Assembled integral type hollow floor system based on prefabricated bottom plate

Abstract

The prefabricated bottom plate-based assembled integral hollow floor system comprises prefabricated reinforced concrete bottom plates which can be spliced with one another, splicing seam connecting pieces used for butt joint are arranged at the splicing ends of the prefabricated reinforced concrete bottom plates, and the prefabricated reinforced concrete bottom plates are spliced with one another to form splicing seams distributed in the longitudinal and transverse directions; bottom plate steel bars are arranged in the prefabricated reinforced concrete bottom plates and extend out of the prefabricated reinforced concrete bottom plates, the extending steel bars of the adjacent prefabricated reinforced concrete bottom plates and the abutted seam connecting pieces are in butt joint at abutted seams respectively, and concrete is cast in place at the abutted seams to form concrete beam ribs. The risk that concrete pouring of the lower flange of the cast-in-place concrete hollow floor is not compact and segregated is thoroughly eliminated, the risk that a filling body of the cast-in-place concrete hollow floor floats upwards is thoroughly eliminated, the integrity of the hollow floor and the construction quality of a concrete structure can be reliably guaranteed, and consumption formworks are completely avoided.

Description

Technical Field

[0001] The invention relates to a concrete hollow floor structure technology, in particular to an assembled integral hollow floor based on a prefabricated bottom plate. Background Art

[0002] Hollow floor is a kind of cast-in-place reinforced concrete hollow floor; also called cast-in-place beamless hollow floor, which is a hollow floor without visible beams cast in place after installing the core mold product. Hollow floor includes steel bars, concrete, and core molds. The core molds are buried in reinforced concrete, and the core molds are filled with lightweight materials or are lightweight materials themselves. Cast-in-place concrete hollow floor is an effective means to solve the design of large-span floor structures. It has the advantages of high bending stiffness, small structural height, fast construction, and relatively low comprehensive cost. However, when using lightweight fillers, it is very easy to float, resulting in uncontrollable thickness of the upper and lower flanges of the hollow floor section, displacement of steel bars, and then cracking of concrete and even affecting the bearing capacity safety of the floor; when using heavier fillers, the deadweight of the structure will increase, reducing the technical and economic advantages of the hollow floor; in addition, due to the influence of the filling body covering, when the thickness of the lower flange is thin, there is a risk of pouring quality such as the fullness and uniformity of the concrete.

[0003] Therefore, it is necessary to completely eliminate the risks of loose pouring and segregation of the lower flange concrete of the cast-in-place concrete hollow floor, and completely eliminate the risk of floating of the filling body of the cast-in-place hollow floor, so as to reliably ensure the integrity of the hollow floor and the construction quality of the concrete structure, and completely avoid the use of consumable formwork. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide an assembled integral hollow floor based on a prefabricated base plate, which completely eliminates the risk of loose casting and segregation of concrete at the lower flange of the cast-in-place concrete hollow floor, and completely eliminates the risk of floating of the filling body of the cast-in-place hollow floor, can reliably ensure the integrity of the hollow floor and the construction quality of the concrete structure, and completely avoid the use of consumable formwork.

[0005] The assembled integral hollow floor based on the prefabricated bottom plate of the present invention comprises prefabricated reinforced concrete bottom plates that can be spliced ​​with each other, the splicing ends of the prefabricated reinforced concrete bottom plates are provided with joint connectors for butt jointing, the prefabricated reinforced concrete bottom plates are spliced ​​with each other to form joints distributed in the longitudinal and transverse directions, the prefabricated reinforced concrete bottom plates are provided with bottom plate steel bars extending outwards of the plates, the protruding steel bars of adjacent prefabricated reinforced concrete bottom plates and the joint connectors are respectively butt jointed at the joints, and concrete is cast in situ at the joints to form concrete beam ribs;

[0006] Further, the joint connector is an L-shaped structure in cross section, the vertical side of the L-shaped structure is connected to the prefabricated reinforced concrete bottom plate, and the horizontal side is butted at the joint;

[0007] Furthermore, the horizontal edge of the joint connector is arranged flush with the bottom edge of the prefabricated reinforced concrete bottom plate, and the protruding steel bars of the prefabricated reinforced concrete bottom plate are butted against the top of the joint connector;

[0008] Furthermore, the joint connector is made of cement material, and the joint connector is integrally formed with the prefabricated reinforced concrete base plate;

[0009] Furthermore, the bottom plate steel bars of the prefabricated reinforced concrete bottom plate include bottom plate upper steel bars and bottom plate lower steel bars, the bottom plate upper steel bars and bottom plate lower steel bars form an orthogonal bidirectionally distributed mesh structure, and the steel bar ends of the bottom plate upper steel bars and bottom plate lower steel bars are bent toward each other;

[0010] Furthermore, longitudinal steel bars and stirrups are provided in the joints of the prefabricated reinforced concrete bottom plate;

[0011] Furthermore, the steel bars on the upper layer of the bottom plate and the lower layer of the bottom plate in the same direction are arranged at equal intervals and offset relative to the geometric center of the prefabricated bottom plate. During on-site installation, adjacent prefabricated bottom plates can be accurately assembled by rotating 180°.

[0012] Furthermore, a lightweight filler is provided on the prefabricated reinforced concrete bottom plate, and the lightweight filler is located in the area formed by the concrete beam rib and the prefabricated reinforced concrete bottom plate;

[0013] Furthermore, an upper flange bidirectional steel mesh is arranged on the lightweight filling body, and then cast-in-place concrete is used to form an upper flange plate that is anchored as a whole with the prefabricated reinforced concrete bottom plate, the lightweight filling body and the concrete beam rib.

[0014] The beneficial effects of the present invention are as follows: the assembled integral hollow floor based on the prefabricated bottom plate of the present invention adopts a prefabricated reinforced concrete bottom plate that can be spliced ​​with each other, and the lightweight filling body is placed on the prefabricated reinforced concrete bottom plate, and is integrally cast with the concrete bidirectional rib beam and the upper flange concrete, and forms an integral node with the bottom plate steel bars in the splicing range of the prefabricated reinforced concrete bottom plate, thereby realizing an assembled integral hollow floor structural system of the prefabricated bottom plate, completely eliminating the risks of loose casting and segregation of the lower flange concrete of the cast-in-place concrete hollow floor, and completely eliminating the risk of floating of the filling body of the cast-in-place hollow floor, which can reliably ensure the integrity of the hollow floor and the construction quality of the concrete structure, and completely avoid the use of consumable formwork. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0016] Figure 1 Schematic diagram of the plan layout of the integral hollow floor structure assembled for the precast concrete base plate;

[0017] Figure 2This is a schematic diagram of the prefabricated reinforced concrete base plate structure;

[0018] Figure 3 for Figure 2 AA section view;

[0019] Figure 4 It is a plan view of the installation of prefabricated reinforced concrete base slab;

[0020] Figure 5 for Figure 4 CC section view;

[0021] Figure 6 This is a schematic diagram of beam rib reinforcement arrangement;

[0022] Figure 7 This is a schematic diagram of the installation of the filling body;

[0023] Figure 8 This is a schematic diagram of the arrangement of the two-way reinforcement of the upper flange;

[0024] Fig. 9 This is a schematic diagram of the cross-section of the assembled integral hollow floor structure after construction is completed. DETAILED DESCRIPTION

[0025] The assembled integral hollow floor based on the prefabricated bottom plate of this embodiment comprises prefabricated reinforced concrete bottom plates 2 which can be spliced ​​with each other. The splicing ends of the prefabricated reinforced concrete bottom plates 2 are provided with joint connectors 3 for butt jointing. The prefabricated reinforced concrete bottom plates 2 are spliced ​​with each other to form joints 10 distributed in the longitudinal and transverse directions. The prefabricated reinforced concrete bottom plates 2 are provided with bottom plate steel bars 4 which extend outwards to the outside of the plate. The protruding steel bars of adjacent prefabricated reinforced concrete bottom plates 2 and the joint connectors 3 are respectively butt jointed at the joints 10. The cast-in-place concrete at the joints is The concrete forms concrete beam ribs; the hollow floor is located on the frame beam 1, and the precast reinforced concrete bottom plates 2 are spliced ​​together through the joint connectors 3 to form the precast bottom plates of the hollow floor and form joints 10 along the longitudinal direction (the span direction of the floor) and the transverse direction (the vertical span direction). The precast reinforced concrete bottom plates 2 are provided with bottom plate steel bars 4, and the ends thereof extend outside the plate. When adjacent precast reinforced concrete bottom plates 2 are butt-jointed, the bottom plate steel bars 4 are spliced ​​together, and the joint connectors 3 are butt-jointed, and concrete is cast in situ at the joints to form concrete beam ribs. Since the joints are distributed longitudinally and transversely, the concrete beam ribs are also distributed longitudinally and transversely, and the concrete beam ribs divide the entire precast bottom plate into a plurality of grids, and the areas are used to set lightweight filling bodies 7. The precast reinforced concrete bottom plates 2 are divided into two categories: square plates and / or rectangular plates, wherein the square plates are the main plate types in the floor grids, and the rectangular plates are the supplementary plate types. The combination of the two can complete the arrangement of a rectangular plane hollow floor structure with an arbitrary aspect ratio (such as Figure 1As shown). The side length of the square precast reinforced concrete bottom plate 2 is equal to the long side of the rectangular precast reinforced concrete bottom plate 2. By properly selecting the side length of the precast reinforced concrete bottom plate 2, the precast reinforced concrete bottom plate 2 can cover the span range required by the design.

[0026] In this embodiment, the joint connector 3 is an L-shaped structure in cross section, the vertical edge of the L-shaped structure is connected to the precast reinforced concrete base plate 2, and the horizontal edge is butted at the joint; the vertical edge of the L-shaped structure is located on the precast reinforced concrete base plate 2 as a frame, the vertical edge of the L-shaped structure is flush with the upper edge of the precast reinforced concrete base plate 2, and the horizontal edge of the L-shaped structure is used for the butt joint of adjacent precast reinforced concrete base plates 2, and after the two adjacent horizontal edges are aligned and spliced, a "V-shaped" notch is formed at the splicing point to facilitate the strengthening of the anchoring after pouring the concrete, and at the same time it is used as the bottom formwork of the cast-in-place concrete and anchored in the concrete, the structure has a strong integrity and plays a strengthening role.

[0027] In this embodiment, the horizontal edge of the joint connector 3 is arranged flush with the bottom edge of the precast reinforced concrete base plate 2, and the protruding steel bars of the precast reinforced concrete base plate 2 are connected to the top of the joint connector 3; the horizontal edge of the joint connector 3 can be used as the bottom formwork of the cast-in-place concrete of the beam rib, and can be permanently retained as a protective layer for the steel bars at the bottom of the beam rib.

[0028] In this embodiment, the joint connector 3 is made of cement material, and the joint connector 3 is integrally formed with the prefabricated reinforced concrete base plate 2; it is made of high-performance cement material, and its strength and durability are much higher than the main concrete of the prefabricated reinforced concrete base plate 2.

[0029] In this embodiment, the bottom plate steel bars 4 of the prefabricated reinforced concrete bottom plate 2 include a bottom plate upper steel bar 401 and a bottom plate lower steel bar 402, wherein the bottom plate upper steel bar 401 and the bottom plate lower steel bar 402 are arranged in an orthogonal bidirectional mesh structure, and the ends of the steel bars of the bottom plate upper steel bar 401 and the bottom plate lower steel bar 402 are bent toward each other; the steel bars of the bottom plate upper steel bar 401 and the bottom plate lower steel bar 402 are arranged in different directions, and the upper and lower layers are overall in a crisscross mesh structure, that is, the steel bars of the prefabricated reinforced concrete bottom plate 2 are in an orthogonal bidirectional mesh. The steel bars of the bottom plate upper steel bar 401 and the bottom plate lower steel bar 402 are extended to the outside of the plate and the ends are bent toward each other. When assembled, the bending directions of the ends of the steel bars of the upper steel bar and the bottom plate lower steel bar 402 are opposite, so that the prefabricated reinforced concrete bottom plate 2 has bidirectional force characteristics after anchoring.

[0030] In this embodiment, longitudinal steel bars 5 and stirrups are further provided in the joints of the precast reinforced concrete base plate 2 to enhance the structural strength of the concrete beam ribs at the joints, and the steel bars extending from adjacent precast reinforced concrete base plates 2 are anchored within the width of the beam ribs, and can serve as tensile steel bars at the bottom of the hollow floor slab to participate in the bending resistance of the floor slab, and finally be integrated with the cast-in-place concrete beam ribs and the upper flange plate of the floor slab.

[0031] In this embodiment, the steel bars on the upper steel bars 401 and the lower steel bars 402 of the bottom plate in the same direction are arranged at equal intervals and offset relative to the geometric center of the prefabricated bottom plate (about 1.5 times the diameter of the steel bars). During on-site installation, adjacent prefabricated bottom plates only need to be rotated 180° to be accurately assembled. Whether it is a square plate or a rectangular plate, adjacent standard plates can be assembled by rotating 180° in the plane. No matter it is a bottom plate lower steel bar 402 or a bottom plate upper steel bar 401, there will be no collision. At the same time, the bottom plate steel bars 4 in the same direction are spliced ​​in the same horizontal plane to avoid steel bar collision. Figure 4 shown.

[0032] In this embodiment, a lightweight filler 7 is provided on the precast reinforced concrete base plate 2, and the lightweight filler 7 is located in the area formed by the concrete beam rib and the precast reinforced concrete base plate 2; an upper flange bidirectional steel mesh 9 is provided on the lightweight filler 7, and then cast-in-place concrete is formed to form an upper flange plate that is anchored as a whole with the precast reinforced concrete base plate 2, the lightweight filler 7 and the concrete beam rib. After the lightweight filler 7 is located in the area formed by the concrete beam rib and the precast reinforced concrete base plate 2, the filler can be installed after the beam rib reinforcement (longitudinal reinforcement 5 and stirrups) are installed. Figure 7 After the filling body is installed, the upper flange bidirectional steel mesh 9 can be arranged. Figure 8 As shown, the concrete is poured at last. The cast-in-place beam rib concrete connects the upper and lower flanges into a whole, completing the construction of the prefabricated bottom plate assembled integral hollow floor, completely eliminating the risk of floating of the cast-in-place hollow floor filling body. Fig. 9 shown.

[0033] In this embodiment, before installing the concrete prefabricated floor, the floor should be laid out according to the structural design construction drawing. Four vertical supports 8 are arranged under each prefabricated floor, and an adjustable height screw is set on the top of each support to ensure that the pre-camber of the prefabricated floor is achieved according to the design requirements. Figure 4 As shown in C-C.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. An assembled integral hollow floor based on a prefabricated base plate, characterized in that: It comprises prefabricated reinforced concrete bottom plates which can be spliced ​​with each other, wherein the splicing ends of the prefabricated reinforced concrete bottom plates are provided with joint connectors for butt connection, the prefabricated reinforced concrete bottom plates are spliced ​​with each other to form joints distributed in the longitudinal and transverse directions, the prefabricated reinforced concrete bottom plates are provided with bottom plate steel bars which extend outwardly to the outside of the plates, the extended steel bars of adjacent prefabricated reinforced concrete bottom plates and the joint connectors are respectively butt connected at the joints, and concrete is cast in situ at the joints to form concrete beam ribs.

2. The assembled integral hollow floor based on prefabricated bottom plate according to claim 1 is characterized in that: The joint connector is an L-shaped structure in cross section, the vertical side of the L-shaped structure is connected to the prefabricated reinforced concrete bottom plate, and the horizontal side is butted at the joint.

3. The assembled integral hollow floor based on prefabricated bottom plate according to claim 2 is characterized in that: The horizontal edge of the joint connector is arranged flush with the bottom edge of the prefabricated reinforced concrete bottom plate, and the protruding steel bars of the prefabricated reinforced concrete bottom plate are butted against the top of the joint connector.

4. The assembled integral hollow floor based on prefabricated bottom plate according to claim 3 is characterized in that: The joint connector is made of cement material and is integrally formed with the prefabricated reinforced concrete base plate.

5. The assembled integral hollow floor based on prefabricated bottom plate according to claim 1 is characterized in that: The bottom plate steel bars of the prefabricated reinforced concrete bottom plate include a bottom plate upper steel bar and a bottom plate lower steel bar. The bottom plate upper steel bar and the bottom plate lower steel bar form an orthogonal bidirectionally distributed mesh structure, and the steel bar ends of the bottom plate upper steel bar and the bottom plate lower steel bar are bent toward each other.

6. The assembled integral hollow floor based on prefabricated bottom plate according to claim 5 is characterized in that: The steel bars on the upper and lower layers of the bottom plate and located in the same direction are arranged at equal intervals and offset relative to the geometric center of the prefabricated bottom plate. During on-site installation, adjacent prefabricated bottom plates only need to be rotated 180° for accurate assembly.

7. The assembled integral hollow floor based on prefabricated bottom plate according to claim 6 is characterized in that: Longitudinal steel bars and stirrups are also arranged in the joints of the prefabricated reinforced concrete bottom plate.

8. The assembled integral hollow floor based on prefabricated bottom plate according to claim 1 is characterized in that: A lightweight filling body is arranged on the prefabricated reinforced concrete bottom plate, and the lightweight filling body is located in the area formed by the concrete beam rib and the prefabricated reinforced concrete bottom plate.

9. The assembled integral hollow floor based on prefabricated bottom plate according to claim 8, characterized in that: An upper flange bidirectional steel mesh is arranged on the light filling body, and then cast-in-place concrete is formed into an upper flange plate which is anchored as a whole with the prefabricated reinforced concrete bottom plate, the light filling body and the concrete beam rib.

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