CN216475805U

CN216475805U - Assembled type T-shaped steel and concrete combined hollow sandwich plate floor system

Info

Publication number: CN216475805U
Application number: CN202122966307.5U
Authority: CN
Inventors: 郭钰; 曾勇; 马克俭; 张华刚; 肖建春
Original assignee: HUNAN JINHAI STEEL STRUCTURE CO Ltd; Guizhou University
Current assignee: HUNAN JINHAI STEEL STRUCTURE CO Ltd; Guizhou University
Priority date: 2021-11-29
Filing date: 2021-11-29
Publication date: 2022-05-10
Anticipated expiration: 2031-11-29

Abstract

The utility model provides an assembled T-shaped steel and concrete combined hollow sandwich plate floor which comprises a group of frame columns arranged along the periphery of a building, wherein square steel pipe shear keys are arranged between adjacent frame columns, and meanwhile, a group of square steel pipe shear keys are arranged in a matrix manner in the range surrounded by the group of frame columns. According to the utility model, the web plates of the upper chords of the T-shaped steel in the T-shaped steel open-web sandwich plate floor are arranged upwards, so that a group of square steel grid grooves which are arranged in a matrix and take the web plates of the upper chords of the T-shaped steel as boundaries are formed on the upper chord layer, then the concrete floor precast slabs are embedded in each square steel grid groove, and finally, the fine stone concrete sheets are poured on the concrete floor precast slabs to form the assembled T-shaped steel and concrete combined open-web sandwich plate floor.

Description

Assembled type T-shaped steel and concrete combined hollow sandwich plate floor system

Technical Field

The utility model relates to an assembled type T-shaped steel and concrete combined hollow sandwich plate floor system, and belongs to the technical field of building structures.

Background

The T-shaped steel hollow sandwich plate floor is an important component of a space steel grid box type structure and is applied to small and high-rise buildings and office buildings. The structural systems of the buildings are generally steel frame primary-secondary beam systems, the arrangement of indoor rooms complies with the principle of 'beams must be arranged on walls', and the rooms cannot be flexibly divided according to the needs of users; when the span is increased, columns are required to be arranged indoors, and the floor system of the traditional structure system is uneven in stress and large in steel consumption. In 2007, developers propose a steel open-web sandwich plate floor system, apply the floor system to engineering practice one after another, and then compile local standard technical rules of steel grid box type structures of assembly open-web floor systems (DBJ43/T351-2019), so that certain effect is achieved. Referring to fig. 4, in order to achieve a fully assembled type, the existing 'steel hollow sandwich plate floor' is assembled by using concrete floor precast slabs, which results in an increase in the thickness of the floor (i.e., the thickness of the floor is the sum of the height of a T-shaped steel hollow beam and the thickness of the concrete floor precast slab), and the concrete floor precast slabs and the T-shaped steel upper chord have no combined action, resulting in lower strength and rigidity of the whole floor and weak earthquake resistance.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects of the existing steel hollow sandwich plate floor, the utility model provides an assembled type T-shaped steel and concrete combined hollow sandwich plate floor which not only improves the assembly rate of the floor structure, but also fully plays the combined action and mechanical effect of reinforced concrete and T-shaped steel and improves the strength and rigidity of the floor.

The technical scheme of the utility model is as follows: an assembled type T-shaped steel and concrete combined hollow sandwich plate floor comprises a group of frame columns arranged along the periphery of a building, square steel tube shear keys are arranged between adjacent frame columns, meanwhile, a group of square steel tube shear keys are arranged in a matrix mode within the range surrounded by the group of frame columns, T-shaped steel upper chords and T-shaped steel lower chords are fixedly connected between the adjacent square steel tube shear keys and between the square steel tube shear keys and the frame columns in parallel, a grid type frame with an upper chord layer and a lower chord layer can be formed, web plates of the upper chords of the T-shaped steel are arranged upwards, a group of square steel grid grooves which are arranged in a matrix mode and take the web plates of the upper chords of the T-shaped steel as boundaries are formed in the upper chord layer, concrete floor prefabricated plates are embedded into each square steel grid groove, and fine aggregate concrete thin plates are poured on the concrete floor prefabricated plates.

Furthermore, a steel bar net piece is arranged in the fine aggregate concrete thin plate, and the steel bar net piece is welded and fixed with the web plate of the upper chord of the T-shaped steel.

Further, the height of the web plate of the upper chord of the T-shaped steel is larger than the thickness of the precast slab of the concrete floor.

Due to the adoption of the technical scheme, the utility model has the advantages that: according to the utility model, the web plates of the upper chords of the T-shaped steel in the T-shaped steel open-web sandwich plate floor are arranged upwards, so that a group of square steel grid grooves which are arranged in a matrix and take the web plates of the upper chords of the T-shaped steel as boundaries are formed on the upper chord layer, then the concrete floor precast slabs are embedded in each square steel grid groove, and finally, the fine stone concrete sheets are poured on the concrete floor precast slabs to form the assembled T-shaped steel and concrete combined open-web sandwich plate floor.

Drawings

FIG. 1 is a plan view of a schematic of the structure of the present invention;

FIG. 2 is a cross-sectional view A-A of FIG. 1;

FIG. 3 is an enlarged view at E of FIG. 1;

FIG. 4 is a schematic structural diagram of a conventional steel hollow sandwich plate floor;

FIG. 5 is a simplified diagram of the calculation of the reduced moment of inertia of a conventional steel hollow sandwich plate floor;

FIG. 6 is a simplified diagram of calculation of the reduced moment of inertia of a flat slab of empty sandwich panel of T-section steel after the T-section steel is inverted on the upper chord;

FIG. 7 is a simplified calculation diagram of the reduced moment of inertia for a fabricated T-shaped steel and concrete composite hollow sandwich panel floor in a positive bending moment region according to the present invention;

FIG. 8 is a simplified calculation diagram of the reduced moment of inertia for the assembled T-section steel and concrete composite open-web sandwich panel floor of the present invention in the hogging moment region.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and examples.

Examples

The schematic diagram of the assembled type T-shaped steel and concrete combined hollow sandwich plate floor system is shown in figures 1-3, and comprises a group of frame columns 1 arranged along the periphery of a building, the square steel tube shear keys 1 are arranged between the adjacent frame columns 1, a group of square steel tube shear keys 2 are arranged in a matrix manner in the range surrounded by the group of frame columns 1, a T-shaped steel upper chord 3 and a T-shaped steel lower chord 4 are fixedly connected between the adjacent square steel tube shear keys 2 and between the square steel tube shear keys 2 and the frame columns 1 in parallel, namely, a grid type frame with an upper chord layer and a lower chord layer can be formed, the web plate of the upper chord 3 of the T-shaped steel is upwards arranged, a group of square steel grid grooves which are arranged in a matrix and take the web plate of the upper chord 3 of the T-shaped steel as a boundary are formed on the upper chord layer, concrete floor precast slabs 5 are embedded in each square steel lattice groove, and fine stone concrete thin slabs 6 are poured on the concrete floor precast slabs 5. A reinforcing mesh 7 is arranged in the fine aggregate concrete sheet 6, and the reinforcing mesh 7 is welded and fixed with the web plate of the T-shaped steel upper chord 3; the height of the web plate of the T-shaped steel upper chord 3 is larger than the thickness of the concrete floor precast slab 5.

In the implementation, the assembled type T-shaped steel and concrete combined hollow sandwich plate floor is an upper and lower chord hollow grid consisting of an upper chord 3 of orthogonal T-shaped steel, a lower chord 4 of T-shaped steel and a shear key 2 of a square steel pipe, the grid size is a,its long side is along x direction with L_xIs represented by m grids a, L_xMa, with short side, i.e. span, denoted by L_yIs represented by n grids (a), L_yWhen m is 5 grids and a is 2m, Lx is 5X 2m is 10m, floor is 100m²The floor is square, and the floor can freely divide rooms and is not limited by 'beams must be arranged on walls'.

When the assembled type T-shaped steel and concrete combined hollow sandwich plate floor is manufactured, firstly a group of frame columns 1 are arranged along the periphery of a building, then arranging square steel tube shear keys 2 between adjacent frame columns 1, arranging a group of square steel tube shear keys 2 in a matrix manner within the range surrounded by the group of frame columns 1, fixedly connecting a T-shaped steel upper chord 3 and a T-shaped steel lower chord 4 between the adjacent square steel tube shear keys 2 and between the square steel tube shear keys 2 and the frame columns 1 in parallel, namely, the grid type frame 1 with an upper chord layer and a lower chord layer is formed, the web plate of the upper chord 3 of the T-shaped steel is upwards arranged, thus, a group of square steel grid grooves which are arranged in a matrix and take the web of the upper chord 3 of the T-shaped steel as a boundary can be formed on the upper chord layer, then embedding concrete floor precast slabs 5 in each square steel lattice groove, and finally pouring fine aggregate concrete sheets 6 on the concrete floor precast slabs 5 to form the hollow sandwich plate floor. And a reinforcing mesh 7 is arranged in the fine aggregate concrete thin plate 6, and before the fine aggregate concrete thin plate 6 is poured, the reinforcing mesh 7 in the fine aggregate concrete thin plate 6 and a web plate of the T-shaped steel upper chord 3 are welded and fixed, so that the fine aggregate concrete thin plate 6 and the T-shaped steel upper chord 3 form a combined action.

According to the utility model, the webs of the upper chords 3 of the T-shaped steel in the T-shaped steel open-web sandwich plate floor are arranged upwards, so that a group of square steel grid grooves which are arranged in a matrix and are bounded by the webs of the upper chords 3 of the T-shaped steel are formed on the upper chord layer, then the concrete floor precast slabs 5 are embedded into each square steel grid groove, and finally, the fine stone concrete sheets 6 are poured on the concrete floor precast slabs 5 to form the assembled T-shaped steel and concrete combined open-web sandwich plate floor.

And (3) stress analysis:

in the drawings 5-8, the heart shape of the upper chord 3 of the T-shaped steel is named as an upper centroid 02, the heart shape of the lower chord 4 of the T-shaped steel is named as a lower centroid O1, h is the height of the open web beam, namely the distance from the upper surface of the upper chord 3 of the T-shaped steel to the lower surface of the lower chord 4 of the T-shaped steel, namely the thickness of the steel structure; h0 is the open web height of the open web beam, namely the available pipeline arrangement clearance of the open web beam, h1 is the height of the upper chord 3 or the lower chord 4 of the T-shaped steel, and h2 is the distance from the bottom surface of the upper chord 3 of the T-shaped steel to the centroid of the fine aggregate concrete thin plate 6; b is the width of the flange of the upper chord 3 or the lower chord 4 of the T-shaped steel when the overlapping plate is not considered for combination, the bent width of the upper flange of the upper chord 3 of the T-shaped steel under the action of concrete combination is considered in the mid-span positive bending moment area of b1, and the bent width of the upper flange of the upper chord 3 of the T-shaped steel under the action of combination is considered in the negative bending moment area of b 2. In FIG. 5, yA is the moment arm from the neutral axis to the upper centroid 02 or the lower centroid O1, 2y_AIs the centroid distance of the upper centroid 02 and the lower centroid O1; ya is the edge distance from the upper centroid 02 or the lower centroid O1 to the flange, yb is the distance from the top of the lower chord 4 of the T-shaped steel to the neutral axis, yc is the distance from the bottom surface of the upper chord 3 of the T-shaped steel to the neutral axis, yd is the distance from the upper centroid 02 to the centroid of the fine aggregate concrete sheet 6, and delta is the thickness of the fine aggregate concrete sheet 6. In FIG. 6, yB is the moment arm from the neutral axis to the upper centroid 02 or the lower centroid O1; in fig. 7, yC and yD are the moment arms of the upper centroid 02 and the lower centroid O1, respectively, to the neutral axis.

Referring to fig. 4 and 5, the schematic view of the prior art steel hollow sandwich plate building cover is shown, the steel hollow sandwich plate building cover is calculated by T-shaped steel hollow beam along x (or y) direction, the thickness is h, and the moment arm is y_aReduced moment of inertia of I_x1。

After the web plate of the upper chord 3 of the T-shaped steel is arranged upwards, the concrete floor precast slab 5 is placed in a square steel lattice groove with the web plate of the upper chord 3 of the T-shaped steel as a boundary, then a fine aggregate concrete thin slab 6 is poured on the concrete floor precast slab 5, the calculation sketch of the hollow web beam of the T-shaped steel is shown in figure 6, the thickness of the hollow web beam is still h, and the force arm y is the force arm y under the condition that the sections of the upper chord T-shaped steel and the lower chord T-shaped steel are not changed_BLess than y_AIts reduced moment of inertia I_x2＜I_x1I.e. a corresponding decrease in stiffness and strength without combined action.

Referring to fig. 7, after the web plate of the upper chord 3 of the T-section steel is arranged upwards, the concrete floor precast slab 5 is placed in a square steel grid groove with the web plate of the upper chord 3 of the T-section steel as a boundary, a fine aggregate concrete sheet 6 is poured on the concrete floor precast slab 5 to form a concrete laminated slab, meanwhile, a steel bar mesh 7 in the fine aggregate concrete sheet 6 is welded with the web plate of the upper chord 3 of the T-section steel, so that the fine aggregate concrete sheet 6, the steel bar mesh 7 and the upper chord 3 of the T-section steel generate a combination effect, the inverted upper chord 3 of the T-section steel increases an upper flange with a width b1 due to the combination effect, the thickness of the inverted upper chord 3 of the T-section steel is increased from h to h + delta/2, delta is the thickness of the concrete laminated slab, and the y moment arm of the inverted upper chord 3 of the T-section steel_CAnd y_DThe respective phases should be increased to ensure that the reduced moment of inertia Ix of the steel hollow beam₃The rigidity and the strength of the T-shaped steel hollow beam are greatly improved due to combination, when the T-shaped steel hollow beam is in the hogging moment area of the floor, the stone concrete sheet 6 has no combination effect in a tension area, but the welded reinforcing mesh 7 still has a combination effect.

Referring to fig. 8, after the web of the upper chord 3 of the T-shaped steel is arranged upwards, the width of the flange is reduced from b1 to b2, and the reduced moment of inertia I exists due to the combination effect_x4，I_x4Is greater than I_x1And I_x2And is less than I_x3The rigidity and the strength of the floor system are increased due to the combined action of the reinforcing mesh 7. The T-shaped steel upper chord 3 is in a floor positive bending moment area, a reinforced concrete panel and the T-shaped steel upper chord 3 are combined (a concrete laminated slab, a reinforcing steel net 7 and the T-shaped steel upper chord 3), concrete in the area is pressed to participate in the combination effect, the combination effect is large (b1 is large), the figure is a floor negative bending moment area, only the reinforcing steel net 7 participates in the combination effect, the combination section is correspondingly reduced, the combination effect is correspondingly reduced (b1 is small), but the combination effect exists at all.

Claims

1. The utility model provides an assembled T shaped steel and concrete combination open-web sandwich panel superstructure, includes a set of frame post (1) that sets up along the building periphery, its characterized in that: the steel-tube shear keys (2) are arranged between adjacent frame columns (1), a group of square steel-tube shear keys (2) are arranged in a matrix mode within the range surrounded by the group of frame columns (1), T-shaped steel upper chords (3) and T-shaped steel lower chords (4) are fixedly connected between the adjacent square steel-tube shear keys (2) and between the square steel-tube shear keys (2) and the frame columns (1) in parallel, a grid type frame with an upper chord layer and a lower chord layer can be formed, web plates of the T-shaped steel upper chords (3) are arranged upwards, a group of square steel grid grooves which are arranged in a matrix mode and take the web plates of the T-shaped steel upper chords (3) as boundaries are formed in the upper chord layer, concrete floor precast slabs (5) are embedded into each square steel grid groove, and fine aggregate concrete thin slabs (6) are poured on the concrete floor precast slabs (5).

2. The assembled type T-shaped steel and concrete combined hollow sandwich plate floor system as claimed in claim 1, wherein: and a steel bar mesh (7) is arranged in the fine aggregate concrete thin plate (6), and the steel bar mesh (7) is welded and fixed with a web plate of the T-shaped steel upper chord (3).

3. The assembled type T-shaped steel and concrete combined hollow sandwich plate floor system as claimed in claim 1, wherein: the height of a web plate of the T-shaped steel upper chord (3) is larger than the thickness of the concrete floor precast slab (5).