Prefabricated and assembled frame pier with large cross beams and high stand columns and construction method

Abstract

The invention provides a prefabricated and assembled frame pier with large cross beams and high stand columns and a construction method. The frame pier comprises a foundation, a bottom section pier column, a middle section pier column and a cross beam; when the foundation is constructed, steel bar embedded pipes and embedded thick steel bars are arranged, and joint notches are formed; a transition section is arranged below the bottom section pier column during prefabrication, thick steel bar reserved hole channels and sealing anchors are arranged in the transition section, connecting steel bars extend out of the bottom face of the bottom section pier column, and steel plate connecting pieces are embedded in the top face of the bottom section pier column. During prefabrication of the middle-section pier column, steel bar embedded pipes are arranged at the bottom, connecting steel bars are arranged at the top, and steel plate connecting pieces are embedded; when the cross beam is prefabricated, extending columns are arranged at the positions corresponding to pier columns, steel bar embedded pipes are embedded, and steel plate connecting pieces are embedded. The foundation is connected with the bottom-section pier column through thick steel bars and main bars, the bottom-section pier column is connected with the middle-section pier column through connecting steel bars and steel plate connecting pieces, and the middle-section pier column is connected with the cross beam through the connecting steel bars and steel plate connecting pieces. The structure effectively ensures the strength and durability of each joint, and is suitable for the prefabricated assembled frame pier adopting large cross beams and high stand columns.

Description

technical field [0001] The invention relates to the field of bridge construction, in particular to a prefabricated assembled frame pier with large beams and high columns and a construction method. Background technique [0002] Projects such as railways, municipalities, and highways often intersect with existing railways and roads at small angles. If one-span bridge spanning is used, a larger span is often required. If frame-type piers are used, frame piers are used to cross obstacles, and then the frame piers are used to cross obstacles. Small-span beams such as simply supported beams are set above the pier, which avoids the setting of long-span structures and has better economy. [0003] In the past, frame piers were often constructed by cast-in-place construction, and the pier columns and beams were constructed by the support method. When the frame pier height is high, the support erection height is high, the construction risk is large, and the construction interference is...

AI Technical Summary

Problems solved by technology

[0003] In the past, frame piers were often constructed by cast-in-place construction, and the pier columns and beams were constructed by the support method. When the frame pier height is high, the support erection height is high, the construction risk is large, and the construction interference is large; the pier columns and beams are sometimes hoisted by steel structures , but there are high costs, heavy post-maintenance workload, and difficult maintenance, and when the length of the beam is long and the height of the pier is high, the joints between the beam and the pier column are subjected to complex forces, and the steel-concrete connection structure is difficult to handle

At the same time, the cross-bridge direction of the frame pier is subject to the superstructure dead load, live load, concrete shrinkage and creep, temperature, etc., and is often in a state of large eccentric tension, especially when the frame pier has a large span and a high column height. The stress is relatively large, which is often a weak part. Once cracks occur, the cracks should be opened under the action of dead load and repeated live load of the upper structure. If the cracks expand to a certain width, the durability of the joints will be affected, thereby weakening the connection ability. , affecting the structural safety

Currently commonly used connection methods such as sleeve grouting cannot solve the problem of joint cracking and cannot guarantee the durability of the joint

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