JP2003056208A - Residual stress removing method of tower-like steel structure composed of angle steel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To return a structure to performance in design by removing residual stress due to uneven displacement and remolding it so as not to produce influence of the residual stress in the case that foundation of the tower-like steel structure is moved due to damage of an earthquake or the like and the residual stress due to the uneven displacement is produced in a structural material. SOLUTION: In the method in a member producing the residual stress by receiving the uneven displacement in the tower-like steel structure composed of a steel material, a unit attaching hole is drilled in the upper and lower ends of a main column material of an arbitrary panel to join a unit to the hole with bolts, and both the ends of a support bar joining a steel pipe and a jack in the longitudinal direction and the unit are joined. A plurality of holes are drilled in a main column material center flange part sandwiched between the units, and one-sided flange of the main column material is cut while the jack attached to the support bar is adjusted and stress acting on the main column material is moved on the support bar. The cross sectional face of the cut flange is stretched to join a working bat provided with two oval holes in the longitudinal direction by bolts.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention eliminates residual stress due to unequal displacement when residual stress due to unequal displacement is generated in components when the foundation of a tower steel structure moves due to damage such as an earthquake. Provide a method of modifying a structure so that it is not affected by residual stress and returning the structure to the performance at the time of design.

[0002]

2. Description of the Related Art Conventionally, when a tower-shaped steel structure such as a power transmission tower is moved due to damage such as an earthquake, the structure is often rebuilt or a new member is added to reinforce the structure. It was This is because the power transmission tower is designed so that there is no waste in terms of strength, and if residual stress occurs due to unequal displacement, the yield strength of the entire structure will also decrease, and the performance as designed will not be achieved. . However, there was a problem that rebuilding costs include the removal of existing structures, and reinforcing costs include the cost and days involved in strength calculation and reinforcing work.

Further, the residual stress generated with the movement of the foundation becomes the largest in the main column material of the bottom joint of the tower-like steel structure.
Even in the design, since the stress generated in the bottom column main column material is the largest, there is a risk that the tower steel structure will collapse from the bottom node due to the effect of residual stress. In particular, if the typhoons and seasonal winds overlap, there is a risk that the tower will collapse.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and can be easily applied to a tower-like steel structure in which the foundation is moved due to an earthquake etc. It is intended to provide a method for removing residual stress generated in a pillar material and returning a structure to the performance at the time of design.

[0005]

In order to achieve the above object, a residual stress removing method for a tower-shaped steel structure made of angle steel in the present invention is a tower-shaped steel structure made of steel, A unit mounting hole is formed in the upper and lower ends of the main pillar of any panel, the unit is bolted to the hole, and the unit is joined to both ends of a support rod that connects the steel pipe and the jack in the longitudinal direction. A plurality of holes are made in the center flange part of the main pillar sandwiched between the units, and while adjusting the jacks attached to the support rods to transfer the stress acting on the main pillars to the support rods, Cutting one flange, crossing the cut surface of the cut flange, bolting a work bat with two long holes in the longitudinal direction, and adjusting the jack attached to the support rod to act on the main pillar material Transfer the stress to It is intended to cut the al main pillar central portion rest of the flange.

Further, after cutting the central portion of the main pillar member, the jacks of the supporting rods are adjusted to eliminate the effect of the unequal displacement on the structure, and the main pillar member is cut by an auxiliary butt so as to maintain the state. After passing and fixing, the bolts are joined with a butt for connecting the main pillar material.

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below in detail with reference to the drawings showing the embodiments.

FIG. 1 is an example of a tower steel structure. Due to earthquakes and changes in the ground, the foundation that supports the steel tower structure moves and causes unequal displacement. The unequal displacement affects the members of the tower steel structure connected to the foundation, and residual stress occurs in the members.

FIG. 2 is a front view showing a state where a residual stress removing device is attached to the main pillar material, and FIG. 3 is a top view (bottom view) thereof. The residual stress eliminator has a unit mounting hole 5 at the upper and lower ends of the target main pillar material A.
2 is joined with a bolt 6. The units 1 and 2 fixed to the upper and lower ends of the main pillar A are joined to both ends of two support rods in which the steel pipe 3 and the jack 4 are connected in the longitudinal direction.

In the state shown in FIG. 2, the jack 4 attached to the supporting rod is operated to transfer the stress of the main pillar material A to the residual stress removing device for the main pillar material, while removing the central portion B of the main pillar material. Cut each flange. At this time, a plurality of butt attachment holes 7 are formed in the central portion B of the main pillar material, and the cut flange is joined with work bolts 9 to work bats 8 having two long holes in the longitudinal direction. After passing the cut surface and bolting the work bat 8 to the flange portion, the other flange is cut and connected with the other work bat 8. Residual stress of the main pillar is eliminated by cutting the main pillar central part.
The residual stress of the main pillar material is taken up by the main pillar material that bears the load of the tower steel structure.

FIG. 4 is a front view of the butt for connecting the main pillar members in the main pillar member attached state, and FIG. 5 is a side view of the butt for connecting the main pillar members in the main pillar member attached state. As shown in FIGS. 4 and 5,
Further, by operating the jack 4, the main pillar material A moved by the non-uniform displacement of the foundation D while sliding the long hole of the work butt bolted to cross the cut main pillar material After fixing the auxiliary butt 10 to the main pillar material cut so as to maintain the position, the auxiliary butt 10 is fixed by the main pillar material connecting bat 11. Then jack 4
Is adjusted to gradually transfer the stress carried by the main pillar material residual stress relieving device to the main pillar material A connected by the main pillar material connecting butt 11, and thereafter, the main pillar material residual stress relieving device is removed. The work ends.

[0011]

The present invention achieves the following effects by performing the procedure described above.

According to the method of "Claim 1," the main pillar material is cut for each flange and connected by the work butt, so that the cut upper and lower main pillar materials do not shift in the longitudinal and lateral directions.
You can work safely.

According to the method of "Claim 2," the stress of the main pillar is once taken by the residual stress removing device attached to the main pillar,
The central portion of the main pillar material is cut, and the length of the main pillar material caused by the uneven displacement of the foundation is adjusted by the butt for connecting the main pillar material to release the residual stress of the main pillar material. It is possible to remove the residual stress due to, and the tower-like steel structure can recover the performance at the time of design even if the foundation is in a state of unequal displacement.

[Brief description of drawings]

FIG. 1 is an example of a tower steel structure.

FIG. 2 is a front view of the main pillar residual stress removing device in a state where the main pillar is attached.

FIG. 3 is a top view (bottom view) of the main pillar residual stress removing device.

FIG. 4 is a front view of the butt for connecting the main pillar member in a state where the main pillar member is attached.

FIG. 5 is a side view of the butt for connecting the main pillar member in a state where the main pillar member is attached.

[Explanation of symbols]

A main pillar material B Main pillar center C tower steel structure D Basic 1 Upper unit 2 Lower unit 3 steel pipe 4 jacks 5 unit mounting holes 6 bolts 7 Bat mounting hole 8 Working bat 9 Working bolt 10 auxiliary bat 11 Main column connecting bat

Claims (2)

[Claims] 1. A tower steel structure composed of steel,
A unit mounting hole is formed in the upper and lower ends of the main pillar of any panel, the unit is bolted to the hole, and the unit is joined to both ends of a support rod that connects the steel pipe and the jack in the longitudinal direction. A plurality of holes are made in the central flange portion of the main pillar material sandwiched between the units, and the jacks attached to the support rods are adjusted to transfer the stress acting on the main pillar material to the support rods, while one side flange of the main pillar material. Cutting the flange, cutting the remaining surface of the main flange by bolting a work butt having two long holes in the longitudinal direction across the cut surface of the cut flange, and cutting the remaining flange at the center of the main pillar material. Method for removing residual stress of structure. 2. The method according to claim 1, wherein after cutting the central portion of the main pillar material, the jacks of the support rods are adjusted to eliminate the effect of the unequal displacement on the main pillar material and to maintain the state. A method for removing residual stress in a structure, characterized in that a bolt connection is performed so as to pass between the main pillar materials cut by a butt for connecting the main pillar materials.