CN107514083A - Side hangs reinforcing bar band shear key reinforced concrete slab structure and connection method - Google Patents

Abstract

The present invention relates to prefabricated assembled concrete structural construction field, specially a kind of side hangs reinforcing bar band shear key reinforced concrete slab structure and connection method.The structure includes：Shear key, precast concrete bottom plate, concrete cast-in-situ layer, the adjacent side docking of precast concrete bottom plate, each precast concrete bottom plate upper top set shear key and concrete cast-in-situ layer.Easily connect band shear key reinforced concrete slab structure and connection method of the invention, the precast concrete bottom reinforcement of original tape shear key concrete folding plate floor is changed to U-shaped steel muscle, U-shaped steel muscle is encorbelmented stretching from the side of precast concrete bottom plate (abbreviation side hangs reinforcing bar), reinforcing bar and junction steel plate power transmission are hanged by side, therefore make simpler, Path of Force Transfer is simpler clear and definite, and power transmission is more reliable.

Description

Concrete Composite Floor Slab Structure with Side-hung Reinforcement and Shear Keys and Its Connection Method

technical field

The invention relates to the field of prefabricated concrete structure buildings, in particular to a side-hanging reinforced concrete composite floor structure with shear keys and a connection method.

Background technique

At present, in the actual prefabricated concrete buildings, self-supporting reinforced truss concrete laminated slabs are commonly used in floor slabs. This kind of laminated slab has the disadvantages of thick floor slabs and high engineering cost. In order to solve the above problems, in previous inventions, concrete laminated slabs with shear keys, prefabricated structures and construction methods (publication number CN102839773A), but in this invention, how the concrete laminated slabs with shear keys are not involved How to connect with beams, concrete laminated slab with shear key and concrete laminated slab with shear key. In order to solve the above problems, in the previous invention, the improved concrete laminated slab structure and connection method with shear keys (public number CN104727475A), this kind of structure and connection method mainly adopt the design idea of reinforced concrete, and make construction slightly more complicated.

For this reason, the present invention proposes a concrete laminated floor structure with shear keys connected by side-hung steel bars and a connection method to realize tension transmission between prefabricated components. Quality is easier to guarantee and other advantages.

Contents of the invention

The purpose of the present invention is to provide a side-hung steel bar with shear key concrete laminated floor structure and connection method, to realize the connection between the side-hung steel bar with shear key concrete laminated floor and the beam, and the side-hung steel bar with shear key concrete laminated floor The connection with the side-hanging reinforced concrete laminated floor with shear keys meets the needs of actual engineering design and construction.

Technical scheme of the present invention:

A concrete composite floor structure with side-hanging steel bars and shear keys, the structure includes: shear keys, prefabricated concrete bottom slabs, concrete cast-in-place layers, adjacent sides of the prefabricated concrete bottom slabs are butted, and the top of each precast concrete bottom slab is provided with a Shear key and concrete cast-in-place layer; there are U-shaped connecting reinforcements at the bottom of the precast concrete floor. The U-shaped connecting reinforcements include longitudinal U-shaped reinforcements and transverse U-shaped reinforcements. The longitudinal U-shaped reinforcements and transverse U-shaped reinforcements form a network structure. U-shaped connecting bars.

As for the composite floor slab structure of side-hung steel bars with shear keys, when the side-hung steel bars with shear keys are connected to the composite floor slabs of concrete with side-hung steel bars with shear keys, two adjacent prefabricated Anti-bending moment bars are set across the upper parts of the concrete bottom slabs; when the side-hanging reinforced concrete composite floor with shear keys is connected to the middle beam, anti-bending moment bars are set across the upper parts of two adjacent precast concrete bottom slabs; when When the side-hanging reinforced concrete composite floor with shear key is connected to the side beam, the anti-bending moment bar is spanned between the upper part of the side beam and the upper part of the precast concrete floor.

As for the composite floor slab structure of side-hung steel bars with shear keys, when the side-hung steel bars with shear keys are connected to the composite floor slabs of concrete with side-hung steel bars with shear keys, two adjacent prefabricated The sides of the concrete bottom slabs are connected through matching side hanging steel bars, connecting steel plates and concrete cast-in-place layers; The top of the middle girder is connected through the matching side hanging steel bar, L-shaped connecting steel bar, connecting steel plate and concrete cast-in-place layer; The tops of the side beams are connected by matching side hanging steel bars, L-shaped connecting steel bars, connecting steel plates and cast-in-place concrete layers.

The splicing method of the composite floor slab structure of side-hung reinforcement with shear key, the splicing method between the composite floor of concrete composite floor with side-hung reinforcement with shear key and the composite floor of concrete composite floor with side-hung reinforcement with shear key is as follows:

(1) Hoist the two precast concrete bottom slabs to the predetermined position, the side hanging steel bars on the adjacent sides of the precast concrete bottom slabs are at the same horizontal position, and the two ends of each side hanging steel bar are in close contact with the precast concrete bottom slab respectively, each precast concrete bottom slab There is a vertical part in the middle of the bottom plate; holes reserved on the connecting steel plate are provided on the connecting steel plate, and the reserved holes on the connecting steel plate are arranged horizontally and correspond to the vertical part of the side hanging steel bar, and the connecting steel plate is inserted into the side The vertical part of the hanging steel bar, and the part of the side hanging steel bar extending into the connecting steel plate is welded together with the connecting steel plate, or the part of the side hanging steel bar protruding out of the connecting steel plate is bent downward, so as to complete the slabs of the two precast concrete floors The connection of the bottom reinforcement; at the same time, the upper part of the two adjacent precast concrete bottom slabs spans the anti-moment reinforcement;

(2) The cast-in-place concrete layer is poured on the two prefabricated concrete bottom slabs connected above, and the cast-in-place concrete layer and the precast concrete bottom slab are connected to form a firm structure through shear keys, side hanging steel bars and anti-bending moment bars.

In the splicing method of the concrete laminated floor structure with side-hanging steel bars with shear keys, the part of the side-hanging steel bars protruding from the connecting steel plate is bent downward by 45°.

The splicing method of the side-hanging reinforced concrete laminated floor structure with shear keys, the splicing method of the side-hanging reinforced concrete laminated floors with shear keys and the middle beam are as follows:

(1) During the manufacture of the middle beam, the L-shaped connecting steel bars and stirrups are pre-embedded in the middle beam, and the lower end of the L-shaped connecting steel bars extends into the stirrups, and the diameter of the L-shaped connecting steel bars is not smaller than the diameter of the U-shaped connecting steel bars;

(2) Hoist the two precast concrete bottom slabs to both sides of the center beam, the side bottoms of the two precast concrete bottom slabs are connected to the outer edge line of the beam, the side hanging steel bars of the two precast concrete bottom slabs are at the same horizontal position, and the side hanging The vertical part of the steel bar is in close contact with the vertical part of the L-shaped connecting steel bar in the center beam; the connecting steel plate is inserted into the side hanging steel bar and the L-shaped connecting steel bar, and the side hanging steel bar and the L-shaped connecting steel bar are inserted into the connecting steel bar The part is welded together with the connecting steel plate, or the part of the side hanging steel bar and the L-shaped connecting steel bar extending into the connecting steel plate is bent downward to complete the steel bar connection between the two prefabricated concrete bottom slabs and the middle beam;

(3) The cast-in-place concrete layer is poured on the two prefabricated concrete bottom slabs connected above, and the cast-in-place concrete layer and the precast concrete bottom slab are connected to form a firm structure through shear keys, side hanging steel bars and anti-bending moment bars.

In the splicing method of the side-hanging reinforcement with shear key concrete laminated floor structure, the part of the side-hanging reinforcement and the L-shaped connecting reinforcement extending into the connecting steel plate is bent downward by 45°.

The splicing method of the side-hanging reinforced concrete laminated floor structure with shear keys, the splicing method of the side-hanging reinforced concrete laminated floors with shear keys and side beams are as follows:

(1) During the manufacture of side beams, L-shaped connecting steel bars and stirrups are pre-embedded in the side beams, and the lower end of the L-shaped connecting steel bars extends into the stirrups, and the diameter of the L-shaped connecting steel bars is not less than the diameter of the U-shaped connecting steel bars;

(2) Hoist the prefabricated concrete bottom slab to the side beam, make the vertical part of the L-shaped connecting steel bar in the side beam closely contact with the vertical part of the side hanging steel bar, insert them into the connecting steel plate and weld them together, or connect the side beam The part of the hanging steel bar and the L-shaped connecting steel bar extending into the connecting steel plate is bent downward to complete the tight connection between the precast concrete floor and the side beam; at the same time, an anti-bending moment bar is straddled between the upper part of the side beam and the upper part of the precast concrete floor;

(3) The cast-in-place concrete layer is poured on the above-mentioned connected precast concrete floor, and the cast-in-place concrete layer and the precast concrete floor are connected to form a firm structure through shear keys, side hanging steel bars and anti-bending moment bars.

In the splicing method of the side-hanging steel bar with shear key concrete laminated floor structure, the distance between the end of the precast concrete floor and the edge beam is greater than 100 mm, and the part of the side hanging steel bar and the L-shaped connecting steel bar extending into the connecting steel plate is towards the Bend down 45°.

In the splicing method of the side-hanging reinforced concrete laminated floor structure with shear keys, the four sides of the prefabricated concrete floor are steel support formwork with reserved holes, and the steel support formwork with reserved holes is composed of the same upper and lower steel support formwork. There are reserved holes and fixed steel rings on the central axis of the steel support formwork with reserved holes. Half of the reserved holes distributed between the upper and lower steel bars correspond to the reserved holes. The upper and lower steel bars A fixed steel ring is set at the corresponding position on the outside, and the upper and lower steel bars are connected by inserting the fixed steel bar into the fixed steel ring to form an integral steel support formwork with reserved holes; The end is placed in the reserved hole of the lower side steel bar of the reserved hole steel support formwork, and then the upper side steel bar of the reserved hole steel support formwork is placed correspondingly, and then the fixed steel bar is inserted into the fixed steel bar. Finally, the concrete is poured. After the concrete reaches the expected strength, the fixed steel bars are removed, and the steel support formwork with reserved holes is removed to form a precast concrete floor with side-hung reinforced bars.

Advantage of the present invention and beneficial effect are:

1. The structure and connection method of the side-hanging reinforced concrete laminated slab with shear keys of the present invention is compared with the original concrete laminated slab structure with shear keys: the prefabricated concrete floor of the original concrete laminated slab with shear keys The steel bar is changed to U-shaped steel bar. The U-shaped steel bar is cantilevered from the side of the precast concrete floor (referred to as the side-hanging steel bar), and the force is transmitted through the side-hanging steel bar and the connecting steel plate. more reliable.

2. The structure and connection method of the composite floor slab structure and connection method of side-hanging steel bars with shear keys of the present invention, by fixing the side-hanging steel bars of the prefabricated concrete floor with connecting steel plates, the equivalent transfer of the tensile stress generated by the bending moment of the steel bars at the bottom of the slab is realized; L-shaped steel bars are reserved inside, and the L-shaped steel bars of the beams are connected with the side hanging steel bars of the slabs with connecting steel plates to realize the fixing of the precast concrete floor slab ends on the beams; on-site assembly is simpler and the construction quality is easier to guarantee.

3. The present invention also has the advantages of less on-site wet work, high assembly rate, energy saving and environmental protection, and meets the requirements of green building development.

Description of drawings

Figure 1 is a three-dimensional diagram of a U-shaped connection steel bar.

Figure 2 is a three-dimensional view of the steel support template with reserved holes.

Fig. 3 is a three-dimensional view of the prefabricated concrete floor with shear keys and steel support formwork.

Figure 4 is a three-dimensional view of the prefabricated concrete floor with side-hung reinforcement.

Fig. 5 is a three-dimensional view of joined steel plates.

Fig. 6 is a three-dimensional diagram of the butt joint of two pieces of side-hanging reinforcement prefabricated concrete bottom slab reinforcement.

Fig. 7 is a three-dimensional view of two prefabricated concrete bottom slabs with side hanging steel bars arranged with connecting steel plates.

Fig. 8 is a front view of Fig. 7 .

Fig. 9 is a three-dimensional view of the completed cast-in-place layer in Fig. 8 .

FIG. 10 is a three-dimensional diagram of reinforcement of the center beam 15 .

Fig. 11 The three-dimensional diagram of the main beam with L-shaped connecting reinforcement.

Fig. 12 is a three-dimensional view of the butt joint between the middle beam 15 and the reinforcement of the prefabricated concrete of the side hanging reinforcement.

Fig. 13 is a three-dimensional view of the connection between the side-hanging reinforced precast concrete floor and the main beam with the connecting steel plates arranged.

Figure 14 is a three-dimensional view of the completed connection between the side-hanging reinforced prefabricated concrete bottom slab and the main beam.

Fig. 15 is a three-dimensional diagram of the reinforcement of the edge beam.

Fig. 16 is a three-dimensional view of an edge beam with L-shaped connecting bars arranged.

Fig. 17 is a three-dimensional view of the butt joint of the edge beam and the reinforcement of the side-hung reinforced precast concrete.

Fig. 18 is a three-dimensional view of the connection between the side-hanging reinforced prefabricated concrete bottom slab and the edge beams arranged with connecting steel plates.

Fig. 19 is a three-dimensional view of the connection between the side-hanging reinforced prefabricated concrete floor and the edge beam.

In the figure, 1 steel support template with reserved holes; 2 reserved holes; 3 fixed steel bars; 4 fixed steel rings; 5 shear keys; 7 longitudinal U-shaped steel bars; 10 Prefabricated concrete floor; 11 Connecting steel plate; 12 Reserved holes on connecting steel plate; 13 Anti-bending moment reinforcement; 14 Concrete cast-in-place layer;

detailed description

As shown in Figures 1-19, the composite floor structure of side-hung steel bar with shear key concrete of the present invention mainly includes a shear key 5, a prefabricated concrete floor 10, a cast-in-place concrete layer 14, and the adjacent precast concrete floor 10 The sides are docked, and the top of each precast concrete bottom slab 10 is provided with a shear key 5 and a cast-in-place concrete layer 14 . Wherein, the structure and manufacturing process of the prefabricated concrete base plate 10 are as follows:

As shown in Figures 1-4, the present invention provides shear keys 5 on the precast concrete floor 10, and the distribution of the shear keys 5 is determined according to the shear force and tension that the shear keys 5 need to bear in actual engineering. The four sides of the prefabricated concrete floor 10 are steel support formwork 1 with reserved holes. The steel support formwork 1 with reserved holes is composed of the same upper and lower steel bars. With a reserved hole 2 and a fixed steel ring 4, half of the reserved holes distributed between the upper and lower steel bars correspond to the reserved hole 2, and the fixed steel ring 4 is set on the outer side of the upper and lower steel bars. The steel bar 3 is inserted into the fixed steel ring 4 to connect the upper and lower steel bars to form an integral steel support template 1 with reserved holes. The bottom of the precast concrete floor 10 is provided with U-shaped connecting steel bars, the U-shaped connecting steel bars include longitudinal U-shaped steel bars 7 and transverse U-shaped steel bars 8, and the longitudinal U-shaped steel bars 7 and transverse U-shaped steel bars 8 form a U-shaped network structure. Connect the bars.

During construction, first place the two ends of the longitudinal U-shaped steel bars 7 and the transverse U-shaped steel bars 8 in the reserved holes of the steel bars on the lower side of the reserved hole steel support formwork 1, and then place the reserved holes in the corresponding steel bars. Support the upper steel bars of the template 1, and then insert the fixed steel bars 3 into the fixed steel ring 4 to form a frame structure (see Figure 3). Concrete is poured at last, and after the concrete reaches the expected strength, the fixing steel bars 3 are removed, and the steel supporting formwork 1 with reserved holes is removed to form a prefabricated concrete floor 10 with side-hanging reinforcement.

The thickness of the prefabricated concrete floor is consistent with the height of the steel support formwork 1 with reserved holes, which is half of the actual design thickness of the laminated slab. Determine the shape and size of the shear key according to the tensile force that can be borne by this place is not lower than the tensile force that can be borne by the U-shaped connecting steel bar at the bottom of the slab (Fig. 1). Method (CN102839773A)” and “Improved Concrete Laminated Slab Floor Structure with Shear Keys and Connection Method (CN104727475A)”.

As shown in Figures 1 to 19, the splicing structure and splicing methods of side-hung reinforced concrete laminated slabs with shear keys in engineering structures mainly include three types:

(1) As shown in Figures 5-9, the connection structure and method for the connection between the composite floor slab with side-hanging reinforcement and shear key concrete and the composite floor slab with side-hanging reinforcement and shear key are as follows:

(1) As shown in Fig. 5-Fig. 8, two pieces of prefabricated concrete floor 10 are hoisted to the predetermined position, the side hanging steel bars 9 on the adjacent sides of the precast concrete floor 10 are at the same horizontal position, and the two sides of each side hanging steel bar 9 The ends are in close contact with the precast concrete floor 10 respectively, and the middle part of each precast concrete floor 10 is provided with a vertical part; the connecting steel plate 11 is provided with holes 12 reserved on the connecting steel plate, and the reserved holes 12 on the connecting steel plate are arranged along the horizontal direction, And corresponding to the vertical part of the side hanging steel bar 9, the connecting steel bar 11 is inserted into the vertical part of the side hanging steel bar 9, and the part of the side hanging steel bar 9 extending into the connecting steel bar 11 is welded together with the connecting steel plate 11, or The part of the side hanging steel bar 9 protruding from the connecting steel plate 11 is bent downward by 45°, so as to complete the connection of the steel bars at the bottom of the two prefabricated concrete bottom slabs 10 . At the same time, anti-bending moment tendons 13 are straddled between the upper parts of two adjacent precast concrete floor plates 10 .

(2) As shown in Figure 9, the cast-in-place concrete layer 14 is poured on the above-mentioned two connected prefabricated concrete bottom slabs, and the cast-in-place concrete layer 14 and the precast concrete bottom slab 10 pass through the shear key 5, the side hanging steel bar 9 and the anti-bending moment. Ribs 13 are connected into a solid structure.

This connection method is also applicable to the working condition of butt connection between the end face of the precast concrete bottom slab 10 and the end face of the precast concrete bottom slab 10 .

(2) As shown in Figure 10-Figure 14, the connection structure and method of the side-hanging reinforced concrete composite floor with shear key and the middle beam 15 are as follows:

(1) As shown in Figures 10-11, when the middle beam 15 is manufactured, the L-shaped connecting reinforcement 16 and the stirrup 17 are pre-embedded in the middle beam 15, and the lower end of the L-shaped connecting reinforcement 16 extends into the stirrup 17. The diameter of type connecting reinforcing bar 16 is not less than the diameter of U-shaped connecting reinforcing bar (Fig. 1).

(2) As shown in Fig. 12-Fig. 13, two precast concrete bottom slabs 10 are hoisted to both sides of the center beam 15, the side bottoms of the two precast concrete bottom slabs 10 are connected with the outer edge line of the beam, and the two precast concrete bottom slabs The side hanging steel bars 9 of 10 are at the same horizontal position, and the vertical part of the side hanging steel bars 9 is in close contact with the vertical part of the L-shaped connecting steel bars 16 in the center beam 15; the connecting steel plates 11 are inserted into the side hanging steel bars 9 and L type connecting steel bar 16, and the side hanging steel bar 9 and the L-shaped connecting steel bar 16 stretched into the part of the connecting steel plate 11 and the connecting steel bar 11 are welded together, or the side hanging reinforcing bar 9 and the L-shaped connecting steel bar 16 are stretched into the connecting steel bar 11 The part is bent downward by 45° to complete the reinforcement connection of the two prefabricated concrete base plates 10 and the middle beam 15 .

(3) As shown in Figure 14, the concrete cast-in-place layer 14 is poured on the above-mentioned two connected precast concrete floors, and the concrete cast-in-place layer 14 and the precast concrete floor 10 pass through the shear key 5, the side hanging steel bar 9 and the reverse bending moment. Ribs 13 are connected into a solid structure.

This connection method is also applicable to the connection between the end face of the precast concrete floor 10 and the middle beam 15 .

(3) As shown in Figure 15-Figure 19, the connection structure and method of the side-hanging reinforced concrete composite floor with shear key and side beam 18 are as follows:

(1) As shown in Figures 15-16, when the side beam 18 is manufactured, the L-shaped connecting reinforcement 16 and the stirrup 17 are pre-embedded in the side beam 18, and the lower end of the L-shaped connecting reinforcement 16 extends into the stirrup 17. The diameter of the type connection reinforcement 16 is not less than the diameter of the U-type connection reinforcement.

(2) As shown in Figures 17-18, the precast concrete floor 10 is hoisted onto the edge beam 18, and the distance between the end of the precast concrete floor 10 and the edge beam 18 is greater than 100mm; The vertical part of the connecting steel bar 16 is in close contact with the vertical part of the side hanging steel bar 9, inserted into the connecting steel plate 11 and welded together, or the side hanging steel bar 9 and the L-shaped connecting steel bar 16 are inserted into the part of the connecting steel plate 11 toward Bending down by 45° completes the tight connection between the precast concrete floor 10 and the side beams. At the same time, anti-bending moment tendons 13 are straddled between the upper part of the edge beam 18 and the upper part of the precast concrete floor 10 .

(3) As shown in Figure 19, the cast-in-place concrete layer 14 is poured on the above-mentioned connected precast concrete floor, and the cast-in-place concrete layer 14 and the precast concrete floor 10 pass through the shear key 5, the side hanging steel bar 9 and the anti-bending moment bar 13 connected into a solid structure.

The implementation results show that the present invention: ①The precast concrete floor adopts the steel support formwork with reserved holes, which is more environmentally friendly and convenient to manufacture; The force transmission of the positive bending moment is reliable, and the connection between the precast concrete floor is firm; ③The end of the precast concrete floor and the side beam are connected by the side beam and the plate connecting steel plate, which is convenient and fast for construction, and the connection between the end of the precast concrete floor and the side beam is firm and reliable; ④ Due to the combination of prefabrication and cast-in-place, it reduces the amount of wet work on site, ensures the integrity of the structure, saves the need to make formwork on site, saves energy and protects the environment, meets the development requirements of green buildings, and has a large application space.

Claims (10)

1. A side-hanging reinforcement band shear key concrete composite floor structure is characterized in that the structure comprises: shear key, prefabricated concrete floor, concrete cast-in-place layer, the adjacent sides of the prefabricated concrete floor are butted, each prefabricated A shear key and a concrete cast-in-place layer are arranged on the top of the concrete floor; U-shaped connecting reinforcements are arranged at the bottom of the precast concrete floor, and the U-shaped connecting reinforcements include longitudinal U-shaped reinforcements and transverse U-shaped reinforcements, and longitudinal U-shaped reinforcements and U-shaped connecting steel bars that form a mesh structure. 2. According to claim 1, the composite floor slab structure of side-hung steel bars with shear keys is characterized in that, when the side-hung steel bars with shear keys are used for the composite floor slab and the side-hung steel bars are combined with the concrete composite floor with shear keys When the two adjacent precast concrete floors are connected, anti-bending moment bars are set across the upper parts of the two adjacent precast concrete floors; Anti-bending moment bars are set across between them; when the side-hanging reinforced concrete composite floor with shear keys is connected to the side beams, anti-bending moment bars are set across the upper part of the side beams and the upper part of the precast concrete floor. 3. According to claim 1, the composite floor slab structure of side-hung steel bars with shear keys is characterized in that when the side-hung steel bars with shear keys are used for composite floor slabs and the side-hung steel bars with shear keys are used for composite floor slabs When connecting between two adjacent prefabricated concrete bottom slabs, the sides of two adjacent prefabricated concrete bottom slabs are connected through matching side hanging steel bars, connecting steel plates and concrete cast-in-place layers; The sides of two adjacent prefabricated concrete bottom slabs are connected to the top of the central beam through matching side hanging steel bars, L-shaped connecting steel bars, connecting steel plates and concrete cast-in-place layers; when the side hanging steel bars with shear keys When the beams are connected, the sides of the precast concrete floor and the top of the side beams are connected through matching side hanging steel bars, L-shaped connecting steel bars, connecting steel plates and cast-in-place concrete layers. 4. A splicing method for a side-hanging reinforced concrete composite floor structure with shear keys according to any one of claims 1 to 3, characterized in that, the side-hanging reinforced concrete composite floor with shear keys and the side-hanging reinforced strips The splicing method between shear key concrete laminated slabs is as follows: (1) Hoist the two precast concrete bottom slabs to the predetermined position, the side hanging steel bars on the adjacent sides of the precast concrete bottom slabs are at the same horizontal position, and the two ends of each side hanging steel bar are in close contact with the precast concrete bottom slab respectively, each precast concrete bottom slab There is a vertical part in the middle of the bottom plate; holes reserved on the connecting steel plate are provided on the connecting steel plate, and the reserved holes on the connecting steel plate are arranged horizontally and correspond to the vertical part of the side hanging steel bar, and the connecting steel plate is inserted into the side The vertical part of the hanging steel bar, and the part of the side hanging steel bar extending into the connecting steel plate is welded together with the connecting steel plate, or the part of the side hanging steel bar protruding out of the connecting steel plate is bent downward, so as to complete the slabs of the two precast concrete floors The connection of the bottom reinforcement; at the same time, the upper part of the two adjacent precast concrete bottom slabs spans the anti-moment reinforcement; (2) The cast-in-place concrete layer is poured on the two prefabricated concrete bottom slabs connected above, and the cast-in-place concrete layer and the precast concrete bottom slab are connected to form a firm structure through shear keys, side hanging steel bars and anti-bending moment bars. 5. The splicing method of the side-hanging steel bar with shear key concrete laminated floor structure according to claim 4, characterized in that the part of the side-hanging steel bar protruding from the connecting steel plate is bent downward by 45°. 6. A splicing method of the side-hanging steel bar with shear key concrete laminated floor structure as claimed in claim 1, characterized in that, the splicing method of the side-hanging steel bar with shear key concrete laminated floor and the center beam is as follows: (1) During the manufacture of the middle beam, the L-shaped connecting steel bars and stirrups are pre-embedded in the middle beam, and the lower end of the L-shaped connecting steel bars extends into the stirrups, and the diameter of the L-shaped connecting steel bars is not smaller than the diameter of the U-shaped connecting steel bars; (2) Hoist the two precast concrete bottom slabs to both sides of the center beam, the side bottoms of the two precast concrete bottom slabs are connected to the outer edge line of the beam, the side hanging steel bars of the two precast concrete bottom slabs are at the same horizontal position, and the side hanging The vertical part of the steel bar is in close contact with the vertical part of the L-shaped connecting steel bar in the center beam; the connecting steel plate is inserted into the side hanging steel bar and the L-shaped connecting steel bar, and the side hanging steel bar and the L-shaped connecting steel bar are inserted into the connecting steel bar The part is welded together with the connecting steel plate, or the part of the side hanging steel bar and the L-shaped connecting steel bar extending into the connecting steel plate is bent downward to complete the steel bar connection between the two prefabricated concrete bottom slabs and the middle beam; (3) The cast-in-place concrete layer is poured on the two prefabricated concrete bottom slabs connected above, and the cast-in-place concrete layer and the precast concrete bottom slab are connected to form a firm structure through shear keys, side hanging steel bars and anti-bending moment bars. 7. According to the splicing method of side-hanging steel bar with shear key concrete laminated floor structure according to claim 4, it is characterized in that the part where the side-hanging steel bar and the L-shaped connecting steel bar extend into the connecting steel plate is bent downward by 45°. 8. A splicing method of the side-hanging reinforcement band shear key concrete composite floor structure according to claim 1, wherein the splicing method of the side-hanging reinforcement band shear key concrete composite floor and side beams is as follows: (1) During the manufacture of side beams, L-shaped connecting steel bars and stirrups are pre-embedded in the side beams, and the lower end of the L-shaped connecting steel bars extends into the stirrups, and the diameter of the L-shaped connecting steel bars is not less than the diameter of the U-shaped connecting steel bars; (2) Hoist the prefabricated concrete bottom slab to the side beam, make the vertical part of the L-shaped connecting steel bar in the side beam closely contact with the vertical part of the side hanging steel bar, insert them into the connecting steel plate and weld them together, or connect the side beam The part of the hanging steel bar and the L-shaped connecting steel bar extending into the connecting steel plate is bent downward to complete the tight connection between the precast concrete floor and the side beam; at the same time, an anti-bending moment bar is straddled between the upper part of the side beam and the upper part of the precast concrete floor; (3) The cast-in-place concrete layer is poured on the above-mentioned connected precast concrete floor, and the cast-in-place concrete layer and the precast concrete floor are connected to form a firm structure through shear keys, side hanging steel bars and anti-bending moment bars. 9. According to the splicing method of the side-hanging steel bar shear key concrete laminated floor structure according to claim 6, it is characterized in that, the distance between the end of the precast concrete floor lapped to the edge beam is greater than 100mm, and the side-hanging steel bar and the L The part of the connecting steel bar extending into the connecting steel plate is bent downward by 45°. 10. According to the splicing method of side-hanging reinforced concrete laminated slab structure with shear key according to any one of claims 4 to 9, it is characterized in that the four sides of the prefabricated concrete bottom slab are steel support formwork with reserved holes, The reserved hole steel support formwork is composed of the same upper and lower steel bars. The central axis of the reserved hole steel support formwork has a reserved hole and a fixed steel ring. The reserved holes correspond to the reserved holes, and the fixed steel rings are set at the corresponding positions on the outer sides of the upper and lower steel bars, and the upper and lower steel bars are connected by inserting the fixed steel bars into the fixed steel rings to form an integral steel support formwork with reserved holes; construction , first place the two ends of the longitudinal U-shaped steel bar and the transverse U-shaped steel bar in the reserved hole of the steel support formwork on the lower side of the reserved hole, and then place the corresponding reserved hole in the steel support formwork. Steel bars on the upper side, and then insert the fixed steel bars into the fixed steel ring to form a frame structure; finally pour concrete, and after the concrete reaches the expected strength, remove the fixed steel bars and remove the reserved hole steel support formwork to form side hanging steel bars Precast concrete floor.