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(1 同濟(jì)大學(xué)結(jié)構(gòu)工程與防災(zāi)研究所，上海 200092； 2 上海市政工程設(shè)計(jì)研究院，上海 200092)

［摘要］在大型深基坑開(kāi)挖過(guò)程中，常需要利用基坑的支護(hù)結(jié)構(gòu)，建造用于方便現(xiàn)場(chǎng)車(chē)輛交通及基坑施工的棧橋。棧橋可以有多種結(jié)構(gòu)形式，較為常見(jiàn)的一種是以基坑的混凝土支撐為主梁，以現(xiàn)澆混凝土板為橋面板的棧橋。這種棧橋的上部結(jié)構(gòu)需要經(jīng)過(guò)仔細(xì)計(jì)算和設(shè)計(jì)。以一個(gè)實(shí)際工程為例，應(yīng)用ANSYS軟件，建立棧橋的結(jié)構(gòu)模型，詳述了各相關(guān)部分的設(shè)計(jì)與驗(yàn)算方法，指出棧橋施工應(yīng)注意的一些問(wèn)題。分析表明，棧橋不會(huì)對(duì)支撐結(jié)構(gòu)的受力性質(zhì)產(chǎn)生過(guò)大的影響，可因地制宜地進(jìn)行設(shè)計(jì)應(yīng)用，優(yōu)化基坑的施工過(guò)程。

［關(guān)鍵詞］深基坑；棧橋；支撐；橋面板

Design and construction of a temporary trestle bridge spanning a deep foundation pit in Changping pump station storage pool project

Ren Donghui 1, Gao Piqin 2

 (1 Research Institute of Structural Engineering and Disaster Reduction, Tongji University, Shanghai 200092, China; 2 Shanghai Municipal Engineering Design Institute, Shanghai 200092, China)

Abstract:During the excavation of a large and deep foundation pit, a trestle bridge is usually needed to build to facilitate the on-the-spot transportation and the foundation pit construction by virtue of the support structure of the pit. The bridge can be of many different structures, a common one of which is using the concrete support of the pit as its girder and cast-in-situ reinforcement concrete plates as its decks. The superstructure of this kind of bridge needs careful calculation and design. This article takes an actual project as an example, builds the structural model of a trestle bridge using FEM software ANSYS, and recounts the design and checking approach of each correlative part. In the end, some problems about the trestle bridge construction that should be paid attention to are also pointed out. Analysis shows that trestle bridge will not affect the mechanical property of the support structure so much. Therefore appropriate trestle bridges should and could be designed and applied according local conditions to optimize the construction process of foundation pits.

Keywords:deep foundation pit；trestle bridge；support；bridge deck