JPH02308046A - Fire resistance coating method of iron and steel material - Google Patents

Abstract

PURPOSE:To save energy for the process of fire resisting material coating and to promote efficiency by inserting a pin material bringing a fire resisting material of inorganic fiber into contact with an iron and steel material up to the surface of the iron and steel while pushing and rotating it with a welding gun to weld it. CONSTITUTION:An insulating fire resisting material 3 of inorganic fiber is wound on a double-U steel beam 1, and a pin 2 secured with a washer 2a is inserted thereinto. After that, the pin 2 is rotated about 50 - 90 times while pushing a welding gun B to the washer 2a thereof. Contact frictional force is generated by pushing rotation, and the end of the pin 2 is brought into contact with a weld part capable of power through an insulating layer 6. In such a state, a switch of the welding gun is turned ON to energize power, and the end of the pin 2 is welded to the surface of the iron and steel material 1. According to the constitution, an elimination treatment of oxidizing film on the surface of the iron and steel material or the insulating layer of painting, etc. can not be required.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement in a fire-resistant coating method for covering steel materials such as steel frames and steel plates of buildings with a fire-resistant material mainly made of inorganic fibers. .

[Conventional technology] Conventionally, this method was used to coat steel frames such as beams and columns of buildings with fireproof materials mainly made of inorganic fibers.

The construction method shown in FIGS. 7A to 7C is known.

That is, as shown in FIG. 7A, first, a latching member 2 such as a pin or stud bolt is fixed to the steel frame 1 using a welding gun, and then, as shown in FIG. Insert the material 3 into the latching member 2, and in the case of a pin, firmly fit the washer 4 as shown in Fig. 7C, or bend the tip of the pin after fitting the washer to fix it, and then tighten the stud. In the case of bolts, this method involves screwing in a washer.

The above fireproof coating method involves wrapping fireproof material around a steel frame, using pins,
The feature is that it is a simple construction method that only needs to be fastened with a latching member such as a stud bolt.

[Problems to be Solved by the Invention] However, in the above fireproof coating method, as shown in FIG. 8A, there is an oxide film 1a caused by rust on the surface of the steel frame,
Alternatively, as shown in Figure 8B, if the steel frame is coated with a rust-preventing paint film 1b, this becomes an insulating layer and cannot be welded, so it is necessary to remove the insulating layer in advance with a polisher 5, and remove it by polishing. The work requires a lot of time and effort.

In addition, in a construction method such as the above-mentioned fireproof coating method, in which a large number of latch members are first welded to the surface of the steel frame and a fireproof material is inserted therein, even if the fireproof material is misaligned, it can be easily fixed. There are some inconvenient aspects that cannot be fixed. This can be solved, for example, by first applying a refractory material to the surface of the steel frame, inserting a latching member from the outside, and welding it with a welding gun. Moreover, according to this construction method, it is also possible to use a latch member with a washer. However, since it is not possible to polish and remove the insulating layer described above after applying refractory material to the surface of the steel frame, at least for steel frames that require polishing removal, the method of applying the refractory material described above first is adopted. I can't.

[Object of the Invention] The present invention has been made in view of the above problems, and it eliminates the need for surface polishing of the steel frame, and in addition, the latching member is attached with a welding gun after applying a refractory material to the steel frame. The purpose is to provide a fireproof coating construction method that can be welded.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a fireproof coating method for covering steel materials with a fireproof material mainly made of inorganic fibers.
Apply the fireproof material to the steel material.

The latching member inserted into the latching member or the latching member with a retainer is pressed and rotated by operating a welding gun, and the tip of the latching member is then welded through an insulating layer such as an oxide film or paint film on the surface of the steel material. Enter until 1
Next, welding is performed using a welding gun to solve the above-mentioned problems.

[Function] According to the fireproof coating method, even if there is an insulating layer on the surface of the steel material, the tip of the latching member enters the weldable part through the insulating layer due to the pressing rotational force applied to it. , welding is possible without polishing and removing the insulating layer. In addition, in the case of pressing rotational force, the latching member enters the weldable part in a static state, so that the position does not shift immediately after entering.

[Example] Figures 1, 2, 3 and 3A show examples of the fireproof coating method according to the present invention, and members that are the same or similar to those in Figures 7A to 7C are The same symbols are attached.

That is, 1 is an H-shaped beam steel frame, 2 is a pin as a latching member,
2a is a washer fixed to a pin, 3 is a felt-like fireproof material mainly made of inorganic fibers, and A is a ceiling slab.

First, wrap the refractory material 3 around the steel frame 1 and temporarily secure it.
Insert the pin 2 with washer into the required position.

Next, as shown in Fig. 2, the tip of the welding gun B is placed on the washer 2a of the pin 2 inserted into the refractory material 3, and rotated by 50 to 90 degrees in the direction of the arrow while pressing. A contact friction force is generated between the welding gun tip and the washer 2a, and the pin 2 is pushed and rotated in the same direction, so that the pin tip comes into contact with the welding part that can conduct electricity through the insulating layer 6. Then, in that state By turning on the welding gun and applying electricity, the tip of the pin is welded to the surface of the steel material 1.

When applying a pressing rotational force to the pin, it is preferable to penetrate the insulating layer 6 on the surface of the steel frame and bring the tip of the pin into contact with the surface of the steel frame. Even in the biting state, electricity can be applied.

It is preferable that the pin used as the latching member has its tip hardened by hardening treatment. This not only makes it easier for the pin to bite into the insulating layer, but also allows the pin to bite into the inside of the iron material, which is effective in stably strengthening the weld.

The shape of the tip of the pin 2 may be needle-shaped as shown in FIGS. 3 and 3A, but it is also possible to have a rectangular tip 2' as shown in FIG. 3B. For example, when the pin is pressed and rotated, the insulating layer is removed in a circular shape, and the contact area between the rectangular tip 2'' and the weldable part is larger than that of the needle-shaped tip described above, which is advantageous in terms of electrical conductivity. There is also the advantage that even if a slight deviation occurs in the contact of the tip, contact with the weldable part can be maintained.

Further, in FIG. 3, the retaining washer 2a provided on the head of the pin 2 is a circular plate, but it is not limited to this, and may be a rectangular plate 2b as shown in FIG. 4, or as shown in FIG. A cross-shaped plate 2c can be used. Further, as shown in FIG. 6, a bent portion 2 formed by bending the head of the pin 2
It can also be used with d in place of a washer.

On the other hand, it is preferable to select a material and shape for the tip of the welding gun that is placed against the washer for preventing the pin from coming off, so that it can maintain a large contact friction force with the washer. If the pin is attached, the pin can be held by suction, thereby strengthening the contact friction force and improving workability.

In addition, as shown in FIG.
Since the contact friction force with the tip of the welding gun is small, for example, a groove is provided at the tip of the welding gun and the bent part 2d is received in the groove. good. Also, when using pins without washers,
A pin-gripping chuck may be provided at the tip of the welding gun to transmit rotational force.

In the above embodiment, a felt-like material is used as the refractory material 3, but it can also be used for a fibrous molded plate and coated on a steel material in the same manner as described above.

[Effects of the Invention] As described above, according to the present invention, in the fireproof coating method of coating steel materials with a fireproof material formed mainly of inorganic fibers, insulation by an oxide film or a paint film on the surface of the steel materials is achieved. There is no need to polish the layers, and the latching member can be welded with the refractory material applied to the steel material first.
In addition, it is possible to use a latch member with a retainer, so
It is possible to significantly save labor and improve efficiency of the fireproof coating method.

In particular, according to the method of the present invention, a pressing rotational force is applied to a latching member to be welded to a steel material, and the tip of the latching member enters a weldable part through an insulating layer on the surface of the steel material.
The latching member statically enters the part that can be welded without vibration and is maintained at that entry position, so there is no risk of the position shifting immediately after entry.If vibration causes the switch on the welding gun to When the switch is turned on by mistake or when the switch is turned on without being aware of the position shift due to vibration, the tip of the latching member comes into contact with the insulating layer part and the current is not supplied. However, according to the method of the present invention, , it is possible to ensure the welding work without making such welding mistakes.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a steel frame portion showing a state in which the steel frame is coated with a refractory material using the construction method of the present invention, and FIG. 2 is a partially enlarged sectional view showing a state of welding with a welding gun. Fig. 3 is a perspective view of a pin with a washer, Fig. 3A is an enlarged perspective view of the tip of the pin, Fig. 3B is a perspective view of the rectangular tip of the pin, and Figs. 4 to 6 show pins with washers of various shapes. The perspective view and FIGS. 7A to 7C are side views of a steel frame portion showing a conventional construction method, and FIGS. 8A and 8B are side views of a steel frame portion showing a polishing process for an insulating layer on the surface of the steel frame. 1... Steel frame, 2... Pin, 2a... Washer, 3......
Fireproof material, 4...Washer, 5...
··Polishing machine. 1a... Oxide film, 1b...
・Paint film, 6...Insulating layer, A...
...Ceiling slab, B...Welding gun. Patent applicant Nichias Co., Ltd. Agent Patent attorney Nagai 1) Takesanbe Figure 3 Figure 3A Figure 3B Figure 4 Figure 5 Figure 8

Claims (1)

[Claims] In the fireproof coating method, in which steel materials are coated with fireproof materials made mainly of inorganic fibers, the fireproof materials are applied to the steel materials, and the latching members inserted into it or the latching members with retainers are pressed by operating a welding gun. A method for fireproof coating of steel materials, characterized by rotating the latching member so that the tip of the latching member penetrates through the insulating layer of the oxide film or paint film on the surface of the steel material to a weldable part, and then welding is performed with a welding gun. .