51 results about "Circular arch" patented technology

The present invention provides a device for regulating the water temperature discharged from a reservoir. The device for regulating the water temperature discharged from the reservoir includes a power station intake tower, a cable-stayed tower, a support platform and a water retaining system. The cable-stayed towers are respectively arranged on both sides of the water inlet of the power station intake tower. The support platform is a horizontal circular arch, and both ends of the support platform are connected to the cable-stayed towers. The water retaining system is connected to the circular-arch-shaped support platform and extends downward to the lower part of the reservoir. The water retaining system includes columns, collar rings, a water retaining curtain and a hoist. A plurality of collar rings are sleeved on the columns. The water retaining curtain is connected to the support platform and the plurality of collar rings. The hoist is connected to the upper collar ring. By arranging the cable-stayed towers on both sides of the water inlet of the power station intake tower, the present invention realizes the technical solution of implementing the water retaining system on a single-side bank slope, without blocking the main river channel, and the flood discharge condition does not need to bear the flood load.

The utility model discloses a large span concrete filled steel tube arch bridge arch rib bridge location installation butt joint structure, which comprises an arch rib and a flange plate fixedly connected at the end part of the arch rib, the arch rib comprises a chord pipe and a plurality of rib plates fixedly connected inside the chord pipe, the flange plate is fixedly connected at the end parts of the rib plates, the flange plate is fixedly connected with a first sleeve in a circular truncated cone shape, and the first sleeve is fixedly connected with a second sleeve. When the arch ribs are in butt joint, the small ends of the circular truncated cones of the first sleeves on the two arch ribs are arranged at the two ends of the second sleeves in a penetrating mode respectively, the second sleeves are internally provided with circular truncated cone-shaped inner cavities matched with the first sleeves in appearance, and the outer walls of the chord pipes are fixedly connected with a plurality of connecting plates used for hanging dragging hoists. The first sleeve and the second sleeve are arranged, the pulling block is arranged to adjust the spatial position of the arch rib, alignment and sleeving of the arch rib are facilitated, the anti-shearing and anti-bending section is larger, the stress strength is higher compared with an existing mode that a flange plate is connected through a bolt, the safety in the construction process of a large-span arch bridge can be greatly improved, and the construction efficiency is improved. The construction cost is reduced.

The invention discloses a double-layer three-center circular-arch-shaped subway station structure which comprises an arch-shaped top plate, two side walls connected with the two ends of the arch-shaped top plate respectively, a middle plate arranged between the two side walls and a bottom plate arranged at the bottoms of the two side walls, and the middle plate divides the subway station structure into an upper layer and a lower layer; the arch-shaped top plate is a three-centered circular arch-shaped top plate, two arches connected with the two side walls are tangent to the corresponding side walls respectively, and the rise span ratio of the arch-shaped top plate is 0.15-0.4. The problems that a rectangular subway station is poor in structural stability, low in space utilization rate, high in long-term maintenance cost and poor in attractiveness can be solved.

The utility model discloses a high-temperature cracking shaping tool for a ceramic-based composite sheet, relates to the technical field of ceramic-based composites, and can solve the problems that a shaping tool in the prior art cannot shape a product at one time and is troublesome to disassemble and assemble. The high-temperature cracking shaping tool for the ceramic-based composite sheet comprises an upper die and a lower die which are detachably connected, and the upper die comprises a cover plate and a first forming structure arranged at the bottom of the cover plate; the lower die comprises a base and a containing groove formed in the center of the top face of the base, and the bottom of the containing groove is provided with a second forming structure used for being matched with the first forming structure to enable the circular arch structure of the ceramic-based composite to be formed.

The invention relates to a water jet tunneling method suitable for a five-center dome structure tunnel. The water jet tunneling method comprises the following steps that S1, a jet cutting pre-experiment of a cutting area under a tunnel face is carried out according to tunnel design; s2, measuring the cutting depth D under different jet parameters; s3, according to the cutting depth D, cutting parameters are determined, and a cutting circuit diagram is designed based on the cutting parameters; s4, cutting operation is conducted on the lower cutting area according to the cutting circuit diagram; and S5, cutting operation is conducted on the upper cutting area according to the cutting circuit diagram. According to the method, efficient, accurate, safe and reliable tunneling of the tunnel of the five-center circular arch structure is achieved, the construction quality can be improved, adaptability is enhanced, and the construction cost is reduced.

The utility model discloses an anti-loosening disc spring which is a chamfered-edge conical elastic gasket, commonly known as a chamfered-edge disc spring (13) and comprises a conical gasket, a ring top (12) is smaller than a ring bottom (14), the ring top (12) and the ring bottom (14) are circular, the circle center of the ring top (12) and the circle center of the ring bottom (14) are connected through a coaxial line (21), the diameter of the ring top (12) is larger than that of a screw rod (4), and the diameter of the ring bottom (14) is larger than that of the ring top (12). The shaft (21) is perpendicular to the collar top (12) and the collar bottom (14). The disc spring is characterized in that the round edge of the ring bottom (14) is provided with at least one chamfered round flaw arch door (24), or a guide chamfered arch door (25) is chamfered to form an asymmetric chamfered disc spring (26), and the disc spring creeps in one direction and is self-tightened and prevented from loosening during vibration. The axial section line of the outer conical surface (15) is in a straight line shape (23), or in an outward convex arc shape (19), or in an inward convex arc shape (20). The anti-loose disc spring (11) is simple in structure, easy to produce, low in cost, good in anti-loose performance, convenient to install and capable of being used repeatedly.

The application relates to the technical field of landscape bridges, and discloses a circular-rib arch bridge and an arch bridge construction method, which comprises arch bridge units, each of which comprises an arch bridge main frame and an arch ring assembly arranged above the arch bridge main frame; the arch bridge main frame comprises a first base, curved beam parts symmetrically arranged at two ends of the first base and cross beam parts, one end of each curved beam part is fixedly connected with the first base, the other end is connected with a cross beam part, a bridge deck is arranged between the two cross beam parts, and each cross beam part is provided with a second base for supporting the cross beam part at an end away from the curved beam part along a second direction; and the first base comprises two bearing platforms, and a main arch ring is arranged between the two bearing platforms; the arch ring assembly is symmetrically arranged at two ends of the main arch ring along a first direction, the arch ring assembly comprises a main circular arch and secondary circular arches arranged at two ends of the main circular arch along the first direction, the bottom end of the main circular arch is fixedly connected with the bearing platform, and one end of each secondary circular arch is hingedly connected with the main circular arch.

The present invention discloses a modeling method for a parametric model of a circular arch straight wall type top arch component, comprising the following steps: creating a model of the circular arch straight wall type top arch; defining input parameters of the model graphics and logical operation parameters between the input parameters, wherein the logical operation parameters are used to implement constraint relationships between geometric figures constituting the model; and defining model output quantities of the model, wherein the model output quantities include: model volume, top arch segment surface area, related support quantity, and excavation quantity. According to the above technical solution, the "family" function of Rev it software can be used to complete the creation of a parametric three-dimensional model of a circular arch straight wall type top arch component of an underground cavern. By secondary processing of the BIM model information, automatic statistics of related engineering quantities can be achieved, thereby solving the problems of low efficiency in family modeling of irregular cavern top arch types and low application of model information in Rev it software.

The present invention discloses a method for reinforcing an H-shaped steel truss arch of a corrugated steel plate circular arc arch bridge, which relates to the technical field of traffic engineering construction, comprising the following steps: cold-bending multiple sections of H-shaped steel and extending them to form a semicircular arc-shaped H-shaped steel truss arch; lining an H-shaped steel truss arch in the middle of each circumferential plate width of the corrugated steel plate circular arc arch, with the two edges of the upper flange of the H-shaped steel truss arch completely contacting the two sides of the inner trough of the corrugated steel plate circular arc arch; A hard rubber pad is pasted between the gap formed by the contact between the upper flange and the trough on the inner side of the corrugated steel plate circular arc arch bridge; a lining steel plate is set on the corrugated steel plate circular arc arch seat at the arch foot of the H-shaped steel truss arch to support the arch foot of the H-shaped steel truss arch on the lining steel plate; a steel strip connecting belt is set along the transverse corrugation direction at the cross section of the arch crown, arch shoulder, and arch foot of the H-shaped steel truss arch to connect the multiple H-shaped steel truss arches under the arch of the corrugated steel plate circular arc arch bridge into one. The present invention forms a steel truss arch by lining the corrugated steel plate circular arc arch bridge with H-shaped steel, reinforces the corrugated steel circular arc arch bridge, makes it less likely to deform when subjected to radial compression, maintains or improves the load bearing capacity, and extends the service life of the corrugated steel plate arch bridge, with good results.

The application relates to the technical field of tunnel construction, and discloses a tunnel initial support shotcrete flatness adjusting device and a construction method, the device comprises a circular arch beam track, a moving assembly sliding along the circular arch beam track, and at least two arc-shaped baffles; the space between the arc-shaped baffles and the inner wall of the tunnel serves as a shotcrete operation space; the moving assembly is respectively provided with a supporting rod capable of driving the arc-shaped baffles to move and a concrete shotcreting arm facing the shotcrete operation space. Through the cooperation of the above components, the arc-shaped baffles can alternately adhere to the inner wall of the tunnel under the action of the supporting rods, concrete is shotcreting in the shotcrete operation space, the shape of the concrete is effectively limited, the concrete is initially set and formed in the shotcrete operation space, the shotcreting concrete has excellent flatness during the overall construction, and the construction efficiency is remarkably improved.

Cooling module (1, 19, 29) for a gearbox (40), wherein the cooling module (1, 19, 29) comprises a cast part, wherein a space (9, 34) is provided in the casting for flowing coolant, wherein cooling fins (3, 32) and / or cooling fingers (20) are attached to the casting, which are directed into the interior of the gearbox and are formed in one piece with the casting or welded to the casting, and the longitudinal profile of the cooling fins (3, 32) and / or the ends of the cooling fingers (20) of the shape of a rotating part (45, 46) of the gear (40) follow at least two imaginary arc-shaped lines (4, 5, 6) which are separated from each other by the points of intersection (7, 8, 22, 23) of the arcs, and where the radii of the circular arcs are determined by the radii of the rotating parts (45, 46).

The invention relates to the technical field of tunnel engineering lining construction equipment, in particular to a device for grabbing a large-tonnage arc tube piece type prefabricated lining, which comprises a circular arch beam track arranged on a trolley and a servo trolley sliding along the circular arch beam track, the servo trolley comprises a trolley body and a grabbing mechanism, the grabbing mechanism comprises an arc-shaped flitch plate and a lead screw lifting machine which is arranged at the corner of the trolley body, independently controlled and hinged to the inner arc face of the arc-shaped flitch plate, the curvature of the plate face of the arc-shaped flitch plate is matched with the curvature of the inner wall of the arc prefabricated lining segment to be grabbed, and a hydraulic fixing pin is further arranged on the arc-shaped flitch plate. Large-area rigid contact type grabbing of the large-tonnage prefabricated lining segments is achieved through cooperation of the arc-shaped flitch plates and the hydraulic fixing pins, the prefabricated lining segments can be stably conveyed to the mounting position through cooperation of the circular arch beam track and the servo trolley, then the mounting position is finely adjusted through the lead screw lifting machine, and the working efficiency is greatly improved. The problems that in the prior art, when large-tonnage prefabricated lining segments are grabbed, the large-tonnage prefabricated lining segments shake easily, and the installation precision is uncontrollable are solved.

TITLE: METAL-TEXTILE TYPE BUILDING STRUCTURE One aspect of the invention relates to a metal building structure 1 comprising a mast 2 extending longitudinally along a principal vertical axis X and a framework 3 comprising: A first generally circular arch 4 coaxial with said mast 2; A plurality of framework elements 5 arranged around said mast 2, each framework element 5 extending radially between said mast 2 and said first arch 4, each framework element 5 comprising: A straight beam 6 perpendicular to said principal axis X and extending between said mast 2 and said first arch 4; A curved beam 7 arranged opposite said straight beam 6 and extending between said first arch 4 and an upper end 8 of said mast 2. Figure to be published with the abbreviation: Figure 2

This utility model provides a protective device for outdoor electrical cabinets, relating to the technical field of protective devices. It includes an electrical cabinet with two sets of openings (top and bottom). Supporting members are located at the four corners of the bottom of the cabinet, each member being a downward-opening semi-circular arch. Inner corner frames are provided at the internal corners of the cabinet, and outer corner frames are provided at the external corners. An opening frame is provided at the front opening of the cabinet. This utility model can prevent the electrical cabinet from becoming damp and deformed due to rainwater intrusion, as well as from being corroded, thus preventing it from affecting its quality and lifespan. It can also prevent prolonged exposure to sunlight, preventing damage to the electrical components inside the cabinet. This solves the problem of existing electrical cabinets lacking protective devices and being easily corroded.

The invention relates to a semicircular arched full-section roadway excavation device which is used for excavating a round-section roadway into a semicircular arched-section roadway. The semi-circular arch-shaped full-section roadway excavation device comprises a hob milling and excavating assembly which comprises a milling and excavating hob which extends transversely and can rotate, and the milling and excavating hob cuts arc-shaped side walls on the two sides of a round-section roadway into vertical side walls of the semi-circular arch-shaped section roadway; the gangue collecting assembly is arranged behind the hob milling and excavating assembly, extends forwards in the axial direction and is unfolded towards the outer side of the hob milling and excavating assembly, and the gangue collecting assembly collects gangue cut by the hob milling and excavating assembly to an arc-shaped bottom arch of the round-section roadway; and the bottoming and compacting assembly is arranged behind the gangue collecting assembly, the bottoming and compacting assembly is provided with a rolling element capable of continuously rolling, and the gangue in the arc-shaped bottom arch is compacted and flattened. The hob milling and excavating assembly excavates a circular roadway into a semicircular arch shape, the gangue collecting assembly and the bottoming and compacting assembly fill and level up an arc-shaped bottom arch of the roadway, and one-time forming of the semicircular arch-shaped section roadway is achieved.

The present invention relates to a hyperbolic steel corrugated plate shell concrete combined arch-type highway-railway overpass, the overpass including an arch ring arranged on a railway line, the arch ring being a steel plate concrete composite load-bearing arch ring structure composed of an arch ring steel plate frame and concrete poured on one side of the arch ring steel plate frame; the arch ring steel plate frame is formed by arranging and splicing a plurality of hyperbolic curved steel corrugated plate shells in a matrix, the arched sides of the steel corrugated plate shells being spliced ​​with a steel bar frame; the steel corrugated plate shells are formed by rolling a flat steel corrugated plate with upwardly extending plate teeth on both sides, and then bending the plate shells twice to form upwardly curved circular arch waves in the transverse direction, and to produce an arch deformation with the same curvature as the arch ring in the longitudinal direction. The overpass structure of the present invention has great compressive and bending rigidity and deformation resistance, without the need for an under-arch support, and has a simple construction process, a short construction period, and a low cost.

The invention relates to the technical field of tunnel construction, and discloses an inverted arch and inverted arch filling synchronous pouring device, method and system. The formwork device comprises a steel formwork, and the steel formwork comprises an operation platform plate and a circular-arch-shaped formwork. The steel formwork is slidably erected between the two guide rails in a suspended mode, and an inverted arch pouring cavity is formed by the circular-arch-shaped formwork and a spaced rock layer below the circular-arch-shaped formwork. The inverted arch pouring device comprises at least two inverted arch hoppers; the inverted arch filling and pouring device comprises at least one inverted arch filling hopper, a discharging port of the inverted arch filling hopper is formed in a rear end plate of the steel formwork, the inverted arch top face serves as a bottom formwork, the rear end plate serves as a side formwork, and an inverted arch filling and pouring cavity is formed by an opening in the upper portion. According to the synchronous pouring system and the synchronous pouring method, the problems that the construction difficulty is high, the construction efficiency is low and the connection tightness of the two parts is poor when the inverted arch and inverted arch filling are sequentially constructed are solved.

The invention discloses a gearbox high-speed-level vibration mode testing device and a testing method, and relates to the technical field of gearbox production testing, the gearbox high-speed-level vibration mode testing device comprises a testing table, the testing table is arranged to be a horizontal workbench, a linear sliding groove of a linear structure is formed below a testing opening, a sliding seat is slidably connected in the linear sliding groove, and the sliding seat is arranged in the testing opening. A gear box is installed at the top end of the sliding seat and horizontally slides in the testing opening through a linear sliding groove. The testing port is of a semicircular arch structure, a gear box is convenient to install and easy to automatically move, a linear sliding groove of a linear structure is formed below the testing port, a sliding seat is slidably connected into the linear sliding groove, the gear box is installed at the top end of the sliding seat, and the gear box horizontally slides in the testing port through the linear sliding groove. Axial reciprocating sliding of the gear box can be achieved through the linear sliding groove, and receding can be conveniently conducted in the mounting and dismounting process.

The utility model discloses a large-dip-angle coal seam transportation roadway surrounding rock geological supporting structure which is characterized in that 11 anchor rods with the diameter being 20 * 2500 mm are constructed in each row, the row spacing is 850 * 850 mm, 9 anchor rods are arranged on a semicircular vault part, one anchor rod is arranged on each of the left side and the right side of a straight wall part, the bottommost anchor rods are arranged downwards at the angle of 5-10 degrees with the horizontal line, 5 anchor cables are constructed in each row, the row spacing is 1700 mm, and the anchor rods are arranged in the row. Wherein the number of the semicircular arch crown parts is three, the specification is phi 21.6 * 7300 mm, and the spacing is 1800 mm; the straight wall part comprises a left side and a right side, the distance between the straight wall part and the bottom plate is 600-800 mm, and the specification of the straight wall part is phi 21.6 * 4300 mm. According to the supporting structure, a better supporting effect can be effectively achieved on the roadway surrounding rock failure evolution rule, roadway surrounding rock deformation control is effectively achieved, the section area utilization rate is increased, and the supporting economical efficiency is better.

The present invention is provided with a mouth part (2), a shoulder part (3), a main body part (4), and a bottom part (5), the main body part (4) having a substantially square tubular shape, the shoulder part (3) having a shape continuously connecting the mouth part (2) and the main body part (4), and the main body part (4) being provided with a specific portion (42) on at least a part thereof. The shoulder portion (3) has a specific portion (42) having a shape that can form a parallelogram in which the interior angle is not a right angle when two sets of opposing sides on the cross-section of the main body portion (4) are extended, and the shoulder portion (3) has a circular arch-shaped bead (31) between two vertex portions that are, in the vertex portions in a plan view, in which the interior angle of the bead (31) is larger than the interior angle of the bead (31), and the interior angle of the bead (31) is larger than the interior angle of the bead (31). And two apex portions located directly above the apex of the acute angle of the parallelogram in the specific portion.

This disclosure relates generally to a payload separation system utilizing a circular arch connective mechanism for connecting and releasing a payload from a launch vehicle. The apparatus of the invention is particularly useful for spacecraft and other vehicular separation mechanisms.

The utility model relates to a hidden laminate support. The hidden type shelf board support comprises a bearing body and a connecting piece, the bearing body is used for being installed on a vertical board, and the connecting piece is used for being installed on a shelf board; the bearing body comprises a first arch-shaped part and a second arch-shaped part which are fixedly connected, the first arch-shaped part is arranged on the upper side of the second arch-shaped part, an opening of the first arch-shaped part is opposite to an opening of the second arch-shaped part, and the first arch-shaped part and the second arch-shaped part are both circular arches. The radius of the first arch-shaped part is greater than that of the second arch-shaped part; the first arch-shaped part is provided with a guide connecting plate matched with the connecting piece, the second arch-shaped part is provided with a U-shaped clamping groove matched with the connecting piece, and a first convex block and a second convex block matched with the connecting piece are symmetrically arranged on the upper side of the U-shaped clamping groove. The hidden type shelf board support is simple in structure and convenient to install, and shelf boards can be installed more stably.

The present invention discloses a method for making arch bricks in industrial furnaces, which includes the following steps: 1) determining the type and quantity of refractory bricks for making arch bricks; 2) preparing the arch formwork by carpenters; 3) on-site masonry by furnace builders. Step 1) specifically includes the following contents: A. According to the type of a certain refractory brick, determining the smallest diameter circular arch that can be built; B. According to the combined type of refractory bricks and the central angle of the arch, determining the span of the arch that can be built; C. According to the span of the arch, determining the selected type of refractory brick; D. According to the degree of the central angle of the arch and the span L of the arch, obtaining the height h of the arch; E. According to the span of the arch, the degree of the central angle of the arch, the masonry thickness of the arch, and the combination of refractory bricks, determining the type and quantity of refractory bricks. The present invention can shorten the material selection and construction time, bring great convenience to industrial furnace construction personnel, improve the design, installation and construction efficiency, reduce the labor intensity of construction personnel, ensure the construction and installation accuracy, and improve the design, installation and construction quality.

This disclosure relates generally to a payload separation system utilizing a circular arch connective mechanism for connecting and releasing a payload from a launch vehicle. The apparatus of the invention is particularly useful for spacecraft and other vehicular separation mechanisms.

According to the building method of the circular-arch-shaped tying glass brick partition wall, the steel frame is adopted for manufacturing the circular-arch-shaped door opening base layer model, the front vertical face is welded with the L-shaped stainless steel hanging pieces to be tied in the glass brick building gaps, the required decoration effect can be achieved, and meanwhile the requirement for stability and firmness of overall installation can be met. According to the building method, circular arch partition wall building of the transparent glass bricks can be achieved, stability and firmness of the partition wall can be guaranteed while the attractive effect is achieved, the building method can be applied to a circular arch structure or a laminated wall structure system with the glass bricks as veneers, the problem that stability is insufficient when the building height is large can be solved, and the building quality is improved. And even the building requirement of the circular arch door opening partition wall can be met.

The utility model provides an underground air storage cavern for compressed air energy storage, which comprises an existing cavern body with a three-centered circular arch at the top, and is characterized in that two circular steel linings which are arranged up and down or left and right are arranged on the inner side of the existing cavern body; and a concrete lining is filled between the circular steel lining and the existing cavern body. And according to the size of the section of the existing cavern, backfilling and sealing are conducted, and two circular tunnel type compressed air reservoirs are formed. The whole structural form meets the circular ring form of a conventional steel lining, the material manufacturing and construction cost of the special-shaped steel lining is reduced, expanding excavation is not needed for transformation, and the problem of disturbance instability of the cavern is solved. The utility model is suitable for the conditions that the section size of the existing cavern is larger and the stability of surrounding rock is better.

The utility model discloses a self-righting inflatable life raft, which relates to the technical field of rescue devices and comprises a raft body, two inflatable keels are arranged on the top surface of the raft body, two sides of each inflatable keel are connected with two sides of the raft body, and the inflatable keels are isolated from an inner cavity of the raft body; rotating seats are arranged on the two sides of the raft body, and flexible supports are rotatably arranged in the rotating seats; connecting cylinders and connectors are arranged at the ends, close to each other, of the flexible supports on the two sides respectively, and the supports on the two sides are fixedly connected through the connecting cylinders and the connectors to form a circular arch shape; tent covering cloth is arranged on the top faces of the circular-arch-shaped flexible supports and the top faces of the inflatable keels. The inflatable keel is arranged, the inflatable keel is isolated from an inner cavity between the raft body, and therefore the inflatable keel can be independently inflated; and when protection is not needed, the space of the top face of the raft body is not increased by inflating the inflatable keel, and the internal space size of the tent covering cloth can be increased through the arrangement of the flexible support.

A multi-part last that can be disassembled in a gently manner, comprising a front portion (20), a rear portion (30), and a wedge portion (40), wherein the bottom of the front portion has a rearwardly extending projection (21), the bottom of which forms part of the bottom of the last (10), which ends in a rear support (22) having an end forming a first circular arch (23), and the front portion is partially open at the top, has a partially open and partially closed cavity (27) shaped in the form of a second circular arc (26), and the lower portion of the rear part has a front face resting on the circular arc of the rear support, and in addition the rear part has a locking projection (34) introduced into and terminating in said cavity, the front and upper faces of which are curved in said second circular arc, and a part of the last (10), when assembled, rests against the concave inner wall of the cavity, which is curved in accordance with the second circular arc, and the wedge part has a shape that fits in a cavity formed between sections (31, 32) forming the frontal surface of the rear part and sloping downwards from above, and sloping lower and upper wedge sections (28, 29), of the front part, wherein said circular arcs are concentric with each other and have their centers (O) at or below the line of the bottom of the last, and the assembled last can be removed from the front part by partial rotation of the rear part about the center after removal of the wedge.

The utility model relates to the technical field of circular arch greenhouses, in particular to a rainproof top windowing system of a circular arch greenhouse, which comprises a plurality of groups of first frameworks and a plurality of groups of second frameworks, and the plurality of groups of first frameworks are fixedly connected with the plurality of groups of second frameworks; covering films are arranged on the upper sides of the multiple first frameworks and the multiple second frameworks, a rain shelter is installed at the upper ends of the multiple first frameworks, stand columns are installed on the upper sides of the upper ends of the multiple second frameworks and the lower side of the rain shelter in a front-back symmetry mode, and a dustproof net is installed between the two stand columns. The upper ends of the first frameworks are fixedly connected with the upper ends of the second frameworks, the rain sheltering shed is installed on the first frameworks, and when the skylight on the top of the circular arch greenhouse formed by connecting the first frameworks and the second frameworks is punched, rainwater is folded through the rain sheltering shed and the dustproof net, so that the skylight on the top of the circular arch greenhouse is folded; rainwater drifting caused by opening of the skylight in rainy days is avoided, and opening of the top of the circular-arch greenhouse in rainy days is facilitated.