A device for applying stress to a pre-bent prestressed beam and its construction method

Abstract

The invention belongs to the technical field of civil engineering construction machinery and equipment manufacturing, and discloses a pre-bent prestressed beam applying stress device and a construction method thereof, including a pre-camber steel beam, a three-bar hinged steel pier frame and a shaped loading jack. The pre-camber steel beam is arranged on the three-bar hinged steel pier frame, and the shaped loading jack is placed on the upper surface of the pre-camber steel beam; the shaped loading jack is hinged with a tie rod through a high-strength bolt rod, so The end of the pre-camber steel beam is hung with a hook, and the hook is provided with a through hole for the pull rod to be plugged in. One end of the pull rod passing through the through hole is threaded and connected with a fixing nut. A high-strength spring abutting against the fixing nut is installed on one side of the pull rod passing through the through hole. The invention solves the problems that the device cannot be reused, is easy to tilt and has high cost.

Description

technical field [0001] The invention belongs to the technical field of civil engineering construction machinery and equipment manufacturing, and in particular relates to a stress applying device for a pre-bent prestressed beam and a construction method thereof. Background technique [0002] Pre-bent prestressed composite beams are also called pre-bent beams. Their mechanical properties are between steel structure bridges and reinforced concrete bridges. They belong to the category of composite structure bridges. Compared with general composite structures, they have the characteristics of prestressing. Compared with steel structure, reinforced concrete structure, prestressed concrete structure and steel-concrete composite structure bridge, the pre-bent prestressed composite beam bridge has unique advantages, such as small building height, large structural bearing capacity, good structural durability, and easy hoisting. Light weight, high degree of assembly, fast construction ...

AI Technical Summary

Problems solved by technology

[0006] 1. The pre-bending construction process of single-beam and double-beam is complicated, and all loading equipment is manufactured and installed on site. Installing anti-rolling device, applying pre-bending force and anchoring, turning over the beam process requires adding new devices

[0007] 2. Double girder pre-bending has high requirements on the loading device

The production efficiency of pre-bending beams is low due to pre-bending of single beams, and it is difficult to reuse the reaction platform and ground anchors made on site when single beams are loaded

[0008] 3. These two methods require the manufacture of a support platform with a certain rigidity and strength, a loading reaction frame, a ground anchor, an anti-sideshift device, an overturning frame, and a prestressed anchor device, and the equipment is heavy, and the transfer and transportation are troublesome

[0009] 4. A large number of devices such as support platform, loading reaction frame and ground anchor cannot be reused, and the construction cost is high

The pre-bending loading of the beam needs to be constructed on a special support platform, and the construction period is long

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