40 results about "Ring road" patented technology

The invention relates to the field of intelligent transportation, and discloses an intelligent monitoring and management system and method for an expressway and electronic equipment, and the system collects global spatial-temporal data of the expressway to construct digital twins synchronized with the physical world; in the twinborn body, performing prediction and deduction based on a space-time causal map to identify potential risks; responding to the risk, generating an optimal intervention strategy through anti-fact deduction and executing the optimal intervention strategy, and recording a predicted intervention effect of the optimal intervention strategy; and after intervention, comparing a real traffic state with a prediction effect, calculating an anti-fact error, and carrying out dynamic self-correction on the space-time causal map according to the anti-fact error. According to the invention, links of perception, prediction, decision making, execution and feedback are fused into a self-adaptive control loop, and a self-correction mechanism based on an anti-fact error is introduced, so that the system can continuously learn and self-evolve from interaction with the physical world, and the problems of model solidification and poor adaptability of a traditional traffic management system are solved.

The invention discloses a multi-agent path planning method and related equipment, and relates to the technical field of artificial intelligence, and the method comprises the steps: responding to a multi-agent path planning instruction, determining a plurality of agents of a to-be-planned path, determining the priority of each agent of a current planning node, and based on the priority, determining the path of the current planning node; and determining a first grid map corresponding to the current planning node, and planning a grid where each multi-agent is located at the next planning node based on the one-way traffic constraint state of each loop in the first grid map and the priority. According to the method, the corresponding one-way passing constraint state of each loop in the current planning node is determined based on the priority, the motion direction of each agent in each loop corresponding to the current planning node is ensured to be uniform, then narrow channel conflicts are avoided, and the task completion efficiency of multiple agents is improved.

The application relates to the technical field of vehicles, in particular to a long-time-domain driving behavior decision method suitable for high-speed and loop traffic scenes, which comprises the following steps: acquiring a global planning path of a vehicle, a current motion state of the vehicle and current motion states of all surrounding vehicles in a region; generating an optimal driving behavior sequence of the vehicle according to the global planning path, the current motion state of the vehicle and the current motion states of all surrounding vehicles in the region; planning a driving track of the vehicle based on a first driving behavior of the optimal driving behavior sequence, and regenerating the optimal driving behavior sequence after the vehicle executes the first driving behavior based on the driving track, until the global planning path is completed. Therefore, the embodiment of the application can realize multi-step decision of driving behaviors such as lane-changing gap selection and lane-changing overtaking, has foresight, and simultaneously gives an optimal solution to long-time-domain driving behavior sequence planning based on feasibility discrimination, considers safety and high efficiency, and meets the needs of general driving.

Aspects of the disclosure provide for determining whether a vehicle is in a loop for an autonomous vehicle. For instance, a route from a current location of the vehicle to a destination for a trip may be generated. Locations traversed by the vehicle during the trip may be tracked. Locations of the route may be compared to the tracked locations to determine an overlap value. Whether the vehicle is in a loop may be determined based on the overlap value.

The utility model discloses a well ring reinforcing structure of a drainage system inspection well, which is characterized in that a well ring beam is arranged on a brick shaft and filled with C30 reinforced concrete, a well ring used for installing a well lid is arranged on the well ring beam through expansion bolts, and a gap between the well ring beam and an original concrete road layer is filled with concrete mixture. Leveling by using a ruler and a scraper blade; a plurality of notches are formed in the well ring, a plurality of protruding groove strips are arranged on the well lid and used for being clamped on the well ring, the well lid is prevented from rotating in the using process and fixed in the notches, leveling layers are adopted on the outer side of the well ring and the top of the well ring beam and used for leveling the road surface around the well lid, and a gasket is arranged at the bottom of the well ring. The well lid is flush with the surrounding road surface after being mounted; in the well ring pavement cutting and digging process, the periphery of the well ring is cut and dug into a whole hexagonal structure for construction, so that the installation and construction stress of the well ring beam, the well ring and the well lid is balanced, and the structural stability is ensured.

The invention discloses a coiled material hot melting paving device for ground construction, and relates to the technical field of building construction equipment, and the coiled material hot melting paving device comprises a driving mechanism and a paving mechanism; the paving mechanism comprises a main body box, a group of bearing main bodies, an electric telescopic frame and a fixed circuit loop; and a set of electric telescopic frames are fixedly mounted at the top of the main body box, and an air roller is rotationally connected between the interiors of the set of electric telescopic frames. When the coiled material is unfolded, a preheating plate and a combustor on the equipment are used for synchronously heating the back surface of the coiled material, so that the bottom of the waterproof coiled material is in a molten state, then the equipment is in a forward moving state, and pressure is directly applied by using rolling friction generated by a compaction roller and the dead weight of the equipment; air between the coiled material and a base layer is discharged through rolling of the pressing rollers, the coiled material and the base layer are firmly bonded, the edge pressing rollers on the two sides conduct directional compaction on the edge of the coiled material, edge warping or leakage is prevented, it is ensured that full-width bonding is uniform, and the efficient and stable paving process is achieved.

The invention provides a reservoir basin flood inverted siphon storage structure of a pumped storage power station, and relates to the technical field of water-power engineering pumped storage power stations, and the reservoir basin flood inverted siphon storage structure comprises an inlet control device which is connected with a reservoir surrounding highway interception and drainage ditch and comprises a flood storage water inlet and a trash rack, and the trash rack is arranged between a water and sediment diversion structure and an inverted siphon channel; the water-sediment diversion structure comprises a desilting basin communicated with the flood storage water inlet; the inverted siphon channel comprises a vertical shaft and an adit, the vertical shaft is connected with the desilting basin, the bottom end of the vertical shaft is connected with an inlet of the adit, and an outlet of the adit extends into the pumped storage basin. The problem that catchment water on the periphery of a traditional pumping storage basin can only be drained and cannot be utilized, and water source waste is caused is solved, considerable rainfall can be reasonably utilized, the water storage time is shortened, and evaporation leakage loss is supplemented.

The invention relates to a business district division method and system based on vector data and a graph theory, and belongs to the technical field of big data analysis. The business district division method based on the vector data and the graph theory comprises the steps that urban road network data and POI data in a vector format are loaded, the urban road network information is preprocessed, and the POI data comprise geographic coordinates and classification information; traversing the preprocessed urban road network data so as to convert the geographic road network graph into a road network topological graph according to the traversed node set, the traversed edge set and the connection relation of the traversed node set and the traversed edge set; traversing each edge in the road network topological graph to identify a minimum closed loop enclosed by the edges as a business district; and performing spatial matching on points of interest POIs in the point of interest POI data and the business districts to determine which business district each point of interest POI belongs to. By constructing a road network topological graph, a high-consumption image conversion and processing process is completely avoided, and efficient operation can be realized on common hardware.

This invention relates to the field of template joint reinforcement technology, and more particularly to a template joint reinforcement device for underground ring road construction. The device includes multiple templates, a sealing component, a reinforcement component, and a support component. The sealing component includes insert iron plates installed between the multiple templates. These insert iron plates are used to grind the sidewalls of the templates and fill the gaps between them. One end of each insert iron plate is fixedly fitted with a reinforcement iron plate to prevent cement leakage, and the reinforcement iron plate and the insert iron plate form a T-shape. This invention, by installing insert iron plates between the templates, grinds the splicing surfaces between the templates, making the mating surfaces smoother and improving the splicing effect. The reinforcement iron plates prevent cement leakage from the splicing joints, and the sealant and sealing strips further enhance the sealing effect of the templates. The interaction between the components reinforces the position of the templates layer by layer, improving their stability. This eliminates the need for additional bolts or other components, saving engineering materials.

The application provides a kind of multi-path arterial signal coordination control method considering speed fluctuation, comprising first collecting traffic data, including road network geometry data, traffic flow data and signal control data, determine a plurality of main paths according to traffic flow data.Then based on the driving speed of each vehicle on each main path, the average speed and speed fluctuation of the vehicle on each main path are calculated.Finally, a signal control optimization model is constructed: the maximum weighted green wave bandwidth of all paths is taken as the target, the objective function is constructed, and loop integer constraint, interference constraint, speed fluctuation space-time constraint, maximum speed fluctuation constraint and minimum speed fluctuation constraint are added, the signal control optimization model is solved, the optimized signal cycle and green wave bandwidth are obtained, and the optimized signal timing strategy is output.The signal timing generated by the method has good prospects in reducing travel delay and parking frequency, and can achieve better multi-path coordination effect.

The invention discloses a method for establishing an independent coordinate system of segmented projection engineering of an annular road, and relates to the technical field of road management.The method comprises the steps that firstly, on the basis that a coordinate system of a user-defined central meridian and an elevation compensation plane is established, segmentation operation and projection plane setting operation are conducted on the annular road, and a road section corresponding to the annular road is obtained; secondly, obtaining a segmentation weight coefficient corresponding to each road section in the annular road, and obtaining a Lagrange multiplier according to all the segmentation weight coefficients; then obtaining a terrain curvature correction factor corresponding to each road section in the annular road, and obtaining a comprehensive allocation weight according to the terrain curvature correction factors and the segmentation weight coefficients; and finally, on the basis of the comprehensive distribution weight, obtaining the coordinate correction value of the control point of each road section, and revising the control point of each road section according to the coordinate correction value of the control point of each road section, so that the problem of cracks existing in the annular road constructed in the prior art can be effectively solved.

The invention discloses an ultra-efficient energy-saving road and method for reducing air resistance of vehicles, trains, ships and the like to be close to zero. According to the principle that a ball and air pushed by the ball run at a high speed in the same system and in the same direction almost without friction in a sealed ring, a channel is divided into a left channel 1 and a right channel 3 which are closed, the left channel 1 and the right channel 3 are connected end to end to form a long-strip-shaped ring channel, and the connecting positions of channel bodies are communicated. High-pressure gas in front of a vehicle and a ship on the left road 1 can be directly pressed into and sucked into the right road 3, particularly sucked into a negative-pressure area behind the vehicle and the ship on the right road 3, and vice versa, so that the high-pressure gas at the head of the vehicle and the ship can automatically pass through the opposite side road to reach a low-pressure area at the tail of the vehicle and the ship, the air resistance is close to zero, the same system circulation in the shortest distance is realized, and the service life of the vehicle and the ship is prolonged. The head channel opening and the tail channel opening of the channel are open, and air cannot flow out. The defects that when vehicles, ships and the like run, air in the places where the vehicles and the ships arrive is pushed to be scattered to the outside, the tails are pulled by negative pressure, and a huge amount of energy is wasted are overcome, and therefore the huge amount of energy is saved.

The invention discloses an unpowered carbon dioxide spiral loop heat pipe shallow geothermal road snow melting system which comprises a carbon dioxide spiral loop heat pipe arranged below a road surface, and the carbon dioxide spiral loop heat pipe comprises a spiral pipe evaporation section, an ascending air pipe, a descending liquid pipe, a multi-U-shaped pipe condensation section and a backflow suppressor which are communicated with one another; the spiral pipe evaporation section, the ascending air pipe, the descending liquid pipe and the backflow suppressor are vertically buried in a drill hole of a rock-soil body below a roadbed, and the multi-U-shaped pipe condensation section is horizontally buried in the roadbed. A spiral pipe evaporation section of the system absorbs terrestrial heat and vaporizes a working medium, an ascending gas pipe penetrates through a variable temperature layer to convey a gas phase to a multi-U-shaped pipe condensation section located below a pavement structure layer, and the working medium releases heat to the pavement and condenses; and the condensate flows to the reflux suppressor through the down liquid pipe and then returns to the evaporation section of the spiral pipe to form closed circulation. The whole system is compact in structure, high in heat transfer efficiency, flexible in arrangement and suitable for freezing prevention and snow melting of complex scenes such as ramps, sidewalks and bridge floors.

The application discloses a kind of anti-leakage circulating fans in ring road type high-pressure gas flow calibration device, magnetic coupling shaft coupling includes outer rotor, inner rotor, high-pressure isolation cover and first flange plate;The end of outer rotor is provided with accommodating groove, the end of inner rotor is placed in the accommodating groove of outer rotor, and the inner wall of accommodating groove and the outer periphery of inner rotor are respectively circumferentially evenly provided with multiple N-pole and S-pole interval arrangement magnet, so that the number of magnet on outer rotor and inner rotor is equal, and the magnetic pole is opposite at diametral opposite position;High-pressure isolation cover is the thin-walled shell with closed top, is placed between outer rotor and inner rotor, and does not contact with outer rotor and inner rotor.This application changes transmission form and sealing form, not only significantly improves the safety of system, but also effectively reduces maintenance difficulty and cost, improves work efficiency, and has important significance for promoting the development of clean energy technology.

The invention provides a subtropical city charging station layout optimization method and system based on climate adaptive clustering, and belongs to the technical field of city charging infrastructure planning. The problems that in existing planning, climate adaptability is insufficient, analysis of a driving mechanism is not accurate, and strategy pertinence is not high are solved. The method comprises the following steps: collecting data of a city-surrounding high-speed enclosed area of a subtropical city, and constructing an equal-area hexagonal grid with the side length of 1000m after data cleaning and coordinate conversion; a kernel density estimation method is adopted to analyze the aggregation degree of the charging stations, and adaptive features are obtained in combination with a climate adaptive DBSCAN clustering algorithm; constructing a multi-scale geographically weighted regression model by taking the density of the charging station as a dependent variable, and quantifying the influence of spatial heterogeneity; and according to clustering and regression results, providing a charging station layout scheme from driving factor guidance, a climate adaptive hierarchical strategy and a climate adaptation dimension. The method is mainly used in the subtropical city charging network construction field.

The application relates to the field of intelligent transportation, and discloses an expressway intelligent monitoring and management system, method and electronic equipment. The system collects expressway global space-time data to construct a digital twin body synchronized with the physical world. In the twin body, potential risks are identified through prediction and deduction based on a space-time causal graph. In response to the risks, an optimal intervention strategy is generated through counterfactual deduction and executed, and the prediction intervention effect is recorded. After the intervention, the real traffic state and the prediction effect are compared, the counterfactual error is calculated, and the space-time causal graph is dynamically self-corrected accordingly. The application integrates perception, prediction, decision-making, execution and feedback into an adaptive control loop, introduces a self-correction mechanism based on counterfactual error, enables the system to continuously learn and evolve from interaction with the physical world, and solves the problems of model solidification and poor adaptability of traditional traffic management systems.

The invention relates to the technical field of bus protection, and provides a bus operation state identification method and a brake coefficient identification method and system based on bus correlation, and the method comprises the steps: determining a bus correlation matrix according to the connection state of a circuit breaker and a disconnecting link in a bus topological structure; determining the correlation between the sections of buses by using the correlation coefficient of each section of bus and each interval in the bus correlation matrix, and constructing a bus correlation coefficient matrix; performing path search by using the bus correlation coefficient matrix, and identifying the running state of each section of bus; if no correlation exists between one bus section and other bus sections, the bus section is in split operation; if the correlation between the bus sections forms a loop, the bus sections forming the loop are all in closed-loop operation; and if the bus sections have correlation but do not form a loop, the bus sections which do not form the loop run in parallel. The method is simple in calculation process and can quickly judge the running state of each section of bus.

The present application relates to a kind of mixed vehicle space domain deep reinforcement learning collaborative control method for mountain ring road scene, belong to intelligent network connection traffic technical field, including the following steps: S1: establishing mountain ring road mixed vehicle fleet scene and coordinate system;Vehicle time domain horizontal and longitudinal coupling dynamics are constructed and equivalent control input is introduced, arc length variable is introduced and time inverse function is defined, and horizontal and longitudinal coupling dynamics model in space domain is constructed;S2: the slope and its confidence are calculated;The HDV trajectory of pilot vehicle is predicted;Space domain delay collaborative error is constructed;S3: space domain PPO controller is constructed, and comprehensive reward function is defined, and horizontal and longitudinal joint control action is output;S4: multiple constraint fusion compensation and action saturation projection execution are carried out.

The invention relates to the technical field of image processing, and provides a flyover crossing road disease identification method and system based on unmanned aerial vehicle inspection, and the method comprises the steps: collecting flyover crossing road images at a plurality of moments; obtaining a plurality of road edge sections, and screening a plurality of suspected annular road sections; obtaining a plurality of continuous road edges to obtain a plurality of suspected annular road edges; longitudinal coordinate changes of two adjacent road edge sections in the suspected annular road edge in the flyover crossing road image are analyzed, and the initial three-dimensional degree of each suspected annular road edge in the flyover crossing road image is obtained; correcting to obtain a corrected three-dimensional degree of each suspected annular road edge; and constructing a disease identification model based on the flyover crossing road image, constructing an attention mechanism in combination with the correction three-dimensional degree of the suspected annular road edge, and learning three-dimensional information of the model to realize disease identification of the flyover crossing road. The invention aims to solve the problem of three-dimensional information loss of the cross road under aerial photography of the unmanned aerial vehicle.

Aspects of the disclosure provide for determining whether a vehicle is in a loop for an autonomous vehicle. For instance, a route from a current location of the vehicle to a destination for a trip may be generated. Locations traversed by the vehicle during the trip may be tracked. Locations of the route may be compared to the tracked locations to determine an overlap value. Whether the vehicle is in a loop may be determined based on the overlap value.

The invention provides a four-in-one system for a mountain and hill orchard and a construction method of the four-in-one system, relates to the crossing field of agricultural engineering and fruit tree cultivation technologies, and solves the technical problems that functions of existing orchard infrastructures are split, and mechanical passing and underground environment optimization cannot be considered at the same time. The system comprises an underground three-dimensional pipe network unit, an oxygen supply unit, a rainwater recycling unit and a ground mechanical passing unit, the underground three-dimensional pipe network unit comprises multiple layers of pipelines, and all the layers of pipelines are communicated with one another; the oxygen supply unit comprises an air inlet pipe array and an exhaust pipe array; the rainwater recycling unit is arranged at the lowest part of the park and is communicated with the pipeline at the lowest layer; the ground mechanical passing unit comprises a garden surrounding path surrounding the periphery of the garden and a high-clearance shed frame, and the inner side of the garden surrounding path is connected with the end of each planting row. By the adoption of the structure, the four functions of moisture removal, oxygen supply, rainwater recycling and mechanical passing are integrated and coordinated, and the problems of waterlogging, oxygen deficit, water resource waste and low mechanization level of southern hilly orchards are effectively solved.

The present disclosure relates to the field of map construction technology and discloses a method, device and medium for determining whether a path in a map is passable. The method comprises the following steps: categorizing multiple paths in a map according to the number of driving directions possessed by the paths; and determining, for any path in the same category, whether any path forms a closed loop after being spliced ​​with at least one other path in the same category. A closed loop is a loop consisting of paths traversed in the process of traveling from a driving starting point in a clockwise or counterclockwise direction and then returning to the driving starting point. If any path forms a closed loop after being spliced ​​with at least one other path in the same category, the path is determined to be passable. In the above scheme, paths are classified into one-way paths and two-way paths, and on this basis, the method of separately verifying whether each path is passable through a closed loop is simple and efficient, thereby improving the efficiency of verifying the rationality of the path.

A method for identifying closed loops to be merged in OSM urban road data comprises the following steps: converting OSM urban road data within a specified area into graph data; identifying polylines to be merged by calculating the angle between any two polylines at a node; calculating the number of intersecting polylines at all nodes on the polylines to be merged to identify breakpoints; identifying connecting paths between breakpoints using a breadth-first algorithm; calculating the circularity of the shortest polygon belonging to the connecting path to screen polylines for repairing the loop; adding available polylines to the combination of polylines to be merged; for repeated available polylines, rechecking whether the nodes of all polylines in the same group have breakpoints; and outputting a combination of all connecting paths on the closed loop. The present invention can compensate for the problem of missing sections caused by the inability to accurately identify all lanes when merging all lanes of the same section in OSM road data, thereby improving the efficiency of using OSM road data for studying the morphological characteristics of urban road networks and saving a large amount of mechanical labor time.

The present invention discloses a superposed layout, an exhibition hall building system with a double-ring traffic and a construction method. The system includes three building main bodies arranged in a triangular pyramid shape. There is an annular atrium structure in the center of the three building main bodies, and an inner ring road is formed between the annular atrium structure and the building main bodies; two adjacent building main bodies are connected by a corridor, and a passageway is provided at the bottom of the corridor; an outer ring road is provided outside the three building main bodies, and the passageway connects the inner ring road and the outer ring road; a sector-shaped roof is slidably arranged on the top of the building main body, and the three sector-shaped roofs can cover the annular atrium structure; the method includes the construction of the building main body, the construction of the corridor and the installation of the sector-shaped roof. The system integrates the building structure and the traffic road, with a simple layout, effectively solving the complex traffic problems of multiple buildings. The installed roof adopts a cantilever and hidden structure, with a beautiful and grand overall structure, not easily corroded by rainwater, and a long service life. The method is simple and efficient, with a short construction period.

The application discloses a kind of urban rail transit system vehicle configuration digital modeling system and method, it is related to rail transit engineering technical field, including the following steps: S100, establish the global level baseline of vehicle configuration, generate unique topological fingerprint to each node in configuration level, and build the corresponding relationship of topological fingerprint and time anchor point in combination with node creation time, form the level signature library for abnormal structure comparison.The application realizes accurate identification and isolation to configuration loop by topological fingerprint identification, level signature verification, differential comparison and sandbox verification, and dynamically optimizes structure import order in combination with risk score and self-healing control, significantly improves the accuracy, controllability and system robustness of rail transit vehicle configuration data, and provides reliable support for cross-car type operation and maintenance.

The present invention discloses a method for fitting the linear shape of a high-speed ring road based on random sampling of point clouds, relating to the field of ring road repair technology. The method comprises the following steps: S1 pre-processing the original point cloud to obtain a road surface point cloud; S2 using Alphashapes to perform boundary detection on the road surface point cloud by dividing it into sections to obtain a boundary point cloud; S3 fitting the boundary of a circular curve and determining the center of the circle on the boundary point cloud based on the consistency of random sampling, and fitting the boundary of a straight line segment on the boundary point cloud based on the consistency of random sampling to determine the site boundary size; S4 inferring the length of the site transition curve and the straight line length of the site based on the site boundary size and the position of the circular curve. The present invention realizes that extracting the linear shape of a ring road using LiDAR point cloud data can significantly improve measurement accuracy and efficiency, and enhance the degree of automation.

The utility model discloses a measuring and setting-out device for high-speed loop construction in an automobile test field, and relates to the technical field of measuring tools. Comprising a mounting flat plate, moving wheels are arranged at the bottom of the mounting flat plate, a push-pull handle is arranged on one side of the upper surface of the mounting flat plate, and the upper surface of the mounting flat plate is used for placing a prism matched with a total station; the rapid marking mechanism is arranged on the upper surface of the mounting flat plate, is located under the prism and is used for marking point positions under the prism through the rapid marking mechanism after the pile points are determined through cooperation of the prism and the total station; and the marking point punching mechanism is arranged on the upper surface of the mounting flat plate. According to the rapid marking mechanism, paint can be rapidly sprayed for point position marking after a survey lofting point position is determined, then drilling is conducted on the lofting point position through the marking point position punching mechanism, piling is conducted in a drilled hole in an auxiliary mode through the adapter, the work pressure of manual piling is relieved, and the work efficiency of survey lofting is overall improved.

The invention discloses a vector algebraic operation-based segmented bus voltage phase difference rapid measurement method and device. The method comprises the following steps of: synchronously acquiring three-phase voltage data on two sides of a grid-connected point; converting the voltage data under the three-phase static coordinate system into voltage data under a two-phase static coordinate system; judging a phase difference range through a trigonometric function value, implementing specific rotation transformation on a voltage vector on one side according to the phase difference range, and equivalently mapping the phase difference to an acute angle range of 0-45 degrees; and finally, calculating the phase difference after rotation and compensating the rotation transformation angle, and obtaining the phase difference of the voltages on the two sides of the grid-connected point after reduction. The phase difference is calculated by adopting a pure algebraic method, tracking delay, loop filtering influence and potential lock losing risk introduced by a traditional phase-locked loop are thoroughly avoided, the phase difference calculation speed and precision are effectively improved, the method can be integrated to a new energy power generation equipment grid-connected control system, and the synchronous grid-connected speed, reliability and adaptability are greatly improved.

A connecting structure of a main hole and an branch hole of a circular road comprises the main hole of the circular road, the branch hole, a connecting notch formed in the wall of the main hole of the circular road, a transition section and an anti-seepage layer, a branch hole expansion face is arranged at the connecting end of the branch hole, the structure of the branch hole expansion face is the same as that of the wall of the branch hole, and the branch hole expansion face corresponds to the connecting notch of the main hole of the circular road. One end of the transition section is inserted into the connecting notch, the end face of the end of the transition section makes contact with the waterproof layer of the connecting notch, the outer wall of the transition section makes contact with the civil air defense reinforced concrete lining layer of the connecting notch, and the other end of the transition section extends towards the branch hole expansion face. And the anti-seepage water layer is arranged on the outer side of the transition section and covers the adit expansion surface and the transition section. The structure is simple, construction is convenient, the phenomenon of water seepage between the main hole and the branch hole of the circular road can be effectively eradicated, and structural safety of the circular road is guaranteed.