{"id":2812,"date":"2026-02-27T16:14:28","date_gmt":"2026-02-27T12:44:28","guid":{"rendered":"https:\/\/khamootgostar.com\/rebar-installation-in-construction\/"},"modified":"2026-05-12T12:14:24","modified_gmt":"2026-05-12T08:44:24","slug":"rebar-installation-in-construction","status":"publish","type":"post","link":"https:\/\/khamootgostar.com\/en\/rebar-installation-in-construction\/","title":{"rendered":"Rebar Installation in Construction"},"content":{"rendered":"<p data-path-to-node=\"0\"><strong>Definition of Rebar and Its Various Forms in Concrete<\/strong><\/p>\n<p data-path-to-node=\"1\">Rebar (short for reinforcing bar) installation in buildings, also known as reinforcement, refers to steel placed inside concrete to compensate for its low tensile strength. This type of steel, used in reinforced concrete structures, is in the form of wire or bars. <b data-path-to-node=\"1\" data-index-in-node=\"265\">Stirrups<\/b> (Kh\u00e2mout) are transverse reinforcements tied around longitudinal and main bars in footings and beams to resist shear and torsion forces. Additionally, rebars arranged in a grid or coil to resist applied forces are referred to as <b data-path-to-node=\"1\" data-index-in-node=\"503\">Mat<\/b> or <b data-path-to-node=\"1\" data-index-in-node=\"510\">Mesh<\/b> (Hassiri).<\/p>\n<p data-path-to-node=\"2\"><strong>Definition of Reinforcement Work (Armatour-Bandi)<\/strong><\/p>\n<p data-path-to-node=\"3\">Reinforcement work refers to the arrangement and placement of rebars inside the concrete and is considered one of the most critical and sensitive executive points in concrete structures. Since all tensile forces in concrete structures are borne by the reinforcement, extreme precision is required during execution. This process requires specialized workers and supervisory engineers. Supervisory engineers are responsible for direct and continuous oversight from the foundation reinforcement stage until the completion of concrete pouring.<\/p>\n<p data-path-to-node=\"4\"><strong>Key Points in Reinforcement Work<\/strong><\/p>\n<ul data-path-to-node=\"5\">\n<li>\n<p data-path-to-node=\"5,0,0\">The distance between stirrups should be <b data-path-to-node=\"5,0,0\" data-index-in-node=\"40\">20 cm<\/b> (approximately one hand span).<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"5,1,0\">Stirrups are secured to longitudinal rebars using tie wires.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"5,2,0\">Rebar cutting must be performed using <b data-path-to-node=\"5,2,0\" data-index-in-node=\"38\">specialized rebar cutters<\/b>; the use of oxy-fuel (blowtorch) cutting should be avoided.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"5,3,0\">Rusted rebars or those coated in oil must not be used; any surface contamination must be cleaned before installation.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"5,4,0\">Rebars should not be bent at temperatures below <b data-path-to-node=\"5,4,0\" data-index-in-node=\"48\">5\u00b0C<\/b>. Bending must be done cold using mechanical devices.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"5,5,0\">The distance between the rebars and the formwork surface (concrete cover) must be at least <b data-path-to-node=\"5,5,0\" data-index-in-node=\"91\">2.5 cm<\/b> to ensure proper protection.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"5,6,0\">Stirrups are responsible for holding longitudinal bars and preventing them from buckling under tension; therefore, stirrup placement regulations must be strictly followed.<\/p>\n<\/li>\n<\/ul>\n<p data-path-to-node=\"6\"><strong>Principles and Regulations for Bending Rebars<\/strong><\/p>\n<p data-path-to-node=\"7\">To maintain mechanical properties and expected strength, the following principles must be observed:<\/p>\n<ul data-path-to-node=\"8\">\n<li>\n<p data-path-to-node=\"8,0,0\">Hammering is not permitted for bending rebars.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"8,1,0\">The minimum diameter of the bending mandrel must be selected according to the steel type.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"8,2,0\">Unbending and rebending for reshaping is not allowed.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"8,3,0\">Bending speed should be chosen based on the steel type and ambient temperature.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"8,4,0\">Bending must be performed cold, and the bars must be completely straight before bending.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"8,5,0\">Rebars are bent by hand in small workshops and by machines in large-scale projects.<\/p>\n<\/li>\n<\/ul>\n<p data-path-to-node=\"9\"><strong>Types of Rebar Splices<\/strong><\/p>\n<p data-path-to-node=\"10\">The following methods are used to connect rebars:<\/p>\n<ol start=\"1\" data-path-to-node=\"11\">\n<li>\n<p data-path-to-node=\"11,0,0\"><b data-path-to-node=\"11,0,0\" data-index-in-node=\"0\">Welded Splices<\/b><\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"11,1,0\"><b data-path-to-node=\"11,1,0\" data-index-in-node=\"0\">Lap Splices<\/b><\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"11,2,0\"><b data-path-to-node=\"11,2,0\" data-index-in-node=\"0\">End-Bearing Splices<\/b><\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"11,3,0\"><b data-path-to-node=\"11,3,0\" data-index-in-node=\"0\">Mechanical Splices (Couplers)<\/b><\/p>\n<\/li>\n<\/ol>\n<p data-path-to-node=\"12\"><strong>Welded Splice:<\/strong><\/p>\n<p data-path-to-node=\"13\">Connecting two rebars via welding requires specific conditions. Two common methods include:<\/p>\n<ul data-path-to-node=\"14\">\n<li>\n<p data-path-to-node=\"14,0,0\">Electric Arc Welding (Fusion welding with electrodes).<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"14,1,0\">Resistance Butt Welding (Pressure welding).<\/p>\n<\/li>\n<\/ul>\n<p data-path-to-node=\"15\"><strong>Lap Splice:<\/strong><\/p>\n<p data-path-to-node=\"16\">The most common type of connection in concrete structures. According to the Iranian Concrete Code (ABA), the lap length is typically calculated as <b data-path-to-node=\"16\" data-index-in-node=\"147\">1.3 times the development length<\/b>. Full contact between the two rebars along the lap length must be ensured.<\/p>\n<p data-path-to-node=\"17\"><strong>Mechanical Splice:<\/strong><\/p>\n<p data-path-to-node=\"18\">Rebars are connected using <b data-path-to-node=\"18\" data-index-in-node=\"27\">couplers<\/b>. These components keep the rebars aligned without eccentricity. They are also much lighter than traditional lap splices.<\/p>\n<p data-path-to-node=\"19\"><strong>End-Bearing Splice:<\/strong><\/p>\n<p data-path-to-node=\"20\">The following regulations apply to end-bearing connections:<\/p>\n<ul data-path-to-node=\"21\">\n<li>\n<p data-path-to-node=\"21,0,0\">Permitted only for compression bars with a diameter of <b data-path-to-node=\"21,0,0\" data-index-in-node=\"55\">25 mm<\/b> or larger.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"21,1,0\">The two rebars must be cut perpendicular to their axes.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"21,2,0\">Permitted only in members with closed stirrups or spirals.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"21,3,0\">Staggering is required; using end-bearing splices for all bars in a single section is not allowed.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"21,4,0\">The ends must be smooth, with an angle deviation of no more than <b data-path-to-node=\"21,4,0\" data-index-in-node=\"65\">1.5 degrees<\/b> relative to the plane perpendicular to the axis.<\/p>\n<\/li>\n<\/ul>\n<p data-path-to-node=\"22\"><strong>Regulations for Splicing Rebars<\/strong><\/p>\n<ul data-path-to-node=\"23\">\n<li>\n<p data-path-to-node=\"23,0,0\">Splicing more than half of the rebars in a single section for members under flexure or combined flexure and compression is not permitted.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"23,1,0\">In sections under tension, a maximum of <b data-path-to-node=\"23,1,0\" data-index-in-node=\"40\">one-third<\/b> of the rebars can be spliced using lap splices.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"23,2,0\">Splicing bottom bars of flexural members at the mid-span and top bars at the supports (or near them) is not permitted.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"23,3,0\">Each splice must be spaced <b data-path-to-node=\"23,3,0\" data-index-in-node=\"27\">40 times the rebar diameter<\/b> away from the adjacent splice and should not be located in the same section.<\/p>\n<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Definition of Rebar and Its Various Forms in Concrete Rebar (short for reinforcing bar) installation in buildings, also known as reinforcement, refers to steel placed inside concrete to compensate for its low tensile strength. This type of steel, used in reinforced concrete structures, is in the form of wire or bars. Stirrups (Kh\u00e2mout) are transverse [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2790,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26],"tags":[],"class_list":["post-2812","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-articles"],"_links":{"self":[{"href":"https:\/\/khamootgostar.com\/en\/wp-json\/wp\/v2\/posts\/2812","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/khamootgostar.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/khamootgostar.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/khamootgostar.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/khamootgostar.com\/en\/wp-json\/wp\/v2\/comments?post=2812"}],"version-history":[{"count":2,"href":"https:\/\/khamootgostar.com\/en\/wp-json\/wp\/v2\/posts\/2812\/revisions"}],"predecessor-version":[{"id":3177,"href":"https:\/\/khamootgostar.com\/en\/wp-json\/wp\/v2\/posts\/2812\/revisions\/3177"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/khamootgostar.com\/en\/wp-json\/wp\/v2\/media\/2790"}],"wp:attachment":[{"href":"https:\/\/khamootgostar.com\/en\/wp-json\/wp\/v2\/media?parent=2812"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/khamootgostar.com\/en\/wp-json\/wp\/v2\/categories?post=2812"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/khamootgostar.com\/en\/wp-json\/wp\/v2\/tags?post=2812"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}