240results about "Arched structures" patented technology

The invention provides a method for constructing an arch-shaped large-span shell steel roof, and belongs to the technical field of arch-shaped large-span shell steel roof construction. A temporary supporting system is built, and distributed optical fiber sensors are arranged to monitor the lifting process of a main arch; a cable force distribution scheme of a cable supporting system is calculated by adopting a double-layer game optimization model to realize cooperative control of stress uniformity and form precision, tensioning force is applied by using an intelligent tensioning system in stages, and a crane moving path is planned in combination with a path optimization algorithm based on a graph theory to realize graded unloading of a temporary supporting system. The technical problem that it is difficult to achieve structural stress uniform distribution and form accurate control of an arched large-span shell steel roof at the same time in the tensioning process of a cable supporting system is solved.

The invention provides a construction method of a prefabricated concrete member temporary support-to-permanent bearing system, which comprises the following steps of: prefabricating a concrete member in a factory according to the curvature of an arc-shaped arch plate, and reserving a rectangular bearing groove at the top; the prefabricated part is hoisted to the designed position, and lateral clamping constraint is formed through a lower fixing device; steel pipe secondary ridges are installed in the bearing grooves, a matched comb plate formwork is laid on the steel pipe secondary ridges, and the bottom face of the comb plate formwork is attached to the top face of the prefabricated part; pouring concrete around the upper and lower chord plates and the prefabricated parts layer by layer to enable the prefabricated cast-in-place structure to form a whole; the auxiliary support is gradually dismantled along with concrete strength increase, and load transfer to the prefabricated part is completed; and the steel pipe secondary edges and the comb plate formworks are dismantled, the bearing grooves are filled, and a continuous stress section is formed. The problems of eccentric load bearing and structural integrity are solved, the method is suitable for the scene that upper and lower chord plates of the arc-shaped arch slab and prefabricated parts are integrally poured, and the construction efficiency and the structural safety are improved.

The invention belongs to the technical field of automatic control, and particularly relates to a large-span ellipsoidal glass structure space noise reduction method based on sound field optimization, and the method comprises the steps: 1, transmitting a sample noise in an ellipsoidal glass structure through a sound wave generator, building a sound wave propagation model to describe the behavior of the sample noise in the ellipsoidal structure, an incident sound field is obtained; 2, analyzing the propagation characteristics of the sample noise in the ellipsoidal glass structure to obtain an acoustic structure coupling equation, and solving the acoustic structure coupling equation to obtain structural vibration displacement; 3, obtaining a sound radiation field of the ellipsoidal glass structure according to the structural vibration displacement; and step 4, combining the incident sound field and the sound radiation field, and performing spatial noise reduction by reflecting the sound pressure of the sound field. According to the method, the problems of poor adaptability and low control precision of a traditional noise reduction method in a non-uniform structure are effectively solved, and the noise reduction efficiency, the control sensitivity and the environment adaptability of a building space are remarkably improved.

The invention provides a large-diameter storage tank and isolation lining synchronous installation device and an installation method thereof.The large-diameter storage tank and isolation lining synchronous installation device comprises a tank body and lifting devices annularly arrayed on the periphery of the bottom of the tank body, the tank body is formed by splicing a plurality of ring cylinder sections in a lap joint mode, the cylinder sections are formed by splicing a plurality of arc-shaped pieces in a lap joint mode, and lifting pieces are detachably and fixedly arranged at the bottoms of the vertical lap joint positions of the cylinder sections; the lifting devices are used for being connected with the even number of lifting devices and used for alternately lifting the installed shell ring and the newly-added shell ring. The lifting device is arranged outside the tank body, so that the working space in the tank body is effectively released, the isolation lining can be synchronously mounted in the tank body assembling process, the process splitting caused by the fact that the lifting mechanism occupies the area in the tank body in the traditional process is avoided, the whole construction period is obviously shortened, and the construction efficiency is improved. The management and coordination cost caused by secondary entering is reduced, the lining can be accurately laid and attached under the open, safe and visible working conditions, and the lap joint sealing performance and the structural consistency are greatly improved.

A frame supporting type air rib membrane structure system comprises a frame supporting structure, an air rib structure and a membrane structure. The frame supporting structure comprises a supporting unit; the supporting units are arranged at intervals in the longitudinal direction. The supporting unit comprises a stand column and a top support. The air rib structure is mounted on the outer side of the frame supporting structure and is formed by splicing a plurality of air rib type membrane structure units; each air rib type membrane structure unit comprises an air rib and a connecting pipe; the air ribs are arranged in parallel at intervals, and one group of air ribs are horizontally arranged; the group of air ribs are communicated with one another through connecting pipes to form one or more independent inflation loops; pressure sensors are arranged on the surfaces of the air ribs; and the membrane structure covers the outside of the air rib structure and is detachably connected with the air rib structure. The technical problems that a traditional gas film structure is small in application range, insufficient in stability, prone to being large in film surface deformation and unstable in gas rib are solved, and the technical problems that a traditional gas rib type film structure is poor in adjustment flexibility, large in operation difficulty and high in cost are further solved.

The invention concerns a spherical structure It comprises a number of interlocking 5- and 6-sided panels that is joined together at the corners with locking discs.

The invention provides a roof adopting a large-span arch supporting cable stiffening grid structure and a construction method, and relates to the field of building steel structures. Each large-span arch supporting cable stiffening grid structure comprises a pair of parabola-shaped main arches, a central connection structure, a cantilever and a stabilizing cable. The pair of main arches are oppositely inclined and symmetrically arranged; the central connection structure is continuously arranged between the pair of main arches and forms a shell surface; the two groups of cantilevers are symmetrically connected to two opposite outer sides of the pair of main arches respectively; the stabilizing cable extends in the longitudinal direction of the cantilever and is connected to the bottom of the cantilever. The central connection structure and the cantilevers are both of space grid structures; the multiple pairs of main arches are sequentially connected in a crossed mode in the longitudinal direction of the roof. The construction of the roof is completed through the construction method of main arch and central connection structure installation, primary unloading, cantilever installation and secondary unloading. According to the roof and the construction method thereof, the steel consumption can be reduced, the lightness of the cantilever structure is improved, and the manufacturing cost is reduced.

The present invention relates to interior furniture capable of easy assembly and structural change, and having excellent space utilization and excellent appearance. The interior furniture according to the present invention comprises: a cabinet comprising a pair of side panels which are formed to extend in the vertical direction and arranged to be spaced apart from each other while facing each other, a rear plate coupled to the rear surfaces of the pair of side panels, and a support plate installed horizontally between the pair of side panels; and a wall panel which comprises a vertical side surface in the vertical direction, an upper horizontal side surface extending horizontally from the upper end portion of the vertical side surface, and an arch-shaped side surface connecting the end portion of the upper horizontal side surface and the lower end portion of the vertical side surface, and which has a half-arched shape obtained by bisecting an arch shape in the vertical direction. In addition, the side panels and the wall panel can be coupled in a first coupling manner in which the wall panel and the side panels are coupled to each other in parallel at the front end portion of the side panels, and in a second coupling manner in which the wall panel and the side panels are orthogonally coupled to each other at the front end portion of the side panels.

The invention belongs to the technical field of grid structures, and discloses an inner ring reticulated shell structure and welding auxiliary equipment thereof, the inner ring reticulated shell structure comprises a transverse arc-shaped rod body and a longitudinal arc-shaped rod body, the axis of the transverse arc-shaped rod body is vertical, and the arc extension track of the transverse arc-shaped rod body is distributed in the horizontal direction; the axis of the longitudinal arc-shaped rod body is horizontal, the arc extending track of the longitudinal arc-shaped rod body is distributed in the vertical direction, and the extending track of the longitudinal arc-shaped rod body is perpendicular to the extending track of the transverse arc-shaped rod body. The number of the transverse arc-shaped rod bodies and the number of the longitudinal arc-shaped rod bodies are both multiple, the two ends of each transverse arc-shaped rod body are connected with the two adjacent longitudinal arc-shaped rod bodies respectively, and the multiple transverse arc-shaped rod bodies and the multiple longitudinal arc-shaped rod bodies jointly form an alms-bowl-shaped structure used for reinforcing the historic building. On the premise that the integrity of the original structure of the ancient building is not damaged, the overall stability and deformation resistance of the ancient building are remarkably improved, and the targeted reinforcing and protecting effect is achieved.

A sanitary pit liner system for collection of human waste in developing countries includes a plurality of curved, interlocking pit liner segments that snap together to form a cylindrical pit liner, a plurality of curved, interlocking dome segments that snap together to form a dome, a gasket, a squat plate and squat pan user interface or a one-piece toilet user interface. A method of installing a sanitary pit liner system is also disclosed.

The invention discloses a large-span protective cover system and a synchronous unfolding and folding method thereof. The large-span protective cover system comprises a supporting platform, one or more protective cover sets and a synchronous unfolding and folding device. Each protective cover group comprises two protective cover units which can be rotationally opened oppositely, and each protective cover unit has an unfolded state and a folded state; in the folded state, each protective cover rotates to be in butt joint with the protective covers in the same protective cover set so as to completely cover a preset area on the supporting platform. In the unfolding state, each protective cover unit rotates to be opposite to the protective covers in the same protective cover group, so that a preset area on the supporting platform is completely exposed; the synchronous unfolding and folding device is used for driving all the protective cover units in one or more protective cover sets to achieve synchronous unfolding or folding. According to the invention, all the protective cover units in one or more protective cover groups can be synchronously unfolded or folded.

The utility model relates to the technical field of large-span steel-wood composite structures, and discloses a connecting structure of a large-span steel-wood composite structure, which comprises a shell, the bottom of the front side of the outer wall of the shell is provided with an entrance, the outer wall of the shell is fixedly connected with a plurality of fixing strips, the outer walls of the plurality of fixing strips are fixedly connected with positioning cable clamps, and the positioning cable clamps are fixedly connected with the outer wall of the shell. The front sides of the multiple positioning cable clamps are fixedly connected with clamps, the middles of the multiple clamps are fixedly connected with a steel cable, a damping mechanism is arranged on the periphery of the interior of the shell, the damping mechanism comprises multiple supporting columns, and the tops of the multiple supporting columns are fixedly connected to the top of the inner side of the shell. According to the utility model, the section of the building structure of the shell is apple-shaped, the hyperbolic steel structure provides support for the whole body, the plurality of fixing strips are connected with the shell in a mutual-supporting reticulated shell wood structure, the positioning cable clamps are distributed on the outer walls of the fixing strips, and the clamp clamps the steel cable made of the high vanadium cable, so that the stability of the shell is improved.

The application discloses a kind of fusion wear and weave wood's large-span wood structure and erecting method, including load-bearing component, arch component, roof beam component, roof component, load-bearing component is equipped with two, two load-bearing component interval arrangement, arch component includes multiple arches, multiple arches are interval arrangement along the length direction of load-bearing component, the middle part of arch is upwardly convex into arch, two ends of arch are fixedly connected with load-bearing component, arch adopts the way of weave wood and is formed, roof beam component is fixedly arranged in the top of arch component, roof beam component adopts the way of wear and is formed, roof component is installed in the top of roof beam component and load-bearing component, the present application is by using the way of weave wood interlocking arch as core stress main body, to small type structure strip splicing formation large-span arch structure, without relying on large diameter long material, reduce material cost, the arch of arch component Stress system can realize large-span columnless indoor space, solve the problem of traditional lifting beam structure dense column, space partition is limited.

The invention provides a spoke type cable truss structure with a cable and a membrane cooperatively stressed. The spoke type cable truss structure comprises an upper inner pressing ring beam, a lower inner pressing ring beam, an outer pressing ring structure, a cable and membrane unit and a plurality of cable truss units distributed in the annular direction. Wherein each cable membrane unit comprises a plurality of folding surface membranes, a plurality of membrane ridge cables and a plurality of membrane valley cables, the membrane ridge cables and the membrane valley cables are alternately distributed, every two adjacent membrane ridge cables and the membrane valley cable located between every two adjacent membrane ridge cables are distributed in a V shape and form a membrane covering framework, and the folding surface membranes are laid on the membrane covering framework to form a tension cable membrane structure; each cable truss unit comprises a radial cable, a connecting rod and a plurality of suspension cables, the two ends of each radial cable are connected with the outer pressing ring structure and the lower inner pressing ring beam, the two ends of each connecting rod are connected with the upper inner pressing ring beam and the lower inner pressing ring beam, a triangle is defined by the membrane valley cables, the connecting rods and the radial cables, and the two ends of each suspension cable are connected with the membrane ridge cables and the radial cables. According to the invention, not only can complex folding surface geometric modeling be accurately adapted and the aesthetic property of the building be improved, but also the stress distribution is optimized through the synergistic effect of the cable and the film.

To provide a tensegrity structure and a construction method thereof not only capable of enhancing structural stability but also keeping the structural stability upon partially buckling of compressed material or breaking of tensile material, to allow realization of a semi-spherical dome type tensegrity structure as a result.SOLUTION: In a tensegrity structure 101 configured to symmetrically and asymmetrically tensile-integrate a plurality of discontinuous column-like compressed members 10 arranged mutually in a non-contact manner by a closed network formed of linear tension members 20, a new network is formed which triangulates all polygonal openings in addition to radial tension members 3 connecting respective vertexes and centers of the polygonal openings in any of triangle, pentagon, quadrangle, and hexagon, or connects respective vertexes the polygonal openings diagonally for further fragmentation.SELECTED DRAWING: Figure 1

The invention discloses a modular assembling method for a dome structure. The modular assembling method comprises the following steps that firstly, an assembling site is prepared; secondly, an assembling table is manufactured, the assembling table is composed of transverse beams, longitudinal beams, supporting columns, inclined struts and brackets, and the manufacturing method comprises the following steps that (1) the two longitudinal beams are laid on a leveled assembling site according to the distance between the two adjacent main beams of the dome structure; according to the method, the dome structure is constructed in a modular mode by adopting the process that the assembling table is assembled on the horizontal ground, the chord height, the radius and other sizes of the dome arc-shaped structure can be effectively controlled, the welding shrinkage deformation allowance is reserved in advance according to the characteristic that the welding work amount is large, the quality of the dome structure can be effectively controlled, and the welding quality of the dome structure is effectively improved. Through the modular assembly mode of the dome structure, the dome structure can be integrally installed, the conventional high-altitude one-by-one and single-piece installation mode is changed, the installation precision is improved, the cost input is reduced, the construction period is shortened, and the economic benefits are improved.

The present application relates to the technical field of nuclear engineering civil modular construction, in particular to a nuclear engineering dome and a construction method thereof. The nuclear engineering dome comprises: a single-side spherical steel truss body, which comprises a spherical steel plate structure and a truss structure, the truss structure is arranged on the outer arc top wall of the spherical steel plate structure, and the truss structure is suitable for pouring first-stage concrete; the truss structure divides the outer arc top wall of the spherical steel plate structure into multiple partitioned spaces; a stiffening rib structure is arranged in the partitioned space, and the stiffening rib structure is arranged along the ring direction and the radial direction of the spherical steel plate structure respectively; an anchoring bolt is fixedly connected with the spherical steel plate structure at one end in the axial direction; the single-side spherical steel truss body, the anchoring bolt and the stiffening rib structure are suitable for jointly forming an integral single-side spherical steel plate truss prefabricated part. The nuclear engineering dome provided by the present application can improve the bearing capacity and construction safety and shorten the construction period.

The invention discloses a dense rib sandwich overlapped arch-shaped cover plate which comprises a transversely bent bottom plate, a plurality of linear pouring longitudinal ribs arranged on the outer circle of the bottom plate in a circumferential array, and a plurality of arc-shaped filling blocks arranged on the outer circle of the bottom plate between every two adjacent linear pouring longitudinal ribs. Arc-shaped pouring transverse ribs are arranged between every two adjacent filling blocks, arc-shaped upper flanges are arranged on the upper surfaces of the linear pouring longitudinal ribs, and the upper surfaces of the multiple arc-shaped upper flanges are located on the same arc surface and are coaxial with the bottom plate. Compared with an arched roof of an existing pipe gallery, the prefabricated assembly type structure is adopted, a large amount of on-site pouring operation is converted into industrialized production, the on-site formwork erecting, pouring and maintaining time is greatly shortened, the construction difficulty is remarkably reduced, the construction period is shortened, and the construction efficiency is improved; and a powerful longitudinal and transverse rib lattice stress system is formed.

The invention relates to the technical field of coal yard buildings, and discloses a building photovoltaic integrated type integrated device which comprises a net rack, a strengthening unit and a first suspension wire, the strengthening unit and the first suspension wire are arranged, the strengthening unit is a photovoltaic panel, an opening of the net rack is supported through the photovoltaic panel, the anti-load performance of the net rack is improved, and the construction efficiency is improved. And the horizontal outward thrust borne by the net rack is converted into the cable internal force of the first suspension wire. The rigidity of the ground beam and the complexity of connection between the ground beam and the support do not need to be increased in the prior art, so that the cost required for improving the load resistance of the net rack is reduced. Meanwhile, the strengthening unit is arranged in the opening of the net rack, the technical effect of improving the space utilization rate of the net rack can be achieved, the strengthening unit can absorb sunlight to generate electricity, two purposes are achieved, and then the technical effect of reducing the manufacturing cost of the building photovoltaic integrated type integrated device is achieved.

This invention discloses a multifunctional capsule hotel and its usage method, comprising a base, a main body structure, a balcony structure, and a kitchen structure. The main body structure is located above the base and includes a frame structure and an outer curved panel. The balcony structure is located in front of the main body structure and is connected to the main body structure via a telescopic bracket, which allows the balcony structure to separate or close from the main body structure. The kitchen structure is located inside the base and is a multi-layer pull-out structure. The main body structure of this invention is an ellipsoidal structure, formed by welding and fixing the frame and panel together, resulting in a smooth overall surface without any water accumulation dead corners. It is integrally formed, requiring no user assembly and is easy to use. The balcony structure and the main body structure are designed separately to meet different user needs.

The invention relates to a building shell (1) having multiple surface elements (2) that are supported by profile elements (3) of the building shell, said profile elements being interconnected via one or more connection nodes (4). For sealing between the connection nodes (4) and the surface elements (2), seal node elements (5) are provided, which each form a trough-like seal body. Said seal body has a planar seal base (6) by which said seal body lies on the particular connection node (4) and from the peripheral boundaries of which edge regions (7) project upward from the seal base (6), said edge regions each having an edge pedestal (8) and a seal contour (9) supported by said edge pedestal, which seal contour (9) sealingly adjoins one of the surface elements (2). Here, the upwardly projecting edge regions (7) each extend in a region that extends between the connections of two directly adjacent profile elements (3) to the connection node (4). No upwardly projecting edge regions with seal contours are provided in the regions of the seal node element (5) which are arranged in the region of the connections of the profile elements (3) to the connection node (4).

The utility model relates to the technical field of building structures, and particularly discloses a dome house building structure which comprises a bottom module and a top module. The top module is arranged at the top of the bottom module, is used for building the top of the dome house and can be connected with other modules; the connecting module is arranged between the bottom module and the top module and is used for building a dome house building; the splicing assemblies are arranged among the modules and are used for quickly splicing the modules; the connecting module is built on the bottom module through the splicing assembly, meanwhile, the top module is installed to form a bridge shape, finally, a worker can gradually build a dome shape according to the sequence from bottom to top, the splicing assembly can help the device to be rapidly built and formed, and due to the arrangement of a connecting steel plate, the construction efficiency is greatly improved. The bearing pressure of a traditional cement building mode on the building is reduced, and meanwhile the building efficiency is improved.

The present invention relates to lattice materials (5) used in many engineering fields, particularly materials engineering. These materials are formed from a lattice structure (1) comprising an inner element (2) in the form of an irregular polygon having at least six edges, with struts arranged along each edge to create at least one triangle (3.1).

The utility model provides a stadium ground bowl pool construction fixing structure which comprises a base, a supporting structure is arranged on the base, a reinforcing structure is arranged in the supporting structure, the supporting structure comprises arc-shaped rods, and a plurality of first cross rods and a plurality of second cross rods are arranged between every two adjacent arc-shaped rods. The first cross rod and the second cross rod are each internally provided with a cavity, the multiple cavities correspond to each other, and flat sliding plates are arranged on the upper sides of the first cross rod and the second cross rod and correspond to the arc-shaped rods. The arc-shaped rods are installed on the base, the first cross rod and the second cross rod are installed between the two arc-shaped rods, an arc-shaped face can be formed through the first cross rod and the second cross rod, therefore, the arc-shaped face can be automatically formed during pouring, smoothness can be guaranteed only through follow-up polishing, the radian does not need to be found through manual trowelling, operation is easy, and the production efficiency is improved. And the device has multiple use modes, concrete can be poured into the cavity, and the cost is reduced.

The invention discloses a universal joint connection spherical building capable of intelligently adjusting light and temperature, and relates to the technical field of constructional engineering. The supporting bottom ring is mounted at the top end of the base steel billet; the hemispherical room is mounted at the top end of the supporting bottom ring through a bearing; a plurality of solar panels; through cooperative work of the dimming film layer, the bonding sealing layer, the glass base material, the light sensor and the conductive electrode, the problem that manual operation of traditional building illumination adjustment is tedious is effectively solved, the light sensor can sense the external light intensity in real time and transmit a signal to the control system, and the control system controls the illumination adjustment of the building according to the signal of the light sensor. And the power-on condition of the conductive electrode is controlled, so that the light transmittance of the dimming film layer is adjusted, intelligent adjustment of light rays is achieved, a suitable illumination environment is provided for the indoor space, the flexibility of environment control and the convenience of use are improved, and the personalized use requirements of different scenes such as office, rest and reading are met.

The module is a plane-symmetrical solid (15), having a base (1), a spike (2), an inner surface (4), an outer surface (5), and a first (3') and a second (3") side wall. The inner surface (4) of the module is a wedge-shaped section (4) of the inner surface of the rectilinear tube (6), while its outer surface (5) is a wedge-shaped section (5) of the outer surface of the same tube (6). The boundaries of these two sections (4, 5) are defined by a first (11), a second (12) and a third (13) delimiting planes. The base (1) of the module, the bases (8, 10) of both mentioned wedge-shaped sections (4, 5) and an axis (14) of this tube (6) lie in the first delimiting plane (11). The plane of symmetry (15) of the module is perpendicular to the first delimiting plane (11) and to the axis (14) of the tube (6), while the second (12) and the third (13) delimiting planes are symmetrical with respect to the plane of symmetry (15), are perpendicular to the first delimiting plane (11) and intersect (16) each other. The line of intersection (16) of these planes lies in the plane of symmetry (15) of the module, is perpendicular to the first delimiting plane (11) and passes through the spikes (7, 9) of both wedge-shaped sections (4, 5) of the surface of the tube (6). On the first (3') and the second (3") side wall of the module there is a set of recesses (18) and protrusions (19), arranged symmetrically with respect to the plane of symmetry (15) and antisymmetrically with respect to the plane of antisymmetry (17), in which lies the axis (14) of the tube (6) and which is inclined to the first delimiting plane (11) at an angle (β) of 45 degrees.

The proposed technical solution relates to military defense structures, and more specifically, to military fortification structures used for engineering the positions of troops, checkpoints, guard outposts, border areas, and other critical facilities to ensure their effective protection and defense. A defensive fire structure comprises a body (1) assembled from blocks (2) with a cross-sectional shape corresponding to sector of a ring. The outer arc surface (3) of blocks (2) is bounded by a broken line, and congruent surfaces of blocks have cruciform projections (4) and cruciform recesses (5). At least three of said blocks (2) have through openings (6) of a stepped shape, which serve as embrasures. The defensive fire structure has a roof (7) made of elements shaped as sectors (8, 9) of a circle. Chords of sectors (8) of a circle located above the through openings (6) have length extended compared to the chord length of the other sectors (9) of the roof (7) circle. Sectors (9) of the roof (7) circle with the shorter chords rest on flat sections (12) of deflectors (10) mounted on both sides of the blocks (2) with through openings (6).

The invention discloses a building dome structure and a construction method thereof. The building dome structure comprises a base, and a fixing disc is erected on the base; a circle of multiple fan-shaped sealing plates are arranged in the circumferential direction of the fixed disc, and the small end of each fan-shaped sealing plate is installed on the outer edge of the fixed disc in a turnover mode; the supporting ring is erected on the base, the size of the supporting ring is adjustable, the supporting ring is coaxially arranged below the fixing disc, a sliding groove formed in the radial direction of the fan-shaped sealing plate is formed in the inner side of the fan-shaped sealing plate, and the supporting ring is connected with a sliding block arranged in the sliding groove in a sliding mode; the waterproof cloth is used for shielding a splicing seam between every two adjacent fan-shaped sealing plates, one end of the waterproof cloth is connected to one side of one fan-shaped sealing plate, the other side of the adjacent fan-shaped sealing plates is provided with a winding device, and the other end of the waterproof cloth is connected to the winding device; and the rain cover is mounted on the fixed disc and covers the small head ends of the plurality of fan-shaped sealing plates. The problems that when an existing dome structure is installed, the angle between a framework and a dome cannot be changed, and installation is not convenient enough are solved.