日韩精品国产一区在线久草-欧美在线电影一区二区-亚洲成人av片免费播放-一级特黄大片久久网-日本黄色视频久久-亚洲天堂男人在线-在线精品欧美日韩

NHI Headlines

Four national standards drafted by Northern Heavy Industries Group Co., Ltd.(hereinafter referred to as NHI) were officially released

Published:2022-01-12

On December 31,2021,the State Administration for Market Regulation and the National Standardization Administration issued the "People's Republic of China National Standards Announcement" (2021 No.17), officially approving 530 recommended national standards.Among them, four standards with international advanced level, which are hosted and drafted by Fangda Group NHI, are listed, namely GB/T41051-2021 "Safety Requirements for Full-face Tunnel Boring Machines for Rock Tunnel Boring Machines", GB /T41052-2021 "Full-face Tunnel Boring Machine Remote Monitoring System", GB/T41053-2021 "Full-face Tunnel Boring Machine Earth Pressure Balance - Slurry Balance Dual-Mode Roadheader", GB/T41056-2021 "Full-face Tunnel Boring Machine double-shielded Rock Tunnel Boring Machine".

National and industry standards for full-face tunnel boring machines have grown from scratch, and then gradually established and improved the product standard system. NHI has made outstanding contributions to the leading enterprise in China's tunnel boring equipment industry, and presided over the drafting of GB/T35019-2018 " National and industry standards such as Slurry Balance Shield Machine for Full-face Tunnel Boring Machines", GB/T41052-2021 "Remote Monitoring System for Full-face Tunnel Boring Machines", etc., participated in the drafting of all published and implemented national standards for full-face tunnel boring machines. These standards have played an important leading and supporting role in the technological development of the tunnel boring equipment industry and the transformation of scientific and technological achievements.

NHI has entered the field of full-face tunnel boring machine technology since 2004. In 2006, a 5.93-meter-diameter double-shielded rock tunnel boring machine was developed, breaking the long-term foreign monopoly and filling the gap in the country. The slurry balance shield machine with a diameter of 11.38 meters developed in the same year was applied in the Wuhan Yangtze River Tunnel Project, which is known as "the first tunnel of the Yangtze River in thousands of miles", which opened a new era of domestic shield machines crossing the river and the sea.

Through introduction, digestion and absorption and independent innovation, NHI has the technology to develop shield machines and rock tunnel boring machines with a diameter of 3 meters to 15 meters, and has become an important leader in the global full-face tunnel boring machine industry.


2018高清国产一区二区三区 | 人与人和人与物XXX 综合一区无套内射中文字幕 | 快穿之浪荡H啪肉NP文肉BL | 四川小少妇BBAABBAA | 内射少妇36P九色 | 91精品国产自产在线观看 | 蜜桃视频极品免费观看 | jul一078暴风雨…播放 | 天天影视色香欲综合网老头 | 天天影视色香欲综合网老头 | A级无遮挡超级高清-在线观看 | 亚洲精品国产日韩无码AV永久免费网 | 日日碰狠狠添天天爽无码av | 国产一卡 二卡三卡四卡无卡乱码视频 | 亚洲精品免费视频观看视频 | 亚洲欧美一区二区成人片 | 小明精品国产一区二区三区 | 亚洲精品熟女国产老熟女 | 情趣白丝女仆下部被揉小说合集 | 美女无遮挡无打码内射裸身视频 | 少妇性活BBBBBBBBB四川 | 一本色道久久a久久精品综合网站免费 | 久久夜色国产亚洲色欲AV | 丰满女教师中文字幕5 | 狂野欧美激情性XXXX在线观看 | 国产成人AV一区二区三区无码 | 99九九精品国产高清自在线 | 日韩精品午夜视频一区二区三区 | 久久国产精品国产精品 | 久久久久久精品天堂无码中文字幕 | 一级毛片女人喷潮 | 久久99人妻无码精品一区二区 | 中文字幕乱妇无码AV在线 | 狠狠色丁香婷婷久久综合 | 中文字幕无码中文字幕有码 | 欧美午夜一区二区福利视频 | 天堂MV在线MV免费MV香蕉 | 亚洲中文字幕无码视频 | 欧美亚洲精品中文字幕乱码免费高清 | 国产一区二区免费在线观看 | 免费看高视频hh网站免费 |