Steel-concrete composite beam structure assembled by hot-rolled section steel and construction method of steel-concrete composite beam structure

Abstract

The invention discloses a steel-concrete composite beam structure assembled by hot-rolled section steel and a construction method of the steel-concrete composite beam structure. The composite beam structure comprises two pieces of H-shaped section steel; channel steel; two pieces of angle steel with opposite openings are arranged on the upper flange plates on the two sides of the channel steel; two folding flanges are arranged on the top face of the steel tank, and the transverse inner side faces of the folding flanges are connected to a lower flange plate of one piece of H-shaped steel; the bottom end of the long bolt rod is provided with a nut and embedded into concrete poured in the steel groove, the top end of the long bolt rod is upwards fastened, the upper flange plate and the transverse plate of the angle steel are connected in an overlapped mode, and the top end of the long bolt rod is provided with a nut and embedded into concrete poured in a groove cavity formed between the angle steel. According to the steel-concrete composite beam structure and the construction method thereof, the steel-concrete composite beam can be formed by directly assembling the hot-rolled section steel products on site, the steel structure machining and manufacturing links are avoided, welding, formwork installation and steel bar binding operation are not needed, the technological process is greatly shortened, independent replacement of a single component can be achieved in the operation period, and economic benefits are remarkable.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge construction, and in particular relates to a steel-concrete composite beam structure assembled by hot-rolled steel sections and a construction method thereof. Background Art

[0002] Compared with ordinary reinforced concrete beam bridges, steel-concrete composite bridges have the advantages of light weight, short construction period, and reasonable force, and are widely used in the engineering field. In addition, with the continuous development of bridge construction technology, prefabrication and assembly technology has emerged. The components are processed and manufactured in the factory and then transported to the site for installation. The environmental impact is small, the construction period is controllable, and the quality is greatly improved. Therefore, the application of prefabricated steel-concrete composite bridges that combine steel-concrete composite bridges with prefabrication and assembly technology has gradually developed. However, the steel beam part of the existing prefabricated steel-concrete composite beam still needs to be welded and formed by the steel structure processing plant and then transported to the site for installation, and then the formwork is installed, the steel bars are tied, and the concrete slab is poured. There are many process flows, the welding workload is large, and it is easy to cause weld fatigue cracking during the operation period. Therefore, the steel-concrete composite bridge structure directly assembled by hot-rolled steel avoids the manufacturing link of the steel structure processing plant, and does not require welding, installation of formwork, and tying of steel bars; the process flow is simple, the construction efficiency is high, and the economic benefits are significant. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a steel-concrete composite beam structure assembled with hot-rolled steel sections and a construction method thereof, thereby reducing the difficulty of on-site installation of components, avoiding the erection of traditional formwork, reducing construction workload, and greatly shortening the construction period.

[0004] To achieve the above object, the present invention is implemented by adopting the following technical solutions:

[0005] In a first aspect, the present invention provides a steel-concrete composite beam structure assembled with hot-rolled steel sections, comprising:

[0006] Two H-shaped steels, with gaps left between the upper flange plates and the lower flange plates in the transverse direction;

[0007] A channel steel spanning the gap between the two upper flange plates and connecting the two upper flange plates;

[0008] Two angle steels with openings facing each other are arranged on the upper flange plates on both sides of the channel steel, and the angle steels are fixed to each other by a number of steel bars that penetrate the channel steel transversely;

[0009] The steel channel has two folded flanges facing each other and open in the middle on its top surface, and the lateral inner side surfaces of the folded flanges are fastened by a plurality of long bolt rods and overlapped and connected to a lower flange plate of an H-shaped steel;

[0010] The bottom end of the long bolt rod is equipped with a nut and embedded in the concrete cast in the steel trough. The top end of the long bolt rod is fastened upward and overlapped with the upper flange plate and the cross plate of the angle steel. The top end is equipped with a nut and embedded in the concrete cast in the groove cavity formed between the angle steels.

[0011] Furthermore, the long bolt rod passes through the lower flange plate and the folded flange and is fixed by nuts on both sides respectively; the long bolt rod passes through the upper flange plate and the cross plate of the angle steel and is fixed by nuts on both sides respectively.

[0012] Furthermore, nuts for connecting the threaded ends of the steel bars are welded on the side vertical plates of the angle steel.

[0013] Furthermore, the steel bar is a precision-rolled threaded steel bar with threads at both ends.

[0014] Furthermore, a plurality of spoon-shaped holes for passing the long bolt rods are respectively formed on the folded flange of the steel channel, the transverse plate of the angle steel, and the upper flange plate and the lower flange plate of the H-shaped steel.

[0015] Furthermore, the folded flange is connected to the top of the vertical side plate of the steel channel through a rotatable hinge.

[0016] Furthermore, a spoon-shaped hole for passing the steel bar is provided on the vertical side plate of the channel steel.

[0017] Furthermore, two nuts for screwing and clamping the two sides of the channel steel are arranged in the middle of the steel bar.

[0018] In another aspect, the present invention provides a construction method of a steel-concrete composite beam structure assembled with hot-rolled steel sections as described in the first aspect, comprising the following method steps:

[0019] Step S1: Preparation: Check the construction site to ensure that it meets safety requirements; prepare the required materials and equipment, including H-shaped steel, channel steel, angle steel, long bolt rods, nuts, and concrete;

[0020] Step S2: Installing H-beams: Prepare several sections of hot-rolled H-beams. Take the hot-rolled H-beams of the Nth section as an example, position and install the hot-rolled H-beams of the N-1th section. Place the two H-beams at the designed position and support them with a temporary support frame to ensure horizontality and verticality. Ensure that a predetermined gap is left between the upper flange plates and between the lower flange plates.

[0021] Step S3: Installing channel steel and angle steel: Install the connecting channel steel in the gap between the two upper flange plates; arrange two angle steels with openings facing each other on the upper flange plates on both sides of the channel steel, and fix the angle steels by steel bars that penetrate the spoon-shaped holes on the channel steels horizontally, wherein the steel bars are finely rolled threaded steel bars with threads, and the two ends are fixedly connected to the nuts welded on the vertical side plates of the angle steels, and two nuts for screwing and clamping the two sides of the channel steels are arranged in the middle to fix their horizontal connection positions;

[0022] Step S4: Install the steel channel: Place the steel channel at the designed position so that the two folded flanges of the steel channel overlap on the outer extended plate surface of the lower flange plates of the two H-shaped steels, and ensure that they are aligned with the spoon-shaped holes on the lower flange plates of the H-shaped steels; use a long bolt rod to pass through the spoon-shaped holes, and tighten the nuts on both sides to fasten the folded flanges of the steel channel to the lower flange plates of the H-shaped steels, ensuring stability and alignment;

[0023] The bottom end of the long bolt rod is installed with a nut and embedded in the steel groove, the top end of the long bolt rod is tightened upward and overlapped with the upper flange plate and the cross plate of the angle steel, and the top end is installed with a nut and embedded in the groove cavity formed between the angle steels;

[0024] Step S5: pouring concrete: pouring concrete inside the steel channel, embedding the bottom end of the long bolt rod and the nut therein, ensuring that the concrete is completely filled; at the same time, pouring concrete in the groove cavity formed between the angle steels, filling and wrapping the top end of the long bolt rod, the channel steel, the bolt and the nut, ensuring stability and firm connection;

[0025] Step S6: Acceptance and adjustment: Check the construction quality to ensure that the various components of the composite beam structure are firmly installed, tightly connected, and meet the design requirements; adjust and repair problems that arise during construction to ensure the safety and stability of the structure.

[0026] Furthermore, step S4 also includes:

[0027] Hoist the steel channel with foldable flange plates, rotate the foldable flange plates on both sides of the steel channel 270° into the channel, seal the joints between the foldable flange plates and the root of the H-steel web plates with sealant, connect the foldable flange plates and the hot-rolled H-steel flanges with long bolt rods, and pour concrete in the steel channel.

[0028] Compared with the prior art, the invention has the following beneficial effects: the invention provides a steel-concrete composite beam structure assembled with hot-rolled steel and a construction method thereof. The structure fixes the steel channel, angle steel and channel steel to the upper flange of the H-shaped steel by bolts and welding, thereby increasing the rigidity of the entire structure. At the same time, the steel channel, angle steel and channel steel can be used as a formwork for concrete, avoiding the erection of traditional formwork and greatly shortening the construction period.

[0029] In the top slab concrete, the steel bars are fixed by bolts, without the need for stirrups or tying, which significantly reduces the workload of on-site construction and greatly saves labor costs.

[0030] Compared with prefabricated steel-concrete composite structures, the concrete of this structure is cast in situ, which has low construction precision requirements, can reduce the difficulty of on-site installation of components and speed up the construction progress; while improving the overall stiffness, it significantly reduces the construction cost and construction period, and has high economic benefits and practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A three-dimensional structural schematic diagram of a steel-concrete composite beam structure assembled with hot-rolled steel sections according to the present invention;

[0032] Figure 2 The long bolt rod fixed between the top plate and the top plate of the present invention;

[0033] Figure 3 It is a schematic diagram of a steel channel with rotatable hinges and foldable flanges according to the present invention;

[0034] Figure 4 The H-shaped steel with a spoon-shaped hole of the present invention;

[0035] Figure 5 The channel steel of the present invention has threaded steel bars passing through it and has spoon-shaped holes on the flange;

[0036] Figure 6 Angle steel with spoon-shaped holes and welded nuts on the two limbs of the present invention;

[0037] In the figure:

[0038] 1. Angle steel; 2. H-shaped steel; 3. Steel channel; 4. High-precision rolled threaded steel; 5. Long bolt rod; 6. Channel steel; 7. Cast-in-place concrete slab; 8. Nut; 9. Rotatable hinge; 10. Spoon-shaped hole; 11. Folded flange; 12. Gap. DETAILED DESCRIPTION

[0039] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0040] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0041] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0042] like Figure 1 As shown, an embodiment of the present invention provides a steel-concrete composite beam structure assembled with hot-rolled steel sections, comprising:

[0043] Two H-shaped steels 2, with gaps 12 left between the upper flange plates and between the lower flange plates in the transverse direction;

[0044] A channel steel 6 spanning the gap 12 between the two upper flange plates and connecting the two upper flange plates;

[0045] Two angle steels 1 with openings facing each other are arranged on the upper flange plates on both sides of the channel steel 6, and the angle steels 1 are fixed to each other by a plurality of steel bars that penetrate the channel steel 6 transversely;

[0046] The steel channel 3 has two folded flanges 11 disposed opposite to each other and opened in the middle on its top surface, and the lateral inner side surfaces of the folded flanges 11 are fastened by a plurality of long bolt rods 5 and are overlapped and connected to a lower flange plate of an H-shaped steel 2;

[0047] The bottom end of the long bolt rod 5 is installed with a nut 8 and embedded in the concrete poured in the steel trough 3. The top end of the long bolt rod 5 is tightened upward and overlapped with the upper flange plate and the cross plate of the angle steel 1. The top end is installed with a nut 8 and embedded in the concrete poured in the groove cavity formed between the angle steels 1.

[0048] In this embodiment, the long bolt rod 5 passes through the lower flange plate and the folded flange 11 and is fixed by nuts 8 on both sides; the long bolt rod 5 passes through the upper flange plate and the cross plate of the angle steel 1 and is fixed by nuts 8 on both sides.

[0049] Nuts 8 for connecting the threaded ends of steel bars are welded to the side vertical plates of the angle steel 1 .

[0050] The steel bar is a finely rolled threaded steel bar 4 with threads at both ends. Two nuts 8 for screwing and clamping the two sides of the channel steel 6 are arranged in the middle of the steel bar.

[0051] In some specific embodiments, the steel bar can also be divided into three sections, one section is arranged in the channel steel 6 and nuts 8 are arranged at both ends of the section; the other two sections are placed between the angle steel 1 and the channel steel 6 and are connected and fixed by nuts 8.

[0052] like Figure 3 to Figure 6 As shown, a plurality of spoon-shaped holes 10 for passing the long bolt rods 5 are respectively provided on the folded flange 11 of the steel channel 3, the transverse plate of the angle steel 1, and the upper flange plate and the lower flange plate of the H-shaped steel 2.

[0053] A spoon-shaped hole 10 for passing the steel bar is provided on the vertical side plate of the channel steel 6 , and the nut 8 can be arranged in the spoon-shaped hole 10 or on one side.

[0054] The folded flange 11 can be a fixedly formed setting, or can be connected to the top of the vertical side plate of the steel channel 3 through a rotatable hinge 9.

[0055] In this embodiment, a number of transverse steel bars may be evenly arranged between the long bolt rods 5 that protrude upward and are embedded in the concrete according to actual design requirements. For example, three or four transverse steel bars may be arranged between two long bolt rods 5 .

[0056] On the other hand, an embodiment of the present invention further provides a construction method of a steel-concrete composite beam structure assembled with the hot-rolled steel sections as described above, comprising the following method steps:

[0057] Step S1: Preparation: Check the construction site to ensure that it meets safety requirements; prepare the required materials and equipment, including H-shaped steel 2, channel steel 6, angle steel 1, long bolt rod 5, nut 8, and concrete;

[0058] Step S2: installing H-beam 2: preparing several sections of hot-rolled H-beam 2, taking the hot-rolled H-beam 2 of the Nth section as an example, positioning and installing the hot-rolled H-beam 2 of the N-1th section, placing the two H-beams 2 at the designed position, and supporting them with a temporary support frame to ensure horizontality and verticality; ensuring that a predetermined gap 12 is left between the upper flange plates and between the lower flange plates;

[0059] Step S3: Install the channel steel 6 and the angle steel 1: Install the connecting channel steel 6 in the gap 12 between the two upper flange plates; set two angle steels 1 with openings facing each other on the upper flange plates on both sides of the channel steel 6, and fix the angle steel 1 through steel bars that horizontally penetrate the spoon-shaped holes 10 on the channel steel 6, wherein the steel bars are made of threaded fine-rolled threaded steel 4, and the two ends are fixedly connected to the nuts 8 welded on the vertical side plates of the angle steel 1, and two nuts 8 for screwing and clamping the two sides of the channel steel 6 are set in the middle to fix its horizontal connection position;

[0060] Step S4: Install the steel channel 3: Place the steel channel 3 at the designed position, so that the two folded flanges 11 of the steel channel 3 are overlapped on the outer extended plate surface of the lower flange plates of the two H-shaped steels 2, and ensure that they are aligned with the spoon-shaped holes 10 on the lower flange plates of the H-shaped steels 2; Use the long bolt rod 5 to pass through the spoon-shaped holes 10, and tighten the nuts 8 on both sides to fasten the folded flanges 11 of the steel channel 3 to the lower flange plates of the H-shaped steels 2 to ensure stability and alignment;

[0061] The bottom end of the long bolt rod 5 is installed with a nut 8 and embedded in the steel groove 3, the top end of the long bolt rod 5 is fastened upward and overlapped with the upper flange plate and the cross plate of the angle steel 1, and the top end is installed with a nut 8 and embedded in the groove cavity formed between the angle steels 1;

[0062] Step S5: pouring concrete: pouring concrete inside the steel channel 3, embedding the bottom end of the long bolt rod 5 and the nut 8 therein, ensuring that the concrete is completely filled; at the same time, pouring concrete in the groove cavity formed between the angle steels 1, filling and wrapping the top end of the long bolt rod 5, the channel steel 6, the bolt and the nut 8, ensuring stability and firm connection;

[0063] Step S6: Acceptance and adjustment: Check the construction quality to ensure that the various components of the composite beam structure are firmly installed, tightly connected, and meet the design requirements; adjust and repair problems that arise during construction to ensure the safety and stability of the structure.

[0064] In some embodiments, step S4 also includes the following specific steps:

[0065] The steel channel 3 with foldable flange 11 plates is hoisted, and the foldable flange 11 plates on both sides of the steel channel 3 are rotated 270° into the channel. The joints between the foldable flange 11 plates and the root of the web of the H-shaped steel 2 are sealed with sealant. The foldable flange 11 plates are connected to the flange of the hot-rolled H-shaped steel 2 with long bolt rods 5, and concrete is poured in the steel channel 3.

[0066] In summary, the steel-concrete composite beam structure assembled with hot-rolled steel provided by the present invention has high strength and stability by combining hot-rolled steel and concrete, and can withstand complex loads and environmental conditions; the structural design allows flexible application in different engineering projects, and the size and shape of the components can be adjusted as needed to adapt to various construction requirements.

[0067] The use of concrete in steel-concrete composite structures increases the durability of the structure, enabling it to withstand the long-term impact of environmental factors such as climate change, humidity and chemical erosion; and the use of steel-concrete composite structures can simplify the construction process and shorten the construction period, thereby reducing project costs and improving efficiency.

[0068] In addition, the steel and concrete in the steel-concrete composite beam structure can be recycled and reused to reduce resource waste and negative impact on the environment. This steel-concrete composite beam structure assembled with hot-rolled steel not only has superior mechanical properties and durability, but also has the advantages of high construction efficiency, environmental protection and energy saving, and is suitable for the needs of various engineering construction projects.

[0069] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A steel-concrete composite beam structure assembled with hot-rolled steel sections, characterized in that: include: Two H-shaped steels, with gaps left between the upper flange plates and the lower flange plates in the transverse direction; A channel steel spanning the gap between the two upper flange plates and connecting the two upper flange plates; Two angle steels with openings facing each other are arranged on the upper flange plates on both sides of the channel steel, and the angle steels are fixed to each other by a number of steel bars that penetrate the channel steel transversely; The steel channel has two folded flanges facing each other and open in the middle on its top surface, and the lateral inner side surfaces of the folded flanges are fastened by a plurality of long bolt rods and overlapped and connected to a lower flange plate of an H-shaped steel; The bottom end of the long bolt rod is equipped with a nut and embedded in the concrete cast in the steel trough. The top end of the long bolt rod is fastened upward and overlapped with the upper flange plate and the cross plate of the angle steel. The top end is equipped with a nut and embedded in the concrete cast in the groove cavity formed between the angle steels.

2. The steel-concrete composite beam structure assembled with hot-rolled steel sections according to claim 1 is characterized in that: The long bolt rod passes through the lower flange plate and the folded flange and is fixed by nuts on both sides respectively; the long bolt rod passes through the upper flange plate and the cross plate of the angle steel and is fixed by nuts on both sides respectively.

3. The steel-concrete composite beam structure assembled with hot-rolled steel sections according to claim 2 is characterized in that: Nuts for connecting the threaded ends of the steel bars are welded on the side vertical plates of the angle steel.

4. The steel-concrete composite beam structure assembled with hot-rolled steel sections according to claim 3 is characterized in that: The steel bar is a precision-rolled threaded steel bar with threads at both ends.

5. The steel-concrete composite beam structure assembled with hot-rolled steel sections according to any one of claims 1 to 4, characterized in that: The folded flange of the steel channel, the transverse plate of the angle steel, the upper flange plate and the lower flange plate of the H-shaped steel are respectively provided with a plurality of spoon-shaped holes for passing the long bolt rods.

6. The steel-concrete composite beam structure assembled with hot-rolled steel sections according to claim 5 is characterized in that: The folded flange is connected to the top of the vertical side plate of the steel channel through a rotatable hinge.

7. The steel-concrete composite beam structure assembled with hot-rolled steel sections according to claim 6 is characterized in that: The vertical side plates of the channel steel are provided with spoon-shaped holes for passing the steel bars.

8. The steel-concrete composite beam structure assembled with hot-rolled steel sections according to claim 7 is characterized in that: Two nuts for screwing and clamping the two sides of the channel steel are arranged in the middle of the steel bar.

9. A construction method for a steel-concrete composite beam structure assembled with hot-rolled steel sections as claimed in any one of claims 1 to 8, characterized in that: The method comprises the following steps: Step S1: Preparation: Check the construction site to ensure that it meets safety requirements; prepare the required materials and equipment, including H-shaped steel, channel steel, angle steel, long bolt rods, nuts, and concrete; Step S2: Installing H-beams: Prepare several sections of hot-rolled H-beams. Take the hot-rolled H-beams of the Nth section as an example, position and install the hot-rolled H-beams of the N-1th section. Place the two H-beams at the designed position and support them with a temporary support frame to ensure horizontality and verticality. Ensure that a predetermined gap is left between the upper flange plates and between the lower flange plates. Step S3: Installing channel steel and angle steel: Install the connecting channel steel in the gap between the two upper flange plates; arrange two angle steels with openings facing each other on the upper flange plates on both sides of the channel steel, and fix the angle steels by steel bars that penetrate the spoon-shaped holes on the channel steels horizontally, wherein the steel bars are finely rolled threaded steel bars with threads, and the two ends are fixedly connected to the nuts welded on the vertical side plates of the angle steels, and two nuts for screwing and clamping the two sides of the channel steels are arranged in the middle to fix their horizontal connection positions; Step S4: Install the steel channel: Place the steel channel at the designed position so that the two folded flanges of the steel channel overlap on the outer extended plate surface of the lower flange plates of the two H-shaped steels, and ensure that they are aligned with the spoon-shaped holes on the lower flange plates of the H-shaped steels; use a long bolt rod to pass through the spoon-shaped holes, and tighten the nuts on both sides to fasten the folded flanges of the steel channel to the lower flange plates of the H-shaped steels, ensuring stability and alignment; The bottom end of the long bolt rod is installed with a nut and embedded in the steel groove, the top end of the long bolt rod is tightened upward and overlapped with the upper flange plate and the cross plate of the angle steel, and the top end is installed with a nut and embedded in the groove cavity formed between the angle steels; Step S5: pouring concrete: pouring concrete inside the steel channel, embedding the bottom end of the long bolt rod and the nut therein, ensuring that the concrete is completely filled; at the same time, pouring concrete in the groove cavity formed between the angle steels, filling and wrapping the top end of the long bolt rod, the channel steel, the bolt and the nut, ensuring stability and firm connection; Step S6: Acceptance and adjustment: Check the construction quality to ensure that the various components of the composite beam structure are firmly installed, tightly connected, and meet the design requirements; adjust and repair problems that arise during construction to ensure the safety and stability of the structure.

10. The construction method of the steel-concrete composite beam structure assembled with hot-rolled steel sections according to claim 9 is characterized in that: Step S4 also includes: Hoist the steel channel with foldable flange plates, rotate the foldable flange plates on both sides of the steel channel 270° into the channel, seal the joints between the foldable flange plates and the root of the H-steel web plates with sealant, connect the foldable flange plates and the hot-rolled H-steel flanges with long bolt rods, and pour concrete in the steel channel.

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