JP4351077B2 - Underground object protection plate - Google Patents

Description

  The present invention relates to a protective plate that protects cables and pipes buried in the ground from damage or cutting caused by work from the ground, and is particularly advantageous for shallow pipes buried near the ground surface. The present invention relates to an underground buried object protection plate excellent in difficult cutting performance and impact resistance performance.

  Conventionally, various pipes such as water pipes and gas pipes are buried in the ground, but with the recent development of information and communication networks, information and communication lines such as metal cables and optical fibers are underground. The movement of burying has been increasing year by year, and signal cables and power lines such as compact cable boxes (hereinafter referred to as C.C.BOX), information boxes, telephones, etc. have been buried under the road. I came. However, when such information cables are buried in the ground, if there are places where water pipes or gas pipes are buried, it is necessary to bury them while avoiding collision with those buried objects. For this reason, the depth of embedment of information communication lines is inevitably reduced.

  And in the case of shallow pipes buried in such shallow pipes, in order to remove asphalt and concrete on the road pavement when repairing roads on those pipes, etc. In addition, work such as cutting the road surface with a concrete cutter or crushing the road surface with a crushing breaker is performed, but at that time, the pipe of the information and communication cable buried in the ground by mistake is used. There was a problem of cutting or breaking along with the road surface.

  Therefore, in order to prevent accidents such as cutting and breakage of information and communication cables that occur during such road construction, cover those pipes with plates made of hard steel or other materials. Therefore, various protection plates for protecting the pipeline from concrete cutters and breakers entering from the ground have been proposed.

  For example, in Japanese Patent Laid-Open No. 6-209516 (Patent Document 1), ceramics mainly composed of titanium boride are formed in a plate shape or a cylindrical shape, and these are disposed on the upper surface or the peripheral surface of an embedded cable. Thus, a protection plate for an embedded cable that protects a cable embedded in the ground has been clarified. Further, in Japanese Patent Laid-Open No. 10-9478 (Patent Document 2), a protector made of hard plastics, steel, ceramics or the like is formed to bend downward with respect to the traveling direction of the road surface cutting cutter. Underground object protectors are shown.

  Furthermore, Japanese Patent Application Laid-Open No. 11-201324 (Patent Document 3) discloses a relatively soft plate-like base steel plate, and an elongated shape that is made of the same material as that of the base steel plate and is combined in the same shape as the base steel plate. An underground buried object protection plate with a structure in which strip-shaped block steel plates are superposed has been clarified. On the other hand, in Japanese Patent Application Laid-Open No. 2002-325346 (Patent Document 4), inside a plate-shaped, half-cylinder, or cylindrical-shaped protective material made of a fire-resistant and heat-resistant castable material mainly composed of aluminum oxide. Disclosed is a buried cable protection member that protects power distribution cables and communication cables buried in the ground from damage caused by cutting, erosion, fire, etc. by dispersing minerals with high hardness such as zircon sand as aggregate. Has been.

  However, in the case of such a protective plate, for example, if the material is formed of ceramics, it exhibits sufficient strength against cutting with a concrete cutter, but on the other hand, it has an impact. The problem is that the protection plate may be easily damaged due to impact caused by dropping during construction, the breaker for crushing concrete used during pavement construction, etc., and the production cost is too high. Was inherent.

  In addition, in a protective plate formed of a material such as a steel plate, the portion where the protective plates are connected to each other is simply abutted between the protective plates in the conventional one. The cutter can easily penetrate deeper into the ground than the protective plate, and the pipes buried under the protective plate can be cut off. Moreover, because the cutting ability of the cutter has improved dramatically due to the technological advancement of diamond blades used in concrete cutters, it can be easily cut with a conventional steel plate protection plate, and sufficient protection of the buried pipe line The problem of not being able to do was caused.

JP-A-6-209516 Japanese Patent Laid-Open No. 10-9478 Japanese Patent Laid-Open No. 11-201324 JP 2002-325346 A

  Here, the present invention has been made in the background of such circumstances, and the problem to be solved is protection provided on a buried object such as a cable or a pipe buried in the ground. Providing an underground buried object protection plate with excellent workability as well as enhancing the hard cutting performance and impact resistance performance of the plate to protect the pipes buried under the protection plate more firmly. It is in.

  And, in the present invention, in order to solve such a problem, the damage is caused by the work placed from the ground on the buried object such as a cable or a pipe buried in the ground. Formed in a form in which a plate is made of a hard material that protects from the surface, and the surface of the plate has a large number of protrusions having an outer surface whose top surface is conical or curved. An underground buried object protection plate characterized in that the tip of a working machine that is allowed to invade into the ground from the ground is configured to be able to escape to the side by its outer surface shape when contacting the projection, It is a summary.

  According to one of the desirable embodiments of the underground buried object protection plate according to the present invention, the projection is formed with a predetermined thickness in a spherical shape or an elliptical spherical shape, and is another desirable. According to one aspect, the protrusions are arranged on the plate surface in a staggered arrangement.

  Further, according to one of the other desirable embodiments of the underground buried object protection plate according to the present invention, the protection plate is configured in a rectangular shape, and two adjacent sides of the rectangular shape are respectively While a groove that opens upward in the direction in which the side portion extends is formed, on the other two adjacent side portions of the rectangular shape, a downward protrusion that can engage with the groove on the corresponding side portion, respectively. Are formed in the direction in which the side portions extend, and the two protective plates can be connected to each other by the concave and convex fitting of the grooves and the protrusions.

  In addition, according to one of the other desirable embodiments of the underground buried object protection plate according to the present invention, the protection plate is made of alloy white cast iron in which spherical vanadium carbide is finely dispersed in a martensite structure. It is characterized by the fact that it is made of a material, and when such a material is adopted, the plate-like portion located between the multiple projections is configured to have a plate thickness of at least 15 mm. It will be.

  As described above, in the underground buried object protection plate according to the present invention, the plate surface is formed in a form in which a large number of protrusions having an outer surface having at least a top surface of a cone shape or a curved surface shape are projected. When the tip of a work machine that is approached from the ground, such as a blade of a concrete cutter, comes into contact with the projection, it escapes to the side, and the stress applied from the top of the projection is applied to the outer surface of the projection. Due to the inclination, the axial force and the circumferential direction of the protrusion are dispersed, in other words, the downward force applied to cut the protective plate applied from the upper part of the protective plate is dispersed in the downward direction and the lateral direction, respectively. Can be effectively reduced. As a result, the fear that the protective plate may be cut by a concrete cutter or the like can be effectively avoided.

  In one of the above-described desirable embodiments of the underground buried object protection plate according to the present invention, the projections formed on the protection plate have a spherical shape or an elliptical spherical shape. Regardless of the angle at which the front end of the work machine contacts the side surface, it is possible to effectively disperse the stress for cutting the protective plate applied from the work machine. Since the spherical or elliptical spherical projection is formed with a predetermined thickness, it is possible to reduce the weight of the projection as compared with the case where the entire projection is solid. It is also possible to reduce the weight.

  Further, according to one of the other desirable aspects of the present invention, since the projections are arranged in a staggered arrangement on the plate surface, the tip of the machine tool is positioned with respect to the protection plate. Even if it penetrates from an angle, it becomes possible to make sure that the tip of the machine tool and a large number of protrusions arranged on the protective plate come into contact with each other, and the stress to cut the protective plate is effectively dispersed. Will get.

  Furthermore, in the above-mentioned other desirable aspect of the underground buried object protection plate according to the present invention, the shape is formed in a rectangular shape, and the two sides of the rectangular shape are opposed to each other. Each has a groove on one side and a ridge on the other side, so that a plurality of protection plates are connected to the grooves on one protection plate and the other protection plate. It can be easily connected just by fitting the ridges, and can be combined with the shape according to the construction location and situation at the construction site, so workability when constructing the protective plate Can be advantageously improved.

  In addition, since the protective plates are connected by the concave and convex fitting of the protrusions and the grooves formed on the side portions, a gap is generated in the connecting portion (seam) of the protective plate and the protective plate. However, when connecting a plurality of protective plates as in the case of a conventional protective plate, the risk that the tip of the machine tool may enter below the protective plate from the joint can be effectively avoided. .

  Further, according to one of the other desirable embodiments of the underground buried object protection plate according to the present invention, the underground buried object protection plate finely disperses spherical vanadium carbide in the martensite structure. Because it is made of alloy white cast iron, it can be used as a protective plate with superior cutting performance and impact resistance than conventional protective plates made of steel, and is used in concrete cutters. Even with a diamond blade, the problem that the protective plate is easily cut can be advantageously solved. Furthermore, from the place where the thickness of the plate-like portion located between the protrusions disposed on the surface of the protective plate of the underground buried object protective plate formed of such a material is at least 15 mm, Even when the tip of the machine tool comes into contact with the plate-like portion after passing through the protruding portion, the possibility that the protective plate is completely cut can be effectively avoided.

  Hereinafter, in order to clarify the present invention more specifically, representative embodiments of the present invention will be described in detail with reference to the drawings.

  First, FIG. 1 schematically shows a buried object protection plate 10 according to the present invention in the form of a plan view, and FIG. 2 and FIG. End surface explanatory drawing of the underground buried thing protection board 10 in a BB cutting line is each shown. And as obvious from those FIGS. 1 to 3, the underground buried object protection plate 10 has a substantially rectangular planar plate shape as a whole, and a large number of protrusions 12 are formed on the plate surface. Arranged in a staggered arrangement to form an uneven surface shape.

  More specifically, the buried object protection plate 10 here is obtained by finely and uniformly dispersing spherical vanadium carbide, which is a hard carbide, in a martensite structure, which is a very hard metal structure. It is cast and formed in a rectangular flat plate shape using alloy white cast iron. As shown in FIGS. 2 and 3, such a protective plate 10 has a predetermined thickness having an outer surface of an elliptical spherical shape or an oval shape formed with a curved surface shape as a whole. A large number of hollow protrusions 12 are formed on the surface of the plate in a staggered arrangement, and a flat plate-like portion 14 is formed between the protrusions 12 and 12.

  Of the four rectangular side portions of the underground buried object protection plate 10, adjacent two side portions 16 and 16 are grooves that open in the direction in which the protrusion 12 protrudes (upward in FIG. 2). 18 and 18 are formed in the direction in which the side portion 16 extends. On the other hand, the other side portions 20, 20 facing the side portions 16, 16 have a shape corresponding to the groove 18, and the shape of the ridges 22, 22 that can be engaged with the groove 18. However, it is formed in the direction in which the side portion 20 extends so as to protrude in the direction opposite to the opening direction of the groove 18, that is, in the downward direction in FIG. 2.

  And the underground object protection board 10 made into such an uneven surface shape accommodated the information cable 26 etc. which are embed | buried under the ground comparatively shallower than a road surface, for example, as FIG. 7 shows. Between the pipe line 28 and the road pavement such as asphalt or concrete, the projection 12 formed on the plate surface is embedded and used so as to protrude upward (to the road surface side). It is.

  Therefore, in the underground buried object protection plate 10 according to the present invention, when the tip of the work machine touches a large number of protrusions 12 arranged on the surface of the protection plate 10, for example, As schematically shown in FIG. 4, when the diamond blade 24 of the concrete cutter contacts the outer peripheral surface of the protrusion 12, the diamond blade 24 escapes to the side by the curved surface of the protrusion 12, and the diamond blade 24, the downward force applied to the projection 12, that is, the force to cut the underground buried object protection plate 10, is generated on the outer circumferential surface of the projection 12 with which the diamond blade 24 is in contact. Due to the inclination, the force is distributed in the downward direction and the horizontal direction, and the force for cutting the protective plate 10 is effective by the generation of the distributed lateral force. Manner and than so that the leg sweep member can be reduced, than Te, so that the flame cutting performance and impact performance of the underground object protection plate 10 is made to increase.

  In addition, in the present embodiment, the plurality of protrusions 12 are arranged in a staggered arrangement on the surface of the protective plate 10, so that a plate-like portion formed between the protrusions 12, 12 is provided. 14 is smaller than the area of the protrusion 12 and the length of the linear portion extending in the horizontal direction is shortened so that the tip of the work machine entering from the upper part of the protective plate 10 is brought into contact with the protrusion 12. Therefore, it is possible to avoid contact with the plate-like portion 14, and this makes it possible to more effectively reduce cutting at the plate-like portion 14 of the protection plate 10 due to contact with the tip of the work machine. It can be done.

  In addition, since the projections 12 arranged in large numbers on the surface of the protective plate 10 have a thinned structure having a predetermined thickness, the underground buried object protective plate 10 is manufactured. It is possible to effectively reduce the necessary materials for the manufacturing process, to reduce the cost required for the manufacturing, and to reduce the weight of the protective plate 10 as a whole. Can also be improved.

  Further, in the four sides of the underground buried object protection plate 10, the grooves 18 and the protrusions 22 are provided in the two opposing sides 16 and 20, so that a plurality of underground By superimposing the side portions of the buried object protection plates 10 and 10 and fitting the protrusions 22 of the other protection plate 10 into the groove 18 of one protection plate 10 as shown in FIG. The protective plates 10 can be easily connected to each other, and a plurality of protective plates 10 can be easily connected in either direction of the four sides of the rectangular shape as shown in FIG. It is. Moreover, since this connection operation only needs to carry out the uneven | corrugated fitting of the groove | channel 18 and the protruding item | line 22, the characteristic which does not have a possibility that the workability | operativity at the time of construction may deteriorate is exhibited.

  Moreover, in such a connecting portion, the protective plates 10 and 10 are overlapped with each other at the concave-convex fitting portion, and there is no gap between the protective plates 10 and 10. Like the protection plate of the structure like this, the tip of the work machine enters below the protection plate from the gap generated at the connecting part of the protection plates, and the pipe line embedded under the protection plate is cut This fear can be effectively eliminated.

By the way, in the martensite structure, which is a metal structure, which is a material forming the underground buried object protection plate 10, a material in which vanadium carbide, which is a very hard carbide, is finely and uniformly dispersed in a spherical shape. As disclosed in Japanese Patent Laid-Open No. 2002-275573, etc., in the present embodiment, the chemical component blending shown in Table 1 below is adopted. And as an alloy white cast iron which has such a component mixing | blending, it is commercialized by the name "STARK" from Okamoto Co., Ltd., for example, and such cast iron material will be employable suitably. Further, the alloy white cast iron shown in Table 1 has a tensile strength of 700 N / mm ² or more and a Rockwell hardness of 50-60 HRC, which combines the toughness of iron-based metals with the high hardness of carbides. Therefore, the difficult cutting performance and impact resistance performance of the underground buried object protection plate 10 having the above-described structure are further improved. Moreover, since it is manufactured by casting, it is possible to recover the used underground buried object protection plate 10 by collecting the used underground buried object protection plate 10, dissolving it again, and casting it. And can contribute to the promotion of recycling.

  In the present embodiment, the underground buried object protection plate 10 has a rectangular shape with a long side of about 500 mm and a short side of about 250 mm, and the overall height of the protection plate 10 (from the bottom surface of the protection plate 10). The height to the top of the protrusion 12 is about 35 mm. Further, the protrusion 12 is formed with a maximum circumferential diameter of about 40 mm and a thickness of 8 mm, and a plate-like portion located between the protrusions 12 and 12 formed on the surface of the protective plate 10. No. 18 has a thickness of 15 mm or more. As described above, since the underground buried object protection plate 10 is appropriately sized and formed, it is possible to advantageously improve the workability at the time of production and construction, and the protection plate 10. By combining a plurality of these, it becomes possible to obtain a shape having an arbitrary length or width according to the construction site. Further, since the thickness of the plate-like portion 18 between the protrusions 12 and 12 is 15 mm or more, even if the tip of the work machine avoids the protrusion 12 and contacts the protection plate 10, the protection plate 10 is completely The fear of being cut can be advantageously eliminated.

  The exemplary embodiments of the present invention have been described above. However, the present invention should not be construed as being limited to only such embodiments, and may vary based on the knowledge of those skilled in the art. The present invention can be implemented in a mode to which changes, modifications, improvements, and the like are added, and any such embodiment is included in the scope of the present invention without departing from the gist of the present invention. It goes without saying.

  For example, in the embodiment described above, the outer shape of the underground buried object protection plate 10 is rectangular, but it is of course possible to make it a square shape or other various polygonal shapes. And such a protection board 10 can be formed according to a well-known various manufacturing method besides the manufacturing method by a casting method.

  In addition, the diameter, height, and number of the projections 12 disposed on the surface of the protection plate 10 are appropriately determined according to the size and thickness of the protection plate 10. In addition to the elliptical spherical shape (oval shape) as in the present embodiment, the outer surface shape also has a spherical shape or a conical shape, as long as the outer surface shape is at least a cone-shaped or curved surface shape. A triangular pyramid shape or the like is appropriately selected and used. In addition, the outer surface shape of such a protrusion 12 is such that at least the top surface of the top portion is formed in a cone shape or a bay surface shape, so that when the tip of the work machine comes into contact, it escapes to the side. It is.

  Further, even if the plurality of protective plates 10 are connected, it is possible to adopt a form in which they are linearly connected in one direction in addition to the form in which they are connected in two directions as shown in FIG. is there.

  In addition, the material forming the protective plate 10 is also a hard material, and as long as it has sufficient hard cutting performance and impact resistance performance, in addition to the above-mentioned alloy white cast iron, various known materials Can be used.

It is a top view which shows an example of the underground buried object protection board according to this invention. FIG. 2 is an explanatory cross-sectional view showing an end surface cut along an AA cutting line in FIG. 1. It is a cross-sectional explanatory drawing which shows the end surface cut | disconnected by the BB cutting line in FIG. FIG. 6 is a cross-sectional explanatory view schematically showing a state in which the tip escapes when the tip of the work machine comes into contact with the protrusion disposed on the surface of the underground object protection plate according to the present invention. It is plane explanatory drawing which shows an example of the state which connected two or more of the underground buried object protection plates according to this invention. It is sectional explanatory drawing explaining the mode of the uneven | corrugated fitting of the connection part at the time of connecting the underground buried object protection plates according to this invention, Comprising: The end surface cut | disconnected by the CC cutting line in FIG. It is sectional explanatory drawing which shows roughly a mode when the underground buried object protection board according to this invention is embed | buried between a shallow pipe and a road surface.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Underground object protection board 12 Protrusion 14 Plate-like part 16 Side part 18 Groove 20 Side part 22 Projection

Claims (6)

  An underground buried object protection plate made of a hard material that is placed on a buried object such as a cable or pipe buried in the ground and protects the buried object from damage caused by work from the ground. The tip of the work machine that is formed in a form in which a plate surface is formed by projecting a large number of protrusions having an outer surface whose top surface is conical or curved, and is allowed to enter the ground from the ground. An underground buried object protection plate configured to be able to escape to the side by its outer surface shape when contacting the projection.   The underground buried object protection plate according to claim 1, wherein the protrusion is formed in a spherical shape or an elliptical spherical shape with a predetermined thickness.   The underground buried object protection plate according to claim 1 or 2, wherein the protrusions are arranged on the plate surface in a staggered arrangement.   The protective plate is configured in a rectangular shape, and grooves that open upward in the extending direction of the side portions are formed in two adjacent side portions of the rectangular shape, respectively. Downward protruding ridges that can be engaged with the grooves on the corresponding side portions are formed on the other two side portions that match each other in the extending direction of the side portions. The underground buried object protection plate according to any one of claims 1 to 3, wherein the two protection plates can be connected to each other.   5. The underground buried object protection plate according to claim 1, wherein the protection plate is made of alloy white cast iron in which spherical vanadium carbide is finely dispersed in a martensite structure. The underground buried object protection plate according to claim 5, wherein the plate-like portion located between the plurality of protrusions has a plate thickness of at least 15 mm.

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