Subbase structure for preventing cracking of road base and construction method thereof

Abstract

The application relates to the technical field of road base construction, in particular to a bottom base structure for preventing road base cracking and a construction method thereof, which comprises a road base frame, the top of the road base frame is provided with a cushion layer, a gravel bottom base and a cement stabilized base, the inside of the road base frame is provided with a steel bar grid, the top of the steel bar grid is provided with a shunt filling mechanism, the shunt filling mechanism comprises a running plate, the outer side of the running plate is fixedly connected with an inclined plate, the inside of the inclined plate is provided with a discharging groove, the top of the running plate is fixedly connected with a water guide pipe, and a water outlet is arranged in the inner wall of the discharging groove. In the application, the inclined plates symmetrically arranged on the outer side of the running plate and the uniformly distributed discharging grooves are matched with the built-in feeding roller with the broken material convex points, so that the broken stone materials can be uniformly shunted and spread, the caked materials can be automatically broken, and the problems of material accumulation, uneven thickness and the like in traditional manual material spreading can be avoided.

Description

Technical Field

[0001] This invention relates to the field of road base construction technology, specifically to a subbase structure for preventing road base cracking and its construction method. Background Technology

[0002] In the existing road base construction technology field, the construction of municipal roads and highway subgrades generally adopts the forming process of layered filling and compaction. The road subbase is mostly constructed by laying the cushion layer, crushed stone subbase and cement stabilized base layer in sequence from bottom to top, and simply spreading and rolling them. Each structural layer mostly adopts the construction mode of independent spreading and separate compaction. The interlayer combination design is simple, and the overall structure relies on the compaction degree of the fill material itself to achieve load-bearing and shaping.

[0003] Traditional road subbase paving construction often adopts a manual-assisted mechanical paving operation mode, which has obvious technical defects in the construction process. Crushed stone and cement-stabilized mixture are prone to clumping, material accumulation, and uneven paving thickness during the paving process. This results in uneven distribution of crushed stone subbase material, poor overall compactness and uniformity of the base, uneven stress load, and problems such as uneven settlement and local cracking and damage after long-term use.

[0004] Therefore, a subbase structure and its construction method for preventing road base cracking are proposed to address the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a subbase structure for preventing road base cracking and its construction method, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A subbase structure for preventing road base cracking includes a road base frame, the top of which is provided with a cushion layer, a crushed stone subbase and a cement-stabilized base, the interior of which is provided with a steel grid, and the top of which is provided with a diversion filling mechanism.

[0008] The diversion and filling mechanism includes a rotating plate, an inclined plate fixedly connected to the outer side of the rotating plate, a material trough opened inside the inclined plate, a water guide pipe fixedly connected to the top of the rotating plate, a water outlet hole opened in the inner wall of the material trough, and a diversion hole opened in the side wall of the water guide pipe.

[0009] A transmission rod is rotatably connected to the side wall of the feeding trough, and a feeding roller is fixedly connected to the outside of the transmission rod. The feeding roller is provided with crushing protrusions on its outside.

[0010] As a further optimization of the present invention, a lifting mechanism is provided between the roadbed frame and the diversion filling mechanism. The lifting mechanism includes a lifting groove, a limit groove is formed in the inner wall of the lifting groove, a support column is movably engaged inside the lifting groove, a hidden groove is formed in the side wall of the support column, a moving rod is movably engaged in the inner wall of the hidden groove, a limit plate is fixedly connected to the outer side of the moving rod, and a compression spring is sleeved on the moving rod.

[0011] As a further optimization of the present invention, the subbase is located above the road base frame, the crushed stone subbase is located above the subbase, and the cement-stabilized base is located above the crushed stone subbase.

[0012] As a further optimization of the present invention, the operating plate is located at the center above the roadbed frame, the inclined plates are symmetrically distributed on the outside of the operating plate, and the tail ends of the inclined plates are located on both sides inside the roadbed frame.

[0013] As a further optimization of the present invention, the material feeding trough is evenly distributed inside the inclined plate, the interior of the operating plate is hollow, and the water guide pipe is evenly distributed on the top of the operating plate.

[0014] As a further optimization of the present invention, the water outlet and the water guide pipe are in a connected state, the top of the water guide pipe extends into the interior of the cement-stabilized base layer, and the water guide pipe traverses the interior of the cushion layer, the crushed stone base layer and the cement-stabilized base layer.

[0015] As a further optimization of the present invention, the diversion holes are evenly distributed in the side wall of the water guide pipe, the feeding rollers are evenly distributed inside the feeding trough, and the crushed material protrusions are evenly distributed on the outside of the feeding rollers.

[0016] As a further optimization of the present invention, the lifting grooves are symmetrically distributed on both sides of the inner wall of the roadbed frame, and the top of the support column is fixedly connected to the bottom of the operating plate.

[0017] As a further optimization of the present invention, the moving rod and the compression spring are symmetrically distributed between the hidden groove and the limiting snap plate, and the limiting snap plate is slidably connected inside the limiting groove, and the top of the limiting groove is open.

[0018] The construction method for the subbase structure of road base cracking includes the following steps:

[0019] S1. Subgrade base treatment and subgrade frame installation:

[0020] First, the road construction base is cleaned and leveled, removing debris, loose soil, and weak soil layers. A road roller is then used to compact the base in layers, ensuring the compaction meets the road construction design standards and is free of loose material and potholes. Based on the construction layout dimensions, the road base frame is precisely installed, ensuring its horizontal and vertical alignment meets standards, and that the frame joints are tight, securely fixed, and without any misalignment or gaps. After the road base frame is installed, lifting grooves are symmetrically excavated on both inner walls, with corresponding pre-reserved limiting groove structures, completing the foundation trench construction for the lifting mechanism and providing an installation benchmark for subsequent support components.

[0021] S2. Installation of lifting mechanism and steel grating:

[0022] The lifting mechanism components are prefabricated, assembling the support column, moving rod, compression spring, and limiting plate. The compression spring is sleeved on the outside of the moving rod, and the limiting plate is fixed to the end of the moving rod. The entire assembly is housed inside the hidden groove of the support column. The assembled support column is then vertically engaged in the lifting groove inside the roadbed frame. Utilizing the elasticity of the compression spring, the limiting plate slides into the limiting groove, completing the limiting and fixing of the support column and ensuring its vertical stability and flexible lifting adjustment. Subsequently, a steel grid is laid inside the roadbed frame, ensuring that the grid mesh is evenly distributed, firmly overlapped, and laid horizontally without warping or offset, thereby improving the overall tensile and crack resistance of the roadbed.

[0023] S3. Assembly and positioning installation of the diversion and filling mechanism:

[0024] The diversion and filling mechanism is pre-assembled, with inclined plates symmetrically fixed to the outside of the operating plate, ensuring consistent inclination angles and aligned tail ends. Material troughs are evenly spaced inside the inclined plates, and a transmission rod is rotatably installed inside the trough. Feeding rollers with material protrusions are fixed to the outside of the transmission rod, ensuring flexible rotation and even distribution of the material protrusions. A hollow water pipe is fixed to the top of the operating plate, and the diversion holes on the side wall of the water pipe are connected to the water outlet holes on the inner wall of the material trough, ensuring complete communication and forming a complete diversion, drainage, and filling channel. The assembled diversion and filling mechanism is then hoisted, positioning the operating plate at the center above the roadbed frame. The bottom of the operating plate is fixedly connected to the top of the support column of the lifting mechanism. The height and level of the mechanism are finely adjusted using the lifting mechanism to ensure overall stability and even stress distribution.

[0025] S4. Layered paving construction of road base:

[0026] The road base structure is laid in layers, strictly following the bottom-up construction sequence. First, a subbase layer is laid on top of the road base frame and outside the diversion and filling mechanism. During the laying of the subbase layer, the thickness is ensured to be uniform, the surface is spread evenly, and it is lightly compacted. After the subbase layer is completed, a crushed stone base layer is laid on top of it. During the laying process, the material is evenly distributed and filled using the material trough and feeding roller inside the inclined plate. The crushed stone is broken up by the crushing protrusions to avoid material accumulation and uneven spreading. At the same time, the water pipe runs through the subbase layer and the crushed stone base layer, ensuring that the pipe is vertical and centered. Finally, a cement-stabilized base layer is laid on top of the crushed stone base layer. The top of the water pipe extends into the interior of the cement-stabilized base layer. The water pipe diversion holes and outlet holes on the side wall allow water to be drained from the base layer, avoiding water accumulation and cracking caused by uneven moisture levels. After each layer is laid, leveling and compaction are carried out.

[0027] S5. Overall debugging, finishing touches and curing:

[0028] After all the structures are laid, a comprehensive test is conducted on the overall structure. The fixation status of the roadbed frame, the lifting flexibility and limit stability of the lifting mechanism are checked, the flatness of the steel grid is verified, and the drainage and filling of the diversion filling mechanism are checked for smoothness. It is ensured that the feeding roller rotates smoothly, the diversion holes and outlet holes of the water pipe are not blocked, and the subbase, crushed stone base and cement stabilized base are tightly bonded. Gaps and loose areas that appear during construction are filled and compacted, and the flatness of the base surface is repaired. After the test is qualified, the road base is subjected to standardized maintenance treatment, and dust prevention, moisture retention and protection measures are taken to avoid cracking of the base caused by external crushing and temperature difference deformation. After the base strength reaches the standard, the overall construction process is completed.

[0029] Compared with the prior art, the beneficial effects of the present invention are:

[0030] 1. In this invention, by setting a steel grid inside the roadbed frame, combined with the layered subbase, crushed stone base course and cement-stabilized base course, the overall structural strength and tensile performance of the road base course are effectively improved. The steel grid can evenly distribute the compressive load on the base course, alleviate the stress concentration caused by road vehicle rolling and environmental temperature changes, and avoid cracking and arching due to excessive local stress in the base course. At the same time, the roadbed frame forms a limiting constraint on the overall base course structure, effectively reducing roadbed settlement and displacement deformation, significantly reducing the probability of road base course cracking from a structural perspective, and significantly improving the overall stability and service life of the road base course.

[0031] 2. In this invention, the diversion and filling mechanism combines the functions of uniform filling and precise water replenishment and mixing, making it highly practical. Through the symmetrically arranged inclined plates and evenly distributed feeding troughs on the outside of the operating plate, combined with the built-in feeding roller with crushing material protrusions, the crushed stone material can be evenly diverted and spread, automatically breaking up lumps of material. This avoids the problems of material accumulation and uneven thickness in traditional manual spreading, ensuring that the crushed stone base layer is laid evenly and densely. At the same time, the hollow structure of the operating plate, combined with the water guide pipe, can evenly deliver water to the interior of each base layer through the connected diversion holes and water outlet holes, precisely humidifying the crushed stone and cement-stabilized mixture, making the material ratio balanced and the mixing sufficient, effectively improving the bonding strength between materials, avoiding cracking and sanding problems caused by dry and loose base materials and insufficient bonding strength, and greatly improving the overall consolidation and firmness of the base layer.

[0032] 3. In this invention, the adjustable installation of the diversion and filling mechanism is achieved by adding a lifting mechanism, which greatly improves the structural adaptability and construction convenience. The lifting groove, support column, compression spring and limit clamp plate form an elastic limit lifting structure, which can flexibly adjust the installation height and level of the operating plate according to the construction needs, adapt to different roadbed construction conditions, ensure the installation accuracy of the diversion and filling and drainage structure, the overall structure layout is compact and reasonable, the components have strong linkage, the installation and disassembly are convenient, the construction error tolerance is high, which can effectively improve the construction quality and efficiency of the road subbase, and reduce the later road maintenance and repair costs. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the overall structure of the present invention when unfolded;

[0034] Figure 2 This is a schematic diagram of the internal structure of the roadbed frame of the present invention;

[0035] Figure 3 This is a schematic diagram of the outer structure of the flow-diverting filling mechanism of the present invention;

[0036] Figure 4 This is a schematic diagram of the structure between the roadbed frame and the reinforcing steel grid of the present invention;

[0037] Figure 5 This is a schematic diagram of the outer side of the inclined plate of the present invention;

[0038] Figure 6 This is a schematic diagram of the internal structure of the feeding trough of the present invention;

[0039] Figure 7 This is a schematic diagram of the structure of the top of the operating plate of the present invention;

[0040] Figure 8 For the present invention Figure 7 Enlarged view of the structure at point A in the middle;

[0041] Figure 9 For the present invention Figure 4 Enlarged view of the structure at point B;

[0042] Figure 10 This is a physical image of the present invention.

[0043] In the diagram: 1. Road base frame; 2. Subbase; 3. Crushed stone subbase; 4. Cement stabilized base; 5. Reinforcing grating; 6. Diversion and filling mechanism; 61. Rotating plate; 62. Inclined plate; 63. Discharge chute; 631. Transmission rod; 632. Feeding roller; 633. Crushed material protrusion; 64. Water guide pipe; 65. Water outlet; 66. Diversion hole; 7. Lifting mechanism; 71. Lifting groove; 72. Limiting groove; 73. Support column; 731. Concealed groove; 732. Moving rod; 733. Limiting locking plate; 734. Compression spring. Detailed Implementation

[0044] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0046] Please see Figures 1-10 The present invention provides a technical solution:

[0047] A subbase structure for preventing road base cracking includes a road base frame 1, a cushion layer 2, a crushed stone subbase 3 and a cement-stabilized base layer 4 on the top of the road base frame 1, a steel grid 5 inside the road base frame 1, and a diversion filling mechanism 6 on the top of the steel grid 5.

[0048] The diversion filling mechanism 6 includes a rotating plate 61, an inclined plate 62 fixedly connected to the outer side of the rotating plate 61, a feeding trough 63 opened inside the inclined plate 62, a water guide pipe 64 fixedly connected to the top of the rotating plate 61, a water outlet hole 65 opened in the inner wall of the feeding trough 63, and a diversion hole 66 opened in the side wall of the water guide pipe 64.

[0049] A transmission rod 631 is rotatably connected to the side wall of the feeding trough 63. A feeding roller 632 is fixedly connected to the outside of the transmission rod 631. A crushing protrusion 633 is provided on the outside of the feeding roller 632.

[0050] It should be noted that: the subbase 2 is located above the roadbed frame 1, the crushed stone base course 3 is located above the subbase 2, the cement stabilized base course 4 is located above the crushed stone base course 3, the rotating plate 61 is located at the center above the roadbed frame 1, the inclined plates 62 are symmetrically distributed on the outside of the rotating plate 61, and the tail ends of the inclined plates 62 are located on both sides inside the roadbed frame 1, the material trough 63 is evenly distributed inside the inclined plate 62, the interior of the rotating plate 61 is hollow, the water pipe 64 is evenly distributed on the top of the rotating plate 61, the water outlet 65 is connected to the water pipe 64, the top of the water pipe 64 extends into the interior of the cement stabilized base course 4, and the water pipe 64 traverses the interior of the subbase 2, the crushed stone base course 3 and the cement stabilized base course 4, the diversion hole 66 is evenly distributed in the side wall of the water pipe 64, the feeding roller 632 is evenly distributed inside the material trough 63, and the crushed material protrusions 633 are evenly distributed on the outside of the feeding roller 632.

[0051] Furthermore, the roadbed frame 1, as the overall load-bearing and limiting base structure of this device, provides a regular construction and forming boundary and installation benchmark for the entire road subbase. The roadbed frame 1 can form an overall constraint on the various layers of roadbed material laid inside, effectively limiting the lateral displacement and loose expansion of the roadbed material, and avoiding the problems of edge collapse and uneven width after the base is formed. At the same time, it provides a stable installation carrier for the steel bar grid 5, the diversion filling mechanism 6 and the lifting mechanism 7, ensuring that the installation position of each functional component is accurate and the working state is stable, thereby improving the forming regularity and overall stability of the road subbase from the basic structure.

[0052] Specifically: The steel grating 5 is laid inside the road base frame 1 and is located at the bottom stress position of each base structure. It mainly plays a structural role of tensile strength, pressure relief and fracture prevention. The road base is prone to tensile stress and deformation under the action of vehicle load, temperature alternation and slight foundation settlement. The steel grating 5 can effectively bear and disperse the concentrated stress inside the base with its own high tensile strength, block the generation and extension of micro cracks, and offset the vertical and horizontal deformation trend of the base. It avoids cracking and fracture of the subbase 2, crushed stone base 3 and cement stabilized base 4 due to uneven stress, and greatly improves the overall linkage stress capacity of the multi-layer base structure.

[0053] Meanwhile, the subbase 2, crushed stone base course 3, and cement-stabilized base course 4 are laid in layers from bottom to top, forming the main load-bearing system of the road subbase. Each layer performs its own function and cooperates with the others. The subbase 2 plays a role in leveling, buffering, and isolating, which can eliminate the flatness error of the base of the road base frame 1 and evenly transfer the upper load. The crushed stone base course 3 has good skeleton support and porosity adaptability, which can provide space for material mixing and water penetration, ensuring the overall density and permeability of the base course. The cement-stabilized base course 4, as the surface load-bearing structure, forms a high-strength overall load-bearing surface after curing. The three-layer structure works together to effectively improve the overall load-bearing strength and deformation resistance of the roadbed.

[0054] As a further implementation of this scheme, a lifting mechanism 7 is provided between the roadbed frame 1 and the diversion filling mechanism 6. The lifting mechanism 7 includes a lifting groove 71, a limiting groove 72 is opened in the inner wall of the lifting groove 71, a support column 73 is movably engaged inside the lifting groove 71, a hidden groove 731 is opened in the side wall of the support column 73, a moving rod 732 is movably engaged in the inner wall of the hidden groove 731, a limiting plate 733 is fixedly connected to the outer side of the moving rod 732, and a compression spring 734 is sleeved on the moving rod 732.

[0055] It should be noted that: the lifting grooves 71 are symmetrically distributed on both sides of the inner wall of the roadbed frame 1, the top of the support column 73 is fixedly connected to the bottom of the operating plate 61, the moving rod 732 and the compression spring 734 are symmetrically distributed between the hidden groove 731 and the limiting plate 733, and the limiting plate 733 is slidably connected inside the limiting groove 72, and the top of the limiting groove 72 is open.

[0056] Furthermore, the diversion and filling mechanism 6, as the core functional component of this device, is specifically designed to optimize the quality of base material paving and the mixing and curing conditions. The rotating plate 61 serves as the central support and water conveyance base, while the symmetrically arranged inclined plates 62 guide the material to be evenly distributed throughout the roadbed. This, combined with the material chute 63, achieves quantitative and uniform material distribution. Inside the material chute 63, the transmission rod 631 drives the feeding roller 632 to rotate, utilizing the material breakup protrusions 633 to break up material agglomeration. This addresses the issues of uneven material distribution and inconsistent density in localized areas during the paving process, providing a preliminary guarantee for uniform stress distribution across the base layer and preventing uneven settlement and cracking.

[0057] Specifically, the water pipe 64, the diversion hole 66, and the outlet hole 65 form an integrated uniform humidification structure, completely changing the limitations of traditional surface sprinkling. The water pipe 64, which runs through the subbase 2, the crushed stone base course 3, and the cement-stabilized base course 4, can guide the water source deep into the base course. The diversion holes 66, which are densely distributed on the side wall, achieve multi-layer three-dimensional water infiltration. At the same time, the outlet hole 65, which is connected to the material trough 63, enables the material to be humidified synchronously, so that the water can penetrate evenly into the interior of the mixture, ensuring that the hydration reaction of the cement-stabilized material is sufficient and uniform, improving the bonding strength between particles and the integrity between layers, and avoiding problems such as loosening, dusting, and cracking of the base course due to differences in dryness and wetness.

[0058] Meanwhile, the lifting mechanism 7 provides adaptive height adjustment and limit support for the diversion and filling mechanism 6. The lifting groove 71 and the limit groove 72 form a vertical sliding limit track, and the support column 73 realizes the vertical support and positioning of the operating plate 61. Relying on the elastic engagement of the moving rod 732, compression spring 734 and limit locking plate 733 inside the hidden groove 731, the support height and levelness can be adaptively adjusted according to different subgrade thicknesses and paving construction requirements. This structure can always ensure that the diversion and filling mechanism 6 is in the optimal working position, ensure the accuracy of material uniformity and humidification operations, adapt to various construction conditions, and improve the versatility of the structure and the construction error tolerance.

[0059] Example 1: Uniform filling to prevent uneven material distribution:

[0060] This structure, through the coordinated operation of inclined plates 62, feeding troughs 63, and feeding rollers 632 with crushing protrusions 633, achieves automated and uniform filling and paving of crushed stone materials for the subbase. During construction, the crushed stone materials fall through the evenly distributed feeding troughs 63 inside the inclined plates 62. The feeding rollers 632 inside the feeding troughs 63 rotate continuously, using the densely distributed crushing protrusions 633 on their surface to break up and disperse lumps and agglomerates of crushed stone materials in real time, preventing material agglomeration, excessive local aggregate, or gaps. At the same time, the symmetrically arranged inclined plates 62 can evenly distribute materials to both sides of the roadbed. Combined with the limiting effect of the roadbed frame 1, this ensures that the overall paving thickness of the crushed stone subbase 3 is consistent, and the material distribution is uniform and dense. This completely solves the defects of uneven thickness, local voids, and concentrated aggregate that are prone to occur in traditional manual paving. It also avoids problems such as local stress imbalance, large settlement differences, and irregular cracking in the subbase caused by uneven material distribution, effectively ensuring the overall flatness and structural uniformity of the subbase.

[0061] Example 2: Uniform water replenishment enhances the coagulation properties of the mixture:

[0062] This structure utilizes a hollow rotating plate 61, water guide pipes 64, diversion holes 66, and outlet holes 65 to form a comprehensive water replenishment system, achieving uniform humidification of the base mixture and significantly improving the overall solidification and bonding effect. During the paving and compaction of the base, external water is introduced into the interior of each water guide pipe 64 through the hollow rotating plate 61. The water penetrates layer by layer, at multiple points, and evenly into the subbase 2, crushed stone base course 3, and cement-stabilized base course 4 through the diversion holes 66 densely distributed on the side wall of the water guide pipes 64 and the outlet holes 65 connected to the material trough 63. It can accurately match the optimal hydration and solidification moisture content of the cement-stabilized mixture. Compared with the traditional surface watering method, this structure can achieve deep water replenishment inside the base, avoiding the problem of uneven wetting and drying, which results in wet surface and dry interior. This allows the crushed stone and cement mixture to fully hydrate and react, resulting in tighter bonding between particles, significantly improving the overall solidification strength and integrity of the base, and effectively solving the problems of loose base, insufficient strength, cracking, and peeling caused by dry mixture and insufficient hydration.

[0063] Workflow: The subbase structure for preventing road base cracking relies on the coordinated operation of overall limiting support, automatic material uniformity and crushing, uniform water replenishment throughout the area, and adaptive lifting and lowering adjustment to achieve high-quality paving and long-term crack prevention effect of the road base. The overall roadbed bearing structure is externally limited and shaped by the roadbed frame 1, and the internal steel grid 5 can form an overall tensile buffer for the upper cushion layer 2, crushed stone subbase 3, and cement stabilized base layer 4, dispersing traffic loads and thermal shrinkage stress, and inhibiting base deformation cracking from a mechanical perspective.

[0064] The diversion and filling mechanism 6 forms a symmetrical diversion and material distribution structure through the centrally positioned operating plate 61 and the symmetrical inclined plates 62 on both sides. The transmission rod 631 drives the feeding roller 632 inside the feeding trough 63 to rotate continuously. The crushing protrusions 633 crush and comb the falling mixture, preventing material agglomeration and localized agglomeration from the source, and ensuring that the density of the crushed stone base layer 3 is uniform. At the same time, the hollow operating plate 61 provides a stable water delivery channel for the water pipe 64. The water flows through the diversion hole 66 and the outlet hole 65 in both directions to divert and penetrate, which can uniformly humidify and replenish the multi-layer base mixture, ensuring that the cement mixture is fully hydrated and consolidated, and improving the overall bonding between layers.

[0065] The lifting mechanism 7 works in conjunction with the lifting groove 71 and the limiting groove 72 inside the roadbed frame 1. It utilizes the moving rod 732, compression spring 734 and limiting snap plate 733 in the hidden groove 731 inside the support column 73 to form an elastic limiting lifting structure. It can adaptively and finely adjust the installation height and horizontal accuracy of the operating plate 61 according to the roadbed construction thickness and paving conditions, ensuring that the material uniformity and water replenishment structure is always in the best working posture, ensuring that the base layer is paved evenly and firmly, and effectively avoiding various base layer cracking diseases caused by uneven material, insufficient bonding and stress imbalance.

[0066] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A subbase structure for preventing road base cracking, comprising a road base frame (1), characterized in that: The top of the roadbed frame (1) is provided with a cushion layer (2), a crushed stone base layer (3) and a cement stabilized base layer (4), and the interior of the roadbed frame (1) is provided with a steel bar grid (5), and the top of the steel bar grid (5) is provided with a diversion filling mechanism (6). The diversion filling mechanism (6) includes a rotating plate (61), an inclined plate (62) is fixedly connected to the outside of the rotating plate (61), a feeding trough (63) is opened inside the inclined plate (62), a water guide pipe (64) is fixedly connected to the top of the rotating plate (61), a water outlet hole (65) is opened in the inner wall of the feeding trough (63), and a diversion hole (66) is opened in the side wall of the water guide pipe (64). A transmission rod (631) is rotatably connected to the side wall of the feeding trough (63), and a feeding roller (632) is fixedly connected to the outside of the transmission rod (631). A crushing protrusion (633) is provided on the outside of the feeding roller (632).

2. The subbase structure for preventing road base cracking according to claim 1, characterized in that: A lifting mechanism (7) is provided between the roadbed frame (1) and the diversion filling mechanism (6). The lifting mechanism (7) includes a lifting groove (71). A limit groove (72) is opened in the inner wall of the lifting groove (71). A support column (73) is movably connected inside the lifting groove (71). A hidden groove (731) is opened in the side wall of the support column (73). A moving rod (732) is movably connected in the inner wall of the hidden groove (731). A limit plate (733) is fixedly connected to the outside of the moving rod (732). A compression spring (734) is sleeved on the moving rod (732).

3. The subbase structure for preventing road base cracking according to claim 1, characterized in that: The subbase (2) is located above the roadbed frame (1), the crushed stone base course (3) is located above the subbase (2), and the cement-stabilized base course (4) is located above the crushed stone base course (3).

4. The subbase structure for preventing road base cracking according to claim 1, characterized in that: The operating plate (61) is located at the center above the roadbed frame (1), and the inclined plates (62) are symmetrically distributed on the outside of the operating plate (61), with the tail ends of the inclined plates (62) located on both sides inside the roadbed frame (1).

5. A subbase structure for preventing road base cracking according to claim 1, characterized in that: The feeding trough (63) is evenly distributed inside the inclined plate (62), the interior of the operating plate (61) is hollow, and the water guide pipe (64) is evenly distributed on the top of the operating plate (61).

6. The subbase structure for preventing road base cracking according to claim 1, characterized in that: The water outlet (65) is in communication with the water guide pipe (64). The top of the water guide pipe (64) extends into the interior of the cement-stabilized base layer (4), and the water guide pipe (64) traverses the interior of the cushion layer (2), the crushed stone base layer (3), and the cement-stabilized base layer (4).

7. The subbase structure for preventing road base cracking according to claim 1, characterized in that: The diversion holes (66) are evenly distributed in the side wall of the water guide pipe (64), the feeding roller (632) is evenly distributed inside the feeding trough (63), and the crushed material protrusions (633) are evenly distributed on the outside of the feeding roller (632).

8. A subbase structure for preventing road base cracking according to claim 2, characterized in that: The lifting grooves (71) are symmetrically distributed on both sides of the inner wall of the roadbed frame (1), and the top of the support column (73) is fixedly connected to the bottom of the operating plate (61).

9. A subbase structure for preventing road base cracking according to claim 2, characterized in that: The moving rod (732) and the compression spring (734) are symmetrically distributed between the hidden groove (731) and the limiting snap plate (733), and the limiting snap plate (733) is slidably connected inside the limiting groove (72), and the top of the limiting groove (72) is open.

10. A method for constructing a subbase structure for preventing road base cracking as described in any one of claims 1 to 9, characterized in that: Includes the following steps: S1. Subgrade base treatment and subgrade frame installation: First, the road construction base is cleaned and leveled, removing debris, loose soil and weak soil layers. A road roller is used to compact the base in layers to ensure that the compaction degree meets the road construction design standards and that there is no looseness or pits. According to the construction layout dimensions, the road base frame (1) is installed precisely to ensure that the horizontality and verticality of the road base frame (1) meet the standards, and that the frame is tightly spliced ​​and firmly fixed without any deviation or gaps. After the road base frame (1) is installed, lifting grooves (71) are symmetrically excavated and arranged on the inner walls on both sides, and corresponding limit grooves (72) are reserved to complete the construction of the foundation groove of the lifting mechanism (7), providing an installation benchmark for the subsequent installation of support components. S2. Installation of lifting mechanism and steel grating: The lifting mechanism (7) components are prefabricated and processed in advance. The support column (73), moving rod (732), compression spring (734) and limiting plate (733) are assembled. The compression spring (734) is sleeved on the outside of the moving rod (732), and the limiting plate (733) is fixed to the end of the moving rod (732). The whole is stored in the hidden groove (731) of the support column (73). The assembled support column (73) is vertically clamped into the lifting groove (71) inside the roadbed frame (1). The elastic extension and contraction characteristics of the compression spring (734) are used to make the limiting plate (733) slide into the limiting groove (72) to complete the limiting and fixing of the support column (73), ensuring that the support column (73) is vertically stable and can be flexibly lifted and adjusted. Subsequently, steel grid (5) is laid inside the roadbed frame (1) to ensure that the grid mesh is evenly arranged, firmly overlapped, laid horizontally as a whole, without warping or offset, thereby improving the overall tensile and crack resistance of the roadbed. S3. Assembly and positioning installation of the diversion and filling mechanism: The diversion and filling mechanism (6) is pre-assembled. The inclined plate (62) is symmetrically fixed on the outside of the operating plate (61) to ensure that the inclined plate (62) has a consistent tilt angle and the tail end is aligned. The feeding trough (63) is evenly opened inside the inclined plate (62). The transmission rod (631) is rotatably installed inside the feeding trough (63). The feeding roller (632) with broken material protrusions (633) is fixedly arranged on the outside of the transmission rod (631) to ensure that the feeding roller (632) rotates flexibly and the broken material protrusions (633) are evenly distributed. The hollow structure water pipe (64) is fixedly installed on the top of the operating plate (61). The diversion hole (66) on the side wall of the water pipe (64) is opened to connect with the water outlet hole (65) on the inner wall of the feeding trough (63) to ensure that the two are completely connected and form a complete diversion drainage and filling channel. The assembled diversion filling mechanism (6) is hoisted as a whole, and the operating plate (61) is positioned at the center above the roadbed frame (1). The bottom of the operating plate (61) is fixedly connected to the top of the support column (73) of the lifting mechanism (7). The height and level of the body are finely adjusted by the lifting mechanism (7) to ensure that the whole mechanism is stable and the force is uniform. S4. Layered paving construction of road base: The road base structure is laid in layers in sequence, strictly following the construction sequence from bottom to top. First, a subbase (2) is laid on the top of the road base frame (1) and outside the diversion filling mechanism (6). During the laying of the subbase (2), the thickness is ensured to be uniform, the surface is spread flat, and it is lightly rolled and compacted. After the subbase (2) is completed, the crushed stone base course (3) is laid on top of it. During the laying process, the material trough (63) and feeding roller (632) inside the inclined plate (62) are used to complete the uniform distribution and filling of crushed stone materials. The crushed stone material is broken up by the crushed material protrusion (633) to avoid material accumulation and uneven laying. At the same time, the water pipe (64) runs through the subbase (2) and the crushed stone base course (3) to ensure that the pipeline is vertical and centered. Finally, the cement-stabilized base course (4) is laid on top of the crushed stone base course (3). The top of the water pipe (64) extends into the cement-stabilized base course (4). The water is drained through the diversion hole (66) and water outlet hole (65) on the side wall of the water pipe (64) to avoid water accumulation and uneven drying and wetting causing the base course cracking problem. After each layer of structure is laid, leveling and compaction operations are carried out. S5. Overall debugging, finishing touches and curing: After all the structures are laid, the overall structure is fully debugged. The fixed state of the road base frame (1), the lifting mechanism (7) lifting flexibility and limit stability are checked. The flatness of the steel grid (5) is verified, and the drainage and filling of the diversion filling mechanism (6) are checked. It is ensured that the feeding roller (632) rotates smoothly, the diversion hole (66) and the outlet hole (65) of the water pipe (64) are not blocked, and the subbase (2), crushed stone base (3) and cement stabilized base (4) are tightly bonded. The gaps and loose areas that appear during the construction process are filled and compacted. The flatness of the base surface is repaired. After the debugging is qualified, the road base is standardized and maintained. Dust prevention, moisture retention and protection measures are taken to avoid external crushing and temperature difference deformation that cause the base to crack. After the base strength reaches the standard, the overall construction process is completed.

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