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GENERAL 1.01 DESCRIPTION the WORK of This Section Includes Providing Concrete Formwork, Bracing

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GENERAL 1.01 DESCRIPTION the WORK of This Section Includes Providing Concrete Formwork, Bracing SECTION 03100 FORMWORK PART 1 -- GENERAL 1.01 DESCRIPTION The WORK of this Section includes providing concrete formwork, bracing, shoring, supports and formwork requirements for concrete construction. 1.02 RELATED SECTIONS The WORK of the following Sections applies to the WORK of this Section. Other Sections of the Specifications, not referenced below, shall also apply to the extent required for proper performance of the WORK. 1. Section 03200 Concrete Reinforcement 2. Section 03290 Joints in Concrete Structure 3. Section 03300 Cast-in-Place Concrete 4. Section 03600 Grout 1.03 STANDARD SPECIFICATIONS Except as otherwise indicated in this Section of the Specifications, the CONTRACTOR shall comply with the Standard Specifications for Public Works Construction (SSPWC), as specified in Section 01071 Standard References. 1.04 QUALITY ASSURANCE A. REFERENCES: This section contains references to the documents listed below. They are a part of this section as specified and modified. Where a referenced document cites other standards, such standards are included as references under this section as if referenced directly. In the event of conflict between the requirements of this section and those of the listed documents, the requirements of this section shall prevail. Unless otherwise specified, references to documents shall mean the documents in effect at the time of Advertisement for Bids or Invitation to Bid (or on the effective date of the Agreement if there were no Bids). If referenced documents have been discontinued by the issuing organization, references to those documents shall mean the replacement documents FORMWORK DECEMBER 2014 PWS CONTRACT NO. 13-40UTIL 03100-1 issued or otherwise identified by that organization or, if there are no replacement documents, the last version of the document before it was discontinued. Where document dates are given in the following listing, references to those documents shall mean the specific document version associated with that date, regardless of whether the document has been superseded by a version with a later date, has been discontinued, or has been replaced. Reference Title PS 1 U.S. Product Standard for Concrete Forms, Class I. ACI 116R Cement and Concrete Terminology ACI 117 Standard Tolerances for Concrete Construction and Materials ACI 347 Recommended Practice for Concrete Formwork ACI 347R Guide to Formwork for Concrete B. TOLERANCES: The variation from established grade or lines shall not exceed 1/4 inch in 10 feet and there shall be no offsets or visible waviness in the finished surface. All other tolerances shall be within the tolerances of ACI 117. C. DESIGN: Formwork design requirements shall conform to the following: 1. Formwork, shoring, and reshoring shall be designed by a civil or structural engineer currently registered in the State of California having a minimum of 3 years experience in this type of design work. 2. Design and engineering of formwork, shoring and reshoring, as well as its construction, is the responsibility of the Contractor. 3. A procedure and schedule shall be developed for removal of shores (and installation of reshores) and for calculating the loads transferred to the structure during this process. 4. Structural calculations shall be made as required to prove that all portions of the structure in combination with remaining forming and shoring system has sufficient strength to safely support its own weight plus the loads placed thereon. 5. When developing procedure, schedule, and structural calculations, consideration shall be made regarding the structural system that exists, effects of all loads during construction and strength of concrete at each state of construction. FORMWORK 03100-2 PWS CONTRACT NO. 13-40UTIL DECEMBER 2014 D. DESIGN CRITERIA: Design of formwork shall conform to the following criteria: 1. Formwork shall be designed for loads, lateral pressures and allowable stresses outlined in ACI 347R and for design considerations, wind loads, allowable stresses and other applicable requirements of the controlling local building code. Where conflicts occur between the above two standards, the more stringent requirements shall govern. 2. Formwork shall be made to limit maximum deflection of form facing materials reflected in concrete surfaces exposed to view to 1/240 of span between structural members. 1.05 SUBMITTALS Submittals shall be provided in accordance with Section 01300 and shall include the following information: 1. A copy of this specification section, with addendum updates included, with each paragraph check-marked to indicate specification compliance or marked to indicate requested deviations from specification requirements. A check mark shall denote full compliance with a paragraph as a whole. If deviations from the specifications are indicated, and therefore requested by the Contractor, each deviation shall be underlined and denoted by a number in the margin to the right of the identified paragraph referenced to a detailed written explanation of the reasons for requesting the deviation. The Construction Manager shall be the final authority for determining acceptability of requested deviations. The remaining portions of the paragraph not underlined will signify compliance on the part of the Contractor with the specifications. Failure to include a copy of the marked-up specification sections, along with justification(s) for any requested deviations to the specification requirement, with the submittal shall be sufficient cause for rejection of the entire submittal with no further consideration. 2. Manufacturer's installation instructions and acknowledgement that products submitted meet requirements of standards referenced. 3. Manufacturer and type of proposed form materials, form ties and form coating materials. 4. Formwork designer qualifications. 5. If requested, structural analysis and concrete strength data used in planning and implementing form removal and shoring. FORMWORK DECEMBER 2014 PWS CONTRACT NO. 13-40UTIL 03100-3 1.06 SHOP DRAWINGS AND SAMPLES The following shall be submitted in compliance with Section 01300. A. FALSEWORK CALCULATIONS AND DRAWINGS: The CONTRACTOR's attention is directed to the provisions of Section 1717 of the Division of Industrial Safety, Construction Safety Orders, as revised November 1973, which requires that all falsework or vertical shoring installations where the height of the falsework or vertical shoring, as measured from the top of the sills to the soffit of the superstructure, exceeds 14 feet, or where individual horizontal span lengths exceed 16 feet, or provision for vehicular or railroad traffic through falsework or vertical shoring is made, shall be approved and signed by a civil engineer, registered in the State of California; provided further, that a copy of the falsework plan or shoring layout shall be available on the job site at all times. B. DETAILED PLANS OF THE FALSEWORK PROPOSED TO BE USED: Such plans shall be in sufficient detail to indicate the general layout, sizes of members, anticipated stresses, grade of materials to be used in the falsework, means of protecting existing construction which supports falsework, and typical soil conditions. C. CATALOG INFORMATION ON: 1. Form ties and all related accessories, including taper tie plugs, if taper ties are used. 2. Form gaskets. 1.07 QUALITY ASSURANCE A. TOLERANCES: The variation from established grade or lines shall not exceed 1/4 inch in 10 feet and there shall be no offsets or visible waviness in the finished surface. All other tolerances shall be within the tolerances of ACI 117. PART 2 -- PRODUCTS 2.01 GENERAL Materials for concrete forms and falsework shall conform to SSPWC Subsection 303-1.3 and the requirements herein. FORMWORK 03100-4 PWS CONTRACT NO. 13-40UTIL DECEMBER 2014 Except as otherwise expressly accepted, all lumber brought on the job site for use as forms, shoring, or bracing shall be new material. All forms shall be smooth surface forms and shall be of the following materials: Walls - Steel or plywood panel Columns - Steel, plywood, or fiber glass Roof and floor - Plywood All other work - Steel panels, plywood or tongue and groove lumber Form materials which may remain or leave residues on or in the concrete shall be classified as acceptable for potable water use by the Environmental Protection Agency within 30 days of application or use. 2.01 FORMS AND FALSEWORK MATERIALS Materials for concrete forms, formwork, and falsework shall conform to the following requirements: 1. Lumber shall be Douglas Fir or Southern Pine, construction grade or better, in conformance with U.S. Product Standard PS20. 2. Plywood for concrete formwork shall be new, waterproof, synthetic resin bonded, exterior type Douglas Fir or Southern Pine plywood manufactured especially for concrete formwork and shall conform to the requirements of PS 1 for Concrete Forms, Class I, and shall be edge sealed. 3. Form materials shall be metal, wood, plywood, or other approved material that will not adversely affect the concrete and will facilitate placement of concrete to the shape, form, line, and grade shown. Metal forms shall be an approved type that will accomplish such results. Wood forms for surfaces to be painted shall be Medium Density Overlaid plywood, MDO Ext. Grade. Unless otherwise indicated, exterior corners in concrete members shall be provided with 3/4-inch chamfers. Re-entrant corners in concrete members shall not have fillets unless otherwise indicated. Forms and falsework to support the roof and floor slabs shall be designed for the total dead load, plus a live load of 30 psf (minimum). A. WOOD FORMS: Wood forms shall be new 5/8-inch or 3/4-inch, 5-ply structural plywood of concrete form grade. Forms shall be built-in-place type or pre-fabricated panel. Built in place type forms shall FORMWORK DECEMBER 2014 PWS CONTRACT NO. 13-40UTIL 03100-5 be 4 by 8 foot sheets except where smaller pieces will cover entire area. When approved by the Construction Manager, plywood may be reused. B. METAL FORMS: Metal forms excluding aluminum may be used. Forms shall be tight to prevent leakage, free of rust and straight without dents to provide members of uniform thickness.
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