JP2022125807A - Protector for underground buried object - Google Patents

Abstract

To provide a protector for an underground buried object that is capable of exhibiting higher protective performance in comparison with the conventional art.SOLUTION: A protector 10 for an underground buried object includes a box body 12 having an upper lid 18 and a lower box 20, a high work-hardenable steel plate 14 laid on the inner bottom surface of the lower box 20, and a high-strength fiber sheet 16 laid on the upper surface of the high work-hardenable steel plate 14 and formed in a net shape.SELECTED DRAWING: Figure 3

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underground buried object protector for protecting an underground buried object.

In recent years, for example, communication cables, gas and water pipes, etc. have been buried underground as buried objects. These buried objects may be damaged by being cut by the blade of a concrete cutter or the nail of a backhoe, or being punched by the chisel of a rock drill or concrete breaker during road construction, for example. There is

Therefore, in order to prevent damage to buried objects buried underground, various types of protective equipment for underground buried objects have been proposed (see, for example, Patent Documents 1 to 3).

For example, the protective equipment according to Example 1 of Patent Document 1 includes a hollow flat plate-shaped box whose exterior is made of a rigid body, a high-strength fiber sheet in a shape to be laid on the inner bottom surface of the box, and this high-strength fiber sheet. and an elastic body placed on the high-strength fiber sheet. It is characterized in that the member housed in the box is temporarily pressed and held between it and the inner ceiling.

In addition, the protective equipment according to Example 2 of Patent Document 1 includes a hollow flat plate-shaped box whose exterior is made of a rigid body, a high-strength fiber sheet having a shape to be laid on the inner bottom surface of the box, and this high-strength fiber sheet a sealing film that airtightly wraps the container, a spacer member that raises the internal pressure in the sealing film to float the high-strength fiber sheet wrapped in the sealing film from the inner bottom surface of the box, and the internal pressure created by the sealing film and an elastic body including a bulge, and this elastic body is housed so as to temporarily press and hold the members housed in the box between the inner ceiling of the box.

Furthermore, the protective device according to Example 3 of Patent Document 1 is the protective device described in Example 1 or Example 2, in which the spacer member is made of an elastic material, and the spacer member and the high-strength fiber sheet are combined. It is characterized in that a steel plate having a shape to be laid on the inner bottom surface of the box is interposed between them.

Japanese Patent No. 5322010 Japanese Patent No. 4351077 JP-A-2007-37240

SUMMARY OF THE INVENTION An object of the present invention is to provide a protective device for underground buried objects that can exhibit a higher degree of protection than conventional devices.

An underground buried object protective equipment according to an aspect of the present invention includes a box body having an upper lid and a lower box, a high work hardening steel plate laid on the inner bottom surface of the lower box, and a net shape laid on the upper surface of the high work hardening steel plate. and a high-strength fiber sheet formed on the

In the protective equipment for underground buried objects, the upper lid and the lower box may be made of hot-dip Zn--Al--Mg alloy-plated steel sheets.

In the protective equipment for underground buried objects, the high work hardening steel plate may be a high carbon/high manganese steel plate.

In the protective equipment for underground buried objects, the high-strength fiber sheet may be made of aramid fibers, synthetic fibers mixed with aramid fibers, or fibers made of polypropylene, polystyrene, or polycarbonate.

In the protective equipment for an underground buried object, the peripheral wall of the lower box may be formed with a protrusion that protrudes upward from the upper lid.

In the protective equipment for underground buried objects, the highly work-hardened steel plate may be formed into a curved shape that protrudes upward.

The protective equipment for underground buried objects may include only a box body, a highly work-hardened steel plate and a high-strength fiber sheet.

The protective equipment for underground buried objects may further include a spacer member arranged between the highly work-hardened steel plate and the high-strength fiber sheet.

In the protective equipment for underground buried objects, the spacer may be a frame along the outer shape of the high work hardening steel plate, and the high strength fiber sheet may be separated from the upper surface of the high work hardening steel plate inside the frame of the spacer. .

The protective equipment for underground buried objects may further include a waterproof cover covering the upper surface of the highly work-hardened steel plate.

ADVANTAGE OF THE INVENTION According to this invention, the underground buried object protective equipment which can exhibit high protective property can be provided compared with the former.

1 is a cross-sectional view showing an example of a state in which a protective device for underground buried objects according to an embodiment of the present invention is buried under the ground together with a plurality of buried objects; FIG. FIG. 2 is an exploded perspective view of the protective equipment for underground buried objects shown in FIG. 1; 2 is a cross-sectional view of the underground buried object protection shown in FIG. 1; FIG. FIG. 4 is a plan view showing a portion of the high-strength fiber sheet shown in FIG. 3; FIG. 2 is a vertical cross-sectional view showing an example of a state in which the blade of a concrete cutter hits the protective equipment for underground buried object shown in FIG. 1 ; FIG. 2 is a vertical cross-sectional view showing an example of a state in which a chisel of a concrete breaker hits the protective equipment for underground buried object shown in FIG. 1 ; FIG. 2 is a longitudinal sectional view showing a first modification of the protective equipment for underground buried objects shown in FIG. 1; 2 is an exploded perspective view showing a second modification of the protective equipment for underground buried objects shown in FIG. 1. FIG. FIG. 9 is a vertical cross-sectional view of the underground buried object protective equipment shown in FIG. 8 ; FIG. 9 is a vertical cross-sectional view showing an example of a state in which the blade of a concrete cutter hits the protective equipment for underground buried objects shown in FIG. 8 ; FIG. 3 is a longitudinal sectional view showing a third modification of the protective equipment for underground buried objects shown in FIG. 1;

An embodiment of the present invention will be described below.

First, a description will be given of the conventional protective equipment for underground buried objects assumed by one embodiment of the present invention and the problems thereof. As a conventional protective equipment for underground buried objects, a protective equipment has been proposed which has an elastic body composed of an air bag in addition to a box, a high-strength fiber sheet and a spacer member. In this protector, the number of members increases compared to the case where the protector consists of a box, a high-strength fiber sheet, and a spacer member, for example, resulting in an increase in cost.

As a conventional protective equipment for underground buried objects, a protective equipment has been proposed which includes an elastic body made of a sealing film in addition to a box, a high-strength fiber sheet and a spacer member. In this protector, the number of members increases compared to the case where the protector consists of a box, a high-strength fiber sheet, and a spacer member, for example, resulting in an increase in cost.

Furthermore, as a conventional underground buried object protective equipment, a protective equipment including a box body, a high-strength fiber sheet, a spacer member and a steel plate has been proposed. In this protective equipment, the number of members increases compared to the case where the protective equipment is composed of, for example, a box, a high-strength fiber sheet, and a steel plate, resulting in an increase in cost.

As a conventional protective equipment for underground buried objects, a protective equipment with a steel plate thickness of 9 mm to 16 mm has been proposed. In this armor, the thickness of the steel plate is thick, so the weight is increased.

One embodiment of the present invention described below provides, as an example, protective equipment for underground buried objects that can exhibit high protection while suppressing increases in cost and weight as compared with the above-described conventional protective equipment for underground buried objects. This is what we propose.

FIG. 1 is a cross-sectional view showing an example of a state in which an underground buried object protector 10 according to an embodiment of the present invention is buried under a ground surface 50 together with a plurality of buried objects 54 . An arrow UP indicates the upper side in the vertical direction. A concrete trough 52 having a U-shaped cross section is buried under the ground surface 50 , and the protective equipment for underground buried object 10 is placed on the upper part of the concrete trough 52 . The underground buried object protector 10 closes the opening formed in the upper part of the concrete trough 52 .

A plurality of buried objects 54 are installed inside the concrete trough 52 . The multiple buried objects 54 are, for example, communication cables, gas and water pipes, and the like. The multiple embedded objects 54 are not particularly limited and may be of any type. A plurality of buried objects 54 are placed on the inner bottom surface of the concrete trough 52 . The inside of this concrete trough 52 is filled with river sand 56 as an example.

2 is an exploded perspective view of the protective equipment for underground buried objects 10 shown in FIG. 1, and FIG. 3 is a sectional view of the protective equipment for underground buried objects 10 shown in FIG. The underground buried object protective equipment 10 includes a box body 12 , a highly work-hardened steel plate 14 , and a high-strength fiber sheet 16 .

The box 12 is formed by a flat plate-like hollow body. As an example, the box 12 is formed in a square shape in plan view. In addition, the box 12 may be formed in a shape other than a rectangular shape in plan view.

This box 12 has an upper lid 18 and a lower box 20 . The upper lid 18 has a top plate 22 and a peripheral wall 24 , and the lower box 20 has a bottom plate 26 and a peripheral wall 28 . When the upper cover 18 is assembled to the lower box 20 , the peripheral wall 28 of the lower box 20 is positioned inside the peripheral wall 24 of the upper cover 18 . The upper cover 18 is assembled to the lower box 20 while the high work hardening steel plate 14 and the high-strength fiber sheet 16, which will be described later, are accommodated in the lower box 20, and the gap between the upper cover 18 and the lower box 20 is waterproofed. . A waterproof seal is, for example, a weld. As a result, the inside of the box 12 is hermetically sealed to ensure waterproofness, so corrosion of the highly work-hardened steel plate 14 and deterioration of the high-strength fiber sheet 16 are suppressed.

The upper lid 18 and the lower box 20 are made of, for example, a hot-dip Zn--Al--Mg alloy plated steel plate (ternary plated steel plate) having excellent corrosion resistance. A hot-dip Zn-Al-Mg alloy-plated steel sheet is a steel sheet that includes a steel sheet and a coating layer, and the coating layer contains Zn, Al, and Mg.

The highly work-hardened steel plate 14 is laid on the inner bottom surface of the lower box 20 , that is, on the top surface of the bottom plate 26 . The highly work-hardened steel sheet 14 is, for example, formed into a flat plate shape. The highly work-hardened steel sheet 14 has the same planar shape as the inner bottom surface, that is, has a square shape in plan view. Moreover, this highly work-hardened steel plate 14 has a size that covers the entire inner bottom surface. This highly work hardened steel sheet 14 has high work hardenability. The high work hardening property means that, for example, when subjected to processing such as bending, the hardness is superior to that before processing.

This highly work-hardened steel sheet 14 is, for example, a high carbon/high manganese steel sheet. The high-carbon/high-manganese steel sheet used for the highly work-hardened steel sheet 14 is, for example, a steel sheet containing 0.5% or more of C (carbon) and 10% or more of Mn (manganese). Further, the plate thickness of the highly work-hardened steel plate 14 is, for example, 3.5 mm or more and 9 mm or less.

If the plate thickness of the high work-hardened steel plate 14 is 3.5 mm or more, even if the high work-hardened steel plate 14 is hit by a chisel of a concrete breaker as described later, the high work-hardened steel plate 14 will have a hole. The effect of preventing opening can be expected. On the other hand, if the plate thickness of the highly work-hardened steel plate 14 is set to 9 mm or less, the weight can be reduced as compared with the above-described conventional protective equipment for underground buried objects.

A high-strength fiber sheet 16 is laid on the upper surface of the highly work-hardened steel plate 14 . The high-strength fiber sheet 16 is made of, for example, aramid fibers or synthetic fibers mixed with aramid fibers. The high-strength fiber sheet 16 may be made of high-strength fibers made of polypropylene, polystyrene, or polycarbonate. High strength means having high tensile strength. Also, the high-strength fiber sheet 16 has high heat resistance.

4 is a plan view showing a portion of the high-strength fiber sheet 16 shown in FIG. 3. FIG. The high-strength fiber sheet 16 is formed in a net shape with a plurality of fibers 16A. A net shape is, for example, a shape formed by knitting fibers and having gaps (mesh) surrounded by the fibers. The method of weaving the high-strength fiber sheet 16 is not particularly limited. The weaving method of the high-strength fiber sheet 16 may be any weaving method other than leno weave, such as plain weave or twill weave. When the high-strength fiber sheet 16 is mesh-like, as will be described later, when the high-strength fiber sheet 16 comes into contact with the blade of a concrete cutter, the fibers of the high-strength fiber sheet 16 are easily unraveled, and the concrete cutter's fibers are easily loosened. It is easy to get entangled in the blade and difficult to cut.

The mesh size of the high-strength fiber sheet 16 is preferably 1 mm×1 mm or more. However, if the mesh is too large, the amount of fibers caught between the blade of the concrete cutter and the high work-hardened steel plate 14 is reduced, and the blade rotates to cut the high work-hardened steel plate 14 and pull the fibers. The force combined with the tensile force to try is the combination of the cutting resistance of the high work hardened steel plate 14, the tensile (shear) force of the fiber, and the frictional force between the fiber-blade-high work hardened steel plate due to the biting of the fiber. There is a risk that the force will be exceeded and the fibers will be cut. Therefore, the mesh size is preferably 10 mm×10 mm or less.

According to experiments by the inventors, the high-strength fiber sheet 16 was applied to a concrete cutter having a diamond tip portion thickness of 3.1 mm, a blade portion thickness of 2.5 mm, and a blade diameter of 370 mm. When the size of the mesh is 3 mm×4 mm, the result is obtained that the fibers are difficult to be cut and the fibers are easily entangled with the blade of the concrete cutter.

From the viewpoint of suppressing cost increase, the protective equipment for underground buried object 10 described above is, as an example, configured to include only the above-described box body 12, highly work-hardened steel plate 14, and high-strength fiber sheet 16.

FIG. 5 is a longitudinal sectional view showing an example of a state in which a blade 60 of a concrete cutter hits the protective equipment for underground buried object 10 shown in FIG. When the blade 60 of the concrete cutter strikes the protective equipment for underground buried object 10 from the side, the blade 60 cuts the box 12 . However, the grooves 62 of the blades 60 become entangled with the high-strength fiber sheet 16 before the entirety of the underground buried object protection 10 is cut by the blades 60 . At this time, since the high-strength fiber sheet 16 is net-like, when the high-strength fiber sheet 16 comes into contact with the blade 60 of the concrete cutter, the fibers of the high-strength fiber sheet 16 are easily loosened immediately, and the concrete cutter can be used. It is easily entangled with the blade 60 and is hard to be cut. Therefore, since the blade 60 and the high-strength fiber sheet 16 bite into the cut groove formed in the box 12 by the blade 60, the resistance to the rotation of the blade increases and the blade stops rotating. As a result, the blade 60 stops cutting the protective equipment 10 for underground buried objects, thereby preventing damage to the buried objects.

FIG. 6 is a longitudinal sectional view showing an example of a state in which the chisel 70 of the concrete breaker hits the protective equipment for underground buried object 10 shown in FIG. When the chisel 70 of the concrete breaker hits the protective equipment for underground buried object 10 from above, the chisel 70 penetrates the top plate 22 of the upper lid 18.例文帳に追加However, the highly work-hardened steel plate 14 receives the chisel 70 before the chisel 70 penetrates the entire underground buried object protection device 10 . At this time, since the highly work-hardened steel sheet 14 has work hardening properties, when the chisel 70 hits the highly work-hardened steel sheet 14, the highly work-hardened steel sheet 14 is work hardened. Therefore, the resistance to the chisel 70 is increased, and the descent of the chisel 70 is stopped. As a result, the chisel 70 is prevented from penetrating the underground buried object protector 10, thereby preventing damage to the buried object.

Next, the action and effect of one embodiment of the present invention will be described.

As described in detail above, in the underground buried object protective equipment 10 according to one embodiment of the present invention, the high-strength fiber sheet 16 is mesh-like, so when the high-strength fiber sheet 16 touches the blade 60 of the concrete cutter The fibers of the high-strength fiber sheet 16 are easily unraveled, easily entangled with the blade 60 of a concrete cutter, and are hard to be cut. Therefore, since the blades 60 and the high-strength fiber sheet 16 bite into the cut grooves formed in the box 12 by the blades 60, the resistance to the rotation of the blades 60 increases, and the blades 60 stop rotating. As a result, the blade 60 stops cutting the underground buried object protection device 10, so that the buried object 54 can be prevented from being damaged.

In addition, in the underground buried object protective equipment 10 according to one embodiment of the present invention, the highly work-hardened steel plate 14 has work hardening properties. do. Therefore, the resistance to the chisel 70 is increased, and the descent of the chisel 70 is stopped. As a result, the chisel 70 is prevented from penetrating the underground buried object protector 10, so that the buried object 54 can be prevented from being damaged.

As described above, according to the protective equipment for underground buried objects 10 according to one embodiment of the present invention, the high-strength fiber sheet 16 is mesh-like and the high work-hardening steel plate 14 has work-hardening properties. As compared with the above-mentioned conventional protective equipment for underground buried objects, which does not have the characteristics of (1), high protective performance can be exhibited.

Moreover, according to the underground buried object protective equipment 10 according to one embodiment of the present invention, the structure includes only the box 12 , the highly work-hardened steel plate 14 and the high-strength fiber sheet 16 . Therefore, the number of parts can be reduced as compared with the above-mentioned conventional protective equipment for underground buried objects, which includes an air bag, a sealing film, or a spacer member, so that the cost can be reduced.

In addition, according to the underground buried object protective equipment 10 according to one embodiment of the present invention, since the high work hardening steel plate 14 has work hardening property, high impact resistance performance can be secured, so the plate of the high work hardening steel plate 14 Thickness can be reduced. As a result, an increase in weight can be suppressed as compared with the above-described conventional protective equipment for underground buried objects that requires a thick steel plate.

(first modification)
Next, a modification of one embodiment of the present invention will be described.

FIG. 7 is a vertical cross-sectional view showing a first modification of the underground buried object protector 10 shown in FIG. In the modified example shown in FIG. 7, the configuration of the protective equipment for underground buried object 10 is changed as follows from the above-described embodiment.

That is, in the underground buried object protector 10 shown in FIG. 7, the peripheral wall 28 of the lower box 20 is positioned outside the peripheral wall 24 of the upper cover 18 when the upper cover 18 is assembled to the lower box 20 . A projection 30 is formed on the peripheral wall 28 of the lower box 20 . A plurality of protrusions 30 may be formed on the peripheral wall 28 of the lower box 20 at intervals, or may be formed annularly along the peripheral wall 28 of the lower box 20 . The protrusion 30 protrudes above the upper lid 18 . Further, a through hole 32 is formed in the projection 30 so as to extend therethrough in the horizontal direction. Further, the highly work-hardened steel sheet 14 is formed in a curved shape that protrudes upward.

7, since the projections 30 are formed on the peripheral wall 28 of the lower box 20, the protective equipment for underground buried objects 10 shown in FIG. Even if the braking force of a vehicle or the like acts on the surface layer covering the physical protective equipment 10 , the protrusions 30 can prevent the surface layer from slipping on the underground buried physical protective equipment 10 . As a result, the adhesion between the surface layer and the protective equipment for underground buried object 10 can be enhanced.

In addition, since through holes 32 are formed in the protrusions 30, for example, by fixing the protrusions 30 of a plurality of protective devices for underground buried objects 10 arranged in the horizontal direction with a locking member or a binding band, A plurality of underground installation protectors 10 can be connected. As a result, it is possible to prevent the burial positions of the plurality of protective devices for underground buried objects 10 from shifting with time.

Further, in the underground buried object protector 10 shown in FIG. 7, the highly work-hardened steel plate 14 is formed into a curved shape that protrudes upward. Therefore, when the blade 60 of the concrete cutter hits the protective equipment 10 from the side, the high-strength fiber sheet 16 moves toward the blade due to the inclination of the highly work-hardened steel plate 14. The fibers can be more easily entangled by the blades of the concrete cutter. Thereby, the cut resistance performance of the high-strength fiber sheet 16 can be improved.

Further, when the chisel 70 of the concrete breaker hits the high work-hardened steel plate 14, the inclination of the high work-hardened steel plate 14 disperses the hit points by the chisel 70, thereby suppressing concentration of the hit points at one point. Thereby, the impact resistance performance of the highly work-hardened steel sheet 14 can be improved.

(Second modification)
Next, a second modification of one embodiment of the present invention will be described.

FIG. 8 is an exploded perspective view showing a second modification of the underground buried object protector 10 shown in FIG. In the modified example shown in FIG. 8, the configuration of the protective equipment for underground buried object 10 is changed as follows from the above-described embodiment.

That is, in the underground buried object protective equipment 10 shown in FIG. separated from.

The spacer 80 is a frame having a shape along the outer shape of the high work hardening steel plate 14, and in the present embodiment, as an example, is a rectangular frame in a plan view. The shape of the spacer 80 may be any size as long as it can be accommodated inside the lower box 20 and the upper lid 18. Preferably, the frame portion of the spacer 80 has a diameter of 5 to 7 mm (6 mm in this embodiment). ) is a round bar. Moreover, the material of the spacer 80 is polyethylene foam, for example.

FIG. 9 is a longitudinal sectional view of the underground buried object protector 10 according to this modification. As shown in FIG. 9, the high-strength fiber sheet 16 is wrapped around at least two opposing sides of the spacer 80 from above and fixed under tension. Therefore, the high-strength fiber sheet 16 is kept spaced from the highly work-hardened steel plate 14 inside the frame of the spacer 80 . The high-strength fiber sheet 16 may be wound around the four sides of the spacer 80 and tension may be applied in two orthogonal directions.

FIG. 10 is a longitudinal sectional view showing an example of a state in which a blade 60 of a concrete cutter hits the protective equipment for underground buried object 10 according to this modified example. As with the burial object protector 10 according to one embodiment of the present invention (see FIG. 5), before the entire burial object protector 10 is cut by the blade 60, the grooves 62 of the blade 60 are filled with high-strength fibers. Sheet 16 comes into contact. At this time, since the high-strength fiber sheet 16 is separated from the high work hardening steel plate 14 , the blade 60 of the concrete cutter is likely to be caught in the mesh of the high-strength fiber sheet 16 . Thereby, the cut resistance performance of the high-strength fiber sheet 16 can be improved.

Note that the spacer according to this modification is not limited to a frame-shaped spacer. For example, it may be in the shape of a lattice, a pair of rods, a long flat plate, or the like.

(Third modification)
Next, a third modification of one embodiment of the present invention will be described.

FIG. 11 is a vertical cross-sectional view of the protective equipment for underground buried objects 10 showing a third modification of the protective equipment for underground buried objects 10 shown in FIG. In the modified example shown in FIG. 11, the configuration of the protective equipment for underground buried object 10 is changed as follows from the second modified example.

That is, the underground buried object protective equipment 10 shown in FIG. 11 further includes a waterproof covering material 82 that covers the upper surface of the highly work-hardened steel plate 14 . The cover material 82 prevents contact between the high work-hardened steel plate 14 and water or the like that has entered the inside of the box 12 from, for example, between the upper lid 18 and the lower box 20, and suppresses rusting of the high work-hardened steel plate 14. . In a second modification, the cover material 82 is formed in a bag shape and accommodates the highly work-hardened steel plate 14 inside. That is, the cover material 82 according to the second modification covers the entire surface of the highly work-hardened steel sheet 14 . The opening of the bag-shaped cover member 82 may be sealed by welding or the like after the highly work-hardened steel plate 14 is accommodated.

The cover material 82 may be made of any material as long as it can prevent the highly work-hardened steel plate 14 from being rusted by water or the like that has entered the inside of the box 12 . In particular, in the bag-shaped cover material 82 having an insertion opening smaller than one side of the high work hardened steel sheet 14 (for example, the structure in which an opening remains in the center of the lower surface as described above), OPP, which is a biaxially stretched material, is used. It is preferable to use

Here, if rust occurs on the upper surface of the highly work-hardened steel sheet 14, the highly work-hardened steel sheet 14 and the high-strength fiber sheet 16 may adhere to each other. In this case, the high-strength fiber sheet 16 is less likely to get entangled with the concrete cutter blade 60 even when the concrete cutter blade 60 hits the highly work-hardened steel plate 14 .

In this modified example, the top surface of the highly work-hardened steel sheet 14 is covered with the cover material 82 , thereby suppressing rusting on the top surface of the highly work-hardened steel sheet 14 . This suppresses adhesion between the highly work-hardened steel sheet 14 and the high-strength fiber sheet 16 due to rusting of the highly work-hardened steel sheet 14 . Thereby, the cut resistance performance of the high-strength fiber sheet 16 can be maintained for a long period of time.

Note that the cover member 82 may have any shape as long as it can prevent the highly work-hardened steel plate 14 from being rusted by water or the like that has entered the inside of the box 12 . For example, the cover material 82 is not limited to being bag-shaped as described above, and may be in the form of a single sheet. In this case, the sheet-shaped cover material 82 can be configured to cover the upper surface of the highly work-hardened steel sheet 14 in such a manner that the peripheral portion is woven into the lower surface side of the highly work-hardened steel sheet 14 .

Further, in the third modification of the present invention, the spacer 80 may not be provided, and the high-strength fiber sheet 16 may be placed on the upper surface of the highly work-hardened steel plate 14 covered with the cover material 82 . Even in this case, the above cover material 82 can further improve the reliability of the protective equipment for underground buried object 10 as compared with the one embodiment of the present invention.

In addition, in the protective equipment for underground buried objects 10 according to the above-described embodiment, the second modified example, and the third modified example, the peripheral wall 24 of the upper lid 18 is A configuration in which the peripheral wall of the lower box 20 is positioned on the outside may be employed.

An embodiment of the present invention has been described above, but the present invention is not limited to the above, and can of course be implemented in various modifications without departing from the gist of the present invention. is.

10 Underground buried object protective equipment 12 Box 14 High work hardening steel plate 16 High strength fiber sheet 18 Upper lid 20 Lower box 22 Top plate 24 Peripheral wall 26 Bottom plate 28 Peripheral wall 30 Projection 32 Through hole 50 Concrete trough 52 Buried object 54 River sand 60 Blade 62 Groove 70 chisel 80 spacer 82 cover material

Claims (10)

a box body having an upper lid and a lower box;
a highly work-hardened steel plate laid on the inner bottom surface of the lower box;
A high-strength fiber sheet laid on the upper surface of the high work hardening steel plate and formed in a net shape;
Underground protection with The upper lid and the lower box are made of hot-dip Zn-Al-Mg alloy-plated steel sheets,
The protective equipment for underground buried objects according to claim 1. The high work hardening steel plate is a high carbon/high manganese steel plate,
3. The protective equipment for underground buried objects according to claim 1 or 2. The high-strength fiber sheet is formed of aramid fibers, synthetic fibers mixed with aramid fibers, or fibers made of polypropylene, polystyrene or polycarbonate,
The protective equipment for underground buried objects according to any one of claims 1 to 3. The peripheral wall of the lower box is formed with a protrusion that protrudes above the upper lid.
The protective equipment for underground buried objects according to any one of claims 1 to 4. The highly work-hardened steel sheet is formed into a curved shape that protrudes upward,
The protective equipment for underground buried objects according to any one of claims 1 to 5. Only comprising the box, the highly work-hardened steel plate and the high-strength fiber sheet,
The protective equipment for underground buried objects according to any one of claims 1 to 6. Further comprising a spacer disposed between the highly work-hardened steel plate and the high-strength fiber sheet,
The protective equipment for underground buried objects according to any one of claims 1 to 7. The spacer is a frame along the outer shape of the highly work-hardened steel plate,
The high-strength fiber sheet is separated from the upper surface of the high work-hardened steel plate inside the frame of the spacer,
The protective equipment for underground buried objects according to claim 8. Further comprising a waterproof cover covering the upper surface of the high work hardening steel plate,
The protective equipment for underground buried objects according to any one of claims 1 to 9.

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