Locking mouth structure of hot-rolling U-shaped steel sheet pile

Abstract

The invention discloses a locking mouth structure of a hot-rolling U-shaped steel sheet pile. The locking mouth structure is mainly characterized in that a circular-arc curved surface formed from the end of a locking mouth to an outer side surface and a circular-arc curved surface formed on the inner side surface of a locking mouth root are better matched to each other, a tilt angle Alpha formed on the outer side of the locking mouth is 75-88 degrees, an oblique angle Beta of a contact surface of the locking mouth is 35-55 degrees, an excircle radius R1 of the end of the locking mouth is 3-6 mm, an inner circle radius R2 of the corresponding locking mouth root is 3.5-7 mm, an excircle radius R3 of the side end of the locking mouth is 15-22 mm, and an inner circle radius R4 of the corresponding locking mouth root is 14-22 mm. The locking mouth structure is a brief push-pull type outer contour surface, and is easily separated from a rolling groove to be formed in rolling production, the tensile strength of the locking mouth is high, the section modulus is large, the steel using amount is saved, the locking mouth of the steel sheet pile can form an ideal contact surface, the matching degree of the locking mouth is high, the gap is small, better meshing can be realized, other professional water stopping material is not needed, and the steel sheet pile self has stronger water stopping and seepage prevention functions.

Description

technical field [0001] The invention relates to a locking structure of a hot-rolled U-shaped steel sheet pile, that is, the most critical part of the hot-rolled U-shaped steel sheet pile—the pile body connection joint. Background technique [0002] The hot-rolled steel sheet pile that has emerged in the field of foundation engineering construction in my country in recent years is a special-shaped section with high production and application technology. According to the difference in shape, hot-rolled steel sheet piles are divided into U-shaped steel sheet piles, Z-shaped steel sheet piles and linear steel sheet piles. kind Types, among which U-shaped steel sheet piles have begun to be applied in our country. The main technical difficulty in the production of hot-rolled U-shaped steel sheet piles is that it is difficult to form the locking part. Since the rolling process technology has yet to be broken through, my country does not yet have the conditions for industrialized p...

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Problems solved by technology

[0004] 1. Cold-formed steel sheet piles are processed by cold-formed coils with a certain thickness. The parts of the pile body cannot be thickened or thinned according to the needs, and the section thickness of the locking part cannot be optimized (see attached figure 1 ), the connection part can only be in line contact, and the buckle is not tight when connecting, it is difficult to achieve the coupling required for the application (see attached figure 2 )

[0005] 2. The deformation stress of the cold-formed steel sheet pile with coil as raw material is very large, and the lock part with the most severe processing deformation contains high residual stress. After a period of time, the end of the lock will be partially deformed, which cannot be guaranteed The arc lock angle of each steel sheet pile is always the same

[0006] 3. Cold-formed steel sheet piles are usually formed by hot-rolled coils with a thickness ranging from 6 to 14mm. Changes in thickness lead to large differences in the shape of the lock (the radius of the bending arc changes with the thickness of the plate), and it is difficult to maintain the shape of the lock Stablize

[0007] 4. After the cold-formed steel sheet pile is rolled and flattened, the cold-bending process is carried out. The degree of hardening at the lock with the most severe deformation is the highest, and the residual stress is accumulated, resulting in poor toughness and brittle fracture of the lock (mechanical performance tests show: elongation decay up to 70%), unable to achieve repeated use

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