104results about How to "Large span" patented technology

The invention provides an intermittent illumination yield increasing method, which comprises the following steps of: arranging shading strips above the ground at certain intervals, and continuously shielding, releasing, re-shielding and re-releasing shadows of the shading strips to shield sunlight irradiating the same crop so as to intermittently illuminate the crop, the photosynthetic efficiency reduction caused by the photosynthesis inhibition mechanism activated by continuous strong light is avoided, so that the crop growth is stimulated, and the crop yield is increased. The device has multiple gain functions such as intermittent illumination yield increasing, water delivery irrigation yield increasing, night light supplementing yield increasing, bird repelling and rat repelling yield keeping, power generation / heat collection income increasing and the like, and agricultural production can be effectively promoted.

The invention relates to the technical field of conductivity detection, in particular to a connector conductive terminal electroplating detection system. Comprising an unwinding device and a winding device; the unwinding device and the winding device are respectively used for unwinding and winding a material belt with a conductive terminal; a detection device is arranged between the unwinding device and the winding device; the detection device comprises a base; an auxiliary motor is arranged at the rear position of the base; an output shaft of the auxiliary motor is fixedly connected with a detection roller forwards; the detection roller is located right above the base, and the axial direction of the detection roller is consistent with the front-back direction of the base; a plurality of detection pieces are uniformly arranged on the outer wall of the detection roller in the circumferential direction; according to the invention, the plurality of detection pieces on the outer wall are driven by the detection roller to be in contact with the conductive terminals on the material belt in the conveying process in sequence, so that the conductivity detection of the conductive terminals of the connector is completed without pause, and the electroplating detection efficiency of the conductive terminals of the connector is improved.

The invention discloses a three-cable photovoltaic flexible support system, belongs to the technical field of photovoltaic supports, and can solve the problems that a traditional fixed photovoltaic support cannot be used and installed under complex mountain conditions, the land use efficiency is reduced, and the overall photovoltaic power generation capacity is affected. The system comprises two end fixing units which are symmetrically arranged at the two ends of an erection area; the middle supporting units are distributed between the two end fixing units in a row; one ends of the first main cable and the second main cable are connected with one end fixing unit, and the other ends of the first main cable and the second main cable sequentially penetrate through the two ends of the tops of the middle supporting units and are connected with the other end fixing unit; two ends of the bottom edges of the inverted tripods are respectively fixed on the first main rope and the second main rope; one end of the auxiliary cable is connected with one end fixing unit, and the other end of the auxiliary cable sequentially penetrates through the vertexes of the inverted triangular supports and the middles of the tops of the middle supporting units to be connected with the other end fixing unit. The invention is used for supporting the photovoltaic module.

The utility model discloses an opposite-pulling asymmetric double-arch large-span stadium roof structure which comprises a front inclined giant arch and a rear inclined giant arch, and the front inclined giant arch and the rear inclined giant arch are connected through a plurality of opposite-pulling trusses to form a self-balancing system. The two ends of the rear inclined huge arch are supported by crotch-shaped arch foot columns, and the part between the two ends is supported by a plurality of V-shaped inclined columns arranged on the stand structure; only the two ends of the front inclined huge arch are connected with the crotch-shaped arch foot columns, and the front inclined huge arch is not connected with the stand structure. The large-span stadium roof overcomes the defects of an existing large-span stadium roof, and solves the problems that an existing stadium roof structural component is large in size, a building is heavy, the space sense and the light sense of the building cannot be highlighted, natural lighting cannot be achieved, and energy consumption is high.

The invention discloses a large-diameter slurry shield machine slurry pipeline pipe replacing device and method. The device comprises a pipe replacing trolley, a telescopic pipe device, a driving device, a rear matched trailer, a first pipeline support, a fixing frame and a new slurry pipe, and the pipe replacing trolley is connected with the rear matched trailer and can move back and forth in the length direction of the rear matched trailer; the telescopic pipe device is arranged on the rear matched trailer and supported by the first pipeline support, one end of the telescopic pipe device is connected with the pipe replacing trolley, and the other end of the telescopic pipe device is connected with the fixing frame. The driving device is arranged at the lower part of the pipe replacing trolley; during tunneling, the rear matched trailer drives the pipe replacing trolley to move forwards, the telescopic pipe device stretches out, the pipe replacing trolley moves backwards relative to the rear matched trailer, and when the pipe replacing trolley moves to the tail of the rear section trailer and reaches a pipe replacing distance, tunneling and slurry conveying are stopped, the pipe replacing trolley moves to the initial state, the telescopic pipe device retracts, and a new slurry pipe is replaced. Bend-free connection is achieved, and the pressure loss of a pipeline is small; the structure is simple and operation is convenient.

The invention provides an intermittent illumination yield increasing method, which comprises the following steps of: arranging shading strips above the ground at certain intervals, and continuously shielding, releasing, re-shielding and re-releasing shadows of the shading strips to shield sunlight irradiating the same crop so as to intermittently illuminate the crop, the photosynthetic efficiency reduction caused by the photosynthesis inhibition mechanism activated by continuous strong light is avoided, so that the crop growth is stimulated, and the crop yield is increased. The device has multiple gain functions such as intermittent illumination yield increasing, water delivery irrigation yield increasing, night light supplementing yield increasing, bird repelling and rat repelling yield keeping, power generation / heat collection income increasing and the like, and agricultural production can be effectively promoted.

The utility model relates to an underground passage entrance and exit structure with an internal emergency escape function, which comprises a frame and a cover plate, one side of the cover plate is connected with a first side of the frame through a hinge, and the underground passage entrance and exit structure further comprises a controllable telescopic rod, a telescopic rod mounting seat and a telescopic rod driver, the other end of the telescopic rod driver is rotationally connected with the telescopic rod mounting seat, and the telescopic rod driver is connected to a control signal input end of the controllable telescopic rod; the telescopic rod mounting base is mounted on the side wall of the entrance, the projection position of the telescopic rod mounting base on the vertical face is located below the frame, the frame is mounted in a basic mounting face at the entrance, and the upper surface of the frame is lower than the upper surface of the basic mounting face. Compared with the prior art, the controllable telescopic rod has the advantages that the initial driving force of the controllable telescopic rod is reduced, the attractiveness is improved, and the like.

The invention relates to a box girder and gate-type pier combined T-shaped rigid frame bridge and a construction method thereof. The box girder and gate-type pier combined T-shaped rigid frame bridge comprises concrete box girders, gate-type main piers and side piers. The gate-type main pier comprises two pier bodies and a cover beam, the two pier bodies are located on the two sides of the existing line, and the cover beam is located above the existing line and intersects with the existing line; the concrete box girder and the cover beam are arranged in a crossed manner and are positioned above the cover beam, and at the joint of the cover beam and the concrete box girder, the top of the cover beam and the bottom of the No.0 block of the concrete box girder are poured into a whole; the side piers are located on the two sides of the existing line, and the side piers are longitudinally arranged and supported at the bottom of the concrete box girder. Under the condition that the line height is limited, the pier-beam combination height can be reduced, the span is increased, and meanwhile the clearance requirement under the bridge is met; and meanwhile, the pier and the beam are fused, the integrity is good, material use can be reduced, the structural rigidity and the bearing capacity are improved, the span is increased, and better anti-seismic performance is achieved.

The invention provides a supporting leg system and an engineering machine. The supporting leg system comprises a supporting leg box, the supporting leg mechanism comprises a first supporting leg arm, a second supporting leg arm, a rotary driving part and a telescopic driving part, the first supporting leg arm is hinged to the supporting leg box, and the second supporting leg arm is arranged in the first supporting leg arm in a penetrating mode; the rotation driving piece and the telescopic driving piece are both electrically connected with the controller, and the controller is configured to obtain a supporting leg control instruction; under the condition that the supporting leg control instruction is obtained, the rotation driving part is controlled to drive one arm of the supporting leg to rotate relative to the supporting leg box according to the supporting leg control instruction; acquiring an avoiding angle range, a driving angle range and a current angle of one arm of the landing leg; when it is determined that the current angle is within the avoiding angle range, the telescopic driving part is shut down; and under the condition that the current angle is determined to be within the driving angle range, the telescopic driving part is controlled to perform telescopic driving according to the current angle. The safety of the landing leg system can be improved while the large span is achieved.

The present invention belongs to the field of building construction technology, and in particular, relates to an integrated assembled composite floor with thermal insulation and sound insulation structure, including a floor body, the upper end of which is fixedly connected with a plurality of connectors distributed in a rectangular array, a hollow layer having a thermal insulation effect is provided inside the floor body, and ventilation steel pipes connected to the outside are embedded in the inner walls of both sides of the hollow layer; and an adjustment component is used to adjust the thermal insulation effect of the hollow layer according to the outside temperature. The present invention can adjust the ventilation rate of the ventilation steel pipe according to temperature changes by setting an adjustment component, thereby adjusting the thermal insulation effect by changing the air convection speed; by setting an adaptive sound insulation component, the electric field strength around the deformable sound absorbing member can be adjusted according to the sound pressure of the outside world, and the sound insulation effect can be adjusted by changing the deformation degree of the deformable sound absorbing member.

This utility model discloses a concrete curing device for concrete preparation, belonging to the technical field of concrete curing devices. It includes a liquid storage tank, casters rotatably connected to the bottom of the tank, and a push handle welded to the end face of the tank. A support frame is welded to the end face of the tank, and a spray assembly is installed below the support frame. The tank is filled with liquid water. Construction workers push the tank, and a booster pump pressurizes the liquid water, which is then sprayed onto the concrete surface through a spray pipe and a spray hood at the bottom of an extension pipe, providing excellent curing results. The mounting base and the end of the extension pipe are fixedly connected. Depending on the span of the concrete structure, the extension plate is rotated relative to the support frame, and then the extension bolts are tightened. The insertion end of the extension bolt extends into the threaded groove, thereby adjusting and fixing the angle and position of the extension pipe, increasing its span, and improving curing efficiency during spraying.

The embodiment of the present invention discloses an industrial sewing machine that is easy to assemble, including a sewing machine head, a base, a feeding mechanism, an upper and lower shaft synchronization mechanism and a needle feed dog synchronization mechanism, wherein the upper and lower movement of the needle of the sewing machine head is driven by the upper shaft, and the forward and backward swing is driven by the feed shaft; the rotary shuttle of the base is driven by the lower shaft, and the feed dog is driven by the transition shaft; the upper shaft and the lower shaft are linked by the upper and lower shaft synchronization mechanism, and the feed shaft and the transition shaft are linked by the needle feed dog synchronization mechanism; the transmission paths of the upper and lower shaft synchronization mechanism and the needle feed dog synchronization mechanism all pass through the bracket behind the needle and the support seat on one side of the bracket; the feeding mechanism is arranged behind the needle for transmitting cloth. The present invention can realize the simultaneous sewing of mattress fabric and both sides of the chain, improve sewing efficiency, and at the same time ensure the symmetry of the cloth on both sides, so that the zipper opens and closes smoothly.

The utility model discloses an air rib type inflatable tent with an arch structure, which relates to the technical field of air rib type inflatable tents and comprises an arch-shaped supporting framework and outer tent cloth. The arched supporting framework comprises two bottom transverse air ribs, a plurality of middle arched air ribs and a plurality of end inclined arched air ribs; the two bottom transverse air ribs are arranged in parallel, and the ends of the two bottom transverse air ribs are connected and communicated through at least one end inclined arch air rib. The middle arch-shaped air ribs are arranged in parallel, and the two ends of each middle arch-shaped air rib are connected and communicated with one bottom transverse air rib respectively; the inner side of the outer tarpaulin is fixedly connected with the bottom transverse air ribs, the middle arched air ribs and the end inclined arched air ribs, and an inlet and an outlet which can be closed are formed in the outer tarpaulin. The device is low in cost, easy and convenient to install, convenient to carry, light in weight and large in span, has certain rockfall impact resistance and is lower than horizontal wind load and explosion impact.

The utility model relates to the technical field of power distribution, and discloses a low-voltage tubular bus duct, which is used for a low-voltage bus duct system and comprises at least three sheet-shaped phase line conductors, an insulating supporting piece is arranged between every two adjacent sheet-shaped phase line conductors, and the sheet-shaped phase line conductors are clamped in conductor mounting grooves of the insulating supporting pieces to form a tubular structure in a surrounding manner. The tubular structure is sequentially provided with a PE wire and an insulation protection layer from inside to outside. The phase line conductors are spliced to form the tubular structure through the insulating supporting pieces, compared with an existing rectangular intensive bus duct, the heat dissipation area of the bus duct is increased, the problems of poor heat dissipation and high temperature of the middle conductor caused by parallel stacking of the conductors are solved, the aging speed of the insulating supporting pieces is delayed, the service life of the bus duct is remarkably prolonged, and the service life of the bus duct is prolonged. The bus duct is compact in structure, small in occupied space and convenient to install, the current level can be adjusted by changing the thickness of the sheet-shaped phase line conductor, the cost is lower, the span is larger, and the universality is enhanced.

The planar segmented intelligent back burning device comprises a back burning detection device, a back burning heating device, axial flow fans and an air source box device, the back burning detection device and the back burning heating device are fixedly connected with an embedded part of a pit, and the axial flow fans are located at the left end and the right end of the pit and connected with an air suction pipeline of a workshop. The air source box device is fixed on pre-buried plates at the left end and the right end of a pit, the back burning detection device comprises a portal supporting stand column and a main cross beam, two transverse movement driving mechanisms are symmetrically arranged on the left side and the right side of the main cross beam, the transverse movement driving mechanisms are fixedly provided with lifting detection mechanisms, and the lifting detection mechanisms are provided with laser displacement sensors; the back burning heating device comprises a main body supporting mechanism and a baking gun mechanism; the laser displacement sensor is in communication connection with a baking gun servo motor of the baking gun mechanism; according to the invention, a group of double sets of laser displacement sensors are adopted, the deviation of the whole plane section in the transportation process can be identified, the welding deviation of a single longitudinal bone can also be identified, the precision and the accuracy are high, and the heat treatment effect of sheet body back burning is improved.

The present invention relates to an assembled sandwich panel filled with a combined box and a manufacturing method thereof, and belongs to the field of general building construction. The sandwich panel (1) comprises a combined box (2), a rib beam (3), and a panel (4). The rib beam has an upper iron (6), a lower iron (7) and stirrups (8), and the panel has plate reinforcement (9). The combined box is composed of a bottom plate (10) and a filling piece (11). The bottom plate has a cantilever plate (12). The bottom plate reinforcement (13) extends upward at the cantilever plate position. The bottom plate is provided with a stiffening rib (14). The filling piece has a pouring hole (15) and a notch (16) that matches the stiffening rib. Adjacent combined boxes are spliced ​​together, the rib beams and plate reinforcement are tied, and concrete is poured to form an assembled sandwich panel. The combined box of the present invention is very convenient to produce, transport and install. The floor slab formed by the sandwich panel has a large span, light weight and good integrity. The present invention has good economy and applicability, and promotes the development of construction technology.

A heavy-cast and light-cast building and construction method of a shell assembly system, comprising a hollow steel section column I, a pull-out wall shell net, a steel truss beam and a prestressed floor slab, wherein a plurality of the hollow steel section columns I are connected end to end, and the hollow steel section column I located at the floor elevation is connected to the steel truss beam, an insulation layer is provided on the outer side of the steel truss beam, and a prestressed floor slab is connected to the inner side of the steel truss beam, and a pull-out wall shell net is provided between the outer sides of two adjacent hollow steel section columns I, and the height of the pull-out wall shell net is consistent with the height of the hollow steel section column, the insulation layer is butted with the pull-out wall shell net, and the outer side of the insulation layer and the outer side of the pull-out wall shell net are located in the same plane; the hollow steel section column I, the steel truss beam, the pull-out wall shell net and the prestressed floor slab constitute a basic building module. The flexible arrangement of the basic building module in three-dimensional space constructs buildings of various shapes; the design, factory production and construction costs of the present invention are low, and it has huge market promotion potential.

The utility model discloses a track type crop harvesting device which comprises a plurality of T-shaped guide rails and a sliding base, a bottom plate is fixed to the bottom of each T-shaped guide rail, the sliding base can be connected to the surfaces of the T-shaped guide rails in a sleeved mode and is connected with the T-shaped guide rails in a sliding mode, the two ends of the T-shaped guide rails are jointly provided with a butt joint assembly, and walking assemblies are arranged on the two sides of the sliding base. A top shell is fixedly connected to the upper surface of the sliding base, and a harvesting assembly is installed on one side of the top shell. According to the harvester, the bottom plate, the T-shaped guide rails, the butt joint assembly, the sliding base, the walking assembly, the top shell, the harvesting assembly and the second motor are arranged, the T-shaped guide rails can be spliced through the butt joint assembly, and therefore the T-shaped guide rails with the appropriate length can be spliced according to the actual harvesting span, and the sliding base can move along the T-shaped guide rails through the walking assembly; according to the device, due to the fact that the T-shaped guide rails can be spliced, the harvesting range is wider.

The invention provides an illumination intensity detection vehicle based on a cross arm type, a cross arm type lifting module is arranged on a detection vehicle body, each cross arm group of the cross arm type lifting module at least comprises two or more stages of cross arms, and the adjacent stages of cross arms are a lower-stage cross arm and an upper-stage cross arm respectively. A containing space is arranged between the inner side lower-level cross arm and the outer side lower-level cross arm in the Y-axis direction, the upper-level cross arm is connected above the lower-level cross arm, the inner side of the inner side lower-level cross arm is connected with the lower end of the inner side upper-level cross arm, and the inner side of the outer side lower-level cross arm is connected with the lower end of the outer side upper-level cross arm. The upper-level cross arm is installed in the containing space of the lower-level cross arm when folded, the uppermost upper-level cross arm is connected with the detection execution module, and the lowermost lower-level cross arm is connected with the cross driving device. According to the invention, the cross arm type lifting module part is redesigned, the chassis span of the cross arm type lifting module on the Y axis is increased, the lowest lower limit height is reduced, and the lowest detection range is increased.

The discrete fractal structure of the quadric surface structure is divided into a Cartesian coordinate discrete structure and a polar coordinate discrete structure according to a discrete mode, the Cartesian coordinate discrete structure and the polar coordinate discrete structure each comprise an edge support, and a suspended approximation curve structure is connected to the upper portion of the interior of each edge support. The suspended approximation curve structure is connected with a discrete polyhedron, and the discrete polyhedron is connected with a quadric surface; wherein the suspended approximation curve structure in the Cartesian coordinate discrete structure form is composed of a multi-stage approximation curve structure and an intersection approximation curve structure, and the suspended approximation curve structure in the polar coordinate discrete structure form is composed of a multi-stage approximation curve structure, a fractal unit structure and a surrounding polygon structure; the multi-stage approximation curve structure, the intersecting approximation curve structure, the fractal unit structure and the surrounding polygon structure are manufactured through a multi-stage approximation suspension 3D printing method, and efficient suspension forming of the quadric surface structure is achieved.

The invention belongs to the technical field of building construction, and particularly relates to a heat preservation and sound insulation structure integrated assembly type composite floor slab which comprises a floor slab body, the upper end of the floor slab body is fixedly connected with a plurality of rectangular connecting pieces distributed in an array mode, and a hollow layer playing a heat preservation and insulation effect is arranged in the floor slab body. Ventilation steel pipes communicating with the outside are embedded in the inner walls of the two sides of the hollow layer. The adjusting assembly is used for adjusting the heat preservation and insulation effect of the hollow layer according to the external temperature. By arranging the adjusting assembly, the ventilation rate of the ventilation steel pipe can be adjusted according to the temperature change, and therefore the heat preservation effect is adjusted according to the change of the air convection speed; by arranging the self-adaptive sound insulation assembly, the electric field intensity on the peripheral side of the deformation sound absorption part can be adjusted according to the external sound pressure condition, and the sound insulation effect is adjusted by changing the deformation degree of the deformation sound absorption part.

The present invention relates to the field of photovoltaic technology, and provides a photovoltaic flexible bracket and a photovoltaic power station, comprising columns, a plurality of the columns being arranged at intervals on a base surface, the plurality of the columns comprising two first side columns; a first beam installed on the top of each of the first side columns; a flexible support body arranged between the two first beams, the flexible support body comprising at least two load-bearing cables; a rigid support body arranged on a side of each of the first beams away from the flexible support body, the flexible support body and the rigid support body forming a carrier of a photovoltaic component. The photovoltaic power station comprises the photovoltaic flexible bracket. The present invention has an ingenious design and a novel structure, and can effectively solve the technical problems in the prior art that photovoltaic panels are easy to flip over, edge columns and components thereon are easy to deform greatly, or even damaged, and can improve space utilization and power generation income, and has a very significant promotional significance.

The present invention provides a virtual laser radar system and method based on mutual early warning of wind turbines, including: a wind farm deployment data module, which obtains the front and back relationship of wind turbines arranged at intervals in the main wind direction in the wind farm; a wind speed transfer characteristic module, which obtains the transfer characteristic of the wind speed in the main wind direction in the area where the wind farm is located; a wind farm operation data module, which obtains the actual operation data of the wind farm; and a neural network module, which captures the wind speed relationship between wind turbines according to the front and back relationship of wind turbines arranged at intervals in the main wind direction in the wind farm, the transfer characteristic of the wind speed in the main wind direction, and the wind farm operation data, so as to replace the physical laser radar to predict gusts.

The application discloses an openable explosion venting hatch cover structure for a hydrogen-containing cabin of a sea platform and a manufacturing and mounting method, and the explosion venting hatch cover structure is composed of a steel frame, an upper layer of profiled steel plates, a lower layer of profiled steel plates, a fireproof layer, a deck connecting structure and a ridge sealing structure. The hatch cover structure is higher than a deck plane as a whole, a hatch cover top surface adopts bidirectional pitching, a slope is not less than 5%, and a hatch cover structure steel frame bottom surface is horizontal. The hatch cover structure is formed as a whole through the steel frame, can be used as a roof lifting cover, has the advantages of overall lifting, overall dismounting and convenience for hoisting cabin equipment. The hatch cover structure is provided with the fireproof layer between the two layers of profiled steel plates, has the explosion pressure relief function and the fireproof function. The application solves the problems of rapid disintegration of the hydrogen-containing cabin hatch cover and pressure relief in the cabin, has the structural functions of being able to bear typhoon load, fireproofing, water sealing and the like, has the advantages of being openable, small damage to adjacent facilities, independent manufacturing, installation and maintenance and the like.

The utility model discloses a rear module framework suitable for a PHEV chassis, the chassis and a vehicle. The rear module framework of the chassis comprises a rear auxiliary frame, and reinforcing ribs in bilateral symmetry are arranged on cross beams and longitudinal beams of the rear auxiliary frame; bushings are arranged at the positions of four connecting joints of the rear auxiliary frame and a vehicle body, three suspension supports are arranged on the rear auxiliary frame, the three suspension supports are of hollow structures, and flanges are arranged at the edge positions of the three suspension supports. According to the rear auxiliary frame, the suspension supports of the rear auxiliary frame are optimized, the three suspension supports are hollowed out and flanged, the weight is reduced, the rigidity is improved, and meanwhile reinforcing ribs are arranged on the suspension supports to guarantee the strength of the rear auxiliary frame.

The present invention relates to a combined roof truss of a beam string and a cantilever truss and a construction method, comprising a beam string assembly and a cantilever truss assembly mounted on both sides of the beam string assembly; the beam string assembly comprises two beam string main beams in an arc-shaped structure, a plurality of beam string main beam support rods are transversely mounted between the two beam string main beams, and two support connecting frames that can be connected on the same plane are respectively arranged at the left and right ends of the two beam string main beams; the two sides of the two support connecting frames are respectively fixed on the cantilever truss assembly; the present invention has a simple structure and an ingenious design, and a combined roof truss between the beam string assembly and the cantilever truss assembly is a new design for the building roof, which increases the roof area above the columns, and at the same time, the beam string and the cantilever truss use the supports as fulcrums to borrow force from each other, which saves materials and meets the needs of modern building development, and is a new roof truss combination system.

The utility model discloses a spliced luminous computer cooling fan which comprises a rectangular frame body, a positioning groove is formed in the bottom wall and / or the top wall of the rectangular frame body, and the positioning groove is matched with the inner circumference of the rectangular frame body in shape. A positioning frame is detachably mounted in the positioning groove, and the positioning frame and / or the rectangular frame body are / is made of a light guide material. The fan shell is divided into two modules, namely the rectangular frame body and the positioning frame, and the positioning groove is directly formed in the rectangular frame body, so that the fan shell can be made of two materials with different colors or different light guide degrees during injection molding, and a preset light irradiation effect can be realized when the fan is mounted or mounted at the position of an RGB (Red, Green and Blue) lamp; according to the fan shell, splicing of two structures is adopted, the production cost is effectively reduced, meanwhile, the span of the positioning grooves is large, the structural stability of the fan shell can be achieved, and the light radiation range can be widened; and positioning grooves can be formed in the bottom wall or the top wall of the rectangular frame body, so that the light source coverage range is wider.

A detection device for batch detection of insulator electrical breakdown comprises a bracket and a cross bar arranged on the bracket, a plurality of hooks for hanging insulators to be detected are distributed along the cross bar, and each hook corresponds to a discharge indicator. The present invention arranges a discharge indicator under each insulator. During the test, the grounding wire of the discharge indicator is grounded. When a certain insulator is electrically broken down, the armature indication area of ​​the discharge indicator will be moved away from the discharge indication window. Then, by observing whether there is an armature indication area in the discharge indication window, it is judged whether the insulator is electrically broken down. This realizes batch rapid detection of whether the insulator is electrically broken down, and greatly improves the detection efficiency.

The utility model provides a large-volume box-type underground concrete top plate, a plurality of foam core molds are arranged in the top plate in the direction of crossing an empty bin, a longitudinal bamboo grate framework is arranged on the outer side of each foam core mold, and a plurality of stirrups are arranged on the outer side of each bamboo grate framework for fixing. The utility model has the beneficial effects that the column type foam core molds are discontinuously placed in the top plate of the box type mechanism, and the longitudinal bamboo grate framework is tightly attached to the peripheral stirrups of the foam core molds to be fixed, so that the rigidity of the core molds is improved. The hollow top plate is arranged to reduce the self weight of the top plate, improve the bearing pressure of the cavity top plate and improve the stability of the box-type concrete underground road. And the use amount of steel bars and concrete is reduced, so that the cost is reduced. And moreover, the span is large, and the method is suitable for large-span and large-space buildings. The construction speed is high and the period is shortened. And the self structure has better stability and wide popularization prospect.

The invention discloses a prestressed large-span laminated slab with a prefabricated ECC bottom plate and a post-poured GRC laminated layer and a construction method of the prestressed large-span laminated slab. A prestressed large-span laminated slab with a prefabricated ECC bottom plate and a post-poured GRC laminated layer comprises a bottom plate and a post-poured layer, and the bottom plate is formed by integrally pouring an ECC material and a bottom plate stranded wire net composed of transverse stranded wires and longitudinal stranded wires; rectangular ribs are integrally arranged on the bottom plate and are formed by integrally pouring truss steel bars and the bottom plate; the truss steel bars and the bottom plate stranded wire net are bound through binding wires. Good crack control and dispersion capacity and higher toughness and ductility of the ECC-high-strength stainless steel stranded wires / SMA stranded wires are utilized, so that the bottom plate can be thinner, the self weight is reduced, the concrete dosage is reduced, and the span of the prefabricated laminated plate is increased; the rectangular ribs of the truss steel bar structure improve the rigidity, the shear capacity, the bearing capacity and the bending resistance of the bottom plate, so that the laminated plate can meet the requirements of a large-span structure and a high load.