034100-Plant-Precast Structural Concrete.pdf

Steam Supply and Condensate Plant-Precast Structural Concrete Return Piping Replacement 034100-1 PGRU, Geneva, NY

SECTION 034100

PLANT-PRECAST STRUCTURAL CONCRETE

PART 1 GENERAL

1.1 SUMMARY

A. Section includes structural precast concrete for:

1. High Pressure Steam Tunnel.

1.2 REFERENCES

A. American Concrete Institute:

1. ACI 301 - Specifications for Structural Concrete.

2. ACI 318 - Building Code Requirements for Structural Concrete.

B. ASTM International:

1. ASTM A36/A36M - Standard Specification for Carbon Structural Steel.

2. ASTM A185 - Standard Specification for Steel Welded Wire Fabric, Plain, for

Concrete Reinforcement.

3. ASTM A497 - Standard Specification for Steel Welded Wire Fabric, Deformed, for Concrete Reinforcement.

4. ASTM A615/A615M - Standard Specification for Deformed and Plain Billet-

Steel Bars for Concrete Reinforcement.

5. ASTM C150 - Standard Specification for Portland Cement.

C. Precast/Prestressed Concrete Institute:

1. PCI MNL-116S - Manual for Quality Control for Plants and Production of

Precast and Prestressed Concrete Products.

2. PCI MNL-120 - PCI Design Handbook - Precast and Prestressed Concrete.

3. PCI MNL-123 - Design and Typical Details of Connections for Precast and

Prestressed Concrete.

1.3 DESIGN REQUIREMENTS

A. Size components to withstand design loads in a restrained and unrestrained condition as indicated on the Drawings and in accordance with the following:

1. Building Code of New York State, ASCE 7-02 and ACI 318-99.

2. Handling load cases including but not limited to:

a. Stripping.

b. Storage.

c. Shipping.

d. Erection.

B. Maximum Allowable Deflection: 1/180 span.

Return Piping Replacement 034100-2

C. Design system to accommodate construction tolerances, deflection of other building structural members and clearances of intended openings.

1.4 SUBMITTALS

A. Shop Drawings: Indicate layout, tunnel profile, unit locations, fabrication details, unit identification marks, reinforcement, connection details, support items, dimensions, openings, and relationship to adjacent materials , and sealed by professional engineer.

B. Product Data: Indicate standard component configurations, design loads, deflections, cambers, and bearing requirements.

C. Design Data: Submit design data reports indicating calculations for loadings and stresses of fabricated, designed framing and connections.

1.5 QUALITY ASSURANCE

A. Perform Work in accordance with requirements of PCI MNL-116S, PCI MNL-120, PCI

MNL-123.

1.6 QUALIFICATIONS

A. Fabricator: Company specializing in performing Work of this section with minimum three years documented experience.

1.7 DELIVERY, STORAGE, AND HANDLING

A. Handle precast members in position consistent with their shape and design. Lift and support only from support points.

B. Lifting or Handling Devices: Capable of supporting member in positions anticipated during manufacture, storage, transportation, and erection.

C. Protect members to prevent staining, chipping, or spalling of concrete.

D. Mark each member with date of production and final position in structure.

1.8 COORDINATION

A. Coordinate the Work of framing components not pre-tensioned but associated with the Work of this section..

PART 2 PRODUCTS

2.1 FABRICATORS

A. Fabricators:

1. Binghamton Precast & Supply.

Return Piping Replacement 034100-3

2. Riefler Concrete Products.

3. Jefferson Concrete Corp.

4. Substitutions: Permitted.

2.2 MATERIALS

A. Cement: Portland, conforming to ASTM C150 Type I.

B. Aggregate, Sand, Water, and Admixtures: Determined by precast fabricator, as appropriate to design requirements and PCI MNL-116S.

2.3 CONCRETE MIX

A. 3500 psi, Air Entrained, Submit mix design.

2.4 REINFORCEMENT

A. Reinforcing Steel: ASTM A615/A615M, 60 ksi yield grade; deformed billet steel bars.

B. Welded Steel Wire Fabric: ASTM A497 Deformed Type, 65 ksi yield grade; in flat sheets.

2.5 FABRICATION

A. Fabrication procedure to conform to PCI MNL-116S.

B. Maintain plant records and quality control program during production of precast members. Make records available upon request.

C. Ensure reinforcing steel, anchors, inserts, plates, angles, and other cast-in items are embedded and located as indicated on shop drawings

2.6 FINISHES

A. Cure members under identical conditions to develop required concrete quality, and minimize appearance blemishes including non-uniformity, staining, or surface cracking.

B. Plant Finish (Finish A): Normal plant finish; surface may contain small surface holes caused by air bubbles, minor chips or spalling at edges or ends, without major discoloration.

2.7 FABRICATION TOLERANCES

A. Conform to PCI MNL-116S.

2.8 SOURCE QUALITY CONTROL AND TESTS

A. Take three (3) concrete test cylinders for every 30 cu yds of concrete placed in accordance with ASTM C31.

Return Piping Replacement 034100-4

B. Take one (1) slump tests for every three (3) test cylinders in accordance with ASTM C143.

C. Take one air entrainment test cylinder for each set of exterior concrete test cylinders taken.

PART 3 EXECUTION

3.1 EXAMINATION

A. Verify site conditions are ready to receive work and field measurements are as indicated on shop drawings.

3.2 PREPARATION

A. Prepare cast-in-place base slab to accept precast tunnel sections.

3.3 ERECTION

A. Erect members without damage to structural capacity, shape, or finish. Replace or repair damaged members.

B. Align and maintain uniform horizontal and vertical joints, as erection progresses.

3.4 ERECTION TOLERANCES

A. Erect members level and plumb within allowable tolerances.

B. Conform to PCI MNL-116S.

C. Exposed Joint Dimension: 3/8 inch plus or minus 1/4 inch.

D. When members cannot be adjusted to conform to design or tolerance criteria, cease work and advise Architect/Engineer. Execute modifications as directed by Architect/Engineer.

3.5 PROTECTION OF INSTALLED CONSTRUCTION

A. Protect members from damage caused by field welding or erection operations.

B. Use non-combustible shields during welding operations to protect adjacent Work.

END OF SECTION