CN211948872U - T-shaped joint connecting structure formed by two steel beams - Google Patents
T-shaped joint connecting structure formed by two steel beams Download PDFInfo
- Publication number
- CN211948872U CN211948872U CN201922237708.XU CN201922237708U CN211948872U CN 211948872 U CN211948872 U CN 211948872U CN 201922237708 U CN201922237708 U CN 201922237708U CN 211948872 U CN211948872 U CN 211948872U
- Authority
- CN
- China
- Prior art keywords
- plate
- shaped steel
- holes
- steel beam
- twelfth
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Joining Of Building Structures In Genera (AREA)
Abstract
The utility model discloses a T-shaped joint connecting structure formed by two steel beams, which comprises two H-shaped steel beams, two connecting pieces and a bolt, wherein each H-shaped steel beam comprises an upper flange plate, a lower flange plate and a web plate; the connecting piece comprises an upper connecting plate, a lower connecting plate, a large waist plate and a small waist plate, and shovel-shaped dustpan-shaped structures are formed among the upper connecting plate, the lower connecting plate, the large waist plate and the small waist plate; the two H-shaped steel beams are arranged in a T shape. The utility model discloses only need use three kinds of standardized subassemblies, just can accomplish the T type nodal connection structure assembly that is formed by two girder steels, sound construction, practicality are strong, accord with the demand of modern assembly type building simple to operate swift and environmental protection.
Description
Technical Field
The utility model belongs to the technical field of housing construction, concretely relates to T type nodal connection structure who is formed by two girder steels.
Background
The steel structure building is a novel building system, breaks through the industrial boundary lines among the house area industry, the building industry and the metallurgical industry, and is integrated into a new industrial system, namely the steel structure building system which is generally seen by people in the industry.
Compared with the traditional concrete building, the steel plate or the section steel replaces reinforced concrete, so that the steel structure building has higher strength and better shock resistance. And because the components can be manufactured in factories and installed on site, the construction period is greatly reduced. Because the steel can be repeatedly used, the construction waste can be greatly reduced, and the steel is more environment-friendly, so the steel is widely adopted by all countries in the world and is applied to industrial buildings and civil buildings.
At present, the application of steel structure buildings on high-rise and super high-rise buildings is mature day by day, and the steel structure buildings gradually become mainstream building processes, and are the development direction of buildings in the future.
A large amount of building site welding has been adopted during traditional steel construction building construction, and construction speed is slow, and is serious to environmental pollution, and workman's operational environment is poor, still has the not good problem of controlling of welding quality standard. At present, the domestic assembly type steel frame structure system is still imperfect, and more assembly type steel frame structure systems which are convenient and fast to install and environment-friendly are needed to fully highlight the superiority of the steel structure building.
Patent document CN201610497605 discloses an assembled friction shaped steel node, including steel-pipe column, H shaped steel roof beam and connect upper and lower two sets of coupling assembling between them, coupling assembling includes backup pad and connecting plate, and backup pad and connecting plate are perpendicular and integrated into one piece, and the backup pad is laminated with the steel column surface, is provided with the through-hole on the connecting plate, through the fastener with H shaped steel roof beam on the upper and lower edge of a wing set up with the corresponding through-hole fixed connection of connecting plate. According to the number of H-shaped steel beams which need to be connected actually, each group of connecting assemblies comprises at least two connecting pieces which are connected through fasteners such as bolts; the connecting plate outside is provided with the flange, and the purpose makes the upper and lower edge of a wing joint of H shaped steel roof beam inboard at the flange, makes the connection more firm like this. However, the patent is not convenient enough and has more limitation conditions.
Therefore, a new T-shaped joint connecting structure formed by two steel beams needs to be designed.
Disclosure of Invention
An object of the utility model is to provide a T type nodal connection structure who is formed by two girder steels to traditional steel construction building construction that proposes in the solution background art has adopted a large amount of building site welding, and construction speed is slow, and is serious to environmental pollution, workman's operational environment is poor and the problem of the poor accuse of welding quality standard.
In order to achieve the purpose, the utility model provides a T-shaped node connecting structure formed by two steel beams, which comprises two H-shaped steel beams, two connecting pieces and a bolt, wherein each H-shaped steel beam comprises an upper flange plate, a lower flange plate and a web plate, and through holes are arranged at both ends of each H-shaped steel beam in the length direction; the connecting piece comprises an upper connecting plate, a lower connecting plate, a large waist plate and a small waist plate which are fixedly connected, the upper connecting plate and the lower connecting plate are vertically connected with the large waist plate and the small waist plate, the large waist plate and the small waist plate are also vertically connected, shovel-shaped dustpan-shaped structures are formed among the upper connecting plate, the lower connecting plate, the large waist plate and the small waist plate, through holes for passing bolts are formed in the upper connecting plate, the lower connecting plate, the large waist plate and the small waist plate are collectively called waist plates, and the upper connecting plate is connected with the upper flange plate, the lower connecting plate is connected with the lower flange plate, and the waist plate is connected with the web plate through corresponding holes and bolts; the distance L3 between the upper surface of the upper connecting plate and the lower surface of the lower connecting plate is less than or equal to the distance L4 between the lower surface of the upper flange plate and the upper surface of the lower flange plate, and the difference between L3 and L4 is less than or equal to 10 mm; sixteen through holes are formed in the two ends of the H-shaped steel beam, wherein one end of the upper flange plate comprises six through holes, one end of the web plate comprises four through holes, and one end of the lower flange plate comprises six through holes; ten through holes are formed in the connecting piece, wherein two through holes are formed in the upper connecting plate, the lower connecting plate and the small waist plate, and four through holes are formed in the large waist plate;
the two H-shaped steel beams are an eleventh H-shaped steel beam and a twelfth H-shaped steel beam respectively, the two connecting pieces are a twelfth connecting piece and a thirteenth connecting piece respectively, the upper flange plates of the two H-shaped steel beams are in the same plane, and the lower flange plates of the two H-shaped steel beams are in the same plane; a plurality of through holes are formed in the upper flange plate, the lower flange plate and the web plate in the middle of the eleventh H-shaped steel beam in the length direction; the plane of the web plate of the eleventh H-shaped steel beam is vertical to the plane of the web plate of the twelfth H-shaped steel beam, the end part of the twelfth H-shaped steel beam is connected with the middle part of the eleventh H-shaped steel beam, and the two H-shaped steel beams are arranged in a T shape; the large waist plates of the twelfth connecting piece and the thirteenth connecting piece are respectively attached to two sides of the web plate of the twelfth H-shaped steel beam, two through holes in the large waist plates of the twelfth connecting piece and the thirteenth connecting piece are connected with two through holes in the web plate of the twelfth H-shaped steel beam through bolts, the other two through holes in the large waist plates of the twelfth connecting piece and the thirteenth connecting piece are not used, and the two through holes in the small waist plates of the twelfth connecting piece and the thirteenth connecting piece are connected with the through holes in the middle of the web plate of the eleventh H-shaped steel beam through bolts.
In a specific embodiment, the difference between the distance L3 between the upper surface of the upper web and the lower surface of the lower web and the distance L4 between the lower surface of the upper flange plate and the upper surface of the lower flange plate is less than or equal to 3 mm.
In a specific embodiment, two through holes on the upper connecting plate of the twelfth connecting piece are respectively connected with through holes on the upper flange plates of the eleventh and twelfth H-shaped steel beams through bolts; and two through holes in the upper connecting plate of the thirteenth connecting piece are respectively connected with through holes in the upper flange plates of the eleventh H-shaped steel beam and the twelfth H-shaped steel beam through bolts.
In a specific embodiment, two through holes on the lower connecting plate of the twelfth connecting piece are respectively connected with through holes on lower flange plates of the eleventh and twelfth H-shaped steel beams through bolts; and two through holes in the lower connecting plate of the thirteenth connecting piece are respectively connected with through holes in the lower flange plates of the eleventh H-shaped steel beam and the twelfth H-shaped steel beam through bolts.
In a specific embodiment, the width L1 of the small waist panel is consistent with the width L2 of the protruding webs of the upper and lower flange panels.
In a specific embodiment, eight through holes are formed in the upper flange plate and the lower flange plate in the middle of the eleventh H-shaped steel beam in the length direction, and four through holes are further formed in the web plate in the middle of the eleventh H-shaped steel beam in the length direction.
Compared with the prior art, the utility model discloses following beneficial effect has:
the utility model discloses only need use three kinds of standardized subassemblies, just can accomplish the T type nodal connection structure assembly that is formed by two girder steels fast in a flexible way, sound construction, practicality are strong, accord with the demand of the swift and environmental protection of modern assembly type building simple to operate very much.
The utility model discloses the current H shaped steel of nimble application only need cut off and bore the H shaped steel and just can obtain the H shaped steel roof beam that meets the requirements, has simplified manufacturing procedure greatly, and manufacturing cost also can reduce, and whole production efficiency has all obtained showing the improvement.
The utility model discloses only need a standardized connecting piece, through nimble and H shaped steel roof beam make up, can solve the connected mode of the T type nodal connection structure that is formed by two girder steels, can satisfy the needs of room beam structure completely for firm in connection between the H shaped steel roof beam is reliable.
In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be described in further detail with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. In the drawings:
fig. 1 is a schematic structural diagram of an embodiment of the present invention;
fig. 2 is a schematic structural view of an H-shaped steel beam according to an embodiment of the present invention;
fig. 3 is a schematic structural view of another H-shaped steel beam according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a connecting member according to an embodiment of the present invention;
wherein, 1, H-shaped steel beams; 2. a connecting member; 3. a bolt; 11. an upper flange plate; 12. a lower flange plate; 13. a web; 14. a through hole; 21. an upper connecting plate; 22. a lower connecting plate; 23. a large waist plate; 24. a small waist plate; 25. a via hole; 1k, an eleventh H-shaped steel beam; 1m and a twelfth H-shaped steel beam.
Detailed Description
The embodiments of the invention will be described in detail hereinafter with reference to the accompanying drawings, but the invention can be implemented in many different ways, which are defined and covered by the claims.
The utility model provides a T-shaped node connecting structure formed by two steel beams, which comprises two H-shaped steel beams, two connecting pieces and a bolt, wherein the H-shaped steel beam 1 comprises an upper flange plate 11, a lower flange plate 12 and a web plate 13, and through holes 14 are arranged at both ends of the H-shaped steel beam 1 in the length direction; the connecting piece 2 comprises an upper connecting plate 21, a lower connecting plate 22, a large waist plate 23 and a small waist plate 24 which are fixedly connected, the upper connecting plate 21 and the lower connecting plate 22 are vertically connected with the large waist plate 23 and the small waist plate 24, the large waist plate 23 and the small waist plate 24 are also vertically connected, shovel-shaped dustpan-shaped structures are formed among the upper connecting plate 21, the lower connecting plate 22, the large waist plate 23 and the small waist plate 24, through holes 25 for penetrating through bolts 3 are formed in the upper connecting plate 21, the lower connecting plate 22, the large waist plate 23 and the small waist plate 24, the upper connecting plate 21 and the upper flange plate 11, the lower connecting plate 22 and the lower flange plate 12 and the waist plate and the web plate 13 are connected through corresponding holes and bolts 3; the distance L3 between the upper surface of the upper connecting plate and the lower surface of the lower connecting plate is less than or equal to the distance L4 between the lower surface of the upper flange plate and the upper surface of the lower flange plate, and the difference between L3 and L4 is less than or equal to 10 mm; sixteen through holes are formed in the two ends of the H-shaped steel beam 1, wherein one end of the upper flange plate comprises six through holes, one end of the web plate comprises four through holes, and one end of the lower flange plate comprises six through holes; ten through holes are formed in the connecting piece, wherein two through holes are formed in the upper connecting plate 21, the lower connecting plate 22 and the small waist plate 24, and four through holes are formed in the large waist plate;
the two H-shaped steel beams 1 are an eleventh H-shaped steel beam 1k and a twelfth H-shaped steel beam 1m respectively, the two connecting pieces 2 are a twelfth connecting piece and a thirteenth connecting piece respectively, the upper flange plates 11 of the two H-shaped steel beams 1 are in the same plane, and the lower flange plates 12 of the two H-shaped steel beams 1 are in the same plane; a plurality of through holes 14 are formed in the upper flange plate, the lower flange plate and the web plate in the middle of the eleventh H-shaped steel beam 1k in the length direction; the plane of the web plate of the eleventh H-shaped steel beam 1k is vertical to the plane of the web plate of the twelfth H-shaped steel beam 1m, the end part of the twelfth H-shaped steel beam 1m is connected with the middle part of the eleventh H-shaped steel beam 1k, and the two H-shaped steel beams are arranged in a T shape; the large waist plates of the twelfth connecting piece and the thirteenth connecting piece are respectively attached to two sides of a web plate of the twelfth H-shaped steel beam 1m, two through holes 25 in the large waist plates of the twelfth connecting piece and the thirteenth connecting piece are connected with two through holes 14 in the web plate of the twelfth H-shaped steel beam 1m through bolts 3, the other two through holes 25 in the large waist plates of the twelfth connecting piece and the thirteenth connecting piece are not used, and the two through holes 25 in the small waist plates of the twelfth connecting piece and the thirteenth connecting piece are connected with the through holes 14 in the middle of the web plate of the eleventh H-shaped steel beam 1k through bolts 3.
In a specific embodiment, the difference between the distance L3 between the upper surface of the upper web and the lower surface of the lower web and the distance L4 between the lower surface of the upper flange plate and the upper surface of the lower flange plate is less than or equal to 3 mm.
In a specific embodiment, two through holes on the upper connecting plate of the twelfth connecting piece are respectively connected with through holes on the upper flange plates of the eleventh H-shaped steel beam 1k and the twelfth H-shaped steel beam 1m through bolts; two through holes in the upper connecting plate of the thirteenth connecting member are respectively connected with through holes in the upper flange plates of the eleventh H-shaped steel beam 1k and the twelfth H-shaped steel beam 1m through bolts.
In a specific embodiment, two through holes on the lower connecting plate of the twelfth connecting piece are respectively connected with through holes on the lower flange plates of the eleventh H-shaped steel beam 1k and the twelfth H-shaped steel beam 1m through bolts; and two through holes in the lower connecting plate of the thirteenth connecting piece are respectively connected with through holes in the lower flange plates of the eleventh H-shaped steel beam 1k and the twelfth H-shaped steel beam 1m through bolts.
In a specific embodiment, the width L1 of the small waist panel is consistent with the width L2 of the protruding webs of the upper and lower flange panels.
In a specific embodiment, eight through holes are formed in the upper flange plate and the lower flange plate of the middle part of the eleventh H-shaped steel beam 1k in the length direction, and four through holes 14 are further formed in the web plate of the middle part of the eleventh H-shaped steel beam 1k in the length direction.
The utility model discloses only need use three kinds of standardized subassemblies, just can accomplish the T type nodal connection structure assembly that is formed by two girder steels fast in a flexible way, sound construction, practicality are strong, accord with the demand of the swift and environmental protection of modern assembly type building simple to operate very much.
The utility model discloses the current H shaped steel of nimble application only need cut off and bore the H shaped steel and just can obtain the H shaped steel roof beam that meets the requirements, has simplified manufacturing procedure greatly, and manufacturing cost also can reduce, and whole production efficiency has all obtained showing the improvement.
The utility model discloses only need a standardized connecting piece, through nimble and H shaped steel roof beam make up, can solve the connected mode of the T type nodal connection structure that is formed by two girder steels, can satisfy the needs of room beam structure completely for firm in connection between the H shaped steel roof beam is reliable.
The foregoing is a more detailed description of the invention, taken in conjunction with the specific preferred embodiments, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions and replacement, all should regard as belonging to the utility model discloses a protection scope.
Claims (6)
1. The T-shaped joint connecting structure formed by the two steel beams is characterized by comprising two H-shaped steel beams, two connecting pieces and bolts, wherein the H-shaped steel beam (1) comprises an upper flange plate (11), a lower flange plate (12) and a web plate (13), and through holes (14) are formed in the two ends of the H-shaped steel beam (1) in the length direction; the connecting piece (2) comprises an upper connecting plate (21), a lower connecting plate (22), a large waist plate (23) and a small waist plate (24) which are fixedly connected, the upper connecting plate (21) and the lower connecting plate (22) are both vertically connected with the large waist plate (23) and the small waist plate (24), the large waist plate (23) and the small waist plate (24) are also vertically connected, a shovel-shaped dustpan-shaped structure is formed among the upper connecting plate (21), the lower connecting plate (22), the large waist plate (23) and the small waist plate (24), through holes (25) for penetrating through bolts (3) are formed in the upper connecting plate (21), the lower connecting plate (22), the large waist plate (23) and the small waist plate (24) are collectively called waist plates, the upper connecting plate (21) and the upper flange plate (11) and the lower flange plate (22) and the lower flange plate (12) are both fixedly connected, the waist plate and the web plate (13) are connected through corresponding holes and bolts (3); the distance L3 between the upper surface of the upper connecting plate and the lower surface of the lower connecting plate is less than or equal to the distance L4 between the lower surface of the upper flange plate and the upper surface of the lower flange plate, and the difference between L3 and L4 is less than or equal to 10 mm; sixteen through holes are formed in the two ends of the H-shaped steel beam (1), wherein one end of the upper flange plate comprises six through holes, one end of the web plate comprises four through holes, and one end of the lower flange plate comprises six through holes; ten through holes are formed in the connecting piece, wherein two through holes are formed in the upper connecting plate (21), the lower connecting plate (22) and the small waist plate (24), and four through holes are formed in the large waist plate;
the two H-shaped steel beams (1) are an eleventh H-shaped steel beam (1k) and a twelfth H-shaped steel beam (1m) respectively, the two connecting pieces (2) are a twelfth connecting piece and a thirteenth connecting piece respectively, the upper flange plates (11) of the two H-shaped steel beams (1) are in the same plane, and the lower flange plates (12) of the two H-shaped steel beams (1) are in the same plane; a plurality of through holes (14) are formed in the upper flange plate, the lower flange plate and the web plate in the middle of the eleventh H-shaped steel beam (1k) in the length direction; the plane of the web plate of the eleventh H-shaped steel beam (1k) is vertical to the plane of the web plate of the twelfth H-shaped steel beam (1m), the end part of the twelfth H-shaped steel beam (1m) is connected with the middle part of the eleventh H-shaped steel beam (1k), and the two H-shaped steel beams are arranged in a T shape; the large waist plates of the twelfth connecting piece and the thirteenth connecting piece are respectively attached to two sides of a web plate of the twelfth H-shaped steel beam (1m), two through holes (25) in the large waist plates of the twelfth connecting piece and the thirteenth connecting piece are connected with two through holes (14) in the web plate of the twelfth H-shaped steel beam (1m) through bolts (3), the other two through holes (25) in the large waist plates of the twelfth connecting piece and the thirteenth connecting piece are not used, and the two through holes (25) in the small waist plates of the twelfth connecting piece and the thirteenth connecting piece are connected with the through holes (14) in the middle of the web plate of the eleventh H-shaped steel beam (1k) through bolts (3).
2. A T-shaped node connection structure formed by two steel beams according to claim 1, wherein the difference between the distance L3 between the upper surface of the upper connection plate and the lower surface of the lower connection plate and the distance L4 between the lower surface of the upper flange plate and the upper surface of the lower flange plate is less than or equal to 3 mm.
3. The T-shaped joint connection structure formed by two steel beams according to claim 1, wherein two through holes on the upper connection plate of the twelfth connecting member are respectively connected with through holes on the upper flange plates of an eleventh H-shaped steel beam (1k) and a twelfth H-shaped steel beam (1m) through bolts; and two through holes in the upper connecting plate of the thirteenth connecting piece are respectively connected with through holes in the upper flange plates of the eleventh H-shaped steel beam (1k) and the twelfth H-shaped steel beam (1m) through bolts.
4. The T-shaped joint connection structure formed by two steel beams according to claim 1, wherein two through holes on the lower connection plate of the twelfth connecting member are respectively connected with through holes on the lower flange plates of an eleventh H-shaped steel beam (1k) and a twelfth H-shaped steel beam (1m) through bolts; and two through holes in the lower connecting plate of the thirteenth connecting piece are respectively connected with through holes in the lower flange plates of the eleventh H-shaped steel beam (1k) and the twelfth H-shaped steel beam (1m) through bolts.
5. A T-node connection between two steel beams according to claim 1, wherein the width L1 of the small waist panel is identical to the width L2 of the protruding webs of the upper and lower flange panels.
6. The T-shaped joint connection structure formed by two steel beams according to claim 1, wherein eight through holes are formed in the upper flange plate and the lower flange plate in the middle of the eleventh H-shaped steel beam (1k) in the length direction, and four through holes (14) are formed in the web plate in the middle of the eleventh H-shaped steel beam (1k) in the length direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922237708.XU CN211948872U (en) | 2019-12-13 | 2019-12-13 | T-shaped joint connecting structure formed by two steel beams |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922237708.XU CN211948872U (en) | 2019-12-13 | 2019-12-13 | T-shaped joint connecting structure formed by two steel beams |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211948872U true CN211948872U (en) | 2020-11-17 |
Family
ID=73175126
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922237708.XU Expired - Fee Related CN211948872U (en) | 2019-12-13 | 2019-12-13 | T-shaped joint connecting structure formed by two steel beams |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211948872U (en) |
-
2019
- 2019-12-13 CN CN201922237708.XU patent/CN211948872U/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110952664B (en) | Method for assembling assembled steel frame structure to form house | |
| CN110284605A (en) | Assembly type concrete filled steel tube combined column joint area connecting structure | |
| CN113882506B (en) | Assembly type truss beam steel beam barrel structure system connected through full bolts | |
| CN211948874U (en) | T-shaped node beam column connecting structure formed by two steel beams | |
| CN211816926U (en) | Girder steel cross node beam column connection structure | |
| CN211948872U (en) | T-shaped joint connecting structure formed by two steel beams | |
| CN110952665B (en) | Assembled steel frame structure system | |
| CN109898644B (en) | Modularized steel structure node | |
| CN211816925U (en) | T-shaped joint connecting structure formed by three steel beams | |
| CN211816924U (en) | Linear type node connection structure of steel beam | |
| CN211948871U (en) | Steel beam right-angle type connecting structure | |
| CN211257310U (en) | Steel beam cross-shaped node connecting structure | |
| CN211948875U (en) | Girder steel linear type node beam column connection structure | |
| CN211948873U (en) | T-shaped node beam column connecting structure formed by three steel beams | |
| CN211816927U (en) | Steel beam right-angle beam column connecting structure | |
| CN111809747A (en) | Beam column splicing node | |
| CN214994627U (en) | Space steel structure node | |
| CN214302358U (en) | Be applied to nodal connection device of modularization steel construction shear force wall hidden column and roof beam | |
| CN113250318B (en) | Modularization steel frame connection structure | |
| CN210032084U (en) | Modularization steel structure node | |
| CN214657821U (en) | H-shaped steel support and crossbeam assembled connection structure | |
| CN112267562A (en) | Assembled steel truss beam column connection part | |
| CN210195232U (en) | Assembled steel construction floor bearing structure and steel construction building | |
| CN112267563A (en) | Steel beam column connection node for fine construction | |
| CN218116738U (en) | Beam column connecting node assembly and engineering frame structure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20201117 Termination date: 20211213 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |