CN111424869A - Concrete floor secondary beam combined prefabricated part and manufacturing method - Google Patents
Concrete floor secondary beam combined prefabricated part and manufacturing method Download PDFInfo
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- CN111424869A CN111424869A CN202010238752.7A CN202010238752A CN111424869A CN 111424869 A CN111424869 A CN 111424869A CN 202010238752 A CN202010238752 A CN 202010238752A CN 111424869 A CN111424869 A CN 111424869A
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
- E04B5/02—Load-carrying floor structures formed substantially of prefabricated units
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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
- B28B13/00—Feeding the unshaped material to moulds or apparatus for producing shaped articles; Discharging shaped articles from such moulds or apparatus
- B28B13/02—Feeding the unshaped material to moulds or apparatus for producing shaped articles
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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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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
- E04B5/02—Load-carrying floor structures formed substantially of prefabricated units
- E04B5/10—Load-carrying floor structures formed substantially of prefabricated units with metal beams or girders, e.g. with steel lattice girders
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Abstract
The invention discloses a concrete floor secondary beam combined prefabricated part and a manufacturing method thereof, wherein the prefabricated part comprises: the prefabricated concrete slab is formed by pouring concrete; the upper surface of the upper flange of the steel beam of the H-shaped steel secondary beam is welded with the stud, and the stud is buried on the lower surface of the precast concrete slab. According to the technical scheme, the combined prefabricated part is integrally hoisted, the combined prefabricated part is assembled into a whole by reserved steel bars and is connected with the structural main beam, and an integral floor slab system is formed by a small amount of cast-in-place concrete, so that the complex procedures of on-site formwork support are reduced, the on-site concrete casting is avoided, the strength and rigidity of the combined prefabricated part of the secondary beam of the floor slab are obviously improved, the floor slab cannot be damaged due to the influence of self weight during hoisting, and the integral performance of the member is improved.
Description
Technical Field
The invention relates to the technical field of building structures, in particular to a concrete floor secondary beam combined prefabricated part and a manufacturing method of the concrete floor secondary beam combined prefabricated part.
Background
At present, when a steel frame is acted by a horizontal force, the maximum bending moment borne by a main beam of a steel prefabricated part is a negative bending moment at a support, the upper part of the cross section of the support is in tension, and the lower part of the cross section of the support is in compression. Because the tension capacity of the concrete is small, and the steel bars arranged in the slab cannot bear the tension, when the strong column and weak beam of the steel frame is designed, the combined action of the main beam of the prefabricated part and the floor slab is not considered, and the negative bending moment at the node is completely borne by the main beam of the prefabricated part. However, in the conventional cast-in-place concrete floor slab, the concrete and the steel bars of the floor slab bear part of negative bending moment, and the slab and the main beam of the prefabricated part have certain combination effect, so that the general damage is the damage of the strong beam and the weak column when an earthquake occurs.
In the traditional cast-in-place floor slab, the floor slab and the secondary beam can be combined under the stress-free condition, but as a cast-in-place structure, the floor slab and the secondary beam are combined under the stress condition, the combination effect is weak, and the combination is considered unsafe, so that the secondary beam has high section and large deflection. And the cast-in-place formwork erecting procedure is complicated, the concrete curing condition is limited, and the environmental pollution is easy to generate.
Disclosure of Invention
Aiming at least one of the problems, the invention provides a concrete floor secondary beam combined prefabricated component and a manufacturing method thereof, and the prefabricated concrete plate and the H-shaped steel secondary beam adopt the factory prefabrication technology, thereby reducing the complicated procedures of on-site formwork support, avoiding the excessive on-site concrete pouring, and ensuring that the steel beam and the concrete form a reliable combined action under the stress-free condition, obviously improving the strength and the rigidity of the steel beam, preventing the floor slab from being damaged due to the self-weight influence during hoisting, and ensuring that the plane becomes a whole due to the connection action of reserved slab gaps and overhanging reinforcing steel bars, thereby improving the overall performance of the component.
In order to achieve the above object, the present invention provides a concrete floor secondary beam composite prefabricated part, comprising: the prefabricated concrete slab comprises a prefabricated concrete slab and an H-shaped steel secondary beam, wherein the prefabricated concrete slab is formed by pouring concrete; and the upper surface of the upper flange of the steel beam of the H-shaped steel secondary beam is welded with a stud, and the stud is embedded on the lower surface of the precast concrete slab.
In the above technical solution, preferably, the stud is completely embedded in the precast concrete plate, and a lower surface of the precast concrete plate is flush with an upper supporting surface of the steel beam upper flange; the two ends of the steel beam upper flange are flush with the edges of the precast concrete plates, bolt holes are formed in the two ends of a steel beam web plate of the H-shaped steel secondary beam, and the steel beam web plate is connected with the precast member main beam through a primary beam connecting plate and a secondary beam connecting plate and is fixed in the bolt holes of the steel beam web plate through high-strength bolts.
In the above technical solution, preferably, the edge of the precast concrete slab along the span direction is provided with a two-layer step structure, so that the edges of the lower steps at the joint of the slab surfaces of the precast concrete slab along the span direction are connected, and a slab joint is formed between the edges of the upper steps, so as to further pour concrete to form a concrete connection part; the upper portion of the precast concrete slab is transversely and longitudinally distributed with slab reinforcing steel bars along the slab direction, the two ends of the slab reinforcing steel bars along the span direction extend out of the edge of the precast concrete slab and exceed the edge of the lower step, the two ends of the slab reinforcing steel bars along the direction perpendicular to the span direction are aligned with the edge of the lower step of the precast concrete slab, the lower portion of the precast concrete slab is transversely and longitudinally distributed with slab bottom reinforcing steel bars along the slab direction, the two ends of the slab bottom reinforcing steel bars along the span direction are aligned with the edge of the lower step of the precast concrete slab, and the two ends of the slab bottom reinforcing steel bars along the transverse span direction extend out of the edge of the precast concrete slab.
In the above technical solution, preferably, a hole is formed in the steel beam web of the H-shaped steel secondary beam to pass through a pipeline.
In the above technical scheme, preferably, the stud is welded on the upper surface of the prefabricated member girder, the stiffening rib with flush edge is welded between the upper flange and the lower flange of the prefabricated member girder, the steel beam web of the H-shaped steel secondary beam is aligned with the upper flange and the stiffening rib of the prefabricated member girder, and the steel beam web and the stiffening rib are fixedly connected through the primary and secondary beam connecting plate.
In the above technical solution, preferably, the portions of the plate-surface reinforcing steel bars and the plate-bottom reinforcing steel bars extending out of the edges of the precast concrete plates are not less than 50 mm.
The invention also provides a concrete floor secondary beam combined prefabricated part, which is compared with the concrete floor secondary beam combined prefabricated part in any one of the technical schemes: the upper flange of the steel beam of the H-shaped steel secondary beam is not provided with a stud, and the upper flange of the steel beam and the upper half part of the steel beam web plate of the H-shaped steel secondary beam are embedded into the precast concrete plate.
In the above technical solution, preferably, additional steel bars are welded to two sides of the upper portion of the steel beam web of the H-shaped steel secondary beam, two ends of the upper flange of the steel beam extend out of the edge of the precast concrete slab, and the extending portion is erected on the main beam of the precast member.
The invention also provides a manufacturing method of the concrete floor secondary beam combined prefabricated part, which is applied to the concrete floor secondary beam combined prefabricated part in any one of the technical schemes and comprises the following steps: determining the position of a precast concrete plate template, and installing the precast concrete plate template in a direction that the upper surface of the precast concrete plate faces downwards; and inserting an H-shaped steel secondary beam at a preset position while pouring concrete in the precast concrete slab template to form the precast concrete slab.
In the above technical solution, preferably, the precast concrete slabs are fixed or overlapped with the precast member main beam according to a preset position, the precast concrete slabs are spliced with each other and concrete is poured between slab joints at the joints of the precast concrete slabs, and concrete is poured at the joints of the precast member main beam and the columns to form a combined precast member with a flat surface.
Compared with the prior art, the invention has the beneficial effects that:
1) the invention adopts the factory prefabrication technology for the precast concrete plate and the H-shaped steel secondary beam in the combined precast element, and the precast concrete plate and the H-shaped steel secondary beam are integrally prefabricated and hoisted in a factory, so that the floor slab can have a large span, the complex procedures of on-site formwork support are reduced, and the on-site concrete pouring is avoided, thereby not only improving the concrete curing condition, but also reducing the environmental pollution.
2) Because the combined prefabricated parts are prefabricated in a factory, the construction speed and the quality of concrete can be greatly improved, the steel beam and the concrete form a reliable combined action under the stress-free condition, the combined action is strong, and the strength and the rigidity of the steel beam are obviously improved under the same external load action. The deflection problem of the floor slab and the secondary beam in the construction stage before the concrete is hardened can meet the deflection requirements in the construction stage and the normal use stage by increasing the size of the prefabricated slab or utilizing the reverse arch action. The steel beam web plates are provided with holes, so that the pipeline laying is facilitated, the problem that the fully-prefabricated floor slab is not good in pre-buried pipeline can be solved, the dead weight can be effectively reduced, and the steel materials are saved.
3) And the concrete is hoisted on site, and when no secondary beam exists, the middle of a larger pure concrete floor slab is not supported, so that the concrete floor slab is easily damaged during hoisting. When the invention is supported by the secondary beam, the floor slab can not be damaged due to the self-weight influence during hoisting, a small amount of concrete is poured at the joint of the precast concrete slab, and the connection action of the reserved groove and the overhanging reinforcing steel bar enables the plane to be integrated, and the plane can bear a part of bending moment, thereby improving the integral performance of the member.
4) No matter the H-shaped steel secondary beam is connected with the precast concrete slab by means of the studs or the upper flange of the steel beam and the upper half part of the web plate are embedded into the precast concrete slab, a good combination effect can be formed, and the concrete can help the upper flange of the secondary beam to be pressed, so that the size of the upper flange of the steel secondary beam can be reduced, the height of a floor slab secondary beam combined precast element is reduced, and a higher space is provided for a building.
5) The floor slab has no good combination effect between the main beam and the floor slab in the area where the main beam is connected with the upright post due to post-pouring of concrete, the cross section resisting moment of the main beam is smaller, and the mechanism of strong columns and weak beams is favorably ensured. But the floor and the secondary beam have good combined action, and the secondary beam and the main beam are reliably connected, so that the floor cannot fall off even if the floor and the main beam do not have good combined action, and the good anti-seismic performance of the assembly frame system is well ensured.
Drawings
Fig. 1 is a schematic view of an integral splicing structure of a concrete floor secondary beam combined prefabricated part according to an embodiment of the invention;
FIG. 2 is a schematic structural view of a precast concrete slab-H-beam structure according to an embodiment of the present invention;
fig. 3 is a schematic structural view of a precast concrete slab-H-type steel secondary beam structural member according to another embodiment of the present invention;
FIG. 4 is a schematic view of the connection between the main beam and the secondary beam of the prefabricated part disclosed in the embodiment of FIG. 2;
FIG. 5 is a schematic view of the connection between the main beam and the secondary beam of the prefabricated part disclosed in the embodiment of FIG. 3;
FIG. 6 is a schematic view of an overlapping structure of prefabricated parts and a girder of the prefabricated parts according to an embodiment of the present invention;
FIG. 7 is a cross-sectional view of the overlapping structure of the long sides of precast concrete panels and the precast member main beams disclosed in the embodiment of FIG. 2;
FIG. 8 is a cross-sectional view of the overlapping structure of the long sides of precast concrete panels and the precast member main beams disclosed in the embodiment of FIG. 3;
FIG. 9 is a cross-sectional view of the overlapping structure of the short sides of precast concrete panels and the precast element main beams disclosed in the embodiment of FIG. 2;
fig. 10 is a cross-sectional view of the overlapping structure of the short side of the precast concrete panel and the girder of the precast member disclosed in the embodiment of fig. 3.
In the drawings, the correspondence between each component and the reference numeral is:
1. the prefabricated concrete slab comprises a prefabricated concrete slab, 2. H-shaped steel secondary beams, 3. prefabricated component main beams, 4. plate surface reinforcing steel bars, 5. plate bottom reinforcing steel bars, 6. studs, 7. primary and secondary beam connecting plates, 8. main beam column connecting plates, 9. high-strength bolts, 10. additional reinforcing steel bars and 11. stand columns.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The invention is described in further detail below with reference to the attached drawing figures:
as shown in fig. 1, the present invention provides a concrete floor secondary beam composite prefabricated part, comprising: the prefabricated concrete slab comprises a prefabricated concrete slab 1 and an H-shaped steel secondary beam 2, wherein the prefabricated concrete slab is formed by pouring concrete; and the upper surface of the upper flange of the steel beam of the H-shaped steel secondary beam is welded with a stud, and the stud is embedded on the lower surface of the precast concrete slab.
In the embodiment, the factory prefabrication technology is adopted for the precast concrete plates 1 and the H-shaped steel secondary beams 2, the complex procedures of on-site formwork erection are reduced, the excessive on-site concrete pouring is avoided, the steel beams and the concrete form a reliable combined action under the stress-free condition, the strength and the rigidity of the steel beams are obviously improved, the floor slab cannot be damaged due to the self-weight influence during hoisting, and the overall performance of the member is improved. The flexibility problem of the floor slab and the secondary beam in the construction stage before the concrete is hardened can meet the flexibility requirements in the construction stage and the normal use stage by increasing the size of the precast concrete slab 1 or utilizing the reverse arch action. And the concrete is hoisted on site, and when no secondary beam exists, the middle of a larger pure concrete floor slab is not supported, so that the concrete floor slab is easily damaged during hoisting. When the secondary beam supports the floor slab, the floor slab cannot be damaged due to the influence of self weight during hoisting.
As shown in fig. 2, a first connection scheme of the H-beam 2 and the precast concrete slab 1 in the above embodiment specifically includes:
two rows of pegs 6 are welded on the upper supporting surface of the upper flange of the steel beam of the H-shaped steel secondary beam 2, the height of each peg 6 is preferably 12 mm, the pegs 6 are embedded into the precast concrete plates 1, the lower surfaces of the precast concrete plates 1 are flush with the upper supporting surface of the upper flange of the steel beam, and the two ends of the upper flange of the steel beam are flush with the edges of the precast concrete plates 1.
In the above embodiment, preferably, the peg 6 is completely embedded in the precast concrete panel 1 and the lower surface of the precast concrete panel 1 is flush with the upper bearing surface of the steel beam upper flange; the two ends of the steel beam upper flange are flush with the edge of the precast concrete slab 1, bolt holes are formed in the two ends of the steel beam web plate of the H-shaped steel secondary beam 2, and the steel beam web plate is connected with the precast component main beam 3 through the primary and secondary beam connecting plate 7 and is fixed in the bolt holes of the steel beam web plate through high-strength bolts 9. Specifically, the upper surface welding of prefabricated component girder 3 has peg 6, and the welding has the stiffening rib that the edge flushed between the last lower flange of prefabricated component girder 3, and the girder steel web of H shaped steel secondary beam 2 aligns with the last flange and the stiffening rib of prefabricated component girder 3 to through primary and secondary roof beam connecting plate 7 with girder steel web and stiffening rib fixed connection.
Wherein, the two ends of the plate surface reinforcing steel bars 4 arranged in the precast concrete plate 1 extend out of the edge of the precast concrete plate 1 and are aligned with the edge of the precast member girder 3, and the plate bottom reinforcing steel bars 5 extending in the same direction are also aligned with the edge of the precast member girder 3. The prefabricated main beams 3 are also of an H-shaped steel structure, a stiffening rib is arranged in the middle of each prefabricated main beam 3, and the edge of the stiffening rib is aligned with the width of the upper flange and the width of the lower flange of the H-shaped steel, so that the combined members of the H-shaped steel secondary beams 2 and the prefabricated concrete slabs 1 can be aligned with the edges of the prefabricated main beams 3 and the stiffening ribs thereof. The primary and secondary beam connecting plates 7 are fixed with the steel beam webs and the stiffening ribs on two sides through high-strength bolts 9, so that the steel beam webs of the H-shaped steel secondary beam 2 and the stiffening ribs of the prefabricated main beam 3 can be connected into a whole through the primary and secondary beam connecting plates 7 to form a complete force transmission system.
In the above embodiment, preferably, the edges of the precast concrete panels 1 in the span direction are provided with a two-step structure, so that the edges of the lower steps where the panels of the precast concrete panels 1 in the span direction meet each other, and a slab joint is formed between the edges of the upper steps, so as to further pour concrete to form the concrete connection. In the use process, due to the connection effect of the reserved plate seams and the overhanging reinforcing steel bars, the whole body is formed in the plane, the whole effect is stronger, and the whole performance of the component is improved.
The upper portion of precast concrete board 1 is violently indulged two-way and is laid face reinforcing bar 4 along the face direction, the face reinforcing bar 4 both ends along span direction stretch out precast concrete board 1 edge and surpass lower floor's step edge, face reinforcing bar 4 both ends along the perpendicular to span direction align with precast concrete board 1's lower floor's step edge, precast concrete board 1's lower part is violently indulged two-way and is laid board end reinforcing bar 5 along the face direction, 5 both ends of board end reinforcing bar along span direction align with precast concrete board 1's lower floor's step edge, 5 both ends of board end reinforcing bar along horizontal span direction stretch out precast concrete board 1 edge. The plate surface reinforcing steel bars 4 and the plate bottom reinforcing steel bars 5 which extend out of the edges are arranged in the precast concrete plate 1, so that the additional reinforcing steel bars 10 can be added for binding the reinforcing steel bars, the width of a post-cast concrete belt is increased, and the whole effect is stronger.
In the above embodiment, it is preferable that the steel beam web of the H-beam sub-beam 2 is perforated to pass through the pipeline, while reducing the weight, but the perforation is performed while paying attention on the basis of not affecting the overall strength.
In the above embodiment, it is preferable that the portions of the slab surface reinforcing bars 4 and the slab bottom reinforcing bars 5 which protrude beyond the edge of the precast concrete slab 1 are not less than 50 mm.
As shown in fig. 3, the second connection scheme of the H-beam 2 and the precast concrete slab 1 in the above embodiment specifically includes:
In the second connection scheme of the H-shaped steel secondary beam 2 and the precast concrete plate 1, the upper flange of the steel beam of the H-shaped steel secondary beam 2 extends out of two end parts of the precast concrete plate 1 and is erected on a precast element main beam 3 of a precast element. Specifically, because two ends of the upper flange of the steel beam extend out of the edge of the precast concrete slab 1, the H-shaped steel secondary beam 2 does not need to be fixedly connected with the precast component main beam 3 through the primary and secondary beam connecting plate 7 as in the first scheme, and only needs to be partially overlapped on the precast component main beam 3 by the extending edge to form a complete force transmission system.
In the above two connection schemes of the H-beam 2 and the precast concrete slab 1, no matter the H-beam 2 is connected with the precast concrete slab 1 by the studs 6 or the upper flange and the upper half of the web of the steel beam are embedded in the precast concrete slab 1, a good combination effect can be formed, and the precast concrete slab 1 can help the upper flange of the H-beam 2 to be pressed, so that the size of the upper flange of the H-beam 2 can be reduced, and the height of the steel beam-floor slab combination can be reduced, thereby providing a higher space for a building.
The invention also provides a method for manufacturing the concrete floor secondary beam combined prefabricated part, which is applied to the concrete floor secondary beam combined prefabricated part in any one of the embodiments, and comprises the following steps: determining the position of a precast concrete plate template, and installing the precast concrete plate template in the direction that the upper surface of the precast concrete plate 1 faces downwards; and (3) inserting the H-shaped steel secondary beam 2 at a preset position to form the precast concrete plate 1 while pouring concrete in the precast concrete plate formwork.
In the above embodiment, preferably, the precast concrete slabs 1 are fixed or overlapped with the precast member girders 3 according to preset positions, the precast concrete slabs 1 are spliced with each other and concrete is poured between slab joints at the joints of the precast concrete slabs 1, and the joints of the precast member girders 3 and the columns 11 are connected through the girder-column connecting plates 8 and are poured with concrete to form a combined precast member with a flat surface.
According to the concrete floor secondary beam combination prefabricated part provided by the embodiment, in the specific implementation process, the implementation scheme is as follows:
1) as shown in fig. 4, in the first connection scheme of the H-beam 2 and the precast concrete slab 1, the precast concrete slab 1 is fabricated into the H-beam 2 and the precast member main beam 3 according to a common steel frame structure, the studs 6 are welded on the surfaces of the precast member main beam 3 and the upper flange of the secondary beam, and the studs 6 are 13mm and have a height of not less than 60 mm;
2) as shown in fig. 5, in the second connection scheme of the H-beam 2 and the precast concrete slab 1, the precast concrete slab 1 is fabricated into the H-beam 2 and the precast member main beam 3 according to a common steel frame structure, and only the stud 6 needs to be welded on the surface of the upper flange of the precast member main beam 3, wherein the stud 6 is 13mm and has a height not less than 60 mm; the upper flange of the secondary beam and the upper half part of the web plate are embedded into the concrete floor.
3) The prefabricating process of the concrete prefabricated part comprises the following steps: firstly, paying off, and determining the position of a template; the template is manufactured and vertically installed, then the steel bars are inserted, the steel bars are placed and bound according to the designed positions, the H-shaped steel beams are placed, and concrete is poured; the moisture maintenance of the concrete is very important for the strength increase and the improvement of various performances, so that the necessary maintenance must be ensured after the concrete is poured, and the form can be removed when the strength of the floor reaches more than 75 percent;
as shown in fig. 6, the precast concrete panel 1 is manufactured by placing a formwork with the upper surface of the precast concrete panel 1 facing downward, that is, a floor slab is under and a steel beam is on, which is opposite to the place of installation. By doing so, the upper surface of the floor slab can be directly contacted with the steel template, and the surface can be very flat without treatment. Due to the existence of the T-shaped groove, the formwork can be more easily erected when the H-shaped steel secondary beam 2 is manufactured upside down, and the H-shaped steel secondary beam can be more easily placed on the upper portion.
The bottom of the plate is the upper surface when the plate is poured, and the surface of the bottom of the plate is rough. The suspended ceiling can be directly made in a building generally, the use cannot be influenced due to the rough upper surface, and the processing can be avoided. In addition, at present, more and more buildings are not used for suspended ceilings, and the surface of the ceiling is specially roughened, so that diffuse reflection can be formed, and indoor echo is reduced.
4) Determining an arrangement scheme of H-shaped steel secondary beams 2 according to the distance between building upright columns 11, determining the width of a single precast concrete plate 1, wherein the width of the single precast concrete plate is not more than 2.4 m, the single precast concrete plate can be transported through an expressway to meet the requirements of prefabrication, transportation and hoisting, and reinforcing bars in the plate are determined according to the structure arrangement scheme and load calculation to meet the current standard requirement and are processed and manufactured by a prefabrication factory; the design scheme of the floor slab of the structure is determined, and the whole prefabricated floor slab can be directly prefabricated according to the original design.
5) The precast concrete plates 1 are divided into two types according to the connection scheme of the H-shaped steel secondary beam 2 and the precast concrete plate 1, in the span direction, one type is the precast concrete plate 1 with one side connected with the precast member main beam 3 and one side connected with the plate, and the other type is the precast concrete plate 1 with two side edges connected with the plate. The two types of plates have the same plate edge structure in the direction vertical to the span direction, are all arranged on the prefabricated member main beam 3, and have the arrangement length of 50 mm. The prefabricated combined secondary beam component is hoisted to a specified height and is placed on the prefabricated component main beam 3 along the direction vertical to the span direction, the upper plate surface steel bars 4 and the lower plate bottom steel bars 5 in the direction extend out of the edge of the prefabricated concrete plate 1 to form the beard steel bars, and the length of the beard steel bars is not less than 50 mm.
As shown in fig. 7 to 10, the plate edges of the first type plate in the span direction are configured as follows: and the side overlapped with the main beam 3 of the prefabricated part is not required to be designed into a step shape, the upper part and the lower part of the plate are aligned, and the width of the upright post 11 is larger than that of the main beam 3 of the prefabricated part, so that the plate is required to be provided with a concave angle to meet the assembly requirement. The width of the concave angle is the sum of the edge distance between the upright post 11 and the prefabricated member main beam 3 and the overlapping length, the plate surface steel bar 4 and the plate bottom steel bar 5 in the span direction extend out of the edge of the plate by not less than 50mm, and the tail ends of the plate surface steel bar and the plate bottom steel bar are flush; with board overlap joint one side (perpendicular to span direction promptly), owing to will form the concrete post-cast strip of broad to make the step form to the arrangement of connecting reinforcement, its upper step edge is apart from lower floor step edge width and is not less than 50mm, and board upper strata atress reinforcing bar stretches out upper step edge, and the length of stretching out is the width of lower floor step, thereby forms the slab joint in order to pour the concrete in board and board handing-over department.
The second type of plate is connected with the plate along both ends perpendicular to the span direction, and the structure of the second type of plate is consistent with that of the first type of plate and the overlapped side of the plate.
6) And measuring and determining the hoisting position of each plate, hoisting the plates one by one from one side to the other side, checking the position of the precast concrete slab 1 after the plates on one precast member girder 3 are completely hoisted, connecting the H-shaped steel girder with the precast member girder 3 through bolts after the position is determined, and only connecting the web plates to facilitate force transmission.
7) The beard reinforcing steel bars extending out of the two adjacent plate ends are connected with the beard reinforcing steel bars at the other end through the additional reinforcing steel bars 10 according to design requirements, and concrete cracking in the support area is prevented.
8) And after all or part of the composite beam on a certain floor is installed, adjusting the size to meet the design requirement. And at the joint of the plate and the beam, post-pouring concrete at the joint of the plate and the beam, wherein the strength of the concrete is consistent with that of the precast concrete floor slab, and is not lower than C40, and the upper surface of the post-poured concrete is flush with the precast slab surface, so that the elevation of the whole floor is consistent. And after the cast-in-place concrete is cured, curing the cast-in-place concrete in time to prevent the concrete from cracking. When the split joint between the floor slabs is too large or the cracking phenomenon occurs in local cast-in-place, the steel wire mesh can be laid on the floor slab surface and then the leveling layer is made.
According to the records of the embodiments, in order to accelerate the popularization of the steel structure assembly type and change the problem of incongruity between the steel structure and the cast-in-place of concrete in the modern industry, the combined beam technology and the steel frame structure are combined, the industrialization technology of the combined beam and the steel frame structure is realized, the industrialization process of the steel structure is accelerated, the connecting part between the floor slabs in the combined beam adopts the cast-in-place concrete mode, all the floor slabs are spliced into a complete floor system structure again, the existing function of the building structure is ensured, the whole structure stress system is more complete, the anti-seismic performance is more excellent, the construction period is greatly shortened, and the pouring amount of the concrete on site is reduced.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A concrete floor secondary beam combined prefabricated part is characterized by comprising: a precast concrete plate and an H-shaped steel secondary beam,
the precast concrete plate is formed by pouring concrete;
and the upper surface of the upper flange of the steel beam of the H-shaped steel secondary beam is welded with a stud, and the stud is embedded on the lower surface of the precast concrete slab.
2. The concrete floor secondary beam composite precast element of claim 1, wherein the peg is completely embedded in the precast concrete plate and the lower surface of the precast concrete plate is flush with the upper bearing surface of the steel beam upper flange;
the two ends of the steel beam upper flange are flush with the edges of the precast concrete plates, bolt holes are formed in the two ends of a steel beam web plate of the H-shaped steel secondary beam, and the steel beam web plate is connected with the precast member main beam through a primary beam connecting plate and a secondary beam connecting plate and is fixed in the bolt holes of the steel beam web plate through high-strength bolts.
3. The concrete floor secondary beam combination prefabricated part according to claim 1 or 2, wherein edges of the precast concrete plates along the span direction are arranged into a two-layer step structure, so that the edges of lower steps where the plate surfaces of the precast concrete plates along the span direction are connected, and a plate seam is formed between the edges of upper steps, so as to further pour concrete to form a concrete connecting part;
the upper portion of the precast concrete slab is transversely and longitudinally distributed with slab reinforcing steel bars along the slab direction, the two ends of the slab reinforcing steel bars along the span direction extend out of the edge of the precast concrete slab and exceed the edge of the lower step, the two ends of the slab reinforcing steel bars along the direction perpendicular to the span direction are aligned with the edge of the lower step of the precast concrete slab, the lower portion of the precast concrete slab is transversely and longitudinally distributed with slab bottom reinforcing steel bars along the slab direction, the two ends of the slab bottom reinforcing steel bars along the span direction are aligned with the edge of the lower step of the precast concrete slab, and the two ends of the slab bottom reinforcing steel bars along the transverse span direction extend out of the edge of the precast concrete slab.
4. The concrete floor sub-beam composite precast member as set forth in claim 1 or 2, wherein the steel beam web of the H-type steel sub-beam is perforated to pass through a pipeline.
5. The concrete floor secondary beam combined prefabricated part according to claim 2, wherein studs are welded on the upper surface of the main beam of the prefabricated part, stiffening ribs with flush edges are welded between the upper flange and the lower flange of the main beam of the prefabricated part, the steel beam web of the H-shaped steel secondary beam is aligned with the upper flange and the stiffening ribs of the main beam of the prefabricated part, and the steel beam web and the stiffening ribs are fixedly connected through the primary and secondary beam connecting plates.
6. The precast member of concrete floor slab and secondary beam combination of claim 3, wherein the portion of the slab face reinforcing steel bar and the slab bottom reinforcing steel bar extending out of the edge of the precast concrete slab is not less than 50 mm.
7. A concrete floor sub-beam assembly precast member, characterized in that, compared with the concrete floor sub-beam assembly precast member of any one of claims 1 to 6:
the upper flange of the steel beam of the H-shaped steel secondary beam is not provided with the stud,
and the upper flange of the steel beam and the upper half part of the steel beam web plate of the H-shaped steel secondary beam are embedded into the precast concrete plate.
8. The concrete floor secondary beam composite precast element according to claim 7, wherein additional steel bars are welded to both sides of the upper portion of the steel beam web of the H-shaped steel secondary beam, both ends of the upper flange of the steel beam extend out of the edge of the precast concrete slab, and the extending portion is lapped on the main beam of the precast element.
9. A method for manufacturing a concrete floor secondary beam combined prefabricated component, which is applied to the concrete floor secondary beam combined prefabricated component of any one of claims 1 to 8, and is characterized by comprising the following steps:
determining the position of a precast concrete plate template, and installing the precast concrete plate template in a direction that the upper surface of the precast concrete plate faces downwards;
and inserting an H-shaped steel secondary beam at a preset position while pouring concrete in the precast concrete slab template to form the precast concrete slab.
10. The method for manufacturing the concrete floor secondary beam combined prefabricated part according to claim 9, wherein the precast concrete plates are fixed or overlapped with the precast member main beams according to preset positions, the precast concrete plates are spliced with each other, concrete is poured among plate gaps at the joints of the precast concrete plates, and concrete is poured at the joints of the precast member main beams and the upright columns to form the combined prefabricated part with a flat surface.
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| CN202010238752.7A CN111424869A (en) | 2020-03-30 | 2020-03-30 | Concrete floor secondary beam combined prefabricated part and manufacturing method |
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| CN202010238752.7A CN111424869A (en) | 2020-03-30 | 2020-03-30 | Concrete floor secondary beam combined prefabricated part and manufacturing method |
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