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Anonymous users2024-02-07The principles of large-section cavern construction are as follows:
The construction method of the large-section cavern is:
The middle hole of the tall section and the left and right sides of the hole are close and parallel, the three-dimensional cross parallel operation, the construction organization is scientific and reasonable, the structure and surrounding rock deformation, and the ground settlement can be well controlled, which reduces the construction safety risk.
The hole structure in the tall section is "overall and local reverse". That is, the primary support structure of the arch part of the cave is constructed first, and the arch part is applied.
two-lining structure; Then carry out the earthwork excavation and steel support installation of the lower part of the middle hole, and then apply the second lining structure (including the middle plate structure) and the steel support removal of the lower part of the middle hole from the bottom to the top, and finally apply the "post-pouring belt".
The middle section of the middle hole arch is excavated at one time, and the connection between the middle section of the middle section of the middle hole arch and the two sides of the molded primary support structure is standardized and fast. The construction technology is simple, the construction is safer and faster, the construction environment has been greatly improved, and the project cost and construction cost have been greatly reduced.
The design and application of the monorail mobile overhead crane (electric hoist) system fundamentally solves the steel support and waist beam steel components.
The transportation and hoisting in the cave solves the problem of the combined application of steel support technology and hole pile method.
The first combined application of the steel support technology and the pile method technology in the middle cave has realized the "longitudinal step" of the substructure of the middle hole
The transverse middle pull groove "full section is excavated at one time.
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Anonymous users2024-02-06April 1, 2011. This paper summarizes the excavation and support construction technology of the large-section flat-topped cavern of the inlet gradient section of the diversion tunnel of Jin'anqiao Hydropower Station, aiming to play a reference role for similar projects in the future. Keywords:
gradient segments; Excavation; support; Reinforcement large section underground cavern excavation support small wave bottom project. Abstract:Large-section underground cavern is an important part of modern large-scale hydraulic buildings.
With the continuous improvement of technology, the construction quality of modern large-scale hydropower buildings in China has been greatly improved, and the construction period has been greatly shortened. This paper is a brief summary of the excavation and support construction of large-section underground caverns.
Author's Affiliation]: China Water Resources and Hydropower Sixth Engineering Bureau****;
Body Snapshot]:
The large-section underground cavern described in this paper is mainly a cavern with a cross-sectional area of more than 50m. When carrying out the construction of this kind of building, different excavation and support construction methods must be adopted according to different geological conditions, different cross-sectional sizes and forms. Same, the use of loaders, the above hydraulic excavators, commonly used are the United States Carter, Japan Komatsu products.
4) Slag transport. Due to the construction conditions, the tunnel was opened.
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