JPS5820719Y2 - Concrete segment fittings - Google Patents

Description

[Detailed description of the invention] This invention relates to an insert type concrete segment joint fitting.

Conventional insert type fittings are made by drilling a hollow part to a predetermined depth from one end of a bar-shaped metal member, cutting screws throughout the inner wall of this hollow part, and connecting the open end of this hollow part to the end end face and side end face of a concrete segment. (planned joint location) and all other parts were buried.

In these insert-type fittings, the screws are cut into the entire inner wall of a hollow part drilled from one end of the fitting, i.e., a bar-shaped metal member, so once the fitting is buried and integrated in concrete. and the position cannot be changed (corrected) at all.

Therefore, even if a slight positional shift occurs when connecting the conchnaut segments, the bolt facing the screw cannot be screwed into place.

Conventionally, the misalignment of the concrete segment was corrected by inserting a jig into the hollow part of the joint and prying it up.

However, the hollow part into which the tip of the jig is inserted is threaded as described above, so when the jig is pried, the thread is crushed and the bolt cannot be inserted.

This idea was made in view of the above circumstances, and its purpose is to provide a nut storage section in the hollow part of the bolt insert of the joint fitting that communicates with the hollow part from the side of the fitting fitting, and to provide a nut storage section with a predetermined shape in the nut storage section. After storing the nut in a somewhat movable manner and closing the opening of this nut storage part, a bolt was inserted into the hollow part facing the end and side of the buried segment with concrete and screwed together with the stored nut. be.

An embodiment of this invention will be described in detail below based on the drawings.

FIG. 1 shows the structure of a joint fitting 1 according to this invention, which is constructed around a bar-shaped metal body 1, which is thick near one end and becomes thinner toward the other end, for example, in the shape of a steel sagittal. This large diameter portion 2 is provided with an insert hollow portion 4 into which a bolt 3 is inserted from the end face.

Further, a nut accommodating portion 5 that communicates with the insert hollow portion 4 is bored in the side of the large diameter portion 2.
A nut 6, which is screwed into the bolt 3, is inserted into the hole.

By the way, the width of the insert hollow part 4 and the nut accommodating part 5, that is, the cavity area is such that the insert hollow part 4 is bored as a hollow part into which the bolt 3 can be inserted with some margin, and the nut accommodating part 5 is In this case, the nut 6 should be wide enough to prevent it from rotating freely when screwed into the bolt 3, and at the same time be wide enough to allow the nut 6 to be properly screwed in even if the bolt 3 is inserted somewhat eccentrically. drilled.

On the other hand, the small diameter portion 7 of the main body 1 has flanges 8 at the middle and end portions.
, 9 are integrally formed.

Further, a lid 10 is fitted into the opening of the nut storage section 5.

FIG. 2 shows a concrete segment 11 in which a joint fitting having the above-mentioned structure is buried.

FIGS. 3A and 3B are cross-sectional views of the joint fittings during and after connection.

Next, the operation of this invention using the above configuration will be explained.

First, when burying the joint fittings, the joint fittings are placed in a predetermined position depending on the size of the concrete segment 11, and then the nuts 6 are placed in the nut storage portion 5 of each fitting.
to store.

Then, by attaching the cover body 10, concrete is prevented from flowing into the nut storage portion 5, and a required amount of concrete is poured to form a concrete segment 11.

The segments 11 formed in this way are connected in the third
This is done as shown in the figure, but if the insert hollow part 4 of the joint fitting does not match the bolt hole of one segment 11 due to positional deviation of the segments 11 during this connection, the bolt 3 should be inserted accurately. The insert cannot be inserted into the hollow part 4, but in the case of this invention, unlike conventional fittings, the insert hollow part 4 is not threaded, so even if a specified jig is inserted and pried, the thread cannot be removed. Since there is no risk of the jig being crushed, a fairly strong correction force can be applied to the jig.

Therefore, even a fairly large positional deviation can be corrected as quickly and accurately as possible.

In addition, the displacement of the bolt hole with respect to the insert hollow part 4 is slight, and when the bolt 3 is eccentrically displaced, the insert hollow part 4
If the nut 6 can be inserted into the hole, the nut 6 is stored with some play, so even if the bolt 3 is inserted as is, the tip can accurately locate the nut 6 and screw it together.

By the way, the nut 6 is screwed into the bolt 3, and as the bolt 3 rotates, the nut 6 is screwed.

Upon this screwing, the nut 6 rotates with the bolt 3 due to the play, as shown in Fig. 3B, but afterward it comes into contact with the inner wall of the nut housing 5 and is blocked, so it does not rotate freely and is properly screwed. I can wear it.

By the way, since the circumferential shape of the large diameter portion 2 of the main body 1 is formed into a polygonal shape as shown in the figure, it will not rotate when the bolt 3 is screwed on.

In addition, to prevent the joint fittings from being pulled out after connecting both segments 11, the main body 1 is
, 9, the bolt 3
The tensile force given by is distributed and transmitted to the concrete at the portions indicated by X, Y, and Z in FIG. 3A.

Therefore, since the force is not concentrated on a specific part of the joint metal fitting, no shear failure occurs in the concrete, and the joint metal fitting is stably held without coming off.

In the above embodiments, the shape of the main body 1 was explained as a sagittal steel rod, but such a shape can be modified in various ways without departing from the gist of the present invention, and the above shape may not be used. It is not limited only to

Furthermore, although it was explained in the above embodiment, for example, if a waterproof grommet made of synthetic resin or the like is attached to the open end of the insert hollow part 4 of the joint fitting to prevent water from entering the insert hollow part 4, the bolt 3, nuts 6, etc. can be effectively prevented from rusting, and the life of the joint fittings can be extended.

Since this device has the above-described structure and function, it can be used in cases where there is a misalignment between the two segments when connecting the segments, and the bolt cannot be smoothly inserted into the hollow part of the insert of the fitting. Even if there is, there are no screws cut in the hollow part of the insert like in conventional fittings, so you can insert a jig into this part and use a fairly strong force to pry it open to correct the position of the segments. Even if there is some positional deviation between them, the positions of the bolt and the hollow insert can be quickly and accurately matched, the bolt can be inserted smoothly, and a predetermined connection can be achieved.

In addition, the inserted bolt and nut are screwed together with some play in the nut itself, so even if the bolt is slightly eccentric despite the above correction, it will screw together extremely smoothly. Therefore, the connecting operation can be performed more quickly.

Furthermore, since the structure of the joint fitting itself is extremely simple, it has various effects such as being easy to manufacture and being able to be provided at low cost.

[Brief explanation of the drawings] Figure 1 is an overall perspective view of the joint fitting according to this invention;
The figure is a cutaway perspective view of the main part of a concrete segment in which the above-mentioned joint fittings are buried, Figures 3A and B show the connected state of the joint fittings, Figure A is a longitudinal cross-sectional view of the main parts, and Figure B is the joint fittings. FIG. 1... Joint fitting, 2... Large diameter part, 3...
...Bolt, 4...Insert hollow part,
5... Nut storage section, 6... Nut (
polygon), 7... small diameter section, 8, 9... flange, 10... lid body, 11... concrete segment.

Claims (1)

[Scope of utility model registration request] A fitting body having a large diameter near one end and a small diameter at the other end with flanges provided at appropriate locations, a hollow part for inserting a bolt drilled in the axial direction from the large diameter tip of the main body, and the hollow part. A nut storage part bored in the side of the large diameter part so as to intersect inside the nut storage part, a polygonal nut stored in the nut storage part with some play, and a lid for closing the opening of the nut storage part. A joint fitting for a concrete segment, characterized in that the tip of the hollow part of the bolt insertion insert faces the side surface of the segment, and the other part is buried in concrete.