The construction method of making the working layer of the annular heating furnace by using wooden formwork and section steel

Abstract

The invention relates to a construction method for making a working layer of an annular heating furnace by using wooden formwork and section steel. The construction sequence of the method is the furnace wall, furnace top and furnace bottom of the working layer of the annular heating furnace in sequence. The furnace wall includes an inner ring wall and an inner ring wall. The outer ring wall, wherein the furnace wall construction method includes the following steps: (1) wood formwork processing and manufacturing; (2) formwork support and pouring: (1) measurement and setting out; (2) establishment of a wood formwork support system; (3) Formwork support; (4) Pouring and vibration guidance; (5) Curing and form removal; (6) Curing; (7) Baking the cured working layer until dry, and the cast annular heating furnace wall after baking After the molding is completed, the entire annular heating furnace wall wood formwork is turned over three times, each construction is at 120°C, and each turnaround is divided into 5-7 layers for pouring. The construction method of the invention is simple, the molding quality is good, the construction period is short, the cost is low, and it is a construction method for making the working layer of the annular heating furnace by using wooden formwork and section steel which can reduce the labor intensity.

Description

technical field [0001] The invention relates to the field of annular heating furnaces, in particular to a construction method for making a working layer of an annular heating furnace by using wooden formwork and section steel. Background technique [0002] The annular heating furnace is one of the main equipment in the metallurgical industry. The currently used annular heating furnace generally has a median diameter of 48m, a furnace width of 5.4m, a furnace height of 2.2m, a furnace wall castable thickness of 230mm, and a design output of 500,000 tons per year. The working layer of the furnace wall originally designed in Italy was made of refractory plastic, which was changed to refractory castable after the test, with a thickness of 230mm. During the construction, steel formwork and φ48 steel pipe support were used to pour the working layer of the annular heating furnace, although it can be used after casting , but there are the following problems: 1. The support strength ...

AI Technical Summary

Problems solved by technology

The working layer of the furnace wall originally designed in Italy was made of refractory plastic, which was changed to refractory castable after the test, with a thickness of 230mm. During the construction, steel formwork and φ48 steel pipe support were used to pour the working layer of the annular heating furnace, although it can be used after casting , but there are the following problems: 1. The support strength and rigidity of the steel pipe are not enough, and the poured working layer has different degrees of mold expansion, and the local mold expansion reaches 60mm, which exceeds the requirement of less than 5mm in the specification, which affects the service life of the furnace body. The construction cost is increased during the process, resulting in waste of manpower, material resources and raw materials; 2. The wall of the poured working layer is arc-shaped, and the shaped steel formwork used is flat and has no arc, so it is difficult to ensure that the furnace The structural size of the wall; 3. In the process of supporting the formwork, the steel formwork is connected with joints. After the construction is completed, seam ridges appear on the surface of the furnace wall, the appearance is poor, and the surface of the working layer is prone to rough surface; 4. Steel formwork And steel pipes are heavy in weight, high in processing costs, difficult in transportation, combination, and assembly, long in processing time, and labor-intensive for workers

Images