Multi-pipe high-pressure jet grouting pile construction method: Fid-Bau Portal

Multi-pipe high-pressure jet grouting pile construction method

LI HAIHONG

The invention discloses a multi-pipe high-pressure jet-grouting pile construction method, which relates to the technical field of jet-grouting pile construction, and comprises the following steps: improving a triple-pipe jet-grouting pile machine, adding a second compressed air pipe and a jet pipe for transverse jetting, the multi-pipe high-pressure jet grouting pile machine is formed, a drilling machine is used for positioning and drilling, multi-pipe high-pressure jet grouting pile construction is carried out, the multi-pipe high-pressure jet grouting pile machine is controlled to lift a drill rod, and multi-pipe high-pressure jet grouting pile construction is completed. According to the method, the number of hole channels of a pipeline structure in the multi-pipe high-pressure jet grouting pile machine is increased, two pipe holes are added on the basis of three pipe holes of gas, water and cement grout, under the same geological condition, high-pressure jet flow repeatedly cuts a soil body for multiple times, and then the pile forming diameter is increased; under the same geological condition, the newly added jet pipe can select any medium in high-pressure water or cement paste for jet flow according to different construction geologies, the cement paste with a large water-cement ratio can be jetted at high pressure, and the construction flexibility is high.

本发明公开了多管高压旋喷桩施工方法，涉及旋喷桩施工技术领域，包括以下步骤：改进三重管旋喷桩机，新增第二道压缩空气管和新增射流管进行横向喷射，形成一个多管高压旋喷桩机、钻机定位及钻孔、多管高压旋喷桩施工和控制多管高压旋喷桩机进行提升钻杆，完成多管高压旋喷桩施工；本发明方法多管高压旋喷桩机中的管道结构的孔道数量有所增加，在气、水、水泥浆液三个管孔的基础上增加了两个管孔，在同样地质条件下，实现高压射流重复多次切割土体，进而增大成桩直径；在同样的地质条件下，新增射流管可根据施工地质的不同选择高压水或水泥浆中的任意一种介质进行射流，可高压喷射大水灰比的水泥浆，施工灵活性高。

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