CN105839846A - Prefabricated reinforced concrete composite beam - Google Patents

Abstract

A prefabricated reinforced concrete composite beam relates to a reinforced concrete composite beam. The invention solves the problems of disconnected interface existing in the connection between the existing prefabricated beams and columns, large force transmission and stress at the connection node and long construction period. The beam section and the column section of the prefabricated reinforced concrete beam-column joint are made by integral casting. The longitudinal reinforcement located at the lower part of the beam is pre-embedded along the length direction of the prefabricated beam. The longitudinal reinforcement located at the upper part of the beam needs to be laid after the pre-embedded steel connector is installed and binding, a plurality of hoops are pre-embedded on the prefabricated beam sequentially along the length direction of the prefabricated beam, the upper parts of the multiple hoops are exposed on the two top platforms of the prefabricated beam, and a prefabricated hoop is embedded at both ends of the prefabricated beam respectively. Embedded steel connectors, the pre-embedded steel connectors at both ends of the prefabricated beam and the prefabricated reinforced concrete beam-column joints are fixed by high-strength bolts, and the beam sections of the prefabricated beams and the prefabricated reinforced concrete beam-column joints form a complete reinforced concrete superposition through secondary pouring beam. The invention is used for building structural beams.

Description

Prefabricated reinforced concrete composite beam

technical field

The invention relates to a building structure beam, in particular to a prefabricated assembled reinforced concrete composite beam.

Background technique

The prefabricated concrete structure is a concrete structure made of prefabricated components as the main force-bearing components and connected by assembly. Its good product quality, high production efficiency, superior environmental benefits and other advantages make it widely used in the world, and gradually become one of the important directions for the development of building structures in our country. In the prefabricated concrete structure system currently used, the beam and column components are prefabricated in the factory, and the beam and column connections are cast on site. The connection part of the prefabricated beam is very close to the two ends of the beam span. The above-mentioned structure has the following disadvantages: 1. The concrete at the connection part of the prefabricated beam needs to wait for the joint concrete to reach the specified strength before subsequent construction can be carried out, which delays the construction period and the pouring The quality is poor compared with the pouring quality of the factory; Second, due to the disconnected interface between the prefabricated beams and columns, it is not conducive to the force transmission at the connection nodes. In order to ensure the rigid connection of beams and columns, strengthening measures need to be taken separately, which increases the difficulty of design and construction.

To sum up, the existing prefabricated beams and columns have disconnected interfaces, the force transmission and stress at the connection nodes are relatively large, and the construction period is long.

Contents of the invention

The invention aims to solve the problems of disconnected interfaces in the connection between existing prefabricated beams and columns, large force transmission and stress at connection nodes and long construction period, and further provides a prefabricated assembled reinforced concrete composite beam.

The technical scheme that the present invention takes for solving the problems of the technologies described above is:

The prefabricated assembled reinforced concrete composite beam of the present invention comprises a prefabricated beam, a pre-embedded steel connector, a plurality of longitudinal steel bars, a plurality of hoops and two prefabricated reinforced concrete beam-column nodes, and the beam sections of the prefabricated reinforced concrete beam-column nodes are connected to The column section is cast in one piece. The longitudinal reinforcement located at the lower part of the beam is embedded along the length direction of the prefabricated beam. The longitudinal reinforcement located at the upper part of the beam needs to be laid and bound after the installation of the embedded steel connectors. The length direction of the beam is pre-embedded on the prefabricated beam sequentially. The upper parts of multiple hoops are exposed on the two top platforms of the prefabricated beam. A pre-embedded steel connector is pre-embedded at both ends of the prefabricated beam. The pre-embedded steel connectors and prefabricated reinforced concrete beam-column joints are fixed by high-strength bolts, and the beam sections of prefabricated beams and prefabricated reinforced concrete beam-column joints form a complete reinforced concrete composite beam through secondary pouring.

Compared with the prior art, the present invention has the following beneficial effects:

The prefabricated assembled reinforced concrete composite beam of the present invention forms a complete reinforced concrete composite beam through the secondary pouring of the beam section of the prefabricated beam and the prefabricated reinforced concrete beam-column joint, compared with the existing reinforced concrete beam directly connected to the column , the connection position of prefabricated beam and prefabricated joint is less stressed, and the joint position is close to the inflection point under the combination of seismic action, avoiding the beam-column joint area with more complicated stress, so the working performance of the component itself and the seismic performance of the structure are easy to guarantee;

The hoisting of the prefabricated beam of the present invention can realize unsupported construction with high construction efficiency and low cost; the prefabricated beam of the present invention can be quickly positioned and installed through two pre-embedded steel connectors, and can be used as a support to install prefabricated laminated panels after installation Or prefabricated walls and other components, prefabricated beams and prefabricated laminated panels do not need additional support during the whole construction process;

The present invention has less on-site wet work, can greatly reduce manual operations and the impact on the environment, and has high mechanization degree in production and installation of products, good quality, high efficiency and good economy.

Description of drawings

Fig. 1 is the overall structure perspective view of prefabricated assembly type reinforced concrete composite beam of the present invention;

Fig. 2 is the overall structural assembly schematic diagram of the prefabricated assembled reinforced concrete composite beam of the present invention;

Fig. 3 is a perspective view of the prefabricated beam 1 in Embodiment 1 of the present invention;

Fig. 4 is the main sectional view of Fig. 3;

Fig. 5 is the left view of Fig. 3;

Fig. 6 is a perspective view of a joint between a reinforced concrete column and a prefabricated reinforced concrete beam-column in Embodiment 1 of the present invention.

detailed description

Specific Embodiment 1: As shown in Figures 1 to 6, the prefabricated reinforced concrete composite beam of this embodiment includes a prefabricated beam 1, a pre-embedded steel connector 2, a plurality of longitudinal reinforcement bars 3, a plurality of hoops 4 and two A prefabricated reinforced concrete beam-column joint, the beam section and the column section of the prefabricated reinforced concrete beam-column joint are made by integral casting, the longitudinal reinforcement 3 located at the lower part of the beam is pre-buried along the length direction of the prefabricated beam 1, and the longitudinal reinforcement 3 located at the upper part of the beam needs to be After the installation of the pre-embedded steel connector 2 is completed, laying and binding are carried out. A plurality of hoops 4 are pre-embedded on the precast beam 1 in sequence along the length direction of the prefabricated beam 1, and the upper parts of the plurality of hoops 4 are exposed on the prefabricated beam 1. On the two top platforms 1-2, a pre-embedded steel connector 2 is pre-embedded at both ends of the prefabricated beam 1. Next, the prefabricated beam 1 and the beam section of the prefabricated reinforced concrete beam-column joint form a complete reinforced concrete composite beam through secondary pouring.

When the prefabricated beam 1 is hoisted, after the steel connection is aligned and corrected, it sinks in place, and the high-strength bolts are connected to bear the construction load, and subsequent construction does not need support.

The prefabricated reinforced concrete beam-column joints referred to in the present invention are prefabricated as a whole in the factory, and the prefabricated beam 1 is prefabricated and processed in the factory. The prefabricated beams and the prefabricated joints are spliced through the pre-embedded T-shaped steel in the beams and fixed with high-strength bolts to bear the construction load. Then connect the longitudinal bars of the beam; form a complete reinforced concrete beam after the section steel connection, longitudinal bar connection and secondary pouring are completed; when the prefabricated node of the present invention is made in the factory, only the longitudinal bars and stirrups at the bottom of the beam are bound to form a reinforced skeleton, and the upper part of the beam The longitudinal reinforcement is left to be threaded and connected on site; T-shaped steel is buried at the end of the beam and the formwork is supported, and then concrete is poured to form a prefabricated beam; after transported to the construction site, it is positioned and installed through the steel joint and the prefabricated joint, and then the mechanical joint is used Connect the longitudinal reinforcement of the beam, and then install the prefabricated floor slab on the prefabricated beam that has been installed; finally, perform the secondary pouring of the connecting joint and the laminated slab to complete the construction of the beam slab on this floor.

Specific embodiment two: As shown in Figures 1 to 5, the concrete bottom surface of the prefabricated beam 1 in this embodiment is flat, and the top surface is made into an occlusal groove 1-1 and two top platforms 1-2 along its length direction. 1-1 has a zigzag bottom surface. In this design, the contact area is increased to facilitate the secondary pouring of concrete at the occlusal joint, and the two top platforms 1-2 are respectively used to support the prefabricated floor slab. Other components and connections are the same as those in the first embodiment.

Specific Embodiment Three: As shown in Fig. 3 and Fig. 4 , the two ends of the prefabricated beam 1 in this embodiment are made in zigzag shape. With such a design, the contact area is increased so as to facilitate the secondary pouring of concrete at the occlusal joint, and the other components and connection relations are the same as those in the first or second embodiment.

Embodiment 4: As shown in Fig. 3, Fig. 4 and Fig. 5, the embedded steel connector 2 of this embodiment includes the pre-embedded part 2-1 of the shaped steel and the exposed web 2-2, and the pre-embedded part 2-1 of the shaped steel The cross section is in an inverted "T" shape, and a plurality of connecting bolt holes are processed on the exposed web 2-2.

Specific implementation mode five: as shown in Figure 6, the length of the prefabricated beam 1 in this embodiment is 1/3 to 1/2 of the distance between adjacent columns, and the connection between the prefabricated beam 1 and the prefabricated reinforced concrete beam-column node is close to the designed inflection point Location. Such a design avoids the direct connection between the end of the prefabricated beam and the column, and transfers the connection position to the part with less stress. Other components and connection relations are the same as those in Embodiment 1, 2 or 4.

Production process:

In conjunction with Fig. 1～6, illustrate the manufacturing process of the present invention: the present invention corresponds to the prefabricated reinforced concrete beam, as shown in Figure 3, the making of prefabricated beam 1 of the present invention is finished in the prefabricated component factory, comprises longitudinal steel bar 3 and stirrup 4 binding, Embedded steel connectors 2, formwork support, concrete pouring and maintenance.

The specific production process is as follows:

1. Bind the steel skeleton, adjust the position of the longitudinal steel bar 3 and stirrup 4 and check the binding quality; 2. Embed steel connectors 2, pre-embed two pre-embedded steel connectors 2 at the end of the beam section; 3. Support according to the design requirements Formwork, pouring concrete and curing under standard conditions. When the construction period is tight, you can choose special conditions for curing, such as high-temperature steam curing; 4. After the curing is completed, the formwork is removed after the test reaches the design standard strength, and the beam is completed. Then it is shipped to Construction site yard, waiting for hoisting;

The installation and construction of the prefabricated beam 1 of the present invention is shown in Figure 2: the prefabricated beam 1 is connected by a tower crane. Use hoisting equipment to fine-tune the plane position, vertical verticality and elevation of the point. After the adjustment is completed, the sinking connection is fixed, the upper longitudinal reinforcement of the prefabricated beam is pierced, and the longitudinal reinforcement 3 and the stirrup 4 at the connection are tied. The connection of the beam longitudinal reinforcement 3 is carried out by means of mechanical joints. After the prefabricated beams are connected, a beam-column frame system is formed, and this system is used as a support to overlap the precast concrete laminated slabs of this layer. Set up the formwork at the beam connection and pour concrete integrally with the floor, and remove the support of this floor after curing to the specified strength to complete the construction of this floor.

Claims (5)

1. a prefabricated assembling type reinforced concrete composite beam, described Reinforced Concrete Composite Beams includes precast beam (1), pre-buried Steel fastener (2), multiple longitudinal reinforcement (3), multiple muscle hoop (4) and two precast reinforced concrete beam Column border node, it is special Levy and be: the beam section of precast reinforced concrete beam Column border node is made with shell of column one cast, is positioned at the longitudinal reinforcement (3) of beam bottom Pre-buried along the length direction of precast beam (1), the longitudinal reinforcement (3) being positioned at beam top need to treat that pre-buried steel connector (2) is installed Carrying out after completing laying and colligation, multiple muscle hoops (4) are embedded in precast beam (1) successively along the length direction of precast beam (1) again On, the top of multiple muscle hoops (4) is exposed on two end face platforms (1-2) of precast beam (1), precast beam (1) Two ends are embedded with a pre-buried steel connector (2) respectively, and the pre-buried structural steel connecting member (2) at precast beam (1) two ends is with prefabricated Reinforced concrete beam column node is affixed by high-strength bolt, and precast beam (1) leads to the beam section of precast reinforced concrete beam Column border node Cross secondary and pour the Reinforced Concrete Composite Beams that formation is complete.

Prefabricated assembling type reinforced concrete composite beam the most according to claim 1, it is characterised in that: precast beam (1) Concrete bottom smooth, end face is fabricated to occlusal crib (1-1) and two end face platforms (1-2) along its length, occlusion The bottom surface of groove (1-1) is zigzag.

Prefabricated assembling type reinforced concrete composite beam the most according to claim 1 and 2, it is characterised in that: precast beam (1) Concrete two ends be zigzag.

Prefabricated assembling type reinforced concrete composite beam the most according to claim 3, it is characterised in that: pre-buried steel connector (2) including the pre-buried part of shaped steel (2-1) and expose web (2-2), the cross section of the pre-buried part of shaped steel (2-1) is inverted " t " Font, exposes and is machined with multiple link bolt hole on web (2-2).

5. according to the prefabricated assembling type reinforced concrete composite beam described in claim 1,2 or 4, it is characterised in that: prefabricated The 1/3～1/2 of a length of Reinforced Concrete Composite Beams span of beam (1).