7148results about "Building repairs" patented technology

A digital auxiliary repair method for an ancient building. The method comprises: point cloud data acquisition, point cloud model establishment, point cloud model optimization and model printing, which involve: scanning and photographing a damaged ancient building by using a three-dimensional scanner and an industrial camera, so as to obtain three-dimensional point cloud data of the ancient building; performing preprocessing, such as data registration, data denoising, data simplification and data segmentation, on the point cloud data to obtain data for establishing a three-dimensional model; optimizing the three-dimensional model; and by means of a 3D printer, obtaining a mold for a damage position of the ancient building, and on the basis of requirements, using the mold to perform molding to obtain a wooden or brick-mixed workpiece.

The invention discloses a multi-element historic building maintenance and restoration method based on three-dimensional laser scanning, and relates to the technical field of computer processing, and the method comprises the following steps: S01, obtaining the three-dimensional point cloud data of a historic building foundation through a ground laser scanner, the basic three-dimensional point cloud data comprises geometric information of a building facade, a ground structure and a near-ground decoration component; s02, an unmanned aerial vehicle carries a multi-line laser scanning device to scan the top and the high-altitude structure of the building, supplementary point cloud data is generated, and the millimeter-level precision three-dimensional coordinates of the pitched roof, the tower eave and the cornice bracket are covered with the supplementary point cloud data; and S03, synchronously acquiring surface texture data of the historic building by adopting multispectral imaging equipment. According to the method, the millimeter-level precision of three-dimensional reconstruction of the historic building is realized through multi-source data fusion and a hierarchical optimization algorithm, and the maintenance decision efficiency is improved by combining automatic disease recognition and a multi-modal analysis technology.

The invention provides a house waterproof maintenance system based on an intelligent detection and self-repairing technology, and the system comprises an intelligent sensing layer which is used for collecting multi-dimensional physical parameters of building waterproof key nodes in real time; the edge calculation analysis layer is used for performing fusion analysis and risk prediction on the perception data; the dynamic self-repairing execution layer is used for triggering a multi-stage repairing mechanism according to an analysis result; the cloud management layer is used for realizing visual management and control and strategy optimization of the whole system, and relates to the technical field of building waterproofing, the building state is monitored in real time through a multi-mode sensing network, water leakage risk prediction is realized in combination with an edge calculation algorithm, and collaborative repair of a microcapsule repair agent, a shape memory alloy grid and an electrodialysis module is triggered; the system remarkably improves the timeliness and reliability of waterproof maintenance, reduces the manual intervention cost, and is suitable for intelligent maintenance of residential buildings, industrial buildings and historical protection buildings.

The invention relates to the field of constructional engineering concrete detection, in particular to a reamer bit and a concrete repairing method.The reamer bit comprises a mounting base, at least two drill arms and at least two supporting rods; one end of the drill arm is hinged with the mounting seat, a fixing pipe is arranged between the hinge points of the drill arm and the mounting seat, the fixing pipe is connected with a positioning rod in a sliding manner, one end of the supporting rod is hinged with the positioning rod, and the other end of the supporting rod is hinged with the drill arm. When the reamer bit is used, the angle of the drill arm can be flexibly adjusted by pressing the positioning rod, the hole diameter of a reaming hole can be accurately controlled according to actual repairing requirements, and the reamer bit is suitable for repairing scenes of coring holes of different sizes and depths; the formed horn mouth with the wide inside and the narrow outside can be embedded into original concrete like a tenon after concrete is poured, the combining capacity of new concrete and old concrete is greatly improved, and it is guaranteed that a repaired area is not prone to separation.

The invention discloses an old wind power plant fan foundation small-to-large capacity increasing structure and a transformation construction method. The old wind power plant fan foundation small-to-large capacity increasing structure comprises an original fan foundation, a newly-poured reinforced concrete foundation, a vertical anchor bolt cage connecting system and a radial anchor bolt connecting system. The connecting structure of the bottom section of the new fan tower drum and the new fan foundation comprises a vertical anchor bolt cage connecting system and a radial anchor bolt connecting system. The vertical anchor bolt cage connecting system is fixed in the original fan foundation, and the radial anchor bolt connecting system is fixed in the newly-poured reinforced concrete foundation. According to the new fan foundation, the diameter of the middle pier is expanded so as to arrange a new tower tube, the height of the middle pier is not changed, the height of the middle pier of the newly-poured foundation almost does not need to be increased, and the using amount of concrete is greatly reduced. Meanwhile, according to the structure, an original vertical anchor bolt cage connecting system is reserved, a radial anchor bolt connecting system is adopted for enhancing connection between the bottom section of the fresh air fan tower barrel and the fan foundation, the transformation cost and the connection reliability are effectively controlled, and the maximization of reutilization of the original fan foundation and the controllability of the cost of the fresh air fan foundation are achieved.

The invention relates to the technical field of concrete structure repairing, in particular to a repairing system of a reinforced concrete column based on triple cooperative constraint, which comprises a core area concrete column formed by removing a failed concrete protection layer from a rusted reinforced concrete column; the longitudinal bars are arranged on the peripheral side of the core area concrete column; the four-corner star-shaped stirrups are hooped on the outer side of the core area concrete column at intervals in the axial direction of the core area concrete column and are fixed to the longitudinal bars; the anti-stress pieces are arranged at the four corners of the core area concrete column and fixedly connected with the four corner ends of the four-corner star-shaped stirrups; and the FRP grid-ECC composite sandwich structure is arranged on the outer side of the core area concrete column. According to the method, through a material performance complementation and interface stress coordination mechanism, the purpose of multi-target collaborative optimization of axial compression-bending shear coupling bearing capacity reconstruction, interface durability improvement, secondary corrosion inhibition and the like of the repaired concrete column is achieved. The invention further correspondingly discloses a construction method of the repairing system.

The invention relates to the technical field of biomineralization, and particularly discloses an alkali-resistant urease-producing microbial flora for biomineralization of construction joints and a preparation method of the alkali-resistant urease-producing microbial flora. The microbial flora disclosed by the invention is prepared from the following strains with relative abundance: 4.4 to 5.2 percent of bacillus, 0.39 to 0.46 percent of enterococcus, 4.8 to 5.7 percent of alcaligenes, 0.50 to 0.58 percent of cellulomonas, 22.4 to 24.2 percent of lysobacter, 1.7 to 2.4 percent of pseudomonas, 10.8 to 11.9 percent of Savagea, 15.1 to 16.2 percent of sarcina, 30.8 to 32.2 percent of chloridomonas and 0.41 to 0.48 percent of bacillus. The alkali-resistant microbial compound flora with high urease activity in the limited oxygen and normal environment can effectively overcome the defects that urease microorganisms are low in mineralization efficiency under the anoxic condition, and the strength of an obtained consolidated body is not high.

The invention discloses a farm wall reinforcing device. Farm wall reinforcing equipment comprises an adjusting sliding frame, an even number of reinforcing devices are installed on the adjusting sliding frame, protective cover baffles are installed on the surfaces of the reinforcing devices, pouring mold clamping plates are arranged in the reinforcing devices, inner grooves are formed in the upper portions of the pouring mold clamping plates, and an even number of steel bar fixing frames are arranged between the inner grooves. A turnover sealing cover which is movably hinged is installed on the inner groove, a fixing steel bar is installed in the steel bar fixing frame, and an on-plate clamping groove is formed in the surface of the pouring mold clamping plate. The adjusting sliding frame is installed at the position of the root of a wall needing to be reinforced, then the reinforcing devices are installed on the adjusting sliding frame in a back-to-back mode, the reinforcing devices clamp the wall in a butt mode, then the threaded anchor rods are sequentially inserted into the pouring mold clamping plates in a matched mode to form opposite pulling, and the threaded anchor rods are clamped and fastened; and finally, after a wall inserting fixing rod, a wall body connecting clamp and a fixing steel bar are inserted, concrete is poured into a guiding and conveying groove, the concrete and the wall body are combined and solidified, and the reinforcing work of the wall body is completed.

The invention discloses a mooring type high-pressure six-axis curtain wall cleaning unmanned aerial vehicle, and belongs to the technical field of curtain wall cleaning equipment. The water storage bin is vertically mounted below the center of the six-axis unmanned aerial vehicle, and a transfer pipe is mounted below the water storage bin; the high-definition camera is mounted above the fuselage of the six-axis unmanned aerial vehicle; the flushing device is fixed below the fuselage of the six-axis unmanned aerial vehicle, and the flushing device is communicated with the water storage bin; the atomizing and foam throwing unit is installed below the six-axis unmanned aerial vehicle and located on one side of the water storage bin, and an integrated water bin is fixed to one side of the flushing device; a six-axis unmanned aerial vehicle is adopted as the main rack layout, the atomization foam throwing angle can be automatically adjusted through the mainly-arranged atomization foam throwing unit, a foam water agent is evenly sprayed in a large area or centrifugally thrown out in a high-strength mode through a foam throwing disc, and stains on the surface of a curtain wall are flushed; the flushing device can linearly spray out high-pressure water through an alloy direct spray rod, and the efficient cleaning effect on the curtain wall is achieved.

The invention provides a reinforcing beam reinforced by adopting an out-of-service wind power blade and a method for determining the bending rigidity. According to the reinforcing beam, a plurality of grooves are formed in at least one surface of a reinforced concrete beam; the reinforcing layer comprises reinforcing ribs and a cement-based composite matrix, a plurality of protrusions are arranged on the surface of the cement-based composite matrix, the protrusions are arranged at intervals in the length direction of the cement-based composite matrix, and the protrusions are correspondingly embedded into the grooves, so that the reinforcing layer is connected with the reinforced concrete beam to obtain a reinforced concrete reinforced beam; wherein the reinforcing ribs are obtained by disassembling and cutting a main beam of the retired wind power blade. According to the reinforcing beam, the combining capacity of the reinforced concrete beam and the reinforcing layer is high, mutual slippage is avoided, the retired wind power blade composite material resources are utilized, the environment is protected, and the cost is saved while high-performance reinforcing treatment can be conducted on the damaged reinforced concrete beam structure or the reinforced concrete beam structure with insufficient bearing capacity.

The invention relates to an intelligent permeation grouting process and device for concrete crack self-repairing. The intelligent permeation grouting process and device are suitable for crack detection and repairing of a newly-built concrete structure. The device comprises a blood vessel network embedded into concrete, a crack detection sensor, a control module, a pumping module and a self-repairing material storage module, and automatic detection and repairing of cracks are achieved. The technological process comprises crack detection, data analysis, grouting parameter determination, material injection and repair monitoring. Through the automation and intelligence technology, the repairing efficiency and precision are remarkably improved, and the device is suitable for large structures such as bridges and tunnels.

The invention discloses an anti-seismic strengthening method and system suitable for historical buildings, and relates to the technical field of existing building strengthening. The invention discloses an anti-seismic reinforcement system suitable for historical buildings. The anti-seismic reinforcement system comprises a data modeling module, a risk assessment module, a disturbance analysis module, a buffer decision module, a reinforcement early warning module, a component reinforcement decision module, a collaborative reinforcement decision module and a scheduling optimization module. According to the method, the linkage stress relation and the collaborative response characteristics are identified by establishing the structure coupling model of the adjacent buildings and a strength correlation analysis method, and a theoretical basis and a judgment standard are provided for collaborative reinforcement of cross-building units; the collaborative reinforcement strategy is generated according to the linkage requirement, the collaborative mode and the deployment position are defined, and the overall coordination of the community-level reinforcement scheme and the linkage toughness of the structural system are enhanced.

The invention relates to the technical field of building construction, in particular to a building construction crack reinforcing device which comprises a plate body, an operation hole is formed in the upper end of the plate body and penetrates through the upper end and the lower end of the plate body, a sliding groove is formed in the lower end of the plate body in the left-right direction, and L-shaped sliding plates are slidably connected to the left side and the right side of the plate body through the sliding groove; the two sliding plates are combined together in a sliding mode, then the lower ends of the two sliding plates are inserted into the crack, the sliding plates are pushed towards the two sides, the lower ends of the sliding plates abut against the inner walls of the two sides of the crack respectively, the fixing part is inserted between the lower ends of the two sliding plates, and the two rotating plates are rotated to the left side and the right side of the other crack and fixed. The left end and the right end of the opposite-pull screw penetrate through the opposite-pull holes in the two butt joint plates correspondingly and are in threaded connection with the adjusting nuts, the two butt joint plates are fixed, the two rotating plates are further fixed, fixing of the crack is enhanced, then slurry is injected into the crack for repairing, and the irregular crack can be fixed.

The utility model relates to the field of shell supports, in particular to an adjustable elastic support which comprises a support body, a jacking mechanism arranged on the support body and a support body slidably connected to the top of the support body through the jacking mechanism. The jacking mechanism comprises a positioning assembly arranged on the supporting body and an elastic piece arranged between the positioning assembly and the supporting body, the positioning assembly is used for adjusting the height of the bottom end of the elastic piece, and the supporting body is connected with the vault. The height of the bottom end of the elastic piece is adjusted through the positioning assembly, the elastic piece is compressed, the upper end of the elastic piece is static due to the fact that the elastic piece is connected with the jacking body, when the elastic piece is compressed to the preset length, the jacking force can be known by observing the upward moving distance of the lower end of the elastic piece, and accurate control is facilitated.

The invention provides a machine vision unmanned aerial vehicle curtain wall cleaning control system and method, and belongs to the field of image processing. The system comprises a pollution area identification module, a visual distance processing module, a distance measurement fusion processing module and a pollution level identification module. Wherein the pollution area identification module is used for acquiring a first pollution area, a second pollution area and a pollution similarity coefficient; the visual distance processing module is used for obtaining a first curtain wall distance; the distance measurement fusion processing module is used for collecting a second curtain wall distance and obtaining a curtain wall distance in combination with the first curtain wall distance; the pollution level identification module is used for obtaining the pollution level and carrying out unmanned aerial vehicle cleaning control. The technical problem of insufficient cleaning control precision caused by inaccurate distance measurement during curtain wall cleaning of the unmanned aerial vehicle in the prior art is solved, and the technical effects of improving the curtain wall distance measurement precision and realizing accurate cleaning control are achieved.

The invention belongs to the technical field of wall joint filling, and relates to a wall cracking joint filling agent and a wall joint filling process, the wall cracking joint filling agent comprises a cement-based cementing material, fine aggregate, modified toughening fiber, modified nano zinc oxide, a dispersing agent, a defoaming agent, a water-retaining agent and a mildew preventive; the modified toughened fiber is obtained by sequentially carrying out alkali etching, dopamine coating and intercalated kaolin loading on polyacrylonitrile fiber; the modified nano-zinc oxide is obtained by modifying nano-zinc oxide through a silane coupling agent and coating and modifying the nano-zinc oxide through chitosan. According to the wall crack repairing agent provided by the invention, the modified toughening fibers and the modified nano zinc oxide which are subjected to surface functionalization treatment are introduced, so that the crack resistance and toughness of a cement-based crack repairing material can be remarkably improved, the occurrence probability of secondary cracking after repairing can be remarkably reduced, meanwhile, lasting and effective mildew-proof and antibacterial capabilities can be provided, microbial erosion can be inhibited, and the service life of the wall crack repairing agent is prolonged. And good construction operability and basic mechanical properties of the material are maintained.

The utility model relates to the technical field of constructional engineering, and discloses structural gap grouting equipment for constructional engineering construction, which comprises a base, a grouting mechanism is arranged at the top of the base, the grouting mechanism comprises a box body and a pump machine, the box body and the pump machine are both fixedly connected with the base, the input end of the pump machine is communicated with the base, and the output end of the pump machine is communicated with the base. The output end of the pump machine communicates with a grouting pipe through a hose, and a moving mechanism is arranged in an inner cavity of the base. By arranging the grouting mechanism, slurry condensation can be avoided, a grouting pipe can be conveniently used for grouting by opening a pump, the device is convenient to move by arranging the moving mechanism, a user can conveniently push the device by pushing a handle, the grouting pipe can be fixed by arranging the adjusting mechanism, and the grouting pipe can be driven to rotate by opening a third motor. The grouting direction can be adjusted conveniently, the height of the grouting pipe can be adjusted by starting the first motor, grouting can be conducted on ceilings, floors and vertical joints, and use is convenient.

The invention provides an ancient city wall repairing grouting material, a preparation method and a grouting device, and relates to the field of city wall repairing, the grouting material comprises the following components by weight: 50-60 parts of slaked lime, 15-20 parts of cement, 25-60 parts of mineral powder, 90-120 parts of sea sand, 10-30 parts of modified shell powder, 30-40 parts of water, 10-15 parts of glutinous rice slurry, 1-3 parts of alum, 7-9 parts of a bacillus pasteurii liquid, and 7-8 parts of a mineralization reaction liquid. The grouting device comprises a grouting device body, a discharging pipe and a grouting supporting mold, and a stirring mechanism is arranged at the top of the grouting device body; the grouting supporting mold comprises a base, a main frame, a plurality of adjusting plates and a plurality of extension rods. Through the synergistic effect of the microorganisms, the modified shells and the mineral powder, efficient preparation of the ancient city wall slurry from old to old, modification treatment of shell carriers and regulation and control of the acid-base environment of the microorganism slurry are achieved, urease-driven carbonate precipitation generation and color fixation are achieved, and a new solution is provided for the microorganism grouting technology.

The invention discloses a modular steel structure building connecting joint and a design, construction and disassembly method thereof, which are used for connecting an upper layer module unit and a lower layer module unit or a lower layer foundation, and a frame column is a split type frame column and comprises an upper column section, a lower column section, a connecting steel plate and a column transverse locking pin shaft, the quick positioning, assembling and disassembling assembly comprises a pressure-bearing gusset plate, a conical guide column and a node transverse locking pin shaft, the pressure-bearing gusset plate is horizontally arranged and used for being connected with a lower-layer module unit or a lower-layer foundation, and the conical guide column is fixedly connected to the top face of the pressure-bearing gusset plate. The connecting joint is convenient to transport, can be quickly mounted on site, and can be reused after being dismounted.

The invention discloses a storey-adding construction method for a basement with an existing box type foundation and a multi-layer frame structure, and belongs to the technical field of constructional engineering and city renewing.The storey-adding construction method comprises the following steps that S1, storey-adding buildings of the existing basement are evaluated; s2, underground diaphragm wall construction; s3, reinforcing the existing basement storey-adding building foundation; s4, the overground structure of the existing basement storey-adding building is reinforced; s5, foundation underpinning construction is conducted; s6, earth excavation is conducted at the storey-adding position of the existing basement; s7, construction of a storey-adding foundation bottom plate; and S8, layer-adding underpinning column and top plate construction. According to the storey-adding construction method for the basement with the box type foundation and the multi-layer frame structure, storey-adding transformation is conducted on the basement of an existing building, the usable area of the building is effectively increased, the construction efficiency is improved, the influence on the surrounding environment is reduced, and the urban development and the ever-increasing space requirements of people are met.

According to the rapid rope threading construction method for dismantling the continuous beam, the steel wire rope penetrates through the top opening in the top plate, the edge opening in the flange plate and the side opening in the side web plate and then is connected to the hook of the floating crane, the steel wire rope can be prevented from moving relative to the cut section during hoisting, and the construction safety is improved; meanwhile, according to the hole forming mode, the length of the needed large-diameter steel wire rope is small, the weight of the large-diameter steel wire rope is light, the advantage that the floating crane has multiple lifting points is combined, and a crane does not need to be matched for rope penetrating in the construction process, so that on the premise that extra large mechanical equipment such as the crane is not adopted, rapid hole forming and installation of the 54 mm large-diameter lifting steel wire rope are completed, and the construction efficiency is improved. Finally, the purposes of improving the dismantling efficiency of each section of the continuous beam and reducing the construction cost are achieved.

The invention relates to the technical field of cement-based patching materials, in particular to a modified brucite fiber reinforced magnesium phosphate cement-based patching material and application thereof. The repairing material comprises the following components in parts by weight: 60-70 parts of magnesium oxide, 15-20 parts of phosphate, 5-9 parts of a retarder, 3-5 parts of modified brucite fibers and 10-15 parts of water. The modified brucite fiber is prepared by the following method: (1) soaking brucite fiber in a dihydric phosphate solution, separating out the brucite fiber after soaking, washing and drying to obtain pretreated fiber; and (2) placing the pretreated fiber in an absolute ethyl alcohol solution of methyltrimethoxysilane, then reacting under a heating condition, separating out the fiber after the reaction is completed, and drying to obtain the modified brucite fiber. The problem that the fluidity, the bonding strength and the fracture toughness of a magnesium phosphate cement-based thin layer repairing material doped with fibers cannot be considered at the same time is effectively solved.

The invention provides a cleaning device and a cleaning robot. The cleaning device comprises a roller assembly and a mounting frame, the roller assembly is used for washing a surface to be cleaned, the mounting frame is provided with a mounting groove, and the roller assembly is arranged in the mounting groove and rotationally connected with the mounting frame; a water recycling thin cavity is formed in one side of the mounting groove, an opening used for recycling water stains on the working face is formed in the side, close to an opening of the mounting groove, of the water recycling thin cavity, and a plurality of water drainage openings are formed in the side, away from the opening, of the water recycling thin cavity; a sewage inlet communicated with the mounting groove is further formed near the middle of the water recovery thin cavity, a water squeezing block used for squeezing the roller assembly is arranged at the sewage inlet, the water squeezing block is a water scraping strip perpendicular to the roller assembly in the radial direction, and the water squeezing block and the sewage inlet extend in the length direction of the roller assembly. Sewage carried by the roller assembly and residual water stains on the wall surface can be effectively recycled at the same time, and the wall surface cleaning effect is good.

To provide a method for removing a floor slab of a composite girder capable of reducing concrete remaining on the girder.SOLUTION: Since a cutting-in 5 extending in the bridge-axis direction is formed from the upper surface side of a floor slab at each arrangement location of a slippage preventing member 4 of a floor slab 3, and the floor slab 3 on which the cutting-in 5 is formed is pulled upward from main girders 2 and removed, the resistance force between the slippage preventing member 4 and the concrete of the floor slab 3 against the tensile load can be reduced by the cutting-in 5, and the floor slab 3 can be easily separated from the main girders 2. Thus, since it is not necessary to cut the floor slab 3 in the bridge axial direction such that concrete remains on the main girder 2 as in the related art, the floor slab 3 on the main girder 2 can be lifted and removed at once without being divided in the direction perpendicular to the bridge axis. As a result, the efficiency of the removal work can be improved, and there is an advantage that a large-scale concrete crushing work is not required.SELECTED DRAWING: Figure 5

The utility model relates to a construction platform supporting structure, and relates to the field of supporting structures, the construction platform supporting structure comprises a lower layer supporting structure arranged at the bottom of a platform body and a wall-attached supporting structure arranged at the top of the platform body, the platform body is supported by the lower layer supporting structure, and the edge of the platform is supported by the wall-attached supporting structure; the lower-layer supporting structure and the wall-attached supporting structure are both located at the position close to the wall edge, and the position of the lower-layer supporting structure corresponds to the position of the wall-attached supporting structure. According to the platform, partial load borne by the platform can be transmitted to the wall-attached supporting structure, and is transmitted to the platform body at the bottom and the lower-layer supporting structure through the wall-attached supporting structure, so that the overall stability and bearing capacity of the platform are improved.

The invention discloses a green energy-saving curtain wall and a construction transformation method thereof, and relates to the technical field of building curtain walls, the green energy-saving curtain wall comprises a glass frame, two ventilation box bodies and a photovoltaic frame, the two ventilation box bodies are installed at the upper end and the lower end of the glass frame respectively, and the photovoltaic frame is fixedly installed on the side wall of the glass frame; a clamping and fixing structure is installed in the glass frame, ventilation control structures are installed in the two ventilation box bodies, connecting structures are installed on the outer sides of the two ventilation box bodies, and an extending control structure is installed on one side of the photovoltaic frame. According to the green energy-saving curtain wall, through multi-structure innovative cooperation and multi-structure collaborative design, functionality, installation efficiency and energy utilization efficiency are optimized, thin film photovoltaic glass and an adjustable photovoltaic panel are adopted for collaborative power generation, the thin film photovoltaic glass is embedded in a curtain wall body, and the angle-adjustable photovoltaic panel extending out of a frame is combined, so that the curtain wall is more energy-saving and environment-friendly. And a dual power generation structure is formed.

Disclosed are a grouting repair system based on a composite high polymer and a method for using same. The grouting repair system comprises a bottom plate, and an insertion hole is formed in the middle of the bottom plate. A grouting pipe is inserted into the insertion hole. A sealing assembly is further arranged on the bottom plate. The sealing assembly comprises a lifting frame, and the lifting frame is connected to the bottom plate so as to slide up and down. A plurality of supporting frames are evenly arranged on the lifting frame, and sliding blocks are slidably connected to the supporting frames. Pressing plates are arranged below the sliding blocks. According to the present invention, all of the pressing plates will synchronously slide downwards by means of downward sliding of the lifting frame, then all of the pressing plates can seal an opening part of a pavement crack below the bottom plate. The grouting pipe is inserted into the interior of the crack, at which time polyurethane is injected into the interior of the crack from the interior of a liquid outlet hole. Since the pavement crack is sealed by the pressing plates, the polyurethane injected into the crack can be prevented from flowing out through the opening part of the pavement crack prematurely before the crack is fully filled. As a result, complete filling of polyurethane within a crack can be ensured, thereby improving the quality of polyurethane repairing a pavement crack.

A micro injection assembly for the repair of floors that includes an adapter body operably configured to couple with a tube having adhesive and defining an internal channel, a hub selectively removably coupled to the adapter body and having a rigid needle member coupled thereto and recessed within the hub, wherein the rigid needle member projects outwardly from the second end of the hub in a linear orientation, has a blunt distal end, and defines a needle channel spanning the length of the needle member. The assembly also includes a cap selectively removably couplable to the adapter body in a watertight configuration and with the cap disposable in an overlapping configuration with the adapter body. The assembly is operable to effectuate emission of an adhesive material from a tube through the adapter body, hub, and needle member to spaces between a flooring material and subfloor.

The invention relates to the field of buildings, in particular to an externally-reinforced concrete-filled steel tube column and a peak bearing capacity calculation method, and the externally-reinforced concrete-filled steel tube column comprises a steel tube and core concrete located in the steel tube; a UHPC layer is poured on the outer ring of the steel pipe, the section of the outer ring of the UHPC layer is square, and the center line of the UHPC layer coincides with the axis of the steel pipe. Stirrups located on the outer ring of the steel pipe are embedded in the UHPC layer, and longitudinal steel bars are arranged on the inner ring of the stirrups in the vertical direction. The invention provides an external reinforcement type concrete filled steel tubular column. The method can reinforce the concrete filled steel tube with the annular void area, so that the actual bearing capacity of the concrete filled steel tube exceeds the original design value level. The invention further provides a method for calculating the peak bearing capacity of the externally-reinforced concrete-filled steel tube column, the peak bearing capacity of the reinforced concrete-filled steel tube can be quantitatively evaluated, and a theoretical basis is provided for subsequent use and maintenance of the concrete-filled steel tube.

The invention discloses a high-performance concrete repairing material, application and a concrete structure repairing method, and belongs to the technical field of concrete structure repairing. The high-performance concrete repairing material is prepared from Portland cement, rapid hardening cement, an inert mineral admixture, an early strength agent, a submicron mineral admixture, a nano material, an anti-freezing binder, fibers, a retarder, a volume compensating agent, fine aggregate, coarse aggregate, a water reducing agent, a defoaming agent and water. Through the interaction of all the components, the functions of early strength, volume stability, freezing resistance, salt freezing resistance, fracture resistance, shrinkage resistance and the like are achieved, through the synergistic effect of all the components in the material, the overall performance of the material is improved, and the material has excellent adaptability and multifunctionality under different environmental conditions; therefore, long-term stable guarantee is provided for application in various damage scenes, and the proportion of each component of the material can be adjusted according to actual requirements of concrete structures so as to meet efficient repair in different damage scenes.