JP3009039U - Adjustment nut for anchor bolt fixing device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an adjustment nut for anchor bolt fixing device that removes the gap between a tubular member made of standard steel pipe and an anchor bolt made of screw rebar to enable accurate positioning of the anchor bolt. To do. [Structure] The adjusting nut (30) has a female screw (31) that is screwed into a screw of a screw rebar on the inside, and a polygonal tool engaging surface on the outside.
It is composed of a body portion (33) having (32) and a cylindrical portion (34) axially protruding from one end surface of the body portion. The cylindrical portion (34) has an inner diameter slightly larger than the outer diameter of the threaded bar that meshes with the female screw (31) and an outer diameter slightly smaller than the inner diameter of the tubular member.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is an anchor bolt fixing for adjusting and arranging an anchor bolt, which is fixed to a steel-framed reinforced concrete structure or a steel-framed building and has a relatively large diameter, to a predetermined height and position before placing concrete concrete. A device comprising a vertical tubular member, a threaded rebar to be inserted into the tubular member, and an adjusting nut screwed onto the threaded rebar protruding from above and below the tubular member. Relates to an anchor bolt fixing device adapted to adjust the height of a tubular member, and in particular to an adjusting nut for this anchor bolt fixing device.

[0002]

[Prior art]

 Generally, the anchor bolt fixing device adjusts the height of the anchor bolt to a predetermined height before placing the concrete. When adjusting the height of the anchor bolt, an anchor bolt made of screw rebar is inserted into the tubular member of the anchor bolt holding means, and nuts are screwed onto the anchor bolts protruding from above and below the tubular member. Turn to adjust the height of the anchor bolt. As the anchor bolt, a commercially available standard diameter one is used, and as the tubular member into which the anchor bolt is inserted, the inner diameter close to the outer diameter of the screw rebar used in the carbon steel pipe for piping specified by JIS standard is used. Those that have are selected and used. However, if the diameter of the anchor bolt, that is, the diameter of the threaded bar becomes larger like the nominal diameters D35, D41, D51, the gap between the threaded bar and the carbon steel pipe for piping becomes 3 mm on one side, and the tightening Since the shaft center of the anchor bolt moves during this process, it was difficult to position the anchor bolt accurately even after mounting the positioning jig or template on the top of the anchor bolt and then tightening the nut.

[0003]

[Problems to be solved by the device]

 An object of the present invention is to provide an adjustment nut for an anchor bolt fixing device that eliminates a gap between a tubular member made of a standard steel pipe and an anchor bolt made of a screw rebar to enable an accurate positioning of an anchor bolt. is there.

[0004]

[Means for Solving the Problems]

 In order to solve the above-mentioned object, an adjusting nut for an anchor bolt fixing device according to the present invention comprises an adjusting nut having an internal thread to be engaged with a thread of a screw rebar and an external polygonal tool engaging surface. And a cylindrical part that projects axially from one end surface of this main body part.The cylindrical part is slightly larger than the outer diameter of the threaded bar that meshes with the internal thread and slightly larger than the inner diameter of the tubular member. It is characterized by having a small outer diameter.

[0005]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. FIG. 1 shows an overall view of an anchor bolt fixing device having an adjusting nut according to the present invention.

This anchor bolt fixing device is applied with an anchor bolt composed of a screw rebar having a particularly large diameter, such as nominal diameters D35, D41, and D51, and is applied to a concrete 2 upright from a base 2 fixed on abandoned concrete 1. It has a tubular member 3. A central strut 4 made of screw rebar is inserted into the central tubular member 3 and the height thereof is adjusted by a adjusting nut 30 according to the present invention, which will be described later, and then the central strut is prevented from turning by a set screw 6. It is tightened and fixed to. For example, if D41 is used for the screw reinforcement of the central support column 4, a nominal diameter of 50 A of commercially available carbon steel pipe for piping is suitable for the central tubular member 3, but since the inner diameter is 52.3 mm, A gap of about 3.05 mm is formed on one side between the outer diameter of the rebar D41 and 46.2 mm. In order to eliminate this gap, the adjusting nut 30 according to the present invention, as shown in FIG. The main body portion 33 has a main body portion 33 and a cylindrical portion 34 axially protruding from one end surface of the main body portion 33. The cylindrical portion 34 has an inner diameter slightly larger than the outer diameter of the screw rebar 4 that meshes with the female screw 31, and an outer diameter slightly smaller than the inner diameter of the tubular member 3. When such a cylindrical portion 34 is inserted into the annular gap between the inner peripheral surface of the tubular member 3 and the outer peripheral surface of the threaded reinforcing bar 4 as shown in FIG. The adjustment nut 30 can be easily rotated in a stable state by engaging with the tool engagement surface 32 of 33.

An anchor bolt holding means 10 for holding four anchor bolts 15 made of screw rebar having a nominal diameter D41 is attached to the central support column 4. As shown in FIGS. 5 and 6, the anchor bolt holding means 10 includes a central tubular member 11 to be inserted into the central column 4 and four radially extending radially outwards from the outer peripheral surface of the central tubular member 11. The arm 12 and the tubular member for anchor bolt 13 fixed to the end of each arm 12 are provided. The central tubular member 11 of the anchor bolt holding means 10 is inserted into the central support column 4 and the upper and lower parts are tightened and fixed by the adjusting nuts 30, 30 according to the present invention. The anchor bolt tubular member 13 is inserted with an anchor bolt 15 which is a screw rebar having a nominal diameter D41, and is fixed by tightening the upper and lower parts by an adjusting nut 30 according to the present invention.

In this case, since the central support column 4 and the anchor bolt 15 use the D41 screw rebar having the same nominal diameter and the tubular members 3, 11 and 13 use the carbon steel pipe 50A for piping having the same nominal diameter, The same adjusting nut 30 can be used. The adjusting nut 30 can be made of iron or plastic.

A positioning jig or template 20 is attached to the top ends of the four anchor bolts 15 by nuts 21 above and below for positioning the anchor bolts.

To briefly explain the construction method using the above anchor bolt fixing device, the central support column 4 is inserted into the tubular member 3 of the base 2 mounted on the discard concrete 1, and the height is adjusted by the adjusting nut 30. Then, tighten the screw 6 to stop the rotation. Next, the anchor bolt holding means 10 is attached to the central support column 4, the height is adjusted by the upper and lower adjusting nuts 14 of the central tubular member 11, and then tightened and fixed, and further each screw 17 (FIGS. 5 and 6) is attached. Tighten it as a detent. Further, an anchor bolt 15 which is a screw rebar having a predetermined size, for example, a nominal diameter D41, is inserted into each anchor bolt tubular member 13, the height is adjusted by the upper and lower adjusting nuts 30, and then fixed by tightening. Next, a ten plate 20, which is an anchor bolt positioning jig, is inserted from the top ends of the four anchor bolts 15, and the heights thereof are adjusted by the nuts 21 and 21 above and below, and then fixed by tightening.

Then, the foundation concrete 7 is poured into a form (not shown), and after the foundation concrete 7 is solidified, the mortar is placed in the range of the foundation concrete 7 surrounded by the four anchor bolts 15. It is poured and the upper surface is flattened to obtain level mortar 8. When the level mortar 8 is solidified, the base plate 9 to which the pillar material is attached is placed in advance, and the nut is screwed into the top end portion of the anchor bolt 15 to fix the base plate 9.

[0012]

[Effect of device]

 As described above, the adjusting nut of the present invention has the female thread that is screwed into the thread of the threaded reinforcing bar on the inner side, and the polygonal tool engaging surface on the outer side. It has a cylindrical portion that has a diameter of slightly larger than the outer diameter of the threaded bar that meshes with the internal thread and an outer diameter that is slightly smaller than the inner diameter of the tubular member. Can be removed by inserting the cylindrical portion into the relatively large gap that occurs between the tubular member and the tubular member into which the threaded reinforcing bar is inserted when using as an anchor bolt or a center column. Accurate positioning of the car bolt is possible.

[Brief description of drawings]

FIG. 1 is an overall view of an anchor bolt fixing device assembled using an adjusting nut according to the present invention.

FIG. 2 is a cross-sectional view of an adjusting nut according to the present invention.

FIG. 3 is a plan view of the adjustment nut of FIG.

FIG. 4 is a cross-sectional view showing a relationship between a tubular member, a screw rebar inserted therein, and an adjusting nut meshing with the screw rebar.

FIG. 5 is a plan view of an anchor bolt holding means.

6 is a side view of the anchor bolt holding means of FIG. 5. FIG.

[Explanation of symbols]

 3,11,13 Tubular member 4,15 Screw rebar 7 Basic concrete 15 Anchor bolt 30 Adjusting nut 31 Female screw 32 Tool engaging surface 33 Body part 34 Cylindrical part

Claims (1)

[Scope of utility model registration request] 1. An anchor bolt for adjusting and arranging an anchor bolt made of a screw rebar having a relatively large diameter, which is fixed to a steel-framed reinforced concrete structure or a steel-framed building, at a predetermined height and position before placing concrete foundation. A fixing device comprising a vertical tubular member, a threaded rebar inserted into the tubular member, and an adjusting nut screwed into the threaded rebar protruding from above and below the tubular member, and these nuts are turned to rotate the threaded rebar or the tubular member. In an anchor bolt fixing device adapted to adjust the height of a member, said adjusting nut has a body portion having an internal thread for internally screwing with a thread of a threaded reinforcing bar and an external polygonal tool engaging surface. And a cylindrical portion axially protruding from one end surface of the main body portion,
The adjustment nut for an anchor bolt fixing device, wherein the cylindrical portion has an inner diameter slightly larger than the outer diameter of the screw rebar meshing with the female screw and an outer diameter slightly smaller than the inner diameter of the tubular member.