METHOD FOR BLASTING CONCRETE SKELETON THROUGH CONTROL OF CRACKING

• Main Authors: NAKAMORI JUNICHIRO, YAMAJI HIROSHI
• Format: Patent
• Language: English; Japanese
• Published: 17.05.2018
• Subjects: AMMUNITION; BLASTING; BUILDING; BUILDING IMPLEMENTS OR OTHER BUILDING AIDS, OR THEIRUSE; FIXED CONSTRUCTIONS; FORMS; HANDLING BUILDING MATERIALS ON THE SITE; HEATING; LIGHTING; MECHANICAL ENGINEERING; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTINGBUILDINGS; SCAFFOLDING; SHUTTERING; WEAPONS

PROBLEM TO BE SOLVED: To provide a method capable of blasting partially a concrete skeleton through control of cracking with good operation efficiency at low cost.SOLUTION: A plurality of detonation holes (5) and a plurality of holes (6) are drilled in a concrete skeleton (1). Each of the plurality of the detonation holes (5) is formed at an equal interval apart from each other along an array (7) of the detonation holes. Each of the plurality of the holes is formed along an array (8) of the holes parallel to the array of the detonation holes. A distance (a) between the array of the detonation holes and the array of the holes is 1/6 to 2/3 times larger than a distance (b) between the detonation holes adjacent each other, and each of the plurality of the holes is formed one in the two ranges forming at an angle (θ) between 40° -50° toward to the array of the holes in. When explosive (4) is loaded in each of the plurality of the detonation holes, all of which are detonated simultaneously, it is possible to prevent an occurrence of cracking in a region (A) on the side opposite to the array of the detonation hoes with respect to the array of the holes.SELECTED DRAWING: Figure 1 【課題】良好な作業効率かつ低コストで、ひび割れを制御してコンクリート躯体を部分的に爆破することのできる方法を提供する。【解決手段】コンクリート躯体（１）に複数の起爆孔（５）と複数の空孔（６）を削孔する。起爆孔（５）は起爆孔列（７）に沿って、互いに等間隔に形成される。空孔は、起爆孔列に平行な空孔列（８）に沿って形成される。起爆孔列と空孔列との間の距離（ａ）は、互いに隣接する起爆孔間の距離（ｂ）の１／６〜２／３倍であり、空孔は、起爆孔の各々から、起爆孔列に沿った向きの双方に対して空孔列に向けて４０°〜５０°の角度（θ）をなす２つの範囲に１つずつ形成される。起爆孔に爆薬（４）を装填し、同時に爆破すると、空孔列に対して起爆孔列とは反対側の領域（Ａ）にひび割れが生じることを回避できる。【選択図】図１