Percussive drilling construction process for diaphragm wall passing through rock-filled layer in reclamation area

Abstract

The invention relates to a percussive drilling construction process for a diaphragm wall passing through a rock-filled layer in a reclamation area. The process comprises the following steps of: performing setting-out survey and lead wall construction; after the positions of guide holes are determined, first continuously punching main guide holes accommodating pipe joints, from the top side of the diaphragm wall to a depth which is 0.5m greater than a designed depth by using a punch pile machine, and then forming an encrypted main guide hole at the position which is between the two main guide holes and is 1.5m away from each of the main guide holes; after the position of the encrypted main guide hole is determined, performing continuous punching from the top side of the diaphragm wall by using a punch hammer, moving the punch pile machine to a position above the gap between the two main guide holes, then punching the gap between the two main guide holes by using the punching hammer so as to form an accessory hole, and digging soil by using a grooving machine to form a groove; brushing the wall and cleaning the holes; hoisting and installing the pipe joints; hoisting a steel reinforcement cage; lowering down conduits; filling underwater concrete; pulling and reclaiming the pipe joints; and checking the quality of an enclosure structure. Thus, the construction process solves the problem of low work efficiency during the construction of the diaphragm wall under the geological condition of the rock-filled layer, has the characteristics of high work efficiency and good grooving quality, improves the safety of foundation pit construction, and effectively reduces the comprehensive construction cost.

Description

technical field [0001] The invention relates to a construction technique of percussive drilling through an underground continuous wall of a rock filling layer in a sea reclamation area. technical background [0002] With the development of science and technology, in recent years, the construction technology of underground diaphragm wall has been fully developed and applied in soft soil strata such as cohesive soil, sandy soil and flush fill soil in my country. Especially in the near future, with the rapid development of the national economy, the development of underground space in coastal areas has also developed in depth. The construction methods of underground diaphragm wall enclosure structures used in the development of underground space are various. The traditional construction method uses groove walls for soft soil layers The machine directly drills and grasps the trough, and the upper hard and lower soft strata adopt the intensive impact method to form the trough. In...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a construction technology of percussion drilling through the underground diaphragm wall of the rock filling layer in the sea reclamation area, which solves the problem of low construction efficiency of the underground diaphragm wall under the geological conditions of the rock filling layer, and has the advantages of high work efficiency an

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