713TEMPORARY BRIDGES AND APPROACHES

713.01Description

This work shall consist of the construction and maintenance of temporary pile or timber trestle bridges and approaches in accordance with 105.03.

MATERIALS

713.02Materials

Materials shall be in acco rdance with the following: 10

Delineator Posts ........................................................... 910.15 Delineators................................................................... 926.02 Fence ........................................................................... 910.18

713.02

CONSTRUCTION REQUIREMENTS

713.03General Requirements

Unless otherwise provided, the right-of-way will be furnished for temporary 20 bridges and approaches.

Information indicating the details of the temporary bridge proposed to be built shall be submitted for approval. If this information is not in accordance with the plans, details of the proposed temporary bridge signed by and bearing the seal of a registered professional engineer shall be submitted. These details shall be supplied in triplicate or in such form that may be reproduced readily. Information or details, or both if required, regarding temporary bridges shall be submitted and approved before work is started.

Where it is necessary to remove existing fence, a temporary fence shall be erected along the temporary right-of-way line, if so directed. This fence shall be substantially as good as the existing fence. It shall be built and maintained satisfactorily.

713.04Temporary Bridge

Unless otherwise provided, the temporary bridge shall have a clear roadway of no less than 28 ft and be designed to carry an HS20 truck loading. The bridge shall be provided with substantial railings which shall be kept painted white. Backwalls shall be built at each end bent to hold the approach fills. Each bent shall have at least four piles or four substantial posts on an adequate mudsill. 40

The temporary bridge shall be built to an elevation of not less than that shown on the plans. It shall have a clear length opening no less than shown or otherwise designated. Unless otherwise specified, a ll timber and piles may be treated or untreated.

713.05Temporary Pipe

The minimum thickness required for the temporary pipe or pipe-arch shall be as follows:

Thickness, in. Pipe Diameter, in. 0.064 48 or less 0.079 54 or less 0.109 72 or less 0.138 78 or less 0.168 84 or less

713.03

Thickness, in. Pipe-Arch Area, sq ft 0.109 40 or less 0.138 58 or less

Thickness, in. Pipe-Arch Area, sq ft 0.111 38 or less 0.140 71 or less 0.170 122 or less 0.188 131 or less

For thicknesses, diameters, or areas not listed above, the Engineer shall be 60 contacted for approval.

713.06Temporary Approaches

Temporary approaches shall be constructed to a line and grade which will provide a reasonably convenient and safe connection between the temporary bridge and the existing road. The grade and crown elevation shall be as shown on the plans. The roadway and slopes shall be as shown on the plans. All necessary drainage shall be provided. Embankment shall be compacted in accordance with 203. If it becomes necessary to reconstruct the connection of the approaches with the existing roadway, either because of the operations or other cause, such adjustment shall be made as 70 directed.

HMA pavement for temporary approaches shall be in accordance with 402. Temporary pavement markings in accordance with 801.12 shall be placed as shown on the plans. Delineators in accordance with 804 shall be placed as shown on the plans.

Guardrail and guardrail end treatment sh all be provided at each corner of the temporary bridge as shown on the plans or as directed. The furnishing of materials and installation shall be provided in accordance with 601. After removal, the guardrail and guardrail end treatment will remain the property of the Contractor. 80

713.07Maintenance

Unless otherwise provided, where a temporary bridge is required, traffic over the existing bridge shall be allowed until the temporary bridge and approaches are satisfactorily completed and opened to traffic. They shall be so maintained until the new structure is opened to traffic. The necessary material and labor shall be furnished to repair or replace any portion of the temporary bridge and approaches which may have deteriorated under traffic. During the winter months, salt or other equivalent materials shall be used as directed to prevent slippery conditions.

713.07

713.08Removal

When the new work is opened to traffic, all the temporary work shall be removed and the temporary right-of-way shall be restored as nearly as possible to its original or satisfactorily altered state. All bents in the stream shall be removed entirely or down to the bed of the stream. All other bents either removed entirely or to 2 ft below the ground surface, unless the property owner of the temporary right-of-way consents in writing to have them cut at the ground line. Temporary bituminous HMA pavement, when no longer required for maintenance of traffic, shall be removed and disposed of in accordance with 203.10.

713.09Method of Measurement

Temporary bridges, temporary pipes, and approaches will not be measured for payment unless otherwise specified. HMA mixtures for temporary pavement will be measured by the ton. Guardrail of the type specified will be measured by the linear foot along the top of rail. Guardrail end treatments will be measured per each of the type specified. Temporary pavement markings will be measured in accordance with

801.17. Seeding and sodding will be measured in accordance with 621.13. The

removal and disposal of temporary HMA pavement will not be measured for payment.

713.10Basis of Payment 110

The accepted quantities of temporary bridge and approaches, or temporary pipe and approaches will be paid for at the contract lump sum price for the work, complete in place and later removed as specified. HMA mixtures for temporary pavement will be paid for as the type of mixture specified, in accordance with 610.06, complete in place. Guardrail installed along approaches wi ll be paid for at the contract unit price per linear foot. Guardrail end treatment will be paid for at the contract unit price per each for the type specified. Temporary pavement markings will be paid for in accordance with 801.18.

Seeding and sodding will be paid for in accordance with 621.14. 120

If adjustment of approach embankments is necessary, the additional excavation and borrow will be paid for in accordance with 203.28.

Payment will be made under:

Pay Item Pay Unit Symbol

Guardrail End Treatment, _____, Temporary type 130 Bridge Approaches ............................................................. EACH Guardrail, W-Beam, ____ ft. ____ in. Spacing, Temporary Bridge Approaches ........................................... LFT Temporary Bridge and Approaches ........................................... LS Temporary Bridge ..................................................................... LS Temporary Pipe and Approaches .............................................. LS Temporary Pipe ......................................................................... LS 713.08

The cost of excavation, embankment, backfill, removal and disposal of temporary HMA pavement, delineators, and temporary fence, shall be included in the cost of the 140 pay items.

The cost of furnishing, installation, and removal of guardrail and guardrail end treatment shall be included in the cost of the pay items.

If the Contractor elects to build a longer bridge or approaches than specified, such work shall be done with no additional payment. If such work requires additional right- of-way, it shall be provided with no additional payment.