JP6879786B2 - How to make a buckling restraint brace - Google Patents

Description

The present invention relates to a method for manufacturing a buckling restraint brace used for seismic resistance, vibration damping brace, flint material, civil engineering structure such as a bridge or an iron bridge.

Conventionally, as shown in FIGS. 3 to 5, the buckling restraint brace 11 is a restraint filler (for example, mortar) in which a steel material serving as a core material 12 is filled in the restraint frame member 13 and the recesses of the restraint frame member 13. It is sandwiched between the restraint members 20a and 20b formed by 14, and the end portion of the restraint frame member 13 in the lateral direction is fixed by the fillet welded portion a to be integrated.

Explaining the method of forming the buckling restraint brace 11, as shown in FIG. 4, the unbonded materials 17 and 18 for edge cutting are attached to the core material 12. Both ends of the core material 12 in the longitudinal direction are formed in a rib plate 19 provided with bolt holes for joining.

The closing member 16 is welded and fixed to both ends of the restraint frame member 13 in the longitudinal direction. A mortar, which is a restraint filler 14, is cast and filled in the recess of the restraint frame member 13. Space adjusting spacers 15 are arranged on both side surfaces of the core material 12, they are placed on the restraining material 20b, and the other restraining material 20a is covered so as to be staggered. As shown in 5, the end portion of the restraint frame member 13 in the lateral direction is fillet welded by a welding means, and the restraint members 20a and 20b composed of the core material 12, the restraint frame member 13 and the mortar at the fillet welded portion a. Is integrated to form a buckling restraint brace 11.

As such a buckling restraint brace 11, the one described in Patent Document 1 is known.

Japanese Unexamined Patent Publication No. 2003-293461

However, in the conventional buckling restraint brace, since the restraint frame material 13 is manufactured, it is manufactured after passing through a steel pipe processor, so that the manufacturing process is poor. In addition, the labor of welding the restraint frame member 13 increases. Further, it is difficult to add the effect of the filler in the calculation of the stiffening force for suppressing the buckling of the core material 12.

Further, in the case of the above-mentioned buckling restraint brace of the pre-casting type, the construction accuracy of the non-landing of the filler (mortar) surface affects the brace performance. Furthermore, if the buckling restraint brace is a filling type, in which the core material is passed through a tubular restraining member and the mortar is filled from the end in the longitudinal direction, the filling status of the filling material inside cannot be grasped. In this case, it is necessary to erect the material shaft and place the filler, which requires a large facility in the vertical direction, and there is a problem that it is difficult to correct the warp of the core material. The buckling restraint brace and the method for manufacturing the buckling restraint brace according to the present invention have been proposed to solve such a problem.

The gist for solving the above-mentioned problems of the method for manufacturing a buckling restraint brace according to the present invention and achieving the object is to enclose a core material having joints for joining at both ends in the longitudinal direction with an unbonded material, and then surround the core material. , The core material is positioned at a desired position inside the formwork for buckling restraint brace laid on the floor, and high-strength fiber reinforced concrete is struck in the formwork for buckling restraint brace. The high-strength fiber-reinforced concrete was placed, the finished surface of the high-strength fiber-reinforced concrete was leveled, and after the required strength of the high-strength fiber-reinforced concrete was placed, the formwork was removed from the formwork to manufacture the spacer. Two steps are provided in the horizontal direction and one position is provided in the vertical direction with respect to the material.

,
The core material is installed so that the material shaft is laid down along the floor surface and its weak shaft is parallel to the vertical direction.

The formwork for buckling restraint brace includes a metal formwork that can be diverted.

According to the buckling restraint brace of the present invention and the manufacturing method thereof, it takes time and effort to adjust the non-landing of the restraint concrete in the conventional pre-casting type, and it takes time and effort to weld the fitting. Then neither is necessary. Further, in the conventional post-casting type, a large facility in the height direction is required when manufacturing a long product, but in the present invention, it can be laid on its side for manufacturing.

Further, since the steel pipe is not used as the formwork as the restraint material, only one manufacturer of the restraint material is required, and the manufacturing process is improved. Since the metal formwork is diverted, the manufacturing process is improved. The rust preventive coating on the surface of the restraint material, which was the conventional final finish, is no longer necessary, the manufacturing period is shortened, and the manufacturing cost is reduced. In addition, since it can be manufactured in the workplace, transportation costs can be reduced. It has an excellent effect that the performance as a restraining material can be evaluated for the entire high-strength fiber reinforced concrete.

In the formwork cross-sectional view (A) at the time of concrete placing showing the manufacturing method of the buckling restraint brace 1 according to the present invention, the weak axis y is set in the vertical direction (vertical direction) in the core material 2 of the buckling restraint brace 1. It is sectional drawing (B) of the state. It is an overall perspective view of the buckling restraint brace 1 of the present invention. It is a perspective view of the buckling restraint brace 11 which concerns on a conventional example. It is an exploded perspective view which shows the structure of the buckling restraint brace 11. It is sectional drawing of the buckling restraint brace 11 along the X-ray line shown in FIG.

As shown in FIG. 1, the buckling restraint brace 1 and the method for manufacturing the buckling restraint brace 1 according to the present invention are formed by using high-strength fiber reinforced concrete (UFC) 7.

As shown in FIGS. 1 and 2, the buckling restraint brace 1 according to the present invention includes a core material 2 having joint portions 3 for joining at both ends in the longitudinal direction, and an unbonded material 4 covering the core material 2. , The high-strength fiber reinforced concrete 7 for burying the core material 2 and the portion of the unbonded material 4 other than the joint portion.

The high-strength fiber-reinforced concrete 7 has a compressive strength of 60 N / mm ² or more, high toughness is ensured by the reinforcing effect of steel fibers, and has an extremely high durability due to a dense structure. ..

The core material 2 is, for example, a steel member having a rectangular cross section, has a joint portion 3 at an end portion in the longitudinal direction thereof, and has a plurality of through holes 3a. Since the core material 2 is embedded in the high-strength fiber reinforced concrete 7, the buckling restraint brace 1 is used for a steel pipe having a metal frame material or a recess like the conventional buckling restraint brace 11. Not necessary for.

A method for manufacturing the buckling restraint brace 11 according to the present invention will be described. As shown in FIG. 1, a core material 2 for a buckling restraint brace having joint portions 3 for joining at both ends in the longitudinal direction is surrounded by an unbonded material 4. The unbonded material 4 is, for example, a sheet material such as butyl rubber.

This butyl rubber is a synthetic rubber having excellent ozone resistance, aging resistance, electrical insulation, and shock absorption. The unbonded material 4 prevents adhesion between the core material 2 and concrete, is an edge cutting material, and is wound over the entire circumference of the core material 2. As a result, in the buckling restraint brace 11 of the conventional example, two spacers such as a square bar and a round bar are used in addition to the unbonded materials 17 and 18, but the buckling restraint brace 1 according to the present invention does not require it. Become.

After that, the buckling restraint brace formwork 6 laid on the floor is installed. As a metal formwork 6 that can be diverted, for example, a steel formwork 6 is arranged horizontally on the bed 5 on the floor surface. The core material 2 is positioned and installed at a desired position inside the steel formwork 6 with a spacer 8.

As shown in FIGS. 1 (A) and 1 (B), the core material 2 lays the material axis (the axis passing through the centroid in the longitudinal direction) along the floor surface and has a strong axis x having a large secondary moment in the cross section. Is horizontal, and the weak axis y orthogonal to the strong axis x is installed in parallel along the vertical direction (described as the vertical direction in the figure).

The reason for arranging the core material 2 in this way is to make the concrete placing surface a surface having a narrow width b of the core material 2 to prevent the formation of air pools and to place the concrete densely.

The high-strength fiber-reinforced concrete 7 is cast into the buckling restraint brace formwork 6, and the cast-finished surface 9 of the high-strength fiber-reinforced concrete 7 is leveled. Then, after the required strength of the placed high-strength fiber reinforced concrete 7 is developed, the steel form 6 is removed from the mold to manufacture the concrete.

The buckling restraint brace 1 manufactured in this way is used as a high yield strength brace material for a vibration damping brace of a building or the like.

According to the buckling restraint brace 1 and the manufacturing method thereof according to the present invention, it is widely applied to buildings, civil engineering structures such as bridges and iron bridges as long seismic and vibration damping braces.

1 Buckling restraint brace,
2 core material,
3 joints, 3a through holes,
4 unbonded material,
5 beds,
6 Steel formwork,
7 High-strength fiber reinforced concrete,
8 spacers,
9 Casting finished surface,
11 Buckling restraint brace,
12 core material,
13 Restraint frame material,
14 Restraint filler (mortar),
15 spacers,
16 Closing board,
17, 18 unbonded material,
19 rib plate,
20a restraint material,
20b restraint material,
a Fillet weld.

Claims (3)

A core material having joints for joining at both ends in the longitudinal direction is surrounded by an unbonded material.
After that, the core material was positioned at a desired position with a spacer and installed inside the buckling restraint brace form laid on the floor.
High-strength fiber reinforced concrete is placed in the formwork for buckling restraint brace.
The cast-finished surface of the high-strength fiber reinforced concrete is leveled and smoothed.
After the required strength of the cast high-strength fiber reinforced concrete is developed, it is manufactured by removing it from the mold.
The spacers shall be provided in two steps in the horizontal direction and one in the vertical direction with respect to the core material.
A method of manufacturing a buckling restraint brace characterized by. The core material should be installed with its axis laid along the floor and its weak axis parallel to the vertical direction.
The method for manufacturing a buckling restraint brace according to claim 1. The formwork for buckling restraint brace is a metal formwork that can be diverted.
The method for manufacturing a buckling restraint brace according to claim 1 or 2.

Images