JPS603851Y2 - Joint fittings for concrete structures - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a joint fitting for concrete structures suitable for joining, for example, prefabricated structures.

For current concrete structures, so-called unit prefabricated construction materials, which are planned and mass-produced in factories, are widely used as construction materials for various aspects such as shortening the construction period, reducing construction costs, and improving work efficiency.

By the way, research and development of many of the above-mentioned unit prefabricated construction materials to date has focused on the shape structure of the prefabricated construction materials or the prefabrication of these materials or concrete molding.

As a result, for example, it has become possible to mass produce lightweight, strong, and inexpensive concrete structures.

However, as mentioned above, these conventional concrete structures are prefabricated in order to reduce weight and strengthen strength, as well as to contrast with cast-in-place structures.For example, joints in assembling prefabricated concrete structures The structure used bolt, nut, and welded connections.

Therefore, it could not be said that the initial objectives of conventional prefabrication, namely shortening the construction period, reducing construction costs, and improving work efficiency, were sufficiently effective.

This idea was made in view of the above circumstances, and its purpose is to place two sets of insert fittings with different chuck functions facing each other on the joint end surfaces of prefabricated mass-produced concrete structures. To provide a joint fitting which is embedded and which connects adjacent concrete structures with one touch by interposing a relay fitting having a locking part corresponding to the chuck function between both insert fittings.

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

FIG. 1 shows the structure of the joint fitting.

1 in the figure is a relay fitting.

A male thread 2 is formed on the outer periphery of one end of this relay fitting 1, and a plurality of grooves 3 (wedge-shaped) are formed on the outer periphery of the other end.
is formed.

Reference numeral 4 designates a first metal insert, and the inner wall of the first metal insert 4 is provided with a female thread 5 that engages with the male thread 2 formed at one end of the relay metal fitting 1.

Reference numeral 6 denotes a second metal insert, and a groove 7 is formed in the inner wall of the second metal insert 6, and a plurality of grooves 3 formed at the other end of the relay metal fitting 1 are formed in the groove 7.・・・・・・
A plurality of spring rings 8, which fit into the spring rings 8, are housed inside.

The first and second insert fittings 4 configured in this way
, 6 are used by being buried in a concrete structure, for example, a concrete segment 9, as shown in FIG.

That is, the first metal insert 4 is buried in the joint surface on the concrete segment 9 side, and the second metal insert 6 is buried in the joint surface on the other side.

The first and second insert fittings 4 and 6 are connected to each other by an anchor reinforcing bar 10, as shown in the figure, so that they will not fall.

The above-mentioned relay fitting 1 is screwed onto the first insert fitting 4 buried in the concrete segment 9 in this manner.

The other end (projecting end) of the relay fitting 1 screwed in this manner is inserted into a second insert fitting 6 embedded in another segment 1.

In this way, the inter-ring joining (connection) of the concrete segments 9 is performed.

FIG. 3 shows how to connect the culvert 20 using the first and second insert fittings 4.6 and the relay fitting 1. As shown in FIG.

Next, the functions and effects of the joint fitting having the above structure will be explained.

The first and second insert fittings 4 and 6 are used by being buried in the joint surface of the concrete structure to be joined, so unlike conventional fittings that use bolts and nuts, they do not leave any spaces in the concrete structure. There is no need to provide one, so the bottom shape of the structure itself can be simplified.

This also acts as a major positive condition for strengthening the strength of concrete structures.

On the other hand, looking at the effects of joining, the relay fitting 1
One end is screwed onto the first insert fitting 4, and the other end is screwed onto the second insert fitting 4.
Since the concrete structures are connected by being inserted into the insert fittings 6 of the concrete structures, the work of joining the concrete structures together becomes very simple, and a strong connection is possible.

In addition, positioning of concrete structures becomes extremely easy, and the final joint strengthening work, which corresponds to conventional so-called retightening, can be performed by jacking up the entire structure, which simplifies the work.

This is used to secure the other end of the relay fitting 1 with the spring ring 8.
This is the effect due to the fact that...

In addition, in order to accurately catch the slight movement (compression) of the structure due to final jacking up and fix the relay fitting 1, use the spring ring 8 mentioned above with the bottom shape as thin as possible. do it.

Furthermore, since the joint fitting 1 of the present invention is not exposed to the outer surface of the structure, it has various effects such as less corrosion, no leakage of rust, etc., and an aesthetically excellent surface finish of the structure.

Moreover, especially according to the present invention, the spring ring 8 is composed of a plurality of (three) spring rings, each of which engages with the corresponding groove 3, so that the engagement force is Of course, the engagement strength (yield strength) between the two is also sufficiently large, thereby exhibiting sufficient tensile strength.

Furthermore, since the spring ring 8 is composed of a plurality of pieces as described above, it is possible to make each spring ring 8 sufficiently thin as shown in the illustrated example, and thereby the pitch of the groove 3 can be made to correspond to the spring ring. Therefore, the fine adjustment function is improved accordingly, and as a result, the gap between the joint end surfaces can be made extremely small, which is an excellent effect that has not been seen before.

[Brief explanation of drawings]

FIG. 1 is a sectional view of the joint fitting, FIG. 2 is a sectional view of the concrete segment, and FIG. 3 is a perspective view of the culvert before joining. 1... Relay fitting, 2... Male thread, 3...
...Groove (wedge shape), 4...First insert fitting, 5...Female thread, 6...Second insert fitting, 7... ...Concave groove, 8...
・Spring ring.

Claims (1)

[Scope of utility model registration request] A relay metal fitting having a thread formed on the outer periphery of one end and a plurality of grooves formed on the outer periphery of the other end, a first insert metal fitting formed with a female thread that is screwed into one end of the relay metal fitting, and the other end of the relay metal fitting. The first and second insert fittings are buried so as to face the joint end surface of the concrete structure to be joined, and the relay fitting is inserted between both insert fittings. In a joint fitting for a concrete structure that connects concrete structures that require jointing by interposing a A joint fitting for a concrete structure, characterized in that it has an engaging configuration.