CN216239244U

CN216239244U - Concrete superimposed sheet and cast-in-place roof beam connection structure

Info

Publication number: CN216239244U
Application number: CN202122899081.1U
Authority: CN
Inventors: 黄俊杰; 杨鑫蕊; 张国强
Original assignee: China State Construction Technology Hunan Co Ltd
Current assignee: China State Construction Technology Hunan Co Ltd
Priority date: 2021-11-24
Filing date: 2021-11-24
Publication date: 2022-04-08
Anticipated expiration: 2031-11-24

Abstract

The utility model provides a connecting structure of a concrete composite slab and a cast-in-place beam, which comprises the composite slab, an additional steel bar and the cast-in-place beam, wherein a plurality of notches are formed in the slab end of the composite slab, inner main bars of the composite slab are respectively positioned in the notches and do not extend out of the notches, one end of the additional steel bar is welded with the inner main bar in the notches, and the other end of the additional steel bar is inserted into the cast-in-place beam; the cross section of the notch perpendicular to the length direction of the notch is in an inverted trapezoid shape, and the peripheral surface of the notch is a rough surface. The notch is of an inverted trapezoid structure, the included angle between the inclined plane and the protective layer is 45-60 degrees, the peripheral surface is set to be a rough surface, the contact area between the post-pouring layer and the laminated slab in subsequent construction can be increased, the bonding strength of concrete of the two parts is improved, and meanwhile, the inverted trapezoid notch disperses the concentrated development of micro cracks of the laminated surface at the joint and hinders the penetration damage of local horizontal cracks of the laminated surface.

Description

Concrete superimposed sheet and cast-in-place roof beam connection structure

Technical Field

The utility model relates to the technical field of building structures, in particular to a connecting structure of a concrete composite slab and a cast-in-place beam.

Background

From on-site construction to factory manufacturing, assembly type buildings are increasingly emphasized by the building industry as a new building construction method, at present, the integral frame structures are popularized and assembled in a large range in China, the integral frame structures are mainly connected in a superposition and cast-in-place mode, and the flatness, the earthquake resistance and the leakage resistance of the buildings are improved.

The prefabricated composite slab influences all links from design to construction because of going out the muscle:

in the component design link, the design workload is increased, the design must consider the avoidance of the reinforcement and the reinforcement of the beam, the wall and the column, and the fine design workload is increased.

In the component production link, the automation degree of component production is limited, the automatic welding cannot be realized in the steel bar process, and manual operation is needed; the slab goes out muscle mould trompil, and the steel bar diameter of the board of different project, different specifications, indirect difference lead to the mould even the trompil can not standardize yet again, and the mould loss is big.

In the component mounting link, the beam main reinforcements, the stirrups and the beard reinforcements at the plate ends of the laminated slab are easy to conflict and cannot be mounted in place, and the beam main reinforcements are difficult to remove and adjust due to the influence of the stirrups or other reinforcements, so that the mounting difficulty is caused. Workers directly bend the anchoring reinforcing steel bars at one end of the laminated slab, and bend and straighten the reinforcing steel bars after the reinforcing steel bars of the cast-in-place beam are bound, so that the construction quality is reduced.

In view of the above, there is a need for a connection structure of a concrete composite slab and a cast-in-place beam to solve the problems in the prior art.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a connecting structure of a concrete composite slab and a cast-in-place beam, which aims to solve the problem that the existing composite slab is difficult to connect with the cast-in-place beam due to the fact that ribs are formed on the composite slab, and the concrete technical scheme is as follows:

a connection structure of a concrete composite slab and a cast-in-place beam comprises the composite slab, additional steel bars and the cast-in-place beam, wherein a plurality of notches are formed in the slab end of the composite slab, inner main steel bars of the composite slab are respectively positioned in the notches and do not extend out of the notches, one end of each additional steel bar is welded with the inner main steel bar in each notch, and the other end of each additional steel bar is inserted into the cast-in-place beam; the cross section of the notch perpendicular to the length direction of the notch is in an inverted trapezoid shape, and the peripheral surface of the notch is a rough surface.

Preferably, in the above technical solution, a protective layer is disposed below the notch, and the height of the notch is equal to the thickness of the laminated plate minus the thickness of the protective layer.

Preferably, in the above technical solution, the length of the short bottom side in the inverted trapezoid is twice the thickness of the protective layer.

In the above technical scheme, preferably, the included angle β between the inclined planes at the two sides of the notch and the protective layer is 45 ° to 60 °.

Preferably, in the above technical solution, the exposed length of the inner main reinforcement is equal to the specified length of the additional reinforcement welded thereto.

Preferably among the above technical scheme, interior main muscle, additional reinforcing bar and notch are the one-to-one setting.

Preferably, the section size and the stress form of each additional steel bar at the end plate on the same side of the laminated slab are the same.

Preferably, in the above technical solution, the cast-in-place beam includes a plurality of beam main reinforcements and a plurality of stirrups.

The technical scheme of the utility model has the following beneficial effects:

the connecting structure of the concrete composite slab and the cast-in-place beam avoids the problem that the reinforcing steel bar structure is deformed due to the collision of the beard ribs extending out of the slab end of the existing composite slab with the main beam ribs and the stirrups in the hoisting process. The form that no rib is arranged at the end of the laminated slab is adopted, so that the hoisting efficiency is greatly improved, and the bending of the steel bar is effectively avoided; the additional steel bars are adopted to realize the connection of the laminated slab and the cast-in-place beam, the additional steel bars can be flexibly adjusted according to the positions of the main beam ribs and the stirrups, favorable positions are selected for welding (namely the positions around the main beam ribs including the additional steel bars are changed), the assembly type structure and the joint connection quality are improved, and a firm connection structure is formed after a post-pouring layer is poured.

The notch is of an inverted trapezoidal structure, the included angle between the inclined plane and the protective layer is 45-60 degrees, the peripheral surface is set to be a rough surface, the contact area between the post-pouring layer and the laminated slab in subsequent construction can be increased, the bonding strength of concrete of the two parts is improved, and meanwhile, the inverted trapezoidal notch disperses the concentrated development of microcracks on the laminated surface of the joint and hinders the through destruction of local horizontal cracks on the laminated surface.

The cross-sectional dimension and the stress form of each additional steel bar at the end plate on the same side of the laminated slab are the same, so that the good stress performance of the steel bar welding position is ensured, and the problem that the rigidity and the bearing capacity of the lap joint are suddenly changed is solved.

In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. In the drawings:

FIG. 1 is a schematic structural view of a connection structure of a composite slab and a cast-in-place beam according to the present invention;

FIG. 2 is a schematic view of the construction of the ends of the laminated sheet of FIG. 1;

FIG. 3 is a front view of an end of the laminated sheet of FIG. 1;

the composite slab comprises 1, a laminated slab, 1.1, a notch, 1.2, a protective layer, 2, an additional steel bar, 3, an inner main bar, 4, a beam main bar, 5, a stirrup and 6, and a cast-in-place beam.

Detailed Description

In order that the utility model may be more fully understood, a more particular description of the utility model will now be rendered by reference to specific embodiments thereof that are illustrated in the appended drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model.

Example 1:

referring to fig. 1-3, a concrete composite slab and cast-in-place beam connection structure comprises a composite slab 1, an additional steel bar 2 and a cast-in-place beam 6, wherein a plurality of notches 1.1 are formed in the slab end of the composite slab 1, inner main bars 3 of the composite slab 1 are respectively positioned in the notches 1.1, and the inner main bars 3 do not extend out of the notches 1.1, namely, the slab end of the composite slab 1 is in a bar-out form; one end of the additional steel bar 2 is welded with the inner main bar 3 in the notch 1.1, and the other end is inserted into the cast-in-place beam 6; the cross section of the notch 1.1 perpendicular to the length direction is in an inverted trapezoid shape, and the peripheral surface of the notch 1.1 is a rough surface.

Referring to fig. 2 and 3, a protective layer 1.2 is arranged below the notch 1.1, and the height of the notch 1.1 is equal to the thickness of the laminated plate 1 minus the thickness of the protective layer 1.2. Preferably, the included angle beta between the inclined planes on the two sides of the notch 1.1 and the protective layer is 45-60 degrees.

Preferably, the length of the short base side in the inverted trapezoid is twice the thickness of the protective layer 1.2.

Further preferably, the exposed length of the inner main reinforcement 3 is equal to the specified length of the additional steel bar welded with the additional steel bar; the welding length of the inner main reinforcement and the additional reinforcement 2 is determined according to the size of the reinforcement and can be inquired according to industry specifications. Preferably, the length of the notch is greater than or equal to the exposed length of the inner main rib, and the exposed length of the inner main rib refers to the length of the inner main rib at the notch part.

Referring to fig. 1 and 2, the inner main bars 3, the additional bars 2 and the notches 1.1 are arranged in a one-to-one correspondence manner, that is, one inner main bar is arranged in one notch, and one inner main bar is welded with one additional bar.

Preferably, the cross-sectional dimensions and the stress forms of the additional steel bars 2 at the end plates on the same side of the laminated slab 1 are the same, so that the steel bar welding position has good stress performance, and the problem that the rigidity and the bearing capacity of the lap joint part are suddenly changed is solved.

Preferably, the cast-in-place beam 6 includes a plurality of beam main reinforcements 4 and a plurality of stirrups 5, and the concrete structure and construction process of the cast-in-place beam refer to the prior art.

After the laminated slab and the cast-in-place beam part are arranged, the post-cast layer construction can be carried out by setting the additional steel bars, and the specific construction mode of the post-cast layer refers to the prior art. The notch 1.1 adopts an inverted trapezoidal structure, the included angle between the inclined plane and the protective layer is 45-60 degrees, the peripheral surface is set to be a rough surface, the contact area of the laminated slab and the post-pouring layer is increased, the bonding strength of the two parts of concrete is improved, and meanwhile, the inverted trapezoidal notch disperses the concentrated development of the micro cracks of the laminated surface at the joint, and hinders the through destruction of the local horizontal cracks of the laminated surface.

The connecting structure of the concrete composite slab and the cast-in-place beam in the embodiment avoids the problem that the steel bar structure is deformed due to the collision of the beard bars extending out of the slab end of the existing composite slab with the main beam bars and the stirrups in the hoisting process, greatly improves the hoisting efficiency and effectively avoids the bending of the steel bars by adopting the mode that no bars are arranged at the slab end of the composite slab; the additional steel bars are adopted to realize the connection of the laminated slab and the cast-in-place beam, the additional steel bars can be flexibly adjusted according to the positions of the main beam ribs and the stirrups, favorable positions are selected for welding (namely the positions around the main beam ribs including the additional steel bars are changed), the assembly type structure and the joint connection quality are improved, and a firm connection structure is formed after a post-pouring layer is poured.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A concrete composite slab and cast-in-place beam connecting structure is characterized by comprising a composite slab (1), additional steel bars (2) and a cast-in-place beam (6), wherein a plurality of notches (1.1) are formed in the slab end of the composite slab (1), inner main steel bars (3) of the composite slab (1) are respectively positioned in the notches (1.1), the inner main steel bars (3) do not extend out of the notches (1.1), one ends of the additional steel bars (2) are welded with the inner main steel bars (3) in the notches (1.1), and the other ends of the additional steel bars are inserted into the cast-in-place beam (6); the cross section of the notch (1.1) perpendicular to the length direction is in an inverted trapezoid shape, and the peripheral surface of the notch (1.1) is a rough surface.

2. A concrete composite slab and cast-in-place beam connection construction according to claim 1, characterized in that a protective layer (1.2) is arranged below the notch (1.1), and the height of the notch (1.1) is equal to the thickness of the composite slab (1) minus the thickness of the protective layer (1.2).

3. The concrete composite slab and cast-in-place beam connecting structure according to claim 2, wherein the length of the shorter bottom side of the inverted trapezoid is twice the thickness of the protective layer (1.2).

4. The concrete composite slab and cast-in-place beam connecting structure according to claim 2, wherein the included angle β between the inclined surfaces at both sides of the notch (1.1) and the protective layer is 45-60 °.

5. A concrete composite slab and cast-in-place beam connecting structure according to claim 1, wherein the exposed length of the inner main reinforcement (3) is equal to a prescribed length to which the additional reinforcing bars are welded.

6. A concrete composite slab and cast-in-place beam connecting structure according to any one of claims 1 to 5, wherein the inner main reinforcement (3), the additional reinforcement (2) and the notch (1.1) are arranged in one-to-one correspondence.

7. A concrete composite slab and cast-in-place beam connecting structure as claimed in claim 6, wherein the sectional size and the stress form of each additional reinforcing steel bar (2) at the end plate on the same side of the composite slab (1) are the same.

8. A concrete composite slab and cast-in-place beam connecting structure according to claim 1, wherein said cast-in-place beam (6) comprises a plurality of main beam ribs (4) and a plurality of stirrups (5).