Hard rock and bare rock river bed trestle for deep water high pier and long span bridge construction and construction method

Abstract

The invention discloses a solid-stone bare-rock riverbed trestle used for the deepwater high-pier long-span bridge construction and a construction method thereof. The trestle includes a trestle body and a horizontal work platform located on the front side of the trestle body. The trestle body includes a lower-portion support structure, a main beam and a bridge deck; the lower-portion support structure includes one or more steel abutment anchoring piles, the lower portions of the steel abutment anchoring piles are anchored to a bare-rock riverbed, the front end of the main beam is supported ona steel cofferdam, the rear end of the main beam is supported on a shoreside surpport platform, and a concrete pumping pipe is placed on the bridge deck; the horizontal work platform is set up on thesteel cofferdam and is connected with the main beam, and each steel abutment anchoring pile includes a groined steel abutment and a steel abutment anchoring structure. The method includes the steps of1, construction of the steel abutment anchoring piles, 2, erecting of the main beam and 3, paving of the bridge deck. The solid-stone bare-rock riverbed trestle is reasonable in structural design, easy to construct and good in use effect, the steel abutment anchoring piles are stably supported on the bare-rock riverbed, the front end and rear end of the main beam are supported on the steel cofferdam and the shoreside support platform respectively, and labor and time are saved.

Description

Technical field [0001] The invention belongs to the technical field of bridge construction, and in particular relates to a solid rock and bare rock riverbed trestle bridge and a construction method for deep-water, high-pier and large-span bridge construction. Background technique [0002] With the development of the national economy, my country's railway bridge industry is developing rapidly. my country is catching up with or approaching the world's advanced level in bridge design theory, construction technology and equipment. The construction of large-span sea-crossing and river-crossing bridges is increasing. During the construction of the underwater piers of deep water, high piers, and long-span bridges, when the riverbed is a rocky and bare rock bed, the construction of the underwater piers is more difficult, and trestle bridges are usually erected. Among them, "deep water" means that the water depth of the bridge foundation is above 5m-6m, "high pier" means that the height o...

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Problems solved by technology

In the deep water exposed hard rock river bed and current state, it is impossible to install the steel casing for pile foundation construction and carry out mud circulation, and it is difficult to build a drilling platform. Therefore, it is difficult to use the traditional method of inserting steel sheet piles for construction or ordinary percussion drilling to form holes. , the anchoring of the trestle pier is a big problem; if the method of pouring underwater concrete to wrap the steel pier is used, the box-type formwork needs to be installed, the amount of concrete pouring is relatively large, and the construction quality is not easy to control, and the anchoring effect of the steel pier is poor. It is difficult to guarantee the stability of the steel pier in the case of flood discharge from the upper reaches of the Minjiang River during the flood season, and after the trestle bridge is used, it is necessary to use the blasting excavation method to remove the concrete to the original riverbed surface according to the relevant regulations of the channel and water conservancy department

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