Mounting method for prestress tensioning end slip-form formworks

Abstract

A mounting method for prestress tensioning end slip-form formworks is characterized by comprising the following steps that a, prestress is set above a bottom plate of a concrete silo; b, pieces of angle steel are mounted on the two sides in the width direction of the inner sides of reserved long grooves; c, a plurality of wood baffles are mounted close to the inner sides of every two pieces of theangle steel; d, prestressed bars, spiral bars, bearing plates and cavity formworks are mounted; e, concrete is poured, and the formworks are lifted up, the step c and the step d are repeated, gaps between the two sides of each wood baffle and a combined steel formwork are both 10 mm, therefore, when the combined steel formworks slide in the slip-form process, the wood baffles are penetrated by the prestressed bars at the tensioning ends to keep still. The mounting method for the prestress tensioning end slip-form formworks has the advantages that the formworks are simple in structure and convenient to manufacture; the engineering quality is safe and reliable; the formworks have enough strength, rigidity and stability; the parts, reserved outside the formworks, of prestressed steel strandscan successfully pass through a slip-form system, and the airtightness of abutted seams of the slip-form formworks is guaranteed.

Description

technical field [0001] The invention relates to a formwork installation method, in particular to a prestressed tension end sliding formwork installation method. Background technique [0002] Unbonded prestressing technology is widely used in the engineering field. Unbonded prestressed tendons usually use steel strands with a diameter of 15.2mm and a tensile strength of 1860MPa, and are covered with anti-corrosion grease and sheaths. They have simple structure, convenient construction, and corrosion resistance. Strong and other characteristics. [0003] figure 1 It is a schematic diagram of the known tension end structure of unbonded prestressed tendons. The tension end assembly of unbonded prestressed tendons is composed of unbonded prestressed tendons, spiral tendons, bearing plates and anchors. [0004] figure 2 It is a schematic structural diagram of known unbonded prestressed tendon tension end and concrete pouring formwork. Unbonded prestressed tendons, spiral ten...

AI Technical Summary

Problems solved by technology

The known slipform formwork transformation method is to adopt retaining formwork grooves, and set polystyrene materials for blocking concrete on the inside of the slipform formwork grooves. Grout leakage is easy to occur at the middle formwork groove, resulting in insufficient compactness and reduced strength of the concrete at the tension end, which affects the prestressing effect

[0009] Therefore there are above-mentioned inconveniences and problems in the mode of retaining formwork groove of known slipform formwork

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