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三民重科(ke)-主营(ying)混(hun)凝(ning)土(tu)(tu)泵(beng)车,小型(xing)混(hun)凝(ning)土(tu)(tu)泵(beng)车,搅拌(ban)泵(beng)车、搅拌(ban)天泵(beng)技(ji)术领(ling)先!搅拌(ban)泵(beng)行业(ye)开(kai)拓者

高标号混凝土泵送距离不够,如何是好?

混凝土泵在泵送(song)(song)(song)过程中(zhong),困(kun)难的就是混凝土标号高、坍落度小、粘度大(da)、距离(li)远(yuan)、泵送(song)(song)(song)压(ya)力(li)高等因素,这(zhei)些因素会导致泵送(song)(song)(song)效(xiao)率低(di)或(huo)泵送(song)(song)(song)距离(li)不够。要解决这(zhei)个(ge)(ge)问题,就必须注意以下几个(ge)(ge)方面:

1,在泵(beng)送前,对设备应充分检(jian)查

①主系统压力(li)可调(diao)节(jie)到32MPa,主要是考虑到泵送压力(li)高,主安(an)全(quan)阀溢流问题。

 ②主油泵排量(liang)调节至小,顺(shun)序阀压力不能低于10.5MPa,蓄能器(qi)内氮气要充足。

③滑阀油(you)缸密(mi)封件(jian)不(bu)能有内泄(xie),油(you)缸缓(huan)冲可适当(dang)小些(xie),润滑应充分、畅(chang)通,否则会因混凝土粘度(du)大、阻力大而导(dao)致(zhi)闸板(ban)提升缓(huan)慢或(huo)不(bu)到位,造成内漏浆而引起Y字管或(huo)变径管堵死。

④闸板(ban)磨(mo)损间隙不(bu)能太大,否(fou)则(ze)也会由(you)于(yu)内漏浆而引起同样故障。

⑤Y字管与(yu)上部壳体一定要密封严(yan)实(shi),否(fou)则也会由于漏浆而导致堵管,给施工带(dai)来不必要的损失。

2,对(dui)布管(guan)要(yao)求

①远(yuan)距离泵送阻力大,布管(guan)(guan)时要尽(jin)量减(jian)少(shao)弯(wan)(wan)管(guan)(guan),并应尽(jin)可能采用(yong)大弯(wan)(wan)而不(bu)用(yong)小弯(wan)(wan)。实践证明,每增设一(yi)个90o×R1000的(de)(de)弯(wan)(wan)管(guan)(guan),就相当于增加(jia)5m水平管(guan)(guan)。所以布管(guan)(guan)时仅用(yong)了4个φ125A的(de)(de)90o×R1000弯(wan)(wan)管(guan)(guan),其余均(jun)用(yong)φ125A×3m直(zhi)管(guan)(guan)和(he)φ125A×2m直(zhi)管(guan)(guan),总长(zhang)310m。

②应注意管(guan)子的加(jia)固(gu)以(yi)及管(guan)卡(ka)的紧固(gu)。这种远距离泵送,会遇到管(guan)子跳动加(jia)剧、管(guan)子爆裂、管(guan)卡(ka)炸开等现象。因此(ci)一(yi)定要在拐弯处及一(yi)些直管(guan)处于以(yi)充分加(jia)固(gu),减缓(huan)其冲击力。

3,泵(beng)送(song)前,打水不能太(tai)多,泵(beng)送(song)适量水润(run)滑(hua)管道(dao)

有些操作人员会(hui)误(wu)解,由于管(guan)道长(zhang),应(ying)加足够的水(shui)(shui)予以(yi)充分润滑。施工时(shi)(shi)泵送水(shui)(shui)量(liang)太多,造成有些管(guan)卡处皮圈(quan)冲(chong)坏、漏水(shui)(shui)。打砂浆(jiang)时(shi)(shi),由于砂浆(jiang)与(yu)水(shui)(shui)接触的界面长(zhang)时(shi)(shi)间受水(shui)(shui)浸泡,水(shui)(shui)把水(shui)(shui)泥浆(jiang)带走,造成砂浆(jiang)离析,泵送阻力加大,导致水(shui)(shui)泥浆(jiang)从(cong)冲(chong)坏的皮圈(quan)处往(wang)外挤,从(cong)而造成堵(du)管(guan)。

4,混凝土(tu)因标号高、粘度大,致使泵(beng)送困难

C60高(gao)标号混(hun)(hun)(hun)凝(ning)(ning)(ning)土(tu)(tu)(tu),其粗骨料(liao)粒径(jing)30mm以下(xia),级配合理(li);砂(sha)率39%,中细砂(sha);以及水泥(ni)用量均(jun)能(neng)达到泵(beng)(beng)送(song)(song)(song)要(yao)求。但(dan)受强度(du)(du)的(de)(de)(de)(de)制约(yue),其水灰(hui)比在O.2-0.3之间,致(zhi)使坍落度(du)(du)为12cm左右(you),影响(xiang)(xiang)混(hun)(hun)(hun)凝(ning)(ning)(ning)土(tu)(tu)(tu)泵(beng)(beng)送(song)(song)(song)时的(de)(de)(de)(de)流动性(xing),增大了(le)阻力(li)。增加砂(sha)率能(neng)提高(gao)其可泵(beng)(beng)性(xing),但(dan)影响(xiang)(xiang)了(le)强度(du)(du),达不到设计施工(gong)要(yao)求。因此,解决这一问(wen)题的(de)(de)(de)(de)唯一途径(jing)就是加减(jian)水剂,既不影响(xiang)(xiang)强度(du)(du),又可增大坍落度(du)(du)。开始泵(beng)(beng)送(song)(song)(song)时未加减(jian)水剂,泵(beng)(beng)送(song)(song)(song)压(ya)力(li)为26-28MPa,泵(beng)(beng)送(song)(song)(song)速度(du)(du)慢、效(xiao)(xiao)果(guo)差。如(ru)果(guo)长时间高(gao)压(ya)输送(song)(song)(song),会影响(xiang)(xiang)混(hun)(hun)(hun)凝(ning)(ning)(ning)土(tu)(tu)(tu)泵(beng)(beng)的(de)(de)(de)(de)稳定(ding)性(xing)和可靠性(xing)。后来掺入(ru)一定(ding)量的(de)(de)(de)(de)减(jian)水剂(NF-2),坍落度(du)(du)达到18-20m,泵(beng)(beng)送(song)(song)(song)压(ya)力(li)明显下(xia)降,仅(jin)为18MPa左右(you),使泵(beng)(beng)送(song)(song)(song)工(gong)效(xiao)(xiao)提高(gao)约(yue)一倍。另外,在泵(beng)(beng)送(song)(song)(song)过(guo)程中,还应提醒操作人(ren)员(yuan):料(liao)斗内的(de)(de)(de)(de)混(hun)(hun)(hun)凝(ning)(ning)(ning)土(tu)(tu)(tu)务必在搅(jiao)拌(ban)轴中线以上,否则(ze)会导(dao)致(zhi)吸空造成(cheng)混(hun)(hun)(hun)凝(ning)(ning)(ning)土(tu)(tu)(tu)四处飞溅伤人(ren),或(huo)由于吸空、气体压(ya)缩而造成(cheng)堵管。

5,泵(beng)送完后(hou),应(ying)及时(shi)清洗管(guan)道

管道(dao)清洗(xi)应从中间断开,分(fen)两次清洗(xi),以保证安全、可(ke)靠。需要注意的是:在塞海(hai)绵球(qiu)时,应在其前加上一个水泥袋(dai),用(yong)两个海(hai)绵球(qiu),再加上1个清洗(xi)活塞。

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