669results about "Protective construction" patented technology

The invention discloses a reinforcing device before dangerous rock removal and treatment, which comprises at least two pairs of fixed anchor rods, the two pairs of fixed anchor rods are arranged in a matrix, the two pairs of fixed anchor rods are embedded in dangerous rock, the two pairs of fixed anchor rods are externally connected with a protective net, and the reinforcing device further comprises a pair of traction anchor rods arranged between the two pairs of fixed anchor rods. The invention relates to the technical field of dangerous rock reinforcement, the drilling, cooling and grouting functions are integrated through the hollow anchor rod, and the rock mass damage risk is reduced through single-point construction; the flexible connection system can effectively resolve the rock mass displacement stress; a gapless interception system is formed by the double-layer structure of the protective net and the blocking net, and falling stone impact energy is dissipated by the hydraulic buffer device in a grading manner; according to the design of the split type positioning hanging rings and the quick-release pins, modularized quick replacement of the protective net is achieved, the construction complexity is reduced through the standardized anchor rod assembly, the requirement for the number of anchoring points is reduced through cooperative bearing of the traction anchor rods and the fixed anchor rods, and the dangerous rock reinforcing safety and the construction efficiency are remarkably improved.

The present application discloses a method for measuring impact force of debris flow and application, and a design method for barrier energy dissipation pile array. The method for measuring vertical impact force of debris flow measures the tangential velocity of debris flow at the impact point to measure the vertical impact force distribution of debris flow on the impact point. Further, the design method for pile array simplifies the free section of energy dissipation pile as a cantilever beam, which generates a bending resistance when impacted by debris flow, and the bending resistance continuously works to dissipate the impact kinetic energy of debris flow. According to the motion characteristics of debris flow, the impact time and distance parameters are further derived to solve the problems of measuring and designing the stability parameters of single energy dissipation pile, the energy dissipation parameters of barrier energy dissipation pile array, and the number parameters of barrier energy dissipation pile array. The present application also provides the application of each measuring and designing method. The present application provides a more scientific and perfect solution for the energy dissipation design of barrier energy dissipation pile array to resist the impact damage of rockfall and debris flow caused by landslide disaster.

The invention relates to the field of wind and sand prevention and control, in particular to a desert photovoltaic large base peripheral prevention and control system and method. The prevention and control system comprises a main air guide direction prevention and control system and a secondary air guide direction prevention and control system; the main wind direction prevention and control system is sequentially provided with three high vertical sand blocking fences, a lateral anti-lateral quicksand fence, a first sand stabilization grid area with a grid structure, two first plant sand blocking forest belts, a first plant sand stabilization area and a windproof sand blocking dust suppression fence in the direction from the upwind direction to the photovoltaic base. And the secondary wind guide direction prevention and control system comprises a second sand stabilization grid area, a second plant sand blocking forest belt and a second plant sand stabilization area. The sand prevention system can effectively solve the problems that an existing sand prevention technology is low in efficiency, unsustainable and the like, erosion and damage of sand grains to photovoltaic panels and infrastructures are reduced, the power generation efficiency is improved, the maintenance cost is reduced, long-term stable and efficient operation of a desert photovoltaic large base is guaranteed, and powerful support is provided for energy development and ecological protection balance in the desert area.

The invention belongs to the technical field of side slope protection equipment, and particularly discloses an energy dissipation buffer device for a side slope flexible protection net, the energy dissipation buffer device comprises a connecting rod, a connecting cylinder, an elastic piece and a rope, the connecting rod comprises a traction section and an extending section, the extending section is of a screw rod structure, the connecting cylinder comprises a cylinder body and a disc body, a first through hole is formed in the closed end of the cylinder body, and the elastic piece is arranged in the first through hole; a tooth block matched with the spiral groove is arranged on the first through hole; the cylinder body is arranged on the extending-in section in a sleeving manner, and the extending-in section can penetrate out of the first through hole; when the stretching-in section moves along with the traction section and penetrates out of the first through hole, the tooth block slides in the spiral groove, and linear sliding motion of the stretching-in section is converted into rotation of the barrel; the elastic piece is located in the cylinder, one end of the elastic piece is attached to the stretching-in section, the other end of the elastic piece is attached to the cylinder, and one ends of the ropes are fixed to the traction section. The four core pain points of'one-time consumption, low energy dissipation efficiency, high maintenance risk and concentrated local stress' of a traditional slope buffering technology are effectively solved.

The invention relates to the technical field of highway lighting, and particularly discloses a photovoltaic lighting structure for a central isolation strip of an expressway, the photovoltaic lighting structure comprises a plurality of foundation columns fixedly mounted on a highway pavement and a plurality of wave baffles mounted on the foundation columns, and a plurality of light holes are formed in the wave baffles; the lighting mechanism is arranged on the outer side of the outer wall, close to one side of the foundation column, in the wave baffle; the power mechanism is arranged in the middle of the road and can receive airflow flowing power generated when the two-way traffic flow passes through, convert the airflow flowing power and transmit the airflow flowing power to the lighting mechanism. The photovoltaic mechanism is arranged between the power mechanism and the lighting mechanism and used for providing electric energy for the lighting mechanism. The light-transmitting pieces can correspond to the light-transmitting holes in position, light of the lighting mechanism penetrates through the light-transmitting pieces to be projected on the road surface, and a plurality of warning irradiation areas with different distances from the wave baffle are formed. According to the invention, an integrated photovoltaic illumination structure with autonomous energy supply, anti-dazzle and accurate projection warning is realized.

To provide a bamboo-falling prevention structure that can effectively prevent the highly uncertain falling of bamboo by a simple method. [Solution] The system comprises a plurality of support posts 10 set up at intervals, a plurality of barrier ropes 20 laid horizontally at intervals in the vertical direction between the heads of adjacent pairs of support posts 10, buffer devices 25 installed near both ends of the barrier ropes, and cross ropes 30 stretched across the upper and lower parts of adjacent pairs of support posts 10, and the sliding resistance of the plurality of barrier ropes 20 prevents the bamboo from tipping over.

The present invention relates to the technical field of slope rockfall protection, and provides a rockfall pre-sensing active avoiding type steel column supporting system which comprises a rotatable column foot, a deflection steel column, a pulley node, a pre-sensing upper pulling anchor rope and a connecting piece. A bottom lug plate of the deflection steel column is provided with a hole, the fit tolerance of a diameter of the hole and a diameter of a pin shaft is large, so as to help the steel column to rotate in a horizontal direction. The pulley node is provided with double pulleys, a pre-sensing pull-up anchor rope is wound on each of the two pulleys, two anchor points of each rope are distributed on two sides of a projection line (hereinafter referred to as the projection line) of an initial axis of the steel column on a slope surface, one anchor point is near the projection line, and the other anchor point is far away from the projection line. Before falling rocks impact the steel column, the pull-up anchor rope on one side near the projection line is firstly impacted, and the steel column deflects towards the other side under the action of a resultant force of the pull-up anchor rope, so that falling rock impact can be avoided or impact damage of the steel column can be reduced. The protection problem that falling rocks directly impact the steel columns is solved, and the impact resistance reliability and disaster prevention toughness of the passive nets are greatly improved.

The invention belongs to the technical field of side slope protection, and particularly relates to a side slope protection device for highway reconstruction and extension and a method of the side slope protection device. Inclined pressing rods are hinged to the end parts of the supporting seats; a group of criss-cross intercepting rods are fixedly connected between the inclined pressing rods; angle adjusting assemblies are arranged between the supporting bases and the inclined pressing rods. The angle adjusting assembly comprises an adjusting groove; an adjusting block is slidably connected into the adjusting groove. A connecting rod is hinged between the adjusting block and the inclined pressing rod; the supporting base of the slope protection device is fixed to the ground of the side edge of a road, the adjusting block slides to adjust the inclination angle of the inclined pressing rod, the inclined pressing rod is promoted to be attached to the surface of a slope, then the pin is inserted into the pin hole and the connecting hole, the multiple protection devices are sequentially arranged, and the angle of the inclined pressing rod is adaptively adjusted according to different gradients of the slope; the supporting strength of the side slope is improved, the collapse phenomenon of the side slope in the construction process is prevented, and construction operation and traffic safety are improved.

The invention discloses a landslide buffering and energy absorbing device based on a positive and negative Poisson's ratio alternating material, which comprises a protection plate I and a protection plate II which are oppositely arranged, and a positive and negative Poisson's ratio alternating layer is clamped between the protection plate I and the protection plate II; the positive and negative Poisson's ratio alternating layers comprise positive Poisson's ratio honeycomb layers and negative Poisson's ratio honeycomb layers which are alternately arranged in the transverse direction; the elastic modulus of the negative Poisson's ratio honeycomb layer material is not less than that of the positive Poisson's ratio honeycomb layer material; the positive Poisson's ratio honeycomb layer and the negative Poisson's ratio honeycomb layer are connected through a connecting rod layer, and the connecting rod layer is connected with the positive Poisson's ratio honeycomb layer and the negative Poisson's ratio honeycomb layer on the two sides in an attached mode. By reasonably arranging the positive and negative Poisson's ratio alternating layers, the problems of energy absorption and protection of the landslide blocking structure and insufficient rigidity of a single negative Poisson's ratio material are solved, and the blocking structure can be effectively reinforced by applying the positive and negative Poisson's ratio alternating layers to the head-on collision side of the landslide blocking structure.

The invention provides a preparation method of a debris flow protection engineering self-repairing concrete part by using microorganisms and magnesium oxide, which comprises the following steps: S1, dipping a porous aggregate base material with the particle size distribution of 1-5mm in a urease-producing microbial agent, and enabling urease-producing microorganisms in the urease-producing microbial agent to fully enter pores of the porous aggregate base material; s2, urea and magnesium oxide are added into the urease-producing microbial agent impregnated with the porous aggregate base material to obtain a mixed solution, the mixed solution is maintained for 2-5 days, the self-repairing aggregate with the particle size distribution ranging from 2 mm to 10 mm is obtained, urea, urease-producing microorganisms, magnesium oxide and water react with one another in the maintenance period, a hardened shell wrapping the outer surface of the porous aggregate base material is generated, and the self-repairing aggregate with the particle size distribution ranging from 2 mm to 10 mm is obtained. Urea and urease-producing microorganisms are retained in pores of the porous aggregate base material, and the hardened shell comprises brucite, basic magnesium carbonate and magnesium oxide which is not completely reacted; and S3, mixing the self-repairing aggregate with the debris flow protection material, and curing to obtain the debris flow protection engineering self-repairing concrete piece utilizing the microorganisms and the magnesium oxide.

An explosion chamber for an avalanche triggering system including a lower half-chamber closed at its lower end and having an opening at its upper end, and an upper half-chamber closed at its upper end and having an opening at its lower end. The lower end of the upper half-chamber extends around the upper end of the lower half-chamber, or the upper end of the lower half-chamber extends around the lower end of the upper half-chamber, so as to create at least one gas flow channel. The gas flow channel includes a baffle formed by the lower end of the upper half-chamber and the upper end of the lower half-chamber.

The invention relates to a railway girder and truss integrated bridge shed and a construction method thereof. The railway girder and truss integrated bridge shed comprises low-height prestressed concrete box girders, truss web members, truss upper chords and cast-in-place reinforced concrete plates. The truss upper chord members are positioned on two transverse sides above the low-height prestressed concrete box girder and are longitudinally arranged; the truss web members are arranged on the two transverse sides of the low-height prestressed concrete box girder and are longitudinally inclined, the tops of the truss web members are fixedly connected to the truss upper chord members, and the bottoms of the truss web members are fixedly connected to the low-height prestressed concrete box girder; a cast-in-place reinforced concrete plate is arranged on the top of the truss upper chord, and the bottom of the cast-in-place reinforced concrete plate is poured into the truss upper chord, namely concrete is poured into the truss upper chord. The truss structure and the box girder are effectively connected, so that the truss not only bears the supporting effect of the protective component, but also forms a stress whole with the main girder, the defect that additional load of a traditional shed tunnel acts on the main girder is overcome, and the overall rigidity, stability and durability of the structure are remarkably improved.

The invention discloses an integrated method for realizing sand prevention and stabilization and soil improvement based on coal gangue, which comprises the following specific steps: crushing the coal gangue, grading and screening, taking the coal gangue with the particle size of 0.1-10 mm, and adding bacillus thuringiensis and a compound additive into the coal gangue for activating treatment; the activated coal gangue is mixed with sand grains, then the coal gangue with the grain size being 10-100 mm is laid on the desert earth surface, and integrated treatment is completed; under the combined action of the bacillus thuringiensis and the compound additive, degradation of the coal gangue is accelerated to form a fine particle matrix, and organic matters contained in the coal gangue are synchronously degraded to generate humic acid; meanwhile, metabolites of the bacillus thuringiensis and biological enzymes can promote slow release of nutrient elements such as silicon, potassium and phosphorus in the coal gangue, so that the physical and chemical properties of desert sand grains are improved, and the dual purposes of sand prevention and stabilization and soil improvement are finally achieved by combining the surface laying effect of the coal gangue with the large particle size.

The application relates to a kind of urban bridge middle strip gap self-explaining intersection safety device design systems, including the longitudinal gap self-explaining intersection safety device of setting in the middle strip of elevated bridge upper layer and the indicating guide device of setting in the lower layer of elevated bridge, the longitudinal gap self-explaining intersection safety device includes anti-falling net and self-explaining anti-dazzle device, the anti-falling net and the self-explaining anti-dazzle device are fixedly arranged on the crossbeam of elevated bridge, the indicating guide device is arranged on the road surface under bridge, the self-explaining anti-dazzle device includes louvered shutter, longitudinal rib and transverse beam;The louvered shutter is fixedly arranged on the crossbeam of elevated bridge, the transverse beam is anchored in the side of crossbeam of elevated bridge, and the longitudinal rib is anchored on the transverse beam.The road surface projection point, line, circle of middle strip gap sunlight in the application become intermittent, dispersed, random, reduce the driving interference to road surface driver, and strengthen road surface indicating guide device, meet the psychological expectation of driver, and then realize easy, safe driving.

The utility model relates to the field of geotechnical engineering, in particular to an assembly type rockfall emergency blocking structure which comprises a plurality of prefabricated blocking nets, a plurality of prefabricated micro piles and a plurality of prefabricated blocking columns. The prefabricated micro piles are embedded and inserted into a foundation pit which is deeply excavated in advance; the prefabricated micro pile comprises a first connecting section, and the first connecting section is located on the upper portion of the prefabricated micro pile. The prefabricated blocking column comprises a second connecting section, and the second connecting section is located on the lower portion of the prefabricated blocking column. The first connecting section is connected with the second connecting section, and the first connecting section and the second connecting section are detachable; the prefabricated blocking nets are connected between every two adjacent prefabricated blocking columns, and the prefabricated blocking nets and the prefabricated blocking columns are detachable. The dangerous rock emergency danger reduction barrier is convenient to disassemble and assemble and can be recycled.

The invention relates to a protective barrier for catching a moving object, comprising a net and a supporting structure (6); wherein the supporting structure (6) stretches out and fastens the net (2); and wherein the net (2) has at least a first cable (90) and a second cable (91) with a respective thickness, wherein the net (2) is connected by the first cable (90) and the second cable (91), and the net (2) has at least one connection point (7), wherein the connection point (7) has a thickness, and the thickness of the connection point (7) corresponds at most to twice the thickness of the first cable (90) or to twice the thickness of the second cable (91), wherein the first cable (90) and the second cable (91) contain polyethylene, and the stretched-out net has an energy weight class of 500 kJ / (kg / m2) or more.

The utility model discloses a passive blocking and protecting structure for ditch source collapse rolling stones, which comprises a multi-stage blocking structure arranged in a ditch and a buffer percolation structure arranged on the inner side of the blocking structure, the blocking structure further comprises a sheet-pile wall and a gravity type check dam, the sheet-pile wall is arranged at the lower part or the tail end of the ditch source collapse of the ditch, and the gravity type check dam is arranged on the lower part or the tail end of the ditch source collapse of the ditch. A multi-stage gravity type check dam is distributed in the channel on the front side of the sheet-pile wall; the blocking structure can be completely arranged to be a sheet-pile wall or a gravity type check dam. The blocking structure can be alternately provided with sheet-pile walls and gravity type check dam dams according to terrains; the buffering percolation structure further comprises a buffering layer, a rockfall groove and a percolation structure. Through the design of the blocking structure, the buffer layer and the percolation structure, the purposes of blocking rolling stones, draining ditch water and effectively preventing the ditch source from collapsing the rolling stones can be achieved.

The smart city intelligent guiding signboard comprises a stand column and a cover cap, a first sliding groove is formed in the stand column, and the bottom of the inner wall of the first sliding groove is rotationally connected with a threaded rod. The utility model has the beneficial effects that the height of the direction board is adjusted to adapt to different use scenes and requirements, for example, in peak traffic hours, the direction board can be lifted so as to be clearly seen by vehicles and pedestrians in the distance, and can be lowered when not needed, so that the direction board is prevented from being damaged, and the direction board is adjusted along with urban planning, new landmark emergence or activity holding; the direction board can be quickly replaced, and the latest guiding information can be accurately transmitted; in addition, according to busy degrees of different road sections and requirements of special time periods, direction boards can be flexibly added, information transmission efficiency is improved, pedestrians and vehicles can be assisted to pass smoothly in an all-around mode, a display screen visually provides auxiliary guiding information for people, the direction boards and the display screen supplement each other, and the urban guiding service level is greatly improved.

The application relates to the field of slope protection, and discloses a supporting structure convenient to disassemble for slope treatment, which comprises a protection seat, one side of the protection seat being connected with a storage seat, one side of the storage seat being provided with a connecting unit; a positioning mechanism fixedly connected on a slope, the positioning mechanism being provided with multiple, and the positioning mechanism being connected with the connecting unit; and an intercepting mechanism installed on the positioning mechanism, the multiple intercepting mechanisms being connected with each other, the supporting structure can be conveniently installed and disassembled, forms an integral whole, and is convenient for the installation of the integral whole; the supporting structure can also be disassembled at corresponding points in the subsequent process, the influence on the environment is reduced, the stability of the slope is ensured through cooperation with multiple-point limitation, and the possibility of landslide is reduced.

The utility model belongs to the technical field of sand prevention and control, particularly relates to a seed rope biological sand barrier convenient to lay and fix, and aims at solving the problems that an existing sand barrier is inconvenient to lay and low in laying efficiency, and the following scheme is provided: the seed rope biological sand barrier comprises a sand barrier belt assembly and a seed rope assembly, the sand barrier belt assemblies are supported by filling the sand into the sand barrier belt assemblies, so that the sand barrier belt assemblies are flatly laid on the surface of the sand, and convex wreckers are formed on the sand surface by laying the sand barrier belt assemblies in a crisscross manner, so that the effects of reducing the wind speed and fixing the sand surface are achieved; the seed rope assembly can enable planted seeds to grow and germinate in rainy days or after irrigation, more plants grow on the surface of the sand land, root systems of the plants can be inserted into the sand land, the wind prevention and sand fixation effects are further achieved, large-scale mechanical equipment is not needed for auxiliary laying during laying, and after the sand barrier belt assembly is laid, the sand barrier belt assembly can be conveniently and rapidly laid. Therefore, the laying of the seed rope assembly can be completed, and the laying efficiency is greatly improved.

The invention relates to a geomaterial sheet comprising a first organic structural material and a second structural material, different from the first, which are connected to the first structural material to form a planar composite material sheet extending in two mutually perpendicular directions. The invention is characterized in that the first structural material and the second structural material are organic materials, the first structural material exhibits a first biodegradability to a certain extent, and the second structural material exhibits a second biodegradability that differs from the first biodegradability, in particular being lower than the first biodegradability.

The invention provides a wide valley U-shaped channel mountain torrent debris flow prevention and control method based on a mountain torrent sediment transport rule, and the method comprises the steps: determining a formation region, a circulation region and an accumulation region of a large watershed debris flow channel, and determining debris flow channel parameters; determining the characteristics of the mud mark section; calculating debris flow characteristic parameters; a target bedrock section is selected, and the design height of a target dam body is calculated according to section characteristics of the target bedrock section, debris flow channel parameters, mud mark section characteristics and debris flow characteristic parameters; according to the method, an open type grating dam is arranged at a section where flood is often encountered, rolling type earth and rockfill dams are arranged at other positions of the section, and design construction is carried out according to a target design specification and the design height of a target dam body, so that the problem that when debris flow occurs, an existing prevention and treatment project loses efficacy due to deposition of silt carried by long-term erosion of mountain torrents is solved; and the service life of the prevention and treatment project in the drainage basin is greatly prolonged, and the expected effect can be achieved when debris flow occurs.

The utility model belongs to the technical field of road safety protection equipment, and particularly relates to a combined guardrail, which is characterized in that support bases are arranged at intervals, support rods are vertically arranged above the support bases, and a transverse guardrail is arranged at the upper ends of the two support rods, so that the combined guardrail is formed. The protection height of the guardrail can be increased under the condition that the height of the supporting base is not increased; in addition, the two adjacent supporting bases are connected through the connecting guardrails, the connecting guardrails are arranged on the side faces of the bases, and therefore the overall anti-collision performance of the guardrail can be further improved. The guardrail is simple in structure, the supporting base can be prefabricated in advance, on-site assembly is achieved, and all parts of the guardrail can be recycled.

The invention discloses clay conveying equipment and a sand barrier laying mechanism. Comprising a frame body, a conveying mechanism is arranged in the middle of the frame body, the conveying mechanism comprises a conveying shaft, a conveying piece and a detection pipe, the conveying shaft is rotationally arranged in the middle of the frame body, the detection pipe is arranged in the conveying shaft, one end of the detection pipe is communicated with an extrusion pipe, and one side of the extrusion pipe is in contact with an extrusion frame; a detection pipe is arranged on one side of the frame body, a control mechanism is arranged on one side of the detection pipe and comprises a floating valve, a control valve and a control wheel, the floating valve is arranged on one side of the detection pipe in a sliding mode, an air conveying pipe is arranged on the edge of the frame body, and a downward pressing valve is arranged at one end of the air conveying pipe in a sliding mode. The angle can be adjusted through the dredging block, the dredging block stops for a period of time, the dredging block can spray out gas in a large range through first adjustment, and clay in the adjusting position is dredged in a large range.

The invention discloses a bionic structure supporting device for geological disaster emergency and an arrangement method, and relates to the technical field of rockfall prevention supporting, the bionic structure supporting device comprises a bionic mechanism, the bionic mechanism comprises a plurality of longitudinal wires, and a plurality of transverse wires are fixedly connected among the longitudinal wires; the foundation pit high-pressure pile manufacturing mechanism is mounted on the bionic mechanism and comprises a plurality of pit wall extrusion plates; a spider web steel wire structure is simulated through the bionic mechanism, the flexible net body absorbs kinetic energy through elastic deformation buffering during falling stone impact, flexible interception is achieved, and the defect that a rigid structure is prone to being damaged is overcome; by means of the overall cooperation characteristic of local stress, impact force is dispersed to the whole net body and an anchoring system, stress concentration is reduced, and impact resistance and protection stability are improved. The high-pressure pile manufacturing mechanism is installed before concrete injection, and pressure is applied to the foundation pit wall to increase friction force; after concrete is injected, the bonding strength is enhanced, foundation pile displacement caused by soil loosening is prevented, and the stability of falling stone bearing capacity is ensured.

The utility model belongs to the technical field of mining, and particularly relates to a protective dam in a mine high and steep slope area, which comprises a mine high and steep slope, a protective net is arranged on the mine high and steep slope, a mine high and steep slope mounting platform is arranged on one side of the mine high and steep slope, and the mine high and steep slope mounting platform is of a hollow structure. A protection plate is installed on the top of the mine high and steep slope installation platform, a supporting plate is installed on one side of the protection plate, the bottom of the supporting plate is connected with the mine high and steep slope installation platform, an anti-splashing plate is hinged to the other side of the protection plate and is of an L-shaped structure, a buffering assembly is arranged on the anti-splashing plate, and one side of the buffering assembly is connected with the protection plate. The mine high and steep slope installation platform is provided with a water inlet, an impurity discharging opening and a water discharging pipe which are communicated with the middle cavity. According to the device, the high and steep slope area of the mine is effectively protected, water flow is reasonably treated, and potential safety hazards and environmental influences are reduced to the maximum extent.

The utility model discloses an automatic roller changing mechanism of a grass grid laying vehicle, which comprises a grass roller, an inner support rotating mechanism, a rotating blocking mechanism and a telescopic blocking mechanism, and the automatic roller changing mechanism is carried on the grass grid laying vehicle and is uniformly controlled by a controller; the inner support rotating mechanism is connected with the sliding table to be installed on the rear rack and is pushed by a telescopic air cylinder. And the rotary blocking mechanism and the telescopic blocking mechanism are respectively controlled by an electric control rotary table mounted below the rear rack and a telescopic cylinder mounted above the front rack. The automatic roller changing mechanism of the straw grid laying vehicle solves the problem of automatic straw mat changing of the straw grid laying vehicle, the labor cost is reduced, and straw grid laying is more automatic. The grass checkered sand-protecting barrier can meet the requirements for wind prevention and sand fixation in the technical field of ecological protection engineering construction, the laying efficiency of the grass checkered sand-protecting barrier is improved, and the cost is reduced.

A photovoltaic antiglare panel assembly, a photovoltaic power generation system, and a photovoltaic subgrade system are provided. The photovoltaic antiglare panel assembly includes: a photovoltaic antiglare panel, the photovoltaic antiglare panel including double-layer tempered glass and a plurality of solar cells arranged between the double-layer tempered glass; a frame, the frame being sleeved on the periphery of the photovoltaic antiglare panel; a fixing unit, arranged at the bottom of the frame; and a power utilization unit, the power utilization unit being arranged in the fixing unit, and the power utilization unit being in electrical connection with the plurality of solar cells.

The utility model discloses a cantilever shed tunnel which comprises an upper-layer supporting system installed on a side slope, a lower-layer supporting system installed on the side slope and located below the upper-layer supporting system, and an upper-layer protective net with one side fixed to the upper-layer supporting system and the other side fixed to the portion, above the upper-layer supporting system, of the side slope. One side of the lower-layer protective net is fixed on the upper-layer supporting system, and the other side of the lower-layer protective net is fixed on the lower-layer supporting system; the side, away from the side slope, of the upper-layer protective net and the side, away from the side slope, of the lower-layer protective net incline downwards. The device has two-stage buffering performance, and can reduce the impact of rockfall on the shed tunnel. Meanwhile, a double-layer steel column supporting system is adopted, so that the stability of the shed tunnel is improved.