Method for reinforcing bridge special-shaped pier stud by prestressing tendons

Abstract

The invention discloses a method for reinforcing a bridge special-shaped pier stud by prestressing tendons. The method comprises a method for reinforcing a cantilevered area in a portal type pier studwith inclined struts. The specific steps are as follows: S1, construction preparation, S2, measurement and staking-out, S3, constructing a temporary buttress and arranging a scaffold, S4, sealing surface cracks, S5, jacking and unloading, S6, installing pressure plates, S7, embedding steel bars, S8, installing a prestressing device, S9, making an installation template, S10, concrete pouring , S11, prestressing tensioning, S12, grouting and sealing, S13, restoring a beam body, S14, and demolishing the scaffold and the temporary buttress. By applying the method, the bridge is synchronously jacked up, the method of enlarging the section, the method of external prestressing reinforcement and the method of crack grouting are organically combined, there is no exposed anchorages and steel bars outside the pier stud after reinforcement, the appearance of the reinforced landscape bridge pier stud is basically not affected, and the method can be applied to the reinforcement conditions of urbanlandscape bridges with high requirements on appearance.

Description

technical field [0001] The invention relates to a method for reinforcing special-shaped pier columns of bridges with prestressed tendons. Background technique [0002] At present, concrete piers are widely used in my country's railways and urban roads. With the increase of service life, a large part of ordinary reinforced concrete piers have various degrees of disease, and some of the piers have been seriously damaged. The diseased piers that can still be used can generally be extended through reasonable reinforcement measures. If the new column is replaced, not only the cost is high, but also the normal operation of the traffic will be affected during the replacement process, and the short-term interruption of transportation will also cause economic losses. How to deal with the disease and improve the performance and durability of the bridge without interrupting the transportation is a very important and valuable research topic. For landscape bridge projects, the appearan...

AI Technical Summary

Problems solved by technology

Including: 1. The external prestress is arranged outside the section, so it is relatively difficult to prevent corrosion and protection, and is easily affected by the outside world

2. Stress concentration is easy to occur in the anchorage and steering area, the local stress is large, and the requirements for anchorage construction are high

3. The external prestressed tension force is small, and the advantages of high strength of the external cable cannot be fully utilized, and the requirements for anchors and clips are very high

4. The deformation of the external prestressed tendons is inconsistent with the deformation of the concrete, which is easy to cause the loss of prestress

5. Since the steering device and anchor points are constrained, it is easy to cause vibration of the external cable when driving, and the free length of the prestressed cable is limited

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