The raft foundation is a very commonly used type of foundation system. Dont forget that your raft foundation shall be checked for Combined bi-axial eccentricity. Raft foundation is also known as Mat foundation. The raft supports a heavy industrial equipment support structure. If you are designing pile caps then you will need joints between the pile caps and the raft. The quantity of reinforcement … Such trenches also required for different utility lines. Example: Tied, tongue and groove, hand-tooled, longitu-dinal pavement construction joint. The … Contractor has asked if they can use a horizontal construction joint in the raft. ISSUES IN THE CHOICE AND CONSTRUCTION OF RAFT FOUNDATION BY Engr. The most important thing is that it reduces seepage of water from surface to underneath stratum. In case of construction of ribs for raft foundation, it is required to provide trenches, cohesive properties of fill materials facilitate us to minimize requirement of formwork. The foundation of Hongyun building B tower is made of raft board foundation which is 3300mm in the thickness include four kinds of reinforcement Φ32, Φ28, Φ12 and 12 steel grade two, in respective. They were toying around with the idea of pouring the first 3m below the lift pits, form the lift pits and pour the 2.4m thickness the next day or two. There is a raft 3m thick, with 2.4m deep lift pits, creating a 5.4m section in some areas. 2. How is a construction joint in the raft slab done? The CG shall not be, in any event, greater than 1/3 of the mid-span. But across construction joints or contraction joints in slabs that will have heavier loads, we need a way to keep the slabs vertically aligned as the traffic crosses. First of all you need to identify the location of the construction joint, for raft foundations, ACI 224.3 explains that the “Desirable locations for joints placed perpendicular to the main reinforcement are … Chiazo C. Ifeobu, MBA, MNSE INTRODUCTION A raft foundation, as applied to building construction, provides a continuous reinforced concrete slab under the entire or a substantial part of the building. Abbas and Sultan [16] investigated the influence of construction joint on the strength and behavior of one-way slabs. If you are talking about an expansion joint, then the answer is NO. You may have construction joints, but these should be detailed so the slab is continuous. PROCEDURE.1 In some cases CLIENT shall have to prepare shop drawings proposing location and type of construction joints and obtain approval from … The familiar term, “ control joint,” is not included in this list of joint terminology, since it does not have a unique and universal meaning. Best Answers. : Construction, contraction, expansion, isolation, hinge. We have designed a raft foundation with dimensions 64ft x 36 ft x 4.5 ft thick. This facility is located in a high seismic zone (UBC Zone 3+). SCOPE The scope of this procedure outlines methods to be used for constructing effective and durable construction joints in accordance with the contract specifications. CONSTRUCTION JOINTS IN IN-SITU CONCRETE METHOD STATEMENT. A raft foundation is often used when the soil is weak, as it distributes the weight of the building over the entire area of the building, and not over smaller zones (like individual footings) or at individual points (like pile foundations).This reduces the stress on the soil. Definition of raft foundation along with working principle, when to choose raft, types of raft foundation, materials of raft foundation, raft construction steps etc are discussed below. Many people involved with construction Recently I was having a discussion with a contractor on horizontal cold joints in a raft foundation. 1. Contraction joints are not used in mat foundations. Sawcuts are for ground supported slabs, but a mat foundation is a structural slab.
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