JPS602311Y2 - Concrete segment hanging metal fittings - Google Patents

Description

[Detailed Description of the Invention] This invention relates to the structure of a metal fitting that is attached to the backfill injection hole of a comfort segment for shield lining and is also used for attaching a hanging tool to the segment.

For example, as shown in Fig. 5, the structure of a conventional lifting hand fitting is such that a thread b for attaching the lifting fitting is provided on the inner surface of one end of a thick-walled steel pipe a cut to match the thickness of the segment, and Anchor reinforcing bars for anchoring to concrete etc.
A metal fitting with c attached by welding is used.

However, this type of hanging metal fittings not only requires a lot of work to process and weld the reinforcing bars, but also uses thick-walled steel pipes to maintain the strength of the threaded side part. Even parts that don't require thick walls are uniformly thick, resulting in high costs.

Further, since the main body formed to the same size cannot be used for segments of different thickness, there is a disadvantage that it is necessary to prepare segments of different lengths.

In order to eliminate these drawbacks, this invention uses thick-walled steel pipes only in the parts that require strength, and also forms shoulders in these thick-walled parts to improve engagement with the comfort. The shape does not require anchor reinforcing bars, and the other parts are made of thin-walled steel pipes that are sufficient to hold the holes for injecting backing material, and this is inserted and fixed into the main body to save the amount of steel material. At the same time, by changing only the cutting length of this thin-walled steel pipe, it can be adapted to segments with different thicknesses.If the structure is explained with reference to the embodiment shown in the drawings, 1 is a suspension made of thick-walled steel pipe. This is a hand fitting main body, one end of which is expanded by pressing to form a socket part 2, a shoulder part 3 is provided on the outside of the socket part 2, and a female thread 4 for attaching a hanging tool is provided on the inner surface of the other end.

Next, 5 is a thin-walled steel tube, its outer diameter is formed to a size that allows it to be inserted and fixed into the socket part 2 of the main body, and its length is determined so that the length X when it is inserted and fixed into the main body 1 is It is configured to match the thickness of the segment.

The lifting hand fitting main body 1 constructed as described above is fixed at a predetermined position in a formwork for segment production, and concrete is poured to produce a concrete segment A as shown in Fig. 4. This segment is set. When lifting by screwing the threads of the lifting tool B onto the female threads 4 of the lifting hand fitting main body 1 in order to move it to a certain location, the outer shoulder portion 3 of the socket portion 2 of the main body 1 is strongly engaged with the segment. It is possible to fully exhibit the pulling resistance force.

In this way, the shoulder part is made up of the threaded part that screws the hanging tool and the part that engages with the segment, and the other parts are made of separate thin-walled steel pipes that are fitted and fixed to the main body, so the entire structure is It is lighter and can be provided at a lower cost than those constructed from thick-walled steel pipes.

Therefore, in order to adapt to segments of different thickness,
By preparing thin-walled steel pipes of different lengths and selecting and using them as appropriate, the thick-walled main body can be used as is for all.

After being set at a predetermined location in this way, the hanging tool is removed and used as a backfilling injection hole.

[Brief explanation of the drawing]

Fig. 1 is a side view, Fig. 2 is a plan view, Fig. 3 is a cut side view, Fig. 4 is a cut side view of how it is used, and Fig. 5 is a perspective view showing an example of a conventional hanging hand fitting. . 1... Hanging hand fitting body, 2... Socket part, 3... Shoulder part, 4... Female thread, 5...
...Thin-walled steel pipe.

Claims (1)

[Scope of utility model registration request] One end is expanded by pressing to form a socket part 2, and a shoulder part 3 is formed on the outside of the thick-walled steel pipe 1. A female thread 4 for attaching a sling is provided on the inner surface of the other end. A lifting hand fitting for a comfort segment that is integrated by inserting and fixing a thin-walled steel pipe 5.