Method for constructing energy-saving underground tube structure

Abstract

The invention relates to a method for constructing an energy-saving underground tube structure, which belongs to the technical field of underground structures and solves the technical problems of reducing the construction cost, shortening the construction period, improving the site selection flexibility of structures and controlling the effect of construction on surroundings. The method comprises the following steps: drilling a center bore by the slurry hole-boring method, reaming the bore to reach a designed bore diameter, putting the cylindrical steel mould of a first tube section into the hole with a hoisting machine and ensuring the cylindrical steel mould to suspend on the mud level, binding reinforcing steel bars and pouring concrete in the steel mould, wherein the tube section is in the suspended state after the operation of the first tube section; and pouring tube walls by using sliding formworks from the second section until the pouring of the whole tube wall is finished. the extra weight of the total tube body weight to buoyancy force after the second section is completed is balanced by lifting force of a plurality of hoisting machines at the bore. After the tube wall of the third section is poured, the buoyancy force is larger than the gravity of the tube body, and the hoisting machines play a role of stabilizing the tube body. The method provided by the invention is applicable to rock layers with various properties and is suitable for the construction in areas with dense urban structures.

Description

technical field [0001] The invention relates to the technology of underground structures, in particular to the technology of a construction method of resource-saving underground cylinder structures. Background technique [0002] At present, the construction methods of ultra-deep and super-large-diameter underground barrel structures mainly include "wellbore segmental prefabrication combined with buoyancy splicing and sinking method" (referred to as "segmented prefabricated splicing and sinking method") and "caisson method". [0003] "Segmented prefabricated splicing and sinking method" is a construction method for assembling and sinking prefabricated tube sections with the aid of the buoyancy of the mud in the hole after forming a hole with a drilling rig; this method is suitable for various stratum conditions, and the construction depth of the structure can be very large. The installation efficiency of the barrel is high and the cycle is short; when building a well in a sof...

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Problems solved by technology

[0004] The "caisson method" is a construction method in which the self-weight of the cylinder overcomes the frictional resistance of the surrounding soil to make it sink to the design elevation; this method needs to consider the self-weight and correction required by the cylinder to overcome the resistance of the side wall of the sinking during design. The required rigidity of the cylinder makes the design wall thickness of the cylinder and the steel content of the reinforcement larger, and its structural cost is relatively high. It is only suitable for construction on soft ground, and its construction period is long; this method still has The well depth is shallow, the mud pool required for slurry discharge has a large area, and the verticality of deep wells is difficult to correct. For structures with large diameters, it is often necessary to design measures to support partitions, so the construction cost is high; In addition, Construction using the "caisson method" will affect the surrounding environment, causing ground subsidence, underground pipeline displacement, road cracking and other phenomena in the surrounding area, and the greater the sinking depth of the structure, the more obvious the impact on the surrounding settlement. It is suitable for construction in areas where urban buildings (structures) are concentrated, and the reinforced concrete floor of the underground structure of the caisson method is post-cast, and the anti-seepage treatment of the joint surface with the wall is relatively difficult

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