02 03 44.pdf

Repair Failing Submarine A School BQ488 RM15-1230 NAVSUBASE New London, CT

SECTION 02 03 44

SHORING

02/18

PART 1 GENERAL

1.1 GENERAL REQUIREMENTS

Drawings and general provisions of the Contract, including General and Supplemental Conditions and Division 1 Specification Sections, apply to this Section.

1.2 SCOPE OF WORK

a. Provide all labor, materials, equipment, and supervision necessary to determine the need for, to design, and to install shoring to safely support the existing structure during the work, including, but not limited to, shoring described in this Section. The Contractor is responsible for determining the need for all shoring.

1. Provide shoring at the following repairs as determined necessary by the Contractor:

a. Load Bearing CMU walls for temporary access to plumbing chase.

b. New openings in CMU Walls and Brick Veneers.

c. Precast Plank

2. Provide shoring at other locations identified during construction as required by this Specification.

b. Shoring shall be restrained against lateral movement to prevent posts and beams from tipping or shifting under vibrations due to construction activities.

c. The Contractor is responsible for limiting the construction loads to 40 psf.

1.3 DEFINITIONS

1.3.1 Shoring

Temporary supplemental members used for the support of excavations, formwork, or unsafe structures during construction or repair that are intended to be removed after completion.

1.4 SUBMITTALS

The submittals described below are for information only and not for approval. Review by the Contracting Officer does not relieve the Contractor of responsibility for designing and implementing a safe shoring system.

SD-01 Preconstruction Submittals

a. Submit calculations for the evaluation of the existing structure

SECTION 02 03 44 Page 1 and the design of the proposed shoring for review before any work is performed. The calculations shall bear the seal of a licensed professional Structural Engineer who is responsible for evaluation of the effects of the construction on the existing structure and the design of all shoring systems.

b. Submit shop drawings to the Contracting Officer for review. The shop drawings shall bear the seal of the licensed professional Structural Engineer who is responsible for the design of the shoring system. The shop drawings shall include, without limitation, the shoring system layout and details.

c. Submit procedures indicating the methods, such as wedging or jacking, that will be used to ensure that the shores are supporting the intended loads.

SD-03 Product Data

a. Submit manufacturer's product data with application and installation instructions, including load capacity ratings.

SD-07 Certificates

a. Submit field report from the Engineer of Record of the shoring system stating that shoring is installed in general conformance with the design and shop drawings.

SD-08 Manufacturer's Instructions

a. Submit copies of all safety and precautionary-measure regulations applicable to the installation and utilization of shores.

1.5 QUALITY ASSURANCE

a. The Contractor shall conduct a quality control program that includes, but is not limited to, the following:

1. Inspection of all existing conditions to ensure familiarity with the Contract requirements.

2. Establishment of procedures for executing the work.

3. Inspection of all work in progress to ensure that the work is being done in accordance with established procedures;

manufacturer's instructions; specific instructions from the Contracting Officer, if given; or recommended practices.

4. Inspection of all work completed, including visual examination of all shoring in place and correction of all defective or deficient shoring.

5. Inspection of all completed work throughout construction to ensure that shoring does not shift or fall due to demolition and/or other repair activities.

1.5.1 Qualifications

The Contractor and its site superintendent shall have at least 5 yrs' experience supervising the installation of temporary structural shoring.

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1.5.2 Preinstallation Conference

Attend a preinstallation conference to be held with a representative of the Contracting Officer, Contractor's field superintendent, foreman, shoring engineer, and other trades involved to discuss the content of the work of this Section.

1.6 GENERAL PROCEDURES

a. The Contractor shall become familiar with the intended usage of the shores and shoring systems and with the existing conditions as they affect transportation of materials, layout work, traffic control, and other conditions that may affect the installation of the shores.

b. Do not start work until the Contracting Officer has reviewed the submitted shop drawings.

1.7 COORDINATION

Coordinate the arrangement and details of the shores with the work of other trades affected by or dependent upon shoring.

PART 2 PRODUCTS

2.1 MATERIALS FOR SHORING AND BRACING

a. Shores and shore assembly components supplied by the Contractor, including cribbing, base frames, base plates, cap plates, head screw jacks, "U" heads, cross bracing, and frame spacers, shall be a manufactured or custom-fabricated steel product.

b. All shore assembly components shall be free of structural damage and in good working order. In particular, the screw jacks shall be free of rust and grime and shall be lubricated so as to have smooth operation during height adjustment of the head.

c. Shore assembly components shall be examined by the Contractor immediately after delivery. Components not meeting the criteria of Para. 2.1.2 shall be removed from the project site. The Contractor shall replace the rejected shore components without any additional costs to the Owner

PART 3 EXECUTION

3.1 DESIGN AND CONSTRUCTION

a. Temporary shoring shall be designed by the Contractor's engineer and constructed by the Contractor adopting the following criteria:

1. Temporary shoring shall support the dead weight of the existing structure and the construction loads with a minimum factor of safety (ultimate capacity divided by working load) of 2.5 on shoring so as not to overload the existing floors and construction on which it bears.

2. Shoring posts shall be restrained against lateral movement by mechanical anchors into the underside of the slab or beams and/or blocking in order to prevent posts from tipping or shifting under

SECTION 02 03 44 Page 3 vibrations from construction activities. If mechanical anchors are used, the Contractor shall locate all reinforcement prior to installing anchors and avoid cutting into reinforcement. Lateral restraint shall also meet the minimum requirements of the shoring system manufacturer.

b. The arrangement of the shoring shall be in conformance with the shop drawings.

c. All shores shall be checked and adjusted where required, prior to, during, and after each demolition and concreting operation.

d. All shores shall be maintained with a tight fit.

e. "Temporary" shoring shall remain in place for a minimum of seven days after concrete placement, irrespective of concrete strength.

Thereafter, the shoring may be removed after concrete attains 75 percent of specified twenty-eight-day compressive strength. The Contractor shall determine compressive strength of concrete and submit to Contracting Officer for record prior to shore removal.

3.2 GENERAL SAFETY REQUIREMENTS

The erection and operation of shores shall conform to all safety and precautionary measures as recommended by the Scaffolding and Shoring Institute and in accordance with all state, local, and federal codes, ordinances, and regulations.

3.3 CONSTRUCTION ADMINISTRATION

Shoring Engineer of Record shall visit the site in order to confirm shoring is installed in accordance with shop drawings.

a. Provide field report to Contracting Officer.

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