JP3762898B2 - Template removal device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is applied to an exposed fixed column base method in which a steel column base is fastened to a plurality of anchor bolts embedded in foundation concrete and projecting at the top end, and a template is temporarily fixed to the top end. In order to remove and attach the template that was temporarily fixed to the upper end after the anchor bolt is positioned and adjusted at a predetermined position aligned with the column base, and the lower end of the anchor bolt is embedded and fixed in the foundation concrete The present invention relates to a template detaching apparatus effective for use.
[0002]
[Prior art]
In the exposed fixed column base method, for example, as shown in FIG. 1, a steel column base 2 is erected on the basic concrete 1, and a plurality of pieces (for example, four) are embedded from the bottom of the basic concrete 1. The upper end screw portion 3a of the anchor bolt 3 is protruded, a flange-like base plate 4 is attached to the lower end of the column base portion 2, and the base plate 4 is fixed to the upper end screw portion 3a with an injection washer 6 and a double nut 7. is doing.
[0003]
A grout material 5 such as shrink mortar is interposed between the foundation concrete 1 and the base plate 4. The grout material 5 is placed on the foundation concrete 1 in advance with a grout material 5a for level adjustment, and the column base 2 The level is adjusted while the base plate 4 is leveled by tightening the nut 7 at the time of mounting, and after solidifying, a mold (not shown) is installed on the outer periphery, and grout material is replenished from the inlet 6a of the injection washer 6 The gap portion is filled through the mounting hole 4 a of the base plate 4.
In this exposed type fixed column base method, in order to build the column base part 2 in a predetermined position set in advance, it is necessary to align the upper end screw part 3a of the anchor bolt 3 protruding from the foundation concrete 1, and for that purpose. As a means, an anchor support device capable of positioning each anchor bolt 3 in the XYZ axial directions is erected on the foundation ground (not shown), and the upper end thread portion 3a of the anchor bolt 3 is used as a steel plate for positioning. As shown in FIG. 2, the template 8 is temporarily fixed by the holding nut 9.
[0005]
The template 8 adjusts the positioning of the anchor bolt 3 by the anchor support device, and then attaches reinforcing reinforcing bars to the outer periphery of the anchor bolt 3 and places the concrete foundation 1 in the formwork (not shown) by placing the concrete in the formwork (not shown). It is temporarily fixed until construction, and is removed from the anchor bolt 3 when the grout material 5a for level adjustment is placed and the column base 2 is installed.
[0006]
[Problems to be solved by the invention]
The template 8 in this exposed type fixed column base method has a horizontal interval (X direction and Y direction) between the upper end screw portions 3a, 3a of each anchor bolt 3 when each anchor bolt 3 is positioned and adjusted in the XYZ axial directions by the anchor support device. The mounting hole of the template 8 through which the upper end screw portion 3a is inserted is formed to have a diameter slightly larger than the outer diameter of the upper end screw portion 3a so that the (direction) does not fluctuate.
[0007]
As described above, the basic concrete 1 was constructed because the template 8 is fitted at four or more locations in a state where there is no allowance for the dimensional difference between the inner diameter of the mounting hole of the template 8 and the outer diameter of the upper end screw portion 3a. When removing later, for example, even when the upper end threaded portion 3a of each anchor bolt 3 is slightly displaced due to the inclination of the template 8 or the like, there is a possibility that the two are locked and cannot be detached. .
[0008]
In addition, if it is attempted to forcefully attach and detach, the screw thread of the upper end screw portion 3a is damaged, making it difficult to fix the column base portion 2 to the base plate 4, or the upper end screw portion 3a is bent so that the column base portion 2 is bent. There is a possibility that it cannot be installed at a predetermined position. If the vicinity of the attachment hole is cut and removed unavoidably, the template 8 cannot be reused repeatedly, which is uneconomical.
[0009]
Therefore, the present invention provides a template detaching apparatus in the exposed fixed column base method capable of solving these problems of the prior art, and without interfering with each other with respect to a plurality of anchor bolts. The main purpose is to easily remove the template from the upper end thread of the anchor bolt so that it can be reused repeatedly.
[0010]
[Means for Solving the Problems]
The template detaching apparatus according to the present invention includes a template through which an upper end thread portion of an anchor bolt is inserted, a desorption auxiliary plate that is mounted between the upper end thread portion and the template, and a template that is screwed into the upper end thread portion to move the template up and down. The attachment / detachment auxiliary plate is thinner than the template, and the outer diameter surface can be loosely fitted to the attachment hole of the template by frictional force. In addition to being formed to have an outer diameter, the inner diameter surface is formed to have an inner diameter size that can be loosely fitted to the outer diameter surface of the upper end threaded portion with a frictional force.
[0011]
In this template desorption apparatus, the desorption auxiliary plate can be slid in the vertical direction between the holding nuts until the desorption auxiliary plate is temporarily fixed to the upper end threaded portion of the anchor bolt and the foundation concrete is constructed. In addition, with respect to the horizontal direction, the displacement of the upper end threaded portion in the template mounting hole is constrained, so that the upper end threaded portion of each anchor bolt can be stably held in place.
[0012]
Also, when removing the template and installing the column base, if the upper holding screw is removed from the upper threaded part and the template is struck upward from the lower side, Since the template is tilted by impact and vibration and the inner diameter surface of each mounting hole is separated from the attachment / detachment auxiliary plate without interfering with the tip screw portion, the attachment / detachment can be easily performed.
[0013]
Therefore, the removed template and the attachment / detachment auxiliary plate can be reused repeatedly, which is very economical and does not cause the upper end thread portion to be damaged or curved when the template is removed. The building work of the part can be easily and accurately performed. .
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a template desorbing device according to the present invention will be described in detail with reference to FIGS. 3 to 5 showing a preferred embodiment. FIG. 3 shows a front view of a main part in an assembled state of the desorbing device. FIG. 5 shows an enlarged schematic view of the desorption device, and FIG. 5 shows a front view of the main part in the desorption state of the desorption device.
[0015]
As shown in FIG. 3, the detaching device 10 includes a template 13 into which the upper end screw portion 12 of the anchor bolt 11 is inserted, a detachment auxiliary plate 14 that is attached between the upper end screw portion 12 and the template 13, and an upper end screw. The holding nuts 15 and 16 are screwed into the portion 12 to hold the template 13 from above and below.
[0016]
The template 13 has a rectangular plate shape as in the case of the prior art and is provided with four or more mounting holes through which the upper end screw portion 12 is inserted. The inner diameter of the mounting hole 13a is the same as in the case of the prior art. Unlike the outer diameter dimension of the upper end screw portion 12, the inner diameter dimension is set to be loosely fitted with a sufficient dimensional difference.
[0017]
As shown in FIG. 4, the attachment / detachment auxiliary plate 14 is thinner than the template 13, and the outer diameter surface 14 a is gently fitted to the mounting hole 13 a of the template 13 by a frictional force. The inner diameter surface 14b is formed to have an inner diameter dimension D2 that can be loosely fitted to the outer diameter surface of the upper threaded portion 12 with a frictional force. .
[0018]
In the illustrated embodiment, the attachment / detachment auxiliary plate 14 is formed in a ring shape (annular shape) in which the inner and outer diameter surfaces 14b and 14a are both circular, but the outer diameter surface 14a is not necessarily circular, Any shape that fits into the mounting hole 13 may be used, and the outer diameter surface 14a and each mounting hole 13 may be formed in a polygonal shape including a rectangular shape or an elliptical shape, for example.
[0019]
Therefore, when the upper end screw portion 12 of the anchor bolt 11 is inserted into the template 13 and the attachment / detachment auxiliary plate 14 and fixed with screws by the holding nuts 15 and 16 screwed to the upper end screw portion 12, the template 13 is held from above and below. However, the attachment / detachment auxiliary plate 14 is in a state of being separated from the holding nuts 15 and 16 and is slidable in the vertical direction, and the upper end screw portion 12 is located in the mounting hole 13a of the template 13 in the horizontal direction. Temporarily fixed in a state of restraining displacement.
[0020]
Next, when removing the template 13 from the upper end screw portion 12, as shown in FIG. 5A, after removing the upper holding nut 15, the hammer 13 or the like is used to remove the template 13 from the lower surface side of the template 13. When hitting upward (arrow), the template 13 can be easily detached from the outer peripheral surface of the attachment / detachment auxiliary plate 14 by the impact and vibration as shown in FIG.
[0021]
That is, in the case of the prior art, since the tip threaded portion 3a of each anchor bolt 3 is inserted into each mounting hole of the template 8, when the template 8 is tilted when being detached, the inner peripheral surface of each mounting hole is screwed. While the insertion / removal auxiliary plate 14 is inserted into the groove, the attachment / detachment auxiliary plate 14 is interposed. Therefore, when the template 13 is tilted by impact and vibration, the attachment hole is removed from the attachment / detachment auxiliary plate 14 without interfering with the tip screw portion 12. Since the inner diameter surface 13a of 13 is pulled apart, it can be easily detached.
[0022]
Thereafter, the attachment / detachment auxiliary plate 14 and the lower holding nut 16 are removed from the upper end screw portion 12, and the column base is built on the foundation concrete via the upper end screw portion 12 in the same manner as in the prior art. However, the removed template 13 and the attachment / detachment auxiliary plate 14 can be reused repeatedly, and there is no fear of damaging or curving the upper end screw portion 12 when removing the template 13.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a front view partially showing a cross section of a main part of a building foundation by an exposed fixed column base method to which a template desorption apparatus of the present invention is applied.
FIG. 2 is a front view partially showing a cross section of a main part of a conventional template detaching apparatus.
FIG. 3 is a front view of a template detaching apparatus according to an embodiment to which the present invention is applied, showing a part of an essential part in an assembled state.
4 is an enlarged schematic view of a part of the template detaching apparatus according to FIG. 3;
FIG. 5 is a front view showing a part of the main part in the detaching state of the template detaching apparatus according to FIG. 3;
DESCRIPTION OF SYMBOLS 1 Basic concrete 2 Column base part 3,11 Anchor bolt 3a, 12 Upper end screw part 4 Base plate 4a 13a Mounting hole 5 Grout material 6 Injection washer 6a Inlet 7 Double nut 8,13 Template 9,15,16 Nipping nut 10 Desorption Device 14 Desorption auxiliary plate 14a Outer diameter surface 14b (of the desorption auxiliary plate) Inner diameter surface D1 (of the desorption auxiliary plate) Outer diameter size D2 Inner diameter size

Claims (1)

Consists of a template through which the upper end threaded portion of the anchor bolt is inserted, a desorption auxiliary plate that is mounted between the upper end threaded portion and the template, and a clamping nut that is screwed into the upper end threaded portion to sandwich the template from above and below. The desorption auxiliary plate is formed to have an outer diameter dimension that can be loosely fitted to the extent that the outer diameter surface is locked with a frictional force with respect to the mounting hole of the template, with the plate thickness being thinner than the template. The inner diameter surface is formed with an inner diameter dimension that can be loosely fitted to the outer diameter surface of the upper threaded portion by frictional force, and the attachment / detachment auxiliary plate is separated from the upper and lower holding nuts. It is mounted in the template mounting hole so as to be slidable in the vertical direction, and is temporarily fixed in the horizontal direction while restraining displacement of the upper end screw portion in the template mounting hole. Features Desorption unit of the template.

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