A method for replacing a bridge support

Abstract

The invention discloses a method for replacing a bridge support, which comprises the following steps: (1) designing and manufacturing a new bridge support and an inlay sleeve in advance; (2) jacking up the beam body after disassembling the nut fastening the anchor rod; (3) Cut the exposed upper anchor rod horizontally along the bottom surface of the upper seat plate of the old bridge support, then pad the lower seat plate of the old bridge support away from the pad stone, and then horizontally cut the exposed lower anchor rod along the surface of the pad stone, After cutting, remove the intermediate body, lower seat plate and upper seat plate of the old bridge support in sequence; (4) After taking out the old bridge support, drop the beam and make a temporary support, and make grooves at the anchor bolts of the pad stone, and adjust the upper and lower anchor bolts. Carry out outer circle repair; (5) Installation of new bridge bearings. The invention replaces the plane connection position and height of the old bridge support without changing, and makes full use of the anchorage system of the old bridge support for anchoring connection after replacement, without weakening the structural strength and anchoring strength of the bridge, and effectively reducing the cost of replacement. cost and shorten the construction period.

Description

technical field [0001] The invention belongs to the technical field of building construction, and in particular relates to a method for replacing a bridge support. Background technique [0002] The bridge bearing is an important support in the bridge structure, commonly known as the "joint" of the bridge structure, which transmits various loads on the upper part of the bridge structure, including the dead load gravity of the beam body itself, vehicle live load and braking force, temperature expansion force, wind force, earthquake force and impact force, etc.; it is also suitable for various translational linear displacements and rotational angular displacements of the beam due to temperature changes and live load changes. [0003] From the early 1980s to the end of the last century, a large number of poorly replaceable bearings were used in bridge structures in my country, including PZ, GPZ series pot bearings and QZ series spherical bearings. Severe corrosion, rubber aging,...

AI Technical Summary

Problems solved by technology

This traditional replacement method has the following defects: (1) Since the old bridge bearings connected by exposed anchor rods are a series of standard products, when the specifications of the bearings are small and medium, the height H of the bearings is low, and at the same time, the pad stone design is not According to the standard, there is a lack of pad stone or low pad stone height, which will result in a small vertical operating space when replacing the bridge support, and it is impossible to drill holes on the bottom surface of the beam body or the top surface of the pad stone, or only shallow drilling can be performed. (2) Due to the bridges built in the early stage, the arrangement of beams, pad stones, and abutments often deviated from the position required by the design, and it was difficult to avoid the affected area when drilling. When the stressed steel bar is drilled and damaged, and when the stressed steel bar is encountered during drilling, a large vibration will be generated, or after the stressed steel bar is drilled, the strength of the reinforced concrete will be weakened and reduced; (3 ) It is necessary to avoid the old bridge support anchor rod when drilling, otherwise the drill bit will be damaged and the strength of reinforced concrete will be seriously weakened. When drilling in the old support anchor rod plane contour line, the support will be displaced The phenomenon of interference and movement of parts and components, and, in order to ensure the design strength of the support, generally speaking, the plane position of the drilling hole cannot be moved inward; when drilling outside the plane contour line of the old support anchor rod, There will be phenomena that the plane contour of the pad stone is too close to the drilling position, and the drilling position is outside the plane contour of the pad stone. Sometimes, the drilling position at the end of the beam body will exceed the edge of the contour. These phenomena need to be padded and Beam end strengthening treatment; (4) The design of the new bridge support needs to be confirmed according to the drilling position or height of the on-site construction, which increases the design and manufacturing cycle of the new bridge support and cannot meet the urgent replacement schedule requirements