64 results about "Pavement engineering" patented technology

The invention relates to the technical field of airport pavement project quality acceptance, in particular to an airport pavement project quality acceptance method and system based on three-dimensional laser scanning. The method comprises the following steps: firstly, acquiring an original point cloud data model of an airport pavement to be measured by using a three-dimensional laser scanner, and preprocessing data to generate a standardized three-dimensional point cloud model; according to a preset acceptance requirement, processing data required by acceptance by adopting a TIN construction technology, and extracting an average point location elevation and a plane coordinate of an acceptance area to form an elevation point cloud model; and the elevation point cloud model and the three-dimensional point cloud model are intelligently spliced, and a preset evaluation standard is combined, so that the pavement quality is automatically judged. According to the method, the problem of low data processing efficiency in a traditional acceptance method is solved, accurate modeling of a complex pavement structure is realized through a TIN construction technology, and the reliability of an acceptance result is improved; and more efficient and reliable technical support is provided for quality control of airport pavement engineering.

The invention provides a pavement flatness control system and method, electronic equipment and a storage medium, the system is suitable for a paver, and the system comprises a sensor module used for transmitting the collected height value, slope value and fluctuation change value of a pavement to a central control module; the central control module is used for acquiring a first difference value between the height value and the slope value of the road surface and a preset paving thickness reference and a second difference value between the fluctuation change value and a preset flatness threshold value, acquiring a flatness deviation value based on the first difference value and the second difference value, and generating a regulation and control instruction based on the flatness deviation value; and the execution module is used for adjusting parameters of the paver according to the received regulation and control instruction so as to control the flatness of the pavement. According to the paver, the real-time data of the pavement are collected in real time through the sensor module, the parameters of the paver are adjusted in combination with the central control module and the execution module, full-automatic and high-response pavement flatness control is achieved, the construction quality and efficiency are improved, and the harsh standard of pavement engineering is met.

The present invention relates to the technical field of pavement engineering. Disclosed are a pavement distress detection method and apparatus, a device and a medium. The method comprises: carrying out distress detection on a pavement radar image respectively on the basis of a well-trained large-object detection model and a well-trained small-object detection model, to correspondingly obtain a large-object detection result and a small-object detection result, respectively; and fusing the large-object detection result and the small-object detection result to determine a distress detection result of the pavement radar image, wherein the large-object detection model comprises a deformable convolution layer, a dual-path detection head, and a soft non-maximum suppression operation layer, and the small-object detection model comprises a multi-scale convolutional layer, a deformable ROI pooling layer, a dual-path detection head, a balanced line loss function, and a soft non-maximum suppression operation layer. The structure and corresponding function of a dual-path object detection model are controlled in a targeted manner, and detection results of the two paths are fused, such that the reliability of a final distress detection result is guaranteed.

The invention discloses a graphene asphalt modifier based on a micelle coating technology and a preparation method thereof, and belongs to the technical field of road materials. The modifier is prepared from reduced graphene oxide (rGO) serving as a core function phase, a micelle coating phase (compounded by polystyrene-polyoxyethylene block copolymer and ionic liquid) and an auxiliary modification phase (nano silicon dioxide and a silane coupling agent) according to the mass ratio of 10: (30-50): (5-10). The preparation method comprises the following steps: preparation and reduction of graphene oxide, preparation of an amphiphilic micelle solution, preparation of micelle-coated rGO composite particles and compounding of an auxiliary modified phase. The modifier can significantly improve the dispersibility and compatibility of graphene in asphalt, effectively prevent agglomeration, and synchronously improve the high and low temperature performance, aging resistance, water damage resistance and self-ice-melting performance of asphalt. The process is simple and convenient, is compatible with an existing asphalt production line, and is suitable for high-grade pavement engineering.

The invention discloses a preparation method of a graphene modified asphalt concentrated solution, and belongs to the technical field of road materials. According to the method, the graphene modified asphalt concentrated solution with high dispersity and high stability is prepared through the optimized component formula and the process steps of stripping firstly and stabilizing secondly. The concentrated solution is prepared from graphene, a dispersing agent, a stabilizing agent and carrier oil, and the mass ratio of the graphene is 1%-15%. The preparation method comprises the following steps: performing mechanical stirring and ultrasonic treatment on the graphene in the carrier oil to realize pre-dispersion and stripping; then adding a stabilizer, and performing high-speed shearing to refine and stabilize; and finally, carrying out homogenization treatment to obtain a finished product. The concentrated solution has excellent storage stability, can be quickly and uniformly dispersed in asphalt, is convenient to use and is suitable for different engineering scenes. When the modified asphalt is used for modifying matrix asphalt, the high-temperature stability, low-temperature crack resistance and aging resistance of the asphalt can be remarkably improved, and the modified asphalt is suitable for long-service-life pavement engineering such as high-grade highways and airport runways.

The invention discloses a pavement load analysis method based on discrete elements and a related device, and the method comprises the steps: collecting geometric features and material parameters of an asphalt pavement, and constructing a discrete element model; based on the constructed discrete element model, creating a rigid load plate in the target area, and simulating a tire-road contact surface; a target load is applied through a rigid load plate, displacement field distribution under the action of the load is calculated based on a discrete element model subjected to the load, and settlement response analysis is achieved. The discrete element model of the asphalt pavement is established on a physical scale closer to reality, and interlayer and particle contact conditions are flexibly defined through fine unit division; on the premise of reducing the cost, the transmission path and the distribution characteristic of the dynamic load in an actual pavement structure and the complex internal mechanical response caused by the transmission path and the distribution characteristic can be more accurately captured, and powerful support is provided for comprehensive improvement of scientificity, reliability and precision of pavement engineering design and accurate prediction of pavement diseases.

The invention discloses a coring manipulator for pavement engineering testing, and relates to the technical field of pavement engineering testing, the coring manipulator comprises a cart and a drilling cutter, a support frame is vertically and slidably connected with a moving block, the support frame is rotatably connected with a first lead screw, and the first lead screw is in threaded connection with a rotating cylinder; the side wall of the rotating cylinder is fixedly connected with a first bevel gear and a second bevel gear, the two sides of the first bevel gear are engaged with third bevel gears, the third bevel gears are fixedly connected with second lead screws, the second lead screws are in threaded connection with spiral sleeves, the spiral sleeves are fixedly connected with limiting blocks, and limiting blocks are slidably connected into the moving blocks. The support frame is fixedly connected with a trigger block; the two sides of the cart are slidably connected with first sliding rods, the first sliding rods are in threaded connection with third lead screws, the second bevel gears are meshed with fourth bevel gears, the first sliding rods are slidably connected with second sliding rods, and the second sliding rods are connected with first clamping blocks. The device has the effect of improving the working efficiency and the road core surface quality.

The invention relates to the technical field of intelligent sensing systems, and discloses a method and a device for detecting the bearing capacity of a pavement engineering construction material, and the method comprises the steps: synchronously collecting a mixed signal and a pure noise signal through a main measurement sensor and a reference noise sensor, constructing a multi-dimensional observation matrix, and carrying out the centralization and whitening preprocessing, thereby obtaining the bearing capacity of the pavement engineering construction material. And blind source separation is carried out by adopting an independent component analysis algorithm based on maximized non-Gaussian property, a target bearing capacity response signal with a super Gaussian characteristic is identified according to a kurtosis value of each source signal component, and then a dynamic deformation modulus is calculated. The system comprises a sensor array module, a synchronous acquisition module, a data processing module based on FPGA hardware acceleration and a result output storage module. According to the invention, strong coherent vibration noise can be effectively suppressed, signal details are completely reserved, and high-precision and real-time bearing capacity detection is realized.

The utility model relates to the technical field of road surface drilling, and discloses a road surface engineering drilling device which comprises a base, an opening is formed in the base, a horizontal moving assembly is arranged in the opening, a box body is arranged at the driving end of the horizontal moving assembly, a moving plate is installed in the box body through a lifting driving assembly, and the lifting driving assembly is connected with the moving plate. A movable plate is arranged on the box body, a punching assembly is installed on the movable plate, a dustproof cover is arranged on the periphery of the drilling end of the punching assembly, the box body is further provided with a fixing plate, an air blowing assembly is arranged above the fixing plate, a lifting driving device is arranged below the fixing plate, and an air outlet head is arranged at the driving end of the lifting driving device. According to the device, through the arranged lifting driving device, the air outlet head can be driven to move into the hole to blow broken stones in the hole, subsequent use is prevented from being affected, and the problems that in the prior art, broken stones are left in the hole, and insertion of subsequent rod-shaped objects is affected are solved.

The embodiment of the utility model provides a novel abrader, which relates to the field of airport cement pavement engineering, and comprises a mounting platform, a driving mechanism and a walking wheel group, the mounting platform is used for supporting and positioning a to-be-tested concrete roadbed; the driving mechanism is fixed on the mounting platform; the walking wheel set comprises a mounting frame and a plurality of directional rubber wheels, the mounting frame is connected with the driving mechanism, and the directional rubber wheels are all fixed to the mounting frame and distributed around the preset axis at intervals. The extension line of the wheel shaft of each directional rubber wheel is vertically intersected with a preset axis; and the driving mechanism is used for driving the mounting frame and the directional rubber wheels to rotate around a preset axis. According to the design of the wear meter, the test process can better conform to the real service condition of airport concrete, so that the accuracy and the reliability of a test result are improved.

The application discloses a kind of anti-cracking performance evaluation method and computer equipment for asphalt stress absorbing layer, it is related to pavement engineering technical field, the method includes: stress absorbing layer test piece is carried out oblique shear test, and index information in the process of oblique shear test is collected, the index information includes shear angle, stress load, vertical displacement, lateral displacement, interlayer dislocation displacement and stress absorbing layer adhesion force;According to the index information, the interlayer adhesion coefficient and interlayer stress absorbing coefficient of the stress absorbing layer test piece are calculated;According to the interlayer adhesion coefficient and interlayer stress absorbing coefficient, the anti-cracking performance of the stress absorbing layer test piece is evaluated.The application can introduce the interlayer adhesion coefficient and interlayer stress absorbing coefficient of stress absorbing layer test piece, and accurately evaluate the anti-cracking performance of asphalt stress absorbing layer.

This invention provides a photocatalytically modified asphalt based on waste rubber powder and its preparation method. The modified asphalt achieves this by precisely controlling the ratio of waste rubber powder, matrix asphalt, and a smoke suppressant made of graphite-phase carbon nitride. Simultaneously, a segmented gradient temperature-controlled calcination process is employed to prepare graphite-phase carbon nitride with a specific band gap. This ensures good interfacial compatibility among the raw material components, stable system formulation, and uniform and controllable precursor pyrolysis and polymerization reactions. Consequently, the graphite-phase carbon nitride possesses both porous physical adsorption and visible light photocatalytic activity. This allows for efficient adsorption and long-lasting photocatalytic degradation of asphalt fumes while fully preserving the excellent road performance and workability of the waste rubber powder-modified asphalt. The final product is a photocatalytically modified asphalt with simple components, controllable cost, excellent compatibility, long-lasting and stable smoke suppression effect, good process repeatability, and suitability for industrial mass production and widespread application in highway pavement engineering.

The utility model relates to the technical field of pavement engineering detection experiment devices, in particular to a portable core drilling machine loading and unloading device. Comprising a support of a frame structure and a chain block arranged at the upper end of the support, the support comprises two front stand columns arranged in parallel, two rear stand columns arranged in parallel, a cross beam fixedly connected between the two front stand columns or the two rear stand columns, and longitudinal beams fixedly connected between the front stand columns and the rear stand columns; a telescopic rod capable of stretching out and drawing back downwards is installed on the front stand column, a front walking wheel is installed at the lower end of the telescopic rod, and rear walking wheels are installed at the lower ends of the two rear stand columns. The device is firm in structure and convenient to use, manual carrying is not needed when the concrete coring machine is loaded and unloaded, labor can be saved, personnel safety is guaranteed, the requirement for the height of a transport carriage is not limited to the lifting amplitude of a working platform of the coring machine any more, and adaptability is high.

The invention relates to an AI (artificial intelligence)-based quick highway inspection method and system. The system comprises a mobile device, a camera and a controller, wherein the camera and the controller are arranged on the mobile device; a controller for controlling the mobile device to travel along a target road; the controller is also used for controlling the mobile equipment to carry out civil engineering inspection and greening engineering inspection; civil engineering inspection includes pavement engineering inspection, traffic safety engineering inspection, roadbed engineering inspection, drainage engineering inspection and protection engineering inspection. The controller can control the mobile device to carry out civil engineering inspection and greening engineering inspection. And for the inspection digital image of each inspection project, using artificial intelligence (AI) identification software and machine learning algorithm software of engineering diseases to determine the disease type and area in each inspection project. The inspection efficiency is obviously improved, the inspection accuracy is improved, and the inspection cost is reduced.

The application discloses an airport road pavement multi-load coupling impact toughness dynamic detection method and relates to the technical field of airport pavement engineering detection. The application discloses an airport road pavement multi-load coupling impact toughness dynamic detection method and relates to the technical field of airport pavement engineering detection. The application discloses an airport road pavement multi-load coupling impact toughness dynamic detection method and relates to the technical field of airport pavement engineering detection. The application discloses an airport road pavement multi-load coupling impact toughness dynamic detection method and relates to the technical field of airport pavement engineering detection. The application discloses an airport road pavement multi-load coupling impact toughness dynamic detection method and relates to the technical field of airport pavement engineering detection. The application discloses an airport road pavement multi-load coupling impact toughness dynamic detection method and relates to the technical field of airport pavement engineering detection. The application discloses an airport road pavement multi-load coupling impact toughness dynamic detection method and relates to the technical field of airport pavement engineering detection. The application discloses an airport road pavement multi-load coupling impact toughness dynamic detection method and relates to the technical field of airport pavement engineering detection. The application discloses an airport road pavement multi-load coupling impact toughness dynamic detection method and relates to the technical field of airport pavement engineering detection. The application discloses an airport road pavement multi-load coupling impact toughness dynamic detection method and relates to the technical field of airport pavement engineering detection. The application discloses an airport road pavement multi-load coupling impact toughness dynamic detection method and relates to the technical field of airport pavement engineering detection. The application discloses an airport road pavement multi-load coupling impact toughness dynamic detection method and relates to the technical filed of airport pavement engineering detection. The application discloses an airport road pavement multi-load coupling impact toughness

The utility model discloses a detection sampling system for pavement engineering, which comprises a main body piece, a sampling piece and a plurality of positioning pieces, the plurality of positioning pieces can rotate according to the pavement working condition of an operation area, and when the plurality of positioning pieces respectively rotate to different angles and are inserted into the operation area, the stable positioning of the main body piece is formed; the main body piece is effectively prevented from sliding back and forth and left and right, and the situation that the main body piece is driven to move in the vertical direction by the counter-acting force borne by the main body piece when the sampling piece carries out sampling operation is avoided, so that the sampling piece can always carry out sampling operation with the main body piece as a reliable operation basis, the operation reliability is improved, and the sampling efficiency is improved. The detection sampling system is simple in structure and convenient to operate, reduces labor intensity of operators, can adapt to working conditions of pavement engineering through rotation of the positioning part especially in the face of complex working conditions, adaptively performs positioning operation of the whole detection sampling system through reliable positioning points, and is higher in operability.

The invention relates to the technical field of pavement engineering, and discloses an asphalt pavement crack repairing and milling machine. Comprising a vehicle body and a dust cover installed at the front end of the vehicle body, and a first storage box, a second storage box, a third storage box, a stirring box and an air blowing device are further arranged in the vehicle body. A milling cylinder is mounted in the dust cover; and a first conveying belt and a second conveying belt are further arranged behind the milling cylinder. A first discharging port and a second discharging port are formed in the bottom of the vehicle body, and the first discharging port is located in front of the second discharging port. The width of the first discharge port and the width of the second discharge port are the same as the width of the milling cylinder. A first air suction port is further formed in the vehicle body in the dustproof cover, the rear portion of the first air suction port is communicated with a second storage box, and a second air suction port is formed in one side of the second conveying belt and connected with the second storage box. The stirring box is communicated with the first storage box, and the second storage box is connected with the second discharge port. A blowing opening is further formed in one side of the second conveying belt. And the stirring box is communicated with the first storage box and the third storage box. The construction process of highway pavement milling and asphalt filling can be completed, old highway materials can be effectively recycled, the old highway materials and new asphalt materials are mixed to achieve regeneration of the old highway materials, the material utilization rate is increased, and pollution and old highway material loss caused by flying dust in the cutting process are reduced.

The invention belongs to the technical field of pavement engineering materials, and particularly relates to a rubber and plastic composite material preparation process and manufacturing equipment thereof, and the rubber and plastic composite material preparation process comprises the following specific steps: S10, raw material pretreatment: S11, preparation of various raw materials; s12, regenerated plastic treatment: crushing polyethylene regenerated plastic and polypropylene regenerated plastic to 80-100 meshes, putting into an alkali washing tank, soaking with a sodium hydroxide solution to remove surface oil stains and impurities, then washing with clear water to be neutral, and feeding into a drying cylinder; s13, rubber treatment: freezing and crushing butadiene styrene rubber to 50-80 meshes, and adding nano calcium carbonate and an ethylene-vinyl acetate copolymer for premixing; and S14, preparing rubber oil: heating naphthenic rubber oil for later use, and by arranging a middle-section mixing convex edge in the segmented cooling extrusion unit, the regenerated rubber and plastic material interface bonding force is enhanced, and the mechanical property uniformity is improved.

The invention discloses an environment-friendly modified waste refractory material high-performance asphalt mixture as well as a preparation method and application thereof. The mixture is obtained by heating and mixing asphalt, coarse and fine aggregate and a cyclodextrin-fluorosilane double modified waste refractory material. The cyclodextrin-fluorosilane dual-modified waste refractory material is prepared by a three-step method: firstly carrying out amino silanization on the waste refractory material by using (3-aminopropyl) triethoxy silane, then carrying out grafting reaction with gamma-cyclodextrin / epoxy chloropropane, and finally, carrying out end capping by using trifluoropropyl methyl triethoxy silane, so as to obtain the cyclodextrin-fluorosilane dual-modified waste refractory material. And forming a material with a gradient structure of an inner core inorganic framework, a middle cyclodextrin layer and an outer layer fluoroalkyl shell. The use of traditional mineral powder is reduced, and meanwhile, the high-temperature stability, the water immersion stability and the safety of the asphalt mixture are improved. The method is suitable for pavement engineering of expressways and humid and rainy areas, and unification of solid waste high-value utilization and ecological environmental protection is achieved.

The invention relates to the technical field of building materials, and particularly discloses anti-cracking self-leveling mortar and a preparation method thereof. The invention discloses anti-cracking self-leveling mortar, which is specifically prepared from the following ingredients in parts by weight: 10 to 14 parts of cement, 8 to 10 parts of quartz sand, 3 to 5 parts of silica fume, 0.1 to 0.3 part of redispersible latex powder, 0.02 to 0.06 part of water-retaining agents, 0.2 to 0.4 part of flatting agents, 0.4 to 0.8 part of anti-cracking agents and 0.02 to 0.06 part of water reducing agents. The anti-cracking agent is obtained by reacting basalt fiber, terephthalic acid, 1, 4-butanediol, polyether glycol and a catalyst; and the water-retaining agent is obtained by mixing Hydropaat WE 3370 and welan gum. The self-leveling mortar prepared by using the technical scheme of the invention has good flowability, crack resistance and stability, and can be widely applied to pavement engineering with relatively high requirements on crack resistance.

The invention provides a step planing and milling device for pavement engineering and a planing and milling machine, belongs to the field of pavement planing and milling, and aims to solve the problems that a planing and milling machine cannot carry out side surface step planing and milling at a joint of a new road and an old road, so that the joint is poor in bonding quality and easy to damage. Comprising a mounting base, a transverse adjusting unit, a swinging execution unit, a lateral planing and milling head and a spraying unit, through cooperative cooperation of the transverse adjusting unit and the swing executing unit, the position and angle of the lateral milling head in the horizontal direction (transverse direction) and the vertical direction (depth) can be accurately controlled, so that the lateral milling head can stably and regularly mill a step structure on the side face of an old road, and the problems that a traditional milling machine can only mill a whole plane, and the milling efficiency is low are solved. And high-quality joint treatment cannot be completed under special working conditions such as half-range passing and connection of new and old roads.

The utility model relates to the technical field of pavement engineering construction, in particular to a pavement bearing structure laying device which comprises a forklift and a power assisting mechanism. In the power assisting mechanism, a base is detachably arranged on the forklift; the stand column is fixedly arranged on the base. The first rotating arm is rotationally arranged on the stand column. The lifting power piece is arranged on the first rotating arm, and the working end of the lifting power piece is connected with the main arm frame. One end of the main arm frame is hinged with one end, far away from the stand column, of the rotating arm I, and the other end of the main arm frame is connected with the telescopic rotating arm II; the second telescopic rotating arm is rotatably arranged relative to the main arm frame, and a telescopic joint is arranged on the second telescopic rotating arm; the rotating shaft is rotatably arranged at one end, far away from the main arm frame, of the telescopic rotating arm II; the suction cup assembly is arranged at the end, away from the second telescopic rotating arm, of the rotating shaft. The utility model can solve the problems that the existing mounting equipment does not have a transfer function, and the existing mounting equipment adopts a guide rail type moving structure, so that the adjustment flexibility is poor and the mounting precision is low.

The invention discloses a stress luminescence type chemical anchoring fog sealing layer material with blackening and wear-resisting functions and a construction method of the stress luminescence type chemical anchoring fog sealing layer material, and relates to the technical field of pavement engineering pre-maintenance. According to the fog seal material disclosed by the invention, near-neutral nonionic emulsified asphalt is taken as a stable reaction matrix, blackening and network enhancement of an asphalt pavement are realized by introducing activated latex slurry with high carbon black content, and interface bonding and mechanical-optical response triggered by a traffic load are realized by virtue of stress luminescent particles with a core-shell structure; and an interface chemical anchoring reaction is triggered during demulsification through the interface catalysis type anti-skid aggregate. All the components play a synergistic effect in the storage, construction and service stages, a reinforced seal coat with stress luminescence visual guidance, high blackness, high skid resistance and long-acting durability functions is finally formed on the pavement, and the reinforced seal coat is particularly suitable for improving the road traffic safety in dark light environments such as tunnels and road sections without street lamps.

The invention discloses a pavement engineering construction data processing and construction quality control method and system, and belongs to the technical field of pavement engineering construction. The method comprises the following steps: collecting multi-source construction data in real time through sensors arranged on materials, equipment and a site; predicting a future trend value of each quality influence factor by using a gray model; determining the comprehensive weight of each factor by adopting an analytic hierarchy process; the correlation degree between the factors is calculated through a grey correlation analysis method; constructing a multi-level grey comprehensive evaluation system based on the predicted value, the weight and the correlation degree; according to the prediction result, generating a plurality of construction parameter combination schemes in a preset step length to form a candidate scheme set; sorting the candidate schemes by adopting the comprehensive evaluation system, and selecting an optimal construction scheme; and finally, the parameters of the optimal scheme are issued to corresponding construction equipment through a control interface, the equipment operation parameters are dynamically adjusted, and real-time closed-loop control over the construction quality is achieved. According to the invention, accurate, dynamic and intelligent control of the construction process is realized.

The invention belongs to the technical field of airport pavement engineering material testing, particularly relates to an airport asphalt pavement cold patch material stability testing device and method based on an improved Hubbar-Field method, and aims to solve the problems that in the testing process, the size of a test piece is large, the test piece is often unstable and prone to collapse after being demolded, and consequently the testing result is inaccurate, and in addition, the test piece is prone to collapse. In the prior art, the initial stability, the plastic flowability and the maintenance period performance evolution of a cold-mixed repairing asphalt mixture are difficult to accurately reflect, and the requirements of high safety and rapid traffic opening of an airfield pavement repairing material in an actual use scene cannot be met, the following scheme is proposed, and the scheme comprises a bottom plate. The airport asphalt pavement cold patch material stability testing device and method based on the improved Hubbar-Field method disclosed by the invention have the beneficial effects that the problem that the cold patch material is easy to collapse during demolding is effectively solved, the reliability of test data and the applicability and accuracy of the test are improved, and a scientific basis is provided for material design and construction.

The application discloses a novel wear-resistant concrete for pavement engineering and a preparation method thereof. Ingredients include cement, water, sand, stone and iron powder. The iron powder is processed from discarded brake shoe friction parts. Each 100 parts of the mixture contains the following raw materials: 20.7-21 parts of cement, 23.8-27.6 parts of sand, 42.3-43 parts of stone and 2.8-4.4 parts of iron powder, and the rest is water. The incorporation of the iron powder can form a transition buffer zone between the cement paste and the aggregate contact surface, slow down the segregation between the aggregate and the cement mortar, improve the interface bonding strength between the aggregate and the mortar, reduce the concrete defects, thereby improving the concrete strength and wear resistance. Moreover, the used iron powder is processed from discarded brake shoe friction parts, and has strong environmental protection and economic values.

The application discloses a paving device for expressway construction and belongs to the technical field of pavement engineering machinery, which comprises a suspension frame, a material distributing assembly, a rammer driving assembly and a paving vehicle, the suspension frame is arranged at the rear side of the paving vehicle, the material distributing assembly is arranged between the paving vehicle and the suspension frame, and the rammer driving assembly is arranged in the suspension frame. The hydraulic device on the suspension frame pushes the lengthened box to stretch out or retract along the hanging plate sliding groove, so that the paving width can be continuously adjusted, and the shutdown and disassembly process is eliminated; the driving motor of the material distributing assembly is connected with the main material distributing auger and the auxiliary material distributing auger through a polygonal transmission shaft, the gear bearing slides in the chain box to maintain the continuous rotation of the auxiliary material distributing auger, and material accumulation and segregation are avoided; the rammer motor of the rammer driving assembly drives the main rammer plate and the auxiliary rammer plate to be synchronously rammed through a polygonal transmission short shaft, the overlapping ramming of the joint areas is improved, the compactness is improved, and the longitudinal weak joint belt is eliminated by overlapping ironing through the ironing device.

The utility model discloses an integrated wireless slab staggering measuring device which is used for detecting slab staggering phenomena in engineering structures such as roads, bridges and concrete pavements. The device adopts an integrated structure, and the battery is wirelessly integrated in the device, so that the self-sufficiency power supply capability of the device is ensured, the instant remote transmission of data is realized, and the portability and the operation flexibility of the device are remarkably enhanced. And meanwhile, through the high-precision encoder, the physical displacement of the staggered slab is accurately converted into a stable electric signal to be output, so that the measurement precision and stability are improved, and errors possibly generated in a traditional measurement mode are effectively avoided. Besides, the device also has a real-time monitoring function of slab staggering height change, can quickly capture and feed back related data, and provides technical support for timely processing and effective maintenance of slab staggering, so that the safety of an engineering structure is enhanced, and the overall efficiency of maintenance operation is improved.

The invention relates to the technical field of tunnel pavement detection, and discloses concrete detection sampling equipment for tunnel pavement engineering and a sampling method.The concrete detection sampling equipment comprises a detection drill bit and a clamping and cooling mechanism. Therefore, according to the detected state of the concrete core, the rotating speed and the drilling speed of the detection drill bit are accurately controlled, and the fractured concrete core is limited and protected when the concrete core is fractured, so that the fractured concrete core is prevented from inclining, abutting against the inner wall of the detection drill bit and rotating along with the detection drill bit. According to the concrete core detection device, the height of the concrete core and the structural layer of the concrete core are prevented from being affected by mutual friction of fractured parts of the concrete core, so that measurement is not accurate enough, the stability of the detection drill bit during drilling can be improved through the arranged clamping and cooling mechanism, and the detection accuracy of the vibration sensor is indirectly improved; and meanwhile, the detection drill bit can be cooled.

The invention discloses an SBS modified asphalt mixture and a preparation method thereof. The mixture is prepared by mixing a composite aggregate system and SBS modified asphalt according to an asphalt-aggregate ratio of 4.5-5.5%, the SBS modified asphalt is prepared by swelling base asphalt, 4 to 5 weight percent of linear SBS, 0.3 to 0.4 weight percent of BPO, 0.2 to 0.3 weight percent of BPA and 2 weight percent of environment-friendly aromatic oil at the temperature of 45 DEG C for 150 minutes. The problems that existing SBS modified asphalt is slow in swelling, weak in interface adhesion and poor in skeleton stability are solved, the swelling efficiency is improved by 40%, the interface adhesion work reaches 305 mJ / m < 2 > or above, the anti-rutting coefficient is improved by 50%, and the SBS modified asphalt is suitable for high-grade highway pavement engineering.