CN112324051A

CN112324051A - Steel pipe concrete truss prestressing force superposed beam

Info

Publication number: CN112324051A
Application number: CN202011406395.7A
Authority: CN
Inventors: 赵洪波; 张立琦; 施军
Original assignee: Jiangsu Wanda Construction Technology Co ltd
Current assignee: Jiangsu Wanda Construction Technology Co ltd
Priority date: 2020-12-03
Filing date: 2020-12-03
Publication date: 2021-02-05

Abstract

The invention discloses a steel tube concrete truss prestress superposed beam which is characterized by comprising steel tubes, truss web reinforcements, stirrups, concrete and prestress reinforcements, wherein the steel tube truss is composed of two truss web reinforcements and one steel tube; the steel pipe truss is characterized in that a plurality of stirrups are arranged at certain intervals, a plurality of prestressed tendons are arranged at the upper sides of the stirrups at intervals, and two or more steel pipe truss web reinforcements are respectively arranged between the prestressed tendons and the stirrups to form a steel skeleton of the superposed beam; in the assembly production process, the operation flow is simple and convenient, and the technical requirements on plant operators are not high; can be cast in situ with the board and the column to form a whole in the field construction process, avoids the problem of poor performance of the traditional fabricated building node, and has the advantages of good shock resistance and overall performance and the like.

Description

Steel pipe concrete truss prestressing force superposed beam

Technical Field

The invention relates to the technical field of building construction, in particular to a steel tube concrete truss prestress superposed 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, embedded parts are more, the standardization of the component cannot be realized, the cost of the component is high, the connection of the component is complex, the site conflict of the reinforced concrete is serious, and the like, and the site installation is particularly difficult.

Aiming at the problems, the invention provides a steel pipe truss prestressed composite beam, which adopts a factory precast concrete member, and pours concrete on site after binding reinforcing steel bars on the precast member on site to form the high-strength prestressed composite beam.

Disclosure of Invention

In order to achieve the purpose, the invention provides the following technical scheme: the steel pipe truss prestress superposed beam is characterized by comprising steel pipes, truss web reinforcements, stirrups, concrete and prestress reinforcements, wherein the steel pipe concrete truss is formed by the two truss web reinforcements and one steel pipe;

the plurality of stirrups are arranged at a certain interval, a plurality of prestressed tendons are arranged at the upper sides of the stirrups at intervals, and the two steel pipe truss web reinforcements are respectively arranged between the prestressed tendons and the stirrups to form a laminated beam steel framework.

Further, preferably, the prestressed tendons are bound with the stirrups, the stirrups and the truss web reinforcements, and the prestressed tendons and the truss web reinforcements respectively, and enough lap joint length is reserved at two ends of each prestressed tendon.

Further, preferably, concrete is poured around the steel framework of the superposed beam to form a concrete bottom plate with the thickness of 50-200 mm.

Further, preferably, the steel pipe is filled with high-strength mortar or high-strength grouting material.

Compared with the prior art, the invention has the beneficial effects that:

1. the invention replaces part of the steel bars with the pretensioned prestressing tendons, 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. according to the steel pipe concrete truss prestress superposed beam, the steel pipe concrete truss provides rigidity of members, and the steel pipe concrete truss has little or no support in construction, so that the steel pipe concrete truss prestress superposed beam has the characteristics of saving and environmental protection; the assembly and the pouring forming are carried out on site, and the construction process is partially mechanized, so that the construction period is greatly shortened.

3. Compared with the traditional precast beam, the steel tube concrete truss prestress superposed beam has the advantages of small concrete volume, light dead weight and easiness in hoisting.

4. According to the steel pipe concrete truss prestress superposed beam, the precast concrete part is thin, non-prestress reinforcements can be paved on site, the deficiency of the prestress reinforcements is supplemented, the ductility of the components is improved, and the reinforcement conflict among the precast components is avoided in the installation process, so that the problems of difficult manufacturing of precast beam nodes and poor node performance can be solved.

5. Compared with the traditional precast beam and cast-in-place beam, the steel pipe truss prestressed composite beam has the advantages that a large number of stirrups are replaced by the steel pipe of the truss, the mechanical properties of concrete, steel bars and steel pipes are fully combined, the high tensile strength of steel and the high compressive strength of concrete are exerted, and the stirrups are greatly reduced in the beam with the same volume, so that the cost of engineering can be saved.

Drawings

FIG. 1 is a schematic structural view of a steel pipe;

FIG. 2 is a schematic structural view of a truss web rib;

FIG. 3 is a schematic structural view of a steel pipe truss web rib assembly;

FIG. 4 is a schematic view of the structure of the stirrup;

FIG. 5 is a schematic structural view of a tendon;

FIG. 6 is a structural diagram of the steel skeleton assembly of the composite beam;

FIG. 7 is a schematic structural view of concrete;

FIG. 8 is a structural schematic diagram of the steel pipe truss prestressed composite beam after pouring;

in the figure: 1-a steel pipe; 2-truss web reinforcement; 3-hooping; 4-concrete; 5-prestressed tendons; 6-welding points.

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.

In this embodiment: the invention provides a technical scheme that: a steel pipe truss prestressed composite beam is characterized by comprising steel pipes 1, truss web reinforcements 2, stirrups 3, concrete 4 and prestressed reinforcements 5, wherein referring to fig. 1, 2 and 3, the steel pipe truss web reinforcements are formed by the two truss web reinforcements 2 and the steel pipe 1, the truss web reinforcements 2 are symmetrically welded on two sides of the steel pipes 1 through welding spots 6 respectively, the truss web reinforcements 2 are inclined at a certain angle by the welding spots 6, wherein the inclination angle and the size of the steel pipes are determined according to the pre-design, and the steel pipes replace the traditional stirrups in the composite beam, so that a steel bar framework is formed by the steel pipes and other steel bars, the steel bar framework bears shearing force and torque, and the generation and development of oblique cracks on the section of the beam are prevented or inhibited; referring to fig. 4, 5 and 6, a plurality of stirrups 3 are arranged at a certain interval, a plurality of prestressed tendons 5 are arranged at intervals on the upper sides of the stirrups 3, and two steel pipe truss web reinforcements are respectively arranged between the prestressed tendons 5 and the stirrups 3 to form a steel skeleton of the composite beam.

The prestressed tendons 5 and the stirrups 3, the stirrups 3 and the truss web reinforcements 2, and the prestressed tendons 5 and the truss web reinforcements 2 are respectively bound, and the prestressed tendons 5 are provided with enough lap joint lengths at two ends, so that the prestressed tendons do not displace in the later pouring process in order to fix the positions of the stirrups 3 and the steel pipe truss web reinforcements.

Referring to fig. 7 and 8, the periphery of the steel skeleton of the superposed beam is poured by concrete 4 to form a concrete bottom plate with the thickness of 50-200 mm.

High-strength mortar or high-strength grouting material filled in steel pipe

In the concrete implementation, the steel pipe truss prestressed composite beam is prefabricated in a factory and can be directly conveyed to a construction site for hoisting and fixing for secondary steel bar binding and non-prestressed steel bar binding, the steel bars of the beam and the column are avoided from the site, and can be cast in situ with a plate, a column and the like to form a whole in the site 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. The prestressed composite beam of the concrete-filled steel tube truss is characterized by comprising steel tubes (1), truss web reinforcements (2), stirrups (3), concrete (4) and prestressed reinforcements (5), wherein the steel tube truss web reinforcements are formed by the two truss web reinforcements (2) and one steel tube (1), the truss web reinforcements (2) are symmetrically welded on two sides of each steel tube (1) through welding spots (6), and the truss web reinforcements (2) are inclined at a certain angle by the welding spots (6);

a plurality of stirrup 3 arranges according to the determining deviation, and stirrup (3) upside interval arrangement has a plurality of prestressing tendons 5, and two steel pipe truss web members are located respectively and are assembled into the prefabricated component steel skeleton between prestressing tendons (5) and stirrup (3).

2. The prestressed composite beam of the concrete-filled steel tube truss according to claim 1, wherein the prestressed tendons (5) and the stirrups (3), the stirrups (3) and the truss web (2), and the prestressed tendons (5) and the truss web (2) are bound respectively, and sufficient lap joint length is left at two ends of the prestressed tendons (5).

3. The prestressed composite beam of the steel pipe concrete truss according to claim 1, wherein the steel skeleton of the composite beam is poured with concrete (4) to form a concrete bottom plate with a thickness of 50-200 mm.

4. The steel tube concrete truss prestressed composite beam according to claim 1, wherein the steel tube (1) is filled with high-strength mortar or high-strength grouting material.