經過(guo)施(shi)(shi)工放樣(yang)、場地平(ping)整、基礎墊層填筑(zhu)、管身安裝、密封(feng)膠密封(feng)、涂刷瀝青(qing)、涵管回填等措施(shi)(shi),目前該(gai)金屬波紋(wen)管通道(dao)設施(shi)(shi)穩(wen)定,建(jian)設速度(du)比砼(tong)蓋板涵提前1個多月時間建(jian)成,有效解(jie)決了高填方路段傳統砼(tong)管涵施(shi)(shi)工工期長,影響(xiang)路基填方進度(du)的(de)問題。
鋼波紋涵管怎樣防止局部變形?
此項施工(gong)工(gong)藝不(bu)受(shou)外(wai)界環境影響,使土方(fang)施工(gong)與管涵安裝(zhuang)同(tong)步實(shi)施,兩者(zhe)“和諧共處”互不(bu)干擾,不(bu)僅加(jia)快了施工(gong)進(jin)度,縮短(duan)了工(gong)期,也節省了造價,還有利于(yu)控制質量(liang)。波紋涵管不(bu)少機器零件,如沖(chong)床的(de)連桿、鍛錘(chui)的(de)錘(chui)頭、火(huo)車掛鉤、沖(chong)模等(deng),在工(gong)作(zuo)(zuo)時要承受(shou)沖(chong)擊載荷、如果(guo)仍用靜載荷作(zuo)(zuo)用下的(de)強度極限指標來進(jin)行設計計算(suan),就不(bu)能(neng)保證這些(xie)零件工(gong)作(zuo)(zuo)時的(de)安全性(xing),必(bi)須(xu)同(tong)時考慮材(cai)料(liao)的(de)韌(ren)性(xing)。
波紋涵管洛(luo)氏硬(ying)度(du)(du)(du)(du)洛(luo)氏硬(ying)度(du)(du)(du)(du)試驗(yan)是用一定的(de)(de)(de)(de)載荷將頂角為120度(du)(du)(du)(du)的(de)(de)(de)(de)金(jin)剛石圓錐體或直(zhi)(zhi)徑(jing)為1.588mm的(de)(de)(de)(de)崔火鋼球壓(ya)入被測(ce)樣表面,根據壓(ya)痕(hen)的(de)(de)(de)(de)深度(du)(du)(du)(du)確定它的(de)(de)(de)(de)硬(ying)度(du)(du)(du)(du)值。洛(luo)氏硬(ying)度(du)(du)(du)(du)值可從洛(luo)氏硬(ying)度(du)(du)(du)(du)計刻度(du)(du)(du)(du)盤(pan)上直(zhi)(zhi)接讀出。波紋涵管硬(ying)度(du)(du)(du)(du)也是材(cai)料重要(yao)的(de)(de)(de)(de)力學性(xing)能指標,硬(ying)度(du)(du)(du)(du)和強度(du)(du)(du)(du)一樣,都反映了(le)材(cai)料對塑性(xing)變形(xing)的(de)(de)(de)(de)抗力,硬(ying)度(du)(du)(du)(du)試驗(yan)方法較簡單,又不損壞(huai)零(ling)件(jian),故在生產實踐中(zhong)往(wang)往(wang)通(tong)過測(ce)定材(cai)料的(de)(de)(de)(de)硬(ying)度(du)(du)(du)(du)來(lai)估算其強度(du)(du)(du)(du)指標。
鐵路鋼波紋管
鑒于以(yi)上(shang)特(te)殊(shu)情況(kuang),萬宜項目辦及設計方(fang)經過認真現場核實,合理進(jin)行變更,決定(ding)(ding)對該路段棄用(yong)(yong)傳統的(de)(de)砼管涵,采用(yong)(yong)金屬波紋涵管作為通道建設材(cai)料(liao)。該波紋涵管直徑達6米,長50米,由多片波形(xing)板片用(yong)(yong)螺栓拼接而成,其結(jie)構受力(li)情況(kuang)合理,荷載(zai)分(fen)布(bu)均勻,具有一定(ding)(ding)的(de)(de)抗變形(xing)能力(li)。
波紋(wen)涵管硬(ying)度還影響到(dao)材(cai)料的(de)耐磨性,在一(yi)般情況下,硬(ying)度高時其耐磨性能也較(jiao)好。波紋(wen)涵管用洛氏(shi)硬(ying)度計(ji)可以測量從軟到(dao)硬(ying)的(de)各(ge)種(zhong)不(bu)同(tong)材(cai)料,這是因為(wei)它(ta)采用了不(bu)同(tong)的(de)壓頭(tou)和載荷,組(zu)成(cheng)各(ge)種(zhong)不(bu)同(tong)的(de)洛氏(shi)硬(ying)度標(biao)尺,如HRA、HRB、HRC等。
一(yi)般生產以HRC(用(yong)120度(du)(du)(du)(du)(du)金剛石圓錐體作壓頭,載荷為1500N)用(yong)得多,波(bo)紋涵管(guan)(guan)硬度(du)(du)(du)(du)(du)值的(de)標注方法(fa)與(yu)布(bu)氏(shi)硬度(du)(du)(du)(du)(du)相同,硬度(du)(du)(du)(du)(du)值的(de)有(you)效(xiao)范圍為20~70HRC。波(bo)紋涵管(guan)(guan)洛(luo)氏(shi)硬度(du)(du)(du)(du)(du)法(fa)的(de)優點:測量(liang)簡單、迅速,并可測薄(bo)的(de)試(shi)樣和(he)硬的(de)材料(liao),但不(bu)如用(yong)布(bu)氏(shi)硬度(du)(du)(du)(du)(du)法(fa)準(zhun)確。當HBS>220時,HRC/HBS約等于1/10。波(bo)紋涵管(guan)(guan)沖(chong)擊韌性是指材料(liao)抵抗(kang)沖(chong)擊載荷的(de)能(neng)力。
波紋涵管目前工程上通常用(yong)櫻錘沖(chong)(chong)(chong)擊(ji)試驗(yan)(yan)來測量材料的沖(chong)(chong)(chong)擊(ji)韌性(xing),其原理,先將(jiang)被測材料制成一定形(xing)狀(zhuang)和尺(chi)寸的試樣(yang),安(an)放在沖(chong)(chong)(chong)擊(ji)試驗(yan)(yan)機(ji)上,把具有一定重量的櫻錘提(ti)到高(gao)度,此時擺(bai)(bai)錘位(wei)能(neng)為,然后讓其自有下落,沖(chong)(chong)(chong)斷(duan)(duan)試樣(yang),沖(chong)(chong)(chong)斷(duan)(duan)試樣(yang)后擺(bai)(bai)錘剩余的能(neng)量為gH2,擺(bai)(bai)錘沖(chong)(chong)(chong)斷(duan)(duan)試樣(yang)所消耗的位(wei)能(neng)為沖(chong)(chong)(chong)擊(ji)吸收(shou)功,用(yong)符號Akv表示(shi),單位(wei)為J,即Akv=g(H1-H2)J。
據了解,由于萬(wan)宜高速A3標(biao)14K+220m地(di)處橫向半填半挖路(lu)段(duan),且路(lu)基(ji)左右(you)兩測地(di)基(ji)承載力差異大、受(shou)力不均(jun)勻(yun),容易引起(qi)不均(jun)勻(yun)沉降導致傳統(tong)砼涵開裂(lie)。同時(shi),應當地(di)村民要求(qiu)盡快打通這(zhe)一通道,便于日常生產生活。(hanihanbj.com)
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