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人工挖孔桩施工中,常遇到以下一些难题。这些疑难如果处理不当,不仅费工费料,影响工程进度,而且会造成质量事故和永久性工程隐患。一、挖孔桩护壁挖孔桩护壁混凝土可分段立模浇筑。但在水位线下浇筑混凝土时,会受到水的干扰。由于护壁较薄,在护壁内灌注混凝土有困难,所以护壁模板的纵断面上、下厚度不能相同。上端口的厚度可以放宽4～8厘米,纵断面呈梯形,便于混凝土从护壁上端口倒入到下端口(如图1)。护壁上端口加宽的
In the construction of manual digging piles, the following problems are often encountered. If these problems are not dealt with properly, it will not only waste labor and materials, affect the progress of the project, but also cause quality accidents and permanent engineering risks. One, digging pile retaining wall digging pile retaining wall concrete can be divided into a vertical mold pouring. However, when concrete is poured under the water line, it will be disturbed by water. Since the wall thickness is relatively small, it is difficult to inject concrete into the wall. Therefore, the vertical and horizontal thicknesses of the wall template cannot be the same. The thickness of the upper port can be relaxed by 4 to 8 centimeters, and the vertical section is trapezoidal, which facilitates concrete pouring from the port on the retaining wall to the lower port (see Figure 1). Widening of the port on the retaining wall