JP3004205U - Members for welded joints - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a member for a welded joint, which has a good heat dissipation property, prevents corrosion due to rainwater, etc., and can visually confirm the welding state. [Structure] The welded joint member 11 is provided with a large number of holes 11a having a diameter such that the molten metal 12 does not leak. Temporarily fix the welded joint member 11 to the rebars 13 and 14, and rebars 13 and 14
The molten metal 12 is filled between the end surfaces 13a and 14a of the.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a welded joint member used when connecting steel bars such as reinforcing bars by welding.

[0002]

[Prior art]

 Methods for connecting the reinforcing bars include gas pressure welding, welding joints and mechanical joints. Among the above-mentioned construction methods, the welding joint construction method, for both manual welding and semi-automatic welding, for welded joints consisting of a metal cylinder with both ends opened and a hole 1a formed in the substantially central portion in the longitudinal direction as shown in FIG. Member 1 is used.

As shown in FIG. 5, the rebars 2 and 3 are inserted into the welded joint member 1 through the openings at both ends, and the end faces 2a and 3a of the rebars 2 and 3 are separated from each other by a predetermined distance. A welding rod (not shown) is inserted from 1a to fill the molten metal 4 between the end faces 2a and 3a of the reinforcing bars 2 and 3 and connect the reinforcing bars 2.3.

[0004]

[Problems to be solved by the device]

 The molten metal 4 filled in this way is welded without flowing down from the member 1 for welded joints, but the heat of the molten metal 4 is accumulated in the member 1 for welded joints, so that the molten metal 4 Cooling does not proceed and work time becomes long. In addition, the heat of the molten metal 4 is also stored in the rebars 2 and 3, and the metal structure of the rebars 2 and 3 changes due to the effect of this heat, and the strength of the rebars 2 and 3 decreases.

Further, since the periphery of the welded portion is covered with the member for welded joint, there is also a problem that the welded state of the reinforcing bar cannot be visually inspected. In addition, when the reinforcing steel is filled with concrete, if it rains or if water enters from the concrete and water collects in the gap between the welding joint member and the reinforcing steel, the reinforcing steel will be oxidized and corroded. have. In particular, oxidative corrosion of rebar often occurs when the rebar is connected vertically to the ground or when the rebar is buried in the ground.

The present invention has been made in view of the above problems, and provides a member for a welded joint, which has good heat dissipation, prevents corrosion due to rainwater, etc., and can visually confirm the welding state. Has an aim.

[0007]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention provides a large number of holes having a diameter such that molten metal does not leak in a member for a welded joint used when connecting reinforcing bars by welding.

[0008]

[Action]

 According to the present invention, since a large number of holes having a diameter that prevents molten metal from leaking are opened in the member for welding joints used when connecting reinforcing bars by welding, the molten metal filled between the end faces of the reinforcing bars is The heat is radiated to the outside air from the hole of the welded joint member.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a perspective view showing the shape of a member for a welded joint of the present invention, and FIG. 2 is a sectional view showing a state where a reinforcing bar is welded using the member for a welded joint of the present invention.

In FIG. 1, reference numeral 11 denotes a member for welding joint of the present invention, which is made of, for example, a stainless steel plate, and has a shape of, for example, a cylinder having an outer diameter of 37 mm, a wall thickness of 4 mm, and a length of 45 mm, which is axially divided into two parts. The holes 11a having a diameter of, for example, φ5 mm, which does not allow the molten metal 12 to leak, are provided in parallel at a pitch of 10 mm.

The present invention has the above-described shape, and as shown in FIG. 2, the axes are aligned with each other and the end faces 13a and 14a are separated by a predetermined distance, for example, an outer diameter φ25 mm. After the welding joint member 11 is temporarily fixed to the reinforcing bars 13 and 14 from below, a welding rod (not shown) is inserted between the end faces 13a and 14a of the reinforcing bars 13 and 14 to fill the molten metal 12.

At this time, the molten metal 12 does not leak from the hole 11a of the welded joint member 11 and comes into contact with the outside air.・ The heat is not stored in 14. As a result, the cooling and solidification of the molten metal 12 is promoted to shorten the working time, and at the same time, it is possible to prevent the strength of the reinforcing bars 13 and 14 from being lowered due to the influence of heat. After the welding is completed, the welding state can be visually inspected through the hole 11a of the welded joint member 11.

[0013] Furthermore, when the reinforcing bars 13 and 14 are filled with concrete, it is raining, or water enters from the concrete, so that the gap 15 between the welding joint member 11 and the reinforcing bars and 13 and 14 is filled with water. When it enters, water is discharged from the hole 11a, so that oxidative corrosion of the reinforcing bars 13 and 14 is prevented.

In the present embodiment shown in FIGS. 1 and 2, the case where the holes 11a are provided in parallel in the welded joint member 11 has been described. However, as shown in FIG. 3, when the holes 11a are provided in a staggered arrangement. Since a larger number of holes 11a can be arranged while ensuring the same spacing as when holes 11a are provided in parallel, heat dissipation and drainage can be performed more effectively.

Further, in the present embodiment, the case of a welding joint member having a shape in which a cylinder is divided into two in the axial direction at the center has been described, but the same shape as the conventional one, that is, both ends are opened, and a substantially longitudinal direction is formed. The same effect can be obtained when a large number of holes for heat radiation are provided in a tubular welded joint member having a hole for inserting a welding rod in the center.

[0016]

[Effect of device]

 As described above, the welded joint member of the present invention has a large number of holes having a diameter such that molten metal does not leak in the welded joint member used when connecting reinforcing bars by welding. Therefore, the heat of the molten metal is radiated from the hole of the welded joint member and is not stored in the welded joint member and the reinforcing bar, so that the working time can be shortened and the strength reduction of the reinforcing bar can be prevented.

After the welding is completed, the state of the molten metal filled between the reinforcing bars can be visually inspected through the hole of the member for welded joint. Further, when water enters the gap between the welded joint member and the reinforcing bar, the water is discharged from the hole, so that the oxidative corrosion of the reinforcing bar is prevented.

[Brief description of drawings]

FIG. 1 is a perspective view showing the shape of a welded joint member of the present invention.

FIG. 2 is a cross-sectional view showing a state where a reinforcing bar is welded using the member for welded joint of the present invention.

FIG. 3 is a perspective view showing a second shape of the welded joint member of the present invention.

FIG. 4 is a perspective view showing a shape of a conventional welded joint member.

FIG. 5 is a cross-sectional view showing a state in which a reinforcing bar is welded using a conventional welded joint member.

[Explanation of symbols]

 11 Member for Welded Joint 11a Hole 12 Molten Metal 13 Reinforcing Bar 13a End Face 14 Reinforcing Bar 14a End Face

Claims (2)

[Scope of utility model registration request] 1. A member for a welded joint used when connecting reinforcing bars by welding, characterized in that a large number of holes having a diameter such that molten metal does not leak are formed. 2. The member for a welded joint according to claim 1, wherein the holes are arranged in a staggered manner.