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摘要
塔式起重機作為建筑施工的主要設備，在建筑等行業(yè)發(fā)揮著極其重要的作用。塔式起重機屬于臂架型起重機，由于其臂架鉸接在較高的塔身上，且可回轉，臂架長度較大，結構輕巧、安裝拆卸運輸方便，適于露天作業(yè)，因此大多數(shù)用于工業(yè)與民用建筑施工。
塔式起重機是為了滿足高層建筑施工、設備安裝而設計的新型起重運輸機械。本次設計QTZ40塔式起重機為自升式上回轉塔式起重機，能夠隨建筑高度的升高而加升、占地面積小和拆裝方便等優(yōu)點，塔機上部能借助于液壓頂升機構，根據(jù)施工的建筑物的增高而相應地升高，使司機操作方便，視野寬并始終保持高清晰，主要適用于高層住房、高層建筑的施工。
本設計的題目是固定式QTZ40塔式起重機平衡臂的設計。QTZ40塔式起重機有多種形式，此次設計的形式為上回轉液壓頂升自動加節(jié)，可隨著建筑物的升高而升高，固定式高度為30米，在附著狀態(tài)下可達到100米。
本設計書主要包括四部分：第一部分主要是對現(xiàn)今國內外塔式起重機的發(fā)展現(xiàn)狀、趨勢以及QTZ40塔式起重機特點、應用場合，做了一個簡要的概述；第二部分是QTZ40塔式起重機總體方案的選擇及總體設計計算過程；第三部分是平衡臂設計和計算。
關鍵詞： QTZ40塔式起重機 平衡臂 設計
ABSTRACT
As an important facility, the tower crane plays an important role in construction industry. The tower crane belongs to the arm rack type crane. Its arm is hinged on the high tower body, and it may rotate. It has longer arm, dexterous structure. What’s more, it is easy to be assembled, disassembled and transported. It is suitable for the open-air work and mainly used for industry and civil construction
Tower cranes are to meet high-rise construction building, equipment installation and design as a new type machinery of lifting transport. The form of this design is tower crane ，the rotating structure of the QTZ40 tower crane is on the top. To the building of the height of the rise and add up, this crane covers an small area and open a convenient advantages of the tower on top of the department have the promotion, according to the construction of buildings improves and correspondingly increase, the driver is easy to operate with wide and remained high, which is applied to the construction of the high buildings.
The design topic is the stationary QTZ40tower crane system and the design of jack arm. There are many kinds of QTZ40 tower crane. The form of this design is as below. With an upper rotating hydraulic pressure propping system, the machine could add height automatically and thus rise with the building ascension. The stationary type is 30meter high; it could reach the height of 100meters.
This design book mainly includes four parts. The first part summarizes the present situation and the development tendency of the Tower crane in both our country and abroad, as well as the characteristic and application occasion. The second part is the QTZ40 tower crane overall concept choice and the system design computation process; the last part is the organization design and the computation of jack arm.
KEY WORDS: QTZ500 tower crane jack arm design