During marine construction, dredging is often required in support of construction of piers, bridges and tunnels. A dredge is equipped with a submersible pump that relies on suction to excavate the. Method of measurement for road works preparation of bill. When a contractor is asked to prepare a tender he is supplied with all the contract documents. Priced contract with bill of quantities designing buildings wiki share your construction industry knowledge. The majority of tenders for dredging works incorporate a bill of quantities. Hydraulic fill manual for dredging and reclamation workseditors, jan van t hoff, van t hoff consultancy b. Item description quantity unit rate nu amount in figure in words c1 providing and laying in position plain cement concrete excluding the cost of centering and. The key to the success of the use of bills of quantities is a clear understanding by all parties to the contract of what is included, or excluded, in the measurement.
Difficult accessible places in harbors small quantities with strongly varying depth. Boq shall be read and construed in conjunction with other contract documents. Jul 31, 2015 bill of quantities has not included an element to price specifically for the roof. A common question for those new to nec and especially those tendering for the first time under option b. Proposed construction of laboratory block for shimoni mariculture development project phase i issued by director public works transport, infrastructure and public works p. Preparation of bill of quantities tii publications.
Works, afforestation works, main channel revetment works, end of county water storage section qingzhanghe bridge, general provisions and which in the bill of quantities. Youll need this to get an accurate quote for your construction project. Neighborhood dredging program, but that the selected method be chosen based on engineering and economics for each specific project, rather than mandated through policy. Engineering projects india limited a government of india enterprise bill of quantities dsr amount rs item no.
Shifting sands the first thing that strikes you about this contract is its brevity. Experience of having successfully completed works on hand of. Pdf form of contract for dredging and reclamation works. In terms of the rainbow suite this is known as the turquoise book.
Similar works means dredging the soilhard material involving with at least 25% rock quantity in the total dredged volume shall be dredged by value or. The name of the tender and the number and identification of its constituent lots are stated in the tds. Bw may be willing to work on the survey data and print it out. A bill of quantities boq is a document used in tendering in the construction industry in which materials, parts, and labour and their costs are itemised. Riicwm504a prepare civil works bill of quantities modification history not applicable. Create a spreadsheet for your bill of quantities with columns for the item numbers, descriptions, units of measurement, quantities, rates for each item, labor, and total cost. General scope a primary use of hydrographic surveys supporting river and harbor construction is to determine the quantity of material that is excavated or placed.
During the process of dredging, a dredge is used to remove muck and mud from the bottom or side of a body of water. Dislocating existing installations prior to commencement of any of the bridge demolition works. This paper will present an estimate which uses a manual estimating method. This phase 1 dredging construction quality controlquality assurance plan dqap has been developed in accordance with section 2. These material quantity estimates are used for designbidding purposes and contracted construction payment. Preliminaries documents clause 2 the bill of quantities is compiled in accordance with the method described in the standard system for measuring small buildings. A dredging and reclamation works instructions to tenderers tender forms of contract agreement and bond conditions of contract. A bill of quantities is a document which lists all the items necessary for the complete construction of works. It is essential to look into how variations should be.
Estimating software specifically geared towards dredging is often used for preparation of dredge estimates. The contract comprises of the construction and completion of all works described in the specifications, drawings and bill of quantities and to supply all necessary labor, plant and temporary works to complete the described works together with such materials as are required by the specifications. These bills of quantities are supplied as part of the contract for the proposed library for karatina. Measurements in the event of any discrepancies arising between the bills of quantities and the actual works, the site measurements shall generally take precedence. Dekilane phuntsholing page 2 of boq for ricbl, pling civil ref. Dredging should be measured in lengths of canal as shown in the bill of quantities. The measurement of quantities allows the total price to be analyzed in great detail, thus providing cost feedback on the job, which in turn can be used statistically in cost planning other work. However, such discrepancies between any contract documents shall immediately be referred to the project manager in accordance with clause 22 of. Beadon creek maritime facility, capital dredging environmental impact assessment. Dredging quantities are often calculated by individuals other than the cost estimator. Tender for dredging at the plymouth jetty january 2016.
Som e equipment is designed for dry soil, while others operate under water. Fidic form of contract for dredging and reclamation works 2006, 2016, also known as the fidic blue book figure 1, defines variation as a change to the specification valuing variations in dredging contracts david kinlan above. Unit descriptor this unit covers the preparation of civil works bills of quantities in civil construction. As with all fidic forms listed, the aim has been to. It helps trouble free execution of the works if no unforeseen conditions appear, and helps solving discussions and disputes in case such unforeseen contract conditions do appear. The large grab dredgers are used for bulk dredging. The use of bills of quantities is a wellestablished means of enabling the financial control and management of building works. Volume 3 section 1 chapter iii method of measurement for road works preparation of bill of quantities march 2011 3 preambles to bill of 9 the matters set out under the heading preambles to bill of quantities quantities 117 hereafter are always to be included as a preamble to the bill of quantities. The quantities are defined as estimated because they are subject to admeasurement and are not expected to be totally accurate due to the unknown factors which occur in civil engineering work. The pace of project award as well as implementation is slow. Pdf dredging processes, the loading process of a trailing. Description unit qty unit rate amount 1 preliminaries a allow for a temporary site office adequate to accomondate six persons,notice board, shelves and, store for materials and tools storage. Importance and functions of bills of quantities in the. Earlier this year, fidic produced a standard form of contract for dredging and reclamation works.
Boq for road works 1 of 20 signature of contractor and seal. Nec was first published in 1993 as the new engineering contract. Therefore we are a great partner to assist during contract preparation or subsequent stages of dredging or marine works when it comes down to contracts or related commercial aspects. During the prefeasibility stage the consultant setup a preliminary unit cost data base and carried out the cost estimates for. For dredging and reclamation works crc press book without proper hydraulic fill and suitable specialised equipment, many major infrastructure projects such as ports, airports, roads, industrial or housing projects could not be realised. Pdf historically, the formal form of bills of quantities was introduced in the. The tenderer should have, in the last seven years ending on 310309, successfully completed the civil construction including services and finishing works of highrise buildings or multistorey apartments townships or other high rise commercial establishments. The payment would be made for relevant items of bill of quantities as. Why we dredge dredging for navigation many of these channels have later required maintenance dredging, i. The key to the success of the use of bills of quantities is a clear. Chapter 5 estimating work items costs, idirect costs, markup and contract pricing the cost of labor, material and equipment expended on the items that were measured in the quantity takeoffs is usually referred to as the direct costs of the work. A bill of quantities which in essence is no more than a price list of the permanent works no longer adequately re.
Contracts and conditions in dredging dredging and marine. Dredging in india mission zthe indian dredging industry is facing challenging times. Em dredging and dredged material disposal em beneficial uses of dredged material em confined disposal of dredged material technical framework for environmental evaluations ocean testing manual inland testing manual evaluation of dredged material proposed for disposal at island, nearshore, or upland confined. Item 1 b allow for clean water for the works item 1. Dredge measurement and payment volume computations 151. Bill of quantities work section plot 6 summary bill no. Along quay walls where the soil is spoiled by wires and debris borrowing sand and gravel in deep pits etc. This is the most costly part of the dredging operation but generally presents fewer headaches, and the sight of a lorry load of silt disappearing from your waterway is hard to beat. Typically, the contractor under blue book rules constructs the works in accordance with the employeesdesign. Private dredging contractors are finding it difficult to sustain operations. Electrical installation works pvcswapvc copper cables per meter a a 25mm sq. It includes planning for the civil works bills of quantities process, identifying and calculating. Atkinson december 2000 nature of bills bills of quantities comprise a list of items of work which are briefly described. Along quay walls where the soil is spoiled by wires and debris borrowing sand and gravel in deep pits.
Prior to the introduction of this form those wishing to place dredging contracts would have. Priced contract with bills of quantities of the engineering and construction contract ecc is what happens under the contract if something is missing in the bill of quantities but is clearly indicated on one of the tender drawings within the works information. Contracts management and administration based on fidic. Bills of quantities bq is one of systematic ways applied in the construction industry in which its primary function is to record items of works for tendering purposes and to create a fair. Esuk2 web sample 2 01 enabling works 01 enabling works ref description quantity units rate value enabling works existing site, buildings, services c90. Pdf importance and functions of bills of quantities in.
The bills also provide a measure of the extent of work and this allows the work to be priced. In some cases, dredging may be the most viable remediation option when eutrophication occurs. Mechanical dredging is thought to be the best method, in general, for neighborhood work in the. Maintenance dredging consists of the removal of sedimentation to maintain the required depth of waterways, channels and ports. Any measurement for execution and payment of the works, including the provision of. The contract comprises of the construction and completion of all works described in the specifications, drawings and bill of quantities and to. Works information or bills of quantities under nec. Dredging can be done to recover materials of commercial value. The principal quantities contain carrying out river dredging and ecological control of levee engineering for qingzhangxiyuan urban section. The derived quantities are then summarized in the bill of quantities and subsequently, manually entered in the estimated construction cost spreadsheet which are multiplied by the unit prices to come up with total cost of that item and summed up all the pay items to calculate the total direct cost. Blue pelican associates has extensive experience in the different forms of contracts and conditions which can be used for dredging and marine works. Chapter 15 dredge measurement and payment volume computations.
Dredging to remove hazardous material pcbs from the hudson river the chesapeake bay bridge tunnel project required extensive dredging for the laying of the tunnel sections. Total tender for dredging at the plymouth jetty bill of. Principal building agreement agreement definitions a1 definitions and interpretation clause 1. A list of the principal components of the works with their approximate estimatedquantities quantities shall be given solely to assist tenderers in making a rapid assessment of the general scale and character of the proposed works prior to the examination of the remainder of the bill of quantities and the other contractual documents on which. Riicwm504a prepare civil works bill of quantities date this document was generated. While the smaller ones are mostly used for special jobs, such as. Pdf the impact of dredging works in coastal waters. Preparation of bill of quantities table 4 this table 4 is an example of the introduction and index to be inserted as a separate page immediately preceding the separate bills of quantities included within the bill for structures where a choice of designs is. The works, materials or activities listed in the following shall always be considered as supportive works to be included in the unit prices bid for any item in the bill of quantities. A bill of quantities is a list of the total materials required to complete a construction project. It is a suite of construction contracts intended to promote partnering and collaboration between the contractor and client. Item description unit of measure quantity of works unit price usd total construction works preparatory works 1.
Include for temporary works needed to aid lump sum the dredging operation. Drawings and bill of quantities and to supply all necessary labor, plant and temporary works to complete the described works. Managing a dredging contract inland waterways association. A the bill of quantities has been measured in accordance with the australian standard method of measurement of building works, fifth edition 1990 ed and published by the australian institute of quantity surveyors and the master builders construction and housing association australia inc.