[Chapter 1] Section 2 Scaffolding Material, Structure, and Assembly Drawing⑦

8 Precautions for assembling, dismantling, etc., of scaffold

（１） Concept of risk assessment at the time of work planning

1.When planning work, consider essential fall prevention measures based on the anticipated work procedures, change materials, etc., and select various safe construction methods.

2.Consider procedures to prevent falls without the use of fall protection equipment as much as possible.

3.Incorporate the results of the risk assessment into work procedures.

4.The operations chief, etc. make the completed work procedures known to juniors and share them.

5.Use fall prevention equipment as a “precaution” or “last resort.

6.Do not have the mindset of “just use fall prevention equipment” if something happens.

7.Use fall prevention equipment in useful situations.

8.If the use of fall prevention equipment is not effective, devise ways to use them or install fall prevention equipment such as netting.

9 Scaffolding assembly work instructions

(1) Work procedures basically use verbs to describe body movements.

For example, “do ____,” “install ____,” and “remove ____.”

As a general rule, work procedures are prepared by the primary subcontractor on the company’s responsibility. The work procedures are then checked by the primary contractor and distributed to the subcontractors if approved. Secondary or tertiary subcontractors, etc., use the work procedures prepared by the primary subcontractor as the basis for their own work.

Example of assembly workflow of prefabricated scaffold level 1

Procedure	Addendum to the main points (Safety, success, and ease of doing)
1. Clear the ground	・Scaffold footings to be level. ・(If there is a risk of subsidence) perform after rolling pressure
2. Line up the planks	・The width should be about 200 mm between the outer wall of the building frame and the inner width of the sill plate. ・Match the width of the building frame
3. Place the jack base	・At 1,800 mm intervals ・After adjusting the initial height to ◯ ◯ cm
4.Erect the frame	・Insert it into the jack base.
5.Install the diagonal brace	・One person holds the frame ・To the left and right
6.Erect the frame
7.Install the diagonal brace	・Connect the frames of 4. and 6.
8. Repeat 6. – 7. until 6.
9.Repair the passage of frame	・Parallel to the outer wall of the building frame ・So that the jack base is in the center of the planks.
10.Adjust the height of the frame	・Use the level, turn the jack handle,
11.Mount the bridge batten pipe	・Girder direction first ・The distance between the outside wall and the frame is ◯ ◯ cm.
12.Nail the jack base	・Two places with one
13.Attach the handrail frame	・Check the fixing method.
14.Attach floor ledger form	・Don’t let fingers get caught in hook.

* The steps may switch in some cases.

 

Names of parts used for assembling work, etc., of scaffold

Assembly etc., of scaffold	General term for scaffolding assembly, alteration, and dismantling operations
Building frame	Structural member made of steel pipe welded into a torii-shape
Diagonal brace	X-shaped reinforcement to prevent buckling under load
Floor ledger form (Anti)	Ledger frame with a work floor
Ledger form	Frame-Like member connected in horizontal direction
Lower rail	Horizontal member for fall prevention for frame assembling scaffold
XX rail	Horizontal member for fall prevention (handrail at top)
Handrail frame	Member for fall prevention integrating handrail and diagonal brace
Standards	Main vertical member of scaffold
Work floor	Space for work
Single-pipe scaffold	Scaffold installed by combining steel pipe and fastening metal fitting
Single-pipe	JIS standard steel pipe
Tensioning metal fitting (Clamp)	Hardware for connecting steel pipes, fixed at 90 degrees and free at 360 degrees
Single-pipe joint	Hardware that connects steel pipes
Handrail	Horizontal member for fall prevention to be mounted on upper stage
Middle rail	Horizontal member for fall prevention to be attached to second stage
Baseboard (150 mm)	Horizontal member for fall prevention provided on working floor
Baseboard (100 mm)	Horizontal member for preventing falling object installed on working floor
Bridge batten	Ledger material in the direction of girder (longitudinal direction) for fix the height of scaffold horizontally
Ledger pipe	When it is attached to the foot of the ledger material (pipe) in the direction of girder (length) connecting horizontal direction, it is called “root girdle pipe.”
Beam direction	Between the front and back steps
Brace	Reinforcing material for preventing buckling
Large brace	Buckling prevention reinforcing material provided on the entire structure surface
Firing pipe	Member for reinforcing corner part for preventing distortion
Binding part	Connection for fixing wedge binding scaffold
Safety net	Net for fall prevention (Anti-Net)
Vertical net	Fall prevention net (Mesh sheet, etc.)