CN107443008B

CN107443008B - Safe cutting method for steel structure with internal force

Info

Publication number: CN107443008B
Application number: CN201710893604.7A
Authority: CN
Inventors: 李有为; 韩治忠; 项梁; 高飞; 俞琳琳
Original assignee: CCCC Second Harbor Engineering Co; CCCC SHEC Fourth Engineering Co Ltd
Current assignee: CCCC Second Harbor Engineering Co; CCCC SHEC Fourth Engineering Co Ltd; CCCC Highway Long Bridge Construction National Engineering Research Center Co Ltd
Priority date: 2017-09-28
Filing date: 2017-09-28
Publication date: 2019-12-31
Anticipated expiration: 2037-09-28
Also published as: CN107443008A

Abstract

The invention discloses a safe cutting method of a steel structure with internal force, belonging to the field of engineering construction, which comprises the following steps in sequence: 1) cutting a first cut of a steel structure with the length L and the width B and the stress F in the direction vertical to the stress direction without cutting, wherein the residual distance between the cut and the complete cut is a; 2) cutting a second cutting seam in the direction perpendicular to the stress direction at a distance b from the first cutting seam, wherein in the cutting process of the second cutting seam, the length of the steel structure is extended from L to L + c, and the corresponding stress is reduced from F to 0; 3) and continuing to cut along the second cutting seam until the steel structure is completely cut off. The invention provides a safe cutting method for releasing stress of a steel structure with stress through deformation.

Description

Safe cutting method for steel structure with internal force

Technical Field

The invention belongs to the field of engineering construction.

Background

In the engineering field, often can touch the condition of taking stress cutting steel construction, because of the steel construction is from taking internal force, when cutting the fracture soon, the condition of tensile fracture suddenly often can appear, producing huge sound, bring certain vibration for the structure, endanger operation personnel safety.

Disclosure of Invention

The invention aims to: aiming at the defects in the prior art, the safe cutting method for releasing the stress of the steel structure with the stress through deformation is provided.

The purpose of the invention is realized by the following technical scheme:

a safe cutting method of a steel structure with internal force sequentially comprises the following steps:

1) cutting a first cut of the steel structure with the stress in the direction vertical to the stress direction without cutting, wherein the residual distance between the cut and the complete cut is a, a is greater than N/f, N is predicted residual internal force, and f is material tensile strength;

2) the first cutting seam b is parallel to the first cutting seam, a is more than b and less than 2a, the second cutting seam is cut in the direction perpendicular to the stress direction, in the cutting process of the second cutting seam, the length of the steel structure is extended from L to L + c, and the corresponding stress is reduced from F to 0;

3) and continuing to cut along the second cutting seam until the steel structure is completely cut off.

The main scheme and the further selection schemes can be freely combined to form a plurality of schemes which are all adopted and claimed by the invention; in the invention, the selection (each non-conflict selection) and other selections can be freely combined. The skilled person in the art can understand that there are many combinations, which are all the technical solutions to be protected by the present invention, according to the prior art and the common general knowledge after understanding the scheme of the present invention, and the technical solutions are not exhaustive herein.

The working process is as follows: in the method, two cutting seams are skillfully arranged according to the characteristics of the steel structure with internal force, and the first cutting seam is not cut but is left with a certain length to resist the internal force of the steel structure, so that the steel structure is not broken in the state. At one section distance position from first joint-cutting, crisscross setting up the second joint-cutting, in this joint-cutting process, form a "cantilever structure" of connecting the steel construction both ends between the two joint-cutting, and along with the second joint-cutting is cut more deeply, this cantilever structure cantilever length is bigger and bigger, under the effect of structure internal force, cantilever structure takes place to warp slowly, and at deformation in-process, consume the member internal force gradually, cut off the steel construction until the second joint-cutting, extend to the in-process of L + c by L at steel construction length, the member internal force is reduced to 0 by F, so, realize making the member internal force can consume completely through steady cutting, and can not appear the internal force sudden change and produce violent destruction and the vibration condition.

The invention has the beneficial effects that: the steel structure can be safely stress cut.

Drawings

FIG. 1 is a schematic illustration of the location of a stressed steel structure to be cut in an embodiment of the invention;

FIG. 2 is a schematic view of an uncut state of a member in the cutting method according to the embodiment of the present invention;

fig. 3 is a schematic view of a state where a first cut slit is cut in the cutting method according to the embodiment of the present invention;

FIG. 4 is a schematic diagram of a second cutting line being cut (the bar is not stretched) in the cutting method according to the embodiment of the present invention;

FIG. 5 is a schematic view of a second cutting line being cut (the bar is stretched) in the cutting method according to the embodiment of the present invention;

FIG. 6 is a schematic view illustrating a state where the bar is completely cut and broken in the cutting method according to the embodiment of the present invention;

where 1 is the cutting position.

Detailed Description

The following non-limiting examples serve to illustrate the invention.

A safe cutting method of a steel structure with internal force takes the cutting of the steel structure with stress in a cutting position 1 in figure 1 as an example, and comprises the following steps in sequence:

1) referring to fig. 2 and 3, cutting a first cut of a steel structure with stress F and length L and width B in a vertical stress direction without cutting, wherein the residual distance from the cut to the complete cut is a, a is greater than N/F, N is the predicted residual internal force, and F is the tensile strength of the material;

2) referring to fig. 4, a first cut b is parallel to the first cut b, and a < b <2a, a second cut is cut in the direction perpendicular to the stress direction, and in the cutting process of the second cut, referring to fig. 5, the length of the steel structure is extended from L to L + c, and the corresponding stress is reduced from F to 0;

3) referring to fig. 6, cutting is continued along the second cut until the steel structure is completely cut.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. The safe cutting method of the steel structure with the internal force is characterized by comprising the following steps in sequence:

2) a second cutting seam is cut in the direction perpendicular to the stress direction, the second cutting seam and the first cutting seam are arranged on two different sides of the steel structure, in the cutting process of the second cutting seam, the length of the steel structure is extended from L to L + c, and the corresponding stress is reduced from F to 0;