How to calculate the protective force of scaffolding

The calculation of steel pipe scaffolding refers to the "Safety Technical Code for Fastener-type Steel Pipe Scaffolding in Building Construction" (JGJ130-2001). There are eight aspects that need to be calculated:

1. Calculation of small crossbar: The strength and deflection of the small crossbar are calculated according to the simply supported beam, and the small crossbar is on top of the large crossbar. The maximum bending moment and deformation of the small crossbar are calculated according to the scaffold board and the live load on the small crossbar as the uniform load.

The calculated data includes the following three values:

1.Calculation of uniform load values

2.Calculation of flexural strength: The maximum bending moment is considered as the bending moment under the uniform load of the simply supported beam.

3.Deflection calculation: The maximum deflection is considered to be the deflection under the uniform load of the simply supported beam.

2. Calculation of large crossbar: The strength and deflection of the large crossbar are calculated according to the three-span continuous beam, and the small crossbar is on top of the large crossbar. The maximum reaction force of the small crossbar support is calculated, and the maximum bending moment and deformation of the large crossbar are calculated under the most unfavorable load arrangement.

1.Calculation of load values.

2.Flexural strength calculation: The maximum bending moment is considered as the sum of the bending moment of the unfavorable distribution of the self-weight uniform load of the large crossbar and the calculated value of the load.

3.Deflection calculation: The maximum deflection is considered to be the deflection of the most unfavorable distribution of the self-weight uniform load of the large crossbar and the calculated value of the load.

3. Calculation of anti-slip force of fasteners.

When the longitudinal or transverse horizontal rod is connected with the vertical rod, the anti-slip bearing capacity of the fastener is calculated according to the following formula (specification: r rc where rc - the design value of the anti-slip bearing capacity of the fastener, take; r – the design value of the vertical force transmitted by the longitudinal or transverse horizontal rod to the upright rod.

1) The standard value of the structural self-weight of the upright rod per meter (kn m);

2) the standard value of the self-weight of the scaffold board (kn m2);

3) standard value of self-weight of railing and scaffold board (kn m);

4) Suspended safety facility loads, including safety nets (kn m2);

5. Calculation of the stability of the pole:

Calculation of the stability of the upright rod without considering the wind load.

Calculation of the stability of the upright rod when considering the wind load.

6. Calculation of the maximum erection height.

7. Calculation of wall pieces.

8. Calculation of the bearing capacity of the foundation of the pole.

The calculation is relatively high, and the probability is more cost-effective.

Scaffolding foundation bearing capacity calculation take an outer frame unit (9 step frame, longitudinal distance analysis meter calculation 1, static load: (1), steel pipe self-weight vertical rod: horizontal rod:

10* Joist: 10* Small transverse cylinder: 10* Steel pipe weight:

2), fastener weight: (3), bamboo fence weight: bottom fence:

7 sheets * 12kg = 84kg static load: 462 + 72 + 84 = 618kg 2, construction load According to the requirements of the regulations, the construction load of structural scaffolding shall not exceed 270kg, and the decorative scaffold shall not exceed 200kg, then the construction load is: 270 * 3, wind and snow load can not be considered when calculating, and strengthening measures should be taken in the framework of the scaffolding.

4. The design value of the load n=k*q= n--- axial pressure of the upright rod on the foundation k--- the factors such as safety nets, picks, shear braces, diagonal braces and other factors that have not been calculated, take the coefficient q--- the total weight of static load and live load 5. Calculation of axial compressive strength of steel pipe lower foundation f1=n a=(compressive strength of fir wood) F1--- axial compressive stress of the upright rod on the plank foundation (n mm2) a--- The total contact area of the upright rod on the plank foundation (mm2) Axial compressive strength of fck planks (n mm2) Meet the strength requirements Second, the calculation of the tensile rod of the connecting wall Take the diameter of the tensile rod round steel for calculation 1, the tensile strength check f ( 710kg 700kg in line with the provisions of the tensile bracing force of the high-rise outer frame, and meet the engineering requirements. 

The code stipulates that when there are two or more operating layers operating on the double-row scaffolding at the same time, the sum of the standard values of the construction uniform load of each operating layer in the same span shall not exceed.

Answer: The force of the steel pipe can only be called compressive bearing capacity, not compressive strength. The basic value is: the compressive strength of the steel multiplied by the cross-sectional area of the steel pipe, on this basis, the overall stability coefficient of the compressive member should be considered.

This coefficient is calculated from the slenderness ratio of the compressed member. The slenderness ratio is the calculated length of the compressive member divided by the radius of rotation of the cross-section.

If it is a standard size cross-section, you can check the value of the swing radius in the manual, otherwise you have to calculate it yourself. According to past experience, it is more economical to control the slenderness ratio at 40 to 60.

Dear, I hope my answer will be helpful to you, and I wish you a happy life!

1. Calculation basis (1) "Safety Technical Code for Fastener-type Steel Pipe Scaffolding for Building Construction" (JGJ130-2001) (2) "Code for Building Structure Load" (GB50009-2001) (3) Bay Longines engineering design drawings and geological data, etc. 2. Calculation parameters of scaffolding Erection height h=m (take the maximum height, 22 rows), step h=m, vertical rod longitudinal distance la=m, vertical pole transverse distance lb=m, connecting wall pieces for 2 steps and 3 spans, scaffolding board for bamboo pieces, Calculated according to the simultaneous laying of 7 rows, the number of working layers at the same time n1 = 1. The scaffolding material is made of 48 steel pipes, with a cross-sectional area of a=489mm2, a cross-sectional modulus w= mm3, a radius of rotation i=, a design value of compressive and bending strength f=205n mm2, a basic wind pressure value of 0= kn m2, and the snow load is ignored in the calculation. 3. The standard value of the load The standard value of the self-weight of the structure:

gk1= (double-row scaffolding) standard value of self-weight of bamboo scaffolding: gk2= (can be taken according to the actual value) construction uniform distribution live load: qk=3 kn m2 wind load standard value:

k= where z - wind pressure height change coefficient, check the "building structure load code" and use the insertion method to get the meter as s - scaffold wind load carrier type coefficient, fully enclosed is 0 - basic wind pressure value, is kn m2 then k= kn m2 4, longitudinal horizontal rod, transverse horizontal rod calculation transverse horizontal rod calculation scaffolding erection section is as follows: According to the calculation of simply supported beams, the calculation diagram is as follows: The self-weight of each longitudinal scaffold piece ng2k=gk2 la lb= kn per longitudinal construction load nqk=qk la lb =3 kn mgk= kn m mqk= kn m m= kn m m[v]=lb 150=1100 150= mm v<[v] The deflection of the transverse horizontal rod meets the requirements. Longitudinal horizontal rod calculation According to the calculation of three-span continuous beam, the simplified diagram is as follows: The self-weight uniform load of the scaffold piece g2k=gk2 lb 3= kn m construction uniform load qk=qk lb 3=3 kn m q= kn m mgk max= kn m mqk max= kn m m m= max+ max= kn m [v]=lb 150=1500 150=10 mm v [v] The deflection meets the requirements. Calculation of the anti-slip bearing capacity of the fastener connected by the transverse horizontal rod and the upright rod The vertical force transmitted by the transverse horizontal rod to the upright rod: r=( kn rc= kn r rc The anti-slip bearing capacity of the fastener meets the requirements.

Hehe, the calculation is a bit cumbersome! Take it easy!

The permissible load of structural scaffolding is 3kn (for decoration.

The weight of the scaffolding steel pipeline is.

The calculation formula is: the allowable load of hunger and use (3kn orange section) 6m scaffold working surface width (according to the actual situation) 1000 scaffold steel pipeline weight (.

1. All 1, calculation basis.

1) "Safety Technical Code for Fastener-type Steel Pipe Scaffolding for Building Construction" (JGJ130-2001).

2) "Code for Loading of Building Structures" (GB50009-2001) (3) Bay Longines engineering design drawings and geological data, etc.

2. Calculation parameters of scaffolding.

Erection height h = m (take the maximum height, 22 rows), step distance h = m, vertical pole longitudinal distance la = m, vertical pole horizontal distance lb = m, connecting wall pieces for 2 steps and 3 spans setting, scaffold board for bamboo pieces, calculated according to the simultaneous laying of 7 rows, and the number of working layers at the same time n1 = 1.

The scaffolding material is made of 48 steel pipes, with a cross-sectional area of a=489mm2, a cross-sectional modulus w= mm3, a radius of rotation i=, a design value of compressive and bending strength f=205n mm2, a basic wind pressure value of 0= kn m2, and the snow load is ignored in the calculation.

3. Standard value of load.

Standard value of self-weight of structure: gk1= (double-row scaffolding) standard value of self-weight of bamboo scaffolding: gk2= (can be taken according to the actual value) construction uniform live load: qk=3 kn m2

Wind load standard value: k=

where z - the coefficient of change of wind pressure height, check the "Code for Load of Building Structure".

And use the insertion method to get the meter.

s - scaffold wind load carrier type coefficient, fully enclosed.

0 – the basic wind pressure value, which is kn m2

Then k= kn m2

4. Calculation of longitudinal horizontal rod and transverse horizontal rod.

Calculation of the transverse horizontal bar.

The scaffolding erection section is as follows:

According to the calculation of the simply supported beam, the calculation diagram is as follows:

The self-weight of each longitudinal scaffold piece is NG2K=GK2 La LB = KN=KN per longitudinal construction loadNQK=QK La LB =3 KNMngMK= KNM

mqk= knm

m= knm

The bending strength of the transverse horizontal rod meets the requirements.

v]=lb 150=1100 150= mmv<[v] The deflection of the transverse horizontal rod meets the requirements.

Longitudinal horizontal bar calculation.

Calculated according to the three-span continuous beam, the simplified diagram is as follows:

Scaffolding piece self-weight uniform load g2k=gk2 lb 3= kn mConstruction uniform load qk=qk lb 3=3 kn mq= kn m

mgk max= knm

mqk max= knm

m= max+ max= knm

The flexural strength meets the requirements.

v]=lb 150=1500 150=10 mmv [v] The deflection meets the requirements.

Design of anti-slip bearing capacity of fasteners connected by transverse horizontal rods and upright rods.

The vertical force transmitted by the transverse horizontal rod to the upright rod:

r=( kn

rc= kn

The anti-slip bearing capacity of the R RC fastener meets the requirements.

Scaffolding calculation book 1, scaffolding related mechanical calculation conditions according to the eaves height and the needs of construction, the height of the erection of scaffolding is h = taking into account the local height of the roof so it is calculated according to 80m), the horizontal distance of the vertical rod lb = the longitudinal distance of the vertical rod l =, the large cross bar step distance h =, the transverse horizontal rod against the wall side of the extension length of 300mm, paved with 5cm thick wooden scaffold board 4 layers, at the same time construction 2 layers, the construction load according to the structure construction take qk = 4kn m2, (the load consideration of two layers at the same time during decoration, Every two meters is calculated according to the operation of one person, a 300mm high diameter 500mm ash hopper is placed on the side of the person, and two boxes of exterior wall bricks are discharged on the scaffold board of the frame body), and the wall rod is arranged as two steps and three spans (2h 3L), the steel pipe is 48, the basic wind pressure is w0, and the dense mesh vertical net is fully enclosed, and the overall stability of the scaffold is calculated. For other calculation parameters, check the "Safety Technical Specifications for Fastener-type Steel Pipe Scaffolding in Building Construction" and the "Construction Calculation Manual": the cross-sectional area of the vertical rod is a = 489mm2 (due to the use of old steel pipes, taking into account the wear, the wall thickness of the steel pipe is calculated, the cross-sectional area is a = 458mm2), the radius of rotation of the steel pipe is i =, the cross-sectional modulus w = , the design value of the compressive strength of the steel is f 205n mm2, the weight of the scaffold steel pipe is the weight of the fastener, the self-weight of the wooden scaffold board, and the dense mesh (density is 2300 mesh 100cm2), the weight of the foot guard, railing.

2. Longitudinal horizontal rod calculation: The scaffold belongs to the double-breasted fastener type steel pipe scaffolding, and the construction load is transmitted from the longitudinal horizontal rod to the vertical rod, and only the longitudinal horizontal rod is calculated, and the calculation is calculated according to the three-span continuous beam, and the calculation diagram is as follows: The bending strength is calculated according to the following formulal f—the design value of the concentrated force transmitted by the transverse horizontal rod to the longitudinal horizontal rod, f= )2 q The design value of the linear load acting on the transverse horizontal rod; q= (?

S1 QP Scaffolding Board Self-weight KN M2; QK The standard value of uniform load in construction (2kN2 during decoration construction) is taken as QK=3kNM2; F Q235 steel flexural strength design value, according to the specification table, F 205N mm2; s1 The spacing of the transverse horizontal rods of the construction layer, take s1=1200mm; Load partial factors for variable loads; A1 transverse horizontal rod extension length, take A1 300mm column spacing, take =1050mm row spacing, take =1200mm w section modulus, according to the value of Table B in Appendix B of the specification, w=; σ