CN207633734U - A kind of high-altitude overhanging main truss posture steel mould base operation platform - Google Patents

Abstract

The utility model relates to a high-altitude cantilevered main truss type steel formwork construction platform, which belongs to the technical field of construction engineering. The platform formwork includes a main truss, a secondary truss, edge maintenance rods, splicing plates and high-strength bolts. Compared with the prior art, the platform has simple installation method, wide application range, high safety reserve, small deformation, less steel consumption and low overall cost. During the construction process, the main truss transfers most of the load on the platform to the concrete columns through the corresponding joint construction measures, and the secondary truss transfers a small part of the load to the concrete beams through the corresponding joint construction measures. The platform relies on the lower two-story concrete structure to support it, and bears various loads transmitted from the construction platform, making the supporting structure stronger and less deformed. It is suitable for the construction of high-altitude cantilevered construction platforms.

Description

A high-altitude suspended main truss type steel formwork construction platform

technical field

The invention belongs to the technical field of construction engineering and relates to a high-altitude suspended main truss type steel formwork construction platform.

Background technique

In recent years, with the development of my country's economy, there are more and more high-rise and super high-rise buildings, and the architectural shapes are also changing with each passing day. Many high-rise and ultra-high-rise buildings have been designed with high-altitude overhanging cast-in-place concrete structures in order to highlight the building's facade shape and expand the upper use space. The construction process puts forward higher requirements.

The high-altitude cantilevered structure is subject to a large load, which requires high bearing capacity, stiffness and stability of the formwork support platform during construction. In addition, it is a high-altitude operation, which requires that the entire formwork support platform has absolute safety and reliability during the construction process. The traditional construction methods of this type of project are roughly divided into the following two types: (1) Set up the floor-to-ceiling high-altitude full hall support, that is, after the basement roof is reinforced, set up the full hall fastener type steel pipe formwork support frame to the height required for construction. For projects with high cantilevered structures, this method requires a large amount of materials, complex construction and disassembly, and difficult to ensure stability, so it is not suitable for high-altitude cantilevered structures. (2) A cantilevered support system consisting of cantilevered steel beams and diagonal braces. Although this method is greatly improved compared with the previous method, it is only suitable for structures with small overhangs, and it is also not suitable for structures with long overhangs and large self-weight.

Based on this, the present invention proposes a high-altitude cantilever main truss type steel formwork construction platform, which has high bearing capacity, high rigidity, convenient installation and disassembly, wide application range, high safety reserve, less steel consumption, and low overall cost It is especially suitable for high-rise buildings with high-altitude overhanging structures at the corners.

Contents of the invention

The invention provides a high-altitude cantilever main truss type steel formwork construction platform to solve the problem of erecting a long cantilever cast-in-situ concrete structure construction platform in high-rise and super high-rise buildings.

In order to achieve the above object, the present invention adopts the following technical scheme: a high-altitude cantilevered main truss type steel formwork construction platform, the platform includes: main truss (1), secondary truss (2), edge maintenance rods (3), splice plate (4) and high-strength bolt (5).

The main truss described above is a main truss with two intersecting trusses, and the material is H-shaped steel with a strength of Q345, which is welded or rolled, and the cross-sectional size should be calculated and determined by technical personnel according to needs. Each truss includes upper chords, lower chords, vertical webs and diagonal webs. The height of the truss is the story height of the high-rise concrete structure in construction. The angle between the chords, diagonal webs and adjacent webs is kept at about 45 degrees , so that the truss force is more reasonable. At the same time, in the design of the web members of the main truss, as many web members as possible should be in tension to avoid the stability of the steel structure.

The main truss is the main force-bearing member of the entire formwork system, which not only bears the load of itself and its upper part, but also bears the load transmitted by the surrounding secondary truss, and transmits the load to the concrete structure.

The material of the secondary truss is made of H-shaped steel with a strength of Q345, which is welded or rolled, and the cross-sectional size should be calculated and determined by technical personnel according to needs. Secondary trusses also include top chords, bottom chords, vertical webs and braces. The secondary truss inside the cross main truss is called the well-shaped beam truss, one end of the chord is connected to the main truss, and the other end is connected to the concrete structural beam through corresponding node construction measures. Part of the load on the well-shaped beam truss is transferred to the concrete structural beam, and the other part is transferred to the main truss. The secondary truss outside the cross main truss is connected to the main truss at one end, and the other end is similar to a pure overhang, which transmits the load on it to the main truss.

The edge maintenance bar is made of H-shaped steel, which is welded or rolled, and the cross-sectional size should be determined by technical personnel according to needs and structural requirements. Edge maintenance rods are set on the outermost edge of the entire truss, mainly for connection and maintenance, and usually bear less force. In order to reduce self-weight and save steel, its cross-section is usually smaller than the rods of the main truss and secondary truss.

The splicing plates and high-strength bolts are the connecting members of the entire truss, and the splicing plates are rectangular steel plates, including the splicing plates of the upper and lower flanges and the web splicing plates; the material of the high-strength bolts should be 45# steel or alloy steel, and the strength level should be Class 10.9 or higher, the number, location, diameter and length shall be determined by calculation and construction requirements.

When two cross members are connected, the main force member is usually continuous and the relative secondary member is disconnected. A small part of the secondary member is welded with the main member during factory prefabrication, and the remaining part is connected with the welded part through splice plates and high-strength bolts during hoisting.

Compared with the prior art, the present invention provides a high-altitude cantilevered main truss-type steel formwork construction platform, which is suitable for erecting construction platforms for cast-in-situ concrete structures with overhangs at high-altitude corners, and has the following advantages:

(1) Large bearing capacity and high safety reserve. Through the space steel formwork with the height of the storey, the entire formwork becomes a space stress system instead of a single rod, which greatly improves the bearing capacity of the construction support platform.

(2) High rigidity and small deformation. During the stress process of the entire formwork system, the rods are connected with each other and deformed in coordination. In addition, there are many space vertical webs and oblique webs. Compared with individual rods, the strength of the entire construction support platform is greatly improved. Rigidity, thereby reducing its deformation to a minimum, thereby ensuring the accuracy requirements of construction to the greatest extent.

(3) Easy installation and disassembly. The entire truss is prefabricated in the factory and assembled on site, and the connection method of high-strength bolts is used between the truss rods to avoid high-altitude wet operation and ensure the connection quality.

Description of drawings

Fig. 1 is a three-dimensional rendering of a main truss-type steel formwork construction platform cantilevered high above the ground.

Fig. 2 is an elevation view of the main truss in a high-altitude suspended main truss type steel formwork construction platform.

Fig. 3 is a three-dimensional view of the assembling joints of the two bars of the truss in a high-altitude cantilevered main truss type steel formwork construction platform.

Detailed ways

The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

In this example, the cross-sectional size of all rods, the size of the splice plate, and the type of high-strength bolts need to be determined by technical personnel through calculation and structural requirements based on actual engineering. In addition, during the design and installation process, ensure that the upper surface of the upper chord of the platform truss is at the same level, which is conducive to the later construction.

As shown in Figure 1-3, a high-altitude suspension main truss type steel formwork construction platform, the construction method is as follows:

In the first step, when the concrete structure is constructed to the corresponding floor, one of the main trusses is hoisted to the required height, and connected to the concrete column through corresponding node connection measures. For example, if the high-altitude large overhanging concrete structure to be poured is at the height of the floor slab of the nth floor, then the entire construction platform needs to be built in the entire space of the n-1st floor. That is, the upper chord of the space steel formwork is anchored to the concrete column at the height of the n-1 floor, and the lower chord is anchored to the concrete column at the height of the n-2 floor. The height of the entire formwork is the floor height.

The second step is to hoist another main truss to the required height in sections, and connect the two main trusses with bolts through splicing plates, high-strength bolts and reserved holes to ensure sufficient connection strength.

In the third step, after the hoisting of the two main trusses is completed, the sub-trusses are hoisted in sections. The secondary truss and the main truss, and the secondary truss and the secondary truss are also connected with high-strength bolts to ensure the connection strength. Some secondary trusses need to be anchored to concrete beams through corresponding joint construction measures.

In the fourth step, after the main and secondary trusses are hoisted, the edge maintenance rods are hoisted to the required height, and are spliced with the main truss or secondary truss by high-strength bolts.

Step 5: After the entire space steel formwork is hoisted, use an instrument to check whether the installation accuracy meets the requirements, and then spread I-beams or steel plates on the upper chord of the truss to find a complete plane as the bottom surface of the entire construction platform .

Claims (6)

1. a kind of high-altitude overhanging main truss posture steel mould base operation platform, it is characterised in that：The platform includes main couple (1), secondary purlin Rod piece (3), splice plate (4) and high-strength bolt (5) are safeguarded in frame (2), edge；Main couple (1) by being connected with concrete structure column, Jack truss (2) is connected by joint structure measure with concrete structured beam；Bar is safeguarded at main couple (1), jack truss (2) and edge It is connected by splice plate (4) and high-strength bolt (5) between each rod piece in part (3), to which each section is spliced into an entirety Space steel mould base forms space-load system；The overhanging direction of main couple (1) should respectively with the concrete knot of its anchor connection The length direction of the structure column back rest is consistent.

2. a kind of high-altitude overhanging main truss posture steel mould base operation platform according to claim 1, it is characterised in that：Described Main couple (1) is the main couple that two Pin intersect, and material selection intensity is the H profile steel of Q345, welds or rolls；The purlins every Pin Frame includes top boom, lower boom, perpendicular web member and diagonal web member, and truss depth is the floor height of concrete structure on the middle and senior level of constructing, chord member Angle is maintained at 45 degree between diagonal web member and adjacent web members；The main couple that two Pin intersect passes through splice plate (4) and high-strength spiral shell Bolt (5) connects.

3. a kind of high-altitude overhanging main truss posture steel mould base operation platform according to claim 1, it is characterised in that：Described The material selection intensity of jack truss (2) is the H profile steel of Q345, welds or rolls；Jack truss (2) includes top boom, lower edge Bar, perpendicular web member and diagonal brace；Be known as cross beam truss in the jack truss intersected inside main couple, chord member one end by splice plate with And high-strength bolt is connected with main couple, the other end is connected with concrete structured beam；Intersecting the jack truss outside main couple, one end It is connected with main couple, the other end is pure overhanging, will pass to main couple by load thereon.

4. a kind of high-altitude overhanging main truss posture steel mould base operation platform according to claim 1, it is characterised in that：Described Edge safeguards that rod piece (3) is H profile steel, welds or rolls；Safeguard that the ragged edge in entire truss is arranged in rod piece (3) in edge Edge is connect with main couple (1) and jack truss (2) by splice plate (4) and high-strength bolt (5).

5. a kind of high-altitude overhanging main truss posture steel mould base operation platform according to claim 1, it is characterised in that：Described Splice plate (4) and high-strength bolt (5) are the connecting elements of entire truss, and splice plate is rectangular steel plates, includes the spelling of upper lower flange Fishplate bar and web splice plate, thickness are no less than the thickness of institute's connecting plate part；High-strength bolt material should be 45# steel or steel alloy, by force Degree rank should be 10.9 grades or higher.

6. a kind of high-altitude overhanging main truss posture steel mould base operation platform according to claim 1, it is characterised in that：It is constructing In after all member erections, the upper surface of top boom should be at same level height；And above completely spread I-steel or Steel plate finds out a complete plane, the bottom surface as entire operation platform.