JP2898786B2 - Fixing method of column base on steel column base of building - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for fixing a steel column base of a building to a concrete foundation, and fills a gap between the steel column base and the concrete foundation with grout to fix the steel column base. It is about the method.

[0002]

2. Description of the Related Art FIGS. 7, 8 and 9 show a conventional fixing method in a column base fixing method to which the present invention is applied. Conventionally, as a method of fixing a steel column base of a building to concrete,
As shown in FIG. 7, the upper part of the anchor bolt 10 whose lower part is embedded in the foundation concrete 17 is inserted into the bolt hole 16 of the base plate 2 and the washer 4 below the column base 1, and the nut 11 is screwed into the anchor bolt 10, Thereafter, the grout 3 is simultaneously filled into the gap between the upper surface of the foundation concrete 17 and the lower surface of the base plate 2, the gap between the bolt hole 16 of the base plate 2 and the anchor bolt 10, and the gap between the washer 4 and the anchor bolt 10, and integrally fixed. A method of fixing a pedestal is known. (JP 60
This fixing method is based on the bolt insertion hole 1
6, a groove 18 is formed on the back surface side, and a washer 4 (see FIGS. 8 and 9) in which a grout injection hole 5 opening in the groove 18 is formed. In order to be able to fill from any of the washers 4, the injection hole 5 is also used, and the injection hole 5 has the same diameter, and the grout 3 is filled by pressing the grout 3 from the injection hole 5 of one washer 4. The internal filling state is confirmed by blowing out grout 3 from another injection hole 5.

[0003]

In the above fixing method, when the number of anchor bolts, that is, the number of washers is eight or less, and the base plate is small, the blow-out from the injection holes other than the injection hole for filling is performed. The time difference is small, and the loss of the blown out grout until it is completely filled is small.

[0004] However, when the number of anchor bolts and washers is 10 or more, or when the base plate is large, grout blows out from the injection hole near the injection hole for grout filling by the time grout filling is completed.
Not only does the grout loss increase, but also the blowout of the grout from the injection hole near the injection port is more prominent than the planar spread of the grout, and sometimes does not lead to the blowout from the injection hole at a long distance.

In order to avoid such a state, the grouting has to be pressed with a finger or the like in order from the injection hole where the grout has started to blow out, so that the workability is reduced. An object of the present invention is to solve such a problem.

[0006]

According to the above-mentioned method for fixing a steel column base of a building to a concrete foundation,
Before grouting, all of the injection holes other than the injection hole used for injection, or at least the injection hole near the injection hole used for injection , have a through hole in the plug or central part.
The grout is inserted into the grouting hole, and then grout is filled from the grouting hole, thereby making it possible to prevent the overflow of the grout from the grouting hole and to excel. Things.

In the present invention, when air is not sufficiently vented and grout is difficult to fill, for example, the gap between the nut inner surface and the bolt outer surface, between the nut lower surface and the washer upper surface, and between the nut lower surface and the base plate upper surface. It is preferable to provide an air bleeding function, for example, by providing an air bleed hole between the holes or the washer.

[0008]

Next, the present invention will be described with reference to the illustrated embodiment.

[0009]

First Embodiment FIGS. 1 and 2 show a method of fixing a column base according to a first embodiment. A level mortar 21 is installed at a required position on the upper surface of the foundation concrete 17 as a height adjusting material,
The base plate 2 is placed thereon, and the anchor bolts 10 with the lower part buried in the foundation concrete 17.
Through the base plate 2 under the column base 1 and the bolt hole 16 of the washer 4, and insert the nut 1 into the anchor bolt 10.
1 is screwed and tightened, and a dam plate 19 installed on the upper surface of the foundation concrete 17 is provided around the base plate.
Prior to filling the grout, the filling hole 5 of the washer 4 other than the washer 4 used for filling the grout 3 is provided at the upper opening and the center.
As cylindrical body 6 having a through hole, transmural the central portion shown in FIG. 6
Note polyethylene foam rod having a through hole 9 is the upper surface of the round bar
It is inserted so as to be held at a position higher than the upper surface of the peripheral edge of the inlet hole 5, and thereafter, the gap between the upper surface of the foundation concrete 17 and the lower surface of the base plate 2, the bolt hole 16 of the base plate 2, the anchor bolt 10, And the gap between the washer 4 and the anchor bolt 10 are simultaneously filled with grout 3 and integrally fixed.

[0010] The outer diameter of the expanded polyethylene round bar is
Is slightly larger than the diameter of the through hole, and the diameter of the through hole is such that the through hole 9 in the central portion is not closed when the diameter is reduced and fitted into the injection hole 5. As shown in FIG. 1, the center of the cylindrical body 6
The diameter of the through hole is smaller than the diameter of the injection hole 5, and
The upper surface of the cylindrical body is higher than the peripheral upper surface of the injection hole 5 of the washer 4.
To maintain the air bleed function.
Thus, the overflow of grout can be prevented . In addition to the above-mentioned foamed polyethylene molded body, a foamed polystyrene molded body or another resin molded body can be used as the cylindrical body 6 having a through-hole at the center part to be fitted in the injection hole 5. Also, cylindrical body
If deflation is insufficient 6 besides the through hole 9 of a circle
It is necessary that the lower surface of the cylinder 6 be sufficiently raised above the upper surface of the base plate 2 to be positioned. On the other hand, the cylindrical body 7 which has in addition the through-hole 9 which penetrates vertically at the central position, the horizontal direction of the through hole 9 that is continuous with the through hole 9 of the upper and lower bottom plug (see FIG. 6)
In this case, it is also possible to make contact with the lower surface of the base plate 2.

Further, the grout 3 is injected instead of the above-mentioned washer injection hole 5, and the injection hole 2 provided in the base plate 2 is provided.
0 or press-fitting from an injection hole 20 provided in the weir plate 19. In this case, the injection holes 5 of all the washers 4,
Alternatively, a cylindrical body is fitted into the injection hole 5 of the washer 4 near the injection hole 20.

[0012]

Second Embodiment FIGS. 3, 4 and 5 show a method of fixing a column base in a second embodiment. A level mortar 21 is installed as a height adjusting material at a required position on the upper surface of the foundation concrete 17, and the base plate 2 is installed thereon,
In the base concrete 17, the upper part of the screw type reinforcing bar 13 having no thread 15 in the rib part 14 buried as the anchor bolt in the lower part as an anchor bolt is inserted into the base plate 2 under the column base 1 and the bolt hole 16 of the washer 4, A nut 11 is screwed into the screw-type reinforcing bar 13 and tightened, and a dam plate 19 installed on the upper surface of the foundation concrete 17 is provided around the base plate.
Before filling the grout 3, the plug 8 shown in FIG. 6 is fitted into the top opening of the injection hole 5 of the washer 4 other than the washer 4 used for filling the grout 3. ,
Thereafter, the gap between the upper surface of the foundation concrete 17 and the lower surface of the base plate 2, the gap between the bolt hole 16 of the base plate 2 and the screw type reinforcing bar 13, and the washer 4 and the screw type reinforcing bar 13
And the grout 3 is simultaneously filled into the gap between them and fixed integrally.

As shown in FIGS. 4 and 5, the rib portion 14 of the screw-type reinforcing bar 13 has no thread 15 serving as a thread, and the screw-type reinforcing bar 13 and the bolt hole 16 of the washer 4, and the screw-type reinforcing bar 13 and the base plate 2 When the nut 11 is screwed into the screw-type reinforcing bar 13, air flows in the length direction of the screw-type reinforcing bar 13 between the rib portion 14 of the screw-type reinforcing bar 13 and the inner surface of the nut 11 because there is a gap in the bolt hole 16 of the screw-type reinforcing bar 13. A hole 12 is formed, and a vent hole is formed from the lower portion of the base plate 2 to the upper surface of the nut 11. Since this vent hole serves as an escape route for air in the lower space of the base plate 2, air can be sufficiently vented even if there is no vent hole in the plug 8 inserted into the injection hole 5 of the washer 4.

[0014]

Advantages of the Invention According to the method of fixing a column base by grout filling of the present invention, a plug or a center fitting into an injection hole is used.
Since the cylindrical body having a through hole in the part prevents the overflow of grout with high fluidity, the grout overflows from the injection holes other than the injection hole used for grout injection on the column base with many bolts and washers. Partial excellence can be prevented. This prevents overflow out excellence from the injection holes to grouting completion, you are possible to minimize the loss of grout. 2. According to the method of fixing a column base by grout filling according to the present invention, a plug or a through hole is provided in a central portion before grout filling.
Since the cylindrical body to be inserted is inserted into the injection hole, it is not necessary to press the injection hole with a finger or the like at any time during grout filling according to the grout blowout from each injection hole serving as the grout outlet, thereby improving workability. 3. Placed column base fixing method according grouting of the present invention
When a cylindrical body with a through hole in the center is used,
By oozing grout into the through hole in the center of the cylinder ,
It can be confirmed that the internal filling has been completed.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a first embodiment of the present invention.

FIG. 2 is a plan view of a column base used in the first embodiment of the present invention.

FIG. 3 is a sectional view illustrating a second embodiment of the present invention.

FIG. 4 is a plan view of an anchor bolt and nut threaded portion according to a second embodiment of the present invention.

FIG. 5 is an elevation view of an anchor bolt and a nut screwing portion according to the second embodiment of the present invention.

FIG. 6 is a perspective view illustrating a plug used in the present invention.

FIG. 7 is a sectional view for explaining a conventional method of fixing a column base by grout filling.

FIG. 8 is a perspective view illustrating a front side of a washer.

FIG. 9 is a perspective view illustrating the back side of the washer.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Pillar base 2 Base plate 3 Grout 4 Washer 5 Injection hole 6, 7 Cylindrical body 8 Plug body 9 Through hole 10 Anchor bolt 11 Nut 12 Air bleed part 13 Screw type rebar 14 Rib part 15 Nose 16 Bolt hole 17 Foundation concrete 18 Concave groove 19 dam board 20 injection hole 21 level mortar

Claims (1)

(57) [Claims] 1. An upper portion of an anchor bolt having a lower portion embedded in a foundation concrete is inserted into a bolt hole of a base plate and a washer at a lower portion of a column base, and a nut is screwed into the anchor bolt to be installed. In the column base fixing method of filling the grout into the gap with the column and fixing the column base integrally, in the grout injection hole provided in advance, an opening of the injection hole near the grout injection hole used for injection is plugged. A method of fixing a column base in a steel column base of a building, characterized in that a cylindrical body having a through hole in a body or a center portion is fitted before grout filling, and thereafter grout is filled.