JP7432433B2 - Buried object protection equipment and installation structure - Google Patents

Description

The present invention relates to a buried object protector for protecting underground objects from civil engineering work tools such as road cutters, and an installation structure thereof.

Underground objects such as pipes and wiring are buried under road paving materials. When cutting paving materials with a road cutter during road construction, the cutter may accidentally cut underground objects and damage them. In order to prevent such damage, various buried object protectors are used.

For example, Patent Document 1 discloses an underground protective device that stops a rotating pavement cutting cutter blade (road cutter) to prevent damage to a buried object to be protected. Hereinafter, in the relevant paragraph, the code of Patent Document 1 is shown in parentheses. The underground protective equipment of Patent Document 1 includes a hollow flat box (1) whose exterior is made of a rigid body, and a high-strength fiber sheet (2) that is spread over the inner bottom surface of the box (1). The elastic body (7) placed on the high-strength fiber sheet (2) is suspended from the bottom of the box (1) by the spacer member (5), and the elastic body (7) The members housed in the body (1) are temporarily held under pressure. The underground buried object protection equipment is buried underground between the buried object to be protected (15) and the paved road surface (12). When the pavement cutting cutter blade (11) cuts into the protective equipment, the high-strength fiber sheet (2) gets entangled in the groove of the cutter blade (11) before the entire protective equipment is cut, and the cutter blade ( 11) bite into the cut grooves made in the box body (1) one after another together with the high-strength fiber sheet (2) and resist the rotation of the cutter blade (11). As a result, the overload protection device of the pavement cutting cutter is activated and stops the rotation of the cutter blade (11), thereby preventing damage to the protected buried object (15) buried below.

Patent Document 2 discloses a cutting protection material for underground objects for a road cutter. Hereinafter, in the relevant paragraph, the code of Patent Document 2 is shown in parentheses. The cutting protection material (1) of Patent Document 2 preferably has a concrete (5) covering the outer periphery of a pipe material (4) made of synthetic resin such as vinyl chloride, polypropylene, polyethylene, etc. to a certain thickness T (15 mm or more). A plurality of long fiber materials (6) which are hard to cut and easily tangled and are difficult to cut with a road cutter (3) are inserted in the longitudinal direction inside the hollow part of the pipe material (4) in an unrestrained state. It is configured as follows. When constructing an underground object (2), it is used by burying it at a position slightly closer to the ground surface than the underground object (2) and on both sides along the underground object (2). During subsequent road construction, etc., even if a worker operates a road cutter (3) to cut the road without any prior knowledge of the existence of underground objects (2), the cutter (3) When approaching the underground object (2), the cutter (3) cuts the concrete (5) of the cutting protection material (1), and then proceeds to cut the pipe material (4). The long fiber material (6), which is difficult to cut and easily tangled, which is inserted into the hollow part in an unrestrained state, clings to the cutting edge of the cutter (3) without being cut, and slips out from the cut end (7) of the concrete (5). It becomes like being pulled out. As a result, the frictional force against the cutter (3) becomes enormous, making the rotation of the cutter (3) extremely difficult or even stopping it, making it necessary to interrupt the cutting operation.

JP2011-211883A Japanese Patent Application Publication No. 2004-360867

In the underground protective equipment of Patent Document 1, when a metal plate (box) is cut with a road cutter, metal burrs are likely to occur in the cut groove. Therefore, the problem is that the high-strength fiber sheet often gets caught in the metal burr of the cut groove and cannot be pulled out from the cut groove before it is sufficiently entwined with the blade of the road cutter. As described above, if the high-strength fiber sheet is not pulled out from the kerf, the rotation of the blade cannot be stopped and the protection function of underground objects cannot be reliably exerted, which is a problem. On the other hand, the cutting protection material of Patent Document 2 uses a concrete exterior material instead of using a metal plate. This cutting protection material does not cause problems due to the generation of metal burrs. However, since the cutting protection material requires a concrete exterior material with a thickness of 15 mm or more, there is a problem in that the weight and external size become large, making handling inconvenient.

The present invention has been made in order to solve at least one of the above problems, and its purpose is to more reliably exhibit the protection function of underground buried objects and/or to provide buried objects that are lightweight, compact, and easy to handle. The objective is to provide protective equipment and its installation structure.

A buried object protector according to one embodiment of the present invention is a buried object protector for protecting underground objects from road cutters, and includes:
a sheet member configured to wrap around the rotary blade of the road cutter when it comes into contact with the rotary blade;
a hollow cylindrical inner shell member that accommodates the sheet member in an unrestricted state;
a rigid and hollow cylindrical outer shell member that accommodates the inner shell member therein;
A gap is formed between the outer surface of the inner shell member and the inner surface of the outer shell member in at least a portion of the inner shell member and the outer shell member in a circumferential direction.

A buried object protector according to a further embodiment of the present invention is characterized in that the buried object protector according to the above embodiment further includes a waterproof or low water permeable bag member surrounding the sheet member.

A buried object protector according to a further embodiment of the present invention is characterized in that, in the buried object protector of the above embodiment , the void is formed over the entire circumferential direction of the inner shell member and the outer shell member.

A buried object protector according to a further embodiment of the present invention is characterized in that, in the buried object protector of the above embodiment , the outer shell member is thinner than the inner shell member.

A buried object protector according to a further embodiment of the present invention is characterized in that, in the buried object protector of the above embodiment , the inner shell member is made of synthetic resin, and the outer shell member is made of metal.

A buried object protector according to a further embodiment of the present invention is characterized in that, in the buried object protector of the above embodiment , an end of the outer shell member is closed by a closing member.

In a buried object protector according to a further aspect of the present invention , in the buried object protector according to the above embodiment , the end portion of the inner shell member is arranged so that the outer surface of the inner shell member is spaced apart from the inner surface of the outer shell member in the entire circumferential direction. It is characterized by being supported by a closing member.

In a buried object protector according to a further aspect of the present invention , in the buried object protector of the above embodiment , the inner shell member has a substantially circular cross-sectional shape, and the outer shell member has a substantially rectangular cross-sectional shape. It is characterized by

In a buried object protector according to a further aspect of the present invention , in the buried object protector according to the above embodiment , the sheet member is folded into a substantially U-shape or a substantially V-shape in a cross-sectional view and accommodated in the inner shell member. It is characterized by being

A buried object protector according to one embodiment of the present invention is a buried object protector for protecting underground objects from road cutters, and includes:
a sheet member configured to wrap around the rotary blade of the road cutter when it comes into contact with the rotary blade;
a waterproof or low water permeability bag member surrounding the sheet member;
a cylindrical member that accommodates the sheet member in an unrestricted state;
The sheet member is folded into a substantially U-shape or a substantially V-shape when viewed in cross section, and is accommodated in the inner shell member.

A buried object protector according to a further embodiment of the present invention is characterized in that, in the buried object protector of the above embodiment , the sheet member is held so as not to roll in the circumferential direction inside the inner shell member. .

A buried object protector according to a further aspect of the present invention is characterized in that the buried object protector according to the above embodiment further includes a display section that externally displays the direction of the folded posture of the sheet member.

A buried object protector according to one embodiment of the present invention is a buried object protector for protecting underground objects from road cutters, and includes:
a sheet member configured to wrap around the rotary blade of the road cutter when it comes into contact with the rotary blade;
a waterproof or low water permeability bag member surrounding the sheet member;
a hollow cylindrical inner shell member made of synthetic resin that accommodates the sheet member in an unrestricted state;
a rigid and hollow cylindrical metal outer shell member that accommodates the inner shell member therein;
The outer shell member is thinner than the inner shell member.

An installation structure of one form of the present invention is an installation structure in which a buried object protection device for protecting underground objects from road cutters is installed,
The buried object protection equipment is
a sheet member configured to wrap around the rotary blade of the road cutter when it comes into contact with the rotary blade;
a hollow cylindrical inner shell member that accommodates the sheet member in an unrestricted state;
a rigid and hollow cylindrical outer shell member that accommodates the inner shell member therein;
A gap is formed between the outer surface of the inner shell member and the inner surface of the outer shell member, at least on the outer surface of the inner shell member facing the ground side.

An installation structure of one form of the present invention is an installation structure in which a buried object protection device for protecting underground objects from road cutters is installed,
The buried object protection equipment is
a sheet member configured to wrap around the rotary blade of the road cutter when it comes into contact with the rotary blade;
a hollow cylindrical inner shell member that accommodates the sheet member in an unrestricted state;
a rigid and hollow cylindrical outer shell member that accommodates the inner shell member therein;
The sheet member is accommodated in the inner shell member by being bent into a substantially U-shape or a substantially V-shape in a cross-sectional view of the buried object protection device, and the sheet member has a substantially U-shape or a substantially V-shape. It is characterized by being arranged so that its open end faces the ground side.

The installation structure described in one embodiment of the present invention is an installation structure in which a buried object protection device for protecting underground objects from road cutters is installed,
The buried object protection equipment is
a sheet member configured to wrap around the rotary blade of the road cutter when it comes into contact with the rotary blade;
a waterproof or low water permeability bag member surrounding the sheet member;
a cylindrical member that accommodates the sheet member in an unrestricted state;
The sheet member is folded into a substantially U-shape or a substantially V-shape in a cross-sectional view of the buried object protector, and is accommodated in the cylinder member, and the sheet member is bent into a substantially U-shape or a substantially V-shape. It is characterized by being arranged so that the open end faces the ground side.

According to the buried object protector of one embodiment of the present invention (paragraph 0008) , when the road cutter comes into contact with the buried object protector, the rotary blade of the road cutter cuts the rigid outer shell member and cuts the inner shell member. After cutting it open and reaching the sheet member, the unrestrained sheet member is entangled by the rotary blade and reaches the cut in the outer shell member, and is further entangled with the rotary blade while being pulled out to the outside, causing the operation of the road cutter. make it stop. By making the buried object protection equipment a cylindrical member with a double cylindrical structure consisting of an inner shell member and an outer shell member, after the rotary blade cuts the outer shell member, it cuts the inner shell member and reaches the sheet member. There will be a slight time difference. In the present invention, in addition to this time difference, since a gap is formed between the inner shell member and the outer shell member, the time required from being entangled with the rotary blade to reaching the cut in the outer shell member is By securing a longer length, it is possible to increase the amount of entanglement of the sheet member with the rotary blade before the sheet member is pulled out from the cut. That is, in the present invention, by winding up the sheet member with the rotary blade inside the outer shell member, it is possible to more reliably pull out the sheet member from the cut in the outer shell member without using a concrete exterior material. Become. Therefore, the buried object protection device of the present invention is lightweight, compact, and easy to handle, and more reliably exhibits the function of protecting underground objects.

According to the buried object protection device of the further embodiment (paragraph 0009) of the present invention , in addition to the effects of the above invention, the waterproof or low water permeability bag member surrounds the sheet member, so that It is possible to prevent the member from being submerged in water, and when the road cutter comes into contact with the buried object protector, it can become entangled with the rotary blade before being exposed to water.

According to the buried object protection device according to a further embodiment of the present invention (paragraph 0010) , in addition to the effects of the above invention, since a gap is formed over the entire circumferential direction, the rotary blade of the road cutter No matter which outer surface it comes into contact with, it can stably exhibit its protective function.

According to the buried object protector of the further embodiment (paragraph 0011) of the present invention , in addition to the effects of the above invention, the outer shell member is thinner than the inner shell member, so that the outer shape of the buried object protector can be made more compact. It can be made into something.

According to the buried object protector of a further embodiment (paragraph 0012) of the present invention , in addition to the effects of the above invention, the inner shell member is made of synthetic resin and the outer shell member is made of metal, so that buried objects can be protected against buried objects. Protective equipment can be made lighter.

According to the buried object protector of a further embodiment (paragraph 0013) of the present invention , in addition to the effects of the above invention, the ends of the outer shell member are closed by the closing member, so that water, soil, etc. can be prevented from entering the inside. Intrusion can be prevented.

According to the buried object protector of the further embodiment (paragraph 0014) of the present invention , in addition to the effects of the above invention, the closing member holds the inner shell member floating from the outer shell member, so that it can be easily configured in the circumferential direction. A void can be formed throughout.

According to the buried object protector of the further embodiment (paragraph 0015) of the present invention , in addition to the effects of the above invention, the buried object protector has a rectangular outer shape, so that the buried object protector is prevented from rolling after installation. It can be prevented. Furthermore, a wider gap can be formed between the round inner shell member and the square outer shell member (compared to the case where they are round), reducing the amount of entanglement of the sheet member with the rotating blade. You can increase it more.

According to the buried object protector of the further embodiment (paragraph 0016) of the present invention , in addition to the effects of the above invention, since the sheet member takes a substantially U-shaped or substantially V-shaped posture in a cross-sectional view, rotational When the blade comes into contact with the sheet member, it is possible to unfold the sheet member in a straight line, wrap it around the rotary blade, and easily pull it out to the outside.

According to the buried object protector of one embodiment of the present invention (paragraph 0017) , when the road cutter comes into contact with the buried object protector, the rotary blade cuts through the cylindrical wall of the cylindrical member and reaches the sheet member, and then the The sheet member in a restrained state is entangled with the rotary blade, and is pulled out from the cylindrical member and entangled with the rotary blade, thereby stopping the operation of the road cutter. In addition, by surrounding the sheet member with a waterproof or low-permeable bag member, it is possible to prevent the sheet member from being submerged in water underground, and to protect it from water when the road cutter comes into contact with the buried object protection equipment. It is possible to become entangled with the rotating blade before being exposed to the This suppresses a decrease in the amount of entanglement due to water wetting of the sheet member. Furthermore, since the sheet member assumes a substantially U-shaped or substantially V-shaped posture in cross-sectional view, when the rotary blade comes into contact with the sheet member, the sheet member can be unfolded in a straight line and wrapped around the rotary blade, making it easy to remove it from the outside. It is possible to withdraw it. That is, in the present invention, with the above configuration, the sheet member can be more reliably pulled out from the cut in the cylindrical member, and the protection function for underground objects can be more reliably exhibited.

According to the buried object protector of the further embodiment (paragraph 0018) of the present invention , in addition to the effects of the above-mentioned invention, the sheet member is held so as not to roll in the circumferential direction inside the inner shell member. The posture of the sheet member can be maintained such that the substantially U-shaped or substantially V-shaped open end is placed in a position where it can easily come into contact with the rotary blade.

According to the buried object protector of a further embodiment (paragraph 0019) of the present invention , in addition to the effects of the above invention, the substantially U-shaped or substantially V-shaped open end is arranged at a position where it can easily come into contact with the rotating blade. Thus, the posture of the sheet member can be visually grasped.

According to the buried object protector of one embodiment of the present invention (paragraph 0020) , when the road cutter comes into contact with the buried object protector, the rotary blade of the road cutter cuts the rigid outer shell member and cuts the inner shell member. After cutting it open and reaching the sheet member, the unrestrained sheet member is entangled by the rotary blade and reaches the cut in the outer shell member, and is further entangled with the rotary blade while being pulled out to the outside, causing the operation of the road cutter. make it stop. In addition, the present invention has a metal outer shell member disposed outside an inner shell member made of synthetic resin that accommodates the sheet member in an unrestricted state, and the outer shell member is made thinner than the inner shell member. It is characterized by That is, in the present invention, the buried object protector is a cylinder member with a double cylinder structure consisting of an inner shell member and an outer shell member, so that after the rotary blade cuts the outer shell member, the inner shell member is cut and a sheet is formed. A slight time difference occurs until the sheet member reaches the member, and as a result, the amount of entanglement of the sheet member with the rotary blade before being pulled out from the cut in the outer shell member can be increased. This increase in the amount of entanglement makes it possible to more reliably pull out the sheet member from the cut in the outer shell member. Furthermore, the buried object protector of the present invention is lightweight, compact, and easily handled by making the outer shell member thinner than the inner shell member.

According to the installation structure described in one embodiment of the present invention (paragraph 0021) , when the road cutter comes into contact with the buried object protection equipment, the rotary blade of the road cutter cuts the rigid outer shell member and cuts the inner shell member. After being cut open and reaching the sheet member, the unrestrained sheet member is entangled by the rotary blade and reaches the cut in the outer shell member, and is further entangled with the rotary blade while being pulled out to the outside, causing the operation of the road cutter. make it stop. By making the buried object protection equipment a cylindrical member with a double cylindrical structure consisting of an inner shell member and an outer shell member, after the rotary blade cuts the outer shell member, it cuts the inner shell member and reaches the sheet member. There will be a slight time difference. In the present invention, in addition to this time difference, a gap is formed between the inner shell member and the outer shell member, so that from the time when the sheet member is entangled with the rotating blade until reaching the cut in the outer shell member, the gap is formed between the inner shell member and the outer shell member. By ensuring a longer time or distance, it is possible to increase the amount of entanglement of the sheet member with the rotary blade before the sheet member is pulled out from the cut. In particular, in many cases, the rotary blade comes into contact with the buried object protector from above, so by providing a gap on at least the outer surface of the inner shell member facing the ground side, the amount of entanglement can be effectively increased. That is, in the present invention, the sheet member is wound up by the rotary blade inside the outer shell member, so that the sheet member can be more reliably pulled out from the cut in the outer shell member without using a concrete exterior material. Become. Therefore, the installation structure of the present invention more reliably exhibits the protection function of underground objects.

According to the installation structure of one embodiment of the present invention (paragraph 0022) , when the road cutter comes into contact with the buried object protection equipment, the rotary blade of the road cutter cuts the rigid outer shell member and cuts open the inner shell member. After reaching the sheet member, the unrestrained sheet member is entangled by the rotary blade, reaches the cut in the outer shell member, and is further entangled with the rotary blade while being pulled out to the outside, stopping the operation of the road cutter. . By making the buried object protection equipment a cylindrical member with a double cylindrical structure consisting of an inner shell member and an outer shell member, after the rotary blade cuts the outer shell member, it cuts the inner shell member and reaches the sheet member. There will be a slight time difference. As a result, the amount of entanglement of the sheet member with the rotary blade before being pulled out from the cut in the outer shell member can be increased. Furthermore, in the present invention, the sheet member is folded into a substantially U-shape or a substantially V-shape in a cross-sectional view of the buried object protection device, and is accommodated in the inner shell member. It is arranged so that the open end of the shape faces the ground side. As a result, the rotary blade that came into contact with the buried object protector from above comes into contact with the approximately U-shaped or approximately V-shaped open end, and the sheet member is unfolded linearly and wrapped around the rotary blade, and the outer shell member is It can be easily pulled out from the cut. That is, in the present invention, by winding up the sheet member with the rotary blade inside the outer shell member, it is possible to more reliably pull out the sheet member from the cut in the outer shell member without using a concrete exterior material. Become. Therefore, the installation structure of the present invention more reliably exhibits the function of protecting underground objects.

According to the installation structure of one embodiment of the present invention (paragraph 0023) , when the road cutter comes into contact with the buried object protection equipment, the rotary blade cuts through the cylindrical wall of the cylindrical member and reaches the sheet member, and then the unrestrained state is reached. The sheet member is entangled with the rotary blade, and is pulled out from the cylindrical member and entangled with the rotary blade, thereby stopping the operation of the road cutter. In addition, by surrounding the sheet member with a waterproof or low-permeable bag member, it is possible to prevent the sheet member from being submerged in water underground, and to protect it from water when the road cutter comes into contact with the buried object protection equipment. It is possible to become entangled with the rotating blade before being exposed to the This suppresses a decrease in the amount of entanglement due to water wetting of the sheet member. Furthermore, in the present invention, the sheet member is folded into a substantially U-shape or a substantially V-shape in a cross-sectional view of the buried object protection device, and is accommodated in the inner shell member. It is arranged so that the open end of the shape faces the ground side. As a result, the rotary blade that comes into contact with the buried object protection device from above comes into contact with the open end of the approximately U-shape or V-shape, and the sheet member is unfolded in a straight line and wrapped around the rotary blade, creating a cut in the cylindrical member. It can be easily pulled out from the outside. That is, in the present invention, with the above configuration, the sheet member can be more reliably pulled out from the cut in the cylindrical member. Therefore, the installation structure of the present invention more reliably exhibits the function of protecting underground objects.

FIG. 1 is a schematic perspective view of a buried object protection device according to an embodiment of the present invention. (a) A front view and (b) a top view of the buried object protection equipment of FIG. 1. AA cross-sectional view of the buried object protection equipment in FIG. 1. (a) BB vertical sectional view and (b) CC vertical sectional view of the buried object protection equipment in FIG. 1. FIG. 2 is an exploded perspective view of the buried object protection device shown in FIG. 1; (a) A perspective view from the front, (b) a perspective view from the back, (c) a top view, (d) a side view, and (e) a DD sectional view of the closing member of the buried object protection device in FIG. 1. FIG. 2 is a schematic diagram illustrating a mode in which underground buried objects are protected from a rotary blade of a road cutter using a buried object protector according to an embodiment of the present invention, in which the rotary blade approaches the buried object protector and cuts the outer shell member. Show stages. FIG. 2 is a schematic diagram illustrating how underground buried objects are protected from the rotary blade of a road cutter by the buried object protector according to an embodiment of the present invention; Indicates the stage at which to stop. FIG. 2 is a schematic plan view of a first installation structure using a buried object protection device according to an embodiment of the present invention. FIG. 9 is a sectional view taken along line EE of the first installation structure in FIG. 9; (a) A perspective view seen from above, and (b) a perspective view seen from below, of a buried object protection device using a buried object protection device according to an embodiment of the present invention. (a) A top view, (b) a front view, and (c) a bottom view of the buried object protection device of FIG. 11. FF sectional view of the buried object protection device in FIG. 12. FIG. 12 is a partially exploded perspective view of the buried object protection device of FIG. 11. (a) A perspective view seen from above, and (b) a perspective view seen from below, of the board of the buried object protection device of FIG. 11. 16(a) is a plan view, (b) is a front view, and (c) is a bottom view of the substrate of FIG. 15. FIG. FIG. 3 is a schematic plan view of a second installation structure using a buried object protection device according to an embodiment of the present invention. GG sectional view of the second installation structure in FIG. 17. FIG. 18 is a sectional view taken along line HH of the second installation structure in FIG. 17; FIG. 7 is a schematic cross-sectional view showing another example of use of the buried object protection device according to the embodiment of the present invention. FIG. 6 is a schematic perspective view of a buried object protection device of a buried object protection device according to another embodiment of the present invention. (a) A front view and (b) a plan view of the buried object protection equipment of FIG. 21. (a) II cross-sectional view and (b) J-J vertical cross-sectional view of the buried object protection equipment in FIG. 21. FIG. 22 is a schematic diagram illustrating how an underground buried object is protected from a rotary blade of a road cutter by the buried object protector of FIG. 21, and shows a stage in which the rotary blade approaches the buried object protector and cuts the outer shell member. FIG. 22 is a schematic diagram illustrating how an underground buried object is protected from a rotary blade of a road cutter by the buried object protector of FIG. 21, and shows a stage in which the rotary blade approaches the buried object protector and cuts the outer shell member. Schematic diagram showing a modification of the buried object protection device of the present invention.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. Note that the shapes in the figures referred to in the following description are conceptual diagrams or schematic diagrams for explaining preferred shapes and dimensions, and the dimensional ratios etc. do not necessarily match the actual dimensional ratios. That is, the present invention is not limited to the dimensional ratios in the drawings.

The buried object protection device 100 according to an embodiment of the present invention is used to protect underground objects such as wiring and piping materials buried under road paving materials from civil engineering work tools such as road cutters. In particular, the buried object protector 100 of this embodiment is buried so as to be interposed between a paving material and an underground object, and when a road cutter that cuts the paving material comes into contact with the buried object protector 100. , directly or indirectly stops the operation of the road cutter to prevent the road cutter from accidentally reaching underground objects. The configuration of the buried object protection device 100 will be described in detail with reference to FIGS. 1 to 5. FIG. 1 is a schematic perspective view of a buried object protection device 100. FIGS. 2A and 2B are a front view and a plan view of the buried object protection device 100. FIG. 3 is an AA cross-sectional view of the buried object protection device 100. FIGS. 4(a) and 4(b) are a BB longitudinal sectional view and a CC longitudinal sectional view of the buried object protection equipment 100. FIG. 5 is an exploded perspective view of the buried object protection device 100.

As shown in FIGS. 1 to 5, the buried object protection device 100 is an elongated body having a rectangular bar-like external shape extending a predetermined length. The buried object protection device 100 includes a sheet member 101 and a hollow cylindrical member 102 that accommodates the sheet member 101 therein.

The sheet member 101 is a flexible sheet that extends over the entire length of the buried object protector 100. Although not shown, the sheet member 101 has a rectangular shape when unfolded, and is bent inside the cylindrical member 102 to form a V or U shape when viewed in cross section. In this embodiment, as shown in FIG. 3, the sheet member 101 is doubled and folded into a substantially U-shape or a substantially V-shape in a cross-sectional view. Further, the sheet member 101 is made of a material that gets caught in the groove of the rotary blade and becomes entangled with the rotary blade when it comes into contact with the rotary blade of the road cutter. In this embodiment, sheet member 101 may be formed from a high strength fiber sheet. More specifically, the sheet member 101 may be formed from a woven fabric or non-woven fabric of aramid fibers, a woven fabric or non-woven fabric mixed with aramid fibers, or the like. It goes without saying that the sheet member is not limited to the above-mentioned materials as long as it can wrap around the rotary blade of the road cutter.

Further, the sheet member 101 is surrounded by a bag member 105 in a sealed manner. The bag member 105 is made of waterproof or low-water permeability material, and functions to prevent water from seeping into the inside. In other words, the bag member 105 prevents the sheet member 101 from being submerged in water underground, and when the road cutter comes into contact with the buried object protection equipment 100, the bag member 105 prevents the sheet member 101 from being flooded with water. Allows for intertwining. The bag member 105 may be selected from bags made of general synthetic resins such as vinyl chloride and polypropylene. The bag member 105 has a fragility that can be easily torn when a rotary blade of a road cutter comes into contact with it.

The sheet member 101 sealed inside the bag member 105 is housed inside the cylinder member 102 in an unrestricted state. The unrestricted state means a state in which the sheet member 101 is not completely fixed to the cylindrical member 102 and is movable or displaceable inside the cylindrical member 102. Further, the sheet member 101 is configured to come into contact with the inner surface of the cylindrical member 102 (inner shell member 103). Due to the stiffness (firmness or elasticity) of the sheet member 101 that is bent into a substantially U-shape or a substantially V-shape, the sheet member 101 maintains the folded posture and is prevented from rolling in the circumferential direction inside the cylindrical member 102. Retained.

The cylindrical member 102 is a double cylindrical body that extends a predetermined length and is open at both ends. The cylindrical member 102 includes an inner shell member 103 made of synthetic resin (or non-metal), and an outer shell member 104 made of metal and housing the inner shell member 103 therein with a gap therebetween. In other words, the cylindrical member 102 has a double cylindrical structure consisting of an inner shell member 103 and an outer shell member 104, which are separate members made of different materials and whose cylindrical walls are not integrally bonded or bonded to each other. have Note that since the outer shell member 104 is made of a metal tube, the inner shell member 103 made of synthetic resin is prevented from deforming due to earth pressure or heat from asphalt. In particular, the gap between the inner shell member 103 and the outer shell member 104 further reduces heat transfer. Further, the inner shell member 103 is made of a round cylinder with a substantially circular cross section, and the outer shell member 104 is a square cylinder with a substantially square cross section. The inner shell member 103 is made of a synthetic resin material that is relatively easy to cut with a rotating blade and is less likely to generate burrs on the cut surface. The outer shell member 104 has enough rigidity to slow the rotation of the rotary blade of the road cutter when it comes into contact with it, and is formed of a steel plate or the like having higher rigidity than the inner shell member 103. Further, the outer shell member 104 is formed thinner than the inner shell member 103. As shown in FIGS. 3 and 4, the inner shell member 103 and the outer shell member 104 are arranged coaxially, and in the entire circumferential direction of the inner shell member 103 and the outer shell member 104, the outer surface of the inner shell member 103 and the outer shell member 104, a gap is formed between the inner surface and the inner surface. This gap is continuous over almost the entire length of the cylindrical member 102. Since the inner shell member 103 has a circular cross section and the outer shell member 104 has a rectangular cross section, as shown in FIG. 3 and FIG. 4(b), four corners of the outer shell member 104 are formed. At this point, the size of the gap (the distance between the outer surface of the inner shell member 103 and the inner surface of the outer shell member 104 along the radial direction) becomes maximum.

Both ends of the cylindrical member 102 are each closed by a closing member 106. 6(a) to (e) are a front perspective view, a rear perspective view, a front view, a side view, and a DD sectional view of the closing member 106. The closing member 106 has a rectangular plate-shaped closing portion 106a that closes both ends of the cylindrical member 102. The closing portion 106a has an inner surface facing the cylindrical member 102 side and an outer surface opposite thereto. The outer shape of the closing portion 106a is the same as the outer peripheral shape of the outer shell member 104. Further, a first connecting portion 106b extending into a rectangular tube shape is provided near the inner periphery of the closing portion 106a. The first connecting portion 106b is configured to be inserted and fitted into the end portion of the outer shell member 104. Further, on the inner surface of the closing portion 106a, a second connecting portion 106c extending in a cylindrical shape is provided inside the first connecting portion 106b. The second connecting portion 106c is configured to be inserted and fitted onto the end portion of the inner shell member 103. That is, when closing the cylindrical member 102, the closing member 106 functions to hold the inner shell member 103 and the outer shell member 104 together and to separate them from each other in the entire circumferential direction. Further, the closing member 106 allows the inner shell member 103 and the outer shell member 104 to be easily assembled without using means such as welding.

An arrow-shaped display section 107 is provided on the outer surface of the closing section 106a. The display section 107 displays the direction of the folded posture of the sheet member 101 to the outside. In other words, the display section 107 shows the direction in which the buried object protection device 100 is placed. Here, the closing member 106 is attached to the cylindrical member 102 so that the direction of the arrow on the display section 107 and the substantially U-shaped or substantially V-shaped open end of the sheet member 101 are in the same direction. As will be described later, the buried object protector 100 is installed such that the open end of the sheet member 101 having a substantially U-shape or a substantially V-shape faces upward.

Next, with reference to FIGS. 7 and 8, when the rotary blade X of the road cutter comes into contact with the buried object protector 100, a manner in which the buried object protector 100 stops the operation of the road cutter will be described. In the description, the buried object protection device 100 is exemplarily buried directly under the paving material 18 that pavers the surface of the road 15 and above the underground buried object 12. Further, a concrete portion 17 is placed between the paving material 18 and the underground object 12. In addition, the structure illustrated here corresponds to the 1st installation structure 10 mentioned later.

When the rotary blade X of the road cutter moves straight while cutting the paving material 18 and enters the protection area above the underground buried object 12, the rotary blade X contacts the buried object protector 100. As shown in FIG. 7, the rotary blade X comes into contact with the upper corner of the outer shell member 104 of the buried object protector 100 and cuts its flesh. At this time, since the outer shell member 104 is made of a rigid material (steel material), the rotation speed of the rotary blade X decreases. Note that by cutting the outer shell member 104, metal burrs may be formed at the cuts in the outer shell member 104.

When the rotary blade X moves straight further, the rotary blade X reaches the inner shell member 103 and cuts the flesh part of the inner shell member 103. Since the inner shell member 103 is made of a synthetic resin material (relatively soft compared to a steel plate), burrs are less likely to form at the cuts. When the rotary blade X reaches the inside of the inner shell member 103, the rotary blade X contacts the sheet member 101 in the unrestrained state. At this time, the rotary blade It can come into contact with blade X. At the same time as this contact, the bag member 105 immediately breaks, and the sheet member 101 begins to become entangled with the rotary blade X. It is conceivable that the sheet member 101 becomes entangled with the rotary blade X while being unfolded from a U- or V-shaped folded position.

As shown in FIG. 8, while the sheet member 101 is entangled with the rotary blade X, the sheet member 101 passes through the cuts in the inner shell member 103 and the outer shell member 104 to the outside before the cylindrical member 102 is completely cut. drawn out. In particular, in the buried object protector 100 of the present embodiment, since the cylindrical member 102 has a double cylindrical structure, the rotary blade There will be a significant time difference. This time difference allows the sheet member 101 to wrap around the rotary blade X before reaching the cut in the outer shell member 104 . In addition to the time difference, due to the existence of a gap between the inner shell member 103 and the outer shell member 104, a certain amount of entanglement occurs until the sheet member 101 reaches the break in the outer shell member 104. can be effectively secured. That is, the buried object protector 100 has not only a space within the inner shell member 103 but also a space in which the sheet member 101 can move freely due to the two-stage arrangement of the gap between the inner shell member 103 and the outer shell member 104. . As a result, the frequency at which the sheet member 101 is caught by metal burrs at the cuts in the outer shell member 104 can be significantly reduced. Then, as the sheet member 101 is pulled out to the outside and becomes entangled with the rotary blade Alternatively, it is possible to notice a change in the condition and prompt the road cutter to stop operating. Thereby, the operator can notice that the rotary blade X of the road cutter has entered the protected area of the underground object 12, and can avoid damage to the underground object 12.

In addition, by arranging the U-shaped or V-shaped open end in a folded position with the open end facing the ground side, compared to placing it in other positions (for example, with the open end facing downward or to the side). The inventors have confirmed that the precision with which the sheet member 101 is pulled out of the buried object protector 100 and the rotary blade X is stopped is significantly improved. Specifically, when we conducted an experiment by changing only the orientation of the sheet member 101, we found that in other orientations, the probability of the sheet member 101 being pulled out was accurate to about 7 out of 10 times. In the above posture, the sheet member 101 was pulled out and the rotary blade X could be stopped with accuracy 10 times out of 10.

A first installation structure 10 according to an embodiment of the present invention will be described with reference to FIGS. 9 and 10. The installation structure 10 is a structure in which a plurality of buried object protectors 100 are installed under the road 15 in order to protect the underground objects 12 buried under the road 15 from the rotary blade X of the road cutter. FIG. 9 is a schematic plan view of the installation structure 10. FIG. 10 is a sectional view taken along line EE.

In the installation structure 10 of this embodiment, as shown in FIGS. 9 and 10, the road 15 is formed with a roadbed 16 that forms an underground layer of crushed stone or soil, and a part of the roadbed 16 that is excavated. The road 15 is made up of a concrete part 17 and a paving material 18 forming the surface layer of the road 15. Further, in this embodiment, the underground object 12 is exemplified as two wiring/piping materials laid underground. In the installation structure 10, long underground objects 12 such as wiring and piping materials are laid in the excavated groove of the roadbed 16, and then a concrete section 17 is installed in the excavated groove to cover and protect the underground objects 12. has been poured. In order to protect the underground object 12 from road cutters during excavation work for the road 15, a plurality of object protectors 100 are buried underground. Each buried object protection device 100 is arranged such that the U-shaped or V-shaped open end of the sheet member 101 in the folded position faces the ground side.

The plurality of buried object protectors 100 are arranged in a ladder shape above the underground buried object 12 extending in the longitudinal direction in a plan view shown in FIG. In the installation structure 10 of this embodiment, a plurality of buried object protectors 100 are arranged in a predetermined pattern to construct a protection area that protects underground buried objects 12 from the rotary blade of a road cutter moving straight ahead. In particular, the plurality of buried object protectors 100 include a first buried object protector 1001 having a first length, and a second buried object protector 1001 having a second length smaller than the first length. 1002. In this embodiment, the first length is approximately twice the second length. The first buried object protectors 1001 of the plurality of buried object protectors 100 are arranged along the arrangement direction of the underground objects 12, and the second buried object protectors 1002 are arranged along the arrangement direction of the underground objects 12. They are arranged along the direction perpendicular to the installation direction (hereinafter referred to as the orthogonal direction). The first buried object protectors 1001 are arranged in a plurality of rows (here, three rows) in the installation direction. Moreover, the buried object protectors 1001, 1001 adjacent to each other in the arrangement direction are arranged slightly shifted in the orthogonal direction so as to partially overlap in the arrangement direction. On the other hand, the second buried object protectors 1002 are arranged so as to span between the rows of the first buried object protectors 1001 arranged in parallel. In this embodiment, two second buried object protectors 1002 are installed for one first buried object protector 1001. That is, in the installation structure 10, the first buried object protector 1001 and the second buried object protector 1002 are assembled in a grid shape without any gaps, so that the rotary blade of the road cutter moves straight and is protected from the outside. The rotary blade has an arrangement structure configured so that the rotary blade always passes through the buried object protection device 100 when entering the inside of the area.

Moreover, it is preferable that the intervals between the buried object protectors 100 arranged in parallel vertically and horizontally be equal to or less than the diameter of the rotary blade of the road cutter. Furthermore, it is more preferable that the distance on the diagonal line of one grid of the buried object protection equipment 100 is equal to or less than the diameter of the rotary blade of the road cutter. Moreover, it is preferable that the interval between the buried object protectors 100 is determined according to the burial depth of the underground object 12 (distance from the surface of the road 15 to the upper surface of the underground object 12). By doing so, even if the rotating blade approaches from directly above the protected area of the road 15, the buried object protection device 100 can be effectively applied to the rotating blade before the rotating blade comes into contact with the underground object 12. This allows the installation structure 10 to exhibit higher protection performance. As an example of this embodiment, the diameter of the rotary blade is 550 mm, the depth of the top surface of the underground object 12 is 200 mm, and based on these conditions, the first length of the buried object protector 100 is determined. is about 600 mm, the second length is about 300 mm, one side of the rectangular cross section of the buried object protector 100 is about 40 mm, and the interval between the buried object protectors 100 in parallel is about 300 mm. Ordained.

As shown in FIG. 10, each buried object protection device 100 is installed between the paving material 18 and the underground buried object 12. More specifically, the buried object protector 100 is located in the upper part of the concrete part 17 and is buried at a depth adjacent to the lower surface of the paving material 18. That is, since a part of the outer surface of the buried object protector 100 faces the ground without the paving material 18, there is an advantage that it is easy to know where the buried object protector 100 is buried during road construction. Further, when constructing the installation structure 10, after laying the underground objects 12 in the excavated groove of the roadbed 16 and filling the excavated groove with concrete material, the buried object protection device 100 is installed before the concrete material hardens. This arrangement also has the advantage that the buried object protector 100 can be easily installed at a predetermined position.

Next, a method for constructing the installation structure 10 of this embodiment will be described. First, the roadbed 16 of the road 15 is excavated to form an excavated trench as a space in which the underground object 12 is installed. Next, the underground objects 12 are placed in the excavated grooves of the roadbed 16. Then, in order to form a concrete portion 17 around the underground object 12, concrete material is poured into the excavated groove of the roadbed 16 to fill it. Before the concrete material hardens, a plurality of buried object protectors 100 are arranged in a predetermined pattern so as to form a protected area above the underground object 12. At this time, by embedding each buried object protector 100 in the concrete material so that its upper surface is exposed upward, the plurality of buried object protectors 100 can be arranged based on a predetermined pattern while visually checking. can. In addition, each buried object protector 100 is arranged so that the arrow on the display section 107 points upward. After the concrete material has hardened to form the concrete section 17, the installation structure 10 can be constructed by forming a layer of paving material 18 on the top surface of the roadbed 16 and the concrete section 17.

The buried object protection device of the present invention may be used as a buried object protection device in which a plurality of buried object protection devices are combined on a substrate. A buried object protection device 11 according to an embodiment of the present invention will be described with reference to FIGS. 11 to 14. FIGS. 11(a) and 11(b) are schematic perspective views of the buried object protection device 11 seen from above and below. FIGS. 12(a) to 12(c) are a plan view, a front view, and a bottom view of the buried object protection device 11. FIG. 13 is a cross-sectional view taken along the line FF of the buried object protection device 11. FIG. 14 is an exploded perspective view of the buried object protection device 11.

As shown in FIGS. 11 and 12, the buried object protection device 11 includes a plurality of cylindrical buried object protectors 100, a planarly extending substrate 120, and a substrate 120 that connects the buried object protectors 100 to the substrate 120. and a plurality of fixing members 130 for fixing to. As shown in FIG. 14, a plurality of buried object protectors 100 are arranged on the upper surface of a substrate 120, and each buried object protector 100 is fixed by a plurality of fixing members 130, so that the buried object protector 11 is installed. It is assembled. Each component of the buried object protection device 11 will be explained below.

The substrate 120 constituting the buried object protection device 11 is a rectangular plate having long sides and short sides. 15(a) and 15(b) are schematic perspective views of the substrate 120 seen from above and below. FIGS. 16(a) to 16(c) are a plan view, a front view, and a bottom view of the buried object protection device 11. The substrate 120 has an upper surface facing above ground and a lower surface facing underground. In this embodiment, the substrate 120 is made of a hard and high-strength synthetic resin material that is strong enough to withstand impact from civil engineering tools such as pickaxes. Alternatively, the substrate 120 may be made of a steel plate instead of a synthetic resin material. The substrate 120 can function to cover and protect the underground object from the ground side instead of or together with the concrete part that protects the underground object.

As shown in FIGS. 15 and 16, the substrate 120 is provided with a plurality of fixing holes 121 for fixing the plurality of buried object protectors 100. In this embodiment, the plurality of fixing holes 121 are configured to fix four buried object protectors 1001 and 1002 on four sides, and to fix one buried object protector 1002 in parallel to the short side at the center of the board 120. It is located in Further, the substrate 120 includes a connection mechanism for connecting adjacent substrates 120 (having the same shape as itself) to each other. The coupling mechanism is configured to allow buried object protectors 100, 100 to be aligned in a straight line across adjacent substrates 120, 120. More specifically, the connection mechanism accommodates the connection piece 122 protruding from the outer periphery of the substrate 120 and the claw portion of the connection piece 122 of the other buried object protection device 11, and moves the connection piece 122 in the protruding direction. It has a locking groove 123 for locking. The connecting piece 122 is formed on one of the pair of long sides of the substrate 120 and on one of the pair of short sides. The locking groove 123 is formed on the other long side and the other short side of the substrate 120. The connecting piece 122 extends from the outer periphery of the substrate 120 and has a claw portion bent toward the upper surface at its tip. The locking groove 123 is formed as a narrow groove recessed in the lower surface of the substrate 120 near the edge thereof. The locking groove 123 has a slit width that can accommodate the claw portion of the connecting piece 122. Note that since the hook-shaped connecting piece 122 overlaps the locking groove 123 in the vertical direction, it is difficult for the two to separate. Further, the locking groove 123 has a predetermined slit length so as to accommodate the connecting piece 122 slidably in a direction (slit length direction) perpendicular to the protruding direction thereof. That is, the connection mechanism can connect one buried object protection device 11 to another buried object protection device 11 and align the buried object protection devices 11 in a straight line. Alternatively, if necessary, by sliding the connecting piece 122 along the slit length within the locking groove 123, adjacent buried object protection devices 11 can be disposed offset in the orthogonal direction.

As shown in FIG. 14, the fixing member 130 includes a saddle-shaped support fitting 131, a bolt 132, and a nut 133. The support fitting 131 has a U-shaped support portion 131a that restrains the buried object protection device 100 from above, and a fixing portion 131b that is fixed to the substrate 120. As shown in FIG. 13, when the support portion 131a of the support fitting 131 covers the buried object protector 100 placed on the substrate 120, the shaft of the bolt 132 is connected to the fixing hole 121 of the substrate 120 and the support fitting 131 is fixed. The buried object protector 100 is fixed to the upper surface of the substrate 120 by passing through the portion 131b from the lower surface side and screwing the nut 133 onto the shaft tip of the bolt 132 from the upper surface side of the substrate 120. In other words, the operator can operate the fixing member 130 from the upper surface side of the substrate 120 to attach and detach the buried object protector 100 to and from the substrate 120.

Based on the above explanation, the overall configuration of the buried object protection device 11 will be explained in more detail. In the buried object protection device 11 of this embodiment, each buried object protection device 100 is fixed only to the upper surface of the substrate 120 via a fixing member 130, as shown in FIGS. 11 and 12. In other words, by arranging the buried object protector 100 on the upper surface of the substrate 120, the rotary blade of a road cutter that approaches from the ground can contact the outer surface of the buried object protector 100 preferentially than the substrate 120. Damage to the substrate 120 can be suppressed. As shown in FIG. 13, the substantially U-shaped or substantially V-shaped open end of the sheet member 101 is arranged so as to face above the substrate 120. Further, the buried object protector 100 is fixed to each side of the substrate 120 so as to surround the rectangular outer periphery of the substrate 120 without any gaps. In other words, at least some of the plurality of buried object protectors 100 are arranged side by side so that their cylinder axes are parallel to each other. Specifically, a relatively long first buried object protector 1001 (having a length corresponding to the long side of the board 120) is arranged on each long side of the board 120, and A relatively short second buried object protector 1002 (having a length corresponding to the short side of the substrate 120) is arranged. A second buried object protector 1002 is additionally arranged between the second buried object protectors 1002 arranged on both short sides. That is, two closed grids are formed on the upper surface of the substrate 120 by a plurality of buried object protectors 100 (five in this embodiment). That is, in the buried object protection device 11, the first buried object protection device 1001 and the second buried object protection device 1002 are assembled in a grid shape without any gaps, so that the rotary blade of the road cutter can move straight and prevent damage from the outside. The rotary blade has an array structure configured such that the rotary blade always passes through the buried object protector 100 when entering the substrate 120. Therefore, the buried object protection device 11 is installed (one or more) above the underground object, and can form a protection area that protects the underground object 12 over a predetermined range.

Further, the dimensions and shape of the substrate 120 and the fixed positions of the buried object protectors 100 are determined such that the distance between the buried object protectors 100 is equal to or less than the diameter of the rotary blade of the road cutter. More preferably, the distance on the diagonal line of one grid of the buried object protector 100 installed on the substrate 120 is designed to be equal to or less than the diameter of the rotary blade of the road cutter. Moreover, it is preferable that the interval between the buried object protectors 100 is determined according to the burial depth of the underground object (distance from the road surface to the top surface of the underground object). By doing so, even if the rotating blade approaches from directly above the protected area of the road or the substrate 120, the buried object protection device 100 can be effectively applied to the rotating blade before the rotating blade comes into contact with the underground object. This allows the buried object protection device 11 to exhibit higher protection performance. Further, the substrate 120 was formed to be thinner than the cross-sectional dimension of the buried object protection device 100 in consideration of weight reduction and improved handling. In particular, since the substrate 120 is made of a relatively thin synthetic resin material, it is lighter than a concrete plate. As an example of this embodiment, it is assumed that the diameter of the rotary blade is 550 mm and the depth of the top surface of the underground object 12 is 200 mm, and based on these conditions, the thickness of the substrate 120 is approximately 15 mm. The long side of the board 120 is about 600 mm, the first length of the buried object protector 100 is about 600 mm, the short side of the board 120 is about 380 mm, and the second length is about 300 mm. One side of the rectangular cross section of the buried object protector 100 was set to be approximately 40 mm, and the interval between adjacent buried object protectors 100 was determined to be approximately 300 mm.

That is, in the buried object protection device 11 according to the present embodiment, the plurality of longitudinal buried object protection devices 100 are fixed to the substrate 120, so that the buried object protection device 100 protects the rotary blade of the road cutter moving straight. The underground objects 12 can be efficiently protected by being received by the sides. Therefore, the buried object protection device 11 of the present embodiment does not cover the entire upper region of the underground object 12 with buried object protection equipment 100 (e.g., steel plate, high-strength fiber sheet) as in the conventional case. By simply installing the buried object protection device 100 in a closed frame shape, it is possible to easily and efficiently define the protection area for the underground buried object 12 inside each side by simply installing it in the area.

Next, a second installation structure 10' using the buried object protection device 11 will be described with reference to FIGS. 17 to 19. The installation structure 10' is a structure in which a plurality of buried object protection devices 11 are installed under the road 15 in order to protect the underground objects 12 buried under the road 15 from the rotary blade X of the road cutter. . FIG. 17 is a schematic plan view of the installation structure 10'. 18 and 19 are a GG cross-sectional view and a H-H cross-sectional view thereof.

In the installation structure 10' of this embodiment, as shown in FIGS. 17 to 19, the road 15 includes a roadbed 16 that forms an underground layer of crushed stone or soil, a backfill section 19 that is made of sand or high-quality soil, and The paving material 18 forms the surface layer of the road 15. Further, in the present embodiment, similarly, the underground object 12 is exemplified as two wiring/piping materials laid underground. In the installation structure 10', long underground objects 12 such as wiring and piping materials are laid in the excavated grooves of the roadbed 16, and then sand or high-quality sand is placed in the excavated grooves to cover and protect the underground objects 12. A backfill portion 19 is formed by filling with soil. A plurality of buried object protection devices 11 are buried underground in order to protect the underground objects 12 from civil engineering work tools such as road cutters and pickaxes during excavation work for the road 15. In each buried object protection device 11, the buried object protection device 100 is arranged such that the U-shaped or V-shaped open end of the sheet member 101 in the folded position faces the ground side.

In a plan view shown in FIG. 17, the plurality of buried object protection devices 11 are arranged linearly above the underground buried object 12 that extends longitudinally in the installation direction. The plurality of buried object protection devices 11 are laid out without gaps along the installation direction. Furthermore, the plurality of buried object protectors 100 (second buried object protectors 1002) are continuously aligned in a straight line without interruption in the direction in which the underground object 12 is arranged. Further, a plurality of buried object protectors 100 (first buried object protectors 1001) are arranged in parallel along a direction perpendicular to the arrangement direction (hereinafter referred to as orthogonal direction). That is, the installation structure 10' of this embodiment constructs a protection area that protects underground buried objects 12 from the rotary blade of a road cutter that moves straight by arranging a plurality of buried object protectors 100 in a predetermined pattern. There is. In the installation structure 10', the first buried object protector 1001 and the second buried object protector 1002 are assembled in a lattice shape without any gaps, so that the rotary blade of the road cutter can move straight and be removed from the outside. The rotary blade is configured to always pass through the buried object protector 100 when entering the protected area.

Further, as shown in FIG. 18, the buried object protection device 11 is arranged directly under the paving material 18, and as a result, each buried object protection device 100 is installed between the paving material 18 and the underground buried object 12. There is. More specifically, the buried object protection device 11 is located above the roadbed 16 in the upper layer of the backfill section 19, and is buried at a depth such that the upper surface of the buried object protection device 100 is adjacent to the lower surface of the paving material 18. There is. That is, since a part of the outer surface of the buried object protector 100 faces the ground without the paving material 18, there is an advantage that it is easy to know where the buried object protector 100 is buried during road construction. Further, as shown in FIG. 18, the substrate 120 functions to protect the underground object 12 from civil engineering work tools such as pickaxes by covering the underground object 12 from the ground side instead of the concrete part. . Therefore, in the installation structure 10' of this embodiment, the buried object protector 100 and the substrate 120 cooperate to effectively protect the underground object 12. Further, as shown in FIG. 19, each buried object protection device 11 is connected to an adjacent buried object protection device 11 in the installation direction via a connecting mechanism (connecting piece 122 and locking groove 123). There is. By connecting the plurality of buried object protection devices 11 using the connection mechanism, it is possible to easily align the plurality of buried object protection devices 11 and buried object protection devices 100 in a straight line. Note that in the illustrated example, the substrates 120, 120 are connected to each other via a connection mechanism formed on the long side of the substrate 120, but instead of or in addition to this, a connection mechanism is formed on the short side. The substrates 120, 120 may be connected via the formed connection mechanism. Alternatively, the substrates 120, 120 may be connected to each other in an arbitrary pattern by alternately using a connecting mechanism on the long side and a connecting mechanism on the short side.

Next, a method for constructing the second installation structure 10' of this embodiment will be described. First, the roadbed 16 of the road 15 is excavated to form an excavated trench as a space in which the underground object 12 is installed. Next, the underground objects 12 are placed in the excavated groove of the roadbed 16 while filling the excavated groove with sand or high-quality soil. Then, the underground object 12 is filled with sand or high-quality soil to form a backfill portion 19. Next, the excavated roadbed material is again filled above the backfilling portion 19. A plurality of buried object protection devices 11 are connected and arranged linearly along the installation direction of the underground object 12 so as to form a protection area above the underground object 12. Since the connecting mechanism allows the substrates 120 to be displaced in the orthogonal direction, it becomes easy to connect the substrates 120 to each other. After arranging the plurality of buried object protection devices 11 on the underground buried object 12, a roadbed material is placed on the substrate 120 so that the upper surface of each buried object protection device 100 is exposed upward. Then, by forming a layer of paving material 18 on the upper surface of the roadbed 16, the installation structure 10' can be constructed.

FIG. 20 shows another usage example of the buried object protection device 100 of this embodiment. As shown in FIG. 20, the buried object protection device 100 may be integrated with a trough 13 that forms an electric wire common trench under the road and is capable of accommodating electric wires 12 therein. Here, the electric wires inside the trough 13 correspond to the underground object 12. The trough 13 includes a trough body 13a and a trough lid 13b. A plurality of buried object protectors 100 are integrally fixed to the upper surface of the trough lid 13b, which corresponds to the substrate. That is, in the trough 13, the plurality of buried object protectors 100 and the trough lid 13b can function as the buried object protection device 11 described above. Therefore, by providing the buried object protection device 11 or the buried object protection device 100, the trough 13 can protect the electric wires therein from the rotary blade of the road cutter.

Hereinafter, the effects of the buried object protection device 100 according to one embodiment of the present invention will be explained.

According to the buried object protector 100 of the present embodiment, when the road cutter comes into contact with the buried object protector 100, the rotary blade of the road cutter cuts the rigid outer shell member 104, cuts open the inner shell member 103, and cuts the inner shell member 103 into a sheet. After reaching the member 101, the unrestrained sheet member 101 is entangled by the rotating blade, reaches the cut in the outer shell member 104, and is further entangled with the rotating blade while being pulled out to the outside, causing the rotating blade to rotate. make it stop. In the buried object protection device 100, since the cylinder member 102 has a double cylinder structure, there is a slight time difference between when the rotary blade cuts the outer shell member 104 and when the inner shell member 103 is cut. In addition to this time difference, due to the gap formed between the inner shell member 103 and the outer shell member 104, the time from when the sheet member 101 is entangled with the rotating blade until it reaches the cut in the outer shell member 104 is It is possible to secure a longer time or distance and increase the amount of entanglement of the sheet member 101 with the rotary blade before the sheet member 101 is pulled out from the cut. Further, the sheet member 101 is bent into a substantially U-shape or a substantially V-shape in a cross-sectional view of the buried object protection device 100 and accommodated in the inner shell member 103. It is arranged so that the open end of the shape faces the ground side. As a result, the rotary blade that has contacted the buried object protector 100 from above comes into contact with the open end of the approximately U-shape or V-shape, and the sheet member 101 is unfolded linearly and wrapped around the rotary blade, and the outer shell is It is possible to easily pull the member 104 out through the cut. That is, according to the buried object protector 100 of this embodiment, the sheet member 101 is effectively wound up by the rotary blade inside the outer shell member 104, so that the sheet member 101 can be rolled up without using a concrete exterior material. 101 can be pulled out from the cut in the outer shell member 104 more reliably. Furthermore, the buried object protector 100 of this embodiment has an outer shell member 104 that is thinner than the inner shell member 103, so that it is lighter, more compact, and easier to handle than those using conventional concrete exterior materials. It is composed of Therefore, the buried object protection device 100 of the present embodiment is lightweight, compact, and easy to handle, and exhibits the protection function of the underground buried object 12 with higher precision.

The present invention is not limited to the embodiments described above, and can take various embodiments and modifications. Modifications of the present invention will be described below. In each embodiment or modified example, components having the same last two digits have the same or similar features unless otherwise specified, and their descriptions will be partially omitted.

(1) In the buried object protection device of the present invention, the buried object protection device is not limited to the aspects of the above embodiment. A buried object protection device 200 according to another embodiment will be described with reference to FIGS. 21 to 25. Similar to the above embodiment, the buried object protector 200 is interposed between the paving material and the underground object, and when the road cutter that cuts the paving material comes into contact with the buried object protector 200, the road cutter protects the buried object 200. It directly or indirectly stops the operation. FIG. 21 is a schematic perspective view of the buried object protection device 200. FIGS. 22(a) and 22(b) are a front view and a plan view of the buried object protection device 200. 23(a) and 23(b) are a cross-sectional view along II and a vertical cross-sectional view along JJ of the buried object protection device 200. FIGS. 24 and 25 are schematic diagrams showing how underground objects are protected from the rotary blade of a road cutter using the object protector 200.

As shown in FIGS. 21 to 23, the buried object protection device 200 is an elongated body having a rectangular rod-like outer shape extending a predetermined length. The buried object protection device 200 includes a sheet member 201, a bag member 205 surrounding the sheet member 201, a hollow cylindrical member 202 that accommodates the sheet member 201 inside, and both ends of the cylinder member 202. and a closing member 206 for closing. Here, the configurations of the sheet member 201, the bag member 205, and the closing member 206 are the same as those of the buried object protection device 100 described above, and therefore the description thereof will be omitted. The cylindrical member 202 is a rectangular cylindrical body made of non-metal (specifically, made of synthetic resin) that extends a predetermined length and is open at both ends. This cylindrical member 202 may be a round cylindrical body. The sheet member 201 sealed inside the bag member 205 is housed inside the cylinder member 202 in an unrestricted state. The sheet member 201 is configured to abut against the inner surface of the cylindrical wall of the cylindrical member 202 . Due to the stiffness (firmness or elasticity) of the sheet member 201 that is bent into a substantially U-shape or a substantially V-shape, the sheet member 201 maintains the folded posture and is prevented from rolling in the circumferential direction inside the cylindrical member 102. Retained. It is preferable that the buried object protector 200 is installed such that the open end of the substantially U-shaped or substantially V-shaped sheet member 201 faces upward. Note that the cylindrical member 202 has enough rigidity to delay rotation when it comes into contact with a rotary blade of a road cutter, and may be formed of a metal material such as a steel plate having relatively high rigidity.

Next, with reference to FIGS. 24 and 25, a description will be given of a mode in which the operation of the road cutter is stopped by the buried object protector 200 when the rotary blade X of the road cutter comes into contact with the buried object protector 200. In the description, the buried object protection device 200 is illustratively fixed to the upper surface of a substrate 220 as a part of the buried object protection device 21, and is directly under the paving material 28 that pavers the surface of the road 25 and of the underground buried object 22. It is buried above.

When the rotary blade X of the road cutter moves straight while cutting the paving material 28 and enters the protected area above the underground buried object 22, the rotary blade X contacts the buried object protector 200. As shown in FIG. 24, the rotary blade X comes into contact with the upper corner of the cylindrical member 202 of the buried object protector 200 and cuts its flesh. When the rotary blade X reaches the inside of the cylindrical member 202, the rotary blade X contacts the sheet member 201 in the unrestrained state. At this time, the rotary blade It can come into contact with blade X. At the same time as this contact, the bag member 205 immediately breaks, and the sheet member 201 begins to become entangled with the rotary blade X. It is conceivable that the sheet member 201 becomes entwined with the rotary blade X while being unfolded from a U- or V-shaped folded position. Then, as shown in FIG. 25, while the sheet member 201 is entangled with the rotary blade X, it is pulled out through the cut in the cylindrical member 202 before the cylindrical member 202 is completely cut. Then, as the sheet member 201 is pulled out to the outside and becomes entangled with the rotary blade Alternatively, it is possible to notice a change in the condition and prompt the road cutter to stop operating. Thereby, the operator can notice that the rotary blade X of the road cutter has entered the protected area of the underground object 22, and can avoid damage to the underground object 22.

Therefore, the buried object protector 200 of the present embodiment has the advantage of preventing the sheet member 201 from getting wet with water by the bag member 205 and the effect of the folded posture of the sheet member 201 inside the cylinder member 202, compared to the previous configuration. At least the function of protecting underground objects is demonstrated with higher precision.

(2) The structure of the cylindrical member of the buried object protector of the above embodiment is not limited to the above embodiment. For example, the cylindrical member of the buried object protection device of the present invention can be made of any combination such as a combination of a square inner shell member and a square outer shell member, a combination of a round inner shell member and a round outer shell member, etc. It may be selected from any shape and may take various forms in detail.

The buried object protector 300 in FIG. 26(a) includes a cylindrical member 302 consisting of a square inner shell member 303 and a square outer shell member 304. The sheet member 301 is housed inside the cylindrical member 302 in an unrestrained state. In the cylinder member 302, the inner shell member 303 and the outer shell member 304 are not connected to each other, and the inner shell member 303 is freely movable inside the outer shell member 304. The inner shell member 303 is placed on the bottom wall of the outer shell member 304. Due to the different cross-sectional dimensions of the inner shell member 303 and the outer shell member 304, when the buried object protector 300 is placed, there is a gap between the outer surface of the inner shell member 303 and the inner surface of the outer shell member 304 at the upper part of the buried object protector 300 when viewed in cross section. It is formed. In other words, a gap is formed between the outer surface of the inner shell member 303 and the inner surface of the outer shell member 304 on the outer surface of the inner shell member 303 facing the ground side. That is, the buried object protection device 300 can exhibit the function of protecting underground objects, as in the above embodiment, due to the void formed in a part of the circumferential direction. Note that the end of the cylindrical member 302 may be closed or open.

Further, the buried object protector 400 shown in FIG. 26(b) includes a cylindrical member 402 consisting of a triangular inner shell member 403 and a circular outer shell member 404. The sheet member 401 is housed inside the cylindrical member 402 in an unrestrained state. In the cylindrical member 402, each vertex of the triangle of the inner shell member 403 contacts the inner surface of the outer shell member 404, so that the inner shell member 403 and the outer shell member 404 are fixed to each other. A gap is formed between the outer surface of the inner shell member 403 and the inner surface of the outer shell member 404 at locations other than the contact points in the circumferential direction. That is, the buried object protection device 400 can perform the function of protecting underground objects, as in the above embodiment, due to the void formed in a part of the circumferential direction.

(3) The material of each component of the buried object protection device of the above embodiment is not limited to the above embodiment, and can be changed as long as it falls within the technical scope of the present invention.

(4) In the buried object protection device of the present invention, the bag member may be omitted. However, when the bag member is labor-saving, it is preferable that the internal space of the cylindrical member be kept watertight. This is to prevent the sheet member from deteriorating due to water intrusion, or to reduce the possibility that the sheet member will slip and become entangled with the rotary blade of the road cutter.

(5) In the buried object protector of the present invention, the sheet member does not need to be accommodated inside the cylindrical member in a substantially U-shaped or substantially V-shaped folded position. For example, the sheet member may extend linearly in cross-sectional view. Further, the display section may be omitted.

(6) In the installation structure of the above embodiment, the buried object protector or the buried object protection device is buried above the underground object and under the paving material, but the installation position of the buried object protector is not limited to this. . The buried object protection device or the buried object protection device may be installed on the ground side or above the underground object; for example, even if it is placed on the road surface, it can similarly protect the underground object from road cutters. It is possible.

(7) In the installation structure of the above embodiment, the underground object is a long body such as wiring or piping material, but its form is not limited to this embodiment. For example, the underground structure may be a casing-like underground structure that houses telecommunications equipment underground.

(8) In the buried object protector of the above embodiment, the display portion is formed on the outer surface of the closing portion of the closing member, but the present invention is not limited to the above embodiment. For example, the display section may be formed on the outer surface of the cylindrical member. Further, the display section is not limited to the arrow shape as in the above embodiment, but may take any form as long as it can visually display the orientation of the sheet member.

The present invention is not limited to the embodiments and modifications described above, but can be implemented in various forms within the technical scope of the present invention.

10 Buried object installation structure 11 Buried object protection device 12 Underground object 15 Road 16 Roadbed 17 Concrete section 18 Paving material 19 Backfill section 100 Buried object protection device 101 Sheet member 102 Cylindrical member 103 Inner shell member (cylindrical member)
104 Outer shell member (cylindrical member)
105 Bag member 106 Closing member 106a Closing part 106b First connecting part 106c Second connecting part 107 Display part 120 Substrate 121 Fixing hole 122 Connecting piece (connecting mechanism)
123 Locking groove (connection mechanism)
130 Fixing member 131 Support fitting 131a Support part 132b Fixing part 132 Bolt 133 Nut X Rotary blade of road cutter

Claims (16)

A buried object protection device for protecting underground objects from road cutters,
a sheet member configured to wrap around the rotary blade of the road cutter when it comes into contact with the rotary blade;
a hollow cylindrical inner shell member that accommodates the sheet member in an unrestricted state;
a rigid and hollow cylindrical outer shell member that accommodates the inner shell member therein;
A gap is formed between the outer surface of the inner shell member and the inner surface of the outer shell member in at least a portion of the circumferential direction of the inner shell member and the outer shell member,
A buried object protector characterized in that the inner shell member is made of synthetic resin, and the outer shell member is made of metal . A buried object protection device for protecting underground objects from road cutters,
a sheet member configured to wrap around the rotary blade of the road cutter when it comes into contact with the rotary blade;
a hollow cylindrical inner shell member that accommodates the sheet member in an unrestricted state;
a rigid and hollow cylindrical outer shell member that accommodates the inner shell member therein;
A gap is formed between the outer surface of the inner shell member and the inner surface of the outer shell member in at least a portion of the circumferential direction of the inner shell member and the outer shell member,
A buried object protector characterized in that the void is formed over the entire circumferential direction of the inner shell member and the outer shell member. A buried object protection device for protecting underground objects from road cutters,
a sheet member configured to wrap around the rotary blade of the road cutter when it comes into contact with the rotary blade;
a hollow cylindrical inner shell member that accommodates the sheet member in an unrestricted state;
a rigid and hollow cylindrical outer shell member that accommodates the inner shell member therein;
A gap is formed between the outer surface of the inner shell member and the inner surface of the outer shell member in at least a portion of the circumferential direction of the inner shell member and the outer shell member,
The end of the outer shell member is closed by a closure member, and the end of the inner shell member is supported by the closure member such that the outer surface of the inner shell member is separated from the inner surface of the outer shell member in the entire circumferential direction. Buried object protection equipment characterized by: A buried object protection device for protecting underground objects from road cutters,
a sheet member configured to wrap around the rotary blade of the road cutter when it comes into contact with the rotary blade;
a hollow cylindrical inner shell member that accommodates the sheet member in an unrestricted state;
a rigid and hollow cylindrical outer shell member that accommodates the inner shell member therein;
A gap is formed between the outer surface of the inner shell member and the inner surface of the outer shell member in at least a portion of the circumferential direction of the inner shell member and the outer shell member,
A buried object protector, wherein the inner shell member has a substantially circular cross-sectional shape, and the outer shell member has a substantially rectangular cross-sectional shape. A buried object protection device for protecting underground objects from road cutters,
a sheet member configured to wrap around the rotary blade of the road cutter when it comes into contact with the rotary blade;
a hollow cylindrical inner shell member that accommodates the sheet member in an unrestricted state;
a rigid and hollow cylindrical outer shell member that accommodates the inner shell member therein;
A gap is formed between the outer surface of the inner shell member and the inner surface of the outer shell member in at least a portion of the circumferential direction of the inner shell member and the outer shell member,
The buried object protection device is characterized in that the sheet member is folded into a substantially U-shape or a substantially V-shape in a cross-sectional view and accommodated in the inner shell member. The buried object protection device according to any one of claims 1 to 5, further comprising a waterproof or low water permeability bag member surrounding the sheet member. The buried object protector according to any one of claims 1 to 6 , wherein the outer shell member is thinner than the inner shell member. The buried object protector according to any one of claims 2 to 5 , wherein the inner shell member is made of synthetic resin, and the outer shell member is made of metal. 5. The sheet member according to claim 1, wherein the sheet member is folded into a substantially U-shape or a substantially V -shape when viewed in cross section and is housed in the inner shell member. Buried object protection equipment. A buried object protection device for protecting underground objects from road cutters,
a sheet member configured to wrap around the rotary blade of the road cutter when it comes into contact with the rotary blade;
a waterproof or low water permeability bag member surrounding the sheet member;
a cylindrical member that accommodates the sheet member in an unrestricted state;
The buried object protection device is characterized in that the sheet member is folded into a substantially U-shape or a substantially V-shape in a cross-sectional view and accommodated in the inner shell member. The buried object protector according to claim 5 , wherein the sheet member is held so as not to roll in the circumferential direction inside the inner shell member. The buried object protector according to any one of claims 5 and 9 to 11, further comprising a display section that externally displays the direction of the folded posture of the sheet member. A buried object protection device for protecting underground objects from road cutters,
a sheet member configured to wrap around the rotary blade of the road cutter when it comes into contact with the rotary blade;
a waterproof or low water permeability bag member surrounding the sheet member;
a hollow cylindrical inner shell member made of synthetic resin that accommodates the sheet member in an unrestricted state;
a rigid and hollow cylindrical metal outer shell member that accommodates the inner shell member therein;
The buried object protector is characterized in that the outer shell member is thinner than the inner shell member. An installation structure in which a buried object protection device is installed to protect underground objects from road cutters,
The buried object protection equipment is
a sheet member configured to wrap around the rotary blade of the road cutter when it comes into contact with the rotary blade;
a hollow cylindrical inner shell member that accommodates the sheet member in an unrestricted state;
a rigid and hollow cylindrical outer shell member that accommodates the inner shell member therein;
A gap is formed between the outer surface of the inner shell member and the inner surface of the outer shell member at least on the outer surface of the inner shell member facing the ground side ,
An installation structure characterized in that the inner shell member is made of synthetic resin, and the outer shell member is made of metal . An installation structure in which a buried object protection device is installed to protect underground objects from road cutters,
The buried object protection equipment is
a sheet member configured to wrap around the rotary blade of the road cutter when it comes into contact with the rotary blade;
a hollow cylindrical inner shell member that accommodates the sheet member in an unrestricted state;
a rigid and hollow cylindrical outer shell member that accommodates the inner shell member therein;
The sheet member is accommodated in the inner shell member by being bent into a substantially U-shape or a substantially V-shape in a cross-sectional view of the buried object protection device, and the sheet member has a substantially U-shape or a substantially V-shape. An installation structure characterized in that the open end of the is arranged so as to face the ground side. An installation structure in which a buried object protection device is installed to protect underground objects from road cutters,
The buried object protection equipment is
a sheet member configured to wrap around the rotary blade of the road cutter when it comes into contact with the rotary blade;
a waterproof or low water permeability bag member surrounding the sheet member;
a cylindrical member that accommodates the sheet member in an unrestricted state;
The sheet member is folded into a substantially U-shape or a substantially V-shape in a cross-sectional view of the buried object protector, and is accommodated in the cylinder member, and the sheet member is bent into a substantially U-shape or a substantially V-shape. An installation structure characterized in that the open end is arranged so as to face the ground side.

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