CN109610707B - Assembly structure with parallel and level prefabricated steel beams and floor slab and rapid construction method - Google Patents

Abstract

The invention discloses an assembly structure with a prefabricated steel beam and a floor slab being flush and a rapid construction method. The upper flange of the prefabricated steel beam is in a shape like a Chinese character 'ji', and consists of a horizontal flange, a vertical flange and a top flange; the horizontal flange is provided with a stiffening rib for enhancing the bearing capacity of the beam and preventing the beam from locally deforming and a stud for fixing the floor slab; the studs are prefabricated on the inner sides of the vertical flanges and concrete is precast in a factory and used for restraining deformation of the upper flanges. The floor form is not limited, and the floor and the prefabricated section steel beam are connected together through the welding stud for sleeving the upper flange of the prefabricated section steel beam by the prefabricated steel bar ring in the floor. The invention skillfully realizes the flush design of the prefabricated steel beam and the floor slab, avoids on-site welding, and has the advantages of high space utilization rate, good construction quality and the like; when the prefabricated assembled concrete floor slab or the steel plate concrete composite floor slab is used, a site formwork is not required to be erected and a scaffold is not required to be erected, and the method has the advantages of high construction speed and the like.

Description

A prefabricated steel beam and floor slab are flush with the assembly structure and rapid construction method

technical field

The invention relates to a design and rapid construction method for flush assembly of prefabricated beams and floor slabs used in construction engineering structures, and is especially suitable for construction projects where on-site welding is not easy and high space requirements are required.

Background technique

In the construction engineering structure, the connection method between the prefabricated steel beam and the floor slab is very important, which is directly related to the space utilization, construction progress and project cost. At this stage, most of the prefabricated beam-slab connection methods in my country are to place the plate on the top of the beam in different ways to complete the construction of the floor system, which reduces the space utilization rate to a certain extent. For example, a construction project in Shanghai Qiantan has A requirement was put forward to make the floor slab flush with the upper plane of the steel beam. In addition, the current prefabricated floor connection method involves a large number of on-site welding, on-site formwork, and erecting scaffolding, which easily affects the construction quality and leads to a slow construction progress.

Therefore, a new type of flush design of prefabricated steel beams and floor slabs and a rapid construction method are required to improve space utilization and shorten construction time. Based on this, the present invention proposes a new design of flush assembly of prefabricated steel beams and floor slabs and a rapid construction method thereof, so that the floor slabs are flush with the top surface of the steel beams, and on-site welding can be avoided. The quality is more controllable and other advantages; when using prefabricated concrete floor or steel plate concrete composite floor, there is no need for on-site formwork and scaffolding, and it has the advantages of fast construction.

SUMMARY OF THE INVENTION

The invention proposes an assembly structure and a rapid construction method in which the prefabricated steel beam is flush with the floor slab; the beam-slab system has the advantages of high space utilization, fast construction, on-site welding, and convenient installation.

Technical scheme of the present invention:

An assembly structure in which a prefabricated steel beam is flush with a floor slab is mainly designed for a prefabricated assembled beam-slab substructure, and the prefabricated assembled beam-slab substructure includes a reinforced concrete floor slab 1, a prefabricated steel beam 2, and cast-in-place concrete 3 between the beams and slabs. ;

Part of the end of the steel bar at the end of the reinforced concrete floor 1 is provided with a steel prefabricated ring 4 for connecting the vertical pre-welded studs 5 of the prefabricated steel beam 2;

The upper flange of the described prefabricated steel beam 2 is a "ji" shape, which is composed of a horizontal flange 6, a vertical flange 7 and a top flange 8, wherein the height of the vertical flange 7 is the same as that of the reinforced concrete floor slab 1. Beam stiffeners 9 are arranged on the horizontal flange 6 to improve the rigidity and bearing capacity of the horizontal flange 6 and prevent local deformation of the horizontal flange 6; at the same time, vertical pre-welded bolts are welded on the horizontal flange 6 Nails 5, the positions of the vertical pre-welded studs 5 are in one-to-one correspondence with the steel prefabricated rings 4 at the ends of the reinforced concrete floor 1; It is used to prevent the deformation of the flange under pressure; the inner side of the vertical flange 7 is provided with a horizontal pre-welded stud 11 to fix the concrete 10 inside the flange to prevent it from falling off.

A rapid construction method for flush assembly of prefabricated steel beams and floor slabs. When the floor slab is a reinforced concrete floor slab, the steps are as follows:

Step 1: Prefabricate the reinforced concrete floor slab 1 in the factory, and set the prefabricated ring 4 at the end of the part of the steel bar at the end;

Step 2. Prefabricated steel beam 2 in the factory, set vertical pre-welded studs 5 and stiffeners 9 on its horizontal flange 6, and the position of vertical pre-welded studs 5 is prefabricated with steel bars at the end of reinforced concrete floor 1. The rings 4 are in one-to-one correspondence; the horizontal pre-welded studs 11 are welded on the inner side of the vertical flange 7;

Step 3: Invert the prefabricated steel beam 2 and use its vertical flange 7 and top flange 8 as templates to complete the factory pouring of the concrete 10 inside the flange, wherein the horizontal pre-welded studs 11 are used to fix the concrete inside the flange 10;

Step 4: On-site assembly, the reinforced concrete floor 1 is placed on the horizontal flange 6 of the prefabricated steel beam 2, and the prefabricated rings 4 of the steel bars on the reinforced concrete floor 1 are set on the vertical pre-welded studs 5 in one-to-one correspondence. superior;

Step 5. Using the horizontal flange 6, the vertical flange 7 and the side of the reinforced concrete floor slab 1 of the prefabricated steel beam 2 as templates, pour concrete 3 on site at the space between the prefabricated steel beam 2 and the reinforced concrete floor slab 1 , to complete the construction of the beam-slab sub-structure.

The floor slab is not limited to the prefabricated reinforced concrete floor slab 1. When the floor slab is a cast-in-place floor slab of other forms, if scaffolding and formwork are allowed to be erected on site, the steel prefabricated ring 4 at the end of the floor slab will be prefabricated when the slab reinforcement construction is carried out after the formwork is supported. One-to-one set on the vertical pre-welded studs 5, and then pour concrete on site; if there is no scaffolding on site, use steel plate-concrete composite floor, that is, pre-weld steel prefabricated rings 4 at the ends of steel plates or profiled steel plates in the factory. During on-site assembly, the steel prefabricated ring 4 at the end of the steel plate is set on the vertical pre-welded stud 5 of the prefabricated steel beam 2, and then concrete is poured on site using the steel plate as a template.

The beneficial effect of the present invention is that, compared with the prior art, the method for flushing the prefabricated steel beams and the floor slabs proposed by the present invention: (1) not only can meet the bearing capacity requirements of the beams and slabs, but also improve the space utilization rate of the building; (2) The beams and slabs of the present invention can be prefabricated in factories, and only need to be assembled on site and pour a small amount of concrete to complete the construction, which avoids setting up scaffolding and formwork, realizes rapid construction, and greatly saves construction time; ( 3) The present invention avoids on-site welding and can better guarantee the construction quality.

Description of drawings

FIG. 1 is a schematic diagram of the prefabricated beams and slabs of the present invention in the state of a small amount of in-situ pouring after they are in place.

FIG. 2 is a schematic diagram of the prefabricated beam and slab structure of the present invention after the flush construction is completed.

FIG. 3 is a schematic diagram of the prefabricated steel beam of the present invention before concrete is poured in the factory.

FIG. 4 is a schematic diagram of the prefabricated steel beam of the present invention after concrete is poured in the factory.

FIG. 5 is a schematic diagram of the prefabricated reinforced concrete floor slab of the present invention and its end prefabricated steel bars.

FIG. 6 is a schematic diagram of the state before the concrete is poured on site when a steel plate is used as a template to cast a steel plate-concrete composite floor according to the present invention.

In the picture: 1 reinforced concrete floor; 2 prefabricated steel beams; 3 concrete; 4 steel prefabricated rings; 5 vertical pre-welded studs; 6 horizontal flanges; 7 vertical flanges; 8 top flanges; 9 beam stiffening Rib; 10 Concrete on the inside of beam flange; 11 Horizontal pre-welded studs; 12 Bottom steel plate when the floor is a steel plate-concrete composite floor.

Detailed ways

In order to make the above-mentioned features and advantages of the present invention easier to understand, taking prefabricated reinforced concrete floor slabs as an example, the technical solutions of the present invention are described in detail below in conjunction with the accompanying drawings:

As shown in Figures 1 to 5, prefabricated steel rings 4 are provided at the ends of some steel bars at the ends of the reinforced concrete floor 1, which are used to connect the vertical pre-welded studs 5 of the prefabricated steel beams 2; The flange is in the shape of a "ji" and is composed of a horizontal flange 6, a vertical flange 7 and a top flange 8, wherein the height of the vertical flange 7 is the same as the thickness of the reinforced concrete floor 1; the horizontal flange 6 is arranged on the Beam stiffeners 9 are used to improve the rigidity and bearing capacity of the horizontal flange 6 and prevent local deformation of the horizontal flange 6; The position corresponds to the reinforced prefabricated ring 4 at the end of the reinforced concrete floor 1; The inner side of the vertical flange 7 is provided with a horizontal pre-welded stud 11, which is used to fix the concrete 10 on the inner side of the flange and prevent it from falling off.

Its construction is carried out according to the following steps:

Step 1: Prefabricate the reinforced concrete floor slab 1 in the factory, and set the prefabricated ring 4 at the end of the part of the steel bar at the end;

Step 2. Prefabricated steel beam 2 in the factory, set vertical pre-welded studs 5 and stiffeners 9 on its horizontal flange 6, and the position of vertical pre-welded studs 5 is prefabricated with steel bars at the end of reinforced concrete floor 1. The rings 4 are in one-to-one correspondence; the horizontal pre-welded studs 11 are welded on the inner side of the vertical flange 7;

Step 3: Invert the prefabricated steel beam 2 and use its vertical flange 7 and top flange 8 as templates to complete the factory pouring of the concrete 10 inside the flange, wherein the horizontal pre-welded studs 11 are used to fix the concrete inside the flange 10;

Step 4: On-site assembly, the reinforced concrete floor 1 is placed on the horizontal flange 6 of the prefabricated steel beam 2, and the prefabricated rings 4 of the steel bars on the reinforced concrete floor 1 are set on the vertical pre-welded studs 5 in one-to-one correspondence. superior;

Step 5. Using the horizontal flange 6, the vertical flange 7 and the side of the reinforced concrete floor slab 1 of the prefabricated steel beam 2 as templates, pour concrete 3 on site at the space between the prefabricated steel beam 2 and the reinforced concrete floor slab 1 , to complete the construction of the beam-slab sub-structure.

Claims (3)

1. An assembly structure with a prefabricated steel beam and a floor slab which are parallel and level is characterized by comprising a reinforced concrete floor slab (1), prefabricated steel beams (2) and cast-in-place concrete (3) among beam slabs;

the end of part of the steel bars at the end part of the reinforced concrete floor (1) is provided with a steel bar prefabricated ring (4) for connecting vertical pre-welded studs (5) of the prefabricated steel beam (2);

the upper flange of the prefabricated section steel beam (2) is in a shape like a Chinese character 'ji', and consists of a horizontal flange (6), a vertical flange (7) and a top flange (8), wherein the height of the vertical flange (7) is the same as the thickness of the reinforced concrete floor slab (1); beam stiffening ribs (9) are arranged on the horizontal flanges (6) and used for improving the rigidity and the bearing capacity of the horizontal flanges (6) and preventing the horizontal flanges (6) from local deformation; meanwhile, vertical pre-welding studs (5) are welded on the horizontal flanges (6), and the positions of the vertical pre-welding studs (5) correspond to the reinforcement prefabricated circular rings (4) at the end parts of the reinforced concrete floor (1) one by one; the inner space formed by the vertical flange (7) and the top flange (8) is poured with flange inner side concrete (10) for preventing the flanges from deforming under the compression state; the horizontal prewelding stud (11) is arranged on the inner side of the vertical flange (7) and used for fixing the concrete (10) on the inner side of the flange and preventing the concrete from falling off.

2. The rapid construction method of an assembly structure in which a precast steel girder is flush with a floor slab as claimed in claim 1, when the floor slab is a precast reinforced concrete floor slab, comprising the steps of:

firstly, prefabricating a reinforced concrete floor (1) in a factory, and arranging a prefabricated circular ring (4) at the end of part of reinforcing steel bars at the end part of the reinforced concrete floor;

step two, prefabricating the section steel beam (2) in a factory, arranging vertical pre-welding studs (5) and stiffening ribs (9) on a horizontal flange (6) of the section steel beam, wherein the positions of the vertical pre-welding studs (5) correspond to the reinforced concrete floor (1) at the end part of the reinforced concrete floor (4) one by one; a horizontal pre-welding stud (11) is welded on the inner side of the vertical flange (7);

step three, inverting the prefabricated section steel beam (2), and pouring flange inner side concrete (10) in a factory by taking a vertical flange (7) and a top flange (8) of the prefabricated section steel beam as templates, wherein the horizontal pre-welding studs (11) are used for fixing the flange inner side concrete (10);

fourthly, on-site assembly, namely building the reinforced concrete floor (1) on a horizontal flange (6) of the prefabricated section steel beam (2), and sleeving the steel bar prefabricated circular rings (4) on the reinforced concrete floor (1) on the vertical pre-welded studs (5) in a one-to-one correspondence manner;

and fifthly, taking the horizontal flange (6) and the vertical flange (7) of the prefabricated section steel beam (2) and the side surface of the reinforced concrete floor slab (1) as a template, and pouring concrete (3) in the gap between the prefabricated section steel beam (2) and the reinforced concrete floor slab (1) on site to complete the construction of the beam slab structure.

3. The rapid construction method according to claim 2, wherein the reinforced concrete floor (1) is not limited to a prefabricated reinforced concrete floor, when the floor is a cast-in-place floor of other forms, if scaffolding and formwork erection are allowed on site, the steel reinforcement prefabricated rings (4) at the end parts of the floor are sleeved on the vertical prewelded studs (5) in a one-to-one correspondence manner after formwork erection and then concrete is poured on site; if no scaffold is built on site, the steel plate concrete composite floor slab is used, namely, the steel plate or profiled steel plate end part is welded with the steel bar prefabricated ring (4) in advance in a factory, the steel bar prefabricated ring (4) at the steel plate end part is sleeved on the vertical pre-welded stud (5) of the prefabricated section steel beam (2) during on-site assembly, and then the steel plate is used as a template for casting concrete on site.

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