CN217026649U - Steel pipe concrete arch foot hinge structure - Google Patents
Steel pipe concrete arch foot hinge structure Download PDFInfo
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- CN217026649U CN217026649U CN202122135737.2U CN202122135737U CN217026649U CN 217026649 U CN217026649 U CN 217026649U CN 202122135737 U CN202122135737 U CN 202122135737U CN 217026649 U CN217026649 U CN 217026649U
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Abstract
The utility model discloses a steel pipe concrete arch foot hinge structure.A hinge shaft steel pipe is arranged at the lower end part of an arch ring, and the axis of the hinge shaft steel pipe is vertical to the plane of the arch ring; the hinge shaft steel pipe is fixedly connected with the upper chord of the arch ring and the lower chord of the arch ring through a hinge shaft connecting plate; the arch support is provided with a semi-cylindrical hinged support arc plate matched with the excircle of the hinged shaft steel pipe, and the hinged support arc plate is fixed on the arch support through a hinged support connecting plate. By adopting the technical scheme, the stress characteristic of arch segment hoisting is fully utilized, the arch ring is fixed on the arch support, the bearing area is increased, the contact stress is reduced, and the arch ring has the functions of tensile resistance and shear load resistance; the steel box arch bridge is simple in structure and convenient to hoist in place, the defects of pin joint type arch hinges in the prior art are completely overcome, and the steel box arch bridge, the steel box truss arch bridge and the concrete filled steel tube arch bridge have very high application prospects.
Description
Technical Field
The utility model belongs to the technical field of bridge structures in road traffic engineering. More particularly, the present invention relates to a concrete filled steel tube arch foot hinge structure.
Background
The development history of the arch bridge is long, the arch bridge still occupies an important position in modern highway and urban road and bridge engineering, and the arch ring of the arch bridge is mainly made of reinforced concrete, steel boxes, steel pipe concrete and the like. The steel box arch fully utilizes the tensile property of steel and the higher bearing capacity of the steel pipe concrete arch brought by the hoop effect of the steel pipe on concrete, and occupies a larger proportion in the middle-and-large-span arch bridge.
The common arch bridge construction method comprises the steps of sectional hoisting, cable-stayed buckling and fixing and arch ring folding. In the process, in order to obtain an ideal arch ring line shape and initial stress, temporary hinging is often arranged at the arch springing position, and consolidation operation is carried out after the arch ring line shape is closed and corrected. The operation can lead the bare arch to enter the next procedure in a zero bending moment state, and is an important means for saving the construction cost and ensuring the bridge line shape.
In prior art, the interim articulated realization of hunch end adopts the cross-core formula pin joint mode more, sets up the otic placode of fixing on the hunch end board promptly and fixes the fork otic placode at the hunch seat bottom plate, forms the pinhole that shares, inserts the round pin axle in the pinhole, and the articulated of cross-core formula pin joint realization possesses the advantage of drawing, pressing and shearing three-way bearing capacity, nevertheless also has certain not enoughly:
1. under the influence of materials and stress calculation, the diameter of the pin shaft is generally not too large, the bearing capacity of the pin shaft is limited, and the pin shaft cannot be used for an arch ring structure with larger span or larger self weight of an arch bridge;
2. stress concentration is serious when single group of lug plates are in pin joint, narrow lug plates and arch rings or arch seats with larger sizes are difficult to accord with the assumption of a flat section, strong end plates or bases and thicker lug plates are required to be arranged, and the bearing capacity of the pin joint is also restricted by the stability problem of the lug plates;
3. if a plurality of groups of lug plates are adopted for pin joint, the requirement on processing precision is extremely high, the welding deformation of the thicker lug plates is inevitably large, the lug plates are difficult to be correspondingly inserted in place one by one under the control condition of a large-tonnage crane, and pin shafts with higher precision requirements are more difficult to penetrate into pin holes formed by the plurality of groups of lug plates;
4. the pin joint type arch hinge structure has a complex structure, consumes more materials and is economically lack of competitiveness;
5. under the combined action of the self weight of the arch section and the tension of the buckle cable, the arch hinge only needs to bear pressure, and the tensile function of the pin joint type arch hinge structure cannot be exerted.
Disclosure of Invention
The utility model provides a steel pipe concrete arch foot hinge structure, and aims to overcome the defect that an arch ring and an arch support pin are connected with an arch hinge in the prior art.
In order to achieve the purpose, the utility model adopts the technical scheme that:
the steel pipe concrete arch foot hinge structure connects an arch ring with an arch support, wherein the arch ring comprises an arch ring upper chord and an arch ring lower chord; the lower end part of the arch ring is provided with a hinged shaft steel pipe, and the axis of the hinged shaft steel pipe is vertical to the plane of the arch ring; the hinge shaft steel pipe is fixedly connected with the upper chord of the arch ring and the lower chord of the arch ring through a hinge shaft connecting plate; the arch support is provided with a semi-cylindrical free bearing arc plate matched with the excircle of the hinge shaft steel pipe, and the free bearing arc plate is fixed on the arch support through a free bearing connecting plate.
The inner cavity of the hinge steel pipe is provided with hinge concrete, and the hinge steel pipe is filled with the hinge concrete.
And a hinge shaft connecting plate reinforcing plate which is superposed with the axis of the hinge shaft steel pipe is arranged between the hinge shaft connecting plates and is respectively and fixedly connected with the hinge shaft steel pipe and the hinge shaft connecting plate.
The hinge seat connecting plates are multiple, the planes of the hinge seat connecting plates are perpendicular to the axis of the steel pipe of the hinge shaft, and the hinge seat connecting plates are distributed in parallel and at uniform intervals; the bottom edge of the hinged support connecting plate is fixedly connected with a hinged support bottom plate on the surface of the arch support.
The foundation part of the arch support is concrete; the hinged support bottom plate is fixed on a concrete foundation of the arch support through a plurality of hinged support foundation bolts.
The hinge shaft steel pipe is made by cutting a steel pipe with the outer diameter of 500-1000 mm; the length of the material is 50-300 cm; the material is Q345 steel.
The concrete injected into the hinge shaft is C50-labeled concrete.
The hinged support arc plate is cut into a semicircular arc by adopting a steel pipe; the wall thickness is 16-30 mm; the length of the steel tube is equal to that of the hinged shaft steel tube.
The hinge shaft connecting plate is made of a Q345 steel plate; the thickness of the plate is 16-30 mm; for the steel box, the steel box truss or the four-chord steel pipe truss arch ring, the hinge shaft connecting plate is provided with four or more pieces; for the dumbbell-shaped steel tube arch ring, two hinge shaft connecting plates are arranged.
The material of the hinge shaft connecting plate reinforcing plate is a Q345 steel plate; the thickness of the hinge shaft connecting plate reinforcing plate is 12-25 mm.
The hinged support connecting plate is fixedly connected with the hinged support arc plate and the hinged support bottom plate by welding; the hinged support connecting plate is made of a Q345 steel plate; the thickness of the steel plate is 12-25 mm; the distance between the two plates is 20-40 cm.
The material of the hinged support bottom plate is Q345 steel plate, and the thickness of the plate is 25-50 mm.
The anchor bolt of the hinged support adopts a high-strength bolt assembly with M16-M24 hexagon heads to fasten the bottom plate of the hinged support on the arch support.
By adopting the technical scheme, the concrete-filled steel tube hinge shaft and the semi-steel tube hinge seat with larger diameters are adopted, the stress characteristic of arch section hoisting is fully utilized, and the arch ring is fixed on the arch seat by welding a plurality of groups of supporting connecting plates, so that the pressure-bearing area is increased, the contact stress is reduced, and the concrete-filled steel tube hinge shaft and the semi-steel tube hinge seat have the functions of tensile and shear load resistance; the steel box arch bridge is simple in structure and convenient to hoist in place, the defects of pin joint type arch hinges in the prior art are completely overcome, and the steel box arch bridge, the steel box truss arch bridge and the concrete-filled steel tube arch bridge have high application prospects.
Drawings
The contents of the drawings and the reference numbers in the drawings are briefly described as follows:
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a three-dimensional perspective view of the structure shown in fig. 1.
Labeled in the figure as:
1. the steel tube of the hinge shaft 2, concrete is filled in the hinge shaft 3, a hinge seat arc plate 4, a hinge shaft connecting plate 5, a hinge shaft connecting plate reinforcing plate 6, a hinge seat connecting plate 7, a hinge seat bottom plate 8, hinge seat foundation bolts 9, an arch support 10, an arch ring upper chord 11 and an arch ring lower chord.
Detailed Description
The following detailed description of the embodiments of the present invention will be given in order to provide those skilled in the art with a more complete, accurate and thorough understanding of the inventive concept and technical solutions of the present invention.
The structure of the utility model is a steel pipe concrete arch springing articulated structure as shown in fig. 1 and fig. 2, and connects an arch ring with an arch base 9, wherein the arch ring comprises an upper arch ring chord 10 and a lower arch ring chord 11.
Wherein:
FIG. 1 is a two-dimensional elevation view of a concrete filled steel tube leg hinge assembly; the figure mainly expresses the elevation section construction of the device and shows the structural schematic information, the material type and the like of the main components and the mutual connection relationship and the mutual position relationship of the hinge device;
fig. 2 is a three-dimensional view of a concrete filled steel tube arch foot hinge assembly, more vividly and intuitively showing the structural features of the present invention.
In order to achieve the purpose of overcoming the pin joint type hinge defect in the prior art, the utility model adopts the technical scheme that:
as shown in fig. 1 and 2, in the steel tube concrete arch springing hinge structure, a hinge steel tube 1 is arranged at the lower end part of an arch ring, and the axis of the hinge steel tube 1 is vertical to the plane of the arch ring; the hinged shaft steel pipe 1 is fixedly connected with an upper arch ring chord 10 and a lower arch ring chord 11 through a hinged shaft connecting plate 4; the arch support 9 is provided with a semi-cylindrical free bearing arc plate 3 matched with the excircle of the hinged shaft steel pipe 1, and the free bearing arc plate 3 is fixed on the arch support 9 through a free bearing connecting plate 6.
The hinge shaft connecting plate 4 is mainly used for welding the hinge shaft steel pipe 1 and a main arch ring (comprising an upper arch ring chord 10 and a lower arch ring chord 11) into a whole, so that smooth force transmission is ensured;
for steel boxes, steel box trusses or four-chord steel pipe truss arch rings, four or more than four hinge shaft connecting plates 4 can be arranged generally; for the dumbbell-shaped steel tube arch ring, two hinge shaft connecting plates 4 can be arranged.
The hinge shaft of the steel pipe concrete arch springing hinge device is made of steel pipes and concrete, and arch ribs are connected by welding a plurality of groups of connecting plates; the hinged support arc plate 3 is made of a semi-steel pipe and is fixed on the arch support 9 by means of a supporting connecting plate, the structure is simple, the hoisting is easy and convenient to place, and the defect that a pin joint type arch hinge is adopted in the prior art is completely overcome.
The diameter of the hinge shaft steel pipe 1 is set according to stress requirements, and the hinge shaft steel pipe is generally made by cutting a steel pipe with the outer diameter of 500-1000 mm; or the steel pipe with the same specification (including diameter, wall thickness and material) as the existing chord steel pipe of the steel pipe type main arch ring is obtained by cutting; the adopted material is consistent with the material of the main arch ring, and is Q345 steel; the length of the steel plate is related to the load during construction, and is generally 50-300 cm; the hinge shaft steel pipe 1 is welded and fixed on the first arch section through the hinge shaft connecting plate 4. The wall thickness of the hinge shaft steel pipe 1 is 12-25 mm, and the steel pipe is rolled by Q345.
The technical scheme is closely combined with the construction process of the arch ring, the characteristic that the arch hinge only bears pressure is caused by the combined force of the cable force of the buckle cable and the self weight of the arch section, and the arch end hinge is realized by adopting a method of laying the steel pipe concrete hinge shaft into a steel pipe hinge seat with a semicircular section; the hinge shaft and the arch section as well as the hinge seat and the arch seat are all welded and fixed by steel plates.
Application examples of the present invention: a five span truss-like steel pipe concrete tied arch bridge, its span arranges that: 40+138+188+138+40m, and 12 groups of main arch rings of three pairs of main arch rings are all hinged by the hinging device, all the arch hinging structures can accurately realize all functional indexes of arch end hinging in the construction process, no abnormal phenomenon occurs, and the operation is good.
The inner cavity of the hinge shaft steel pipe 1 is internally filled with concrete 2, and the inner cavity of the hinge shaft steel pipe 1 is filled with the concrete 2 in the hinge shaft. The hinge shaft is internally injected with concrete 2 and is doped with a micro-expanding agent according to test indexes.
The main function of the concrete 2 injected into the hinge shaft is to ensure that the hinge shaft steel pipe 1 maintains the basic shape under the stress state, so that the stress of the arch hinge is in accordance with the design given state; the inner concrete is generally marked by C50 and is consistent with the strength index and the micro-expansion index of the inner concrete of the steel pipe concrete arch rib.
The hinged support arc plate 3 is made of rolled steel pipes and is cut to form a semi-circular arc, the wall thickness of the hinged support arc plate is 16-30 mm, and the length of the hinged support arc plate is equal to that of the hinged shaft steel pipe 1. The hinged support arc plate 3 is used for placing the hinged shaft steel pipe 1, and the inner diameter of the hinged support arc plate is consistent with the outer diameter of the hinged shaft steel pipe 1; the inner wall of the hinged support arc plate 3 is subjected to finish machining and is matched with the excircle of the hinged shaft steel pipe 1, so that the hinged stress construction principle is met; the length of the steel tube is consistent with that of the hinged shaft steel tube 1; the hinged support arc plate 3 is fixed on the hinged support bottom plate 7 through the hinged support connecting plate 6 in a welding mode. The material is cut by adopting a Q345 steel pipe.
The hinge shaft connecting plate 4 is made of steel materials consistent with the main arch ring, and is generally a Q345 steel plate; the thickness of the hinge shaft connecting plate 4 can be 16-30 mm.
And a hinge shaft connecting plate reinforcing plate 5 which is superposed with the axis of the hinge shaft steel pipe 1 is arranged between the hinge shaft connecting plates 4 and is respectively fastened and connected with the hinge shaft steel pipe 1 and the hinge shaft connecting plate 4.
The main purpose of the hinge shaft connecting plate reinforcing plate 5 is to ensure that the hinge shaft connecting plate 4 does not generate buckling deformation under the normal stress working condition, and ensure that the whole hinge shaft structure conforms to the assumption of a flat section.
The material of the hinge shaft connecting plate reinforcing plate 5 is the same as that of the hinge shaft connecting plate 4, and a Q345 steel plate is generally adopted; the thickness of the hinge shaft connecting plate reinforcing plate 5 is 12-25 mm.
The hinge seat connecting plates 6 are multiple, the planes of the hinge seat connecting plates are perpendicular to the axis of the hinge shaft steel pipe 1, and the hinge seat connecting plates are parallel and uniformly distributed at intervals; the bottom edge of the hinged support connecting plate 6 is fixedly connected with a hinged support bottom plate 7 on the surface of an arch support 9.
The hinged support connecting plate 6 is fixedly connected with the hinged support arc plate 3 and the hinged support bottom plate 7 by welding; the material of the hinged-seat connecting plate 6 generally adopts a Q345 steel plate; the thickness of the steel plate is 12-25 mm; the distance between the two arc plates is controlled by the space required by welding operation and the tightening operation of the anchor bolts 8 of the hinged support, generally between 20 cm and 40cm, and the number of the arc plates is determined by the length of the arc plates 3 of the hinged support.
The free bearing connecting plate 6 is fixedly welded with the free bearing arc plate 3 and the free bearing bottom plate 7.
The hinged support bottom plate 7 is used for supporting a hinged support, the hinged support connecting plate 6 is welded on the hinged support bottom plate 7, and an arch support bottom steel plate is generally directly used for replacing the hinged support bottom plate; the 7-arch support bottom plate of the hinged support bottom plate is the same as a component, the material of the 7-arch support bottom plate is Q345 steel plate generally, and the thickness of the plate is 25-50 mm.
The foundation part of the arch support 9 is concrete; the hinged-seat bottom plate 7 is fixed on a concrete foundation of an arch support 9 through a plurality of hinged-seat foundation bolts 8.
The anchor bolt 8 kit contains bolt, nut and packing ring.
The hinged-seat foundation bolt 8 can adopt M16-M24 hexagon-head high-strength bolt components to fasten the hinged-seat bottom plate 7 on the arch support 9.
The design process of the utility model is as follows:
1. firstly, performing stress calculation and structural design of an arch bridge, and determining main structural parameters, a foundation form and a construction process of an arch ring;
2. designing the specification and the size of a hinge shaft according to the axial force required by the dead weight of the bare arch in the construction process;
3. designing the number and the structure of the hinge shaft connecting plates according to the axial force;
4. designing the specification and the size of a hinged support arc plate and the number and the structure of hinged support connecting plates according to the size of a hinged shaft;
5. and further determining the arrangement of the anchor bolts of the bottom plate of the arch hinged support.
The actual construction and installation of the utility model are carried out according to the following procedures:
1. processing and installing a hinged support assembly:
blanking, installing and welding and forming components such as a hinged support arc plate 3, a hinged support connecting plate 6, a hinged support bottom plate 7 and the like to form a hinged support assembly;
performing finish machining on the inner wall of the hinged support arc plate 3, and matching with the hinged shaft steel pipe 1;
binding reinforcing steel bars of an arch support 9, installing a pre-embedded hinged support foundation bolt 8, installing a processed hinged support assembly in place according to the position of the pre-embedded hinged support foundation bolt 8, and pouring arch support concrete by using a vertical mold;
when necessary, the gap between the hinged support bottom plate 7 and the concrete arch support is filled compactly through a grouting mode, air is discharged, a gasket and a nut matched with the foundation bolt are installed, the nut is screwed according to the designed torsion, and the installation of the hinged support assembly is finished.
2. Processing and installing a hinge shaft assembly:
blanking a hinge shaft steel pipe 1, a hinge shaft connecting plate 4 and a hinge shaft connecting plate reinforcing plate 5;
then welding and assembling the components to form a hinge shaft component;
accurately positioning, welding and assembling the hinge shaft assembly and the first arch section of the arch ring;
pouring micro-expansion concrete in the hinge shaft and curing.
3. Assembling the arch hinges:
the first arch section of the arch ring is hoisted, the hinge shaft steel pipe 1 is horizontally placed into a hinge seat arc plate 3 of a hinge seat at a corresponding position, the coordinates and the angle of the first arch section are corrected by a buckle cable or a bracket, and the hinge device immediately informs that the first arch section enters a working state.
4. After the arch ring is closed:
after the arch rings are closed, the arch rings are fixedly connected with the arch seats, the hinge device is withdrawn from working, and at the moment, mechanical equipment can be adopted to cut off the arch hinge device; if the arch springing consolidation adopts the mode of concrete coating, the device can be sealed in the arch base.
In the whole implementation process, the welding of the hinge seat assembly and the hinge shaft assembly is finished in a factory, and the welding operation is basically not carried out on the site of an installation site.
The utility model has the beneficial effects that:
the steel pipe concrete arch foot hinge device has a very high application prospect in steel box arch bridges, steel box truss arch bridges and steel pipe concrete arch bridges. The concrete filled steel tube hinge shaft and the semi-steel tube hinge seat with larger diameters are adopted, so that the bearing area is increased, the contact stress is reduced, the stress characteristic of arch section hoisting is fully utilized, the tensile load function of the hinge device is abandoned, and the defects of complex structure, more material consumption and limited bearing capacity of the traditional pin joint type arch hinge are overcome.
The application range of the utility model is as follows:
the method is suitable for various steel boxes, steel box trusses and steel pipe concrete arch bridges, and is particularly suitable for the steel pipe concrete truss arch bridge; when the single-box steel box arch bridge is applied, the corresponding longitudinal reinforcing plate 5 needs to be arranged in the arch box so as to meet the rigidity transition requirement of the connecting area of the hinge shaft connecting plate 4.
The above-described structure of the present invention is not generally applicable to arch bridges having no temporary hinge process during construction.
The present invention has been described in detail with reference to the accompanying drawings, and it is to be understood that the utility model is not limited to the specific embodiments described above, and that various insubstantial modifications of the inventive concepts and solutions, or their direct application to other applications without modification, are intended to be covered by the scope of the utility model.
Claims (13)
1. A steel pipe concrete arch foot hinge structure connects an arch ring with an arch support (9), wherein the arch ring comprises an upper arch ring chord (10) and a lower arch ring chord (11); the method is characterized in that: the lower end part of the arch ring is provided with a hinged shaft steel pipe (1), and the axis of the hinged shaft steel pipe (1) is vertical to the plane of the arch ring; the hinge shaft steel pipe (1) is fixedly connected with an arch ring upper chord (10) and an arch ring lower chord (11) through a hinge shaft connecting plate (4); the semi-cylindrical free bearing arc plate (3) matched with the excircle of the hinged shaft steel pipe (1) is arranged on the arch support (9), and the free bearing arc plate (3) is fixed on the arch support (9) through a free bearing connecting plate (6).
2. A concrete filled steel tube arch foot hinge structure according to claim 1, wherein: the inner cavity of the hinge shaft steel pipe (1) is internally filled with concrete (2) in the hinge shaft, and the inner cavity of the hinge shaft steel pipe (1) is filled with the concrete (2) in the hinge shaft.
3. A concrete filled steel tube arch pin hinge structure as set forth in claim 1, wherein: and hinge shaft connecting plate reinforcing plates (5) which are superposed with the axis of the hinge shaft steel pipe (1) are arranged among the hinge shaft connecting plates (4) and are respectively fastened and connected with the hinge shaft steel pipe (1) and the hinge shaft connecting plates (4).
4. A concrete filled steel tube arch pin hinge structure as set forth in claim 1, wherein: the hinge seat connecting plates (6) are multiple, the planes of the hinge seat connecting plates are perpendicular to the axis of the hinge shaft steel pipe (1), and the hinge seat connecting plates are distributed in parallel and at even intervals; the bottom edge of the hinged support connecting plate (6) is fixedly connected with a hinged support bottom plate (7) on the surface of the arch support (9).
5. A concrete filled steel tube arch pin hinge structure as recited in claim 4, wherein: the foundation part of the arch support (9) is concrete; the hinged support bottom plate (7) is fixed on a concrete foundation of the arch support (9) through a plurality of hinged support foundation bolts (8).
6. A concrete filled steel tube arch foot hinge structure according to claim 1, wherein: the hinge shaft steel pipe (1) is made by cutting a steel pipe with the outer diameter of 500-1000 mm; the length of the support is 50-300 cm; the material is Q345 steel.
7. A concrete filled steel tube arch pin hinge structure as recited in claim 2, wherein: the concrete (2) injected into the hinge shaft adopts concrete labeled by C50.
8. A concrete filled steel tube arch foot hinge structure according to claim 1, wherein: the hinged support arc plate (3) is cut into a semicircular arc by adopting a steel pipe; the wall thickness is 16-30 mm; the length of the steel tube is equal to that of the hinge shaft steel tube (1).
9. A concrete filled steel tube arch foot hinge structure according to claim 1, wherein: the hinge shaft connecting plate (4) is made of a Q345 steel plate; the thickness of the plate is 16 to 30 mm; for steel boxes, steel box trusses or four-chord steel pipe truss arch rings, four or more than four hinge shaft connecting plates (4) are arranged; for the dumbbell-shaped steel tube arch ring, two hinge shaft connecting plates (4) are arranged.
10. A concrete filled steel tube arch pin hinge structure as set forth in claim 3, wherein: the material of the hinge shaft connecting plate reinforcing plate (5) adopts a Q345 steel plate; the thickness of the hinge shaft connecting plate reinforcing plate (5) is 12-25 mm.
11. A concrete filled steel tube arch pin hinge structure as recited in claim 5, wherein: the hinged support connecting plate (6) is fixedly connected with the hinged support arc plate (3) and the hinged support bottom plate (7) by welding; the hinged support connecting plate (6) is made of a Q345 steel plate; the thickness of the steel plate is 12-25 mm; the distance between the two plates is 20-40 cm.
12. A concrete filled steel tube arch foot hinge structure according to claim 5, wherein: the hinged support bottom plate (7) is made of a Q345 steel plate, and the thickness of the plate is 25-50 mm.
13. A concrete filled steel tube arch foot hinge structure according to claim 5, wherein: the anchor bolt (8) of the hinged support adopts a high-strength bolt assembly with M16-M24 hexagonal heads to fasten the bottom plate (7) of the hinged support on the arch support (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122135737.2U CN217026649U (en) | 2021-09-06 | 2021-09-06 | Steel pipe concrete arch foot hinge structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122135737.2U CN217026649U (en) | 2021-09-06 | 2021-09-06 | Steel pipe concrete arch foot hinge structure |
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| Publication Number | Publication Date |
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| CN217026649U true CN217026649U (en) | 2022-07-22 |
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| CN202122135737.2U Active CN217026649U (en) | 2021-09-06 | 2021-09-06 | Steel pipe concrete arch foot hinge structure |
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- 2021-09-06 CN CN202122135737.2U patent/CN217026649U/en active Active
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