JP2021139226A - Exfoliation object fall prevention structure and construction method therefor - Google Patents

Abstract

To provide an exfoliation object fall prevention structure that can effectively suppress the sagging of a sheet.SOLUTION: An exfoliation object fall prevention structure 100 comprises a rectangular sheet 10 in which a first hole 11 is formed at least at four corners and a second hole 12 is formed at least at two opposing edges at intervals, a rope 20 for continuously inserting a plurality of second holes 12 formed at the edges of two opposing sides, a plurality of fixtures 30 fixed to a ceiling of a civil engineering structure, at least four first couplers 40 and 50, which are inserted through the first holes 11, respectively and connected to the fixtures 30, respectively, and second couplers 60 and 70 connected to the rope 20 and connected to the fixtures 30.SELECTED DRAWING: Figure 1

Description

The present invention relates to a structure for preventing a fallen object from falling from a ceiling such as a tunnel and a method for constructing the same.

The ceiling of tunnels for subways, railroads, vehicles, etc. consists of mortar, concrete, bricks, blocks, etc. It is necessary to prevent these exfoliated parts from falling inside the tunnel to ensure safety.

For example, if mortar is sprayed when repairing the ceiling of a tunnel while running on the subway, the mortar after construction may come off due to vibration caused by running on the subway. Therefore, measures are taken such as covering the construction surface of the mortar with a sheet to catch the peeled mortar so that the mortar does not come into contact with the subway even if the mortar is dropped.

Conventionally, such a sheet has a rectangular shape, and holes reinforced with eyelets or the like are formed at its four corners. Then, the seat is stretched on the ceiling portion by inserting and connecting the head portion of the anchor bolt driven into the ceiling portion by using a connecting tool such as a carabiner or a wire that inserts the hole.

Patent Document 1 discloses a technique in which a flexible surface material such as a net is stretched below a ceiling material suspended from a structure behind the ceiling to prevent the ceiling material from falling. The face material is stretched by being supported by a plurality of wires stretched in the short side direction at intervals in the long side direction. Both ends of each wire are fixed to a piece member that can be fixed by being fitted into a rail member installed facing the wall surface of the structure by using a turnbuckle.

Japanese Unexamined Patent Publication No. 2016-169492

However, when the subway or the like runs at high speed directly under the seat in the tunnel, a strong wind blows toward the seat. Therefore, there is a risk that the seat may come into contact with the subway, etc., or fallen objects may fall into the tunnel due to the seat hanging down due to damage to the hole or connector of the sheet, disconnection by the connector, etc. rice field.

In view of the above points, it is an object of the present invention to provide a fall-prevention structure for falling objects and a method for constructing the same, which can effectively suppress the sagging of the sheet.

The exfoliated object fall prevention structure of the present invention has a rectangular shape in which a first hole is formed at least at four corners and a second hole is formed at least at two opposing edges at intervals. A sheet, a long insertion material for continuously inserting the plurality of second holes formed at the edges of the two opposing sides, and a plurality of fixings fixed to the ceiling of the civil engineering structure. A tool, at least four first connecting tools that are inserted through the first hole and connected to the fixing tool, and a second connecting tool that is connected to the insertion material and connected to the fixing tool. It is characterized by having an ingredient.

According to the falling object fall prevention structure of the present invention, the sheet can be prevented from hanging by directly connecting the sheet to the fixture by using the first connector, and the second connector is used. By connecting the sheet to the fixture via a long insertion material, it is possible to prevent the sheet from hanging down. As a result, even if one connection is released due to a strong wind or the like, there is a backup due to the other connection, so that it is possible to effectively prevent the sheet from hanging down.

In the exfoliated object fall prevention structure of the present invention, the fixture is connected to the first fixture to be connected to the first connector and the second connector to be connected to the first fixture. It preferably consists of a different second fixture.

In this case, in connecting the sheets using the first and second connecting tools, it becomes easy to arrange the first and second fixing tools at appropriate positions, respectively. As a result, it becomes possible to make the pulling condition of the sheets to be connected using the first and second connecting tools appropriate.

Further, in the falling object fall prevention structure of the present invention, it is also preferable that the fixture is connected to the first connector and also to the second connector.

In this case, it is possible to reduce the number of fixtures.

Further, in the exfoliated object fall prevention structure of the present invention, the second hole is formed at the edges of the four sides of the sheet at intervals, and the insertion material is inserted through all the second holes. Is preferable.

In this case, in order to fix the insertion material through which all the second holes formed at the edges of the four sides of the sheet are inserted to the fixing tool via the first connecting tool, the sheet is held over the entire circumference. Therefore, it is possible to suppress the partial sagging of the sheet.

Further, in the falling object fall prevention structure of the present invention, the first connecting tool is the third connecting tool and the first connecting tool whose distance when connecting the first hole and the fixing tool cannot be adjusted. It is preferable that the hole is composed of a fourth connecting tool whose distance when connecting the fixing tool is adjustable.

In this case, since the connecting work by the operator is generally simple for the third connecting tool whose distance cannot be adjusted when connecting, it is possible to simplify the connecting work. Further, since the distance at the time of connecting the fourth connecting tool can be adjusted, it is possible to make the pulling condition of the seat appropriate.

Further, in the exfoliated object fall prevention structure of the present invention, among the second holes formed at the edges of the respective sides, the second holes located at the ends of the respective sides are the same as the first holes. It is preferably formed at close positions.

In this case, since each side of the sheet can be held by the insertion material over a long distance, it is possible to suppress partial sagging of each side of the sheet.

Further, in the exfoliated object fall prevention structure of the present invention, the adjacent intervals of the plurality of second holes formed on the edges of the two opposing sides are different, and the adjacent intervals are wide. It is preferable that the insertion material is located on the lower side of the sheet between the holes, and the insertion material is located on the upper side of the sheet between the second holes having a wide adjacent interval.

In this case, since the insertion material is located on the lower side of the sheet between the second holes having a wide adjacent interval, it is possible to suppress the sagging of the sheet. It should be noted that whether the adjacent spacing of the second holes is narrow or wide is relative, and whether the insertion material is located on the upper side or the lower side of the sheet with respect to all the adjacent spacing is the above-mentioned relationship. It doesn't have to be.

In the method for constructing the fall-prevention structure for exfoliated objects of the present invention, first holes are formed at least at the four corners and second holes are formed at least at two opposite edges at intervals. A step of preparing a rectangular sheet, a step of inserting a long insertion material continuously into each of the plurality of second holes formed at the edges of the two opposing sides, and a civil engineering structure. A step of fixing a plurality of fixtures to the ceiling portion, a step of inserting at least four first connectors into the first holes, and connecting the second connector to the fixtures, respectively. It is characterized by comprising a step of connecting to the insertion material and connecting to the fixture.

According to the method for constructing the fall-prevention structure for falling objects of the present invention, the sheet can be prevented from hanging down by directly connecting the sheet to the fixture using the first connector, and the second connector can be connected. By connecting the sheet to the fixture with a tool via a long insertion material, it is possible to prevent the sheet from hanging down. As a result, even if one connection is released due to a strong wind or the like, there is a backup due to the other connection, so that it is possible to prevent the sheet from hanging down.

The schematic view which looked at the falling object fall prevention structure which concerns on embodiment of this invention from the bottom. FIG. 1 is an enlarged schematic view of part A in FIG. FIG. 1 is an enlarged schematic view of part B in FIG. The schematic view which looked at the falling object fall prevention structure which concerns on the modification of embodiment of this invention from the bottom. FIG. 4 is an enlarged schematic view of part C in FIG. The flowchart of the method of constructing the falling object fall prevention structure which concerns on embodiment of this invention.

The exfoliated object fall prevention structure 100 according to the embodiment of the present invention will be described with reference to FIGS. 1 to 3.

The fall-prevention structure 100 ensures the safety inside the tunnel by preventing the fall-off material from falling into the tunnel from the ceiling Å of the tunnel for subways, railways, vehicles, and the like. The tunnel ceiling Å consists of mortar, concrete, bricks, blocks, etc.

In the following, the case where the ceiling of the tunnel is made of mortar and it is intended to prevent the mortar from falling into the tunnel after spraying the mortar to repair this ceiling Å is taken as an example. I will explain it by listing it. However, the application of the exfoliated object fall prevention structure 100 is not limited to this. Further, the exfoliated object fall prevention structure 100 may be used permanently or for a long period of time with replacement of the sheet 10 and the like described later.

The fall-off prevention structure 100 is attached to a rectangular sheet 10, a rope 20, a fixture 30 fixed to the ceiling A, connecting tools 40 and 50 connecting the sheet 10 and the fixture 30, and the sheet 10. The connecting tools 60 and 70 for connecting the rope 20 and the fixing tool 30 are provided. Here, the rope 20 corresponds to the long insertion material of the present invention, the connecting tools 40 and 50 correspond to the first connecting tool of the present invention, and the connecting tools 60 and 70 correspond to the second connecting tool of the present invention. Corresponds to.

The sheet 10 has a rectangular shape, and here, it has a rectangular shape having a long side and a short side, but it may have a square shape. The size of the sheet 10 may be such that it can sufficiently cover the area where the mortar is sprayed. Further, when such a range cannot be sufficiently covered by one sheet 10, a plurality of exfoliated object fall prevention structures 100 may be installed so that the sheets 10 are adjacent to each other.

The sheet 10 is made of a robust material that can reliably support falling objects such as mortar peeled off from the tunnel ceiling A and is not damaged by strong winds or temperature changes in the tunnel. There is. The sheet 10 may be a mesh sheet having a mesh (mesh) or a sheet without a mesh, and the material thereof may be a woven fabric, a resin, or a laminated product thereof. The sheet 10 may be formed using, for example, a fabric used as a soundproof sheet, a disaster prevention sheet, a curing sheet, or the like at a construction site or the like.

The sheet 10 is formed with a first hole 11 at each of its four corners. Each of these first holes 11 is reinforced by reinforcing tools 12 such as eyelets, grommets, and eyelets. Although not shown, the first hole 11 may be formed on the edge portion on the long side side of the sheet 10 and also on the edge portion on the short side side.

Further, in the sheet 10, a pair of second holes 13 formed at narrow intervals are continuously formed at the edges on each side of the long side and the short side at wide intervals. .. Further, here, the sheet 10 is formed with a pair of second holes 13 at four corners. Each of these pairs of second holes 13 is formed so as to be close to the first hole 11 and to sandwich the first hole 11 in between. The second hole 13 is also reinforced by a reinforcing tool 14 such as an eyelet, a grommet, or an eyelet.

It is preferable that the edge portion of each side of the sheet 10 is folded back to reinforce it as double or triple layers, and holes 11 and 13 reinforced by the reinforcing tools 12 and 14 are formed in the folded portion.

The rope 20 has a diameter capable of inserting the second hole 13. A string, wire, or the like may be used instead of the rope 20. The rope 20 has flexibility that allows it to pass through the second hole 13 continuously and pass above and below the sheet 10, and has sufficient strength not to be damaged even if the sheet 10 is fanned by a strong wind or the like. ing. The rope 20 is preferably, for example, a rope made of synthetic fibers such as vinylon such as Cremona (registered trademark), particularly a rope formed by twisting a plurality of ropes.

The rope 20 is provided along the upper surface of the sheet 10 between the pair of second holes 13 having a narrow adjacent spacing, and the sheet 10 between the second holes 13 having a wide adjacent spacing. It is located along the bottom surface. As a result, the lower surface of the seat 10 can be supported by the rope 20 over a long distance, so that the sagging of the seat 10 can be effectively suppressed. However, the present invention is not limited to this, and for example, even if the intervals between the second holes 13 are all the same and the ropes 10 having the same length pass through the upper side and the lower side of the sheet 10. good.

Here, the rope 20 inserts all the second holes 13 formed at the edges of the four sides of the sheet 10. The rope 20 is formed in an annular shape by connecting both ends of one rope by wrapping vinyl tape or the like.

In the fixture 30 fixed to the ceiling portion A, the head portion 31 is an eye-shaped (annular) or hook-shaped anchor bolt. However, the fixture 30 may not have a bolt portion as long as it is fixed to the ceiling portion A, and further, when the structure is fixed to the ceiling portion A, this structure It may be fixed to.

The fixture 30 is fixed to the ceiling portion A at a position corresponding to the position of the first hole 11 formed at the four corners of the seat 10. Specifically, the fixture 30 is located outside each of the first holes 11 so that the head portion 31 projects downward slightly outside the corner of the seat 10, and the circular opening of the head portion 31. Is fixed so as to face the corner of the sheet 10.

The fixture 30 is selected so that the bolt portion is driven deeper than a predetermined depth into the sound portion of the mortar of the ceiling portion A. For example, since all the parts of the mortar that are not repaired are healthy parts, the bolts of the fixture 30 that are driven into the mortar parts that are not repaired are shortened, and the parts of the repaired mortar are driven into the repaired mortar part because the starting position of the healthy parts is deep. The bolt portion of the fixture 30 may be lengthened.

The connecting tools 40 and 50 connect the seat 10 and the fixing tool 30. Here, the connecting tools 40 and 50 connect the seat 10 and the fixing tool 30 by inserting the first hole 11 and the head portion 31 of the anchor bolt 30.

The connecting tools 60 and 70 connect the rope 20 through which the second hole 12 of the sheet 10 is inserted and the fixing tool 30. Here, the connecting tools 60 and 70 are annularly formed so that the rope 20 enters the inside, and the head portion 31 of the anchor bolt 30 is inserted to connect the seat 10 and the fixing tool 30 via the rope 20.

The connecting tools 40 and 50 determine the distance when connecting the first hole 11 and the fixing tool 30 to the connecting tool 40 whose distance cannot be adjusted when connecting the first hole 11 and the fixing tool 30. It comprises an adjustable connector 50. The connecting tools 60 and 70 are a connecting tool 60 in which the distance when connecting the rope 20 and the fixing tool 30 cannot be adjusted, and a connecting tool 50 in which the distance when connecting the rope 20 and the fixing tool 30 can be adjusted. It consists of. The connecting tools 40, 50, 60, and 70 may be used properly according to the connecting order and the like as described later.

The connecting tools 40 and 60 are made of, for example, a metal such as a carabiner or a nascan, and commercially available products can be used. The connectors 40 and 60 have a ring shape as a whole, and are provided with a gate capable of opening and closing this ring shape. As the gate, a known gate such as a straight gate, a bent gate, or a wire gate may be used. The connectors 40 and 60 may be the same, the same type, or different.

The connecting tools 40 and 60 have a hook shape when the gate is open, and the opening of the first hole 11 or the annular rope 20 and the head portion 31 of the fixing tool 30 can be inserted. Then, when the operator closes the gate, the first hole 11 or the rope 20 and the fixing tool 30 are connected by the connecting tools 40 and 60. At this time, the movable range of the sheet 11 in the portion of the first hole 11 or the rope 20 connected to the connecting tools 40 and 60 is within the range of the ring-shaped opening of the connecting tools 40 and 60.

The couplers 50 and 70 have long flexibility made of, for example, a metal such as a wire, a rope, a string, or a wire, or a resin, and commercially available products can be used. The connecting tools 50 and 70 may have elasticity in the long direction, but it is preferable that the connecting tools 50 and 70 do not have such elasticity. The connectors 50 and 70 may be the same, the same type, or different. Then, a plurality of wires, ropes, or the like may be used as the connecting tools 50, 70 at one connecting point.

The operator inserts the opening of the head portion 31 of the fixture 30 and then inserts the first hole 11 or the rope 20 so as to enter the inside of the connector 50, 70 so as to form an annular shape. By connecting both ends to each other, the first hole 11 or the rope 20 and the fixing tool 30 are connected by the connecting tools 50 and 70. At this time, the movable range of the first hole 11 or the rope 20 connected to the connecting tools 50 and 70 is within the range of the ring-shaped opening when the connecting tools 50 are connected.

Here, in the holes 11 and 12 formed at the two corners located at both ends of one short side of the sheet 10, the sheet 10 is connected to the fixing tool 30 by the connecting tools 40 and 60. .. Then, in the holes 11 and 12 formed at the two corners located at both ends of the other short side of the sheet 10, the sheet 10 is connected to the fixing tool 30 by the connecting tools 50 and 70 via the rope 20. Has been done.

As a result, the work can be easily connected by the connecting tools 40 and 60 at two places, and the degree of connection can be adjusted by the connecting tools 50 and 70 at two places or an error in the driving position of the fixing tool 30. It is possible to easily make adjustments due to the above. It is preferable that the connection by the connecting tools 50 and 70 is performed after the connection by the connecting tools 40 and 60. The selection of the connecting tools 40, 50, 60, 70 is not limited to those described above, and all of them may be connected by the connecting tools 40, 60 or the connecting tools 50, 70, for example.

The rope 20 through which the second holes 12 are formed at the four corners of the sheet 10 passes above the sheet 10 between the second holes 12. Therefore, it is preferable that the connecting tools 60 and 70 connected to the rope 20 in this portion are located above the connecting tools 40 and 50.

As described above, the sheet 10 can be prevented from hanging down by directly connecting the sheet 10 to the fixing tool 30 by using the connecting tools 40 and 60, and the sheet 10 can be prevented by using the connecting tools 50 and 70. Can be prevented from hanging down by connecting the seat 10 to the fixture 30 via the rope 20. As a result, even if one of the connections is released due to a strong wind or the like, there is a backup due to the other connection, so that it is possible to effectively prevent the sheet 10 from hanging down.

Further, it is preferable that the degree of the connection margin (the degree of pulling of the sheet 10) is different between the connection using the connecting tools 40 and 60 and the connecting using the connecting tools 50 and 70. This is because when a large force that causes the seat 10 to hang down is applied, both connections may be released at almost the same time. However, the degree of margin for connection may be the same. Also in this case, it is possible to prevent the sheet 10 from hanging down even if a larger force is applied to the sheet 10 as compared with the conventional case. It should also be noted that the margin for these connections is such that the central portion of the seat 10 does not hang down significantly.

As for the order of work between the connection using the connecting tools 40 and 60 and the connection using the connecting tools 50 and 70, when attaching the sheet 10, the sheet 10 is attached first with the smaller degree of connection margin. When removing it, it is preferable to first perform the one with a larger degree of connection margin.

Hereinafter, the exfoliated object fall prevention structure 200 according to the modified example of the embodiment of the present invention will be described with reference to FIGS. 4 and 5. Since the exfoliated object fall prevention structure 200 is similar to the exfoliated object fall prevention structure 100 described above, only the differences will be described.

The exfoliated object fall prevention structure 200 is attached to a rectangular sheet 110, a rope 120, a fixture 30 fixed to the ceiling portion A, connecting tools 40 and 50 connecting the sheet 110 and the fixture 30, and the sheet 110. A connecting tool 70 for connecting the rope 120 and the fixing tool 30 is provided.

The sheet 110 has a second hole 13 formed at the edge on each side of the long side, but unlike the sheet 10, the second hole 13 is formed at the edge on each side of the short side. Not formed.

The rope 120 has the same structure as the rope 20, but has two ropes, each of which is inserted through all the second holes 13 formed at the edges of the long sides of the sheet 110. Each rope 120 is configured so as not to come out of the inserted second hole 13 by forming a knot at both ends or wrapping a vinyl tape.

The fixture 30 has a pair of second holes formed near the center of each long side of the seat 110, in addition to the positions corresponding to the positions of the first holes 11 formed at the four corners of the seat 110. It is fixed to the ceiling portion A at a position corresponding to 12.

The connecting tools 40 and 50 are the same as the above-mentioned exfoliated object fall prevention structure 100, and connect the sheet 110 and the fixing tool 30. Here, the connecting tools 40 and 50 connect the seat 10 and the fixing tool 30 by inserting the first hole 11 and the head portion 31 of the anchor bolt 30.

The connecting tool 70 connects the two ropes 120 through which the second hole 12 of the seat 110 is inserted and the fixing tool 30 located near the central portion of the long side of the seat 110, respectively. Here, the connecting tool 70 is annular so that the rope 120 enters between the pair of second holes 12 located near the central portion of the long side of the seat 110, and the head portion 31 of the fixing tool 30. The seat 110, the fixture 30, and the rope 120 are connected to each other via the rope 120.

In this way, in the first holes 11 formed at the two corners located at both ends of one short side of the sheet 110, the sheet 110 is connected to the fixture 30 by the connector 40. There is. Then, in the first holes 11 formed at the two corners located at both ends of the other short side of the sheet 110, the connecting tool 50 is located near the center of the long side of the sheet 110. Between the pair of second holes 12, the sheet 10 is connected to the fixture 30 by a connector 50 via a rope 20. The fixture 30 corresponds to the second fixture of the present invention.

As a result, it is possible to easily connect the work with the connecting tools 40 and 60 at two places, and at four places it is caused by the adjustment of the degree of connection by the connecting tool 70 or the error of the driving position of the fixing tool 30. It is possible to easily make adjustments. It is preferable that the connection by the connecting tool 70 is performed after the connection by the connecting tools 40 and 60 at two places.

As described above, the seat 110 can be prevented from hanging down by directly connecting the seat 110 to the fixture 30 by using the connecting tools 40 and 60, and the seat 110 is fixed by using the connecting tool 70. By connecting to the tool 30 via the rope 20, it is possible to prevent the sheet 110 from hanging down. As a result, even if one connection is released due to a strong wind or the like, there is a backup due to the other connection, so that it is possible to effectively prevent the sheet 110 from hanging down.

Although not shown, a second hole 13 is also formed at the edge of the short side of the sheet 110 on each side, and the rope 120 is inserted through all the second holes 13 formed on each short side. Each of these ropes 120 may be connected to the fixture 30 driven into the ceiling A near the center of the short side of the seat 110 by the connector 70.

Further, the substantially linear rope 120 through which the second holes 13 formed on each side of the sheet 110 are inserted is fixed to the fixture 30 located near the central portion of each side, but the present invention is limited to this. Not done. For example, the substantially linear rope 120 may be connected to a fixture 30 located outside the vicinity of the central portion of each side, or may be connected to the fixture 30 to which the couplers 40 and 50 are connected. Further, although not shown, an annular rope 20 through which the second hole 13 formed on all sides of the sheet 10 of the above-mentioned fall-prevention structure 100 is inserted is located near the center of each side of the sheet 10. It may be fixed to the fixture 30 to be used.

Further, when the exfoliated object fall prevention structure 200 is installed side by side in the extending direction of the short side, two fixtures 30 fixed to the ceiling portion A near the center of the adjacent long sides of the sheet 110 are provided to prevent the exfoliated object from falling. It is preferable to use it in common with the structure 200.

Hereinafter, a method of constructing the exfoliated object fall prevention structure 100 according to the embodiment of the present invention will be described with reference to FIGS. 1 to 3 and 6.

First, a sheet preparation step (S1) for preparing the sheet 10 is performed. Then, a rope insertion step (S2) is performed in which all the second holes 12 formed at the edges of each side of the sheet 10 are continuously inserted to insert one rope 20. After the rope 20 is inserted, the rope 20 is connected by tying both ends.

Further, a fixture fixing step (S3) for fixing the fixture 30 to the ceiling portion A of the civil engineering structure is performed. This fixture fixing step (S3) may be performed before or at the same time as the seat preparation step (S1) and the rope insertion step (S2).

After that, the four connecting tools 40 and 50 are inserted into the first holes 11 formed at the four corners of the sheet 10, respectively, and the first connecting step (S4) of connecting the four connecting tools 40 and 50 to the fixing tools 30 is performed.

Further, a second connecting step (S5) is performed in which the four connecting tools 60 and 70 are connected to the rope 20 and connected to the fixing tool 30, respectively. As described above, the exfoliated object fall prevention structure 100 is constructed. Either the first connecting step (S4) and the second connecting step (S5) may be performed first.

The present invention is not limited to the above-mentioned fall-prevention structures 100 and 200 and the method for constructing them, and can be appropriately modified. For example, a first hole 11 may be formed in addition to the four corners of the sheets 10 and 110, and the first hole 11 may be used to connect to the fixture 30. When the ropes 20 and 120 for inserting the second hole 12 are not connected to the fixture 30, the fixture 30 corresponds to the first fixture of the present invention.

Further, in order to prevent the sheets 10 and 110 from hanging down, a configuration other than that described may be added. For example, in order to prevent the central portion of the sheets 10 and 110 from hanging down, a rope may be stretched along the lower surface of the central portion of the sheets 10 and 110. Although the case where the shapes of the sheets 10 and 100 are rectangular has been described, it can be assumed that the sheets 10 and 100 have other shapes such as polygons such as triangles and pentagons, circles, and ellipses.

10, 110 ... Sheet, 11 ... 1st hole, 12, 14 ... Reinforcing tool, 13 ... 2nd hole, 20, 120 ... Rope (long insertion material), 30 ... Fixing tool (1st fixing tool) , 2nd fixture), 31 ... head part, 40 ... connector (first connector), 50 ... connector (first connector), 60 ... connector (second connector), 70 ... connecting tool (second connecting tool), 100, 200 ... falling object fall prevention structure, A ... tunnel ceiling.

Claims (8)

A rectangular sheet in which the first holes are formed at least at the four corners and the second holes are formed at least at the edges of the two opposite sides at intervals.
A long insertion material for continuously inserting the plurality of second holes formed at the edges of the two opposing sides, and a long insertion material.
Multiple fixtures that are fixed to the ceiling of civil engineering structures
With at least four first connecting tools, each of which is inserted through the first hole and is connected to the fixing tool, respectively.
A fall-prevention structure for falling objects, which comprises a second connecting tool that is connected to the insertion material and is connected to the fixing tool. The fixture comprises a first fixture that is connected to the first connector and a second fixture that is coupled to the second connector and is different from the first fixture. The fall-prevention structure for falling objects according to claim 1. The fall-prevention structure according to claim 1, wherein the fixture is connected to the first connector and is also connected to the second connector. The second hole is formed at the edges of the four sides of the sheet at intervals, and the insertion material is inserted into all the second holes, according to claims 1 to 3. The exfoliated object fall prevention structure according to any one item. The first connecting tool is used when connecting the first hole and the fixing tool to a third connecting tool whose distance cannot be adjusted when connecting the first hole and the fixing tool. The fall-prevention structure according to any one of claims 1 to 4, further comprising a fourth connecting tool whose distance can be adjusted. Among the second holes formed at the edges of the respective sides, the second hole located at the end of each side is characterized in that the second hole is formed at a position close to the first hole. The fall-prevention structure according to any one of claims 1 to 5. The adjacent intervals of the plurality of second holes formed on the edges of the two opposing sides are different, and the second holes having a wide adjacent interval are located on the lower side of the sheet. The one according to any one of claims 1 to 6, wherein the insertion material is located and the insertion material is located on the upper side of the sheet between the second holes having a wide adjacent interval. Falling prevention structure. A step of preparing a rectangular sheet in which a first hole is formed at least at four corners and a second hole is formed at least at two opposite edges at intervals.
A step of inserting a long insertion material into the plurality of second holes formed at the edges of the two opposing sides in succession to each other.
The process of fixing multiple fixtures to the ceiling of a civil engineering structure,
A step of inserting at least four first connecting tools through the first holes and connecting them to the fixing tools, respectively.
A method for constructing a falling object fall prevention structure, which comprises a step of connecting the second connecting tool to the insertion material and connecting to the fixing tool.

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