A Partially Unbonded Tunnel Composite Anchor System and Method

Abstract

The invention discloses a partial non-bonded tunnel type compound anchorage system and method. The system comprises a concrete anchorage body, a pulley system and multiple fastening ropes. The pulley system comprises multiple pulleys, tensioned steel plates and I-shaped steel. The pulleys are fixed through the tensioned steel plates. The I-shaped steel is welded to the rear ends of the tensioned steel plates. Each pulley is fixed between every two tensioned steel plates. The portions, connected with the concrete anchorage body, of the tensioned steel plates are provided with non-bonded parts in a set region. The fastening ropes penetrate the concrete anchorage body and are anchored to the concrete anchorage body. The partial non-bonded tunnel type compound anchorage system has the beneficial effects that the structural mode of a tunnel type anchorage is optimized, a conic anchorage is changed into the trapezoidal anchorage, and multiple inhaul cables can be anchored at the same time. Under the condition that the same number of the inhaul cables are anchored, the size of the anchorage system is effectively reduced. The bearing and tensioning limits of the concrete anchorage are increased. The work amount is greatly reduced, and disturbance to the environment is reduced.

Description

technical field [0001] The invention relates to a tunnel-type composite anchor system in bridge engineering, in particular to a partially unbonded tunnel-type composite anchor system and method. Background technique [0002] Since the 21st century, with the vigorous development of the national economy and transportation, long-span bridges have been widely constructed, and suspension bridges are the most important form of long-span bridges. Modern suspension bridges are composed of bridge towers, anchorages, main cables, suspension cables and other parts. Anchorage systems are generally divided into gravity anchorage, tunnel anchorage, soil anchorage and structural self-anchoring systems. Among them, the tunnel anchorage has reasonable structural force, small engineering quantity and low engineering cost, which cannot be replaced by other anchorage systems. Tunnel anchors are generally used in places with fewer joints and better rock mass performance. The huge horizontal t...

AI Technical Summary

Problems solved by technology

However, both actual engineering and numerical simulations have found that such a structural form has deficiencies.

The tapered anchorage has a large volume and cannot anchor multiple cables. In the case of a large tension on the cables, it is easy to cause the anchorage to fail due to excessive local stress, and then damage the anchorage.

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