A novel prefabricated composite frame structure and its construction method

Abstract

The present invention relates to a novel prefabricated composite frame structure and its construction method, which includes a composite frame system composed of concrete-filled steel tube T-shaped columns, rectangular composite beams, and precast cup-shaped concrete floor slabs. A single set of the composite frame system includes two relatively placed concrete-filled steel tube T-shaped columns. The tops of the two concrete-filled steel tube T-shaped columns are connected by a rectangular composite beam. Along the length direction of the top end of the rectangular composite beam, a number of precast cup-shaped concrete floor slabs are arranged side by side and closely attached. A steel cover plate is provided on the top of the inner end of the precast cup-shaped concrete floor slab, and the rectangular composite beam, the precast cup-shaped concrete floor slab, and the steel cover plate are connected and fastened by a number of vertically arranged high-strength bolts. T-shaped steel bars with threaded ends are horizontally inserted in the middle of the precast cup-shaped concrete floor slab along the thickness direction, and the concrete floor slabs are connected and fastened by the T-shaped steel bars. A composite frame system is formed by using the concrete-filled steel tube T-shaped columns, the rectangular composite beams, and the precast concrete floor slabs. Each individual component can be bolted together on-site after being processed in the factory, greatly reducing the on-site work difficulty; it has strong assembly and is easy to install, fully demonstrating the building characteristics of convenient installation and environmental friendliness of the prefabricated structure.

Description

Technical Field

[0001] The present invention relates to a new type of prefabricated composite frame structure and a construction method thereof. Background Art

[0002] In the new era, with the development of society and the growth of economy in China, the demographic dividend in China is disappearing. The construction industry is facing problems such as labor shortage and rapid increase in labor costs. At the same time, the current traditional on-site construction methods are also facing increasingly prominent problems such as environmental pollution, water resource waste, and large amount of construction waste. To solve these problems and maintain the sustainable development of the construction industry, in recent years, China has vigorously promoted building industrialization, developed prefabricated buildings, and promoted the development of green and environmental protection buildings. Compared with traditional reinforced concrete structures, brick-concrete structures, and steel structures, composite structures have the advantages of good seismic performance, less building energy consumption, light self-weight, convenient construction, and green environmental protection. However, the structure requires specific shear connectors, special welding equipment, and special welding personnel, and has strict requirements for the on-site construction environment.

[0003] Aiming at the disadvantages of the steel-concrete composite structure, such as complex connection, large on-site workload and difficulty, slow construction; poor integrity of precast concrete floor slabs and poor installation flexibility; brittle failure prone to occur due to weld connection fracture, etc., the present invention forms a new type of prefabricated frame structure system by combining concrete-filled steel tube T-shaped columns, precast cup-shaped concrete floor slabs, and rectangular composite beams, greatly reducing the on-site workload and construction difficulty, and ensuring the integrity of the floor slab force. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the technical problem to be solved by the present invention is to provide a new type of prefabricated composite frame structure and a construction method thereof, which not only has a reasonable structure, but also has the advantages of green environmental protection, simple connection, saving formwork, shortening the construction period, and good bearing capacity.

[0005] To solve the above technical problems, the technical solution of the present invention is: a composite frame system including concrete-filled steel tube T-shaped columns, rectangular composite beams, and precast cup-shaped concrete floor slabs. A single group of composite frame systems includes two relatively placed concrete-filled steel tube T-shaped columns. The tops of the two concrete-filled steel tube T-shaped columns are connected by a rectangular composite beam. Along the length direction of the top of the rectangular composite beam, a number of precast cup-shaped concrete floor slabs are arranged side by side and closely attached. A steel cover plate is provided on the top of the inner end of the precast cup-shaped concrete floor slab, and the rectangular composite beam, the precast cup-shaped concrete floor slab, and the steel cover plate are connected and fixed by a number of vertically arranged high-strength bolts. A T-shaped steel bar with a threaded end is horizontally inserted in the middle of the precast cup-shaped concrete floor slab along the thickness direction, and each concrete floor slab is connected and fixed by the T-shaped steel bar.

[0006] Furthermore, the concrete-filled steel tube T-shaped column comprises a plurality of thin-walled H-shaped steel tubes extending vertically. The thin-walled H-shaped steel tubes are longitudinally arranged side by side and are fixedly connected at both longitudinal ends with thin-walled channel steel tubes to form the ends of the concrete-filled steel tube T-shaped column. Head Steel ear plates are welded to the transverse ends of the concrete-filled steel tube T-shaped column, and connecting sleeves for facilitating connection with the rectangular composite beam through tension bolts are longitudinally inserted into the transverse ends.

[0007] Furthermore, formworks are arranged at the transverse ends of a single channel steel for the rectangular composite beam, and concrete is poured into the channel steel to form the rectangular composite beam. Reserved holes are evenly distributed at intervals along the length direction on the web of the channel steel of the rectangular composite beam, vertical sleeves are inserted into the reserved holes, and the rectangular composite beam is connected with the precast cup-shaped concrete floor slab and the steel cover plate through high-strength bolts passing through the vertical sleeves; a horizontal sleeve for facilitating connection with the concrete-filled steel tube T-shaped column through tension bolts is longitudinally inserted between the two wing plates of the channel steel of the rectangular composite beam.

[0008] Furthermore, there are two groups of the rectangular composite beams, which are symmetrically arranged on both sides of the thin-walled H H-shaped steel tube. A U-shaped steel groove for blocking the two side precast cup-shaped concrete floor slabs is fixedly arranged in the middle of the rectangular composite beam. Concave openings for cooperating with the precast cup-shaped concrete floor slab are recessed inwards at both transverse ends of the U-shaped steel groove, and a steel groove cover plate is arranged at the top end of the U-shaped steel groove.

[0009] Furthermore, threads are provided at both ends of the T-shaped steel bar. After the transverse end of the T-shaped steel bar passes through the precast cup-shaped concrete floor slab, it is fixed tightly with a nut, and the end abuts against the concave opening of the U-shaped steel groove. There are four T-shaped steel bars in a single group of composite frame systems, and every two T-shaped steel bars cooperate with a rectangular composite beam. The two T-shaped steel bars extend towards each other to both sides of the U-shaped steel groove and are tightened with nuts so that all the precast floor slabs and the U-shaped steel groove are stressed together. The short side length of the T-shaped steel bar is greater than the bottom width of the cup-shaped concave part at the end of the precast cup-shaped concrete floor slab, so as to form self-locking in the cup-shaped concave part at the end of the precast cup-shaped concrete floor slab when the nut is installed at the longitudinal end of the T-shaped steel bar to drive the short side to rotate.

[0010] Furthermore, through holes for the T-shaped steel bars to pass through are reserved transversely in the middle of the precast cup-shaped concrete floor slab, and holes for the high-strength bolts to pass through are vertically opened at one end of the precast cup-shaped concrete floor slab close to the rectangular composite beam.

[0011] A construction method for a new type of prefabricated composite frame structure is carried out according to the following steps: S1: First, the concrete-filled steel tube T-shaped columns and rectangular composite beams are welded separately in the prefabrication factory and then transported to the site for hoisting; S2: Fix the two concrete-filled steel tube T-shaped columns, and then hoist the rectangular composite beam from bottom to top to the side of the concrete-filled steel tube T-shaped column, and connect the rectangular composite beam and the left and right concrete-filled steel tube T-shaped columns through horizontal tie bolts; S3: Place the precast cup-shaped concrete floor slab, U-shaped steel groove and steel groove cover plate on the upper part of the composite rectangular beam in sequence. The T-shaped steel bars are inserted into the first precast cup-shaped concrete floor slab on the left side, and then pass through the precast cup-shaped concrete floor slab from left to right along the through holes in sequence to form a precast floor slab on one side. Similarly, a precast floor slab on the other side is formed from right to left; S4: Since there is a certain construction space in the short side direction of the T-shaped steel bars, all the T-shaped steel bars are pushed into the through holes; S5: Place the U-shaped steel groove in the middle of the two precast floor slabs to ensure sufficient construction space and pipeline space on both sides of the floor slab, and then clamp out the T-shaped steel bars and tighten them; S6: Cover the steel groove cover plate. The steel cover plate and the precast floor slab are provided with holes at the positions corresponding to the vertical sleeves of the rectangular composite beam in the vertical direction, and the rectangular composite beam, the precast floor slab and the steel cover plate are connected with high-strength bolts, and nuts are screwed on at the lower part; S7: Connect the rectangular composite beam, the precast floor slab and the steel ear plates of the concrete-filled steel tube T-shaped columns with high-strength bolts, and screw on nuts at the lower part to complete the assembly.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] (1) By forming a frame structure with concrete-filled steel tube T-shaped columns, precast cup-shaped concrete floor slabs and rectangular composite beams, compared with traditional composite beams and reinforced concrete structures, it has the advantages of environmental protection, simple connection, saving formwork, shortening the construction period and good bearing capacity. The T-shaped columns use thin-walled steel tubes with two different cross-sections, effectively reducing the number and density of welds, thereby reducing the stress concentration of the structure.

[0014] (2) The composite beam and the T-shaped column are connected by horizontal tie bolts, and the precast floor slab, the composite beam and the steel cover plate are connected by vertical embedded bolts, greatly reducing the on-site workload and construction difficulty.

[0015] (3) The cup shape of the precast concrete floor slab can increase the bite force between the floor slabs. The threaded T-shaped steel bars are inserted into the middle of the floor slab, and one end of the steel bar is tightened with a nut. During the tightening process, the other end of the steel bar will rotate, generating a self-locking effect with the upper floor slab, thus ensuring the integrity of the floor slab force. On the other hand, placing a U-shaped steel groove in the middle of the floor slab can leave enough installation space for the precast floor slab.

[0016] The following further describes the present invention in detail with reference to the drawings and specific embodiments. Description of the Drawings

[0017] Figure 1 Schematic diagram of the structure of an embodiment of the present invention;

[0018] Figure 2 Top view schematic diagram of an embodiment of the present invention;

[0019] Figure 3 is Figure 2 The sectional view taken along D-D in

[0020] Figure 4 is Figure 2 The sectional view taken along E-E in

[0021] Figure 5 Schematic diagram of the connection structure between the concrete-filled steel tube T-shaped column and the rectangular composite beam in an embodiment of the present invention;

[0022] Figure 6 Schematic diagram of the structure of the concrete-filled steel tube T-shaped column in an embodiment of the present invention;

[0023] Figure 7 Schematic diagram of the structure of the rectangular composite beam in an embodiment of the present invention;

[0024] Figure 8 Schematic diagram of the structure of the T-shaped steel bar in an embodiment of the present invention;

[0025] Figure 9 Schematic diagram of the structure of the steel channel in an embodiment of the present invention;

[0026] Figure 10 Schematic diagram of the structure of the steel cover plate in an embodiment of the present invention;

[0027] Figure 11 Schematic diagram of the structure of the steel channel cover plate in an embodiment of the present invention.

[0028] In the figure: A - Concrete-filled steel tube T-shaped column, B - Rectangular composite beam, C - Prefabricated cup-shaped concrete floor slab, 1 - Thin-walled H-shaped steel tube, 2 - Thin-walled channel steel tube, 3 - Steel ear plate, 5 - U-shaped steel channel, 7 - High-strength bolt, 8 - Steel cover plate, 9 - Reserved hole for high-strength bolt, 10 - T-shaped steel bar, 11 - Steel channel cover plate, 12 - Tie bolt, 13 - Connecting sleeve, 14 - Horizontal sleeve, 15 - Reserved hole, 16 - Vertical sleeve, 17 - Notch, 18 - Protrusion, 19 - Recess. Detailed implementation manners

[0029] To make the above features and advantages of the present invention more obvious and understandable, specific embodiments are hereinafter given and described in detail in conjunction with the accompanying drawings as follows.

[0030] Such as Figures 1 - 11As shown in the figure, a new type of prefabricated composite frame structure includes a composite frame system composed of a concrete-filled steel tubular T-shaped column A, a rectangular composite beam B, and a precast cup-shaped concrete floor slab C. A single group of the composite frame system includes two relatively placed concrete-filled steel tubular T-shaped columns. The tops of the two concrete-filled steel tubular T-shaped columns are connected by a rectangular composite beam. Along the length direction of the top end of the rectangular composite beam, a number of precast cup-shaped concrete floor slabs are arranged side by side and closely attached. A steel cover plate 8 is provided on the top of the inner end of the precast cup-shaped concrete floor slab, and a number of vertically arranged high-strength bolts 7 pass through high-strength bolt reserved holes 9 to connect and fasten the rectangular composite beam, the precast cup-shaped concrete floor slab, and the steel cover plate. A T-shaped steel bar 10 with a threaded end is horizontally inserted in the middle of the precast cup-shaped concrete floor slab along the thickness direction, and each concrete floor slab is connected and fastened by the T-shaped steel bar.

[0031] In the embodiment of the present invention, the concrete-filled steel tubular T-shaped column includes a number of thin-walled H-shaped steel pipes 1 extending vertically. The thin-walled H-shaped steel pipes are longitudinally arranged side by side and are fixedly connected at both longitudinal ends with thin-walled channel steel pipes 2 to form the ends of the concrete-filled steel tubular T-shaped column. Head Steel ear plates are welded to the transverse ends of the concrete-filled steel tubular T-shaped column. Connecting sleeves for facilitating connection with the rectangular composite beam through tension bolts are longitudinally inserted on the transverse ends. The steel ear plates are arranged at the top of the transverse ends of the concrete-filled steel tubular T-shaped column. The steel pipes are connected by welds. Using Two steel pipes with different cross-sections can effectively reduce the number and density of welds. Connecting sleeves 13 for facilitating connection with the rectangular composite beam through tension bolts are longitudinally inserted at the tops of the short-side thin-walled H-shaped steel pipes. The connecting sleeves correspond one by one to the horizontal sleeves 14 to facilitate the passing of the tension bolts.

[0032] In the embodiment of the present invention, the rectangular composite beam is formed by setting templates at both transverse ends of a single channel steel and pouring concrete in the channel steel. Along the length direction of the web of the channel steel of the rectangular composite beam, reserved holes 15 are evenly distributed at intervals, and vertical sleeves 16 are inserted into the reserved holes. High-strength bolts pass through the vertical sleeves to connect the rectangular composite beam with the precast cup-shaped concrete floor slab and the steel cover plate. When pouring, concrete is filled while avoiding the vertical sleeves. In order to connect with the precast cup-shaped concrete floor slab and the steel cover plate through high-strength bolts; horizontal sleeves for facilitating connection with the concrete T-shaped column through tension bolts 12 are longitudinally inserted between the two wing plates of the channel steel of the rectangular composite beam. The U-shaped steel channel is connected to the rectangular composite beam through high-strength bolts.

[0033] In the embodiment of the present invention, two groups of the rectangular composite beams are provided and are symmetrically arranged on the thin-walled HOn both sides of the H-shaped steel pipe, a U-shaped steel groove 5 for blocking the precast cup-shaped concrete floor slabs on both sides is fixedly installed in the middle of the rectangular composite beam. Concave openings 17 matching the precast cup-shaped concrete floor slabs are recessed inward at both transverse ends of the U-shaped steel groove. A steel groove cover plate 11 is covered on the top end of the U-shaped steel groove.

[0034] In the embodiment of the present invention, threads are provided at both ends of the T-shaped steel bar. Its transverse end passes through the precast cup-shaped concrete floor slab and is fixed by a nut, and the end abuts against the concave opening of the U-shaped steel groove. Four T-shaped steel bars are provided in a single group of composite frame systems. Every two T-shaped steel bars cooperate with a rectangular composite beam. The two T-shaped steel bars extend towards each other and their transverse ends abut against the two transverse sides of the U-shaped steel groove. After the longitudinal ends of the T-shaped steel bars are screwed with nuts, they are self-locked in the cup-shaped concave part at the end of the precast cup-shaped concrete floor slab. At both transverse ends of each precast cup-shaped concrete floor slab, one end protrudes as a convex part 18, and the other end is a concave part 19 for cooperating with the convex part of another precast cup-shaped concrete floor slab. The concrete floor slab is set in a cup shape to increase the bite force between the floor slabs.

[0035] In the embodiment of the present invention, through holes for the T-shaped steel bars to pass through are reserved transversely in the middle of the precast cup-shaped concrete floor slab. A hole for a high-strength bolt to pass through is vertically opened at one end of the precast cup-shaped concrete floor slab near the rectangular composite beam.

[0036] A construction method for a new type of assembled composite frame structure is carried out according to the following steps: S1: First, the concrete-filled steel tube T-shaped columns and the rectangular composite beams are respectively welded in the prefabrication factory and then transported to the site for hoisting; S2: Fix the two concrete-filled steel tube T-shaped columns, and then hoist the rectangular composite beam from bottom to top to the side of the concrete-filled steel tube T-shaped column, and connect the rectangular composite beam and the left and right concrete-filled steel tube T-shaped columns through horizontal tie bolts; S3: Place the precast cup-shaped concrete floor slabs, the U-shaped steel groove and the steel groove cover plate on the upper part of the composite rectangular beam in sequence. The T-shaped steel bar is inserted into the first precast cup-shaped concrete floor slab on the left, and sequentially penetrates through the precast cup-shaped concrete floor slabs from left to right along the through hole to form the precast floor slab on one side. Similarly, the precast floor slab on the other side is formed from right to left; S4: Since there is a certain construction space in the short side direction of the T-shaped steel bar, all the T-shaped steel bars are pushed into the through holes; S5: Place the U-shaped steel groove in the middle of the two precast floor slabs to ensure sufficient construction space and pipeline space on both sides of the floor slabs, and then clamp out the T-shaped steel bars and tighten them; S6: Cover the steel groove cover plate. The steel cover plate and the precast floor slab are provided with holes at the positions corresponding to the vertical sleeves of the rectangular composite beam in the vertical direction, and the rectangular composite beam, the precast floor slab and the steel cover plate are connected with high-strength bolts, and nuts are screwed on at the lower part; S7: Connect the rectangular composite beam, the precast floor slab and the steel ear plates of the concrete-filled steel tube T-shaped column with high-strength bolts, and screw on nuts at the lower part to complete the assembly.

[0037] The cross-section form and connection method of the composite frame structure endow the frame structure system with the characteristics of convenient disassembly and assembly, high construction efficiency, and high steel recoverability. The cross-section form of the composite beam and precast slab enables great flexibility in their cross-section combination, meeting the requirements of different spans and structural layouts, and having strong engineering adaptability. At the same time, during on-site assembly, only the composite beam-columns need to be bolted together, eliminating the need for on-site wet concrete operations, reducing environmental pollution and resource waste, and improving construction efficiency. In addition, this type of building structure can achieve component prefabricated replacement, and has a high recovery rate after demolition to reduce the cost of the entire life cycle of the structure.

[0038] The present invention is not limited to the above-mentioned best implementation manner. Anyone can obtain various other forms of new prefabricated composite frame structures and their construction methods under the inspiration of the present invention. All equivalent changes and modifications made according to the scope of the patent application of the present invention shall fall within the scope covered by the present invention.

Claims

1. An assembled combined frame structure, characterized in that: A composite frame system composed of a concrete-filled steel tube T-shaped column, a rectangular composite beam, and a precast cup-shaped concrete floor slab. A single set of the composite frame system includes two relatively placed concrete-filled steel tube T-shaped columns, which are connected by a rectangular composite beam at the top. Along the length direction of the top of the rectangular composite beam, a number of precast cup-shaped concrete floor slabs are arranged side by side and closely attached. The inner end top of the precast cup-shaped concrete floor slab is covered with a steel cover plate, and the rectangular composite beam, the precast cup-shaped concrete floor slab, and the steel cover plate are connected and fixed by a number of vertically arranged high-strength bolts. Along the middle of the thickness direction of the precast cup-shaped concrete floor slab, a T-shaped steel bar with a threaded end is horizontally inserted, and the concrete floor slabs are connected and fixed by the T-shaped steel bars; The rectangular composite beam is formed by setting templates at the horizontal two ends of a single channel steel and pouring concrete into the channel steel. Along the length direction of the web of the channel steel of the rectangular composite beam, reserved holes are evenly arranged at intervals, and vertical sleeves are inserted into the reserved holes. The rectangular composite beam is connected to the precast cup-shaped concrete floor slab and the steel cover plate by high-strength bolts passing through the vertical sleeves. A horizontal sleeve is longitudinally inserted between the two wing plates of the channel steel of the rectangular composite beam to facilitate connection with the concrete T-shaped column by a tension bolt.

2. The prefabricated combined frame structure according to claim 1, wherein: The concrete-filled steel tube T-shaped column includes a number of vertically extending thin-walled H-shaped steel tubes, which are longitudinally arranged side by side and fixedly connected, and thin-walled channel steel tubes are fixedly connected at both longitudinal ends to form the ends of the concrete-filled steel tube T-shaped column. Steel ear plates are welded to the horizontal ends of the concrete-filled steel tube T-shaped column, and connection sleeves are longitudinally inserted on the horizontal ends to facilitate connection with the rectangular composite beam by a tension bolt.

3. The prefabricated combined frame structure according to claim 1, characterized in that: There are two sets of the rectangular composite beams, which are symmetrically arranged on both sides of the concrete-filled steel tube T-shaped column. A U-shaped steel groove for blocking the precast cup-shaped concrete floor slabs on both sides is fixedly installed in the middle of the rectangular composite beam. Concave openings for matching with the precast cup-shaped concrete floor slabs are recessed inward at both horizontal ends of the U-shaped steel groove, and a steel groove cover plate is covered on the top of the U-shaped steel groove.

4. The prefabricated combined frame structure according to claim 3, characterized in that: Threads are provided at both ends of the T-shaped steel bar. After the horizontal end passes through the precast cup-shaped concrete floor slab, it is fixed by a nut and the end abuts against the concave opening of the U-shaped steel groove. Four T-shaped steel bars are arranged in a single set of the composite frame system. Every two T-shaped steel bars are matched with a rectangular composite beam. The two T-shaped steel bars extend towards each other to both sides of the U-shaped steel groove and are tightened with nuts. The short side length of the T-shaped steel bar is greater than the bottom width of the cup-shaped concave part at the end of the precast cup-shaped concrete floor slab, so as to facilitate the formation of self-locking in the cup-shaped concave part at the end of the precast cup-shaped concrete floor slab when the nut is installed at the longitudinal end of the T-shaped steel bar and drives its short side to rotate.

5. A prefabricated combined frame structure according to claim 1, characterized in that: Through holes for the T-shaped steel bars to pass through are reserved horizontally in the middle of the precast cup-shaped concrete floor slab, and holes for the high-strength bolts to pass through are vertically opened at one end of the precast cup-shaped concrete floor slab close to the rectangular composite beam.

6. A construction method for an assembled combined frame structure, characterized in that, Adopt the prefabricated combined frame structure described in any one of claims 1-5, and proceed as follows: S1: First, after the concrete-filled steel tubular T-shaped columns and rectangular composite beams are welded respectively in the prefabrication factory, they are transported to the site for hoisting; S2: Fix the two concrete-filled steel tubular T-shaped columns, then hoist the rectangular composite beam from bottom to top to the side of the concrete-filled steel tubular T-shaped column, and connect the rectangular composite beam and the left and right concrete-filled steel tubular T-shaped columns through horizontal tie bolts; S3: Insert the T-shaped steel bars into the first precast cup-shaped concrete floor slab on the left side, and sequentially penetrate the precast cup-shaped concrete floor slab from left to right along the through holes to form a precast floor slab on one side. Similarly, form a precast floor slab on the other side from right to left; S4: Since there is a certain construction space in the short side direction of the T-shaped steel bars, push all the T-shaped steel bars into the through holes; S5: Place the U-shaped steel trough in the middle of the two precast floor slabs to ensure sufficient construction space and pipeline space on both sides of the floor slabs, then clamp out the T-shaped steel bars and tighten them; S6: Cover the steel trough cover plate. Open holes at the positions corresponding to the vertical sleeves of the rectangular composite beam in the vertical direction of the steel cover plate and the precast floor slab, and connect the rectangular composite beam, the precast floor slab, and the steel cover plate with high-strength bolts, and screw on nuts at the lower part; S7: Connect the rectangular composite beam, the precast floor slab, and the steel ear plates of the concrete-filled steel tubular T-shaped columns with high-strength bolts, and screw on nuts at the lower part to complete the assembly.

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