C-type underbracing having enlarged end portions for installing on utility pole

Abstract

A C-type underbracing has developed for installing on a lower portion of a utility pole for firmly anchoring the utility pole. The underbracing is comprised of: a body (12) formed a half-annular or C-shape with a rectangular cross section; a pair of the enlarged end portions (11, 11′) having larger rectangular cross section than that of the body; a pair of the conjunction (17, 17′) for connecting between the body and the enlarged end portions; a hook receiving hole (13) horizontally through a center of the body, and a pair of nut mounting portions (16, 16′) formed flat surfaces for seating the nuts and a pair of slit-shaped holes (14, 14′) for horizontally inserting U-bolts (20) through the body portion, the nut mounting portions and slit-shaped holes disposed both sides of said hook receiving hole, and an earth plate (30) made of conductive material is attached to the bottom surface of the body.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a C-type underbracing installed at bottom end of the utility pole for anchoring. More particularly, the C-type underbracing formed enlarged end portions to facilitate installation on the utility pole by using a crane auger. The body segment between the enlarged end portions is formed C-shape with thinner than the body thickness. Thus, the enlarged end portions of the C-type underbracing will increase the contacting area with the covered soils to improve the resistance and enhance the supporting tension to the utility pole.[0003]2. Description of the Related Art[0004]For example, Korean Patent Application No. 2006-112100, filed by the applicant of the present invention, discloses a utility pole underbracing for utility pole construction. In this underbracing, as shown in FIG. 1, the overall shape of the underbracing 100 is roughly a half toroid. The inner semi-circle surface 101 conforms ...

AI Technical Summary

Benefits of technology

[0010]It is an object of the present invention to provide a C-type underbracing, for installation on a utility pole, wherein there are enlarged portions at both ends of the underbracing and the C-type body portion connecting the enlarged portions at both ends through inclined elements, is constructed smaller than the enlarged portions. The force of ground contact with the soil is improved through the enlarged portions. The utility pole underbracing is made lighter through the body portion being smaller than the enlarged portion. A hook inserting hole is through-formed in the center of the underbracing, so that it is easy to move and put in the utility pole underbracing using a crane. Bolt joining holes of slit shape are formed, separated at a given interval, making it easy to fasten a U bolt through the bolt joining hole.

[0011]In accordance with the present invention, there is provided a utility pole underbracing comprising friction-increasing means, which are: enlarged portions formed at both ends of a monolithically-formed utility pole underbracing; a C-type body portion with size and weight reduced; a binding guide means; and fastening means which are bolt joining holes for U bolts installed on the utility pole, formed at both sides of a hook receiving hole.

[0012]According to the C-type utility pole underbracing with enlarged portions, for construction of a burial hole for the present invention, the force of contact with the soil is improved by the enlarged portions. The utility pole is made lightweight through a reduced body portion. It is easy to move and install the utility pole underbracing with a crane, by using the hook receiving holes, and U bolts are fastened easily through the bolt joining holes, so there is convenience in construction.

Problems solved by technology

However, since the above mentioned semi-circular utility pole underbracing is a C-type solid bound by curved surfaces, the adherence area with soil is not sufficient, so the coherence between the pole and the soil is not satisfactory.

In the case of assembling with U bolts, the U-bolt insertion hole is of through-hole shape, so the dimensions of the insertion hole and the U bolt should match, which causes difficulty in logistics management, and frictional interference in construction.

Also, since the above mentioned conventional semi-circular utility pole underbracing is relatively large and heavy (95 kg), it is difficult to handle and there are many difficulties with fabrication and transportation.

When installing a large and heavy object in the utility pole burial pit by using an extra crane, the process for binding the underbracing to the crane is complicated, and it is also very difficult and toilsome to disconnect the bindings again.

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