230results about How to "Ensure structural safety" patented technology

The invention relates to the technical field of concrete pouring, in particular to a concrete pouring homogeneity detection system and method based on sensing data, and aims at achieving efficient and accurate concrete pouring homogeneity evaluation and defect detection. The system comprises a multi-sensor sensing module, a multi-sensor data conversion and transmission module and a concrete homogeneity evaluation module, the multi-sensor sensing module comprises a temperature sensor, an ultrasonic sensor and a vibration sensor; the multi-sensing data conversion and transmission module is used for acquiring multi-sensing data and performing data type conversion and transmission on the multi-sensing data; and the concrete homogeneity evaluation module is used for constructing a concrete pouring homogeneity evaluation model to detect and evaluate the homogeneity and defects in the concrete pouring process. According to the invention, detection and evaluation of the concrete pouring homogeneity are realized through combination of multi-sensing data, and the accuracy of detection of the concrete pouring homogeneity is improved.

The invention discloses an efficient flight control system of a low-altitude manned unmanned aerial vehicle based on tilting composite wings, and relates to the technical field of unmanned aerial vehicle control systems. The low-altitude manned unmanned aerial vehicle efficient flight control system based on the tilting composite wings comprises an initialization and pre-check module, a vertical take-off and landing control module, a transition flight control module, an obstacle avoidance and path planning module and a landing control module. Through integration of vertical take-off and landing, smooth transition to cruise, intelligent obstacle avoidance, path planning and other modules, autonomous and efficient flight in a complex environment is realized, and the application scene of the unmanned aerial vehicle is greatly widened. Meanwhile, the accurate flight control and data post-processing analysis capability not only guarantees the safety and comfort of passengers, but also promotes the continuous optimization of the system performance through the real-time performance evaluation and feedback mechanism. In addition, the aerial refueling / charging technology is supported, the cruising ability is prolonged, and the task execution continuity and flexibility are enhanced.

The invention relates to the technical field of structure health monitoring and bearing capacity evaluation, and discloses a heat absorption tower hybrid structure dynamic detection bearing capacity evaluation method, which comprises the following steps: S1, arranging various sensors on a heat absorption tower structure, including an acceleration sensor, a strain gauge, a temperature sensor and a displacement sensor, collecting dynamic response data of the heat absorption tower under different working conditions; s2, on the basis of data collected by the sensors, a digital twin model of the heat absorption tower is built, and the model comprises finite element three-dimensional models of a tower footing, a tower body and a tower top. Real-time monitoring and high-precision prediction of the heat absorption tower are realized through a sensor network and a digital twinning technology, structural problems can be intelligently identified and early warning can be carried out in advance, meanwhile, a maintenance strategy is optimized based on fault prediction of AI, the maintenance cost is reduced, the equipment operation efficiency is improved, and the accuracy of structural analysis is further improved through introduction of the digital twinning technology. And the long-term safety and stability of the heat absorption tower are ensured.

The invention discloses an intelligent bridge shock isolation device with a replaceable sensor and an installation method.The device comprises a connecting module, the connecting module comprises a support bottom connecting plate (7) and a sliding module arranged at the top of the support bottom connecting plate (7), and the sliding module comprises an upper friction plate (1), a lower friction plate (4) and an arc-shaped sliding block (3); the data measurement module comprises a sensing force holding layer (5) arranged at the bottom of the lower friction plate (4), the sensing force holding layer (5) is provided with a sensor module (8), and the replacement module comprises a sensor assembly layer (6), an internal wedge block (9) and an external wedge block (10). A sliding friction pair is jointly formed by the connecting module and the sliding module, so that the good damping performance of the support is achieved, meanwhile, the stress state of a bridge is monitored in real time through the data measuring module, intelligent monitoring and jacking installation and rapid replacement of the sensor module are achieved, and the problem that a traditional bridge support cannot be rapidly and safely replaced is solved.

The invention provides a performance-adaptive anti-overturning vibration double-control support. The support comprises an upper convex outer cylinder and a lower convex outer cylinder, the limiting guide body is vertically arranged between the bottoms of the two outer barrels, the limiting guide body is sequentially sleeved with a first-order spring, a limiting partition plate, a second-order spring and a lower limiting base plate from top to bottom, and the upper end and the lower end of the first-order spring abut against the inner side of the bottom of the downwards-protruding outer barrel and the upper end face of the limiting partition plate respectively. The upper and lower ends of the second-order spring respectively abut against the lower end surface of the limiting clapboard and the upper end surface of the lower limiting base plate; the upper end of the limiting guide body is fixedly connected with the bottom of the downward-protruding outer cylinder, the lower end of the limiting guide body is fixedly connected with the damping tensile plate, the damping tensile plate is located between the bottom of the upward-protruding outer cylinder and the lower limiting base plate, and the space between the inner side of the bottom of the upward-protruding outer cylinder and the lower limiting base plate is filled with damping liquid; an upper limiting fixing piece and a lower limiting fixing piece are arranged on the inner side cylinder wall of the upwards-protruding outer cylinder and used for limiting or determining the upwards-moving limit position of the limiting partition plate and the downwards-moving limit position of the lower limiting base plate respectively.

The invention relates to the field of tubular column life dynamic prediction, in particular to a tubular column life dynamic prediction method based on corrosion logging detection, which comprises the following steps of: constructing target parameters influencing the corrosion rate of a test tubular column by utilizing a single parameter change test, and calculating the acid gas partial pressure, the liquid holdup and the fluid flow state of each monitoring point; the corrosion rate corresponding to the monitoring point is determined by adopting electromagnetic flaw detection logging, a corrosion rate prediction model is established by adopting a neural network prediction method, and future target prediction parameters are determined by predicting the gas production rate, the water production rate and the formation pressure of each year in the future; therefore, the corrosion rate of each year in the future is determined; calculating the residual wall thickness of the future year, determining an internal pressure resistance safety coefficient and an external extrusion resistance safety coefficient, determining the residual life of the to-be-predicted tubular column, and timely sending out early warning information; and transmitting the early warning information and the collected data to a terminal by using a wireless communication technology to monitor the tubular column in real time. Therefore, the dynamic performance of gas well life prediction is realized.

The present invention discloses a fireproof steel structure for construction, which belongs to the technical field of building materials. A fireproof steel structure for construction, comprising a fireproof steel body, characterized in that a fireproof coating is provided on the outer surface of the fireproof steel body, a thermal insulation layer is provided on one side of the fireproof coating, a cavity pipe is provided inside the fireproof steel body, a spray pipe is provided on the outer surface of the fireproof steel body, and a first spray head is fixedly connected to one side of the spray pipe; the present invention can effectively prevent fire and resist high temperature by providing a fireproof coating, a thermal insulation layer and a cavity pipe, thereby increasing the fire resistance time, providing precious time for disaster relief and fire fighting, avoiding the deformation of the steel structure due to the failure to put out the fire in time, ensuring the structural safety of the factory building, and thus effectively reducing the loss, and can generate flowing water by providing a spray pipe and a connecting pipe.

The invention relates to a universal auxiliary frame for a water elasticity ship model pool test and a use method. The universal auxiliary frame comprises a frame, the movable horizontal cross beam is connected with the frame supporting end face through a bolt in a horizontally adjustable manner; the vertical supporting rod is used for supporting the ship model and ensuring the stability of the ship model; the transverse gradienter and the longitudinal gradienter are respectively arranged at different positions of the frame and are used for ensuring the horizontal state of the frame. The frame is compact and reasonable in structure and convenient to operate, the frame is specially customized for the sectional type ship model, the structural safety and stability of the ship model in the hanging, transporting, equipment installing and testing processes are effectively improved through a firm and accurate supporting structure, and meanwhile in the testing process, the test efficiency is improved. The precision measurement system arranged in the frame can accurately monitor the swing period and the horizontal state of the ship model, and ensures the accuracy of the ballast position and the accurate correspondence between the ship model and the real ship mass distribution and the swing period.

The invention relates to the technical field of off-grid renewable energy hydrogen production, and discloses an off-grid alkaline hydrogen production system and a power adaptive distribution and safety control method thereof, the off-grid alkaline hydrogen production system comprises a renewable energy power supply unit, a parallel electrolytic cell module, a gas-liquid treatment system and a main controller; in the Faraday hydrogen production mode, the bubble volume is compressed by adjusting the operation pressure so as to modulate the impedance characteristic of the electrolytic cell, and the energy efficiency is improved in cooperation with current control; and in the non-Faraday polarization hot standby mode, the voltage of the rectifier cabinet is controlled to be clamped to a non-gassing polarization interval, and liquid level plugging is constructed in the U-shaped communicating pipeline according to the fluid statics principle. The system is further provided with a transient buffering strategy based on the pneumatic capacity, and pressure attenuation is delayed through the gas dead zone volume when power is suddenly reduced. The problems of hydrogen production efficiency optimization, low-power safe hot standby and mechanical protection under wide power fluctuation are effectively solved.

The invention relates to the technical field of grouting monitoring and early warning, and particularly discloses a dynamic grouting monitoring and early warning method and system.The method comprises the steps that by obtaining video dynamic data which cannot be tampered in a grouting video detection management system, the uploading qualification degree of a video can be dynamically obtained in real time, and whether video shooting needs to be conducted again or not is judged; the authenticity and effectiveness of subsequent grouting operation detection on each grouting operation dynamic video are guaranteed, so that grouting operation detection is carried out on each grouting operation dynamic video, detection information of each grouting operation is extracted, key variables are grabbed, analyzed and judged, and the construction risk index of each grouting operation is obtained. Therefore, construction problems occurring in the grouting construction process are found and early warned in time, accurate measures are formulated, the risk problems in the grouting construction process are stably solved, the grouting construction quality is guaranteed, and the long-term stability of the structure in a grouting area is guaranteed.

The invention provides a multi-point gravity expansion type foundation for a truss type tower, which comprises a plurality of foundation units and is characterized in that each foundation unit comprises an upper cylindrical bearing platform, and the bottom of each upper cylindrical bearing platform is a lower circular platform bearing platform; the top of one foundation unit is connected with one side stand column of the truss type tower, so that the multi-point array type gravity expansion type foundation structure is formed. The foundation structure is mature in construction technology, safe and reliable in strength, capable of well supporting a truss type tower structure and capable of serving as a foundation scheme of the truss type tower.

The invention discloses a building wind-resistant damping device which comprises an installation base fixedly installed at the top end in a building and a damping ball located below the installation base, and a damping hanging seat and a disc-shaped damping hanging disc are sequentially arranged between the installation base and the damping ball from top to bottom. Through cooperation of the multiple damping vibration attenuation mechanisms, the influence of multi-direction composite vibration such as horizontal vibration, vertical vibration and torsional vibration on a building is greatly reduced, comprehensive absorption and dissipation of various vibration energy are facilitated, the situation that the building generates large displacement and various vibration such as horizontal vibration, vertical vibration and torsional vibration under the action of strong wind is avoided, and the construction quality is improved. The safety of a building structure is greatly guaranteed, the defect that an existing building wind-resistant damping device is difficult to effectively cope with complex wind vibration influences due to the fact that a single-direction damping mode is adopted is overcome, particularly, the composite wind vibration influences on a high-rise building in the horizontal direction, the vertical direction and the twisting direction can be well coped with, and the wind-resistant damping device is suitable for application and popularization.

The utility model relates to the technical field of 3D printing, and discloses a 3D printing piece polishing machine which comprises a machine body, a polishing piece is installed on the surface of the machine body and comprises a motor installed on the surface of the machine body, a first bevel gear is installed at the output end of the motor, a rotating rod is arranged at the top of the first bevel gear, and a fixing ring is installed on the surface of the rotating rod. The fixing ring is fixedly connected with the machine body, a second bevel gear is fixedly connected to the surface of the rotating rod and located on the inner side of the fixing ring, the surface of the rotating rod is movably sleeved with a third bevel gear, the third bevel gear, the first bevel gear and the second bevel gear are meshed with one another, an air bag is installed at one end of the rotating rod, and the air bag extends into the roller through the cover plate. According to the 3D printing piece polishing machine, the polishing piece is arranged, the printing piece can be efficiently polished within a short time, and therefore the problem that the surface of the printing piece is polished unevenly or the surface quality does not reach the standard due to the fact that polishing materials are distributed unevenly can be solved.

The invention discloses an externally-wrapped concrete UHPC-stainless steel combined formwork air shaft structure and a construction method, the externally-wrapped concrete UHPC-stainless steel combined formwork air shaft structure comprises a UHPC-stainless steel combined formwork, staggered hole PBL shear keys, a reinforcement cage and external concrete, the UHPC-stainless steel combined formwork comprises a stainless steel cylinder and prefabricated UHPC, and the staggered hole PBL shear keys are arranged on the outer wall of the stainless steel cylinder. The performance advantages of a combined structure and an assembly type structure are combined, the rigidity and the bearing capacity of the UHPC-stainless steel combined formwork are enhanced, and the problems that a traditional stainless steel sheet is prone to deformation, bulging and protruding in the construction stage are effectively solved. Connection of the prefabricated UHPC, the stainless steel cylinder and external concrete is completed through the staggered hole PBL shear keys, the shear resistance between interfaces is improved, and cooperative work of all parts is guaranteed. The modular assembly type construction technology is adopted, the construction efficiency and the construction progress can be remarkably improved, the well wall thickness and the material consumption are reduced, and the method has remarkable performance advantages and wide application prospects in nuclear engineering structures.

The invention discloses a method for predicting the residual fatigue life of a titanium alloy component based on frequency mixing nonlinear ultrasound. The method comprises the following steps: firstly, building a detection system; the detection system is controlled to generate low-frequency f1 and high-frequency f2 sinusoidal signals to carry out frequency mixing excitation on the titanium alloy component, and ultrasonic response signals are collected; performing frequency domain analysis on the ultrasonic response signal, extracting a characteristic amplitude and calculating a nonlinear modulation parameter beta m; then, a Nazarov-Sutin equation and an Elber equation are combined, and a theoretical prediction model of the nonlinear modulation parameter beta m changing along with the fatigue life percentage f is constructed; finally, actual measurement parameters are substituted into the model to reversely derive the consumed fatigue cycle number N, and the residual fatigue life Nr is predicted by combining the critical failure total cycle number Nt of the component. According to the method, the quantitative mapping relation between the nonlinear acoustic parameters and fatigue damage accumulation is revealed by establishing the physical model, and accurate quantitative prediction of the residual fatigue life of the titanium alloy component is achieved.

The invention relates to an underground station structure under an existing viaduct and a construction method thereof.The underground station structure is located below the existing viaduct and comprises a station diaphragm wall, station stand column piles, a station top plate, a station middle plate, a station upper layer side wall, a station bottom plate, a station lower layer side wall and a concrete barrel wall; the underground station is located below the existing viaduct and is implemented by adopting a cover and excavation reverse method. The laminates of the underground station and the enclosure structure provide horizontal support for the foundation pit in the construction period, and the number of temporary structures is reduced; the concrete supporting blocks are arranged on the laminates of the underground station, horizontal constraint from top to bottom is provided for existing viaduct piles, the viaduct structure safety is guaranteed, and it is guaranteed that viaduct operation is not interrupted in the construction period; the concrete supporting blocks only provide horizontal acting force between the station structure and the bridge pile structure, meanwhile, the surfaces of the bridge piles are treated, it is guaranteed that the surfaces of the bridge piles are smooth, and mutual acting force is not generated between the bridge piles and the station in the vertical direction.

This utility model provides a reinforced concrete foundation and photovoltaic support suitable for mountain foundations. The foundation includes a rock anchor bolt foundation and an above-ground reinforced concrete foundation. The rock anchor bolt foundation includes rock mass with drilled holes, anchor bolts anchored into the drilled holes, and anchor bolt fixing reinforcement connected to the upper end of the anchor bolts. The anchor bolt fixing reinforcement is embedded in the above-ground reinforced concrete foundation. The above-ground reinforced concrete foundation includes a foundation platform and short reinforced concrete columns extending vertically upwards from the centroid of the foundation platform. The bottom of the photovoltaic support column is embedded in the short reinforced concrete column. The rock anchor bolt foundation and the above-ground reinforced concrete foundation are formed as a single structure through the reinforced concrete structure, which can effectively fix the above-ground reinforced concrete foundation. This avoids the risk of the power station overturning due to excessive pull-out force on one side of the foundation caused by excessive eccentricity between the column and the foundation centroid due to terrain limitations or construction deviations.

The invention discloses a mounting method of an arch springing structure. The mounting method comprises the following steps that 1, the arch springing structure is divided; step 2, arch foot concrete structure construction; step 3, support jig frame and operation platform installation: the support jig frames are installed, and the operation platforms are erected between the upper concrete foundation and the support jig frames and between the support jig frames; 4, arch foot structure installation, wherein lower chords are hoisted, and web members between the lower chords are hoisted; the diagonal web members between the lower chord members and the bottommost upper chord members are firstly installed on the lower chord members, the bottommost upper chord members are hoisted, the upper chord members are fixed to the arch foot supports and the diagonal web members at the corresponding positions, and then the web members between the bottommost upper chord members and between the bottommost upper chord members and the lower chord members are installed. The operation platform is arranged on the upper portion of the supporting jig frame in the most economical supporting mode, the supports are combined with the platform, high-altitude in-situ bulk loading is carried out on the arch springing, the installation cost and the installation difficulty are greatly reduced, and meanwhile the safety of constructors is guaranteed.

The utility model discloses a building wall based on BIM (Building Information Modeling). The building wall comprises a main body structure, an internal wall body and a monitoring component, wherein the main body structure serves as an external structural part of a building wall body and is used for fixing other parts and providing support; the internal wall body is fixedly arranged in the main body structure, serves as a functional layer of the building wall body and also plays a role in supporting the main body structure; and the monitoring component is used for monitoring the use stability. The wall body with the sound insulation and heat preservation effects is formed by orderly assembling the main body structure and the internal wall body, the construction time and cost are saved, the construction efficiency is improved, meanwhile, the integrated design ensures that the sound insulation and heat preservation performance of the building wall body is more reliable and balanced, and inconsistency or imperfection possibly caused by post-processing is avoided; besides, the stability and the sealing performance of the wall body are monitored through the monitoring component, so that use and installation of the wall body are guaranteed, and the practicability of the wall body and the building quality and value are improved.

This invention discloses a simplified calculation method for determining the length of anchorless sheet piles in bank protection reinforcement, belonging to the field of foundation pit support technology. The method includes the following steps: Step S1, performing pile length sensitivity analysis to examine the influence of the total sheet pile length L, soil cohesion c, and internal friction angle on the pile top displacement; Step S2, establishing a pile top displacement prediction formula based on the passive earth pressure coefficient theory and fitting multiple sets of working condition data; Step S3, establishing a simplified design process of "parameter determination - formula inversion - optimization verification," using the pile top displacement prediction formula to invert and solve for the optimized pile length based on soil parameters and the maximum pile top displacement, and comparing it with the minimum pile length that satisfies kick-toe stability to determine the final design pile length. This invention simplifies "trial calculation iteration" to "precise inversion," improving the design efficiency of anchorless sheet piles and achieving a balance between safety and economy by quantifying the influence of parameters.

The application discloses a kind of deep melting interlayer development area rigid pile composite foundation structure design method, it is related to rigid pile composite foundation field, including the following steps: step one, in the existing rigid pile bearing capacity calculation process, front-end increase subgrade-ground temperature field analysis;Step two, increase groundwater analysis;Step three, determine the compression modulus of the soil layer of seasonal freeze-thaw layer, (water-rich) melting interlayer, permafrost layer, bearing capacity characteristic value, check the single pile bearing capacity characteristic value of different positions in the cross section of roadbed using different pile length, pile diameter, pile body stiffness material;Step four, carry out zoned unequal design, adjust pile length, pile diameter, pile body stiffness, so that the range of all pile single pile bearing capacity characteristic values in cross section is lower than design allowable value.The application effectively optimizes pile foundation design, reduces material waste, reduces engineering cost, while ensuring the safety and stability of structure.

This invention relates to the interdisciplinary fields of underground rock engineering and pressure vessel structural safety, specifically to a method for designing the wall thickness of steel linings in high-pressure underground gas storage facilities based on joint load-bearing. This invention establishes a joint load-bearing structural model of the steel lining and surrounding rock, upgrading the traditional model of the steel lining bearing pressure alone to a collaborative stress-bearing model. Through mechanical calculations, the internal pressure sharing effect of the surrounding rock is quantified, avoiding the thickness redundancy caused by neglecting the contribution of the surrounding rock stiffness, effectively reducing the cost of the steel lining and the amount of welding work. Secondly, based on cyclic working loads, the actual stress amplitude of the steel lining is calculated, establishing a quantitative correlation between rock mass characteristics, cyclic pressure, and the stress state of the steel lining, solving the problem that traditional methods cannot quantify fatigue risk. Finally, through multi-dimensional constraint verification and iterative optimization, it ensures that the steel lining simultaneously meets fatigue, static, and structural requirements, achieving wall thickness reduction while ensuring safety, thus balancing engineering safety, economy, and construction feasibility.

This utility model discloses a windproof backflow prevention structure for cooling tower louvers. It relates to the field of cooling tower louver accessories and includes: an external window frame, an anti-blowing mechanism, and an anti-detachment mechanism. The external window frame has an installation frame at its rear end and a side frame on its side. A limiting shaft is vertically installed inside the side frame, and a slider is sleeved on the outside of the limiting shaft. A return spring is sleeved on the outside of the slider, and a rack is installed on the outside of the slider. The anti-blowing mechanism prevents wind from directly impacting the surface of the external window frame, and the anti-detachment mechanism prevents the external window frame and installation frame from falling off. This windproof backflow prevention structure for cooling tower louvers, by rotating the external wind shield to change its angle, blocks wind from directly impacting the external window frame, reduces the impact of wind on the interior of the cooling tower, ensures stable airflow inside the cooling tower, maintains cooling efficiency, and requires no manual intervention.

The invention provides a double-steel-bar truss net plate interlocking combined wall which comprises a first bottom formwork and a second bottom formwork, the first bottom formwork is provided with a first surface, the first surface of the first bottom formwork is provided with a plurality of first steel bar trusses distributed in parallel in the first direction, the first steel bar trusses extend in the second direction, and the first direction is perpendicular to the second direction; the first steel bar truss protrudes out of the surface of the first bottom formwork. The second bottom formwork is provided with a second surface, the second surface is provided with a plurality of second steel bar trusses distributed in parallel in the first direction, the second steel bar trusses extend in the second direction, and the second steel bar trusses protrude out of the surface of the second bottom formwork; the first surface faces the second surface, the first bottom formwork and the second bottom formwork are stacked, a hollow layer is formed between the first bottom formwork and the second bottom formwork, and the first steel bar truss and the second steel bar truss are located in the hollow layer; the penetrating ribs are located in the hollow layer and inserted into the first steel bar trusses and / or the second steel bar trusses, and the first steel bar trusses and the second steel bar trusses are connected; on one hand, interlocking of the first steel bar truss and the second steel bar truss is achieved, and the bearing capacity and the fracture resistance in the on-site overall concrete pouring process are enhanced; and on the other hand, automatic flow line production is achieved, various walls with hollow layers can be conveniently combined according to needs, equipment is simple, a large overturning table is not needed as traditionally, and any mold table is not needed.

The utility model relates to a sinking courtyard stair structure which is fixed on an outer wall of a sinking courtyard and comprises a middle frame, stair plates and a platform plate. The middle frame is arranged on one side of the sinking courtyard outer wall in parallel, one sides of the platform plates are connected with the middle frame, the other sides of the platform plates are connected with the sinking courtyard outer wall, the platform plates are distributed on the two sides of the middle frame in a staggered mode, and the stair plates are fixed to the left side and the right side of the middle frame and distributed on the front side and the rear side of the middle frame in a crossed mode. The two ends of the stair plates are connected with the platform plates on the two sides of the middle frame respectively. Compared with the prior art, the utility model has the advantages of reasonable and safe acceptance system, simple structure, wide application range and the like.

This invention discloses a method for determining the safe distance for secondary lining construction of the pilot tunnel in small-clearance tunnel blasting excavation, which involves judging the stability of the surrounding rock deformation and deformation rate, and determining the safe allowable distance R. i Given the range of values, design an orthogonal test scheme for on-site vibration velocity monitoring, and calculate the safe distance R for each scheme. i First, based on the safe allowable distance Ri, monitoring points for blasting vibration velocity are set up, and on-site vibration monitoring is conducted. A unique K value and α value are obtained by fitting parameters such as the measured vibration velocity and explosive charge, and the calculated safe allowable distance R is then calculated. j Determine the conservative safety allowable distance R b Does it meet the requirements? If it does, then it is the final safe allowable distance R. z This scheme can determine the safe distance between the blasting source of the subsequent tunnel and the secondary lining of the preceding tunnel, thereby reducing the impact of vibrations generated by the blasting excavation of the subsequent tunnel on the secondary lining of the preceding tunnel.

The invention discloses a honeycomb sandwich structure infrared image defect detection method and system based on improved YOLOv5. The method comprises the following steps: collecting defect images of a honeycomb sandwich structure to form a sample data set; training defect images in the data set based on an improved YOLOv5 model, predicting positions and categories of honeycomb sandwich structure defects, training an optimization model by using a loss function until convergence, and obtaining and storing optimal model weight data; the improved YOLOv5 model is based on a YOLOv5 architecture, a Swin Transform module is embedded in a backbone network, and the detection performance of the model on honeycomb sandwich structure defects is improved in combination with a C3 convolutional layer, a CBS module and an SPPF module; and acquiring a defect image of the honeycomb sandwich structure to be detected, detecting and identifying the defect image by using the improved YOLOv5 model based on the optimal model weight data, and generating and outputting a detection result. According to the method, small-size defect identification in multi-scale defect identification can be effectively realized, and the defects of a traditional convolutional neural network in processing complex backgrounds and small target detection are overcome.

This invention relates to the field of building construction technology, specifically a support-free construction process for strip skylights. It utilizes guide rails laid out on the cantilevered slabs of the side beams of the skylight to construct a movable operating platform consisting of a steel truss, transverse support platforms, rollers, guardrails, and steel toe boards. Construction is completed through parameter calculation and prefabrication, guide rail installation and straightening, platform hoisting and debugging, segmented operations, and cyclical machine movement. The invention includes methods for calculating steel truss deflection, single-wheel pressure, anchor spacing, and cantilever slab bearing capacity. A stepped panel design can be used to adapt to transverse slope conditions. This invention eliminates the need for full-span vertical support, freeing up lower space, supporting parallel operations of multiple processes, shortening the construction period, reducing material input, and allowing for the reuse of core components. It is suitable for the construction of narrow, equal-span strip skylights with cantilevered slabs on the side beams.

The utility model belongs to the technical field of buildings, and particularly relates to a masonry tie bar embedded part anti-displacement fixing device which comprises an embedded steel plate, the embedded steel plate is located at the position, where a masonry tie bar is to be installed, of the back face of a main structure formwork, anchoring steel bars are arranged on the back face of the embedded steel plate, and holes are formed in the embedded steel plate. Nail bodies of the fixing nails penetrate through the holes in the embedded steel plate and the main body structure formwork, flat nail heads of the fixing nails are located on the back face of the embedded steel plate, and the nail bodies of the fixing nails are bent outside the main body structure formwork, so that the embedded steel plate is fixed, and the embedded steel plate is tightly attached to the main body structure formwork. The embedded steel plate is tightly attached to the formwork face plate, and the problems that due to displacement of the embedded part, the embedded part is immersed into concrete, and consequently concrete chiseling and welding construction of tie bars cannot be achieved in the later period are effectively solved. The formwork is simple in structure, easy and convenient to manufacture, high in construction speed and high in construction efficiency, large-area damage to the formwork can be avoided by adopting the fixing nails with relatively small diameters, and the service life of the formwork is prolonged.

The invention relates to the technical field of civil engineering, in particular to a steel sheet pile supporting device. The steel sheet pile supporting device comprises a pile plate body, an enclosing purlin assembly and a steel pipe support, and the pile plate body is fixedly connected with the enclosing purlin assembly through a hanging piece; the enclosing purlin assembly comprises a front plate, a rear plate and I-shaped steel, the front plate and the rear plate are connected through at least two sets of first bolts, and the length of the first bolts is larger than the distance between the front plate and the rear plate. The I-shaped steel is inserted between the front plate and the rear plate, and the number of the I-shaped steel is 2-3; the steel pipe support is a steel pipe, the steel pipe support is connected with the front plate, at least two sets of first stiffening ribs are arranged at the end of the side, close to the front plate, of the steel pipe support, and the steel pipe support is in threaded connection with the supporting piece through the first bolt holes. According to the supporting device, the assembling procedure is greatly simplified, the connection between the steel pipe support and the enclosing purlin assembly is firmer and more reliable, the load effect under the full working conditions of supporting tension, pressing and the like can be effectively resisted, and the overall stability and the bearing capacity of the supporting device are further improved.