JPH045606Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a threaded joint for concrete segments.

[Prior art]

Conventionally, as a joint for concrete segments, a joint recess is provided at the end of each concrete segment to be joined, and a PC buried in each concrete segment is used, as disclosed in Japanese Patent Application Laid-Open No. 191868/1986. The end of the steel material is made to protrude into the recess, and the flange of a sleeve nut having a flange on the inner periphery of the base end is fitted into the protruding end of one of the PC steel materials, and the flange is located inside the sleeve nut. The engagement nut and the nut located on the outside of the sleeve nut are screwed together, the sleeve nut is screwed to the joint nut screwed to the protruding end of another prestressing steel material, and the flange of the sleeve nut is screwed together. A joint is known that is configured to engage with an engagement nut.

However, in the case of this joint, a pulling tool with a jack is engaged with the nut of one PC steel material and the joint nut of the other PC steel material, and the pulling tool pulls each through the nut and the joint nut.
The sleeve nut must be screwed into the joint nut while the PC steel rods are drawn together, making the connection work complicated. Since dowel nuts, sleeve nuts, joint nuts, etc. are installed, there is a problem in that the concave portion of each concrete, that is, the section missing portion becomes large.

[Purpose of the invention, structure]

The purpose of this invention is to provide a concrete segment joint that can advantageously solve the above-mentioned problems, and the gist of this invention is that each concrete segment 1,
2 is provided with joint recesses 3 and 4, and a hollow joint fitting 6 having a locking flange 5 on the inside of the tip is buried in one of the concrete segments 1, and the base end of the hollow joint fitting 6 is The hollow part of the hollow joint fitting 6 is connected to a connecting steel rod 7 buried in one of the concrete segments 1, and opens into the joint recess 3, and an engaging flange 8 is formed on the outer periphery of the base end.
A connecting nut 9 having a locking flange 5
A male thread 10 is provided on a connecting steel rod 7 that is slidably and rotatably inserted into the other concrete segment 2 and is buried in the other concrete segment 2 and protrudes into the joint recess 4. Male thread 10
The concrete segment joint is characterized in that the engaging flange 8 of the connecting nut 9 is engaged with the locking flange 5 of the hollow joint fitting 6.

〔Example〕

Next, this invention will be explained in detail using illustrated examples.

Figures 1 to 4 show a first embodiment of this invention, in which joint recesses 3 and 4 are provided in each of the concrete segments 1 and 2 to be connected, and a circular locking hole is provided inside the tip. A hollow joint fitting 6 equipped with a flange 5 and an end plate 11 at its base end is buried in one of the concrete segments 1, and the male screw 12 of the connecting steel bar 7 buried in the concrete segment 1 is connected to the The female screw hole of the end plate 11 is screwed into the lock nut 13 which is pressed against the end plate 11, and the end surface of the hollow joint fitting 6 is exposed to the bottom surface of the joint recess 3. The hollow portion of the connecting steel rod 7 opens into the joint recess 3, and the tip end of the connecting steel rod 7 projects into the joint recess 3.

A connecting nut 9 having a circular engagement flange 8 on the outer periphery of the proximal end and a female thread on the inner periphery of the distal end is slidably and rotatably inserted into the locking flange 5. The tip of the joint recess 3
A polygonal surface for engaging a rotating tool such as a spanner is formed on the outside of the protrusion of the connecting nut 9. Further, a connecting steel rod 7 buried in the other concrete segment 2 projects into the joint recess 4, and a male thread 10 is provided in the protruding portion of the connecting steel rod 7.

When transporting the segments, as shown in FIG. 3, by screwing the connecting nut 9 into the male thread 12 of the connecting steel rod 7, the connecting nut 9 is held so that it does not protrude from the end surface of the concrete segment 1. Therefore, it is possible to prevent the connecting nut 9 from being deformed or damaged by hitting other objects during transportation of the segments.

When connecting each concrete segment 1, 2, as shown in FIG. 3, the end faces of each concrete segment 1, 2 are joined to each other, and
The center of the connecting steel rod 7 in the concrete segment 2 and the center of the connecting nut 9 in the concrete segment 1 are arranged so that they are located on the same straight line, and then as shown in FIG.
is rotated in the withdrawal direction and screwed into the male screw 10 of the connecting steel rod 7, and the engaging flange 8 of the connecting nut 9
is engaged with the locking flange 5 of the hollow joint fitting 6, and the connecting nut 9 is tightened. Next, the joint recesses 3 and 4 are filled with a curable filler such as mortar.

5 and 6 show a second embodiment of this invention, in which a shaft rod 14 is slidably and rotatably inserted into a locking flange 5 of a hollow joint fitting 6.
An engagement flange 8 is integrally provided at the base end of the shaft rod 14, and a nut 15 is integrally provided at the tip of the shaft rod 14 to form the connecting nut 9, but the other configurations and connection order are as follows. This is the same as in the first embodiment.

When implementing this idea, reinforcing bars buried in concrete segments may be used as the connecting steel rods 7.

This invention can be applied to both joints between segments constituting a segment ring and joints between segments in adjacent segment rings.

[Effect of idea]

According to this invention, joint recesses 3, 4 are provided in each concrete segment 1, 2 to be connected,
A hollow joint fitting 6 having a locking flange 5 on the inside of its tip is buried in one of the concrete segments 1, and the base end of the hollow joint fitting 6 is a connecting steel buried in one of the concrete segments 1. A connecting nut 9 coupled to the rod 7 and having an engaging flange 8 on the outer periphery of the base end is slidably and rotatably fitted into the locking flange 5, and is buried in the other concrete segment 2 to form a joint. Recess 4
Since a male thread 10 is provided on the connecting steel rod 7 that protrudes inward, simply rotate the connecting nut 9 attached to one of the concrete segments 1 to connect the connecting steel rod 7 attached to the other concrete segment 2. By performing a simple operation of screwing into the male screw 10, each concrete segment 1, 2 can be easily and quickly connected,
Furthermore, since the hollow joint fitting 6 is buried in the concrete segment 1 and the connecting nut 9 is fitted into the hollow joint fitting 6, the protrusion length of the joint member into the joint recess 3 can be shortened, and the joint The protrusion length of the connecting steel rod 7 into the recess 4 is also short, and therefore the depth of the joint recesses 3 and 4 in each concrete segment 1 and 2 is made shallow to reduce the cross-sectional loss of each concrete segment 1 and 2. Effects such as being able to do this can be obtained.

[Brief explanation of drawings]

1 to 4 show a first embodiment of this invention, and FIG. 1 is a partially cutaway side view of a concrete segment having a joint of this invention;
FIG. 2 is a front view showing the vicinity of the joint portion of the segments, FIG. 3 is a longitudinal side view showing a state in which the segments to be connected are joined, and FIG. 4 is a longitudinal side view showing a state in which the segments are connected. 5 and 6 show a second embodiment of this invention, in which FIG. 5 is a longitudinal side view showing the state in which the segments to be connected are joined, and FIG. 6 is the state in which the segments are connected. FIG. In the figure, 1 and 2 are concrete segments, 3 and 4 are joint recesses, 5 is a locking flange, 6 is a hollow joint fitting, 7 is a connecting steel bar, 8 is an engaging flange, 9 is a connecting nut, 10 and 12 are 14 is a shaft rod, and 15 is a nut.

Claims (1)

[Scope of utility model registration request] Joint recesses 3 and 4 are provided in each of the concrete segments 1 and 2 to be connected, and a hollow joint fitting 6 having a locking flange 5 inside the tip is buried in one of the concrete segments 1,
The base end of the hollow joint fitting 6 is connected to a connecting steel rod 7 buried in one of the concrete segments 1, and the hollow part of the hollow joint fitting 6 opens into the joint recess 3, and the outer periphery of the base end A connecting nut 9 provided with an engaging flange 8 is slidably and rotatably fitted into the locking flange 5, and a connecting steel rod 7 is embedded in the other concrete segment 2 and projects into the joint recess 4. is provided with a male thread 10, and the connecting nut 9 is screwed into the male screw 10 of the connecting steel bar 7, and the engaging flange 8 of the connecting nut 9 is engaged with the locking flange 5 of the hollow joint fitting 6. A concrete segment joint characterized by: