The entrance ladder represents the first access road for reaching the bridge inspection facility. It should be built into a structure that is easy to enter/exit and can absorb maximum expansion length by considering the difference between bridge expansion length and pier expansion length, as well as ensuring beautiful appearance, safeness, and effective access control.

Type

Weightless type

Stair type

Opening(protrude) type

When being fixed

When entering and exiting (accessing)

Expansion length

Infinite absorption

Fixation

Fixation

Access control

1

3

2

Economic feasibility

2

3

1

Constructability

2

3

1

External aesthetic

1

3

2

Possibility of breakage

3

2

1

Life span

1

3

2

Weightless type

Infinite absorption

1

2

2

1

3

1

Stair type

Fixation

3

3

3

3

2

3

Opening(protrude) type

Fixation

2

1

1

2

1

2

※ The access ladder should allow all bridges to be managed with single key. It should be able to control the access by unauthorized persons. When it is installed on water or river, it should be installed downstream to prevent floating debris from gathering. It should have a structure capable of absorbing the expansion length of bridge.