JPH0612048Y2 - Anchor bolt installation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an anchor bolt installation device used for an exposed fixing column base in a steel structure building.

[Conventional technology]

The accuracy of a steel structure building is greatly affected by the positional accuracy of the lowest floor pillar, and that pillar is greatly affected by the accuracy of the substructure. Since steel members manufactured in factories are generally delivered within the permissible error range, the error in the steel frame construction at the construction site often directly reflects the accuracy of the anchor bolts. Therefore, the quality of the steel frame construction depends on the accuracy of the anchor bolts.
Accurate positioning is required. Therefore, for example, the anchor bolt is held by a steel frame or holder as described on page 625 of Steel Frame Construction Technical Guide / Commentary (Published by the Architectural Institute of Japan on April 25, 1979).
It is common to use anchor bolt installation devices that prevent movement due to impact from concrete placement and pressure from the flow.

FIG. 6 is a front view of essential parts showing an example of a conventional anchor bolt installation device. In the figure, 1 is a frame,
For example, an equilateral angle steel is used to form a square frame shape, and an upper shape plate 2 is fixed to the upper part and a lower shape plate 3 is fixed to a position slightly higher than the lower end part. The anchor bolt 4 is configured to be retained in a retaining hole (not shown) provided. The positioning of the anchor bolt 4 in the vertical direction is performed, for example, by means of sandwiching the lower shaped plate 3 with a nut 6 via a square plate-shaped fixing plate 5. With the above-described structure, the frame 1 is placed at a predetermined position on the cast concrete 7 that has been placed in advance, the drill anchor 9 is driven and fixed, and then the foundation 8 as shown by the chain line is formed by concrete placing. To do.

[Problems to be solved by the invention]

The frame 1 constituting the above-mentioned conventional installation device is usually manufactured in advance in a factory and then transported to a construction site, but there are the following problems.

(1) Since the frame 1 is required to be steel to prevent deformation due to external force during transportation and during concrete placement, and to maintain its shape and size, it is usually larger than the diameter of the anchor bolt 4. Width sized components are used.
For example, an upright member made of equilateral angle steel shown in Fig. 6 is required, and the forest of these vertical members becomes an obstacle, and the frequency of interference with the horizontal reinforcing bars embedded in the basic concrete 8 is high, and the reinforcing bars are arranged. It is necessary to change the position or change the design of reinforced concrete beams in the ground.

(2) Since the frame 1 has many protruding parts, it is difficult to embed the anchor bolt 4 in the foundation 8 with high precision during the transportation from the factory to the site due to the mutual deformation and collision of the frames 1. Is.

(3) Since the frame 1 is generally assembled by welding, it is impossible to adjust the position of the anchor bolt 4 in the horizontal or vertical direction at the construction site.

A fixing member such as a drill anchor 9 is required to discard the frame 1 on the concrete 7, and a special tool and complicated work are required.

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems existing in the above-mentioned prior art and to provide an anchor bolt installation device capable of easily and highly accurately installing an anchor bolt.

[Means for solving problems]

In order to solve the above-mentioned problems, in the present invention, a pair of anchor frames having a plurality of upright supporting members and an upper end surface of which substantially forms a horizontal plane is provided on abandoned concrete, and a pair of holes for anchor bolts is provided. A holding member in which the upper shaped plate and the lower shaped plate are integrally joined by a hollow tubular connecting member that is provided concentrically with the anchor bolt hole and that closes the upper and lower ends of the connecting member. The tool is placed and fixed on the anchor frame, and an anchor bolt is provided so as to penetrate through the upper plate, the connecting member and the lower plate that form the holder, and the lower end of the anchor bolt is a nut. The technical means of fixing to the lower shaped plate and the fixing plate which is in close contact with the lower shaped plate via the above is adopted.

[Action]

With the above configuration, the anchor bolts can be embedded in the concrete foundation while being accurately positioned by the holder.

〔Example〕

1 and 2 are a front view and a partial sectional plan view of an essential part showing an embodiment of the present invention, respectively.
The same reference numerals as in the figure are used. In both figures, 10 is a connecting member, which is formed by a hollow pipe having a through hole, and is integrally fixed to the upper shaped plate 2 and the lower shaped plate 3 at both ends by, for example, welding to form a holder 11. . The inner diameter of the connecting member 10 is the anchor bolt 4
The nut 6 is formed to have a larger outer size than that of the nut 6 to be screwed into the upper shape plate 2 and is fixed to the lower shape plate 3 at a predetermined pitch. Next, the anchor bolt 4 is held through the insertion holes (not shown) formed in the upper shaped plate 2 and the lower shaped plate 3 at the pitches of the predetermined dimension. The means for positioning the anchor bolt 4 by sandwiching the lower shaped plate 3 with the fixing plate 5 and the nut 6 is the same as that shown in FIG. Next, a fixing member 12 made of equilateral angle steel, for example, is embedded in the discarded concrete 7 in advance, and an anchor frame 15 made of a supporting plate 13 and a supporting member 14 is placed and fixed. The supporting member 14 is composed of, for example, four hollow pipes similar to the connecting member 10, and the lower end portion thereof is supported by the supporting plate 13.
And the upper end surface are formed so as to form a substantially horizontal surface. With the above configuration, the holder 11 having the anchor bolt 4 inserted and held therein is attached to the anchor frame 15
The anchor bolt 4 can be embedded in the foundation 8 together with the holder 11 and the anchor frame 15 by placing it on top and fixing them by welding, for example, and then placing concrete.

The anchor bolt 4 embedded in the foundation 8 as described above does not contact the concrete forming the foundation 8 at least at the portion where the connecting member 10 surrounds the outer periphery. That is, since the concrete is poured in the upper and lower ends of the connecting member 10 in a state of being closed by the upper shaped plate 2 and the lower shaped plate 3, concrete does not enter the inside of the connecting member 10. Therefore, when the column base is installed and the nut 6a is tightened, the stress generated in the anchor bolt 4 is substantially equal in each part. For this reason, the initial tension applied to secure the fixedness of the column base does not decrease over time or due to the action of external force. On the outer periphery of the anchor bolt 4 embedded in the foundation 8 above the upper shaped plate 2, for example, a thin pipe (may be made of metal or non-metal) or a tape made of a flexible material or the like. By mounting and forming an unrestrained state with the foundation 8, the above action can be further increased.

FIGS. 3 and 4 are a front view and a plan view of a main part of another embodiment of the present invention, respectively, and the same portions are designated by the same reference numerals as those of the embodiments shown in FIGS. 1 and 2. Show. In both figures, four supporting members 14a made of, for example, equilateral angle steel are projected on the discarded concrete 7, and two horizontal supporting members 14b made of, for example, equilateral angle steel are provided at the upper end of the support member 14a. Are fixed via bolts 17 so as to form a substantially horizontal surface, and constitute the anchor frame 15. A long hole 16 extending in the vertical direction is bored in the support member 14a so that the bolt 17 can penetrate therethrough. With this configuration, the horizontal support member 1
4b can be moved up and down, and the leveling of the upper surface and the vertical position adjustment of the anchor bolt 4 shown in FIGS. 1 and 2 are possible.

Next, FIG. 5 is a plan view of an essential part showing still another embodiment of the present invention, in which the same parts are designated by the same reference numerals as those in FIGS. In the figure, elongated holes 18 and 19 are provided in the lower shaped plate 3 and the horizontal support member 14b so as to be orthogonal to each other so that the bolt 20 can pass therethrough. With this configuration, the lower shaped plate 3 can be moved in the horizontal plane, so that the position adjustment of the anchor bolt (not shown) inserted and held in the insertion hole 4a provided in the lower shaped plate 3 in the horizontal plane can be performed. It is possible.

In this embodiment, an example in which the holder is constructed by welding is shown, but it may be constructed by bolt-nut joining, or both may be used together. Further, the number of connecting members constituting the holder is not limited to four, and can be appropriately selected in consideration of the number of anchor bolts to be arranged and the like. Furthermore, the example in which the holding member and the component of the anchor frame are equilateral angle steel is shown, but the present invention is not limited to this, and other shaped steels, pipes, rods, and other structural members can be used. Of course, the combination of is also possible. In addition, as the support member projecting on the discarded concrete, a means for inserting the concrete at a predetermined position after the concrete is cast and before the concrete is not solidified may be adopted. Further, it goes without saying that the connecting member constituting the holder may be formed by a hollow pipe whose cross section is not circular.

[Effect of device]

Since the present invention has the structure and operation as described above,
The following effects can be expected.

(1) Since the anchor bolt is housed and held in the hollow tubular connecting member that constitutes the holder, the conventional frame does not obstruct the structure, the structure of the entire device is simplified, and the horizontal structure is placed in the concrete foundation. Almost no interference with the direction rebar.

(2) Since concrete is cast with the upper and lower ends of the connecting member closed, the concrete that constitutes the foundation does not contact the outer circumference of the anchor bolt in the connecting member at all. Therefore, after installation, the stress generated in the anchor bolts acts evenly on each part, and the initial tension does not decrease over time or due to external force and remains stable.

(3) Only the components that have been machined to the predetermined size in the factory can be manufactured and assembled at the construction site, so the transportation work becomes extremely easy.

(4) Bolts and nuts can be used to join all or part of the joining means between the constituent members, and the position of the anchor bolt can be adjusted at the construction site, greatly improving the positioning accuracy of the anchor bolt.

(5) Since the installation of the anchor frame is extremely easy,
The use of special tools or complicated work required in the prior art is completely eliminated, and the process can be greatly shortened.

[Brief description of drawings]

1 and 2 are a front view and a partial sectional plan view of an essential part showing an embodiment of the present invention, and FIGS. 3 and 4 are front views of an essential part showing another embodiment of the present invention, respectively. Same plan,
FIG. 5 is a plan view of a main part showing still another embodiment of the present invention, and FIG. 6 is a front view of the main part showing an example of a conventional anchor bolt installation device. 2: Upper shape plate, 3: Lower shape plate, 4: Anchor bolt, 1
0: connection member, 14, 14a: support member, 14b: horizontal support member.

Front page continued (72) Takashi Kitano, Takashi Kitano, 1-9-1, Kitahama, Wakamatsu-ku, Kitakyushu, Fukuoka Inside the Wakamatsu Factory, Hitachi Metals, Ltd. (72) Mitsunobu Iwata 4-1-1, Toyo, Koto-ku, Tokyo Hitachi Metals & Equipment Co., Ltd. (72) Noriaki Yamamoto Inventor Noriaki Nishi 4-chome, Chuo-ku, Sapporo-shi, Hokkaido, Hitachi Metals & Equipment Co., Ltd. Sapporo Sales Office (56) References: 57-12444 (JP, U) ) Actual development Sho 60-8305 (JP, U) Japanese Patent Sho 52-31085 (JP, B2)

Claims (6)

[Scope of utility model registration request] 1. A pair of upper shape plate and lower shape having an anchor frame having a plurality of upright supporting members and an upper end surface of which substantially forms a horizontal surface on abandoned concrete, and having an anchor bolt hole. A retainer is integrally formed on the anchor frame by a plate-shaped hollow tubular connecting member concentrically provided with the anchor bolt hole and integrally formed so as to close the upper and lower ends of the connecting member. An anchor bolt is mounted and fixed, and an anchor bolt is provided so as to penetrate through the upper shaped plate, the connecting member and the lower shaped plate which constitute the holder, and the lower end of the anchor bolt is attached to the lower shaped plate through a nut. An anchor bolt installation device characterized in that it is fixed to a fixing plate that is in close contact with the lower shaped plate. 2. The utility model registration claim 1 in which the support member is formed in a hollow tubular shape having an opening at the top, and the lower end of the anchor bolt and the nut are inserted into the support member through the opening. Anchor bolt installation device. 3. An anchor bolt installation device according to claim 1, wherein the support members are provided in a projecting manner on abandoned concrete, and a plurality of horizontal support members are fixed to their upper end portions. . 4. An anchor bolt installation device according to claim 3, wherein the anchor frame and the holder are joined by bolts and nuts. 5. An anchor bolt installation device according to any one of claims 1 to 3, wherein the anchor frame and the holder are welded and joined together. 6. An anchor bolt installation device according to any one of claims 1 to 5, wherein the upper profile plate and the lower profile plate and the connecting member are joined by welding.