JP2013087515A5 - - Google Patents

Description

The perforating apparatus 100 is fixed to an adjacent untreated soil retaining pile 1a by a fixing tool (an anchor bolt or the like) . After the drill core 14 is rotated by the drill body 15, the operator lowers the drill carriage 13 using the handle of the drill carriage 13, so that the drill core 14 drills the predetermined work hole 3. It is necessary to make the depth of the working hole 3 longer than the length of the retaining pile for cutting and removing. In the subsequent process of jetting high-pressure water inside the pit, the concrete debris with high specific gravity generated by the process cannot be discharged depending on the flow of water, and it is necessary to temporarily accumulate the debris It is. In addition to the length of the length to be cut and removed, it is desirable to add a depth that can secure 1.3 to 1.5 times the volume of concrete crushing waste.

Before performing the processing by the high-pressure water processing apparatus 200, an iron plate for curing is embedded in the side surface of the retained pile 1a so that the high-pressure water does not affect the surroundings. After that, the high-pressure water processing apparatus 200 is first fixed to the adjacent unsettled retained pile 1a with a fixture (an anchor bolt or the like) . The height of the high pressure water jet nozzle 21 is finely adjusted by a handle on the supply pipe carriage 26, and the high pressure water jet nozzle 21 is moved to a predetermined cutting position. By driving the supply pipe rotation motor 29, the high-pressure water supply pipe 24 including the high-pressure water jet nozzle 21 is rotated at a speed of about 20 times per minute. Thereafter, the high-pressure water from the high-pressure water generator is passed in the order of the high-pressure hose 28, the rotary universal joint 27, the high-pressure water supply pipe 24, and the nozzle body 22 with the rectifier in the radial direction of the residual pile 1a. The disc-shaped removal space 6 is formed by crushing the non-ferrous portion such as concrete of the retained pile 1a for earth retaining with the water pressure. As high-pressure water, about 18 [MPa] used for normal water jet work is supplied about 40 [l / min]. Accumulates at the bottom of the working hole 3.

In the high-pressure water jetting process that crushes concrete with high-pressure water, vibrations are significantly reduced as in the drilling process, and noise can be dealt with by taking local noise countermeasures. By using it, the generation of dust can be suppressed and the working environment can be prevented from deteriorating. In addition, since only the upper surface of the retained pile 1a is exposed, the high pressure water processing apparatus 200 can be installed to crush concrete and the like, so there is no buried object around the retained pile 1a. Work can be done regardless.