CN218643645U - Full-assembly type reinforced concrete floor connected by steel-concrete combined structure - Google Patents

Abstract

The utility model discloses a fully assembled reinforced concrete floor slab connected by a steel-concrete composite structure. Including prefabricated units, the main body is reinforced concrete prefabricated slabs, including double-layer bidirectional steel mesh and its poured concrete; Arranged in parallel, the main and secondary direction steel bars are vertically connected by tie bars; the main and secondary channel steel components are set in the prefabricated unit, and part of the main and secondary channel steel components are buried in concrete and connected with the main and secondary direction steel bar groups , and the other protrudes from the concrete to connect with the load-bearing beam. The construction operation of the fully assembled reinforced concrete floor slab described in the utility model is convenient, efficient, green, and environmentally friendly. The structural performance of the cast-in-place reinforced concrete floor slab is relatively high in comprehensive cost performance.

Description

A fully assembled reinforced concrete floor slab connected by steel-concrete composite structure

technical field

The utility model relates to a prefabricated reinforced concrete floor slab for construction engineering and a connection method thereof, in particular to a fully assembled reinforced concrete floor slab connected by a steel-concrete composite structure.

Background technique

The main component of the current prefabricated reinforced concrete structure is the prefabricated reinforced concrete floor, mainly including reinforced truss floor deck, reinforced truss pc floor deck (laminated slab) and removable bottom formwork reinforced truss floor deck and other floor forms.

The current prefabricated reinforced concrete slab only makes partial changes to the cast-in-place reinforced concrete slab, that is, the steel mesh in the cast-in-place reinforced concrete slab is changed to a steel truss, and the bottom formwork of the cast-in-place reinforced concrete slab is changed to a profiled steel plate, a detachable formwork or There are still a large number of laying and binding of steel bars on the surface of the slab and on-site pouring of a large amount of concrete, etc., and the phenomenon of environmental pollution caused by large-scale on-site wet operations cannot be eliminated. There is still a large gap in the target.

How to make the prefabricated reinforced concrete floor have the structural mechanical properties of the fully cast-in-place reinforced concrete floor, and at the same time realize the fully prefabricated and fully assembled construction is the goal pursued by the industry. As far as the current research and development achievements are concerned, the connection between fully prefabricated reinforced concrete floors has its own characteristics but also has its own problems, which are reflected in the mechanical performance and design: either the anchorage length of the reinforcement or the lap length of the reinforcement is not enough, or the transmission of the reinforcement is insufficient. The force path is not clear, or the additional stress concentration in the connection area, or the effective section of the concrete is reduced, or the protective layer of the steel member is not enough, or the strength of the concrete interface is insufficient, or the connection with the load-bearing member is not firm, etc., resulting in the overall floor after assembly. The weakening of compressive, tensile, shear, and flexural bearing capacity and rigidity in the plane seriously affects its function of coordinating the vertical structural system; reflected in construction: or the splicing of concave-convex prefabricated panels is difficult, or the processing technology of special steel components is complex , or a large number of on-site welding of steel components, or large-scale grouting, or difficult calibration of connecting steel bars or bolt holes, or overhead welding, upward screwing of bolts, etc., resulting in low construction efficiency or even lack of practical operability, and construction quality is difficult to guarantee; reflect In terms of construction cost: either the amount of steel used is too large, or the quality of the grouting material is high, or there are too many finished steel components, or the prefabricated floor formwork is complicated, or the construction period is long, etc., resulting in a substantial increase in construction and installation costs, the market accepts To a lesser extent.

Utility model content

In order to solve the problems existing in the background technology and to achieve the structural mechanical properties of the fully cast-in-place reinforced concrete floor slab, the utility model provides a fully assembled reinforced concrete floor slab with excellent structural stress performance, convenient construction and good economy. Solve the problems encountered in the design, construction and cost of the current prefabricated reinforced concrete floor slab, and promote the realization of the quality, environmental protection, efficiency, cost and other control goals of the prefabricated concrete structure.

Guided by the theory of structural engineering, especially the theory of composite structures, the utility model attempts to solve the above-mentioned technical problems according to the current technical standards, so as to realize the fully prefabricated and fully assembled reinforced concrete floor slabs to the greatest extent.

Main scheme of the present utility model comprises as follows:

1. A fully assembled reinforced concrete floor slab connected by a steel-concrete composite structure:

including the prefabricated units themselves;

The main body inside the prefabricated unit is a reinforced concrete prefabricated floor, which is mainly composed of double-layer two-way steel mesh and concrete poured on it; the double-layer two-way steel mesh includes multiple main direction reinforcement groups and multiple secondary direction reinforcement Each main direction reinforcement group is arranged parallel to the main direction of the prefabricated unit, and each secondary direction reinforcement group is arranged parallel to the prefabricated unit's minor direction, the main direction reinforcement group and the secondary direction reinforcement group are vertically arranged, the main direction reinforcement group and the The steel bars in the secondary direction are connected by tie bars; the main channel steel assembly and the secondary channel steel assembly are arranged around the prefabricated unit, and a part of the main channel steel assembly and the secondary channel steel assembly are buried in concrete and connected with the double-layer two-way steel bars The main direction steel bar group of the net is connected with the secondary direction steel bar group, and the other part protrudes from the concrete for connection with the load-bearing beam.

The main direction of the prefabricated unit is defined as the direction in which the prefabricated unit is connected to the load-bearing beam.

The main direction reinforcement group is mainly composed of the main direction slab surface reinforcement and the main direction slab bottom reinforcement respectively arranged in parallel up and down, and the secondary direction reinforcement group is mainly composed of the secondary direction slab surface reinforcement and the secondary direction slab bottom reinforcement respectively arranged in parallel up and down The slab bottom reinforcement in the main direction and the slab bottom reinforcement in the secondary direction are located on the same plane, and the slab bottom reinforcement in the main direction and the slab bottom reinforcement in the secondary direction are located on the same plane; the slab bottom reinforcement in the secondary direction and the concrete below both extend outward to form a cantilever Pick the slab, and make a concrete oblique cut at the top corner of the outer end of the cantilever slab; set tie bars in the double-layer two-way steel mesh, and the two ends of the tie bars are connected between a main direction steel bar group and a primary direction steel bar group .

The double-layer two-way steel mesh is provided with a main channel steel assembly at the intersection between the main direction steel bar group and the secondary direction steel bar group at both ends of the main direction along the prefabricated unit; A secondary channel steel assembly is arranged at the intersection between the main direction reinforcement group and the secondary direction reinforcement group at the two ends of the unit's secondary direction.

Described main channel steel assembly comprises main channel steel upper flange plate, main channel steel lower flange plate, main channel steel web plate and main channel steel stiffening plate; by main channel steel upper flange plate, main channel steel lower wing The flange plate and the main channel steel web form the main channel steel body, and the main channel steel stiffener plate is fixedly welded between the upper flange plate of the main channel steel and the middle part of the lower flange plate of the main channel steel, and the main channel steel stiffener plate is welded together Arranged vertically to the main channel steel web; with the main channel steel stiffener as the boundary, the main channel steel assembly is divided into an inner extension section and an outer extension section, and the main channel steel web of the outer extension section is provided with a main channel steel web Bolt holes, the main channel steel web bolt holes are waist-shaped through holes along the vertical direction in the length direction; The edge plate is welded to the main direction slab surface reinforcement and the main direction slab bottom reinforcement respectively.

Described secondary channel steel assembly comprises secondary channel steel upper flange plate, secondary channel steel lower flange plate, secondary channel steel web plate and secondary channel steel stiffening plate; by secondary channel steel upper flange plate, secondary channel steel lower wing The flange plate and the secondary channel steel web constitute the main channel steel body, and the secondary channel steel stiffener plate is fixedly welded between the upper flange plate of the secondary channel steel and the middle part of the lower flange plate of the secondary channel steel, and the secondary channel steel stiffener plate is welded together Arranged vertically to the secondary channel steel web; with the secondary channel steel stiffener as the boundary, the secondary channel steel assembly is divided into an inward section and an outreach section, and the secondary channel steel web of the outreach section is provided with a secondary channel steel web Bolt holes, the bolt holes in the web of the secondary channel steel are waist-shaped through holes along the vertical direction in the length direction; The edge plate is welded with the steel bars on the surface of the plate in the secondary direction and the steel bars at the bottom of the plate in the secondary direction respectively.

The end of the prefabricated unit in the main direction rests on the load-bearing beam, and the ends of a prefabricated unit along the main direction are respectively placed on both sides of the load-bearing beam; The ends of two adjacent prefabricated units in the main direction are connected through the main connecting plate, and the concrete is poured and additional reinforcement is provided on the main direction slab surface; the ends of the two adjacent prefabricated units along the secondary direction in the The secondary connecting slab is connected, and concrete is poured and additional reinforcement is set on the slab surface in the secondary direction.

The ends in the main direction of two adjacent prefabricated units located on both sides of the load-bearing beam and along the same main direction are connected in the following way:

In the main direction of the prefabricated unit, the main channel steel components of the two prefabricated units are connected by a main connecting plate, and each main channel steel component and the main connecting plate are connected by high-strength bolts; the main connecting plate is a long steel plate , the main connecting plate is provided with horizontal waist-shaped holes at both ends as the bolt holes of the main connecting plate, and the horizontal waist-shaped hole is set in the middle as the long slot hole of the main connecting plate, and the upper and lower edges of the main connecting plate are provided with grooves for the main connecting plate; the main connecting plate at both ends The bolt holes are respectively connected by high-strength bolts and the main channel steel components of the two prefabricated units. The high-strength bolts pass through the main channel steel web bolt holes of the main channel steel components in turn, the main connecting plate bolt holes of the main connecting plate, and tighten the nuts. , so that the main channel steel component of the prefabricated unit is fixedly connected with the main connecting plate.

In the secondary direction of the prefabricated unit, the secondary channel steel components of the two prefabricated units are connected by a secondary connecting plate, and each secondary channel steel component and the secondary connecting plate are connected by high-strength bolts; the secondary connecting plate is a long steel plate , both ends of the secondary connecting plate are provided with horizontal waist-shaped holes as the bolt holes of the secondary connecting plate, horizontal waist-shaped holes are set in the middle as long slot holes of the secondary connecting plate, grooves are set on the upper and lower edges of the secondary connecting plate; the secondary connecting plate at both ends The bolt holes are respectively connected by high-strength bolts and the secondary channel steel components of the two prefabricated units. The high-strength bolts pass through the bolt holes of the main channel steel web of the secondary channel steel component, the bolt holes of the secondary connecting plate of the secondary connecting plate, and tighten the nuts. , so that the secondary channel steel component of the prefabricated unit is fixedly connected with the secondary connecting plate.

In the main direction of the prefabricated unit, the overhanging sections of the main channel steel components of two adjacent prefabricated units rest on the load-bearing beam to form a structure with the beam surface of the load-bearing beam as the bottom formwork and the sides of two adjacent prefabricated units as the side formwork. Groove, concrete is poured in the groove, and additional steel bars on the main direction slab are buried, and the additional steel bars on the main direction slab are perpendicular to the main connecting plate and bound to form the connection area of the steel-concrete composite structure; In the direction, the ends of the cantilever slabs of two adjacent prefabricated units are closely connected together to form a groove. Concrete is poured in the groove, and additional reinforcement bars are buried on the slab surface of the secondary direction. Orthogonal and strapped to form the connection zone of the steel-concrete composite structure.

The load-bearing beam is a reinforced concrete prefabricated beam or an H-shaped steel beam;

When the load-bearing beam is a reinforced concrete prefabricated beam, a shear stirrup is arranged between every two adjacent main connecting plates, so that the shear stirrups and the main connecting plates are alternately arranged, and each shear stirrup is fixed and pre-buried In the beam top of the reinforced concrete prefabricated beam;

When the load-bearing beam is an H-shaped steel beam, a shear stud is arranged between every two adjacent main connecting plates, so that the shear studs are arranged alternately with the main connecting plates, and each shear stud is fixedly welded to On the top of the upper flange of the H-beam.

2. The construction method of the fully assembled reinforced concrete floor, including:

The prefabricated units are prefabricated in the factory first, and the prefabricated units are hoisted above the load-bearing beams on the site as steel supports, and the prefabricated units are arranged between every two load-bearing beams. Multiple prefabricated units are closely spaced along the direction of the load-bearing beams. The two ends of a prefabricated unit along the main direction rest on two load-bearing beams, and the two ends of each prefabricated unit along the secondary direction are suspended and connected; between two prefabricated units adjacent to each other along the main direction on the same load-bearing beam, according to the prefabricated unit and The connection structure between the load-bearing beams is connected to the main connecting plate, and then additional steel bars are installed to bind the upper main direction plate surface. The beam surface of the load-bearing beam is used as the bottom formwork, and the sides of two adjacent prefabricated units are the grooves of the side formwork. The concrete is poured in-situ, and the continuity of the concrete between the prefabricated units is realized; the main connecting plate is connected between two prefabricated units adjacent to the secondary direction along the load-bearing beam direction according to the connection structure between the prefabricated unit and the load-bearing beam, and then set Bind the additional reinforcement on the slab surface of the previous direction, and finally use the top surface of the beam and the cantilever slab as the bottom formwork to cast in-situ concrete, and realize the continuity of the concrete between the prefabricated units.

The channel steel assembly of the utility model takes the finished channel steel as the main part, welds the stiffening plate and the web plate to open holes, and serves as the conversion member for the connection of steel bars between the prefabricated units, the support of the prefabricated unit, the corbel of the cantilever plate and the new Shear pieces of old concrete connections. The long slot holes opened in the connecting plate form the upper and lower plate strips to act as through steel bars, serve as grout holes when pouring concrete, act as shear parts to increase the bite force with concrete when in use, and weaken the bending stiffness when installing high-strength bolts to improve the complete friction surface .

In addition to connecting the prefabricated unit concrete, the post-cast strip concrete is used as a compressive material to restrain the connecting plate and high-strength bolts, as a fireproof and anti-corrosion material to protect steel components and steel bars, and as a grouting material to fill the joints in the secondary direction of the unit.

When the calculated height of the beam section is included in the slab thickness of the floor, that is, when the composite effect of the precast concrete beam or the combined effect of the steel beam is considered, the shear stirrups at the top of the precast concrete beam also have the function of the composite beam stirrup, and the slab frame The vertical reinforcement also serves as the upper stress reinforcement of the composite beam; the shear studs welded above the flange of the steel beam and the vertical reinforcement of the slab participate in the bending resistance and crack control of the continuous beam at the support.

Compared with the prior art, the utility model has the following characteristics and beneficial effects:

The construction operation of the fully assembled reinforced concrete floor slab of the utility model is convenient, efficient, material-saving and energy-saving.

The fabrication and connection arrangements of the prefabricated units of the utility model are highly efficient and compact, and through reasonable combination and collocation, the mechanical properties of steel, steel bars and concrete materials can be fully utilized to obtain more superior structural performance, and achieve "one piece with multiple functions" and "all things to the fullest". Its use", comprehensive cost-effective.

Under the structure of the utility model, a large number of manual welding operations on site can be avoided, the problem of bolt hole calibration can be solved, and the installation efficiency can be greatly improved.

The prefabricated unit of the utility model is hoisted in place without adding temporary supports, without additional templates, and without joint grouting or groove grouting; the entire construction operation is completed on the floor, reducing labor intensity and improving work efficiency.

Description of drawings

Figure 1 is a three-dimensional schematic diagram of a fully assembled reinforced concrete floor prefabricated unit.

Fig. 2 Structural cross-sectional view of the main direction of the prefabricated unit.

Fig. 3 The sub-direction structural cross-sectional view of the prefabricated unit.

Figure 4 Elevation view of channel steel components.

Figure 5. Sectional view of connection of prefabricated units in the main direction (prefabricated beam support).

Figure 6. Sectional view of connection of prefabricated units in the main direction (steel beam support).

Fig. 7 The cross-sectional view of the prefabricated unit connection in the secondary direction.

Figure 8 Elevation view of the connecting plate.

Figure 9. Three-dimensional schematic diagram of high-strength bolt connection.

Reference signs:

1 Reinforced concrete prefabricated floor, 1.1 Concrete, 1.2 Main direction slab surface reinforcement, 1.3 Main direction slab bottom reinforcement, 1.4 Secondary direction slab surface reinforcement, 1.5 Secondary direction slab bottom reinforcement, 1.6 Tie reinforcement, 1.7 Cantilever slab, 1.8 Concrete cut ;

2 main channel components, 2.1 main channel upper flange plate, 2.2 main channel lower flange plate, 2.3 main channel web, 2.4 main channel stiffener, 2.5 main channel web bolt holes;

3 channel steel components, 3.1 channel steel upper flange plate, 3.2 channel steel lower flange plate, 3.3 channel steel web, 3.4 channel steel stiffener, 3.5 channel steel web bolt holes;

4 Reinforced concrete prefabricated beams, 4.1 Shear stirrups;

5H steel beam, 5.1 steel beam upper flange, 5.2 shear studs;

6 Main connecting plate, 6.1 Main connecting plate bolt hole, 6.2 Main connecting plate long slot hole, 6.3 Main connecting plate groove;

7 connecting plates, 7.1 connecting plate bolt holes, 7.2 connecting plate long slot holes, 7.3 connecting plate grooves;

8 High-strength bolts, 8.1 Washers, 8.2 Nuts, 8.3 Backing plates, 8.3.1 Backing plate bolt holes;

9 additional reinforcement on the slab surface in the main direction, 10 additional reinforcement on the slab surface in the secondary direction, and 11 cast-in-place concrete.

Detailed ways

Below in conjunction with accompanying drawing and concrete implementation the utility model is further described.

As shown in Figure 1, the structure of the utility model mainly includes the prefabricated unit itself of the fully assembled reinforced concrete floor slab, the connection between the prefabricated units, and the connection between the prefabricated unit and the load-bearing beam.

The prefab unit itself:

The fully assembled reinforced concrete floor prefabricated unit is shown in Figure 1. The internal body of the prefabricated unit is a reinforced concrete prefabricated floor 1. Pouring concrete in the steel mesh 1.1;

The double-layer two-way steel mesh includes multiple main direction steel bar groups and multiple secondary direction steel bar groups, each main direction steel bar group is arranged in parallel along the main direction of the prefabricated unit, and each secondary direction steel bar group is arranged in parallel along the secondary direction of the prefabricated unit, The main direction and the secondary direction of the prefabricated unit are perpendicular to each other, the main direction steel bar group and the secondary direction steel bar group are arranged vertically, and the main direction steel bar group and the secondary direction steel bar group are connected by tie bars 1.6; The main channel steel assembly 2 and the secondary channel steel assembly 3, a part of the main channel steel assembly 2 and the secondary channel steel assembly 3 are buried in the concrete 1.1 and connected with the main direction steel bar group and the secondary direction steel bar group of the double-layer two-way steel mesh, The other protrudes from the concrete 1.1 for connection with the load-bearing beam.

The main direction reinforcement group is mainly composed of the main direction slab surface reinforcement 1.2 and the main direction slab bottom reinforcement 1.3 respectively arranged in parallel up and down, and the secondary direction reinforcement group is mainly composed of the secondary direction slab surface reinforcement 1.4 and the secondary direction slab bottom reinforcement 1.5 respectively arranged in parallel up and down. All main direction slab surface reinforcement 1.2 and all secondary direction slab surface reinforcement 1.4 are located on the same plane, all main direction slab bottom reinforcement 1.3 and all secondary direction slab bottom reinforcement 1.5 are located on the same plane; among them, the secondary direction slab bottom reinforcement 1.5 and the one below The concrete 1.1 is extended outward to form a cantilever slab 1.7, and a concrete oblique cut 1.8 is made at the top corner of the outer end of the cantilever slab 1.7, as shown in Figure 3; 1.6 Both ends are connected between a main direction reinforcement group and a primary direction reinforcement group.

In this way, the slab surface reinforcement 1.2 in the main direction, the slab bottom reinforcement 1.3 in the main direction, the slab surface reinforcement 1.4 in the secondary direction, and the slab bottom reinforcement 1.5 in the secondary direction form a double-layer bidirectional reinforcement mesh through the tie reinforcement 1.6.

One end of the tie bar 1.6 is welded and connected at the intersection between the main direction slab reinforcement 1.2 of the main direction reinforcement group and the secondary direction slab reinforcement 1.4 of the secondary direction reinforcement group, and the other end of the tie reinforcement 1.6 is welded and connected to the main direction reinforcement group The cross point between the main direction slab bottom reinforcement 1.3 and the secondary direction slab bottom reinforcement 1.5 of the secondary direction reinforcement group.

A main channel steel component 2 is arranged at the cross point between the main direction slab reinforcement 1.2 of the main direction reinforcement group and the secondary direction slab reinforcement 1.4 of the secondary direction reinforcement group along the two ends of the main direction of the prefabricated unit. , that is, at both ends of the secondary direction of the prefabricated unit, and at the intersection between the main direction slab reinforcement 1.2 of the main direction reinforcement group and the secondary direction slab reinforcement 1.4 of the secondary direction reinforcement group, and the main direction slab bottom reinforcement of the main direction reinforcement group A main channel steel component 2 is connected between 1.3 and the intersection of the secondary direction slab bottom reinforcement 1.5 of the secondary direction reinforcement group;

A secondary channel steel component 3 is arranged at the cross point between the main direction slab surface reinforcement 1.2 of the main direction reinforcement group and the secondary direction slab surface reinforcement 1.4 of the secondary direction reinforcement group along the two ends of the prefabricated unit secondary direction. , that is, at both ends of the secondary direction of the prefabricated unit, and at the intersection between the main direction slab reinforcement 1.2 of the main direction reinforcement group and the secondary direction slab reinforcement 1.4 of the secondary direction reinforcement group, and the main direction slab bottom reinforcement of the main direction reinforcement group A secondary channel steel component 3 is connected to the intersection between 1.3 and the secondary direction slab bottom reinforcement 1.5 of the secondary direction reinforcement group.

The main channel steel component 2 includes the main channel steel upper flange plate 2.1, the main channel steel lower flange plate 2.2, the main channel steel web plate 2.3 and the main channel steel stiffening plate 2.4;

Main channel steel stiffener 2.4 is welded with main channel steel upper flange plate 2.1, main channel steel lower flange plate 2.2, main channel steel web 2.3, and main channel steel upper flange plate 2.1, main channel steel lower flange The plate 2.2 and the main channel web 2.3 constitute the main channel body, the main channel stiffener 2.4 is fixedly welded between the upper flange plate 2.1 of the main channel and the middle part of the lower flange plate 2.2 of the main channel, and the main channel Stiffener 2.4 is welded and arranged perpendicular to main channel web 2.3, main channel stiffener 2.4, main channel upper flange 2.1/main channel lower flange 2.2, main channel web 2.3 vertical arrangement;

With the main channel steel stiffener 2.4 as the boundary, the main channel steel assembly 2 is divided into an inner extension section and an outer extension section, wherein the main channel steel web 2.3 of the outer extension section is provided with a main channel steel for connecting adjacent prefabricated units The web bolt hole 2.5, the main channel steel web bolt hole 2.5 is a waist-shaped through hole along the vertical direction in the length direction, see Figure 2 and Figure 4;

As shown in Figure 2, there are 2 places in each main channel steel assembly. The inner extension section is poured and buried in the concrete 1.1. Surface reinforcement 1.2 and main direction slab bottom reinforcement 1.3 are welded.

The secondary channel steel component 3 includes the secondary channel steel upper flange plate 3.1, the secondary channel steel lower flange plate 3.2, the secondary channel steel web plate 3.3 and the secondary channel steel stiffening plate 3.4;

The secondary channel steel stiffener 3.4 is welded to the secondary channel steel upper flange plate 3.1, the secondary channel steel lower flange plate 3.2, and the secondary channel steel web plate 3.3, and the secondary channel steel upper The plate 3.2 and the secondary channel steel web 3.3 constitute the main channel steel body, and the secondary channel steel stiffening plate 3.4 is fixedly welded between the middle part of the secondary channel steel upper flange plate 3.1 and the secondary channel steel lower flange plate 3.2, and the secondary channel steel Stiffener 3.4 is welded and arranged perpendicular to secondary channel web 3.3, secondary channel stiffener 3.4, secondary channel upper flange 3.1/secondary channel lower flange 3.2, secondary channel web 3.3 vertical arrangement;

With the secondary channel steel stiffening plate 3.4 as the boundary, the secondary channel steel assembly 3 is divided into an inner extension section and an outer extension section, wherein the secondary channel steel web 3.3 of the outer extension section is provided with a secondary channel steel for connecting adjacent prefabricated units The web bolt hole 3.5, the secondary channel steel web bolt hole 3.5 is a waist-shaped through hole along the vertical direction in the length direction, see Figure 3 and Figure 4;

As shown in Figure 3, there are 2 places in each main channel steel assembly, the inner extension section is poured and buried in the concrete 1.1, the upper flange plate 3.1 of the secondary channel steel of the inner extension section, the lower flange plate 3.2 of the secondary channel steel and the secondary direction plate respectively Weld 1.4 surface steel bars and 1.5 steel bottom steel bars in the secondary direction.

The load-bearing beam is a reinforced concrete prefabricated beam 4 or an H-shaped steel beam 5, and the H-shaped steel beam 5 can also be a steel beam of other cross-section forms such as channel steel and box-shaped steel, and the H-shaped steel beam 5 is only an example.

The end of the prefabricated unit in the main direction is placed on the load-bearing beam, and the two sides of the load-bearing beam are respectively placed with the end of a prefabricated unit along the main direction; The ends of the prefabricated units in the main direction are connected by the main connecting plate 6, and the concrete 11 is poured and the additional steel bars 9 on the main direction slab surface are set; the ends of the two adjacent prefabricated units along the secondary direction are passed through The secondary connecting plate 7 is connected, and the concrete 11 is poured and the additional steel bar 10 is set on the secondary direction plate surface.

Connections between prefabricated units:

See Figure 5 and Figure 6, in the main direction of the prefabricated unit, the main channel steel components 2 of the two prefabricated units are connected by a main connecting plate 6, and each main channel steel component 2 and the main connecting plate 6 are connected by a high-strength Bolt 8 connection;

As shown in Figure 8, the main connecting plate 6 is a long steel plate, and the main connecting plate 6 is provided with horizontal waist-shaped holes at both ends of the horizontal as the bolt hole 6.1 of the main connecting plate, and a horizontal waist-shaped hole is set in the middle as the long groove of the main connecting plate Holes 6.2, the upper and lower edges of the main connecting plate are provided with grooves 6.3; the bolt holes 6.1 of the main connecting plate at both ends are respectively connected by high-strength bolts 8 and the main channel steel components 2 of the two prefabricated units. Pass through the main channel steel web bolt hole 2.5 of the main channel steel component 2 of a prefabricated unit in turn outward, and the main connecting plate bolt hole 6.1 at one end of the main connecting plate 6, and tighten the connection with the nut 8.2, so that the main channel steel of the prefabricated unit One end of the assembly 2 is fixedly connected to the main connecting plate 6 .

Similarly, as shown in Figure 7, in the secondary direction of the prefabricated unit, the secondary channel steel components 3 of the two prefabricated units are connected by a secondary connecting plate 7, and each secondary channel steel component 3 and the secondary connecting plate 7 are connected by a high-strength Bolt 8 connection;

As shown in Figure 8, the secondary connecting plate 7 is a long steel plate, and the horizontal ends of the secondary connecting plate 7 are provided with horizontal waist-shaped holes as the bolt holes 7.1 of the secondary connecting plate, and a horizontal waist-shaped hole is set in the middle as the long groove of the secondary connecting plate Hole 7.2, the upper and lower side edges are provided with secondary connecting plate groove 7.3; the secondary connecting plate bolt holes 7.1 at both ends are respectively connected by high-strength bolts 8 and the secondary channel steel components 3 of the two prefabricated units, and the high-strength bolts 8 are connected from the inner side of the secondary channel steel component 3 Pass through the main channel web bolt hole 2.5 of the secondary channel steel assembly 3 of a prefabricated unit outward, and the secondary connecting plate bolt hole 7.1 at one end of the secondary connecting plate 7, and then tighten and connect with the nut 8.2, so that the secondary channel steel of the prefabricated unit One end of the assembly 3 is fixedly connected to the secondary connecting plate 7 .

Among them, the long slot hole 6.2 of the main connecting plate is provided in the main connecting plate 6, which plays a role in bearing through the steel bar, acting as a through reinforcing bar, and acting as a grouting hole when used differently, acting as a shear member to increase the occlusal force with the concrete, and weaken the bending force. Flexural stiffness to enhance the action of a versatile piece of the complete friction surface. The same is true for the secondary connecting plate slotted hole 7.2 on the secondary connecting plate 7 .

Among them, the groove 6.3 of the main connecting plate is provided on the upper and lower side edges of the main connecting plate 6, which plays a role in weakening the out-of-plane rigidity, enabling moderate bending outside the plane, reducing construction errors, and ensuring the integrity of the contact surface of the steel plate. role. The same is true for the opening of the secondary connecting plate groove 7.3 on the upper and lower side edges of the secondary connecting plate 7 .

In addition to the supporting nut 8.2, the high-strength bolt 8 is specially equipped with a standard washer 8.1 and a backing plate 8.3. The backing plate 8.3 is provided with a bolt hole 8.3.1 for the backing plate that the high-strength bolt 8 has passed through. The hole diameter is 1.5~ larger than the nominal diameter of the bolt. 2mm.

In the main direction of the prefabricated unit, the high-strength bolts 8 pass through the backing plate bolt hole 8.3.1, the main channel steel web bolt hole 2.5, the main connecting plate bolt hole 6.1, and the backing plate bolt hole 8.3.1 from the inner side of the main channel steel. Tighten the nut 8.2 on the outside of the channel steel to complete the mechanical connection between the main channel steel assembly 2 and the main connecting plate 6. The same is true for the secondary direction of the prefabricated unit, as shown in Figure 9.

Connection between prefabricated units and load-bearing beams:

In the main direction of the prefabricated unit, the overhanging sections of the main channel steel components 2 of the two adjacent prefabricated units are rested on the load-bearing beam, forming the beam surface of the load-bearing beam as the bottom formwork and the sides of the two adjacent prefabricated units as the side formwork In the groove, concrete 11 is poured in the groove, and the additional reinforcement 9 on the main direction slab is buried, the additional reinforcement 9 on the main direction slab is orthogonal to the main connecting plate 6 and bound, and the additional reinforcement 9 on the main direction slab is parallel to the load-bearing beam , thus forming the connection area of the steel-concrete composite structure, see Fig. 5 and Fig. 6;

When the load-bearing beam is a reinforced concrete prefabricated beam 4, a shear stirrup 4.1 is arranged between every two adjacent main connecting plates 6, so that the shearing stirrup 4.1 and the main connecting plate 6 are alternately arranged at intervals, and each shearing The stirrup 4.1 is fixed and pre-buried in the beam top of the reinforced concrete prefabricated beam 4;

When the load-bearing beam is an H-shaped steel beam 5, a shear stud 5.2 is arranged between every two adjacent main connecting plates 6, so that the shear studs 5.2 are arranged alternately with the main connecting plates 6, and each shear The stud 5.2 is fixedly welded to the top surface of the upper flange of the H-shaped steel beam 5 .

In the secondary direction of the prefabricated unit, the ends of the cantilevered slabs 1.7 of two adjacent prefabricated units are close together to form a groove, and concrete 11 is poured in the groove, and additional steel bars 10 are buried on the surface of the secondary direction. The additional steel bar 10 on the surface is bound vertically and orthogonally to the secondary connecting plate 7 to form the connecting area of the steel-concrete composite structure, as shown in FIG. 7 .

The prefabricated units are prefabricated in the factory first, and the prefabricated units are hoisted above the load-bearing beams on the site as steel supports, and the prefabricated units are arranged between every two load-bearing beams. Multiple prefabricated units are closely spaced along the direction of the load-bearing beams. The two ends of a prefabricated unit along the main direction rest on two load-bearing beams, and the two ends of each prefabricated unit along the secondary direction are suspended and connected;

Two adjacent prefabricated units along the main direction on the same load-bearing beam are connected to the main connecting plate 6 according to the connection structure between the prefabricated unit and the load-bearing beam, and then the additional steel bars 9 welded on the main direction plate surface are installed, and the beam surface of the load-bearing beam is The bottom formwork and the side of two adjacent prefabricated units are the grooves of the side formwork, and the concrete 11 is poured in the groove, and the continuity of the concrete between the prefabricated units is realized;

Connect the main connecting plate 6 between two prefabricated units adjacent to the secondary direction along the load-bearing beam direction according to the connection structure between the prefabricated unit and the load-bearing beam, and then install and weld the additional steel bar 10 on the plate surface in the previous direction, and finally use the beam top The surface and the cantilever slab are cast-in-place concrete 11 as the bottom formwork, and realize the continuity of concrete between prefabricated units.

The overall structure of the utility model realizes the penetration of steel bars between prefabricated units: through "upper and lower steel bars → upper and lower flanges of channel steel → square friction surface → upper and lower steel strips → square friction surface → upper and lower flanges of channel steel → upper and lower steel bars" A force transmission path combining line and surface, so that the steel bars between the prefabricated units can run through the entire length like the steel mesh of the fully cast-in-place reinforced concrete floor, without the need for indirect force transmission such as concrete anchorage force and shear force, avoiding prefabricated units Additional stress concentrations in the connection area.

As shown in Figure 1, the number and arrangement spacing of the main channel steel assembly 2 and the secondary channel steel assembly 3 correspond to the reinforcement bars 1.2 and 1.3 in the main direction and the reinforcement bars 1.4 and 1.5 in the secondary direction respectively. The length of the double-sided welding seam (5 times the diameter of the steel bar) is sufficient. The connection arrangement between the channel steel components and the plate reinforcement is efficient and compact. On the one hand, the plate reinforcement serves as the anchoring reinforcement of the channel steel components, effectively anchoring the channel steel components to the prefabricated unit; , to realize the continuous force transmission of steel bars between prefabricated units.

As shown in Figure 2 and Figure 4, the inner side of the main channel steel stiffener 2.4 is flush with the outer edge of the prefabricated unit, serving as a side formwork for pouring concrete in the main channel steel, simplifying the formwork system; the main channel steel stiffener 2.4 and the main channel The steel web 2.3, main channel steel upper flange plate 2.1, and main channel steel lower flange plate 2.2 are welded, so that the extended section of the main channel steel assembly 2 becomes a steel support and rests on the load-bearing beam, and the installation is convenient and reliable. There is no need for temporary support; the main channel steel web bolt hole 2.5 provided on the extended section of the main channel steel web 2.3 is a vertical long slotted hole, so that the main connecting plate 6 can move up and down moderately during installation to cope with the two ends of the connecting plate 6 Construction errors and deformations when the connected prefabricated units are placed in the height direction (Z direction).

As shown in Figure 3 and Figure 4, the outer side of the secondary channel steel stiffener 3.4 is flush with the outer edge of the prefabricated unit, which can serve as a side formwork for pouring concrete in the secondary channel steel, simplifying the formwork system; the secondary channel steel stiffener 3.4 and the secondary channel steel After the channel steel web 3.3, the secondary channel steel upper flange plate 3.1, and the secondary channel steel lower flange plate 3.2 are welded, the extended section of the secondary channel steel assembly 3 constitutes a steel corbel to support the lower cantilever plate 1.7, improving the cantilever The bearing capacity of the pick plate 1.7 reduces the damage during transportation and construction; the bolt hole 3.5 of the secondary channel steel web plate provided by the overhanging section of the secondary channel steel web plate 3.3 is a vertical long slot hole, so that the secondary connecting plate 7 can be installed It can move up and down moderately to cope with the construction error and deformation of the prefabricated units connected at both ends of the connecting plate 7 in the height direction (Z direction).

As shown in Figure 8, the main connecting plate 6 is provided with the long slot hole 6.2 of the main connecting plate to form the upper and lower strips, and the effective area of the cross-section of the upper and lower strips is respectively the effective area of the connected main direction plate surface reinforcement 1.2 and the main direction plate bottom reinforcement 1.3 Correspondingly, it bears the function of penetrating steel bars; the two ends of the main connecting plate 6 are provided with the main connecting plate bolt holes 6.1 as horizontal long slotted holes, so that the main connecting plate 6 can move left and right moderately during installation, so as to deal with the main connecting plate 6. The construction error when the connected prefabricated units are arranged in the main direction (X direction); three main connecting plate grooves 6.3 are respectively set on the outer sides of the upper and lower strips of the main connecting plate 6, and by weakening the out-of-plane of the strip area of the main connecting plate 6 Rigidity, so that the main connecting plate 6 can be moderately bent outside the plane, so as to deal with the construction error when the prefabricated units connected to the main connecting plate 6 are arranged in the secondary direction (Y direction), and ensure the integrity of the contact surface of the steel plate. The construction and function of the secondary connecting plate 7 are similar to the main connecting plate 6 .

As shown in Figure 4, Figure 8, and Figure 9, under ideal conditions, the main channel steel web bolt hole 2.5 overlaps with the connecting plate bolt hole 6.1 to form a "ten" shape. In extreme cases, the main channel steel web bolt hole The holes 2.5 and the connecting plate bolt holes 6.1 are superimposed to form one of the four "L" shapes each turned 90 degrees, and the high-strength bolts 8 can pass through the overlapping area of the two holes smoothly; since the connecting piece is a long slotted hole, the washer 8.1 The action area is not enough, especially the backing plate 8.3 is added, the backing plate 8.3 is provided with the backing plate bolt hole 8.3.1, according to the national standard, the hole diameter is 1.5-2mm larger than the nominal diameter of the bolt, and the nut 8.2 is tightened to apply pressure on the backing plate 8.3, through the backing plate The transition of the plate 8.3 effectively transmits the pressure to the contact surface between the main connecting plate 6 and the overhanging section of the main channel steel web 2.3 to generate friction and realize the shear connection of the steel components.

In short, in order to cope with the allowable errors of civil engineering in the three dimensions of prefabricated units installed in the up and down (Z direction), left and right (X direction), front and rear (Y direction), the high-strength bolt connectors are designed with long slotted holes, Structural measures such as grooves and additional backing plates improve installation efficiency and ensure the quality of high-strength bolt connections.

Realize the continuity of concrete between prefabricated units: learn from and improve the structure of the post-construction pouring belt, and closely combine the concrete of adjacent prefabricated units. The occlusal force of the interface between prefabricated unit concrete and cast-in-place concrete, supplemented by vertical bars and structural steel bars, makes the post-cast area a steel-concrete composite structure, and the connection strength is higher than that of the currently commonly used post-cast belt.

As shown in Figure 7, in the secondary direction of the prefabricated unit, after the adjacent prefabricated unit is hoisted in place, a groove is naturally formed, the cantilever plate 1.7 acts as the bottom formwork of the groove, and the end concrete oblique cut 1.8 forms a "V"-shaped small The notch is used to fill the joint with grout, and the overhanging section of the secondary channel steel component 3 protrudes from the edge of the prefabricated unit, so that the edge of the groove forms a zigzag profile; the interface between the cast-in-place concrete 11 in the groove and the prefabricated unit has a secondary The overhanging section of the channel steel assembly 3 acts as a shear member, the upper and lower strips of the secondary connecting plate 7 serve as through reinforcement bars, and additional steel bars 10 are attached to the secondary connecting plate 7 to constrain the secondary connecting plate 7. The entire post-casting strip forms a steel-reinforced concrete composite structure, and the connecting The performance has surpassed the general post-construction pouring belt, making the prefabricated units connected into a whole floor.

As shown in Figure 5 and Figure 6, the "continuity" of the prefabricated unit concrete in the main direction is similar to the "continuity" in the secondary direction. In addition, the prefabricated unit still needs to achieve an effective connection with the load-bearing beam. After the adjacent prefabricated units are hoisted in place, they are placed on the load-bearing beam, and a groove with the top of the beam as the bottom formwork is naturally formed. When the load-bearing beam is a precast concrete beam 4, the shear stirrup 1.4 is pre-embedded on the top of the load-bearing beam. When the load-bearing beam is a steel beam 5, the shear stud 5.2 is welded above the upper flange 5.1 to realize the effective connection between the post-cast belt of the floor slab and the beam, and the additional steel bar 9 on the main direction slab constrains the main connecting plate 6 and the shear stirrup 1.4, and the groove The cast-in-place concrete 11 is poured inside, and the three new and old concrete interfaces are closely occluded, so that an integral beam-slab system is formed between the prefabricated units and between the prefabricated units and the load-bearing beams.

The improved post-casting strip connection mode of the utility model has mature technology, high construction efficiency and reliable quality, and realizes continuous floor concrete in the true sense. The floor slabs connected in this way are "equivalent to cast-in-place", and their overall mechanical performance is higher than that of floors connected by joint grouting or groove grouting or embedded parts welding.

Construction process of the present utility model:

The prefabricated units are prefabricated in the factory first, and the prefabricated units are hoisted above the load-bearing beams on the site as steel supports, and the prefabricated units are arranged between every two load-bearing beams. Multiple prefabricated units are closely spaced along the direction of the load-bearing beams. The two ends of a prefabricated unit along the main direction rest on two load-bearing beams, and the two ends of each prefabricated unit along the secondary direction are suspended and connected;

Two adjacent prefabricated units along the main direction on the same load-bearing beam are connected to the main connecting plate 6 according to the connection structure between the prefabricated unit and the load-bearing beam, and then the additional steel bars 9 welded on the main direction plate surface are installed, and the beam surface of the load-bearing beam is The bottom formwork and the side of two adjacent prefabricated units are the grooves of the side formwork, and the concrete 11 is poured in the groove, and the continuity of the concrete between the prefabricated units is realized;

Connect the main connecting plate 6 between two prefabricated units adjacent to the secondary direction along the load-bearing beam direction according to the connection structure between the prefabricated unit and the load-bearing beam, and then install and weld the additional steel bar 10 on the plate surface in the previous direction, and finally use the beam top The surface and the cantilever slab are cast-in-place concrete 11 as the bottom formwork, and realize the continuity of concrete between prefabricated units.

Therefore, the welding operations of the utility model are all completed in the factory, such as the connection of steel bars and pre-embedded steel components, the addition of stiffeners to finished channel steel, etc.; the on-site assembly of prefabricated units adopts conventional mechanical connections, that is, high-strength bolts, to avoid a lot of manual work on site. Welding work; the connection of high-strength bolts considers civil construction errors, solves the problem of bolt hole calibration, and greatly improves installation efficiency.

The prefabricated unit is hoisted in place and the overhanging section of the pre-embedded steel component is used as the steel support without additional temporary support; the post-casting with groove uses the top surface of the beam and the cantilever plate as the bottom formwork without additional formwork; the groove is cast-in-place concrete Realize the continuity of concrete between prefabricated units, without joint grouting or groove grouting; the entire construction operation is completed on the floor, reducing labor intensity and improving work efficiency.

Claims (9)

1. A fully assembled reinforced concrete floor slab connected by a steel-concrete composite structure, characterized in that: including prefabricated units; The main body inside the prefabricated unit is a reinforced concrete prefabricated floor slab (1), and the reinforced concrete prefabricated floor slab (1) is mainly composed of a double-layer two-way steel mesh and concrete (1.1) poured on it; the double-layer two-way steel mesh includes a plurality of main Directional reinforcement groups and multiple secondary direction reinforcement groups, each main direction reinforcement group is arranged in parallel along the main direction of the prefabricated unit, each sub-direction reinforcement group is arranged in parallel along the prefabricated unit’s secondary direction, the main direction reinforcement group and the secondary direction reinforcement group Arranged vertically, the main direction steel bar group and the secondary direction steel bar group are connected by tie bars (1.6); the main channel steel assembly (2) and the secondary channel steel assembly (3) are arranged around the prefabricated unit, and the main channel steel assembly Parts of (2) and the secondary channel steel assembly (3) are embedded in the concrete (1.1) and connected with the main direction reinforcement group and the secondary direction reinforcement group of the double-layer two-way reinforcement mesh, and the other part protrudes from the concrete (1.1) For connection to load-bearing beams. 2. The fully assembled reinforced concrete floor slab connected by a steel-concrete composite structure according to claim 1, characterized in that: the main direction reinforcement group is mainly composed of main direction slab reinforcement (1.2) and main direction slab The bottom steel bars (1.3) are respectively arranged in parallel up and down. The secondary direction reinforcement group is mainly composed of the secondary direction slab surface reinforcement (1.4) and the secondary direction slab bottom reinforcement (1.5) respectively arranged in parallel up and down. The main direction slab surface reinforcement (1.2 ) and the secondary direction slab surface reinforcement (1.4) are located on the same plane, and the main direction slab bottom reinforcement (1.3) and the secondary direction slab bottom reinforcement (1.5) are located on the same plane; where the secondary direction slab bottom reinforcement (1.5) and the concrete below (1.1) are all extended outward to form a cantilevered slab (1.7), and a concrete oblique cut (1.8) is made at the top corner of the outer end of the cantilevered slab (1.7); tie bars (1.6 ), the two ends of tie bars (1.6) are connected between a main direction reinforcement group and a primary direction reinforcement group. 3. The fully assembled reinforced concrete floor slab connected by a steel-concrete composite structure according to claim 1, characterized in that: said double-layer two-way reinforcement mesh is located along the main direction reinforcement group and the two ends of the prefabricated unit main direction. A main channel steel component (2) is arranged at the intersection between the secondary direction reinforcement groups; the double-layer two-way steel mesh is at the intersection between the main direction reinforcement group and the secondary direction reinforcement group at both ends of the prefabricated unit secondary direction A secondary channel steel assembly (3) is arranged at each place. 4. A fully assembled reinforced concrete floor slab connected by a steel-concrete composite structure according to claim 3, characterized in that: said main channel steel assembly (2) includes a main channel steel upper flange plate (2.1) , the main channel steel lower flange plate (2.2), the main channel steel web plate (2.3) and the main channel steel stiffener plate (2.4); the main channel steel upper flange plate (2.1), the main channel steel lower flange plate ( 2.2) and the main channel steel web (2.3) constitute the main channel steel body, and the main channel steel stiffener (2.4) is fixedly welded to the main channel steel upper flange plate (2.1) and the main channel steel lower flange plate (2.2) Between the middle part, the main channel steel stiffener (2.4) is welded and arranged perpendicular to the main channel steel web (2.3); with the main channel steel stiffener (2.4) as the boundary, the main channel steel assembly (2) is divided into inner The extension section and the overhang section, wherein the main channel steel web bolt hole (2.5) is set on the main channel steel web (2.3) of the outreach section, and the main channel steel web bolt hole (2.5) is along the vertical direction along the length direction. The waist-shaped through hole; the inner extension section is poured and buried in the concrete (1.1), and the main channel steel upper flange plate (2.1) and main channel steel lower flange plate (2.2) of the inner extension section are respectively connected with the main direction plate surface The steel bar (1.2) and the main direction slab bottom steel bar (1.3) are welded. 5. A fully assembled reinforced concrete floor slab connected by a steel-concrete composite structure according to claim 3, characterized in that: said secondary channel steel assembly (3) includes a secondary channel steel upper flange plate (3.1) , the secondary channel steel lower flange plate (3.2), the secondary channel steel web plate (3.3) and the secondary channel steel stiffener plate (3.4); the secondary channel steel upper flange plate (3.1), the secondary channel steel lower flange plate ( 3.2) and the secondary channel steel web (3.3) constitute the main channel steel body, and the secondary channel steel stiffener plate (3.4) is fixedly welded to the secondary channel steel upper flange plate (3.1) and the secondary channel steel lower flange plate (3.2) Between the middle part, the secondary channel steel stiffener (3.4) is welded and arranged perpendicular to the secondary channel steel web (3.3); with the secondary channel steel stiffener (3.4) as the boundary, the secondary channel steel assembly (3) is divided into inner The extension section and the overhang section, wherein the secondary channel steel web bolt hole (3.5) is set on the secondary channel steel web (3.3) of the outreach section, and the secondary channel steel web bolt hole (3.5) is along the vertical direction along the length direction The waist-shaped through hole; the inner extension section is poured and buried in the concrete (1.1), the upper flange plate (3.1) of the inner extension section, the lower flange plate (3.2) of the second channel steel and the second direction plate surface respectively The steel bar (1.4) and the steel bar (1.5) at the bottom of the slab in the secondary direction are welded. 6. The fully assembled reinforced concrete floor slab connected by a steel-concrete composite structure according to claim 1, characterized in that: The end of the prefabricated unit in the main direction rests on the load-bearing beam, and the ends of a prefabricated unit along the main direction are respectively placed on both sides of the load-bearing beam; The ends of two adjacent prefabricated units are connected by the main connecting plate (6), and the concrete (11) is poured and additional steel bars (9) are set on the slab surface in the main direction; the ends of the two adjacent prefabricated units along the secondary direction They are connected through the secondary connecting plate (7), and concrete (11) is poured and additional reinforcing bars (10) are set on the secondary direction plate surface. 7. A fully assembled reinforced concrete floor slab connected by a steel-concrete composite structure according to claim 1, characterized in that: the ends of two adjacent prefabricated units located on both sides of the load-bearing beam and along the same main direction are connected as follows: In the main direction of the prefabricated unit, the main channel steel components (2) of the two prefabricated units are connected by a main connecting plate (6), and each main channel steel component (2) and the main connecting plate (6) pass through High-strength bolts (8) are connected; the main connecting plate (6) is a strip-shaped steel plate, and the main connecting plate (6) is provided with horizontal waist-shaped holes at both ends as the bolt holes (6.1) of the main connecting plate, and a horizontal waist-shaped hole is opened in the middle The hole is used as the long slot hole (6.2) of the main connecting plate, and the upper and lower side edges are provided with the main connecting plate groove (6.3); the bolt holes (6.1) of the main connecting plate at both ends pass through the high-strength bolts (8) and the main grooves of the two prefabricated units respectively. After the steel components (2) are connected, the high-strength bolts (8) pass through the main channel steel web bolt hole (2.5) of the main channel steel component (2) and the main connecting plate bolt hole (6.1) of the main connecting plate (6) in sequence Tighten the connection with the nut (8.2), so that the main channel steel assembly (2) of the prefabricated unit and the main connecting plate (6) are fixedly connected; In the secondary direction of the prefabricated unit, the secondary channel steel components (3) of the two prefabricated units are connected by a secondary connecting plate (7), and each secondary channel steel component (3) and the secondary connecting plate (7) pass through High-strength bolts (8) are connected; the secondary connecting plate (7) is a strip-shaped steel plate, and the secondary connecting plate (7) is provided with horizontal waist-shaped holes at both ends as the secondary connecting plate bolt hole (7.1), and a horizontal waist-shaped hole is provided in the middle. The hole is used as the long slot hole (7.2) of the secondary connecting plate, and the upper and lower edges of the secondary connecting plate are provided with grooves (7.3); the bolt holes (7.1) of the secondary connecting plate at both ends pass through the high-strength bolts (8) and the secondary grooves of the two prefabricated units respectively. After the steel components (3) are connected, the high-strength bolts (8) pass through the main channel steel web bolt hole (2.5) of the secondary channel steel component (3) and the secondary connecting plate bolt hole (7.1) of the secondary connecting plate (7) in sequence Tighten the connection with the nut (8.2), so that the secondary channel steel assembly (3) of the prefabricated unit and the secondary connecting plate (7) are fixedly connected. 8. A fully assembled reinforced concrete floor slab connected by a steel-concrete composite structure according to claim 1, characterized in that: In the main direction of the prefabricated unit, the overhanging sections of the main channel steel components (2) of two adjacent prefabricated units rest on the load-bearing beam, forming a formwork with the beam surface of the load-bearing beam as the bottom formwork and the sides of two adjacent prefabricated units as In the groove of the side formwork, concrete (11) is poured in the groove, and the additional reinforcement (9) on the main direction slab is buried, and the additional reinforcement (9) on the main direction slab is orthogonal to and bound to the main connecting plate (6), so that Form the connection zone of the steel-concrete composite structure; In the secondary direction of the prefabricated unit, the ends of the cantilevered slabs (1.7) of two adjacent prefabricated units are closely connected together to form a groove, and concrete (11) is poured in the groove, and additional steel bars are buried on the surface of the secondary direction slab (10), the additional steel bar (10) on the secondary direction plate surface is orthogonal to the secondary connecting plate (7) and bound to form the connecting area of the steel-concrete composite structure. 9. The fully assembled reinforced concrete floor slab connected by a steel-concrete composite structure according to claim 8, characterized in that: the load-bearing beam is a reinforced concrete prefabricated beam (4) or an H-shaped steel beam (5) ; When the load-bearing beam is a reinforced concrete prefabricated beam (4), a shear stirrup (4.1) is arranged between every two adjacent main connecting plates (6), so that the shearing stirrup (4.1) and the main connecting plate ( 6) The intervals are arranged alternately, and each shear stirrup (4.1) is fixed and pre-buried in the beam top of the reinforced concrete prefabricated beam (4); When the load-bearing beam is an H-shaped steel beam (5), a shear stud (5.2) is arranged between every two adjacent main connecting plates (6), so that the shearing stud (5.2) and the main connecting plate ( 6) Arranged alternately at intervals, each shear stud (5.2) is fixedly welded to the top surface of the upper flange of the H-shaped steel beam (5).

Images