CN111622403A - A cold-formed thin-walled steel composite floor and its modularized prefabricated assembly method - Google Patents

Abstract

The invention discloses a cold-formed thin-walled steel composite floor and a modular prefabricated assembly method thereof. The composite floor comprises a cold-formed thin-walled steel skeleton, an autoclaved aerated concrete slab, a steel mesh, a lightweight concrete and a veneer. The cold-formed thin-walled steel skeleton is grid-like, and the autoclaved aerated concrete slab is embedded in the grid of the cold-formed thin-walled steel skeleton, and is fixedly connected with the cold-formed thin-walled steel skeleton; Above the concrete slab, it is cast in place with the lightweight concrete as a whole; the veneer layer is arranged on the upper surface of the lightweight concrete and is fixedly connected with the cold-formed thin-walled steel skeleton. The composite floor has the excellent performance of clear and reasonable force transmission, can meet the requirements of large span, easy to divide the space flexibly, and adapt to the requirements of the residential market. The assembling method of the invention has the advantages of simple procedure, high speed and good integrity, is conducive to realizing building energy saving, and is convenient for industrialized production and modular construction of cold-formed thin-walled steel structure, a green building.

Description

A cold-formed thin-walled steel composite floor and its modularized prefabricated assembly method

technical field

The invention relates to a multi-layer cold-formed thin-walled steel residential structure, in particular to a cold-formed thin-walled steel composite floor and a modular prefabricated assembly method thereof.

Background technique

For many years, cold-formed steel structures have been widely used in low-rise residential and small industrial buildings abroad due to their advantages of light weight, easy forming, environmental protection and recyclability, and are expanding to multi-storey buildings. my country has introduced a large number of low-rise cold-formed steel structure housing technologies from abroad. Up to now, cold-formed steel structures are mainly used in buildings below three floors. Due to the large population, the shortage of land resources and the serious earthquake disaster, the development of cold-formed thin-walled steel structure housing from low-rise to multi-storey is more in line with my country's national conditions. In addition, the existing prefabricated assembly technology of cold-formed thin-walled section steel houses is limited to section steel skeletons, and a large number of manual installations of panels and pipelines are still required at the construction site. structural measures. Therefore, it is cold and cold to study the modular full prefabricated assembly technology, through the factory (standardized, large-scale) production of building components, as well as on-site assembly and construction, so that the production process of buildings can be as industrialized as the assembly of automobiles and furniture. The premise of the promotion and application of green building in my country is the curved thin-walled steel structure, and it is also an effective way to speed up the industrialization and prefabrication of housing.

In the current cold-formed thin-walled steel structure system, the commonly used floors at home and abroad mainly include light steel wood floor, profiled steel plate composite floor and cast-in-place concrete composite floor. Light steel and wood floors have light weight and fast construction speed, but are only suitable for small spans, and such floors have shortcomings such as low stiffness and poor anti-vibration effect. The profiled steel plate composite floor is mostly used in multi- and high-rise buildings because of its high cost. The cast-in-place concrete composite floor has the advantages of high rigidity, anti-impact, good anti-vibration effect, and good economy, but it is self-heavy, slow in installation, and requires high construction conditions. The autoclaved light-weight aerated concrete (ALC) floor used in Japan can greatly reduce the self-weight of the structure, and at the same time has a good use function, but the thickness of this floor is relatively large, and it is mainly used for low-rise steel structure houses.

SUMMARY OF THE INVENTION

Purpose of the invention: One purpose of the present invention is to provide a new type of cold-formed thin-walled steel composite floor with clear and reasonable force transmission.

Another object of the present invention is to provide a modular prefabrication assembly method of the composite floor.

Technical scheme: the cold-formed thin-walled steel composite floor of the present invention, the composite floor comprises a cold-formed thin-walled steel skeleton, an autoclaved aerated concrete slab, a steel mesh, a lightweight concrete and a facing layer, and the cold-formed thin-walled steel The skeleton is grid-like, and the autoclaved aerated concrete slab is embedded in the grid of the cold-formed thin-walled steel skeleton, and is fixedly connected with the cold-formed thin-walled steel skeleton; The lightweight concrete is cast in place as a whole; the veneer layer is arranged on the upper surface of the lightweight concrete and is fixedly connected with the cold-formed thin-walled steel skeleton.

Preferably, the cold-formed thin-walled steel skeleton includes cold-formed thin-walled C-shaped side beams, I-shaped rib beams, right-angle stiffeners, steel ties and connecting beams, and the I-shaped rib beams include longitudinal I-shaped ribs arranged in a crisscross pattern. Beams and transverse I-shaped rib beams, and both ends of the longitudinal I-shaped rib beams and transverse I-shaped rib beams are embedded in coupling beams and cold-formed thin-walled C-shaped side beams, respectively. The part is fixedly connected with the coupling beam and the cold-formed thin-walled C-shaped side beam respectively through right-angle stiffeners; The lower flange of the side beam and the longitudinal I-shaped rib beam is fixedly connected as a whole.

Preferably, both the longitudinal I-shaped rib beam and the transverse I-shaped rib beam include two cold-formed thin-walled C-shaped steel beams and profiled steel plates, and several pressure-shaped steel beams pass between the webs of the two cold-formed thin-walled C-shaped steel beams. Steel plate back-to-back fixed setup.

Preferably, the cold-formed thin-walled C-shaped steel beam of the transverse I-shaped rib beam is provided with through holes for penetrating the longitudinal I-shaped rib beam to form a crisscross structure, and the longitudinal I-shaped rib beam and the transverse I-shaped rib are provided with through holes. The beam joints are fixed by right-angle stiffeners.

Preferably, the autoclaved aerated concrete slab is located between adjacent I-shaped rib beams, and the autoclaved aerated concrete slab and the lower flange of the I-shaped rib beam are fixedly connected by self-tapping screws.

Preferably, the cavity of the profiled steel plate of the I-shaped rib beam is filled with lightweight concrete.

Preferably, the cold-formed thin-walled C-shaped side beam is a C-shaped steel beam, and a plurality of bolt holes are provided on its web.

Preferably, the coupling beam includes two cold-formed thin-walled C-shaped steel beams, a profiled steel plate, a lightweight concrete filling layer, vertical connecting bolts and horizontal connecting bolts, and the webs of the two cold-formed thin-walled C-shaped steel beams are between the webs. The space is fixed back-to-back by the profiled steel plates, and the cavity formed by the webs of the two cold-formed thin-walled C-shaped steel beams and the profiled steel plates is filled with lightweight concrete; In the lightweight concrete filling layer; the horizontal connecting bolts traverse the web and the profiled steel plate of the cold-formed thin-walled C-shaped steel beam and are pre-buried in the lightweight concrete filling layer.

The assembling method of the cold-formed thin-walled steel composite floor according to the present invention comprises the following steps:

S1. Install the connecting beam of cold-formed thin-walled steel frame, cold-formed thin-walled C-shaped side beam and longitudinal I-shaped rib beam:

According to the longitudinal length of the cold-formed thin-walled steel composite floor, temporarily fix two coupling beams, embed the longitudinal I-shaped rib beams into the cold-formed thin-walled C-shaped steel beams of the coupling beams, and use right-angle stiffeners and self-tapping screws to fasten the longitudinal The end of the shaped rib beam is fixedly connected with the cold-formed thin-walled C-shaped steel beam of one of the coupling beams; after all the longitudinal I-shaped ribbed beams are installed, the end of the cold-formed thin-walled C-shaped side beam is embedded in the end of the connecting beam. Cold-formed thin-walled C-shaped steel beams are fixed and connected by self-tapping screws;

S2. Install autoclaved aerated concrete slabs and transverse I-shaped rib beams:

Remove the coupling beams that are not fixedly connected to the ends of the longitudinal I-shaped rib beams in step S1, and insert the first row of autoclaved aerated concrete slabs into the upper part of the lower flanges of the two adjacent longitudinal I-shaped rib beams, And fixedly connect with the lower flange of the longitudinal I-shaped rib beam through self-tapping screws; pass the first transverse I-shaped rib beam through the longitudinal I-shaped rib beam, and connect the end of the first transverse I-shaped rib beam Embedded in the cold-formed thin-walled C-shaped side beam, and fixedly connected by self-tapping screws;

S3, repeat step S2, install subsequent autoclaved aerated concrete slabs and transverse I-shaped rib beams in turn; install the connecting beam removed in step (2) at the end of the longitudinal I-shaped rib beam, that is, the longitudinal I-shaped rib The end of the beam is embedded in the cold-formed thin-walled C-shaped steel beam of the coupling beam, and fixedly connected by right-angle stiffeners and self-tapping screws; at the same time, the end of the cold-formed thin-walled C-shaped edge beam is embedded in the cold-formed steel beam of the coupling beam. The thin-walled C-shaped steel beam is fixed and connected by self-tapping screws;

S4, install the steel pull strap:

The steel tie is arranged at the lower part of the longitudinal I-shaped rib beam, and the lower flange of the longitudinal I-shaped rib beam is fixedly connected with the steel tie by self-tapping screws;

S5. Install steel mesh, pour lightweight concrete and lay veneer:

The steel mesh is fully spread on the upper part of the autoclaved aerated concrete slab, and lightweight concrete is poured into the cavity of the upper part of the autoclaved aerated concrete slab, the longitudinal I-shaped rib beam, the horizontal I-shaped rib beam and the coupling beam to form a steel floor. ; Lay the veneer.

The modular prefabrication assembly method of the cold-formed thin-walled section steel composite floor of the present invention is as follows: firstly, according to the above steps S1 to S5, the cold-formed thin-walled section steel composite floor is pre-fabricated in batches in the factory, wherein in the steps S2 to S5 In S3, the autoclaved aerated concrete slab is not arranged between the cold-formed thin-walled C-shaped edge beam and the adjacent longitudinal I-shaped rib beam to reserve the post-assembly position between the adjacent floors; The curved thin-walled steel composite floor is installed above the lower wall, and the lower part of the vertical connecting bolt in the coupling beam is passed through the top guide rail of the lower wall and fixedly connected; the cold-formed thin-walled steel composite floor is carried out on the same floor. When arranging, arrange the post-assembly position of the cold-formed thin-walled steel composite floor on the side of the connecting beam of the adjacent floor, and insert the cold-formed thin-walled C-shaped edge beam at the post-assembly position into the cold-formed thin-walled C-shaped edge beam of the adjacent floor coupling beam. Bend the thin-walled C-shaped steel beam, and pass the horizontal connecting bolts through the reserved holes of the cold-formed thin-walled C-shaped side beam web and tighten it to complete the fixed connection between adjacent floors; in the cold-formed thin-walled C-shaped beam The post-assembly positions reserved between the side beams and the adjacent longitudinal I-shaped rib beams shall be laid in sequence with autoclaved aerated concrete slabs and steel meshes, and light weight concrete shall be poured, and the surface layer shall be laid to complete the installation of the entire floor; The upper part of the bolt passes through the top rail of the upper wall and is fixedly connected, and the installation on the upper floor is continued.

Beneficial effects: Compared with the prior art, the composite floor of the present invention has the excellent performance of energy saving and environmental protection, clear and reasonable force transmission, which is conducive to realizing building energy saving, and is convenient for industrial production and modular construction. The cold-formed thin-walled steel composite floor of the invention can be prefabricated in a factory, and only the assembly work between the composite floor and the wall is performed on site, the process is simple, and the construction speed is fast. The I-shaped rib beam composed of cold-formed thin-walled C-shaped steel beam and profiled steel plate has the advantages of good bending resistance, rigidity and stability. The well-shaped light steel frame composed of the I-shaped rib beam bears the main load of the floor. , The autoclaved aerated concrete slab can be used as a permanent formwork, which reduces the self-weight of the floor slab, reduces the thickness of the floor slab, and increases the indoor clear height, which is beneficial to the floor slab of the large-bay house to meet the specification requirements; at the same time, the autoclaved aerated concrete slab improves the The rigidity of the composite floor is improved, and the bottom of the floor is flat and smooth, which is easy to decorate and does not need a suspended ceiling, so that the new cold-formed thin-walled steel composite floor can be suitable for multi-storey cold-formed thin-walled steel structure residences. In addition, the vertical connecting bolts and horizontal connecting bolts of the coupling beams respectively connect the upper and lower floors and the adjacent composite floors into a whole, and the steel mesh and the light-weight concrete cast-in-place layer can effectively avoid floor cracking, leakage, etc. question. Therefore, the cold-formed thin-walled steel composite floor of the present invention can effectively ensure the integrity and durability of the modular cold-formed thin-walled steel house structure, and can be suitable for modular multi-storey cold-formed thin-walled steel structure houses.

Description of drawings

Fig. 1 is the structural representation of the novel cold-formed thin-walled section steel composite floor of the present invention;

Fig. 2 is the structural sectional view of the composite floor of the present invention;

Fig. 3 is the structural diagram of the light steel frame in the composite floor of the present invention;

4 is a structural diagram of a cold-formed thin-walled C-shaped steel edge beam in the present invention;

Fig. 5 is the structural diagram of the I-shaped rib beam in the present invention;

Fig. 6 is the connection schematic diagram of longitudinal and transverse I-shaped rib beams in the present invention;

7 is a schematic diagram of the reinforcement connection between a transverse I-shaped rib beam and a cold-formed thin-walled C-shaped steel edge beam in the present invention;

8 is a structural diagram of a connecting beam in the present invention;

9 is a structural cross-sectional view of the connection between the composite floor of the present invention and the adjacent composite floor;

Figure 10 is a structural cross-sectional view of the composite floor of the present invention connected to the upper and lower floors;

Fig. 11 is the modular assembly schematic diagram of the composite floor of the present invention;

In the picture: cold-formed thin-walled steel frame 1, autoclaved aerated concrete slab 2, steel mesh 3, lightweight concrete 4, facing layer 5, bolt holes 6, cold-formed thin-walled C-shaped edge beam 7, I-shaped rib Beam 8, longitudinal I-shaped rib beam 81, transverse I-shaped rib beam 82, through hole 83, right-angle stiffener 9, steel tension belt 10, self-tapping screw 11, cold-formed thin-walled C-shaped steel beam 12, profiled steel plate 13 , Lightweight concrete filling layer 14, connecting beams 15, vertical connecting bolts 16, horizontal connecting bolts 17, lower wall 18, lower wall top rail 19, upper wall 20, upper wall top rail 21.

Detailed ways

The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

As shown in Figures 1 and 2, the composite floor of the present invention includes a cold-formed thin-walled steel frame 1, an autoclaved aerated concrete slab 2, a steel mesh 3, a lightweight concrete 4 and a facing layer 5. The wall-shaped steel frame 1 is formed into a grid shape by the I-shaped rib beams 8, the autoclaved aerated concrete slab 2 is embedded between the adjacent I-shaped rib beams 8 of the cold-formed thin-walled steel frame 1, and the autoclaved aerated concrete slab 2 and the lower flange of the I-shaped rib beam 8 are fixedly connected by self-tapping screws 11; the reinforcement mesh 3 is located above the autoclaved aerated concrete slab 2, and is cast-in-place with the lightweight concrete 4; Above the cast-in-place layer of high quality concrete, and connected to the upper flange of the I-shaped rib beam 8 through self-tapping screws 11 as a whole.

As shown in FIG. 3 , the cold-formed thin-walled steel skeleton 1 is formed by connecting the cold-formed thin-walled C-shaped side beams 7 , I-shaped rib beams 8 , connecting beams 15 , right-angle stiffeners 9 and steel pull straps 10 through self-tapping screws 11 . , as shown in Figure 4, the cold-formed thin-walled C-shaped side beam 7 is a C-shaped steel beam structure, and its web is provided with reserved bolt holes 6. As shown in FIG. 3 , two cold-formed thin-walled C-shaped side beams 7 are respectively arranged on the longitudinal sides of the cold-formed thin-walled steel frame 1 ; On the side, the end of the cold-formed thin-walled C-shaped side beam 7 is embedded in the C-shaped groove of the connecting beam 15 and fixedly connected by self-tapping screws 11 . As shown in FIG. 5 , the I-shaped rib beam 8 includes two cold-formed thin-walled C-shaped steel beams 12 and profiled steel plates 13 arranged back-to-back. The webs of the two cold-formed thin-walled C-shaped steel beams 12 pass several The profiled steel plate 3 and the self-tapping screw 11 are fixedly connected, and the cavity of the profiled steel plate 13 of the I-shaped rib beam is filled with lightweight concrete 4 . As shown in Figure 6, the I-shaped rib beam 8 is divided into a longitudinal I-shaped rib beam 81 and a transverse I-shaped rib beam 82, and the cold-formed thin-walled C-shaped steel beam 12 of the transverse I-shaped rib beam is provided with a through hole 83, which is used for The longitudinal I-shaped rib beam is penetrated to form a crisscross grid structure, and the connection between the longitudinal I-shaped rib beam and the transverse I-shaped rib beam is fixedly connected by right-angle stiffeners 9 and self-tapping screws 11. As shown in FIG. 7, both ends of the longitudinal I-shaped rib beam 81 and the transverse I-shaped rib beam 82 are respectively embedded in the C-shaped grooves of the connecting beam 15 and the cold-formed thin-walled C-shaped side beam 7, and the longitudinal I-shaped rib beam 81 And the end of the transverse I-shaped rib beam 82 is fixedly connected with the connecting beam 15 and the cold-formed thin-walled C-shaped side beam 7 by right-angle stiffeners 9 and self-tapping screws 11 . The steel tie 10 is located under the cold-formed thin-walled C-shaped side beam 7 and the longitudinal I-shaped rib beam 81, and is connected with the lower flange of the cold-formed thin-walled C-shaped side beam 7 and the longitudinal I-shaped rib beam 81 through self-tapping screws. 11 are connected as a whole.

As shown in Figures 8 to 11, the connecting beam 15 is a tensile structure of the adjacent floor slabs and the upper and lower walls. The structure of the connecting beam 15 is similar to the I-shaped rib beam 8, including two cold-formed thin-walled C-shaped Steel beam 12, profiled steel plate 13, lightweight concrete filling layer 14, vertical connection bolts 16 and horizontal connection bolts 17, the webs of the two cold-formed thin-walled C-shaped steel beams 12 are fixed back to back by the profiled steel plate 13 installed, and the cavity formed by the webs of the two cold-formed thin-walled C-shaped steel beams 12 and the profiled steel plate 13 is filled with lightweight concrete 14; the vertical connecting bolts 16 are vertically arranged on the lightweight concrete of the profiled steel plate 13 In the filling layer 14 ; the horizontal connecting bolts 17 are pre-buried in the lightweight concrete filling layer 14 across the cold-formed thin-walled C-shaped steel beam 12 and the profiled steel plate 13 . After the vertical connecting bolts 16 are fixedly connected to the top guide rails 19 of the lower wall 18, the horizontal connecting bolts 17 pass through the reserved bolt holes in the web of the cold-formed thin-walled C-shaped side beam 7 in the combined floor on one side of the connecting beam 15. 6. Tighten with nuts to connect the adjacent floor slabs into a whole; the upper part of the vertical connecting bolts 16 pass through the top guide rail 21 of the upper wall 20 and tighten with nuts to connect the upper and lower walls into a whole.

The prefabricated assembly method of the cold-formed thin-walled steel composite floor includes the following steps:

S1. Install the connecting beam 15 of the cold-formed thin-walled steel frame 1, the cold-formed thin-walled C-shaped side beam 7 and the longitudinal I-shaped rib beam 81: Temporarily fix the two connecting beams according to the longitudinal length of the cold-formed thin-walled steel composite floor 15. Embed the longitudinal I-shaped rib beam 81 into the cold-formed thin-walled C-shaped steel beam 12 of the coupling beam 15, and use right-angle stiffeners 9 and self-tapping screws 11 to connect the end of the longitudinal I-shaped rib beam 81 with one of the The cold-formed thin-walled C-shaped steel beam 12 of the beam 15 is fixedly connected; after all the longitudinal I-shaped rib beams 81 are installed, the end of the cold-formed thin-walled C-shaped side beam 7 is embedded into the cold-formed thin-walled C-shaped beam of the connecting beam 15. The steel beam 12 is fixedly connected by self-tapping screws 11 .

S2, install the autoclaved aerated concrete slab 2 and the transverse I-shaped rib beam 82: remove the connecting beam 15 that is not fixedly connected to the end of the longitudinal I-shaped rib beam 81 in step S1, and remove the first row of autoclaved aerated beams The concrete slab 2 is embedded in the upper part of the lower flanges of the adjacent two longitudinal I-shaped rib beams 81, and is fixedly connected with the lower flanges of the longitudinal I-shaped rib beams 81 through self-tapping screws 11; The rib beam 82 passes through the longitudinal I-shaped rib beam 81, and the end of the first transverse I-shaped rib beam 82 is embedded in the cold-formed thin-walled C-shaped side beam 7, and is fixedly connected by self-tapping screws 11;

S3, repeat step S2, install the subsequent autoclaved aerated concrete slab 2 and the transverse I-shaped rib beam 82 in turn; install the connecting beam 15 removed in step S2 on the end of the longitudinal I-shaped rib beam 81, about the longitudinal I-shaped rib beam 81 The end of the rib beam 81 is embedded in the cold-formed thin-walled C-shaped steel beam 12 of the connecting beam 15, and is fixedly connected by right-angle stiffeners 9 and self-tapping screws 11; the end of the cold-formed thin-walled C-shaped side beam 7 is connected Embedded in the cold-formed thin-walled C-shaped steel beam 12 of the coupling beam 15 and fixedly connected by self-tapping screws 11;

S4, install the steel pull strap 10: set the steel pull strap 10 on the lower part of the longitudinal I-shaped rib beam 81, and use self-tapping screws 11 to fixedly connect the lower flange of the longitudinal I-shaped rib beam 81 with the steel pull strap 10;

S5, install the steel mesh 3, pour the lightweight concrete 4 and lay the decorative layer 5: the steel mesh 3 is fully laid on the upper part of the autoclaved aerated concrete slab 2, on the upper part of the autoclaved aerated concrete slab 2, the longitudinal I-shaped Lightweight concrete is poured into the cavity of the rib beam 81 , the transverse I-shaped rib beam 82 and the connecting beam 15 to form a steel floor; the finishing layer 5 is laid.

The modular prefabrication assembly method of the cold-formed thin-walled steel composite floor includes the following steps:

First, according to the above steps S1 to S5, the cold-formed thin-walled steel composite floors are pre-cooled in batches in the factory. The autoclaved aerated concrete slab 2 is not arranged in the room to reserve the post-assembly position between the adjacent floors; then, the prefabricated cold-formed thin-walled steel composite floor is installed above the lower wall 18, and the coupling beams are installed. The lower part of the vertical connecting bolt 16 in 15 passes through the top guide rail 19 of the lower wall 18 and is fixedly connected; when the cold-formed thin-walled steel composite floor is arranged on the same floor, the back of the cold-formed thin-walled steel composite floor shall be installed. The assembly position is arranged on the side of the connecting beam 15 of the adjacent floor, and the cold-formed thin-walled C-shaped side beam 7 at the rear assembly position is embedded in the cold-formed thin-walled C-shaped steel beam 12 of the adjacent floor connecting beam 15, and Pass the horizontal connecting bolts 17 through the reserved holes 6 in the web of the cold-formed thin-walled C-shaped side beams 7 and tighten them to complete the fixed connection between the adjacent floors; The post-assembly positions reserved between the I-shaped rib beams 81 are laid in turn by laying the autoclaved aerated concrete slab 2 and the steel mesh 3, pouring lightweight concrete, and laying the surface layer to complete the installation of the entire floor; The upper part passes through the top rail 21 of the upper wall 20 and is fixedly connected, and the installation on the upper floor is continued.

The cold-formed thin-walled steel composite floor of the present invention and the tie beams with the adjacent floor slabs and the upper and lower walls are all prefabricated in the factory, and then assembled by bolting on the construction site, with less post-assembly work and less construction. The speed is greatly improved. The I-shaped rib beam is used as the light steel skeleton of the composite floor, and the autoclaved aerated concrete slab is used as the permanent formwork, which reduces the self-weight of the floor, reduces the thickness of the floor, and greatly improves the layout flexibility of the large-bay residence. In addition, the vertical connecting bolts and the horizontal connecting bolts of the coupling beams respectively connect the upper and lower floors and the adjacent composite floors into a whole, which further improves the overall performance of the composite floors. The use of steel mesh and lightweight concrete cast-in-place layer avoids problems such as floor cracking and leakage. Therefore, the cold-formed thin-walled steel composite floor of the present invention can effectively ensure the integrity and durability of the modular cold-formed thin-walled steel house structure, and can be suitable for modular multi-storey cold-formed thin-walled steel structure houses.

Claims (10)

1. A cold-formed thin-walled steel composite floor is characterized in that: the composite floor comprises a cold-formed thin-walled steel skeleton (1), an autoclaved aerated concrete slab (2), a steel mesh (3), a lightweight The concrete (4) and the veneer layer (5), the cold-formed thin-walled steel skeleton (1) is in the form of a grid, and the autoclaved aerated concrete slab (2) is embedded in the grid of the cold-formed thin-walled steel skeleton (1). and fixedly connected with the cold-formed thin-walled steel frame (1); the reinforcing mesh (3) is arranged above the autoclaved aerated concrete slab (2), and is cast in place with the lightweight concrete (4) as a whole; the finishing layer ( 5) It is arranged on the upper surface of the lightweight concrete (4), and is fixedly connected with the cold-formed thin-walled steel frame (1). 2. The cold-formed thin-walled steel composite floor according to claim 1, wherein the cold-formed thin-walled steel skeleton (1) comprises a cold-formed thin-walled C-shaped edge beam (7), an I-shaped rib beam (8), right-angle stiffeners (9), steel tension belts (10) and connecting beams (15), the I-shaped rib beams (8) include longitudinal I-shaped rib beams (81) and transverse I-shaped rib beams arranged in a crisscross pattern (82), and both ends of the longitudinal I-shaped rib beam (81) and the transverse I-shaped rib beam (82) are embedded in the connecting beam (15) and the cold-formed thin-walled C-shaped side beam (7), respectively. (81) and the ends of the transverse I-shaped rib beam (82) are respectively fixedly connected to the connecting beam (15) and the cold-formed thin-walled C-shaped side beam (7) through right-angle stiffeners (9); It is located below the cold-formed thin-walled C-shaped edge beam (7) and the longitudinal I-shaped rib beam (81), and is connected to the lower flange of the cold-formed thin-walled C-shaped edge beam (7) and the longitudinal I-shaped rib beam (81). Fixed connection as a whole. 3. The cold-formed thin-walled steel composite floor according to claim 2, wherein the longitudinal I-shaped rib beam (81) and the transverse I-shaped rib beam (82) both comprise two cold-formed thin-walled C-shaped steels The beams (12) and the profiled steel plates (13), and the webs of the two cold-formed thin-walled C-shaped steel beams (12) are fixedly arranged back-to-back through a plurality of profiled steel plates (3). 4. The cold-formed thin-walled steel composite floor according to claim 3, wherein the cold-formed thin-walled C-shaped steel beam (12) of the transverse I-shaped rib beam (82) is provided with a through hole (83) is used to penetrate the longitudinal I-shaped rib beam (81) to form a crisscross structure, and the connection between the longitudinal I-shaped rib beam (81) and the transverse I-shaped rib beam (82) is fixed by a right-angle stiffener (9). 5. The cold-formed thin-walled steel composite floor according to claim 2, characterized in that: the autoclaved aerated concrete slab (2) is located between the adjacent I-shaped rib beams (8), and the autoclaved The air-concrete slab (2) and the lower flange of the I-shaped rib beam (8) are fixedly connected by self-tapping screws (11). 6 . The cold-formed thin-walled steel composite floor according to claim 2 , wherein the cavity of the profiled steel plate ( 13 ) of the I-shaped rib beam ( 8 ) is filled with lightweight concrete ( 4 ). 7 . 7. The cold-formed thin-walled steel composite floor according to claim 2, characterized in that: the cold-formed thin-walled C-shaped side beam (7) is a C-shaped steel beam, and several bolt holes are provided on its web. 8. The cold-formed thin-walled steel composite floor according to claim 2, wherein the coupling beam (15) comprises two cold-formed thin-walled C-shaped steel beams (12), a profiled steel plate (13), a light Concrete filling layer (14), vertical connecting bolts (16) and horizontal connecting bolts (17), the webs of two cold-formed thin-walled C-shaped steel beams (12) are fixed back-to-back by profiled steel plates (3). and the cavity formed by the webs of the two cold-formed thin-walled C-shaped steel beams (12) and the profiled steel plates (3) is filled with lightweight concrete (14); the vertical connecting bolts (16) are vertically arranged on the Inside the lightweight concrete filling layer (14) of the profiled steel plate (13); the horizontal connecting bolts (17) traverse the web of the cold-formed thin-walled C-shaped steel beam (12) and the profiled steel plate (13) is pre-buried in the Lightweight concrete fill layer (14). 9. A method of assembling a cold-formed thin-walled section steel composite floor, characterized in that it comprises the following steps: S1. Install the connecting beam (15) of the cold-formed thin-walled steel frame (1), the cold-formed thin-walled C-shaped side beam (7) and the longitudinal I-shaped rib beam (81): Temporarily fix two coupling beams (15) according to the longitudinal length of the cold-formed thin-walled steel composite floor, and embed the longitudinal I-shaped rib beam (81) into the cold-formed thin-walled C-shaped steel beam (12) of the coupling beam (15). , use right-angle stiffeners (9) and self-tapping screws (11) to fix the end of the longitudinal I-shaped rib beam (81) with the cold-formed thin-walled C-shaped steel beam (12) of one of the connecting beams (15) ; After installing all the longitudinal I-shaped rib beams (81), insert the end of the cold-formed thin-walled C-shaped side beam (7) into the cold-formed thin-walled C-shaped steel beam (12) of the connecting beam (15) and pass through the Self-tapping screws (11) are fixedly connected; S2. Install the autoclaved aerated concrete slab (2) and the transverse I-shaped rib beam (82): The connecting beams (15) that are not fixedly connected to the ends of the longitudinal I-shaped rib beams (81) in step S1 are removed, and the first row of autoclaved aerated concrete slabs (2) are embedded in two adjacent longitudinal I-shaped beams. The upper part of the lower flange of the rib beam (81) is fixedly connected with the lower flange of the longitudinal I-shaped rib beam (81) through self-tapping screws (11); Pass through the longitudinal I-shaped rib beam (81), and embed the end of the first transverse I-shaped rib beam (82) into the cold-formed thin-walled C-shaped side beam (7), and fix it with self-tapping screws (11). connect; S3. Step S2 is repeated, and subsequent autoclaved aerated concrete slabs (2) and transverse I-shaped rib beams (82) are installed in sequence; the coupling beams (15) removed in step S2 are installed on the longitudinal I-shaped rib beams (81). ), that is, the end of the longitudinal I-shaped rib beam (81) is embedded in the cold-formed thin-walled C-shaped steel beam (12) of the coupling beam (15), and the right-angle stiffener (9) and the self-tapping screw ( 11) Fixed connection; the end of the cold-formed thin-walled C-shaped side beam (7) is embedded in the cold-formed thin-walled C-shaped steel beam (12) of the connecting beam (15) and fixedly connected by self-tapping screws (11); S4. Install the steel pull strap (10): The steel pull strap (10) is arranged at the lower part of the longitudinal I-shaped rib beam (81), and the lower flange of the longitudinal I-shaped rib beam (81) is fixedly connected to the steel pull strap (10) by using self-tapping screws (11). ; S5. Install the steel mesh (3), pour the lightweight concrete (4) and lay the finishing layer (5): The steel mesh (3) is fully laid on the upper part of the autoclaved aerated concrete slab (2), on the upper part of the autoclaved aerated concrete slab (2), the longitudinal I-shaped rib beams (81) and the horizontal I-shaped rib beams (82) ) and the cavity of the connecting beam (15) are poured with lightweight concrete to form a steel floor; and a finishing layer (5) is laid. 10. A modular prefabrication assembly method for cold-formed thin-walled steel composite floors, characterized in that the method is: firstly, according to the steps S1 to S5 described in claim 9, pre-cooling the thin-walled thin-walled steel composites in batches in a factory Floor cover, wherein in steps S2 to S3, no autoclaved aerated concrete slabs (2) are arranged between the cold-formed thin-walled C-shaped side beams (7) and the adjacent longitudinal I-shaped rib beams (81) to reserve The post-assembly position between adjacent floors; then, install the prefabricated cold-formed thin-walled steel composite floor above the lower wall (18), and connect the vertical connecting bolts (16) in the connecting beams (15). ) passes through the top guide rail (19) of the lower wall (18) and is fixedly connected; when the cold-formed thin-walled steel composite floor is arranged on the same floor, the rear assembly position of the cold-formed thin-walled steel composite floor shall be arranged. On the side of the connecting beam (15) of the adjacent floor, insert the cold-formed thin-walled C-shaped side beam (7) at the rear assembly position into the cold-formed thin-walled C-shaped steel beam (15) of the adjacent floor connecting beam (15). 12), and pass the horizontal connecting bolts (17) through the reserved holes (6) in the web of the cold-formed thin-walled C-shaped side beams (7) and tighten them to complete the fixed connection between the adjacent floors; The post-assembly positions reserved between the thin-walled C-shaped side beams (7) and the adjacent longitudinal I-shaped rib beams (81) are sequentially laid with autoclaved aerated concrete slabs (2) and steel meshes (3), and lightweight concrete is poured , Lay the surface layer to complete the installation of the entire floor; pass the upper part of the vertical connecting bolt (16) through the top guide rail (21) of the upper wall (20) and fix it, and continue the installation on the upper floor.

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