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Home Construction Basics Bar Splice, Hook and Bend
Home Construction Basics Bar Splice, Hook and Bend
| Bar Splice, Hook and Bend |
| Saturday, 12 April 2008 08:20 | ||||||
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How to determine bar splicing length Types of reinforcement - Minimum splice length:
To those who have not yet been exposed to detail drafting work nor actual field construction of reinforced concrete will find it difficult to make a detailed estimates of the various reinforcement required. The difficulties lies not on the ability of the estimator to compute but his lack of familiarization with the different types of reinforcement for footings, columns, beam and slab etc. The various parts of reinforcement that an estimator should be familiarized with are: A. Concrete hollow Block Reinforcement. Is the simples type of vertical and horizontal reinforcement placed in between the cells and layers of the blocks respectively. This type of reinforcement is installed and spliced progressively with the rise of the concrete blocks. B. Footing Reinforcement comprises of the following: 1. Footing slab reinforcement for small and medium size footings. 2. Beam reinforcement for large foundations. 3. Dowels, cut and bend bars. C. Post and Column Reinforcement comprises of the following: 1. Main vertical reinforcement a. Single b. Bundled bars 2. Lateral Ties a. Outer ties b. Inner ties c. Straight ties 3. Spiral ties for circular column 4. Dowels for partitions and other future attachments D. Beam and Girder Reinforcements 1. Main reinforcements a. Straight bars b. Bend bars c. Additional cut bars for tension and compression 2. Stirrups a. Open stirrups b. Closed stirrups 3. Cut bars a. Over and across the support b. Between supports c. Dowels and hangers for ceiling and partitions E. Floor Slab Reinforcement 1. Main reinforcements a. Straight main reinforcing bars extending from one beam to the other. b. Alternate main reinforcing bars with bend between and over the beam support. c. Main alternate bars over support. 2. Temperature bars tied perpendicular to the main reinforcements. 3. Cut additional alternate bars over support (beam). 4. Dowels and hangers for ceiling and other attachment. F. Other Types and Form of Reinforcements designed for a particular structures. Not until after familiarizing with these different parts and types of reinforcement could one make a sound and reliable estimates. Suggested procedures in estimating steel bar reinforcement: 1. The main reinforcement for post, columns, beams, girders and the like structures are determined by the simple Direct Counting method. That is, by counting the number of main vertical reinforcement on one structure then multiplied by the total number of the same category in the plan. 2. Do not forget the additional length for hook, bend and splices for end lapping bars. These additional length is the one of the most often overlooked in ordering length of steel bars. Thus, in ordering steel bars, the cardinal rule is to minimize splicing if it cannot be totally avoided. 3. For other reinforcement parts such as lateral ties, stirrups, spirals, dowels, cut bars and the like should be treated separately one at a time. However, always remember that the cut must include the provision for hook, bend and splice length. 4. After knowing the length of the lateral ties, stirrups and other similar parts, select the steel bars from the various commercial length from 6.00 to 13.50 meters long where these cut bars will be taken without extra cuts. Extra cuts are waste when classified as junk materials. 5. Considering its cost, tie wire for reinforcement joints and intersections is a big item of large construction work. The length of each tie wire should be cut to the minimum required length based on the diameter of the bars. Indiscriminate cutting of tie wire should not be allowed.
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