A pavement structure, repair method and construction method with self-healing function

Abstract

The present invention relates to the technical field of road traffic, and provides a road surface structure with a self-repairing function, a repair method and a construction method. The road surface structure with a self-repairing function includes a paving layer and a structural layer; the structural layer includes a sand storage cavity; the sand storage cavity can be used to store sand and gravel; sand leakage holes are distributed on the bottom surface of the structural layer; both ends of the sand leakage holes are respectively communicated with the sand storage cavity and the base layer. When using this road surface structure with a self-repairing function, when settlement and collapse occur in the base layer, under the vibration caused by the passing of upper vehicles, the sand and gravel can automatically leak out from the sand leakage holes and fill the settlement area, realizing the self-repairing function, thereby solving the problem that the existing road structure needs to be regularly excavated and repaired as a whole in order to repair the deformation caused by the settlement of the base layer, resulting in high operation and maintenance costs and hindering road traffic.

Description

Technical Field

[0001] The present invention relates to the technical field of road traffic, and in particular to a road surface structure with self-repairing function, a repairing method and a construction method. Background Art

[0002] Pavement structure is an important part of road engineering. The existing pavement structure generally includes a pavement layer, a structural layer and a base layer from top to bottom; the pavement layer is located at the top of the entire pavement structure, used to directly bear vehicle loads and environmental effects, and often uses a densely filled concrete layer or asphalt layer; the structural layer is located below the pavement layer, used to provide the road's bearing capacity and stability, and is often composed of stone, crushed stone or concrete layers; the base layer is located below the structural layer, used to support the structural layer and disperse the load transferred from the structural layer, and is often composed of gravel or gravel.

[0003] During the actual use of roads, the base of roads often undergoes local or even large-scale settlement due to various reasons, such as the settlement of soft soil foundations under the influence of heavy rain, or the settlement of frozen soil foundations due to frost heave and thaw, which causes the road surface structure to deform accordingly and has an adverse effect on the passage of vehicles above it. In order to prevent the deformation of the road surface structure from continuing to accumulate to the point where it is impassable to traffic, it is necessary to regularly carry out overall excavation repair of the road surface structure, which leads to high operation and maintenance costs of the road surface structure. At the same time, the overall excavation repair of the road itself will hinder road traffic, resulting in a large amount of economic losses. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that the existing road structure needs to be regularly excavated and repaired in order to repair the deformation caused by the settlement of the base layer, which leads to high operation and maintenance costs and hinders road traffic. A pavement structure, repair method and construction method with self-repairing function are provided.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A pavement structure with self-repairing function; comprising a pavement layer and a structural layer; the structural layer comprises a sand storage cavity; the sand storage cavity can be used to store sand and gravel; sand leakage holes are distributed on the bottom surface of the structural layer; two ends of the sand leakage holes are respectively connected to the sand storage cavity and the base layer.

[0007] The specific design of the pavement layer refers to the existing technology, and can use asphalt pavement, concrete pavement, etc. The structural layer refers to the structural layer of the existing technology, and can adopt various forms with sufficient bearing capacity, such as steel-concrete structure or steel structure, and needs to have a sand storage cavity that can store sand; the volume of the sand storage cavity depends on the actual geological conditions of the road and the required self-repair indicators, such as predicted settlement and maintenance frequency.

[0008] The sand storage cavities and sand storage holes can be evenly distributed relative to the road, or, depending on the actual geological conditions of the road, the distribution density and number can be increased in places where settlement is likely to occur, and the distribution density and number can be reduced in places where settlement is not likely to occur.

[0009] The pavement structure of this scheme includes a sand storage cavity for storing sand and gravel, and the sand storage cavity is connected to the base layer through a sand leakage hole. During the use of the pavement structure, the sand and gravel are stored inside the sand storage cavity. When the base layer of the road undergoes local settlement and causes a hollow cavity to appear below the corresponding position of the structural layer, since sand is permeable and can fill the gaps between the soil, the sand and gravel in the sand storage cavity will enter from the sand leakage hole at the corresponding position under the action of gravity and fill the hollow cavity, thereby being able to automatically repair the hollow cavity caused by local settlement of the base layer without the aid of other external equipment, thereby reducing the adverse effects of local settlement of the base layer on vehicle traffic, as well as reducing the frequency of overall excavation and maintenance of the road structure and reducing the maintenance cost of the road structure.

[0010] As a preferred solution of the present invention, when a vehicle passes along the road surface structure with a self-repairing function, the sand and gravel in the sand storage chamber can leak out from the sand leakage hole and be compacted.

[0011] The specific speed, weight, flow and duration of vehicle traffic will depend on the specific settlement conditions.

[0012] This scheme utilizes the impact load generated by vehicles on the road structure when passing. When the base layer of the road undergoes local settlement and causes a hollow cavity to appear below the corresponding position of the structural layer, the gravel will enter the hollow cavity from the sand leakage hole under the dual effects of the structural vibration caused by the vehicle impact load and gravity, and can be gradually compacted, thereby further improving the self-repair effect of this scheme on local settlement of the base layer, reducing the adverse impact of local settlement of the base layer on vehicle traffic, and reducing the frequency of overall excavation and maintenance of the road structure, thereby reducing the maintenance cost of the road structure; and in the case of long-term operation, due to the good drainage performance of gravel and the mutual locking characteristics between gravel particles, the continuous injection of gravel into the base layer of the road and filling can also make the settlement of the base layer gradually stabilize, thereby further reducing the maintenance frequency of the road structure.

[0013] As a preferred embodiment of the present invention, the sand storage chamber further comprises a sand injection hole; the sand injection hole is used to inject sand into the sand storage chamber.

[0014] The sand injection holes can be arranged at various places of the sand storage chamber, such as the side wall and / or the top of the sand storage chamber; if the sand injection holes are arranged on the top of the sand storage chamber, it is necessary to pay attention to the waterproof treatment of the sand injection holes to prevent rainwater from flowing into the sand storage chamber from the sand injection holes and affecting the fluidity of the sand and gravel in the sand storage chamber.

[0015] The sand injection holes should be evenly distributed relative to the sand storage cavity to ensure that when sand is injected into the sand storage cavity, the gravel can be spread evenly in the sand storage cavity as much as possible, to prevent the situation where there is too little gravel in some local areas of the sand storage cavity, so that when a hollow cavity appears, there is not enough gravel above the sand leakage hole at the corresponding position to fill the hollow cavity; but at the same time, it is also necessary to prevent the sand injection holes from affecting the passage of vehicles. Therefore, the sand injection holes should be set at a position that can avoid the vehicle trajectory line, such as the middle of the lane and / or the lane dividing line; the sand injection holes should have the function of preventing foreign matter or rainwater from entering the sand storage cavity, such as providing a detachable hole plug for the sand injection holes; when injecting sand, auxiliary equipment, such as rotary jet equipment, can be used to further ensure that the gravel is evenly spread in the sand storage cavity.

[0016] In this scheme, a sand injection hole is added to the sand storage cavity, so that sand can be injected into the sand storage cavity through the sand injection hole to replenish the sand storage cavity with the sand reduced due to entering the empty cavity, thereby preventing the situation where there is too little sand in a local area of ​​the sand storage cavity, so that when an empty cavity occurs, there is not enough sand above the sand leakage hole at the corresponding position to fill the empty cavity.

[0017] As a preferred solution of the present invention, the sand injection holes are arranged on the top surface of the structural layer.

[0018] This scheme recommends setting the sand injection holes on the top surface of the structural layer. When the lateral dimension of the road increases, the area of ​​the top surface of the structural layer will also increase accordingly. Therefore, this scheme can maintain the density of the sand injection holes relative to the sand storage cavity by increasing the number of sand injection holes along the lateral direction of the road, thereby preventing the sand injection holes from being too sparsely distributed relative to the sand storage cavity, and thus avoiding uneven distribution of gravel in the sand storage cavity after sand injection, and too little gravel in local areas of the sand storage cavity, so that when a hollow cavity occurs, there is not enough gravel above the sand leakage hole at the corresponding position to fill the hollow cavity.

[0019] As a preferred solution of the present invention, a hole plug is detachably connected to the sand injection hole located on the top surface of the structural layer.

[0020] The detachable connection between the hole plug and the sand injection hole can be in various forms, such as threaded connection or snap connection; the hole plug can be made of various materials, such as rubber or metal; the hole plug needs to avoid obstructing the passage of vehicles, and its top surface should be lower than the top surface of the pavement layer; if the top surface of the hole plug exceeds the top surface of the pavement layer, the height of the exceeding part should be controlled between two millimeters and three millimeters.

[0021] In view of the situation where the sand injection hole is set on the top surface of the structural layer, this scheme adds a detachable hole plug at the sand injection hole; when there is no need to inject sand into the sand storage cavity, the hole plug is installed at the sand injection hole to prevent rainwater or other debris from entering the sand storage cavity through the sand injection hole, affecting the fluidity of sand and gravel or even blocking the sand leakage hole.

[0022] As a preferred solution of the present invention, the structural layer is a steel box structure; the steel box structure includes a plurality of sub-steel boxes.

[0023] The inner cavity of the steel box structure is the sand storage cavity, and correspondingly, the sand leakage holes are arranged on the bottom surface of the steel box structure; if the pavement structure also includes sand injection holes, the sand injection holes can be arranged on the side walls and / or top surface of the steel box structure according to actual needs.

[0024] The number and distribution of the sub-steel boxes depend on the actual road conditions, such as setting one or more rows of sub-steel boxes continuously along the longitudinal direction of the road; the interior of each sub-steel box may be further provided with reinforcing ribs or partitions according to the actual load conditions; the connection method of two adjacent sub-steel boxes may refer to the existing technology, such as welding or bolting; the specific number and size of the sub-steel boxes depend on the actual road and load conditions.

[0025] This scheme adopts a steel box structure as the structural layer, which can make the pavement structure have good bearing capacity and rigidity. When the base layer undergoes local settlement and causes various potholes on the top surface of the base layer, this scheme can rely on its own rigidity to resist the small-scale deformation caused by the potholes on the top surface of the base layer, thereby reducing the adverse effects of the base layer settlement on vehicle traffic; at the same time, since this scheme has small deformation when facing local settlement, after gravel enters through the sand leakage holes and fills the vacant cavity, the performance and elevation of the pavement structure change little compared to before the local settlement occurs, that is, the repair effect is good, which works well with the self-repair function of this scheme.

[0026] Moreover, the steel box structure of the present solution is composed of a plurality of sub-steel boxes of different sizes, thereby reducing the difficulty of manufacturing, transporting and hoisting the steel box structure, and facilitating obtaining higher construction quality and faster construction speed; at the same time, when the road structure is partially damaged, the steel box structure of the present solution is a modular structure, and therefore can be repaired by replacing the sub-steel boxes of the damaged part without replacing the entire steel box structure, and thus has better maintainability and lower maintenance cost; and when large-scale settlement of the road base causes the pavement structure to fluctuate longitudinally, the present solution makes it easier to repair the pavement structure by adjusting the elevation and inclination of the sub-steel boxes at different positions, and during the repair process, there is no need to remove and reconstruct all the pavement layers within the settlement range, but only the pavement layers at the junctions of the sub-steel boxes need to be removed and reconstructed, thereby reducing maintenance costs.

[0027] At the same time, this solution also has good permeability. Compared with the existing physical road structure that absorbs and stores heat, this solution is not easy to store heat, and it is more difficult to conduct heat between the pavement layer and the base layer. If a hole is opened on the web side of the steel box structure and the road structure is kept laterally permeable, the air inside and outside the steel box structure can also convect, and the heat can be actively removed from the roadbed in time, thereby avoiding the base layer from absorbing and accumulating too much heat transferred from the pavement layer and causing diseases such as freeze-thaw. It is more suitable for frozen soil areas where freeze-thaw diseases need to be avoided.

[0028] Moreover, steel is an environmentally friendly material that is recyclable and reusable, and can meet the needs of low-carbon and environmentally friendly construction.

[0029] As a preferred solution of the present invention, the sub-steel boxes are continuously distributed along the longitudinal direction and the transverse direction of the road.

[0030] The specific number and size of the sub-steel boxes depend on the actual needs of the road.

[0031] This solution is that the steel box structure is composed of multiple smaller sub-steel boxes along the horizontal and longitudinal directions of the road, thereby reducing the difficulty of manufacturing, transporting and hoisting the steel box structure as much as possible, which is conducive to obtaining higher construction quality and faster construction speed.

[0032] As a preferred solution of the present invention, the two adjacent sub-steel boxes along the longitudinal direction of the road can swing relative to each other; the axis of the swing is along the transverse direction of the road.

[0033] The relative swing of two adjacent sub-steel boxes along the longitudinal direction of the road can be achieved by various mechanisms, such as hinges or hinges.

[0034] This solution allows two adjacent sub-steel boxes along the longitudinal direction of the road to swing relative to each other. When the road base undergoes large-scale settlement and fluctuates along its longitudinal direction, the road structure of this solution can readapt to the shape of the road base by changing the relative angles of the sub-steel boxes along the longitudinal direction of the road, thereby avoiding deformation and damage to the sub-steel box body; at the same time, when the corresponding sub-steel box needs to be lifted due to road repair, this solution can also readapt to the new elevation by changing the relative angles of the corresponding sub-steel box and its nearby sub-steel boxes. Compared with other solutions, such as the solution using an integral steel box structure, this solution generates less resistance from the steel box structure during the lifting operation, which can reduce the requirements for lifting equipment and the difficulty of the lifting operation.

[0035] As a preferred embodiment of the present invention, it also includes a connecting buckle; the connecting buckle is arranged at the intersection of four adjacent sub-steel boxes along the longitudinal direction and the transverse direction of the road respectively; the connecting buckle includes a transverse connector and a longitudinal connector; the transverse connector and the longitudinal connector are hingedly connected; the axis of the hinged connection is along the transverse direction of the road; the transverse connector is used to connect two adjacent sub-steel boxes along the transverse direction of the road; the longitudinal connector is used to connect two adjacent sub-steel boxes along the longitudinal direction of the road.

[0036] The design of the transverse connector and the longitudinal connector can refer to the design of the existing limit connection structure and be made in the form of a tenon or a mortise and tenon. Correspondingly, the sub-steel box is provided with a corresponding mortise and tenon.

[0037] This solution provides connecting buckles for the sub-steel boxes, which are arranged at the intersections of the joints of four adjacent sub-steel boxes along the longitudinal and transverse directions of the road, and respectively connect two sub-steel boxes adjacent to each other along the transverse direction of the road through transverse connectors, and connect two sub-steel boxes adjacent to each other along the longitudinal direction of the road through longitudinal connectors, thereby reducing the number of connectors required for adjacent sub-steel boxes, reducing the workload and difficulty of assembling or disassembling the sub-steel boxes, and reducing construction and operation and maintenance costs; and the hinged connection between the transverse connector and the longitudinal connector can also realize the relative swing of two sub-steel boxes adjacent to each other along the longitudinal direction of the road.

[0038] As a preferred embodiment of the present invention, a snap-in entrance is provided on the top surface of the sub-steel box; a longitudinal groove is provided inside the sub-steel box; the longitudinal groove opens toward one end of the snap-in entrance; an installation structure for connecting the transverse connecting piece is provided at one end of the longitudinal groove away from the snap-in entrance; the transverse connecting piece can enter the longitudinal groove in the sub-steel box through the snap-in entrance and be connected to the installation structure.

[0039] This solution makes it impossible for the transverse connector to detach from its corresponding mounting structure by linear motion, especially only by vertical motion, but requires a motion trajectory similar to an "L" shape to detach from its corresponding mounting structure; specifically, this can be achieved by providing an "L"-shaped slot in the steel box structure, with the top of the "L"-shaped slot being a snap-on entrance for the transverse connector to enter, and the other end of the "L"-shaped slot being a mounting structure.

[0040] If the positions of the transverse connector and the longitudinal connector along the longitudinal direction of the road are designed to overlap with each other, the shapes of the connecting buckle and the corresponding mounting structure on the sub-steel box can be made relatively simple. When installing the connecting buckle, the connecting buckle can be directly placed into the corresponding mounting structure of the sub-steel box along the vertical direction, which is easy to install; however, such a design will also cause the directions in which the transverse connector and the longitudinal connector exit the sub-steel box to be vertical and overlap with each other, which will cause the connecting buckle to be easily loosened when subjected to a vertical upward load;

[0041] In this solution, the installation structure for connecting with the transverse connector is arranged inside the sub-steel box, and the installation structure is located on one side of the buckle entrance for the transverse connector to enter the sub-steel box, so that the transverse connector cannot be separated from its corresponding installation structure through simple linear movement, especially only moving in the vertical direction, thereby increasing the difficulty of separating the transverse connector from the installation structure, and thus making the connection between the connecting buckle and the sub-steel box more reliable; at the same time, since the transverse connector and the longitudinal connector of the present solution are hingedly connected to each other, when installing the connecting buckle, the transverse connector can be rotated to a corresponding angle relative to the longitudinal connector to connect with the installation structure. Therefore, the present solution will not complicate the connection operation of the sub-steel box, and can still achieve quick connection.

[0042] As a preferred embodiment of the present invention, the connecting buckle further comprises a connecting section; the transverse connecting member and the longitudinal connecting member are respectively hingedly connected to two ends of the connecting section; and the axis of the hinged connection is transversely along the road.

[0043] This solution adds an additional connecting section to the connecting buckle, and the two ends of the connecting section are respectively hinged to the transverse connecting member and the longitudinal connecting member, which can increase the swing angle of the transverse connecting member relative to the longitudinal connecting member, thereby making it easier to rotate the relative angle of the transverse connecting member and the longitudinal connecting member to match the relative angle of the corresponding installation structure in the sub-steel box, thereby making the operation of installing the connecting buckle smoother and improving the assembly efficiency of the sub-steel box.

[0044] As a preferred embodiment of the present invention, the transverse connecting member includes a limit column arranged along the transverse direction of the road; corresponding first limit grooves are arranged on the corresponding side walls of the two adjacent sub-steel boxes along the transverse direction of the road; the two ends of the limit column are respectively installed in the corresponding first limit grooves; baffles are also arranged at both ends of the limit column; the baffles are used to prevent the two adjacent sub-steel boxes along the transverse direction of the road from moving away from each other.

[0045] This scheme is one of the specific design schemes of the longitudinal connecting parts, which can conveniently connect the corresponding two sub-steel boxes using the side walls of two adjacent sub-steel boxes along the longitudinal direction of the road. Compared with the existing technology, such as the bolt connection method, the operation of tightening the bolts can be eliminated; and compared with the welding connection method, this scheme has low requirements for construction space and can eliminate on-site welding operations, thereby increasing the assembly speed and reducing the difficulty of construction.

[0046] As a preferred solution of the present invention, the longitudinal connecting member is provided with limiting plates at both ends along the longitudinal direction of the road; second limiting grooves of corresponding shapes are provided at corresponding positions of the two adjacent sub-steel box top plates along the longitudinal direction of the road; and the limiting plates are installed in the corresponding second limiting grooves.

[0047] The limiting plates can be in various shapes, such as rectangular plates, trapezoidal plates; and the limiting plates at both ends of the longitudinal connector can be designed so that the overall shape of the longitudinal connector includes a shape that is larger at both ends and smaller in the middle along the longitudinal direction of the road, such as an "H" shape or a fishbone shape, so that the shape of the longitudinal connector can directly prevent two adjacent sub-steel boxes along the longitudinal direction of the road from moving away from each other.

[0048] This scheme is one of the specific designs of the longitudinal connector, which can conveniently connect the corresponding two sub-steel boxes using the top plates of two adjacent sub-steel boxes along the longitudinal direction of the road. Compared with the existing technology, such as the bolt connection method, the operation of tightening the bolts can be eliminated, thereby increasing the assembly speed.

[0049] As a preferred solution of the present invention, a convex structure is distributed on a side of the structural layer facing the base layer; and the convex structure can be inserted into the base layer.

[0050] This scheme recommends setting a raised structure on the bottom surface of the structural layer that can be inserted into the base layer, which can increase the friction between the structural layer and the base layer, thereby reducing the possibility of the structural layer slipping relative to the base layer; the specific shape, number and size of the raised structure are set according to actual conditions.

[0051] As a preferred solution of the present invention, the protruding structure is an annular component; the number and position of the protruding structure match the number and position of the sand leakage holes.

[0052] This scheme recommends setting an annular component as a raised structure at one end of the sand leakage hole close to the base layer. On the one hand, the annular component can serve as a stiffening ring on the bottom surface of the structural layer at the sand leakage hole, and on the other hand, it can also guide the sand and gravel exposed from the sand leakage hole.

[0053] As a preferred solution of the present invention, the distance between two adjacent sand leakage holes is Dd; 30cm≤Dd≤50cm.

[0054] This scheme recommends the distance between two adjacent sand leakage holes, which can prevent the density of the sand leakage holes from being too low, resulting in the road area corresponding to a single sand leakage hole being too large. When a hollow cavity appears at the bottom of the corresponding sand leakage hole, the sand leakage cannot fill the hollow cavity.

[0055] As a preferred solution of the present invention, the diameter of the sand leakage hole is Ds; 5cm≤Ds≤10cm.

[0056] This scheme recommends the diameter of the sand leakage hole, which can prevent the sand leakage hole from being too small in diameter and affecting the passage of sand and gravel, or the sand leakage hole from being too large in diameter and weakening the strength of the sand storage chamber bottom plate too much.

[0057] As a preferred solution of the present invention, the upper part of the side wall of the structural layer is further provided with a ventilation hole; the ventilation hole is communicated with the sand storage chamber.

[0058] The height of the ventilation holes on the side wall of the structural layer is determined according to the actual situation, such as the storage height of gravel in the sand storage cavity. The bottom height should not be lower than the storage height of gravel in the sand storage cavity to avoid sand leakage. The total area of ​​the ventilation holes is determined according to the actual situation of the construction site, such as climatic conditions. The ventilation holes can be of various shapes, such as circular, rectangular, and trapezoidal.

[0059] This solution sets ventilation holes on the side walls of the structural layer to enable gas exchange between the inside and outside of the structural layer, thereby forming cold and hot air convection, thereby promoting heat dissipation in the base layer and avoiding heat accumulation in the base layer. It is suitable for frozen soil areas that need to avoid freeze-thaw diseases.

[0060] As a preferred solution of the present invention, the structural layer is further provided with a lifting structure; the lifting structure is used to lift the corresponding segment of the structural layer.

[0061] The lifting structure can be in various forms according to the lifting equipment available, such as lifting rings, hooks, and lifting holes; but it should not be blocked by the pavement layer. If a lifting structure in the form of a lifting hole is used, the pavement layer may not be set at the corresponding position, or a removable pavement layer may be used at the corresponding position to avoid the lifting structure being covered and blocked by the pavement layer; the layout of the lifting structure is determined according to the specific form of the lifting structure and the specifications of the pavement structure, and it should be ensured that the structural layer at the corresponding position of the lifting structure can be lifted stably without affecting the traffic on the road.

[0062] When large-scale settlement occurs in the pavement structure and causes the pavement structure to sink and deform, the self-repair function of the gravel in the sand storage cavity alone cannot restore the pavement structure to its shape and elevation before deformation. Therefore, this solution further adds a lifting structure to the pavement structure; when large-scale settlement occurs in the pavement structure and causes the pavement structure to sink and deform, other lifting equipment, such as a crane or a dedicated special vehicle, can be conveniently used to lift the sunken part of the pavement structure to a specified height, such as the original design elevation, through the lifting structure, and then the gravel is allowed to fill the vacant cavity under the pavement structure through the sand leakage holes, thereby achieving the repair of the vacant cavity and pavement structure deformation caused by large-scale settlement, which can further reduce the frequency of overall excavation and maintenance of the pavement structure of this solution and reduce the maintenance cost of the road structure.

[0063] As a preferred solution of the present invention, the lifting structure is a sand injection hole.

[0064] The lifting structure of the present invention also serves as a sand injection hole, that is, a through hole connected to the sand storage chamber is selected, so that the lifting structure can also be used to inject sand into the sand storage chamber, so as to replenish the sand storage chamber with the sand reduced due to entering the empty cavity, and prevent the situation where there is too little sand in a local area of ​​the sand storage chamber, so that when an empty cavity occurs, there is not enough sand above the sand leakage hole at the corresponding position to fill the empty cavity.

[0065] Moreover, the lifting structure of the present scheme has both lifting and sand injection functions, thus avoiding the need to set up separate structures for the lifting and sand injection functions respectively. On the one hand, it can reduce the complexity of the pavement structure of the present scheme, thereby reducing manufacturing and construction costs; on the other hand, it can avoid opening too many holes on the structural layer, thereby avoiding the influence of too many holes on the strength of the structural layer.

[0066] As a preferred solution of the present invention, the lifting structure is at least arranged on the top surface of the structural layer.

[0067] In view of the situation where the lifting structure is a through hole connected to the sand storage chamber, this solution further arranges the lifting structure on the top surface of the structural layer, which can facilitate the operation of lifting the pavement structure using the lifting equipment.

[0068] A road surface repair method, applied to a road surface structure with self-repairing function of the present invention, comprises the following steps:

[0069] A. Lift the corresponding part of the structural layer to the specified elevation;

[0070] B. Vibrate the structural layer until the gravel fills the emptied cavity and reaches the predetermined compaction degree.

[0071] In step A, various lifting equipment can be used to lift the corresponding part of the structural layer, such as a crane or a special vehicle, so as to lift the structural layer to the specified elevation; a lifting structure corresponding to the lifting equipment should be set on the structural layer; the specified elevation can be various situations according to design requirements, such as the original elevation or a new elevation after considering the change of the base state;

[0072] In step B, the vibration frequency is determined according to the specific structure and natural frequency of the pavement structure, as long as it can promote the gravel to enter the hollow cavity through the sand leakage holes and be compacted; considering that this scheme is mainly used to deal with large-scale settlement, the gravel content in the sand storage cavity needs to be poured in this step. If the gravel content is insufficient, sand needs to be injected into the sand storage cavity in this step or before this step.

[0073] When large-scale settlement occurs in the pavement structure and causes the pavement structure to sink and deform, the self-repair function of the gravel in the sand storage cavity can only restore the bearing capacity of the roadbed to a certain extent, but cannot restore the pavement structure to its shape and elevation before deformation. Therefore, the pavement repair method of this scheme first uses external lifting equipment to lift the pavement to a specified elevation, and then uses vibration to promote the gravel to enter the empty cavity through the sand leakage holes and compact it; thereby repairing the depression and deformation of the pavement structure caused by large-scale settlement; at the same time, this scheme also accelerates the flow and compaction process of gravel through vibration, thereby speeding up the repair speed and reducing the economic losses to the normal operation of vehicles caused by the closure of lanes during the repair process.

[0074] A pavement construction method, applied to a pavement structure with self-repairing function of the present invention, comprises the following steps:

[0075] 1. Prefabricate the structural layer in the factory and transport the structural layer to the construction site;

[0076] 2. Install the structural layer to the designated position; inject sand into the sand storage chamber.

[0077] In step one, the pavement layer can be prefabricated together with the structural layer, or it can be constructed on site; the specific size of the prefabricated structural layer depends on the actual manufacturing, transportation and lifting capabilities.

[0078] In step 2, sand injection can be carried out by means of rotary jetting, or vibration can be used during sand injection to evenly spread the sand in the sand storage chamber; sand injection can be carried out on the constructed structural layers after each structural layer is constructed, or sand injection can be carried out uniformly after all structural layers are constructed.

[0079] The construction method of this scheme chooses to prefabricate the structural layer in the factory, and then injects sand into the sand storage cavity after the structural layer is installed in place, which can reduce the weight of the structural layer during transportation, thereby reducing the difficulty of transporting the structural layer.

[0080] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0081] 1. The pavement structure of this scheme includes a sand storage cavity capable of storing sand and gravel, and the sand storage cavity is connected to the base layer through a sand leakage hole. During the use of the pavement structure, the sand and gravel are stored inside the sand storage cavity;

[0082] When local settlement occurs in the base layer of the road and causes a hollow cavity below the corresponding position of the structural layer, the sand in the sand storage cavity will enter from the sand leakage holes at the corresponding position under the action of gravity and fill the hollow cavity, because the sand is permeable and can fill the gaps between the soil. This can automatically repair the hollow cavity caused by local settlement of the base layer without the help of other external equipment, thereby reducing the adverse effects of local settlement of the base layer on vehicle traffic, reducing the frequency of excavation and maintenance of the overall road structure, and reducing the maintenance cost of the road structure;

[0083] Furthermore, the present solution can also utilize the impact load generated by vehicles on the road structure during passage, so that the sand and gravel enter the empty cavity from the sand leakage holes under the dual effects of gravity and the vehicle impact load, and can be gradually compacted, thereby further enhancing the self-repair effect of the present solution on local settlement of the base layer; and in the case of long-term operation, due to the good drainage performance of gravel and the mutual locking characteristics between gravel particles, the continuous injection of gravel into the base layer of the road and filling can also make the settlement of the base layer gradually stabilize, thereby further reducing the maintenance frequency of the road structure.

[0084] 2. The present invention can further add sand injection holes to the sand storage cavity, so that sand can be injected into the sand storage cavity through the sand injection holes to replenish the sand storage cavity with the sand reduced due to entering the empty cavity, thereby preventing the sand from being too small in a local area of ​​the sand storage cavity, so that when an empty cavity occurs, there is not enough sand above the sand leakage hole at the corresponding position to fill the empty cavity.

[0085] 3. The present invention can adopt a steel box structure as the structural layer, so that the pavement structure has good bearing capacity and rigidity. When the base layer undergoes local settlement and causes various potholes on the top surface of the base layer, the present solution can rely on its own rigidity to resist the small-scale deformation caused by the potholes on the top surface of the base layer, thereby reducing the adverse effects of the base layer settlement on vehicle traffic. At the same time, since the present solution has a small deformation when facing local settlement, after the gravel enters through the sand leakage hole and fills the emptied cavity, the performance and elevation of the pavement structure change little compared to before the local settlement occurs, that is, the repair effect is good, which works well with the self-repair function of the present solution.

[0086] At the same time, the steel box structure also has good permeability. Compared with the existing physical road structure that absorbs and stores heat, this solution is not easy to store heat, and it is more difficult to conduct heat between the pavement layer and the base layer. If a hole is opened on the web side of the steel box structure and the road structure is kept laterally permeable, the air inside and outside the steel box structure can also convect, and the heat can be actively removed from the roadbed in time, thereby avoiding the base layer from absorbing and accumulating too much heat transferred from the pavement layer and causing diseases such as freeze-thaw. It is more suitable for frozen soil areas where freeze-thaw diseases need to be avoided.

[0087] Moreover, steel is an environmentally friendly material that is recyclable and reusable, and can meet the needs of low-carbon and environmentally friendly construction.

[0088] 4. The pavement repair method of the present invention first uses external lifting equipment to lift the pavement to a specified elevation, and then uses vibration to promote the gravel to enter the empty cavity through the sand leakage holes and compact it; thereby repairing the concave deformation of the pavement structure caused by large-scale settlement; at the same time, this solution also accelerates the flow and compaction process of gravel through vibration, thereby speeding up the repair speed and reducing the economic losses caused by the closure of the lane during the repair process to the normal operation of vehicles.

[0089] 5. The construction method of the present invention selects to prefabricate the structural layer in the factory, and then injects sand into the sand storage cavity after the structural layer is installed in place, which can reduce the weight of the structural layer during transportation, thereby reducing the difficulty of transporting the structural layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0090] Figure 1 It is a schematic diagram of the longitudinal section structure of a pavement structure with a self-repairing function installed on a base layer of the present invention;

[0091] Figure 2This is a self-repairing working principle diagram of a pavement structure with self-repairing function of the present invention;

[0092] Figure 3 It is a schematic diagram of the longitudinal section structure of a pavement structure with self-repairing function according to the present invention;

[0093] Figure 4 It is a top view schematic diagram of a pavement structure with self-repairing function of the present invention;

[0094] Figure 5 It is a top view schematic diagram of a pavement structure with self-repairing function of the present invention in a state where a pavement layer is removed;

[0095] Figure 6 It is a partial enlarged view of a longitudinal section structural schematic diagram of a pavement structure with a self-repairing function according to the present invention;

[0096] Figure 7 It is a partial schematic diagram of a steel box structure bottom plate of a pavement structure with self-repairing function according to the present invention;

[0097] Figure 8 It is a repair working principle diagram of a road surface repair method of the present invention;

[0098] Fig. 9 It is a schematic diagram of the three-dimensional structure of the connecting buckle;

[0099] Fig.10 It is a schematic diagram of the local three-dimensional structure of the connection buckle;

[0100] Fig.11 This is a schematic diagram of the installation of the connecting buckle;

[0101] Fig.12 It is a schematic diagram of the local three-dimensional structure at the raised structure;

[0102] Icons: 1-pavement layer; 11-lane marking; 2-structural layer; 21-sand storage cavity; 22-sand leakage hole; 23-sand injection hole; 24-hole plug; 25-sub-steel box; 251-longitudinal rib; 252-first limit groove; 253-second limit groove; 26-raised structure; 27-crossbeam; 3-base layer; 31-empty cavity; 4-connecting buckle; 41-transverse connecting piece; 42-longitudinal connecting piece; 43-connecting section; 411-limiting column; 412-baffle; 421-limiting plate; 5-special maintenance vehicle; 51-sand injection equipment; 52-jib; 53-vibration equipment; 54-wheel. DETAILED DESCRIPTION

[0103] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0104] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0105] Example 1

[0106] like Figures 1 to 8 As shown, a pavement structure with self-repairing function adopted by the present invention comprises a pavement layer 1 and a structural layer 2; the structural layer 2 comprises a sand storage cavity 21; the sand storage cavity 21 can be used to store sand and gravel; sand leakage holes 22 are distributed on the bottom surface of the structural layer 2; the two ends of the sand leakage holes 22 are respectively connected to the sand storage cavity 21 and the base layer 3.

[0107] The pavement layer 1 refers to the prior art, and may be an asphalt pavement layer 1 or a combination of an asphalt pavement layer 1 and a concrete layer.

[0108] The structural layer 2 can be made of various materials with sufficient strength, such as steel or high-elasticity resin materials.

[0109] The gravel in the sand storage chamber 21 should preferably be of a larger particle size to avoid the gravel from becoming damp and hardened; at the same time, the gravel should also have a smaller surface roughness and a rounded shape to facilitate the gravel to be evenly spread in the sand storage chamber 21.

[0110] The distance between two adjacent sand leakage holes 22 is Dd, and the diameter of the sand leakage hole 22 is Ds; 30cm≤Dd≤50cm, 5cm≤Ds≤10cm; For this embodiment, the sand leakage holes 22 are evenly distributed on the bottom surface of the structural layer 2, specifically in a rectangular array, and the distance between two adjacent sand leakage holes 22 along the longitudinal and transverse directions of the road is Dd; 30cm≤Dd≤50cm; Fig.12 As shown, there are several protruding structures 26 distributed on the bottom surface of the structural layer 2; specifically, the protruding structures 26 are annular components whose size, number and position correspond to the sand leakage holes 22; the end surface of the protruding structure 26 protrudes one to two centimeters relative to the bottom surface of the structural layer 2.

[0111] The structural layer 2 is also provided with a sand injection hole 23; for this embodiment, the sand injection hole 23 is specifically a through hole provided on the top surface of the structural layer 2 and connected to the sand storage cavity 21, so that sand can be injected into the sand storage cavity 21 through the sand injection hole 23, and the sand injection hole 23 can also be used as a lifting structure for connecting with a lifting device to lift the structural layer 2 to a corresponding stage. In order to prevent the paving layer 1 from covering the sand injection hole 23, such as Figure 4 and Figure 5As shown, in this embodiment, three lane markings 11 are arranged transversely along the road, and the sand injection holes 23 are arranged at the positions where the lane markings 11 are located, so as to avoid interference with the passage of vehicles; a hole plug 24 is detachably connected to the sand injection hole 23 to prevent rainwater or other debris from entering the sand storage chamber 21 from the sand injection hole 23; the upper surface of the hole plug 24 is lower than the upper surface of the pavement layer 1, so as to avoid affecting the passage of vehicles.

[0112] A ventilation hole is also provided at the upper part of the side wall of the structural layer 2; the ventilation hole is connected to the sand storage chamber 21; correspondingly, when filling the sand storage chamber 21 with sand, it is necessary to keep the height of the gravel in the sand storage chamber 21 lower than the height of the lowest point of the ventilation hole.

[0113] For this embodiment, Figure 2 As shown, when the base layer 3 of the road undergoes local settlement and causes a hollow cavity 31 to appear below the corresponding position of the structural layer 2, the gravel in the sand storage cavity 21 will enter from the sand leakage hole 22 at the corresponding position under the action of gravity and fill the hollow cavity 31, and will be gradually compacted under the continuous action of the structural vibration caused by the impact load P of the vehicle's wheels 54 on the pavement structure, thereby being able to automatically repair the hollow cavity 31 caused by the local settlement of the base layer 3, thereby reducing the frequency of excavation and maintenance of the entire road structure and reducing the maintenance cost of the road structure; when the gravel inside the sand storage cavity 21 is reduced, sand injection equipment or a special maintenance vehicle 5 can be used to replenish gravel into the sand storage cavity 21 through the sand injection hole 23.

[0114] Example 2

[0115] like Figures 1 to 8 As shown, based on Example 1, the structural layer 2 is a steel box structure; the steel box structure is composed of a plurality of sub-steel boxes 25; the sub-steel boxes 25 are continuously distributed along the longitudinal direction and the transverse direction of the road; two adjacent sub-steel boxes 25 along the longitudinal direction of the road can swing relative to each other; and the axis of the swing is along the transverse direction of the road.

[0116] like Figure 5 As shown, the pavement structure of this embodiment includes two rows of sub-steel boxes 25 along the transverse direction of the road, and the sub-steel boxes 25 along the longitudinal direction of the road are determined according to the length of the road; specifically, each sub-steel box 25 includes a top plate, a bottom plate and a side plate, thereby forming a box body with corresponding plates on six sides; the length, width and height of each sub-steel box 25 are Ls, Ws and Hs respectively, 5m≤Ls≤8m, 3.5m≤Ws≤4.5m, 20cm≤Hs≤50cm.

[0117] In the steel box structure, a cross beam 27 is provided between every two sub-steel boxes 25, thereby increasing the rigidity of the entire steel box structure along the transverse direction of the road and the torsional rigidity of the cross section of the steel box structure.

[0118] For the mutual connection between each sub-steel box 25, this embodiment also includes a connecting buckle 4; the connecting buckle 4 is arranged at the intersection of four sub-steel boxes 25 adjacent to each other along the longitudinal direction and the transverse direction of the road respectively; the connecting buckle 4 includes a transverse connector 41 and a longitudinal connector 42; the transverse connector 41 and the longitudinal connector 42 are hingedly connected; the axis of the hinged connection is along the transverse direction of the road; the transverse connector 41 is used to connect two adjacent sub-steel boxes 25 along the transverse direction of the road; the longitudinal connector 42 is used to connect two adjacent sub-steel boxes 25 along the longitudinal direction of the road.

[0119] Specifically, for the transverse connecting member 41, as Fig. 9 and Fig.10 As shown, the transverse connecting member 41 includes a limiting column 411 arranged in the transverse direction of the road; corresponding first limiting grooves 252 are arranged on the corresponding side walls of two adjacent sub-steel boxes 25 in the transverse direction of the road; both ends of the limiting column 411 are respectively installed in the corresponding first limiting grooves 252, so as to prevent the adjacent sub-steel boxes 25 from shifting and deforming up and down; both ends of the limiting column 411 are also provided with baffles 412; the baffles 412 are used to prevent the two adjacent sub-steel boxes 25 in the transverse direction of the road from moving away from each other; specifically, as shown in FIG. Fig.10 As shown, the two sub-steel boxes 25 on the left and right sides of the figure are provided with additional longitudinal ribs 251 inside near the limiting column 411, and the first limiting groove 252 is provided on the longitudinal ribs 251, so that when the transverse connecting member 41 enters the first limiting groove 252, the two baffles 412 of the transverse connecting member 41 can respectively abut against the longitudinal ribs 251 on the left and right sides to prevent the sub-steel boxes 25 on the left and right sides from separating from each other.

[0120] For the longitudinal connecting member 42, as Figure 5 and Fig.10 As shown, both ends of the longitudinal connector 42 along the longitudinal direction of the road are provided with limit plates 421; the corresponding positions of the top plates of the two adjacent sub-steel boxes 25 along the longitudinal direction of the road are provided with second limit grooves 253 of corresponding shapes; the limit plates 421 are installed in the corresponding second limit grooves 253. For this embodiment, the limit plates 421 at both ends of the longitudinal connector 42 along the longitudinal direction of the road are rectangular plates, and the sizes of the two limit plates 421 are larger than the size of the connection between them, so that the longitudinal connector 42 is "H"-shaped as a whole; correspondingly, the top plate of each sub-steel box 25 is respectively provided with an "L"-shaped second limit groove 253. When the four sub-steel boxes 25 are assembled with each other, the four "L"-shaped second limit grooves 253 are combined into an "H"-shaped groove corresponding to the longitudinal connector 42, so that after being combined with the longitudinal connector 42, the appearance of the longitudinal connector 42 can prevent the sub-steel boxes 25 from separating from each other along the longitudinal direction of the road.

[0121] like Fig. 9As shown, the connecting buckle 4 further includes a connecting section 43; a transverse connecting member 41 and a longitudinal connecting member 42 are respectively hingedly connected to the two ends of the connecting section 43; and the axis of the hinged connection is along the transverse direction of the road.

[0122] Furthermore, a buckle entrance is provided on the top surface of the sub-steel box 25; a longitudinal groove is provided inside the sub-steel box 25; the longitudinal groove opens toward one end of the buckle entrance; an installation structure for connecting the transverse connector 41 is provided at one end of the longitudinal groove away from the buckle entrance; the transverse connector 41 can enter the longitudinal groove in the sub-steel box 25 through the buckle entrance and connect with the installation structure. For this embodiment, the second limiting groove 253 can be directly used as the buckle entrance, and the first limiting groove 252 can be used as the longitudinal groove and the installation structure, that is, the size of the second limiting groove 253 is set to allow the transverse connector 41 to enter and exit, and the first limiting groove 252 is set to be along the longitudinal direction of the road and located on one side of the second limiting groove 253 along the longitudinal direction of the road, and open at one end close to the second limiting groove 253, and the end away from the second limiting groove 253 is used to cooperate with the baffle 412.

[0123] The present embodiment adopts a steel box structure as the structural layer 2, which can make the pavement structure have good bearing capacity and rigidity. When the base layer 3 undergoes local settlement and causes various potholes on the top surface of the base layer 3, the present embodiment can rely on its own rigidity to resist the small-scale deformation caused by the potholes on the top surface of the base layer 3, thereby reducing the adverse effects of the settlement of the base layer 3 on the passage of vehicles; at the same time, since the present embodiment has a small deformation when facing local settlement, after the gravel enters through the sand leakage hole 22 and fills the hollow cavity 31, the performance and elevation of the pavement structure change less than before the local settlement occurs, that is, the repair effect is good, which works well with the self-repair function of the present embodiment.

[0124] Moreover, the steel box structure of the present embodiment is composed of a plurality of sub-steel boxes 25 of different sizes, thereby reducing the difficulty of manufacturing, transporting and hoisting the steel box structure, and facilitating obtaining higher construction quality and faster construction speed. At the same time, when the road structure is partially damaged, the steel box structure of the present embodiment is a modular structure, so it can be repaired by replacing the damaged sub-steel box 25 without replacing the entire steel box structure, and has better maintainability and lower maintenance cost. When the road base undergoes large-scale settlement, causing the pavement structure to fluctuate longitudinally, the present embodiment makes it easier to repair the pavement structure by adjusting the elevation and inclination of the sub-steel boxes 25 at different positions, and for low-grade roads, it is not necessary to remove and reconstruct all the pavement layers 1 within the settlement range during the repair process, but only the pavement layers 1 at the junctions of the sub-steel boxes 25 need to be removed and reconstructed, thereby reducing maintenance costs. For high-grade roads, the same repair method can be used, but for aesthetic considerations, the pavement layers 1 on all the sub-steel boxes 25 within the settlement repair range can also be replaced.

[0125] Example 3

[0126] like Figure 8 As shown, a pavement repair method adopted by the present invention is applied to any pavement structure with self-repairing function in Examples 1 to 2, comprising the following steps:

[0127] A. Lift the corresponding part of structural layer 2 to the specified elevation;

[0128] B. Vibrate the structural layer 2 until the gravel fills the hollow cavity 31 and reaches a predetermined compaction degree.

[0129] In step A, various lifting equipment can be used to connect with the part of the structural layer 2 that needs to be lifted, such as a crane or a special vehicle, so as to lift the structural layer 2 to the specified elevation; for example, in this embodiment, the sand injection hole 23 can be used as a lifting structure to connect with the lifting equipment, so a special maintenance vehicle 5 with a boom 52 whose size matches the sand injection hole 23 can be used, and its boom 52 is inserted into the sand injection hole 23, so as to lift the segment of the corresponding part of the structural layer 2; according to the arrangement position of the sand injection hole 23, there may be a situation where additional equipment is needed to assist the stability of the structural layer 2 to prevent overturning accidents, such as if the sand injection hole 23 is set in the middle of the structural layer 2; the specified elevation can be various situations according to design requirements, such as the original elevation or a new elevation after considering the change in the state of the base layer 3; this embodiment adopts the situation of lifting the structural layer 2 to the original elevation.

[0130] In addition to using the sand injection hole 23 directly as a lifting structure, a lifting structure specifically connected to the lifting equipment can also be set on the top surface and / or side wall of the structural layer 2; for example, an oblong hole is set on the top surface of the structural layer 2 as a lifting structure, and a "7"-shaped hook is set on the boom 52, and the length of the hook in the horizontal direction is less than the length of the oblong hole but wider than the width of the oblong hole; when the structural layer 2 needs to be lifted, the length direction of the hook is made parallel to the length direction of the oblong hole so that the hook can be extended into the oblong hole, and then the hook can be rotated to make the hook stuck inside the oblong hole, so that the corresponding position of the structural layer can be lifted by the hook.

[0131] In step B, the vibration frequency is determined according to the specific structure and natural frequency of the pavement structure, as long as it can promote the gravel to enter the hollow cavity 31 through the sand leakage hole 22 and be compacted; considering that the present embodiment is mainly used to deal with large-scale settlement, the gravel content in the sand storage cavity 21 needs to be poured in this step. If the gravel content is insufficient, it is necessary to inject sand into the sand storage cavity 21 in this step or before this step; since the sand injection hole 23 of the present embodiment is connected to the boom 52 as a lifting structure, the boom 52 can be made into a hollow structure, and a sand injection device 51 connected thereto can be added, so that while the structural layer 2 is lifted by the boom 52, the sand storage cavity 21 can be injected synchronously by the boom 52, so as to always keep sufficient gravel content in the sand storage cavity 21; at the same time, the vibration device 53 can also be integrated on the special maintenance vehicle 5, so that it can move with the special maintenance vehicle 5 to simplify the operation process of road maintenance.

[0132] When the gravel fills up the emptied cavity 31, the boom 52 is released and the special maintenance vehicle 5 is moved to the next section of the structural layer 2 that needs to be repaired for the next maintenance; the operation is repeated until all the scheduled maintenance sections are completed.

[0133] When the settlement height is less than or equal to fifteen centimeters, the pavement structure of this embodiment can achieve self-repair function under the dual effects of structural vibration and gravity generated by the impact load of vehicle traffic, and the pavement repair method of this embodiment can be used when the settlement height is greater than fifteen centimeters. First, the pavement is lifted to the specified elevation using a lifting device, and then vibration is used to promote the gravel to pass through the sand leakage holes 22 into the hollow cavity 31 and compact it; thereby, the concave deformation of the pavement structure caused by large-scale settlement can be repaired; at the same time, this solution also accelerates the flow and compaction process of gravel through vibration, thereby speeding up the repair speed and reducing the economic losses caused by closing the road during the repair process.

[0134] Example 4

[0135] A pavement construction method adopted by the present invention is applied to any one of the pavement structures with self-repairing function in Examples 1 to 2, comprising the following steps:

[0136] 1. Prefabricate the structural layer 2 in the factory; transport the structural layer 2 to the construction site;

[0137] 2. Install the structural layer 2 to the designated position; inject sand into the sand storage cavity 21.

[0138] In step one, the pavement layer 1 can be prefabricated together with the structural layer 2, or it can be constructed on site; the specific size of the prefabricated structural layer 2 depends on the actual manufacturing, transportation and lifting capabilities; when the structural layer 2 is the steel box structure in Example 2, in this step, only the sub-steel boxes 25 can be prefabricated separately, and the assembly of the sub-steel boxes 25 can be arranged after this step.

[0139] In step 2, sand injection can be performed by means of rotary spraying, or vibration can be used during sand injection to evenly spread the sand in the sand storage chamber 21; sand injection can be performed on the constructed structural layer 2 after each section of the structural layer 2 is constructed, or sand injection can be performed uniformly after all the structural layers 2 are constructed; if the structural layer 2 is the steel box structure in Example 2, then in the next step, the connecting buckles 4 can be used to quickly assemble the sub-steel boxes 25, and the specific steps are as follows:

[0140] S21, such as Fig.11 As shown, the longitudinal connecting piece 42 of the connecting buckle 4 is facing upwards, and the transverse connecting piece 41 is facing downwards and is placed into the sub-steel box 25 from the second limiting groove 253;

[0141] S22. Press the connecting buckle 4 downward, and the relative angle between the longitudinal connecting member 42 and the transverse connecting member 41 of the connecting buckle 4 will change. The transverse connecting member 41 will move along the longitudinal direction of the road toward the end of the first limiting groove 252 away from the second limiting groove 253 until it contacts, and the longitudinal connecting member 42 will move toward the second limiting groove 253 until it contacts; at this time, the transverse connecting member 41 can connect the two adjacent sub-steel boxes 25 on both sides of it along the longitudinal direction of the road, and the longitudinal connecting member 42 can connect the adjacent sub-steel boxes 25 along the longitudinal direction of the road.

[0142] S23, covering the paving layer 1 on the top of the structural layer 2, thereby covering the longitudinal connecting piece 42 of the connecting buckle 4, and relatively fixing the connecting buckle 4 and the structural layer 2.

[0143] When it is necessary to remove or replace one of the sub-steel boxes 25, the following steps can be followed:

[0144] S31, scraping off the pavement layer 1 at the corresponding connection buckles 4 at the four corners of the sub-steel box 25 to be removed or replaced;

[0145] S32, lift and remove the connection buckles 4 at the four corners of the sub-steel box 25 to be removed or replaced;

[0146] S33, removing the sub-steel box 25 to be removed or replaced from its original position; installing a new sub-steel box 25;

[0147] S34, reinstall the connecting buckles 4 on the four corners of the new sub-steel box 25;

[0148] S35, re-paving the pavement layer 1 removed in step S31.

[0149] The construction method of this embodiment selects to prefabricate the structural layer 2 in the factory, and then injects sand into the sand storage cavity 21 after the structural layer 2 is installed in place, which can reduce the weight of the structural layer 2 during transportation, thereby reducing the difficulty of transporting the structural layer 2.

[0150] And when the structural layer 2 is the steel box structure in Example 2, the construction method of this embodiment can also use the connecting clips 4 to quickly assemble the sub-steel boxes 25, thereby speeding up the assembly speed of the steel box structure and improving construction efficiency; correspondingly, this embodiment can also quickly dismantle the sub-steel boxes 25 through the connecting clips 4.

[0151] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A pavement structure with self - repair function, comprising a paving layer (1) and a structural layer (2); It is characterized in that, The structural layer (2) includes a sand storage cavity (21); the sand storage cavity (21) can be used to store gravel; the bottom surface of the structural layer (2) is distributed with sand leakage holes (22); both ends of the sand leakage holes (22) are respectively communicated with the sand storage cavity (21) and the base layer (3); The structural layer (2) is a steel box structure; the steel box structure includes several sub - steel boxes (25); the sub - steel boxes (25) are continuously distributed along the longitudinal and transverse directions of the road; two adjacent sub - steel boxes (25) along the longitudinal direction of the road can swing relatively; the axis of the swing is along the transverse direction of the road; It also includes a connecting buckle (4); the connecting buckle (4) is arranged at the intersection of four sub - steel boxes (25) adjacent to each other along the longitudinal and transverse directions of the road; the connecting buckle (4) includes a transverse connecting piece (41) and a longitudinal connecting piece (42); the transverse connecting piece (41) and the longitudinal connecting piece (42) are hinged; the axis of the hinge connection is along the transverse direction of the road; the transverse connecting piece (41) is used to connect two adjacent sub - steel boxes (25) along the transverse direction of the road; the longitudinal connecting piece (42) is used to connect two adjacent sub - steel boxes (25) along the longitudinal direction of the road; The transverse connecting piece (41) includes a limiting column (411) arranged along the transverse direction of the road; corresponding first limiting grooves (252) are arranged on the corresponding side walls of two adjacent sub - steel boxes (25) along the transverse direction of the road; both ends of the limiting column (411) are respectively installed in the corresponding first limiting grooves (252); baffles (412) are also arranged at both ends of the limiting column (411); the baffles (412) are used to prevent two adjacent sub - steel boxes (25) along the transverse direction of the road from moving away from each other; Both ends of the longitudinal connecting piece (42) along the longitudinal direction of the road are provided with limiting plates (421); corresponding second limiting grooves (253) with corresponding shapes are arranged at the corresponding positions of the top plates of two adjacent sub - steel boxes (25) along the longitudinal direction of the road; the limiting plates (421) are installed in the corresponding second limiting grooves (253).

2. A pavement structure with self - repair function according to claim 1, It is characterized in that, When a vehicle passes along the pavement structure with self - repair function, the gravel in the sand storage cavity (21) can leak out from the sand leakage holes (22) and be compacted.

3. A pavement structure with self - repair function according to claim 1, It is characterized in that, The sand storage cavity (21) also includes a sand injection hole (23); the sand injection hole (23) is used to inject sand into the sand storage cavity (21).

4. A pavement structure with self - repair function according to claim 3, It is characterized in that, The sand injection hole (23) is arranged on the top surface of the structural layer (2).

5. A pavement structure with self - repair function according to claim 4, It is characterized in that, A hole plug (24) is detachably connected to the sand injection hole (23).

6. A pavement structure with self - repair function according to claim 1, characterized in that, a snap - in entrance is provided on the top surface of the sub - steel box (25); a longitudinal groove is provided inside the sub - steel box (25); one end of the longitudinal groove facing the snap - in entrance is open; an installation structure for connecting the transverse connecting member (41) is provided at the end of the longitudinal groove far from the snap - in entrance; the transverse connecting member (41) can enter the longitudinal groove inside the sub - steel box (25) through the snap - in entrance and be connected to the installation structure.

7. A pavement structure with self - repair function according to claim 1, characterized in that, the connecting snap (4) further includes a connecting section (43); the transverse connecting member (41) and the longitudinal connecting member (42) are respectively hinged to both ends of the connecting section (43); the axis of the hinge connection is along the transverse direction of the road.

8. A pavement structure with self - repair function according to any one of claims 1 to 7, characterized in that, a convex structure (26) is distributed on the surface of the structural layer (2) facing the base layer (3); the convex structure (26) can be inserted into the base layer (3).

9. A pavement structure with self - repair function according to claim 8, characterized in that, the convex structure (26) is an annular member; the number and position of the convex structure (26) match the number and position of the sand leakage holes (22).

10. A pavement structure with self - repair function according to any one of claims 1 to 7, characterized in that, the distance between two adjacent sand leakage holes (22) is Dd; 30 cm ≤ Dd ≤ 50 cm.

11. A pavement structure with self - repair function according to any one of claims 1 to 7, characterized in that, the diameter of the sand leakage hole (22) is Ds; 5 cm ≤ Ds ≤ 10 cm.

12. A pavement structure with self - repair function according to any one of claims 1 to 7, characterized in that, ventilation holes are further provided in the upper part of the side wall of the structural layer (2); the ventilation holes are communicated with the sand storage cavity (21).

13. A pavement structure with self - repair function according to any one of claims 1 to 7, characterized in that, the structural layer (2) is further provided with a lifting structure; the structural layer is further provided with a lifting structure; the lifting structure is used to lift the corresponding section of the structural layer (2).

14. A pavement structure with self - repair function according to claim 13, characterized in that, when a sand injection hole (23) is provided on the sand storage cavity (21), the sand injection hole (23) serves as the lifting structure.

15. A pavement repair method, characterized in that, applied to a pavement structure with self - repair function according to any one of claims 1 to 14, comprising the following steps: A. Lift the corresponding part of the structural layer (2) to the specified elevation; B. Vibrate the structural layer (2) until the sand and gravel fill the void cavity (31) and reach the predetermined compaction degree.

16. A pavement construction method, characterized in that, Applied to a pavement structure with a self-healing function described in any one of claims 1 to 14, comprising the following steps: I. Factory prefabricate the structural layer (2); transport the structural layer (2) to the construction site; II. Install the structural layer (2) at the designated position; inject sand into the sand storage cavity (21).

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