CN108643428B

CN108643428B - But height-adjusting's assembled precast concrete coincide floor

Info

Publication number: CN108643428B
Application number: CN201810499340.1A
Authority: CN
Inventors: 刘学春; 崔付园; 邓玉萍; 强申; 王小青
Original assignee: Beijing University of Technology; China Railway Construction Group Co Ltd
Current assignee: Beijing University of Technology; China Railway Construction Group Co Ltd
Priority date: 2018-05-23
Filing date: 2018-05-23
Publication date: 2020-03-20
Anticipated expiration: 2038-05-23
Also published as: CN108643428A

Abstract

The utility model provides an adjustable high assembled precast concrete coincide floor, includes angle steel, steel bar truss, L shape lead screw, concrete and nut. The member A1 is composed of angle steel, concrete and steel bar truss, and holes are reserved on two sides of the precast slab along the beam direction. A1 is manufactured in a factory and assembled on site in a hoisting mode. The cross rods of the L-shaped screw rods are hung on the upper surface of the beam, and the vertical rods penetrate through the holes in the prefabricated plate and are screwed down through nuts. After hoisting, the height of the precast slab can be adjusted by adjusting the nuts on the L-shaped lead screws, the relative positions of the floor slabs and the beams are adjusted, the lower surfaces of the floor slabs are flush, and the hoisting problem caused by uneven surfaces of concrete members is solved. The connection mode hides partial beam height and increases the net height of the structural layer. The steel bar truss in the precast slab enhances the cohesive force of the new and old concrete layers and improves the overall performance of the laminated floor slab. The prefabricated slab and the beam are hoisted on site through the L-shaped lead screw and the nut, and the concept of the fabricated building is met.

Description

But height-adjusting's assembled precast concrete coincide floor

Technical Field

The invention belongs to the field of building structural members, and is suitable for fabricated concrete buildings.

Background

The planning of the fabricated building is intensively released since 2015, and the 'industrial building evaluation standard' released at the end of 2015 determines 2016 to comprehensively popularize the fabricated building in 2016 and makes breakthrough progress. The guidance suggestion about the rapid development of the prefabricated building discharged from the state department in 2016 requires the development of the prefabricated buildings such as the prefabricated concrete structure and the steel structure according to local conditions, and the adjustment and the upgrade of the industrial structure are promoted.

The precast concrete composite floor slab is an assembled integral floor slab formed by laminating a permanent template and an upper cast-in-place layer by adopting a precast concrete thin plate at the bottom, has the advantages of good integrity, large rigidity, good crack resistance, no increase of reinforcing steel bar consumption, template saving and the like of the cast-in-place floor slab, can be built in a precast assembly mode to the maximum extent, represents the development direction of national building industrialization, and has the following defects in the existing precast concrete composite floor slab form:

1) the superimposed floor is placed on the beam through the studs or bolts welded on the upper flange of the beam, the whole beam height is exposed outside, the net height of the structural layer is reduced, and the attractiveness is influenced.

2) The laminated floor slab is hoisted in blocks, and the surface of the floor slab is not level after hoisting due to the manufacturing hoisting error of the components.

The invention provides a novel height-adjustable precast concrete composite floor slab form by combining the existing composite floor slab form and aiming at the defects of the existing composite floor slab form. After hoisting, the height position of the precast slab is adjusted before the post-cast layer is poured, and the relative position of the floor slab and the beam is flexibly adjusted; the suspension effect of the L-shaped screw rod is utilized to conceal partial beam height, so that the net height of the structural layer is increased, the integrity of the floor slab and the beam is enhanced, unnecessary material waste is reduced, and the spatial arrangement of the structure is more flexible and attractive; the problem that the hoisted floor slab is not on the same horizontal plane due to the fact that the surface of the concrete beam or the wall body is uneven is solved; the truss-shaped steel bars in the prefabricated slabs not only enhance the bonding force of the new and old pouring layers of the laminated floor slabs and improve the shearing resistance of the floor slabs, but also facilitate pipeline burying and avoid secondary hole opening.

Disclosure of Invention

The invention provides a height-adjustable assembly type precast concrete composite floor slab, which aims to overcome the technical defects of the existing composite floor slab, improve the assembly precision of components and enlarge the application range of the components while ensuring the safety and reliability of the structure.

The technical scheme of the invention is as follows:

1. the utility model provides a but height-adjusting assembled precast concrete coincide floor which characterized in that: the floor form comprises: the steel angle fixing device comprises angle steel 1, a steel bar truss 2, an L-shaped screw rod 3, concrete 4 and a nut 5;

2. the angle steel 1 is placed at the bottoms of the two sides of the precast slab along the beam direction, the steel bar trusses 2 are distributed at the bottoms of the concretes 4, holes are reserved in the corresponding positions of the holes punched in the angle steel 1 to form a member A1 when the angle steel 1, the concretes 4 and the steel bar trusses 2 are integrally poured;

3. the cross rod of the L-shaped screw rod 3 is hung on the upper surface of the beam, and the vertical rod of the L-shaped screw rod 3 passes through the reserved hole of the component A1 and is screwed down through the nut 5.

4. The L-shaped screw rods 3 are distributed on two sides of the beam slab connection reasonably, and the cross rods of the screw rods have enough length to ensure that the floor slab can be stably hung on the two side beams during hoisting.

Advantageous effects

The height-adjustable assembled precast concrete composite floor form has the outstanding advantage that

1) The height of the prefabricated floor slab can be adjusted, the height difference of the floor slab during manufacturing and hoisting is flexibly adjusted, the problem that the surface of the floor slab is not horizontal after hoisting due to the fact that the surface of a concrete member beam or a wall body is not flat is solved, and the lower surface of each floor slab is parallel and level after hoisting is guaranteed.

2) The relative position of the composite floor slab and the beam is controlled and adjusted by adjusting the height position of the prefabricated floor slab.

3) The composite floor slab is hung on the beam, so that part of the beam height is hidden, the integrity of the beam slab is enhanced, the net height of the structural layer is increased, and the structure is more flexible and attractive in arrangement.

4) The arrangement of the steel bars in the truss form increases the bonding force of the superposed surfaces of the floor slabs and improves the overall performance of the floor slabs, particularly the shearing resistance.

Drawings

FIG. 1 is a structural component view of component A1 of the present invention;

FIG. 2 is a schematic diagram of the connection between an L-shaped lead screw and a beam concrete beam or a wall body, the form of components is not limited, and a rectangular concrete beam is taken as an example and angle steel is adopted;

FIG. 3 is a schematic view of a steel bar truss of the present invention;

FIG. 4 is a schematic overview of the connection of the member A1 of the present invention to a concrete beam;

in the figure, 1-angle steel; 2-steel bar truss; 3-L-shaped lead screw; 4-concrete; 5-nut.

Detailed Description

The following describes a specific embodiment of the height-adjustable fabricated precast concrete composite floor slab of the present invention with reference to the accompanying drawings 1 to 4.

As shown in the attached drawings, the height-adjustable assembly type precast concrete composite floor slab comprises angle steel 1, a steel bar truss 2, an L-shaped screw rod 3, concrete 4 and nuts 5.

The angle steel 1, the concrete 4 and the steel bar truss 2 form a member A1 together, and the manufacturing of A1 is completed in a factory; the steel bar truss 2 is distributed at the bottom of the precast slab and used as a stress bar; two angle steels are arranged at the bottoms of two sides of the precast slab along the beam direction, and holes are formed in the angle steels 1 before pouring; when the precast slab is poured, holes with the same size are reserved in the positions, corresponding to the holes of the angle steel 1, on the precast slab; when in site hoisting, the cross rod of the L-shaped screw rod 3 is hung on the upper surface of the beam; and (3) a vertical rod of the L-shaped screw rod 3 penetrates through a hole on the A1, is screwed down through a nut 5, and then is subjected to formwork pouring of a post-pouring layer of the laminated floor slab.

In the construction process of the site, according to the stress and force transmission characteristics of the floor slab, the length of the cross rod of the L-shaped screw rod is more than half of the width of the beam, the floor slab can be stably hung on the two side beams, and the subsequent formwork erection pouring of a cast-in-place layer is completed. The height of member a1 is determined by the overall thickness of the composite floor and the relative position of the floor and beams.

It should be noted that the above is merely illustrative of the present invention and does not limit the scope of the present invention, and the practice of the present invention is not limited thereto.

Claims

1. The utility model provides a but height-adjusting assembled precast concrete coincide floor which characterized in that: the laminated floor slab comprises angle steel (1), a steel bar truss (2), an L-shaped screw rod (3), a concrete precast slab and a nut (5); the steel bar trusses (2) are distributed at the bottoms of the concrete precast slabs and serve as stress bars, the angle steels (1) are arranged at the bottoms of two sides of the concrete precast slabs along the beam direction, the angle steels and the concrete precast slabs are poured together to form a member A1, and a hole is reserved in the member A1 along the beam length direction; a cross rod of the L-shaped screw rod (3) is hung on the upper surface of the beam, a vertical rod of the L-shaped screw rod penetrates through a reserved hole on the member A1 and is screwed down on the lower part of the member A1 through a nut (5); the end of the member A1 is tightly pressed against the side surface of the concrete beam or wall; the relative position of the laminated floor slab and the beam is adjusted by adjusting the height of the nut adjusting component A1 on the L-shaped screw rod to make the lower surface of the laminated floor slab level.

2. The composite floor slab of claim 1, wherein: the height of the concrete precast slab is adjusted by adjusting the nut on the L-shaped screw rod, so that the assembly problem caused by uneven surface of the concrete precast slab is solved, and the assembly precision of the concrete precast slab is improved.

3. The composite floor slab of claim 1, wherein: the suspension effect of the L-shaped screw rod is utilized, the height of a part of beams is hidden, and the net height of the structural layer is increased.

4. The composite floor slab of claim 1, wherein: the width of the cross bar of the L-shaped screw rod exceeds half of the width of the beam.