A process for horizontal directional drill passing through and tampering casing for separating gravel

Abstract

The present invention relates to piping no dig construction technique. The level orienting drill pass through tamping bushing separation egg gravel technique first need to build a work pit, its improvement is that: it has the following steps: (1) laying rail; (2) mounting tamping pipe hammer; (3) tamping steel bushing; (4) digging out earth from the bushing; (5) mounting a central position pipe. The technique combines the tamping bushing construction technique with the level orienting drill construction technique, solves the problem that the construction can not be proceeded caused by the unsteady of the ground at two ends of earth in and out points in the level orienting drill construction, and has the following characteristics: (1) adapting to piping for multiple earth layers, backfill layers, running sand layers and various gravel containing ground layers. (2) The ground will not generate apophysis or sedimentation phenomenon, the ground layer adaptability is strong, piping speed is fast and can be to 25m/h. (3) the construction occupies small ground. The tamping bushing construction work surface is in the orienting drill pass through drill ground, occupies small ground, has small earth cubic, and convenient in operation.

Description

technical field [0001] The invention relates to a pipeline laying technology, in particular to a trenchless construction technology. Background technique [0002] Since the invention of horizontal directional drilling technology for pipeline crossing engineering in the 1970s in the United States, this technology has been used and developed all over the world. At first, directional drilling technology was only applicable to clay, silt, sub-clay and other geological structures with mud-making ability and easy hole formation, and later developed to rock sections that are not easy to collapse. However, for geological structures such as gravel, gravel sand, and pebbles, it has always been considered a forbidden area for directional drilling construction technology. Once such a geological structure is encountered, the general treatment method is to change the design position or route to avoid crossing such geological areas. However, in the actual construction process, due to the...

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Problems solved by technology

However, in the actual construction process, due to the special geographical location of some gravel or gravel sand areas, it cannot be changed, and the gravel or gravel sand areas must be crossed

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