CN217128504U - The connection structure of the prefabricated reinforced concrete main beam and the secondary beam - Google Patents

Abstract

The utility model discloses a connection structure of assembled reinforced concrete girder and secondary beam, including two prefabricated girders, be equipped with prefabricated secondary beam between two prefabricated girders, be equipped with prefabricated girder post-cast section concrete on the prefabricated girder, be equipped with prefabricated secondary beam post-cast section concrete above the prefabricated secondary beam, be equipped with on the prefabricated girder and link up the trompil, prefabricated secondary beam both ends are equipped with the bottom reinforcing bar; post-cast concrete is arranged in the through hole. The utility model has the characteristics of can effectively reduce the construction degree of difficulty.

Description

The connection structure of the prefabricated reinforced concrete main beam and the secondary beam

technical field

The utility model relates to a connection structure between a main beam and a secondary beam, in particular to a connection structure of an assembled reinforced concrete main beam and a secondary beam.

Background technique

Regarding the connection of the prefabricated reinforced concrete prefabricated main beam and the prefabricated secondary beam, there are four usual methods: 1) Reserve a back pouring groove at the prefabricated main beam, and complete the connection between the main and secondary beams through the on-site pouring of concrete in the post pouring groove. , The disadvantage of this approach is that the gap on the main beam is the weak part of the main beam, which is prone to damage during transportation and hoisting, affecting the bearing capacity of the main beam, and the technical reliability is not high.

2) The post-casting section is set at the end of the secondary beam, which can be divided into lap joint, welding and grouting sleeve connection according to the connection form of the steel bars at the bottom of the secondary beam. The post-casting section connection method at the end of the secondary beam can effectively ensure the integrity of the main beam, and the process cost is low, but the construction of the steel bar connection at the bottom of the secondary beam is difficult, and the reserved straight threads of the main beam are easily polluted in the prefabrication process, resulting in the failure of the steel bar. It is screwed in, and the sleeve cannot be staggered because the joints cannot be staggered. It needs to reach the first-level joints. It is difficult to meet the requirements on the construction site. The lap joint of reserved steel bars for the main beam will cause great inconvenience during the production and transportation of components.

3) The connection of shelving prefabricated primary and secondary beams can be divided into steel corbels and concrete corbels according to the form of corbels. The integrity and durability of concrete corbels are good, but the production of components is difficult, and the reinforcement of corbels needs to be considered separately. Design and demolding are difficult. Compared with concrete corbels, steel corbels are easier to produce components, but steel corbels have poor fire resistance, are easy to corrode, have poor durability, and the quality of large-scale on-site welding is at risk, and weld inspection also affects on-site progress.

4) The connection node of the ox-tank plate. Although the grouting operation is carried out for the joint of the ox-tank plate, it does not involve concrete pouring. The integrity of the primary and secondary beams is good, and the construction convenience is high. However, due to the complex structure of the corresponding primary and secondary beams, it involves embedded parts. , Indwelling the notch of the oxtan board, and the notch of the secondary beam, etc., the production of components is difficult.

The above four methods all have the problem of difficult construction.

Utility model content

The purpose of the utility model is to provide a connection structure of a prefabricated reinforced concrete main beam and a secondary beam. The utility model has the characteristics that the construction difficulty can be effectively reduced.

The technical scheme of the utility model: the connection structure of the prefabricated reinforced concrete main beam and the secondary beam includes two prefabricated main beams, a prefabricated secondary beam is arranged between the two prefabricated main beams, and the prefabricated main beam is provided with a prefabricated main beam. The concrete of the post-cast section of the beam, the post-cast section of the precast secondary beam is provided above the precast secondary beam, the precast main beam is provided with through openings, and the two ends of the prefabricated secondary beam are provided with bottom steel bars located in the through openings; The hole is provided with post-cast concrete.

In the aforementioned connection structure of the prefabricated reinforced concrete main beam and the secondary beam, the through holes are bidirectional quadrangular pyramid holes or rectangular square holes.

In the connection structure between the prefabricated reinforced concrete main beam and the secondary beam, the prefabricated main beam includes a prefabricated main beam body, the upper end of the prefabricated main beam body and the interior of the main body are provided with prefabricated main beam stirrups, and the prefabricated main beam stirrups are provided on the prefabricated main beam stirrups. The top reinforcement of the precast main girder in the post-cast section is provided.

In the connection structure between the prefabricated reinforced concrete main beam and the secondary beam, the prefabricated secondary beam includes a prefabricated secondary beam main body, the upper end and the interior of the prefabricated secondary beam main body are provided with prefabricated secondary beam stirrups, and the prefabricated secondary beam stirrups are provided on top of the prefabricated secondary beam stirrups. There are precast secondary beam top reinforcement bars in the post-cast section, and post-cast section secondary beam stirrups are also arranged between the post-cast section precast secondary beam top reinforcement bars and the bottom reinforcement bars.

In the aforementioned connection structure of the prefabricated reinforced concrete main beam and the secondary beam, the two ends of the prefabricated secondary beam are further provided with anti-shear notches.

Compared with the prior art, in the present invention, through holes are arranged on the prefabricated main beams, and the bottom steel bars of the prefabricated secondary beams directly extend into the through holes of the prefabricated main beams, which effectively avoids the overlapping of the steel bars in the post-casting section. There is no need to use a sleeve, which can effectively reduce the construction difficulty and construction cost, and increase the convenience of construction; it also effectively integrates the advantages of the main beam reserved post-grouting form and the secondary beam section post-casting form. At the same time, the utility model can reduce the length of the post-casting section of the secondary beam end, which conforms to the idea of building industrialization and is beneficial to the implementation of energy saving, environmental protection and green building. To sum up, the utility model has the characteristics of being able to effectively reduce the difficulty of construction.

Description of drawings

Fig. 1 is the structural representation of the present utility model;

Figure 2 is a structural view of a prefabricated secondary beam;

Figure 3 is a structural view of a prefabricated main beam;

Figure 4 is a structural view of a through hole;

Fig. 5 is the installation view of step B;

Fig. 6 is the installation view of step C;

Fig. 7 is the installation view of step D;

FIG. 8 is an installation view of step E. FIG.

The symbols in the accompanying drawings are: 1- prefabricated main beam, 2- prefabricated secondary beam, 3- post-cast concrete of pre-cast main beam, 4- post-cast concrete of pre-cast secondary beam, 5- through hole, 6- bottom reinforcement, 7-Post-cast concrete, 101-Precast main beam body, 102-Precast main beam stirrups, 103-Post-cast section precast main beam top reinforcement, 201-Precast secondary beam main body, 202-Precast secondary beam stirrups, 203-After The top reinforcement of the precast secondary beam in the pouring section, and the stirrups of the secondary beam in the 204-post-casting section.

Detailed ways

The present utility model will be further described below in conjunction with the accompanying drawings and embodiments, but not as a basis for limiting the present utility model.

Example. The connection structure of the prefabricated reinforced concrete main beam and the secondary beam, as shown in Figures 1 to 8, includes two prefabricated main beams 1, and a prefabricated secondary beam 2 is arranged between the two prefabricated main beams 1. The prefabricated main beams 1 Beam 1 is provided with precast main beam post-cast section concrete 3, precast secondary beam post-cast section concrete 4 is provided above precast secondary beam 2, precast primary beam 1 is provided with through holes 5, and both ends of precast secondary beam 2 are provided. There is a bottom steel bar 6 located in the through hole 5 ; the through hole 5 is provided with post-cast concrete 7 .

The through holes 5 are bidirectional quadrangular pyramid holes or rectangular square holes.

The two-way quadrangular pyramid opening or rectangular square hole is formed by corresponding template

The prefabricated main girder 1 includes a prefabricated main girder body 101, the upper end of the prefabricated main girder body 101 and inside the body are provided with prefabricated main girder stirrups 102, and the upper end of the prefabricated main girder stirrups 102 is provided with post-cast section prefabricated main girder top steel bars 103.

The prefabricated secondary beam 2 includes a prefabricated secondary beam main body 201, the upper end and the interior of the prefabricated secondary beam main body 201 are provided with prefabricated secondary beam stirrups 202, and the prefabricated secondary beam stirrups 202 are provided with post-cast section prefabricated secondary beam top steel bars 203, Between the top steel bar 203 and the bottom steel bar 6 of the precast secondary beam in the pouring section, there is also a post-casting section secondary beam stirrup 204 .

The two ends of the prefabricated secondary beam 2 are also provided with anti-shear notches.

The construction method of the connection structure of the prefabricated reinforced concrete main beam and the secondary beam includes the following steps:

A. Hoist the prefabricated secondary beam to the top between the two prefabricated main beams. When hoisting, keep the prefabricated secondary beam in an inclined posture;

B. Insert the bottom steel bar at one end of the prefabricated secondary beam obliquely into the through hole of the prefabricated main beam;

C. Adjust the posture of the prefabricated secondary beam to a horizontal state;

D. Translate the prefabricated secondary beam to the exact position, and at the same time insert the bottom steel bar at the other end of the prefabricated secondary beam into the through hole of the other prefabricated main beam;

E. Bind the steel bars of the post-cast section of the prefabricated main beam and the prefabricated secondary beam;

F. Bind the floor reinforcement above the prefabricated main beam and the prefabricated secondary beam;

G. Pouring and curing the post-cast section of the prefabricated main beam and the prefabricated secondary beam, the floor slab and the opening through the opening.

In step A, the inclination angle α of the prefabricated secondary beam is calculated and determined according to the following formula: α=arctan(h/Ln), where h is the height of the secondary beam and Ln is the clear span of the secondary beam.

In step E, the binding of the reinforcement bars in the post-cast section includes the reinforcement bars at the top of the precast main girder in the post-cast section, the reinforcement bars at the top of the precast secondary beams in the post-cast section, and the stirrups for the secondary beams in the post-cast section.

Claims (5)

1. Assembled reinforced concrete girder and secondary beam's connection structure, including two prefabricated girder (1), be equipped with prefabricated secondary beam (2) between two prefabricated girder (1), be equipped with prefabricated girder post-cast section concrete (3) on prefabricated girder (1), prefabricated secondary beam (2) top is equipped with prefabricated secondary beam post-cast section concrete (4), its characterized in that: the prefabricated main beam (1) is provided with a through hole (5), and two ends of the prefabricated secondary beam (2) are provided with bottom steel bars (6) positioned in the through hole (5); post-cast concrete (7) is arranged in the through hole (5).

2. The assembly-type reinforced concrete main beam and secondary beam connecting structure according to claim 1, wherein: the through hole (5) is a bidirectional quadrangular pyramid hole or a rectangular square hole.

3. The assembly-type reinforced concrete main beam and secondary beam connecting structure according to claim 1, wherein: the prefabricated main beam (1) comprises a prefabricated main beam body (101), prefabricated main beam stirrups (102) are arranged at the upper end of the prefabricated main beam body (101) and inside the prefabricated main beam body, and post-cast section prefabricated main beam top steel bars (103) are arranged on the prefabricated main beam stirrups (102).

4. The assembly-type reinforced concrete main beam and secondary beam connecting structure according to claim 1, wherein: prefabricated secondary beam (2) are equipped with prefabricated secondary beam stirrup (202) including prefabricated secondary beam main part (201), prefabricated secondary beam main part (201) upper end and inside, are equipped with post-cast section prefabricated secondary beam top reinforcing bar (203) on prefabricated secondary beam stirrup (202), still are equipped with post-cast section secondary beam stirrup (204) between post-cast section prefabricated secondary beam top reinforcing bar (203) and bottom reinforcing bar (6).

5. The assembly-type reinforced concrete main beam and secondary beam connecting structure according to claim 1, wherein: and shear notches are also formed in the two ends of the prefabricated secondary beam (2).

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