58results about How to "Easy to disassemble and recycle" patented technology

The invention provides a grouting device which is high in construction speed, simple in structure, convenient to operate, high in efficiency and economical and a corresponding grouting method. The grouting device is characterized by being matched with a prefabricated pipe pile, and the grouting device carries out grouting after the prefabricated pipe pile is put into a pile hole with a larger diameter; the grouting device comprises an end plate which is used for sealing the bottom end of the prefabricated pipe pile, a grouting cushion chamber which is arranged in the end plate and is hollow inside, a grouting pipe, a plurality of grout outlet pipes, a plurality of reversing grout stopping valves and a plurality of end caps, wherein a grouting opening is formed in the upper end of the grouting pipe, and the lower end of the grouting pipe communicates with the grouting cushion chamber; the multiple grout outlet pipes are evenly arranged on the periphery of the grouting cushion chamber, a grout inlet of each grout outlet pipe communicates with the grouting cushion chamber, grout outlets can penetrate reserved holes in the side wall of the prefabricated pipe pile and face the space to be grouted on the outer side of the prefabricated pipe pile; the multiple reversing grout stopping valves are arranged on the grout outlet pipes correspondingly and stop grout from reversely flowing in the direction from the grout outlets to the grout inlets; and the multiple end caps block the grout outlets.

The objective of the invention is to provide a construction method for uplift piles. A detection uplift pile capable of providing a high pulling resistance can be formed fast and easily by the method. The construction method comprises the following steps of: 1) sinking outer tubes provided with a hollow steel tube on the inner wall to a designed depth; 2) putting an internal hammer in the outer tubes and hitting the internal hammer out of the outer tubes; 3) filling in the outer tubes with granular filling material in several times and squeezing the filled granular filling material with the internal hammer; 4) filling in the outer tubes with dry rapid-hardening concrete in several times and squeezing the filled dry rapid-hardening concrete with the internal hammer; 5) inserting steel bars separately into the outer tubes through the hollow steel tubes inside the outer tubes; 6) putting an inner tube in the outer tubes and an internal hammer in the inner tubes, and connecting the inner tubes with the internal hammers; 7) filling in the outer tubes with dry rapid-hardening concrete and squeezing the filled dry rapid-hardening concrete by hammering the inner tubes; 8) filling and squeezing repeatedly so as to make the steel bars spread outward and be wrapped and embedded in the dry rapid-hardening concrete; 9) perfusing granular material in the outer tubes; 10) using a steel connecting plate to fix the steel bars and a dowel steel of testing equipment with bolts separately; and 11) recycling the steel connecting plate and steel bars.

The invention discloses an in-situ rainfall infiltration and runoff distribution measuring system and an in-situ rainfall infiltration and runoff distribution measuring method, and belongs to the technical fields of hydrology, environmental science and geology. According to the technical means, the in-situ rainfall infiltration and runoff distribution measuring system comprises a rainfall measuring system, an infiltration measuring system and a runoff measuring system which are arranged in a testing area, wherein the rainfall measuring system comprises a rain gauge which is fixed in the testing area by virtue of a bracket; the infiltration measuring system comprises water sensors which are arranged in different depth positions of soil by virtue of section mounting pipes; the runoff measuring system comprises a water collecting pool, a flow collecting ditch and a water level and water quantity measuring device; the flow collecting ditch is excavated at the periphery of the testing area and communicated with the water collecting pool; the water level and water quantity measuring device is arranged in the connection position of the flow collecting ditch and the water collecting pool. The in-situ rainfall infiltration and runoff distribution measuring system and the in-situ rainfall infiltration and runoff distribution measuring method have the following advantages: the system is convenient to carry, quick in mounting, low in manufacturing cost, convenient and simple to use and maintain, and convenient to disassemble and recover after use; the error and environment limit of a laboratory are avoided and the result is truer and more accurate; the system can be arranged on different underlying surfaces and has a wide application range.

The invention discloses a mine tunnel supporting device, comprising an arched frame. A protective net is movably connected in the arched frame. The arched frame includes first modules, the top of eachfirst module is movably connected with a second module, the tops of the second modules are movably connected with a third module, and the top of the third module is movably connected with roof protection devices. Each roof protection device includes a threaded rod, a hexagonal slot is arranged in the bottom of the threaded rod, and a lower roof is arranged on the top of the threaded rod. A firstgroove is arranged in the middle of the bottom of each lower roof. Second grooves are arranged on the front and rear sides of the bottom of the lower roof, and the lower end of each second groove is fixedly connected with a stud. A first through hole is arranged in the middle of each stud, and the lower end of each stud is movably connected with a first screw. The protective net includes steel wires, a first connecting block is arranged at each of the T-shaped junctions of the steel wires, and a second connecting block is arranged at each of the cross junctions of the steel wires. The mine tunnel supporting device is convenient to assemble and disassemble during use without need for secondary processing, is highly compatible with the tunnel shape, and has a function of simple pipeline laying in jumper slots.

The invention relates to the field of building construction, in particular to a prefabricated concrete building connecting part,and specifically discloses a prefabricated building connection assembly.The prefabricated building connection assembly comprises an outer kit ina cast-in-place concrete layer, the outer kit isarrangedon the outside and between two prefabricated formworks, and the two ends of the outer kitabut against the inner side wall of the corresponding prefabricated formworks correspondingly; a tensioning screw is arranged in the outer kit in a matching mode, the two ends of thetensioning screw both penetrate out of the prefabricated formwork of the corresponding side in a movable mode,and a T-shaped solenoid is screwed on the tensioning screws on the outer sides of each ofthe prefabricated formworks correspondingly. By arranging the T-shaped solenoids at the two ends of the tensioning screws and two fastening members abutting the solenoids, the probability of the T-shaped solenoids rotating outwards and rotating out can be effectively reduced, the stability of connection is enhanced, and the outward moving risk of the formworks is reduced; at the same time the outer kit is arranged to facilitate the recycling of every other remaining component after a later period construction is completed, disassembly and recycling are convenient, and the reusing rate of thecomponents is increased.

The invention discloses a detachable polymer circulation box capable of being repeatedly recycled. The detachable polymer circulation box capable of being repeatedly recycled comprises a lower frame plate, a flame retarding plate, a mounting housing, a supporting rod, a telescoping frame and separating plates, wherein the flame retarding plate covers the middle part of the inner wall of the lowerframe plate in an adhering manner; the supporting rod is mounted in the mounting housing; and the separating plates are mounted at one side of the telescoping frame. The detachable polymer circulationbox capable of being repeatedly recycled is scientific and reasonable in structure, and safe and convenient to use; moving wheels are arranged and facilitate the moving of a circulation box body, andthus the circulation box body can be conveniently carried and moved; the separating plates are arranged, so that various goods can be stored in the circulation box body, and as a result, the utilization rate of inner space of the circulation box body can be increased; the supporting rod and a supporting bottom plate are arranged and are used for preventing the bottom part of the circulation box body from being in contact with a floor, so that moisture vapor at the floor is greatly prevented from entering the circulation box body through the bottom part of the circulation box body, and as a result, the goods in the circulation box body can be prevented from wetting and damage; the flame retarding plate and a flame retardant are arranged and are capable of inhibiting fire spreading in caseof fire in the circulation box body.

The invention relates to a wallboard mounting structure convenient to mount and dismount, and relates to the field of wallboard mounting, the wallboard mounting structure comprises a prefabricated wallboard, a ground keel fixedly connected to the ground, a ceiling keel fixedly connected to an indoor roof, and a plurality of vertical keels detachably connected between the ground keel and the ceiling keel. A first containing groove used for allowing the prefabricated wall plate to be embedded is formed in the upper side of the ground keel. A second accommodating groove for embedding the prefabricated wallboard is formed in the lower side of the ceiling keel. The number of the prefabricated wallboards is multiple, the two ends of each prefabricated wallboard are located in the first containing groove and the second containing groove respectively, the prefabricated wallboards and the vertical keels are distributed at intervals, and grooves allowing the prefabricated wallboards to be embedded therein are formed in the two opposite sides of each vertical keel. The wallboard has the effects that the mounting efficiency can be improved, construction waste generated in the mounting and dismounting process is greatly reduced, and later cyclic utilization of the wallboard is facilitated.

The invention relates to a foundation pit structure. The foundation pit structure comprises a foundation pit, wherein a supporting structure is mounted on the inner side wall of the foundation pit; the supporting structure comprises a supporting plate; the supporting plate is mounted at the peripheral side in the foundation pit; one side, away from the center of the foundation pit, of the supporting plate abuts against the inner side wall of the foundation pit; a water draining tube is arranged on the supporting plate; the water draining tube is hollow; the water draining tube is in threaded connection in the supporting plate in an inclined upward mode; the water inlet end of the water draining tube is inserted into the side wall of the foundation pit; the water draining tube extends to the peripheral surface of one side, towards the foundation pit, of the supporting plate, and is equipped with a locking part; a water draining ditch is formed in a position, below the water outlet end of the water draining tube, of the pit bottom of the foundation pit; a water pumping assembly for pumping out water in the water draining ditch is arranged in the foundation pit; and an isolating device is arranged at the peripheral side of the top surface of the side wall of the foundation pit. According to the scheme adopted by the invention, the water draining tube and the isolating device are arranged, so that the problems that a retaining baffle is low in recycling rate and water is easily accumulated on the side wall of the foundation pit can be effectively solved, and therefore, safety and stability of foundation pit construction are guaranteed.

The invention discloses a supporting device for forming a main cable of a suspension bridge of a space cable system and a using method of the supporting device. The supporting device comprises sleevehoops (1), a short supporting rod (2), a long supporting rod (3), a gasket (4), a stop block (5) and a counter-force frame (6), two main cables (8) are correspondingly fixed in the two sleeve hoops (1), each of the sleeve hoops (1) is composed of a semi-cylindrical convex gear sleeve hoop body (1.1) and a semi-cylindrical concave gear sleeve hoop body (1.2) which are mutually meshed, the convex gear sleeve hoop bodies (1.1) and the concave gear sleeve hoop bodies (1.2) are spliced into wholes through sleeve hoop bolts (1.3), one end of the short supporting rod (2) is fixed to the concave gearsleeve hoop bodies (1.2) which are arranged on one sides, and the other end of the short supporting rod (2) is sleeved with the tail part of the long supporting rod (3). According to the supporting device for forming the main cable of the suspension bridge of the space cable system and the using method of the supporting device, the defect that a temporary fixing device for the main cable of the suspension bridge of the space cable system does not exist in the prior art is overcome, and the technical problem that the suspension bridge of the space cable system undergoes main cable shaping in ancable finish stage is solved.

The invention discloses a fabricated truss girder steel beam tube structure system adopting full bolt connection. The fabricated truss girder steel beam tube structure system comprises truss girder units, stand column units and node units. Each truss girder unit comprises an upper chord member, a lower chord member and web members; the upper chord member and the lower chord member are connected together through the web members, and corresponding mounting holes are formed in the two ends of the upper chord member and the lower chord member; each node unit comprises middle node columns and middle node plates; the middle node plates are fixed at the upper and lower ends of the middle node column; each stand column unit comprises connecting columns and side node columns which are alternately arranged. The truss girder units are connected between the side node columns or between the side node columns and the middle node columns to form a truss layer. Side node plates are arranged at the upper end and the lower end of a side node column, the connecting plates are arranged at the upper end and the lower end of a connecting column, and the connecting plates are matched with the side node plates. According to the fabricated truss girder steel beam tube structure system adopting full bolt connection, the fabricated truss girder steel beam tube structure system adopting full bolt connection can be combined and assembled through full bolts, factory customization and modular construction are facilitated, on-site assembling is easy, the structure is convenient to disassemble, recycle and combine and assemble, and the fabricated truss girder steel beam tube structure system adopting full bolt connection can be repeatedly used.

The invention discloses the disposable suction type sputum suction apparatus for the neonatology department. The apparatus comprises a suction device. An input end of the suction device is movably connected with a switching device. A sputum storage tube is fixedly connected with the end, away from the suction device, of the switching device. A threaded through hole is formed in the side, away fromthe switching device, of the bottom of the sputum storage tube. A temporary storage bottle is in thread connection with the internal surface of the threaded through hole. A flexible cannula is movably connected with the side, away from the switching device, of the sputum storage tube. A spherical contact is fixedly connected with the end, away from the sputum storage tube, of the flexible cannula. A plural number of through holes are formed in the side, close to the spherical contact, of the external surface of the flexible cannula. The disposable suction type sputum suction apparatus for theneonatology department relates to the technical field of pediatrics medical treatment. According to the disposable suction type sputum suction apparatus for the neonatology department, because the front end of the apparatus is a soft component, it is beneficial for protecting the immature respiratory tract mucosa of a child patient; because the apparatus can be conveniently detached and recycled,the volume of the apparatus is reduced, and more importantly, the apparatus can be classified to be conveniently cleaned later; because the switching device is used for adjustment, it is avoided thatthe cannula is inserted more than one time; and because sputum is stored in the temporary storage bottle, it is avoided that sputum flows back and blocks the trachea.

The invention discloses a prefabricated floor slab, a detachable steel-concrete composite floor system and a construction method thereof, and relates to the technical field of constructional engineering. The prefabricated floor slab comprises a plurality of prefabricated slabs, reinforcers, a plurality of reinforcing pieces and reinforcing structures, wherein the prefabricated slabs are provided with lap joint sides and shear force sides, the lap joint sides of every two adjacent prefabricated slabs are detachably connected, and the shear force sides of every two adjacent prefabricated slabs are arranged at intervals; the reinforcers are arranged on the end faces of the shear force sides of the prefabricated slabs; the reinforcing pieces are arranged between every two adjacent reinforcers in a penetrating mode, and the plurality of reinforcing pieces are distributed in the vertical direction; and the reinforcing structures are poured between every two adjacent reinforcers. According to the prefabricated floor slab, the reliability in installation and use on a main structure can be guaranteed, and the prefabricated floor slab can be quickly and reliably removed from the main structure for repeated use.

The invention discloses an overall formwork system for a structure missing layer and a construction method thereof. The overall formwork system comprises an adhesion fixing device mounted on the nextfloor of the structure missing layer and a climbing-up formwork mounted on a permanent structure of a building and the adhesion fixing device. The adhesion fixing device comprises a plurality of vertical steel vertical columns placed on the next floor of the structure missing layer and provided with outwards-extending brackets at the tops, and a plurality of pieces of tying triangular steel arranged on the outwards-extending brackets in a one-to-one correspondence mode. A reversible pedal is arranged at the top of the climbing-up formwork, and a hoisting mechanism is arranged on the position,located on one side of the reversible pedal, of the top of the climbing-up formwork. The overall formwork system for the structure missing layer and the construction method thereof have the advantagesthat the adhesion fixing device is adopted to provide temporary support and force bearing points in the multi-time climbing-up process of the climbing-up formwork, and the climbing-up formwork is effectively fixed in the structure missing layer; and the reversible pedal and the hoisting mechanism are arranged at the top of the climbing-up formwork, and thus self-hoisting and recycling of the adhesion fixing device are achieved.

The invention provides a power battery residual value evaluation method, device and equipment, and a readable storage medium. The power battery residual value evaluation method comprises the steps of obtaining product data of a plurality of battery cores; grouping the plurality of battery cores based on the product data to obtain a target battery pack; and obtaining a nominal energy storage electric quantity value, a battery attenuation rate and an internal resistance consistency index of the target battery pack, and obtaining a residual value corresponding to the target battery pack by using a preset evaluation model based on the market value of the unit energy storage electric quantity. According to the invention, the residual value of the decommissioned power battery can be simply and effectively evaluated while the decomposed battery cores in the decommissioned primary battery pack are recombined, so that secondary utilization and disassembly and recovery of different power batteries can be better carried out.

The invention discloses a wave-groove-based crushing type electronic technology waste product disassembling and recycling device which comprises a box body. An observation window is arranged in the center of the upper portion of the front face of the box body, an operation panel is arranged below the observation window, discharging windows are formed in the upper portions of the two sides of the box body, and a feeding hopper is arranged in the center of the top of the box body; supporting columns are arranged at the two sides in the box body correspondingly, a partition plate transversely penetrates through the lower portion between the supporting columns, a movable corrugated folding plate is arranged at the top of the partition plate, a driving mechanism is arranged in the middle of the lower portion of the partition plate, power mechanisms are arranged at the two sides of the driving mechanism correspondingly, and angle-adjustable plates are arranged on the power mechanisms correspondingly; and the angle-adjustable plates are located between the supporting columns and the inner wall of the box body and located at the bottoms of the inner sides of the discharging windows, hollowed-out upper through holes are formed in the middles of the supporting columns, waste electronic products can be disassembled and recycled conveniently, and waste and environment pollution are avoided.

The invention belongs to the technical field of traffic control devices, and particularly relates to a folding intelligent traffic control box. The folding intelligent traffic control box comprises abase, a support and a box cover. The box cover comprises a top cover at the top, a plurality of functional skeletons are radially connected with the edge of the top cover, and the functional skeletonsare connected with the top cover through electric hinges. A fan is arranged in the top cover, a plurality of air outlets are formed in the edge of the top cover, functional cavities are formed in thefunctional skeletons, storage shafts are arranged in the functional cavities, the storage shafts are connected with fan-shaped awning tarpaulins, and the fan-shaped awning tarpaulins are further connected with unfolding shafts. First limiting grooves are formed in the left sides of the functional skeletons, second limiting grooves are formed in the right sides of the functional skeletons, and thesecond limiting grooves communicate with the functional cavities. The unfolding shaft in each functional skeleton is connected with the adjacent functional skeleton on the right side by a pull rope,and LED light strips are further arranged on the upper surfaces of the functional skeletons. The folding intelligent traffic control box is ingenious in structure, can be automatically stored and folded, and is convenient for the temporary construction and rapid installation of the traffic control box.

The invention provides a detachable cargo transportation tray structure applied to the technical field of logistics transportation equipment.The upper surfaces of tray panels (2) of the detachable cargo transportation tray structure are each provided with an extrusion positioning part, each extrusion positioning part comprises a positioning block (4) and an adjusting screw rod (5), the positioningblocks (4) are fixedly arranged on the tray panels (2), the adjusting screw rods (5) are screwed into and penetrate through screw holes in the positioning blocks (4), one end of each adjusting screwrod (5) is provided with an extrusion block (14), the adjusting screw rods (5) are screwed with positioning nuts (15), and tray connecting bases (3) are each provided with a first connecting hole (6)horizontally running through the tray connecting base (3). By means of the detachable cargo transportation tray structure, trays can be conveniently and rapidly assembled and detached, so that the trays can be connected and combined according to needs during transportation and can be conveniently detached and recycled after cargo transportation is completed, the cost is reduced, and meanwhile thesafety of the cargo transportation process is effectively improved.

The invention relates to a tree transplanting fixer and a tree transplanting method. The operation is normative, and the planting survival rate of nursery stocks is high; the fixation of the fixer totrees is firm; and damage to the crusts of the trees is reduced. The tree transplanting fixer comprises band pieces, wherein each band piece comprises a first plate body; each first plate body is bentand is in an arch shape; the inner wall of each first plate body is adhered to the surfaces of the trees; two ends of each first plate body are cocked to form two second plate bodies; a first throughhole is formed in each second plate body in a penetrating manner; a first bolt penetrates through the second plate bodies of two adjacent band pieces, and the second plate bodies of the two adjacentband pieces are fixedly connected by a first nut; a connecting block is connected to each first bolt; a penetrating second through hole is formed in the side wall of each connecting block; each firstbolt penetrates through the corresponding second through hole to be fixed; a first blind hole is formed in the bottom surface of each connecting block; a penetrated third through hole is formed in theside wall of each connecting block, and penetrates through the corresponding first blind hole; a fixing rod is inserted in each first blind hole; a fourth through hole is formed in each fixing rod; and a second bolt penetrates through each third through hole and the corresponding fourth through hole, and each second bolt, the corresponding third through hole and the corresponding fourth through hole are fixedly connected by a second nut.

The invention belongs to the technical field of livestock breeding equipment, in particular to a novel fence used for animal husbandry. The fence comprises a bottom board. The top of the bottom boardis fixedly equipped with a fixing seat. The top of the fixing seat is fixedly equipped with three shaft sleeves. Shaft grooves are arranged between the three shaft sleeves and the fixing seat. Vertical rods are arranged in the interiors of the shaft grooves. The vertical rods are equipped with multiple first screw holes and fixedly connected with the shaft sleeves through first bolts. Additionally, cross rods are arranged between the vertical rods. Two ends of each cross rod are rotatably connected with rod sleeves. The rod sleeves are arranged outside the vertical rods in a sleeved manner. The vertical rods are equipped with multiple second screw holes and fixedly connected with the rod sleeves through second bolts. The novel fence used for animal husbandry is stable in structure, easy ininstallation and operation, and reasonable in design and helps save a great deal of time and energy of workers. The overall structure has features of modularization and detachable splicing. Comparedwith the prior art, the novel fence enjoys advantages such as low cost and quick use.

The invention relates to the technical field of tunnel construction support, in particular to a novel modular temporary support assembly structure for a loess tunnel with an ultra-large cross section. According to the novel modular temporary support assembly structure for the loess tunnel with the ultra-large cross section, field assembly operation is realized through I-shaped steel, special accessories, bolt connection and the like, reutilization of materials is achieved, and the use cost is greatly reduced. The novel modular temporary support assembly structure comprises vertical supports, annular supports and a temporary inverted arch, the vertical supports are detachably connected through door-shaped structures and tensioning structures, the vertical supports are detachably connected with the annular supports, and the two ends of the temporary inverted arch are detachably connected with the vertical supports and the annular supports.

The invention provides a stud structure and a projector applying the same. The stud structure comprises a hollow bolt body, an adjusting part and a separation blade, wherein a first thread part is arranged outside the stud body; a second thread part is arranged inside the stud body; and the thread screwing direction of the first thread part is different from that of the second thread part. The adjusting part is arranged at one end of the bolt body; and the adjusting part is used for being matched with a detaching tool when the stud structure is detached. The separation blade is arranged between the adjusting part and the bolt body; and the cross sectional area of the separation blade is greater than that of the bolt body. According to the invention, the stud structure can be conveniently detached from an electronic product casing and recovering. In addition, with the design of the separation blade and the adjusting part at one end of the bolt body, the phenomenon that internal elements of the projector are damaged because a user uses an overlong screw to lock and attach to the projector can be avoided.

The invention relates to the technical field of a building component, in particular to a water stop screw rod. The water stop screw rod comprises a screw rod, three perforated water stop sheets, connecting rods and handles, wherein the three water stop sheets are tightly connected at the two ends and the middle position of the screw rod; the two ends of the screw rod are provided with sleeve heads connected with the screw rod through screw threads; when the sleeve heads are in a state of being connected with the screw threads of the screw rod, the water stop sheets are attached to the sleeve heads; each connecting rod is arranged on the corresponding sleeve head; a foam layer is arranged on the side surface of each sleeve head; and the handle is arranged on each connecting rod. The water stop screw rod has the beneficial effects that the material recovery of the connecting rods and the sleeve heads arranged on the water stop screw rods is simultaneously realized; and the cost is reduced.

The invention discloses an energy-saving adjustable cooling water pipe of a machine for making thin sheets of bean curd, and relates to the technical field of food processing. The energy-saving adjustable cooling water pipe of the machine for making the thin sheets of bean curd comprises a base, wherein a controller is fixedly connected to the front surface of the base, supporting columns are fixedly connected to two sides of the upper surface of the base, a top plate is fixedly connected to the top ends of the supporting columns, a driver is fixedly connected to one side of the upper surfaceof the top plate, a plurality of sleeves are fixedly connected to the side, close to the driver, of the upper surface of the top plate, a driving rod is installed inside the driver, and driven rods are connected to the interiors of the sleeves in a sliding mode. According to the energy-saving adjustable cooling water pipe of the machine for making the thin sheets of bean curd, a cooling pipe can slide along a containing box under the driving of a first electric telescopic rod, so that a user can conveniently adjust a cooling portion according to needs; meanwhile, through a first limiting rod,the stability of the cooling pipe during sliding can be kept; and meanwhile, a water inlet pipe is connected with an external cold water supply device and a hot water supply device, so that the user can conveniently change the cooling pipe according to needs.

The invention discloses a construction method of a roadway confined concrete top-supporting and side-protecting system. The problems that in the prior art, the roadway supporting cost is high, and recycling cannot be achieved are solved; and the construction method has the technological means that the construction speed is high, and roadway supporting materials can be recycled. The construction method of the roadway confined concrete top-supporting and side-protecting system is characterized in that two or more sets of top-supporting columns, side-protecting pieces and longitudinal connectingpieces are included; the tops of the top-supporting columns are used for supporting the top of a roadway, and the side parts of the top-supporting columns are provided with shaft sleeves; the side-protecting pieces are connected with the corresponding two adjacent sets of top-supporting columns, and one or two sides of the side-protecting pieces are provided with pin shafts matched with the shaftsleeves; and the longitudinal connecting pieces are arranged on one or two sides of the side-protecting pieces and connected with the corresponding two adjacent sets of top-supporting columns, or theside-protecting pieces and the top-supporting columns are fastened through the longitudinal connecting pieces.