JPH0237457B2 - TETSUKOTSUHASHIRANOKYAKUBUNOKOTEIHOHO - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for fixing the legs of a steel column onto a base concrete.

Conventionally, as shown in Fig. 1, a base plate 2 is fixed to the lower end of a steel column 1 in advance, base mortar 4 is heaped up on the top of the base concrete 3, and after a predetermined curing period has elapsed. After placing the steel column 1 on this base mortar 4 as shown in FIG. Base mortar 7 was further filled into the gap.

This resulted in the following drawbacks.

Because the base mortar is piled up on the top of the base concrete and the steel columns are placed after it hardens, the marking position (usually, in this case, the core marking is marked based on the relief marking) cannot be determined accurately. This work was time-consuming, and the base mortar installation work and filling work could not be performed reliably.

If the anchor bolts were buried incorrectly, they would have to be rebuilt, which took a lot of time and effort.

During construction, the column bases often shifted horizontally.

The present invention solves these drawbacks, and
Separate the steel column and base plate, install base mortar on the top of the base concrete, embed the base plate on this base mortar before it hardens, fix it to the anchor material, and then mark out the specified markings on the top surface of the base plate. , is characterized by welding the lower end of the steel column to its upper surface on site.

Examples of the present invention will be described below.

3 to 6 show a first embodiment of the invention. Third
In the figure, the top end 11 of the base concrete 10
A recess 12 of a predetermined size and depth is formed during molding, and a plurality of anchor bolts 13 are embedded in the recess 12 as anchor materials. The bottom surface of the recess 12 is a horizontal surface, and the circumferential surface is an inclined surface that slopes downward from the outside toward the inside.

First, the height adjustment nut 14 is screwed onto the anchor bolt 13 at a predetermined height position, and then the recess 1 is inserted.
2, a non-shrinkable base mortar 15 is installed at a medium height, and before the base mortar 15 hardens, the anchor bolts 13 are inserted into the loose holes 17 of the base plate 16, as shown in FIG.
is penetrated, and the base plate 16 is embedded in the base mortar 15 while being hammered until its lower surface abuts the upper surface of the height adjusting nut 14. That is, the base plate 16 is supported on the height adjustment nut 14 as a temporary support member. after that,
Fixing nut 18 on the threaded part of anchor bolt 13
The base plate 16 is tightened by screwing them together. The overflowing portion 19 of the base mortar 15 overflowing from the recess 12 due to the embedding of the base plate 16 is
Remove after hardening or in semi-hardened state.

Next, a steel column 20 is placed on the top surface of the base plate 16.
(Fig. 5), and on the base plate 16 there is also a rib plate 2 which also serves as an erection piece.
After welding 1, the steel column 20 is attached to the base plate 1.
The erection piece rib plate 22 fixed to the steel column 20 and the rib plate 21 are bolted to each other as shown in FIG. 6, and the steel column 20 is positioned on the base plate 16. Thereafter, the lower end of the steel column 20 is welded to the upper surface of the base plate 16.

As shown in FIGS. 7 and 8, the rib plate 21 on the base plate 16 side is made wider than the rib plate 22 on the steel column 20 side, and both rib plates 21 and 22 are welded to the steel column 20 and the base plate 16. If welding is performed before the work, distortion caused by welding between the steel column 20 and the base plate 16 will be reduced as much as possible.

In the second embodiment shown in FIGS. 9 to 12, the base mortar 15 is heaped up on the top end 11 of the base concrete 10, and before it hardens, the base plate 16 is embedded until it abuts on the height adjustment nut 14. After tightening the anchor bolt 13 with the fixing nut 18, the bulging portion 23 of the base mortar 15 is removed, and then the steel column 20 is welded onto the base plate 16 in the same manner as in the first embodiment. be.

In both the first and second embodiments, an anchor bolt is used as the anchor material and the base plate is fastened to the anchor bolt.
The third embodiment shown in Fig. 17 has as an anchor material:
Deformed reinforcing bars, which are used as main reinforcing bars in concrete structures, are used and welded to the base plate.

That is, as shown in FIG. 13, a plurality of deformed reinforcing bars 24 are buried in the recess 12 of the base concrete 10 as anchor materials. First of all,
After spot-welding a temporary support material (such as L-shaped steel) 25 to a predetermined height position of the protrusion of the deformed reinforcing bar 24 as shown in FIG. Install mortar 15.

The base plate 26 used in the third embodiment has an inverted truncated cone-shaped loose hole 27 whose inner diameter gradually increases toward its upper surface, and a ring-shaped lower surface aligned with the loose hole 27. The backing material 28 is in contact with the backing material 28. Before the base mortar 15 hardens, the protrusion of the deformed reinforcing bar 24 is passed through the loose hole 27 as shown in FIG. The base plate 26 is embedded in the base mortar 15 until it comes into contact with the upper surface of the receiving material 25. Thereafter, the lower surface of the temporary holding material (for example, L-shaped steel) 29 is brought into contact with the upper surface of the base plate 26, and the side surface of the temporary holding material 29 and the side surface of the deformed reinforcing bar 24 are spot welded.

After the base mortar 15 hardens, as shown in FIG.
Weld the entire circumference between the outer circumferential surface of the After that, the temporary holding material 29 is removed. Also, base mortar 1
The overflowing portion 19 of No. 5 is removed after curing or at the time of semi-curing.

After fixing the base plate 26 in this manner, the lower end of the steel column is welded to its upper surface in the same manner as in the first or second embodiment.

In the case of the third embodiment, the outer circumferential surface of the deformed reinforcing bar 24 serving as the anchor material and the inner circumferential surface of the loose hole 27 of the base plate 26 are welded. can be regarded as. Also, compared to the first and second embodiments,
In particular, the tolerance for embedding accuracy in the height direction of the anchor material is further increased, so that the installation work of the anchor material can be completed in a shorter time.

As described above, the present invention has the following effects.

Because the base plate is separated from the steel column and embedded in the base mortar before it hardens, the base plate can be installed accurately horizontally, making marking work easier and improving marking accuracy. Mortar installation work and filling work can be performed reliably.

After separating the steel column and base plate, embedding the base plate in base mortar and fixing it to the anchor material, the steel column is welded onto the base plate on site, which eliminates the need for resetting the anchor material and also reduces the need for anchor material. At the time of installation, the tolerance of the anchor material embedding precision with respect to the reinforcing bar assembly precision is large, and the anchor material installation work is easy and can be completed in a short time.

Since the reinforcing column is erected after the base plate is fixed on the base mortar, horizontal displacement of the column base can be minimized.

If a method is adopted in which the inner peripheral surface of the loose hole penetrated through the base plate is welded to the outer peripheral surface of the anchor material, it is possible to It can be considered that the stress in columns and beams is reduced,
The amount of steel used in steel frames will be reduced.

[Brief explanation of drawings]

Figures 1 and 2 are explanatory diagrams showing the conventional method, and Figures 3-
Fig. 6 is an explanatory diagram showing the first embodiment of the present invention according to the construction procedure, Figs. 7 and 8 are explanatory diagrams showing partial modifications to the first embodiment, and Figs. 9 to 12 are explanatory diagrams showing the second embodiment. , and FIGS. 13 to 17 are explanatory diagrams showing the third embodiment according to the construction procedure, respectively. 10...Base concrete, 11...Top,
12... Concavity, 13, 24... Anchor bolt and deformed reinforcing bar serving as anchor material, 14... Height adjustment nut (temporary support material), 15... Base mortar,
16, 26...base plate, 20...steel column, 25...temporary support material, 27...loose hole.

Claims (1)

[Claims] 1. A base mortar is installed at the top of the base concrete in which the anchor material is buried, and before the base mortar hardens, the anchor material is passed through the loose ball of the base plate, and the anchor material is embedded in the anchor material. On the other hand, after supporting the base plate horizontally through a temporary support material and embedding it in base mortar, a prescribed marking is made on the upper surface of the base plate, and the lower end of the steel column is welded to the upper surface. How to fix the part. 2 Form a recess at the top of the base concrete,
A method for fixing a leg of a steel frame column according to claim 1, characterized in that a base mortar is installed in the recess. 3. A method for fixing a leg of a steel frame column according to claim 1 or 2, which comprises welding between the inner circumferential surface of the loose hole and the outer circumferential surface of the anchor material.