Seawall construction method with top pipes penetrating through block stone

Abstract

The invention relates to a seawall construction method with top pipes penetrating through block stone, which comprises the following steps: 1, treatment of a block stone seawall: reinforcing the seawall section and grouting the seawall; and 2, penetration of the top pipes through a large embankment: setting the air pressure of an excavated compartment, removing large stone blocks, and constructing under the full air pressure to avoid collapse. By adopting the construction method, the top pipes can smooth penetrate through the block grouted embankment, the structure of the filling stones is loosen, and pores and clearances are filled with coarse sand and gravels. Meanwhile, when the top pipes are pushed into the area, the technical problems that the filled block stone layer cannot be balanced or compacted as a result of the air pressure, the upper block stones collapse when being removed, the collapsed funnel is formed, the seawall safety is threatened, and the seawall may be rejected can be solved, and engineering risks can be reduced.

Description

technical field [0001] The invention relates to a construction method for pipe jacking across a seawall, in particular to a construction method for pipe jacking through a seawall whose main components are hard and moderately weathered granite blocks and crushed stones, and the pore filling materials are medium coarse sand and crushed stones. Background technique [0002] According to the design drawings, the elevation of the stone bottom of Huaneng Power Plant’s Huichi seawall is about -19.5m. The elevation distance is about 2.7m. According to the reconnaissance of the Huichi seawall by the survey unit on the pipe jacking axis, the rocks located on the west side of the pipe jacking axis are the deepest, and the rock filling is at 0.00-27.50 meters, and the buried depth at the bottom of the layer is -23.47 meters. It is hard and moderately weathered granite block and gravel, and the pore filling is medium-coarse sand and gravel. The diameter of the rock block is generally 20...

AI Technical Summary

Problems solved by technology

The rock filling structure of the gray embankment is loose, and the pore filling materials are medium-coarse sand and gravel. When the jacking pipe is advanced to this area, the air pressure cannot balance the rock layer that is vibrated and filled. When cleaning the encountered rocks, the upper rocks will be damaged. Collapse, forming a collapse "funnel", endangering the safety of the seawall, and even causing the seawall to be scrapped. If no specific measures are taken, the construction may bring disastrous consequences to the project; therefore, specific measures must be taken before pipe jacking construction to reduce project risks

Images