CN112900640A - Anti-seismic energy-consumption connecting joint of assembled external wall panel and H-shaped steel beam - Google Patents
Anti-seismic energy-consumption connecting joint of assembled external wall panel and H-shaped steel beam Download PDFInfo
- Publication number
- CN112900640A CN112900640A CN202110123405.4A CN202110123405A CN112900640A CN 112900640 A CN112900640 A CN 112900640A CN 202110123405 A CN202110123405 A CN 202110123405A CN 112900640 A CN112900640 A CN 112900640A
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- piston
- external wall
- plate
- piston rod
- damping
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/38—Connections for building structures in general
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/92—Protection against other undesired influences or dangers
- E04B1/98—Protection against other undesired influences or dangers against vibrations or shocks; against mechanical destruction, e.g. by air-raids
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
Abstract
The invention discloses an anti-seismic energy-consumption connecting joint of an assembled external wall panel and an H-shaped steel beam, which comprises the H-shaped steel beam, an ALC external wall panel and an L-shaped connecting plate, wherein the L-shaped connecting plate is fixed on the H-shaped steel beam and the ALC external wall panel; the vertical wing plate of the L-shaped connecting plate is provided with a vertical square groove hole, two parallel movable plates are arranged in the square groove hole, a plurality of limiting soft plates which are parallel to each other are arranged between the two movable plates, a plurality of limiting damping devices are evenly distributed between the movable plates and the hole wall of the square groove hole of the L-shaped connecting plate, the vertical wing plate of the L-shaped connecting plate is fixed on the ALC external wall plate through high-strength bolts, and the high-strength bolts are installed between the two movable plates of the square groove hole. The anti-seismic energy-consumption connecting joint of the assembled external wall panel and the H-shaped steel beam is compact in structure, increases the sliding and deformation of the ALC external wall panel through elastic connection, and is high in connection strength, good in anti-seismic property, good in stability, convenient and fast to construct, safe and reliable.
Description
Technical Field
The invention relates to the technical field of building nodes, in particular to an anti-seismic energy-consumption connecting node of an assembled external wall panel and an H-shaped steel beam.
Background
The assembly type building is an important direction for realizing building industrialization, the assembly type structure can save a large amount of labor force, meanwhile, the construction quality is guaranteed, and the construction capacity and the construction speed can be greatly improved. The ALC board is a novel building material with excellent performance, and is a porous concrete forming board which is formed by using fly ash (or silica sand), cement, lime and the like as main raw materials, internally matching a steel bar net and curing through high-pressure steam. It has high strength, light weight, heat insulating, sound isolating, earthquake resisting, fireproof, sawing, planing and nailing functions, and is one kind of green building product with excellent performance.
At present, the problem that ALC wallboard and steel construction main part connected node exist mainly has in the trade: 1) the structure of the connecting node is more complex and the number of parts is more; 2) the connection node has no earthquake-resistant and energy-consuming function, when an earthquake occurs, the ALC wallboard cannot well adapt to the deformation of the steel frame main body, the rigidity is higher than that of the steel frame, the energy-consuming coefficient is reduced, and the damage of large cracks and even falling of the ALC wallboard can be caused; 3) the connection node is complex to install on site, even needs to be drilled on site, and can influence the performances of the ALC wallboard, such as beauty, water resistance, sound insulation, heat insulation and the like, and the construction speed, so that a certain blocking effect is realized on the industrialization process of the fabricated building. Therefore, it is necessary to develop a suitable anti-seismic energy-dissipation connection node structure of the fabricated external wall panel and the H-shaped steel beam.
Disclosure of Invention
The invention aims to: the anti-seismic energy-consumption connecting joint of the assembled external wall panel and the H-shaped steel beam is provided to solve the defects.
In order to achieve the above purpose, the invention provides the following technical scheme:
an anti-seismic energy-consumption connection node of an assembled external wall panel and an H-shaped steel beam comprises the H-shaped steel beam, an ALC external wall panel and an L-shaped connection plate, wherein the L-shaped connection plate consists of a transverse wing plate and a vertical wing plate, and the transverse wing plate and the vertical wing plate of the L-shaped connection plate are respectively fixed on the H-shaped steel beam and the ALC external wall panel; the vertical wing plate of the L-shaped connecting plate is provided with a vertical square groove hole, two parallel movable plates are arranged in the square groove hole, a plurality of limiting soft plates which are parallel to each other are arranged between the two movable plates, a plurality of limiting damping devices are evenly distributed between the movable plates and the hole wall of the square groove hole of the L-shaped connecting plate, the vertical wing plate of the L-shaped connecting plate is fixed on an ALC external wall plate through high-strength bolts, the high-strength bolts are installed between the two movable plates of the square groove hole, an embedded part is arranged in the ALC external wall plate, and the front end of each high-strength bolt is fixed in the embedded part.
Preferably, spacing damping device includes damping spring, damping piston pipe assembly and with damping piston pipe assembly matched with damping piston rod assembly, damping piston pipe assembly one end articulates on the pore wall of the square slotted hole of L type connecting plate, damping piston rod assembly one end articulates on the fly leaf, the damping piston rod assembly other end sets up inside the damping piston pipe assembly other end, damping spring sets up the outside at damping piston pipe assembly and damping piston rod assembly, just damping spring's both ends are fixed respectively on the end of damping piston pipe assembly and damping piston rod assembly.
Preferably, the damping piston tube assembly comprises a speed reducing piston tube, a piston cover and a piston limiting plate, wherein the speed reducing piston tube comprises an opening end and a closing end, the closing end of the speed reducing piston tube is hinged to the hole wall of the square groove hole of the L-shaped connecting plate, the piston cover is arranged at the opening end of the speed reducing piston tube, a piston rod through hole is formed in the piston cover, the piston limiting plate is arranged in the speed reducing piston tube, and air holes are formed in the piston limiting plate; the damping piston rod assembly comprises a piston rod base, a cylindrical limiting base, a piston rod, a piston sheet and a metal telescopic corrugated pipe, wherein one end of the piston rod base is hinged to the movable plate, and the cylindrical limiting base is arranged on the axis of the other end of the piston rod base; the piston sheet is arranged in the speed reduction piston pipe, the piston rod penetrates through the through hole of the piston rod, one end of the piston rod is arranged on the piston sheet, and the other end of the piston rod is arranged on the axis of the cylindrical limiting base; the metal telescopic corrugated pipe is sleeved outside the cylindrical limiting base and the piston rod, one end of the metal telescopic corrugated pipe is fixed on the piston cover, and the other end of the metal telescopic corrugated pipe is fixed on the plug rod base; the damping spring is arranged on the outer sides of the speed reducing piston pipe and the metal telescopic corrugated pipe, and two ends of the damping spring are respectively fixed on the closed end of the speed reducing piston pipe and the piston rod base.
Preferably, the closed end of the speed reducing piston tube of the damping piston tube assembly is hinged to the hole wall of the square groove hole of the L-shaped connecting plate through a universal hinge device, and one end of the piston rod base of the damping piston rod assembly is hinged to the movable plate through a universal hinge device.
Preferably, the transverse wing plate of the L-shaped connecting plate is fixed on the H-shaped steel beam through bolts or welding.
Preferably, a bolt hole is formed in the embedded part, an internal thread is formed in the bolt hole, the high-strength bolt is composed of a screw and a nut, an external thread is formed on the screw of the high-strength bolt, and the internal thread of the bolt hole is interfered with the external thread of the screw; and friction ribs are arranged on the outer surface of the embedded part.
Preferably, double-layer reinforcing steel bar nets are arranged in the ALC external wall panel, tie reinforcing steel bars are arranged between the two layers of reinforcing steel bar nets,
preferably, the embedded part and the ALC external wall panel are integrally formed.
The invention has the beneficial effects that:
the invention discloses an anti-seismic energy-consumption connecting joint of an assembled external wall panel and an H-shaped steel beam, wherein an L-shaped connecting plate is arranged between the H-shaped steel beam and an ALC external wall panel, two parallel movable plates are arranged in a square groove hole of the L-shaped connecting plate, and a plurality of limiting shock-absorbing devices are uniformly distributed between the two movable plates and the hole wall of the square groove hole of the L-shaped connecting plate, so that the H-shaped steel beam and the ALC external wall panel are elastically connected through the L-shaped connecting plate, and the ALC external wall panel can be ensured to deform in a sliding deformation or swinging deformation mode during an earthquake so as to adapt to the deformation. The anti-seismic energy-consumption connecting joint of the assembled external wallboard and the H-shaped steel beam is simple and practical, has a compact structure, increases the sliding and deformation of the ALC external wallboard through elastic connection, strengthens the connecting strength between the ALC external wallboard and the steel frame, has good anti-seismic property, increases energy consumption through deformation, and is high in overall stress performance, good in stability, convenient and fast to construct, safe and reliable.
Drawings
FIG. 1: the invention has a side view of the structure;
FIG. 2: the structure of the invention is in front view;
FIG. 3: the structure of the limiting and damping device is schematically shown.
Detailed Description
The following description of the embodiments of the present invention is made with reference to the accompanying drawings 1 to 3:
as shown in figures 1, 2 and 3, the anti-seismic energy-consumption connection node of the assembled external wall panel and the H-shaped steel beam comprises the H-shaped steel beam 1, an ALC external wall panel 2 and an L-shaped connection plate 3, wherein the L-shaped connection plate 3 consists of a transverse wing plate and a vertical wing plate, the transverse wing plate of the L-shaped connection plate 3 is fixed on the H-shaped steel beam 1 through bolts or welding, and the vertical wing plate of the L-shaped connection plate 3 is fixed on the ALC external wall panel 2 through high-strength bolts 8.
An embedded part 21 is arranged in the ALC external wall panel 2, bolt holes are arranged in the embedded part 21, internal threads are arranged in the bolt holes, and friction ribs are arranged on the outer surface of the embedded part 21. Double-layer reinforcing steel bar nets are arranged in the ALC external wall panel 2, tie reinforcing steel bars are arranged between the two layers of reinforcing steel bar nets, and the embedded part 21 and the ALC external wall panel 2 are integrally formed. The high-strength bolt 8 is composed of a screw 81 and a nut, an external thread is arranged on the screw 81 of the high-strength bolt 8, and the high-strength bolt 8 is made to be fixed in the embedded part 21 through the interference between the external thread of the screw 81 of the high-strength bolt and the internal thread of the bolt hole of the embedded part 21.
Vertical square groove holes 4 are formed in vertical wing plates of the L-shaped connecting plate 3, two parallel movable plates 5 are arranged in the square groove holes 4, a plurality of limiting soft plates 6 which are parallel to each other are arranged between the two movable plates 5, a plurality of limiting damping devices 7 are evenly distributed between the movable plates 5 and hole walls of the square groove holes 4 of the L-shaped connecting plate 3, and screw rods 81 of high-strength bolts 8 are arranged between the two movable plates 5 of the square groove holes 4.
The limiting and damping device 7 comprises a damping spring 73, a damping piston pipe assembly 71 and a damping piston rod assembly 72 matched with the damping piston pipe assembly 71, one end of the damping piston pipe assembly 71 is hinged on the hole wall of the square groove hole 4 of the L-shaped connecting plate 3, one end of the damping piston rod assembly 72 is hinged on the movable plate 5, the other end of the damping piston rod assembly 72 is arranged inside the other end of the damping piston pipe assembly 71, a damping spring 713 is arranged on the outer side of the damping piston pipe assembly 71 and the damping piston rod assembly 72, and two ends of the damping spring 713 are respectively fixed at the tail ends of the damping piston pipe assembly 71 and the damping piston rod assembly 72.
The damping piston tube assembly 71 comprises a decelerating piston tube 711, a piston cover 712 and a piston limiting plate 713, wherein the decelerating piston tube 711 comprises an opening end and a closing end, the closing end of the decelerating piston tube 711 is hinged to the hole wall of the square groove hole 4 of the L-shaped connecting plate 3, the piston cover 712 is arranged at the opening end of the decelerating piston tube 711, a piston rod through hole 714 is formed in the piston cover 712, the piston limiting plate 713 is arranged in the decelerating piston tube 711, and an air hole 715 is formed in the piston limiting plate 713; the damping piston rod assembly 72 comprises a piston rod base 721, a cylindrical limiting base 722, a piston rod 723, a piston plate 724 and a metal telescopic bellows 725, wherein one end of the piston rod base 721 is hinged on the movable plate 5, and the cylindrical limiting base 722 is arranged on the axis of the other end of the piston rod base 721; the piston plate 724 is arranged in the speed reducing piston pipe 711, the piston rod 723 penetrates through the piston rod through hole 714, one end of the piston rod is arranged on the piston plate 724, and the other end of the piston rod is arranged on the axis of the cylindrical limiting base 722; the metal telescopic bellows 725 is sleeved outside the cylindrical limiting base 722 and the piston rod 723, and one end of the metal telescopic bellows is fixed on the piston cover 712 while the other end is fixed on the plunger rod base 721; the damper spring 713 is disposed outside the speed reducer piston tube 711 and the metal bellows tube 725, and both ends of the damper spring 713 are fixed to the closed end of the speed reducer piston tube 711 and the piston rod base 721, respectively.
The closed end of the speed reducing piston tube 711 of the damping piston tube assembly 71 is hinged on the hole wall of the square slot 4 of the L-shaped connecting plate 3 through a universal hinge device, and one end of the piston rod base 721 of the damping piston rod assembly 72 is hinged on the movable plate 5 through a universal hinge device.
In the earthquake-resistant energy-consumption connection node of the assembled external wall panel and the H-shaped steel beam, when the ALC external wall panel 2 shakes in an earthquake or under other conditions, the high-strength bolt 8 swings between the two movable plates 5 and the two adjacent limiting soft plates 6, and the movable plates 5 and the limiting soft plates 6 play a role in limiting the screw 81 of the high-strength bolt 8.
Through the damping device 7, the elastic connection between the ALC external wall panel 2 and the H-shaped steel beam 1 is achieved, and the ALC external wall panel 2 can deform through sliding deformation or swinging deformation during earthquake to adapt to the deformation of the main body structure. Meanwhile, in the limit damping device 7, the deceleration piston tube 711 of the limit damping device 7 is filled with gas, and when the displacement between the damping piston tube assembly 71 and the damping piston rod assembly 72 changes, the displacement change of the damping piston tube assembly 71 and the damping piston rod assembly 72 is reduced through the compression or expansion of the gas at two sides of the piston sheet 724 inside the deceleration piston tube 711 and the metal telescopic bellows 725 and the damping spring 713, and the damping spring 713 plays a role in buffering; when the distance between the metal sleeve 4 and the metal square tube 3 is extremely small, rigid limit is realized through the blocking effect of the piston limiting plate 713 on the piston sheet and the piston cover 712 on the cylindrical limiting base 722.
The anti-seismic energy-consumption connecting joint of the assembled external wallboard and the H-shaped steel beam is simple and practical, has a compact structure, increases the sliding and deformation of the ALC external wallboard through elastic connection, strengthens the connecting strength between the ALC external wallboard and the steel frame, has good anti-seismic property, increases energy consumption through deformation, and is high in overall stress performance, good in stability, convenient and fast to construct, safe and reliable.
The invention has been described above with reference to the accompanying drawings, it is obvious that the invention is not limited to the specific implementation in the above-described manner, and it is within the scope of the invention to adopt such insubstantial modifications of the inventive concept and solution, or to apply the inventive concept and solution directly to other applications without such modifications.
Claims (8)
1. The anti-seismic energy-consumption connection joint of the assembled external wall panel and the H-shaped steel beam is characterized by comprising the H-shaped steel beam (1), an ALC external wall panel (2) and an L-shaped connection plate (3), wherein the L-shaped connection plate (3) consists of a transverse wing plate and a vertical wing plate, and the transverse wing plate and the vertical wing plate of the L-shaped connection plate (3) are respectively fixed on the H-shaped steel beam (1) and the ALC external wall panel (2); the vertical wing plate of the L-shaped connecting plate (3) is provided with a vertical square groove hole (4), two parallel movable plates (5) are arranged in the square groove hole (4), a plurality of limiting soft plates (6) which are parallel to each other are arranged between the movable plates (5), a plurality of limiting shock absorption devices (7) are uniformly distributed between the movable plates (5) and the hole wall of the square groove hole (4) of the L-shaped connecting plate (3), the vertical wing plate of the L-shaped connecting plate (3) is fixed on the ALC external wall plate (2) through high-strength bolts (8), the high-strength bolts (8) are installed between the two movable plates (5) of the square groove hole (4), an embedded part (21) is arranged in the ALC external wall plate (2), and the front ends of the high-strength bolts (8) are fixed in the embedded part (21).
2. The anti-seismic and energy-consuming connection node of the fabricated external wall panel and the H-shaped steel beam as claimed in claim 1, characterized in that the limiting and damping device (7) comprises a damping spring (73), a damping piston pipe assembly (71) and a damping piston rod assembly (72) matched with the damping piston pipe assembly (71), one end of the damping piston pipe component (71) is hinged on the hole wall of the square groove hole (4) of the L-shaped connecting plate (3), one end of the damping piston rod assembly (72) is hinged on the movable plate (5), the other end of the damping piston rod assembly (72) is arranged inside the other end of the damping piston pipe assembly (71), the damping spring (713) is arranged outside the damping piston tube assembly (71) and the damping piston rod assembly (72), and both ends of the damping spring (713) are respectively fixed to the ends of the damping piston tube assembly (71) and the damping piston rod assembly (72).
3. The earthquake-resistant energy-consumption connection node of the fabricated external wall panel and the H-shaped steel beam as claimed in claim 2, wherein the damping piston tube assembly (71) comprises a decelerating piston tube (711), a piston cover (712) and a piston limiting plate (713), the decelerating piston tube (711) comprises an open end and a closed end, the closed end of the decelerating piston tube (711) is hinged to the wall of the square groove hole (4) of the L-shaped connecting plate (3), the piston cover (712) is arranged at the open end of the decelerating piston tube (711), the piston cover (712) is provided with a piston rod through hole (714), the piston limiting plate (713) is arranged in the decelerating piston tube (711), and the piston limiting plate (713) is provided with an air vent (715); the damping piston rod assembly (72) comprises a piston rod base (721), a cylindrical limiting base (722), a piston rod (723), a piston sheet (724) and a metal telescopic corrugated pipe (725), wherein one end of the piston rod base (721) is hinged to the movable plate (5), and the cylindrical limiting base (722) is arranged on the axis of the other end of the piston rod base (721); the piston sheet (724) is arranged in the speed reducing piston pipe (711), the piston rod (723) penetrates through the piston rod through hole (714), one end of the piston rod is arranged on the piston sheet (724), and the other end of the piston rod is arranged on the axis of the cylindrical limiting base (722); the metal telescopic corrugated pipe (725) is sleeved outside the cylindrical limiting base (722) and the piston rod (723), one end of the metal telescopic corrugated pipe is fixed on the piston cover (712), and the other end of the metal telescopic corrugated pipe is fixed on the stopper rod base (721); the damping spring (713) is arranged on the outer side of the speed reducing piston pipe (711) and the metal telescopic corrugated pipe (725), and two ends of the damping spring (713) are respectively fixed to the closed end of the speed reducing piston pipe (711) and the piston rod base (721).
4. The earthquake-resistant energy-dissipation connecting joint of the fabricated external wall panel and the H-shaped steel beam as claimed in claim 3, wherein the closed end of the speed-reducing piston tube (711) of the damping piston tube assembly (71) is hinged on the hole wall of the square slotted hole (4) of the L-shaped connecting plate (3) through a universal hinge device, and one end of the piston rod base (721) of the damping piston rod assembly (72) is hinged on the movable plate (5) through a universal hinge device.
5. An earthquake-resistant and energy-consuming connection joint of an assembled external wall panel and an H-shaped steel beam as claimed in claim 1, wherein the transverse wing panel of the L-shaped connection plate (3) is fixed on the H-shaped steel beam (1) through bolts or welding.
6. The earthquake-resistant and energy-consuming connection node of the assembled external wall panel and the H-shaped steel beam is characterized in that bolt holes are formed in the embedded parts (21), internal threads are formed in the bolt holes, the high-strength bolt (8) is composed of a screw rod (81) and a nut, external threads are formed on the screw rod (81) of the high-strength bolt (8), and the internal threads of the bolt holes are interfered with the external threads of the screw rod (81); and friction ribs are arranged on the outer surface of the embedded part (21).
7. An earthquake-resistant energy-dissipation connecting joint of an assembled external wall panel and an H-shaped steel beam as claimed in claim 1, wherein a double-layer steel bar mesh is arranged in the ALC external wall panel (2), and tie bars are arranged between the two layers of steel bar mesh.
8. The earthquake-resistant energy-dissipation connecting joint of the fabricated external wall panel and the H-shaped steel beam as claimed in claim 1, wherein the embedded part (21) and the ALC external wall panel (2) are integrally formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110123405.4A CN112900640A (en) | 2021-01-29 | 2021-01-29 | Anti-seismic energy-consumption connecting joint of assembled external wall panel and H-shaped steel beam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110123405.4A CN112900640A (en) | 2021-01-29 | 2021-01-29 | Anti-seismic energy-consumption connecting joint of assembled external wall panel and H-shaped steel beam |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112900640A true CN112900640A (en) | 2021-06-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110123405.4A Withdrawn CN112900640A (en) | 2021-01-29 | 2021-01-29 | Anti-seismic energy-consumption connecting joint of assembled external wall panel and H-shaped steel beam |
Country Status (1)
| Country | Link |
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| CN (1) | CN112900640A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113202194A (en) * | 2021-05-14 | 2021-08-03 | 安徽建筑大学 | ALC wallboard connecting assembly and integrated configuration of antidetonation power consumption |
| CN113417384A (en) * | 2021-07-23 | 2021-09-21 | 南通大学 | Connecting node of steel frame structure external wall board |
| CN115045416A (en) * | 2022-06-28 | 2022-09-13 | 中建五局华东建设有限公司 | Assembly type steel structure building masonry wall top connecting piece and using method thereof |
-
2021
- 2021-01-29 CN CN202110123405.4A patent/CN112900640A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113202194A (en) * | 2021-05-14 | 2021-08-03 | 安徽建筑大学 | ALC wallboard connecting assembly and integrated configuration of antidetonation power consumption |
| CN113417384A (en) * | 2021-07-23 | 2021-09-21 | 南通大学 | Connecting node of steel frame structure external wall board |
| CN115045416A (en) * | 2022-06-28 | 2022-09-13 | 中建五局华东建设有限公司 | Assembly type steel structure building masonry wall top connecting piece and using method thereof |
| CN115045416B (en) * | 2022-06-28 | 2023-12-01 | 中建五局华东建设有限公司 | Assembled steel structure building masonry wall top connecting piece and use method thereof |
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Application publication date: 20210604 |
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