JP7429965B2 - protection plate - Google Patents

Description

The present invention relates to a protection plate for protecting buried materials buried underground.

In recent years, in order to improve the appearance of towns and prevent accidents caused by sagging power lines during disasters, there has been a nationwide push to eliminate utility poles by burying power lines underground. In addition to electric wires, information and communication cables and gas pipes are also buried underground. These buried materials are generally buried relatively shallowly from the ground in order to reduce the cost and construction period of the burial work.

Therefore, as shown in Fig. 6, for example, when digging up the ground for road construction, there are accidents in which buried material L is accidentally cut by asphalt cutter A, and accidents in which buried material L is mistakenly dug up by backhoe B. may occur. Therefore, by laying a protection plate P made of ceramics, steel plate, etc. above these buried materials L, the buried materials L are protected from the above-mentioned accidents (see, for example, Patent Document 1). Generally, a plurality of such protection plates P are laid in a row along the buried material L.

Utility model registration No. 3164718

However, in the above-mentioned protection plates, since a plurality of protection plates are simply laid adjacent to each other, each protection plate is likely to be misaligned. Therefore, for example, when the asphalt cutter A comes into contact with a protection plate, the protection plate moves and there is a gap between adjacent protection plates, and there is a possibility that the buried material L cannot be properly protected.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a protection plate that is difficult to shift when a plurality of protection plates are installed adjacent to each other.

The present invention includes a main body, a semicircular protrusion protruding outward from one of the main body parts, and an invaginated part corresponding to the protrusion on the other of the main body. , when a plurality of protection plates are installed such that the protrusion of another protection plate fits into the recessed part of one protection plate, the protrusion It has an engaging pawl that engages with a recessed portion of the plate, and the recessed portion has an engaging groove that the engaging pawl engages with.

According to the present invention, adjacent protection plates are connected to each other by engaging the engagement claw with the engagement groove, so even if force is applied to one protection plate, movement is restricted by the adjacent protection plate. Therefore, displacement of the protection plate can be suppressed.

(a) is a perspective view of a protection plate according to an embodiment of the present invention viewed from above, (b) is a perspective view of the same protection plate viewed from below, (c) is (b) A perspective view when viewed from below, which is different from the above. (a) is a top view of the protection plate, and (b) is a sectional view taken along line II in (a). (a) is a top view of the two protection plates connected to each other, and (b) is a sectional view taken along the line II-II in (a). FIG. 3 is a cross-sectional view showing the operation when connecting one protection plate to another protection plate. The top view which shows the state where the relative angle of each protection plate is adjusted in the several said protection plate mutually connected. A diagram showing an accident in which buried material was cut by an asphalt cutter and an accident in which buried material was dug up by a backhoe.

A protection plate according to an embodiment of the present invention will be described with reference to FIGS. 1 to 5. This protective plate is installed above underground materials such as electric wires, information communication cables, gas pipes, etc., and is used to prevent accidents such as cutting of buried materials by asphalt cutters and backhoes during road construction. This is to prevent digging accidents.

As shown in FIGS. 1(a) to (c) and FIGS. 2(a) and 2(b), the protection plate 1 is formed into a flat plate shape as a whole, and is laid so that the lower surface 11 faces the buried material. . In plan view, the protection plate 1 includes a main body 2, a semicircular protrusion 3 protruding outward from one side of the main body 2, and an arc-shaped protrusion 3 corresponding to the protrusion 3 on the other side of the main body 2. An invaginated part 4 is provided. The outer circumferential edge 41 of the invaginated part 4 is configured to have the same curvature as the outer circumferential edge 31 of the protruding part 3, and when it is translated in parallel along the protruding direction of the protruding part 3 (hereinafter referred to as the X direction), the outer circumferential edge 31 and Overlap. The main body portion 2 has a pair of sides 21 and 22 extending along the X direction.

The protection plate 1 also includes a hollowed-out portion 5 recessed on the upper surface 12 side of the main body portion 2 and the protrusion portion 3 . By providing such a hollowed-out portion 5, it is possible to reduce the weight of the protection plate 1 and to reduce the cost of materials by reducing the cost. The hollowed out portion 5 is divided into a plurality of regions by reinforcing portions 51 extending along the X direction, and in the illustrated example, one reinforcing portion 51 provided at the center of the main body portion 2 and the protruding portion 3 separates two separated by areas. By providing such a reinforcing portion 51, it is possible to reduce the weight and cost of the protective plate 1 due to the hollowed out portion 5, while suppressing a decrease in the strength of the protective plate 1.

The hollowed out part 5 is provided with through holes 52 that penetrate from the upper surface 12 side to the lower surface 11 side, and in the illustrated example, there are two through holes 52 located directly below both ends of the reinforcing part 51 in the X direction, and two through holes perpendicular to the X direction. Elongated through holes 52 are provided at a total of four locations, one each directly below both ends of the invaginated portion 4 in the Y direction (see FIG. 2(a)). By providing such a through hole 52, even if rainwater or the like accumulates in the hollowed out portion 5 of the protection plate 1 buried underground, it can be drained from the through hole 52.

As shown in FIGS. 3(a) and 3(b), in the protection plate 1, the outer circumferential edge 41 of the recessed part 4 is formed in an arc shape having the same curvature as the outer circumferential edge 31 of the protruding part 3. When the protruding part 3 of another protection plate 1b fits into the recessed part 4 of the plate 1a, the protruding part 3 and the recessed part 4 fit into each other exactly. The protruding portion 3 has an engaging claw 32 that engages with the recessed portion 4 of the adjacent protection plate 1, and the recessed portion 4 has an engaging groove 42 that engages with the engaging claw 32 (Fig. (see also (c)).

The engagement claw 32 has a base end 33 that is continuous with the lower surface 11 side of the protrusion 3 and protrudes outward from the center of the outer peripheral edge 31, and a base end 33 that is bent upward from the outer end of the base end 33. (See also FIG. 1(a)). The engagement groove 42 includes an arc-shaped groove 43 dug along the outer peripheral edge 41 on the lower surface 11 side of the recessed part 4, and a groove 43 extending downward on the outer peripheral edge 41 side of the groove 43. (See also FIGS. 1(b) and 1(c)). The lower end portion 45 of the convex edge 44 is formed by a downwardly convex curved surface (see FIG. 3(b)).

Further, the protruding part 3 has an arc-shaped dug part 35 formed by digging along the outer peripheral edge 31 on the lower surface 11 side of the protruding part 3, and the indented part 4 has both ends of the inverted part 4 in the Y direction. It has a pair of support pieces 46 provided so as to form a continuous surface with the lower surface 11 at the lower surface 11 (see also FIG. 1(b)). The pair of support pieces 46 extend inward so as to face each other, and when the protrusion 3 of the other protection plate 1b fits into the recess 4 of one protection plate 1a, the depression 35 is supported from the lower surface 11 side.

The protection plate 1 is made of high-hardness alloy iron (for example, white cast iron with a Brinell hardness of 450 HBW or more) that has a hardness three times or more that of a steel plate. Thereby, the protection plate 1 has sufficient cutting resistance against an asphalt cutter. Further, the protection plate 1 is formed to have, for example, a length of 450 mm in the X direction, a length of 300 mm in the Y direction, a thickness of 40 mm, and a weight of about 15 kg. With such a size and weight, the protective plate 1 can be carried and laid by a single worker.

The protective plate 1 does not need to be made entirely of white cast iron, as long as at least its surface layer (for example, a layer with a thickness of 5 to 15 mm from the surface) is made of white cast iron. A method for forming the surface layer with white cast iron includes, for example, pouring molten iron into a mold shaped like the protective plate 1 and rapidly cooling it. In addition, if about 10 mm of the surface layer is made of white cast iron, the above-mentioned strength can be ensured as the protective plate 1, and the necessary effect of cutting resistance can be obtained.

As shown in FIG. 4, in order to connect one protection plate 1a to another protection plate 1b, the tip 34 of the engaging claw 32 of the protection plate 1b passes through the convex edge 44 of the protection plate 1a and enters the groove 43. The protruding part 3 of the protective plate 1b is made to approach the recessed part 4 of the protective plate 1a from diagonally above so as to be inserted thereinto. At this time, since the lower end 45 of the convex edge 44 is formed of a curved surface and the tip 34 of the engaging claw 32 is formed to be bent upward, the tip 34 can be smoothly inserted into the groove 43. can. When the protective plate 1b is made parallel to the protective plate 1a, the tip 34 enters the groove 43 and is caught on the convex edge 44, thereby connecting the protective plates 1a and 1b to each other. Moreover, at this time, the support piece 46 of the protection plate 1a supports the dug-out part 35 of the protection plate 1b from the lower surface 11 side (refer FIG.3(b)). In this way, the protection plates 1a and 1b can be connected with one touch without any tools.

According to the above configuration, when a plurality of protection plates 1 are laid adjacent to each other, one protection plate 1 and another protection plate 1 are connected to each other by engagement between the engagement claws 32 and the engagement grooves 42. be done. Therefore, even if an asphalt cutter or backhoe excavator comes into contact with one protection plate 1 during road construction, one protection plate 1 will be tied to the other protection plates 1 and its movement will be restricted. Therefore, positional deviation can be suppressed.

Specifically, for example, when one protection plate 1b is pressed down from above by an asphalt cutter (see FIG. 3(b)), the support piece 46 of the adjacent protection plate 1a cuts out the pressed protection plate 1b. Since the recessed portion 35 is supported from the lower surface 11 side, the downward movement of the protection plate 1b is restricted, and the adjacent protection plates 1a and 1b are held parallel to each other.

Furthermore, when one protection plate 1b is lifted by a shovel of a backhoe, the engagement claw 32 of that protection plate 1b engages with the engagement groove 42 of the adjacent protection plate 1a, so that the protection plate 1b upward movement is restricted, and adjacent protection plates 1a and 1b are held parallel to each other. In addition, the adjacent protection plates 1a and 1b are connected with the protruding portion 3 and the invaginated portion 4 meshing with each other, and the connecting boundary between them is not a straight line but an arc shape. It is possible to block the teeth of an asphalt cutter that performs cutting (see Fig. 5).

Further, as shown in FIG. 5, the outer circumferential edge 31 of the protruding portion 3 and the outer circumferential edge 41 of the invaginated portion 4 are formed to have the same curvature, and an arc-shaped engagement is provided along the outer circumferential edge 41. Since the engagement claw 32 is engaged with the engagement groove 42, the relative angle θ of the other protection plate 1b with respect to the one protection plate 1a is set within the range in which the engagement claw 32 is engaged with the engagement groove 42. , for example, within a range of ±30°. By adjusting the relative angle of each protection plate 1 using such a flexible connection structure, even if the buried material is laid in a curved line, multiple protection plates can be installed along the buried material. Board 1 can be laid down.

Note that the protection plate according to the present invention is not limited to the above-mentioned embodiments, and can be modified in various ways. For example, the protection plate may have a configuration that does not include the dug portion and the support piece. Further, the protection plate does not necessarily have to have a hollowed out portion.

1, 1a, 1b Protective plate 11 Lower surface 2 Main body part 3 Projection part 32 Engagement claw 31 Outer periphery of the projection part 33 Base end of engagement claw 34 Tip of engagement claw 35 Digging part 4 Invagination part 42 Engagement groove 46 Pair of support pieces 5 Lightening part 51 Reinforcement part 52 Through hole X Projection direction of the projection part

Claims (6)

A main body part, a semicircular protrusion protruding outward from one of the main body parts, and an invaginated part in an arc shape corresponding to the protrusion part on the other side of the main body part. A protective plate,
When a plurality of protection plates are installed such that the protrusion part of another protection plate fits into the recessed part of one protection plate,
The protruding portion has an engaging claw that engages with an invaginated portion of an adjacent protection plate,
The protection plate, wherein the recessed portion has an engagement groove in which the engagement claw engages. The engagement claw is formed in a shape that protrudes so as to be continuous with the lower surface side of the protrusion on the proximal end side and is bent upward on the distal end side,
The protection plate according to claim 1, wherein the engagement groove is formed by digging into the lower surface side of the recessed portion. The protrusion has a recess formed along the outer periphery on the lower surface side of the protrusion,
The recessed portion has a pair of support pieces extending inward so as to form continuous surfaces with the lower surface at both ends of the recessed portion,
3. The protection plate according to claim 1, wherein the support piece of one protection plate supports the dug portion of another adjacent protection plate. The protection plate according to any one of claims 1 to 3, further comprising a hollowed-out portion recessed on the upper surface side of the main body portion and the protruding portion. 5. The protection plate according to claim 4, wherein the hollowed out portion is separated into a plurality of regions by a reinforcing portion extending along the protrusion direction of the protrusion. 6. The protection plate according to claim 4, wherein the hollowed out portion is provided with a through hole penetrating from the upper surface side to the lower surface side.

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