【正文】 ce costs, and is of great significance. Reinforced steel bars connecting technologies can be divided into two broad categories linking welding machinery and steel. There are six types of welding steel welding methods, and some apply to the prefabricated plant, and some apply to the construction site, some of both apply. There are three types of machinery monly used reinforcement linking method primarily applicable to the construction site. Ways has its own characteristics and different application, and in the continuous development and improvement. In actual production, should be based on specific conditions of work, working environment and technical requirements, the choice of suitable methods to achieve the best overall efficiency. steel mechanical link radial squeeze link Will be a steel sleeve in two sets to the highlyreinforced Department with superhigh pressure hydraulic equipment (squeeze tongs) along steel sleeve radial squeeze steel casing, in squeezing out tongs squeeze pressure role of a steel sleeve plasticity deformation closely integrated with reinforced through reinforced steel sleeve and Wang Liang39。 現(xiàn)澆板上過早施工，加荷引起的裂縫。開發(fā)商為了節(jié)省土地，往往不顧及房屋長度，使房屋整體過長，也不設置伸縮縫，由于缺少必要的伸縮縫，當房屋的自由伸縮度達到或超過應設置伸縮縫要求的間距時，也會出現(xiàn)裂縫。因此，必須做到在混凝土強度達到 ，才允許在其上踩踏或安裝模板及支架。針對現(xiàn)澆板裂縫多發(fā)生在板角這一現(xiàn)象，在板角四周增設Φ 8200mm，長度為 1800mm 左右的輻射筋，以此來滿足板角應力的需要，使現(xiàn)澆板產(chǎn)生裂縫的應力作用范圍與輻射筋相一致，從而有效地改觀和控制裂縫的產(chǎn)生。 鋼筋機械連接 徑向擠壓連接 將一個鋼套筒套在兩根帶肋鋼筋的端部，用超高壓液壓設備（擠壓鉗）沿鋼套筒徑向擠壓鋼套管，在擠壓鉗擠壓力作用下，鋼套筒產(chǎn)生塑性變形與鋼筋緊密結(jié)合，通過鋼套筒與鋼筋橫肋的咬合，將兩根鋼筋牢固連接在一起。 利用錐螺紋能承受拉、壓兩種作用力及自 鎖性、密封性好的原理，將鋼筋的連接端加工成錐螺紋，按規(guī)定的力矩值把鋼筋連接成一體的接頭。 適用范圍：適用于工業(yè)與民用建筑及一般構(gòu)筑物的混凝土結(jié)構(gòu)中，鋼筋直徑為Ф16 ～ 40mm 的 Ⅱ 、 Ⅲ 級豎向、斜向或水平鋼筋的現(xiàn)場連接施工。 操作簡便、施工速度快、節(jié)約能源和材料、綜合經(jīng)濟效益好，該方法已在工程中大量應用。因此，推廣應用先進的鋼筋連接技術(shù)，對于提高工程質(zhì)量、加快施工速度、提高勞動生產(chǎn)率、降低成本，具有十分重要的意義?，F(xiàn)澆板負筋按設計要求都放在板上面，有梁通過或隔斷時一般放置在梁鋼筋上面或與梁鋼筋綁扎在一起。在施工過程中，由于施工人員野蠻操作，任意踩踏鋼筋，致使負筋下陷，保護層過大，減少了板截面的有效高度，使板的承載能力達不到設計的要求，從而導致板裂縫的產(chǎn)生。但開發(fā)商為了搶時間，趕進度，在剛澆好的現(xiàn)澆板上或混凝土尚處在初凝和終凝階段，就任意踩踏，搬運材料，集中堆放磚塊、砂漿、模板等。 如某市一開發(fā)商共建 6 層樓住宅 16 幢，建筑面積約 10 萬平方米，磚混結(jié)構(gòu)，初裝修，一梯二戶用磚墻分隔，每層設有圈梁同樓板整澆，板厚 100mm，混凝土標號為 C20，房屋長約 8090m 之間，不設伸縮縫，底層為 車庫層，基礎(chǔ)采用 C20 鋼筋籠灌注樁。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。s establishing a turn of beam together building plank is togetherwhole to sprinkle, the plank thick 100 mms, concrete mark number is C20, house long about with 8090 ms, don39。s turn to plete work in October,2020, finishing construction acceptance, didn39。 In this course , should maintain the concrete , can39。于是，質(zhì)監(jiān)部門組織有關(guān) 單位，首先對房屋沉降量和傾斜度進行復查，結(jié)果都在允許范圍內(nèi)，再查看施工圖紙也符合有關(guān)規(guī)范要求。大家知道，水泥在常溫下具有凝結(jié)硬化快，水化熱大等特點，尤其在夏天，混凝土澆筑后，水化熱釋放量大，混凝土在高溫下，得不到及時澆水養(yǎng)護，而失水收縮，使混凝土發(fā)生干裂，最終導致開裂。所以做好混凝土的澆水養(yǎng)護，既可減少溫度產(chǎn)生的裂縫，也可降低混凝土收縮而產(chǎn)生的裂縫。現(xiàn)澆板應選用中粗砂，粒徑在 之間的石子，砂石含泥量均不得超過 1％。鋼筋機械連接常用有 3 種方法，主要適用于現(xiàn)場施工。 特點：操作簡單、速度快、無明火作業(yè)、可全天候施工，節(jié)約大量鋼筋和能源。