Bridge bearing structure passing through huge karst cave and construction method of bridge bearing structure

Abstract

The invention relates to the field of tunnel and underground engineering, in particular to a bridge bearing structure passing through a huge karst cave and a construction method of the bridge bearingstructure. The bridge bearing structure comprises a bridge structure and a protection structure, the protection structure comprises a first supporting beam and a second supporting beam, and further comprises an open cut tunnel structure or a shed tunnel structure, the first supporting beam crosses the karst cave, the two ends of the first supporting beam are arranged on stable foundations on the two sides of the karst cave, the second supporting beam crosses the karst cave, the two ends of the second supporting beam are arranged on the stable foundations on the two sides of the karst cave, thetwo sides of the lower part of the open cut tunnel structure or the shed tunnel structure are fixed to the first supporting beam and the second supporting beam correspondingly, the bridge structure is arranged in the open cut tunnel structure or the shed tunnel structure and crosses the karst cave, and the two ends of the bridge structure are arranged the stable foundations on the two sides of the karst cave. The construction method is used for constructing the bridge bearing structure. Compared with a traditional method for crossing the karst cave through a backfilling method, the karst caveis continuously crossed through prestressed concrete, construction is convenient, the structure is reliable, and the defect of large settling after construction due to tunnel slag backfilling of thehuge karst cave is avoided.

Description

Technical field [0001] The invention relates to a tunnel and underground engineering, in particular to a bridge bearing structure and a construction method for crossing a giant karst cave. Background technique [0002] Since the beginning of the 21st century, with the rapid development of my country’s railway construction, more and more high-standard double-track railways have been constructed at speeds above 200km per hour. Especially in the central and western mountainous areas, the route selection is affected by large curve radii and complex terrain and geological conditions. Restricted by various factors, the scale of tunnels is increasing rapidly, and there are more and more tunnels crossing karst. When the tunnel straddles a large karst cave, it is very likely to cause foundation collapse and structural damage due to the imperfect backfill or suspension of the foundation. Therefore, an effective bearing structure must be adopted to ensure the safety of the tunnel during cons...

AI Technical Summary

Problems solved by technology

[0003] At present, when tunnels span karst caves, waste slag backfilling is generally used to deal with them. However, for giant karst caves, the depth of which is tens of meters or even hundreds of meters. Disorders such as uneven force, cracking and damage seriously affect the operation safety of tunnel engineering

Therefore, it is of great engineering significance and practical value to study a new type of tunnel load-bearing structure with stable and reliable structure, small deformation, and the ability to cross giant karst caves to solve the problems of cracking damage and large settlement of the tunnel structure under the above-mentioned extremely unfavorable conditions.

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