Table 516 Replacement of Damaged Sheet Pile Wall

Problem: Existing steel sheet pile structure has been damaged beyond repair by patching resulting in loss of backfill, weakened structure, and reduced vertical load capacity of deck. Repair involves the use of pile driving equipment and normally would not be done solely by UCT personnel.

Description of Repairs: A new steel sheet pile wall is installed outboard of the existing sheet pile and is joined to the existing sheet pile by a tie rod. Conduct a soils evaluation and diver inspection of existing sheet pile wales, tie rods, to provide information for an engineering analysis of the structure and determine suitability of repairs. A new sheet pile can be installed inboard if environmental restrictions prevent outboard installation.

CAUTION: Before beginning construction: Secure area from marine and vehicular traffic. Obtain clearances from local authorities.

New Sheet Pile Outboard Existing Wall: (Figure 1) If existing tieback system is in good condition, then proceed with installation of new wall, otherwise install new tieback anchor system. See tieback anchor installation procedure (Section 5.6.4).

• Drive new sheet piling outboard of existing sheet piling and install new wale.

• Drill holes through wale/pile large enough for tie rod and electrical isolation collars.

• Install connecting rod through sheet pile and attach to anchor system on existing sheet pile, wale, or tie rod.

• The new sheet pile wall must be electrically isolated from the existing (Figure 2) wall to reduce the effects of galvanic corrosion. Install insulating sleeves and washers as shown in detail.

• Backfill between walls as directed by engineering and install new surface treatment.

New Sheet Pile Behind Existing Wall: (Figure 3) (Primarily provides a method of reducing loss of backfill behind an otherwise structurally sound existing sheet pile wall.)

• Remove decking and excavate behind wall to determine location of existing tieback anchor system and install timber wales to act as template for driving new sheeting.

• Drive new sheet pile wall: At tie rod location drive sheeting at a slight angle, notch, and force together.

• If new sheet piling is more than 1 foot behind existing, then cut tie rod outboard of new wall and provide new wale system on new sheet piles and remove existing sheet pile.

• Backfill and install surface decking.

New steel sheet piling

Tie back to existing rod (as shown) and MHW

electrically isolate from new sheet/wale

Drainage pipe

Existing steel sheet piles

New design as required^ —

New steel sheet piling

Existing steel sheet piles

New design as required^ —

Drainage pipe

Drainage Behind Sheet Pile Wall

Electrically isolate old tie rod from new sheet pile or new tie rod from old sheet pile

Electrically isolate old tie rod from new sheet pile or new tie rod from old sheet pile

Was this article helpful?

0 0

Post a comment