Pervious concrete rain drainage facility combined construction device and method

Abstract

The invention relates to the technical field of roadway construction, in particular to a pervious concrete rain drainage facility combined construction device and method. According to the technical scheme, the device comprises a driving machine and a road roller at the front end of the driving machine, wherein a trench excavation machine and a hopper are detachably mounted at the rear end of the driving machine; an auger blade and a stirring shaft are arranged in the hopper, and an adjustable moving mechanism and a flattening mechanism are installed at the bottom of the hopper through a bottom frame. The auger blade drives the feeding pipe and the blanking spray head to swing back and forth through bevel gear transmission and a bidirectional screw rod to uniformly distribute materials; the flattening mechanism is provided with a pressing roller with an eccentric wheel, and vibration compaction can be achieved. The method comprises the steps of foundation soil compaction, blind ditch construction, gravel subbase layer laying, pervious concrete base layer vibration compaction, maintenance and pervious surface layer laying. Multiple permeable structure layers are laid through one machine, material distribution is uniform, compaction is controllable, the permeable porosity is effectively kept, and the rainwater collection efficiency and the construction quality are improved.

Description

Technical Field

[0001] This invention relates to the field of tunnel construction technology, and in particular to a combined construction device and method for permeable concrete rainwater drainage facilities. Background Technology

[0002] In recent years, with the deepening of sponge city construction, permeable concrete pavement, as an ecological paving technology that enables natural rainwater infiltration, storage, and purification, has been widely used in urban renewal and renovation of old residential areas. Permeable concrete pavement, through its porous structure, allows rainwater to infiltrate into the ground, while combined with drainage facilities such as blind drains to collect excess rainwater, thus realizing the resource utilization of rainwater.

[0003] Currently, the construction of permeable concrete pavements mainly adopts a phased operation method. Subgrade treatment, blind ditch excavation, crushed stone layer laying, and permeable concrete pouring are all completed by different machines, requiring multiple machine entries and exits between each process, resulting in complex construction organization. Existing paving equipment is mostly designed for ordinary concrete, and its vibration compaction method can easily cause cement slurry in the permeable concrete to settle and clog the bottom pores, compromising permeability. Furthermore, traditional fixed-feeding methods easily cause material segregation and uneven thickness, affecting pavement permeability and service life.

[0004] However, existing construction machinery cannot simultaneously ensure uniformity of material distribution and controllable compaction during the laying of permeable concrete pavement. It is also unable to effectively maintain the interconnected porosity of permeable concrete while ensuring structural strength, resulting in reduced rainwater collection efficiency and affecting the construction effect of sponge cities. Therefore, this application proposes a combined construction device and method for permeable concrete rainwater drainage facilities. Summary of the Invention

[0005] The purpose of this invention is to address the problem in the prior art that it is difficult to effectively maintain the interconnected porosity of permeable concrete, which leads to a decrease in rainwater collection efficiency and affects the construction effect of sponge cities. The invention proposes a combined construction device and method for permeable concrete rainwater drainage facilities.

[0006] In a first aspect, the present invention provides a combined construction device for permeable concrete rainwater drainage facilities, including a drive motor and a road roller installed at the front end of the drive motor, and further comprising: The trench excavator and hopper are detachably installed at the rear end of the drive motor. An auger blade is rotatably installed on the lower side inside the hopper. The front end of the auger blade is connected to the output shaft of the drive motor, and a bevel gear is installed at the rear end. The construction device also includes a laying mechanism installed at the bottom of the hopper. The laying mechanism is installed at the bottom of the hopper via a base frame, and adjustable moving mechanisms are installed on both sides of the outer wall of the base frame. A leveling mechanism is installed on the rear side of the outer wall. A protective cover is installed on the outer side of the first bevel gear, and a drive shaft is rotatably installed on one side inside the protective cover. A second bevel gear is installed at one end of the drive shaft, and the first bevel gear meshes with the second bevel gear. A bidirectional screw is rotatably installed inside the base frame, and the second bevel gear is connected to the end of the bidirectional screw via a transmission belt mechanism. A threaded sleeve is threadedly connected to the outer wall of the bidirectional screw, and an L-shaped connecting rod is installed on one side of the outer wall of the threaded sleeve. A fixing sleeve is installed at one end of the L-shaped connecting rod, and a feeding pipe is installed on the inner wall of the fixing sleeve. One end of the feeding pipe is connected to one side of the bottom of the hopper for conveying crushed stone, concrete, etc., and a discharge nozzle is installed at the other end of the feeding pipe.

[0007] Optionally, a drive wheel is installed on the outer wall of the auger blade near the drive motor, and two driven wheels are rotatably arranged inside the hopper near the auger blade. The two driven wheels are respectively meshed on both sides of the outer wall of the drive wheel, and a stirring shaft is fixedly arranged inside the driven wheel.

[0008] Optionally, the stirring shaft is rotatably mounted on the inner wall of the hopper, and materials such as crushed stone and concrete can be placed inside the hopper.

[0009] Optionally, the adjustable moving mechanism is installed on both sides of the outer wall of the base frame via fixed columns, and a sliding column is slidably arranged inside the fixed column. A bearing seat is installed at the bottom of the sliding column, and a moving wheel is installed inside the bearing seat.

[0010] Optionally, a lead screw is rotatably installed inside the fixed column, and a handle is installed on the top of the lead screw.

[0011] Optionally, the sliding column has an internal thread inside, and the internal thread matches the outer wall of the lead screw.

[0012] Optionally, the leveling mechanism is installed on the rear side of the outer wall of the base frame via a support column, and a pivot seat is provided at both ends of the support column. One of the pivot seats is installed on the rear side of the outer wall of the base frame, and the other pivot seat is equipped with a fixing plate. A push plate is installed on the outer wall of the fixing plate near the base frame, and a pressure plate is installed at the bottom of the fixing plate.

[0013] Optionally, multiple pressure rollers are rotatably arranged inside the fixed plate, and the outer walls of the multiple pressure rollers are rotatably arranged inside the pressure plate.

[0014] Optionally, eccentric wheels are installed at both ends of the pressure roller, and the eccentric wheels are slidably disposed inside the fixed plate.

[0015] Secondly, the present invention provides a method for constructing a permeable concrete stormwater drainage system, applied to the permeable concrete stormwater drainage system construction device described in the first aspect, the method comprising the following steps: S1. Use a road roller at the front of the drive unit to level and compact the roadbed soil; install a trench excavator at the rear of the drive unit to excavate longitudinal trenches on both sides of the compacted soil, bury semi-circular PVC pipes in the trenches, fill the pipes with gravel to form blind drains, and convert the ends of the semi-circular PVC pipes into full-circular pipes to extend into the rainwater wells. S2. Dismantle the trench excavator, install the hopper and laying mechanism at the rear of the drive machine, and adjust the adjustable moving mechanism to raise and lower the base frame, controlling the distance between the material nozzle and the base surface to make it conform to the design thickness of the structural layer to be laid. S3. The crushed stone is evenly sprayed onto the base surface through the paving mechanism, and then leveled and compacted by the leveling mechanism as the drive machine moves forward, forming a permeable base layer with a thickness of 150~200mm; the material in the hopper is replaced with permeable concrete with a strength grade of not less than C30, and then evenly sprayed onto the crushed stone base layer through the paving mechanism, and then vibrated and compacted by the leveling mechanism as the drive machine moves forward, forming a permeable base layer. S4. Cover and moisturize the completed permeable base layer for no less than 7 days. After the curing is completed, replace the material in the hopper with permeable mortar, lay a 20-40mm thick permeable mortar bonding layer on the permeable base layer, and then lay permeable bricks to form a permeable surface layer. S5. A circular pipe extending from the blind drain into the rainwater well will collect the rainwater that has seeped into the blind drain into the city's stormwater drainage system.

[0016] Compared with the prior art, this application includes at least one of the following beneficial technical effects: This invention utilizes the synergistic effect of blind drains and permeable structural layers to allow rainwater from the road surface to infiltrate layer by layer through the permeable surface layer, permeable base layer, and crushed stone subbase layer before flowing into the blind drains on both sides and finally into the urban stormwater drainage system. This significantly increases the rainwater collection area and infiltration path, effectively improves the rainwater collection and utilization rate, and reduces urban flooding during the rainy season.

[0017] Furthermore, a pressure roller with an eccentric wheel is set in the leveling mechanism. Through periodic vibration, the cement slurry is evenly coated with the aggregate and point contact is formed between the aggregates. This not only ensures the strength of the concrete, but also avoids the problem of cement slurry settling and clogging the bottom pores caused by traditional vibration methods, effectively preserving the interconnected porosity of the permeable concrete.

[0018] Finally, by combining the auger blades with the reciprocating feeding nozzles, the material is evenly sprayed along the width of the tunnel, avoiding the material accumulation and segregation caused by traditional fixed feeding. The adjustable moving mechanism can precisely control the laying thickness, and one machine can complete the laying of multiple structural layers, greatly improving construction efficiency. Attached Figure Description

[0019] Figure 1 A schematic diagram of the overall structure of a permeable concrete rainwater drainage facility combined construction device; Figure 2 A schematic diagram of the hopper structure of a combined construction device for permeable concrete rainwater drainage facilities; Figure 3 A schematic diagram of the internal structure of the hopper in a combined construction device for permeable concrete rainwater drainage facilities; Figure 4 A schematic diagram of the internal structure of the base frame of a permeable concrete rainwater drainage facility combined construction device; Figure 5 A schematic diagram of a fixed plate structure for a permeable concrete rainwater drainage facility combined construction device; Figure 6 A schematic diagram of the internal structure of a fixed column in a permeable concrete rainwater drainage facility combined construction device. Figure 7 for Figure 4 Schematic diagram of the structure at point A in the middle; Figure 8 This is a flowchart of a combined construction method for permeable concrete rainwater drainage facilities.

[0020] Reference numerals: 1. Drive motor; 2. Road roller; 3. Trench excavator; 4. Hopper; 5. Base frame; 6. Adjustable moving mechanism; 7. Leveling mechanism; 8. Screw blade; 9. Drive wheel; 10. Driven wheel; 11. Mixing shaft; 12. Feed pipe; 13. Discharge nozzle; 14. Bevel gear one; 15. Bevel gear two; 16. Transmission belt mechanism; 17. Double-acting screw; 18. Threaded sleeve; 19. Fixed sleeve; 20. L-shaped connecting rod; 21. Protective cover; 22. Support column; 23. Rotary shaft seat; 24. Fixed plate; 25. Push plate; 26. Pressure plate; 27. Pressure roller; 28. Eccentric wheel; 29. ​​Fixed column; 30. Lead screw; 31. Handle; 32. Sliding column; 33. Bearing seat; 34. Moving wheel; 35. Drive shaft. Detailed Implementation

[0021] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other. Example

[0022] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 7 As shown, the present invention proposes a permeable concrete rainwater drainage facility combined construction device, including a drive machine 1, a road roller 2 and a laying mechanism set at the bottom of the hopper 4; a trench excavator 3 and the hopper 4 are detachably installed at the rear end of the drive machine 1, and an auger blade 8 is rotatably arranged on the lower side inside the hopper 4, and the front end of the auger blade 8 is connected to the output shaft of the drive machine 1, and a bevel gear 14 is installed at the rear end; The laying mechanism is mounted on the bottom of the hopper 4 via a base frame 5. Adjustable moving mechanisms 6 are installed on both sides of the outer wall of the base frame 5, and a leveling mechanism 7 is installed on the rear side of the outer wall. A protective cover 21 is installed on the outside of the first bevel gear 14, and a drive shaft 35 is rotatably mounted on one side inside the protective cover 21. A second bevel gear 15 is mounted on one end of the drive shaft 35, and the first bevel gear 14 meshes with the second bevel gear 15. A bidirectional screw 17 is rotatably mounted inside the base frame 5. The bevel gear 15 is connected to the end of the bidirectional screw 17 via a transmission belt mechanism 16. The outer wall of the bidirectional screw 17 is threaded with a threaded sleeve 18. An L-shaped connecting rod 20 is installed on one side of the outer wall of the threaded sleeve 18. A fixing sleeve 19 is installed at one end of the L-shaped connecting rod 20. A feeding pipe 12 is installed on the inner wall of the fixing sleeve 19. One end of the feeding pipe 12 is connected to one side of the bottom of the hopper 4 for conveying crushed stone, concrete, etc. The other end of the feeding pipe 12 is equipped with a discharge nozzle 13. In this embodiment, a drive wheel 9 is installed on the outer wall of the auger blade 8 near the drive motor 1. Two driven wheels 10 are rotatably arranged inside the hopper 4 near the auger blade 8, and the two driven wheels 10 are respectively meshed on both sides of the outer wall of the drive wheel 9. A stirring shaft 11 is fixedly arranged inside the driven wheel 10. The stirring shaft 11 is rotatably arranged on the inner wall of the hopper 4. The hopper 4 can be filled with materials such as crushed stone and concrete. The laying mechanism is described in detail below: In this embodiment, during operation, the operator first starts the drive motor 1. The road roller 2 at the front end of the drive motor 1 levels and compacts the roadway foundation soil. At the same time, the power output shaft at the rear end of the drive motor 1 starts to operate. This output shaft is connected to the front end of the auger blade 8 on the lower side inside the hopper 4, driving the auger blade 8 to rotate. The auger blade 8 itself performs preliminary agitation on the material (such as crushed stone, permeable concrete, etc.) at the bottom of the hopper 4 to prevent the material from caking and ensure its good fluidity and smooth discharge. The auger blade 8 can also push the material to one side of the hopper 4, so that the material falls into the feed pipe 12. Secondly, the rotation of the auger blade 8 drives the drive wheel 9 on the outer wall to rotate accordingly. The drive wheel 9 and the two driven wheels 10 meshing with the two sides of its outer wall drive the mixing shaft 11 to rotate synchronously inside the hopper 4, thereby fully agitating the material in the hopper 4, ensuring the uniformity of the material, and ensuring the gradation and permeability of the permeable concrete.

[0023] While the auger blade 8 rotates to convey materials, the bevel gear 14 installed at its rear end rotates synchronously. The bevel gear 14 meshes with the bevel gear 15 at the end of the drive shaft 35 inside the protective cover 21, transmitting power from the auger blade 8 to the drive shaft 35. The other end of the drive shaft 35 is connected to the end of the bidirectional screw 17, which is rotatably installed inside the base frame 5, via a transmission belt mechanism 16. When the drive shaft 35 rotates, it drives the bidirectional screw 17 to rotate within the base frame 5 via the transmission belt mechanism 16. A threaded sleeve 18 is threadedly connected to the outer wall of the bidirectional screw 17. When the bidirectional screw 17 rotates, the threaded sleeve 18 reciprocates on the bidirectional screw 17. The threaded sleeve 18 is connected to the fixed sleeve 19 via an L-shaped connecting rod 20. A feeding pipe 12 is installed on the inner wall of the fixed sleeve 19. As the threaded sleeve 18 reciprocates, the feeding pipe 12 and its lower end discharge nozzle 13 reciprocate along the width of the tunnel below the base frame 5. The material in the hopper 4 is pushed into the feeding pipe 12 by the screw conveyor blade 8, and finally sprayed evenly on the roadway base surface from the reciprocating oscillating discharge nozzle 13, realizing the uniform laying of permeable material and effectively avoiding the material accumulation or segregation caused by traditional fixed discharge. Example

[0024] like Figure 1 , Figure 2 , Figure 3 and Figure 6 As shown, based on Embodiment 1, the construction device further includes an adjustable moving mechanism 6; the adjustable moving mechanism 6 is installed on both sides of the outer wall of the base frame 5 via fixed columns 29, and a sliding column 32 is slidably arranged inside the fixed column 29, a bearing seat 33 is installed at the bottom of the sliding column 32, and a moving wheel 34 is installed inside the bearing seat 33; a lead screw 30 is rotatably arranged inside the fixed column 29, and a handle 31 is installed at the top of the lead screw 30; the sliding column 32 has an internal thread, and the internal thread matches the outer wall of the lead screw 30. The adjustable moving mechanism 6 is described in detail below: In this embodiment, before or during the laying operation, the operator can adjust the height of the base frame 5 according to the construction design requirements (such as the thickness of the crushed stone layer, the thickness of the permeable concrete layer, etc.). The adjustable moving mechanism 6 is fixedly installed on both sides of the outer wall of the base frame 5 via fixed columns 29. A lead screw 30 is vertically rotatably installed inside the fixed column 29, and a handle 31 is installed on the top of the lead screw 30. A sliding column 32 is slidably installed inside the fixed column 29, and the sliding column 32 has an internal thread that matches the external thread of the lead screw 30, thus forming a lead screw and nut pair. A bearing seat 33 is installed at the bottom of the sliding column 32, and the moving wheel 34 is rotatably installed inside the bearing seat 33 via the bearing.

[0025] When the height of the base frame 5 needs to be adjusted, the operator rotates the handle 31, which drives the lead screw 30 to rotate within the fixed column 29. Since the sliding column 32 engages with the lead screw 30 via an internal thread, and is confined within the fixed column 29, it can only slide up and down and cannot rotate. Therefore, the rotational motion of the lead screw 30 is converted into the linear lifting motion of the sliding column 32. The sliding column 32 drives the moving wheel 34 to move up and down relative to the fixed column 29 via the bearing seat 33. Because the moving wheel 34 is supported on the ground, the fixed column 29 and its connected base frame 5 rise and fall in the opposite direction. By synchronously adjusting the handles 31 on both sides, the height of the base frame 5 above the ground can be precisely controlled, thereby controlling the distance between the material nozzle 13 and the paving surface, as well as the pressing depth of the subsequent leveling mechanism 7. This ensures the flatness and thickness consistency of the permeable structure layer, ensuring that the laid material reaches the designed thickness without damaging the permeable pore structure due to improper height. Example

[0026] like Figure 1 , Figure 2 , Figure 3 and Figure 5 As shown, based on embodiments 1 and 2, the construction device further includes a leveling mechanism 7. The leveling mechanism 7 is installed on the rear side of the outer wall of the base frame 5 via a support column 22, and both ends of the support column 22 are provided with a pivot seat 23. One of the pivot seats 23 is installed on the rear side of the outer wall of the base frame 5, and the other pivot seat 23 is equipped with a fixing plate 24. A push plate 25 is installed on the outer wall of the fixing plate 24 near the base frame 5, and a pressure plate 26 is installed at the bottom of the fixing plate 24. Multiple pressure rollers 27 are rotatably arranged inside the fixing plate 24, and the outer walls of the multiple pressure rollers 27 are rotatably arranged inside the pressure plate 26. Eccentric wheels 28 are installed at both ends of the pressure rollers 27, and the eccentric wheels 28 are slidably arranged inside the fixing plate 24. The leveling mechanism 7 is described in detail below: In this embodiment, after the downspout 13 evenly lays the permeable material on the roadway base surface, as the drive motor 1 moves forward, the leveling mechanism 7, installed on the rear side of the outer wall of the base frame 5, processes the laid material. The leveling mechanism 7 is mounted on the base frame 5 via support columns 22. Both ends of the support columns 22 are equipped with pivot seats 23. One pivot seat 23 is fixed to the base frame 5, and the other pivot seat 23 is connected to a fixing plate 24. This allows the fixing plate 24 to have a certain adaptive swing capability relative to the base frame 5 to adapt to minor undulations in the ground.

[0027] As the device moves forward, the push plate 25, installed on the outer wall of the fixed plate 24 near the base frame 5, first contacts the laid permeable material, pushing the protruding material forward to achieve initial leveling. Next, the pressure plate 26 at the bottom of the fixed plate 24 presses down on the material, achieving initial compaction and leveling. To further improve the compaction effect and surface density, multiple pressure rollers 27 are rotatably installed inside the fixed plate 24. The outer walls of the pressure rollers 27 are all rotatably installed inside the pressure plate 26, forming a composite compaction structure. Eccentric wheels 28 are installed at both ends of the pressure rollers 27, and the eccentric wheels 28 are slidably installed inside the fixed plate 24. When the pressure rollers 27 roll on the material surface, the eccentric wheels 28 rotate accordingly. Due to their eccentric structure, periodic vibrations are generated, which are transmitted to the pressure plate 26 and the pressure rollers 27 themselves. Moderate vibration allows the cement slurry to evenly coat the aggregate and create point contact between the aggregates. This ensures the strength of the concrete while preventing excessive vibration from causing the cement slurry to sink and block the bottom pores, thus effectively preserving the interconnected porosity of the permeable concrete. Through the leveling by the push plate 25, the pre-pressing by the pressure plate 26, and the vibration compaction by the roller 27 with the eccentric wheel 28, the leveling mechanism 7 can efficiently complete the forming operation of the permeable structural layer, ensuring that the paved road surface is both flat and solid, and has good permeability, fully meeting the technical requirements for permeable pavements in sponge city construction.

[0028] like Figures 1-8 As shown, the present invention also provides a method for constructing a permeable concrete rainwater drainage system, the method comprising the following steps: S1. Use the road roller 2 at the front end of the drive unit 1 to level and compact the roadbed soil; install the trench excavator 3 at the rear end of the drive unit 1 to excavate longitudinal trenches on both sides of the compacted soil, bury semi-circular PVC pipes in the trenches, fill the pipes with gravel to form blind drains, and convert the ends of the semi-circular PVC pipes into full-circular pipes to extend into the rainwater well. S2. Remove the trench excavator 3, install the hopper 4 and laying mechanism at the rear end of the drive machine 1, and adjust the adjustable moving mechanism 6 to raise and lower the base frame 5, and control the distance between the material discharge nozzle 13 and the base surface to make it conform to the design thickness of the structural layer to be laid. S3. The crushed stone is evenly sprayed onto the base surface through the paving mechanism, and then leveled and compacted by the leveling mechanism 7 as the drive machine 1 moves forward, forming a permeable base layer with a thickness of 150~200mm; the material in the hopper 4 is replaced with permeable concrete with a strength grade of not less than C30, and then evenly sprayed onto the crushed stone base layer through the paving mechanism, and then vibrated and compacted by the leveling mechanism 7 as the drive machine 1 moves forward, forming a permeable base layer; S4. Cover and moisturize the completed permeable base layer for no less than 7 days. After the curing is completed, replace the material in hopper 4 with permeable mortar, lay a 20-40mm thick permeable mortar bonding layer on the permeable base layer, and then lay permeable bricks to form a permeable surface layer. S5. A circular pipe extending from the blind drain into the rainwater well will collect the rainwater that has seeped into the blind drain into the city's stormwater drainage system.

[0029] Specifically, first, the operator starts the drive unit 1, using the roller 2 at its front end to compact the roadway subgrade soil back and forth until the subgrade soil reaches the designed flatness and density. While the roller 2 is working or after it has finished, the trench excavator 3 is detachably installed at the rear end of the drive unit 1. As the drive unit 1 slowly advances along the roadway axis, the trench excavator 3 simultaneously excavates longitudinal trenches on both sides of the compacted subgrade soil. After the trench is formed, prefabricated semi-circular PVC pipes are immediately buried in the trench. The pipe diameter is calculated and determined based on the roadway width and the designed rainwater collection area. Graded crushed stone is filled into the semi-circular PVC pipes to form a permeable blind drain. When the blind drain extends to the rainwater well location, the end of the semi-circular PVC pipe is converted into a full-circular pipe, and the full-circular pipe is inserted into the inner wall of the rainwater well by at least 50mm to ensure that the subsequently collected rainwater can be smoothly discharged into the urban stormwater drainage system.

[0030] After the blind drain construction is completed, the trench excavator 3 is disassembled from the rear end of the drive unit 1, and the hopper 4 and the complete paving mechanism connected to it are replaced. At this time, according to the design thickness requirements of the structural layer to be paved, the operator adjusts the adjustable moving mechanism 6 to raise and lower the base frame 5, and precisely controls the distance between the material discharge nozzle 13 and the base surface.

[0031] Next, the crushed stone base layer is laid. The operator loads the crushed stone of the specified gradation into the hopper 4 and starts the drive motor 1. The power output shaft of the drive motor 1 drives the auger blade 8 to rotate at the bottom of the hopper 4. On the one hand, it initially agitates the crushed stone to prevent caking, and on the other hand, it pushes the crushed stone to one side of the hopper 4 so that it falls into the feeding pipe 12 connected to the bottom of the hopper 4. At the same time, the drive wheel 9 on the auger blade 8 drives the stirring shaft 11 to rotate synchronously through the two driven wheels 10, which fully agitates the crushed stone in the hopper 4 to ensure that the crushed stone is uniformly gradation. The bevel gear 14 and bevel gear 15 at the rear end of the auger blade 8 mesh to transmit power to the drive shaft 35, and then drive the bidirectional screw 17 to rotate in the base frame 5 through the transmission belt mechanism 16. The rotation of the bidirectional screw 17 causes the threaded sleeve 18 to reciprocate on it. The threaded sleeve 18, through the L-shaped connecting rod 20 and the fixed sleeve 19, drives the feeding pipe 12 and the discharge nozzle 13 at its lower end to continuously reciprocate along the width of the tunnel. The crushed stone is pushed into the feeding pipe 12 by the auger blade 8, and finally evenly sprayed onto the base surface from the reciprocating discharge nozzle 13 to form a uniform crushed stone layer. As the drive machine 1 continues to move forward, the leveling mechanism 7 installed on the rear side of the base frame 5 then processes the laid crushed stone: the push plate 25 first pushes the protruding crushed stone forward to level it, and the pressure plate 26 and the pressure roller 27 then lightly compact the crushed stone layer to form a permeable base layer with a thickness of 150~200mm. Since the crushed stone layer only needs to remain stable and should not be overly dense, the eccentric wheels 28 at both ends of the pressure roller 27 do not vibrate or only vibrate very slightly at this time to maintain the high porosity of the crushed stone layer.

[0032] After the crushed stone base course is laid, the material in hopper 4 is replaced with permeable concrete with a strength grade of not less than C30, and the above laying operation is repeated. The permeable concrete is also evenly sprayed onto the crushed stone base course using a reciprocating oscillating nozzle 13. Unlike the crushed stone layer, during the laying of the permeable concrete, as the pressure roller 27 rolls on the material surface, its eccentric wheels 28 at both ends rotate accordingly. Due to the eccentric structure of the eccentric wheels 28, periodic vibrations are generated during rotation, which are transmitted to the pressure plate 26 and the pressure roller 27 itself. Vibration compaction allows the cement slurry to evenly coat the aggregate and form stable point contact between the aggregates. This ensures the strength of the concrete while preventing excessive vibration from causing the cement slurry to sink and block the bottom pores, thus effectively preserving the interconnected porosity of the permeable concrete and forming a permeable base course that meets the design requirements.

[0033] After the permeable base layer is laid, it should be covered and kept moist for at least 7 days to ensure that the permeable concrete reaches the design strength.

[0034] After the permeable base layer has been cured to the required standard, the permeable surface layer is laid. At this time, the material in hopper 4 is replaced with permeable mortar, and the laying mechanism is started to evenly lay a 20-40mm thick permeable mortar bonding layer on the surface of the permeable base layer. During the laying process, a laser guidance device can be used to control the slope and thickness of the mortar to ensure that the surface flatness meets the design requirements. After the permeable mortar is laid, a dedicated road paving machine is used to lay permeable bricks on the mortar bonding layer. The paving machine automatically adjusts the brick angle according to the design slope to ensure that the paved road surface has a good drainage slope. A 3-5mm gap is left between the bricks during laying, and after laying, fine sand is used to clean the gaps, forming the final permeable surface layer.

[0035] Finally, during road use, some rainwater seeps directly down through the brick joints and the permeable bricks themselves into the permeable base layer and the gravel subbase, eventually flowing into the blind drains pre-buried on both sides of the alley. The rainwater collected in the blind drains is then discharged into the city's stormwater drainage system through circular pipes extending into storm drains, achieving effective rainwater collection and discharge, improving rainwater harvesting and utilization rates, and reducing urban flooding.

[0036] The above specific embodiments are merely several optional embodiments of the present invention. Based on the technical solutions of the present invention and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A permeable concrete stormwater drainage system combined construction device, comprising a drive unit (1) and a road roller (2) installed at the front end of the drive unit (1), characterized in that, Also includes: The trench excavator (3) and the hopper (4) are detachably installed at the rear end of the drive machine (1). The hopper (4) has an auger blade (8) rotatably installed on the lower side inside. The front end of the auger blade (8) is connected to the output shaft of the drive machine (1), and the rear end is equipped with a bevel gear (14). The construction device also includes a laying mechanism installed at the bottom of the hopper (4). The laying mechanism is installed at the bottom of the hopper (4) via a base frame (5), and adjustable moving mechanisms (6) are installed on both sides of the outer wall of the base frame (5), while a leveling mechanism (7) is installed on the rear side of the outer wall. A protective cover (21) is installed on the outside of the first bevel gear (14), and a drive shaft (35) is rotatably installed on one side inside the protective cover (21). A second bevel gear (15) is installed at one end of the drive shaft (35), and the first bevel gear (14) meshes with the second bevel gear (15). A bidirectional screw (17) is rotatably installed inside the base frame (5), and the... The bevel gear (15) is connected to the end of the double screw (17) via a transmission belt mechanism (16). The double screw (17) is threaded with a threaded sleeve (18) on its outer wall. An L-shaped connecting rod (20) is installed on one side of the outer wall of the threaded sleeve (18). A fixed sleeve (19) is installed at one end of the L-shaped connecting rod (20). A feeding pipe (12) is installed on the inner wall of the fixed sleeve (19). One end of the feeding pipe (12) is connected to the bottom side of the hopper (4) for conveying crushed stone, concrete, etc. The other end of the feeding pipe (12) is equipped with a discharge nozzle (13).

2. The permeable concrete rainwater drainage facility combined construction device according to claim 1, characterized in that, A drive wheel (9) is installed on the outer wall of the auger blade (8) near the drive motor (1). Two driven wheels (10) are rotatably arranged inside the hopper (4) near the auger blade (8). The two driven wheels (10) are respectively meshed on both sides of the outer wall of the drive wheel (9). A stirring shaft (11) is fixedly arranged inside the driven wheel (10).

3. The permeable concrete rainwater drainage facility combined construction device according to claim 2, characterized in that, The stirring shaft (11) is rotatably mounted on the inner wall of the hopper (4), and materials such as crushed stone and concrete can be placed inside the hopper (4).

4. The permeable concrete rainwater drainage facility combined construction device according to claim 1, characterized in that, The adjustable moving mechanism (6) is installed on both sides of the outer wall of the base frame (5) via a fixed column (29), and a sliding column (32) is slidably provided inside the fixed column (29). A bearing seat (33) is installed at the bottom of the sliding column (32), and a moving wheel (34) is installed inside the bearing seat (33).

5. The permeable concrete rainwater drainage facility combined construction device according to claim 4, characterized in that, The fixed column (29) is rotatably equipped with a lead screw (30), and a handle (31) is installed on the top of the lead screw (30).

6. The combined construction device for permeable concrete rainwater drainage facilities according to claim 5, characterized in that, The sliding column (32) has an internal thread inside, and the internal thread matches the outer wall of the lead screw (30).

7. The permeable concrete rainwater drainage facility combined construction device according to claim 1, characterized in that, The leveling mechanism (7) is installed on the rear side of the outer wall of the base frame (5) via a support column (22), and both ends of the support column (22) are provided with a pivot seat (23). One of the pivot seats (23) is installed on the rear side of the outer wall of the base frame (5), and the other pivot seat (23) is equipped with a fixing plate (24). A push plate (25) is installed on the side of the outer wall of the fixing plate (24) near the base frame (5), and a pressure plate (26) is installed at the bottom of the fixing plate (24).

8. The permeable concrete rainwater drainage facility combined construction device according to claim 7, characterized in that, The fixed plate (24) is rotatably provided with multiple pressure rollers (27), and the outer walls of the multiple pressure rollers (27) are rotatably provided inside the pressure plate (26).

9. A combined construction device for permeable concrete rainwater drainage facilities according to claim 8, characterized in that, Both ends of the pressure roller (27) are equipped with eccentric wheels (28), and the eccentric wheels (28) are slidably disposed inside the fixed plate (24).

10. A method for constructing a permeable concrete stormwater drainage system, applied to the permeable concrete stormwater drainage system construction device described in any one of claims 1-9, characterized in that, The method includes the following steps: S1. Use the road roller (2) at the front end of the drive machine (1) to level and compact the roadbed soil; install the trench excavator (3) at the rear end of the drive machine (1), excavate longitudinal trenches on both sides of the compacted soil, bury semi-circular PVC pipes in the trenches, fill the pipes with gravel to form blind trenches, and convert the ends of the semi-circular PVC pipes into full-circular pipes to extend into the rainwater well. S2. Remove the trench excavator (3), install the hopper (4) and laying mechanism at the rear end of the drive machine (1), and raise and lower the base frame (5) by adjusting the adjustable moving mechanism (6) to control the distance between the material nozzle (13) and the base surface so that it conforms to the design thickness of the structural layer to be laid. S3. The crushed stone is evenly sprayed onto the base surface through the laying mechanism, and then spread and compacted by the leveling mechanism (7) as the drive machine (1) moves forward, forming a permeable base layer with a thickness of 150~200mm; the material in the hopper (4) is replaced with permeable concrete with a strength grade of not less than C30, and then evenly sprayed onto the crushed stone base layer through the laying mechanism, and then vibrated and compacted by the leveling mechanism (7) as the drive machine (1) moves forward, forming a permeable base layer; S4. Cover and moisturize the permeable base layer after it has been laid. The curing time shall not be less than 7 days. After the curing is up to standard, replace the material in the hopper (4) with permeable mortar, lay a 20-40mm thick permeable mortar bonding layer on the permeable base layer, and then lay permeable bricks to form a permeable surface layer. S5. A circular pipe extending from the blind drain into the rainwater well will collect the rainwater that has seeped into the blind drain into the city's stormwater drainage system.

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