SECTION EARTHWORK

Transcription

1 SECTION PART 1 GENERAL 1.01 SCOPE OF WORK A. Furnish all labor, materials, equipment and incidentals required and perform all excavation, backfill, fill and grading required to complete the work as shown on the Drawings and as specified herein. The work shall include, but not necessarily be limited to; excavation and backfill for electrical manholes, handholes, conduits, cables, raceways and ducts; embankment and grading; disposal of waste and surplus materials; and all related work such as sheeting, bracing, and dewatering. B. All excavation, trenching and related sheeting, bracing, etc, shall conform to the requirements of the Florida "State Safety Act" (CS/SB 2626) which incorporates, by reference, OSHA's excavation safety standards, 29 CFR Subpart P. C. Excavation, backfill, and compaction for structures and piping are included in other sections as listed below RELATED WORK A. Dewatering and Drainage is included in Section and B. Rock and Boulder Excavation is included in Section C. Structural Excavation, Backfill and Compaction is included in Section D. Trenching, Bedding and Backfill for Pipe is included in Section and REFERENCE STANDARDS A. American Society for Testing and Materials (ASTM) 1. ASTM C33 - Specification for Concrete Aggregates. 2. ASTM Dl557- Test Method for Laboratory Compaction Characteristics of Soil Using Modified Effort (56,00 ft-lbf/ft (2,700kN-m/m) 3. ASTM D1682- Standard Test Methods for Breaking Load and Elongation of Textile Fabrics. 4. ASTM D Standard Classification of Soils for Engineering Purposes. IMMOKALEE ROAD CHLORAMINE BOOSTER STATION Page 1 of 6

2 5. ASTM D4751- Standard Test Method for Determining the Apparent Opening Size of a Geotextile. B. Where reference is made to one of the above standards, the revision in effect at the time of bid opening shall apply PROTECTION A. Sheeting and Bracing 1. Furnish, put in place and maintain such sheeting and bracing as may be required: by Federal, State and local safety requirements; to support the sides of excavations; to prevent any movement which could in any way diminish the width of the excavation below that necessary for proper construction; and to protect adjacent structures from undermining or other damage. Care shall be taken to prevent voids outside of the sheeting, but if voids are formed, they shall be immediately filled and rammed. Where soil cannot be properly compacted to fill a void, lean concrete shall be used as backfill. 2. In order to protect adjacent structures, installation or removal of sheeting by vibratory orhammering methods shall not be allowed. 3. Construct the sheeting outside the neat lines of the foundation, unless indicated otherwise, to the extent deemed desirable for the method of operation. Sheeting shall be plumb and securely braced and tied in position. Sheeting and bracing shall be adequate to withstand all pressures to which the structure or trench will be subjected. Any movement or bulging which may occur shall be corrected to provide the necessary clearances and dimensions. 4. Where sheeting and bracing is required to support the sides of excavations for structures, engage a professional Engineer, registered in the State of Florida to design the sheeting and bracing. The sheeting and bracing installed shall be in conformity with the design and certification of this shall be provided by the professional Engineer. Submit P.E. Certification Form contained in Section to show compliance with this requirement. 5. All sheeting and bracing not left in place shall be carefully removed in such manner as not to endanger the construction or other structures, utilities, or property. All voids left or caused by withdrawal of sheeting shall be immediately refilled with sand by ramming with tools especially adapted to that purpose, or otherwise as may be directed. 6. The right of the ENGINEER to order sheeting and bracing left in place shall not be construed as creating any obligation on his/her part to issue such orders and his/her failure to exercise his/her right to do so shall not relieve the CONTRACTOR from liability for damages to persons or property occurring from IMMOKALEE ROAD CHLORAMINE BOOSTER STATION Page 2 of 6

3 or upon the work occasioned by negligence or otherwise, growing out of a failure on the part of the CONTRACTOR to leave in place sufficient sheeting and bracing to prevent any caving or moving of the ground. 7. No sheeting is to be withdrawn if driven below mid-diameter of any pipe and under no circumstances shall any sheeting be cut off at a level lower than 1-ft above the top of any pipe. B. Pumping and Drainage 1. At all times during construction provide and maintain proper equipment and facilities to remove all water entering excavations and keep such excavations dry so as to obtain a satisfactory undisturbed subgrade foundation condition until the fills, structures or pipes to be built thereon have been completed to such extent that they will not be floated or otherwise damaged by allowing water levels to return to natural levels. Engage a Geotechnical Engineer registered in the State of Florida to design the dewatering system in accordance with Section prior to commencing work. 2. Dewatering shall at all times be conducted in such a manner as to preserve the undisturbed bearing capacity of the subgrade soils at proposed bottom of excavation. Well or sump installations shall be constructed with proper sand filters to prevent drawing of finer grained soil from the surrounding ground. 3. Take all additional precautions to prevent uplift of any structure during construction. 4. Remove the dewatering equipment after the system is no longer required SOIL TESTING A. Previous to the general placement of the fill and during such placement, the ENGINEER may select areas within the limits of the fill for testing the degree of compaction obtained. Cooperate fully in obtaining the information desired. B. Payment for testing will be made by the OWNERCONTRACTOR as part of the project. If test results are unsatisfactory, all costs involved in correcting deficiencies in compacted materials to the satisfaction of the ENGINEER, will be borne by the CONTRACTOR.. PART 2 PRODUCTS 2.01 MATERIALS IMMOKALEE ROAD CHLORAMINE BOOSTER STATION Page 3 of 6

4 A. Select Common Soil and Structural Fill shall be as specified in Section B. Common soil shall be as specified in Section C. Crushed Stone 1. Crushed stone shall conform to Florida Department of Transportation Class 57 stone gradation. D. Screened Gravel 1. Screened gravel shall be used for pipe bedding as detailed and at other locations indicated on the Drawings. 2. Screened gravel shall consist of hard, durable, rounded or subangular particles of proper size and gradation and shall be free from sand, loam, clay, excess fines and deleterious materials. The gravel shall be graded within the following limits: Sieve Size 5/8-in 1/2-in 3/8-in No.10 Percent Finer by Weight to to 45 0 to 5 IMMOKALEE ROAD CHLORAMINE BOOSTER STATION Page 4 of 6

5 PART 3 EXECUTION 3.01 BACKFILLING - COMMON FILL A. Common Fill may be used as trench backfill and fill against exterior walls of structures as indicated on the Drawings; as embankment fill; or in other areas as designated by the ENGINEER. Material conforming to the requirements of common fill shall be placed in layers having a maximum thickness of 2-ft measured before compaction. B. Common Fill shall be compacted to at least 95 percent of maximum density as determined by ASTM D1557, Method D. C. Materials placed in fill areas shall be deposited to the lines and grades shown on the Drawings making due allowance for settlement of the material and for the placing of loam thereon. D. The surfaces of filled areas shall be graded to smooth true lines, strictly conforming to grades indicated on the grading plan and no soft spots or uncompacted areas will be allowed in the work. E. No compacting shall be done when the material is too wet either from rain or from excess application of water. At such times, work shall be suspended until the previously placed and new materials have dried sufficiently to permit proper compaction DISPOSAL OF SURPLUS MATERIAL A. No excavated materials shall be removed from the site of the work or disposed of, except as specified by the ENGJNEER. Materials shall be neatly piled so as to inconvenience as little as possible the public and adjoining property OWNERS until used or otherwise disposed of as specified below. B. Suitable excavated material shall be used for fill embankments or backfill on the different parts of the work as required. C. Surplus fill shall become the property of the CONTRACTOR and shall be removed and disposed offsite DISPOSAL AND REPLACING OF ROCK A. Remove and dispose of all pieces of ledge and boulders which are not suitable for use in other parts of the work. Rock disposed of by hauling away to spoil areas is to be replaced by approved surplus IMMOKALEE ROAD CHLORAMINE BOOSTER STATION Page 5 of 6

6 excavation obtained elsewhere on the work, insofar as it is available. Any deficiency in the backfill material shall be made up with acceptable material approved by the ENGINEER. B. Fragments of ledge and boulders smaller than 50 lb weight may be used in backfilling trenches unless in the opinion of the ENGJNEER the quantity is excessive, in which case he/she may order the removal and disposal of some of this rock. The small pieces of rock used as backfill shall not be placed in trenches until the pipe has at least 2-ft of earth over it. Place these pieces of stone in thin layers alternating them with earth to be sure that all voids between the stones are completely filled with earth to prevent the occurrence of voids and settlement which will result therefrom. C. Rock may be used in embankment fill only with the approval of the ENGJNEER GRADING A. Grading in preparation for placing of loam, planting areas, paved walks and drives and appurtenances shall be performed at all places that are indicated on the Drawings, to the lines, grades and elevations shown and otherwise as directed by the ENGINEER and shall be performed in such a manner that the requirements for formation of embankments can be followed. All material encountered, of whatever nature, within the limits indicated, shall be removed and disposed of as directed. During the process of grading, the subgrade shall be maintained in such condition that it will be well drained at all times. When directed, temporary drains and drainage ditches shall be installed to intercept or divert surface water which may affect the prosecution or condition of the work. B. If at the time of grading it is not possible to place any material in its final location, it shall be stockpiled in approved areas for later use. No extra payment will be made for the stockpiling or double handling of excavated material. C. The right is reserved to make minor adjustments or revisions in lines or grades if found necessary as the work progresses, in order to obtain satisfactory construction. D. Stones or rock fragments larger than 4-in in their greatest dimensions will not be permitted in the top 6-in of the finished subgrade of all fills. END OF SECTION IMMOKALEE ROAD CHLORAMINE BOOSTER STATION Page 6 of 6