T-shaped steel end anti-cracking superposed beam

Abstract

The utility model discloses a T-shaped steel end anti-cracking superposed beam which comprises a precast beam body, end section steel is pre-buried at the left end and / or the right end of the precast beam body, beam bottom bars which are horizontally arranged in the left-right direction are pre-buried at the lower portion of the precast beam body, and a plurality of precast stirrups which are evenly arranged in the left-right direction at intervals are pre-buried in the precast beam body. The lower portions of the prefabricated stirrups and the beam bottom bars are bound into a whole, cast-in-place steel bars parallel to the beam bottom bars are bound to the upper ends of all the prefabricated stirrups, the end profile steel is T-shaped steel composed of a horizontal flange plate and a vertical web, and the part, pre-buried in the prefabricated beam body, of the horizontal flange plate makes contact with the beam bottom bars and is welded to the beam bottom bars into a whole. And a plurality of anti-cracking ribs pre-embedded in the precast beam body are arranged on the upper side edges of the vertical webs. The top surface of the precast beam body is not cracked any more, the connection strength between the T-shaped steel and the precast beam body is improved, and concrete is easier to compact during cast-in-place construction of the wall beam connection joint, so that the cast-in-place quality is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of assembled buildings, and in particular relates to a T-shaped steel end anti-cracking composite beam. Background Art

[0002] The Chinese utility model patent with the authorization announcement number CN206903060U discloses a concrete composite beam with end steel. The patent has the following disadvantages and shortcomings in practical application:

[0003] 1) The end steel is I-beam (H-steel). When the I-beam is connected to the wall and the formwork is supported for pouring concrete, the upper plate of the I-beam blocks the concrete from falling smoothly, and the vibrating rod is difficult to reach the lower part for compaction, resulting in the concrete density of the node pouring not being able to meet the standard.

[0004] 2) Since there is no embedded steel bar on the top of the composite beam cast in the factory, it is easy to crack during transportation and lifting, especially the top surface of the end of the composite beam is prone to cracking.

[0005] 3) The I-beam is embedded in the composite beam and has no connection with the steel bars inside the composite beam. The bond between the I-beam and the concrete is not strong and is prone to loosening. Utility Model Content

[0006] In order to solve the deficiencies in the prior art, the utility model provides a T-shaped steel end anti-cracking composite beam which has good quality, high strength and is easy to pour and vibrate concrete after the wall beam is connected.

[0007] In order to solve the above technical problems, the utility model adopts the following technical scheme: a T-shaped steel end anti-cracking composite beam, comprising a prefabricated beam body horizontally arranged along the left and right directions in the length direction, the left and / or right ends of the prefabricated beam body are pre-embedded with end steel sections, the lower part of the prefabricated beam body is pre-embedded with beam bottom bars horizontally arranged along the left and right directions, a plurality of prefabricated stirrups evenly spaced along the left and right directions are pre-embedded in the prefabricated beam body, the lower part of the prefabricated stirrups is tied together with the beam bottom bars, the upper ends of the prefabricated stirrups extend upward from the upper surface of the prefabricated beam body, the upper ends of all the prefabricated stirrups are tied with cast-in-place steel bars parallel to the beam bottom bars, the end steel sections are T-shaped steel sections composed of horizontal flange plates and vertical web plates, the part of the horizontal flange plates embedded in the prefabricated beam body is in contact with the beam bottom bars and welded together, and the side edge of the vertical web plates is provided with a plurality of anti-cracking bars embedded in the prefabricated beam body.

[0008] The anti-cracking reinforcement includes vertical connecting reinforcement and transverse anti-cracking reinforcement arranged along the front and rear directions. The lower end of the vertical connecting reinforcement is welded to the upper side of the vertical web, the middle part of the transverse anti-cracking reinforcement is welded to the upper end of the vertical connecting reinforcement, and the front and rear ends of the transverse anti-cracking reinforcement are bent downward.

[0009] Anchor reinforcements arranged in the left-right direction and extending toward the inside of the prefabricated beam body are welded on the side edges of the vertical webs.

[0010] T-shaped anchor nails are welded on the upper surface of the horizontal flange plate and the front and rear sides of the vertical web.

[0011] A through hole which is transparent from front to back is opened on the vertical web inside the prefabricated beam body.

[0012] By adopting the above technical solution, the utility model has two structural forms: one is to embed end section steel (cantilever beam) at one end of the prefabricated beam body, and the other is to embed end section steel at both ends of the prefabricated beam body.

[0013] Compared with the prior art, the present invention has the following technical effects:

[0014] 1. The end steel is a T-steel composed of a horizontal flange plate and a vertical web. When the T-steel is connected to the wall and the formwork is supported to pour concrete, the T-steel has no upper plate to block it, so the concrete can fall smoothly and the vibrating rod can penetrate into the node for compaction, thereby ensuring that the density of the concrete poured at the node meets the standard.

[0015] 2. The part of the horizontal flange plate embedded in the prefabricated beam body is in contact with the bottom reinforcement of the beam and welded as a whole, the upper side of the vertical web is welded with anchor reinforcement arranged in the left and right direction and extending into the inside of the prefabricated beam body, and the upper surface of the horizontal flange plate and the front and rear sides of the vertical web are welded with T-shaped anchor nails, so that there is a strong connection between the T-steel and the prefabricated beam body, ensuring the firmness of the overall connection between the T-steel and the prefabricated beam body, while also improving the strength of the T-steel itself.

[0016] 3. The setting of anti-cracking reinforcement makes the anti-cracking reinforcement and the upper concrete solidify into one when pouring concrete in the factory, ensuring that the upper concrete of the precast beam will no longer crack, which not only improves the quality of the precast beam, but also further improves the connection strength between the T-steel and the precast beam.

[0017] 4. Setting of through holes: When pouring concrete for composite beams in factory construction, the concrete passes through the through holes on the vertical webs, so that the concrete on the front and rear sides of the vertical webs are connected as a whole through the through holes.

[0018] In summary, the top surface of the prefabricated beam of the utility model no longer cracks, and the connection strength between the T-steel and the prefabricated beam is improved. During on-site pouring construction of the wall-beam connection node, the concrete is easier to vibrate, thereby improving the on-site pouring quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the first embodiment of the utility model;

[0020] Figure 2 yes Figure 1 Middle AA section view;

[0021] Figure 3 It is a structural schematic diagram of the second embodiment of the utility model. DETAILED DESCRIPTION

[0022] Embodiment 1: Figure 1 and Figure 2 As shown, the T-shaped steel end anti-cracking composite beam of the utility model comprises a prefabricated beam body 1 horizontally arranged along the left and right directions in the length direction, an end steel section (cantilever beam structure) is pre-embedded at the left or right end of the prefabricated beam body 1, two beam bottom bars 2 horizontally arranged along the left and right directions are pre-embedded at the lower part of the prefabricated beam body 1, a plurality of prefabricated stirrups 3 evenly spaced along the left and right directions are pre-embedded in the prefabricated beam body 1, the lower part of the prefabricated stirrups 3 is bound as a whole with the beam bottom bars 2, the upper ends of the prefabricated stirrups 3 extend upwardly out of the upper surface of the prefabricated beam body 1, all the prefabricated stirrups 3 are bound at the upper ends with cast-in-place steel bars 4 parallel to the beam bottom bars 2, the end steel section is a T-shaped steel composed of a horizontal flange plate 5 and a vertical web 6, the part of the horizontal flange plate 5 pre-embedded in the prefabricated beam body 1 is in contact with the beam bottom bars 2 and welded as a whole, and a plurality of anti-cracking bars 7 pre-embedded in the prefabricated beam body 1 are provided on the upper side.

[0023] The anti-cracking ribs 7 include vertical connecting ribs 8 and transverse anti-cracking ribs 9 arranged along the front-to-back direction. The lower end of the vertical connecting ribs 8 is welded to the upper side of the vertical web 6, the middle part of the transverse anti-cracking ribs 9 is welded to the upper end of the vertical connecting ribs 8, and the front and rear ends of the transverse anti-cracking ribs 9 are bent downward.

[0024] Anchor reinforcement bars 10 arranged in the left-right direction and extending toward the interior of the prefabricated beam body 1 are welded to the upper side of the vertical web 6 .

[0025] T-shaped anchor nails 11 are welded to the upper surface of the horizontal flange plate 5 and the front and rear side surfaces of the vertical web plate 6 .

[0026] A through hole 12 which is transparent from front to back is opened on the vertical web 6 inside the prefabricated beam body 1 . Figure 2 The rectangular dotted frame in the figure is the cast-in-place overlapping area 13.

[0027] Compared with the prior art, the present invention has the following technical effects:

[0028] 1. The end steel is a T-steel composed of a horizontal flange plate 5 and a vertical web plate 6. When the T-steel is connected to the wall and the support formwork is used to pour concrete, the T-steel has no upper plate to block it, so the concrete can fall smoothly and the vibrating rod can penetrate into the node for compaction, thereby ensuring that the density of the concrete poured at the node meets the standard.

[0029] 2. The part of the horizontal flange plate 5 embedded in the prefabricated beam body 1 is in contact with the beam bottom reinforcement 2 and welded as a whole, the upper side of the vertical web 6 is welded with anchor reinforcement 10 arranged in the left-right direction and extending into the interior of the prefabricated beam body 1, and the upper surface of the horizontal flange plate 5 and the front and rear sides of the vertical web 6 are welded with T-shaped anchor nails 11, so that there is a strong connection between the T-shaped steel and the prefabricated beam body 1, ensuring the firmness of the overall connection between the T-shaped steel and the prefabricated beam body 1, while also improving the strength of the T-shaped steel itself.

[0030] 3. The anti-cracking ribs 7 are set so that when pouring concrete in the factory, the anti-cracking ribs 7 and the upper concrete are solidified into one, ensuring that the upper concrete of the precast beam body 1 will no longer crack, which not only improves the quality of the precast beam body 1, but also further improves the connection strength between the T-steel and the precast beam body 1.

[0031] 4. The through holes 12 are provided. When pouring concrete in the factory, the concrete passes through the through holes 12 on the vertical web 6, so that the concrete on the front and rear sides of the vertical web 6 are connected as a whole through the through holes 12.

[0032] Embodiment 2: Figure 3 As shown, the difference from the first embodiment is that end steel sections are embedded at both ends of the prefabricated beam body 1, and the structures connected to the end steel sections on the same side are arranged symmetrically.

[0033] This embodiment does not impose any formal restrictions on the shape, material, structure, etc. of the utility model. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the utility model are within the protection scope of the technical solution of the utility model.

Claims

1. T-shaped steel end anti-cracking composite beam, including a prefabricated beam body horizontally arranged in the left and right directions in the length direction, the left and / or right ends of the prefabricated beam body are pre-embedded with end steel, the lower part of the prefabricated beam body is pre-embedded with beam bottom reinforcement horizontally arranged in the left and right directions, and the prefabricated beam body is pre-embedded with a plurality of prefabricated stirrups evenly spaced along the left and right directions, the lower part of the prefabricated stirrups is tied with the beam bottom reinforcement as a whole, the upper end of the prefabricated stirrups extends upward from the upper surface of the prefabricated beam body, and the upper ends of all the prefabricated stirrups are tied with cast-in-place steel bars parallel to the beam bottom reinforcement, characterized in that: The end steel is a T-shaped steel composed of a horizontal flange plate and a vertical web plate. The part of the horizontal flange plate embedded in the prefabricated beam body is in contact with the beam bottom reinforcement and welded as a whole. The upper side of the vertical web plate is provided with a number of anti-cracking reinforcements embedded in the prefabricated beam body.

2. The T-shaped steel end anti-cracking composite beam according to claim 1, characterized in that: The anti-cracking reinforcement includes vertical connecting reinforcement and transverse anti-cracking reinforcement arranged along the front and rear directions. The lower end of the vertical connecting reinforcement is welded to the upper side of the vertical web, the middle part of the transverse anti-cracking reinforcement is welded to the upper end of the vertical connecting reinforcement, and the front and rear ends of the transverse anti-cracking reinforcement are bent downward.

3. The T-shaped steel end anti-cracking composite beam according to claim 1, characterized in that: Anchor reinforcements arranged in the left-right direction and extending toward the inside of the prefabricated beam body are welded on the side edges of the vertical webs.

4. The T-shaped steel end anti-cracking composite beam according to claim 1, characterized in that: T-shaped anchor nails are welded on the upper surface of the horizontal flange plate and the front and rear sides of the vertical web.

5. The T-shaped steel end anti-cracking composite beam according to any one of claims 1 to 4, characterized in that: A through hole which is transparent from front to back is opened on the vertical web inside the prefabricated beam body.

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