JP2001173093A - Embedding construction method for steel framed building column - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an embedding construction method for a steel framed building column capable of reducing the term of works and reducing the total cost. SOLUTION: This embedding construction method for a steel frame building column has a process of adjusting the level of a steel-made frame 11 and fixing the frame on a leveling concrete 10, a process of placing foundation concrete 21 in an outer peripheral space of the steel-made frame 11, a process of erecting an embedded part of an iron column 22 in the steel-made frame 11 from above while being aligned with the center and level-adjusted after the foundation concrete 21 is set to a certain degree, and a process of injecting concrete in a space part 33 between the steel-made frame 11 and the iron column 22. The injected concrete is blown out of a mesh panel 16 of the steel-made frame 11 to the periphery of the mesh and made to adhere to the set projecting and recessed concrete surface to be integrated with each other. Thus, the iron column 22 is completely embedded and fixed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of embedding steel building columns.

[0002]

2. Description of the Related Art As is already known, steel columns must be embedded in foundation concrete in accordance with the new seismic design standards. The construction method must be specially approved based on Article 38 of the Ministry of Construction's Building Standard Law.

[0003]

The exposed elastic fixed column base method does not require much time for foundation work, and the construction period is shortened. However, the method requires a cast steel base plate, anchor bolts and other members. It is indispensable, and the base plate is extremely thick, and the anchor bolts must be made very thick, so that the cost is extremely high and the construction cost is high.

[0004] On the other hand, the column-base embedding method does not require a base plate or the like, so that the construction cost is low, but the time required for the foundation work is extended. The reason is that in order to embed the steel pillar in the foundation concrete, it is not possible to cast the foundation concrete unless the steel pillar can be manufactured first. Stop casting and expand the reinforcing bars around the pillar to build the pillar. In this case, since the foundation concrete of the prism cannot support long pillars or buildings, cut the length of the pillar short, fix the pillar base firmly with concrete, build the building, and then weld the cut prism. It must be very time-consuming and time-consuming.

The present invention has been made in view of such a situation, and an object of the present invention is to make it possible to cast foundation concrete at once without using an expensive cast steel base plate, The construction period can be shortened with the same construction period as when a base plate made of steel is used, and the total cost can be reduced.

[0006]

SUMMARY OF THE INVENTION To this end, the present invention provides a tubular steel frame having upper and lower openings, and expanded metal or other mesh panels stretched on the peripheral side surface. A steel frame placing step in which the level is adjusted to a predetermined position and placed, and a concrete placing step in which foundation concrete is placed in the outer peripheral space of the steel frame,
After the foundation concrete is hardened to a certain extent, an embedded portion of the iron column is aligned with the column core from above and the level is adjusted in the steel frame, and the steel column and the iron column are erected. A concrete injecting step of injecting concrete into the space of the above, wherein the injected concrete is blown out from the mesh panel of the steel frame, and is brought into close contact with the hardened irregular surface of the concrete surface and integrated therewith. Thus, the iron pillar is completely embedded and fixed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiment of the present invention will be described. The steel column embedding method according to the present invention is characterized in that a steel frame with a mesh panel is used. First, waste concrete is poured as foundation work, and a steel frame is placed on the waste concrete by adjusting the level of the steel frame. The concrete is placed in the outer peripheral space of the steel frame. Concrete casting process, concrete pillar filling process in which concrete is poured into the space between the steel pole and steel frame, and concrete pouring process in which concrete is poured into the space between the steel pillar and steel frame. is there.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
A description will be given together with the operation. First, as shown in FIG. 1, the steel frame 11 is positioned on the upper surface of the discarded concrete 10 that has been smoothed by ironing, and the steel frame 11 is level-adjusted. Placed horizontally.

As shown in FIGS. 2 to 5, the steel frame 11 has upper and lower rectangular frames 12, 13 and the upper and lower frames 12, 13 welded vertically at four corners thereof. Each of the supporting columns 14, a reinforcing stay 15, which is welded around the four supporting columns 14, and which is welded in a multi-stage manner at an appropriate interval, is stretched by welding to four peripheral surfaces. Includes expanded metal and other mesh panels 16.

The other components of the upper and lower frame members 12 and 13 are steel materials, and the upper and lower frame members 12 and 13 and the support members 14 are L-shaped members provided with single lips to increase the rigidity of the members.

The upper frame 12 is assembled and welded by making the L-shaped steel material into a rectangular shape, with its flange portion facing outward and the lip portion facing downward, and the lower frame member 13 has its flange portion facing outward. Upper frame 1 with lip facing upward
2, a square cylindrical steel frame 11 which is assembled and welded in a symmetrical manner with respect to 2 and has an opening at the top and bottom as a whole.

The four corners of the lower frame 13 are provided with steel frames 1.
Means are provided for adjusting the stationary level. Each of the nuts 18 is welded to the upper surface of a hole 17 formed at each of the four corners of the flange portion of the lower frame 13.
And each level adjusting bolt 19 screwed into the nut 18.

If the mesh panel 16 has a large mesh, the base concrete cast into the frame 11 will be described later.
If the mesh is small and the mesh is small, the concrete does not blow out around the mesh, so it is necessary to select a preferable mesh size. Further, when the thickness of the mesh panel 16 is small, the mesh panel 16 may be pressed by the concrete pressure.
Swells inward, and the space between the steel pole and the square iron pole is reduced, and the concrete injection described below is not performed well, and the strength is not obtained. Therefore, the thickness of the mesh panel 16 is desirably a thickness that can sufficiently withstand the concrete pressure and has such a strength that the rectangular stretched state can maintain the shape.

Then, the steel frame 11 is embedded and set on the discarded concrete 10, and a level measuring device (not shown) is mounted on the upper frame 12, and each level adjusting bolt 1 is mounted.
The adjustment of the level is made by the screw movement of No. 9.

When the steel frame 11 is buried and fixed in a predetermined state in this way, then, as shown in FIG. The base concrete 21 is poured into the space 20 (see FIG. 1) to the same level as the steel frame 11.

At the time of placing the foundation concrete 21, take care not to let the concrete 21 enter the steel frame 11, and also take care that the core of the steel frame 11 does not deviate from the column core. And place it.

When the basic concrete 21 is cast in this manner, concrete is blown out from the mesh of the four-sided mesh panel 16 of the steel frame 11 to form irregularities around the mesh, and the irregularities are injected into the mesh described later. Closely integrated with concrete.

After the base concrete 21 is hardened to a certain extent and the steel frame 11 is fixed, then, as shown in FIG. 6 and FIGS. The embedded portion of the square iron pillar 22 is aligned with the pillar core from above and the level is adjusted to be built.

The square iron pole 22 has a pull-out preventing member 25 such as a stud bolt or a thick reinforcing bar welded to the outer periphery of four sides of the embedded portion, and the upper frame 1 of the steel frame 11 is welded.
L-shaped receiving plate 23 having two holes 24 perforated at a height position substantially equal to the height up to 2 and on opposing outer surfaces.
Are welded respectively.

On the two-way receiving plate 23, two holes 24 are provided.
L-shaped level adjustment plate 2 having two holes 27 respectively adapted to
6 is bolted and fixed by bolts 31 and nuts 32 through matching holes with the respective holes 24 and 27.

The level adjusting means is the same as that of the steel frame 11, and as shown in FIG.
8 includes a nut 29 welded on the nut 8 and a level adjustment bolt 30 screwed into the nut 29.

The length of the level adjusting plate 26 is set to be slightly longer than the outer diameter of the upper frame 12 of the steel frame 11, and the level adjusting plate 26 is
Is supported by the flange portion of the upper frame body 12 and
2 are prevented from falling down, and the level adjusting bolts 30 are mounted on the upper surfaces of the four corners of the two-sided steel material of the upper frame body 12 in contact with the respective level adjustment bolts 30.

The inclination and height of the square iron pole 22 are adjusted via a level measuring device (not shown) and by the screw movement of each level adjusting bolt 30.

After the level of the square iron pole 22 is adjusted in this way, the bolt 31 and the nut 32 are removed, and
Each level adjusting plate 26 is removed from each receiving plate 23, and then, as a concrete pouring step, concrete 34 is formed in a space 33 between the steel frame 11 and the square iron pole 22, as schematically shown in FIG. (See FIG. 12) is injected.

Then, the concrete 34 is blown out from the mesh of the mesh panel 16 of the steel frame 11, is brought into close contact with the concrete surface which is unevenly set around the mesh, and is integrated with the concrete. In addition, the square iron pole 22 is completely embedded and fixed in the steel frame 11.

[0026]

According to the present invention, however, it is possible to cast a foundation concrete at once without using an expensive cast steel base plate as in the prior art. Construction of the steel frame was completed in the same construction period,
The construction period can be shortened, and the total cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a steel frame placing step in a method of embedding a steel building column according to the present invention.

FIG. 2 is a schematic front view showing an example of a steel frame.

FIG. 3 is a plan view of FIG. 2;

FIG. 4 is a bottom view of FIG. 2;

FIG. 5 is an enlarged front view of a partial cross section showing an example of the level adjusting means in FIG. 2;

FIG. 6 is a schematic view showing a concrete placing step and a steel pole embedding step in the embedding method of a steel building pillar according to the present invention.

FIG. 7 is a schematic view showing a concrete pouring step in a method of embedding a steel building column according to the present invention.

FIG. 8 is a schematic explanatory view in which a part of a steel pole building process is omitted.

FIG. 9 is a schematic plan view of FIG.

FIG. 10 is a partially enlarged sectional view showing a mounting state of a receiving plate and a level adjusting plate.

FIG. 11 is a partially enlarged cross-sectional view showing an example of a level adjusting means of an iron pole.

FIG. 12 is a schematic plan view of a partial cross section showing an embedded state of an iron column.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Discarded concrete 11 Steel frame 12 Upper frame 13 Lower frame 14 Column 15 Reinforcement stay 16 Mesh panel 17, 28 Hole 18, 29 Nut 19, 30 Level adjustment bolt 20, 33 Space 21, 34 Concrete 22 Iron column 23 Receiving plate 24, 27 hole 25 Pull-out preventing member 26 Level adjusting plate

Claims (1)

[Claims] 1. A steel frame which is open at the top and bottom and has expanded metal or other mesh panels stretched on the peripheral side surface, and is level-adjusted to a predetermined position on discarded concrete and is fixed. A stationary step; a concrete placing step in which foundation concrete is placed in an outer peripheral space of the steel frame; and after the foundation concrete has hardened to some extent, an embedded portion of an iron column is inserted into the steel frame from above with a pillar core. And a concrete injecting step in which concrete is injected into a space between the steel frame and the iron column, wherein the concrete is injected into the steel frame. A structure in which the iron pillar is completely embedded and fixed by being tightly integrated with the concrete surface of the uneven surface which is blown out from the mesh panel and hardened. Embedded method of steel construction columns and said.