A method of assembly-type construction of open-cut underground building structures

Abstract

The open-cut underground building structure assembly construction method of the present invention does not need to erect a temporary support system, and the temporary support system in the existing construction method is replaced by each floor plate in the permanent structure station, including the top plate, the floor plate and the bottom plate, Eliminate support removal, save a lot of waste of temporary materials, avoid structural instability caused by the change of structural force system caused by support removal and replacement, change the longitudinal beam system of the existing station structure to vertical and horizontal integrated force, and the structure is completed at one time , simple and clear, safe and reliable.

Description

technical field [0001] The invention relates to a construction method of a subway station, in particular to an energy-saving and environment-friendly subway construction method with self-supporting subway structure, no external support and no demolition. Background technique [0002] At present, the construction method of underground stations of urban rail transit in most cities in my country adopts the open-cut method, which is basically a construction system consisting of enclosure structures, internal supports and temporary columns. The construction is composed of support structure and support system. After the excavation of the earthwork in the foundation pit is completed, the floor waterproof layer and the floor structure are constructed, and the support is removed layer by layer, scaffolding, formwork, steel bars, and concrete are poured. After completing the construction of the roof structure and waterproof layer, backfill the roof with soil and restore road traffic. R...

AI Technical Summary

Problems solved by technology

The main technical problems of the open cut method are as follows: (1) The station enclosure structure is generally a temporary structure, which also serves as a permanent structure when participating in anti-floating, and needs to be lined. (2) The support system in the foundation pit of the station needs to erect a large number of concrete supports and steel pipe supports, which cannot be used as the main structure. It needs to be dismantled after the construction of the main structure, resulting in the conversion of the structural mechanics system, and sometimes additional steel supports are required. Support conversion, concrete support removal requires labor and materials, causing environmental pollution, steel pipe supports are used repeatedly, and corrosion and instability also occur, and large-scale mechanical transportation and hoisting are required for disassembly and assembly, resulting in waste gas and energy consumption, occupying the construction site. The construction of the main structure caused a lot of trouble; (3) The construction of the main structure required the erection of a large number of scaffolding and formwork, and there were often leaks in the formwork assembly, which affected the overall self-waterproof quality of the main body concrete. and transportation, which brings many disadvantages to the construction of underground stations; (4) There are errors in the on-site production, processing, and binding of steel bars, and the reinforcement in the intersection area is dense, which affects the quality of concrete, and the quality of steel bar connection and welding is difficult to control; (5) The main structure is cast-in-place Vibration is required, and the requirements for concrete workability and fluidity are high, which adds many difficulties to the temperature control, cracking and maintenance of large-volume concrete; (6) The existing construction technology is labor-intensive, technical standardization, integration and automation are low, and the process Poor connection, low efficiency and high consumption, and poor civilized construction; (7) The overall construction technology cost is high, which does not meet the current national policy of vigorously developing the industry-prefabrication assembly requirements, and the promotion prospect is poor

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