Cement stabilized macadam base longitudinal joint extrusion compaction tool and method

Abstract

The application discloses a cement stabilized macadam base longitudinal joint extrusion compaction tool and method, and relates to the technical field of road construction. The tool comprises a back plate, one side of the back plate is provided with an extrusion bearing plate for abutting a first cement stabilized base loose mixture area edge joint vertical surface, the other side is provided with a guide operation plate inclined towards a second cement stabilized base paving area, the inside of the back plate is provided with multiple groups of high-frequency vibration generating devices, the excitation end of the high-frequency vibration generating devices is abutted to the back of the guide operation plate, and the non-excitation end is connected to the extrusion bearing plate. The application forms cooperation between the force directional conversion of the guide operation plate and the drag reduction of the high-frequency vibration device, converts the longitudinal pushing force of the paver into longitudinal joint transverse extrusion force, solves the defects of no effective transverse compaction of the longitudinal joint in the traditional process and easy displacement of the baffle, realizes synchronous extrusion and vibration compaction of the longitudinal joint in the paving process, and improves the joint compactness and structural stability.

Description

Technical Field

[0001] This invention relates to the field of road construction technology, specifically to a tool and method for compacting longitudinal joints in cement-stabilized crushed stone base courses. Background Technology

[0002] Cement-stabilized crushed stone base course is the core semi-rigid load-bearing structure of a road, and its construction quality directly determines the overall load-bearing capacity and service life of the pavement. Due to the limitation of the rated operating width of a single paver, the construction of large-area cement-stabilized crushed stone base courses generally adopts a slab paving process. The treatment of the longitudinal joint between two paving strips is a key aspect of base course construction quality control.

[0003] To mitigate longitudinal joint quality risks from the outset, a hot-joint construction technique is often employed in engineering projects, using two pavers operating in a staggered formation with overlapping longitudinal sections of the paving strip. However, this technique is constrained by multiple factors, including equipment configuration, construction costs, batching plant capacity, material transportation capacity, and on-site operating space, preventing its widespread adoption in various engineering scenarios. Therefore, single-machine slab paving remains a common construction method in domestic road and road infrastructure projects, and the accompanying longitudinal joint treatment process directly determines the formation quality and long-term service performance of the base course.

[0004] Currently, the mainstream construction process for longitudinal joints in single-machine paving is as follows: After the first section of the mixture is paved, during the compaction operation, a 0.3-0.5m wide section of the mixture is left uncompacted at the edge where the two sections meet. After being manually trimmed into a vertical joint surface, square timber or sheet metal baffles are used to fix the joint surface. After the second section of the mixture is paved, the baffles are manually removed, and then a road roller is used to compact the mixture across the joint from one side of the second section to complete the longitudinal joint formation.

[0005] This process has the following drawbacks: 1. The compaction effect of traditional road rollers is mainly based on vertical downward loads. Whether it is static compaction or vibratory compaction, it is impossible to apply effective lateral compressive force to the mixture at the longitudinal joints. This defect directly leads to the inability of the mixture at the joints to form a tight interlocking structure between aggregates. The density is significantly lower than that of the main base area, inevitably forming a weak zone. Under the repeated action of traffic loads in the later stage, as well as the dual effects of thermal shrinkage and drying shrinkage stress of cement-stabilized crushed stone itself, this weak zone is prone to develop into longitudinal cracks that run through the entire base, eventually causing early damage such as pavement pumping and subsidence.

[0006] 2. During the second phase of the asphalt paving process, the paver's spiral feeding and continuous movement will generate dynamic loads on the baffles with unpredictable directions. The conventional timber and sheet metal baffles used in engineering can only achieve simple material blocking without a reliable limiting and fixing structure. Under dynamic loads, they are prone to tilting or shifting. To avoid this problem, a dedicated person must be assigned to monitor the process throughout and correct and reset it at any time, which significantly increases the on-site labor input.

[0007] 3. The square timber and sheet metal baffles used in the process only have the function of passively blocking materials and cannot actively improve the density of the mixture at the joints. Summary of the Invention

[0008] This invention proposes a tool and method for compacting longitudinal joints in cement-stabilized crushed stone base courses, in order to solve at least one technical problem existing in the prior art.

[0009] To achieve the above objectives, the present invention provides a longitudinal joint extrusion and compaction tool for cement-stabilized crushed stone base course, including a backing plate, one side of which is provided with an extrusion bearing plate for fitting the joint facade of the edge of the reserved loose mixture area of ​​the first cement-stabilized base course. On the other side of the back plate is a guide plate, which is inclined from top to bottom toward the second water-stabilized base paving area. It is used to convert the longitudinal thrust of the paver into a transverse extrusion force pointing toward the longitudinal joint. The backing plate is equipped with multiple sets of high-frequency vibration generating devices. The excitation end of the high-frequency vibration generating device is attached to the back of the guide plate, and its non-excitation end is connected to the extrusion bearing plate.

[0010] Preferably, the extrusion bearing plate is a vertical and flat rigid panel, and the guide plate is an inclined and flat rigid panel. The extrusion bearing plate and the guide plate are integrally bent to form the main structure of the backing plate.

[0011] Preferably, the angle between the guide plate and the extrusion bearing plate is 10°~15°.

[0012] Preferably, the backing plate is a modular splicing structure, which is spliced ​​together from multiple standard segments; the extruded load-bearing plate and guide plate of a single standard segment are integrally bent and formed, and the splicing joints of adjacent standard segments are connected by a sealed butt joint stop. After splicing, the surfaces of the extruded load-bearing plate and guide plate of each standard segment are flush.

[0013] Preferably, the backing plate has a bracket perpendicular to the guide plate inside, and a high-frequency vibration generator is connected to the bracket. Its excitation end is close to the back of the guide plate, and the non-excitation end is rigidly connected to the extrusion bearing plate through the bracket. Multiple sets of high-frequency vibration generators are arranged at intervals along the length of the backing plate.

[0014] Preferably, a preset gap is provided between the bottom of the main structure of the backing plate and the underlying layer, and the total height of the backing plate is the same as the designed compaction thickness of the cement-stabilized crushed stone base layer.

[0015] Preferably, the lower edge of the guide plate is hinged with a guide skirt; in the working state, the guide skirt is in contact with the surface of the underlying layer; in the evacuation state, the guide skirt automatically flips over to avoid the mixed material.

[0016] This invention also provides a method for compacting longitudinal joints of a cement-stabilized crushed stone base course, the method being implemented using the aforementioned cement-stabilized crushed stone base course longitudinal joint compaction tool, and comprising the following steps: S1. Complete the laying and main compaction of the first water-stabilized base course, and set a reserved loose mixture area at its joint, and trim the edge of the reserved loose mixture area into the joint facade. S2. Position the extrusion and compaction tool at the longitudinal joint position, so that the extrusion bearing plate of the backing plate is in contact with the joint vertical surface, and the guide plate of the backing plate is inclined from top to bottom towards the second water-stabilized base paving area. S3. Start the high-frequency vibration generator inside the back plate, and drive the guide plate to generate high-frequency vibration through its excitation end to carry out the second water-stabilized base course paving operation; during the paving process, the longitudinal thrust of the paver is converted into the transverse extrusion force pointing towards the longitudinal joint through the inclined guide plate, and at the same time, the high-frequency vibration improves the performance of the mixture material, so that the mixture paved in the second water-stabilized base course paving area is tightly embedded with the reserved loose mixture area of ​​the first water-stabilized base course under the action of transverse extrusion force; S4. After the paving operation is completed, turn off the high-frequency vibration generator and remove the extrusion compaction tool to complete the overall rolling and shaping of the second water-stabilized base course and longitudinal joint.

[0017] Preferably, in step S1, the width of the reserved loose mixture area along the transverse direction is 0.3m to 0.5m, and the repaired joint facade is a flat facade perpendicular to the underlying layer; in step S2, after the extrusion compaction tool is positioned, the guide skirt hinged to the lower edge of the guide working plate is adjusted to fit against the surface of the underlying layer, sealing the preset gap of no more than 2cm between the bottom of the guide working plate and the underlying layer.

[0018] Preferably, in step S3, when the paver of the second water-stabilized base course is 5m to 10m away from the section where the compaction tool is located, the high-frequency vibration generator is started in advance; in step S4, when the compaction tool is removed, it is hoisted obliquely upward along the direction parallel to the guide plate surface. The removal work is completed before the initial setting of the second cement-stabilized crushed stone mixture. After removal, the longitudinal joint is statically compacted once, and then the second water-stabilized base course and the joint are vibrated and compacted at least three times.

[0019] This invention addresses the core technical problems of existing longitudinal joint construction by combining an inclined guide plate with a high-frequency vibration generator. The specific technical effects are as follows: 1. High-frequency vibration causes the mixture in close contact with the guide plate to produce a "temporary liquefaction" effect, which simultaneously reduces the frictional resistance and interfacial contact resistance within the mixture. The inherent propulsion force of the paver can be efficiently converted into lateral extrusion force acting on the longitudinal joint, solving the core problem that traditional road rollers can only apply vertical loads and cannot effectively compact the mixture in the longitudinal joint.

[0020] 2. High-frequency vibration causes the mixture particles to rearrange and expel internal air, completing the initial compaction in advance and greatly improving the fluidity of the mixture; the lateral extrusion force of the guide plate can smoothly push the fluidized mixture into the reserved loose mixture area of ​​the first water-stabilized base layer, so that the two base layer mixtures form a tight aggregate interlocking structure within the full thickness of the longitudinal joint, realizing the simultaneous completion of material blocking and active compaction.

[0021] 3. High-frequency vibration keeps the mixture near the guide plate in a plastic flow state, eliminating the impact between the mixture and the guide plate. The paver's propulsion force can be smoothly and continuously converted into lateral extrusion force. With the stable support structure formed by the guide plate and the extrusion bearing plate, there is no risk of the tool tilting or shifting during the entire paving process. No special personnel are required to monitor and correct it throughout the process. It is fully compatible with the regular construction rhythm of existing pavers and does not require equipment modification or additional procedures.

[0022] 4. After removing this tool diagonally upwards in a direction parallel to the guide plate, the plastic mixture will automatically fill the space originally occupied by this tool. At the same time, the ongoing paving and compaction operations will generate forward and lateral micro-flow pressure on the overall mixture, filling the space originally occupied by this tool. Attached Figure Description

[0023] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0024] Figure 1 This is a schematic diagram of the cooperation structure between a cement-stabilized crushed stone base longitudinal joint extrusion compaction tool and the first water-stabilized base layer according to the present invention.

[0025] Figure 2 This is a schematic diagram of the first cross-section of a water-stabilized base course.

[0026] Figure 3 This is a schematic diagram of an embodiment of a cement-stabilized crushed stone base longitudinal joint extrusion and compaction tool according to the present invention.

[0027] Figure 4 This is a schematic diagram of another embodiment of the longitudinal joint extrusion and compaction tool for cement-stabilized crushed stone base layer according to the present invention.

[0028] Explanation of reference numerals in the attached figures: 1. Backing plate; 11. Extrusion bearing plate; 12. Guide working plate; 13. Guide skirt plate; 14. Support frame; 15. Adjustable support leg; 16. Lifting ring; 17. Connecting plate; 2. High-frequency vibration generator; 3. First water-stabilized base layer; 31. Reserved loose mixture area; 311. Joint facade; 32. Compacted forming area; 4. Second water-stabilized base layer paving area; 5. Subbase layer; 6. Pre-set gap. Detailed Implementation

[0029] The following is in conjunction with the appendix Figure 1 -Appendix Figure 4 The technical solutions in the embodiments of this application are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0030] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0031] Furthermore, the use of terms such as "first," "second," etc., in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0032] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0033] Furthermore, the technical solutions of the various embodiments of this application can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this application.

[0034] This invention provides a tool for compacting longitudinal joints in a cement-stabilized crushed stone base course, comprising a backing plate 1, with a compression bearing plate 11 on one side of the backing plate 1 for fitting the joint facade 311 of the edge of the pre-reserved loose mixture area 31 of the first cement-stabilized base course 3; a guide plate 12 is provided on the other side of the backing plate 1, the guide plate 12 is inclined from top to bottom toward the paving area 4 of the second cement-stabilized base course, for converting the longitudinal thrust of the paver into a transverse extrusion force pointing toward the longitudinal joint; multiple sets of high-frequency vibration generating devices 2 are provided inside the backing plate 1, the excitation end of the high-frequency vibration generating device 2 is attached to the back of the guide plate 12, and its non-excitation end is connected to the compression bearing plate 11.

[0035] This tool achieves its operation through the coordinated cooperation of the guide plate 12 and the high-frequency vibration generator 2. The specific working principle of their coordinated operation is as follows: 1. The working principle of transverse extrusion force conversion: When the inclined guide plate 12 is set up alone, it can decompose the longitudinal thrust of the paver along the paving direction into a transverse component perpendicular to the longitudinal joint direction through the inclined structure. However, due to the characteristics of the cement-stabilized crushed stone mixture itself, the aggregate interlocking effect inside the mixture is strong and the internal friction coefficient is large when it is not vibrating. At the same time, there is a large contact friction resistance between the mixture and the inclined interface of the guide plate 12. More than 70% of the longitudinal thrust output by the paver will be consumed by the above two types of friction resistance, which cannot form a stable and effective transverse extrusion force and makes it difficult to achieve transverse compaction of the mixture in the longitudinal joint.

[0036] When the high-frequency vibration generator 2 is set up alone, it can reduce the frictional resistance of the mixture through high-frequency excitation, but it cannot provide directional lateral extrusion force for the mixture. The excitation force can only achieve in-situ compaction of the mixture and cannot push the mixture to move directionally in the longitudinal direction, thus failing to solve the core problem of traditional processes lacking effective lateral compressive force.

[0037] When the two work together, the high-frequency vibration generator 2 outputs high-frequency excitation force in a direction perpendicular to the guide plate 12, causing the mixture that is in close contact with the inclined surface of the guide plate 12 to produce a "temporary liquefaction" effect. The interlocking of aggregates inside the mixture is greatly reduced, and the internal friction coefficient can be reduced to 0.2~0.3. At the same time, the interface contact resistance between the mixture and the inclined surface of the guide plate 12 is reduced by more than 90%. At this time, the inherent longitudinal thrust output by the paver can be converted into an effective lateral compressive force acting on the longitudinal joint mixture through the inclined surface structure of the guide plate 12 with high efficiency, achieving "small thrust, large compressive effect". This fundamentally solves the technical problem that traditional road rollers can only apply vertical loads and cannot form effective lateral compaction of the longitudinal joint mixture. 2. The synergistic working principle of longitudinal joint interlocking and compaction: When relying solely on the guide plate 12, it can apply transverse extrusion force to the mixture through the inclined structure. However, due to the poor fluidity of the unvibrated mixture, the transverse extrusion force can only be applied to the mixture with a thickness of 5-10cm. It cannot push the mixture with a larger thickness into the bottom of the longitudinal joint, making it difficult to form a dense structure in the full thickness range of 15-30cm of the water-stabilized base course. It cannot solve the problem of insufficient compaction at the bottom of the longitudinal joint. At the same time, the guide plate 12 can only play a passive role in blocking the material and cannot actively improve the density of the mixture at the joint.

[0038] When relying solely on the high-frequency vibration generator 2, it can achieve in-situ compaction of the mixture through high-frequency excitation, causing the mixture particles to rearrange and expel internal air. However, it cannot provide the mixture with directional extrusion force pointing towards the longitudinal joint, cannot push the mixture to move towards the edge 31 of the reserved loose mixture area of ​​the first water-stabilized base layer 3, and cannot achieve mutual interlocking of the two base layer mixtures. A structurally weak zone will still be formed at the longitudinal joint.

[0039] When the two work together, the high-frequency vibration generator 2 outputs high-frequency excitation force, which first causes the mixture particles at the inclined surface of the guide plate 12 to rearrange and expel internal air, completing the initial side compaction of the mixture before the lateral extrusion force is applied, and at the same time greatly improving the fluidity of the mixture. Subsequently, the lateral extrusion force generated by the guide plate 12 can smoothly push the mixture with greatly improved fluidity into the reserved loose mixture area 31 of the first water-stabilized base course 3, so that the mixture in the second water-stabilized base course paving area 4 and the reserved loose mixture area 31 of the first water-stabilized base course 3 form a continuous and tight aggregate interlocking structure within the full thickness range of 15~30cm of the longitudinal joint. This completely makes up for the technical shortcoming of traditional road rollers that can only compact vertically and cannot achieve lateral compaction of a large thickness of longitudinal joint. At the same time, it upgrades the backing plate 1 from a single passive material blocking component to an integrated working component with both material blocking and active compaction functions, realizing the simultaneous completion of material blocking and active compaction.

[0040] 3. The working principle of operational stability: When the guide plate 12 is used alone as the material blocking structure, the unvibrated cement-stabilized crushed stone mixture is hard and has poor fluidity. When the paver travels at a conventional speed of 1~2m / min and the auger spreader continuously distributes the material, intermittent "stuttering-deadlocking-impact" load changes are likely to occur between the mixture and the inclined surface of the guide plate 12. The peak value of a single impact load can reach 3~5 times the stable load, which can easily cause the backing plate 1 to tilt or shift, making it impossible to ensure the straightness of the longitudinal joint line.

[0041] When the high-frequency vibration generator 2 is used alone, there is no stable rigid support structure, so it cannot provide stable material blocking and limiting for the mixture during the paving process. It cannot replace the material blocking function of the traditional baffle and still cannot solve the problem of tool displacement during the paving process.

[0042] When the two work together, the continuous excitation force output by the high-frequency vibration generator 2 keeps the mixture at the inclined surface of the guide plate 12 in a plastic flow state throughout the process. The contact resistance between the mixture and the inclined surface is stable and without sudden changes, completely eliminating the load fluctuation of "stuttering-impact". The longitudinal thrust output by the paver can be smoothly and continuously converted into lateral extrusion force. At the same time, in conjunction with the rigid support structure formed by the guide plate 12 and the extrusion bearing plate 11, the extrusion bearing plate 11 is closely attached to the joint surface of the first water-stabilized base course 3 to form a reverse support, so that the backing plate 1 remains stable in position throughout the paving process, without the risk of tilting or displacement. There is no need to arrange a dedicated person to monitor the process and correct and reset it at any time, which significantly reduces the on-site labor input and construction management costs.

[0043] To ensure the overall robustness of the main structure of the backrest 1, and to ensure a seamless connection between the extrusion bearing plate 11 and the guide working plate 12, thereby preventing panel deformation and cracking at the joints during use, and to ensure the smooth transmission of extrusion and vibration forces, as a preferred embodiment, a further improvement of the present invention is that the extrusion bearing plate 11 is a vertically flat rigid panel, and the guide working plate 12 is an inclined flat rigid panel. The extrusion bearing plate 11 and the guide working plate 12 are integrally bent to form the main structure of the backrest 1.

[0044] The extrusion bearing plate 11 and the guide working plate 12 are integrally formed by bending the same rigid steel plate, directly forming the main body of the backing plate 1. No welding or bolt connection is required. The specific processing process is as follows: ordinary high-strength steel plate is selected as raw material. According to the construction thickness of the water-stabilized base layer, a steel plate with a thickness of 6~12mm is selected to meet the stress and seismic requirements during construction. The same steel plate is directly bent into an angle using bending equipment to form the extrusion bearing plate 11 and the guide working plate 12. The angle between the two is controlled at 10°~15° to ensure that the extrusion pressure can be effectively converted later. After bending, the two panels are leveled to ensure that the extrusion bearing plate (11) is vertical and flat, and can be closely attached to the joint facade 311 of the first water-stabilized base layer 3. The guide working plate 12 is tilted and flat, without obvious warping or protrusion. The main structure of the backing plate 1 after integral bending is made into standard segments of 4m or 6m according to construction requirements. The standard segments can be spliced ​​together by sealing the butt joint. When splicing, the plate surface is kept flush.

[0045] It should be noted that before bending operations, the specific included angle value should be determined within the range of 10° to 15° according to the actual construction needs. For airport runways, high-grade heavy-duty highways, etc., a slab included angle of 10° to 12° should be selected, while for conventional municipal / highway road construction, a slab included angle of 12° to 15° should be selected.

[0046] For working conditions where the base layer of airport runways and high-grade heavy-duty highways has a compaction thickness of 25cm to 36cm, the total height of the backing plate 1 is set according to the compaction thickness of the base layer. The greater the thickness of the base layer, the higher the height of the backing plate 1, the larger the contact area between the mixture and the guide plate 12, and the greater the required lateral extrusion force. In this working condition, a plate surface angle of 10° to 12° is preferred. Within this angle range, there is no need to adjust the normal operating parameters of the paver, and the propulsion force of the paver during normal operation can be converted into sufficient lateral extrusion force.

[0047] For working conditions where the base layer of conventional municipal roads and ordinary highways has a compaction thickness of 15cm to 20cm, the total height of the backing plate 1 is set according to the compaction thickness of the base layer. The smaller the base layer thickness, the lower the height of the backing plate 1, the smaller the contact area between the mixture and the guide plate 12, and the smaller the required lateral extrusion force. In this working condition, a plate surface angle of 12° to 15° is preferred. Within this angle range, there is no need to adjust the normal operating parameters of the paver, and the propulsion force of the paver during normal operation can be converted into lateral extrusion force that meets the construction requirements.

[0048] To provide a stable and rigid mounting base for the high-frequency vibration generator 2, and to ensure that the excitation force of the device can be transmitted to the guide plate 12 without loss, while achieving uniform excitation throughout the entire length of the backing plate 1, as a preferred embodiment, a further improvement of the present invention is that the backing plate 1 is provided with a bracket 14 perpendicular to the guide plate 12, the high-frequency vibration generator 2 is fixed to the bracket 14 by bolts, its excitation end is in close contact with the back of the guide plate 12, and the non-excitation end is rigidly connected to the compression bearing plate 11 through the bracket 14; multiple sets of high-frequency vibration generators 2 are arranged at equal intervals along the length direction of the backing plate 1.

[0049] Specifically, the bracket 14 is made of the same steel plate as the backing plate 1. The bracket 14 is set perpendicular to the back of the guide plate 12. One end of the bracket 14 is fully welded to the inner back of the guide plate 12, and the other end is fully welded to the inner wall of the extrusion bearing plate 11, forming an integral rigid connection with the two panels. After welding, the bracket 14 is neither loose nor deformed. Bolt holes matching the mounting holes of the high-frequency vibration generator 2 are pre-drilled on the bracket 14. The high-frequency vibration generator 2 is fixed to the bracket 14 by high-strength fastening bolts. The excitation end face of the device is completely in contact with the back of the guide plate 12, with no gaps between the contact surfaces, ensuring that the excitation force can be directly transmitted to the guide plate 12. The non-excitation end shell of the device is firmly locked to the bracket 14, forming a rigid force transmission structure through the bracket 14 and the extrusion bearing plate 11. Multiple sets of high-frequency vibration generators 2 are arranged at equal intervals along the length of the back plate 1, and the center-to-center distance between two adjacent sets of high-frequency vibration generators 2 is controlled at 50cm~80cm; the distance between the high-frequency vibration generators 2 at both ends of the back plate 1 and the end of the back plate 1 is controlled at 15cm~25cm; for a single standard section of the back plate 1 with a length of 4m, 5~7 sets of high-frequency vibration generators 2 are provided to ensure uniform vibration coverage throughout the entire section of the back plate 1.

[0050] It should be noted that the high-frequency vibration generator 2 is a small high-frequency attached vibrator, which falls within the scope of existing technology, and its specific working principle will not be elaborated here.

[0051] To ensure the levelness of the top of the backrest 1 and to adjust the overall height of the backrest 1, as a preferred embodiment, such as Figure 1 , Figure 3 As shown, a preset gap 6 is provided between the bottom of the main structure of the backing plate 1 and the lower support layer 5. Adjustable support legs 15 are respectively provided at opposite ends of the backing plate 1 along its length within the preset gap 6. A connecting plate 17 is fixedly connected between the compression bearing plate 11 and the guide working plate 12. The adjustable support legs 15 are threadedly connected to the connecting plate 17. The levelness of the top of the backing plate 1 and the overall height of the backing plate 1 can be adjusted by rotating the adjustable support legs 15.

[0052] In other embodiments, such as Figure 4As shown, the height of the backing plate 1 can be adjusted by setting pads at the bottom of the extrusion bearing plate 11 and the guide working plate 12.

[0053] To prevent the mixture from entering the preset gap 6 between the backing plate 1 and the lower support layer 5, thereby reducing the lateral compressive force on the backing plate 1, in a preferred embodiment, the lower edge of the guide working plate 12 is hinged to a guide skirt 13; in the working state, the guide skirt 13 is in contact with the surface of the lower support layer 5; in the withdrawal state, the guide skirt 13 automatically flips over to avoid the mixture.

[0054] Specifically, the guide skirt 13 is made of the same wear-resistant steel plate as the guide working plate 12, with a preferred plate thickness of 6mm to 12mm to ensure sufficient structural strength and wear resistance to withstand long-term friction and impact from cement-stabilized crushed stone mixture. The guide skirt 13 is rotatably connected to the lower edge of the guide working plate 12 via hinges. The hinges are made of stainless steel and are evenly spaced along the length of the guide working plate 12, with the spacing between adjacent hinges controlled at 30cm to 50cm to ensure a firm overall connection of the guide skirt 13 and prevent local warping or deformation under stress. In operation, the guide skirt 13 naturally droops under its own weight, completely fitting and covering the preset gap 6 between the guide working plate 12 and the lower support layer 5, forming a continuous material-blocking structure. This effectively prevents the mixture from seeping into the preset gap 6, avoids weakening of the lateral extrusion force, and ensures that the extrusion force can stably act on the longitudinal joint mixture. In the evacuation state, the tool is then hoisted diagonally upwards in a direction parallel to the guide plate 12. Under the compression of the mixture, the guide skirt 13 will automatically rotate towards the compression bearing plate 11 to prevent interference with the tool's evacuation.

[0055] This invention also provides a method for compacting longitudinal joints of cement-stabilized crushed stone base courses. This method uses the aforementioned compaction tool for longitudinal joints of cement-stabilized crushed stone base courses and includes the following steps: S1. Complete the paving of the first water-stabilized base course 3, compact its main body to form a compacted forming area 32, set a reserved loose mixture area 31 at its longitudinal connection, and trim the edge of the reserved loose mixture area 31 to form a joint facade 311; wherein, the transverse width of the reserved loose mixture area 31 is 0.3m~0.5m, and the trimmed joint facade 311 is a flat facade perpendicular to the underlying layer 5.

[0056] S2. The extrusion and compaction tool is hoisted and positioned at the longitudinal joint design position, so that the extrusion bearing plate 11 of the backing plate 1 is tightly attached to the joint facade 311. The guide working plate 12 of the backing plate 1 is inclined from top to bottom towards the second water-stabilized base paving area 4. After the tool is positioned, the guide skirt plate 13 hinged to the lower edge of the guide working plate 12 is attached to the surface of the lower support layer 5 under its own weight, completely sealing the preset gap 6 of no more than 2cm between the bottom of the guide working plate 12 and the lower support layer 5.

[0057] S3. When the paver of the second water-stabilized base course moves to a distance of 5m to 10m from the section where the compaction tool is located, the high-frequency vibration generator 2 inside the back plate 1 is activated in advance. The high-frequency vibration is generated by the excitation end of the device driving the guide plate 12. Then the second water-stabilized base course paving operation is carried out. During the paving process, the inclined guide plate 12 converts the longitudinal thrust of the paver into the lateral extrusion force pointing towards the longitudinal joint. At the same time, the high-frequency vibration improves the flow and interlocking performance of the mixture, so that the mixture of the second paved course is tightly interlocked with the reserved loose mixture area 31 of the first water-stabilized base course 3 under the action of the lateral extrusion force.

[0058] S4. After the second paving operation is completed, turn off the high-frequency vibration generator 2 and carry out the hoisting operation through the top lifting ring 16. The entire extrusion compaction tool is hoisted and dismantled in a direction parallel to the guide plate 12. The dismantling work is completed before the initial setting of the cement-stabilized crushed stone mixture. After the tool is dismantled, the longitudinal joint is statically pressed once, and then the second water-stabilized base layer and the longitudinal joint are vibrated and rolled at least three times to finally complete the overall forming of the base layer and the longitudinal joint.

[0059] The above description is merely a preferred embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the inventive concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included in the patent protection scope of this application.

Claims

1. A tool for compacting longitudinal joints of cement-stabilized crushed stone base course, comprising a backing plate (1), characterized in that, An extrusion bearing plate (11) is provided on one side of the backing plate (1) to fit the joint facade (311) of the edge of the loose mixture area (31) reserved in the first water-stabilized base layer (3). A guide plate (12) is provided on the other side of the back plate (1). The guide plate (12) is inclined from top to bottom towards the second water-stabilized base paving area (4) to convert the longitudinal thrust of the paver into a transverse extrusion force pointing towards the longitudinal joint. The backing plate (1) is equipped with multiple sets of high-frequency vibration generating devices (2). The excitation end of the high-frequency vibration generating device (2) is attached to the back of the guide plate (12), and its non-excitation end is connected to the extrusion bearing plate (11).

2. The cement-stabilized crushed stone base longitudinal joint extrusion compaction tool according to claim 1, characterized in that, The extrusion bearing plate (11) is a vertical and flat rigid panel, and the guide working plate (12) is an inclined and flat rigid panel. The extrusion bearing plate (11) and the guide working plate (12) are integrally bent to form the main structure of the backing plate (1).

3. The cement-stabilized crushed stone base longitudinal joint extrusion compaction tool according to claim 2, characterized in that, The angle between the guide plate (12) and the extrusion bearing plate (11) is 10°~15°.

4. The cement-stabilized crushed stone base longitudinal joint extrusion compaction tool according to claim 2, characterized in that, The backing plate (1) is a modular splicing structure, which is spliced ​​from multiple standard segments; the extrusion bearing plate (11) and guide operation plate (12) of a single standard segment are integrally bent and formed structures, and the splicing of adjacent standard segments is connected by a sealed butt joint. After the splicing is completed, the extrusion bearing plate (11) and guide operation plate (12) of each standard segment are flush.

5. The cement-stabilized crushed stone base longitudinal joint extrusion compaction tool according to claim 2, characterized in that, The backing plate (1) is equipped with a bracket (14) perpendicular to the guide plate (12). The high-frequency vibration generator (2) is connected to the bracket (14), with its excitation end close to the back of the guide plate (12) and its non-excitation end rigidly connected to the extrusion bearing plate (11) through the bracket (14). Multiple sets of high-frequency vibration generators (2) are arranged at intervals along the length of the backing plate (1).

6. The cement-stabilized crushed stone base longitudinal joint extrusion compaction tool according to claim 1, characterized in that, A pre-set gap (6) is provided between the bottom of the main structure of the backing plate (1) and the lower support layer (5). The total height of the backing plate (1) is the same as the design compaction thickness of the cement-stabilized crushed stone base layer.

7. The cement-stabilized crushed stone base longitudinal joint extrusion compaction tool according to claim 6, characterized in that, The lower edge of the guide plate (12) is hinged with a guide skirt (13); in the working state, the guide skirt (13) is attached to the surface of the lower support layer (5); in the evacuation state, the guide skirt (13) automatically flips over to avoid the mixture.

8. A method for compacting longitudinal joints of cement-stabilized crushed stone base course, characterized in that, The method is implemented using the cement-stabilized crushed stone base longitudinal joint extrusion compaction tool as described in any one of claims 1-7, and includes the following steps: S1. Complete the laying and main compaction of the first water-stabilized base course (3), and set a reserved loose mixture area (31) at its joint, and trim the edge of the reserved loose mixture area (31) into a joint facade (311). S2. Position the extrusion compaction tool at the longitudinal joint position, so that the extrusion bearing plate (11) of the backing plate (1) fits against the joint facade (311), and the guide working plate (12) of the backing plate (1) is inclined from top to bottom towards the second water-stabilized base paving area (4). S3. Start the high-frequency vibration generator (2) inside the back plate (1), drive the guide plate (12) through its excitation end to generate high-frequency vibration, and carry out the second water-stabilized base paving operation; during the paving process, the longitudinal thrust of the paver is converted into the transverse extrusion force pointing to the longitudinal joint through the inclined guide plate (12), and at the same time, the performance of the mixture material is improved through high-frequency vibration, so that the mixture paved in the second water-stabilized base paving area (4) is tightly fitted with the reserved loose mixture area (31) of the first water-stabilized base (3) under the action of transverse extrusion force; S4. After the paving operation is completed, turn off the high-frequency vibration generator (2), remove the extrusion compaction tool, and complete the overall rolling and shaping of the second water-stabilized base course and longitudinal joint.

9. The method for compacting longitudinal joints of cement-stabilized crushed stone base course according to claim 8, characterized in that, In step S1, the reserved loose mixture area (31) has a transverse width of 0.3m to 0.5m, and the repaired joint facade (311) is a flat facade perpendicular to the lower support layer (5); in step S2, after the extrusion compaction tool is positioned, the guide skirt (13) hinged to the lower edge of the guide working plate (12) is adjusted to fit with the surface of the lower support layer (5), and the preset gap (6) between the bottom of the guide working plate (12) and the lower support layer (5) of no more than 2cm is sealed.

10. The method for compacting longitudinal joints of cement-stabilized crushed stone base course according to claim 9, characterized in that, In step S3, when the paver of the second water-stabilized base course is 5m to 10m away from the section where the extrusion compaction tool is located, the high-frequency vibration generator (2) is started in advance; in step S4, when the extrusion compaction tool is removed, it is hoisted upwards in a direction parallel to the guide plate (12). The removal work is completed before the initial setting of the second cement-stabilized crushed stone mixture. After removal, the longitudinal joint is statically compacted once, and then the second water-stabilized base course and the joint are vibrated and compacted at least three times.

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