JPH0111800Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a joining device for structural members, particularly segments constituting underground rooms, tunnels, etc.

Problems to be solved by the invention When constructing an underground structure by assembling segments, for example, by assembling prefabricated steel panels, waterproof seals are interposed between the panel members to prevent water leakage and maintain airtightness. They are joined by pressure contact using fasteners such as bolts and nuts. However, since commonly used waterproof sealing materials are not completely elastic, bolts and nuts may loosen over time. Especially when there are many bolts, it is difficult to tighten the waterproof sealant at the same time or uniformly, and since the waterproof sealant may flow slowly after tightening, it is necessary to tighten the waterproof sealant several times at intervals to prevent the bolts from loosening. The current situation is to stabilize it by re-tightening it. In addition, this often results in the waterproof sealing material being overtightened, sometimes causing the waterproof sealing material to protrude.

This invention was devised to solve the problems of the conventional art.

Structure of the invention and its embodiments The gist of this invention is as described in the claims section of the above-mentioned utility model registration, and its main parts are smaller than the thickness of the sealing material, and are suitable for proper tightening of the sealing material. The purpose of this invention is to use a sealing material incorporating a piece of hard material having a thickness equal to that of the present invention, the details of which will be explained below by way of examples. In the embodiment shown in FIGS. 1 to 3, the sealing material 1 is a flexible band-shaped material made of rubber thread or synthetic resin thread and having considerable elasticity, watertightness, and airtightness.

The hard material piece 2 is made of a steel ball, a hard synthetic resin disk, etc., and has a thickness W smaller than the thickness W of the sealing material 1.
The thickness is determined based on the material of the sealing material, etc. so that the thickness is equal to the proper tightening thickness of the sealing material, and the sealing material is assembled in the middle part of the sealing material 1 at a constant interval.

The sealing material 1 described above is interposed between structural members 3 made of steel plates or the like, and is pressed against a fastener 4 such as a bolt or nut.

Figures 4 to 6 show another embodiment in which a washer with a plurality of protruding claw pieces 5 is used as the hard material 2. In this case, the hard material 2 needs to be buried in advance. When the bolt is inserted and tightened over the sealing material 1, the hard material 2 bites into the sealing material 1. Since the claw pieces 5 are present, the sealing material 1 can be tightened to an appropriate thickness.

Effects of the invention This invention consists of the above-mentioned structure. When tightened with a tightening tool, the sealing material is not compressed to be thinner than the existing hard material, but is held at an appropriate thickness, and if it is overtightened, excessive compressive force is This will not damage the function of the sealing material. Furthermore, the compressive force applied to the hard material generates a frictional force between the hard material and the structural member, which can prevent the sealing material from shifting or extruding between them.

[Brief explanation of the drawing]

1 and 2 are front views showing the embodiment before and after tightening, and FIG. 3 is a sectional view of the sealing material.
4 and 5 are front views of another embodiment, and FIG. 6 is a sectional view of the sealing material. 1... Seal material, 2... Hard material, 3... Structural member, 4... Fastener, 5... Claw piece.

Claims (1)

[Scope of utility model registration request] The flexible sealing material incorporates a piece of hard material having a thickness smaller than the thickness of the sealing material and equal to the proper tightening thickness of the sealing material, and the sealing material is interposed between structural members and fastened together. A joining device for structural members, characterized in that they are pressed together by a tool.