Abstract

A tensioner for tensioning foundation bolts generally used in securing large utility towers is provided. The tensioner generally comprises a hollow outer body through which the foundation bolt can extend. The lower end of the body, which is adapted to abut onto the foundation surface from which the bolt extends, is provided with an opening allowing access to a foundation nut threaded onto the foundation bolt. The upper end of the outer body slidingly receives therein an inner body with which it defines an annular hydraulic piston, the inner body being configured with a seat portion for receiving and engaging a split nut mounted to the foundation bolt. Upon providing hydraulic fluid to the tensioner, the hydraulic piston urges the split nut, engaged to the foundation bolt, upwardly, thereby tensioning the foundation bolt. The load in the bolt is then maintained by threading down the foundation nut until it abuts onto the foundation surface.

IPC Classes  ?

• F16B 31/00 - Screwed connections specially modified in view of tensile loadBreak-bolts
• F16B 31/04 - Screwed connections specially modified in view of tensile loadBreak-bolts for maintaining constant tensile load
• F15B 1/00 - Installations or systems with accumulatorsSupply reservoir or sump assemblies
• F99Z 99/00 - Subject matter not otherwise provided for in this section

Abstract

A tensioner for tensioning foundation bolts generally used in securing large utility towers is provided. The tensioner generally comprises a hollow outer body through which the foundation bolt can extend. The lower end of the body, which is adapted to abut onto the foundation surface from which the bolt extends, is provided with an opening allowing access to a foundation nut threaded onto the foundation bolt. The upper end of the outer body slidingly receives an inner body with which it defines an annular hydraulic piston, the inner body being configured with a seat portion for receiving and engaging a split nut mounted to the foundation bolt. Upon providing hydraulic fluid to the tensioner, the hydraulic piston urges the split nut, engaged to the foundation bolt, upwardly, thereby tensioning the foundation bolt. The load in the bolt is then maintained by threading down the foundation nut until it abuts onto the foundation surface.

IPC Classes  ?

• B23P 19/06 - Screw or nut setting or loosening machines
• B25B 29/02 - Bolt tensioners
• F16B 37/10 - Quickly-detachable nuts, e.g. consisting of two or more partsNuts movable along the bolt after tilting the nut divided parallel or about parallel to the bolt axis

Abstract

A unibody hydraulic nut for tensioning multiple threaded fasteners includes an unibody containing two or more pistons to generate a clamping load, castellated locking collars with angled vertical castellations to engage a socket with matching castellations to enable easy turning by remotely operated means to capture the clamping load, internal hydraulic ports contained within the unibody linking each piston, seals to maintain the hydraulic pressure within the multiple annular pressure areas and an external hydraulic pressure port extending through the hydraulic nut unibody to the first pressure area and adapted to be connected to an external pressure source

IPC Classes  ?

• F16B 31/04 - Screwed connections specially modified in view of tensile loadBreak-bolts for maintaining constant tensile load
• F16B 37/08 - Quickly-detachable nuts, e.g. consisting of two or more partsNuts movable along the bolt after tilting the nut

Abstract

A hydraulic union assembly for joining pipes includes an outer body that threads the female hub, an inner body or piston that generates an axial force under hydraulic pressure, a hydraulic port and seals to maintain the hydraulic pressure within the annular pressure area that operates in an elastic region and continues to actuate hydraulic pressure after repeated operating cycles, and preferably a mechanical threaded locking collar to retain axial force after release of hydraulic pressure.

IPC Classes  ?

• F16J 15/14 - Sealings between relatively-stationary surfaces by means of granular or plastic material, or fluid
• F16L 17/02 - Joints with packing adapted to sealing by fluid pressure with sealing rings arranged between outer surface of pipe and inner surface of sleeve or socket
• F16L 19/04 - Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on, or into, one of the joint parts using additional rigid rings, sealing directly on at least one pipe end, which is flared either before or during the making of the connection

Abstract

A hydraulic nut for tensioning an assembly includes a mechanical threaded locking collar to minimize load loss during transfer of hydraulic load to the locking collar, a 'S' or 'Z' shaped annual piston to minimize height of the hydraulic nut, an annular pressure area to generate an axial load under hydraulic pressure, a hydraulic pressure port and metallic seals to maintain the hydraulic pressure within the annular pressure area that operates in an elastic region and continues to actuate hydraulic pressure after repeated operating temperature cycles. Also disclosed are hydraulic nuts having a 'U' or 'C' shape seal made of a thin rigid material, hydraulic nuts using stub acme threads and a method of using such nuts.

IPC Classes  ?

• F16B 31/00 - Screwed connections specially modified in view of tensile loadBreak-bolts
• F16B 31/04 - Screwed connections specially modified in view of tensile loadBreak-bolts for maintaining constant tensile load