JPS6349798B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present application relates to a concrete pipe constructed from several arcuate concrete segments.

The concrete ring used in the propulsion method generally uses a Huyum pipe, but since the Huyum pipe itself is a single piece, it is difficult to withstand the pressure applied during propulsion.
Although there is no particular problem, when assembling a ring (cylindrical body) with concrete segments and using it, since the ring (cylindrical body) is divided, deflection due to its own weight is unavoidable.

Therefore, the concrete ring of the present application is designed so that the outer circumferential side surface or the inner circumferential side surface of a concrete segment having an arcuate cross section is flush with the outer circumferential surface of the flat steel that is directly connected to the main reinforcing bar placed inside the segment. , in a cylindrical body composed of several segments with flat steel embedded, the cross section T interposed between the cylindrical bodies
It is constructed by welding the flat steel and a connecting steel plate provided on the thick surface of the concrete segment in the circumferential direction to a shaped iron collar.

The iron collar with a T-shaped cross section is welded to the flat steel buried on the outer or inner side, as well as to the connecting steel plate provided on the thick circumferential surface, so welding between the inside and outside of the ring is not possible. This increases the rigidity of the ring and improves its stability.

One embodiment will now be described with reference to the drawings.

As shown in FIGS. 1 and 2, a flat steel 1 is buried in the outer circumferential side surface 12 of a concrete segment S so as to be flush with the circumferential surface. The flat steel 1 is directly connected to the main reinforcement 5 of the concrete segment S. A connecting steel plate 3 with a vault through hole 4 drilled in the center is attached to the concrete segment thick side 13 so that one side of the steel plate 3 is flush with the segment thick side 13, and one lower side of the steel plate 3 is made of concrete. Each segment is buried so as to be slightly set back from the inner circumferential side surface 14 to ensure a welding allowance 15. Flat steel 1 buried in the outer peripheral side surface 12 of the concrete segment S
There are several. Also, as shown in Fig. 5, the flat steel strip 1'
may be buried consecutively. Assemble the segments shown in Figure 1 into a ring shape Figure 4 A, B, C, D
An iron collar 2 or 2' having a T-shaped cross section as shown in the figure is interposed between the rings O and P to connect the rings to each other. As shown in FIG. 3 and FIG.
and the iron collar 2 are connected by welding 6,
Secure the connection between rings O and P. Outer peripheral side 12
At the same time as shown in FIG. It is possible to securely fix the space between O and P from both the outer circumferential surface and the inner circumferential surface, thereby increasing the rigidity and stability of the ring. In this case, the connecting steel plate 3 has a vault through hole 4 drilled in the center and is connected with a bolt nut 8, so an iron collar 2 that can drill a long hole 16 in FIGS. 4A and B is used.
Use. In FIG. 7, only the connecting steel plates 3 are buried in the segment circumferential thick surface 13, and the connecting steel plates 3 are not directly connected to each other, so the iron collar 2' in FIGS. 4C and D is Use. Similarly, flat steel 1 and connecting steel plate 3 are attached to iron collar 2'.
Both are fixed with welds 6 and 7. Figure 8 shows
The iron collar 2' is welded 6 from the inner circumferential side of the ring, and the connecting steel plate 3 is welded 7 at the outer circumferential side.
We aim to Furthermore, in FIGS. 9A and 9B, a convex portion 18 is provided on the iron collar 17 to allow for misalignment between the rings. The connection on the thickness side of the segment S in the width direction can be made using a connecting steel plate or as shown in FIG.
1 and secure it.

As described above, the concrete ring of the present invention is made of concrete segments that have increased rigidity so that it can be propelled in a stable state, and since it is made of segments, it can be transported by stacking them at once, making it convenient for transportation. This has the advantage of ensuring reliable connections to both points and tunnels.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a concrete segment constituting the concrete ring of the present application. Figure 2 is a sectional view of the same. FIGS. 3 and 5 are perspective views showing how rings assembled using concrete segments are connected to each other. Figure 4 A, B, C, D and Figure 9 A, B are as follows:
A sectional view and a front view showing an iron collar with a T-shaped cross section. FIG. 6, FIG. 7, and FIG. 8 are sectional views showing how the rings are connected to each other. 1...Flat steel, 1'...Band flat steel, 2, 2', 17...Iron collar, 3...Flat steel for connection, 4...Vault through hole,
5... Main reinforcing bar, 6, 7... Welding point, 8... Bolt nut, 9... Notch recess, 10... Recess, 11... Convex part, 12... Outer peripheral side, 13... Circumferential thickness surface, 1
4... Inner peripheral side surface, 15... Welding allowance, 16... Long hole, 18
...Protrusion.

Claims (1)

[Claims] 1. A flat bar is buried in the outer or inner circumferential side of a concrete segment having an arcuate cross-section so that the circumferential surface and the outer surface of the flat bar directly connected to the main reinforcing bars arranged within the segment are flush with each other. In a cylindrical body composed of several segments, the flat steel and the connecting steel plate provided on the thick surface of the concrete segment in the circumferential direction are connected to an iron collar with a T-shaped cross section interposed between the cylindrical bodies. A concrete ring characterized by being welded.