Techniques and details of high-altitude bulk loading of space frame roof structures

The space frame roof structure installation adopts high-altitude bulk, so it is necessary to set up an installation platform. In order to improve the construction progress, a scaffolding platform is adopted. The platform surface should be between 0.3 and 0.8m from the bottom chord of the space frame, and the space frame steel bar should be placed on the ground according to the construction sequence, and hoisted to the installation platform in sequence. Each lifting should not exceed 0.5 tons, and the lifting equipment should be hydraulic crane on site. After the components are lifted to the platform, they should be placed according to the installation position immediately to prevent the components from being stacked together. Before the installation of the grid, Before installation of each space frame,in addition to the careful inspection of the steel bar and bolt balls during production, the number check of the steel bar and the bolt balls and the inspection of the external dimensions should be carried out to match the positive and negative deviations of the steel bar and bolt balls.

Generally speaking, there are two main ways to install the space frame roof structure, one is the direct splicing of steel bar, and the other is a small unit installation. During the installation process, the above two methods can be combined and constructed at the same time, and the high-strength bolts must be in place when tightening. The multi-pass tightening method is adopted. After the bolts are tightened, the set screws are tightened. Finally, all the joints and the redundant bolt holes on the node ball are filled tightly with an oil brush, and two coats of anti-rust paint are applied.

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How to Control the Installation Deviation of the Bolt Ball Space frame

        There are generally deviations in the installation of the bolt ball space frame. How to reasonably control deviations during installation and avoid deviation accumulation? SAFS steel structure Engineering Company has organized three ways for your reference:

1. The embedded parts should be leveled and the axis of the spring should be leveled to ensure that the rubber bearings meet the installation requirements under the design standards. Properly dispose of embedded parts that do not meet the conditions.

2.  Prevent the overall space frame from settling before forming. Give enough grid support points on the actual operating platform.

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3. After each unit or multiple units are installed, the grid must be checked and recorded step by step to prevent deviations in the processing and production process from accumulating during installation. If it is found that the deviation accumulation is too large in the whole process of the installation, which affects the subsequent installation, it is necessary to stop the installation, analyze the reasons, and make rectifications in time.

For large-span space frames, when installing a single-span, the bolts cannot be tightened at one time, so as to adjust the deviation of the rubber bearing caused by the accumulation of deviations or the insufficient support of the scaffolding platform in the later stage. Adjusting the height of the platform support can be adjusted with a jack, but the strength and stability of the scaffolding must be ensured.

The design and material of the steel structure carport must have corresponding requirements

 If we want the large steel structure carport we build ourselves to be of good quality, then we must have corresponding specifications in the design and selection of materials. How to do it? Here are five points to share with you.

First of all, when we design, we must consider the toughness of the SAFS steel structure carport. When designing, we cannot because the plasticity of the steel is better and ignore the effect of force, so that after the construction is completed, there is only aesthetics.

Second, after the construction is completed, we must also regularly repair it, especially with the increase of use time, there will be some problems on the surface of the steel structure carport, we must repair it as soon as possible.

Third, when we choose steel, we must choose good toughness, so that when we use it, we can reduce the cracking situation.

Fourth, when we are processing, we must choose the appropriate processing technology according to the state of the steel, otherwise it will have a great impact on the strength and toughness of the steel structure carport.

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Fifth, the material used in the steel structure carport must have good durability, so that it can have a good life when it is used. Otherwise, we need to replace or repair it regularly when we use it.

Precautions of space frame construction in rainy period

In the rainy period, the construction of the space frame structure project must be considered carefully, pay attention to the influence of various factors, and make the correct treatment method according to the actual situation.

1. For the earthwork piled up on the construction site, measures should be taken to prevent rain erosion around the site. For example, put strip stones around to prevent the earthwork from being washed into the excavated foundation groove or pipe trench by rainwater. Or bury some infrastructure that has already been completed. After the foundation construction is completed, the backfilling work around the foundation pit should be carried out as soon as possible. When artificial precipitation is stopped, the anti-floating stability of the box-shaped foundation and the buoyancy of groundwater on the foundation should be checked, and the anti-floating stability coefficient should not be less than 1.2. Stop construction when the impact of rain is great. What is being excavated is mainly supported by slowing down edge breaking.

2. The working surface of the space frame during the rainy season should not be too large, and should be completed segment by segment and segment by segment; when the rainfall is heavy, the earthwork construction should be stopped in a large area; For the foundation soaked by rainwater, necessary work such as excavation and backfilling should be done to restore the bearing capacity of the foundation; important or special projects should be completed before the rainy season.

3. To prevent the slope from being washed away by rainwater, nail wire mesh can be added to the slope, and 50cm of fine stone concrete can be applied; the slope can also be covered with plastic sheets;

4. In order to prevent the foundation pit from being soaked, drainage ditch and water collecting well should be made in the foundation pit and necessary drainage force should be organized during excavation; the pool and basement located at the bottom should be carefully considered during construction. If the pre-consideration is not careful, after pouring and pounding, in the event of heavy rain, it will often cause the basement and pond to float up. ​​

5. When excavating foundation trenches or pipe trenches in rainy period, attention should be paid to the stability of the slope. If necessary, slow down the side slope or set up supports. The inspection and control of side slopes and supports shall be strengthened during the construction of space frame engineering; supports shall be provided for excavated foundation trenches or pipe trenches. ​​

6. The earthwork backfilled before the rain should be rolled in time to form a certain slope on the surface, so that the rainwater can be automatically discharged.

To sum up, in the construction of space frame structure, we must pay attention to the influence of the unique influencing factors in the rainy period, so as to solve unique problems in the rainy period, and strengthen the safety and stability of the space frame structure.

Space frame industry knowledge: https://www.safsteelstructure.com/news-center/