A trenchless reaming machine, a reaming drill bit and a reaming method thereof

Abstract

The invention relates to a non-excavation hole reaming machine, a hole reaming drill bit and a hole reaming method. The reaming machine includes a reel system, a positive and negative circulation system and a hydraulic power drive system, which has two operating modes of positive and reverse circulation. The reaming bit is equipped with cutting teeth and a slag suction port connected to the suction pipe of the above-mentioned non-excavation reaming machine, and the reaming requirements can be completed in one reaming, which reduces the disturbance of the soil around the hole wall by reaming step by step. The risk of hole wall collapse is reduced, and the risk of failure of the dragging pipeline due to the inability to completely remove the poor fluidity soil in the hole due to the traditional non-excavation hole reaming and hole cleaning process is avoided. The steps of the reaming method provided by the invention are opening the pilot hole, reaming the hole once and pulling the pipe back, which improves the working efficiency, reduces the construction consumption, reduces the water consumption, and the separated soil can be loaded and transported away to control pollution. The environmental pollution caused by repeatedly transporting out the slag is reduced, and the cleaning workload is reduced.

Description

technical field [0001] The invention relates to a construction technique for non-excavation pipeline laying, in particular to a non-excavation reaming machine, a reaming drill bit and a reaming method thereof. Background technique [0002] At present, the construction principle and process of traditional horizontal directional drilling trenchless pipeline laying are as follows: firstly, the horizontal directional drilling machine digs the pilot hole according to the pipeline design trajectory, then expands the hole step by step, then performs the hole cleaning process, and finally pulls the pipe back. The disadvantages of the traditional horizontal directional drilling trenchless pipeline laying process are as follows: [0003] 1) The step-by-step reaming process is inefficient. Generally, a pipe with a diameter of 1200mm is generally reamed to 1400-1500mm, and generally requires 200, 300, 400, 500, 600, 700, 800, 900, 1000, 1100, 1200, 1300, 1400, 1500 step-by-step reaming...

AI Technical Summary

Problems solved by technology

[0004] 2) The cleaning process is inefficient

[0005] 3) High construction risk

Therefore, the mud in the hole is the biggest risk source for the failure of the non-excavation pullback pipeline. Usually the PE pipeline is broken or flattened, and the steel pipe is squeezed in the hole and cannot be pulled. 90% of the reasons for the failure of these pipes come from the step-by-step hole expansion and hole cleaning process. It is impossible to accurately judge the amount of remaining mud in the hole, and the degree of mud accumulation when pulling back the pipeline

[0006] 4) Large consumption of water

[0007] 5) Difficult to control mud pollution

The successful experience of the back-towing pipeline requires that the back-towing pipeline cannot be stopped for 24 hours, and the shorter the time for the back-towing pipeline, the better. This makes it difficult to thoroughly clean and transport the mud in the back-towing pipeline, and it is difficult to control the pollution of the mud

[0008] 6) In the whole process of reaming, cleaning and pulling back the pipeline, the workload of clearing and transporting mud is heavy

[0009] 7) It is impossible to carry out the construction of the pebble layer and the backfilling layer of construction waste

Therefore, the non-excavation construction team is not sure about the success of the pebble layer construction. The main reason is that only the soil is stirred into mud to be extruded in the reaming hole, and the pebbles are deposited at the bottom of the hole, and it is difficult to squeeze out of the hole with the mud, resulting in jamming. The drill bit is stuck, and the pull-back pipe is stuck, making this formation a difficult problem that cannot be solved in trenchless construction

Although there is chemical mud application, it cannot eliminate the risk that the pebbles in the hole will not be cleaned and bring back to the pipeline.

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