459 results about "Base course" patented technology

The invention discloses a polymer emulsion composite modified road base material and a preparation method thereof, and belongs to the technical field of traffic infrastructure engineering materials. The polymer emulsion composite modified road base material is prepared from the following raw materials: graded aggregate, super sulfate cement or geopolymer cement, water for mixing, vinyl acetate-ethylene (VAE) copolymer emulsion and a silane coupling agent. The preparation method comprises the following steps: mixing the VAE emulsion with water for mixing to obtain a polymer diluent; mixing graded aggregate with an inorganic cementing material, then adding the polymer diluent, and mixing to obtain a mixture; and then paving, compacting, forming and curing are carried out. By forming a VAE flexible network-C-S-H / ettringite hybrid network, the material has the remarkable advantages of higher mechanical strength and low cost, and can greatly improve and enhance the crack resistance and durability of the road base.

The invention discloses a geogrid and EICP synergistically reinforced soil embankment structure and a construction method, and relates to the technical field of soil embankment structures. Comprising a pavement base layer, an embankment bearing layer and a natural soil foundation layer, and the natural soil foundation layer is used as a soil embankment structure support and is arranged at the bottommost layer; the pavement base layer is used for bearing an upper driving load and uniformly transferring the upper driving load to the embankment bearing layer below; and the embankment bearing layer is used for bearing the upper load transmitted by the pavement base layer. The engineering performance is improved through the multi-layer synergistic effect, the core reinforcing layer is of an innovative space grid structure and is composed of a prefabricated geogrid, a grid support arranged in the inclined direction and a rigid stress plate frame, a three-dimensional force transmission network is formed, the limitation of a traditional reinforcing method is broken through, and the engineering performance is improved. In addition, the grating support is arranged at a specific angle, the structural rigidity is guaranteed, and the stress concentration phenomenon is avoided.

The invention discloses an expressway pit pond early warning method and system based on time sequence feature fusion, and relates to the technical field of intelligent traffic monitoring and road maintenance. The method comprises the following steps: S1, collecting multispectral image information of a road surface, synchronously obtaining external information, and respectively generating multispectral and external data sets; s2, correcting and fusing the multispectral data, extracting multidimensional features, and constructing a time sequence optimization feature vector in combination with external data; s3, inverting states of a bonding layer, a base layer and a surface layer in the pavement according to a mapping relation between spectral characteristics and structure parameters, and generating an implicit structure health index; s4, taking the time sequence optimization feature vector, the implicit structure health index and the external data set as input, and utilizing an LSTM model to predict a pit-pond formation probability and a development trend; and S5, calculating a dynamic risk level according to a prediction result. Through fusion analysis of multispectral time sequence characteristics and structural health states, full-period early warning from early damage to forming damage of a pit and a pond is realized, and support is provided for accurate maintenance.

This invention relates to a pavement structure and its installation method. The pavement structure includes a main body, which comprises a base layer, a concrete layer, and a first bonding layer. The first bonding layer is disposed between the base layer and the concrete layer to bond the base layer and the concrete layer. A storage tank is fixedly disposed on the side of the main body. The storage tank is used to store an aqueous solution of light stabilizer, and the top of the storage tank is provided with a feeding port, in which a plug is detachably installed. The main body also includes a hydrophilic polymer fiber mesh, which is laid on the concrete layer and extends into the storage tank from the side. The polymer fiber mesh can adsorb and disperse the aqueous solution of light stabilizer on it. The surface tension of the fibers promotes the flow of liquid, and the aqueous solution of light stabilizer in the storage tank is uniformly absorbed and dispersed throughout the pavement structure, extending the UV resistance of the pavement structure and ensuring the full service life performance of the concrete.

The application discloses a method for determining the optimal spraying time of a road penetration layer and a sealing layer, comprising the following steps: preparing semi-rigid base mixture according to design requirements and laying the semi-rigid base; preparing penetration layer material and sealing layer material according to design requirements respectively and laying the penetration layer and the sealing layer; preparing asphalt sub-base mixture according to design requirements and laying the asphalt sub-base; preparing shear test pieces on the semi-rigid base asphalt pavement formed by spraying the penetration layer and the sealing layer with different spraying time combinations, and performing shear tests respectively, and performing multi-stage verification on the shear test results, so as to determine the optimal spraying time combination of the road penetration layer and the sealing layer. The application can accurately determine the optimal spraying time combination of the penetration layer and the sealing layer, improve construction efficiency and reduce maintenance cost. The determined spraying time combination of the penetration layer and the sealing layer will not cause the semi-rigid base to crack, the interlayer adhesion between the semi-rigid base and the asphalt sub-base is firm enough, and the service life of the road is improved.

The application provides a quick-setting anti-freezing geopolymer pavement base material and a preparation method thereof, and belongs to the technical field of geopolymer materials. The application takes red mud and titanium white slag as precursor materials, takes carbide slag as an alkali activator, and simultaneously adds anti-freezing reinforcing materials compounded by white mud, ceramic powder and brick powder. The geopolymer pavement base material is formed by compounding multiple components, fully utilizes multiple high-alkaline and silicon-aluminum-rich solid waste resources, has the comprehensive advantages of low carbon, environmental protection, low cost, short construction period, excellent anti-freezing performance and the like, breaks through the technical bottlenecks of slow low-temperature setting and poor durability of the pavement base material in cold regions, and is suitable for highway, municipal road and border road engineering in high-cold regions. The application has important engineering significance and popularization value for green traffic infrastructure construction in cold regions.

This utility model discloses a side-limiting device for cement-stabilized crushed stone base course of highways, belonging to the field of highway technology. It includes a pusher plate with a first connecting frame fixed on one side and a second connecting frame fixed on the other side. Limiting side baffles are provided on both sides of the pusher plate. This utility model includes an adjustment component, which allows an electric telescopic rod to move the limiting side baffles via the connecting plates, automatically adjusting the position of the limiting side baffles to adjust the limiting position of the crushed stone base course. Operation is convenient, and the rear baffle can cover the gap between the limiting side baffles and the pusher plate, preventing it from affecting the limiting effect. This utility model also includes a stabilizing component, where the lower end of the limiting side baffle is rotatably connected to a support roller via a positioning shaft. This supports the limiting side baffle, making its movement more stable, and reduces friction during rotation, preventing wear on the limiting side baffles.

The utility model discloses an asphalt pavement self-drainage structure, which particularly relates to the technical field of road engineering, and comprises a foundation layer, a broken brick layer and a cement layer which are sequentially arranged on the foundation layer, a rubble layer paved above the cement layer and an asphalt layer paved above the rubble layer, the rubble layer extends out of two sides of the asphalt layer, the broken brick layer and the cement layer, and main drainage grooves are formed in the two sides of the gravel layer correspondingly. According to the asphalt pavement self-drainage structure provided by the utility model, the gravel layer and the asphalt layer are paved on the original cement layer, so that rainwater partially permeates when falling onto the asphalt layer, and is drained towards two sides along the cement layer through the permeation of the gravel layer; rainwater on the upper portion of the asphalt layer is discharged towards the two sides of the asphalt layer and flows into the main drainage groove through the gravel layers on the two sides of the asphalt layer to be collected and discharged, then the rainwater is guided to flow into the main drainage groove to be collected under the condition that an original cement layer is not damaged, and the rainwater discharging effect is improved.

This invention provides a perimeter structure and construction method for road manhole covers. The perimeter structure includes a base reinforcement section, formed by pouring a first layer of concrete into the excavated surface of the roadbed, with multiple layers of steel mesh installed within the base reinforcement section; a permeable load-bearing section, formed by pouring permeable concrete above the base reinforcement section, with a drainage channel; a drainage pipe connected to the drainage channel, used for connecting to a drainage system; and an anchor, the lower end of which is connected to the multiple layers of steel mesh, and the upper end passing through the permeable load-bearing section and connecting to the manhole ring, used for installing the manhole cover. This invention provides a construction method for the perimeter structure of road manhole covers, constructing multiple layers of steel mesh, anchors, and drainage pipes in the excavated surface of the roadbed, and forming a composite load-bearing structure through pouring, used for installing the manhole ring and manhole cover. The beneficial effects of this invention are: reducing the risk of manhole ring settlement, increasing the drainage speed of water accumulation around the manhole, and reducing rainwater erosion of the roadbed.

The utility model relates to the technical field of municipal engineering, in particular to a roadbed for municipal road engineering, which adopts the technical scheme that the roadbed comprises an original foundation and a substrate layer, earthwork is excavated on the top surface of the original foundation, the substrate layer is paved on the top surface of the excavated original foundation, and a roadbed layer is paved on the top surface of the substrate layer. A base layer is laid on the top face of the roadbed layer, a surface layer is laid on the top face of the base layer, a plurality of stand columns are arranged and installed on the surface of the original foundation, the lower ends of the stand columns are inserted into the deep position of the original foundation, fixing rods are inserted into the upper ends of the stand columns, and geogrids are fixedly installed between the fixing rods at the upper ends of the stand columns. The roadbed structure has the beneficial effects that the overall tensile strength and shear strength of the roadbed are enhanced through the geogrids which are vertically arranged in each layer of the roadbed, so that the effect of reducing hollowing in the roadbed is achieved, the problems of cracks, cracks or local collapse and the like on the pavement are further avoided, the service life of the pavement is prolonged, and the safety of the pavement is improved.

This application relates to the field of mixing equipment technology and discloses a filler mixing device for treating cracks in the water-stabilized base course of high-fill and deep-cut road sections. The device includes a tank with an opening at the bottom and a telescopic cylinder fixedly connected to the lower surface of the tank. A base plate is fixedly connected to the bottom of the telescopic cylinder. A conveying channel is fixedly and continuously connected to the bottom of the tank, and a discharge pipe is fixedly and continuously connected to the base plate. A telescopic component is provided between the tank and the base plate. A mixing mechanism is installed inside the tank. The telescopic component includes an electric push rod. This invention, by using the telescopic component, base plate, and telescopic cylinder in conjunction, allows the base plate and telescopic cylinder to form a new storage space. When filler material is added into the storage space through the conveying channel, since both the storage space and the conveying channel are located below the mixing mechanism, the addition of filler material will not impact the mixing mechanism, thus avoiding damage to the mixing mechanism.

The utility model belongs to the field of construction sites, and particularly relates to a waterproof roll paving device which comprises a cart, a supporting frame is upwards arranged on the front portion of a bottom frame of the cart, a hopper is arranged on the supporting frame, a discharging opening is formed in the bottom face of the hopper, a rotating rod is arranged at the position of the discharging opening, one end of the rotating rod penetrates through the hopper to be connected with a motor, and the motor is fixed to the bottom frame. A supporting rod is arranged on the bottom frame, a waterproof roll cylinder is sleeved on the supporting rod, and a compression roller is backwards hinged to the tail part of the bottom frame. According to the device, the waterproof roll can be laid while the slurry is sprayed, the construction efficiency is improved, the rotating rod is arranged at the discharging opening of the hopper, uneven discharging is prevented, meanwhile, the slurry is prevented from being accumulated at the discharging opening, the bonding slurry can be evenly sprayed to a base layer, and the construction quality of the waterproof roll is guaranteed.

The application discloses a kind of piece block stone roadbed porosity identification method, device, equipment and storage medium, it is related to highway detection technical field.The method comprises: obtaining the initial structure data of the road to be processed;The initial structure data includes surface layer initial data, base layer initial data, gravel layer initial data and piece block stone layer initial data;Based on a plurality of preset porosities and the initial structure data, the roadbed structure simulation model corresponding to each preset porosity is constructed;The simulation piece block stone layer field intensity and preset porosity of each roadbed structure simulation model are fitted to obtain a fitting formula;Obtain the actual detection data of the road to be processed;Based on the actual detection data, obtain the measured piece block stone layer field intensity;Based on the measured piece block stone layer field intensity, the fitting formula is used to obtain the porosity of the piece block stone layer.

The invention relates to the technical field of pavement structures, in particular to a high-bearing-capacity permeable pavement structure based on ecological concrete.The high-bearing-capacity permeable pavement structure comprises a surface ecological permeable concrete layer, a high-bearing-capacity supporting framework layer and a stable base layer, a mounting groove is formed in one side of the top end face of the surface ecological permeable concrete layer, and a first connecting hole is formed in the side wall of the mounting groove through a drainage hole; a mounting hole is formed in one side of the top end face of the surface ecological water-permeable concrete layer, and the lower side of the mounting hole communicates with a second connecting hole. According to the ecological water-permeable system, the surface ecological water-permeable concrete layer, the high-bearing supporting framework layer and the multi-stage filtering drainage structure are introduced into a traditional water-permeable system, and cooperative improvement of the bearing performance and the water-permeable performance is achieved; according to the structure, high strength and stability are guaranteed, meanwhile, rainwater is purified step by step through the coarse filter layer, the medium filter layer, the fine filter layer and filter cotton arranged in the filter box, pores are effectively prevented from being blocked, and long-term water permeability is maintained.

The present application relates to the technical field of road maintenance, and particularly relates to an asphalt pavement base crack identification method and system, which comprises: acquiring an asphalt pavement base image and preprocessing the image to obtain a gray image, then performing edge detection on the gray image by using a Canny operator to obtain all edge connected domains, calculating the corresponding crack similarity based on the contour shape features of each edge connected domain, screening out suspected crack edges and non-crack edges according to the crack similarity, then extracting the HOG feature values of each edge point in the two types of edges and calculating the crack confidence value of the suspected crack edges, determining the suspected crack edges with the crack confidence value greater than a preset threshold as target crack edges, and finally completing crack positioning in the asphalt pavement base image according to the target crack edges to realize accurate identification of the asphalt pavement base cracks. The present application effectively eliminates the noise interference of material particle edges in the asphalt pavement image through the double technical mechanisms of coarse screening of crack similarity and fine screening of crack cluster degree.

The utility model relates to a tunnel noise-reducing and flame-retardant pavement structure, which aims to solve the problems of high noise and poor flame-retardant property of the conventional tunnel pavement. The tunnel noise-reduction and flame-retardant pavement structure sequentially comprises an upper surface layer, a middle surface layer, a lower surface layer, a base layer, a subbase layer, a stress absorption layer and a tunnel inverted arch from top to bottom, thermal spraying type modified asphalt is adopted between the upper surface layer and the middle surface layer to serve as a first bonding layer, and thermal spraying type modified asphalt is adopted between the middle surface layer and the lower surface layer to serve as a second bonding layer. A broken stone sealing layer is adopted between the lower surface layer and the base layer as a third bonding layer; wherein the upper surface layer is made of a macroporous asphalt mixture doped with a flame retardant, the middle surface layer is made of an asphalt mixture of SBS modified asphalt, and the lower surface layer is made of a rubber asphalt mixture. According to the tunnel noise-reducing and flame-retardant pavement structure, the fire retardant is doped in the surface layer, the ignition point of the pavement is improved, and the pavement surface layer adopts the macroporous asphalt mixture, so that the driving noise of the pavement is reduced, and the influence on driving and pedestrians is reduced.

The utility model discloses a kind of road and bridge construction joint filling machine, relate to road and bridge construction technical field.The road and bridge construction joint filling machine, including bottom plate and angle adjusting mechanism, the top of bottom plate is fixedly installed with two groups of fixed plate, the top of bottom plate is provided with intercommunication shell, the bottom of intercommunication shell is fixedly installed with multiple groups of air outlet spray head and is interconnected with it, the top of bottom plate is fixedly installed with push handle, the bottom of bottom plate is provided with four groups of pulley;Angle adjusting mechanism is arranged on fixed plate, and angle adjusting mechanism is used to adjust the spray angle of air outlet spray head.By the cooperation of fixed rod one, hydraulic rod, fixed rod two, rotating short stick, connecting truss, intercommunication shell and air outlet spray head, angle adjusting mechanism can drive intercommunication shell to carry out angle adjustment, so that intercommunication shell can be swept to different depth crack, avoid impurity mixing in new joint filling material, affect its adhesion and solidification effect, improve the adhesion of sealing material and base layer, improve joint filling quality.

The application relates to the technical field of municipal construction, and discloses a sponge type road paving structure which comprises a water permeable layer, a filter layer arranged below the water permeable layer, a drainage layer arranged below the filter layer, a base layer arranged below the drainage layer, a water storage groove arranged on the base layer, a pipeline arranged in the water storage groove, an arched pressure bearing plate arranged on the base layer, the pressure bearing plate being arranged above the water storage groove, the pressure bearing plate being in contact with the drainage layer, a support structure arranged on the bottom wall of the water storage groove and used for supporting the pressure bearing plate, and a drainage pipe arranged in the water storage groove, so that the service life of the road is prolonged.

The present application relates to the technical field of bulk solid waste and road, and provides a pouring type phosphogypsum road stable base mixture, a preparation method, a construction method and application thereof, wherein the high-temperature modified phosphogypsum with specific properties is used as a cementing material, and is mixed with water, an additive and the like in a large amount to form a mixture, the mixture can realize a paving and pouring type process, reduces construction operation and mechanical cost, in addition, for the area that cannot be directly operated by a road roller in the construction of a traditional road stable base, the quality defects of the area that cannot be compacted in the dead angle area or the edge area are avoided, and the obtained base structure is free of curing, can be quickly solidified, has high early strength and good quality.

The application is a kind of connecting structure of existing river-crossing bridge and newly-built dike and its construction method, which comprises an existing road, a connecting structure section and an existing river-crossing bridge; the connecting structure section comprises a sand-gravel roadbed layer, a graded broken stone base layer laid on the sand-gravel roadbed layer and a cement concrete pavement layer cast on the graded broken stone base layer; the cement concrete pavement layer is composed of a rising slope section, a straight section and a descending slope section, the rising slope section is connected with the existing river-crossing bridge at its starting point and the descending slope section is connected with the existing road at its ending point; retaining walls are arranged on both sides of the connecting structure section. Compared with the prior art, the application avoids removing and rebuilding the existing river-crossing bridge for water blocking, reduces the engineering investment, saves the investment by using the sand-gravel material excavated from the river for filling the roadbed layer, has simple structure, is convenient for construction, is easy to obtain materials and has low cost, and meets the road traffic requirements.

The utility model provides a paver for large-thickness one-time whole-width paving of a water-stable base layer, which comprises a vehicle body, a hopper mechanism and a first hydraulic cylinder, the vehicle body is provided with a paver and a conveying seat, the conveying seat is provided with a leakage groove, a conveying device is arranged below the leakage groove, the hopper mechanism comprises two material receiving plates and a first hydraulic cylinder, the two material receiving plates are rotatably arranged on two sides of the top of the conveying seat, and the first hydraulic cylinder is arranged on the top of the conveying seat. The two first hydraulic cylinders are rotationally installed on the two sides of the conveying base, and the telescopic shaft ends of the first hydraulic cylinders are rotationally connected with the bottom sides of the corresponding material receiving plates. The supplementing and conveying mechanism comprises a pushing plate and second hydraulic cylinders, the two second hydraulic cylinders are installed on the two sides of the conveying base, the telescopic shaft ends of the second hydraulic cylinders face the rear side of the vehicle body and are provided with connecting blocks, the pushing plate is located at the rear end of the top of the conveying base and connected with the two connecting blocks, and the second hydraulic cylinders can drive the pushing plate to move into or out of the upper sides of the two material receiving plates. Most residual materials can be poured into the leakage groove, manual material shoveling is replaced, and the construction efficiency can be improved.

The application belongs to the technical field of road engineering construction, and particularly relates to a high-performance anti-rutting pavement base. The base body of the pavement base comprises an upper base body and a lower base body; the material of the upper base body is sand-free large-pore cement concrete, and the material of the lower base body is open-graded large-diameter asphalt mixture; a high-viscosity modified emulsified asphalt-based grouting material is grouted on the base body, thereby forming the high-performance anti-rutting pavement base. The high-performance anti-rutting pavement base has flexibility and rigidity, solves the problem of easy cracking of conventional semi-flexible pavement, effectively avoids diseases such as cracks in the pavement in a short period of time, and greatly prolongs the service life of the pavement.

This invention belongs to the field of industrial solid waste resource utilization technology, and relates to a circulating fluidized bed ash-based cementitious material for road base courses and its preparation method. The raw materials for the road base course cementitious material are composed of the following mass parts: 29-43 parts of circulating fluidized bed ash, 16-27 parts of ground blast furnace slag, 3-6 parts of silica fume, 7-15 parts of P.O42.5 silicate cement, 0.1-0.4 parts of activator, and 27-30 parts of water. The circulating fluidized bed ash is prepared by mixing circulating fluidized bed fly ash and slag in a mass ratio of (2-5):(5-10). This invention effectively alleviates the problems of fast setting time and shrinkage cracking of traditional road base course cementitious materials by utilizing the characteristics of micro-expansion and long hydration time of circulating fluidized bed ash. The advantage of this invention is that it promotes the large-scale utilization of circulating fluidized bed ash and contributes to carbon emission reduction in the road sector.

The utility model discloses a semi-flexible composite pavement structure, and relates to the technical field of road engineering, the semi-flexible composite pavement structure comprises a rigid base layer, a transition layer, a flexible surface layer and a pavement coating, and embedded parts are arranged in the rigid base layer, the transition layer and the flexible surface layer; three layers of materials are stacked and combined, embedded parts are arranged inside, a stable mechanical meshing structure which is narrow in top and wide in bottom can be formed, reflection cracks and interlayer stripping can be effectively restrained, a pavement coating sealing layer is finally coated, the service life of a pavement is remarkably prolonged, the driving comfort is remarkably improved, meanwhile, the maintenance cost is reduced, and the service life of the pavement is prolonged. The long-acting stable pavement performance combining rigidity and softness is realized.

The present application relates to the technical field of road engineering, and particularly relates to a bridge-head cover plate combined fiber anti-cracking flexible splicing structure and a preparation method thereof, which comprises a base layer with an asphalt pavement part on the top and an abutment; the base layer, the abutment and the asphalt pavement part form a groove, the side wall of the groove is formed by the asphalt pavement part, the bottom wall of the groove is formed by the base layer and the abutment; the inner wall of the groove is coated with a two-component high-viscosity high-elasticity interface adhesive; from bottom to top, the groove is sequentially filled with a high polymer elastic body and a reinforced anti-cracking asphalt mixture; a basalt fiber bar anchoring member is pre-buried in the inner wall of the groove, and the high polymer elastic body and the reinforced anti-cracking asphalt mixture wrap the basalt fiber bar anchoring member; through the stress diffusion of the interface adhesive layer, the deformation buffer of the flexible bottom layer and the anti-cracking cooperation of the rigid surface layer, the road surface longitudinal slope mutation caused by the differential settlement of the abutment and the base layer is effectively relieved, the vehicle jumping impact force is reduced, the road surface longitudinal corner is reduced, and the driving smoothness and the structural durability are significantly improved.

The application discloses a cement pavement repairing structure combination design optimization method, relates to the technical field of highway engineering concrete pavement damage maintenance and repair, and is characterized in that: the convex pit groove repairing structure is arranged, on the basis of improving the interlayer contact state of the area outside the joint of the new and old concrete panels, under the coupling effect of heavy load and environment, the stress characteristics of the joint area of the new and old panels of the cement pavement are effectively improved, when cracks are generated at the surface layer or the joint, the waterproof film layer in the composite isolation layer prevents water from flowing into the base layer, prevents the pumping and mud pumping phenomenon of the pavement panel under the action of the driving load, meanwhile, the composite isolation layer form is arranged between the surface layer and the base layer, the interlayer contact state of the surface layer and the semi-rigid or rigid base layer is improved, the surface layer and the base layer are vertically and continuously and smoothly contacted, and when the concrete panel bears the load, the overall stress uniformly disperses the external load to the base layer.

The utility model provides a device for detecting the shear strength of a flexible base pavement, belongs to the technical field of detection devices, mainly aims at solving the problems that the existing detection device is poor in fixing effect on a to-be-detected piece by a test piece and a fracture surface is inconvenient to observe, and adopts the following technical scheme that the device comprises a base, a mounting table and a protective cover, a hydraulic ejector rod is arranged at the top of the mounting table; a pushing plate is arranged at one end of the hydraulic ejector rod; a first pavement layer is arranged in the protective cover; a second pavement layer is arranged at the top of the first pavement layer; a second fixing plate is arranged at one end of the first road surface layer, magnifying lenses are arranged on the two sides of the protective cover, the fixing effect on the to-be-detected piece is improved through cooperation of the first fixing plate and the pushing plate, the magnifying lenses can be moved through arrangement of the magnifying lenses and the sliding grooves, and the fracture surface of the to-be-detected piece can be observed conveniently.

The application provides a highway pavement maintenance method, and belongs to the technical field of highway maintenance, which comprises the following steps: using a first graphic mark at a damaged position of a highway pavement, digging downward according to the first graphic to form a reinforced foundation pit; using a second graphic to cover the first graphic on the highway pavement, performing surface damage treatment on the highway pavement in the second graphic to form a ring-shaped reinforcing connection layer; arranging a first support and a second support in the reinforced foundation pit; filling base material into the reinforced foundation pit to form a new base layer; installing a ring-shaped reinforcing structure on the reinforcing connection layer, and the center position of the reinforcing structure is recessed downward to form a reinforcing connection part, which enters the reinforced foundation pit and is located above the new base layer. The highway pavement maintenance method provided by the application greatly improves the bearing capacity and strength of the repaired damaged position, and the repaired surface layer is not prone to secondary cracking, thereby ensuring long-term effectiveness of highway maintenance work.

The utility model relates to the technical field of stirring devices, and discloses a stirring device for a high-strength phosphogypsum slag composite road base cementing material, which comprises a stirring device body, a mounting column is mounted at the bottom end in the stirring device body, a rotating column is rotatably connected in the mounting column, a stirring rod is arranged in the rotating column, and a stirring rod is arranged in the stirring rod. Adjusting grooves are formed in the two sides of the rotating column correspondingly, and push blocks are slidably connected into the adjusting grooves. According to the stirring device for the high-strength ardealite slag composite road base cementing material, a worker aligns the bottom of a stirring rod to the interior of a rotating column and inserts the stirring rod into the rotating column, and after insertion, the worker rotates the rotating column, so that the rotating column drives a pushing block and an inserting rod to synchronously move, and the pushing block is in contact with an arc block; when the push block is in contact with the thicker end of the arc block, the arc block pushes the push block to drive the insertion rod to be inserted into the insertion hole to fix the stirring rod, so that the applicability of the equipment is improved.

This utility model discloses a limiting manhole ring for anti-settlement manhole covers, including a base layer, a ground layer, and a limiting mechanism. The ground layer is laid on top of the base layer, and the limiting mechanism is set inside the base layer and the ground layer. The limiting mechanism includes a well hole, an insertion hole, a support ring, a reinforcing bar, a concrete manhole ring, and a ring-shaped reinforcing bar. The well hole is opened inside the base layer, and the top of the well hole penetrates the ground layer. The insertion hole is opened vertically on the outer periphery of the well hole inside the ground layer, and the bottom of the insertion hole extends into the base layer. When the manhole ring and the manhole cover are under pressure, the pressure at the pressure point can be dispersed and transmitted to the interior of the base layer because the position of the support ring is fixed. At the same time, because the reinforcing bar is embedded in the concrete, its position is fixed, and the support ring will not tilt or settle, thereby improving the stability of the concrete manhole ring. It can still avoid settlement problems after long-term pressure and maintain the smoothness of the road surface.