CN113738021A

CN113738021A - Thin-bottom prestressed concrete composite beam

Info

Publication number: CN113738021A
Application number: CN202111130540.8A
Authority: CN
Inventors: 赵洪波; 梁起才; 施军
Original assignee: Jiangsu Wanda Construction Technology Co ltd
Current assignee: Jiangsu Wanda Construction Technology Co ltd
Priority date: 2021-09-26
Filing date: 2021-09-26
Publication date: 2021-12-03

Abstract

The invention discloses a thin-bottomed prestressed concrete composite beam, which comprises a thin concrete bottom, a prestressed longitudinal steel bar, a stirrup and a common steel bar. A straight line is equidistant. In the assembly and production process of the device of the invention, the operation process is relatively simple and convenient, and it is easy to realize factory production; in the field construction process, common steel bars are laid on the prefabricated bottom plate, and the common steel bars are anchored into the columns or beams according to the seismic specification, and then laid The prestressed longitudinal reinforcement is anchored into the column, and finally it can be connected with the slab and the column cast-in-place as a whole, avoiding the problem of poor performance of traditional prefabricated building joints, the mutual interference of prefabricated beam-column reinforcement and the lack of prestressed composite beams. The problem that ordinary steel bars are anchored into the column and does not meet the requirements of the specification has the advantages of seismic resistance and good overall performance.

Description

Thin-bottom prestressed concrete composite beam

Technical Field

The invention relates to the technical field of constructional engineering, in particular to a thin-bottom prestressed concrete composite beam.

Background

In the development of domestic assembly type buildings, most of the existing assembly type superposed beams are composed of common reinforced concrete, and in a large-span heavy load structure, because the strength of a reinforced material is low, the content of the reinforced concrete is high, the consumption of the concrete is large, the self weight of a component is large, a factory processing mold is complex, more embedded parts are arranged, the standardization of the component cannot be realized, the cost of the component is large, the connection of primary and secondary beam components and the connection structure of a beam column are complex, the on-site conflict between the prefabricated beam reinforced steel and the column reinforced steel is serious, and the on-site installation is very difficult.

Disclosure of Invention

The device adopts factory precast concrete components, and cast-in-place concrete is cast after reinforcing steel bars are bound on the precast components on site to form the high-strength prestressed composite beam.

In order to achieve the purpose, the invention provides the following technical scheme: a thin-bottom prestressed concrete composite beam comprises a concrete thin bottom, prestressed longitudinal steel bars, stirrups and common steel bars, wherein the stirrups are provided with a plurality of stirrups which are arranged at equal intervals along the same straight line, a plurality of prestressed longitudinal steel bars are arranged on the inner bottom surfaces of the stirrups at intervals, and the plurality of stirrups and the plurality of prestressed longitudinal steel bars are connected by steel bar binding, so that the plurality of stirrups and the plurality of prestressed longitudinal steel bars form a prefabricated member steel framework;

concrete is poured at the bottom of the steel skeleton of the prefabricated part to form the thin concrete bottom, the thin concrete bottom and the steel skeleton of the prefabricated part are combined to form the thin concrete bottom composite beam, and a plurality of common reinforcing steel bars which are arranged at equal intervals are bound on the inner bottom surface of the thin concrete bottom composite beam.

Preferably, the thickness of the concrete thin bottom is set to be 50-200 mm.

Further, preferably, both ends of each prestressed longitudinal steel bar penetrate through the concrete thin bottom and extend outwards to be anchored in the concrete wall, column or beam.

Further, preferably, the ordinary steel bar is arranged on the concrete thin bottom on site after the installation of the channel-type precast beam is completed. And anchored in concrete walls, columns or beams.

Further, preferably, the common steel bars are positioned in the tension area of the steel bars of the superposed beam.

Further, preferably, finished combined templates are adopted on two sides of the concrete thin bottom to serve as side molds.

Preferably, the concrete thin bottom plate surface is reinforced by steel bar truss, steel pipe truss and the like.

By adopting the technology, compared with the prior art, the invention has the following beneficial effects:

1. the device of the invention replaces part of the steel bars by the prestressed longitudinal steel bars, so that the prestressed composite beam has higher ultimate bearing capacity, deformation resistance, earthquake resistance and cracking resistance compared with the traditional cast-in-place beam.

2. The device provided by the invention provides the thin-bottom prestressed concrete composite beam, and compared with the traditional precast beam, the thin-bottom prestressed concrete composite beam has the advantages of small concrete volume, light dead weight and easiness in hoisting.

3. In the device, the precast concrete part is thin, the non-prestressed common steel bars are paved on site, the defects of prestressed longitudinal steel bars are overcome, the ductility of the components is improved, and the steel bar conflict among the prefabricated components is avoided during installation, so that the problems of difficult manufacture of precast beam nodes and poor node performance can be solved.

Drawings

FIG. 1 is a schematic view of a thin-bottomed prestressed concrete composite girder;

FIG. 2 is a structural diagram of a steel skeleton of a prefabricated member in a thin-bottomed prestressed concrete composite beam;

fig. 3 is a schematic structural diagram of a concrete thin-bottom composite beam in a thin-bottom prestressed concrete composite beam.

In the figure: 1. a concrete thin bottom; 2. prestressed longitudinal steel bars; 3. ordinary steel bars; 4. and (5) hooping.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example (b): referring to fig. 1-3, the present invention provides a technical solution: the utility model provides a thin end prestressed concrete superposed beam, its includes concrete thin end 1, prestressing force longitudinal reinforcement 2, stirrup 4 and ordinary reinforcing bar 3, its characterized in that: the stirrups 4 are provided with a plurality of stirrups 4, the stirrups 4 are arranged along the same straight line at equal intervals, a plurality of longitudinal prestressed reinforcing steel bars 2 are arranged on the inner bottom surfaces of the stirrups 4 at intervals, and the stirrups 4 and the longitudinal prestressed reinforcing steel bars 2 are connected by steel bar binding, so that the stirrups 4 and the longitudinal prestressed reinforcing steel bars 2 form a prefabricated component steel framework;

concrete is poured at the bottom of the steel skeleton of the prefabricated part to form a concrete thin bottom 1, the concrete thin bottom 1 and the steel skeleton of the prefabricated part are combined to form a concrete thin bottom superposed beam, and a plurality of common steel bars 3 which are arranged at equal intervals are bound on the inner bottom surface of the concrete thin bottom superposed beam; specifically, after the on-site components of the concrete thin-bottom composite beam are installed, the common steel bars 3 are laid on the upper surface of the concrete thin bottom 1, then the steel bars are adopted for binding, and then concrete is poured to form the complete thin-bottom prestressed concrete composite beam.

In this embodiment, the thickness of the concrete thin bottom 1 is set to be 50-200 mm.

In this embodiment, both ends of each prestressed longitudinal steel bar 2 penetrate through the concrete thin bottom 1 and extend outwards to be anchored in the concrete wall, column or beam.

In this embodiment, after the installation of the channel-type precast beam, the ordinary steel bars 3 are arranged on the concrete thin bottom 1 on site. And anchored in concrete walls, columns or beams.

In this embodiment, the common reinforcement 3 is located in the tension area of the reinforcement of the composite beam.

In this embodiment, finished composite formworks are adopted as side forms on both sides of the concrete thin bottom 1.

In this embodiment, the concrete thin bottom 1 can be reinforced by steel bar trusses, steel pipe trusses, and the like.

In specific implementation, the device can be prefabricated in a factory and can be directly conveyed to a construction site for hoisting and fixing to carry out secondary reinforcement binding, the non-prestressed common reinforcements 3 can be bound on the site, the reinforcement of the beam and the column can be avoided on the site, and the device can be cast in situ and connected with plates, columns and the like into a whole in the field construction process.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A thin-bottomed prestressed concrete composite beam comprising a thin concrete bottom (1), a prestressed longitudinal steel bar (2), a stirrup (4) and a common steel bar (3), is characterized in that: the stirrup (4) A plurality of the stirrups (4) are arranged at equal distances along the same line, and a plurality of the prestressed longitudinal steel bars are arranged at intervals on the inner bottom surface of the plurality of the stirrups (4). (2), a plurality of the stirrups (4) and a plurality of the prestressed longitudinal steel bars (2) are connected by steel bar binding, so that the plurality of the stirrups (4) and the plurality of the prestressed longitudinal bars (2) Reinforcing bars (2) constitute the steel skeleton of the prefabricated member;

The bottom of the prefabricated steel skeleton is poured with concrete to form the concrete thin bottom (1), the concrete thin bottom (1) and the prefabricated steel skeleton are combined to form a concrete thin-bottom superposed beam, and the concrete thin-bottom is The inner bottom surface of the superimposed beam is bound with a plurality of the common steel bars (3) arranged at equal intervals.

2 . The thin-bottomed trough-type prestressed concrete composite beam according to claim 1 , wherein the thickness of the thin concrete bottom ( 1 ) is set to 50-200 mm. 3 .

3. A thin-bottomed prestressed concrete composite beam according to claim 1, characterized in that: both ends of each of the prestressed longitudinal steel bars (2) pass through the thin concrete bottom (1) and Extends outward and anchors in concrete walls, columns or beams.

4. A thin-bottomed prestressed concrete composite beam according to claim 1, characterized in that: the common steel bar (3) is arranged on the concrete thin bottom (1) on site after the installation of the groove-shaped precast beam is completed. . And anchored in concrete walls, columns or beams.

5 . The thin-bottomed prestressed concrete composite beam according to claim 4 , wherein the common steel bars ( 3 ) are located in the tensile area of the steel bars of the composite beam. 6 .

6 . The thin-bottomed prestressed concrete composite beam according to claim 1 , wherein the two sides of the thin-bottomed concrete ( 1 ) use finished composite formwork as side formwork. 7 .

7 . The thin-bottomed prestressed concrete composite beam according to claim 1 , wherein the concrete thin-bottom (1) plate surface can be rigidly reinforced by steel trusses, steel pipe trusses, etc. 8 .