JPS62296019A - Fixing structure of steel skeleton column base for foundation concrete - Google Patents

Abstract

PURPOSE:To easily and quickly level up the fixing structure of steel skeleton column base by a method in which a column for sliding is provided to foundation concrete, and a base plate movable on the column and a fixable ring are provided to the base of steel skeleton column. CONSTITUTION:One slide column 2 per one steel skeleton column is projectionally provided on a place where steel skeleton column is to be set on the upside of the foundation beam 1b of foundation concrete 1. The column 2 consists of a steel tube 2a buried by exposing its upper end side and concrete 2b packed into the tube 2a. A base plate 4 vertically movable on the column 2 is welded to the base of a steel skeleton column 3 and a fixable ring 5 is provided above the plate 4. In leveling up the steel skeleton column base fixing structure, the fixing is released by the ring 5, the column 3 is raised to a desired height by a lifter 12 and supported on a liner part 13, and the ring 5 is again clamped. The column 3 is then fixed.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention [Field of Industrial Application] The present invention, for example, can shorten the construction period by constructing a structure on reclaimed land at a time when the ground has not yet been stabilized. However, if uneven settlement occurs in the foundation concrete due to variations in the compactness of the fill layer or a sinking ring due to the uneven pressure load of the alluvial clay layer below the fill layer, This invention relates to a structure for fixing a steel column pedestal to a concrete foundation for carrying out the so-called structure elevating method in which the structure is raised to maintain its levelness.

[Conventional technology]

As this type of structure for fixing the base of a steel column to a concrete foundation, the structure described in Japanese Patent Publication No. 17005/1983 is known. FIG. 5 shows the above-mentioned conventional example, with the right half of the figure showing the state before raising the height, and the left half of the figure showing the state after completing the raising.

This steel column base fixing structure consists of a double nut (a) welded near the upper opening, a fixing vibrator (d) filled with wood plugs and grease (C), and four to eight nuts per steel column (e). Insert the upper ends of the embedded bolts f screwed into the double nuts a into the base plates h of the steel column g, and normally tighten the base plates h with the nuts i and j screwed into the embedded bolds f. When fixing and raising the height, while rotating the embedded bold f and loosening the nut i, attach the bolt k to the base plate h.
It is raised to a desired height using a lifting tool (not shown), which is tightened through the wire.

[Problem that the invention seeks to solve]

According to the above-mentioned conventional example, since the structure can be raised in parallel with the subsidence of the ground, construction of the structure can be started early after the reclamation is completed, making it possible to significantly shorten the construction period.However, the following points apply. There was room for improvement. That is, (1) It is troublesome to weld the double napht a inside the fixing vibe d to the position a' with matching thread grooves, and the base plate h of the steel column g is fixed to the foundation concrete e with the embedded bold f. Because of the structure, each steel column requires 4 to 8 embedded balls (f) and fixing pipes (d), and ensuring the accuracy of the embedded position and verticality of the fixing common tube (d) becomes a hassle, and overall Poor workability.

(2) When raising the height, it is necessary to pull out all the embedded bolts f screwed onto the double napfts a of each fixing pipe d to a desired height in advance, which results in poor workability during raising the height.

(3) Since each embedded bold f is used as a guide rail for sliding and the column base is raised, pace play) h
When the edge of the bolt hole strongly contacts the embedded bold f,
The embedded bold f is bent or the embedded bold f
The threads may prevent smooth lifting, or some of the threads may collapse, making it difficult to rotate the nut j that supports the lower surface of the pace brake.

In view of the above conventional drawbacks, the present invention seeks to provide a structure for fixing a steel frame column base to a concrete foundation, which has good workability and allows for easy and quick elevating work.

[Means for solving problems]

The feature of the structure for fixing steel column legs to foundation concrete according to the present invention is that one sliding column per steel column is provided protruding from the upper surface of the foundation concrete, while the column base of the steel column is an annular base plate fitted on the base plate so as to be movable up and down, and a ring that can be switched between a state in which it is tightened and fixed to the column body and a state in which it is loosened, and a state in which the tightening by the ring is loosened. The structure is such that the steel column can be raised using the column body as a guide by a lifting tool interposed between the foundation concrete and the floor beam connected to the steel column.

[Effect]

According to the above configuration, when the steel frame is erected, the annular base plate is fitted over the column body, so that the steel frame column stands on its own on the foundation concrete.

Although there is some gap between the outer peripheral surface of the column and the hole edge of the annular base plate, horizontal movement of the column base is restrained by tightening and fixing the ring to the column.

When loosening the tightness of the ring and raising a steel column, you can use the column body as a guide to raise it smoothly.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

In the figure, reference numeral 1 denotes a floating foundation type foundation concrete, which has a rectangular box shape consisting of a foundation base plate 1a and a foundation beam 1b, and is designed to prevent cracks in the foundation base plate 1a and foundation beams 1b due to bending moments that occur due to uneven settlement. Prestress is introduced to the minimum by the PC steel material embedded in the foundation bottom slab 1a and the foundation beam 1b so that they behave as elastic bodies.

On the upper surface of the foundation 'A11) of the foundation concrete 1, one sliding column 2 for each steel column is protruded at the planned construction position of each steel column. This column 2 has sufficient strength so that even just one column will not hinder the fixing of the column base, and specifically, the upper end side is exposed to the foundation beam 1b of the foundation concrete 1. It is composed of a steel pipe 2a with a circular cross section and an appropriate diameter embedded in the steel pipe 2a, and concrete 2b filled inside the pipe 2a.

Reference numeral 3 designates a square pipe-shaped steel column, and an annular base plate 4 having a round hole slightly larger than the diameter of the column 2 is welded to the column base, and is movable up and down with respect to the column 2. It is stuck in a state of being. Further, a ring 5 made of a steel plate is provided on the column base at a position above the base plate 4 and can be switched between a state in which it is tightened and fixed to the column 2 and a state in which it is loosened.

As shown in FIGS. 2 and 3, the ring 5 is composed of four members each having bolt tightening protrusions 6b provided at both ends of an arcuate plate portion 6a. The projecting pieces 6b are arranged radially on the top surface of the base plate 4 and are fixed by tightening them to the four welded brackets 7 using poles 8a and naphts 8b.
The structure is such that when loosening 8b, the ring 5 is released from being fastened to the column 2.

Note that the bolt hole of the bracket 7 is formed to be slightly larger in diameter than the bolt 8a. Each bracket 7 of the steel column 3
Openings 9 are formed at positions corresponding to the bolts 8a and nuts 8b, respectively, into which a tool such as a wrench is inserted to operate the bolts 8a and nuts 8b.

In Figure 1, 10 is the floor beam of the first floor connected to the steel column 3, 1
1 is the floor, for example, reinforcement is arranged on the deck plate,
It is constructed by pouring concrete.

According to the above configuration, by fitting the base plate 4 to the column body 2, the steel column 3 becomes independent on the foundation concrete 10 foundation beam lb (specifically, on top of the level-adjusted mortar). Erection of steel frames can be done easily and safely.

At all times, the base plate 4 of the steel column 3 is supported by the foundation beam 1b of the foundation concrete 1, and the ring 5
are tightened and fixed to the column body 2 to restrain the horizontal movement of the steel column 3. When raising the height, as shown in Fig. 4 (a), the foundation beam 1b of the foundation concrete 1 and the steel column 3 A lifting tool 12 such as a hydraulic jack is interposed between the floor beam 10 of the first floor connected to the steel column 3, and with the ring 5 loosened,
After raising the liner material 13 of the same size as the raising height under the base plate 4 as shown in the fourth [1 (b)], remove the raising tool 12 and raise the base plate 4 to the liner material 13. In this state, the ring 5 is tightened again to restrain horizontal movement.

According to the above-mentioned column base fixed structure, even if the foundation concrete 1 is tilted due to uneven settlement, the upper structure can be kept level by raising the column base, and consolidation settlement like in reclaimed land is expected. Suitable for early construction of airport buildings, hangars, and other buildings on the ground.

If there is not a large working space under the floor beam 10, as shown in FIG. It is desirable to form a through hole 14 that will be a passage when carrying it, and also inside the steel column 3 and the base plate 4.
An annular plate or columnar body 2 having a hole of the same size as the round hole of the base plate 4 at an appropriate distance above the base plate 4.
It is also possible to weld a plurality of protruding pieces close to the outer circumferential surface of the steel column 3 to prevent the steel column 3 from steadying against the column body 2.

〔Effect of the invention〕

The present invention can achieve the following effects with the above-described configuration.
It is.

■As mentioned at the beginning, one slide column per each steel column was erected on the foundation concrete, and this column was used as a guide to raise the steel column.
4 to 4 fixing pipes with double nuts per steel column
Compared to the conventional example, where eight steel columns were embedded in the foundation concrete and the steel columns were raised using the embedded bolds that threadedly engaged with the double Nand of each anchoring pipe as guides,
The structure is simple, and it is easy to construct the columns with precision.In addition, by fitting the annular base plate of the steel column into the column, the steel column stands on the foundation concrete, making it easy to erect the steel frame. It is also safe and has good workability.

■When raising the height of a structure, the fixed state of the column base to the column can be released by simply loosening the ring, eliminating the need to raise a large number of embedded bolds to the desired height in advance as in the conventional example above. The workability of raising the height is good, and since raising is performed using a single pillar as a guide, there are no problems such as bending of the embedded bold, catching the embedded bold on the screw thread, or crushing of the screw thread as in the conventional method. There is no risk of this occurring, and the raising of steel columns (raising the height of the structure) can be carried out smoothly.

[Brief explanation of the drawing]

Figures 1 to 4 (A) and (B) show one embodiment of the present invention; Figure 1 is a schematic sectional view showing a structure for fixing a steel column base to foundation concrete of a floating foundation type;
The figure is a partially cutaway perspective view of the main part, Fig. 3 is a cross-sectional plan view of the main part, and Fig. 4 (A). (B) is a longitudinal cross-sectional side view of the main part explaining the raising procedure. FIG. 5 is a longitudinal sectional side view showing a conventional example. 1...Foundation concrete, 2...Slide column,
3... Steel column, 4... Base plate, 5... Ring, 10... Floor beam, 12... Raising tool.

Claims (2)

[Claims] (1) One slide column per each steel column is protruded from the top surface of the foundation concrete, and a slide column is fitted onto the base of the steel column so that it can move up and down with respect to the column. The floor is connected to the foundation concrete and the steel column in a state where the ring is loosened and the ring is loosened. A structure for fixing a steel column base to a concrete foundation, characterized in that the steel column can be raised using the column body as a guide using a raising tool interposed between the column and the beam. (2) A patent characterized in that the slide column is composed of a steel pipe with a circular cross section embedded in the foundation concrete with its upper end exposed, and concrete filled inside the steel pipe. A structure for fixing a steel column base to foundation concrete according to claim (1).