JPH0322423Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a metal pipe joining structure suitable for forming a scaffold frame or the like by welding and joining a required number of metal pipes.

[Conventional technology]

For example, the scaffolding frame 1 used when constructing scaffolding for various construction works is as shown in Fig. 3.
A pair of metal pipe supports 2 on both sides, a metal pipe horizontal member 3 installed at the upper end between both supports 2, and a metal pipe member 3 that connects the horizontal member 3 and both supports 2 in a substantially strut shape. The pillar 2, the horizontal member 3, and the reinforcing member 4 are welded and joined to each other to form a gate-shaped or torii-shaped structure. The scaffolding frame 1 is generally coated with hot-dip galvanizing or the like in order to provide corrosion resistance. When performing such hot-dip galvanizing, etc., especially for those constructed by welding and joining metal pipes like the scaffolding frame 1, in order to ensure smooth inflow and outflow of the plating liquid during the plating process,
Air holes of a required diameter must be formed in the welded joint.

Conventionally, as shown in FIGS. 4 and 5, the joint structure of the scaffolding frame 1 involves drilling air holes 5 in advance near the joint of the reinforcing member 4, and roughening the end surface of the joint. After that, the pillars 2 and horizontal members 3
Alternatively, as shown in FIG. 6 and FIG. After processing the end face into a curved shape along the surface, it was welded and joined to the pillar 2, etc.

[Problem that the invention attempts to solve]

However, in the conventional joining structure, the air holes 5, 15 are formed at a location away from the welded end surface, so when hot-dip galvanizing, etc. The interior is recessed, which particularly impedes the inflow and outflow of the plating solution, which not only takes time for plating, but also causes the plating solution to accumulate when the plating bath is removed. Further, since the drilling of the air holes 5 and 15 in the reinforcing member 4 and the processing of the joint end faces are each performed separately, the processing steps are two, which is extremely troublesome.

This invention not only solves the conventional problems at once and allows the plating liquid to flow in and out extremely smoothly, but also allows the notch for air venting at the joint of metal pipes to be processed in one piece along with the processing of the joint end surface.
The purpose is to provide a very practical metal pipe joining structure that can be performed in a process.

[Means for solving problems]

That is, in this invention, when a required number of metal pipes are welded and joined to form a required article such as a scaffold frame, a notch 25 for air venting is formed on the joint end surface of one of the metal pipes at the joint. This is what I did.

[Effect]

Since the notch 25 for air venting is formed on the end face of one of the metal pipes where the joint is placed, there is no accumulation of plating liquid in the welded joint, and the plating liquid can smoothly flow in and out. Also notch 2
Step 5 can be performed in one step together with the end face processing of the metal pipe, which saves processing time.

〔Example〕

Below, this idea is shown in Figures 1 and 2.
An example will be explained.

4 is the metal pipe support 2 and horizontal members 3 of the scaffolding frame 1
A metal pipe reinforcing member 25 is a notch for air vent formed on both sides of the joining end surface of the reinforcing member 4, and the notch 25 is formed on the reinforcing member before joining. This is done together with the joint end face processing in step 4.

When applying hot-dip galvanizing, etc., the inside of the joint can be freely communicated directly with the outside, allowing the plating solution to flow in and out smoothly, and eliminating stagnation or accumulation of the plating solution.

In addition, although the above-mentioned Example showed the joining structure of the metal pipe in the scaffolding frame 1, it is not limited to this, and of course can be applied to other products of this type. Also, notch 2
The number of 5s only needs to be at least one, and may be increased freely.

[Effect of idea]

According to this invention, as described above, the notch 25 for air venting is formed on the joint end surface of one of the metal pipes at the joint, so there is no recess in the weld joint as in the past, and the plating liquid stagnates. The inflow and outflow will be smooth without any problems,
Not only can the plating time be shortened, but there is no risk of plating liquid accumulating even when the plating solution is pulled out of the plating bath, and as a result, the cost during plating processing can be reduced.

In addition, the air vent notch 25 can be formed in one process together with the end face processing of the metal pipe before joining, so there is no need to process each separately as in the past, and it can be done in one process. This has the practical effect of simplifying the process.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view, Fig. 2 is a sectional view taken along the line A-A in Fig. 1, Fig. 3 is a front view showing the scaffolding frame 1, and Fig. 4 is a partial view showing a conventional example. FIG. 5 is a cutaway side view, FIG. 5 is a sectional view showing the same front, FIG. 6 is a partially cutaway side view showing another conventional example, and FIG. 7 is a sectional view showing the front. 1...Scaffolding frame, 2...Column, 3...Horizontal member, 4
... Reinforcement member, 25 ... Notch.

Claims (1)

[Scope of utility model registration request] Joining of metal pipes by welding and joining the required number of metal pipes to form a required article such as a scaffolding frame, by forming a notch for air vent on the joint end surface of one of the metal pipes at the joint. structure.