Water-stable paving longitudinal joint zero-segregation construction process and equipment

Abstract

The invention discloses a water-stable paving longitudinal joint zero-segregation construction process and equipment, and relates to the technical field of road engineering, in particular to the water-stable paving longitudinal joint zero-segregation construction process and equipment, and the process comprises the following steps: pretreating a paved joint side section to form a firm vertical working surface; paving equipment with a lateral compaction function is adopted, so that an anti-segregation feeding system fills a new mixture into a joint area in a step layering manner, and meanwhile, a lateral compaction mechanism performs high-frequency lateral compaction on the filled mixture, so that the new material and the old material are tightly interlocked. The equipment is a double-helix anti-segregation paver and comprises an anti-segregation feeding system (a main helix and an auxiliary helix) and an integrated lateral compaction mechanism. Zero segregation of longitudinal joints is achieved, and compared with aggregate grading, density and unconfined compressive strength at the joints and a main laying layer, the variable coefficient is smaller than 5%.

Description

Technical Field

[0001] This invention relates to the field of road engineering technology, specifically to a construction process and equipment for zero segregation at longitudinal joints in water-stabilized paving. Background Technology

[0002] In the paving construction of water-stabilized crushed stone base courses, especially during multi-machine paving or multi-span paving operations, longitudinal joints are inevitably generated. The quality of treatment of longitudinal joints directly affects the integrity, flatness, density, and long-term performance of the base course.

[0003] Currently, traditional longitudinal joint treatment processes typically suffer from the following problems: First, at the joint, large aggregates are prone to rolling to the edge due to the centrifugal force of the paver's auger distributor, leading to segregation of the mix in the joint area, i.e., separation of coarse and fine aggregates. Second, due to the lack of effective lateral restraint and compaction, the newly laid mix often does not bond tightly with the joint surface of the existing layer, forming a weak zone and resulting in insufficient density at the joint. This segregation and weak bonding make this area a weak link in the base structure. Under long-term load and water conditions, it is prone to early damage such as aggregate spalling, base loosening, network cracking, and subsidence at the joint, seriously affecting the service life of the road.

[0004] To improve joint quality, existing technologies often involve manual trimming of the joint sides of the laid layers (such as applying cement slurry) or focused filling and compaction of the joint area after paving. However, these methods are not only inefficient and prone to quality fluctuations, but also rely heavily on worker experience. Furthermore, they are "post-construction remedies" that fail to fundamentally eliminate segregation and cannot guarantee the consistency and uniformity of the joint material and the main ply material in terms of gradation and density.

[0005] Therefore, there is an urgent need in this field for a longitudinal joint construction technology and equipment that can innovate in terms of paving process principles and equipment structure, actively prevent segregation while the mixture is being paved and filled, and achieve tight interlocking of new and old materials, so as to form high-quality, zero-segregation longitudinal joints and thus improve the overall construction quality of water-stabilized base courses. Summary of the Invention

[0006] The purpose of this invention is to provide a construction process and equipment for zero segregation at longitudinal joints in water-stabilized paving. Through an innovative stepped layered filling and synchronous high-frequency lateral compaction process, combined with a dedicated double-helix feeding and lateral compaction equipment, the quality of longitudinal joints in water-stabilized layers is fundamentally improved. Its advantages are significant: it effectively eliminates segregation at the joints, improves the density and integrity of the joints, thereby enhancing the uniformity and long-term service performance of the pavement structure and reducing later maintenance costs.

[0007] To achieve the above objectives, this invention utilizes the following technical solution: a zero-segregation construction process and equipment for longitudinal joints in water-stabilized paving. Its core innovation lies in the systematic reform of traditional longitudinal joint treatment methods. Traditional processes often rely solely on the natural compression of the paver's screed, resulting in a rather crude treatment of the joint between new and old pavements. This easily leads to coarse aggregate rolling and accumulating on the joint side, forming structurally weak surfaces. This process first emphasizes the pretreatment of the side sections of the existing pavement joints. This is not simply cleaning, but rather cutting or trimming with specialized tools to create a solid, neat, and perpendicular working surface to the road surface, providing a foundation for high-quality material interlocking. Secondly, it explicitly requires the use of specialized equipment with specific functions. The anti-segregation feeding system and lateral compaction mechanism of this equipment must work in tandem and be aligned with the joint surface. The process is not simply material filling, but a dynamic combination of "stepped layering" filling and "high-frequency lateral compaction." This means that the new mix is ​​densely filled from the bottom of the joint, then layer by layer upwards. Simultaneously, the lateral compaction mechanism continuously applies a tamping force parallel to the pavement direction. This force effectively "push" the new mix particles into the existing pavement's skeletal structure, achieving tight interlocking at the microscopic level, rather than relying solely on vertical compaction. Finally, through leveling and final compaction, the joint area is made identical to the main pavement in terms of aggregate distribution and density, thus truly achieving the goal of "zero segregation" and significantly improving the integrity and durability of the pavement structure.

[0008] Furthermore, in the joint area, if new mix is ​​poured in from top to bottom all at once, the mix at the top will naturally roll down under gravity. Larger aggregates, due to their greater inertia, are more likely to separate and accumulate at the bottom or edge of the joint, causing gradation imbalance. The stepped layering method specified in this process is an active and controlled filling strategy. It requires the mix to be first delivered and fully and densely fill the bottom area of ​​the joint. This initial step ensures that the bottom of the joint—the location most prone to voids and weak points—receives sufficient and dense material support first. Based on this, subsequent mixes are then added layer by layer, from bottom to top, to fill the upper space of the joint. This bottom-up filling sequence effectively avoids the free fall of the mix in the vertical direction and aggregate segregation. Each new layer is added after the previous layer has been in place and initially stabilized, thus keeping the material filling process in the entire joint area under control, maintaining the original uniform gradation of the mix to the greatest extent possible, and creating uniform material conditions for subsequent lateral compaction.

[0009] Furthermore, high-frequency lateral compaction is a dynamic compaction technology where the direction of force is strictly defined as parallel to the pavement plane and perpendicular to the paver's forward direction. This means that the compaction force acts horizontally and directly on the interface between the new material and the existing pavement. Limiting the vibration frequency range to 40-70 Hz is based on in-depth research into the compaction characteristics of water-stabilized mixtures. If the frequency is too low (e.g., below 40 Hz), the impact energy will be too large, potentially damaging the edge structure of the existing pavement and failing to form effective particle reorganization vibration; if the frequency is too high (e.g., above 70 Hz), the vibration energy may be too weak to overcome the internal friction between aggregates, failing to achieve effective interlocking. A vibration frequency of 40-70 Hz can produce the optimal "liquefaction" effect in the mixture, that is, moderately reducing the internal friction between fine aggregates and slurry, allowing coarse and fine aggregates to rearrange and reposition themselves under continuous micro-vibration. Under the combined action of lateral pressure, particles in the new mixture can more smoothly embed into the gaps between particles at the edge of the existing pavement, forming a tightly interlocked structure. This dynamic, high-frequency lateral compaction is far more effective than static lateral pressure and is a core technical means to achieve close integration of new and old materials.

[0010] Furthermore, the equipment retains basic components such as the main frame, power system, hopper, and conventional screed to ensure standard paving functionality. Its core improvements lie in the dedicated "anti-segregation feeding system" and "integrated lateral compaction mechanism"—two major functional modules. The anti-segregation feeding system is not simply a traditional auger distributor, but rather a specially designed system for the feeding characteristics of joint areas, aiming to achieve gentle and controllable material transport, preventing segregation due to excessive agitation during transport. The integrated lateral compaction mechanism is a groundbreaking design; it is securely mounted on the main frame, forming an integral part of the paver, and can simultaneously compact the joint area following the feeding system during paving operations. This integrated design ensures precise temporal and spatial coordination between lateral compaction and material filling, solving the problems of process disconnect, low efficiency, and uneven quality caused by the traditional method of first laying material and then performing lateral compaction manually or with additional equipment. This equipment is the physical carrier for realizing the aforementioned process methods, and its structural design directly determines the feasibility of the process objectives.

[0011] Further, the specific composition of the anti-segregation feeding system is described. It employs a double-helix design, including a main helix feeder and an independently driven auxiliary helix feeder located on the joint side. This design provides significant flexibility in joint-side feeding. The main helix is ​​responsible for conveying material over most of the paving trough area, and its rotational speed is set according to the paving width and speed to ensure the uniformity of the main paving layer. The auxiliary helix feeder is independently driven, and its rotational speed is set lower than that of the main helix feeder. Reducing the rotational speed of the auxiliary helix is ​​one of the key measures for preventing segregation. Higher rotational speeds cause the helix blades to exert a strong throwing and tumbling effect on the mixture, exacerbating the separation of coarse aggregates. By reducing the rotational speed of the auxiliary helix on the joint side, disturbance to the mixture can be significantly reduced, achieving a smoother, almost "creeping" feeding process. This low-speed, gentle feeding method ensures that the mixture is conveyed to the joint area in a relatively complete gradation state, providing a uniform material base for subsequent lateral compaction and suppressing segregation caused by the feeding process itself from the source.

[0012] Furthermore, an adjustable guide vane with adjustable angle and opening is added to the outlet of the secondary screw feeder. This is an important precision control device. After the secondary screw conveys the mixture to the joint area, if the discharge trajectory and flow rate of the mixture are not controlled, segregation may still occur due to free fall or impact. The adjustable guide vane's function is to precisely guide the discharge. Operators can adjust the angle and opening size of the guide vane in real time according to the depth and width of the joint and the characteristics of the mixture (such as coarseness and moisture content). By adjusting the angle of the guide vane, the landing point and elevation of the mixture on the joint surface can be controlled, allowing it to fall more precisely into the specified height required for "stepped stratification". By adjusting the opening of the guide vane, the flow rate of the mixture flowing to the joint per unit time can be controlled, matching it with the working rate of the lateral compaction mechanism, avoiding excessive accumulation or insufficient filling. This adjustable flow design transforms the feeding process from extensive to intensive, ensuring that the mixture is filled into the joint in the most ideal state and manner, making it a key auxiliary component for achieving high-quality joints.

[0013] Furthermore, the mechanism consists of a hydraulically driven high-frequency vibratory compactor and a mounting arm. The hydraulic drive provides strong and easily controllable power, meeting the power response and stability requirements of high-frequency vibration. The mounting arm securely connects the high-frequency vibratory compactor to the joint side of the main frame, ensuring its stability during paving. More importantly, the position of the compactor can be finely adjusted forward / backward and vertically relative to the joint surface. The forward / backward adjustment function allows the operator to precisely control the distance between the working surface of the compactor and the vertical section of the paved layer, thereby adjusting the lateral pressure on the filler mixture. The vertical adjustment function allows the compaction mechanism to cover the entire area from the bottom to the top of the joint, ensuring uniform and sufficient lateral compaction throughout the entire joint depth. This adjustability allows the equipment to adapt to different paving thicknesses, joint conditions, and material properties, ensuring the universality and effectiveness of the process and providing mechanical assurance for achieving precise compaction.

[0014] Furthermore, the working surface shape of the high-frequency vibratory compactor is defined, offering two options: a vertical plane or an inclined plane at a 0-15 degree angle to the vertical plane. The vertical plane is the most straightforward design, with its working surface parallel to the pre-treated section of the existing layer, applying pure lateral compaction force, suitable for most situations. Allowing a slight inclination angle of 0-15 degrees represents a more optimized design consideration. A slightly backward-sloping working surface (i.e., slightly offset backward from the existing layer at the top) can generate a small, downward component force on the newly filled mix while applying lateral compaction force. This downward component helps to promote initial pre-compaction of the mix during lateral interlocking, particularly beneficial for the compaction of the area above the joint. This design enhances the overall compaction effect of the mix and may help further reduce the settlement difference between the joint area and the main layer after final compaction. The choice of angle needs to be determined experimentally based on the type of mixture and the paving thickness, but the range is limited to within 15 degrees in order to ensure that the lateral compaction force is always the dominant force and to avoid changing the main direction of the force due to an excessively large angle.

[0015] Furthermore, the introduction of an intelligent control system significantly enhances the equipment's intelligence level and the stability of construction quality. Water-stabilized mixtures come in various types (such as cement-stabilized crushed stone and secondary stabilized soil), and their optimal construction parameters (such as the secondary auger speed and lateral compaction frequency) vary depending on factors like aggregate gradation, cement content, and moisture content. The core value of the intelligent control system lies in its ability to store and recall pre-set and validated parameter sets for different mixtures. Before actual construction, the operator only needs to select the currently used water-stabilized mixture model on the control interface, and the system will automatically recall the corresponding preset parameters, control the secondary auger feeder to operate at the optimal speed, and set the vibration frequency of the lateral compaction mechanism. This avoids the uncertainty and human error caused by relying entirely on operator experience for manual adjustments, ensuring that joint construction can be carried out with optimal parameters regardless of time or place, as long as the same material is used. This not only guarantees the stability and reproducibility of joint quality but also reduces excessive reliance on operator skill levels, improving construction efficiency and quality control.

[0016] Furthermore, from the perspective of final engineering quality, quantified performance indicators are proposed for the longitudinal joints formed using this process. These indicators serve as an objective standard for evaluating whether the "zero segregation" goal has been truly achieved. It explicitly stipulates that the coefficients of variation for the three key performance parameters at the joint—aggregate gradation, density, and unconfined compressive strength—should be less than 5% compared to the main ply. The coefficient of variation is the ratio of the standard deviation to the mean, a statistical measure of data dispersion. A coefficient of variation less than 5% means that the gradation (reflecting material uniformity), density (reflecting compaction quality), and unconfined compressive strength (reflecting mechanical properties) of the joint area are highly similar to the corresponding values ​​of the main ply, with almost no statistically significant differences. This indicates that, through the aforementioned process and equipment, the traditionally weak link of the longitudinal joint has been successfully strengthened to the same performance level as the main ply. This claim, starting from a results-oriented perspective, provides a solid and measurable quality endorsement for the effectiveness of the process and equipment of this invention, demonstrating its ability and value in solving practical engineering problems.

[0017] This invention provides a construction process and equipment for zero segregation at longitudinal joints in water-stabilized paving, which has the following beneficial effects: 1. Effectively ensures material uniformity and structural density at longitudinal joints. This process pre-treats the side sections of the paved joints to create a solid, vertical working surface, providing a stable foundation for subsequent filling. The anti-segregation feeding system uses a stepped, layered approach to deliver the mixture. First, it densely fills the bottom of the joint, then fills the upper part layer by layer from bottom to top. This sequence avoids segregation phenomena such as coarse aggregate rolling off or fine aggregate accumulating under gravity. Simultaneously, the high-frequency compaction (vibration frequency 40-70 Hz) of the lateral compaction mechanism applies lateral forces parallel to the pavement plane, causing the new and old materials to interlock at the microscopic level, rather than relying solely on vertical pressure. This results in the aggregate gradation and density at the joint being consistent with the height of the main pavement, with a coefficient of variation of less than 5%, thereby eliminating weak areas at the joint, improving the overall uniformity and deformation resistance of the water-stabilized layer, and extending the service life of the road.

[0018] Significantly improves the compressive strength and durability of the joint area. Because the high-frequency vibration compaction force of the lateral compaction mechanism is perpendicular to the paving direction and parallel to the joint surface, this lateral compression forces the new mixture into the vertical cross-section of the existing layers, creating a mechanical interlocking effect. Combined with stepped layering, the mixture is gradually compacted from bottom to top, avoiding the formation of voids or loose layers. The claims explicitly state that the unconfined compressive strength at the joint has a coefficient of variation of less than 5% with the main ply, indicating that the joint area not only has uniform density but also meets the main ply standard in terms of mechanical strength. This effectively resists vehicle loads and water erosion, reduces common joint cracking or settlement problems, and enhances the long-term service performance of the water-stabilized layer.

[0019] Optimize construction processes to improve work efficiency and consistency. This equipment integrates an anti-segregation feeding system and a lateral compaction mechanism into the paver, achieving simultaneous filling and compaction. The secondary auger feeder rotates at a lower speed than the main auger and, combined with adjustable guide vanes, precisely controls the flow rate and trajectory of the mixture towards the joints, avoiding uncertainties caused by manual intervention. The intelligent control system can store preset parameters for different mixtures and automatically adjust the secondary auger speed and compaction frequency, standardizing process parameters. This not only reduces the need for multiple compaction or repair steps in traditional construction but also reduces reliance on manual skills, thereby accelerating paving progress and ensuring the consistency and repeatability of joint quality across different road sections or batches.

[0020] To fundamentally reduce material segregation and ensure the integrity of the gradation. The anti-segregation feeding system employs a coordinated design of main and auxiliary spirals. The auxiliary spiral, specifically designed for the joint side, rotates at low speed to minimize disturbance to the mixture, while guide plates further guide the mixture smoothly into the joint area. A stepped, layered filling method ensures the mixture maintains stable gradation throughout the conveying process, with coarse and fine aggregates evenly distributed, preventing segregation caused by free fall. High-frequency lateral compaction, through vibration during the compaction stage, rearranges the mixture particles, further bridging gradation differences. This multi-stage control ensures the aggregate gradation variation coefficient at the joint is less than 5%, meaning material segregation is minimized, thereby improving the overall mechanical properties and impermeability of the water-stabilized layer.

[0021] Enhances the adhesion of joint interfaces and improves the overall integrity of the road surface. The process emphasizes pretreatment of the cross-section of the joints between existing layers to create a solid, vertical working surface, providing a clean and firm base for the new material infill. High-frequency compaction (40-70 Hz) by the lateral compaction mechanism generates continuous lateral force, causing the new mixture to tightly interlock with the existing layers at the interface, rather than simply adhering. This mechanical interlocking, combined with the material's own adhesive strength, significantly improves the shear resistance at the joint. After final leveling and compaction, the joint and the main ply form a continuous and uniform whole. Data with a coefficient of variation of less than 5% proves that there is no significant difference in interface performance, thereby reducing stress concentration at the joint, preventing misalignment or delamination during use, and improving pavement smoothness and safety. Attached Figure Description

[0022] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of the double-helix anti-segregation paver of the present invention; Figure 2 This is a flowchart illustrating the overall construction process for zero segregation at longitudinal joints in water-stabilized paving according to the present invention. Figure 3 This is a detailed flowchart of the stepped and layered feeding process of the present invention; Figure 4 This is a flowchart illustrating the operation of the double-helix anti-segregation paver of the present invention. Figure 5 This is a flowchart for verifying the joint quality of the present invention. Detailed Implementation

[0024] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses consistent with some aspects of this disclosure as detailed in the appended claims.

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0026] Example 1: Application of zero segregation technology at longitudinal joints in water-stabilized paving in highway base course construction In the construction of a water-stabilized crushed stone base course for a highway, the process described in claim 1 was adopted to eliminate segregation at longitudinal joints. First, the construction workers pre-treated the joint side sections of the paved layers, using a small milling machine to remove the loose parts, forming a solid, vertical working surface. Then, a double-helix anti-segregation paver with lateral compaction function was positioned, ensuring the anti-segregation feeding system 5 and the lateral compaction mechanism 6 were precisely aligned with the joint surface. After starting the equipment, the anti-segregation feeding system 5 operated in a stepped, layered manner: the mixture was first conveyed to the bottom of the joint, filling and compacting the lower area, and then layer by layer filling the upper space upwards, ensuring no voids. Simultaneously, the high-frequency vibratory compaction plate 61 of the integrated lateral compaction mechanism 6 laterally compacted the filling mixture at a frequency of 50Hz, with the force parallel to the paving plane and perpendicular to the direction of travel, ensuring a tight interlocking of the new and old materials under lateral force. Finally, after leveling with a conventional screed 4 and final compaction with a road roller, the joint was smooth and uniform, with no aggregate segregation. This process effectively improves the quality of joints and increases construction efficiency by 20% compared to traditional methods.

[0027] Example 2: Specific Implementation of Stepped Layered Filling Method in Joint Treatment of Water-Stabilized Layer in Municipal Roads In a municipal road project, the longitudinal joints of the water-stabilized pavement were constructed using the stepped layering method described in claim 2. Before construction, the surface of the paved joints was manually roughened to form a vertical cross-section. During paving, the anti-segregation feeding system 5 of the double-spiral anti-segregation paver was activated, with its secondary spiral feeder 52 driven independently at a low speed. The mixture was first guided by the guide plate 53 and concentratedly conveyed to the bottom of the joint, then filled layer by layer from bottom to top: the first layer of mixture was filled to a height of about 5cm, and after preliminary compaction, the second layer of mixture was filled to a height of 10cm, and so on in a stepped manner from bottom to top until the joint area was completely filled. This layering method avoids segregation of the mixture in the vertical direction, ensuring that the bottom is dense and the top is uniform. At the same time, the high-frequency vibrating tamping plate 61 of the lateral compaction mechanism 6 simultaneously laterally compacts each layer during filling, with the vibration frequency set to 45Hz, so that the new material and the old material are tightly bonded under lateral force. Post-construction testing showed that the density at the joints was consistent with that of the main ply, with no weak points.

[0028] Example 3: Optimized application of high-frequency lateral compaction technology in water-stabilized joints of bridge approach roads In the construction of a water-stabilized crushed stone base course for a bridge approach, the high-frequency lateral compaction process described in claim 3 was adopted to address the compaction requirements of longitudinal joints. During construction, the integrated lateral compaction mechanism 6 of the double-helix anti-segregation paver was adjusted to the working position, and its high-frequency vibrating compaction plate 61 was fixed by the mounting arm 62, with the working surface at a 10-degree angle to the vertical plane to facilitate the flow of the mixture. The vibration frequency of the compaction plate 61 was set to 60Hz, and the direction of the force was strictly parallel to the pavement plane and perpendicular to the paver's forward direction. During the conveying of the mixture by the anti-segregation feeding system 5, the compaction plate 61 continuously vibrated at high frequency in the joint area, causing the new mixture to be continuously squeezed into the existing pavement during filling, forming an interlocking structure. Field tests showed that this frequency range (40-70Hz) effectively prevented aggregate breakage while improving compaction. After final compaction, the coefficient of variation of the unconfined compressive strength at the joint was less than 3%, meeting the high standard requirements.

[0029] Example 4: Equipment Operation Case of Double-Helix Anti-Segregation Paver in Water-Stabilized Layer Construction of Mountain Highways In the paving of water-stabilized layers for mountainous highways, the double-spiral anti-segregation paver described in claims 4 to 9 is used for longitudinal joint construction. This equipment includes a main frame 1, a power system 2, a hopper 3, a conventional screed 4, and key components such as an anti-segregation feeding system 5 and an integrated lateral compaction mechanism 6. During construction, the equipment is positioned along the joint side. The auxiliary spiral feeder 52 of the anti-segregation feeding system 5 operates independently at 70% of the rotation speed of the main spiral feeder 51. The guide plate 53 at the outlet is adjusted to a 30-degree opening to control the precise flow of the mixture towards the joint. Simultaneously, the high-frequency vibrating compaction plate 61 of the lateral compaction mechanism 6 is finely adjusted via the mounting arm 62, ensuring its working surface is 5cm from the joint surface, and lateral compaction is performed at a frequency of 55Hz. The intelligent control system calls preset parameter sets to adjust the auxiliary spiral speed and vibration frequency for the water-stabilized crushed stone mixture, achieving automated operation. Throughout the process, the equipment operates smoothly, the joint is filled evenly, and there is no segregation, improving the construction quality in complex mountainous terrain.

[0030] Example 5: Quality verification of the zero-segregation process at longitudinal joints in airport runway base course In a water-stabilized base course project for an airport runway, the longitudinal joints were treated using the process described in claims 1 to 3, and quality verification was conducted according to claim 10. During construction, after pretreatment, the joint area was filled and compacted using the anti-segregation feeding system 5 and the lateral compaction mechanism 6 of the paver. After completion, on-site sampling and testing of joint performance were performed: aggregate gradation analysis showed that the gradation curve at the joint was consistent with that of the main ply, with a coefficient of variation of 2.3%; density testing using the sand cone method showed that the average density at the joint was 2.35 g / cm³, with a coefficient of variation of 1.8% compared to the main ply; in the unconfined compressive strength test, the joint specimen strength was 4.5 MPa, with a coefficient of variation of less than 4%. All indicators had coefficients of variation below 5%, demonstrating excellent joint quality and meeting the high standards required for airport runways. This process ensures the integrity and durability of the runway base course and reduces maintenance requirements.

[0031] 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. Construction technology and equipment for zero segregation at longitudinal joints of water-stabilized paving, characterized by: Includes the following steps: The side sections of the paved joints are pretreated to form a solid and vertical working surface. A paving device with lateral compaction function is used. The anti-segregation feeding system of the device is aligned with the lateral compaction mechanism of the joint surface. The device is started, and the anti-segregation feeding system delivers and fills the new mixture into the joint area in a stepped and layered manner. At the same time, the lateral compaction mechanism performs high-frequency lateral compaction on the filling mixture, so that the new and old materials are tightly interlocked under lateral force. Finally, after leveling and final compaction, a longitudinal joint with zero segregation is formed.

2. The construction technology and equipment for zero segregation at longitudinal joints of water-stabilized paving according to claim 1, characterized in that: The "step-by-step layering method" refers to the following: the mixture is first conveyed and densely filled at the bottom of the joint, and then the mixture is layered and filled in the upper space of the joint from bottom to top.

3. The construction technology and equipment for zero segregation at longitudinal joints of water-stabilized paving according to claim 1, characterized in that: The "high-frequency lateral compaction" refers to vibration compaction in which the force is parallel to the pavement plane and perpendicular to the direction of the paver's movement, with a vibration frequency range of 40-70 Hz.

4. A double-helix anti-segregation paver implementing the process described in any one of claims 1 to 3, characterized in that: It includes a main frame (1), a power system (2), a hopper (3), a conventional ironing plate (4), and a specially designed anti-segregation feeding system (5) and an integrated lateral compaction mechanism (6).

5. The double-helix anti-segregation paver according to claim 4, characterized in that, The anti-segregation feeding system (5) includes: a main screw feeder (51) and an independent driven auxiliary screw feeder (52) located on the joint side, wherein the rotational speed of the auxiliary screw feeder (52) is lower than that of the main screw feeder (51).

6. The double-helix anti-segregation paver according to claim 5, characterized in that: At the outlet of the secondary screw feeder (52), there is a guide plate (53) with adjustable angle and opening, which is used to control the trajectory and flow rate of the mixture towards the joint.

7. The double-helix anti-segregation paver according to claim 4, characterized in that: The integrated lateral compaction mechanism (6) includes a hydraulically driven high-frequency vibratory compaction plate (61) and an mounting arm (62). The high-frequency vibratory compaction plate (61) is fixed to the joint side of the main frame (1) by a mounting arm (62), and its position can be finely adjusted back and forth and up and down relative to the joint surface.

8. The double-helix anti-segregation paver according to claim 7, characterized in that, The working surface of the high-frequency vibration compaction plate (61) is a vertical plane or an inclined plane with an angle of 0-15 degrees to the vertical plane.

9. The double-helix anti-segregation paver according to claim 4, characterized in that, It also includes an intelligent control system that can store and recall preset parameter sets for different water-stabilized mixtures to control the rotation speed of the auxiliary screw feeder and the vibration frequency of the lateral compaction mechanism.

10. The construction technology and equipment for zero segregation at longitudinal joints of water-stabilized paving according to claim 1, characterized in that: The longitudinal joint is formed by the process described in any one of claims 1 to 3, and the aggregate gradation, density and unconfined compressive strength at the joint have a coefficient of variation of less than 5% compared with the main ply.

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