CN111424869A - Concrete floor secondary beam combined prefabricated part and manufacturing method - Google Patents

Abstract

The invention discloses a composite prefabricated component of a concrete floor sub-beam and a manufacturing method, wherein the prefabricated component comprises: a prefabricated concrete slab and an H-shaped steel secondary beam, 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 The studs are welded, and the studs are embedded in the lower surface of the precast concrete slab. Through the technical scheme of the present invention, the combined prefabricated components are hoisted as a whole, assembled into a whole by reserved steel bars and connected with the main beam of the structure, and a small amount of cast-in-place concrete is used to form an integral floor system, which reduces the tedious process of on-site formwork and avoids on-site pouring. The strength and rigidity of the concrete and floor sub-beam composite prefabricated components are significantly improved, the floor will not be damaged due to the influence of its own weight during hoisting, and the overall performance of the components is improved.

Description

Concrete floor sub-beam composite prefabricated member and fabrication method

technical field

The invention relates to the technical field of building structures, in particular to a concrete floor sub-beam composite prefabricated component and a manufacturing method of a concrete floor sub-beam composite prefabricated component.

Background technique

At present, when the steel frame is subjected to a horizontal force, the maximum bending moment of the main beam of the steel prefabricated member is the negative bending moment at the support. At the cross-section of the support, the upper part is tensioned and the lower part is compressed. Since the tensile capacity of concrete is small, and the steel bars arranged in the slab cannot bear this tensile force, when designing the strong column and weak beam of the steel frame, the combined effect of the main beam of the prefabricated member and the floor slab is not considered, and the negative bending at the node is not considered. The moment is all borne by the main beam of the prefabricated member. However, in the traditional cast-in-place concrete floor, the concrete and steel bars of the floor will bear part of the negative bending moment, and the slab does have a certain combined effect with the main beam of the prefabricated member, so when an earthquake occurs, the damage that generally occurs is that of strong beams and weak columns. destroy.

The traditional cast-in-place floor, the floor and the secondary beam can be combined without stress, but as a cast-in-place structure, the floor and the secondary beam are combined under stress, and the combined effect is weak. Considering the combination is unsafe, the secondary beam has a high section and large deflection. . In addition, the cast-in-place formwork support process is cumbersome, and the concrete curing conditions are limited, which is prone to environmental pollution.

SUMMARY OF THE INVENTION

Aiming at at least one of the above problems, the present invention provides a concrete floor sub-beam composite prefabricated component and a manufacturing method. By adopting factory prefabrication technology for the prefabricated concrete slab and the H-shaped steel sub-beam, the tedious process of on-site formwork is reduced, avoiding the need for Too much concrete is poured on site, and the steel beam and concrete form a reliable combination without stress, which significantly improves the strength and stiffness of the steel beam, and the floor slab will not be damaged due to the influence of its own weight during hoisting. The connection function makes it a whole in the plane and improves the overall performance of the component.

In order to achieve the above purpose, the present invention provides a concrete floor sub-beam composite prefabricated component, including: a prefabricated concrete slab and an H-shaped steel secondary beam, the prefabricated concrete slab is formed by pouring concrete; the steel beam upper wing of the H-shaped steel secondary beam The upper surface of the edge is welded with studs, and the studs are embedded in the lower surface of the precast concrete slab.

In the above technical solution, preferably, the studs are completely embedded in the precast concrete slab and the lower surface of the precast concrete slab is flush with the upper bearing surface of the upper flange of the steel beam; the upper flange of the steel beam Both ends of the steel beam are flush with the edge of the prefabricated concrete slab, bolt holes are provided at both ends of the steel beam web of the H-shaped steel secondary beam, and the steel beam web is connected to the main beam of the prefabricated member through the primary and secondary beam connecting plates. and fixed in the bolt holes of the steel beam web by high-strength bolts.

In the above technical solution, preferably, the edge of the precast concrete slab along the span direction is set as a two-layer stepped structure, so that the edge of the lower step and the edge of the upper step are connected where the board surfaces of the precast concrete slab meet along the span direction. A slab gap is formed between the slabs to further pour concrete to form a concrete connection part; the upper part of the precast concrete slab is arranged with slab reinforcement along the slab surface horizontally, vertically and in both directions, and the two ends of the slab reinforcement along the span direction protrude from the precast concrete. The edge of the slab extends beyond the edge of the lower step, and the two ends of the slab surface reinforcement perpendicular to the span direction are aligned with the edge of the lower step of the precast concrete slab, and the bottom of the prefabricated concrete slab is arranged horizontally and vertically along the slab surface direction. Steel bars, the two ends of the bottom 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 bottom steel bars along the transverse span direction protrude from the edge of the precast concrete slab.

In the above technical solution, preferably, holes are opened on the steel beam web of the H-shaped steel secondary beam to pass through the pipeline.

In the above technical solution, preferably, the upper surface of the main beam of the prefabricated member is welded with studs, the upper and lower flanges of the main beam of the prefabricated member are welded with stiffeners with flush edges, and the H-shaped steel secondary beam is welded. The steel beam web is aligned with the upper flange of the prefabricated main beam and the stiffener, and the steel beam web and the stiffener are fixedly connected through the primary and secondary beam connecting plates.

In the above technical solution, preferably, the part of the slab surface reinforcement and the slab bottom reinforcement extending beyond the edge of the precast concrete slab is not less than 50 mm.

The present invention also provides a concrete floor sub-beam composite prefabricated component, compared with the concrete floor sub-beam composite prefabricated component described in any one of the above technical solutions: the upper flange of the steel beam of the H-shaped steel sub-beam is not provided with studs, The upper flange of the steel beam and the upper half of the steel beam web of the H-shaped steel secondary beam are pre-embedded in the precast concrete slab.

In the above technical solution, preferably, additional reinforcing bars are welded on both sides of the upper part of the steel beam web of the H-shaped steel secondary beam, the two ends of the upper flange of the steel beam protrude from the edge of the precast concrete slab, and the protruding part is erected on the main beam of the prefabricated member.

The present invention also provides a method for making a concrete floor sub-beam composite prefabricated member, which is applied to the concrete floor sub-beam composite prefabricated member according to any one of the above technical solutions. The prefabricated formwork of the concrete slab is installed with the upper surface of the concrete slab facing downward; while the concrete is poured in the prefabricated concrete slab formwork, the H-shaped steel secondary beam is inserted at a preset position to form the prefabricated concrete slab.

In the above technical solution, preferably, the prefabricated concrete slabs are fixed or overlapped with the main beams of the prefabricated components according to a preset position, the prefabricated concrete slabs are spliced with each other and the slab joints of the prefabricated concrete slabs Concrete is poured between, and concrete is poured at the connection between the main beam of the prefabricated component and the column to form a combined prefabricated component with a flush plate surface.

Compared with the prior art, the beneficial effects of the present invention are:

1) The present invention adopts factory prefabrication technology for prefabricated concrete slabs and H-shaped steel secondary beams in combined prefabricated components, which are prefabricated and hoisted as a whole in the factory. Concrete is poured on site, which can not only improve concrete curing conditions, but also reduce environmental pollution.

2) Due to the prefabrication of prefabricated components in the factory, the construction speed and quality of concrete can be greatly improved. The steel beam and concrete form a reliable combination under no stress, and the combination is strong. Under the same external load, the strength of the steel beam and Stiffness is significantly improved. For the deflection problem of the floor slab and the secondary beam in the construction stage before the concrete hardens, the deflection requirements of the construction stage and the normal use stage can be achieved by increasing the size of the prefabricated slab or using the reverse arch effect. There are holes in the web of the steel beam, which is convenient for pipeline laying, which can solve the problem that the fully prefabricated floor is not good for pre-embedding pipelines, and can also effectively reduce the self-weight and save steel materials.

3) On-site hoisting, when there is no secondary beam, there is no support in the middle of the larger pure concrete floor, which is easily damaged during hoisting. When the present invention is supported by secondary beams, the floor slab will not be damaged due to the influence of its own weight during hoisting, and a small amount of concrete is poured at the connection of the precast concrete slab. As a whole, it can bear part of the bending moment out of plane, and improve the overall performance of the component.

4) Whether the H-beam secondary beam is connected to the precast concrete slab by means of studs or the upper flange of the steel beam and the half part of the web are embedded in the precast concrete slab, a good combined effect can be formed, and the concrete can help the upper flange of the secondary beam to be compressed, As a result, the size of the upper flange of the steel secondary beam can be reduced, and the height of the composite prefabricated component of the floor slab secondary beam can be reduced to provide a higher space for the building.

5) In the area where the main beam and the column are connected to the floor slab, the main beam and the floor slab do not form a good combination due to the post-cast concrete, and the cross-sectional resistance moment of the main beam is small, which is conducive to ensuring the mechanism of strong columns and weak beams. However, the floor slab and the secondary beam have a good combination effect, and the secondary beam and the main beam have a reliable connection. Even if the floor slab and the main beam do not have a good combination effect, the floor slab will not fall off, which ensures a good assembly frame system. seismic performance.

Description of drawings

1 is a schematic diagram of the overall splicing structure of a concrete floor sub-beam composite prefabricated member disclosed in an embodiment of the present invention;

2 is a schematic structural diagram of a precast concrete slab-H-shaped steel secondary beam structural member disclosed in an embodiment of the present invention;

3 is a schematic structural diagram of a precast concrete slab-H-shaped steel secondary beam structural member disclosed in another embodiment of the present invention;

4 is a schematic diagram of the connection form of the main beam and the secondary beam of the prefabricated member disclosed in the embodiment shown in FIG. 2;

5 is a schematic diagram of the connection form of the main beam and the secondary beam of the prefabricated member disclosed in the embodiment shown in FIG. 3;

6 is a schematic diagram of the overlapping structure of a prefabricated component and a main beam of the prefabricated component disclosed in an embodiment of the present invention;

7 is a cross-sectional view of the overlapping structure of the long side of the precast concrete slab and the main beam of the precast member disclosed in the embodiment shown in FIG. 2;

8 is a cross-sectional view of the overlapping structure of the long side of the precast concrete slab and the main beam of the precast member disclosed in the embodiment shown in FIG. 3;

9 is a cross-sectional view of the overlapping structure of the short side of the precast concrete slab and the main beam of the precast member disclosed in the embodiment shown in FIG. 2;

FIG. 10 is a cross-sectional view of the overlapping structure of the short side of the precast concrete slab and the main beam of the precast member disclosed in the embodiment shown in FIG. 3 .

In the figure, the corresponding relationship between each component and the reference sign is:

1. Precast concrete slab, 2. H-beam secondary beam, 3. Precast member main beam, 4. Slab surface reinforcement, 5. Slab bottom reinforcement, 6. Stud, 7. Primary and secondary beam connecting plate, 8. Main beam column Connecting plate, 9. High-strength bolts, 10. Additional reinforcing bars, 11. Upright columns.

Detailed ways

In order to make the purposes, 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 accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

Below in conjunction with accompanying drawing, the present invention is described in further detail:

As shown in FIG. 1 , a concrete floor sub-beam composite prefabricated component provided according to the present invention includes: a prefabricated concrete slab 1 and an H-shaped steel secondary beam 2, wherein the prefabricated concrete slab is formed by pouring concrete; the H-shaped steel sub-beam The upper surface of the upper flange of the steel beam of the beam is welded with studs, and the studs are embedded in the lower surface of the precast concrete slab.

In this embodiment, by adopting the factory prefabrication technology for the precast concrete slab 1 and the H-shaped steel secondary beam 2, the tedious process of on-site formwork support is reduced, and excessive concrete pouring on site is avoided, and the steel beam and the concrete form a reliable connection under no stress. Combined action, the strength and stiffness of the steel beams are significantly improved, the floor will not be damaged due to the influence of its own weight during hoisting, and the overall performance of the components is improved. For the deflection problem of the floor slab and the secondary beam in the construction stage before the concrete hardens, the deflection requirements of the construction stage and the normal use stage can be achieved by increasing the size of the precast concrete slab 1 or using the reverse arch effect. On-site hoisting, when there is no secondary beam, there is no support in the middle of the larger pure concrete floor slab, which is easily damaged during hoisting. When supported by secondary beams, the floor slab will not be damaged due to its own weight during hoisting.

As shown in FIG. 2 , the connection scheme 1 of the H-shaped steel secondary beam 2 and the precast concrete slab 1 in the above embodiment specifically includes:

Two rows of studs 6 are welded on the supporting surface of the upper flange of the steel beam of the H-shaped steel secondary beam 2. The height of the studs 6 is preferably 12 mm. The studs 6 are pre-embedded in the precast concrete slab 1. The upper bearing surface of the upper flange of the beam is flush, and both ends of the upper flange of the steel beam are flush with the edge of the precast concrete slab 1 .

In the above embodiment, preferably, the studs 6 are completely embedded in the precast concrete slab 1 and the lower surface of the precast concrete slab 1 is flush with the upper bearing surface of the upper flange of the steel beam; both ends of the upper flange of the steel beam are flush with the precast concrete slab The edges of 1 are flush, and the two ends of the steel beam web of the H-shaped steel secondary beam 2 are provided with bolt holes. in the bolt holes of the web. Specifically, studs 6 are welded on the upper surface of the prefabricated main beam 3, stiffeners with flush edges are welded between the upper and lower flanges of the prefabricated main beam 3, and the steel beam web of the H-shaped steel secondary beam 2 is connected to the prefabricated member. The upper flange of the main beam 3 is aligned with the stiffener, and the steel beam web and the stiffener are fixedly connected through the primary and secondary beam connecting plates 7 .

The steel bar 4 on the surface of the precast concrete slab 1 extends from the edge of the prefabricated concrete slab 1 and is aligned with the edge of the main beam 3 of the prefabricated member. Align. The main girder 3 of the prefabricated member is also an H-shaped steel structure. The middle of the main girder of the prefabricated member 3 is provided with a stiffening rib, and the edge of the stiffening rib is aligned with the width of the upper flange and the lower flange of the H-shaped steel. The joining elements of the concrete slab 1 can be aligned with the edges of the prefabricated element main beams 3 and their stiffeners. The primary and secondary beam connecting plates 7 and the steel beam webs and stiffeners on both sides are fixed by high-strength bolts 9, so that the steel beam webs of the H-shaped steel secondary beam 2 and the stiffeners of the prefabricated main beam 3 can be connected through the primary and secondary beams. The plate 7 is connected as a whole to form a complete force transmission system.

In the above embodiment, preferably, the edge of the precast concrete slab 1 along the span direction is set as a two-layer stepped structure, so that the edge of the lower step of the precast concrete slab 1 along the span direction is connected, and the edge of the upper step is formed. Slab joints to further pour concrete to form concrete joints. In the process of use, due to the connection between the reserved plate seam and the overhanging steel bar, it becomes a whole in the plane, which makes the overall effect stronger and improves the overall performance of the component.

The upper part of the precast concrete slab 1 is provided with slab reinforcement bars 4 horizontally, vertically and bidirectionally along the slab surface direction. The two ends of the steel bar 4 are aligned with the edge of the lower step of the precast concrete slab 1. The lower part of the precast concrete slab 1 is arranged with the bottom steel bar 5 along the horizontal and vertical directions of the slab surface. The edges of the lower steps are aligned, and the two ends of the steel bars 5 at the bottom of the slab along the transverse span direction protrude from the edge of the precast concrete slab 1 . In the precast concrete slab 1, the surface reinforcement bars 4 and the slab bottom reinforcement bars 5 are arranged protruding from the edge, which can not only increase the additional reinforcement bars 10 to bind the reinforcement bars, but also increase the width of the post-cast concrete belt, so that the overall effect is stronger.

In the above embodiment, preferably, holes are opened on the steel beam web of the H-shaped steel secondary beam 2 to pass through the pipeline, and the self-weight can be reduced at the same time, but attention should be paid to the opening without affecting its overall strength. .

In the above-mentioned embodiment, preferably, the part of the slab surface reinforcement 4 and the slab bottom reinforcement 5 protruding from the edge of the precast concrete slab 1 is not less than 50 mm.

As shown in FIG. 3 , the connection scheme 2 of the H-shaped steel secondary beam 2 and the precast concrete slab 1 in the above embodiment specifically includes:

Additional reinforcing bars 10 are welded on both sides of the upper part of the steel beam web of the H-shaped steel secondary beam 2, the upper flange of the steel beam and the upper half of the steel beam web are pre-buried in the precast concrete slab 1, and both ends of the upper flange of the steel girder protrude from the precast concrete slab 1. the edge of.

In the second connection scheme between the H-shaped steel secondary beam 2 and the precast concrete slab 1 , the upper flange of the steel beam of the H-shaped steel secondary beam 2 protrudes from the two ends of the precast concrete slab 1 and is placed on the precast member main beam 3 of the precast member. Specifically, since both ends of the upper flange of the steel beam protrude from the edge of the precast concrete slab 1, the H-shaped steel secondary beam 2 does not need to be bolted and connected to the precast member main beam 3 through the primary and secondary beam connecting plates 7 as in the scheme 1, and only needs its The protruding edge portion is overlapped on the main beam 3 of the prefabricated member, and a complete force transmission system can be formed.

In the above two connection schemes of the H-shaped steel secondary beam 2 and the precast concrete slab 1, whether the H-shaped steel secondary beam 2 is connected with the precast concrete slab 1 by means of the studs 6 or the upper flange of the steel beam and the upper half of the web are embedded in the precast concrete In the plate 1, a good combination can be formed. The precast concrete plate 1 can help the upper flange of the H-shaped steel secondary beam 2 to be compressed, thereby reducing the size of the upper flange of the H-shaped steel secondary beam 2 and reducing the steel beam at the same time. -The height of the slab assembly, which provides a higher space for the building.

The present invention also provides a method for making a concrete floor sub-beam composite prefabricated member, which is applied to the concrete floor sub-beam composite prefabricated member according to any one of the above embodiments, including: determining the position of the prefabricated formwork of the concrete slab, and using the prefabricated concrete slab The upper surface of 1 is installed with the prefabricated formwork of the concrete slab in a downward direction; while the concrete is poured in the prefabricated concrete slab formwork, the H-shaped steel secondary beam 2 is inserted at the preset position to form the prefabricated concrete slab 1 .

In the above embodiment, preferably, the precast concrete slab 1 is fixed or overlapped with the main beam 3 of the prefabricated member according to the preset position, and the precast concrete slabs 1 are spliced with each other and poured between the slab joints where the precast concrete slabs 1 meet. For concrete, the main beam 3 of the prefabricated component is connected with the column 11 through the main beam-column connecting plate 8 and concrete is poured to form a combined prefabricated component with a flush plate surface.

According to the concrete floor sub-beam composite prefabricated component provided by the above embodiment, in the specific implementation process, the implementation is as follows:

1) As shown in Figure 4, in the connection scheme 1 of the above-mentioned H-shaped steel secondary beam 2 and the precast concrete slab 1, the precast concrete slab 1 member is made of the H-shaped steel secondary beam 2 and the precast member main beam 3 according to the ordinary steel frame structure. The main beam 3 and the upper flange surface of the secondary beam are welded with studs 6, and the studs 6 are 13mm and the height is not less than 60mm;

2) As shown in Figure 5, in the connection scheme 2 of the above-mentioned H-shaped steel secondary beam 2 and the precast concrete slab 1, the precast concrete slab 1 member is made of the ordinary steel frame structure to make the H-shaped steel secondary beam 2 and the prefabricated member main beam 3, only need Weld studs 6 on the surface of the upper flange of the prefabricated main beam 3, the stud 6 is 13mm, and the height is not less than 60mm; the upper flange of the secondary beam and the upper half of the web are buried in the concrete floor.

3) The prefabrication process of the specific prefabricated components is as follows: first lay out the line to determine the position of the formwork; erect and install the formwork, then insert the reinforcement, place the reinforcement according to the design position and bind it, place the H-shaped steel beam, and pour the concrete; Concrete moisturizing and curing It is very important to increase its strength and improve various properties. Therefore, after the concrete is poured, the necessary maintenance must be ensured, and the formwork can be removed when the floor strength reaches more than 75%;

As shown in FIG. 6 , the manufacturing method of the precast concrete slab 1 is to set the formwork with the upper surface of the precast concrete slab 1 facing down, that is, the floor slab is down and the steel beam is up, which is opposite to the position during installation. In this way, the surface of the floor can be directly contacted with the steel formwork, and the surface will be very flat, and no further treatment is required. Due to the existence of T-shaped grooves, it is easier to support the formwork by inverting it, and it is easier to place the H-shaped steel secondary beam 2 in the upper part.

The bottom of the slab is the upper surface during pouring, and its surface will be rough. Generally, the ceiling will be directly used in the building, and the rough upper surface will not affect the use, so there is no need to do any treatment. In addition, more and more buildings now do not have suspended ceilings, and the roof surface is deliberately made rough, which can form diffuse reflection and reduce indoor echoes.

4) Determine the layout plan of the H-shaped steel secondary beam 2 according to the spacing of the building columns 11, and determine the width of a single precast concrete slab 1. The width of a single slab is not greater than 2.4 meters, which can be transported by expressway to meet the requirements of prefabrication, transportation, and hoisting. According to the requirements of the structure layout and load calculation, the reinforcement in the slab is determined to meet the requirements of the current specification, and then handed over to the prefabrication factory for processing and production; the floor design plan of the structure is determined, and the whole slab can be prefabricated directly according to the original design. prefab.

5) The precast concrete slab 1 is divided into two types according to the connection scheme of the above-mentioned H-shaped steel secondary beam 2 and the precast concrete slab 1. In the span direction, one side of the slab is connected to the main beam 3 of the prefabricated member, and one side is connected to the slab. The other type is the precast concrete slab 1 in which the edges on both sides of the slab are connected to the slab. These two types of panels have the same structure at the edge of the panels perpendicular to the span direction, and are placed on the main beam 3 of the prefabricated member with a length of 50 mm. The prefabricated composite secondary beam member is hoisted to a specified height, and rests on the prefabricated member main beam 3 along the direction perpendicular to the span. The upper deck surface reinforcement 4 and the lower deck bottom reinforcement 5 in this direction both protrude from the edge of the precast concrete slab 1 to form a beard reinforcement. , the length of the beard steel bar is not less than 50mm.

As shown in Fig. 7 to Fig. 10, the plate edge structure of the first type of plate along the span direction is as follows: the side that overlaps with the main beam 3 of the prefabricated member does not need to be designed as a step, and the upper part of the plate is aligned with the lower edge, because the column 11 The width is larger than that of the main beam 3 of the prefabricated member, so the plate needs to be provided with a concave corner to meet the assembly requirements. The width of the concave corner is the distance between the column 11 and the main beam 3 of the prefabricated member plus the overlapping length, and the steel bars 4 and 5 at the bottom of the slab in the span direction protrude from the edge of the slab by not less than 50mm, and the ends are flush; overlap with the slab. On one side (that is, perpendicular to the span direction), due to the need to form a wider concrete post-casting belt, and to facilitate the arrangement of connecting steel bars, it is made into a step shape, and the width of the upper step edge is not less than 50mm from the lower step edge, and the upper layer of the board is stressed. The steel bars protrude from the edge of the upper step by the width of the lower step, thereby forming a slab joint at the junction of the slab for pouring concrete.

Both ends of the second type of board are connected with the board along the span direction perpendicular to the span, and its structure is consistent with the structure of the overlapped side of the first type of board and the board.

6) Measure and determine the hoisting position of each slab, and hoist it one by one from one side to the other. When all slabs on the main beam 3 of a prefabricated member are hoisted, check the position of the precast concrete slab 1. The H-shaped steel beam and the main beam 3 of the prefabricated member are connected by bolts, and only the web is connected to facilitate the transmission of force.

7) According to the design requirements, the beard steel bar protruding from the end of the adjacent two plates and the beard steel bar at the other end are connected by the additional steel bar 10 to prevent the concrete from cracking in the support area.

8) After all or part of the composite beams of a certain floor are installed, adjust the size to meet the design requirements. At the junction of slab and beam, concrete is poured after slab and slab. The strength of concrete is the same as that of precast concrete floor slab and the strength is not lower than C40. Consistent. After the cast-in-place concrete is cured, it should be maintained in time to prevent the concrete from cracking. When the joints between the floors are too large or the local cast-in-place cracks occur, the steel mesh can be laid on the floor surface and then the leveling layer can be made.

According to the records of the above embodiments, in order to speed up the promotion of the prefabricated steel structure, and at the same time to change the problem of the incongruity between the steel structure and the cast-in-place concrete in the modern industry, the present invention combines the composite beam technology with the steel frame structure, and realizes both The industrialization technology has accelerated the process of industrialization of the steel structure. The connection between the floor and the floor in the composite beam is cast-in-place concrete. function, so that the overall structural stress system is more complete, the seismic performance is more superior, and the construction period is greatly shortened, and the amount of on-site concrete pouring is reduced.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. a concrete floor sub-beam composite prefabricated member is characterized in that, comprising: prefabricated concrete slab and H-shaped steel sub-beam, The precast 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 studs, and the studs are embedded in the lower surface of the precast concrete slab. 2 . The composite prefabricated component of concrete floor sub-beam according to claim 1 , wherein the studs are completely embedded in the prefabricated concrete slab and the lower surface of the prefabricated concrete slab is connected to the upper flange of the steel beam. 3 . The upper bearing surface is flush; The two ends of the upper flange of the steel beam are flush with the edge of the precast concrete slab, the two ends of the steel beam web of the H-shaped steel secondary beam are provided with bolt holes, and the steel beam web and the prefabricated main beam pass through the primary and secondary beams. The beam connecting plates are connected and fixed in the bolt holes of the steel beam web by high-strength bolts. 3. The concrete floor sub-beam composite prefabricated member according to claim 1 or 2, wherein the edge of the prefabricated concrete slab along the span direction is set as a two-layer stepped structure, so that the prefabricated concrete slab along the span direction Where the slabs meet, the edges of the lower steps are connected, and the edges of the upper steps are formed with slab joints, so as to further pour concrete to form a concrete connection part; The upper part of the prefabricated concrete slab is arranged with slab surface reinforcement along the slab surface direction, both ends of the slab surface reinforcement bar along the span direction protrude from the edge of the prefabricated concrete slab and beyond the edge of the lower step, along the direction perpendicular to the span direction. The two ends of the steel bars on the slab are aligned with the edge of the lower step of the precast concrete slab, and the lower part of the prefabricated concrete slab is provided with slab bottom steel bars along the horizontal and vertical directions of the slab surface. The edges of the lower steps of the precast concrete slab are aligned, and the two ends of the steel bars at the bottom of the slab along the transverse span direction protrude from the edge of the precast concrete slab. 4 . The composite prefabricated component of concrete floor sub-beams according to claim 1 or 2 , wherein the steel beam webs of the H-shaped steel sub-beams have holes to pass through the pipelines. 5 . 5 . The composite prefabricated component of concrete floor and secondary beams according to claim 2 , wherein the upper surface of the main beam of the prefabricated component is welded with studs, and the upper and lower flanges of the main beam of the prefabricated component are welded with edges. Flush stiffeners, the steel beam webs of the H-shaped steel secondary beams are aligned with the upper flanges and stiffeners of the prefabricated main beams, and the steel beam webs and the stiffeners are connected by the primary and secondary beam connecting plates. The stiffening ribs are fixedly connected. 6 . The composite prefabricated component of sub-beams of concrete floor according to claim 3 , characterized in that, the part of said slab surface reinforcement and said slab bottom reinforcement extending beyond the edge of said prefabricated concrete slab is not less than 50 mm. 7 . 7. A concrete floor sub-beam composite prefabricated member, characterized in that, compared to the concrete floor sub-beam composite prefabricated member described in 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 studs, The upper flange of the steel beam and the upper half of the steel beam web of the H-shaped steel secondary beam are pre-embedded in the precast concrete slab. 8 . The composite prefabricated component of concrete floor sub-beam according to claim 7 , wherein additional steel bars are welded on both sides of the upper part of the steel beam web of the H-shaped steel sub-beam, and both ends of the upper flange of the steel beam protrude. 9 . The protruding part of the edge of the prefabricated concrete slab is placed on the main beam of the prefabricated member. 9. A method for making a concrete floor sub-beam composite prefabricated member, applied to the concrete floor sub-beam composite prefabricated member as claimed in any one of claims 1 to 8, characterized in that, comprising: determining the position of the prefabricated formwork of the concrete slab, and installing the prefabricated formwork of the concrete slab with the upper surface of the prefabricated concrete slab facing downward; While pouring concrete in the prefabricated formwork of the concrete slab, insert H-shaped steel secondary beams at preset positions to form the prefabricated concrete slab. 10. The method for manufacturing a concrete floor sub-beam composite prefabricated member according to claim 9, wherein the prefabricated concrete slab is fixed or overlapped with the prefabricated member main beam according to a preset position, and the prefabricated concrete slab is between Splicing each other and pouring concrete between the slab joints of the prefabricated concrete slabs, pouring concrete at the connection between the prefabricated component main beam and the upright column, to form a combined prefabricated component with a flush slab surface.

Images