土木工程專業(yè)外文翻譯---現(xiàn)澆樓板裂縫的產(chǎn)生與防治-建筑結(jié)構(gòu)-文庫吧
2025-04-17 14:17 本頁面
【正文】 ng up fragment of brick , mortar , template ,etc.. Premature adding and is carried on one39。s shoulder or back, has caused the crack of castinplace board artificially. 3, the crack which the temperature change causes. As everybody knows, the cement condenses and hardens fast at room temperature, the characteristic such as being great of heat of hydration, especially in summer, after the concrete is built, the release amount of the heat of hydration is great, the concrete is under the high temperature, can39。t get and water maintenance in time , and desiccate and shrink, make concrete take place dry to split , result in fracturing finally. Investigation find in the majority board corner crack in , tan by the sun towards the front directly the sun. 4, the house is crossed too long to set up the essential expansion joint , is the reason which causes the crack too. The developer is in order to save the land, often take the length of the house into account , make the house whole too long, set up expansion joint either, because of lack essential expansion joint, freedom flexible degree in house reach or exceed should set up interval that expansion joint require , will present the crack too. 5, the board is defeated by the muscle and sunk in the crack produced . In the course of constructing, because constructors operate barbarously, trample the reinforcing bar arbitrarily , cause and shoulder the muscle and sink, the antiabrasion layer is too big, reduce the sectional effective height of the board, make the bearing capacity of the board unable to reach the requirement of ones that design, thus cause the production of the crack of board. Effective height, make the bearing capacity of the board unable to reach the requirement of ones that design, thus cause the production of the crack of board. How to prevent and cure the production of the board crack of castinplace board, according to the construction experience for many years, offer some following prevention measures, suitable for consulting : 1, Do well castinplace board maintain , work , guarantee concrete intensity , prevent and cure important link that crack produce one of conscientiously. The norm stipulates , must cover and keep maintenance warm in 12 hours after the concrete is built at room temperature, ordinary cement is no less than 7 days, if the one that ignored to concrete watered maintenance, on one hand it reduce concrete intensity, on the other hand it make concrete to be in the course of hardening too late to supplement the moisture, therefore lack water and produce the crack in a large amount. So do a good job of watering maintenance of concrete , can already reduce the crack that temperature produces , can also reduce the crack that the concrete shrink and produce . 2, castinplace board don39。t pass morning people , pile material , He Shi load , because concrete have a sclerosis course build , just have intensity。 In this course , should maintain the concrete , can39。t exert any external force to the concrete . In a situation that the concrete has not had certain intensity yet , concentrate on , pile up c
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