JPS643893Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a lined pipe in which a reinforcing plate with a structure for anchoring the lining is embedded in the lining provided on the inner peripheral surface of the pipe, and in particular, the reinforcing plate has a mechanical strength. It has a structure that does not deteriorate.

The cross-sectional structure of a conventional lining pipe is shown in FIG. As shown in the figure, the lining pipe 1 is lined with a lining 3 made of synthetic resin or the like as an insulating material on the inner peripheral surface of the conduit 2.
A reinforcing plate 4 having a plurality of locking structures 5 on the circumference for locking the lining is fixed to the inner peripheral surface of the conduit 2 at multiple locations by welding or the like, and is embedded in the lining 3 by molding. ing. This reinforcing plate 4 is provided to prevent a gap from occurring between the conduit 2 and the lining 3 due to heat shrinkage during molding, or to prevent the lining 3 from peeling off due to negative pressure in the conduit. There is.

Further, as the locking structure 5 provided on the reinforcing plate 4, those shown in FIGS. 2 to 7, for example, are generally adopted. FIGS. 2 and 3 show protrusions 5a and 5b with holes formed by partially cutting the base material of the reinforcing plate 4, and FIG. 4 shows protrusions 5c with protrusions on the periphery. shows. Further, FIG. 5 shows a structure 5d in which a convex portion of the reinforcing plate 4 formed into a corrugated shape has a hole, and FIGS. shows. Furthermore, FIG. 7 shows a locking member 5f formed into a corrugated shape and used by being fixed to the reinforcing plate 4. Conventionally, in order to provide such a locking structure 5 on the reinforcing plate 4, for example, a second
In the case of the holed projection 5a as shown in the figure, it was provided by cutting a part of the reinforcing plate 4 along the axial direction of the conduit 2 as shown in FIG. Therefore, the buckling strength of the reinforcing plate 4 in the circumferential direction naturally decreases.

Incidentally, the reinforcing plate 4 buried within the lining 3
After the lining treatment by molding, a considerably large stress is applied due to thermal contraction of the lining, so it is necessary to considerably increase the rigidity of the reinforcing plate 4.

Therefore, in order to increase the rigidity of the reinforcing plate, it is possible to increase the thickness of the reinforcing plate, but when the thickness of the reinforcing plate is increased, the lining layer also becomes thicker, and as a result, the inner diameter of the lining material becomes smaller and the structure deteriorates. This is disadvantageous in terms of design. Further, in order to increase the rigidity, a larger number of locations on the inner circumferential surface of the conduit can be fixed by welding or the like, but this results in poor workability and increases manufacturing costs.

In view of the above-mentioned prior art, it is an object of the present invention to provide a lined pipe in which a reinforcing plate having a locking structure embedded in the lining has a structure in which sufficient rigidity can be obtained even with a minimum plate thickness. The structure of the present invention that achieves this purpose includes a lining material lined by molding on the inner circumferential surface of the conduit, a bridge-shaped protrusion that engages with the lining material, and a hole formed by the formation of the protrusion. and a reinforcing plate made of a cylindrical metal plate on which engaging parts are punched out by a press, and the holes are arranged so as to face the axial direction of the conduit. It is.

An embodiment of the present invention will be described in detail below with reference to the drawings. In this example, a case will be described in which the reinforcing plate is equipped with the locking structure shown in FIG. 2, and the same parts as in the conventional example are given the same numbers.
Duplicate explanations will be omitted.

In the lining pipe of this embodiment, the locking structure 5 provided on the reinforcing plate 6 buried in the lining 3 is
This is provided so as not to reduce the buckling deformation strength of the reinforcing plate 6 in the circumferential direction. In other words, when the locking structure 5 is formed by cutting a part of the reinforcing plate 6 by press working, such as the protrusion with a hole 5a shown in FIG. 2, the periphery of the reinforcing plate 6 is A protrusion 5a with a hole is provided by cutting along the direction. That is,
The holed projection 5a is provided on the reinforcing plate 6 so that the hole of the holed projection 5a faces in the axial direction of the conduit 2. Therefore, unlike the prior art shown in FIG. 8, the circumferential strength of the reinforcing plate 4 is not weakened by the cut portions, that is, the hole portions, and the holed protrusions 5a exhibit the effect of ribs, so that the reinforcing The strength of the plate 6 before press working can be maintained. Therefore, lining 3
Even if the reinforcing plate 6 is embedded therein, the buckling deformation strength in the circumferential direction does not decrease. As a result, it is possible to prevent a portion of the reinforcing plate 6 from sinking inward of the pipe, and the thickness of the reinforcing plate 6 can be made thinner than in the past. Furthermore, if a reinforcing tube is formed into a cylindrical shape using such a reinforcing plate 6, even if the thickness of the reinforcing plate is about 0.8 mm, the reinforcing tube will not be fixed to the conduit 2 by spot welding, etc. By simply inserting and burying it in the lining 3, sufficient buckling strength in the circumferential direction can be obtained.

As described above in detail with reference to the embodiments, according to the present invention, the locking structure for locking the lining is oriented in a direction that does not reduce the buckling deformation strength in the circumferential direction of the reinforcing plate buried in the lining. By providing the reinforcing plate, it is possible to give the reinforcing plate maximum rigidity even with the minimum thickness, which allows the plate to be thinner than conventional reinforcing plates, reducing material costs. This saves money and is advantageous in terms of structural design.

[Brief explanation of drawings]

Figures 1 to 8 relate to the prior art, with Figure 1 being a longitudinal sectional view of a lining pipe, Figures 2 and 3 being perspective views of a reinforcing plate with projections with holes, and Figure 4 with projections. FIG. 5 is a perspective view of a reinforcing plate formed into a corrugated shape; FIG. 6a is a perspective view of a reinforcing plate having holes with openings having different diameters. , Fig. 6b is a sectional view thereof, Fig. 7 is a perspective view of a reinforcing plate to which a corrugated reinforcing member is fixed, and Fig. 8 is a reinforcing plate equipped with a protrusion with a hole embedded in the lining. FIG. 9 is a perspective view showing an embodiment of the present invention. In the drawing, 2 is a conduit, 3 is a lining, 5,5
a, 5b, 5c, 5e, and 5f are locking structures, and 6 is a reinforcing plate.

Claims (1)

[Scope of utility model registration request] An engagement part formed by pressing out a lining material lined by molding on the inner circumferential surface of a conduit, a bridge-shaped convex part that engages with this lining material, and a hole created by the formation of this convex part. 1. A reinforcing plate made of a cylindrical metal plate having a cylindrical shape formed therein, the holes being arranged so as to face the axial direction of the conduit.