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在南高加索的一条山区河流上,当修建金属管椿桥墩的桥梁时,由于碰到坚石表面层而不可能打椿。设计单位提出分节建造的沉井设计,又由于施工复杂和造价很高,也没有被采用。现场施工人员建议使用一种木箱围堰结构,这种木箱围堰能用于抽水、沉到岩石类土壤中和在天然地基上浇筑混凝土基础。木箱围堰的结构如图1,按照基础的大小,用14×14的枋材制造三个内框1,内框的四角用半剖叠接法紧密联接;三个内框在高度方面的位置距离为2公尺。在和内框位置相同的水平位置上设置直径为15～16公分的圆木做成的外框2,外框内侧砍平,并在外框四角用半剖叠接法联接。内框和外框之间的距离为50公分。在内、外框的中间,在相同的平面上设置10×10枋材制成的附
On a mountain river in the South Caucasus, when building a bridge of metal tube ponton pier, it is impossible to hit the bridge due to the surface of the stone. The design units proposed sub-section of the caisson design, but also because of the construction complexity and high cost, it has not been used. The site builders recommended the use of a wooden box cofferdam that can be used for pumping water, sinking into rocky soils, and pouring concrete foundations on natural foundations. Wooden cofferdam structure shown in Figure 1, according to the size of the base, with 14 × 14 made of three inner frame 1, the four corners of the inner frame with half-split connection closely linked; three inner frame in height The distance is 2 meters. In the same horizontal position as the inner frame, the outer frame 2 made of roundwood with a diameter of 15-16 cm is arranged, the inner side of the outer frame is cut flat, and the four corners of the outer frame are connected by the half-split connection method. The distance between the inner frame and the outer frame is 50 cm. Inside and outside the middle of the frame, set in the same plane 10 × 10 制 made of materials attached