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室内安装监督规则

1、室内供水管道的安装

1、安装前应了解建筑物结构,熟悉设计图纸、施工方案及与其他工种的配合措施。 安装人员必须熟悉塑料管道的一般性能,掌握基本操作要点,严禁盲目施工。

2、当施工现场与材料存放地温差较大时,管道、管件安装前应在现场放置一定时间,使温度接近施工现场环境温度.

3、管道系统安装中断或完成的开口处,应随时封堵。

4、管线穿过墙体、楼板、预埋墙体时,应配合土建预留孔洞。 其尺寸设计如无规定,应按如下方式进行: a. 预留孔尺寸比管径大50~100mm; b. 埋墙暗管槽宽度为de+60mm,深度为de+30mm;

5、热水管穿墙时,应配合土建预埋套管; 冷水管穿墙时,可预留孔洞。 套管或孔的内径应为dn+40-50mm。

6、直埋暗装管道,宜采用先铺墙后开槽安装的方法。 开槽、开挖墙体前墙体砂浆强度可达到或超过设计强度​​水平的75%; 当墙体材料采用小型空心砌块或轻质砌块时,必须使用专用工具进行切割、钻孔、开槽,以免造成砌体松动、开裂。

7、管道室内表层敷设应在饰面层涂漆后进行,安装前应结合土建预留孔洞或预埋套管,不得采用后钻方式

8、架空管顶部净空不应小于100mm。

9、管道系统的横管应有2‰~5‰的坡度,并设有坡向排水装置。

10、塑料管穿过地板时,必须提供套管,套管可以是塑料管; 通过屋顶时,必须使用金属外壳。 套管应高于地面,顶板不低于100mm,并采取严格的防水措施。

11、塑料管的配水点和受力点必须采取可靠的固定措施。

12、管道安装前,宜按要求设置好管夹。 位置要准确; 埋设要平整牢固,管夹要与管子紧密接触,但不能损伤管子表面。

13、如使用金属管夹固定管道,金属管夹与塑料之间应使用塑料胶带或橡皮橡胶垫片,不得使用硬质垫片。

14、立管与塑料管水平管的支撑距离不得大于下表,单位:(mm)

15、管道敷设严禁轴向扭曲。 穿过墙壁或地板时不要强行校正。

16、塑料管与其他金属管平行走线时,应留有一定的保护距离。 设计无规定时,净距不应小于100mm。 平行运行时,塑料管应在金属管内。

17、本项目供水系统为优质管道供水,水源来自校园内优质直供水管网。 本项目室外直埋优质水管采用钢丝网骨架HDPE复合管; 室内优质水采用钢丝网骨架HDPE复合供水管,热熔连接。

18、HDPE复合给水管安装要点:

(1)管道与管件的连接采用热熔连接,不允许在管道与管件上直接穿线。

(2)热熔连接施工采用厂家提供的热熔设备,保证焊接质量。 手持式焊接工具适用于小口径管道和系统的终接,小车式焊接机适用于大口径管道的预装配连接。

(3)焊接施工应严格按规定的技术参数进行操作。 在加热和插入过程中,管道和管件不应旋转,而应直接插入。 正常焊接应在结合面有均匀的焊环。

19、热熔连接应按下列程序进行:

Δ热熔工具通电,待工作温度指示灯亮后方可开始操作;

Δ根据实际安装尺寸计算管子的切割长度,管子的焊接深度可按下表规定取用;

Δ 切割管子应使用剪管机或切管机,如使用锋利的钢锯,切割后必须去除断口的毛刺和毛刺 c 切割的端面必须垂直于管子的轴线;

Δ管材、管件焊接面必须清洁、无异物、干燥、无油污;

Δ应按设计图方向焊接弯头或三通。

Δ 连接时,应将管材不旋转地导入加热套内,插入到所需的焊接深度,同时将管材不旋转地推到加热头上,达到规定的深度标记。 加热时间必须符合本规程的规定;

Δ加热时间到后,立即从加热夹套和加热头上同时取下管子和管件,迅速直线插入到标定深度,不要旋转,使法兰处形成均匀的法兰联合的;

Δ 在本规程下表规定的加工时间内,刚焊好的接头仍可矫正,但严禁旋转。 在规定的冷却时间内,应支撑管件,使其不受扭曲、弯曲和拉伸。

20、管道采用法兰接头时,应符合下列规定:

Δ 将法兰套在管道上;

Δ管道过渡接头和管道热熔连接步骤应符合本标准的规定;

Δ连接的两个法兰垂直于管道的中心线,使连接的管道在同一轴线上; 螺栓孔的中心偏差一般不超过孔径的5%,保证螺栓穿入自如;

Δ法兰垫片应采用耐热无毒橡胶垫片;

Δ 应使用相同规格的镀锌螺栓。 螺栓应对称拧紧,螺母安装方向应一致。 紧固的螺栓应露出螺母的1-2个螺纹;

Δ 应准确计算所连接管道的截断长度,使管道在拧紧螺栓时不产生轴向拉力或变形;

Δ法兰连接件应设有支吊架。

Δ管道安装时应对法兰密封面和密封垫进行外观检查,不得有影响密封性能的缺陷;

Δ法兰连接应保持平行,偏差不应大于法兰外径的1.5‰,且不大于2mm。

Δ管道对中时应检查管道的直线度,在距离接头中心200mm处测量,允许偏差为1mm/m,但全长最大允许偏差不超过10mm。

21、干管安装:首先了解并确定主管的标高、位置、坡度、管径等,并按尺寸正确埋设支架。 支架牢固后,即可架设连接。 管道和管件可先在地面组装,长度应便于吊装。 抬起后轻轻落在支架上,用支架上的卡环固定,防止滚落。 带螺纹的管道可以在吊装后拧紧。 主管安装完毕后,需要进行调整和校直。 从管子的末端看,整根管子在一条直线上; 主管的直径应在距主支管一定距离后与支管分开。 尺寸与大管径相等,但不小于100mm; 干管安装后,用水平仪检查各段,防止局部管段“塌陷”或“起拱”。

22、支管、立管安装:干管安装 干管安装完成后,即可安装立管。 用一根线挂在立管的位置上,用“粉囊”在墙上弹出一条竖线,立管就可以按线安装了。 同时,根据墙上的线路和立管与墙体确定的尺寸,可以提前预埋立管卡。 竖管的长度很长。 若采用螺纹连接,可按图纸上确定的立管管件测量实际尺寸并记录在图纸上,并先进行预装配。 安装后,经调直后,对立管管段进行编号,然后拆开,在现场重新组装。 安装立管后,即可安装支管。 方法是先在墙上弹出定位线,但要连接的设备安装定位好后才能连接。 安装方法与立管相同。

23、管道试压

①首先检查整条管线的所有控制阀是否开启,是否与其他不能参加试压的管网和设备相隔离。

②将试压泵、阀门、压力表、进水管等接上管路,并注满水。 水满后,排空管路系统中的空气(直至水流出放气阀),关闭放气阀。 注水后关闭进水阀。

③ 压力达到试验压力时停止加压。 管道在测试压力下保持 20 分钟。 管路未发现泄漏,压力表指针下降不超过0.02MPa,则认为强度试验合格。

④减压至工作压力进行密性试验。 对管道在工作压力下进行全面检查。 稳压24小时后,如果压力表指针不下降,管道焊缝和法兰连接处未发现渗漏,则可认为密性试验合格。

⑤试验中如有泄漏,不得带压修理。 缺陷消除后,应重新进行试验。

⑥系统测试合格后,填写《管道系统测试记录》。

24.管道系统冲洗

管路系统强度、密性试验合格后,分段冲洗。 冲洗顺序一般应按主管、支管、排水管依次进行,分段冲洗。 冲洗合格后,应填写《管道系统冲洗记录》。

二、室内排水管道的安装

1、安装前认真熟悉图纸,查阅建筑结构图、装修建筑图、相关设备专业图纸,检查各管线坐标高度是否相交,管线布置占用空间是否合理,如有问题及时与设计及相关部门联系。 人员研究解决,办理变更谈判记录。

2、破管要齐平,并使用专用破管工具(剪刀、切割机)。 粘接前应先对插座进行测试,不要完全插入,一般为插座深度的3/4,测试插入合格后,用棉花擦去插座待粘接部分的水分和灰尘布。 如果有油渍,需要用乙丙酮去除。 用刷子涂胶,先涂插座再涂插座,然后用力垂直插入,插入粘合时稍微转动插座,使粘合剂均匀分布,约30°即可粘合几秒钟到一分钟坚定。 待其牢固后立即擦去溢出的粘合剂。

3、管道安装时,应根据设计坐标、标高、现场电缆准备好支架、吊架,确定排水方向的坡度。 全部粘好后,管道应平直,坡度均匀,预留开口位置准确。 干管安装完成后,应进行闭水试验压力表铜空心接头,试验合格后应密封预留孔口并堵孔。

4、地管安装

(1)根据管道系统和卫生设备的设计位置,结合设备出水口尺寸和排水管出水口施工要求,配合土建结构施工,预留出水口或墙壁、横梁、地板上的管件;

(2)检查各预留孔的位置和尺寸并打入;

(3)根据管道走向和各管段中心线标记进行测量,绘制实测小样图,并详细注明尺寸;

(4)根据实测样图选择合格的管材和管件,进行配管和切割。 预制管段准备完成后,根据小样图检查节点尺寸和管件接口方向;

(5)根据规格选择支架和固定支架的形式,确定支架的规格和数量;

(6)土建墙粉刷完成后,可将材料和预制管段运到安装现场,按照预留的管口位置和管道中心线依次安装管道和伸缩缝,并连接管口;

(7)在需要安装防火套管或挡火圈的楼层,先将防火套管或挡火圈套在管段外,再接好管道接口。

(8)管道安装应自下而上分层进行,先安装竖管,后安装横管,连续施工;

(9)管道系统安装完毕后,复核管道的外观质量和安装尺寸,复核无误后进行试水。

5、立管安装前,先从高处拉一根垂直线到一楼,保证垂直度; 安装时按设计要求安装膨胀节。 如无设计要求,应符合下列规定:当层高小于或等于4m时,排水立管通风立管每层设一个伸缩缝; 当层高大于4m时,其数量应根据管道的设计伸缩量和伸缩缝的允许伸缩量计算确定。 安装位置一般是将膨胀节安装在三通下方(如果三通在地板上,则放在三通上方)。

6、排水塑料管的支吊架最大距离应符合下表规定:

管径(mm)

50

75

110

125

160

立管

1.2

1.5

2.0

2.0

2.0

横管

0.5

0.75

1.10

1.30

1.60

7、立管检查口按设计要求设置。 安装高度为离地1m。

8、暗装或埋设的排水管在暗装前必须进行检测,其高度不得低于底部卫生洁具的上沿或底层地板的高度。 检查方法:满水15分钟后,水位下降,然后加满,观察5分钟,若液位不下降,管道及接头无渗漏现象,则为合格。

九、生活污水塑料管坡度必须符合设计要求或下表规定:

物品

管径(mm)

标准坡度(‰)

最小坡度(‰)

1个

50

25

12

2个

75

15

8个

3个

110

12

6个

4个

125

10

5个

5个

160

7

4个

10、排水塑料管必须按设计要求和位置设置膨胀节。 如设计无要求,伸缩缝间距不应大于4m。 管线穿越楼板时应安装金属或塑料套管,穿越屋面必须采用金属套管。 套筒内径可比穿管直径大10~20mm。

3、卫生洁具的安装

1、根据设计图纸和业主的要求,确定卫生洁具的生产厂家和型号。 根据洁具实际样品确定安装位置,预留排水管口,减少二次钻孔。

2、根据洁具配件的实际尺寸购买专用工具,如梅花扳手、叉形扳手等。 这些专用工具用于确保铜件、镀铬件和塑料件的表面在安装过程中不会受到咬伤和划伤。 美观,专用工具易于使用和操作。

3、安装前应对卫生洁具及配件进行检查,主要是外观检查有无破损、出水口圆度、塑料配件的圆度和硬度等,不符合要求的不得安装。

4、地漏塞、地漏的安装应直立、牢固,低于排水面,四周无渗漏。 地漏水封高度不小于50mm; 卫生器具的支架、支架必须防腐良好,安装平整牢固,与器具接触紧密、稳定。

5、凡是水平排水连接的卫生器具,其进水口和竖管均应采取适当可靠的固定措施; 管道与地面连接处应采取牢固可靠的防渗漏措施。

6、洁具安装的允许偏差应符合下表:

4、防雷接地安装

1、防雷支架安装:

(1)先埋一条直线两端的支架,然后用铁丝埋一条直线的其他支架。

(2)支架应有燕尾槽(特殊要求除外),角钢支架埋入深度不应小于100mm,扁钢、钢支架埋深不应小于90mm。

(3)防雷装置各支架顶部应距建筑物表面100mm; 接地母线支架末端应离墙20mm。

(4) 支撑物之间的水平距离不应大于1m; 垂直距离不应大于1.5m,各距离应均匀,允许偏差30mm。 转角外两侧的肘板距转角中心不大于250mm。

(5) 用于预埋支架的水泥砂浆配合比不应低于1:2。

2、防雷网安装:

(1)防雷网卡固定时,应加镀锌弹簧垫和平垫。

(2)防雷带的弯曲不应小于90°,​​弯曲半径不应小于圆钢直径的10倍。

(3)防雷带为扁钢时,截面不小于48mm2; 如果是圆钢,直径不小于8mm。

(4) 变形缝应作弯曲补偿。

(5)网格密度不大于20m×20m。

(6)建筑物屋顶有突出物,如金属旗杆、铁栏杆、梯子、电视天线等,这些部位的金属导体必须与防雷网焊接在一起。

3、安装前熟悉图纸,密切配合土建,现场掌握施工进度:

(1)本工程采用土建基础底部钢筋作为接地体。

(2)土建施工中破桩前,先标记好待焊的预制根,预制根要长出30cm后才能断开,然后用锤子敲掉30cm桩的混凝土,并按规定弯曲外露桩筋与基础底面相接。 肋拱焊接。 底筋和桩筋焊好后,柱主根(2对角)底部拱焊底板筋,两柱主筋用彩漆标示,便于抽取和拆卸。检查。

(3)接地体安装后,应及时经防雷研究所验收。 回填或浇注混凝土前,接地体的材质、位置、焊接质量应符合施工规范要求。 接地电阻。 并保持良好的记录。

4、接地装置的焊接宜采用搭接焊,搭接长度应符合下列要求:

(1)扁钢与扁钢搭接处为扁钢宽度的两倍,焊接不少于三边。

(2)圆钢与圆钢的搭接为圆钢直径的6倍,双面焊接;

(3)圆钢与扁钢的搭接为圆钢直径的6倍,双面焊接;

(4)扁钢与钢管,扁钢与角钢焊接,紧贴角钢外侧,或紧贴3/4钢管表面,上下焊接;

(5)除焊缝埋入混凝土外,有防腐措施;

5、预埋安装线管

1、施工中应注意:

(1)塑料管不应有压扁、裂纹,管内无杂物,切断口应平整,管口应刮平;

(2)塑料线管的连接处采用胶水粘接,管接头两端应与地板底部加强筋粘接牢固;

(3)塑料管的粘接必须牢固、严密,管口应塞上塑料管塞,以防灌桨、堵管;

(4)各种开关、插座底盒、灯位接线盒及混凝土地面、墙体、砖结构内的管道必须用接线头连接,严禁将塑料管直接伸入接线盒内;

(5)暗装在混凝土中的接线盒要求内部用湿水泥纸或塑料泡沫填满,不允许在外面用水泥纸包裹。 预埋在楼板、剪力墙内的塑料导管、接线盒应固定牢固,防止移位。

2、外露管线的施工方法一般为沿墙、托架、吊架布管。 铺管前,应按设计图纸或标准图纸对各种支架、吊架、大钢管进行预弯加工。

3、支架、吊架一般采用角钢制作。

4、测量定位

(1)外露配管宜在建筑物装饰面完成后进行。 布设前,应根据设计图纸确定配电设备、各种箱、箱、电气设备的位置,并将箱、箱、建筑物固定牢固。 在水平和垂直方向进行卡线定位。 支吊架固定点间距应均匀。

(2) 裸露管道的弯曲半径不应小于管道外径的6倍,且不应小于插入电缆的最小允许弯曲半径。

(3)配管时应注意每根电缆管的弯头不超过3个,直角弯头不超过2个。

(4)管道超过一定长度,应安装接线盒,其位置便于穿线。 明管穿过建筑物伸缩缝和沉降缝,应当采取补偿措施。

5、线管暗敷形式:

(1)现浇混凝土楼板、墙、柱、梁的管道沿墙砌砖。

(2)暗装管线施工必须与主体土建密切配合施工,主体土建施工时应给出建筑标高。

(3) 配管应尽量减少转弯,走最短路径。 综合考虑后压力表铜空心接头,确定管道敷设的合理位置和方向,确定正确箱体的正确位置。

(4)根据现场实际铺设施工图加工各种弯管、箱体。

(5)箱、箱位置的确定根据施工图的要求,确定箱、箱的轴线位置,以土建标出的水平线为基准,将连接件找平,并在实际安装时作标记盒子的位置。

(6) 固定箱

管道和钢筋可用铁丝绑扎固定。 箱、箱表面与建筑物、构筑物表面的距离一般不小于15mm。 箱、箱内应填满塑料泡沫或其他填充物,防止水泥掉落。 要求箱、箱放平、牢固,坐标正确。

6、灯光安装

1、灯具安装前熟悉电气图纸,核对灯具型号、规格、数量是否符合设计规范要求;

2、电气照明装置的安装一般采用预埋式接线盒、挂钩、螺钉、膨胀螺栓或塑料塞等固定方式,严禁使用木楔进行固定。

3、在易燃构筑物、装饰件和木制家具上安装照明灯具时,灯具周围应采取防火、隔热措施,并应选用冷光源灯具。 安装在绝缘台面上的电气照明装置,其导线接头的绝缘部分应突出绝缘台面。

4、电气照明装置接线应牢固,电气接触良好; 需要接地或接零的灯具不带电金属部分应有专用接地螺钉,并有明显标志。

5、额定电压为220伏的金属灯的保护接地要求:

(1)安装在距地2.4米以下高度的灯具金属外壳必须接保护地线。

(2)对于安装在可以进入人的吊顶上的通用和专用灯具,由于使用和维修不便,为了安全起见,灯具的金属外壳应连接保护地线。

(3)灯具的保护接地线应与灯具专用接地螺钉可靠连接,保护接地段应根据灯具的相段选择。 当灯具的相线截面小于1.5mm2时,保护线的截面不应小于1.5mm2的铜芯绝缘线。

(4)灯具固定应牢固可靠,每盏灯具固定螺栓不少于2个。

(5)吸顶灯重量大于3kg时,宜采用预埋挂钩或螺栓固定。 当软线吸顶灯重量大于0.5kg时,应加吊杆或链条将灯吊起。

(6)链条吊灯的吊链宜采用法兰、镀金铁链或承重拉索等配套产品。 吊链灯的灯具不能使用张力,灯线必须与吊链一起插入。

(7) 连接灯的软线扣和镀锡压线。 使用螺口灯头时,相线接在螺口灯头中间的端子上;

7、室内电缆桥架安装及架内电缆敷设

1. The metal cable tray and its support and the metal cable conduit leading in or out must be grounded (PE) or connected to zero (PEN) reliably, and must meet the following regulations:

(1) The total length of the metal cable tray and its support should be connected to the ground (PE) or neutral (PEN) main line at no less than 2 places;

(2) The two ends of the connecting plate between the non-galvanized cable trays are connected to the copper grounding wire, and the minimum allowable cross-sectional area of ​​the grounding wire is not less than 4mm2.

(3) The two ends of the connecting plate between galvanized cable trays do not cross the grounding wire, but there are no less than two connection fixing bolts with lock nuts or lock washers at both ends of the connecting plate.

2. Defects such as twisting, armor flattening, sheath breakage and severe surface scratches are strictly prohibited in cable laying.

3. The installation of the cable tray shall meet the following requirements:

(1) If the length of the steel cable tray in the straight section exceeds 30m, and the length of the aluminum alloy or glass fiber reinforced plastic cable tray exceeds 15m, an expansion joint is provided; the cable tray crosses the deformation joint of the building and is equipped with a compensation device;

(2) The bending radius of the cable tray shall not be less than the minimum allowable bending radius of the cable in the bridge. The minimum allowable bending radius of the cable is shown in the table below;

Cable minimum allowable bending radius

序列号

电缆类型

Minimum allowable bending radius

1个

Rubber insulated power cable with lead-free steel-clad armor sheath

10天

2个

Rubber insulated power cables with steel armor sheath

20D

3个

PVC insulated power cable

10天

4个

XLPE insulated power cable

15D

5个

Multicore Control Cable

10天

Note: D is the outer diameter of the cable

(3) When there is no requirement in the design, the distance between the supports for horizontal installation of the cable tray is 1.5~3m; the distance between the supports for vertical installation is not greater than 2m;

(4) The bolts between the bridge frame and the bracket, and the bolts of the bridge connecting plate are fixed and fastened without omission, and the nuts are located on the outside of the bridge frame; when the aluminum alloy bridge frame and the steel bracket are fixed, there are mutual insulation measures to prevent galvanic corrosion;

(5) The cable tray is laid under the flammable and explosive gas pipelines and thermal pipelines. When there is no requirement in the design, the minimum clear distance from the pipelines shall meet the requirements of the following table:

The minimum clear distance from the pipeline (m)

Pipeline category

equal clearance

Cross Clearance

General Process Piping

0.4

0.3

Flammable and explosive gas pipeline

0.5

0.5

Heat pipeline

With insulation

0.5

0.3

no insulation

1.0

0.5

(6) The bridges laid in shafts and passing through different fire protection zones shall be positioned according to the design requirements and have fire blocking measures;

(7) When the bracket and the embedded parts are welded and fixed, the weld seam is full; when the expansion bolt is fixed, the bolt is used to fit, the connection is fastened, and the loosening parts are complete.

4. Cable laying in the bridge frame should meet the following requirements:

(1) For cables laid with an inclination greater than 45°, set fixed points every 2m;

(2) Do sealing treatment for cables entering and exiting cable trenches, shafts, buildings, cabinets (panels), platforms, and pipe nozzles;

(3) Cable laying shall be arranged neatly. For cables laid horizontally, fixed points shall be set at both ends of the head and tail, on both sides of the turn, and at intervals of 5-10m;

Distance between cable fixing points (㎜)

电缆

Fixed point spacing

电源线

full plastic

1000

Cables other than all-plastic

1500

控制电缆

1000

5. There should be signs at the beginning, end and branch of the cable.

8. Electric circuit inspection and insulation resistance shaking test

1. Line inspection: After the connection and wrapping of the wires are all completed, self-inspection and mutual inspection should be carried out to check whether the quality of the wire joints and wrapping meets the requirements of the specification and the requirements of the quality inspection and evaluation standards. After the inspection is correct, perform the wire insulation shake test.

2. Insulation shaking test: After the wires are laid, the insulation shaking test of each branch wire is carried out before the appliance is installed; the insulation shaking test of the line generally uses a 500V megger with a range of 0-500MΩ. First of all, it is carried out by household, separate the wires in the lamp head box, connect the wires in the switch box, and measure the insulation resistance of lighting, sockets, air-conditioning branch lines, and trunk lines respectively. One person shakes the test, and one person reads in time. The shaking speed is about 120r/min. The reading should be taken after 1 minute, and records should be made. At the same time, relevant on-site supervisors are invited to supervise and sign.

3. Pay attention to safety: when measuring line resistance with a megohmmeter, prevent people from touching the line and equipment being measured, and it is forbidden to measure line insulation in lightning weather.

9. Installation of galvanized air ducts for air-conditioning, ventilation and fire-fighting smoke exhaust systems

Galvanized air ducts are used in air-conditioning fresh air systems. Most of the ventilation ducts in this project will be processed into air duct components on site.

1. Handmade air duct

(1) For air ducts of different specifications, plates of different thicknesses required by the specifications are used. On the basis of being familiar with the size and layout of the air ducts in the drawings, skilled craftsmen will lay out the wires and cut the materials to ensure the standardization of the appearance dimensions of the air ducts and the pipelines.

(2) The air duct flange will be uniformly produced according to the series of specifications specified in the drawings. The bolt holes of the flange are punched at a fixed distance with a punch and a mold, and the forming welding of the flange is also performed with a special mold for positioning welding to ensure that the same specification Duct flanges are interchangeable.

(3) After the steel plate is cut, skilled riveters will carry out processes such as pressing the reinforcement, biting, and bending to make the air duct, and the biting should be tight. After forming, fix the flanges at both ends of the air duct, and rivet the flanges on the air duct when the faces of the two flanges are parallel. When the air duct and flange are riveted, the flange should be flat, the width should be consistent, and it should not be less than 6mm, and there should be no cracks or holes. The key points for the co-production of air ducts and flanges are the accuracy of material cutting and the smoothness of the production site. The finished air ducts must not be twisted or inclined. After the air duct is made, it is numbered according to the system.

2. The assembly process of the air duct

(1) Find the corresponding prefabricated part of the same section of air duct according to the self-number, place the prefabricated part on the horizontal angle iron frame, and wipe it clean with a rag.

(2) Since the air pipe may be deformed during transportation, the bending angle, bite and flange of the air pipe must be adjusted before assembly; use a screwdriver to bite the bite of the air pipe too tightly Adjust it to a suitable position; insert the end with the bite into the flange corner, and apply glass glue for sealing; shoot the single bone into the double bone;

Repeat the above work, and bite the other side.

3. Air duct installation

The connection between the air duct sections adopts two connection methods without flange and with flange. The non-flange connection is used for air ducts with a small side length (≤630mm), and is commonly used as a C-type insert connection; the flange connection is used for air ducts with a large side length (>630mm), with ordinary angle steel flanges and TFD mechanisms There are two types of special flanges, and sealing rubber strips should be placed between the flanges.

4. Fabrication and installation of supports and hangers

According to the requirements of the specification, different sizes of supports and hangers are used for the air ducts of different specifications. The length of the boom should be cut and processed according to the size and installation height of the air duct, as well as the height of the floor beam. The threaded thread at the end of the suspender must meet the requirements for adjusting the elevation of the air duct. The top of the suspender is welded and fixed to the angle steel yard, and the suspender is oiled with anti-rust paint and topcoated twice.

5. Air duct hoisting

According to the requirements of the design drawings and national specifications, the air duct installation is carried out. According to the distribution of each system of the air duct on the drawing, arrange and combine according to the number of the prepared air duct, 8 to 10 meters is a section, check the size of the air duct, and the axis position conforms to the drawing before hoisting. When installing the air duct, the supervisor should stick to the bottom of the girder as much as possible, and the branch pipe should be installed as high as possible. After the air duct is installed, check whether the installation height of the air duct meets the design requirements, whether the level and verticality of the air duct meet the specification requirements, whether the brackets are skewed, and whether the bracket spacing meets the requirements.

6. Air leakage test of air duct

The detection should be carried out at night to ensure that the surrounding environment is dark. Place a 100W low-voltage lighting lamp with a protective cover on the inside or outside of the air duct, move slowly along the detection part and the seam, and observe on the other side. When light is found If it is shot out, it means that an obvious air leakage site has been found, and a record should be made.

The low-pressure system (working pressure ≤ 500Pa is a low-pressure system) spot checks 5%, and there should be no more than 2 light leakage points per 10 meters of joints, and no more than 16 joints per 100 meters of joints. Air conditioning and ventilation systems are all low pressure systems.

The medium pressure system (working pressure ≤1000Pa is a medium pressure system) spot checks 20%, and there should be no more than 1 light leakage point per 10 meters of joints, and the average number of 100 meters of joints is not more than 8. The smoke control and exhaust system of this project belongs to the medium pressure system.

7. Tuyere installation

The tuyere installation is carried out in conjunction with the decorative ceiling, and the installation without ceiling is carried out according to the needs of the system. The connection between the tuyere and the air pipe should be tight, and the arrangement of the tuyere should be arranged in rows and columns as far as possible according to the design drawings.

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