JPS5858502B2 - Bolt tightening method for architectural steel pipes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for bolting architectural steel pipes used in steel-framed buildings.

Square steel pipes are often used for columns in steel-framed buildings, but connecting square pipes together is quite difficult.

That is, it is often structurally impossible to use a bolt through a square tube, and the bolt connection cannot be made unless the nut is accurately placed inside the square tube.

Usually, the square tubes 1atlb are brought together as shown in FIG. 2, but one square tube 1
Although it is relatively easy to attach the connecting member 2 to the connecting member 2, it is troublesome to attach the connecting member 2 to the other square tube 1a after the connecting member 2 is attached to the other square tube 1a.

Therefore, when tightening the bolts 3 when attaching the square tube 1a to the connecting member 2 from behind, for example, as shown in FIG.
As shown in FIG.
Alternatively, as shown in FIG. 1, a method is adopted in which a bolt insertion hole 5 is provided in the connecting member 2 and a nut 6 is welded inside the bolt insertion hole 5.

However, the former has the disadvantage that a considerably high processing precision is required when providing the tapped hole 4 in the connecting member 2, and the latter has the disadvantage that the welding of the nut 6 to the connecting member 2 tilts the axis of the nut 6. This is often the case, and the solution layer often adheres to the threaded hole of the nut 6, making it difficult to screw the bolt 3 together.

On the other hand, as shown in FIG. 2, a method of embedding a nut 8 in the side surface 7 inside the connecting member 2 and applying a mounting member 9 to fasten it can also be considered, but this holding member 9 is inserted into the steel pipe. There is the inconvenience of having to leave it behind.

An object of the present invention is to eliminate the above-mentioned drawbacks and to easily insert and tighten a bolt from the outside by properly guiding the nut by using a reusable nut holding member inside the bolt insertion hole of a connecting member. The purpose of this method is to provide a bolt-fastening method for architectural steel pipes, which allows steel pipes with bolt insertion holes to be drilled in advance to be bolted together through a connecting member.
When connecting with nuts, a cylindrical connecting member that matches the internal shape of the steel pipe and has bolt insertion holes drilled at the same positions as the first and second steel pipes to be connected is fixed to the first steel pipe. , a second steel pipe is attached to the connecting member, and a nut prevention member that conforms to the internal shape of the connecting member and is temporarily fixed so that it cannot rotate or fall off is attached from the other end of the second steel pipe. Insert the nut into the connecting member using a push rod fixed to the nut prevention member so that the nut is positioned inside the bolt insertion hole of the steel pipe and the bolt insertion hole of the connecting member, and insert the nut from the outside of the steel pipe. After screwing with the nut,
It is characterized in that the nut holding member is pulled out with the nut remaining.

The method according to the present invention will be explained in detail based on the embodiment illustrated in FIG. 3 and below.

Note that the same reference numerals as in FIG. 1 indicate the same members.

FIG. 3 shows a nut holding member 10 for realizing the method according to the present invention, in which a groove 12 with an open lower end is formed on the side surface of an inner body 11 made of steel and having a cavity inside. 13a'lx
By setting the width of the groove 12 to an appropriate size, the groove 12 is mounted non-rotatably.

In this installation, for example, a U-shaped permanent magnet 14 with an open bottom is used to attract and temporarily fix the oak N3a.

The upper part of the inner body 11 is a locking part 15 for connecting the connecting member 2, and the top surface of the locking part 15 is a square pipe 1a to be connected.
A longer pushing rod 16 is attached.

The connecting member 2 has two bolt insertion holes 17a, upper and lower, in advance.
17b & is inserted until the locking part 15 at the upper end of the holding member 10 comes into contact with the end 18 of the connecting member 2, and the shaft of the oak 13a attached to the holding member 10 is inserted into the insertion hole 17a at the upper part of the connecting member 2. Construct so that the heart and mind are in agreement.

When connecting the square tubes 1a and 1b, first connect this connecting member 2.
A bolt insertion hole 19b that matches the bolt insertion hole 14b of the connecting member 2 is drilled in advance at the end of the square tube 1b, and a fourth
As shown in the figure, pass the bolt 20 from the outside and insert your hand from the inside to screw the nut 13b.

Next, the nut 13a is attached to the other square tube Ia to be connected and the connecting member 2, and the nut 13a is inserted into the square tube 1a by pushing the holding member 10 through the opening at the other end of the square tube 1a.

The holding member 10 is pushed in via its push rod 16 until the locking portion 15 of the nut holding member 10 abuts against the end portion 18 of the connecting member 2.

Then, the bolts 20 are inserted and tightened from the outside of the square tube 1a, since the oak 13a is precisely located inside the insertion hole 1.7a of the connecting member 2 and the bolt insertion hole 19a of the square tube 1a.

However, when tightening, if the holding member 10 is left unattended until it is sufficiently tightened, the puck 13a will bite into the groove 12 of the holding member 10, and the lug H3a will become stuck in the groove 12.
It becomes impossible to pull it out.

Therefore, when the bolt 20 and nut 13a are screwed together to a certain extent, the holding member 10 is pulled up by the push rod 16, separated from the permanent magnet 14, and slid in the groove 12. It is necessary to leave the nut 13a.

Then, when the bolt 20 is tightened again, the bolt 13a can be sufficiently fastened without idling.

In the above-mentioned embodiment, a square tube was explained, but even if the steel tube is a round tube, it can be implemented in the same manner as a square tube if the external shape of the holding member is matched to the internal shape of the round tube.

However, it may be necessary to rotate the holding member and the round tube relatively to align the axis of the nut with the bolt insertion hole of the round tube.

As explained above, the method for fastening bolts for construction steel pipes according to the present invention uses a reusable nut holding member to place the nut at a predetermined position inside the steel pipe, and to hold the nut in a non-rotatable manner. Pole) and Y-screwing can be performed from the outside of the steel pipe, which has the advantage of significantly reducing the number of construction steps compared to conventional methods.

[Brief explanation of drawings]

Figures 1a and 1b are cross-sectional views showing a conventional method of connecting steel pipes together, and Figure 2 shows a holding member in which a nut is embedded. A partially cutaway perspective view and FIG. 3 and subsequent figures show an embodiment of the bolt fastening method for architectural steel pipes according to the present invention,
FIG. 3 is a perspective view of the nut holding member, and FIG. 4 is a sectional view of square tubes connected together using this nut holding member. Symbols 1, 1a, 1b are square tubes, 2 is a connecting member, 10 is a nut holding member, 11 is a monthly salary, 12 is a groove, 13a, 13b
is a nut, 14 is a permanent magnet, 15 is a locking portion, 16 is a push rod, 17a, 17b, 19at19b are bolt insertion holes, and 20 is a bolt.

Claims (1)

[Scope of Claims] 1. When connecting steel pipes with bolt insertion holes in advance using bolts and nuts with a connecting member interposed,
A cylindrical connecting member with a bolt insertion hole formed at the same position as the first and second steel pipes to be connected and adapted to the internal shape of the steel pipe is fixed to the first steel pipe, and the connecting member is a second steel pipe. A nut preventing member is attached to the second nut, and is adapted to the internal shape of the connecting member and is temporarily fixed to the nut so that it cannot rotate or fall off.
inserting the nut from the other end of the steel pipe into the inside of the connecting member using a push frame fixed to the nut prevention member, so that the nut is located inside the bolt insertion hole of the steel pipe and the bolt insertion hole of the connecting member, A method of bolting a steel pipe for construction, characterized in that the bolt is inserted from the outside of the steel pipe, and after the pipe is screwed into the nut, the nut holding member is pulled out with the nut retaining member remaining in place. 2. The bolt fastening method for architectural steel pipes according to claim 1, wherein the nut is temporarily fastened to the nut holding member by adsorption of the nut by a permanent magnet.