發(fā)布時間：2018-01-27 03:13

  本文關(guān)鍵詞： 氣動沖擊矛 滯止壓力 鎖定調(diào)節(jié) 雙向沖擊 運動仿真　出處：《吉林大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：我國的城市化進程正在逐步加快，可利用的土地資源日益緊張，將更多的管線鋪設(shè)到城市地下，讓城市交通、通訊的立體化成為未來城市建設(shè)的重要發(fā)展方向。傳統(tǒng)的地下管線施工方法對地面上的交通和環(huán)境帶來了極大的影響，同時，也給市民正常生活和工作帶來許多的不便。與傳統(tǒng)的地下管線施工方法相比，非開挖施工技術(shù)具有施工期短、適用性強、安全性好、對地面干擾小、綜合成本低等優(yōu)點，因此非開挖施工技術(shù)在我國的基礎(chǔ)施工領(lǐng)域中被廣泛使用，同時帶來的是非開挖施工技術(shù)相關(guān)設(shè)備的大量研發(fā)。 氣動沖擊矛法作為其中的一種施工技術(shù)方法，可以在不同地層的土體中快速成孔，且成孔質(zhì)量較好，還可以根據(jù)工程的需要進行不同直徑大小的擴孔�？煽貧鈩記_擊矛具有運動的可控性，即可以實現(xiàn)自由的前進和后退功能。 通過對比國內(nèi)外氣動沖擊矛的配氣方式和結(jié)構(gòu)原理，研究和分析不同型號沖擊矛的結(jié)構(gòu)特點，再結(jié)合施工技術(shù)的要求，設(shè)計出雙向鎖定可控沖擊矛，使其可以根據(jù)實際土體的彈塑性力學(xué)性質(zhì)，通過調(diào)整氣動沖擊矛活塞運動的配氣行程和氣源壓力，讓沖擊矛的沖擊頻率和沖擊功與地層土體相匹配，，實現(xiàn)快速、有效的擠密鉆進，同時還具有雙向沖擊運動的功能。為了保證沖擊矛穩(wěn)定可靠的工作狀態(tài)，在沖擊矛的結(jié)構(gòu)設(shè)計中增加了鎖定調(diào)節(jié)機構(gòu)、浮動密封裝置和分體式擠密鉆頭。 根據(jù)氣動沖擊矛的配氣方式和結(jié)構(gòu)原理，以氣體熱力學(xué)和動力學(xué)理論為基礎(chǔ)，運用Visual Basic語言設(shè)計并編寫活塞運動仿真程序，利用程序研究和分析氣動沖擊矛內(nèi)部活塞的動力特性，掌握活塞的運動規(guī)律，分析出內(nèi)部沖擊機構(gòu)的主要設(shè)計參數(shù)。通過參數(shù)的優(yōu)化配置與回歸性分析，計算出最優(yōu)的氣動沖擊矛結(jié)構(gòu)尺寸以及沖擊性能參數(shù)。 運用有限元分析軟件，對氣動沖擊矛的活塞和后接頭進行靜應(yīng)力、應(yīng)變、位移和安全系數(shù)的分析，校核活塞和后接頭所選材料的強度是否滿足擠密鉆進的使用要求。
[Abstract]:China's urbanization process is gradually speeding up, available land resources are becoming increasingly tight, more pipelines will be laid to the city underground, so that urban traffic. The three-dimensional communication has become an important development direction of urban construction in the future. The traditional underground pipeline construction method has a great impact on the traffic and environment on the ground, at the same time. Compared with the traditional underground pipeline construction method, the non-excavation construction technology has the advantages of short construction period, strong applicability, good security and less interference to the ground. Because of the advantages of low cost, non-excavation construction technology has been widely used in the field of basic construction in China, and has brought a large number of research and development of non-excavation construction technology related equipment. As one of the construction techniques, the pneumatic impact spear method can quickly form holes in the soil of different strata, and the quality of the holes is better. The controllable pneumatic impingement spear has the controllability of motion, that is, it can realize the function of free forward and backward. By comparing the air distribution and structure principle of pneumatic impact spear at home and abroad, the structural characteristics of different types of impact spear are studied and analyzed, and combined with the requirements of construction technology, a bi-directional locking controllable impact spear is designed. According to the elastoplastic mechanical properties of the actual soil, by adjusting the valve stroke and air source pressure of the piston movement of the pneumatic impact spear, the impact frequency and the impact energy of the impact spear can be matched with the strata and soil, so that the speed can be achieved. In order to ensure the stable and reliable working state of the impact spear, the locking adjusting mechanism is added in the structural design of the impact spear. Floating seals and split compaction bits. According to the air distribution mode and structure principle of pneumatic impact spear, based on the theory of gas thermodynamics and dynamics, the simulation program of piston motion is designed and compiled by Visual Basic language. The dynamic characteristics of the internal piston of the pneumatic impingement spear are studied and analyzed by the program, the motion law of the piston is grasped, the main design parameters of the internal impact mechanism are analyzed, and the optimum configuration of the parameters and the regression analysis are carried out. The optimum structure size and impact performance parameters of pneumatic impact spear are calculated. The static stress, strain, displacement and safety factor of piston and rear joint of pneumatic impact spear are analyzed by using finite element analysis software. Check whether the strength of the material selected for piston and rear joint meets the requirements of squeeze drilling.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU62;P634.4

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本文編號：1467403