CN218176121U - Stress release device for large-span concave type stereo pipe truss structure - Google Patents
Stress release device for large-span concave type stereo pipe truss structure Download PDFInfo
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- CN218176121U CN218176121U CN202222500093.7U CN202222500093U CN218176121U CN 218176121 U CN218176121 U CN 218176121U CN 202222500093 U CN202222500093 U CN 202222500093U CN 218176121 U CN218176121 U CN 218176121U
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Abstract
The utility model relates to a concave type stereoscopic pipe truss structure stress relief device of large-span belongs to steel construction building construction technical field. The device comprises two brackets fixed on two sides of the top of the steel pipe concrete column, two overhanging structural members fixed on two sides of a cross supporting plate, two hydraulic jacks supported between the brackets and the overhanging structural members, and two polytetrafluoroethylene plates padded between the top surface of the separated steel pipe concrete column and the lower surface of a support. The utility model discloses the device has solved the recessed type stereo tube truss roof structure of large-span because support bottom plate and steel core concrete column roof contact friction force are big and the unable automatic release's of stress that produces after the installation is accomplished problem. The utility model discloses device design science, rational in infrastructure, easy operation, construction convenience, the security is high, and construction cost is low, has ensured through the device that the straightness that hangs down of steel core concrete column accords with standard regulation, has guaranteed the safety and the quality of structure.
Description
Technical Field
The utility model belongs to the technical field of steel construction building construction, specifically a concave type three-dimensional pipe truss structure stress relief device of large-span. The device is a stress release device which is adopted when stress generated after installation cannot be automatically released due to the fact that a support base plate is in contact with a steel pipe concrete column top plate and friction force is large in a large-span concave type stereoscopic pipe truss structure.
Background
With the development of the times, the forms of steel structure buildings are gradually diversified, and steel structure buildings with various shapes are applied, wherein the steel structure buildings comprise large-span concave stereo pipe truss roofs. The two ends of the lower chord tube of the pipe truss of the steel structure building are hinged to the column top of the steel pipe concrete column through a support (an anti-seismic spherical steel support), and the upper part of the pipe truss is a metal roof system. After the concave type three-dimensional pipe truss is installed in place, firstly, a support at one end is welded and fixed with the top of a steel pipe concrete column, and a support at the other end is welded and fixed after the roof structure installation, the purlin installation and the roof panel installation are completed. Along with the gradual change of the load of the upper part of the concave type three-dimensional pipe truss in the installation process, the concave type three-dimensional pipe truss is deformed in a downwarping mode, horizontal stress is generated at the supports at two ends, the friction force between the bottom plate of each support and the steel plate at the top of the column is larger than the horizontal stress, the rigidity of the concrete-filled steel tube column is not enough to resist the horizontal stress, horizontal displacement is generated at the column head of the concrete-filled steel tube column, the verticality of the concrete-filled steel tube column exceeds the standard, and the structural safety is affected.
Disclosure of Invention
The utility model aims at solving the problem that the unable automatic release of stress that produces after the installation was accomplished is big because support bottom plate and steel core concrete column post roof contact friction force are big for the recessed type stereo pipe truss roof structure of large-span, and provide a recessed type stereo pipe truss structure stress release device of large-span.
The utility model discloses a realize through following technical scheme:
the utility model provides a concave type three-dimensional pipe truss structure stress relief device of large-span, includes two brackets, two overhanging structure spare, two hydraulic jack and two polytetrafluoroethylene boards.
Two brackets are fixed respectively in the both sides at steel core concrete column top, and the bracket includes three interval and parallel arrangement vertical plate ribs, and vertical plate rib is the triangle-shaped form in right angle, and three vertical plate ribs all use the topside to set up for the form of right angle limit, inboard side for right angle limit, outside limit for the hypotenuse to the inboard side right angle limit department of three vertical plate ribs all with the vertical wallboard welded fastening of steel core concrete column, the common welded fastening of topside right angle limit department of three vertical plate ribs has an upper portion horizontal plate as hydraulic jack bottom sprag face.
The two cantilever structural members are respectively fixed on two sides of a cross support plate which is connected with the lower chord tube and the support, each cantilever structural member comprises three vertical connecting plates which are arranged at intervals and in parallel, each vertical connecting plate is rectangular, and the three vertical connecting plates are all arranged in a mode that the top edge and the bottom edge are long edges, and the inner side edge and the outer side edge are short edges; the inner side edges of the three vertical connecting plates extend into the cross supporting plate and are welded and fixed with the ribbed plates of the cross supporting plate, and meanwhile, the plate surfaces of the three vertical connecting plates are respectively attached to the plate surfaces of the three supporting plates of the cross supporting plate and are welded and fixed; and the bottom edges of the three vertical connecting plates are welded and fixed with a lower horizontal plate serving as a top supporting surface of the hydraulic jack.
The two hydraulic jacks are respectively arranged on two sides of the hinged position of the concrete filled steel tubular column and the support, the bottom of a cylinder body of each hydraulic jack is supported on an upper horizontal plate of the bracket on the same side, and the top of a piston rod of each hydraulic jack is supported on a lower horizontal plate of the cantilever structural member on the same side.
Two teflon plate pads are arranged between the top surface of the separated concrete-filled steel tubular column and the lower surface of the support.
The utility model discloses the theory of operation of device does: the two hydraulic jacks are utilized to lift the concave three-dimensional pipe truss, the two polytetrafluoroethylene plates are arranged between the column top and the support, then the two hydraulic jacks are synchronously unloaded, the column top and the support slide relatively between the two polytetrafluoroethylene plates, so that the horizontal stress generated by the concave three-dimensional pipe truss and the steel pipe concrete column under the action of construction load is released, the horizontal displacement of the column head of the steel pipe concrete column under the action of the original construction load is recovered, and the verticality of the steel pipe concrete column meets the design and standard requirements.
Furthermore, one side of the polytetrafluoroethylene plate is a smooth surface, the other side of the polytetrafluoroethylene plate is a surface with a concave pit, the smooth surface of the polytetrafluoroethylene plate on the upper layer faces the lower surface of the support, the smooth surface of the polytetrafluoroethylene plate on the lower layer faces the top surface of the concrete filled steel tube column, the surface with the concave pit of the polytetrafluoroethylene plate on the upper layer and the surface with the concave pit of the polytetrafluoroethylene plate on the lower layer are arranged oppositely, and vaseline petrolatum lubricating oil is smeared between the surfaces.
Furthermore, a temporary support limiting stop iron is welded and fixed on a top plate of the steel tube concrete column, and a gap of 50mm is reserved between the temporary support limiting stop iron and a bottom plate of the support.
Further, the size of the PTFE sheet of the lower layer is 550mm × 650mm × 5mm, and the size of the PTFE sheet of the upper layer is 480mm × 480mm × 5mm.
Furthermore, the surface with the pits of the polytetrafluoroethylene plate is a surface with a plurality of uniformly distributed pits.
Further, stress release is sequentially performed from the concave-shaped vertical pipe truss at one end of the building to the concave-shaped vertical pipe truss at the other end of the building.
The specific stress release method of the large-span concave stereo pipe truss structure stress release device comprises the following steps of:
1) Preparing each component for forming the stress release device;
2) Two sides of the top of the steel pipe concrete column are respectively fixed with a bracket which can be used as a bottom supporting surface of the hydraulic jack;
3) The lower chord tube and the support of the concave three-dimensional tube truss are fixedly connected through a cross support plate, so that two sides of the cross support plate are respectively fixed with an overhanging structural member which can be used as a top support surface of the hydraulic jack;
4) Two sides of a hinged part of the steel tube concrete column and the lower concave three-dimensional tube truss support are respectively provided with a hydraulic jack, the bottom of a cylinder body of each hydraulic jack is supported on an upper horizontal plate of a bracket, and the top of a piston rod of each hydraulic jack is supported on a lower horizontal plate of the cantilever structural member;
5) Controlling two hydraulic jacks to synchronously support, synchronously slowly jacking the lower concave three-dimensional pipe truss for 10mm, jacking for two times, jacking for 5mm, observing no abnormity, and then jacking for 5mm; cleaning the top surface of the separated concrete-filled steel tubular column and the lower surface of the support, and arranging two 5 mm-thick polytetrafluoroethylene plates between the top surface and the lower surface to form an upper layer of polytetrafluoroethylene plate and a lower layer of polytetrafluoroethylene plate; the smooth surface of the upper polytetrafluoroethylene plate faces the lower surface of the support, the smooth surface of the lower polytetrafluoroethylene plate faces the top surface of the concrete-filled steel tubular column, the surface with the pits of the upper polytetrafluoroethylene plate and the surface with the pits of the lower polytetrafluoroethylene plate are oppositely arranged, and vaseline and petrolatum lubricating oil is smeared between the surfaces to reduce the friction force between the surfaces;
6) Controlling the two hydraulic jacks to synchronously descend for unloading, converting the load of the concave type stereo pipe truss structure from the support of the synchronous hydraulic jacks into the support of the polytetrafluoroethylene plates, and simultaneously, enabling the two polytetrafluoroethylene plates to relatively slide so as to release stress;
7) After the load of the upper structure of the lower concave type stereo pipe truss is loaded, the support and the steel pipe concrete column are welded and fixed, the polytetrafluoroethylene plate outside the groove is cut off along the groove of the bottom plate of the support, a welding backing plate with the thickness of 6mm and the width of 10mm is additionally arranged at the position of the welding groove, and the support and the top plate of the steel pipe concrete column are welded and fixed by adopting multilayer multi-pass welding.
Compared with the prior art, the utility model discloses the beneficial effect of method as follows:
the utility model discloses the device has solved the recessed type stereo tube truss roof structure of large-span because support bottom plate and steel core concrete column roof contact friction force are big and the unable automatic release's of stress that produces after the installation is accomplished problem. The utility model discloses device design science, it is rational in infrastructure, easy operation, construction convenience, the security is high, and construction cost is low, has ensured through the device that the straightness that hangs down of steel core concrete column accords with standard regulation, has guaranteed the safety and the quality of structure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate exemplary embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention in any way.
Fig. 1 is a schematic connection diagram of a large-span concave type stereo pipe truss and a concrete-filled steel pipe column.
Fig. 2 is a front view of the connection of a lower chord pipe in a large-span concave type stereo pipe truss and a concrete filled steel pipe column through a support.
Fig. 3 is a side view of the connection between the lower chord tube and the steel tube concrete column through the support in the large-span concave type stereo tube truss.
FIG. 4 is a front view of a stress relief means between the pedestal and the concrete filled steel tubular column.
Fig. 5 is a side view of a stress relief means between the pedestal and the steel core concrete column.
Fig. 6 is a front view of the structure of a bracket in the stress relieving apparatus.
Fig. 7 is a structural side view of a corbel in the strain relief device.
Fig. 8 is a front view of the cantilevered structure of the stress relief apparatus.
Fig. 9 is a structural side view of an overhanging structure in the stress relieving apparatus.
FIG. 10 is a schematic view of the welding of the pedestal to the concrete filled steel tubular column.
In the figure: 1-a steel pipe concrete column, 2-a support, 3-a hydraulic jack, 4-a polytetrafluoroethylene plate, 5-a bracket, 6-an overhanging structural member, 7-a cross support plate, 8-a lower chord tube, 9-a welding backing plate, 10-a plurality of layers of multi-welding seams and 11-a concave vertical tube truss;
5-1-vertical plate ribs, 5-2-upper horizontal plates, 6-1-vertical connecting plates and 6-2-lower horizontal plates.
Detailed Description
In order to make the present invention better understood by those skilled in the art, the present invention will be further clearly and completely described below with reference to the accompanying drawings and embodiments. In addition, the features of the embodiments and examples in the present application may be combined with each other without conflict.
In the description of the present invention, it should be understood that the terms "top", "bottom", "inner", "outer", "upper", "lower", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
As shown in fig. 1 to 3, when the large-span concave three-dimensional pipe truss 11 is installed, the end parts of the two ends of the lower chord pipe 8 are hinged to the top of the steel pipe concrete column 1 through the support 2, the lower chord pipe 8 is connected with the support 2 through the cross support plate 7, the cross support plate 7 is fixed on the support 2, the cross support plate 7 is composed of a ribbed plate in the middle and three support plates fixed on the ribbed plate at intervals, notches for supporting and fixing the lower chord pipe 8 are formed in all the three support plates, and the lower chord pipe 8 is supported and fixed in the notches on the three support plates. However, as the installation process is carried out, the load on the upper part of the concave type stereo pipe truss 11 gradually changes, the concave type stereo pipe truss is deformed in a downwarping mode, horizontal stress is generated at the supports at the two ends, the friction force between the bottom plate of the support 2 and the steel plate at the top of the column is larger than the horizontal stress, the rigidity of the steel pipe concrete column 1 is not enough to resist the horizontal stress, horizontal displacement is generated at the column head of the steel pipe concrete column 1, the verticality of the steel pipe concrete column 1 exceeds the standard, and the structural safety is affected.
In order to solve the above problems, the present embodiment provides a large-span concave three-dimensional pipe truss structure stress relief device, as shown in fig. 4 and 5, which includes two brackets 5, two hydraulic jacks 3, two overhanging structural members 6, and two teflon plates 4.
The two brackets 5 are respectively fixed on two sides of the top of the concrete filled steel tubular column 1, as shown in fig. 6 and 7, each bracket 5 comprises three vertical plate ribs 5-1 which are arranged at intervals and in parallel, each vertical plate rib 5-1 is in a right triangle shape, the three vertical plate ribs 5-1 are arranged in a mode that the top edge is a right-angle edge, the inner side edge is a right-angle edge and the outer side edge is a bevel edge, the right-angle edges of the inner side edges of the three vertical plate ribs 5-1 are welded and fixed with the vertical wall plate of the concrete filled steel tubular column 1, the right-angle edges of the top edges of the three vertical plate ribs 5-1 are jointly welded and fixed with an upper horizontal plate 5-2, and the upper horizontal plate 5-2 serves as a bottom supporting surface of the hydraulic jack 3.
The two cantilever structural members 6 are respectively fixed on two sides of a cross support plate 7 connecting the lower chord tube 8 and the support 2, as shown in fig. 8 and 9, each cantilever structural member 6 comprises three vertical connecting plates 6-1 which are arranged at intervals and in parallel, each vertical connecting plate 6-1 is rectangular, and the three vertical connecting plates 6-1 are all arranged in a manner that the top edge and the bottom edge are long edges, and the inner edge and the outer edge are short edges; the inner side edges of the three vertical connecting plates 6-1 extend into the cross supporting plate 7 and are welded and fixed with the ribbed plates of the cross supporting plate 7, and meanwhile, the plate surfaces of the three vertical connecting plates 6-1 are respectively attached to the plate surfaces of the three supporting plates of the cross supporting plate 7 and are welded and fixed; the bottom edges of the three vertical connecting plates 6-1 are welded and fixed with a lower horizontal plate 6-2 which is used as a top supporting surface of the hydraulic jack 3.
The two hydraulic jacks 3 are respectively arranged at two sides of the hinged part of the concrete filled steel tubular column 1 and the support 2, the bottom of the cylinder body of the hydraulic jack 3 is supported on an upper horizontal plate 5-2 of the bracket 5, and the top of the piston rod of the hydraulic jack 3 is supported on a lower horizontal plate 6-2 of the cantilever structural member 6.
Two teflon plates 4 are padded between the top surface of the separated steel core concrete column 1 and the lower surface of the support 2.
The working principle of the stress release device described in this embodiment is as follows: the method comprises the steps of lifting a concave vertical pipe truss 11 by utilizing two hydraulic jacks 3, padding two polytetrafluoroethylene plates 4 between a column top and a support 2, unloading the two hydraulic jacks 3 synchronously, and enabling the column top and the support 2 to slide relatively between the two polytetrafluoroethylene plates 4, so that the horizontal stress generated by the concave vertical pipe truss 11 and the steel pipe concrete column 1 under the action of construction load is released, the horizontal displacement of the column head of the steel pipe concrete column 1 under the action of original construction load is recovered, and the verticality of the steel pipe concrete column 1 meets the requirements of design and specification.
The method for releasing the stress of the large-span concave type stereo pipe truss structure by using the stress release device in the embodiment specifically comprises the following steps:
1) Preparing the parts constituting the stress relief means, namely: the device comprises two brackets 5, two hydraulic jacks 3, two cantilever structural members 6 and two polytetrafluoroethylene plates 4;
2) Two sides of the top of the steel tube concrete column 1 are respectively fixed with a bracket 5;
3) Two sides of the cross-shaped support plate 7 are respectively fixed with an overhanging structural part 6;
4) Two sides of a hinged part of the steel tube concrete column 1 and a support 2 of a lower concave three-dimensional pipe truss 11 are respectively provided with a hydraulic jack 3, the bottom of a cylinder body of the hydraulic jack 3 is supported on an upper horizontal plate 5-2 of a bracket 5 on the same side, and the top of a piston rod of the hydraulic jack 3 is supported on a lower horizontal plate 6-2 of an overhanging structural part 6 on the same side;
5) Welding and fixing a temporary support limiting stop iron on a top plate of the steel tube concrete column 1, and reserving a gap of 50mm between the temporary support limiting stop iron and the bottom plate edge of the support 2; controlling two hydraulic jacks 3 to synchronously support, synchronously slowly jacking the lower concave three-dimensional pipe truss for 10mm, jacking for two times, jacking for 5mm, observing no abnormity, and then jacking for 5mm; cleaning the top surface of the separated concrete-filled steel tubular column 1 and the lower surface of the support 2, and arranging two 5 mm-thick polytetrafluoroethylene plates 4 between the top surface and the lower surface to form an upper layer of polytetrafluoroethylene plates 4 and a lower layer of polytetrafluoroethylene plates 4, wherein the size of the lower layer of polytetrafluoroethylene plates 4 is 550mm multiplied by 650mm, and the size of the upper layer of polytetrafluoroethylene plates 4 is 480mm multiplied by 480mm; one surface of the polytetrafluoroethylene plate 4 is a smooth surface, the other surface of the polytetrafluoroethylene plate 4 is a surface with pits, the surface with pits is a surface evenly distributed with a plurality of pits, the smooth surface of the polytetrafluoroethylene plate 4 on the upper layer faces the lower surface of the support 2, the smooth surface of the polytetrafluoroethylene plate 4 on the lower layer faces the top surface of the concrete-filled steel tubular column 1, the surface with pits of the polytetrafluoroethylene plate 4 on the upper layer and the surface with pits of the polytetrafluoroethylene plate 4 on the lower layer are oppositely arranged, and vaseline petrolatum lubricating oil is smeared between the surfaces to reduce the friction force between the surfaces;
6) Controlling the two hydraulic jacks 3 to synchronously descend for unloading, converting the structural load of the concave type three-dimensional pipe truss 11 from the support of the synchronous hydraulic jacks 3 into the support of the polytetrafluoroethylene plates 4, and simultaneously, enabling the two polytetrafluoroethylene plates 4 to relatively slide so as to release the stress;
7) After the upper structure load of the lower concave type vertical pipe truss 11 is loaded, the support 2 and the steel pipe concrete column 1 are welded and fixed, the polytetrafluoroethylene plate 4 outside a groove is cut off along a groove of a bottom plate of the support 2, a welding backing plate 9 with the thickness of 6mm and the width of 10mm is additionally arranged at the position of the welding groove, a plurality of layers of multi-pass welding seams 10 are adopted for welding, and the support 2 and a top plate of the steel pipe concrete column 1 are welded and fixed, as shown in fig. 10.
Further, the stress release sequence of the method is as follows: stress release is sequentially performed from the concave-shaped three-dimensional pipe truss 11 at one end of the building to the concave-shaped three-dimensional pipe truss 11 at the other end of the building.
The above-mentioned embodiments only represent several embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention.
Claims (5)
1. The utility model provides a concave type three-dimensional pipe truss structure stress relief device of large-span which characterized in that: the device comprises two brackets, two cantilever structural members, two hydraulic jacks and two polytetrafluoroethylene plates;
the two brackets are respectively fixed on two sides of the top of the steel pipe concrete column, each bracket comprises three vertical plate ribs which are arranged at intervals and in parallel, each vertical plate rib is in a right-angled triangle shape, the three vertical plate ribs are all arranged in a mode that the top edge is a right-angled edge, the inner side edge is a right-angled edge, and the outer side edge is a bevel edge, the right-angled edges of the inner side edges of the three vertical plate ribs are welded and fixed with the vertical wall plate of the steel pipe concrete column, and the right-angled edges of the top edges of the three vertical plate ribs are jointly welded and fixed with an upper horizontal plate serving as a bottom supporting surface of the hydraulic jack;
the two cantilever structural members are respectively fixed on two sides of a cross support plate which is connected with the lower chord tube and the support, each cantilever structural member comprises three vertical connecting plates which are arranged at intervals and in parallel, each vertical connecting plate is rectangular, and the three vertical connecting plates are all arranged in a mode that the top edge and the bottom edge are long edges, and the inner side edge and the outer side edge are short edges; the inner side edges of the three vertical connecting plates extend into the cross supporting plate and are welded and fixed with the ribbed plates of the cross supporting plate, and meanwhile, the plate surfaces of the three vertical connecting plates are respectively attached to the plate surfaces of the three supporting plates of the cross supporting plate and are welded and fixed; a lower horizontal plate serving as a top supporting surface of the hydraulic jack is welded and fixed at the bottom edges of the three vertical connecting plates;
the two hydraulic jacks are respectively arranged at two sides of the hinged part of the concrete filled steel tubular column and the support, the bottom of a cylinder body of each hydraulic jack is supported on an upper horizontal plate of the bracket at the same side, and the top of a piston rod of each hydraulic jack is supported on a lower horizontal plate of the cantilever structural member at the same side;
two teflon plate pads are arranged between the top surface of the separated concrete-filled steel tubular column and the lower surface of the support.
2. The large-span recessed stereo tube truss structure strain relief device of claim 1, wherein: one side of the polytetrafluoroethylene plate is a smooth surface, the other side of the polytetrafluoroethylene plate is a surface with pits, the smooth surface of the polytetrafluoroethylene plate on the upper layer faces the lower surface of the support, the smooth surface of the polytetrafluoroethylene plate on the lower layer faces the top surface of the concrete-filled steel tube column, the surface with pits of the polytetrafluoroethylene plate on the upper layer and the surface with pits of the polytetrafluoroethylene plate on the lower layer are oppositely arranged, and vaseline petrolatum lubricating oil is smeared between the surfaces.
3. The large-span recessed stereo tube truss structure strain relief device of claim 1 or 2, wherein: a support temporary limiting stop iron is welded and fixed on a top plate of the steel tube concrete column, and a gap of 50mm is reserved between the support temporary limiting stop iron and a bottom plate edge of the support.
4. The large-span recessed stereo tube truss structure strain relief device of claim 1 or 2, wherein: the dimensions of the PTFE sheet of the lower layer are 550mm by 650mm by 5mm, and the dimensions of the PTFE sheet of the upper layer are 480mm by 5mm.
5. The large-span recessed stereo tube truss structure stress relief device of claim 2, wherein: the surface with the pits of the polytetrafluoroethylene plate is a surface with a plurality of pits uniformly distributed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222500093.7U CN218176121U (en) | 2022-09-21 | 2022-09-21 | Stress release device for large-span concave type stereo pipe truss structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222500093.7U CN218176121U (en) | 2022-09-21 | 2022-09-21 | Stress release device for large-span concave type stereo pipe truss structure |
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| CN218176121U true CN218176121U (en) | 2022-12-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202222500093.7U Active CN218176121U (en) | 2022-09-21 | 2022-09-21 | Stress release device for large-span concave type stereo pipe truss structure |
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| CN (1) | CN218176121U (en) |
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