43 results about "Ski resort" patented technology

The invention provides a snowfield path planning method and system for a ski field transport vehicle, and relates to the technical field of vehicle navigation, and the method comprises the steps: obtaining a departure coordinate and a destination coordinate of a to-be-planned path; generating a basic path based on the starting point coordinates and the destination coordinates according to a basic terrain model of the ski field; acquiring topographic information and accumulated snow information of the basic path approach area; according to the terrain information and the accumulated snow information, obtaining a prohibited area in which a ski field transport vehicle cannot pass; and adjusting the basic path according to the prohibited area to obtain an actual planned path. According to the method, the influence of accumulated snow on normal driving of the ski field transport vehicle can be obtained according to the accumulated snow condition of each area in the ski field obtained in real time, so that a reasonable and safe driving path is planned for the driving of the ski field transport vehicle on the snowfield in the ski field.

The invention relates to the technical field of outdoor advertisement effect evaluation, in particular to a ski field outdoor advertisement monitoring data analysis method and system.The method comprises the steps that multi-source monitoring data of ski field outdoor advertisement positions are collected, and the multi-source monitoring data comprise advertisement position video streams, environment sensing data and skier behavior tracks; based on the environment sensing data, executing dynamic environment interference correction on the advertisement position video stream, and generating an advertisement exposure image sequence; according to the advertisement exposure image sequence and the skier behavior track, constructing a dynamic space-time correlation between the skier and an advertisement position, and extracting an advertisement attention feature set; and inputting the advertisement attention feature set into an advertisement effect evaluation model to generate an advertisement effect quantitative index. According to the invention, the problem of advertisement attention quantification misalignment in the high-speed motion scene of the ski field is effectively solved.

The present invention belongs to the technical field of polymer composite material preparation and discloses a double-layer hollow structure photonic gel film with controllable water permeation and color change, as well as its preparation method and application. The method comprises the following steps: preparing a three-dimensional PS-SiO2 photonic crystal and a three-dimensional SiO2 photonic crystal; calcining the three-dimensional PS-SiO2 photonic crystal at high temperature, filling the crystal with a polymer, and curing the crystal with ultraviolet light to obtain a hollow SiO2 structural color gel; curing the three-dimensional SiO2 photonic crystal with a polymer, and then etching the crystal with hydrofluoric acid to obtain an inverse opal gel; and bonding the hollow SiO2 structural color gel and the inverse opal gel to form a double-layer hollow structure photonic gel film with controllable water permeation and color change. The photonic gel film can be used in snowmelt warning indicators at large ski resorts, portable alcohol solubility detectors, or anti-counterfeiting identification labels for small commercial packaging.

A ski resort management system comprising: a data acquisition system that receives data from telemetry systems of the lift systems, of the snow generators and of the snow groomers of the ski resort; a processing station; mass storage units, containing a system database fed by the data acquisition system; and a display interface, accessible from operator terminals. The data acquisition system stores data and signals from the lift systems, the snow generators and the snow groomers in the system database. The processing station enables setting a mode of the display interface for alternatively displaying data relative to each lift system, to each snow generator or to each snow groomer, or to display, in an aggregated form, data relative to all the lift systems, all the snow generators and all the snow groomers.

The utility model discloses an indoor ski field pipeline penetrating heat preservation and cold bridge prevention structure which comprises a heat preservation plate, a pipeline and a first heat preservation layer. The insulation board is a metal rock wool sandwich board, the pipeline penetrates through the insulation board, and a first insulation layer is arranged between the pipeline and the insulation board; the pipeline comprises a first pipeline, and when the first pipeline is a fire fighting pipeline or an air conditioner pipeline, the anti-cold-bridge structure further comprises a second heat preservation layer, a third heat preservation layer, an air isolation layer, a first fixing device and a first protection pipe. The first pipeline is sleeved with the first protection pipe, and the space between the first pipeline and the first protection pipe is filled with a second heat preservation layer; the joint of the side, facing the outdoor space, of the first pipeline and the heat preservation plate is coated with an air isolation layer. Heat transfer between the interior of the snow field and the structural layer can be efficiently isolated, the temperature of the structural layer and the temperature of the bottom of the snow layer are stabilized with extremely low heat supplement, extra energy consumption is greatly reduced, and the service life is prolonged.

The utility model relates to the technical field of constructional engineering, in particular to a slope obstacle setting device for a ski field, which comprises a door-shaped frame mounted on a snowfield transport vehicle, a transport mechanism for transporting building materials to set up slope obstacles is mounted on the door-shaped frame, and a lifting component for lifting the transport mechanism is mounted on the door-shaped frame. Building materials are placed in the U-shaped frame, the screw rod is driven by the lifting motor to rotate, and then the threaded pressing plate is driven to move downwards to press the building materials in the U-shaped frame, so that the situation that the building materials fall off is avoided, the building materials can be conveyed in cooperation with a snowfield transport vehicle, the transport efficiency is improved, and the transport cost is reduced; the extension sliding plates are pulled out of the storage sliding grooves in the U-shaped frame, the U-shaped frame can be extended, long steel pipes or steel plates and other building materials can be transported more conveniently, and the transportation adaptability of the device is improved.

A snowfield passenger flow statistical method based on deep learning relates to the technical field of crowd flow statistics in dense areas such as snowfields, and comprises the following steps: segmenting an image into different areas according to the difference of crowd density in the image, adopting a multi-branch structure, and carrying out crowd counting on the corresponding density area by each branch; for an area with relatively low density, accurate counting of the area can be realized if multi-scale information is extracted; a branch model aiming at low density is designed, the core of the branch model is that the receptive field range of neurons is expanded by using expansion convolution, and meanwhile, multi-scale information is obtained through aggregation by using Dense connection, so that accurate estimation of a multi-scale head is realized; for a high-density area, a branch model which is based on Transform and aims at high density is provided. According to the invention, the final density map is obtained by selecting the most suitable branch result for each area according to the local density information of the density map generated by double branches, so that high-accuracy counting is obtained.

This utility model belongs to the field of storage device technology, specifically relating to a device and system for collecting leaked ethylene glycol aqueous solution. It includes a collection tank body, a water inlet, a solenoid valve, a vent, a level gauge, a signal terminal, a drain outlet, a detection port, a controller, and a collection tank base. The water inlet is located on the top left side of the collection tank body via a straight pipe, the signal terminal is installed on the top right side of the collection tank body, and the drain outlet is located at the bottom of the collection tank body via a straight pipe. This utility model, through the coordinated design of the collection tank body, solenoid valve, level gauge, and controller, achieves automatic collection and alarm control of leaked ethylene glycol aqueous solution. When the liquid level reaches the alarm threshold, the controller automatically closes the solenoid valve at the water inlet and sends a signal to prevent the leaked liquid from continuing to spread. Simultaneously, manual collection is achieved through the drain outlet, effectively preventing the slightly toxic ethylene glycol aqueous solution from harming people and the environment, and significantly improving the safety of indoor ski resort air conditioning systems.

A ski resort management system comprising: a data acquisition system (52) receiving data from the telemetry systems (15, 26, 43) of the ski lift systems (2), snow generators (20), and snow groomers (7) of the ski resort (1); a processing station (73); mass storage units (58, 59) containing a system database (60) fed by the data acquisition system (52); and a display interface (75), accessible from operator terminals (76). The data acquisition system (52) stores data and signals from the ski lift systems (2), snow generators (20), and snow groomers (7) in the system database (60).The processing station (73) allows configuring a display interface mode (75) to alternately display data relating to each lift system (2), each snow generator (20) or each snow groomer (7), or to display, in aggregate form, data relating to all lift systems (2), all snow generators (20) and all snow groomers (7).

This invention relates to the field of indoor ski resort construction and discloses a method for fixing wheeled construction machinery on indoor ski resort slopes. The method includes the following steps: S1, designing a support device, comprehensively considering the inclination angle of the concrete slope of the ski slope, the load of external machinery on the support device, and indoor environmental factors. A preliminary model and material selection for the expected support device are determined using finite element software and Tekla software. S2, arranging the construction positions based on the BIM model of the entire construction site. S3, processing and transportation devices. S4, fixing the device base. S5, installing and fixing the machinery. The support device is assembled by welding channel steel, and the base installation and chemical bolt configuration are precisely determined. Track connecting pieces and wheel stop positioning devices accurately secure the machinery, ensuring the stability and safety of the support device and machinery during construction, distributing the load, preventing displacement and slippage, improving construction quality, reducing the possibility of accidents, and achieving the effect of ensuring construction safety and flexibility.

The invention discloses a northeast ski field accumulated snow depth inversion method based on optimal feature screening and a constraint stacking neural network, and belongs to the technical field of satellite remote sensing image processing and accumulated snow parameter inversion. According to the method, sentry No.1 SAR data is taken as a core data source, multi-source auxiliary data such as weather station snow depth data, atmosphere reanalysis data, geographic information data, vegetation feature data and time data are fused, and an accumulated snow depth inversion initial feature set is constructed; according to the method, an optimal feature combination highly related to the snow depth is screened out by introducing a Spearman correlation coefficient-based feature screening method (FSSCC), and an integrated learning algorithm cNN-Stacking is constructed on this basis, so that adaptive weighted fusion of inversion results of various basic models is realized, and the snow depth inversion precision and stability are improved. An empirical model is adopted in the ski field ski track area, space fusion is conducted on the empirical model and the inversion result of the natural snow area, and accumulated snow depth distribution covering the whole ski field area with the spatial resolution being 20 m is obtained.

This invention discloses a ski resort rescue and transport robot with leveling adjustment function, belonging to the field of rescue robot technology. The aim is to propose a ski resort rescue and transport robot with leveling adjustment function to solve the problems of low transfer efficiency, inability to adapt to sloping road conditions, insufficient shock absorption and cushioning effect, and the risk of secondary injury in existing technologies. The invention includes: a moving unit; a shock-absorbing and balancing unit disposed on the moving unit, the shock-absorbing and balancing unit including at least a stretcher tray, a shock-absorbing mechanism, and a balancing mechanism, which adjusts the forward and backward tilt of the stretcher tray and provides shock absorption; a stretcher; and a stretcher fixing unit, which drags the stretcher to the stretcher tray and fixes it in place. This invention reduces road bumps and lowers the risk of secondary injury through the shock-absorbing mechanism; and adapts to changes in terrain slope through the balancing mechanism, maintaining horizontal transport of the injured person.

The invention relates to the technical field of building construction, in particular to a joint structure for connecting a steel pipe column and an inclined plane concrete structure and a construction method, and the joint structure comprises a vertically arranged steel pipe concrete column, and an upper inclined beam and a lower inclined beam which are obliquely arranged relative to the steel pipe concrete column; annular concrete corbels and annular steel corbels are arranged at the joints of the upper oblique beam and the concrete filled steel tubular column and the joints of the lower oblique beam and the concrete filled steel tubular column. The annular steel corbels are arranged on the lower portions of the interiors of the annular concrete corbels. The upper oblique beam comprises a main reinforcement c, a main reinforcement d and a stirrup b, and the main reinforcement c and the main reinforcement d are connected through the stirrup b; the lower oblique beam comprises a main reinforcement a, a main reinforcement b and a stirrup b, and the main reinforcement a and the main reinforcement b are connected through the stirrup b; the main reinforcement c and the main reinforcement d are respectively bent downwards or upwards for 15 days to be anchored into the annular concrete bracket, and the main reinforcement a is bent downwards for 15 days to be anchored into the annular concrete bracket. The overall stability and safety of similar building structures such as an indoor ski field can be effectively improved.

This invention discloses an automatic parking control method and transport vehicle for ski resorts based on IoT sensing, belonging to the field of IoT control technology. By acquiring various IoT sensor information, this invention can comprehensively understand the surrounding environment of the ski resort transport vehicle. The fusion of ultrasonic, geomagnetic, visual, and lidar sensor information can accurately reflect the vehicle's status. An intelligent driving control processing algorithm is used to determine the initial vehicle environmental state vector, providing an accurate basis for subsequent decisions. Determining the parking path planning label helps to assess the risk of path intersection with the control strategy in advance. Based on this label, the decision to issue an automatic parking control strategy can be made, improving parking safety and efficiency, avoiding unnecessary collision risks, optimizing parking lot resource utilization, and adapting to the complex and ever-changing parking needs of ski resorts.

The embodiment of the invention discloses a ski field automatic parking control method based on Internet of Things sensing and a transport vehicle, and belongs to the technical field of Internet of Things control. According to the embodiment of the invention, the surrounding environment of the ski field transport vehicle can be comprehensively mastered by acquiring various kinds of Internet of Things sensing information, and the fusion of the ultrasonic sensing information, the geomagnetic sensing information, the visual sensing information and the laser radar sensing information can accurately reflect the vehicle state. An initial vehicle environment state vector is determined by using an intelligent driving control processing algorithm, and an accurate basis is provided for subsequent decision making. The determination of the parking path planning label helps to evaluate the risk of intersection with the control strategy path in advance, and determines whether to issue the automatic parking control strategy according to the label, thereby improving the parking safety and efficiency, avoiding the unnecessary collision risk, optimizing the resource utilization of the parking lot, and meeting the complex and variable parking demands of the ski field.

To provide a piste operation method in ski resorts allowing users to enjoy once again after skiing a piste including a jump ramp, and a piste operation system.SOLUTION: A piste operation method in ski resorts comprises: a user action video capturing step of using an installed imaging device installed at a ski resort to capture user action video including an aerial action after a user jumps from a jump ramp of a piste; a composite video creation step of using a composite video creation device to combine the user action video and user perspective video captured by a portable imaging device worn by a user while the user is skiing the piste and creating composite video; and a composite video distribution step of using a composite video distribution device to distribute the composite video to at least one of a display device installed in a public space and a user terminal of the user .SELECTED DRAWING: Figure 7

1. Computer-aided method for operating at least one snow groomer in a ski resort and computer-aided system for carrying out the method 2.1 Such a method for operating at least one snow groomer for one work operation per unit of time in a ski resort that is topographically recorded, wherein position and driving data of the at least one snow groomer are recorded in a time-dependent manner during a driving operation of the snow groomer, is known. 2.2 According to the invention, the fill level of an energy storage device for the drive system of the snow groomer is recorded at the beginning of the work operation, an average energy consumption of the snow groomer per planned unit of time is stored depending on the respective work operation, and depending on the fill level of the energy storage device and depending on the stored energy consumption per planned unit of time, a driving route for the snow groomer is specified for a time-dependent work operation. 2.3 Use of snow groomers in ski resorts

The invention relates to the technical field of meteorological early warning, in particular to a skiing field real-time meteorological service early warning method and system, and the method comprises the steps: constructing a skiing field real-time information set; performing terrain deformation compensation based on the real-time information set of the ski field and the spatial topological relation of the functional areas of the ski track, and constructing a dynamic coupling field; defining a ski field risk rule base, inputting the dynamic coupling field into the ski field risk rule base, and executing weight distribution; performing tensor analysis on the risk rule output after weight distribution, detecting a three-field coupling abrupt change interface, and generating a grading early warning instruction; and extracting an equipment control parameter set mapped with the space coordinates of the execution terminal from a ski field risk rule base according to the geo-fence identifier in the graded early warning instruction. According to the invention, systematic misjudgment caused by meteorological risk judgment of a ski field and topographic spatial feature decoupling is effectively solved, and accurate meteorological disaster early warning of a key area is realized through dynamic coupling field construction and geofence mapping of meteorological parameters.

1. The name of this design product: Granular Dry Snow. 2. Purpose of this design product: This design product is used for making snow pellets in ski resorts. 3. The key point of the design of this product lies in its shape. 4. The picture or photo that best illustrates the key points of the design: Design 1 3D drawing. 5. Designate Design 1 as the base design.

This invention relates to the field of ski turf, specifically to an impact-resistant and crack-resistant ski turf and its preparation method, which addresses the problems of high cost, large investment, poor impact resistance, and low tear strength of existing indoor ski turf. This ski turf uses polypropylene blended with epoxy resin containing flexible side chains as artificial grass fibers, and incorporates -B-O- bonds into EPDM rubber as a rubber buffer layer, jointly improving the impact resistance and tear strength of the ski turf. This ski turf is suitable for indoor low-temperature use; the composite polypropylene used as artificial grass fibers exhibits higher impact resistance at low temperatures than ordinary polypropylene, making it better suited for ski resorts. Furthermore, polypropylene is low in cost, reducing the overall cost of artificial ski turf.

This invention relates to the fields of computer vision and video analysis technology, and discloses a multimodal feature fusion and clustering method and system for ski videos. It aims to solve the problems of low accuracy and poor efficiency in existing ski resort video retrieval schemes under complex scenarios with strong occlusion, high clothing similarity, and motion blur. This invention first extracts the skier's appearance features, motion features, and equipment semantic features from captured ski video clips. After projecting these three types of features onto a unified dimension, the fusion weights of each feature are adaptively adjusted based on the skier's movement speed to obtain a fused feature vector. Then, a time decay weight is introduced to adjust feature similarity, and a density clustering algorithm is used to aggregate video clips of the same skier. Simultaneously, model parameters are optimized through user feedback. This invention significantly improves the accuracy and efficiency of ski video retrieval and is suitable for ski resort video retrieval and operation service scenarios.

This invention relates to the field of image processing technology and provides a method for analyzing the safety status of ski resort drone images based on image processing. The method includes: capturing ski resort images using a drone camera; constructing a dataset using image data augmentation techniques; improving the YOLOv11 model to obtain the YOLO-ROSP model by introducing a selective kernel attention mechanism and designing a lightweight convolutional module based on channel shuffling-single aggregation to construct a lightweight multi-scale feature transformation architecture; training and validating the model, and conducting ablation experiments; and validating the model using the original images without data augmentation. This invention significantly improves the accuracy and robustness of skier status analysis through the synergistic optimization of data augmentation and image feature transformation techniques, providing an efficient solution for image data processing by drones in complex ski resort environments.

The utility model relates to a lamp connecting structure for a skiing hall, which is suitable for being mounted on a roof thermal insulation layer and comprises a connecting rod, a lamp structure, a junction box, a reserved pipe and a thermal insulation block, a mounting hole is formed in the roof thermal insulation layer, the connecting rod penetrates into the mounting hole, and the upper portion of the connecting rod is arranged on the outer side of the roof thermal insulation layer in a threaded connection mode; the lamp structure is arranged on the inner side of the roof heat preservation layer and is in threaded connection with the lower portion of the connecting rod. The junction box is arranged on the outer side of the roof heat preservation layer, and an electric wire of the junction box penetrates through the mounting hole and is electrically connected with the lamp connecting rod; the reserved pipe is arranged in the mounting hole and is connected with the inner circumference of the mounting hole in a bonding manner; the connecting rod and the electric wire penetrate into the reserved pipe; the heat preservation block is arranged on the upper portion of the connecting rod in a sleeving mode and attached to the outer layer of the roof heat preservation layer, and a gap between the mounting hole and the connecting rod is sealed. By arranging the heat preservation blocks and the reserved pipes, the sealing performance of the positions where the connecting rods penetrate through the mounting holes is further optimized, and therefore the electricity utilization cost in the ski field is saved.

A ski resort management system comprising: a data acquisition system that receives data from telemetry systems of the lift systems, of the snow generators and of the snow groomers of the ski resort; a processing station; mass storage units, containing a system database fed by the data acquisition system; and a display interface, accessible from operator terminals. The data acquisition system stores data and signals from the lift systems, the snow generators and the snow groomers in the system database. The processing station enables setting a mode of the display interface for alternatively displaying data relative to each lift system, to each snow generator or to each snow groomer, or to display, in an aggregated form, data relative to all the lift systems, all the snow generators and all the snow groomers.

The utility model relates to the technical field of ski field safety detection, and discloses a field safety detection device before skiing teaching, which comprises a cross-shaped substrate, a rotary driving assembly, a depth control assembly, a circular semiconductor chilling plate and a sampling barrel assembly, the hot end of the circular semiconductor chilling plate faces upwards, the cold end of the circular semiconductor chilling plate faces downwards, and the sampling barrel assembly is detachably connected with the circular semiconductor chilling plate. The utility model particularly provides a field safety detection device before skiing teaching, which is provided with a circular semiconductor chilling plate and an electronic scale with a hook.

The invention is suitable for the technical field of image processing, and provides a graphic processing-based snowfield unmanned aerial vehicle image safety state analysis method, which comprises the following steps of: shooting a snowfield image through an unmanned aerial vehicle camera, and constructing a data set through a graphic data enhancement technology; a YOLOv11 model is improved to obtain a YOLO-ROSP model: a selective kernel attention mechanism is introduced, a lightweight convolution module based on channel shuffling-single aggregation is designed, and a lightweight multi-scale feature transformation architecture is constructed; training and verifying the model, and performing an ablation experiment; and verifying the model by using an original image which is not subjected to data enhancement. According to the method, through collaborative optimization of data enhancement and a graphic feature transformation technology, the precision and robustness of skier state analysis are remarkably improved, and an efficient solution is provided for graphic data processing of the unmanned aerial vehicle in a complex snowfield environment.

The present invention is applicable to the field of artificial ski resorts, and provides an artificial ski resort based on a box structure and a control system thereof, including a frame structure composed of a plurality of bottom ribs and columns, a heat-insulating top plate and a plurality of heat-insulating upright plates are fixedly connected to the frame structure; the bottom ribs, the upright plates, the heat-insulating top plate and the heat-insulating upright plates together constitute a box structure; a ski blanket device with an electrically adjustable inclination angle is installed inside the box structure, a first display unit is installed in front of the running direction of the ski blanket device, and a detector is installed inside the box structure. Thus, the device can be easily assembled and disassembled, shortening the construction period and being movable, adjusted and optimized as needed. It is easy to assemble and expand the scale, and the area of ​​the ski resort can be expanded by adding boxes. The construction cost is relatively low, and it can be reused, which greatly reduces the long-term operating cost.

The invention relates to the technical field of computer vision and radio frequency identification, particularly discloses a skier video snapshot method and system based on RFID and vision cooperation, and aims to solve the technical problems of missing shooting, excessive shooting, high false detection rate and insufficient accuracy of skier video automatic snapshot in a complex environment of a snowfield. The method comprises the following steps: acquiring motion parameters such as instantaneous speed and acceleration of a skier through an RFID card reader array deployed along a slideway, predicting a time node when the skier arrives at an optimal ROI (Region of Interest) region of a camera view, starting visual identification based on a YOLO V5 model before and after the node, capturing a video, and binding the video with an RFID tag code; the system comprises an RFID card reader array, an electronic tag, a high-definition camera device and a plurality of functional modules, can dynamically adjust an ROI (Region of Interest) and a visual search window, and is equipped with a standby monitoring mechanism. According to the invention, space-time cooperation of RFID and visual technology is realized, snapshot accuracy is significantly improved, missed shooting rate and multi-shooting rate are reduced, congestion analysis can be provided for scenic spots, and value-added services are provided for skiers.

The utility model discloses a supporting device for a ski field protective net, which comprises a first protective net, a buried plate and a supporting mechanism, the first protective net is fixedly mounted on the front side of the buried plate, inclined plates are mounted on two sides of the top of the buried plate, pull ropes are mounted at the bottoms of the inclined plates, and the supporting mechanism is fixedly mounted on the first protective net. The end, away from the inclined plate, of the pull rope is fixedly connected with the top of the first protective net, the mounting groove is formed in the top of the buried plate, the mounting shaft is fixedly mounted on the inner wall of the mounting groove, the supporting plate is rotatably mounted on the surface of the mounting shaft, and the second protective net is fixedly mounted on the top of the buried plate. By arranging the supporting mechanism, the supporting mechanism can support the inclined plate after rotating after being installed, so that the strength of the inclined plate is improved, the inclined plate is prevented from inclining and breaking when the first protective net is strongly impacted, the strength of the inclined plate can be improved, and the service life of the inclined plate is prolonged. And therefore, the use safety of the first protective net and the inclined plate is improved.

The invention relates to the technical field of building construction, in particular to a snowfield ground waterproof heat preservation structure in direct contact with ground surface soil and a construction method thereof, the snowfield ground waterproof heat preservation structure comprises a ground surface, and an anti-freezing layer, a vapor barrier layer, a rigid layer, a heat preservation layer, a first protection layer, a waterproof layer, a second protection layer, a refrigerant layer and a snow layer are sequentially arranged above the ground surface; a hot coil pipe and a second temperature sensor are arranged in the rigid layer, a drainage pipe is arranged in the anti-freezing layer, and the drainage pipe is fixed in the anti-freezing layer through a support; the heat preservation layer is formed by splicing two layers of extruded sheets in a staggered mode, and the two layers of extruded sheets are fixed through a binding agent. A cooling coil pipe and a first temperature sensor are arranged in the refrigerant layer. The system can well adapt to the influence of surface environment change on a structural layer, has good waterproof and heat preservation effects, can preserve heat of the snowfield, can control the temperature of the snowfield, promotes timely drainage of surface free water, avoids damage to the structural layer due to freeze thawing of sandy soil, and saves the later operation cost of the snowfield.