Steel structure and outer curtain wall interlayer connecting system and construction method thereof

Abstract

A steel structure and exterior curtain wall interlayer connection system and its construction method are disclosed, comprising steel beams, a top slab, an exterior curtain wall, supporting joists, an infill layer, a bottom sealing plate, side sealing plates, and horizontal tie rods; diagonal bracing is provided between the steel beams and the top slab; the lower end of the diagonal bracing is connected to the steel beam, and the upper end of the diagonal bracing is supported at the bottom of the top slab near the edge; the supporting joists are located between the top slab and the strip-shaped exterior wall; the bottom sealing plate is located between the bottom of the steel beam and the strip-shaped exterior wall; the side sealing plates are located between the top slab and the strip-shaped exterior wall, and are attached to the outer surface of the supporting joists; the outer surface of the side sealing plates is vertically flush with the outer surface of the strip-shaped exterior wall; horizontal tie rods are installed between the side sealing plates and the steel beams; the infill layer fills the cavity formed by the bottom sealing plate, side sealing plates, top slab, and steel beams, and an isolation layer is provided between the outer surface of the infill layer and the side sealing plates; the exterior curtain wall is attached to the outer surface of the side sealing plates. This invention solves the technical problem that the exterior wall panels cannot extend to the roof slab, thus creating cold bridges and leakage points between the exterior wall panels and the roof slab.

Description

Technical Field

[0001] This invention belongs to the field of building construction technology, specifically a steel structure and external curtain wall interlayer connection system and its construction method. Background Technology

[0002] In a steel structure building, a roof slab is installed on top of steel beams, and a strip-panel exterior wall is installed on the roof slab, located on the outer side of the steel beams; the exterior curtain wall is located on the outer side of the steel structure. In this structure, because of the cantilevered portion of the roof slab outside the steel beams, and the existence of steel ribs and angle steel bracing between the steel beams and the cantilever slab, the strip-panel exterior wall cannot be fixed to the roof slab; it can only be installed up to the bottom elevation of the steel beams. This creates a thermal bridge and leakage point between the strip-panel exterior wall and the roof slab, requiring clearly defined treatment points to ensure that thermal bridging and leakage are prevented. In traditional steel structure and curtain wall systems, the curtain wall system is directly connected to the main structural columns or beams via connectors, which does not provide similar experience. Summary of the Invention

[0003] The purpose of this invention is to provide a connection system between steel structure and exterior curtain wall, which solves the technical problem that the strip-panel exterior wall cannot extend to the top slab, thus forming a cold bridge and leakage point between the strip-panel exterior wall and the top slab.

[0004] To achieve the above objectives, the present invention adopts the following technical solution.

[0005] A steel structure and exterior curtain wall interlayer connection system includes a steel structure and an exterior curtain wall; the steel structure includes steel beams and a top plate; the steel beams are arranged at the bottom of the top plate and are spaced apart from the edge of the top plate; the exterior curtain wall is set on the outside of the steel structure; a strip wall is set on the ground along the edge of the top plate, and a gap is left between the top of the strip wall and the bottom surface of the top plate;

[0006] A diagonal brace is provided between the steel beam and the top plate; there is a set of diagonal braces, which are arranged at intervals along the long axis of the steel beam, and the lower end of the diagonal brace is fixedly connected to the steel beam, while the upper end of the diagonal brace is supported at the bottom of the top plate, near the edge of the top plate.

[0007] The steel structure and exterior curtain wall interlayer connection system also includes a supporting keel, a filling layer, a bottom sealing plate, side sealing plates, and horizontal tie rods. The supporting keel is installed between the top slab and the strip wall, and the inner end of the supporting keel is fixedly connected to the steel beam. The outer side of the supporting keel does not extend beyond the outer side of the top slab. The bottom sealing plate is installed in the gap between the bottom of the steel beam and the strip wall. An interior decorative layer is installed on the inner side of the steel beam, the bottom surface of the bottom sealing plate, and the inner side of the strip wall. The side sealing plate is installed between the top slab and the strip wall, and is attached to the outer side of the supporting keel. The outer side of the side sealing plate is vertically flush with the outer side of the strip wall.

[0008] The horizontal tie rod is installed between the side sealing plate and the steel beam. The inner end of the horizontal tie rod is fixedly connected to the outer side of the steel beam, and the outer end of the horizontal tie rod passes through the side sealing plate. The filling layer fills the cavity formed by the bottom sealing plate, the side sealing plate, the top plate and the steel beam. An isolation layer is provided between the outer side of the filling layer and the side sealing plate.

[0009] The outer curtain wall is attached to the outside of the side sealing plate and connected to the supporting keel by fasteners.

[0010] Preferably, the steel beam has an I-shaped cross-section, and shear bolts are spaced apart at the top of the steel beam; the shear bolts extend into the top plate reinforcement bars inside the top plate and are cast into the concrete of the top plate.

[0011] Preferably, stiffening plates are longitudinally spaced between the upper and lower flanges of the steel beam and on both sides of the web; the diagonal brace is correspondingly arranged with the stiffening plate, and the lower part of the diagonal brace is fixedly connected to the stiffening plate on the corresponding side.

[0012] Preferably, the supporting keel includes a supporting frame and longitudinal braces; there is a set of supporting frames arranged at intervals along the longitudinal direction; the supporting frame includes an upper horizontal bar, a lower horizontal bar, and a vertical bar; one end of the lower horizontal bar is fixedly connected to a steel beam, and the other end of the lower horizontal bar is connected to the top of the outer wall of the strip panel; the vertical bar is connected to the outer end of the lower horizontal bar; the upper horizontal bar is connected to the inner side of the top of the vertical bar, and the upper horizontal bar is connected to the top plate by expansion bolts; the longitudinal braces are connected between the lower horizontal bars of adjacent supporting frames, near the outer end of the lower horizontal bar.

[0013] Preferably, vertical strips are longitudinally spaced within the filling layer, near the outer side of the steel structure; the upper end of the vertical strip is connected to the top of the supporting keel, and the lower end of the vertical strip is connected to the bottom of the supporting keel.

[0014] Preferably, a pressure plate is provided at the top outer corner of the strip wall; the pressure plate is strip-shaped and has an L-shaped cross-section; the bottom outer side of the supporting keel is connected to the pressure plate; holes are provided longitudinally at intervals on the outer surface of the strip wall and at the bottom of the pressure plate; hook bolts are provided in the holes; the outer end of the hook bolt is welded to the lower part of the outer side of the pressure plate.

[0015] Preferably, the side sealing plate is made of GRC plate, and the thickness of the side sealing plate is not less than 10mm.

[0016] A construction method for a steel structure and external curtain wall interlayer connection system includes the following steps:

[0017] Step 1: Construction of steel structure: When constructing the panel exterior wall, leave a gap between the top of the panel exterior wall and the bottom of the top plate.

[0018] Step 2: Construct supporting joists on the outside of the steel beams. The supporting joists are installed between the outer wall panel and the roof panel, and the inner ends of the supporting joists are fixedly connected to the steel beams.

[0019] Step 3: Horizontal tie rods are welded at intervals on the outer side of the steel beam, facing the outside.

[0020] Step 4: Construct the bottom sealing plate to seal the gap between the outer wall panel and the steel beam.

[0021] Step 5: Construction of the filling layer: The filling layer is constructed in the cavity formed by the bottom sealing plate, the top plate, and the steel beam.

[0022] Step Six: After the filling layer is completed, separate the isolation layer and the side sealing plate from the inside out on the outer side of the filling layer. Finally, use horizontal tie rods to firmly fix the side sealing plate to the steel beam.

[0023] Step 7: An interior decorative layer is installed on the inner side of the steel beam, the bottom surface of the bottom sealing plate, and the inner side of the strip wall.

[0024] Step 8: Construction of the exterior curtain wall, marking the completion of construction.

[0025] Preferably, the bottom sealing plate is made of plate units connected together, with adjacent plate units overlapping each other, and the overlap length is not less than 100mm.

[0026] Preferably, the specific method for constructing the supporting keel on the outside of the steel beam in step two is as follows:

[0027] Step 1: Weld a lower crossbar to the lower part of the outer side of the steel beam. The lower crossbar is placed horizontally and its inner end is fully welded to the steel beam.

[0028] Step 2: Weld a continuous vertical rod to the outer end of the lower horizontal bar;

[0029] Step 3: Weld a horizontal bar to the inside of the top of the vertical bar, and connect the upper horizontal bar to the top plate with expansion bolts.

[0030] Compared with the prior art, the present invention has the following features and beneficial effects.

[0031] 1. The present invention addresses the interlayer treatment of the exterior wall panels and the exterior curtain wall using steel beams to connect and support the exterior wall panels. Side sealing plates are installed above the exterior wall panels for waterproofing. To ensure secure insulation, horizontal tie rods are installed on the steel beams and secured with dovetail nuts. This method effectively solves the installation problems of exterior wall panels when there are cantilevered slabs in the steel structure. This method can be applied regardless of whether the exterior wall decoration is a curtain wall or an insulation coating. This method ensures the installation of the exterior wall panels; the pressure plate effectively fixes the exterior wall panels; the double-layer waterproofing of the side sealing plates and the isolation layer effectively prevents water seepage from the exterior wall; and the design of the gaps between the steel beams effectively ensures the insulation at this location, preventing insulation from falling off. The technical system of this invention, through innovative structural design, material combination, and construction technology, systematically solves key technical problems such as cold bridging, leakage, and deformation control in the interlayer connection between the steel structure and the exterior curtain wall in high-rise steel structure buildings. It provides a brand-new solution for curtain wall engineering of super high-rise buildings, possessing significant technological advancement and engineering promotion value.

[0032] 2. This invention utilizes a combination of supporting keel, filling layer, and double-layer sealing plate to create a continuous, enclosed space between the exterior wall and the roof slab. The supporting keel establishes a structural transition, the filling layer blocks the heat conduction path, and the bottom and side sealing plates form a physical isolation layer, completely eliminating the cold bridging phenomenon in traditional structures. Simultaneously, this invention features a unique four-level waterproofing system: "exterior curtain wall - isolation layer - side sealing plate - filling layer." The GRC side sealing plate combines structural strength and waterproofing performance, the isolation layer uses galvanized iron sheet, and combined with the density of the filling layer, forms a gradient waterproof barrier, eliminating the risk of leakage and achieving dual elimination of cold bridging and leakage.

[0033] 3. In this invention, the diagonal braces and stiffening plates work together. The diagonal braces are arranged according to the spacing of the stiffening plates to form an effective force transmission path, effectively transferring the cantilever load to the web of the steel beam, thus effectively improving the load-bearing capacity of the cantilever structure. Furthermore, the three-dimensional keel support system adopts a stable structure of upper / lower horizontal bars + vertical bars, and the longitudinal braces enable multi-frame linkage, giving the curtain wall system strong wind pressure resistance. Simultaneously, this invention pre-embeds stainless steel hook bolts in the exterior wall of the panel and sets pressure plates at the top outer corner of the panel exterior wall. The hook bolts and pressure plates form a mechanical connection, and the supporting keel is welded to the pressure plates. This forms a more complete support system, transferring the load from the panel exterior wall to the supporting keel, and then to the steel beam, enhancing the overall structural stability and preventing displacement of the panel exterior wall due to wind loads or other lateral forces. The pressure plate, as a reinforcing component at the corner, forms a continuous support frame through connection with the supporting keel, improving torsional resistance.

[0034] 4. This invention employs horizontal tie rods, and pre-tensioning technology can apply pre-tensioning force to effectively control the deformation of the side sealing panels and ensure the flatness of the facade. Simultaneously, galvanized steel vertical strips are installed within the infill layer, forming a three-dimensional grid with the supporting keel, thereby enhancing the interlayer shear stiffness. Attached Figure Description

[0035] The present invention will now be described in further detail with reference to the accompanying drawings.

[0036] Figure 1 This is a structural schematic diagram of the steel structure and external curtain wall interlayer connection system of the present invention.

[0037] Figure 2 This is a schematic diagram of the structure in this invention where the supporting keel is set between the top plate and the outer wall of the strip plate.

[0038] Figure 3 This is a schematic diagram of the support frame in this invention.

[0039] Figure 4 This is a schematic diagram of the connection structure between the steel beam and the diagonal brace in this invention.

[0040] Figure 5 This is a schematic diagram of the structure in this invention where the shear bolts at the top of the steel beam extend into the floor slab.

[0041] Attached reference numerals: 1-steel beam, 2-top plate, 3-exterior wall panel, 4-diagonal brace, 5-supporting keel, 5.1-supporting frame, 5.1.1-upper horizontal bar, 5.1.2-lower horizontal bar, 5.1.3-vertical bar, 5.2-longitudinal brace, 6-filling layer, 7-bottom sealing plate, 8-side sealing plate, 9-horizontal tie rod, 10-interior decorative layer, 11-fixture, 12-shear bolt, 13-stiffening plate, 14-expansion bolt, 15-vertical strip, 16-isolation layer, 17-glass window, 18-horizontal support, 19-composite thermal insulation rock wool, 20-exterior panel, 21-longitudinal connecting rod, 22-pressure plate, 23-hook bolt. Detailed Implementation

[0042] like Figure 1-5 As shown, this steel structure and exterior curtain wall interlayer connection system includes a steel structure and an exterior curtain wall; the steel structure includes steel beams 1 and a top plate 2; the steel beams 1 are arranged at the bottom of the top plate 2 and have a gap between them and the edge of the top plate 2; steel columns are supported at the bottom of the steel beams 1; the exterior curtain wall is set on the outside of the steel structure; characterized in that: a strip-shaped exterior wall 3 is set on the ground along the edge of the top plate 2, and a gap is left between the top of the strip-shaped exterior wall 3 and the bottom surface of the top plate 2; the gap between the strip-shaped exterior wall 3 and the bottom surface of the top plate 2 is adapted to the height of the steel beams 1; the gap between the strip-shaped exterior wall 3 and the top plate 2 is 200mm~300mm; glass windows 17 can also be set on the strip-shaped exterior wall 3;

[0043] A diagonal brace 4 is provided between the steel beam 1 and the top plate 2; there is a set of diagonal braces 4, which are arranged at intervals along the long axis of the steel beam 1, and the lower end of the diagonal brace 4 is fixedly connected to the steel beam 1, and the upper end of the diagonal brace 4 is supported at the bottom of the top plate 2, near the edge of the top plate 2; a horizontal support 18 is provided between the upper end of the diagonal brace 4 and the steel beam 1, and the horizontal support 18, the diagonal brace 4 and the steel beam 1 together form a triangular support; the triangular support is supported at the bottom of the cantilevered part of the top plate 2;

[0044] The steel structure and exterior curtain wall interlayer connection system also includes a supporting keel 5, a filling layer 6, a bottom sealing plate 7, a side sealing plate 8, and a horizontal tie rod 9; the supporting keel 5 is set between the top plate 2 and the strip wall 3, and the inner end of the supporting keel 5 is fixedly connected to the steel beam 1, and the outer side of the supporting keel 5 does not extend beyond the outer side of the top plate 2; the bottom sealing plate 7 is set in the gap between the bottom of the steel beam 1 and the strip wall 3; an interior decorative layer 10 is set on the inner side of the steel beam 1, the bottom surface of the bottom sealing plate 7, and the inner side of the strip wall 3; the side sealing plate 8 is set between the top plate 2 and the strip wall 3, and the side sealing plate 8 is attached to the outer side of the supporting keel 5; the outer side of the side sealing plate 8 is vertically flush with the outer side of the strip wall 3;

[0045] The horizontal tie rod 9 is installed between the side sealing plate 8 and the steel beam 1. The inner end of the horizontal tie rod 9 is fixedly connected to the outer side of the steel beam 1, and the outer end of the horizontal tie rod 9 passes through the side sealing plate 8. The outer end of the horizontal tie rod 9 is threaded and fastened to the side sealing plate 8 by a nut. A through hole is provided on the side sealing plate 8 at the position corresponding to the horizontal tie rod 9 to pass through. The filling layer 6 fills the cavity formed by the bottom sealing plate 7, the side sealing plate 8, the top plate 2 and the steel beam 1. An isolation layer 16 is provided between the outer side of the filling layer 6 and the side sealing plate 8.

[0046] The external curtain wall is attached to the outside of the side sealing plate 8, the strip wall 3, and the top plate 2, and is connected to the supporting keel 5, the strip wall 3, and the top plate 2 by fasteners 11; the external curtain wall includes composite thermal insulation rock wool 19 and exterior decorative panels 20; the fasteners 11 are rivets or anchors. In this embodiment, the steel beam 1 has an I-shaped cross-section, and shear bolts 12 are spaced apart at the top of the steel beam 1; the shear bolts 12 extend into the top plate reinforcement in the top plate 2 and are poured into the concrete of the top plate 2.

[0047] In this embodiment, stiffening plates 13 are longitudinally spaced between the upper and lower flanges of the steel beam 1 and on both sides of the web; the diagonal brace 4 is correspondingly arranged with the stiffening plates 13, and the lower part of the diagonal brace 4 is fixedly connected to the stiffening plate 13 on the corresponding side.

[0048] In this embodiment, the supporting keel 5 includes a supporting frame 5.1 and longitudinal braces 5.2; there is a set of supporting frames 5.1, arranged at intervals along the longitudinal direction; the supporting frame 5.1 includes an upper horizontal bar 5.1.1, a lower horizontal bar 5.1.2, and a vertical bar 5.1.3; one end of the lower horizontal bar 5.1.2 is fixedly connected to the steel beam 1, and the other end of the lower horizontal bar 5.1.2 is connected to the top of the strip wall 3; the vertical bar 5.1.3 is connected to the outer end of the lower horizontal bar 5.1.2; the upper horizontal bar 5.1.1 is connected to the inner top of the vertical bar 5.1.3, and the upper horizontal bar 5.1.1 is connected to the top plate 2 by expansion bolts 14; the longitudinal braces 5.2 are connected between the lower horizontal bars 5.1.2 of adjacent supporting frames 5.1, near the outer end of the lower horizontal bar 5.1.2.

[0049] In this embodiment, vertical strips 15 are longitudinally spaced within the filling layer 6, near the outer side of the steel structure; the upper end of the vertical strip 15 is connected to the top of the supporting keel 5, and the lower end of the vertical strip 15 is connected to the bottom of the supporting keel 5; specifically, the upper and lower ends of the vertical strip 15 are respectively provided with folded edges, and the upper folded edge of the vertical strip 15 is connected to the upper crossbar 5.1.1 by screws, and the lower folded edge of the vertical strip 15 is connected to the longitudinal brace 5.2 by screws.

[0050] In this embodiment, a pressure plate 22 is provided at the top outer corner of the strip wall 3; the pressure plate 22 is strip-shaped and has an L-shaped cross-section; the pressure plate 22 is made of angle steel and covers the top outer corner of the strip wall 3 to fix the upper part of the strip wall 3; the bottom outer side of the supporting keel 5 is connected to the pressure plate 22, one end of the lower crossbar 5.1.2 is welded to the lower flange plate of the steel beam 1, and the other end of the lower crossbar 5.1.2 is welded to the pressure plate 22; holes are provided longitudinally at intervals on the outer surface of the strip wall 3, located at the bottom of the pressure plate 22; hook bolts 23 are provided in the holes; the hook head of the hook bolt 23 is welded to the lower part of the outer side of the pressure plate 22, and the spacing between adjacent hook bolts 23 is no more than 500mm.

[0051] In this embodiment, the side sealing plate 8 is made of GRC plate, and the thickness of the side sealing plate 8 is not less than 10mm.

[0052] The construction method for this steel structure and external curtain wall interlayer connection system includes the following steps.

[0053] Step 1: Construction of steel structure: The steel columns, steel beams and top slab of the steel structure are constructed first, and the walls are filled last; when constructing the strip wall 3, a gap is left between the top of the strip wall 3 and the bottom of the top slab 2; the reinforcing bars of the top slab 2 are tied to the top surface of the steel beam 1 and connected to the steel beam 1.

[0054] Step 2: Construct supporting keel 5 on the outside of steel beam 1. Supporting keel 5 is installed between the strip wall 3 and the top plate 2, and the inner end of supporting keel 5 is fixedly connected to steel beam 1.

[0055] Step 3: Horizontal tie rods 9 are welded at intervals on the outer side of steel beam 1, facing the outside. The horizontal tie rods 9 are made of screw steel bars with a length of 600mm and a diameter of 10mm. Screws are machined at the ends of the horizontal tie rods 9. The horizontal tie rods 9 are arranged in a quincunx pattern with a spacing of 500mm.

[0056] Step 4: Construct the bottom sealing plate 7. The bottom sealing plate 7 is made of 1.5mm thick galvanized iron sheet and seals the gap between the outer wall 3 and the steel beam 1. The iron sheet is fixed with nails at 300mm intervals.

[0057] Step 5: Construction of filling layer 6: Filling layer 6 is constructed in the cavity formed by bottom sealing plate 7, top plate 2 and steel beam 1. Filling layer 6 is made of thermal insulation rock wool.

[0058] Step Six: After the filling layer 6 is filled, the isolation layer 16 and the side sealing plate 8 are sequentially installed on the outer side of the filling layer 6 from the inside out. The isolation layer 16 is made of a 1mm galvanized iron sheet and is installed on the outside of a set of vertical rods 5.1.3 and fixed to the vertical rods 5.1.3 by hook bolts. The side sealing plate 8 is made of a 10mm GRC plate and the outer side of the side sealing plate 8 is vertically aligned with the outer side of the strip wall 3 and the top plate 2. Finally, the side sealing plate 8 is fixed to the steel beam 1 by screwing dovetail nuts on the outer end of the horizontal tie rod 9. Excess screws are cut off.

[0059] Step 7: An interior decorative layer 10 is provided on the inner side of the steel beam 1, the bottom surface of the bottom sealing plate 7, and the inner side of the strip wall 3.

[0060] Step 8: Construction of the exterior curtain wall, marking the completion of construction.

[0061] In this embodiment, the bottom sealing plate 7 is made of plate units connected together. Adjacent plate units are connected by overlapping. The plate units are made of sheet metal and the overlap length is not less than 100mm. A longitudinal connecting rod 21 is usually provided at the bottom of the outer side of the steel beam 1. One side of the bottom sealing plate 7 is connected to the inner side of the strip wall 3 by screws. The other side of the bottom sealing plate 7 is connected to the longitudinal connecting rod 21 by screws. The gaps at both ends of the bottom sealing plate 7 and the overlap gaps are sealed with sealant.

[0062] In this embodiment, the specific method for constructing the supporting keel 5 on the outside of the steel beam 1 in step two is as follows:

[0063] Step 1: Weld the lower crossbar 5.1.2 to the lower part of the outer side of the steel beam 1. The lower crossbar 5.1.2 is made of 10# channel steel, with a spacing of 600mm, and is placed horizontally. The inner end of the lower crossbar 5.1.2 is fully welded to the steel beam 1.

[0064] Step 2: Weld a continuous vertical rod 5.1.3 to the outer end of the lower horizontal bar 5.1.2. The vertical rod 5.1.3 is made of angle steel.

[0065] Step 3: Weld a horizontal bar 5.1.1 to the top inner side of the vertical bar 5.1.3, and connect the upper horizontal bar 5.1.1 to the top plate 2 with expansion bolts 14. The upper horizontal bar 5.1.1 is made of angle steel.

[0066] The above embodiments are not exhaustive examples of specific implementation methods, and other embodiments are also possible. The purpose of the above embodiments is to illustrate the present invention, rather than to limit the scope of protection of the present invention. All applications derived from simple variations of the present invention fall within the scope of protection of the present invention.

Claims

1. A steel structure and external curtain wall interlayer connection system, comprising a steel structure and an external curtain wall; the steel structure comprising a steel beam (1) and a top plate (2); the steel beam (1) is arranged at the bottom of the top plate (2) and has a gap between it and the edge of the top plate (2); the external curtain wall is arranged on the outside of the steel structure; characterized in that: A strip wall (3) is provided on the ground along the edge of the top plate (2), and a gap is left between the top of the strip wall (3) and the bottom of the top plate (2); A diagonal brace (4) is provided between the steel beam (1) and the top plate (2); there is a set of diagonal braces (4), which are arranged at intervals along the long axis of the steel beam (1), and the lower end of the diagonal brace (4) is fixedly connected to the steel beam (1), and the upper end of the diagonal brace (4) is supported at the bottom of the top plate (2) near the edge of the top plate (2); The steel structure and the external curtain wall interlayer connection system also includes a supporting keel (5), a filling layer (6), a bottom sealing plate (7), a side sealing plate (8), and a horizontal tie rod (9); the supporting keel (5) is set between the top plate (2) and the strip wall (3), and the inner end of the supporting keel (5) is fixedly connected to the steel beam (1), and the outer side of the supporting keel (5) does not extend beyond the outer side of the top plate (2); the bottom sealing plate (7) is set in the gap between the bottom of the steel beam (1) and the strip wall (3); an interior decoration layer (10) is set on the inner side of the steel beam (1), the bottom surface of the bottom sealing plate (7), and the inner side of the strip wall (3); the side sealing plate (8) is set between the top plate (2) and the strip wall (3), and the side sealing plate (8) is attached to the outer side of the supporting keel (5); the outer side of the side sealing plate (8) is vertically flush with the outer side of the strip wall (3); The horizontal tie rod (9) is installed between the side sealing plate (8) and the steel beam (1). The inner end of the horizontal tie rod (9) is fixedly connected to the outer side of the steel beam (1), and the outer end of the horizontal tie rod (9) passes through the side sealing plate (8). The filling layer (6) fills the cavity formed by the bottom sealing plate (7), the side sealing plate (8), the top plate (2) and the steel beam (1). An isolation layer (16) is provided between the outer side of the filling layer (6) and the side sealing plate (8). The outer curtain wall is attached to the outside of the side sealing plate (8) and connected to the supporting keel (5) by fasteners (11).

2. The steel structure and external curtain wall interlayer connection system according to claim 1, characterized in that: The steel beam (1) has an I-shaped cross section and shear bolts (12) are spaced apart at the top of the steel beam (1); the shear bolts (12) extend into the top plate reinforcement in the top plate (2) and are poured into the concrete of the top plate (2).

3. The steel structure and external curtain wall interlayer connection system according to claim 2, characterized in that: The steel beam (1) has stiffening plates (13) spaced longitudinally between the upper and lower flanges and on both sides of the web; the diagonal brace (4) is provided in correspondence with the stiffening plate (13), and the lower part of the diagonal brace (4) is fixedly connected to the stiffening plate (13) on the corresponding side.

4. The steel structure and external curtain wall interlayer connection system according to claim 1, characterized in that: The supporting keel (5) includes a supporting frame (5.1) and longitudinal bracing (5.2); the supporting frame (5.1) is a set, arranged at intervals along the longitudinal direction; the supporting frame (5.1) includes an upper horizontal bar (5.1.1), a lower horizontal bar (5.1.2), and a vertical bar (5.1.3); one end of the lower horizontal bar (5.1.2) is fixedly connected to the steel beam (1), and the other end of the lower horizontal bar (5.1.2) is connected to the top of the strip wall (3). The vertical rod (5.1.3) is connected to the outer end of the lower horizontal rod (5.1.2); the upper horizontal rod (5.1.1) is connected to the inner top of the vertical rod (5.1.3), and the upper horizontal rod (5.1.1) is connected to the top plate (2) by expansion bolts (14); the longitudinal brace (5.2) is connected between the lower horizontal rods (5.1.2) of the adjacent support frame (5.1) at a position close to the outer end of the lower horizontal rod (5.1.2).

5. The steel structure and external curtain wall interlayer connection system according to claim 1, characterized in that: Vertical strips (15) are longitudinally spaced within the filling layer (6) near the outer side of the steel structure; the upper end of the vertical strips (15) is connected to the top of the supporting keel (5), and the lower end of the vertical strips (15) is connected to the bottom of the supporting keel (5).

6. The steel structure and external curtain wall interlayer connection system according to claim 1, characterized in that: A pressure plate (22) is provided at the top outer corner of the strip wall (3); the pressure plate (22) is strip-shaped and the cross-section of the pressure plate (22) is L-shaped; the bottom outer side of the supporting keel (5) is connected to the pressure plate (22); holes are provided longitudinally at intervals on the outer surface of the strip wall (3) and at the bottom of the pressure plate (22); hook bolts (23) are provided in the holes; the hook head of the hook bolt (23) is welded to the lower part of the outer side of the pressure plate (22).

7. The steel structure and external curtain wall interlayer connection system according to claim 1, characterized in that: The side sealing plate (8) is made of GRC plate and the thickness of the side sealing plate (8) is not less than 10mm.

8. A construction method for the steel structure and external curtain wall interlayer connection system according to any one of claims 1-7, characterized in that, The steps include the following: Step 1: Construction of steel structure: When constructing the strip wall (3), leave a gap between the top of the strip wall (3) and the bottom of the top plate (2); Step 2: Construct supporting keel (5) on the outside of the steel beam (1). The supporting keel (5) is supported between the strip wall (3) and the top plate (2), and the inner end of the supporting keel (5) is fixedly connected to the steel beam (1). Step 3: Horizontal tie rods (9) are welded at intervals on the outer side of the steel beam (1), facing the outside. Step 4: Construct the bottom sealing plate (7) to seal the gap between the strip wall (3) and the steel beam (1); Step 5: Construction of the filling layer (6): The filling layer (6) is constructed in the cavity formed by the bottom sealing plate (7), the top plate (2) and the steel beam (1). Step 6: After the filling layer (6) is filled, the isolation layer (16) and the side sealing plate (8) are placed on the outer side of the filling layer (6) from the inside out. Finally, the side sealing plate (8) is fixed to the steel beam (1) with a horizontal tie rod (9). Step 7: An interior decorative layer (10) is provided on the inner side of the steel beam (1), the bottom surface of the bottom sealing plate (7), and the inner side of the strip wall (3). Step 8: Construction of the exterior curtain wall, marking the completion of construction.

9. The construction method of the steel structure and external curtain wall interlayer connection system according to claim 8, characterized in that: The bottom sealing plate (7) is made of plate units connected together, with two adjacent plate units overlapping each other, and the overlap length is not less than 100mm.

10. The construction method of the steel structure and external curtain wall interlayer connection system according to claim 8, characterized in that: The specific method for constructing the supporting keel (5) on the outside of the steel beam (1) in step two is as follows: Step 1: Weld a lower crossbar (5.1.2) to the lower part of the outer side of the steel beam (1). The lower crossbar (5.1.2) is placed horizontally, and the inner end of the lower crossbar (5.1.2) is fully welded to the steel beam (1). Step 2: Weld a continuous vertical bar (5.1.3) to the outer end of the lower horizontal bar (5.1.2). Step 3: Weld a horizontal bar (5.1.1) to the inner top of the vertical bar (5.1.3) and connect the upper horizontal bar (5.1.1) to the top plate (2) with expansion bolts (14).

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