Stretching device of case beam in case

Abstract

The invention discloses a box girder box inside tension device, which is composed of a main structure system, a walk system, an elevating system, and a bearing system. The main structure system is an L-shaped steel structure composed of a plane truss and a vertical truss, and is provided with a balance weight. The walk system is arranged at the bottom of the plane truss. The elevating system is composed of a hydraulic oil cylinder, a chain, pulleys, and an elevating frame. The bearing system is composed of a bearing fork and a jack bracket. The invention adopts the hydraulic oil cylinder to elevate an oil pressure jack for tension, can accurately control the elongation of the hydraulic oil cylinder, is beneficial to the mounting and contraposition work of the oil pressure jack for tension, and can guarantee the construction safety. The device of the invention has strong adaptability, simple construction, convenient operation, and high work efficiency when tensioning in box girder box with multiple sections, has a maximum lifting capacity of 2t, a maximum lifting height of 1.9m (the distance from the working surface to the center of the jack), and high stability, not only is suitable for the tension in the box of straight web plate box girder, but also can be used for the box prestress tension of variable cross-section inclined box girder.

Description

technical field [0001] The invention relates to bridge construction equipment, in particular to a device for installing a tension jack inside a box girder box. Background technique [0002] With the rapid development of our country's economy and society, many new cross-sea and river bridges will be built across the country. The commonly used construction method for box girder box tensioning is to use section steel to build a tensioning jack installation platform similar to scaffolding in the box, and install and position the jack on the platform. There are several problems in the following aspects when using this method to stretch the prestressed beam in the box girder box: 1. More shaped steel and labor are needed to set up the operating platform. 2. When there are many prefabricated sections, the tension construction period in the box girder is long. 3. Poor adaptability to the changeable construction environment inside the box. 4. The weight of the tensioning jack is g...

AI Technical Summary

Problems solved by technology

There are several problems in the following aspects when using this method to stretch the prestressed beams in the box girder box: 1. More steel and labor are needed to set up the operating platform.

2. When there are many prefabricated segments, the tension construction period in the box girder is long

3. Poor adaptability to the changeable construction environment inside the box

4. The weight of the tensioning jack is generally about 400-1000Kg, which is relatively heavy. It is not easy to freely control the height and alignment during operation, and the installation is very difficult.

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