SU115400A1 - Device for gripping rebar during tension - Google Patents

Description

In the manufacture of reinforced concrete products, reinforced with prestressed rod and wire (string) reinforcement, the productivity and quality of reinforcement are determined by the method of connecting the tensioned reinforcement with jacks and form or stand supports. The clamps used for these codes should be small in size and weight to facilitate and shorten the installation time.

Various types of clamps are known: for one group of clamps, the connection of rod fittings to jacks is made by means of thread. In another group of clamps, the fixture of the armature is produced by wedges or cones. Such clamps have, as a rule, a tapered bore, in which a conical plug or several wedges are placed. However, with a large angle at the wedge (cone), the reinforcement is not always securely held between the wedges, and at a small angle, they are clamped in the clamp hole.

The proposed device eliminates the indicated disadvantages.

The drawing shows the described clip.

The clamp consists of body 1, shank 2, three clamping jaws 3, pusher 4, spring 5 and washer 6.

The body / clamps is a closed cylindrical ring that senses spacer and longitudinal forces during tensioning the reinforcement. Three inclined holes 7 and intersect are drilled in it, with one central cylindrical hole with them (not shown). In the inclined holes 7, the clamping jaws 5 are held together, and the reinforcement to be tensioned is passed into the central hole. The clamping jaws 3 can move along the inclined holes of the housing /, as along the guide channels, moving closer or apart. When approaching the jaws 3, the armature is clamped between three warped surfaces that are equally spaced around the area.

No. 115400-2 -

The clamping sponge 3 is a cylinder with cut flat (segment) at an angle to the longitudinal axis, which gives the sponge a wedge-shaped section. Along the shear plane, there is a clamping surface S having a toothed profile for engagement with the reinforcement to be tensioned.

The clamping shank 2 serves as an abutment for the spring 5 and has a guide hole for the pusher 4. The shank is also designed to be connected to the jack. The push rod 4 is designed to control the clamping jaws ..

Spring 5 serves to automate the clamp. It constantly strives to move the jaws forward for an approach and causes the jaws to jam between the housing / and the reinforcement located in the clamp. The expandable rod fittings are securely held by clamping jaws. To connect the clip with the rod to be tensioned, the sponge is pushed back by means of the pusher 4 and the clip is put on the end of the rod.

The release of the clamp after work is carried out by moving the body forward towards the clamping jaws, which removes the last of the wedging state.

The clamps can be used separately or assembled in cassettes for tensioning reinforcement packages, such as wire, straight, rod, etc.

Subject invention

Claims (3)

1. A device for gripping an armature when it is tensioned during the manufacture of tension-reinforced concrete products, consisting of a kerpus with three cylindrical jaws and a spring inserted into it, characterized in that, in order to reliably clamp the armature and correct distribution of stresses at the point of contact between the jaws and the body, the latter has inclined cylindrical channels, and to ensure the correct positioning of the jaws B of the hull channels and to control the joint movement of their jaws eh 2. The form of the device according to claim 1, characterized in that, in order to grip the reinforcement with the clamping surfaces of the jaws, the central opening intersects with the inclined channels, forming a single cavity in which the jaws can converge or diverge during the forward movement and cannot shift toward the axis of the housing (toward the central hole), due to the sufficient angle of coverage of each jaw with the surface of its channel. 3. The form of the device according to paragraphs. 1 and 2, characterized in that, in order to better capture the reinforcement, the sponges are made with segments under the tooth of the clamping surface removed at an angle to their axis.