JPS5821013A - Method of burying insert clamping tool - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] This invention utilizes insert bolts used for joining ALC (autoclaved lightweight concrete) panels, GRC (glass fiber reinforced cement) panels, etc. by tightening inserts such as insert bolts and insert screws. ALC and G of ingredients
Regarding embedding method in RC panel.

Conventionally, the method of embedding this type of insert fastener is to
A pilot hole is drilled in the LC or GRC panel using a drilling machine, and a bolt or nut is driven into the pilot hole to attach and fix the panel. This makes the installation work cumbersome and has poor workability, and is not effective in preventing removal. It has drawbacks such as being cloudy.

The purpose of this invention is to simplify the installation work and improve workability, and to provide a method for embedding an insert fastener that can be expected to be effective in preventing thick holes. shall be.

An embodiment of the present invention will be described below with reference to the drawings.

Figure 1 shows the insert fastener (A) used in this invention.
FIG. 1(a) shows an example in which an insert nut is used as the insert fastener, and in the same figure, (1) is a box nut, and (2) is a fastening member.
is a spacer, (3) is a fixing bolt, and (4) is an expandable connecting member. The tightening member (1) and the spacer (2) are arranged facing each other on the same axis. Fixing bolt (
The tip C) of 3) is screwed into the screw hole (la) of the tightening member (1).

The expandable connecting member (4) (see Fig. 1C) is a cylindrical member with a plurality of cuts (gaps) (5) formed in the axial direction at predetermined intervals in the circumferential direction, and (1) and the spacer (2), and are arranged at the periphery of the opposing surfaces of the spacer (1) and the spacer (2).
The clamping member (1) and the spacer (2) are connected by joining the clamping member (1) and the spacer (2) to the opposite surfaces of the clamping member (1) and the spacer (2) by suitable means such as welding, and the central part ( 4C) is formed to have a somewhat thin wall shape and bulge in the radially outward direction to provide expandability in the radially outward direction.

On the other hand, when an insert bolt is used as the insert fastener (A), it is constructed as shown in FIG. 1(b).

In the figure, (1) shows a tightening member which is an insert bolt, (2) shows a spacer, (4) shows an expandable connecting member, and a through hole C! is drilled in the center of the spacer (2). → Insert the leg part α of the tightening member (1) and tighten one end of the expandable connecting member (4) (four on the opposite surface of the spacer (2), the other end 61) It is joined to the opposing surface of the head (10) of the member (1) to connect the tightening member (1) and the spacer (2).

The insert fastener (A) having the above configuration is tightened from the surface of the panel to the point where it is necessary to bury the concrete panel (6) such as ALC or GRC in a flexible state before hardening, that is, in a semi-hardened state. Insert the spacer (
2) is left above the panel and embedded (see FIGS. 2(a) and 3(a)).

FIGS. 2(a) and 2(b) are explanatory views when the tightening member (1) is an insert nut, and FIGS. 3(a) and (b) are explanatory views when the tightening member (1) is an insert bolt.

Figures 2 (a) and 3 (as shown in Figure 3), insert fasteners (A) are semi-buried in the concrete panel (6) and allowed to harden to determine the degree of hardening of the concrete panel (6). Advance the tightening member (1) to the concrete panel (
6), then tighten the fixing bolt (3) and tightening member (1).
) while fixing the legs CtW of the panel (
8), press and fix the panel from above and pull up the clamping member (1) in the direction of arrow C to bring the clamping member (1) close to the spacer (2). ('b)
The insert state is as shown in .

Along with this proximal axis movement, the cylindrical expandable connecting member (
A pull-out stopper burr (7) is formed inside the concrete-based panel (6) by expanding the central portion α of 4) in the radial outward direction.

Note that even if the expandable connecting member (4) has a configuration in which both the upper and lower ends 14aD, Ql)t) are continuous in the circumferential direction as shown in FIG. 1(C), The same effect as in 1)) is obtained where both ends α~ and Yu are not continuous in the circumferential direction.

As described above, the method for embedding an insert fastener according to the present invention involves embedding a fastener connected with an expandable connecting member from the fastener to the spacer when the concrete panel is semi-hardened,
Once the concrete panel has hardened, pull up the clamping member while fixing the spacer with a holding member so that the clamping member and spacer are close to each other, and when they approach, expand the expandable connecting member to prevent them from coming out. Since this is a method of burying the insert fasteners that make up the reusable part, the installation work is easier than the conventional method of installing insert fasteners.

In addition to improving workability, the burr for preventing removal is formed which expands greatly in the radial direction, making it possible to attach insert fasteners with excellent removal prevention effects to concrete panels. play.

[Brief explanation of the drawing]

FIGS. 1(a) and 1(b) are external views of the insert fastener used in the method of the present invention, and FIG. 1-(C) is another embodiment of the expandable connecting member constituting the insert fastener. 2(a), (b) and 3(a), (1
)) is an explanatory diagram of this invention method. (1)...Tightening member (2)...Spacer (4
)...Expandable connecting member (6)...Concrete panel (7)...Barb to prevent removal (8)...
・Press member (C) 4C (a) (a) gl

Claims (1)

[Claims] (1) Cuts with a predetermined interval in the circumferential direction from the panel surface where insert fasteners are required to be buried when the concrete panel is semi-cured, to the opposing surfaces of the fastening member and spacer, which face each other on the same axis. The insert fasteners connected by expandable connecting members formed in the axial direction are buried, and after the concrete panel is further hardened in this buried state, it is pressed and fixed using a holding member from above the spacer and tightened. An insert fastener characterized in that the member is pulled up to be close to the spacer, and when the member is pulled up, the expandable connecting member is expanded radially outward to form a burr for preventing removal. Burial method.