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一、前言钢丝网水泥具有抗裂性能高、弹性好、重量轻、造价低等一系列优点,所以它被广泛用于农船、水利及建筑工程中。近年来也有在地下工程中用作衬套结构。不过目前的衬套大都是采用传统的双层钢丝网,单层同的钢丝网水泥构件虽也有试用,但尚无系统的试验资料,在设计中应用缺乏科学依据。为探明单网钢丝网水泥受力特点与破坏机理,验证单网衬套的刚度、强度、安全度,确定不同用途衬套截面形式,以便为在地下工程中应用提供设计依据,浙江省人防工程设计科研所和同济大学地下建筑教研室等单位共同合作,自1983年10月至1985年10月进行了3.6米至12米跨度的单网钢丝网水泥槽型拱、球壳、幕式结构及折线拱等一系列结构试验,并在截面选型、强度计算、施工工艺和施工机具等方面已取得一些成果。现将3.6米跨度双铰拱试验研究的主要情况简介如下。
I. INTRODUCTION Wire mesh cement has a series of advantages such as high crack resistance, good elasticity, light weight, and low cost, so it is widely used in shipbuilding, water conservancy, and construction projects. In recent years, it has also been used as a liner structure in underground works. However, most of the current bushings use the traditional double-layer steel wire mesh. Although the single-layer wire mesh cement components have trials, there is no systematic test data and there is no scientific basis for their application in design. In order to verify the stress characteristics and failure mechanism of single-web steel wire mesh cement, the rigidity, strength and safety of single-wire bushings were verified, and the cross-section form of bushings for different purposes was determined in order to provide design basis for application in underground engineering. The Engineering Design Research Institute and the Tongji University Underground Building Teaching and Research Office and other units cooperated and conducted a single-mesh steel wire mesh arch with a span of 3.6 to 12 meters from October 1983 to October 1985. A series of structural tests such as broken line arches, and some achievements have been made in section selection, strength calculation, construction technology, and construction equipment. The main conditions of the 3.6-meter span double-hinge arch test study are summarized below.