26 results about "Reflective crack" patented technology

The invention discloses a white and black pavement structure exterior and interior disease one-key plotting method oriented to pavement health management, and relates to the technical field of road engineering detection and maintenance. Reflection crack tracing is realized based on an interlayer disease conduction rule by establishing a cement board joint coordinate system; the method comprises the following steps: determining the types of broken slabs and slab corner fractures by utilizing the spatial geometrical relationship between cracks and joints, calculating indexes such as a load transfer coefficient, a reflection crack rate, a slab breakage rate and a pavement condition index, and generating a visual result containing disease distribution and performance parameters in a linkage manner. According to the method, the traditional single structure layer analysis limitation is broken through, the reflection crack recognition accuracy rate exceeds 92%, the broken plate judgment accuracy rate reaches 94% or above, the batch data processing time complexity is optimized to O (n + m), the single road section analysis time is shortened to be within 5 minutes from 2 hours, the problems of low manual detection efficiency, large errors and the like are effectively solved, and quantitative support is provided for precise maintenance of white and black pavements.

This invention provides a construction method for improving the drainage capacity of road structures, relating to the field of drainage function technology for the renovation and upgrading of old roads. It separates water bodies between the upper and lower structural layers and the original ground surfaces on both sides of the road structure layer by forming an emulsified asphalt layer and waterproof geotextile. A rapid drainage structure is formed using a concrete pavement crushed stone layer, filled with crushed stone, drainage geogrids, sidewalk rubble, a filter layer, and drainage pipes. This achieves rapid drainage of the road structure, ensuring the stability of the road structure layer in the renovation of old pavements, reducing differential settlement caused by groundwater and other factors, and avoiding disturbance to the road and the resulting reflective cracks. This invention improves the drainage performance at the junction of sidewalks and roads, reducing water disturbance problems.

The utility model discloses an anti-reflection crack structure of a white and black road pavement. The anti-reflection crack structure comprises a concrete layer, a double-twisted reinforced steel wire mesh, a bonding layer, a stone chip layer and a first asphalt layer which are sequentially arranged from bottom to top. According to the utility model, the pavements are paved through the twisted-pair reinforced steel wire meshes, and uneven stress caused by a load effect is transmitted to the twisted-pair reinforced steel wire meshes, so that the effects of buffering, counteracting and reducing the uneven stress are achieved, the overall stress is uniform, the integrity is enhanced, and the service life of the pavement is prolonged. Spreading of the stone chips generates the effect similar to concrete surface scabbling, the integrality among the concrete layer, the double-twisted reinforced steel wire mesh and the first asphalt layer is enhanced, and therefore block sliding and cracking caused by the horizontal acting force of the road surface can be avoided.

The invention provides an asphalt overlay material and a preparation method thereof. The asphalt overlay material comprises the following raw materials in parts by mass: 12-18 parts of high-viscosity and high-elasticity modified asphalt, 75-82 parts of aggregate and 0.5-2 parts of an additive, the dynamic viscosity of the high-viscosity and high-elasticity modified asphalt at 60 DEG C is 300,000-500,000 Pas, the ductility at 5 DEG C is 35-45 cm, and the elasticity recovery at 25 DEG C is greater than or equal to 95%; intermittent grading is adopted in the aggregate, and the additives are an anti-stripping agent and a warm mixing agent. The material is suitable for 1.0-1.5 cm ultra-thin overlay engineering, the reflection crack fatigue life is larger than or equal to 1200 times of circulation, the dynamic stability at 60 DEG C is larger than or equal to 4300 times / mm, the low-temperature flexural-tensile strain at-10 DEG C is larger than or equal to 3500 [mu] m, reflection cracks can be effectively inhibited, the service life of a pavement can be effectively prolonged, construction is efficient and energy-saving, and the material is suitable for various scenes such as a dry area, a wet area, a seasonal freezing area and heavy traffic.

The invention discloses a pavement crack treatment auxiliary decision-making method based on pavement surface-interior cooperative detection. According to the method, road surface and internal data are synchronously collected through integrated equipment, cracks are accurately positioned by adopting a pixel-level longitude and latitude mapping method based on spherical geometry, and a dynamic threshold model fusing multi-dimensional information such as road service life, traffic load, climate and maintenance history is constructed. The relevance between the road surface and the internal crack is scientifically judged, and the road surface and the internal crack are accurately divided into a fatigue crack, a reflection crack and a through crack. On the basis, according to the method, the road condition is evaluated through the quantitative evaluation index S, and a targeted treatment scheme is formed in combination with the crack type and number, so that the problem of improper or incomplete treatment caused by inaccurate judgment in traditional maintenance is effectively solved, and the treatment effect is remarkably improved.

The invention relates to a liquid supplementing and slurry extracting construction process based on a graded broken stone structure and application of the liquid supplementing and slurry extracting construction process, and belongs to the technical field of road engineering. The process provided by the invention is suitable for transforming a low-grade cement road into an asphalt pavement under medium and light traffic volume, adopts an embedded compact grading design, adopts a plant mixing method to mix graded broken stones, and adopts a liquid supplementing and slurry extracting process to improve the modulus of a graded broken stone layer, so that the upward development of reflection cracks can be effectively inhibited and delayed, and the pavement quality is improved. And in addition, the construction cost of the reconstruction scheme is low, the reconstruction speed is high, and the construction period is short.

The utility model discloses a base section construction joint road structure for preventing reflection crack, which comprises two sections of base layers and high-strength cement blocks, the high-strength cement blocks are arranged between the two sections of base layers, the inner sides of the two sections of base layers are provided with base grooves, the inner sides of the base grooves are provided with rectangular grooves, the inner sides of the rectangular grooves are provided with steel support plates, and the steel support plates are provided with grooves. The utility model discloses a glass fiber net structure, it is equipped with high-strength cement block, the reinforcing subassembly is equipped with the high-strength cement block, the reinforcing subassembly is used for reinforcing the junction of two sections of base course, the reinforcing subassembly includes high-strength complete plate, even if the glass fiber net is damaged, when the junction outside the base course suffers from big extrusion, through the high-strength complete plate support, the base course will not be damaged, and the base course will not be damaged. The high-strength complete plate is of a high-strength complete structure and replaces base layer mortar to be installed at the joint of the two base layers, so that the situation of reflection cracks is effectively avoided, the high-strength complete plate is supported through the steel supporting plate, and the situation that the high-strength complete plate is extruded and inclines is avoided.

The invention relates to the technical field of road engineering, in particular to a method and system for predicting the service life of a semi-rigid base pavement structure, and the method comprises the steps: obtaining crack related data of a target pavement and operation data reflecting the service conditions of the pavement; based on the crack related data, crack state parameters used for representing the reflection crack development state in the target pavement are determined; based on the crack state parameters and the operation data, a prediction model of the crack development state changing along with the pavement service condition is established; and setting an end-of-life criterion corresponding to the crack state parameter, and when a prediction result of the prediction model meets the end-of-life criterion, determining the structural service life of the target pavement. According to the invention, the problems of low crack development prediction precision and incapability of dynamically adapting to the change of service conditions in the prior art are effectively solved, and the accuracy and adaptability of pavement life prediction are remarkably improved.

This invention relates to the field of road surface settlement prevention technology and discloses a method for preventing settlement of the road surface at the edge of a basement. This method includes the following steps: First, the excavated surface of the basement is backfilled and compacted in layers until the compaction degree meets the design requirements; after backfilling the excavated surface to a suitable position at the top of the basement, a 20cm thick C30 reinforced concrete anti-settlement slab is constructed; after the anti-settlement slab is poured and cured, a 2m wide geogrid is symmetrically laid along its edges to prevent reflective cracking at the joints. This method for preventing settlement of the road surface at the edge of a basement can effectively solve the problem of uneven settlement of the road surface around the basement in residential areas. In addition, this method can reduce the impact of vehicle impact loads on the basement exterior walls, ensure the strength, rigidity, and stability of the roadbed, improve the bearing capacity of the roadbed and pavement, and fully guarantee the design service life of the road.

The invention belongs to the technical field of road engineering maintenance, and particularly relates to a treatment method for heavy traffic road pavement reflection cracks. According to the method, accurate targeted repair is achieved in the mode that the discrete milling areas are arranged along the crack at intervals, whole-line milling is avoided, and the construction cost is effectively saved. A grouting pipe penetrating into a base layer is used for grouting, a middle-layer macroporous asphalt mixture stress absorption layer and a surface-layer asphalt mortar functional layer are combined, and a crack source for anchoring a crack from the bottom and adopting a high-strength slurry anchor cable is constructed; stress is eliminated in the middle, the stress of the pavement is absorbed by adopting a flexible material, and capillary water is prevented from rising; moisture is isolated at the top, and high-viscosity asphalt is adopted for complete sealing to prevent moisture from invading; therefore, the propagation path of the reflection crack is fundamentally blocked.

This invention relates to the technical field of road engineering, and in particular to a method for converting old road structures into long-life pavement structures based on low-carbon cold recycling, comprising the following steps: S1, milling and recycling of the old pavement layer; S2, conversion of the semi-rigid base course system by vibratory compaction using a road roller to convert the semi-rigid base course into a granular flexible subbase course; S3, injection of a semi-flexible isolation layer; injection of a highly permeable slurry into the crushed base course to form a flexible recycled isolation layer; S4, forming of the flexible recycled base course; uniformly spreading a mixture of milled recycled material and new aggregate on the isolation layer, and simultaneously spraying and injecting bio-based modified emulsified asphalt; S5, laying of a low-carbon surface layer; spraying a modified emulsified asphalt tack coat onto the surface of the flexible recycled base course, followed by spreading a rubber asphalt concrete surface layer, and finally compacting it. The construction method of this invention solves the problems of "high carbon emissions, rapid recurrence of reflective cracks, and short lifespan" in traditional old road reconstruction and expansion.

The application discloses a cement pavement "white to black" long-life epoxy asphalt thin-layer overlay and a construction method thereof. The epoxy asphalt thin-layer overlay structure is sequentially composed of a modified emulsified asphalt bonding layer, a 2cm AC-5 rich-oil modified asphalt mixture stress absorption layer and a 4cm AC-13 high-toughness plastic epoxy asphalt mixture surface layer from bottom to top. The core lies in that high-toughness plastic epoxy modified asphalt is used as a binder, which has excellent flexibility and strength. The structure can effectively reduce more than 50% of reflection cracks, and the road performance of the surface mixture is improved by more than 50% compared with ordinary asphalt mixture. The application realizes a total overlay thickness of only 6cm, reduces initial investment and material consumption, improves the durability of the pavement, prolongs the design service life by more than 50%, and solves the technical problems of thick overlay, easy damage and short service life in traditional "white to black" technology.

This utility model relates to the field of road paving technology and discloses a quick-release paver anti-segregation rubber baffle, including a rubber plate. Rectangular and L-shaped iron plates are respectively arranged on both sides of the rubber plate. Multiple iron chains are arranged at the bottom of the L-shaped iron plate. Multiple rubber fixing bolts, connecting bolt one, and connecting bolt two are threadedly connected inside the rectangular iron plate. One end of each of the multiple rubber fixing bolts extends through the interior of the rubber plate, and one end of each of the multiple connecting bolt two extends through the rubber plate and into the interior of the L-shaped iron plate. Multiple U-shaped buckles are arranged at the bottom of the L-shaped iron plate. In this utility model, the modular rubber plate and iron chains work together to adapt to the needs of different road conditions and are compatible with different gradations of water-stabilized mixtures. This significantly improves the smoothness and uniformity of the water-stabilized layer paving, reduces the risk of later reflective cracking, and simultaneously reduces material waste and the probability of rework.

The application provides an optimal design method of a fiber rubber macadam seal coat for inhibiting pavement reflection cracks, comprising the following steps: determining optimal fibers; determining optimal aggregate; using the amount of the optimal fibers, the scattering amount of the optimal aggregate and the amount of rubber asphalt as variables, preparing multiple groups of third test pieces through orthogonal test; combining the third test pieces with a base layer and an overlay layer with cracks to prepare fourth test pieces and perform reflection crack simulation test; and determining the combination of the optimal crack resistance materials according to the test results. The application takes the anti-reflection crack capacity of the fiber rubber asphalt macadam seal coat itself as the main evaluation index, and has the advantages of scientificity, rationality and accuracy compared with the prior art. The fiber rubber macadam seal coat obtained by the design method has excellent anti-reflection crack capacity, can significantly improve the crack resistance of the composite pavement, reduce the pavement maintenance and repair cost, prolong the service life of the pavement, and has a wide popularization and application prospect.

The invention provides a semi-flexible pavement structure which comprises a semi-flexible base layer and an asphalt mixture surface layer which are arranged from bottom to top, and the semi-flexible base layer comprises an embedding and extruding structure formed by laying fine-particle-size broken stones and large-particle-size broken stones in a layered mode and cement emulsified asphalt mortar poured into the embedding and extruding structure. The cement-emulsified asphalt mortar is paved 2-4 cm above the interlocking structure, the fine-particle-size broken stones and the large-particle-size broken stones are limestone, and the cement-emulsified asphalt mortar is formed by mixing cement, cationic slow-breaking and quick-setting emulsified asphalt, fine aggregate, water and an additive; the asphalt mixture surface layer sequentially comprises a lower surface layer, a middle surface layer and a surface layer from bottom to top. The pavement structure base layer has rigidity, ductility, elasticity and toughness, the surface layer rigidity is large, the pavement structure overall rigidity is large, the stability is good, and the technical problem that ruts and reflection cracks are prone to occurring on an asphalt pavement can be effectively solved.

The utility model belongs to the technical field of highway bridge and culvert engineering, and discloses a multi-span hole small bridge covering plate simply-supported-to-continuous structure which comprises a base, a side wall, a middle wall and a plurality of cover plates. According to the middle wall structure, the boss is arranged at the top end of the middle wall in the width direction of the base, the supporting stability of the middle wall to the cover plate is enhanced, the wall body thickness of the middle wall can be properly reduced so as to reduce the influence on a water cross section, the drainage capacity of a culvert is improved, the cost can be reduced, and water flow can be kept smooth. The cast-in-place connecting area is reserved between the adjacent cover plates, so that the embedded steel bar assemblies embedded in the cover plates can be welded and connected in the area, an integrated continuous structure is formed in combination with subsequent concrete cast-in-place, the problem of reflection cracks caused by deformation of a simply-supported structure at the top end of the middle wall is effectively solved, and the service life of the middle wall is prolonged. Therefore, the overall structural performance of the pavement is improved, road driving safety and comfort are guaranteed, and the service life of the pavement is prolonged.

The utility model discloses an expressway reconstruction and extension pavement structure, and belongs to the field of road reconstruction and extension, the expressway reconstruction and extension pavement structure comprises an original pavement, a paver, a milling machine and a grouting machine, the top of the original pavement is provided with a roadbed reinforcing layer, the top of the roadbed reinforcing layer is provided with a transition layer assembly, and the top of the transition layer assembly is provided with a surface layer assembly; by arranging the roadbed reinforcing layer, the transition layer assembly, the surface layer assembly, the paver, the milling machine and the grouting machine, the construction period is short, the influence on traffic is small, the timeliness requirement of expressway reconstruction and extension can be met, the bonding strength of new and old pavements is high, the quality problems of reflection cracks, uneven settlement and the like are effectively avoided, meanwhile, the construction cost is controllable, the construction efficiency is high, and the construction period is shortened. And the method has remarkable economic benefits and social benefits.

The invention relates to a high-strength bonding anti-cracking asphalt pavement covering structure based on asphalt activity excitation and a construction method of the high-strength bonding anti-cracking asphalt pavement covering structure, and belongs to the technical field of road engineering. The invention discloses a high-strength bonding anti-cracking asphalt pavement covering structure based on asphalt activity excitation. The high-strength bonding anti-cracking asphalt pavement covering structure sequentially comprises a finish milling treatment layer, a high-permeability modified waterproof bonding layer, a rubber asphalt stress absorption sealing layer and a high-performance overlay layer from bottom to top. The invention innovatively provides a three-in-one collaborative technical route of'interface activation-stress buffering-structure paving ', and is not locally improved by a single material or a working procedure; the core problems of weak interlayer bonding, frequent reflection cracks, interface performance attenuation and the like in the traditional overlay technology are systematically solved through a layer-by-layer progressive design of a finish-milling treatment layer, an interface activation interface of a high-permeability modified waterproof bonding layer, stress digestion of a rubber asphalt stress absorption sealing layer and a high-performance overlay strengthening structure; and the overall stability of the composite pavement is improved structurally and essentially.

This invention discloses a non-full-thickness cement pavement overlay material and its construction process. The non-full-thickness cement pavement overlay material is composed of basalt, shape memory particles, limestone powder, and high-elasticity modified asphalt. It can improve the crack resistance of the stress-absorbing layer, delay longitudinal reflective cracking, and extend the service life of the pavement. The construction process involves fine milling the cement pavement to create grooves on the surface; uniformly applying a high-strength interlayer adhesive across the entire pavement; then, spreading the non-full-thickness cement pavement overlay material on top of the high-strength interlayer adhesive as a stress-absorbing layer. This pavement structure can reduce the consumption of building materials such as stone and asphalt by approximately 30%, resulting in significant environmental and economic benefits. Finally, after the non-full-thickness cement pavement overlay material is constructed, a 4-5cm thick wearing layer is applied on top, effectively enhancing the surface wear resistance, extending the service life of the pavement, and improving driving comfort and safety.

This invention discloses a composite roadbed structure for shallow marine reclamation areas, relating to the field of land reclamation construction technology, aiming to solve the technical challenges of uneven settlement and reflective cracking in soft soil foundations in these areas. The structure provides rigid support through a pile foundation system embedded in the soft mud layer and innovatively employs support components with elastic restoring functions. Combined with a double-layer geogrid reinforcement and isolation system and a layered transition reinforcement layer, it forms a synergistic load-bearing system that combines rigidity and flexibility. This system effectively disperses loads, absorbs and reduces stress caused by differential settlement, and automatically adjusts its restoring function, thereby significantly suppressing the generation of reflective cracks in the pavement. This invention possesses excellent stability, adaptability, and durability, making it particularly suitable for rapid and efficient road infrastructure construction in shallow marine reclamation areas.

The invention discloses a preparation method of silver birch juice ferment. An anti-crack layer is of a composite fiber cloth structure and is laid between a base layer and an asphalt surface layer of an asphalt pavement; the composite fiber cloth comprises a reinforced fiber layer, a hot melting bonding layer and a wear-resistant protective layer which are sequentially compounded from inside to outside; the reinforced fiber layer is a blended fabric of glass fibers and polyester fibers; the hot melt bonding layer is a modified asphalt hot melt adhesive layer; and the wear-resistant protective layer is a polypropylene fiber non-woven fabric. The longitudinal tensile strength of the anti-crack layer is larger than or equal to 50 kN / m, tensile stress generated by base layer shrinkage can be effectively resisted, and reflection cracks are restrained; the hot melting bonding layer and the asphalt surface layer are fused and combined, the bonding strength is larger than or equal to 0.8 MPa, and interlayer delamination is avoided; the wear-resistant protective layer can bear construction loads such as rolling of a road roller, and the service life is synchronous with that of an asphalt pavement.

The application belongs to the technical field of road pavement, and particularly relates to a heavy-load traffic integrity anti-rutting pavement structure and a pavement method thereof. The pavement structure is arranged on a top surface of a roadbed. The pavement structure is sequentially composed of a semi-rigid lower base layer, a synchronous gravel seal coat, a rich-asphalt seal bottom protective layer, a combined semi-flexible anti-rutting layer and a surface wearing layer from bottom to top. The integrity anti-rutting pavement structure not only improves the bearing capacity of the pavement, but also strengthens the ability of the pavement to resist reflection cracks. The anti-rutting performance of the pavement structure is better, the integrity is better, the bearing capacity is stronger, and the pavement diseases such as rutting and cracks in a short period of time are effectively avoided, so that the service life of the pavement is greatly prolonged.

The utility model belongs to the technical field of highway bridge and culvert engineering, and discloses a multi-span hole assembly type cover plate small bridge and culvert structure which comprises a base, side walls, a middle wall and a cover plate. The side walls, the middle wall and the cover plate are all prefabricated parts and can be directly assembled on site, the site formwork erecting work is effectively reduced, the construction process is simplified, and the construction efficiency is improved. And by arranging the positioning assembly, quick alignment and accurate connection in the component mounting process are ensured. The middle wall is provided with the upper boss and the lower boss, the contact area between the middle wall and the cover plate and the contact area between the middle wall and the base are increased, the wall body thickness of the middle wall can be properly reduced, the influence on a water passing section is reduced, and the drainage capacity of the culvert is improved. The cover plate positioning holes and the cover plate positioning steel bars are matched in an inserted mode, and concrete pouring of the cast-in-place connecting areas between the adjacent cover plates is combined, so that rigid connection is formed between the cover plates and the middle wall, a simple supporting structure is converted into a continuous structure, reflection cracks generated between the cover plates are reduced, and the road driving quality is guaranteed.

The invention discloses a reconstruction and extension road for controlling differential settlement of a new roadbed and an old roadbed and a construction method. The method is used for solving at least one of the problems that in the prior art, a cement stabilized macadam base is extremely prone to cracking due to poor dry shrinkage and temperature shrinkage performance, modulus mismatching exists between a roadbed and the cement stabilized macadam base, and formation of reflection cracks is aggravated. The reconstruction and extension road comprises a composite foundation, an integral extension embankment, an integral extension roadbed, an anti-crack toughening type base layer, a rubber graded broken stone layer and an extension surface layer which are sequentially arranged from bottom to top. And first rubber particles are arranged in the rubber graded broken stone layer. The method can be used for road reconstruction and extension projects.

The utility model discloses an energy-saving and emission-reducing asphalt pavement internal and external disease maintenance structure, which is characterized by comprising a micro-surfacing structure, an original asphalt pavement structure and a grouting repair material, the original asphalt pavement structure comprises an upper surface layer, a middle surface layer, a lower surface layer, a base layer and a reflection crack, the upper surface layer is positioned on the outer surface of the lower end of the micro-surfacing structure, and the lower surface layer is positioned on the outer surface of the lower end of the micro-surfacing structure; the middle surface layer is located on the outer surface of the lower end of the upper surface layer, the lower surface layer is located on the outer surface of the lower end of the middle surface layer, the base layer is located on the outer surface of the lower end of the lower surface layer, the reflection cracks are cracks which are developed upwards from cracks of the base layer to the upper surface layer, and the grouting repair material is used for filling and compacting the reflection cracks. The energy-saving and emission-reducing asphalt pavement internal and external disease maintenance structure provided by the utility model is simple in structural principle, high in disease treatment efficiency and excellent in economical efficiency, and can effectively treat the internal and external diseases of a high-grade asphalt pavement and improve the anti-skid performance of a road surface.

The invention discloses a fracture mechanics-based semi-rigid base gravel softening opportunity determination method, which comprises the following steps: constructing a semi-rigid base asphalt pavement finite element simulation model, simplifying a pavement structure into a multi-layer elastic layered system, and inputting materials and structure parameters; based on fracture mechanics, calculating and analyzing the relationship between the crack density parameter and the stress intensity factor through a numerical simulation method, and determining a crack density parameter interval of surface layer reflection crack surge caused by semi-rigid base layer cracking; combining a crack density parameter with an asphalt pavement structural strength index to jointly construct a semi-rigid base gravel softening maintenance evaluation standard; and evaluating the existing quality of the existing semi-rigid base and the demanding degree of macadam softening, and determining the macadam softening maintenance time of the semi-rigid base. According to the method, the damage degrees of the base layer and the surface layer are considered, the pavement damage condition in the whole pavement thickness range is comprehensively analyzed, and whether the pavement semi-rigid base layer needs to be subjected to macadam softening or not is carefully considered.