CN104453197B - High Large Cantilever concrete structural steel shape supports platform - Google Patents

Abstract

The invention relates to a high-altitude large cantilever concrete structure steel support platform, which comprises a multi-section steel triangular support bracket, a channel steel horizontal connecting beam and a channel steel horizontal purlin. The multi-section steel triangular support bracket includes a main beam, a horizontal rod, a vertical direction bar, the first diagonal brace and the second diagonal brace; the main girder is installed on the edge beam of the frame structure of the next layer of the cantilever structure to be constructed; the first diagonal brace and the second diagonal brace are respectively installed on On the side beams of the lower two-story frame structure and the lower three-story frame structure of the cantilever structure that needs to be constructed; the horizontal bar connects the first diagonal brace and the second diagonal brace; the joint between the second diagonal brace and the horizontal It is connected with one end of the vertical rod, and the other end of the vertical rod is connected with the main beam; the upper surface of the main beam is welded and laid with a plurality of channel steel horizontal purlins for erecting formwork frames and external scaffolding; among the multi-shaped steel triangular support brackets The rooms are welded and connected by channel steel horizontal connecting beams. The invention solves the problem of construction difficulty of structures with superelevation, large overhangs and large component loads.

Description

High-altitude large cantilever concrete structure steel support platform

technical field

The invention relates to the field of building technology, in particular to a high-altitude large-cantilever concrete structure steel support platform.

Background technique

In order to meet the needs of highlighting the effect of building facade modeling and the expansion of high-rise upper space in architectural design, there have been more and more buildings with high-rise cantilevered concrete structures and components in recent years. The self-weight and wind load of the high-altitude cantilever structure are relatively large, and the stability and rigidity of the formwork support system during construction are required to be high, and the high-altitude operation requires the construction process of the entire support system to be absolutely reliable and safe. The choice of support form and material is very important. For example, the headquarters of Shanghai Yuantong Express Co., Ltd. is located in the west of Huaxu Highway and north of Minxing Avenue in Shanghai. The warehouse management building project has designed a round hall on the south side of the tenth floor. The round hall is on the south side of the tenth floor structure. There is a decorative semi-arc platform with a width of 18.60m and an overhang of 6m, with an elevation of 40.45m. There are two types of cantilever beams: 400×700mm and 700×800mm, the ring beam is 400×700mm, and the plate thickness is 120mm. The cantilever structure has a high construction height, a large cantilever span, and the cantilevered part is decorated with external stone materials, so when considering the support system, it is necessary to take into account the decoration of the external scaffolding.

There are two types of traditional construction methods: (1) floor-to-ceiling steel pipe support system: the current national standard JGJ130-2011 "Safety Technical Regulations for Fastener-type Steel Pipe Scaffolding in Building Construction" stipulates that "the height of the support frame for the whole hall should not exceed 30m" and Shanghai local code DG/T08-16-2011 "Safety Technical Regulations for Steel Tube Fastener Formwork Vertical Support System" stipulates that "the maximum support height between the plane of the bearing support system and the pouring plane member should not be greater than 30m". If you want to build a full hall support frame with a height of more than 30m, due to the high height of the formwork, in order to ensure the overall stability and rigidity, you must increase the distance between the horizontal bar tie and the vertical support, so you need to invest a lot of steel pipe materials, which is not safe. Obviously not economical. (2) Section steel main girder cantilever, diagonal bracing bar unloading support system: Since the main force-bearing component of this support system is the section steel main girder cantilever, it is suitable for the external scaffolding or support frame of the balcony slab with a cantilever length of about 2m. The cantilever length of the cantilever steel is generally about 3.5m. For a cantilever structure over 2m, due to the large structural load, the required cantilever steel section is also large, resulting in a large self-weight, the design of the cantilever structure needs to be reviewed, and a large design adjustment is required. Sectional changes will affect the function of use.

Contents of the invention

The invention provides a high-altitude large cantilever concrete structure steel support platform, which solves the construction difficulty of super-high, large cantilever, and large component load structures, and has the advantages of convenient operation, reasonable force, strong bearing capacity, good stability and safety. economic advantages.

The technical solution adopted by the present invention to solve the technical problem is: provide a high-altitude large cantilevered concrete structure steel support platform, including a plurality of multi-shaped steel triangular support brackets, channel steel horizontal connecting beams and channel steel horizontal purlins, the The multi-section steel triangular support bracket includes a main beam, a horizontal bar, a vertical bar, a first diagonal brace and a second diagonal brace; On the beam; the first diagonal brace and the second diagonal brace are respectively installed on the side beams of the lower two-story frame structure of the cantilever structure that needs to be constructed and on the side beams of the lower three-story frame structure; the horizontal bar Connect the first diagonal brace and the second diagonal brace; the joint between the second diagonal brace and the horizontal rod is also connected to one end of the vertical rod, and the other end of the vertical rod is connected to the main beam; the main beam The upper surface is welded with a plurality of channel steel horizontal purlins for erecting formwork frames and external scaffolding; the plurality of multi-shaped steel triangular support brackets are welded and connected by the channel steel horizontal connecting beams.

The multi-section steel triangular support bracket is welded, the main girder adopts 20a I-beam, the first diagonal brace, the second diagonal brace, horizontal rod and vertical rod all adopt No. 16 I-beam.

The frame structure of the next floor, the frame structure of the second floor and the frame structure of the third floor of the cantilever structure that needs to be constructed are all provided with embedded parts on the side beams, and the embedded parts are respectively used for welding the main beam, the first oblique struts and second diagonal struts.

There are at least four multi-section steel triangular support brackets, and the horizontal distance between any two is 1-1.3m.

The distance between the horizontal purlins of the channel steel is 400mm, and the 50mm thick wooden scaffolding is covered.

Two M20U-shaped bolts are pre-embedded on the side-span floor of the cantilevered part of the installation floor of the main beam.

The support platform is suitable for the construction of a cantilevered structure on a concrete frame structure with a net cantilever length of a horizontal beam not exceeding 8m and a floor height not exceeding 4.5m.

Beneficial effect

Owing to having adopted above-mentioned technical scheme, the present invention has following advantage and positive effect compared with prior art: the present invention is made up of multi-section steel triangular support bracket, channel steel horizontal connecting beam (rod), channel steel horizontal purlin The high-altitude large cantilever concrete structure steel support platform solves the construction difficulty of super high, large cantilever, and large component load structures. It has many advantages such as convenient operation, reasonable force, strong bearing capacity, good stability, safety and economy.

Description of drawings

Fig. 1 is a floor plan of the present invention;

Fig. 2 is a schematic elevation view of the present invention.

detailed description

Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

The embodiment of the present invention relates to a high-altitude large cantilever concrete structure steel support platform, as shown in Figure 1 and Figure 2, including a plurality of multi-shaped steel triangular support brackets 1, channel steel horizontal connecting beams 2 and channel steel horizontal purlins 3. The multi-section steel triangular support bracket 1 includes a main beam 11, a horizontal bar 12, a vertical bar 13, a first diagonal brace 14 and a second diagonal brace 15; the main beam 11 is installed on the On the side beam of the next layer of frame structure of the cantilever structure; the first diagonal brace 14 and the second diagonal brace 15 are respectively installed on and below the side beam of the lower second floor frame structure of the cantilever structure to be constructed On the side beam of the three-layer frame structure; the horizontal bar 12 connects the first diagonal brace 14 and the second diagonal brace 15; One end of the vertical rod 13 is connected to each other, and the other end of the vertical bar 13 is connected to the main beam 11; the upper surface of the main beam 11 is welded and laid with a plurality of channel steel horizontal purlins 3 for setting up formwork frames and external scaffolding; The multi-shaped steel triangular support brackets 1 are welded and connected by the channel steel horizontal connecting beam 2.

Among them, the triangular support bracket 1 is welded by section steel, the main beam 11 adopts 20a I-beam, the longest cantilever section is 7.6m, the first diagonal brace 14, the second diagonal brace 15, the horizontal rod 12 and the vertical Bar 13 all adopts No. 16 I-beams.

The main girder of the multi-section steel triangular support bracket 1 is installed on the side beam of the frame structure of the next floor of the cantilever structure that needs to be constructed. The first I-steel diagonal brace 14 is installed on the side beam of the frame structure of the second floor. The I-beam diagonal braces 15 are installed on the side beams of the lower three-story frame structure, and the three nodes are respectively welded with the embedded parts 4 on the third-floor floor, and the weld seam height is 6mm. The embedded part 4 at the top of the side beam can be a pre-embedded steel plate, which is welded with 20mm thick steel plate and 6 steel bars with a diameter of 14mm and a length of 400mm, and is embedded in the top of the structural side beam during structural construction.

There are also two M20U-shaped bolts 5 pre-embedded on the side-span floor where the main beam 11 is installed on the floor, which is used to temporarily fix the 20a I-beam main beam when the triangular support bracket is installed, and is used for safety storage.

The horizontal spacing of multi-section steel triangular support brackets 1 is 1m, and the maximum is no more than 1.3m. The support brackets 1 are connected by welding with 14a channel steel horizontal connecting beams 2.

14a channel steel horizontal purlins 3 are welded and laid on the main girder 11 of the multi-section steel triangular support bracket 1 to set up the formwork frame and external scaffolding, the distance between the channel steel horizontal purlins 3 is 400mm, and the channel steel horizontal purlins 3 There are 50mm thick wooden scaffolding boards all over the floor, creating a platform for the formwork frame.

It is worth mentioning that the plan of the steel support platform requires the structural designer to check and calculate the structural force of the side beams at the cantilevered parts of the lower three floors of the cantilevered structure to be constructed. The steel support platform is suitable for various forms of cantilevered structures on the concrete frame structure where the net cantilever length of the horizontal beam does not exceed 8m and the height of the floor does not exceed 4.5m (that is, the floor height of each floor is less than or equal to 4.5m). construction.

The installation and disassembly of the present invention are very convenient, and the installation steps and disassembly steps of the present invention will be described respectively below.

installation steps:

(1) Divide the section steel supporting platform into several parts such as single triangular bracket, channel steel horizontal connecting beam (rod), channel steel horizontal purlin;

(2) Factory-manufacture the single triangular bracket on the ground to ensure the quality of production;

(3) Hoist the single triangular bracket with a tower crane to the high-altitude operation point for installation and fixation.

(4) Channel steel horizontal connecting beams (rods) and channel steel horizontal purlins are welded and installed in the air to complete the installation of the steel support platform.

Disassembly steps:

(1) Reserve a Φ20mm suspension ring during the construction of the cantilevered floor structure;

(2) When dismantling, first hang the bracket on the ring with a wire rope;

(3) Cut the bracket away from the fulcrum;

(4) Lift the bracket from the outside of the bracket with a tower crane, and gradually loosen the suspended wire rope;

(5) Use a tower crane to drag the bracket away from the bottom of the cantilevered slab and hoist it to the ground.

It is not difficult to find that the present invention forms a high-altitude large cantilever concrete structural steel support platform through multi-shaped steel triangular support brackets, channel steel horizontal connecting beams (rods), and channel steel horizontal purlins, which solves the problem of super high, large cantilever, and component loads. The construction difficulty of larger structures has many advantages such as convenient operation, reasonable force, strong bearing capacity, good stability, safety and economy.

Claims (7)

1. A high-altitude large cantilever concrete structure steel support platform, including a plurality of multi-shaped steel triangular support brackets (1), channel steel horizontal connecting beams (2) and channel steel horizontal purlins (3), main beams (11) The upper surface is welded and laid with a plurality of channel steel horizontal purlins (3) for setting up formwork frames and external scaffolding, and it is characterized in that the multi-shaped steel triangular support bracket (1) includes a main beam (11), Horizontal bar (12), vertical bar (13), first diagonal brace (14) and second diagonal brace (15); described main beam (11) is installed in the next floor of the cantilevered structure that needs construction On the side beam of the frame structure; the first diagonal brace (14) and the second diagonal brace (15) are respectively installed on the side beam and the lower three-story frame of the lower two-story frame structure of the cantilever structure that needs to be constructed On the side beam of the structure; the horizontal rod (12) connects the first diagonal brace (14) and the second diagonal brace (15); the node of the second diagonal brace (15) and the horizontal rod (12) The place is also connected with one end of the vertical bar (13), and the other end of the vertical bar (13) is connected with the main beam (11); the grooves are passed between the plurality of multi-shaped steel triangular support brackets (1) The steel horizontal connecting beam (2) is welded and connected. 2. The high-altitude large cantilever concrete structure steel support platform according to claim 1, characterized in that, the multi-shaped steel triangular support bracket (1) is welded, and the main beam (11) adopts 20a I-beam, The first diagonal brace (14), the second diagonal brace (15), the horizontal rod (12) and the vertical rod (13) all adopt No. 16 I-beams. 3. The high-altitude large cantilever concrete structure steel support platform according to claim 1, characterized in that, the frame structure of the next floor, the frame structure of the second floor and the frame structure of the next three floors of the cantilever structure that needs to be constructed Embedded parts (4) are provided on the side beams, and the embedded parts (4) are respectively used for welding the main beam (11), the first diagonal brace (14) and the second diagonal brace (15). 4. The high-altitude large cantilever concrete structure steel support platform according to claim 1, characterized in that there are at least four multi-shaped steel triangular support brackets (1), and the horizontal distance between any two is 1- 1.3m. 5. The high-altitude large cantilever concrete structure steel support platform according to claim 1, characterized in that the distance between the channel steel horizontal purlins (3) is 400mm, and the 50mm thick wooden scaffolding is covered. 6. The high-altitude large cantilever concrete structure steel support platform according to claim 1, characterized in that two M20U-shaped bolts are pre-embedded on the side-span floor with cantilevered parts on the installation floor of the main beam (11) (5). 7. The high-altitude large cantilever concrete structure steel support platform according to claim 1, characterized in that, the support platform is suitable for a concrete frame with a net cantilever length of a horizontal beam not exceeding 8m and a floor height of not exceeding 4.5m Structural cantilever construction.