Extrusion steel semi-grouting sleeve and preparation method thereof

Abstract

The invention provides an extrusion steel semi-grouting sleeve and a preparation method thereof. The method comprises the following steps of (A) performing primary annealing treatment on a sleeve crude pipe subjected to cold milling at 700 to 720 DEG C for 25 to 30 min; then, performing extrusion for pipe shrinkage; (B) performing secondary annealing treatment on the sleeve treated in the first step at 550 to 600 DEG C for 15 to 20min; performing shaping processing. The preparation method has the advantages that the extrusion method is used for preparing the grouting sleeve; all defects of thegrouting sleeve prepared by ball milling and mechanical processing in the prior art are avoided; the quality in the production process is controllable; the mechanical performance change work procedure cannot occur; the production efficiency is high; no waste iron chip is discharged out in the production process; the cost is reduced; green and environment-friendly effects are achieved; the operation process is controllable; the prepared grouting sleeve has excellent performance in each aspects, so that the sleeve is worthy of being widely popularized and applied.

Description

technical field [0001] The invention relates to the field of grouting sleeve processing and preparation, in particular to an extruded steel semi-grouting sleeve and a preparation method thereof. Background technique [0002] Prefabricated concrete structures, as a structural form in line with industrial production methods, have the advantages of fast construction speed, low labor intensity, less noise pollution and wet work, and easy control of product quality, and have been widely used in developed countries. The construction method of prefabricated assembly can effectively save resources and energy, improve the utilization rate of materials in realizing building energy saving and structural performance, overcome the restrictions of construction site and environmental conditions on on-site construction, reduce the number of on-site construction labor, reduce construction waste and Adverse effects of construction on the environment, improving building functionality and struc...

AI Technical Summary

Problems solved by technology

[0004] The existing grouting sleeve manufacturing process generally adopts the ball milling cast iron process and mechanical processing technology. The disadvantages of the ball milling cast iron process are: 1. The nodularization rate ≥ 85% is controlled by the factory and the mechanical properties are unstable.

2. The elongation rate of ductile iron is low, and the elongation rate after fracture is ≥5%. Yicui is prone to internal stress

3. The pollution of ductile iron products is not conducive to environmental protection

The disadvantages of mechanical processing technology are: 1. The difficulty of machining is high, the production efficiency is low, and the cost is high

2. A large amount of iron filings in the machining process is a waste of resources and environmental protection is uncontrollable

3. The amount of steel used is large, sharp corners are easily formed during processing, and cracks are generated due to internal stress concentration

[0005] It can be seen that the processing technology of the existing technology generally has problems such as difficult processing, damage to the mechanical properties of the sleeve after processing, low tensile strength pass rate and long tensile test period.

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