JPH11286943A - Anchor frame of exposed pedestal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the constructing property by providing an anchor plate in a prescribed position in an anchor frame for fixing an anchor bolt onto leveling concrete. SOLUTION: An anchor frame is formed of a frame lower frame 2 fixed to the upper surface of a leveling concrete 1, a strut 3, and a fixing plate 6, and anchor bolts 7 are fixed to the anchor plate 6. The anchor plate 6 integrally has a mounting bracket 5 having a form closely fitted to the outer surface of the strut 3, and it is set in four corners of the anchor frame on the outside of the strut 3, and situated on the inside of the bolt 7 in a plan view. The strut 3 has an L-shaped section with a circular outer corner, and the bracket 5 has an L-shaped section with a circular inner corner whose curvature radius is smaller than the outer corner circular arc of the strut 3, and the fixing plate 6 is welded to the bracket 5 by cutting out one corner of the square in the plan view. The lower frame 2, the strut 3 and the bracket 5 are fastened by bolt and nut. According to this, since the anchor frame can be made compact, the bar arrangement is facilitated, and the excavation quantity of ground can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of an anchor frame for an unbonded anchor bolt type exposed column base, in which an anchor bolt is discarded before foundation concrete is poured and fixed on concrete.

[0002]

2. Description of the Related Art Conventionally, in an exposed column base of an unbonded type anchor bolt type, various anchor frames have been proposed and practiced in which an anchor frame is discarded and fixed on concrete before foundation concrete is poured. For example, the anchor frame described in Japanese Patent Application Laid-Open No. H08-144381 is designed such that the anchor bolts stand at the upper end of a pillar that is bolted to the four corners of the lower frame of the frame, more specifically, at a position inside the pillar. A horizontal fixing plate is installed. An anchor frame described in Japanese Patent Publication No. Hei 7-116714 discloses a frame lower frame fixed on an abandoned concrete with anchor bolts, and is vertically erected on the center of the frame lower frame to adjust the height in the vertical direction. A pillar having a hole, and can be moved up and down by fitting to the upper part of the pillar,
The support column has a center pipe fixed by pins, an anchor receiver fixed to the center pipe and radially arranged, and an anchor frame having a configuration in which an anchor bolt is passed through the pipe at the tip of the anchor receiver and fixed with a nut. It has been disclosed.

[0003]

The above-mentioned anchor frame has a structure in which the pillars are arranged so that the support pillars project outward more than the anchor bolts. Become an obstacle to work. Not only that, because the plane shape of the anchor frame is large as described above, the excavation range and excavation amount of the ground are expanded, and the dimensional restrictions are particularly large near the boundary of the site, May hinder construction.

[0004] The above-mentioned anchor frame does not have the above-mentioned problem because its planar shape is smaller than the arrangement of the anchor bolts. However, the stability of supporting the anchor bolts on the anchor frame structure itself is low, Also,
There is a problem that the number of steps for attaching the anchor bolt increases, and the workability is poor. Therefore, the object of the present invention is to
The pillars are arranged smaller inward than the anchor bolts, and have a compact configuration as a whole, and have high enough stability to support the anchor bolts. It is an object of the present invention to provide an exposed column base anchor frame in which the standardization of parts is achieved by the stop structure and the height is easily adjusted.

[0005]

According to a first aspect of the present invention, there is provided an anchor frame for an exposed column base according to the first aspect of the present invention. An anchor frame for discarding anchor bolts and fixing it on concrete before casting, comprising a frame lower frame, a support, and a fixing plate, wherein the fixing plate is a mounting metal fitting in close contact with the outer surface of the support. The fixing plate is provided integrally, and the fixing plate is provided at the four corners of the anchor frame at the outer portion of the column.

According to a second aspect of the present invention, in the anchor frame of the exposed type column base according to the first aspect, the column is formed of a member having an L-shaped cross section and an outer corner formed in an arc shape. That is, the mounting hardware of the fixing plate also has an L-shaped cross section, and its inner corner is formed of an arc-shaped member having a smaller radius of curvature than the arc of the outer corner of the support, and has a substantially planar shape. A corner of the rectangular fixing plate is cut out, and the mounting hardware is vertically joined.

According to a third aspect of the present invention, in the anchor frame of the exposed type column base according to the second aspect, the joint between the support and the frame lower frame and the joint between the support and the fixing hardware of the fixing plate are bolts and nuts. It is characterized in that it is a conclusion by. According to a fourth aspect of the present invention, in the anchor frame of the exposed column base according to the second aspect, the connection between the support and the mounting hardware of the fixing plate is performed by fastening with a bolt and a nut together with the upper reinforcing material. I do.

According to a fifth aspect of the present invention, there is provided an anchor frame for an exposed column base according to the second or third aspect, wherein a plurality of bolt holes are provided in a vertical direction at a lower portion of the column for bolt connection between the column and the frame lower frame. Or a long hole is provided. The invention described in claim 6 is claim 1 or 3 or
In the anchor frame of the exposed column base described in 5 , the frame lower frame is formed by using a member having an L-shaped cross section, and one side of the member is assembled in a rectangular shape in a horizontal outward direction. Bolt holes are provided at the four corners of the vertical side for bolting the columns, and bolt holes are provided near the column mounting parts on the horizontal side to connect with the concrete bolts. And The invention according to claim 7 is the invention according to claim 1 or 2.
Anchor plate of exposed column base
Is either above or below the midpoint of the height of the mounting hardware.
It is characterized by being installed at a height position biased to one side
And

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An anchor frame of an exposed column base according to the inventions according to the first to seventh aspects of the present invention is an anchor frame of an unbonded anchor bolt type which is provided with an anchor bolt before the foundation concrete 20 is cast. 7 is preferably disposed as an anchor frame for fixing the concrete on the concrete 1.

As shown in FIGS. 1 and 2, this anchor frame has a frame lower frame 2 fixed to the upper surface of a discarded concrete 1, and a lower end fixed to four corners of the frame lower frame 2. A vertical support 3 and a horizontal upper reinforcing member 4 for stiffening the upper end of each of the support 3
A fixing plate 6 is fixed to the outside of the upper end of each of the columns 3 by a mounting hardware 5, and an anchor bolt 7 is installed vertically through a bolt hole of the identification mounting plate 6.

Each fixing plate 6 is integrally provided with a mounting metal member 5 having a shape closely contacting the outer surface of the column 3, and the fixing plate 6 is located outside of the column 3 by the mounting metal member 5 and at four corners of the anchor frame. It is installed horizontally. That is,
Since the fixing plate 6 is installed such that each bolt hole is concentric with the plane arrangement designed for each anchor bolt 7, each column 3 is necessarily positioned inside the plane arrangement of each anchor bolt 7. Therefore, the anchor frame has a compact configuration.

As shown in FIG. 2, the pillars 3 at the four corners constituting the anchor frame of the exposed column base are formed by means such as roll forming of a flat steel plate (not hot rolling). It is formed of an L-shaped member having an L-shaped cross section and at least an outer corner formed in an arc shape (R shape). The mounting hardware 5 of the fixing plate 6 is also formed of an L-shaped member having an L-shaped cross section and an inner corner formed in an arc shape (R shape) having a smaller radius of curvature than the arc of the outer corner of the column 3. Have been. Then, one corner of the fixing plate 6 having a substantially square planar shape is cut out so as to have substantially the same shape as the planar shape of the mounting hardware 6, and the mounting hardware 5 is vertically applied to the cutout portion by means such as welding. They are integrally joined (the invention according to claim 2).

The joint between the column 3 and the frame lower frame 2 constituting the anchor frame of the exposed column base and the joint between the column 3 and the mounting hardware 5 of the fixing plate 6 are basically fastened with bolts and nuts. (The invention according to claim 3). As a premise, an L-shaped member 2 ′ also having an L-shaped cross section is provided on a frame lower frame 2 constituting an anchor frame of an exposed column base.
Is used. However, the L-shaped member 2 ′ does not require the arc-shaped (R-shaped) corners described above as an essential requirement, and may be a member that is hot-rolled. As is apparent from FIG.
The shape member 2 'is used with its side 2a facing outward in the horizontal direction, and is previously assembled in a factory or the like into a rectangular shape as shown in FIG. 3, and the respective contact portions are integrally formed by means such as welding. A rigid assembly is conveniently used. Each L-shaped member 2 ′ constituting the frame lower frame 2 has at least one bolt hole 8 for bolting the column 3 to the four corners of the vertical side 2 b.
Each of the horizontal sides 2a is provided with a bolt hole 10 at a position near the support column mounting portion for joining through the disposal concrete anchor 9 on the disposal concrete 1 side (the invention according to claim 6).

In short, the frame lower frame 2 which constitutes the anchor frame of the exposed column base is fixed on the surface of the discarded concrete 1 through the bolt hole 10 to the discarded anchor 9 prepared in advance when the discarded concrete 1 is constructed. Then, the nut 11 is tightened to be firmly fixed. Since the bolt hole 10 is provided in the vicinity of the column mounting portion, the fixing state of the frame lower frame 2 by the discarding anchor 9 most effectively resists the overturning moment and provides high stability (resistance). Demonstrate.

On the other hand, a plurality of bolt holes 12 (or elongated holes having a similar adjustable length) are provided in the vertical direction below the column 3 for bolt connection between the column 3 and the frame lower frame 2. After properly adjusting the height of the column 3 by selecting the plurality of bolt holes 12 (or by using a long hole), the bolt holes 8 in the frame lower frame 2 and the bolt holes 12 in the lower portion of the column are bolted. By fastening the nut 14 through the nut 13, the bolt connection of the column 3 utilizing the characteristics of the L-shaped member is performed firmly.

The column 3 erected vertically as described above.
First, it is assumed that the upper part of the column 3 and the mounting hardware 5 of the fixing plate 6 are in a common position (concentric arrangement), and that the upper and lower positions of the fixing plate 6 Is provided with a bolt hole 15. Also, the bolt hole 15 is formed at the end of the upper reinforcing member 4 using flat steel.
A bolt hole 16 whose center coincides with the center is provided, and when the fixing plate 6 is mounted on the upper portion of the column 3 via the mounting hardware 5, the bolt 17 and the nut 18 are firmly joined together with the upper reinforcing plate 4. Have been. As described above, the column 3 using the L-shaped member and the mounting hardware 5 of the fixing plate 6 are overlapped inside and outside and bolted, and as a result, the arc-shaped corners of the L-shaped members are tightly wound together so as to be in close contact with each other. Strong bonding can be achieved very effectively with the effect obtained.

Accordingly, the anchor frame of this exposed column base has a length of 600 to 1200 mm attached to each fixing plate 6.
Thus, the upper end of the anchor bolt 7 is stably supported with high accuracy within a range of ± 1 mm. Note that the above embodiment
Is a position approximately at the midpoint of the height of the mounting hardware 5 with the fixing plate 6 attached.
, But is not limited to this. Fixing plate 6
As means for more actively adjusting the height, FIG. 4 and FIG.
The embodiment shown is from the midpoint of the height dimension of the mounting hardware 5.
Is also deviated vertically (the upper and lower bolt holes 15, 15
At the position where the interval is divided into m and n (m> n)
The present invention is characterized by a digitized configuration (the invention according to claim 7). FIG.
Is used in such a manner that the fixing plate 6 is at a high position deviated upward.
An example is shown. Fig. 5 shows the usage pattern upside down.
On the contrary, in a mode in which the fixing plate 6 is at a low position deviated downward.
4 shows the embodiment used. Such an embodiment
When selected, simply use the mounting hardware 5 inverted upside down
The height of the fixing plate 6 can be changed in two steps
Come and be efficient. The anchor bolt 7 is mounted and fixed to the fixing plate 6 with two upper and lower nuts 21, with level adjustment. Foundation concrete 2
After the anchor bolts 7 are embedded by embedding 0 and cured, the base plate 23 of the steel column 22 is set to each anchor bolt 7 and firmly fixed with a nut 24. Reference numeral 25 in FIG. 1 is a preceding mortar, and 26 is a pouring grout.

[0018]

[Effects of the present invention] In the anchor frame of the exposed column base according to the present invention, since the planar arrangement of the columns is smaller inside the arrangement of the anchor bolts, the structure is compact as a whole. The degree of hindrance to the rebar arrangement work of the reinforcing bars arranged as reinforcement for the foundation concrete is low, and the work efficiency of the rebar arrangement can be increased. In addition, the excavation area of the ground can be narrowed by the size of the anchor frame which is compact and small, and the amount of excavated soil can be reduced, and the labor for earthworks can be saved. In addition, when the anchor bolt is arranged near the boundary of the site, the anchor frame does not protrude and become an obstacle, which is convenient in construction.

In addition, since the anchor bolt is provided with sufficiently high stability for vertical support, and the fixing plate is bolted to the column, standardization of parts is achieved. In addition, the height of the post can be adjusted when bolts are connected between the post and the lower frame of the frame, and the height and height of the fixing plate can be easily changed and adjusted by reversing the top and bottom of the mounting hardware. Adjustment of bolt height is convenient.

[Brief description of the drawings]

FIG. 1 is an elevational view showing a use state of an anchor frame of an exposed column base according to the present invention.

FIG. 2 is a perspective view of a main part showing a lower frame, a support, a fixing plate, and an upper reinforcing member.

FIG. 3 is a plan view of a lower frame of the frame.

FIG. 4 is an elevation showing different embodiments of the anchor frame .
FIG.

FIG. 5 is an elevational view of a usage mode in which the mounting hardware is turned upside down.
It is.

[Explanation of symbols]

 2 Frame lower frame 3 Prop 4 Upper reinforcement 6 Fixing plate 5 Mounting hardware 13 Bolt plate 8 Bolt hole 12 Bolt hole 15 Bolt hole 17 Bolt

Claims (7)

[Claims] 1. An anchor frame for removing an anchor bolt from an unbonded anchor bolt type exposed column base before placing foundation concrete and fixing the concrete on concrete, comprising a frame lower frame, a support, and a fixing plate. The fixing plate is integrally provided with a mounting hardware having a shape closely contacting the outer surface of the column, and the fixing plate is provided at an outer portion of the column and at four corners of the anchor frame. Anchor frame for legs. 2. The supporting column has an L-shaped cross section, and its outer corner is formed of a member having an arcuate shape. The mounting hardware of the fixing plate also has an L-shaped cross section, and the inner corner has the inner corner. It is constituted by a member formed in an arc shape having a radius of curvature smaller than the arc of the outer corner of the column, and the mounting metal is vertically joined by cutting out one corner of the fixing plate having a substantially square planar shape. The exposed frame base anchor frame according to claim 1, wherein: 3. An exposed column base according to claim 2, wherein the joint between the column and the lower frame of the frame and the joint between the column and the mounting hardware of the fixing plate are fastened with bolts and nuts. Anchor frame. 4. The joint between the support and the fixing hardware of the fixing plate is as follows.
The anchor frame according to claim 2, wherein the upper frame is fastened by bolts and nuts together with the upper reinforcement. 5. The exposure according to claim 2, wherein a plurality of bolt holes or long holes are provided in a vertical direction below a support for connecting a support to a lower frame of a frame by bolts. Anchor frame for column base. 6. The frame lower frame is formed by using a member having an L-shaped cross section, and is formed by assembling a quadrangular planar shape so that one side of the member is directed outward in the horizontal direction. bolt holes for bolt joint is provided, characterized in that the bolt holes for joining concrete side of the anchor bolt discarded in the vicinity of the column mounting portion of the horizontal edges is provided, according to claim 1 or 3, or 5. An anchor frame for an exposed column base described in 5 . 7. The fixing plate is located between the heights of the mounting hardware.
Mounted at one of the heights above or below the point
3. The method according to claim 1, wherein
Exposed column base anchor frame.