A kind of underground structure and construction method of tunnel cover bridge passing through bad geological conditions

Abstract

An unfavorable geological body crossing tunnel casing bridge underground structure and a construction method thereof belong to the field of tunnel engineering. The unfavorable geological body crossingtunnel casing bridge underground structure comprises a primary lining system, a casing bridge structure and a second lining. The construction method comprises that pipe pieces are embedded onto steeltube arches through grooves, the steel tube arches are connected with first-type support piles through diameter-variable connectors, grade beams are poured on the connecting parts of the first-type support piles, the diameter-variable connectors and the steel tube arch to form the primary lining system; second-type support piles are between the grade beams on both sides of an excavated section, capping beams are poured at the tops of the second-type support piles, a layer of rubber cushion is laid on the capping piles, box girder inverted arches are hoisted onto the rubber cushion to form a casing bridge structure; the primary lining system and the casing bridge structure are connected in a poured mode through the box girder inverted arches and prefabricated reinforcing bars of the gradebeams on both sides; the second lining is poured to form the unfavorable geological body crossing tunnel bridge casing underground structure. The unfavorable geological body crossing tunnel bridge casing underground structure and construction method thereof can cross unfavorable geological bodies such as karst caves, underground rivers and soft ground, and meanwhile, can effectively transfer surrounding rock pressure, reduce deformation of tunnels and ensure construction safety.

Description

technical field [0001] The invention belongs to the technical field of tunnel engineering and is suitable for karst caves, underground rivers and weak foundation tunnel projects in karst areas. Background technique [0002] China's karst landforms are widely distributed and have many types, which are rare in the world. With the vigorous development of railways and highways, it is inevitable to build tunnels in karst areas. According to research, my country is building and will continue to build a large number of railway tunnels and road tunnels in karst areas. During the construction of tunnels in karst areas, it is inevitable to encounter geological disasters such as suspended underground caverns (that is, karst caves), underground rivers, and weak strata. Especially when tunnels pass through rich water-filled karst caves, such tunnels often It is weak and broken, and the geological conditions are extremely poor, which brings great harm to the construction and operation of...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide an underground structure and construction method for crossing bad geological tunnels and bridges to solve the problems of tunnels crossing karst caves, underground rivers, inverted arch uplifts, poor stability of surrounding rocks, and large settlements in weak strata.

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