CN206859480U - A kind of assembled large span combines steel truss concrete superimposed sheet - Google Patents

Abstract

The utility model discloses an assembled large-span combined steel truss concrete laminated slab, which comprises angle steel, concrete prefabricated layer, main stress bars at the bottom of the slab, distribution bars at the bottom of the slab and steel truss stress bars, and each diagonal steel is arranged longitudinally and Arranged side by side, two angle steels in each pair of angle steels are set back to back and there is a gap between the two angle steel webs, and steel truss reinforcements for connecting the angle steel webs are arranged longitudinally on the top of each pair of angle steels, The main stress ribs at the bottom of the slab are arranged longitudinally, and the upper end of the main stress ribs at the bottom of the slab is flush with the upper surface of the angle steel flange. The webs of the angle steel are connected, and the main stress bars at the bottom of the slab, the distribution bars at the bottom of the slab and the flanges of the angle steel are all in the concrete prefabricated layer. The utility model satisfies the bearing capacity requirements of on-site construction of laminated slabs, realizes large-span support-free construction, and shortens the construction period. The utility model has small plate thickness, convenient hoisting and installation, shortens the construction period, and reduces the dead weight of the whole building.

Description

A prefabricated long-span composite steel truss concrete composite slab

technical field

The utility model belongs to the assembled high-rise building system technology of industrial production, in particular to an assembled large-span composite steel truss concrete laminated plate.

Background technique

The General Office of the State Council issued "Several Opinions on Promoting Housing Industrialization and Improving Housing Quality" in 1999, and on January 1, 2013, in the form of 2013 No. 1 document, forwarded the "Green Building Action Plan" of the Development and Reform Commission and the Ministry of Housing and Urban-Rural Development ", the document focuses on fully understanding the implementation of green building actions, and lists "promoting the industrialization of construction" as one of the ten important tasks.

Prefabricated buildings have promoted the industrialization of construction, and prefabricated floors are an important development direction of prefabricated buildings. At present, the prefabricated floor slabs used in various places mainly include integral prefabricated concrete slabs, floor slabs (profiled steel plates and steel truss floor slabs, etc.) and concrete laminated slabs (reinforced truss laminated slabs and PK laminated slabs, etc.). However, the overall prefabricated concrete slab is very difficult to hoist and install due to its heavy weight, which prolongs the construction period; and the steel formwork of the floor deck is exposed. After pouring concrete, the steel formwork needs to be removed or fire prevention and anticorrosion measures must be taken. Therefore, the construction cost is high, and the maintenance cost increases during use. Compared with the former two, the currently commonly used laminated panels can basically meet the requirements for the construction and use of prefabricated buildings. The laminated panels are lighter in weight and have better connections with beams, columns, walls and other components. The following defects also exist in the construction process:

(1) When the slab span is large, due to the insufficient bearing capacity of the laminated slab, corresponding vertical supports must be set up during the construction process, which leads to the extension of the construction period.

(2) Existing laminated slabs are all prefabricated slabs, and the laminated slabs are floor slabs after being installed on site. Since the thickness of the laminated slabs is the thickness of the floor slabs, the thickness of the laminated slabs is relatively large after the production is completed. Very difficult, prolonging the construction period, and the weight of the whole building is heavy.

Under the background that the country is vigorously promoting the industrialization of construction, it is currently a technical problem to be solved urgently in this industry to minimize the thickness of the slab under the premise of realizing the large-span support-free construction of the laminated slab.

Utility model content

The purpose of the utility model is to provide a large-span composite steel truss-concrete composite slab with large-span support-free construction, small slab thickness, which can greatly reduce the weight of the whole building, convenient and fast construction, and greatly shorten the construction period.

The purpose of this utility model is achieved through the following technical solutions: an assembled large-span composite steel truss concrete composite slab, which is characterized in that it includes two pairs or three pairs of angle steels, concrete prefabricated layers, main stress bars at the bottom of the slab, The distributed reinforcement at the bottom of the slab and the stress reinforcement of the steel truss. Each pair of angle steels is arranged longitudinally and arranged side by side. The top of the angle steel is longitudinally provided with steel truss stress bars for connecting the diagonal steel webs, and the main stress bars at the bottom of the slab are arranged in parallel in the longitudinal direction, and the upper end of the main stress bars at the bottom of the slab is connected to the The upper surface of the flange of the angle steel is flush, and the distributed ribs at the bottom of the plate are arranged in parallel along the transverse direction. , the main stress reinforcement at the bottom of the slab, the distribution reinforcement at the bottom of the slab and the flange of the angle steel are all in the prefabricated concrete layer.

The utility model is provided with main stress ribs and distributed ribs at the bottom of the slab, and an angle steel is added in the stress direction of the slab, which can fully meet the bearing capacity requirements of the composite slab construction on site, and can realize large-span support-free construction , shorten the construction period. In addition, the laminated slab of this utility model is a semi-prefabricated slab, and concrete is cast in place at the construction site to become a floor slab. The floor is self-respecting.

Two pairs or three pairs of angle steels in the utility model are provided, which are determined by joint calculation of the plate span and the specific stress situation.

The utility model can be used not only as a one-way slab, but also as a two-way slab. Therefore, the specific force of the distributed ribs at the bottom of the slab should be determined according to the properties of the laminated slab. The distribution reinforcement at the bottom of the slab is constructed; and when it is a two-way slab, the distribution reinforcement at the bottom of the slab is the stress reinforcement at the bottom of the slab.

As an embodiment of the present invention, the distance between the upper surface of the prefabricated concrete layer and the upper surface of the flange of the angle steel is 20±3mm.

As an embodiment of the present utility model, the distance between the lower surface of the concrete prefabricated layer and the lower surface of the flange of the angle steel is 15±3mm.

As a recommended implementation of the utility model, the distance between each pair of angle steel webs is the diameter of the steel truss reinforcement.

As an embodiment of the present invention, the distributed ribs at the bottom of each plate are segmented, and the end of each segment connected to the web of the angle steel is welded on the web of the angle steel.

As another embodiment of the present utility model, each distribution rib at the bottom of the plate is complete, and a hole is opened on the web of the angle steel corresponding to the position of the distribution rib at the bottom of the plate, and the distribution rib at the bottom of the plate passes through the hole.

In order to ensure that the concrete can fully fill the gap between the webs of each pair of angle steels, as an improvement of the present utility model, there is provided on the webs of the angle steels for pouring concrete into the gaps between the webs of the angle steels The pouring hole, the concrete poured from the pouring hole is integrated with the concrete precast layer and becomes a part of the concrete precast layer.

Compared with the prior art, the utility model has the following remarkable effects:

⑴The utility model is equipped with the main stress ribs and distributed ribs at the bottom of the slab, and several pairs of angle steels are added in the stress direction of the slab, which can fully meet the bearing capacity requirements of the composite slab construction on site, and can realize large-span Support-free construction greatly shortens the construction period.

(2) The laminated slab of this utility model is a semi-prefabricated slab, and the concrete is cast-in-place at the construction site to become a floor slab. Therefore, the laminated slab of this utility model has a small thickness, and is convenient for hoisting and installation, which can further shorten the construction period and greatly reduce the overall cost of the entire building. self-respect.

(3) The laminated slab of this utility model can be used as a one-way slab or a two-way slab. Therefore, the specific force of the distributed ribs at the bottom of the slab should be determined according to the nature of the laminated slab. The reinforcement is the distribution reinforcement at the bottom of the slab conforming to the structure; and when it is a two-way slab, the distribution reinforcement at the bottom of the slab is the stress reinforcement at the bottom of the slab.

(4) The utility model is provided with a pouring hole for pouring concrete into the gap on the web of the angle steel, so as to ensure that the concrete can fully fill the gap between each pair of angle steel webs, and the concrete poured from the pouring hole and the concrete prefabricated layer Integrate and become part of the concrete prefabricated layer.

(5) The utility model has the advantages of simple structure, low manufacturing cost, convenient and quick construction, strong practicability, and is suitable for wide popularization and application.

Description of drawings

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail.

Fig. 1 is the structural representation of the utility model;

Fig. 2 is a schematic cross-sectional view of the utility model.

detailed description

As shown in Figures 1 and 2, it is an assembled large-span composite steel truss concrete composite slab 6 of the present invention, which includes two pairs of angle steel 1, concrete prefabricated layer 2, main stress bars 3 at the bottom of the slab, and distribution bars at the bottom of the slab 4 and steel truss stress bars 5, each pair of angle steels 1 is arranged longitudinally and arranged side by side, the two angle steels in each pair of angle steels 1 are arranged in the opposite direction and there is a gap between the webs 11 of the two angle steels 1, in The top of each pair of angle steels 1 is longitudinally provided with steel truss stress bars 5 for connecting the webs 11 of the pair of angle steels 1, and the distance between the webs 11 of each pair of angle steels 1 is the diameter of the steel truss stress bars 5. The main stress ribs 3 at the bottom of the slab are arranged in parallel in the longitudinal direction. The angle steel 1 is in the same direction as the main stress ribs 3 at the bottom of the slab. The upper surface of the flange 12 of the angle steel 1 is flush, and the distribution ribs 4 at the bottom of the slab are arranged in parallel in the transverse direction. Connected, the main reinforcement 3 at the bottom of the slab, the distribution reinforcement 4 at the bottom of the slab and the flange 12 of the angle steel 1 are all located in the concrete prefabricated layer 2 .

The size of the angle steel 1 can be determined according to different slab spans and the specific stress conditions of the slab. In this embodiment, the slab span is 6000mm×1200mm, the size of the angle steel 1 is L125×80×8, and a set of inverted “T”-shaped angle steel 1 is respectively arranged on the two sides of the laminated plate 6 about 1/5 from the edge of the plate. When the plate width changes, the spacing between the inverted "T"-shaped combined angle steels 1 needs to be readjusted according to the calculation, and all of them need to be welded. The concrete prefabricated layer 2 adopts the concrete with the label C30; the main reinforcement 3 at the bottom of the slab is a third-grade steel with a diameter of 10mm, and the distribution reinforcement 4 at the bottom of the slab is a grade-1 steel with a diameter of 6mm, and the spacing is 250mm; the steel truss reinforcement 5 is a diameter 10mm grade 3 steel.

The distance between the upper surface of the concrete prefabricated layer 2 and the upper surface of the flange 12 of the angle steel 1 is 20±3mm. The distance between the lower surface of the concrete prefabricated layer 2 and the lower surface of the flange 12 of the angle steel 1 is 15±3mm.

In this embodiment, each plate bottom distribution rib 4 is complete, and a hole is opened on the web 11 of the angle steel 1 corresponding to the plate bottom distribution rib 4 , and the plate bottom distribution rib 4 passes through the hole. In other embodiments, the distributed ribs at the bottom of each plate are segmented, and the end of each segment connected to the web of the angle steel is welded on the web of the angle steel. The specific process can be adjusted according to the actual situation.

In order to ensure that the concrete can fully fill the gap between each pair of angle steel webs and make it integrated with the concrete prefabricated layer, a hole for pouring concrete between the pair of angle steel webs is opened on the web 11 of the angle steel 1 The pouring hole in the void, the concrete poured from the pouring hole is integrated with the concrete precast layer and becomes a part of the concrete precast layer. The concrete strength grade of the concrete prefabricated layer 2 is the same as that of the floor slab.

A construction method of the above-mentioned prefabricated large-span combined steel truss concrete laminated slab, comprising the following steps:

Step 1. Prepare the prefabricated long-span composite steel truss concrete laminated slab, specifically:

(1) Build several main stress ribs 3 at the bottom of the slab longitudinally in the mold, arrange the main stress ribs 3 at the bottom of each slab side by side, and erect two or three pairs of angle steels 1 arranged in parallel in the mold longitudinally, each pair The two angle steels in the angle steel 1 are arranged facing away from each other and there is a gap between the webs 11 of the two angle steel 1, and the upper end of the main stress rib 3 at the bottom of the plate is flush with the upper surface of the flange 12 of the angle steel 1;

(2) Build several slab bottom distribution ribs 4 horizontally arranged side by side above the main stress reinforcement 3 of the slab bottom, and connect the slab bottom distribution ribs 4 with the web 11 of the angle steel 1;

(3) At the top of each pair of angle steels 1, a steel truss stress bar 5 is arranged longitudinally, and the steel truss stress bars 5 are connected to the web 11 of the pair of angle steels 1;

(4) pouring concrete into the mould, pouring the distribution bars 4 at the bottom of the slab, the main stress bars 3 at the bottom of the slab, and the flange 12 of the angle steel 1 into the concrete to form the prefabricated concrete layer 2;

On the web 11 of the angle steel 1, there is a pouring hole for pouring concrete into the gap between the webs 11 of the pair of angle steel 1, and the concrete poured from the pouring hole is integrated with the concrete precast layer to become the concrete precast layer. a part;

Step 2, transporting the prepared laminated panels to the construction site;

Step 3. Hoist the laminated panels transported to the construction site to the installation location;

Step 4, bind the gluten reinforcement mesh of the floor slab above the laminated slab, that is, bind the gluten reinforcement mesh above the distributed reinforcement at the bottom of the laminate slab, wherein the steel truss stress reinforcement of the laminate slab is used as a part of the floor slab gluten reinforcement mesh;

Step 5. Concrete integrated pouring is performed according to the design thickness of the floor slab.

In other embodiments, three pairs of angle steels can also be set, which are determined by joint calculation of the plate span and specific stress conditions.

The utility model can be used not only as a one-way slab, but also as a two-way slab. Therefore, the specific force of the distributed ribs at the bottom of the slab should be determined according to the properties of the laminated slab. The distribution reinforcement at the bottom of the slab is constructed; and when it is a two-way slab, the distribution reinforcement at the bottom of the slab is the stress reinforcement at the bottom of the slab.

The implementation of the utility model is not limited thereto. According to the above content of the utility model, according to the common technical knowledge and conventional means in this field, without departing from the above-mentioned basic technical idea of the utility model, the utility model also has other various features. Modifications, replacements or changes in form all fall within the protection scope of the utility model rights.

Claims (7)

1. A prefabricated large-span combined steel truss concrete laminated slab is characterized in that: it comprises two pairs or three pairs of angle steels, concrete prefabricated layers, main stress bars at the bottom of the slab, distribution bars at the bottom of the slab and steel truss stress bars, Each pair of angle steels is vertically arranged and arranged side by side. Two angle steels in each pair of angle steels are arranged facing away from each other and there is a gap between the webs of the two angle steels. For the steel truss stress tendons of the angle steel web, the main stress tendons at the bottom of the slab are arranged in parallel in the longitudinal direction, and the upper ends of the main stress tendons at the bottom of the slab are flush with the upper surface of the angle steel flange. The distribution ribs at the bottom of the slab are set as several pieces arranged side by side along the horizontal direction, the distribution ribs at the bottom of the slab are located on the main stress ribs at the bottom of the slab and connected with the web of the angle steel, the main stress ribs at the bottom of the slab, the plate bottom Both the bottom distribution reinforcement and the flange of the angle steel are in the concrete prefabricated layer. 2. The prefabricated long-span composite steel truss concrete composite slab according to claim 1, characterized in that: the distance between the upper surface of the concrete prefabricated layer and the upper surface of the flange of the angle steel is 20±3mm. 3. The prefabricated long-span composite steel truss concrete composite slab according to claim 2, characterized in that: the distance between the lower surface of the concrete prefabricated layer and the lower surface of the flange of the angle steel is 15±3mm. 4. The prefabricated long-span composite steel truss concrete composite slab according to claim 3, characterized in that: the distance between each pair of angle steel webs is the diameter of the steel truss reinforcement. 5. The prefabricated large-span composite steel truss concrete laminated slab according to claim 4, characterized in that: the distribution bars at the bottom of each slab are segmented, and the end of each segment connected to the web of the angle steel is welded to the web of the angle steel superior. 6. The prefabricated long-span composite steel truss concrete composite slab according to claim 4, characterized in that: the distributed reinforcement at the bottom of each slab is complete, and the position corresponding to the distributed reinforcement at the bottom of the slab on the web of the angle steel A hole is opened, and the distributed ribs at the bottom of the board pass through the hole. 7. The prefabricated long-span composite steel truss concrete composite slab according to claim 5 or 6, characterized in that: the webs of the angle steels are provided with gaps for pouring concrete into the webs of the angle steels The pouring hole, the concrete poured from the pouring hole is integrated with the concrete precast layer and becomes a part of the concrete precast layer.