JPH01163320A - Method and apparatus for fixing anchor bolt - Google Patents

Abstract

PURPOSE:To simplify field operations by a method in which the lower ends of anchor bolts fixed to a base concrete are fixed to a lower doubling plate with a fixing part which is fixed to the upside of PC plate of a given thickness. CONSTITUTION:The lower ends of anchor bolts 4 are connected with a lower doubling plate 3 with a fixing part 2 to make up an anchor frame A. The frame A is set through the fixing part 2 of the plate 3 on a precast concrete place 1 of a given thickness. Field operations can thus be simplified and the construction accuracy can also be raised.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for fixing an anchor bolt used for fixing a pillar base of a building, and an anchor bolt fixing device.

[Conventional technology]

There are three types of methods for fixing the column bases of buildings to the foundation structure: embedded type, root wrapping type, and exposed type that uses anchor bolts.The exposed type allows for a larger amount of space on the foundation floor, and is easier to construct. There are advantages such as good performance.

In the exposed type, anchor bolts are embedded in the concrete of the foundation structure such as foundation beams in advance, and the base plate at the lower end of the column base is connected and fixed to the anchor bolts to secure the column base. Japanese Patent Publication No. 61-1574 shows an example of such an exposed type column base fixing structure, and Japanese Utility Model Application Publication No. 60-8305 and Japanese Utility Model Application Publication No. 62-1540
Publication No. 44 and the like disclose a fixing structure for anchor bolts for fixing column bases.

The general construction method for conventional exposed column base fixed structures is to first perform soil work such as root cutting and laying gravel, then place concrete and mark it out, and then install anchor bolts on top of that. A fixed frame is fixed. The above-mentioned Jikai Showa 6
The ideas described in Publication No. 0-8305 and Publication of Utility Model Application No. 62-154044 are intended to improve workability and accuracy, and connect multiple anchor bolts with upper and lower attachment plates. The anchor bolt itself forms an anchor frame.

Anchor bolts are installed after reinforcing the foundation base and foundation beams, etc.
It is embedded in concrete, and in the case of the designs of Utility Model Application No. 60-8305 and Utility Model Application No. 62-154044, the upper attachment plate is removed and the base plate at the lower end of the column base is fixed using nuts or the like.

[Problem that the invention seeks to solve]

By the way, in the conventional anchor bolt fixing structure, markings are made on the disposable concrete cast on site, and a steel frame for supporting the anchor bolt or a fixing member for the anchor frame is fixed on top of the marking. It is necessary to discard a fixing bolt or hole-in anchor, etc. to fix it, and embed it in the concrete, or to drive an anchor. Therefore, the accuracy of embedding and the horizontal accuracy of the surface of the concrete become problems, which affect the installation accuracy of the anchor bolt itself and become a bottleneck in improving workability.

The anchor bolt fixing method and anchor bolt fixing device of the present invention are intended to solve the above-mentioned problems.

[Means for solving problems]

Hereinafter, an overview of the present invention will be explained using reference numerals in the drawings corresponding to the embodiments.

The anchor bolt fixing device of this invention has an anchor frame A fixed on a precast concrete board (hereinafter referred to as a PC board) of a required thickness, and the anchor frame A holds the lower ends of a plurality of anchor bolts 4. They are connected by a lower attachment plate 3 provided with a fixing member 2. Anchor bolts 4 forming anchor frame A are PCC
10 is held vertically by a lower attachment plate 3 fixed to the upper surface thereof, and is buried in the foundation concrete of the foundation base 12, foundation beam 13, etc.

In the anchor bolt fixing method of the present invention, the above-mentioned PCC 10 is installed at a predetermined position on the cut ground,
A lower attachment plate 3 provided with a fixing member 2 is fixed on a temporary PC 1, and a plurality of anchor bolts 4 are vertically arranged. The lower end of each anchor bolt 4 is connected to the lower end plate 3.
The anchor frame A is formed by connecting the upper ends of each anchor bolt 4 with the upper support plate 5. In this state, reinforcing the foundation base 12, foundation beams 13, etc. is arranged, a formwork is assembled, and concrete is poured, so that the anchor bolts 4 are embedded in the concrete. Thereafter, the upper support plate 5 is removed, and the base plate 16 of the column 15 erected on the foundation concrete is connected and fixed to the anchor bolt 4.

Note that the fixing member 2 described above may be integrated with the lower attachment plate 3 or may be separate.

〔Example〕

Next, the illustrated embodiment will be described.

FIG. 1 shows an embodiment of the anchor bolt fixing device of the present invention, in which a fixing member 2 on a PCC board in which hole-in anchors 8 etc. are embedded in advance is manufactured in a factory.
A lower support plate 3 equipped with a screwdriver is fixed, and the lower ends of a plurality of anchor bolts 4 having threaded ends are passed through the bolt insertion holes of the fixing member 2 and the lower support plate 3, and fixed with nuts 9 from above and below. ing. The upper end of each anchor bolt 4 is similarly passed through the bolt insertion hole of the upper attachment plate 5 and fixed from above and below with pads 10 to form an anchor frame A.

The fixing member 2 in this embodiment is made by crisscrossing channel steel and welding an m-plate approximately the same shape as the lower attachment plate 3 thereon.
It is fixed to the upper surface of the c-board 1, and a gap is formed between the upper surface of the PCC 10 and the lower support plate 3, so that the anchor bolt 4 can be fixed with the nut 9.

Figures 2 and 3 show details of the structure of the lower end of the anchor frame A in this invention;
The drawings and FIG. 5 show how the anchor bolt fixing method of the present invention is carried out.

The construction procedure is as follows: First, the roots are cut to a predetermined depth as ground work, mortar 6 is placed on top of the gravel, and the PC board 1 is installed horizontally on top of the mortar 6. A sacrificial concrete 7 is cast around the PC board 1 so that its top end coincides with the top surface of the PC board 1, and the PC board 1 is fixed.

Next, using hole-in anchor 8 or the like, fixing member 2
is fixed on the upper surface of the PC board 1, and the lower attachment plate 3 is placed on top of it.
Put on.

The lower end of each anchor bolt 4 is passed through the bolt insertion hole of the fixing member 2 and the lower attachment plate 3, and fixed with nuts 9 from above and below. to form anchor frame A.

Next, as the anchor frame A, pillow-shaped reinforcements 11 consisting of hoop reinforcements and upright reinforcements are placed over the anchor bolts 4 set in a predetermined position, and reinforcement is then placed on the bottom plate and foundation beams. Reinforcement arrangement 14 is performed (see Fig. 4).

After reinforcing, the formwork is assembled, and after pouring the concrete for the bottom plate 12, the concrete for the foundation beam 13 is poured. Become.

Note that it is advisable to protect the screw at the upper end of the anchor bolt 4 with vinyl tape or the like to prevent concrete from adhering to it.

After the concrete has hardened and the formwork has been removed, Nando 10
Loosen and remove the upper support plate 5.

Next, the pillar cores of the lifted steel columns 15 are aligned, and the upper ends of each anchor bolt 4 are passed through the bolt insertion holes of the base plate 16 of the column 15 and fixed with nuts 18 (see FIG. 5). In the figure, reference numeral 17 is similar to the injection washer disclosed in Japanese Patent Publication No. 61-1574, and grout can be injected through this injection washer 17 to increase the joint strength of the column base.

To give an example of the dimensions in the above embodiment, although it varies depending on the design, in the case of fixing the column base of a rectangular copper pipe column with a cross section of 300 mm on a side, a P with a thickness of 40 mm and a side of about 470 mm.
A C plate 1 is used, and the anchor bolt 4 is a deformed reinforcing bar with a diameter of about 30 mm with threads formed at both ends. Further, the number, arrangement, etc. of the anchor bolts 4 can be changed as appropriate.

〔Effect of the invention〕

■ In the method and device of the present invention, the lower attachment plate with the fixing member and the anchor frame are fixed to the PC board, so the on-site work is easier than in the case of fixing it on top of the conventional concrete poured on-site. This makes construction easier and allows for highly accurate construction.

■ PC boards can be produced in factories and have high dimensional accuracy.
In addition, high-strength materials are easily available, and fixing fittings for fixing the fixing member can be embedded accurately in advance, so a highly reliable structure can be constructed.

■ The fixing device of this invention is constructed using a minimum number of highly accurate members, such as an anchor frame that uses the anchor bolt itself and a PC board, so it is easy to handle and greatly improves workability. can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the attachment of an anchor frame in an embodiment of the present invention, FIG. 2 is a horizontal sectional view, FIG. 3 is a vertical sectional view, and FIG. 4 is a perspective view showing the attachment of pillow-shaped reinforcements. , FIG. 5 is a perspective view showing the fixed state of the column base. A... Anchor frame, 1... PC board, 2...
Fixing member, 3... Lower attachment plate, 4... Anchor bolt, 5... Upper attachment plate, 6... Mortar,
7... Discarded con, 8... Hole in anchor, 9.
...Nando, 10...Natsuto, 11...Pillow-shaped muscle, 1
2... Foundation bottom plate, 13... Foundation beam, 14... Foundation beam reinforcement, 15... Column, 16... Base plate, 1
7... Injection washer, 18... Nando patent applicant
Asahi Kasei Kogyo Co., Ltd. Kaya Figure 5＼ Figure 4

Claims (2)

[Claims] (1) An anchor bolt fixing method in which the upper and lower ends of a plurality of anchor bolts are each fixed to an upper support plate and a lower support plate provided with a fixing member to form an anchor frame, and the anchor bolts are fixed to the foundation bottom plate, as described above. A method for fixing an anchor bolt, comprising: laying a precast concrete plate of a required thickness at an anchor frame installation position, and installing the anchor frame on the precast concrete plate via a fixing member of a lower attachment plate. (2) The lower ends of the plurality of anchor bolts fixed in the foundation concrete are fixed to a lower attachment plate equipped with an anchoring member, and the anchoring member of the lower attachment plate is attached to a precast concrete plate of a required thickness. An anchor bolt fixing device, characterized in that it is fixed to.