JPH02210118A - Embedding fixture for anchor bolt - Google Patents

Abstract

PURPOSE:To improve the reliability of the drawing out strength of inserts by fitting a nut previously on a bottom member to be jointed through a drum member and a flange, and by fitting a cover member to be the fixture of an anchor bolt. CONSTITUTION:A drum member 1 is provided with a flange 3 having a salient strip 4 at one end, and in the recessed groove 12 of a bottom member 11, the salient strip 4 is fitted, and in a recessed section 14, a nut 34 is fitted. After that, a cover member 25 is fitted on the drum member 1 to be enclosed, and the member 25, the bottom member 11, and the drum member 1 are combined with each other to form the fixture of an anchor bolt. Then, the fixture is embedded in concrete, and the cover member 25 is removed, and after that, the anchor bolt is spirally fitted on the nut through a drum section 2. Besides, the drum member 1 is selected according to the length of the bolt, and the drum and bottom members may be made of synthetic resin. As a result, at a proper position, the anchor bolt great in tensile strength and excellent in corrosion resistance can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an embedding fixture for embedding and fixing anchor bolts in concrete for fixing structural members, machines, etc. to concrete surfaces.

(Prior art) One method of retaining anchor bolts in concrete, which are embedded in concrete and used to fix structural members, machinery, etc., to the concrete surface is to install nut-shaped inserts in concrete and insert the anchor bolts into the concrete. It is widely known that screwing
No. 3, No. 35-10902, No. 48-19822,
(Refer to Utility Model Publication No. 37-2114). These inserts are installed into the concrete by inserting them into mounting holes formed at predetermined locations in the concrete, or by placing the inserts at predetermined locations and pouring concrete, and are then pulled out by anchor bolts that are threaded into the female threads of the concrete. It gives strength.

However, the conventional inserts are generally placed with their end faces exposed on the concrete surface,
Furthermore, even if the material is deeply inserted into the mounting hole, the pull-out strength is only generated by the meshing force and frictional force between the outer surface of the material and the concrete, so it is not reliable enough. Additionally, anchor bolts are susceptible to corrosion if the insert is deeply embedded in the concrete.
Another problem is that it is difficult to install the insert at an appropriate depth depending on the location of use.

(Problems to be Solved by the Invention) The present invention solves the above-mentioned technical problem that conventional inserts have poor reliability in terms of pull-out strength, and also eliminates concerns about anchor bolts being corroded and the difference in concrete depth. This is also intended to solve the aforementioned technical problem of being difficult to penetrate.

(Means for Solving the Problems) The present invention provides a cylindrical member having a flange extending outwardly at one end of a cylindrical body through which an anchor bolt is passed, a first cylindrical portion into which the outer periphery of the flange is fitted and coupled; The first means for solving the above technical problem is that the bottom member has a second cylindrical part into which a nut into which the anchor bolt is screwed is fitted in a non-rotatable manner. .

In addition to the first means, the present invention provides a first means for solving the technical problem by including a lid member attached to the cylinder at the end opposite to the flange of the cylinder member. I used the second method.

In the above two means, it is preferable that the cylindrical member and the bottom member be made of synthetic resin, and that a plurality of types of cylindrical members having different lengths are prepared depending on the length of the bolt.

(Function) By fitting a nut into the second cylindrical portion and fitting and coupling the flange into the first cylindrical portion, the bottom member and the cylindrical member are coupled, and the nut is incorporated.

Next, the open end surface of the cylindrical member is exposed to the concrete surface and embedded in the concrete II, an anchor bolt is inserted and screwed into a nut, and a structural member, a machine, etc. is fixed to this anchor bolt. When a pullout force is applied to the anchor bolt, the nut hits the flange and the concrete presses the flange, giving the anchor bolt a large pullout strength.

(Example) The present invention will be described in detail with reference to the drawings in Section 1.2.
An embedded fixture is constituted by the cylinder member 1, the bottom member 11, and two types of lid members 21 and 25 shown in FIG.

The cylindrical member 1 has a flange 3 integrally molded on one end of a cylindrical body 2 with both ends open and expanding outward at a right angle to the central axis thereof, and a protrusion 4 is provided on the circular outer periphery of the flange 3 over the entire circumference. The flange 3 has a protruding pin protrusion 5 parallel to the central axis. Moreover, this cylindrical member 1
Prepare multiple types with different quality depending on the length of the anchor bolt.

The bottom member 11 includes a short cylindrical first cylindrical portion 13 having an annular groove 12 on its inner peripheral surface into which the protrusion 4 is fitted and engaged, and a second cylindrical portion 15 having a regular hexagonal recess 14 at the end surface. A third cylindrical part 17 having a circular insertion hole 16 on the end face is integrally molded concentrically with the third cylindrical part 17 in order, and three leg pieces 18 surrounding the third cylindrical part 17 and protruding downward from its bottom surface are equally spaced in the circumferential direction. This is the configuration set up.

The lid member 21 includes a pillar portion 22 that is tightly fitted into the cylinder body 2 at the end opposite to the flange 3 of the cylinder member 1, a disc-shaped lid plate portion 23 having a diameter equal to the outer diameter of the cylinder body 2, and a lid plate. It has a structure consisting of a thin rod-shaped flexible knob piece 24 protruding from the center of the part 23. The other lid member 25 includes a pillar portion 26 that is tightly fitted into the cylinder body 2, a disc-shaped lid plate portion 27 having a diameter approximately equal to the outer diameter of the cylinder body 2, a screw rod portion 28, and a nut. The configuration consists of 29.

The cylindrical member 1, the bottom member 11, and one lid member 21 are made of synthetic resin, and the other lid member 25 is made of metal.

FIG. 4 shows a state in which the embedded fixture according to the configuration of the above embodiment is embedded in concrete 31, holds anchor bolts 32, and fixes a structural member 33. That is, the cylindrical member 1 and the bottom member 11 are combined with the protrusion 4 engaged with the groove 12 and the flange 3 closing the open end of the first cylindrical portion 13, so that the end surface of the cylindrical body 2 is placed on the concrete surface. It is embedded in the concrete 31 and exposed on the same surface as 31a.

Then, the anchor bolt 32 is screwed into a hexagonal nut 34 that is non-rotatably fitted into the second fishing part 15 of the bottom member 11.
This anchor bolt 32 penetrates the cylindrical member 1 and is attached to the structural member 3 by a washer 36 and a retainer nut 31 attached to the protruding end.
3 is fixed to a concrete surface 31a.

When a pulling force is applied to the anchor bolt 35, the nut 34
hits the flange 3 across the washer 35 fitted into the first cylindrical part 13, but since the concrete 31 is in contact with the opposite side of the flange 3, this provides pull-out strength to the anchor bolt 32, and the cylindrical member 1 is separated from the bottom member 11 and pulled out together with the anchor bolt 32, or the problem that the entire anchor bolt 32 is pulled out does not occur.

Here, the supporting strength when the embedded fixture is under tension is the outer peripheral surface of the cylinder member 1, the bottom member 11 and the concrete 31.
In addition to the adhesion fracture strength, the cone fracture strength shown by the broken line 38 in FIG.

Next, a method of embedding and fixing the embedding fixture according to the configuration of the above embodiment in concrete 31 will be explained.

FIG. 5.6 shows the case where the cover member 25 is placed along the vertical surface of the concrete 31, and the lid member 25 is installed in the mounting hole 40 of the weir frame 39.
The screw rod part 28 is inserted and the nut 29 is screwed, and the cover plate part 21 is pressed against the weir frame 39 and fixed. Next, washer 35,
The cylindrical member 1 is connected to the bottom member 11 in which the nut 34 is fitted into the first cylindrical part 13 and the second cylindrical part 15, and the cylindrical member 1 is attached to the column part 2B.
It is attached to the weir frame 39 at right angles by fitting the open end surface of the. Then, when the concrete 31 is poured and hardened, the nuts 29 are removed, the additional frame 39 is removed, and the lid member 2 is removed.
5 is removed and anchor bolts are inserted to support structural members and the like.

FIG. 7.8 shows a case in which the washer 35 and the nut 34 are placed along the horizontal surface of the concrete 31.
, the cylindrical member 1 is coupled to the bottom member 11 fitted into the second cylindrical part 15, and the column part 22 of the lid member 21 is fitted into the open end surface of the cylindrical body 2, and the leg piece 18 is attached to the floor surface 40. Place it upright. Then, the reinforcing reinforcement 41 and the bottle protrusion 5 of the flange 3 are tightly connected with the wire 42 to prevent it from falling down, and the concrete 31 is poured so as to be flush with the open end surface of the cylindrical member 1. The lid member 21 is removed and an anchor bolt is inserted to secure the machine or the like.

In this case, the lid member 21 prevents concrete from flowing into the cylindrical member 1, but if the lid member 21 is colored so that it can be easily distinguished from the concrete 31, the lid member 21 prevents the concrete from flowing into the cylinder member 1.
The work of removing the anchor bolt and inserting the anchor bolt can be done without overlooking.

In addition, when attaching to the extension frame 39, it is also possible to connect an anchor bolt in advance and attach it to the extension frame 39 using this anchor bolt. Therefore, the present invention can be carried out even if the lid members 21 and 25 are omitted, and the bottle protrusion 5 and the leg piece 1 can be omitted.
The object of the present invention can be achieved even without 8.

(Effects of the Invention) The present invention is composed of a bottom member in which a nut for screwing an anchor bolt is fitted in such a way that it cannot rotate, and a cylindrical member that encloses the anchor bolt. The concrete in contact with the flange receives the force from the nut during tension, giving it great pull-out strength. In addition, by appropriately selecting the length of the cylindrical member depending on the location of use, the anchor bolt is screwed into the nut at a point embedded deep enough in the concrete and in the appropriate position, and the pull-out strength can be set to an extremely high safe value. Furthermore, when the cylindrical member and bottom member are made of synthetic resin, there is no need to worry about corrosion because the anchor bolts do not come into contact with concrete.
This provides high reliability in terms of pull-out strength and durability.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway exploded front view showing an embodiment of the present invention, Fig. 2 is a plan view of the cylindrical member, Fig. 3 is a plan view of the bottom member,
Figure 4 is a longitudinal sectional view showing the state of use, Figures 5 and 6 are process explanatory diagrams of an example of embedding and fixing in concrete, and Figures 7 and 8 are process explanatory diagrams of cutting down and embedding and fixing in concrete. It is. 1... Cylinder member, 2... Cylinder body, 3... Flange, 1
DESCRIPTION OF SYMBOLS 1... Bottom member, 13... First cylindrical part, 15... Second cylindrical part, 21.25... Lid member, 34... Nut,

Claims (4)

[Claims] (1) Rotating a cylindrical member having an outwardly expanding flange at one end of the cylindrical body through which the anchor bolt passes, a first cylindrical portion into which the outer periphery of the flange is fitted and coupled, and a nut into which the anchor bolt is screwed. An anchor bolt embedding fixture, comprising: a bottom member having a second cylindrical portion that is tightly fitted into the bottom member. (2) An anchor bolt embedding fixture characterized in that, in addition to the structure of claim (1), a lid member is attached to the cylindrical body at an end opposite to the flange of the cylindrical member. (3) The anchor bolt embedding fixture according to claim (1) or (2), wherein the cylindrical member and the bottom member are made of synthetic resin. (4) The anchor bolt embedding fixture according to claim (1) or (2), wherein the cylindrical member has a plurality of types having different lengths depending on the length of the anchor bolt.