CN211690999U - Profiled steel sheet concrete floor - Google Patents
Profiled steel sheet concrete floor Download PDFInfo
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- CN211690999U CN211690999U CN201921836640.0U CN201921836640U CN211690999U CN 211690999 U CN211690999 U CN 211690999U CN 201921836640 U CN201921836640 U CN 201921836640U CN 211690999 U CN211690999 U CN 211690999U
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Abstract
The utility model discloses a profiled steel sheet concrete floor, which comprises a profiled steel sheet (2) and a plurality of lower support bars (1) which are arranged in parallel, wherein a plurality of profiled bulges (3) which are uniformly arranged are arranged on the profiled steel sheet (2), the openings of the profiled bulges (3) face to the lower support bars (1), and the length extending direction of the profiled bulges (3) is vertical to the lower support bars (1); be provided with in the die mould arch (3) of profiled sheet (2) and seal die mould billet (4), seal die mould billet (4) along the length extending direction setting of die mould arch (3) and with the opening internal surface fixed laminating of die mould arch (3), lower part support bar (1) laminate in the lower surface of sealing die mould billet (4) and with seal die mould billet (4) fixed connection. The utility model has the advantages of it can overcome prior art's drawback, and structural design is reasonable novel.
Description
Technical Field
The utility model relates to a profiled steel sheet concrete floor belongs to the building field.
Background
At present, with the rise of steel structure buildings in China, multi-story high-rise steel structure buildings are more and more emphasized by various governments, large steel structure companies and real estate developers due to the series of advantages of high strength, light dead weight, good earthquake resistance, high construction speed, low foundation cost, small occupied area, high industrialization degree, attractive appearance, environmental protection and the like. In the multi-story high-rise steel structure building engineering, the selection of a floor slab system is an important link. In recent years, when a reinforced concrete floor of a multi-story and high-rise steel structure building is constructed, a profiled steel sheet concrete floor slab is generally adopted, and if the existing profiled steel sheet concrete floor slab needs to have enough supporting strength, concrete with thicker thickness needs to be poured, so that the self weight of the floor slab is increased, and the supporting burden of the whole steel structure building is further increased.
SUMMERY OF THE UTILITY MODEL
The technical scheme of the utility model to exist among the prior art: if "current profiled steel sheet concrete floor will have sufficient support intensity, need pour the thick concrete of thickness, just so increased the dead weight of floor, and then increased the not enough of support burden of whole steel construction building", provide a profiled steel sheet concrete floor.
In order to solve the technical problem, the technical scheme adopted by the utility model is that the profiled steel plate concrete floor comprises a profiled steel plate and a plurality of lower supporting bars arranged in parallel, wherein the profiled steel plate is provided with a plurality of profiled bulges arranged uniformly, the openings of the profiled bulges face the lower supporting bars, and the length extension direction of the profiled bulges is perpendicular to the lower supporting bars; a closed profiled steel bar is arranged in the profiled protrusion of the profiled steel sheet, the closed profiled steel bar is arranged along the length extending direction of the profiled protrusion and fixedly attached to the inner surface of the opening of the profiled protrusion, and the lower support bar is attached to the lower surface of the closed profiled steel bar and fixedly connected with the closed profiled steel bar; an upper concrete layer is poured on the upper surface of the profiled steel sheet, an internal steel bar support is arranged in the upper concrete layer, and the internal steel bar support penetrates through the profiled protrusions on the profiled steel sheet and is fixedly connected with the closed profiled steel bars; and a steel plate supporting piece is arranged between the lower supporting strip and the lower surface of the profiled steel plate, one end of the steel plate supporting piece is fixedly connected with the lower supporting strip, and the other end of the steel plate supporting piece is attached to the lower surface of the profiled steel plate and is fixedly connected with the profiled steel plate.
In the technical scheme of this application, set up in the die mould arch of profiled sheet and sealed the profiled bar, improved profiled sheet support strength and anti deformability through sealing the profiled bar, and then improved the support strength of whole profiled sheet concrete floor. The closed profiled steel bars are hollow profiled steel pipes, the weight is light, the weight of the profiled steel plate concrete floor slab cannot be greatly increased, and due to the support of the closed profiled steel bars, the profiled steel plates have good supporting force, and the pouring thickness of the upper concrete layer can be reduced. Inside steel bar support supports upper portion concrete layer's intensity, with inside steel bar support and sealed profiled bar fixed connection for upper portion concrete layer and profiled sheet, the joint strength who seals the profiled bar increase, prevent upper portion concrete layer and profiled sheet, seal the profiled bar layering, and can increase the wholeness of whole profiled sheet concrete floor, form a holistic atress structure.
Preferably, in the profiled steel sheet concrete floor slab, the lower supporting bars are i-shaped steel, and one wing plate of the lower supporting bars is attached to the lower surface of the closed profiled steel bar; the lower support bar is provided with a plurality of steel bar connecting steel bars, one ends of the steel bar connecting steel bars penetrate through two wing plates of the lower support bar and are fixed through nuts, the other ends of the steel bar connecting steel bars penetrate through profiling protrusions on the closed profiling steel bars and the profiling steel plates and are fixed through nuts, and the end portions of the steel bar connecting steel bars are arranged in the upper concrete layer.
In this application, use the billet coupling bar will seal in the profiled bar is fixed in the profiled bulge of profiled sheet and will seal profiled bar, profiled sheet and be fixed in the lower part support bar for lower part support bar and seal profiled bar, profiled sheet have better joint strength, improve the holistic stress strength of profiled sheet concrete floor.
Preferably, the profiled steel sheet concrete floor is provided with a plurality of square steel tubes on the profiled steel sheet, the square steel tubes are parallel to the closed profiled steel bars, and the square steel tubes are located between the two adjacent profiled protrusions.
In this application, the square steel tube is used to increase the compressive strength of profiled steel sheet for the part between the adjacent profiled protrusion on the profiled steel sheet can bear great pressure, prevents that the part compressive deformation between the adjacent profiled protrusion on the profiled steel sheet. And the square steel pipe can support the upper concrete layer, and the deformation of the upper concrete layer is reduced.
Preferably, in the profiled steel sheet concrete floor, the steel sheet supporting piece comprises a supporting screw rod, one end of the supporting screw rod penetrates through the two wing plates of the lower supporting bar and is fixed through a nut, and the other end of the supporting screw rod penetrates through the profiled steel sheet and the square steel tube and is fixed through a nut; and the supporting screw rod is provided with a bearing sheet, and the bearing sheet is attached to the lower surface of the profiled steel plate and is fixed with the supporting screw rod through a nut.
In this application, the supporting screw is fixed in the profiled sheet with the square steel pipe on to bearing piece on the supporting screw supports the lower surface of bearing profiled sheet, makes on the profiled sheet with square steel pipe complex position have sufficient holding power, improves the support intensity of profiled sheet, and then has improved the support of square steel pipe to upper portion concrete layer.
Preferably, the profiled steel sheet concrete floor is characterized in that a plurality of through holes which are uniformly distributed are respectively formed in the profiled protrusion and the closed profiled steel bar, and the through holes of the profiled protrusion are matched with the through holes of the closed profiled steel bar; the internal steel bar support comprises a plurality of transverse steel bars and a plurality of longitudinal steel bars, the transverse steel bars are vertically fixed with the longitudinal steel bars, and the transverse steel bars penetrate through the profiling bulges and the through holes in the closed profiling steel bars.
In this application, the through-hole that horizontal reinforcing bar passes the die mould arch through in the die mould arch, on sealing the die mould billet and seals the die mould billet for horizontal reinforcing bar can with die mould arch, seal die mould billet fixed connection. The transverse steel bars and the longitudinal steel bars form a steel bar network, so that the strength of the upper concrete layer is improved.
Preferably, in the profiled steel sheet concrete floor, the longitudinal steel bars are arranged in parallel to the closed profiled steel bars, and the longitudinal steel bars are attached to the side surfaces of the profiled protrusions and fixedly welded with the profiled protrusions.
In this application, vertical reinforcing bar is fixed to be laminated in the bellied side surface of die mould for the bellied support intensity of die mould increases, and then has improved the bulk strength of profiled steel sheet concrete floor.
Preferably, in the profiled steel sheet concrete floor, a lower supporting steel plate is arranged between the closed profiled steel bars and the lower supporting bars, and the lower supporting steel plate is arranged in parallel to the profiled steel plate and attached to the surfaces of wing plates of the lower supporting bars; and a lower concrete pouring layer is poured between the lower bearing steel plate and the profiled steel plate.
In this application, fill the space between profiled sheet lower surface and the lower part support bar upper surface through lower part concrete placement layer for the part between two adjacent profiled protrusions on the profiled sheet has higher support intensity. And the lower bearing steel plate is used as a bottom template for casting the lower concrete casting layer and supports the casting of the lower concrete casting layer. When pouring, set up lower part support bar, lower part bearing steel sheet earlier, pour lower part concrete placement layer on lower part bearing steel sheet, when lower part concrete placement layer is not dry and solid, place closed die mould billet and die mould steel sheet, make lower part concrete placement layer shaping through the extrusion of closed die mould billet and die mould steel sheet.
Preferably, in the profiled steel sheet concrete floor slab, the ends of the steel bar connecting steel bars are pre-buried in the upper concrete layer, and the ends of the steel bar connecting steel bars are provided with the bending hooks.
In this application, set up the crotch of bending with the tip of billet coupling bar and make the tip of billet coupling bar and the joint strength on upper portion concrete layer improve, and then improved the whole degree of profiled steel sheet concrete floor.
Preferably, in the profiled steel sheet concrete floor slab, the end part of the supporting screw rod is embedded in the upper concrete layer in advance, and the end part is provided with a bending hook.
In this application, the tip that will support the screw rod sets up the crotch of bending and makes the tip of support screw rod and upper portion concrete layer's joint strength improve, and then has improved the wholeness degree of profiled steel sheet concrete floor.
The utility model has the advantages of it can overcome prior art's drawback, and structural design is reasonable novel. In the technical scheme of this application, set up in the die mould arch of profiled sheet and sealed the profiled bar, improved profiled sheet support strength and anti deformability through sealing the profiled bar, and then improved the support strength of whole profiled sheet concrete floor. The closed profiled steel bars are hollow profiled steel pipes, the weight is light, the weight of the profiled steel plate concrete floor slab cannot be greatly increased, and due to the support of the closed profiled steel bars, the profiled steel plates have good supporting force, and the pouring thickness of the upper concrete layer can be reduced. Inside steel bar support supports upper portion concrete layer's intensity, with inside steel bar support and sealed profiled bar fixed connection for upper portion concrete layer and profiled sheet, the joint strength who seals the profiled bar increase, prevent upper portion concrete layer and profiled sheet, seal the profiled bar layering, and can increase the wholeness of whole profiled sheet concrete floor, form a holistic atress structure.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
The technical features of the present invention will be further explained with reference to the accompanying drawings and specific embodiments.
As shown in the figures, the utility model relates to a profiled steel sheet concrete floor, including profiled steel sheet 2 and a plurality of parallel arrangement's lower part support bar 1, the profiled steel sheet 2 is provided with a plurality of evenly arranged profiled protrusions 3, the opening of profiled protrusion 3 is towards lower part support bar 1, the length extending direction of profiled protrusion 3 is set up perpendicularly with lower part support bar 1; a closed profiled steel bar 4 is arranged in a profiled protrusion 3 of the profiled steel sheet 2, the closed profiled steel bar 4 is arranged along the length extension direction of the profiled protrusion 3 and is fixedly attached to the inner surface of the opening of the profiled protrusion 3, and the lower support bar 1 is attached to the lower surface of the closed profiled steel bar 4 and is fixedly connected with the closed profiled steel bar 4; an upper concrete layer 5 is poured on the upper surface of the profiled steel sheet 2, an internal steel bar support is arranged in the upper concrete layer 5, and the internal steel bar support penetrates through the profiled protrusions 3 on the profiled steel sheet 2 and is fixedly connected with the closed profiled steel bars 4; be provided with steel sheet support piece between lower part support bar 1 and profiled sheet 2's the lower surface, steel sheet support piece's one end and 1 fixed connection of lower part support bar, steel sheet support piece's the other end laminate in profiled sheet 2's lower surface and with profiled sheet 2 fixed connection.
In the technical scheme of this application, set up in profiled protrusion 3 of profiled steel sheet 2 and sealed profiled steel bar 4, improved profiled steel sheet 2's support intensity and anti deformability through sealing profiled steel bar 4, and then improved the support intensity of whole profiled steel sheet concrete floor. Seal profiled bar 4 and be hollow profiled steel pipe, weight is lighter, can not make profiled steel sheet concrete floor's weight have great increase to owing to seal profiled steel bar 4's support, make profiled steel sheet 2 have better holding power, can reduce the thickness of pouring of upper portion concrete layer 5. Inside steel bar support supports the intensity of upper portion concrete layer 5, with inside steel bar support and seal profiled bar 4 fixed connection for upper portion concrete layer 5 and profiled sheet 2, the joint strength who seals profiled bar 4 increase, prevent upper portion concrete layer 5 and profiled sheet 2, seal profiled bar 4 layering, and can increase the wholeness of whole profiled sheet concrete floor, form a holistic atress structure.
The lower supporting strip 1 is in an I-shaped steel shape, and one wing plate of the lower supporting strip 1 is attached to the lower surface of the closed profiled steel bar 4; be provided with a plurality of billet coupling bars 6 on the support bar of lower part 1, two pterygoid laminas of support bar 1 of lower part are passed and are fixed through the nut to the one end of billet coupling bar 6, and the other end of billet coupling bar 6 passes and seals profiled bar 4, profiled sheet 2 on the profiled protrusion 3 and fix through the nut, and the tip of billet coupling bar 6 sets up in upper portion concrete layer 5.
In this application, use billet steel coupling bar 6 will seal in profiled bar 4 is fixed in profiled protrusion 3 of profiled steel sheet 2 and will seal profiled bar 4, profiled steel sheet 2 and be fixed in lower part support bar 1 for lower part support bar 1 and seal profiled bar 4, profiled steel sheet 2 have better joint strength, improve the holistic stress strength of profiled steel sheet concrete floor.
The profiled steel sheet 2 is provided with a plurality of square steel tubes 7, the square steel tubes 7 are arranged in parallel to the closed profiled steel bars 4, and the square steel tubes 7 are located between the two adjacent profiled protrusions 3.
In this application, use square steel pipe 7 to increase the compressive strength of profiled steel sheet 2 for the part between the adjacent profiled protrusion 3 on profiled steel sheet 2 can bear great pressure, prevents that the part compressive deformation between the adjacent profiled protrusion 3 on profiled steel sheet 2. And the square steel pipe 7 can support the upper concrete layer 5, reducing the deformation of the upper concrete layer 5.
The steel plate supporting piece comprises a supporting screw rod 8, one end of the supporting screw rod 8 penetrates through the two wing plates of the lower supporting strip 1 and is fixed through a nut, and the other end of the supporting screw rod 8 penetrates through the profiled steel plate 2 and the square steel pipe 7 and is fixed through a nut; the supporting screw 8 is provided with a bearing sheet 9, and the bearing sheet 9 is attached to the lower surface of the profiled steel sheet 2 and fixed with the supporting screw 8 through a nut.
In this application, support screw 8 is fixed in square steel pipe 7 on profiled sheet 2 to bearing piece 9 on the support screw 8 supports the lower surface of bearing profiled sheet 2, makes profiled sheet 2 go up and has sufficient holding power with square steel pipe 7 complex position, improves profiled sheet 2's support strength, and then has improved the support of square steel pipe 7 to upper portion concrete layer 5.
A plurality of through holes which are uniformly distributed are respectively arranged on the profiling protrusion 3 and the closed profiling steel bar 4, and the through holes of the profiling protrusion 3 are matched with the through holes of the closed profiling steel bar 4; inside steel bar support includes a plurality of transverse reinforcement 10 and a plurality of longitudinal reinforcement 11, and transverse reinforcement 10 and longitudinal reinforcement 11 vertical fixation, transverse reinforcement 10 pass on the die mould arch 3, seal the through-hole on the die mould billet 4.
In this application, horizontal reinforcing bar 10 passes protruding 3 of die mould and seals die mould billet 4 through the protruding 3 upper, through-hole on sealing die mould billet 4 of die mould for horizontal reinforcing bar 10 can with protruding 3, the 4 fixed connection of sealing die mould billet of die mould. The transverse reinforcement 10 and the longitudinal reinforcement 11 form a reinforcement network, which improves the strength of the upper concrete layer 5.
The longitudinal steel bars 11 are arranged in parallel to the closed profiled steel bars 4, and the longitudinal steel bars 11 are attached to the side surfaces of the profiled protrusions 3 and fixedly welded with the profiled protrusions 3.
In this application, longitudinal reinforcement 11 is fixed to be laminated in the protruding 3's of die mould side surface for the protruding 3's of die mould support intensity increases, and then has improved the bulk strength of profiled steel sheet concrete floor.
A lower supporting steel plate 12 is arranged between the closed profiled steel bar 4 and the lower supporting bar 1, and the lower supporting steel plate 12 is arranged in parallel to the profiled steel plate 2 and is attached to the surface of the wing plate of the lower supporting bar 1; and a lower concrete pouring layer 13 is poured between the lower supporting steel plate 12 and the profiled steel plate 2.
In this application, the space between the lower surface of the profiled steel sheet 2 and the upper surface of the lower support bar 1 is filled by the lower concrete cast layer 13, so that the portion between two adjacent profiled protrusions 3 on the profiled steel sheet 2 has higher support strength. The lower support steel plate 12 serves as a bottom formwork for casting the lower concrete cast layer 13, and supports casting of the lower concrete cast layer 13. When pouring, the lower supporting strip 1 and the lower supporting steel plate 12 are arranged, the lower concrete pouring layer 13 is poured on the lower supporting steel plate 12, when the lower concrete pouring layer 13 is not dried, the closed profiled steel bars 4 and the profiled steel plates 2 are placed, and the lower concrete pouring layer 13 is formed through extrusion of the closed profiled steel bars 4 and the profiled steel plates 2.
The end part of the steel bar connecting steel bar 6 is embedded in the upper concrete layer 5, and the end part is provided with a bending hook.
In this application, set up the crotch of bending with the tip of billet coupling bar 6 and make the tip of billet coupling bar 6 and the joint strength improvement of upper portion concrete layer 5, and then improved the wholeness degree of profiled steel sheet concrete floor.
The end part of the supporting screw rod 8 is embedded in the upper concrete layer 5 in advance, and the end part is provided with a bending hook.
In this application, the tip that will support screw 8 sets up the crotch of bending and makes support screw 8's tip and upper portion concrete layer 5's joint strength improve, and then has improved the wholeness degree of profiled steel sheet concrete floor.
Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art should also understand that the changes, modifications, additions or substitutions made within the scope of the present invention should belong to the protection scope of the present invention.
Claims (9)
1. The utility model provides a profiled steel sheet concrete floor which characterized in that: the steel plate pressing device comprises a pressing steel plate (2) and a plurality of lower supporting strips (1) which are arranged in parallel, wherein a plurality of pressing bulges (3) which are uniformly arranged are arranged on the pressing steel plate (2), openings of the pressing bulges (3) face the lower supporting strips (1), and the length extending direction of the pressing bulges (3) is perpendicular to the lower supporting strips (1); a closed profiled steel bar (4) is arranged in a profiled protrusion (3) of the profiled steel plate (2), the closed profiled steel bar (4) is arranged along the length extending direction of the profiled protrusion (3) and is fixedly attached to the inner surface of an opening of the profiled protrusion (3), and the lower support bar (1) is attached to the lower surface of the closed profiled steel bar (4) and is fixedly connected with the closed profiled steel bar (4); an upper concrete layer (5) is poured on the upper surface of the profiled steel plate (2), an internal steel bar support is arranged in the upper concrete layer (5), and the internal steel bar support penetrates through the profiled protrusions (3) on the profiled steel plate (2) and is fixedly connected with the closed profiled steel bars (4); be provided with steel sheet support piece between the lower part support bar (1) and profiled sheet (2) lower surface, steel sheet support piece's one end and lower part support bar (1) fixed connection, steel sheet support piece's the other end laminate in the lower surface of profiled sheet (2) and with profiled sheet (2) fixed connection.
2. The profiled steel sheet concrete floor of claim 1, wherein: the lower supporting strip (1) is in an I-shaped steel shape, and one wing plate of the lower supporting strip (1) is attached to the lower surface of the closed profiled steel strip (4); be provided with a plurality of billet coupling bars (6) on lower part support bar (1), two pterygoid laminas that lower part support bar (1) were passed to the one end of billet coupling bar (6) are fixed through the nut, and the other end of billet coupling bar (6) passes die mould arch (3) on closed die mould billet (4), profiled sheet (2) and is fixed through the nut, and the tip of billet coupling bar (6) sets up in upper portion concrete layer (5).
3. The profiled steel sheet concrete floor of claim 1, wherein: the profiled steel sheet (2) is provided with a plurality of square steel pipes (7), the square steel pipes (7) are arranged in parallel to the closed profiled steel bars (4), and the square steel pipes (7) are located between the two adjacent profiled bulges (3).
4. The profiled steel sheet concrete floor of claim 3, wherein: the steel plate supporting piece comprises a supporting screw rod (8), one end of the supporting screw rod (8) penetrates through the two wing plates of the lower supporting strip (1) and is fixed through a nut, and the other end of the supporting screw rod (8) penetrates through the profiled steel plate (2) and the square steel pipe (7) and is fixed through a nut; the supporting screw rod (8) is provided with a bearing sheet (9), and the bearing sheet (9) is attached to the lower surface of the profiled steel plate (2) and fixed with the supporting screw rod (8) through a nut.
5. The profiled steel sheet concrete floor of claim 1, wherein: a plurality of through holes which are uniformly distributed are respectively arranged on the profiling protrusion (3) and the closed profiling steel bar (4), and the through holes of the profiling protrusion (3) are matched with the through holes of the closed profiling steel bar (4); the internal steel bar support comprises a plurality of transverse steel bars (10) and a plurality of longitudinal steel bars (11), the transverse steel bars (10) are vertically fixed with the longitudinal steel bars (11), and the transverse steel bars (10) penetrate through the through holes in the profiling bulges (3) and the closed profiling steel bars (4).
6. The profiled steel sheet concrete floor of claim 5, wherein: the longitudinal steel bars (11) are arranged in parallel to the closed profiled steel bars (4), and the longitudinal steel bars (11) are attached to the side surfaces of the profiled protrusions (3) and fixedly welded with the profiled protrusions (3).
7. The profiled steel sheet concrete floor of claim 1, wherein: a lower bearing steel plate (12) is arranged between the closed profiled steel bar (4) and the lower supporting bar (1), and the lower bearing steel plate (12) is arranged in parallel to the profiled steel plate (2) and is attached to the surface of the wing plate of the lower supporting bar (1); and a lower concrete pouring layer (13) is poured between the lower supporting steel plate (12) and the profiled steel plate (2).
8. The profiled steel sheet concrete floor of claim 2, wherein: the end part of the steel bar connecting steel bar (6) is embedded in the upper concrete layer (5) in advance, and the end part is provided with a bending hook.
9. The profiled steel sheet concrete floor of claim 4, wherein: the end part of the supporting screw rod (8) is embedded in the upper concrete layer (5) in advance, and a bent hook is arranged at the end part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921836640.0U CN211690999U (en) | 2019-10-29 | 2019-10-29 | Profiled steel sheet concrete floor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921836640.0U CN211690999U (en) | 2019-10-29 | 2019-10-29 | Profiled steel sheet concrete floor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211690999U true CN211690999U (en) | 2020-10-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921836640.0U Active CN211690999U (en) | 2019-10-29 | 2019-10-29 | Profiled steel sheet concrete floor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211690999U (en) |
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2019
- 2019-10-29 CN CN201921836640.0U patent/CN211690999U/en active Active
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Address after: 266000 3rd floor, No.5 Nanhai Branch Road, Shinan District, Qingdao City, Shandong Province Patentee after: Qingdao Construction Group Co.,Ltd. Patentee after: QINGJIAN GROUP Co.,Ltd. Address before: 266000 3rd floor, No.5 Nanhai Branch Road, Shinan District, Qingdao City, Shandong Province Patentee before: QINGJIAN GROUP Co.,Ltd. Patentee before: QINGJIAN GROUP Co.,Ltd. |
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