Scaffolding definition: a structural frame composed of rods or structural units and accessories through reliable connections, which can bear the corresponding load, has safety protection functions, and provides working conditions for building construction.
Characteristics of socket type disc buckle steel pipe scaffolding.
1.Strong bearing capacity and good safety. The load-bearing body is made of Q355B high-strength steel, and the load-bearing is 15-2 times, the load of a single vertical rod is up to 10 tons, the load of the failure test can be 18-19 tons, and the node force transmission is safe and reliable.
2.The erection is simple and fast, and the construction efficiency is high. One person can build quickly with one hammer, saving comprehensive man-hours and labor costs.
3.Long service life. The disc buckle scaffold adopts the surface treatment process of hot-dip galvanizing, and the product is covered by a zinc layer inside and outside, which has good anti-rust ability, and the service life is usually more than 10 years, and there is no problem in 15-20 years of normal use.
4.Accessories are not easy to lose. There are no loose accessories for disc buckle scaffolding, and the smallest bolt is also attached to the snap joint, which is not easy to disassemble.
5.Flexibility is good. Although the vertical, horizontal and oblique rods of the disc buckle scaffold are fixed module rods, the current disc buckle scaffold is equipped with double bracket channel steel, tripod, short casing and other accessories, which can be flexibly erected according to the actual situation of the site and the construction plan.
6.Simple and beautiful. The internal and external hot-dip galvanizing of the disc buckle scaffold has a silver appearance, and the processing accuracy of the rods is higher than that of the traditional scaffolding, and the erection effect is horizontal and vertical, safe and beautiful.
Relevant standards for socket type disc buckle steel pipe scaffolding:
1."Safety Technical Regulations for Socket Type Disc Buckle Steel Pipe Brackets for Building Construction" JGJ 231-2010 (repealed).
2."Safety Technical Standard for Socket Disc Buckle Steel Pipe Scaffolding for Building Construction" JGJ T 231-2021
3."Socket type disc buckle steel pipe support components" JG T 503-2016
4.General Code for Construction Scaffolding, GB 55023-2022
5."Unified Standard for Safety Technology of Building Construction Scaffolding" GB 51210-2016
Second, the main structural accessories of the socket type disc buckle scaffold.
Safety Technical Standard for Socket Type Disc Buckle Steel Pipe Scaffolding for Building Construction "30.1 article.
According to the size of the outer diameter of the pole, it can be divided into standard type (B type) and heavy duty (Z type). The scaffolding structure parts, materials and their manufacturing quality shall comply with the provisions of the current industry standard "Socket Disc Buckle Steel Pipe Support Components" JG T503.
Horizontal rod: the horizontal rod that is welded with buckle joints at both ends, and can be buckled with the connecting disc on the upright rod, and is equipped with a bolt for interlocking with the upright rod disc.
Oblique rod: The two ends are equipped with buckle joints, and the oblique rods that can be buckled with the connecting disc on the upright rod form a triangular stable structure and increase the overall stiffness of the support body. It is divided into horizontal oblique rod and vertical oblique rod. (The vertical inclined rod of the scaffold should not be made of steel pipe fasteners.) ）
Formwork engineering and support system.
Scope of dangerous works:
The erection height is 5m or more, or the erection span is 10m or more, or the total construction load (the design value of the basic combination of load effects, hereinafter referred to as the design value) is 10kn m2 or more, or the concentrated line load (design value) is 15kn m or more, or the height is greater than the horizontal projection width of the support and is relatively independent and has no contact components.
Exceeding the scope of a certain scale of dangerous projects:
The erection height is 8m or more, or the erection span is 18m or more, or the total construction load (design value) is 15kn m2 or more, or the concentrated line load (design value) is 20kn m and above.
Scaffolding works.
Scope of dangerous works:
1) Erection of floor-mounted steel pipe scaffolding projects with a height of 24m and above (including lighting shafts and elevator shaft scaffolding).
2) Cantilevered scaffolding engineering.
3) Unloading platform and operating platform engineering.
4) Special-shaped scaffolding engineering.
Exceeding the scope of a certain scale of dangerous projects:
1) Erection of floor-mounted steel pipe scaffolding projects with a height of 50m and above.
2) Cantilevered scaffolding works with a height of 20m and above for the sectional scaffolding.
Identification of dangerous projects exceeding the load limit and exceeding a certain scale.
1. Calculation method of concentrated line load (design value):
Design value of concentrated line load = standard value of permanent load (self-weight of reinforced concrete + self-weight of formwork timber) Partial coefficient of permanent load 13 + standard value of construction variable load variable load partial factor 15 (According to the "Unified Standard for Reliability Design of Building Structures" GB50068-2018, Article 8.)2.9 permanent action partial coefficients g take 13. The variable action partial coefficient q is taken as 15）。Take a meter length to calculate, reinforced concrete self-weight = cross-sectional area of the beam ( ) 1m 255kn m (The specific gravity of the reinforcement is 15kn m, concrete fetch 24kn m. The self-weight of the formwork timber = beam section formwork (H+H+B)(M) 1m 05kn (The value is 05kn) The design value of the concentrated line load is taken as 20kN, and the cross-sectional area of the beam is b h, according to the following formula.
Concentrated line load = 13×+1.5×b×2.5 20, resulting in b h 051㎡。That is, the cross-sectional area of the beam reaches 0At 51 o'clock, it is already an ultra-dangerous project and needs expert demonstration.
In the same way, the cross-sectional area of the beam can reach 035 is a critical project.
2. Calculation method of total construction load (design value):
The design value of the total construction load = 13 Standard value of permanent load +15 Standard value of variable load for construction (according to the "Unified Standard for Reliability Design of Building Structures" GB50068-2018, Article 8.)2.9 permanent action partial coefficients g take 13. The variable action partial coefficient q is taken as 15) The design value of the total construction load = partial coefficient 13. Permanent load + partial coefficient 15 (construction evenly distributed live load 2.)5kn 1) When calculating the total load, the bulk density of concrete is 24kn m, and the value of reinforcement bulk density is 11kn/m³）
The design value of the total construction load is taken as 15kN, and the plate thickness h is calculated according to the following formula
1.3×（25.1h+0.3）+1.5×2.5 15kN, H=33cm, that is, when the plate thickness reaches 33cm, expert argumentation is required.
The design value of the total construction load is taken according to the value of 10kN, and it is a dangerous project when the plate thickness reaches 18cm.
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