# Rigging I - Simply Circus Community

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15 Νοε 2013 (πριν από 4 χρόνια και 4 μήνες)

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Simply Circus

14 Pierrepont Rd (617) 527
-
0667

Newton, MA 02462 Info@SimplyCircus.com

www.SimplyCircus.com

Rigging I:

Transferring forces all the
way down to the ground

Presentation by Steven Santos

Key points for this presentation

What forces do we need to be aware of?

Rated Strength, SWL, MBS, LBS, KN, SLUG, etc

Overview of tracking forces

Risk Assessments for Rigging

Commonly Used Mount Points

Questions!

What forces do we

need to be aware of?

In

the

world

of

aerial

rigging,

we

need

to

be

aware

of

all

of

the

forces

we

could

possibly

put

on

the

rigging
.

This

includes

the

static

and

the

shock

We

also

need

to

be

aware

of

the

directions

of

those

forces
.

A

static

places

forces

on

the

mount

point

differently

than

does

a

swinging

and

both

are

different

from

a

spinning

.

What forces do we need to be aware of?

When it comes to aerial rigging, we are
generally concerned with four classes of force:

Lyra

Static Trapeze

Aerial Silks (except drops)

rapid change of movement, such as impacting or
generally significantly greater than the static

Drops

A

Swinging

is

a

that

is

in

motion

horizontally
.

By

definition,

Swinging

cause

side

of

the

mount

point
.

In

a

straight

swing,

the

highest

are

at

4
:
30

and

7
:
30

Swinging Trapeze

Flying Trapeze

Some Aerial Silks

Swinging Lyra

rotation. By definition, Spinning Loads cause

Cordless Lisse

Spanish Web

Some Silks Skills

Strength Terms

Rated Strength is the strength the manufacturer has
determined the equipment should take.

SWL

=

Safe

Working

.

SWL

is

one

way

that

manufacturers

rate

strength
.

SWL*safety

factor=MBS

Safety

Factor

is

a

number

that

the

tensile

strength

is

divided

by

in

order

to

determine

the

safe

working

MBS = Mean Breaking Strength. MBS is the average
breaking strength the equipment is tested to.

Weights and Forces

One

of

the

difficulties

with

rigging

circus

apparatus

is

that

we

end

up

using

rigging

components

from

many

different

industries,

almost

none

actually

designed

for

how

we

use

them
.

Some

equipment

uses

the

S
.
I
.

system,

where

weight

is

expressed

in

kilograms

(a

mass),

newtons

(a

force)

and

kilonewtons

(a

force

with

mass)
.

Other

use

the

English

system,

where

weight

is

expressed

in

pounds

(a

force

with

mass)
.

When

dealing

with

rigging

components,

it

is

often

to

convert

everything

to

use

one

numbering

system

or

the

other
.

Overview of Tracking Forces

When

ever

we

set

up

rigging,

we

want

to

start

by

checking

over

the

mount

point,

and

follow

the

forces

all

the

way

down

to

the

ground
.

DO NOT ASSUME ANYTHING

Is the horizontal beam strong enough for what we
want to do?

Are the vertical beams strong enough for what we
want to do?

Is the connection between the vertical and
horizontal beams strong enough for what we want
to do?

How does our mount point deal with horizontal
forces? Is it strong enough for what we want to
do?

If it is not strong enough, how do we make it
strong enough?

WLA

is

the

process

of

systematically

examining

each

and

every

component

of

a

rigging

setup

to

find

the

weakest

.

Once

identified,

rigging

is

designed

and

built

with

the

weakest

in

mind,

and

with

the

desired

safety

factor
.

Risk Assessments for Rigging

A Risk
Assessment
for Rigging
is done
much like
any other
Risk
Assessment.

Striar JCC Points 1

5 Risk
Assessment / WLA

Silks Risk Assessment / WLA

Likelihood / Severity

0 Extremely Unlikely

1 Unlikely

2 Possible

3 Likely

4 Very Likely

0 Ext. Insignificant

1 Insignificant

2 Minor

3 Moderate

4 Major

Commonly Used Mount Points

Roof Trusses

Freestanding Rigging Frames

Floor Trusses

Excess Capacity

Questions

Silks Rigging

Lyra

(Single Tab, Single Point)

Lyra Rigging

(Two Tabs, Single Point)