JPH0346079Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a joint structure for concrete structures such as concrete segments used in constructing railway tunnels, underground passages, etc., for example.

``Conventional technology'' For example, when connecting concrete segments, insert fittings with spring rings inside are buried in the joining end faces of the concrete segments, and the insert fittings are positioned facing each other at the time of joining. It is known that predetermined concrete segments are joined with one touch by interposing a joint fitting provided with a groove that engages with a spring ring in the insert fitting.

``Problem that the invention attempts to solve'' However, as mentioned above, when connecting concrete segments using a joint fitting and a pair of insert fittings, the grooves on the outer periphery of both ends of the fitting and each insert fitting Because the spring rings inside engage with each other, the concrete segments are strong against forces that try to separate them, but the forces that try to push the concrete segments together are small compared to the above tensile strength, so the concrete segments A gap is likely to occur between the joint end faces of the

This invention was made in view of the above circumstances,
The purpose is to provide a joint structure for concrete structures that can firmly tighten and connect concrete structures to be joined to each other and prevent gaps from forming between joint end faces of the concrete structures. There is a particular thing.

"Means for Solving the Problems" In order to achieve the above object, the present invention provides the following methods:
A pair of insert metal fittings are buried respectively, and a box cut-out part that communicates with the inside of each insert metal fitting through a bolt hole is formed in both concrete structures with openings on the surface adjacent to the joint end surface. , a joint fitting in which threaded portions protrude from both end surfaces of the pin body and grooves that engage with a spring ring built into the insert fitting are formed on the outer periphery of both ends of the pin body, within both insert fittings and between the bolt holes. and a fastening nut is attached to each screw portion protruding from both box cutout portions.

"Operation" In the joint structure of the present invention, the pin body of the joint fitting is fitted into a pair of insert fittings, the groove of the pin body and the spring ring in the insert fitting are engaged, and the box cutout part The concrete structures are firmly connected by tightening each of the protruding screw parts with a fastening nut.

"Embodiment" Hereinafter, an embodiment of the present invention will be described based on FIGS. 1 and 2.

In the figure, numerals 1 and 2 are concrete structures such as concrete segments that are connected to each other, and these concrete structures 1 and 2 are
Insert metal fittings 3 and 4 are buried in mutually joining end surfaces 1a and 2a, respectively.

The metal inserts 3 and 4 have a plurality of spring rings 6 each mounted in a groove 5 formed in the middle part of the inner surface of a cylindrical body. Then, the above-mentioned joint end surface 1 of each insert metal fitting 3, 4
Flange plates 7 and 8 are embedded in the ends opposite to a and 2a, respectively. Bolt holes 7a and 8a are formed in these flange plates 7 and 8, respectively, with their center lines aligned with the axes of the respective insert fittings 3 and 4. Box cutout portions 9 and 10 communicating with the inside of each of the insert fittings 3 and 4 via bolt holes 7a and 8a are opened in surfaces 1b and 2b adjacent to each of the joining end surfaces 1a and 2a, respectively. It is formed on both concrete structures 1 and 2 in this state.

Each of the above insert fittings 3 and 4 has a fitting fitting 1.
One pin body 12 is fitted in a plurality of wedge-shaped grooves 12a, 12a formed on the outer periphery of both ends of the pin body 12, so as to be engaged with the spring rings 6 in each of the insert fittings 3, 4. On both end surfaces of the pin body 12 of the joint fitting 11, threaded portions 13 and 14 each having a diameter smaller than that of the pin body 12 are provided.
are provided protruding from the left and right. These screw portions 13 and 14 are inserted into the bolt holes 7a and 8a of the flange plates 7 and 8 and protrude toward the box cutout portions 9 and 10, respectively, and are inserted into the fastening nuts 15 and 14, respectively.
16 to both flange plates 7, 8.

When connecting the concrete structures 1 and 2 configured as described above, first, with the joint fitting 11 interposed between the joint end surfaces 1a and 2a of both concrete structures 1 and 2, By press-joining both concrete structures 1 and 2 using a nail, both threaded parts 13 and 14 of the joint fitting 11 are connected to each concrete structure 1 and 2.
The bolts 47a and 8a of the flange plates 7 and 8 buried in the joint fittings 1
1 pin body 12 to each concrete structure 1,
2 into both insert fittings 3 and 4 embedded in the insert fittings 3 and 4. As a result, the spring ring 6 in both the insert fittings 3 and 4 is inserted into the pin body 1.
Since the concrete structures 1 and 2 are engaged with the grooves 12a of No. 2 and exhibit sufficient tensile strength, the concrete structures 1 and 2 are not separated and are easily positioned and fixed.

Next, both threaded portions 13, 1 of the joint fitting 11 are inserted through the bolt holes 7a, 8a of the flange plates 7, 8 and protrude toward the respective box cutout portions 9, 10.
Screw the fastening nuts 15 and 16 onto the tips of 4,
By fastening the joint fittings 11 to both flange plates 7 and 8, both concrete structures 1 and 2 are firmly connected. At this time, the pin body 12 of the joint fitting 11 has already been inserted inside both the insert fittings 3 and 4.
Both concrete structures 1,
Since the two parts are positioned and fixed in a matching manner, the nut tightening operation is extremely easy. Since both the flange plates 7 and 8 are strongly pressed together by the respective fastening nuts 15 and 16, even if the two insert fittings 3,
At the stage when the pin body 12 is fitted into the inside of the pin body 4,
Joint end faces 1a, 2 of both concrete structures 1, 2
Even if there is some gap between a, the gap is quickly and reliably eliminated, and both bonded end surfaces 1a and 2a
They are strongly connected.

"Effects of the Invention" As explained above, in the present invention, the engagement force between the groove of the pin body of the fitting and the spring ring in the insert fitting, and the relationship between each threaded part of the fitting and the fastening nut are improved. The combination of the tightening forces allows the concrete structures to be joined to each other to be firmly connected, and there is no gap between the joint end faces of the concrete structures, and the connection work can be performed easily. It has excellent effects.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the present invention, in which FIG. 1 is a sectional view, and FIG. 2 is a view taken along the - line in FIG. 1. 1, 2... Concrete structure, 1a, 2a...
...Joining end surfaces, 1b, 2b...Adjacent surfaces, 3, 4...
...insert metal fitting, 6...spring ring, 7
a, 8a... Bolt hole, 9, 10... Box cutout,
11...Joint fitting, 12...Pin body, 12a...
...Groove, 13, 14...Threaded part, 15, 16...
Concluded nuts.

Claims (1)

[Scope of utility model registration request] A pair of metal inserts is buried in both joint end faces of the concrete structures to be connected to each other, and a spring ring is installed on the inner surface of each of the metal inserts, and a bolt hole is inserted into the inside of each of the metal inserts. A communicating box cutout is formed in each of the concrete structures with openings on the surfaces adjacent to the joint end surface, while threaded portions are provided protruding from both end surfaces of the pin body,
A joint fitting formed by forming grooves on the outer periphery of both ends of the pin body for engaging the spring ring is interposed within both the insert fittings and between the bolt holes, and also protrudes into both the box cutout portions. A joint structure for a concrete structure, characterized in that a fastening nut is attached to each screw part.