Prefabricated ECC-steel plate-concrete superposed beam

Abstract

The utility model provides a prefabricated ECC-steel plate-concrete superposed beam, and relates to the technical field of building structures. Comprising an ECC outer shell, a steel plate inner shell is fixedly installed in the ECC outer shell, core concrete is poured in the steel plate inner shell, and a plurality of opposite-pull screws are further arranged in the steel plate inner shell to be matched with the core concrete to jointly reinforce the strength of the superposed beam. According to the composite beam, the strength of the composite beam can be improved, and meanwhile machining and construction are convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of building structures, in particular to a prefabricated ECC-steel plate-concrete composite beam. Background Art

[0002] With the transformation and upgrading of the construction industry structure, in order to improve construction efficiency and quality, prefabricated buildings are increasingly receiving attention and attention from the engineering community. Today, there are still many problems with prefabricated beam buildings on the market, such as low industrialization, and compared with ordinary concrete beams, steel-concrete beams have low cost, convenient construction, and good durability.

[0003] The new type of prefabricated composite beam of steel plate-high ductility fiber concrete is a new type of prefabricated composite beam component, which consists of an outer ECC (high-performance fiber reinforced concrete) shell, a U-shaped steel plate inner shell, eyebolts, tension screws, embedded high-strength screws, U-shaped end plates, and core concrete. This component has multiple functions such as reducing the amount of steel used, enhancing the stability, ductility, and fire resistance of the beam, and improving the portability of construction. It has good mechanical properties, construction performance, and weather resistance. However, the existing new type of prefabricated composite beam of steel plate-high ductility fiber concrete has poor stress performance at the connection node, and the construction is relatively complicated, resulting in low construction efficiency. Utility Model Content

[0004] In view of this, the purpose of the utility model is to provide a prefabricated ECC-steel plate-concrete composite beam to solve the problem of poor stress performance of existing prefabricated composite beams at connection nodes.

[0005] The utility model adopts the following scheme: the application provides a prefabricated ECC-steel plate-concrete composite beam, including: an ECC outer shell, a steel plate inner shell fixedly installed in the ECC outer shell, and core concrete poured in the steel plate inner shell, and a plurality of tension screws are also arranged inside the steel plate inner shell to cooperate with the core concrete to strengthen the strength of the composite beam.

[0006] Furthermore, at least one eye bolt is formed inside one end of the steel plate inner shell.

[0007] Furthermore, the steel plate inner shell is a U-shaped steel plate inner shell with flanges, and embedded screws perpendicular to the tension screws are installed on the flanges to facilitate the connection of the composite beam to the floor slab.

[0008] Furthermore, the embedded screw penetrates into the ECC shell.

[0009] Furthermore, U-shaped end plates are fixedly provided at the two ends of the steel plate inner shell, and a plurality of high-strength screws having the same length direction as the composite beam are pre-embedded on the U-shaped end plates.

[0010] Furthermore, the U-shaped end plates are fixed to both ends of the steel plate inner shell by welding.

[0011] Beneficial effects:

[0012] The utility model adopts a composite assembled connection of tension screws, end plates and eyebolts between the U-shaped steel plate inner shells. The tension screws at the web of the beam can effectively prevent local buckling of the steel plate and enhance stability. At the same time, the tension screws can provide binding force for the beam, replacing the role of stirrups to a certain extent, and effectively reducing the amount of steel bars. The new prefabricated ECC-steel plate-concrete composite beam adopts ECC pouring on the outside to form an ECC outer shell, and the ECC outer shell will improve the overall stability, ductility and fire resistance of the beam, and at the same time has good mechanical properties, can ensure the load transfer between beams, and has good force-bearing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is an elevation view of the steel plate shell of the prefabricated ECC-steel plate-concrete composite beam member in the factory prefabrication stage of the embodiment of the utility model;

[0014] Figure 2 This is a vertical view of the U-shaped end plates with pre-embedded screws on both sides of the embodiment of the utility model;

[0015] Figure 3 This is a structural elevation view of a prefabricated ECC-steel plate-concrete composite beam component according to an embodiment of the utility model.

[0016] Reference numerals: ECC outer shell 11 , steel plate inner shell 12 , core concrete 13 , end plate 14 , tension screw 15 , eye screw 16 , high-strength screw 17 , embedded screw 18 . DETAILED DESCRIPTION

[0017] Combination Figures 1 to 3 As shown, this embodiment provides a prefabricated ECC-steel plate-concrete composite beam, including: an ECC outer shell 11, a steel plate inner shell 12 fixedly installed in the ECC outer shell 11, and core concrete 13 poured in the steel plate inner shell 12, and a plurality of tension screws 15 are also arranged inside the steel plate inner shell 12 to cooperate with the core concrete 13 to strengthen the strength of the composite beam.

[0018] In this embodiment, the ECC shell 11 is cast by high-performance fiber reinforced concrete. The U-shaped steel plate inner shell 12 is processed into a U-shape with flanges by selecting a suitable steel plate size according to the beam section design calculation requirements. The suitable steel plate size here refers to the steel plate size that meets the requirements of the steel content ratio of the section, that is, the economy and the force. U-shaped end plates 14 are welded at both ends of the U-shaped steel plate inner shell 12, and the end plates 14 are welded to the steel plate inner shell 12; eyebolts and nuts are set at appropriate intervals on the bottom of the U-shaped steel plate inner shell 12, and the appropriate interval here means that the setting of the eyebolts meets the strength requirements of the U-shaped steel plate inner shell 12; tension screws 15 are set at appropriate intervals on both sides of the U-shaped steel plate inner shell 12, and the tension screws 15 are in the same length direction as the composite beam, and the appropriate interval here means that the setting of the tension screws 15 meets the strength requirements of the U-shaped steel plate component; embedded screws 18 are set at appropriate intervals at the flanges of the U-shaped steel plate inner shell 12, and the appropriate interval means that the setting of the embedded screws 18 meets the component strength and the connection strength with the floor slab, and the tension screws 15 are perpendicular to the embedded screws 18. High-strength screws 17 are pre-embedded at appropriate intervals on the U-shaped end plates 14 on both sides. The appropriate interval here means that the setting of the high-strength screws 17 meets the requirements of the connection strength between the end plates 14. Here, the high-strength screws 17 and the pre-embedded screws 18 are used to connect with other floor slabs, and the tension screws 15 are used to strengthen the strength inside the composite beam. Further, the pre-embedded screws penetrate into the ECC shell 11.

[0019] Continue to combine Figures 1 to 3 As shown, during construction, first, according to the beam section design requirements, select the appropriate steel plate size to be processed into a U-shaped steel plate inner shell 12 with flanges; weld the U-shaped end plates 14 at both ends of the U-shaped steel plate inner shell 12; then set the eyebolts at a suitable interval on the bottom of the U-shaped steel plate inner shell 12 and lock the nuts, set the tension screws 15 on both sides of the U-shaped steel plate inner shell 12, and pre-embed the screws at a suitable interval at the flange of the U-shaped steel plate inner shell 12. Secondly, pre-embed high-strength screws 17 at a suitable interval at the U-shaped end plates 14 on both sides. Finally, support the beam sideways, pour ECC on the outside to form the ECC outer shell 11 and complete the maintenance, and finally support the formwork at the U-shaped end plates 14 at both ends, and then pour the core concrete 13 inside, wherein the internal core concrete 13 can also be cast-in-place at the installation site. Among them, it is necessary to pay attention to the connecting end plates 14 on both sides of the beam. High-strength screws 17 need to be pre-embedded in the end plates 14 on both sides. On the beam end end plates 14 connecting the beam-column assembly, it is necessary to pay attention to pre-embed screws 18 at the flange of the upper steel plate of the beam to connect the beam to the floor slab.

[0020] The novel prefabricated ECC-steel plate-concrete composite beam member adopted in the present embodiment adopts a composite assembled connection of tension screws 15, connecting end plates 14, and eyebolts between the U-shaped steel plate inner shells 12. The tension screws 15 at the web of the beam can effectively prevent local buckling of the steel plate and enhance stability. At the same time, the tension screws 15 can provide binding force for the beam, replacing the role of stirrups to a certain extent, and effectively reducing the amount of steel bars used; at the same time, the eyebolts at the bottom of the steel beam play a role in transmitting shear force. The eyebolts can be staggered with the steel fibers in the ECC outer shell 11, which can resist the relative slippage between the high-ductility fiber concrete and the steel plate inner shell 12, causing the concrete to fall off, thereby enhancing the integrity of the member; the prefabricated beam adopts high-strength screws 17 at the beam connection. The high-strength screws 17 are pre-buried in the end plates 14 on both sides of the middle beam and can be connected to the beam-column assembly. The end plate 14 at the beam end serves to connect and fix the two beams and bears the role of longitudinal reinforcement, which can effectively resist deformation and transmit force, strengthen the integrity of the connection, facilitate the connection of the two beams, and improve the portability of construction; in addition, ECC pouring is used on the outside, and ECC will improve the overall stability, ductility, and fire resistance of the beam. At the same time, it has good mechanical properties, can ensure the load transfer between beams, and has good force-bearing performance; the flange on the steel plate inner shell 12 can replace the reinforced concrete frame reinforcement or the upper concrete stress-bearing steel bar, thereby improving the integrity of the component; the use of this prefabricated component has a simple structure and convenient construction, and can easily realize the connection of the beam end of the steel plate-ECC new prefabricated composite beam and the beam-column assembly; the beam and the floor slab can be quickly connected by pre-embedded screws 18, which improves construction efficiency, strengthens the integrity of the connection between the beam and the floor slab, and better transmits force.

[0021] This embodiment improves the applicability of prefabricated ECC-steel plate-concrete composite beam components in prefabricated buildings and has broad application prospects in prefabricated and assembled buildings.

[0022] It should be understood that the above are only preferred implementations of the present utility model, and 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.

[0023] The above description of the drawings used in the implementation manner only shows certain embodiments of the utility model and 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.

Claims

1. A prefabricated ECC-steel plate-concrete composite beam, It is characterized in that include: An ECC outer shell is provided, wherein a steel plate inner shell is fixedly installed in the ECC outer shell, and core concrete is poured in the steel plate inner shell. A plurality of tension screws are also arranged inside the steel plate inner shell to cooperate with the core concrete to strengthen the strength of the composite beam.

2. The prefabricated ECC-steel plate-concrete composite beam according to claim 1, It is characterized in that At least one eye bolt is formed inside one end of the steel plate inner shell.

3. The prefabricated ECC-steel plate-concrete composite beam according to claim 1, It is characterized in that The steel plate inner shell is a U-shaped steel plate inner shell with flanges, and embedded screws perpendicular to the tension screws are installed on the flanges to facilitate the connection of the composite beam with the floor slab.

4. The prefabricated ECC-steel plate-concrete composite beam according to claim 3, It is characterized in that The embedded screw rod penetrates into the ECC shell.

5. The prefabricated ECC-steel plate-concrete composite beam according to claim 1, It is characterized in that U-shaped end plates are fixedly provided at two ends of the steel plate inner shell, and a plurality of high-strength screws having the same length direction as the composite beam are pre-embedded on the U-shaped end plates.

6. The prefabricated ECC-steel plate-concrete composite beam according to claim 5, It is characterized in that The U-shaped end plates are fixed to the two ends of the steel plate inner shell by welding.

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