Compared with the fastener type steel pipe, the material strength is greatly improved.
The total building area is 388188.30 ㎡.
For example, under the condition of 250 mm and below plate thickness, the spacing of the pole can be set to 1200 by using square steel × 1200, and if steel pipe is used, the distance between upright poles must be set to 1200 × 900。 This gap will greatly increase the rate of scaffolding by labor workers, and save a lot of turnover materials.
The main construction materials include coiled steel pipe, wood brace, plywood, square steel, steel pipe, etc.
Design of the support system The basement structural plates of the project are 100mm, 200mm, 250mm, 350mm and 400mm thick, and the floor heights are approximately 4.3m, 6m and 6m.
The materials in the later construction area shall be reasonably disassembled and transferred from the materials in the first construction area, and the materials of the above ground structure shall be reasonably disassembled and transferred from the basement materials.
There is no area with a floor height of more than 8m, and there are few overweight beams.
For the same plate thickness, when square steel and steel pipe are used as the main ridge at the bottom of the plate, the spacing of the plate chassis buckle pole will also be different.
The coiled steel pipe is a tool type key sheath type steel pipe.
In this study, through the difference analysis on the calculation, the double steel pipes of the main ridge at the bottom of the plate are completely replaced by the double steel pipes of the two sides, which greatly shortens the erection and removal time of the support system, improves the construction efficiency, improves the quality of safe and civilized construction, speeds up the construction period and saves a lot of turnover material rental costs.
4.
The combined support system of coil type steel pipe support and square steel is adopted for the formwork support of the Project.
Erection and dismantling of the turnbuckle support system 5.
According to the characteristics of the coil type steel pipe support frame, the method of setting double side steel or double steel pipes at the top of the pole is adopted.
This article mainly aims at the characteristics of high strength and high rigidity of the coil frame, and compares the main keel of the traditional support system in the housing construction project, which is formed by replacing steel pipes with square steel to form a combined support system of the coil frame and square steel.
2.
The basement is of frame structure.
The specification of vertical pole is Φ 48.3 * 3.2mm, according to the market supply situation and the calculation of the formwork support height, the coil tie upright with the specification of 2.0m and below is adopted.
Innovation and progressiveness of the achievements: the socket type buckle support system is now being used more and more in the housing construction industry, but basically, the support system composed of socket type buckle support and steel pipe is used, or in some special structures, square steel or even I-steel with higher strength is used.
It is located in the west of Shahe Street, Shahe Street, Nanshan District, Shenzhen City, and the east of Shahe East Road.
Calculation basis According to JGJ231-2010 Safety Technical Specification for Steel Pipe Supports with Socket type Disc Fasteners in Building Construction, the diagonal rods or diagonal braces of the formwork support are arranged as follows: 7.
8.
The red line covers the area with plate thickness ≤ 280mm, and the green line covers the area with plate thickness>300mm.
With the development of the construction industry, the disc buckle support has been more and more used in housing construction projects due to its excellent performance.
This research is mainly carried out for the comparison of slab bottom support systems.
The coiled vertical rod is made of Q345B.
Source: Southern Xinjiang Dream Building: He Jie welcomes your attention..
Preface In recent years, socket and spigot type disc buckle steel pipe support has been widely used in municipal engineering.
The secondary keel at the bottom of the plate is 40 × 90mm wood brace, spacing of 250mm, main keel of 50 × fifty × 3mm double side steel or Φ 48.3 * 3.0mm double steel pipe.
By comparison, it is calculated that the use of two-way steel as the main beam of the plate bottom is compared with the use of double steel pipes as the main beam of the plate bottom, which will save the amount of vertical rods The crossbar and jacking are 237.4t in total.
Construction optimization of the combined support system of socket and spigot type disc buckle support and square steel 1.
As shown in the above table, when the plate thickness is ≤ 280mm, the distance between upright poles can be set to 1200 with two-way steel × 1200mm, if double steel pipes are used, the spacing of vertical poles must be set as 900 × 1200mm； When the plate thickness is>300mm, the distance between upright poles can be set to 900 by using two-way steel × 900mm, if double steel pipes are used, the spacing of vertical poles must be set as 600 × 900mm。 At the same time, in most cases, the construction personnel will × 1200mm full framing is 900 × 900mm。 In this way, the use of double steel pipes will save a lot of turnover materials and greatly accelerate the construction progress.
The basement structure shall be handed over in different areas, and the construction shall be carried out in different areas.
On the premise of ensuring the safety and economic applicability of the support, it greatly reduces the number of upright rods and diagonal rods of the frame, further develops the superior performance of the coil frame, saves labor, time and cost, and improves the construction efficiency, It provides reference for similar projects in the future.
Project overview Shenye Century Valley Garden Project is a residential project invested and developed by Shenye Group and built by China Construction Third Engineering Bureau.
Take the basement construction of Shenye Century Valley Project as an example to calculate the material saving.
Support system materials The support system of this project adopts socket type disc buckle support and square steel combined support system.
Comparison of calculation parameters and model selection is shown in the figure above.
6.
The reasonable construction flow arrangement can greatly reduce the cost of revolving materials of the project.
As the weight of square steel per meter is heavier than that of steel pipe, the amount of square steel will be increased.
It is assumed that the entire basement is fully filled with turnover materials.
This study mainly focuses on different plate thicknesses.
3.
The formwork is made of 15mm thick ordinary plywood.
From the comparison calculation results, it can be seen that the use of two-way steel as the main ridge at the bottom of the plate will not only greatly accelerate the on-site progress, but also save a large amount of revolving material costs.
