CN117966968A - Prefabricated large opening partially covered steel concrete beam and construction method - Google Patents
Prefabricated large opening partially covered steel concrete beam and construction method Download PDFInfo
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- CN117966968A CN117966968A CN202410143208.2A CN202410143208A CN117966968A CN 117966968 A CN117966968 A CN 117966968A CN 202410143208 A CN202410143208 A CN 202410143208A CN 117966968 A CN117966968 A CN 117966968A
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/29—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures
- E04C3/293—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures the materials being steel and concrete
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/14—Producing shaped prefabricated articles from the material by simple casting, the material being neither forcibly fed nor positively compacted
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
- B28B23/022—Means for inserting reinforcing members into the mould or for supporting them in the mould
- B28B23/024—Supporting means
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
- E04C5/06—Reinforcing elements of metal, e.g. with non-structural coatings of high bending resistance, i.e. of essentially three-dimensional [3D] extent, e.g. lattice girders
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
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- Architecture (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Ceramic Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Composite Materials (AREA)
- Rod-Shaped Construction Members (AREA)
Abstract
The prefabricated large-hole part-cladding steel reinforced concrete beam adopts the concept of partially prefabricated part cast-in-situ, and consists of a prefabricated part and a cast-in-situ part, wherein the prefabricated part is manufactured in a factory and comprises hole H-shaped steel; the H-shaped steel comprises a web plate, an end plate, a lower flange plate and an upper flange plate; the end plate is arranged at the end part of the section steel, and is connected with the web plate, the lower flange plate and the upper flange plate, and the plate surface is vertical to the length direction of the section steel; the web is divided into a first area and a second area, wherein the first area is a profile steel midspan area; the first area is provided with a first hole and is provided with a longitudinal stiffening rib; the second area is provided with a plurality of second holes along the length direction of the section steel and is provided with transverse stiffening ribs; precast high-strength concrete is arranged among the lower flange plate, the upper flange plate and the end plate, a plurality of equidistant shearing connectors are arranged at the top of the upper flange plate, and cast-in-situ concrete slabs are poured. The invention reserves a large hole, facilitates the laying of equipment such as later-stage pipelines and the like, and facilitates the construction by adopting a prefabrication assembly method.
Description
Technical Field
The invention belongs to the technical field of buildings, and particularly relates to a prefabricated large-hole partially-coated steel reinforced concrete beam and a construction method thereof.
Background
In modern reinforced concrete structures, most forms are cast-in-situ reinforced concrete structures, which are structures formed by formwork supporting and pouring on construction sites, and have the advantages of good integrity, high rigidity, good seepage resistance, but also have a plurality of defects, such as complex construction procedures, large labor force requirement, long construction period, large design section, large material consumption, large occupied space and the like.
Along with the development of building construction technology, an assembled concrete structure appears, which is a concrete structure formed by assembling and connecting precast concrete members. The method is used for carrying out most construction operations in factories, can realize industrial production, has less influence on pouring of components by the environment, and has strong quality controllability. The local pouring is carried out on site, so that the production efficiency is greatly improved, the construction period is shortened, and a large amount of templates and manpower are saved. But also has the defects of poor integrity, poor impermeability, unfavorable earthquake resistance and the like.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide the prefabricated large-hole partially-coated steel reinforced concrete beam and the construction method, which adopt the concept of 'partially prefabricating and partially casting in situ', keep the advantages of prefabricating and casting in situ, adopt a steel reinforced concrete structure, reserve holes in the cross-beam region to facilitate the laying of equipment such as pipelines and the like, facilitate construction, have short construction period, improve the bearing capacity, the cracking resistance and the fire resistance, reduce the concrete consumption, reduce the structural dead weight, save templates and have good economy.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the prefabricated large-hole partially-coated steel reinforced concrete beam comprises hole H-shaped steel, wherein the hole H-shaped steel comprises a web plate, an end plate, a lower flange plate and an upper flange plate;
the end plate is arranged at the end part of the section steel, and is connected with the web plate, the lower flange plate and the upper flange plate, and the plate surface is vertical to the length direction of the section steel;
the web is divided into a first area and a second area, wherein the first area is a profile steel midspan area;
The first area is provided with a first hole, and is provided with longitudinal stiffening ribs, and the first hole is used for equipment laying; the length direction of the longitudinal stiffening rib is parallel to the length direction of the section steel and is arranged at two sides of the first hole;
the second area is provided with a plurality of second holes along the length direction of the section steel and is provided with transverse stiffening ribs, the second holes are used for side pouring, the length direction of the transverse stiffening ribs is perpendicular to the length direction of the section steel, and the transverse stiffening ribs are respectively arranged on two sides of each second hole;
precast high-strength concrete is arranged among the lower flange plate, the upper flange plate and the end plate, a plurality of equidistant shearing connectors are arranged at the top of the upper flange plate, and cast-in-situ concrete slabs are poured.
In one embodiment, the first opening is rectangular, elliptical or rounded rectangular in shape; the shape of the second hole is round or regular polygon.
In one embodiment, a plurality of first longitudinal ribs are arranged on the upper portion of the lower flange plate, a plurality of second longitudinal ribs are arranged on the lower portion of the upper flange plate, a plurality of closed stirrups are arranged between the lower flange plate and the upper flange plate, the length directions of the first longitudinal ribs and the second longitudinal ribs are parallel to the length direction of the section steel, and the closed stirrups are perpendicular to the length direction of the section steel.
In one embodiment, the first longitudinal rib is arranged between the end plates at the two ends, the length of the first longitudinal rib is not more than the distance between the two end plates, the second longitudinal rib is arranged between the end plates and the edge of the first hole, the first longitudinal rib and the second longitudinal rib are arranged in the length direction of the section steel at the same time, and the first hole is not arranged.
In one embodiment, the prefabricated high-strength concrete is poured on two sides of the web plate once and is integrated with the H-shaped steel with holes, the first longitudinal ribs, the second longitudinal ribs and the closed stirrups; the shearing-resistant connecting piece is connected with the H-shaped steel with holes through welding, and the cast-in-situ concrete slab is integrated with the lower part through cast-in-situ concrete.
In one embodiment, double-layer bidirectional plate steel bars are arranged in the cast-in-situ concrete slab, and are arranged symmetrically up and down and avoid the shearing connection piece.
The prefabricated high-strength concrete, the H-shaped steel with holes, the first longitudinal ribs, the second longitudinal ribs, the closed stirrups and the shearing connectors are prefabricated parts, and the cast-in-situ concrete slab and the double-layer bidirectional slab steel bars are cast-in-situ parts.
In one embodiment, the precast high-strength concrete is located between end plates in the length direction, and the open H-section steel of the precast high-strength concrete is not poured outside the end plates and is used for being connected with a stud or welded.
In one embodiment, the cast-in-place concrete slab has a lower concrete strength than the precast high strength concrete.
The invention also provides a construction method for the prefabricated large-opening part coated steel reinforced concrete beam, which comprises the following steps:
Step 1), in a factory, firstly cutting and welding the H-shaped steel with holes, then welding a shearing-resistant connecting piece to an upper flange plate, supporting a bottom die, laterally placing the H-shaped steel with holes on the bottom die, supporting a template with reserved holes at a first hole, pouring prefabricated high-strength concrete, and then curing and removing the die to complete a prefabricated part;
step 2), connecting two ends of the H-shaped steel with the column on site;
Step 3), supporting a floor slab template on the upper part of the H-shaped steel with the holes;
And 4) pouring the cast-in-situ concrete slab.
In one embodiment, the step 1) is to position and bind the first longitudinal bar, the second longitudinal bar and the closed stirrup after the cutting and welding of the H-shaped steel with the hole are completed, place the longitudinal bars on two sides of the H-shaped steel with the hole and fix the longitudinal bars, and then weld the shearing-resistant connecting piece; and 3) arranging the double-layer bidirectional plate steel bars to avoid the shearing-resistant connecting pieces after supporting the floor slab templates.
Compared with the prior art, the invention has the beneficial effects that:
1. and the structural performance is improved.
Compared with the traditional hole-opened beam, the prefabricated large-hole-opened partially-coated steel reinforced concrete beam is provided with steel, so that the shearing resistance and bending resistance bearing capacity of the beam can be effectively improved, the bending rigidity is improved, and the rigidity reduction caused by hole opening is compensated. The arrangement of the profile steel web plate can restrict the hole, and effectively limit the cracking of the hole. And the section steel is perforated in the area outside the hole, so that the section steel has a bolt action with the poured concrete, and the joint working performance of the section steel and the concrete is enhanced. The prefabricated part adopts high-strength concrete or ultra-high-performance concrete, so that the cracking resistance of the beam can be improved. Compared with the traditional steel-concrete composite beam, concrete is poured on two sides of the section steel, lateral constraint is provided for the section steel, lateral rigidity and stability are improved, part of the steel beam is protected, and durability is improved.
2. Building space utilization rate improvement
The large opening part of the prefabricated and assembled cladding steel reinforced concrete beam reserves rectangular holes on the beam web, so that equipment pipelines in the building can be arranged in a penetrating way, and compared with the traditional mode of arranging the equipment pipelines by bypassing the beam downwards, the net height and the space utilization rate are greatly increased. In addition, the invention adopts a profile steel concrete structure and high-performance concrete, reduces the section height of the beam, and further improves the net height and the space utilization rate.
3. Convenient construction and good economic benefit
The large-opening part cladding type steel concrete beam is prefabricated, the thought of partial prefabricated assembly is adopted, the beam main body is prefabricated in a processing factory, the prefabricated beam and the column are connected and installed in a construction site, and then the construction operation is completed by pouring slab concrete, so that the construction procedures and the construction time of the construction site are reduced, the construction efficiency is improved, and the construction cost is reduced. In addition, in the prefabrication process, the beam can be placed sideways, the upper flange plate, the lower flange plate and the end plate of the profile steel are used as part of templates, concrete pouring can be performed only by re-supporting one side of the templates, and as the profile steel is provided with the holes, concrete pouring on two sides of the web can be performed once, so that the trouble that the traditional PEC beam needs to be poured twice is avoided, the construction period is shortened, and the template materials are saved. The reserved holes can facilitate the pipeline to pass through, reduce the material length of the pipeline and reduce the manufacturing cost.
In general, the prefabricated large-hole partially-coated steel reinforced concrete beam can exert good structural performance of the combined structure, can facilitate equipment pipeline arrangement on the basis, improves the utilization rate of building space, simplifies construction procedures and construction difficulty, reduces concrete consumption, reduces cost, saves resources and is environment-friendly.
Drawings
Fig. 1 is a schematic perspective view of the present invention.
FIG. 2 is a schematic view of a portion of a prefabricated portion steel construction according to the present invention.
FIG. 3 is a schematic view of a prefabricated portion of the present invention.
FIG. 4 is a schematic cross-sectional view of the section steel of the present invention at the first hole.
FIG. 5 is a schematic cross-sectional view of a second hole of the steel section of the present invention.
FIG. 6 is a schematic cross-sectional view of a prefabricated portion of the present invention at a first opening.
FIG. 7 is a schematic cross-sectional view of a second hole of the prefabricated portion of the present invention.
FIG. 8 is a schematic cross-sectional view of the invention at the first hole after cast-in-place.
FIG. 9 is a schematic cross-sectional view of the present invention at a second hole after cast-in-place.
Icon: 1-prefabricating high-strength concrete; 2-cast-in-situ concrete slab; 3-punching H-shaped steel; 3-1-web; 3-2-transverse stiffeners; 3-3-longitudinal stiffeners; 3-4-end plates; 3-5-lower flange plates; 3-6-upper flange plates; 3-1-1-first region; 3-1-2-second region; 3-1-1-1-first openings; 3-1-2-1-second hole; 4-longitudinal rib I; 5-a second longitudinal rib; 6-stirrups; 7-double-layer bidirectional plate steel bars; 8-shear connectors.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings and examples.
In order to improve the integrity, the impermeability, the earthquake resistance and the like of the fabricated concrete structure, the invention provides a prefabricated large-hole partially-coated steel reinforced concrete beam, which comprises hole H-shaped steel 3 as shown in figures 1 to 9, wherein the hole H-shaped steel 3 mainly comprises a web plate 3-1, end plates 3-4, a lower flange plate 3-5 and an upper flange plate 3-6.
For convenience of description, the directions in the present invention are defined as follows: longitudinal, which refers to a direction parallel to the length of the section steel; the transverse direction refers to a direction perpendicular to the length of the section steel and perpendicular to the upper and lower flanges, that is, a connection direction of the upper and lower flanges, and may also be referred to as an up-down direction.
The end plates 3-4 are arranged at two ends of the section steel, a certain space is reserved, the end plates 3-4 are simultaneously connected with the web plate 3-1, the lower flange plate 3-5 and the upper flange plate 3-6, and the plate surfaces of the end plates are perpendicular to the length direction of the section steel.
The web plate 3-1 is divided into a first area 3-1-1 and a second area 3-1-2, wherein the first area 3-1-1 is a section steel transonic area, and the second area 3-1-2 is arranged on two sides of the section steel transonic area.
The first area 3-1-1 is provided with a first hole 3-1-1 and is provided with a longitudinal stiffening rib 3-3, the first hole 3-1-1-1 is used for paving equipment, the size of the first hole is relatively larger for the equipment to pass through, and the first hole 3-1-1-1 is also a large hole defined by the invention. The longitudinal stiffening ribs 3-3 are arranged on two sides of the first hole 3-1-1 in parallel with the length direction of the section steel, and obviously, the two sides can be not only the upper side and the lower side, but also the two sides of the plate surface of the web plate 3-1.
The second area 3-1-2 is provided with a plurality of second holes 3-1-2-1 along the length direction of the section steel, transverse stiffening ribs 3-2 are arranged, the second holes 3-1-2-1 are used for side pouring, and the size of the second holes is relatively smaller than that of the first holes 3-1-1-1. The length direction of the transverse stiffening rib 3-2 is perpendicular to the length direction of the section steel and is respectively arranged at two sides of each second hole 3-1-2-1, and obviously, two sides of the transverse stiffening rib not only can be two sides along the length direction of the section steel, but also can be two sides of the plate surface of the web plate 3-1.
The prefabrication defined by the invention also comprises prefabrication high-strength concrete 1 between the lower flange plate 3-5, the upper flange plate 3-6 and the end plate 3-4. A plurality of equally spaced shearing connectors 8 are arranged at the top of the upper flange plates 3-6, and cast-in-situ concrete plates 2 are poured, wherein the cast-in-situ concrete plates 2 are the main cast-in-situ parts of the invention.
According to the structure, the H-shaped steel 3 with the holes can ensure the shearing resistance and bending resistance bearing capacity of the beam, and make up for the rigidity reduction caused by the holes. The arrangement of the first hole opening 3-1-1-1 can enable equipment pipelines in a building to be arranged in a penetrating mode, so that the material consumption length of the pipelines can be reduced, and the net height and the space utilization rate can be increased. Although the web 3-1 is provided with a larger first opening 3-1-1-1, by providing it in the midspan region, the web 3-1 is able to restrain it, preventing the opening from cracking. The second areas 3-1-2 are provided with a plurality of relatively smaller second openings 3-1-2-1, so that the second areas can be in pin action with poured concrete, and the working performance of the section steel concrete is enhanced. And the second opening 3-1-2-1 can also be used for beam side pouring, and the H-shaped steel 3 with the opening is used as a part of a template, so that the template is reduced, and the construction is convenient.
The number, length, thickness, width, position and other design parameters of the transverse stiffening ribs 3-2 and the longitudinal stiffening ribs 3-3 can be optimally designed according to the corresponding design calculation method.
In some embodiments of the invention, referring to fig. 2 and 3, the first opening 3-1-1 is rectangular, oval or rounded rectangular in shape, primarily for the purpose of mating with a piercing device, the opening being sized according to the engineering pipe. The second openings 3-1-2-1 are circular or regular polygonal, such as regular hexagonal, and regular symmetrical shapes can achieve better effects.
As shown in fig. 2, a plurality of first longitudinal ribs 4 are arranged on the upper portion of the lower flange plate 3-5, a plurality of second longitudinal ribs 5 are arranged on the lower portion of the upper flange plate 3-6, a plurality of closing stirrups 6 are arranged between the lower flange plate 3-5 and the upper flange plate 3-6, the length directions of the first longitudinal ribs 4 and the second longitudinal ribs 5 are parallel to the length direction of the section steel, and the closing stirrups 6 are perpendicular to the length direction of the section steel. By arranging the longitudinal ribs I4, the longitudinal ribs II 5 and the closed stirrup 6, a better synergistic effect with concrete is achieved.
As shown in fig. 2, the first longitudinal rib 4 is arranged between the end plates 3-4 at the two ends, the length of the first longitudinal rib does not exceed the distance between the two end plates 3-4, the second longitudinal rib 5 is arranged between the end plates 3-4 and the edge of the first hole 3-1-1-1, the length of the second longitudinal rib is from the end plates to the first hole 3-1-1-1, the closed stirrup 6 is arranged at the first longitudinal rib 4 and the second longitudinal rib 5 in the length direction of the section steel, and the first hole 3-1-1-1 is not arranged.
As shown in fig. 1 and 3, precast high-strength concrete 1 is poured on both sides of a web 3-1 once, and is integrated with a hole H-shaped steel 3, a longitudinal rib one 4, a longitudinal rib two 5 and a closed stirrup 6. The shearing resistant connecting piece 8 is connected with the H-shaped steel 3 through welding, and the cast-in-situ concrete slab 2 is integrated with the lower part through cast-in-situ concrete.
As shown in fig. 1, a double-layer bidirectional plate steel bar 7 is arranged in the cast-in-situ concrete slab 2, and the double-layer bidirectional plate steel bar 7 is arranged symmetrically up and down and avoids the shearing resistant connecting piece 8.
In this embodiment, referring to fig. 3, prefabricated high-strength concrete 1 is located between end plates 3-4 in the length direction, and open H-section steel 3 of prefabricated high-strength concrete 1 is not poured outside end plates 3-4 for connection with stud bolts or welding.
As shown in fig. 1 and 3, prefabricated high-strength concrete 1, hole H-shaped steel 3, longitudinal ribs one 4, longitudinal ribs two 5, closed stirrups 6 and shear connectors 8 are prefabricated parts, and cast-in-situ concrete slab 2 and double-layer bidirectional plate steel bars 7 are cast-in-situ parts.
In some embodiments of the invention, the shear connectors 8 may be pegs, bolts, PBL connectors or angle steel, the number of connectors being dependent on the actual need.
In some embodiments of the present invention, the cast-in-situ concrete slab 2 has a lower concrete strength than the precast high-strength concrete 1, and recycled concrete, lightweight aggregate concrete, and sound insulation concrete may be used for the cast-in-situ concrete slab 2. The prefabricated high-strength concrete 1 adopts high-strength concrete or ultra-high-performance concrete, and can improve the bearing capacity, the cracking resistance and the durability of the partially-coated steel reinforced concrete beam. And moreover, the section height of the beam can be reduced by adopting a steel reinforced concrete structure and high-performance concrete, so that the net height and the space utilization rate are further improved.
The invention discloses a prefabricated large-hole part coated steel reinforced concrete beam, which comprises the following construction steps:
Step 1, cutting and welding the H-shaped steel 3 with holes at a factory, positioning and binding the first longitudinal rib 4, the second longitudinal rib 5 and the closed stirrup 6, placing and fixing the H-shaped steel 3 with holes at two sides, welding the shearing-resistant connecting piece 8 to the upper flange plate 3-6, supporting the bottom die, placing the H-shaped steel 3 with holes at the side of the bottom die, supporting a template with reserved holes at the position of the first hole 3-1-1, pouring precast high-strength concrete 1, and curing and removing the die to finish the precast part.
And 2, connecting section steel at two ends of the H-shaped steel 3 with the column on site.
And 3, supporting a floor slab template on the upper part of the H-shaped steel 3, and arranging the double-layer bidirectional plate steel bars 7 to avoid the shearing-resistant connecting pieces.
And 4, pouring the cast-in-situ concrete slab 2.
The construction process adopts the idea of partial prefabrication and assembly, the beam main body is prefabricated in a processing factory, the prefabricated beam and the column are connected and installed on a construction site, and then a cast-in-situ concrete slab 2 is poured, so that the construction operation is completed. Furthermore, the beam can be placed and poured laterally in the prefabrication stage, the upper and lower flange plates and the end plates are used as partial templates, and pouring can be performed only by supporting one side of the templates. The arrangement of the second hole 3-1-2-1 can enable concrete pouring on two sides of the web plate to be carried out at one time, so that the construction period is further shortened.
On the whole, on the basis of the traditional assembled partially-coated steel reinforced concrete composite beam, the hole is reserved in the beam web, and the section steel extending out of the hole is also provided with the hole, so that the dead weight of the composite beam is reduced, the joint working performance of concrete and section steel is improved, the construction pouring and the installation of equipment pipelines are convenient, and the space utilization rate is improved. Meanwhile, high-strength high-performance concrete is adopted, so that the stress performance of the beam is improved. According to the design method provided by the invention, the position, the size and the form (circular, rectangular and regular polygon) of the web hole can be further optimized, the strength of cast-in-situ concrete (recycled concrete, lightweight aggregate concrete and sound insulation concrete) and the form of concrete slab (profiled steel sheet composite board and laminated board) can be further optimized to realize the optimal design of the embodiment.
Claims (10)
1. The utility model provides a big hole part cladding shaped steel concrete beam of prefabricated assembly, includes hole H shaped steel (3), hole H shaped steel (3) include web (3-1), end plate (3-4), lower flange plate (3-5) and upper flange plate (3-6), its characterized in that:
The end plates (3-4) are arranged at the end parts of the section steel, the web plates (3-1), the lower flange plates (3-5) and the upper flange plates (3-6) are connected, and the plate surfaces are perpendicular to the length direction of the section steel;
The web plate (3-1) is divided into a first area (3-1-1) and a second area (3-1-2), wherein the first area (3-1-1) is a profile steel midspan area;
The first area (3-1-1) is provided with a first hole (3-1-1) for equipment laying, longitudinal stiffening ribs (3-3) are arranged, the length direction of the longitudinal stiffening ribs (3-3) is parallel to the length direction of the section steel, and the longitudinal stiffening ribs are arranged on two sides of the first hole (3-1-1-1);
The second area (3-1-2) is provided with a plurality of second holes (3-1-2-1) for side pouring along the length direction of the section steel, and is provided with transverse stiffening ribs (3-2), the length direction of the transverse stiffening ribs (3-2) is perpendicular to the length direction of the section steel, and the transverse stiffening ribs are respectively arranged at two sides of each second hole (3-1-2-1);
Prefabricated high-strength concrete (1) is arranged among the lower flange plate (3-5), the upper flange plate (3-6) and the end plate (3-4), a plurality of equidistant shearing connectors (8) are arranged at the top of the upper flange plate (3-6), and cast-in-situ concrete plates (2) are poured.
2. The prefabricated large opening partially encased steel reinforced concrete beam of claim 1, wherein the first opening (3-1-1) is rectangular, oval or rounded rectangular in shape and the second opening (3-1-2-1) is circular or regular polygonal in shape.
3. The prefabricated large-opening partially-coated steel reinforced concrete beam according to claim 1, wherein a plurality of first longitudinal ribs (4) are arranged on the upper portion of the lower flange plate (3-5), a plurality of second longitudinal ribs (5) are arranged on the lower portion of the upper flange plate (3-6), a plurality of closing stirrups (6) are arranged between the lower flange plate (3-5) and the upper flange plate (3-6), the length directions of the first longitudinal ribs (4) and the second longitudinal ribs (5) are parallel to the length direction of the steel section, and the closing stirrups (6) are perpendicular to the length direction of the steel section.
4. The prefabricated large-opening partially-coated steel reinforced concrete beam according to claim 3, wherein the longitudinal rib I (4) is arranged between end plates (3-4) at two ends, the length of the longitudinal rib I is not more than the distance between the two end plates (3-4), the longitudinal rib II (5) is arranged between the end plates (3-4) and the edges of the first hole (3-1-1-1), the closed stirrup (6) is arranged at the longitudinal rib I (4) and the longitudinal rib II (5) in the length direction of the steel, and the first hole (3-1-1-1) is not arranged.
5. The prefabricated large-opening partially-coated steel reinforced concrete beam according to claim 3, wherein the prefabricated high-strength concrete (1) is poured on two sides of the web plate (3-1) once and is integrated with the opening H-shaped steel (3), the longitudinal rib I (4), the longitudinal rib II (5) and the closed stirrup (6); the shearing-resistant connecting piece (8) is connected with the H-shaped steel (3) with holes through welding, and the cast-in-situ concrete slab (2) is integrated with the lower part through cast-in-situ concrete.
6. The prefabricated large-opening partially-coated steel reinforced concrete beam according to claim 3, wherein double-layer bidirectional plate steel bars (7) are arranged in the cast-in-situ concrete slab (2), and the double-layer bidirectional plate steel bars (7) are symmetrically arranged up and down and avoid shearing-resistant connecting pieces (8);
The prefabricated high-strength concrete (1), the H-shaped steel with the holes (3), the first longitudinal ribs (4), the second longitudinal ribs (5), the closed stirrups (6) and the shearing-resistant connecting pieces (8) are prefabricated parts, and the cast-in-situ concrete slab (2) and the double-layer bidirectional slab steel bars (7) are cast-in-situ parts.
7. The prefabricated large-opening partially-coated steel reinforced concrete beam according to claim 1, wherein the prefabricated high-strength concrete (1) is located between end plates (3-4) in the length direction, and the open H-shaped steel (3) of the prefabricated high-strength concrete (1) is not poured outside the end plates (3-4) and is used for being connected with a stud bolt or welded.
8. The prefabricated large opening partially encased steel reinforced concrete beam of claim 1, wherein the concrete strength of the cast-in-place concrete slab (2) is lower than the strength grade of the prefabricated high strength concrete (1).
9. The construction method for prefabricating and assembling the large-opening partially-coated steel reinforced concrete beam as set forth in claim 1, wherein the steps are as follows:
Step 1), in a factory, firstly cutting and welding the H-shaped steel (3) with holes, then welding a shearing-resistant connecting piece (8) to an upper flange plate (3-6), supporting a bottom die, laterally placing the H-shaped steel (3) with holes on the bottom die, supporting a template with reserved holes at a first hole (3-1-1-1), pouring prefabricated high-strength concrete (1), and then curing and removing the die to complete a prefabricated part;
step 2), connecting two ends of the H-shaped steel (3) with the columns on site;
Step 3), supporting a floor slab template at the upper part of the H-shaped steel (3) with the holes;
and 4) pouring the cast-in-situ concrete slab (2).
10. The construction method according to claim 9, wherein, after the hole-forming H-section steel (3) is cut and welded, the first longitudinal rib (4), the second longitudinal rib (5) and the closed stirrup (6) are positioned and bound, placed on two sides of the hole-forming H-section steel (3) and fixed, and then the shearing-resistant connecting piece (8) is welded; and 3) arranging double-layer bidirectional plate steel bars (7) away from the shearing-resistant connecting pieces (8) after supporting the floor slab templates.
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