JP2560068Y2 - Metal fittings for concrete segments - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a concrete segment which is assembled into a large number of excavated holes to form a wall when constructing tunnels for railways and motorways, underground passages, sewerage, etc. And a metal fitting for a concrete segment, which is used to join the joints to each other.

[Prior art] To construct walls such as tunnels and sewers, generally,
Using a plurality of arc-shaped plate-shaped concrete segments (hereinafter simply referred to as segments) which are cylindrical in a connected state,
A method has been adopted in which these are sequentially joined and assembled while being fitted to the wall surface of an underground excavation hole (generally a circular cross section).

Conventionally, when joining these segments to each other, as shown in FIGS. 5 and 6, a concave portion 3 is formed on the inner surface near the joining end face 2 of the segment 1.1 to be joined.
And a flange portion 4 between the recess 3 and the joint end face 2.
The fitting metal fitting 5 is buried. The fitting metal fitting 5 is buried in a surface on the side of the joining end face 2 forming the recess 3 of the segment 1 substantially in parallel with the joining end face 2, and has a rectangular bearing having a sheath tube insertion hole 6 a opened in the center. It is composed of a plate 6 and a sheath tube 7 inserted and fixed in a sheath tube insertion hole 6a of the support plate 6 so as to extend between the support plate 6 and the joint end surface 2. At the same time, the joint pipes 2 are joined together, and the sheath pipes 7 of both fittings are connected at the same time.
A bolt 8 is passed through the sheath tube 7 of the above, and a nut 10 is fastened to both ends of the bolt 8 via a washer 9.

[Problem to be Solved by the Invention] By the way, the joint fitting 5 mainly receives the fastening force from the nut 10 by the supporting plate 6 and applies the force to the flange portion 4.
And has a function of preventing damage to the flange portion 4 such as cracks, and the larger the pressure receiving area, the better.

However, there is a limit in increasing the pressure receiving area, that is, the size itself, of the support plate 6, and in some cases, the above function cannot be sufficiently performed.

The present invention has been made in view of such circumstances, and provides a fitting for a concrete segment joint in which the fastening force from the nut described above is sufficiently dispersed in the segments to improve the joining strength. It is an object.

Means for Solving the Problems The present invention has been made to achieve the above object, and has a joint end face formed on a joint end face side of a recess formed in an inner surface near a joint end face of a concrete segment. When a bolt for joining concrete segments is inserted, and a nut is screwed into the bolt and tightened, the supporting plate receives a fastening force from the nut. By arranging a reinforcing bar longer than the supporting plate so as to cross the supporting plate and integrating the reinforcing bar, and arranging the reinforcing bar in a flange portion provided between the recess and the joint end surface, the supporting plate is Is transmitted and dispersed to the flange portion via the reinforcing bar.

[Action] According to the joint fitting of the concrete segment of the present invention, since the reinforcing bar receives the fastening force of the nut by the reinforcing bar in addition to the supporting plate and the reinforcing bar supports the entire supporting plate, the fastening force received by the supporting plate is reduced. By transmitting and dispersing to the flange portion via the reinforcing bar, the force is sufficiently distributed to the segments, and the reinforcing bar serves as a stopper to improve the joining strength between the concrete segments. In addition, since the reinforcing bar is simply fixed to the bearing plate, it can be manufactured easily and at low cost.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. In these figures, the same components as those in FIGS. 5 and 6 are denoted by the same reference numerals, and description thereof will be omitted.

Reference numeral 11 in FIG. 1 indicates the entirety of the fitting for this embodiment.

The joint fitting 11 includes the bearing plate 6 and the sheath tube 7.
Of the bearing plate 6 in the joint fitting 5 comprising:
A plurality of (in this case, two) reinforcing bars 12 having a circular cross section are welded in parallel with the bearing plate 6 to the surface of the segment 1 on the side of the joining end surface 2.

These reinforcing bars 12 have a length of about three times the lateral length of the bearing plate 6, and extend in the longitudinal direction of the joint end face 2 with the sheath tube 7 interposed therebetween. By aligning the center with the sheath tube 7, the length of the portion protruding laterally from the supporting plate 6 is the same.

As shown in FIGS. 2 and 3, the fitting metal fitting 11 has a bearing plate 6 parallel to the joint end face 2 facing the concave portion 3 on the flange portion 4 of the segment 1, and a distal end of the sheath tube 7 having a distal end. The reinforcing bar 12 is buried in the segment 1 so as to be exposed at the joint end surface 2 and to be immersed in the flange portion 4.

In the same manner as in the prior art, the two jointed end faces 2 of the segment 1 are aligned with each other, and at the same time, the two sheathed tubes 7, 7 are connected to each other. Pass bolt 8 through 7.7
The segments 1 are joined to each other by tightening the nuts 10 at both ends through washers 9.

According to the joint fitting 11 of the present embodiment, in addition to the bearing plate 6, the rebar 12 also receives the fastening force of the nut 10 and receives the rebar.
Since the supporting plate 12 supports the entire supporting plate 6, the fastening force received by the supporting plate 6 is transmitted and dispersed to the flange portion 4 via the reinforcing bar 12, so that the force is sufficiently dispersed to the flange portion 4. The reinforcing strength of the reinforcing bars 12 serves to prevent slippage, thereby improving the joining strength between the segments 1. In addition, since it can be constituted only by welding the reinforcing bar 12 to the supporting plate 6, it can be manufactured easily and at low cost. Further, the reinforcing bar 12 can also function as a structural material of the segment 1. In this case, it is effective to appropriately bend both ends of the reinforcing bar 12.

FIG. 4 shows another embodiment of the present invention. This joint fitting 20 has two rebars 21 perpendicular to the rebar 12 on the joint end face 2 side of the rebar 12 in the joint fitting 11. It is welded, so to speak, the reinforcing plates 12 and 21
Are welded together. According to the joint fitting 20, it is expected that the joint strength is further improved than the joint fitting 11. In this case, it is desired that the reinforcing bars 12 and 21 be arranged in a well-balanced manner so that the reinforcing bars 12 and 21 receive the fastening force from the nut 10 evenly.

In each of the above embodiments, the reinforcing bar 12 has a circular cross section, but may have an irregular cross section and may be fixed to any number of the supporting plates 6. Furthermore, if the reinforcing bar 12 that is directly fixed to the support plate 6 and distributes the fastening force received by the support plate 6 to the flange portion 4 is integrated with the support plate 6, the recess of the support plate 6 can be formed. The reinforcing bar 12 (21) is provided on the supporting plate 6 by welding to the outer surface on the site side or the other surface, passing through the inside of the supporting plate 6, or casting integrally with the supporting plate 6. Is also good.

[Effects of the Invention] As described above, according to the joint fitting for a concrete segment of the present invention, the joint surface of the concrete segment is substantially parallel to the inner surface of the concave portion formed on the inner surface near the joint end surface. When a bolt for joining concrete segments is inserted, and a nut is screwed into the bolt and tightened, the supporting plate receives a fastening force from the nut. By arranging a longer reinforcing bar across the supporting plate and integrating the reinforcing bar, and by arranging the reinforcing bar in a flange portion provided between the recess and the joint end surface, the fastening received by the supporting plate is achieved. Since the force is transmitted and dispersed to the flange portion via the reinforcing bar, the reinforcing bar supports the entire support plate and The fastening force of the car nut is sufficiently dispersed to the flange portion via the reinforcing bar, and as a result, the joint strength between the concrete segments is improved, and also, since the reinforcing bar is merely fixed to the bearing plate, In addition, there is an effect that it can be manufactured at low cost.

[Brief description of the drawings]

FIG. 1 is a perspective view of an embodiment of the fitting for the present invention, FIG.
FIG. 3 is a front view showing a state in which the fitting is buried in the vicinity of the joining end face in the circumferential direction of the segment. FIG. 3 is a side sectional view thereof. FIG. 4 is a perspective view of another embodiment of the present invention. The figure is a front view in which a conventional fitting is buried in the vicinity of the joining end face in the circumferential direction of the segment, and FIG. 6 is a side sectional view thereof. 1 ... concrete segment, 2 ... joint end face, 3 ...
... recess, 4 ... flange, 6 ... bearing plate, 8 ...
... Joint bolts, 10 ... Nuts, 11,20 ... Fittings for joints, 12, 21 ... Rebar.

Claims (1)

(57) [Scope of request for utility model registration] 1. A joint bolt for joining concrete segments is provided on an inner surface on a joint end surface side of a recess formed on an inner surface near a joint end surface of a concrete segment in a state substantially parallel to the joint end surface. When a nut is screwed into the bolt and tightened, a reinforcing bar longer than the supporting plate is arranged on the supporting plate receiving the fastening force from the nut so as to cross the supporting plate and integrated. By arranging the reinforcing bar in a flange portion provided between the recess and the joint end face, the fastening force received by the bearing plate is transmitted and dispersed to the flange portion via the reinforcing bar. Metal fittings for concrete segments to be used.