Precast beam for fabricated cross hollow beam building floor

Abstract

The utility model discloses a precast beam for an assembly type crossed hollow beam building floor, and belongs to the technical field of building structure engineering. The precast beam comprises a solid web girder main body, solid web girder overhanging longitudinal bars are arranged at the two ends of the solid web girder main body, one or two cantilever beam assemblies are arranged on the solid web girder main body at equal elevation, and when the two cantilever beam assemblies are arranged on the solid web girder main body, the two cantilever beam assemblies are symmetrically arranged on the two sides of the solid web girder main body. The solid web girder body and the cantilever beam assembly can be formed in a mold in a one-time pouring mode, the connecting joint of the cantilever beam assembly and the solid web girder body is manufactured and machined in a factory, compared with an existing prefabricated superposed beam component, the complex beam-beam connecting position is prefabricated in the factory, the quality of the structural joint can be guaranteed, the site construction progress can be accelerated, and the construction efficiency is improved. The construction efficiency is improved.

Description

Technical Field

[0001] The utility model relates to a prefabricated beam for assembled cross hollow beam building floors, belonging to the technical field of building structure engineering. Background Art

[0002] At present, the main structure of construction projects is still mainly cast-in-place, and prefabricated is relatively rare. In modern cities, the main structure of construction projects is cast-in-place. The transportation of building materials will inevitably affect the urban environment, and concrete pouring will produce noise, dust pollution and material waste. In addition, cast-in-place components require a certain amount of maintenance time before the next stage of construction can be carried out, which prolongs the construction project. In view of the above shortcomings of cast-in-place components, prefabricated components have shown incomparable advantages.

[0003] The Chinese patent document with publication number CN114382172A discloses a fully assembled building and a construction method thereof, wherein the foundation of the fully assembled building is connected to the prefabricated column by a grouting sleeve process; the floor slab overlap area is prefabricated on both sides of the prefabricated layer of the prefabricated composite beam; the prefabricated overlap support is prefabricated at the connection of the prefabricated composite beam of the prefabricated floor slab; the two ends of the prefabricated beam are respectively connected to the prefabricated column, and the beam surface reinforcement and beam structure reinforcement of the prefabricated beam are respectively extended into the top of the prefabricated column and connected with the prefabricated column. The structural steel bars of the columns are connected in a crisscross pattern; the precast floor slabs are overlapped in the floor slab overlap area of ​​the precast beams through the overlapped support, and the structural steel bars of the precast floor slabs extend into the cast-in-place layer of the precast beams and are crisscrossed with the stirrups and beam surface bars in the cast-in-place layer; the tongue and groove and post-casting strips are symmetrically arranged on the side of the joints of adjacent precast floor slabs, and additional steel bars extending into the cast-in-place layer of the adjacent precast beams are placed in the post-casting strips; the cast-in-place layer of the precast beams, the connection nodes between the precast beams and the precast columns, and the post-casting strips are cast-in-place. The production is simple and the assembly is fast.

[0004] However, the prefabricated beams in this fully prefabricated building are prefabricated composite beams, including prefabricated layers, cast-in-place layers and a steel skeleton, and the beam-beam nodes are connected at the construction site, and then the concrete is cast again at the joints. However, the nodes are often more complicated, not only with dense steel bars, but also difficult to operate on site, making it difficult to ensure quality and slowing down the construction progress. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a prefabricated beam for assembled cross hollow beam building floors.

[0006] The utility model is realized through the following technical solutions:

[0007] A prefabricated beam for assembled cross hollow beam building floors, the prefabricated beam comprising a solid beam body, both ends of the solid beam body are provided with solid beam outwardly extending longitudinal reinforcements, one or two groups of suspension beam components are provided at the same elevation on the solid beam body, and when two groups of suspension beam components are provided on the solid beam body, the two groups of suspension beam components are symmetrically arranged on both sides of the solid beam body.

[0008] The suspension beam assembly includes two lower suspension beams A and two upper suspension beams A. The two lower suspension beams A are arranged side by side and at the same elevation, and one end of the two lower suspension beams A is connected to the same side of the solid beam body. The two upper suspension beams A are arranged side by side and at the same elevation, and one end of the two upper suspension beams A is connected to the solid beam body, and the two upper suspension beams A are arranged one by one directly above the two lower suspension beams A.

[0009] The free ends of the two lower suspension beams A are both provided with lower suspension beam outwardly extending longitudinal reinforcement A, and the free ends of the two upper suspension beams A are both provided with upper suspension beam outwardly extending longitudinal reinforcement A.

[0010] The free ends of the extended longitudinal bars of the solid beam, the extended longitudinal bars A of the upper cantilever beam and the extended longitudinal bars A of the lower cantilever beam are all provided with external threads.

[0011] The top surface of the upper suspension beam A is coplanar with the top surface of the solid beam body, and the bottom surface of the lower suspension beam A is coplanar or non-coplanar with the bottom surface of the solid beam body.

[0012] The top surface of the solid beam body and the top surface of the upper cantilever beam A are both pre-embedded with beam-slab connecting reinforcements B.

[0013] The exposed portion of the beam-slab connecting rib B is in an inverted V shape.

[0014] The exposed height of the beam-slab connecting reinforcement B differs from the thickness of the cast-in-place floor slab by the thickness of the concrete protective layer.

[0015] The beneficial effects of the utility model are:

[0016] The solid beam body and cantilever beam assembly can be cast in the mold at one time. The connection nodes between the cantilever beam assembly and the solid beam body are manufactured and processed in the factory. Compared with the existing prefabricated composite beam components, the complex beam-beam connections are included in the factory prefabrication, which can not only ensure the quality of the structural nodes, but also speed up the on-site construction progress and improve construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0018] Figure 2 It is a structural diagram of a prefabricated cross hollow beam building floor;

[0019] Figure 3 This is a schematic diagram of the structure of the center column of a prefabricated cross hollow beam building floor.

[0020] In the figure: 1-column, 112-precast solid beam, 113-extending longitudinal reinforcement of solid beam, 2-precast beam, 20-solid beam body, 200-extending longitudinal reinforcement of solid beam, 21-cantilever beam assembly, 210-lower cantilever beam A, 211-upper cantilever beam A, 212-extending longitudinal reinforcement A of lower cantilever beam, 213-extending longitudinal reinforcement A of upper cantilever beam, 22-beam-slab connecting reinforcement B, 3-cross hollow grid beam. DETAILED DESCRIPTION

[0021] The technical solution of the utility model is further described below, but the scope of protection required is not limited to the description.

[0022] like Figures 1 to 3 As shown, the utility model discloses a prefabricated beam for assembled cross hollow beam building floors, wherein the prefabricated beam 2 comprises a solid beam body 20, and both ends of the solid beam body 20 are provided with solid beam outwardly extending longitudinal reinforcements 200, and one or two groups of suspension beam components 21 are provided at the same elevation on the solid beam body 20, and when two groups of suspension beam components 21 are provided on the solid beam body 20, the two groups of suspension beam components 21 are symmetrically arranged on both sides of the solid beam body 20. Figure 1 As shown, when a set of suspension beam components 21 is provided at the same elevation on the solid beam body 20, the precast beam 2 is used as a side beam; when two sets of suspension beam components 21 are provided at the same elevation on the solid beam body 20, the precast beam 2 is used as a middle beam (not shown in the figure), and both sides of the middle beam are equipped with cross hollow grid beams 3. The solid beam outwardly extending longitudinal reinforcement 200 is connected to the precast solid beam outwardly extending longitudinal reinforcement 113 on the column 1 through a sleeve, and then the connection section between the solid beam body 20 and the solid beam 112 is cast in situ to realize the integral connection between the precast beam 2 and the column 1. The suspension beam component 21 is used to connect with the cross hollow grid beam 3.

[0023] The solid beam body 20 and the suspension beam assembly 21 can be cast in a mold at one time. The connection nodes between the suspension beam assembly 21 and the solid beam body 20 are manufactured and processed in the factory. Compared with the existing prefabricated composite beam components, the complex beam-beam connections are included in the factory prefabrication, which can not only ensure the quality of the structural nodes, but also speed up the on-site construction progress and improve the construction efficiency.

[0024] The suspension beam assembly 21 includes two lower suspension beams A210 and two upper suspension beams A211. The two lower suspension beams A210 are arranged side by side and at the same elevation, and one end of the two lower suspension beams A210 is connected to the same side of the solid beam body 20. The two upper suspension beams A211 are arranged side by side and at the same elevation, and one end of the two upper suspension beams A211 is connected to the solid beam body 20, and the two upper suspension beams A211 are arranged one by one directly above the two lower suspension beams A210. The solid beam body 20, the lower suspension beam A210 and the upper suspension beam A211 can be cast and formed in a mold at one time. The upper suspension beam A211, the lower suspension beam A210 and the connection nodes with the solid beam body 20 are manufactured and processed in the factory. Compared with traditional concrete prefabricated components, the complex beam-beam connection is included in the factory prefabrication, which can not only ensure the quality of the structural nodes, but also save resources and reduce the cost.

[0025] The free ends of the two lower suspension beams A210 are provided with lower suspension beam outward longitudinal reinforcement A212, and the free ends of the two upper suspension beams A211 are provided with upper suspension beam outward longitudinal reinforcement A213. The lower suspension beam outward longitudinal reinforcement A212 and the upper suspension beam outward longitudinal reinforcement A213 are mechanically connected to the stress-bearing steel bars on the cross hollow grid beam 3 through sleeves.

[0026] The free ends of the solid beam extended longitudinal reinforcement 200, the upper suspension beam extended longitudinal reinforcement A213 and the lower suspension beam extended longitudinal reinforcement A212 are all provided with external threads. The solid beam extended longitudinal reinforcement 200, the lower suspension beam extended longitudinal reinforcement A212 and the upper suspension beam extended longitudinal reinforcement A213 are all stress-bearing steel bars. The length of the external threads at the free ends of the solid beam extended longitudinal reinforcement 200, the upper suspension beam extended longitudinal reinforcement A213 and the lower suspension beam extended longitudinal reinforcement A212 is determined according to the load shared by the components.

[0027] The top surface of the upper suspension beam A211 is coplanar with the top surface of the solid beam body 20, and the bottom surface of the lower suspension beam A210 is coplanar or non-coplanar with the bottom surface of the solid beam body 20.

[0028] The top surface of the solid beam body 20 and the top surface of the upper suspension beam A211 are both pre-embedded with beam-slab connecting ribs B22.

[0029] The exposed portion of the beam-slab connecting rib B22 is in an inverted V shape.

[0030] The exposed height of the beam-slab connecting reinforcement B22 differs from the thickness of the cast-in-place floor slab by the thickness of the concrete protective layer.

[0031] The beam-slab connecting ribs B22 are located in the middle of the width direction of the top surface of the solid beam body 20, and are arranged at equal intervals along the length direction of the solid beam body 20; the beam-slab connecting ribs B22 are located in the middle of the width direction of the top surface of the upper suspension beam A211, and are arranged at equal intervals along the length direction of the solid beam body 20. The beam-slab connecting ribs B22 are pre-buried in the top of the solid beam body 20 and the upper suspension beam A211, which is convenient for quickly identifying the position of the precast beam 2, and convenient for on-site hoisting of the precast beam 2. It can also connect the solid beam body 20, the upper suspension beam A211 and the cast-in-place floor slab as a whole, which can improve the construction speed, shorten the construction period and reduce the construction cost.

Claims

1. A prefabricated beam for a floor of an assembled cross hollow beam building, characterized in that: The prefabricated beam (2) comprises a solid beam body (20), and both ends of the solid beam body (20) are provided with solid beam externally extending longitudinal reinforcements (200), and one or two groups of suspension beam components (21) are provided at the same elevation on the solid beam body (20), and when two groups of suspension beam components (21) are provided on the solid beam body (20), the two groups of suspension beam components (21) are symmetrically arranged on both sides of the solid beam body (20).

2. The prefabricated beam for assembled cross hollow beam building floors according to claim 1, characterized in that: The suspension beam assembly (21) comprises two lower suspension beams A (210) and two upper suspension beams A (211); the two lower suspension beams A (210) are arranged side by side and at the same elevation, and one end of the two lower suspension beams A (210) is connected to the same side of the solid beam body (20); the two upper suspension beams A (211) are arranged side by side and at the same elevation, one end of the two upper suspension beams A (211) is connected to the solid beam body (20), and the two upper suspension beams A (211) are arranged one by one directly above the two lower suspension beams A (210).

3. The prefabricated beam for assembled cross hollow beam building floors according to claim 2, characterized in that: The free ends of the two lower suspension beams A (210) are both provided with lower suspension beam outwardly extending longitudinal reinforcements A (212), and the free ends of the two upper suspension beams A (211) are both provided with upper suspension beam outwardly extending longitudinal reinforcements A (213).

4. The prefabricated beam for assembled cross hollow beam building floors as claimed in claim 3, characterized in that: The free ends of the solid beam outwardly extending longitudinal reinforcement (200), the upper suspension beam outwardly extending longitudinal reinforcement A (213) and the lower suspension beam outwardly extending longitudinal reinforcement A (212) are all provided with external threads.

5. The prefabricated beam for assembled cross hollow beam building floors according to claim 2, characterized in that: The top surface of the upper suspension beam A (211) is coplanar with the top surface of the solid beam body (20), and the bottom surface of the lower suspension beam A (210) is coplanar or non-coplanar with the bottom surface of the solid beam body (20).

6. The prefabricated beam for assembled cross hollow beam building floors as claimed in claim 2, characterized in that: The top surface of the solid beam body (20) and the top surface of the upper suspension beam A (211) are both pre-embedded with beam-slab connecting ribs B (22).

7. The prefabricated beam for assembled cross hollow beam building floors according to claim 6, characterized in that: The exposed portion of the beam-slab connecting rib B (22) is in an inverted V shape.

8. The prefabricated beam for assembled cross hollow beam building floors according to claim 6, characterized in that: The difference between the exposed height of the beam-slab connecting reinforcement B (22) and the thickness of the cast-in-place floor slab is the thickness of the concrete cover.

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