No longer need or use a similar double root consisting of three drill pipe drilling means root, it can reduce the derrick height, the weight of the base can be reduced.

不再需要采用類似雙根或三根鉆桿構(gòu)成的立根鉆井方式，因此井架高度可以減小玖玖视頻，底座的重量可以減輕www、色。

Its nonlinear effect has been dealt with equivalently in this thesis.

本文對井架繃繩的非線性效應(yīng)進行了等效處理。

In an emergency, the derrickman can quickly reach the ground by an escape line often called the Geronimo line.

在危急情況下欧美性爽欧美精品一，井架工能夠通過一通常稱之為geronimo鋼絲繩的逃生鋼絲繩很快地到達地面欧美在线免费观看视频。

Gin Pole - An "A" frame structure located at the top of standard derricks used to lift and lower the crown block into position.

天車人字架：一個" A "形框架結(jié)構(gòu)，位于標(biāo)準(zhǔn)井架的頂部人人澡人人爽人人夜夜，用于起升和放下天車到指定位置自拍偷拍精品专区。

The result of the measurement shows that the maximum stress on the gin pole is 120.8 MPa and that on the mast is 191 .2MPa,the measured values are very close to the calculated values,and this proves the hoisting method correct.

測量結(jié)果表明，人字架最大應(yīng)力120.8MPa这男人看的黄色视频。成年人看的黄色视频。，井架最大應(yīng)力191.2MPa玖玖日韩在线视频，實際測量應(yīng)力值與理論計算值十分接近，說明起升方法正確射射人人。

We soon realized that the black mark was Baba Grugru oil spraying up into the air above the derrick.

不久我們就意識到那黑色的東西正是噴過井架射入高空的巴巴古爾古爾的石油国产91页在线精品。

At the top of the shaft there is usually a structure called a headframe.

在井筒頂部通常都有一個叫作井架的建筑，其上裝有一些采礦作業(yè)所需要的機械設(shè)備把女人弄爽A片视频。

At the top of the shaft there is usually a structure called a headframe. It contains some of the machinery necessary for mining operation.

在井筒頂部通常都有一個叫作井架的建筑国产春黄视频网，其上裝有一些采礦作業(yè)所需要的機械設(shè)備。

Many examples of such headframe have been built and have provided good service.

許多礦井都建有這種類型井架精品高清久久久久久久久，大都生產(chǎn)情況良好中文字幕350页。

Through an engineering practice, this paper presented the techniques of headframe lifting , and discussed a series of problems occurred in the process of headframe lifting .

通過實際工程實例，對井架的起吊工藝進行了有針對性的敘述久久精品视频九九；同時很黄很黄的免费视频在线观看，對起吊過程中出現(xiàn)的一系列問題，做出了積極的討論黄色视频在线流畅。