How to solve the principle of drilling machine for trenchless pipeline laying?

Trenchless technology first requires technical preparation, which mainly includes the investigation of the current use status of underground pipelines to accurately grasp the distribution of pipelines and other infrastructure; and determine drilling according to the terrain and route of the construction area. The borehole axis is used to survey and measure the regional topography and geomorphology; and the on-site stratigraphic geological survey is carried out in the work area that needs to be drilled.

Then prepare the construction site, install and stack machinery and tools at the construction site; excavate the injection pit, do support and dewatering work; carry out the entry and installation of construction machinery; Probe guidance is carried out with the help of a navigator.

The last step is to carry out guidance construction mainly focusing on opening holes, deflection drilling, and straight-keeping drilling, as well as pull-back expansion including hole diameter design, graded hole expansion, hole wall reinforcement, and pull-back pipe laying. two construction steps.

Extended information:

Construction preparation

1. Construction of pipe jacking work well, with a water collection pit in the well to facilitate the drainage of accumulated water.

2. Set the backrest. After the working well foundation is set, set the backrest according to the direction of the pipeline.

3. Guide rail installation. The firm and accurate installation of the guide rail has a great impact on the jacking quality of the pipe. Therefore, the guide rail installation is determined based on the pipe diameter, pipe slope, and jacking direction. The jacking direction must be flat. Straight, with accurate elevation and axis. The guide rails can be made of lightweight steel rails.

4. The jacking equipment uses a jack with a bladed tool tube on the head, which can cut the soil and protect the pipeline and guide. In order to prevent the soil from collapsing, a grid is installed inside the tool tube.

5. There is a movable working platform above the work pit for other equipment. Generally, No. 30 channel steel is used as the beam and square wood is laid on top. A temporary crane is used to lift the lower tube, and a shaking rocker is used for excavation.

6. Note: Enclosure measures must be taken around the pipe jacking work pit, using color steel tiles, rain canvas protection, and eye-catching warning signs. When jacking in, passing vehicles should slow down and large-tonnage and heavy-duty vehicles are prohibited from passing.

Reference source: Baidu Encyclopedia - Trenchless