CN219033728U

CN219033728U - Novel composite floor slab based on UHPC

Info

Publication number: CN219033728U
Application number: CN202223320294.5U
Authority: CN
Inventors: 黄炜; 王智鹏; 权文立; 苗欣蔚; 陈卓; 王莽; 张瑞康
Original assignee: Xian University of Architecture and Technology
Current assignee: Xian University of Architecture and Technology
Priority date: 2022-12-09
Filing date: 2022-12-09
Publication date: 2023-05-16
Anticipated expiration: 2032-12-09

Abstract

The utility model relates to a novel composite floor slab based on UHPC, which comprises a prefabricated bottom layer, a prefabricated interlayer and a post-pouring concrete layer; the prefabricated bottom layer adopts an UHPC board, and a plurality of embedded bolts are embedded at intervals at the wide edge position of the UHPC board; the prefabricated interlayer is pre-buried in the prefabricated bottom layer, and a concrete layer is poured after the prefabricated interlayer is assembled on the UHPC board to form the composite floor slab. According to the utility model, UHPC is used as the bottom plate, the step of pre-supporting the bottom template in the traditional concrete roof plate pouring process is avoided, and autoclaved aerated concrete blocks are used as filling of the floor plate, so that the advantages of heat preservation, heat insulation and sound insulation of the lightweight aerated concrete are brought into play, the dead weight of the floor plate is lightened to a certain extent, and the earthquake resistance of the structure is improved.

Description

Novel composite floor slab based on UHPC

Technical Field

The utility model belongs to the technical field of assembled buildings, and particularly relates to a novel composite floor slab based on UHPC.

Background

The concrete laminated slab is used as an important component member for assembling the integral concrete structure, and has the advantages of good integrity, high construction speed, template saving, great improvement of building prefabrication rate and assembly rate and the like. However, in actual engineering, the traditional concrete laminated slab has large dead weight, and in an excessively high building structure, the dead weight influences the earthquake resistance of the structure, and the weight of the concrete laminated slab also causes the excessively high transportation and hoisting cost; meanwhile, autoclaved aerated concrete has the functions of light weight, sound insulation, heat insulation and the like, but is widely used as a wallboard because of low strength. The material characteristics of the two materials limit the popularization of the fabricated building to a certain extent, and the traditional common concrete is still mainly used in the material.

In order to solve the above problems, there have been proposed a method of using a cement fiberboard equipped with truss ribs as a floor support plate and post-casting ordinary concrete to make a floor. The following problems still remain: firstly, a large number of connecting pieces are needed for connecting the cement fiber board and the steel bar truss, so that time and labor are consumed; secondly, although the floor carrier plate is made of light weight, the problem that the dead weight of the manufactured floor is too large can not be solved by pouring ordinary concrete in the subsequent working procedures.

Disclosure of Invention

In order to solve the problems in the prior art, the utility model provides a novel UHPC-based composite floor slab. The technical problems to be solved by the utility model are realized by the following technical scheme:

the utility model provides a novel composite floor slab based on UHPC, which comprises a prefabricated bottom layer, a prefabricated interlayer and a post-pouring concrete layer;

the prefabricated bottom layer is a UHPC board, and a plurality of embedded bolts are embedded at intervals at the wide edge position of the UHPC board;

the prefabricated interlayer is pre-buried in the prefabricated bottom layer, and the post-pouring concrete layer is poured after the prefabricated interlayer is assembled on the UHPC board to form a superposed floor slab;

the prefabricated interlayer comprises channel steel, a plurality of autoclaved aerated concrete blocks and a plurality of truss steel bars;

the two channel steels are symmetrically arranged at the position of the broadside on the upper surface of the UHPC board and fixedly connected with the UHPC board through the embedded bolts; the plurality of truss steel bars are arranged on the UHPC board at intervals in parallel along the long side direction, and two ends of the truss steel bars are respectively connected with the upper side of the lower flange of the channel steel; the autoclaved aerated concrete blocks are placed on the UHPC board and are respectively located in the intervals of the truss steel bars.

In one embodiment of the utility model, the truss rebar is disposed perpendicular to the channel.

In one embodiment of the utility model, the distance between the upper side of the lower flange of the channel and the upper surface of the UHPC board is greater than or equal to 15 mm.

In one embodiment of the utility model, the thickness of the autoclaved aerated concrete block is less than or equal to one half of the height of the truss rebar.

In one embodiment of the utility model, the outer contour edge of the channel is greater than or equal to 15 millimeters from both the broad side edge and the long side edge of the corresponding UHPC board.

Compared with the prior art, the utility model has the beneficial effects that:

according to the novel composite floor slab based on the UHPC, the UHPC is used as the bottom plate, so that the step of pre-supporting the bottom template in the traditional concrete roof plate pouring process is avoided, and the workload of site construction is effectively reduced. The autoclaved aerated concrete block is used as filling of the floor slab, so that the use of green building materials in the floor carrier plate is increased, the advantages of heat preservation, heat insulation and sound insulation of the lightweight aerated concrete are brought into play, the dead weight of the floor slab is lightened to a certain extent, the prefabricated component is light, and the earthquake resistance of the structure is improved. The two-side channel steel is used for making up the defect of the aerated concrete in strength, and meanwhile, the truss reinforcing steel bars are welded on the two-side channel steel to replace a simple truss reinforcing steel bar connecting piece, so that the use of the floor support plate connecting piece is reduced.

The foregoing description is only an overview of the present utility model, and is intended to be implemented in accordance with the teachings of the present utility model, as well as the preferred embodiments thereof, together with the following detailed description of the utility model, given by way of illustration only, together with the accompanying drawings.

Drawings

FIG. 1 is a schematic diagram of a UHPC board structure with embedded bolts according to an embodiment of the present utility model;

FIG. 2 is a schematic view of a UHPC board with channel steel secured by pre-embedded bolts in accordance with an embodiment of the present utility model;

fig. 3 is a schematic view of welding truss steel bars on channel steel according to an embodiment of the present utility model;

FIG. 4 is a schematic illustration of a cut autoclaved aerated concrete block resting on a UHPC board in accordance with an embodiment of the utility model;

fig. 5 is a schematic structural view of a new UHPC-based composite floor slab formed from post-cast concrete according to an embodiment of the utility model.

Icon: 1-UHPC board; 2-embedding bolts; 3-channel steel; 4-truss steel bars; 5-autoclaved aerated concrete blocks; 6-post-pouring concrete.

Detailed Description

In order to further explain the technical means and effects adopted by the utility model to achieve the preset aim, the following describes a novel UHPC-based composite floor slab in detail according to the utility model with reference to the attached drawings and the detailed description.

The foregoing and other features, aspects, and advantages of the present utility model will become more apparent from the following detailed description of the preferred embodiments when taken in conjunction with the accompanying drawings. The technical means and effects adopted by the present utility model to achieve the intended purpose can be more deeply and specifically understood through the description of the specific embodiments, however, the attached drawings are provided for reference and description only, and are not intended to limit the technical scheme of the present utility model.

Example 1

Referring to fig. 1 to 5 in combination, fig. 1 is a schematic diagram of a UHPC board structure with embedded bolts according to an embodiment of the present utility model; FIG. 2 is a schematic view of a UHPC board with channel steel secured by pre-embedded bolts in accordance with an embodiment of the present utility model; fig. 3 is a schematic view of welding truss steel bars on channel steel according to an embodiment of the present utility model; FIG. 4 is a schematic illustration of a cut autoclaved aerated concrete block resting on a UHPC board in accordance with an embodiment of the utility model; fig. 5 is a schematic structural view of a new UHPC-based composite floor slab formed from post-cast concrete according to an embodiment of the utility model.

The utility model provides a novel composite floor slab based on UHPC, which comprises a prefabricated bottom layer, a prefabricated interlayer and a post-pouring concrete layer 6; the prefabricated bottom layer adopts an UHPC board 1, and a plurality of embedded bolts 2 are embedded at intervals at the wide edge position of the UHPC board 1; the prefabricated interlayer is pre-buried in the prefabricated bottom layer, and a concrete layer 6 is poured after the prefabricated interlayer is assembled on the UHPC board 1 to form the composite floor slab.

In an alternative embodiment, the UHPC board 1 has a thickness of around 10 mm.

In an alternative embodiment, the prefabricated interlayer comprises channel steel 3, a plurality of autoclaved aerated concrete blocks 5 and a plurality of truss steel bars 4, wherein two channel steel 3 are symmetrically arranged at the position of the broadside on the upper surface of the UHPC board 1 and fixedly connected with the UHPC board 1 through a plurality of embedded bolts 2, and the channel steel 3 is connected with the UHPC board 1 through the embedded bolts 2 at a certain distance.

Notably, the autoclaved aerated concrete block 5 replaces common concrete, reduces the dead weight of the floor support plate, reduces the transportation and hoisting cost of the composite floor slab, and improves the earthquake resistance of the composite floor slab; in addition, the autoclaved aerated concrete block 5 has better heat preservation, heat insulation and sound insulation effects, and is used as a green building material, and the influence of the building material on human health and environmental protection is focused on being lightened.

Further, as the autoclaved aerated concrete block 5 is light in weight and low in strength, the defect of insufficient strength of the autoclaved aerated concrete block 5 is overcome through the UHPC plate 1 and the channel steel 3.

In an alternative embodiment, a plurality of truss steel bars 4 are arranged on the UHPC board 1 at intervals in parallel along the long side direction, two ends of the truss steel bars 4 are respectively connected with the upper side of the lower flange of the channel steel 3, and the truss steel bars 4 reduce the use of connectors between the floor support boards and improve the assembly construction speed.

In an alternative embodiment, a number of autoclaved aerated concrete blocks 5 are placed on the UHPC board 1, each in a separate space of truss steel bars 4.

Further, the autoclaved aerated concrete block 5 is cut to a proper size, and is disposed in a space therebetween in the direction of the truss reinforcement 4.

In this embodiment, the truss reinforcement 4 is disposed perpendicular to the channel 3.

In this embodiment, the distance between the upper side of the lower flange of the channel 3 and the upper surface of the UHPC board 1 is greater than or equal to 15 mm.

In an alternative embodiment, because the two ends of the truss steel bar 4 are respectively welded to the upper sides of the lower flanges of the channel steel 3, a certain distance needs to be ensured between the welding point of the truss steel bar 4 and the UHPC board 1 to ensure reasonable connection strength of the truss steel bar 4, and the distance is called a protection layer; meanwhile, considering the thickness of the lower flange of the channel steel 3, the lower flange of the channel steel 3 is overhead through a plurality of embedded bolts 2, and the distance from the upper surface of the UHPC board 1 is more than or equal to 15 mm.

Further, based on the safety consideration of the splicing and assembling of the composite floor slab, the situation that the composite floor slab collides with beam column steel bars during the splicing and assembling during the assembling is avoided, so that the installation is difficult or the installation strength is not satisfied, and the distance between the outer contour edge of the channel steel 3 and the wide edge and the long edge of the corresponding UHPC board 1 is larger than or equal to 15 mm.

In the present embodiment, since the strength of the autoclaved aerated concrete block 5 is weaker than that of the poured concrete structure, the thickness of the autoclaved aerated concrete block 5 is less than or equal to one half of the height of the truss reinforcement 4 in consideration of the overall strength of the composite floor slab.

In the embodiment, as shown in fig. 1 to 5, the assembly steps of the composite floor slab are that firstly, a plurality of embedded bolts 2 are connected with a UHPC board 1 and a channel steel 3, and the embedded bolts along the vertical direction of the UHPC board 1 are aligned with bolt holes on the channel steel 3, so that position deviation is avoided in the later installation;

secondly, truss steel bars 4 are arranged on the UHPC board 1 at intervals in parallel along the long side direction, two ends of the truss steel bars 4 are respectively connected with the upper sides of the lower flanges of the channel steel 3, so that each welding point is ensured to be firmly welded, the channel steel 3 and the truss steel bars 4 are ensured to be firmly connected, and the strength of a floor slab is ensured;

finally, autoclaved aerated concrete blocks 5 are placed on the UHPC board 1 and are respectively positioned in the intervals of a plurality of truss steel bars 4, and then a concrete layer 6 is poured on the configured floor slab to form the laminated floor slab.

The novel composite floor slab based on the UHPC adopts the UHPC as the bottom plate, avoids the step of pre-supporting the bottom template in the traditional concrete roof plate pouring process, and effectively reduces the workload of site construction. The autoclaved aerated concrete block is used as filling of the floor slab, so that the use of green building materials in the floor carrier plate is increased, the advantages of heat preservation, heat insulation and sound insulation of the lightweight aerated concrete are brought into play, the dead weight of the floor slab is lightened to a certain extent, the prefabricated component is light, and the earthquake resistance of the structure is improved. The two-side channel steel is used for making up the defect of the aerated concrete in strength, and meanwhile, the truss reinforcing steel bars are welded on the two-side channel steel to replace a simple truss reinforcing steel bar connecting piece, so that the use of the floor support plate connecting piece is reduced.

It should be noted that in this document relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in an article or apparatus that comprises the element. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The orientation or positional relationship indicated by "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is merely for convenience of description and to simplify the description, and is not indicative or implying that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the utility model.

The foregoing is a further detailed description of the utility model in connection with the preferred embodiments, and it is not intended that the utility model be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the utility model, and these should be considered to be within the scope of the utility model.

Claims

1. The novel composite floor slab based on UHPC is characterized by comprising a prefabricated bottom layer, a prefabricated interlayer and a post-pouring concrete layer (6);

the prefabricated bottom layer is made of an UHPC board (1), and a plurality of embedded bolts (2) are embedded at intervals in the position of the wide edge of the UHPC board (1);

the prefabricated interlayer is pre-buried in the prefabricated bottom layer, and the post-cast concrete layer (6) is poured after the prefabricated interlayer is assembled on the UHPC board (1) to form a composite floor slab;

the prefabricated interlayer comprises channel steel (3), a plurality of autoclaved aerated concrete blocks (5) and a plurality of truss steel bars (4);

the two channel steels (3) are symmetrically arranged at the position of the broadside on the upper surface of the UHPC board (1) and are fixedly connected with the UHPC board (1) through the embedded bolts (2);

the truss steel bars (4) are arranged on the UHPC board (1) at intervals in parallel along the long side direction, and two ends of the truss steel bars (4) are respectively connected with the upper side of the lower flange of the channel steel (3);

the autoclaved aerated concrete blocks (5) are placed on the UHPC plate (1) and are respectively positioned in the intervals of the truss steel bars (4).

2. The new composite floor slab based on UHPC according to claim 1, characterized in that the truss reinforcement (4) is arranged perpendicular to the channel (3).

3. The novel UHPC-based composite floor slab according to claim 1, characterized in that the distance between the upper side of the lower flange of the channel steel (3) and the upper surface of the UHPC board (1) is greater than or equal to 15 mm.

4. The new composite UHPC-based floor slab according to claim 1, characterized in that the thickness of the autoclaved aerated concrete block (5) is less than or equal to half the height of the truss reinforcement (4).

5. The new type of composite floor slab based on UHPC according to claim 1, characterized in that the distance of the outer contour edge of the channel steel (3) from the wide edge and the long edge of the corresponding UHPC board (1) is greater than or equal to 15 mm.