Palibe malo awiri ogwira ntchito omwe ali ofanana, koma nthawi zambiri amakhala ndi chinthu chimodzi chofanana: onse ali pamwamba pa madzi. Izi sizinali choncho pamene Helm Civil inamanganso matope ndi madamu a Army Corps of Engineers pa Mtsinje wa Mississippi pa Rock Island, Illinois.
Lock ndi Dam 15 idamangidwa mu 1931 ndi mipanda yamatabwa ndi zikhomo. Kwa zaka zambiri, kukwera kwa mabwato kosalekeza kwapangitsa kulephera kwa maziko akale pakhoma laling'ono lowongolera lomwe limagwiritsidwa ntchito ndi barge kulowa ndikutuluka mchipinda chotsekera.
Helm Civil, kampani yomwe ili ku East Moline, Illinois, inasaina mgwirizano wamtengo wapatali kwambiri ndi Army Corps of Engineers ku Rock Island District kuti iwononge ndege za 12 30-foot. Phatikizani ndikuyika ma shafts 63 obowola.
"Gawo lomwe tidayenera kupukuta linali la 360 m'litali ndi 5 m'mwamba," adatero Clint Zimmerman, woyang'anira ntchito wamkulu ku Helm Civil. "Zonsezi ndi za 7 mpaka 8 mapazi pansi pa madzi, zomwe zimabweretsa vuto lapadera."
Kuti amalize ntchitoyi, Zimmermann ayenera kupeza zida zoyenera. Choyamba, amafunikira chopukusira chomwe chimatha kugwira ntchito pansi pa madzi. Chachiŵiri, amafunikira luso laumisiri limene limalola wogwiritsira ntchito kusungitsa malo otsetsereka pamene akupera pansi pa madzi. Anapempha kampani yokonza misewu ndi katundu kuti iwathandize.
Zotsatira zake ndi kugwiritsa ntchito Komatsu Intelligent Machine Control (iMC) PC490LCi-11 excavators ndi Antraquiq AQ-4XL grinders ndi integrated GPS technology. Izi zidzalola Helm Civil kuti igwiritse ntchito chitsanzo cha 3D kuti chiwongolere kuya kwake ndikukhalabe olondola pamene akupera, ngakhale mulingo wa mtsinjewo umasintha.
"Derek Welge ndi Bryan Stolee adayika izi pamodzi, ndipo Chris Potter adachitanso mbali yofunika," adatero Zimmerman.
Kugwira chitsanzocho m'manja, ndikuyika chofufutira mosamala pamtsinje pamtsinje, Helm Civil ndi wokonzeka kuyamba ntchito. Pamene makinawo akupera pansi pa madzi, wogwiritsa ntchitoyo angayang’ane pa sikirini ya m’chipinda chofufutiracho n’kudziŵa bwino lomwe pamene ali ndi utali umene afunikira kupita.
"Kuzama kwa kugaya kumasiyana malinga ndi kuchuluka kwa madzi a mtsinje," adatero Zimmerman. "Ubwino waukadaulo uwu ndikuti timatha kumvetsetsa nthawi zonse pogaya mosasamala kanthu za kuchuluka kwa madzi. Wothandizira nthawi zonse amakhala ndi malo olondola ogwiritsira ntchito. Zimenezi n’zochititsa chidwi kwambiri.”
"Sitinagwiritsepo ntchito 3D modelling pansi pamadzi," adatero Zimmerman. "Tikadagwira ntchito mwakhungu, koma ukadaulo wa iMC umatithandiza kudziwa komwe tili.
Kugwiritsa ntchito makina a Komatsu mwanzeru kunapangitsa Helm Civil kumaliza ntchitoyi pafupifupi theka la nthawi yomwe ikuyembekezeka.
"Dongosolo logaya ndi la milungu iwiri," adatero Zimmerman. "Tidabweretsa PC490 Lachinayi, kenako tidayika chopukusira Lachisanu ndikujambulitsa malo owongolera pamalo ogwirira ntchito. Tinayamba kugaya Lolemba ndipo tinapanga mapazi 60 Lachiwiri lokha, zomwe ziri zochititsa chidwi kwambiri. Tidamaliza Lachisanu limenelo. Iyi ndiyo njira yokha yopulumukira.” CEG
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Nthawi yotumiza: Sep-01-2021