Types of drainage pipes and construction examples

Overflow tubular type
Clean-out
Standard type
sand pit type

Injection type

A drainage method to prevent damage to scour and agricultural crops on the lower part of bridge through use of injection device.

U-shaped drain pipe

Comparison and review of drainage pipe type

Category

Overflow tubular type

Clean-out

Standard type

Injection type

Cross-sectional drawing

Overview

The initial stormwater is passed to the treatment facility and the stormwater is drained directly under the bridge, and the pipe diameter can be minimized regardless of the length of the bridge.

If the sand or impurities, etc., on the bridge are deposited in drainage pipe, they can be removed through the opening in the end part, and a sand pit is additionally installed.

It is a common method for installation on bridges nationwide. There is no need for separate facility, and a vertical drainpipe is installed for each pier of bridge.

Damage to agricultural crops or scour on the lower ground part of bridge is minimized when stormwater, etc., are discharged to the lower part of the bridge at the end of river drainage pipe.

Constructability

3

4

2

1

Change in pipe diameter

None

Changing according to length of bridge

None

Economic feasibility(cost-effectiveness)

2

4

3

1

Outward appearance

2

4

3

1

Domestic Construction achievement

2

3

1

4

Maintenance

2

3

4

1

Conclusion

Bridge drainage facilities, the auxiliary facilities of bridges, are economical. Particularly, facilities that do not require maintenance due to clogging should be applied. The method of discharging each bridge pier should be excluded.

Overflow tubular type

The initial stormwater is passed to the treatment facility and the stormwater is drained directly under the bridge, and the pipe diameter can be minimized regardless of the length of the bridge.

3

None

2

Bridge drainage facilities, the auxiliary facilities of bridges, are economical. Particularly, facilities that do not require maintenance due to clogging should be applied. The method of discharging each bridge pier should be excluded.

Clean-out

If the sand or impurities, etc., on the bridge are deposited in drainage pipe, they can be removed through the opening in the end part, and a sand pit is additionally installed.

4

Changing according to length of bridge

4

3

Bridge drainage facilities, the auxiliary facilities of bridges, are economical. Particularly, facilities that do not require maintenance due to clogging should be applied. The method of discharging each bridge pier should be excluded.

Overflow tubular type

It is a common method for installation on bridges nationwide. There is no need for separate facility, and a vertical drainpipe is installed for each pier of bridge.

2

Changing according to length of bridge

3

1

4

Bridge drainage facilities, the auxiliary facilities of bridges, are economical. Particularly, facilities that do not require maintenance due to clogging should be applied. The method of discharging each bridge pier should be excluded.

Overflow tubular type

Damage to agricultural crops or scour on the lower ground part of bridge is minimized when stormwater, etc., are discharged to the lower part of the bridge at the end of river drainage pipe.

1

None

1

4

1

Bridge drainage facilities, the auxiliary facilities of bridges, are economical. Particularly, facilities that do not require maintenance due to clogging should be applied. The method of discharging each bridge pier should be excluded.

Business Area

Bridge Drainage Facilities(Drainpipe)

Types of drainage pipes and construction examples

Injection type

U-shaped drain pipe

Comparison and review of drainage pipe type

Drainpipe

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