Backfill definition is to refill something, such as an excavation usually with excavated material. Excavation and backfilling of soil work sequence and procedure. When it comes to backfilling, freedraining backfill thats free of any construction debris will relieve hydrostatic pressure on the foundation walls, minimizing the burden on your foundation waterproofing. The material is required to contain no more than 10 % passing the no. Factors affecting backfilling in foundation choosing the right backfill material compacting the backfill period of backfilling types of. Guidance on the interpretation of the term backfilling. These standard specifications for the construction of roads and bridges on federal highway projects are issued primarily for constructing roads andbridges on federal highway projects under the direct administration of the federal highway administration. Tiein pointsinterferences encountered during project construction.
The construction and execution of any building demand a contract form such as direct executionetc. Native backfill shall conform to the requirements for class e backfill as defined in the standard specifications for public works construction, aggregates for bedding and backfill. What is the is code for backfilling in construction. In some cases this may be accomplished by installing ditches, either permanent or temporary, prior to construction. City of plymouth specifications for general backfill. However, the wfd itself does not provide a definition for backfilling. Backfilling shall be so placed that the pipe will not be displaced or damaged. Associated with the term backfilling is the notion of a permanent placement of the material onin particular sites, it is not intended be returned to. Backfill shall be of acceptable quality, free from large or frozen lumps, wood or. Section 02220 trenching, backfilling and compaction of utilities page 02220 city of lynchburg, va manual of specifications and standard details december 2016 2 trench depth.
Mark, identify, or barricade other obstructions handling heavy objects observe proper lifting techniques. Introduction to fill and backfill for structures cedengineering. The area surrounding meter boxes shall be backfilled with backfill material. If an inplace density test indicates insufficient compaction, the contractor shall recompact the area in question until the backfill is compacted to the requirements set forth in paragraph 4. These specifications are cited as fp14 indicating federal project.
In 2019 a ludlow will install the 16 di water main on rt 17 all the way to maiden lane. The first step in the construction process is the application for the a building permit, then is all plans and details are submitted to the building department where. If granular backfill is specified for other applications, place and compact as specified for those applications. Proper backfilling and grading for a dry foundation. Submit submittal packages in accordance with standard specification section 00. Fields and open country the backfill above a point 2 feet above the top of the.
Excavate for placement and construction of structures and backfill structures. When, during the progress of the work, any excavation is to be made in county easements through private property, the contractor shall notify the property. Of course, like ordinary backfill, select backfill must be free of lumps and. Correct measurement of excavation and backfilling is required because excavation cost is major part of the foundation construction. Backfill shall be free from discarded construction material and debris. Backfill material placed around culverts, abutment wingwalls and piers shall be deposited on both sides to approximately the same elevation at the same time. Any use of district water for construction purposes must be from a hydrant or other. Following are the sequence of works for excavation and backfilling of soil. Free access must be provided at all times to fire hydrants. Backfilling to a depth of one foot maximum over the crown of the pipe shall be made with granular soil or sand as required by the douglas county engineer or his field representative. Pipe installation and backfilling shall be completed before the start of subbase and base course construction over the pipe location. The backfills are of different types which are used according to the requirement. City of fargo specifications excavation, trenching, and backfilling for underground work part 1 description of work the terms excavation and trenching, either individually or collectively, as used in these specifications and other contract documents shall refer to and shall mean all material excavated or. Site preparation, excavation, and backfill specification may 2014 process industry practices page 5 of 18.
The construction site shall be cleared of all obstructions and. Unauthorized excavation or backfill to replace it shall not be a pay item. You may copy this method statement and submit to the engineer but please take a while to read your specification first as this may differ from it and revision will be needed. Furnishing, placing and use of sheeting, shoring, and sheet piling necessary in excavating for and protecting the work and workmen.
Another ludlow crew will work on installing the water main up talcott ridge dr. The construction representative or engineer may order as many in place density tests as he deems necessary to insure proper compaction. Backfilling is the process of putting the soil back into a trench or foundation once excavation, and the related work has been completed. Construction material for backfilling the embedment is to be coarsebodied soil up to a coarseness of 20 mm. In construction, this is a significant part of the building process. If an in place density test indicates insufficient compaction, the contractor shall recompact the area in question until the backfill is compacted to the requirements set forth in paragraph 4. Backfill definition of backfill by the free dictionary. In construction, backfill replaces soil that is removed during building construction, and it is used to strengthen and support a structures foundation. All trenches or excavations shall be backfilled to the original surface of the ground or such other grades as shown or directed.
This site is made for educational purpose so as to help the fellow civil engineering students and field engineers to spread the knowledge about the latest civil engineering projects, qs, land surveying, qaqc civil engineering and softwares. Native backfill material shall be select excavated native material free from roots or other. Backfilling excavations with cementbound granular material shall be used for filling excavations as shown on design drawing or as agreed by engineer. All trenches shall be kept free from water during excavation, fine grading, pipe. Site preparation, excavation, and backfill specification. Excavation, backfilling, and compaction of backfill for structures.
Types of backfilling materials used in building construction. Remedial construction activities will consist of mobilization to the jobsite, site preparations, clearing and grubbing, removal, disposal andor storage of above ground items, excavation, transportation and disposal of impacted fill material, backfilling of areas of excavation, utility relocationreplacement, restoration and demobilization. Almost all types of building sites and construction projects. The work of making all necessary excavations for the construction of all contract work. The material is required to contain no more than 10 % passing. Backfilling techniques and materials in underground. The strength or stability of the soil may be increased by lowering the water table and the degree of saturation of the soil.
The manner of placing and the degree of compaction shall be as specified hereinafter. Different types of backfills course grained soil coarsegrained soils include gravelly and sandy soils and range types of backfilling. Backfilling excavations for frost heave or other unstable materials. Sand, gravel, crushed stone, air cooled blast furnace slag, granulated blast furnace slag, or other approved materials are used for b borrow. These points must be kept in mind to take necessary action during excavation and backfilling. Compacting of embedment, bedding, cover, and backfill materials during pipe installation shall be according to opss 501. Backfilling will commence only after completion of inspection and test of below grade structures is complete. Method statement for excavation compaction and backfilling. Backfilling shall commence using similar excavated material. All trenches shall be excavated to accommodate the bedding as required in table 2220. Soil compaction is defined as the method of mechanically increasing the density of soil. In construction, backfilling is the process of replacing or reusing the soil that is removed during building construction to strengthen and support a structures foundation or any other structural member. As regards the material for the main backfill, it can be assumed that in many cases, the ground removed in excavating the trench has been used again so. Jan 22, 2014 at the start of the project, in most projects i joined with, one of the activities shall be implemented or started first is excavation.
Filling marsh areas associated with marsh excavation. Backfill material shall be free from organic material and conform to one of the. In construction, backfilling is the process of replacing or reusing the soil that is removed during building construction to what is backfilling. The high contact pressures caused by construction operations on an unstable soil. Backfilling activities will commence as soon as the fully completed section of the retaining wall is ready to received backfill material and also practically safe for the other ongoing construction activities for remaining retaining wall structure. Clearing, grubbing, and tree removal sites that are to be occupied by permanent construction or which are to be excavated and graded shall be cleared and grubbed of all stumps, trees, logs, brush and other vegetation and debris as. Backfill shall be free from rocks, broken concrete and frozen chunks until the pipe is covered by not less than 12 inches 305 mm of tamped earth. Backfill material shall be clean and free from all organic.
Method statement for excavation works quality assurance. Backfill construction follow these requirements when backfilling. The underground construction industry will find these guidelines useful for minimizing misunderstandings related to backfilling and contact grouting terms and methods. Free structured method statement for backfilling and. Keep excavated areas free of water while work is in progress. Aua guidelines for backfilling and contact grouting of. After the construction site has been staked, foundations on which the structures will. Native backfill is defined as granular soil excavated from a trench and it shall be free of ice, clay, debris and excessive organic matter. This backfill should be properly compacted with a cap layer that will shed bulk water away from the foundation. Backfilling techniques and materials in underground excavations. In general, the backfilling shall be carried along as speedily as possible and as soon as the concrete, mortar, masonry andor other work have sufficient strength to resist the imposed load without damage. The cementbound granular material shall consist of crushed, hard, clean, durable rock or washed sand or a combination thereof.
Structural fill or backfill placed beneath footings, grade beams, mat foundations, or any settlement sensitive structures shall be compacted to at least 95 percent of the maximum dry density as determined by astm d 1557. Pipe installation and backfilling should be completed before the start of subbase and base course construction. The backfill process requires skills and heavy equipment as well as knowledge of the specifications, contract requirements, and soil conditions. Item 401, flowable backfill item 421, hydraulic cement concrete. Cfatn002 these can be on either the inside or outside of the wall and should be cast integrally with the wall. Backfill areas of unauthorized excavation with the type material necessary earth, rock or concrete to insure the stability of the structure of construction involved. Any backfilling operation has to comply with the recovery definition by replacing other materials or being prepared to fulfil a particular function. This concept is similar to the use of piers in masonry construction. Backfilling will be carried out by following the norms as set out hereunder column. Imethod statementsswamp weight of dump truck containing the excavated material will not be exceeded the limited weight allowed by the nation, local, traffic law. Use materials that meet the requirements of the following items.
Care shall be taken to remove bolder, vegetations and any other deleterious materials. Compact with a 1,000pound compactor, or as appropriate. The term backfilling is newly introduced into the wfd and it is explicitly accepted by article 112 lit. Ponding or flooding water is added after soil is placed and until free water stands. This code deal with excavation and backfilling of earth and in specific their measurement. Submit a report from a testing laboratory verifying that imported material is asbestos free and conforms to the specified gradations or characteristics. If performed improperly, settlement of the soil could occur and result in unnecessary maintenance costs or structure failure. Backfill in layers of 4 to 6 inches, using nonorganic fill material that is free of debris. The construction representative or engineer may order as many inplace density tests as he deems necessary to insure proper compaction. The biggest civil engineering portal on the internet. Code of practises to be followed or method statement will be provided for execution purpose to site engineer normally by client which is usually a d. Method statement for excavation works quality assurance and. Mar 28, 2017 when it comes to backfilling, free draining backfill thats free of any construction debris will relieve hydrostatic pressure on the foundation walls, minimizing the burden on your foundation waterproofing. Performing all pumping and work necessary to keep the trenches free from water.
Backfilling definition of backfilling by the free dictionary. Native backfill soil shall not consist of expansive clay. Excavation and backfilling of soil is a very important part of construction process, and care must be taken while excavation in safety perspective. Construction staking shall be performed with qualified, competent personnel under the direction of a professional land surveyor registered in the state of colorado. Item 401, flowable backfill item 421, hydraulic cement concrete dms4600, hydraulic cement 400. General backfilling is a part of the work of excavation, except as noted. Techniques for backfilling utility trenches the balance small. Work leading up to the selection of appropriate disposal concepts and means of achieving safe disposal of spent nuclear fuel has involved examination of a wide range. Excavation and backfilling of soil work sequence and. Different soil layers may be encountered while excavation, dewatering may be needed sometimes. This section includes grading, excavation trenching, dewatering and backfilling. As regards the material for the main backfill, it can be assumed that in many cases, the ground removed in excavating the trench has been used again so that nearly all types of soil can be found in this region. Before allowing the movement of any construction equipment or vehicular traffic over the buried.
Method statement for excavation and backfilling for underground services. American states utility services 31 20 00 1 excavation, trenching and backfilling revision date. The contractor shall furnish, install, and leave in place, construction sheeting and bracing when specified or when indicated or shown on the drawings. Mechanical backfilling will be permitted providing material being placed with dragline or crane has a free fall of not greater than one foot from the bucket. All survey notes and construction staking notes shall be entered into bound, hard cover field books. Accurately recorded asbuilt locations of projectinstalled underground utilities.
Guidance on the interpretation of the term backfilling from reference year 2010 onwards statistics on waste treatment according to the regulation on waste statistics 21502002ec covers the treatment category backfilling. Backfilling and compacting operation for construction and. Place the backfill in layers not exceeding 1 ft 300 mm of loose material. Backfill shall be placed evenly on both sides of the pipe and tamped to retain proper alignment. Backfill shall be placed evenly on both sides of the pipe and tamped to. Pdf method statement for excavation and backfilling for.
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