Assembly screw type connecting joint of steel plate-concrete variable cross-section composite column and steel beam

Abstract

The utility model provides an assembly screw type connecting node of a steel plate-concrete variable cross-section composite column and a steel beam, which comprises an upper composite column, a lower composite column and an I-shaped steel beam connected between the upper composite column and the lower composite column, the upper end of the I-shaped steel beam is provided with a second connecting flange plate corresponding to the first connecting flange plate, and the lower composite column is inserted into the I-shaped steel beam. Reliable connection of the variable cross-section composite columns is achieved through the steel beams and the flange plates, so that the connection joint has good stress performance and is simple in structure. The composite columns serve as supporting platforms of the steel beams, the steel beams serve as supporting platforms of the prefabricated slabs, the prefabricated slabs serve as bottom dies, supporting platforms and reinforcing steel bar binding operation platforms of the reinforced concrete floor slabs, different components support one another, and construction portability is improved. According to the connection joint, load transmission between the variable cross-section composite column and the steel beam is guaranteed, the good stress performance is achieved, and the integrity of the connection joint is enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of building structures, in particular to an assembly screw-type connection node for a steel plate-concrete variable-section composite column and a steel beam. Background Art

[0002] In recent years, with the transformation and upgrading of the construction industry structure, in order to improve building quality, speed up construction, achieve energy conservation and environmental protection, and reduce project costs, prefabricated buildings have received more and more attention from the engineering community. Compared with traditional building structure construction forms, prefabricated buildings have obvious technical advantages, saving labor, templates, and machinery, improving survival quality, reducing emissions, reducing pollution, and saving construction time. However, there are still many problems with prefabricated buildings today, such as the low degree of industrialization, the lack of standardization of various components of the building structure, and the connection nodes of the prefabricated building structure are the weak links of the overall building structure. There are many obstacles both from the construction and mechanical perspectives. Utility Model Content

[0003] The utility model discloses an assembly screw-type connection node of a steel plate-concrete variable-section composite column and a steel beam, aiming to improve the above technical problems.

[0004] The utility model adopts the following scheme:

[0005] An assembled screw-type connection node for a steel plate-concrete variable-section composite column and a steel beam comprises an upper composite column, a lower composite column and an I-shaped steel beam connected between the upper and lower composite columns, wherein a first connecting flange is welded to the lower end of the upper composite column, a second connecting flange is provided at the upper end of the I-shaped steel beam corresponding to the first connecting flange, and the lower composite column is plugged and fixed to the I-shaped steel beam.

[0006] As a further improvement, the upper composite column includes a first steel plate inner shell, a first ECC outer shell wrapped outside the first steel plate inner shell, a first tension screw arranged in the first steel plate inner shell, and cast-in-place core concrete; the lower composite column includes a second steel plate inner shell, a second ECC outer shell wrapped outside the second steel plate inner shell, a second tension screw arranged in the second steel plate inner shell, and cast-in-place core concrete.

[0007] As a further improvement, the lower end of the first steel plate inner shell of the upper overlapping column is provided with a notched corner, the first connecting flange corresponds to the notched corner of the lower end of the first steel plate inner shell, and the second connecting flange corresponds to the notched corner of the first connecting flange and is arranged on the four corners of the upper end of the I-shaped steel beam.

[0008] As a further improvement, a first U-shaped end plate is provided at the upper end of the first steel plate inner shell, and the first U-shaped end plate is neatly arranged with the edge of the first ECC outer shell; a second U-shaped upper end plate and a second U-shaped lower end plate are respectively provided at the upper and lower ends of the second steel plate inner shell, and the second U-shaped upper end plate and the second U-shaped lower end plate are neatly arranged with the edge of the second ECC outer shell.

[0009] As a further improvement, a number of embedded screws are evenly distributed on the first U-shaped end plate; a number of shear bolts and high-strength screws are evenly distributed on the second U-shaped upper end plate, and embedded screw holes are reserved on the second U-shaped lower end plate; and the high-strength screws are arranged on the four corners of the second U-shaped upper end plate and can pass through the second connecting flange.

[0010] As a further improvement, the I-shaped steel beam includes a third ECC shell, an upper end plate, a lower end plate, obliquely arranged stiffening ribs, tension screws and cast-in-place core concrete arranged in the stiffening ribs, the stiffening ribs are welded into the column of the I-shaped steel beam, the third ECC shell is wrapped around the outside of the stiffening ribs, and the upper end plate and the lower end plate are respectively connected to the upper and lower ends of the stiffening ribs.

[0011] As a further improvement, the stiffening rib is a steel plate.

[0012] As a further improvement, the second connecting flange is welded to the upper end plate, the upper end plate is a U-shaped upper end plate with a flange, and the lower end plate is a U-shaped lower end plate with a flange. Bolt holes are reserved on the U-shaped lower end plate with a flange, and screw holes are reserved on the U-shaped upper end plate with a flange. Channels for high-strength screws, shear bolts and connecting node stirrups to pass through are reserved at the nodes of the upper and lower end plates of the I-shaped steel beam.

[0013] As a further improvement, the I-shaped steel beam also includes a web and a transverse high-strength screw, the web is welded to the outer side of the stiffening rib and is located between the U-shaped upper end plate with flanges and the U-shaped lower end plate with flanges; the transverse high-strength screw is used to connect the first connecting flange and the second connecting flange.

[0014] As a further improvement, it also includes a prefabricated plate, which is placed on the third ECC shell of the I-shaped steel beam and is provided with plate reinforcement and formwork.

[0015] By adopting the above technical solution, the utility model can achieve the following technical effects:

[0016] The assembly screw connection node of the steel plate-concrete variable-section composite column and the steel beam of the present application realizes the reliable connection of the variable-section composite column through the I-shaped steel beam and the connecting flange, so that the connection node of the utility model not only has good force-bearing performance, but also has a simple structure and convenient construction. The composite column serves as the support platform of the I-shaped steel beam, the I-shaped steel beam serves as the support platform of the prefabricated board, and the prefabricated board serves as the bottom mold, support platform and steel bar binding work platform of the reinforced concrete floor slab. Different components support each other, which improves the portability of construction. The connection node ensures the transfer of loads between the variable-section composite column and the I-shaped steel beam, has good force-bearing performance, enhances the integrity of the connection node, and increases the applicability of the connection between composite columns of different sections and steel beams in prefabricated buildings, and has broad application prospects in prefabricated and assembled buildings. This improves the problem that the connection node of the existing prefabricated building structure is the weak link of the overall building structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a three-dimensional diagram of the upper composite column factory prefabrication stage of the assembly screw-type connection node of the utility model steel plate-concrete variable-section composite column and steel beam;

[0019] Figure 2 It is a three-dimensional diagram of the factory prefabrication stage of the lower composite column of the utility model of the assembly screw-type connection node of the steel plate-concrete variable-section composite column and the steel beam;

[0020] Figure 3 It is a three-dimensional diagram of the I-shaped steel beam factory prefabrication stage of the assembly screw-type connection node of the utility model steel plate-concrete variable-section composite column and steel beam;

[0021] Figure 4 It is a stereoscopic diagram of the internal structure assembly of the assembly screw-type connection node of the utility model steel plate-concrete variable cross-section composite column and steel beam;

[0022] Figure 5 It is a stereoscopic diagram of the overall structure assembly of an assembly screw-type connection node of a steel plate-concrete variable-section composite column and a steel beam of the utility model. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model. Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the utility model for which protection is sought, but merely represents the selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model.

[0024] Example

[0025] The first embodiment of the utility model provides an assembled screw-type connection node of a steel plate-concrete variable-section composite column and a steel beam, comprising an upper composite column 1, a lower composite column 3 and an I-shaped steel beam 2 connected between the upper and lower composite columns 3, a first connecting flange 17 welded to the lower end of the upper composite column 1, a second connecting flange 27 corresponding to the first connecting flange 17 is provided at the upper end of the I-shaped steel beam 2, the lower composite column 3 is plugged and fixed to the I-shaped steel beam 2, and the cross-sections of the upper and lower composite columns 3 are different, that is, the cross-sectional area of ​​the upper composite column 1 is reduced, the structural weight is reduced, the cross-sectional area of ​​the lower composite column 3 is increased, the overall bearing capacity and rigidity of the composite column are enhanced, and the structural stability is improved.

[0026] In this embodiment, the upper composite column 1 includes a first steel plate inner shell 12, a first ECC outer shell 11 wrapped outside the first steel plate inner shell 12, a first tension screw 13 arranged in the first steel plate inner shell 12, and cast-in-place core concrete; the lower composite column 3 includes a second steel plate inner shell 32, a second ECC outer shell 31 wrapped outside the second steel plate inner shell 32, a second tension screw 33 arranged in the second steel plate inner shell 32, and cast-in-place core concrete. The first steel plate inner shell 12 of the upper composite column 1 is provided with a missing corner at the lower end, the first connecting flange 17 is provided corresponding to the missing corner at the lower end of the first steel plate inner shell 12, and the second connecting flange 27 is provided at the four corners of the upper end of the I-shaped steel beam 2 corresponding to the missing corner of the first connecting flange 17, so as to facilitate the connection of the two connecting flanges and make the structure neat. The internal space of the upper and lower composite columns 3 serves as a formwork for cast-in-place concrete, which has multiple functions such as reducing the amount of steel used, preventing local buckling of the steel plate, enhancing column stability, fire prevention, eliminating the need for steel bar binding, and improving construction portability. It has good mechanical properties, construction performance and weather resistance.

[0027] Further, a first U-shaped end plate 14 is provided at the upper end of the first steel plate inner shell 12, and the first U-shaped end plate 14 is neatly arranged with the edge of the first ECC outer shell 11, and a plurality of pre-embedded screws 16 are evenly distributed on the first U-shaped end plate 14; a second U-shaped upper end plate 3401 and a second U-shaped lower end plate 3402 are respectively provided at the upper and lower ends of the second steel plate inner shell 32, and the second U-shaped upper end plate 3401 and the second U-shaped lower end plate 3402 are neatly arranged with the edge of the second ECC outer shell 31, and a plurality of shear bolts 36 and high-strength screws 6 are evenly distributed on the second U-shaped upper end plate 3401, and a hole for pre-embedded screws 16 is reserved on the second U-shaped lower end plate 3402, so as to facilitate the passage of the pre-embedded screws 16. The high-strength screws 6 are arranged at the four corners of the second U-shaped upper end plate 3401, and can pass through the second connecting flange 27 to realize the connection between the lower composite column 3 and the I-shaped steel beam 2.

[0028] Furthermore, the I-shaped steel beam 2 includes a third ECC shell 21, an upper end plate 2401, a lower end plate 2402, obliquely arranged stiffening ribs 29, and tension screws and cast-in-place core concrete arranged in the stiffening ribs 29. The stiffening ribs 29 are steel plates, and the stiffening ribs 29 are welded into the column of the I-shaped steel beam 2. The third ECC shell 21 is wrapped around the outside of the stiffening ribs 29, and the upper end plate 2401 and the lower end plate 2402 are respectively connected to the upper and lower ends of the stiffening ribs 29. The second connecting flange 27 is welded on the upper end plate 2401. The upper end plate 2401 is a U-shaped upper end plate 2401 with a flange, and the lower end plate 2402 is a U-shaped lower end plate 2402 with a flange. Bolt holes are reserved on the U-shaped lower end plate 2402 with a flange for the shear bolts 36 to pass through. The lower end plate 2402 of the I-shaped steel beam 2 is connected by the shear bolts 36. The shear bolts 36 play a role in transmitting shear force, which can resist the relative slip between the I-shaped steel beam 2 and the lower composite column 3, and enhance the integrity of the node. The U-shaped upper end plate 2401 with a flange is reserved with screw holes for the high-strength screws 6 to pass through. The lower composite column 3 and the I-shaped steel beam 2 are connected by the high-strength screws 6. The high-strength screws 6 also play the role of longitudinal reinforcement to resist the deformation of the node; not only that, the shear bolts 36 and the high-strength screws 6 also play a role in transmitting the end plate force. A passage for high-strength screw rods 6, shear bolts 36 and connection node stirrups 4 to pass through is reserved at the nodes of the upper and lower end plates 2402 of the I-shaped steel beam 2. The connection node stirrups 4 are formed by bending steel bars into a rectangle and are overlapped with high-strength screw rods 6 as frame bars, which play the role of node shear resistance and force transmission, and at the same time improve the integrity of the connection node.

[0029] Furthermore, the I-shaped steel beam 2 further includes a web 28 and a transverse high-strength screw 26, the web 28 being welded to the outside of the stiffening rib 29 and being located between the U-shaped upper end plate 2401 with flange and the U-shaped lower end plate 2402 with flange. The transverse high-strength screw 26 is used to connect the first connecting flange 17 and the second connecting flange 27.

[0030] In this embodiment, a prefabricated plate 5 is also included. The prefabricated plate 5 is placed on the third ECC shell 21 of the I-shaped steel beam 2 and is provided with plate reinforcement and formwork, serving as a template and construction platform for the floor slab. The reinforcement is provided to ensure the reliability of the floor slab and the stability of the connection. The above-mentioned connection as a whole can ensure the load transfer between the upper composite column 1, the lower composite column 3 and the I-shaped steel beam 2, reinforced concrete prefabricated plate 5 → I-shaped steel beam 2 → (connection node stirrups 4 →) high-strength screw 6 (→ shear bolt 36) → the second U-shaped end plate of the lower composite column 3 → the second steel plate inner shell 32 → steel plate-ECC new prefabricated composite column cast-in-place core concrete (→ the second ECC shell 31).

[0031] The construction method of the present invention comprises the following two stages:

[0032] Factory prefabrication stage:

[0033] 1. The upper composite column 1 is prefabricated in the factory: first, according to the design and calculation requirements of the column section, the appropriate size of the first steel plate inner shell 12 is selected to be processed into a rectangle (the appropriate steel plate size refers to the size of the first steel plate inner shell 12 that meets the requirements of the steel content ratio of the section, that is, the economy and the force); secondly, the first tension screws 13 are arranged on the first steel plate inner shell 12 at an appropriate spacing (the appropriate spacing refers to the arrangement of the first tension screws 13 that meets the requirements of the stability of the first steel plate inner shell 12 structure prefabrication stage); the first U-shaped end plate 14 is welded to the upper end of the upper composite column 1, and the first U-shaped end plate 14 is welded to the first steel plate inner shell 12. After the four corners are sheared at the lower end of the first steel plate inner shell 12, the first connecting flange 17 is welded, and the first connecting flange 17 is also missing corners; finally, the upper composite column 1 is supported on its side, and the first ECC outer shell 11 is poured and cured. The lower composite column 3 is prefabricated in the factory: first, according to the design and calculation requirements of the column section, the appropriate size of the second steel plate inner shell 32 is selected to be processed into a rectangle (the appropriate steel plate size refers to the size of the second steel plate inner shell 32 that meets the requirements of the cross-sectional steel content, that is, the economy and force); secondly, the second tension screws 33 are arranged on the second steel plate inner shell 32 at an appropriate spacing (the appropriate spacing refers to the setting of the second tension screws 33 that meets the stability requirements of the second steel plate inner shell 32 structure prefabrication stage); second U-shaped end plates are welded at the upper and lower ends of the lower composite column 3 respectively, and the second U-shaped end plates are welded to the second steel plate inner shell 32; finally, the column is supported on its side, and the second ECC outer shell 31 is poured and cured.

[0034] Among them, it should be noted that for the upper and lower end plates 2402 of the I-shaped steel beam 2, the upper end plate 2401 connected to the upper composite column 1 needs to be welded with the second connecting flange 27, and the lower end plate 2402 connected to the lower composite column 3 needs to reserve holes and welding platforms for the connection of high-strength screws 6 and shear bolts 36 in the lower end plate 2402; for the upper and lower second U-shaped end plates of the lower composite column 3, it should also be noted that the second U-shaped upper end plate 3401 connecting the steel beam needs to be pre-embedded with high-strength screws 6 and shear bolts 36, and the second U-shaped lower end plate 3402 of the lower composite column 3 has reserved holes and welding platforms for pre-embedded screws 16; at the same time, it should be noted that the first connecting flange 17 should be welded inside the lower end face of the upper composite column 1, and attention should be paid to reserving an operating platform for the connection of the high-strength screw 6 during formwork casting. Finally, it should be noted that the cross-sectional sizes of the second U-shaped end plates of the lower composite column 3 are different, and attention should be paid to the direction when welding and connecting the screws. Figure 1 , Figure 2 .

[0035] 2. I-shaped steel beam 2 factory prefabrication

[0036] When the I-shaped steel beam 2 is prefabricated in the factory, according to the design and calculation requirements of the column section, the appropriate steel plate size is selected to be processed into a rectangle with a suitable cross-sectional size (the appropriate steel plate size refers to the steel plate size that meets the requirements of the steel content ratio of the section, that is, the economy and force), and the column is welded by using a steel plate with a certain inclination as a stiffening rib 29, and then the web 28 of the I-shaped steel beam 2 is welded to the outside of the stiffening rib 29, and tension screws are set on the stiffening rib 29 steel plate with a suitable spacing (the appropriate spacing means that the setting of the tension screws meets the stability requirements of the stiffening rib 29 steel plate structure prefabrication stage); U-shaped end plates with flanges are welded to the upper and lower ends of the welded column and the web 28, and the upper end plate 2401 is welded to the stiffening rib 29 steel plate; then the second connecting flange 27 is welded to the U-shaped upper end plate 2401 with flange; finally, the column is supported on its side, and the third ECC shell 21 is poured and cured.

[0037] Among them, the U-shaped lower end plate 2402 with flange should be reserved with bolt holes to form multiple shear bolt 36 channels, and the U-shaped upper end plate 2401 with flange is pre-welded with a flange and reserved with screw holes to form four high-strength screw 6 channels (the upper and lower end plates 2402 of the I-shaped steel beam 2 reserve the high-strength screw 6 at the node, the embedded shear bolt 36, and the connection node stirrup 4 through the channel). Figure 3 .

[0038] 3. Prefabricated panels 5 factory prefabricated

[0039] The formwork is laid in the factory to complete the pouring and curing of the prefabricated hollow slab.

[0040] At this stage, after the upper composite column 1, I-shaped steel beam 2, lower composite column 3, and prefabricated plate 5 are prefabricated in the factory and transported to the site, the assembly construction of the prefabricated node begins. First, place the I-shaped steel beam 2 on the high-strength screw 6 and shear bolt 36 of the lower composite column 3, pass the screw channel reserved in the upper and lower end plates 2402 of the I-shaped steel beam 2 through the high-strength screw 6 of the second U-shaped upper end plate 3401 of the lower composite column 3 and connect, pass the shear bolt 36 channel reserved in the lower end plate 2402 of the I-shaped steel beam 2 through the shear bolt 36 of the second U-shaped upper end plate 3401 of the lower composite column 3 and connect, lay out the connection node stirrups 4 and Binding, then connect the second connection flange 27 of the upper composite column 1 and the upper end plate 2401 of the I-shaped steel beam 2 through the transverse high-strength screw 26 inserted into the hole to complete the assembly of the upper composite column 1, then place the prefabricated plate 5 on the I-shaped steel beam 2 and lay out the plate reinforcement and formwork, and finally complete the concrete pouring and curing of the reinforced concrete prefabricated plate 5 and the cast-in-place core of the steel plate-ECC new prefabricated composite column. When the concrete strength reaches the design requirements, the on-site construction stage is completed. Figure 4 , Figure 5 .

[0041] The above are only preferred implementations of the present utility model. The protection scope of the present utility model is not limited to the above embodiments. All technical solutions under the concept of the present utility model belong to the protection scope of the present utility model.

Claims

1. An assembly screw connection node between a steel plate-concrete variable-section composite column and a steel beam, characterized in that: It includes an upper composite column, a lower composite column and an I-shaped steel beam connected between the upper and lower composite columns. A first connecting flange is welded to the lower end of the upper composite column, and a second connecting flange is provided at the upper end of the I-shaped steel beam corresponding to the first connecting flange. The lower composite column is plugged and fixed to the I-shaped steel beam.

2. The assembly screw connection node of the steel plate-concrete variable cross-section composite column and the steel beam according to claim 1 is characterized in that: The upper composite column includes a first steel plate inner shell, a first ECC outer shell wrapped outside the first steel plate inner shell, a first tension screw arranged in the first steel plate inner shell, and cast-in-place core concrete; the lower composite column includes a second steel plate inner shell, a second ECC outer shell wrapped outside the second steel plate inner shell, a second tension screw arranged in the second steel plate inner shell, and cast-in-place core concrete.

3. The assembly screw connection node of the steel plate-concrete variable cross-section composite column and the steel beam according to claim 2 is characterized in that: The first steel plate inner shell of the upper composite column has a missing corner at the lower end, the first connecting flange corresponds to the missing corner of the lower end of the first steel plate inner shell, and the second connecting flange corresponds to the missing corner of the first connecting flange and is arranged on the four corners of the upper end of the I-shaped steel beam.

4. The assembly screw connection node of the steel plate-concrete variable cross-section composite column and the steel beam according to claim 3 is characterized in that: A first U-shaped end plate is provided at the upper end of the first steel plate inner shell, and the first U-shaped end plate is neatly arranged with the edge of the first ECC outer shell; a second U-shaped upper end plate and a second U-shaped lower end plate are respectively provided at the upper and lower ends of the second steel plate inner shell, and the second U-shaped upper end plate and the second U-shaped lower end plate are neatly arranged with the edge of the second ECC outer shell.

5. The assembly screw connection node of the steel plate-concrete variable cross-section composite column and the steel beam according to claim 4 is characterized in that: A number of embedded screws are evenly distributed on the first U-shaped end plate; a number of shear bolts and high-strength screws are evenly distributed on the second U-shaped upper end plate, and embedded screw holes are reserved on the second U-shaped lower end plate; and the high-strength screws are arranged on the four corners of the second U-shaped upper end plate and can pass through the second connecting flange.

6. The assembly screw connection node of the steel plate-concrete variable cross-section composite column and the steel beam according to claim 5 is characterized in that: The I-shaped steel beam includes a third ECC shell, an upper end plate, a lower end plate, obliquely arranged stiffening ribs, tension screws arranged in the stiffening ribs, and cast-in-place core concrete. The stiffening ribs are welded into the column of the I-shaped steel beam, the third ECC shell is wrapped around the outside of the stiffening ribs, and the upper end plate and the lower end plate are respectively connected to the upper and lower ends of the stiffening ribs.

7. The assembly screw connection node of the steel plate-concrete variable cross-section composite column and the steel beam according to claim 6 is characterized in that: The stiffening rib is a steel plate.

8. The assembly screw connection node of the steel plate-concrete variable cross-section composite column and the steel beam according to claim 6, characterized in that: The second connecting flange is welded to the upper end plate, the upper end plate is a U-shaped upper end plate with a flange, and the lower end plate is a U-shaped lower end plate with a flange. Bolt holes are reserved on the U-shaped lower end plate with a flange, and screw holes are reserved on the U-shaped upper end plate with a flange. Channels for high-strength screws, shear bolts and connecting node stirrups to pass through are reserved at the nodes of the upper and lower end plates of the I-shaped steel beam.

9. The assembly screw connection node of the steel plate-concrete variable cross-section composite column and the steel beam according to claim 8, characterized in that: The I-shaped steel beam also includes a web and transverse high-strength screws, wherein the web is welded to the outer side of the stiffening rib and is located between the U-shaped upper end plate with flanges and the U-shaped lower end plate with flanges; the transverse high-strength screws are used to connect the first connecting flange and the second connecting flange.

10. The assembly screw connection node of the steel plate-concrete variable cross-section composite column and the steel beam according to claim 6, characterized in that: It also includes a prefabricated plate, which is placed on the third ECC shell of the I-shaped steel beam and is provided with plate reinforcement and formwork.

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