阅读说明：本技术 一种预应力双腹板型钢混凝土梁 (Prestressed double-web steel reinforced concrete beam ) 是由 杨勇 张树琛 薛亦聪 于云龙 冯世强 徐龙康 于 2021-08-13 设计创作，主要内容包括：一种预应力双腹板型钢混凝土梁,包括：双腹板蜂窝型钢；设置于双腹板蜂窝型钢双腹板之间的空心内模；设置于双腹板蜂窝型钢下翼缘上部且与梁长方向平行的若干波纹管；设置于波纹管内的预应力钢绞线；设置于梁端的钢板；设置于钢板外侧的预应力筋锚具；以及填充于双腹板蜂窝型钢外部以及空心内模与双腹板蜂窝型钢之间的预制混凝土。本发明受力性能优良,可明显提高梁的抗裂能力和抗弯刚度,且梁自重轻利于抗震。(A prestressed double web steel reinforced concrete beam comprising: double-web honeycomb section steel; the hollow inner die is arranged between the double webs of the double-web honeycomb steel; the corrugated pipes are arranged on the upper part of the lower flange of the double-web honeycomb steel and are parallel to the length direction of the beam; the prestressed steel strand is arranged in the corrugated pipe; a steel plate disposed at the beam end; the prestressed tendon anchorage is arranged on the outer side of the steel plate; and the precast concrete is filled outside the double-web plate honeycomb steel and between the hollow inner die and the double-web plate honeycomb steel. The invention has excellent stress performance, can obviously improve the crack resistance and the bending rigidity of the beam, and the self weight of the beam is light and is beneficial to earthquake resistance.)

1. The utility model provides a two web shaped steel concrete beam of prestressing force which characterized in that includes:

double-web honeycomb steel (1);

a hollow inner die (9) arranged between the double webs of the double-web honeycomb steel (1);

the corrugated pipes (10) are arranged on the upper parts of the lower flanges of the double-web honeycomb section steel (1) and are parallel to the length direction of the beam;

the prestressed steel strand (7) is arranged in the corrugated pipe (10);

a steel plate (11) provided at the beam end;

the prestressed tendon anchorage device (8) is arranged on the outer side of the steel plate (11); and

and the precast concrete (6) is filled outside the double-web honeycomb section steel (1) and between the hollow inner die (9) and the double-web honeycomb section steel (1).

2. The prestressed double-web type steel concrete beam as claimed in claim 1, wherein said double-web honeycomb type steel (1) is formed by cutting and welding high-strength steel plates and comprises two symmetrical honeycomb webs.

3. The prestressed double web type steel reinforced concrete beam as claimed in claim 1, further comprising:

a closed stirrup (4) surrounding the double-web honeycomb steel (1);

the beam inner longitudinal rib I (2) is arranged at the inner bottom of the closed hoop (4) and is parallel to the length direction of the beam; and

and the second beam inner longitudinal rib (3) is arranged at the top in the closed hoop (4) ring and is parallel to the length direction of the beam.

4. The prestressed double-web type steel concrete beam as claimed in claim 3, wherein said first in-beam longitudinal reinforcement (2) is bound to the bottom of the closed stirrup (4) ring, and said second in-beam longitudinal reinforcement (3) is bound to the top of the closed stirrup (4) ring.

5. The prestressed double-web type steel concrete girder according to claim 1 or 3, further comprising: and the studs (5) are arranged on the outer parts of the upper flange and the lower flange of the double-web honeycomb section steel (1).

6. Prestressed double web steel reinforced concrete beam according to claim 5, characterized in that said studs (5) are connected to the double web honeycomb steel (1) by welding.

7. The prestressed double-web steel reinforced concrete beam as claimed in claim 1, wherein the prestressed steel strands (7) penetrate through the interior of the embedded corrugated pipe (10), the corrugated pipe (10) is fixed to the upper side of the lower flange of the double-web honeycomb steel (1), the prestressed steel strands (7) are linear or parabolic, and are tensioned to a design value by a post-tensioning method.

8. Prestressed double web steel reinforced concrete beam according to claim 1, characterized in that said precast concrete (6) is integrated by one casting and wraps the double web honeycomb steel (1) in its entirety.

9. Prestressed double web steel reinforced concrete beam according to claim 1 or 8, characterized in that said precast concrete (6) is ultra high performance concrete.

Technical Field

The invention belongs to the technical field of buildings, and particularly relates to a prestressed double-web steel reinforced concrete beam.

Background

The structural steel concrete structure is widely applied to various structures due to excellent stress performance, and in high-rise, super-high and large-span structures, in order to meet the bearing capacity requirement of the structure, the cross section size of a member is often increased to meet the requirements of bearing capacity and rigidity, so that the use of building materials is increased inevitably, the self weight of the structure is increased, the spatial layout of a building is influenced, and the development of a green environment-friendly building is not facilitated.

And the traditional steel reinforced concrete beam is often very low in cracking load, works with cracks under most conditions, greatly influences the durability of the steel reinforced concrete beam, and particularly under extreme environments, the excellent stress performance of the steel reinforced concrete structure is difficult to give full play, which is not beneficial to the development of sustainable buildings.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide the prestressed double-web section steel concrete beam which adopts the prefabricated prestressing force, solves the problem of complicated field construction of the traditional prestressing structure, and has the advantages of high bearing capacity, good crack resistance, large rigidity, small member section size, small self weight and the like.

In order to achieve the purpose, the invention adopts the technical scheme that:

a prestressed double web steel reinforced concrete beam comprising:

double-web honeycomb section steel;

the hollow inner die is arranged between the double webs of the double-web honeycomb steel;

the corrugated pipes are arranged on the upper part of the lower flange of the double-web honeycomb steel and are parallel to the length direction of the beam;

the prestressed steel strand is arranged in the corrugated pipe;

a steel plate disposed at the beam end;

the prestressed tendon anchorage is arranged on the outer side of the steel plate; and

and the precast concrete is filled outside the double-web plate honeycomb steel and between the hollow inner die and the double-web plate honeycomb steel.

In one embodiment of the invention, the double-web honeycomb-shaped steel is formed by cutting and welding high-strength steel plates and comprises two symmetrical honeycomb webs.

In one embodiment of the present invention, the prestressed double web type steel concrete girder further comprises:

a closed stirrup surrounding the double-web honeycomb steel;

the beam inner longitudinal rib I is arranged at the inner bottom of the closed stirrup ring and is parallel to the beam length direction; and

and the second longitudinal rib is arranged at the top in the closed stirrup ring and is parallel to the beam length direction.

In one embodiment of the invention, the closed stirrup surrounds the double-web honeycomb steel, the first longitudinal rib is bound at the bottom in the closed stirrup ring, and the second longitudinal rib is bound at the top in the closed stirrup ring.

In one embodiment of the present invention, the prestressed double web type steel concrete girder further comprises: the studs are arranged on the outer portions of the upper flange and the lower flange of the double-web honeycomb steel.

In one embodiment of the invention, the stud is connected with the double-web honeycomb steel through welding.

In one embodiment of the invention, the prestressed steel strand penetrates through the embedded corrugated pipe, the corrugated pipe is fixed on the upper side of the lower flange of the double-web honeycomb steel, and the prestressed steel strand is linear or parabolic and is tensioned to a design value by adopting a post-tensioning method.

In one embodiment of the invention, the precast concrete is formed into a whole by one-time pouring and the double-web honeycomb steel is completely wrapped.

In one embodiment of the present invention, the precast concrete is ultra high performance concrete.

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

1) simple and convenient construction

The novel prestressed double-web steel reinforced concrete beam is characterized in that longitudinal bars, stirrups, tie bars and prestressed steel strands are placed at preset positions, the outer package UHPC is poured, and after the concrete strength reaches a certain level, the construction can be completed by stretching and drawing the prestress in a factory. Compared with the traditional composite beam, the construction method avoids the tensioning prestress of the construction site, lightens the workload of casting concrete on site, simplifies the construction process, can greatly improve the construction efficiency, and meets the requirements of energy conservation and emission reduction of green buildings.

2) Excellent performance

Novel two web shaped steel concrete beams of prestressing force is applied to the shaped steel concrete structure with the prestressing force technique, and the deformation of structure reduces under the same load effect, the crack resistance of the roof beam that improves greatly, and outside concrete has better guard action to inside reinforcing bar and shaped steel, and outsourcing concrete adopts super high performance concrete, its high wearability, low porosity and extremely low permeability, the durability of the structure of greatly increasing, especially extreme environment's durability.

3) Good economic benefit

The novel prestress technology of the prestress double-web type steel concrete beam can effectively reduce the cross section of a component, and a hollow inner die is adopted to form the hollow beam, so that the dead weight of the structure is reduced, the earthquake resistance is facilitated, the building materials can be saved, and the construction cost is reduced.

In general, novel prestressing force double web shaped steel concrete beam can exert integrated configuration's advantage, satisfies the requirement of building aesthetic and function again, simplifies the construction steps simultaneously for the construction progress. Can be widely applied to various building structures.

Drawings

Fig. 1 is a perspective view of a prestressed double-web type steel reinforced concrete beam according to the present invention.

Fig. 2 is a side view of a prestressed double web type steel reinforced concrete girder according to the present invention.

Fig. 3 is a top view of a prestressed double web type steel reinforced concrete girder according to the present invention.

Fig. 4 is a detailed view of section a-a of the steel reinforced concrete beam of fig. 2.

Fig. 5 is a schematic view of a beam end of the steel reinforced concrete beam of fig. 1.

Detailed Description

The embodiments of the present invention will be described in detail below with reference to the drawings and examples.

The prestressed double-web steel reinforced concrete beam has excellent stress performance, can obviously improve the crack resistance and the bending rigidity of the beam, and has light self weight and is beneficial to earthquake resistance.

As shown in fig. 1, 2, 3, 4 and 5, the invention comprises a double-web honeycomb steel 1, a plurality of hollow internal molds 9 are arranged between double webs of the double-web honeycomb steel 1, and a steel plate 11 is arranged at the beam end. A plurality of corrugated pipes 10 are arranged on the upper portion of the lower flange of the double-web honeycomb steel 1, the corrugated pipes 10 are parallel to the beam length direction, prestressed steel strands 7 penetrate through the pipes, prestressed tendon anchors 8 are arranged on the outer sides of steel plates 11, the prestressed tendon anchors 8 are used for applying prestress to the prestressed steel strands 7, and precast concrete 6 is filled between the outer portion of the double-web honeycomb steel 1 and the hollow inner die 9 and the double-web honeycomb steel 1.

In the invention, the double-web honeycomb steel 1 is a steel structure formed by cutting and welding high-strength steel plates, and comprises two webs, wherein the two webs are both honeycomb plates and are symmetrically arranged. That is, the honeycomb structure on both webs is symmetrical.

In the invention, the hollow inner die 9 is a hollow die and is arranged between two webs of the double-web honeycomb structural steel 1, and the quantity is selected according to the requirement, so that the arrangement of a honeycomb structure can be avoided.

In the present invention, the steel plate 11 may be welded to the upper surface of the lower flange of the double-web honeycomb section steel 1, and the web of the double-web honeycomb section steel 1 may be slightly shorter than the flange for the convenience of handling.

In the invention, the number of the corrugated pipes 10 is selected according to requirements, and when the number is even, the corrugated pipes can be uniformly and symmetrically fixed on the upper surfaces of the lower flanges at two sides of the double-web plate.

In the invention, the prestressed steel strand 7 penetrates through the inside of the pre-buried corrugated pipe 10, the arrangement form of the prestressed steel strand 7 is linear or parabolic according to specific engineering conditions, and the prestressed steel strand 7 is tensioned to a design value by adopting a post-tensioning method.

In the invention, the precast concrete 6 can be made of ultra-high performance concrete, and is formed into a whole by one-time pouring, and the double-web honeycomb section steel 1 is completely wrapped.

The invention further can also include the reinforcement cage, include specifically: the closed hoop reinforcement 4, the first beam inner longitudinal reinforcement 2 and the second beam inner longitudinal reinforcement 3. Wherein, closed stirrup 4 has a plurality of, encircles along the roof beam length direction and sets up two web honeycomb type steel 1 and arrange, indulges muscle one 2 ligatures in the roof beam and sets up in 4 intra-annular bottoms of closed stirrup, indulges muscle two 3 ligatures in the roof beam and sets up in 4 intra-annular tops of closed stirrup, indulges muscle one 2 in the roof beam and indulges muscle two 3 in the roof beam all parallel with the roof beam length direction.

The invention further can also comprise a stud 5, wherein the stud 5 is welded on the outer parts of the upper flange and the lower flange of the double-web honeycomb steel 1 and is arranged according to the design requirement.

Wherein:

1) the prestressed double-web steel reinforced concrete beam adopts UHPC and a prefabricated prestressing technology, and can improve the anti-cracking performance and the durability of the beam. And the ultrahigh-performance concrete can effectively prevent the web from locally buckling by completely wrapping the profile steel web.

2) The double-web plate honeycomb-shaped steel can improve the bending rigidity and the bearing capacity of the prefabricated reinforced concrete box-shaped beam. Meanwhile, the longitudinal bars can be reduced to configure the main beam, and the site construction process is simplified.

3) The honeycomb-shaped steel can be round, oval or rectangular in hole opening form, and the hole opening form and the hole opening position are reasonably designed and properly arranged according to the bearing capacity requirement and the actual engineering condition. The honeycomb holes effectively connect the precast concrete and the section steel, and ensure good cooperative working performance of the precast concrete and the section steel.

4) The hollow internal mold makes the beam section hollow, can reduce the self weight of the steel reinforced concrete beam, and is beneficial to the anti-seismic and on-site hoisting of the structure.

In conclusion, the invention adopts the double-web honeycomb structural steel and the precast prestress technology on the basis of the traditional steel reinforced concrete beam, solves the problem of insufficient rigidity of the traditional reinforced concrete beam under the large-span working condition, and effectively connects the precast concrete and the structural steel through the honeycomb holes to ensure good cooperative working performance of the precast concrete and the structural steel. Meanwhile, the ultra-high performance concrete (UHPC) is used, and due to the excellent anti-cracking performance and durability of the UHPC, the beam performance is effectively improved, the cracking load is increased, and the service life of the beam is prolonged; the hollow beam is formed by using the hollow inner die in the manufacturing stage, so that the self weight of the structure is further reduced, and the earthquake resistance is facilitated. In a word, according to the design method provided by the invention, the position, size and form (circular, oval and rectangular) of the web plate opening hole and the size and position of the hollow inner membrane of the section can be further optimized so as to meet the actual requirements of different projects.