JPH04371489A - Attaching method for lifting lug - Google Patents

Abstract

PURPOSE:To surely and quickly attach a lifting lug to be fitted to the lower surface of a beam, etc., to lift various equipments in work for pulling them. CONSTITUTION:One or more studs 2 are welded by stud welding to be fixed on the lower surface of a metal-made strength member 1 such as a beam or packer plate installed in the upper part. The stud 2 is inserted in a bolt hole of a lifting lug 3 to engagedly fix the lifting lug 3 to the strength member 1 with nuts 8. Or a hooking part for hanging is formed on the lower part of the stud 2 itself.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for attaching a hanging fitting for hoisting equipment for inspection, maintenance, installation, etc., inside and outside of buildings of various plant facilities.

0002

2. Description of the Related Art For example, hoisting hooks are sometimes installed on beams or ceiling surfaces above various types of equipment such as power generation plants for maintenance and inspection purposes and other purposes. and,
The upper end of the chain block was secured to the hook, and heavy items such as electric valves and actuators of various equipment were lifted up and disassembled. Conventionally, the installation of a hanging metal fitting such as a lifting hook has been carried out as follows. That is, as shown in FIG. 6, as an example, the upper end of the hanging fitting 3 is brought into contact with the lower surface of a strength member 1 such as a beam, and the entire circumference of the contact portion is welded by arc welding. The welded portion of the hanging fitting 3 required a so-called beveling process in advance. Furthermore, after the welding work was completed, it was necessary to perform cutting work on the welded part using a grinder. A hook at the upper end of the chain block is hooked into a hole 7 formed in the center of the hanging fitting 3 to lift heavy objects of various types of equipment.

0003

[Problems to be Solved by the Invention] The conventional method for attaching a hanging bracket requires welding work to be performed all around the entire circumference of the hanging bracket 3 in an extremely poor working environment, such as welding to the bottom surface of a beam, etc. during work at height. Therefore, it took a lot of time to install. Moreover, cutting work of the welded part is required after welding, which also requires a large number of man-hours, and there has been a demand for reduction of this time.

0004

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for attaching hanging fittings extremely quickly and reliably, and to achieve the object, the following configuration is adopted. That is, the method for attaching the hanging fitting of the present invention is as follows:
It includes a step of welding one or more studs 2 by stud welding to the lower surface of a strength member 1 such as a beam or packer plate installed above. Then, the bolt hole of the hanging fitting 3 is inserted into the stud 2, and the stud 2 is fastened and fixed to the strength member 1 with the nut 8. Alternatively, the stud 2 is characterized in that the suspension locking part 5 is formed at the lower part thereof.

[0005]

Embodiments Next, each embodiment of the present invention will be explained based on the drawings. FIG. 1 shows the first step according to the method of the invention,
FIG. 2 shows the second step. In this embodiment, four studs are welded to the lower surface of a strength member 1 made of a beam suspended horizontally above, thereby fixing a hanging fitting 3 to the strength member 1. Therefore, first, the stud 2 is fitted into a welding gun 11 of a stud welding machine having a control device 9 and a power source 10, and the tip of the stud 2 is welded to the strength member 1 using the positioning plate 6. This positioning plate 6 is made of an electrically insulating material such as ceramic, and has a plurality of holes bored in its surface. Therefore, the tip of the stud 2 is inserted into the hole of the positioning plate 6, an arc is generated between the tip of the stud 2 and the strength member 1, and when a suitable molten pool is generated, the two are rapidly crimped together. , complete stud planting. Then, the welding gun 11 is removed from the planted stud 2. Next, a nut 8 is screwed onto the planted stud 2, and the positioning plate 6 is fastened to the strength member 1. Then, the studs 2 are sequentially inserted into the other holes of the positioning plate 6.
to weld.

[0006] Such welding work of the stud 2 can be performed in an extremely short time. Furthermore, even if the outer periphery of the stud 2 contacts the positioning plate 6 during welding, since the positioning plate 6 is an electrical insulator, no current will flow to the positioning plate 6 side, and all of the welding current will be directed to the tip of the stud 2. The reliability of the welded parts can be ensured by concentrating on the In this manner, in this embodiment, the nut 8 and the positioning plate 6 are removed with the four studs 2 implanted in the strength member 1. Next, the stud 2 is inserted through the bolt insertion hole of the hanging fitting 3 as shown in FIG. 2, and then the nut 8 is screwed onto the stud 2. In this embodiment, a double nut is screwed to prevent loosening. A hole 7 is formed approximately in the center of the hanging fitting 3, and a hook or the like at the upper end of the chain block (not shown) is engaged with the hole 7. Next, FIG. 3 shows a second embodiment of the present invention. This embodiment differs from the previous embodiment in that the protrusion protruding from the lower surface of the hanging fitting 3 is formed in the shape of a rod, and the lower end thereof is formed with a hole. This is because a suspension locking portion 5 is provided.

Next, FIGS. 4 and 5 show another embodiment of the present invention, in which the stud 2 forms the hanging fitting 3 itself. That is, the stud 2 is formed by bending one end of a bar-shaped member to have an annular suspension locking part 5, and the end is welded to the stud 2 itself. Then, the entire stud 2 is held by a welding gun 11 and stud welded directly to the lower surface of the strength member 1. Note that the tip of the stud 2 is generally surrounded by a shield made of ceramic (not shown). When the trigger of the welding gun 11 is pulled, an arc is generated inside the shield, and the strength member 1 and the tip of the stud 2 are melted to form a molten pool. When the arc time preset by the control device 9 (generally 1/3 second to 1 second) has elapsed, the current is automatically cut off and at the same time, the restoring force of the spring built into the welding gun 11 moves the stud 2 into the molten pool. is rapidly pressed and welded. After welding, the shield is broken and removed. The upper end of the chain block, etc. is locked to the hanging locking part 5 of the hanging fitting 3 formed in this way. Note that if such a stud 2 is previously stud-welded to the upper surface of various devices, piping, etc., it will be easier to lift them.

[0008]

[Effects of the Invention] The mounting method of the present invention involves welding and fixing a stud to the lower surface of a metal strength member such as a beam or packer plate by stud welding, and fastening and fixing the hanging fitting by or using the stud itself. Because it is a thing,
Installation work can be completed in a shorter time than with conventional installation methods. In particular, this method improves the safety and speed of work in places with poor work environments due to the difficulty of welding to the lower surface of metal strength members and the work required at heights. It becomes possible to secure it. Furthermore, according to this method, the appearance of the welded surface is good, and there is no need for cutting with a grinder or the like after welding, and from this point of view as well, it is possible to reduce the number of installation steps.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the first step of the first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing the second step of the first embodiment.

FIG. 3 is an explanatory diagram of another hanging fitting according to the method of the present invention.

FIG. 4 is an explanatory diagram of the first step according to another method of the present invention.

FIG. 5 is an explanatory diagram of the second step of the embodiment.

FIG. 6 is a perspective view of a conventional hanging fixture.

[Explanation of symbols]

1 Strength member 2 Stud 3 Hanging bracket 5 Hanging locking part 6 Positioning plate 7 holes 8 Nut 9 Control device 10 Power supply 11 Welding gun 12 Welded part

Claims (1)

[Claims] 1. A step of welding and fixing one or more studs (2) by stud welding to the lower surface of a metal strength member (1) such as a beam or packer plate installed above, ) through the bolt hole of the hanging fitting (3), and fastening and fixing the hanging fitting (3) to the strength member (1) with a nut (8), or suspending it from the bottom of the stud (2) itself. A method for attaching a hanging fitting, characterized in that a locking part (5) is formed.