron material to ensure that its lower end structure fits tightly with the rainwater pipe 16.

[0087] By altering the drainage path of surface water on the inner side of the ultra-wide road, it has been demonstrated that this can reduce rainwater deposition in the cracks of the outer road surface, accelerate rainwater drainage, improve the anti-skid performance of the road surface, and ensure vehicle driving safety. This auxiliary drainage system has significant application value.

[0088] Example 2:

[0089] In Embodiment 2 of the present invention, a construction scheme for road drainage reconstruction is provided:

[0090] Based on the operational status of a certain road over many years, several sections were identified as being highly prone to water accumulation and slippery conditions. These sections were then modified using the auxiliary drainage system provided by this invention, including the following steps:

[0091] (1) Determine the location and spacing of the auxiliary drainage pipes on the inner side of the road: Based on the surface water monitoring and road operation, the spacing of the auxiliary drainage pipes 12 on the inner side of the road prone to water accumulation is determined to be 30m. The vertical inlet pipe 3 is located next to lane marking 2 on the side of the second lane with the lower elevation, and separate pipes are installed for the two driving lanes. Determine the station number of the installation location and mark it on the existing road surface.

[0092] (2) Asphalt pavement milling: Cold milling is performed on the upper, middle, and lower layers of the asphalt pavement within the range of the inner road auxiliary drainage pipe. In this embodiment, the vertical inlet pipe 3 of the inner road auxiliary drainage pipe 12 is 18cm long based on the thickness of the pavement structure layer (asphalt pavement surface layer); the transverse water delivery pipe 4 is the distance from the vertical inlet pipe 3 to the roadside rainwater collection well 9, which is approximately 9.5m. The longitudinal siphon pipe is 40cm long based on the depth of the rainwater collection well and construction conditions, and the length of the transverse outlet pipe 6 is 15cm long based on the thickness of the rainwater collection well wall 11. Therefore, the milled area is 11.5 * 0.5 = 5.75m². 2 The surface is milled in layers, with the milled area gradually increasing from bottom to top. After milling, the road surface has a stepped shape, which ensures that there is interlayer interaction between different surface layers after backfilling, and that it is not easy for defects to occur at the backfill interface.

[0093] (3) Partial demolition of rainwater collection well walls: For the collection wells corresponding to the auxiliary drainage pipes on the inner road, the well walls on the side closest to the drainage pipes will be partially demolished. The demolition height will be up to the position of the horizontal outlet pipe 6.

[0094] (4) Waterproofing treatment of the top surface of the road base: A waterproof geotextile 7 is laid on the top surface of the base directly below the inner road auxiliary drainage pipe 12. The size of the waterproof geotextile 7 should extend 20cm around the projection surface of the inner road auxiliary drainage pipe 12. In addition, ensure that the longitudinal siphon pipe 5 is tightly attached to the road base structure and apply acrylic waterproof sealant to the attachment area.

[0095] (5) Installation: Install the inner road auxiliary drainage pipe 12 into place, forming a complete UHPC siphon auxiliary drainage system with the roadside rainwater collection well 9 and rainwater pipe 16. In this embodiment of the invention, some locations are treated according to the construction scenario of road reconstruction and drainage renovation during the installation process. It should be noted that the road base layer at the location of the inner auxiliary drainage pipe 12 should be covered with waterproof geotextile 7 of the corresponding area. The contact surfaces between the inlet pipe cover plate 1 and the vertical inlet pipe 3, the longitudinal siphon pipe 5 and the side of the road base structure, and the contact surfaces between the transverse outlet pipe 6 and the rainwater collection well wall 11 are all coated with acrylic waterproof sealant.

[0096] (6) Repair of the sump wall and backfilling of the asphalt pavement: The sump wall above the transverse outlet pipe 6 shall be repaired and reinforced as required. The asphalt pavement above the inner road auxiliary drainage pipe 12 shall be compacted separately with small machinery to ensure that the drainage pipe is not damaged during the compaction process.

[0097] To address the issues of water accumulation on inner roads and slippery surfaces caused by thick water films, the auxiliary drainage system provided by this invention offers the following advantages for optimizing road drainage:

[0098] 1. Lower cost: The auxiliary drainage system provided by this invention is added to the asphalt pavement surface layer structure. It is based on the existing rainwater well facilities and municipal pipe network. The inner auxiliary drainage pipe has a small structure, consumes less material, and has a low cost. Moreover, the milling area is small during construction, and there is no need to demolish and rebuild the existing pipe network. The overall cost is lower than that of traditional pipeline renovation.

[0099] 2. Short renovation time, completed and open to traffic on the same day: Since all new structures in this invention are prefabricated in the project, they do not affect the operation of vehicles on site. Moreover, the construction process of installing the inner road auxiliary drainage pipe of this invention is simple and fast, the road backfill area is small, and a certain number of lanes are reserved for traffic maintenance, without affecting traffic operation.

[0100] 3. It fundamentally solves the problem of poor drainage in the inner lane by addressing the drainage path, reducing the formation of water film on the road surface, and improving road driving safety.

[0101] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any transformations or substitutions that can be understood by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of the present invention.

Claims

1. A UHPC siphon-type auxiliary drainage system for ultra-wide asphalt pavement, characterized in that, The system includes an inner road auxiliary drainage pipe (12), a roadside rainwater collection well (9), and a rainwater pipe (16). The inner road auxiliary drainage pipe (12) is installed inside the asphalt pavement surface layer and above the top surface of the pavement base layer. The inlet of the inner road auxiliary drainage pipe (12) is flush with the asphalt pavement and is located next to the lane marking (2) on the lower side of the inner lane of the extra-wide road. The outlet of the inner road auxiliary drainage pipe (12) is connected to the roadside rainwater collection well (9). The rainwater pipe (16) is located below the roadside rainwater collection well (9). The upper end of the rainwater pipe (16) is connected to the bottom surface of the roadside rainwater collection well (9), and its lower end is connected to the municipal drainage network. A siphon rainwater bucket (10) is installed at the interface between the roadside rainwater collection well (9) and the rainwater pipe (16). The inner road auxiliary drainage pipe (12) consists of a series of pipes with different heights. The system consists of a vertical inlet pipe (3), a horizontal water conveyance pipe (4), a longitudinal siphon pipe (5), and a horizontal outlet pipe (6), all of which gradually decrease in height. The upper end of the vertical inlet pipe (3) is flush with the asphalt pavement, and its lower end is connected to the horizontal water conveyance pipe (4). The other end of the horizontal water conveyance pipe (4) is connected to the upper end of the longitudinal siphon pipe (5), and the lower end of the longitudinal siphon pipe (5) is connected to the horizontal outlet pipe (6). The other end of the horizontal outlet pipe (6) is connected to the roadside rainwater collection well (9). The rainwater pipe (16) consists of a tail pipe (13), a horizontal pipe (14), and a riser pipe (15), all of which gradually decrease in height. The upper end of the tail pipe (13) is connected to the bottom surface of the roadside rainwater collection well (9), and its lower end is connected to the horizontal pipe (14). The other end of the horizontal pipe (14) is connected to the upper end of the riser pipe (15), and the lower end of the riser pipe (15) is connected to the municipal drainage network.

2. The UHPC siphon-type auxiliary drainage system for ultra-wide asphalt pavement according to claim 1, characterized in that, The inner road auxiliary drainage pipe (12) is a zigzag pipe with a square cross-section on the outer surface and a circular cross-section on the inner surface. The square cross-section on the outer surface of the vertical water inlet pipe (3), the horizontal water conveyance pipe (4), the longitudinal siphon pipe (5), and the horizontal water outlet pipe (6) has a side length of 8cm and a radius of 2.5cm for the circular cross-section on the inner surface.

3. The UHPC siphon-type auxiliary drainage system for ultra-wide asphalt pavement according to claim 1, characterized in that, The length of the vertical inlet pipe (3) is determined based on the thickness of the asphalt pavement surface layer structure. The length of the transverse water supply pipe (4) is determined based on the distance between the vertical inlet pipe (3) and the roadside rainwater collection well (9). The length of the longitudinal siphon pipe (5) is determined based on the distance between the transverse water supply pipe (4) and the bottom surface of the roadside rainwater collection well (9). The length of the transverse outlet pipe (6) is determined based on the thickness of the rainwater collection well wall (11) of the roadside rainwater collection well (9).

4. The UHPC siphon-type auxiliary drainage system for ultra-wide asphalt pavement according to claim 1, characterized in that, The upper end of the vertical water inlet pipe (3) is provided with a water inlet pipe cover plate (1), and the water inlet pipe cover plate (1) is provided with rectangular hollow holes with rounded corners; the material of the water inlet pipe cover plate (1) is UHPC high-performance concrete; the water inlet pipe cover plate (1) is a square with a side length of 8cm and a thickness of 1.5cm. The rectangular hollow holes on the water inlet pipe cover plate (1) are 2cm long, 0.5cm wide, and have a rounded corner radius of 0.1cm. A total of 6 rectangular hollow holes are provided, which are evenly distributed in the middle position of the water inlet pipe cover plate (1).

5. The UHPC siphon-type auxiliary drainage system for ultra-wide asphalt pavement according to claim 1, characterized in that, The inner road auxiliary drainage pipe (12) is made of UHPC ultra-high performance concrete, and the water-cement ratio should be controlled between 0.16 and 0.

18. The zigzag pipe is integrally cast in one mold.

6. The UHPC siphon-type auxiliary drainage system for ultra-wide asphalt pavement according to claim 1, characterized in that, The bottom interface of the siphon rainwater hopper (10) is sealed to the rainwater pipe (16) and sealed with a waterproof sealing ring. The material of the siphon rainwater hopper (10) is cast iron or stainless steel.

7. A construction method for an ultra-wide asphalt pavement UHPC siphon-assisted drainage system based on any one of claims 1 to 6, characterized in that, Depending on the construction scenario, the following steps are included: New road construction scenario: S10, Determine the layout location and spacing of the inner road auxiliary drainage pipe: The inner road auxiliary drainage pipe (12) of the UHPC siphon auxiliary drainage system for ultra-wide asphalt pavement is set in the section of the ultra-wide road with a gentle longitudinal slope and where poor drainage is likely to occur when the road is widened; the upper end of the vertical water inlet pipe (3) is flush with the asphalt pavement and is set next to the lane marking (2) on the side of the inner lane with a lower elevation of the ultra-wide pavement, avoiding the position of the wheel track. S11. Construction of rainwater collection well wall and rainwater pipe: When constructing the rainwater collection well wall (11) and its reinforcement, reserve the position of the horizontal outlet pipe (6); install the siphon rainwater hopper (10) at the interface between the bottom of the roadside rainwater collection well (9) and the rainwater pipe (16) as required; set the tail pipe (13), horizontal pipe (14) and vertical pipe (15) in the rainwater pipe (16), and set the length of each section of pipe reasonably according to the distance between the rainwater collection well and the municipal pipe network. The length of the tail pipe (13) and the vertical pipe (15) should be as long as possible; S12. Waterproofing treatment of the top surface of the road base: After the road base is laid and compacted, determine the position of the inner road auxiliary drainage pipe and mark it according to the method of step S10. Lay waterproof geotextile (7) directly below the inner road auxiliary drainage pipe (12). The size should extend 20cm around the projection surface of the inner road auxiliary drainage pipe (12); S13, Install the inner road auxiliary drainage pipe: Transport the prefabricated inner road auxiliary drainage pipe (12) to the site, ensuring that it is intact during the transportation process; Install according to the marked position, ensuring that the road structure and the longitudinal siphon pipe (5) are tightly fitted during installation, and apply acrylic waterproof sealant to the contact surface; Ensure that the transverse outlet pipe (6) is tightly fitted to the rainwater collection well wall (11) during installation, and apply acrylic waterproof sealant to the joint; S14, Pave the asphalt pavement surface layer: Spread and compact the asphalt pavement surface layer, and compact the asphalt pavement surface layer above the inner road auxiliary drainage pipe (12) separately with small machinery to ensure that the drainage pipe is not damaged during the compaction process; Construction scenario for road expansion and drainage renovation: S15. Determine the layout location and spacing of the inner road auxiliary drainage pipe (12) according to the requirements of step S10. Mark the road surface after determining the specific location and construction scope; S16. Pre-treatment of existing road surface, roadside rainwater collection well (9), and rainwater pipe (16): Cold mill the upper, middle and lower layers of asphalt pavement within the construction scope of the inner road auxiliary drainage pipe (12); For the roadside rainwater collection well (9) corresponding to the inner road auxiliary drainage pipe (12), partially demolish the rainwater collection well wall (11) on the side close to the drainage pipe, and reserve the position of the transverse outlet pipe (6); Modify the existing rainwater pipe that does not meet the requirements to ensure that it is connected to the tail pipe. (13) Composed of horizontal pipe (14) and vertical pipe (15), the length of each section of pipe is reasonably set according to the distance between the rainwater collection well and the municipal pipe network. The length of the tail pipe (13) and vertical pipe (15) should be as long as possible. After the renovation is completed, install the siphon rainwater bucket (10); S17, Waterproofing treatment of the top surface of the road base and installation of auxiliary drainage pipes on the inner side of the road: The treatment is carried out according to the method described in steps S12 and S13 of the new road construction scenario; S18, Repair of the collection well wall and backfilling of the asphalt pavement surface layer: The rainwater collection well wall (11) is poured, repaired and reinforced above the horizontal water outlet pipe (6) as required. The asphalt pavement surface layer is backfilled and paved according to step S14 of the new road construction scenario.

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