Fastening method and apparatus in a high-fluid pressure environment

Abstract

To provide a thin and long fastening member such as a bolt or a stad, and a method and device for applying a tensile force to the same.SOLUTION: Provided are: a body part formed to engage with or integrally with a thin and long fastening member, the body part having a plurality of holes provided at a position apart from an outer periphery thereof with a uniform interval from a center axis in a longitudinal direction, the body part including a side wall on which a body thread is formed; a jack bolt for engaging with the body thread at one of the holes; and a load support member for applying force to a workpiece to be fastened and arranged to position around the thin and long fastening member, the load support member having a first annular face connected to a second annular face via an inner wall and an outer wall, and a cylindrical lip projecting from the first annular face, the cylindrical lip having a wall continuous with the inner wall and being configured to form a seal with the workpiece to be fastened. The load support member further includes a second concentric projection projecting from the second annular face.SELECTED DRAWING: Figure 3

Claims

1. It is a multi-jack bolt tensioner: A main body formed to engage with or integrally formed with an elongated fastening member, the main body having a plurality of holes uniformly spaced apart from the longitudinal central axis at spaced-apart positions around its outer circumference, the main body having side walls on which threads are formed; A jack bolt, each containing a body having a thread in one of the holes of the main body for engaging with the thread of the main body; and A load-bearing member for applying force to a workpiece to be fastened, positioned around an elongated fastening member, the load-bearing member comprising a first annular surface connected to a second annular surface by an inner wall and an outer wall, and a cylindrical lip protruding from the first annular surface, the cylindrical lip comprising a wall continuous with the inner wall, and the cylindrical lip configured to form a seal with the workpiece to be fastened; Equipped with, The load-supporting member further comprises a second concentric projection protruding from the second annular surface, thereby comprising a multi-jack bolt tensioner.

2. The multi-jack bolt tensioner according to claim 1, wherein the wall protrudes slightly away from the plane of the inner wall.

3. The multi-jack bolt tensioner according to claim 1 or 2, wherein the cylindrical lip comprises a second wall that protrudes away from the first annular surface.

4. The multi-jack bolt tensioner according to any one of claims 1 to 3, wherein the load-supporting member further comprises concentric projections protruding from the first annular surface.

5. The multi-jackbolt tensioner according to any one of claims 1 to 4, wherein the cylindrical lip is configured to form a seal with the workpiece, the main body, the jackbolt, and / or the elongated fastening member.

6. The multi-jack bolt tensioner according to any one of claims 1 to 5, wherein the cylindrical lip is configured to form a seal with the elongated fastening member.

7. The multi-jack bolt tensioner according to any one of claims 1 to 6, wherein the cylindrical lip is configured to form a seal with the main body.

8. The jack bolt is in contact with the load-supporting member, as described in any one of claims 1 to 7, for the multi-jack bolt tensioner.

9. A method for compressing the first workpiece and the second workpiece together: A step of placing a load-supporting member on the first workpiece, wherein the load-supporting member comprises a first annular surface connected to a second annular surface by an inner wall and an outer wall, and a cylindrical lip protruding from the first annular surface, the cylindrical lip comprising a wall continuous with the inner wall, the cylindrical lip configured to form a seal with the first workpiece or the second workpiece, and the load-supporting member further comprising a second concentric projection protruding from the second annular surface; A step of placing the main body on the load-supporting member, wherein the main body engages with or is integrally formed with an elongated fastening member, and the main body has a plurality of holes uniformly spaced apart from the longitudinal central axis at spaced-apart positions around its outer circumference, and the holes have side walls on which threads are formed; A step of capturing the elongated fastening member on the outside of the second workpiece; A step of connecting a jack bolt, which includes a body having threads that engage with the threads of the body, to each of the holes in the main body; A method comprising the step of applying tension to the jack bolt, thereby compressing the first workpiece and the second workpiece toward each other.

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