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

Abstract

The invention discloses a steel structure and outer curtain wall interlayer connecting system and a construction method thereof. The steel structure and outer curtain wall interlayer connecting system comprises a steel beam, a top plate, an outer curtain wall, a supporting keel, a filling layer, a bottom sealing plate, side sealing plates and horizontal pull rods. Inclined struts are arranged between the steel beams and the top plate; the upper ends of the inclined struts are supported at the bottom, close to the edge, of the top plate; the supporting keel is arranged between the top plate and the batten outer wall; the bottom sealing plate is arranged between the bottom of the steel beam and the batten outer wall; the side sealing plates are arranged between the top plate and the batten outer wall and attached to the outer side faces of the supporting keels. The outer side face of the side sealing plate is vertically flush with the outer side face of the batten outer wall. The horizontal pull rods are arranged between the side sealing plates and the steel beams; a cavity defined by the bottom sealing plate, the side sealing plates, the top plate and the steel beams is filled with the filling layer, and an isolation layer is arranged between the outer side face of the filling layer and the side sealing plates; the outer curtain wall is attached to the outer side of the side sealing plate. The technical problem that a cold bridge and a leakage point are formed between a batten outer wall and a top plate due to the fact that the batten outer wall cannot be communicated to the top plate is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of building engineering construction, in particular to a steel structure and outer curtain wall interlayer connection system and a construction method thereof. Background Art

[0002] In a certain steel structure building, the top plate is installed on the top of the steel beam, and a strip board exterior wall is set on the top plate and located outside the steel beam; the exterior curtain wall is set outside the steel structure. In this structure, because there is an external cantilevered part of the top plate outside the steel beam, and there are steel ribs and angle steel braces between the steel beam and the cantilevered plate, the strip board exterior wall cannot be fixed to the top plate and can only be installed to the bottom elevation of the steel beam, which forms a cold bridge and leakage point between the strip board exterior wall and the top plate. Clear processing nodes are required to ensure that no cold bridges and leakage occur. In traditional steel structure and curtain wall systems, the curtain wall system is directly connected to the main structure columns or beams through connectors, and similar experience cannot be provided. Summary of the invention

[0003] The purpose of the present invention is to provide a steel structure and an outer curtain wall interlayer connection system to solve the technical problem that the strip board outer wall cannot reach the top plate, thereby forming a cold bridge and a leakage point between the strip board outer wall and the top plate.

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

[0005] A steel structure and an outer curtain wall interlayer connection system, comprising a steel structure and an outer curtain wall; the steel structure comprises a steel beam and a top plate; the steel beam is arranged at the bottom of the top plate and a gap is left between the steel beam and the edge of the top plate; the outer curtain wall is arranged outside the steel structure; a strip board outer wall is arranged on the ground along the edge of the top plate, and a gap is left between the top of the strip board outer wall and the bottom surface of the top plate; A diagonal brace is provided between the steel beam and the top plate; the diagonal brace has a group and is 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, and the upper end of the diagonal brace is supported at the bottom of the top plate, close to the edge of the top plate; The steel structure and the outer curtain wall interlayer connection system also includes a supporting keel, a filling layer, a bottom sealing plate, a side sealing plate and a horizontal tie rod; the supporting keel is arranged between the top plate and the strip board outer wall, and the inner end of the supporting keel is fixedly connected to the steel beam, and the outer side of the supporting keel does not exceed the outer side of the top plate; the bottom sealing plate is arranged in the gap between the bottom of the steel beam and the strip board outer wall; an interior decoration layer is arranged on the inner side of the steel beam, the bottom surface of the bottom sealing plate and the inner side of the strip board outer wall; the side sealing plate is arranged between the top plate and the strip board outer wall, and the side sealing plate 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 board outer wall; The horizontal tie rod is arranged between the side sealing plate and the steel beam, the inner end of the horizontal tie rod is fixedly connected to the outer side surface of the steel beam, and the outer end of the horizontal tie rod is inserted into the side sealing plate; the filling layer is filled in the cavity surrounded by the bottom sealing plate, the side sealing plate, the top plate and the steel beam, and an isolation layer is arranged between the outer side surface of the filling layer and the side sealing plate; The outer curtain wall is attached to the outer side of the side sealing plate and connected to the supporting keel through fixing parts.

[0006] Preferably, the cross-section of the steel beam is I-shaped, and shear bolts are arranged at intervals on the top of the steel beam; the shear bolts extend into the top plate steel bars in the top plate and are cast in the concrete of the top plate.

[0007] Preferably, stiffening plates are arranged between the upper flange and the lower flange of the steel beam and on both sides of the web at longitudinal intervals; the diagonal braces are arranged corresponding to the stiffening plates, and the lower part of the diagonal braces is fixedly connected to the stiffening plate on the corresponding side.

[0008] Preferably, the supporting keel includes a supporting frame and a longitudinal brace; the supporting frame has a group and is arranged at intervals along the longitudinal direction; the supporting frame includes an upper cross bar, a lower cross bar and a vertical bar; one end of the lower cross bar is fixedly connected to the steel beam, and the other end of the lower cross bar is connected to the top of the slat outer wall; the vertical bar is connected to the outer end of the lower cross bar; the upper cross bar is connected to the inner side of the top of the vertical bar, and the upper cross bar is connected to the top plate by an expansion bolt; the longitudinal brace is connected between the lower cross bars of adjacent support frames, close to the outer end of the lower cross bar.

[0009] Preferably, vertical plate strips are arranged in the filling layer at longitudinal intervals near the outer side surface of the steel structure; the upper end of the vertical plate strip is connected to the top of the supporting keel, and the lower end of the vertical plate strip is connected to the bottom of the supporting keel.

[0010] Preferably, a pressure plate is provided at the top outer corner of the strip board exterior wall; the pressure plate is strip-shaped, and the cross-section of the pressure plate is L-shaped; the bottom outer side of the supporting keel is connected to the pressure plate; holes are provided on the outer surface of the strip board exterior wall and at longitudinal intervals at the bottom of the pressure plate; hook bolts are provided in the holes; the outer end hook of the hook bolt is welded to the lower part of the outer side surface of the pressure plate.

[0011] Preferably, the side sealing plate is made of GRC plate, and the thickness of the side sealing plate is not less than 10 mm.

[0012] A construction method for a steel structure and an outer curtain wall interlayer connection system comprises the following steps: Step 1: Construction of steel structure: When constructing the strip board exterior wall, leave a gap between the top of the strip board exterior wall and the bottom of the top plate. Step 2: construct a supporting keel on the outside of the steel beam. The supporting keel is set between the strip board outer wall and the top plate, and the inner end of the supporting keel is fixedly connected to the steel beam.

[0013] Step 3: Horizontal tie rods are welded at intervals on the outer surface of the steel beam, facing the outdoors.

[0014] Step 4: Construct the bottom cover to seal the gap between the strip board exterior wall and the steel beam.

[0015] Step 5: Construct the filling layer: construct the filling layer in the cavity surrounded by the bottom cover plate, top plate and steel beam.

[0016] Step 6: After the filling layer is completed, the isolation layer and side sealing plates are installed on the outer side of the filling layer from the inside to the outside, and finally the side sealing plates are firmly fixed to the steel beams with horizontal pull rods.

[0017] Step 7: An interior decoration layer is provided on the inner side surface of the steel beam, the bottom surface of the bottom cover plate and the inner side surface of the strip board outer wall.

[0018] Step 8: Construct the exterior curtain wall. This completes the construction.

[0019] Preferably, the bottom sealing plate is formed by connecting plate units, two adjacent plate units are overlapped and connected, and the overlap length is not less than 100 mm.

[0020] Preferably, the specific method of constructing the supporting keel on the outer side of the steel beam in step 2 is as follows: Step 1, welding a lower cross bar at the lower part of the outer side surface of the steel beam, the lower cross bar is placed horizontally, and the inner end of the lower cross bar is fully welded to the steel beam; Step 2, welding a full-length vertical rod to the outer end of the lower crossbar; Step 3, weld the upper cross bar to the inner side of the top of the vertical bar, and connect the upper cross bar to the top plate through expansion bolts.

[0021] Compared with the prior art, the present invention has the following characteristics and beneficial effects.

[0022] 1. The interlayer processing node between the slatted outer wall and the outer curtain wall of the present invention is fixed by connecting the supporting keel with a steel beam, and a side sealing plate is arranged above the slatted outer wall for waterproofing. In order to ensure that the insulation is firmly fixed, a horizontal pull rod is arranged on the steel beam and fixed with a dovetail screw nut. This method effectively solves the installation of the outer wall slatted wall when there is an external cantilever plate in the steel structure. Whether the outer wall decoration is a curtain wall or a thermal insulation coating, it can be processed in this way. This method ensures the installation of the outer wall slats, the pressing plate can effectively fix the outer wall slats, the double waterproof layer of the side sealing plate and the isolation layer can effectively ensure the water seepage of the outer wall, and the method of the steel beam gap can effectively ensure the insulation method here, and ensure that the insulation does not fall off. The technical system of the present invention systematically solves the key technical problems such as cold bridges, leakage, and deformation control between the steel structure and the outer curtain wall in high-rise steel structure buildings through innovative structural design, material combination and construction technology, and provides a brand-new solution for the curtain wall engineering of super high-rise buildings, with significant technical advancement and engineering promotion value.

[0023] 2. The present invention forms a continuous closed space between the strip board outer wall and the top plate through the combined structure of supporting keel + filling layer + double-layer sealing plate: the supporting keel establishes a structural transition, the filling layer blocks the heat conduction path, and the bottom sealing plate and the side sealing plate form a physical isolation layer, which completely eliminates the cold bridge phenomenon in the traditional structure. At the same time, the invention has an original "external curtain wall-isolation layer-side sealing plate-filling layer" four-level waterproof system: the GRC side sealing plate has both structural strength and waterproof performance, the isolation layer is made of galvanized iron sheet, and the compactness of the filling layer forms a gradient waterproof barrier, which eliminates the risk of leakage and achieves the dual elimination of cold bridges and leakage.

[0024] 3. The diagonal braces of the present invention work in coordination with the stiffening plates. The diagonal braces are arranged according to the spacing of the stiffening plates to form an effective force transmission path, which effectively transfers the cantilever load to the web of the steel beam, and effectively improves the bearing capacity of the cantilever structure. In addition, the three-dimensional keel support system adopts a stable structure of upper / lower horizontal bars + vertical bars, and the longitudinal braces realize the linkage of multiple frames, so that the curtain wall system has a strong wind pressure resistance performance; at the same time, the present invention pre-embeds stainless steel hook bolts in the slat outer wall, and sets a pressure plate at the outer corner of the top of the slat outer wall. The hook bolts and the pressure plate form a mechanical connection, and the support keel is welded to the pressure plate. A more complete support system is formed to transfer the load from the slat outer wall to the support keel, and then to the steel beam, thereby enhancing the stability of the overall structure and preventing the slat outer wall from being displaced due to wind loads or other lateral forces. As a reinforcing component at the corner, the pressure plate is connected to the support keel to form a continuous support frame to improve the torsion resistance.

[0025] 4. The present invention adopts horizontal tie rods, which can apply pre-tightening force through pre-tensioning technology, effectively control the deformation of the side cover plate, and ensure the flatness of the facade. At the same time, galvanized steel plate vertical strips are set in the filling layer to form a three-dimensional grid with the supporting keel to improve the interlayer shear stiffness. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0027] Figure 1 It is a structural schematic diagram of the steel structure and outer curtain wall interlayer connection system of the present invention.

[0028] Figure 2 It is a schematic diagram of the structure in which the supporting keel is arranged between the top plate and the strip board outer wall in the present invention.

[0029] Figure 3 It is a structural schematic diagram of the support frame in the present invention.

[0030] Figure 4 It is a schematic diagram of the connection structure between the steel beam and the diagonal brace in the present invention.

[0031] Figure 5 It is a structural schematic diagram of the shear bolts on the top of the steel beam extending into the floor slab in the present invention.

[0032] Figure numerals: 1-steel beam, 2-top plate, 3-slatted exterior wall, 4-diagonal brace, 5-support keel, 5.1-support frame, 5.1.1-upper cross bar, 5.1.2-lower cross bar, 5.1.3-vertical bar, 5.2-longitudinal brace, 6-filling layer, 7-bottom sealing plate, 8-side sealing plate, 9-horizontal pull rod, 10-interior decoration layer, 11-fixing parts, 12-shear bolts, 13-stiffening plate, 14-expansion bolts, 15-vertical plate strip, 16-isolation layer, 17-glass window, 18-horizontal support, 19-composite thermal insulation rock wool, 20-exterior decorative panel, 21-longitudinal connecting rod, 22-pressure plate, 23-hook bolt. DETAILED DESCRIPTION

[0033] like Figure 1-5 As shown, this steel structure and outer curtain wall interlayer connection system includes a steel structure and an outer curtain wall; the steel structure includes 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 spacing with the edge of the top plate 2; a steel column is supported at the bottom of the steel beam 1; the outer curtain wall is arranged on the outside of the steel structure; it is characterized in that: a strip board outer wall 3 is arranged on the ground along the edge of the top plate 2, and a spacing is left between the top of the strip board outer wall 3 and the bottom surface of the top plate 2; the spacing between the strip board outer wall 3 and the bottom surface of the top plate 2 is adapted to the height of the steel beam 1; the spacing between the strip board outer wall 3 and the top plate 2 is 200mm~300mm; a glass window 17 can also be arranged on the strip board outer wall 3; A diagonal brace 4 is provided between the steel beam 1 and the top plate 2; there is a group 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, close to 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; The steel structure and the outer 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 arranged between the top plate 2 and the strip board outer 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 exceed the outer side of the top plate 2; the bottom sealing plate 7 is arranged in the gap between the bottom of the steel beam 1 and the strip board outer wall 3; an interior decoration layer 10 is arranged 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 board outer wall 3; the side sealing plate 8 is arranged between the top plate 2 and the strip board outer 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 board outer wall 3; The horizontal tie rod 9 is stretched 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 surface of the steel beam 1, and the outer end of the horizontal tie rod 9 is penetrated in the side sealing plate 8; a thread is arranged on the outer end of the horizontal tie rod 9, and it is fastened to the side sealing plate 8 by a nut; a through hole is arranged on the side sealing plate 8 at a position corresponding to the horizontal tie rod 9, through which the horizontal tie rod 9 passes; the filling layer 6 is filled in the cavity surrounded by the bottom sealing plate 7, the side sealing plate 8, the top plate 2 and the steel beam 1, and an isolation layer 16 is arranged between the outer side surface 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, the strip board outer wall 3 and the top plate 2, and is connected to the supporting keel 5, the strip board outer wall 3 and the top plate 2 through the fixing piece 11; the outer curtain wall includes a composite thermal insulation rock wool 19 and an exterior decorative panel 20; the fixing piece 11 is a rivet or anchor bolt. In this embodiment, the cross section of the steel beam 1 is I-shaped, and shear bolts 12 are arranged at intervals on the top of the steel beam 1; the shear bolts 12 extend into the top plate steel bars in the top plate 2 and are cast in the concrete of the top plate 2.

[0034] In this embodiment, stiffening plates 13 are longitudinally spaced between the upper flange and the lower flange of the steel beam 1 and on both sides of the web; the diagonal brace 4 is arranged corresponding to 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.

[0035] In this embodiment, the supporting keel 5 includes a supporting frame 5.1 and a longitudinal brace 5.2; there is a group of supporting frames 5.1, which are arranged at intervals along the longitudinal direction; the supporting frame 5.1 includes an upper cross bar 5.1.1, a lower cross bar 5.1.2 and a vertical bar 5.1.3; one end of the lower cross bar 5.1.2 is fixedly connected to the steel beam 1, and the other end of the lower cross bar 5.1.2 is connected to the top of the slatted outer wall 3; the vertical bar 5.1.3 is connected to the outer end of the lower cross bar 5.1.2; the upper cross bar 5.1.1 is connected to the inner side of the top of the vertical bar 5.1.3, and the upper cross bar 5.1.1 is connected to the top plate 2 through the expansion bolt 14; the longitudinal brace 5.2 is connected between the lower cross bars 5.1.2 of adjacent supporting frames 5.1, close to the outer end of the lower cross bar 5.1.2.

[0036] In this embodiment, vertical plate strips 15 are arranged at longitudinal intervals inside the filling layer 6 and near the outer side surface of the steel structure; the upper end of the vertical plate strip 15 is connected to the top of the supporting keel 5, and the lower end of the vertical plate strip 15 is connected to the bottom of the supporting keel 5; specifically, the upper and lower ends of the vertical plate strip 15 are respectively provided with folded edges, and the upper folded edge of the vertical plate strip 15 is connected to the upper cross bar 5.1.1 by screws, and the lower folded edge of the vertical plate strip 15 is connected to the longitudinal support 5.2 by screws.

[0037] In this embodiment, a pressure plate 22 is provided at the top outer corner of the strip board exterior wall 3; the pressure plate 22 is strip-shaped, and the cross-section of the pressure plate 22 is L-shaped; the pressure plate 22 is made of angle steel, covers the top outer corner of the strip board exterior wall 3, and fixes the upper part of the strip board exterior wall 3; the bottom outer side of the supporting keel 5 is connected to the pressure plate 22, one end of the lower cross bar 5.1.2 is welded to the lower flange plate of the steel beam 1, and the other end of the lower cross bar 5.1.2 is welded to the pressure plate 22; holes are provided on the outer surface of the strip board exterior wall 3 and at intervals along the longitudinal direction at the bottom of the pressure plate 22; hook bolts 23 are provided in the holes; the outer end hook of the hook bolt 23 is welded to the lower part of the outer side surface of the pressure plate 22, and the spacing between adjacent hook bolts 23 is not more than 500mm.

[0038] 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 10 mm.

[0039] The construction method of the steel structure and the outer curtain wall interlayer connection system comprises the following steps.

[0040] Step 1: Construct steel structure: construct the steel columns, steel beams and top plate of the steel structure first, and then fill the wall; when constructing the strip board exterior wall 3, leave a gap between the top of the strip board exterior wall 3 and the bottom of the top plate 2; the steel bars of the top plate 2 are tied on the top surface of the steel beam 1 and connected to the steel beam 1.

[0041] Step 2: construct a supporting keel 5 on the outside of the steel beam 1 , the supporting keel 5 is arranged between the strip board outer wall 3 and the top plate 2 , and the inner end of the supporting keel 5 is fixedly connected to the steel beam 1 .

[0042] Step 3: Horizontal tie rods 9 are welded at intervals on the outer surface of the steel beam 1, facing the outdoors. The horizontal tie rods 9 are made of screw steel bars with a length of 600 mm and a diameter of 10 mm. Screws are processed at the ends of the horizontal tie rods 9. The horizontal tie rods 9 are arranged in a plum blossom shape with a spacing of 500 mm.

[0043] Step 4: construct the bottom sealing plate 7, which is made of 1.5mm thick galvanized iron sheet to close the gap between the strip board outer wall 3 and the steel beam 1. The iron sheet is fixed with nails, and the nail spacing is 300mm.

[0044] Step 5: constructing the filling layer 6: constructing the filling layer 6 in the cavity surrounded by the bottom sealing plate 7, the top plate 2 and the steel beam 1, and the filling layer 6 adopts thermal insulation rock wool.

[0045] Step 6: After the filling layer 6 is filled, the isolation layer 16 and the side sealing plate 8 are installed on the outer side of the filling layer 6 from the inside to the outside. The isolation layer 16 adopts a layer of 1mm galvanized iron sheet. The isolation layer 16 is installed on the outside of a group of vertical rods 5.1.3 and fixed to the vertical rods 5.1.3 by hook bolts; the side sealing plate 8 adopts a layer of 10mmGRC board, and the outer side surface of the side sealing plate 8 is vertically aligned with the outer side surface of the strip board outer wall 3 and the top plate 2. Finally, the dovetail nut is screwed on the outer end of the horizontal pull rod 9 to fix the side sealing plate 8 and the steel beam 1 firmly, and the excess screws are cut off.

[0046] Step 7: An interior decoration layer 10 is provided on the inner side surface of the steel beam 1 , the bottom surface of the bottom sealing plate 7 and the inner side surface of the strip board outer wall 3 .

[0047] Step 8: Construct the exterior curtain wall. This completes the construction.

[0048] In this embodiment, the bottom sealing plate 7 is formed by connecting plate units, and two adjacent plate units are overlapped and connected. The plate units are made of iron sheets, and the overlap length is not less than 100 mm. A longitudinal connecting rod 21 is usually arranged at the bottom of the outer side surface of the steel beam 1. One side of the bottom sealing plate 7 is connected to the inner side surface of the strip board outer wall 3 by screws, and one 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.

[0049] In this embodiment, the specific method of step 2 for constructing the supporting keel 5 on the outer side of the steel beam 1 is as follows: Step 1, welding the lower cross bar 5.1.2 at the lower part of the outer side of the steel beam 1, the lower cross bar 5.1.2 uses 10# channel steel, the spacing is 600mm, it is placed horizontally, and the inner end of the lower cross bar 5.1.2 is fully welded to the steel beam 1; Step 2, welding a full-length vertical rod 5.1.3 to the outer end of the lower crossbar 5.1.2, the vertical rod 5.1.3 being made of angle steel; Step 3, welding the upper cross bar 5.1.1 on the inner side of the top of the vertical bar 5.1.3, and connecting the upper cross bar 5.1.1 to the top plate 2 through expansion bolts 14. The upper cross bar 5.1.1 is made of angle steel.

[0050] The above embodiments are not exhaustive of specific implementation methods, and there may be other embodiments. The above embodiments are intended to illustrate the present invention rather than to limit the protection scope of the present invention. All applications derived from simple variations of the present invention fall within the protection scope of the present invention.

Claims

1. A steel structure and an outer curtain wall interlayer connection system, comprising a steel structure and an outer curtain wall; the steel structure comprises a steel beam (1) and a top plate (2); the steel beam (1) is arranged at the bottom of the top plate (2) and a distance is left between the steel beam (1) and the edge of the top plate (2); the outer curtain wall is arranged on the outside of the steel structure; characterized in that: A strip board exterior wall (3) is arranged on the ground along the edge of the top plate (2), and a gap is left between the top of the strip board exterior wall (3) and the bottom surface of the top plate (2); A diagonal brace (4) is provided between the steel beam (1) and the top plate (2); the diagonal brace (4) is provided in a group and is 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) and close to the edge of the top plate (2); The steel structure and the outer 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 arranged between the top plate (2) and the strip board outer 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 exceed the outer side surface of the top plate (2); the bottom sealing plate (7) is arranged in the gap between the bottom of the steel beam (1) and the strip board outer wall (3); an interior decoration layer (10) is arranged on the inner side surface of the steel beam (1), the bottom surface of the bottom sealing plate (7) and the inner side surface of the strip board outer wall (3); the side sealing plate (8) is arranged between the top plate (2) and the strip board outer wall (3), and the side sealing plate (8) is attached to the outer side surface of the supporting keel (5); the outer side surface of the side sealing plate (8) is vertically flush with the outer side surface of the strip board outer wall (3); The horizontal tie rod (9) is stretched 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 surface of the steel beam (1), and the outer end of the horizontal tie rod (9) is inserted into the side sealing plate (8); the filling layer (6) is filled in the cavity surrounded by the bottom sealing plate (7), the side sealing plate (8), the top plate (2) and the steel beam (1), and an isolation layer (16) is provided between the outer side surface of the filling layer (6) and the side sealing plate (8); The outer curtain wall is attached to the outer side of the side sealing plate (8) and is connected to the supporting keel (5) via a fixing piece (11).

2. The steel structure and exterior curtain wall interlayer connection system according to claim 1 is characterized by: The cross section of the steel beam (1) is in an I-shape, and shear bolts (12) are arranged at intervals on the top of the steel beam (1); the shear bolts (12) extend into the top plate steel bars in the top plate (2) and are cast in the concrete of the top plate (2).

3. The steel structure and exterior curtain wall interlayer connection system according to claim 2 is characterized by: Stiffening plates (13) are arranged between the upper flange and the lower flange of the steel beam (1) and on both sides of the web at intervals in the longitudinal direction; the diagonal brace (4) and the stiffening plates (13) are arranged correspondingly, 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 exterior curtain wall interlayer connection system according to claim 1, characterized in that: The supporting keel (5) comprises a supporting frame (5.1) and a longitudinal brace (5.2); the supporting frame (5.1) has a group and is arranged at intervals in the longitudinal direction; the supporting frame (5.1) comprises an upper cross bar (5.1.1), a lower cross bar (5.1.2) and a vertical bar (5.1.3); one end of the lower cross bar (5.1.2) is fixedly connected to the steel beam (1), and the other end of the lower cross bar (5.1.2) is connected to the top of the strip board outer wall (3). The vertical rod (5.1.3) is connected to the outer end of the lower cross rod (5.1.2); the upper cross rod (5.1.1) is connected to the inner side of the top of the vertical rod (5.1.3), and the upper cross rod (5.1.1) is connected to the top plate (2) through expansion bolts (14); the longitudinal brace (5.2) is connected between the lower cross rods (5.1.2) of adjacent support frames (5.1) and close to the outer end of the lower cross rod (5.1.2).

5. The steel structure and exterior curtain wall interlayer connection system according to claim 1, characterized in that: Vertical plate strips (15) are arranged at intervals along the longitudinal direction in the filling layer (6) and near the outer side surface of the steel structure; the upper ends of the vertical plate strips (15) are connected to the top of the supporting keel (5), and the lower ends of the vertical plate strips (15) are connected to the bottom of the supporting keel (5).

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

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

8. A construction method for the steel structure and outer curtain wall interlayer connection system according to any one of claims 1 to 7, characterized in that: The steps include: Step 1: constructing the steel structure: when constructing the strip board exterior wall (3), a gap is left between the top of the strip board exterior wall (3) and the bottom surface of the top plate (2); Step 2: constructing a support keel (5) on the outside of the steel beam (1), wherein the support keel (5) is supported between the strip board outer wall (3) and the top plate (2), and the inner end of the support keel (5) is fixedly connected to the steel beam (1); Step 3: Horizontal tie rods (9) are welded at intervals on the outer surface of the steel beam (1) facing the outside. Step 4: constructing a bottom sealing plate (7) to close the gap between the strip board outer wall (3) and the steel beam (1); Step 5: constructing a filling layer (6): constructing a filling layer (6) in the cavity enclosed 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 sequentially placed from the inside to the outside on the outer side of the filling layer (6), and finally the side sealing plate (8) and the steel beam (1) are firmly fixed by using a horizontal tie rod (9); Step 7: An interior decoration layer (10) is provided on the inner side surface of the steel beam (1), the bottom surface of the bottom sealing plate (7) and the inner side surface of the strip board outer wall (3); Step 8: Construct the exterior curtain wall. This completes the construction.

9. The construction method of the steel structure and outer curtain wall interlayer connection system according to claim 8 is characterized in that: The bottom sealing plate (7) is formed by connecting plate units, and two adjacent plate units are overlapped and connected, and the overlap length is not less than 100 mm.

10. The construction method of the steel structure and outer curtain wall interlayer connection system according to claim 8, characterized in that: Step 2: The specific method of constructing the supporting keel (5) on the outer side of the steel beam (1) is as follows: Step 1, welding a lower cross bar (5.1.2) to the lower part of the outer side surface of the steel beam (1), the lower cross bar (5.1.2) is placed horizontally, and the inner end of the lower cross bar (5.1.2) is fully welded to the steel beam (1); Step 2, welding a full-length vertical rod (5.1.3) to the outer end of the lower crossbar (5.1.2); Step 3, weld the upper cross bar (5.1.1) to the inner side of the top of the vertical bar (5.1.3), and connect the upper cross bar (5.1.1) to the top plate (2) through expansion bolts (14).

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