Slurry for cross-sea bridge drilling pile drill construction and pulp making method

Abstract

The invention discloses slurry used for the drilling construction of a sea-spanning bridge drilling pile, which comprises the following components: 13.5 to 16.6 percent of sea mud, 81 to 83 percent of seawater, 0.15 to 0.2 percent of slurry admixture, 1 to 3 percent of swell soil, as well as 0.4 to 0.5 percent of calcined soda; wherein, the percentage is the weight percentage; the preparing method of the slurry is as follows: the slurry admixture and the calcined soda are uniformly stirred to form the comprehensive material of the slurry admixture and the calcined soda; then after the swell soil is added into a stirring machine, the comprehensive material of the slurry admixture and the calcined soda is added and stirred uniformly; then the sea mud is added; the stirring machine is adjusted to a low-speed gear; the seawater is slowly added simultaneously when stirring; slow speed stirring is carried out for 3 to 5 minutes at first, then high speed stirring is carried out for 10 to 15 minutes, thus leading various materials to be completely decomposed and molten.

Description

technical field [0001] The invention relates to mud used in the drilling process of cross-sea bridge bored piles and a slurry-making method thereof. Background technique [0002] In pile foundation drilling construction, because the specific gravity of mud is greater than the density of water, the hydrostatic pressure of mud is greater than that of water for the same high water head in the pile casing. Under the action of hydrostatic pressure, the mud can act on the hole wall around the borehole to form a layer of mud skin to block the seepage outside the hole and protect the hole wall from collapse. In addition, the mud also plays the role of suspending drilling slag, which can smoothly remove drilling slag and make the drilling speed normal. However, the pile foundations of sea-crossing bridges or wharves have complex geology, large pile diameters, and long piles. When drilling bored piles at sea, due to the influence of ebb and flow, erosion and silting are carried out i...

AI Technical Summary

Problems solved by technology

However, the pile foundations of sea-crossing bridges or wharves have complex geology, large pile diameters, and long piles. When drilling bored piles at sea, due to the influence of ebb and flow, erosion and silting are carried out interactively, requiring the mud used for drilling to have High stability and good anti-seepage performance can ensure a good hole-forming effect in pile foundation construction. Commonly used ordinary yellow mud, bentonite and other slurry-making materials will undergo chemical changes soon under the action of seawater and sea mud. The colloid is denatured and precipitated, and the relative density and drilling degree of the mud cannot meet the requirements, and even the separation of water and mud occurs. The mud on the upper part of the pile hole quickly settles into clear water, and the mud skin cannot be formed to protect the hole wall, which is easy to cause damage during construction. The hole wall collapsed, affecting the construction progress and even endangering the construction safety

In addition, the piles of the main bridge of the bridge are generally far away from the coast, and it is difficult to build a large mud pool. If the usual slurry making method is used, not only the fresh water consumption is large, the transportation cost of ships and cars is high, but also it is easy to cause secondary pollution to the environment