CN219491475U

CN219491475U - Large-span prestress PEC secondary beam

Info

Publication number: CN219491475U
Application number: CN202320762824.7U
Authority: CN
Inventors: 武涛; 赖国梁; 刘锐; 许贵传; 王彦; 边毓敏; 毕成琦
Original assignee: China Construction Third Engineering Bureau General Contracting Construction Co ltd
Current assignee: China Construction Third Engineering Bureau General Contracting Construction Co ltd
Priority date: 2023-04-07
Filing date: 2023-04-07
Publication date: 2023-08-08
Anticipated expiration: 2033-04-07

Abstract

The utility model discloses a large-span prestressed PEC secondary beam, which comprises a beam body, a steel reinforcement framework, steel strands, a tensioning end anchor, a tensioning end stiffening plate and horizontal pegs, wherein the beam body is provided with a plurality of steel reinforcement frameworks; the beam body comprises a secondary beam upper plate, a secondary beam lower plate, a first connecting plate and a second connecting plate; at least two first connecting plates are connected between the secondary beam upper plate and the secondary beam lower plate, and a mounting area is formed between the secondary beam upper plate and the secondary beam lower plate by the two first connecting plates; the second connecting plate is vertically connected to the first connecting plate; the steel reinforcement frameworks are equidistantly arranged in the installation area; the steel strands are axially arranged in the installation area and are arranged on the steel reinforcement framework; the two axial ends of the steel strand penetrate through the first connecting plate; the tensioning end anchor is proximate the first connection plate. The problem of the secondary beam bearing effect among the prior art is relatively poor, and the atress is not clear enough, and overall structure is comparatively complicated, has reduced the secondary beam bearing effect's technical is solved.

Description

Large-span prestress PEC secondary beam

Technical Field

The utility model relates to the technical field of buildings, in particular to a large-span prestressed PEC secondary beam.

Background

The secondary beam is arranged at the upper part of the main beam and mainly plays a role in transferring load; at the junction of the main beam and the secondary beam, the main beam can be regarded as a support of the secondary beam; the length of the secondary beam entering the main beam only meets the requirement of the anchoring length; the part of the cladding steel-concrete combined structure is a novel steel-concrete combined structure formed by welding steel bars or pegs in an H-shaped steel cavity and pouring concrete, and is applied to an assembled steel structure by virtue of excellent shock resistance, fireproof and corrosion resistance; however, as the width of the building structure is further enlarged, the cross section of the structural member is not controlled by the strength, but is controlled by cracks and disturbance, so that the cross section of the structural member is enlarged uniformly to meet the cracks and the disturbance, which is extremely unreasonable and uneconomical, and meanwhile, due to the existence of the coated concrete, the weight of the PEC structural member is heavier than that of the traditional steel structural member, thereby further limiting the application of the PEC structure in a large-span and large space;

to this end we propose a large span prestressed PEC secondary beam.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art, and provides a large-span prestressed PEC secondary beam, which solves the technical problems that the secondary beam in the prior art is poor in bearing effect, is not stressed clearly enough, is complex in overall structure and reduces the bearing effect.

In order to achieve the technical purpose, the utility model adopts the following technical scheme:

a large-span prestressed PEC secondary beam comprises a beam body, a steel reinforcement framework, steel strands, a tensioning end anchor, a tensioning end stiffening plate and horizontal pegs;

the beam body comprises a secondary beam upper plate, a secondary beam lower plate, a first connecting plate and a second connecting plate; at least two first connecting plates are connected between the secondary beam upper plate and the secondary beam lower plate, and a mounting area is formed between the secondary beam upper plate and the secondary beam lower plate by the two first connecting plates; the second connecting plate is vertically connected to the first connecting plate;

the steel reinforcement frameworks are equidistantly arranged in the installation area; the steel strands are axially arranged in the installation area and are arranged on the steel reinforcement framework; the two axial ends of the steel strand penetrate through the first connecting plate; the stretching end anchor is close to the first connecting plate and is arranged on the outer circumferential surface of the steel strand; the tensioning end stiffening plates are arranged in the installation area and are positioned at two axial ends of the steel strand; the horizontal pegs are equidistantly arranged in the installation area, and the installation area is filled with a concrete layer.

In a specific embodiment, the first connecting plate is provided with a preformed hole for the steel strand to penetrate, the section of the preformed hole is larger than the outer diameter of the steel strand, and the section of the preformed hole is smaller than the outer diameter of the anchor at the tensioning end.

In a specific embodiment, at least four threaded holes are vertically formed in the second connecting plate.

In a specific embodiment, the beam body is i-shaped in cross section.

In a specific embodiment, the reinforcement cage comprises an upper longitudinal bar, a lower longitudinal bar and a stirrup; the upper longitudinal ribs and the lower longitudinal ribs are axially arranged at the upper end and the lower end of the installation area, and the stirrups are connected between the upper longitudinal ribs and the lower longitudinal ribs.

In a specific embodiment, two ends of the upper longitudinal rib and the lower longitudinal rib in the axial direction are respectively provided with a 90-degree hook.

Compared with the prior art, the utility model has the beneficial effects that:

1. compared with the prior art, the steel strand is combined with the beam body, and the deflection of the large-span steel structural member caused by dead weight and constant floor load can be eliminated by applying proper prestress, so that the deflection of the beam body is close to zero under normal use conditions, the pre-arching during the processing of the steel member can be avoided, the size of a beam node is smaller on the premise of the same bearing capacity, the construction cost is saved, and meanwhile, the beam body can simultaneously carry out steel strand tensioning, tensioning end anchoring and concrete pouring coating procedures through a plurality of members, and the beam body can be produced in batch and has simple and rapid production procedures.

Drawings

FIG. 1 is a schematic perspective view of the present utility model;

FIG. 2 is a schematic cross-sectional view of the present utility model;

fig. 3 is a schematic representation of a variable cross-section of the present utility model.

In the figure: 1. a beam body; 11. a secondary beam upper plate; 12. a secondary beam lower plate; 13. a first connection plate; 131. a preformed hole; 14. a second connecting plate; 141. a threaded hole; 2. a reinforcement cage; 21. upper longitudinal ribs; 22. a lower longitudinal rib; 23. stirrups; 24. a hook; 3. steel strand; 4. stretching an end anchor; 5. stretching the end stiffening plate; 6. a horizontal peg; 7. and (3) a concrete layer.

Detailed Description

The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

Referring to fig. 1, the large-span prestressed PEC secondary beam provided by the utility model comprises a beam body 1, a steel reinforcement framework 2, steel strands 3, a tensioning end anchor 4, a tensioning end stiffening plate 5 and horizontal pegs 6.

The beam body 1 comprises a secondary beam upper plate 11, a secondary beam lower plate 12, a first connecting plate 13 and a second connecting plate 14; at least two first connecting plates 13 are connected between the secondary beam upper plate 11 and the secondary beam lower plate 12, and the two first connecting plates 13 form a mounting area between the secondary beam upper plate 11 and the secondary beam lower plate 12; the second connection plate 14 is vertically connected to the first connection plate 13.

The reinforcement cages 2 are equidistantly arranged in the installation area; the steel strands 3 are axially arranged in the installation area and are arranged on the steel reinforcement framework 2; the two axial ends of the steel strand 3 penetrate through the first connecting plate 13; the stretching end anchorage device 4 is close to the first connecting plate 13 and is arranged on the outer circumferential surface of the steel strand 3; the tensioning end stiffening plates 5 are arranged in the installation area and are positioned at the two axial ends of the steel strand 3; the horizontal pegs 6 are equally spaced in an installation area filled with a concrete layer 7.

In the assembly process, the secondary beam upper plate 11, the secondary beam lower plate 12, the first connecting plate 13 and the second connecting plate 14 are welded into a beam body 1, an installation area is formed between the two first connecting plates 13, the steel reinforcement frameworks 2 are equidistantly arranged in the installation area, the steel strands 3 are arranged on the steel reinforcement frameworks 2, the two axial ends of the steel strands 3 penetrate through the first connecting plates 13 and are fixed through the tensioning end anchor 4, one surface opposite to the two first connecting plates 13 is located in the installation area, a tensioning end stiffening plate 5 matched with the steel strands 3 is arranged in the installation area, a plurality of horizontal pegs 6 are arranged in the installation area, and after the arrangement is finished, the concrete layer 7 is filled in the installation area.

In order to improve the matching efficiency of the first connecting plate 13 and the steel strands 3, referring to fig. 1 and 2, in a preferred embodiment, the first connecting plate 13 is provided with a preformed hole 131 for the steel strands 3 to pass through, the cross section of the preformed hole 131 is larger than the outer diameter of the steel strands 3, and the cross section of the preformed hole 131 is smaller than the outer diameter of the tension end anchor 4.

By providing the preformed hole 131, the steel strand 3 is facilitated to penetrate the first connecting plate 13, thereby facilitating the cooperation with the tensioning end anchor 4.

In order to improve the working efficiency of the reinforcement cage 2, referring to fig. 1-3, in a preferred embodiment, at least four threaded holes 141 are vertically formed in the second connecting plate 14, the cross section of the beam body 1 is i-shaped, and the reinforcement cage 2 includes an upper longitudinal rib 21, a lower longitudinal rib 22 and a stirrup 23; the upper longitudinal bar 21 and the lower longitudinal bar 22 are axially arranged at the upper end and the lower end of the installation area, a stirrup 23 is connected between the upper longitudinal bar 21 and the lower longitudinal bar 22, and both axial ends of the upper longitudinal bar 21 and the lower longitudinal bar 22 are respectively provided with a 90-degree hook 24.

The screw holes 141 are formed, the beam body 1 and an external frame beam are conveniently connected and fixed through the screw holes 141, the reinforcement cage 2 is formed by binding the upper longitudinal ribs 21, the lower longitudinal ribs 22 and the stirrups 23 in advance, the whole body is installed in an installation area, the straight ends of the hooks 24 with the angle of 90 degrees are welded with the inner sides of the first connecting plates 13, and the whole reinforcement cage 2 is fixedly installed.

For a better understanding of the present utility model, the operation of a large span prestressed PEC secondary beam of the present utility model is described in detail below with reference to fig. 1-3: in the assembly process, a plurality of threaded holes 141 are formed in the second connecting plate 14, preformed holes 131 are formed in the first connecting plate 13, the aperture of each preformed hole 131 is larger than the outer diameter of the steel strand 3 and smaller than the outer diameter of the tensioning end anchor 4, and therefore a prestress steel strand 3 tensioning channel is formed; the inner side of the first connecting plate 13 is welded with a tensioning end stiffening plate 5 at two sides of a reserved hole 131, wherein an upper longitudinal rib 21, a lower longitudinal rib 22 and stirrups 23 form a steel reinforcement framework 2, the steel reinforcement framework 2 is equidistantly arranged in an installation area, after the steel reinforcement framework 2 is installed, a steel strand 3 penetrates through the reserved hole 131 on the first connecting plate 13 to realize tensioning of the steel strand 3, a tensioning end anchor 4 is fixed at the outer side of the first connecting plate 13, and in order to prevent local pressure damage of concrete at an anchoring end of the steel strand 3, the tensioning end stiffening plates 5 are arranged at the left side and the right side of the steel strand 3 at the inner side of the first connecting plate 13, and the tensioning end stiffening plates 5 are welded and fixed with the first connecting plate 13 and the lower flange of the beam body 1; when the span of the beam body 1 is large, a constant section mode can be adopted, the span of the beam body 1 is not large, a variable section mode can be adopted when the span bending bearing capacity is rich, as shown in figure 3, so as to increase the net height of the indoor space, the device combines the steel stranded wires 3 with the beam body 1, and the deflection caused by the dead weight of a large-span steel structural member and the constant load of a floor can be eliminated by applying proper prestress, so that the deflection of the beam body 1 is close to zero under the normal use condition, the pre-arching during the processing of the steel structural member can be avoided, the beam node size is smaller under the premise of the same bearing capacity, the construction cost is saved, meanwhile, the steel stranded wires 3 can be tensioned by a plurality of members of the beam body 1, the tensioning end is anchored, the concrete casting procedure is coated, and the production procedure is simple and quick.

The above-described embodiments of the present utility model do not limit the scope of the present utility model. Any other corresponding changes and modifications made in accordance with the technical idea of the present utility model shall be included in the scope of the claims of the present utility model.

Claims

1. A large span prestressed PEC secondary beam, characterized by: the steel bar comprises a beam body, a steel bar framework, steel strands, a tensioning end anchor, a tensioning end stiffening plate and horizontal pegs;

2. A large span prestressed PEC secondary beam as claimed in claim 1, wherein: the first connecting plate is provided with a preformed hole for the steel strand to penetrate through, the section of the preformed hole is larger than the outer diameter of the steel strand, and the section of the preformed hole is smaller than the outer diameter of the tension end anchorage device.

3. A large span prestressed PEC secondary beam as claimed in claim 1, wherein: at least four threaded holes are vertically formed in the second connecting plate.

4. A large span prestressed PEC secondary beam as claimed in claim 1, wherein: the cross section of the beam body is I-shaped.

5. A large span prestressed PEC secondary beam as claimed in claim 1, wherein: the steel reinforcement framework comprises upper longitudinal ribs, lower longitudinal ribs and stirrups; the upper longitudinal ribs and the lower longitudinal ribs are axially arranged at the upper end and the lower end of the installation area, and the stirrups are connected between the upper longitudinal ribs and the lower longitudinal ribs.

6. A large span prestressed PEC secondary beam as claimed in claim 5, wherein: the upper longitudinal ribs and the lower longitudinal ribs are provided with hooks at 90 degrees at two axial ends.