JPS6042086Y2 - Anchor - Google Patents

Description

[Detailed Description of the Invention] Conventionally, U-shaped bolts have been embedded as anchors for arranging sound insulating walls and the like on concrete wall railings of bridges and viaducts.

This bolt construction method has the following drawbacks.

(1) It takes a lot of effort to set U-shaped bolts of about 20 mm while dodging the reinforcing bars arranged in a mesh pattern at intervals of about 10 to 20 cm on the wall railing.

(2) In the case of a U-shaped bolt, there is a regulation stating that the bending radius must be twice the diameter of the bolt.

Therefore, if the bolt is bent after securing the required straight buried length, the dimension from the tip of the bolt to the outer surface of the bent leg becomes large.

If a concrete cover of the required dimensions is applied to the outer surface of the leg, the thickness of the concrete product becomes large, which is not only uneconomical but also unsuitable for bridge wall parapets, etc., where weight reduction is desired.

(3) In order to prevent the concrete product from becoming thicker due to this bending radius, a method of welding horizontal rods that serve as legs to the anchor rods is also used.

In this method, since the material is generally bicarbon, welding is difficult, and the legs protrude laterally, making it very difficult to insert the bolts through the reinforcement gaps, similar to U-shaped bolts.

In addition, the diameter of the leg is required to be approximately equal to the outer diameter of the anchor rod minus the diameter of the mounting screw hole for strength reasons, so the leg tends to be thick, which is uneconomical and difficult to weld. becomes.

This invention consists of a pair of anchor rods that have a threaded hole for a temporary bolt on one end and a through hole in the direction perpendicular to the axis on the other end, and a connecting rod that is inserted into the through hole of each anchor rod. The anchor rod and connecting rod are separated to make installation and assembly easier regardless of the reinforcement arrangement, and the hairpin shape eliminates the need for thick concrete products. By applying shear stress to the surface,
It is made to be able to withstand even if the thickness of the connecting rod that becomes the leg is made thinner, and a specific example thereof will be described in detail with reference to the drawings as follows.

Reference numerals 1a and 1b designate a pair of anchor rods, the front end of which has screw holes 2a and 2b for mounting bolts for a member such as a sound insulating wall, and the rear end thereof having through holes 3a and 3b extending perpendicular to the axis.

4 is a connecting rod, which has through holes 3a and 3 in anchor rods 1a and 1b.
Anchor rod 1 having an outer diameter that approximately matches the inner diameter of b.
It has a length sufficient to pass through both feed holes 3a and 3b and connect both rods 1a and 1b when rods a and 1b are spaced apart.

This anchor is installed as follows.

Of course, the order is not limited to that described below.

First, the large diameter portion 12 of the temporary bolt 11 is screwed into the screw hole 2a of the anchor rod 1a.

Similarly, attach the large diameter part of another temporary bolt to anchor rod 1b.
screw into the screw hole 2b.

In this state, attach the small diameter part 13 of each temporary bolt to the formwork 1.
The anchor rods 1a and 1b are inserted into the attachment holes 15 of 4, screwed together with the nuts 16 on the small diameter portion 13 on the opposite side of the anchor rods, and tightened to attach the anchor rods 1a and 1b to the formwork 14.

Here, the connecting rod 4 is inserted into the through holes 3a and 3b of both the anchor rods 1a and 1b, and the whole becomes U-shaped.

If this situation places too much stress on the formwork attachment portion, the rear ends of each anchor rod 1a and 1b are supported by concrete reinforcing bars 17.

The anchor installation is now complete, and the only thing left to do is fill the space surrounded by the formwork with concrete.

Once the concrete has hardened, replace the nut 16 with the temporary bolt 11.
When the formwork 14 is removed from the small diameter portion 13 of the anchor rod 13 and the large diameter portion 12 is then removed from the anchor rod 1a or 1b, a screw hole 2a or 2b is provided for threading with a member attachment bolt.

According to the present invention, a pair of anchor rods and a connecting rod passing through both rods at their ends form a U-shape.
Not only does it have the benefits of a shaped bolt, but it is also extremely easy to pass between the reinforcing bars and attach it to the formwork, and if too much load is applied, the ends of both anchor rods can be supported by the reinforcing bars. As a result, the strength is sufficient, and since it is a hairpin type, the bending radius does not extend from the entire length of the anchor rod, which prevents the concrete product from becoming too thick, and can be used for bridge wall balustrades, etc. where it is difficult to maintain sufficient thickness. The pull-out force applied to the anchor rod is counteracted by the shear stress acting on the cross section on both sides where the connecting rod engages with the anchor rod, resulting in various effects such as the ability to make the connecting rod thinner.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a specific example of the anchor according to the present invention, and FIG. 2 is a cutaway perspective view of the same part. 1a, 1b... Anchor rod, 2a, 2b.
...Screw hole, 3att3b...Through hole, 4
・・・・・・Connecting rod.

Claims (1)

[Scope of utility model registration request] A pair of anchor rods having an axial temporary bolt screw hole at one end and a through hole perpendicular to the axis at the other end, and a connecting rod that is inserted into the through hole of each anchor rod. The anchor that becomes.