【正文】 od has been already a large amount of application in the project. Applicable scope : Suitable for Ⅱ , Ⅲ , Ⅳ grade reinforcing bar (including welding bad reinforcing bar ) with ribbing of Ф 18 50mm, connection between the same diameter or different diameters reinforcing bar . must squeeze link Extruders used in the covers, reinforced axis along the cold metal sleeve squeeze dedicated to insert sleeve Lane two hot rolling steel drums into a highly integrated mechanical linking methods. Characteristic: Easy to operate and joining fast and not having flame homework , can construct for 24 hours , save a large number of reinforcing bars and energy. Applicable scope : Suitable for , set up according to first and second class antidetonation requirement proof armored concrete structure ФⅡ , Ⅲ grade reinforcing bar with ribbing of hot rolling of 20 32mm join and construct live. cone thread connecting Using cone thread to bear pulled, pressed both effort and selflocking nature, undergo good principles will be reinforced by linking into coneprocessing thread at the moment the value of integration into the joints connecting steel bars. Characteristic: Simple , all right preparatory cut of the craft , connecting fast, concentricity is good, have pattern person who restrain from advantage reinforcing bar carbon content. Applicable scope : Suitable for the concrete structure of the industry , civil building and general structures, reinforcing bar diameter is for Фfor the the 16 40mm one Ⅱ , Ⅲ grade verticality, it is the oblique to or reinforcing bars horizontal join construct live. conclusions These are now monly used to connect steel synthesis methods, which links technology in the United States, Britain, Japan and other countries are widely used. There are different ways to connect their different characteristics and scope of the actual construction of production depending on the specific project choose a suitable method of connecting to achieve both energy conservation and saving time limit for a project ends. References 1 、 construction manual write the group. Construction manual. Beijing: China Construction Industry Press, 1992. 2 、 JGJ10796 reinforcing bar machinery connects the mon technical regulation 3 GB 149991 The armored concrete uses the reinforcing bar. 4 、 GB with ribbing of hot rolling 1301391 The armored concrete uses the round reinforcing bar of hot calendaring. 現(xiàn)澆樓板裂縫的產(chǎn)生與防治 隨著城市住宅建設(shè)步伐的加快，不少住宅小區(qū)相繼建成，許多住戶陸續(xù)搬進(jìn)新居，他們對住房的質(zhì)量要求越來越高，尤其對一些現(xiàn)澆樓板出現(xiàn)的裂縫情況非常關(guān)注，擔(dān)心這些裂縫最終會引發(fā)不安全事故，而紛紛向建筑質(zhì)量監(jiān)督部門投訴。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(jìn)行復(fù)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。《混凝土結(jié)構(gòu)工程施工質(zhì)量驗收規(guī)范 》規(guī)定，混凝土強(qiáng)度達(dá)到 ，不得在其上踩踏或安裝模板及支架。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(hù)，而失水收縮，使混凝土發(fā)生干裂，最終導(dǎo)致開裂。 板負(fù)筋下沉產(chǎn)生的裂縫。所以做好混凝土的澆水養(yǎng)護(hù)，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。 嚴(yán)格控制板面負(fù)筋保護(hù)層厚度?，F(xiàn)澆板應(yīng)選用中粗砂，粒徑在 之間的石子，砂石含泥量均不得超過 1％。 鋼筋混凝土結(jié)構(gòu)中鋼筋連接綜述 改革開放以來，隨著 國民經(jīng) 濟(jì)的快速、持久發(fā)展，各種鋼筋混凝土建筑結(jié)構(gòu)大量建造，鋼筋連接技術(shù)得到很大的發(fā)展。鋼筋機(jī)械連接常用有 3 種方法，主要適用于現(xiàn)場施工。 特點：接頭強(qiáng)度高，性能可靠，能夠承受高應(yīng)力反復(fù)拉壓載荷及疲勞載荷。 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。 特點：工藝簡單可以預(yù)加工連接速度快同心度好，不受鋼筋含碳量和有無花紋限制等優(yōu)點。